Patent US5223703A successfully refreshed from Google Patents.
US5223703A
Expired / Lapsed
US
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Image reader with color decomposing blazed diffraction grating
Assignee: Canon Inc
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Filing: 1991-01-25
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Granted: 1993-06-29
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Expires: 2011-01-25
Abstract
Abstract An image reader comprises a monolithic 3-line sensor having three one-dimension sensor arrays such as solid-state imaging devices arranged on one substrate with each array being spaced by a predetermined distance along a direction perpendicular to the array direction, a focusing optical system for focusing an image of an object onto the sensor, and a one-dimension blazed diffraction grating arranged in a light path between the focusing optical system and the sensor, closer to the sensor than to an exit pupil of the focusing optical system for spectroscopically separating a light from one point on the object by a diffraction effect to color-decompose it into three colors perpendicularly to the array and directing the color-decomposed lights to the corresponding sensor arrays. Distances from a center sensor array of the 3-line sensor to two other sensor lines are different from each other.
Inventors
- 👤 Michitaka Setani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:51
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/48; H04N1/486; H04N1/488
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
An image reader comprising: a multi-line sensor having a plurality of one-dimension sensor arrays arranged on one substrate with different spacings between each adjacent pair of said one-dimension sensor arrays; a focusing optical system for focusing an object onto said sensor; and a blazed diffraction grating arranged in a light path between said focusing optical system and said sensor for color-decomposing the light from the object into a plurality of color component lights and directing the decomposed lights to corresponding sensor arrays.
Claim 2
Dependent Claim
82 words
An image reader comprising: a multi-line sensor having a plurality of one-dimension sensor arrays arranged on one substrate with different spacings between each adjacent pair of said one-dimension sensor arrays; a focusing optical system for focusing an object onto said sensor; and a blazed diffraction grating arranged in a light path between said focusing optical system and said sensor for color-decomposing the light from the object into a plurality of color component lights and directing the decomposed lights to corresponding sensor arrays.
Claim 3
Dependent Claim
27 words
An image reader according to claim 1 wherein said multi-line sensor comprises a monolithic 3-line sensor having three parallel one-dimension sensor arrays with a predetermined spacing therebetween.
Claim 4
Dependent Claim
28 words
An image reader according to claim 2 wherein the spacings from a center sensor array of the 3-line sensor to the two other sensor arrays are not equal.
Claim 5
Dependent Claim
28 words
An image reader according to claim 1 wherein said blazed diffraction grating is arranged closer to said sensor than to an exit pupil of said focusing optical system.
Claim 6
Dependent Claim
18 words
An image reader according to claim 1 wherein said blazed diffraction grating is a one-dimension blazed diffraction grating.
Claim 7
Dependent Claim
19 words
An image reader according to claim 1 wherein said blazed diffraction grating is a reflection type blazed diffraction grating.
Claim 8
Dependent Claim
74 words
An image reader comprising: a multi-line sensor having a plurality of one-dimension sensor arrays arranged on one substrate with different spacings between each adjacent pair of said one-dimension sensor arrays; a focusing optical system for focusing an object onto said sensor; and a blazed diffraction grating arranged in a light path between said focusing optical system and said sensor and adapted to separate the light from the object into a plurality of color components.
Claim 9
Dependent Claim
74 words
An image reader comprising: a multi-line sensor having a plurality of one-dimension sensor arrays arranged on one substrate with different spacings between each adjacent pair of said one-dimension sensor arrays; a focusing optical system for focusing an object onto said sensor; and a blazed diffraction grating arranged in a light path between said focusing optical system and said sensor and adapted to separate the light from the object into a plurality of color components.
Claim 10
Dependent Claim
26 words
An image reader according to claim 7 wherein said multi-line sensor comprises a monolithic 3-line sensor having three parallel one-dimension sensor arrays with predetermined spacings therebetween.
Claim 11
Dependent Claim
28 words
An image reader according to claim 8 wherein the spacings from a center sensor array of the 3-line sensor to the two other sensor arrays are not equal.
Claim 12
Dependent Claim
28 words
An image reader according to claim 7 wherein said blazed diffraction grating is arranged closer to said sensor than to an exit pupil of said focusing optical system.
Claim 13
Dependent Claim
18 words
An image reader according to claim 7 wherein said blazed diffraction grating is a one-dimension blazed diffraction grating.
Claim 14
Dependent Claim
19 words
An image reader according to claim 7 wherein said blazed diffraction grating is a reflection type blazed diffraction grating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |