JPS56634A - Mtf measuring unit for half-lens - Google Patents

Mtf measuring unit for half-lens

Info

Publication number
JPS56634A
JPS56634A JP7643579A JP7643579A JPS56634A JP S56634 A JPS56634 A JP S56634A JP 7643579 A JP7643579 A JP 7643579A JP 7643579 A JP7643579 A JP 7643579A JP S56634 A JPS56634 A JP S56634A
Authority
JP
Japan
Prior art keywords
lens
inspected
chart
frequency
mtf
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
JP7643579A
Other languages
Japanese (ja)
Inventor
Takashi Yokota
Nobuo Sakuma
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7643579A priority Critical patent/JPS56634A/en
Publication of JPS56634A publication Critical patent/JPS56634A/en
Pending 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
    • G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function

Landscapes

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

Abstract

PURPOSE:To facilitate measuring operations by arranging a frequency chart and a solid scanning element at a distance of the double of the approximate focal length from an inspected half-lens. CONSTITUTION:Inspected half-lens L is set, and illumination lamp 4 is caused to emit light. When the light from lamp 4 illuminates frequency chart 10 through support plate 5, the euqual-size image of frequency chart 10 and so on is focused onto the light receiving region of corresponding solid scanning element 20 and so on due to the focusing function of lens L; and when element 20 and so on perform self-scanning under this state, a vibratory time series electric signal is obtained according to the space frequency of the chart. This signal is input to operation processing part Op. The electric signal is processed in processing part Op by arithmetic operations which consider two kinds of modulation transfer function MTF and are set previously, thereby calculating MTF of the inspected half-lens.
JP7643579A 1979-06-18 1979-06-18 Mtf measuring unit for half-lens Pending JPS56634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7643579A JPS56634A (en) 1979-06-18 1979-06-18 Mtf measuring unit for half-lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7643579A JPS56634A (en) 1979-06-18 1979-06-18 Mtf measuring unit for half-lens

Publications (1)

Publication Number Publication Date
JPS56634A true JPS56634A (en) 1981-01-07

Family

ID=13605065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7643579A Pending JPS56634A (en) 1979-06-18 1979-06-18 Mtf measuring unit for half-lens

Country Status (1)

Country Link
JP (1) JPS56634A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454066A (en) * 2012-06-05 2013-12-18 深圳市豪恩安全科技有限公司 Convex lens focal length detecting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5180110A (en) * 1975-01-08 1976-07-13 Nippon Electric Co ccd rainsensaano hoshiki

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5180110A (en) * 1975-01-08 1976-07-13 Nippon Electric Co ccd rainsensaano hoshiki

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454066A (en) * 2012-06-05 2013-12-18 深圳市豪恩安全科技有限公司 Convex lens focal length detecting device
CN103454066B (en) * 2012-06-05 2016-04-06 深圳市豪恩安全科技有限公司 Focal length of convex lens pick-up unit

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