JPS6428532A - Measurement for back focus distance of optical system - Google Patents

Measurement for back focus distance of optical system

Info

Publication number
JPS6428532A
JPS6428532A JP18216687A JP18216687A JPS6428532A JP S6428532 A JPS6428532 A JP S6428532A JP 18216687 A JP18216687 A JP 18216687A JP 18216687 A JP18216687 A JP 18216687A JP S6428532 A JPS6428532 A JP S6428532A
Authority
JP
Japan
Prior art keywords
lens
luminous flux
reflection mirror
flux
converging
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
JP18216687A
Other languages
Japanese (ja)
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 JP18216687A priority Critical patent/JPS6428532A/en
Publication of JPS6428532A publication Critical patent/JPS6428532A/en
Pending legal-status Critical Current

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  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To measure a back focus distance with a high accuracy, by determining and doubling a moving distance of a reflection mirror until a converging point of a converging luminous flux reaches the surface of a lens on the luminous flux outgoing side in an optical system to be measured with the movement of the mirror starting from a position at which the reflecting surface of the reflection mirror is located at the converging point of the luminous flux in the optical system being measured. CONSTITUTION:A luminous flux from a laser beam source 21 is made incident into a convex lens 24 as optical system to be measured and the luminous flux converged passing through the lens 24 is reflected with a reflection mirror 40, which is moved along the optical axis thereof. It is so arranged that a reflecting surface 40a of the reflection mirror 40 gets at a converging point P3 of a luminous flux with the lens 24 while the reflection mirror 40 approaches the lens 24 so that the converging luminous flux is reflected with the reflection mirror 40 before the convergence of the converging flux to shaft a luminous flux converging point P4 to the surface 24a of the lens on the flux outgoing side of the lens 24. Thus, a moving distance l of the reflection mirror 40 is determined until the luminous flux converging point P4 reaches the surface 24a of the lens 24 on the flux outgoing side thereof from a position where the reflection surface 40a is located at the flux converging point P3. This distance l is doubled thereby enabling highly accurate measurement of a back focus distance L.
JP18216687A 1987-07-23 1987-07-23 Measurement for back focus distance of optical system Pending JPS6428532A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18216687A JPS6428532A (en) 1987-07-23 1987-07-23 Measurement for back focus distance of optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18216687A JPS6428532A (en) 1987-07-23 1987-07-23 Measurement for back focus distance of optical system

Publications (1)

Publication Number Publication Date
JPS6428532A true JPS6428532A (en) 1989-01-31

Family

ID=16113504

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18216687A Pending JPS6428532A (en) 1987-07-23 1987-07-23 Measurement for back focus distance of optical system

Country Status (1)

Country Link
JP (1) JPS6428532A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008107274A (en) * 2006-10-27 2008-05-08 Olympus Corp Device for measuring focal position

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008107274A (en) * 2006-10-27 2008-05-08 Olympus Corp Device for measuring focal position

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