JP2006135598A - Fixing structure and lens block with the, image read unit with the lens block, image forming apparatus with the image read unit, and intermediate holding member suitable to the fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens block having: a fixing structure improving precision of positioning of a package and an intermediate holding member; an image read unit; an image forming apparatus; and an intermediate holding member. <P>SOLUTION: A fitting portion 47 of a base member 30 and a 1st fixation portion 331 of the intermediate holding member 33 are fixed with a photosetting 1st adhesive 62. A fitting portion 48 of a package 41 and a 2nd fixation portion 332 of the intermediate holding member 33 are fixed with the photosetting 1st adhesive 62. A base 43 of the package 41 and a window member 50 are fixed with a 2nd adhesive 61. A recessed portion 33a is formed in the 2nd fixation portion 332. The recessed portion 33a is recessed from the surface 332a of the 2nd fixation portion 332 which faces the fitting portion 48, and a gap S is formed so that three points of a projection portion 61a of the 2nd adhesive 61, the 2nd fixation portion 332 of the intermediate holding member 33, and the 1st adhesive 62 do not come into contact with one another. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing structure between a package for accommodating a photoelectric conversion element and an intermediate holding member in an image forming apparatus for reading an optical image using a line type photoelectric conversion element such as a copying machine, an image scanner, and a facsimile, and a lens having the same. The present invention relates to a block, an image reading unit having the lens block, an image forming apparatus having the image reading unit, and an intermediate holding member optimal for the fixing structure.

  2. Description of the Related Art Conventionally, an image reading unit (see, for example, Patent Document 1) used in a copying machine, a facsimile, a scanner device, and the like includes a base member, an imaging lens system attached to the base member, a line type photoelectric conversion element, An image sensor having a package for housing the line-type photoelectric conversion element and attached to a base member. The image reading unit moves the illumination light source of the document in the sub-scanning direction, passes the reflected light from the document through the imaging lens system composed of two or more lenses, and reduces the image on the line photoelectric conversion element. The image forming light beam imaged on the photoelectric conversion element is photoelectrically converted and output as an image reading signal.

  A package that accommodates the above-described line-type photoelectric conversion element (hereinafter simply referred to as a package) usually has the following structure. First, a plurality of ceramic substrates on which various wiring patterns are formed are laminated, and sintering is repeated to form a desired shape. A line type photoelectric conversion element is fixed in the package, and an opening of the package is covered with sealing glass to seal the line type photoelectric conversion element. The lead frame fixed to the package and the line type photoelectric conversion element are electrically connected by wire bonding.

  However, the above-described multilayer package is formed by sintering a plurality of ceramic substrates many times, and therefore, the process is time consuming and expensive. In recent years, therefore, a sardip-type package (for example, see Patent Document 2) having a low manufacturing cost has been widely used.

  As shown in FIG. 6, the Sardip type package is sealed with a glass-based adhesive 161 between a ceramic base 143 to which the line-type photoelectric conversion element 142 is fixed and a window frame 144. An opening of the wind frame 144 is covered with a sealing glass 145. Although not shown, the lead frame fixed to the package 141 and the line type photoelectric conversion element 142 are electrically connected by wire bonding.

The package 141 and the intermediate holding member 133 are bonded by an adhesive 162, and the package 141 is fixed to a base member of an image reading unit (not shown) via the intermediate holding member 133.
JP 2001-313779 A JP 2003-31783 A

  However, the above-described surdip package 141 has the following problems. That is, as shown in FIG. 6, in the conventional package 141, the space between the base 143 and the window frame 144 is sealed with the adhesive 161. However, if the amount of the adhesive 161 is excessive, the base 143 and the window 141 are sealed. Since the protrusions 161a protrude from between the frames 144, there is a problem that the accuracy of adhesion between the package 141 and the intermediate holding member 133 may be deteriorated.

  Specifically, as shown in FIG. 6, when the protruding portion 161 a of the adhesive 161 protrudes between the fixing surface of the intermediate holding member 133 and the mounting surface of the package 141, the positions of the members to be bonded are As shown by the dotted line in FIG. 7, both positions shift due to curing shrinkage of the adhesive 162. In order to obtain the image quality required for the image reading unit, the lens and the package need to be positioned with high accuracy. However, such misalignment has been a fatal problem for the image reading unit.

  Therefore, in order to solve the above-described problems, the present invention provides a fixing structure that improves the positioning accuracy between the package and the intermediate holding member, a lens block having the fixing structure, an image reading unit having the lens block, and the image reading It is an object of the present invention to provide an image forming apparatus having a unit and an intermediate holding member optimum for the fixing structure.

  In order to achieve the above object, the fixing structure according to claim 1 includes a package that accommodates a photoelectric conversion element, and an intermediate holding member that is fixed to both the package and the base member with a first adhesive. In the fixing structure including the first member and the second member that are fixed to each other with a second adhesive, the second adhesive and the intermediate holding The package and the intermediate holding member are bonded and fixed to each other with the first adhesive so as to restrict contact with the member.

  The fixing structure according to claim 2 is the fixing structure according to claim 1, wherein a recess facing the second adhesive is provided on a surface of the intermediate holding member facing the package. In addition, the first adhesive is characterized in that the intermediate holding member and the package are bonded so that a gap is formed in the recess.

  The fixing structure according to claim 3 is the fixing structure according to claim 1, wherein the second adhesive is recessed at a position facing the package from the outer surface facing the intermediate holding member of the package. A second recess is provided, and the first adhesive bonds the intermediate holding member and the package so that a gap is formed in the second recess. Yes.

  The fixing structure according to claim 4 is the fixing structure according to any one of claims 1 to 3, wherein the first member is a base to which a photoelectric conversion element is attached, and The second member is a window member that allows a reflection image from a document to pass therethrough and restricts the passage of outside air.

  According to a fifth aspect of the present invention, there is provided the fixing structure according to any one of the first to fourth aspects, wherein the first adhesive is a photo-curing type that cures when irradiated with ultraviolet rays. The intermediate holding member is fixed with an adhesive, and the intermediate holding member is made of a material that transmits ultraviolet rays.

  A lens block according to claim 6 is a lens block that reads a reflected image from a document by a photoelectric conversion element, and is provided with the fixing structure according to any one of claims 1 to 5. It is a feature.

  The image reading unit according to claim 7 is an image reading unit that irradiates light on a document and photoelectrically converts a reflected image from the document by a photoelectric conversion element, and includes the lens block according to claim 6. It is characterized by being.

  An image forming apparatus according to an eighth aspect is provided with the image reading unit according to the seventh aspect.

  The intermediate holding member according to claim 9 is an intermediate holding member that is bonded and fixed to both the base member that holds the lens and the package that houses the photoelectric conversion element, and the base and the window member that constitute the package are mutually connected. A concave portion is provided on the surface facing the second adhesive so as not to contact the second adhesive to be bonded.

  The intermediate holding member according to claim 10 is a photo-curing which is made of a material that transmits ultraviolet rays in the intermediate holding member according to claim 9, and is cured when the base member and the package are irradiated with ultraviolet rays. It is characterized by being bonded and fixed with a mold adhesive.

  In the fixing structure according to claim 1, the package and the intermediate holding member are bonded and fixed to each other with the first adhesive so as to restrict the contact between the second adhesive and the intermediate holding member. Therefore, there is no possibility that the second adhesive interferes with the intermediate holding member. Therefore, there is little possibility that the position of the intermediate holding member with respect to the package is shifted due to the second adhesive interfering with the intermediate holding member. As a result, the positioning accuracy of the photoelectric conversion element with respect to the imaging lens system can be ensured, and a fixed structure capable of capturing an image with high accuracy can be obtained.

  In the fixing structure according to claim 2, a recess facing the second adhesive is provided on the surface facing the package of the intermediate holding member, and the first adhesive has a gap in the recess. As described above, since the intermediate holding member and the package are bonded, there is no possibility that the second adhesive interferes with the intermediate holding member. Therefore, there is little possibility that the position of the intermediate holding member with respect to the package is shifted due to the second adhesive interfering with the intermediate holding member. As a result, the positioning accuracy of the photoelectric conversion element with respect to the imaging lens system can be ensured, and a fixed structure capable of capturing an image with high accuracy can be obtained.

