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Патент USA US2404877

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July 30, 1946.
A. F. HORLACHER
2,404,877
SOUND 'TIAANSLATING- DEVICE
Filed July 9, 1941
IN VENTOR.
ALBERT F. HORLACHER
WWW, M ym
ATTORNEYS,
2,404,877
Patented July 30, 1946
UNITED STATES PATENT OFFICE
2,404,877
SOUND TRAN SLATING DEVICE
Albert F. Horlacher, Genoa, 111., assignor to Au
tomatic Electric Laboratories, Inc., Chicago,
111., a corporation of Delaware
Application July 9, 1941, Serial No. 401,591
8 Claims. (01. 181e-31)
1
2
The present invention relates to sound trans
lating devices and more particularly to telephone
receivers of the type disclosed in U. S. Patent No.
Referring now more particularly to Fig. 1 of
the drawing, there is shown a telephone receiver
H] of conventional construction and arrangement,
which comprises a supporting handle Ii formed
of insulating material and provided with a hollow
supporting cup [2 adapted to receive a trans
A telephone receiver of the type mentioned
conventionally comprises a casing, a diaphragm
ducer unit l3. Preferably, the transducer unit
I3 is. of the construction and arrangement of that
mounted on the casing, a transducer unit ar
disclosed in the previously mentioned Wcodruff
ranged in the casing and operatively coupled to
the diaphragm, and a front assembly secured to 10 and Horlacher patent and comprises a cylindri
cal cup-shaped casing 14 housing the associated
the casing and enclosing the diaphragm. The
mechanism and an annular dished diaphragm
front assembly cooperates with the diaphragm to
i5 cperatively coupled to the mechanism by an
de?ne a shallow chamber therebetween and has
operating rod I6. The enclosing casing 54 is
an opening formed therein to provide a restricted
provided with an annular outwardly ?ared ?ange
passage between the exterior and the chamber.
l? which is supported upon the annular rim lid
While a telephone receiver of this character
of the sup-porting cup l2 and an annular inwardly
is entirely satisfactory in operation, it does not
disposed ledge I8 which supports the peripheral
have the uniformity of response at all frequen
portion of the diaphragm l5.
cies within the frequency range thereof which is
Also, the receiver I0 comprises a front assem
desirable.
bly 19 in the form of an inverted cup-shaped
Accordingly, it is the principal object of the
member 28 provided with an annular side wall
present invention to provide a telephone receiver
2i and a dished bottom wall 22. The rim of the
comprising an improved front assembly which is
side wall 2| engages the rim l2a of the support
effective to produce a more uniform response at
all frequencies within the frequency range of the 25 ing cup [2 in close surrounding relation with
respect to the annular ?ange I“! carried by the
receiver.
casing Id. The interior of the side wall 2i car
Another object of the invention is to provide in
2,241,105, Woodru? and Horlacher, granted May
6, 1941.
ries two annular shoulders 23 and 2d which re
a telephone receiver, an improved front assem
bly which is eifective to increase the response in
the low frequency band of the range of the re
ceiver.
A further object of the invention is to provide
an improved front assembly for a telephone re
ceiver which is of simple and. rugged structure
and which is of compact and light-weight con
struction.
The novel features believed to be characteris
tic of the invention are set forth with particu
larity in the appended claims. The invention,
both as to its organization and method of opera
tion, together with further objects and advan
tages thereof, will best be understood by refer
ence to the following speci?cation taken in con
nection with the accompanying drawing, in which
spectively engage the annular ?ange ll carried
by the casing If; and the peripheral portion of the
diaphragm I5. The bottom Wall 22 carries an
ear piece 25 formed of insulatinDr material and
provided with a dished bottom wall arranged in
nested relation with respect to the bottom wall
22. The front assembly 19 and the ear piece
25 are retained in place upon the supporting
cup 12 by a tubular retaining ring 26, the outer
end of the retaining ring 26 being ?anged over
to engage an annular shoulder 27 provided on
(-1 the ear piece 25 and the inner end of the retain
ing ring 26 being internally threaded to engage
an externally threaded portion I'Zb of the sup
porting cup 12. Accordingly, the retaining ring
26 clamps the ear piece 25, the front assembly 19
Figure 1 is a side elevational view, partly in ~._ and the annular ?ange ll provided on the cas
ing Hi securely in place on the annular rim i211
section, of a telephone receiver embodying a con
of the supporting cup I2 and clamps the periph
ventional front assembly; Fig. 2 is a plan View
eral portion of the diaphragm l5 securely upon
of a front assembly for a telephone receiver of
the annular ledge l8.
the character of that shown in Fig. 1 and em
bodying the present invention; Fig. 3 is a longi
tudinal sectional view of the front assembly
shown in Fig. 2; Fig. 4 is a modi?ed form of the
front assembly and embodying the present in
vention; and Fig. 5 is a longitudinal sectional
View of the front assembly shown in Fig. 4. r
55
The. front assembly is cooperates with the dia
phragm l5 to define a shallow chamber 23 there
between; and the bottom wall 22 has an annu
lar row ofopenings 29 formed therein in order
to provide a restricted passage communicating
between the exterior and the chamber 28. The
2,404,877
Ll
3
ber 47. Accordingly, the openings as and 59
annular row of openings 29 formed in the bot
afford a second series sinuous passage through
tom wall 22 is arranged in registry with respect
the compartment "55 between the exterior and
to a centrally disposed circular opening 39 formed
in the ear piece 25 in order to prevent interfer
the chamber Ill’.
The dimensions of the second restricted pas
ence with the passage of the air between the U!
sage, including the openings 49, the compartment
chamber 28 and the exterior.
During the operation of the receiver it] the
136 and the openings 56, are so proportioned and
input signal to the transducer unit it causes the
related that this passage has a predetermined
mechanism housed in the casing I12 to vibrate
mass reactance; while the dimensions of the
the diaphragm l5 through the operating rod l6, 10 chamber 4'! are so proportioned and related that
whereby the air in the chamber 28 is set into
this chamber has a predetermined stiffness re
vibration and passes back and forth through the
annular row of openings 29 formed in the bottom
wall 22, resulting in pressure waves being trans
mitted to the ear of the user.
A conventional
telephone receiver of the character described has
a response characteristic over an operating fre
quency range from approximately 400 to 3200
cycles per second, which includes a ?rst peak at
approximately 1200 cycles per second correspond
ing to the fundamental resonance frequency of
the diaphragm l5 and a second peak at approx
imately 2200 cycles per second corresponding to
the resonance frequency of the air column in the
chamber 28.
actance. More particularly, the mass reactance
of the second passage, including the openings
=29, the compartment 136 and the openings 56, is
so proportioned and related with respect to the
stiffness reactance of the chamber 4‘! that the
effective resonance frequency of the diaphragm
i5 is substantially reduced with respect to the
fundamental resonance frequency thereof. More
speci?cally, it is pointed out that the effective
mass reactance of the second passage mentioned
increases with frequency, whereby the second
passage becomes effectively blocked at a pre
determined frequency within the frequency range
of the telephone receiver [0. When the effective
‘ In Figs. 2 and 3 of the drawing, there is shown
mass reactance of the second passage mentioned
a ?rst form of front assembly 4!] embodying the
present invention and comprising an inverted
cup-shaped member All, including an annular
side wall 122, and a dished bottom wall 43 con
stituting an outer plate. Also, the front assem
bly 49 comprises an inner plate in the form of
a dished ring 44 arranged within the member
41, the outer peripheral edge of the inner ring
44 engaging the outer peripheral portion of the
bottom wall 43 adjacent the side wall 42 and the
inner peripheral edge of the inner ring 44 engag
ing an annular centrally disposed portion of the
bottom wall 43. Preferably, the member 4! and
is increased the effective volume of the chamber
4‘! is decreased due to the blocking of the volume
the ring 461 are formed of a suitable aluminum
alloy and are retained in assembled relation by
the fundamental resonance frequency of the dia
of the compartment 46, whereby the effective
stiffness reactance of the chamber 41 is increased.
Hence, it will be understood that the effective
stiffness reactance of the chamber 41 may be so
proportioned and related with respect to the
effective mass reactance of the ?rst passage,
formed by the openings 48, and the second pas
sage, formed ‘by the openings 49, the compart
ment ‘is and the openings 56, in parallel, that
the chamber Ill has ?rst and second resonance
frequencies disposed respectively below and above
phragm It.
