JP3745056B2 - Ranging position adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for adjusting a distance measuring device used in an imaging device such as a camera or a video, and more particularly to a distance measuring position adjusting device capable of accurate distance measurement and focus adjustment.
[0002]
[Prior art]
Conventionally, ranging devices used for cameras, etc., often use light, and are roughly divided into an “active method” that projects signal light from the device side and a “passive method” that uses the luminance distribution image of the object. Is done. Since the active method measures the position of reflected signal light, an optical position detection element called PSD is often used as a sensor. However, the passive method measures the amount of light at each light receiving position in order to view an image. Since it is necessary, a line sensor in which a plurality of optical sensors are arranged for each light receiving position is used.
[0003]
The present applicant has disclosed an adjustment technique for measuring a correct distance by such a passive distance measuring device in Japanese Patent Laid-Open No. 2-226108. This technique is a technique for taking measures against a difference between a subject such as a person to be actually measured and a chart used in an adjustment process. These distance measuring devices apply the principle of triangulation, and the adjustment of the mounting and positioning of these sensors is an important technique for determining the performance of the distance measuring device.
[0004]
In the active method, since the signal light is projected, the direction of distance measurement from the position can be easily monitored. However, in the passive method, it is difficult to detect even the direction of the sensor array. Therefore, it was necessary to devise such an attaching method and a position adjusting method. A device for such an adjustment method is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-145624. This technique detects the above-described displacement by a single output inspection from a line sensor, and uses a chart in which a black pattern and a white pattern are combined.
[0005]
[Problems to be solved by the invention]
However, the above method can detect the central portion viewed by the line sensor, but cannot easily detect other regions. If the detection range of the line sensor cannot be accurately grasped, harmful light may be incident on the light receiving surface, causing unexpected distance measurement. In addition, when applied to a camera or the like, it is impossible to determine which part of the finder can measure the distance.
[0006]
The present invention has been made in view of the above-described problems, and an object of the present invention is to accurately detect a distance measurement range of a passive distance measuring device, and to measure a finder without measuring an unnecessary area. In order to accurately measure the distance of an object when it is applied for focusing on a camera or video.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a distance measuring position adjusting apparatus according to the first aspect of the present invention has a sensor array that looks at an object from a different field of view with a predetermined parallax and measures its luminance distribution. A distance measuring device that measures the distance to the object based on the difference in luminance distribution of the object, a first reflectance plane chart disposed in front of the distance measuring apparatus, and the plane chart Disposed on the front surface in the direction of the parallax, having a second reflectance different from the first reflectance, and with respect to the two directions of the parallax direction and the direction connecting the device and the chart And at least two movable members that are movable in directions orthogonal to each other, and measuring a range-finding effective range of the rangefinder.
[0008]
Further, the distance measuring position adjustment device according to the second aspect has a sensor array that measures the luminance distribution by looking at the object from different fields of view with a predetermined parallax, and the difference in the luminance distribution of the object due to the parallax. A distance measuring device that measures the distance to the object based on the first reflectance plane disposed in front of the distance measuring device and spaced apart in the parallax direction; And a measurement chart having at least two patterns having a second reflectance different from the first reflectance, extended in a direction orthogonal to two directions, i.e., a direction connecting the apparatus and the chart. And measuring the effective range of the distance measuring device.
[0009]
In addition, the distance measuring position adjustment device according to the third aspect has a sensor array for measuring an object's luminance distribution by looking at the object from different fields of view with a predetermined parallax, and the difference in the luminance distribution of the object due to the parallax. And a finder for observing the subject from a different field of view than the distance measuring device. And above On the first reflectance plane disposed in front of the distance measuring device, it is arranged spaced apart in the direction of the parallax and orthogonal to the two directions of the parallax direction and the direction connecting the device and the chart. A measurement chart having at least two patterns having a second reflectance different from the first reflectance, extended in the direction of A display unit for displaying an index for observation with the finder; And measuring the effective range of the distance measuring device.
[0010]
That is, in the ranging position adjusting apparatus according to the first aspect of the present invention, the first reflectance flat chart is disposed in front of the ranging apparatus, and is spaced apart in the parallax direction from the front of the planar chart. And having a second reflectance different from the first reflectance, and movable in a direction perpendicular to two directions of the parallax direction and the direction connecting the device and the chart. A movable member is provided, and these measure the effective range of the distance measuring device.
[0011]
Further, in the ranging position adjusting device according to the second aspect, the parallax direction is arranged on the first reflectance plane disposed in front of the ranging device so as to be separated from the parallax direction. The distance measurement using a measurement chart having at least two patterns having a second reflectance different from the first reflectance, extended in a direction perpendicular to two directions connecting the device and the chart. The effective range of the device is measured.
[0012]
In the distance measuring position adjustment device according to the third aspect, the subject is observed from a different field of view than the distance measuring device through the viewfinder. The measurement chart is on On the first reflectance plane disposed in front of the distance measuring device, it is arranged spaced apart in the direction of the parallax and orthogonal to the two directions of the parallax direction and the direction connecting the device and the chart. And at least two patterns having a second reflectance different from the first reflectance. Then, the indicator for observing with the finder is displayed on the display unit, A range-finding effective range of the rangefinder is measured.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 4 shows an outline of a passive distance measuring device employed by the present invention.
In the figure, the light receiving lenses 1a and 1b are arranged apart from each other by a distance B between the principal points, and these have a parallax and are used to detect light incident from the detection area 7 and distribution of the light respectively. It leads to the luminance distribution detection sensor arrays 2a and 2b.
[0014]
As shown in FIG. 4B, the light receiving lenses 1a and 1b and the sensors 2a and 2b which are these optical systems include a light shielding box 8 so that noise light from other than the object 13 does not enter the sensors 2a and 2b. It is housed inside and integrated. The detection area 7 has errors due to the quality of manufacturing, variations, and errors during bonding of the light shielding box 8, the sensor arrays 2a and 2b, and the lenses 1a and 1b. Therefore, it is necessary to take a means for recognizing the error in the detection area 7.
[0015]
Therefore, in the present invention, as shown in FIG. 1, the planar chart 20 having a predetermined reflectance placed in front of the distance measuring device and the front surface of the chart 20 are arranged apart from each other in the parallax direction. For adjustment, the two movable members 23a and 23b having a second reflectance different from the reflectance of the movable member 23a and 23b can be moved in a direction orthogonal to two directions of the parallax direction and the direction connecting the device and the chart 20. The error of the detection area 7 is accurately measured using the chart 21.
[0016]
The relative position difference x of the light distribution incident on the sensor arrays 2a and 2b changes depending on the subject distance L due to the difference B (base line length) between the positions of the light receiving lenses 1a and 1b. When the focal length of each of the light receiving lenses 1a and 1b is f, the subject distance L is
L = B × f / x (1)
As required. Each sensor in the sensor arrays 2a and 2b outputs a current signal according to the amount of incident light. Therefore, if these signals are converted into digital signals by the A / D converters 3a and 3b, a digital signal generated by the image shift amount calculator is obtained. The above x can be detected by a well-known correlation calculation. This result is input to a calculation control means (CPU) 10 comprising a one-chip microcomputer or the like, and the distance L is obtained by calculating the above equation (1).
[0017]
This is the basic principle and general configuration of the passive triangulation system. The deviation amount detection function may be housed in the unit, or may be incorporated in the CPU 10. When focusing the camera with this technology, the CPU 10 controls the camera's focusing lens with an automatic focus adjustment (AF) function if it controls the camera's focusing lens via an actuator such as a motor. A camera is provided. The memory 6 is a correction coefficient in consideration of the quality of parts in the camera production process in order to correct a distance measurement error caused by a difference in objects to be measured and to correct variations in sensitivity of each sensor array. Remember.
[0018]
The appearance of such a camera is shown in FIG.
In the figure, a camera body 9 is provided with a photographing lens 12 and a viewfinder objective lens 11 at predetermined positions, and further, two light receiving lenses 1a and 1b of the distance measuring device are arranged and integrated. It is configured. When looking through the viewfinder, a screen 15 as shown in FIG. 6 is seen. A so-called range-finding frame 14 indicating a range-finding range is displayed at the center of the screen 15. If the subject 13 to be focused is placed here, focusing is performed according to the above principle based on the luminance distribution of the subject 13.
[0019]
However, as shown in FIG. 5, there is a positional difference between the finder 11 and the distance measuring lenses 1a and 1b, and there is an error in the distance measuring area 7 described above. Therefore, as shown in FIG. 7, the subject 13 viewed by the photographer 16 through the viewfinder lens systems 11, 11a, and 11b and the points measured by the distance measuring unit 8 are adjusted by the unit 8 when the camera is assembled. It is necessary to fit together.
[0020]
This also requires accurate grasping of the ranging area 7, and in the present invention, when the arrangement direction of the sensor arrays 2a and 2b is the first direction, it is placed in the second direction in front of the ranging apparatus. The target mark for observing with the finder is displayed on the plane having the predetermined reflectivity, and is spaced apart in the first direction, and is directed from the different direction of the chart toward the center of the chart. Using a measurement chart comprising two patterns having a second reflectance different from the reflectance, extending in a third direction orthogonal to the first and second directions. By adopting the position adjustment method of the distance measuring device in the camera, it is possible to take a photograph in focus at a position desired by the photographer.
[0021]
Hereinafter, with reference to FIG. 2, a chart used for distance measurement position adjustment will be described. The flat chart has a predetermined uniform reflectance (for example, 18% gray). When this is viewed in the sensor array of the distance measuring device, the output of each sensor is the same. Two bars 24a and 24b are lowered in front of this plane, and pipe-like members 23a and 23b having a reflectance different from the chart (for example, 40% white) are arranged along the bars so as to be movable up and down. To do. These two bars are respectively attached to members 22a and 22b that are movable in the base line length direction along the frame 21, and the length direction of the bars is determined as shown in FIG. 2 (a). It is orthogonal to the longitudinal direction (baseline length direction) of the region 7.
[0022]
Further, if the reflectance of the bar is lower than that of the flat chart 20 (for example, black), even if this is out of the detection area, as in the white pipe on the left side shown in FIG. Since the local minimum value is output from the luminance difference, the detection area in the longitudinal direction (lateral direction in the figure) of the sensor array can be easily monitored. Needless to say, the bar is not necessarily black although it has such an effect.
[0023]
When measuring the chart of such a configuration and looking at each data of the sensor array of the distance measuring device, the output which was equal when only looking at the plane chart is due to the pipes 23a and 23b and the bars 24a and 24b entering the field of view. As shown in FIG. 2A, when the white pipes 23a and 23b enter the visual field 7, the position of each sensor is plotted on the horizontal axis and the output of each sensor is Taking the axis, an output waveform as shown in FIG. 2B is obtained from each sensor array. That is, since many photocurrents are output from the sensors looking at the white pipes 23a and 23b, the output becomes maximum at the position of the sensors.
[0024]
Thus, if two local maximum values appear, it is clear that this is the distance measurement area, so that the pipes 23a and 23b are displaced from the detection area 7 in the lateral direction, as shown in FIG. 2 (g). In such a case, since the sensor at the predetermined position does not take a peak, the deviation amount can be known.
[0025]
However, in this embodiment, the detection area in the vertical direction, which is orthogonal to the direction in which the sensor arrays are arranged, cannot be grasped only by this. Therefore, the pipes 23a and 23b are moved up and down as shown in FIGS. 2 (c) and 2 (e). In the case of FIG. 2C, since the left pipe 23a is disengaged from the detection area 7 and the right pipe 23b is intruded, the output of the sensor array is shown in FIG. It can be seen that 2 (d) is obtained.
[0026]
Similarly, in the case of FIG. 2 (e), as shown in FIG. 2 (f), the sensor output on the right side where the white pipe 23b has entered shows the maximum value, and the left side where the black bar 24a is in the detection area. The sensor output shows a minimum value because the amount of incident light is small. Based on the maximum and minimum of the sensor output, the vertical range of the ranging area 7 can be known.
[0027]
Thus, since the detection area of the sensor can be accurately grasped in the vertical and horizontal directions, the gray chart 20 is removed and the mannequin 26 is disposed between the pipes as shown in FIG. As shown in 2 (j), a sensor output based on the background of the mannequin 26 is obtained.
[0028]
According to this output, distance measurement is performed with the configuration shown in FIG. 4, and the correction coefficient is written in the memory 6 so that the result is calculated as the distance to the actual mannequin 26. Can be accurately measured. Alternatively, a chart with uniform luminance may be arranged instead of the mannequin 26, and the correction coefficient may be stored so that the sensor outputs between the sensors indicating the extreme values on the left and right at that time are constant. As a result, it is not necessary to manage the luminance distribution in a range more than necessary, and the production and adjustment processes can be simplified and space can be saved.
[0029]
Hereinafter, the above steps will be described more specifically with reference to the flowchart of FIG.
The distance measuring unit is fixed at a predetermined position away from the chart in the direction in which the chart as shown in FIG. 1 can be measured (step S1), and the right bar 24b is moved in the horizontal direction, that is, in the x direction. The distance sensor output monitoring is repeated (steps S2 and S3). The position of the bar 24b can be detected by the peak position of the sensor output as described above. Thereby, when the rod 24b is located at the right end of the sensor detection range, the process branches from step S3 to step S4. Similarly, after the left end of the sensor detection range is detected by the movement of the left end rod 24a, the process branches to step S6 (steps S4 and S5). Subsequently, the two white pipes 23a, 23b are moved up and down (step S6), and it is detected whether the output peaks are the same on the left and right as shown in FIG. 2B. If they become the same, the process proceeds to step S8. (Step S7). If the left and right pipes 23a and 23b are moved up and down in conjunction with each other and the lower end of 23a coincides with the upper end of 23b, the center in the vertical direction of the sensor can be determined by this method.
[0030]
Thus, the width Δx of the left and right detection areas is obtained from the distance between the two bars, and the center in the vertical direction is obtained from the position of the pipe. The width of the upper and lower detection areas may be calculated from the above Δx. The aspect ratio α of the sensor array is suppressed by design.
[0031]
The range thus obtained is uniformly illuminated (step S8), and a correction value is obtained so that the sensor outputs at this time are the same, and written in the memory 6. The distance measuring device calculates the distance with reference to the correction value every time the distance is measured (step S9).
[0032]
As described above, according to the first embodiment, the position adjustment of the passive AF type distance measuring unit can be performed accurately.
Next, FIG. 8A shows a second embodiment of the present invention in which the camera finder already described in FIG.
[0033]
In the figure, in the gray chart 20 arranged in front of the camera, two white lines 31a and 31b are vertically arranged at a predetermined interval. This has the same function as the white pipes 23a and 23b in FIG.
[0034]
Further, the chart 20 is provided with an index 30 for confirming the center of the finder when looking through the finder. In the camera production process, the operator 35 first looks into the finder to check the index 30 and fixes the camera 9 so that it is at the center of the finder. Thereafter, the distance measuring unit 8 is moved to adjust the position so that the center of the finder can be correctly measured. The interface 33 is a circuit for reading out the sensor output during distance measurement from the CPU of the camera. The personal computer 34 is placed in the adjustment process of the camera, and the unit 8 is automatically adjusted via the adjustment mechanism 32 based on the above-mentioned concept from the obtained sensor data, and the camera 31 is controlled by controlling the device 31 for automatically applying the adhesive. Glue and fix the unit to.
[0035]
Here, as shown in FIG. 8B, the distance measuring unit 8 is disposed in the camera body 9 so that the position thereof can be easily adjusted, and is housed in a member 40 that can rotate around a fulcrum 42. . Further, as the feed screw 41 rotates, it can move up and down along the rail 44. With this mechanism, the position adjustment of the distance measuring unit 8 that can adjust the field of view vertically and horizontally is performed on the same principle as described above with reference to FIG. That is, the visual field is rotated left and right according to the peak position of the sensor array, and the visual field is moved up and down by comparing the heights of the left and right peaks of the sensor array output.
