JP2009273000A - Image sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact image sensor in a plate shape wherein a casing illuminating an object to be irradiated and a casing for image-forming optical information incident from the object to be irradiated can be separated. <P>SOLUTION: An image sensor includes: a light source which radiates light over a main scanning direction; a light transmission body to which light from the light source is made incident, and which transmits the light in a sub scanning direction and irradiates an irradiation part of an object to be irradiated with light fully reflected on an emission surface; an image forming means comprising a lens for converging scattered light of light reflected on the object to be irradiated; a light receiving section for receiving light converged by the image forming means; and a casing housing or holding the light source, the light transmission body, the image forming means and the light receiving section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image sensor used for image reading and image identification such as a copying machine and a financial terminal device.

  As an image sensor that reads image information, for example, Japanese Patent Laid-Open No. 2-177761 FIG. 1 (see Patent Document 1) includes a chassis 51 that supports an LED array 3, a rod lens array 5, and a sensor module 40 on each surface; An optical sensor device fixed to each other by a chassis 52 configured to cover the chassis 51 is disclosed.

1 (see Patent Document 2), there are two inclined surface portions 16a having different inclination angles at the intermediate portion in the height direction of the irradiation optical path 14 sandwiched between two inner wall surfaces 15a and 15b. , 16b, which are located above the LED chip 6 and approach the image reading region S as they are on the upper side, are disclosed.
FIG. 2 (see Patent Document 3) of Japanese Patent Laid-Open No. 11-8742 discloses a reading apparatus that forms an image of a read image of a document 10 illuminated by a light source 11 with a first mirror array 13 and a second mirror array 14. Is disclosed.

  Japanese Patent Laid-Open No. 10-290336 discloses an image reading apparatus in which a reflection illumination unit 18, a reflection original imaging lens 23, and a solid-state image sensor 24 are incorporated in an image reading apparatus main body. Has been.

JP-A-2-177761 (FIG. 1)

JP 11-215301 A (FIG. 1) [paragraph 0035]

Japanese Patent Laid-Open No. 11-8742 (FIG. 2)

Japanese Patent Laid-Open No. 10-290336 (FIG. 1)

  However, in the device described in Patent Document 1, the LED array 3, the rod lens array 5, and the sensor module 40 are supported on the chassis 51 whose surfaces are processed. Therefore, the illumination optical system, the rod lens array, and the sensor module by the LED array 3 are supported. Therefore, there is a problem that a precise processing accuracy of the chassis 51 is required and the optical path adjustment from the light irradiation path to the image formation becomes complicated. .

  Patent Document 2 discloses an image reading region in which an LED chip 6 is provided at the lower part of an irradiation optical path 14 and is irradiated from the LED chip 6 and reflected by the upper inclined portions 16a and 16b to be positioned on the upper side. Since S is illuminated, there is a problem in that the irradiation path becomes longer in the height direction and the image reading apparatus has a relatively large size.

  Although the thing of patent document 3 uses the mirror array for the imaging optical system, there is no detailed description regarding the specific installation position and irradiation method of an illumination optical system, and the specific installation position of a mirror array.

  In Patent Document 4, although the reflecting mirrors 19 to 21, the reflecting illumination unit 18, the reflecting original image forming lens 23 and the solid-state imaging device 24 are distributed around the carriage frame 17, the illumination optics is used. The specific coupling between the system and the imaging optical system is not described.

  The present invention has been made to solve the above-described problems, and is a flat plate in which a casing that illuminates an irradiated object and a casing that forms an optical image incident on the irradiated object can be separated. An object is to provide a compact image sensor having a shape.

  An image sensor according to a first aspect of the present invention is a light source that irradiates light in the main scanning direction, light that is incident from the light source, guides light in the sub-scanning direction, and is totally reflected on the exit surface. A light guide for irradiating the irradiated portion of the irradiated body, an imaging means having a lens for converging the scattered light of the light reflected by the irradiated body, and a light receiving section for receiving the light converged by the imaging means And a housing that houses or holds the light source, the light guide, the imaging means, and the light receiving unit.

  In the image sensor of the invention according to claim 2, the casing is divided into an illumination unit that houses the light source and the light guide, and an imaging unit that houses the imaging means and the light receiving unit. Claim 1.

  An image sensor according to a third aspect of the present invention is a light source that irradiates light in the main scanning direction, light that is incident from the light source, guides light in the sub-scanning direction, and is totally reflected on the exit surface. A light guide that irradiates the irradiation portion of the irradiated body, a first mirror that is arranged in an array that receives scattered light reflected by the irradiated body and reflects it in the sub-scanning direction, and the first mirror Through a concave first aspherical mirror arranged in an array that collimates the light and reflects it as a substantially parallel light bundle, and an aperture arranged in an array that is shielded from light and selectively allows light to pass through. Apertures arranged in an array that allows light from the first aspherical mirror to pass therethrough, and concave second aspherical mirrors arranged in an array that allows light from this aperture to be incident and reflected as convergent light, and Converged by the second aspherical mirror A second mirror arranged on the optical path of the light and arranged in an array shape that reflects light in a direction perpendicular to the sub-scanning direction, and the light from the second mirror is incident and corresponds to the light from the opening. A light receiving portion having a light receiving region to form an image, the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving And a housing for storing or holding the part.

