JPH08278734A - Picture reader - Google Patents

Abstract

PURPOSE: To eliminate static electricity between a glass plate and an original, to remove stuck dust and to obtain the read result of an excellent picture by having a cleaning means removing the dust or the like on the glass surface, on the side of the device, of a transmissive member receiving the original. CONSTITUTION: A carriage 3 moves in the direction of an arrow orthogonal to a photoelectric transducer so as to two-dimentionally take in the picture. Thus, a cleaning mechanism 5 arranged at the carriage 3 removes the dust stuck on the glass plate 1 along with the scanning of the carriage 3. Then, a timing belt 9 is fixed at the carriage 3 by a fixing member 15, and the carriage 3 is driven by the rotation of a motor 6. The cleaning mechanism 5 is electrically grounded at outside through the carriage 3 by a changeover switch 16, so that the cleaning mechanism 5 is made to also be a discharge mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus provided with a cleaning unit or a charge eliminating unit for removing dust such as dust and the like on a document reading surface and preventing adhesion of the dust.

[0002]

2. Description of the Related Art In order to eliminate adsorption of static electricity between a glass plate and an original, static electricity generated between the glass plate, which is the original reading surface, and the original is touched by a static elimination brush arranged in the reading section. Japanese Patent Laid-Open No. 03-21158 can be cited as a conventional technique realized by doing so.

[0003]

However, the purpose of this technique is to solve the problem of adsorption due to static electricity generated between the original and the glass plate which is the original reading surface.
It is not possible to solve the problem that dust such as dust mixed in the image reading device for some reason adheres to the glass plate charged by static electricity. Therefore, there is a problem that dust attached to the glass plate during reading causes image defects.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve such a problem and not only eliminate static electricity generated between a glass plate and a document but also to remove dust such as dust. It is an object of the present invention to provide an image reading device that removes adhesion to a glass plate and obtains a good image reading result.

In order to achieve such an object, claim 1
According to the invention described above, a movable reading unit composed of a light source for irradiating a document and a photoelectric conversion element arranged one-dimensionally for converting a light quantity into an electric signal is moved by moving in a direction orthogonal to the array. An image reading apparatus for reading a document is characterized by including cleaning means for removing dust and the like on the glass surface of the transparent member that receives the document on the apparatus side.

According to a second aspect of the present invention, the transparent member for receiving the original document of the first aspect is a glass plate, the photoelectric conversion element is a CCD, and the cleaning means is a flexible member that hardly generates pressing force. Characterized by being in contact with a glass plate.

According to a third aspect of the present invention, the flexible member in contact with the glass plate of the second aspect has the same width as the reading width in the main scanning direction and is arranged in the reading unit so as to move in the sub-scanning direction. It is characterized in that dust and the like on the glass surface on the device side are removed by moving with the scanning of the reading unit.

The invention according to claim 4 is characterized by further comprising a selecting means, thereby enabling the cleaning means of claim 1 to be used by switching to the discharging means.

The invention according to claim 5 is characterized in that a charge removing means is arranged separately from the cleaning means according to claim 1.

The invention according to claim 6 is characterized in that the flexible member in contact with the glass plate according to claim 2 is made of a resin material.

The invention according to claim 7 is characterized in that the flexible member in contact with the glass plate according to claim 2 is made of a fiber material.

The invention according to claim 8 is characterized in that the flexible member in contact with the glass plate according to claim 2 has a brush shape.

[0013]

According to the present invention, good image reproducibility can be obtained by removing the adhesion of dust such as dust mixed in the CCD side of the glass plate to the glass plate.

Further, according to the present invention, since the cleaning mechanism and the static elimination mechanism are arranged separately or separately from the cleaning mechanism, the cleaning and the static elimination can be performed at the same time. Can also be resolved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is a block diagram of an embodiment of the present invention.
FIG. 3 is a configuration diagram of an image reading device in which a cleaning mechanism is arranged. In an image reading apparatus having a CCD including photoelectric conversion elements arranged one-dimensionally, a carriage 3
Moves in the direction of the arrow perpendicular to the photoelectric conversion element in order to capture an image two-dimensionally. As a result, the cleaning mechanism 5 arranged on the carriage 3 removes dust such as dust adhering to the glass plate 1 as the carriage 3 scans. At this time, the timing belt 9 is fixed to the fixing member 15
Is fixed to the carriage 3 by
Is driven by transmitting the rotation from the motor 6 via a drive pulley 7 and a timing belt 9. Further, by electrically grounding the cleaning mechanism, it can function as a charge eliminating mechanism. As a result, dust such as dust on the glass plate 1 can be removed every time the scanning is performed in the entire reading range.

FIG. 4 is a view showing the cleaning mechanism of the present invention. This is a flexible member 5 in contact with the glass plate
In this case, the vinyl resin is used in a capillary shape, and in this case, the member is not grounded and it is easy for itself to be charged and dust and
An effect of adsorbing dust such as dust is obtained, and the cleaning mechanism is provided.

FIG. 5 is a view showing another example of the cleaning mechanism of the present invention. This is a technique in which felt or sponge is adopted as a fiber material in a flexible member that is in contact with the glass plate. It is possible to remove dust and prevent static electricity.

FIG. 6 is a view showing still another example of the cleaning mechanism of the present invention. This employs a brush-like member as the flexible member that is in contact with the glass plate. In this case, the flexibility of the member is high, the pressing force is weak, and the friction against the glass plate is small, which is suitable for smooth carriage scanning.

[Embodiment 2] FIG. 2 shows another embodiment of the present invention and is a cross-sectional view. Since the cleaning mechanism can be electrically grounded to the outside through the carriage 3 by the changeover switch 16 which is the selection means, the cleaning mechanism can also serve as a charge eliminating mechanism.

This is also effective in that cleaning can be performed against dust adhesion due to static electricity, which cannot be completely removed only by the static elimination brush of Japanese Patent Laid-Open No. 03-21158.

[Embodiment 3] FIG. 3 is a block diagram showing another embodiment of the present invention. A static elimination mechanism is arranged separately from the cleaning mechanism to perform cleaning and static elimination at the same time.
Reference numerals 5 and 21 are a cleaning mechanism and a charge eliminating mechanism, respectively, but either one may correspond to the cleaning mechanism. However, the static elimination mechanism must always be grounded via 16. In addition, even during cleaning, grounding can eliminate static electricity generated by cleaning.

[0022]

According to the first aspect of the invention, since the cleaning mechanism is provided, dust such as dust can be removed, and good image reproducibility can be obtained.

According to the second aspect of the present invention, by adopting a flexible member in which the pressing force is hard to be generated in the cleaning mechanism, the friction at the contact point with the glass plate is small and the sliding of the carriage is smooth. be able to.

According to the third aspect of the present invention, since the flexible member in contact with the glass plate moves in the same width as the reading width and in the direction perpendicular thereto, the cleaning effect is exerted on the entire reading surface. I can give you.

According to the invention described in claim 4, since the removal of dust such as dust and the removal of static electricity which causes it is switched by having the selecting means, it is effective.

According to the fifth aspect of the present invention, by disposing the charge eliminating mechanism in addition to the cleaning mechanism, the cleaning and the charge eliminating can be performed simultaneously.

According to the invention of claim 6, by adopting a resin material for the flexible member which is in contact with the glass plate,
The member itself can be easily charged and dust can be adsorbed to the member.

According to the invention described in claim 7, by adopting the fiber material for the flexible member in contact with the glass plate,
The pressing force on the glass plate is less applied and the friction can be reduced. Further, the member can be soaked in advance with the solvent.

According to the eighth aspect of the present invention, since the flexible member in contact with the glass plate has the brush-like shape, the pressing force against the glass plate is less applied and the friction can be reduced. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a diagram in which a capillary vinyl resin is adopted as a cleaning mechanism of the present invention.

FIG. 5 is a diagram when a felt or sponge is adopted as the cleaning mechanism of the present invention.

FIG. 6 is a view when a brush-like member is adopted as the cleaning mechanism of the present invention.

[Explanation of symbols]

 1. Glass plate 2. Carriage reading opening 3. Carriage 4. Carriage scanning direction 5. Cleaning mechanism 6. Motor 7. Drive pulley 8. Driven pulley 9. Timing belt 10. CCD 11. Lens 12. Reflective mirror 13. Light source 14. Original document 15. Fixing member 16. Changeover switch 17. Capillary vinyl resin 18. Felt or sponge-like fiber material 19. Solvent for cleaning or static electricity 20. Brush 21. Static erasing brush

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 1/19 H04N 1/04 102

Claims (8)

[Claims] 1. A movable reading unit composed of a light source for irradiating an original and a photoelectric conversion element arranged one-dimensionally for converting a light quantity into an electric signal is moved in a direction perpendicular to the arrangement to thereby move the original. An image reading apparatus for reading an image, comprising: a cleaning unit that removes dust and the like on a glass surface of a transparent member that receives a document on the apparatus side. 2. The transparent member for receiving the original according to claim 1, wherein the transparent member is a glass plate, and the photoelectric conversion element is a CCD, and the cleaning means is in contact with the glass plate by using a flexible member that hardly generates pressing force. An image reading device characterized in that 3. The flexible member in contact with the glass plate according to claim 2 is arranged in the reading unit and has a width equal to the reading width in the main scanning direction, and when the reading unit scans in the sub-scanning direction. An image reading device characterized by removing dust and the like on the glass surface of the device side by moving. 4. The image reading apparatus according to any one of claims 1 to 3, further comprising a selecting means, so that the cleaning means according to claim 1 can be switched to a charge eliminating means for use. Reader. 5. The image reading apparatus according to claim 1, further comprising a charge eliminating unit arranged separately from the cleaning unit. 6. The image reading device according to claim 2, wherein the flexible member in contact with the glass plate is made of a resin material. 7. The image reading apparatus according to claim 2, wherein the flexible member in contact with the glass plate is made of a fiber material. 8. The image reading device according to claim 2, wherein the flexible member in contact with the glass plate has a brush shape.