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Патент USA US2122337

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June 28, 1938.
A. J. CAWLEY
Tzmvgsmu ‘SYSTEM
2,122,337
Filed June 3‘, 1930
'
BY
INVENTOR
ATTORNEY
Patented June 28, 1938
2,122,337
UNITED STATES PATENT OFFICE
2,122,337
TELEVISION SYSTEM
Aloysius J. Cawley, PittstomvPa.
Application June 3,’ 1930, Serial No. 459,369
13 Claims. (Cl. 178—7.1)
The invention relates generally to the. electri
cal transmission of images by means of wire or
wireless communicating means.
More particu- '
larly itgis concerned with the production of a
5 very compact means of both demonstrating a
television image and simultaneously receiving
and transmitting an image and has as a very de
sirable object the simultaneous carrying on of a
telephone and a television intercourse, it being
10 possible for two persons to hear and see each
other as though actually in each other’s presence.
The image is received from the distant station
and demonstrated in the same image areas the
image of the person or object that is transmitted
is demonstrated. The advantage resulting from
this arrangement is that two persons carrying on
a telephone-television communication appear to
be looking directly at each other.
Reference is to be had to the accompanying
drawing forming a part of this speci?cation, in
which similar reference characters have like
meanings in all of the views, and in which,
distant station. A lens concentrates the image
in the well known manner in the aperture 5, and
actuates the series of photoelectric cells that are
rapidly moved past the aperture in the well known 15
manner. Placed side by side and moving in ab
solute synchronism with the series of photoelec
Figure 1 is an elevational view of one form of
correspond with each cell. An image-modulated
electromagnetic wave train is received by the an- ‘20
tenna of the receiving apparatus r and is ampli
?ed therein. This ampli?ed current passes by
wires 0 to the brush 0 to commutator 6 to wire
a to neon tube 3, and if desired to wire b to oppo
site segment of commutator to brush e to wire 17 '25
the television transmitting-receiving discs, illus
and back to the amplifying apparatus. The disc
trating the combined photoelectric cells and neon
scans the image and the latter is produced in the
well known manner. The cylindrical lens re
duces all of the illumination of the tube to a
lamps spirally arranged.
so
In Figure 2 the two-way transmission possibi
ties are clearly illustrated. Motor 8 moves shaft
7 and disc I and commutator 6. The disc is ro- 10
tated in synchronism with a similar disc at the
tric cells 2 are neon tubes 3, one being provided to
The invention also produces an image from a
20 number of light sources.
28
rent passes from the cell to wire a to commutator
segment of a commutator 6 to brush 8 to trans
mitting circuit and back to an opposite brush 6,
to wire b to cell 2.‘ The image is formed by a
lens L in the aperture 5. The same lens may be 5
used to view the image formed by the neon tubes
in this same aperture 5.
Figure 2 is a side view of Figure 1 and also il
lustrates the operation of the apparatus as well
as its connection to the transmission and receiv
ing apparatus.
Figure 3 illustrates a modi?cation of the in
vention, in which the photoelectric elements are
35 arranged singly along the spiral line.
i
sharp short line.
'30
An image of the observer or person conducting
the conversation is formed by a lens (not shown)
in aperture 5, and as the series of photoelec
tric cells sweep past, the image is scanned. The
current from the cell passes by the wire to the
- Figure 1 illustrates at I a disc of bakelite or
other material which carries on its surface a se
commutator Ba to brush 0’ by wire m to trans
mitting circuit 73, to wire 11. to brush a’ to com
ries of pairs of photoelectric elements consisting
mutator 6a and by wire (as illustrated in Figure
of a photoelectric cell 2 of the well-known cylin
40 drical form and a neon lamp 3. Each of these
pairs is arranged in a spiral line on the scanning
disc. Wires 0. and b are shown connecting two op
1) to cell 2. If a chopper effect is desired, a
spur wheel 9 is mounted on shaft 1 and coacts
with wheel I0, which in turn moves chopper wheel
I I mounted on the same shaft therewith and sup
posite commutator segments of commutator B. It
is to be noted that,v particularly with the neon
1‘ and 7' are shown playing upon the chopper
45 tubes, connection to but one conductor and scan
ning tube is su?icient. The disc is mounted upon
and turned by a shaft '! operated by motor 8. A
cylindrical lens is provided having its axis at
right angles to the photoelectric cell or neon
50 tube and is shown at 4. This acts to concentrate
the light coming from the tube into a ?ne, sharp
line having its axis at right angles to that of
55
the tube. The connection of a photoelectric cell
2 is shown and is the same ‘for both the neon
tubes and cells on both sides of the disc I. Cur
ported by the casing of motor 8.
