US1774348A - Television transmitting and receiving apparatus - Google Patents

Description

Aug. 26, 1930. A. BARNES TELEVISION TRANSMITTING AND mscmvme APPARATUS Filed Nov. 16. 1928 2 Sheets-Sheet l J 1 1R a WK i T. H a mm Q s m R R Q NNWN Q & m \\x N m mm p m T u m M H I I70 212711221:- flZZe/z Z.Ba7ne.s,

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Aug. 26, 1930. A. L. BARNES -TELEVISION TRANSMITTING AND RECEIVING APPARATUS Filed Nov. 16, 1928 2 Sheets-Sheet 2 r s 8 w w Wu m a m R 3 a I 1 4, A Mg .5 I. L W m m o WV, W x Q m W 00 & W s QKWN a fifi m Q Q MW Patented Aug. 26, 1930 UNITED STATES ALLEN L. BARNES, OF OAK'PARK, ILLINOIS TELEVISION TRANSMITTING AND RECEIVING APPARATUS Application filed November 16, 1928. Serial N0. 319,750.

This invention relates to television, transmittin'g and receiving apparatus, having for its object the provision of improved methods and means for the reproductionof pictures,

objects, scenes, etc., through the medium of electro-magnetic waves in conjunction with optical means.

Another object is to provide apparatus of thekind described of a type suitable for the display of television, motion pictures with or without natural colors on a suitable screen of the general type used in cinematographprojection, or on a surface of ground glass.

The invention further contemplates the reproduction of scenes broadcast by methods 1 used in daylight exposures, but employing the rotary color filters, as herein provided.

Other objects and advantages will appear more fully in the hereinafter described details when taken in connection with the accompanying drawings in which,

Figure 1 is a diagrammatic representation of a television transmitting and receiving system embodying the method and means 2 employed in the present invention.

F ig. 2 is a sectional View of the television transmitter used in the present invention.

Fig. 3 is a sectional view taken on line-33 of Fig. '2, looking in the direction of the arrows.

Fig. 4 is a face View of a transmitting scanning disk.

Fig. 5 is a sectional view of the receiver employed by me.

arrows.

Fig; 7 is a fragmentary the receiver showing the arrangement of the electro-responsive' lamps.

Fig. 8 is an enlarged fragmentary face view of the receiving scanning disk. v

Fig 9 is a: fragmentary sectional view .taken on the line 9-9 of Fig. 8. In the drawings A designates the transmitting apparatus which comprises cabinet 10 wherein is arrangeda source of'illu'mination, which in the present instance is preferably an arc lamp 11 mounted in a casing 12 having acondensing lens 13 secured within Fig. 6 is a sectional view, taken on the line 66 of Fig. 5, looking in the direction of the sectional view of rduce gradations of color, all of "which are the casing by the brackets '14. Formed intcgrally with the casing 12 is a projecting hood 15 which serves to exclude extraneous rays'of light from interfering with the rays of light from the arc lamp which are. directed through the red, green and blue color filters 16, 17 and 18 respectively, provided on the margin of the color filter disk 19 which is secured to a sleeve 20 freely rotatable on the shaft 21 of the motor 22. A scanning disk 23 having perforations-24 arranged in the form of a spiral, is secured to the shaft 21 by a set screw threaded through a collar integral with the scanning disk.

By inspection of Fig. 2 it will be seen the hood 15 is provided with an upwardly projected shield 25 having a suitable opening 26 through which the rays of the arc lamp pass and thence through lens 27 into the visor 28, which latter is also'formed integral with hood 16; Rays of light from the arc lamp falling -on the object to be scanned are re.- flected thence upon the photo-electric cell 30 suitably mounted within the opening 29 of the Visor.

The means for securing the differential rotation of disks 19 and 23 is obtained through a gearing system which comprises gear 31 pinned to the motor shaft 21 and meshing with gear 32 which is secured to a stud shaft 33 rotatably supported in a journal 34 formed on the bracket stand 35. The stud shaft 33 is secured against translational movement by the collar 36 at one end and by a collar 32' integralv with gear 32. A second gear 37 is'fastened to .stud shaft 33,

the gear 37 coacting with gear 38, the latter being freely rotatable, on the shaft 21 but fastened to and revolving with the color filter. disk 19. The ratio of the number of cogs in gear 31 to gear 32 being as l to 3 and thoseof gears 37 and 38 being equal, it will be seen that disk 18 rotates once while the scanning disk 23 is revolving three times, it being essenti a-l that disk 23 revolve three times as fast as the color filter disk 19 in order to scan the object through each of the three filters three separate times, the object of this being to procombinations of the three primary colors, red, green and blue.

