JPS6356644A - Adjusting device for dimming plate of copying machine - Google Patents

Abstract

PURPOSE:To automatically adjust the position of each dimming plate by calculating the operation quantity of each moving mechanism by a controller according to an illuminance distribution measured by an optical sensor and moving the respective dimming plates based on the calculation result. CONSTITUTION:Target illuminance is set in the controller 23 first. Then, a tube-shaped electric bulb 2 is turned on and light reflected by a reflecting mirror body 1 and a standard original 14 is passed through the optical system 15 to illuminate the optical sensor 16. Then a rod 18 is rotated. Then a running body 17 moves in the axial direction of the electric bulb 2, so the sensor 16 scans the illuminance in the axial direction of the electric bulb. The controller 23 compares the illuminance measured by the sensor 16 with the target illuminance. When both illuminance values are different, their difference is calculated. Then the positions of a dimming plate 7b and then dimming plates 7a and 7c are adjusted to approximate the illuminance at each position to the target illuminance, and the positions of all the dimming plates are adjusted completely.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a method for controlling the position of a light control plate divided into a plurality of parts in order to control the amount of light directed toward a copy document in a copying machine. The present invention relates to an adjustment device for adjustment.

(Prior Art) In an electronic copying machine, as shown in FIG. 3, in order to copy a copy original 4 placed on a translucent placement plate 3, a long sheet of paper having a gutter-like shape as a whole is used. )1u! A body 1 and a tube-shaped light bulb 2 such as a halogen bulb placed approximately at the focal point of the reflector body 1, and the light emitted from the tube-shaped bulb 2 is transmitted through the reflector body 1 and The light is focused on a copy original 4 placed on a mounting plate 3, and the light reflected from this copy original 4 is imaged on a photoreceptor drum 6 via an optical system 5 such as a lens, prism, or reflector. It is designed to let you do so.

The tube-shaped light bulb 2, such as a halogen light bulb, used as a light source usually has a long dimension spanning the width of the copy, and is made up of a plurality of filaments in the tube axis direction (not shown) in order to prevent illuminance imbalance on the document surface. Light-emitting parts and non-light-emitting parts are arranged alternately.

However, even if the light-emitting parts and non-light-emitting parts made of multiple filaments are arranged alternately in the tube axis direction, the light intensity of the light-emitting parts is greater than the non-light-emitting parts, so the illuminance distribution in the tube axis direction is as shown in Figure 5. There is a problem with unevenness.

In order to correct the uneven illuminance distribution in the tube axis direction as described above, a light control plate 1 is installed above the reflector body 1, and the light control plate 7 is adjusted by moving in the direction of arrow A or in the opposite direction. According to
A means is employed to increase or decrease the amount of light directed toward the copy document 4 of the light emitted from the tube-shaped light bulb 2 and the light reflected by the reflector 1.

As shown in FIG. 4, the light control plate 7 is divided into a plurality of pieces (five pieces in the figure) in the tube axis direction, and each of the light control plates 7a to 1e thus divided can be independently positioned (adjusted). It is possible to do so.

Each of the light control plates 7a to 7e has a long hole 8 so that the position thereof can be adjusted, and is fixed to the chassis 10 by inserting a screw 9 into the long hole 8. .

(Problems to be Solved by the Invention) By the way, the plurality of light control plates 78 to 78 divided as described above
1e, the light control plate 78
When adjusting the position of ~7e, conventionally, the adjustment was done manually by a worker.

Manual position adjustment is extremely inefficient.

That is, when adjusting the position of this type of light control plate 78 to 7e, when adjusting the position of one light control plate, the illuminance distribution changes not only in the area of this light control plate but also in this light control plate. The area adjacent to the plate is also affected, and therefore the position of other adjacent light control plates also needs to be corrected.

For this reason, there is a problem in that it is extremely time-consuming to perform these tasks manually.

SUMMARY OF THE INVENTION The present invention provides an adjustment device for a light control plate in a copying machine that can automatically perform adjustment work.

[Structure of the Invention (Means for Solving Problems)] The present invention provides a moving mechanism for moving each light control plate, a standard document placed on a translucent mounting plate and having standard brightness, A light sensor is provided at a position corresponding to the photosensitive drum and measures the illuminance distribution of light irradiated through the optical system, and the moving mechanism is operated according to the illuminance distribution measured by the sensor to move each light control plate. The present invention is characterized by comprising a control device for adjusting the position.

(Function) According to the device of the present invention, control is performed according to the illuminance distribution measured by the optical sensor! Since the I device calculates the operating amount of each moving mechanism and issues a command to the moving mechanism based on this calculation to move each light control plate, the position of each light control plate can be automatically adjusted. Work can be done efficiently.

(Embodiment of the Invention) The present invention will be described below based on an embodiment shown in FIGS. 1 and 2.

FIG. 1 schematically shows the configuration of the adjustment device, in which a reflector 1 and a tube-shaped light bulb 2, such as a halogen light bulb, placed approximately at the focal point of the reflector 1 are already assembled into the chassis 10. It is.

Although not shown, a standard document 14 is placed on a translucent placement plate similar to that of the actual device. The irradiated surface of this standard document 14 has a predetermined standard brightness.

An optical system 15 similar to the optical system of the actual machine, such as a lens, a prism, or a reflector, is installed at the same position as the optical system of the actual machine.

In addition, an optical sensor 1 is located at the same position as the photoreceptor drum in the actual machine.
6 is provided. The sensor 16 is, for example, a line sensor, and is attached to the traveling body 17.

The running body 17 is screwed onto a threaded rod 18 by ball screw means, and by rotating the threaded rod 18 with a motor 19, it can be moved along the axial direction of the tube-shaped light bulb 2. Therefore, the optical sensor 16 can scan the light emitted through the optical system 15 along the axial direction of the tube-shaped light bulb 2.

Light control plates 78 to 7c (in this embodiment, three plates are shown) located above the reflector body 1 and attached to the chassis 10
are connected to the moving mechanism 20...

Each moving mechanism 20... is configured to drive an arm 21 to move forward and backward by a pulse motor or step motor (not shown), and a suction cup 2 is attached to the tip of this arm 21.
2 is rotatably supported on a shaft.

Each of the light control plates 7a to 7I is arranged with a moving mechanism 20 facing each end of each light control plate.
The position of C is adjusted by two moving mechanisms 20...

Each moving mechanism 20... is operated by a command signal from the control device 23, and the control device W123 controls the moving mechanism 20 according to the illuminance measured by the optical sensor 16.
. . determines the amount of movement of the arm 21.

The operation of the control device 23 is as shown in the flowchart shown in FIG.

The operation of the adjustment device of this embodiment will be explained with reference to this flowchart.

The chassis 10 in which the reflector body 1 and the tube-shaped light bulb 2 have already been installed is installed at a predetermined position of the adjustment device, and each light control plate 78 is installed.
~7C is chucked by the suction cup 22 of the moving mechanism 20....

Adjustment of the light control plate is started in this state (second
30) in the figure first sets the target illuminance in the control device 23 (31).

Next, the tube-shaped light bulb 2 is turned on, and the light reflected by the reflector body 1 and the standard document 14 is irradiated onto the optical sensor 16 through the optical system 15. and from the control device 23 to the motor 19
A command is issued to rotate the motor 19, and the threaded rod 18 is rotated by the motor 19. Then, since the traveling body 17 moves along the axial direction of the tube-shaped light bulb 2, the optical sensor 16 can scan the illuminance along the axial direction of the tube-shaped light bulb 2.

In this embodiment, first, the illuminance at a location facing the center position in the axial direction is measured (32).

The control device 23 uses the illuminance measured by the optical sensor 1G,
Compare the illuminance with the 9-ring illuminance input above (
33).

In the above comparison, the illuminance measured by the optical sensor 16 and
If the target illuminance entered in advance does not match, the difference is calculated (34).

If the measured illuminance is lower than the target illuminance, the position of the central light control plate 7b is adjusted. That is, the arm 21 of the moving mechanism 20 connected to the light control plate 7b located in the center is moved in the direction of arrow A, thereby moving the light control plate 7b in the same direction (35).

Therefore, the amount of light directly from the tube-shaped light bulb 2 and reflected by the reflector 1 that reaches the standard original 14 is increased, and the illuminance in the central portion can be brought closer to the target illuminance.

On the other hand, if the measured illuminance is higher than the target illuminance, the arm 21 of the moving mechanism 20 connected to the light control plate 1b located in the center is moved in the direction of arrow B, thereby causing the light control plate 1b to move.
b in the same direction (36), so that the tube-shaped light bulb 2
By reducing the amount of light that reaches the standard document 14 directly and reflected by the reflector 1, the illuminance at the center can be brought closer to the target illuminance.

When the position of the light control plate 1b located in the center is adjusted in this way, the position of the light control plate 7b located in the center and the adjacent light control plate is adjusted to 11 points in the same manner as above. death,
Thereafter, the light control plates on the end side are adjusted in sequence (31).

In this way, the position adjustment of all the light control plates is completed (3
8).

According to the above adjustment device, the control device 23 calculates the operation wJm of each moving mechanism 20 according to the illuminance measured by the optical sensor 16, and based on this calculation, the moving mechanism 20 controls each light control plate 7.
Since the light control plates 78 to 7C are moved, the positions of the respective light control plates 78 to 7C can be automatically adjusted. Therefore, adjustment work can be performed efficiently.

Moreover, in the case of this embodiment, the position adjustment is started from the light control plate 7b located in the center, and the light control plates on the end side are successively adjusted. ! Even if the illuminance in the area of the adjacent light control plate changes due to adjustment, the next light control plate will be adjusted to f1m, so
There is no need to adjust the same light control plate twice or more, and adjustment work can be performed efficiently.

Further, as shown in FIG. 3, the light control plate may be fixed in an oblique position with respect to the axial direction, but in the above embodiment,
Two moving mechanisms 2 are installed at both ends of one light control plate.
0.20 are connected, and each suction cup 22 is rotatably attached to the arm 21, so that detailed measurement by the optical sensor 16 and each movement mechanism 2 by the control device W123 can be performed.
With Ill'tA of 0.20, it is also possible to adjust the position of the light control plate in an oblique position with respect to the axial direction.

Note that the present invention is not limited to the above embodiments.

That is, in the case of the above embodiment, the optical sensor 16 was moved by the threaded rod 18 and the motor 19;
A large number of optical sensors may be lined up in a predetermined irradiation range, and each moving mechanism may be operated in accordance with the measured value of each optical sensor. In this case, instead of a large number of optical sensors, It may also be a surface sensor that can measure the illuminance distribution in a predetermined irradiation range. With such a device, there is no need to use threaded rod 18, motor 19, etc.

Furthermore, if the optical system 5 is integrated with the chassis 10 in advance, there is no need to provide the optical system 15 specifically for the ms table device.

Furthermore, there is no restriction on the number of light control plates, and any number of light control plates can be used as long as they are a plurality of light control plates.

Effects of the Invention] As explained above, according to the present invention, control is performed according to the illuminance measured by the optical sensor! Since the Il device calculates the working hot water of each moving mechanism, and the moving mechanism moves each light control plate based on this calculation, the position of each light control plate can be automatically adjusted. Therefore, adjustment work can be performed efficiently.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram showing an adjustment device, a sectional view of the lighting device of the first device, FIG. 4 is a plan view, and FIG. 5 is an illuminance distribution characteristic diagram. 1...Reflector body, 2...Tube-shaped light bulb, 3...Manuscript I
! Placing plate, 7a to 7C... Dimmer plate, 14... Standard original, 15... Optical system, 16... Optical sensor, 17...
Running body, 18... Threaded rod, 19... Motor, 2
0...Movement mechanism, 23...Ill III I snow. Applicant's representative Patent attorney Takehiko Suzue 20 shuttles, 7I structure, 14 towers, 19 tons, Figure 1, Figure 4, Figure 5

Claims (1)

[Claims] The light emitted from the tube-shaped light bulb is reflected by a gutter-shaped reflector and illuminates the copy document placed on the translucent mounting plate.The light reflected by the copy document is then reflected by the optical system. At the same time, the amount of light directed toward the copy document is adjusted by a plurality of light control plates divided in the axial direction of the tube-shaped light bulb, and the positions of these light control plates are adjusted. In the copying machine, the light is controlled by a moving mechanism for moving each of the light control plates, a standard original having a standard brightness placed on a translucent mounting plate, and a light control mechanism for moving each of the light control plates, a standard document having a standard brightness placed on a transparent mounting plate, and a light control mechanism for moving each of the light control plates, a standard document having a standard brightness placed on a transparent mounting plate, and An optical sensor is provided at a corresponding position and measures the illuminance distribution of light irradiated through the optical system, and the moving mechanism is operated according to the illuminance distribution measured by the optical sensor to adjust the position of each light control plate. 1. A control device for a light control plate in a copying machine, comprising: a control device.