Patent US5283681A successfully refreshed from Google Patents.
US5283681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning optical equipment
Assignee: Canon Inc
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Filing: 1990-04-27
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Granted: 1994-02-01
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Expires: 2010-04-27
Abstract
Abstract A scanning optical equipment provided with the means to detect scanning beam spot at more than two points of the scanned surface and the means to enable direct observation of the state of focussing of the beam spot, thus enabling extremely precise control of the state of focussing and forming an extremely high density image which could not be obtained by the conventional methods.
Inventors
- 👤 Osamu Hoshino
- 👤 Isamu Shimoda
- 👤 Kazuo Isaka
- 👤 Masayuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:35
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/113; H04N1/1135; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
76 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via said photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 2
Dependent Claim
76 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via said photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 3
Dependent Claim
39 words
Scanning optical equipment according to claim 1, wherein said control means controls the focus of the light beam by said optical means in response to a change of the time of generation of the signal from said detecting means.
Claim 4
Dependent Claim
79 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means to focus the light beam on said photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via said photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 5
Dependent Claim
79 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means to focus the light beam on said photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via said photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 6
Dependent Claim
39 words
Laser beam printer according to claim 3, wherein said control means controls the focus of the light beam by said optical means in response to a change of the time of generation of the signal from said detecting means.
Claim 7
Dependent Claim
80 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via a non-image region of the photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 8
Dependent Claim
80 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means, coming via a non-image region of the photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 9
Dependent Claim
89 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam; deflecting means to deflect the light beam; a photosensitive member to receive the light beam deflected by said deflecting means; detecting means to detect the light beam deflected by said deflecting means, coming via a non-image region of the photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 10
Dependent Claim
89 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam; deflecting means to deflect the light beam; a photosensitive member to receive the light beam deflected by said deflecting means; detecting means to detect the light beam deflected by said deflecting means, coming via a non-image region of the photosensitive member, and not returning to said deflecting means; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 11
Dependent Claim
100 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means and coming via a first position on said photosensitive member and the light beam deflected by said deflecting means and coming via a second position which is different from the first position on the photosensitive member; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 12
Dependent Claim
100 words
Scanning optical equipment comprising: a source for a light beam; optical means to focus the light beam on a photosensitive member; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means and coming via a first position on said photosensitive member and the light beam deflected by said deflecting means and coming via a second position which is different from the first position on the photosensitive member; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 13
Dependent Claim
98 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means to focus the light beam; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means and coming via a first position on said photosensitive member and the light beam deflected by said deflecting means coming via a second position which is different from the first position on said photosensitive member; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 14
Dependent Claim
98 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means to focus the light beam; deflecting means to deflect the light beam; detecting means to detect the light beam deflected by said deflecting means and coming via a first position on said photosensitive member and the light beam deflected by said deflecting means coming via a second position which is different from the first position on said photosensitive member; and control means to control the focus of the light beam by said optical means according to a signal received from said detecting means.
Claim 15
Dependent Claim
40 words
Scanning optical equipment according to any of claims 1, 3, 5, 6, 7, 8, wherein said optical means includes a movable collimator for collimating the light beam, and wherein said control means controls the focus through movement of the collimator.
Claim 16
Dependent Claim
30 words
Scanning optical equipment according to claim 7 or 8, further comprising means for pivoting said deflecting means, wherein said control means controls the focus through pivot of said pivoting means.
Claim 17
Dependent Claim
74 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a predetermined plane; detecting means for detecting variation of the state of the light beam between a region of use of said predetermined plane and a region outside the region of use of said predetermined plane; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 18
Dependent Claim
74 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a predetermined plane; detecting means for detecting variation of the state of the light beam between a region of use of said predetermined plane and a region outside the region of use of said predetermined plane; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 19
Dependent Claim
21 words
Scanning optical equipment according to claim 11, wherein said detecting means detects variation of the light quantity of the light beam.
Claim 20
Dependent Claim
61 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a photosensitive member; detecting means for detecting a light beam deflected to said photosensitive member and not returning to said means for deflecting; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 21
Dependent Claim
61 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a photosensitive member; detecting means for detecting a light beam deflected to said photosensitive member and not returning to said means for deflecting; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 22
Dependent Claim
64 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means for deflecting and focusing the light beam to said photosensitive member; detecting means for detecting a light beam deflected to said photosensitive member and not returning to said means for deflecting; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 23
Dependent Claim
64 words
Laser beam printer comprising: a source for a light beam; a photosensitive member; optical means for deflecting and focusing the light beam to said photosensitive member; detecting means for detecting a light beam deflected to said photosensitive member and not returning to said means for deflecting; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 24
Dependent Claim
87 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a photosensitive plane; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said first detecting means and a signal from said second detecting means.
Claim 25
Dependent Claim
87 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a photosensitive plane; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said first detecting means and a signal from said second detecting means.
Claim 26
Dependent Claim
106 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, at least a portion of which is positioned on a predetermined plane; optical means for deflecting and focusing the light beam to said photosensitive member and the predetermined plane; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said first detecting means and a signal from said second detecting means.
Claim 27
Dependent Claim
106 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, at least a portion of which is positioned on a predetermined plane; optical means for deflecting and focusing the light beam to said photosensitive member and the predetermined plane; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said first detecting means and a signal from said second detecting means.
Claim 28
Dependent Claim
95 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting the light beam to a predetermined plane; a frame for accommodating said source and said optical means; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling a position of said frame according to a signal from said first detecting means and a signal from said second detecting means.
Claim 29
Dependent Claim
95 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting the light beam to a predetermined plane; a frame for accommodating said source and said optical means; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling a position of said frame according to a signal from said first detecting means and a signal from said second detecting means.
Claim 30
Dependent Claim
114 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, at least a portion of which is positioned on a predetermined plane; optical means for deflecting the light beam to said photosensitive member and the predetermined plane; a frame for accommodating said source and said optical means; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling a position of said frame according to a signal from said first detecting means and a signal from said second detecting means.
Claim 31
Dependent Claim
114 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, at least a portion of which is positioned on a predetermined plane; optical means for deflecting the light beam to said photosensitive member and the predetermined plane; a frame for accommodating said source and said optical means; first detecting means for detecting the light beam at a first position on said predetermined plane; second detecting means for detecting the light beam at a second position different from the first position on said predetermined plane; and control means for controlling a position of said frame according to a signal from said first detecting means and a signal from said second detecting means.
Claim 32
Dependent Claim
57 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a predetermined plane; detecting means for detecting the light beam at at least two positions on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 33
Dependent Claim
57 words
Scanning optical equipment comprising: a source for a light beam; optical means for deflecting and focusing the light beam to a predetermined plane; detecting means for detecting the light beam at at least two positions on said predetermined plane; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 34
Dependent Claim
64 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, optical means for deflecting and focusing the light beam to said photosensitive member; detecting means for detecting a focus state of the light beam on said photosensitive member at at least two points; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 35
Dependent Claim
64 words
Laser beam printer comprising: a source for a light beam; a photosensitive member, optical means for deflecting and focusing the light beam to said photosensitive member; detecting means for detecting a focus state of the light beam on said photosensitive member at at least two points; and control means for controlling focus of the light beam according to a signal from said detecting means.
Claim 36
Independent Claim
63 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting the light beam coming via the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 37
Independent Claim
63 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting the light beam coming via the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 38
Independent Claim
67 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting a light beam coming via a non-image region of the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 39
Independent Claim
67 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting a light beam coming via a non-image region of the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 40
Independent Claim
63 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting the light beam coming via the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 41
Independent Claim
63 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a light beam deflected by deflecting means to a photosensitive member; detecting the light beam coming via the photosensitive member and not returning to the deflecting means; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 42
Independent Claim
65 words
A method for adjusting a light beam in a scanning optical equipment comprising the steps of: guiding and focusing a deflected light beam to a predetermined plane; detecting the light beam at a first position and a second position different from the first position on the predetermined plane; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 43
Independent Claim
65 words
A method for adjusting a light beam in a scanning optical equipment comprising the steps of: guiding and focusing a deflected light beam to a predetermined plane; detecting the light beam at a first position and a second position different from the first position on the predetermined plane; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 44
Independent Claim
73 words
A method for adjusting a light beam in a scanning optical equipment comprising the steps of: guiding a light beam deflected by a deflector to a predetermined plane; detecting the light beam at a first position and a second position different from the first position on the predetermined plane; and controlling a position of a frame having at least the deflector accommodated thereon on the basis of the detection in said detection step.
Claim 45
Independent Claim
73 words
A method for adjusting a light beam in a scanning optical equipment comprising the steps of: guiding a light beam deflected by a deflector to a predetermined plane; detecting the light beam at a first position and a second position different from the first position on the predetermined plane; and controlling a position of a frame having at least the deflector accommodated thereon on the basis of the detection in said detection step.
Claim 46
Independent Claim
61 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a deflected light beam to a photosensitive member; detecting a focus state of the light beam on the photosensitive member at at least two points; and controlling focus of the light beam on the basis of the detection in said detecting step.
Claim 47
Independent Claim
61 words
A method for adjusting a light beam in a laser beam printer comprising the steps of: guiding and focusing a deflected light beam to a photosensitive member; detecting a focus state of the light beam on the photosensitive member at at least two points; and controlling focus of the light beam on the basis of the detection in said detecting step.
References Cited (Backward Citations)
US4321700A
Cited
US4350988A
Cited
US4251825A
Cited
US4314154A
Cited
GB2041580A
Cited
JPS585078A
Cited
JPS609243A
Cited
JPS6115118A
Cited
JPS61275868A
Cited
US4918306A
Cited
US4834520A
Cited
US4990771A
Cited
US5103091A
Cited
US5095319A
Cited
US5083140A
Cited
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