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Патент USA US3054873

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Sept. 18, 1962
M. MOLLOY ETAL
3,054,363?
MAGNETIC FEEDBACK SUPPRESSION BETWEEN BATTERY-CELL
AND A TRANSISTOR AMPLIFIER
Filed April 28, 1960
TRANSISTOR
\AMPLlFlER
.
'1
\\
VIIIIIIII lI'IIifIlIII/Ill
V“I\ \‘
//VVENO.~‘?5
M.Molloy
Z. Shobod
ATTORNEYS
United grates Patent Q
1
lC€
3,054,863
Patented Sept. 18, 1952
2
FIG. 1-A is a diagrammatic view of the battery sec
3,054,863
MAGNETIC FEEDBACK SUPPRESSION BETWEEN
BATTERY-CELL AND A TRANSISTOR AMPLI
FER
Martin Molloy, Croton-on-Hudson, and Zygmund Sha
had, New York, N .Y., assignors to Souotone Corpora
tion, Elmsford, N.Y., a corporation of New York
Filed Apr. 28, 1960, den No. 25,333
10 Claims. (Cl. 179-107)
tion of the ampli?er unit of FIG. 1;
PEG. 2 is a transverse cross-sectional view of the struc
ture of the battery section of FIG. 1, with the battery
cells removed from their operative positions;
FIG. 3 is a cross-sectional view along line 3-3 of FIG.
2; and
FIGS. 4 and 5 are views similar to FIG. 1, of di?er
ent battery sections and of the adjoining ampli?er section
10 of such ampli?er unit, whereby the same ampli?er sec—
This invention relates to compact transistor-ampli?er
tion is energized with successively smaller numbers of
units, such ‘as hearing aids, and more particularly to bat
serially connected battery cells for operation with the
tery units forming part thereof ‘and supplying operating
desired selected smaller gain and power output.
FIG. 1 shows one form of a hearing aid exemplyifying
_
.
Transistor-ampli?er hearing aids usually combine in a 15 the invention. It comprises a transistor ampli?er unit 10
compact, miniature-size unit, a signal pickup device with
all elements of which are enclosed in a ?at, miniature
current thereto.
a ferromagnetic transducer core and core winding, and
transistor~amplier means with a plurality of transistor
stages energized by one or more battery cells for ampli
fying the signal currents of the pickup device and supply
ing the ampli?ed currents to an output device, such as a
receiver carried on the head of the user for delivering cor
size ampli?er casing 11. Within the ampli?er casing 11
are shown suitably supported one or two selectively used
signal pickup devices 12, 14, ‘and a transistor ampli?er 21
having several transistor ampli?er stages for amplifying
the signal current supplied by one of the pickup devices
12, 14 and delivering the ampli?ed signal currents to am
responding ampli?ed sound to his hearing organs.
plier output terminals 26 which are connected through a
The present invention takes ‘advantage of the fact that
thin, ?exible multi-conductor cord 37 to an output device
a transistor-ampli?er unit of given amplifying character 25 or receiver 38, such ‘as an ear phone held in the ear of
istics will operate with a larger or smaller ampli?er gain
the user, or a bone-receiver worn against a bony part of
the user’s head.
and power output depending on the number of battery
cells connected in series for supplying operating cur
One of the selectively used signal pickup devices, for
rent to the transistor-ampli?er. In accordance with the
instance pickup device 12, may be an electromagnetic
microphone, for instance of the type described in Pearson
invention, a transistor~ampli?er means of such compact
ampli?er unit is arranged for interchangeable operation
Patent 2,927,976, which picks up and transduces propa
with an associated battery structure containing a larger
gated sound into corresponding signal currents, and has a
or smaller number of similar serially-connected, detach
term-magnetic core surrounded by pickup windings 13.
ably mounted battery cells, depending on the hearing
The other signal pickup device 14 likewise has a ferro
needs of the user.
magnetic core surrounded by pickup windings 15 arranged
As an example, a commercial ‘form of hearing aid of
so that when placed adjacent the receiver of a conven
the invention is designed for combination with battery
units containing either four, three or two battery cells,
or only one battery cell, thereby assuring that the user
does not have di?iculty in replacing the individual battery
cells with their polarity properly aligned therein. In ac
tional telephone, it will pick up by magnetic induction, sig
cordance with the invention, all battery cells of such am
nals corresponding to the voice currents in such telephone
receiver, as described, for instance, in Patent 2,441,840.
The microphone 12 may be positioned with its diaphragm
close to a casing opening 12—1 of the ampli?er unit. The
telephone pickup device 14 has its core positioned within
pli?er unit are detachably held with their longitudinal
casing 11 in a conventional way, so that on placing one of
aXis parallel and with alike poles vadjacent to each other.
its ?at casing walls over the receiver diaphragm of a con
45
The relatively large cell current ?owing through each of
ventional telephone pickup winding 15, it will. be magneti
the serially-connected battery cells in the same parallel
cally interlinked with the windings of the telephone re
direction, induces a magnetic ?eld, and the magnetic ?elds
ceiver and have induced in its windings 15 corresponding
of the several individual cell currents produce a magnetic
voice currents. The selector switch 16 operated by grip
leakage feedback vwith the core and windings of the pickup
16-1 exposed on the exterior of casing 11, serves to selec
structure, thereby distorting its signal currents. Accord 50 tively connect either microphone Winding through input
ing to the invention, the connector conductors by means
leads to the input stage of the transistor ampli?er 21. The
of which the paralleharr-anged and serially-connected bat
receiver 38 is likewise of the electromagnetic type, such as
tery cells are connected serially with each other and to
described, for instance, in Pearson Patent 2,493,734, and
the transistor-ampli?er, are arranged and placed so as to
has a ferromagnetic core surrounded by transducer wind
provide at least one connector conductor in close prox 55 ings 39.
imity and along each battery cell, which passes current in
The transistor ampli?er 21 may be of any of the known
the direction opposite to the cell current of its respective
audio-frequency transistor ampli?ers having, for instance,
cell and thereby produces 1a magnetic ?eld opposite to and
two or more gain stages with a transistor in each gain
neutralizing the disturbing effect ‘of the magnetic ?eld pro
stage,
and an output stage with a single power output
60
duced by the respective cell cur-rents.
transistor or with a push-pull output stage having two
Although the principles of the invention are applicable
push-pull-connected output transistors. As an example,
to other types of compact, portable audio-frequency am
it may be of the type described in Patent 2,927,276, with
pli?er units, for instance, to miniature-size tape recorders,
a single output transistor, or modi?ed, for instance, in
they will be described herein in connection with a minia
the manner described in any one of Patents 2,847,519;
ture-size hearing aid worn hidden on the body of the user. 65 2,866,193; 2,887,540; 2,896,029, to operate with two push
The foregoing ‘and other objects of the invention will
be best understood from the ‘following description of ex
empli?cations thereof, reference being had to the accom
pull-connected transistors for delivering push-pull ampli
?ed signal output to the windings 39 of the receiver or out
put device 38. The transistor ampli?er 21 shown, has such
panying drawings, wherein:
push-pull output stage operating with two push-pull-con
greatly exaggerated in size, a miniature-size hearing-aid
ampli?er unit exemplifying one vform of the invention;
ter and collector, shown by conventional symbols. Al
though the transistors 24 shown are of the PNP type, they
FIG. 1 shows in a partially diagrammatic way and 70 nected junction transistors 24 each having a base, an emit
3,054,863
3
may be of opposite conductivity, in which case the polarity
of the associated direct-current circuits is reversed.
The ampli?ed signal output of a next-preceding transis
4%
1-8 to 4-8, of the ampli?er casing 11, has a resiliently
flexible metallic spring projection biased to establish good
contact engagement with the respective battery connector
tor ampli?er stage, which may likewise operate with two
terminals 1-P to 4-P of the battery unit, when the two
push-pull-connected transistors, is impressed in push-pull
metallic casings 11 and 51 are joined or assembled or
through the two base leads 22 and a common emitter
lead 23 between the base and emitter of the two push
partially diagrammatically in FIG. 1. Although the prin
pull-connected output transistors 24. The electrodes of
the two push-pull output transistors 24 are maintained at
ciples of the invention are described herein in connection
with an ampli?er unit 1%) and a battery unit 51) having
collector-bias leads 25 to D.C. biasing circuits or" the tran
casings may be formed of insulating plastic or resin ma
af?xed into an integral ampli?er-battery unit, as shown
the proper DC. bias by connecting their collectors through 10 internesting metallic casings 11 and 51, respectively, their
terial, in which case provision is made that their ground
ed circuit portions are automatically connected, as by
another pair of interconnecting terminals similar to ter
tor output leads 26 from the collectors of the two output
transistors 24 by way of two conductors of the ?exible 15 minals 1—P and 1-8, just described.
As stated before, in accordance with the invention,
connector cord 37 to end terminals of the windings 39‘
sistor ampli?er 21. The ampli?ed push-pull signal cur
rent output is delivered in push-pull through two collec
provision is made to assure that the user has no dif?culty
of the output device or receiver 38.
in replacing ‘with a fresh battery cell, an exhausted bat
The push-pull circuit from the collectors of the two
tery cell or several exhausted battery cells 52 to 55 of
output transistors 24 to the receiver windings 39 is com
pleted on one side by connecting their common emitter 20 the battery unit 50. To this end, each of the set of elon
gated battery cells 52 to 55 has alike poles oriented in
lead 23 through a ground lead 28 to the casing 11 of the
the same direction when they are operatively held or
ampli?er unit, which constitutes a ground, as indicated by
ground symbol 29. The other side of the push-pull out
put circuit is completed by connecting an intermediate or
midpoint of transducer output winding 39 through the
third conductor of a ?exible connector cord 37, by way
of ampli?er conductor 32 and the DC. supply circuit of
battery section 50 of the ampli?er unit to its casing 51,
which forms a circuit ground, as indicated by ground sym
bol 29. For the purposes of this application, it is as
sumed that the casing 11 of the ampli?er unit and the cas
ing 51 of its battery section are of metal, and that the
two metallic casings 11, 51 are in electrical contact en
gagement with each other and form a common circuit
ground for the ampli?er circuits and the battery section
519 of the transistor ampli?er 21.
In accordance with the invention, instead of operating
the hearing-aid ampli?er unit 19 of the type shown, with
a battery unit formed of one or several structurally united
battery cells arranged for replaceable positioning in the
casing 11 of the ampli?er unit 10, the transistor ampli?er
unit 10 is arranged for detachable cooperation with dif
ferent separable battery units or sections, each of the
different cooperating battery sections being arranged to
positioned ‘within the battery casing 51. By way of ex—
ample as seen in FIG. 1, each of the elongated battery
cells 52 to 55 is of the conventional type, having its me
tallic positive pole exposed at its right end, and its op
posite metallic negative pole exposed at its left side. In
the form in which they are generally available for sale,
each such elongated battery cell is coated on its cylin
drical exterior with a ?lm of insulating material, such as
a plastic ?lm, having an exposed, visible legend, such
‘as an arrow, marked with a plus (+) sign, indicating
the positive terminal or pole of the respective battery cell,
which assures easy identi?cation of the positive pole end
thereof.
Each such battery cell 52 tov 55 is arranged to
be replaceably held and restrained in a predetermined
cell position within the battery casing 51, by detachable
engagement of its respective opposite cell poles with a
distinct pair of metallic battery terminals 61, 62 insulat
ingly mounted as relatively ?xed parts of the battery cas
ing 51. In FIG. 1, each pair of battery terminals 61, 62
has one battery terminal, for instance battery terminal
62, which engages the positive pole of the respective cells
52 to 55 with a plus (+) sign, and each opposite battery
replaceably hold a larger or smaller number of battery 45 terminal 61 shown marked with a minus i(——) sign. In
cells parallel to each other, with their alike battery poles
oriented in the same direction. In other words, in accord
ance with the invention, the transistor-ampli?er hearing
aid unit 10 of the type described above, is combined with
one of a series of di?erent battery units containing larger
or smaller numbers of battery cells for causing the tran
sistor-ampli?er 21 of the ampli?er unit 10‘ to operate with
a larger or smaller amplifying gain and power, depending
on the needs of the user.
the commercial for of battery casing 51 shown, the in
terior ‘bottom surface of the battery casing 51 underlying
the array of elongated battery cells 52 to 55, has on the
inward bottom surface of each cell compartment a mi
nutely thin imprinted label, for instance of insulating
plastic material, imprinted with an arrow and a plus
(+) sign, which instructs the user that a replacement
cell should be inse?ed into the respective cell compart
ments of the battery casing 51 with the correspondingly
FIG. 1 shows, by way of example, the battery section 55 oriented plus (+) sign cell polarity.
The metallic connector terminals 1-P, 2-P, 3-? and
4-1’ and the opposite-polarity terminals 61, 62 of each
cell compartment of battery casing 51, are interconnected
to each other by a series of relatively insulated conduc
user, and detachably holding four alike battery cells 52,
53, 54, 55, indicated by the conventional battery cell 60 tors 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, and
to the casing 51 with its ground 29, in such manner that
symbol. As indicated diagrammatically, each battery cell
or unit 50 arranged for detachable interconnection with
the ampli?er unit 10 into a miniature-size, integral struc
ture small enough for hidden wear on the body of the
52—55 forms an elongated unit with an elongated casing
all battery cells 52 to 5.5 are serially connected to the
transistor ampli?er 21 of the ampli?er unit 10, and that
56, having exposed opposite-polarity cell poles on its
at least some of the battery cells 52 to 55 are properly
small opposite ends, and they are detachably held in the
battery unit 50 parallel and adjacent to each other and 65 connected to the biasing circuits of the transistor ampli
?er 21.
The ampli?er unit 10 has an energizing switch 81 of
the rotary type, for instance, with two interconnected
metallic switch arms arranged to engage two cooperat
spectively, arranged to automatically engage and make 70 ing contacts 82 for connecting or disconnecting the bat
tery cells 52 to 5'5 of the battery unit 50 to or from the
good electrical connection With a set of cooperating me
with alike poles oriented in the same direction.
The battery unit 50 and its metallic casing 51 has also
insulatingly mounted and carries thereon a set of metallic
battery connector terminals 1-P, 2-P, 3—~P, and 4—P, re
operating circuits of the transistor ampli?er 21 when
switch contacts 82 engage each other in the on-switch
respectively, insulatingly mounted in and carried by am
position, and to break the energizing connection when
pli?er casing 11. Each of one set of these metallic ter
minals, for instance the four metallic supply terminals 75 the switch arms 81 are moved to the off-position shown.
tallic ampli?er supply terminals 1-8, 2-5, 3-8 and 4—S,
5
3,054,863
The movable switch arms 81 are arranged to be moved
or rotated between the oti~position shown and the on
terminal of cell 53, through series resistance 87, the bat
tery connector terminal ‘3-1’ and ampli?er supply ter
position, by a control knob 84 rotatably carried by the
minal 3-S engaged thereby, ampli?er conductor 17 and
ampli?er casing 11. Control knob 84 has a knurled, pe—
transistor ampli?er stages preceding the output transistors
ripheral portion which is exposed on the exterior of am
24, return ampli?er conductor ?ll-Tr, closed ampli?er
pli?er casing 11, and its rotary motion is transmitted to
switch contacts 81, ‘82, ampli?er supply terminal 3-8 and
energizing switch 81 by conventional motion-transmitting
battery connector terminal 3-P engaged thereby, and bat
means, indicated by dash-dot line 85, which is also shown
tery conductors 77, 76, which complete the circuit con
connected to a movable or rotary tap arm 86 of a volume
nections of the two battery cells 52, 53 to the preceding
control resistance 87 of the transistor ampli?er 21, so 10 ampli?er stages of transistor ampli?er 21. It should be
that by moving the rheostat tap arm 86 to different posi
noted that all circuit conductors of the transistor ampli
tions along Volume control rheostat or resistance 87, the
gain and volume of sound ‘output are increased or de
creased. With this arrangement, the motion-transmitting
?er unit 10 and its battery unit 5% are assumed to be
provided with conventional insulatingly-coated conductor
wires.
connections of the movable switch arms 81 and movable 15
In accordance with the invention, the current-propor
tioning resistance 87 which is connected between the bat
tery connector terminals 3-1’, 4-P, is not embodied in
arranged
(for instance,
that in the
counterclockwise
initial movement
direction)
of the from
knob the
the circuit of the transistor ampli?er 21, but in the bat
otf~position in which it is seen in FIG. 1, the switch arms
tery unit 50, so that when operating with a battery unit
81 will ?rst be brought in contact engagement with con 20 5tl—-2 having only one cell, in the manner described
tacts 82 for thereby energizing the circuits of the tran
below in connection with FIG. 5, the three battery con
sistor ampli?er 21, and also bring the rheostat tap arm
nector terminals 2—P, 3—P and 4-P may be directly con~
36 into the initial tap position along volume control
nected to each other for operating the transistor ampli?er
87. In the further rotation of control knob 84 in the
21 with reduced gain and power output, in accordance
rheostat arm 86 to the rotary control knob 34 are so
same counterclockwise direction, the switch contacts 82 25 with the needs of the user.
remain closed, and only the rheostat tap arm 36 is moved
With the transistor ampli?er energized by closure of
to different portions along the volume control resistance
energizing switch contacts 81, 82 and volume control tap
87 for adjustably increasing the gain and power output
86 of resistance 87 set in the proper adjusted position by
of the transistor ampli?er and the level of the sound out
control knob 84, the signal output of either microphone
put delivered by receiver 38.
30 1'3, or, as shown, of the telephone pickup 14, is impressed
By turning the control knob 84 from the desired ad~
on the input side of the transistor ampli?er 21 which
justed volume control position, in reverse, clockwise di
will deliver a corresponding ampli?ed signal output in
rection, the volume of the sound output of the receiver
push-pull to the output winding 39 of the output device
38 is ?rst decreased until at the end of the clockwise rota
or receiver 33. By actuation of selector switch 16, as by
tion of control knob '84, it turns the energizing switch 35 its knob 1;6—1, into contact engagement with the oppo
arms ‘81 to disengage them from their switch contacts 32
site contacts, the winding of microphone 13 is connected
and bring them to the off-position shown. Since the de
to the input side of the ampli?er (instead of the telephone
tails of such controls are well known in the art, they do
pickup winding), and the signal output of the: microphone
not require further description.
corresponding to the sound propagated on the exterior of
In operation, assuming that clockwise rotation of con
the ampli?er unit 10 will be ampli?ed by the transistor
trol knob 84 from the position shown in FIG. 1, has
ampli?er 21 and impressed in push-pull on the output
brought switch arms 81 into engagement with switch con
winding 39 of receiver 38 for delivering to the user a
tacts 82 and the rheostat arm 86, to a desired sound
corresponding ampli?ed sound output.
output volume position along resistance 87, the follow—
In a transistor ampli?er unit 10/ operating, with a bat
ing operating circuits will be established:
45 tery unit 59 in the way described above, the ampli?ed
From the ampli?er casing 11 and its ground 29 through
signal currents ?owing in the circuit of the transistor am
conductor leads 28, through common emitter lead 23 and
pli?er also ?ow through the battery cells such as battery
its resistance 23-1, to the emitters of the two push-pull
transistors 24, and through their two collectors and their
two collector leads 26, thence through two leads of ?exi
ble cord 37 to the end terminals of output or receiver
cells 52 to 55 of the battery unit 50 which supply the
operating energy for the transistor ampli?er 21 which is
positioned closely adjacent the battery cells and circuits of
the battery unit 50.
winding 39 of receiver ‘38; thence through the return
As an example, all the signal current ?owing in push
circuit from center tap of receiver winding 39 through the
pull through the output winding 39 of the receiver 38 also
lead ‘of cord 37, ampli?er conductor 32 and its conductor
flow through each of the series-connected battery cells,
section 32——1 to the ampli?er supply terminal 4-8, and 55 arrows applied to symbolic connections of each battery
the engaged battery connector terminal 4—P; thence
cell 52 to 55 to their cell connectors 61, 62, indicating the
through battery conductors 71, 72, 73, cell 53 and its two
path and direction of a momentary signal current ?owing
connector terminals 61, 62, through conductors 74, 75
through the respective cells. Each signal current thus
and cell 52 and its two connector terminals 61, 62,
?owing, for instance in the direction of the arrows through
through conductors 75, 76, to battery connector terminal 60 the respective battery cells 52 to 55, will induce around
2~P and the engaged ampli?er supply terminal 2-S; thence
each cell 52 to 55 a magnetic ?eld ?ux, the ?eld forces
through the two switch contacts 82 with their switch
of which are represented by face lines encircling the signal
arms ‘81 back through ampli?er supply terminal 1-8 and
current path of the respective cell.
the engaged battery connector terminal 1—P; thence
Since the DC. supplying battery cells 52 to 55 are
through conductors ‘64, 65 of the battery unit and cell 54
positioned closely adjacent the ampli?er unit with its
with connector terminals 61, 62, through conductors 66,
magnetic pickup- transducers 12 and 14, the relatively
67 and cell 55 with its connector terminals 61, 62, and
strong ?eld ?uxes induced by the ampli?ed signal cur
thence conductors 68, 69 to battery casing 51 and its
rents through the battery cells 52 to 55 would be inter
ground 29, thus completing the energizing circuit of the
linked with the core and windings of the signal trans
four serially-connected cells 52 to 55 to the ampli?er 21 70 ducers 12 or 14, which supply the weak signal input to
and the associated ampli?er circuits.
the transistor ampli?er 21 and thus distort the weak sig
Additional operating circuits between the battery cells
nal output of such pickup device 12 or v14. The distorting
of the battery unit 50 and the transistor ampli?er 21 are
action of the ampli?ed signal currents ?owing through the
established from the two serially-connected cells 52, 53,
battery cells 52 to 55 on the input signals to the transis
through battery conductors 73, 72 leading from negative 75 tor ampli?er 21, is magni?ed by the fact that the ampli
assess’);
8
and 69 extending in close proximity to each other ad
jacent the corner of the main wall 51 and the casing side
wall or rim of the battery casing of the battery unit 50
along which they are shown positioned. Similarly, in
sulated conductors '74 and 76 extending adjacent the
right side rim of battery casing 51, {as seen in FIG. 1,
and carrying ampli?ed signal current in the direction
which supplies its relatively weak signal input to the
indicated by their current arrows, are located immediately
transistor ampli?er 21.
adjacent insulated conductor 72 carrying the same ampli
In accordance with the invention, the battery unit 50
is provided with connector conductors which are posi 10 ?ed signal current in opposite direction, as indicated by
the current arrow applied thereto. Similarly, conductor
tioned in closest proximity along the signal current path
?ed signal current in each of the cells has at each moment
the same direction, for instance as represented by the
arrow applied to the current path of cells 52 to 55, so
that the distorting signal-current ?uxes of the several
battery ‘cells 52 to 55 are ‘all superimposed on the signal
output of the electromagnetic pickup device 12 or 14
of each battery cell, and these conductors are so inter
connected with the serially-connected cells 52 to 55 as
71 of the battery unit, which extends closely to the over
to pass in close proximity and adjacent the current path
lying side wall or rim of ampli?er casing 11 and carrying
signal current in the direction indicated by the arrow
ing magnetic ?eld ?uxes. In addition, all other circuit
mutually suppressing the distorting ?eld ?ux produced
of each battery cell 52 to 55, a signal current in a direc 15 applied thereto, has immediately adjacent thereto insu
lated conductor 77 carrying oppositely-directed signal
tion opposite to the direction of the signal current passing
current, as indicated by the arrow applied thereto, for
through the respective cells for minimizing their distort
by their signal currents.
In addition, insulated conductor 64 extending from
battery connector terminal »1-P and immediately adjacent
the overlying casing side wall of the ampli?er casing 11,
their conductor elements so arranged and located as to
and carrying the arrow-directed signal currents, has its
provide-for substantially each conductor portion of the
distorting ?eld ?ux neutralized or suppressed by position
battery unit carrying a signal current in one direction-—
another conductor portion carrying the same signal cur 25 ing a conductor portion 32—1 of the ‘ampli?er unit im
mediately adjacent the other side of this ampli?er casing
rent in opposite direction, thereby neutralizing and mini
side wall 111, and carrying the same but opposite arrow
mizing the distorting effect of the ?eld ?uxes produced
directed signal current.
by signal currents passing through conductor portions of
FIG. 2 is a cross-section of the actual construction of
the battery unit.
the casing 51 of a battery unit 50 of an integral hearing
FIG. 1 shows, as an example, one arrangement of cir
aid unit, shown partially diagrammatically in FIG. 1.
cuit connections between the several battery cells 52 to
The battery casing is similar to the ampli?er casing de
55 of the battery unit 5t} and the closely adjacent ampli
scribed in connection with FIGS. 1 to 17-0 of Gage
?er unit it}, whereby the distorting signal ?eld ?ux pro
conductors of the battery unit 50 through which each cell
or cell of the battery unit is connected with each other
and with the battery ampli?er connector terminals, have
duced by ampli?ed signal currents ?owing in the various
circuit elements of the battery unit on the signal input
current of the transistor ampli?er, is suppressed or mini
mized. As seen in FIG. 1, the elongated battery cell 52
which carries va momentary ampli?ed signal current,
marked by the arrow applied to its current path, has
Patent 2,789,160.
It has a generally ?at, oblong or
rectangular shape, and is formed of thin, non-magnetic
sheet metal, such as a practically non-magnetic grade of
stainless steel. The major bottom wall of battery casing
51 is surrounded by an upstanding casing rim wall having
a?ixed to its bottom rim wall and side rim walls border
connected to its cell connector terminal 61 an insulated 40 ing the cell-housing space (FIG. 2), wall ?anges 51-1
conductor 75 carrying the same signal current in oppo
site arrow direction, and closely adjacent the signal cur
rent path of cell 52, for neutralizing or for suppressing
and minimizing the distorting ?eld ?ux produced by
which project above the upper edge of the rim side
walls of casing 51. The casing wall ?anges 51-—1 are
enclosed by side rims 51-6 of a battery compartment
cover wall 51—5 likewise made of non-magnetic sheet
the signal current through cell 52. In a similar manner, as metal such as stainless steel. The side rims 51-6 of
the casing cover wall 51-—5 have hinge-arms 55—7,
each of the other cells 53, 54 and 55 has serially con
nected in its circuit, ‘an insulated, elongated conductor 73,
broken-away portions of which are shown in FIG. 1,
76 and 68, respectively, extending immediately adjacent
through which the cover wall 51—5 is pivotally con
the current path through the respective cell so as to
carry in such conductor 73, 76, 68 a ?ux-?eld neu
tralizing signal current in the direction of the arrow
applied thereto, which arrow direction is opposite to
the arrow direction of the signal current ?owing in the
nected, as by pivot pins 55—8, to the adjacent portions
of casing side-wall ?anges 51--—~1.
With this "arrange
ment, the cover wall 5i1—5 may be hinged upwardly on
its hinge pins 55—8 from the closed position shown in
FIG. 2, to a lifted position in which the entire space of
the cell compartment of casing 51, as seen in FIGS. 1
respective cells 53‘, 54 and 55.
In addition, ‘all other conductor connections of the 55 and 2, is exposed ‘for enabling replacement of each of
the several battery cells 52 to 55 with fresh battery cells.
battery unit 50 extending between the individual cell ter
Against the metallic side-wall ?anges 51—1 (FIG. 2)
minal connectors ‘61, 62 and its casing ground 29 and
of battery casing 51, are insulatingly secured the sets of
also its ampli?er connector terminals 1-P through 4—P,
opposite-polarity, plate-shaped, metallic cell-conductor
are so arranged that for each connector conductor portion
carrying signal current in one direction, there is an ad 60 terminals 61, 62. In the form shown, a ?lm 51—-2 of
insulating material such as polyethylene ?lm, is cemented
with one surface of the inwardly facing surface of casing
side wall ?ange 51-4, and with the opposite surface
to the metallic conductor connector terminals 61, 62,
ductors.
65 respectively. Any of the known metallic cements may
be used ‘for providing a strong insulating joint of the
In the battery unit of FIG. 1, the connector conductors
terminal plate members 61, 62 to the underlying insu
65, 67, 69, 7‘1, 72, 74, are shown located in different
lator sheet 51—2 and its underlying metallic casing
positions along the battery‘ unit in a manner generally
?ange ‘51-4. As an example, the known cyanoacrylate
corresponding to their location in the practical ampli?er
battery unit 5%) of the invention, shown partially diagram 70 adhesives, such as sold commercially under the trade
name “Eastman 910‘” by Eastman Kodak Company, may
matically in this ?gure. Thus, the insulated conductors 65
be used for this purpose.
and 67 which carry signal current in the direction of the
One of each pair of cell connector terminals 61, 62,
current arrows applied thereto, are located immediately
such as terminal plate member 62, of each cell com
adjacent the conductor 69 carrying signal current in
opposite direction, all these insulated conductors 65, 67 75 partment, is arranged to hold, as by ?anges, the adjacent
jacent other conductor portion carrying the same signal
current in opposite direction, ‘for thereby neutralizing or
suppressing the distorting effect of magnetic ?uxes in
duced by signal current through such connecting con
3,054,863
9.,
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end turn of a conventional, helical compression spring
of two di?erent battery units designed in accordance with
the invention to selectively form with the self-supporting,
encased ampli?er unit 10 of FIG. 1, a complete encased,
62-1 arranged so as to engage with its relatively ?at
free end the facing end terminal of a battery cell posi
tioned between the terminal spring 62—1 and the oppo
site cell connector terminal 61.
As indicated in FIGS. 1 to 3, and shown diagram
integral, fully-operative hearing-aid which delivers desired,
selected, different maximum ampli?ed sound outputs.
