JPS62186213A - Adjusting method for autofocusing optical system - Google Patents

Abstract

PURPOSE:To easily measure pitching and yawing by comparing the outputs of two photodetecting part groups while rotating the 1st pupil unitedly with the two photodetecting part groups and relatively to the 2nd pupil. CONSTITUTION:When the 2nd pupil 12A is selected and arranged on a prescribed position and the 1st pupil 11 is rotated around the Y axis unitedly with the photodetecting part groups 17a, 17b, the conjugate image of the 1st pupil 11 is moved on the 2nd pupil 12A in the X direction. The quantity of light led into respective photodetecting part groups 17a, 17b is restricted by both the side edge parts 121a, 121b of a window hole 121 and the quantity of light restricted by the edge parts 121a, 121b is increased/decreased in the reverse directions each other by moving the conjugate image of the 1st pupil 11 on he 2nd pupil 12A in the X axis direction. When an integrating time is fixed and the inclination of the yawing direction is '0', analog outputs are obtained from respective photodetecting part groups 17a, 17b by setting up a part where the conjugate image of the 1st pupil 11 is hidden by the 2nd pupil 12A equally to an appearing part of the conjugate image and the adjustment of the yawing direction can be completed by always monitoring the analog outputs and setting up the outputs of both the photodetecting part groups 17a, 17b equally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an adjustment method for an autofocus optical system, and particularly to an adjustment method that allows easy adjustment of the inclination of a group of light receiving sections.

(Prior art) A condenser lens disposed behind the intended image formation plane of a subject image by a photographing lens, and first and second condensers disposed behind the condenser lens for guiding the subject image to a light receiving section. There is an autofocus optical system that includes first and second optical systems each including an image lens, and two light receiving unit groups that respectively receive object images guided by these optical systems.

In such an autofocus optical system, accurate autofocus cannot be performed unless the position and orientation of the light receiving unit group are set accurately in all directions. As shown in FIG. 2, factors that adversely affect the accuracy of autofocus include two light receiving unit groups 17a and 1, which are formed by arranging light receiving cells in a straight line.
If the arrangement direction of the light receiving cells 7b is X, the direction perpendicular to this is Y, and the 0 direction of the optical axis of the condenser lens 15 is Z, the light receiving unit groups 17a and 17b are arranged in the X direction, the Y direction, and the Z direction.
There are cases where the deviation occurs linearly in the direction, and cases where the deviation occurs due to rotation around axes in the X direction, Y direction, and Z direction.

Among the above various deviations of the light receiving unit groups 17a and 17b, X
The deviation in the direction of rotation about the axis in the Y direction, that is, the inclination, is called a pinch. The deviation in the direction of rotation, that is, the inclination, about the axis in the Y direction is called yaw. Adjustments in each of these directions are pinch adjustments, This is called yaw adjustment.

As a method of pitch adjustment in conventional autofocus optical systems, TCL TECHNICAL BULL
ETIN#17 SEPTEMBER1982J (
Ironeywell VISITRONIC・DEN
VER, CO, ") has been proposed. This method uses a semicircular pupil, and first, an image of the subject is introduced into the first optical system that guides the subject image to the light receiving section. The integration time of the first light receiving unit group made of CCD is measured with the semicircular pupil placed in the pupil, and then the pupil is rotated 180 degrees and placed in the second optical system, and the second photodetector group made of CCD is placed in the second optical system. The integration time of the light-receiving unit group is measured, and repeated measurements and adjustments are made so that both of the measured integration times are equal within a range of ±10%.

According to the above-mentioned conventional adjustment method, it is troublesome to measure at least twice to check the pitch of the light-receiving unit group, and it is difficult to understand intuitively because the pitch is adjusted from the integration time. The problem was that it was not possible to see changes in pitch in real time, making adjustments difficult.

(Objective) An object of the present invention is to easily measure the pitch and yaw in pitch and yaw adjustment in an autofocus optical system, and to provide two light receiving unit groups provided in the first and second optical systems. You can intuitively see the pitch or yaw deviation from the deviation in the output of the An object of the present invention is to provide a possible adjustment method for an autofocus optical system.

(Structure) A method for adjusting an autofocus optical system according to the present invention includes arranging a first pupil in a first optical system and a second optical system to respectively limit light to two light receiving unit groups, and A second pupil that limits the amount of light to the first pupil is disposed, and the first pupil is integrally rotated with the two light receiving groups while rotating relative to the second pupil. The present invention is characterized in that the inclinations of the two groups of light receiving sections are adjusted by comparing the outputs from the two groups of light receiving sections.

Embodiments of the method for adjusting an autofocus optical system according to the present invention will be described below with reference to the drawings.

In Figures 1 and 2, a photographing lens (not shown)
A condenser lens 15 is located behind the expected image formation plane 14.
is arranged, and an imaging lens 16 is arranged behind the condenser lens 15. The imaging lens 16 includes a first imaging lens 16a forming a first optical system that guides a subject image focused on the planned imaging surface 14 to a light receiving section, and a second imaging lens forming a second optical system. Consisting of 16b. A first light receiving unit group 17a and a second light receiving unit group 17b each having light receiving cells arranged in the arrangement direction of the first and second imaging lenses 16a and 116b are arranged behind the first and second imaging lenses 16a and 116b. These light receiving unit groups 17a and 17b are the first and second light receiving unit groups, respectively.
It receives a subject image guided by imaging lenses 16a and 16b forming the optical system.

Light receiving unit group 17a in the autofocus optical system
, 17b, when adjusting the pitch and yaw of the imaging lens l.
The first pupil 11 is arranged in close contact with the front side of the ea, 16b, the second pupil 12 is arranged at the position of the conjugate image with respect to the condenser lens 12 of this first jiill, and the second pupil 12 is arranged just before the second pupil 12. A diffuser plate 13 is placed at. The first pupil 11
As shown in FIG. 3, each imaging lens 16
Longitudinally long oval window holes 11a and llb are formed at positions facing the light receiving sections 11a and 16b, respectively, so as to restrict light to the two light receiving unit groups 17a and 17b, respectively. The second pupil 12 limits the amount of light from the first pupil 11, and pupils of different shapes are used for pitch adjustment and yaw adjustment. FIG. 4 shows an example of the second pupil used for yaw adjustment, and FIG. 5 shows an example of the second pupil used for pitch adjustment. The 1ffi 12A for yaw adjustment shown in FIG. 4 has a vertically elongated rectangular hole 121 in the center. The pitch adjustment pupil 12B shown in FIG. 5 has two apertures 1 symmetrical about the center point.
It has 22.123.

Here, the pinch is the inclination of the autofocus optical system with the X-axis and the Y-axis as the rotation axis, and the rotation axis is located at the center point A of the planned imaging plane 14. X axis or Y axis including this center point A
When rotating around the axis, the light receiving unit groups 17a, 17
b. The imaging lens 16, the first pupil 11, and the condenser lens 15 are rotated integrally while maintaining their relative positions, whereas the second pupil 12 and the diffuser plate 13 are not moved.

Now, the pupil 1 as shown in Figure 4 as the second pupil.
2A is selected and placed in a predetermined position, and the first pupil 11 is integrally rotated around the Y axis together with the light receiving unit groups 17a and 17b, as shown in FIG. 1's eyes 1
1 moves on the second pupil 12A in the left-right direction, that is, in the X-axis direction. At this time, each light receiving unit group 17a, 17b passes through the two windows 11a, llb in the first pupil 11.
The amount of light guided is limited by both side edges 121a and 121b of the window 121 of the second pupil 12A. Furthermore, as the conjugate image of the first pupil 11 moves in the X-axis direction on the second pupil 12A as described above, the amount of light limited by both side edges 121a and 121b of the window hole 12a becomes opposite to each other. Increase or decrease in the direction. Here, when the integration time is kept constant and the slope in one direction is 0, the part of the conjugate image of the first llff 111 that is hidden by the second pupil 128 is made equal to the part that appears. If set to 1, each light receiving unit group 1
Analog outputs as shown in FIG. 8 are obtained from 7a and 17b. By constantly monitoring this output, you can see the rotation in one direction in real time. and,
Adjustment in one direction is completed by setting the position where the outputs of both light receiving unit groups 17a and 17b are equal. first eye 1
The second window hole 11a and the second window hole 11a with respect to the vertical length of llb
Vertical edge 121a of window 121 of pupil 12A, 1
Since the length of 21b is sufficiently long, some Y when adjusting the yaw
Rotation in the axial direction does not affect the output.

