JPS642190Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a lamp reflector for a light source of a reading device.

Prior Art and Problems FIG. 1 is a diagram for explaining the configuration of a conventional reading device. In the figure, 1 is a document table using a glass plate, 2 is a light source, 3 is its reflector, 4 and 5
1 is a mirror, 6 is a lens, 7 is a fixed image sensor, and 8 is a document. Note that the reflection plate 3 is formed so that its axis-perpendicular cross section forms part of an ellipse, and the light source 2 is arranged at one focal position, and the other focal position, that is, the imaging position of the light source image is located near the original 8. It is arranged as follows. In this apparatus, a document table 1 moves in the direction X-X', and a document 8 placed on the document table 1 is irradiated by a long light source 2 provided perpendicular to the direction of movement. The light reflected from the original 8 is reflected by mirrors 4 and 5 and focused on an image sensor 7 by a lens 6. The image sensor 7 scans the original in a direction perpendicular to its moving direction X-X' and reads the original.

In such a reading device, the light source is
When using the halogen lamp shown in the figure, the light from the filament 9 is strong, so the reflection plate 3, document table 1,
It is reflected by the mirrors 4 and 5 and directly enters the image sensor 7, and even when reading a black original as shown in Fig. 2b, a peak 1 corresponding to the white level corresponding to the filament of the light source is generated.
There was a drawback that 0 appeared and a striped pattern appeared on the recording paper that was read.

Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, an object of the present invention is to provide a lamp reflector plate that averages out the amount of light from a light source in a reading device.

Structure of the invention According to the invention, in a reading device that condenses light from a light source and irradiates it onto the original through a document table on which an original is placed, the light emitted from the light source is reflected by a lamp reflector and becomes a convergent beam. A lamp reflector for a reading device, characterized in that a part of the reflector is provided with anti-reflection means so that a part of the light beam does not enter a solid-state image sensor due to surface reflection on a glass plate surface of a document table. This is achieved by providing

Examples of ideas Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a diagram for explaining a lamp reflector according to the present invention. In the figure, 11 is a manuscript table;
12 is a light source, 13 is a lamp reflector, 14 and 15 are mirrors, 16 is a lens, 17 is a solid-state image sensor, 2
1 indicates the original, and point B indicates the point at which the original should be read. Note that the reflection plate 13 is formed so that its axis-perpendicular cross section forms part of an ellipse, and the light source 12 is arranged at one focal position, and the other focal position is arranged near the original 21. is similar to the conventional example explained in FIG.

In figure a, the light emitted from the light source 12 is the original 21
The diffusely reflected light 22 is reflected by the mirrors 14 and 15.
However, the light 18 specularly reflected from the surface of the document table 11 does not enter the mirror 14 .
However, the light emitted from the light source 12 and the lamp reflector 13 is
The light 19 reflected at the point is specularly reflected at the point B of the document table 11 and enters the image pickup device 17 via the mirrors 14 and 15, causing the above-mentioned problem. In order to eliminate the light that is specularly reflected on the surface of the document table 11 and enters the image sensor 17, the present invention is designed so that there is no reflection of light in the vicinity of point A of the lamp reflector 13, as shown in Figure b. For example, a black tape 20 may be applied.

In this embodiment configured in this way, the black tape 20 eliminates the reflected light 19 shown in FIG. 3a, so the problem shown in FIG. be done.

Effects of the Invention As explained above in detail, the lamp reflector of the reading device of the present invention prevents the reflected light from the light source from being reflected on the document table and entering the image sensor, and is used in the reading device. This has a great effect in improving the recording quality.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the structure of a conventional reading device, Figure 2 is a diagram for explaining a halogen lamp and the striped pattern on recording paper caused by the halogen lamp, and Figure 3 is a diagram for explaining the structure of a conventional reading device. FIG. 3 is a diagram for explaining a lamp reflector of the device. In the drawing, 11 is a document table, 12 is a light source, 1
3 is a lamp reflector, 14 and 15 are mirrors, 16 is a lens, 17 is a solid-state image sensor, and 20 is a black tape.

Claims (1)

[Scope of utility model registration request] In a reading device that condenses light from a light source and irradiates it onto the document through the document table on which the document is placed, a portion of the light beam emitted from the light source, reflected by the lamp reflector, and turned into a convergent beam strikes the glass plate surface of the document table. 1. A lamp reflector for a reading device, characterized in that a part of the reflector is provided with anti-reflection means to prevent surface reflection from entering a solid-state image sensor.