公开(公告)号：US1735946A

公开(公告)日：1929-11-19

申请号：US22471027

申请日：1927-10-07

Applicant: BAIRD TELEVISION LTD

Inventor： LOGIE BAIRD JOHN

IPC: H04N3/04

CPC classification number: H04N3/04

公开(公告)号：GB532525A

公开(公告)日：1941-01-27

申请号：GB2141139

申请日：1939-07-24

Applicant: BAIRD TELEVISION LTD ,  KURT ARTHUR RICHARD SAMSON

IPC: H01J29/43

Abstract: 532,525. Cathode-ray tubes. BAIRD TELEVISION, Ltd., and SAMSON, K. A. R. July 24, 1939, No. 21411. [Class 39 (i)] In the production of mosaic electrodes, two or more metals are evaporated in succession on to a support to form a composite layer which is then heated in vacuo to cause the layer to break up into separate particles. The layer may be superficially oxidised before heating. According to one example, a layer of silver is evaporated on to a mica plate until the transparency is reduced to 30-40 per cent. Antimony is then evaporated on to the silver layer until the transparency is reduced to 5-10 per cent. The composite layer is broken up by heating in vacuo to between 400 and 500‹ C., and the mutually insulated particles photo-electrically sensitized as described in Specification 522,752. According to another example, the composite layer consists of an under layer of bismuth and upper layer of silver. The silver layer is oxidised, before heating, by electric discharge in an oxygen atmosphere, and the insulated particles may be sensitized as described in Specification 532,259.

公开(公告)号：GB526320A

公开(公告)日：1940-09-16

申请号：GB804239

申请日：1939-03-13

Applicant: BAIRD TELEVISION LTD ,  ALEXANDER KONSTANTINOVICH DENI ,  JOHN MARTIN SLEEMAN SPEIRS

IPC: C09K11/02

Abstract: 526,320. Ammonium phosphate composition. BAIRD TELEVISION, Ltd., DENISOFF, A. K., and SPEIRS, J. M. S. March 13, 1939, No. 8042. [Class 93] [Also in Group XL] A binder for a luminescent powder consists of ammonium phosphate dissolved in water plus acetone. The salt may be mono-, di-, or tribasic and it can be formed with ortho-, pyro-, or metaphosphoric acid.

公开(公告)号：GB524038A

公开(公告)日：1940-07-29

申请号：GB199739

申请日：1939-01-20

Applicant: BAIRD TELEVISION LTD ,  THOMAS CAYTON NUTTALL

IPC: H04N5/16

Abstract: 524,038. Circuit arrangements for television. BAIRD TELEVISION, Ltd., and NUTTALL, T. C. Jan. 20, 1939, No. 1997. [Classes 40 (iii) and 40 (v)] A circuit arrangement for supplying interrupted potential to a load circuit 19, Fig. 1, especially intended for black level control or D.C. restoration in television comprises a thermionic valve 1, means 2 for supplying negative voltage pulses to the grid of the valve 1, an inductance 5 in the anode circuit of the valve 1, a first rectifier 6 having its cathode connected to the anode of valve 1 and its anode at a lower potential than the potential source 9 for the valve 1, a second rectifier 13 having its anode connected to the anode of the valve 1 by a condenser 12 and its cathode connected to the cathode of valve 1 directly or through a condenser 18, and a resistance 14 in shunt across rectifier 13. If the pulse generator 2 produces pulses at two frequencies, say at line and frame frequency, a diode 10 is inserted in series with the inductance 5 either where shown or at 11. As shown, rectifier 6 receives its voltage through a resistance 8, the same voltage is applied to a screen grid of the valve 1, and a stabilizing condenser 7 is provided. The pulses fed to the grid of valve 1 cause its anode current to vary as shown by lines 1, Fig. 2, producing a cycle of events A, B, C, D. During phase A, while grid of valve 1 is positive, current in inductance 5 gradually rises while current in rectifier 6 falls as shown by the graphs 5, 6 of Fig. 2. During short stage B, at beginning of negative pulse on grid of valve 1, inductance 5 supplies current to load circuit 19 as shown by graph 19 until charge of condenser 12 makes rectifier 13 conductive. During stage C, inductance current dies down through rectifier 13 as shown by graphs 5, 13 while voltage on load circuit is maintained as shown by graph 16. During the short and last stage D, at the end of the negative pulse on the grid of valve 1, the inductance 5 having spent its stored energy, the voltage at 16 on the load circuit falls back to its low level until the beginning of the next negative pulse on the grid of valve 1.

公开(公告)号：GB517598A

公开(公告)日：1940-02-02

申请号：GB2333138

申请日：1938-08-08

Applicant: BAIRD TELEVISION LTD ,  LAWRENCE CRANMER BENTLEY

IPC: G03B21/62

Abstract: 517,598. Projection screens. BAIRD TELEVISION, Ltd., and BENTLEY, L. C. Aug. 8, 1938, No. 23331. [Class 97 (i)] A projection screen comprises two sheets of transparent material, e.g., glass or synthetic resin, each having one dispersive surface, the dispersive surfaces being adjacent. One sheet may have a ground surface, and the other a surface which is ground, irregular, or formed into small pyramids or truncated pyramids. The surfaces may have convex flutings, either arranged vertically on one sheet, and horizontally on the other, or all parallel. The edges of the sheets may be sealed together to prevent foreign matter from getting between them.

公开(公告)号：GB517597A

公开(公告)日：1940-02-02

申请号：GB2333038

申请日：1938-08-08

Applicant: BAIRD TELEVISION LTD ,  GEORGE RICHARD TINGLEY

IPC: H01J29/76

Abstract: 517,597. Cathode-ray tubes. BAIRD TELEVISION, Ltd., and TINGLEY, G. R. Aug. 8, 1938, Nos. 23330 and 27367. [Class 39 (i)] To avoid keystone distortion in a cathoderay tube wherein the screen 13 is inclined to the axis of the first electro-magnetic system 18 giving deflection along one co-ordinate, the deflection in the other co-ordinate produced by the second electromagnet 16 is varied according to the line scanned ; this is obtained by inclined pole pieces 21 on which may be placed coils 22 for compensating any unbalanced D.C. component produced by coil 16. An additional yoke 7 may be used to give further scan amplitude correction ; if increase of gun voltage is used, to compensate for reduction in sensitivity the current through the coil on the yoke 7 may be increased. Specification 463,972 is referred to.

公开(公告)号：GB517483A

公开(公告)日：1940-01-31

申请号：GB2262338

申请日：1938-07-29

Applicant: BAIRD TELEVISION LTD ,  VICTOR ANGEL JONES

IPC: H01J29/18

Abstract: 517,483. Cathode-ray tubes. BAIRD TELEVISION, Ltd., and JONES, V. A. July 29, 1938, No. 22623. [Class 39(i)] A television receiving device comprises a fluorescent screen flooded with ultraviolet light, the temperature of this screen being varied from point to point in accordance with the picture to be received ; in the arrangements described the variations of temperature is produced by electron impact The figure shows an apparatus with a fluorescent screen 2 illuminated from an ultra-violet source 4. On a photo electric cathode 5 is focused a negative image produced on the screen of a cathode ray tube 6, the electron image thus produced is focused on the screen 2.

公开(公告)号：GB517482A

公开(公告)日：1940-01-31

申请号：GB2262238

申请日：1938-07-29

Applicant: BAIRD TELEVISION LTD ,  VICTOR ANGEL JONES

IPC: H01J31/28

Abstract: 517,482. Cathode-ray tubes. BAIHD TELEVISION, Ltd., and JONES, V. A. July 29, 1938, No. 22622. [Class 39 (i)] The light sensitive mosaic 2 is scanned by a beam from a gun 3 and is also flooded with electrons from a secondary emitting electrode 4 which i itself scanned by a bean from a gun 5. The electrode may be a transparent coating on the envelope and i may be of mosaic form it may be made as a grid, the gun 5 being then on the side of the electrode 4 remote from the mosaic 2.

公开(公告)号：GB516637A

公开(公告)日：1940-01-08

申请号：GB1964638

申请日：1938-07-02

Applicant: BAIRD TELEVISION LTD ,  LIONEL REGINALD MERDLER

IPC: H01J29/92

Abstract: 516,637. Cathode-ray tubes. BAIRD TELEVISION, Ltd., and MERDLER, L. R. July 2, 1938, No. 19646. [Class 39 (i)] A cathode-ray tube having a bulb portion 1 containing a screen and a cylindrical neck portion 3 of less diameter than the bulb portion, has a pinch 6 situated in a lateral extension 5 of the tube, no connecting wires being taken out through the end of the neck remote from the screen. A focussing coil 7, which may be partly surrounded by an iron shield, surrounds the neck between the extension 5 and the gun and magnetic deflecting means 8 surround the neck between the extension and the bulb. If electrostatic deflecting means are used the leads therefrom may pass out through the pinch 6. A fluorescent screen 2 is on the-bulb.

公开(公告)号：GB516351A

公开(公告)日：1940-01-01

申请号：GB1825738

申请日：1938-06-20

Applicant: BAIRD TELEVISION LTD ,  VICTOR ANGEL JONES

IPC: H01J31/12

Abstract: 516,351. Cathode-ray tubes. BAIRD TELEVISION Ltd., and JONES, V. A. June 20, 1938, No. 18257. [Class 39(i)] A cathode-ray tube has an optically transparent electrode emitting secondary electrons under the action of a scanning beam, these electrons being accelerated towards and focused on a fluorescent screen arranged on the same side of the secondary-emitting electrode as the means producing the beam. In the form shown, for giving a very bright television picture, the beam from the gun 3 under television signals scans the electrode 4, which is positive with respect to the gun anode, and the resulting secondary electrons from the transparent electrode 4 are focused by a coil 8 on to a screen 6 which is positive with respect to the electrode 4. The image on the screen may be viewed through the electrode 4 or by projection on to a screen to the left-hand side of that electrode. Alternatively, a lens may project the image on to a screen to the right of the screen 6. The electrode 4 may comprise a conductive glass, e.g. one rich in boron silicate, or it may comprise a metal with a thin oxide layer sensitized 'with an alkali metal. Alternatively it may comprise a transparent antimony-calcium alloy oxidized until its photo sensitivity is reduced to zero. Optical transparency of such an alloy is obtained by depositing a sufficiently thin layer of antimony and evaporating calcium in the known manner, the effect of the calcium being to increase the transparency of the layer.