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Document illuminating device, image access device and image forming device

A lighting device and a technology for reading originals, which are applied in the fields of original lighting devices and image reading devices, can solve the problems of deterioration of original reproducibility, poor reproducibility of originals, and large difference in image information density, etc., and achieve the effect of reducing unnecessary light beams

Inactive Publication Date: 2009-10-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the difference in density of the image information read from the document becomes large, and the reproduction of the document is poor.
[0011] In general, the reproducibility of originals also tends to deteriorate in lighting devices using high-beam lights.

Method used

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  • Document illuminating device, image access device and image forming device
  • Document illuminating device, image access device and image forming device
  • Document illuminating device, image access device and image forming device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0098] figure 2 It is a schematic sectional view of the document illuminating device provided with two fluorescent lamps according to the first embodiment of the present invention. In the document illuminating device 31 of this embodiment, the light sources 2-1, 2-2 are in the shape of long axis cylinders, and the light beams emitted from the light sources 2-1, 2-2 are reflected by the reflectors 1-1, 1-2 respectively. 2 Collect light to illuminate the document reading area of ​​the document surface placed on the platen glass 3 of the document stage. The document illuminating device 31 is provided with two fluorescent lamps (for example, Figure 8 The xenon lamp (xenon lamp) 2-1, 2-2 of structure as shown is used as light source, and it has opening, and simultaneously, is provided with two reflectors 1-1, 1-2 that are elliptical shape, respectively from two fluorescent lamps 2- 1, 2-2 light beams are collected, the openings 2a of the two fluorescent lamps 2-1, 2-2 are set to...

no. 2 example

[0122] image 3 is to extract only figure 2 A schematic cross-sectional view of the elliptical reflector 1-1 and the fluorescent lamp 2-1 on the left. Here, consider a right-angled triangle ( image 3 the middle slash).

[0123] If the long axis direction of the ellipse is set as the X axis, and the short axis direction is the Y axis, then as mentioned above, the ellipse shape of the reflecting plate 1-1 can be expressed by the following formula:

[0124] X 2 A 2 + Y 2 B 2 = 1

[0125] (A>B>0)

[0126] The distance between the two foci is D, and the inclination angle of the ellipse is θ, then the Y coordinate of the apex of the right triangle is:

[0127] y = D · sin θ · ...

no. 3 example

[0133] Figure 4 It is a schematic cross-sectional view of a document illuminating device according to a second embodiment of the present invention. Figure 4 and figure 2The difference is that reflectors 1-1, 1-2 are made into an ellipse, and one focus of the ellipse (points b and c in the figure) is arranged at the following position: when the fluorescent lamps 2-1, 2-2 are connected The point on the straight line between the center and the center of the opening (position of φ / 2) and intersects the diameter of the lamp tube. Place the other focal point (point a in the figure) near the original illumination position on the optical axis. The φ is the opening angle of the fluorescent lamp.

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Abstract

The present invention relates to a document illuminating device, an image reading device using the document illuminating device, and an image forming device provided with the image reading device. The original illuminating device 31 is provided with fluorescent lamps 2-1, 2-2 as light sources, and the fluorescent lamps have openings 2a for emitting light beams, and are provided with reflectors 1-1, 1-2 in an elliptical shape to condense the light beams from the fluorescent lamps, respectively. The opening of the fluorescent lamp is arranged obliquely downward, and the reflector is arranged obliquely below the fluorescent lamp. The light beam emitted from the opening of the fluorescent lamp is focused to the document reading area through the reflector. One focal point of the reflector is arranged on the straight line connecting the center of the fluorescent lamp and the center of the opening, and the other focal point is arranged near the document reading position. The light from the fluorescent lamp does not directly irradiate the original illuminating part, but only uses the concentrated beam guided by the reflector, does not irradiate the area that does not need to be irradiated, and does not affect the reflection density of the original, which can achieve high efficiency and reduce unnecessary light beams. Original lighting device.

Description

technical field [0001] The present invention relates to a document illuminating device and an image reading device using the document illuminating device, and more particularly, to a document illuminating device capable of realizing high light intensity and low flare illumination by using a fluorescent lamp as a light source, and an image reading device using the document illuminating device The device also relates to an image forming device such as a copier, a facsimile, a multifunction machine (having functions such as a copier, a printer, and a facsimile) equipped with the image reading device. Background technique [0002] For example, in JP-A-2000-307809 (hereinafter abbreviated as "Patent Document 1"), JP-A-2004-235861 (hereinafter abbreviated as "Patent Document 2"), JP-A-2003-283820 (hereinafter abbreviated as "Patent Document 2"), Denoted as "Patent Document 3"), Japanese Unexamined Publication No. P11-237699 (hereinafter abbreviated as "Patent Document 4"), and Jap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/04
Inventor 三尻晋松井秀彰
Owner RICOH KK
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