Aspheric object lens for optical data read-out apparatus

Details Aspheric object lens for optical data read-out apparatus Aspheric object lens for optical data read-out apparatus

1986-03-18

1987-06-09

Corbin, John K.

350414, G02B 1318, G02B 2102

Patent

active

046716238

ABSTRACT:
An object lens for use in focusing a laser light beam onto a recording surface in an optical data read-out apparatus, is formed with opposing refracting aspheric surfaces which are shaped in accordance with new aspheric surface equations, whereby the shapes of the aspheric surfaces are simple and readily formed. The thickness of the lens can be made smaller than is possible with prior art types of such lens, although satisfactory values for the degree of aberration correction and focal distance are maintained.

REFERENCES:
patent: 4027952 (1977-06-01), Hugues
patent: 4525040 (1985-06-01), Nakamura
patent: 4595264 (1986-06-01), Nakamura
patent: 4600276 (1986-07-01), Bietry
patent: 4613212 (1986-09-01), Norikazu

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