JP4420120B2 - Adjusting method of imaging apparatus - Google Patents

Description

  The present invention relates to an adjustment method of an imaging apparatus that is used in, for example, a scanner or an optical character reader (hereinafter referred to as “OCR”) and optically detects an image pattern such as a form.

  For example, in an OCR or the like, an imaging device (for example, an optical pattern detection unit) that optically detects an image pattern of a form with respect to the form in the sub-scanning direction orthogonal to the main scanning direction of the imaged surface of the form. A light source that emits line-shaped emitted light in the main scanning direction while moving relatively is provided. The line-shaped light from the light source is irradiated in the main scanning direction of the imaging surface of the form. The line-shaped light transmitted or reflected through the form is reflected by a reflecting mirror, and the reflected light is collected by a lens on a light receiving surface of an imaging means (for example, a charge coupled device, hereinafter referred to as “CCD”). . The reflected light collected on the light receiving surface is scanned in the main scanning direction by the CCD, and an image pattern is detected.

  When manufacturing this optical pattern detection unit, it is almost impossible to assemble so that the mounting direction of the reflecting mirror, the mounting direction of the CCD, and the magnification become design values. Therefore, it is necessary to adjust the mounting direction of the reflecting mirror, the mounting direction of the CCD, and the magnification after the production is completed. When these adjustments are made, an adjustment jig serving as a reference for adjustment is used instead of a form, and the output signal of the CCD is observed with an oscilloscope or the like, and is performed on a trial and error basis.

  Examples of conventional literature relating to such an adjustment method include the following.

JP-A-5-122443

  However, the conventional methods for adjusting the optical pattern detection unit have the following problems (i) to (iv).

  (I) When adjusting the magnification, the adjustment is made by trial and error using an adjustment jig, so that adjustment takes time and adjustment errors are likely to occur.

  (Ii) Since adjustment is made by trial and error while shifting the position of the adjustment jig when adjusting the angle of the reflecting mirror, adjustment takes time and adjustment errors are likely to occur.

  (iii) When adjusting so that the direction of the light receiving surface of the CCD is in the main scanning direction, adjust the position of the adjustment jig by trial and error so that output can be obtained simultaneously from each element of the CCD. Therefore, adjustment takes time and adjustment errors are likely to occur.

  (Iv) When paper is used as the material for the adjustment jig, an adjustment error occurs due to the deterioration of the adjustment jig.

  The object of the present invention is to solve the above-mentioned problems (i), (iii), and (iv).

The invention according to claim 1 of the present invention is provided at a position spaced apart from the imaging surface of the translucent or light-reflective imaging object and is orthogonal to the main scanning direction of the imaging surface. A light source that irradiates linearly emitted light in the main scanning direction while moving relative to the imaging object in the scanning direction; and linear transmitted light that is transmitted or reflected from the imaging object, or Reflecting means for reflecting the reflected light in a predetermined direction and emitting a line-shaped reflected light, and a position for receiving the line-shaped reflected light emitted from the reflecting means, and collecting the reflected light An image forming means for forming an image surface at an image forming position at a predetermined distance from the image pickup surface, and a light receiving surface whose light receiving direction can be adjusted with respect to the image forming position are provided and condensed by the image forming means. The received reflected light is received by the light receiving surface, and the reflected light is scanned in the main scanning direction. Imaging means for converting an electrical signal for each pixel Te, the imaging device including a calculating means for performing predetermined arithmetic processing for each pixel with respect to the electric signal in the main scanning direction and the subscanning direction The following processing is performed.

An area that allows an error with respect to a set value in the direction of the light receiving surface and extends in the main scanning direction with a first width in the sub-scanning direction and a first length in the main scanning direction. The adjustment target object having a translucent part or a reflective part for the light emitted from the light source is used as the imaging target object, and the reflected light transmitted through the translucent part or reflected light reflected by the reflective part is used as the reflecting means. And the imaging means via the imaging means sequentially, and a threshold value is set for the waveform of the electrical signal output from the imaging means, and two points at which the waveform of the electrical signal and the threshold value intersect The pixel position of the pixel is detected, the inter-pixel distance is obtained from the pixel position of the two pixels by the calculating means, and when the inter-pixel distance is smaller than a predetermined value, the inter-pixel distance is the predetermined value. to adjust the light receiving direction of the light-receiving surface such that It is.

