US4935615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light intensity control for light beam recorder
Assignee: Canon Inc
•
Filing: 1988-08-15
•
Granted: 1990-06-19
•
Expires: 2008-08-15
Abstract
Abstract A beam recorder comprises a beam generator, a deflector for deflecting the beam to scan the beam, and a light intensity control unit for controlling a light intensity of the beam. The deflection has a plurality of deflection planes to which the beam is directed, and at least one of the deflection planes in a non-scan plane. The light intensity control is effected by utilizing a period in which the beam is directed to the non-scan plane.
Inventors
- 👤 Yoshida Eiichi
- 👤 Kenjiro Hori
- 👤 Takashi Nakahara
- 👤 Satoshi Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:43
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1209; G06K15/1214; H04N1/04; H04N1/047; H04N1/053; H04N1/113; H04N1/1135; H04N1/40037; H04N1/12; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04732; H04N2201/04744
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A beam recorder comprising: beam generation means for generating a recording beam; deflection means for deflecting the beam to scan the beam generated by said beam generation means, said deflection means having at least one deflection portion to which the beam is directed for recording, and having at least one non-recording portion; and light intensity control means for controlling a light intensity of the beam; wherein said light intensity control means controls the light intensity of the beam only when the beam is directed to the non-recording portion.
Claim 2
Dependent Claim
88 words
A beam recorder comprising: beam generation means for generating a recording beam; deflection means for deflecting the beam to scan the beam generated by said beam generation means, said deflection means having at least one deflection portion to which the beam is directed for recording, and having at least one non-recording portion; and light intensity control means for controlling a light intensity of the beam; wherein said light intensity control means controls the light intensity of the beam only when the beam is directed to the non-recording portion.
Claim 3
Dependent Claim
34 words
A beam recorder according to claim 1, wherein said light intensity control means controls the light intensity of the beam by utilizing a period in whic the beam is directed to the non-recording portion.
Claim 4
Dependent Claim
33 words
A beam recorder according to claim 1, wherein said deflection means includes a rotating polygon mirror having a plurality of reflection portions and a non-reflection plane for the beam as the non-recording portion.
Claim 5
Dependent Claim
68 words
A beam recorder according to claim 2, further comprising: a record medium scanned by the beam deflected by said deflection means; and detection means for detecting a scan position of the beam and generating a detection signal for defining a start position of record on the record medium; said light intensity control means determining a timing to effect the light intensity control in accordance with the detection signal.
Claim 6
Dependent Claim
91 words
A beam recorder comprising: beam generation means for generating a recording beam; a rotating polygon mirror for forming and scanning an image by the beam generated by said generation means, said rotating polygon mirror having a plurality of portions; at least one of the portions of said rotating polygon mirror being a non-scan portion which does not function to form and scan the image; and light intensity control means for controlling a light intensity of the beam by utilizing a period in which the beam is directed to the non-scan portion.
Claim 7
Dependent Claim
91 words
A beam recorder comprising: beam generation means for generating a recording beam; a rotating polygon mirror for forming and scanning an image by the beam generated by said generation means, said rotating polygon mirror having a plurality of portions; at least one of the portions of said rotating polygon mirror being a non-scan portion which does not function to form and scan the image; and light intensity control means for controlling a light intensity of the beam by utilizing a period in which the beam is directed to the non-scan portion.
Claim 8
Dependent Claim
63 words
A beam recorder according to claim 5, wherein said light intensity control means includes detection means for detecting a period in which the beam is directed to the non-scan portion of the rotating polygon mirror, and said detection means detects said period in accordance with a main scan synchronization signal produced when the beam is directed to a image forming and scanning portion.
Claim 9
Dependent Claim
48 words
A beam recorder according to claim 5, wherein said light intensity control means controls the light intensity of the beam during the period in which the beam is directed to a scanning portion of the rotating polygon mirror until the rotating polygon mirror reaches a predetermined rotation speed.
Claim 10
Dependent Claim
60 words
A beam recorder according to claim 7, further comprising: a photo-conductor scanned by the beam reflected by said rotating polygon mirror; means for visualizing the image formed on the photo-sensitive member by toner; and means for controlling the process such that the toner is not deposited to the photo-sensitive member until the rotating polygon mirror reaches the predetermined rotation speed.
Claim 11
Dependent Claim
61 words
A beam recorder according to claim 5, wherein said light intensity control means includes storage means for storing a light intensity control value, and the light intensity control for the beam is effected based on the light intensity control value stored in the storage means in the light intensity control after the rotating polygon mirror has reached the predetermined rotation speed.
References Cited (Backward Citations)
US2476503A
Cited
US3287559A
Cited
FR2050531A5
Cited
US3804485A
Cited
US3944323A
Cited
US4070681A
Cited
GB2191303A
Cited
US4443695A
Cited
US4695714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |