Image reading apparatus
First Claim
Patent Images
1. An apparatus for reading an image on a target object, comprising:
- (a) a housing having a window surrounded by an opening edge;
(b) a light source arranged in said housing;
(c) a total reflection mirror arranged in said housing; and
(d) a diffusion reflection mirror arranged between said light source and a part of an inner wall of said housing, wherein an angle between a normal to a virtual plane including three points on said opening edge and a normal to said total reflection mirror is not less than 70° and
not more than 80°
, and wherein an angle between the normal to the virtual plane and a normal to said diffusion reflection mirror is not less than 40° and
not more than 50°
, and wherein the distance between said light source and said diffusion reflection mirror is less than the distance between said light source and said total reflection mirror.
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Accused Products
Abstract
An apparatus comprises a housing having a window surrounded by an opening edge; a light source arranged in the housing; a total reflection mirror arranged in the housing; and a diffusion reflection mirror for reflecting part of light emitted from the light source toward the window and at the same time reflecting another part of the light emitted from the light source toward the total reflection mirror, wherein light reflected by the total reflection mirror is guided to the window, thereby a target object can be uniformly and brightly irradiated, and good image information can be obtained.
51 Citations
14 Claims
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1. An apparatus for reading an image on a target object, comprising:
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(a) a housing having a window surrounded by an opening edge; (b) a light source arranged in said housing; (c) a total reflection mirror arranged in said housing; and (d) a diffusion reflection mirror arranged between said light source and a part of an inner wall of said housing, wherein an angle between a normal to a virtual plane including three points on said opening edge and a normal to said total reflection mirror is not less than 70° and
not more than 80°
, and wherein an angle between the normal to the virtual plane and a normal to said diffusion reflection mirror is not less than 40° and
not more than 50°
, and wherein the distance between said light source and said diffusion reflection mirror is less than the distance between said light source and said total reflection mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for reading an image on a target object, comprising:
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(a) a housing having a window surrounded by an opening edge; (b) a light source arranged in said housing; (c) a total reflection mirror arranged in said housing and having a total reflection surface for totally reflecting light incident thereon; (d) a diffusion reflection mirror arranged in said housing and having a diffusion reflection surface for diffusing and reflecting light incident thereon; (e) an image sensor, arranged in said housing, for picking up the image of the target object; and (f) a reflection mirror, arranged in said housing, for reflecting the image of the target object which has passed through said window toward said image sensor, wherein an angle formed between a normal to a virtual plane including three points on said opening edge and a normal to said total reflection mirror is not less than 70° and
not more than 80°
, and an angle formed between the normal of the virtual plane and a normal to said diffusion reflection mirror is not less than 40° and
not more than 50°
, and said diffusion reflection mirror is arranged between said light source and the virtual plane.
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13. An apparatus for reading an image on a target object, comprising:
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(a) a housing having a window surrounded by an opening edge; (b) a light source arranged in said housing; (c) a total reflection mirror arranged in said housing and having a total reflection surface for totally reflecting light incident thereon; (d) a diffusion reflection mirror arranged in said housing on an optical axis of said light source and having a diffusion reflection surface for diffusing and reflecting light incident thereon; (e) an image sensor, arranged in said housing, for picking up the image of the target object; and (f) a reflection mirror, arranged in said housing, for reflecting the image of the target object which has passes through said window toward said image sensor, and (g) an image forming lens arranged between said image sensor and said reflection mirror, wherein the optical axis of said image forming lens crosses said image sensor and said reflection mirror, an angle formed between a normal to said reflection mirror and said diffusion reflection surface is not less than 85° and
not more than 95°
, andan angle formed between said total reflection surface and said diffusion reflection surface is not less than 25° and
not more than 35°
.
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14. An apparatus for reading an image on a target object, comprising:
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(a) a housing having a window surrounded by an opening edge; (b) a light source arranged in said housing; (c) a total reflection mirror arranged in said housing; and (d) a diffusion reflection mirror for reflecting a part of the light emitted from said light source toward said window and at the same time reflecting another part of the light emitted from said light source toward said total reflection mirror, wherein light reflected by said total reflection mirror is guided to said windows, and wherein the distance between said light source and said diffusion reflection mirror is less than the distance between said light source and said total reflection mirror.
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Specification