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Патент USA US2128398

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Aug. 30, 193s._
Filed Sept. 16, 1935 ‘
2 Sheets-Sheet 1
3mm .
Y(;lfud.5. Cannon.
Aug. 30, 1938.
Filed Sept. 16, 1935
2 Sheets-Sheet 2
40 4/
Patented Aug. 30, 1938
- SOUND nnrnonoonn
' . Wilford Y.\Cllm0n, Salt Lake out. Utah
Application September 1c, 1935, Serial No. 40,147
1 cum; (or 179-116)
My invention relates to sound reproducers and one side removed and with one diaphragm~ left
more particularly to the type known as ear phones of! to show the interior mounting of the device.
and has for its object to' provide a new and em
Figure 3 is a view oi’ the double diaphragm and
cient double diaphragm ear phone which will be connecting pin.
more efficient, give better voice and sound repro
Figure 4 is an enlarged diametrical section of
duction and greater selectivity than those now on one side‘ of the device showing the mounting of
the open market.
the diaphragms, both sides in this type being
A further‘ object is to provide a new type'ear
phone which will use light weight rubber or fab
10 ric tubes leading to the ears of the user and which
will have the reproducing unit mounted to rest
upon a table or on the chest of the user, enabling
a person to use ear phones in telephony, teleg
raphy, radio, and kindred uses without the heavy
15 phones being carried on the head and weighing so
heavy on the ears of the user.
A still further object is to provide an economical
reproducing element having inexpensive parts,
but giving greater ?eld of reproduction and using
20 two diaphragms mounted to a single armature and
Figure 5 is a sectional view of the armature and
support therefor showing an enlarged view there 10
of to clearly show the mounting of the armature
in the central support.
Figure 6 is a plan view of the voice coil spool.
Figure 7 is an end view of Figure 6.
Figure 8 is a diametrical section of a modi?ed 15
reproducing unit showing the use of a. ?at magnet
for an inexpensive unit.
Figure 9 is a section on line. 9-9 of Figure 8.
Figure 10 is a vertical section of the same sin
gle straight magnet shown in use in an ear phone
giving .o? sound in both directions from the unit with only~one diaphragm and showing the same
and with this unit, the extra ear phone is elimi
new diaphragm mounting.
nated and its accompanying parts arenotused and .
Figure 11 is a side elevation of Figure 9. '
also the head piece and support of the usual head
Figure 12 is a diagrammatic view showing the
set is eliminated.
use of the ear plugs used on the tubing to con 25
A still further object is to provide a better nect‘the speaker unit with the ears.
method of securing the lead in wires to the re
In the drawings I have shown the reproducing
producer providing a unit from which the lead unit as A, having end members or caps B and C
in wires may be pulled out but it they are pulled formed with medial holes I therethrough into
violently out they will not damage the unit or which hollow, stems 2 are secured. The end caps
dislodge or break any of the connecting wires of B and C and the hollow stems are alike. The 30
the voice coil.
end caps B and C are ?anged and the ?ange ‘is
A still further object is to provide a double dia
internally threaded to be screwed onto a join
phragm phone with spacer between so that by ing spacer cylinder 3. A step out- is formed on the
C: Li means of tubing connections to the ears, one ar
inner face of each cap and the diaphragms G and
mature, voice coil, and magnet will serve the pur
‘I mounted in these steps being formed preferably
pose of the two new used, with the one unit giv~ of equal diameters, and ?rst an inner ring 8 is
ing reception to both ears and eliminate much placed within the step at the‘ back side thereof
static and outside interference found with double and then the diaphragm is placed in the step and
40 ear phones commonly used in head sets.
outside this another snap spring ring 9 is snapped
A still further object is to provide a new and '
efficient mounting for the diaphragm giving fuller
action and greater sensitivity to the unit.
