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Патент USA US2060287

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Nov. 10, 1936.
Filed May 29, 1935
F/OS/O’ ./. 00/3627
Patented Nov. 10, ‘1936
Floyd J. Dofsen, San Francisco, Calif.
Application May 29, 1935, Serial No. 23,983
4 Claims.
(01. 274-43)
This invention relates to a sound record and a -
process of producing a sound record for use'in
small reproducing mechanisms, such as novelties,
especially those in which the sound record takes
5 the form of a tape of ?exible material. .
An object of my invention is to produce tape
sound records in large quantities economically.
Another object of my invention is to produce
a sound record in which the‘matrix for producing
10 the-record is not unduly distorted during its nor
mal life.
An additional object of my invention is to pro
vide a sound record which has a, raised sound
track thereon.
A further object of my invention is to provid
a process of producing a sound record which will
I afford a raised track without utilizing an excess
of material.
The foregoing and other objects are attained in
20 the embodiment of the invention illustrated in the
drawing, in which-
Fig. 1 is a side elevation, partly in section, of a
small sound reproducer incorporating the sound
record of my invention.
Fig. 2 is a diagram to illustrate the process of
my invention.
Fig. 3 is a cross-section of the tape within the
forming rolls.
Fig. 4 is a cross-section of my sound record on
30 an enlarged scale.
The sound record of my invention preferably
comprises a strip of ?exible material, thereby pro
viding' a tape, which has a displaced portion the
projecting part of which carries a sound track and
35 the depressed portion of which‘is substantially
‘complementary to the raised portion. The proc
ess of my invention includes producing such sound
record by the simultaneous impression of a sound
track on a displaced portion of a tape while the
40 tape is soft, and subsequently permitting the im
pressed and displaced tape to harden for use.
The sound record of my invention is useful in
very widely varying environments, but is espe
speed over the record, vibrations of the diaphragm
9 are produced, so that audible signals emanate
from the aperture 1. Usually a short sentence is
impressed upon the sound record l2 and is re-_
produced each time the userjretraces his thumb-,- 5
nail over the sound track.
' In accordance with my invention, I preferably
provide that the sound record l2 be constructed
of celluloid or comparable ?exible material, in
the shape of a relatively long, narrow, ?at strip. 10
The tape so formed is preferably provided withan
upstanding ridge l3 extending longitudinally of
the tape and located centrally between the sides
thereof to afford lands l4 and I 6. The ridge I3
is generally rectangular in cross-section and up- 15
stands from the general plane of thelands l4 and
I6 in a predetermined amount I‘! which in one in
stance is approximately ‘4/1000ths of an inch.
The upstanding ridge l3 on its face carries un
dulations l8 which represent the sound waves and
together constitute the sound track, generally des
ignated l9.
In accordance with my invention I preferably
displace the material for the upstanding ridge
[3 by providing a complementary groove 2I' on 25
the opposite face of the tape I2, which groove is
substantially rectangular ‘ in cross-section and
corresponds almost exactly to the ridge l3, ex
cept for the fact that the height 22 of the groove
is ‘substantially more than the height of the" 30
ridge IS, in one practical instance being approxi
mately 6/ 1000ths of an inch. The resulting dis
placed central portion 23 of the tape is conse
quently of lesser thickness than either of the side
portions beneath the lands l4 and I6.
In accordance with my invention, I preferably
provide my sound record by a process especially,
illustrated in Figs. 2 and 3. As shown in these
?gures, a strip 26 of celluloid or comparable ma
terial, of sufficient width to provide a plurality 40
(for instance, twelve) of ?nished sound records,
is immersed in a bath 21 of warm water, so that
the material is softened. The strip 26 is then
fed between a pair of rolls 28 and 29, which turn
upon their axes at the‘ same rate but in opposite 45
‘directions. The upper roll '28 is provided with a
circular-cylindrical contour, having a sound dis- . depressed portion 3| in which are anchored the
persing aperture 1 in the front face thereof and ends 32 of an electrolytically formed sound die
a small aperture 8 in the rear face or diaphragm 33. This die in cross-section is 'a thin sheet of
50 9 thereof for the reception of the knotted end ll metal, usually copper, carrying the complement 50
of a sound record l2. For operation, the box 6 of the sound track thereon in a groove 3!, which
is held between the thumb and fore?nger of a is duplicated or varied for each of the plurality
,user, who grips therecord l2 between the index of strips with which it is intended to contact.
?nger and the thumbnail of the opposite hand. . The die 33 is wrapped around the roller 28 and
55 When he advances his thumbnail at a constant is con?ned between side ?anges 35 and 36 on 55
cially applicable for use in conjunction with a
.45 novelty or small sound reproducer such as is
shown in Fig. 1. The device includes a box 6 of
the roller 28, which hold the die accurately in
position. The roller 29 on its periphery is pro
vided with ridges 38, in contour corresponding
to the grooves II, and being provided one for
each of the plurality of records.
The softened tape is fed through the rotating
rollers 28 and 28, beginning with the beginning
of the die 33, and simultaneously the central por
tion of the record or tape is displaced to provide
10 the central portion 23' and the sound track I9
then knotted to form an anchor II for use in
the device shown in Fig. 1.
I claim:
1. A sound record comprising a strip of ?ex
ible material having a straight longitudinal ridge
of uniform width projecting from one side there
of and bearing the sound track, and a straight
longitudinal groove on the other side thereof
in substantial registry with said ridge.
2. A sound record comprising a ?exible tape 10
is impressed in the surface of each of the rec
having its central portion offset from the side
ords. Since the pressure between the rollers is portions thereof to form an elevated rectilinear
con?ned to the central portion 23 of the tape, . rib of uniform width with the sound track on
there is no tendency to stretch or otherwise ‘dis
15 tort the thin die 33 which otherwise would be
the case after protracted use. The die 33 is
therefore useful almost inde?nitely.
During the impression the heat contained in
the warmed and softened tape is imparted to
'20 the relatively cool rollers 28 and 29, so that
simultaneously, or substantially so, the displaced
and impressed tape is hardened. As they emerge
from the rollers 28 and 29, or subsequently if
desired, the individual sound records are out
apart at the places indicated by the broken lines
31 in Fig. 3 to provide the individual sound rec
ords as illustrated in Fig. 1, each of which is
said projecting central portion.
3. A sound record comprising a ?exible tape 15
having a ridge of a predetermined height and
width on one side thereof bearing‘ the sound
track and having a complementary groove of
lesser height on the other side thereof.
4. The process of producing a sound record
which ‘comprises advancing a tape to receive the
sound track, and simultaneously impressing a
sound track of ?xed width on one side of said
advancing tape and impressing a complementary
groove having said ?xed width on the other side 28
of said advancing tape.
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