JPH055830A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To provide an automatic focusing camera capable of photographing a moving object by a photographing distance, or magnification set in advance. CONSTITUTION:The automatic focusing camera is provided with a distance setting means 109 for setting a desired photographing distance, a time predicting means 110 for predicting a time necessary for an object being at a present position to reach a photographing distance position set by the distance setting means 109 based on the photographing distance detected by a distance detecting means 106 and the moving speed calculated by a speed calculating means 108 when it is decided by a still/moving deciding means 103 that the object is moving, and an activating means 112 for starting the exposure operation of an exposure controlling means 111 when the predictive time is equal to a release delay time from a shutter release time until an actual exposure time, and then, a film is exposed when the moving object reaches the photographing distance set in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with an automatic focusing device.

[0002]

2. Description of the Related Art The defocus amount of a photographing lens is detected,
If the subject is still or moving based on the latest and past multiple defocus amounts detected, and if it is determined to be still, lens drive to focus the shooting lens based on the latest defocus amount. The amount is obtained, and the photographing lens is drive-controlled according to this drive amount. On the other hand, when it is determined to be moving, the lens drive amount for tracking the shooting lens on the moving subject is obtained based on the latest and past multiple defocus amounts, and the drive control of the shooting lens is automatically performed according to this drive amount. Focusing cameras are known.

[0003]

By the way, when shooting a moving subject repeatedly passing through the same course, for example, when shooting a relay competition performed on a track in a stadium, the same shooting distance or I sometimes want to shoot at magnification. In such a case, the subject approaching the camera or moving away from the camera will be shot continuously before the desired shooting distance or magnification is reached, and the desired shooting distance and magnification will be selected from the multiple shots. There is a shooting method to choose.

However, in such a photographing method,
Due to variations in release timing, the subject may have a desired shooting distance and a time at which the magnification does not match the exposure time, and since continuous shooting is performed to obtain one photograph at a desired shooting distance and magnification, There is a problem that the film is wasted.

It is an object of the present invention to provide an automatic focusing camera capable of photographing a moving subject at a preset photographing distance or magnification.

[0006]

The invention according to claim 1 will be described with reference to FIG. 1 which is a claim correspondence diagram.
The invention of claim 1 is based on the taking lens 101, the focus detecting means 102 for detecting the defocus amount of the taking lens 101 at a certain detection time interval, and the latest and past plural defocus amounts detected by the focus detecting means 102. The stationary movement determining means 103 for determining whether the subject is stationary or moving, and the focus detecting means 1 when the stationary movement determining means 103 determines that the subject is stationary.
On the basis of the latest defocus amount detected in 02, the lens drive amount for focusing the photographing lens 101 on the subject is calculated, and when the stationary movement determination means 103 determines that the subject is moving, A calculation unit 104 that calculates a lens drive amount for tracking the photographic lens 101 on a subject based on the latest and past multiple defocus amounts detected by the focus detection unit 102, and is calculated by this calculation unit 104. A lens driving unit 105 that drives the photographing lens 101 according to the lens driving amount, and a distance detecting unit 106 that detects the photographing distance to the subject.
A focal length detecting unit 107 for detecting the focal length of the taking lens 101, the latest and past plural defocus amounts detected by the focus detecting unit 102 and their detection time intervals, and the defocus detected by the distance detecting unit 106. Shooting distance at the time of detecting the amount and the focal length detecting means 10
Speed calculating means 108 for calculating the moving speed of the subject based on the focal length at the time of detecting the defocus amount detected by 7, and distance setting means 1 for setting a desired shooting distance.
09, and when the stationary movement determining unit 103 determines that the subject is moving, the subject is currently moving based on the shooting distance detected by the distance detecting unit 106 and the moving speed calculated by the speed calculating unit 108. Time prediction means 110 that predicts the required time from when the camera reaches the position of the shooting distance set in the distance setting means 109, exposure control means 111 that controls the exposure operation, and time prediction means 1
The start control unit 112 starts the exposure operation of the exposure control unit 111 when the predicted time by 10 and the release delay time from the shutter release time to the actual exposure time become equal, thereby achieving the above object. ..

The invention of claim 2 will be described with reference to FIG. 2 which is a claim correspondence diagram. In the invention of claim 2, the taking lens 201 and the taking lens 2 have a certain detection time interval.
Focus detection means 202 for detecting the defocus amount of 01
And a stationary movement determination means 203 for determining whether the subject is stationary or moving based on the latest and past multiple defocus amounts detected by the focus detection means 202.
When the stationary movement determination means 203 determines that the subject is stationary, the taking lens 201 is determined based on the latest defocus amount detected by the focus detection means 202.
The lens drive amount for focusing on the subject is calculated, and when the stationary movement determination means 203 determines that the subject is moving, the latest and past multiple defocuses detected by the focus detection means 202 are calculated. A calculation unit 204 for calculating a lens driving amount for tracking the photographing lens 201 on the subject based on the amount; a lens driving unit for driving the photographing lens 201 according to the lens driving amount calculated by the calculation unit 204; Distance detecting means 206 for detecting the shooting distance up to, a focal length detecting means 207 for detecting the focal length of the taking lens 201, the latest and past multiple defocus amounts detected by the focus detecting means 202, and their detection times. Interval, shooting distance at the time of detecting the defocus amount detected by the distance detecting unit 206, and focal length Out on the basis of the focal distance at the time of the defocus amount detection detected by means 207, the speed calculating means 208 for calculating a moving speed of the object, the magnification setting means 209 for setting a desired magnification, stationary movement determining means 2
When it is determined by 03 that the subject is moving,
Based on the shooting distance detected by the distance detection unit 206 and the moving speed calculated by the speed calculation unit 208, the time required for the subject to reach the position of the magnification set in the magnification setting unit 209 from the present time is predicted. Time prediction means 210 and exposure control means 21 for controlling the exposure operation
1 and the activation means 212 for starting the exposure operation of the exposure control means 211 when the estimated time by the time estimation means 210 and the release delay time from the shutter release time to the actual exposure time become equal. ,
To achieve the above objectives.

The exposure control means 111A (211A) of the automatic focusing camera according to claim 3 is the activation means 112 (21).
After being activated by 2), the exposure operation is continuously performed.

[0009]

According to the present invention, when the time predicting means 110 determines that the subject is moving by the stationary movement determining means 103, the photographing distance detected by the distance detecting means 106 and the speed calculating means 108 calculate. The distance setting means 10 from the present time based on the moving speed
The time required to reach the position of the photographing distance set to 9 is predicted, and the activation unit 112 makes the time predicted by the time prediction unit 110 equal to the release delay time from the shutter release time to the actual exposure time. At some times, the exposure operation of the exposure control means 111 is started.

In the second aspect, the time predicting means 210 calculates the photographing distance detected by the distance detecting means 206 and the speed calculating means 208 when the stationary movement judging means 203 judges that the subject is moving. Based on the moving speed, the time required for the subject to reach the position of the magnification set in the magnification setting means 209 from the present time is predicted, and the activation means 212 uses the time predicted by the time prediction means 210 and the shutter release time. When the release delay time up to the actual exposure time becomes equal, the exposure operation of the exposure control means 211 is started.

