JPH0766103B2 - Optical device - Google Patents

Description

Detailed Description of the Invention [0001] TECHNICAL FIELD The present invention is used in optical devices such as cameras.
The present invention relates to a device for detecting movement of an object. [0002] BACKGROUND OF THE INVENTION As an automatic focus detection device such as a camera,
Of the actual focal point and the planned focal plane of the object lens (imaging optical system)
The defocus amount corresponding to the amount of deviation from the image plane is set for a certain time
The objective lens is calculated according to this defocus signal.
It is known to drive a camera to perform automatic focus adjustment.
However, there is a means to detect such defocus amount.
Use the subject (target object) to move in the optical axis direction.
No suggestions have been made in the past to try to detect
Yes. Therefore, the movement of the target object is detected and the detection signal is detected.
I had no idea to try. The present invention is applicable to the case where the target object is moving.
The optical axis of the imaging optical system (photographing lens) of the target object
The purpose is to detect movement in the direction. [0004] EXAMPLES The contents of the present invention will be described below based on specific examples.
And explain. FIG. 1 shows a configuration in which the present invention is applied to a camera.
It is a block diagram shown. In the figure, the taking lens 101
The focus detection means 104 for detecting the focus adjustment state of FIG.
Like the focus detection optical means 201 and the photoelectric conversion means 20.
2. Consists of focus detection calculation means 203. Photoelectric conversion
The conversion unit 202 is a taking lens 101 and an optical unit for focus detection.
201 receives the subject image formed by
Generates the corresponding image output. This photoelectric conversion means 202 is a charge storage type light.
The device has an electric conversion unit and the device determines the charge accumulation time.
Therefore, the photoelectric conversion unit itself may have such a function.
The image output can be performed by the focus detection calculation unit 203.
It may be determined by processing. In any case
The point detection unit 104 determines the timing of starting and ending the charge accumulation.
Is transmitted to the control means 109. From the end of charge accumulation to the start of the next charge accumulation
Is used for charge transfer and defocus amount calculation.
It The defocus amount is calculated by a known method.
Is also transmitted to the control means 109. The time counting means 108
From the control means 109, the timing of the start and end of the charge accumulation
Timing or other timing, each timing
Of the time intervals, and the result is controlled by the control means 109.
It is stored in the memory 110. In FIG. 3, the horizontal axis represents time t and the vertical axis represents the time.
The moving position χ of the circle 101 is taken, and the solid lines 301 and 3
01 'represents the movement trajectory of the lens 101, and the thick solid line 3
02 is when the object moves in the optical axis direction of the imaging lens 101
It corresponds to the object's movement trajectory, and if the object is stationary
If it is, it will be parallel to the time axis, and when there is the above movement
It has a certain slope as shown. The movement detecting means of the present invention uses this object movement locus.
It is to detect whether or not 302 is parallel to the time axis.
In addition, the image plane moving speed corresponding to the object moving speed from the inclination
Is to detect. Movement locus 30 of lens 101
1, 301 'represents the movement of the image plane position based on the movement of the object.
If the object movement locus 302 is substantially the same,
No. 101 is in focus. Lens movement locus 30
Point 1 at which 1 is greatly deviated from the object movement locus 302₀From up
First match point Q₁Driving of the imaging lens 101 up to
Is referred to as convergent drive, and the point Q
₁Imaging lens so as to follow the object movement trajectory 302 from
Driving the drive will be referred to as follow-up drive. Time t_n-1, T_n, T_{n + 1}, T_{n + 2}Is the light
The time at which the charge accumulation of the electric conversion means 202 is started is shown as
Tick t '_n-1, T '_n, T '_{n + 1}Is the end of the above charge accumulation
Time point, t '_nIs the point at which convergence drive changes to follow-up drive
Indicates. T_n-1, T_nRepresents the charge storage time, T_n ^c
_-1, T_n ^cIs the calculation time, during which the photoelectric conversion means
Based on the data from 202, focus detection calculation control means 2
03 calculates the defocus amount,
Details will be described later based on the information stored in the memory 110.
Estimated defocus amount X to be described_n-1, X_nAnd the target object
Correction amount δ that corrects the estimated defocus amount with movement_n-1
(Τ), δ_n(Τ) are calculated respectively. This estimated defocus amount is calculated at time t._n-1, T
_n, T_{n + 1}, T_{n + 2}Defocus amount counting means 1
It is set to 06. T ’_nIs time t '_nFrom time t ′
_nRepresents the time until_n-1, M_nEach time
T_n-1, T_nThe amount of movement of the lens 101 during
Including, for example, M_nIs at time t_nLens 101 at
Position and time t ′_nThe distance from the position of the lens 101 at
It is the amount including the direction. Therefore, when the lens 101 moves in a certain direction
M when moving in the opposite direction_n-1And M_nThe sign of
It M_n ^c _-1, M_n ^cEach is T_n ^c _-1, T_n ^cBetween
The amount of movement of the lens 101 is shown including the direction.
In this embodiment, the image plane position at a predetermined timing is calculated.
Therefore, based on this, the movement of the image plane due to the movement of the object
The lens 101 is corrected and then driven. versus
How to calculate the amount of movement of an elephant object (subject)
As will be described later, correction of image plane movement due to movement of object
The quantity is represented by δ (τ) as a function of time τ. Further, the estimated defocus amount is as described above.
However, the photoelectric conversion has already been completed at this time.
Since the time has passed since the conversion,
(For example, the predetermined timing is as described below.
(The center of the charge accumulation time) above for the image plane position
The movement of the image plane position due to the movement of the object during
It is a corrected amount (the calculation method will be described later). In this way, the estimated defocus amount itself is
Although it is the measured amount,
From the end of calculation by adding δ (τ) above
Predicting quantities related to image plane position after τ has elapsed
You can In FIG. 3, the estimated defocus amount X_n-1
Is set in the defocus amount counting means 106 at time t
_n-1, The position Q of the lens 101 at that time₀From
Estimated defocus amount X_n-1Q points away₂And
This point Q₂Is the timing t at the end of calculation_n-1Forecast in
The image plane position has been changed. This point Q₂Move object from
A correction straight line 310 (shown by a broken line) is substantially parallel to the locus 302.
is there. ), Point Q₂And the horizontal line from
Each time t with line 310_n-1The distance at + τ is the correction amount δ
_n-1Represents (τ). Correction amount δ_nThe same is true for (τ)
At time t_nLens position Q at₂And the recommendation at this time
Constant defocus amount X_nAnd from time t_nAt the timing of
Point Q as the predicted image plane position_FourIs determined, this
Point Q_FourTo the object movement locus 302 from the correction line 3
11 is drawn. Referring again to FIG. 1, the control means 109
Time point t_n-1The correction amount at + τ is
δ_n-1Δ so that (τ)_n-1Frequency according to (τ)
Defocus amount counting means 10
Estimate Defocuser to track the movement of the subject.
Correct the value of the scan amount. In this way, the defocus amount counting means 1
In 06, the estimated data at each moment in consideration of the motion of the subject is also included.
The focus amount is held, and the drive signal generating means is 1
05 responds to the contents of the defocus amount counting means 106,
Husband, depending on whether its content is positive, negative, or zero
The motor for driving the lens 101 is rotated forward, reverse, and stopped.
Generate a signal that Driving means 102 including the above driving motor
Receives this signal and drives the lens 101. Amount of movement
The signal generating means 103 generates a pulse as the lens 101 moves.
To occur. As a method thereof, Japanese Patent Laid-Open No. 58-8871
Independent means may be provided as described in item 0 above.
If the drive motor is a pulse motor, the drive pulse
It is also possible to use. The signal pulse relating to this lens movement amount is transferred.
It is counted by the motion amount counting means 107, and the count value is the electric charge.
Start of accumulation t_n-1And end t_n-1According to the timing of
After being read, it is reset to zero. in this way
Then, the moving amount counting means 107 is used to
Distance M_n-1, M_n ^c _-1Is detected and the memory 110
Memorized in. Driving the lens by the drive signal generating means 105
The movement is based on the contents of the defocus amount counting means 106.
Go to the direction in which the content of the focus amount counting means 106 becomes zero.
Therefore, the defocus amount counting means 106 is
The movement of the lens from the input movement amount signal generating means 103
The signal pulse related to motion
The estimated defocus amount in the stage 106 shifts toward zero.
Counted up or down. In this way, the defocus amount counting means 1
The estimated defocus amount held by 06 is associated with the movement of the lens.
Gradually decreases and approaches zero, and the system approaches the in-focus state.
Ku. In the case of FIG._n-1→ t_nIn the meantime, such a convergence drive
The movement continues. However, the charge accumulation time T_n-1Equivalent to
It is preferable that the lens is moving at a uniform speed during the period
But the transfer / computation time T_n-1 ^CThe period is not always constant
You don't have to be running in. For example, stop during charge transfer time
It doesn't matter even if you do. Next, time t_nThe next cycle starting from
explain about. Time t_nAt time T_n-1Received by
The defocus amount is the period T based on the obtained data._n-1 ^C
Has already been calculated by the focus detection means 104.
This defocus amount and the contents stored in the memory 110
By using the new estimated defocus amount X_nAnd the correction amount δ _n
(Τ) is calculated. This calculated time t_nAt the time of this new
Estimated defocus amount X_nIs the defocus amount counting means 1
The charge of the photoelectric conversion means 202 at the same time when it is set to 06.
The accumulation is restarted. Δ over time_nTo (τ)
The correction of the estimated defocus amount based on
It is a solid street. The lens is driven at time t ''_nUp to last time
Similar convergence drive is performed. Time t '' _nThen in focus
Therefore, the estimated default value in the defocus amount counting means 106 is
The amount of circus is just equal to zero. As a result, the drive signal
The live means 106 sends a signal to the driving means 102 to stop the driving.
Then, the lens 101 stops. In this stopped state,
Since the motion amount signal is not generated, the defocus amount counting means 1
The estimated defocus amount held by 06 also stops at zero for a short time.
Maru However, the control means 109 controls the movement of the subject.
Correction amount δ_nSubject at frequency according to (τ)
A movement correction pulse is being generated. This pulse is δ
_nThe defocus amount counting means 106 according to the sign of (τ).
Is counted up or down. Therefore,
The estimated deformation, which is the contents of the focus amount counting means 106
The amount of waste is not zero. As a result, the drive signal generating means
A lens drive signal is generated from 105, the lens moves, and
And a defocus amount counting means 10 is generated.
The estimated defocus amount of 6 becomes zero again. After a while, the subject is focused as the subject moves.
If the condition is about to collapse, the subject movement correction pulse
And the same thing occurs at least at the end of charge accumulation t ′.
_nCan be continued until. Of course time t_{n + 1}Can continue until
Good. During this period, as shown in FIG.
Quantity δ_nSince the lens is driven along (τ),
It will be a period of movement. Even during this follow-up drive, the lens has a correction amount δ.
_nMove along the straight line 311 indicated by the broken line representing (τ)
Since it will be done, minute driving and stopping may be included many times.
However, on average, they are moving at a uniform speed
Even if the subject moves based on the prediction calculation,
The lens is properly focused. Next, using FIG.
Estimated defocus amount and correction amount δ_nHow to calculate (τ)
Will be described in detail. FIG. 4 is an enlarged view of a part of FIG.
is there. T_n-1The lens drive speed during the accumulation time as in
When the degree is constant, it becomes a little simpler, but in Fig. 4 it is the most
In complex cases, i.e. the lens drive speed changes during the integration time.
If there is an error that is unavoidable,
It is the one to be analyzed. Time t_nFrom the data up to time t_nOke
Estimated defocus amount X_nAnd reflecting the movement of the subject
Correction amount δ that changes with time_n(Τ) is as shown in the figure.