[0036]
Specifically, as shown in FIG. 2 (d), if the right peak is high, it is assumed that many white patterns extending from the bottom are included in the field of view as shown in FIG. 2 (c). Move up. If the left peak is high as shown in FIG. 2 (f), it is considered that many white patterns extending from the top are in the field of view as shown in FIG. 2 (e). Turn the screw to shift the field of view downward.
[0037]
With such a configuration and action, it is possible to provide an AF camera that can correctly focus on the subject as aimed by the camera finder.
As described above, according to the second embodiment, the same effect as that of the first embodiment described above can be obtained using a more simplified chart.
[0038]
Next, FIG. 9 shows and describes the configuration of a camera according to the third embodiment.
In the configuration as shown in FIG. 8B, since the adjustment mechanism is provided in the camera, the size of the camera increases. Therefore, in the third embodiment, an adjustment method is adopted in which the distance measuring unit 8 is once assembled to the camera body 9 to measure the distance of the chart 20, and the Kansa is determined from the sensor output at that time.
[0039]
The chart 20 used in the third embodiment is a uniform reflectivity chart provided with three white patterns from the top and bottom, so that the unit tilt error in the vertical direction can be obtained by reading sensor data once. Can be calculated. Further, the camera fixing base 50 can be rotated up and down and left and right by motors 52 and 53, the inside of the finder 11 is observed by the CCD camera 51, the index 30 at the center of the chart 20 is confirmed, and as a result, the personal computer 34 If the drivers 54 of the motors 52 and 53 are controlled to rotate, the center position of the viewfinder can be automatically adjusted.
[0040]
If the personal computer 34 reads out each sensor output of the sensor array via the interface circuit 33 in the central position state, the vertical position error of the sensor detection range is obtained according to the principle shown in FIG. be able to.
[0041]
FIG. 10A shows a case where the distance measurement unit 7 is positioned at the center of the chart 20 according to the quality design of the distance measurement unit 8. In the same figure, the chart 20 includes a total of six lines, three in pairs from above and below as described above. The two lines located at the center of the left and right extend from the top and bottom, and the top and bottom direction also match at the center. However, the left and right lines match the line from the top and bottom at a position shifted by E in the top and bottom direction as shown in the figure. . Since the sensors constituting the sensor array are arranged in the horizontal direction of the distance measuring area 7 as in FIG. 2A, the output of the sensors includes more white lines in the vertical direction. Output current.
[0042]
Therefore, when the sensor position is taken on the horizontal axis and the sensor output is taken on the vertical axis, a symmetrical graph as shown in FIG. 10C is obtained. At the center, white lines coming from the top and bottom are included in the vertical direction by the same area, so the sensors looking at the lines 103 and 104 output the same signal amounts P3 and P4 (P3 = P4).
[0043]
However, the sensor output for viewing the left line pair 101, 102 has a large proportion of the two lines in the distance measurement area 7, so the output is unbalanced and P1 <P2. At this time, assuming that the vertical width of the sensor detection area on the chart is Y, the following relationship is taken together with the aforementioned deviations E, P3, and P4.
[0044]
P1 = (Y / 2−E) × (P3 + P4) / Y (2)
As shown in FIG. 11, Y is determined by the focal length F of the light receiving lens 1a, the height y0 of the sensor array 2a, and the distance L to the chart, and is expressed by the following equation.
[0045]
Y = y0 × L / F (3)
As is apparent from this figure, if the sensor array 2a is displaced by dy due to an error in assembling the distance measuring unit, the directivity becomes an error of θ, and on the chart placed at the distance L. Then, it appears as a position error DY in the detection area.
[0046]
θ = arctan (DY / L) = arctan (dy / F) (4)
When a distance measuring unit having such an error is assembled to the camera, the distance from the design target is measured, and the target object cannot be focused. Therefore, a Kansa 70 that corrects the direction error θ is sandwiched and bonded between the camera body 9a and the unit 8 as shown in FIG. However, since [theta] varies depending on the quality of the parts, several types of Kansa are prepared and selected by calculating the correction coefficient in this embodiment.