The invention according to claim 2 is provided at a position spaced apart from the imaging surface of the translucent or light reflective imaging object, and in the sub-scanning direction orthogonal to the main scanning direction of the imaging surface, A light source that emits line-shaped outgoing light in the main scanning direction while moving relative to the object to be imaged, and a line-shaped transmitted light or reflected light transmitted or reflected from the object to be imaged in a predetermined direction And reflecting means for reflecting the line-shaped reflected light and a position for receiving the line-shaped reflected light emitted from the reflecting means, and collecting the reflected light from the surface to be imaged. an imaging means for imaging the image plane at the imaging position at a predetermined distance, the light-receiving surface is provided on the image forming position, and receives the reflected light condensed by the imaging means at the photodetection surface, the Imaging means for converting reflected light into an electrical signal for each pixel by scanning in the main scanning direction In the imaging apparatus and a calculation means for performing predetermined arithmetic processing for each pixel with respect to the electric signal in the main scanning direction and the sub-scanning direction, to perform the following processing.

A predetermined area in the main scanning direction and the sub scanning direction, the first width to the sub-scanning direction, and extending in the main scanning direction with a first length in the main scanning direction An adjustment object having a translucent part or a reflective part for the light emitted from the light source is used as the imaging object, and the reflected light transmitted through the translucent part or reflected light reflected by the reflective part is reflected on the reflecting means and The imaging means sequentially receives light through the imaging means, sets a threshold value for the waveform of the electrical signal output from the imaging means, and two points at which the waveform of the electrical signal and the threshold value intersect The pixel position of the pixel is detected, and the calculation means determines the inter-pixel distance from the pixel positions of the two pixels, and further calculates the magnification by dividing the inter-pixel distance by the first length, When the magnification is smaller than the predetermined value, the magnification becomes the predetermined value And to adjust the urchin position of the imaging means.

The invention according to claim 3 is provided at a position spaced apart from the imaging surface of the translucent or light reflective imaging object, and in the sub-scanning direction orthogonal to the main scanning direction of the imaging surface, A light source that emits line-shaped outgoing light in the main scanning direction while moving relative to the object to be imaged, and a line-shaped transmitted light or reflected light transmitted or reflected from the object to be imaged in a predetermined direction And reflecting means for reflecting the line-shaped reflected light and a position for receiving the line-shaped reflected light emitted from the reflecting means, and collecting the reflected light from the surface to be imaged. An image forming means for forming an image surface at an image forming position at a predetermined distance; a light receiving surface provided at the image forming position; and the reflected light collected by the image forming means is received by the light receiving surface; Imaging means for converting reflected light into an electrical signal for each pixel by scanning in the main scanning direction In the imaging apparatus and a calculation means for performing predetermined arithmetic processing for each pixel with respect to the electric signal in the main scanning direction and the sub-scanning direction, to perform the following processing.
An adjustment object having a light transmission part or a reflection part for the emitted light of the light source formed in a predetermined region in the main scanning direction and the sub-scanning direction is used as the imaging object, and the light transmission part is transmitted. The transmitted light or the reflected light reflected by the reflecting portion is received by the imaging means sequentially via the reflecting means and the imaging means, and the arithmetic means outputs the electrical signal output from the imaging means. An adjustment method for an imaging apparatus that obtains an error with respect to a set value of the position of the imaging unit by performing the predetermined calculation process for each pixel, and adjusts the position of the imaging unit based on the error, The first pixel position in the main scanning direction that takes a value equal to or greater than a predetermined value of the electrical signal converted by the imaging means is determined as a reading start position for the adjustment object. To have.

According to the first aspect of the present invention, the inter-pixel distance is obtained by the calculation means, and when the inter-pixel distance is smaller than the predetermined value, the light receiving direction of the light receiving surface is set so that the inter-pixel distance becomes the predetermined value. Therefore, the image pickup apparatus can be accurately adjusted.

According to the second aspect of the present invention, the inter-pixel distance is obtained by the computing means, and the magnification is obtained by dividing the inter-pixel distance by the first length. When the magnification is smaller than the predetermined value, Since the position of the imaging means is adjusted so that the magnification becomes the predetermined value , the image pickup apparatus can be accurately adjusted.

  According to the third aspect of the present invention, the reading start position and the end position are obtained by calculation based on the electric signal of the image pickup means without adjusting the position of the image pickup means in the main scanning direction. Can be adjusted accurately.

  The best mode for carrying out the invention will become apparent from the following description of the preferred embodiments when read in conjunction with the accompanying drawings. However, the drawings are only for explanation and do not limit the scope of the present invention.

  FIG. 1 is a configuration diagram of an imaging apparatus for carrying out the adjustment method of the imaging apparatus according to the first embodiment of the present invention.

In this imaging apparatus, a line-shaped light source 1 is provided at a position spaced apart from an imaging target surface of an imaging object (for example, an adjustment sheet) SH by a predetermined distance. The light source 1, the main scanning direction of the imaging surface of the adjusting sheet SH (i.e., perpendicular to the plane of FIG. 1) main while moving relative to the control sheet SH in the sub-scanning direction perpendicular to the The line-shaped emitted light is irradiated in the scanning direction. The position of the adjustment sheet SH is fixed by the positioning portions 2 a and 2 b of the housing 2. The line-shaped transmitted light ph1 transmitted from the adjustment sheet SH is transmitted through the transmission window 2c of the housing 2 and sequentially enters the reflecting means (for example, mirrors) 3 and 4. The mirrors 3 and 4 reflect the transmitted light ph1 in a predetermined direction and emit the line-shaped reflected light ph4.

  An imaging means (for example, a lens) 5 is provided at a position where the reflected light ph4 is received. The lens 5 focuses the reflected light ph4 to form an image plane at an imaging position at a predetermined distance from the imaging target surface of the adjustment sheet SH. An imaging means (for example, CCD) 6 is provided so that the light receiving surface is positioned at this image formation position. The CCD 6 is attached to a control board 7 having a CCD drive circuit or the like, receives the reflected light ph4 collected by the lens 5 at the light receiving surface, and scans the reflected light ph4 in the main scanning direction based on the control of the control board 7. By doing so, it is converted into an electric signal S6 for each pixel. The readable range of the CCD 6 is set to be larger than the visual field range in the main scanning direction and the shift amount due to manufacturing errors when an image is formed by the lens 5. The distance between the mirror 4 and the lens 5 is variable, and the magnification can be adjusted by moving the lens 5 and the CCD 6 in the sub-scanning direction.

  The electric signal S6 is input to a calculation means (for example, a calculation unit) 9. The calculation unit 9 performs predetermined calculation processing for each pixel on the electric signal S6 in the main scanning direction and the sub-scanning direction, and outputs an output signal S9 representing the processing result. A display device (not shown) for displaying the processing result is connected to the output side of the calculation unit 9.

FIG. 2 is an enlarged plan view of the imaging apparatus of FIG.
The mirror 3 has shafts 3 a and 3 b that can rotate with respect to the housing 2, and is fixed to the housing 2 by an adjustment mechanism portion including a fixing metal fitting 3 c and a screw 3 d.

FIG. 3 is a configuration diagram of the adjustment mechanism unit in FIG. 2.
The fixture 3c has an adjustment hole 3e and is fixed to the shafts 3a and 3b.
FIG. 4 is an enlarged right side view of the imaging apparatus of FIG.

  The control board 7 has mounting position adjusting holes 7a and 7b, and is fixed to the housing 2 by screws 8a and 8b.

FIG. 5 is an enlarged configuration diagram of the adjustment sheet SH in FIG. 1.
The adjustment sheet SH is formed of a rigid member that shields light (for example, a thin iron plate or resin), and transmits light transmitting portions 11, 12, and 13 that transmit light emitted from the light source 1, and a positioning portion 2 a of the housing 2. , 2b and positioning holes 14a, 14b, 15a, 15b, 16a, 16b. A medium such as paper that easily diffuses light is affixed to each of the light transmitting portions 11, 12, 13 and the positioning holes 14a, 14b, 15a, 15b, 16a, 16b. The light transmitting portion 11 transmits light through a portion having a first length in the visual field range L1 in the main scanning direction G and a first width in the sub scanning direction N , and the positioning holes 14a and 14b are positioned in the positioning portion 2a. , 2b, it is arranged at the position of the transmission window 2c of the housing 2. The translucent part 12 has a light shielding part 12a that shields light at a distance L2 from the end in the main scanning direction G and at a position Q in the sub-scanning direction N, and transmits light in other parts. When the positioning holes 15a and 15b are fitted in the positioning portions 2a and 2b, the positioning holes 15a and 15b are arranged at the position of the transmission window 2c . The translucent part 13 is formed with a first length L3 in the main scanning direction G and a first width L4 in the sub-scanning direction N, and adjusts the inclination of the direction of the line of emitted light from the light source 1 with respect to the main scanning direction G. The angle θ of the range is
θ = Tan ⁻¹ (L4 / L3)
When the positioning holes 16a and 16b are fitted in the positioning portions 2a and 2b, they are arranged at the position of the transmission window 2c .

  FIGS. 6A, 6B, 6C, and 6D are diagrams showing the relationship between the light transmitting portion 12 in FIG. 5 and the output signal S9 in FIG. 1, and FIG. The relationship between the translucent part 12 and the reading positions A, B, and C is shown, and the output signals S9 at the reading positions A, B, and C are shown in (b), (c), and (d) of FIG. It is shown. FIG. 7 is a diagram for explaining the error angle θ.

  A method for adjusting the angle of the mirror 3 in the imaging apparatus of FIG. 1 will be described with reference to FIGS.

  The light source 1 is caused to emit light in a state where the positioning holes 15a and 15b of the adjustment sheet SH are fitted to the positioning portions 2a and 2b. The light emitted from the light source 1 passes through the light transmitting part 12 of the adjustment sheet SH and is emitted as transmitted light ph1. The transmitted light ph1 is sequentially reflected by the mirrors 3 and 4, collected by the lens 5, and imaged on the light receiving surface of the CCD 6.

Here, the slice value sl of the output signal S9 is set, and the value of the pixel position where the slice value sl intersects the waveform of the output signal S9 is defined as the pixel position ia, ib, ic, id. The central position Lc of the translucent part 12 at this time is expressed by the following formula (1).
Lc = (ia + id) / 2 (1)
The central position L1c of the light shielding part 12a is expressed by the following equation (2).
L1c = (ib + ic) / 2 (2)

When the reading position is at position A as shown in FIG.
Lc = L1c (3)
Thus, the angle of the mirror 3 does not need to be adjusted.

When the reading position is at position B as shown in FIG.
Lc <L1c (4)
Thus, the angle of the mirror 3 is adjusted so that the reading position is the position A. In this case, the electrical signal S6 of the CCD 6 is read, the calculation unit 9 performs the calculation shown in the following equation (5), displays the calculation result on the display device, and adjusts the angle of the mirror 3 so that Lm becomes zero.
Lm = Lc−L1c (5)
Alternatively, the adjustment angle θ0 may be calculated using the following equations (6), (7), and (8), and the result may be displayed on the display device for adjustment.

When the distance from B to A is y1, the following equation (6) is obtained.
y1 = (y / x) Lm · δ (6)
However, δ: Length of one pixel The error angle θ in FIG. 7 is expressed by the following equation (7).
θ = Tan ⁻¹ (y1 / z) (7)
Therefore, the adjustment angle θ0 is expressed by the following equation (8).
θ0 = θ / 2 = (1/2) Tan ⁻¹ (y · Lm · δ / xz)
... (8)

  As shown in FIG. 6D, when the reading position is at the position C, the calculation similar to the expressions (5) to (8) is performed to adjust the angle of the mirror 3.

  As described above, in the first embodiment, the adjustment angle of the mirror 3 is obtained by the calculation based on the electric signal S6 of the CCD 6, so that the image pickup apparatus can be accurately adjusted. Furthermore, since the adjustment sheet SH is formed of a rigid member such as an iron plate, it is less affected by temperature and humidity than in the case where paper is used as in the prior art. Therefore, stable adjustment can be performed.

  FIGS. 8A, 8B, and 8C are diagrams showing the relationship between the translucent portion 13 in FIG. 5 and the output signal S9 in FIG. 1 showing the second embodiment of the present invention. (A) shows the relationship between the translucent portion 13 and the reading positions A and B, and (b) and (c) show the output signal S9 at the reading positions A and B, respectively. .

  In the second embodiment, a method for adjusting the tilt angle of the CCD 6 in the imaging apparatus of FIG. 1 will be described.

  The light source 1 is caused to emit light while the positioning holes 16a and 16b of the adjustment sheet SH are fitted to the positioning portions 2a and 2b. The light emitted from the light source 1 passes through the light transmitting portion 13 of the adjustment sheet SH and becomes transmitted light ph1. The transmitted light ph1 is sequentially reflected by the mirrors 3 and 4, collected by the lens 5, and imaged on the light receiving surface of the CCD 6. Here, the slice value sl of the output signal S9 is set, and the pixel position values where the slice value sl intersects the waveform of the output signal S9 are defined as pixel positions ia and ib.

If the reading position is at position A,
(Ib-ia) · δ = L4
Therefore, it is not necessary to adjust the direction of the light receiving surface of the CCD 6.

If the reading position is at position B,
(Ib-ia) · δ <L4
Therefore, it is necessary to adjust the direction of the light receiving surface of the CCD 6. The tilt angle Ψ of the CCD 6 at this time is expressed by the following equation (9).
Ψ = Tan ⁻¹ (L3 / (ib−ia) · δ) (9)
The value calculated by the equation (9) is displayed on the display device, and the tilt angle of the CCD 6 is adjusted based on this value.

  As described above, in the second embodiment, since the adjustment angle Ψ of the inclination of the CCD 6 is obtained by the calculation based on the electric signal S6 of the CCD 6, the image pickup apparatus can be accurately adjusted.

  FIG. 9 is a diagram for explaining the collection of the reflected light ph4 by the lens 5 according to the third embodiment of the present invention, and FIG.

In the third embodiment, a method for adjusting the magnification in the imaging apparatus of FIG. 1 will be described.
The light source 1 is caused to emit light in a state where the positioning holes 14a and 14b of the adjustment sheet SH are fitted to the positioning portions 2a and 2b. The light emitted from the light source 1 passes through the light transmitting portion 11 of the adjustment sheet SH and becomes transmitted light ph1. The transmitted light ph1 is sequentially reflected by the mirrors 3 and 4, collected by the lens 5, and imaged on the light receiving surface of the CCD 6 as shown in FIG. At this time, the output signal S9 of the arithmetic unit 9 has a value as shown in FIG.

When the slice value sl of the output signal S9 is set, and there is a value exceeding the slice value sl from the pixel i to the pixel i + j, the range of CCD light focused on the CCD 6 is expressed by the following equation (10).
LCCD = (i− (i + j)) · δ = jδ (10)
Where j is the number of pixels
δ: Length of one pixel

If the design light range is LCCD0 (= kδ), the magnification can be obtained by the following method.
The design magnification Md is expressed by the following equation (11).
Md = LCCD0 / L1 (11)
The actual magnification Me is expressed by the following equation (12).
Me = LCCD / L1 (12)

The moving distance ΔL between the lens 5 and the CCD 6 is expressed by the following equation (13).
ΔL = f · (1 / Md−1 / Me) + f · (Md−Me)...
However,
f: Focal length of lens 5
f · (1 / Md−1 / Me); adjustment sheet SH to lens 5
Optical distance to
f · (Md−Me); Optical distance from the lens 5 to the CCD 6 Usually, since LCCD0 << L1,
f · (1 / Md−1 / Me) >> f · (Md−Me)
And the term f · (Md−Me) is negligible. Therefore, the equation (13) can be expressed as the following equation (14).
ΔL ≠ f · (1 / Md-1 / Me)
= F ・ L1 ・ (LCCD−LCCD0) / (LCCD ・ LCCD0)
= F · L 1 (j−k) / δ · j · k (14)

  The movement distance ΔL of the lens 5 and the CCD 6 is calculated by the expression (14) and displayed on the display device. The magnification is adjusted by moving the lens 5 and the CCD 6 together by the moving distance ΔL.

  As described above, in the third embodiment, since the movement distance ΔL between the lens 5 and the CCD 6 is obtained by calculation based on the electrical signal S6 of the CCD 6, accurate adjustment of the imaging apparatus can be performed.

  In the fourth embodiment, after the magnification adjustment in the third embodiment, the light source 1 emits light in a state where the positioning holes 14a and 14b of the adjustment sheet SH are fitted to the positioning portions 2a and 2b, and the output signal S9 shown in FIG. obtain. When the slice value sl of the output signal S9 is set and there is a value exceeding the slice value sl from the pixel i to the pixel i + j, the pixel i to the pixel i + j are held in the nonvolatile storage means, and the position of the pixel i Is used as the reading start position of the adjustment sheet SH. Therefore, it is not necessary to adjust the position of the CCD 6 in the main scanning direction G.

  As described above, in the fourth embodiment, the reading start position and the end position are obtained by the calculation based on the electric signal S6 of the CCD 6 without adjusting the position of the CCD 6 in the main scanning direction G. Accurate adjustment of the device can be made.

In addition, this invention is not limited to the said Example, A various deformation | transformation is possible. Examples of such modifications include the following.
(A) The number of the mirrors 3 and 4 in FIG. 1 may be increased or decreased as necessary.
(B) The lens 5 in FIG. 1 may be other imaging means such as a rod lens array.
(C) In the embodiment, the imaging apparatus has been described as a translucent type in which the light source 1 is outside the housing 2. The same operation and effect as the example can be obtained. In this case, an image pickup object for adjustment having a reflection part and a non-reflection part is used.

It is a block diagram of the imaging device of Example 1 of this invention. FIG. 2 is an enlarged plan view of the imaging device in FIG. 1. It is a block diagram of the adjustment mechanism part in FIG. It is an expansion right view of the imaging device of FIG. FIG. 2 is an enlarged configuration diagram of an adjustment sheet SH in FIG. 1. It is a figure which shows the relationship between the translucent part 12 in FIG. 5, and the output signal S9 in FIG. It is a figure explaining error angle (theta). It is a figure which shows the relationship between the translucent part 13 in FIG. 5 of Example 2 of this invention, and the output signal S9 in FIG. It is a figure explaining the condensing by the lens 5 of Example 3 of this invention. It is a figure which shows the output signal S9 in FIG.

Explanation of symbols

1 Light source 3, 4 Mirror 5 Lens 6 CCD
9 Arithmetic unit 11, 12, 13 Light transmitting unit 12a Light blocking unit SH Adjustment sheet ph1 Transmitted light ph4 Reflected light G Main scanning direction N Sub scanning direction

Claims (3)

Relative to the imaging object in a sub-scanning direction orthogonal to the main scanning direction of the imaging surface, provided at a predetermined distance from the imaging surface of the translucent or light reflection imaging object A light source that emits line-shaped outgoing light in the main scanning direction while moving to
Reflecting means for reflecting the line-shaped transmitted light or reflected light transmitted or reflected from the imaging object in a predetermined direction and emitting the line-shaped reflected light;
An image forming unit that is provided at a position to receive the line-shaped reflected light emitted from the reflecting unit, and that focuses the reflected light to form an image plane at an imaging position at a predetermined distance from the imaging surface. Means,
A light receiving surface whose light receiving direction can be adjusted with respect to the image forming position is provided, and the reflected light collected by the image forming means is received by the light receiving surface, and the reflected light is scanned in the main scanning direction. Imaging means for converting into an electrical signal for each pixel by
In the image pickup apparatus and a calculation means for performing predetermined arithmetic processing for each pixel with respect to the electric signal in the main scanning direction and the subscanning direction,
An area that allows an error with respect to a set value in the direction of the light receiving surface and extends in the main scanning direction with a first width in the sub-scanning direction and a first length in the main scanning direction. Using an object to be adjusted having a light transmitting part or a reflecting part for the emitted light of the light source as the imaging object,
The translucent portion of the reflected light reflected by the transmitted transmission light or the reflection portion through said reflecting means and said image forming means sequentially received by the image pickup means, of the electric signal output from the image pickup means A threshold is set for the waveform, the pixel positions of two pixels where the waveform of the electrical signal and the threshold intersect are detected, and the inter-pixel distance is obtained from the pixel positions of the two pixels by the calculation means. When the distance between the pixels is smaller than a predetermined value, the light receiving direction of the light receiving surface is adjusted so that the distance between the pixels becomes the predetermined value . Relative to the imaging object in a sub-scanning direction orthogonal to the main scanning direction of the imaging surface, provided at a predetermined distance from the imaging surface of the translucent or light reflection imaging object A light source that emits line-shaped outgoing light in the main scanning direction while moving to
Reflecting means for reflecting the line-shaped transmitted light or reflected light transmitted or reflected from the imaging object in a predetermined direction and emitting the line-shaped reflected light;
An image forming unit that is provided at a position to receive the line-shaped reflected light emitted from the reflecting unit, and that focuses the reflected light to form an image plane at an imaging position at a predetermined distance from the imaging surface. Means ,
A light receiving surface is provided at the image forming position, the reflected light collected by the image forming means is received by the light receiving surface, and the reflected light is scanned in the main scanning direction to generate an electric signal for each pixel. Imaging means for conversion;
In the image pickup apparatus and a calculation means for performing predetermined arithmetic processing for each pixel with respect to the electric signal in the main scanning direction and the subscanning direction,
A predetermined area in the main scanning direction and the sub scanning direction, the first width to the sub-scanning direction, and extending in the main scanning direction with a first length in the main scanning direction Using an imaging object for adjustment having a translucent part or a reflection part for the emitted light of the light source as the imaging object,
The translucent portion of the reflected light reflected by the transmitted transmission light or the reflection portion through said reflecting means and said image forming means sequentially received by the image pickup means, of the electric signal output from the image pickup means A threshold is set for the waveform, the pixel positions of two pixels where the waveform of the electrical signal and the threshold intersect are detected, and the inter-pixel distance is obtained from the pixel positions of the two pixels by the calculation means. Further, the magnification is obtained by dividing the inter-pixel distance by the first length, and when the magnification is smaller than a predetermined value , the position of the imaging means is set so that the magnification becomes the predetermined value. An adjustment method for an imaging apparatus, wherein the adjustment is performed. Relative to the imaging object in a sub-scanning direction orthogonal to the main scanning direction of the imaging surface, provided at a predetermined distance from the imaging surface of the translucent or light reflection imaging object A light source that emits line-shaped outgoing light in the main scanning direction while moving to
Reflecting means for reflecting the line-shaped transmitted light or reflected light transmitted or reflected from the imaging object in a predetermined direction and emitting the line-shaped reflected light;
An image forming unit that is provided at a position to receive the line-shaped reflected light emitted from the reflecting unit, and that focuses the reflected light to form an image plane at an imaging position at a predetermined distance from the imaging surface. Means,
A light receiving surface is provided at the image forming position, the reflected light collected by the image forming means is received by the light receiving surface, and the reflected light is scanned in the main scanning direction to generate an electric signal for each pixel. Imaging means for conversion;
In an imaging apparatus comprising: a calculation unit that performs a predetermined calculation process for each pixel on the electrical signals in the main scanning direction and the sub-scanning direction;
Using an imaging object for adjustment having a light transmission part or a reflection part for the emitted light of the light source formed in a predetermined region in the main scanning direction and the sub-scanning direction, as the imaging object,
The transmitted light that has passed through the light transmitting part or the reflected light that has been reflected by the reflecting part is received by the image pickup means via the reflection means and the imaging means in order, and the electric signal output from the image pickup means is received. On the other hand, by performing the predetermined calculation process for each pixel by the calculation means, an error with respect to the set value of the position of the imaging means is obtained, and the position of the imaging means is adjusted based on the error An adjustment method,
Imaging and determining the first pixel position in the main scanning direction takes a predetermined value or more values of said electrical signal converted by the image pickup means, as a read start position relative to the adjustment object to be imaged Device adjustment method .

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