JPS57125302A - Automatic measuring device of radius of curvature - Google Patents

Automatic measuring device of radius of curvature

Info

Publication number
JPS57125302A
JPS57125302A JP56010108A JP1010881A JPS57125302A JP S57125302 A JPS57125302 A JP S57125302A JP 56010108 A JP56010108 A JP 56010108A JP 1010881 A JP1010881 A JP 1010881A JP S57125302 A JPS57125302 A JP S57125302A
Authority
JP
Japan
Prior art keywords
objective lens
curvature
checked
lens
optical axis
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
JP56010108A
Other languages
Japanese (ja)
Other versions
JPS6343091B2 (en
Inventor
Makoto Uehara
Masao Noda
Shiyuuichi Nakabarai
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP56010108A priority Critical patent/JPS57125302A/en
Publication of JPS57125302A publication Critical patent/JPS57125302A/en
Publication of JPS6343091B2 publication Critical patent/JPS6343091B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

PURPOSE:To measure the curvature of a body to be checked automatically by projecting indexes on the body to be checked by parallel luminous fluxes in the directions which are symmetrical with respect to an optical axis of an objective lens, focusing the index images on an image sensor by the specified objective lens, detecting the interval, and performing computation and processing. CONSTITUTION:Point light sources 10a and 10b are arranged at the symmetrical positions with respect to the optical axis of the objective lens system comprising a front lens 1, a rear lens 2 whose front focal point is the rear focal point of the lens 1, and a stop 3 which is arranged at the focal point. The bright points 10a and 10b are projected on the body to be checked 100 by the parallel luminous fluxes in the directions which form an equal angle theta with the optical axis of the objective lens from projecting lenses 11a and 11b. The reflected image are focused on an image sensor 14 and a reticle 13 through the objective lens and a beam splitter 12. Focusing is performed by an eyepiece lense 13', and the output from the sensor 14 is inputted into a computor 17, through a waveform shaping circuit 16. Then the curvature of the body to be checked 100 is computed and displayed 18. Thus the curvature can be automatically measured.
JP56010108A 1981-01-28 1981-01-28 Automatic measuring device of radius of curvature Granted JPS57125302A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56010108A JPS57125302A (en) 1981-01-28 1981-01-28 Automatic measuring device of radius of curvature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56010108A JPS57125302A (en) 1981-01-28 1981-01-28 Automatic measuring device of radius of curvature

Publications (2)

Publication Number Publication Date
JPS57125302A true JPS57125302A (en) 1982-08-04
JPS6343091B2 JPS6343091B2 (en) 1988-08-29

Family

ID=11741115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56010108A Granted JPS57125302A (en) 1981-01-28 1981-01-28 Automatic measuring device of radius of curvature

Country Status (1)

Country Link
JP (1) JPS57125302A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819225A (en) * 1981-07-29 1983-02-04 マミヤ光機株式会社 Cornea meter
JPS62224350A (en) * 1986-03-25 1987-10-02 キヤノン株式会社 Medical binocular microscope
JPS62290435A (en) * 1986-06-09 1987-12-17 キヤノン株式会社 Cornea shape measuring apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819225A (en) * 1981-07-29 1983-02-04 マミヤ光機株式会社 Cornea meter
JPS628170B2 (en) * 1981-07-29 1987-02-21 Mamiya Camera
JPS62224350A (en) * 1986-03-25 1987-10-02 キヤノン株式会社 Medical binocular microscope
JPH0651023B2 (en) * 1986-03-25 1994-07-06 キヤノン株式会社 Ophthalmic equipment
JPS62290435A (en) * 1986-06-09 1987-12-17 キヤノン株式会社 Cornea shape measuring apparatus
JPH0576293B2 (en) * 1986-06-09 1993-10-22 Canon Kk

Also Published As

Publication number Publication date
JPS6343091B2 (en) 1988-08-29

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