JP2019174697A - Electronic instrument and control method of the same, as well as external device - Google Patents

Abstract

To make a more accurate temperature correction with respect to an output of tremor detection means in an electronic instrument using the tremor detection means.SOLUTION: An electronic instrument comprises: a tremor detection unit 151 that detects a tremor; and a temperature detection unit 152 that detects a temperature around an angular velocity sensor the tremor detection unit 151 has, in which the electronic instrument can be charged with a battery 161 loaded in a main body part 100. When a connection of the main body part 100 to a charger 300 is detected by a loading detection unit 163, a system control unit 120 is configured to: acquire an output of the tremor detection unit 151 in a first temperature before starting the charge; and acquire an output of the tremor detection unit 151 in a second temperature after the charge is stopped. The system control unit 120 is configured to: calculate a temperature correction parameter of the angular velocity sensor from the outputs of the tremor detection unit 151 in the first and second temperatures; and make a temperature drift correction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a temperature correction process for the output of a shake detection element such as an angular velocity sensor.

  The image blur correction function is a function for correcting image blur due to camera shake or the like in an electronic apparatus having an imaging function. Optical or electronic image blur correction is performed based on shake information detected using a shake detection sensor such as an angular velocity sensor.

  Since the offset component included in the output of the angular velocity sensor has individual differences and changes with time, it is necessary to execute calibration to remove the offset component. At that time, since the offset component and the motion detection component cannot be distinguished from each other in the output of the angular velocity sensor, in order to remove only the offset component, it is necessary to execute calibration in a stationary state cut off from external vibration and noise. is there. Japanese Patent Application Laid-Open No. 2004-151561 discloses a technique for executing calibration of a camera shake detection element when a charging state detection unit detects the start of charging, and ending calibration when detecting charging stop.

  On the other hand, the angular velocity sensor has a characteristic that a temperature drift exists and an offset component changes depending on the temperature. In order to perform accurate shake detection, it is necessary to remove the offset change due to temperature. Patent Document 2 discloses a technique for performing temperature correction from a sensor output at a reference first temperature and a sensor output at a second temperature acquired in a stationary state.

JP 2009-77021 A JP 2015-200807 A

However, in the prior art disclosed in Patent Document 1, since calibration is performed during charging, offset removal with high accuracy cannot be performed when affected by vibration due to the transformer operation of the charging circuit. Moreover, in the prior art disclosed in Patent Document 2, the timing for acquiring the second temperature for calculating the temperature correction is when the stationary state is determined by tripod detection. Since there is not always a difference between the second temperature at the time of tripod detection and the first temperature, the temperature correction cannot be calculated when the temperature difference is small.
An object of the present invention is to perform more accurate temperature correction for the output of the shake detection means in an electronic device using the shake detection means.

  An electronic device according to an embodiment of the present invention includes a first detection unit that detects a temperature of the electronic device, a second detection unit that detects a shake of the electronic device, and a charging unit connected to the electronic device. Third detecting means for detecting this, control means for controlling charging of the battery by the charging means, and correcting means for performing temperature correction on the output of the second detecting means. When it is detected by the third detection means that the charging means is connected to the electronic device, the correction means is detected by the first detection means before the charging means starts charging the battery. The output of the second detection means at the first temperature measured and the output of the second detection means at the second temperature detected by the first detection means after the charging means starts charging the battery. The temperature correction parameter is calculated from the above, and the temperature correction is performed.

  ADVANTAGE OF THE INVENTION According to this invention, the more accurate temperature correction can be performed with respect to the output of a shake detection means in the electronic device using a shake detection means.

It is a block diagram which shows the structure of the electronic device which concerns on 1st Embodiment. It is a flowchart which shows the temperature correction process of the angular velocity sensor in 1st Example. It is a flowchart which shows the temperature correction process of the angular velocity sensor in 2nd Example. It is a flowchart which shows the temperature correction process of the angular velocity sensor in 3rd Example. It is a flowchart which shows the temperature correction process of the angular velocity sensor in 4th Example. It is a block diagram which shows the structure of the electronic device which concerns on 2nd Embodiment. It is a flowchart which shows the process of 2nd Embodiment. FIG. 4 is a relationship diagram between an imaging device axis and an accessory axis. It is a figure showing the axis | shaft corresponding to the shake detection sensor arrangement | positioning inside the accessory of the modification 1. FIG. It is a figure showing the relationship between the imaging device of the modification 1, each axis | shaft of an accessory, and shake detection output. It is a figure showing the relationship between the imaging device of a modification 2, an accessory, and a battery grip. It is explanatory drawing of the connection determination of the imaging device of a modification 2, an accessory, and a battery grip.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Each embodiment shows an application example to a digital camera as an electronic device.

[First Embodiment]
FIG. 1 is a block diagram illustrating a configuration example of an imaging apparatus according to the present embodiment. An apparatus main body (hereinafter simply referred to as a main body) 100 of the imaging apparatus can be mounted with an interchangeable lens unit (hereinafter referred to as a lens section) 200. The main body unit 100 includes a connection terminal unit 101, and the lens unit 200 includes a connection terminal unit 201. The connection terminal portions 101 and 201 electrically connect the main body portion 100 and the lens portion 200. The system control unit 120 in the main body unit 100 can communicate with the lens control unit 203 in the lens unit 200 via the connection terminal units 101 and 201. The lens mounts 102 and 202 are mechanical holding mechanism units for connecting the main body unit 100 and the lens unit 200. The lens mount 102 is provided in the main body unit 100, and the lens mount 202 is provided in the lens unit 200.

  The charger 300 charges the battery in the imaging device via the connection interface units 103 and 303. The connection interface unit 103 is provided in the main body unit 100, the connection interface unit 303 is provided in the charger 300, and each unit includes an electrical connection terminal.

  First, the configuration of the main body 100 will be described. The system control unit 120 includes a CPU (Central Processing Unit) and controls the entire imaging system. The system control unit 120 can communicate with the lens control unit 203 via the connection terminal units 101 and 201 to control the lens unit 200. The imaging element 121 performs photoelectric conversion on an optical image of a subject formed through the imaging optical system in the lens unit 200 and the shutter 144 in the main body unit 100 and outputs an electrical signal.

  An A / D (analog / digital) converter 122 acquires an analog signal output from the image sensor 121 and converts it into a digital signal. The digital signal after A / D conversion is controlled by the memory control unit 124 and the system control unit 120 and stored in the memory 127.

  The image processing unit 123 performs image processing such as pixel interpolation processing and color conversion processing on the digital signal converted by the A / D conversion unit 122. The image processing unit 123 includes a compression / decompression circuit that compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like. The image processing unit 123 can read the image data stored in the memory 127, perform compression processing or decompression processing, and write the processed data to the memory 127. The image processing unit 123 calculates a correlation value between past image data stored in the memory 127 and data of the current captured image, and searches for an image region having the highest correlation. The image processing unit 123 can calculate the contrast value of the captured image and measure the in-focus state related to the captured image from the contrast value.

  The memory control unit 124 controls data transmission / reception among the A / D conversion unit 122, the image processing unit 123, the display device 125, the memory 127, and the external removable memory unit 128. The display device 125 includes, for example, a liquid crystal panel and a backlight illumination unit. By sequentially displaying the imaging data acquired by the imaging element 121 as a through image on the display device 125, so-called live view imaging can be performed. During live view shooting, the display device 125 displays a focus state detection frame indicating an AF area on the screen so that the user can recognize an AF (automatic focus adjustment) subject. In the case where the screen unit of the display device 125 has a touch panel, it is possible to realize touch AF in which the user specifies the position of a desired subject on the screen.

  The memory 127 stores captured still images and moving images, and image data for playback display. The memory 127 has a storage capacity sufficient for storing a predetermined number of still images and moving images. In the memory 127, a program stack area, a status storage area, a calculation area, a work area, and an image display data area of the system control unit 120 are secured. Various calculations are executed by the system control unit 120 using the calculation area of the memory 127.

  The external removable memory unit 128 records or reads an image file on a recording medium such as a compact flash (registered trademark) or an SD card. The nonvolatile memory 130 is an electrically erasable and recordable storage device such as a flash memory or an EEPROM (Electrically Erasable Programmable Read-Only Memory). The nonvolatile memory 130 stores data indicating the shooting state, various adjustment values, and the like. The offset correction value and temperature correction value data of an angular velocity sensor, which will be described later, are stored in the nonvolatile memory 130.

  The shutter control unit 141 operates the shutter 144 in accordance with a control command from the system control unit 120 based on the photometric information by the photometric unit 142 in cooperation with a lens control unit 203 that controls the driving of a diaphragm 211, which will be described later. To control. The shutter 144 shields the image sensor 121 during non-shooting and opens during shooting to guide light to the image sensor 121.

  The photometric unit 142 includes a photometric sensor for performing AE (automatic exposure) control. Light enters the photometric unit 142 through the imaging optical system in the lens unit 200, the lens mounts 202 and 102, and a photometric lens (not shown), and the exposure state of the captured image is measured by the photometric sensor. Photometric information from the photometric unit 142 is output to the system control unit 120.

  The distance measuring unit 143 performs AF processing and outputs a detection signal of the focus state of the imaging optical system to the system control unit 120. Light enters the distance measuring unit 143 via the imaging optical system in the lens unit 200, the lens mounts 202 and 102, and a distance measuring mirror (not shown), and the distance measuring unit 143 relates to the formed optical image. Measure the in-focus state. During live view shooting, it is also possible to measure the in-focus state according to the contrast value calculated from the image data output from the image processing unit 123.

  The shake detection unit 151 detects a shake amount of the main body 100 due to hand shake or external vibration. For example, an angular velocity sensor is used, and the shake detection unit 151 detects a vibration amount and a vibration direction in the pitch direction and the yaw direction, and outputs a shake detection signal to the system control unit 120. The system control unit 120 controls image blur correction based on the shake detection signal. For example, the imaging optical system in the lens unit 200 includes a shift lens that can optically move the angle of view, and an image shake correction function is realized by moving the shift lens in a direction in which the shake amount is canceled. . Alternatively, image blur correction for moving the image sensor 121 on a plane orthogonal to the optical axis of the imaging optical system, or electronic image blur correction for performing image processing on an image acquired by the image sensor 121 is performed. The output signal of the shake detection unit 151 is used for image shake correction of the background image and the main subject image in the panorama shooting function and the panning assist function that supports the user's panning.

  An offset component exists in the output of the angular velocity sensor provided in the shake detection unit 151, and the offset amount changes due to individual differences and changes over time. Further, the angular velocity sensor has a characteristic that a temperature drift exists and an offset amount changes depending on the temperature. In the present embodiment, a configuration in which the shake detection unit 151 is mounted on the main body 100 will be described. However, a configuration in which the shake detection unit is mounted on the battery 161 or the lens unit 200 may be used.