  An image sensor according to a fourth aspect of the present invention is a light source that irradiates light in the main scanning direction, light that enters from the light source, guides light in the sub-scanning direction, and is totally reflected on the exit surface. A light guide that irradiates the irradiation portion of the irradiated body, a first mirror that is arranged in an array that receives scattered light reflected by the irradiated body and reflects it in the sub-scanning direction, and the first mirror Through a concave first aspherical mirror arranged in an array that collimates the light of the beam and reflects it as a substantially parallel light bundle, and an aperture arranged in an array that allows light to pass through selectively. Apertures arranged in an array that allows light from the first aspherical mirror to pass therethrough, and concave second aspherical mirrors arranged in an array that allows light from this aperture to be incident and reflected as convergent light, and Converged by the second aspherical mirror A second mirror arranged on the optical path of the light and arranged in an array shape that reflects light in a direction perpendicular to the sub-scanning direction, and the light from the second mirror is incident and corresponds to the light from the opening. A light receiving portion having a light receiving region to form an image, the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving And a housing that houses or holds the portion, and the light incident on the first mirror reflects the scattered light in a different sub-scanning direction for each adjacent array.

  An image sensor according to a fifth aspect of the present invention is a light source that irradiates light in the main scanning direction, light that is incident from the light source, guides light in the sub-scanning direction, and is totally reflected on the exit surface. A light guide that irradiates the irradiation portion of the irradiated body, a first mirror that is arranged in an array that receives scattered light reflected by the irradiated body and reflects it in the sub-scanning direction, and the first mirror Through a concave first aspherical mirror arranged in an array that collimates the light of the beam and reflects it as a substantially parallel light bundle, and an aperture arranged in an array that allows light to pass through selectively. Apertures arranged in an array for entering and reflecting light from the first aspherical mirror, and concave second aspherical mirrors arranged in an array for receiving light from this aperture and reflecting it as convergent light; Converged with this second aspherical mirror A second mirror disposed on the optical path of the light and arranged in an array shape that reflects the light in a direction perpendicular to the sub-scanning direction, and the light from the second mirror is incident on the light from the opening. A light-receiving unit having a light-receiving region that forms an image correspondingly, the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the And a housing that houses or holds the light receiving unit.

  An image sensor according to a sixth aspect of the present invention is a light source that irradiates light in the main scanning direction, light that enters from the light source, guides light in the sub-scanning direction, and is totally reflected on the exit surface. A light guide that irradiates the irradiation portion of the irradiated body, a first mirror that is arranged in an array that receives scattered light reflected by the irradiated body and reflects it in the sub-scanning direction, and the first mirror Through a concave first aspherical mirror arranged in an array that collimates the light of the beam and reflects it as a substantially parallel light bundle, and an aperture arranged in an array that allows light to pass through selectively. Apertures arranged in an array for entering and reflecting light from the first aspherical mirror, and concave second aspherical mirrors arranged in an array for receiving light from this aperture and reflecting it as convergent light; Converged with this second aspherical mirror A second mirror disposed on the optical path of the light and arranged in an array shape that reflects the light in a direction perpendicular to the sub-scanning direction, and the light from the second mirror is incident on the light from the opening. A light-receiving unit having a light-receiving region that forms an image correspondingly, the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the And a housing that houses or holds the light receiving unit, and the light incident on the first mirror reflects the scattered light in a different sub-scanning direction for each adjacent array.

  An image sensor according to a seventh aspect of the present invention is the image sensor, wherein the housing houses the light source and the light guide, the lighting unit, the first mirror, the second mirror, the first aspherical mirror, the first 7. The apparatus according to claim 3, which is divided into two aspherical mirrors, an imaging unit that houses or holds the aperture and the light receiving unit.

  According to the image sensor of the present invention, the light is guided in the sub-scanning direction along the light guide path of the light guide, and the light totally reflected on the exit surface of the light guide is directly emitted from the inside of the light guide to the outside. Since the irradiation part of the irradiated object is irradiated, the structure of the housing part that forms the illumination optical system part becomes a flat structure, and the housing part that forms the imaging optical system part can be easily separated and designed There is an effect that it becomes a compact image sensor.

  Further, according to the image sensor of the present invention, the irradiation path from the illumination optical system to the irradiated object such as a document is separated from the imaging path until the scattered light reflected by the irradiated object is received. Even if a telecentric optical system with a deep focal depth is used for the image optical system, an image sensor that can be easily replaced even when a general lens body such as a rod lens array with a relatively shallow focal depth is used. There is an effect to get.

