JP4164445B2 - Optical mechanism holding structure - Google Patents

Description

The present invention relates to an optical mechanism holding structure for holding the lens unit of the image reading apparatus for reading using a photoelectric conversion element the image of the document.

  2. Description of the Related Art Conventionally, image reading apparatuses such as image reading apparatuses and image scanners mounted on copiers and facsimiles generally scan an original reading surface by a scanning optical system including an exposure lamp for illuminating an original and a folding mirror for guiding light. The reflected light obtained at the time of imaging is imaged on a photoelectric conversion element via a lens unit (a plurality of lenses held inside a lens barrel) and converted into an electrical signal by the photoelectric conversion element Has been.

  Examples of the lens unit holding structure provided in such an image reading apparatus include those shown in FIGS.

  FIG. 12 is a top view showing a lens unit holding structure of a conventional image reading apparatus.

  In FIG. 12, when the lens unit 450 is attached to the image reading apparatus, first, the lens unit 450 is placed in a square hole 452 disposed on the lens base 451 and the position is adjusted. After the position adjustment, the lens unit fixing member 453 made of an elastic member is moved in a direction perpendicular to the optical axis (from the front to the back in FIG. 12) so that the position of the lens in the lens unit 450 does not change due to vibration or impact. It is known that the lens unit 450 is held by being fixed to the lens base 451 with two screws 454 from the (direction), and the lens unit 450 is attached to the base frame 455 (for example, see Patent Document 1).

  13 is a top view showing a configuration of a main part of an image reading apparatus according to another conventional example, FIG. 14 is a cross-sectional view taken along the line II in FIG. 13, and FIG. It is sectional drawing which follows an II line.

13 to 15, the sub lens bases 516 and 517 are fixed in a state where both ends in the optical axis direction of the lens unit 515 are sandwiched between the two sub lens bases 516 and 517 provided with square holes, and this is fixed to the sub unit. After fixing the position on the main lens 520, the lens unit fixing member 519 and the subunit are fixed to the main body frame while holding the lens unit 515 with the lens unit fixing member 519. (See Patent Document 2).
Japanese Utility Model Publication No. 64-28058 JP-A-8-56282

  However, the structure for holding and holding the lens unit as shown in the above prior art has the following problems.

  (1) In Patent Document 1, since there is only a frictional force between the base frame 455 and the lens unit 450 that restricts the positional deviation of the lens unit 450 in the optical axis direction (left-right direction in FIG. 12), vibration or The position of the lens unit 450 changes due to the impact, and the lens tends to be out of focus and magnification. Further, if the pressing force of the lens unit fixing member 453 against the lens unit 450 is increased in order to increase the frictional force between the base frame 455 and the lens unit 450, the lens unit 450 is deformed.

  (2) Also, in Patent Document 1, after the lens focus adjustment, two screws 454 for fixing the lens unit fixing member 453 to the lens base 451 are tightened in order, so that the lens unit 450 by the lens unit fixing member 453 is used. The direction of the pressing force on the base frame 455 changes, and the lens unit 450 is pushed up from the square hole 452.

  (3) In Patent Document 2, since the lens unit 515 is sandwiched between the two sub-lens bases 516 and 517 and attached to the main body frame in order to prevent the positional deviation of the lens unit 515 in the optical axis direction, Becomes complicated, leading to deterioration in assembling and cost.

  (4) In Patent Document 2, since the lens unit fixing member 519 is shaped to embrace the lens unit 515, the lens unit 515 is adjusted in position or when the lens unit fixing member 519 is fixed to the main body frame. When the lens unit fixing member 519 has a stress, and the lens unit 515 moves in a direction to release the stress when subjected to vibration or impact, the focus and magnification of the lens change.

An object of the present invention is to prevent a phenomenon in which the imaging unit moves in the stress releasing direction of the fixing member due to vibration or impact, or a phenomenon in which the imaging unit is pushed up from the guide unit or unintentionally deformed. possible and the invention is to provide an optical system holding structure.

