JP2009134058A - Camera system and camera body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten starting time of a camera in a camera system which corrects image blur when photographing. <P>SOLUTION: A control part 8 detects the position of a correction lens 2a as a correction optical system which varies an optical axis, and drives the correction lens 2a in order to correct the image blur on an image surface caused by shake by the correction lens 2a, calculates a control parameter that is a shake correction control means adjusted value showing an operation condition of the correction lens 2a, and stores the calculated control parameter in a flash memory. When a power source of the camera 1 is turned on, the control part 8 decides whether to perform the image blur correction by using the control parameter already recorded in the flash memory or newly calculating the control parameter, and performs the image blur correction by using the control parameter based on a result of decision. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a camera system and a camera body for photographing.

  The following shake correction cameras are known. This shake correction camera calculates and stores in advance a gain adjustment value for adjusting variation in gain of an output value from an angular velocity detection unit that detects angular velocity due to shake. Then, using the stored gain adjustment value, the fluctuation of the gain of the output value from the angular velocity detection unit is corrected to perform shake correction (for example, Patent Document 1).

JP-A-7-261224

  However, when a gain adjustment value stored in advance is used as a parameter to correct the output value from the angular velocity detection unit as in a conventional shake correction camera, the parameter value is a fixed value. Therefore, shake correction cannot be performed with parameter values according to the shooting environment.To avoid this, it is necessary to calculate parameter values according to the shooting environment when starting the camera. The problem of taking time arises.

A camera system according to the present invention includes at least one of a shake correction optical system capable of changing an optical axis and a movable image pickup unit, and includes shake correction means for correcting image shake on an image plane caused by shake. A shake correction control means for detecting and driving the position of the correction means, an adjustment value calculation means for calculating an adjustment value for shake correction control means indicating an operating condition of the shake correction control means, and a storage means for storing the adjustment value for shake correction control means And, when the camera is turned on, the image blur correction control unit adjustment value (previous adjustment value) calculated by the adjustment value calculation unit and already stored in the storage unit is used to correct image blur, The adjustment value calculation unit newly calculates a shake correction control unit adjustment value, and determines whether to perform image blur correction using the newly calculated shake correction control unit adjustment value (new adjustment value). And judging means, by using the shake correction control means adjustment value based on the determination result by the determination means so as to correct the image blur, characterized in that it comprises a process control means for operating the vibration reduction control means.
The camera body according to the present invention includes a movable image pickup unit, and includes a shake correction unit that corrects an image shake on an image plane caused by the shake, a shake correction control unit that detects and drives the position of the shake correction unit, and a shake. An adjustment value calculating means for calculating an adjustment value for shake correction control means indicating the operating condition of the correction control means, a storage means for storing the adjustment value for shake correction control means, and an adjustment value calculating means when the camera is turned on. Then, image blur correction is performed using the shake correction control means adjustment value (previous adjustment value) already stored in the storage means, or the adjustment value calculation means newly calculates the shake correction control means adjustment value. , A determination unit that determines whether to perform image blur correction using the newly calculated shake correction control unit adjustment value (new adjustment value), and a shake correction control based on a determination result by the determination unit Use stage adjustment value to correct the image blur, characterized in that it comprises a process control means for operating the vibration reduction control means.
In the camera system and the camera body according to the present invention, the determination unit may determine that the previous adjustment value is used when the camera returns from the power saving state.
The determination unit may further perform the determination after the shooting is performed.
The determination means may determine that the previous adjustment value is used when the elapsed time from the time when the adjustment value calculation means calculated the previous adjustment value is less than or equal to a predetermined time.
The determination means determines that the previous adjustment value is used when the difference between the temperature when the adjustment value calculation means calculates the previous adjustment value and the current temperature is equal to or less than a predetermined value. Also good.
The determination unit may determine that a new adjustment value is used when the current temperature is outside a predetermined temperature range.
The calculation of the shake correction control means adjustment value by the adjustment value calculation means includes a first calculation procedure and a second calculation procedure, and the determination means makes a determination based on the calculation result of the first calculation procedure by the calculation means. You may make it perform.
If the determination means determines that the previous adjustment value is used, the adjustment value calculation means does not calculate a new adjustment value without executing the second calculation procedure, and the determination means does not use the previous adjustment value. If it is determined, the second calculation procedure may be executed to calculate a new adjustment value.
When a new adjustment value is calculated by the adjustment value calculation unit, an adjustment value update unit that overwrites and saves the calculated new adjustment value as a shake correction control unit adjustment value in the storage unit may be further provided. .

  According to the present invention, when it is not necessary to calculate a new adjustment value, it is not necessary to execute a process for calculating a new adjustment value when the camera is turned on, so that the startup time of the camera can be shortened. .

  FIG. 1 is a block diagram illustrating a configuration of an embodiment of a camera according to the present embodiment. The camera 1 includes a lens unit 2, an image sensor 3, a correction lens drive unit 4, a correction lens position detection unit 5, a Yaw direction shake detection element 6, a Pitch direction shake detection element 7, a control unit 8, and an actuator. A drive unit 9, a diaphragm drive unit 10, a focus drive unit 11, an operation unit 12, and a temperature sensor 13 are provided.

  The lens unit 2 includes a plurality of optical lens groups, and includes a correction lens 2a as a correction optical system for correcting a shake (hand shake) of the main body of the camera 1. The correction lens 2a is moved in a direction intersecting the optical axis by a correction lens driving unit 4 to be described later, thereby correcting the imaging position of the subject image on the image sensor 3, that is, deflecting the subject image by the correction optical system. Thus, the imaging position of the subject image on the image sensor 3 is corrected to correct the image blur. As will be described later with reference to FIG. 2, the movement range (movable range) of the correction lens 2a is mechanically limited by a movable restriction frame. For example, a CCD or a CMOS is used as the image sensor 3, and the subject image formed by the lens unit 2 is captured to acquire an image.

  The correction lens driving unit 4 is controlled by the control unit 8 and performs the shake (image shake) correction by moving the correction lens 2a in the direction intersecting the optical axis. The correction lens position detection unit 5 detects the position of the correction lens 2a within the movable restriction frame. FIG. 2 shows a specific configuration example of the correction lens 2a, the correction lens driving unit 4, and the correction lens position detection unit 5.

  As shown in FIG. 2, the correction lens 2a is fixed to the lens frame 2b, and its movement range is limited by the movable limit frame 2c. In other words, the lens frame 2b can move within a movable range surrounded by the movable restriction frame 2c within a plane (on a plane perpendicular to the optical axis) perpendicular to the optical axis, as indicated by an arrow A. For example, when the distance from the lens frame 2b to the movable limit frame 2c is L (μm) (> 0), the L is the distance between the two sides, that is, a total range of 2L is the maximum movable range of the correction lens 2a.

  The correction lens drive unit (VCM) 4 includes a drive magnet 4a, a drive magnet yoke 4b, a coil 4c, and a coil yoke 4d. The drive magnet 4a and the drive magnet yoke 4b are integrated and fixed to the movable limit frame 2c, and the coil yoke 4d is also fixed to the movable limit frame 2c. The coil 4c is fixed to the lens frame 2b, which is a movable part, and is disposed so as to be sandwiched between the drive magnet 4a and the coil yoke 4d.

  In the correction lens driving unit (VCM) 4, by energizing the coil 4c, the correction lens 2a is moved in a direction intersecting the optical axis within the movable restriction frame 2c. Energization of the coil 4c is controlled by the control unit 8 described later. In practice, wiring for energizing the coil 4c is necessary, but this is omitted in FIG.

  The correction lens position detection unit 5 includes a position detection magnet 5a, a position detection yoke 5b, and a Hall element 5c. The position detection magnet 5a and the position detection yoke 5b are integrated and fixed to the lens frame 2b which is a movable part. The hall element 5c is fixed to the movable restriction frame 2c. The correction lens position detection unit 5 outputs the output voltage from the Hall element 5c to the control unit 8, and the control unit 8 corrects based on the output voltage value Vhout (V) from the correction lens position detection unit 5. The position of the lens 2a is detected.

  That is, in the correction lens position detection unit 5, there is a magnet center at which the magnetic field of the detectable position detection magnet 5a is zero at a position directly above the Hall element 5c. The control unit 8 sets the output voltage output from the Hall element 5c as a reference voltage when the magnetic field of the position detecting magnet 5a becomes zero in a state where a predetermined drive current is supplied to the Hall element 5c. Based on the difference between the output voltage output from the Hall element 5c and the reference voltage, the position of the position detection magnet 5a fixed to the lens frame 2b, that is, the position of the correction lens 2a is detected.

  The Yaw direction shake detection element 6 is a gyro for detecting yaw of the main body of the camera 1, that is, a lateral shake. The Pitch direction shake detection element 7 is a gyro for detecting pitching of the main body of the camera 1, that is, vertical direction shake. The Yaw direction shake detection element 6 and the Pitch direction shake detection element 7 output the respective detection results to the control unit 8.

  The control unit 8 includes a CPU, a memory, and other peripheral circuits. Note that the memory constituting the control unit 8 includes an SDRAM and a flash memory. The SDRAM is a volatile memory, and is used as a work memory for the CPU to develop a program when the program is executed or as a buffer memory for temporarily recording data. The flash memory is a non-volatile memory in which a program executed by the CPU and various parameters read when the program is executed are recorded.

  The control unit 8 calculates the shake amount of the main body of the camera 1 based on outputs from the Yaw direction shake detection element 6 and the Pitch direction shake detection element 7. Then, the control unit 8 performs shake correction by moving the correction lens 2a by a movement amount corresponding to the calculated shake amount in a direction in which the shake of the main body of the camera 1 is canceled. Specifically, when the control unit 8 determines that the shake of the main body of the camera 1 has occurred based on the calculated shake amount of the main body of the camera 1, the control unit 8 is based on the output from the correction lens position detection unit 5. The current position of the correction lens 2a is detected.

  The control unit 8 controls the correction lens driving unit 4 according to a full-pressing operation of a release switch described later, and moves the correction lens 2a from the current position to the center in the movable limit frame 2c, that is, centering. Then, the control unit 8 controls the correction lens driving unit 4 to perform the shake correction by moving the correction lens 2a from the center in the movable restriction frame 2c by a movement amount corresponding to the shake amount in a direction to cancel the shake. The image signal is acquired by controlling the image sensor 3 and capturing an image of light input from the lens unit 2. The controller 8 controls the actuator by controlling the actuator driving unit 9 and driving the aperture driving unit 10 and the focus driving unit 11 at the time of shooting, thereby performing focusing.

  The operation unit 12 includes various operation members operated by the user, such as a power button, a release switch, a zoom button, a cross key, an enter button, a play button, and a delete button. The temperature sensor 13 is a center for measuring the temperature inside the main body of the camera 1. In the present embodiment, the Hall element 5c constituting the correction lens position detection unit 5 is easily affected by temperature, and the detection result changes with temperature change. Therefore, the temperature sensor 13 is located near the Hall element 5c. The temperature in the vicinity of the Hall element 5c can be measured.

  In the camera 1 having such a shake correction function, the Hall element 5c is easily affected by the temperature as described above. Therefore, the camera maker predetermines a predetermined value in an environment of room temperature, for example, 25 degrees before shipping the product. The correction lens 2a is driven in a sequence, and adjustment (shipment adjustment) for determining the detection accuracy and detection range of the correction lens position detection unit 5 is performed. Specifically, the control unit 8 controls the correction lens driving unit 4 to move the correction lens 2a, and sets the above-described magnet center where the magnetic field of the position detection magnet 5a becomes zero as the center position in the movable restriction frame 2c. And is recorded in a memory (not shown).

  Further, the control unit 8 controls the correction lens driving unit 4 to move the correction lens 2a to the end points in the lateral direction (X-axis direction), that is, the right end and the left end of the movable restriction frame 2c, and corrects at the respective correction lens positions. An output voltage Vhout (V) output from the lens position detector 5 is acquired. Then, the acquired output voltage (positive value) at the right end and output voltage (negative value) at the left end are recorded in a memory (not shown) as a possible range of the output voltage Vhout in the X-axis direction. In the present embodiment, this process is called a calibration operation process in the X-axis direction.

  Similarly, the control unit 8 controls the correction lens driving unit 4 to move the correction lens 2a to the end points in the vertical direction (Y-axis direction), that is, to the upper end and the lower end of the movable restriction frame 2c, and at each correction lens position. An output voltage Vhout (V) output from the correction lens position detector 5 is acquired. Then, the obtained output voltage (positive value) at the upper end and output voltage (negative value) at the lower end are recorded in a memory (not shown) as a possible range of the output voltage Vhout in the Y-axis direction. In the present embodiment, this process is referred to as a Y-axis direction calibration operation process. Further, other control parameters necessary for shake correction are also set at the time of shipment adjustment and recorded in the memory.

  Since the shipment adjustment before shipment is performed at room temperature as described above, when the user uses the camera 1 in the hot summer season or the cold winter season, the Hall element 5c is affected by the temperature. If shake correction is performed using data recorded in the memory by shipping adjustment, the accuracy of shake correction may be reduced. Therefore, in the camera 1 according to the present embodiment, the control unit 8 adjusts to determine the detection accuracy and the detection range of the correction lens position detection unit 5 again when the camera 1 is turned on by the user. Processing is performed to set control parameters according to the usage environment.

  In the present embodiment, when the camera 1 is turned on by the user, that is, when the camera 1 is started, the control unit 8 sets control parameters used for shake correction (calibration operation processing). I do. As described above, when the calibration operation process is performed when the camera 1 is activated, it takes time until the user can use the camera 1 after the user turns on the power of the camera 1. On the other hand, when the ambient temperature does not change or is small, when the Hall element 5c is not affected by the temperature change and the control parameter does not need to be adjusted, it is not always necessary to perform the calibration operation process. .

  Therefore, in the present embodiment, the control unit 8 determines whether or not it is necessary to execute the calibration operation process at the timing when the calibration operation process described above is performed, and only when it is determined that the calibration operation process is necessary. Do the operation process. As a result, when it is not necessary to execute the calibration operation process, the startup time of the camera 1 can be shortened by not performing the calibration operation process.

  For example, the control unit 8 records the time when the power source of the camera 1 is turned off in a flash memory, and when the power source of the camera 1 is turned on, based on the time at that time, the power source of the camera 1 was previously turned on. Calculate the elapsed time since it was turned off. If the elapsed time from the previous power-off is a predetermined time, for example, 60 minutes or less, it is determined that the calibration operation process is not necessary. This is because if the time has not passed since the last power-off, it is highly possible that the previously set control parameter can be used without performing the calibration operation process again. On the other hand, the control unit 8 determines that the calibration operation process needs to be executed when the elapsed time from the previous power-off is longer than the predetermined time.

  Even if the elapsed time from the previous power-off is less than the predetermined time, as described above, the Hall element 5c is easily affected by the temperature. It is necessary to perform a calibration operation process according to the temperature at that time. Therefore, the control unit 8 determines whether or not a calibration operation process needs to be performed when the camera 1 is activated based on the temperature measurement result acquired from the temperature sensor 13 when the camera 1 is activated.

