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LED linear light source and reading apparatus

A linear light source and rod-shaped technology, applied in the field of LED linear light source and reading device, can solve the problem that it is difficult to shorten the total length of the light guide, and achieve the effect of a compact linear light source

Inactive Publication Date: 2011-09-14
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to shorten the overall length of the light guide

Method used

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  • LED linear light source and reading apparatus
  • LED linear light source and reading apparatus
  • LED linear light source and reading apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] figure 1 This shows the first embodiment of the LED linear light source of the present invention. The light guide 1 is made of transparent acrylic resin and has a total length of 320 mm. figure 1 (a) shows a side view as viewed from the light incident portion 10 of the light guide 1 orthogonal to the optical axis direction, figure 1 (b) shows a measurement configuration diagram including the light receiving element 32, figure 1 (c) means figure 1 (b) A-A' sectional view.

[0054] The light guide 1 is composed of an upper surface 3 including an emission surface 2, a lower surface 7 disposed opposite to the upper surface 3, and a side surface 8 connecting the upper surface 3 and the lower surface 7. A reflective surface 6 composed of concave portions 4 and convex portions 5 is formed on the lower surface 7.

[0055] The light source 12 is composed of a light emitting diode 13 placed on a substrate; a hemispherical sealing body 14 that seals the outer periphery thereof; an...

Embodiment 2

[0064] figure 2 It is the second embodiment of the LED linear light source of the present invention. The difference from the first embodiment is that a translucent diffuser 37 is sandwiched between the lower surface 34 and the side surface 35 of the light guide 33 and the diffuse reflection member 36. As the semi-transparent diffusion sheet 37, for example, 25MBC manufactured by Koto Co., Ltd. can be used.

[0065] in figure 2 In (a), the small rectangular member mounted on the glass 31 represents the light receiving element 32. The light receiving element 32 can be moved in the Z direction, and the intensity distribution on the glass 31 can be measured.

[0066] figure 2 (b) shows the intensity distribution on the glass 31. The vertical axis in the figure represents the relative intensity of light. Specifically, the measurement glass 31 on the manuscript side is equivalent to and figure 1 (b) The light intensity value at the position of the intersection b1 of the imaginary ...

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Abstract

The invention provides an LED linear light source and a reading apparatu, wherein the output light uniformity including light emitted from a circumference of the end portion is acquired and the full length of the light guiding member is used as the effective light emission length. The LED linear light source includes an approximately rod-shaped light guiding member, at an end portion of which an LED is provided. The light guiding member is in an approximately arc shape in a cross sectional view taken perpendicular to an optical axis. The light guiding member has an upper face including a light emission face for emitting light and a lower face including a reflective face, which are arranged in parallel. A diffusing member diffuses light provided on part of an outer circumferential face adjacent to a light entering end face of the light guiding member. A light absorption member is provided in an outside of the light guiding member near at an end portion thereof.

Description

Technical field [0001] The invention relates to an LED linear light source and a reading device used in a document lighting device. In particular, it relates to an LED linear light source and a reading device in which LEDs are arranged at the end of a light guide. Background technique [0002] As the light source of the original lighting device, a technology using light emitting diodes (LEDs) has been known. This technology is divided into the following two types: an array type in which a plurality of LEDs are arranged across the entire width direction of the document surface; and an LED is arranged at the end of a light guide made of light-transmitting resin, etc. The type of light transmitted to the light guide. Recently, as the output of LEDs has increased, the type using light guides has attracted attention. [0003] As a linear light source using a light guide, for example, JP-A-11-134918 is included. [0004] Figure 7 Represents the linear light source described in the abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00F21V13/00F21Y101/02
CPCH04N1/02835G02B6/001H04N1/0289
Inventor 龟井宏市至极稔横川佳久金端祥宽
Owner USHIO DENKI KK
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