JP4363072B2 - Blur correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blur correction device that corrects image blur by moving part or all of a lens with an optical device such as a camera, a lens, a video, or binoculars.
[0002]
[Prior art]
In recent years, in order to prevent camera shake, the technology of a shake correction device that detects camera shake and moves part of the lens along the camera shake has been established. It is being done.
[0003]
FIG. 11 is a conceptual diagram of a camera provided with a shake correction apparatus.
The camera 2 blur has 6 degrees of freedom and is divided into pitching, yawing and rolling motions, which are rotational motions of 3 degrees of freedom, and motions in X, Y and Z directions, which are translational motions of 3 degrees of freedom. It is done. The camera shake correction is usually performed for a motion with two degrees of freedom of pitching and yawing.
[0004]
The camera movement is monitored by the angular velocity sensors 3x and 3y. The angular velocity sensors 3x and 3y are piezoelectric vibration angular velocity sensors that detect Coriolis force generated by normal rotation. The angular velocity sensor 3x is an angular velocity meter for detecting pitching blur, and the angular velocity sensor 3y is for detecting yawing blur. It is an angular velocity meter.
[0005]
When shake correction is performed, the outputs of the angular velocity sensors 3x and 3y are sent to the CPUs 20x and 20y, and the CPUs 20x and 20y calculate the target drive position of the shake correction lens 4. The CPUs 20x and 20y send instruction signals to the voltage drivers 32x and 32y in order to drive the blur correction lens 4 to the target drive position, and the voltage drivers 32x and 32y respectively supply power to the VCMs 6x and 6y along the instruction signals. Supply. The blur correction lens 4 is driven by the VCMs 6x and 6y. In this way, the blur correction can be performed by driving the blur correction lens 4 according to the blur. This blur correction corresponds to a frequency band (about 0.1 to 10 Hz) of hand shake (so-called hand shake).
[0006]
On the other hand, in recent years, a shake at the time of fixing a tripod (so-called tripod shake) is also regarded as a problem. The frequency band of the tripod shake varies depending on, for example, the weight of the lens and the rigidity of the tripod, but is about 4 to 35 Hz, which is higher than the frequency band of the camera shake.
Therefore, in order to perform shake correction for both camera shake and tripod shake by driving the shake correction lens 4, it is necessary to change correction characteristics between camera shake and tripod shake.
[0007]
As for the conventional blur correction method, for example,
(1) A method of selecting a correction characteristic by operating a switch provided outside the device (see, for example, Patent Document 1),
(2) A method of changing a correction characteristic by providing a switch on a tripod seat, detecting that the switch is fixed to the tripod,
(3) A method of automatically determining a correction characteristic by determining whether the camera is supported by a hand or using a tripod based on an output from a shake detection unit (for example, an angular velocity sensor),
Has been proposed.
[0008]
[Patent Document 1]
JP 10-319463 A
[0009]
[Problems to be solved by the invention]
However, the above-described shake correction method cannot obtain a high correction effect under all circumstances. Specifically, when using a tripod that is loosely tightened (raw), or when using a monopod instead of a tripod, the shake correction method described above will cause The correction characteristic corresponding to is used. However, in this case, the correction effect is actually higher when the correction characteristic corresponding to camera shake is used.
[0010]
Therefore, the blur correction method described above has the following problems under such circumstances.
(1) In the method of changing the correction characteristic by manually operating a switch provided outside the device, the switch characteristic may be forgotten at the time of shooting, and the correction characteristic corresponding to the tripod shake may be used. Not enough.
(2) In the method of detecting tripod fixation with a switch provided on the tripod seat and setting the correction characteristic for tripod shake, the correction characteristic corresponding to the tripod shake is used, and the correction effect is not sufficiently obtained. .
(3) In the method of automatically selecting the correction characteristic from the determination of the support state, there is a possibility of erroneous determination. For example, if the photographer takes a picture without noticing the erroneous determination, a sufficient correction effect cannot be obtained.
[0011]
An object of the present invention is to provide a shake correction apparatus that can prevent a correction characteristic from being erroneously selected at the time of shooting under any circumstances.
[0012]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. That is, the invention of claim 1 detects the position of the shake detection unit (3) for detecting the shake of the imaging device, the shake correction optical member (4) for correcting the image shake, and the shake correction optical member (4). A position detection unit (7) to perform, A tripod is provided on the tripod seat, and can be operated by the photographer. The first switch outputs a first signal corresponding to whether the camera shake state or the tripod shake state according to the photographer's operation. The second switch that outputs a second signal corresponding to whether the camera shake state or the tripod shake state is determined according to the detection result of the screw, and the determination is performed according to the shake detected by the shake detection unit. And a determination unit that outputs a third signal corresponding to whether the camera shake state or the tripod shake state, and the image blur is corrected based on the first signal, the second signal, and the third signal. Using a table in which correction characteristics are determined, and the first signal, the second signal, the third signal, and the table, Correction characteristics for correcting image blur The Based on the output of the shake detection unit (3) and the output of the position detection unit (7) according to the switching unit (30) to be switched and the correction characteristics switched by the switching unit (30), the blur correction optics Based on the output of the target position calculator (22, 23, 27) for calculating the target position of the member (4) and the position detector (7), the blur correction optical member ( 4) a drive control unit (28) for controlling The table is configured such that when the first signal and the second signal are different, a signal that matches the third signal among the first signal and the second signal is selected as the correction characteristic. Stipulated This is a shake correction device.
[0013]
According to a second aspect of the present invention, in the shake correction apparatus according to the first aspect, In the table, the correction characteristic indicating that the camera shake state is selected when the first signal and the third signal do not match and the second signal and the third signal do not match is selected. What is stipulated Is a shake correction apparatus characterized by the above.
[0014]
The invention of claim 3 Claim 1 or claim 2 In the image stabilizer of It has a custom setting means for setting the correction characteristic of the table to custom. Is a shake correction apparatus characterized by the above.
[0015]
The invention of claim 4 The method according to any one of claims 1 to 3. In the image stabilizer of The shake detection unit includes an angular velocity sensor that detects an angular velocity, and a processing unit that removes a low-frequency component of a signal output from the angular velocity sensor, and the processing unit has correction characteristics switched by the switching unit. Removing low-frequency components of the signal output from the angular velocity sensor using a corresponding cutoff frequency Is a shake correction apparatus characterized by the above.
[0016]
The invention of claim 5 Claim 4 In the image stabilizer of The processing unit increases the cut-off frequency when the correction characteristic switched by the switching unit is in a camera shake state than when the correction characteristic switched by the switching unit is in a tripod shake state. Is a shake correction apparatus characterized by the above.
[0017]
The invention of claim 6 The method according to any one of claims 1 to 5. In the image stabilizer of A speed bias calculation unit that calculates a speed bias for generating a centripetal force in the blur correction optical member according to the correction characteristic switched by the switching unit; and the target position calculation unit is controlled by the speed bias calculation unit. Calculating a target position of the blur correction optical member using the calculated speed bias; Is a shake correction apparatus characterized by the above.
[0018]
The invention of claim 7 Claim 6 In the image stabilizer of The speed bias calculation unit has a smaller centripetal force of the blur correction optical member when the correction characteristic switched by the switching unit is in a shake state than when the correction characteristic switched by the switching unit is in a tripod shake state. To select the speed bias as Is a shake correction apparatus characterized by the above.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a block diagram showing an outline of an embodiment of a shake correction apparatus 100 according to the present invention. In this specification, blur correction refers to correction in the pitching direction and yawing direction. In FIG. 1, the shake correction device 100 in the pitching direction will be described, but the same applies to the shake correction device in the yaw direction. The camera 2 corresponds to the cross-sectional view of the camera 2 in the YZ plane shown in FIG. 11, and the same members are denoted by the same reference numerals, and description of overlapping portions is omitted as appropriate.
[0022]
The blur correction apparatus 100 according to the present embodiment includes a camera 2, a lens CPU 20, and the like. The camera 2 and the lens CPU 20 are connected via a low-pass filter 31, voltage drivers 32x, 32y, and the like.
The camera 2 is equipped with a lens barrel 1 and the like. The lens barrel 1 fixes the lenses 9, 10, and 11 of the photographing optical system, the support bases 12, 13, and 14 of the lenses 9, 10, and 11, the angular velocity sensor 3, the shake correction lens 4, and the shake correction lens 4. A lens chamber 5, a VCM 6 for driving the blur correction lens 4, a correction lens position detector (PSD) 7 for detecting the position of the blur correction lens 4, and a lock unit 8 of the blur correction lens 4. A correction SW 15, a correction mode SW 16, a tripod seat 17, a tripod seat SW 18 provided on the tripod seat 17, and the like.
Further, the blur correction lens 4 can move up and down so as to correct the inclination of the optical axis 19 due to the blur in the pitching direction. The angular velocity sensor 3 is a vibration gyro sensor that detects vibration. The correction SW 15 outputs a signal indicating whether or not to perform blur correction to the lens CPU 20.
[0023]
The lens CPU 20 includes an LPF processing unit 21, a speed bias calculation unit 22, a lens target speed conversion unit 23, an integration calculation unit 27, a control unit 28, a support state determination unit 29, a correction characteristic selection unit 30, and the like. It has. The speed bias calculation unit 22 includes a speed bias table 50, for example.
The lens CPU 20 is connected to a zoom (focal length) encoder 24, a focusing (absolute distance) encoder 25, an EEPROM 26, and the like, and further connected to a body CPU 40, a release switch 41, and the like via a lens contact 33.
[0024]
The lens CPU 20 communicates with the body CPU 40 via the lens contact 33. Information on the release switch 41 is input to the body CPU 40, and it can be detected whether the release switch 41 is half-pressed or fully pressed. In synchronization with the release switch 41 being half-pressed ON, a shake correction start command is sent from the body CPU 40 to the lens CPU 20 in synchronization with the half-pressing OFF.
However, the signal output from the correction SW 15 is prioritized between the shake correction start command and the shake correction stop command by the release switch 41 and the signal output from the correction SW 15 described above.