Embodiment 1 FIG.
Hereinafter, an image sensor (also referred to as CIS) according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of the image sensor according to the first embodiment. In FIG. 1, reference numeral 1 denotes an object to be irradiated such as a document or a medium (also referred to as an original), 2 a top plate for supporting the object to be irradiated 1, 3 a light guide for propagating light, and 3 a for emission from the light guide 3. A region (also referred to as an emission part, an emission part), 4 is a transmissive body that allows light to pass through, 5 is a light irradiation part for the irradiated object 1, and 6 is a first mirror that reflects scattered light from the irradiation part 5 in the sub-scanning direction. , 7 is a concave first lens mirror that receives reflected light from the first mirror 6 (also referred to as a first lens or first aspherical mirror), 8 is an aperture that receives parallel light from the first lens 7, and 9 is A concave second lens mirror (also referred to as a second lens or second aspherical mirror) that receives the transmitted light from the aperture 8, 10 is a surface of the aperture 8 that is shielded from the surroundings and reduces chromatic aberration of light passing through the aperture 8 Or the opening provided in the vicinity, 11 is the second Receiving light from the lens 9, a second mirror for reflecting.

  Reference numeral 12 denotes a sensor IC (also referred to as a light receiving portion) having a MOS semiconductor configuration including a photoelectric conversion circuit that photoelectrically converts reflected light from the second lens 9 that has passed through the opening portion 10 through a second mirror 11 and a driving portion thereof. ), 13 is a sensor substrate on which the sensor IC 12 is placed, and includes a first sensor substrate 13a and a second sensor substrate 13b. Reference numeral 14 denotes a signal processing IC (ASIC) that processes a signal photoelectrically converted by the sensor IC 12, 15 denotes an electronic component such as a capacitor and a resistor placed on the sensor substrate 13, and 16 denotes an image formed by a lens or a mirror. It is a housing that houses an imaging optical system that is a means (lens body). Reference numeral 17 denotes an elastic member made of a urethane sheet or the like provided at the boundary between the illumination optical system and the imaging optical system, and 18 denotes a slit through which light from the irradiated body 1 passes. Reference numeral 19 denotes a signal processing board on which the ASIC 14 or the like is placed, and 20 denotes an internal connector that electrically connects the sensor board 13 and the signal processing board 19. Note that the reflected light (scattered light) from the irradiated body 1 propagates except the light irradiation source and the light guide 3 constituting the illumination optical system, and houses the imaging optical system composed of lenses and mirrors. The body part is called an imaging unit (imaging optical system unit). In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 2 is a cross-sectional view of the cross-sectional view shown in FIG. 1 at another position in the main scanning direction. The imaging optical system portion forming the light propagation path is symmetrical with that shown in FIG. It has a structure. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  FIG. 3 is a schematic plan view for explaining the flow of light inside the imaging optical system installed in an array with a 6 mm pitch mounted on the image reading apparatus according to Embodiment 1 of the present invention. In FIG. 3, 21 is an optical cell (holder) that is individually arranged in the main scanning direction in units of 6 mm pitch, and 22 is an adjacent optical cell in the path where the reflected light from the second lens 9 is received by the sensor IC 12. 21 is a light-shielding wall (light-shielding plate) integrally formed with the optical cell 21 and shielded with black to prevent mutual light interference.

  The light receiving lines are formed on both sides centering on the reading line extending in the main scanning direction (the reading width direction of the document 1), and the adjacent optical cells 21 are provided in an array and have a symmetrical structure. Light rays forming an image read in the vicinity of the center of each optical cell 21 are reflected around the center and received by the light receiving line of the sensor IC 12 to form an image read in the vicinity of the boundary (edge) of the optical cell 21. The light beam is received by the light receiving line of the sensor IC 12 located near the opposite end of the optical cell 21. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  4 is an overall configuration diagram of the image sensor according to the first embodiment of the present invention. FIG. 4 (a) is a plan view illustrating the respective side surfaces, and FIG. 4 (b) is an illumination optical system, an imaging unit, and the like. It is a side reference figure at the time of isolate | separating. In FIG. 4, 23 is a light source (LED array light source) arranged in an array in the main scanning direction that emits RGB or pseudo white light, 23a is an individual LED chip constituting the LED array light source 23, and 23b supplies power to the light source 23. It is an LED cable. Reference numeral 24 denotes an illumination-side housing that houses the light source 23. Reference numeral 25 denotes a fixing screw for fixing the illumination side casing 24 and the imaging unit, and 26 denotes a positioning pin for positioning the illumination optical system side casing 24 and the imaging optical system casing 16. Reference numeral 27 denotes an external connector for an input / output interface that drives the CIS. A housing portion that houses at least the light source 23 and the light guide 3 is referred to as an illumination unit (illumination optical system unit).

  FIG. 5 is a plan view of the sensor substrate 13 in which the first sensor substrate 13a and the second sensor substrate 13b are arranged in parallel. Reference numeral 20 denotes an internal connector installation area. Although the sensor ICs 12 linearly arranged on the sensor board 13a and the sensor board 13b are parallel to each other, the image information reflected from the irradiating unit 5 is read in an interpolating manner, so that adjacent linearly arranged There may be a gap between the sensor ICs 12 to be arranged, and the two sensor ICs 12 may be arranged so as to be mutually aligned in two parallel lines arranged linearly.

  FIG. 6 is a plan view of the sensor IC 12, and 28 is arranged on the light receiving surface with an RGB filter composed of gelatin material made of red (R), green (G) and blue (B) for one pixel (bit). The photoelectric conversion unit (also referred to as a pixel) 29 is a photoelectric conversion / RGB shift register driving circuit that photoelectrically converts the light incident on the pixel 28 for each RGB and holds the output, and 30 is a signal to the sensor IC 12 This is a wire bonding pad portion for inputting and outputting power.

