JP2008160277A - Vibration correction device, imaging apparatus using it, inspection method of vibration correction device and inspection system of vibration correction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the calibration work of a vibration correction device and to easily execute recalibration after shipping. <P>SOLUTION: The detected results of an angular rate sensor 10 of a digital camera 2 and an already calibrated external angular rate sensor are compared in a comparator circuit 43, and their phase difference and the difference of the maximum amplitudes are obtained from the waveform of the time-based change of the detected results of the angular rate sensor 10 and the external angular rate sensor. In a first calibration part 20, the setting value of the gain correction of the detected result of the angular rate sensor 10 is changed so that the phase difference and the difference of the maximum amplitudes obtained in the comparator circuit 43 become 0 or a stipulated value or less. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration correction apparatus that performs correction so as to cancel vibration according to a result of detecting vibration, an imaging apparatus using the same, an inspection method for the vibration correction apparatus, and an inspection system for the vibration correction apparatus.

  Recently, digital cameras with a so-called camera shake correction function for correcting image shake caused by camera shake at the time of shooting are commercially available. In such a digital camera, the shake amount of the camera body is detected by an angular velocity sensor such as a gyro, and the imaging lens and the CCD are mechanically displaced by an actuator so as to cancel the shake according to the detection result, or Camera shake correction is performed by electronically shifting the reading position of the image data.

  By the way, in a digital camera with a camera shake correction function, camera shake correction is performed correctly, for example, the actuator is not driven with a displacement amount corresponding to the shake amount detected by the angular velocity sensor due to performance variations caused by individual differences in angular velocity sensors and actuators. There was no case. For this reason, conventionally, performance variations of angular velocity sensors and actuators have been calibrated before shipment of the digital camera.

As a method of calibrating the performance variation of the angular velocity sensor and the actuator, for example, a digital camera is placed on a vibration table and vibrated while a subject on which a prescribed pattern is drawn is imaged, and the output level of the video signal ( A method has been proposed in which a high-frequency component peak information of a video signal is displayed on a monitor, and an operation member is operated while observing this to perform calibration (see Patent Document 1). In addition, a sine wave signal is supplied to the actuator to drive it, and the phase shift between the sine wave signal and the drive output of the actuator (a tilt signal indicating the attitude of the prism displaced by the actuator) is calculated. Based on this calculation result A method for compensating the output from the angular velocity sensor using the generated calibration data has been proposed (see Patent Document 2).
JP-A-8-006094 Japanese Patent Laid-Open No. 8-079998

  In the method described in Patent Document 1, since the calibration is performed by operating the operation member while observing the video, workability is poor and time is required. In addition, when recalibration is performed after shipment, there is a problem in that the digital camera must be brought into the factory facility where the vibration table is installed, which is inconvenient. Further, in this method, the performance variation of the angular velocity sensor with respect to vibration is calibrated, but the performance variation of the actuator cannot be calibrated.

  In the method described in Patent Document 2, the phase shift of the actuator drive output with respect to the sine wave signal can be calibrated without using a vibration table, but when calibrating the performance variation of the angular velocity sensor, As in the case of Patent Document 1, calibration must be performed using a vibration table, and the problem regarding recalibration after shipment cannot be solved.

  Here, problems related to post-shipment recalibration can be solved once a shake table is installed at the manufacturer's after-sales service base or retail store. However, there are new problems such as the cost of installing the shake table and space. It is difficult to say that it is a realistic solution.

  The present invention has been made in view of the above problems, a vibration correction device that can easily perform calibration work and can easily perform recalibration after shipment, and an imaging device using the same, An object of the present invention is to provide an inspection method for a vibration correction apparatus and an inspection system for the vibration correction apparatus.

  In order to achieve the above object, the invention described in claim 1 includes: a vibration detection unit that detects vibration; and a vibration correction unit that corrects the vibration so as to cancel out the vibration according to a detection result of the vibration detection unit. In the vibration correction apparatus, the vibration detection unit is calibrated based on a result of comparison between a detection result of the vibration detection unit and a detection result of a calibrated external vibration detection unit prepared separately from the vibration detection unit. The first calibration means is provided.

  The first calibration means is obtained from the temporal change waveforms of the detection results of the vibration detection means and the external vibration detection means, and the phase difference and the maximum amplitude difference are 0 or less than a specified value. It is preferable to do so.

  It is preferable to provide an external output means for outputting the detection result of the vibration detection means to the outside. Moreover, it is preferable to provide the 1st memory | storage means which memorize | stores the calibration result of said 1st calibration means.

  The vibration detection means and the external vibration detection means are composed of angular velocity sensors, and the detection results of the vibration detection means and the external vibration detection means are angles obtained by integrating angular velocity signals detected by the angular velocity sensor. It is preferable that the data is.

  Furthermore, a vibration signal generating means for generating a constant continuous vibration signal simulating the state of camera shake, and a comparison means for comparing the vibration signal and the drive output signal of the vibration correction means when the vibration signal is given. Preferably, the apparatus further comprises second calibration means for calibrating the vibration correction means based on the comparison result of the comparison means.

  In this case, the comparison means obtains the phase difference and the maximum amplitude difference from the vibration signal and the temporal change waveform of the drive output signal, and the second calibration means is the comparison means. It is preferable that the difference between the obtained phase difference and the maximum amplitude is 0 or less than a specified value. Moreover, it is preferable to provide the 2nd memory | storage means to memorize | store the calibration result of said 2nd calibration means.

  It is preferable to provide a process transition means for automatically shifting to the process of calibrating the vibration correcting means when a predetermined time has elapsed from the time of the previous calibration by the second calibration means. Alternatively, it is preferable to provide an operation input means for shifting to the process of calibrating the vibration correcting means.

  It is preferable that the vibration correcting unit includes an actuator, and the drive output signal is data on a displacement amount of a member to be displaced that is displaced by the actuator.

  A twelfth aspect of the present invention is an imaging apparatus, wherein the vibration correction device according to any one of the first to eleventh aspects is mounted, vibrations applied to the main body of the apparatus are detected by the vibration detection means, and the vibration correction is performed. The optical system is mechanically displaced by the means.

  According to a thirteenth aspect of the present invention, there is provided a vibration correction apparatus comprising: vibration detection means for detecting vibration; and vibration correction means for correcting the vibration so as to cancel out vibration according to the detection result of the vibration detection means. The vibration correcting apparatus is an inspection method for applying vibration to a calibrated external vibration detecting means prepared separately from the vibration detecting means and the vibration detecting means, the vibration detecting means, and A first comparison step for comparing detection results of the external vibration detection means and a first calibration step for calibrating the vibration detection means based on the comparison results of the first comparison step are provided.

  In the first comparison step, the phase difference and the maximum amplitude difference are obtained from the temporal change waveform of the detection result of the vibration detection unit and the external vibration detection unit. In the first calibration step, It is preferable that the difference between the phase difference and the maximum amplitude obtained in the first comparison step be 0 or less than a specified value.

  It is preferable to provide an external output step of outputting the detection result of the vibration detection means to the outside. Moreover, it is preferable to provide the 1st memory | storage process which memorize | stores the calibration result of said 1st calibration process.

  An angle obtained by integrating an angular velocity signal detected by the angular velocity sensor as a detection result of the vibration detecting unit and the external vibration detecting unit using an angular velocity sensor for the vibration detecting unit and the external vibration detecting unit. It is preferable to use this data.

  In the vibration step, it is preferable that a constant continuous vibration is applied to the vibration detection unit and the external vibration detection unit. Alternatively, in the vibration step, irregular vibration is given to the vibration detection means and the external vibration detection means, and in the first comparison step, the detection results of the vibration detection means and the external vibration detection means are It is preferable to extract a waveform having substantially the same shape from a temporally changing waveform, and obtain the phase difference and the maximum amplitude difference for the extracted waveform.

  Further, the vibration signal input step of giving a constant continuous vibration signal imitating the state of camera shake to the vibration correction means, and the second comparison for comparing the vibration signal and the drive output signal of the vibration correction means by the vibration signal Preferably, the method includes a step and a second calibration step for calibrating the vibration correcting means based on the comparison result of the second comparison step.

  In this case, in the second comparison step, the phase difference and the maximum amplitude difference are obtained from the temporal change waveforms of the vibration signal and the drive output signal. In the second calibration step, It is preferable that the difference between the phase difference and the maximum amplitude obtained in the two comparison steps be 0 or less than a specified value. Moreover, it is preferable to provide the 2nd memory | storage process which memorize | stores the calibration result of said 2nd calibration process.

  It is preferable to automatically shift to the process of calibrating the vibration correcting means when a predetermined time has elapsed from the time of the previous calibration in the second calibration step.

  It is preferable that an actuator is used for the vibration correction unit, and displacement amount data of a member to be displaced displaced by the actuator is used as the drive output signal.

  According to a twenty-fifth aspect of the present invention, there is provided a vibration correction apparatus comprising: vibration detection means for detecting vibration; and vibration correction means for correcting the vibration so as to cancel out vibration according to the detection result of the vibration detection means. The vibration correction apparatus inspection system according to claim 1, wherein the external vibration detection unit calibrated prepared separately from the vibration detection unit is compared with the detection results of the vibration detection unit and the external vibration detection unit. And the vibration detecting means is calibrated based on the comparison result of the comparing means.

  The comparison means obtains the phase difference and the maximum amplitude difference from the temporal change waveforms of the detection results of the vibration detection means and the external vibration detection means, and the calibration is obtained by the comparison means. It is preferable that the difference between the phase difference and the maximum amplitude is 0 or less than a specified value.

  It is preferable that a vibration means for applying a constant continuous vibration to the vibration detection means and the external vibration detection means is provided.

  According to the vibration correction device of the present invention, the imaging device using the same, the inspection method of the vibration correction device, and the inspection system of the vibration correction device, based on the comparison result with the detection result of the calibrated external vibration detection means. Since the vibration detecting means is calibrated, it is not necessary to perform calibration by operating the operating member while observing an image as in the prior art, and the calibration work can be easily performed. Moreover, since calibration can be performed without using a vibration table, recalibration after shipment can be easily performed.

  In FIG. 1, a digital camera 2 with a camera shake correction function corresponding to the imaging device of the present invention includes an angular velocity sensor 10 such as a gyro, a camera shake correction processing unit 11 configured by a microcomputer, and the like. The actuator 12 and the position detector 13 are provided.

  The angular velocity sensor 10 detects the angular velocity of shaking (pitching) around the left and right axes of the camera body 2a and shaking around the vertical axis (yawing) of the camera body 2a. An angular velocity signal (hereinafter, abbreviated as an angular velocity signal) Sa detected by the angular velocity sensor 10 is extracted from a frequency component of an arbitrary band by a band pass filter (not shown), and a DC cut filter (not shown). After the direct current component is removed, it is output to the terminal a of the changeover switch 14 of the camera shake correction processing unit 11.

  A sine wave output unit 15 and an A / D converter (hereinafter abbreviated as A / D) 16 are connected to terminals b and c of the changeover switch 14. The sine wave output unit 15 generates a continuous sine wave signal Sb having a constant frequency (for example, 10 Hz) simulating the state of camera shake, and outputs this to the terminal b of the changeover switch 14. Either the angular velocity signal Sa or the sine wave signal Sb is input to the A / D 16 from the terminals a and b through the terminal c. The A / D 16 converts the input angular velocity signal Sa or sine wave signal Sb into a digital signal and outputs it to the integration filter 17.

  The integration filter 17 integrates the angular velocity signal Sa or sine wave signal Sb digitally converted by the A / D 16 to obtain angle data about the left and right axes and the vertical axis of the camera body 2a (hereinafter referred to as sensor angle data). (Abbreviated) Da or simulated deflection angle data based on the sine wave signal Sb (hereinafter, abbreviated as sine wave angle data. The data and the sensor angle data may be collectively referred to simply as angle data D). ) Db is generated. The angle data D generated by the integration filter 17 is output to the gain correction circuit 18. The sine wave angle data Db is output to the comparison circuit 19.

  The gain correction circuit 18 is based on the phase values and gain values set in the first and second calibration sections (corresponding to the first and second calibration means and the first and second storage means) 20 and 21. Thus, the phase and gain of the angle data D from the integration filter 17 are corrected. The angle data D whose gain has been corrected by the gain correction circuit 18 is referred to as corrected angle data D ′. The correction angle data D ′ is D / A converted by a D / A converter (not shown) and then input to the actuator 12. Further, when the angular velocity sensor 10 to be described later is calibrated, the correction sensor angle data Da 'is input to the CPU 29 after gain correction.

  The actuator 12 is connected to a correction lens 23 included in a lens group such as the main lens 22. The correction lens 23 is rotatable about the left and right axes and the vertical axis of the camera body 2a. The actuator 12 receives the correction angle data D 'from the gain correction circuit 18 and rotates the correction lens 23 about the left and right axes and the vertical axis of the camera body 2a so as to cancel out the shake. The inclination of the correction lens 23 with respect to the left and right axes and the vertical axis by the actuator 12 is detected by an inclination detection sensor 24 attached to the correction lens 23, and the detection result is converted to A / D converter (not shown) by an A / D converter. D-converted and input to the position detector 13.

  In response to the detection result of the tilt detection sensor 24, the position detector 13 obtains data of the tilt angle of the correction lens 23 with respect to the left and right axes of the camera body 2a and the vertical axis (hereinafter abbreviated as tilt angle data) Dc. This is output to the comparison circuit 19.

  The comparison circuit 19 simultaneously samples the sine wave angle data Db from the integration filter 17 and the inclination angle data Dc from the position detection unit 13 at regular time intervals when the actuator 12 described later is calibrated. As a result, temporal change data of the sine wave angle data Db and the inclination angle data Dc are obtained.

  The comparison circuit 19 uses the obtained sine wave angle data Db and the change data of the tilt angle data Dc with time to use the phase difference ΔTa between the sine wave angle data Db and the tilt angle data Dc and the difference between the maximum amplitudes. ΔAa is obtained and output to the second calibration unit 21.

  The second calibration unit 21 changes the setting of the phase value and the gain value so that the phase difference ΔTa and the maximum amplitude difference ΔAa from the comparison circuit 19 are 0 or less than a specified value. At this time, the second calibration unit 21 stores, for example, a simple data conversion table (previously stored in a memory in the CPU 29 or the like) that represents the relationship between the phase value and the gain value with respect to the phase difference ΔTa and the maximum amplitude difference ΔAa. )) To change the setting. Then, the phase value and gain value when the phase difference ΔTa and the maximum amplitude difference ΔAa are 0 or less than the specified value are rewritten as set values.

  A CCD 25 is arranged behind the lens group. The CCD 25 photoelectrically converts a subject image that has passed through the lens group and formed on the imaging surface, and outputs an imaging signal. The imaging signal output from the CCD 25 is input to the signal processing circuit 26.

  The signal processing circuit 26 performs correlated double sampling, amplification, and A / D conversion on the image signal, and outputs the image signal to the image processing circuit 27 as digital image data. The image processing circuit 27 performs various kinds of image processing such as gradation conversion, γ correction, and white balance correction on the image data. The image data image-processed by the image processing circuit 27 is output as a video to a liquid crystal display 28 (hereinafter abbreviated as LCD; see FIG. 2) provided on the back surface of the camera body 2a, and a memory card (FIG. (Not shown).

  The CPU 29 comprehensively controls the operation of each unit of the digital camera 2. An external input / output terminal 30 is connected to the CPU 29. The external input / output terminal 30 includes a data communication terminal such as a USB connector, for example. The external input / output terminal 30 outputs the correction sensor angle data Da ′ to the comparison circuit 43 (see FIG. 2) and the comparison result (phase difference ΔTb, and Mediates the input of the maximum amplitude difference ΔAb).

  Next, a system for calibrating the angular velocity sensor 10 and the actuator 12 will be described. First, in the inspection process before shipment of the digital camera 2, calibration is performed by the system 40 shown in FIG. 2, which corresponds to the inspection system of the vibration correcting apparatus of the present invention. That is, an excitation table 41 that generates a continuous sine wave vibration having a constant frequency (for example, 10 Hz) that imitates the state of camera shake is prepared, and the digital camera 2 and a calibrated angular velocity sensor (hereinafter referred to as an external sensor) are provided thereon. 42) is attached. Then, the external input / output terminal 30 and the external angular velocity sensor 42 are connected to the comparison circuit 43. As with the angular velocity sensor 10, the external angular velocity sensor 42 is connected to the comparison circuit 43 via a bandpass filter, a DC cut filter, an A / D converter, and an integration filter (all not shown). Yes. Note that the calibrated angular velocity sensor means an angular velocity sensor in which the value of the detected angular velocity signal matches the value of the actually applied vibration.

  The comparison circuit 43 includes a correction sensor angle data Da ′ and an angular velocity signal detected by the external angular velocity sensor 42 from the external input / output terminal 30 and the external angular velocity sensor 42, respectively (hereinafter abbreviated as a calibration angular velocity signal). Data of an angle based on Sc (hereinafter abbreviated as calibration sensor angle data) Dd is input. The comparison circuit 43 simultaneously samples these data at regular time intervals. Thereby, for example, as shown in FIG. 3, data of temporal changes in the correction sensor angle data Da ′ (shown by a solid line) and the calibration sensor angle data Dd (shown by a one-dot chain line) are obtained.

  The comparison circuit 43 uses the obtained correction sensor angle data Da ′ and data of temporal change of the calibration sensor angle data Dd to use the phase difference ΔTb (|) between the correction sensor angle data Da ′ and the calibration sensor angle data Dd. t1-t2 |) and the difference ΔAb (| a1-a2 |) of the maximum amplitude are obtained, and these data are output to the first calibration unit 20 via the external input / output terminal 30 and the CPU 29.

  The first calibration unit 20 changes the setting of the phase value and the gain value so that the phase difference ΔTb and the maximum amplitude difference ΔAb from the comparison circuit 43 are 0 or less than a specified value. At this time, as in the case of the second calibration unit 21, the first calibration unit 20 is based on a simple data conversion table representing the relationship between the phase value ΔTb and the phase value with respect to the maximum amplitude difference ΔAb, and the gain value. Change the settings. Then, the phase value and gain value when the phase difference ΔTb and the maximum amplitude difference ΔAb are 0 or less than the specified value are rewritten as set values.

  Hereinafter, the procedure for calibrating the actuator 12 in the system 40 will be described with reference to the flowchart of FIG. First, with the shaking table 41 stopped, as an initial setting, the phase value of the first calibration unit 20 is reset to 0 °, the gain value is reset to 1, and the changeover switch 14 is set to the terminal b side, that is, a sine wave output. Switch to the unit 15 side.

  After the initial setting, the sine wave output unit 15 is driven to output a sine wave signal Sb, which is converted into a digital signal by the A / D 16. Then, the signal is integrated by the integration filter 17 and sine wave angle data Db is output. While the sine wave angle data Db is output to the comparison circuit 19, the phase and gain are corrected by the gain correction circuit 18 based on the set values of the first and second calibration units 20 and 21, and the corrected sine wave angle is obtained. Data Db ′. The corrected sine wave angle data Db ′ is input to the actuator 12 after D / A conversion.

  When the corrected sine wave angle data Db ′ is input to the actuator 12, the actuator 12 is driven, and the correction lens 23 is moved to the left and right axes of the camera body 2a and up and down so as to cancel the simulated shake due to the sine wave signal Sb. It is driven to rotate around the axis. Accordingly, the inclination detection sensor 24 detects the inclination of the correction lens 23 with respect to the left and right axes and the vertical axis. Then, the detection result is A / D converted and input to the position detection unit 13, and the position detection unit 13 obtains the tilt angle data Dc. The obtained tilt angle data Dc is output to the comparison circuit 19.

  In the comparison circuit 19, the sine wave angle data Db from the integration filter 17 and the tilt angle data Dc from the position detection unit 13 are simultaneously sampled at a constant time interval. Then, using the sine wave angle data Db and the data of temporal change of the tilt angle data Dc obtained by this, the phase difference ΔTa between the sine wave angle data Db and the tilt angle data Dc and the difference ΔAa of the maximum amplitude. Is required. The obtained phase difference ΔTa and maximum amplitude difference ΔAa are output to the second calibration unit 21.

  In the second calibration unit 21, the phase difference ΔTa and the maximum amplitude difference ΔAa from the comparison circuit 19 are 0, or the phase value and gain for the phase difference ΔTa and the maximum amplitude difference ΔAa so as to be equal to or less than a specified value. The setting of the phase value and the gain value is changed based on a simple data conversion table representing the value relationship. Then, the phase value and the gain value when the phase difference ΔTa and the maximum amplitude difference ΔAa are 0 or less than the specified value are rewritten as set values.

  After the set value of the second calibration unit 21 is rewritten, the driving of the sine wave output unit 15 is stopped. Through the above steps, the gain correction setting value is calibrated so that the relationship between the input and output signals of the actuator 12 matches.

  Next, the procedure for calibrating the angular velocity sensor 10 in the system 40 will be described with reference to the flowchart of FIG. First, as an initial setting, the setting value of the second calibration unit 21 at the end of calibration of the actuator 12 is stocked in a memory or the like in the CPU 29, and then the phase value of the second calibration unit 21 is reset to 0 ° and the gain value is reset to 1. Then, the changeover switch 14 is switched to the terminal a side, that is, the angular velocity sensor 10 side.

  After the initial setting, the vibration table 41 is driven to generate sine wave vibration. Due to this vibration, the angular velocity signal Sa and the calibration angular velocity signal Sc are output from the angular velocity sensor 10 and the external angular velocity sensor 42. The angular velocity signal Sa is subjected to the extraction of the frequency component by the band pass filter and the removal of the direct current component by the DC cut filter, then A / D conversion by the A / D 16 and integration by the integration filter 17. Angle data Da is output. The sensor angle data Da is corrected in phase and gain by the gain correction circuit 18 based on the set values of the first and second calibration units 20 and 21, and is set as corrected sensor angle data Da '. The correction sensor angle data Da ′ is output to the comparison circuit 43 via the CPU 29 and the external input / output terminal 30.

  On the other hand, the calibration angular velocity signal Sc is subjected to frequency component extraction, DC component removal, A / D conversion, and integration, as in the case of the angular velocity signal Sa, thereby outputting calibration sensor angle data Dd. The calibration sensor angle data Dd is output to the comparison circuit 43.

  In the comparison circuit 43, the correction sensor angle data Da ′ from the external input / output terminal 30 and the calibration sensor angle data Dd from the external angular velocity sensor 42 are simultaneously sampled at regular time intervals, and the correction sensor angle data obtained thereby is obtained. The phase difference ΔTb and the maximum amplitude difference ΔAb between the correction sensor angle data Da ′ and the calibration sensor angle data Dd are obtained using the data Da ′ and the temporal change data of the calibration sensor angle data Dd. The obtained phase difference ΔTb and maximum amplitude difference ΔAb are output to the first calibration unit 20 via the external input / output terminal 30 and the CPU 29.

  In the first calibration unit 20, the phase difference ΔTb and the phase difference with respect to the maximum amplitude difference ΔAb and the gain so that the phase difference ΔTb from the comparison circuit 43 and the maximum amplitude difference ΔAb are 0 or less than a specified value. The setting of the phase value and the gain value is changed based on a simple data conversion table representing the value relationship. Then, the phase value and gain value when the phase difference ΔTb and the maximum amplitude difference ΔAb are 0 or less than the specified value are rewritten as set values.

  After rewriting the set value of the first calibration unit 20, the set value of the second calibration unit 21 is returned to the value at the end of calibration of the actuator 12, and the drive of the vibration table 41 is stopped. Through the above steps, the gain correction set value is calibrated so that the relationship between the input and output signals of the angular velocity sensor 10 matches. After the calibration of the angular velocity sensor 10, the digital camera 2 is removed from the vibration table 41 and sent to the next other inspection process, and is shipped as a product after completion of all the inspections.

  In the description so far, the method for calibrating the angular velocity sensor 10 and the actuator 12 before the shipment of the digital camera 2 has been described. However, the case where the angular velocity sensor 10 is calibrated after the digital camera 2 is shipped will be described below.

  When the angular velocity sensor 10 is calibrated after the digital camera 2 is shipped, a system 50 shown in FIG. 6 is used. That is, after attaching the external angular velocity sensor 42 to the digital camera 2 and stocking the set value of the second calibration unit 21 at the end of calibration of the actuator 12 in the memory or the like in the CPU 29 as in the case of calibration before shipment, The phase value of the second calibration unit 21 is reset to 0 ° and the gain value is reset to 1. Then, after the changeover switch 14 is switched to the angular velocity sensor 10 side, the digital camera 2 is manually vibrated instead of the vibration table 41.

  In this case, for example, as shown in FIG. 7, the correction sensor angle data Da ′ (obtained by simultaneously sampling the correction sensor angle data Da ′ and the calibration sensor angle data Dd at a constant time interval by the comparison circuit 43, as shown in FIG. Unlike the case where the vibration table 41 of FIG. 3 is used, the temporal change data of the calibration sensor angle data Dd (indicated by the alternate long and short dash line) is an irregular waveform. For this reason, the comparison circuit 43 extracts a waveform whose shape substantially matches from the temporal change data of the correction sensor angle data Da ′ and the calibration sensor angle data Dd, and the phase difference ΔTb, And the difference ΔAb of the maximum amplitude is obtained.

  Further, in this case, until the phase difference ΔTb and the maximum amplitude difference ΔAb are 0 or less than the specified value, manual vibration of the digital camera 2, sampling of the correction sensor angle data Da ′ and the calibration sensor angle data Dd, The calculation of the phase difference ΔTb and the maximum amplitude difference ΔAb and the setting change of the first calibration unit 20 are repeated. Thus, if there is only the external angular velocity sensor 42 and the comparison circuit 43, the angular velocity sensor 10 can be calibrated by simply vibrating the digital camera 2 manually without using a large-scale device such as the vibration table 41. it can.

  In order to make it possible to calibrate the actuator 12 after shipment, for example, as in the digital camera 60 shown in FIG. 8, the time when the actuator 12 was calibrated last time is stored in a memory or the like in the CPU 29. And the current time of the system clock in the CPU 29 are compared by the comparison circuit 61, and the calibration of the actuator 12 may be performed when a predetermined time has elapsed since the last calibration time. Alternatively, a calibration instruction switch 62 for the user to instruct calibration of the actuator 12 may be provided, and the actuator 12 may be calibrated when the calibration instruction switch 62 is operated.

  In this case, as shown in the flowcharts of FIGS. 9 and 10, when a predetermined time has elapsed since the last calibrated time or when the calibration instruction switch 62 is operated, for example, “Recalibration is performed. A message for confirming whether or not recalibration can be performed is displayed on the LCD 28, such as “Yes / No”.

  When recalibration is instructed by the user, the amount of camera shake is detected by the angular velocity sensor 10. If the detected camera shake amount is less than or equal to the pre-specified value, for example, a message that informs the LCD 28 that recalibration will start, such as “Perform recalibration. Do not move the camera.” Display and calibrate the actuator 12 according to the procedure shown in FIG. On the other hand, if the amount of camera shake is equal to or greater than a predetermined value, a message prompting the user to place the camera in a stable location is displayed on the LCD 28, for example, “Please install the camera in a stable location.” To return to the message display for confirming whether or not recalibration can be performed.

  When recalibration of the actuator 12 is performed, after the recalibration, the setting value of the second calibration unit 21 of the previous time and that of the current time is compared by a comparison circuit (not shown) in the CPU 29, and the difference between them is calculated. If the calculated difference is equal to or less than a predetermined value, for example, a message confirming whether the setting of the second calibration unit 21 can be rewritten, such as “Would you like to rewrite the setting? Yes / No”, is displayed on the LCD 28. indicate.

  When rewriting is instructed by the user, the setting of the second calibration unit 21 is rewritten based on the result of the current recalibration. Then, for example, a message reporting that the setting has been rewritten, such as “Setting has been rewritten”, is displayed on the LCD 28, and then the operation mode is shifted to the normal operation mode. When the rewriting is not instructed, for example, a message reporting that the setting has not been rewritten is displayed on the LCD 28, such as “The setting has not been rewritten”, and then the operation mode is shifted to the normal operation mode.

  On the other hand, if the difference between the previous and current settings of the second calibration unit 21 is greater than or equal to the specified value, for example, “Result is abnormal. Do you want to recalibrate again? Yes / No” A message for confirming whether or not to re-do is displayed on the LCD 28.

  When re-calibration is instructed by the user, a counter (not shown) in the CPU 29 that counts the number of re-calibrations is incremented. If the number of executions is less than or equal to a predetermined value, the process returns to the detection of camera shake amount in order to recalibrate. On the other hand, if the number of executions is greater than or equal to the specified value, the actuator 12 itself may be broken, so re-calibration is impossible, for example, “Cannot be re-calibrated. There is a risk of failure.” Is displayed on the LCD 28, and then a message indicating that the setting has not been rewritten is displayed to shift to the normal operation mode.

  As described above, according to the present invention, the angular velocity sensor 10 and the actuator 12 can be calibrated not only before shipment of the digital camera but also after shipment and without using a vibration table that requires installation cost and space. It can be carried out.

  A dedicated operation member may be provided in the digital camera so that the set values of the first and second calibration units 20 and 21 can be manually operated. Further, a program for performing the above series of calibration processing is created and installed in a personal computer, and the functions of the first and second calibration units 20 and 21 and the comparison circuit 43 are realized by the personal computer. May be.

  In the above embodiment, the correction sensor angle data Da ′ that is the detection result of the angular velocity sensor 10 is output to the comparison circuit 43 via the external input / output terminal 30, but the calibration sensor that is the detection result of the external angular velocity sensor 42. The angle data Dd may be input to the digital camera, and the comparison circuit 43 may be mounted on the digital camera side.

  In the above-described embodiment, an example in which a vibration correction device is mounted on a digital camera has been described. However, the present invention can also be applied to other imaging devices such as a mobile phone with a camera and a video camera.

It is a block diagram which shows the outline of the digital camera with a camera-shake correction function of this invention. It is the schematic which shows the system | strain in the case of calibrating before shipment of a digital camera. It is a graph which shows an example of the detection result of the angular velocity sensor and external angular velocity sensor at the time of applying a vibration with a vibration table. It is a flowchart which shows the procedure which calibrates an actuator before shipment of a digital camera. It is a flowchart which shows the procedure which calibrates an angular velocity sensor before shipment of a digital camera. It is the schematic which shows the system | strain in the case of calibrating after shipment of a digital camera. It is a graph which shows an example of the detection result of the angular velocity sensor and external angular velocity sensor at the time of adding a vibration manually. It is a block diagram which shows another embodiment of the digital camera with a camera-shake correction function. It is a flowchart which shows the procedure which calibrates an actuator after shipment with the digital camera shown in FIG. It is a flowchart which shows the procedure which calibrates an actuator after shipment with the digital camera shown in FIG.

Explanation of symbols

2, 60 Digital camera 10 Angular velocity sensor 12 Actuator 15 Sine wave output unit 18 Gain correction circuit 19 Comparison circuit 20, 21 First and second calibration unit 23 Correction lens 29 CPU
30 External input / output terminal 40, 50 System for calibration 41 Excitation table 42 Calibrated angular velocity sensor (external angular velocity sensor)
43 Comparison circuit 61 Comparison circuit 62 Calibration instruction switch

Claims (27)

