Lens changeable image scanner and lens position control device i

Details Lens changeable image scanner and lens position control device i Lens changeable image scanner and lens position control device i

1996-02-01

1997-03-11

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

355 61, G02B 2608

Patent

active

056107552

ABSTRACT:
A lens position control mechanism and method in an image scanner converts a reading line density by changing over lenses. A base rotatable in a plane parallel to an original table is provided, and the lenses are supported on the base so that their optical axes are in a plane parallel to the base surface and intersect each other at a pivot. A proper kind of lens can be arranged at a proper position by controlling the rotation of the base in such a manner that a reference pattern is provided at a position at which it is readable by an image receiving element through the lens and a lens existing in an optical path is judged on the basis of a received image of the reference pattern to confirm the position of the lens. Thereby, an image scanner capable of changing over lenses at a high precision can be obtained without increasing the height of the image scanner.

REFERENCES:
patent: 3741647 (1973-06-01), Harris
patent: 4050780 (1977-09-01), Wei et al.
patent: 4266855 (1981-05-01), Mohn
patent: 4870453 (1989-09-01), Shimizu et al.

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