These objects I accomplish with the device l1
lustrated in the accompanying drawings in which
similar numerals and letters of reference indicate
like parts throughout the several views and as
described in the speci?cation forming a part of
this application and pointed out in the appended
In the drawings in which I have shown my de
Figure 1 is a vertical diametrical section of one
of my reproducing units.
Figure 2 is a face view of one 01' the units with
into place holding the diaphragm mounted there
between giving a full amount of ?exibility to the
diaphragm. To the cap B I then secure my horse
shoe magnet ill by suitable clamps or brackets ‘II
and the ends l2 and i3 of the magnet are pro
vided with pole pieces l4 and I5 respectively.
These pole pieces are U-shaped and carry the
voice spool and coil C therebetween. The coil C
is provided with a core I‘! in which the armature
i8 is pivotally mounted by inserting pointed pivot 50
pins Illa through the sides of the core I’! with the
points of the pins inserted into conical sockets IS
in the sides of the armature l8. The side 20 of
the coilis provided with a cylindrical boss 2| near
the outer perimeter thereof adjacent one end and 55
a like boss Zia near the core and the wire 22 oi’
the coil is passed through these bosses and se
cured thereto by suitable means to more securely
hold the wires of the coil from loosening or leak
age. The wire 22 is then connected at each free
end to screws 23 which screws are inserted into
threaded sockets“. Two sockets 2! are bored
into the side of cap B and the plugs 2' of the con
necting lead in wires 21 are placed in the socket
25 and the screw 23 screwed down onto the plugs
to make the contact between the voice coil and
the lead in wires and with this connection the ten
sion or stress from the lead in wires is eliminated
from the coil or coil wire. '
In the modi?ed form of the unit shown in Fig
ure 8 the ends of the unit are shown as 30 and ll
with the end II the end to which my ?at magnet
33 is secured by a cap screw 34. This magnet
has bifurcated pole pieces I! secured onto the
20 end 31 by the same cap screw 34 and this pole
piece is made of av ?at strip of metal with the
ends bent with one end secured to the magnet
and the other bifurcated end "a secured to the
U-shaped pole piece 38. The other pole 39 is U
shaped and like the pole piece ll and between
them they hold the voice coil 40 on the spool ll.
Each of the ends 3|! and II are provided with a
step cut 42 similar to the step cut shown at 5 in
Figure 4_and the two diaphragms N and 45 are
carried therein held in place by the rings 48 and
41. The pin It then connects the two dia
phragms l4 and “together and to the arma-v
ture 4‘8, with one end of the pin passing between
the legs or the bifurcated pole piece 8! as shown
in Figures 8 and 9.
In Figure 10 the use of a single ?at magnet is
shown with the device made as an ear phone tor
the type now in use with only one diaphragm
and the pin connecting the diaphragm with the“
armature and not extended out. This view also 5
shows my mounting of a single diaphragm in the
usual type oi ear phone improving the repro
duction of this type oi instrument. _
In Figure 12 the general assembly 0! the pre
ierred type or unit A is shown with tubing E and
F connecting the two stems 2 with the ear plugs
G to transmit the sound to the ear in a manner
similar to the stethoscope, used by physicians. '
Having thus described my invention I desire to is
secure by Letters Patent and claim:
In a reproducing unit of the class described, the
combination of a cylindrical spacer; caps to be ‘
screwed onto each end of said cylinder, said caps
having centrally disposed hollow stems therein; 20
sound transmitting tubes attached to each stem
to carry the sound to the ears of the user; a ?at
magnet mounted to one of said caps; a U-shaped
pole mounted onto one end of said magnet: a bar
extended at an angle from one end of said magnet 23
to a point spaced irom the other end of said
magnet; a U-shaped pole piece carried on said
bar spaced to coincide with the sides of the ?rst
mentioned pole piece; a voice coil mounted be
tween said pole pieces; an armature in said coil: 36
spaced apart diaphragms mounted one in each
cap; and a single connecting pin connecting the
two diaphragms and the armature.
. a5
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