  The temperature detection unit 152 detects the temperature in the main body 100 and outputs a temperature detection signal to the system control unit 120. The temperature detector 152 is used for the purpose of detecting the ambient temperature of the angular velocity sensor. The time measuring unit 153 includes a timer for measuring time, and is used for the purpose of measuring the elapsed time from the start of charging. The system control unit 120 acquires time information of the time measurement unit 153.

  The battery 161 is a rechargeable secondary battery that supplies power for operating the imaging apparatus and can be repeatedly charged and discharged. The battery 161 is housed in a battery pack and used in a state where it is mounted on the main body 100. The battery 161 can be charged in a state where the battery pack is mounted on the main body 100. The power supply control unit 162 performs control for converting the voltage of the battery 161 into a voltage necessary for each circuit block and supplying the voltage according to the control command of the system control unit 120. The power controller 162 includes a DC-DC converter and the like.

  The attachment detection unit 163 detects that the charger 300 is attached to the main body unit 100. The charging control unit 164 performs charging control of the battery 161. When the attachment detection unit 163 detects that the charger 300 is attached to the main body unit 100, the charging control unit 164 charges the battery 161 with a necessary charging current. The charging control unit 164 monitors the cell voltage of the battery 161 during the charging operation, determines that charging is complete when the cell voltage reaches a predetermined voltage, and stops charging the battery 161.

  Next, the configuration of the lens unit 200 will be described. The lens unit 200 is an interchangeable lens type lens unit, and includes a lens 210 and a diaphragm 211. The lens 210 includes a zoom lens and a focus lens, but is shown as a single lens for simplicity of illustration. Light from the subject forms an image on the image sensor 121 via the lens 210, the diaphragm 211, the lens mounts 202 and 102, and the shutter 144. The movable lens included in the lens 210 moves according to the output of the lens driving unit 204. Further, the lens driving unit 204 adjusts the amount of light passing through the diaphragm 211 by controlling the opening amount of the diaphragm 211 during photographing.

  The lens control unit 203 includes a CPU and controls the lens unit 200. The lens control unit 203 has a memory for storing operation constants, variables, programs, and the like. The lens control unit 203 also includes identification information such as a number unique to the lens unit 200, management information, function information such as an open aperture value, a minimum aperture value, and a focal length, current and past set values, and lens drive unit 204 settings. A non-volatile memory that holds drive frequency information and the like is included. The lens control unit 203 performs focus adjustment control according to in-focus state detection information (focus detection information) measured by the distance measurement unit 143 or the image processing unit 123. The AF operation is performed by changing the imaging position of the subject image incident on the image sensor 121 by driving the focus lens. The lens control unit 203 controls the diaphragm 211, zooming control, and image blur correction.

  The lens driving unit 204 drives the lens 210 and the aperture 211 in accordance with a control command from the lens control unit 203. The lens driving unit 204 drives the focus lens and the zoom lens by the focus control signal and the zooming control signal from the lens control unit 203. Further, the lens driving unit 204 drives the diaphragm 211 based on the diaphragm control signal from the lens control unit 203. The lens driving unit 204 is a correction lens for correcting image blur according to control commands of the system control unit 120 and the lens control unit 203 based on the information on the pitch direction, yaw direction vibration amount and vibration direction detected by the shake detection unit 151. Drive. The correction lens is, for example, a shift lens or a tilt lens, and realizes a camera shake correction function by moving in a direction to cancel the shake amount of the imaging apparatus.

  Next, the configuration of the charger 300 will be described. The charger 300 supplies power for charging the battery 161 attached to the main body 100. The charger 300 and the main unit 100 are connected via connection interface units 103 and 303. For example, there are a method of supplying electric power from an external device such as a personal computer by a wired connection by USB (Universal Serial Bus), a method of charging by a contactless connection using an electromagnetic induction action, and the like. The control unit 301 controls the operation of the charger 300. The configuration and connection method of the charger 300 are various and can be arbitrarily selected in design. Note that illustration and description of an operation unit, an interface unit, and the like that are normally provided in the imaging apparatus are omitted.

[First embodiment]
The offset correction and temperature drift correction of the angular velocity sensor of this embodiment will be described with reference to the flowchart of FIG. The following processing is realized by the CPU of the system control unit 120 executing a control program.

  First, the mounting detection unit 163 determines whether the charger 300 is mounted and connected to the main body unit 100 (S101). When the attachment and connection of the charger 300 are detected, the process proceeds to S102. When the attachment of the charger 300 is not detected, the determination process of S101 is repeatedly executed. In step S <b> 102, the system control unit 120 acquires the output before correction of the angular velocity sensor from the shake detection unit 151. At this time, the system control unit 120 acquires the first temperature (denoted as T1) from the temperature detection unit 152, and stores the T1 data in the nonvolatile memory 130 in association with the output before correction of the angular velocity sensor.

In S103, the system control unit 120 stores the output of the angular velocity sensor at the temperature T1 acquired in S102 in the nonvolatile memory 130 as an offset correction value. The output before correction of the angular velocity sensor at the temperature T is expressed as G (T), and the offset correction value is expressed as O. The offset correction value O is expressed by equation (1).
O = G (T1) (1)

  After the system control unit 120 calculates the offset correction value O in S103, the system control unit 120 controls the charging control unit 164 to start charging the battery 161 (S104). The charging control unit 164 monitors the cell voltage of the battery 161 during the charging operation. In S105, a determination process is performed as to whether or not charging is completed. If it is determined that the cell voltage reaches a certain voltage and charging is completed, the charging operation is stopped, and the process proceeds to S106. While the charging is not completed, the determination process of S105 is repeatedly executed.

