JP2006301219A - Image reader and vibration preventing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader that eliminates the need to attach a fly wheel to a motor and a weight to a shaft and, moreover, prevents vibration of an optical unit. <P>SOLUTION: A cantilever-beam-shaped weight 19 with load at its leading end, which corresponds to a vibration frequency with an amplitude from a vibrating source such as a motor 15 and attenuates the amplitude of the vibration, is attached to the CCD substrate 23 of the optical unit 3 in an image reader by the use of screws 25. The weight 19 includes: a first member 41 with a U-shaped cross-section; a second member 42 disposed at one end of the first member 41, having a U-shaped cross-section and being greater in width than the first member 41; and a third member 43 disposed at the other end of the first member 41. The first member 41 to the third member 43 are integrally formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image reading apparatus and a vibration preventing apparatus used therefor, and more particularly, to an image reading apparatus such as a copying machine, a facsimile machine, a multifunction peripheral, and a scanner, and a vibration preventing apparatus used therefor.

  FIG. 5 is a plan view showing an example of the configuration of a conventional image reading apparatus, and FIG.

  Referring to FIGS. 5 and 6, an example of a conventional image reading apparatus includes a drum 1, a shaft 2, an optical unit 3, a lamp unit 4, a mirror unit 5, a wire 6, a rail 7, and a bottom plate. 8, glass 9, ramp 11, pulley 12 (12-1, 12-2), mirror 13 (13-1 to 13-3), timing belt 14, motor 15, and belt pulley 16. , A flywheel 17, a weight 18, an image sensor substrate (an example of which is a CCD (Charge Coupled Device) substrate, hereinafter referred to as a CCD substrate) 23, and a lens 24.

  The optical unit 3 includes a CCD substrate 23 and a lens 24, the lamp unit 4 includes a lamp 11 and a mirror 13-1, and the mirror unit 5 includes mirrors 13-2 and 13-3 and pulleys 31-1 and 31. -2. Each of the pulleys 31-1 and 31-2 is constituted by a coaxial double pulley.

  FIG. 6 shows a case where a document 10 for reading is placed on the glass 9.

  Wires 6 are attached between the drum 1 and the pulley 12 and between the drum 1 and the pulley 31. Further, the lamp unit 4 and the mirror unit 5 are attached to the wire 6, and the lamp unit 4 and the mirror unit 5 are moved as the wire 6 moves.

  When the light of the lamp 11 in the lamp unit 4 is irradiated on the original 10, the characters and images on the original 10 are mirror 13-1 in the lamp unit 4, mirror 13-2 in the mirror unit 5, and mirror 13-3. And is read by the CCD substrate 23 through the lens 24 in the optical unit 3.

  Further, the shaft 15 of the drum 1 is rotated via the timing belt 14 and the belt pulley 16 by driving the motor 15, and the lamp unit 4 and the mirror unit 5 on the wire 6 are moved in parallel with the document 10.

  However, this conventional image reading apparatus has a drawback that the optical unit 3 vibrates due to vibration generated by the operation of the motor 15. FIG. 7 is a diagram showing an example of a straight line 21 described on the document 10, and FIG. 8 is a diagram showing an example of a curve 22 on a read image 20 read by the CCD substrate 23.

  The straight line 21 shown in FIG. 7 is read by the CCD substrate 23 in the optical unit 3, but the read image is distorted by the vibration of the optical unit 3 and becomes a curve 22 as shown in FIG. 8.

  For this reason, in the conventional image reading apparatus, the flywheel 17 is attached to the motor 15 as an example of the countermeasure (see FIG. 5). A detailed view thereof is shown in FIG. In the figure, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted. The flywheel 17 attenuates the vibration of the motor 15.

  Moreover, the weight 18 is attached to the shaft 2 as another example of the countermeasure (refer FIG. 5). A detailed view thereof is shown in FIG. In the figure, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted. The weight 18 attenuates the vibration of the motor 15.

  On the other hand, as an example of an image reading apparatus having a function of preventing this kind of vibration, a line image sensor 52 is fixed to the upper surface of the sensor support member 30, and a vibration absorber (liquid 41, There is disclosed an invention in which a weight 42) is attached and vibration is suppressed from being transmitted to the line image sensor 52 by the vibration absorber (see, for example, Patent Document 1).

JP 2001-166396 A (paragraphs 0021 to 0025, 0033 to 0034, FIGS. 1 to 4)

  However, in the conventional image reading apparatus shown in FIG. 5, the flywheel 17 attached to the motor 15 has a disadvantage that it is expensive and increases the cost. When the weight 18 is attached to the shaft 2, a large mounting area is required. There was a drawback that the device was large.

  On the other hand, in the image reading device disclosed in Patent Document 1, the vibration absorber (the liquid 41 and the weight 42) is accommodated in the hollow box 31 (see FIGS. 2A and 2B of Patent Document 1). ) Or via an elastic member 70 (see FIGS. 3 and 4 of Patent Document 1), and not via the line image sensor 52 but via the sensor support member 30 (Patent Document). 1 to FIG. 2 to FIG. 4).

  In contrast, the vibration absorber in the image reading apparatus according to the present invention is a weight itself, and the weight is directly attached to the CCD substrate (see FIG. 1 of the present application). Therefore, the configuration is completely different from the invention disclosed in Patent Document 1.

  Accordingly, an object of the present invention is that it is not necessary to attach a flywheel to the motor and to attach a weight to the shaft, and it is possible to prevent vibration of the optical unit, thereby preventing distortion of the read image. An object of the present invention is to provide an image reading apparatus and a vibration preventing apparatus used therefor.

  In order to solve the above problems, an image reading apparatus according to the present invention is an image reading apparatus that reads an image written on a manuscript using an image sensor, and corresponds to a frequency having an amplitude from a vibration source, and It includes a cantilever-shaped weight with a tip load having a weight that attenuates the amplitude of vibration, and the weight is attached to an image sensor substrate on which the image sensor is mounted.

  The vibration preventing device according to the present invention is a vibration preventing device used for an image reading device that reads an image written on a manuscript using an imaging element, and corresponds to a vibration frequency having an amplitude from an excitation source. The weight is configured to be a cantilever-shaped weight with a tip load having a weight for attenuating the amplitude, and the weight is attached to an image sensor substrate on which the image sensor is mounted.

  According to the present invention, since the weight is directly attached to the image sensor substrate, vibration can be efficiently suppressed, and the structure is simple, so that the cost can be reduced.

  According to the present invention, by including the above-described configuration, it is not necessary to attach a flywheel to the motor and a weight to the shaft, and it is possible to prevent vibration of the optical unit. It becomes possible to prevent.

  Further, since the vibration absorber is a weight itself, the structure is simple and the cost can be reduced. Further, the mounting area can be reduced, and the apparatus can be miniaturized. Furthermore, since the weight is directly attached to a portion where vibration is to be suppressed, that is, a CCD substrate, vibration can be efficiently suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of an example of an image reading apparatus according to the present invention. In the figure, only the portion related to the vibration preventing device in the image reading device is displayed, and the other components are the same as the conventional example shown in FIG. In FIG. 1, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted.

  Referring to FIG. 1, a weight 19 is attached to the CCD substrate 23 of the optical unit 3 with a screw 25. The weight 19 is a vibration preventing device according to the present invention. The weight 19 corresponds to a frequency having an amplitude from a vibration source such as the motor 15, and is formed in a cantilever shape with a tip load having a weight that attenuates the amplitude of the vibration.

  FIG. 2 is a perspective view of the first embodiment of the vibration preventing apparatus according to the present invention. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. Referring to the figure, the weight 19-1 has a U-shaped first member 41 and a U-shaped first member 41 provided at one end of the first member 41 and wider than the first member 41. The second member 42 and a third member 43 provided at the other end of the first member 41 are configured, and the first member 41 to the third member 43 are integrally formed.

  But the structure which makes the 1st member 41 and the 2nd member 42 an independent member, and mutually joins is also possible.

  Further, a hole (not shown) for allowing the screw 25 to pass through is formed in the third member 43, and the weight 19-1 is attached to the CCD substrate 23 with the screw 25 through this hole. Further, the attachment position of the weight 19-1 is above the lens 24, and the lens 24 is covered with the weight 19-1.

  Next, the operation of the first embodiment will be described. FIG. 3 is a schematic diagram showing an example of the operation of the first embodiment. In the figure, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 3, an impact generated during the operation of the motor 15 (see FIG. 5) is transmitted to the housing of the image reading apparatus and then to the optical unit 3, but the weight 19-1 vibrates (vibration). A) The vibration (vibration B) transmitted to the optical unit 3 is canceled and attenuated to prevent the CCD substrate 23 from vibrating.

  According to the first embodiment of the present invention, the flywheel 17 attached to the motor 15 becomes unnecessary, and the cost can be reduced. Moreover, it is not necessary to attach the weight 18 to the shaft 2, and the apparatus can be miniaturized.

  FIG. 4 is a perspective view of a second embodiment of the vibration preventing apparatus according to the present invention. In the figure, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Referring to the figure, the weight 19-2 is different from the weight 19-1 of the first embodiment in that the fourth member 44 corresponding to the second member 42 of the first embodiment is formed on a flat plate. It is. Other shapes are the same as in the first embodiment.

  According to the second embodiment of the present invention, since the fourth member 44 does not need to be bent, man-hours can be reduced.

  In this embodiment, examples of the shape of the weight 19 are shown in FIGS. 2 and 4. However, the shape is not limited to these, and the amplitude of the vibration corresponds to the frequency having the amplitude from the vibration source. The present invention can be applied to other shapes as long as the tip load cantilever shape having a weight to be attenuated is satisfied.

1 is a perspective view of an example of an image reading apparatus according to the present invention. 1 is a perspective view of a first embodiment of a vibration preventing apparatus according to the present invention. It is a schematic diagram which shows an example of operation | movement of 1st Example. It is a perspective view of 2nd Example of the vibration preventing device which concerns on this invention. It is a top view which shows an example of a structure of the conventional image reading apparatus. It is AA 'sectional drawing of FIG. FIG. 3 is a diagram illustrating an example of a straight line 21 described on a document 10. It is a figure which shows an example of the curve 22 on the reading image 20 read with the CCD board | substrate 23. FIG. It is a figure which shows an example which attached the flywheel 17 to the conventional motor 15. FIG. It is a figure which shows an example which attached the weight 18 to the conventional shaft 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum 2 Shaft 3 Optical unit 4 Lamp unit 5 Mirror unit 6 Wire 7 Rail 8 Bottom plate 9 Glass 11 Lamp 12 Pulley 13 Mirror 14 Timing belt 15 Motor 16 Belt pulley 19 Weight 23 CCD (Charge Coupled Device) board 24 Lens 25 Screw 41 First member 42 Second member 43 Third member 44 Fourth member

Claims (6)

An image reading apparatus that reads an image written on a document using an image sensor,
Corresponding to the frequency with the amplitude from the source of vibration, including the weight of the tip load cantilever with the weight to attenuate the amplitude of the vibration,
An image reading apparatus, wherein the weight is attached to an image sensor substrate on which the image sensor is mounted. The weight includes a first member having a U-shaped cross-section, a second member provided at one end of the first member and having a U-shaped cross-section and wider than the first member, and the first member And a third member provided at the other end of the member, wherein the first member to the third member are integrally formed, and the third member is attached to the imaging element substrate. The image reading apparatus according to claim 1. The weight includes a first member having a U-shaped cross section, a second member that is a flat plate provided at one end of the first member, and a third member provided at the other end of the first member. The image reading apparatus according to claim 1, wherein the first member to the third member are integrally formed, and the third member is attached to the imaging element substrate. An anti-vibration device used in an image reading device that reads an image written on a document using an image sensor,
Consists of a cantilevered weight with a tip load that has the weight to attenuate the amplitude of the vibration, corresponding to the frequency having the amplitude from the vibration source,
The vibration preventing apparatus, wherein the weight is attached to an image sensor substrate on which the image sensor is mounted. The weight includes a first member having a U-shaped cross-section, a second member provided at one end of the first member and having a U-shaped cross-section and wider than the first member, and the first member And a third member provided at the other end of the member, wherein the first member to the third member are integrally formed, and the third member is attached to the imaging element substrate. The vibration preventing apparatus according to claim 4. The weight includes a first member having a U-shaped cross section, a second member that is a flat plate provided at one end of the first member, and a third member provided at the other end of the first member. The vibration preventing apparatus according to claim 4, wherein the first member to the third member are integrally formed, and the third member is attached to the imaging element substrate.

Images