It is of course to be understood that the photoelectric cell is connected to an amplifying device of the thermionic type. Amplified variations of potential will be produced'in the well known manner by fluctuation in the intensity of light projected on the cell, these variations of potential being radiated from a suitable antenna system as electro-magnetic waves.

The receiver employed in my invention is of a type adapted for coordination with the transmitting apparatus shown in Fig. 1 and designated as A. The receiver comprises a suitable cabinet 30 wherein are rotated a pair of disks 40, 41 mounted on the shaft or an electric motor 42. The disk has a sleeve 44 fastened thereto, the sleeve being freely rotatable on the shaft 43 of the motor. becure on the sleeve is a gear 45 meshing with a gear 9 46, having an integral collar 47 pinned to'a stud shatt 48 revolvably confined by collars 49, 50 in a post 51. A second gear 52 is secured to the revolvable stud shaft, this gear meshing with a pinion 53 secured to motor shaft 43. As the gear ratio in this system is the same as that shown in Fig. 2, the disk 41 will make three revolutions to one of disk 40, the. latter being provided with the red, green and blue color filters respectively similar to those formed in disk 19 shown in Fig. 4. Marginally arranged on the face of disk 44 are a series of concave mirrors 54 which may be secured to the disk in any suitable manner, in the present instance, an adhesive being employed. If desired, a glass "disk may be used and the mirrors ground thereon. As best shown in Fig. 5 it will be seeen that the mirrors 54, when the shaft of the motor 42 is rotated, Will pass into the focus of the parabolic reflector 55 which is provider with electro-responsive lamps 56 which latter are filled with any of the monaltomic gases such as neon, argon, helium, these gases being preferably so combined as to produce a white light. The rays of light from the electro-responsive lamps 56 are projected by the reflector 55 against the concave mirrors 54' and thence reflected through the lens 57 which, is confined in a projecting collar 58 formed integrally with-the reflector 55,the collar 58 vbeing accommodated by cylindrical socket 59 formed integrally with the casing 60 in which the parabolic reflector 55 is placed. After passing through the lens 57 the rays of light thence are directed through the color filters of the filter disk 40 which is similar to the transmitting disk 19, 'the rays being projected on the screen 63.

If it is desired to broadcast scenes taken in direct daylight, the photo electric cell or cells will be suitably screened with a view to eliminating as nearly as possible, all rays of light save those reflected from the objects to be broadcasted.

The mode of operation of the present system of television transmitting and receiving systemhas been in large measure indicated from the foregoing description. The object to be scanned at the transmitting end will preferably be placed contiguous to the openmg of the visor 29, it being assumed that disks 23 and 19 are rotating with speeds in the ratio of 3 to 1. Rays of light from the arc lamp 12 will pass through the color filters or screens 16, 17 and 18 of disk 19 successively, and thence through the holes 24 of disk 23, the period of time required for the revolution of each color filter permitting the scanning disk 23 to make three complete rotations, in other words each of the color filters will be passed by a complete series of the spirally positioned perforations twice. As is well known, all the various hues and gradations of color may be obtained by combinations of the primary colors, red, green and blue., Since the red screen will permit only colors having a light frequency corresponding to the color 01: red to pass through, it will be obvious that the red tones in any objects, PIC- tures or scenes will pass through the red screen, to the exclusion of the others and. by similar reasoning only colors corresponding to the green filter and to the blue filter will passthrough these latter screens. As any color may be matched or produced by a mixture in proper proportion of a saturated red light, a saturated green light and a saturated blue light, it will now be obvious from well known optical principles that practically all natural colors can be reproduced in television transmitting by the method and means herein indicated.

At the receiving end B, the electro-magnetic impulses corresponding to the fluctuations of light intensity received by the photo electric cell 30, and radiated from the transmitting antenna 64, are received by antenna 65, amplified and translated into light impulses by the elec'tro-responsive lamps 56 and projected through the differentially rotating disks 40, 41 on the screen 64 in the manner above indicated.

I am aware of television'apparatus for the purpose of reproducing television motion pictures in colors, but I believe the improved method and means herein described to be new in the art as'described and claimed.

