GB2328788B - Apparatus and method for controlling light intensity - Google Patents

Apparatus and method for controlling light intensity

Info

Publication number
GB2328788B
GB2328788B GB9818668A GB9818668A GB2328788B GB 2328788 B GB2328788 B GB 2328788B GB 9818668 A GB9818668 A GB 9818668A GB 9818668 A GB9818668 A GB 9818668A GB 2328788 B GB2328788 B GB 2328788B
Authority
GB
United Kingdom
Prior art keywords
light intensity
controlling light
controlling
intensity
light
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.)
Expired - Fee Related
Application number
GB9818668A
Other versions
GB2328788A (en
GB9818668D0 (en
Inventor
Tadashi Minakuchi
Makoto Nukui
Mitsunori Iima
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB9818668D0 publication Critical patent/GB9818668D0/en
Publication of GB2328788A publication Critical patent/GB2328788A/en
Application granted granted Critical
Publication of GB2328788B publication Critical patent/GB2328788B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device
    • 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
    • G02B26/12—Scanning systems using multifaceted mirrors
    • G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1209—Intensity control of the optical beam
    • G06K15/1214—Intensity control of the optical beam by feedback
    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
    • H04N1/40043—Circuits exciting or modulating particular heads for reproducing continuous tone value scales using more than one type of modulation, e.g. pulse width modulation and amplitude modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Optical Head (AREA)
GB9818668A 1997-08-27 1998-08-27 Apparatus and method for controlling light intensity Expired - Fee Related GB2328788B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23141897A JP3238648B2 (en) 1997-08-27 1997-08-27 Light intensity control device and light intensity control method

Publications (3)

Publication Number Publication Date
GB9818668D0 GB9818668D0 (en) 1998-10-21
GB2328788A GB2328788A (en) 1999-03-03
GB2328788B true GB2328788B (en) 2002-08-14

Family

ID=16923283

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9818668A Expired - Fee Related GB2328788B (en) 1997-08-27 1998-08-27 Apparatus and method for controlling light intensity

Country Status (2)

Country Link
JP (1) JP3238648B2 (en)
GB (1) GB2328788B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103682980A (en) * 2013-12-17 2014-03-26 昂纳信息技术（深圳）有限公司 Output control method for laser signals

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233175A (en) * 1992-08-24 1993-08-03 International Business Machines Corporation Laser power control independent of beamsplitter transmissivity
GB2301701A (en) * 1995-05-30 1996-12-11 Asahi Optical Co Ltd Light intensity control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233175A (en) * 1992-08-24 1993-08-03 International Business Machines Corporation Laser power control independent of beamsplitter transmissivity
GB2301701A (en) * 1995-05-30 1996-12-11 Asahi Optical Co Ltd Light intensity control

Also Published As

Publication number Publication date
GB2328788A (en) 1999-03-03
JPH1172736A (en) 1999-03-16
JP3238648B2 (en) 2001-12-17
GB9818668D0 (en) 1998-10-21

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee