Objective lens for optical disk

Details Objective lens for optical disk Objective lens for optical disk

1985-02-12

1986-09-23

Corbin, John K.

350414, G02B 1318, G02B 2102

Patent

active

046132120

ABSTRACT:
An objective lens for an optical disk, particularly a lens of the type which is directly driven for tracking will suffice to be satisfied with a spherical aberration and additional sine conditions. However, it is required that working distance is long and cost is low. These requirements are satisfied by designing an objective lens as a single lens, selecting a shape and thickness of the lens and making one surface thereof aspherical.
Let r.sub.1 be the radius of curvature of the lens surface, n the refractive index, f the focal distance, NA the numerical aperture and .DELTA. the displacement of surface due to aspherical surface, the condition is given by ##EQU1##

REFERENCES:
patent: 2388119 (1945-10-01), Burch
patent: 4027952 (1974-06-01), Hugues
patent: 4449792 (1984-05-01), Arai et al.

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