  Specifically, the control unit 8 determines that it is necessary to execute the calibration operation process when the temperature when the camera 1 is turned on is lower than a predetermined temperature, or when the temperature is higher than the predetermined temperature. To do. The temperature at which the calibration operation process is determined to be necessary at this time is determined based on the compensation temperature range set by the camera manufacturer as the product specifications of the camera 1. The compensation temperature range is set based on a temperature performance range set at the time of design as a temperature at which the performance of the camera 1 can be exhibited. In the present embodiment, the temperature performance range of the camera 1 is −10 ° C. or higher and lower than 50 ° C., and the compensation temperature range is 0 ° C. or higher and lower than 40 ° C.

  In this case, the control unit 8 determines that it is not necessary to execute the calibration operation process when the temperature when the camera 1 is turned on is within the compensation temperature range of the camera 1. On the other hand, the control unit 8 calibrates when the temperature when the camera 1 is turned on is outside the compensation temperature range of the camera 1, that is, when it is less than 0 ° C. or 40 ° C. or more. It is determined that the execution of the operation process is necessary. As a result, even when the elapsed time from the previous power-off is short, if the temperature detected by the temperature sensor 13 is outside the compensation temperature range of the camera 1, the calibration operation process is executed to correct the shake correction. Accuracy can be improved.

  Further, the control unit 8 records the measurement result by the temperature sensor 13 in the flash memory when the power of the camera 1 is turned off. When the power source of the camera 1 is turned on, the control unit 8 calculates a temperature difference between when the power source of the camera 1 was last turned off and the current time based on the measurement result by the temperature sensor 13 at that time. .

  When the temperature difference between the previous power-off temperature and the current temperature is a predetermined value, for example, 5 ° C. or less, it is determined that the execution of the calibration operation process is unnecessary. In contrast, when the temperature difference between the previous power-off temperature and the current temperature is greater than a predetermined value, the control unit 8 determines that the calibration operation process needs to be executed. Thus, the elapsed time from the previous power-off is short, and even if the current temperature of the camera 1 is within the compensation temperature range of the camera 1, the temperature difference from the temperature at the previous power-off is large. In this case, the calibration operation process can be executed to ensure the accuracy of shake correction.

  When executing the calibration operation process based on the above determination, the control unit 8 records the time at that time and the temperature of the camera 1 in the flash memory. Then, the control unit 8 determines whether or not it is necessary to execute the calibration operation process even when photographing is performed based on the release operation by the user, and when it is determined that the calibration operation is necessary, the calibration operation is performed. Process.

  Specifically, the control unit 8 acquires the temperature of the camera 1 at the time of shooting from the temperature sensor 13, and determines whether or not the acquired temperature is within the compensation temperature range of the camera 1. When the temperature of the camera 1 is within the compensation temperature range of the camera 1, the control unit 8 determines that the execution of the calibration operation process is unnecessary. On the other hand, when the temperature of the camera 1 is outside the compensation temperature range of the camera 1, the control unit 8 determines that the calibration operation process needs to be executed. In addition, even when the control unit 8 is within the compensation temperature range of the camera 1, the temperature of the camera 1 and the temperature of the camera 1 at the time of the previous calibration operation processing recorded in the flash memory If the difference is greater than the predetermined value, it is determined that the calibration operation process needs to be executed.

  Hereinafter, the calibration operation process (control parameter setting process) by the control unit 8 will be described with reference to FIGS. 3 and 4. FIG. 3A shows the position (horizontal axis) of the correction lens 2a in the horizontal direction (X-axis direction) and the output from the correction lens position detector 5 when the correction lens 2a is moved to perform the calibration operation. It is the figure which showed the relationship with a voltage (correction lens position detection circuit output Vhout / unit: V) (vertical axis).

  FIG. 3B is a diagram schematically showing the movement of the correction lens 2a within the movable restriction frame 2c when the correction lens 2a is moved to perform a calibration operation. That is, the control unit 8 controls the correction lens driving unit 4 to perform the calibration operation, and moves the correction lens 2a within the movable restriction frame 2b as shown in FIG. With the movement, the output voltage from the correction lens position detector 5 changes as shown in FIG.

  FIG. 4 shows the correction lens position LR with respect to the correction lens target position LC, the correction lens position detection circuit output Vhout (V), the offset voltage adjustment signal Vh_offset (V), and the Hall element drive current adjustment signal voltage Vhi when the calibration operation process is executed. It is a figure showing the time series change of (V). In addition, the codes | symbols 1-20 which show each time point in FIG. 4 respond | correspond to the codes | symbols 1-20 shown in the figure of Fig.3 (a) and (b). For example, at the time point 1 in FIG. 4, the correction lens 2a is in the position indicated by points 1 to 3 in FIG. 3B, and the correction lens position detection circuit output Vhout at that time is the point in FIG. The correction lens position detection circuit output Vhout in 1 to 3 is obtained.

  Hereinafter, details of the process will be described for each time point. In the example shown in FIGS. 3 and 4, the processing at the time points 1 to 20 indicates the above-described calibration operation processing in the X-axis direction. In the calibration operation process, as described above, after performing the calibration operation process in the X-axis direction, the calibration operation process in the Y-axis direction is performed. Will be described, and the description of the calibration operation process in the Y-axis direction will be omitted. In particular, in the following, processing up to time point 13 when control parameters such as the hall element drive current adjustment signal voltage Vhi (V) in the X-axis direction are determined by the calibration operation processing in the X-axis direction will be described in detail.

(A) Processing at time points 1 and 2 At time points 1 and 2, the control unit 8 starts detecting the position of the correction lens 2a. Specifically, the control unit 8 sets the Hall element drive current adjustment signal voltage Vhi of both axes (X axis and Y axis) to the adjustment value Vhi0 (V), and sets the offset voltage adjustment signal Vh_offset to the adjustment value Vh_offset0 (V ). Then, the position detection γ value Kγ of the correction lens 2a on both axes is set to the adjustment value Kγ0 (mm / V), the position shift value Ks of the correction lens 2a is set to the adjustment value Ks0 (V), and the correction lens position is set. Detection of the position of the correction lens 2a by the detector 5 is started. As a result, the position of the correction lens 2a can be detected with an accuracy that does not hinder the operation calibration process.

  In the operation calibration process, as described above, the calibration operation process in the Y-axis direction is performed after the calibration operation process in the X-axis direction. In this case, in the calibration operation processing performed in the X-axis direction, the Hall element drive current adjustment signal voltage Vhi, the offset voltage adjustment signal Vh_offset, the position detection γ value Kγ of the correction lens 2a, and the position of the correction lens 2a are performed. The shift value Ks has already been adjusted. For this reason, in the calibration operation process in the Y-axis direction performed later, it is preferable to use values that have already been adjusted by the calibration operation process in the X-axis direction as these values.

(B) Processing at Times 3 to 4 At time 3, at time points 1 and 2, the Hall element drive current adjustment signal voltage Vhi is set to the adjustment value Vhi0 (V), and the offset voltage adjustment signal Vh_offset is set to the adjustment value Vh_offset0 (V). The time Th10 (sec) until at least the output of the correction lens position detector 5 is stabilized after the setting is set.

  At this point in time 3 to 4, the control unit 8 controls the correction lens driving unit 4 to move the correction lens 2a to the center (movable center / LC = 0) in the movable limit frame 2c which is a preset reference position. Move. Note that, as described above, this movable center is a central position in the movable restriction frame 2c that is specified by shipping adjustment before shipment from the factory and recorded in the memory. Specifically, at the time point 3, the control unit 8 controls the correction lens driving unit 4 to drive the correction lens 2a to the movable center at a predetermined speed ΔLCh0 (mm / sec) on both axes.

That is, the control unit 8 controls the correction lens driving unit 4 so that the position of the correction lens 2a on both axes is the correction lens target position LC (mm) calculated by the following equation (1). 2a is changed from the current correction lens position LR0 (mm) toward the movable center with a constant inclination. When the correction lens target position LC reaches the movable center, the correction lens target position LC is fixed at that position. Thus, the control unit 8 can move the correction lens 2a toward the movable center at a constant moving speed.
Correction lens target position LC = LR0 ± ΔLCh0 × t (1)

  In equation (1), t represents the elapsed time (sec) when the current time is 0. Further, the sign (+ or −) of ΔLCh0 is determined so that the correction lens target position LC is directed toward the movable center. The predetermined speed ΔLCh0 is slower than the maximum moving speed at which the correction lens driving unit 4 can drive the correction lens 2a, and is set in advance and recorded in the memory at the time of shipping adjustment described above. As a specific set value of ΔLCh0, a speed at which no contact sound is generated when the correction lens 2a is brought into contact with both ends of the movable restriction frame 2c in the process described later is set. For example, when the maximum speed at which the correction lens driving unit 4 can drive the correction lens 2a is 60 μmm / msec, ΔLCh0 is set to 15 μmm / msec.

After the correction lens 2a is positioned at the movable center by this process, the correction lens 2a is driven while the correction lens 2a is controlled and driven to the correction lens target position LC until the calibration operation process is completed. The amount is limited to a limit value Dh_limit0 (%) or less as shown in the following equation (2). Note that Dh_limit0 is preset and recorded in the memory at the time of shipping adjustment described above.
Correction lens drive amount ≦ ± Dh_limit0 (2)

(C) Processing at Time 4 to Time 5 At time 4, at least a time Th <b> 11 (sec) from the start of driving the correction lens 2 a to the movable center at time 3 until the correction lens reaches the vicinity of the movable center has elapsed. It is time. At this time point 4-5, the control unit 8 controls the correction lens driving unit 4 to bring the correction lens 2a into contact (press) with the negative end (movable end) of the movable restriction frame 2c, that is, the left end.

  Specifically, at the time point 4, the control unit 8 fixes the correction lens target position LC of the non-adjustment axis (Y axis) to the movable center. Further, the correction lens 2a is moved to the correction lens target position LC while changing the correction lens target position LC of the adjusted axis (X axis) from the current position of the correction lens 2a to the movable-end direction with a certain inclination. I will let you. Here, the constant inclination means an inclination such that the moving speed of the correction lens 2a becomes the above-described constant moving speed ΔLCh0 (mm / sec). At this time, even if the correction lens target position LC in the adjusted axis direction reaches the movable end, the control unit 8 keeps changing the correction lens 2a as it is to be surely pressed against the movable end.

That is, the control unit 8 sets the correction lens target position LC of the non-adjusted axis to 0, sets the initial value of the correction lens target position LC of the adjusted axis to the current LC, and corrects the correction lens target position LC of the adjusted axis. Is changed as shown in the following equation (3).
Correction lens target position LC (mm) of the adjusted axis = current LC−ΔLCh0 × t (3)
In Equation (3), t represents the elapsed time (sec) when the current time is 0.

(D) Processing at Times 5 to 6 At time 5, at least a time Th <b> 12 (sec) from the start of driving the correction lens 2 a to the movable end at the time 4 until the correction lens 2 a reaches the movable end. Is the time when At this time 5 to 6, the Hall element drive current adjustment signal voltage Vhi and the offset voltage adjustment signal Vh_offset are changed. Specifically, the control unit 8 stops the control of the correction lens 2a of the adjusted axis, and fixes the drive amount of the correction lens 2a to the limit value −Dh_limit0 (%). The limit of the driving amount of the correction lens 2a is expressed by the above-described equation (2). Here, since the correction lens 2a is in contact with the movable end, the sign of Dh_limit0 in the equation (2) is − and Become.

Further, the control unit 8 does not saturate the output value (correction lens position detection circuit output Vhout) from the correction lens position detection unit 5 when the correction lens 2a is moved to the movable + end (right end) in the process described later. Thus, the Hall element drive current adjustment signal voltage Vhi of the adjusted shaft is changed as shown in the following equation (4).
Hall element drive current adjustment signal voltage Vhi (V) = Khi2 × current Vhi (4)
Here, Khi2 is a Hall element drive current reduction rate (times) calculated in advance at the time of the shipping adjustment described above and recorded in the memory, and its possible range is 0 <Khi2 <1.

(E) Processing at time points 6 to 7 ′ At time point 6, after changing the hall element drive current adjustment signal voltage Vhi of the adjusted shaft at time point 5, at least the output from the correction lens position detection unit 5 is stabilized. This is the time when the time Th10 (sec) has elapsed. At this point in time 6 to 7 ′, the control unit 8 operates the offset voltage adjustment signal Vh_offset (V) of the adjusted axis to change the correction lens position detection circuit output Vhout (V) to a predetermined matching voltage VhadjH ( V) or VhadjL (V). Note that whether to set the correction lens position detection circuit output Vhout to VhadjH or VhadjL is determined as follows.

  That is, if the adjustment value Kγ0 set as the position detection γ value Kγ of the correction lens 2a is a positive value (+), it is set to VhadjH. As a result, the correction lens position detection circuit output Vhout when the correction lens 2a is driven in the negative direction can be reduced. On the other hand, if the adjustment value Kγ0 set as the position detection γ value Kγ of the correction lens 2a is a negative value (−), it is set to VhadjL. Thereby, the correction lens position detection circuit output Vhout when the correction lens 2a is driven in the negative direction can be increased.

Specifically, when the control unit 8 performs the operation of the offset voltage adjustment signal Vh_offset of the adjusted axis n times (n = 0 to 9) with a predetermined interval Th13 (sec) or more, the following formula ( The offset voltage adjustment signal Vh_offset of the nth adjusted axis is operated by 5) and (6). That is, the nth adjusted axis offset voltage adjustment signal Vh_offset is changed by the following equations (5) and (6).
Vh_offset (0) = (1/2 ¹ ) × Vref_offset (5)
Vh_offset (n) = Vh_offset (n−1) ± (1/2 ^{(n + 1)} ) × Vref_offset (6)

  In equations (5) and (6), Vref_offset (V) is a reference voltage of the D / A converter for the offset adjustment signal. In addition, the sign of ± in the expression (6) is + when Vhout is equal to or higher than the above-mentioned matching voltage VhadjH (V) or VhadjL (V), and is − otherwise.

(F) Processing at time point 8 Time point 8 is a time point at which a predetermined time Th13 (sec) has elapsed since time point 7 'when the offset voltage adjustment signal Vh_offset was last operated. At this time point 8, the control unit 8 first checks the output voltage of the adjusted axis of the correction lens position detection unit 5 and sets this as Vhout−. Next, since the Hall element drive current adjustment signal voltage Vhi is changed at time 5, the position detection γ value Kγ of the correction lens 2a and the position shift value Ks of the correction lens 2a change. Recalculate them according to (8).

Kγ (V) = Kγ0 / Khi2 (7)
Ks (V) = (Vhout −) + (LRrange / Kγ calculated by equation (7)) (8)
In Equation (7), Khi2 is the Hall element drive current reduction rate (times / 0 <Khi2 <1) as described above in Equation (4), which is calculated in advance at the time of shipping adjustment, Is recorded. In addition, LRrange in Expression (8) is the size (mm) of the correction lens movable range.

(G) Processing at time points 8 to 9 At time points 8 to 9, the control unit 8 controls the correction lens driving unit 4 to move the correction lens 2a to the + end (movable + end) of the movable restriction frame 2c, that is, the right end. To touch (press). That is, the control unit 8 fixes the correction lens target position LC of the non-adjustment axis (Y axis) to the movable center. Further, the correction lens 2a is moved to the correction lens target position LC while changing the correction lens target position LC of the adjusted axis (X axis) from the current position of the correction lens 2a to the movable + end direction with a certain inclination. I will let you.

  Here, the constant inclination means an inclination such that the moving speed of the correction lens 2a becomes the above-described constant moving speed ΔLCh0 (mm / sec). At this time, even when the correction lens target position LC in the adjusted axis direction reaches the movable + end, the control unit 8 keeps changing the correction lens 2a as it is to be surely pressed against the movable + end.

That is, the control unit 8 sets the correction lens target position LC of the non-adjusted axis to 0, sets the initial value of the correction lens target position LC of the adjusted axis to the current correction lens position LR0, and sets the adjusted axis target position LC of the adjusted axis. The correction lens target position LC is changed as shown in the following equation (9).
Correction lens target position LC (mm) of the axis to be adjusted = LR0 + ΔLCh0 × t (9)
In equation (9), t represents the elapsed time (sec) when the current time is 0. LR0 represents the current correction lens position (mm).

(H) Processing at time point 9 Time point 9 is a point in time when Th14 (sec) has elapsed since at least the correction lens 2a was brought into contact with the movable + end at time point 8 until the position of the correction lens 2a is stabilized. At this time 9, the control unit 8 confirms the output voltage of the adjusted axis of the correction lens position detection unit 5, sets this to Vhout +, stops the control of the correction lens 2 a of the adjusted axis, and controls the correction lens 2 a. The driving amount is fixed to the limit value + Dh_limit0 (%). The limit of the driving amount of the correction lens 2a is expressed by the above-described equation (2). Here, since the correction lens 2a is in contact with the movable + end, the sign of Dh_limit0 in the equation (2) is +. Become.

Next, the control unit 8 confirms the output voltage Vhout- of the correction lens position detection unit 5 of the adjusted axis when the correction lens 2a is brought into contact with the movable end, which is confirmed at the time point 8, and the time point 9. Based on the output voltage Vhout + of the correction lens position detection unit 5 of the adjusted axis when the correction lens 2a is moved to the movable + end side, the optimum value of the Hall element drive current adjustment signal voltage Vhi of the adjusted axis is determined. It calculates with following Formula (10).
Vhi (V) = current Vhi × ((VhadjH−VhadjL) / | (Vhout +) − (Vhout−) |) (10)

  Then, the control unit 8 drives the adjusted hall element 5c with the drive current adjusted by the hall element drive current adjustment signal voltage Vhi calculated by the equation (10). At this time, the control unit 8 limits the Hall element drive current adjustment signal voltage Vhi for driving the Hall element 5c to a range of + 1 ≦ Vhi ≦ Vhi_limit. In addition, the range which Vhi_limit which is an upper limit can take is 1-255. Further, VhadjH (V) and VhadjL (V) are adjustment voltages of the correction lens position detection circuit output Vhout described above in (e).

(I) Processing at Times 10 to 11 ′ Time 10 is a time when at least a predetermined time Th10 has elapsed since the Hall element drive current adjustment signal voltage Vhi was calculated at time 9. At this time point 10, the control unit 8 operates the offset voltage adjustment signal Vh_offset (V) of the adjusted axis to change the correction lens position detection circuit output Vhout to a predetermined adjustment voltage VhadjH (V) or VhadjL (V ) To adjust. Whether the offset voltage adjustment signal Vh_offset is set to VhadjH or VhadjL is confirmed at time 8 of the correction lens position detection unit 5 of the adjusted axis when the correction lens 2a is brought into contact with the movable end. Based on the output voltage Vhout− and the output voltage Vhout + of the correction lens position detection unit 5 of the adjusted axis when the correction lens 2a is brought into contact with the movable + end side, which is confirmed at time 9, it is determined as follows. To do.

  That is, if Vhout + is equal to or higher than Vhout− (Vhout− ≦ Vhout +), the control unit 8 adjusts the correction lens position detection circuit output Vhout to the combined voltage VhadjH (V). On the other hand, if Vhout + is less than Vhout− (Vhout−> Vhout +), the correction lens position detection circuit output Vhout is adjusted to the combined voltage VhadjL (V). Note that the adjustment method of the offset voltage adjustment signal Vh_offset (V) of the adjusted axis is the same as the method described above in (e), and thus the description thereof is omitted.

(J) Processing at Time 12 Time 12 is the time when at least a predetermined time Th13 (sec) has elapsed since time 11 ′ when the offset voltage adjustment signal Vh_offset was last operated. At this time point 12, the control unit 8 first checks the output voltage of the adjusted axis of the correction lens position detection unit 5 and sets this as Vhout +. Next, since the Hall element drive current adjustment signal voltage Vhi is changed at time 9, the position detection γ value Kγ of the correction lens 2a and the position shift value Ks of the correction lens 2a change. These are recalculated by (12).
Kγ (V) = (Vhi at time 8 / current Vhi) × current Kγ (11)
Ks (V) = (Vhout +) − (LRrange / Kγ calculated by equation (11)) (12)
In the equation (12), LRrange is the size (mm) of the correction lens movable range.

(K) Processing at time points 12 to 13 At time points 12 to 13, the control unit 8 controls the correction lens driving unit 4 to bring the correction lens 2a into contact with the movable end (press). Specifically, at the time point 4, the control unit 8 fixes the correction lens target position LC of the non-adjustment axis (Y axis) to the movable center. Further, the correction lens 2a is moved to the correction lens target position LC while changing the correction lens target position LC of the adjusted axis (X axis) from the current position of the correction lens 2a to the movable-end direction with a certain inclination. I will let you.

  Here, the constant inclination means an inclination such that the moving speed of the correction lens 2a becomes the above-described constant moving speed ΔLCh0 (mm / sec). At this time, even if the correction lens target position LC in the adjusted axis direction reaches the movable end, the control unit 8 keeps changing the correction lens 2a as it is to be surely pressed against the movable end.

That is, the control unit 8 sets the correction lens target position LC of the non-adjusted axis to 0, sets the initial value of the correction lens target position LC of the adjusted axis to the current correction lens position LR0, and sets the adjusted axis target position LC of the adjusted axis. The correction lens target position LC is changed as shown in the following equation (13).
Correction lens target position LC (mm) of the axis to be adjusted = LR0−ΔLCh0 × t (13)
In equation (13), t represents the elapsed time (sec) when the current time is 0.

(L) Processing at time point 13 At time point 13, since driving of the correction lens 2 a to the movable end is started at time point 12, at least the correction lens 2 a comes into contact with the movable end, and the position of the correction lens 2 a is stabilized. This is the time when a predetermined time Th14 has elapsed. At this time point 13, the control unit 8 confirms the output voltage of the adjusted axis of the correction lens position detection unit 5, sets this to Vhout−, stops the control of the correction lens 2 a of the adjusted axis, and controls the correction lens 2 a. The driving amount is fixed to the limit value −Dh_limit0 (%). The limit of the driving amount of the correction lens 2a is expressed by the above-described equation (2). Here, since the correction lens 2a is in contact with the movable end, the sign of Dh_limit0 in the equation (2) is − and Become.

Next, the control unit 8 confirms the output voltage Vhout + of the correction lens position detection unit 5 of the adjusted axis when the correction lens 2a is brought into contact with the movable + end side, which is confirmed at the time point 12, and the time point 13. Based on the output voltage Vhout- of the correction lens position detector 5 of the adjusted shaft when the correction lens 2a is moved to the movable end side, the position detection γ value Kγ of the correction lens 2a and the position of the correction lens 2a The shift value Ks is calculated by the following equations (14) and (15), respectively.
Kγ (V) = 2LRrange / ((Vhout +) − (Vhout−)) (14)
Ks (V) = ((Vhout +) + (Vhout −)) / 2 (15)
In the equation (14), LRrange is the size (mm) of the correction lens movable range.

  By the calibration operation process in the X-axis direction described above, the control unit 8 uses the offset voltage adjustment signal Vh_offset (X) in the X-axis direction and the Hall element drive in the X-axis direction as control parameters when correcting the shake in the X-axis direction. The current adjustment signal voltage Vhi (X) can be set. The control unit 8 records the set offset voltage adjustment signal Vh_offset (X) in the X-axis direction and hall element drive current adjustment signal voltage Vhi (X) in the X-axis direction in the flash memory.

  Note that the control unit 8 performs the same processing in the Y-axis direction, thereby controlling the offset voltage adjustment signal Vh_offset (Y) in the Y-axis direction and the hall in the Y-axis direction as control parameters for blur correction in the Y-axis direction. The element drive current adjustment signal voltage Vhi (Y) can be set and recorded in the flash memory.

  In the present embodiment, the control unit 8 calculates the shake in the X-axis direction at the time when the control parameter at the time of shake correction in the X-axis direction is calculated by the calibration operation process in the X-axis direction, for example, at the time 12 shown in FIG. The control parameter at the time of correction is compared with the control parameter at the time of shake correction in the X-axis direction that was set at the previous power-off and recorded in the flash memory. As a result, if the difference between the previous control parameter and the current control parameter is less than a predetermined percentage, the control unit 8 determines that the change in the control parameter between the previous power-off and this time is small. Thus, the subsequent calibration operation processing is not performed.

  In the present embodiment, the control unit 8 performs the control parameter comparison process at time 12 shown in FIG. 4, and if the difference between the previous control parameter and the current control parameter is less than a predetermined percentage, The process after the next point 13 is not performed. Thus, based on the control parameter at the time of shake correction in the X-axis direction calculated by the calibration operation process in the X-axis direction, it is determined whether or not the subsequent processing is necessary. The calibration operation process in the Y-axis direction can be prevented from being executed. That is, when it is not necessary to perform the calibration operation process, the process can be interrupted without performing the entire procedure of the calibration operation process, and the waiting time for the process can be shortened.

  Specifically, the control unit 8 calculates the calculated Hall element drive current adjustment signal voltage Vhi (X) (r) and the offset voltage adjustment signal Vh_offset (X) (r) in the X-axis direction and the previous X-axis direction. The Hall element drive current adjustment signal voltage Vhi (X) (p) and the offset voltage adjustment signal Vh_offset (X) (p) are compared using the following equations (2) and (3). As a result, when either one of the following expressions (2) and (3) is satisfied, the control unit 8 executes the calibration operation process in the Y-axis direction and completes the calibration operation process. On the other hand, when neither of the following expressions (2) and (3) is satisfied, the control unit 8 does not execute the calibration operation process in the Y-axis direction.

(Vhi (X) (p) −Vhi (X) (r)) / Vhi (X) (p)> predetermined value (2)
(Vh_offset (X) (p) −Vh_offset (X) (r)) / Vh_offset (X) (p)> predetermined value (3)

  Note that the camera 1 in the present embodiment has a sleep mode in which the camera 1 is shifted to a power saving state when the operation unit 12 is not operated for a predetermined time by the user. The control unit 8 automatically turns off the power of the camera 1 when the operation unit 12 is not operated by the user for a predetermined time after the mode of the camera 1 shifts to the sleep mode.

  On the other hand, when the operation unit 12 is operated by the user for a predetermined time after the mode of the camera 1 shifts to the sleep mode, the control unit 8 moves the camera 1 from the sleep mode to normal shooting. Return to mode. As described above, when the camera 1 returns from the sleep mode, the control unit 8 uses the control parameters set in the previous calibration operation process recorded in the flash memory without performing the above-described calibration operation process. To correct shake. As a result, when the camera 1 returns from the sleep mode, it is not necessary to execute the calibration operation process, so that the return from the sleep mode can be speeded up.

  Further, as described above, the control unit 8 turns off the power of the camera 1 after a predetermined time has elapsed after shifting to the sleep mode. The camera 1 is also turned off when the power button included in the operation unit 12 is operated by the user. When the power of the camera 1 is turned off in this way, the control unit 8 executes the above-described calibration operation process, and the control parameter obtained as a result, that is, the offset voltage adjustment signal Vh_offset (X) in the X-axis direction, the X-axis direction Hall element drive current adjustment signal voltage Vhi (X), Y-axis direction offset voltage adjustment signal Vh_offset (Y), and Y-axis direction Hall element drive current adjustment signal voltage Vhi (Y) are recorded in the flash memory. The control unit 8 also records the time when the power is turned off and the temperature at that time in the flash memory. Thereby, the control unit 8 uses the information recorded in the flash memory as the information when the camera 1 was previously turned off when the camera 1 is turned on next time, and whether or not it is necessary to execute the calibration operation process. Can be judged.

  FIG. 5 is a flowchart showing processing of the camera 1 in the present embodiment. The process shown in FIG. 5 is executed by the control unit 8 as a program that starts when the camera 1 is turned on.

  In step S5, the control unit 8 resets the sleep timer Ts for measuring the time until shifting to the sleep mode, and proceeds to step S10. In step S10, the control unit 8 reads the previous power-off time Tp recorded in the flash memory, and proceeds to step S20. In step S20, the control unit 8 acquires the current time Tr, and proceeds to step S30. In step S30, the control unit 8 determines whether or not the difference between the current time Tr and the time Tp at the previous power-off time is equal to or less than a predetermined time. If a positive determination is made, the process proceeds to step S40.

  In step S40, the control parameters set by the previous calibration operation processing recorded in the flash memory, that is, the X-axis direction offset voltage adjustment signal Vh_offset (X) (p), the X-axis direction Hall element drive current adjustment signal. Read out voltage Vhi (X) (p), offset voltage adjustment signal Vh_offset (Y) (p) in Y-axis direction, and hall element drive current adjustment signal voltage Vhi (Y) (p) in Y-axis direction to correct for shake Set as a control parameter to use. Thereafter, the process proceeds to step S50.

  In step S50, the control unit 8 determines whether or not the power is turned off when the power button is pressed by the user. If a positive determination is made, the process proceeds to step S60. In step S60, the control unit 8 executes the above-described calibration operation process, that is, the calibration operation process in the X-axis direction and the calibration operation process in the Y-axis direction, and proceeds to step S70. In step S70, the control unit 8 records the control parameter calculated by the calibration operation process in the flash memory, and proceeds to step S80.

  In step S80, the control unit 8 measures the current temperature based on the output from the temperature sensor 13, and updates the temperature Tep at the previous power-off time recorded in the flash memory with the measured temperature. Thereafter, the process proceeds to step S90, where the control unit 8 acquires the current time, and updates the time Tp when the power was turned off last time recorded in the flash memory at the acquired time. Then, it progresses to step S91, the control part 8 performs the process for turning off the power supply of the camera 1, and complete | finishes a process.

  Next, processing when a negative determination is made in step S30 will be described. In this case, the process proceeds to step S100, and the control unit 8 reads the temperature Tep at the previous power-off time from the flash memory, and proceeds to step S110. In step S110, the control unit 8 measures the current temperature Ter based on the output from the temperature sensor 13, and proceeds to step S120. In step S120, the control unit 8 determines whether or not the current temperature Ter is within the compensation temperature range of the camera 1 described above. If a negative determination is made, the process proceeds to step S140 described later. On the other hand, if a positive determination is made, the process proceeds to step S130.

  In step S130, the control unit 8 determines whether or not the difference between the current temperature Tep and the temperature Ter at the previous power-off time is equal to or less than a predetermined value. If a positive determination is made, the process proceeds to step S40 described above. On the other hand, if a negative determination is made, the process proceeds to step S140. In step S140, the control unit 8 executes the above-described calibration operation process in the X-axis direction, and proceeds to step S150. In step S150, the control unit 8 determines the control parameter in the X-axis direction by executing the calibration operation process in the X-axis direction, and proceeds to step S160.

