EP0457281A2
Expired / Lapsed
EP
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Image reading apparatus
Assignee: Canon Inc
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Filing: 1991-05-14
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Granted: —
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Expires: 2011-05-14
Abstract
Abstract An image reading apparatus comprises a plural-line sensor comprising a plurality of one-dimensional sensor arrays disposed on one and the same substrate, an imaging optical system for imaging an object on the sensor, and a brazed diffraction grating disposed in the optical path between the imaging optical system and the sensor for color-resolving a light beam from the object into a plurality of lights and directing the color-resolved lights to the sensor arrays corresponding thereto, the number of steps of the staircase structure of the diffraction grating being four or more.
Inventors
- 👤 Michitaka c/o Canon K.K. Setani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 11:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/48; H04N1/486; H04N1/488; G; G02; G02B; G02B27/00; G02B27/0025; G02B27/0037; G02B27/10; G02B27/1006; G02B27/1013; G02B27/1086; G02B27/42; G02B27/4205; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02B5/1885; G02B5/20; G02B5/203
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
An image reading apparatus comprising: a plural-line sensor comprising a plurality of one-dimensional sensor arrays disposed on one and the same substrate; an imaging optical system for imaging an object on said sensor; and a brazed diffraction grating disposed in the optical path between said imaging optical system and said sensor for color-resolving a light beam from said object into a plurality of lights and directing said color-resolved lights to said sensor arrays corresponding thereto, the number of steps of the staircase structure of said diffraction grating being four or more.
Claim 2
Dependent Claim
44 words
An image reading apparatus according to Claim 1, wherein said plural-line sensor is a plural-line sensor in which one-dimensional sensor arrays are disposed on a plurality of lines with finite distances therebetween in a direction orthogonal to the array direction of the sensor arrays.
Claim 3
Dependent Claim
34 words
An image reading apparatus according to Claim 1, wherein said brazed diffraction grating color-resolves the light from said object into a plurality of lights in a direction orthogonal to the direction of said arrays.
Claim 4
Dependent Claim
25 words
An image reading apparatus according to Claim 1, wherein a wavelength selective filter characteristic is not added to the sensor surface of said plural-line sensor.
Claim 5
Dependent Claim
29 words
An image reading apparatus according-to Claim 2, wherein said object is scanned in the sub-scanning direction which is a direction orthogonal to the array direction of said sensor arrays.
Claim 6
Dependent Claim
23 words
An image reading apparatus according to Claim 5, wherein the sensor surface of said plural-line sensor is disposed parallel to the sub-scanning direction.
Claim 7
Dependent Claim
19 words
An image reading apparatus according to Claim 1, wherein said brazed diffraction grating is a one-dimensional brazed diffraction grating.
Claim 8
Dependent Claim
30 words
An image reading apparatus according to Claim 1, wherein the grating thickness of the staircase structure of said brazed diffraction grating is not uniform for each step of the grating.
Claim 9
Dependent Claim
30 words
An image reading apparatus according to Claim 1, wherein the grating width of the staircase structure of said brazed diffraction grating is not uniform for each step of the grating.
References Cited (Backward Citations)
No citation records indexed.
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