In order to achieve the above-described object, the present invention is provided with an imaging unit that guides reflected light from a document to a photoelectric conversion unit, and a guide unit that holds the imaging unit movably in parallel with the optical axis. A support member provided; a fixing member that fixes the imaging means to the support member; and a bracket that holds the fixing member and is attached to the imaging means and fixed to the support member. Slope portions are formed on both end sides in the optical axis direction of at least one of the outer portion of the imaging means and the fixing member, and the fixing member is made of an elastic material and attached to the bracket. and through the inclined surface portion is pressed in an oblique direction with respect to the optical axis of each of both end sides of the optical axis direction of the imaging means in a state, the bracket, along with consists inelastic material, said fixing member Mounting position Characterized in that it comprises positioning means for determining and regulating the rotation.

Further, the present invention provides an imaging unit that guides reflected light from a document to a photoelectric conversion unit, and a support member that is provided with a guide unit that holds the imaging unit movably in parallel with the optical axis; A fixing member that fixes the imaging means to the support member; and a bracket that holds the fixing member and is attached to the imaging means and fixed to the support member. And at least one of the fixing member and a slope portion is formed on one end side in the optical axis direction, and the imaging means is inclined with respect to the optical axis via the slope portion by the fixing member. Pressed and formed on the other end side in the optical axis direction of at least one of the outer portion of the imaging means and the fixing member, and the imaging means is pressed through the slope portion Abutment surface for receiving the reaction force in the optical axis direction The fixing member is made of an elastic material, and presses the imaging means in an oblique direction with respect to the optical axis via the slope portion in a state where the fixing member is attached to the bracket. It is made of an inelastic material, and further includes positioning means for determining a mounting position of the fixing member and restricting rotation.

Further, the present invention provides an imaging unit that guides reflected light from a document to a photoelectric conversion unit, and a support member that is provided with a guide unit that holds the imaging unit movably in parallel with the optical axis; A fixing member that fixes the imaging means to the support member; and a bracket that holds the fixing member, is attached to the imaging means and is fixed to the support member, and the fixing member is an elastic material. And has an arm portion that is inclined with respect to the optical axis and corresponds to both end portions in the optical axis direction of the imaging means, and is formed by the arm portion when attached to the bracket. The brackets are made of an inelastic material, and are provided with positioning means for determining an attachment position of the fixing member and restricting rotation.

According to the present invention, the fixing member is made of an elastic material , and presses the imaging means obliquely with respect to the optical axis at both ends in a state of being attached to the bracket, and the bracket is made of an inelastic material, Since the positioning means for determining the attachment position of the fixing member and restricting the rotation is provided, it is possible to prevent a phenomenon in which the fixing member rotates or is distorted in the rotation direction when the fixing member is attached to the bracket. In addition, the phenomenon that the direction of the pressing force exerted on the imaging means by the fixing member changes due to the deformation of the bracket, prevents the phenomenon that the imaging means is pushed up from the guide portion or causes unintentional deformation. Can do. In addition, the imaging means can be reliably fixed by the elasticity of the fixing member.

  Further, according to the present invention, the mounting position of the bracket with respect to the support member can be moved according to the position of the imaging means in the guide portion of the support member, so that the fixing member held by the bracket with respect to the imaging means can be moved. Since the position can be kept constant, the pressing force exerted on the imaging means by the fixing member can be kept constant regardless of the adjustment position of the imaging means.

  Further, according to the present invention, the imaging means includes slope portions that receive a pressing force in an oblique direction with respect to the optical axis from the fixing member on both end sides in the optical axis direction, and the bracket is slightly between the both end portions. Since the fixing member has a pressing portion corresponding to the inclined surface portion of the imaging means, the imaging means and the bracket are fitted when adjusting the position of the imaging means. Accordingly, when only one of the image forming means or the bracket is moved, the other moves following the movement. Therefore, it is possible to provide an optical mechanism with a simple structure and good assembling workability. It becomes possible.

According to the invention, the imaging means includes a slope portion that receives a pressing force obliquely with respect to the optical axis from the fixing member on one end side in the optical axis direction, and the other end in the optical axis direction. the parts side from the fixed member parallel to the optical axis with a vertical surface portion receives a pressing force, the fixing member has Ru with the abutment portion corresponding to the pressing pressure part perpendicular surface portion that corresponds to the inclined surface portion of the imaging means Therefore, in addition to the operation in which the fixing member is inclined with respect to the imaging means, the frictional force acting between the imaging means and the support member is increased, so that the imaging means can be fixed more firmly. .

According to the invention, the fixing member includes an arm portion that presses both ends in the optical axis direction of the imaging means downward, and the arm portion is located immediately above a portion where the imaging means contacts the support member. Therefore, even if the force with which the fixing member presses the imaging unit downward is increased, the imaging unit is not deformed, and the imaging unit is firmly fixed without impairing the optical performance of the imaging unit. It becomes possible.

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

[First Embodiment]
1 is a perspective view showing the configuration of the main part of the image reading apparatus according to the first embodiment of the present invention, FIG. 2 is a top view showing the configuration of the main part of the image reading apparatus, and FIG. FIG. 4 is a diagram illustrating a slope portion and a fitting portion of the lens unit of the reading device, and FIG. 4 is a diagram illustrating a fitting state of the lens unit and the mounting bracket.

  1 to 4, an image reading apparatus includes a lens unit 101 (imaging unit), a CCD substrate unit 102, a base frame 103 (support member), a guide unit 104, a lens unit fixing member (hereinafter abbreviated as a lens fixing member). ) 105 (fixing member) and a lens fixing member mounting bracket (hereinafter abbreviated as mounting bracket) 106. In the figure, 107 and 108 are screws, and 109 is a positioning pin (positioning means).

  The lens unit 101 forms an image of reflected light from a document illuminated by a light source (not shown) on a CCD (not shown) of the CCD substrate unit 102, and houses a lens. On both ends of the lens unit 101 in the optical axis direction, slope portions 110 that receive a pressing force in an oblique direction with respect to the optical axis from the lens fixing member 105 are disposed, and a mounting bracket 106 is provided between both ends. A fitting portion 111 that can be fitted with a slight gap is provided (see FIG. 3). The CCD substrate unit 102 is fixed to the end of the base frame 103, and a CCD that photoelectrically converts light imaged by the lens unit 101 into an electrical signal is mounted.

  The base frame (lens stay) 103 is a member that holds the lens unit 101 and the CCD substrate unit 102, and a guide portion 104 is disposed at a substantially central portion of the base frame 103. The guide unit 104 is a square hole that holds the lens unit 101 so that the lens unit 101 can move in the optical axis direction and does not move in a direction orthogonal to the optical axis direction, and the longitudinal dimension is larger than the optical axis direction dimension of the lens unit 101. The size in the width direction is set to be smaller than the diameters at both ends of the lens unit 101.

The lens fixing member 105 is made of an elastic material such as a spring material, for example, and is a member that regulates movement in the optical axis direction while pressing the lens unit 101 against the base frame 103. It is fixed to the mounting bracket 106 by a screw 107 through a screw hole formed in the above. At both ends of the lens fixing member 105, a pressing portion 105a having a shape corresponding to the inclined surface portion 110 of the lens unit 101 is formed (see FIG. 4). Further, the lens fixing member 105 is formed with a through hole through which two positioning pins 109 described later of the mounting bracket 106 pass.

  The mounting bracket 106 is made of an inelastic material, and is a member that holds the lens fixing member 105. The mounting bracket 106 has screw holes formed in two mounting portions (screw mounting portions) with respect to the base frame 103 of the mounting bracket 106. And is fixed to the base frame 103 by screws 108. Positioning pins 109 for determining the position of the lens fixing member 105 and restricting the rotation of the lens fixing member 105 are provided at two positions on the top of the mounting bracket 106. The attachment position of the attachment bracket 106 to the base frame 103 can be moved according to the position of the lens unit 101 in the guide portion 104.

  As shown in FIG. 3, slope portions 110 are formed along the circumferential direction at both ends of the lens unit 101 in the optical axis direction, and mounting brackets 106 are provided between the slope portion forming portions on both sides of the lens unit 101. The fitting part 111 which can fit is formed along the circumferential direction. In the figure, L is the center line of the lens unit 101 in the optical axis direction.

  Further, as shown in FIG. 4, in a state where the lens unit 101 is fixed by the lens fixing member 105 held by the mounting bracket 106, the slope portion 110 of the lens unit 101 is disposed on the lens fixing member 105. The pressing portion 105a having a shape corresponding to the inclined surface portion 110 is pressed, and the mounting bracket 106 is fitted into the fitting portion 111 of the lens unit 101 with the side surface and the fitting portion 111 with a very small gap. Yes.

  In the image reading apparatus having the above configuration, when the position of the lens unit 101 is fixed and the positions of the lens unit 101 and the CCD are adjusted, first, the lens unit 101 is attached to the guide unit 104 provided on the base frame 103. After mounting, the mounting bracket 106 is attached to the lens unit 101 so that the side surface of the mounting bracket 106 is fitted to the fitting portion 111 of the lens unit 106. Next, by moving the mounting bracket 106, the lens unit 101 is moved in parallel with the optical axis direction along the guide portion 104, the distance between the lens unit 101 and the document surface (not shown), the lens unit 101, The distance between the CCD substrate unit 102 and the CCD (not shown) is roughly adjusted.

  When the position of the lens unit 101 is determined, the lens fixing member 105 is attached to the mounting bracket 106 via the positioning pin 109, and then the screws 108 (two places) for fixing the mounting bracket 106 to the base frame 103, and the lens fixing member 105. The lens unit 101 is fixed to the base frame 103 by sequentially tightening screws 107 for fixing the lens unit 101 to the mounting bracket 106. Thereafter, the CCD substrate unit 102 is moved to finely adjust the focus and magnification of the lens of the lens unit 101.

  In a state where the lens unit 101 is fixed to the base frame 103 via the lens fixing member 105 held by the mounting bracket 106, the lens fixing member 105 has two inclined portions 110 of the lens unit 101 formed by the pressing portion 105a. Therefore, the movement of the lens unit 101 in the optical axis direction is also restricted while pressing the lens unit 101 against the base frame 103. Since the lens fixing member 105 has its substantially central portion fixed to the mounting bracket 106 by a screw 107, it is possible to make the pressing force to the inclined surface portions 110 provided at both ends in the optical axis direction of the lens unit 101 substantially equal. It is.

  Further, since the mounting bracket 106 is fitted in the fitting portion 111 of the lens unit 101 with a very small gap, there is almost no time lag between the movement of the mounting bracket 106 and the movement of the lens unit 101, and the mounting bracket. It is possible to perform the same adjustment as moving the lens unit 101 directly by moving the lens unit 106, and to keep the positional relationship between the two inclined portions 110 of the lens unit 101 and the lens fixing member 105 substantially constant. it can. Accordingly, the position of the lens unit 101 can be easily adjusted, and the pressure received by the inclined surface portions 110 provided at both ends in the optical axis direction of the lens unit 101 from the lens fixing member 105 can be kept substantially equal.

  In addition, since the mounting bracket 106 is provided with two positioning pins 109 penetrating through the through holes of the lens fixing member 105, after mounting the lens fixing member 105 to the mounting bracket 106 via the positioning pins 109, When the lens fixing member 105 is fixed to the mounting bracket 106 with the screw 107, a phenomenon that the lens fixing member 105 is rotated by the tightening torque of the screw 107 or distorted in the rotation direction can be prevented.

