JPS6157320U - - Google Patents

Info

Publication number
JPS6157320U
JPS6157320U JP14248284U JP14248284U JPS6157320U JP S6157320 U JPS6157320 U JP S6157320U JP 14248284 U JP14248284 U JP 14248284U JP 14248284 U JP14248284 U JP 14248284U JP S6157320 U JPS6157320 U JP S6157320U
Authority
JP
Japan
Prior art keywords
disk
laser beam
information
objective lens
recording
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
JP14248284U
Other languages
Japanese (ja)
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 JP14248284U priority Critical patent/JPS6157320U/ja
Priority to DE3533647A priority patent/DE3533647C2/en
Priority to GB08523253A priority patent/GB2166583B/en
Priority to US06/778,098 priority patent/US4773052A/en
Publication of JPS6157320U publication Critical patent/JPS6157320U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Optical Head (AREA)
  • Lenses (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の光学系の正面図、第２図は従
来の光学系の正面図、第３図はビデオデイスクの
特性図、第４図はデイジタルオーデイオデイスク
の特性図を各々表す。 １……光源、２……コリメートレンズ、３……
ビームスプリツタ、４……対物レンズ、５……デ
イスク、６……集光レンズ、７……受光素子。 FIG. 1 is a front view of the optical system of the present invention, FIG. 2 is a front view of a conventional optical system, FIG. 3 is a characteristic diagram of a video disk, and FIG. 4 is a characteristic diagram of a digital audio disk. 1...Light source, 2...Collimating lens, 3...
Beam splitter, 4...Objective lens, 5...Disc, 6...Condenser lens, 7...Photodetector.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 第１のデイスクと、該第１のデイスクと異なる
フオーマツトで情報が記録再生される第２のデイ
スクとに、該情報をレーザビーム等を用いて光学
的に記録又は再生する光学的情報記録再生装置で
あつて、該第１のデイスクと第２のデイスクに該
情報を記録再生する際該レーザビーム等を該デイ
スク上に収束させる対物レンズの開口数をＮＡ、
該レーザビーム等の波長をλとしたとき、該対物
レンズの実質開口数ＮＡ／λ（μｍ）を０．５７
以上かつ０．６８以下にしたことを特徴とする光
学的情報記録再生装置。 An optical information recording and reproducing device that optically records or reproduces information using a laser beam or the like on a first disk and a second disk on which information is recorded and reproduced in a format different from that of the first disk. The numerical aperture of the objective lens for converging the laser beam, etc. onto the disks when recording and reproducing the information on the first disk and the second disk is NA,
When the wavelength of the laser beam, etc. is λ, the effective numerical aperture NA/λ (μm) of the objective lens is 0.57.
An optical information recording/reproducing device characterized in that it is set to a value of 0.68 or more and 0.68 or less.
JP14248284U 1984-09-20 1984-09-20 Pending JPS6157320U (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP14248284U JPS6157320U (en) 1984-09-20 1984-09-20
DE3533647A DE3533647C2 (en) 1984-09-20 1985-09-20 Optical information recording and playback device
GB08523253A GB2166583B (en) 1984-09-20 1985-09-20 Optical information recording and/or reproducing apparatus
US06/778,098 US4773052A (en) 1984-09-20 1985-09-20 Dual mode disk player/recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14248284U JPS6157320U (en) 1984-09-20 1984-09-20

Publications (1)

Publication Number Publication Date
JPS6157320U true JPS6157320U (en) 1986-04-17

Family

ID=30700806

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14248284U Pending JPS6157320U (en) 1984-09-20 1984-09-20

Country Status (1)

Country Link
JP (1) JPS6157320U (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750335A (en) * 1980-09-09 1982-03-24 Mitsubishi Electric Corp Optical information reproducer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750335A (en) * 1980-09-09 1982-03-24 Mitsubishi Electric Corp Optical information reproducer

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