JP6039706B2 - Optical anti-vibration device, optical apparatus, and control method - Google Patents

Description

  The present invention relates to an optical image stabilizer used in an optical apparatus such as a video camera or an interchangeable lens.

  An optical image stabilizer moves an image stabilization lens that forms part of the photographic optical system or an image sensor that photoelectrically converts a subject image formed by the photographic optical system in a direction perpendicular to the optical axis in accordance with the shake of the optical device. (Shift) corrects (reduces) image blur due to shake of the optical device. A shake of the optical device is detected by a shake sensor such as an angular velocity sensor provided in the optical device, and an anti-vibration lens or an image sensor (hereinafter collectively referred to as an anti-shake lens) based on a shake detection signal output from the shake sensor. The image blur is corrected by driving the shift element (also referred to as a vibration element).

  As such an optical image stabilizer, Patent Document 1 discloses from the shake detection signal whether or not the magnitude of the shake is larger than a predetermined level and whether or not panning is in progress, and the image stabilization is performed according to the determination result. An apparatus for switching the movable amount of an element is disclosed. Specifically, when the magnitude of the shake is greater than a predetermined level and panning is not being performed, the movable amount of the vibration isolation element is set larger than in other cases. As a result, when the vibration of the optical device is large due to shooting while the user is walking, the amount of movement of the vibration isolation element is set larger than that in the case of shooting still and the vibration isolation performance is improved. On the other hand, when shooting is performed while panning, the movable amount of the image stabilizing element is limited to be smaller than that during walking shooting, and deterioration of image quality due to a large shift of the image stabilizing element during panning shooting is avoided.

JP 2010-139694 A

  However, in the optical image stabilizer disclosed in Patent Document 1, when panning is performed at high speed, it is determined that the shake is not caused by panning photography but is caused by walking photography, and the vibration isolating element is movable. The amount may be set large.

  FIG. 7A shows an example of a shake detection signal (angular velocity signal) indicating the shake of the optical device while walking. In this figure and other figures in FIG. 7, the vertical axis indicates the value (angular velocity ω) of the shake detection signal, and the horizontal axis indicates time t. FIG. 7A shows a state where the user is not walking until time TW1, and shows a state where the user is walking from time TW1 to time TW2. After time TW2, it shows a state where the user is not walking again. When walking is started at time TW1, the value of the shake detection signal exceeds the predetermined value V1, and thereafter, the polarity (sign) of the shake detection signal is inverted and the value exceeds the predetermined value −V1. During walking, a shake detection signal whose value exceeds a predetermined value (V1, -V1) is output while the polarity is alternately inverted in this way.

  FIG. 7B shows an example of a shake detection signal when panning is performed at a low speed. Panning is started at time TP1, and panning is ended at time TP2. In low-speed panning, the value of the shake detection signal exceeds the predetermined value V1, but the polarity does not alternate alternately during walking, so that it can be distinguished from walking.

  FIG. 7C shows an example of a shake detection signal when panning is performed at high speed. In high-speed panning, there are many cases in which the subject to be photographed passes once and then returns to the subject again. After panning is started at time TP3, the value of the shake detection signal exceeds the predetermined value V1, and after passing the subject once at time TP4, the direction of panning is reversed to return to the subject, and panning ends at time TP5. Has been.

  In such shooting while performing high-speed panning, the polarity of the shake detection signal is inverted after the value of the shake detection signal exceeds the predetermined value V1, and the value exceeds the predetermined value -V1, so that it is erroneously detected that shooting is being performed while walking. There is a fear. As a result, the movable amount of the image stabilizing element that should be limited to a small size during high-speed panning shooting is set large, and the image quality deteriorates due to a large shift of the image stabilizing element during the high-speed panning shooting.

  The present invention provides an optical image stabilizer and an optical apparatus equipped with the same, which can avoid setting a large amount of movement of the image stabilizer in high-speed panning photography, as in walking photography.

An optical image stabilizer as one aspect of the present invention is an optical image stabilizer that is mounted on an optical device and moves a correction lens or an image sensor to reduce image blur caused by the shake of the optical device, A shake detecting means for outputting a detection signal having a value corresponding to the magnitude of shake of the optical apparatus, and a control means for changing a movable amount from the moving center of the correction lens or the image sensor based on the value of the detection signal. The control means sets the movable amount to a reference movable amount when the value of the detection signal does not exceed the first value, and sets the value of the detection signal to the first value. After exceeding, within a predetermined first time, a second value having the same polarity as the first value and having an absolute value larger than the first value is not exceeded, and the polarity is opposite to the first value. And the value of the detection signal exceeds the first value. After that, if the second value is exceeded within the first time and the fourth value having a polarity opposite to the second value and an absolute value greater than the third value is not exceeded, The movable amount is set to be equal to or smaller than the reference movable amount .

  Note that an optical apparatus equipped with the optical image stabilizer also constitutes another aspect of the present invention.

According to another aspect of the present invention, there is provided a control method for an optical image stabilizer, which is mounted on an optical device and moves an correcting lens or an image sensor to reduce image blur caused by the shake of the optical device. A method for controlling a vibration isolator, wherein a signal acquisition step of acquiring a detection signal having a value corresponding to a magnitude of shake of the optical device, and movement of the correction lens or the image sensor based on the value of the detection signal A movable amount changing step for changing a movable amount from the center, and in the movable amount changing step, when the value of the detection signal does not exceed the first value, the movable amount is set as a reference movable amount; After a value of the detection signal exceeds the first value, a second value having the same polarity as the first value and an absolute value greater than the first value is exceeded within a predetermined first time. And a third value having the opposite polarity to the first value. If not, and after the value of the detection signal exceeds the first value, the second value is exceeded within the first time, and the second value is opposite in polarity to the second value. When the fourth value, which has an absolute value greater than 3, does not exceed the fourth value, the movable amount is set to a movable amount equal to or smaller than the reference movable amount .

  According to the present invention, at the time of high-speed panning shooting, it is possible to avoid setting the movable amount of the vibration isolation element to be large as in the case of walking shooting. Degradation of image quality during panning shooting can be suppressed.

1 is a block diagram illustrating a configuration of a camera including an optical image stabilizer that is Embodiment 1 of the present invention. FIG. FIG. 6 is a diagram illustrating integration characteristics of the optical image stabilizer of Embodiment 1. 5 is a flowchart illustrating a shooting state determination process according to the first embodiment. FIG. 6 is a diagram illustrating a waveform of a shake detection signal in each shooting state according to the first embodiment. 3 is a flowchart illustrating image stabilization processing in the first embodiment. 7 is a flowchart showing a shooting state determination process in Embodiment 2 of the present invention. FIG. 6 is a diagram illustrating a waveform of a shake detection signal in each shooting state according to the first embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a configuration of a camera (video camera, digital still camera, or the like) as an optical apparatus equipped with the optical image stabilizer that is Embodiment 1 of the present invention. Reference numeral 10 denotes a photographing optical system, which includes a variable power lens 101, a diaphragm 102, a correction lens 103 as a vibration isolation element, and a focus lens 104 in order from the subject side (left side in the figure). The photographing optical system 10 forms a subject image on light from a subject (not shown). The subject image is photoelectrically converted by the image sensor 11 including a photoelectric conversion element such as a CMOS sensor or a CCD sensor. The correction lens 103 corrects (reduces) image blur that is a shake of a subject image formed on the image sensor 11 by moving (shifting) in a direction orthogonal to the optical axis of the photographing optical system 10.

  The correction lens 103 may move in a direction orthogonal to the optical axis by rotating about one point on the optical axis (including a direction orthogonal to the optical axis as a movement direction component). .

  Reference numeral 12 denotes a shake sensor, which includes an angular velocity sensor such as a gyro sensor. The shake sensor 12 outputs an angular velocity signal as a detection signal corresponding to the magnitude of camera shake (hereinafter referred to as camera shake) (here, the magnitude of shake per unit time). In this embodiment, the shake sensor 12 includes a YAW direction GYRO sensor 121 that detects camera shake in the yaw direction that is the horizontal rotation direction, and a PITCH direction GYRO sensor 122 that detects camera shake in the pitch direction that is the vertical rotation direction. ing. However, as a shake sensor, a sensor that can detect camera shake in the pitch direction and the yaw direction with a single sensor, or a sensor that can detect camera shake in the optical axis direction in addition to the pitch direction and the yaw direction may be used.

  The angular velocity signal from the shake sensor 12 (121, 122) is input to the A / D converter 131 of the image stabilization processing unit 13, where it is converted into a digital signal. Note that a vibration isolation ON / OFF switch 14 is connected to the vibration isolation processing unit 13, and a vibration isolation operation described later is performed when the switch 14 is turned ON by the user, and the switch 14 is OFF. In this state, the image stabilization operation is not performed.

  Next, an image stabilization process performed by the image stabilization processing unit 13 as a control unit will be described. The angular velocity signal converted into a digital signal by the A / D converter 131 passes through a high-pass filter (HPF) 132 and its DC component is cut. The angular velocity signal from which the DC component has been cut is input to the integration filter 133 and is integrated there to be converted into an angular displacement signal indicating angular displacement (camera shake amount). The angular displacement signal is input to the correction amount limiter 134. The correction amount limiter 134 calculates a shift driving amount (hereinafter referred to as a lens correction amount) of the correction lens 103 from the angular displacement signal, and at the same time, a limiter value (that is, a correction lens 103 to be described later) that is a maximum allowable value of the lens correction amount. Switchable).

  The shooting state determination unit 136 determines the current shooting state such as a still shooting state, a panning shooting state, and a walking shooting state, which will be described later, from the value (angular velocity) and frequency of the angular velocity signal that has passed through the high-pass filter (HPF) 132. The determination result is input to the integration filter 133 and the correction amount limiter 134. The integration filter 133 and the correction amount limiter 134 change the integration filter characteristic and the limiter value based on the determination result, as will be described in detail later.

  The correction lens controller 135 shift-drives the correction lens 103 in a direction that cancels out image blur out of directions orthogonal to the optical axis, in accordance with a signal indicating the lens correction amount output from the correction amount limiter 134. Actually, energization to an actuator (such as a voice coil motor) that shift-drives the correction lens 103 is controlled.

  FIG. 2 shows the integral filter characteristics (denoted as integral characteristics 1 and 2 in the figure) that can be changed in the integral filter 133. In the integral characteristic 1 shown in FIG. 2A and the integral characteristic 2 shown in FIG. 2B, the lowest cutoff frequency is fc1 and the highest cutoff frequency is fc2. D1, D2, D3 and D4 indicate angular displacements of camera shake and have a relationship of D1 <D2 <D3 <D4.

  In the integral characteristic 1, the cutoff frequency is set to the lowest cutoff frequency fc1 until the angular displacement becomes D3, and gradually increases as the angular displacement becomes larger than D3. When the angular displacement becomes D4, the highest cutoff frequency fc2 is set. It is a characteristic that reaches

  On the other hand, the integral characteristic 2 is set to the lowest cutoff frequency fc1 until the angular displacement becomes D1, and gradually increases as the angular displacement becomes larger than D1, and when the angular displacement becomes D2, the highest cutoff frequency fc2 is set. It is a characteristic that reaches Even with an angular displacement greater than D2, the cutoff frequency is maintained at the highest cutoff frequency fc2.

  Here, a high cutoff frequency corresponds to a small amount of movement of the correction lens 103 (in other words, a small movable range of the correction lens 103). The movable amount of the correction lens 103 is a shiftable amount of the correction lens 103 with respect to the movement center of the correction lens 103 that is the optical axis position of the photographing optical system 10.

When the integral characteristic 2 is set, the cutoff frequency increases from a small angular displacement, and the movable amount of the correction lens 103 is set to a small first movable amount (reference movable amount) . On the other hand, when the integral characteristic 1 is set, the cutoff frequency is low until a large angular displacement, so the movable amount of the correction lens 103 is set to a second movable amount that is larger than the first movable amount.

  In the present embodiment, when the shooting state determination unit 136 determines that the current shooting state is a still shooting state in which the user stands still without taking a walk (handheld shooting), the integral characteristic 2 Set. Further, if it is determined that the user is in a walking shooting state where the user is shooting while walking, the integral characteristic 1 is set. As a result, the movable amount of the correction lens 103 can be set sufficiently large with respect to a camera shake larger than that in a still shooting state caused by walking, so that a good anti-shake performance can be obtained.

  Further, when it is determined that the panning shooting state in which the user performs panning in the yaw direction or tilting in the pitch direction (hereinafter collectively referred to as panning) that changes the camera direction following the subject, the correction lens 103 is determined. Is set to the third movable amount. The third movable amount is a movable amount equal to or smaller than the first movable amount, and may be smaller than the first movable amount, or may be the same as the first movable amount (that is, the integral characteristic 2 may be used). . By setting the third movable amount, it is possible to avoid degradation of the image quality of the captured image due to a large shift of the correction lens 103 with respect to camera shake as panning as in the case of the walking shooting state. Note that the third movable amount may be set to zero and the correction lens 103 may be fixed at the movement center in the panning photographing state.

  In the present embodiment, the case where the movable amount of the correction lens 103 is changed by changing the integral filter characteristics depending on the photographing state is described. However, the movable amount of the correction lens can be changed by other methods (electrical (Not only mechanical restrictions but also mechanical restrictions).

  FIG. 4A shows an example of an angular velocity signal indicating camera shake in the walking shooting state. In this figure and other figures in FIG. 4, the vertical axis indicates the angular velocity ω, and the horizontal axis indicates time t.

  In FIG. 4A, the still shooting state is shown until time TW1, and the walking shooting state is shown from time TW1 to time TW2. After the time TW2, the still photographing state is shown again. In the still shooting state, the angular velocity ω varies according to camera shake (camera shake) within a range not exceeding V1 (first value) and −V1 (third value) having a polarity opposite to V1.

  When the walking shooting state is started at time TW1, the angular velocity ω exceeds V1 at time TA1 due to the vibration caused by the user walking on the camera. After that, at the time TA2 within the predetermined time TS (within the first time) from the time TA1 without exceeding V2 (second value) having the same polarity (same sign) as V1 and an absolute value greater than V1. -V1 is exceeded. In the walking shooting state, an angular velocity ω exceeding V1 and −V1 is obtained while the polarities are alternately reversed in this way.

  In the same walking shooting state, if the user performs shooting while walking fast or running, the polarity is reversed while the angular velocity ω varies more greatly as shown by a two-dot chain line in FIG. That is, when the walking (running) shooting state is started at time TW1, the angular velocity ω exceeds V1 at time TA1, then exceeds V2 within a predetermined time TS from time TA1, and is opposite in polarity to V2. It also exceeds -V3 (fourth value), which has an absolute value greater than -V1.

  FIG. 4B shows an example of an angular velocity signal in a panning photographing state where panning is performed at a low speed. Panning is started at time TP1, and panning is ended at time TP2. In the low-speed panning, the angular velocity ω exceeds V1 at time TB1, but the polarity inversion that exceeds −V1 within the predetermined time TS from time TB1 does not occur as in the walking shooting state.

  FIG. 4C shows an example of an angular velocity signal in a panning photographing state where panning is performed at a high speed. Panning is started at time TP3, and after passing the subject, the direction of panning is reversed at time TP4, and the panning is completed after returning to the subject at time TP5. In high-speed panning, the angular velocity ω exceeds V1 at time TC1, and then exceeds V2 within a predetermined time TS from time TC1. However, within the predetermined time TS from the time TC1, it falls within the range of V1 and -V1 without exceeding -V3.

  Next, the shooting state determination process in the shooting state determination unit 136 will be described with reference to the flowchart of FIG.

  The shooting state determination unit 136 determines the shooting state using the angular velocity signal after passing through the HPF 132. This is because the DC component (offset component) generated from the shake sensor 12 is removed regardless of the camera shake, and the shooting state determination with higher accuracy is performed.

  When the shooting state determination process starts in step S301, the shooting state determination unit 136 determines in step S302 whether or not the angular velocity ω, which is the value of the angular velocity signal, has exceeded a threshold value V1 (first value). If the angular velocity ω does not exceed the threshold value V1, the process proceeds to step S303, and a counter for measuring the time after the angular velocity ω exceeds the threshold value V1 is reset. In step S304, it is determined that the current shooting state is a still shooting state.

  On the other hand, when it is determined in step S302 that the angular velocity ω has exceeded the threshold value V1, the shooting state determination unit 136 causes the counter to start counting up in step S305. In step S306, the imaging state determination unit 136 determines whether or not the angular velocity ω exceeds a threshold value V2 (second value) having the same polarity (that is, the same sign) as the threshold value V1 and an absolute value greater than the threshold value V1. judge.

  When the angular velocity ω does not exceed the threshold value V2, the imaging state determination unit 136 proceeds to step S310, the counting time by the counter is within the predetermined time TS (within the first time), and the angular velocity ω is equal to the threshold value V1. It is determined whether or not the reverse polarity threshold −V1 (third threshold) is exceeded. The absolute value of the threshold −V1 may be the same as the threshold V1, or may be different from the threshold V1 (a value close to V1). When the angular velocity ω exceeds the threshold value −V1, the process proceeds to step S311 and is determined to be a walking shooting state. On the other hand, if the angular velocity ω does not exceed the threshold value −V1, the process proceeds to step S312, and the panning photographing state is determined.

  When the angular velocity ω exceeds the threshold value V2 in step S306, the process proceeds to step S307. In step S307, the imaging state determination unit 136 determines that the count time is within the predetermined time TS, the angular velocity ω is opposite in polarity to the threshold value V2, and has a threshold value −V3 (fourth value) greater than the threshold value −V1. It is determined whether or not the number is exceeded. The absolute value of the threshold value −V3 may be the same as the threshold value V2, or may be different from the threshold value V2 (a value close to V2). When the angular velocity ω exceeds the threshold value −V3, the process proceeds to step S308, and it is determined that the walking shooting state is set. On the other hand, if the angular velocity ω does not exceed the threshold value −V3, the process proceeds to step S309 to determine the panning shooting state (high-speed panning).

  Next, the image stabilization operation control performed by the image stabilization processing unit 13 according to the determination result of the imaging state by the imaging state determination unit 136 described above will be described using the flowchart of FIG. This image stabilization operation control is performed by the image stabilization processing unit 13 according to an image stabilization processing program as a computer program stored in a memory (not shown).

  The image stabilization processing unit 13 that has started the image stabilization operation control in step S501 causes the A / D converter 131 to convert the angular velocity signal from the shake sensor 12 into a digital signal in step S502. In step S503, the high-pass filter (HPF) is caused to perform processing for cutting the DC component from the angular velocity signal that is a digital signal.

  Next, in step S504, the image stabilization processing unit 13 determines whether or not the current shooting state is determined to be the walking shooting state by the shooting state determination unit 136. If it is determined that the camera is in the walking shooting state, the process advances to step S505 to cause the integration filter 133 to perform integration processing using the integration characteristic 1 shown in FIG. In step S506, the limit value of the lens correction amount is set to the limiter 2 that is the maximum value. Thereby, the movable amount of the correction lens 103 is set to the second movable amount. In step S512, drive control of the correction lens 103 is started. Accordingly, the movable amount of the correction lens 103 can be set to be large in response to a large camera shake in a walking shooting state, and an image shake due to a large camera shake can be corrected favorably.

  If it is determined in step S504 that the current shooting state is not the walking shooting state, the image stabilization processing unit 13 proceeds to step S507 and determines whether the panning shooting state is determined. If the panning shooting state is not determined here, the current shooting state is the still shooting state, and the process proceeds to step S508.

  In step S508, the image stabilization processing unit 13 causes the integration filter 133 to perform integration processing using the integration characteristic 2 illustrated in FIG. In step S509, the limit value of the lens correction amount is set to the limiter 1 that is smaller than the limiter 2. Thereby, the movable amount of the correction lens 103 is set to the first movable amount. In step S512, drive control of the correction lens 103 is started. As a result, it is possible to satisfactorily correct image blur caused by camera shake due to camera shake in a still shooting state.

  If it is determined in step S507 that the camera is in the panning shooting state, the image stabilization processing unit 13 proceeds to step S510, and causes the integration filter 133 to perform integration processing using the integration characteristic 2. In step S511, the limit value of the lens correction amount is set to a limiter 3 that is smaller than the limiter 2. Thereby, the movable amount of the correction lens 103 is set to the third movable amount. In step S512, drive control of the correction lens 103 is started. Thereby, it is possible to avoid the deterioration of the image quality due to the correction lens 103 being largely shifted in the panning photographing state.

  As described above, according to the present embodiment, the shooting state can be determined with high accuracy, and the movable amount of the correction lens 103 suitable for each shooting state can be set. In particular, in the walking shooting state, the movable amount of the correction lens 103 is set to be larger than that in the still shooting state, so that a large image shake that may occur in the walking shooting state can be corrected favorably. On the other hand, it is possible to prevent erroneous detection of a panning shooting state in which high-speed panning has been performed as a walking shooting state, and it is possible to avoid deterioration of image quality due to a large shift driving of the correction lens 103 corresponding to high-speed panning.

