JPS57197404A - Measuring method of radius of curvature - Google Patents

Measuring method of radius of curvature

Info

Publication number
JPS57197404A
JPS57197404A JP56082023A JP8202381A JPS57197404A JP S57197404 A JPS57197404 A JP S57197404A JP 56082023 A JP56082023 A JP 56082023A JP 8202381 A JP8202381 A JP 8202381A JP S57197404 A JPS57197404 A JP S57197404A
Authority
JP
Japan
Prior art keywords
lens
objective lens
curvature
radius
luminance
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
JP56082023A
Other languages
Japanese (ja)
Other versions
JPH0154055B2 (en
Inventor
Masao Noda
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 JP56082023A priority Critical patent/JPS57197404A/en
Priority to US06/379,552 priority patent/US4572628A/en
Publication of JPS57197404A publication Critical patent/JPS57197404A/en
Publication of JPH0154055B2 publication Critical patent/JPH0154055B2/ja
Granted legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To measure the radius of curvature of a body to be inspected simply, by disposing two pairs of projection optical systems at a position of axial symmetry putting the optical axis of an objective lens in-between, projecting a luminance point of the body to be inspected, and forming the image of the luminance point via the objective lens on a photoelectric transducer. CONSTITUTION:A light from two pairs of light sources 1a, 1b and 1c, 1d disposed at a position of axial symmetry to an optical axis 0 of an objective lens 4 is projected on a body E1 to be inspected as a luminance point via pin hole plates 2a-2d on optical axes O1-O4 and collimator lenses 3a-3d. The reflected light of four luminance points is reflected on a beam splitter 5 via the objective lens 4 and formed on a focus plate 8 via an aperture 6 and a lens 7 and observed with eyes E2 via a lens 9. On the other hand, the light transmitted from the beam splitter 5 is formed on a photoelectric transducer 13 via an aperture 10 and a lens 11. The radius of curvature of the body E1 is calculated from the position of four luminance points for simple measurement.
JP56082023A 1981-05-29 1981-05-29 Measuring method of radius of curvature Granted JPS57197404A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56082023A JPS57197404A (en) 1981-05-29 1981-05-29 Measuring method of radius of curvature
US06/379,552 US4572628A (en) 1981-05-29 1982-05-18 Method of and apparatus for measuring radius

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56082023A JPS57197404A (en) 1981-05-29 1981-05-29 Measuring method of radius of curvature

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP3292738A Division JPH0757218B2 (en) 1991-11-08 1991-11-08 Curvature radius measuring device

Publications (2)

Publication Number Publication Date
JPS57197404A true JPS57197404A (en) 1982-12-03
JPH0154055B2 JPH0154055B2 (en) 1989-11-16

Family

ID=13762923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56082023A Granted JPS57197404A (en) 1981-05-29 1981-05-29 Measuring method of radius of curvature

Country Status (1)

Country Link
JP (1) JPS57197404A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05329103A (en) * 1991-07-29 1993-12-14 Topcon Corp Alignment system for ophthalmolog apparatus
US5416538A (en) * 1992-10-29 1995-05-16 Nikon Corporation Object-surface-shape measuring apparatus
JPH09276223A (en) * 1996-04-12 1997-10-28 Nikon Corp Curvature measuring device and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50878A (en) * 1973-05-01 1975-01-07
JPS5414758A (en) * 1977-07-05 1979-02-03 Humphrey Instruments Inc Lens meter using nonnparallel beams
JPS5414757A (en) * 1977-07-05 1979-02-03 Humphrey Instruments Inc Lens meter
JPS558800A (en) * 1978-06-28 1980-01-22 Humphrey Instruments Inc Optical correcting method
JPS5618837A (en) * 1979-07-23 1981-02-23 Canon Kk Keratometer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50878A (en) * 1973-05-01 1975-01-07
JPS5414758A (en) * 1977-07-05 1979-02-03 Humphrey Instruments Inc Lens meter using nonnparallel beams
JPS5414757A (en) * 1977-07-05 1979-02-03 Humphrey Instruments Inc Lens meter
JPS558800A (en) * 1978-06-28 1980-01-22 Humphrey Instruments Inc Optical correcting method
JPS5618837A (en) * 1979-07-23 1981-02-23 Canon Kk Keratometer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05329103A (en) * 1991-07-29 1993-12-14 Topcon Corp Alignment system for ophthalmolog apparatus
JPH08103B2 (en) * 1991-07-29 1996-01-10 株式会社トプコン Alignment device for ophthalmic machine
US5416538A (en) * 1992-10-29 1995-05-16 Nikon Corporation Object-surface-shape measuring apparatus
JPH09276223A (en) * 1996-04-12 1997-10-28 Nikon Corp Curvature measuring device and method

Also Published As

Publication number Publication date
JPH0154055B2 (en) 1989-11-16

Similar Documents

Publication Publication Date Title
CA2346704A1 (en) Device for measuring aberration refraction of the eye
US2701501A (en) Apparatus for testing of centering, coaxiality, alignment
US3932030A (en) Illuminating device in an ophthalmometer
JPS6417623A (en) Alignment apparatus in opthalmic apparatus
JPS57197404A (en) Measuring method of radius of curvature
JPS6465430A (en) Manufacture of measuring device and fiber for transparent object and fiber manufactured thereby
JPS6441805A (en) Position detecting apparatus of two bodies, which are separated by minute distance
JPS57197405A (en) Automatic measuring device for radius of curvature
JPS56160631A (en) Measuring apparatus for thickness and eccentricity of lens or the like
JPS57163839A (en) Lens meter
JPS57154224A (en) Focus detecting device of camera
JPS6488327A (en) Shape measuring method for interference wave front
JPS55140102A (en) Measuring device for flatness of inspected plane glass
SU684296A1 (en) Interferometer for testing quality of optical components
GB773238A (en) Improvements relating to apparatus for indicating small movements
JPS57148709A (en) Focus detecting optical device
JPS60196612A (en) Surface shape measuring apparatus
JPS6456407A (en) Focus detector
SU1661567A1 (en) Method of testing surfaces of optical parts
JPS6480340A (en) Stigmatoscope
JPS56163408A (en) Optical type thickness measuring device
GB570022A (en) A projection system for the inspection of internal surfaces
SU706689A1 (en) Interferometer for quality control of high-aperture concave spherical surfaces
SU1670391A1 (en) Interferometer method of control of concave cylindrical surfaces
GB231848A (en) Improvements in or relating to the polarisation of light