JPS57124755A - Failure detector - Google Patents
Failure detectorInfo
- Publication number
- JPS57124755A JPS57124755A JP1135781A JP1135781A JPS57124755A JP S57124755 A JPS57124755 A JP S57124755A JP 1135781 A JP1135781 A JP 1135781A JP 1135781 A JP1135781 A JP 1135781A JP S57124755 A JPS57124755 A JP S57124755A
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- kept
- modulated
- mirror
- region
- 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
Links
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Abstract
PURPOSE: To prevent print failure, by instantly detecting if laser beam is kept modulated, through the provision of a laser beam detector outside an effective print region of a laser printer.
CONSTITUTION: Laser beam passing through a beam modulator 1 is reflected with a rotary multi-mirror 2, and the beam scans of a photoreceptor drum 3 from A to B accompanied with the revolution of the mirror 2. If the laser beam is kept modulated due to failures in a beam modulator, the laser beam passes through the point B and scans the region outside of effective print region. This is detected with a beam detector consisting of a reflecting mirror 6 and a receiver 7 provided outside the effective print region. Thus, when the state that the laser beam is kept modulated is produced, this can be detected instantly to prevent print failures.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1135781A JPS57124755A (en) | 1981-01-27 | 1981-01-27 | Failure detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1135781A JPS57124755A (en) | 1981-01-27 | 1981-01-27 | Failure detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57124755A true JPS57124755A (en) | 1982-08-03 |
Family
ID=11775770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1135781A Pending JPS57124755A (en) | 1981-01-27 | 1981-01-27 | Failure detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57124755A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6042736A (en) * | 1983-08-17 | 1985-03-07 | Fuji Xerox Co Ltd | Illumination assay diagnostic method |
JPH02211464A (en) * | 1989-02-13 | 1990-08-22 | Ricoh Co Ltd | Detection of laser beam quantity |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5193219A (en) * | 1975-02-13 | 1976-08-16 | ||
JPS51146841A (en) * | 1975-06-12 | 1976-12-16 | Canon Inc | Laser beam operating condition detecting device |
JPS5483833A (en) * | 1977-12-16 | 1979-07-04 | Hitachi Ltd | Printer |
-
1981
- 1981-01-27 JP JP1135781A patent/JPS57124755A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5193219A (en) * | 1975-02-13 | 1976-08-16 | ||
JPS51146841A (en) * | 1975-06-12 | 1976-12-16 | Canon Inc | Laser beam operating condition detecting device |
JPS5483833A (en) * | 1977-12-16 | 1979-07-04 | Hitachi Ltd | Printer |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6042736A (en) * | 1983-08-17 | 1985-03-07 | Fuji Xerox Co Ltd | Illumination assay diagnostic method |
JPH02211464A (en) * | 1989-02-13 | 1990-08-22 | Ricoh Co Ltd | Detection of laser beam quantity |
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