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Surface illumination unit and transparent original reading apparatus

A technology for lighting units and lighting devices, applied in electrical components, image communication, etc., can solve problems such as high price control, complexity, etc.

Inactive Publication Date: 2008-02-13
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these reasons, it becomes expensive to control complex devices

Method used

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  • Surface illumination unit and transparent original reading apparatus
  • Surface illumination unit and transparent original reading apparatus
  • Surface illumination unit and transparent original reading apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1A and 1B are a top view and a side view of the image reading device of this embodiment. As shown in the upper view of FIG. 1A , in the image reading device 1 , in order to read a light-transmitting original such as a developer photo film, a light-transmitting original unit A of 50 is provided so that it can pass through the original platen glass 6 . Page 7 switch. In the light-transmitting document unit A of 50 , a backlight carriage 51 on which a backlight unit 52 and a backlight driving board 60 are mounted is provided via a shaft 40 for a light-transmitting document unit. In addition, the backlight carriage 51 is also connected to the light-transmitting document unit drive unit 41 and the timing belt 42, and can move in parallel while illuminating the light-transmitting document films 30 (30-1 to 30-4) by the backlight unit 52.

[0054] A light-transmitting document unit A circuit board 43 is fixed to the light-transmitting document unit A at 50 , and communicates ...

Embodiment 2

[0067] Embodiment 2 of the present invention will be described using the top view and side view of the image reading device shown in FIGS. 3A and 3B and the schematic view shown in FIG. 4 . In the first embodiment, as the light source of the backlight unit 52, the lamp 53 and the LED 54 for reading a translucent original were used, but in this embodiment, as the light source, a red LED 73, a green LED 74, a blue LED 75, and an infrared LED 76 are provided. The LED backlight unit 72 that guides light in a planar shape with a light guide plate is used, and is moved in the sub-scanning direction by the LED backlight carriage 71 . In addition, in Embodiment 1, the light-transmitting document unit of 50 is arranged on the image reading device 1 as the light-transmitting document unit A, but here, the light-transmitting document unit B of 70 is arranged on the reflective document press plate 4 and Between the platen glass 6 of the image reading device 1 .

[0068] Furthermore, in E...

Embodiment 3

[0071] Embodiment 3 of the present invention shown in FIGS. 5A and 5B will be described. In Examples 1 and 2, four 35mm films of six frames are arranged side by side to be read, and the planar illumination areas of the backlight unit 11 and the LED backlight unit 71 are produced so that the width in the main scanning direction includes The size of 4 sheets of 35mm film, the width in the sub-scanning direction is slightly larger than the long direction of the image area of ​​one frame of 35mm film. In this embodiment, the light-transmitting original unit C is composed of 80, and 80 uses a small LED backlight unit 81 manufactured so that the width in the main scanning direction is slightly larger than the width in the short direction of the image area of ​​one frame of 35 mm film.

[0072] The reading operation is the same as that of Embodiments 1 and 2, but by using the small LED backlight unit 81, the power consumption can be further reduced, and images can be read even with a...

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Abstract

The invention provides an image reading apparatus that can read a plurality of images without troublesome operations by a user, in which a small-size light source with a small electric power consumption is used as an illumination light source used for reading an image of a transparent original. A surface illumination light source having a size large enough to illuminate one image among a plurality of images included in a transparent original is moved sequentially to positions at which the illumination light source can illuminate the respective images. Each image is read while the illumination light source is kept stationary at the position of the image. In addition, at the position of each image, the transparent original is pressed against an original table of the image reading apparatus.

Description

technical field [0001] The present invention relates to an image reading device for reading image information of a light-transmitting original such as a photo film and an illumination device used therein. Background technique [0002] Conventionally, as described in Japanese Patent Laid-Open No. 1-101063, there is an image reading device that irradiates a light-transmitting document with a planar fixed light source and reads its image. This image reading device will be described with reference to FIGS. 10A and 10B. [0003] FIG. 10A is a cross-sectional view of the image reading device, and FIG. 10B is a perspective view. A light-transmitting document light source 127 is disposed on the document platen glass 121 of the image reading device 120 . The light guide plate 128 has rod-shaped fluorescent tubes 129 attached to its ends, and is disposed so as to be horizontal with respect to a document table glass 121 on which a document is placed. The light guide plate 128 is a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/04
Inventor 野上隆二石塚大介府川仁彦
Owner CANON KK