Two brushes
‘wheel II. The insulated segments of the latter 45
are partly illustrated by the dark lines across its
face. Its action is to break the current up into
a series of dots or dashes in the well known man
ner. The chopper acts to produce illumination
in the aperture 5 in a series of transverse lines 50
each of which is broken up into a series of dots
or dashes, and produces the effect of a half tone
picture. A low intensity current may be con
stantly applied to the neon tube circuits to main
tain it in operating condition.
55
2
2,122,337
Figure 2 shows a variation of the invention
which consists in arranging the photoelectric ele
ments in the form of single row of photoelectric
elements in contradistinction to a double row as
shown in the other ?gures. There is accordingly
a slight difference in synchronism between the
neon tube image and the photoelectric cell im
age. In the arrangement illustrated in Figure 1
the neon tube image and the photo cell images
are scanned in absolute synchronism.
Figure 3 is therefore, identical with Figure 2
except for the fact that photo cells 2 and neon
lamps 3 traverse the image area consecutively,
there being only one of each in the frame 5 at a
electrical circuits in order to simultaneously re
ceive a television image and transmit another
television image.
3. In combination: a revolving medium carry
ing a group‘ of light sources spirally arranged,
each of said light sources being provided with
cylindrical lenses whose axes are at right angles
to the axes of said light sources, means for ac
tuating but one of said sources in accordance
10
with an image current.
4. A scanning disc having a spiral line of al
ternate photo cells and neon tubes.
5. A scanning disc cooperable with a single
image aperture having a series of neon tubes ar
15
15 time, and also for the fact that the type of neon ' ranged in a spiral line and a series of photoelec
lamp is shown which may be illuminated by
means of one connection or wire only.
When the
image modulated electromagnetic waves from the »
occupy said single image aperture.
transmitting station are received and converted
into image-modulated electric current by the
usual wireless receiving means, such as that of
Figure 2, this current is conducted to the com
mutator Bby means of wires and brushes (as wires .
image aperture having a series of neon tubes ar 20
ranged in a spiral line and a commutator whose
segments are connected therewith in such man
11 and o and brushes e and c of Figure 2)‘.
25
.39
This
image modulated current is in turn conducted to
the neon lamp 3 by means of wire it (since only
one wire is necessary in this modi?cation). The
lamps therefore reproduce the received image in
the image aperture or frame 5, while traversing
its elementary areas successively therein. The
fact is brought out in Figure 3 that but one wire.
a may be necessary to connect the neon lamps,
as there is a well known special type of lamp on
the market that may be illuminated by means of
a single Wire connection.
An image is formed
in the aperture 5 by means of lens placed in
front of it, such as that shown in Figure 1. The
photoelectric cells 2 also traverse this image.
They are suitably connected to the commutator
on the opposite side of the disk I (as shown in
Figure 2). Accordingly, the image modulated
current generated in these cells is ampli?ed and
connected to suitable transmitting apparatus
(such as, for instance, thatshown in Figure 2)
.45
tric cells arranged in a spiral line, said tubes and
said cells being so arranged as to successively
and an image modulated wave train is sent to
the distant station.
This application is a continuation in part of
my application Serial Number 50,528 ?led Au
gust 15, 1925 for Electro optical system and of
50 application Serial Number 455,127,:?led May 23,
1930 for Television apparatus.
Having described my invention I claim as new
and desire to secure by Letters Patent:
1. The method of simultaneously producing a
television image in an image aperture by mov
ing a plurality of light sources consecutively in
adjacent paths in said image aperture while sup
plying said sources with image modulated elec
tric current in order to utilize all of the light of
60 said source to form a visible image in said aper
ture and of scanning an image by moving a plu
rality of photoelectric cells consecutively in ad
jacent paths in said image aperture to produce
an image-modulated current in the said photo
65 electric cells while traversing said aperture.
2. In combination: means for forming an im
age in an image aperture, means for moving a
6. A scanning disc cooperable with a single
ner that but one cell is actuated at a time, and
a series of photoelectric cells arranged in a spiral
line and a commutator Whose segments are con
nected therewith in such manner that but one
cell is at any instant actuated for the simulta
neous reproduction and transmission of television
images, said tubes and said cells being so ar
ranged as to successively occupy said single image
aperture.