In the third aspect, the exposure control means 111A (2
11A) is continuously exposed after being activated by the activation means 112 (212).

[0012]

FIG. 3 is a block diagram showing the structure of an embodiment. The AFCPU 1 is a microcomputer that performs arithmetic processing for automatic focus adjustment and lens control, and a main CPU.
Reference numeral 2 is a microcomputer that performs sequence control such as exposure control, film winding, and shutter charge. The taking lens 3 is a lens whose focus can be adjusted by moving in the optical axis direction. The distance setter 11 is a setter that sets a subject distance desired by the photographer, and the set distance information is sent to the AFCPU 1. The magnification setting device 12
This is a setting device for setting the photographing magnification desired by the photographer, and the set magnification information is sent to the AFCPU 1. The AF sensor 13 is composed of a focus detection optical system and a photoelectric conversion element, and the light flux that passes through the taking lens 3 causes the subject image corresponding to the light intensity distribution of the subject image formed in a plurality of areas on the screen. Generate a signal. AFCPU1
Well-known arithmetic processing is performed on this subject image signal to detect the defocus amount of the subject image plane formed in a plurality of areas on the screen with respect to the planned focal plane (film plane).

An example of the structure of the AF sensor 13 is shown in FIG. A
The F sensor 13 includes a field mask 40 and a field lens 4.
One and two pairs of reimaging lenses 42A, 42B, 43A,
A focus detection optical system 44 composed of 43B and two pairs of light receiving portions 4
5A, 45B, 46A, 46B, and a photoelectric conversion element 47 such as a CCD. In the above configuration, two pairs of regions 35A, 35B, 36A, 36 symmetrical with respect to the optical axis 34 included in the exit pupil 33 of the taking lens 3 are provided.
The light flux passing through B forms a primary image near the field mask 40 having an aperture corresponding to the focus detection area shown in FIG. A part of the primary image formed in the opening of the field mask 40 is further covered by the field lens 41 and the two pairs of re-imaging lenses 4.
The photoelectric conversion element 47 is formed by 2A, 42B, 43A, and 43B.
2 on the two pairs of light receiving parts 45A, 45B, 46A, 46B
It is formed as a pair of secondary images.

As is well known, the relative positional relationship in the arrangement direction of the light receiving portions of the secondary images paired on the photoelectric conversion element 47 is expressed as follows.
The defocus amount of the taking lens 3 can be detected by detecting using the subject image signal generated by the photoelectric conversion element 47. Further, by detecting this positional relationship for each of the plurality of focus detection areas set on the photographing screen as shown in FIG. 5, the defocus amount can be detected for each focus detection area.

FIG. 5 shows a plurality of focus detection areas set in a vertical and horizontal cross shape in the center of the screen, and an area F1 in the long side direction of the screen.
~ F5, a total of eight areas F6 to F8 in the short side direction are set, and the defocus amount is detected in each area. FIG. 6 shows another example in which focus detection areas on the left and right sides of the screen are added to the focus detection area at the center of the screen. Areas F9 to F11 in the short side direction on the left side of the screen, areas F12 to F in the short side direction on the right side of the screen
14 is set.

Returning to FIG. 3 again, the explanation will be continued. The movement detection device 14 is configured by a known acceleration sensor or the like, and detects movement or blurring of the lens or the body. The output of the motion detection device 14 is sent to the AFCPU 1,
The movement (positional change) of the lens or the body is determined.
The motor 15 receives the drive control signal from the AFCPU 1 and moves the focusing lens of the taking lens 3 in the optical axis direction via a gear system (not shown). AFCPU1
The driving direction and the driving amount of the motor 15 are controlled according to the defocus amount, and the taking lens 3 is focused. The distance detection device 31 is a device that encodes the absolute position of the focusing lens of the taking lens 3, and the encoded signal is sent to the AFCPU 1 to detect the subject distance in which the focusing lens is set at the current position. The focal length detection device 32 is a device that encodes the absolute position of the zoom lens of the taking lens 3, and the encoded signal is sent to the AFCPU 1 to detect the focal length set at the current position of the zoom lens. ..

The release button 20 is an operation member for activating the automatic focus adjustment operation by half-pressing it and activating the exposure operation (photographing operation) by full-pressing it, and from the released state to the half-pressed state to the fully-pressed state. Move. When the release button 20 is pressed halfway, a half-press signal is sent to the AFCPU 1, and when it is fully pressed, a full-press signal is sent to the main CPU 2. The AFCPU1 generates the A signal, and the main CPU
Request the start of exposure operation to 2 and set the frame speed during continuous shooting. The frame speed setting device 21 is a setting device for setting the frame speed and the winding mode at the time of continuous shooting from the outside, and the set frame speed and winding mode information is sent to the main CPU 2. The main CPU 2 responds to a full-press signal of the shutter button 20 or an A signal from the AFCPU 1 in accordance with brightness information and exposure control mode information obtained from a photometric device (not shown), and the diaphragm mechanism unit 33 and the shutter mechanism unit 22. To control. At the time of exposure, the winding device 23, the shutter charge mechanism section 24, and the mirror mechanism section 25 are controlled. Further, the timing information of these sequences is sent to the AFCPU 1 as an M signal.

Next, various quantities used in this embodiment are defined as follows. FIG. 7 shows the movement X1 of the ideal image plane of the moving subject.
9A and 9B are diagrams showing the movement X2 of the image plane when the photographing lens 3 is driven by performing the automatic focus adjustment operation. The definition of various quantities will be described with reference to this figure. (1) The suffix n represents the number of focus detection operations.
n = 1, 2, 3, ... (2) The plurality of defocus amounts detected in the plurality of focus detection areas in the focus detection operation are da, db, ..., d.
z. However, the sign of the defocus amount in the rear focus state is +. A plurality of defocus amounts da, db,
..., dz are obtained based on the outputs of the same accumulation time of the AF sensor 13. In some cases, the focus cannot be detected and the defocus amount cannot be detected. In that case, da =
Represented as @, db = @, ..., dz = @. (3) The time at the midpoint of the charge accumulation period is tn-1, tn, t
Let n + 1, ...

(4) A plurality of defocus amounts da, db,
The defocus amount finally selected from dz is the selected defocus amount d as a result of the n-th focus detection.
n. The defocus amount dn is obtained after the calculation is completed at time ten which is later than time tn. (5) Plural defocus amounts da, db, ..., dz
Among them, the defocus amount indicating the closest distance is set as the closest defocus amount rn. rn = MAX (da, db, ..., dz) (1) However, when focus cannot be detected, it is expressed as rn = @. In the calculation of the closest defocus amount rn, among the plurality of defocus amounts da, db, ..., dz, the focus detection region has a focus detection region near the center of the screen (for example,
Regions F2 to F4 and F6 to F8 in FIG. 5, and regions F1 to F1 in FIG.
The closest defocus amount when the defocus amount of F8) is limited is r'n. In addition, a plurality of defocus amounts d
It is assumed that a, db, ..., Dz are obtained based on the output of the AF sensor 13 at the same accumulation time.
If each defocus amount is obtained based on the output of different accumulation time, different overlap correction amount is calculated according to each accumulation time to perform overlap correction as described later, and It suffices to select the closest defocus amount among the plurality of defocus amounts.