[0025]
Here, the flow of various signals (data) in the lens CPU 20 will be schematically described.
The output of the angular velocity sensor 3 is subjected to removal of a high-frequency noise component through a low-pass filter 31, and then quantized by an A / D converter and inputted into the lens CPU 20 as angular velocity data ω1.
The angular velocity data ω1 input into the lens CPU 20 is subjected to LPF processing (here, also serves as a function to eliminate the influence of drift of the angular velocity sensor 3) in the LPF processing section 21 in order to obtain the center level. . In the LPF process, for example, the angular velocity data ω3 from which the drift component (low frequency component) ω2 of the angular velocity sensor 3 is removed is calculated, and the angular velocity data ω3 is output to the support state determination unit 29 and the lens target velocity conversion unit 23. To do.
[0026]
Based on the angular velocity data ω3, the support state determination unit 29 performs a blur determination for determining whether the camera 2 is in a hand-held state or a state where the camera 2 is fixed to a tripod or the like (see FIG. 7: described later). A signal q indicating the result is output to the correction characteristic selection unit 30.
The correction characteristic selection unit 30 receives the signal q from the support state determination unit 29, the signal m from the correction mode SW16, and the signal n from the tripod seat SW18. At least two signals (two types of information) are selected from these signals. ) To select a correction characteristic, create a signal e indicating the correction characteristic, and output the signal e to the speed bias calculation unit 22 and the LPF processing unit 21.
The output of the PSD 7 is input to the speed bias calculation unit 22 and the control unit 28 as the position signal Ir of the blur correction lens 4 via the A / D converter.
[0027]
The velocity bias calculation unit 22 calculates velocity bias data s1 based on the velocity bias table 50 and the position signal Ir in accordance with the signal e, and subtracts the velocity bias data s1 from the angular velocity data ω3.
For example, the lens target speed conversion unit 23 converts information obtained from the zoom encoder 24, information obtained from the focusing encoder 25, information obtained from the EEPROM 26, and ω3-s1 that is output from the speed bias calculation unit 22. Based on this, the target speed signal Vc of the blur correction lens 4 is calculated, and this target speed signal Vc is output to the integral calculation unit 27. The integral calculation unit 27 calculates the target position signal Ic of the blur correction lens 4 by integrating the target speed signal Vc, and outputs the target position signal Ic to the control unit 28.
The control unit 28 calculates a drive signal p for the blur correction lens 4 based on the target position signal Ic and the position signal Ir. This drive signal p is input as a digital drive signal to the voltage drivers 32x and 32y via the D / A converter.
[0028]
Hereinafter, functions and the like of each member will be described in detail.
In the LPF processing unit 21, for example, LPF 1 and LPF 2 having different cutoff frequencies fc are selectively used according to the signal e from the correction characteristic selection unit 30. Here, the relationship between the cutoff frequencies is LPF1 <LPF2.
The LPF 1 is a filter having a cutoff frequency for camera shake correction, and is set to a cutoff frequency of about 0.1 Hz, for example.
The LPF 2 is a filter having a cutoff frequency for tripod blur correction, and is set to a cutoff frequency of about 2 Hz, for example.
[0029]
Here, selection of the cut-off frequency will be described.
FIG. 2 is a diagram showing the frequency distribution of drift, hand shake, and tripod shake of the angular velocity sensor 3. The horizontal axis is frequency and the vertical axis is blur angle.
As shown in FIG. 2, the frequency band of shake during handheld shooting is about 0.1 to 10 Hz, and the frequency band when the tripod is fixed is about 4 to 35 Hz, and the frequency bands are different. Further, the angular velocity sensor 3 has a drift (DC component to 0.1 Hz) in its output when the power is turned on. Therefore, at the time of hand-held shooting, the cutoff frequency fc is set to LPF1, and the drift component of the angular velocity sensor 3 is removed as much as possible.
[0030]
Further, the frequency component of tripod shake is located at a higher frequency than the frequency component of hand shake. Further, the tripod blur angle is smaller than the camera shake, and is relatively susceptible to the drift of the angular velocity sensor 3.
Therefore, at the time of tripod blur correction, the cutoff frequency fc of the LPF processing unit 21 needs to be set higher than that at the time of camera shake correction to enhance the drift removal effect. Therefore, when the tripod is fixed, the cutoff frequency fc is set to LPF2.
[0031]
Returning to the description of FIG. As described above, the speed bias calculation unit 22 subtracts the speed bias data s1 from the angular speed data ω3 (speed bias processing). This speed bias processing is to give the blur correction lens 4 a centripetal force toward the bias center position Bini.
The speed bias data s1 is obtained by using the speed bias table 50 after subtracting the bias center position Bini from the position signal lr of the blur correction lens 4 detected by the PSD 7. The bias center position Bini is a variable.
[0032]
Here, the speed bias table 50 will be described.
FIG. 3 is a diagram showing a speed bias table 50 used in the speed bias calculation unit 22. The horizontal axis is the position signal lr of the blur correction lens 4, and the vertical axis is the speed bias data s1.