  FIG. 7 is a block diagram of the image sensor according to the first embodiment, in which 31 is an amplifier that amplifies a signal photoelectrically converted by the sensor IC 12, and 32 is an analog-to-digital conversion that performs analog / digital conversion on the amplified photoelectric conversion output. (A / D converter), 33 is a signal processing unit for processing digital outputs of RGB colors, 34 is a system interface for exchanging signals between the CIS and the system body, and 35 is a RAM for storing image information of each color. , 36 is a CPU, and 37 is a light source driving circuit.

  Next, the operation of the image sensor according to the first embodiment of the present invention will be described. In FIG. 7, based on the system control signal (SYC) and the system clock signal (SCLK) signal from the system main body, the clock signal (CLK) of the signal processing IC (ASIC) 14 is synchronized with this via the system interface 34. A start signal (SI) is output to the sensor IC 12, and a continuous analog signal of each pixel (n) is output from the sensor IC 12 for each reading line (m) at the timing. In the example shown in FIG. 8, 7200 pixels are sequentially output for the analog signal, and in the example shown in FIG. 9, the output is 144 pixels as a unit.

  The analog signal amplified by the amplifier 31 is A / D converted by the A / D converter 32 and converted into a digital signal. After the A / D conversion, the signal output of each pixel (bit) is subjected to shading correction and all bit correction. Processing is performed by a correction circuit to be performed. In this correction, correction data is read out from the RAM 35 storing correction data obtained by uniformizing data read in advance with a reference test chart such as a white original, and a digital signal corresponding to A / D converted image information is processed. By doing. Such a series of operations is performed under the control of the CPU 36. This correction data is for correcting the sensitivity variation between the elements of the sensor IC 12 and the non-uniformity of the light sources 23.

  Next, the drive timing of the image sensor according to the first embodiment will be described with reference to FIGS. 7 and 10, the ASIC 14 turns on the light source lighting signal (LC) in conjunction with the CPU 36, and the light source drive circuit 37 supplies power to each light source 23 for a predetermined time. Emits white light. The start signal (SI) in synchronization with the continuously driven CLK signal sequentially turns on the output of the shift register of each element (pixel) forming the RGB drive circuit of the sensor IC 12, and the corresponding switch group is SIG (SO). By sequentially opening and closing the line, RGB image information (image output) synchronized with CLK is obtained. This image output is an output of each image read and accumulated in the previous line. Note that CNT is a color / monochrome switching signal, and is normally at a high level in the color mode. BLK (blanking) time is set for each color reading section of one line, and exposure time setting is varied. Therefore, all SIG (SO) is released in the BLK section.

  Next, the image signal SIG (SO) sequentially output will be described with reference to FIG. FIG. 11 is a principle diagram illustrating a light path with respect to the main scanning direction. The irradiation unit 5 varies with respect to the direction perpendicular to the conveyance surface depending on the thickness of the irradiation object 1. Assuming that a point light source is assumed on the surface of the irradiated object (original) 1 through a first mirror that reflects in the sub-scanning direction, the scattered light is collimated and incident on a lens that reflects the light as a substantially parallel light beam. To do. The light from the lenses arranged in an array is irradiated with a substantially parallel light beam on the windows (openings 10) of the apertures 8 that are discretely installed at a pitch of 6 mm. Further, the light emitted from the window 10 is incident on the sensor IC 12 for each light flux through a lens provided with a light shielding plate 22 for preventing light interference for each array, so that the image information becomes an inverted image on the light receiving surface of the sensor IC 12. To form an image. Therefore, the image information formed on the pixel 28 of the light receiving unit of each sensor IC 12 is an inverse image with respect to the irradiated object 1 such as a document. As the SIG (SO) signal, analog signals are simultaneously output in three series for each RGB by a shift register sequential switching signal provided in the drive circuit of the sensor IC 12.

  FIG. 12 is a principle diagram for explaining a light path in the main scanning direction of an array that emits light in the same sub-scanning direction of an optical system arranged in an array, and sensor ICs 12 (12a arranged in parallel in two rows). , 12b), the light that is effectively incident on each adjacent array.

  FIG. 13 is a diagram for explaining rearrangement and signal processing of reverse image data of an RGB signal subjected to A / D conversion, and shows a case where data is rearranged every 144 bits and then signal processing is performed. In FIG. 13, each RGB (SO) signal is stored in each cell constituted by the shift register circuit after the data shifted to the left by the shift register circuit, latched (LA), and then written by a write signal (WR). Sequentially, data rearranged as SIG (SO) from the first cell of the sensor IC 12 is stored in the RAM 35, and correction calculation processing is performed. In the first embodiment, since signals from the two series of sensor ICs 12a and 12b are processed, further signal processing is performed by the comparison / collation / decimation / restoration circuit in the next stage.

  FIG. 14 is a block diagram illustrating a comparison / collation / decimation / repair circuit. After rearrangement of the reverse image data, the data stored in the RAM1 and RAM2 areas, which are part of the RAM 35, are sequentially input to the shift register, and the respective RAM35 (RAM1, RAM2) data in the array boundary area are compared and verified. In the comparison / collation, since the light path is inverted in the sub-scanning direction for each adjacent array, the space between the array on the same side and the array on the opposite side and the light shielding plate 22 serving as the light shielding wall This is to improve the ghost in the main scanning direction due to reflection by unnecessary light, etc., and after comparing the pixel information at the corresponding position of the shift register, the difference is performed and the image data output is weighted. The weighting is increased for the data of the outermost pixel, and the weighting is decreased for the inner pixel. In the internal pixel region, one of the regularly reflected light regions is normal data, and the non-normally reflected light region is invalid data. These data are output after address conversion by a multiplexer circuit. Further, when the sensor substrate 13 is arranged in a random manner, a data area to be interpolated along the overlapping arrangement of the regular data and the invalid data area is set.

  As shown in FIG. 1 of Japanese Patent Laid-Open No. Hei 8-28966, the image data subjected to the correction calculation processing is processed through a system interface 34 by a color management and color management engine including data analysis and data restoration. It is output as SIG (RGB) color data.

  FIG. 15 is a diagram for explaining the optical distance in the sub-scanning direction. One focal position of the first lens 7 is substantially coincident with the irradiating portion 5 of the irradiated object 1, and the other focal position is the aperture. Is consistent with 8. In addition, one focal position of the second lens 9 coincides with the aperture 8 and the other focal position coincides with the light receiving surface. That is, there is a relationship of L3 = L1 + L2 and L4 = L5 + L6. FIG. 16 is a schematic view in which a light beam is embodied in addition to a light path, and shows that parallel light passes through the aperture 8.

  FIG. 17 embodies the light path in the sub-scanning direction by combining the adjacent arrayed optical systems in the first embodiment. The optical distances L3 and L4 from the first lens 7 to the second lens 9 are shown in FIG. Is substantially parallel light. The scattered light reflected from the first mirror 6 in the sub-scanning direction may be emitted in either direction for each adjacent array as long as it is a mirror target, and the light receiving unit 28 installed on the light receiving surface also has L4 = L5 + L6. Any position is acceptable if satisfied.

  1 and 2, the optical axis of the reflected light from the irradiating unit 5 is slightly inclined. However, in order to reliably perform signal processing in the boundary region in which the optical cells 21 are arranged in an array. Yes, in a CIS that is not a dust arrangement or a CIS with a low resolution or a low reading speed, the optical axis may be perpendicular to the transport direction.

  As described above, according to the image sensor according to the first embodiment, the illumination unit that illuminates the irradiated object from the light emitting part of the light guide by propagating the light emitted from the light source in the sub-scanning direction inside the light guide, Since the imaging unit for imaging light information incident from the irradiation body is separated, aligned with the positioning pin, and coupled with the screw, there is an effect of obtaining a flat plate-shaped compact image sensor.

Embodiment 2. FIG.
In the first embodiment, the light is guided in the sub-scanning direction and the light totally reflected on the exit surface is irradiated to the irradiation portion of the irradiated body, and the imaging means of the telecentric optical system is used. In the second embodiment, a case where a rod lens array is used as the imaging means will be described.

  An image sensor according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 18 is a cross-sectional view of an image sensor according to the second embodiment. In FIG. 18, reference numeral 50 denotes a lens body (imaging means) such as a rod lens array. Reference numeral 51 denotes a sensor board on which the light receiving unit 12 is placed, 52 denotes a signal processing board, and 53 denotes an internal connector that transfers signals and power between the sensor board 51 and the signal processing board 52. In the figure, the same reference numerals as those in FIGS. 1 and 4 denote the same or corresponding parts.

  Next, the operation will be described. In FIG. 18, the light emitted from the light source 23 extending in the main scanning direction propagates in the light guide 3 in the sub-scanning direction and is totally reflected by the emission region 3 a to illuminate the irradiation unit 5 of the irradiated object 1. The scattered light of the light reflected by the irradiated object 1 is converged by the rod lens array 50, and the light converged by the rod lens array 50 is received by the light receiving unit 12. The analog signal photoelectrically converted by the light receiving unit 12 is signal-processed by the signal processing board 52 via the sensor board 51. In the second embodiment, since the light receiving portions 12 corresponding to the light incident on the light receiving portions 12 are linearly arranged in a line, normal signal processing is performed.

  As described above, according to the image sensor according to the second embodiment, the illumination unit that illuminates the irradiated body from the light emitting portion of the light guide by propagating the light irradiated from the light source in the sub-scanning direction inside the light guide, By separating the imaging unit for imaging optical information incident from the illuminator, aligning with the positioning pin as in the first embodiment, and connecting with screws, the effect of obtaining a flat plate-shaped compact image sensor is obtained. In addition, it can be applied to a popular type image sensor using a rod lens array or the like.

Embodiment 3 FIG.
In the first and second embodiments, the light source is structured to emit light mainly in the sub-scanning direction, but in the third embodiment, a case where a plurality of total reflection surfaces are provided on the light guide will be described.

