JPS6014227A - Exposing device of copying machine - Google Patents

Abstract

PURPOSE:To illuminate uniformly a copying surface by using the reflected light of a lamp light source, by placing plural diffusion reflecting surfaces on the lower part of a platen glass, and also placing a flash lamp light source provided with a blocker on the back, on a position corresponding to said reflecting surface. CONSTITUTION:Diffusion reflecting members 22, 23 whose section is formed in a roughly chevron shape are placed symmetrically on the lower part of a platen glass 21 of an exposing device 20. The illuminating light irradiated from flash lamp light sources 24, 25 placed symmetrically on its inside is led to diffusion reflecting surfaces 22a, 23a by blockers 26, 27, and also this illuminating light is diffused by the reflecting surfaces 22a, 23a and illuminates uniformly the platen glass 21 by the sufficient intensity of illumination.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure apparatus for a copying machine using a flood-lamp light source, and more particularly to an improvement in the illumination structure of the exposure apparatus.

[Prior art]

Generally speaking, among exposure devices in copying machines, exposure devices that use a flash lamp light source (hereinafter simply referred to as a lamp light source) illuminate the copy surface with a high brightness output for a very short light emission time. It is difficult to illuminate uniformly. Conventionally, lamp light sources 4 are arranged at each of the four corners of a casing 3 that supports the platen glass 2, as shown in a cutaway perspective view of the main parts of the exposure apparatus 1 shown in FIG. A copy original (not shown) placed on the top surface of the copying device is directly illuminated to uniformly illuminate the copy surface. In addition, the code 5 in FIG. 1 is the housing 3.
The projection lens disposed on the bottom of the lamp light source 4
This is a blocker that guides the illumination light to the platen glass 2.

By the way, since the exposure apparatus 1 shown in FIG. 1 has a configuration in which the illumination light from the flash lamp 4 is directly guided to the platen glass 2, the platen cover (not shown) that covers the top surface of the platen glass 2 is left open. If copying work is performed in this state, the worker's vision will be severely stimulated, so the design is such that copying work is not possible in this state.

In addition, in order to solve the above-mentioned problems, in the conventional exposure apparatus 10 shown in the cross-sectional view of FIG. The illumination light from the lamp light source 13 is guided into a high reflection cavity 15 by a blocker 14 placed above the lamp light source 13, and the reflected light from this cavity 15 is guided to a platen glass 11 which is a copying surface. However, in order to guide the illumination light of this lamp light source 13 into the high reflection cavity 15, a blocker 14 is placed above the lamp light source 13, so this blocker 14 blocks the platen glass 11 directly above the lamp light source 13. It is difficult to guide the reflected light to the surface of the photocopying surface, and this has the disadvantage that it tends to cause uneven illuminance when illuminating the copying surface.

In FIG. 2, numeral 16 is a projection lens, 17 is a photosensitive material surface,
Reference numeral 18 is a jammer plate, and this jammer plate 18 is a lamp light source 13.
This prevents direct light from entering the projection lens 16.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an exposure device for a copying machine that can uniformly illuminate a copying surface using reflected light from a lamp light source.

[Structure of the Invention] To achieve this object, the present invention arranges a plurality of diffuse reflection surfaces below the platen glass, and also provides blockers on the back surface at positions corresponding to the plurality of reflection surfaces.
A flash lamp light source equipped with a flash lamp light source is disposed, and the illumination light from the lamp light source is guided by blockers to corresponding diffuse reflection surfaces, and the platen glass surface is illuminated by the reflected light from the plurality of diffuse reflection surfaces. This is what I did.

〔Example〕

Hereinafter, one embodiment of the exposure apparatus for a copying machine according to the present invention will be described in detail.

FIG. 3 is a sectional view of a main part of an exposure apparatus 20 according to the present invention.

In this exposure apparatus 20, below the platen glass 21, diffuse reflection members 22 and 23 each having a substantially doglegged cross section are arranged symmetrically. In addition, this diffuse reflection member 2
2. On the inside of 23 are diffuse reflection surfaces 22a and 23a, respectively.
Further, flash lamp light sources 24 are provided at positions corresponding to the diffuse reflection surfaces 22a and 23at of the tongue pieces 22b and 23b formed to protrude downward.
．． 25 are arranged. This flash lamp light source 2
Blockers 26 and 27 are arranged on the back side of the 4° 25, and the blockers 26 and 27 reflect the illumination light from the flood lamp light sources 24 and 25 by reflecting surfaces 26a and 27a formed inside the blockers 26 and 27, respectively. The light is guided to diffuse reflection surfaces 22a and 23a. In addition, in FIG. 2, reference numeral 28 indicates a projection lens;
9 is a light shielding material, and 30 is a sensitive material surface.

According to the above-described configuration, the illumination light emitted from the symmetrically arranged flash lamp light sources 24 and 25 is diffused by the blockers 26 and 27 onto the diffuse reflection surfaces 22a and 23a.
The illumination light guided to the diffuse reflection surfaces 22a and 23a is directed to the reflection surfaces 22a and 23a.

23a, and uniformly illuminates the platen glass 21 with sufficient illuminance.

In the above embodiment, below the platen glass 21,
A pair of diffuse reflection surfaces 22a and 23a symmetrically with respect to the drawing
However, the present invention is of course not limited to the above-mentioned embodiment, and may include a pair of diffuse reflection surfaces and a flash lamp light source that are further symmetrical with respect to the vertical direction of the drawing. You may also place

〔Effect of the invention〕

The present invention uses a plurality of flash lamp light sources, guides the illumination light to a diffuse reflection surface, and illuminates the platen glass surface with the reflected light from the reflection surface, so that the direct light from the flash lamp light source illuminates the platen glass. external ζ via
There is no leakage, so copying can be performed even with the platen cover open, and since a plurality of flash lamp light sources are used, the copying surface can be uniformly illuminated.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of main parts showing an exposure device of a conventional copying machine, FIG. 2 is a sectional view of main parts of another conventional example, and FIG. 3 is a main part showing an exposure device of a copying machine according to the present invention. FIG. 20... Exposure device, 21... Platen glass, 22
a. 23a...Diffuse reflection surface, 24.25...Flash lamp light source, 26.27...Blocker (7) Fig. 2 1゜

Claims (1)

[Claims] In an exposure device ζ of a copying machine that illuminates a platen glass surface using a flash lamp light source, a plurality of diffuse reflection surfaces are arranged below the platen glass, and a position facing the plurality of reflection surfaces is provided. A flash lamp light source with a blocker on the back is arranged, and the direct light from the lamp light source is guided to the corresponding diffuse reflection surface by the blocker, and
An exposure device for a copying machine, characterized in that a platen glass surface is illuminated by light reflected from the plurality of diffuse reflection surfaces.