JPS57196213A - Hologram scanner - Google Patents

Hologram scanner

Info

Publication number
JPS57196213A
JPS57196213A JP8152681A JP8152681A JPS57196213A JP S57196213 A JPS57196213 A JP S57196213A JP 8152681 A JP8152681 A JP 8152681A JP 8152681 A JP8152681 A JP 8152681A JP S57196213 A JPS57196213 A JP S57196213A
Authority
JP
Japan
Prior art keywords
light
primary diffracted
diffracted light
optical modulator
hologram
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
JP8152681A
Other languages
Japanese (ja)
Inventor
Takahiro Asai
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 JP8152681A priority Critical patent/JPS57196213A/en
Publication of JPS57196213A publication Critical patent/JPS57196213A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/106—Scanning systems having diffraction gratings as scanning elements, e.g. holographic scanners

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Lasers (AREA)

Abstract

PURPOSE:To irradiate always the primary diffracted light having a constant quantity of light onto a photoreceptor, by providing a feedback controlling means which controls the input for driving an optical modulator in accordance with the variance of the quantity of light of the 0-order light transmitted through a hologram to hold the quantity of light of the primary diffracted light from the hologram in a certain level. CONSTITUTION:The light from an He-Ne laser is modulated by an optical modulator 2, and a primary diffracted light L1 is incident to a hologram disc 3, and a primary diffracted light L10 is incident to a photodetector 4. The output is inputted to an amplifier 8 through a differential amplifier 5 and a gate circuit 6 to amplify the picture signal, which is inputted through a terminal 7 and the gate circuit 6, with an amplification factor proportional to the input signal. The output of the amplifier 8 is sent to the differential amplifier 5 to perform the feedback control, and simultaneously, the output is sent to an optical modulator driver 9 to drive the optical modulator 2. Since the primary diffracted light L10 is increased and decreased according as a primary diffracted light L11 of a hologram disc 3 is decreased ad increased, the light L11 is always held in a certain quantity of light by the feedback control.
JP8152681A 1981-05-28 1981-05-28 Hologram scanner Pending JPS57196213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8152681A JPS57196213A (en) 1981-05-28 1981-05-28 Hologram scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8152681A JPS57196213A (en) 1981-05-28 1981-05-28 Hologram scanner

Publications (1)

Publication Number Publication Date
JPS57196213A true JPS57196213A (en) 1982-12-02

Family

ID=13748766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8152681A Pending JPS57196213A (en) 1981-05-28 1981-05-28 Hologram scanner

Country Status (1)

Country Link
JP (1) JPS57196213A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151721A2 (en) * 1984-02-13 1985-08-21 International Business Machines Corporation Holographic scanner control based on monitored diffraction efficiency
JPS63101814A (en) * 1986-10-17 1988-05-06 Fujitsu Ltd Hologram scanner
US5157522A (en) * 1991-04-01 1992-10-20 Eastman Kodak Company Method and apparatus for providing correction of hologon transmission efficiency variations

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5536821A (en) * 1978-09-06 1980-03-14 Fujitsu Ltd Optical information reading system
JPS565520A (en) * 1979-06-27 1981-01-21 Nec Corp Light intensity evening device of hologram scanner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5536821A (en) * 1978-09-06 1980-03-14 Fujitsu Ltd Optical information reading system
JPS565520A (en) * 1979-06-27 1981-01-21 Nec Corp Light intensity evening device of hologram scanner

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151721A2 (en) * 1984-02-13 1985-08-21 International Business Machines Corporation Holographic scanner control based on monitored diffraction efficiency
JPS60170827A (en) * 1984-02-13 1985-09-04 インタ−ナシヨナル　ビジネス　マシ−ンズ　コ−ポレ−シヨン Optical scanner
JPH0411008B2 (en) * 1984-02-13 1992-02-27
JPS63101814A (en) * 1986-10-17 1988-05-06 Fujitsu Ltd Hologram scanner
JPH0746176B2 (en) * 1986-10-17 1995-05-17 富士通株式会社 Hologram scan
US5157522A (en) * 1991-04-01 1992-10-20 Eastman Kodak Company Method and apparatus for providing correction of hologon transmission efficiency variations

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