By way of example, it is pointed
staking these parts together. The construction
out that the chamber It‘! may have ?rst and
second resonance frequencies disposed approxi
of the side wall 42 of the member 4! in the front
assembly IE0 is substantially the same as that
mately at 1000 cycles per second and 2400 cycles
of the side wall 2| of the member 29 in the front 45 per second with respect to the fundamental res
assembly IS in order to clamp the peripheral
onance frequency of 1200 cycles per second of
portion of the associated diaphragm l5 upon the
the diaphragm is. This arrangement materially
annular ledge it carried by the casing M of the
increases the sound output of the telephone re
transducer unit 13. Also a series of annularly
ceiver in the low frequency band below the fun
spaced-apart threaded holes #55 are provided in 50 damental resonance frequency of the diaphragm
the side wall 42 of the member iii in order to
l5, whereby the response characteristic of the
receiver IE] is rendered more nearly uniform over
accommodate screws, not shown, which are uti
lized for the purpose of further retaining the
the operating frequency range thereof.
associated ear piece 25 in proper angular rela
In Figs. 4 and 5 of the drawing, there is shown
tion with respect to the member 4!.
55 a modi?ed form of front assembly 63 embodying
A peripheral portion Iiiia of the outer plate 133
the present invention and comprising an inverted
is arranged in spaced relation with respect to
cup-shaped member GI including an annular side
the inner ring 44 in order to de?ne a narrow
wall 62 and a dished bottom wall 63 constituting
an outer plate. Also, the front assembly 60 com
ring-shaped compartment 46 therebetween; while
both a central portion 43b of the outer plate 43 60 prises an inner plate 64 arranged within the
and the inner plate M are arranged in spaced
member 5!, the outer peripheral edge of the inner
plate 84 engaging a shoulder 65 formed on the
relation with respect to the diaphragm 55 in
side wall 62 and the central portion of the inner
order to define a shallow chamber it? there
plate 64 engaging the associated central portion
between. A ?rst annular row of openings 48 are
formed in the central portion 43b of the outer 65 of the outer plate 63. Preferably; the member
BI and the inner plate 64 are formed of a suit
plate 413 in order to afford a ?rst direct restricted
able aluminum alloy and are retained in assem
passage between the exterior and the chamber
bled relation by an arrangement comprising a
47; while a second annular row of openings 49
rivet 66' extending through centrally located
are formed in the outer wall 53 adjacent the
central portion 4% thereof and communicating 70 aligned holes provided in the outer plate 63 and
the inner plate 64. The construction of the side
between the exterior and the compartment 43.
wall 62 of the member 6| in the front assembly
A third annular row of openings 50 are formed
60 is substantially the same as that of the side
in the inner ring M intermediate the inner and
outer peripheral edges thereof and communicat
ing between the compartment 46 and the cham
wall 2! of the member 20 in the front assembly
l9 in order to clamp the peripheral portion of
2,404,877
the associated diaphragm l5 upon the annular
ledge I8 carried by the casing [4 of the transducer
unit l3. Also, a series of annularly spaced-apart
threaded holes 66 are provided in the side wall
62 of the member 6! in order to accommodate
screws, not shown, which are utilized for the pur
pose of further retaining the associated ear piece
25 in proper angular relation with respect to the
member 6!.
What is claimed is:
1. In a sound translating device comprising a
cup-shaped ' casing,
an
annular
diaphragm
mounted on said casing and having a funda
mental resonance frequency, a transducer unit
arranged in said casing and operatively coupled
to said diaphragm, and a front assembly secured
to said casing and enclosing said diaphragm; said
assembly comprising an inverted cup-shaped
The principal body portion of the outer plate 10 member having an end wall providing an outer
63 is arranged in spaced relation with the prin
cipal body portion of the inner plate 64 in order
plate, an annular inner plate arranged Within
said member, and means including an element
extending through aligned centrally disposed
to de?ne a narrow ring-shaped compartment 61'
holes provided in said plates for securing said
therebetween; while the inner plate 64 is arranged
plates together, said outer plate being arranged
in spaced relation with respect to said inner plate
in spaced relation with respect to the diaphragm
l5 in order to de?ne a shallow chamber 08 there
between.
to de?ne a narrow compartment therebetween
and having a ?rst annular centrally disposed row
A ?rst annular row of openings 69 are
formed in the central portion of the outer plate
63 and communicating between the exterior and
the compartment 51; while a second annular row
of openings 10 are formed in the inner plate 64
of openings therein communicating between the
exterior and said compartment, said inner plate
being arranged in spaced relation with respect to
adjacent the peripheral portion thereof and com
municating between the compartment 51 and the
chamber 68. Accordingly, the openings 69 and ‘iii
said diaphragm to de?ne a shallow chamber
therebetween and having a second annular pe
ripherally disposed row of openings therein coin
afford a series sinuous passage through the com
municating between said compartment and said
partment 61 between the exterior and the cham
ber 68.