  In step S <b> 106, the system control unit 120 acquires the output before correction of the angular velocity sensor from the shake detection unit 151. At this time, the system control unit 120 acquires the second temperature (denoted as T2) from the temperature detection unit 152 and stores the T2 data in the nonvolatile memory 130 in association with the output before correction of the angular velocity sensor.

In S107, the system control unit 120 calculates a temperature correction parameter. The output before correction of the angular velocity sensor at the temperature T1 acquired in S102 is G (T1), and the output before correction of the angular velocity sensor at the temperature T2 acquired in S106 is G (T2). When the temperature correction coefficient of the angular velocity sensor is expressed as K, the temperature correction coefficient K is expressed by Expression (2).
K = {G (T2) -G (T1)} / (T2-T1) (2)

In S108, the system control unit 120 performs offset correction and temperature drift correction of the angular velocity sensor using the offset correction value O calculated in S103 and the temperature correction coefficient K calculated in S107. The angular velocity sensor output after offset correction and temperature drift correction at an arbitrary temperature T is expressed as Ga (T). Ga (T) is represented by Formula (3).
Ga (T) = G (T) −O−K × (T−T1) (3)

  In this embodiment, by calculating an offset correction value from the output of the angular velocity sensor acquired before the start of charging and executing calibration, high accuracy is obtained without being affected by vibration caused by the transformer operation of the charging circuit during charging. Offset correction is possible. Further, for calculating the temperature correction coefficient, it is necessary to acquire angular velocity sensor outputs at a plurality of temperatures having a certain large temperature difference. However, the angular velocity sensor output is acquired before and after charging. That is, since the angular velocity sensor output at a plurality of temperatures having a large temperature difference can be reliably obtained by using the temperature change due to the charging operation, temperature correction with higher accuracy can be performed.

[Second Embodiment]
The offset correction and temperature drift correction of the angular velocity sensor of this embodiment will be described with reference to the flowchart of FIG. Hereinafter, differences from FIG. 2 will be mainly described. The way of omitting such description is the same in the embodiments described later.

  The processes in S201, S203 to S205 in FIG. 3 are the same as the processes in S101 to S104 in FIG. When the attachment detection unit 163 detects that the charger 300 is attached to the main body unit 100 in S201, the value of the count variable n is set to 1 in S202. The count variable n represents how many times the angular velocity sensor output at a plurality of temperatures for calculating the temperature correction coefficient is acquired. In S202, after the initial value 1 is set to n, the processing from S203 to S205 is executed.

  In step S <b> 206, the system control unit 120 acquires temperature data from the temperature detection unit 152 at a constant cycle, and monitors a temperature change amount (denoted as ΔT) from the first temperature T <b> 1 before the start of charging. The temperature change amount ΔT is compared with V × n, which is a value obtained by multiplying the predetermined value V by the value of the count variable n. When the temperature change amount ΔT is equal to or greater than V × n, the process proceeds to S207. When the temperature change amount ΔT is less than V × n, the process proceeds to S211.

  In S207, the system control unit 120 increments the count variable n. After 1 is added to the n value, the system control unit 120 controls the charging control unit 164 to temporarily stop the charging of the battery 161 (S208). Next, the system control unit 120 acquires the output before correction of the angular velocity sensor. At this time, the system control unit 120 obtains the nth temperature Tn from the temperature detection unit 152 and stores the Tn data in the nonvolatile memory 130 in association with the output before correction of the angular velocity sensor (S209). Then, the system control unit 120 controls the charging control unit 164 to resume charging of the battery 161 (S210). The processing is returned to S206 and monitoring of the temperature change amount ΔT is continued.

  In step S <b> 211, the system control unit 120 determines whether the charger 300 has been removed from the main body unit 100 based on a detection signal from the attachment detection unit 163. When it is determined that the charger 300 has been removed from the main body 100, the process proceeds to S212, and when it is determined that the charger 300 has not been removed from the main body 100, the process returns to S206.

  In S212, the system control unit 120 determines whether the value of the count variable n is 1. When the n value is 1, the process proceeds to S215 without calculating the temperature correction coefficient. If the value of the count variable n is 2 or more, the process proceeds to S213.

In S213, the system control unit 120 calculates the angular velocity sensor from the output G (T1) before correction of the angular velocity sensor at the temperature T1 acquired in S203 and the output G (Tn) before correction of the angular velocity sensor at the temperature Tn acquired in S209. The temperature correction coefficient K is calculated.
K = {G (Tn) -G (T1)} / (Tn-T1) (2n)
For example, when n = 2, the temperature correction coefficient K is expressed by the above equation (2).

In S214, the system control unit 120 performs offset correction and temperature drift correction of the angular velocity sensor using the offset correction value O calculated in S204 and the temperature correction coefficient K calculated in S213. The angular velocity sensor output Ga (T) after offset correction and temperature drift correction at an arbitrary temperature T is expressed by the following equation (3).
Ga (T) = G (T) −O−K × (T−T1) (3)
When the n value is 3 or more, the angular velocity sensor output after correction is obtained by a high-order correction equation using n temperatures T1 to Tn and n angular velocity sensor outputs G (T1) to G (Tn). Can be calculated with higher accuracy.
In step S215, the system control unit 120 executes offset correction of the angular velocity sensor using the offset correction value O calculated in step S204. A series of processing ends after execution of the processing of S214 or S215.