7 It is 'to be understood the method and means herein employed may be widely varied and modified, as will readily be understood by those skilled in the art to which this invention appertains; hence the details of construction are not to be construed literally save to the extent these are circumscribed within the scope of the appended claims.

What I claim as new anddesire to secure by Letters Patent is;

television receiving system for reproducing images viewed in said television transmitting system in natural colors.

2. In a television transmitting system in combination, light occluding and disclosing means comprising a disk having a series of perforations, said disk being secured to a shaft having a second disk freely rotatable thereon, said second disk being provided with color filters, and means connected to said. shaft for difl'erentia'lly rotating one of said disksrelatively to the-other of said disks.

3. In a television transmitting system, a plurality of disks differentially rotatable on a common shaft, one of said disks havi g a series of perforations arranged in the 'orm of a spiral, and the other of said disks having-a plurality of segmentally positioned color fi1- ters corresponding to the red, green and blue primary colors.-

4, In a television transmitting system, aplurality of disks differentially. rotatable on the shaft of the motor within a housing, a source of light within said housing, one of saiddisks having a series of perforations spirally positioned on the margin thereof, the other of said disks having three color filters arranged within arcuate slots formed on the margin thereof, said source of light passing through the color filters and through said perforations while said disks are differentially rotating, and means in a coacting television receiving system for translating electromagnetic waves radiated by said television transmitting system into light impulses, said light impulses being subjected to light occluding, disclosing and coloring instrumentalities, whereby images viewed by said television transmitting system may be repro duced in natural colors by said television receiving system.

5. In a television transmitting and receiving system, a pair of disks differentially rotatable on the shaft of a motor, said motor being enclosed in a container having a source of light, one of said disks being directly fastened to the shaft of said motor, the other of said disks being freely rotatable onthe said shaft but revolved through a system of gearing connected to said shaft and to a countershaft, means comprising a lens and. a lightsensitive cell to translate fluctuations of light intensity from said source of light into variations of electric potential, and means in said television transmitting and receivingsystem, including electro-responsive means for causing said variations of electric potens tial to reproduce at a local point images viewed at a distant point.

6. In a television transmitting system, a pair of disks differentially rotatable on the shaft of a motor, one of said disks having a series of perforations arranged in the-form of a spiral, the other of said disks having a plurality of color filters positioned on the margin thereof, said color filters comprising the red, green-and blue primary colors whereby when said disk having the perforations 1s revolved three times as fast as the disk containing the color filters, each of the said color filters will be traversed by the entire series of said perforations in a manner to reproduce the natural colors of any object being scanned by a source of light projected through said perforations and said color filters.

7. A television receiving system comprising in combination, light reflecting and light coloring means, said light reflecting means of a motor, one of said disks having a series of concave mirrors arranged marginally on the face thereof, the other of said disks having three'eolor filters corresponding to the red, green and blue primary colors of the spec trum, each of said color filters extending along the circular margin of the said disk approximately 120, and means connected to the shaft of said motor for revolving the disk having the. color filters three times as fast as the disk containing the series of concave mirrors.

9. In a television transmitting and receiv ing system, a transmitter comprising in combination, light occluding and disclosing' means secured to a shaft having light coloring means freely rotatable thereon, means connected to said shaft for differentially rotating one of said means relatively to the other of said means, a receiver cooperating with said transmitter, said receiver comprising a pair of disks differentially rotatable on a shaft, one of said last mentioned disks hav ing a series of marginally positioned concave mirrors, the other of said last mentioned diskshaving three color filters corresponding to the three primary colors of red, green and blue positioned on its margin, me-uis connected to. the shaft of said receiver for differentially revolving the disk having the concave mirrors thereon relatively to the disk having the three primary color filters, whereby fluctuations of light at the source of said transmitter and projected as electro-magnetic waves may be translated by said receiver into variations of intensity of light from a suitable source of illumination connected to. said receiver and thence reflected by said concave mirrors through the color filters and a light condensing system for projection on a screen.

10. In a television transmittingsystem, a plurality of disks, differentially rotatable on a common shaft, one of said disks having a series of perforations arranged in the form of spiral, and the other of said disks having a plurality of segmentall positioned color filters corresponding to t e red, green and blue primary colors.

In testimony whereof I have signed-my name to this specification.

ALLEN L. BARNES.

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