  As described above, according to the present embodiment, the lens unit 101 can be reliably fixed to the base frame 103 without being deformed with the simple configuration described above, and the lens fixing member 105 can be caused by vibration or impact. It is possible to prevent the lens unit 101 from moving in the stress releasing direction. Further, when the lens fixing member 105 is fastened to the mounting bracket 106 with a screw, the direction of the pressing force that the lens fixing member 105 exerts on the lens unit 101 changes, and the lens unit 101 is pushed up from the guide portion 104 on the base frame 103. It is possible to prevent a phenomenon that causes unintended deformation.

[Second Embodiment]
FIG. 5 is a perspective view showing the configuration of the main part of the image reading apparatus according to the second embodiment of the present invention, FIG. 6 is a top view showing the configuration of the main part of the image reading apparatus, and FIG. FIG. 8 is a diagram illustrating a slope portion and a vertical surface portion of the lens unit of the reading device, and FIG. 8 is a diagram illustrating a pressing state of the lens fixing member against the lens unit.

  5 to 8, the image reading apparatus includes a lens unit 201 (imaging unit), a CCD substrate unit 202, a base frame 203 (support member), a guide unit 204, a lens fixing member 205 (fixing member), and a mounting bracket 206. It has. In the figure, 207 and 208 are screws, and 209 is a positioning pin (positioning means).

  In this embodiment, in contrast to the first embodiment described above, instead of providing two inclined portions on the lens unit 101, the lens unit 201 has one inclined portion 210 and one vertical surface portion (projection). The contact surface portion 211 is provided, the fitting portion is eliminated, and the arm portion 205a is disposed on the lens fixing member 205. Since the other elements of the present embodiment are the same as the corresponding ones of the first embodiment described above, description thereof will be omitted.

  As shown in FIG. 7, an inclined surface 210 is formed along the circumferential direction at one end of the lens unit 201 in the optical axis direction, and on the inner side of the other end of the lens unit 201 in the optical axis direction. The vertical surface portion (abutting surface portion) 211 is formed along the circumferential direction. In the figure, L is the center line of the lens unit 201 in the optical axis direction.

  Further, as shown in FIG. 8, in a state where the lens fixing member 205 is fixed to the upper portion of the mounting bracket 206 (not shown in FIG. 8) attached to the lens unit 201, the inner portion of the lens unit 201 is attached to the lens. The arm portion 205a of the fixing member 205 presses, and the inclined portion 210 of the lens unit 201 is pressed by the pressing portion 205b having a shape corresponding to the inclined portion 210 disposed at one end of the lens fixing member 205, and the lens unit. The abutting portion 205 c as the other end portion of the lens fixing member 205 is pressed against the vertical surface portion 211 of 201.

  In the image reading apparatus having the above configuration, when fixing the position of the lens unit 201 and adjusting the positions of the lens unit 201 and the CCD, first, the lens unit 201 is attached to the guide unit 204 provided in the base frame 203. The lens unit 201 is moved in parallel with the optical axis direction along the guide unit 204, the distance between the lens unit 201 and the document surface (not shown), the CCD of the lens unit 201 and the CCD substrate unit 202, and Adjust the distance between.

  Next, the mounting bracket 206 is attached to the lens unit 201, and two mounting portions (screw mounting portions) of the mounting bracket 206 are mounted on the base frame 203, and the mounting bracket 206 is completely fixed to the base frame 203. Tighten the screw 208 to such an extent that it does not. Further, the lens fixing member 205 is attached to the mounting bracket 206 by inserting the positioning pin 209 of the mounting bracket 206 into the through hole of the lens fixing member 205.

