JP2009092870A - Image reader and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader in which positioning accuracy of a mirror installed in an illuminator and a mirror for folding reflected light from an original is improved, and an image forming apparatus. <P>SOLUTION: The image reader is configured so that luminous flux emitted from a light source is deflected by a plurality of illumination mirrors 212 and 213 and an imaging area on an original surface is irradiated with the luminous flux, and the reflected light from the original surface is folded by a plurality of reading mirrors 210 and 211 so as to form an image on a one-dimensional imaging device, and performs one-dimensional image reading by scanning in a main scanning direction and performs two-dimensional image reading by scanning in a subscanning direction orthogonal to the main scanning direction. Both end sides in the main scanning direction of the illumination mirrors 212 and 213 and the reading mirrors 210 and 211 are fixed by a pair of plate-like fixing members 121a and 121b. The color of the surfaces of the fixing members 121a and 121b is set to black or a black system. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image reading apparatus and an image forming apparatus.

  2. Description of the Related Art Conventionally, in an image reading apparatus that photoelectrically reads an image of an original, a line sensor that irradiates the original with linear light extending in a one-dimensional direction and the reflected light extends in the same direction as the irradiation light. The document is transported in a direction perpendicular to the scanning direction of the line sensor while reading with.

  In this type of image reading apparatus, a cylindrical diffusion cylinder and a control plate inserted into the diffusion cylinder are provided in an illumination device that emits uniform linear diffused light or linear diffused light having a desired distribution. And adjusting the light quantity and light quantity distribution of the light source provided in the diffusion cylinder by controlling the amount of insertion of the control plate into the diffusion cylinder (see, for example, Patent Document 1) ).

  In addition, in order to improve the illumination efficiency, the light beam that has reached the vicinity of the desired irradiation area and is not used effectively is led again to the diffuse reflection part by the reflecting member before reaching the irradiation surface. In some cases, the luminance of the diffuse reflector is increased, and the light flux from the diffuse reflector is reused for illumination of a desired irradiation area (see, for example, Patent Document 2).

  In order to improve the reading accuracy, in the carriage-integrated scanning image reading apparatus, the positions of optical elements such as a reflection mirror in an off-axial optical system, an imaging mirror on which an off-axial reflection surface is formed, and a line sensor are determined. Some adjustment members are provided to adjust the position of the line sensor via the adjustment member (see, for example, Patent Document 3).

  In addition, in order to read color image information with accurate positional accuracy, a deflecting mirror (corresponding to a reading mirror) that deflects reflected light from the document, and color-separating the reflected light from the document to receive light beams of respective colors. And a multiplex dichroic mirror that separates and collects light on each pixel row through a transparent member so that the distance between the deflection mirror and the multiplex dichroic mirror is minimized (for example, patents) Reference 4).

In addition, in order to collect light from the light source with high efficiency and high density, a linear light source arranged in a circle whose center coincides with the first focal point of the ellipse, and the linear light source sandwiched therebetween Two concave reflecting members arranged opposite to each other along the major axis of the ellipse and arranged along the circumference of a circle centered on the first focal point; and a gap between edges of the two concave reflecting members; Two ellipsoidal reflecting members arranged so as to face each other, condensing the light emitted from the linear light source in a line toward the second focus of the ellipse, and reflecting the two concave reflections In some cases, the light amount and the light amount distribution are adjusted by displacing the member relative to the two ellipsoidal reflecting members (see, for example, Patent Document 5).
JP 2004-297206 A JP 2005-86391 A JP 2004-354882 A Japanese Patent Application Laid-Open No. 7-236028 JP 2005-251583 A

  However, in the conventional image reading apparatus, the position of a mirror (for example, an illumination mirror and a reflection mirror described later) installed in the illumination apparatus and a mirror (for example, a reading mirror and a deflection mirror described later) for turning back reflected light from the document There has been a problem that no consideration has been given to making the adjustment of the light amount and the light amount distribution of the illumination device unnecessary or easy due to the improvement in accuracy.

  The present invention has been made to solve the conventional problems, and an image reading apparatus and an image forming apparatus capable of improving the positional accuracy between a mirror installed in an illumination device and a mirror that turns back reflected light from a document. The purpose is to provide.

  (1) In the image reading apparatus of the present invention, a light beam emitted from a light source is deflected by a plurality of first mirrors to irradiate an imaging area of the document surface, and reflected light from the document surface is folded back by a plurality of second mirrors. An image reading apparatus that forms an image on a two-dimensional imaging device, scans in a main scanning direction to read a one-dimensional image, and scans in a sub-scanning direction orthogonal to the main scanning direction to read a two-dimensional image. Both ends of the first mirror and the second mirror in the main scanning direction are fixed with the same fixing member.

  (2) In the image reading apparatus of the present invention, the fixing member has a configuration in which the thickness of the fixing portion with the both ends is larger than the thickness other than the fixing portion.

  (3) In the image reading apparatus of the present invention, the fixing member is made of a metal material, and a bead process is performed between the fixing portion of the fixing member between the first mirror and the fixing portion of the second mirror. It has the structure which was made.

  (4) In the image reading apparatus of the present invention, as the same fixing member, a pair of plate-shaped fixing members are provided so as to face each other in the main scanning direction, One end side is connected by a plate-like connecting member extending in the main scanning direction.

  (5) In the image reading apparatus according to the present invention, the pair of plate-like fixing members is formed by a plate-like connecting member extending in the main scanning direction between the fixing portion with the first mirror and the second mirror. It has the structure connected in the middle of the fixed part.

  (6) In the image reading apparatus of the present invention, the pair of plate-like fixing members are configured such that one end side and the other end side are connected by a pair of plate-like connecting members extending in the main scanning direction. Have.

  (7) The image reading apparatus of the present invention has a configuration in which an opening is provided in one of the pair of plate-like connecting members.

  (8) In the image reading apparatus of the present invention, the plate-like fixing member and the plate-like connecting member are integrally formed.

  (9) In the image reading apparatus of the present invention, the plate-like fixing member and the plate-like connecting member are integrally formed of sheet metal.

  (10) In the image reading apparatus of the present invention, the plate-like fixing member and the plate-like connecting member are configured as a single molded component.

  (11) In the image reading apparatus of the present invention, the fixing member or the plate-like fixing member has a configuration formed in black or a black color.

  (12) An image forming apparatus according to the present invention includes: an image reading unit that reads an image of a document; and an image forming unit that forms an image read by the image reading unit on a predetermined sheet. The image reading apparatus according to any one of claims 1 to 11 is used.

  According to the present invention, by using the same fixing member for fixing the first mirror and the second mirror to the image reading device, the first mirror installed in the illumination device and the second mirror that turns back the reflected light from the document. It is possible to provide an image reading apparatus having an effect of improving the positional accuracy. Therefore, adjustment of the light quantity and light quantity distribution of the light source is unnecessary or simpler than before, and the management cost for maintenance work and the like can be reduced.

  According to the second aspect of the present invention, since the thickness (plate thickness) of the portion where the first mirror and the second mirror are fixed in the fixing member is larger than that of the other portions, the fixing member is reinforced and rigid. Can be improved, and the positional accuracy of the first mirror and the second mirror can be further increased. Further, since the increase in thickness is suitable for mass production, it can be easily carried out with a molded part superior in cost and workability.

  According to the invention of claim 3, since the fixing member is subjected to bead processing between the first mirror and the second mirror illumination mirror, the fixing member is reinforced to improve the rigidity, and the first The positional accuracy of the mirror and the second mirror can be further increased. Further, since the beat processing is suitable for small-scale production, it can be easily performed with a sheet metal part superior in cost and workability.

  According to the invention of claim 4, since the pair of plate-shaped fixing members arranged so as to face each other in the main scanning direction are connected (fixed) in the main scanning direction, the first mirror and the second mirror The positional accuracy with the illumination mirror can be further increased.

  According to the invention of claim 5, since the plate-like connecting member is provided between the fixing portion of the plate-like fixing member with the illumination mirror and the fixing portion of the reading mirror, the light from the light source is emitted from the document. It is possible to prevent the reflected light from entering the optical path. Therefore, it is possible to prevent the image reading performance from deteriorating and to make adjustment of the light quantity and light quantity distribution of the light source unnecessary or simple.

  According to the invention of claim 6, since both ends of the pair of plate-like fixing members are connected by the pair of plate-like connecting members, the first mirror fixed to the pair of plate-like fixing members. The optical path of the second mirror is surrounded by a box shape having two open surfaces. Therefore, it is possible to prevent the entry of external light that causes deterioration in image reading performance.

  According to the invention of claim 7, since the window (opening) is provided on the plate surface of the plate-like connecting member surrounding the optical paths of the first mirror and the second mirror, the first mirror and the second mirror are included. Maintenance of the internal components of the image reading apparatus can be easily performed.

  According to the invention of claim 8, since the plate-like fixing member and the plate-like connecting member are made into one component, a cheaper internal component can be provided. Further, the mounting work and the exchange work are facilitated.

  According to the ninth aspect of the present invention, since the plate-like fixing member and the plate-like connecting member are made of sheet metal, it is possible to provide an image reading apparatus that is advantageous in terms of cost and workability by small-scale production.

  According to the invention of claim 10, since the plate-like fixing member and the plate-like connecting member are formed of a mold, it is possible to provide an advantageous internal component in terms of cost and workability by small-scale production.

  According to the invention of claim 11, since the color of the plate-like fixing member and the plate-like connecting member is of a black color system, external light that causes deterioration in image reading performance is caused by the plate-like fixing member and It is possible to prevent the light from being reflected by the plate-like connecting member and entering the optical path of the first mirror and the second mirror.

  According to the twelfth aspect of the present invention, since the image reading apparatus according to any one of the first to twelfth aspects is provided as an image reading means, the image forming apparatus having the above-described effects is provided. Can be provided.

  A copying machine as an embodiment of an image reading apparatus and an image forming apparatus according to the present invention will be described below with reference to the drawings.

  Hereinafter, an image reading apparatus and an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. Here, a case where the image reading apparatus and the image forming apparatus are applied to a copying machine is shown.

  FIG. 1 is a sectional view showing the configuration of a copying machine as an embodiment of the present invention.

  In FIG. 1, a contact glass 11 (see FIG. 2) made of a translucent member is provided on the upper surface of a main body 300a of a copying machine 300.

  Further, an automatic document feeder (hereinafter also referred to as ADF) 400 is provided on the upper portion of the main body 300a. The ADF 400 can be opened and closed so as to open and close the contact glass 11 via a hinge mechanism (not shown). ing. The ADF 400 takes out the original (or original bundle) 1 placed on the original table 2 and separates them one by one, conveys them to the reading position 20, and discharges the original after being read by the image reading device 81. The paper is ejected to a paper tray 49.

  On the other hand, an image reading device 81 as a first reading unit is provided in the main body 300 a of the copying machine 300, and image information read by the image reading device 81 is transferred to the photosensitive drum 83 by the writing unit 82. Irradiated. In the sheet-through method in which the document is read by the ADF 400 while being conveyed, the image reading device 81 reads the document at the reading position 20.

  The writing unit 82 irradiates a laser beam light-modulated according to image information read by the image reading device 81, and exposes the surface of the charged photosensitive drum 83 with the laser beam.

  Around the photosensitive drum 83, a developing device 86, a transfer belt 87, a cleaning device 88, a charging device and a static eliminating device (not shown) that form an image forming unit together with the photosensitive drum 83 are provided. The charging device controls the corona discharge with a positive charge in the dark by a grid to charge the surface of the photosensitive drum to a constant potential.

  The writing unit 82 irradiates a laser beam including image information onto the photosensitive drum 83 charged at a constant potential to remove negative charges on the photosensitive drum 83 to form an electrostatic latent image.

  The developing device 86 forms a visible image by attaching a negatively charged toner to a portion of the photosensitive drum 83 from which the negative charge has been removed. A positive bias is applied to the transfer belt 87, and the transfer belt 87 transfers a negatively charged visible image onto a transfer sheet (paper) as a recording medium for conveyance.

  The cleaning device 88 is provided with a cleaning blade, and scrapes off the toner remaining on the photosensitive drum 83. The static eliminator turns on the LED to remove the residual charge on the photosensitive drum 83 and prepares to form a new image on the next transfer sheet.

  The transfer paper on which the image is formed in this manner is conveyed to the fixing device 90, and the toner image is fixed on the transfer paper by the fixing device 90.