On the other hand, in place of the second pupil 12A, the second pupil 12B shown in FIG. When rotated around the X axis, the first
The conjugate image of the pupil 11 moves on the second pupil 12B in the Y-axis direction. The amount of light guided to each light receiving unit group 17a, 17b through the windows 11a, llb of the first pupil 11 is determined by
22a, 122b. Further, as the conjugate image of the first pupil moves along the second axis in the Y-axis direction, the amount of light guided to the two light receiving unit groups 17a and 17b increases and decreases in opposite directions. Therefore, in this case as well, the conditions are set in the same way as in the case of adjustment in one direction, and each light receiving unit group 17a, 17
If you look at the output of point b, you will get the output as shown in FIG.
Adjustment in the pitch direction is completed by setting the positions where the outputs of 17b are equal. Even if the pitch is slightly rotated in the X-axis direction during pitch adjustment, the output will not be affected.

In this way, according to the above embodiment, when adjusting the pitch or the yaw direction, the output of each light receiving section group can be measured simultaneously, and the pitch or yaw direction can be adjusted based on the difference in the output of each light receiving section group. Since the inclination can be seen intuitively and changes in pitch or yaw during adjustment can be seen in real time, the inclination in one direction of pitch and yaw can be easily measured and adjusted.

Note that the shapes of the first pupil and the second pupil are not limited to those of the illustrated embodiment. For example, the shape of the first pupil window may be circular or square, and the second pupil window may have at least an edge that limits the conjugate image of the first pupil.

Further, even if the device has only one of the pinch and yaw adjustments, the unique effects of the present invention can be achieved and the present invention falls within the technical scope of the present invention.

(Effect) According to the present invention, when adjusting the pinch or tilt of the autofocus optical system in one direction, the first pupil that limits light to the two light receiving unit groups is connected to the first and second optical systems. In addition, a second pupil is arranged to limit the amount of light to the first pupil, and the first pupil is rotated integrally with the two light receiving unit groups relative to the second pupil. However, by comparing the outputs of the two light-receiving sections, the pitch or yaw direction is adjusted, so the outputs of the first and second optical systems can be viewed simultaneously, and the pitch or yaw direction is adjusted. You can intuitively understand the inclination, and you can also see changes in the inclination in one direction, pitch or yaw, in real time during adjustment. Therefore, it is possible to provide an adjustment method for an autofocus optical system that is easy to measure and adjust.

[Brief explanation of drawings]

FIG. 1 is an optical layout diagram showing an embodiment of the method for adjusting an autofocus optical system according to the present invention, FIG. 2 is a perspective view of the main parts of the same embodiment, and FIG. 4 is a front view showing an example of the second pupil used in the above embodiment, FIG. 5 is a front view showing another example of the second pupil, and FIG. 6 is a front view showing an example of the second pupil used in the above embodiment. is a front view showing the overlapping state of images formed when the second pupil shown in Fig. 4 is used, and Fig. 7 is a front view when the second pupil shown in Fig. 5 is used. FIG. 8 is a front view showing an overlapping state of images formed in FIG. 11--first pupil, 12--second pupil, 17a,
17b-light receiving unit group.

Claims (1)

[Claims] It has a first optical system that guides the subject image to the light receiving section, a second optical system that also guides the subject image to the light receiving section, and two light receiving section groups that respectively receive the subject images guided by these optical systems. A method for adjusting an autofocus optical system, comprising: arranging a first pupil in the first optical system and the second optical system to respectively limit light to the two light receiving unit groups; A second pupil is arranged to limit the amount of light to the first pupil,
The inclinations of the two light receiving groups are adjusted by comparing the outputs from the two light receiving groups while rotating the first pupil integrally with the two light receiving groups relative to the second pupil. How to adjust the autofocus optical system.