Two-element f.theta. lens group capable of correcting leaning of

Details Two-element f.theta. lens group capable of correcting leaning of Two-element f.theta. lens group capable of correcting leaning of

1982-11-22

1986-02-18

Corbin, John K.

350 68, G02B 302, G02B 2717

Patent

active

045710350

ABSTRACT:
An f.theta. lens is provided for use in an optical scanner including a deflection unit for deflecting a beam of light at substantially uniform angular rate, first optics for causing the inciddence of a beam which is elliptical in cross section and has a principal axis substantially parallel to a deflecting plane defined by the deflection unit and adapted to be focused in a direction orthogonal to the principal axis, a surface being scanned, and second optics having an f.theta. characteristic for focusing the beam onto the surface and causing it to scan the surface substantially at uniform rate as the beam is deflected by the deflection unit. The two-element lens group includes a meniscus single lens having an f.theta. characteristic and having a positive power and having its concave surface directed toward the deflection unit. Also included is a cylindrical lens having a positive power in a plane perpendicular to the deflecting plane.

REFERENCES:
patent: 4294506 (1981-10-01), Hattori

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