JPS59189363A - Light source device of color copying machine - Google Patents

Abstract

PURPOSE:To speed up color copying operation by providing plural kinds of phosphors which differ in main wavelength on a transparent body, irradiating those phosphors with ultraviolet rays and generating visible rays, and exposing an original to be copied to the light successively. CONSTITUTION:A light source device 8 consists of a light source 5' consisting of an aperture type ultraviolet-ray generating lamp having an ultraviolet-ray reflecting layer 5a on the internal surface of a tube wall and the transparent body 1' provided with phosphors 2', 3', and 4' of blue, green, and red at equal circumferential intervals. When the copying of the original 6 placed on a platen is started, the blue phosphor 2' on the transparent body 1' is positioned firstly between the light source 5' and original 6 to irradiate the original with ultraviolet rays from the light source 5', and the phosphor 2' generates blue visible rays. The visible rays illuminate the original 6 through a reflecting mirror 10 and the surface of the original 6 is scanned and exposed by the movement of the light source device 8. Then, the transparent body 1' is rotated to move the green phosphor 3' and red phosphor 4' to between the light source 5' and original 6, and the original 6 is scanned and exposed successively to obtain a color copy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a light source device for a color copying machine that exposes a document to be copied.

Prior Art Conventional color copying machines that repeat exposure, development, and transfer multiple times for each color use a halogen lamp as a light source, as shown in Figure 1 (a), and one that uses a halogen lamp as a light source, as shown in Figure 1 (b). One that uses a fluorescent light is known. As shown in Fig. 1 (A), in the case of using a halogen lamp α, the light emitted from the halogen lamp α is reflected by a mirror, and the platen d is
The reflected light from the original e is guided to the upper original document e through a color separation filter f to a photoreceptor (not shown), and a plurality of color separation filters f are prepared. By using these alternately, each color is separated as shown in Figure 2 (a) and the photoreceptor is exposed for each color.Furthermore, the fluorescent lamp shown in Figure 1 (b),! 7 also uses a fluorescent lamp y to illuminate an original e on a platen d, and the reflected light is passed alternately through a plurality of color separation filters f and guided to a photoreceptor, exposing the photoreceptor. There is.

This kind of exposure equipment requires approximately 3 to 6 times the amount of light compared to black and white copying, so if a halogen lamp α is used as the light source, the lamp consumption will be large, resulting in an increase in the power consumption of the entire copying machine. There is a drawback that you have to use a fluorescent light! When I is used as a light source, the amount of light is insufficient, so it is necessary to slow down the exposure speed, which has the disadvantage of causing a reduction in copying speed.

Purpose of the Invention The present invention has been made for the purpose of improving the above-mentioned drawbacks, and provides a color copying machine that consumes less power than conventional halogen lamps and can increase the copying speed compared to white fluorescent lamps. The present invention aims to provide a light source device.

Structure of the Invention A plurality of types of phosphors having different dominant wavelengths are provided on a transparent body, and these phosphors are irradiated with a beam of ultraviolet light emitted from a light source to generate visible light, and the original to be copied is printed with this light. This is a light source device for a color copying machine that alternately exposes light.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings shown in FIG. 3 and below. First, to explain the present invention in detail, fluorescent materials 2, 3, and 4'i of blue, green, and red having different dominant wavelengths are provided on a transparent body 1 made of ordinary reflective glass by coating or the like. Reference numeral 5 denotes a light source that generates ultraviolet rays, and the tube wall is made of special glass (for example, quartz glass) having a transmittance characteristic that sufficiently transmits even 253.7 nm wavelength light as shown in FIG. 4A. Incidentally, Figure B shows the transmittance characteristics of the transparent body 1 of a normal fluorescent lamp, which has the characteristic of absorbing ultraviolet rays of 253.7 nm.

253. generated from the light source 5. The phosphors 2, 3.4 on the transparent plate 1 are sequentially positioned in the beam of full-meter ultraviolet rays, and visible rays of blue, green, and red are generated from these phosphors 2.3.4. The document 6 to be copied is alternately exposed to visible light and used for copying.
Transparent body 1 that absorbs 7 nm ultraviolet rays is fluorescent body 2, 3.4
It also has the ability to block ultraviolet rays that try to pass through without being absorbed.

