Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting
Patent
1986-12-18
1988-03-22
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Identifying, composing, or selecting
355 55, 369 45, G03B 2752
Patent
active
047332778
ABSTRACT:
An optical unit for focusing light on an optical disk in which laser light from a semiconductor laser is passed through a parallelpiped having a diffracting grating on its incident side before being focused on the optical disk. The angle, contained in the plane of the semiconductor laser's junction, between the grating's normal and the optical axis of the laser light is adjusted to a predetermined value.
REFERENCES:
patent: 3833769 (1974-09-01), Compaan et al.
patent: 4525625 (1985-06-01), Abe
patent: 4633455 (1986-12-01), Hudson
Asahi Kogaku Kogyo Kabushiki Kaisha
Wintercorn Richard A.
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