JPS5816263A - Original platen - Google Patents

Abstract

PURPOSE:To eliminate factors in image disorder, and to improve both producibility and cost, by molding an original platen body out of a material which contains a mixed dye, and thus, giving the platen the effect of a filter. CONSTITUTION:When an original platen body is moded, a dye is mixed to allow the platen to have the effect of a filter, so a filter member which is necessary conventionally is eliminated to remove factors in the strain of the filter member, and image disorder dur to distorsion and/or stains. Further, the number of parts is decreased to improve both producibility and cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an image forming apparatus for a copying machine or the like in which a light beam from a light source is applied to a document on a transparent document table, and the reflected light is projected onto a photoreceptor through an optical system. The present invention relates to a document mounting table in an apparatus.

For example, it is well known that when copying is performed using an electronic copying machine, a satisfactory copy image may not be obtained depending on the color of the information to be copied on the document.

This is because the wavelength range of light that can be absorbed by the photoconductive layer of the photoreceptor and cause a photoconductive phenomenon is determined for each substance constituting the photoconductive layer. Therefore, conventionally, a filter member was installed in the exposure light path to cut off part of the wavelength range of the exposure light. In this way, providing one filter strip in the exposure optical path means that if there is physical distortion in this filter member, the exposure light beam will be disturbed, and the vibration of the electronic copying machine will cause A similar result will occur if the filter member vibrates. In addition, when the filter is installed near the lens of the optical system, the exposure light beam is narrowed down to a small fc state, so if the filter material becomes dirty or uneven, it will greatly affect the reproduced image. . Further, there are disadvantages in that it is disadvantageous in terms of cost to newly provide one filter member in the exposure optical path.

As mentioned above, conventional image forming apparatuses have been configured to apply a light beam from a light source to a document on a transparent document table, and to form an image by projecting the reflected light onto a photoreceptor through an optical system. In particular, this method has drawbacks based on the spectral sensitivity characteristics of the photoreceptor, and the provision of a new filter member in the exposure optical path to eliminate such drawbacks causes various other defects.

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and the main body of the document mounting table is formed by molding a material mixed with dye, and it has the effect of a filter to improve the spectral characteristics of the photoreceptor and the wavelength of the light source. An object of the present invention is to provide a document mounting table that applies light having wavelength characteristics according to distribution to a photoreceptor.

The embodiments shown in the drawings will be described below.

FIG. 1 shows an embodiment of the present invention, in which a dye-containing material is molded to change the wavelength distribution of light from an original in accordance with the spectral sensitivity characteristics of a photoreceptor. This is a perspective view of the main body of the original placing table which is integrally formed and has the effect of a filter. In the figure, 1 is the original placing surface, 2 is the abutment member for setting the original position, and 3 is the step part for setting the original position. show.

FIG. 2 schematically shows only the main parts of the exposure optical system when Se is used as a photosensitive drum.

ml, m2, and m3 are reflecting mirrors, 4 is an original table, 5 is an original, 6 is a light source, 7 is an in-mirror lens system, and 8 is a photosensitive drum. The spectral sensitivity characteristics of the above Ss photosensitive drum are shown in FIG. As can be seen in Figure 3, the Se photoreceptor has high sensitivity to the blue region1.Therefore, by molding a material mixed with red dye into the main body of the document mounting table, the effect of the red filter is It is possible to provide a document mounting table having a width. FIG. 4 shows the filter characteristics of the colored mold document mounting table as described above. It can be seen that the transmittance of light in the blue region is low. Therefore, when copying is performed using the photosensitive drum and the document mounting table, blue characters can also be copied.

In addition, for photoconductors with different spectral sensitivities, it is natural to be able to obtain copies that fully satisfy the color information to be copied by appropriately selecting the dye to be mixed into the main body of the molded document holder. It is possible to create a filter effect.

As described above, in conventional image forming apparatuses such as copying machines, a filter member is inserted into the exposure optical path in order to match the spectral sensitivity of the photoreceptor. When molding, by mixing dye, it is possible to give the document mounting table the effect of a filter, and it is possible to remove part of the filter that was previously required, thereby reducing the distortion of the filter material. This has the advantage of eliminating the causes of image disturbance due to dirt, etc., and at the same time reduces the number of parts, improving both productivity and cost.

Furthermore, when actually copying a document, compared to a conventional transparent document tray, a colored document tray clearly shows its presence and has the psychological effect of allowing the user to place the document with a sense of stability. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the document placement table according to the present invention, FIG. 2 is a schematic diagram of an exposure optical system using the document placement table, and FIG. 3 is a spectral sensitivity characteristic diagram of the Se photoreceptor. FIG. 4 is a characteristic diagram showing the filter effect of the original table. 1... Document placement surface 2... Matching member 3.
...Stepped portion 4...Document mounting table 5...Document 6...Light source 7...In-mill lens system 8...Photosensitive drum (5)

Claims (1)

[Claims] In the original stage of an image forming apparatus, the main body of the original stage is formed by molding a dye-containing material so as to change the wavelength distribution of light from the original according to the spectral sensitivity characteristics of the photoreceptor. A document mounting stand characterized by having a filter effect.