The principle of the present invention has been described above. Next, an example implemented in a copying machine will be described in detail with reference to FIGS. 5 and 6. Reference numeral 7 denotes a platen on which a document 6 to be copied is placed, and a light source device 8 is provided below this platen 7. The light source device 8 includes a light beam 5', which is an aperture type ultraviolet generating lamp, which has a reflective layer 5α that reflects ultraviolet g (253,7TL771) formed on the inner surface of the tube wall by means such as coating or vapor deposition, and this light source 5'. It consists of a tubular transparent body 1' provided around the light source 5' with its center aligned with the light source 5', and on the inner peripheral surface of the transparent body 1', blue, green, and red fluorescent lights are arranged at equal intervals in the circumferential direction. Body 2F, 3
Provided at F, t, and r. In addition, the transparent body 1'
can be rotated around the center O of the light source 5' by a rotational drive source (not shown), and each phosphor 2', 3F is rotated during the process of obtaining one copy.

4' is sequentially rotated so that it is positioned between the light source 5' and the document 60 to be copied.

That is, when the original 6 to be copied is placed on the platen 7 and copying is started, the blue phosphor 2' on the transparent body 1' is first positioned between the light source 5' and the original 6, and the light source 5' The phosphor 2' is irradiated with ultraviolet rays from the phosphor 2', and the phosphor 2' emits blue visible light.

The visible light rays are irradiated onto the original 6 directly or via the reflecting mirror 10, and the surface of the original 6 is scanned and exposed by movement of the light source device 8 (or movement of the original).

The reflected light image from the original document 6 is guided to a photoreceptor by an optical system (not shown), and transferred to a sheet of paper through a normal development and transfer process.

Thereafter, the transparent body 1' is rotated, the green phosphor 3' and the red phosphor 4' are moved between the light source 5' and the original 6, and the original 6 is sequentially scanned and exposed. That is, when copying one sheet, scanning exposure is performed three times, and a color copy can be obtained.

Note that the development and transfer steps are the same as those of the conventional method, so explanations thereof will be omitted.

In addition, phosphors 2F, 3F, and phosphors provided on the transparent body 1'
As a modification of 4F, the transparent body 1' may be a transparent film, and the phosphors 2, 3, 4'& may be provided on this film, and the film may be slid above the light source 5, and the peripheral area of the light source 5 may be A reflector is provided on the reflector, phosphors 2, 3.4 are provided on the reflector, and the phosphors 2, 3, 4 are selectively irradiated with light from a light source 5 to generate visible light. Good too.

Further, as shown in FIG. 6, phosphors 2', 3', and 4' are successively provided at narrow intervals on the tubular transparent body 1', and these are rotatably provided around the light source 5. By controlling the rotation angle of ', it can also be used as a fine adjustment mechanism for images.

Effects of the Invention According to this invention, the power consumption is about 90% more economical than that using a conventional halogen lamp as a light source, and the amount of light is about 3 times as much as that using a white gold light lamp as a light source. Therefore, the copying speed can be increased.

[Brief explanation of drawings]

Figures 1 (a) and (b) are explanatory diagrams of a conventional scanning exposure device;
Figures 2 (a) and (b) are explanatory diagrams showing the same spectral characteristics, and Figure 3
4 and 4 are diagrams of the principle of the invention, FIG. 5 is a sectional view showing one embodiment of the invention, and FIG. 6 is an explanatory diagram of another embodiment. 1 is a transparent body, 2, 3.4 is a fluorescent body, 5 is a light source, and 6 is a manuscript. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto (7) Figure 1 (A) (B) 2
Figure (a) (b) Figure 3

Claims (1)

[Claims] A plurality of types of phosphors 2.3.4 having different dominant wavelengths are provided on the transparent body 1, and these phosphors 2, 3.4 are irradiated with ultraviolet rays emitted from a light source 5 to generate visible light, A light source device for a color copying machine is characterized in that the document 6 to be copied is sequentially scanned and exposed to this visible light.