JP6877951B2 - Light irradiation device and light reader - Google Patents

Description

The present invention relates to a light irradiation device and a light reader.

Conventionally, a technique of scanning (irradiating) light from a light source along a linear main scanning line has been widely used in an image forming apparatus, a laser processing apparatus, and the like. Patent Document 1 discloses an optical scanning device (light irradiation device) provided in this type of device.

The optical scanning device of Patent Document 1 includes a light projecting means and a light reflecting means. The light projecting means emits light while moving it at a constant velocity. The light reflecting means is for reflecting the light emitted from the light projecting means and guiding it to an arbitrary irradiated point on a predetermined scanning line. The light reflecting means has a plurality of reflecting portions, reflects the light radiated from the light projecting means twice or more and guides the light to an arbitrary irradiation point, and each of the reflecting portions is composed of a plurality of reflecting surfaces. ing. The optical path length from the light projecting means to the irradiated point is substantially constant over all the irradiated points on the scanning line, and the scanning speed of the light emitted from the light projecting means on the scanning line is substantially constant.

With this configuration, the optical scanning apparatus of Patent Document 1 makes it possible to scan light substantially linearly along the main scanning direction.

Japanese Patent No. 5401629

However, in the configuration of Patent Document 1, the position of the irradiated point corresponding to the end of each angle range obtained by dividing the range in which the light moves angularly with the main scanning corresponds to the end of the adjacent angle range. The arrangement of the reflecting part must be mechanically adjusted so as to match the position of the irradiated point.

That is, in the configuration of Patent Document 1, in order to perform light scanning without duplication and interruption, it is necessary to adjust the arrangement of the reflecting portion with high accuracy, and the adjustment requires a very large amount of time. There was room for improvement in terms of doing so.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable a series of scanning of light with a simple configuration.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

According to the first aspect of the present invention, a light irradiation device having the following configuration is provided. That is, this light irradiation device includes an emission unit, a reflection unit, and a control unit. The emitting unit can emit light from a light source and change its emission angle. It is considered that the movable angle due to the change of the emission angle is divided into small parts, and the reflecting portion is provided corresponding to each division range so that the light becomes continuous. Here, the substantially linear scanning planned range is considered as the main scanning, and the divided emission angle changing range is considered as the divided angle. The reflecting portion has a role of converting the locus of the arc strings so that the arc strings are continuous in the main scanning range as the light emission angle changes for each division angle range. The control unit controls the irradiation of light from the emission unit by controlling the light emission timing of the light source. In this light irradiation device, the emission angle of light changes from one end to the other end of the division angle range in each division angle range. At that time, the scannable range is partially overlapped in the main scanning direction between the division angle ranges adjacent to each other. The control unit controls scanning of light from the emission unit so as to selectively irradiate light in two division angle ranges in a portion where the scanning ranges overlap.

As a result, the size of the light irradiation device can be easily increased, and the continuity of scanning over a plurality of division angle ranges can be ensured even if an error occurs in the angle of the reflecting portion or the like.

According to the second aspect of the present invention, an optical reader having the following configuration is provided. That is, this light reading device includes a reading unit, a reflecting unit, and a control unit. The reading unit can detect light with an optical sensor and change the incident angle of the detection light, which is the light to be detected. In the reflection portion, the incident angle of the detection light corresponding to the substantially linear scanning planned range (main scanning) is divided into a plurality of small portions, which is considered as the division angle range. For each division angle range, a point separated from the optical sensor by a certain distance along the detection light draws a locus of an arc string as the incident angle of the detection light changes. Light is reflected a plurality of times by providing a reflecting portion corresponding to each angle range so that the strings of the arc are in the same direction as the main scanning direction. The control unit controls the reading in the reading unit by controlling the reading timing of the optical sensor. Each of the division angle ranges partially overlaps the reading range within the main scan. The control unit controls the reading in the reading unit so that the output of the optical sensor in the two division angle ranges is selectively used in the portion where the reading ranges overlap.

As a result, the size of the light reading device can be easily increased, and the continuity of light reading over a plurality of division angle ranges can be ensured even if an error occurs in the angle of the reflecting portion or the like.

According to the present invention, light can be scanned in a series with a simple configuration.

FIG. 3 is a block diagram showing an overall configuration of a multifunction device including an optical writing device (light irradiation device) and a light reading device according to an embodiment of the present invention. The schematic which shows the structure of the optical writing apparatus. The conceptual diagram which shows the positional relationship of the deflection center of a galvano mirror, the reflection surface of a 1st reflection part, the reflection surface of a 2nd reflection part, and a main scanning line in an optical writing apparatus. The conceptual diagram explaining that ON / OFF of a laser beam is controlled so as to selectively irradiate light of two division angle ranges in a portion where irradiation ranges overlap. The conceptual diagram explaining the example of generating the rearranged pixel sequence in advance for writing an intended image. The schematic which shows the structure of an optical reader. The conceptual diagram explaining the example of processing the pixel string obtained by the reading part in order to read an intended image.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a multifunction device 1 including an optical writing device (light irradiation device) 32 and a light reading device 33 according to an embodiment of the present invention. FIG. 2 is a schematic view showing the configuration of the optical writing device 32. FIG. 3 is a conceptual diagram showing the positional relationship between the deflection center of the galvano mirror 24, the reflection surface of the first reflection unit 71, the reflection surface of the second reflection unit 72, and the main scanning line 52 in the optical writing device 32.

First, the overall configuration of the multifunction device 1 including the optical writing device (light irradiating device) 32 and the light reading device 33 according to the embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the multifunction device 1 of the present embodiment mainly includes a device control unit 10, an operation unit 11, a display unit 12, an image processing unit 13, a communication unit 14, an image forming unit 15, and an image reading unit 16. And a storage unit 19.

The device control unit 10 controls the operation of each component of the multifunction device 1. The device control unit 10 is mainly realized by a microcomputer including a CPU, a ROM, a RAM, an I / O controller, a timer, and the like. The device control unit 10 makes the multifunction device 1 function by organically operating each hardware based on a control program stored in advance in a ROM or the like.

The operation unit 11 is an interface for operating the multifunction device 1. The operation unit 11 can be configured as, for example, a key, a button, or the like. Further, the operation unit 11 may be configured as a touch panel provided integrally with the display unit 12. The user can give various instructions to the multifunction device 1 by operating the operation unit 11.