  The fixing structure according to claim 3 is provided with a second recessed portion that is recessed from the outer surface facing the intermediate holding member of the package at a position facing the package of the second adhesive. Since the adhesive bonds the intermediate holding member and the package so that a gap is generated in the second recess, there is no possibility that the second adhesive interferes with the intermediate holding member. Therefore, there is little possibility that the position of the intermediate holding member with respect to the package is shifted due to the second adhesive interfering with the intermediate holding member. As a result, the positioning accuracy of the photoelectric conversion element with respect to the imaging lens system can be ensured, and a fixed structure that can capture images with high accuracy is obtained.

  In the fixing structure according to claim 4, the first member is a base to which a photoelectric conversion element is attached, and the second member allows a reflection image from the original to pass therethrough and allows the outside air to pass therethrough. It is a window member that regulates what to do. Thus, the package can be manufactured at low cost by separately making the first member and the second member. Furthermore, by using this package in the present invention, an inexpensive and more accurate lens block can be obtained without interference between the second adhesive and the intermediate holding member.

  The fixing structure according to claim 5 is configured such that the first adhesive is fixed with a photo-curing adhesive that cures when irradiated with ultraviolet rays, and the intermediate holding member is made of a material that transmits ultraviolet rays. Therefore, it is possible to irradiate the photo-curing adhesive with ultraviolet rays through the intermediate holding member, and simultaneously irradiate the entire area with the ultraviolet rays, shortening the time until the adhesive is cured and improving productivity. Can be improved.

  Since the lens block according to the sixth aspect includes the fixing structure according to any one of the first to fifth aspects, a lens block capable of capturing an image with high accuracy is obtained.

  Since the image reading unit according to the seventh aspect includes the lens block according to the sixth aspect, an image reading unit capable of forming a high-quality read image is obtained.

  Since the image forming apparatus according to the eighth aspect includes the image reading unit according to the seventh aspect, an image forming apparatus capable of forming a high-quality image is obtained.

  The intermediate holding member according to claim 9 is provided with a concave portion on a surface facing the second adhesive so as not to contact the second adhesive that bonds the base and the window member constituting the package to each other. Therefore, there is no possibility that the second adhesive interferes with the intermediate holding member. Therefore, there is little possibility that the position of the intermediate holding member with respect to the package is shifted due to the second adhesive interfering with the intermediate holding member. Thereby, the intermediate holding member which comprises the fixed structure which can ensure the positioning accuracy of the photoelectric conversion element with respect to the imaging lens system and can capture images with high accuracy is obtained.

  The intermediate holding member according to claim 10 is made of a material that transmits ultraviolet rays, and is bonded and fixed to the base member and the package with a photo-curing adhesive that is cured when irradiated with ultraviolet rays. It is possible to irradiate the photocurable adhesive with ultraviolet rays through the member, and simultaneously irradiate the entire area with the ultraviolet rays, thereby shortening the time until the adhesive is cured and improving productivity. .

(First embodiment)
Hereinafter, a lens block, an image reading unit, an image forming apparatus, and an intermediate holding member according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the image forming apparatus 1 includes an apparatus main body 2, an automatic document feeder 3, an image reading unit 4, a paper feeding unit 5, and a writing unit 6.

  The apparatus main body 2 is formed in a box shape, for example, and is installed on a floor or the like. The apparatus main body 2 accommodates an image reading unit 4, a paper feeding unit 5, and a writing unit 6.

  The automatic document feeder 3 is attached to the upper part of the apparatus body 2. The automatic document feeder 3 includes a document placing plate 7 and a belt feeder 8. The document placing plate 7 is formed in a flat plate shape, is attached to the upper part of the apparatus main body 2, and a plurality of documents 9 are placed on the surface. The belt feeding device 8 feeds the originals 9 on the original placing plate 7 one by one onto a contact glass 10 which will be described later, and the original 9 on which a reflection image has been read by a lens block 16 which will be described later from the contact glass 10. Drain out of the main body 2.

  The image reading unit 4 is provided above the apparatus main body 2 and below the automatic document feeder 3 described above, and includes a contact glass 10 on which the document 9 is placed and an optical scanning system 11. The contact glass 10 is attached to the upper surface of the apparatus main body 2 with both surfaces parallel to the horizontal direction. The optical scanning system 11 includes an exposure lamp 12, a first mirror 13, a second mirror 14, a third mirror 15, a lens block 16, and the like. The optical scanning system 11 irradiates light on the document 9, and a reflected image from the document 9 is described later. The line type photoelectric conversion element 42 performs photoelectric conversion.