  In step S160, the controller 8 controls the current hall element drive current adjustment signal voltage Vhi (X) (r) in the X-axis direction and the previous hall element drive current adjustment signal voltage Vhi (X) (p) in the X-axis direction. ) Satisfies the above-described expression (2). If a positive determination is made, the process proceeds to step S180 described later. On the other hand, if a negative determination is made, the process proceeds to step S170. In step S170, the control unit 8 determines that the current offset voltage adjustment signal Vh_offset (X) (r) in the X-axis direction and the previous offset voltage adjustment signal Vh_offset (X) (p) in the X-axis direction are as described above. It is determined whether or not Expression (3) is satisfied. If a positive determination is made, the process proceeds to step S180. On the other hand, if a negative determination is made, the process proceeds to step S40 described above.

  In step S180, the control unit 8 executes the above-described calibration operation process in the Y-axis direction, and proceeds to step S190. In step S190, the control unit 8 determines the control parameter in the Y-axis direction by executing the calibration operation process in the Y-axis direction, and proceeds to step S200. In step S200, the current temperature is measured based on the output from the temperature sensor 13, and the temperature Tep recorded in the flash memory is updated with the measured temperature. Then, it progresses to step S50 mentioned above.

  Next, processing when a negative determination is made in step S50 will be described. In this case, the process proceeds to step S220, and the control unit 8 determines whether or not the release button included in the operation unit 12 has been pressed by the user. If the determination is affirmative, the process proceeds to step S221, and the control unit 8 resets the sleep timer Ts for measuring the time until the transition to the sleep mode, and then proceeds to step S230. In step S230, the control unit 8 performs the shooting process, and then proceeds to step S100 described above. On the other hand, if a negative determination is made in step S220, the process proceeds to step S240.

  In step S240, the control unit 8 determines whether or not the sleep timer Ts is equal to or greater than a predetermined value, that is, whether or not the operation unit 12 is not operated by the user for a predetermined time or longer. If a negative determination is made, the process returns to step S50. On the other hand, when an affirmative determination is made, the process proceeds to step S250, and the control unit 8 shifts the mode of the camera 1 to the sleep mode described above, and proceeds to step S260.

  In step S260, the control unit 8 determines whether or not a predetermined time has elapsed since the transition to the sleep mode. If an affirmative determination is made, the process proceeds to step S60 described above, and processing when the camera 1 is powered off is executed. On the other hand, if a negative determination is made in step S260, the process proceeds to step S270. In step S270, the control unit 8 determines whether any operation member included in the operation unit 12 has been operated by the user. If a negative determination is made, the process returns to step S260. On the other hand, if a positive determination is made, the process returns to step S40 described above. That is, when returning from the sleep mode, the control parameter set by the previous calibration operation process is read in step S40 without executing the calibration operation process again.

According to the present embodiment described above, the following operational effects can be obtained.
(1) The control unit 8 detects and drives the position of the correction lens 2a in order to correct the image blur on the image plane caused by the shake by the correction lens 2a as a correction optical system that makes the optical axis variable. A control parameter, which is a shake correction control means adjustment value indicating the operating condition of the lens 2a, is calculated, and the calculated control parameter is recorded in the flash memory. The control unit 8 uses a control parameter already recorded in the flash memory or a newly calculated control parameter as a control parameter for performing image blur correction when the camera 1 is turned on. The image blur is corrected using a control parameter based on the determination result. As a result, when it is not necessary to newly calculate a control parameter, the control unit 8 does not need to execute a process for calculating the control parameter when the camera is turned on, and thus the startup time of the camera is shortened. be able to. In addition, the power required for the process of calculating the control parameter is not consumed, and the battery life is extended.

(2) When the camera returns from the sleep mode, the control unit 8 uses the previous control parameter without performing the calibration operation process. This can speed up the return from the sleep mode.

(3) The control unit 8 determines whether or not to perform the calibration operation process even after taking a picture. This makes it possible to perform shake correction with an appropriate control parameter at the next shooting.

(4) When the elapsed time from the previous power-off to the power-on is equal to or shorter than the predetermined time, the control unit 8 uses the previous control parameter without executing the calibration operation process. As a result, when the time has not passed since the last power-off, it is highly possible that the shooting environment has not changed significantly, and it is possible to set control parameters according to the shooting environment. it can. Depending on the shooting environment when the camera 1 is activated, the activation of the camera 1 can be speeded up.

(5) When the difference between the previous power-off temperature and the current temperature is equal to or less than a predetermined value, the control unit 8 uses the previous control parameter without executing the calibration operation process. . As a result, when the temperature difference from the previous power-off temperature is small, the control parameter for operating the hall element 5c does not change, and the control parameter according to the shooting environment is set. Can do. Depending on the shooting environment when the camera 1 is activated, the activation of the camera 1 can be speeded up.

(6) When the current temperature is outside the compensation temperature range of the camera 1, the control unit 8 executes a calibration operation process and resets the control parameters. As a result, when the current temperature is outside the compensation temperature of the camera 1, the control parameters for operating the Hall element 5c can be reset to improve the accuracy of shake correction.

(7) The control unit 8 determines whether or not to execute the calibration operation process in the Y-axis direction based on the calculation result of the control parameter in the X-axis direction by the calibration operation process in the X-axis direction. Accordingly, even if the calibration operation process is not completed, it is possible to determine whether or not the calibration operation process needs to be performed to the end when the control parameter in the X-axis direction is calculated.

(8) When the control unit 8 determines that the calibration operation process is unnecessary as a result of the determination based on the calculation result of the control parameter in the X-axis direction, the control unit 8 does not execute the calibration operation process in the Y-axis direction. The control parameter was used. On the other hand, when it is determined that the calibration operation process is necessary, the calibration operation process in the Y-axis direction is executed and the newly calculated control parameter is used. Accordingly, when it is determined that it is not necessary to perform the calibration operation process based on the control parameter in the X-axis direction, the calibration operation process in the Y-axis direction can be omitted to speed up the process.

(9) The control unit 8 records the calculated control parameter in a flash memory that is a nonvolatile memory. Thus, even after the power of the camera 1 is turned off, it can be held as the previous control parameter, and the control unit 8 determines whether or not to perform the calibration operation process using the previous control parameter when the power is turned on next time. Can be determined.

-Modification-
The camera according to the above-described embodiment can be modified as follows.
(1) In the above-described embodiment, the example in which the camera 1 includes the photographing optical system 2 including the correction lens 2a as the correction optical system has been described. However, the camera 1 may be a camera to which an interchangeable lens having the photographing optical system 2 including the correction lens 2a is detachable, for example, a single-lens reflex camera. That is, the present invention can be applied to a camera system including a camera body and an interchangeable lens. In this case, the correction lens driving unit 4 and the correction lens position detection unit 5 are mounted on the photographing optical system 2 side, and the control unit 8 includes the correction lens driving unit 4 and the correction lens position detection unit 5 via the lens mount unit. Control. As a result, the control unit 8 can execute the above-described processing for each photographing optical system 2 even when the interchangeable lens attached to the camera 1 is replaced. Further, a control unit having the function of the control unit 8 may be arranged in the interchangeable lens. In addition, the camera system here should just be provided with the imaging | photography optical system and the image pick-up element, and is not restricted to a thing with which an interchangeable lens can be attached or detached like a single lens reflex camera.

(2) In the above-described embodiment, the blur correction lens 2a included in the photographing optical system 2 is used as a correction optical system, and the subject image is deflected by the correction optical system to correct the imaging position of the subject image on the image sensor 3. Thus, an example of correcting image blur has been described. However, the image pickup device 3 may be moved within a predetermined range to correct the image blur position of the subject image on the image pickup device to correct the image blur. When correcting the image blur by moving the image sensor 3, the correction lens 2a in the above-described embodiment may be replaced with the image sensor 3, and the calibration operation process may be performed. Thus, the present invention can also be applied to a camera that performs blur correction using a CCD drive system.

