Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1990-10-19

1992-06-23

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, 359209, 250236, 2505781, 346108, 358296, G02B 2610

Patent

active

051248298

ABSTRACT:
The improved light beam scanning apparatus uses a simple and inexpensive focal point adjusting device to adjust the optical path lengths of a plurality of light beams having different wavelengths so that their focal lengths will coincide with each other. This permits not only a number of optical members in the main scanning optics to be used in common for the plurality of scanning beams but also the sub-scanning transport mechanism to be used in common for more than one kind of object to be scanned. Accordingly, the light beam scanning apparatus is compact and inexpensive and yet is capable of scanning to read image information from plural kinds of objects or to record image information on plural kinds of objects or to read and record such information from more than one object to be scanned.

REFERENCES:
patent: 3869193 (1975-03-01), Schmit
patent: 4070089 (1978-01-01), Grafton
patent: 4205350 (1980-05-01), Gunning
patent: 4276473 (1981-06-01), Kato et al.
patent: 4960313 (1990-10-01), Yamanaka

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