Image reading apparatus utilizing a four step or more staircase diffraction grating structure
AssigneeCanon Kabushiki Kaisha
InventorMichitaka Setani
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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.
Claims18
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 plural-line sensor;
- and
- a brazed diffraction grating, having a staircase structure with a number of steps, disposed in an optical path between said imaging optical system and said plural-line 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, wherein the number of steps of the staircase structure of said diffraction grating is four or more.
An image reading apparatus comprising:
- a plural-line sensor comprising a plurality of one-dimensional sensor arrays disposed on the same substrate;
- an imaging optical system for imaging an object on said plural-line sensor;
- and
- a brazed diffraction grating, having a staircase structure with a number of steps, disposed in an optical path between said imaging optical system and said plural-line sensor, for color-separating a light from said object into a plurality of lights, wherein the number of steps of the staircase structure of said diffraction grating is four or more.
Dependencies are inferred from the claim text.