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JPS57136638A - Optical film - Google Patents

Optical film

Info

Publication number
JPS57136638A
JPS57136638A JP2271781A JP2271781A JPS57136638A JP S57136638 A JPS57136638 A JP S57136638A JP 2271781 A JP2271781 A JP 2271781A JP 2271781 A JP2271781 A JP 2271781A JP S57136638 A JPS57136638 A JP S57136638A
Authority
JP
Japan
Prior art keywords
focusing
frame
apq
supplied
pickup device
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
JP2271781A
Other languages
Japanese (ja)
Inventor
Akira Takagi
Akihiko Doke
Shiyuuji Itou
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.)
TOKKYO DEITA CENTER KK
Mitsubishi Electric Corp
Original Assignee
TOKKYO DEITA CENTER KK
Mitsubishi Electric Corp
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 TOKKYO DEITA CENTER KK, Mitsubishi Electric Corp filed Critical TOKKYO DEITA CENTER KK
Priority to JP2271781A priority Critical patent/JPS57136638A/en
Publication of JPS57136638A publication Critical patent/JPS57136638A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading
    • G03B21/115—Projectors with built-in or built-on screen for microfilm reading of microfiches
    • G03B21/116—Handling microfiches

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE:To obtain a frame read by a scanning image pickup device as a clear one by obtaining an focusing state easily by an electric read by providing a focusing pattern around each of many frames. CONSTITUTION:The frame Apq of an optical film is opposed to and read by a scanning image pickup device 51 through an optical lens system 53, and the obtained electric image signal Spq is supplied to a signal processing circuit 53. Further, said signal is supplied to a detecting circuit 54 for pattern information for focusing, and consequently pattern information M'pq for focusing based upon a focusing pattern Mij provided around the frame Apq the image signal Spq has is obtained and supplied to a servomotor 55 through a servoamplifier 58 so that a maximum level is obtained, thus focusing an optical image of the frame Apq on the photoelectric conversion surface of the scanning image pickup device 51.
JP2271781A 1981-02-18 1981-02-18 Optical film Pending JPS57136638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2271781A JPS57136638A (en) 1981-02-18 1981-02-18 Optical film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2271781A JPS57136638A (en) 1981-02-18 1981-02-18 Optical film

Publications (1)

Publication Number Publication Date
JPS57136638A true JPS57136638A (en) 1982-08-23

Family

ID=12090551

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2271781A Pending JPS57136638A (en) 1981-02-18 1981-02-18 Optical film

Country Status (1)

Country Link
JP (1) JPS57136638A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434653A (en) * 1977-08-23 1979-03-14 Olympus Optical Co Ltd Retrieving device for microfilm

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434653A (en) * 1977-08-23 1979-03-14 Olympus Optical Co Ltd Retrieving device for microfilm

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