JPS5698075A - Original reading device - Google Patents

Original reading device

Info

Publication number
JPS5698075A
JPS5698075A JP66780A JP66780A JPS5698075A JP S5698075 A JPS5698075 A JP S5698075A JP 66780 A JP66780 A JP 66780A JP 66780 A JP66780 A JP 66780A JP S5698075 A JPS5698075 A JP S5698075A
Authority
JP
Japan
Prior art keywords
plate
spring
expansion
reading part
distance
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.)
Granted
Application number
JP66780A
Other languages
Japanese (ja)
Other versions
JPS6262100B2 (en
Inventor
Haruo Kadoi
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP66780A priority Critical patent/JPS5698075A/en
Publication of JPS5698075A publication Critical patent/JPS5698075A/en
Publication of JPS6262100B2 publication Critical patent/JPS6262100B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Input (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To limit the change of distance between two photodetectors arranged in parallel to each other within a prescribed range regardless of the change of ambient temperature, by keeping the distance between the optical axes at a certain value by utilizing the difference of the linear expansion rate among different types of metals. CONSTITUTION:The upper plate 101 containing the lens 61 and the photodetector 71 is fixed to the middle plate 14 at an end with the screw 13 with the other end pressed onto the plate 14 with the plate spring 151 which is directly provided near the center of the plate 14. This spring 15 is attached on the plate 101, and a gap is provided between the spring 15 and the plate 101 to absorb the expansion and contraction caused by the heat expansion. At the same time, the spring 15 has a gap to absorb the expansion and contraction due to the heat expansion or vibration. The reading part 82 is provided in an exactly same way as the reading part 81 mentioned above. The upper plates 101 and 102 are made of the material having a larger coefficient of heat expansion than the plate 14, and the size of each reading part is set to satisfy the prescribed conditions. As a result, the distance between the optical axes is kept constant even though the reading part expands or contracts by the ambient temperatures.
JP66780A 1980-01-07 1980-01-07 Original reading device Granted JPS5698075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP66780A JPS5698075A (en) 1980-01-07 1980-01-07 Original reading device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP66780A JPS5698075A (en) 1980-01-07 1980-01-07 Original reading device

Publications (2)

Publication Number Publication Date
JPS5698075A true JPS5698075A (en) 1981-08-07
JPS6262100B2 JPS6262100B2 (en) 1987-12-24

Family

ID=11480085

Family Applications (1)

Application Number Title Priority Date Filing Date
JP66780A Granted JPS5698075A (en) 1980-01-07 1980-01-07 Original reading device

Country Status (1)

Country Link
JP (1) JPS5698075A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01167989U (en) * 1988-05-09 1989-11-27

Also Published As

Publication number Publication date
JPS6262100B2 (en) 1987-12-24

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