Improvements in and relating to mountings for pick-up tubes in television cameras

摘要

684,034. Cathode-ray tubes. BRITISH BROADCASTING CORPORATION, and PARIS. G. H. Jan. 16, 1951 [Jan, 18, 1950], No. 1372/50. Class 39(i) A mounting for a television pick-up tube, in which electrons from a photo-cathode are focused by lens on to an image screen, comprises a spider having radial lugs fixed to a front support and adapted to support the front end of the tube and the lens. A continuous or a mosaic cathode may be used, and the lens is mounted around the tube neck adjacent the cathode. Front and back machined supports 19, 20 are screwed to side members 21, 22; member 22 is cut away to house the arm which contains the anode gun and extends laterally of the tube. Dimples circularly arranged on the bulbous portion, neck and side arm of the tube register with supports such as rubber pads 25 to permit limited rotation of the tube. A metal magnetic screen, made in two parts, is fitted within the split support 20 so that the pads 25 project through holes therein. A spider 28 carrying an end viewing aperture, has radial lugs 27 which are retained by screws within an annular groove 26 in the support 19 and carries a non-metallic socket 31 which carries the tube neck and the electron lens. Alternatively, the lugs may engage with a circular ridge on the spider. The viewing aperture at the rear end of the socket is surrounded by a flange against which the optically-flat end of the tube neck is held by the contact springs for the photo-electric screen. The spider may project into the aperture in the support 19 and carries a metal magnetic screen which surrounds the tube neck and lens and through which the spider lugs pass. The side arm, containing the gun, and the deflecting coils, together with the metal screen, are held, with the gun focusing coils, in a non-metallic socket 64, Fig. 5, which is secured by a two-part hinged strap 57 to a rotatable arm the spherical bearing surface of which is secured by nut 52 and spring washer 51 through a member 48 to a block 44 by a bolt 46, the head of which is adapted to be a sliding fit in a slot 47 in the block 44. Screws, the heads 45 of which ride in the groove in the support 19, secure the block to a segment 40 which is slidably adjustable on the screw pin 37, Fig. 2. The mounting is located on a carriage by dowels projecting into apertures 65 and locked by tapered pins in holes 66.