Patent US4040737A successfully refreshed from Google Patents.
US4040737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for eliminating ghost image
Assignee: Canon Inc
•
Filing: 1975-09-25
•
Granted: 1977-08-09
•
Expires: 1995-09-25
Abstract
Abstract A method of eliminating a ghost image in an image forming process wherein a recording medium is scanned with a light beam reflected by a polygonal rotary mirror, and wherein the light beam for scanning is directed toward the rotary mirror along a path so that the angle between the path and the rotary axis of the rotary mirror is not equal to 90° so as to displace the ghost image formed on the recording medium to a position out of the scanning line on the recording medium.
Inventors
- 👤 Katsumi Masaki
- 👤 Kazuhiro Hirayama
- 👤 Yasushi Sato
- 👤 Yoichi Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:42
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0018; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; H; H04; H04N; H04N1/00; H04N1/04; H04N1/113; H04N1/1135
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
A method of eliminating a ghost image in an image forming process wherein a recording medium is scanned with a light beam reflected by a polygonal rotary mirror, which comprises directing said light beam to said rotary mirror along a direction so that the angle θ between said direction and the rotary axis of said rotary mirror is not equal to 90° thereby displacing the ghost image formed on said recording medium to a position out of the scanning line on said recording medium.
Claim 2
Independent Claim
84 words
A method of eliminating a ghost image in an image forming process wherein a recording medium is scanned with a light beam reflected by a polygonal rotary mirror, which comprises directing said light beam to said rotary mirror along a direction so that the angle θ between said direction and the rotary axis of said rotary mirror is not equal to 90° thereby displacing the ghost image formed on said recording medium to a position out of the scanning line on said recording medium.
Claim 3
Dependent Claim
26 words
A method of eliminating a ghost image according to claim 1 which comprises positioning said rotary axis perpendicular to the scanning line on said recording medium.
Claim 4
Dependent Claim
34 words
A method of eliminating a ghost image according to claim 1 which comprises positioning said rotary axis at an angle not equal to 90° with respect to the scanning line on said recording medium.
Claim 5
Dependent Claim
36 words
A method of eliminating a ghost image according to claim 1 which comprises providing a masking element in the proximity of said recording medium thereby interrupting the irradiation of said ghost image onto said recording medium.
Claim 6
Dependent Claim
28 words
A method of eliminating a ghost image according to claim 4 in which said masking element is an element elongated in a direction parallel to said scanning line.
Claim 7
Dependent Claim
28 words
A method of eliminating a ghost image according to claim 4 in which said masking element is an element provided in the irradiating position of said ghost image.
Claim 8
Dependent Claim
30 words
A method of eliminating a ghost image according to claim 4 in which said masking element is adjustable longitudinally and transversally with respect to the direction of said scanning line.
Claim 9
Independent Claim
77 words
An apparatus for eliminating a ghost image in an image forming apparatus comprising: a rotary mirror for deflecting a light beam; a recording medium movable in association with said deflected light beam such that the light beam scans the recording medium; and means for directing said light beam at said rotary mirror in such a way that the angle θ between said light beam and the rotary axis of said rotary mirror is not equal to 90°.
Claim 10
Independent Claim
77 words
An apparatus for eliminating a ghost image in an image forming apparatus comprising: a rotary mirror for deflecting a light beam; a recording medium movable in association with said deflected light beam such that the light beam scans the recording medium; and means for directing said light beam at said rotary mirror in such a way that the angle θ between said light beam and the rotary axis of said rotary mirror is not equal to 90°.
Claim 11
Dependent Claim
32 words
An apparatus for eliminating a ghost image according to claim 8 further comprising a masking element positioned to receive the ghost image located out of the scanning line on said recording medium.
Claim 12
Independent Claim
73 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: a rotary mirror for deflecting a light beam; light beam receiving means located at a position to be scanned by said deflected light beam; and means for directing said light beam at said rotary mirror in such a way that the angle θ between said light beam and the rotary axis of said rotary mirror is not equal to 90°.
Claim 13
Independent Claim
73 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: a rotary mirror for deflecting a light beam; light beam receiving means located at a position to be scanned by said deflected light beam; and means for directing said light beam at said rotary mirror in such a way that the angle θ between said light beam and the rotary axis of said rotary mirror is not equal to 90°.
Claim 14
Dependent Claim
24 words
An apparatus for eliminating a ghost image according to claim 10 in which said light beam directing means comprises a light beam reflecting element.
Claim 15
Dependent Claim
40 words
An apparatus for eliminating a ghost image according to claim 10 further comprising a masking element provided in the proximity of said light beam receiving means for interrupting the irradiation of said ghost image onto said light beam receiving means.
Claim 16
Dependent Claim
33 words
An apparatus for eliminating a ghost image according to claim 12, in which said masking element is an element elongated in a direction parallel to the scanning line of said deflected light beam.
Claim 17
Dependent Claim
28 words
An apparatus for eliminating a ghost image according to claim 12 in which said masking element is an element provided in the irradiating position of said ghost image.
Claim 18
Dependent Claim
32 words
An apparatus for eliminating a ghost image according to claim 12 in which said masking element is an element which is adjustable with respect to the direction of said deflected light beam.
Claim 19
Independent Claim
85 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: a light beam deflecting means having at least two reflecting surfaces and rotatably or reciprocatingly movable around an axis; a light beam receiving means having a surface to be scanned by said deflected light beam; and means for directing said light beam at said light beam deflecting means in such a way that the angle θ between said light beam and the axis of said deflecting means is not equal to 90°.
Claim 20
Independent Claim
85 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: a light beam deflecting means having at least two reflecting surfaces and rotatably or reciprocatingly movable around an axis; a light beam receiving means having a surface to be scanned by said deflected light beam; and means for directing said light beam at said light beam deflecting means in such a way that the angle θ between said light beam and the axis of said deflecting means is not equal to 90°.
Claim 21
Independent Claim
80 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: means for reflecting a light beam, having at least two non-parallel reflecting surfaces and movable about a fixed shaft; light beam receiving means having a surface to be scanned by the light beam reflected by said reflecting means; and means for displacing any light reflected by said light receiving means and re-reflected by said reflecting means away from the scanning line formed by said reflected light beam.
Claim 22
Independent Claim
80 words
An apparatus for eliminating a ghost image in an image handling apparatus comprising: means for reflecting a light beam, having at least two non-parallel reflecting surfaces and movable about a fixed shaft; light beam receiving means having a surface to be scanned by the light beam reflected by said reflecting means; and means for displacing any light reflected by said light receiving means and re-reflected by said reflecting means away from the scanning line formed by said reflected light beam.
References Cited (Backward Citations)
US2234717A
Cited
US2331113A
Cited
US2823579A
Cited
US3867571A
Cited
US3898627A
Cited
US3974506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |