Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-04-26
1989-08-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 350 65, 346108, H01J 314, G02B 2608, G01D 942
Patent
active
048619833
ABSTRACT:
An optical system, useful for a flying-spot scanning apparatus includes a laser tube, an acousto-optical modulator, a deflecting mirror directing the laser beam in a first direction, and an objective lens having the characteristic of h=f.multidot.sin .theta., where h is the distance on an object between the optical axis and the point upon which the laser beam impinges, f is the focal length of the objective lens and .theta. is the angle formed by the beam entering the objective lens with respect to the optical axis. The objective lens includes a first optical unit having the negative focal length and a second optical unit having a positive focal length. The third-order distortion coefficient of the objective lens is approximately "1". Straight and parallel scanning loci can be effected on a recording medium, as the recording medium is fed in a second direction.
REFERENCES:
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patent: 4248495 (1981-02-01), Minoura
patent: 4318583 (1982-03-01), Goshima et al.
patent: 4343531 (1982-08-01), Tateoka et al.
patent: 4527858 (1985-07-01), Takahashi et al.
patent: 4715699 (1987-12-01), Morimoto
patent: 4756584 (1988-07-01), Takahashi et al.
Hirosawa Makoto
Kishida Yoshihiro
Nagata Shin-ichi
Sasada Shigeru
Dainippon Screen Mfg. Co,. Ltd.
Messinger Michael
Nelms David C.
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