Contact type image sensor comprising a plurality of microlenses

Details Contact type image sensor comprising a plurality of microlenses Contact type image sensor comprising a plurality of microlenses

1996-09-13

1999-03-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25022711, 385120, 358484, H01J 4014, H04N 1028, G02B 604

Patent

active

058774920

ABSTRACT:
A full-contact type image sensor which includes a light source, a plurality of photo-electric conversion elements having apertures, a photoelectric conversion region, a plurality of micro-lenses, and an optical fiber converging member. The light from the light source is allowed to pass solely through the apertures and is blocked by the photoelectric conversion regions. The micro-lenses may be provided in one-to-one correspondence to a plurality of apertures or one-to-one correspondence to a plurality of optical fibers. The micro-lenses may be provided at least at one of a photoelectric conversion element side end and an original document side end of the optical fiber converging member. Instead of using such micro-lenses, the optical fiber converging member may be arranged such that a numerical aperture of the optical fibers at its first region on a side of the photoelectric conversion elements is set to be greater than a numerical aperture of the optical fibers at its second region on a side of the original document. It is possible to provide increased light utilization efficiency.

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N. Daemen et al., "Microlenses for Image Sensors", Phillips Journal of Research, vol. 48, No. 3, 1994, pp. 281-297 (no month).
M. Oikawa et al., "Flat Plate Micro-Lens Arrays", Optical Engineer's Department in the Association of Applied Physics Engineers of Japan, vol. 17, No. 11, 1988, p. 578 (no month).

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