  The main body 300a is provided with storage cassettes 91 to 95 in which transfer papers S1 to S5 of different sizes are stored. The transfer paper stored in the storage cassettes 91 to 95 is called by calling rollers 91a to 95a. After the sheets are fed, they are slidably contacted with the sheet feeding rollers 91b to 95b and the sheet feeding rollers 91b to 95b rotating in the transport direction and separated by the reverse rollers 91c to 95c rotating in the separating direction, and then the relay roller pairs 96, 97 Are conveyed to the registration roller pair 98, and timed by the registration roller pair 98 and conveyed to the conveyance path between the photosensitive drum 83 and the transfer belt 87.

  Here, the image reading device 81 will be further described. FIG. 2 is a perspective view showing a configuration of an image reading apparatus 81 as an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the configuration of the image reading apparatus 81 as an embodiment of the present invention, as seen from the front (main scanning direction).

  2 and 3, the image reading device 81 includes an illumination device 18 including a light source that illuminates a document (or document bundle) 1 on the contact glass 11 and illumination for irradiating the document 1 with light from the illumination device 18. System mirrors (reflection mirror 22, illumination mirrors 212, 213), reading system mirrors (deflection mirror 29, reading mirrors 210, 211) that reflect the light reflected from the document 1, and reflection from the reading mirror 211 An imaging lens 21 that forms an image of light on a one-dimensional imaging device 17 (for example, a CCD) and a one-dimensional imaging device 17 that converts light imaged by the imaging lens 21 into an electrical signal are provided. Then, the image reading device 81 reads an image (including characters (text), figures, photographs, etc.) displayed on the document.

  Here, the illumination device 18, the reflection mirror 22, and the deflection mirror 29 are attached to the first traveling body (first carriage) 13, and the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 are disposed on the second traveling body (first carriage). 2 carriage) 14. The first carriage 13 and the second carriage 14 receive the driving of the stepping motor 15 via a drive transmission member such as a drive transmission belt 16, and below the contact glass 11, guide rails (not shown) disposed below both side portions thereof. 1) to the left and right in FIG.

  At this time, the first carriage 13 travels twice as fast as the second carriage 14. As a result, the first carriage 13 travels while maintaining the state where the imaging position of the imaging lens 21 becomes the imaging surface of the one-dimensional imaging device 17 in the direction perpendicular to the linear imaging region 26 on the contact glass surface. Therefore, the image of the document 1 on the contact glass 11 is sequentially read out by the one-dimensional image sensor 17 to obtain a two-dimensional image. The scanning direction by the first carriage 13 is the sub-scanning direction, and the scanning direction (image reading direction) with respect to the one-dimensional image sensor 17 is the main scanning direction.

  When a CCD is used as the one-dimensional image sensor 17, the imaging lens 21 forms an image on the one-dimensional image sensor 17 by reducing the reflected light of the document with respect to the contact glass surface. Further, since the traveling speed ratio between the first carriage 13 and the second carriage 14 is set to 2: 1, the traveling distance of the second carriage 14 is half of the traveling distance of the first carriage 13 and is connected from the imaging region 26. The distance to the image lens 21 and the one-dimensional image sensor 17 is constant regardless of the positions of the first carriage 13 and the second carriage 14.

Next, the unitized lighting device 18 will be described. FIG. 4 is a plan view and a front view of an image reading apparatus 81 as an embodiment of the present invention.
Here, (a) is a view as seen from the contact glass side with the illumination device 18 attached to the image reading device 81, and shows the illumination state in the main scanning direction. FIG. 7B is a view as seen from the front (operation side) of the copying machine 300 in the above state, and shows an illumination state in the sub-scanning direction. (C) is a view of the illumination device 18 as another embodiment as viewed from the front (operation side) of the copying machine 300 in the above state. FIG. 6D is a view of the illumination device 18 as still another embodiment as viewed from the front (operation side) of the copying machine 300 in the above state. Therefore, the lighting device 18 is configured by combining (a) and (b), combining (a) and (c), or combining (a) and (d). Can do.

  4A, the illuminating device 18 includes an LED array 202 composed of a plurality of light emitting diodes, a rotating paraboloid mirror 201 for reflecting light beams emitted from the LEDs into parallel light, and a main condenser lens. 203, a main illumination lens 204, a main integration lens 205, and a sub illumination lens 206.

  The LED array 202 uses LEDs of three colors of R (red), G (green), and B (blue). Although only four are shown here, it is sufficient that there are at least three, one for each color, and even an integer multiple thereof may be used to increase only the colors with a small amount of emitted light in consideration of the color balance.

  The paraboloid mirror 201 reflects the luminous flux emitted from the LEDs of the LED array 202 arranged at the focal position into parallel light. However, since the light emitting surface of the LED has a certain area rather than a point, the luminous flux emitted from other than the focal position diverges from the parallel light and diverges and deviates from the parallel light as the focal point shifts (see FIG. 17).

  The main condensing lens 203 is a cylinder (lens) array for efficiently entering parallel light including divergent light into the main illumination lens 204. The shape of the main condensing lens 203 is the same type as that of the main illumination lens 204, and the focal length is preferably “f1 = c”, but is not limited thereto, and may be the same as the main illumination lens 204 (f1 = f2). . Note that, by forming the main condenser lens 203 and the main illumination lens 204 in the same manner, the management burden such as during manufacturing, sales, and service is reduced.

  The main illumination lens 204 is a cylinder (lens) array that illuminates the irradiation target surface (reading region) by expanding a light beam that has been converted into parallel light by the rotary parabolic mirror 201. The main illumination lens 204 has a shape in which cylinders (lenses) are arranged so that the main condenser lens 203 faces the non-concave surface. The focal length of the main illumination lens 204 is preferably “f2 = 1 / ((1 / a) + (1 / c))”.

  The main integrated lens 205 matches the sub optical axis of the light beam divided by the main condenser lens 203 and the main illumination lens 204 with the center of the illumination target surface, and the light beam illuminated by each cylinder of the main illumination lens 204 is the illumination target. Superimpose on the surface. The focal length of the main integrated lens 205 is F = a. The main integrated lens 205 has a shape obtained by cutting an unnecessary portion of a general circular convex lens in the sub-scanning direction.

  With the above-described configuration, all the light beams that pass through the cylinder (lens) having the width m, which are the elements of the cylinder (lens) array in the main condenser lens 203 and the main illumination lens 204, are areas of the width M in the reading area of the illumination target surface. The inside will be irradiated. In this case, if the number of LEDs does not match the number of cylinders in the cylinder array, the illumination target surface can be made uniform except for the influence of the profile formed by the LEDs and the rotary parabolic mirror 201. . However, when the number of cylinders exceeds twice the number of LEDs, it may be an integer multiple.

  As shown in FIG. 4B, the luminous flux generated by the LED of the LED array 202 is reflected by the paraboloid mirror 201 and becomes parallel light as described above. However, when viewed from the front, the light transmitted through the main condensing lens 203 and the main illumination lens 204 behaves in the same way as there are parallel plates, and therefore passes through the parallel light without being influenced here. The parallel light beam is focused by the main integrated lens 205 and focused on the illumination target surface. However, the divergent light beam described above deviates from the focal position and irradiates the illumination target surface. The illuminance distribution reflects the light distribution shown in FIG. Here, in consideration of the half-value width of the light distribution, for example, an area having a width M ′ may be irradiated.

  This is because the size of the luminous body having an area is the ratio of the F value “f (PR)” of the rotary parabolic mirror 201 to the focal length f (L) of the main integrated lens 205, “f (L) / f ( PR) ”is magnified by a factor of 2 to form an image on the surface to be illuminated. Here, since the ratio is several tens to one hundred times, the image of the LED chip of zero millimeters square is projected to a size of several centimeters. In this direction (sub-scanning direction), it is several tens. It can be seen that only a fractional to one-hundredth efficiency can be obtained.

  In FIG. 4C, the lens L in the main integrated lens 205 is changed to a cylinder in order to improve the efficiency. The main scanning direction has the same curvature as the focal length of the lens L, and the sub-scanning direction is a straight cylinder (lens). In FIG. 4C, a converging lens 208 is provided. The converging lens 208 is a cylinder (lens) that is separated from the main integrated lens 205 and has a condensing function in the sub-scanning direction and is disposed near the illumination target surface. The focal length of the focusing lens 208 is “f (CL2) = a ′”. Of course, this part is removed from the inside of the lighting unit.

  According to the configuration described above, the light beam emitted from the rotary parabolic mirror 201 reaches the focusing lens 208 while remaining as a parallel light beam (including a divergent light beam), and the above-described LED chip image enlargement ratio is “a ′”. / F (PR) "and is suppressed to several times. That is, the efficiency is improved by an order of magnitude from the configuration shown in FIG.

  In FIG. 4D, a sub illumination lens 207 (corresponding to 206 in FIG. 4A) is provided to further improve the efficiency. The sub-illumination lens 207 is arranged so as to have a positional relationship such that the image of the LED is formed at the position of the focusing lens 208, and the focal length thereof is “f (CL3) = 1 / (1 / a”) + ( 1 / b ")" cylinder (lens). Here, the distance b ″ is a distance from the LED of the LED array 202 to the sub illumination lens 207.

  It is effective to set the focal length “f (CL2) = 1 / (1 / a ′) + (1 / a ″)” of the focusing lens 208. On the other hand, when “f = a” ”, the efficiency is slightly lowered, but the efficiency is improved as compared with the configuration of FIG.

  More specifically, as a result of the experiment, an efficiency improvement of about 50% was recognized in the configuration of FIG. 4D compared to the configuration of FIG.

  Next, main optical components in the illumination device 18 will be described. FIG. 5 is a perspective view of main optical components of the illumination device 18 as one embodiment of the present invention.

  5A is a perspective view of the main condensing lens 203 and the main illumination lens 204, and a plurality of plano-convex portions 222 are arranged in parallel on the flat plate portion 221. FIG. (B) is a perspective view of the sub illumination lens 207, which is a plano-convex cylinder (lens). (C) is a perspective view of the main integrated lens 205, and (d) is a perspective view of the focusing lens 208. (E) is a perspective view of the focusing mirror 225 when the function of the focusing lens 208 is changed from a lens to a reflecting mirror. (F) is a perspective view of the main integrated Fresnel lens 226 when the main integrated lens 205 is made into a Fresnel lens. When the cylinder shown in (c) is formed into a Fresnel lens, a partial range 227 of the main integrated Fresnel lens 226 is used.

  Here, as shown in FIG. 5 (f), by increasing the main integrated lens 205 to a Fresnel lens, it is possible to suppress an increase in lens weight with respect to an increase in size of the main integrated lens 205. Therefore, it is possible to avoid the high-speed movement being hindered by the inertial force when the lighting device 18 is mounted on the traveling body and moved. The main integrated lens 205 increases in size as the number of light emitting diodes arranged in the main scanning direction increases, and the width and thickness (in the main optical axis direction) increase, leading to an increase in lens weight.

  Next, the necessary range (width) of the deflection mirror (for example, the reading mirrors 210 and 211 and the illumination mirrors 212 and 213) will be described. FIG. 6 is a diagram for explaining the width of the deflection mirror in the image reading apparatus 81 as an embodiment of the present invention. Here, (a) shows the deflection mirror position and width in the image reading system (from the document surface to the imaging lens 21). (B) shows the deflection mirror position and width in the illumination system (from the LED array 202 to the original surface).

  In this embodiment, since there is a distance of several tens of centimeters from the document surface to the reading unit such as the one-dimensional imaging device 17 and the imaging lens 21 or from the illumination unit such as the illumination device 18 to the document surface, image reading is performed. In order to make the device 81 compact, the optical path is bent or folded by a plurality of mirrors such as a deflection mirror. In this case, the required width varies depending on the arrangement of the mirrors.

  In FIG. 6A, the distance from the imaging lens 21 to the document surface is a distance LN. The diameter D of the imaging lens 21, the width MM2 required at the deflection mirror position close to the imaging lens 21 (distance LM from the document surface), and the width MM1 required at the deflection mirror position close to the document surface are “ The relationship is “diameter D> width MM2> width MM1”. In the reading system, the deflection mirror position closer to the document surface is narrower and needs to be wider as it approaches the imaging lens 21. In the reading system, the size of the reading area in the sub-scanning direction is several tens of microns. Therefore, in FIG. 6A, when this is ignored, the reading area is viewed as a similar triangle having the base of the aperture of the imaging lens 21. Is shown.

  In FIG. 6B, the distance LO is separated from the main integrated lens 205 to the deflection mirror position close to the main integrated lens 205. The main integration lens 205 is spaced from the main integration lens 205 by a distance LP from the position of the distant mirror. In the illumination system, the diameter L of the main integrated lens 205, the width MM2 required at the position of the deflecting mirror close to the main integrated lens 205 (distance LO from the main integrated lens 205), and the position of the deflecting mirror far from the main integrated lens 205. The relationship of “diameter L <width MM2 <width MM1” with the width MM1 required for (the distance LP from the main integrated lens 205). Here, the position of the deflecting mirror near the main integrated lens 205 is narrower and needs to be wider as the distance from the main integrated lens 205 increases. Of course, this is not the case unless the luminous flux is used efficiently. FIG. 6B corresponds to FIG. 4C, but a portion that diverges at a divergence angle θL is further added to the opening of the illumination unit.

  Next, a fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 7 is a perspective view showing a fixing mechanism for a reading mirror and an illumination mirror as an embodiment of the present invention.

In FIG. 7, the fixing mechanism has a pair of plate-like fixing members 121a and 121b arranged to face each other across the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213. The plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. The mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 that are long in the main scanning direction are perpendicular to the plate surface. Furthermore, the surfaces of the fixing members 121a and 121b are black or black.
In the present embodiment, the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 are both fixed to the second traveling body 14 by the same fixing members 121a and 121b. Kept. Therefore, adjustment of the light quantity and light quantity distribution of the illumination device 18 can be made unnecessary or simplified. Further, since the surface color of the fixing members 121a and 121b is a black color system, external light that causes deterioration in image reading performance is reflected on the fixing members 121a and 121b, and the reading mirrors 210 and 211 and the illumination mirror 212, It is possible to prevent the light from entering the optical path 213 easily.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 8 is a perspective view showing a fixing mechanism of a reading mirror and an illumination mirror as another embodiment (second embodiment) of the present invention.

  In FIG. 8, the fixing mechanism includes a pair of plate-like fixing members 121 a and 121 b that are disposed to face each other with the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 interposed therebetween, and fixing points on the fixing members 121 a and 121 b And two pairs of reinforcing members 122a to 122d having a smaller area than the fixing member. The plate surfaces of the reinforcing members 122a to 122d are perpendicular to the main scanning direction and parallel to the sub-scanning direction. The mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 that are long in the main scanning direction are perpendicular to the plate surface. Further, the surfaces of the reinforcing members 122a to 122d are black or black.

  In the present embodiment, the reading mirror 210 and the illumination mirror 212 are fixed to the second traveling body 14 by the same fixing members 121a and 121b and the reinforcing members 122a and 122c, and the reading mirror 211 and the illumination mirror 213 are the same. Since both end sides are fixed to the second traveling body 14 by the fixing members 121a and 121b and the reinforcing members 122b and 122d, the thicknesses of the fixing portions of the reading mirror 210 and the illumination mirror 212 in the fixing members 121a and 121b are increased. Compared with one embodiment (see FIG. 7), the rigidity is improved. Therefore, since the positional accuracy of both mirrors is kept better, adjustment of the light quantity and light quantity distribution of the illumination device 18 can be made unnecessary or simplified. Further, since the surface colors of the fixing members 121a and 121b and the reinforcing members 122b and 122d are black, external light that causes deterioration in image reading performance is reflected to the fixing members 121a and 121b and the reinforcing members 122b and 122d. Thus, it is possible to prevent the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 from entering easily.

  The fixing members 121a and 121b and the reinforcing members 122b and 122d may be integrally formed so that the thicknesses of the fixing portions of the reading mirror 210 and the illumination mirror 212 in the fixing members 121a and 121b are increased. . In this case, the attaching (fixing) operation and the removing operation of the reading mirror 210 and the illumination mirror 212 with respect to the second traveling body 14 are facilitated.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 9 is a perspective view showing a fixing mechanism of a reading mirror and an illumination mirror as another embodiment (third embodiment) of the present invention.

  In FIG. 9, the fixing mechanism has a pair of plate-like fixing members 121a and 121b arranged to face each other with the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 interposed therebetween. In the vicinity of the fixing position of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 on the fixing members 121a and 121b (for example, between one end surface of the reading mirror 210 and one end surface of the adjacent illumination mirror 212, one end surface of the reading mirror 211 Between the one end surface of the illumination mirror 213 and the adjacent illumination mirror 213). The beads 141a and 141b extend in a direction substantially perpendicular to the mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213. As described above, the plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. The mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 that are long in the main scanning direction are perpendicular to the plate surface. Furthermore, the surfaces of the fixing members 121a and 121b on which the convex beads 141a and 141b are formed are black or black.

  In the present embodiment, the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 are fixed to the second traveling body 14 at both ends by the same fixing members 121a and 121b subjected to bead processing. The rigidity of the fixing members 121a and 121b is improved as compared with one embodiment (see FIG. 7). Therefore, since the positional accuracy of both mirrors is kept better, adjustment of the light quantity and light quantity distribution of the illumination device 18 can be made unnecessary or simplified. In addition, since the surface of the fixing members 121a and 121b subjected to bead processing is a black color system, external light that causes deterioration in image reading performance is reflected on the fixing members 121a and 121b, and the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 can be prevented from easily entering the optical path. Note that since the bead treatment is limited to a metal material, the fixing members 121a and 121b are formed of a metal material in the present embodiment.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 10 is a perspective view showing a fixing mechanism for a reading mirror and an illumination mirror as another embodiment (fourth embodiment) of the present invention.

  In FIG. 10, the fixing mechanism includes a pair of plate-like fixing members 121 a and 121 b disposed to face each other with the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 interposed therebetween, and the fixing member 121 a across the optical path. , 121b, and a plate-like connecting member 151a that connects one end of each other (lower ends in the figure). One end surface of the connecting member 151a is connected to one end surface of the fixing member 121a, the other end surface of the connecting member 151a is connected to one end surface of the fixing member 121b, and plate surfaces (three surfaces) of the fixing members 121a and 121b and the connecting member 151a. The light path is surrounded by a U-shape.

  As described above, the plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. Further, the mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 that are long in the main scanning direction and the plate surface of the connecting member 151a are perpendicular to the plate surfaces of the fixing members 121a and 121b. The surfaces of the fixing members 121a and 121b and the connecting member 151a are black or black.

  In the present embodiment, since the fixing members 121a and 121b are connected at one end surfaces by the connecting member 151a, the fixing mechanism has improved rigidity compared to the above-described embodiment (see FIG. 7), and the fixing members 121a and 121b are fixed. The positional relationship of the members 121a and 121b in the main scanning direction is firmly maintained (positional accuracy is kept good). Accordingly, the positional accuracy of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 is further improved, and the adjustment of the light amount and the light amount distribution of the lighting device 18 can be made unnecessary or simplified. .

  Further, the surface color of the fixing members 121a and 121b and the connecting member 151a is a black system, and the reading mirrors 210 and 211 and the illumination are provided by the plate surfaces of the fixing members 121a and 121b and the connecting member 151a arranged in a U-shape. Since the optical paths of the mirrors 212 and 213 are surrounded, external light that causes deterioration of image reading performance is prevented from being reflected on the fixing members 121a and 121b and the connecting member 151a and easily entering the optical path. be able to.

Not limited to the present embodiment, the fixing members 121a and 121b and the connecting member 151a may be integrally formed as one part having a U-shaped cross section. In this case, for example, even if it is produced in a small quantity as a sheet metal part or mass-produced as a molded part, it is advantageous in terms of cost and can be implemented in any case.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 11 is a perspective view showing a fixing mechanism of a reading mirror and an illumination mirror as another embodiment (fifth embodiment) of the present invention.

  In FIG. 11, the fixing mechanism includes a pair of plate-like fixing members 121 a and 121 b arranged to face each other with the optical paths of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 interposed therebetween, and the fixing member 121 a across the optical path. , 121b, a plate-like connecting member 151a that connects one end (the lower ends in the drawing), and a plate-like connection member that connects the other ends of the fixing members 121a, 121b (the upper ends in the drawing) across the optical path. And a connecting member 151b. One end surface of the connecting member 151a is connected to one end surface of the fixing member 121a, and the other end surface of the connecting member 151a is connected to one end surface of the fixing member 121b. One end surface of the connecting member 151b is connected to the other end surface of the fixing member 121a, and the other end surface of the connecting member 151a is connected to the other end surface of the fixing member 121b. The fixing mechanism surrounds the optical path in a box-like shape (cylinder shape having a square cross section) by the plate surfaces (four surfaces) of the fixing members 121a and 121b and the connecting members 151a and 151b.

  As described above, the plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. Further, the mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 that are long in the main scanning direction and the plate surfaces of the connecting members 151a and 151b are perpendicular to the plate surfaces of the fixing members 121a and 121b. The surfaces of the fixing members 121a and 121b and the connecting members 151a and 151b are black or black.

  In the present embodiment, since the fixing members 121a and 121b are connected at the two end faces by the connecting members 151a and 151b, the rigidity of the fixing mechanism is improved as compared with the above-described embodiment (see FIG. 7). The positional relationship between the fixing members 121a and 121b in the main scanning direction is firmly maintained (position accuracy is kept good). Accordingly, the positional accuracy of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 is further improved, and the adjustment of the light amount and the light amount distribution of the lighting device 18 can be made unnecessary or simplified. .

  The surface of the fixing members 121a and 121b and the connecting members 151a and 151b is a black color system, and the reading mirrors 210 and 211 and the illumination mirror are formed by the fixing members 121a and 121b and the connecting members 151a and 151b formed in a box shape. Since the optical paths 212 and 213 are surrounded, external light that causes deterioration in image reading performance is reflected by the fixing members 121a and 121b and the connecting members 151a and 151b and easily enters the optical path. Can be prevented.

  Note that the present invention is not limited to this embodiment, and the fixing members 121a and 121b and the connecting members 151a and 151b may be integrally formed as one component. In this case, for example, small production as a sheet metal part or mass production as a mold part is advantageous in terms of cost and can be carried out either way.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIG. 12 is a perspective view showing a fixing mechanism of a reading mirror and an illumination mirror as another embodiment (sixth embodiment) of the present invention.

  In FIG. 12, the fixing mechanism includes a pair of plate-like fixing members 121a and 121b, a plate-like connecting member 151a, and a plate-like connecting member 151b as in the above-described embodiment (see FIG. 11). It is the structure which has these. Further, the fixing mechanism surrounds the optical path in a box shape (cylinder shape having a rectangular cross section) by the plate surfaces (four surfaces) of the fixing members 121a and 121b and the connecting members 151a and 151b. Further, the connecting member 151b is provided with a rectangular window-shaped opening 151d.

  As described above, the plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. The mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 and the plate surfaces of the connecting members 151a and 151b are perpendicular to the plate surfaces of the fixing members 121a and 121b. Furthermore, the opening 151d has a size that allows maintenance of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213. The surfaces of the fixing members 121a and 121b and the connecting members 151a and 151b are black or black.

  In the present embodiment, since the fixing members 121a and 121b are connected at the two end faces by the connecting members 151a and 151b, the rigidity of the fixing mechanism is improved as compared with the above-described embodiment (see FIG. 7). The positional relationship between the fixing members 121a and 121b in the main scanning direction is firmly maintained (position accuracy is kept good). Accordingly, the positional accuracy of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 is further improved, and the adjustment of the light amount and the light amount distribution of the lighting device 18 can be made unnecessary or simplified. .

  The surface of the fixing members 121a and 121b and the connecting members 151a and 151b is a black color system, and the reading mirrors 210 and 211 and the illumination mirror are formed by the fixing members 121a and 121b and the connecting members 151a and 151b formed in a box shape. Since the optical paths 212 and 213 are surrounded, the external light that causes the deterioration of the image reading performance is reflected on the fixing members 121a and 121b and the connecting members 151a and 151b except for the opening 151d. Easy entry into the optical path can be prevented.

  Furthermore, the provision of the opening 151d facilitates maintenance work for internal components including the reading mirrors 210 and 211 and the illumination mirrors 212 and 213. Therefore, it is expected that the time required for the maintenance work is shortened and the work cost is reduced.

  Note that the present invention is not limited to this embodiment, and the fixing members 121a and 121b and the connecting members 151a and 151b may be integrally formed as one component. In this case, for example, small production as a sheet metal part or mass production as a mold part is advantageous in terms of cost and can be carried out either way.

  Next, another configuration of the fixing mechanism for fixing the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 to the second traveling body 14 will be described. FIGS. 13 and 14 are a front view and a perspective view showing a fixing mechanism for a reading mirror and an illumination mirror as another embodiment (seventh embodiment) of the present invention.

  13 and 14, the fixing mechanism includes a pair of plate-like fixing members 121 a and 121 b arranged to face each other across the optical path of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213, and straddling the optical path. And a plate-like connecting member 151c that connects the plate surfaces of the fixing members 121a and 121b (the lower end side in the figure). The connecting portion of the fixing members 121a and 121b by the connecting member 151c is between the reading mirror 211 and the illumination mirror 213 fixed by the fixing members 121a and 121b. The width (length in the non-long direction) of the connecting member 151c is set to be narrower than the widths of the fixing members 121a and 121b so as not to obstruct the optical paths of the reading mirror 211 and the illumination mirror 213.

  As described above, the plate surfaces of the fixing members 121a and 121b are perpendicular to the main scanning direction and parallel to the sub-scanning direction. The mirror surfaces of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 and the plate surface of the connecting member 151c are perpendicular to the plate surfaces of the fixing members 121a and 121b. Further, the plate surface of the connecting member 151 c is perpendicular to the mirror surfaces of the reading mirror 211 and the illumination mirror 213. Further, the surfaces of the fixing members 121a and 121b and the connecting member 151c are black or black.

  In the present embodiment, since the fixing members 121a and 121b are connected at one place on the plate surface by the connecting member 151c, the rigidity of the fixing mechanism is improved as compared with the above-described embodiment (see FIG. 7). In addition, the positional relationship between the fixing members 121a and 121b in the main scanning direction is firmly maintained (positional accuracy is kept good). Therefore, the positional accuracy of the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 is kept good, and the adjustment of the light quantity and light quantity distribution of the illumination device 18 can be made unnecessary or simplified.

  Further, since the surface colors of the fixing members 121a and 121b and the connecting member 151c are black, external light that causes deterioration in image reading performance is reflected on the fixing members 121a and 121b and the connecting members 151a and 151b. It is possible to prevent easy entry into the optical path of the reading system and the illumination system.

  Further, since the connecting portion is between the reading mirror 211 and the illumination mirror 213 fixed by the fixing members 121a and 121b, the light from the illumination device 18 of the illumination system reflects the reflected light from the document surface. It is possible to prevent entry into the optical path (reading system optical path).

  Note that the fixing members 121a and 121b and the connecting member 151c may be integrally formed as one component, not limited to the present embodiment. In this case, for example, small production as a sheet metal part or mass production as a mold part is advantageous in terms of cost and can be carried out either way.

  In the above-described embodiments (first to seventh embodiments), the case where the reading mirrors 210 and 211 and the illumination mirrors 212 and 213 are fixed to the second traveling body 14 has been shown. The present invention can also be applied to the case where the deflection mirror 29 and the reflection mirror 22 are fixed to the first traveling body 13. In this case, the positional accuracy of the deflection mirror 29 and the reflection mirror 22 is kept good, and the adjustment of the light quantity and light quantity distribution of the illumination device 18 is unnecessary or can be simplified. Moreover, the other effect mentioned above can also be obtained.

  Next, another configuration of the lighting device 18 will be described. FIG. 15 is a plan view of an image reading apparatus 81 as another embodiment (eighth embodiment) of the present invention. This is obtained by arranging three columns in FIG. 4D in the sub-scanning direction. In the present embodiment, it is assumed that CCDs (corresponding to the one-dimensional imaging device 17) that read an image for each of R, G, and B colors and change them into electrical signals are arranged in three rows in the sub-scanning direction.

15A is a view as seen from the contact glass side in a state where the illumination device 18 is mounted on the image reading device 81, and shows an illumination state in the main scanning direction. FIG. 7B is a view as seen from the front (operation side) of the copying machine 300 in the above state, and shows an illumination state in the sub-scanning direction.
As shown in FIG. 15A, since the optical axis (main optical axis) in the main scanning direction and the optical axis (sub optical axis) of the reading system are deviated, competition with the focusing lens 208 in that direction is avoided. be able to.

  As shown in FIG. 15B, the LED array 202 is arranged for each of R, G, and B colors in the sub-scanning direction, and irradiates the reading area on the document surface for each of R, G, and B colors. ing.

  The sub illumination lens 206 is a cylinder (lens) array in which three cylinders having a focal length “f = b” ”are arranged.

  The sub-integrated lens 207 is a cylinder (lens) having a focal length “f = a” ”, and makes the optical axis of each cylinder of the sub-illumination lens 206 coincide on the main illumination lens 204.

  Here, the combined focal length of the sub illumination lens 206 and the sub integrated lens 207 is the same focal length “f = 1 / (1 / a”) + (1 / b ")". However, the distance b ″ is so small that it can be ignored.

  According to the present embodiment, the illuminance distribution in the sub-scanning direction of the reading area on the original surface can be shifted as shown in FIG. 17B for the illuminance distribution for each of R, G, and B colors. Furthermore, when the peak position for each color is relatively matched with the position of the 3-line CCD, the luminous flux of the illumination system can be used most efficiently. On the other hand, when a three-line CCD is used to obtain a color image, if the peak position of one color is relatively matched with the position of the three-line CCD as shown in FIG. Reads the position where the amount of light has decreased.

  In the present embodiment, the same effects can be obtained by applying the other embodiments (first to seventh embodiments) described above.

  Next, another configuration of the image reading device 81 will be described. FIG. 18 is a plan view of an image reading apparatus 81 according to another embodiment (9th embodiment) of the present invention, and shows a configuration for avoiding direct reflected light from the contact glass 11.

  As shown in FIG. 18A, the image reading apparatus 81 according to the present embodiment has a first illumination unit 218b and a second illumination unit 218a. Both of the lighting units 218a and 218b apply any one of the first to eighth embodiments described above. Here, the main optical axes of the illumination units 218a and 218b (centers of the main integrated lenses 205a and 205b) are in the reading region on the opposite side across the main optical axis of the reading unit 219 (main optical axis of the imaging lens 21). It is adjusted to 1/4 position. The reading area illuminated by the first illumination unit 218b or the second illumination unit 218a is half of the entire area, and the entire reading area is illuminated by both illumination units 218a and 218b.

