Image reader including plural light stopping plates with apertur

Details Image reader including plural light stopping plates with apertur Image reader including plural light stopping plates with apertur

1990-12-14

1992-08-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250237R, 356443, H01J 4014, H01J 314

Patent

active

051421380

ABSTRACT:
An image reader of the present invention is provided with a plurality of photosensitive elements arranged one-dimensionally or two-dimensionally substantially in parallel with an image bearing member, and first and second stopping plates each of which has apertures at positions corresponding to the photosensitive elements, respectively, between the image bearing member and the photosensitive elements. The apertures of the second stopping plate are smaller in size than photosensitive surfaces of the photosensitive elements. The dimension of the apertures, the dimension of the photosensitive surfaces of the photosensitive elements and the distances between the first stopping plate, the second stopping plate and the photosensitive elements are set in a predetermined relation. This prevents the influence of the deviation of a mounting position of the photosensitive elements on a measuring error.

REFERENCES:
patent: 4531062 (1985-07-01), Engemann et al.
patent: 4539482 (1985-09-01), Nose

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