US4103156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light scanning device
Assignee: Canon Inc
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Filing: 1976-12-02
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Granted: 1978-07-25
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Expires: 1996-12-02
Abstract
Abstract A scanning device for deflecting a light beam, said device being constructed with a deflector such as, for example, a rotatory polygonal mirror, which causes a light incidence position on the deflecting and reflecting surface thereof to shift in accordance with the deflecting action of the deflector, a detector for detecting when the light incidence position is at a corner part of the deflecting and a reflecting surface, and light interceptor operable in accordance with a detection signal from the abovementioned detector, when the light incidence position reaches the corner part of the deflecting and reflecting surface, to interrupt incidence of the light beam onto the deflecting and reflecting surface.
Inventors
- 👤 Katsumi Masaki
- 👤 Kazuhiro Hirayama
- 👤 Yasushi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/127; G02B27/00; G02B27/0025; G02B27/0031
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A scanning device for reflecting a light beam, comprising: a. a light source for emitting a light beam; b. a deflector having a reflecting surface which receives the light beam from said light source; c. means to detect the incidence position of the light beam on the reflecting surface of said deflector; and d. light intercepting means to interrupt the incidence of the light beam on said reflecting surface in accordance with a detection signal from said detector means indicating that the incidence position of said light beam has shifted to the corner of said reflecting surface.
Claim 2
Dependent Claim
97 words
A scanning device for reflecting a light beam, comprising: a. a light source for emitting a light beam; b. a deflector having a reflecting surface which receives the light beam from said light source; c. means to detect the incidence position of the light beam on the reflecting surface of said deflector; and d. light intercepting means to interrupt the incidence of the light beam on said reflecting surface in accordance with a detection signal from said detector means indicating that the incidence position of said light beam has shifted to the corner of said reflecting surface.
Claim 3
Dependent Claim
16 words
The device as claimed in claim 1, wherein said light source is a laser light source.
Claim 4
Dependent Claim
15 words
The device as claimed in claim 1, wherein said deflector is a rotatory polygonal mirror.
Claim 5
Dependent Claim
93 words
A scanning device for deflecting a light beam, comprising: a. light source for emitting a light beam; b. a deflector for deflecting the light beam along a scanning line, wherein the incidence position of the light beam from the light source shifts during scanning; c. light incidence position detecting means having a light beam detector disposed on the scanning line of the scanning light from said deflector; and d. a light interceptor disposed between said light source and said deflector and responsive to an output signal from said light incidence position detecting means.
Claim 6
Dependent Claim
93 words
A scanning device for deflecting a light beam, comprising: a. light source for emitting a light beam; b. a deflector for deflecting the light beam along a scanning line, wherein the incidence position of the light beam from the light source shifts during scanning; c. light incidence position detecting means having a light beam detector disposed on the scanning line of the scanning light from said deflector; and d. a light interceptor disposed between said light source and said deflector and responsive to an output signal from said light incidence position detecting means.
References Cited (Backward Citations)
US3692414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |