JP2005043565A - Image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader in which dirt and dust or the like are prevented from intruding into an inside housing, the dirt and the dust or the like are thereby prevented from adhering to each of mirrors with which an optical system moving unit is equipped and also, a deterioration in an image is prevented. <P>SOLUTION: Elastic seal members 70 and 71 for respectively sealing insertion holes 30 and 31 are provided on the back surface of an outside cover 2 (that is, the back surface 2c of a left side plate 2a). The one-side ends 70a and 71a of the elastic seal members 70 and 71 are each stuck to the back surface of the cover 2. In the case of inserting set screws 18 and 19 respectively through the insertion holes 30 and 31 formed on the outside cover 2, the elastic seal members 70 and 71 are pressed and bent by the set screws 18 and 19, and come to a position where the set screws 18 and 19 are allowed to be respectively inserted through the insertion holes 30 and 31 formed on the outside cover 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image reading apparatus that reads an image of a document by being used alone as a scanner or mounted on a copying machine, a facsimile, or the like.
[0002]
[Prior art]
In general, an image reading apparatus irradiates a document with light, reflects the reflected light through a plurality of mirrors, guides it to a reading device such as a CCD through a condenser lens, and the reading device converts an image of the document to an electrical signal. As to get (read).
[0003]
Here, in such an image reading apparatus, when the apparatus is transported, the optical system moving unit provided in the image reading apparatus may be vigorously shaken or vibrated and deformed or damaged.
[0004]
Therefore, in order to avoid the above inconvenience, an image reading apparatus having a structure for fixing the optical system moving unit to the apparatus main body has been proposed. In this image reading apparatus, the fixing member for fixing the optical system moving unit to the outer cover and the insertion hole formed in the internal housing so as to be substantially parallel to the moving direction of the optical system moving unit Is inserted from the outside of the apparatus main body, and the fixing member is screwed into a screw hole formed in the optical system moving unit so as to be substantially parallel to the moving direction of the optical system moving unit. The system moving unit is fixed to the apparatus main body (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Examined Patent Publication No. 7-104558 (Page 2-3, Figure 2-4)
[0006]
[Problems to be solved by the invention]
However, in the conventional image reading apparatus, although movement of the optical system moving unit during transportation can be restricted and damage and deformation of the optical system moving unit and its peripheral parts can be prevented, as described above, the exterior Since the insertion hole formed in the cover and the inner housing is formed to be substantially parallel to the moving direction of the optical system moving unit, the fixing member is removed to release the fixed state of the optical system moving unit, When using an image reading device, dust, dust, and the like from the outside easily enter the internal housing via the insertion hole, and as a result, the dust is placed on each mirror included in the optical system moving unit. As a result, there is a disadvantage that the image is deteriorated due to adhesion of dust and the like.
[0007]
Therefore, the present invention has been made in view of the above problems, and prevents entry of dust and dirt into the internal housing, and prevents adhesion of dust and dirt to each mirror provided in the optical system moving unit. Another object of the present invention is to provide an image reading apparatus capable of preventing image deterioration.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an image reading apparatus according to the present invention includes an optical system moving unit that holds a mirror that further reflects reflected light from a document, an exterior cover of the apparatus body, and an internal housing of the apparatus body. In addition, the fixing member for fixing the optical system moving unit is inserted into the holes formed in each of the optical system moving unit, the exterior cover, and the inner housing, and the fixing member is attached to the optical system moving unit, thereby In the image reading apparatus for fixing the system moving unit to the image reading apparatus main body, an elastic seal member for sealing a hole formed in the outer cover is provided on the back surface of the outer cover, and one end portion of the elastic seal member Is affixed to the back surface of the exterior cover.
[0009]
Here, in the present invention, when the fixing member is inserted into the hole formed in the exterior cover, the elastic seal member is pushed by the fixing member to bend, and the fixing member is inserted into the hole formed in the exterior cover. The elastic seal member can be at a position where this is allowed.
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an image reading apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a drive mechanism of an image reading apparatus according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an optical configuration of the image reading apparatus according to the embodiment of the present invention. is there.
[0010]
As shown in FIGS. 1 and 2, the image reading apparatus 1 has an outer shape composed of an exterior cover 2 formed of a metal plate, and includes a left side plate 2 a and a right side plate 2 b. An internal housing 7 is provided inside the exterior cover 2, and the image reading apparatus main body 1 a is configured by the exterior cover 2 and the internal housing 7. A contact glass 3 on which a document is placed is provided on the upper surface of the exterior cover 2. In the exterior cover 2 (or in the internal housing 7), the first and second independent from each other so as to be reciprocally movable parallel to the contact glass 3 (that is, in the direction of the arrow X). Optical system moving units 4 and 5 are supported.
[0011]
First, a detailed optical configuration will be described. As shown in FIGS. 1 and 2, the first optical system moving unit 4 includes a first optical system support member 40 that holds various components, and the first optical system support member 40 includes the first optical system support member 40. , A lamp 41 which is a light source for irradiating light on a document placed on the contact glass 3, a reflecting plate 42 for efficiently irradiating the document with light from the lamp 41, reflected light from the document (hereinafter, referred to as “light source”). And a first mirror 43 that further reflects the light toward the second optical system unit 5. On the other hand, the second optical system moving unit 5 has a second optical system support member 50 that holds various components, and the second optical system support member 50 is a document from the first mirror 43. Second and third mirrors 51 and 52 are provided that further reflect the reflected light and guide it to an image reading unit 6 described later. In FIG. 2, the optical path of the document reflected light is indicated by a one-dot chain line.
[0012]
In addition, as shown in FIG. 2, a condensing lens 60, in order from the upstream side of the optical path of the above-described document reflected light, is arranged in the outer cover 2 (or the inner housing 7) slightly closer to the right side plate 2b than the center. In addition, an image reading unit 6 having a CCD substrate 61 as a reading device is disposed.
[0013]
The image reading unit 6 has a base 62 that holds a mounting base 63 to which various components including a condenser lens 60 and a CCD substrate 61 are attached. The base 62 is screwed on the bottom plate of the exterior cover 2. It is fixed with etc. A mounting base 63 is fixed to the upper surface of the base 62 with screws or the like. A lens fixing plate (not shown) to which the condenser lens 60 is fixed and a CCD substrate 61 are fixed to the upper surface of the mounting base 63. A CCD connecting plate 65 that connects the CCD fixing plate 64 is attached.
[0014]
However, the lens fixing plate and the CCD connecting plate 65 are adjusted in the optical axis direction of the original reflected light so that the focal length of the original reflected light condensed by the condenser lens 60 with respect to the CCD substrate 61 is uniform. Is possible. Further, for adjusting the height of the CCD substrate 61 with respect to the optical axis of the original reflected light, a height adjusting screw 66 that passes through the CCD fixing plate 64 and is screwed to the CCD connecting plate 65, and the height adjusting screw 66 are inserted. A compression coil spring 67 interposed between the CCD fixing plate 64 and the CCD connecting plate 65 is provided, and the CCD fixing plate 64 is elastically deformed by the degree of screwing of the height adjusting screw 66. As a result, the height of the CCD substrate 61 is adjusted by moving up and down with respect to the CCD connecting plate 65 while receiving the force. A CCD cover 68 surrounding the CCD substrate 61 is fixed to the CCD fixing plate 64 via a gasket 69.
[0015]
Next, a detailed configuration for driving the reciprocating movement of the first and second optical system moving units 4 and 5 will be described. The first and second optical system moving units 4 and 5 are reciprocated so as to scan over the entire area of the document. At this time, the first optical system moving unit 4 has the second optical system. The moving unit 5 is always reciprocated at a speed twice that of the moving unit 5, so that the focal length of the original reflected light with respect to the CCD substrate 61, that is, the optical path length of the original reflected light is always constant. Such a reciprocating movement can be achieved with the following configuration.
[0016]
As shown in FIGS. 1 and 2, a rotating shaft 8 that is rotatably supported is disposed behind the image reading unit 6 (near the right side plate 2 b). In the vicinity of the rotating shaft 8, a drum 80 around which a wire 9 for reciprocating the first and second optical system moving units 4 and 5 is wound is coaxially and integrally fixed.
[0017]
Further, a joint pulley 81 is connected to one end portion of the rotating shaft 8, and driving is transmitted from a driving source such as a driving motor by a belt 11 stretched around the joint pulley 81. That is, a drive motor 10 serving as a drive source for the rotation of the rotary shaft 8 is disposed outside the rear side of the exterior cover 2 (the back side of the paper in FIG. 1), and an output shaft of the drive motor 10 is provided. The belt 11 is stretched between the joint pulley 81 connected to the rotary shaft 8, and the rotational output of the drive motor 10 is transmitted to the rotary shaft 8 by the belt 11. In some cases, instead of the joint pulley 81 and the belt 11, a driving force transmission medium may be constituted by gears.
[0018]
Further, in order from the left side in the exterior cover 2, a first hanging tool 12 projecting from the left side plate 7 a of the internal housing 7 and a first support 12 pivotally supported by front and rear side plates (not shown) of the exterior cover 2. 1 pulley 13, the second pulley 14 pivotally supported by the second optical system moving frame 50, the second hook 15 projecting from the base 62 of the image reading unit 6, and the right side plate 2b. A third pulley 16 is provided which is projected and pivotally supported. Furthermore, a guide rail 17 that guides the reciprocal movement of each of the first and second optical system moving units 4 and 5 is provided so as to extend in parallel with the contact glass 3.
[0019]
As shown in FIG. 1, one end of the wire 9 that actually controls the reciprocating movement of the first and second optical system moving units 4 and 5 is fixed to the first hanging tool 12, and the second pulley is temporarily provided. 14, and then wound around the first pulley 13, wound around the drum 80 of the rotating shaft 8 a plurality of times, and then hooked back onto the third pulley 16 and then moved to the first optical system. The frame body 40 is fixed and is again hung on the second pulley 14, and the other end is fixed to the second hook 15 and is stretched.
[0020]
Under such a configuration, when the output shaft of the drive motor 10 is rotated forward or backward, the drum 80 is rotated forward or backward together with the rotational shaft 8, and the wire 9 is moved accordingly. The first and second optical system moving units 4 and 5 reciprocate while maintaining a predetermined speed ratio. Thus, the first and second optical system moving units 4 and 5 are reciprocated in parallel with the document surface over the entire document so that the image of the document can be read.
[0021]
The above-described image reading apparatus 1 is a so-called separate device in which a CCD substrate 61 (including the condensing lens 60) as a reading device is fixed to the exterior cover 2 separately from the optical system moving unit that actually scans. There is also a so-called integrated type in which the CCD substrate 61 is fixed to the optical system moving unit and scanned integrally therewith.
[0022]
Next, the fixing of the optical system moving unit in the image reading apparatus according to the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a longitudinal sectional view showing a fixing mechanism of the image reading apparatus according to the embodiment of the present invention.
[0023]
In this embodiment, set screws 18 and 19 are used as fixing members when fixing the first and second optical system moving units 4 and 5, and the first and second optical system moving units 4 and 5 are fixed. At this time, the set screws 18 and 19 are attached from a direction parallel to the reciprocating direction (X direction in the drawing) of the first and second optical system moving units 4 and 5, but the back surface of the outer cover 2 (that is, The back surface 2c) of the left side plate 2a is characterized in that elastic sealing members 70 and 71 for sealing the insertion holes 30 and 31 are provided. This feature will be described in detail below.
[0024]
As shown in FIG. 3, insertion holes 30 and 31 are formed in the left side plate 2 a of the exterior cover 2, and insertion holes 32 and 33 are formed in the left side plate 7 a of the internal housing 7. The set screws 18 and 19 have screw portions 18a and 19a, respectively.
[0025]
Further, the first optical system support member 40 is provided with a bent portion 41 that comes into contact with the inner housing 7, and the bent portion 41 has a screw hole 42 at a position corresponding to the insertion hole 32. Is formed. Similarly, the second optical system support member 50 is provided with a bent portion 51 that comes into contact with the inner housing 7. The bent portion 51 is screwed at a position corresponding to the insertion hole 33. A hole 52 is formed.
[0026]
When the first and second optical system moving units 4 and 5 are fixed, first, the set screw 18 is inserted into the insertion holes 30 and 32 and the set screw 19 is inserted from the outside of the exterior cover 2. The holes 31 and 33 are inserted. Next, by screwing the screw portion 18a into the screw hole 42 formed in the first optical system support member 40, the set screw 18 is inserted into the screw hole 42, and the first optical system support member 40 is inserted into the internal housing. By attaching to the body 7, the first optical system moving unit 4 is fixed to the image reading apparatus main body 1 a and the screw portion 19 a is screwed into the screw hole 52 formed in the second optical system support member 50. As a result, the set screw 19 is inserted into the screw hole 52 and the second optical system support member 50 is attached to the inner housing 7, whereby the second optical system moving unit 5 is attached to the image reading apparatus main body 1 a. The configuration is fixed. FIG. 4 shows a state in which the first and second optical system moving units 4 and 5 are fixed to the image reading apparatus main body 1a.
[0027]
In addition, it is good also as a structure which forms a slit (not shown) in the said set screws 18 and 19 and rotates these set screws 18 and 19 using rotation tools, such as a driver, or uses a rotation tool. It is good also as a structure which can be rotated manually.