  In the present embodiment, the angular velocity sensor output at more temperatures is acquired when there is a temperature change equal to or greater than the threshold value before and after the start of charging. Thereby, the angular velocity sensor output at a plurality of temperatures having a large temperature difference can be reliably acquired, and more accurate temperature correction can be performed.

[Third embodiment]
The offset correction and temperature drift correction operations of the angular velocity sensor of this embodiment will be described with reference to the flowchart of FIG. The processing from S301 to S305 in FIG. 4 is the same as the processing from S201 to S205 in FIG.

  In step S306 following step S305, the system control unit 120 controls the time measurement unit 153 to start measuring the elapsed time (denoted by t) from the charging start point. In step S307, the system control unit 120 determines whether the elapsed time t has exceeded a predetermined threshold time. When it is determined that the elapsed time t from the charging start time exceeds the threshold time, the process proceeds to S308. When it is determined that the elapsed time t from the charging start time does not exceed the threshold time, the process proceeds to S312.

  In step S308, the system control unit 120 increments the count variable n, and the process proceeds to step S309. The processes of S309 and S310 are the same as the processes of S208 and S209 of FIG. After the charging is stopped in S309, the angular velocity sensor output data at the temperature Tn is stored in the nonvolatile memory 130 in S310.

  In S <b> 311, the system control unit 120 controls the time measurement unit 153 to reset the value of the elapsed time t, controls the charge control unit 164, and resumes charging of the battery 161. Thereafter, the process returns to S307 to continue the processing. Since the processes from S312 to S316 are the same as the processes from S211 to S215 in FIG. 3, their descriptions are omitted.

  In this embodiment, by acquiring the angular velocity sensor output when a predetermined time has elapsed after the start of battery charging, the angular velocity sensor output at a plurality of temperatures having a large temperature difference can be reliably obtained, and more accurate temperature correction is performed. Is possible.

[Fourth embodiment]
In the flowchart of FIG. 5, the processes from S401 to S405 and S407 to S415 are the same as the processes from S301 to S305 and S308 to S316 in FIG. Therefore, those descriptions are omitted, and the processes of S406 and S410 which are different points will be described.

  In the present embodiment, since there is no processing corresponding to S306 in FIG. 4, the processing proceeds to S406 after the start of charging shown in S405. In step S <b> 406, the system control unit 120 monitors the cell voltage of the battery 161 using the charge control unit 164, and determines whether there is a change in the battery capacity of the battery 161. The monitoring method related to the amount of change in battery capacity (referred to as ΔC) of the battery 161 is not limited to the method based on cell voltage monitoring. For example, when the battery 161 is a battery equipped with an FG (Fuel Gauge) mechanism, the battery capacity can be measured by the FG mechanism. Therefore, the system controller 120 can monitor the battery capacity by communicating with the battery 161. is there.

  In S406, the battery capacity change amount ΔC is compared with a threshold value. This threshold value is a value obtained by multiplying the predetermined value W by the value of the count variable n, that is, W × n. When it is determined that the change amount ΔC of the battery capacity is equal to or greater than the threshold value, the processing from S407 to S409 is executed. In step S410, the system control unit 120 resumes charging, and then returns to the processing in step S406. When it is determined that the battery capacity change amount ΔC is less than the threshold value, the process proceeds to S411.

  In this embodiment, the angular velocity sensor output at a plurality of temperatures having a large temperature difference can be reliably obtained by obtaining the angular velocity sensor output when the amount of change in the battery capacity exceeds a predetermined amount after the start of battery charging. Therefore, temperature correction with higher accuracy becomes possible.

  According to the above embodiment, calibration with higher accuracy can be executed in a state where it is difficult to be affected by external vibration. By reliably acquiring the output of the angular velocity sensor under a plurality of temperature conditions with temperature differences, it is possible to correct the temperature drift with respect to the output of the angular velocity sensor.

[Second Embodiment]
Next, as a second embodiment of the present invention, an example in which an external device that can be connected to the main body of the imaging apparatus includes a shake detection unit will be described. The external device is a camera accessory such as a battery grip or a cradle. When the connection position between the main body of the imaging apparatus and the accessory is variable, the correspondence between the axis of the imaging apparatus and the axis of the shake detection sensor changes depending on the attachment position of the accessory. Therefore, for example, when the main body of the imaging device to which the accessory is connected is moved in the yaw direction, there is a possibility that the imaging device erroneously determines that it has moved in the pitch direction and performs control. In the present embodiment, an example of an imaging system capable of acquiring correct shake detection information even when an accessory having a shake detection unit that can be connected to the main body of the imaging apparatus is connected to an arbitrary position will be described.

  FIG. 6 is a block diagram illustrating a configuration example of a lens unit exchangeable imaging apparatus as an example of the imaging system according to the present embodiment. Hereinafter, differences from the configuration shown in FIG. 1 will be described.

  First, the configuration of the accessory 1300 will be described. Connection terminal portions 1103 and 1301 electrically connect the main body portion 100 and the accessory 1300. The main body portion 100 includes a connection terminal portion 1103, and the accessory 1300 includes a connection terminal portion 1301.

  The accessory control unit 1310 controls the accessory 1300 as a whole. The accessory control unit 1310 transmits a detection signal related to accessory connection to the system control unit 120. The system control unit 120 determines whether the accessory 1300 is directly connected to the main body unit 100 according to the output level of the detection signal.

  The shake detection unit 1311 includes, for example, an angular velocity sensor, detects the vibration amount and vibration direction of the accessory 1300, and outputs a detection signal to the accessory control unit 1310. The accessory control unit 1310 transmits the information on the pitch direction, yaw direction vibration amount, and vibration direction detected by the shake detection unit 1311 to the system control unit 120 via the connection terminal unit 1301.