The dimensions of the restricted passage, in—
cluding the openings 69, the compartment 61
and the openings 70, are so proportioned and
related that this passage has a predetermined
mass reactance; while the dimensions of the
chamber 68 are so proportioned and related that
this chamber has a predetermined stiffness react
chamber, said ?rst and second annular rows of
openings providing a series sinuous restricted
passage through said compartment between the
exterior and said chamber, the mass reactance
of said passage being so proportioned and re
lated with respect to the stiifness reactance of
said chamber that the effective resonance fre
quency of said diaphragm is substantially altered
with respect to the fundamental resonance fre
ance. More particularly, the mass reactance of 35 quency thereof.
2. In a sound translating device comprising a
the passage mentioned is so proportioned and
casing, a diaphragm mounted on said casing, a
related with respect to the stiffness reactance of
transducer unit arranged in said casing and op
the chamber 68 that the effective resonance fre
eratively coupled to said diaphragm, and a front
quency of the diaphragm I5 is substantially re
duced with respect to the fundamental resonance 40 assembly secured to said casing and enclosing said
diaphragm; said assembly having a part spaced
frequency thereof. By way of example, it is
from said diaphragm to define a shallow chamber
pointed out that the effective resonance fre
therebetween and comprising a narrow compart
quency of the diaphragm it or the predominant
ment formed therein, a ?rst opening formed
resonance frequency of the chamber 68 may be
therein and providing a direct restricted passage
reduced to approximately 1000 cycles per second
between the exterior of said assembly and said
with respect to the fundamental resonance fre
chamber, a second opening formed therein and
quency of 1200 cycles per second of the diaphragm
communicating between the exterior of said as
l5. This arrangement materially increases the
sembly and said compartment, and a third open~
sound output of the telephone receiver in the low
frequency band below the fundamental resonance 50 ing formed therein and communicating between
said compartment and said chamber, said second
frequency of the diaphragm [5, whereby the re
and third openings providing a series restricted
sponse characteristic of the receiver I0 is ren
passage through said compartment between the
dered more nearly uniform over the operating
exterior of said assembly and said chamber.
frequency range thereof.
In a preferred embodiment of the front as
sembly 60, the compartment 67 has an average
thickness of 0.030", an inner diameter of ap
proximately 0.3l3" and an outer diameter of ap
55
'
3. In a sound translating device comprising a
casing, a diaphragm mounted on said casing, a
transducer unit arranged in said casing and op
eratively coupled to said diaphragm, and a front
assembly secured to said casing and enclosing
openings 69 are formed in the outer plate 63 and 60 said diaphragm; said assembly comprising an
outer plate and an inner plate both located on
have a diameter approximately 0.0635”; and six
the outer side of said diaphragm, a ?rst portion
annular spaced-apart openings '10 are formed in
of said outer plate being arranged in spaced re
the inner plate 64 and have a diameter approxi
lation with respect to said inner plate to defme a
mately 0.0635”. Also, in this front assembly 60,
the chamber 68 has a diameter of approximately 65 narrow compartment therebetween, a second por
tion of said outer plate and said inner plate
1.682", a peripheral depth of approximately
being arranged in spaced relation With respect
0.040" and a central depth of approximately
to said diaphragm to define a shallow chamber
0.135".
therebetween, the second portion of said outer
While there has been described what is at
present considered to be the preferred embodi 70 plate having a first opening therein providing a
direct restricted passage between the exterior of
ment of the invention, it will be understood that
said assembly and said chamber, the ?rst portion
various modifications may be made therein and
of said outer plate having a second opening
it is intended to cover in the appended claims
therein communicating between the exterior of
all such modi?cations as fall within the true spirit
said assembly and said compartment, said inner
and scope of the invention.
proximately l.602"; six annularly spaced-apart
2404,87’?
