US2451832A

US2451832A - Cathode-ray tube support and positioning means

Info

Publication number: US2451832A
Application number: US719809A
Authority: US
Inventors: Donald B Keim
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1947-01-02
Filing date: 1947-01-02
Publication date: 1948-10-19
Anticipated expiration: 1965-10-19

Description

Oct. 19, 1948. D. B. KEIM CATHODE-RAY TUBE SUPPORT AND POSITIONING MEANS Filed Jan. 2, 1947' Inventor Donakzl B. Keirn,

His Attorn ey.

Patented Oct. 19, 1948 -cArnb t gfiwunalsiireditr -mb POSITIONING "Donald B;--Klm, Brmgepofi a implication *raiiiiaiy 2, 1947. s'hi'l fiofiiastid My invention relates to television reeivers and, particularly, to television receivers (if the projection type. It is a primarytbjeet "of my invention to provide improved means for sup porting and adjusting the p'ositiono'f a picture tube in a projection television receiver. In "television receivers which emplo an optical system of the Schmidt type in which the-picture tube of the receiveris positioned above a mirror. it is "essential that the position-of the tube {relafive to the mirror be accurately adjusted for proper focusing of the picture. Accordingly, it is another object of iiiyiriveritidn to provide a newa'nd improved deviceof simple construction and arrangement whereby -a picture tube maybe precisely positioned in three difirent plane's B3! relatively independent =me'ch'a'nis'ms.

'It is a further object of-my invention to pri vide a new and improved. positioning device' er manipulator in which a SIIDDOf-tdfibj'dt nlay be moved in three 'redtilinearl'y disp'osed dire'c- Briefiy stated,in the iIIuStra-teii embodiment of my invention, rpmvide a =mai-ii pu1ator for controlling and supruar-tin'g the picture tube of a projection television receivr and'which is sitsceptible 0f producing thre'e -'slibstaiitially inde pendent movements. A pair of parallel sup ort: ing plates are movable in transverse directidns and a third supporting member is movable in a third direction transverse to the pair of directions, all movements beingobt'ained by rotation of three independently operable dams;

"For a better unti'ersjtanding of mymventizsn, reference may be had to'the folidwingtiesdription taken in connection with 'the' 'accbmpafiixiiig drawing-and its scope will be pointed out in the appended claims. Fig. 1 is a sketch diagrammati'cally illustrating the components of 'a proje'c tion television receiver employing 9. scil'iifiik'it type optical system; Fig. -'-2 is a side eievatie'n View of in'y'positioning device for ainahitiixlatdt; Fig-3 is a "front elevatibn'view'o'f their1'a'riip'1i1after of Fig-2; Fig. 4 is as'ectionalviik of the diiiee df Fig. '3 taken along the lines 4'-*- 4,- Figw 5 is a sectional view taken alo'n'gthe-liris i i of Fig. 2.

Referring now to Fig. 1, 1' have shown the optical components of a projection tleiiision-reoeiVer-Whi'ch comprises a metallic enclosing menibe'l' I having an aperture 2 in its 153513151iiflttfifi th'r'o'ugh which proj'e'ctsa picture tub ,"thefiibe 3 "being supported by my improved niairiiinflhtb'r 4 to be iie'sc'ribed in detail later. "The meters "4 cl ims; (01.

end wall facing a statementsfst'ippfirteii (in are etc-am Smewu the irclasure I.

anti ext 18mg ed a mastery to engage the tifl'ae. The 'cir't'il'a'r P pairallel s'trms "I insulating material maintained in (statements 2} s arranged parallel round the screws 33 employed for supporting the Re'silient washers I v plate 2| from the plate 20. 34 positioned between the heads of the screws 33 and the plate 2| assist insupporting the plate I 2| in an adjusted position. s ularly. t er it movement of the plate 22 relative to the plate 21 by means of cam 30, I provide a plurality of slots 35 in the plate Screws 36' passin through the slots 35 are attached to the plate;2l and resilient washers 31 assist in maintaining the plate 2| in adjusted position.

Fig. 3 likewise shows the mannerin which the bracket 23 is supported'from plate, 22 b'ymeans of screws 38, aswell a'sth holes '39 provided in the supporting plate for attaching the, supporting plate to the enclosing member. I.

