JPH08102818A - Adjustment chart for image pickup element optical unit, adjustment device and adjustment method - Google Patents

Abstract

PURPOSE: To give a large making area for shortening adjustment time and for measuring a focus over a wide range in a main scanning direction to an adjustment chart. CONSTITUTION: A first mark 12a which extends upward and downward from a reference line 14 in an auxiliary scanning direction, whose width linearly changes in the auxiliary scanning direction and which is provided with an edge E1 orthogonal to the reference line 14, and a second mark 13 provided with an edge E3 orthogonal to the reference line 14 are provided for the adjustment chart 11. Dislocation quantity in the auxiliary scanning direction is calculated by the width of the first mark 12a, dislocation quantity in the main scanning direction by the edge E1 and the error of a multiplying factor by a distance between the edge E1 (or edge E2) and the edge E3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chart for adjusting an optical unit of an image pickup device, an adjusting device and an adjusting method, and more particularly, to a charge-coupled device (Charge-Coupled D).
an image pickup device such as an image pickup device (hereinafter, referred to as CCD) and an image pickup device optical unit having a lens for forming an image on its image pickup surface, and an adjustment chart, an adjusting device, and an adjusting method for shortening measurement time. .

[0002]

2. Description of the Related Art As an adjustment chart of an image pickup element optical unit used in a conventional copying machine, facsimile, etc., there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 5-75797.
FIG. 7 shows this adjustment chart, in which the mark 70 serving as a reference (side resist) on the left side of the document position in the X-axis (main scanning) direction and the Z-axis (sub-scanning) direction and the Y-axis based on the width. The marks 71a and 71b for calculating the deviation amount (skew amount) of the rotation angle θ around the (vertical axis of the paper), and the mark 7
1a and 71b, marks 72a indicating the direction of the deviation amount,
72b, marks 73a and 73b serving as a reference for the Z-axis direction and the rotation angle θ, and a mark 7 for obtaining the focus (MTF).
4a and 74b, and marks 75a and 75b for requesting magnification
And marks 76a and 76b for calculating the rotation angle φ around the Z-axis from the difference in spacing between the marks 75a and 75b.

The above-mentioned adjustment chart is imaged on the image pickup device through the image formation lens, and the output signal waveform of the image pickup device is arithmetically processed by the arithmetic circuit.
A magnification error, a focus shift, etc. are detected, and an image pickup device is shifted or rotated through an appropriate drive circuit to fix the image pickup device at an appropriate position.

[0004]

However, according to the conventional adjustment chart, the magnification and the main scan (X
Since the marks for obtaining the positions in the (axis) direction and the sub-scanning (Z-axis) direction are independent, it is necessary to detect each mark to calculate the magnification and the positions in the main scanning direction and the sub-scanning direction. There is a problem that adjustment time becomes long. Further, since the number of marks is large, the mark area for focus measurement becomes narrow, and there is a problem that focus measurement cannot be performed over a wide range in the main scanning direction.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an adjustment chart, an adjusting device and an adjusting method for an image pickup device optical unit, which can shorten the adjustment time.

Another object of the present invention is to provide an adjusting chart, an adjusting device and an adjusting method for an image pickup device optical unit which provides a wide mark area for enabling focus measurement in a wide range in the main scanning direction. Is.

[0007]

SUMMARY OF THE INVENTION The present invention aims at shortening the adjustment time and providing a wide mark area for enabling focus measurement in a wide range in the main scanning direction. In the adjustment chart of the image sensor optical unit that adjusts the amount of positional deviation in the main scanning direction and the sub-scanning direction of the image sensor that reads the image, and the magnification thereof, it extends above and below the reference line in the sub-scanning direction and linearly in the sub-scanning direction. A first mark having a varying width and an edge orthogonal to the reference line; and a first mark having a predetermined distance from the first mark in the main scanning direction and having an edge orthogonal to the reference line. There is provided an adjustment chart for an image pickup device optical unit, which is provided with the second mark described above.

Further, according to the present invention, the adjustment time is shortened,
In order to provide a wide mark area to enable focus measurement in a wide range in the main scanning direction, the amount of positional deviation in the main scanning direction and the sub-scanning direction of the image sensor, such as a copying machine or a facsimile, which reads an original, and its magnification are determined. In the adjustment device of the image sensor optical unit to be adjusted, a width that extends above and below the reference line in the sub-scanning direction and linearly changes in the sub-scanning direction,
A first mark having an edge orthogonal to the reference line, and a second mark having an edge orthogonal to the reference line and arranged at a predetermined distance from the first mark in the main scanning direction. An adjustment chart including: a first mark signal and a second mark signal from the image sensor that read the adjustment chart; and the width obtained by processing the first mark signal. The positional shift amount in the scanning direction is calculated, and the positional shift amount in the main scanning direction is calculated from the position of the edge obtained by processing the first mark signal to obtain the first
And calculation means for calculating a magnification from the distance between the edges obtained by processing the second mark signal, display means for displaying the positional deviation amount and the magnification based on the calculation result of the calculation means, There is provided an adjusting device for an image pickup device optical unit, which is provided with an adjusting unit that adjusts a position of the image pickup device with respect to the adjustment chart based on a displacement amount and the magnification.

Further, according to the present invention, the adjustment time is shortened,
In order to provide a wide mark area to enable focus measurement in a wide range in the main scanning direction, the amount of positional deviation in the main scanning direction and the sub-scanning direction of the image sensor, such as a copying machine or a facsimile, which reads an original, and its magnification are determined. In the adjusting method of the image sensor optical unit to be adjusted, a width that extends above and below the reference line in the sub-scanning direction and linearly changes in the sub-scanning direction,
A first mark having an edge orthogonal to the reference line, and a second mark having an edge orthogonal to the reference line and arranged at a predetermined distance from the first mark in the main scanning direction. Reading an adjustment chart provided with the image sensor, and generating a first mark signal and a second mark signal by reading the adjustment chart,
A positional deviation amount in the sub-scanning direction is calculated from the width obtained by processing the first mark signal, and a positional deviation amount in the main scanning direction is obtained from the edge position obtained by processing the first mark signal. Is calculated and a magnification is calculated from the distance between the edges obtained by processing the first and second mark signals, and the position of the image sensor with respect to the adjustment chart is calculated based on the amount of positional deviation and the magnification. There is provided a method of adjusting an optical unit of an image sensor, the method comprising:

[0010]

When the image sensor reads the adjustment chart, the first
The width and edge signals of the mark and the edge signal of the second mark are output. The positional deviation amount in the sub-scanning direction is calculated from the comparison between the width of the first mark and the reference width, and the positional deviation amount in the main scanning direction is calculated from the comparison between the edge position of the first mark and the reference position. The error of the magnification is calculated by comparing the distance between the edge of the mark and the edge of the second mark with the reference distance.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The adjustment chart and adjusting device for an image pickup element optical unit according to the present invention will be described in detail below with reference to embodiments. FIG. 1 shows an adjustment chart 11 of an image pickup device optical unit in an embodiment of the present invention, in which a position in a main scanning direction and a sub scanning direction, and a magnification measurement mark (hereinafter,
The first mark 12a and 12b and the magnification measurement mark (hereinafter referred to as the second mark) 13 are provided. 1
Reference numeral 4 is a virtual reference line. First and second marks 12
a, 12b and 13 are, as shown in the drawing, edges E1 to E
6.

FIG. 2 is an enlarged view of the first mark 12a. Two triangles of the same size having two orthogonal sides of lengths A and B extend above and below the virtual reference line 14, Moreover, the hypotenuses are arranged so as to face each other at a predetermined interval. As is clear from the drawing, the first marks 12a are provided so that the virtual reference lines 14 that cross each triangle have the same length. First mark 1
The same applies to 2b.

FIG. 3 shows an image pickup device optical unit adjusting apparatus according to an embodiment of the present invention.
The adjustment chart 11 described above is placed, and the base plate 23 is fixed to the fixed portion 20a having the adjustment shafts 22a and 22b. Further, an imaging lens 21 is placed at a predetermined position of the mount 20.

On the other hand, CC facing the base plate 23
A substrate 25 having an image sensor 24 composed of a D sensor is located, and the adjustment rods 26a and 26b are supported by the support holes 27a and 2a.
7b, and is supported by the fastening screws 28a and 28b.
Fixed to 3.

In order to adjust the position of the substrate 25, an X-axis stage 29, a Y-axis stage 30, a Z-axis stage 31, and a θ rotation angle stage 32 are provided, and fastening screws 28a and 28b are provided at the uppermost position. Torque driver 3 to operate
A torque driver moving stage 34 that moves 3a and 33b is provided.

The substrate 25 is connected to a waveform processing circuit 35 for waveform-processing an image signal corresponding to a mark formed on the image pickup device 24. The waveform processing circuit 35 inputs the waveform-processed image signal and performs calculation. By doing so, it is connected to the arithmetic circuit 36 that calculates the amount of positional deviation of the substrate 25, and the arithmetic circuit 36 is connected to the control circuit 39 that performs predetermined control based on the calculation result of the amount of positional deviation.

The control circuit 39, to which the calculation result is input, drives each of the stages 29 to 32 and 34 via the drive circuit 37, and also displays the calculation result on the display (CRT or the like) of the display circuit 38.