  In the present embodiment, the case where the movable amount of the correction lens 103 is set after the shooting state is determined in steps S304, 308, 309, 311 and 312 of the flowchart shown in FIG. 3 has been described. However, it is not always necessary to determine the shooting state, and the movable amount of the correction lens 103 may be simply set in each step. The same applies to Example 2 described later.

  Next, a second embodiment of the present invention will be described. The configuration of the camera including the optical image stabilizer in the present embodiment is the same as that in the first embodiment. The flowchart of FIG. 6 shows a shooting state determination process by the shooting state determination unit 136 in the present embodiment. This anti-vibration operation control is also performed by the anti-vibration processing unit 13 in accordance with an anti-vibration processing program as a computer program stored in a memory (not shown) as in the first embodiment.

  When the shooting state determination process starts in step S601, the shooting state determination unit 136 determines in step S602 whether or not the angular velocity ω, which is the value of the angular velocity signal, has exceeded a threshold value V1 (first value). If the angular velocity ω does not exceed the threshold value V1, the process proceeds to step S603, where the counter A for measuring the time after the angular velocity ω exceeds the threshold value V1 and the time after the angular velocity ω exceeds a threshold value V2 (described later) Counter B for measuring (time 2) is reset. In step S604, it is determined that the current shooting state is a still shooting state.

  On the other hand, if it is determined in step S602 that the angular velocity ω has exceeded the threshold value V1, the shooting state determination unit 136 causes the counter A to start counting up in step S605. In step S606, the imaging state determination unit 136 determines whether or not the angular velocity ω exceeds a threshold value V2 (second value) having the same polarity (that is, the same sign) as the threshold value V1 and an absolute value greater than the threshold value V1. judge.

  When the angular velocity ω does not exceed the threshold value V2, the imaging state determination unit 136 proceeds to step S612, the count time by the counter A is within the predetermined time TS (first time), and the angular velocity ω is the threshold value V1. It is determined whether or not the threshold value -V1 (third value) of reverse polarity is exceeded. The absolute value of the threshold −V1 may be the same as the threshold V1, or may be different from the threshold V1 (a value close to V1). When the angular velocity ω exceeds the threshold value −V1, the process proceeds to step S613, and the walking shooting state is determined. On the other hand, if the angular velocity ω does not exceed the threshold value −V1, the process proceeds to step S614 to determine the panning photographing state.

  When the angular velocity ω exceeds the threshold value V2 in step S606, the imaging state determination unit 136 proceeds to step S607 and causes the counter B to start counting up. In step S608, the photographing state determination unit 136 sets the threshold value −V3 according to the count value (second time) of the counter B. Specifically, the absolute value of the threshold −V3 is increased as the count value of the counter B is larger (second time is longer). This corresponds to the fact that, in high-speed panning, the longer the time (TP3 to TP4) during which panning is performed first, the greater the angular velocity when panning is performed with the direction reversed thereafter. It is to do.

  Next, in step S609, the imaging state determination unit 136 determines that the count time of the counter A is within the predetermined time TS, the angular velocity ω is opposite in polarity to the threshold value V2, and has a threshold value −V3 that is greater than the threshold value −V1. It is determined whether or not (fourth value) has been exceeded. The absolute value of the threshold value −V3 may be the same as the threshold value V2, or may be different from the threshold value V2 (a value close to V2). When the angular velocity ω exceeds the threshold value −V3, the process proceeds to step S610, and it is determined that the walking shooting state is set. On the other hand, if the angular velocity ω does not exceed the threshold value −V3, the process proceeds to step S611 to determine the panning shooting state (high-speed panning).

  The image stabilization operation control described in the first embodiment with reference to the flowchart of FIG. 5 is performed in accordance with the determination result of the shooting state determination process.

  According to the present embodiment, when high-speed panning is performed, the threshold −V3 is changed according to the time during which high-speed panning is performed (the time during which the angular velocity ω exceeds the threshold V2). This makes it possible to more reliably avoid erroneously detecting the panning shooting state in which the high-speed panning is performed as the walking shooting state, as compared with the first embodiment. Further, since the movable amount of the correction lens 103 is set to be larger than that in the still photographing state in the walking photographing state as in the first embodiment, it is possible to satisfactorily correct large image blur that may occur in the walking photographing state.

