JPH0644046Y2 - Original illumination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a document illuminating device used to illuminate a document in a band shape in a copying machine such as an electrophotographic copying machine, a facsimile, and an OCR (character reading device). It is about.

[Background of technology]

For example, an original illuminating device used in an electrophotographic copying machine is configured by using a tube type light bulb as an original illuminating lamp, and arranging a gutter-shaped reflecting mirror so as to surround the tube type light bulb. By illuminating the elongated illumination area extending in the width direction of the original plate made of transparent glass, an optical image of the original is formed, and the optical image of the original is formed on the photoconductor through the imaging lens.

[Conventional technology]

Conventionally, as a method of arranging and holding the tube type light bulb in this gutter-shaped reflecting mirror, a through hole is opened in the side plates at both ends of the gutter-shaped reflecting mirror, and the tube type light bulb is inserted through this through hole. Position both ends of the bulb outside the side plate, and with the terminal of one end of the tube-shaped light bulb in contact with the contact part of one light bulb holder, elastically connect the contact part of the other bulb holder to the other end terminal. The tube type light bulb is held between both contact portions by pressing it, and power is supplied through this bulb holder to light the tube type light bulb.
Then, in order to facilitate the mounting of the tube-type light bulb, it is known that a conical truncated cylinder-shaped guide member is provided at a contact portion of one of the bulb holders with which a terminal at one end of the tube-type bulb is brought into contact. .

[Problems to be solved by the invention]

However, when the guide member is provided at the contact portion of the light bulb holder, the weight of the tip of the light bulb holder becomes large, and moreover, when the tube-shaped light bulb is replaced, it is easy to receive a shock, so the light bulb holder is easily displaced, Therefore, there is a problem in that the contact portion at the tip is easily displaced. When the contact portion is displaced, the position of the tubular bulb with respect to the reflecting mirror changes, so that good document illumination cannot be achieved.

[Purpose of device]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a manuscript illumination device that can quickly replace a tube-type light bulb with a simple structure and that does not shift its position. To do.

[Means for solving problems]

The document illuminating device of the present invention includes a gutter-shaped reflecting mirror, side plates for holding both ends of the reflecting mirror, and a reflecting mirror that is inserted into through holes formed in the side plate so that both ends of the reflecting mirror project outward from the side plate. Fixed to the side plate, which has a tubular light bulb disposed inside thereof and having power supply terminals at both ends thereof, and a contact portion which elastically presses and holds the tubular light bulb in the lengthwise direction at the power supply terminals at both ends thereof. In a document illuminating device including a light bulb holder provided as a single unit, a tapered truncated cone-shaped light bulb insertion guide member is integrally provided on one of the side plates, and the guide member is provided at the center of the opening at the outer end of the guide member. It is characterized in that the contact portion of the light bulb holder is located at the facing position.

[Action]

According to such a configuration, when replacing the tubular light bulb,
Insert one end of a tube-type light bulb from the through hole of the other side plate without the guide member toward the through hole of one side plate, and insert the tapered truncated cone-shaped light bulb in one side plate. One end of the tubular light bulb is guided and positioned by the guide member. Here, since the contact portion of the light bulb holder is located at a position facing the center of the opening at the outer end of the guide member, the power supply terminal at one end of the tubular light bulb is reliably brought into contact with the contact portion of the light bulb holder. The Rukoto. Moreover, since the guide member is provided integrally with one side plate and is not provided at the contact portion of the light bulb holder, the impact received by the guide member is not transmitted to the light bulb holder. . For this reason,
Even if the guide member receives an impact when replacing the tubular light bulb, the light bulb holder is not displaced, and the above-mentioned problem due to the displacement of the light bulb holder can be solved. Therefore, it is possible to easily and promptly replace the tubular light bulb, and it is possible to always hold the tubular light bulb in a state of being fixed at an appropriate position in relation to the reflecting mirror.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1, FIG. 2 and FIG. 3 are explanatory views showing an embodiment of a document illuminating device when it is used in an electrophotographic copying machine. In the figure, 11 is a tube-type light bulb for illuminating a document, 12 is a reflecting mirror, and 13A and 13B are a first side plate and a second side plate which hold the reflecting mirror 12 at both ends thereof, respectively, and a second side plate 13B. In order to communicate with the through hole 15, a tapered truncated cone cylindrical light bulb insertion guide member 14 is integrally attached.

The tube-type light bulb 11 is located below the platen 16 so that the platen 16
Is positioned at the bottom of the reflecting mirror 12 so as to extend in the width direction (the direction perpendicular to the plane of the paper in FIG. 1), and both ends thereof are respectively located at the first position.
The side plate 13A and the second side plate 13B are projected outward.

The reflecting mirror 12 is made of aluminum or an aluminum alloy, and has a gutter shape as a whole extending along the tubular bulb 11.

The guide member 14 is preferably integrally formed with the other side plate 13B from a heat resistant resin, for example, polyphenylene sulfide (PPS) by an injection molding method.

