Objective lens for optical pickup apparatus

Details Objective lens for optical pickup apparatus Objective lens for optical pickup apparatus

1996-11-15

1998-11-17

Font, Frank G.

Optical: systems and elements

Lens

With light limiting or controlling means

369112, G02B 900, G11B 700

Patent

active

058385029

ABSTRACT:
An optical pickup apparatus including an improved objective lens having at least one ring-shaped mask for preventing aberrations caused by differences in the thickness of discs being reproduced. The objective lens is capable of achieving improved focus by removing aberrations which occur when reading data from discs having different recording densities and thicknesses. The masks formed in the objective lens has a predetermined mask radius (r.sub.n +1) and a predetermined mask width (.DELTA.r.sub.n +1).

REFERENCES:
patent: 2655077 (1953-10-01), Bennett
patent: 3764198 (1973-10-01), Hunzinger
patent: 5161040 (1992-11-01), Yokoyama et al.
patent: 5615199 (1997-03-01), Tatsuno et al.
patent: 5629799 (1997-05-01), Maruyama et al.
patent: 5644413 (1997-07-01), Komma et al.
patent: 5646928 (1997-07-01), Wu et al.
"Increase of MTF (Modulation Transfer Function) of aberration system based on an aperture modulation" New Physics (Korean Physical Society) vol. 27, No. 1, Feb. 1987.
"Effects of phase modulations to MTF of optical system," New Physics (Korean Physical Society) vol. 30, No. 6, Dec. 1990.

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