US4215912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed scanning device for scanning the same area plural times by a beam deflected by a single deflecting surface
Assignee: Canon Inc
•
Filing: 1978-05-04
•
Granted: 1980-08-05
•
Expires: 1998-05-04
Abstract
Abstract A scanning optical system with an improved scanning efficiency wherein a deflection space swept by a beam deflected by a deflecting surface of a deflecting device is divided into plural spatial zones, each of said divided spatial zones is provided with a transmission optical system for guiding the beam passing through each spatial zone to a scanned surface, and the beam scans said surface after passing through said transmission optical system is adapted to scan a same scan area whereby said same scan area is scanned plural times by the beam deflected by a single deflecting surface.
Inventors
- 👤 Kazuo Minoura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/129
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A scanning optical system comprising: a light source; a deflector provided with at least two deflecting surfaces and adapted to deflect the light beam from said light source to a predetermined direction; and a transmission optical system, which permits scanning of the same scan area plural times by a beam deflected by a single deflecting surface of said deflector, including means for spatially dividing the deflected light flux deflected by a first deflecting surface of said deflector into plural partial light fluxes and means for guiding the thus divided partial light fluxes through said transmission optical system to a second deflecting surface of said deflector to perform scanning of said scan area.
Claim 2
Dependent Claim
112 words
A scanning optical system comprising: a light source; a deflector provided with at least two deflecting surfaces and adapted to deflect the light beam from said light source to a predetermined direction; and a transmission optical system, which permits scanning of the same scan area plural times by a beam deflected by a single deflecting surface of said deflector, including means for spatially dividing the deflected light flux deflected by a first deflecting surface of said deflector into plural partial light fluxes and means for guiding the thus divided partial light fluxes through said transmission optical system to a second deflecting surface of said deflector to perform scanning of said scan area.
Claim 3
Dependent Claim
35 words
A scanning optical system according to the claim 1 wherein said deflector is a rotary polygonal mirror, and the number of said transmission optical systems is equal to the number of said partial light fluxes.
Claim 4
Dependent Claim
25 words
A scanning optical system according to the claim 2 wherein said transmission optical system is an afocal optical system consisting of plural mirrors and lenses.
Claim 5
Dependent Claim
32 words
A scanning optical system according to the claim 3 wherein the direction of deflection of the beam entering said second deflecting surface is opposite to the direction of rotation of said deflector.
Claim 6
Dependent Claim
45 words
A scanning optical system according to the claim 1 wherein said deflector is a parallel-surfaced planar mirror with two deflecting surfaces, and two different partial light fluxes among said plural partial light fluxes are guided to said second deflecting surface through said transmission optical system.
Claim 7
Dependent Claim
25 words
A scanning optical system according to the claim 5 wherein said transmission optical system is an afocal optical system consisting of plural mirrors and lenses.
Claim 8
Dependent Claim
32 words
A scanning optical system according to the claim 6 wherein the direction of deflection of the beam entering said second deflecting surface is opposite to the direction of rotation of said deflector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |