JPS562526A - Focus adjusting method of mtf measuring instrument - Google Patents

Focus adjusting method of mtf measuring instrument

Info

Publication number
JPS562526A
JPS562526A JP7857479A JP7857479A JPS562526A JP S562526 A JPS562526 A JP S562526A JP 7857479 A JP7857479 A JP 7857479A JP 7857479 A JP7857479 A JP 7857479A JP S562526 A JPS562526 A JP S562526A
Authority
JP
Japan
Prior art keywords
checked
analog
converting circuit
focus
mft
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
JP7857479A
Other languages
Japanese (ja)
Inventor
Yoshiaki Kamimoto
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 JP7857479A priority Critical patent/JPS562526A/en
Publication of JPS562526A publication Critical patent/JPS562526A/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

Abstract

PURPOSE:To make it easy to adjust a focus by displaying the result of measurement near an axis by an analog meter with regard to MTF instrument that takes the measurement at several points of an optical element to be checked at a time by the use of several solid scanning elements. CONSTITUTION:Light emitted from light source 8 is made even by diffusing plate 14 and light penetrating the chart element of chart plate 10 is image-formed in a black-and-white pattern on CCD 131-139, through lens 4 to be checked, thereby outputting output signals in time series. The output signals pass through an analog multiplexer, A/D converting circuit, arithmetic circuit, digital multiplexer, and D/A converting circuit and then displayed as the arithmetic results of MFT by a display unit under the control of a controller. The arithmetic results of MFT, on the other hand, are converted by the D/A converting circuit into analog signals, which are output to an analog meter. Over a look at the display value, the focus of checked lens 4 can easily be adjusted.
JP7857479A 1979-06-21 1979-06-21 Focus adjusting method of mtf measuring instrument Pending JPS562526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7857479A JPS562526A (en) 1979-06-21 1979-06-21 Focus adjusting method of mtf measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7857479A JPS562526A (en) 1979-06-21 1979-06-21 Focus adjusting method of mtf measuring instrument

Publications (1)

Publication Number Publication Date
JPS562526A true JPS562526A (en) 1981-01-12

Family

ID=13665663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7857479A Pending JPS562526A (en) 1979-06-21 1979-06-21 Focus adjusting method of mtf measuring instrument

Country Status (1)

Country Link
JP (1) JPS562526A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104180971A (en) * 2014-07-24 2014-12-03 青岛歌尔声学科技有限公司 Method and system for obtaining optimal imaging focal length of lens and lens assembling method
WO2021001283A1 (en) * 2019-07-01 2021-01-07 Valeo Vision Projection assembly for a motor vehicle and method for controlling the projection assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51144254A (en) * 1975-06-05 1976-12-11 Kanto Sangyo Kk Focal distance measurement method of optical lens and its device
JPS5349452A (en) * 1976-10-13 1978-05-04 Coulter Information Systems Method and device for testing lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51144254A (en) * 1975-06-05 1976-12-11 Kanto Sangyo Kk Focal distance measurement method of optical lens and its device
JPS5349452A (en) * 1976-10-13 1978-05-04 Coulter Information Systems Method and device for testing lens

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104180971A (en) * 2014-07-24 2014-12-03 青岛歌尔声学科技有限公司 Method and system for obtaining optimal imaging focal length of lens and lens assembling method
WO2021001283A1 (en) * 2019-07-01 2021-01-07 Valeo Vision Projection assembly for a motor vehicle and method for controlling the projection assembly
FR3098279A1 (en) * 2019-07-01 2021-01-08 Valeo Vision Motor vehicle projection assembly and Method of adjusting said projection assembly
CN114026363A (en) * 2019-07-01 2022-02-08 法雷奥照明公司 Projection assembly for a motor vehicle and method for controlling the same
JP2022538893A (en) * 2019-07-01 2022-09-06 ヴァレオ ビジョン Projection assembly for motor vehicle and method for adjusting said projection assembly
US11933469B2 (en) 2019-07-01 2024-03-19 Valeo Vision Projection assembly for a motor vehicle and method for adjusting said projection assembly

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