In a vibration correction apparatus having vibration detection means for detecting vibration and vibration correction means for correcting the vibration so as to cancel out according to the detection result of the vibration detection means,
First calibration means for calibrating the vibration detection means based on a result of comparing the detection result of the vibration detection means and the detection result of a calibrated external vibration detection means prepared separately from the vibration detection means. A vibration correction apparatus comprising:   The first calibration means is obtained from the temporal change waveforms of the detection results of the vibration detection means and the external vibration detection means, and the phase difference and the maximum amplitude difference are 0 or less than a specified value. The vibration correction apparatus according to claim 1, wherein:   The vibration correction apparatus according to claim 1, further comprising an external output unit configured to output a detection result of the vibration detection unit to the outside.   The vibration correction apparatus according to claim 1, further comprising a first storage unit that stores a calibration result of the first calibration unit. The vibration detection means and the external vibration detection means are composed of angular velocity sensors,
5. The detection result of the vibration detection means and the external vibration detection means is angle data obtained by integrating angular velocity signals detected by the angular velocity sensor. The vibration correction apparatus described. Vibration signal generating means for generating a constant continuous vibration signal imitating the state of camera shake;
Comparing means for comparing the vibration signal and the drive output signal of the vibration correcting means when the vibration signal is given;
6. The vibration correction apparatus according to claim 1, further comprising a second calibration unit that calibrates the vibration correction unit based on a comparison result of the comparison unit. The comparison means obtains a phase difference between the vibration signal and a temporal change waveform of the drive output signal, and a difference in maximum amplitude,
The vibration correction apparatus according to claim 6, wherein the second calibration unit is configured such that a difference between the phase difference and the maximum amplitude obtained by the comparison unit is 0 or less than a specified value.   The vibration correction apparatus according to claim 6, further comprising a second storage unit that stores a calibration result of the second calibration unit.   9. The method according to claim 6, further comprising a process transition unit for automatically shifting to a process of calibrating the vibration correction unit when a predetermined time has elapsed from the time of the previous calibration by the second calibration unit. The vibration correcting device according to claim 1.   The vibration correction apparatus according to claim 6, further comprising an operation input unit that shifts the vibration correction unit to a process of calibrating the vibration correction unit. The vibration correcting means comprises an actuator,
The vibration correction apparatus according to claim 6, wherein the drive output signal is data of a displacement amount of a member to be displaced that is displaced by the actuator. The vibration correction device according to any one of claims 1 to 11 is mounted,
The vibration applied to the apparatus main body is detected by the vibration detection means,
An image pickup apparatus, wherein an optical system is mechanically displaced by the vibration correcting means. An inspection method of a vibration correction apparatus for inspecting a vibration correction apparatus having vibration detection means for detecting vibration and vibration correction means for correcting the vibration so as to cancel out vibration according to the detection result of the vibration detection means. And
The vibration detecting means, and an exciting step for applying vibration to the calibrated external vibration detecting means prepared separately from the vibration detecting means,
A first comparison step of comparing the detection results of the vibration detection means and the external vibration detection means;
And a first calibration step of calibrating the vibration detection means based on the comparison result of the first comparison step. In the first comparison step, from the waveform of the temporal change in the detection result of the vibration detection unit and the external vibration detection unit, the phase difference and the maximum amplitude difference are obtained.
14. The vibration correction according to claim 13, wherein, in the first calibration step, the difference between the phase difference and the maximum amplitude obtained in the first comparison step is 0 or less than a specified value. Device inspection method.   15. The inspection method for a vibration correction apparatus according to claim 13, further comprising an external output step of outputting a detection result of the vibration detection means to the outside.   16. The vibration correction apparatus inspection method according to claim 13, further comprising a first storage step of storing a calibration result of the first calibration step. An angular velocity sensor is used for the vibration detection means and the external vibration detection means,
17. The angle data obtained by integrating the angular velocity signal detected by the angular velocity sensor is used as a detection result of the vibration detecting unit and the external vibration detecting unit. The inspection method of the vibration correction apparatus as described.   18. The vibration correcting apparatus inspection method according to claim 13, wherein in the vibration step, a constant continuous vibration is applied to the vibration detection unit and the external vibration detection unit. In the vibration step, irregular vibration is given to the vibration detection means and the external vibration detection means,
In the first comparison step, from the waveform of the temporal change of the detection result of the vibration detection means and the external vibration detection means, a waveform whose shape is substantially the same is extracted,
19. The inspection method for a vibration correcting apparatus according to claim 13, wherein the phase difference and the maximum amplitude difference are obtained for the extracted waveform. A vibration signal input step of giving a constant continuous vibration signal imitating the state of camera shake to the vibration correction means;
A second comparison step of comparing the vibration signal and a drive output signal of the vibration correction means by the vibration signal;
20. The vibration correction apparatus inspection method according to claim 13, further comprising a second calibration step of calibrating the vibration correction unit based on a comparison result of the second comparison step. In the second comparison step, from the waveform of the vibration signal and the temporal change in the drive output signal, the phase difference and the difference in maximum amplitude are obtained,
21. The vibration correction according to claim 20, wherein in the second calibration step, the difference between the phase difference and the maximum amplitude obtained in the second comparison step is 0 or less than a specified value. Device inspection method.   The inspection method for the vibration correcting apparatus according to claim 20, further comprising a second storage step of storing a calibration result of the second calibration step.   23. The vibration correction apparatus according to claim 20, wherein when a predetermined time has elapsed from the time of previous calibration in the second calibration step, the process automatically shifts to a process of calibrating the vibration correction means. Inspection method. An actuator is used for the vibration correction means,
24. The inspection method for a vibration correcting apparatus according to claim 20, wherein data of a displacement amount of a member to be displaced displaced by the actuator is used as the drive output signal. An inspection system for a vibration correction apparatus for inspecting a vibration correction apparatus having vibration detection means for detecting vibration and vibration correction means for correcting the vibration so as to cancel out vibration according to the detection result of the vibration detection means. And
Prepared separately from the vibration detection means, calibrated external vibration detection means,
Comparing means for comparing the detection results of the vibration detection means and the external vibration detection means,
An inspection system for a vibration correcting device, wherein the vibration detecting means is calibrated based on a comparison result of the comparing means. The comparison means obtains the phase difference and the maximum amplitude difference from the temporal change waveform of the detection result of the vibration detection means and the external vibration detection means,
26. The vibration correction apparatus inspection system according to claim 25, wherein the calibration is performed such that a difference between the phase difference and the maximum amplitude obtained by the comparison unit is 0 or less than a specified value.   27. The inspection system for a vibration correction apparatus according to claim 25 or 26, further comprising a vibration means for applying a constant continuous vibration to the vibration detection means and the external vibration detection means.

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