  Further, when the present invention is applied to a camera that performs CCD-driven blur correction, the camera 1 may be a single-lens reflex camera to which an interchangeable lens can be attached and detached, as in Modification (1). Also in this case, the correction lens driving unit 4 and the correction lens position detection unit 5 are mounted on the photographing optical system 2 side. The camera body of the camera 1 includes an image sensor 3, a Yaw direction shake detection element 6, a Pitch direction shake detection element 7, a control unit 8, an actuator drive unit 9, an aperture drive unit 10, and a focus drive unit. 11, an operation unit 12, and a temperature sensor 13 may be provided.

(3) In the above-described embodiment, when the difference between the temperature at the previous power-off time and the temperature at the power-on time is equal to or less than a predetermined value, the control unit 8 executes the calibration operation process. An example of determining that it is unnecessary has been described. However, since the calibration operation process is also performed in the manufacturing process before the camera 1 is shipped as described above, the temperature at the time of executing the calibration operation process in the manufacturing process is associated with the calculated control parameter and flashed. It may be recorded in a memory. Then, the control unit 8 may not execute the calibration operation process when the difference between the temperature when the power is turned on and the temperature when the calibration operation process is executed in the manufacturing process is equal to or less than a predetermined value.

  Note that the present invention is not limited to the configurations in the above-described embodiments as long as the characteristic functions of the present invention are not impaired. Moreover, it is good also as a structure which combined the above-mentioned embodiment and a some modification.

It is a block diagram which shows the structure of one Embodiment of a camera. FIG. 6 is a diagram schematically illustrating a specific configuration example of a correction lens 2a, a correction lens driving unit 4, and a correction lens position detection unit 5. The figure which shows the relationship between the position of the correction lens 2a in the X-axis direction and the output voltage from the correction lens position detector 5 in the control parameter calibration operation processing, and the correction lens 2a in the movable restriction frame 2c at the time of start-up adjustment FIG. It is a figure showing the time series change of various parameter values at the time of calibration operation processing execution. FIG. 6 is a flowchart showing processing of the camera 1.

Explanation of symbols

1 camera, 2 lens unit, 2a correction lens, 2b lens frame, 2c movable limit frame, 3 image sensor, 4 correction lens drive unit, 4a drive magnet, 4b drive magnet yoke, 4c coil, 4d coil yoke, 5 Correction lens position detection unit, 5a position detection magnet, 5b position detection yoke, 5c Hall element, 6 Yaw direction shake detection element, 7 Pitch direction shake detection element, 8 control unit, 9 actuator drive unit, 10 aperture drive unit, 11 Focus drive unit, 12 Operation unit, 13 Temperature sensor

Claims (18)

A shake correction unit configured to include at least one of a shake correction optical system capable of changing an optical axis and a movable image pickup unit, and corrects image shake on an image plane caused by shake;
Shake correction control means for detecting and driving the position of the shake correction means;
An adjustment value calculating means for calculating a shake correction control means adjustment value indicating an operating condition of the shake correction control means;
Storage means for storing the shake correction control means adjustment value;
When the camera is turned on, image blur correction is performed using the shake correction control unit adjustment value (previous adjustment value) that has been calculated by the adjustment value calculation unit and already stored in the storage unit, The adjustment value calculation unit newly calculates a shake correction control unit adjustment value, and determines whether to perform image blur correction using the newly calculated shake correction control unit adjustment value (new adjustment value). A determination means;
A camera system comprising: a process control unit that operates the shake correction control unit so as to perform image blur correction using the shake correction control unit adjustment value based on a determination result by the determination unit. The camera system according to claim 1,
The camera system according to claim 1, wherein the determination unit determines to use the previous adjustment value when the camera returns from the power saving state. The camera system according to claim 1,
The camera system according to claim 1, wherein the determination unit further performs the determination even after shooting. In the camera system according to any one of claims 1 to 3,
The determination unit determines that the previous adjustment value is used when an elapsed time from the time when the adjustment value calculation unit calculates the previous adjustment value is a predetermined time or less. system. In the camera system according to any one of claims 1 to 4,
The determination unit determines to use the previous adjustment value when the difference between the temperature at which the adjustment value calculation unit calculates the previous adjustment value and the current temperature is equal to or less than a predetermined value. A camera system characterized by In the camera system according to any one of claims 1 to 4,
The determination system determines that the new adjustment value is used when the current temperature is outside a predetermined temperature range. In the camera system according to any one of claims 1 to 6,
Calculation of the shake correction control means adjustment value by the adjustment value calculation means includes a first calculation procedure and a second calculation procedure,
The camera system according to claim 1, wherein the determination unit performs the determination based on a calculation result of the first calculation procedure by the calculation unit. The camera system according to claim 7,
If the determination means determines that the previous adjustment value is to be used, the adjustment value calculation means does not calculate the new adjustment value without executing the second calculation procedure, and the determination means When it is determined that the previous adjustment value is not used, the second adjustment procedure is executed to calculate the new adjustment value. In the camera system according to any one of claims 1 to 8,
When the new adjustment value is calculated by the adjustment value calculation means, the apparatus further comprises an adjustment value update means for overwriting and saving the calculated new adjustment value as the shake correction control means adjustment value in the storage means. A camera system characterized by A shake correction unit configured by a movable imaging unit and correcting image shake on an image plane caused by shake;
Shake correction control means for detecting and driving the position of the shake correction means;
An adjustment value calculating means for calculating a shake correction control means adjustment value indicating an operating condition of the shake correction control means;
Storage means for storing the shake correction control means adjustment value;
When the camera is turned on, image blur correction is performed using the shake correction control unit adjustment value (previous adjustment value) that has been calculated by the adjustment value calculation unit and already stored in the storage unit, Determine whether the adjustment value calculation unit newly calculates the shake correction control unit adjustment value and uses the newly calculated shake correction control unit adjustment value (new adjustment value) to correct image blur. Determination means to perform,
A camera body comprising: processing control means for operating the shake correction control means so as to correct image shake using the shake correction control means adjustment value based on a determination result by the determination means. The camera body according to claim 10,
The camera body according to claim 1, wherein the determination unit determines to use the previous adjustment value when the camera returns from the power saving state. The camera body according to claim 10,
The camera body according to claim 1, wherein the determination unit further performs the determination even after shooting. The camera body according to any one of claims 10 to 12,
The determination unit determines that the previous adjustment value is used when an elapsed time from the time when the adjustment value calculation unit calculates the previous adjustment value is a predetermined time or less. body. The camera body according to any one of claims 10 to 13,
The determination unit determines to use the previous adjustment value when the difference between the temperature at which the adjustment value calculation unit calculates the previous adjustment value and the current temperature is equal to or less than a predetermined value. A camera body characterized by The camera body according to any one of claims 10 to 13,
The camera body according to claim 1, wherein the determination unit determines to use the new adjustment value when the current temperature is outside a predetermined temperature range. The camera body according to any one of claims 10 to 15,
Calculation of the shake correction control means adjustment value by the adjustment value calculation means includes a first calculation procedure and a second calculation procedure,
The camera body according to claim 1, wherein the determination unit performs the determination based on a calculation result of the first calculation procedure by the calculation unit. The camera body according to claim 16, wherein
If the determination means determines that the previous adjustment value is to be used, the adjustment value calculation means does not calculate the new adjustment value without executing the second calculation procedure, and the determination means When it is determined that the previous adjustment value is not used, the second adjustment procedure is executed to calculate the new adjustment value. The camera body according to any one of claims 10 to 17,
When the new adjustment value is calculated by the adjustment value calculation means, the apparatus further comprises an adjustment value update means for overwriting and saving the calculated new adjustment value as the shake correction control means adjustment value in the storage means. A camera body characterized by

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