“7
plate having a third opening therein communi
cating between said compartment and said cham
ber, said second and third openings providing a
series restricted passage through said compart
ment between the exterior of said assembly and
said chamber.
,
V
4. In a sound translating device comprising a
casing, a diaphragm mounted on said casing, a
transducer unit arranged in said casing and op
eratively coupled to said diaphragm, and a front
8
assembly secured to said casing on the outer side
of said diaphragm; said assembly having a part
spaced from said diaphragm to de?ne a shallow
chamber therebetween and comprising a nar
row compartment formed therein, said assembly
being formed to provide a ?rst direct restricted
passage between the exterior of said assembly
and said chamber and a second series restrict
ed passage through said compartment between
the exterior of said assembly and said chamber,
the dimensions of said second passage being so
proportioned and related that the effective mass
outer plate and an inner ring located on the
reactance thereof increases with frequency in
outer side of said diaphragm, the peripheral por
order correspondingly to increase the effective
tion of said outer plate being arranged in spaced 15 stillness reactance of said chamber, the effec
assembly secured to said casing and enclosing said
diaphragm; said assembly comprising an annular
relation with respect to said inner ring to de?ne a
narrow ring-shaped compartment therebetween,
both the central portion of said outer plate and
said inner ring being arranged in spaced relation
with respect to said diaphragm to de?ne a shal 20
low chamber therebetween, the central portion
of said outer plate having a ?rst opening therein
providing a direct restricted passage between the
exterior of said assembly and said chamber, the
peripheral portion of said outer plate having a
second opening therein communicating between
the exterior of said assembly and said compart
ment, said inner ring having a third opening
therein communicating between said compart
ment and said chamber, said second and third
openings providing a series restricted passage
through said compartment between the exterior
of said assembly and said chamber.
5. In a sound translating device comprising a
casing, a diaphragm mounted on said casing, a
tive stiffness reactance of said chamber being so
proportioned and related with respect to the ef
fective mass reactance of said first and second
passages in parallel that said chamber has ?rst
and second resonance frequencies disposed respectively below and above the fundamental res
onance frequency of said diaphragm.
7. In a sound translating device comprising a
casing, a diaphragm, a transducer unit carried
by said casing and operatively coupled with said
diaphragm, and an assembly unit secured to said
transducer unit and comprising a plate spaced
from said diaphragm to form a chamber there
between, said assembly unit also comprising a
ring-shaped plate having its inner and outer an_
nular edges engaging said ?rst-named plate and
having its body portion spaced from said ?rst
named plate to form an annular compartment,
said ?rst-named plate and said ring-shaped plate
having openings therethrough which provide a
transducer unit arranged in said casing and op~
restricted passage from said chamber through
eratively coupled to said diaphragm, and a front
said assembly unit.
assembly secured to said casing on the outer side
8. In a sound translating device, a casing, a
of said diaphragm; said assembly having a part
spaced from said diaphragm to de?ne a shallow 40 transducer unit mounted in said casing, a di
aphragm located on the outer side of and oper
chamber therebetween and comprising a nar
atively connected to said transducer unit, and a
roW compartment formed therein, said assem
front assembly unit located on the outer side of
bly being formed to provide a ?rst direct re—
said diaphragm, said assembly unit being in the
stricted passage between the exterior of said as»
sembly and said chamber and a second series re“ 3- ' form of an inverted cup-shaped member having
an annular part engaging the edge portion of
stricted passage through said compartment be
said diaphragm and a transverse plate spaced
tween the exterior of said assembly and said
from said diaphragm to form a chamber, said
chamber, the dimensions of said second passage
assembly unit also having a part spaced from
being so proportioned and related that the ef
said plate to form a compartment on the outer
fective mass reactance thereof increases with fre» f
side of said chamber, said plate and said last
quency, whereby said second passage becomes ef~
mentioned part having restricted openings there
fectively blocked at a predetermined frequency
through providing passages from said chamber
within the frequency range of the device.
through said compartment to the exterior of said
. In a sound translating device comprising a
casing, a diaphragm mounted on said casing and 25B assembly unit, and a perforated ear-piece mount_
ed on the outer side of said assembly unit.
having a fundamental resonance frequency, a
transducer unit arranged in said casing and op
ALBERT F. HORLACI-IER.
eratively coupled to said diaphragm, and a front
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