JPS62138317U - - Google Patents

Info

Publication number
JPS62138317U
JPS62138317U JP2348686U JP2348686U JPS62138317U JP S62138317 U JPS62138317 U JP S62138317U JP 2348686 U JP2348686 U JP 2348686U JP 2348686 U JP2348686 U JP 2348686U JP S62138317 U JPS62138317 U JP S62138317U
Authority
JP
Japan
Prior art keywords
prism
light
focus detection
entering
pickup device
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.)
Pending
Application number
JP2348686U
Other languages
English (en)
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 filed Critical
Priority to JP2348686U priority Critical patent/JPS62138317U/ja
Publication of JPS62138317U publication Critical patent/JPS62138317U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Optical Elements Other Than Lenses (AREA)

Description

【図面の簡単な説明】
第1図は本考案の一実施例を示す焦点検出用プ
リズムの概略図、第2図は本考案にかかる焦点検
出用プリズムを光ピツクアツプ装置に適用した概
略図、第3図は従来の実施例を示す概略図、第4
図AないしCはナイフエツジ法による焦点検出の
ための模式図である。 12…焦点検出用プリズム、13…入反射面、
14…光線通過面、15…稜線、16…半導体レ
ーザ、21…情報記録担体。

Claims (1)

    【実用新案登録請求の範囲】
  1. 半導体レーザから出射した光線を情報記録担体
    に照射し、その反射光を、ナイフエツジ機能を備
    えた焦点検出用プリズムを介して合焦点位置に収
    束させるようにした光ピツクアツプ装置において
    、上記焦点検出用のプリズムの光線入射側に設け
    られる入反射面と、この入反射面の後方側に設け
    られる光線通過面とが交わつて形成される稜線が
    ナイフエツジ端を構成するように、上記光線通過
    面を、光軸線から所定角度逃がして形成してなる
    ことを特徴とする光ピツクアツプ装置の焦点検出
    用プリズム。
JP2348686U 1986-02-20 1986-02-20 Pending JPS62138317U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2348686U JPS62138317U (ja) 1986-02-20 1986-02-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2348686U JPS62138317U (ja) 1986-02-20 1986-02-20

Publications (1)

Publication Number Publication Date
JPS62138317U true JPS62138317U (ja) 1987-09-01

Family

ID=30821828

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2348686U Pending JPS62138317U (ja) 1986-02-20 1986-02-20

Country Status (1)

Country Link
JP (1) JPS62138317U (ja)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127935A (en) * 1981-01-28 1982-08-09 Sharp Corp Pickup device
JPS59195330A (ja) * 1983-04-20 1984-11-06 Matsushita Electric Ind Co Ltd 光学ヘツド

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57127935A (en) * 1981-01-28 1982-08-09 Sharp Corp Pickup device
JPS59195330A (ja) * 1983-04-20 1984-11-06 Matsushita Electric Ind Co Ltd 光学ヘツド

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