  Embodiment 3 of the present invention will be described with reference to FIG. FIG. 19 is a cross-sectional view of an image sensor according to the third embodiment. In FIG. 19, 60 is a light guide that totally reflects light and propagates light in the sub-scanning direction, 60a is a first reflecting surface that totally reflects light emitted from the light source 23 in the sub-scanning direction, and 60b is a sub-reflecting surface. It is an emission part (second reflection surface) that irradiates the irradiation part 5 of the irradiated body 1 with light propagating in the scanning direction. Other configurations are the same as those described in the first embodiment. In the figure, the same reference numerals as those in FIGS. 1 and 4 denote the same or corresponding parts.

  As described above, according to the image reading apparatus according to the third embodiment, the light emitted from the light source is totally reflected inside the light guide and then propagates in the sub-scanning direction. There is an effect that the degree of freedom is improved.

Embodiment 4 FIG.
Further, in order to efficiently perform total reflection in the sub-scanning direction on the total reflection surface of the light guide, a light guide 61 having an extended distance from the light source 23 to the total reflection surface 60a as shown in FIG. 20 may be used. As shown in FIG. 21, it is good also as the light guide 62 which extended the distance from the light source 23 to the total reflection surface 60a. In addition, as shown in FIG. 22, even if the light source 23 is enlarged on the signal processing board 19 and installed on the signal processing board 19, all the areas for guiding light in the sub-scanning direction are the same, so that there is a corresponding effect.

  According to the image sensor of the fourth embodiment, since the light guide path of the light emitted from the light source is extended and totally reflected, there is an effect of efficiently passing the light propagating in the sub-scanning direction.

Embodiment 5 FIG.
In the first, third, and fourth embodiments, a light guide that guides light in the sub-scanning direction and irradiates the irradiated portion of the irradiated body with the light that is totally reflected by the exit surface, and an image of the aperture that passes through the opening. In the fifth embodiment, a description will be given of a case in which an image forming unit that reflects from an aperture window (opening) is used.

  Embodiment 5 of the present invention will be described with reference to FIG. FIG. 23 is a cross-sectional view of an image sensor according to the fifth embodiment. In FIG. 23, reference numeral 106 denotes a first mirror that reflects scattered light from the irradiation unit 5 in the sub-scanning direction, and 107 denotes a concave first lens mirror that receives reflected light from the first mirror 106 (first lens first non-first). 108 is an aperture (aperture mirror) that receives parallel light from the first lens 107, 109 is a concave second lens mirror that receives reflected light from the aperture mirror 108 (second lens second non-second). (Also referred to as a spherical mirror), 110 is an opening provided on the surface of the aperture mirror 108 that is shielded from the surroundings and reduces the chromatic aberration of light that is incident on and reflected by the aperture mirror 108, and 111 receives light from the second lens 109. It is the 2nd mirror to reflect. In the figure, the same reference numerals as those in FIGS. 1 and 4 denote the same or corresponding parts.

  FIG. 24 is a cross-sectional view of the cross-sectional view shown in FIG. 23 at another position in the main scanning direction. The imaging optical system portion (also referred to as an imaging unit) has a symmetrical structure with respect to FIG. 23 and the reading position. ing. In the figure, the same reference numerals as those in FIG. 23 denote the same or corresponding parts.

  FIG. 25 is a configuration diagram of the optical lens system. Reference numeral 117 denotes a lens base on which the first lens 107 and the second lens 109 are integrally arranged, and reference numeral 118 denotes a first lens installed in an array on the lens base 117. 107 is a light shielding plate for preventing light interference between the 107 and the second lens 109. The lens base 117, the first lens 107, and the second lens 109 are made of acrylic resin, and a black light shielding material is applied except for the mirror surface of the lens. The lens cradle 117, the first lens 107, and the second lens 109 may be integrally formed with acrylic resin. In the figure, the same reference numerals as those in FIG. 23 denote the same or corresponding parts.

FIG. 26 is a schematic side view of an imaging system including an optical lens system and a mirror system. The first mirror 106 and the second mirror 111 are arranged adjacent to each other so as to face each other with the aperture mirror 108 interposed therebetween. It is an alternating structure and is continuously arranged in a strip shape. The surface of the aperture mirror 108 is provided with holes in a black resin or a thin metal plate, and the openings 110 are discretely arranged at a pitch of 6 mm. In the figure, the same reference numerals as those in FIGS. 23 and 24 denote the same or corresponding parts.
FIG. 27 is a diagram for explaining the optical distance in the sub-scanning direction. One focal position of the first lens 107 is substantially coincident with the irradiating part 5 of the object 1 to be fluctuated, and the other focal position is the aperture. It matches the mirror 108. Further, one focal position of the second lens 109 coincides with the aperture mirror 108, and the other focal position coincides with the light receiving surface. That is, there are relationships of L3 = L1 + L2, L4 = L5 + L6, and L3 = L4 + B.

  FIG. 28 is a schematic view in which a light beam is embodied in addition to a light path, and shows that parallel light passes through the aperture mirror 108.