As shown in the figure, the speed bias data s1 is a cubic function of the position signal lr of the blur correction lens 4 (s1 = KB × Ir). ^Three ). The speed bias constant KB has two types of constants (KB1 <KB2), that is, KB1 for camera shake correction and KB2 for tripod shake correction.
Therefore, the centripetal force at the time of tripod blur correction becomes larger than the centripetal force at the time of camera shake correction. For example, since the blur amount when the tripod is fixed is small, the blur correction lens 4 moves excessively due to the drift of the angular velocity sensor 3. Can be prevented.
[0033]
Returning to the description of FIG. As described above, the lens target speed conversion unit 23 includes the focal length information obtained from the zoom encoder 24, the subject (absolute) distance information obtained by the focusing encoder 25, the lens-specific information written in the EEPROM 26, and the speed. Based on ω3-s1 that is an output from the bias calculation unit 22, a target speed signal Vc of the blur correction lens 4 is calculated. The target speed signal Vc of the blur correction lens 4 is input to the integration calculation unit 27, converted into the target position signal lc, and input to the control unit 28.
[0034]
The control unit 28 performs tracking control so that the blur correction lens 4 is driven according to the target position information lc of the blur correction lens 4. Here, the target position signal lc and the position signal of the blur correction lens 4 are controlled. PID control is performed using the deviation of lr.
FIG. 4 is a block diagram illustrating the operation principle of the control unit 28.
First, the control unit 28 subtracts the position signal lr from the target position signal lc and multiplies the value by a proportional constant Kp (proportional term).
Further, the result of subtracting the position signal lr from the target position signal lc is added to the subtracted information one sampling before, and the numerical value is multiplied by an integral constant Ki (integral term).
Further, the subtracted information one sampling before is subtracted from the result of subtracting the position signal lr from the target position signal lc, and the numerical value is multiplied by a differential constant Kd (differential term). Here, Z represents Z conversion, and 1 / Z represents information before one sampling.
The result obtained by multiplying the proportional constant Kp, the result obtained by multiplying the integral constant Ki, and the result obtained by multiplying the differential constant Kd are all added to obtain the output of the PID control unit.
[0035]
Returning to the description of FIG. The output of the control unit 28 is the drive signal p as described above, and is input as a digital drive signal to the voltage drivers 32x and 32y via the D / A converter. The voltage driver 32 x performs switching on the drive signal, applies a voltage to a coil portion (not shown) of the drive VCM 6 of the blur correction lens 4, and drives the VCM 6. Further, the lens CPU 20 can control energization to the lock unit 8 via the voltage driver 32y, and can instruct to drive the locking and unlocking of the blur correction lens 4.
Further, the position of the blur correction lens 4 is monitored by the PSD 7 and, as described above, is fed back to the control unit 28 and the speed bias calculation unit 22 as the position signal Ir through the A / D converter.
[0036]
Next, the correction SW 15 and the correction mode SW 16 will be described.
FIG. 5 is a diagram showing the correction SW 15 and the correction mode SW16.
The correction mode SW16 is an external operation switch provided in the lens barrel 1, and can be switched to either camera shake or tripod shake by the photographer. The correction mode SW 16 detects the switching operation by the photographer as an operation signal (signal m), and outputs this signal m to the correction characteristic selection unit 30 in the lens CPU 20.
The state of the correction SW 15 provided in the lens barrel 1 is monitored by the lens CPU 20. For example, if the correction SW 15 is ON, the lens CPU 20 performs blur correction. On the other hand, if the correction SW 15 is OFF, a signal n (described later) from the tripod seat SW 18 and the above-described shake correction start command from the body CPU 40 are performed. Is ignored and image stabilization is not performed. The correction SW 15 and the correction mode SW 16 can be arranged at appropriate positions as long as they can be manually switched by a photographer or the like.
[0037]
Next, the tripod seat SW18 will be described.
FIG. 6 is a diagram showing details of the tripod seat SW18.
The tripod seat SW18 is a switch that is provided on the tripod seat 17 and changes its state when the support state of the camera 2 is fixed, and can automatically detect whether the tripod is fixed. Further, the tripod seat SW18 generates a signal n indicating ON when the support state is fixed, and OFF when the support state is handheld, and outputs the signal n to the correction characteristic selection unit 30 in the lens CPU 20.
[0038]
The principle that the signal n is generated will be described.
A tripod seat 17 provided in the lens barrel 1 is formed with a tripod screw hole 17a. The tripod screw hole 17a has a notch 17b. The tripod seat SW18 includes, for example, a leaf spring 18a disposed in the notch 17b and a GND contact 18b.
A voltage of +5 V is applied to the leaf spring 18a. As a fixing screw (not shown) provided on a tripod or the like is inserted into the tripod screw hole 17a, the leaf spring 18a is pushed by the fixing screw and changes its state. The leaf spring 18a is pressed by the fixing screw to come into contact with the GND contact 18b connected to the GND, and the voltage of the leaf spring 18a becomes 0V. Since the voltage of the leaf spring 18a is monitored by the lens CPU 20, it is held by hand when the voltage of the leaf spring 18a is + 5V (hand shake: signal n = OFF), and fixed to a tripod when the voltage is 0V (tripod shake: signal = ON) is automatically detected.