Hereinafter, the operation chart of the adjustment chart of the image pickup element optical unit and the operation of the adjustment apparatus using the same according to the embodiment of the present invention will be described. When the adjustment chart 11 is irradiated with an irradiation lamp (not shown), a part of the first mark 12a of the adjustment chart 11 is formed by the imaging lens 21 on the corresponding element of the image pickup element 24 as shown in FIG. Image on. An image signal corresponding to the image forming portion of the mark 12a is output from the substrate 25 to the waveform processing circuit 35 and undergoes signal processing inside. The image signal subjected to the signal processing is subjected to the arithmetic processing in the arithmetic circuit 36, and the displacement amount of the image sensor 24 is calculated.

A straight line 24 in FIG. 2 indicates the position of the first mark 12a formed on the image sensor 24. In this image-forming state, the arithmetic circuit 36 performs the following arithmetic operations. Z = (B / A) × W1-B / 2-(1) Since W1 + W2 = A, if this is substituted into the equation (1), Z = (B / A) / 2 × (W1-W2) -(2) is obtained. Here, as is clear from the drawing, W1 and W2 are the lengths at which the straight line 24 intersects with each triangle, and are the projection widths formed on the image sensor 24.

When the displacement amount Z is calculated, the drive circuit 3
7 drives the Z-axis stage 31 to lower the image pickup device 24. This downward movement is continued until W1 = W2, that is, Z = 0. At the same time, the calculation result is displayed on the display of the display circuit 38. In this way, the image sensor 24
Is adjusted in the sub-scanning direction.

In the adjustment in the sub-scanning direction, the accuracy of position adjustment is improved by using the expression (2) rather than using the expression (1). In the expression (1), if the projection width W1 has an error, the error appears in the calculation result, but in the expression (2), even if the projection widths W1 and W2 have an error, they are offset.

Although the sub-scanning direction of the image pickup device 24 has been described above, other adjustment operations are performed as follows. (1) Adjustment in the main scanning direction The arithmetic circuit 36 calculates the deviation amount from the difference between the projected position of the first edge 12a of the left edge E1 on the image sensor 24 and the reference position, and inputs the arithmetic result. The circuit 39 drives the X-axis stage 29 via the drive circuit 37 according to the shift amount. Of course, the other edges E2 to E6 can also be used. (2) Adjustment of Magnification The arithmetic circuit 36 calculates the distance between the right edge E2 of the first mark 12a and the left edge E3 of the second mark 13. The error of the magnification is calculated from the difference between the projection distance on the image pickup device 24 and the reference distance, and the control circuit 39 which inputs the calculation result drives the Y-axis stage 30 via the drive circuit 37 to adjust the left magnification. adjust. The magnification on the right is Is measured and the overall magnification is Is measured. The other two distances between the edges selected from the edges E1 to E6 can be used in the same manner.

The torque driver moving stage 34 moves in the Y-axis direction based on the adjustment results of the main scanning direction, the sub-scanning direction and the magnification, and the torque drivers 33a and 33b fasten the fastening screws 28a and 28b. The substrate 25 is fixed to the base plate 23. Adjustment axis 2 even after fixing
By rotating 2a and 22b clockwise or counterclockwise, the distance between the base plate 23 and the substrate 25 can be adjusted to adjust the magnification.

FIGS. 4 to 6 are adjustment charts of the image pickup device optical unit according to another embodiment of the present invention.
The same parts as those in the adjustment chart are indicated by the same reference numerals, and the duplicate description will be omitted. The adjustment chart 11 of FIG. 4 is one in which ladder marks 15a and 15b for focus measurement are added, and as is clear from comparison with FIG.
Since the areas of the ladder marks 15a and 15b are wide, the focus can be measured over a wide range.

The adjustment chart 11 of FIG. 5 is one in which the second mark 13 is omitted and the ladder mark 15 is provided over a wide range, which can be used when adjusting only the overall magnification, and the mark is further simplified. Has been done.

The adjustment chart 11 of FIG. 6 is formed by combining the first marks 12a and 12b with triangles and rectangles, and can be used in the same manner as the adjustment chart 11 of FIG. That is, not only can the above-mentioned errors be canceled out, but if ΔW is positive when the projection width of the triangle is W1, the projection width of the rectangle is W2, and W1-W2 = ΔW, then the image sensor 24 moves in the sub-scanning direction. Is shifted upwards,
If ΔW is negative, it can be detected that the image sensor 24 is displaced downward in the sub-scanning direction. However, the width on the third triangular mark 14 is equal to W2. Also in this adjustment chart 11, as is clear from the calculation of W1-W2 = ΔW, the error in the projection width in the image sensor 24 can be canceled.

As is clear from the above description, the adjustment chart has, for example, triangles extending above and below the reference line in the sub-scanning direction and a predetermined distance from the reference line. By providing rectangles that extend above and below the reference line, it is possible to calculate the positional deviation amount and magnification error in the main and sub scanning directions, and it is possible to place the focus adjustment marks in the remaining wide area. Become.

