Abstract:
In a color cathode-ray tube, the effective area (P1) of the panel is formed to be smaller than panel projected area (Pp) of the apertured area of the shadow mask (M in Fig. 8). The effective area (P1) of the panel having straight outlines and right-angled corners to form a rectangular shape, and each of apexes thereof coincides with that of the panel projected area (Pp). To obtain the above rectangular effective area (P1), the present invention adopts means (M1 in Fig. 7 or M2 in Fig. 8) for restricting exposing extent between the light source (S in Fig. 7 or 8) and the panel, in the exposure of black matrix (8). The black matrix (B) is exposed through the shadow mask (M) and further restricted by an auxiliary mask. The phosphors (R, G, B) are exposed without this auxilliary during the manufacture.
Abstract:
A process is disclosed for use in the manufacture of a color cathode ray tube having a rectangular flat faceplate. The process comprises positioning the faceplate in a predetermined x-y plane by referencing faceplate a-b-c reference areas on two adjacent edges or sides of the faceplate with complementary a-b-c reference points on a faceplate locating fixture; the fixture also has three spaced six-point precision indexing means. With the faceplate a-b-c reference areas and the faceplate locating fixture a-b-c points mutually referenced, six-point precision indexing means are attached to the faceplate in registration with the precision indexing means on the faceplate locating fixture. Using the precision indexing means attached to the faceplate, a shadow mask is registered with the faceplate through the use of complementary precision indexing means to provide a faceplate shadow mask assembly in mutual precise registry. Using the registered faceplate-shadow mask assembly, a pattern of phosphors is photodeposited on the faceplate by photoexposure means. The registry of the pattern of phosphors and the shadow mask is accomplished according to the invention with a precision made possible by the use of the six-point precision indexing means, and the location of the patterns on the faceplate is made possible by the use of the a-b-c referencing of the faceplate and the faceplate locating fixture.
Abstract:
This invention relates to a reusable factory fixture frame (82) and process for using same in the manufacture of a color cathode ray tube (20) having a flat faceplate (24) and a tensed foil shadow mask (50). The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse (122). The frame (82) comprises generally rectangular frame means and quick-release mechanical mask-retaining means (88) for temporarily and removably supporting an in-process shadow mask in tension. The frame (82) includes a generally rectangular frame structure having grooves (24) thereabout for receiving an edge (26) of the shadow mask. The mask retaining means (88) may comprise spring-loaded mechanical mask-retaining devices (18) which are secured to the side of the factory fixture frame or quick-release mechanical spring clips (34) for temporarily and removably supporting the in-process shadow mask in tension in the grooves. Alternatively at least one elongate rod-like (28) member extending lengthwise of and complementarily mating with the grooves in the frame structure may be employed for temporarily and removably supporting an in-process shadow mask in tension. The shadow mask is heated and allowed to expand prior to being temporarily and removably supported on the frame, and the shadow mask is allowed to cool and shrink in tension while so being supported to effect tensing of the shadow mask in clamped condition on the frame. Preferably, the frame has at least first six-point indexing means (132) on a first side (84) for registration with complementary registration-affording means (134) on an exposure lighthouse (122), and second six-point indexing means (136) on a second, opposed side (118) for registration with complementary registration-affording means (138) on an in-process faceplate (120). As a result, the in-process shadow mask can be precisely registered and re-registered with the lighthouse (122) and the in-process faceplate (120) for the photoexposure of the in-process faceplate while retaining the in-process shadow mask in tension.