[0039]
Next, a shake determination method of the support state determination unit 29 will be described.
FIG. 7 is a diagram showing in detail the blur determination process.
The blur determination is to determine whether the camera 2 is in a hand-held state or fixed to a tripod or the like. The blur determination is performed on the angular velocity data ω3 (see FIG. 1) from which the drift component of the angular velocity sensor 3 is removed. Further, the angular velocity data ω3 detected when the hand is held has a larger amplitude and a lower frequency than when the angular velocity data ω3 is fixed to a tripod or the like. On the other hand, the angular velocity data ω3 detected when it is fixed has a small amplitude and a high frequency.
[0040]
Therefore, as shown in FIG. 7, the threshold value ωk is set to the amplitude value, the amplitude value is taken in at the sampling interval st, the threshold value ωk is compared with the magnitude of the amplitude value, and the number of times larger than the threshold value is set for a certain time Count (n × st time).
In the figure, the circled parts are counted. When the count number k becomes larger than a certain threshold number r within a certain time (r = <k), it is determined that the hand is held (shake). Conversely, if the number of counts is r> k, it is determined that the tripod is fixed (tripod shake). When the determination is completed, the count number k is reset to zero.
The support state determination unit 29 automatically generates a signal q indicating hand shake or tripod shake by performing the above-described blur determination process, and outputs the signal q to the correction characteristic selection unit 30.
[0041]
Next, a correction characteristic selection method by the correction characteristic selection unit 30 will be described.
As described above, the correction characteristic selection unit 30 includes the signal m (camera shake or tripod shake) from the correction mode SW16, the signal n (ON or OFF) from the tripod seat SW18, and the signal q (from the support state determination unit 29). (Hand shake or tripod shake) is input, and a correction characteristic (hand shake or tripod shake) is selected based on at least two signals from these signals.
[0042]
(Regarding the selection method of the correction characteristic using the first table)
FIG. 8 is a diagram showing a first table in which the correction mode SW16 and the tripod seat SW18 are combined.
The first table 60 includes, for example, items indicating a state 61 of the correction mode SW16, a state 62 of the tripod seat SW18, a correction characteristic 63, and a selection reason 64 for the correction characteristic 63. It is shown for every ~ 4.
[0043]
In Case 1, when the correction mode SW16 is shaken and the tripod seat SW18 is OFF, the correction characteristic is set to shake (reason: a hand-held state is expected).
In case 2, when the correction mode SW16 is shaken and the tripod seat SW18 is ON, the correction characteristic is set to shake (reason: a tripod is in a state of being fastened and a state of being fixed to one leg is expected). .
In Case 3, when the correction mode SW16 is tripod shake and the tripod seat SW18 is OFF, the correction characteristic is set to camera shake (reason: the photographer is expected to forget to switch the correction mode SW16. ).
In Case 4, when the correction mode SW16 is tripod shake and the tripod seat SW18 is ON, the correction characteristic is set to tripod shake (reason: a fixed tripod state is expected).
[0044]
Therefore, according to cases 1 and 4, when the detection result of the correction mode SW16 matches the detection result of the tripod seat SW18, the correction characteristic selection unit 30 switches the correction characteristic according to the detection result.
According to Case 2, when the detection result of the correction mode SW16 is different from the detection result of the tripod seat SW18, the correction characteristic selection unit 30 switches the correction characteristic by giving priority to the detection result of the correction mode SW16.
According to Case 3, when the detection result of the correction mode SW16 and the detection result of the tripod seat SW18 are different, the correction characteristic selection unit 30 switches the correction characteristic by giving priority to the detection result of the tripod seat SW18.
[0045]
According to the correction characteristic selection method using the first table 60, (1) the correction characteristic selection unit 30 is a combination of the correction mode SW16 (signal m) and the tripod seat SW18 (signal n). By selecting the correction characteristics using, the camera shake correction is effective in the conventional shake correction methods, for example, when using a tripod with some screws tightened or when using a monopod. In spite of this, even when tripod shake correction is selected, it is possible to reduce the possibility of erroneous tripod shake correction being selected as much as possible.
(2) The correction characteristic selection unit 30 responds to the camera shake when the detection result of the correction mode SW16 (signal m) is detected as a tripod shake and the detection result of the tripod seat SW18 (signal n) is detected as a shake. Since the correction characteristics are switched, it is possible to reduce the selection of an incorrect correction characteristic due to an erroneous operation of the photographer as much as possible.
[0046]
(Regarding the selection method of the correction characteristic using the second table)
FIG. 9 is a diagram illustrating a second table in which the correction mode SW16 and the support state determination unit 29 are combined.
The second table 70 includes items indicating, for example, the state 71 of the correction mode SW16, the automatic determination result 72 of the support state determination unit 29, the correction characteristic 73, and the selection reason 74 of the correction characteristic 73. Is shown for each case 1-4.
[0047]
In Case 1, when the correction mode SW16 is shake and the automatic determination result of the support state determination unit 29 is shake, the correction characteristic is set to shake (reason: a hand-held state is expected).
In Case 2, when the correction mode SW16 is a shake and the automatic determination result of the support state determination unit 29 is a tripod shake, the correction characteristic is set to a shake (reason: a state where a tripod is tightened and a leg is fixed) Is expected).
In case 3, when the correction mode SW16 is tripod shake and the automatic determination result of the support state determination unit 29 is camera shake, the correction characteristic is set to camera shake (reason: the photographer forgets to switch the correction mode SW16) Expected).
In Case 4, when the correction mode SW16 is tripod shake and the automatic determination result of the support state determination unit 29 is tripod shake, the correction characteristic is set to tripod shake (reason: a fixed tripod state is expected). ).
[0048]
Therefore, according to cases 1 and 4, when the detection result of the correction mode SW16 matches the detection result of the support state determination unit 29, the correction characteristic selection unit 30 switches the correction characteristic according to the detection result.
According to Case 2, when the detection result of the correction mode SW16 is different from the detection result of the support state determination unit 29, the correction characteristic selection unit 30 switches the correction characteristic by giving priority to the detection result of the correction mode SW16.
According to Case 3, when the detection result of the correction mode SW16 and the detection result of the support state determination unit 29 are different, the correction characteristic selection unit 30 gives priority to the detection result of the support state determination unit 29 and sets the correction characteristic. Switch.
[0049]
According to the correction characteristic selection method using the second table 70, (1) the correction characteristic selection unit 30 is a combination of the correction mode SW16 (signal m) and the determination result (signal q) of the support state determination unit 29. In the conventional blur correction method, for example, when a correction characteristic is selected using a certain second table 70, for example, when a part of a tripod is used with a screw, or when using a monopod, Even when the camera shake correction is effective, even when the tripod shake correction is selected, it can be reduced as much as possible that the tripod shake correction is erroneously selected.
(2) The correction characteristic selection unit 30 detects a shake when the detection result of the correction mode SW16 (signal m) is detected as a tripod shake and the detection result of the support state determination unit 29 (signal q) is detected as a shake. Since the corresponding correction characteristic is switched, it is possible to reduce as much as possible the selection of an incorrect correction characteristic due to an erroneous operation of the photographer.
[0050]
(Regarding the selection method of the correction characteristic using the third table)
FIG. 10 is a diagram illustrating a third table in which the correction mode SW16, the tripod seat SW18, and the support state determination unit 29 are combined.
The third table 80 includes, for example, the state 81 of the correction mode SW16, the state 82 of the tripod seat SW18, the automatic determination result 83 of the support state determination unit 29, the correction characteristic 84, and the selection reason 85 of the correction characteristic 84. These items are shown for each case 1-8.
[0051]
In Case 1, when the correction mode SW16 is shaken, the tripod seat SW18 is OFF, and the automatic determination result of the support state determination unit 29 is shake, the correction characteristic is set to shake (reason: a handheld state is expected) )
In Case 2, when the correction mode SW16 is shaken, the tripod seat SW18 is OFF, and the automatic determination result of the support state determination unit 29 is tripod shake, the correction characteristic is set to shake (reason: small chance shake) The situation is considered and a misjudgment is expected).
[0052]
In the case 3, when the correction mode SW16 is tripod shake, the tripod seat SW18 is ON, and the automatic determination result of the support state determination unit 29 is camera shake, the correction characteristic is set to camera shake (reason: the body is fastened to the tripod) State, one leg fixed state is expected).
In Case 4, when the correction mode SW16 is shaken, the tripod seat SW18 is ON, and the automatic determination result of the support state determination unit 29 is tripod shake, the correction characteristic is set to tripod shake (reason: the photographer It is expected that switching of the correction mode SW16 has been forgotten).
[0053]
In Case 5, when the correction mode SW16 is tripod shake, the tripod seat SW18 is OFF, and the automatic determination result of the support state determination unit 29 is camera shake, the correction characteristic is set to camera shake (reason: correction by the photographer) It is expected that mode SW16 has been forgotten).
In case 6, when the correction mode SW16 is tripod shake, the tripod seat SW18 is OFF, and the automatic determination result of the support state determination unit 29 is tripod shake, the correction characteristic is set to tripod shake (reason: tripod seat) 17 can be fixed without using it, for example, it can be expected to be mounted on a table.
[0054]
In the case 7, when the correction mode SW16 is tripod shake, the tripod seat SW18 is ON, and the automatic determination result of the support state determination unit 29 is camera shake, the correction characteristic is set to camera shake (reason: live on a tripod) State, one leg fixed state is expected).
In Case 8, when the correction mode SW16 is tripod shake, the tripod seat SW18 is ON, and the automatic determination result of the support state determination unit 29 is tripod shake, the correction characteristic is set to tripod shake (reason: tripod fixed). Is expected).
[0055]
Therefore, according to cases 1 and 8, when the two detection results of the automatic determination results of the tripod seat SW18 and the support state determination unit 29 match the detection results of the correction mode SW16, the correction characteristic selection unit 30 The correction characteristic is switched according to the matching detection result.
[0056]
According to cases 2, 3, and 6, the correction characteristic selection unit 30 gives priority to the detection result of the correction mode SW16 when two detection results of the tripod seat SW18 and the automatic determination result of the support state determination unit 29 are different. Switch to correction characteristics.
[0057]
According to Case 7, when the two detection results of the automatic determination result of the tripod seat SW18 and the support state determination unit 29 are different, the correction characteristic selection unit 30 switches to a correction characteristic different from the detection result of the correction mode SW16.
[0058]
According to cases 4 and 5, the correction characteristic selection unit 30 is a case where the two detection results of the tripod seat SW18 and the automatic determination result of the support state determination unit 29 match, and are different from the detection result of the correction mode SW16. In this case, the detection result of the automatic determination result of the tripod seat SW18 and the support state determination unit 29 is prioritized and switched to the correction characteristic.
[0059]
According to the correction characteristic selection method using the third table 80, the correction characteristic selection unit 30 determines the correction mode SW16 (signal m), the tripod seat SW18 (signal n), and the determination results (signals) of the support state determination unit 29. By selecting the correction characteristic using the third table 80 that is a combination with q), it is possible to reduce the possibility that an incorrect correction characteristic is selected under any circumstances.
[0060]
According to the correction mode SW16 (signal m), since the correction mode SW16 is an external operation switch provided in the lens barrel 1, it is possible to detect a manual operation of the photographer.
According to the tripod seat SW18 (signal n), the tripod seat SW18 is provided with a leaf spring 18a. When the camera 2 is fixed, the leaf spring 18a changes its state, so that the camera shake or tripod shake is automatically performed. Can be detected.
According to the support state determination unit 29 (signal q), the support state determination unit 29 sets the threshold value ωk to the amplitude of the angular velocity data ω1 based on the angular velocity data ω1 that is the output of the angular velocity sensor 3, and further Since the number of times larger than the threshold value ωk (threshold number r) is counted, hand shake or tripod shake can be automatically detected.
[0061]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) Each case of the first table 60 and the second table 70 is a combination using the state of the correction mode SW16. For example, the state of the tripod seat SW18 and the automatic determination of the support state determination unit 29 are A new combination table may be created to determine the correction characteristics.
Thereby, the correction characteristic selection unit 30 can switch the correction characteristic based on two pieces of information by the automatic detection unit that automatically detects camera shake or tripod shake.
[0062]
(2) The correction characteristic selection unit 30 determines the correction characteristic using cases 1 to 4 of the first table 60, but other cases may be used. Instead of case 2, for example, assuming that the photographer has forgotten to switch the correction mode SW16, “correction mode SW16: camera shake, tripod seat SW18: ON, correction characteristic: tripod shake” is set. 1 may be used. Further, instead of the case 3, for example, assuming a state where the tripod base 17 is fixed without being used, for example, a state where the tripod base 17 is placed on a table, “correction mode SW16: tripod runout, tripod base SW18: OFF, Case 3-1 with “correction characteristics: tripod shake” may be used.
[0063]
(3) Although the correction characteristic selection unit 30 has determined the correction characteristic using the cases 1 to 4 of the second table 70, other cases may be used. For example, assuming that the photographer has forgotten to switch the correction mode SW16 instead of the case 2, “correction mode SW16: camera shake, automatic determination result of the support state determination unit 29: tripod shake, correction characteristic: tripod Case 2-1 which is “runout” may be used. Further, in place of the case 3, for example, assuming a state where the tripod seat 17 is fixed without being used, for example, a state where it is placed on a table, etc., “correction mode SW16: tripod runout, support state determination unit 29 Case 3-1 with “automatic determination result: tripod shake, correction characteristic: tripod shake” may be used. If these modifications can be set by a custom setting function, a photographer or the like can perform blur correction according to his / her preference.
[0064]
【The invention's effect】
As described in detail above, (1) the switching unit switches the correction characteristics for correcting image blur based on at least two types of information, and the target position calculation unit is the correction switched by the switching unit. According to the characteristics, the target position of the shake correction optical member is calculated based on the output of the shake detection unit and the output of the position detection unit, and the drive control unit follows the target position based on the output of the position detection unit. In addition, since the blur correction optical member is controlled, it is possible to prevent the correction characteristic from being erroneously selected at the time of shooting under any circumstances.
[0065]
(2) The switching unit switches the correction characteristics based on information from the first detection unit that detects an operation signal indicating camera shake or tripod shake and the second detection unit that automatically detects camera shake or tripod shake. Therefore, the selection of an incorrect correction characteristic can be reduced as much as possible.
[0066]
(3) Since the switching unit switches the correction characteristic as a camera shake when the information of the first detection unit and the information of the second detection unit are different, an incorrect correction characteristic is automatically selected. Can be reduced as much as possible.
[0067]
(4) Since the first detection unit is an external operation switch provided in the imaging apparatus, it is possible to detect a manual operation by a photographer or the like.
[0068]
(5) Since the second detection unit is a switch whose state changes when the imaging apparatus is fixed, it can automatically detect camera shake or tripod shake.
