US1980406A

US1980406A - Television apparatus

Info

Publication number: US1980406A
Application number: US653842A
Authority: US
Inventors: Sr Philip P Holzer
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-01-27
Filing date: 1933-01-27
Publication date: 1934-11-13
Anticipated expiration: 1951-11-13

Description

P. P. HOLZER, SR

TELEVISION APPARATUS Nov; 13, 1934.

2 Sheets-Sheet .Filed Jan. 27, 1933 Patented Nov. 13, 1934 UNITED STATES PATENT v OFFICE 1 Claim.

i: ject the elimination of various light absorbing elements, such as prisms, mirrors, etc., ordinarily employed in television receivers.

Among other objects, the present invention is v intended to provide a novel arrangement of the scanning light or glow lamp with respect to the scanning disc.

Another object of the invention is to pro-vide novel synchronizing means operatively related to the scanning disc.

A further object of the invention is to provide a scanning disc having greater capacity. for the transmission of image signals therethrough.

A still further object of the invention is to provide a device which is simple to operate, and also to improve devices of the character described'in sundry details hereinafter referred to and particularly pointed out in the appended claim.

One embodiment of the present invention is shown for illustrative purposes in the accompanying drawings, in which Fig. 1 is a rear view of a portion of television apparatus embodying features of the present invention;

) Fig. 2 is a vertical transverse sectional view of the structure illustrated in Fig. l, and taken substantially as indicated by the line 2-2 thereof; Fig. 3 is a fragmentary transverse sectional view taken substantially as indicated by the line 3-3 of Fig. 2; and

Fig. 4 is a scanning band employed for straight line scanning, and illustrating my improved arrangement of glow lamp with respect thereto.

The illustrative embodiment of the present invention comprises a scanning member shown, in the present instance, as a rotatable disc 5 having a plurality of series of scanning holes 6 formed therein, the series of holes, in the present instance, being three in number, and each containing sixteen holes'spaced along curved lines eccentric to the center line of rotation of the disc 5, thereby providing for curved line scanning, it being understood, however, that the present invention is equally applicable to straight line scanning as may be provided by the use of a scanning drum or a scanning belt, the latter being illustrated in Fig. 4 as a band 5a formed of flexible material trained around rotatable guide pulleys 7 and having a plurality of scanning holes 60, formed therein.

In the embodiment shown in Figs. 1 and 2, the

scanning disc 5 is secured to one end of a motor shaft 8 by which the series of holes 6 formed in the disc are successively rotated or moved past an aperture 9 formed in a diaphragm 11 and a glow lamp or recording tube 12, preferably of the neon type, the tube 12 being mounted on the opposite side of the diaphragm 11 from the disc 5 and supported in inverted position on a bracket 13 suitably mounted in a housing or casing indicated as a Whole by the numeral 14, the lamp 12 being suitably connected by means of conductors 15 with any suitable television receiving circuit (not shown).

The motor shaft 8, in the present instance is rotatably mounted in a motor frame 16, which in turn is rotatably mounted in brackets 17 suitably supported in the housing or casing 14, the motor frame 16 being provided with a plate 18 movable with the frame and formed preferably of insulating material and in which a plurality of arcuate contacts 19 are mounted.

Mounted on one of the bracket members 17 and insulated therefrom are a plurality of brush contacts 21 engageable respectively with the arcuate contacts 19 and connected by means of conductors 22 with a suitable source of electrical energy, it being understood that by reason of the arcuate shape of the contacts 19, the motor frame and plate 18 may be rotated with respect to the brackets 17 while maintaining electrical connection with the source of current supply through conductors 23 operatively connected to the arcuate contacts 19, and conductors 22 connected to the brush contacts 21, thereby providing a flexible arrangement for rotating the scanning disc 5 and permitting the rotation of the motor frame in a manner to synchronize the rotation of the disc 5 and scanning holes 6 with the image signals received by the glow lamp or tube 12, it being further understood that, if desired, the motor for driving the disc 5 may be of the synchronous type for maintaining the rotation of the disc 5 and holes 6 in synchronism with the image signals.

For rotating the motor frame 16, a synchronizing knob or handle 24 may be extended through a front panel 25 of the frame 14 to provide convenient access in synchronizing the scanning holes 6 and image signals, and for preventing accidental rotation or displacement of the motor frame 16 after the device has been synchronized, a friction plate 26 is yieldingly urged against the hub 27, formed on the motor frame, by springs 28 positioned between the plate 26 and a. portion of the panel 25, the plate 26'being secured against rotation by a pin 29 mounted on one of the brackets 1'7 and positioned between a pair of fingers or lugs 31 formed on the plate 26.

For projecting the image signals received by the lamp 12 onto a screen, or the like, (not shown) a plurality of aligned condenser lenses are positioned on the opposite side of the scanning disc 5 from the diaphragm 11 and lamp 12 and in substantial alignment with the lamp, aperture 9 of the diaphragm and path of rotation of the series of holes 6'formed in the disc, the condenser in the present instance comprising a plane-convex lens 32 and a converging concavo-convex lens 33 spaced from each other, and having a double convex lens 34 positioned between the lenses 32 and 33, the condenser structure being mounted in a .tube 35 having a plurality of teeth 36 in one side thereof adapted to be engaged by a pinion 37 mounted on a rotatable shaft 38, on which is also secured a handle or adjusting knob 39 by which the pinion may be rotated in a manner to properly focus the image signals on the screen.

Itwill be observed from the foregoing description that the present invention provides a structure where, by arranging the glow lamp in inverted position with respect to the apparatus and scanning disc 5, the image signals may be transmitted to the screen in upright normal position, thereby avoiding the use of light absorbing elements, such as prisms, mirrors, etc., ordinarily used for reversing the image signals, and permittingthe use of a lower grade of glow lamp than is now required.

It will be observed also that the present invention provides novel means for bringing'the rotation of the disc 5 and scanning holes 6 formed thereinin synchronism with the image signals received by the lamp 12.

It has been determined that the holes 6 in the scanning disc 5 may vary in size from one-sixteenth inch to nine-sixteenths inch in diameter,

thereby permitting free passage of image signals therethrough, and that by reason of the movable arrangement of the condenser lenses, the image signals may be focused to the proper size on the screen.

In the structure illustrated in Fig. 4, a glow lamp or neon tube 12a may be arranged in inverted position between the pulleys '7 and within the band 5a in a manner to project the image signals received by the tube through the scanning holes 6a in much the same manner as illustrated in Figs. 1 and 2.

1 I Obviously, the present invention is not limited to the precise construction, arrangement and combination of parts shown and described as the same maybe variously modified. Moreover, all the features of the invention need not be used conjointly as the same may beused to advantage in variously different combinations and sub-combinations.

What I claim as new and desire to secure by Letters Patent is:

In an apparatus of the class described, the combination of a rotatable scanning disc having a plurality of series of scanning holes formed therein and substantially uniformly spaced along a plurality of annularly spaced lines eccentric with the centerline, of rotation of said disc, said holes being of a uniform diameter between nine sixty-fourths and nine sixteenths of an inch, a glow lamp radially spaced from said center line and in inverted position with respect to the apparatus, a diaphragm having an unobstructed aperture formed therein between said disc and lamp, and a plurality of operatively aligned condenser lenses at the opposite side of said disc from said lamp and in alignment therewith and with the aperture formed in said diaphragm and the path of rotation of said series of holes formed in said disc.

PHILIP P. HoLzEasR.