[0028]

As described above, according to the adjusting chart, adjusting device, and adjusting method for the image pickup device optical unit of the present invention, it extends above and below the reference line in the sub-scanning direction and linearly extends in the sub-scanning direction. And a first mark having an edge that is orthogonal to the reference line and an edge that is disposed at a predetermined distance from the first mark in the main scanning direction and that is orthogonal to the reference line in the sub-scanning direction. Is provided on the adjustment chart, the amount of positional deviation in the sub-scanning direction from the width of the first mark, the amount of positional deviation from the edge of the first mark in the main scanning direction, and the first mark Since the error of the magnification is calculated from both edges of the second mark, the adjustment time can be shortened due to the reduction of the signal detection amount and the calculation amount, and a wide area for the focus measurement mark due to the reduction of the number of marks. Can give .

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an adjustment chart of an image pickup device optical unit according to an embodiment of the present invention.

2 is an explanatory diagram illustrating a calculation for obtaining a positional deviation amount in the sub-scanning direction based on the first mark of the adjustment chart of FIG.

FIG. 3 is an explanatory diagram showing an adjusting device for an image pickup element optical unit according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an adjustment chart of an image pickup element optical unit according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an adjustment chart of an image pickup element optical unit according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an adjustment chart of an image pickup element optical unit according to another embodiment of the present invention.

FIG. 7 is an explanatory view showing an adjustment chart of a conventional image sensor optical unit.

[Explanation of symbols]

 11--Adjustment chart 12a, 12b--First mark 13--Second mark 14--Virtual reference line 15, 15a, 15b--Ladder mark for focus 20--Mount 20a--Fixing part 21 --Image forming lens 22a, 22b --Adjustment axis 23 --Base plate 24 --Imaging element 25 --Substrate 26a, 26b --Adjustment rod 27a, 27b --Supporting hole 28a, 28b --Fastening screw 29-32 --Adjustment stage 33a, 33b --Torque driver 34 --Torque driver moving stage 35 --Waveform processing circuit 36 --Arithmetic circuit 37 --Drive circuit 38 --Display circuit 39 --Control circuit

Claims (3)

[Claims] 1. A reference line in the sub-scanning direction in a chart for adjusting an image-capturing device optical unit for adjusting the amount of positional deviation in the main-scanning direction and the sub-scanning direction of an image sensor for reading a document such as a copying machine, a facsimile, and the magnification thereof. A first mark having a width that extends vertically in the vertical direction and that changes linearly in the sub-scanning direction, a first mark having an edge orthogonal to the reference line, and a predetermined distance in the main scanning direction from the first mark. An adjustment chart of an image pickup device optical unit, which is provided with a second mark having an edge orthogonal to the reference line. 2. An adjusting device of an image pickup device optical unit for adjusting a position shift amount and a magnification thereof in a main scanning direction and a subscanning direction of an image pickup device for reading an original such as a copying machine or a facsimile, and a reference line in the subscanning direction. A first mark having a width that extends vertically and changes linearly in the sub-scanning direction, a first mark having an edge orthogonal to the reference line, and a predetermined distance in the main scanning direction from the first mark. The adjustment chart having a second mark having an edge orthogonal to the reference line;
Of the mark signal and the second mark signal, the positional deviation amount in the sub-scanning direction is calculated from the width obtained by processing the first mark signal, and the first mark signal is processed to obtain the positional deviation amount. Calculating means for calculating the amount of positional deviation in the main scanning direction from the position of the edge, and calculating the magnification from the distance between the edges obtained by processing the first and second mark signals; A display unit that displays the displacement amount and the magnification based on a calculation result; and an adjustment unit that adjusts the position of the image sensor with respect to the adjustment chart based on the displacement amount and the magnification. An image pickup device optical unit adjusting device. 3. A method of adjusting an image pickup element optical unit for adjusting a positional deviation amount of an image pickup element for reading a document such as a copying machine, a facsimile and the like in a main scanning direction and a subscanning direction and a magnification thereof, wherein a reference line in the subscanning direction is set. A first mark having a width that extends vertically and changes linearly in the sub-scanning direction, a first mark having an edge orthogonal to the reference line, and a predetermined distance in the main scanning direction from the first mark. A first chart obtained by reading an adjustment chart having a second mark having an edge orthogonal to the reference line by the image sensor, and processing the first mark signal by reading the adjustment chart. Generating a mark signal of
Position deviation amount in the sub-scanning direction is calculated from the width obtained by processing the mark signal, and the position deviation amount in the main scanning direction is calculated from the edge position obtained by processing the first mark signal. , Calculates a magnification from the distance between the edges obtained by processing the first and second mark signals, and adjusts the position of the image sensor with respect to the adjustment chart based on the amount of positional deviation and the magnification. An adjusting method of an image pickup element optical unit, comprising: