JPS62265638A - Supporting device for illumination lamp - Google Patents

Abstract

PURPOSE:To prevent a lamp from being rotated due to vibration during transportation or careless touch of hands after fine adjustment by providing a member for supporting one end of the lamp with a rotation preventing member. CONSTITUTION:The sealing part 17 of the lamp 11 is supported by the forked part 22 of the rotation preventing member 21 formed integrally with a supporting lever 19 and the recessed part 15 of the lamp 11 is engaged with the electrode 18 of the lever 19 to supply current. To execute fine adjustment, the lamp 11 is supported by a hand and strongly rotated around the shaft. Thereby, the lamp 11 is not rotated even by vibration during transportation after fine adjustment or the careless touch of hands.

Description

TECHNICAL FIELD The present invention relates to a support device for a rod-shaped lamp for slit exposure illumination of an electrophotographic copying machine.゛As a light source for slit exposure illumination in conventional electrophotographic copying machines, a bar-shaped lamp is generally used, and as shown in FIG.
A method is adopted in which the light rays emitted from the rung are effectively focused within the slit irradiation width 5 of the document 4 on the contact glass 3. Note that the reference numeral 6 is a rod lens array forming an exposure optical system.

Surin) N? A tungsten lamp 11, which is a common rod-shaped lamp for r-light, has an electrode 16 having a recessed part 15 in the center at both ends of a cylindrical glass tube 14 through a sealing part 17, as shown in FIG. A light emitting filament 12 is stretched between the electrodes 16.

The filament is supported by a glass tube 14 by supports 13 provided at appropriate intervals.

As illustrated in FIG. 6, a lamp support device having this structure is such that the lamp 11 is attached to the tip of a support lever 19 made of a leaf spring that is attached to both ends of a mounting base (not shown) via an insulating body 20. A recessed portion 15 provided at the center of the electrode 16 at both ends of the
A generally conical metal protrusion 18 that can be held in place is attached to the lamp electrode 1 from both sides by means of an elastic support lever 190.
The terminal block is used to resiliently engage the recessed portion 15 of 6 to hold the lamp in a predetermined position, and to supply electricity to the lamp as the protrusion 18t-electrode. The elastic force for securing the protrusion 18 into the recess on the lamp side is generated by the spring force of the support lever itself.Also, there is also a lever which is pressed against the end of the lamp by a spring provided separately. be.

In the lamp of the above structure, the filament 12 and electrode 16 are located at the center of the rod, and if the position of the electrode 18 on the support device side is determined when installing the lamp, the position of the filament will not shift significantly even when the lamp is replaced. The shape is simple and can be made small, which is convenient. However, as can be seen from the structure, installation errors occur at the joints of each component, and there are also variations in the shape of the parts.
When supported in the reflector 2 shown in the figure, it is difficult to completely place the filament in a predetermined position within the reflector over its entire width (in the example shown, the focal point of the ellipse), so it is necessary to make fine adjustments for each lamp. . This fine adjustment is performed by rotating the lamp, and the installation of the entire terminal block is performed by finely adjusting the position. Also, a device is used in which a fine adjustment device is provided on the terminal block itself so that fine adjustment can be made after the lamp is installed. The amount of light in a copying machine can be adjusted not only by changing the lamp mounting position and rotating the lamp, but also by providing a light-shielding plate elsewhere in the illumination device, or by changing the mounting position and shape of the reflecting mirror.

On the other hand, supporting the finely adjusted lamp by the electrodes of the support device and rotating it around the center line also causes non-uniform illumination. However, in addition to turning the lamp intentionally, the lamp may also rotate due to vibration during transportation from assembly to unpacking.

As a means to prevent the lamp from rotating, for example, a part of the circumferential surface of the electrode at the end of the lamp is made flat, and when the lamp is installed adjacent to the electrode of the support plate on the support device side, the above-mentioned method is used. A configuration has been proposed in which a flat plate that can make surface contact with a flat surface is attached, but this configuration has the disadvantage that it is not possible to turn the lamp for fine adjustment. The part shape becomes complicated.

The disadvantage is that the cost increases.

Purpose: In view of the above-mentioned drawbacks of the conventional document illumination lamp support device of a copying machine, the present invention provides a lamp assembly in which the lamp is sometimes finely adjusted by rotating the lamp around its axis while being supported on the electrodes of the support device. An object of the present invention is to provide a support device for a document illumination lamp of an electrophotographic copying machine, which allows the lamp to rotate during transportation after fine adjustment, and which prevents the lamp from rotating due to shock, vibration, or inadvertent touching of the rung. do.

Structure: In order to achieve the above object, the lamp support device according to the present invention is characterized in that a rotation preventing member is integrally provided with the support device and is capable of gripping at least one end of the illumination lamp to prevent it from rotating. do.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an embodiment in which the present invention is applied to the terminal block of the lamp support device, which was previously explained in FIG.
A rotation preventing portion 21 is provided at the tip of the bifurcated portion 22tl, which can grip the end of the lamp supported by the protrusion 18 at the tip. The rotation prevention part 21 can be made separately from the support lever 19, as shown in FIG. 2, and can be integrally connected with the support lever 19 by a known method. .

In either embodiment, the end of the glass tube 14 of the lamp 11 or the sealing part 17 is held between the bifurcated part 22 of the rotation prevention part 21 and is protected against external force such as vibration during transportation or involuntary contact with human hands. It is gripped so that it does not rotate.

However, when rotating the lamp around its axis for fine adjustment, the operator can hold the lamp in his hand and turn it strongly. Note that, as shown in FIG. 3, the grip release pin 23
By driving in the forked portion 22 to open the forked portion 22, the lamp 11 is released from the grip and can be easily rotated.

According to the configuration of the present invention, there is no need to change the shape of the lamp at all, and even a conventional lamp can be reliably prevented from rotating. Furthermore, the pressing force of the engaging portion between the electrode of the lamp and the electrode of the support device is hardly affected, and the anti-rotation effect is not affected even by fine adjustment of the position of the terminal block.

Effects As described above, according to the present invention, it is possible to make fine adjustments by rotating the lamp with a simple configuration without causing an increase in cost, while reliably preventing rotation of the lamp during transportation etc. The finely adjusted state can be maintained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a terminal block of a support device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a terminal block of a support device according to another embodiment, and FIG. 3 is a gripping device of still another embodiment. FIG. 4 is a sectional view showing an example of a known illumination device for slit exposure of a copying machine, FIG. 5 is a sectional view showing the configuration of an example of a rod-shaped lamp, and FIG. FIG. 3 is a side view showing the configuration of a terminal block of the lamp support device. 11... Rod-shaped lamp 12... Light emitting filament 14... Glass tube work 5... Recessed part 1
6... Electrode 18... Protrusion (electrode) 1
9...Lever 21...Rotation prevention member 2
2...Grip part (bifurcated part) C 1 Hibiki Figure 3

Claims (1)

[Claims] A supporting device for an illumination lamp for slit exposure of a copying machine, which has an electrode having a concave part at the center at both ends of a rod-shaped lamp, and a light emitting filament is stretched between the two electrodes. A protrusion is provided at the distal end of the projection that engages rotatably around the center line of the lamp to position the lamp and supply power to the lamp, and the distal ends have a pair of levers that are biased in a direction in which the distal ends approach each other. A support device for an illumination lamp in which a protrusion resiliently engages with a recessed portion of an electrode of the illumination lamp; A support device for an illumination lamp, characterized in that a prevention member is provided.