  The nonvolatile memory 1312 can be electrically erased and recorded, and flash memory, EEPROM, or the like is used. The non-volatile memory 1312 stores reference axis information according to the sensor arrangement of the shake detection unit 1311.

  Next, the configuration within the main body 100 will be described. The image calculation unit 129 calculates the contrast value of the captured image acquired by the image sensor 121 and measures the in-focus state related to the captured image from the contrast value. The image calculation unit 129 calculates a correlation value between the image data stored in the memory 127 and the data of the current captured image, and searches for an image region having the highest correlation. The calculation result of the image calculation unit 129 is output to the system control unit 120 via the bus.

  The system control unit 120 can communicate with the lens unit 200 and the accessory 1300. The system control unit 120 can communicate with the accessory control unit 1310 via the connection terminal units 1103 and 1301 and acquire accessory information. Further, the system control unit 120 controls image blur correction based on the detection information of the shake detection unit 1311 received from the accessory 1300.

  The power supply unit 131 includes a battery, a battery detection circuit, a DC-DC converter, a switch circuit that switches a block to be energized, and the like, and detects whether or not the battery is installed, the type of battery, and the remaining battery level. The power supply unit 131 controls the DC-DC converter based on the detection result and the control command from the system control unit 120 to supply the power supply voltage to each circuit unit.

  The operation unit 132 performs a process of accepting a user operation instruction and inputting various operation instructions to the system control unit 120. The operation unit 132 includes a switch, a dial, a pointing device based on line-of-sight detection, a voice recognition device, and the like.

  The shake control unit 133 implements a camera shake correction function based on the information on the pitch direction, the vibration amount in the yaw direction, and the vibration direction detected by the shake detection unit 1311 included in the accessory 1300. For example, the system control unit 120 controls the image blur correction by moving the shift lens in the lens unit 200 in the direction to cancel out the shake amount by the shake control unit 133 and the lens control unit 203. Alternatively, in a configuration including a drive mechanism unit that moves the image sensor 121, the system control unit 120 controls the image blur correction by moving the image sensor 121 in a direction that cancels out the shake amount. In addition, the system control unit 120 uses the detection signal of the shake detection unit 1311 to realize an electronic image shake correction function that extracts a part of an image during moving image shooting, a panorama shooting function, a panning assist function, and the like.

  The distance measurement unit 143 detects the focus state of the imaging optical system according to the contrast value calculated from the image data output from the image calculation unit 129 during live view shooting. The accessory connection position determination unit 145 determines which position the accessory 1300 is connected to the main body unit 100 of the imaging apparatus, and outputs a determination signal to the system control unit 120. The system control unit 120 performs control to match the reference axis of the main body unit 100 with the reference axis of the accessory 1300 according to the position of the accessory 1300 determined by the connection position determination unit 145.

  A lens control unit 203 in the lens unit 200 communicates with the system control unit 120 and controls the lens driving unit 204 based on a control command from the shake control unit 133. The lens driving unit 204 moves the shift lens constituting the imaging optical system in accordance with a control signal corresponding to the information on the pitch direction, yaw direction vibration amount, and vibration direction detected by the shake detection unit 1311 to correct image blur. Do.

  With reference to FIG. 7 and FIG. 8, the setting of the axis | shaft according to the position of the accessory 1300 connected to the main-body part 100 is demonstrated. FIG. 7 is a flowchart showing an example of processing, and each processing is realized by the system control unit 120 expanding and executing a program in the nonvolatile memory 128 in the memory 127. FIG. 8 is a diagram illustrating the relationship between the axis of the imaging device and the axis of the accessory when the accessory is connected to a different position of the main body.

  In S701 of FIG. 7, the system control unit 120 and the accessory control unit 1310 perform communication. In step S <b> 702, the system control unit 120 determines whether the accessory 1300 attached to the main body unit 100 has a shake detection sensor. If the accessory 1300 has a shake detection sensor, the process proceeds to S703. If the accessory 1300 does not have a shake detection sensor, the process proceeds to S706.

  In step S <b> 703, the system control unit 120 determines whether the accessory 1300 is attached to the first position in the main body unit 100. In the first position, for example, it is assumed that the accessory 1300 is attached to the main body 100 in the direction shown in FIG. An axis in a direction parallel to the optical axis of the imaging optical system of the imaging apparatus is defined as an X axis, and two axes orthogonal to the X axis are defined as a Y axis and a Z axis. The Y-axis direction is a direction parallel to the long side direction of the screen of the display unit provided on the back surface of the main body unit 100. The accessory 1300 in FIG. 8A is attached to the main body 100 in a direction parallel to the Z axis.

  The accessory control unit 1310 transmits a signal corresponding to the posture to the system control unit 120. For example, when the level of the signal received from the accessory control unit 1310 is the Hi level, the system control unit 120 determines the position of the accessory 1300 as the first position. In addition, when the level of the signal received from the accessory control unit 1310 is the Low level, the system control unit 120 determines that the position of the accessory 1300 is not the first position. If it is determined in S703 that the position of the accessory 1300 is the first position, the process proceeds to S704. If it is determined that the accessory 1300 is not the first position, the process proceeds to S705.

  In step S <b> 704, the system control unit 120 sets the axis assignment setting of the shake detection sensor included in the accessory 1300 to the first setting. As shown in FIG. 8A, the first setting is that the accessory 1300 corresponding to the X axis, the Y axis, and the Z axis set in the main body 100 is set to the posture of the accessory 1300 with respect to the main body 100, respectively. The setting is the Xb axis, Yb axis, and Zb axis. That is, the Xb axis, the Yb axis, and the Zb axis are parallel to the X axis, the Y axis, and the Z axis, respectively.

