US2275229A - Television apparatus - Google Patents

Description

March 3, 1942. A. MORCH ETAL 2,275,229

TELEVISION APPARATUS Filed May 22, 1940 Fig. 1

Ami/2012 y Mari/1 Ja/m Marc/2 IN VEN TOR.

Patented Mar. 3, 1942 UNITED STATES PATENT OFFICE TELEVISION APPARATUS Anthony Merck and John Morch, Jamaica, N. Y.

Application May 22, 1940, Serial No. 336,665

1 Claim.

The invention relates to improvements in television apparatus generally and more particularly to certain of the instrumentalities'employed in image reception and display.

In television receivers now available to the general public, particularly those for use in private .homes, there are certain disadvantages and disquieting faults present which are due, primarily, to the more or less embryonic development of the art and to the need of the manufacturer to produce receivers with a price range that will quickly create a fairly wide market for them. In these receivers, the received images are usually to be viewed through a framed opening or Window in the front wall of a cabinet direct from the image screen of the cathode-ray receiving tube, with the result that the image is much too small for clear and easy observation and, more often than not, Will appear obscure and distorted, due to the small size of the receiving tube employed; the image screen of which usually having an effective image area of less than five inches in height and width.

It is therefore among the several objects of the invention to provide a method and means, that will be effective in reducing, if not entirely overcoming, the aforesaid disadvantages and faults, without adding appreciably to the manufacturing costs of television receiver sets in which the disclosed improvements are incorporated.

Another of the objects of the invention is to effectively increase the visibility of received images and to eliminate distortion and obs'cureness therefrom, by enlarging the received image without correspondingly increasing the size of the cathode-ray receiving tube usually employed.

Still another object of the invention has to do with the provision of a means for effectively enlarging the image received on the screen of a cathode-ray receiving tube by effecting a transfer of the image from the tube screen to a viewing screen of a proportionately larger area, without employing a projecting media for the purpose.

With these and other objects and advantages of equal importance in view, the invention resides in the certain new and useful combinations, constructions, and arrangements, that will be hereinafter more fully described, set forth in the appended claim, and illustrated in the accompanying drawing, in which:

Figure 1 is a vertical section through a conventional television receiver cabinet, showing a cathode-ray receiving tube assembly therein, in accordance with the instant invention;

Figure 2 is an enlarged vertical longitudinal section through the cathode-ray receiving tube assembly as in Figure 1; and

Figure 3 is a vertical transverse section taken on the line 3-3 of Figure 2.

Referring to the drawing, wherein like characters of reference designate corresponding parts in the related views thereof, and more particularly to Figures 1 to 3, inclusive, I denotes the evacuated envelope of a cathode ray receiving tube which has a usual multi-pronged connector at its smaller end for engagement with a companion connector Ia forming the terminal of a suitable electric current supply. The tube I is mounted for endwise movement at the upper end of a support 5a rising from the bottom wall of a television receiver cabinet -5, for the focusing adjustment of the image screen Ib, forming the end wall of itslarger end, relatively to the image viewing opening or window in the front wall of the cabinet 5.

In accordance with the present invention, with a cathode-ray receiving tube having a five inch image receiving screen forming its larger end wall, the viewing opening or window in the front wall of the cabinet 5 will be made to a size to receive an observation lens or screen 6, for instance, one foot square. This lens or screen 6 is preferably convex in form and will be framed within the opening or window and mounted in the larger end of an inwardly tapering housing part 3 that is telescopically engaged by .a similarly tapered part 2 which is carried by the cathoderay receiving tube I in a manner to enclose the larger end portion thereof. A clamp means 4 is positioned on the smaller end portion of the tube I and engages the smaller end of the telescopic housing part 2 to hold it in fixed position. Thus, by adjusting the tube I on the support 5a, the image screen I a thereof may be readily brought into focus relatively to the enlarging lens or screen 6, as will be obvious. Also, the housing part 2 is adjustable relatively to the tube I by loosening up on holding screws 4a carried by the clamp means 4, which adjustment admits of the positioning of the same and the tube for proper and efiicient cooperation with the lens screen 6.

In this instance of the invention, the wall at the larger end of the cathode-ray receiving tube I is preferably made substantially fiat and of plain clear glass, with its inner surface provided with a coating of any suitable or usual fluorescent materials, as at Id, necessary for the reproduction thereon of an image by the electronic beam or the tube. The image on the screen Id will be transferred through the telescopic housing for viewing at the front of the enlarging lens screen I and, as a consequence of the proportionately greater area of the latter, the image will be to be understood that it is subject to modification and minor changes in detail of construction and arrangement of parts, without departing from the spirit of invention or the scope thereof as claimed.

What we claim, is:

The combination with a radio receiver cabinet having a sight opening for exposure of television images therethrough, an enlarging lens closing said sight opening, an open-ended housing extending within said cabinet from about said sight opening and said lens, said housing being constituted in complementally tapered sections adapted for length adjustment telescopically, a support within said cabinet, and a cathode-ray receiver tube movably mounted on said support and having its larger end enclosed within the free end of the smaller movable section of said housing, said receiver tube being adjustable on said support and relatively to and with said smaller housing section to position the image screen of the receiver tube in optical focus with 20 said lens.

ANTHONY MORCH. JOHN MORCH.

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