JP2006319605A - Original reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress vibration that occurs in an image sensor part satisfactorily. <P>SOLUTION: The original reading apparatus is provided with an image sensor unit 3 for reading an original 10, a supporting frame 19 provided with the image sensor unit 3 fixed to support the image sensor unit 3, and a chassis 8 for supporting the supporting frame 19. The original reading apparatus is also provided with a plate spring 17 wherein one end is brought into contact with the supporting frame 19, the other end is brought into contact with the chassis 8, and the supporting frame 19 is biased in the direction of being separated from the chassis 8 to thereby suppress vibrations that occur in the image sensor unit 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an original reading apparatus in which an image sensor unit for reading an original is fixed and arranged.

  For example, some document reading devices such as a copying machine and a scanner device have an arrangement in which an image sensor unit for reading a document as an image is fixed in the device.

  This type of image reading apparatus includes an image sensor unit for reading an original, a light source unit for irradiating the original with illumination light, and a mirror unit for guiding reflected light from the original 10 to the image sensor unit. The structure provided is disclosed (for example, refer patent document 1).

  As shown in FIGS. 5 and 6, the image sensor unit 103 provided in the conventional document reading apparatus is fixedly disposed in the apparatus, and a lens 124 that collects reflected light from the document, and the lens 124. A CCD (Charge-Coupled Device) 123 for receiving the reflected light collected by the laser beam and reading it as an image, and a support frame 119 for supporting the lens 124 and the CCD 123.

  The support frame 119 is formed in a long shape by a metal plate material, and both ends in the longitudinal direction are fixed to the support wall member 114 provided on the chassis 108, or a support wall formed integrally with the chassis 108. The fixing screws 118 are fixed with screws.

  Although not shown, the conventional document reading apparatus includes a movable light source unit and a mirror unit that are moved with respect to the document. The light source unit and the mirror unit are connected to a wire of a moving mechanism, and the light source unit and the mirror unit are pulled and moved in parallel with the document by winding the wire around the outer periphery of the drive drum.

  The conventional document reading apparatus is configured to read the reflected light reflected by the light source unit and the mirror unit by the image sensor unit 103 as an image by the CCD 123 through the lens 124.

  By the way, although not shown in the figure, the conventional document reading device is not shown in the figure, when an operation panel is operated, an ADF (Auto Document Feeder) feeding operation of a document on a glass plate on which the document is placed, The image sensor unit 103 vibrates due to vibration, impact, etc. generated by the operation of the motor.

  For this reason, when the CCD 123 mounted on the image sensor unit 103 vibrates, an image read by the CCD 123 is displayed on a straight line 121 drawn on the original 110 as shown in a read image 120 as shown in FIG. There is a problem that a distorted distortion occurs.

Therefore, in order to suppress vibration generated in the image sensor unit 103, the following measures are taken in the conventional document reading apparatus.
1) As shown in FIG. 5, a support frame 119 that supports the image sensor unit 103 is formed with an extension of a fixing piece 119a that is fixed to the bottom surface of the chassis 108. The fixing piece 119a and the chassis 108 are extended over a wide range. By fixing with a fixing screw 118, the rigidity of the support frame 119 is increased and the vibration generated in the image sensor unit 103 is attenuated.
2) The thickness of the metal plate material constituting the support frame 119 is increased, the rigidity of the support frame 119 is increased, and the vibration generated in the image sensor unit 103 is attenuated.
3) Placing a plate-like weight 125 on the support frame 119 with a fixing screw 118 to increase the weight of the support frame 119, thereby attenuating vibrations generated in the image sensor unit 103.
JP 7-38709 A

However, the conventional document reading apparatus taking the above-described measures has the following problems.
1) When the support frame 119 and the bottom plate 108 are screwed with the fixing screws 118, the vibration transmission path changes due to the influence of the deflection generated in the chassis 108, and the vibration transmitted to the CCD 123 changes. That is, the vibration suppressing action has a disadvantage that an influence due to the variation of the manufacturing lot occurs.
2) When the thickness of the metal plate constituting the support frame 119 is increased, there is an inconvenience that the weight of the entire apparatus is increased and the cost of parts is increased.
3) Attaching the weight 125 to the support frame 119 increases the number of parts, increases the burden of assembly work, increases the assembly time (increases man-hours), and increases the manufacturing cost.

  Further, as shown in FIG. 8A, as a measure against EMI (Electro Magnetic Interference), there is a configuration in which a conductive member 126 is disposed between the support frame 119 and the chassis 108. However, the conductive member 126 is not intended to suppress vibration of the image sensor unit 103, but is intended to improve conductivity as a measure against EMI. As shown in FIG. 8B, the conductive member 126 has a plurality of strip-shaped contact pieces 126a formed at one end thereof that is in contact with the chassis 108, and has a complicated shape. , Processing costs increase.

  SUMMARY An advantage of some aspects of the invention is that it provides a document reading apparatus capable of satisfactorily suppressing vibration generated in an image sensor unit.

  In order to achieve the above-described object, an original reading apparatus according to the present invention includes an image sensor unit that reads an original, a support frame that is provided with the image sensor unit fixed and supports the image sensor unit, and supports the support frame. Chassis. The document reading device is provided with one end abutting against the support frame and the other end abutting against the chassis, and biasing the support frame away from the chassis, thereby generating vibrations in the image sensor unit. Vibration suppression means for suppressing the vibration.

  According to the document reading apparatus according to the present invention configured as described above, when vibration occurs in the support frame on which the image sensor unit is supported, vibration generated in the support frame is well absorbed by the vibration suppressing means. It is attenuated and the occurrence of vibration in the image sensor unit is suppressed.

  As described above, according to the document reading apparatus according to the present invention, it is possible to satisfactorily suppress vibration generated in the image sensor unit.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  The document reading apparatus according to the present embodiment is applied to, for example, a copying machine and a scanner apparatus.

  As shown in FIGS. 1 and 2, the document reading device includes an image sensor unit 3 for reading a document 10 placed on a glass plate 9, and a light source unit 4 for irradiating the document 10 with illumination light. The mirror unit 5 for guiding the reflected light from the document 10 to the image sensor unit 3, the moving mechanism 6 for moving the light source unit 4 and the mirror unit 5 with respect to the document, and the units 3, 4, and 5 are supported. The chassis 8 is provided.

  As shown in FIG. 3 and FIGS. 4A and 4B, the image sensor unit 3 is fixedly arranged in the apparatus and collects the reflected light from the document 10, and this lens. A CCD (Charge-Coupled Device) 23 for receiving the reflected light collected by 24 and reading it as an image, and a support frame 19 for supporting the lens 24 and the CCD 23 are provided.

  The support frame 19 is formed in a substantially U-shaped cross section by a long metal plate material, and both ends in the longitudinal direction are formed on the chassis 8, or formed integrally with the chassis 8. Each of the support walls is fixed with screws by fixing screws 18. A CCD 23 is provided at a substantially central portion in the longitudinal direction of the support frame 19, and a lens 24 is fixed to the CCD 23.

  In the image sensor unit 3, a leaf spring 17 as vibration suppressing means for suppressing vibration generated in the support frame 19 is provided in the vicinity of the CCD 23 and on one side in the longitudinal direction of the support frame 19. . One end of the leaf spring 17 is fixed to one side of the support frame 19 with a fixing screw 18 and the other end is in contact with the chassis 8, and is attached in a direction in which the support frame 19 is separated from the chassis 8 by elastic force. It is fast.

  Although the image sensor unit 3 described above is configured to suppress vibration by the leaf spring 17, although not illustrated, for example, a compression coil spring or a torsion coil spring is provided in the gap between the support frame 19 and the chassis 8. The same effect can be obtained even if a configuration is adopted in which one end is fixed to the support frame 19 and the other end is in contact with the chassis 8. Further, the leaf springs 17 may be provided at a plurality of locations in the longitudinal direction of the support frame 19 as necessary.

  As shown in FIGS. 1 and 2, the light source unit 4 is configured to be movable in the apparatus, and includes a lamp 11 that emits illumination light to a document 10 placed on a glass plate 9, and And a reflection mirror 12 for reflecting the reflected light to the mirror unit 5.

  The mirror unit 5 is configured to be movable together with the light source unit 4, and includes reflection mirrors 13 a and 13 b that reflect the reflected light from the reflection mirror 12 of the light source unit 4 to the image sensor unit 3.

  The moving mechanism 6 includes a motor 30, a belt pulley 32 that is rotationally driven by the motor 30 via a timing belt 31, a drive shaft 33 to which the belt pulley 32 is fixed, and a drive drum that is rotated together with the drive shaft 33. 34, the wire 36 spanned between the drive drum 34 and the pulley 35, and the main surface of the glass plate 9 on which the document 10 is placed are supported so that the light source unit 4 and the mirror unit 5 can move in parallel. Guide rails 37a and 37b.