  As shown in FIG. 18B, when the main optical axes coincide with each other in both the main scanning direction and the sub-scanning direction, the light of the two illumination units is regularly reflected on the surface of the contact glass 11 and directly formed into the imaging lens 21. Therefore, white streaks are superimposed on the read image. Accordingly, white streaks are generated by the number of LEDs in the LED array 202.

  On the other hand, according to the present embodiment, the main optical axes of the illumination units 218a and 218b are aligned with the reading regions on the opposite side, so that the reflected light from the contact glass 11 directly enters the imaging lens 21. Can be avoided while keeping the sub-scanning direction coincident, and the light beam from any LED in the LED array 202 of the illumination units 218a and 218b does not enter the imaging lens 21.

  In each of the above-described embodiments, the present invention is applied to a copying machine. However, the present invention is not limited to this. The present invention can also be applied to image reading apparatuses and image forming apparatuses such as facsimile machines, multifunction machines, and printers. .

1 is a cross-sectional view of a copying machine as a first embodiment of the present invention. 1 is a perspective view of an image reading apparatus as a first embodiment of the present invention. 1 is a cross-sectional view of an image reading apparatus as a first embodiment of the present invention. 1A and 1B are a plan view and a front view of an image reading apparatus as a first embodiment of the present invention. It is a perspective view of the optical component in the illuminating device as the 1st Embodiment of this invention. It is a figure explaining the width size of the deflection | deviation mirror in the image reading apparatus as the 1st Embodiment of this invention. 1 is a perspective view of an illumination mirror and a reading mirror fixing mechanism in an image reading apparatus as a first embodiment of the present invention. FIG. 6 is a perspective view of an illumination mirror and a fixing mechanism of a reading mirror in an image reading apparatus as a second embodiment of the present invention. FIG. 10 is a perspective view of an illumination mirror and a fixing mechanism of a reading mirror in an image reading apparatus as a third embodiment of the present invention. It is a perspective view of the fixing mechanism of the illumination mirror and the reading mirror in the image reading apparatus as the fourth embodiment of the present invention. It is a perspective view of the fixing mechanism of the illumination mirror and the reading mirror in the image reading apparatus as the fifth embodiment of the present invention. It is a perspective view of the fixing mechanism of the illumination mirror and the reading mirror in the image reading apparatus as the sixth embodiment of the present invention. It is a front view of the fixing mechanism of the illumination mirror and the reading mirror in the image reading apparatus as the seventh embodiment of the present invention. It is a perspective view of the fixing mechanism of the illumination mirror and the reading mirror in the image reading apparatus as the seventh embodiment of the present invention. It is a top view of the image reading apparatus as the 8th Embodiment of this invention. It is a figure which shows the light distribution characteristic of the light beam from the LED array as one Embodiment of this invention. It is a figure which shows the illumination intensity distribution model of the subscanning direction of the image reading apparatus as the 8th Embodiment of this invention. It is a top view of the image reading apparatus as the 9th Embodiment of this invention.

Explanation of symbols

1 Document 11 Contact Glass 13 First Traveling Body (First Carriage)
14 Second traveling body (second carriage)
15 Stepping motor 16 Drive transmission belt (drive transmission member)
17 One-dimensional image sensor 18 Illumination device (illumination unit)
21 Imaging lens 22 Reflecting mirror (first mirror)
26 Imaging area 29 Deflection mirror (second mirror)
121a, 121b fixing member (plate-like fixing member)
122a-122d Reinforcing member (fixed part)
141a, 141b Beat members 151a, 151b, 151c Connecting members (plate-like connecting members)
151d Window (opening)
201 Rotating parabolic mirror (PR)
202 LED array 203 Main condenser lens (CA1)
204 Main illumination lens (CA2)
205 Main integrated lens (L (CL1))
206 Sub illumination lens (CA4)
207 Sub illumination lens (CL3)
208 Focusing lens (CL2)
209 Sub-integrated lens (CL4)
210, 211 Reading mirror (second mirror)
212, 213 Illumination mirror (first mirror)
218a First illumination unit 218b Second illumination unit 219 Reading unit

Claims (12)

A one-dimensional imaging element is configured such that a light beam emitted from a light source is deflected by a plurality of first mirrors (illumination mirrors) to irradiate an imaging region on a document surface, and reflected light from the document surface is folded by a plurality of second mirrors (reading mirrors) In an image reading apparatus that scans in the main scanning direction and performs one-dimensional image reading, scans in the sub-scanning direction orthogonal to the main scanning direction, and performs two-dimensional image reading.
An image reading apparatus, wherein both ends of the first mirror and the second mirror in the main scanning direction are fixed by the same fixing member.   The image reading apparatus according to claim 1, wherein a thickness of the fixing portion between the both ends of the fixing member is larger than a thickness other than the fixing portion.   2. The fixing member according to claim 1, wherein the fixing member is made of a metal material, and a bead process is performed between the fixing portion of the fixing member with the first mirror and the fixing portion of the second mirror. Image reading apparatus.   As the same fixing member, a pair of plate-like fixing members are provided so as to face each other in the main scanning direction, and the pair of plate-like fixing members is formed by a plate-like connecting member extending in the main scanning direction. The image reading apparatus according to claim 1, wherein one end side is connected.   The pair of plate-like fixing members is connected between a fixing portion with the first mirror and a fixing portion with the second mirror by a plate-like connecting member extending in the main scanning direction. The image reading apparatus according to any one of claims 1 to 3.   The pair of plate-like fixing members are connected at one end side and the other end side by a pair of plate-like connecting members extending in the main scanning direction. The image reading apparatus according to claim 1.   The image reading apparatus according to claim 6, wherein an opening is provided in one of the pair of plate-like connecting members.   The image reading apparatus according to claim 4, wherein the plate-like fixing member and the plate-like connecting member are integrally formed.   The image reading apparatus according to claim 8, wherein the plate-like fixing member and the plate-like connecting member are integrally formed of a sheet metal.   The image reading apparatus according to claim 8, wherein the plate-like fixing member and the plate-like connecting member are formed as a single molded part.   The image reading apparatus according to claim 1, wherein the fixing member or the plate-like fixing member is formed in a black or black color. Image reading means for reading an image of a document; and image forming means for forming an image read by the image reading means on a predetermined sheet,
An image forming apparatus using the image reading apparatus according to claim 1 as the image reading unit for reading.

Images