(6) A plurality of defocus amounts da, db,
The defocus amount that is closest to the defocus amount of a predetermined value K4 or more and K5 or less among the dz is set as the closest defocus amount sn. sn = MAX (ba, bb, ..., bz) (2) where ba, bb, ..., bz are K4 <(da,
It is assumed that the condition of db, ..., dz) <K5 is satisfied. For example, if K4 <da <K5, ba = da; otherwise, no ba. When no focus can be detected or when ba, bb, ..., Bz satisfying the conditions are not present, s
Expressed as n = @. In the calculation of the closest defocus amount sn, a plurality of defocus amounts da, db, ...
In z, the focus detection area is close to the focus detection area near the center of the screen (for example, the areas F2 to F4, F6 to F8 in FIG. 5, and the areas F1 to F8 in FIG. 6) when the defocus amount is limited. The defocus amount is s'n. Predetermined value K4, K
The reason for setting the limit of 5 is to detect only the subject protruding from the background without being affected by an obstacle in the vicinity, for example, K4 = -4 mm, K5 = 4 mm.
Keep to a degree. Further, K4 and K5 may be adjusted in consideration of the lens focal length, magnification, brightness, and current focus detection time (whether or not a release is performed). The closest defocus amount sn is used for tracking determination of a subject partially protruding from the background in the later-described current priority state.

(7) The overlap correction amount Dc is the difference Lc = Len-La between the average lens position Lan during the accumulation time and the lens position Len at the defocus amount calculation time ten.
It is an amount obtained by converting n into the image plane movement amount. Dc = C * Lc where C is a conversion coefficient. (3) It is also assumed that the relationship between the lens movement amount and the image plane movement amount is almost linear regardless of the lens position and the subject position. Further, a plurality of defocus amounts da, db, ..., dz
Is assumed to have been obtained based on the output of the same accumulation time of the AF sensor 13, but when the respective defocus amounts are obtained based on the output of different accumulation times, according to the respective accumulation times. Different overlap correction amounts will be calculated. (8) Multiple defocus amounts da, db, ..., dz
The defocus amount that shows the minimum absolute value among the defocus amounts that have been subjected to overlap correction is set to the current priority defocus amount p.
n. For example, | db-Dc | = MIN (| da-
In the case of Dc |, | db-Dc |, ..., | dz-Dc |), pn = db. When focus cannot be detected, pn =
Expressed as @. In calculating the current priority defocus amount pn, a plurality of defocus amounts da, db, ...
Of the focus detection area near the center of the screen (for example, areas F2 to F4, F6 to F8 in FIG.
If the defocus amount is limited to the regions F1 to F8), the closest defocus amount is set to p′n.

(9) Corrected defocus amount D (n-1) n
Is an amount obtained by converting the lens movement amount L (n-1) n driven between the times t (n-1) and tn into the image plane movement amount. D (n-1) n = C * L (n-1) n ... (5) When n = 1, D (n-1) n = 0. (10) The image plane velocity V (n-1) n is the time t (n-1).
Is the speed at which the image plane moves between tn and tn. When the two defocus amounts d (n-1) and dn are fixed, the image plane velocity V (n-1) n is obtained as follows. V (n-1) n = (dn + D (n-1) nd (n-1)) / (tn-t (n-1)) (6) However, two defocus amounts d ( n-1), dn = @
In the case of, and in the case of n-1, it is expressed as V (n-1) n = @. In the above, the image plane velocity is calculated from two consecutive defocus amounts, but if the detection time interval is short, the calculation result will include an error and lose reliability.
Every other time, the time interval may be lengthened.

(11) Current image plane velocities Va, Vb, ...
, Vz is the plurality of defocus amounts d detected this time
Image surface velocities obtained for a, db, ..., Dz. Va = (da + D (n-1) n-d (n-1)) / (tn-t (n-1)) ... (7) Vb = (db + D (n-1) n-d (n- 1)) / (tn-t (n-1)) ... (8) ... Vz = (dz + D (n-1) n-d (n-1)) / (tn-t (n-1) )) (9) However, the defocus amount d (n-1) or da, d
If b, ..., dz = @ and n = 1, then V
It is expressed as a, Vb, ..., Vz = @. (12) The current expected image plane velocity Vf (n-1) n is an image plane velocity determined in consideration of continuity from the previous image plane velocity V (n-2) (n-1). Vf (n−1) n = α * V (n−2) (n−1) + β (10) However, when V (n−2) (n−1) = @, Vf
(N-1) Let n = @. Coefficients α and β are the image plane moving direction, lens focal length, magnification, image plane acceleration, brightness, current focus detection time (with or without release), ratio of previous and current focus detection time intervals (with or without release). ) And adjust.

(13) Multiple defocus amounts da, d
The tracking defocus amount fn is the defocus amount that optimizes the continuity of the image surface velocity from b, ..., Dz. That is, among the current image surface velocities Va, Vb, ..., Vz, the defocus amount that minimizes the difference from the predicted image surface velocity Vf (n-1) n is set as the tracking defocus amount fn. .. For example, | Vf (n-1) n-Vb | = MIN (| Vf (n-1) n-Va |, | Vf (n-1) n-Vb |, ..., | Vf (n-1) ) N-Vz |) ... In the case of (11), fn = db. However, Vf (n-2) (n
-1) = @, or Va, Vb, ..., Vz =
If @, set fn = @. In addition, the continuity of the focus detection area may be introduced in order to improve tracking stability. For example, in the above determination, among Va, Vb, ..., Vz, the image surface speed of the previously adopted focus detection area is prioritized, or the image surface speed of the area near the previously adopted focus detection area is prioritized. Restrict.

(14) Close-up image plane velocity Vs (n-1) n
Is the speed at which the closest image plane moves between times t (n-1) and tn. Two closest defocus amounts s (n-1),
When sn is determined, the closest image surface velocity Vs (n-1) n is obtained as follows. Vs (n-1) n = (sn + D (n-1) n-s (n-1)) / (tn-t (n-1)) (12) However, two defocus amounts s ( n-1) or sn
= @ And n = 1, it is represented as Vs (n-1) n = @. The closest image surface velocity Vs (n-1) n is
It is used for tracking determination of a subject that partially stands out from the background in the current priority state.