[0028]
With the above configuration, the movement of the first and second optical system moving units 4 and 5 during transportation is restricted, the first and second optical system moving units 4 and 5 and their peripheral parts are destroyed, It is possible to suppress the deviation of the optical axis of the projection optical system inside the first and second optical system moving units 4 and 5.
[0029]
Here, in this embodiment, as shown in FIG. 3, the elastic sealing members 70 and 71 for sealing the insertion holes 30 and 31 to the back surface of the exterior cover 2 (that is, the back surface 2c of the left side plate 2a), respectively. It is set as the structure which provides. The elastic seal members 70 and 71 are made of, for example, resin, rubber, or the like. As shown in FIG. 3, the one end portions 70a and 71a are respectively attached to the back surface of the exterior cover 2 described above. .
[0030]
In the state where the set screws 18 and 19 are attached and the first and second optical system moving units 4 and 5 are fixed, as described above, only the one end sides 70a and 71a of the elastic seal members 70 and 71 are Since each is attached to the back surface 2c of the left side plate 2a, as shown in FIG. 4, when inserting the set screws 18 and 19 into the insertion holes 30 and 31 respectively formed in the exterior cover 2, The elastic seal members 70 and 71 are pressed by the set screws 18 and 19 to bend, and the set screws 18 and 19 are allowed to be inserted into the insertion holes 30 and 31 formed in the exterior cover 2, respectively. The elastic sealing members 70 and 71 are included.
[0031]
Therefore, according to this configuration, when the image reading apparatus 1 is used by removing the set screws 18 and 19 to release the fixed state of the first and second optical system moving units 4 and 5, the elastic seal member 70 is used. , 71 seal the insertion holes 30 and 31, respectively, so that dust, dust and the like can be prevented from entering the internal housing 7. Accordingly, it is possible to prevent the dust, dust, and the like from adhering to the first, second, and third mirrors 43, 51, and 52 included in the first and second optical movement units 4 and 5. As a result, deterioration of the image can be prevented.
[0032]
In addition, this invention is not limited to the said embodiment, Based on the meaning of this invention, it is possible to change suitably the structure of each part, a shape, etc., and excludes them from the scope of the present invention. is not.
[0033]
For example, in the above embodiment, the set screws 18 and 19 are inserted into the screw holes 42 and 52 formed in the first and second optical system support members 40 and 50. A locking pin is used instead of the screw hole 42, 52, and a locking hole is formed in place of the screw holes 42, 52, and the locking pin is engaged with and disengaged from the locking hole, thereby supporting the first and second optical systems. The members 40 and 50 may be attached to the inner housing 7 and fixed to the image reading apparatus main body 1a and released from the fixing.
[0034]
【The invention's effect】
As described above, according to the present invention, when the image reading device is used by removing the set screw to release the optical system moving unit, the elastic seal member seals the insertion hole formed in the exterior cover. Therefore, it is possible to prevent dust, dust, and the like from entering the internal housing. Accordingly, it is possible to prevent dust and dirt from adhering to the mirrors, and as a result, it is possible to prevent image deterioration.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a drive mechanism of an image reading apparatus according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing an optical configuration of the image reading apparatus according to the embodiment of the present invention.
FIG. 3 is a longitudinal sectional view showing a fixing mechanism of the image reading apparatus according to the embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a fixing mechanism of the image reading apparatus according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image reading apparatus 1a Image reading apparatus main body 2 Exterior cover 4 1st optical system moving unit 5 2nd optical system moving unit 7 Internal housing | casing 18, 19 Set screw 30, 31 Insertion hole 32, 33 Insertion hole 40 1st Optical system moving frame body 42 Screw hole 50 Second optical system moving frame body 52 Screw holes 70, 71 Elastic member

Claims (2)

An optical system moving unit that holds a mirror that further reflects light reflected from the document, an exterior cover of the apparatus main body, and an internal housing of the apparatus main body, and a fixing member for fixing the optical system moving unit The optical system moving unit is fixed to the image reading apparatus main body by being inserted into holes formed in each of the optical system moving unit, the exterior cover, and the inner housing and attaching the fixing member to the optical system moving unit. In the image reading apparatus to
An elastic seal member for sealing a hole formed in the exterior cover is provided on the back surface of the exterior cover, and one end of the elastic seal member is attached to the back surface of the exterior cover. An image reading apparatus. When the fixing member is inserted into the hole formed in the exterior cover, the elastic seal member is pushed and bent by the fixing member, and the fixing member is inserted into the hole formed in the exterior cover. The image reading apparatus according to claim 1, wherein the elastic seal member comes in an allowable position.

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