  The light source unit 4 and the mirror unit 5 are integrally connected to a wire 36, and the wire 36 is wound around the outer peripheral portion of the drive drum 34, whereby the light source unit 4 and the mirror unit 5 are pulled, and the document 10 parallel to the reading surface.

  The image sensor unit 3 included in the document reading apparatus configured as described above is supported by, for example, operation of an operation panel (not shown) by the user, vibration by the motor 30 of the moving mechanism 6, shock from the outside, or the like. When vibration is transmitted to the frame 19, the leaf spring 17 is elastically deformed in the gap between the support frame 19 and the chassis 8, so that the vibration of the support frame 19 is well absorbed and damped. For this reason, the occurrence of vibration in the image sensor unit 3 supported by the support frame 19 is satisfactorily suppressed.

  The leaf spring 17 is provided with one end fixed to the support frame 19 and the other end in contact with the chassis 8. The leaf spring 17 is manufactured, for example, by urging the support frame 19 away from the chassis 8. Even when the vibration transmission path changes due to a deflection or the like generated in the chassis 8 depending on the lot, it is possible to suppress variation in the vibration suppressing action.

  As described above, according to the document reading apparatus, one end is fixed to the support frame 19, and the other end is provided in contact with the chassis 8, and urges the support frame 19 away from the chassis 8. By providing the leaf spring 17 in the image sensor unit 3, it is possible to satisfactorily suppress the vibration generated in the image sensor unit 3, and to suppress the variation in the suppressing action.

  Further, according to this document reading apparatus, the vibration generated in the image sensor unit 3 is satisfactorily suppressed by fixing the leaf spring 17 having a relatively simple structure to the support frame 19 with the fixing screw 18. The manufacturing cost required for suppressing the vibration of the image sensor unit can be reduced.

  In the document reading apparatus according to the present embodiment, the configuration including the light source unit 4 and the mirror unit 5 that are moved with respect to the document 10 is employed. However, the image sensor unit 3 may be fixed and disposed. Of course, an automatic feeding unit (not shown) for feeding the document 10 onto the glass plate 9 may be provided.

  Further, in the document reading apparatus of the present embodiment, a configuration is adopted in which the leaf spring 17 fixed to the support frame 19 is brought into contact with the bottom plate formed by the chassis 8, but a part of the chassis 8 is a glass plate. A configuration may be adopted in which a top plate on the 9 side is configured and a plate spring fixed to the support frame 19 is brought into contact with the top plate.

1 is a plan view showing a document reading device of the present embodiment. FIG. 2 is a side view showing the document reading device. It is a perspective view which shows an image sensor unit. It is a figure for demonstrating the leaf | plate spring of an image sensor unit. It is a perspective view which shows the conventional image sensor unit. It is a side view which shows the conventional image sensor unit. It is a figure for demonstrating the distortion which arises in a read image. It is a perspective view which shows the other conventional image sensor unit.

Explanation of symbols

3 Image sensor unit 4 Light source unit 8 Chassis 17 Leaf spring 18 Fixing screw 19 Support frame

Claims (6)

An image sensor unit for reading a document;
The image sensor unit is fixedly provided, and a support frame that supports the image sensor unit;
A chassis that supports the support frame;
One end is abutted against the support frame, the other end is abutted against the chassis, and the support frame is biased in a direction away from the chassis, thereby suppressing vibration generated in the image sensor unit. An original reading apparatus comprising vibration suppression means.   The document reading apparatus according to claim 1, wherein the vibration suppressing unit includes a spring member having one end fixed to the support frame and the other end in contact with the chassis.   The document reading apparatus according to claim 2, wherein the spring member is a leaf spring. The support frame is formed in an elongated shape, and both ends in the longitudinal direction are supported by being screwed and fixed to the chassis,
The document reading apparatus according to claim 1, wherein the vibration suppressing unit is disposed at a central portion in a longitudinal direction of the support frame.   5. The document reading device according to claim 1, wherein a light source unit that emits illumination light to the document is disposed separately from the image sensor unit. 6.   5. The image sensor unit according to claim 1, further comprising: a lens system that guides light reflected from the document; and a CCD that receives light guided by the lens system. Original reading device.

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