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WO2009044671A1 - 対物レンズ - Google Patents

対物レンズ Download PDF

Info

Publication number
WO2009044671A1
WO2009044671A1 PCT/JP2008/067430 JP2008067430W WO2009044671A1 WO 2009044671 A1 WO2009044671 A1 WO 2009044671A1 JP 2008067430 W JP2008067430 W JP 2008067430W WO 2009044671 A1 WO2009044671 A1 WO 2009044671A1
Authority
WO
WIPO (PCT)
Prior art keywords
objective lens
thickness
reproducing
satisfying
thin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/067430
Other languages
English (en)
French (fr)
Inventor
Katsunari Sonoda
Masaru Nakayama
Hiroshi Kameda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of WO2009044671A1 publication Critical patent/WO2009044671A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Optical Head (AREA)

Abstract

　像高特性が良好であり、作動距離やコバ厚をある程度取りながらレンズ厚をできるだけ小さくした対物レンズを提供する。光記録媒体の記録再生に用いられる対物レンズであって、互いに対向する第１面と第２面のうち少なくとも一面が非球面に形成され、下記の式を満たすことを特徴とする対物レンズ。ｔ＜１．１・ｆかつ、ｔ＞１．５２・ｆ－０．７９（ただし、ｔ：対物レンズの軸上厚さ、ｆ：対物レンズの焦点距離）
PCT/JP2008/067430 2007-10-01 2008-09-26 対物レンズ Ceased WO2009044671A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007257201A JP2010281847A (ja) 2007-10-01 2007-10-01 対物レンズ
JP2007-257201 2007-10-01

Publications (1)

Publication Number Publication Date
WO2009044671A1 true WO2009044671A1 (ja) 2009-04-09

Family

ID=40526100

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/067430 Ceased WO2009044671A1 (ja) 2007-10-01 2008-09-26 対物レンズ

Country Status (2)

Country Link
JP (1) JP2010281847A (ja)
WO (1) WO2009044671A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012048768A (ja) * 2010-08-24 2012-03-08 Konica Minolta Opto Inc 光ピックアップ装置用の対物レンズ及び光ピックアップ装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027183A (ja) * 2008-07-24 2010-02-04 Hoya Corp 光情報記録再生装置用対物レンズ、および光情報記録再生装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0772386A (ja) * 1993-06-23 1995-03-17 Asahi Glass Co Ltd 光ディスク用対物レンズ
JPH0829682A (ja) * 1994-12-19 1996-02-02 Konica Corp 光情報記録媒体の記録再生用対物レンズ
JP2003077171A (ja) * 2001-08-13 2003-03-14 Samsung Electronics Co Ltd 光ピックアップ装置及びこれに適用される記録媒体
JP2003091854A (ja) * 2001-09-18 2003-03-28 Pentax Corp 光ヘッド用対物レンズおよびこれを用いた光ヘッド
JP2003107341A (ja) * 2001-09-28 2003-04-09 Pentax Corp 光ピックアップ用対物光学系
JP2008123573A (ja) * 2006-11-08 2008-05-29 Hitachi Maxell Ltd 光ピックアップレンズ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0772386A (ja) * 1993-06-23 1995-03-17 Asahi Glass Co Ltd 光ディスク用対物レンズ
JPH0829682A (ja) * 1994-12-19 1996-02-02 Konica Corp 光情報記録媒体の記録再生用対物レンズ
JP2003077171A (ja) * 2001-08-13 2003-03-14 Samsung Electronics Co Ltd 光ピックアップ装置及びこれに適用される記録媒体
JP2003091854A (ja) * 2001-09-18 2003-03-28 Pentax Corp 光ヘッド用対物レンズおよびこれを用いた光ヘッド
JP2003107341A (ja) * 2001-09-28 2003-04-09 Pentax Corp 光ピックアップ用対物光学系
JP2008123573A (ja) * 2006-11-08 2008-05-29 Hitachi Maxell Ltd 光ピックアップレンズ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012048768A (ja) * 2010-08-24 2012-03-08 Konica Minolta Opto Inc 光ピックアップ装置用の対物レンズ及び光ピックアップ装置

Also Published As

Publication number Publication date
JP2010281847A (ja) 2010-12-16

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