Image recording apparatus capable of representing half-tones on

Details Image recording apparatus capable of representing half-tones on Image recording apparatus capable of representing half-tones on

1978-07-06

1980-04-15

Shoop, William M.

Photocopying

Including fiber optics

346146, 365118, G03G 1500

Patent

active

041981545

ABSTRACT:
This specification discloses a recording apparatus which is capable of representing half-tones of an image. The apparatus is provided with a device for varying the spot size of a recording beam on a recording medium in accordance with the density information of the image to be recorded in order that the half-tones of the image may be represented by the use of a screen dot system. This device causes aberration to the optical system used therein, to thereby vary the size of the beam spot impinging on the recording medium and if required adjust the quantity of light of the beam to create spots of different diameters. Thus, without relatively increasing the power of the beam, it is possible to provide beam spots of various diameters to thereby enable representation of a half-toned image.

REFERENCES:
patent: 3358081 (1967-12-01), Young et al.
patent: 3660818 (1972-05-01), Amodei et al.
patent: 3736046 (1973-05-01), Zook
patent: 3750189 (1973-07-01), Fleischer
patent: 3898627 (1975-08-01), Hooker et al.

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