JPS54127339A - Condensing lens for video discs - Google Patents

Condensing lens for video discs

Info

Publication number
JPS54127339A
JPS54127339A JP3409478A JP3409478A JPS54127339A JP S54127339 A JPS54127339 A JP S54127339A JP 3409478 A JP3409478 A JP 3409478A JP 3409478 A JP3409478 A JP 3409478A JP S54127339 A JPS54127339 A JP S54127339A
Authority
JP
Japan
Prior art keywords
lens
formula
conditions
curvature
focal length
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
JP3409478A
Other languages
Japanese (ja)
Inventor
Atsuo Goto
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP3409478A priority Critical patent/JPS54127339A/en
Publication of JPS54127339A publication Critical patent/JPS54127339A/en
Pending legal-status Critical Current

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  • Optical Head (AREA)
  • Lenses (AREA)

Abstract

PURPOSE: To considerably reduce focal length and make the lens system small in size and light in weight by letting the relation between the radii of curvature and focal lengths of lenses satisfy certain conditions with the condensing lens comprising combination of convex lenses and concave lenses.
CONSTITUTION: The lens system is constituted by the 1st lens of a biconvex lens, the 2nd lens of a negative lens whose concave face is faced to the 1st lens side, the 3rd lens of a viconvex lens and the 4th lens of a positive meniscus lens. Here, if the focal length of the entire system is let to be f, the radius of curvature of face on the 2nd lens side to be r2, the radius of curvature of face of the 1st lens side of the 2nd lens to be r3, the radii of curvature of both faces of the 4th lens to be r7, r8 respectively and the focal length of the 3rd lens to be f3, then the formula-I, formula- II, formula-III, formula-IV are satisfied. Namely, the formula-I is the conditions for correcting spherical aberrations, the formula-II the conditions for maintaining sine conditions, the formula-III the conditions for corresting astigmatism and the formula-IV the conditions relating to working distance.
COPYRIGHT: (C)1979,JPO&Japio
JP3409478A 1978-03-27 1978-03-27 Condensing lens for video discs Pending JPS54127339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3409478A JPS54127339A (en) 1978-03-27 1978-03-27 Condensing lens for video discs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3409478A JPS54127339A (en) 1978-03-27 1978-03-27 Condensing lens for video discs

Publications (1)

Publication Number Publication Date
JPS54127339A true JPS54127339A (en) 1979-10-03

Family

ID=12404676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3409478A Pending JPS54127339A (en) 1978-03-27 1978-03-27 Condensing lens for video discs

Country Status (1)

Country Link
JP (1) JPS54127339A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332442A (en) * 1979-05-04 1982-06-01 Olympus Optical Co., Ltd. Reproducing objective for video disks
US4368957A (en) * 1980-10-31 1983-01-18 Discovision Associates Wide aperture objective lens
US4523817A (en) * 1981-11-18 1985-06-18 Olympus Optical Co., Ltd. Lens system for optically recorded disks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332442A (en) * 1979-05-04 1982-06-01 Olympus Optical Co., Ltd. Reproducing objective for video disks
US4368957A (en) * 1980-10-31 1983-01-18 Discovision Associates Wide aperture objective lens
US4523817A (en) * 1981-11-18 1985-06-18 Olympus Optical Co., Ltd. Lens system for optically recorded disks

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