Here, the estimated defocus amount X_nIs completely correct, X_n
The tip of should be above the thick solid line 302,
Generally, the error Δ is included, and the result is as shown in the figure. This error Δ
Generally means that the imaging lens 101 is far away from the in-focus position.
It is relatively large when
Becomes smaller. In the state of FIG. 4, the lens 101 is in the in-focus position.
Since it is very close to
Point Q of trajectory 301₁Lens 101 is substantially
It is a very small value that can be considered to be in a focal state
It The locus of movement of the lens 101 is shown by the solid line 301.
Special estimated defocus amount X_nAnd the correction amount δ_nDetermined from (τ)
Point Q which advances toward the dashed line 310 of the estimated trajectory (convergence drive)
₁After matching with, the robot moves along the estimated trajectory (following drive). Furthermore, in FIG._n, M '_n, M_{n + 1}Is at time t_n,
t ’_n, T_{n + 1}The position of the lens 101 in FIG.
Also, X_nTip Q of_FourAnd charge accumulation in thick solid line 302
Midpoint of time (t_n+ T_n/ 2, χ_n) Is a straight line l
Product end time t ' _nFrom the point of intersection with the time axis of_nFor up to
The size including the direction is X '_nAnd this midpoint
Coordinate χ_nTo m_{n + 1}The size including the direction up to
Like Z _{n + 1}And Thus, in this embodiment, the predetermined timing
(T_n+ T_nImage plane position at (/ 2) (χ_n) Represents
At another predetermined timing (at the end of calculation)
Position (m_{n + 1}) Amount Z_{n + 1}Is used.
That is, Z_{n + 1}= Χ_n-M_{n + 1}. Of course, another timing
Even if it is calculated as the amount measured from the lens position of the lens
Good. If the situation in charge storage time is like this
From the image output at this time, the focus detection means 104
The defocus amount calculated by P_{n + 1}And the following
I have a relationship. [0028] [Equation 1] Incidentally, P_{n + 1}Is the output of the focus detection calculation means 203
As power, T ’_n, T_nIs the output of the time counting means 108
And then M_n ^c, M_nIs the output of the movement amount counting means 107
X_nAre respectively obtained as the previous calculation results, and these are
It is stored in the memory 110. Here, the prediction calculation process
To summarize the concept of the theory, first, focus detection means as described above
Therefore, the calculated defocus amount and stored in the memory
Based on the contents of the
Determine the amount related to the image plane position at the midpoint of the product time).
Then the charge accumulation time T_nAnd the subsequent calculation time T_n ^cWhen
A plurality of the predetermined timings in the repetition cycle of
The amount of image plane position at
The image plane position at a (future) time point after the
Predict how much you will do. The driving means is the predicted image plane position.
The lens is driven with respect to. In this embodiment, a plurality of the above
Image plane position at given timing and given time between them
The image plane shift corresponding to the inclination k of the object movement trajectory based on the interval and
Determine the moving speed, and the image plane that accompanies the movement of the subject during the predetermined time τ
Movement correction amount δ_{n + 1}(Τ) is calculated to determine the future image plane position.
You are predicting how much you will do. This point will be described below. Subject
Correction amount due to body movement δ_{n + 1}How to calculate (τ)
Various methods are possible. For example, the last estimated defoe
Connect the amount of dregs and the position that indicates the estimated defocus amount this time.
You may ask for this. However, in this case, the error Δ at each time is multiplied by
It has the drawback of being calculated. Figure 5 is the same as Figure 3
It shows only the parts that are clearly needed. Correction amount
δ_{n + 1}To obtain (τ), charge accumulation time of past multiple times
T_n-1, T_nCoordinate χ on the thick solid line in the center of_n, Χ
_n-1, Χ_n-2It is better to use .... That is, the specified timing
It is better to use the midpoint of the charge storage time as the trigger. This place
As shown in FIG. 5, dT_nAnd then the charge
Fig. 5 shows the time from the midpoint of the accumulation time to the end of calculation
Like ΔT_nAnd these are respectively dT_n= T_n ^c _-1+ (T_n-1+ T_n) / 2, ΔT_n= T
_n ^c+ T_n/ 2 The movement detection means first finds the time axis of the object movement locus 302.
