JPH0361943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illumination device in a full exposure type exposure device used in a copying machine.
In particular, it concerns the use of a closed housing whose inner surface is coated with a highly diffusing and reversing substance, as shown in Japanese Patent Application Laid-Open No. 55-115058.

Conventionally, this type of lighting device has a lamp mounted on the side wall of a closed housing with a platen on the top and a lens on the bottom, and a lamp cover on the top of the lamp to prevent the light from the lamp from directly entering the operator's eyes. A device is known in which a flat blocker is provided between the lamp and the lens to prevent the light from the lamp from directly entering the lens.

However, with this device, part of the light from the lamp is blocked by the flat blocker, reducing the amount of light irradiated to the platen, and depending on the background of the original, the shadow of the blocker may appear on the copy. Since Brotzker was semi-transparent, it had the problem of poor lighting efficiency.

The present invention was made in view of the above circumstances, and its purpose is to prevent lamp light from directly entering the lens, and to improve illumination efficiency by irradiating the platen with uniform lamp light. An object of the present invention is to provide an illumination device for a full-surface exposure device of a copying machine.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view of the housing A.
The bottom wall 1 and the left and right/front and rear side walls 2, 3, 4, and 5 form a housing with an upper opening, and the upper opening 6 is sealed with a platen 7 provided therein.

A mounting hole 8 is formed approximately in the center of the bottom wall 1,
A lens 9 is attached to the attachment hole 8, and
On the left side wall 2, a lamp cover 10, a lamp 11, and a reflector 12 are arranged in order at intervals in the vertical direction, and the lamp cover 10 prevents the light of the lamp 11 from being directly irradiated onto the platen 7. It is designed to prevent direct light from entering the eyes.

A blocker 13 is provided between the lens 9 and the lamp 11 on the bottom wall 1, and the blocker 13 is attached to both sides 14 of the mounting vertical member (stand) 14.
a, 14a, a plurality of horizontal plates 15 serving as light reflecting plates are provided along the horizontal plane at intervals in the vertical direction, and specifically, bent pieces 15 at the ends of the horizontal plates 15
a with bolts 16 on both sides 14a of the vertical plate 14,
It is fastened to the horizontal plate 14a so that the mounting angle can be changed, and the surface of the horizontal plate 15 is coated with a highly diffusive and reflective material.

Incidentally, the inner surfaces of each of the side walls 2, 3, 4, and 5 are also coated with a highly diffusive and reflective substance.

As shown in FIG. Since the light is irradiated toward the platen 7 without being blocked, the light from the lamp 11 can be effectively used for irradiating the platen, and the illumination efficiency can be improved.

Further, by changing the mounting angle of the horizontal plate 15, the reflection direction can be changed, so that a portion of the platen 7 where the amount of light is insufficient can be irradiated with light.

As the present invention has been described in detail above, it is compared to a conventional full-exposure type copying machine in which light directed directly from the lamp toward the lens is blocked by a single blocker and diffusely reflected toward the lamp. It has the following excellent effects: With a single blocker, the light is diffusely reflected back to the lamp side, and this is then used to illuminate the platen side, so there is no attenuation or loss due to light reflection. However, in the present invention, the light from the lamp is directed toward the platen side with a minimum number of reflections, so there is an advantage that there is less attenuation or loss in the light reflection process; Since the light is diffusely reflected by multiple blockers, the illuminance is less likely to be high in some areas than with a single blocker, and the light is more dispersed and diffusely reflected; This has the effect of finely adjusting exposure unevenness due to diffuse reflection.

[Brief explanation of drawings]

The drawings show embodiments of the present invention.
The figure is a partially cutaway perspective view, FIG. 2 is a perspective view of the blocker, and FIG. 3 is an explanatory diagram of the operation. A is the housing, 7 is the platen, 9 is the lens,
10 is a lamp cover, 11 is a lamp, 13 is a blocker, and 15 is a light reflecting plate.

Claims (1)

[Claims] 1 Equipped with a platen 7 at the top and a lens 9 at the bottom,
A lamp 11 and its lamp cover 10 are provided on the sides of the closed housing A, the inner surface of which is coated with a highly diffused and reflective substance, so that the light from the lamp 11 is not directly irradiated onto the platen 7, and the above-mentioned A blocker 13 is provided between the lens 9 and the lamp 11 in the lower part of the housing A, and the blocker 13 includes a plurality of light reflecting plates 15 whose surfaces are coated with a highly diffusive and reflective material at intervals in the vertical direction. An irradiation device in a full-surface exposure device of a copying machine, characterized by: