JPS57181538A - Back focus adjusting device of copying machine for film - Google Patents

Back focus adjusting device of copying machine for film

Info

Publication number
JPS57181538A
JPS57181538A JP6599081A JP6599081A JPS57181538A JP S57181538 A JPS57181538 A JP S57181538A JP 6599081 A JP6599081 A JP 6599081A JP 6599081 A JP6599081 A JP 6599081A JP S57181538 A JPS57181538 A JP S57181538A
Authority
JP
Japan
Prior art keywords
sleeves
screws
lens
sleeve
film
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
JP6599081A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Ishidate
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP6599081A priority Critical patent/JPS57181538A/en
Publication of JPS57181538A publication Critical patent/JPS57181538A/en
Pending legal-status Critical Current

Links

Landscapes

  • Variable Magnification In Projection-Type Copying Machines (AREA)

Abstract

PURPOSE: To adjust the back focus of a lens delicately and accurately by forming the screws between the 1st and 2nd sleeves and between the 2nd and 3rd sleeves mutually opposite in directions, and differing their pitches slightly and constituting the 3rd sleeve freely slidably and unrotatably in an axial direction.
CONSTITUTION: This is a device of projecting the image of a film 16 placed on a film stage 20 by means of a light source part 14, and projecting the same through a lens 26 and a mirror 22 to a photoreceptor 24, wherein the 3rd sleeve holding a lens 26 out of the 1st, 2nd, 3rd sleeves 34, 40, 44 of tripple construction cannot be rotated but can be slided axially by means of a pin 46. The screws between the 1st and 2nd sleeves and the screws between the 2nd and 3rd sleeves are mutually opposite in directions and are slightly different in pitches; therefore, if the sleeve 40 is rotated by a motor 54, the sleeve 44, that is, the lens 26, is moved axially at the pitch corresponding to the difference in the pitch between both screws.
COPYRIGHT: (C)1982,JPO&Japio
JP6599081A 1981-04-30 1981-04-30 Back focus adjusting device of copying machine for film Pending JPS57181538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6599081A JPS57181538A (en) 1981-04-30 1981-04-30 Back focus adjusting device of copying machine for film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6599081A JPS57181538A (en) 1981-04-30 1981-04-30 Back focus adjusting device of copying machine for film

Publications (1)

Publication Number Publication Date
JPS57181538A true JPS57181538A (en) 1982-11-09

Family

ID=13302950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6599081A Pending JPS57181538A (en) 1981-04-30 1981-04-30 Back focus adjusting device of copying machine for film

Country Status (1)

Country Link
JP (1) JPS57181538A (en)

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