JPH02228643A - copying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an apparatus for projecting and copying an image of a subject onto a photoreceptor.

[Prior Art] In conventional copying devices, the product of the spectral sensitivity distribution of a photoreceptor on which an image of a subject is projected and the spectral distribution of diverging light from a subject such as a document is close to the visibility distribution. A specific wavelength band cut filter is placed in the open optical path between the subject and the photoconductor, and the image light from the subject is projected onto the photoconductor via this filter.

[Problems to be Solved by the Invention] However, with this configuration, if the wavelength band of the spectral sensitivity distribution of the photoreceptor is narrower than the visibility distribution band, it becomes impossible to reproduce the density of the color of the subject.

Furthermore, when a lens is used as a means for transmitting an object image to a photoreceptor, it is necessary to correct the chromatic aberration of the lens, which requires the lens to be complicated and expensive.

Therefore, in order to solve the above-mentioned problems, it is an object of the present invention to provide a wavelength conversion means, which will be described later, so that, for example, the color density of an object can be changed to the density of wavelength light within the wavelength band of the spectral sensitivity distribution of the photoreceptor. The object of the present invention is to provide a copying apparatus that can reproduce reproductions.

[Summary of the Invention] In order to achieve the above object, the present invention provides a method that absorbs a specific wavelength or wavelength range component of diverging light from the subject and emits light of another specific wavelength or wavelength range. A conversion means is provided, through which the object image light is projected onto the photoreceptor.

More specifically, for example, among the diverging light from the subject, a light component with a wavelength that is within the band of the luminous efficiency spectral distribution but outside the spectral sensitivity distribution band of the photoreceptor is a light component with a wavelength that is within the spectral sensitivity band of the photoreceptor. is converted by the wavelength conversion means and emitted, thereby making it possible to reproduce the color density of the subject with this photoconductor even if a photoconductor having a spectral sensitivity distribution narrower than the spectral distribution band of visibility is used. .

[Example] FIG. 1 shows a schematic configuration of an embodiment of the present invention.

In the figure, 1 is a light source lamp, 2 is a condenser lens for condensing the light from the light source lamp 1 and projecting it onto the original 3, and 4 is a specific wavelength or wavelength band component of the passing divergent light from the original 3. 5 is a document platen glass for holding the document 3 and the wavelength conversion device 4; 6 is a photoreceptor for transmitting the image light passing from the document platen glass 5; This is an imaging lens for projecting and forming an image on 7.

In the copying apparatus configured as described above, the original 3 illuminated by the light source lamp 1 passes through and diverges light having a wavelength corresponding to the image information thereon, and this light enters the wavelength converting means 4. Since this means 4 is made of a fluorescent material such as a perylene-based material, the spectral distribution A shown in FIG. The spectral distribution of B is shown in the figure. On the other hand, this fluorescent material
Since light is emitted with the spectral distribution of b in the figure, B and b in Figure 3
Light is emitted from the wavelength converting means 4 with the spectral distribution C in FIG. 4, which is a mixture of the distributions.

This emitted light is converted into light having a spectral distribution D in FIG. 5 by an imaging lens 6 having a spectral transmittance of C in FIG. 4, and is imaged on the photoreceptor 7. Here, since the wavelength band that the photoreceptor 7 actually senses has the spectral distribution of d in FIG.
The amount of light that the photoreceptor 7 senses is shown by the spectral distribution shown by E in FIG.

As shown in FIG. 7, as shown in FIG. In other words, by absorbing the former light (indicated by a in FIG. 7) and emitting light within the photoconductor sensitivity wavelength band (indicated by b in FIG. 7), the photoconductor 7 absorbs the original 3. You will be able to perceive a monochrome image with the same density as when you see it with your eyes.

Therefore, the photoreceptor 7 does not need to have a spectral sensitivity distribution that covers the entire visibility wavelength band, and a narrow sensitivity distribution suffices, which simplifies the film and material composition of the photoreceptor, reducing design, quality, and cost. The burden is reduced.

In addition, if the photoreceptor 7 has a sensitivity distribution wider than the visibility spectral distribution band, or if the spectral distribution of the entire system in the optical path and the visibility spectral distribution do not match, the image may be transmitted through a specific wavelength cut filter. There is less energy loss to the photoreceptor's sensitivity capability than if light had to be projected onto the photoreceptor.

Furthermore, since the imaging lens 6 only needs to form an image of light in a specific wavelength band, correction of chromatic aberration becomes easy, a simple lens configuration is required, and it is advantageous in terms of cost.

The embodiments described above relate to monochrome copying, but the following method allows color subject image information to be transferred to the photoreceptor 7.
can be given to

That is, when receiving blue (B) component molecules as shown in Fig. 9, a fluorescent substance that absorbs as shown by a' and emits light as shown by b' is used, and as shown in Fig. 10, a (green CG) component g is received. When receiving the red (R) component, use a fluorescent substance that has absorption shown by a'' and emission shown by b', and furthermore uses a fluorescent substance that has absorption shown by a'' and emission shown by b'', and further uses a fluorescent substance that has absorption shown by a' and emission shown by b'' when receiving red (R) component light. By using a fluorescent substance that emits light as shown in FIG. (by guiding it to each photoreceptor via the wavelength conversion means used)
, d, color image information is given to the photoreceptor 7 which monitors the photoreceptor spectral sensitivity distribution. In this case, in addition to the RGB separation used in additive color mixing, Y (yellow), M (magenta), C (cyan) separation, etc. used in subtractive color mixing may be used.

Further, the wavelength converting means 4 may be one that absorbs light of a specific wavelength or wavelength range and emits light outside the photoreceptor sensitivity distribution wavelength band, or the absorption wavelength band of the wavelength converting means is excluded by a specific wavelength. If the wavelength conversion means does not absorb this specific wavelength light and the photoreceptor is made insensitive to this specific wavelength, then the area of the subject that emits light at this specific wavelength or wavelength range will be Depending on the developing method (negative or positive), the colors will be enhanced or erased.

Furthermore, if the wavelength conversion means 4 absorbs infrared light or ultraviolet light outside the visibility distribution and emits light with a wavelength within the photoreceptor sensitivity distribution band, infrared development or ultraviolet development is also possible.

[Effects of the Invention] As described above, the present invention is provided with a wavelength conversion means that absorbs a specific wavelength or wavelength range component of the diverging light from the subject and emits light of another specific wavelength or wavelength range. Copying with various properties becomes possible depending on the relationship or degree of overlap between the luminous efficiency distribution, the spectral sensitivity distribution of the photoreceptor, the spectral distribution of divergent light of the subject, the absorption distribution and emission distribution of the wavelength conversion means, etc.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a diagram showing the relationship between the spectral distribution of original illumination light and the absorption spectral distribution of the fluorescent material, and Figure 3 is the spectral distribution after absorption by the fluorescent material. Figure 4 is a diagram showing the relationship between the spectral distribution of the luminescence of the fluorescent material and the spectral transmittance of the imaging lens. A diagram showing the relationship between the spectral distribution and the spectral sensitivity distribution of the photoreceptor. Figure 6 is a diagram showing the spectral intensity distribution felt by the photoreceptor. Figure 7 is the luminosity spectral distribution, fluorescent material absorption spectral distribution, and fluorescent material. Figure 8 shows the relationship between the absorption spectral distribution and emission spectral distribution of the fluorescent substance for blue reading and the spectral sensitivity distribution of the photoreceptor; Figure 9 shows the relationship between the spectral sensitivity distribution of the photoreceptor and the fluorescent material for green reading. FIG. 10 shows a similar relationship for red reading fluorescent materials. 1...Light source lamp for illumination, 2...Condenser lens, 3...Document, 4...Wavelength conversion means made of fluorescent substance, 5...Document base glass,
6...Imaging lens, 7...Photoreceptor

Claims (1)

[Scope of Claims] 1. In a copying device in which image light from an object is projected onto a photoreceptor, a specific wavelength or wavelength range component of the light from the object is absorbed, and light of another specific wavelength or wavelength range is emitted. A copying apparatus characterized in that image light from a subject is projected onto a photoreceptor through wavelength conversion means. 2. The wavelength conversion means absorbs light in a wavelength band that is within the visibility spectral distribution band but outside the spectral sensitivity distribution band of the photoreceptor and emits light within the spectral sensitivity distribution band of the photoreceptor. Copying device as described. 3. The copying apparatus according to claim 1, wherein said wavelength conversion means is made of a fluorescent material. 4. The copying apparatus according to claim 1, 2 or 3, wherein the wavelength conversion means is provided close to or in close contact with the copying object.