JP2007150440A - Image reader and image forming apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader that can recognize the attachment position of a lens from the outside by identifying a marking visually and reliably even if attaching a read unit 33 whose attachment form differs from that of a body to the body, and can prevent working efficiency from decreasing when attaching the read unit, and to provide an image forming apparatus having the image reader. <P>SOLUTION: The read unit 33 comprises the lens 38 for forming reflection light reflected from an original surface after irradiation onto the original surface from a light source 34 on the image formation surface of an image pickup device 39; the image pickup device 39 for converting the formed reflection light to an electric signal; and a fixing means comprising a support bracket 40, or the like for holding the lens 38 and the image pickup device 39. The markings 51, 52 are provided at a position that becomes symmetrical to the direction of an optical axis of the reflection light at the outer-periphery section of the lens 38 so that the focus distance between the image pickup device 39 and the lens 38 becomes a position of a rotation direction for meeting the specifications of lens characteristics, such as a magnification and MTF. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus and an image forming apparatus provided with the image reading apparatus. The present invention relates to an image reading apparatus such as an image forming apparatus, and an image forming apparatus such as a facsimile machine, a copying machine, and a multifunction machine including the image reading apparatus.

  In an image reading apparatus provided in an image forming apparatus such as a copying machine, a facsimile machine, or a multifunction machine, light is emitted from a light source to a document surface, and reflected light from the document is incident on a lens through a plurality of mirrors. The original is read by forming an image on an image pickup device such as a CCD line sensor by this lens and converting it into an electric signal.

  In such an image reading apparatus using a CCD line sensor, reading in the main scanning direction is performed by pixels arranged in the main scanning direction of the CCD line sensor, and reading in the sub-scanning direction is performed by moving a document, a light source or a mirror. This is done by moving the optical system.

  On the other hand, in order to ensure image quality, it is necessary to ensure the respective optical characteristics in the main scanning direction and the sub-scanning direction. Usually, there is a difference in characteristics between the main scanning and the sub-scanning. In order to satisfy the specifications such as magnification and MTF (Modulation Transfer Function), the rotation direction of the lens relative to the optical axis direction of the lens with respect to the CCD line sensor is required. It is necessary to manage the position of.

  For this reason, there has been proposed a method in which a marking that serves as a mark for the mounting position is formed in advance on the lens surface (surface through which light is transmitted), and the lens is mounted on the mounting portion using this marking as a mark (for example, Patent Documents). 1).

  If this method is used to attach the lens and the CCD line sensor to the attachment part, the lens and the CCD line sensor can be attached to the attachment part by easily setting the rotational position of the lens relative to the optical axis direction. , Specifications such as magnification and MTF can be satisfied.

  Hereinafter, such an adjustment method will be specifically described with reference to FIG. In FIG. 17, the reading unit includes a support bracket 1 that is attached to the main body of the image reading apparatus, and a lens bracket 3 that holds a lens 2 is attached to the support bracket 1.

  An opening 3a is formed in the support bracket 1 and the lens bracket 3, and a part of the lens 2 is inserted into the opening 3a. The lens 2 is held by a semicircular bracket 3b. The lens 2 is fixed to the lens bracket 3 by fixing the bracket 3b to the lens bracket 3 with a bolt 3c.

  Further, a CCD substrate 5 having a CCD line sensor (not shown) is attached to the lens bracket 3 via a CCD bracket 4. In addition, a marking 6 is provided on the lens surface (surface through which light is transmitted) of the lens 2, and when the lens characteristic is inspected, the marking 6 has a rotation direction of the lens 2 with the optical axis direction as the rotation center. The position is attached to the outer periphery of the lens 2 when it is determined that the focal length between the CCD line sensor and the lens 2 is a rotational position that satisfies specifications such as magnification and MTF.

The operator can easily attach the lens 2 to the lens bracket 3 at a position satisfying the specifications by attaching the lens 2 to the lens bracket 3 with the marking 6 facing upward.
JP-A-5-224293

  However, in such a lens mounting method, since the marking 6 is attached to one position on the outer peripheral portion of the lens 2, when the lens 2 is assembled to the lens bracket 3, and after the assembly operation is performed. When the reading unit is attached to the main unit of the image reading apparatus, the visible portion of the lens 2 may be different. In this case, it may be confirmed whether or not the lens is correctly assembled to the reading unit. It becomes difficult.

  Specifically, in the state shown in FIG. 17, the reading unit is attached to the main body so that the support bracket 1 is positioned above the main body of the image reading apparatus, so that the lens remains attached to the main body with the reading unit. By checking the marking 6 in FIG. 2, it is possible to confirm whether or not the lens 2 is attached to the lens bracket 3 at a position in the correct rotation direction.

  However, in the reading unit configured to mount the reading unit so that the support bracket 1 is positioned below the main body of the image reading apparatus, the marking 6 cannot be seen even when the lens 2 is viewed from either the upper or lower direction. The reading unit was removed from the main body, and it was necessary to check whether or not the lens 2 was attached to the lens bracket 3 at a position in the correct rotation direction. For this reason, the problem that the work efficiency of the attachment operation | work of a reading unit will deteriorate will generate | occur | produce.

  The present invention has been made to solve the conventional problems, and even when a reading unit having a different mounting form with respect to the main body is mounted on the main body, the marking can be surely seen and the lens mounting position can be confirmed from the outside. An object of the present invention is to provide an image reading apparatus and an image forming apparatus provided with the image reading apparatus that can prevent a reduction in work efficiency of a reading unit mounting operation.

  An image reading apparatus according to the present invention includes a lens that forms an image of reflected light reflected from the original surface after being irradiated from a light source on the imaging surface of an image sensor, and electrically outputs the reflected light thus formed. The image sensor for converting to a signal and an opening, the lens being held in a state in which a part of the lens is inserted into the opening, and the image sensor being separated from the lens by a predetermined distance. In the image reading apparatus having a reading unit including a fixing unit that holds and fixes the lens to the main body, the outer peripheral portion of the lens serves as a mark for a mounting position of the lens when the lens is fixed to the fixing unit. First identification means and second identification means are provided, and the first identification means and the second identification means are configured to be provided at positions symmetrical with respect to the optical axis direction of the reflected light.

  With this configuration, the first identification unit and the second identification unit are provided on the outer peripheral portion of the lens so that the focal length between the imaging element and the lens is in a rotational direction that satisfies specifications such as magnification and MTF. The lens can be attached to the fixing means by simply setting the position in the rotation direction of the lens with the optical axis direction as the center of rotation, using the first identification means or the second identification means as a mark. For this reason, the lens can be easily attached to the fixing means at a position corresponding to the lens characteristics.

  In addition, since the first identification means and the second identification means are provided at positions symmetrical with respect to the optical axis direction of the reflected light, and the lens is attached to the fixing means with a part of the lens inserted into the opening, the main body On the other hand, even when a reading unit having a different attachment form is attached to the main body, one of the first identification means and the second identification means can be reliably visually recognized from the outside.

  For this reason, the attachment position of the lens can be easily confirmed from the outside, and it is possible to prevent the work efficiency of the attachment operation of the reading unit from being lowered.

  Further, the first identification means and the second identification means of the image reading apparatus of the present invention are configured to be identifiable in appearance.

  With this configuration, the first identification means and the second identification means can be distinguished from each other by, for example, different colors of the first identification means and the second identification means. For example, the reading unit can be used with different types of image reading apparatuses. When used in common, even if the mounting direction of the reading unit is different, by attaching the lens to the fixing means with reference to the same color identification means, the position of the lens in the rotation direction can be unified to satisfy the lens performance. It becomes possible.

  As described above, even when the reading unit having a different mounting form with respect to the main body is attached to the main body, one of the first identification means and the second identification means can be reliably visually recognized from the outside.

  Further, in the image reading apparatus of the present invention, the second identification means indicates a deviation direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation direction is a design standard of conjugate length. It is composed of an indication of the mounting direction set according to the characteristics of the lens set for the value.

  In that case, when the image unit is mounted on the main unit, the mounting position of the image unit is set in advance so that the lens position matches the design standard value of the conjugate length. It is necessary to adjust the mounting position to satisfy the design standard value (specification).

  For this reason, the mounting direction set according to the characteristic of the lens set with respect to the design reference value of the conjugate length is second identified as the deviation direction of the actual mounting position with respect to the reference mounting position when the lens is mounted on the fixing means. Express by means.

  For example, if the mounting direction in which the lens is moved in one direction with respect to the optical axis direction from the reference mounting position is expressed by the second identification means, the lens is moved in one direction and the other direction with respect to the optical axis direction. The lens can be attached to the fixing means at the actual attachment position according to the individual lens characteristics without the need to move the lens between the two and adjust the magnification, thereby improving the workability of the magnification adjustment work.

  Further, in the image reading apparatus of the present invention, the second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are conjugate. It is composed of numerical values corresponding to the characteristics of the lens set with respect to the long design reference value.

  With this configuration, the deviation amount and direction set according to the characteristic of the lens set with respect to the design reference value of the conjugate length as the deviation amount and direction of the actual attachment position with respect to the reference attachment position when the lens is attached to the fixing means, and If the direction is expressed by the second identification means, for example, if the second identification means is used to move the lens by A mm in one direction with respect to the optical axis direction from the reference mounting position, then the optical axis direction. The lens can be mounted on the fixing means at the actual mounting position according to the individual lens characteristics without the need to adjust the magnification by moving the lens between one direction and the other. The workability of the work can be improved.

  Further, in the image reading apparatus of the present invention, the second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are conjugate. It is composed of a bar code in which a numerical value corresponding to the characteristic of the lens set with respect to the long design reference value is written.

  With this configuration, the deviation amount and direction set according to the characteristic of the lens set with respect to the design reference value of the conjugate length as the deviation amount and direction of the actual attachment position with respect to the reference attachment position when the lens is attached to the fixing means, and If the direction is expressed by the second identification means, for example, the second identification means is represented by a bar code in which data is written so as to move the lens by A mm in one direction with respect to the optical axis direction from the reference mounting position. By doing so, the lens is moved between one direction and the other direction with respect to the optical axis direction by attaching the lens based on the moving direction and the amount of displacement of the lens obtained by reading the barcode. This eliminates the need to perform magnification adjustment and allows the lens to be mounted on the fixing means at the actual mounting position according to the individual lens characteristics, thereby improving the workability of magnification adjustment. Kill.

  Further, by reading the barcode, information regarding the magnification adjustment work can be reflected in the assembling apparatus, and the workability of the magnification adjustment work can be further improved.

  In the image reading apparatus of the present invention, the second identification unit indicates a shift direction of the actual mounting position with respect to a reference mounting position of the image sensor, and the shift direction is an image height direction of the lens and the image sensor. It is composed of a lens that indicates the mounting direction according to the characteristics of the lens set with respect to the design reference value of the focal length.

  In that case, the mounting of the image sensor to the lens so that the focal length in the image height direction of the lens and the image sensor when the image sensor is mounted to the fixing means after the lens is mounted to the fixing means matches the design reference value (specification). Since the position is set in advance, it is necessary to adjust the focal length in the image height direction of the lens and the image pickup device according to the individual lens characteristics.

  For this reason, according to the characteristic of the lens set with respect to the design reference value of the focal length in the image height direction of the lens and the image sensor as the deviation direction of the actual mounting position with respect to the reference mounting position when mounting the lens to the fixing means The attachment direction is represented by the second identification means.

  For example, with respect to the lens attached to the fixing means, if the mounting direction in which the image pickup device is moved in one direction in the optical axis direction from the reference mounting position is represented by the second identification means, This eliminates the need to adjust the MTF by moving the image sensor between one direction and the other direction, and allows the image sensor to be attached to the fixing means at the actual attachment position according to the individual lens characteristics. The workability of the adjustment work can be improved.

  In the image reading apparatus of the present invention, the second identification unit indicates a deviation amount and a direction of the actual attachment position with respect to a reference attachment position of the imaging element, and the deviation amount and direction are determined between the lens and the imaging element. It is constituted by a numerical value of a focal length change amount corresponding to the characteristic of the lens set with respect to the design reference value of the focal length in the image height direction.

  With this configuration, if the mounting direction in which the image sensor is moved by A mm in one direction of the optical axis direction from the reference mounting position with respect to the lens mounted on the fixing unit is represented by the second identification unit, the optical axis It is possible to attach the image sensor to the fixing means at the actual mounting position according to the individual lens characteristics without the need for adjusting the MTF by moving the image sensor between one direction and the other direction with respect to the direction. Thus, the workability of the MTF adjustment work can be improved.

  In the image reading apparatus of the present invention, the second identification unit indicates a deviation amount and a direction of the actual attachment position with respect to a reference attachment position of the imaging element, and the deviation amount and direction are determined between the lens and the imaging element. It is composed of a bar code in which a numerical value of the focal length change amount corresponding to the lens characteristic set with respect to the design reference value of the focal length in the image height direction is written.

With this configuration, if the mounting direction that moves the image sensor from the reference mounting position in one direction of the optical axis by A mm is written on the barcode with respect to the lens mounted on the fixing means, this data is read. By adjusting the position of the lens and the image sensor, it is not necessary to adjust the magnification by moving the image sensor between one direction and the other direction with respect to the optical axis direction, and according to the individual lens characteristics The imaging element can be attached to the fixing means at the actual attachment position, and the workability of the MTF adjustment work when attaching the imaging element to the fixing means can be improved.
Further, by reading the bar code, information relating to the MTF adjustment work can be reflected in the assembling apparatus, and the workability of the MTF adjustment work can be further improved.

  Further, in the image reading apparatus of the present invention, one of the first identification means and the second identification means indicates a deviation direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means. The direction represents a value corresponding to the characteristic of the lens set with respect to the design reference value of the conjugate length, and the other of the first identification unit and the second identification unit is an actual position relative to the reference mounting position of the image sensor. Indicates the direction of displacement of the mounting position, and the direction of displacement comprises the direction of attachment according to the characteristics of the lens set with respect to the design reference value of the focal length in the image height direction of the lens and the image sensor. Has been.

  This configuration eliminates the need to adjust the magnification and MTF by moving the lens and image sensor between one direction and the other with respect to the optical axis direction, and allows actual mounting according to individual lens characteristics. The lens and the image sensor can be attached to the fixing means at the position, and the workability of the magnification adjustment work and the MTF adjustment work can be improved.

  Further, in the image reading apparatus of the present invention, one of the first identification unit and the second identification unit shows a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing unit, The deviation amount and direction are represented by numerical values corresponding to the characteristics of the lens set with respect to a design reference value of conjugate length, and the other of the first identification unit and the second identification unit is A displacement amount and direction of an actual attachment position with respect to a reference attachment position are indicated, and the displacement amount and direction correspond to characteristics of the lens set with respect to a design reference value of a focal length in the image height direction of the lens and the image sensor. It consists of what is represented by the numerical value of the corresponding focal length change amount.

  This configuration eliminates the need to adjust the magnification and MTF by moving the lens and image sensor between one direction and the other with respect to the optical axis direction, and allows actual mounting according to individual lens characteristics. The lens and the image sensor can be attached to the fixing means at the position, and the workability of the magnification and MTF adjustment work when attaching the lens and the image sensor to the fixing means can be improved.

  Further, in the image reading apparatus of the present invention, one of the first identification unit and the second identification unit shows a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing unit, The deviation amount and direction are represented by a barcode in which a numerical value corresponding to the characteristic of the lens set with respect to the design reference value of the conjugate length is written, and the other of the first identification unit and the second identification unit Indicates the deviation amount and direction of the actual attachment position with respect to the reference attachment position of the image sensor, and the deviation amount and direction are set with respect to the design reference value of the focal length in the image height direction of the lens and the image sensor. Further, it is constituted by a bar code in which a numerical value of the focal length change amount corresponding to the characteristic of the lens is written.

  With this configuration, it is not necessary to adjust the mounting position of the lens or image sensor by moving the lens or image sensor between one direction and the other direction with respect to the optical axis direction. The lens and the image sensor can be attached to the fixing means at the actual attachment position, and the workability of the magnification adjustment operation and the MTF adjustment operation can be improved.

  Further, by reading the barcode, information regarding the magnification adjustment work and the MTF adjustment work can be reflected in the assembly apparatus, and the workability of the magnification adjustment work and the MTF adjustment work can be further improved.

  In the image reading apparatus of the present invention, either the first identification unit or the second identification unit is configured to be set at a position where the lens can be viewed from above in the vertical direction when the lens is assembled to the fixing unit. Is done.

With this configuration, the lens is attached to the fixing means so that the first identification means or the second identification means faces upward in the vertical direction, so that the lens can be easily positioned and attached to the fixing means at a position corresponding to the lens characteristics. Can do.
Further, information according to the lens characteristics set with respect to the design reference value of the conjugate length and the design reference value of the focal length in the image height direction can be easily visually recognized from the information.

  Further, the lens of the image reading apparatus of the present invention has a first fitting portion in the vicinity of the first identification means, and a second fitting portion in the vicinity of the second identification means, and the fixing means. Has a third fitting portion into which the first fitting portion or the second fitting portion is fitted when the lens is held.

  With this configuration, when the lens is attached to the fixing means, the first fitting portion or the second fitting portion is fitted to the third fitting portion of the fixing means, so that the first identification means or the second identification means faces upward. In this state, the lens can be easily positioned on the fixed member, and information according to the lens characteristics set for the design reference value for the conjugate length and the design reference value for the focal length in the image height direction. Easily visible.

An image forming apparatus according to the present invention includes an image forming unit that forms an image on a recording medium and the image reading apparatus described above.
With this configuration, even when a reading unit with a different mounting configuration is attached to the main unit, the marking can be reliably visually confirmed and the lens mounting position can be confirmed from the outside. Can be provided, and an image forming apparatus provided with the image reading apparatus can be provided.

  In the present invention, even when a reading unit having a different mounting form with respect to the main body is mounted on the main body, the marking can be surely seen and the lens mounting position can be confirmed from the outside, and the work efficiency of the reading unit mounting work Can be provided, and an image forming apparatus provided with the image reading apparatus can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 are diagrams showing a first embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention, and show an example in which the image forming apparatus is applied to a copying machine. . The image forming apparatus is not limited to a copying machine, and can be applied to any apparatus that includes an image reading apparatus such as a facsimile machine or a multifunction machine.

  First, the configuration will be described. In FIG. 1, a copying machine 10 as an image forming apparatus includes an automatic document feeder (hereinafter simply referred to as ADF) 11, a paper feeding unit 12, an image reading unit (image reading device) 13, and an image forming unit (image forming unit). 14 is provided.

  The ADF 11 transports a document placed on a document tray 16 onto a contact glass 15 by a separation feeding unit 17 including various rollers such as a feeding roller and a separation roller. After being carried out from the contact glass 15, the paper is discharged onto a paper discharge tray 20 by a paper discharge means 19 comprising various paper discharge rollers.

  When reading both sides of the document, the document is returned onto the contact glass 15 by the branching mechanism provided on the paper discharge means 19 and the conveyor belt 18 to read the unread surface.

  The paper feeding unit 12 includes paper feeding cassettes 21a and 21b that store recording papers of different sizes, and paper feeding means 22 including various rollers that transport the recording papers stored in the paper feeding cassettes 21a and 21b to an image forming position. It has.

  The image reading unit (image reading apparatus) 13 includes a first traveling body 31, a second traveling body 32, and a reading unit 33, and reads a document conveyed on the contact glass 15 as will be described in detail later. At this time, the first traveling body 31 and the second traveling body are fixed to the lower left side on the contact glass 15 side, and when the original placed on the contact glass 15 is read, the first traveling body 31 and the second traveling body are fixed. The traveling body is moved below the contact glass 15 in the left-right direction in FIG.

