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Illumination device and image reading device

A technology of image reading device and lighting device, which is applied in the direction of printing device, image communication, light guide, etc., and can solve the problems of lack of access, poor lighting efficiency, deep lighting depth, etc.

Pending Publication Date: 2022-03-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In the technology of Patent Document 2, the concave reflection part is an elliptic curve, so the light emitted from the light beam exit surface diverges, and there is a problem that a deep illumination depth cannot be obtained and the illumination efficiency deteriorates.

Method used

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  • Illumination device and image reading device
  • Illumination device and image reading device
  • Illumination device and image reading device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0039] The image reading device 100 according to Embodiment 1 of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same or similar structural element. In each figure, X, Y, and Z represent coordinate axes. Let the X-axis direction be the main scanning direction (long side direction), the Y-axis direction be the sub-scanning direction (short side direction), and the Z-axis direction be the reading depth direction. The origin of the X-axis is set at the center of the length of the image reading device 100 in the main scanning direction. The origin of the Y-axis is set at the center of the length of the image reading device 100 in the sub-scanning direction. The origin of the Z axis is set as the conveyance position of the document M read by the image reading device 100 .

[0040] figure 1 It is a perspective view of the image reading device 100 according to Embodiment ...

Embodiment approach 2

[0065] The image reading device 100 according to Embodiment 2 of the present invention will be described. Image 6 It is a cross-sectional view of the image reading device 100 according to Embodiment 2 of the present invention. Image 6 This is a view of the image reading device 100 viewed from the YZ plane. Figure 7 It is an exploded view of the image reading device 100 according to Embodiment 2 of the present invention. right Image 6 , Figure 7 neutralize Figure 1 to Figure 5 The same or equivalent structural elements are denoted by the same reference numerals, and their descriptions are omitted.

[0066] In the image reading device 100 according to Embodiment 2, a through-hole 5 f extending in the X-axis direction is provided on the planar portion 5 b of the frame 5 (casing 5 ) shown in Embodiment 1. As shown in FIG. The through-hole 5f penetrates at least the position corresponding to the light-scattering part 2a of the transparent body 2 of the planar part 5b. O...

Embodiment approach 3

[0071] The image reading device 100 according to Embodiment 3 of the present invention will be described. Figure 8 ( Figure 8A , Figure 8B ) is a diagram illustrating an illumination path of the image reading device according to Embodiment 3 of the present invention. Figure 8 ( Figure 8A , Figure 8B ) is also a cross-sectional view of the transparent body 2 on the YZ plane. In Figure 8 ( Figure 8A , Figure 8B ), a plurality of arrows represent light rays, each showing the direction of light. For Figure 8 ( Figure 8A , Figure 8B ) with Figure 1 to Figure 5 The same or equivalent structural elements are denoted by the same reference numerals, and their descriptions are omitted.

[0072] In Embodiment 1, the case where the position of the light-scattering part 2a of the transparent body 2 is the same as the position of the focus of the reflection surface 2c was demonstrated. A configuration in which the same operational effect as that of the first embodiment c...

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Abstract

This lighting device is provided with: a light source (1); and a rod-shaped light guide body (2) which extends in the longitudinal direction and guides the incident light toward the object to be illuminated (M), the light source (1) being disposed at the end of the light guide body (2) in the longitudinal direction, the light guide body (2) comprising: an incident surface (2d) provided at the end of the light guide body (2) in the longitudinal direction to which the light generated by the light source (1) is incident; a planar emission surface (2b) that emits the light incident on the light guide body (1) toward an object to be illuminated (M); a reflecting surface (2c) having a paraboloid shape and reflecting light from a focal point of the paraboloid shape or light passing through the focal point and coming from a predetermined range to the emission surface (2b); and a light scattering section (2a) having a predetermined scattering region that scatters the light incident from the incident surface (2d) and reflects the light in the direction of the reflecting surface (2c). The light scattering section (2a) is provided at a parabolic focus (2f) or at a position where the light reflected by the scattering region of the light scattering section passes through the parabolic focus (2f).

Description

[0001] The application for this invention is an invention patent application with the international application number PCT / JP2018 / 006129, the international application date is February 21, 2018, the application number entering the Chinese national phase is 201880012476.3, and the name is "illumination device and image reading device" divisional application. technical field [0002] The present invention relates to an image reading device, and more particularly, to an illumination device and an image reading device used in facsimile machines, copiers, scanners, and the like. Background technique [0003] In an image reading device, in order to clearly read an object to be read that has unevenness on its surface, it is required to irradiate the object to be read with light having a deep illumination depth. [0004] Patent Document 1 discloses an image reading device that directs the optical axis of an array light source toward the document side, makes the light emitted from th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/04G02B6/00G03B27/54H04N1/028
CPCH04N1/04G02B6/0078G03B27/54H04N1/028G02B2006/0098
Inventor 松泽卓白木徹国盐英记大滨大辅
Owner MITSUBISHI ELECTRIC CORP