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Illumination unit, image reading apparatus and forming apparatus using the illumination unit

A technology of image reading equipment and lighting unit, which is applied in lighting and heating equipment, equipment using electrical recording technology of charge graphics, image communication, etc., can solve the problems of focus deviation, non-imaging, equipment temperature rise, etc., and achieve low Higher power consumption, lower power consumption, and higher utilization efficiency

Inactive Publication Date: 2012-01-25
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tube lamps such as xenon lamps and halogen lamps used in the past usually consume a lot of power and generate a lot of heat, which causes the temperature of the entire equipment to rise
The temperature rise in the image reading device causes the following problems: the conjugate relationship of the optical system collapses, the focal point deviates from the photoelectric conversion element so that no image is formed, and a good image cannot be obtained
[0009] In the case of a tube lamp such as a xenon lamp, this phenomenon is difficult to occur due to the diffuse light source, however, it is easy to occur in the case of a highly directional LED, etc.
Moreover, when the depth of focus of the equal-magnification imaging element itself is shallow like a close-fit equal-magnification sensor, even if a highly directional LED or the like is used, it is difficult for this phenomenon to occur. However, in the depth of focus It is a phenomenon that can be detected in the optical system of the deep reduction system, and it is a phenomenon that can be significantly detected in the case of a glossy original, etc.

Method used

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  • Illumination unit, image reading apparatus and forming apparatus using the illumination unit
  • Illumination unit, image reading apparatus and forming apparatus using the illumination unit
  • Illumination unit, image reading apparatus and forming apparatus using the illumination unit

Examples

Experimental program
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Effect test

no. 1 example

[0087] As described above, since white spots occur in conventional lighting units, the lighting unit of the present invention is characterized in that a plurality of light sources that irradiate light from a small area to the illuminated part are arranged, and the plurality of light sources are LEDs. In an imaginary plane including the light source and the portion to be illuminated, the plurality of light sources are arranged outside a vertical area in a direction perpendicular to the portion to be illuminated.

[0088] here, Figure 5 It is a schematic diagram which shows the structure of the 1st Example of the lighting unit of this invention.

[0089] The lighting unit of this embodiment is formed in such a structure that a plurality of LEDs 3A as light sources are arranged, and light irradiated from the LEDs 3A is reflected by a mirror 7 to irradiate an irradiated portion.

[0090] In addition, the lighting unit in the first embodiment, the second embodiment and the third ...

no. 2 example

[0104] Figure 12 is a schematic diagram showing the structure of the second embodiment of the lighting unit of the present invention, Figure 13 is a schematic diagram showing the structure of a modification of the second embodiment of the lighting unit of the present invention.

[0105] In the present embodiment, the arrangement of the LED 3A and the mirror 7 in the first embodiment is changed to irradiate light to the part to be illuminated, and since the mirror 7 can collect light to the part to be illuminated, efficient lighting can be performed.

[0106] However, since if Figure 11 With mirror 7 configured as shown, white spots occur, therefore, if Figure 12 and Figure 13 As shown, it is necessary to make the virtual image of the light source caused by reflection outside the vertical line area.

[0107] Furthermore, a photoconductor may be provided instead of the mirror 7 . Here, the light guide is an optical element that guides light entering from one end to the...

no. 3 example

[0109] The structure of the third embodiment is the same as that of the first embodiment except for the LED.

[0110] This embodiment can read color information required to obtain full-color image information by using white LEDs. Furthermore, when color information is read, color bleeding occurs, and deterioration due to white spots is conspicuous, but by using the lighting unit of the present invention, white spots can be reduced in the case of light of any wavelength.

[0111]Furthermore, by adopting light sources of multiple colors instead of white LEDs, and by adopting light sources of colors corresponding to the respective filters of red (R), green (G), and blue (B) of the photoelectric conversion element, light utilization efficiency is improved. , and can read full-color image information. Usually, since the LED 3A has a narrow wavelength band, it is not limited to three colors as a light source unit, and the reproducibility of the color information of document informa...

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PUM

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Abstract

An illumination unit can well inhibit the light collection of the light source and the image can be well read by using the illumination unit even during reading the float section of the manuscript. The illumination unit is provided with a plurality of light sources that emit illumination light from minute area towards the illuminated part. In the plane containing the light source and the illuminated part, the light source is disposed outside the perpendicular area in the perpendicular direction with respect to the illuminated part.

Description

technical field [0001] The present invention relates to an illumination unit that irradiates light to an original, and an image reading apparatus and an image forming apparatus that use the illumination unit, and more particularly, relates to a method of using an imaging element in a photoelectric conversion element such as a CCD, etc. A digital image reading apparatus, a digital copying machine, etc., which image an image to read original information, and a lighting unit used therein. Background technique [0002] Conventionally used tube lamps such as xenon lamps and halogen lamps usually consume a large amount of power and generate a lot of heat, which causes the temperature of the entire device to rise. The rise in temperature in the image reading device causes problems in that the conjugate relationship of the optical system collapses, the focal point deviates from the photoelectric conversion element so that no image is formed, and a good image cannot be obtained. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/028G03G15/00F21S8/00F21Y101/02
Inventor 须藤芳文樱井靖夫仁科喜一朗伊藤昌弘辰野响
Owner RICOH KK