  When the screw 207 is tightened so that the lens fixing member 205 fits between the slope portion 210 and the vertical surface portion 211 of the lens unit 201, the arm portion 205a of the lens fixing member 205 presses the lens unit 201 against the lens fixing member 205. The portion 205b presses the slope portion 210 of the lens unit 201 and the abutting portion 205c of the lens fixing member 205 presses the vertical surface portion 211 of the lens unit 201 in the direction shown in FIG. And movement in the optical axis direction are restricted. Thereafter, the screw 208 is completely tightened to fix the mounting bracket 206 to the base frame 203, and the CCD substrate unit 202 is moved to finely adjust the focus and magnification of the lens of the lens unit 101.

  When the lens fixing member 205 is attached to the attachment bracket 206, even if the position of the attachment bracket 206 is slightly deviated from the lens unit 201, the reaction is received by the pressing portion 205 b of the lens fixing member 205 from the slope portion 210 of the lens unit 201. Since the abutting portion 205c of the lens fixing member 205 moves until it abuts against the vertical surface portion 211 of the lens unit 201, the lens unit 201 can be fixed to the base frame 203 without causing play.

  Even if the arm portion 205 a of the lens fixing member 205 is not provided, the effect of fixing the lens unit 201 to the base frame 203 is not impaired, but the pressing portion 205 b of the lens fixing member 205 is against the inclined surface portion 210 of the lens unit 201. Since the lens unit 201 may be tilted, it is desirable to provide it.

  Further, since the mounting bracket 206 is provided with two positioning pins 209 that pass through the through holes of the lens fixing member 205, when the lens fixing member 205 is fixed to the mounting bracket 206 with the screws 207, It is possible to prevent a phenomenon in which the lens fixing member 205 is rotated by the tightening torque or is distorted in the rotation direction.

  As described above, according to the present embodiment, the lens unit 201 can be reliably fixed to the base frame 203 without being deformed with the above-described simple configuration, and the lens fixing member 205 is caused by vibration or impact. It is possible to prevent the lens unit 201 from moving in the stress release direction. Further, when the lens fixing member 205 is tightened to the mounting bracket 206 with a screw, the direction of the pressing force that the lens fixing member 205 exerts on the lens unit 201 changes, and the lens unit 201 is pushed up from the guide portion 204 on the base frame 203. It is possible to prevent a phenomenon that causes unintended deformation.

[Third Embodiment]
FIG. 9 is a perspective view showing the configuration of the main part of the image reading apparatus according to the third embodiment of the present invention, FIG. 10 is a top view showing the configuration of the main part of the image reading apparatus, and FIG. FIG. 11 illustrates a state in which the lens unit of the reading device is held on the base frame, and is a cross-sectional view taken along the line AA in FIG. 10.

  9 to 11, the image reading apparatus includes a lens unit 301 (imaging unit), a CCD substrate unit 302, a base frame 303 (support member), a guide unit 304, a lens fixing member 305 (fixing member), and a mounting bracket 306. It has. In the figure, 307 and 308 are screws, and 309 is a positioning pin (positioning means).

  In the present embodiment, an arm portion 305a for pressing the lens unit 301 downward is provided on the lens fixing member 305, and the base of the lens unit 301 is provided by the arm portion 305a, as compared with the first embodiment described above. The difference is that the portion directly above the placement portion with respect to the frame 303 is pressed. Since the other elements of the present embodiment are the same as the corresponding ones of the first embodiment described above, description thereof will be omitted.

  As shown in FIGS. 9 to 11, at the four corners of the lens fixing member 305, there are arm portions 305 a for pressing the lens unit 301 downward with respect to the surface of the main body of the lens fixing member 305. Each is provided in a state inclined at a predetermined angle. The inclination angle of the arm portion 305a with respect to the main body portion of the lens fixing member 305 is set to an angle that presses both ends in the optical axis direction of the lens unit 301 when the lens fixing member 305 is fixed to the mounting bracket 306.

  In the image reading apparatus having the above configuration, the fixing of the position of the lens unit 301 and the adjustment of the positions of the lens unit 301 and the CCD are performed in the same manner as described in the first embodiment. As shown in FIG. 11, the arm portion 305a of the lens fixing member 305 presses both end portions in the optical axis direction of the lens unit 301 downward, so that only the slope portion of the lens unit 101 in the first embodiment is pressed. Compared with the structure which performs, the frictional force between the lens unit 301 and the base frame 303 increases, and the effect which fixes the lens unit 301 to the base frame 303 further increases.

