GB2010478A - Method and Apparatus for Testing Lenses - Google Patents

Method and Apparatus for Testing Lenses

Info

Publication number
GB2010478A
GB2010478A GB7848863A GB7848863A GB2010478A GB 2010478 A GB2010478 A GB 2010478A GB 7848863 A GB7848863 A GB 7848863A GB 7848863 A GB7848863 A GB 7848863A GB 2010478 A GB2010478 A GB 2010478A
Authority
GB
United Kingdom
Prior art keywords
lens
grating
photodiode
sensed
indicate
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.)
Withdrawn
Application number
GB7848863A
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.)
Kodak Ltd
Original Assignee
Kodak 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 Kodak Ltd filed Critical Kodak Ltd
Priority to GB7848863A priority Critical patent/GB2010478A/en
Publication of GB2010478A publication Critical patent/GB2010478A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0285—Testing optical properties by measuring material or chromatic transmission properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

In a lens testing apparatus for lenses having a large depth of field, an optical grating 6 is positioned in the film plane of the lens 3 being tested. A rotating perforated mask, 12 (also Fig. 2 not shown) produces scanning images on the grating 6 which are sensed by a photodiode 7. The scanning performed at a first effective distance and at a second effective distance by means of a beam combiner 15 containing a convex 17 and a concave lens 16 Fig. 3. Signals proportional to the light intensities are sensed through the grating for the two scanning images and are combined (Fig. 4 not shown) to provide an indication of a lens characteristic. The signals are added to indicate lens sharpness, and are subtracted to indicate the distance at which the lens is focused. A "go/no go" indicator may be used for sorting. The apparatus shown in Figure 1 is intended to include a sensing unit 4 combining the grating 6 and the photodiode 7 which replaces the film cartridge in a camera and operates during normal shutter opening. <IMAGE>
GB7848863A 1977-09-16 1978-12-18 Method and Apparatus for Testing Lenses Withdrawn GB2010478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7848863A GB2010478A (en) 1977-09-16 1978-12-18 Method and Apparatus for Testing Lenses

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3876177 1977-09-16
GB7848863A GB2010478A (en) 1977-09-16 1978-12-18 Method and Apparatus for Testing Lenses

Publications (1)

Publication Number Publication Date
GB2010478A true GB2010478A (en) 1979-06-27

Family

ID=26263905

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7848863A Withdrawn GB2010478A (en) 1977-09-16 1978-12-18 Method and Apparatus for Testing Lenses

Country Status (1)

Country Link
GB (1) GB2010478A (en)

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)