US1889727A

US1889727A - Television receiver

Info

Publication number: US1889727A
Application number: US560891A
Authority: US
Inventors: Callo D Fahrney
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-09-03
Filing date: 1931-09-03
Publication date: 1932-11-29
Anticipated expiration: 1949-11-29

Description

Nov. 29, 1932. D FAHRNEY 1,889,727

TELEVISION RECEIVER Filed Sept. 3, 1931 I \/E U HMQW ATTEJRHELI:

Patented Nov. 29, 1932 UNITED. STATES PATENT [OF Fl ck; v

came 1). FAHRNEY, or CAMBRIDGE, MASSACHUSETTS rnrnvrsronnncnrvnn i Application filed September My invention relates to televisionreceivers and has for its basic object the reassembling of unit light va-lues and the display of picbling and display member in parallel strips or other order of units in accordance with the method of scanning or image dissection employed in transmission of the pictures or images to be received and exhibited.

tion and accompanying drawing, which form a partof this specification, but it is to be understood that said drawing is-merely illustrative and is not to be taken as restrictive.

The illustrations in the accompanying drawing show an adaptation of the principles of my'invention to be a receiver of drum type,

in which: ,7

Figure 1 represents an elevation of a device partly in sectionand partly diagrammatical with a section of a picture reassembling and dlsplay member shown in connection there-- with. g

Figure 2 represents a view from above of the device shown in Figure 1, the same being also partly in sectionand partly in diagram.

Proceeding with a detailed description, 1 in Q Fig. 1 represents in section a rotatable member of drum type here shown operative ina horizontal position and provided in its pe-- ripheral casing with a convolution of aper- V tures,'one' of which'is indicated by 2 and which apertures are here arranged in a spiral,

the total number of apertures corresponding with the number of lines employed intransmission of the picture to be received.

Means are provided for sustaining a "lens 3 which may be of vany suitable type in line with each aperture, which lenses may be circular, or for the sake of compactness and the The modulated light producing lamp'a is a, 1931. Serial No. 560,891.

utilization of relatively larger ones, they may I otherfa's here shown.

One means sustalmng'the lenses rad1ally,

bedeleted on their sides adjacent to one an- .as shown in the drawing, being'to' produce an aperture in the casing of the drum from the inside large enough to ins'ertthe lens witha "flange provided by a reduction of the size-of the-aperture in the outer surface of the casing to prevent the lens from passing through, 'successiveenlargements of the aperturefrom the inside being made, where desired, providing sustaining shoulders or collars for additional lenses; means being provided for holding the lensesvimmovably when once properly pla'ced,[but I do not wish to belimited to this method of positioning or sustaining the Other objects of my invention will be apparent from the following detailed descripmay shown mounted directly on thedriving shaft of a motor indicated by 4, in'both figures, which motor may'be of synchronous type or in place thereofaphonic wheel adaptation or other means now well known to those versed in the art may be employed for maintaining synchronism with the-speeds .employed in transmission. In 'practice the usual framing and operative control features-are provided and means may also be provided for shifting the receiver into difierent speeds for tuning in with different transmitting stations that employ difi'erentspeeds in scanning, but it is not deemed necessary to illus-. tratesuch details herein. 7 i 5 in both figures'r'epresents a lamp which maybe of the point orc rater type for supplying the modulated light representing the unitlightvalues of the obj ect'or image .tran'smitted the lampv inFigQl of the drawing being shown with 'a rectangular light emitting aperture to cause the light'spot focused onto a screen to also berectangular inform while the lamp shown in Fig.- 2 shows a round light emitting aperture'b'ut I do not wish to beli-mited to any particular type'of; lamp for the purpose. I

here shown positioned within the rotatable aperture carrying drum 1 with its modulated light open to the path of the rotatory apertures, which light may be confined by a condensing element if desired.

In operation, as the drum 1 r'otates, the apertures in turn permit the passage of llght from the source while the lenses sustained in line with each aperture and indicated by 3 in both figures of the drawing condense and focus the light rays 'fromthe lamp 5 and cause horizontal lines of light to be traced on a member 6 here shown partly in section, which member may consist of a plain or reflective screen or maybe of translucent nature for viewing thepicture from theside .oppositefrom the light supply, means. (not shown) being provided for adjustably supporting the light element and also the picture display member 6. p

, The radial spread of successive beams of light passed by successive apertures is determined and may be controlled in the adaptation here shown by the distance between the apertures and accompanying lens centers and I tions as to prevent more than one spot of light from showing on the display member at any one time.

- In operation, with the modulated light functioning, by revolving the apertured member 1, a spot'of light is directed and focused onto the screen 6 and caused to trace a horizontal line of light thereon, the differ- I cut apertures functioning one after another in like manner in the order arranged.-

" 6 curved accordingly in this direction, but

-In the screening process described it is readily apparent that in case a fiat screening member is used the distance from the light source to dlfi'erentportions of the scanned surface varies accordingly with the resultthat the lenses if all alike do not maintain an exact focus of the traveling light spot onto all parts of the surface with detrimental effects in sharpness of detail and flaring of the lines transversely towards the edges of the scanned area. a

To overcome this objectionable lack of uniform focusing on the screen in the plane of the traveling spots oflight, I show the screen this still leaves the greater of the two evils uncorrected.

I therefore provide lenses-of different focal lengths corresponding with the, relative distances between the different lines traced on the picture display 'mentiberand the light source. V

In practice, where the light units forming the pictures are thrown onto a screen to be viewed from the same side, it is preferable to position the light source 5 on a horizontal plane not higher than that of the lowest aperture of the cycle or series, which accordingly calls for the functioning of the lensof shortest focal length employed, in tracing the bottom line, each of the succeeding lenses being of a different and correspondingly increased focal length, reaching the maximum with the other extreme lens of the cycle functioning at the top or opposite extreme of the illuminated area of the screen element, it being perfectly feasible, however, to scan the picture area by lines progressing either from the top downward or in the opposite direction, or in any other order by a corresponding adaptation of the elements.

Through adaptations of the devices and methods outlined, the screened and assembled picturemay be at an elevation making the picture visible above the plane of the mechanism and housing, or still higher if, desired.

In this adaptation, the screen member may be adjustably supported as an element of the device or it may be sustained by separate means or hung on a wall at proper distance.

In an adaptation of the principle and de-.

vice where it is preferable to direct the lines of light and reconstruct the picture for display on a member of translucent nature, to be viewed from't-he back, so to speak, the light source 5 may be positioned on a plane equi-.

distant between that of the extreme apertures of the cycle,as shown in Fig.1, the lenses increasing in focal length both ways from the basic plane of the light source, although the scanning and re-assembling of the picture may take place in successive lines either from top or bottomor in accordance with the order of line scanning employed in transmission of the image or object being received and reassembled for observation. In the process illustrated, it is obvious to those versed in the art that lenses of condensing type or of different combinations may be employed between the modulated light source and the path of the lens studded apertures de: scribed, or between the path of the apertures and thepicture display member, but I have not deemed it necessary'to show them in the drawing for the reason that it would not be practicable to illustrate all of the various types and combinations of lenses feasible for the purpose. Y

It is also be understood that instead of a single lens sustained in line with each aperture of the rotatable carrier member, I may employ .a plurality of lenses in connection with each aperture so selected and positioned relatively as to perform the, functions outlined herein.

Having thus described illustrative embodiments of my; invention without, however,

limiting the same thereto, what Iclaim and desire to secure by Letters Patent 1s:

1. In a television receiver a rotatable member of drum type provided in its peripheral scanning employed in transmission with means sustaining unlike lenses of different focal lengths in line with each aperture for directing and focusing the light from a modulated light source onto a picture assembling and display member in parallel lines, the picture display member being curved one way in the direction of the said rotatable drum.

3. In a television receiver a horizontally rotatable member of drum type provided in its peripheral section with a convolution of apertures arranged in accordance with the order of line scanning employed in transmission with means sustaining unlike lenses in line with'each aperture, the lenses increasing in focal length in accordance with the increased distance between a modulated light source and parallel lines directed onto a horizontally curved picture assembling and display member. j

4. In a television receiver a horizontally rotatable member of drum type provided in its peripheral casing with a convolution of apertures arranged in accordance with the order of line scanning employed in transmission, means sustaining a lens in line with each of said apertures, a modulated light source positioned on one side of the path of said apertures and a horizontally curved picture assembling and display member on the other side, the said lenses being unlike and of different focal lengths in accordance with the relative distance between the said light source and the different horizontal lines of light traced and focused on the said picture display member by each lens in the order ar ranged.

5. In a television receiver, in combination, a rotatable member of drum type provided in its peripheral region with a convolution of apertures arranged in the order of line scanning employed in transmission, means sustaining unlike lenses of different focal lengths in line with each of said apertures, a modulated light source directed onto one side of the apertures as they pass a given area, a one way curved picture assembling and display member positioned to receive the modulated light in condensed form in parallel lines as focused thereon by the said lenses in succession, the lenses being of different focal lengths in accordance with the distance between each one and the line focused by it v and traced on the said display member.

6. In a television receiver, a horizontally rotatable member of drum type provided in ranged in accordancewith'the order of line scanning employed in transm1ss1on,.means sustaining unlike lenses in line with each of 7 said apertures, a horizontally curved picture display member of translucent nature positioned on one side of the path of said apertur'es and a modulated light directed onto them from the other side, the lenses being of different focal length in accordance with the distance from the llght source to lines focused by each lens in turn onto the said picture display member and traced thereon in horizontal lines in the order arranged.

7. In a television receiver, a rotatable member of drum type provided in its peripheral section with apertures arranged in accordance with the order of line scanning employed in transmission, means sustaining unlike lenses in line with each of said apertures,

a picture assembly and display member of translucent nature positioned 'to be traced by parallel lines of light focused thereon by each of said lenses in single order from a modulated light source, the said lenses being of different focal lengths in accordance with the distance between the said light source and the respective lines traced on the said display member. a

8. In a television receiver a rotatable member provided in its peripheral section with a convolution of apertures arranged in the order of line scanning employed in transmission with means sustaining in line with each aperture unlike lenses of different focal lengths, the lenses being deleted on their sides adjacent to one another.

CALLO D. FAHRNEY.

in its peripheral section with apertures ar-