JPS56107264A - Controller for quantity of light - Google Patents
Controller for quantity of lightInfo
- Publication number
- JPS56107264A JPS56107264A JP974180A JP974180A JPS56107264A JP S56107264 A JPS56107264 A JP S56107264A JP 974180 A JP974180 A JP 974180A JP 974180 A JP974180 A JP 974180A JP S56107264 A JPS56107264 A JP S56107264A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- signal
- limit
- emitted light
- circuit
- 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
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
- H04N1/40—Picture signal circuits
- H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
- H04N1/4005—Circuits exciting or modulating particular heads for reproducing continuous tone value scales with regulating circuits, e.g. dependent upon ambient temperature or feedback control
-
- 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
- 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
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
-
- 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
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Semiconductor Lasers (AREA)
Abstract
PURPOSE:To enable control over the quantity of light without using a high-speed photodetector by exercising output control over a semiconductor laser on arrival of a recording signal of greater than a constant width. CONSTITUTION:The current that corresponds to the count value of reverisble counter 17 drives semiconductor laser 1 and when its quantity of emitted light is greater or less than the upper limit or lower limit of a set range, the signal of upper- limit or lower-limit comparing circuit 14 or 16 is applied to counter 17. On arrival of a recording signal of a high level longer than time (t), the count value of counter 17 decreases or increases by the signal of pulse-width detecting circuit 19 and the output of current limiting circuit 21 also varies accordingly, so that the quantity of emitted light of laser 1 will decrease or increase. If the quantity of emitted light does not reach a prescribed value according to fluctuations of the ambient temperature, a carry or borrow signal is sent from counter 17 to safety circuit 22, so that while counter 17 is reset, an external alarm will be given.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP974180A JPS56107264A (en) | 1980-01-30 | 1980-01-30 | Controller for quantity of light |
US06/225,345 US4443695A (en) | 1980-01-25 | 1981-01-15 | Apparatus for controlling the quantity of light |
DE19813102185 DE3102185A1 (en) | 1980-01-25 | 1981-01-23 | CONTROL DEVICE FOR RADIATION QUANTITY CONTROL |
DE3153710A DE3153710C2 (en) | 1980-01-25 | 1981-01-23 | Light output monitor from semiconductor laser |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP974180A JPS56107264A (en) | 1980-01-30 | 1980-01-30 | Controller for quantity of light |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56107264A true JPS56107264A (en) | 1981-08-26 |
JPH0363073B2 JPH0363073B2 (en) | 1991-09-27 |
Family
ID=11728729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP974180A Granted JPS56107264A (en) | 1980-01-25 | 1980-01-30 | Controller for quantity of light |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56107264A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57162481A (en) * | 1981-03-23 | 1982-10-06 | Ibm | Control circuit for light emtting semiconductor device |
JPS58162659U (en) * | 1982-04-23 | 1983-10-29 | 日立工機株式会社 | Laser diode light amount detection device |
JPS61165774A (en) * | 1984-12-27 | 1986-07-26 | Fujitsu Ltd | Output level control system of semiconductor laser |
JPS61259585A (en) * | 1985-05-13 | 1986-11-17 | Hitachi Cable Ltd | Semiconductor laser protecting device |
JPH09266353A (en) * | 1996-03-28 | 1997-10-07 | Nec Corp | Digital light power control circuit |
US5966159A (en) * | 1994-05-24 | 1999-10-12 | Canon Kabushiki Kaisha | Method and apparatus for adjusting an apparatus using light source and recording apparatus adjusted thereby |
JP2009001006A (en) * | 2007-05-24 | 2009-01-08 | Ricoh Co Ltd | Image forming apparatus and image forming method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS543540A (en) * | 1977-06-10 | 1979-01-11 | Canon Inc | Automatic exposure device |
JPS5413343A (en) * | 1977-07-01 | 1979-01-31 | Canon Inc | Recording apparatus |
-
1980
- 1980-01-30 JP JP974180A patent/JPS56107264A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS543540A (en) * | 1977-06-10 | 1979-01-11 | Canon Inc | Automatic exposure device |
JPS5413343A (en) * | 1977-07-01 | 1979-01-31 | Canon Inc | Recording apparatus |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57162481A (en) * | 1981-03-23 | 1982-10-06 | Ibm | Control circuit for light emtting semiconductor device |
JPS6355791B2 (en) * | 1981-03-23 | 1988-11-04 | Intaanashonaru Bijinesu Mashiinzu Corp | |
JPS58162659U (en) * | 1982-04-23 | 1983-10-29 | 日立工機株式会社 | Laser diode light amount detection device |
JPS61165774A (en) * | 1984-12-27 | 1986-07-26 | Fujitsu Ltd | Output level control system of semiconductor laser |
JPH041343B2 (en) * | 1984-12-27 | 1992-01-10 | Fujitsu Ltd | |
JPS61259585A (en) * | 1985-05-13 | 1986-11-17 | Hitachi Cable Ltd | Semiconductor laser protecting device |
JPH0452634B2 (en) * | 1985-05-13 | 1992-08-24 | Hitachi Cable | |
US5966159A (en) * | 1994-05-24 | 1999-10-12 | Canon Kabushiki Kaisha | Method and apparatus for adjusting an apparatus using light source and recording apparatus adjusted thereby |
JPH09266353A (en) * | 1996-03-28 | 1997-10-07 | Nec Corp | Digital light power control circuit |
JP2009001006A (en) * | 2007-05-24 | 2009-01-08 | Ricoh Co Ltd | Image forming apparatus and image forming method |
Also Published As
Publication number | Publication date |
---|---|
JPH0363073B2 (en) | 1991-09-27 |
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