Optical pickup device including a hologram lens section with an

Details Optical pickup device including a hologram lens section with an Optical pickup device including a hologram lens section with an

1998-01-12

2000-04-25

Henry, Jon

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 19, 359565, 359571, 359574, 369 4423, 369112, G02B 532, G02B 518, G11B 712

Patent

active

060550767

ABSTRACT:
A two-focal-point pickup device capable of suppressing the generation of glitch or bump in reproduced signal. The optical pickup device irradiates a light beam emitted from a light source onto an optical recording medium to form a light spot on a track of a recording surface of the optical recording medium to read the optical recording medium while controlling the position of the light spot relative to the track of the recording surface. The optical pickup device includes a converging lens section coaxially disposed in an optical axis of the light beam to converge the light beam onto the recording surface; and a hologram lens section coaxially disposed in the optical axis of the light beam to diffract the light beam. The hologram lens section has a diffraction grating pattern being formed in such a manner that a first-order diffraction light of the light beam caused by the hologram lens section and converged on the recording surface has a first numerical aperture existing in a direction intersecting the track extending direction and a second numerical aperture existing in the track extending direction. The first numerical aperture is less than the second numerical aperture.

REFERENCES:
patent: 5107477 (1992-04-01), Fujita et al.
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5377177 (1994-12-01), Horinouchi et al.
patent: 5473471 (1995-12-01), Yamagata et al.
patent: 5490133 (1996-02-01), Nakamura et al.
patent: 5835283 (1998-11-01), Yamanaka
patent: 5838496 (1998-11-01), Murayama et al.
patent: 5920537 (1999-07-01), Komma et al.
Japanese Patent Application Kokai No. 7-98431--an English translation of the Abstract (Apr. 1995).

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