Abstract:
This invention provides a photodetector for weak light and a weak light detection system including the photodetector for weak light the photodetector for weak light is comprised of a substrate on which an integrating read circuit including a PIN photodiode or an APD and an FET is mounted, wherein the entire assembly is mounted while separating the substrate from a ground potential without grounding the substrate, such a photodetector for weak light can reduce noise and ensure a high enough sensitivity enough to be able to discriminate the number of photons.
Abstract:
A color cathode ray tube is provided in which an inner radius of curvature is designed as 0.3≦(Rxe/Rxc)≦0.5, to obtain a structural intensity of a panel mask corresponding to the inner curvature of the cathode ray tube panel to decrease partial doming and increase a drop characteristic.
Abstract:
Provided are a photocathode plate capable of stably achieving a high sensitive property, and an electron tube using such a photocathode plate. In a photomultiplier tube 1, an insulating layer 63 is formed between a semiconductor electron emission layer 51 in a photocathode plate 23A, and a first electrode 65 electrically connected to an electron releasing portion 59. This insulating layer 63 permits the photocathode plate 23A to be cleaned by heat cleaning at a high temperature, in a stage before formation of an active layer 61 on an exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59. This makes it feasible to effectively clean the exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59 and to stabilize the physical properties of the exposed region. In consequence, a higher sensitive property can be stably achieved in the photocathode plate 23A and in the photomultiplier tube 1 using the photocathode plate 23A.
Abstract:
A color cathode ray tube is capable of reducing a rate of cracks in a furnace and improving the productivity of the CRT by improving a structure of a seal edge of a skirt of a panel. A color cathode ray tube according to the present invention includes a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel. The seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt, and the following relationship is satisfied: 0.6 mm
Abstract:
A cathode ray tube has a vacuum enclosure including a panel (1) having a screen (1a), a funnel (2) connected to the panel (1), and a neck (3) connected to the narrow part of the funnel (2). The funnel (2) has a yoke-mounting portion (5) on which a deflection yoke (7) is mounted. The sectional shape of the yoke-mounting portion (5), cut by a plane perpendicular to the tube axis of the funnel (2), varies from a circular shape to a substantially barrel shape having a maximum dimension at least in a direction of the horizontal axis or the vertical axis, as the position shifts from the neck (3) side to the panel (1) side of the yoke-mounting portion (5). With such an arrangement, the resistance to the external pressure can be improved, and the deflection power consumption can be reduced.
Abstract:
The present invention relates to a color cathode ray tube and more specifically to a color cathode ray tube in which mechanical stress due to internal pressure made by evacuation is decreased. According to an aspect of the present invention, a cathode ray tube comprises a panel on inner surface of which a phosphor screen is formed; a funnel joined to the panel; an electron gun generating electron beams; and a deflection yoke which is mounted within the funnel to deflect the electron beams, wherein said panel satisfies a condition: L1+(L2−L1)×0.35 ≦L≦L1+(L2−L1)×0.45 wherein L1 is distance between inner center P of said panel and yoke line plane; L2 is distance between the inner center P of said panel and neck line plane; and L is distance between the inner center P of said panel and reference line plane.
Abstract:
An optical filter comprises a transparent support and a filter layer. The filter layer has an absorption maximum in the wavelength range of 500 to 550 nm. The filter layer further has another absorption maximum in the wavelength range of 560 to 620 nm. The optical filter has a transmittance in the range of 40 to 85% at the absorption maximum in the wavelength range of 500 to 550 nm. The optical filter further has a transmittance in the range of 0.01 to 80% at the absorption maximum in the wavelength range of 560 to 620 nm.
Abstract:
A second film that contains a substance that secures the conductivity of conductive particles is formed on a first film that contains the conductive particles. The first film and the second film are sintered at the same time. Thus, a conductive anti-reflection film having a sufficiently low surface resistance with a sufficient transmissivity for a high transparency can be obtained with high cost performance. When the conductive anti-reflection film is used for a cathode ray tube, it can almost prevent the AEF (Alternating Electric Field), display a picture in high quality, and be excellent in cost performance.
Abstract:
A vacuum envelope includes a flat face plate having a phosphor screen formed on the inner surface of the face plate, and a flat rear plate opposed to the face plate with a side wall interposed therebetween. A plurality of funnels extend from the rear plate, and electron guns are respectively enclosed in the necks of the funnels. The rear plate and the plurality of funnels are integrally formed of one single plate glass and are joined to face plate through the side wall. A plurality of reference surfaces are formed on the inner surface of the rear plate, and ends of the plate support members are respectively fixed to the reference surfaces.
Abstract:
A method for forming a silica film on a face panel is disclosed. The method includes steps of preparing a first composite having a staring material of a silica-titania two component system where alcohol is added as a catalyst; preparing a second composite having a titaniumalkoxide or a derivative of the titaniumalkoxide as a catalyst; mixing the first and second composites at a predetermined ratio; agitating the face panel; and calcinating the coated colloidal solution at a temperature of 160-200.degree. C. The silica-titania two-component system is selected from a group consisting of a tetraethyl-silicate and a tetraethyl-silicate oligomer. The tetraethyl-silicate oligomer has a degree of polymerization of 40, 51 or 56.