  The exposure lamp 12 irradiates the document 9 on the contact glass 10 with light. The first mirror 13, the second mirror 14, and the third mirror 15 guide the reflected image from the document 9 to the lens block 16. The exposure lamp 12 and the first mirror 13 are fixed on a first carriage (not shown), and the second mirror 14 and the third mirror 15 are fixed on a second carriage (not shown). When reading the document 9, the first carriage and the second carriage are mechanically moved at a relative speed of 2: 1 so that the optical path length does not change. The aforementioned first carriage and second carriage of the optical scanning system 11 are moved by a scanner drive motor (not shown).

  The lens block 16 includes an imaging lens system 31, an image sensor 32, and the like. The detailed configuration of the lens block 16 will be described later. The lens block 16 reads (photoelectrically converts) the reflection image of the document 9 described above by the image sensor 32 and converts the optical signal into an electrical signal for processing. The converted electrical signal is output toward an image processing unit (not shown). When the imaging lens system 31 and the image sensor 32 are moved in the left-right direction (horizontal direction) in FIG. 1, the image magnification can be changed. That is, the positions of the imaging lens system 31 and the image sensor 32 in the left-right direction in FIG. 1 are set corresponding to the specified magnification.

  The paper feed unit 5 includes a plurality of transfer paper storage portions 19 provided at the lower part of the apparatus main body 2 and a transfer paper feed unit 20. The transfer paper storage unit 19 stores a plurality of transfer papers 21. The transfer paper feed unit 20 sends the transfer paper 21 in the transfer paper storage unit 19 between registration rollers 25 described later. The paper feeding unit 5 feeds the transfer paper 21 in the transfer paper storage unit 19 one by one toward the registration rollers 25, that is, toward the writing unit 6.

  The writing unit 6 includes a laser output unit 22, an imaging lens 23, a mirror 24, a registration roller 25, a photosensitive drum 26, a developing device 27, a transfer member 28, and a fixing device 29. Yes.

  Inside the laser output unit 22, a laser diode that is a laser light source and a polygon mirror that rotates at a constant speed by a motor are provided. Laser light emitted from the laser output unit 22 is deflected by the polygon mirror that rotates at a constant speed, passes through the imaging lens 23, is folded back by the mirror 24, and is condensed on the outer peripheral surface of the photosensitive drum 26. Image. The deflected laser light is exposed and scanned in a so-called main scanning direction orthogonal to the direction in which the photosensitive drum 26 rotates, and recording is performed in line units of an image signal output from an image processing unit (not shown). Then, the writing unit 6 forms an image, that is, an electrostatic latent image, on the outer peripheral surface of the photosensitive drum 26 by repeating main scanning at a predetermined cycle corresponding to the rotational speed and recording density of the photosensitive drum 26. .

  In this way, the laser light output from the writing unit 6 is applied to the photosensitive drum 26 of the image forming system, and a main scanning synchronization signal is generated at the irradiation position of the laser light near one end of the photosensitive drum 26. A beam sensor (not shown) is arranged. Based on the main scanning synchronization signal output from the beam sensor, control of image recording timing in the main scanning direction and generation of control signals for input / output of image signals, which will be described later, are performed.

  The registration roller 25 sends the transfer paper 21 sent from the transfer paper storage unit 19 by the transfer paper sending unit 20 between the transfer member 28 and the photosensitive drum 26. The photosensitive drum 26 is formed in a columnar shape or a cylindrical shape that is rotatable around an axis. The photosensitive drum 26 is developed by the toner attached to the electrostatic latent image formed and carried by the laser output unit 22, and the toner image thus obtained is transferred onto the transfer paper 21 positioned between the transfer member 28. Transcript.

  The developing device 27 causes toner to adhere to the outer peripheral surface of the photosensitive drum 26 and develops the electrostatic latent image on the outer peripheral surface of the photosensitive drum 26. The transfer member 28 presses the transfer paper 21 against the outer peripheral surface of the photosensitive drum 26 to transfer the toner on the outer peripheral surface of the photosensitive drum 26 to the transfer paper 21 and directs the transfer paper 21 toward the fixing device 29. Send it out. The fixing device 29 fixes the toner image formed on the photosensitive drum 26 and the like onto the transfer paper 21 and discharges the transfer paper 21 out of the apparatus main body 2.