The base end portion 25A of the first light bulb holder 25 is fixed to the first side plate 13A via the fixing base 23, and the contact portion 25B at the tip end is located at a position facing the opening of the through hole 24 in the first side plate 13A. Is provided,
The base end portion 22A of the second light bulb holder 22 is fixed to the second side plate 13B via the fixing base 21, and the contact portion 22B at the tip is provided at a position facing the center of the outer end opening of the guide member 14. .

Reference numeral 26 is a glass filter that allows light from the tube type light bulb to pass therethrough, and is slid into vertical grooves 27, 27 provided in the upper portions of the first side plate 13A and the second side plate 13B and a horizontal groove 28 formed in the reflecting mirror 12. Both ends of the locking member 29 and screws.
Held through 30.

According to the above configuration, when replacing the tubular light bulb 11, the tubular light bulb 11 can be mounted as follows. That is, one end of the tubular light bulb 11 is connected to the through hole 24 of the first side plate 13A.
From the through hole 15 of the second side plate 13B by moving it along the bottom of the reflecting mirror 12 so that one end of this tubular light bulb 11 communicates with the through hole 15. It is guided by the guide member 14 provided on the side plate 13B, and as a result, the power supply terminal at one end of the tubular light bulb 11 is surely fixed to the second light bulb holder.
The contact portion 22B of 22 is abutted. Therefore, in this state, the contact portion 25B at the tip of the first light bulb holder 25 is locked to the power supply terminal at the other end of the tube light bulb 11 to hold the tube light bulb 11.

In this way, the guide member 14 is integrally provided on one side plate (the second side plate 13B in the illustrated example), and the one side plate has a contact portion related to the power supply terminal at one end of the tubular light bulb 11. Since the second light bulb holder 22 having 22B is fixed, the power supply terminal and the contact portion 22 are connected via the one side plate.
Since the positional relationship of B is properly fixed, both are securely locked and the number of assembled parts is reduced. Further, since the shape of the guide member 14 is a tapered truncated cone shape, the inner surface of the guide member 14 serves as a tapered guide surface, which facilitates the replacement work of the tubular light bulb.

Further, in the present invention, unlike the conventional light bulb holder, since the contact portion does not have a heavy weight, the position of the contact portion does not change.

Since the guide member 14 is provided integrally with the second side plate 13B and is not provided at the contact portion 22B of the light bulb holder 22, when the tube-shaped light bulb 11 is replaced, the guide member 14 is not provided. Even if a shock is received, the shock does not cause the bulb holder 22 to be displaced. Therefore, the contact part
22B is not displaced.

Therefore, since the position of the tube type light bulb with respect to the reflecting mirror does not change, good document illumination can be achieved.

The present invention has been described above based on an embodiment, but the present invention is not limited to the above embodiment, and various changes can be made.

[Effect of device]

As described above, according to the document illuminating device of the present invention, the gutter-shaped reflecting mirror, the side plates holding both ends of the reflecting mirror, and the through holes provided in the side plate are inserted so that both ends are outside the side plate. And a tube-shaped light bulb, which is arranged in the reflecting mirror so as to project toward one side, and which has power supply terminals at both ends thereof, and a contact portion which elastically presses and holds the tube-shaped light bulb in the lengthwise direction at the power supply terminals at both ends thereof. In the original illuminating device comprising a light bulb holder fixedly provided on the side plate, one of the side plates is integrally provided with a tapered truncated cone-shaped light bulb insertion guide member. Since the contact portion of the light bulb holder is located at a position facing the center of the opening at the outer end, the power supply terminal at one end of the tube-shaped light bulb is reliably brought into contact with the contact portion of the light bulb holder. Before replacing the tube light bulb Also as a guide member receives an impact, never bulb holder is displaced, not the position of the contact portion is varied. Therefore, it is possible to easily and quickly replace the tubular light bulb with a simple structure, and it is possible to always hold the tubular light bulb in a fixed position in relation to the reflecting mirror.

[Brief description of drawings]

1 and 2 are an explanatory side view showing an embodiment of the original illuminating device of the present invention and an explanatory plan view showing a tube type light bulb omitted, and FIG. 3 is an X-X line of FIG. FIG. 4 is a sectional view for explanation along the line. 11 …… Tube type bulb, 12 …… Reflecting mirror 13A …… First side plate, 13B …… Second side plate 14 …… Guide member, 15 …… Through hole 22 …… First bulb holder 25 …… First 2 light bulb holders 22A, 22B ...... Contact parts

Claims (1)

[Scope of utility model registration request] 1. A trough-shaped reflecting mirror, side plates for holding both ends of the reflecting mirror, and through-holes formed in the side plate, the both ends of which are arranged in the reflecting mirror so as to project outward from the side plate. Fixed to the side plate, which has a tube type light bulb having power supply terminals at both ends thereof and a contact portion which elastically presses and holds the tube type light bulb in the power supply terminals at both ends thereof. In a document illuminating device including a light bulb holder, a tapered truncated cone-shaped light bulb insertion guide member is integrally provided on one of the side plates, and is located at a position facing the center of the opening at the outer end of the guide member. A document illuminating device characterized in that a contact portion of a light bulb holder is positioned.