Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-09-26
1988-06-28
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350571, 358250, G02B 1318, G02B 2700, H04N 572
Patent
active
047535199
ABSTRACT:
An optical system for projection television apparatus has three projection cathode-ray tubes for producing red, green and blue monochrome images, respectively. Three projection lens systems are disposed in front of faceplates of the projection cathode-ray tubes, respectively for producing the red, green and blue screen, each of the projection lens systems having a rear lens element having a negative power and disposed in front of a corresponding one of the cathode-ray tubes and a front group having a positive power and disposed in front of the rear lens element, the rear lens element having a concave surface facing the front group. In each of at least two of the three projection lens systems, the optical axis of the front group is tilted to that of the rear lens element, and the optical axis of the rear lens element is in parallel with or aligned with that of the corresponding one of the projection cathode-ray tubes.
REFERENCES:
patent: 1848402 (1929-10-01), Wollensak
patent: 3972584 (1976-08-01), Lobb
patent: 4051513 (1977-09-01), Takeuchi et al.
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
Corbin John K.
Kachmarik Ronald M.
Matsushita Electric - Industrial Co., Ltd.
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