JPH02117719U - - Google Patents

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Publication number
JPH02117719U
JPH02117719U JP2328789U JP2328789U JPH02117719U JP H02117719 U JPH02117719 U JP H02117719U JP 2328789 U JP2328789 U JP 2328789U JP 2328789 U JP2328789 U JP 2328789U JP H02117719 U JPH02117719 U JP H02117719U
Authority
JP
Japan
Prior art keywords
photodetector
light
light diffusion
diffusion means
convergence point
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
JP2328789U
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 JP2328789U priority Critical patent/JPH02117719U/ja
Publication of JPH02117719U publication Critical patent/JPH02117719U/ja
Pending legal-status Critical Current

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  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Description

【図面の簡単な説明】
第１図は本考案による光ピツクアツプのフオー
カスエラー検出装置の光学系の一実施例を示す概
略図、第２図は第１図で用いるビームスポツト検
出器の一実施例を示す概略図、第３図はその信号
検出回路を示す回路図である。 ６……検出器、６ａ，６ｂ……受光面、７……
凹レンズ、９……ビームスポツト、１２，１３…
…加算器。

Claims (1)

    【実用新案登録請求の範囲】
  1. 光デイスク上に光ビームを収束させる手段と、
    該光ビームの反射光を所定の収束点に収束させる
    手段と、該所定の収束点の前方に配置された光拡
    散手段と、該光拡散手段の後方に配置された第１
    の光検出器と、該第１の光検出器上に設けられた
    小型の第２の光検出器とを有する光ピツクアツプ
    のフオーカスエラー検出装置。
JP2328789U 1989-03-01 1989-03-01 Pending JPH02117719U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2328789U JPH02117719U (ja) 1989-03-01 1989-03-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2328789U JPH02117719U (ja) 1989-03-01 1989-03-01

Publications (1)

Publication Number Publication Date
JPH02117719U true JPH02117719U (ja) 1990-09-20

Family

ID=31242145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2328789U Pending JPH02117719U (ja) 1989-03-01 1989-03-01

Country Status (1)

Country Link
JP (1) JPH02117719U (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0713065A (ja) * 1993-03-22 1995-01-17 Philips Electron Nv 自動焦点システムを備えた投射型画像表示装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5987628A (ja) * 1982-11-09 1984-05-21 Seiko Instr & Electronics Ltd 自動焦点装置
JPS6124037A (ja) * 1984-07-13 1986-02-01 Tokyo Electric 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
JPS5987628A (ja) * 1982-11-09 1984-05-21 Seiko Instr & Electronics Ltd 自動焦点装置
JPS6124037A (ja) * 1984-07-13 1986-02-01 Tokyo Electric Co Ltd 光学ヘツド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0713065A (ja) * 1993-03-22 1995-01-17 Philips Electron Nv 自動焦点システムを備えた投射型画像表示装置

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