JP2000089091A - Focus detector, range-finding device, and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make precisely detectable focal information at a high speed as a focus detector having many focus detection areas. SOLUTION: This focus detector is provided with plural focus detection areas within a screen and equipped with an arithmetic means executing a focus detecting action based on outputs obtained in the plural focus detection areas. By the arithmetic means, the plural focus detection areas are divided into plural groups and the order of priority for arithmetic operation is given to the respective groups. Then the arithmetic operation and the evaluation thereof are executed in turn from the group having the high order of priority. However, when a prescribed evaluation value is satisfied as the result of the evaluation, the arithmetic operation is finished at that time (#217→#218→#221→#222).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus detecting device having a plurality of focus detecting areas, a distance measuring device having a plurality of distance measuring areas, and a camera having the focus detecting device or the distance measuring device. The present invention relates to improvement of optical equipment.

[0002]

2. Description of the Related Art Conventionally, as an automatic focus detection device of a camera, a light beam from a subject passing through different exit pupil regions of a photographing lens is combined on a pair of line sensors, and the subject image is obtained by photoelectric conversion. There is widely known an automatic focus adjustment method of detecting a defocus amount of a subject by calculating a relative positional displacement amount of a pair of image signals and driving a photographing lens based on the detected defocus amount.

As shown in FIG. 2, many single-lens reflex cameras in recent years arrange a plurality of focus detection areas in a photographing screen and automatically select a focus detection area according to various subjects and situations. When an operator selects an arbitrary focus detection area, a focus detection operation is performed in the selected focus detection area.

Further, with the recent improvement in semiconductor manufacturing technology, the number of focus detection areas tends to increase as shown in FIG.

[0005]

When there are a plurality of focus detection areas, a defocus amount is obtained for each focus detection area. Up to now, as a method of automatically selecting a plurality of focus detection areas, defocus amounts of all focus detection areas are obtained, the detection results are compared, and it is determined that the focus detection areas correspond to the main subject position in the screen. Determine the most suitable focus detection area as the final focus detection area,
The defocus amount obtained in that region was used as the defocus amount used for focus adjustment.

However, as described above, the defocus amount is to calculate the relative positional displacement amount of a pair of image signals, and this is determined by an MPU (micro processing unit).
Is calculated by the following arithmetic processing.

As is well known, the focus detection operation in a plurality of focus detection areas fluctuates depending on the brightness of the subject and the direction of light rays, and it is rare for the focus detection areas to end simultaneously in all focus detection areas. In general, the calculation processing of the MPU is a sequential processing, and a super multi-point automatic focus detection camera having as many as 45 focus detection areas as shown in FIG. 3 requires a huge amount of calculation to obtain all defocus amounts. Processing time was long and not practical.

To solve this problem, Japanese Patent Application Laid-Open No. 5-45576 discloses
When the first defocus amount among the defocus amounts detected in each focus detection area satisfies a predetermined criterion, it is independent of the defocus amounts in other focus detection areas. By determining that the main subject is located in the focus detection area where the defocus amount is obtained, and selecting the earliest defocus amount obtained for the focus adjustment, quick focus detection is performed. A method for enabling operation is disclosed.

Although this concept certainly enables high-speed focus detection, even if the defocus amount in a certain focus detection area satisfies a predetermined criterion during focus detection, the remaining focus detection can be performed. There is always a possibility that a focus detection area suitable for judging that the area corresponds to the main subject position remains. This is more conspicuous as one having a larger number of focus detection areas as shown in FIG.

(Object of the Invention) A first object of the present invention is to provide a focus detection device and an optical apparatus which can detect high-speed and accurate focus information even in a case having a large number of focus detection areas. It is assumed that.

A second object of the present invention is to provide a distance measuring device and an optical apparatus which can detect high-speed and accurate distance measuring information even in a device having a large number of distance measuring areas. is there.

[0012]

In order to achieve the first object, the present invention according to claims 1 and 7 has a plurality of focus detection areas in a screen, and includes a plurality of focus detection areas. In a focus detection device having calculation means for performing a focus detection operation based on the obtained output, the calculation means divides the plurality of focus detection areas into a plurality of groups, and assigns a priority of the calculation processing to each of the groups. Calculation processing and evaluation are performed in order from the group with the highest priority. As a result of the evaluation, if there is a group that satisfies a predetermined evaluation value, a focus detection device that terminates the calculation processing at that time. Is what you do.

The above configuration is applied to, for example, a focus detection device of a camera, so that movement of a subject is not considered.
In SHOT-AF, by effectively dividing multiple focus detection areas in the screen into multiple groups, it is not always necessary to perform focus detection in all focus detection areas, and the results of evaluation in the middle will satisfy the photographer A focus detection result can be obtained, which is particularly suitable for focus detection of a still subject such as a landscape.

[0014] Similarly, in order to achieve the first object,
The present invention according to claims 2 and 7, wherein the focus detection device has a plurality of focus detection areas in a screen, and has a calculation means for performing a focus detection operation based on outputs obtained in the plurality of focus detection areas, The arithmetic unit divides the plurality of focus detection areas into a plurality of groups, assigns a priority to the arithmetic processing to each of the groups, and performs the arithmetic processing and the evaluation thereof in order from the group having the highest priority. As a result of the evaluation, if there is a group that satisfies a predetermined evaluation value, the focus detection areas belonging to the group are newly grouped around a focus evaluation area having a high evaluation. As a result of performing the calculation processing and the reliability evaluation thereof, if any of the evaluations satisfies the evaluation, the focus detection apparatus terminates the calculation processing at that time.

By applying the above configuration to, for example, a focus detection device of a camera, the movement of a subject is not considered.
In SHOT-AF, the focus detection area in the screen is divided into multiple groups and evaluated in order of priority, and if there is a group that satisfies a predetermined evaluation value, the focus is on a specific focus detection area of that group New grouping is performed, and if this new group is satisfied, the arithmetic processing is terminated at that point, so that the evaluation in the middle without necessarily performing focus detection in all focus detection areas is performed. According to the result, a focus detection result satisfactory by the photographer can be obtained, which is particularly suitable for focus detection of a stationary subject such as portrait photography.

Similarly, in order to achieve the first object,
8. A focus detecting apparatus according to claim 3, further comprising a plurality of focus detecting areas in a screen, and a calculating means for performing a focus detecting operation based on outputs obtained from the plurality of focus detecting areas. In the focus detection, the arithmetic means performs arithmetic processing and evaluation on a final focus detection area selected in the past, and terminates the arithmetic processing at that time if the evaluation result satisfies a certain evaluation value. Device.

By applying the above configuration to, for example, a focus detection device of a camera, an AI SE in consideration of the movement of a subject can be obtained.
In RVO-AF, when the photographer follows a moving subject on the screen, paying attention to the fact that the focus detection area once selected is likely to be selected again, evaluation is performed using the focus detection area once selected. If satisfied, the focus detection is terminated with this, but if not satisfied, a plurality of focus detection areas are dynamically divided into a plurality of groups based on the once selected focus detection area and evaluated in priority order, If there is a group that satisfies the predetermined evaluation value, the calculation processing is terminated at that point, so that focus detection may not necessarily be performed in all focus detection areas, and depending on the evaluation result in the middle, satisfaction of the photographer may be satisfied. This is suitable for detecting the focus of a moving subject such as a motorsport, which can provide several focus detection results.

Similarly, in order to achieve the first object,
The present invention according to claims 5 and 7, wherein the focus detection device has a plurality of focus detection areas in a screen, and has a calculation means for performing a focus detection operation based on outputs obtained in the plurality of focus detection areas, The calculating means divides the plurality of focus detection areas into a group including a final focus detection area selected in the past and a plurality of groups different from the group, and performs arithmetic processing on each of these groups. Priorities are assigned, and arithmetic processing and its reliability evaluation are performed in order from the group with the highest priority. If there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the arithmetic processing ends at that point. It is a focus detection device.

By applying the above configuration to, for example, a focus detection device of a camera, an AI SE in consideration of the movement of a subject can be obtained.
In RVO-AF, when the photographer follows a moving subject on the screen, it is noted that the focus detection area once selected is easily selected again, and multiple focus detection is performed based on the focus detection area selected once. The region is dynamically divided into a plurality of groups and evaluated in order of priority, and if there is a group that satisfies a predetermined evaluation value, the arithmetic processing is terminated at that point, so that not all focus detection regions are necessarily used. Even if focus detection is not performed, depending on the evaluation result in the middle, a satisfactory focus detection result of the photographer can be obtained, which is suitable for focus detection of a moving subject such as motor sports.

Similarly, in order to achieve the first object,
The present invention according to Claims 6 and 7, wherein the focus detection device has a plurality of focus detection areas in a screen, and has a calculation means for performing a focus detection operation based on outputs obtained in the plurality of focus detection areas, The calculating means divides the plurality of focus detection areas into a group including a final focus detection area selected in the past and a plurality of groups different from the group, and performs arithmetic processing on each of these groups. The priorities are assigned, and the arithmetic processing and the evaluation are performed in order from the group having the highest priority. If there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the focus detection area belonging to the group is further determined. Of the focus detection areas having a high evaluation among them, the grouping is newly performed, and the calculation processing of the new group and the evaluation thereof are performed. If there is a satisfaction is for focus detection device for terminating processing at that point.

By applying the above configuration to, for example, a camera focus detection device, an AI SE
In RVO-AF, not only the focus detection area selected once, but also a plurality of focus detection areas divided into a plurality of groups based on this focus detection area are evaluated at the same time. Exists, a new grouping is performed centering on a specific focus detection area of the group, and if the new group is satisfied, the arithmetic processing is terminated at that time. Therefore, a focus detection result satisfying the photographer can be obtained depending on the evaluation result in the middle without necessarily performing focus detection in all focus detection areas. , Which is suitable for focus detection of a scene such as a soccer game.

In order to achieve the second object,
The present invention according to claims 8 and 14, wherein the distance measuring apparatus has a plurality of distance measuring areas in a screen, and has a calculating means for performing a distance measuring operation based on an output obtained in the plurality of distance measuring areas,
The calculation means divides the plurality of distance measurement areas into a plurality of groups, assigns a priority to the calculation processing to each of the groups, and performs the calculation processing and the evaluation thereof in order from the group having the highest priority. If there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the distance measuring apparatus terminates the arithmetic processing at that time.

Similarly, in order to achieve the second object,
The present invention according to claim 9 and claim 14, is a distance measuring apparatus having a plurality of distance measuring areas in a screen, and a calculating means for performing a distance measuring operation based on the output obtained in the plurality of distance measuring areas,
The calculation means divides the plurality of distance measurement areas into a plurality of groups, assigns a priority to the calculation processing to each of the groups, and performs the calculation processing and the evaluation thereof in order from the group having the highest priority. As a result of the evaluation, if there is a group that satisfies a predetermined evaluation value, a new group is further formed around the highly evaluated ranging areas among the ranging areas belonging to the group. As a result of performing the calculation processing and its reliability evaluation, if any of the evaluations satisfies the evaluation, the distance measuring apparatus ends the calculation processing at that time.

Similarly, in order to achieve the second object,
15. The distance measuring apparatus according to claim 10, further comprising a plurality of distance measuring areas in a screen, and a calculating means for performing a distance measuring operation based on outputs obtained in the plurality of distance measuring areas. In the above, the calculating means performs a calculating process and a reliability evaluation of the final ranging area selected in the past,
If the evaluation result satisfies a certain evaluation value, the distance measuring apparatus terminates the arithmetic processing at that time.

Similarly, in order to achieve the second object,
The present invention according to claim 12 and claim 14, is a distance measuring apparatus having a plurality of distance measuring areas in a screen, and a calculating means for performing a distance measuring operation based on the output obtained in the plurality of distance measuring areas, The calculating means divides into a group including a final ranging area selected in the past and a plurality of groups different from the group, assigns a priority to the arithmetic processing to each of these groups, and assigns a priority to the priority. The arithmetic processing and its evaluation are performed in order from the highest group. If there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the distance measuring apparatus ends the arithmetic processing at that time.

Similarly, in order to achieve the second object,
The present invention according to claims 13 and 14, wherein the distance measuring apparatus has a plurality of distance measuring areas in a screen, and has a calculating means for performing a distance measuring operation based on the output obtained in the plurality of distance measuring areas, The calculating means divides into a group including a final ranging area selected in the past and a plurality of groups different from the group, assigns a priority to the arithmetic processing to each of these groups, and assigns a priority to the priority. The arithmetic processing and its evaluation are performed in order from the highest group. If the result of the evaluation shows that there is a group that satisfies the first evaluation value, the measurement area having a higher evaluation among the ranging areas belonging to the group is further evaluated. Newly grouped around the distance area, and as a result of performing the arithmetic processing of the new group and evaluating its reliability, if any of the evaluations is satisfactory, the arithmetic processing is terminated at that point. In order to achieve the first object, the present invention according to claim 15 includes a focus detecting device according to any one of claims 1 to 7. Optical equipment.

In order to achieve the second object,
According to a sixteenth aspect of the present invention, there is provided an optical apparatus including any one of the distance measuring devices according to the eighth to fourteenth aspects.

In order to achieve the first object,
The present invention according to claims 17, 19 to 21, is a focus detection device having a plurality of focus detection areas in a screen, wherein focus detection calculation is performed on N areas among the plurality of focus detection areas, When the focus detection results in the N areas satisfy predetermined evaluation conditions, a focus state is determined based on the focus detection results in the N areas, and the focus detection in the N areas is performed. When the result does not satisfy the predetermined evaluation condition, the focus detection apparatus is configured to perform focus detection calculation on M areas other than the N areas.

Similarly, in order to achieve the first object,
The present invention according to claims 18 to 21 and 26, in a focus detection device having a plurality of focus detection areas in a screen, performs a focus detection calculation on N of the plurality of focus detection areas, A predetermined area in the N areas is selected based on a focus detection result with respect to the focus detection results in the N areas, and focus is set on a plurality of areas close to the selected predetermined area. This is a focus detection device that performs a detection calculation.

In order to achieve the second object,
According to another aspect of the present invention, there is provided a focus detection apparatus having a plurality of focus detection areas in a screen, wherein the N focus detection results are based on N focus detection areas including a focus detection area selected last time. A focus detection device is configured to select a predetermined area in the area of the above and to perform a focus detection calculation on a plurality of areas adjacent to the selected predetermined area.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a block diagram showing an electrical configuration of a single-lens reflex camera with an automatic focus detection device according to one embodiment of the present invention.

In FIG. 1, 1 is an MPU (micro processing unit), 2 is a memory, and 3 is a focus detection unit for performing AF (auto focus). Note that the MPU 1, the memory 2, and the focus detection unit 3 constitute a focus detection device.

Reference numeral 4 denotes a lens drive unit for driving the photographing optical system based on the detection result of the focus detection unit 3, reference numeral 5 denotes an aperture drive unit, reference numeral 6 denotes a shutter drive unit, and reference numeral 7 denotes a film feed unit. 8 is the camera settings (aperture,
(Shutter speed, etc.) is displayed on a liquid crystal display (not shown). In the ONE SHOT-AF mode, when a specific focus detection area on the screen is selected by focus detection control, the focus detection area is displayed in red using LEDs. This is a display unit for highlight display.

9 is ONE SHOT-AF and AI SERVO-AF
AF switch for switching any one of the AF modes, 10 is a CF switch for setting a CF (custom function) described later, 11 is a main dial for setting shutter speed, aperture value, and the like, SW
1 is a switch that is turned on by the first stroke operation (half-press) of the release button, and SW2 is a second switch of the release button.
A switch that is turned on by a stroke operation (full press).

Next, the main operation of the camera according to the embodiment of the present invention will be described with reference to the flowchart of FIG.

Normally, the power of the camera is turned on, and the operator performs some operation (such as turning on the switch SW1 or the shutter speed,
If the setting of the aperture value or the like is not performed for a certain period of time or longer, the mode shifts to the power saving standby mode (# 001 → # 002 → # 003 → # 0).
04), the MPU 1 is stopped. Then, when the operator performs some operation (YES in step # 005), the MPU 1 is interrupted and performs various operations and settings corresponding to the operation. Of the various operations and settings, the operation of the AF related to the present invention will be described in detail.

In step # 002, the switch SW
If the MPU 1 determines that the focus detection area has been turned on, the process proceeds to step # 006.
1 automatically selects a focus detection point) or arbitrarily selects (the photographer selects one of 45 desired focus detection areas from among 45 points). As a result, if the selection is automatic, step # 007
Then, the routine of “focus detection area automatic selection photographing” is executed. If it is optional, step # 0
The process proceeds to 08, and a routine of “focus detection area arbitrary selection photographing” is executed. This “focus detection area arbitrary selection photographing” is not related to the present invention, and therefore the description is omitted.

The "automatic focus detection area selection" routine is a routine for performing a series of operations for photographing, and will be described with reference to the flowchart of FIG.

First, in step # 102, photometry is performed, and in step # 103, a routine for performing "focus detection control" is executed. Details of this routine will be described later with reference to the flowcharts of FIGS. When the focus detection control routine is completed and the focus detection is performed, the process proceeds to step # 104, where the ONE SHOT-AF mode is set.
AI SERVO-Determines whether the camera is in AF mode.

Here, the ONE SHOT-AF detects the focus and once the lens drive is completed, the switch SW
This mode holds the lens position until 1 is turned off, and is suitable for photographing a stationary subject such as a landscape or a portrait. Also, AI SERVO-AF is a mode in which focus detection control and lens driving are repeated until the switch SW2 is turned on and immediately before the release operation is started while the switch SW1 is turned on, and furthermore, the movement of the subject is detected. In this case, lens driving (prediction AF) is also performed in consideration of the AF time lag and the release time lag. It is suitable for shooting moving subjects such as motor sports and soccer games.

If the result of the above determination is that the camera is in the ONE SHOT-AF mode, the process proceeds to step # 105, where it is determined whether or not the camera is in focus. Step # 1 if not in focus
07, the lens is driven, and the photometry, the focus detection control, and the lens driving are repeated until the lens is focused (# 10).
7 → # 102 → # 103 → # 104 → # 105 → # 10
7 ...).

If the camera is in focus, the flow advances to step # 106 to display the focus detection area on which the focus has been detected on the focus plate. In the next step # 110, the state of the switch SW2 is checked. Then, only when the switch is turned on, the process proceeds to step # 111 to execute the photographing operation. After that, in step # 112, the state of the switch SW1 is checked. If the switch SW1 is turned on, the process proceeds to step # 113.
3 and returns to step # 110.
Until is turned off, the state of the switches SW2 and SW1 is checked. Thereafter, when the switch SW1 is turned off, the process proceeds to step # 114, the routine is terminated, and the process returns to the main routine of FIG.

On the other hand, if the mode is the AI SERVO-AF mode, the process proceeds from step # 104 to step # 108 to determine whether or not the camera is in focus. Then, only when the camera is not in focus, the process proceeds to step # 109 to drive the lens.

Next, as in the ONE SHOT-AF mode,
In step # 110, the state of the switch SW2 is checked. Then, only when it is on, step # 11
Proceed to 1 to execute a shooting operation. Then, step # 1
In step 12, the state of the switch SW1 is checked. If the switch SW1 is turned on, the process proceeds to step # 113.
Mode, the steps # 113 to #
Returning to step 102, the photometry, focus detection control, and lens driving are repeated until the switch SW1 is turned off.
Thereafter, when the switch SW1 is turned off, step # 114 is performed.
To end the routine and return to the main routine of FIG.

Next, the "focus detection control" executed in step # 103 of FIG. 5 will be described with reference to the flowcharts of FIGS.

In step # 202, it is checked whether or not the CF switch (custom function switch for changing the focus detection control according to the subject to be photographed by the operator) 10 is turned on.
In step 07, the routine of "focus detection control when CF switch is turned on" is called, and the routine returns to the routine of FIG. Details of this routine will be described later with reference to the flowcharts of FIGS. In the next step # 203, it is checked whether the camera is in the ONE SHOT-AF mode or the AI SERVO-AF mode.
In step 206, the routine of "focus detection control in AI SERVO-AF" is called, and the process returns to the routine of FIG. The details of this routine will be described later with reference to the flowcharts of FIGS. On the other hand, CF switch and ONE
In the case of the SHOT-AF mode, proceed to step # 204,
The "first priority area setting" routine is called. This routine is performed from the “focus detection control in AI SERVO-AF” routine of FIGS. 8 and 9 and the “CF
This routine is also commonly referred to from the "focus detection control at switch-on" routine, so this routine will be described first with reference to the flowchart of FIG.

First, in step # 402, ONE S
Judge whether the mode is HOT-AF mode or AI SERVO-AF mode.
NE SHOT-If in AF mode, go to step # 403, AI SERV
If the mode is O-AF, the process proceeds to step # 404, and C
It is determined whether the F switch is turned on. As a result, if the ONE SHOT-AF mode and the CF switch are turned off, steps # 403 to # 40
Go to step 5, where the first priority area in ONE SHOT-AF is set, and if the CF switch is on, step #
From 403, proceed to step # 406, where ONE SHO
Set the first priority area at T-AF, CF switch ON. On the other hand, if the AI SERVO-AF mode and the CF switch are off, the process proceeds from step # 404 to step # 407, where the first priority area in AI SERVO-AF is set, and if the CF switch is on, The process proceeds from step # 404 to step # 408, where
AI SERVO-Set the first priority area for AF and CF switch ON.

When the "first priority area setting" routine in FIG. 10 is called from step # 204 in FIG. 6, the setting of the first priority area in the ONE SHOT-AF in step # 405 in FIG. Will be done. Specifically, as shown in FIG. 12 (a), this setting is performed for 1, 4, 7, 18, and 2 indicated by black frames in the 45 focus detection areas.
0, 23, 26, 28, 39, 42 and 45 in total 11
Is set as the first priority area.

Returning to FIG. 6, after setting the first priority area, the process proceeds to step # 205, where 0 is substituted for the variable FLAG1 to start accumulation of the focus detection sensor. Perform a check. If the accumulation of the sensors does not end even after the elapse of a preset time (maximum accumulation time), the process proceeds to step # 210, where the accumulation of the sensors is forcibly terminated and all the image signals are read. Then, in the next step # 211, the focus detection area which is most suitable for evaluating the focus detection area, that is, determining that the focus detection area corresponds to the main subject position from among the 45 focus detection areas (hereinafter, this effective focus area). A final focus detection area (an area where a defocus amount used for focus adjustment is obtained) is searched for as a detection area. A specific method for determining the final focus detection area will be described in the evaluation of the first priority area described later. Then, the process proceeds to step # 221, where the found focus detection area is set as a final focus detection area in which a defocus amount for driving the lens is obtained.

On the other hand, if it is determined in step # 208 that the maximum storage time has not elapsed, the process proceeds to step # 20.
Then, the flow advances to step 9 to check and read the sensor. As this operation, first, it is determined whether or not the accumulation of each sensor has been completed, and if there is a sensor whose accumulation has been completed among the sensors, if the image signal of the sensor has not yet been read, the sensor is not completed. To read image signals. Then, in the next step # 212, it is determined whether or not a new image signal has been read out. If the new image signal has not been read out, the reading and checking of the image signal are repeated unless the maximum accumulation time has elapsed (# 212). → # 208 ...).

If it is determined that a new image signal has been read, the operation proceeds to step # 213, where the correlation operation is performed, and after the completion of the correlation operation, step # 21 in FIG.
Proceed to 4 to determine whether FLAG1 is 0.
Note that FLAG1 is a flag variable which becomes 1 when the correlation calculation is completed in all the focus detection areas of the first priority area, and becomes 0 otherwise. Here, FLAG1
Is determined to be 0, the process proceeds to step # 215, and it is determined whether or not the correlation calculation is completed in all the focus detection areas of the first priority area by reading out a new image signal in step # 209. Here, if it is determined that the processing has not been completed, the reading check and reading of the image signal and the correlation operation are repeated as long as the maximum accumulation time does not elapse (# 215 → # 208 → # 209 ...).
…).

On the other hand, if it is determined that the processing has been completed, the process proceeds to step # 216, FLAG1 is set to 1, and in step # 217, the first priority area is evaluated, and an effective focus is selected from the first priority area. The detection area is determined as a final focus detection area candidate.

More specifically, as shown in the flowchart of FIG. 16, first, in step # 602, all the focus detection areas of the first priority area are set as focus detection area candidates. Then, in the next step # 604, the focus detection reliability is determined for each focus detection area of the first priority area. The focus detection reliability is determined in step # 7 in FIG.
As shown by 02 to # 707, the degree of coincidence between the two image signals to be paired when calculating the contrast and the relative position displacement amount, and the two elements are calculated. Since this operation is general, further description is omitted.

When the reliability of all the regions is determined as described above, the process proceeds to step # 606, and the most effective focus detection region candidate is determined from the focus detection regions satisfying a certain reference value. The focus detection area candidates are comprehensively obtained based on weights set in advance for each focus detection area in the screen, the defocus amount calculated by the correlation calculation, and the like. The method of determining the focus detection area candidate is a known technique in which various methods have been proposed and is not related to the present invention.

Returning to FIG. 7, in step 218, it is determined whether or not the reliability of the selected focus detection area candidate exceeds a predetermined reference value. If it is determined that the reliability exceeds the reference value, step 218 is performed. Proceeding to step # 221, this area is set as the final focus detection area for obtaining the defocus amount used for driving the lens.

If the reference value is not exceeded, a more effective focus detection area may exist in the focus detection area shown in FIG. 12B other than the first priority area. Returning to step # 208, the remaining focus detection area is examined.

Specifically, at step # 216, the FLAG
Since 1 has been set to 1, the process proceeds to step # 219 in step # 214, and the reading check and reading of the image signal and the correlation calculation are repeated unless the maximum accumulation time has elapsed. If it is determined in step # 219 that all the correlation calculations for the remaining focus detection have been completed, the process proceeds to step # 220, where the remaining focus detection areas are evaluated. Here, the focus detection area with the highest evaluation is selected from the evaluation of the first priority area and the evaluation of the other focus detection areas. After the selection is completed, the process proceeds to step # 221, where the selected area is set as a final focus detection area for obtaining a defocus amount for driving the lens.

In the above-mentioned ONE SHOT-AF, the 45 focus detection areas in the screen are divided into two groups as shown in FIGS. 12A and 12B, and one of the divided groups (FIG. 12). (11) of (a) is set as the first priority area, the calculation in this group and its reliability evaluation are performed, and if the evaluation result satisfies a predetermined judgment value, the calculation is performed in the group at that time. Finished. In other words, calculations and evaluations are not performed on the other groups (the group in FIG. 12B).

In the above configuration, in the ONE SHOT-AF that does not consider the movement of the subject, focus detection is not always performed in all focus detection areas. Focus detection can be performed.

Next, the routine of "focus detection control in AI SERVO-AF" executed in step # 206 of FIG. 6 will be described with reference to the flowcharts of FIGS. The basic flow of the processing is shown in FIGS.
This is almost the same as the focus detection control described above and the “focus detection control when the CF switch is turned on” routine in FIGS. 18 and 19 described later.

First, in step # 302, FIG.
The routine of "setting of first priority area" is called. As described above, this routine is commonly called from the “focus detection control” in FIG. 6 and the “focus detection control when the CF switch is turned on” in FIGS. 18 and 19, which will be described later. Figure 10
In step # 407, the first priority area in the AI SERVO-AF is set.

Specifically, as shown in FIG. 14A, only the 23 focus detection areas indicated by a black frame at the center of the 45 focus detection areas are set as the first priority areas. However, this is the initial state, and as described above, AI SERVO-
AF is a shooting mode in which the lens drive follows the movement of the subject. When the subject moves while the focus detection is repeated and the focus detection area moves, the focus detection area is set as the first priority area.

Referring back to FIG. 8, after setting the first priority area, the process proceeds to step # 303, where the variables FLAG1 and FLAG2 are set.
To 0, and the accumulation of the focus detection sensor is started.

When the flow proceeds to step # 304 upon the start of accumulation, the maximum accumulation time is checked here. If the accumulation of the sensors does not end after a preset time (maximum accumulation time) has elapsed, the process proceeds to step # 308, where the accumulation of the sensors is forcibly terminated and all image signals are read. Then, in the next step # 309, the focus detection area is evaluated, that is, the most effective focus detection area is selected from the read focus detection areas. Then, the process proceeds to step # 324, where the selected area is set as a final focus detection area for obtaining a defocus amount for driving the lens.

