JPS59166933A - Illuminating device in full-surface exposing device of copying machine - Google Patents

Abstract

PURPOSE:To irradiate effectively the light of a lamp to a platen, and to raise the illumination efficiency by preventing the direct light of the lamp by a lamp cover, and reflecting the light of the lamp toward the platen by plural optical reflectors of a blocker. CONSTITUTION:A lamp cover 10 is provided so that the light of a lamp 11 is not irradiated directly to a platen 7 of the upper face of a housing A. A blocker 13 provided with plural optical reflectors 15 at intervals in the upper and lower directions is provided vertically between a lens 9 and the lamp 11, and the light of the lamp 11 is reflected by the optical reflector toward the platen 7. Accordingly, it is prevented that the light of the lamp 11 is made incident directly to the platen 7, and also the light of the lamp 11 is irradiated effectively to the platen 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illumination device in a full-surface light type exposure device used in a copying machine.

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

However, with this device, part of the lamp light is blocked by the flat blocker, reducing the amount of light irradiated to the platen, making it impossible to use the lamp light effectively, resulting in poor lighting efficiency. It has a defect.

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 effectively irradiating the platen with lamp light. An object of the present invention is to provide an illumination device for a full-surface exposure device of a machine.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view, and the housing A has a cylindrical shape with an upper opening formed by a bottom wall 1 and left, right, front and rear side walls 2, 3, 4, and 5, and a platen 7 is installed in the upper opening 6. It is set up and sealed.

A mounting hole 8 is formed approximately in the center of the bottom wall 1, and a lens 9 is mounted in the mounting hole 8, and a lamp cover 101, a lamp 11, and a reflector 12 are mounted on the left side wall 2 at intervals in the vertical direction. The light from the lamp 11 is prevented from being directly irradiated onto the platen 7 by the lamp cover 1°, so that the light does not directly enter the operator's eyes.

A blocker 13 is provided between the lens 9 and the lamp 11 on the bottom wall 1, and the blocker 13 has horizontal plates 15 that serve as light reflecting plates on both sides 14a of the vertical mounting member (stand) 14. A plurality of bent pieces 15a of the horizontal plate I5 are attached with bolts 16 on both sides 14 of the vertical plate 14.
The fastening is fixed to a14a, and the mounting angle can be changed, and the surface of the horizontal plate 150 is coated with a highly reflective material.

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

As shown in FIG. 3, a portion of the light from the lamp 11 is irradiated onto each horizontal plate 15 and reflected toward the platen 7, so that the light does not directly hit the lens 9, and the light from the blocker Since the light is irradiated toward the platen 7 without being blocked by the lamp 13, 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.

Moreover, if the reflection efficiency is improved by using the horizontal plate 15 as a mirror,
The light from the rung 11 can be directly sent to areas that cannot be covered by the reflector 12.

As described above, the present invention can prevent the light from the lamp 11 from directly hitting the lens 9, and can also reflect a part of the light from the lamp 11 toward the platen 7 without blocking it with the blocker 13. , the light from the lamp 11 can be effectively used for illuminating the platen, and the illumination efficiency can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway perspective view, FIG. 2 is a perspective view of a blocker, and FIG. 3 is an explanatory diagram of the operation. A is a housing, 7 is a platen, 9 is a lens, 10 is a lamp cover, 11 is a lamp, 13 is a blocker, and 115 is a light reflecting plate. Applicant Fuji Xerox Co., Ltd. Agent Patent attorney Masaaki Yonehara Patent attorney Tadashi Hamamoto 3rd

Claims (1)

[Claims] A lamp cover 10 and a lamp 11 are provided on the sides of the sealed housing A, which has a platen 7 at the top and a lens 9 at the bottom, so that the light from the lamp 11 is not directly irradiated onto the platen 7. A blocker 13 having a plurality of light reflecting plates 15 spaced apart in the vertical direction is provided between the lens 9 and the lamp 11 in the lamp 11.
An illumination device in a full-surface exposure device of a copying machine, characterized in that the light is reflected by a light reflecting plate 15 toward a platen 7.