JPS54127339A - Condensing lens for video discs - Google Patents
Condensing lens for video discsInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-03-27 JP JP3409478A patent/JPS54127339A/en active Pending
Cited By (3)
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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