JPH0338592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illumination device for a copying machine or the like that uses a long incandescent lamp such as a linear halogen lamp, and particularly relates to an illumination device for scanning.

2. Description of the Related Art A lighting device such as a copying machine using a conventional linear halogen lamp has a structure in which both ends of a lamp 1, such as a linear halogen lamp, are held by sockets 2, etc., as shown in FIG. With such a holding means, when an impact force is applied to the lamp 1, as shown in FIG. This tendency was remarkable when scanning. For this reason, with conventional holding means, when the lamp scanning speed is increased, lamp breakage occurs frequently.
Some of them only lasted about ten hours.

In order to prevent this, lighting methods such as the beam scanning type illumination device shown in Japanese Patent Publication No. 53-41971 and the full exposure method, which do not allow vibrations and shocks to be captured in the lamp, have appeared, but both of these methods do not However, it has the drawbacks of being large and expensive.

The present invention has been made in view of the above-mentioned problems, and is a copying machine that uses a long incandescent lamp such as a linear halogen lamp to improve the vibration resistance and shock resistance of the lamp, thereby extending the life of the lamp. The aim is to provide a lighting device for

That is, as shown in FIG. 3, the present invention prevents vibration of the lamp 1 in the scanning direction by holding one or more parts of the glass tube portion of the lamp 1 with a holder 3 fixed to a frame 4. There is. The holder 3 is configured to grip the entire circumference of the glass tube, but in particular, the present invention is characterized in that the holder 3 grips the glass tube only at a portion corresponding to the non-light emitting area of the filament within the glass tube. It is said that

FIG. 6 shows a specific embodiment of the present invention, in which holders 3a, 3a are used to prevent vibration of the lamp 1 in the scanning direction indicated by the arrow.

FIG. 7 shows another embodiment. The holder 3b has a mirror-like structure, and by appropriately positioning and angles of the holder 3b, the illuminance distribution of the illumination device can be adjusted.

In the embodiment shown in FIG. 8, the lamp 1 is supported by a wire 3c, and according to this embodiment, the light distribution characteristics of the lamp 1 can be maintained.

The embodiment shown in FIG. 9 shows an example in which the positional relationship between the filament of the lamp 1 and the holder 3d can be changed, and this also makes it possible to adjust the illuminance distribution.

On the other hand, FIG. 4 shows the allowable velocity G that the lamp 1 receives at positions a, b, and c shown in FIG. 2, where A shows the acceleration of the conventional lamp and B shows the acceleration of the lamp in the present invention. .

FIG. 5 shows the life of the lamp 1, where C shows the conventional lamp and D shows the lamp of the present invention.

The present invention is as described above, and in an illumination device such as a copying machine in which a long incandescent lamp such as a linear halogen lamp is used as the lamp 1 and the lamp 1 is movable, the glass tube portion of the lamp 1 is Holders 3, 3a, 3b, 3 that grip the entire circumference of this glass tube
By holding at points c and 3d, the above lamp 1
The vibration resistance and impact resistance of the lamp 1 are improved, and the life of the lamp 1 can be extended. In particular, since the glass tube portion of the lamp 1 is held by the holders 3, 3a, 3b, 3c, and 3d that grip the entire circumference of the glass tube, the lamp 1 is firmly held, and copying is possible. This structure can sufficiently withstand an increase in the moving speed of the lamp 1 in a machine or the like.

Moreover, in the present invention, since the glass tube part is fixedly held on the reflector by the holder in the non-light emitting area of the filament, it has the effect of minimizing the illumination reduction of the filament due to the presence of the holder. Due to the presence of the reflector,
Since the non-light emitting area of the filament is compensated for by the reflected light from the illumination of the holder, there is no risk of local underexposure during use.

In addition, since the incandescent light is fixedly held relative to the reflector, the incandescent light always maintains the optimal positional relationship designed in advance with respect to the reflector, which has the effect of preventing fluctuations in the light intensity distribution on the platen. have

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional holding means for a linear halogen lamp, FIG. 2 is an explanatory diagram showing the vibration state of the lamp when an impact is applied to the conventional holding means, and FIG. 3 is a holding means of the present invention. 4 is a diagram showing the acceleration acting on the lamp in conventional and inventive means, FIG. 5 is a diagram showing the life of the lamp, and FIGS. 6 to 9 are diagrams showing specific examples of the present invention. It is a perspective view showing an example. 1 is a lamp, 3 is a holder.

Claims (1)

[Scope of Claims] 1. Comprised of an incandescent electric lamp having a filament inside, a reflector for reflecting the light emitted from the incandescent electric lamp, and a socket for holding both ends of the incandescent electric lamp, and a copying machine, etc. In an illumination device that moves at high speed inside the filament, the filament is a long filament in which light-emitting areas and non-light-emitting areas are alternately continuous, and the filament is held at the outer periphery of the non-light-emitting area by a holder that grips the entire circumference of the filament. 1. A lighting device for a copying machine, etc., characterized in that an incandescent electric light is fixedly held on a reflector.