  Further, the arm portion 305a of the lens fixing member 305 presses near the lens unit receiving portion 307 (the portion where the lens unit 301 contacts the base frame 303) supporting the lens unit 301 in the base frame 303. The phenomenon in which the lens unit 301 is deformed by the pressure of the fixing member 305 and the optical performance is impaired can be prevented.

  As described above, according to the present embodiment, the lens unit 301 can be securely fixed to the base frame 303 without being deformed with the above-described simple configuration, and the lens fixing member 305 is caused by vibration or impact. It is possible to prevent the lens unit 301 from moving in the stress release direction. Further, when the lens fixing member 305 is fastened to the mounting bracket 306 with a screw, the direction of the pressing force that the lens fixing member 305 exerts on the lens unit 301 changes, and the lens unit 301 is pushed up from the guide portion 304 on the base frame 303. It is possible to prevent a phenomenon that causes unintended deformation.

[Other embodiments]
In the first embodiment, the inclined surface portion 110 is disposed on the lens unit 101 and the pressing portion 105 a having a shape corresponding to the inclined surface portion 110 is disposed on the lens fixing member 105. At least one inclined surface portion (for receiving a pressing force) for pressing the lens in an oblique direction with respect to the optical axis may be disposed on either the lens unit 101 or the lens fixing member 105.

  In the second embodiment, the inclined surface portion 210 is disposed in the lens unit 201 and the pressing portion 205b having a shape corresponding to the inclined surface portion 210 is disposed in the lens fixing member 205. At least one inclined surface portion (for receiving a pressing force) for pressing the lens in an oblique direction with respect to the optical axis may be disposed on either the lens unit 201 or the lens fixing member 205.

  In the first to third embodiments, the image reading apparatus has been described. However, the present invention is not limited to the application of only the image reading apparatus, and an image of a copying machine, a multifunction machine, or the like equipped with the image reading apparatus of the present invention. The present invention can also be applied to a forming apparatus and a facsimile equipped with the image reading apparatus of the present invention.

1 is a perspective view showing a configuration of a main part of an image reading apparatus according to a first embodiment of the present invention. 2 is a top view illustrating a configuration of a main part of the image reading apparatus. FIG. It is a figure which shows the slope part and fitting part of the lens unit of an image reading apparatus. It is a figure which shows the fitting state of a lens unit and a mounting bracket. It is a perspective view which shows the structure of the principal part of the image reading apparatus which concerns on the 2nd Embodiment of this invention. 2 is a top view illustrating a configuration of a main part of the image reading apparatus. FIG. It is a figure which shows the slope part and vertical surface part of the lens unit of an image reading apparatus. It is a figure which shows the press state of the lens fixing member with respect to a lens unit. It is a perspective view which shows the structure of the principal part of the image reading apparatus which concerns on the 3rd Embodiment of this invention. 2 is a top view illustrating a configuration of a main part of the image reading apparatus. FIG. FIG. 11 illustrates a state in which the lens unit of the image reading apparatus is held on the base frame, and is a cross-sectional view taken along the line AA in FIG. 10. It is a top view which shows the holding structure of the lens unit of the image reading apparatus which concerns on a prior art example. It is a top view which shows the structure of the principal part of the image reading apparatus which concerns on another prior art example. It is sectional drawing which follows the arrow I-I line | wire in FIG. It is sectional drawing which follows the arrow II-II line in FIG.

