JPH02197868A - Lighting device - Google Patents

Abstract

PURPOSE:To reduce the vibration of a stick-shaped lamp and to perform projection of a distinct image by supporting both edges of the stick-shaped lamp by means of a supporting frame, and supporting the intermediation of the stick- shaped lamp by means of the engaging arm of an intermediate supporting member combined with the supporting frame. CONSTITUTION:This exposing device has the supporting frame 2 which is engaged with the both edges of the stick-shaped lamp 1 so as to support it, and the intermediate supporting member 4 which has the engaging arm 4a supporting the intermediation of the supporting frame 2 and the stick-shaped lamp 1. In this way, the stick-shaped lamp 1 is supported by the supporting frame 2 and the intermediate supporting member 4. As a result, vibration is reduced, and light amount seldom decreases. Therefore, the device is satisfactorily used as the exposing device for a mobile optical copying machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an illumination device using a rod-shaped lamp, and particularly to an illumination device suitably used as an exposure device of a copying machine or the like.

[Conventional technology]

2. Description of the Related Art Illumination devices using rod-shaped halogen lamps or fluorescent lamps are used in exposure devices such as copying machines. In such conventional lighting devices, the electrode connection portions provided on the support frame engage with both ends of the rod-shaped lamp to support the rod-shaped lamp, but do not support the rod-shaped lamp in the middle. As a result, the rod-shaped lamp tends to vibrate, putting a heavy burden on the electrodes at both ends.
Not only does the filament vibrate, which shortens the life of the bar-shaped lamp, but it also has the problem of not being able to project clear images as an exposure device for originals. These problems are noticeable when using a halogen lamp with a filament stretched across its entire length through the center as a rod-shaped lamp, and in particular, the problem of not being able to project a clear image is This problem becomes more noticeable when a reflective surface for condensing light is provided on the outer periphery of the straight tube of the halogen lamp. This is because the relative position of the reflective surface and the filament changes due to the vibration of the rod-shaped lamp, and the change becomes larger as it moves from both end supports toward the center, thereby changing the state of light projected onto the document.

[Problem to be solved by the invention]

The present invention has been made to solve the above-mentioned problems, and it extends the life of the bar lamp, stabilizes the illumination condition, and projects clear images when used as an exposure device of a copying machine. The purpose is to provide a lighting device that can.

[Means to solve the problem]

The present invention provides a lighting device in which a support frame having an electrode connection portion engages with both ends of the bar-shaped lamp to support the bar-shaped lamp. The lighting device is characterized in that an intermediate support member having an engaging arm is connected to the support frame, and this configuration achieves the above object.

[Effect]

That is, in the lighting device of the present invention, the support frame supports both ends of the rod-shaped lamp, and the intermediate support member coupled to the support frame also supports the middle of the rod-shaped lamp with its retaining arms, so that the vibration of the rod-shaped lamp is suppressed. As a result, fluctuations in the state of light projected onto the document are also reduced, and when used as an exposure device in a copying machine, the document can be illuminated stably and uniformly, and a clear image can be projected. can.

〔Example〕

The present invention will be explained below using illustrated examples.

FIG. 1 is a perspective view showing an example of the lighting device of the present invention, FIG. 2 is a partial front view showing the positional relationship in which the engaging arm of the intermediate support member is engaged with the rod-shaped lamp, and FIG. 3 is the present invention. 1 is a partial configuration diagram of a copying machine showing an example in which a lighting device is used as an exposure device.

In the figure, l is a rod-shaped lamp having electrodes at both ends, and 2 is a support frame that engages with both ends of the rod-shaped lamp l and supports the rod-shaped lamp l with the electrode connection part connected to the electrodes at both ends of the rod-shaped lamp l. , 3 is a reflective shade integrally combined with the support frame l, and 4 is an intermediate support member having an engaging arm 4a that engages with the outer diameter of the straight pipe portion of the rod-shaped lamp l to support the middle of the rod-shaped lamp l. The intermediate support member 4 shown in FIG. 1 is attached to the reflective shade 3 with screws 5, thereby indirectly connecting it to the support frame l. The engaging arm 4a of the intermediate support member 4 has a filament stretched at the center over the entire length of the rod-shaped lamp l as shown in FIG. When using a halogen lamp consisting of a linear connecting portion 1a and a coiled light emitting device 1151b, engaging the outer diameter of the connecting portion 1als of the rod-shaped lamp l is achieved by the engagement arm 4a of the rod-shaped lamp l. This is preferable because the amount of light is less likely to be reduced.

The above-mentioned illumination device has a movable optical system as shown in FIG. It is suitably used as an exposure device for a copying machine. In the illumination device shown in FIG. 3, the reflective shade 3 is provided with a slit 3a through which light reflected from the document surface passes. In addition, in FIG. 3, 6 is a platen glass on which the original is placed, and 7 is a first platen glass that scans in the direction of the arrow together with the illumination device.
The mirror 8 moves at 1/1 of the moving speed of the illumination device and the first mirror 7.
V-mirror 9 moves in the direction of the arrow at a speed of 2. Reference numeral 9 designates an imaging lens, and reference numeral 10 designates a third mirror that projects light onto the photosensitive drum 11 rotating in the direction of the arrow.

The illumination device of the present invention provides particularly remarkable effects when used as an exposure device for a copying machine as described above, but is not limited thereto, and may be used for other illumination. Further, there may be no reflective shade, and the intermediate support member may be directly connected to the support frame, or the rod-shaped lamp may be a fluorescent lamp other than a halogen lamp.

〔Effect of the invention〕

The lighting device of the present invention has a long life due to less vibration of the rod-shaped lamp, and when used as an exposure device of a copying machine, it can stably and uniformly illuminate a document and project a clear image. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the lighting device of the present invention, FIG. 2 is a partial front view showing the positional relationship in which the engaging arm of the intermediate support member engages with the rod-shaped lamp, and FIG. 3 is the present invention. 1 is a partial configuration diagram of a copying machine showing an example in which a lighting device is used as an exposure device. ■... Rod-shaped lamp la... Filament connecting part lb... Filament light emitting part 2... Support frame 3 a... Slit 4a... Holding arm 6... Platen glass 8... ...V mirror lO...Third mirror 3...Reflector 4...Intermediate support member 5...Brew 7...First mirror 9...Imaging lens 11...Photoconductor drum

Claims (1)

[Claims] In a lighting device in which a support frame having an electrode connection portion engages with both ends of the bar-shaped lamp to support the bar-shaped lamp, an engaging arm engages with an outer diameter of a straight tube part of the bar-shaped lamp to support an intermediate portion of the bar-shaped lamp. A lighting device characterized in that an intermediate support member having: is coupled to the support frame.