  FIG. 29 embodies the light path in the sub-scanning direction by combining the adjacent arrayed optical systems in the fifth embodiment, and the optical distances L3 and L4 from the first lens 107 to the second lens 109. Is substantially parallel light. The scattered light reflected from the first mirror 106 in the sub-scanning direction may be emitted in either direction for each adjacent array as long as it is a mirror target, and the light receiving unit 28 installed on the light receiving surface also has L4 = L5 + L6. Any position is acceptable if satisfied.

  Since the process after the photoelectric conversion of the light incident on the light receiving unit 12 from the second lens 109 is the same as that described in the first embodiment, the description thereof is omitted.

  From the above, according to the image sensor according to the fifth embodiment, since the telecentric optical system can be configured even if the aperture is a reflection type, in addition to the effects described in the first embodiment, the optical lens system and the mirror system are respectively integrated. A compact and compact CIS imaging unit can be constructed.

It is sectional drawing of the image sensor by Embodiment 1 of this invention. It is sectional drawing seen from the position according to the main scanning direction of the image sensor by Embodiment 1 of this invention. It is a model top view explaining the light which flows through the imaging optical system of the image sensor by Embodiment 1 of this invention. FIG. 4A is an overall configuration diagram including side surfaces of an image sensor according to Embodiment 1 of the present invention, FIG. 4A is a plan view illustrating each side surface, and FIG. 4B is a diagram illustrating an illumination optical system and an imaging unit. It is a side reference figure at the time of isolate | separating. It is a top view of the sensor board | substrate of the image sensor by Embodiment 1 of this invention. It is a top view of sensor IC of the image sensor by Embodiment 1 of this invention. It is a block block diagram of the image sensor by Embodiment 1 of this invention. It is a connection diagram of sensor ICs of the image sensor according to the first embodiment of the present invention. It is the connection diagram by other Example of sensor ICs of the image sensor by Embodiment 1 of this invention. It is a timing chart of the image sensor by Embodiment 1 of this invention. It is a principle figure explaining the light path of the image sensor by Embodiment 1 of this invention. It is a principle figure explaining the light path of the image sensor by Embodiment 1 of this invention. It is a figure explaining rearrangement and signal processing of the reverse image data of the image sensor by Embodiment 1 of this invention. It is a block diagram explaining the comparison / collation / decimation / repair circuit of the image sensor according to the first embodiment of the present invention. It is a figure explaining the optical path of the subscanning direction of the image sensor by Embodiment 1 of this invention. It is a figure explaining the optical path embodied in the subscanning direction of the image sensor by Embodiment 1 of this invention. It is a figure explaining the optical path embodied in the subscanning direction of the image sensor by Embodiment 1 of this invention. It is sectional drawing of the image sensor by Embodiment 2 of this invention. It is sectional drawing of the image sensor by Embodiment 3 of this invention. It is sectional drawing which extended the light guide path of the image sensor by Embodiment 4 of this invention. It is sectional drawing which extended further the light guide of the image sensor by Embodiment 4 of this invention. It is sectional drawing which mounted the light source on the signal processing board | substrate of the image sensor by Embodiment 4 of this invention. It is sectional drawing of the image sensor by Embodiment 5 of this invention. It is sectional drawing seen from the position according to the main scanning direction of the image sensor by Embodiment 5 of this invention. It is a block diagram of the optical lens system of the image sensor by Embodiment 5 of this invention. It is a model side view of the optical system containing the optical lens system and mirror system of the image sensor by Embodiment 5 of this invention. It is a figure explaining the optical path of the subscanning direction of the image sensor by Embodiment 5 of this invention. It is a figure explaining the optical path embodied in the subscanning direction of the image sensor by Embodiment 5 of this invention. It is a figure explaining the path | route which implemented the subscanning direction of the image sensor by Embodiment 5 of this invention.

Explanation of symbols

1..Subject to be irradiated (original) 2..Top plate 3..Light guide 3a..Ejecting part (ejecting part)
4..Transparent body 5..Irradiating part 6..First mirror 7..First lens (first aspherical mirror)
8. Aperture 9. Second lens (second aspherical mirror) 10. Opening 11 Second mirror 12. Sensor IC 13. Sensor substrate 13a First sensor substrate 13b Second Sensor board 14 ··· Signal processing IC (ASIC) 15 · · Electronic component 16 · · Imaging housing (imaging unit)
17 .. Elastic member 18 .. Slit portion 19 .. Signal processing board 20 .. Internal connector 21 .. Optical cell (holder) 22 .. Light shielding plate 23 .. Light source (LED array) 23 a. Lighting system housing (lighting unit)
25 .. Fixing screw (screw) 26 .. Positioning pin 27 .. External connector 28 .. Pixel (bit) 29 .. Photoelectric conversion and RGB shift register drive circuit 30 .. W / B pad unit 31. ..A / D converter 33..Signal processing unit 34..System interface circuit 35..RAM (random access memory)
36..CPU 37..Light source drive circuit 50..Rod lens array (lens body)
51..Sensor board 52..Signal processing board 53..Internal connector 60..Light guide 60a..First reflection part 60b..Second reflection part (outgoing region)
61..Light guide 62..Light guide 106..First mirror 1077..First lens (first aspherical mirror)
108-Aperture mirror (aperture)
109 .. Second lens (second aspherical mirror)
110 .. Opening 111 .. Second mirror 117 .. Lens cradle 118 .. Shading plate

