JPS5774716A - Objective lens for video disk reproduction - Google Patents

Objective lens for video disk reproduction

Info

Publication number
JPS5774716A
JPS5774716A JP55142408A JP14240880A JPS5774716A JP S5774716 A JPS5774716 A JP S5774716A JP 55142408 A JP55142408 A JP 55142408A JP 14240880 A JP14240880 A JP 14240880A JP S5774716 A JPS5774716 A JP S5774716A
Authority
JP
Japan
Prior art keywords
lens
group
constitution
objective lens
biconvex
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.)
Granted
Application number
JP55142408A
Other languages
Japanese (ja)
Other versions
JPS6216410B2 (en
Inventor
Yoji Kubota
Hidetoshi Hadama
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.)
Nidec Instruments Corp
Original Assignee
Sankyo Seiki Manufacturing 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 Sankyo Seiki Manufacturing Co Ltd filed Critical Sankyo Seiki Manufacturing Co Ltd
Priority to JP55142408A priority Critical patent/JPS5774716A/en
Publication of JPS5774716A publication Critical patent/JPS5774716A/en
Publication of JPS6216410B2 publication Critical patent/JPS6216410B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only

Landscapes

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

Abstract

PURPOSE:To obtain a clear objective lens of small-sized, lightweight constitution which has long operation distance, by permitting respective lenses in the 1st group of a biconvex lens and a negative meniscus lens cemented together, in the 2nd group of a biconvex lens and the 3rd group of a positive meniscus lens to meet requirements. CONSTITUTION:An objective lens system consists of a lens L1 constituted by cementing a biconvex lens 1 to a negative meniscus lens 2 having a concave surface on a photodetector side, a biconvex lens L2, and a positive meniscus lens L3 having a concave surface on a video disk side. Conditional inequalities (1)-(4) hold,where the focal lengths of the lens groups L1, L2, and L3, and the entire system are f1, f2 f3, and f, the space distance on the optical axis between the L1 and L2 is d1.2, and the radius of curvature of the cemented surface 3 is r1. Consequently, a semiconductor laser is usable as a light source and the system has small-sized, light- weight constitution, less residual aberrations and long operation distance.
JP55142408A 1980-10-14 1980-10-14 Objective lens for video disk reproduction Granted JPS5774716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142408A JPS5774716A (en) 1980-10-14 1980-10-14 Objective lens for video disk reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142408A JPS5774716A (en) 1980-10-14 1980-10-14 Objective lens for video disk reproduction

Publications (2)

Publication Number Publication Date
JPS5774716A true JPS5774716A (en) 1982-05-11
JPS6216410B2 JPS6216410B2 (en) 1987-04-13

Family

ID=15314639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142408A Granted JPS5774716A (en) 1980-10-14 1980-10-14 Objective lens for video disk reproduction

Country Status (1)

Country Link
JP (1) JPS5774716A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57144512A (en) * 1981-03-03 1982-09-07 Konishiroku Photo Ind Co Ltd Objective lens for reproduction of video disk
US5214537A (en) * 1989-04-11 1993-05-25 Asahi Kogaku Kogyo Kabushiki Kaisha Chromatic aberration correcting objective lens system for information recording/reproducing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57144512A (en) * 1981-03-03 1982-09-07 Konishiroku Photo Ind Co Ltd Objective lens for reproduction of video disk
JPH0434124B2 (en) * 1981-03-03 1992-06-05 Konishiroku Photo Ind
US5214537A (en) * 1989-04-11 1993-05-25 Asahi Kogaku Kogyo Kabushiki Kaisha Chromatic aberration correcting objective lens system for information recording/reproducing apparatus

Also Published As

Publication number Publication date
JPS6216410B2 (en) 1987-04-13

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