7. A two-way television method consisting of
receiving image modulated radio waves from a
distant station and converting said Waves into
light at successive elemental areas of an image
forming a second image in said image area co
extensive With said area and with said reproduced
image, and consecutively converting the light of
said image into a second image modulated elec
tric current at successive elemental areas of said
second image and coextensively in said image
area, converting said second image modulated
current into image modulated radio waves and
transmitting said waves to a distant station.
8. A two-way television method consisting of
receiving image modulated radio waves from a
distant station and converting said waves into
light at successive elemental areas of an image
area in order to reproduce an image in and co- ‘
extensive with said image area, simultaneously
forming a second image in said image area co
extensive with said area and with said reproduced
image, and consecutively converting the light 55
of said image into a second image modulated
electric current at successive elemental areas of
age area.
9. A tWo-way television method consisting of
receiving image modulated radio waves from a
distant station and converting said waves into
light at successive elemental areas of an image
area in order to reproduce an image in and coex
69
tensive with said image area, simultaneously
forming a second image in said image area coex
tensive with said area and with said reproduced
image, and consecutively converting the light of
aperture, said tubes and cells having appropriate
um
said second image and coextensively in said im
said image into a second image modulated elec
tric current at successive elemental areas of said
while passing through said aperture, said neon
"
tensive with said image area, simultaneously
ly arranged photoelectric cells through said im
tubes and said photoelectric cells being so ar
ranged as to simultaneously occupy said image
35
area in order to reproduce an image in and coex
series of spirally arranged neon tubes and spiral
age aperture, and means for permitting but one
of said tubes and one of said cells to function
2,5
.70
second image and coextensively in said image "
area and transmitting said second image modu
lated electric current to a distant station.
10. A two way television apparatus consisting
of means for forming an image, an image aper
2,122,337
ture in which said image is formed, a plurality of
photoelectric cells and suitable associated cir
cuits, means for moving said photoelectric cells
singly and consecutively in adjacent paths
through said image aperture to produce an image
modulated electric current; a plurality of light
glow lamps singly and consecutively as it trav
erses said image aperture to a receiving circuit,
the image formed by said image forming means
and the image produced by said glow lamps being
coextensive‘with said image aperture.
sources and suitable associated circuits, means for
12. A television apparatus consisting of an im
age aperture, a rotatable disk adjacent and in
moving said light sources consecutively and singly
in adjacent paths through said image aperture,
cooperative relation with said aperture, a plurality
of electro-optical elements mounted upon said
means for supplying said light sources with a
suitable image modulated current to produce a
visible image in said aperture by the variation
in intensity and movement of said light source,
the image formed by said image forming means
15 and the image produced by said light sources be
ing coextensive with said image aperture.
11. A two-way television apparatus consisting
v20
3
of an image forming means, an image aperture
in which said image is formed, a disk cooperating
with and movable across said image aperture, a
plurality of photoelectric cells and glow lamps
spirally arranged on one face of said. disk and
movable thereby consecutively and singly in ad
jacent paths across said image aperture, a com
25 mutator associated with said disk and suitably
connected to said photoelectric cells, a second
commutator associated with said disk and suit
ably connected to said glow lamps, means coop
erating with said commutator for connecting
30 each of said photoelectric cells singly and con
secutively as it moves across said aperture to a
transmission circuit, means coacting with said
second commutator for connecting each of said
disk and movable thereby across an image 10
formed in said aperture singly and consecutively
in adjacent paths, a commutator suitably con
nected to said electro-optical elements, means
cooperating with said commutator for consecu
tively connecting each of saidelectro-optical ele
15
ments to an external circuit as each of said ele
ments traverses said image aperture and a cylin
drical lens adjacent each of said electro-optical
elements with its longitudinal axis at approxi
mately a right angle to the axis of said elec 20
tro-optical element.
13. A two way television process consisting of
forming an image of light waves in an image
area, successively converting the light of the ele
mental areas of said image into image varied 25
electric current at the successive elemental areas
of said image area, and converting a second im
age varied electric current into light waves at
successive elemental areas of said image area in
order to obtain a reproduced image in said image
area, said image and said reproduced image being
coextensive in said image area.
ALOYSIUS J. C‘AWLEY.
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