JPS561910A - High resolving power lens - Google Patents

High resolving power lens

Info

Publication number
JPS561910A
JPS561910A JP7885479A JP7885479A JPS561910A JP S561910 A JPS561910 A JP S561910A JP 7885479 A JP7885479 A JP 7885479A JP 7885479 A JP7885479 A JP 7885479A JP S561910 A JPS561910 A JP S561910A
Authority
JP
Japan
Prior art keywords
group
formulas
concave
directed
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.)
Pending
Application number
JP7885479A
Other languages
Japanese (ja)
Inventor
Fumio Kondo
Michitaka Seya
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.)
Tokyo Optical Co Ltd
Original Assignee
Tokyo 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 Tokyo Optical Co Ltd filed Critical Tokyo Optical Co Ltd
Priority to JP7885479A priority Critical patent/JPS561910A/en
Publication of JPS561910A publication Critical patent/JPS561910A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the lens which may be used for information reading from a video disc or the like, is wide in information read range and is inexpensive by reducing its size and weight, increasing its working distance, increasing its numerical aperture and maintaining a high resolving power.
CONSTITUTION: This is constituted by a concave or convex meniscus lens 1 being the 1st group of which the concave face is directed to the image side, a biconvex lens 2 being the 2nd group, a concave meniscus lens 3 being the 3rd group of which the concave face on the stronger side is directed to the 2nd group, and a convex meniscus lens 4 being the 4th group of which the convex face is directed to the 3rd group by leaving some air spacing. Various conditions based on formulas 1W9 are satisfied. The formulas 1W4 are the conditions necessary for distributing the diopters of the respective lenses, the formula 5 is the conditions necessary for maintaining the working distance long, the formulas 3, 6, 7 are spherical aberration and sinewave conditions, and the formulas 8, 9 negate and balance the astigmatisms produced in the 2nd group. Here, (f) in the formulas is the combined focal length of the lenses, R1WR7 are the radii of curvature, D1, D5 are the central thicknesses of the lenses, D2, D4, D6 are axial spacings and N is refractive index.
COPYRIGHT: (C)1981,JPO&Japio
JP7885479A 1979-06-21 1979-06-21 High resolving power lens Pending JPS561910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7885479A JPS561910A (en) 1979-06-21 1979-06-21 High resolving power lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7885479A JPS561910A (en) 1979-06-21 1979-06-21 High resolving power lens

Publications (1)

Publication Number Publication Date
JPS561910A true JPS561910A (en) 1981-01-10

Family

ID=13673403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7885479A Pending JPS561910A (en) 1979-06-21 1979-06-21 High resolving power lens

Country Status (1)

Country Link
JP (1) JPS561910A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5818282U (en) * 1981-07-29 1983-02-04 三洋電機株式会社 light emitting diode display device
JPS6125491A (en) * 1984-07-12 1986-02-04 Kanegafuchi Chem Ind Co Ltd N-carbamoyl-d-naphthylglycine and its preparation
US9214954B2 (en) 2014-03-25 2015-12-15 International Business Machines Corporation Increasing speed of data compression

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5818282U (en) * 1981-07-29 1983-02-04 三洋電機株式会社 light emitting diode display device
JPS6339736Y2 (en) * 1981-07-29 1988-10-18
JPS6125491A (en) * 1984-07-12 1986-02-04 Kanegafuchi Chem Ind Co Ltd N-carbamoyl-d-naphthylglycine and its preparation
JPH0542427B2 (en) * 1984-07-12 1993-06-28 Kanegafuchi Chemical Ind
US9214954B2 (en) 2014-03-25 2015-12-15 International Business Machines Corporation Increasing speed of data compression

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