JPS6428534A - Curvature radius measuring apparatus and method - Google Patents

Curvature radius measuring apparatus and method

Info

Publication number
JPS6428534A
JPS6428534A JP18216587A JP18216587A JPS6428534A JP S6428534 A JPS6428534 A JP S6428534A JP 18216587 A JP18216587 A JP 18216587A JP 18216587 A JP18216587 A JP 18216587A JP S6428534 A JPS6428534 A JP S6428534A
Authority
JP
Japan
Prior art keywords
curvature
radius
distance
convex
backfocus
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
JP18216587A
Other languages
Japanese (ja)
Other versions
JP2511271B2 (en
Inventor
Hiroaki Shimozono
Hiroshi Sato
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.)
Topcon Corp
Original Assignee
Topcon Corp
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 Topcon Corp filed Critical Topcon Corp
Priority to JP18216587A priority Critical patent/JP2511271B2/en
Publication of JPS6428534A publication Critical patent/JPS6428534A/en
Application granted granted Critical
Publication of JP2511271B2 publication Critical patent/JP2511271B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To enable highly accurate measurement regardless of greater radius of curvature in concave and convex surfaces, by substituting a backfocus distance and a specified moving distance of a spherical surface to be measured into a specified expression to determine the radius of curvature. CONSTITUTION:In the case of a convex surface, an object 29 to be measured is put on a carrier 26 to be moved and a backfocus distance L to a luminous flux converging point P3 from a lens surface 24a is read with a length measuring device 30 to be stored into a memory means 31. A moving distance S is calculated between a position CP1 where a spherical surface 29a is at the point P3 and a position CP2 where a converging point P4 in reflection back is on the lens surface 24a. The distances L and S are substituted into the following expression of r=2/[1/S-1/(L-S)] to determine the radius of curvature (r) and in the case of a convex surface, the radius of curvature is also determined in the same way. This enables highly accurate measurement of curvature regardless of greater radius of curvature of the concave surface and the convex surface.
JP18216587A 1987-07-23 1987-07-23 Curvature radius measuring device and measuring method Expired - Lifetime JP2511271B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18216587A JP2511271B2 (en) 1987-07-23 1987-07-23 Curvature radius measuring device and measuring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18216587A JP2511271B2 (en) 1987-07-23 1987-07-23 Curvature radius measuring device and measuring method

Publications (2)

Publication Number Publication Date
JPS6428534A true JPS6428534A (en) 1989-01-31
JP2511271B2 JP2511271B2 (en) 1996-06-26

Family

ID=16113488

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18216587A Expired - Lifetime JP2511271B2 (en) 1987-07-23 1987-07-23 Curvature radius measuring device and measuring method

Country Status (1)

Country Link
JP (1) JP2511271B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001235317A (en) * 2000-02-22 2001-08-31 Fuji Photo Optical Co Ltd Apparatus for measuring radius of curvature of optical spherical surface
JP2010019750A (en) * 2008-07-11 2010-01-28 Olympus Corp Curvature radius measuring apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001235317A (en) * 2000-02-22 2001-08-31 Fuji Photo Optical Co Ltd Apparatus for measuring radius of curvature of optical spherical surface
JP2010019750A (en) * 2008-07-11 2010-01-28 Olympus Corp Curvature radius measuring apparatus

Also Published As

Publication number Publication date
JP2511271B2 (en) 1996-06-26

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