  In the image forming apparatus 1 described above, the automatic document feeder 3 automatically feeds the document 9 onto the contact glass 10 of the image reading unit 4 and automatically ejects the document 9 that has been read. In the image forming apparatus 1, the image reading unit 4 irradiates light on a document 9 set on a contact glass 10, and a reflected image from the document 9 is output by a line-type photoelectric conversion element 42 as a photoelectric conversion element described later. read.

  In the image forming apparatus 1, the writing unit 6 forms an image on the photosensitive drum 26 on the basis of the image signal of the transport layer from the document 9 photoelectrically converted by the image reading unit 4, and supplies it from the paper supply unit 5. The image is transferred and fixed on the transfer paper 21 that has been made. The image forming apparatus 1 discharges the transfer paper 21 that has been fixed to the outside of the apparatus main body 2.

  As shown in FIG. 2, the lens block 16 includes a base member 30, an imaging lens system 31, an image sensor 32, and a plurality of intermediate holding members 33.

  The base member 30 includes a flat plate portion 34 having a rectangular planar shape and both surfaces arranged in parallel with the horizontal direction, and a standing portion 35 erected from the flat plate portion 34. The flat plate portion 34, that is, the base member 30 is movably provided along the left-right direction in FIG. 1. In addition, the longitudinal direction of the flat plate portion 34 is parallel to the left-right direction in FIG.

  The standing portion 35 is erected from one end of the flat plate portion 34 in the left-right direction in FIG. 1, that is, one end in the longitudinal direction. The standing portion 35 includes a pair of standing columns 36 that are erected from both ends of the flat plate portion 34 in the width direction, and connecting columns 37 that connect end portions of these standing columns 36 on the side away from the flat plate portion 34. And is formed in a frame shape.

  The imaging lens system 31 includes two optical units 38. The optical unit 38 includes a lens barrel 39 and a lens group 40 accommodated in the lens barrel 39. The lens barrel 39 is formed in a cylindrical shape. At least one lens group 40 is press-fitted into the lens barrel 39. The lens 40 and the lens barrel 39, that is, the optical unit 38 are attached to the flat plate portion 34 of the base member 30 via the intermediate holding member 33 and are held by the base member 30.

  Further, the two optical units 38 are arranged so that their optical axes are located on the same straight line. The imaging lens system 31 configured as described above forms a reflected image from the document 9 on the line type photoelectric conversion element 42 of the image sensor 32.

  The image sensor 32 includes a package 41 and a line type photoelectric conversion element 42 as a photoelectric conversion element. The package 41 includes a base 43 as a first member made of ceramics, for example, and a window member 50 as a second member, for example.

  The base 43 is formed in a flat plate shape, and the line type photoelectric conversion element 42 is attached on the surface. The window member 50 includes a window frame 44 made of ceramics and a sealing glass 45. The window frame 44 is formed in a frame shape, and is adhered and fixed to the base 43 with the second adhesive 61 in a manner of being superimposed on the outer edge portion of the base 43. The sealing glass 45 is formed in a flat plate shape and has an outer edge portion overlapped with the wind frame 44, and is fixed to the wind frame 44 with an adhesive. The window member 50 having the above-described configuration allows the reflection image from the document 9 to pass therethrough and restricts the passage of outside air.

  The package 41 described above covers the line-type photoelectric conversion element 42 with the base 43, the window frame 44, and the sealing glass 45. The package 41 is attached to the printed wiring board 46 or the like.

  The line-type photoelectric conversion element 42 includes a PD (Photo Diode) that is a photoelectric conversion element and a CCD (Charge Coupled Device) that is a charge transport element arranged in a straight line. The longitudinal direction of the line-type photoelectric conversion element 42 is parallel to the main scanning direction.

  Further, the image sensor 32 described above includes electrodes and lead wires provided in the package 41 for electrically connecting the conductor pattern of the printed wiring board 46 and the electrodes of the line photoelectric conversion element 42 described above. It has. Further, in the image sensor 32 described above, the sealing glass 45 passes through the inside of the standing portion 35 and faces the imaging lens system 31. It is attached.