In Fig. 4 there is shown a sectional'view taken along the lines 4-4 of Fig. 3; This' fi'gure'illustrates the manner inwhich the cams 2,6, 28, I

are attached, respectively, to the, bracket 23 and plates 20, 2|. Thus, each of the'cams" comprises a base portion 40 having on one side a rivet portion 4| which is attached to the respective supporting plate or bracket." On thefopposite side of the base 40, there is provided a pin 42 which p extends into an eccentric hole in respective cams and provides means ,for rotatingthe respective cams to, obtama reciprocating movement qftheirassociated plates or followers. Each ofth cams includes a flange '43 which: lies between the base portion wand the plate which the cam' is adapt d to reciprocate The flange likewise. iri airit the cam in its associated slotj'n the 1 planei w it reciprocates. I 1 Fig. 4 likewise illustrates thatthefplates'f -ffl are provided withrespective,0ver1apping"aper ture's' 44- -45, the strips 13 extending through, all of these' apertures, The curVedfarmS l B e tend through the aperturesprovided, in;v plates; 20, :"2 i and are attached tometallicfblocks' 41 secured to the rear'surface of theplate 22 screws}? 1 y In Fig. 5 there is illustrated,..the cg'nstruction and relative positions, of -the 1 strips ['3 .and supporting arms 16, together withlt he spacers which guide the ,Strips, l3 in their, longitudinal move-f. ment relative to the L arms l6 cam v 26 1s rotated. In this figure, there is further'illustrated the simplicity of construction of the three cams and followerplate arrangement 'by which the supporting ring 9 and azpictui etube sup ported therein are adjusted in three mutually perpendicular directions. I A, U One of the principal advantages of the manipulator or' positioning device which I provide is the facility with which, by the. rotation of three simple cams, there is obtainedthreeindependent directions of movement, of thepicture tube, This type of mechanism'ofifersdecided advantage in.

positioning a picture tube in a television receiver in that all of thernovements are rectilinear so that adjustment of the focus: of the picture tube 3 relative to the mirror 5 in one direction has no effect on the focus in two transverse directions.

Anotheradvantage of my invention is that long insulating paths are provided between the picture 4 tube with its high potentials and all the mechanisms employed for positioning the tubes for focusing purposes.

While I have shown and described my invention as applied to a particular device, it will be obvious to those skilled in the art that changes and modifications may be made without departing from my invention. I, therefore, aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of my invention.

WhatI claim as new and desire to secure by Letters Patent of the United States is:

1. In a projection television receiver of the type .havinga picture tube and a mirror positioned opposite the fluorescent end wall of said tube, a

plate, a. pair of plates mounted on said supporting plate and parallel therewith, said supporting plate and said pair of plates having overlying apertures, an arm extending through. said apertures and arranged to support said tube, a rotatable cam connected with said arm for. movement of said arm and said tube in a direction perpendicular to said plates, a rotatable cam mounted on said supporting plate for reciprocating the one of said plates adjacent thereto in a direction parallel with said plates, and a rotary cam mounted on said one plate for adjusting the other of said pair of plates in a direction transverse to said last direction.

2. A device forpositioning the cathode ray tube in a television receiver comprising a supporting plate, a pair of plates arranged parallel with said supporting plate, the outer of said plates being supported from the other of said plates and the other of said pair of plates being supported by said supporting plate, and said pair of plates having overlapping apertures therein, an insulating arm extending through said aper tures and engaging said tube, means supported by the outer of said plates for adjusting the position of said arm and said tube in a first direction transverse to said plates, and means supported respectively by said supporting plate and the other of said plates for moving said otherplate and said outer plate in two mutually perpendicular directions transverse to said first direction.

3. In a television receiver of the type having a cathode ray tube and an enclosure for said tube having an aperture therein, means external to said enclosure for insulatingly supporting said tube and adjusting the position of said tube comprising, a pair of metallic plates having aper-,

twomutually perpendicular directions transverse to said first direction.

4. A device for insulatingly supporting and positioning a cathode ray tube of a television receiver comprising a supporting plate, a pair of plates arranged parallel with said supporting plate, rotary cam means positioned between one of said parallel plates and said supporting plate for moving said one plate in a first direction,

rotary cam means positioned between said pair otplates for moving the other of said plates in 5 6 a direction transverse to said first direction, a member attached to said other plate extending PEFERENCES CITED in a direction transverse to said first and second The fOQOWmg references are 0f record 111 t directions, insulating supporting means for said file 0f thls patenti tube attached to said other plate, and rotary 5 UNITED STATES PATENTS cam means connected wlth said member for mov- N mb N D t ing said supporting means in a direction transer ame e 1,634 417 Hyatt Aug. 2 1927 vers to sald first and second dlrectlons.

6 1,673,325 GodIey June 12, 1928 B. Kindleman Oct. 25,

2,424,513 Stephen July 22, 1947