  In step S <b> 705, the system control unit 120 sets the axis assignment setting of the shake detection sensor included in the accessory 1300 to the second setting. As shown in FIG. 8 (B), the second setting is that the accessory 1300 is oriented with respect to the main body 100 with respect to the X axis, the Y axis, and the Z axis of the accessory 1300, The Zb axis and the Xb axis are settings corresponding to each other. In this case, the accessory 1300 is mounted on the main body 100 together with the component in a state where the accessory 1300 is attached to the battery grip 1400 as an external device in the direction indicated by the dotted arrow. The directions of the Zb axis and Xb axis of the accessory 1300 are opposite to the Y axis and Z axis of the main body 100, respectively. Therefore, when the sign of the output signal of the shake detection sensor is defined that the direction of the Y-axis and Z-axis of the main body 100 is a positive output, the output on the Zb-axis and the Xb-axis is negative. The system control unit 120 correctly sets the relationship between the three axes of the main body 100 and the three axes of the accessory 1300 according to the position of the accessory 1300. In step S <b> 706, the system control unit 120 restricts functions related to image blur correction because the accessory 1300 does not include a shake detection sensor.

  In the present embodiment, when an accessory 1300 having a shake detection sensor is connected to the main body 100 at the first or second position, correct shake detection is achieved by matching the axis of the main body 100 with the axis of the accessory. The output value of the sensor can be acquired.

[Modification 1 of the second embodiment]
With reference to FIG. 9 and FIG. 10, the setting of the axis of the accessory according to the arrangement of the shake detection sensor inside the accessory in this modification will be described. FIG. 9 shows an axis corresponding to the arrangement of the shake detection sensor inside the accessory 1300. FIG. 9A shows the X axis, the Y axis, and the Z axis set in the main body 100 of the imaging apparatus. FIG. 10 shows a list of output values of the axis of the accessory 1300 corresponding to the axis of the main body 100 and the corresponding shake detection sensor.

  FIG. 9B shows the position and orientation of the shake detection sensor arranged inside the accessory 1300. In this case, the axes of the accessory 1300 corresponding to the X axis, the Y axis, and the Z axis of the main body 100 are the Xb axis, the Yb axis, and the Zb axis, respectively. The axes of the shake detection sensors corresponding to the X axis, Y axis, and Z axis of the main body 100 are the Xc axis, Yc axis, and Zc axis, respectively. As shown in FIG. 10, since the direction vector representing the axis of the shake detection sensor has the same direction as the direction vector representing the axis of the main body 100, the signs of the output signals of the shake detection unit 1311 corresponding to each axis are all positive. Become.

  FIG. 9C shows another example of the position and orientation of the shake detection sensor arranged inside the accessory 1300. In this case, the axes of the accessory 1300 corresponding to the X-axis, Y-axis, and Z-axis of the main body 100 are the Xb-axis, Yb-axis, and Zb-axis, respectively, but the corresponding shake detection sensor axes are the Yc-axis, Zc-axis, Xc axis. That is, the Yc axis is parallel to the X axis, the Zc axis is parallel to the Y axis, and the Xc axis is parallel to the Z axis. Since the direction vectors representing the Zc axis and Xc axis of the shake detection sensor are opposite to the direction vectors representing the Y axis and Z axis of the main body 100, respectively, the sign of the output value of the shake detection unit 1311 corresponding to each axis Becomes negative (FIG. 10). Since the direction vector representing the Yc axis of the shake detection sensor is in the same direction as the direction vector representing the X axis of the main body 100, the sign of the output signal of the shake detection unit 1311 corresponding to the axis is positive.

  In the present modification, in the imaging apparatus to which the accessory 1300 having the shake detection unit 1311 can be connected, the position and orientation of the shake detection sensor inside the accessory exist in a plurality of forms. The system control unit 120 acquires the correct output value of the shake detection unit 1311 by changing the sign of the output value of the shake detection sensor so that the axis of the main body unit 100 of the imaging apparatus matches the axis of the shake detection sensor. Can do.

[Modification 2 of the second embodiment]
With reference to FIG. 11 and FIG. 12, an imaging device capable of connecting accessories to different positions in the present modification will be described. FIG. 11 shows an example in which the accessory 1300 is connected to the main body 100 via the battery grip 1400 in different positional relationships. FIG. 12 is a block diagram illustrating a configuration example for determining a position to which the accessory 1300 is connected.

  In FIG. 11A, the axes of the accessory 1300 corresponding to the X-axis, Y-axis, and Z-axis of the main body 100 are the Yb-axis, Zb-axis, and Xb-axis, respectively. In FIG. 11B, the axes of the accessory 1300 corresponding to the X-axis, Y-axis, and Z-axis of the main body 100 are the Yb-axis, Zb-axis, and Xb-axis, respectively, but compared with the case of FIG. Thus, the direction vectors representing the Yb axis and the Zb axis are in opposite directions. That is, the sign of the output value of the shake detection unit 1311 corresponding to the Yb axis and the Zb axis is negative.

  In FIG. 12, the battery grip 1400 can be attached to the main body 100 of the imaging apparatus with the accessory 1300A or 1300B attached. The accessory 1300 </ b> A or 1300 </ b> B is connected to the main body 100 of the imaging device via the connection terminal portion 1103. In the battery grip 1400, the accessory 1300A is an accessory at the attachment position shown in FIG. 11A, and the accessory 1300B is an accessory at the attachment position shown in FIG. In FIG. 12, for convenience of illustration, two accessories are shown, but one of the accessories is connected to the connection terminal portion 1103 via the switch 1401.

