Image-wise exposure apparatus and image displaying apparatus

Details Image-wise exposure apparatus and image displaying apparatus Image-wise exposure apparatus and image displaying apparatus

1997-03-28

1998-05-26

Mathews, A. A.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347241, 349 2, G03B 2732

Patent

active

057574103

ABSTRACT:
An image-wise exposure apparatus comprises a light source for producing recording light, to which a photosensitive material is to be exposed, and a spatial modulation device, which is provided with an array of picture elements and carries out spatial modulation of the recording light. A shifting device changes the optical relationship between the spatial modulation device and the photosensitive material. In cases where the number of exposure dots formed on the photosensitive material is increased by a factor of m with a picture element shifting step carried out with respect to a certain array direction of the picture elements, and the period, with which periodical nonuniformity in image density obtained by exposure occurs with respect to the array direction of the picture elements when the shifting step is not carried out, is n times as long as the pitch between the picture elements, the distance of shift of the picture elements with respect to the array direction of the picture elements is set to be approximately (n.+-.1)/m times as long as the pitch between the picture elements.

REFERENCES:
patent: 4198158 (1980-04-01), Knowlton
patent: 5047789 (1991-09-01), Kanayama et al.
patent: 5109290 (1992-04-01), Imai
"O plus E" Magazine, Oct. 1994, pp. 90-94.

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