On the other hand, if it is determined in step # 304 that the maximum storage time has not elapsed, the process proceeds to step # 3.
Proceeding to step 05, sensor reading check and reading are performed. As this operation, first, it is determined whether or not the accumulation of each sensor has been completed. If any of the sensors has completed the accumulation, if the reading of the image signal of the sensor has not been completed yet, the sensor To read image signals. Then, in step # 306, it is determined whether or not a new image signal has been read out. If no new image signal has been read out, the image signal readout check and readout are repeated as long as the maximum accumulation time has not elapsed (# 306 → # 304 → # 305 → # 306 ...
…).

If it is determined that a new image signal has been read, the flow advances to step # 307 to perform the correlation operation. After the correlation operation is completed, the flow advances to step # 310, where FLAG2 is 0. Is determined.
Note that FLAG2 is a flag variable that becomes 1 when the correlation calculation is completed in all the focus detection areas of the second priority area described later, and becomes 0 otherwise. FLA above
If G2 is determined to be 0, the process proceeds to step # 311 in FIG. 9, and if it is determined to be 1, the process proceeds to step # 317.

When the process proceeds to step # 311 in FIG. 9, it is determined whether or not FLAG1 is 0. As described above, FLAG1 is a flag variable which becomes 1 when the correlation calculation is completed in all the focus detection areas of the first priority area, and becomes 0 otherwise. FLAG1 is 0
If it is determined that the image signal has been read, the process proceeds to step # 312.
It is determined whether or not the correlation calculation has been completed in all the focus detection areas of the first priority area. Here, if it is determined that the processing has not been completed, the reading and checking of the image signal and the correlation operation are repeated unless the maximum accumulation time has elapsed (# 312 → # 304 → # 305...).

On the other hand, if it is determined that the process has been completed, the process proceeds to step # 313, where FLAG1 is set to 1. In the next step # 314, the above-mentioned first priority area is evaluated. The most promising focus detection area is determined as a final focus detection area candidate.

Then, in step # 319, it is determined whether or not the reliability of the determined focus detection area candidate exceeds a predetermined reference value. If it is determined that the reliability exceeds the reference value, step # 324 of FIG. Then, this area is set as a final focus detection area for obtaining a defocus amount used for driving the lens.

If the reference value is not exceeded, there is a possibility that a more effective focus detection area exists in the second priority area other than the first priority area shown in FIG. Then, FLAG2 is set to 1, and in the next step # 321, a "setting of second priority area" routine is executed. This routine is also commonly referred to as the “focus detection control when the CF switch is turned on” in FIGS. 18 and 19, and therefore, this routine will be described first with reference to the flowchart in FIG.

First, in step # 502, ONE S
Judge whether the mode is HOT-AF mode or AI SERVO-AF mode.
NE SHOT-If in AF mode, go to step # 503, ONE
SHOT-Sets the second priority area when AF and CF are switched on. If the mode is the AI SERVO-AF mode, the process proceeds to step # 504 to determine whether the CF switch is turned on. As a result, CF in AI SERVO-AF mode
If the switch is off, the process proceeds to step # 505 to set the second priority area in AI SERVO-AF. If the CF switch is on in AI SERVO-AF, the process proceeds to step # 506, where AI SERVO-AF, CF The second priority area at the time of switch-on is set.

Returning to FIG. 9, when this "setting of second priority area" routine is called from step # 321, the setting of the second priority area in the AI SERVO-AF mode in step # 505 of FIG. Will be done. This setting is specifically performed when the 23 focus detection areas in FIG. 14A are set as the first priority areas.
, 13, 13, 22, around the 23 focus detection areas
A total of six focus detection areas 24, 33 and 34 are set as second priority areas.

As described above, in step # 320, FLAG2
Is set to 1 and the second priority area is set in step # 321. In step # 310 in FIG.
17 and the reading check and reading of the image signal and the correlation calculation are repeated unless the maximum accumulation time has elapsed (# 321 → # 304 → # 305 → # 3).
06 → # 307 → # 310 → # 317 ...). And
If it is determined in step # 317 that the correlation calculation has been completed in all the focus detection areas in the second priority area, the process proceeds to step # 318, where the second priority area is evaluated, and the most effective focus among the second priority areas is determined. Select a detection area candidate. Then, in the next step # 322, it is determined whether or not the reliability of the determined focus detection area candidate exceeds a predetermined reference value. If it is determined that the reliability exceeds the reference value, the process proceeds to step 324, where the selection is made. The set area is set as a final focus detection area for obtaining a defocus amount used for driving the lens.

If the value does not exceed the reference value, the process proceeds to step # 323, where FLAG2 is returned to 0 (at this time, FAG
LAG1 is 1). Since there is a possibility that a more effective focus detection area exists in the focus detection area (FIG. 14C) other than the first priority area and the second priority area, step # 304 in FIG.
Return to and investigate the remaining focus detection areas.

Specifically, FLAG2 is 0, FKAG1
Is set to 1, the process proceeds to step # 311 in step # 310 and to step # 315 in step # 311. Unless the maximum accumulation time elapses, the reading check and reading of the image signal and the correlation calculation are performed. Repeat (# 323 → # 304 → # 305 → # 306)
→ # 307 → # 310 → # 311 → # 315 ...). If it is determined in step # 315 that all the correlation calculations for the remaining focus detection have been completed, the process proceeds to step # 316, where the remaining focus detection areas are evaluated. Here, the focus detection area with the highest evaluation is selected from the first priority area, the second priority area, and the other focus detection areas. After the selection is completed, the process proceeds to step # 324 in FIG. 8, and the selected area is set as a final focus detection area for obtaining a defocus amount used for driving the lens.

In the above-described AI SERVO-AF, the 45 focus detection areas in the screen are replaced with the final focus detection area selected in the past (normally, the defocus amount used for the previous lens drive is obtained. FIG. 1 according to the final focus detection area).
The first priority area of the group shown in FIG.
Is divided into the second priority area of the group shown in (However, AI SERV
Since it is O-AF time, these groups will dynamically change according to the final focus detection area selected in the past.) The calculation and evaluation of each group are performed in accordance with the above. If the evaluation result of each group satisfies a predetermined determination value, the calculation is completed at that point.

In the above configuration, in AI SERVO-AF taking into account the movement of the subject, when the photographer follows the moving subject on the screen, it should be noted that the focus detection area once selected is likely to be selected again. In the focus detection area in the screen, evaluation is performed by dividing the focus detection area once selected into a plurality of groups around the focus detection area, and focus is not necessarily detected in all focus detection areas. The calculation is terminated at the point in time, so that the focus detection result satisfying the photographer can be obtained. Therefore, in the case of a moving subject such as a motor sports, especially when a higher speed focus detection is necessary depending on the shooting conditions. Also, accurate focus detection can be performed.

Next, the routine of "focus detection control when the CF switch is turned on" executed in step # 207 of FIG. 6 will be described with reference to the flowcharts of FIGS.

First, in step # 802, FIG.
The routine of "setting of first priority area" is called. This routine is commonly called from the focus detection control routine of FIG. 6 as described above.
When called from 802, in FIG. 10, if the CF switch is on and the camera is in the ONE SHOT-AF mode, step # 4 is executed.
At 06, the first priority area is set when the ONE SHOT-AF, CF switch is turned on. If the CF switch is on and the AI SERVO-AF mode is set, then at step # 408, the AI SERVO-AF, CF switch is turned on. The setting of the first priority area is performed.

This setting is specifically performed in step # 406
In the setting of the first priority area when the ONE SHOT-AF, CF switch is turned on, as shown in FIG. 13A, of the 45 focus detection areas, 4, 18, 20, and 2 indicated by black frames
A total of seven focus detection areas 3, 26, 28 and 42 are set as first priority areas.

Also, the AI SERVO-A of step # 408
In the setting of the first priority area when the F and CF switches are turned on, in addition to the setting of the above-described first priority area, setting is performed in combination with a final focus detection area selected in the past. As described above, the AI SERVO-AF is a shooting mode in which the lens drive follows the movement of the subject. For example, the subject moves while the focus detection is repeated, and the main focus detection area is set as shown in FIG.
Assuming that the focus detection point has moved to 6 in (a), in addition to this focus detection area, 4, 18, 20, 23, 26, 28
And the focus detection areas 42 and 42 are also set as the first priority areas.

Referring back to FIG. 18, after setting the first priority area in accordance with each photographing mode, the process proceeds to step # 803, where 0 is substituted for variables FLAG1 and FLAG2, and accumulation of the focus detection sensor is started.

When the flow advances to step # 804 upon the start of accumulation, the maximum accumulation time is checked here. If the accumulation of the sensors does not end even after the elapse of a preset time (maximum accumulation time), the flow advances to step # 808 to forcibly end the accumulation of the sensors and read out all the image signals. Then, in the next step # 809, the focus detection area is evaluated, that is, the most effective focus detection area is selected from the read focus detection areas. Then, the process proceeds to step # 824 to set the selected area as a final focus detection area for obtaining a defocus amount used for driving the lens.

On the other hand, if it is determined in step # 804 that the maximum storage time has not elapsed, the process proceeds to step # 8.
Proceeding to step 05, sensor reading check and reading are performed. As this operation, first, it is determined whether or not the accumulation of each sensor has been completed. If any of the sensors has completed the accumulation, if the reading of the image signal of the sensor has not been completed yet, the sensor To read image signals. In step # 806, it is determined whether a new image signal has been read out. If the new image signal has not been read out, the image signal readout check and readout are repeated until the maximum accumulation time has elapsed (# 806 → # 804 → # 805 → # 806 ...
…).

If it is determined that a new image signal has been read, the flow advances to step # 807 to perform the correlation operation. After the correlation operation is completed, the flow advances to step # 810, where FLAG2 is 0. Is determined.
Note that FLAG2 is a flag variable that becomes 1 when the correlation calculation is completed in all the focus detection areas of the second priority area described later, and becomes 0 otherwise. FLA above
If G2 is determined to be 0, the process proceeds to step # 811 in FIG. 19, and if it is determined to be 1, the process proceeds to step # 817.

When the process proceeds to step # 811 in FIG.
This time, it is determined whether or not FLAG1 is 0. As described above, FLAG1 is a flag variable which becomes 1 when the correlation calculation is completed in all the focus detection areas of the first priority area, and becomes 0 otherwise. If it is determined that FLAG1 is 0, the process proceeds to step # 812, and it is determined whether the correlation calculation is completed in all the focus detection areas of the first priority area by reading out a new image signal in step # 805. I do. If it is determined that the processing has not been completed, the reading check and reading of the image signal and the correlation operation are repeated as long as the maximum accumulation time has not elapsed (# 821 → # 804 → # 805...).
…).

On the other hand, if it is determined that the process has been completed, the process proceeds to step # 813, FLAG1 is set to 1, and in the next step # 814, the above-described first priority area is evaluated. Then, the most promising focus detection area candidate is determined from the first priority area. In the next step # 819,
It is determined whether or not the reliability of the determined focus detection area candidate exceeds a predetermined reference value. If it is determined that the reliability exceeds the reference value, the process proceeds to step # 820, FLAG2 is set to 1, and the next step is performed. In # 821, a “setting of second priority area” routine is executed. As described above, this routine is commonly called from the routine of "focus detection control in AI SERVO-AF" in FIG. 8, but when this routine is called from step # 821, in FIG. -In the case of the AF mode, in step # 503, ONE SHOT-AF, CF
The second priority area is set at switch-on, and CF is set.
If the switch is on and the AI SERVO-AF mode is set, in step # 506, the second priority area is set when the AI SERVO-AF, CF switch is turned on.

This setting is specifically performed in step # 503
In the setting of the second priority area when the ONE SHOT-AF, CF switch is turned on, for example, when it is determined that 26 focus detection areas are promising among the seven focus detection areas in FIG. As shown in b), a total of eight focus detection areas 7, 15, 16, 25, 27, 36, 37 and 45 around the 26 focus detection areas are set as second priority areas.

Also, the AI SERVO-A of step # 506 is executed.
In setting the second priority area when the F and CF switches are turned on, 6 out of the eight focus detection areas shown in FIG.
When it is determined that the focus detection area of No. is promising, as shown in FIG. 15B, 5, 7, 14 and 1 around the focus detection area of No. 6
A total of four focus detection areas are set as second priority areas.

Returning to FIG. 19, in step # 819, if the reliability of the focus detection area candidate determined in step # 814 does not exceed the predetermined reference value, the first priority area is promising. Although there is no focus detection area, there is a possibility that an effective focus detection area may exist in other focus detection areas. Therefore, the process returns to step # 804 in FIG. 18 to check the remaining focus detection areas. I do.

More specifically, since FLAG1 is set to 1 in step # 813 in FIG. 19, the flow advances to step # 815 in step # 811. Read out and repeat the correlation operation. And step # 8
In 15, if it is determined that all the correlation calculations for the remaining focus detection have been completed, the process proceeds to step # 816, where the remaining focus detection areas are evaluated. Here, the focus detection area with the highest evaluation is selected from all the focus detection areas. After the selection is completed, the process proceeds to step # 824 in FIG. 18, and the selected area is set as the final focus detection area for obtaining the defocus amount used for driving the lens.

On the other hand, in step # 820 of FIG.
When G2 is set to 1 and the second priority area is set in step # 821, the process proceeds to step # 817 in step # 810 in FIG. 18, and the reading of the image signal is checked and performed unless the maximum accumulation time has elapsed. Read out and repeat the correlation operation. If it is determined in step # 817 that the correlation calculation has been completed in all the focus detection areas of the second priority area, the process proceeds to step # 818,
The second priority area is evaluated, and the most effective focus detection area is determined as a focus detection area candidate from the second priority areas. Then, in the next step # 822, it is determined whether or not the reliability of the determined focus detection area candidate exceeds a predetermined reference value. If it is determined that the reliability exceeds the reference value, the process proceeds to step # 824. The selected area is set as a final focus detection area for obtaining a defocus amount for driving the lens.

If the value does not exceed the reference value, the process proceeds to step # 823, where FLAG2 is returned to 0 (at this time, FAG
Since LAG1 is 1), there is a possibility that a more effective focus detection area may exist in the focus detection areas ((FIGS. 14C and 15C) other than the first priority area and the second priority area. Returning to step # 804 of step 8, the remaining focus detection areas are examined.

When the ONE SHOT-AF, CF switch is turned on, the 45 focus detection areas on the screen are first set.
The group shown in FIG. 13A is set as the first priority area, the calculation in this group and the evaluation of its reliability are performed, and the evaluation result of the first priority area further assigns the group to the first priority area. Grouping into a plurality of focus detection areas including the focus detection areas to which they belong (see FIG. 13B), calculation and reliability evaluation are performed, and if the evaluation result satisfies a predetermined determination value, the group at that time is determined. The calculation has been completed with.

In the above configuration, in ONE SHOT-AF that does not consider the movement of the subject, when it is determined that a specific focus detection area is promising as the final focus detection area,
By evaluating the focus detection areas in the vicinity thereof, it is noted that satisfactory focus detection results of the photographer can be obtained by intermediate evaluation results without necessarily performing focus detection in all focus detection areas. In particular, in a case where a more delicate focus detection is required for a stationary subject such as a portrait photographing, high-speed and more accurate focus detection can be performed.

When the AI SERVO-AF, CF switch is turned on, the 45 focus detection areas in the screen are changed to the final focus detection area selected in the past (usually, the defocus amount used for the previous lens drive). Final focus detection area obtained)
15 (a) is dynamically divided into the first priority area (because it is the time of AI SERVO-AF), and this group is set as the processing order of the earliest operation, and the operation is performed according to this order. According to the evaluation result of the first priority area, the second priority area of the group shown in FIG. 15B is dynamically set, and if a predetermined determination value is satisfied in this group, the evaluation is performed. The calculation has been completed at this point.

In the above configuration, in the AI SERVO-AF taking the movement of the object into consideration, not only the focus detection area selected once, but also the evaluation by dividing the focus detection area in the screen into a plurality of areas is performed simultaneously. If it is determined that a specific focus detection area is promising as the final focus detection area, the focus detection areas in the vicinity are evaluated, so that focus detection is not necessarily performed in all focus detection areas, and evaluation in the middle is performed. According to the result, the calculation is terminated at that point, and a focus detection result satisfying the photographer is obtained, so that the moving subject, particularly the moving subject and the main subject of the photographer, frequently changes. Even in shooting such as a soccer game, high-speed and accurate focus detection can be performed.

(Correspondence between Invention and Embodiment) In the above embodiment, FIG. 6 to FIG. 9, FIG.
The portion performing the above operation corresponds to the calculating means of the present invention.

(Modification) In the above embodiment, for example, in FIG. 13, if there is a satisfactory area in the first priority area, a second priority area centered on that area is newly grouped, If there is an appropriate area in this group, the calculation is terminated at that point,
The present invention is not limited to this. Further, a third priority area centered on the optimal area in this group, and further a fourth priority area are newly grouped, and an appropriate area is included in these groups. The calculation may be terminated at a certain point.

In the example shown in FIG. 14, if the first priority area is satisfied, the calculation is terminated at that point. If the first priority area is satisfied, the surrounding area is further calculated. By evaluating (the state of FIG. 14B), if there is a satisfactory area in this area, it is possible to adopt an embodiment in which the calculation is terminated at this point.
Each of the six areas shown in (b) is an effective camera for a subject that is an optimum focus detection target area.

Although the present embodiment has been described with respect to a single-lens reflex camera, the present invention is applicable to other optical devices such as a video camera and an electronic still camera.

Although the focus detecting device is taken as an example, it goes without saying that the present invention can be applied to a distance measuring device having a plurality of distance measuring areas used for measuring the distance to a subject.

[0104]

As described above, according to the present invention,
It is possible to provide a focus detection device, a distance measurement device, or an optical device that can detect high-speed and accurate focus information and distance measurement information even in a device having a large number of focus detection regions and distance measurement regions.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a single-lens reflex camera with an automatic focus detection function according to an embodiment of the present invention.

FIG. 2 is a diagram showing a focus detection area set in a viewfinder of a conventional camera.

FIG. 3 is a diagram illustrating a focus detection area set in a viewfinder of the camera according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a main operation of the camera according to the embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of focus detection point automatic selection photographing executed in step # 007 of FIG. 4;

FIG. 6 is a flowchart showing a part of the operation of focus detection control executed in step # 103 of FIG. 5;

FIG. 7 is a flowchart showing a continuation of the operation in FIG. 6;

FIG. 8 is a flowchart showing a part of the operation of focus detection control executed in step # 206 of FIG. 6;

FIG. 9 is a flowchart showing a continuation of the operation in FIG. 8;

FIG. 10 shows step # 204 in FIG. 6 and step # in FIG.
6 is a flowchart illustrating an operation of setting a first priority area executed in 302.

FIG. 11 is a flowchart showing an operation of setting a second priority area executed in step # 321 of FIG. 9;

FIG. 12 is a diagram illustrating a state in which 45 focus detection areas are grouped into a plurality in the camera according to the embodiment of the present invention.

FIG. 13 is a diagram showing a state in which a plurality of focus detection areas in a ONE SHOT-AF, CF switch on of 45 focus detection areas are grouped in the camera according to the embodiment of the present invention.

FIG. 14 is a diagram showing a state where a plurality of focus detection areas in AI SERVO-AF of 45 focus detection areas are grouped in the camera according to the embodiment of the present invention.

FIG. 15 is a diagram showing a state in which a plurality of focus detection areas of 45 focus detection areas in AI SERVO-AF and CF switch-on are grouped in the camera according to the embodiment of the present invention.

FIG. 16 shows step # 216 in FIG. 7 and step # in FIG.
13 is a flowchart illustrating an operation of evaluating a first priority area executed in 314.

FIG. 17 is a flowchart showing an operation of focus detection reliability determination performed in step # 604 of FIG.

18 is a flowchart showing a part of the operation of focus detection control executed in step # 207 of FIG.

FIG. 19 is a flowchart showing a continuation of the operation in FIG. 18;

[Description of Signs] 1 MPU 2 Memory 3 Focus Detection Unit 4 Lens Drive Unit 9 AF Changeover Switch 10 CF Switch

Claims (26)

[Claims] 1. A focus detection apparatus comprising: a plurality of focus detection areas in a screen; and a calculation means for performing a focus detection operation based on outputs obtained from the plurality of focus detection areas. The plurality of focus detection areas are divided into a plurality of groups, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing and the evaluation are performed in order from the group having the highest priority.
If there is a group that satisfies a predetermined evaluation value, the calculation processing is terminated at that point. 2. A focus detection apparatus comprising: a plurality of focus detection areas in a screen; and a calculation means for performing a focus detection operation based on outputs obtained from the plurality of focus detection areas. The plurality of focus detection areas are divided into a plurality of groups, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing and the evaluation are performed in order from the group having the highest priority.
If there is a group that satisfies the predetermined evaluation value, the focus detection areas belonging to the group are further grouped around a focus evaluation area with a high evaluation, and the calculation processing of the new group and its reliability are performed. As a result of performing the gender evaluation, if any of the evaluations satisfies the evaluation, the calculation processing is terminated at that point. 3. A focus detection apparatus comprising: a plurality of focus detection areas in a screen; and a calculation means for performing a focus detection operation based on outputs obtained from the plurality of focus detection areas. A focus detection area selected in the step (b), and executes a calculation process and an evaluation thereof. If the evaluation result satisfies a certain evaluation value, the calculation process is terminated at that point. 4. The computing means divides the plurality of focus detection areas into a group including the final focus detection area selected in the past and a plurality of groups different from the group. Each group is assigned a priority in the arithmetic processing, and the arithmetic processing and its evaluation are performed in order from the group with the highest priority. The focus detection apparatus according to claim 3, wherein the processing is terminated. 5. A focus detection apparatus comprising: a plurality of focus detection areas in a screen; and calculation means for performing a focus detection operation based on outputs obtained from the plurality of focus detection areas. The plurality of focus detection areas are divided into a group including a final focus detection area selected in the past and a plurality of groups different from the group, and priorities of arithmetic processing are assigned to these groups, and priority is given to each group. The arithmetic processing and its reliability evaluation are performed in order from the group having the highest rank. If there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the arithmetic processing is terminated at that point. Detection device. 6. A focus detection apparatus comprising: a plurality of focus detection areas in a screen; and calculation means for performing a focus detection operation based on outputs obtained from the plurality of focus detection areas. The plurality of focus detection areas are divided into a group including a final focus detection area selected in the past and a plurality of groups different from the group, and priorities of arithmetic processing are assigned to these groups, and priority is given to each group. The arithmetic processing and its evaluation are performed in order from the group having the highest rank. As a result of the evaluation, if there is a group that satisfies a predetermined evaluation value, the higher the evaluation among the focus detection areas belonging to the group, the higher the evaluation. Newly grouped around the focus detection area, and as a result of performing the arithmetic processing and evaluation of the new group, those satisfied with the evaluation Focus detection device, characterized in that to terminate the processing at that point, if any. 7. The method according to claim 1, wherein the calculation means sets a region having the best evaluation result as a final focus detection region when the calculation is completed.
7. The focus detection device according to 4, 5, or 6. 8. A distance measuring apparatus having a plurality of distance measuring areas in a screen and having a calculating means for performing a distance measuring operation based on outputs obtained in the plurality of distance measuring areas, wherein the calculating means comprises: The plurality of ranging areas are divided into a plurality of groups, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing and the evaluation are performed in order from the group having the highest priority. If there is a group that satisfies a predetermined evaluation value, the calculation processing is terminated at that point. 9. A distance measuring apparatus having a plurality of distance measuring areas in a screen and having a calculating means for performing a distance measuring operation based on outputs obtained in the plurality of distance measuring areas, wherein the calculating means comprises: The plurality of ranging areas are divided into a plurality of groups, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing and the evaluation are performed in order from the group having the highest priority. If there is a group that satisfies the predetermined evaluation value, a new group is further formed around a highly evaluated ranging area among the ranging areas belonging to the group, and calculation processing of the new group and its reliability are performed. As a result of performing the gender evaluation, if any of the evaluations satisfies the evaluation, the arithmetic processing is terminated at that point. 10. A distance measuring apparatus having a plurality of distance measurement areas in a screen and having a calculation means for performing a distance measurement operation based on outputs obtained in the plurality of distance measurement areas, wherein the calculation means A distance measurement device for performing a calculation process and its reliability evaluation on the final distance measurement area selected in (1), and terminating the calculation process at that time if a predetermined evaluation value is satisfied. . 11. The arithmetic means divides the plurality of ranging areas into a group including the final ranging area selected in the past and a plurality of groups different from the group. Each group is assigned a priority in the arithmetic processing, and the arithmetic processing and its evaluation are performed in order from the group with the highest priority. The distance measuring apparatus according to claim 10, wherein the processing is terminated. 12. A distance measuring apparatus having a plurality of distance measurement areas in a screen and having a calculation means for performing a distance measurement operation based on outputs obtained in the plurality of distance measurement areas, wherein the calculation means Is divided into a plurality of groups including the final ranging area selected and a group different from the group, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing is performed in order from the group having the highest priority. A distance measuring device, wherein if there is a group that satisfies a predetermined evaluation value as a result of the evaluation, the arithmetic processing is terminated at that time. 13. A distance measuring apparatus having a plurality of distance measuring areas in a screen and having a calculating means for performing a distance measuring operation based on an output obtained in the plurality of distance measuring areas, Is divided into a plurality of groups including the final ranging area selected and a group different from the group, and the priority of the arithmetic processing is assigned to each of the groups, and the arithmetic processing is performed in order from the group having the highest priority. And if the evaluation result shows that there is a group that satisfies the first evaluation value, a new focusing area having a higher evaluation among the ranging areas belonging to the group is newly added. Grouped into
As a result of performing the new group calculation processing and its reliability evaluation, if any of the evaluations is satisfactory, the calculation processing is terminated at that point. 14. The method according to claim 8, wherein the calculating means sets a region having the most optimal evaluation result as a final ranging region when the calculation is completed.
14. The distance measuring device according to 11, 12, or 13. 15. The method of claim 1, 2, 3, 4, 5, 6, or 7.
An optical apparatus comprising the focus detection device according to any one of the preceding claims. 16. An optical apparatus comprising the distance measuring device according to claim 8, 9, 10, 11, 12, or 13. 17. A focus detection device having a plurality of focus detection areas in a screen, wherein a focus detection calculation is performed on N of the plurality of focus detection areas, and the focus in the N areas is determined. When the detection result satisfies a predetermined evaluation condition, the focus state is determined based on the focus detection result in the N areas, and the focus detection result in the N areas satisfies a predetermined evaluation condition. A focus detection device configured to perform focus detection calculation on M regions other than the N regions when not performed. 18. A focus detection device having a plurality of focus detection areas in a screen, wherein focus detection calculation is performed on N areas among the plurality of focus detection areas, and the focus in the N areas is determined. A predetermined area in the N areas is selected based on a focus detection result with respect to the detection result, and a focus detection calculation is performed on a plurality of areas close to the selected predetermined area. A focus detection device characterized by the above-mentioned. 19. The focus detection apparatus according to claim 18, wherein a plurality of areas adjacent to the predetermined area do not include the N areas. 20. The focus detection apparatus according to claim 18, wherein the predetermined area is an area satisfying a specific evaluation condition among the N focus detection results. 21. The focus detection apparatus according to claim 20, wherein the specific evaluation condition is a most appropriate focus detection result among the focus detection results in the N areas. 22. A focus detection device having a plurality of focus detection areas in a screen, wherein a predetermined area in the N areas is determined based on focus detection results in N areas including a focus detection area selected last time. Wherein a focus detection operation is performed on a plurality of areas close to the selected predetermined area. 23. The focus detection apparatus according to claim 22, wherein a plurality of areas adjacent to the predetermined area do not include the N areas. 24. The focus detection apparatus according to claim 22, wherein the predetermined area is an area satisfying a specific evaluation condition among the N focus detection results. 25. The focus detection apparatus according to claim 24, wherein the specific evaluation condition is a most appropriate focus detection result among the focus detection results in the N areas. 26. The method according to claim 18, wherein a focus state is determined based on a result satisfying a specific selection criterion among the focus detection calculation results in each of the regions.
The focus detection device according to 21, 22, 24, 24 or 25.