  The system control unit 120 communicates with the battery grip 1400 via the connection position determination unit 145, the connection terminal unit 1103, and the switch 1401, and determines the connection position of the accessory 1300A or 300B.

  In this modification, the accessory 1300 having the shake detection unit 1311 can be connected to the main body 100 of the imaging apparatus via the battery grip 1400 at different positions and orientations. The system control unit 120 can acquire the correct output value of the shake detection unit 1311 by changing the sign of the output value of the shake detection unit 1311 according to the connection position and orientation of the accessory 1300.

  In the above-described embodiment, the angular velocity sensor has been described as the shake detection sensor. However, a sensor that can detect the motion of the imaging apparatus by detecting acceleration or geomagnetism may be used. As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 120 System control part 151 Shake | fluctuation detection part 152 Temperature detection part 161 Battery 163 Mounting | wearing detection part 164 Charge control part 300 Charger

Claims (13)

First detection means for detecting the temperature of the electronic device;
Second detection means for detecting a shake of the electronic device;
Third detection means for detecting that a charging means is connected to the electronic device;
Control means for controlling charging of the battery by the charging means;
Correction means for performing temperature correction on the output of the second detection means,
When it is detected by the third detection means that the charging means is connected to the electronic device, the correction means is detected by the first detection means before the charging means starts charging the battery. The output of the second detection means at the first temperature measured and the output of the second detection means at the second temperature detected by the first detection means after the charging means starts charging the battery. A temperature correction parameter is calculated from the electronic device to perform the temperature correction. When the temperature detected by the first detection means changes after the start of charging the battery by the charging means, the control means stops charging the battery by the charging means, and the correction means The electronic apparatus according to claim 1, wherein the temperature correction is performed by acquiring an output of the second detection unit at the second temperature. Timer means for measuring an elapsed time after starting charging of the battery by the charging means,
When the threshold time is measured by the timer means, the control means stops charging the battery by the charging means, and the correction means obtains the output of the second detection means at the second temperature. The electronic device according to claim 1, wherein the temperature correction is performed. The control means stops charging of the battery by the charging means when it is determined that the amount of change in battery capacity after the start of charging of the battery by the charging means is greater than or equal to a threshold, and the correction means The electronic apparatus according to claim 1, wherein the temperature correction is performed by obtaining an output of the second detection unit at a temperature of 2. The correction means performs offset correction on the output of the second detection means using the output value of the second detection means at the first temperature as a correction value. The electronic device of Claim 1. The control means starts charging the battery by the charging means after the correction value is calculated, and the correction means performs the second temperature at the second temperature after charging the battery. The electronic apparatus according to claim 5, wherein the offset correction and the temperature correction are performed by obtaining an output of a detection unit. Imaging means for imaging a subject;
An image blur correction unit that corrects an image blur of an image acquired by the imaging unit using an output of the second detection unit subjected to temperature correction by the correction unit. Item 7. The electronic device according to any one of Items 1 to 6. An electronic device using a shake detection means mounted on a battery or an external device mounted on the main body of the electronic device,
First detecting means for detecting the temperature of the electronic device;
Second detection means for detecting that a charging means is connected to the electronic device;
Control means for controlling charging of the battery by the charging means;
Correction means for performing temperature correction on the output of the shake detection means,
When it is detected by the second detection means that the charging means is connected to the electronic device, the correction means is detected by the first detection means before the charging means starts charging the battery. The temperature correction parameter is calculated from the output of the shake detection means at the first temperature and the output of the shake detection means at the second temperature detected by the first detection means after the charging means starts charging the battery. An electronic apparatus characterized by calculating the temperature and performing the temperature correction. An electronic device that can be mounted with an external device including a detecting means for detecting shake,
Connection means to which the external device is connected;
Control for obtaining the output of the detection means and the position or orientation information of the detection means in the external device via the connection means and aligning the axis set in the electronic device with the axis of the detection means And an electronic control device. The control means determines a position where the external device is connected to the electronic device, and sets a sign of an output signal of the detection means according to information on a connection position of the external device. Item 10. The electronic device according to Item 9. An external device that can be attached to the electronic device according to claim 9 or 10,
Connection means connected to the electronic device;
Control means for communicating with the electronic device via the connection means;
Detecting means for detecting a shake of the external device;
Storage means for storing information corresponding to the arrangement of the axes of the detection means,
The external control device, wherein the control means transmits the output of the detection means and the information stored in the storage means to the electronic device. Detecting the temperature of the electronic device by the first detecting means, detecting the shake of the electronic device by the second detecting means, and detecting that the charging means is connected to the electronic device by the third detecting means; When,
Controlling the charging of the battery by the charging means;
If the third detection means detects that the charging means is connected to the electronic device, the first detection means detected by the first detection means before the charging means starts charging the battery. The temperature correction parameter is obtained from the output of the second detection means at the temperature and the output of the second detection means at the second temperature detected by the first detection means after the charging means starts charging the battery. And a step of performing temperature correction on the output of the second detection means. A control method executed by an electronic device capable of mounting an external device provided with a detecting means for detecting shake,
Obtaining the output of the detection means and the position or orientation information of the detection means in the external device via a connection means;
And a step of performing control to match an axis set in the electronic device with an axis of the detecting means. An electronic device control method comprising:

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