  The image forming unit 14 includes an exposure device 23 that forms a write signal based on a read signal captured by the reading unit 33, and a plurality of photosensitive drums 24 on which a write signal generated by the exposure device 23 is formed. The developing device 25 filled with different color toners and supplying the different color toners to the respective photosensitive drums 24 to visualize the writing signals, and the visible images formed on the photosensitive drums 24 are overlapped. Then, a color image is formed by being transferred, and a transfer belt 26 for transferring the color image to the recording paper fed from the paper supply unit 12 and the color image fixed on the recording paper are fixed on the recording paper. And a fixing device 27.

  A light source 34 and a first mirror 35 are mounted inside the first traveling body 31. The light source 34 is composed of a halogen lamp or the like, and irradiates a document passing through the contact glass 15 or a document placed on the contact glass 15. The first mirror 35 is supported by the first traveling body 31 at both ends on the front side and the back side in FIG. 1 so that light reflected from the document surface is incident thereon.

  Further, a second mirror 36 and a third mirror 37 are mounted on the second traveling body 32. The second mirror 36 and the third mirror 37 have second end portions on the near side and the far side in FIG. The light supported by the traveling body 32 and reflected from the first mirror 35 is reflected in the order of the second mirror 36 and the third mirror 37.

  The reading unit 33 is equipped with a lens 38 and an image sensor 39 such as a CCD line sensor in which a plurality of element surfaces are arranged in the scanning direction. The light reflected from the third mirror 37 is the lens 38. Then, the light is focused on the image sensor 39 and converted into an analog image signal corresponding to the image data on the original surface.

  The first traveling body 31 and the second traveling body 32 are each attached with a wire of a known drive mechanism (not shown), and are slidably attached to a traveling rail constituting a part of the main body of the image reading unit 13. The wire extends to the left and right of the image reading unit 13 in FIG.

  When reading a document placed on the contact glass 15, the drive mechanism is driven in response to an image reading request signal for each line sent from a host computer (not shown) of the copying machine 10. Thus, by moving the wire in the left-right direction in FIG. 1, the first traveling body 31 and the second traveling body 32 move from the light source 34 to the contact glass 15 while moving along the document surface at a speed of 2: 1. The upper document surface is irradiated with light.

  Therefore, the document surface is optically scanned in the sub-scanning direction, and the reflected light is reflected in the order of the first mirror 35, the second mirror 36, and the third mirror 37, and then passes through the lens 38 to the element surface of the image sensor 39. As a result, the original surface is read.

  2 and 3 are configuration diagrams of the reading unit 33. FIG. 2 and 3, the flat support bracket 40 is made of a sheet metal member, and the support bracket 40 is attached to the traveling rail of the image forming unit 13 with bolts or the like. As described above, the first traveling body 31 and the second traveling body 32 are slidably attached to the traveling rail.

  A first holding bracket 41 made of a black steel plate is attached to the support bracket 40 as a sheet metal member, and the first holding bracket 41 is fastened to the support bracket 40 by four bolts 42a and 42b.

  The support bracket 40 and the first holding bracket 41 are formed with openings 40a and 41a having the same area, and the lens 38 is a semicircular bracket with a part thereof inserted into the openings 40a and 41a. It is held so as to be firmly clamped by 43. Both ends of the bracket 43 are fixed to the first holding bracket 41 by bolts 43 a, and the lens 38 is configured by the bracket 43 to the first holding bracket 41.

  In addition, an elongated hole extending in the optical axis direction of the reflected light is formed in one of the support bracket 40 and the first holding bracket 41, and either one of the support bracket 40 and the first holding bracket 41 is formed in the other. A round hole is formed. Bolts 42a and 42b are attached to the elongated hole and the round hole, and the bolts 42a and 42b are fastened with nuts (not shown), whereby the support bracket 40 and the first holding bracket 41 are moved in the optical axis direction. The support bracket 40 and the first holding bracket 41 can be fastened by being moved.

Further, a second holding bracket 44 made of a black steel plate is attached as a sheet metal member to one end portion in the optical axis direction with respect to the first holding bracket 41, and the second holding bracket 44 is secured by bolts 45a and 45b. It is attached to the first holding bracket 41.
A circuit board 46 for holding the image sensor 39 is attached to the second holding bracket 44. The circuit board 46a is fixed to the second holding bracket 44 by bolts 50a and 50b, and the image sensor 39 is attached to the lens 38. Opposite each other at a predetermined distance in the optical axis direction.

  In addition, an elongated hole extending in the optical axis direction is formed in one of the second holding bracket 44 and the circuit board 46, and a round hole is formed in either the second holding bracket 44 or the circuit board 46. The second holding bracket 44 and the circuit board 46 are moved in the optical axis direction by attaching bolts 50a and 50b to the elongated holes and round holes and fastening the bolts 50a and 50b with nuts (not shown). The second holding bracket 44 and the circuit board 46 can be fastened.

  In the present embodiment, the support bracket 40, the first holding bracket 41, the bracket 43, and the second holding bracket 44 constitute fixing means for holding the lens 38 and the image sensor 39 and attaching them to the main body.

  The circuit board 46 includes an analog / digital converter, a binarization circuit, a multi-value circuit, a gradation processing circuit, a scaling processing circuit, an editing processing circuit, and the like, and is converted into an analog signal by the image sensor 39. The scanned data of the original is converted into a digital image signal by an analog / digital converter, and the image data generated by binarization processing, multi-value processing, gradation processing, scaling processing, and editing processing is formed into an image. The data is transmitted to the unit 14.

  On the other hand, as shown in FIG. 4, a marking (first identification means) 51 and a marking (second identification means) 52 are provided on the outer peripheral portion of the lens 38, and the markings 51, 52 hold the lens 38 as the first. It serves as a mark for the mounting position of the lens 38 when fixed to the bracket 41.

  The markings 51 and 52 are provided symmetrically with respect to the optical axis direction, that is, at positions separated by 180 °, and can be distinguished from each other by being color-coded by blue or red.

  The markings 51 and 52 are provided at positions for guaranteeing lens characteristics such as magnification and MTF when the lens 38 and the image pickup device 39 are assembled to the reading unit 33. The markings 51 and 52 are marked on the lens 38 in the process of inspecting the lens characteristics. It is what is done. When the lens 38 is attached to the first holding bracket 41, the lens 38 is set to a position in the rotational direction visible from above in the vertical direction. When the lens 38 is attached to the position in the rotational direction, the lens characteristics are set to the design reference value ( Specification).

  In the reading unit 33 having such a configuration, the bracket 38 holds the lens 38 so that the marking 52 faces upward, and the bracket 43 is fixed to the first holding bracket 41 with a bolt 43a. The lens 38 is fixed to the first holding bracket 41.

  Next, the mounting position of the lens 38 is positioned at a position where the conjugate length (distance from the document surface to the image sensor) becomes the design reference value by an assembly device (not shown), and the first holding bracket 41 is supported by the bolts 42a and 42b. Secure to.