The operation will be described using the above definitions of various quantities. The apparatus of the embodiment has five operating states, and
As shown in FIG. 9, each operating state transits. Note that these operations are controlled by the AFCPU 1. [Non-operation state] In this state, the focus detection operation is not performed. Therefore, the defocus amount is not detected. In order to improve the responsiveness after the release button 20 is half pressed,
The same operation as in the closest state may be performed by performing focus detection by prohibiting lens driving and display. [Closest state] A plurality of defocus amounts da, db, ...
, Dz, the closest defocus amount rn of this time is selected as the selected defocus amount dn of this time. This operation is called focus detection 1. dn = rn

[Current priority state] A plurality of defocus amounts d obtained from sensor outputs by causing the AF sensor 13 to perform accumulation operation.
, dz, a plurality of defocus amounts da, db, ... Are selected as the selected defocus amount dn of this time.
... Selects the defocus amount pn that has the smallest absolute value among the defocus amounts in which dz is overlap-corrected. This operation is called focus detection 2. dn = pn [Tracking state] A plurality of defocus amounts da, db, ...
A defocus amount fn that optimizes the continuity of the image plane velocity is selected from dz. This operation is called focus detection 3. dn = fn [Focused focus lock state] A plurality of defocus amounts d obtained from the sensor output by causing the AF sensor 13 to perform the accumulation operation.
, dz, a plurality of defocus amounts da, db, ... Are selected as the selected defocus amount dn of this time.
... Selects the defocus amount pn that has the smallest absolute value among the defocus amounts in which dz is overlap-corrected. This operation is called focus detection 2. dn = pn Further, in the focus focus lock state, the lens drive is prohibited and the display is locked in the focus display. Therefore, the overlap correction amount becomes zero. Further, except for the automatic switching mode described later, the focus focus lock state and the non-operation state are substantially the same. In the automatic switching mode, the focus state may shift from the focus lock state to the tracking state.

The accumulation operation of the AF sensor 13 in the above state is carried out only when the mirror is down according to the M signal from the main CPU 2.

The conditions for determining the transition of each operating state are as follows. In the following, YES indicates a case where the determination result is affirmative, and NO indicates a case where the determination result is negative. [Focus determination 1] YES: Latest closest defocus amount r
The absolute value of n is smaller than the predetermined value K1. | Rn | <K1 NO: The absolute value of the latest closest defocus amount rn is not less than the predetermined value K1. | Rn | ≧ K1 [focus determination 2] YES: The absolute value of the latest current priority defocus amount pn is smaller than the predetermined value K2. | Pn | <K2 NO: The absolute value of the latest current priority defocus amount pn is equal to or larger than the predetermined value K2. | Pn | ≧ K2 In order to improve the temporal stability of the focus determination 2,
It is also conceivable to take a weighted average with the past current priority defocus amount. In this case, the current time average defocus amount pn 'is as follows. pn '= (w0 * pn + w1 * p (n-1) + ... + wm * p (n-m)) / ws ... (13) ws = w0 + w1 + ... + wm ... (14) The range of the defocus amount used for taking is the defocus amount when the focus determination 2 is continuous, that is, when the lens is stopped. Focus determination 2 with respect to the time average defocus amount obtained in this way
Will be done.

[Focusing determination 3] YES: The absolute value of the latest current priority defocus amount pn is smaller than the predetermined value K3. | Pn | <K3 NO: The absolute value of the latest current priority defocus amount pn is equal to or larger than the predetermined value K3. | Pn | ≧ K3 The above coefficient is K1 <K2 <K3. Also K1,
K2 and K3 may be adjusted by taking into consideration the lens focal length, magnification, brightness, current focus detection time (presence or absence of release), and the like. [Focusing determination 4] YES: In the focusing determination 3, YES has occurred consecutively N times in the past. NO: Other than the above

Tracking determination means determining whether the subject is stationary or moving. When the subject is moving, the lens drive control for tracking the subject is activated. [Tracking determination 1] YES: d (n-2), d (n-1), dn ≠ @, and | d (n-2) |, | d (n-1) |, | dn
| <Dk and V (n-2) (n-1), V (n-1) n ≠ @ and | V (n-2) (n-1) |> Vk and | V (n- 1) n |> Vk and 0 <Kmin <V (n-2) (n-1) / V
The condition (n-1) n <Kmax is for avoiding the tracking determination because the calculated image plane velocity is low in reliability when the image planes are significantly separated. Under the above condition, the difference may be used instead of the ratio of the two image surface velocities. Furthermore, predetermined values dk, Vk,
Kmin and Kmax are image plane moving direction, lens focal length, magnification, image plane acceleration, luminance, current focus detection time (with or without release), ratio of previous and current focus detection time intervals (with or without release) Adjust with consideration. NO: Other than the above

[Tracking determination 2] YES: s (n-2), s (n-1), sn ≠ @, and | s (n-2) |, | s (n-1) |, | sn
| <Dk and Vs (n-2) (n-1), Vs (n-1) n
≠ @ and Vs (n-2) (n-1)> Vk and Vs (n-1) n> Vk and 0 <Kmin <Vs (n-2) (n-1) / V
The condition of s (n-1) n <Kmax is for avoiding the tracking determination because the reliability of the calculated image plane velocity is low when the image planes are far apart. The other condition is to limit the tracking determination only when the subject approaches. Further, under the condition of, the difference may be used instead of the ratio of the two image surface velocities. The predetermined values dk, Vk, Kmin, and Kmax are the image plane moving direction, the lens focal length, the magnification, the image plane acceleration, the brightness, the current focus detection time (whether or not there is a release), and the ratio of the previous and current focus detection time intervals ( Adjust with or without release). NO: Other than the above

[Tracking determination 3] Instead of the selected defocus amount dn in the tracking determination 1, the closest priority defocus amount r'n with center priority in the closest state, and the current priority priority defocus amount with center priority in the current priority state. Using p'n, the same determination as the tracking determination 1 is performed based on this defocus amount and the image plane velocity calculated from this defocus amount. In addition,
The tracking determination 1 may be performed when the determination is NO. With this configuration, the static movement of the subject can be preferentially determined in the focus detection area in the center of the screen in the focus detection area. [Tracking determination 4] Instead of the closest defocus amount sn in the tracking determination 2, the center priority closest defocus amount s'n is used, and this defocus amount and the image plane velocity calculated from this defocus amount are used. Based on this, the same determination as the tracking determination 2 is performed. The tracking determination 2 may be performed when the determination is NO. With this configuration, the static movement of the subject can be preferentially determined in the focus detection area in the center of the screen in the focus detection area.

Next, the lens drive control will be described. [Lens drive 1] This is lens drive control in the closest state and the current state priority state, and controls the lens movement amount Lx. Lx = Ln-Lc (15) Here, the lens movement amount Ln is an amount obtained by converting the defocus amount dn selected this time into a lens movement amount. Ln = dn / C (16) [Lens drive 2] Lens drive control (speed control type) in the tracking state, and the amount of lens movement until the ideal image plane movement and the actual image plane movement match. Is controlled (at full speed), and after the movement of the image plane matches, the movement speed is controlled to follow the movement of the ideal image plane. The lens movement amount Lx is Lx = Ln-Lc + V (n-1) n * t / C (17) Here, t is the elapsed time from the midpoint of the accumulation time. Even after catching up with the target, the target lens movement amount is updated by a timer interruption that takes place at regular intervals. Alternatively, the speed may be controlled in real time.

Another example of the lens drive 2 described above will be described. [Lens drive 2A] This is lens drive control (overlap control type) in the tracking state, and after a predetermined time Tx from the time of the midpoint of the current accumulation time (the time has already passed until the defocus amount is calculated). , The lens movement amount Ln is determined so that the image planes coincide with each other. The lens movement amount Lx is as follows: Lx = Ln-Lc + V (n-1) n * Tx / C (18) Further, in the above lens drive 2, when a lens drive means is incorporated on the photographing lens 3 side, Information on the current defocus amount dn and image plane velocity V (n-1) n is sent from the body side to the taking lens 3 side, and the taking lens 3 side controls the above-mentioned lens drive 2 according to these information. You can With this configuration, it is not necessary to uniformly control various interchangeable lenses on the body side, and optimized lens drive control can be performed for each lens. It is especially effective for special lenses such as microlenses.

FIG. 8 is a state transition diagram in the continuous mode (without focus lock after focusing).
The transition between each state will be described. A: The shutter release half-press signal is OFF, the closest
Priority is given to the current status, and the status changes from the tracking status to the non-operating status. The initial state when the power is turned on is the non-operation state. B: When the shutter release half-press signal is turned ON, the non-operating state shifts to the closest state. C: When the tracking determination 1 is NO and the focus determination 1 is NO,
The lens drive 1 (normal drive) is performed and the closest state is maintained. D: When the tracking determination 1 is NO and the focus determination 1 is YES, the photographing lens 3 is not driven and the closest state is changed to the current priority state. E: If the tracking determination 1 is YES, the lens drive 2 (tracking drive) is performed to shift from the closest state to the tracking state. F: If the tracking determination 1 is NO, the tracking determination 2 is NO, and the focus determination 2 is YES, the taking lens 3 is not driven and the current priority state is maintained. G: When the tracking determination 1 is NO, the tracking determination 2 is NO, the focus determination 2 is NO, and the focus determination 3 is YES, the lens drive 1 (normal drive) is performed to maintain the current priority state.

H: When the tracking determination 1 is NO, the tracking determination 2 is NO, the focus determination 2 is NO, and the focus determination 3 is NO, the selected defocus amount of this time is dn = pn to dn = Change to rn and perform lens drive 1 (normal drive) to shift from the current priority state to the closest state. I: When the tracking determination 1 is YES or the tracking determination 2 is YES, when the tracking determination 2 is YES, the selected defocus amount dn = p at this time is selected so that the transition to the tracking state does not cause any trouble.
n to dn = sn, and image plane velocity V (n-1) n = Vp (n
-1) n is rewritten to V (n-1) n = Vs (n-1) n. Then, the lens drive 2 (tracking drive) is performed to shift from the current priority state to the tracking state. J: If the tracking determination 1 is YES, the lens drive 2 (tracking drive) is performed to maintain the tracking state. K: When the tracking determination 1 is NO, the current selected defocus amount dn = pn is changed to dn = rn. Then, the lens drive 1 (normal drive) is performed to shift from the tracking state to the closest state.

10 and 11 are flow charts showing an example of the automatic focus adjustment control program in the continuous mode. The operation in the continuous mode will be described with reference to these flowcharts. [Inactive state] In step S100, the power is turned on
Then, the process proceeds to step S101 (non-operating state). In step S101, when the half-press signal is turned on, the process proceeds to step S102 (shifts to the closest state). [Nearest state] Focus detection 1 is performed in step S102, tracking determination 1 is performed in subsequent step S103, and if affirmative, the process proceeds to step S120 (shifts to the tracking state),
When denied, it will progress to step S104. Step S10
In 4, in-focus determination 1 is performed, and if affirmative, step S1
The process proceeds to step 10 (shifts to the current priority state), and if denied, the process proceeds to step S105. After the lens driving 1 is performed in step S105, the process returns to step S102.

[Current Priority State] Focus detection 2 is performed in step S110, and tracking determination 1 is performed in subsequent step S111. If the result of the determination is affirmative, step S1
20 (shift to the tracking state), and if negative, the process proceeds to step S112. In step S112, tracking determination 2 is performed, and if the determination is affirmative, the process proceeds to step S120 (transition to tracking state). Note that the selective defocus amount dn = sn and the image plane velocity V (n-1) n = Vs (n-1) n. Also,
When step S112 is denied, step S113
The focus determination 2 is performed, and if affirmative, step S1
Returning to step 10, if negative, the process proceeds to step S114. In step S114, focus determination 3 is performed, and if affirmative, the process proceeds to step S115, and if negative, step S105.
Proceed to (shift to the closest state). Note that the selective defocus amount dn = rn. After driving the lens 1 in step S115, the process returns to step S110.

[Tracking state] In step S120,
The lens drive 2 is performed, and in the subsequent step S121, focus detection 3 is performed. In step S122, tracking determination 1 is performed,
If affirmative, the process returns to step S120, and if negative, the process proceeds to step S105 (shifts to the closest state). Selective defocus amount dn = rn. As described above, in the current priority state, even if a part of the focus detection area comes out of the background due to the tracking determination 2, the still movement determination of the subject can be reliably performed.

12 and 13 are flow charts showing other control program examples in the continuous mode. It differs from the continuous mode shown in FIG. 10 and FIG. 11 only in the tracking determination in the closest state and the current priority state. explain. Step S
In 103, tracking determination 3 is performed, and if affirmative, step S
Proceed to 120 (shift to tracking state). Note that the selective defocus amount dn = r'n and the image plane velocity V (n-1) n = Vr '.
(N-1) n. If step S103 is denied, the process proceeds to step S104. In step S111, tracking determination 3 is performed, and if affirmative, step S120
(Go to tracking state). Selection defocus amount dn =
p'n, image plane velocity V (n-1) n = Vp '(n-1) n
And If step S111 is denied, the process proceeds to step S112. In step S112, tracking determination 4 is performed, and if the determination is affirmative, the process proceeds to step S120 (shifts to the tracking state). The selective defocus amount dn = s'n and the image plane velocity V (n-1) n = Vs' (n-1) n. Moreover, when step S112 is denied, it progresses to step S113.

By changing the continuous mode as described above, the transition to the tracking state is always based only on the defocus amount of the focus detection area at the center of the screen, or these defocus amounts are prioritized. Will be done. That is, since the stationary movement determination is performed in a spot-like area at the center of the screen, it becomes easy to capture a moving subject. Even after shifting to the tracking state, the tracking determination may be performed only in the center of the screen by limiting the focus detection area to the center of the screen in the tracking determination 1 in step S122.

FIG. 9 is a state transition diagram in the single mode (with focus lock after focusing). The transition between each state will be described. A: Closest with half-press signal OFF, current priority, tracking state,
The focus shifts from the focus lock state to the non-operation state. The initial state when the power is turned on is a non-operating state. B: When the half-push signal is turned on, the non-operating state shifts to the closest state. C: When the tracking determination 1 is NO and the focus determination 1 is NO,
Lens drive 1 (normal drive) is performed to maintain the closest state. D: When the tracking determination 1 is NO and the focus determination 1 is YES, the lens is not driven, and the closest state is changed to the current priority state. E: If the tracking determination 1 is YES, the lens drive 2 (tracking drive) is performed to shift from the closest state to the tracking state. F: When the tracking determination 1 is NO, the tracking determination 2 is NO, and the focus determination 2 is YES, the photographing lens 3 is not driven and the current priority state is maintained. G: When the tracking determination 1 is NO, the tracking determination 2 is NO, the focus determination 2 is NO, and the focus determination 3 is YES, the lens drive 1 (normal drive) is performed to maintain the current priority state.

H: When the tracking determination 1 is NO, the tracking determination 2 is NO, the focusing determination 2 is NO, and the focusing determination 3 is NO, the selected defocus amount of this time is dn = pn to dn = Change to rn. Then, the lens drive 1 (normal drive) is performed to shift from the current priority state to the closest state. I: When the tracking determination 1 is YES or the tracking determination 2 is YES, when the tracking determination 2 is YES, the selected defocus amount dn = p at this time is selected so that the transition to the tracking state does not cause any trouble.
n to dn = sn, and image plane velocity V (n-1) n = Vp (n
-1) n is rewritten to V (n-1) n = Vs (n-1) n. Then, the lens drive 2 (tracking drive) is performed to shift from the current priority state to the tracking state. J: If the tracking determination 1 is YES, the lens drive 2 (tracking drive) is performed to maintain the tracking state. K: When the tracking determination 1 is NO, the current selected defocus amount dn = pn is changed to dn = rn. Then, the lens drive 1 (normal drive) is performed to shift from the tracking state to the closest state. N: When the tracking determination 2 is NO and the focus determination 4 is YES, the photographing lens 3 is not driven, and the focus priority lock state is shifted from the current priority state. P: When the tracking determination 1 is YES or the tracking determination 2 is YES, the current selected defocus amount dn = pn is set to dn = sn and the image surface velocity V (n is set so that the transition to the tracking state is not hindered. -1) n = Vp (n-1) n to V (n-1) n
= Vs (n-1) n. Then, the lens drive 2 (tracking drive) is performed to shift from the focus focus lock state to the tracking state. Q: When the tracking determination 1 is NO and the tracking determination 2 is NO,
The taking lens 3 is not driven, and the focus lock state is maintained.

14 and 15 are flowcharts showing an example of the focus adjustment control program in the single mode. In this operation, the focus determination and focus lock state in the current priority state are added to the operations in the continuous mode shown in FIGS. Steps that perform the same processing as in FIG. 10 and FIG. 11 will be assigned the same step numbers, and the description will focus on the differences. [Current Status Priority State] In step S113, focus determination 2 is performed. If affirmative, the process proceeds to step S116, and if negative, the process proceeds to step S114. In step S116, focus determination 4 is performed, and if affirmative, the process proceeds to step S130 (shifts to the focus lock state), and if negative, the process returns to step S110. [Focus Focus Lock State] Focus detection 2 is performed in step S130, and tracking determination 1 is performed in subsequent step S131. If affirmative, it will progress to step S120 (it will transfer to a tracking state), and if negative, it will progress to step S132. In step S132, tracking determination 2 is performed, and if the determination is affirmative, the process proceeds to step S120 (shifts to the tracking state).
Note that the selective defocus amount dn = sn, the image plane velocity V (n
-1) n = Vs (n-1) n. Also, step S
When 132 is denied, it returns to step S130.

As described above, the focus determination 4 in the current priority state shifts the focus to the focus lock state and prohibits the lens drive when the focus continues for several times. Does not require locking action. Further, even in the focus lock state, the still movement of the subject is detected, so that even if the still subject moves, it can be reliably detected, and the lens drive inhibition can be released and the lens drive can be restarted. it can.

16 and 17 are flowcharts showing another example of the control program in the single mode. Figure 1
4, only the operation in the focus mode is different from that in the single mode shown in FIG. 15, and the same step numbers are given to the steps performing the same processing, and the different points will be mainly described. [Current State Priority State] In step S116, focus determination 4 is performed, and if affirmative, the process proceeds to step S133 (shifts to the focus lock state), and if negative, step SS1.
Return to 10. [Focus Focus Lock State] In step S133, motion detection is performed. The AFCPU 1 performs this motion detection based on the output signal from the motion detection device 14. Judgment result,
When the taking lens 3 or the body is moving (with blurring), tracking determination is not performed and the process returns to step S133. If not, the process proceeds to step S130 to perform tracking determination. In step S132, tracking determination 2 is performed, and if the determination is affirmative, the process proceeds to step S120 (shifts to the tracking state). Selective defocus amount dn = sn, image plane velocity V (n-1) n =
Vs (n-1) n. Moreover, when step S132 is denied, it returns to step S133.

As described above, in the focus-locked state, as a result of the movement detection of the taking lens 3 or the body, the tracking determination is prohibited when it is moving, and the tracking determination is performed when it is not moving. , The distance relationship with the subject changes when the camera is panned, and the tracking action is not performed by erroneously determining that the subject is moving, and when the camera is still, the subject still remains stationary. It is possible to determine the movement. Even in the closest state, the current priority state, and the tracking state, tracking determination,
Motion detection may be performed before focus determination, and tracking determination or focus determination may be prohibited when the taking lens or the body is moving, and tracking determination or focus determination may be permitted only when the shooting lens or body is not moving. .. In this way, when the camera is panned, the distance relationship with the subject changes, and it is determined that the subject is moving by mistake, and tracking operation is performed,
The focus determination for unnecessary objects is eliminated, and when the camera is stationary, it is possible to reliably determine the stationary movement of the subject and the focus determination.

18 and 19 are flow charts showing other control program examples in the continuous mode. In this continuous mode,
0, the only difference is that the operation of setting the frame speed in the closest state and the tracking state is added to the continuous mode shown in FIG. 11, and the same step number is given to the step performing the same processing. The difference will be mainly described. [Non-operating state] In step S101, when the half-press signal is turned on, the process proceeds to step S106 (shifts to the closest state). [Closest state] In step S106, frame speed setting 1 is performed, and the flow advances to step S102. In the frame speed setting 1, the frame speed for a stationary subject during continuous shooting is set, and the set frame speed is sent from the AFCPU 1 to the main CPU 2 by the A signal. The main CPU 2, based on the sent piece speed,
When the continuous shooting mode is designated by the frame speed setting device 21, the frame speed when the full-press signal is input is controlled. Step S
At 105, the lens drive 1 is performed, and the process returns to step S106. In addition, steps S103, S111, S112, S
When the tracking determination in each state of 122 is affirmed, the process proceeds to step S123. [Tracking state] In step S123, frame speed setting 2 is performed,
It proceeds to step S120. In the frame speed setting 2, the frame speed (higher than the frame speed set in the frame speed setting 1) for the moving subject during continuous shooting is set, and the set frame speed is AFCP by the A signal.
It is sent from U1 to the main CPU2. Main CPU2
Controls the frame speed when a full-push signal is input when the continuous shooting mode is designated by the frame speed setting unit 21 based on the frame speed sent.

As described above, as a result of the determination of the stationary movement of the subject, the frame speed is automatically switched to a high frame speed when the object is moving. Therefore, it is not necessary for the photographer to manually switch the frame speed one by one. Sexuality improves. The frame speed for the stationary subject may be the frame speed set by the frame speed setter 21. Further, the frame speeds set in the frame speed settings 1 and 2 may be set in advance from the outside.

FIG. 20 is a flow chart showing a modification of the control program shown in FIGS. 18,
The frame speed setting operation in the tracking state is different from that in FIG. 19, and steps S200 and S2 are used instead of step S123 in the figure.
01 is added. Steps S103, S111, S1
When the tracking determination in each of the states 12 and S122 is affirmed, the process proceeds to step S200. [Tracking State] In step S200, distance detection is performed by the distance detection device 31, and information on the subject distance X corresponding to the current position of the taking lens 3 is fetched. Continuing step S2
At 01, the frame speed setting 3 is performed. In the frame speed setting 3, the frame speed Y for the moving object during continuous shooting is set based on the object distance X, and the set frame speed is sent from the AFCPU 1 to the main CPU 2 by the A signal. The main CPU 2 controls the frame speed when the full-press signal is input when the continuous shooting mode is designated by the frame speed setting device 21 based on the frame speed sent. The relationship between the subject distance X and the frame speed Y is set so that when the subject distance is short, it is higher than when it is far. Example 1; Y = Y1 if X> Xk, Y = Y2 if X≤Xk, where Xk is a predetermined distance, Y1 and Y2 are predetermined frame speeds, Y1
<Y2. Example 2; Y = Kx / X Here, Kx is a predetermined value.

Thus, when the subject is moving,
Since the frame speed is automatically switched according to the subject distance, the photographer does not need to manually switch the frame speed, which improves the operability. In addition, in Examples 1 and 2 above, the predetermined distance Xk, the frame speeds Y1, Y2, and the predetermined value Kx may be set in advance from the outside.

FIG. 21 is a flow chart showing a modification of the control program shown in FIGS. 18 and 19. 18,
Instead of step S123 in FIG. 19, the following step S2
00, S202, S203, S204 are added. When the tracking determination in each state of steps S103, S111, S112, and S122 is affirmed, step S20
Go to 0. [Tracking State] In step S200, distance detection is performed, and information on the subject distance X corresponding to the current position of the taking lens 3 is fetched from the distance detection device 31. Continued Step S202
Then, the focal length is detected, and the information on the current focal length Z of the taking lens 3 is fetched from the focal length detecting device 32. In step S203, the current magnification W of the taking lens 3 is calculated based on the subject distance X and the focal length Z. W = Z / X (19) In step S204, frame speed setting 4 is performed. In the frame speed setting 4, the frame speed Y for the moving subject at the time of continuous shooting is set based on the shooting magnification W, and the set frame speed is AFed by the A signal.
It is sent from the CPU 1 to the main CPU 2. Main CPU
2 controls the frame speed when a full-press signal is input when the frame speed setting unit 21 specifies the continuous shooting mode based on the frame speed sent. The relationship between the shooting magnification W and the frame speed Y is
When the magnification is high, it is set to be faster than when the magnification is low. Example 1; Y = Y3 if W> Wk, Y = Y4 if W ≦ Wk, where Wk is a predetermined magnification, Y3 and Y4 are predetermined frame speeds, Y4
<Y3. Example 2; Y = Kw / W Here, Kw is a predetermined value.

As described above, when the subject is moving, the frame speed is automatically switched according to the photographing magnification, so that the photographer does not have to manually switch the frame speed one by one and the operability is improved. .. In the above examples 1 and 2, the predetermined distance Wk, the frame speeds Y3 and Y4, and the predetermined value Kw may be set in advance from the outside.

22 and 23 are flow charts showing another example of the control program in the continuous mode. Only the operations in the continuous mode and the tracking state shown in FIGS. 10 and 11 are different, and the steps performing the same processing are denoted by the same step numbers, and the difference will be mainly described. Steps S103, S111, S11
If the tracking determination in each state of S2 and S122 is affirmed, the process proceeds to step S200. [Tracking State] In step S200, distance detection is performed, and information on the subject distance X corresponding to the current position of the taking lens 3 is fetched from the distance detection device 31. In subsequent S202, focal length detection is performed, and information on the current focal length Z of the taking lens 3 is fetched from the focal length detection device 32. Step S2
At 05, speed detection is performed. First, the current magnification W of the taking lens 3 is calculated based on the subject distance X and the focal length Z. W = Z / X (20) Next, the object velocity S is calculated using the image plane velocity V (n-1) n when it is determined to be moving in the latest tracking determination. S = V (n−1) n / W ² (21) In step S206, time prediction 1 is performed. The time T1 to reach the distance Xm from the present time is predicted from the distance Xm set by the distance setting described later, the current subject distance X, and the subject speed S. T1 = (X−Xm) / S (22) The time T1 may be determined in consideration of the time lag Tr from the start of exposure to the actual start of exposure. T1 = (X−Xm) / S−Tr (23) The time T1 predicted by the time prediction 1 in step S207.
Set to the timer and start.

FIG. 24 is a flow chart showing the interruption operation of the distance setting. In step S300, interrupt 1 is activated. Interrupt 1 is generated by the setting operation of the distance setter 11. In subsequent step S301, the distance is set and the distance Xm set by the distance setter 11 is read. In step S302, the process returns from interrupt 1.

FIG. 25 is a flow chart showing the interrupt operation of the timer. In step S400, interrupt 2 is activated. The interrupt 2 is generated at the end of the time counting of the time set in the timer. Continued Step S401
Then, activate the exposure control. In the exposure control activation, the information of the exposure control activation request is sent from the AFCPU 1 to the main CPU 2 by the A signal. The main CPU 2 starts the exposure control based on the information of the exposure control activation request sent. In step S402, interrupt 2 is returned.

Thus, when the subject is moving,
Since the exposure is performed when the subject reaches a preset distance, the photographer does not need to manually release the subject depending on his intuition, and the moving subject can be accurately photographed at a desired distance.

26 and 27 are flow charts showing modified examples of the control programs shown in FIGS.
22 to 24, only the operation in the tracking state and the magnification setting operation are different, and only different parts will be described. Figure 2
6 is an operation in the tracking state. Time prediction 2 is performed instead of time prediction 1. In step S205 of FIG. 23, speed detection is performed. First, the current magnification W of the taking lens 3 is calculated based on the subject distance X and the focal length Z. W = Z / X (24) Next, the object velocity S is calculated using the image plane velocity V (n-1) n when it is determined to be moving in the latest tracking determination. In S = V (n-1) n / W 2 ··· (25) Step S208, performs the temporal prediction 2. Based on the magnification Wm set by the magnification setting to be described later and the current focal length Z, the subject distance Xw when the magnification becomes Wm is obtained. Xw = Z / Wm (26) Then, the time T1 to reach the distance Xm from the present time is predicted from the object distance Xw, the current object distance X, and the object speed S. T1 = (X−Xw) / S (27) Note that the time T1 may be determined in consideration of the time lag Tr from the start of exposure to the actual start of exposure. T1 = (X−Xw) / S−Tr (28) The time T2 predicted by the time prediction 2 in step S207.
Set to the timer and start.

FIG. 27 is a flowchart showing the interruption operation for setting the magnification. In step S500, interrupt 3 is activated. Interrupt 3 is generated by the setting operation of the magnification setting device 12. In step S501, magnification is set and the magnification Wm set by the magnification setter 12 is read. In step S502, interrupt 3 is returned. In this way, when the subject is moving, the exposure is performed when the subject reaches a preset magnification, so that the photographer does not need to rely on his intuition to release the image, and the operability is accurate. Is improved. Note that FIG.
In the embodiments of FIGS. 23 and 26, the time lag Tr may be set in advance from the outside. Further, continuous shooting may be performed after the exposure control is once activated.

In the configuration of the above embodiment, the AF sensor 13 and the AFCPU 1 serve as the focus detection means and the motor 15
Is the lens driving means, the distance detecting device 31 is the distance detecting means, the focal length detecting device 32 is the focal length detecting means, the distance setting device 11 is the distance setting device, the magnification setting device 12 is the magnification setting device, and the main CPU 2 Exposure control means AFCP
U1 constitutes a stationary movement judging means, a calculating means, a speed calculating means, a time predicting means and a starting means, respectively.

[0062]

As described above, according to the first aspect of the present invention, the exposure is performed when the moving object reaches the preset shooting distance, so that the moving object can be accurately captured at the desired shooting distance. Can be taken to. Further, according to the second aspect of the invention, since the exposure is performed when the moving subject reaches the position of the preset photographing magnification, the moving subject can be accurately photographed at a desired photographing magnification. .. Further, according to the third aspect of the invention, the exposure operation is started when the moving object reaches the preset shooting distance or the position of the shooting magnification, and the continuous shooting is performed thereafter, so that the desired shooting is performed. Continuous shooting can be performed from a distance or a shooting magnification.

[Brief description of drawings]

FIG. 1 is a diagram for responding to a complaint.

FIG. 2 is a diagram for responding to a complaint.

FIG. 3 is a block diagram showing the configuration of an embodiment.

FIG. 4 is a diagram showing a configuration example of an AF sensor.

FIG. 5 is a diagram showing an example of setting a focus detection area in a shooting screen.

FIG. 6 is a diagram showing another example of setting of a focus detection area in a shooting screen.

FIG. 7 is a diagram showing a movement of an ideal image plane of a moving subject and a movement of an image forming plane of the photographing lens when the photographing lens is driven to track the moving subject.

FIG. 8 is a diagram showing a transition of operating states in continuous mode.

FIG. 9 is a diagram showing transition of operating states in single mode.

FIG. 10 is a flowchart showing an example of a focus adjustment control program in a continuous mode.

FIG. 11 is a flowchart showing an example of a focus adjustment control program in a continuous mode.

FIG. 12 is a flowchart showing another example of a focus adjustment control program in the continuous mode.

FIG. 13 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 14 is a flowchart showing an example of a focus adjustment control program in a single mode.

FIG. 15 is a flowchart showing an example of a focus adjustment control program in a single mode.

FIG. 16 is a flowchart showing another focus adjustment control program example in the single mode.

FIG. 17 is a flowchart showing another focus adjustment control program example in the single mode.

FIG. 18 is a flowchart showing another focus adjustment control program example in a continuous mode.

FIG. 19 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 20 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 21 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 22 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 23 is a flowchart showing another example of a focus adjustment control program in a continuous mode.

FIG. 24 is a flowchart showing a distance setting interrupt program.

FIG. 25 is a flowchart showing a timer interrupt program.

FIG. 26 is a flowchart showing another focus adjustment control program example in the continuous mode.

FIG. 27 is a flowchart showing another focus adjustment control program example in the continuous mode.

[Explanation of symbols]

 1 AFCPU 2 Main CPU 3 Photographic lens 11 Distance setting device 12 Magnification setting device 13 AF sensor 14 Motion detection device 15 Motor 20 Release button 21 Frame speed setting device 22 Shutter mechanism unit 23 Winding device 24 Shutter charge mechanism unit 25 Mirror mechanism unit 31 Distance detecting device 32 Focal length detecting device 33 Aperture mechanism section 101, 201 Shooting lens 102, 202 Focus detecting means 103, 203 Static movement determining means 104, 204 Computing means 105, 205 Lens driving means 106, 206 Distance detecting means 107, 207 Focal length detecting means 108, 208 Speed calculating means 109 Distance setting means 110, 210 Time predicting means 111, 111A, 211, 211A Exposure control means 112, 212 Starting means 209 Magnification setting means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 5/232 H 9187-5C

Claims (1)

Claim: What is claimed is: 1. A photographic lens, a focus detecting means for detecting a defocus amount of the photographic lens at a certain detection time interval, and latest and past multiple times of defocus detected by this focus detecting means. Based on the focus amount, stationary movement determination means for determining whether the subject is still or moving, and when the stationary movement determination means determines that the subject is stationary, the latest movement detected by the focus detection means Based on the defocus amount, a lens drive amount for focusing the photographing lens on the subject is calculated, and when the stationary movement determination unit determines that the subject is moving, the focus detection unit The lens drive amount for tracking the photographing lens on the subject is calculated based on the latest and past multiple defocus amounts detected by A computing means, a lens driving means for driving the photographing lens according to the lens driving amount calculated by the computing means, a distance detecting means for detecting a photographing distance to the subject, and a focal length of the photographing lens. Focal length detection means, latest and past defocus amounts detected by the focus detection means and detection time intervals thereof, shooting distance at the time of defocus amount detection detected by the distance detection means, and Based on the focal length at the time of detecting the defocus amount detected by the focal length detecting unit, a speed calculating unit that calculates the moving speed of the subject, a distance setting unit that sets a desired shooting distance, and the stationary movement determination. When it is determined by the means that the subject is moving, the photographing distance detected by the distance detecting means and the speed Based on the moving speed calculated by the calculating means, a time predicting means for predicting a required time from the present time until the subject reaches the position of the photographing distance set in the distance setting means, and an exposure controlling the exposure operation. Control means and start means for starting the exposure operation of the exposure control means when the predicted time by the time predicting means and the release delay time from the shutter release time to the actual exposure time become equal. And an autofocus camera. 2. A photographing lens, focus detection means for detecting a defocus amount of the photographing lens at a certain detection time interval, and latest and past plural defocus amounts detected by the focus detection means, A stationary movement determination means for determining whether the subject is stationary or not, and when the stationary movement determination means determines that the subject is stationary, based on the latest defocus amount detected by the focus detection means. When the lens drive amount for focusing the photographing lens on the subject is calculated, and the subject is determined to be moving by the stationary movement determination means, the latest and the latest detected by the focus detection means are detected. A calculation means for calculating a lens drive amount for tracking the photographing lens on the subject based on a plurality of defocus amounts in the past, and this performance. Lens driving means for driving the photographing lens according to the lens driving amount calculated by means, distance detecting means for detecting a photographing distance to the subject, and focal length detecting means for detecting a focal length of the photographing lens. , Latest and past defocus amounts detected by the focus detection unit and detection time intervals thereof, shooting distance at the time of detecting the defocus amount detected by the distance detection unit, and detection by the focal length detection unit Based on the focal length at the time of detecting the defocus amount, a speed calculation unit that calculates the moving speed of the subject, a magnification setting unit that sets a desired magnification, and the stationary movement determination unit move the subject. When it is determined that the shooting distance detected by the distance detecting means and the speed calculating means are calculated. The moving speed, the time predicting unit predicting a required time from the present time until the subject reaches the position of the magnification set in the magnification setting unit, the exposure control unit controlling the exposure operation, Automatic focus adjustment, characterized in that it comprises start-up means for starting the exposure operation of the exposure control means when the time predicted by the time predicting means and the release delay time from the shutter release time to the actual exposure time become equal. camera. 3. The automatic focusing camera according to claim 1, wherein the exposure control means continuously performs the exposure operation after being activated by the activation means. Adjustable camera.