  The intermediate holding member 33 is made of, for example, a synthetic resin as a material that transmits light such as transparent ultraviolet light. As shown in FIG. 3, the first fixing portion 331 and the second fixing portion 332 are integrated. In preparation. The first fixing portion 331 and the second fixing portion 332 are each formed in a flat plate shape. A second fixing portion 332 is erected from the edge of the first fixing portion 331. In the illustrated example, the angle formed by the first fixing portion 331 and the second fixing portion 332 is 90 degrees.

  In the intermediate holding member 33, the first fixing portion 331 is overlapped with the base member 30, the second fixing portion 332 is overlapped with the lens barrel 39 and the package 41 of the image sensor 32, and the fixing portions 331, 332 and the base member are overlapped. 30, the lens barrel 39 and the package 41 of the image sensor 32 are filled with, for example, a light-curing first adhesive 62 that cures when irradiated with light such as ultraviolet rays, and the base member 30 has a lens. The lens barrel 39, that is, the imaging lens system 31, and the package 41, that is, the image sensor 32 are attached. When attached to the base member 30, the optical axis O of the imaging lens system 31 and the image sensor 32 (indicated by the alternate long and short dash line in FIG. 2) is located on the same line.

  The base member 30, the package 41, and the intermediate holding member 33 described above form a fixing structure 100 for the package 41 and the intermediate holding member 33 of the present invention. That is, the image forming apparatus 1, the image reading unit 4, and the lens block 16 are provided with a fixing structure 100. In addition, hereinafter, a portion where the first fixing portion 331 of the intermediate holding member 33 of the base member 30 is attached is referred to as an attachment portion and is denoted by reference numeral 47 (shown in FIG. 2). A location where the second fixing portion 332 of the intermediate holding member 33 of the package 41 is attached is referred to as an attachment portion and is indicated by reference numeral 48 (shown in FIGS. 2 and 3).

  Next, the fixing structure 100 of the present invention will be described in more detail. FIG. 3 is an exploded perspective view showing the fixing structure 100. FIG. 4 is a side view of the fixing structure 100.

  In the package 41 used in the first embodiment, the base 43 and the window frame 44 are bonded with a second adhesive 61. The package 41 has a protruding portion 61 a formed by the second adhesive 61 protruding from between the base 43 and the window frame 44 when the second adhesive 61 is filled. Yes.

  In the fixing structure 100, as shown in FIG. 4, the mounting portion 47 of the standing portion 35 and the first fixing portion 331 of the intermediate holding member 33 are fixed by the above-described first photocurable adhesive 62. Yes. Further, the mounting portion 48 of the package 41 and the second fixing portion 332 of the intermediate holding member 33 are fixed by the above-described first photo-curing adhesive 62.

  A concave surface 33a is provided on the facing surface 332a of the second fixed portion 332 facing the package 41. The concave portion 33 a is formed in a concave shape from the surface 332 a facing the attachment portion 48 of the second fixing portion 332. The recess 33a is formed in a groove having an arcuate cross section. The concave portion 33 a is not filled with the first adhesive 62 when the second fixing portion 332 and the package 41 are bonded and fixed with the first adhesive 62, but is blocked with the first adhesive 62. And is opposed to the protruding portion 61a described above with a gap.

  For this reason, the first portion of the intermediate holding member 33 is prevented from contacting the three points of the protruding portion 61a of the second adhesive 61, the second fixing portion 332 of the intermediate holding member 33, and the first adhesive 62. A gap S is formed between the two fixing portions 332, the mounting portion 48 of the package 41, and the first adhesive 62, that is, in the recess 33a. As described above, the first adhesive 62 bonds the intermediate holding member 33 and the package 41 so that the gap S is generated in the recess 33a.

  In the illustrated example, the concave portion 33a is formed in a groove having an arc cross section. However, in the present invention, the shape of the concave portion 33a is not limited to an arc shape in cross section, and the second fixing portion 332 of the intermediate holding member 33 and Any shape may be used as long as it is a recess formed so as not to contact the protruding portion 61a.

  A method for assembling the lens block 16 according to the first embodiment will be described below. First, the light irradiated from the light source is received by the line-type photoelectric conversion element 42, and the image sensor 32 and the image forming unit to which the printed wiring board 46 is attached so that a desired signal can be obtained from the line-type photoelectric conversion element 42. The lens system 31 is positioned.