  In each of the above embodiments, a large camera shake in which the polarity of the angular velocity ω is alternately reversed (hereinafter referred to as a large amplitude reciprocal shake) is treated as a camera shake in a walking shooting state. Can occur not only in the walking shooting state but also in a state of shooting on the vehicle, for example. For this reason, it is not always necessary to determine a large-amplitude reciprocal shake as a walking shooting state. Moreover, you may make it discriminate | determine based on the characteristic of the change of angular velocity in those states in a walk imaging | photography state and an on-vehicle imaging state.

  In each of the above embodiments, the shooting state is determined based on whether or not the reverse polarity threshold has been exceeded within a predetermined time from when the angular velocity has exceeded the threshold, but after the angular velocity has exceeded the threshold, If so, the count start point of the predetermined time is not limited to this. For example, after the angular velocity exceeds the threshold value once, counting of a predetermined time is started from the time when the same threshold value is passed again, and the shooting state is determined by whether or not the angular velocity exceeds the reverse polarity threshold value within the predetermined time. May be. Furthermore, the counting of the predetermined time is started from the time when the angular velocity exceeding the threshold reaches the peak, and the shooting state is determined by whether or not the angular velocity reaches the peak value exceeding the reverse polarity threshold within the predetermined time. Also good.

  Further, according to each of the above embodiments, the angular velocity signal after passing through the HPF is used to determine the shooting state, but other signals may be used. For example, the photographing state may be determined using an angular velocity signal before passing through the HPF or an angular displacement signal after passing through the integration filter.

  Further, in each of the above-described embodiments, the case where the correction lens as the vibration isolating element is shifted has been described. However, the image pickup element (CCD sensor or CMOS sensor) that photoelectrically converts the subject image is used as the anti-vibration element for shifting. It may be.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  An optical apparatus having a good optical image stabilization function can be provided.

103 correction lens 12 shake sensor 13 anti-vibration processing unit

Claims (6)

An optical image stabilizer that is mounted on an optical device and moves a correction lens or an image sensor to reduce image blur caused by the shake of the optical device,
Shake detection means for outputting a detection signal having a value corresponding to the magnitude of shake of the optical instrument;
Control means for changing a movable amount from the movement center of the correction lens or the image sensor based on the value of the detection signal;
The control means determines the movable amount,
If the value of the detection signal does not exceed the first value, set the reference movable amount,
After a value of the detection signal exceeds the first value, a second value having the same polarity as the first value and an absolute value greater than the first value is exceeded within a predetermined first time. And the second value within the first time after the third value having a polarity opposite to the first value and after the value of the detection signal exceeds the first value. And when the fourth value having a polarity opposite to the second value and having an absolute value larger than the third value is not exceeded, the movable amount is set to be equal to or less than the reference movable amount. An optical vibration isolator characterized. When the value of the detection signal exceeds the second value, the control means measures a second time that has exceeded the second value, and the fourth time according to the second time. The optical vibration isolator according to claim 1 , wherein the value is set. If the value of the detection signal does not exceed the second value and the third value within the first time after the value exceeds the first value, the control means sets the movable amount to zero. The optical image stabilizer according to claim 1 or 2 . If the value of the detection signal exceeds the first value and then exceeds the second value and does not exceed the fourth value within the first time, the control means moves the movable optical image stabilizer according to claim 1 or 2, characterized in that to set the amount to zero. An optical apparatus in which the optical image stabilizer according to any one of claims 1 to 4 is mounted. A method of controlling an optical image stabilizer that is mounted on an optical device and moves a correction lens or an image sensor to reduce image blur caused by the shake of the optical device,
A signal acquisition step of acquiring a detection signal having a value corresponding to the magnitude of shake of the optical instrument;
A movable amount changing step of changing a movable amount from the moving center of the correction lens or the image sensor based on the value of the detection signal;
In the movable amount changing step,
If the value of the detection signal does not exceed the first value, the movable amount is set as a reference movable amount,
After a value of the detection signal exceeds the first value, a second value having the same polarity as the first value and an absolute value greater than the first value is exceeded within a predetermined first time. And the second value within the first time after the third value having a polarity opposite to the first value and after the value of the detection signal exceeds the first value. And the movable amount is set to a movable amount equal to or smaller than the reference movable amount when the fourth value is opposite to the second value and does not exceed the fourth value having the absolute value larger than the third value. A method for controlling an optical image stabilizer, characterized by comprising: