検出レンズ、レンズユニット、光ピックアップ装置、光ディスク装置、コンピュータ、光ディスクプレーヤ及び光ディスクレコーダ

Japanese Patent JP6074814

B2

The present application discloses detection lens provided with lens portion and flange portion including first surface connected to lens portion and second surface opposite to first surface. Flange portion includes base along optical axis of lens portion, and first to fourth projections projecting from base. First and second projections are point-symmetric around optical axis. Third and fourth projections are point-symmetric around optical axis. Flange portion excludes projection extending beyond second surface. First projection includes first intersecting surface which intersects with first axis. Second projection includes second intersecting surface which intersects with first axis. Third projection includes third intersecting surface which intersects with second axis. Fourth projection includes fourth intersecting surface which intersects with second axis. First distance between first and second intersecting surfaces is longer than second distance between third and fourth intersecting surfaces.

WO/2018/142877	LIGHT INFORMATION PROCESSING DEVICE
JPH11501433	INDUSTRIAL APPLICABILITY: A multi-ray optical storage device including a solid-state laser.
JP4171378	Spherical aberration correction method for recording optical discs, optical disc recording / playback methods and optical disc devices

Shun Yasushi Tanaka
Terahara Noriaki
Takeshi Ota
Hatanaka Shinsuke
Yamazaki Buncho

JP2013528152A

February 08, 2017

December 20, 2012

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Panasonic IP Management Co., Ltd.

G11B7/1378; G11B7/08

JP2007080318A
JP2006059421A
JP61258336A
JP2005116045A

Etsushi Kotani
Masataka Otani
Kohei Watanabe

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