公开(公告)号：CA924157A

公开(公告)日：1973-04-10

申请号：CA101400

申请日：1970-12-23

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： FUKUMA HIROSHI ,  WATARAI YOSHIAKI ,  OKAMOTO MASAHIRO ,  ASHIZAKI SHIGEYA ,  NINAGAWA CHIKAYOSHI ,  KOBAYASHI YOSHICHIKA

IPC: H01J9/227

Abstract: 1302020 Colour television tubes MATSUSHITA ELECTRONICS CORP 18 Dec 1970 [29 Dec 1969 (2)] 60233/70 Heading H1D In the manufacture of a colour television screen by a photo-resist process the light source is provided by a ring, or by a point source rotating in a ring, the diameter of which is large compared with the diameter of the apertures in the shadow mask through which the photo-sensitive material is exposed. As illustrated in Fig. 5 exposure of an emulsion 9 through the aperture 7 of a shadow mask by an annular light source 12 leaves a sharply defined unexposed central area 14 1 which may be smaller than the aperture 7. If the emulsion contains phosphor and a reversal type photosensitive fixing agent, this process may be used to deposit phosphor dots of one or more colours. Alternativelythe process may be used to deposit an opaque area between the phosphor areas, and in this case the emulsion contains light absorbing material and a positive type photosensitive fixing agent. In Fig. 5 the light source comprises a quartz cylinder provided with a conical recess to leave an annular rim 12 which provides the effective light source when the lower end of the cylinder is illuminated. As an alternative a point source may be rotated in a circle. In one example the inner and outer diameters of the source 12 are are 16À0 and 17À2 mm., the diameter of the aperture 7 is 0À32 mm. and the diameter of the phosphor dot is 0À26 mm.

公开(公告)号：CA923352A

公开(公告)日：1973-03-27

申请号：CA96914

申请日：1970-10-29

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： ASHIZAKI SHIGEYA ,  NINAGAWA CHIKAYOSHI ,  OKAMOTO MASAHIRO

IPC: H01J9/227

Abstract: 1,267,000. Luminescent screens. MATSUSHITA ELECTRONICS CORP. 23 Oct., 1970 [30 Oct., 1969], No. 50515/70. Heading HID. In the manufacture of a multi-dot colour screen by a photoresist process, the light source is annular. In Fig. 4 the light source is a transparent rod 11 illuminated at its lower end by an ultra-violet lamp (not shown) and provided at its top end with a non-emissive conical depression 11 1 surrounded by a circular rim 12. As illustrated, the light from the rim 12 passing through an aperture 7 in a shadow mask on to the emulsion 9 has a maximum intensity in a central area 14 which is separated from the penumbra 14 1 by a sharp boundary 14 11 ; consequently the penumbral regions 14 1 can be dissolved away to leave well-defined circular dot portions of smaller diameter than the apertures 7. The dot diameter is smaller the larger the diameter of the source 12, which may be larger than the diameter of the aperture 7.