The amount of image plane movement as the amount of deviation from parallel
Then, the image plane position χ at the first predetermined timing_nAnd that
Image plane position χ at the second predetermined timing before_n-1When
Calculate the difference between. Image plane movement amount χ thus obtained_n−
χ_n-1Between the first predetermined timing and the second predetermined timing
Time interval dT_nIf you divide by,
Slope k_{n + 1}Can be calculated. Furthermore, k_{n + 1}= (Χ_n−χ
_n-1) / DT_nThan [0031] [Equation 2] Thus, the image plane at the time interval
The movement amount is the first amount Z, which is a calculated amount._{n + 1}, First
2 quantity Z_n, The third quantity (M_n+ M_n ^c) And from (first
Amount-second amount + third amount). these
The meaning of quantity is as follows. First
Quantity Z_{n + 1}Is the first lens position m_{n + 1}Measured based on
1 predetermined timing (t_n+ T_n/ 2) image plane position
Storage χ_nIt is a quantity related to the distance to. The second quantity Z_n
Is the second lens position m_nSecond predetermined value measured based on
Imming (t_n-1+ T_n-1Image plane position χ
_n-1It is a quantity related to the distance to. The third quantity (M_n
+ M_n ^c) Is from the second lens position to the first lens position
Is a quantity related to the movement of the image plane due to the movement of the lens to
In FIG. 4, the second lens position m_nTo the first lens position
Setting m_{n + 1}It is a quantity related to the distance to. In this example
The image plane position at the first predetermined timing is the lens position m
_{n + 1}The first lens position, which was measured from
Other methods may be used for the second lens position.
The same applies to the case. The third amount in that case is how to take it
From the second lens position to the first lens position in
It is calculated as a quantity related to the movement of the image plane due to the movement of the lens.
It In addition, as described above, to calculate the movement of the subject
There are various ways that you can do it
Even with the method of comparing the position indicated by the estimated defocus amount
good. In this case, the calculation ends at the first and second predetermined timings.
Corresponding to the time point. The specified Thailand obtained in this way
Amount Z related to the image plane position in the zooming_{n + 1}And image plane movement
Speed k_{n + 1}Use and to select (future
It is possible to predict the quantity related to the image plane position at
it can. For example, regarding the image plane position at the end of calculation
The estimated defocus amount, which is the predicted amount of_{n + 1}Given by
Of the image plane movement after τ
The correction amount is_{n + 1}It is given by (τ). [0033] [Equation 3] It becomes The subject may be stationary
If the subject cannot be determined, the subject is stationary for the time being
As time t_{n + 1}Defocus amount X at_{n + 1},
Correction amount δ_{n + 1}(Τ) is determined as follows. [0035] [Equation 4] The slope k is the slope k of the past several times._n, K
_n-1, K_{n + 2}It may be obtained by weighted averaging ..., Past 3
Coordinates of the image plane position more than once_n, Χ_n-1, Χ_n-2From ...
Also find a curve of suitable degree, eg a quadratic curve,
Next tilt k_{n + 1}May be interpolated. Also, in this way
K_{n + 1}Αk using the constant 1> α> 0 for_{n + 1}of
The inclination may be followed. In the control means 109, the lens is the broken line 3 in FIG.
Defocus amount counting so that it is driven following 11
The slope k with respect to the means 106_{n + 1}At a time interval determined by
Send a pulse. Specifically, the image plane moving speed | k_{n + 1}｜
Is larger, then pulses with smaller time intervals are emitted.
However, if the movement of the lens follows the broken line 311 in FIG.
It is good to send a pulse ahead of time so that
Yes. In the above description, the focus is detected because it is simple.
Keeping in mind the case where all groups are fixed and moved as the lens 101
However, even when moving only one group to focus
Consider an equivalent single lens as a whole group, and move the single lens
Is treated as corresponding to the movement of the lens 101.
Becomes Further, blocks 105, 106 and 10 in FIG.
7, 108, 109, 110 and block 203 of FIG.
All or part of it by a microcomputer
Can be configured. The movement detecting means of the present invention
In the embodiment, the configuration of No. 105-110 of FIG.
Part or all of each block corresponds. Next, a flow chart showing the overall time flow
Will be explained. In FIG. 6, step 1 operation starts (STA
After RT), the two types of interrupts described below are disabled in step 2.
And set the parameter Vint to zero. In step 3
Estimated defocus amount X_oX corresponding to_pAnd the correction amount δ
₀Pulse interval T that determines (τ)_pDecide. At first Ren
Since the focus is detected without moving the camera, X_p= 0, T_p= 0
To do. However, T_pThe value of is the subject when it is nonzero
The control means 109 measures the body movement correction pulse by the defocus amount meter.
The pulse interval sent to the number means 106 is shown, but T_p=
0 means no pulse is generated. Further, the defocus amount counting means 106 is T_p
> 0 and T_pThe count content is received by the pulse received corresponding to <0.
Upcount and downcount respectively
To do. In step 4, the contents of the movement amount counting means 107 are set to zero.
To prepare for counting. Defocus amount in step 5
X on the counter of the counting means 106_pSet the value of.
X_pX when ≠ 0_pDrive signal is generated according to the polarity of the
The live means 105 moves the lens 101 through the driving means 102.
Move forward or backward. In the present case, X_p= 0, so lens 101 is still
It has stopped. In step 6, the object movement correction pulse
Therefore, T is displayed on the counter of the control means 109._pThe value of
It This counter is down counting at a predetermined speed
When the content of the counter becomes zero, the control means 109
1 pulse is sent from the defocus amount counting means 106
It The contents of the counter are T_pThe value of
Be done. In this way, the time interval T_pA pulse is generated every
To do. Furthermore T_pDepending on the polarity of the
The defocus amount counting means 106 also gives an instruction as to whether to count down.
Be transmitted to. Repeat like this on the counter
T_pIs set, but the lens movement is δ_n(Τ)
The first pulse is T so as not to follow the straight line_p
It may be generated at a shorter appropriate time. For example, the first time set on the counter
Value of 0.5T_pAnd Where T_pThe value of is k in Equation 5
_nAgainst T_p= Q / k_nAnd q is the counter
Of the discount speed and the movement amount signal generating means 103
Generates one pulse for any movement of lens 101
It is a constant determined by whether or not to do. Then step
At 7, the counter of the time counting means 108 is set to zero and the counter is counted.
Start the charge accumulation at step 8 at the same time
It Then, in steps 9 and 10, speed change interrupt and charge storage
Allows product end interrupts. The system is T in FIG._nFor the times
Time t '_nCauses a speed change interrupt. Therefore speed
The change interrupt is, for example, the defocus amount counting means 106.
Emitted when the content of changes from non-zero to zero. to this
Then jump to the speed change interrupt generation routine of FIG. Then
In step 12, disable the subsequent speed change interrupt and
Then, the contents of the counter of the time counting means 108 are set to T ′.
_nRemember. Next, it indicates that a speed change interrupt has occurred.
RETURN is performed by setting the parameter Vint to 1.
After that, an interruption for ending the charge accumulation occurs and the process moves to FIG. Well
First, disable the speed change interrupt in step 17,
At 18, the contents of the counter of the time counting means 108 are set to T_nTo
Remember. This value corresponds to the charge accumulation time. Then this
The counter of is set to zero. When there is a speed change interrupt, T'of FIG.
_nThe amount corresponding to
It is necessary to calculate the time to complete
This is done on pages 19, 20, and 22. Step 21 moves
The contents of the quantity counting means 107 are read, and the lens 1 in the meantime
M as the movement amount of 01_nMemorize And again
Set the contents to zero. In step 23, the photoelectric conversion means 202 shown in FIG.
From the focus detection calculation means 203 to detect the focus
Defocus P by calculation control means 203_{n + 1}The operation to find
Do. At the same time as the end of step 23,
Stop lens drive and transfer data in steps 25 and 26
And the calculation time T_n ^cAnd lens movement amount M_n ^c
Is calculated. In step 27, these X_n, T_n, T ’
_n, T_n ^c, M_n, M_n ^c, P_{n + 1}Using equations 4, 5,
Estimated defocus amount X using 6 and 7_{n + 1}And correction slope
k_{n + 1}To calculate. In step 28, these values are actually
Driving pulse number X_pAnd pulse interval T_pConverted to
At step 30, return to A and start the next charge accumulation cycle.
It After that, it will be repeated. As described above, according to the present invention, an optical device such as a camera
Focus detection hand that has a means to detect the defocus amount
Some have a step, but such defocus amount
By effectively utilizing the means for detecting,
The target object can be easily moved without using a detection device that moves the object.
Can now detect the movement of. In this way, the movement of the target object cannot be detected.
For example, with automatic focus adjustment devices such as cameras,
Is difficult to focus on a moving object automatically
However, by using this movement detection device,
Moving the shadow lens (imaging optics) to focus
You can In addition, other uses include moving objects.
It is also possible to easily obtain the moving speed. Thereby,
The use of optical devices has become widespread, and photography techniques such as cameras are used.
There are various useful things such as being useful for improving the technique.
It

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration example of the focus detection means of FIG. FIG. 3 is a graph showing the relationship between the movement of the imaging lens and the movement of the target object, FIG. 4 is a partially enlarged graph of FIG. 3, and FIG. 5 is a correction amount δ (τ FIG. 6 is a flow chart for explaining the operation of this embodiment, FIG. 7 is a flow chart for explaining the operation of this embodiment, and FIG. 8 is a flow chart for explaining the operation of this embodiment. 6 is a flowchart for explaining the operation of this embodiment. [Description of Signs of Main Parts] 101 ... Photographing lens 102 ... Driving means 103 ... Moving amount signal generating means 104 ... Focus detecting means 106 ... Defocus amount counting means

Claims (1)

What is claimed is: (1) An imaging optical system for forming a light image of a target object, a charge storage type photoelectric conversion means for photoelectrically converting the light image passing through the imaging optical system, and the imaging optical system. Focus detecting means for calculating a defocus amount corresponding to the amount of deviation between the image forming surface and a predetermined planned focal surface, and based on the output of the focus detecting means, in the optical axis direction of the image forming optical system. A movement detecting means for detecting the movement of the target object, wherein the movement detecting means has a predetermined timing related to the charge accumulation start and end timings of the photoelectric conversion means, or the calculation end timing of the focus detection means. A light characterized in that an amount relating to the image plane position of the target object at the timing is obtained, and the movement of the target object is calculated from the relation of the amounts relating to the image plane position at a plurality of past predetermined times.
Equipment . (2) The predetermined timing is divided into a first predetermined timing which is a timing relating to the charge accumulation time when the image plane position of the image forming optical system is detected and a second predetermined timing which is the same timing before that. The movement detecting means includes a first amount relating to the image plane position at the first predetermined timing measured based on the first lens position and a second predetermined timing measured based on the second lens position. A second quantity relating to the image plane position and a third quantity relating to the movement of the image plane due to the movement of the imaging optical system from the second lens position to the first lens position.
Optical in calculating the amount, which ranges first (1) of claims, characterized in that to calculate the image plane movement amount from the second predetermined timing until the first predetermined timing based claim, wherein Equipment . (3) The optical device obtains the image plane movement amount based on the following equation: image plane movement amount = first amount-second amount + third amount. The optical device according to item (2).