Explanation of symbols

101, 201, 301 Lens unit 102, 202, 302 CCD substrate unit 103, 203, 303 Base frame 104, 204, 304 Guide part 105, 205, 305 Lens fixing member 105a Press part 106, 206, 306 Mounting bracket 110 Slope part 111 fitting part 205a arm part 205b pressing part 205c abutting part 210 slope part 211 vertical surface part 305a arm part 307 lens unit receiving part

Claims (9)

Imaging means for guiding the reflected light from the document to the photoelectric conversion means, a support member provided with a guide portion for holding the imaging means movably in parallel with the optical axis, and the imaging means A fixing member that is fixed to the support member, and a bracket that holds the fixing member and is attached to the imaging unit and is fixed to the support member.
Forming slope portions on both end sides in the optical axis direction of at least one of the outer portion of the imaging means and the fixing member;
The fixing member is made of an elastic material, and presses both ends of the image forming means in the optical axis direction obliquely with respect to the optical axis via the inclined surface when attached to the bracket. And
The bracket is made of an inelastic material and includes positioning means for determining a mounting position of the fixing member and restricting rotation.   Imaging means for guiding the reflected light from the document to the photoelectric conversion means, a support member provided with a guide portion for holding the imaging means movably in parallel with the optical axis, and the imaging means A fixing member that is fixed to the support member, and a bracket that holds the fixing member and is attached to the imaging unit and is fixed to the support member.
  Forming an inclined surface on one end side in the optical axis direction of at least one of the outer portion of the imaging means and the fixing member;
The imaging means is pressed in an oblique direction with respect to the optical axis by the fixing member via the inclined surface, and at least one of the outer portion of the imaging means and the fixing member is the other in the optical axis direction. An abutting surface portion is formed on the end portion side, for receiving a reaction force in the optical axis direction when the imaging means is pressed through the slope portion,
  The fixing member is made of an elastic material, and presses the imaging means in an oblique direction with respect to the optical axis via the slope portion in a state attached to the bracket,
  The bracket is made of an inelastic material and includes positioning means for determining a mounting position of the fixing member and restricting rotation. 3. The optical mechanism holding structure according to claim 1, wherein an attachment position of the bracket with respect to the support member is movable according to a position of the imaging unit in the guide portion of the support member. It said imaging means, the co-when provided with the inclined surface portion for receiving a pressing force in an oblique direction with respect to the optical axis from the fixed member to the both ends of the optical axis direction,
The optical mechanism holding structure according to claim 1, wherein the fixing member includes a pressing portion corresponding to the slope portion of the imaging unit. It said imaging means includes an optical mechanism holding structure according to claim 4, wherein the bracket is characterized in that to obtain Bei mateable fitting portion with slight clearance between the ends of the optical axis direction, Said imaging means is provided with a said inclined surface portion for receiving a pressing force in an oblique direction with respect to the optical axis from the fixed member on one end side in the optical axis direction, the fixed to the other end side of the optical axis A vertical surface portion that receives a pressing force parallel to the optical axis from the member is provided as the abutting surface portion ,
The fixing member, optical mechanism holding structure according to claim 2, wherein the benzalkonium provided with abutting portion corresponding to the vertical surface portion and the slant pressing portion corresponding to the inclined surface portion of the imaging means.   The optical mechanism holding structure according to claim 6, wherein the fixing unit further includes an arm portion that presses an inner portion of the imaging unit in the optical axis direction downward.   Imaging means for guiding the reflected light from the document to the photoelectric conversion means, a support member provided with a guide portion for holding the imaging means movably in parallel with the optical axis, and the imaging means A fixing member that is fixed to the support member, and a bracket that holds the fixing member and is attached to the imaging unit and is fixed to the support member.
  The fixing member is made of an elastic material, corresponds to both end portions of the imaging means in the optical axis direction, has arm portions inclined with respect to the optical axis, and is attached to the bracket. Pressing both ends of the imaging means downward with the arms respectively,
  The bracket is made of an inelastic material and includes positioning means for determining a mounting position of the fixing member and restricting rotation.   The optical mechanism holding structure according to claim 8, wherein the arm portion of the fixing member presses a portion immediately above a portion where the imaging unit contacts the support member.

Images