JPH0643793Y2 - Original illumination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a document illumination device used in an electrophotographic copying machine, a facsimile, a document reading device, or the like.

[Prior art]

Conventionally, for example, in an electrophotographic copying machine, an original placed on the upper surface of an original placing plate, which is a transparent plate, and an original illuminating device disposed below the original placing plate are moved relatively to each other, so that the original is moved. And the reflected light from the original is guided to the surface of the photoconductor, which is a light receiving body, through a mirror, a lens, etc., and an image corresponding to the original is formed.

The above-mentioned document illuminating device generally has an illumination lamp and a reflector surrounding the illumination lamp. A plurality of dimming plates, which are dimming members, are arranged on the reflecting plate in the axial direction of the lamp. This light control plate is for adjusting the unevenness of the illuminance light amount on the document surface or the unevenness of the exposure light amount on the surface of the photoconductor due to variations in manufacturing of the lamp itself or the like. The nonuniformity is eliminated by partially blocking the light with a light control plate.

[Problems to be solved by the device]

In the original illuminating device having such a structure, the illumination lamp and the reflecting plate are contaminated by floating toner, dust, dust, etc. when the copying machine is used for a long time, and the illumination performance is deteriorated, so that the cleaning is required. Since the lamp has reached the end of its life, it will be necessary to perform maintenance such as replacement. In this case, the light control plate is fixed above the illumination lamp, and for workability, the light control plate is removed upward to clean the lamp and the reflector and replace the lamp. , I sometimes forget to restore the light control plate to its original state after the work. Copiers operate without a light control plate, but of course there is a loss of image quality. Then, if it is not understood that the deterioration due to forgetting to attach the light control plate, it is necessary to check each part of the image forming element, and there is a problem that workability is extremely poor.

[Purpose of device]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a document illuminating device that can prevent forgetting to attach the light control member to a predetermined position during maintenance and inspection.

[Means for solving problems]

The original document illuminating device of the present invention for achieving the above object is an illumination lamp for illuminating an original through a transparent plate, and a position adjustable with respect to a mounting member for restricting illumination light from the illumination lamp. In a document illuminating device having a dimming member supported by a light receiving sensor disposed in the vicinity of the dimming member, and the light illuminated from the illumination lamp when the illumination lamp emits light by the light receiving sensor. And a control means for issuing a warning when detected.

Further, the light receiving sensor is a light receiving sensor for detecting the size of the original, which is arranged so as to face the transparent plate. When the light control member is not present, the light emitted from the illumination lamp is specularly reflected by the transparent plate and the light receiving sensor is provided. Is preferably configured so as to be guided to.

[Action]

According to the document illuminating device having the above-described configuration, the control unit issues a warning when the light emitted from the illumination lamp is detected by the light receiving sensor when the illumination lamp emits light, so that it is easy to forget to attach the light control member. I can know.

〔Example〕

 Embodiments will be described in detail below with reference to the accompanying drawings.

FIG. 6 is a schematic cross-sectional view showing the internal structure of the electrophotographic copying machine. In the copying machine main body 1, an optical section 2 for scanning and illuminating a document G placed on a document placing plate 11 which is a transparent plate. An image forming unit 3 that forms an image corresponding to an original image on a transfer sheet, and a transfer sheet conveying unit 4 that conveys the transfer sheet are provided. The optical unit 2 includes an illumination lamp 21, a reflector 22, mirrors 23, 2
It is composed of 4, 25, a lens 26, and a mirror 27.

Then, the illumination lamp 21, the reflector 22 and the mirror 23 are integrally moved at a predetermined speed in the direction of the arrow B, and
By moving 24 and 25 integrally in the same direction at a speed half the moving speed of the lamp 21, etc., the original G placed on the original placing plate 11 is illuminated and reflected from the original G. Light mirror
It is guided to the image forming section 3 (shown by the optical path C in FIG. 6) through the lenses 23, 24, 25, the lens 26 and the mirror 27.

FIG. 1 is a detailed sectional view of a document illuminating device of the present invention, and FIG. 2 is a perspective view of the same. The document illuminating apparatus indicated by A has a substrate 14 supported by guide members 12 and 13, and the substrate 14 is provided with the illumination lamp 21, the reflection plate 22 and a mirror 23. The illumination lamp 21 is composed of a long halogen lamp, the longitudinal direction of which is orthogonal to the scanning direction (that is, the direction perpendicular to the paper surface of FIG. 1).
It is arranged so that. The reflector 22 is a substrate 14
And is configured to surround the lighting lamp 21. Reflection surfaces 22a and 22b are formed near the illumination lamp 21, and a reflection surface 22c is formed at a position away from the reflection plate 22. At the end of the reflecting surface 22c, there is provided a reflecting surface 22d which projects from the reflecting surface 22c and has a large inclination angle. Further, a slit 22e is formed between the reflecting surface 22a and the reflecting surface 22c. A part of the light emitted from the illumination lamp 21 is reflected by the reflecting surface 22a, and the slit 22e
To be irradiated on the document surface G ₁ facing the other part of the light emitted from the illumination lamp 21 is irradiated to by document surface G ₁ reflected by the reflection surface 22b, 22c. A flange portion 22f is formed above the reflecting surface 22b, that is, above the lamp 21.
A light control plate assembly 30 is attached to 2f.

The light control plate assembly 30 has substantially the same size as the flange portion 22f, a mounting plate 31 fixedly held by the flange portion 22f with a screw 35, and a thin plate of iron, copper, aluminum, synthetic resin, or the like. It is a body and has three light control plates 32 attached to a mounting plate 31. A screw hole (not shown) is formed in the mounting plate 31, a long hole 32a is formed in the light control plate 32, and the light control plate 32 is fixed to the mounting plate 31 by a screw 33. When a part of the light emitted from the illumination lamp 21 to the original G is restricted, the screw 33 can be loosened to move the light control plate 32.

A document size detecting sensor assembly 40 is provided on the mounting plate 14. FIG. 3 is a plan view showing the arrangement of the sensors of the document size detection sensor assembly 40. The document size detection sensor assembly 40 includes light emitters 42a to 42e and a light receiver 43a.
~ 43e each has a sensor 41a ~ 41e consisting of a pair of reflective photosensors, the sensors 41a ~ 41e,
The originals Ga to Ge of the respective sizes are arranged near the ends. The document retainer switch 15 (see FIG. 1) is closed when the document retainer 15 (see FIG. 1) is closed, and the document retainer switch 16 (see FIG. 4) is reached.
Is turned on, the light emitters 42a to 42e emit light, and the light receivers 43a to 43e receive the light reflected by the document G to determine the size.

The light receiving body 43e and the reflecting surface 22d are arranged at substantially the same position in the longitudinal direction of the illumination lamp 21.

FIG. 4 is a block diagram of a main part showing a control configuration of the document illuminating device A of the present invention. Signals from the print key 10, the document pressing switch 16, and the light receiving bodies 43a to 43e are inputted to the CPU 17. . The CPU 17 causes the illumination lamp 2 to
A control signal is given to the lamp drive circuit 20 for turning on 1, the indicator drive circuit 18 for turning on the abnormality indicator 19, and the light emitter drive circuit 44 for turning on the light emitters 42a to 42e.

Next, the operation of the present invention will be described with reference to FIGS. 1, 2, and 5.

Cleaning of the above-mentioned lighting lamp 21 and reflector 22, or lighting lamp
21 When maintenance or inspection such as replacement is required, the maintenance inspector removes the screws 35, 35 and removes the light control plate assembly 30 from the flange 22f upward to remove the lighting lamp 21 and the reflector 22. Clean and replace the lamp. Then, after various operations are completed, the maintenance and inspection person turns on the power to confirm the state of the copying machine.

When the power is turned on, the CPU 17 drives the lamp drive circuit 20 and the illumination lamp 21 is turned on (step S1). Part of the light emitted from the illumination lamp 21 is reflected by the reflecting surface 22b and further reflected by the reflecting surface 22d. The light reflected by the reflecting surface 22d (indicated by the chain double-dashed line L) is the original plate.
The light is specularly reflected by the bottom surface 11a of 11 and is guided to the light receiving body (which constitutes a light receiving sensor) 43e of the document size detecting sensor assembly 40. Then, when the illumination lamp 21 is turned on, the CPU 17 determines whether or not the light receiver 43e detects light (step S
2) If the light receiver 43e detects light, display drive circuit
An abnormality indicator 19 that drives 18 and is arranged, for example, in front of the upper surface of the copying machine displays a message such as "The light control plate is removed." To warn the maintenance inspector. And
The maintenance and inspection person knows that the light control plate assembly 30 has not been mounted yet and can immediately mount it. It goes without saying that a voice warning may be given instead of the above display.

In the above embodiment, the light control plate 31 is used as the light control plate assembly.
Although it is set to 30 and attached to the flange portion 22f, the light control plate 32 may be attached directly to the flange portion 22f as a mounting member. Also, in the embodiment, a light control plate
Three 32 are used, but one may be used.

Further, in the above-described embodiment, the reflection surface of the reflection plate 22 and the bottom surface of the document placing plate are used to guide the light to the photoreceptor for detecting the document size. However, the direct light from the illumination lamp 21 is dimmed. You may make it detect by the light receiving sensor for exclusive use arrange | positioned on a board.

[Effect of device]

As described above, according to the document illumination device of the present invention, a warning is issued when the light emitted from the illumination lamp is detected by the light receiving sensor when the illumination lamp emits light, so that the light control member can be easily attached. It has the practical effect of being able to know the forgetfulness and being able to wear it immediately.

[Brief description of drawings]

FIG. 1 is a sectional view of a document illuminating device A according to the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a plan view showing the arrangement of sensors of a document size detecting sensor assembly 40, and FIG. FIG. 5 is a block diagram showing the control structure of the original illuminating device A, FIG. 5 is a flow chart showing the operation of the present invention, and FIG. 6 is a schematic diagram of an electrophotographic copying machine to which the original illuminating device A of the present invention is applied. Indicates. 11 …… Original plate (transparent plate), 11a …… Bottom, 17 …… CPU, 19 …… Error indicator, 21 …… Illumination lamp, 22
...... Reflector, 22b ...... Reflective surface, 22d ...... Reflective surface, 22f ......
Flange part, 30 ... Light control plate assembly, 31 ... Mounting plate, 32 ...
… Light control plate, 40… Original size detection sensor assembly, 43e…
… Light receiver (light receiving sensor).

Claims (2)

[Scope of utility model registration request] 1. An illumination lamp for illuminating an original through a transparent plate, and a dimming member that is positionally adjustable with respect to a mounting member in order to regulate illumination light from the illumination lamp. In the document illuminating device, a light receiving sensor arranged near the light control member, and a control means for issuing a warning when the light emitted from the illumination lamp when the light is emitted is detected by the light receiving sensor. An original illuminating device comprising: 2. The light receiving sensor is a light receiving sensor for detecting a document size, which is arranged so as to face the transparent plate, and when the light control member is not present, the light emitted from the illumination lamp is specularly reflected by the transparent plate. Claim 1 of the utility model characterized in that it is configured so as to be guided to the light receiving sensor.
The document illuminator according to the item.