JPH03137630A - Illuminator for copying machine - Google Patents

Abstract

PURPOSE:To uniformly irradiate a microcapsule paper having low sensitivity with light from a metal halide lamp whose light quantity is large by performing shading correction to the metal halide lamp. CONSTITUTION:The metal halide lamp 4 whose light quantity is larger than that of a halogen lamp is used as the light source for the exposure of a copying machine. The shading correction coating 6 is performed to the surface of the lamp 4 so as to make illuminance uniform at a center part as well as at an end part on an original 3 and make a copying speed high. It is desirable to make the light from the lamp 4 incident on a fiber 8 provided with a slit 7 having the same width as the original and irradiate the original with the light outgoing from the slit 7. Furthermore, it is possible to irradiate the original 3 with the light from the lamp 4 which is made to pass from the ends of the plural fibers 8 and projected from the outer ends arranged in a line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application J] The present invention relates to a lighting device for a copying machine, and more particularly to a lighting device for a copying machine using a photosensitive pressure-sensitive recording medium.

[Conventional techniques] Conventionally, halogen lamps have been used as exposure light sources for copying machines.

However, in copying machines that use photosensitive microcapsule paper, the sensitivity of the microcapsules is poor, so
Halogen lamps tended to provide insufficient light.

Therefore, it has been proposed to use a metal halide lamp, which has a higher amount of light for the same amount of power.

[Problems to be Solved by the Invention] However, only spherical metal halide lamps have been manufactured, and there have been no long cylindrical lamps. Therefore, it has been difficult to irradiate a uniform amount of light in a slit shape using a spherical metal pallite lamp.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to irradiate a uniform amount of light in a slit shape using a metal halide lamp.

1. Means for Solving the Problems] In order to achieve this object, a metal halide lamp is used in the illumination device of the copying machine of the present invention, and shading correction is applied to the metal halide lamp, and the light of the metal pararite lamp is It has an optical fiber that outputs in the form of a slit.

[Operation 1] According to the present invention having the above configuration, a uniform amount of light can be irradiated in a slit shape using a metal halide lamp.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

Figure 1 (,) is a configuration diagram of a conventional halogen lamp illumination method.The halogen lamp 1 is longer than the original 1@, and above and below the halogen lamp, the light emitted from the halogen lamp is focused onto the document surface 3. A glue 7 reflector 2 for emitting light is provided.

FIG. 1(b) is a sectional view of FIG. 1(a).

Next, embodiments of the present invention will be described with reference to FIGS. 2 to 5.

First, in the embodiment shown in Fig. 2(,), when the point light source metal halide lamp 4 is turned on α as shown in Fig. 2(b), the illuminance on the document surface is uniform with respect to the width of the document. Arrange several pieces in a row at intervals such that Each metal halide lamp 4 has a reflection @S for condensing light. In this example, when the size of the document changes,
The metal halide lamp can also be turned on or off depending on the size of the document.

Next, another embodiment will be explained with reference to FIG. When a point light source metal halide lamp is used to illuminate the center of the document surface, the illuminance will be different at the center and edges of the document surface (see Figure 3 (a).
)). Therefore, as shown in FIG. 3(b), a surface shading correction coating 6 of the metal halide lamp is applied to make the illuminance on the document surface uniform at the center and edges.

Furthermore, to explain another embodiment with reference to FIG. 4, light from a metal halide lamp is passed through a condenser 9 into a fiber 8 with a slit 7 about the same width as the document width.
The document is irradiated with the light emitted from the slit 7 formed on the side of the 7-eyeper (4th effl(,)).At this time, there is no problem even if the light from the metal hafid lamp enters from both layers of the 7-eyeper. FIG. 4(b) is a sectional view of FIG. 4(a).

Finally, to explain another embodiment using Figure 5, the light from a metal paralite lamp is passed through a condensing device from one side of several 7-eye bars, and the fibers are lined up in a line with the same width as the original document. The light emitted from the other end of the fiber illuminates the original.

Each of the above embodiments is an example of when the metal halide lamp is a point light source.It goes without saying that if the metal halide lamp is shaped like a Heden lamp, it can be used in the same way as a conventional halogen lamp. Nor.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, copying speed can be increased compared to a halogen lamp.

[Brief explanation of the drawing]

Figure 1 is a conventional configuration diagram using an 8C1'f lamp, Figure #52 is a layout diagram of a metal halide lamp showing an embodiment of the present invention, and Figure 3 is a sectional view of a lamp that performs shading correction. FIG. 4 is a configuration diagram of an embodiment in which light is emitted from the side surface of a 7T optical fiber, and FIG. 5 is a front view of an embodiment using a plurality of optical fibers. 1...Halogen lamp, 2...177 rector, 3...
・Document surface, 4...Metal halide lamp, 5...Reflector, 6...Shading correction, 7...Slit, 8...Fiber 9...Concentrator.

Claims (1)

[Scope of Claims] 1. A lighting device for a copying machine using a metal halide lamp as an exposure light source, characterized in that the metal halide lamp is subjected to shading correction. 2. An illumination device for a copying machine that uses a metal halide lamp as an exposure light source, characterized in that it has an optical fiber that outputs light from the metal halide lamp in a slit shape.