  Next, after temporarily positioning the second holding bracket 44 on the first holding bracket 41 and adjusting the focal length in the image height direction between the lens 38 and the image sensor 39, the circuit board 46 is held second by the bolts 50a and 50b. Fix to the bracket 44. Next, the support bracket 40 is attached to the rail with bolts or the like. At this time, since the reading unit 33 is attached to the rail from above, the reading unit 33 can be seen by visually observing the marking 51 from above whether or not the lens 38 has been attached at a position in the normal rotation direction that satisfies the lens characteristics. It can be confirmed when mounted on the rail.

  As described above, in the present embodiment, the reflected light of the outer peripheral portion of the lens 38 is adjusted so that the focal length between the image sensor 39 and the lens 38 is a position in the rotation direction that satisfies the specifications of the lens characteristics such as magnification and MTF. By providing the markings 51 and 52 at positions symmetrical with respect to the optical axis direction, the position in the rotation direction of the lens 38 with the optical axis direction as the rotation center can be easily set with the marking 51 or the marking 52 as a mark. The lens 38 can be attached to the support bracket 40 via the first holding bracket 41. Therefore, the lens 38 can be easily attached to the support bracket 40 via the first holding member 41 at a position corresponding to the lens characteristics.

  On the other hand, depending on the model of the copying machine 10, the reading unit 33 may be attached to the rail from below as shown in FIGS. In this case, since the lens 38 is shielded by the rail, the lens 38 cannot be viewed from the outside.

  In the present embodiment, the markings 51 and 52 are provided symmetrically with respect to the optical axis direction, and the lens 38 is attached to the first holding bracket 41 with a part of the lens 38 being inserted into the openings 40a and 41a. By visually observing the marking 52 located immediately below the lens 38 with the reading unit 33 attached to the rail, the lens is positioned at a normal rotational direction satisfying the lens characteristics without removing the reading unit 33 from the traveling rail. It is possible to check whether or not 38 has been attached, and it is possible to prevent the working efficiency of the attaching operation of the reading unit 33 from being lowered.

  In addition, when the lens 38 is attached to the first holding bracket 41, the marking 51 or the marking 52 is set at a position where it can be seen from above in the vertical direction, so that the lens 38 can be easily attached to the first holding bracket 41 at a position corresponding to the lens characteristics. Can be positioned and attached.

  In the present embodiment, since the marking 51 and the marking 52 can be distinguished from each other by color coding or the like, the mounting direction of the reading unit 33 is used when the reading unit 33 is commonly used in the copying machines 10 of different models. Even if they are different, by attaching the lens 38 to the first holding bracket 41 with reference to the marking 51 or the marking 52 of the same color, it is possible to unify the position in the rotational direction of the lens 38 and satisfy the lens performance.

In this way, even when the reading unit having a different mounting form with respect to the main body is attached to the main body, the marking 51 or the marking 52 can be reliably visually recognized from the outside.
Specifically, in the copying machine 10, the document setting reference is often biased to one side in the main scanning direction, for example, the back side of the contact glass 15 in FIG. This is because an original can be easily set on the contact glass 15.

  Considering that various sizes of originals are used in this case, it is better to give priority to the image quality on the reference side, and the characteristics of both ends of the lens 38 (right and left direction with the central axis in the optical axis direction) are compared. Thus, it is better to assemble the reading unit 33 so that the better characteristic comes to the reference side.

  Even if the lens 38 is arranged symmetrically with respect to the central axis in the optical axis direction, basically the same characteristics can be obtained. However, if there is a difference in characteristics at both ends of the image, the optical characteristics of the reading unit 33 can be obtained. The characteristics are different.

  When the lens 38 developed in one model is also used in another model, the assembly and adjustment may be reversed depending on the configuration of the copying machine. Therefore, including the symmetry direction with respect to the central axis of the optical axis direction. It is necessary to match the position of the lens 38 in the rotational direction. As shown in the present embodiment, if the markings 51 and 52 are identifiable in appearance, they can be assembled according to the model, and the direction of the lens 38 can be unified based on one marking even if the adjustment direction changes. It can be done.

  FIGS. 7 to 9 are views showing a second embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. Note that the present embodiment is different from the first embodiment only in the lens configuration, and therefore will be described with reference to the drawings used in the first embodiment.

  In FIG. 7, a marking (first identification means) 61 and a marking (second identification means) 62 are provided on the outer peripheral portion of the lens 38, and the markings 61 and 62 are provided at positions symmetrical with respect to the optical axis direction. It has been.

  The marking 61 is represented by a predetermined color, for example, and the marking 62 is represented by a symbol or a number. Specifically, the marking 62 indicates a deviation direction of the actual attachment position with respect to the reference attachment position when the lens 38 is attached to the support bracket 40 via the first holding bracket 41, and this deviation direction is a design standard for conjugate length. The attachment direction set according to the characteristic of the lens 38 set with respect to the value is shown.

  For example, it is assumed that the design standard value of the conjugate length is 400 mm. This design reference value is defined as the distance from the document surface to the actual mounting position of the lens 38. In addition, since the support bracket 40 is adapted to be attached to the traveling rail at a position corresponding to the design standard value of the conjugate length, by adjusting the attachment position of the first holding bracket 41 with respect to the support bracket 40, The actual mounting position of the lens 38 is determined according to the lens characteristics.

  Assuming that the design standard value of the conjugate length is 400 mm, the lens characteristics inspected with respect to this conjugate length are shorter (the mounting position of the lens 38 is closer to the document surface side), and the center (matches the design standard value). The three types of information that are long (the mounting position of the lens 38 is far from the original surface) are represented by symbols “−”, “0”, and “+”, respectively, and this symbol is used as the marking 62.

  For example, when the marking 62 is “−”, the lens 38 is attached to the first holding bracket 41 with the marking 62 facing upward, and the position of the first holding bracket 41 and the support bracket 40 is adjusted. Enter "-".

  Here, normally, if the lens 38 is positioned at the reference mounting position that matches the design reference value of the conjugate length, the lens 38 can be assembled so as to satisfy the lens characteristics. If the adjustment operation is performed so that the lens is mounted at the reference mounting position due to manufacturing variations, the lens 38 cannot be assembled so as to satisfy the lens characteristics.

  In the present embodiment, “−” is input to the assembling apparatus, and the assembly position of the lens 38 is adjusted so that the position corresponds to the characteristic of the lens 38. That is, by adjusting the positions of the first holding bracket 41 and the support bracket 40 by moving the first holding bracket 41 in one direction from the reference mounting position so that the mounting position of the lens 38 is close to the document surface side, The first holding bracket 41 is attached to the support bracket 40 at the actual attachment position according to the lens characteristics.

  In this way, if the mounting direction in which the lens is moved in one direction with respect to the optical axis direction from the reference mounting position is represented by the marking 62, the lens 38 is moved between the one direction and the other direction with respect to the optical axis direction. The lens 38 can be attached to the support bracket 40 via the first holding bracket 41 at the actual attachment position according to the individual lens characteristics, without the need for the work of adjusting the magnification by moving between them. Workability can be improved.

  In the present embodiment, the marking 62 indicates the deviation direction of the actual attachment position with respect to the reference attachment position, and this deviation direction is set according to the characteristics of the lens 38 set with respect to the conjugate reference design value. Although the mounting direction is set, as shown in FIG. 8, the marking 63 indicates the amount and direction of displacement of the actual mounting position with respect to the reference mounting position when the lens 38 is mounted on the support bracket 40 via the first holding bracket 41. By using the marking 63, the amount of deviation and the direction may be expressed by a numerical value corresponding to the characteristic of the lens set with respect to the design reference value of the conjugate length.

  That is, as shown in FIG. 8, when the marking 63 represents “−1”, it can be determined that the conjugate length of the lens is 399 mm and the mounting position of the lens 38 is close to the document surface side.

When this numerical value is input to the assembling apparatus, the assembling apparatus adjusts the positions of the first holding bracket 41 and the support bracket 40 by moving the first holding bracket 41 by 1 mm in one direction from the reference mounting position, so that the lens characteristics are obtained. The first holding bracket 41 can be attached to the support bracket 40 at an actual attachment position according to the above.
Conversely, if the marking 63 represents “+1”, it can be determined that the conjugate length of the lens is 401 mm and the mounting position of the lens 38 is far from the document surface.

  When this numerical value is input to the assembling apparatus, the assembling apparatus adjusts the positions of the first holding bracket 41 and the support bracket 40 by moving the first holding bracket 41 in the other direction by 1 mm from the reference mounting position, and the lens characteristics. The first holding bracket 41 can be attached to the support bracket 40 at an actual attachment position according to the above.

  In this way, it is not necessary to adjust the magnification by moving the lens 38 between one direction and the other direction with respect to the optical axis direction, and the lens 38 is mounted at the actual mounting position according to the individual lens characteristics. Can be attached to the support bracket 40 via the first holding bracket 41, and the workability of the magnification adjustment work can be further improved.

  Further, as shown in FIG. 9, the marking (second identification means) 64 may be constituted by a bar code in which the deviation amount and direction from the actual attachment position are written. In this case, the lens 38 is attached between one direction and the other direction with respect to the optical axis direction by attaching the lens 38 on the basis of the moving direction and the shift amount of the lens obtained by reading the barcode. The lens 38 can be attached to the support bracket 40 via the first holding bracket 41 at the actual attachment position according to the individual lens characteristics without the need to move and adjust the magnification. Can be improved.

  Further, by reading the barcode, information regarding the magnification adjustment work can be reflected in the assembling apparatus, and the workability of the magnification adjustment work can be further improved.

  Even in the present embodiment, even when the markings 62, 63, and 64 are shielded by the traveling rail and cannot be seen from the outside, the lower marking 62 can be visually observed. Thus, it can be surely confirmed whether or not the lens 38 is attached.

  10 to 14 are views showing an image reading apparatus according to the present invention and an image forming apparatus having the image reading apparatus according to a third embodiment. Note that the present embodiment is different from the first embodiment only in the lens configuration, and therefore will be described with reference to the drawings used in the first embodiment.

  In FIG. 10, a marking (second identification means) 65 and a marking (second identification means) 66 are provided on the outer peripheral portion of the lens 38, and the markings 65 and 66 are provided at positions symmetrical with respect to the optical axis direction. It has been.

  The marking 65 is represented by a predetermined color, for example, and the marking 66 is represented by a symbol or a number. Specifically, the marking 66 indicates a deviation direction of the actual attachment position with respect to the reference attachment position of the image sensor 39, and this deviation direction is relative to the design reference value of the focal length of the lens 38 and the image sensor 39 in the image height direction. The attachment direction corresponding to the characteristic of the lens 38 set in the above is shown.

  Specifically, the amount of change in the focal length in the image height direction is the difference in focal length between the center and the end of the image sensor 39 in the main scanning direction. It is ideal that the most focused position, that is, the position where the MTF is maximum is the same at any position on the image. However, as shown in FIG. The position may be in front of the center (hereinafter referred to as under, see FIG. 11B)) or in the back (hereinafter referred to as over).

  For example, in the case of under, the position closer to the lens 38 than the position where the image plane is most focused (MTF is maximum) at the center of the image of the image sensor 39 is considered to be balanced with the end of the image sensor 39. Moreover, it is preferable. In the case of over, the opposite is true.

  From this point, when the underover characteristic of the lens 38 is displayed on the lens, it is possible to easily estimate in which direction the image plane should be moved from the position where the MTF becomes maximum at the center. Thus, the adjustment efficiency is improved.

  In the present embodiment, when the image plane position at which the MTF is maximum at the edge of the image is under closer to the lens 38 side than the position at which the MTF is maximum at the center of the image, it is expressed as “-” and is far from the lens 38 side. In the case of over, it is expressed as “+”, and this symbol is represented by marking 66 as information indicating the direction of the change amount of the focal length, and the actual attachment position obtained by correcting the change amount of the focal length according to the lens characteristics from the reference attachment position. As a guideline.

  When the second holding bracket 44 is attached to the first holding bracket 41 by the assembling apparatus, when adjusting the focal length (MTF) in the image height direction between the lens 38 and the image sensor 39, the input means of the assembling apparatus is used. By inputting “+” or “−”, the circuit board 46 is attached to the second holding bracket 44 by adjusting the direction from the reference attachment position of the image sensor 39 to one direction.

  Here, when adjusting the MTF, the lens 38 is assembled so that the marking 66 can be seen on the upper side. However, if the direction is different between the lens 38 and the MTF adjustment, After assembling so that the marking 65 is on the upper side, the MTF is adjusted in a direction in which the marking 66 can be seen.

  As described above, in this embodiment, the marking 66 indicates the mounting direction in which the imaging element 39 is moved in one direction in the optical axis direction from the reference mounting position with respect to the lens 38 mounted on the first holding bracket 41. Therefore, the image sensor 39 is moved at one position between the one direction and the other direction with respect to the optical axis direction so that the magnification adjustment is not required, and the image sensor 39 is placed at the actual mounting position according to the individual lens characteristics. 1 can be attached to the holding bracket 41, and the workability of the MTF adjustment work can be improved.

  The marking 66 is not limited to the direction indicating the direction during the MTF adjustment work, and the amount of displacement and the direction of the actual mounting position with respect to the reference mounting position of the image sensor 39 are marked as shown in FIG. This marking 67 indicates the amount of change in the focal length according to the characteristic of the lens set with respect to the design reference value of the focal length in the image height direction of the lens 38 and the image sensor 39 as the deviation amount and direction. You may make it represent with a numerical value.

  Specifically, when the image plane position at which the MTF is maximum at the image edge is under 0.05 mm closer to the lens 38 than the position at which the MTF is maximum at the center of the image, it is expressed as “−0.05 mm”. When the lens is over 0.05 mm from the lens 38 side, it is expressed as “+0.05 mm”, and this symbol is expressed as marking 67 as information indicating the direction of the change in focal length, and the focal point corresponding to the lens characteristics from the reference mounting position. Use this as a guideline for the actual mounting position with corrected distance variation.

  Even in this case, the imaging element 39 is moved between one direction and the other direction with respect to the optical axis direction, and the magnification adjustment operation is not necessary, and imaging is performed at the actual mounting position according to the individual lens characteristics. The element 39 can be attached to the support bracket 40 via the first holding bracket 41, and the workability of the MTF adjustment work can be improved.

Further, as shown in FIG. 13, the marking (second identification means) 68 may be constituted by a bar code in which the deviation amount and direction from the actual attachment position are written. In this case, by attaching the lens 38 based on the moving direction and the shift amount of the image sensor 39 obtained by reading the barcode, the lens 38 is moved in one direction and the other direction with respect to the optical axis direction. The image sensor 39 can be attached to the support bracket 40 via the first holding bracket 41 at the actual attachment position according to the individual lens characteristics without the need to move between and adjust the MTF. The workability of the adjustment work can be improved.
Further, by reading the bar code, information relating to the MTF adjustment work can be reflected in the assembling apparatus, and the workability of the magnification adjustment work can be further improved.

  Even in this embodiment, even when the markings 66, 67, and 68 are shielded by the traveling rail and cannot be seen from the outside, the lower marking 65 can be seen, so that the position in the normal rotation direction that satisfies the lens characteristics can be obtained. Thus, it can be surely confirmed whether or not the lens 38 is attached.

  FIG. 14 and FIG. 15 are diagrams showing a fourth embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. Note that the present embodiment is different from the first embodiment only in the lens configuration, and therefore will be described with reference to the drawings used in the first embodiment.

  In FIG. 14, markings 69 and 70 are provided on the outer periphery of the lens 38 at positions symmetrical to the optical axis direction. Note that either one of the markings 69 and 70 has a displacement direction set according to the characteristic of the lens 38 set with respect to the design reference value of the conjugate length, or a displacement direction and a displacement amount (in FIG. 14, the displacement direction is indicated). The other of the markings 69 and 70 is the mounting direction according to the lens characteristic set with respect to the design reference value of the focal length in the image height direction of the lens 38 and the image sensor 39 or the lens 38. And the amount of change in the focal length according to the lens characteristics set with respect to the design reference value of the focal length in the image height direction of the image sensor 39 is represented by a numerical value (showing the mounting direction in FIG. 14).

  In this way, the lens 38 and the image sensor 39 are moved between one direction and the other direction with respect to the optical axis direction so that the work of adjusting the magnification and the MTF is not required, and individual lens characteristics can be obtained. The lens 38 and the image sensor 39 can be attached to the support bracket 40 via the first holding bracket 41 at the corresponding actual attachment position, and the workability of the magnification adjustment work and the MTF adjustment work can be improved.

  As shown in FIG. 15, markings 71 and 72 are provided on the outer periphery of the lens 38 at positions symmetrical to the optical axis direction, and either one of the markings 71 and 72 is set with respect to the design reference value of the conjugate length. It is composed of a bar code indicating a shift direction or a shift direction and a shift amount set according to the characteristics of the lens 38 to be set, and either one of the markings 71 and 72 is used as the image height of the lens 38 and the image sensor 39. The mounting direction according to the lens characteristic set with respect to the design reference value of the focal length in the direction or the lens characteristic set with respect to the design reference value of the focal length in the image height direction of the lens 38 and the image sensor 39. You may comprise by the barcode which represented the variation | change_quantity of the focal distance according to the numerical value.

  Even in this case, the lens 38 and the image pickup device 39 are moved between one direction and the other direction with respect to the optical axis direction, so that the work of adjusting the magnification and the MTF is not required, and individual lens characteristics are obtained. The lens 38 and the image sensor 39 can be attached to the support bracket 40 via the first holding bracket 41 at the corresponding actual attachment position, and the workability of the magnification adjustment work and the MTF adjustment work can be improved.

  In addition, by reading the barcode, information relating to the magnification adjustment work can be reflected in the assembling apparatus, and the workability of the magnification adjustment work can be further improved.

  FIG. 16 is a diagram showing a fifth embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are used for the same configurations as those in the first to fourth embodiments. The description is omitted.

  FIG. 16 shows the main components of the lens 38 and the bracket 43. Protrusions (first fitting portions) 81 and protrusions (second fitting portions) 82 are provided in the vicinity of the markings 83 and 84, respectively. . The markings 83 and 84 are composed of information representing any of the information described in the first to fourth embodiments.

  In addition, a fitting groove (third fitting portion) (not shown) that fits the protrusion 81 and the protrusion 82 is provided on the upper inner peripheral surface of the bracket 43, and the lens 38 is attached to the first holding bracket 41 by the bracket 43. When mounting, either one of the protrusion 81 or the protrusion 82 is engaged with the fitting groove.

  In this way, when the lens 38 is held by the bracket 43 and attached to the first holding bracket 41, the lens 38 can be easily positioned on the first holding bracket 41 with the marking 83 or the marking 84 facing upward. In addition, information corresponding to the lens characteristics set with respect to the design reference value of the conjugate length and the design reference value of the focal length in the image height direction can be easily visually recognized from the information.

  As described above, the image reading apparatus and the image forming apparatus including the image reading apparatus according to the present invention can reliably recognize the marking even when the reading unit having a different mounting form is attached to the main body. The attachment position of the document can be confirmed from the outside, and it is possible to prevent the work efficiency of the attachment operation of the reading unit from being lowered. After the reflected light from the document is collected by the lens, the imaging is performed. It is useful as an image reading device such as a scanner device that forms an image on an element and converts it into an electrical signal, and an image forming device such as a facsimile machine, a copying machine, and a multifunction machine equipped with the image reading device.

1 is a schematic configuration diagram of an image forming apparatus according to a first embodiment of the present invention. 1 is a perspective view of a reading unit of an image forming apparatus according to a first embodiment of the present invention. 1 is a front view of a reading unit of an image forming apparatus according to a first embodiment of the present invention. FIG. 6 is a perspective view of another shape of the reading unit of the image forming apparatus according to the first embodiment of the invention. The front view of the other shape of the reading unit of the image forming apparatus according to the first embodiment of the present invention 1 is a perspective view of a lens of a reading unit of an image forming apparatus according to a first embodiment of the present invention. The perspective view of the lens of the reading unit of the image reading apparatus which concerns on the 2nd Embodiment of this invention. The perspective view of the lens from which the marking of the reading unit of the image reading apparatus which concerns on the 2nd Embodiment of this invention differs The perspective view of the lens from which the marking of the reading unit of the image reading apparatus which concerns on the 2nd Embodiment of this invention differs The perspective view of the lens of the reading unit of the image reading apparatus which concerns on the 2nd Embodiment of this invention. (A) is a figure which shows the relationship between the distance of the lens and CCD of the image reading apparatus which concerns on the 2nd Embodiment of this invention, and MTF, (b) is the under amount in the relationship between the distance of a lens and CCD, and MTF. Figure showing The perspective view of the lens from which the marking of the reading unit of the image reading apparatus which concerns on the 3rd Embodiment of this invention differs The perspective view of the lens from which the marking of the reading unit of the image reading apparatus which concerns on the 2nd Embodiment of this invention differs The perspective view of the lens of the reading unit of the image reading apparatus which concerns on the 4th Embodiment of this invention. The perspective view of the lens from which the marking of the reading unit of the image reading apparatus which concerns on the 4th Embodiment of this invention differs The principal part block diagram of the reading unit of the image reading apparatus which concerns on the 5th Embodiment of this invention. A perspective view of a conventional reading unit

Explanation of symbols

10 Copying machine (image forming device)
13 Image reading unit (image reading device)
14 Image forming unit (image forming means)
33 Reading unit 34 Light source 38 Lens 40 Support bracket (fixing means)
41 First holding bracket (fixing means)
41a Opening 43 Bracket (Fixing means)
44 Second holding bracket (fixing means)
51, 52, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71
72, 83, 84 Marking 81 Protrusion (first fitting part)
82 Protrusion (second fitting part)

Claims (14)

A lens that forms an image of reflected light reflected from the document surface after being irradiated from the light source on the imaging surface of the image sensor; and the image sensor that converts the imaged reflected light into an electrical signal; A main body of an image reading apparatus having an opening, holding the lens in a state where a part of the lens is inserted into the opening, and holding the imaging element at a predetermined distance from the lens In an image reading apparatus provided with a reading unit including a fixing means for fixing to
Provided on the outer periphery of the lens is a first identification means and a second identification means that serve as marks for the mounting position of the lens when fixing the lens to the fixing means;
The image reading apparatus according to claim 1, wherein the first identification unit and the second identification unit are provided at positions symmetrical with respect to an optical axis direction of the reflected light. The image reading apparatus according to claim 1, wherein the first identification unit and the second identification unit are identifiable in appearance. The second identification means indicates a deviation direction of an actual attachment position with respect to a reference attachment position when attaching the lens to the fixing means, and the deviation direction of the lens is set with respect to a design reference value of a conjugate length. The image reading apparatus according to claim 1, wherein an attachment direction set according to characteristics is indicated. The second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are set with respect to a design reference value of a conjugate length. The image reading apparatus according to claim 1, wherein the image reading apparatus is expressed by a numerical value corresponding to a characteristic of the lens. The second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are set with respect to a design reference value of a conjugate length. 3. The image reading apparatus according to claim 1, wherein a numerical value corresponding to a characteristic of the lens is represented by a written barcode. The second identification means indicates a deviation direction of the actual attachment position with respect to a reference attachment position of the image sensor, and the deviation direction is set with respect to a design reference value of a focal length in the image height direction of the lens and the image sensor. The image reading apparatus according to claim 1, wherein an attachment direction corresponding to a characteristic of the lens is displayed. The second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position of the image sensor, and the deviation amount and direction are design reference values of focal lengths in the image height direction of the lens and the image sensor. 3. The image reading apparatus according to claim 1, wherein the image reading apparatus is represented by a numerical value of a focal length change amount according to a characteristic of the lens set for the lens. The second identification means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position of the image sensor, and the deviation amount and direction are design reference values of focal lengths in the image height direction of the lens and the image sensor. 3. The image reading apparatus according to claim 1, wherein a numerical value of a focal length change amount corresponding to the characteristic of the lens set for is represented by a written bar code. One of the first identification means and the second identification means indicates a deviation direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation direction is a design reference value of a conjugate length. It represents a value according to the characteristics of the lens set for
The other of the first discriminating means and the second discriminating means indicates a deviation direction of the actual attachment position with respect to a reference attachment position of the image sensor, and the deviation direction is a focal length in the image height direction of the lens and the image sensor. 3. The image reading apparatus according to claim 1, wherein the image reading apparatus indicates an attachment direction corresponding to a characteristic of the lens set with respect to the design reference value. One of the first discriminating means and the second discriminating means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are conjugate lengths. It is represented by a numerical value corresponding to the characteristic of the lens set with respect to the design standard value.
The other of the first discriminating means and the second discriminating means indicates the shift amount and direction of the actual mounting position with respect to the reference mounting position of the image sensor, and the shift amount and direction indicate the image height of the lens and the image sensor. 3. The image reading apparatus according to claim 1, wherein the image reading apparatus is represented by a numerical value of a focal length change amount according to a characteristic of the lens set with respect to a design reference value of a focal length in a direction. One of the first discriminating means and the second discriminating means indicates a deviation amount and direction of an actual attachment position with respect to a reference attachment position when the lens is attached to the fixing means, and the deviation amount and direction are conjugate lengths. Represented by a bar code written with a numerical value according to the characteristics of the lens set with respect to the design reference value,
The other of the first discriminating means and the second discriminating means indicates the shift amount and direction of the actual mounting position with respect to the reference mounting position of the image sensor, and the shift amount and direction indicate the image height of the lens and the image sensor. 3. The barcode according to claim 1 or 2, wherein a numerical value of a focal length change amount corresponding to a characteristic of the lens set with respect to a design reference value of a focal length in a direction is represented by a written barcode. The image reading apparatus described. 11. One of the first identification unit and the second identification unit is set at a position where the lens can be viewed from above in the vertical direction when the lens is assembled to the fixing unit. The image reading apparatus according to claim 1. The lens has a first fitting portion in the vicinity of the first identification means, and a second fitting portion in the vicinity of the second identification means,
The said fixing | fixed means has a 3rd fitting part with which a said 1st fitting part or a said 2nd fitting part fits, when hold | maintaining the said lens. The image reading apparatus according to claim 1. An image forming apparatus comprising: an image forming unit that forms an image on a recording medium; and the image reading apparatus according to claim 1.

Images