Photosensor system and image reading method
AssigneeCasio Computer Co., Ltd.
InventorsTomomi Iihama, Hisashi Aoki, Makoto Sasaki, Yasushi Mizutani, Yoshiaki Nakamura
Life of this patent
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Abstract
A photosensor system includes a photosensor array which is constituted by two-dimensionally arraying a plurality of photosensors and has a light-receiving surface, and a front light source which is arranged to face the light-receiving surface at an interval, and illuminates a rear surface of an object whose front surface is set on the light-receiving surface. An image reading assembly reads an object image by receiving light that is emitted by the front light source and passes through the object.
Claims19
A photosensor system comprising:
- a photosensor array which is constituted by two-dimensionally arraying a plurality of photosensors and which has a light receiving surface;
- a first light source which is arranged to face the light receiving surface at an interval, and which illuminates a rear surface of an object whose front surface is set on the light receiving surface;
- an image reading assembly which reads corrugations on the front surface of the object as an object image by receiving light that is emitted by said first light source, which passes through the object, and is scattered according to the corrugations on the front surface of the object;
- and
- a second light source which is arranged on a side of said photosensor array opposite to the light receiving surface, and illuminates via said photosensor array the front surface of the object set on the light receiving surface,
- wherein said image reading assembly receives light that is emitted by said second light source and reflected by the front surface of the object set on the light receiving surface, and reads the object image together with light that is emitted by said first light source and passes through the object.
An image reading method in a photosensor system which reads an object image by a photosensor system having a photosensor array constituted by two-dimensionally arraying a plurality of photosensors, comprising:
- setting a front surface of an object on a light receiving surface of the photosensor array;
- performing first illumination of illuminating the object set on the light receiving surface from a rear surface of the object;
- reading corrugations of the front surface of the object as an object image by receiving light which irradiates the rear surface of the object in the first illumination, passes through the object, and is scattered according to the corrugations on the front surface of the object;
- and
- performing a second illumination of illuminating the object set a the light receiving surface from the front surface of the object via the photosensor array,
- wherein light which irradiates the front surface of the object in the second illumination and is reflected by the front surface of the object is received to reed the object image together with light having passed through the object in the first illumination.
Dependencies are inferred from the claim text.