摘要:
A post-deflection acceleration type color cathode-ray tube including a shadow mask having on the surface thereof a secondary electron emission preventing layer made of graphite. Such graphite layers may also be applied on the phosphor screen and on the inner surface of the funnel portion of the tube to further improve the secondary electron preventing effect.
摘要:
A solid state color television receiver incorporates a voltage regulating transformer having a filament winding supplying substantially constant operating voltage to the picture tube filament for prolonging picture tube life. Instant play operation is achieved by providing a filament transformer having a high impedance primary winding, connectable in series with the input of the regulating transformer and a secondary winding connected in series with the regulating transformer filament winding. Automatic degaussing of the picture tube is accomplished with a thermal element each time the receiver is switched on from a ''''cold start'''' with a degaussing circuit coupled across the transformer input. The receiver single pole, single throw on-off switch is connected across the primary winding of the filament transformer. When the switch is open, the regulating transformer input and the primary of the filament transformer are in series which substantially reduces the voltage across the regulating transformer input and drops its secondary voltages below operating levels for the television receiver. The filament transformer secondary winding supplies the tube filament with reduced power during standby operation and is ''''poled'''' on the transformer core to generate flux opposing that normally resulting from primary energization, reducing residual current in the degaussing coil and allowing the thermal element to cool.
摘要:
In a shadow mask assembly for use in a color picture tube of the type including a frame, a shadow mask supported by the frame, a bimetal element secured to the frame and a leaf spring secured to the bimetal element, the bimetal element comprises an upper side portion secured to the frame, a lower side portion secured to the leaf spring and a flat step intermediate the upper and lower sides, the width of the intermediate flat step gradually varying from one end to the other end of the step.
摘要:
A color receiving tube having a maximum deflection angle of greater than 90* disposed close to phosphorescent surface, the perforations of the mask being formed as slits arranged in vertical rows, and an electron gun assembly comprised by three unit electron guns disposed in-line on a common horizontal plane. The deflecting portion of the tube, around which is disposed a deflecting device, is formed as a funnel whose cross-sectional configuration gradually varies from that similar to the configuration of the reproduced image to circular.
摘要:
A circuit for selectively producing magnetized areas on a sheetlike magnetizable material utilizing a plurality of magnetic heads adjacent to the magnetizable material. A DC current is first passed through the coils in the heads and then a decreasing AC current is passed through selected coils. The decreasing AC current is produced by a radiant energy controlled resistance in series with the selected coils. A lamp controlled by an RC circuit illuminates the radiant energy controlled resistance to produce the decreasing AC current.
摘要:
The electron gun unit housed in a neck portion of a tube envelope consists of three electron guns corresponding to red, green and blue. The electron gun corresponding to blue is smaller in diameter than the remaining electron guns, and the axes of said electron guns are arranged to form an isosceles triangle in such a manner that the electron gun having a small diameter has its axis on the apex of the isosceles triangle. Fluorescent dots upon which electron beams emitted from said electron guns impinge are substantially in the form of thin rectangles or ellipses which extend substantially at right angles to the beam scanning direction. Adjacent to said fluorescent dots is disposed a shadow-mask having a plurality of rectangularly shaped beam passing holes.
摘要:
Cooperating means formed between a temperature compensating member having an expansion loop and a sidewall of a parallax barrier are provided to insure centering of the loop within a preformed opening in the barrier sidewall. The cooperating means comprise protruding portions and matching receiving openings therefor, either of which may be formed on either member with the mating portion formed on the other member.
摘要:
Cooperating means formed between a temperature compensating member having an expansion loop and a sidewall of a parallax barrier are provided to insure centering of the loop within a preformed opening in the barrier sidewall. The cooperating means comprise protruding portions and matching receiving openings therefor, either of which may be formed on either member with the mating portion formed on the other member.
摘要:
A shaped beam tube is described wherein a mesh is provided adjacent a trim aperture to diffuse the beam (which is utilized to flood the shaping aperture) and to produce a substantially uniform intensity over the cross section of the beam.
摘要:
A grid structure for color picture tubes adapted to decrease undesirable deviation of electrons away from the phosphor screen of a color picture tube. The slits between the grid wires are formed narrower at the upper and lower portions and wider in the central portion to increase the fundamental vibration frequency and increase the electron beam transmission factor. The latter grid structure eliminates the deleterious effects of (a) grid vibration caused by accidental impact and (b) earth magnetism.