[0047]
Now, as to how to obtain this θ, when the distance measuring unit is assembled to the camera body without a kan and the distance measuring unit looks at the chart 20 with an error of DY as shown in FIG. Obtained from the sensor data (see FIG. 10D). Unlike the cases shown in FIGS. 10A and 10C, the sensor data is shifted by DY from the contact point of the pattern pair consisting of the white patterns 103 and 104 at the center. Produces a difference as shown in FIG. When the sensor outputs P3 and P4 are simplified for explanation and calculated from the area ratio included in the field of view of the sensor array,
P3 = (Y / 2 + DY) × (P1 + P2) / Y (5)
P4 = (Y / 2−DY) × (P1 + P2) / Y (6)
It becomes.
[0048]
Therefore,
DY = (Y × P3-P4) / (P3 + P4)) / 2 (7)
From this DY, Kan's θ is determined using equation (4).
[0049]
The above is the basic formula of the present embodiment, and the error in the vertical visual field is corrected by the thus determined Kanza. Further, the error in the left-right direction is determined by checking the position of the sensor output peak based on the patterns 103 and 104 located at the center of the screen, and writing it in the memory on the camera production process so that the sensor corresponding to this position is the center sensor. At the time of shooting, focusing may be performed with reference to this result.
[0050]
Such an adjustment process is represented by a flowchart as shown in FIG.
That is, the above operations will be described together. First, the distance measurement unit is temporarily assembled (step S11), the camera is scanned according to the output of the CCD camera 51 (step S12), and whether or not there is an index at the center of the screen is determined. Determination is made (step S13). Here, if there is no index at the center of the screen, the process returns to step S12. If there is, the AF sensor data is read (step S14), and after determining the Kansa from the error related to the data (step S15). Then, the AF unit is removed and fixed by sandwiching the Kanza (step S16), the center sensor is written in the memory (step S17), and the operation is terminated.
[0051]
Incidentally, an error may occur in the width Y of the field of view of the sensor due to the focal length F of the light receiving lens 1a and the mounting error in the focal length direction of the sensor array 2a.
Although this Y error has been omitted in the above description, the equation (2) is actually used to examine this Y error. If this is transformed,
Y = E / (0.5− (P1 / (P3 + P4))) (8)
Thus, the actual visual field width is obtained from the constant E determined by the chart.
[0052]
If the equation (7) is calculated based on Y thus obtained, more accurate visual field adjustment can be performed.
As described above, according to the third embodiment, it is possible to provide a small camera that can accurately focus on what the user has aimed for. In addition, by devising the chart pattern, the visual field error can be accurately calculated without repeatedly measuring the distance.
[0053]
Further, the sensor visual field may be tilted due to a sensor attachment error to the distance measuring unit, but the tilt φ can be calculated by applying the present embodiment.
For example, as shown in FIG. 13A, a chart 20 is used in which two white patterns from the top and bottom touch each other at the center in the vertical direction of the chart.
[0054]
On the other hand, when sensor data is read using a tilted sensor, the data has a bilaterally asymmetric peak as shown in FIG. 13B, and if the sensor is not tilted, a bilaterally symmetrical peak graph is obtained. . Using this principle, the distance measurement unit may be adjusted in the φ direction so that it is symmetrical, and the area of the white pattern included in the field of view can be calculated according to the above formula to correct these φ errors. You may make it arrange | position the Kansa to do.
[0055]
In addition, according to the said embodiment of this invention, the following invention is also included.