The display unit 12 is a portion that displays various types of information, and is composed of, for example, a liquid crystal display, an EL display, or the like.

The image processing unit 13 performs various image processing. For example, the image processing unit 13 can perform processing such as brightness adjustment and contrast adjustment on the image data read by the image reading unit 16 and generated according to the instruction from the operation unit 11.

The communication unit 14 communicates with a computer, a mobile information terminal, an external information processing device, a facsimile machine, or the like via a network or the like, and transmits and receives various information such as e-mail and fax to and from these external communication devices.

The image forming unit 15 prints the image data generated by the image processing unit 13 on paper, and includes a photosensitive drum 202, an optical writing device 32 for writing an electrostatic latent image on the photosensitive drum 202, and an optical writing device 32. It has. The optical writing device 32 includes a writing control unit (control unit) 21, a semiconductor laser (light source) 22, a galvano mirror driving unit 23, a galvano mirror 24, a writing setting unit (setting unit) 25, and a reflection unit 66. .. In this configuration, the image forming unit 15 irradiates the photosensitive drum 202 with light based on the image data generated by the image processing unit 13 to form an electrostatic latent image, and adheres toner to the electrostatic latent image. This forms a toner image. The toner image formed on the surface of the photosensitive drum 202 moves toward the transfer roller side shown in the drawing by the rotation of the photosensitive drum 202, is transferred to the paper by the electric field suction force, and is fixed by heating.

The write control unit 21 is configured as, for example, a microcontroller, and controls the light emission timing of the semiconductor laser 22 and the like.

The semiconductor laser 22 oscillates a laser beam by passing an electric current.

The galvano mirror drive unit 23 is a drive source for reciprocating and reciprocating the movable portion of the galvano mirror 24 at a constant angular velocity in a predetermined angular range.

The galvano mirror 24 is a known galvano mirror, and has a structure in which a movable portion including a reflecting mirror reciprocates and swings. The laser beam emitted from the semiconductor laser 22 and reflected by the galvano mirror 24 is applied to the photosensitive drum 202 (reflected by the reflecting portion 66 described later shown in FIG. 2). At this time, the irradiation position of the laser beam changes in the axial direction of the photosensitive drum 202 according to the angle of the movable portion of the galvano mirror 24. In other words, the galvano mirror 24 changes the emission angle of the laser light from the galvano mirror 24 by deflecting the laser light from the semiconductor laser 22, whereby the laser light is transmitted on the photosensitive drum 202 in the main scanning direction. Is scanned into. By repeating scanning (irradiation) of the laser beam from one end to the other end in the axial direction of the photosensitive drum 202 while rotating the photosensitive drum 202, a two-dimensional electrostatic latent image can be written on the surface of the photosensitive drum 202. it can.

In the present embodiment, by irradiating the laser beam for one main scan, one row of pixel rows from one end to the other end of the paper in the width direction of the image data is electrostatically latent on the surface of the photosensitive drum 202. It will be formed as an image.

The writing setting unit 25 of FIG. 1 is composed of, for example, a ROM or the like, and can variably store various parameters related to image writing in the optical writing device 32. The setting for the write setting unit 25 can be performed, for example, by operating the operation unit 11.

The reflecting unit 66 has a plurality of reflecting surfaces, appropriately reflects the laser beam reflected by the galvano mirror 24, and guides the laser light to the surface of the photosensitive drum 202. The detailed configuration of the reflection unit 66 will be described later.

The image reading unit 16 reads a document (object) set at a predetermined position to generate image data, and emits light from a fluorescent lamp 303, which is a light source for shining light on the document, and light from the document. An optical reading device 33 for reading is provided. The optical reading device 33 includes a reading control unit (control unit) 26, an optical sensor 27, a galvano mirror driving unit 28, a galvano mirror 29, a reading setting unit (setting unit) 30, and a reflection unit 66. With this configuration, the image reading unit 16 can generate image data based on information such as the intensity of the light reflected by the fluorescent lamp 303 reflected by the document and received by the optical sensor 27.

The reading control unit 26 is configured as, for example, a microcontroller, and controls the reading timing and the like by the optical sensor 27.

The optical sensor 27 is composed of a known sensor and outputs an electric signal according to the intensity of the light to be detected.

Since the galvano mirror drive unit 28 and the galvano mirror 29 are substantially the same as the configurations of the galvano mirror drive unit 23 and the galvano mirror 24 in the image forming unit 15, detailed description thereof will be omitted.

The light to be detected in the light reading device 33 (hereinafter, may be referred to as “detection light”) is the light of the fluorescent lamp 303 reflected by the document. This detection light is incident on the light sensor 27 as detection light (reflected by the reflection unit 86 described later shown in FIG. 6), but the position of the document based on which detection light is guided to the light sensor 27 is determined by galvano. It changes in the width direction of the document according to the angle of the movable portion of the mirror 29. As a result, the document is read and scanned in the width direction (main scanning direction). For example, two-dimensional image data can be obtained by repeating scanning from one end to the other end in the width direction of the document while transporting the document in the sub-scanning direction.

In the present embodiment, one row of pixels from one end to the other end in the width direction of the document can be read by reading one main scan.

The reading setting unit 30 of FIG. 1 is composed of, for example, a ROM or the like, and can variably store various parameters related to image reading in the optical reading device 33. The setting for the reading setting unit 30 can be performed, for example, by operating the operation unit 11.

The reflecting unit 86 has a plurality of reflecting surfaces, appropriately reflects the above-mentioned detection light, and guides the light to the galvano mirror 29. The detailed configuration of the reflection unit 86 will be described later.

The storage unit 19 stores information and programs necessary for realizing various functions of the multifunction device 1. As the storage unit 19, a semiconductor element such as RAM or ROM, or a storage medium such as a hard disk or flash memory is used.

Next, the configuration of the optical writing device 32 provided in the multifunction device 1 and its operation will be described in detail mainly with reference to FIGS. 2 and 3.

FIG. 2 is a schematic view showing the configuration of the optical writing device 32. As shown in FIG. 2, in the optical writing device 32, as an optical element or an optical unit constituting an optical system for scanning laser light, a lens 61 and a prism are sequentially arranged from the side of the semiconductor laser 22 along the optical path of the laser light. 62, a first folding mirror 63, a second folding mirror 64, a galvano mirror 24, and a reflecting unit 66 are provided. The emission portion of the present embodiment is composed of the semiconductor laser 22, the galvanometer mirror 24, and the like. The optical writing device 32 includes a housing 69 that incorporates the optical element and a part of the optical unit.

FIG. 2 illustrates a case where the housing 69 accommodates the second folded mirror 64, the galvano mirror 24, and the reflecting portion 66, but this is only an example, and the lens 61, the prism 62, and the first folded portion 66 are included. The mirror 63 may be housed in the housing 69. The housing 69 is formed with a laser irradiation port 34 for irradiating the photosensitive drum 202 with laser light from the inside of the housing 69.

The lens 61 is an optical element that enables the laser light emitted by the semiconductor laser 22 to be focused. The prism 62, the first folded mirror 63, and the second folded mirror 64 guide the laser light that has passed through the lens 61 to the reflecting surface of the galvano mirror 24. Further, the prism 62, the first folding mirror 63, and the second folding mirror 64 secure an optical path length required for focusing the laser beam on the surface of the photosensitive drum 202 on the optical path upstream side of the galvano mirror 24. An optical unit that bends the optical path is constructed. These elements 62, 63, 64 may be omitted as appropriate, and other prisms or mirrors may be added as appropriate between the lens 61 and the galvano mirror 24.

The galvano mirror 24 radiates the laser beam incident from the second folded mirror 64 so as to move the laser beam at a constant velocity. The reflecting unit 66 reflects the light emitted from the galvano mirror 24 and guides it to an irradiation position on the main scanning line 52 (specifically, a straight line parallel to the axial direction on the surface of the photosensitive drum 202). By changing the angle of the galvano mirror 24, the irradiation position sequentially moves in the main scanning direction X along the main scanning line 52 on the photosensitive drum 202. The optical path length from the semiconductor laser 22 to the irradiation position is substantially constant over all the irradiation positions.

The galvano mirror 24 is driven by the galvano mirror drive unit 23 so as to change its angle at a constant speed. Therefore, the emission angle of the laser beam from the galvano mirror 24 changes at a constant angular velocity.

FIG. 3 is a conceptual diagram showing the positional relationship between the deflection center C, the first reflecting portion (first reflecting surface) 71, the second reflecting portion (second reflecting surface) 72, and the main scanning line 52. .. The optical writing device 32 according to the present embodiment does not have a means for changing the focal length of the laser beam according to the angle of the galvanometer mirror 24. Therefore, if the reflecting portion 66 does not exist, the focal point of the laser beam (a point separated from the semiconductor laser 22 along the light by a certain distance) is mainly scanned by the angle of the galvanometer mirror 24 as shown in the upper side of FIG. It draws an arc-shaped locus as it changes once. The center of this locus is the deflection center C that deflects the laser beam by the galvanometer mirror 24, and the radius of the locus is the optical path length from the deflection center C to the focal point. On the other hand, unlike the arcuate locus, the main scanning line 52 extends linearly in the main scanning direction X. Then, the distance from the irradiation position on the main scanning line 52 to the focal point changes according to the irradiation position. Therefore, considering the optical path length from the deflection center C to an arbitrary irradiation position on the main scanning line 52, the optical path length is not constant and changes according to the position of the irradiation position.

The reflecting unit 66 is provided to solve this problem, reflects the laser beam from the galvano mirror 24 at least twice, and then guides the laser beam to the photosensitive drum 202 (main scanning line 52). The reflecting unit 66 has a plurality of reflecting units 71, so that the optical path length from the reflecting surface of the galvano mirror 24 to an arbitrary irradiation position on the main scanning line 52 on the photosensitive drum 202 is substantially constant at all irradiation positions. Has 72.

The reflection unit 66 according to the present embodiment includes a first reflection unit 71 that reflects the laser light from the galvano mirror 24 and a second reflection unit 72 that further reflects the laser light from the first reflection unit 71. , Reflects the laser beam from the galvano mirror 24 twice. The reflecting portion 66 is composed of the first reflecting portion 71 and the second reflecting portion 72, and is fixed in the housing 69. However, the reflecting portion 66 may have three or more reflecting portions.

As described above, if the first reflecting portion 71 and the second reflecting portion 72 are not present, the focal point of the laser beam (a point at a certain distance from the semiconductor laser 22 along the light) is the emission angle of the light. As the value changes, an arc centered on the deflection center C (hereinafter, may be referred to as a “virtual arc”) is drawn. The radius R of the virtual arc is the optical path length from the center of deflection to the focal point. The first reflecting unit 71 and the second reflecting unit 72 bend the optical path from the deflection center C to the focal point, thereby converting the virtual arc so as to extend linearly in the main scanning direction X on the photosensitive drum 202. More specifically, the positions of the divided arcs DA1, DA2, ... By dividing the virtual arc are such that the directions of the strings VC1, VC2, ... Almost coincide with the main scanning line 52. It is converted by (the first reflecting unit 71 and the second reflecting unit 72).

That is, the first reflecting unit 71 and the second reflecting unit 72 each have a plurality of reflecting surfaces, and the range of the emission angle of the laser light from the galvano mirror 24 is divided into a plurality of divided angle ranges. A point (focus) separated from the semiconductor laser 22 by a certain distance along the above is a locus drawn as the light emission angle changes in the divided angle range. Strings VC1, VC2 of the divided arcs DA1, DA2, ... Light is reflected a plurality of times so that, ... Are in the same direction as the main scanning direction X (aligned with the main scanning direction X).

To briefly explain the specific method for converting the position of the virtual arc so as to match the main scanning line 52, first, by dividing the virtual arc at equal intervals, a plurality of divided arcs DA1, DA2, ...・ Get. Then, a plurality of virtual strings VC1, VC2, ... Corresponding to each of the plurality of divided arcs DA1, DA2, ... Are obtained. Then, the first reflecting portion 71 and the second reflecting portion 72 each have a plurality of reflecting surfaces so that the plurality of virtual strings VC1, VC2, ... Are sequentially linearly arranged in the main scanning direction X on the photosensitive drum 202. Determine the position and orientation of.

When the main scanning line 52 is formed in this way, the two points at both ends of the dividing arcs DA1, DA2, ... Are rearranged on the main scanning line 52, and the dividing arcs DA1, DA2, ... (That is, the two points). The curve connecting the two) is rearranged on the downstream side in the optical axis direction from the main scanning line 52. The focal point of the laser beam moves along the divided arcs DA1, DA2, ...

When a plurality of divided arcs DA1, DA2, ... Are obtained by dividing the virtual arc, the divided arcs DA1, DA2, ... Goodly approximate the corresponding virtual strings VC1, VC2, .... Therefore, the optical path length from the deflection center of the galvano mirror 24 to an arbitrary irradiation position on the main scanning line 52 is substantially constant over all irradiation positions. Since the split arcs DA1, DA2, ... Are well approximated to the corresponding virtual strings VC1, VC2, ..., the behavior of the focal point in each of the split arcs DA1, DA2, ... Is the main scan. It closely approximates the constant velocity linear movement along the line 52.

As described above, in the optical writing device 32 of the present embodiment, the reflecting unit 66 is composed of a plurality of planar reflecting surfaces. Therefore, it is advantageous that the scanning range of the laser beam can be easily increased and a large image forming apparatus can be easily realized.

As the number of divisions of the division arcs DA1, DA2, ... Increases, the distance between the midpoint of the virtual strings VC1, VC2, ... And the midpoint of the division arcs DA1, DA2, ... Then, the trajectory of the focus approaches the virtual string. Therefore, the constantness of the optical path length can be kept high. The number of divisions can be appropriately determined according to the error allowed in the optical writing device 32.

By the way, in the conventional configuration, in order to prevent duplication and chipping of light scanning, it is necessary to make the ends of adjacent virtual strings VC1, VC2, ... Strictly coincide with each other. Therefore, conventionally, the arrangement of the first reflecting portion 71 and the second reflecting portion 72 has been mechanically adjusted. However, in order to ensure the continuity of light scanning by such a method, it is necessary to adjust the arrangement of the first reflecting portion 71 and the second reflecting portion 72 with high accuracy, and the adjustment takes an extremely large amount of time. Was required.

In this regard, in the optical writing device 32 of the present embodiment, as shown in FIGS. 3 and 4, when the light emission angle changes from one end to the other end of the divided angle range in each divided angle range. When considering the irradiation range, which is the locus of the irradiation position of the light on the photosensitive drum 202, the irradiation ranges are intentionally arranged so as to partially overlap in the main scanning direction between the division angle ranges adjacent to each other. .. With this configuration, the continuity of light scanning can be ensured. In other words, the lack of light scanning can be reliably eliminated.

On the other hand, in the optical writing device 32 of the present embodiment, in order to eliminate the duplication of light scanning, the writing control unit 21 selects light in two division angle ranges in the portion where the irradiation ranges overlap. The irradiation of light from the semiconductor laser 22 is controlled so that the light is emitted in a targeted manner.

In the present embodiment, the optical writing device 32 is provided with a writing setting unit 25 (see FIG. 1) capable of setting the irradiation of light from the semiconductor laser 22. In each division angle range, the writing setting unit 25 has an irradiation start emission angle which is an emission angle at which an angle range in which light irradiation is allowed starts, and an irradiation end emission which is an emission angle at which the angle range ends. The angle and can be set. The writing control unit 21 irradiates the light from the semiconductor laser 22 and the light from the galvano mirror 24 based on the irradiation start / exit angle and the irradiation end / exit angle in each of the set division angle ranges. It is possible to control.

More specifically, in the optical writing device 32 of the present embodiment, in the portion where the irradiation ranges overlap, the irradiation position corresponding to the irradiation end emission angle in the division angle range on one side and the division angle on the other side. The write setting unit 25 sets the irradiation start / exit angle and the irradiation end / exit angle in each division angle range so that the irradiation position corresponding to the irradiation start / exit angle in the range matches. These set values are determined, for example, based on the measurement work performed by the operator at the time of factory shipment of the multifunction device 1. With this configuration, in the portion where the irradiation ranges overlap, the light irradiation in the two division angle ranges is distributed with reference to a certain irradiation position, so that the overlap or chipping of the light irradiation can be prevented.

In the following, the emission angle of the laser beam changes from 0 ° to 90 ° as the angle of the galvano mirror 24 for one main scan is changed, and the virtual arc is divided into eight divided arcs DA1, DA2, ... The ON / OFF control of the laser beam when the main scanning line 52 is formed by dividing and rearranging the laser beam will be described with reference to FIG. FIG. 4 is a conceptual diagram illustrating that ON / OFF of the laser beam is controlled so as to selectively irradiate light in two division angle ranges in a portion where the irradiation ranges overlap. In addition, in FIG. 4, the optical path actually bent by the reflecting portion 66 is shown in the developed form. Further, in FIG. 4, in order to distinguish and show the irradiation range corresponding to each division angle range in an easy-to-understand manner, the irradiation ranges adjacent to each other in the main scanning direction X are drawn so as to be different in the vertical direction. The plurality of irradiation ranges are arranged in a straight line along the main scanning line 52.

In the above example, since the virtual arc based on the change of the emission angle of the laser beam by 90 ° is divided into eight equal parts, the angle range of the emission angle corresponding to one divided arc DA1, DA2, ... Theoretically, it is 11.25 °. When the instantaneous timing of the irradiation for one main scan is expressed by the emission angle θ (0 ° ≤ θ ≤ 90 °) of the laser beam from the galvano mirror 24, for example, 0 ° ≤ θ ≤ 11.25 ° The irradiation range of 11.25 ° ≤ θ ≤ 22.5 ° partially overlaps in the main scanning direction X. The irradiation position of one point included in this overlapping range can be represented by θ1B, which is an angle included in the split angle range on one side, or θ2A, which is included in the split angle range on the other side. .. For example, it is assumed that θ1B = 11 ° and θ2A = 11.75 °.

In this case, in the present embodiment, the laser beam is turned off in the section of θ1B <θ <θ2A, and scanning is performed in the other sections. This makes it possible to prevent duplicate scans.

In the same way as this, the light irradiation in the two overlapping divided angle ranges is distributed to the covering portion of the other angle range with one point included in the overlapping range as a boundary. Therefore, in the example of FIG. 4, the laser beam is turned off (scanning is not performed) even in the sections of θ2B <θ <θ3A and θ3B <θ <θ4A.

In the example of FIG. 4, in the process of changing the emission angle of the laser beam from the galvano mirror 24 from 0 ° to 90 °, there is an emission angle in which light irradiation is permitted in each division angle range. It can be regarded as starting from (irradiation start emission angle) and ending at a certain emission angle (irradiation end emission angle). In this case, in the division angle range indicated by 0 ° ≦ θ ≦ 11.25 °, the irradiation start / exit angle is θ1A and the irradiation end / exit angle is θ1B. In the division angle range of 11.25 ° ≦ θ ≦ 22.5 °, the irradiation start exit angle is θ2A and the irradiation end exit angle is θ2B. Further, in the division angle range of 22.5 ° ≦ θ ≦ 33.75 °, the irradiation start exit angle is θ3A and the irradiation end exit angle is θ3B. The irradiation positions are the same when the emission angle is θ1B and θ2A, and the irradiation positions are the same when the emission angle is θ2B and θ3A, and when the emission angle is θ3B. As described above, the irradiation position is the same as in the case of θ4A.

In this way, the laser beam is turned off in the range of θ1B <θ <θ2A, θ2B <θ <θ3A, θ3B <θ <θ4A, ..., While the laser beam is scanned as usual in the other angle range. Therefore, the light can be scanned along the main scanning line 52 without being superimposed or interrupted.

Here, since the mechanical mounting error of the reflecting unit 66 and the like vary depending on the multifunction device 1 (optical writing device 32), it is inevitable that the irradiation range corresponding to each division angle range will vary. However, in the present embodiment, the irradiation start exit angle and the irradiation end exit angle (θ1A, θ1B, θ2A, θ2B, θ3A, ...) For each multifunction device 1 are obtained, and the multifunction device 1 is subjected to the irradiation. The angle range for turning off the laser beam can be set by software for the writing setting unit 25. As a result, it is possible to reliably prevent duplication and interruption of scanning with almost no need for strict mechanical adjustment.

Hereinafter, a method of adjusting the image data written by the optical writing device 32 will be described with reference to FIG. FIG. 5 is a conceptual diagram illustrating an example in which a rearranged pixel sequence is generated in advance in order to write an intended image.

As described above, in the optical writing device 32 of the present embodiment, the range of the emission angle of the laser beam includes a region (angle range) in which the laser beam should be turned off. Therefore, in order to appropriately write the intended image, the optical writing device 32 of the present embodiment scans after appropriately rearranging the pixels of the input image data.

Specifically, when the main scanning line 52 is formed by dividing the virtual arc into eight arcs and changing the position as described above, the pixel sequence corresponding to one main scanning in the image data (main). A group of pixels arranged in a row in the scanning direction) is divided into eight in the main scanning direction based on the irradiation start emission angle and the irradiation end emission angle in each division angle range. Then, the eight divided pixel sequence pieces are arranged so as to be separated from each other based on the irradiation start emission angle and the irradiation end emission angle in each division angle range. By separating the pixel array pieces from each other in this way, blank pixels are generated, and by performing the main scan based on the pixel array (rearranged pixel array), the laser beam is turned off in the blank portion.

In the above example, for example, since the laser beam is turned off in the section of θ1B to θ2A, the adjacent pixel array pieces are arranged separated by the number of pixels corresponding to the angle range of θ1B to θ2A. Similarly, the other adjacent pixel sequence pieces are also arranged separated by the number of pixels corresponding to the angle range of θ2B to θ3A, θ3B to θ4A, .... As a result, the rearranged pixel sequence is generated.

Note that FIG. 5 shows an example in which an image in which pixels are arranged in a matrix is divided into eight in the main scanning direction and rearranged. Since the image of FIG. 5 can be regarded as a collection of a plurality of pixel sequences corresponding to one main scan, by dividing and rearranging the image as shown in FIG. 5, substantially once. It can be said that the pixel sequence corresponding to the main scan of is divided and rearranged.

The optical writing device 32 scans based on the image in which the pixels are rearranged as shown in the lower side of FIG. 5 to form an image. As a result, the intended image can be appropriately formed even if the irradiation ranges are overlapped as described above. Further, by generating the rearranged pixel sequence in advance, writing can be performed at high speed.

Next, the optical reader 33 provided in the multifunction device 1 will be described mainly with reference to FIG. FIG. 6 is a schematic view showing the configuration of the optical reader 33.

As shown in FIG. 6, the optical reading device 33 constitutes an optical system that reads the reflected light (the above-mentioned detection light) by irradiating the document 2 conveyed on the reading glass 305 with the light of the fluorescent lamp 303. As an element or an optical unit, a reflecting unit 86, a galvano mirror 29, a second folded mirror 84, a first folded mirror 83, a prism 82, a lens 81, and an optical sensor 27 are provided in this order from the side of the reading glass 305. The reading unit of this embodiment is composed of an optical sensor 27, a galvanometer mirror 29, and the like.

In the example shown in FIG. 6, the second folded mirror 84, the galvano mirror 29, and the reflecting portion 86 are housed in the housing 89. A detection light incident port 35 for incident detection light is formed on the upper surface of the housing 89. The detection light is incident downward from the reading glass 305 toward the galvanometer mirror 29 via the detection light incident port 35.

The detection light incident on the reflecting surface of the galvano mirror 29 is converged on the lens 81 via the second folded mirror 84, the first folded mirror 83, and the prism 82. The light focused on the lens 81 is received by the optical sensor 27, and information such as the color of the detected light is sequentially extracted to form read data.

The detection light from the reading glass 305 is reflected by the reflecting unit 86 and guided to the galvano mirror 29. By changing the angle of the movable part of the galvano mirror 29 at a constant angular velocity by the galvano mirror drive unit 28, from one end to the other in the line (main scanning line 53) in the width direction of the document set at an appropriate position of the reading glass 305. The detection light from each reading position up to the end is sequentially incident on the optical sensor 27 from the galvano mirror 29. Due to the presence of the reflecting portion 86, the optical path length from each reading position from one end to the other end of the main scanning line 53 to the galvanometer mirror 29 (and thus to the optical sensor 27) is all readings on the main scanning line 53. It is almost constant in position.

Similar to the optical writing device 32, the optical reading device 33 according to the present embodiment includes a reflecting unit 86 for reflecting the detection light from the reading glass 305 at least twice and then guiding the light to the galvano mirror 29. The reflecting unit 86 has a plurality of reflecting units 91 and 92 so that the optical path length from an arbitrary reading position from one end to the other end in the width direction of the document 2 to the galvano mirror 29 is substantially constant over all reading positions. doing.

The positional relationship between the deflection center D, the first reflection portion 91, the second reflection portion 92, and the main scanning line 53 is the deflection center C in FIG. 3, the first reflection portion 71, and the second reflection portion 72. Since the positional relationship between the main scanning line 52 and the main scanning line 52 is substantially the same, the description thereof will be omitted.

In the first reflection unit 91 and the second reflection unit 92, the division angle is a point separated from the optical sensor 27 by a certain distance along the detection light for each division angle range in which the incident angle range of the detection light is divided into a plurality of division angles. The chords VC1, VC2, ... Of the dividing arcs DA1, DA2, ..., Which are loci drawn as the incident angle of the detection light changes in the range, are in the same direction as the main scanning direction X. The detection light is reflected multiple times.

In the optical reading device 33 of the present embodiment, substantially the same as the above-mentioned optical writing device 32, when the incident angle of the detection light changes from one end to the other end of the divided angle range in each divided angle range. When considering the reading range which is the locus of the reading position of the document 2, the reading positions are intentionally arranged so as to partially overlap in the reading direction between the division angle ranges adjacent to each other. With this configuration, the continuity of reading of the document 2 can be ensured. In other words, the lack of reading of the original can be reliably eliminated.

On the other hand, in the optical reading device 33 of the present embodiment, in order to eliminate the duplication of reading in the optical sensor 27, the reading control unit 26 performs the optical sensor 27 in two division angle ranges in the portion where the reading ranges overlap. The output of is controlled to be used selectively.

In the present embodiment, the optical reading device 33 is provided with a reading setting unit 30 (see FIG. 1) that can be set for reading. In each division angle range, the reading setting unit 30 has a reading start incident angle which is an incident angle at which the angle range allowed to be read by the optical sensor 27 starts, and a reading end which is an incident angle at which the angle range ends. The angle of incidence and can be set. The reading control unit 26 can control whether or not to use the output of the optical sensor 27 based on the reading start incident angle and the reading end incident angle in each of the set division angle ranges.

More specifically, in the optical reading device 33 of the present embodiment, in the portion where the reading ranges overlap, the reading position corresponding to the reading end incident angle in the split angle range on one side and the split angle range on the other side. The reading start angle and the reading end incident angle in each division angle range are set by the reading setting unit 30 so as to coincide with the reading position corresponding to the reading start incident angle in the above. These set values are determined based on the measurement work performed by the operator at the time of factory shipment of the multifunction device 1, similarly to the set values of the irradiation start emission angle and the irradiation end emission angle in the optical writing device 32. With this configuration, in the portion where the reading ranges overlap, the incident light in the two division angle ranges is distributed with reference to a certain reading position, so that it is possible to prevent duplication and chipping of readings.

The control in which the reading control unit 26 allows / stops reading by the optical sensor 27 is substantially the same as the control in which the writing control unit 21 turns on / off the laser beam in the above-mentioned optical writing device 32. Is omitted.

That is, for example, when a division angle range similar to that described with reference to FIG. 4 is applied to the image reading unit 16, the reading control unit 26 is an optical sensor in the range of θ1B to θ2A, θ2B to θ3A, ... While the input from 27 is not used, the input from the optical sensor 27 is used in other angle ranges to form the read data. As a result, the contents of the document 2 can be read along the main scanning line without causing duplication and chipping of readings.

Hereinafter, a method of generating image data read by the optical reader 33 will be described with reference to FIG. 7. FIG. 7 is a conceptual diagram illustrating an example of processing a pixel sequence obtained by the output of the optical sensor 27 in order to read the intended image data.

As described above, in the photodetector 33 of the present embodiment, the detection light from the same reading position of the document 2 is additionally input to the optical sensor 27 as the detection light of different incident angles. Therefore, in order to appropriately read the intended image, in the optical reading device 33 of the present embodiment, the reading control unit 26 obtains a pixel sequence corresponding to one main scan by the optical sensor 27. After tentatively creating using the outputs at all incident angles, the pixels of the pixel sequence are rearranged to control the acquisition of the pixel sequence for one main scan.

In the example in which the same division angle range as that of the optical writing device 32 described above is set, for example, in the section of θ1B to θ2A, the input from the optical sensor 27 is unnecessary, so that the reading control unit 26 sets the reading control unit 26 to θ1B to θ2A. The corresponding pixel string pieces are discarded, and the pixel string pieces of θ1A to θ1B and the pixel string pieces of θ2A to 2B are cut out and joined (consecutively arranged). Similarly, for the other parts that do not require input from the optical sensor 27, the relevant parts are discarded, and the pixel string pieces on both sides thereof are cut out and joined. As a result, a rearranged pixel sequence is generated.

In FIG. 7, the provisionally created pixel strings of the main scan are accumulated to generate a provisional image in which the pixels are arranged in a matrix, and then a part of the area of the image is discarded. However, an example is shown in which the remaining area is cut out and joined together. Since the image of FIG. 7 can be regarded as a collection of a plurality of pixel sequences corresponding to one main scan, it is practically possible to cut out a part of the image and arrange it continuously as shown in FIG. In addition, it can be said that a part of the pixel sequence corresponding to one main scan is cut out and arranged continuously.

By rearranging the pixels in this way, the photodetector 33 can appropriately read the image based on the document 2 even if there is an angle range in which the inputs from the photosensor 27 overlap.

As described above, the optical writing device (light irradiation device) 32 of the present embodiment includes an emitting unit, a reflecting unit 66, and a writing control unit 21. The emitting unit emits light from the semiconductor laser (light source) 22 and its emission angle can be changed. The reflection unit 66 changes the light emission angle in the division angle range at a point separated from the semiconductor laser 22 by a certain distance along the light for each division angle range in which the light emission angle range is divided into a plurality of division angles. Light is reflected a plurality of times so that the strings VC1, VC2, ... Of the divided arcs DA1, DA2, ..., Which are the loci drawn in accordance with the above, are in the same direction as the main scanning direction X. The writing control unit 21 controls the irradiation of light from the emitting unit. In the optical writing device 32, in each of the divided angle ranges, it is a locus of the irradiation position of the light on the object when the emitted angle of the light changes from one end to the other end of the divided angle range. When considering the irradiation range, the irradiation range partially overlaps in the main scanning direction between the division angle ranges adjacent to each other. The writing control unit 21 controls the irradiation of light from the emitting unit (semiconductor laser 22) so as to selectively irradiate the light in the two division angle ranges in the portion where the irradiation ranges overlap. To do.

As a result, it is easy to increase the size of the optical writing device 32, and even if there is an error in the angle of the reflecting unit 66 or the like, it is possible to ensure the continuity of scanning over a plurality of division angle ranges.

