JPS57192915A - Objective lens for reproducing video disk or the like - Google Patents

Objective lens for reproducing video disk or the like

Info

Publication number
JPS57192915A
JPS57192915A JP7793481A JP7793481A JPS57192915A JP S57192915 A JPS57192915 A JP S57192915A JP 7793481 A JP7793481 A JP 7793481A JP 7793481 A JP7793481 A JP 7793481A JP S57192915 A JPS57192915 A JP S57192915A
Authority
JP
Japan
Prior art keywords
lens group
lens
focus side
objective lens
lenses
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
JP7793481A
Other languages
Japanese (ja)
Other versions
JPS612926B2 (en
Inventor
Norikazu Arai
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP7793481A priority Critical patent/JPS57192915A/en
Publication of JPS57192915A publication Critical patent/JPS57192915A/en
Publication of JPS612926B2 publication Critical patent/JPS612926B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances

Landscapes

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

Abstract

PURPOSE:To maintain long operating distance and to compensate a sine condition efficiently in addition to spherical aberration by composing the titled lens system of 3 lenses and adopting a negative meniscus lens for the 1st lens group. CONSTITUTION:The titled objective lens group consists of the 1st lens group of a negative meniscus lens whose concave surface is oriented to the focus side, the positive 2nd lens group and the 3rd lens group of a positive meniscus lens whose convex surface is oriented to the focus side and when the composite focus distance of the whole system and the radius of curvature of the 1st lens in the close focus side are (f) and r2 respectively, 0.6f<r2<1.4f should be satisfied. When the interval between the 1st and 2nd lenses and the focal length of the 1st lens group are d2 and f1 respectively and d2/¦f1¦<0.5 is satisfied, Ander's higher order spherical aberration is compensated and the curve of the since condition is more improved. In figure, the 4th optical element is a cover glass.
JP7793481A 1981-05-25 1981-05-25 Objective lens for reproducing video disk or the like Granted JPS57192915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7793481A JPS57192915A (en) 1981-05-25 1981-05-25 Objective lens for reproducing video disk or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7793481A JPS57192915A (en) 1981-05-25 1981-05-25 Objective lens for reproducing video disk or the like

Publications (2)

Publication Number Publication Date
JPS57192915A true JPS57192915A (en) 1982-11-27
JPS612926B2 JPS612926B2 (en) 1986-01-29

Family

ID=13647906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7793481A Granted JPS57192915A (en) 1981-05-25 1981-05-25 Objective lens for reproducing video disk or the like

Country Status (1)

Country Link
JP (1) JPS57192915A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE48828E1 (en) 2015-01-09 2021-11-23 Largan Precision Co., Ltd. Compact optical system, image capturing unit and electronic device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02148892A (en) * 1988-11-30 1990-06-07 Riken Corp Magnetic shielding material and fixing thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE48828E1 (en) 2015-01-09 2021-11-23 Largan Precision Co., Ltd. Compact optical system, image capturing unit and electronic device
USRE49703E1 (en) 2015-01-09 2023-10-17 Largan Precision Co., Ltd. Compact optical system, image capturing unit and electronic device

Also Published As

Publication number Publication date
JPS612926B2 (en) 1986-01-29

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