Claims (7)

A light source that emits light over the main scanning direction;
A light guide that enters the light from the light source, guides the light in the sub-scanning direction, and irradiates the irradiated portion of the irradiated body with the light totally reflected on the exit surface;
An imaging means having a lens for converging the scattered light of the light reflected by the irradiated object;
A light receiving portion for receiving the light converged by the imaging means;
A housing that houses or holds the light source, the light guide, the imaging means, and the light receiving unit;
Image sensor equipped with.   The image sensor according to claim 1, wherein the housing is divided into an illumination unit that houses the light source and the light guide, and an imaging unit that houses the imaging unit and the light receiving unit. . A light source that emits light over the main scanning direction;
A light guide that enters the light from the light source, guides the light in the sub-scanning direction, and irradiates the irradiated portion of the irradiated body with the light totally reflected on the exit surface;
A first mirror disposed in an array that receives scattered light reflected by the irradiated object and reflects it in the sub-scanning direction;
A concave first aspherical mirror arranged in an array that collimates the light from the first mirror and reflects it as a substantially parallel beam;
Apertures arranged in an array that allows light from the first aspherical mirror to pass through openings arranged in an array that allows light to be selectively transmitted through the array,
A concave second aspherical mirror arranged in an array that receives light from this aperture and reflects it as convergent light;
A second mirror disposed on the optical path of the light converged by the second aspherical mirror and arranged in an array that reflects light in a direction perpendicular to the sub-scanning direction;
A light receiving unit having a light receiving region that receives light from the second mirror and forms an image corresponding to the light from the opening;
A housing that houses or holds the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving unit;
Image sensor equipped with. A light source that emits light over the main scanning direction;
A light guide that enters the light from the light source, guides the light in the sub-scanning direction, and irradiates the irradiated portion of the irradiated body with the light totally reflected on the exit surface;
A first mirror disposed in an array that receives scattered light reflected by the irradiated object and reflects it in the sub-scanning direction;
A concave first aspherical mirror arranged in an array that collimates the light from the first mirror and reflects it as a substantially parallel beam;
Apertures arranged in an array that allows light from the first aspherical mirror to pass through openings arranged in an array that allows light to pass therethrough selectively.
A concave second aspherical mirror arranged in an array that receives light from this aperture and reflects it as convergent light;
A second mirror disposed on the optical path of the light converged by the second aspherical mirror and arranged in an array that reflects light in a direction perpendicular to the sub-scanning direction;
A light receiving unit having a light receiving region that receives light from the second mirror and forms an image corresponding to the light from the opening;
A housing that houses or holds the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving unit;
And the light incident on the first mirror reflects the scattered light in different sub-scanning directions for each adjacent array. A light source that emits light over the main scanning direction;
A light guide that enters the light from the light source, guides the light in the sub-scanning direction, and irradiates the irradiated portion of the irradiated body with the light totally reflected on the exit surface;
A first mirror disposed in an array that receives scattered light reflected by the irradiated object and reflects it in the sub-scanning direction;
A concave first aspherical mirror arranged in an array that collimates the light from the first mirror and reflects it as a substantially parallel beam;
Apertures arranged in an array that allows light from the first aspherical mirror to be incident and reflected through openings arranged in an array that allows light to pass therethrough selectively.
A concave second aspherical mirror arranged in an array that receives light from this aperture and reflects it as convergent light;
A second mirror disposed on the optical path of the light converged by the second aspherical mirror and arranged in an array that reflects light in a direction perpendicular to the sub-scanning direction;
A light receiving unit having a light receiving region that receives light from the second mirror and forms an image corresponding to the light from the opening;
A housing that houses or holds the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving unit;
Image sensor equipped with. A light source that emits light over the main scanning direction;
A light guide that enters the light from the light source, guides the light in the sub-scanning direction, and irradiates the irradiated portion of the irradiated body with the light totally reflected on the exit surface;
A first mirror disposed in an array that receives scattered light reflected by the irradiated object and reflects it in the sub-scanning direction;
A concave first aspherical mirror arranged in an array that collimates the light from the first mirror and reflects it as a substantially parallel beam;
Apertures arranged in an array that allows light from the first aspherical mirror to be incident and reflected through openings arranged in an array that allows light to pass therethrough selectively.
A concave second aspherical mirror arranged in an array that receives light from this aperture and reflects it as convergent light;
A second mirror disposed on the optical path of the light converged by the second aspherical mirror and arranged in an array that reflects light in a direction perpendicular to the sub-scanning direction;
A light receiving unit having a light receiving region that receives light from the second mirror and forms an image corresponding to the light from the opening;
A housing that houses or holds the light source, the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving unit;
And the light incident on the first mirror reflects the scattered light in different sub-scanning directions for each adjacent array.   The housing includes an illumination unit that houses the light source and the light guide, the first mirror, the second mirror, the first aspherical mirror, the second aspherical mirror, the aperture, and the light receiving unit. The image sensor according to claim 3, wherein the image sensor is divided into an image forming unit that houses or holds the portion.