The hearing aid of FIG. 4 has a battery casing of
smaller size ‘for holding in its cell compartments only
two battery cells, such as only serially~connected cells
54 and 55 of the hearing-aid unit of FIG. 1. The battery
matically in FIG. 1, the cell space within the interior of
the battery casing 511 is subdivided into individual cell
compartments, by a plurality of cell-seating members 91
de?ning the seat or cell compartment for each of the 10 unit 54} of FIG. 4 has connecting conductors 66, 68 ex
respective battery cells 52 to 55. Each seating member
91 is shown formed of sheet material, for instance of
sheet metal, and has a central, ‘raised, folded sheet por
tending immediately adjacent each cell for carrying op
positely directed ?ux-?eld neutralizing signal. current, and
also sets of ?eld-neutralizing connecting conductor por
tions 67, 69, and conductor 64, the ?eld of which is neu-~
tralized by adjacent ampli?er conductor 32-1, arrows
indicating the direction of their respective signal currents.
tion providing along the upwardly facing exterior (as
seen in FIG. 3), diverging seating surfaces for engaging
and seating the facing longitudinal segmental regions of
the respective cell casings 56. Each folded seating mem
In a similar way, the hearing aid of FIG. 5 has a bat
ber ‘91 has bottom side arms 92 which underlie the
tery casing holding only one cell, such as cell 55, with
cylindrical casings 56 of the adjacent individual battery
similar ?eld-neutralizing, connecting conductor 68 for
cells, and are a?ixed as by spot-welding, to the under 20 the cell 55, and similar pairs of ?eld-neutralizing connect
lying surface of the battery casing 51. The facing edge
ing conductors 67, 69 and 64, 32—1.
surfaces of adjacent leg arms 92 of each seating mem
ber 91 leave between them a narrow, longitudinal space
In an analogous manner, the battery unit may be de
signed to operate with any other required number of
alike battery cells to provide for neutralization and sup
extending lengthwise along the overlying battery cell
casing 56, through which elongated space extend the 25 pression of distorting ?eld ?uxes produced by ampli?ed
respective insulated conductors 66, 68, 73‘ and 75 for
signal currents ?owing through the cells and the cell
respective cells 54, 55, 52 and 53, and carrying ampli?ed
connector-circuits of such battery unit.
signal current opposite to the signal current carried by
It will be apparent to those skilled in the art that the
the respective cells. The other insulated connector con
novel principles of the invention disclosed herein in con
ductors which extend between the cell terminals 61, 62, 30 nection with speci?c exempli?cations thereof, will suggest
which extend transversely to the elongated axes of the
various other modi?cations and applications of the same.
respective cells'52 to 55, are positioned along the side
It is accordingly desired that in construing the breadth
corners between the main battery casing wall 51 and
of the appended claims, they shall not be limited to the
the lower edges of casing side-?anges 51-—1.
speci?c exempli?cation of the invention described above.
In accordance with the invention, the ampli?er unit ‘10 35 We claim:
forms a self~supporting unit designed for ready removal
1. In a transistor ampli?er for amplifying a signal input
and replacement in operative position in an ampli?er
and having at least one transducer including a ferromag
compartment of a battery casing 51. The ampli?er unit
netic core with windings interlinked with said core and a
is enclosed in a ?at casing having casing walls 11 similar
transistor ampli?er circuit including said windings, said
to casing walls 51, 51—-5 of the battery unit of FIG. 2,
ampli?er circuit passing signal current through said wind
which enclose on substantially all sides the components
ings and constituting a compact ampli?er unit, a battery
and circuit elements of the transistor ampli?er unit 10
unit comprising at least one elongated battery cell and
described above, and designed to replaceably ?t within
means detachably holding said cell closely adjacent to
the ampli?er compartment provided in the upper part of
‘said ampli?er circuit, connecting conductors connecting
battery casing 51, as seen in FIG. 1. The complementary 45 said cell with said ampli?er circuit for supplying direct
casing Walls of such ampli?er unit may, for instance, be
current thereto, said ampli?er unit and said battery unit
formed by the complementary casing wall portions of
and all their connections being enclosed in a compact
the hearing-aid casing described in Gage Patent 2,789,160,
casing and being positioned in close proximity to each
other, said connecting conductors connecting the windings
cluding its two signal pickup devices 12, 14, with exposed 50 of said transducer in series with said cell, said connecting
connector terminals 31 for the plug of receiver cord 37
conductors also passing signal current of said ampli?er
and exposed supply terminals 1-S, 2—S, 3—S and 4-8 for
circuit, said signal current passing through each cell of
automatically establishing the operating circuit connec
said battery unit generating a magnetic leakage ?eld
modi?ed to enclose only the ampli?er components in
tions with the circuits of the battery unit 50, such as
described above. The extended, overlapping casing walls
of the battery casing 51 and of such ampli?er casing 11
have an aligned microphone opening, such as indicated
at 12—1 in FIG. 1, through which the microphone 12
of the ampli?er unit 10 picks up sound in the surrounding
which disturbingly interlinks with said core and said wind
5
ings, said conductors including one conductor extending
closely adjacent to each cell of said battery unit and
connected to pass signal current in a direction opposite
to the signal current through the cell adjacent to the re—
spective conductor for minimizing disturbing magnetic
space. The relatively extended ampli?er casing wall oppo 60 interlinkage of signal current through said cell with said
site to that having the microphone opening 12—1, forms
core and said windings.
a continuation of the battery cover wall 5-1-5, so that
2. In a transistor ampli?er as claimed in claim 1, said
the battery casing wall 51 encloses only one major outer
ampli?er casing wall 11 and portions of its three rim side
walls ?tting within and against the upper rim wall, and
the adjoining two side rim walls of the upper section
of battery casing 51, as seen in FIG. 1.
connector conductors also including additional longitud
inal conductors carrying ampli?ed signal currents between
said cell and the circuits of said transistor ampli?er, at
least two-thirds of the length of said longitudinal con
In accordance with the invention, the same encased
tending, different conductors carrying signal currents, with
substantially each length of said ditferent parallel con~
ductors being connected to carry substantially equal but
oppositely-directed ampli?ed signal currents and thereby
suppress distorting magnetic ?elds produced by signal cur
rents ?owing through said parallel conductors.
ampli?er unit, such as ampli?er unit 10 described above,
is arranged for forming with di?erent, selected battery
units having smaller or larger numbers of serially-con
nected, alike battery cells, self-supporting, integral, fully
ductors consisting of adjacently positioned, parallel-ex
operative hearing aids, or in general, audio-frequency
sound-transducing units of selected desired power output.
3. In a transistor ampli?er as claimed in claim 1, said
FIGS. 4 and 5 show partially diagrammatically, examples 75 ampli?er unit constituting an integral, self-supporting unit
3,054,863
1l
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.
l2
and adjacent each of the respective cells and connected
detachably joined to said battery unit for forming there
with a unitary, self-supporting, portable, operative struc
ture, said ampli?er unit and said battery unit having
cooperating sets of disengageable connector elements for
selectively establishing the circuit connections between the
circuit elements of said ampli?er unit and of said battery
unit, whereby said ampli?er unit may be selectively joined
to pass the same signal current in a ‘direction opposite to
the direction of the cell signal current through the respec
tive cell, for minimizing disturbing magnetic interlinkage
of signal current passing through said cells with said core
and said windings.
7. ‘In a transistor ampli?er as claimed in claim 6, said
connector conductors also including additional longitudi
to the casing of a selected di?erent battery unit having
nal conductors carrying ampli?ed signal currents between
a diiierent number of battery cells selectively connected
to said ampli?er means through said cooperating con 10 said cells and the circuits of said transistor ampli?er, at
least two-thirds of the length of said longitudinal con
nector elements.
ductors consisting of adjacently positioned, parallel-ex
4. In a transistor ampli?er as claimed in claim 1, said
tending, different conductors carrying signal currents, with
ampli?er circuit having a ?rst and a second transducer
substantially each length of said di?erent parallel con
each including a ferromagnetic core with windings inter
linked with said core and both windings being included 15 ductors being connected to carry substantially equal but
oppositely-directed ampli?ed signal currents and thereby
in said ampli?er circuit, the core and windings of each
suppress distorting magnetic ?elds produced by signal cur
rents flowing through said parallel conductors.
transducer disposed in su?iciently close proximity with
said cell to be subjected to disturbing interlinkage with
magnetic leakage ?elds of said cell signal current.
8. In a transistor ampli?er as claimed in claim 6, said
ampli?er unit constituting an integral, self-supporting unit
detachably joined to said battery unit for forming there
with a unitary, self-supporting, portable, operative struc
ture, said ampli?er unit and said battery unit having
5. In a transistor ampli?er as claimed in claim 4, one
of said transducers comprising a microphone and the other
transducer comprising a receiver, the microphone winding
being connected to ‘the input side and the receiver winding
being connected to the output side of said transistor ampli
?er circuit for supplying ampli?ed pickup signals to said
receiver.
6. In a transistor ampli?er for amplifying a signal in
put and having at least one transducer including a ferro
2
cooperating sets of disengageable connector elements for
selectively establishing the circuit connections between the
circuit elements of said ampli?er unit and of said battery
unit, whereby said ampli?er unit may be selectively joined
to the casing of a selected dilferent battery unit having a
different number of battery cells selectively connected to
magnetic core with windings interlinked with said core
and a transistor ampli?er circuit including said windings, 30 said ampli?er means through said cooperating connector
elements.
said ampli?er circuit passing signal current through said
9. In a transistor ampli?er as claimed in claim 6, said
windings and constituting a compact ampli?er unit, a bat
unit having a ?rst and a second transducer each including
tery unit comprising a plurality of elongated battery cells
a ferromagnetic core with windings interlinked with said
and means detachably holding said cells closely adjacent
to said ampli?er unit with alike cell poles of said cells 35 core and both windings being included in said ampli?er
circuit, the core and windings of each transducer disposed
having alike orientation, connecting conductors connect
in sui?ciently close proximity with said cells to be sub
ing said plurality of cells in series with each other and
jected to disturbing interlinkage with magnetic leakage
with said ampli?er circuit for supplying direct current
of ?elds of said cell signal currents.
thereto, said connector conductors also passing ampli?ed
signal current of said ampli?er circuit through said serially 40 10. In a transistor ampli?er as claimed in claim 9,
one of said transducers comprising a microphone and
connected cells, the windings of each of said transducers
the other transducer comprising a receiver, the micro
being connected through said connecting conductors with
phone winding being connected to the input side and the
said serially-connected cells and passing said signal cur
receiver winding being connected to the output side of
rent, the magnetic leakage ?eld of signal current passing 45 said transistor ampli?er circuit for supplying ampli?ed
through said cells being disturbingly interlinked with said
pickup signals to said receiver.
cores and each of said windings, said conductors includ
ing one conductor for each of said cells extending along
No references cited.
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