[0069]
(6) Since the second detection unit detects the support state of the imaging device based on the output of the shake detection unit, it is possible to automatically detect camera shake or tripod shake.
[0070]
(7) Since the switching unit switches the correction characteristics based on information from the automatic detection unit that automatically detects camera shake or tripod shake, it is possible to reduce selection of an incorrect correction characteristic as much as possible.
[0071]
(8) Since the automatic detection unit is a switch whose state changes when the imaging apparatus is fixed, it can automatically detect camera shake or tripod shake.
[0072]
(9) Since the automatic detection unit detects the support state of the imaging device based on the output of the shake detection unit, it is possible to automatically detect camera shake or tripod shake.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an outline of an embodiment of a shake correction apparatus 100 according to the present invention.
FIG. 2 is a diagram showing frequency distributions of drift, hand shake, and tripod shake of the angular velocity sensor 3;
FIG. 3 is a diagram showing a speed bias table 50 used in the speed bias calculation unit 22;
4 is a block diagram showing an operation principle of a control unit 28. FIG.
FIG. 5 is a diagram showing a correction SW15 and a correction mode SW16.
FIG. 6 is a diagram showing details of a tripod seat SW18.
FIG. 7 is a diagram showing details of blur determination processing;
FIG. 8 is a diagram showing a first table in which a correction mode SW16 and a tripod seat SW18 are combined.
FIG. 9 is a diagram showing a second table in which the correction mode SW16 and the support state determination unit 29 are combined.
FIG. 10 is a diagram showing a third table in which a correction mode SW16, a tripod seat SW18, and a support state determination unit 29 are combined.
FIG. 11 is a conceptual diagram of a camera provided with a shake correction apparatus.
[Explanation of symbols]
3 Angular velocity sensor
4 Vibration reduction lens
6 VCM
7 PSD
16 Correction mode SW
17 Tripod socket
18 Tripod SW
20 Lens CPU
21 LPF processing section
22 Speed bias calculator
23 Lens target speed converter
27 Integral calculation unit
28 Control unit
29 Supporting state determination unit
30 Correction characteristic selection part
50 Speed bias table
60 First table
70 Second table
80 3rd table
100 image stabilizer
Ic Target position signal
Ir position signal

Claims (7)

A shake detection unit that detects shake of the imaging device;
A blur correction optical member for correcting image blur;
A position detector for detecting the position of the blur correction optical member;
A first switch that can be operated by a photographer and that outputs a first signal corresponding to whether the camera shake state or the tripod shake state according to the operation of the photographer;
A second switch that is provided in the tripod seat and outputs a second signal corresponding to whether it is in a hand shake state or a tripod shake state in accordance with a detection result of a tripod screw;
A determination unit that performs a determination according to the shake detected by the shake detection unit, and outputs a third signal corresponding to whether the camera shake state or the tripod shake state;
A table in which correction characteristics for correcting image blur are determined based on the first signal, the second signal, and the third signal;
A switching unit that switches correction characteristics for correcting image blur using the first signal, the second signal, the third signal, and the table ;
In accordance with the correction characteristics switched by the switching unit, based on the output of the shake detection unit and the output of the position detection unit, a target position calculation unit that calculates a target position of the shake correction optical member;
A drive control unit that controls the blur correction optical member to follow the target position based on the output of the position detection unit ;
The table is defined such that when the first signal and the second signal are different, a signal that matches the third signal is selected as the correction characteristic among the first signal and the second signal. A blur correction device characterized by comprising: The blur correction device according to claim 1,
In the table, the correction characteristic indicating that the camera shake state is selected when the first signal and the third signal do not match and the second signal and the third signal do not match is selected. A blur correction device characterized by being defined . The blur correction device according to claim 1 or 2 ,
A blur correction device comprising custom setting means for customizing the correction characteristics of the table . In the blurring correction apparatus according to any one of claims 1 to 3 ,
The shake detection unit includes an angular velocity sensor that detects an angular velocity, and a processing unit that removes a low-frequency component of a signal output from the angular velocity sensor,
The blur correction apparatus according to claim 1, wherein the processing unit removes a low-frequency component of the signal output from the angular velocity sensor using a cutoff frequency corresponding to the correction characteristic switched by the switching unit. The blur correction device according to claim 4 ,
The processing unit increases the cutoff frequency when the correction characteristic switched by the switching unit is in a camera shake state than when the correction characteristic switched by the switching unit is in a tripod shake state. Shake correction device. In the blurring correction apparatus according to any one of claims 1 to 5 ,
A speed bias calculation unit that calculates a speed bias for generating a centripetal force in the blur correction optical member according to the correction characteristic switched by the switching unit;
The target position calculator calculates a target position of the camera shake correction optical member using the speed bias calculated by the speed bias calculator . The blur correction device according to claim 6 ,
The speed bias calculation unit has a smaller centripetal force of the blur correction optical member when the correction characteristic switched by the switching unit is in a shake state than when the correction characteristic switched by the switching unit is in a tripod shake state. The blur correction apparatus is characterized by selecting the speed bias as described above .

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