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Light guide and image reading device

A technology of light guides and light sources, which is applied in printing devices, image communication, optics, etc., can solve the problems of large reading device size and poor optical characteristics, and achieve the effect of small optical characteristics

Active Publication Date: 2022-07-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to irradiate the object to be read with light that is stable throughout the entire reading area, there is a problem that the light irradiated from the end of the light guide has poor optical characteristics, and in order to irradiate the object with light stably, Make the light guide longer in the X-axis direction, resulting in larger size of the reading device itself

Method used

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  • Light guide and image reading device

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Experimental program
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Effect test

Embodiment approach 1

[0027] Next, the image reading apparatus 100 according to Embodiment 1 of the present invention will be described with reference to the drawings. In each of the drawings, the same or the same components are denoted by the same reference numerals. In each drawing, X, Y, and Z represent coordinate axes. The X-axis direction is the main scanning direction (long-side direction), the Y-axis direction is the sub-scanning direction (short-side direction), and the Z-axis direction is the reading depth direction. The origin of the X-axis is the center of the length of the image reading apparatus 100 in the main scanning direction. The origin of the Y-axis is the center of the length of the image reading apparatus 100 in the sub-scanning direction. The origin of the Z axis is the conveyance position of the document M to be read by the image reading apparatus 100 .

[0028] figure 1 It is a perspective view of the image reading apparatus 100 which concerns on Embodiment 1 of this inv...

Embodiment approach 2

[0054] use Figure 8 to Figure 11 , the second embodiment of the present invention will be described. In Embodiment 1, the output surfaces 2b are all at the same angle in the X-axis direction, but direct reflected light that deteriorates the optical properties of the end portion occurs only at the end portion on the side of the light source 1 in the X-axis direction. Therefore, in Embodiment 2, the output surface 2b having an angle at which the parallel light from the reflection surface 2c is totally reflected is formed only at the end on the side of the light source 1 in the X-axis direction. Figure 10 , Figure 11 A perspective view and an exploded view of the image reading apparatus according to Embodiment 2 are shown, respectively. Figure 10 , Figure 11 Among them, the light guide 2 has an exit surface 2b having an angle at which the parallel light from the reflection surface 2c is totally reflected at the end on the bracket 7 side, that is, the light source 1 side. ...

Embodiment approach 3

[0059] In the second embodiment, the output surface 2b is provided at the end of the light source 1 side in the X-axis direction, but in the third embodiment, the output surface 2b that totally reflects the parallel light from the reflection surface 2c and the output surface that transmits 2i are connected continuously while the angle changes.

[0060]In the case of Embodiment 2, uniform optical characteristics can be obtained in the X-axis direction, but the amount of light emitted from the output surface 2b that totally reflects the reflected light from the reflective surface 2c and the output that transmits the reflected light from the reflective surface 2c There is sometimes a difference between the amount of light emitted by the face 2i. When the light amount difference reaches a certain level, it can be adjusted by the density of the fine irregularities provided in the light scattering portion 2a. However, when the shape from the output surface 2b to the output surface ...

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Abstract

The present invention provides an illuminating device and an image reading device, wherein the light guide body (2) comprises: an incident surface arranged at an end in the longitudinal direction into which light emitted by a light source enters; The plane-shaped exit surfaces (2b, 2i) of the light to be illuminated; the parabolic-shaped reflecting surface (2c), for the light from the parabolic-shaped focal point (2f) or from a predetermined range including the focal point (2f) and a light scattering part (2a) having a predetermined scattering area, which scatters the light incident from the incident surface and reflects the incident light toward the direction of the reflecting surface. The outgoing surfaces (2b, 2i) include a pair of surfaces (2c) which have a predetermined length along the longitudinal direction from an end of the light guide body facing the light source and are reflected by the light scattered by the light scattering portion (2a). ) The reflected parallel light is totally reflected by the first exit surface (2b).

Description

technical field [0001] The present invention relates to an image reading apparatus, and more particularly, to a light guide body and an image reading apparatus used in facsimile machines, copiers, scanners, and the like. Background technique [0002] Patent Document 1 discloses an image reading device mounted with an illumination device using a light guide body having a parabolic shape. [0003] prior art literature [0004] Patent Literature [0005] Patent Document 1: Japanese Patent Laid-Open No. 2004-266313 SUMMARY OF THE INVENTION [0006] The technical problem to be solved by the invention [0007] The light guide disclosed in Patent Document 1 has a configuration in which a paraboloid is provided at an end of the light guide, and light from a light source is reflected and propagated in the light guide. In order to irradiate the object to be read with light that is stable over the entire reading area, there is a problem in that the light irradiated from the end o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/04F21V8/00G03B27/54H04N1/028
CPCH04N1/04H04N1/028G03B27/54H04N1/02835H04N1/02825G02B6/0001G02B6/0006G02B6/001
Inventor 松泽卓白木徹大滨大辅奥东祐树
Owner MITSUBISHI ELECTRIC CORP
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