Further, the optical writing device 32 of the present embodiment includes a writing setting unit 25 capable of setting the irradiation of light from the emitting unit. In each of the divided angle ranges, the writing setting unit 25 has an irradiation start emission angle (θ1A, θ2A ...), Which is the emission angle at which the angle range in which light irradiation is allowed starts, and the angle range. The irradiation end exit angle (θ1B, θ2B, ...), Which is the exit angle to be terminated, can be set. The writing control unit 21 receives light from the emission unit based on the irradiation start emission angle (θ1A, θ2A, ...) And the irradiation end emission angle (θ1B, θ2B, ...). Control the irradiation.

As a result, by appropriately adjusting the settings of the irradiation start emission angle (θ1A, θ2A, ...) And the irradiation end emission angle (θ1B, θ2B, ...), the scanning of light straddles a plurality of division angle ranges. Can be done smoothly. As a result, the quality of writing can be improved.

Further, the optical writing device 32 of the present embodiment has the irradiation position corresponding to the irradiation end emission angle (for example, θ1B) in the division angle range on one side in the portion where the irradiation ranges overlap. The writing control unit 21 is set so as to coincide with the irradiation position corresponding to the irradiation start / exit angle (for example, θ2A) in the division angle range on the other side.

As a result, in the portion where the irradiation ranges overlap, the light irradiation in the two division angle ranges is distributed with reference to a certain irradiation position, so that the overlap or chipping of the light irradiation can be prevented.

Further, the optical writing device 32 of the present embodiment is configured as an optical writing device of the multifunction device 1 that handles images. The writing control unit 21 divides the pixel sequence corresponding to one main scan so as to correspond to the division angle range, and starts irradiation of the divided plurality of pixel sequence pieces in each of the division angle ranges. Once based on the rearranged pixel sequence generated by arranging them apart from each other based on the emission angle (θ1A, θ2A, ...) And the irradiation end emission angle (θ1B, θ2B, ...). The exit portion is controlled so as to irradiate the main scan portion of the above.

As a result, the intended image can be appropriately written even if the irradiation ranges are overlapped. Further, by rearranging the images in advance, writing can be performed at high speed.

Further, in the optical writing device 32 of the present embodiment, the light emitting unit includes a galvano mirror 24 capable of changing the light emitting angle.

As a result, it is possible to realize scanning of light that satisfactorily satisfies both linearity and continuity with an inexpensive configuration.

Further, the optical reading device 33 of the present embodiment includes a reading unit (composed of an optical sensor 27, a galvanometer mirror 29, etc.), a reflecting unit 86, and a reading control unit 26. The reading unit can detect the light with the optical sensor 27 and change the incident angle of the detection light which is the light to be detected. In the reflection unit 86, the incident angle of the detection light is defined as a point separated from the optical sensor 27 by a certain distance along the detection light for each division angle range in which the range of the incident angle of the detection light is divided into a plurality of division angles. Light is reflected a plurality of times so that the arcuate chord, which is a locus drawn as the value changes, is in the same direction as the main scanning direction X. The reading control unit 26 controls reading in the reading unit. In each of the divided angle ranges, when the reading range which is the locus of the reading position of the object when the incident angle of the detection light changes from one end to the other end of the divided angle range is considered, the above-mentioned adjacent to each other. The reading range partially overlaps in the main scanning direction X between the division angle ranges. The reading control unit 26 controls the reading in the reading unit so that the outputs of the optical sensors 27 in the two division angle ranges are selectively used in the portion where the reading ranges overlap.

As a result, the size of the light reading device 33 can be easily increased, and the continuity of light reading over a plurality of division angle ranges can be ensured even if an error occurs in the angle of the reflecting unit 86 or the like. ..

Further, the optical reading device 33 of the present embodiment includes a reading setting unit 30 that can be set for reading in the reading unit. The reading setting unit 30 has a reading start incident angle (θ1A, θ2A, ...), Which is the incident angle at which the angle range allowed to be read by the optical sensor 27 starts in each of the divided angle ranges, and the angle. The reading end incident angle (θ1B, θ2B, ...), Which is the incident angle at which the range ends, can be set. The reading control unit 26 controls the reading in the reading unit based on the reading start incident angle (θ1A, θ2A, ...) And the reading end incident angle (θ1B, θ2B, ...). ..

As a result, by appropriately adjusting the settings of the reading start incident angle (θ1A, θ2A, ...) And the reading end incident angle (θ1B, θ2B, ...), The reading of the detected light can be divided into a plurality of division angle ranges. It can be done smoothly across. As a result, the reading quality of the detected light can be improved.

Further, in the optical reading device 33 of the present embodiment, in the portion where the reading ranges overlap, the reading position corresponding to the reading end incident angle (for example, θ1B) in the divided angle range on one side and the reading position. The reading setting unit 30 is set so as to coincide with the reading position corresponding to the reading start incident angle (for example, θ2A) in the division angle range on the other side.

As a result, in the portion where the reading ranges overlap, the incident light in the two division angle ranges is distributed with reference to a certain reading position, so that the overlapping or chipping of the incident light can be prevented.

Further, in the optical reading device 33 of the present embodiment, the reading control unit 26 divides the provisional pixel strings obtained by the output of the optical sensor 27 in one scan along the main scanning line into the respective divisions. It is cut out based on the reading start incident angle (θ1A, θ2A, ...) And the reading end incident angle (θ1B, θ2B, ...) In the angle range, and a plurality of cut out pixel sequence pieces are continuously arranged. The reading unit is controlled so as to acquire a pixel sequence corresponding to one main scan based on the rearranged pixel sequence generated by the above.

As a result, the intended image can be appropriately read even if the reading ranges partially overlap.

In the light reading device 33 of the present embodiment, the reading unit includes a galvanometer mirror 29 capable of changing the incident angle of light.

As a result, it is possible to realize light reading without duplication or chipping with an inexpensive configuration.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

In the above embodiment, the emission unit of the optical writing device 32 is provided with a galvano mirror 24 as a member for changing the emission angle. However, the present invention is not limited to this, and for example, instead of this, a mirror having another configuration may be provided as a member for making the emission angle changeable. However, it is preferable to apply a mirror that can change the emission angle without changing the reflection point.

Similarly, in the above embodiment, the incident portion of the light reading device 33 includes a galvanometer mirror 29 as a member for changing the incident angle of the detected light, but instead of this, another configuration is provided. It may be provided with a mirror of. However, it is preferable to apply a mirror that can change the incident angle without changing the incident point.

