Retrofocus objective lens and optical scanning device provided w

Details Retrofocus objective lens and optical scanning device provided w Retrofocus objective lens and optical scanning device provided w

1989-09-07

1991-01-22

Arnold, Bruce Y.

35016217, G02B 1318, G02B 2744

Patent

active

049866419

ABSTRACT:
An objective lens (20) and an optical scanning device (30, 20, 50) provided with such a lens are described, of which lens both surfaces (22, 23), viewed from the object side, are concave, while the focal length is considerably smaller than its thickness (d) of along the axis and the surface (23) at the image side is aspherical. When using this objective lens, the scanning device may be very compact.

REFERENCES:
patent: 4545653 (1985-10-01), Brenden et al.
patent: 4641929 (1987-02-01), Braat

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