Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1988-09-01
1990-01-30
Ng, Jin F.
Facsimile and static presentation processing
Facsimile
Recording apparatus
350 367, 250213VT, H04N 314
Patent
active
048977306
ABSTRACT:
An image pickup device comprises an image pickup tube and an index generator having a light shield box; a light emitting diode held in the light shield box; a stripe screen provided on the photosensitive layer of the image pickup tube and shading compensation filter having transmittance pattern which equalizes illuminance variation on the stripe pattern of the stripe screen caused by the light emitting diode so that illuminance at any point of the stripe pattern becomes uniform. The image pickup tube generates picture signal together with index signal which is derived from the projected stripe pattern image on peripheral portion of the photosensitive layer through the shading compensation filter which equalizes index signal output level to make timing derived from the index signal accurate. A method of providing shading compensation filter is disclosed where a sheet of negative film is placed on the opening of the light shield box, exposed to the light emitting diode. Then the sheet of film is developed by chemical process.
REFERENCES:
patent: 4564893 (1986-01-01), Myrman
patent: 4605606 (1986-08-01), Ferrante
patent: 4620221 (1986-10-01), Takanashi et al.
patent: 4667245 (1987-05-01), Matsumoto et al.
patent: 4736243 (1988-04-01), Takanashi et al.
Ichimura Horosi
Iwahara Makotoi
Katase Wataru
Nakagaki Shintaro
Negishi Ichiro
Haghani Mehdi
Ng Jin F.
Victor Company of Japan Ltd.
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