In the above embodiment, the optical writing device 32 writes (transfers) the read image data on a flat sheet of paper, but the present invention is not limited to this, and for example, instead of this, the optical writing device 32 32 may be written with the read data as a three-dimensional structure. That is, the present invention may be applied to an optical writing device provided in a stereolithography type 3D printer. In that case, for example, the given three-dimensional shape data is finely sliced to obtain a large number of cross-sectional shapes, and the cross-sectional shape is drawn by the main scanning and the sub-scanning of the laser beam on the photocurable resin filled in the liquid tank. By repeating the operation of forming the resin cured layer, the three-dimensional shape can be formed. In the configuration of the 3D printer, it is preferable to irradiate the light in the portion partially overlapping between the above-mentioned division angle ranges in that the heat input at the boundary portion of the division angle range can be controlled. ..

In the above embodiment, the optical writing device 32 includes the semiconductor laser 22 as an element for oscillating the laser beam, but the present invention is not limited to this, and for example, a gas laser may be provided instead. ..

In the optical writing device 32 and the optical reading device 33, a cylindrical lens or an fθ lens may be arranged in the optical path.

In the optical writing device 32, the range of the emission angle (deflection angle) of the laser beam and the range of the division angle (number of divisions, etc.) described above are merely examples, and depend on the required accuracy of light writing and the like. , Can be changed as appropriate. Similarly, in the light reading device 33, the incident angle range and the division angle range of the detection light can be appropriately changed.

The above-mentioned light irradiation device is not limited to the light writing device, and may be, for example, a light irradiation device used for processing the surface at the time of manufacturing a solar panel or the like. The object to be processed by the light irradiation device is not limited to the solar panel, and may be any flat object to be processed (for example, a surface on which powder that is melted by heat is spread).

21 Write control unit (control unit)
22 Semiconductor laser (light source)
24 Galvano mirror 25 Write setting unit (setting unit)
32 Optical writing device (light irradiation device)
66 Reflector C Deflection center

Claims (10)

An exit part that emits light from a light source and can change the emission angle,
A locus drawn by a point separated from the light source by a certain distance along the light as the light emission angle changes in the division angle range for each division angle range in which the light emission angle range is divided into a plurality of division angles. A reflector that reflects light multiple times so that the arc chords are in the same direction as the main scanning direction.
A control unit that controls the irradiation of light from the emission unit by controlling the light emission timing of the light source, and a control unit.
With
In each of the division angle ranges, when considering the irradiation range which is the locus of the irradiation position of the light to the object when the emission angle of the light changes from one end to the other end of the division angle range, each other. The irradiation range partially overlaps in the main scanning direction between adjacent division angle ranges.
The control unit controls the irradiation of light from the emission unit so as to selectively irradiate the light in the two division angle ranges in the portion where the irradiation ranges overlap. Irradiation device. The light irradiation device according to claim 1.
A setting unit capable of setting the irradiation of light from the emission unit is provided.
In each of the divided angle ranges, the setting unit has an irradiation start exit angle, which is the emission angle at which the angle range in which light irradiation is allowed starts, and an irradiation end emission, which is the emission angle at which the angle range ends. The angle and can be set,
The control unit is a light irradiation device that controls irradiation of light from the emission unit based on the irradiation start emission angle and the irradiation end emission angle. The light irradiation device according to claim 2.
In the portion where the irradiation ranges overlap, the irradiation position corresponding to the irradiation end emission angle in the division angle range on one side and the irradiation corresponding to the irradiation start emission angle in the division angle range on the other side. A light irradiation device characterized in that the setting unit is set so that the position and the position match. The light irradiation device according to claim 2 or 3.
The light irradiation device is an optical writing device of an image forming device.
The control unit divides the pixel array corresponding to one main scan so as to correspond to the division angle range, and divides the divided plurality of pixel array pieces into the irradiation start / exit angles in the respective division angle ranges. Based on the rearranged pixel sequence generated by arranging the pixels so as to be separated from each other based on the irradiation end emission angle, the emission unit is controlled so as to perform irradiation for one main scan. Light irradiation device. The light irradiation device according to any one of claims 2 to 4.
The light emitting unit is a light irradiation device including a galvano mirror capable of changing the light emitting angle. A reading unit that can detect light with an optical sensor and change the incident angle of the detected light, which is the light to be detected,
The incident angle of the detection light changes in the division angle range at a point separated from the optical sensor by a certain distance along the detection light for each division angle range in which the incident angle range of the detection light is divided into a plurality of division angles. A reflective part that reflects light multiple times so that the arc chords, which are the trajectories drawn along with it, are in the same direction as the main scanning direction.
A control unit that controls reading in the reading unit by controlling the reading timing of the optical sensor,
With
In each of the divided angle ranges, when the reading range which is the locus of the reading position of the object when the incident angle of the detection light changes from one end to the other end of the divided angle range is considered, the above-mentioned adjacent to each other. The reading range partially overlaps in the main scanning direction between the division angle ranges.
The control unit controls the reading in the reading unit so as to selectively use the output of the optical sensor in the two division angle ranges in the portion where the reading ranges overlap. Reader. The optical reader according to claim 6.
A setting unit capable of setting reading in the reading unit is provided.
In each of the divided angle ranges, the setting unit has a reading start incident angle which is the incident angle at which the angle range allowed to be read by the optical sensor starts, and a reading which is the incident angle where the angle range ends. The end incident angle and can be set,
The control unit is an optical reading device that controls reading in the reading unit based on the reading start incident angle and the reading end incident angle. The optical reader according to claim 7.
In the portion where the reading ranges overlap, the reading position corresponding to the reading end incident angle in the divided angle range on one side and the reading corresponding to the reading start incident angle in the divided angle range on the other side. An optical reader, characterized in that the setting unit is set so that the position and the position match. The optical reader according to claim 7 or 8.
The control unit cuts out and cut out a pixel sequence obtained by the output of the optical sensor in one main scan based on the reading start incident angle and the reading end incident angle in each of the divided angle ranges. It is characterized in that the reading unit is controlled so as to acquire a pixel sequence corresponding to one main scan based on a rearranged pixel sequence generated by continuously arranging a plurality of pixel string pieces. Optical reader. The optical reader according to any one of claims 7 to 9.
The reading unit is an optical reading device including a galvano mirror capable of changing the incident angle of the detected light.

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