JPS5817462A - Original illuminating device of image forming apparatus - Google Patents

Abstract

PURPOSE:To easily install an illuminating light source to an exact position, irrespective of a setting person, by constituting a guide supporting means of a heat-resistant and non-heat-conducting member for supporting a light source member. CONSTITUTION:End plate members 8, 9 being a guide supporting member, for supporting a shade-like reflecting means 2 are constituted of a heat-resistant non-heat-conducting member (for intance, unsaturated polyester resin, natural or synthetic mica moldings, ceramicsm etc.), and are fixed to a base of an original illuminating device by fitting plates 10, 11. To the end plate members 8, 9, the shade-like reflecting means 2 is installed by utilizing openings 8a, 8b, 9a and 9b. In this way, when the guide supporting means is constituted of the heat resistant non-heat-conducting member, a position in case of installing an illuminating lamp 1 in the reflecting means 2 can be reproduced easily and exactly. Also, since the illuminating lamp 1 is directly supported by the guide supporting means, it is effectively used for an electrophotographic copying device in which the original illuminating device moves, especially, for that which moves at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document illumination device used in an image forming device such as an electrophotographic copying device or a recording device. More specifically, the present invention relates to a document illumination device that can support a highly accurate position of a light source for illumination, such as a lamp.

Hereinafter, an explanation will be given using an electrophotographic copying apparatus as an example.

Generally, in an electrophotographic copying device, a shade-shaped device is used for a document illumination device placed between a document table on which a document to be copied is placed and a photoreceptor serving as an image carrier on which a document image is projected by an imaging optical system. The reflecting means is disposed inside the reflecting means and reflects the emitted light from the nine long lamps and focuses it on an area of a predetermined width of the original to be copied. For this purpose, one reflecting means is continuously formed with one or more quadratic curves, and is open only in the direction in which the light from the lamp is guided to the original to be copied.

Here, although an accurate shape can be made by press molding or extrusion molding of a plate-like member, the illumination lamp placed inside must be supported in the correct position.

The correct performance of this document illumination device is not exhibited.

Next, a conventional example will be explained with reference to FIGS. 1 and 2.

In the figure, 2 is an IFi illumination lamp (for example, a halogen lamp, etc.), 2 is a shade-shaped reflecting means, and 211 and 2b are holes 3g, 3b, 4a, and 4b in end plate members 3 and 4, and screws (not shown), respectively. These are the holes that will be joined.

The end plate members 3 and 4 are fixed to a base (not shown) of a document illumination device. Further, 5 and 6 are connection members that are connected to the base portions 18 and 1b of the illumination lamp 10 and contribute to energization, and are fixed to the base via an electrically insulating member (not shown).

When assembling the device or replacing the lighting lamp, insert the lighting lamp 1 inside the shade-shaped reflecting means 2, determine its position as a guide, adjust the connecting members 5 and 6 at both ends, and then
support. Alternatively, as shown in FIG. 2, a method is used in which the dimensions of the illumination lamp 10 are set from the reference position of the shade reflecting means 2 using a scale 7 or the like, but neither method is perfect, and However, there was a problem with individual differences among the installers.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems and provide a document illumination device that can be easily installed in an accurate position when removing and sealing an illumination light source regardless of the installer. purpose.

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

Components having the same functions as in FIG. 1 are numbered the same.

In FIG. 3, reference numerals 8 and 9 are end plate members, which differ from the conventional end plate members 3 and 4 in that they are heat-resistant heat conductive members (such as unsaturated polyester resin, natural or synthetic mica). molded parts, ceramics, etc.), and the mounting plate 10.
At 11, a base (not shown) K of the document illumination device is fixed.

Openings 88, 8b, 9a provided in the end plate members 8, 9
・9b is an opening for screws or the like to attach the shade-shaped reflecting means 2.

At this time, connect the holes 8C and 9C of the end plate members 8 and 9 with the illumination lamp 1.
The diameter of the reflector is selected to be approximately equal to the diameter of the reflector, and its position is set at the exact position where the illumination lamp 1 is located inside the shade-shaped reflecting means 2. Therefore, when scattering the illumination lamp 1, the guide opening 8
By inserting the lamp into the lamp 9c, it is possible to reproduce the illumination lamp l in the correct position at any time.

In addition, as shown in FIG. 4, the guide opening 13 of the end plate members 8 and 9 on the guide side of the illumination lamp 1 leaves at least half the diameter of the illumination lamp 1, and the rest is open. 7. Since the illumination lamp 1 is supported by the connecting members at both ends, the guide opening 13 only needs to serve as a guide for positioning when attaching *b. This is better when the base of the illumination lamp 1 is thick.

Furthermore, as shown in FIGS. 5(a) and 5(b)K, the end plate members 3 and 4 have a large opening through which the illumination lamp 1 passes, even if the end plate members 3 and 4 do not use heat-resistant heat conductive members. Furthermore, the same effect can be obtained by fitting stake-like members 12 made of a heat-resistant heat conductive material into the cap-like reflecting means 2 and arranging at least two of them at both ends of the cap-like reflecting means 2. Can be done.

can be prevented from rotating around the illumination lamp 1 and shifting.

In the above embodiment, only an example of a shade-shaped reflecting means is shown, but the present invention is not limited to this.

As explained above, the present invention has the advantage that the guide support means is constructed of a heat-resistant heat conduction member, and the position of the illumination rung in the reflection means of the document illumination device can be easily reproduced. It will definitely be done. In addition, since the guide support means directly supports, for example, an illumination lamp as a light source means, it is possible to use an electrophotographic copying apparatus in which a document illumination device moves, especially when
If the present invention is used in a vehicle that moves at high speed, it is also effective as a means for supporting illumination lamps, for example.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional device, FIG. 2 is a sectional view of the same conventional device, FIG. 3 is a perspective view of a document illumination device using an additional embodiment of the present invention, and FIG. 4 is another embodiment. Side view of the example, Figure 5 (a
) and FIG. 5(b) are sectional views of still another embodiment. In the figure, 1-...Illumination 2 lamp 2...Shade-like reflecting means 5, 6... Connection member 8, 9...
-・End plate members 10, 11...Mounting plate 12
・・・・・・Pile-shaped member 13・・・・Guide opening Application person Canon Co., Ltd.

Claims (3)

[Claims] (1) A document illumination device of an image forming device that illuminates a document on a document table and projects a reflected document image onto a support member, which includes an illumination light source member and a reflecting means for reflecting light from the light source member. 1. A document illumination device for an image forming apparatus, comprising: a guide support means made of a heat-resistant heat conduction member that supports the light source member; (2) The document illumination device for an image forming apparatus according to claim (1), wherein the guide support means is an end plate member that supports both ends of the reflection means. (3) The document illumination device for the ii* forming apparatus according to claim (1), wherein the guide support means is arranged in the form of at least two side pillows inside the reflection means.