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Light guide body and bicomponent linear light source device

A technology for light source devices and light guides, which is applied in the direction of point light sources, light sources, lighting devices, etc., can solve the problems of larger devices, inability to adapt to miniaturization, and shadow generation, so as to reduce the formation area, strengthen the formation, increase The effect of freedom of design

Active Publication Date: 2010-01-27
USHIO DENKI KK
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] However, since the light guides described in Patent Document 1 and Patent Document 2 irradiate light from one direction to the document reading surface, shadows are produced when there is a level difference caused by creases or adhesion on the paper surface as the object to be irradiated.
In addition, the light source device described in Patent Document 3 is configured to irradiate the document reading surface with light from two directions, so even if there is a step portion caused by creases or adhesion on the paper surface, no shadow will be generated. Two light guides are configured, so the overall size of the device becomes larger, which cannot meet the requirements of miniaturization

Method used

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  • Light guide body and bicomponent linear light source device
  • Light guide body and bicomponent linear light source device
  • Light guide body and bicomponent linear light source device

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no. 1 approach

[0050] figure 1 It is a perspective view of the light guide 1 according to the invention of the present embodiment.

[0051] In this figure, 1 is a light guide, 2 is a light incident surface formed on one end surface of the light guide 1 in the longitudinal direction, 3 is the other end surface of the light guide 1 in the longitudinal direction, 4a, 4b are light Turning surfaces (reflection surfaces), 5a, 5b are light exit surfaces, 6a, 6b are a pair of protrusions provided on the side between the light turning surfaces 4a, 4b and the light exit surfaces 5a, 5b.

[0052] The light guide 1 is made of rod-shaped transparent acrylic resin, and is formed with a radius of 5 to 6 thin rods with a length of 320 mm. Since the light guide 1 bends when only holding both ends of the light guide 1 and the illumination position shifts, a pair of protrusions 6a, 6b. The light guide body 1 is provided with a light incident surface 2 on at least one end face in the longitudinal direction,...

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Abstract

The invention provides a light guide body and a bicomponent linear light source device which can easily irradiate light on the original read surface in two directions and can realize miniaturization of the device. A light guide body (1) is in a shape of a transparent rod, and forms light steering surfaces (4a, 4b) which extend along the length direction and light outgoing surfaces (5a, 5b) opposite to the light steering surfaces (4a, 4b); the light steering surfaces (4a, 4b) are formed by two surfaces which are formed by vertical surfaces which extend along the length direction relative to the light steering surfaces (4a, 4b) being configured in a cross manner, so that the convergent light in two directions is emitted from the light outgoing surfaces (5a, 5b).

Description

technical field [0001] The present invention relates to a light guide and a double-branched linear light source device, and more particularly to a light guide used as a light source for illuminating image reading devices used in facsimile machines, copiers, image scanners, barcode readers, etc. And double-branch linear light source device. Background technique [0002] In recent years, in image reading devices such as personal facsimile machines, as the power of light emitting diodes (hereinafter referred to as LEDs) has increased and the sensitivity of CCD-type sensors as light-receiving elements has increased, LEDs that are small and low in power consumption have gradually been used. Used as a light source for the reading light source unit. A conventional linear light source device having such LEDs as a light source is known to use a light guide to guide the light emitted from the light source into the light guide in a desired direction for the purpose of reducing the num...

Claims

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Application Information

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IPC IPC(8): F21V8/00F21V13/00H04N1/04G02B27/54H01L33/00F21W131/403F21Y101/02F21Y115/10
Inventor 芜木清幸羽田博成龟井宏市
Owner USHIO DENKI KK
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