  Then, the intermediate holding member 33 is positioned at a predetermined position, and the photocurable first adhesive 62 is filled between the intermediate holding member 33 and the base member 30 and between the intermediate holding member 33 and the optical unit 38. To do. Further, a photo-curing type first adhesive 62 is filled between the intermediate holding member 33 and the image sensor 32 so as not to fill the concave portion 33 a provided in the second fixing portion 332 of the intermediate holding member 33. To do. Thereafter, the first adhesive 62 is cured, and the optical unit 38 and the image sensor 32 are fixed to the base member 30. And the lens block 16 mentioned above is obtained. As described above, the fixing structure 100, that is, the lens block 16, causes the package 41 and the intermediate holding member 33 to be in contact with the first adhesive 62 so as to restrict the contact between the second adhesive 61 and the intermediate holding member 33. Are fixed to each other.

  As described above, in the first embodiment, the concave portion 33 a is provided in the second fixing portion 332 of the intermediate holding member 33. The second fixing portion 332 of the intermediate holding member 33 and the mounting portion 48 of the package 41 are bonded and fixed by the first adhesive 62 so as not to fill the concave portion 33a. For this reason, there is no possibility that the second adhesive 61 interferes with the second fixing portion 332 of the intermediate holding member 33. Therefore, the protrusion 61 a of the second adhesive 61 interferes with the second fixing portion 332 of the intermediate holding member 33, so that the position of the intermediate holding member 33 with respect to the package 41 is less likely to shift. As a result, the fixing structure 100, the lens block 16, the image reading unit 4, and the image forming apparatus 1 that can ensure the positioning accuracy of the photoelectric conversion element 42 with respect to the imaging lens system 31 and can perform high-accuracy imaging are obtained.

(Second Embodiment)
Next, a fixing structure, a lens block, an image reading unit, an image forming apparatus, and an intermediate holding member according to a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. FIG. 5 is a side view of the fixing structure 100 ′ in the second embodiment.

  In the first embodiment described above, the concave portion 33a is provided on the intermediate holding member 33 so that the second fixing portion 332 of the intermediate holding member 33 and the second adhesive 61 do not come into contact with each other. In the embodiment, as shown in FIG. 5, a second recess 61 b is provided in the second adhesive 61. Also in this case, the second recess 61b may be a recess that does not contact the second fixing portion 332 of the intermediate holding member 33 and the second adhesive 61.

  The second recess 61 b is provided at a position of the second adhesive 61 that faces the intermediate holding member 33, and is recessed from the outer surface 41 a that faces the intermediate holding member 33 of the package 41. The second recess 61 b is not filled with the first adhesive 62 described above, and is not blocked by the first adhesive 62. A gap S ′ is formed between the mounting portion 48 of the package 41 and the first adhesive 62 by the second recess 61 b. Thus, in the present embodiment, the first adhesive 62 bonds the intermediate holding member 33 and the package 41 so that the gap S ′ is generated in the second recess 61b.

  A method for assembling the lens block 16 according to the second embodiment will be described below. First, the light irradiated from the light source is received by the line-type photoelectric conversion element 42, and the image sensor 32 and the image forming unit to which the printed wiring board 46 is attached so that a desired signal can be obtained from the line-type photoelectric conversion element 42. The lens system 31 is positioned.

  Then, the intermediate holding member 33 is positioned at a predetermined position, and the photocurable first adhesive 62 is filled between the intermediate holding member 33 and the base member 30 and between the intermediate holding member 33 and the optical unit 38. To do. In addition, the photocurable first adhesive 62 is filled between the intermediate holding member 33 and the image sensor 32 so as not to fill the second recess 61 b provided in the second adhesive 61. Thereafter, the first adhesive 62 is cured, and the optical unit 38 and the image sensor 32 are fixed to the base member 30. And the lens block 16 mentioned above is obtained. In this way, the fixing structure 100 ′, that is, the lens block 16, is configured such that the package 41 and the intermediate holding member 33 are the first adhesive so as to restrict the contact between the second adhesive 61 and the intermediate holding member 33. 62 are bonded and fixed to each other.

  As described above, in the second embodiment, the second concave portion 61 b is provided in the second adhesive 61. Then, the second fixing portion 332 of the intermediate holding member 33 and the mounting portion 48 of the package 41 are bonded and fixed by the first adhesive 62 so as not to fill the second recess 61b. For this reason, there is no possibility that the second adhesive 61 interferes with the second fixing portion 332 of the intermediate holding member 33. Therefore, the position of the intermediate holding member 33 with respect to the package 41 is less likely to be shifted due to the second adhesive 61 interfering with the second fixing portion 332 of the intermediate holding member 33. As a result, the fixing structure 100 ′, the lens block 16, the image reading unit 4, and the image forming apparatus 1 that can ensure the positioning accuracy of the photoelectric conversion element 42 with respect to the imaging lens system 31 and can capture images with high accuracy are obtained.

  In the first and second embodiments described above, the concave portions 33a and 61b are provided on either one of the opposing surfaces of the second fixing portion 332 and the second adhesive 61 of the intermediate holding member 33. In the present invention, the concave portions 33 a and 61 b may be provided on both the second fixing portion 332 of the intermediate holding member 33 and the opposing surface of the second adhesive 61.

  In addition, this invention is not limited to the said Example. That is, various modifications can be made without departing from the scope of the present invention.

1 is an explanatory diagram illustrating an image forming apparatus according to a first embodiment of the present invention. It is a perspective view which shows the lens block of the image forming apparatus shown in FIG. FIG. 2 is an exploded perspective view showing a fixing structure of the image forming apparatus shown in FIG. 1. FIG. 2 is a side view showing a fixing structure of the image forming apparatus shown in FIG. 1. It is a side view which shows the fixing structure concerning the 2nd Embodiment of this invention. It is explanatory drawing explaining the problem of the conventional package. It is explanatory drawing explaining the problem of the conventional package.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 4 Image reading unit 16 Lens block 30 Base member 33 Intermediate holding member 33a Concave part 331 1st fixing | fixed part 332 2nd fixing | fixed part 332a Opposite surface 41 Package 41a Outer surface 42 Line type photoelectric conversion element (photoelectric conversion element) )
43 Base (first member)
50 Wind member (second member)
61 2nd adhesive 61b 2nd recessed part 62 1st adhesive 100,100 'fixing structure

Claims (10)

A fixing structure comprising: a package that accommodates a photoelectric conversion element; and an intermediate holding member that is fixed to both the package and the base member by a first adhesive,
In the fixing structure, the package includes a first member and a second member that are bonded and fixed to each other with a second adhesive.
The package and the intermediate holding member are bonded and fixed to each other with the first adhesive so as to restrict contact between the second adhesive and the intermediate holding member. Fixed structure.   A recess facing the second adhesive is provided on the surface of the intermediate holding member facing the package, and the first adhesive has a gap in the recess. The fixing structure according to claim 1, wherein the intermediate holding member and the package are bonded.   The second adhesive is provided with a second recess that is recessed from the outer surface of the package facing the intermediate holding member at a position facing the package, and the first adhesive is The fixing structure according to claim 1, wherein the intermediate holding member and the package are bonded so that a gap is generated in the second recess.   The first member is a base to which a photoelectric conversion element is attached, and the second member is a window member that allows a reflected image from a document to pass and restricts the passage of outside air. The fixing structure according to claim 1, wherein the fixing structure is provided.   The first adhesive is fixed with a photo-curing adhesive that cures when irradiated with ultraviolet rays, and the intermediate holding member is made of a material that transmits ultraviolet rays. The fixing structure according to any one of claims 1 to 4.   6. A lens block for reading a reflection image from a document by a photoelectric conversion element, comprising the fixing structure according to any one of claims 1 to 5.   7. An image reading unit comprising the lens block according to claim 6, wherein the image reading unit irradiates a document with light and photoelectrically converts a reflected image from the document with a photoelectric conversion element.   An image forming apparatus comprising the image reading unit according to claim 7.   In the intermediate holding member that is bonded and fixed to both the base member that holds the lens and the package that houses the photoelectric conversion element, the base and the window member that constitute the package do not come into contact with the second adhesive that bonds the two to each other. Further, a concave portion is provided on a surface facing the second adhesive, and the intermediate holding member.   10. The intermediate holding device according to claim 9, wherein the intermediate holding member is made of a material that transmits ultraviolet rays, and is bonded and fixed to the base member and the package with a photo-curing adhesive that cures when irradiated with ultraviolet rays. Element.

Images