(1) A sensor array that is arranged in a first direction, looks at an object from different fields of view with a predetermined parallax, and measures its luminance distribution, and according to the difference in the luminance distribution of the object due to the parallax, A distance measuring device that measures the effective range of a distance measuring device that measures the distance to the object,
A fanida for observing an object from a different field of view from the distance measuring device,
On the plane of the predetermined reflectivity placed in the second direction that is the front of the distance measuring device, and spaced apart in the first direction, from the different direction of the chart toward the center of the chart, On the same plane as the first pattern pair consisting of two patterns having a second reflectance different from the reflectance, extending in a third direction orthogonal to the two directions of the first and second directions The first pattern pair is disposed at a position distant from the first and third directions, is spaced apart from the first direction, and is directed from a different direction of the chart toward the center of the chart. A second pattern pair consisting of two patterns having a second reflectance different from the reflectance of the chart, extending in a third direction orthogonal to the two directions of the first and second directions. A measurement chart having Position adjusting device of the measuring device to be.
[0056]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately grasp the range that can be measured by the passive distance measuring device. It is possible to provide a method for adjusting a distance measuring apparatus that can accurately measure a target object without erroneous distance measurement due to parallax or the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a chart used in an adjustment method for a distance measuring apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a chart state and a corresponding sensor output of an adjustment method of the distance measuring apparatus according to the first embodiment.
FIG. 3 is a flowchart for explaining an adjustment method of the distance measuring apparatus according to the first embodiment;
FIG. 4 is a diagram showing an outline of a passive distance measuring device employed by the present invention.
FIG. 5 is an external view of a camera employing a passive distance measuring device.
6 is a view showing a finder display of the camera of FIG. 5. FIG.
FIG. 7 is a diagram for explaining parallax between a finder optical system and a ranging optical system of a passive camera.
FIG. 8 is a diagram for explaining a second embodiment;
FIG. 9 is a diagram illustrating a configuration of a camera according to a third embodiment.
FIG. 10 is a diagram showing a relationship between a chart and a corresponding sensor output in the third embodiment.
FIG. 11 is a diagram illustrating a state in which a vertical width Y on a chart of a sensor detection area is calculated in the third embodiment.
FIG. 12 is a diagram for explaining an arrangement of a Kanza 70 for correcting a direction error θ in the third embodiment.
FIG. 13 is a diagram for explaining a case where a slope φ is calculated by application of the third embodiment.
FIG. 14 is a flowchart showing an adjustment method of the distance measuring apparatus according to the third embodiment.
[Explanation of symbols]
20 Plane chart
21 Adjustment chart
22 Movable members
23 Movable members
24 sticks

Claims (3)

A distance measuring device that has a sensor array for measuring an object's luminance distribution from a different field of view with a predetermined parallax, and that measures the distance to the object based on the difference in the luminance distribution of the object due to the parallax. When,
A plane chart of the first reflectance disposed in front of the distance measuring device;
The second chart has a second reflectance different from the first reflectance, and is arranged in front of the planar chart in the direction of the parallax, and has two parallax directions and a direction connecting the chart with the device. At least two movable members movable in a direction perpendicular to the direction;
And a ranging position adjusting device for measuring an effective range of the ranging device. A distance measuring device that has a sensor array for measuring an object's luminance distribution from a different field of view with a predetermined parallax, and that measures the distance to the object based on the difference in the luminance distribution of the object due to the parallax. When,
On the first reflectivity plane disposed in front of the distance measuring device, it is spaced apart in the parallax direction and orthogonal to the two directions of the parallax direction and the direction connecting the device and the chart. A measurement chart having at least two patterns having a second reflectance different from the first reflectance, extended in the direction of
And a ranging position adjusting device for measuring an effective range of the ranging device. A distance measuring device that has a sensor array for measuring an object's luminance distribution from a different field of view with a predetermined parallax, and that measures the distance to the object based on the difference in the luminance distribution of the object due to the parallax. When,
A viewfinder for observing a subject from a different field of view from the distance measuring device ,
A first reflectivity on a plane disposed in front of the upper Symbol distance measuring device, are spaced apart in the direction of the disparity with respect to two directions of a direction connecting direction and the device and chart of the parallax A measurement chart having at least two patterns extending in an orthogonal direction and having a second reflectance different from the first reflectance, and a display unit for displaying an index for observation with the finder,
And a distance measuring position adjusting device for a camera, characterized by measuring an effective distance measuring range of the distance measuring device.

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