JPH0317295Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an illumination device for a facsimile machine, a copying machine, a photographic device, etc.

An example of a conventional lighting device of this type is shown in FIG.

Reference numeral 1 is a document to be imaged, 2 is an illumination light source, 3 is a first reflector, 5 is a lens, 6 is an imaging device, 8 is a transparent document support plate, and 9 is a reading surface.

In such conventional devices, the optical system is exposed, so harmful dust entering from the outside etc.
Transparent document support plate, front of lens, lamp,
Since it adheres to the surface of the reflector, it has disadvantages such as deterioration of the image quality obtained from the imaging device and reduction of illumination efficiency.

The present invention eliminates and improves the conventional drawbacks as described above, and provides a dust-proof illumination device that illuminates an imaged document while achieving higher dust-proof performance.

The purpose is to improve dust resistance, improve productivity and lighting efficiency, and facilitate handling and maintenance.

FIG. 2 shows a first embodiment of the present invention, and the same reference numerals as in FIG. 1 represent the same or equivalent functions.

As can be seen from the figure, the imaged original 1 on the transparent original support plate 8 and the reading surface 9 are illuminated by direct light from the illumination light source 2 and indirect light from the first reflector 3.

In the present invention, the dustproof cover 4A includes an illumination light source 2.
A transparent material or a combination of a transparent material and an opaque material through which the light from the first reflector 3 can pass is used to illuminate the reading surface 9 from outside the dustproof cover 4A. Since the illumination light source 2 is installed outside the dustproof cover 4A, heat does not accumulate inside the dustproof cover 4A, and the light source 2 is easy to replace, and when replacing the light source 2, dust does not enter the dustproof cover 4A. There's nothing to do.

FIG. 3 shows a second embodiment of the present invention, and the same reference numerals as in FIGS. 1-2 represent the same or equivalent functions.

In FIG. 3, in order to improve the illumination efficiency of the illumination light source 2, a dustproof cover 4B, which is a combination of a reflector and a dustproof cover, is installed. Also in this embodiment, since the illumination light source 2 is installed outside the dustproof cover 4B, dust will not enter the dustproof cover 4A when the light source 2 is replaced. Further, since there is a gap between the reflector 3 and the dustproof cover 4B, heat is not trapped. By using a movable reflector 3, the light source 2
becomes easier to replace.

As is clear from the above description, according to the present invention, the following effects are achieved.

(1) Prevents harmful dust from entering the lens, document support plate, lamp, reflector, etc.

(2) The infiltration of dust can be prevented regardless of the replacement of lighting sources, etc.

(3) Heat dissipation from the lamp is easy.

(4) By integrating the dustproof cover and reflector, lighting efficiency can be improved without reducing the dustproof effect.

(5) By selecting an appropriate material for the reflector integrated with the dustproof cover, the mechanical strength of the dustproof cover can be increased, a special structure is no longer required, and productivity can be improved.

(6) Regardless of the size of the lamp, the dustproof cover can be made as small as possible, eliminating waste of materials and improving productivity.

(7) By minimizing the transparent part of the dustproof cover and using a reflector to cover the transparent part, loss of illumination light can be reduced and illumination efficiency can be improved.

(8) The lamp is located outside the dustproof cover, making maintenance such as lamp replacement easier.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventionally known illumination device, FIG. 2 is a schematic diagram of a first embodiment of the present invention, and FIG. 3 is a schematic diagram of a second embodiment of the present invention, which improves illumination efficiency. DESCRIPTION OF SYMBOLS 1... Document to be imaged, 2... Illumination light source, 3... First reflector, 4A, 4B... Dust-proof cover, 5... Lens, 6... Imaging device, 7... Second reflector, 8...
...Transparent document support plate, 9...Reading surface.

Claims (1)

[Scope of utility model registration request] A space between a document to be imaged and an imaging device that images the document is covered with a transparent document support plate and a light-transmissive dustproof cover, and a light source for illuminating the document is provided outside the dustproof cover. dust-proof lighting equipment.