JP2005265448A - Acceleration detecting apparatus, photographic apparatus, temperature correction method, lens drive rate correction method, shutter drive control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect the attitudes within a wide temperature range, even if a semiconductor triaxial acceleration sensor is used, to prevent lens focus variations due to attitude differences, and to reduce the changes in exposure due to attitude differences of a shutter. <P>SOLUTION: In a photographing apparatus provided with the focusing function of automatically driving a taking lens for acquiring photographed images in focus, the semiconductor triaxial acceleration sensor 2 detects accelerations independent from one anther in three directions, converts them into electrical signals, and output them. A temperature detection apparatus 8 detects the temperature of the vicinity of the semiconductor triaxial acceleration sensor 2. A control circuit 1 corrects the electrical signals outputted from the semiconductor triaxial acceleration sensor 2 by the temperature detected by the temperature detection apparatus 8 and corrects a drive rate of the taking lens in the focusing function, on the basis of the corrected electric signals. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an acceleration detection device, a photographing device, a temperature correction method, a lens drive amount correction method, a shutter drive control method, and a program, and in particular, an acceleration detection device including a triaxial acceleration detection means, and a temperature applied to the device Correction method, photographing apparatus having a focusing function for automatically driving a photographing lens to obtain a focused photographed image, a lens driving amount correction method applied to the apparatus, a photographing apparatus provided with a shutter, and the apparatus The present invention relates to a shutter drive control method to be applied, and a program for causing a computer to execute these methods.

  FIG. 11 is a cross-sectional side view of a conventional photographing apparatus including a zoom mechanism and a focus adjustment mechanism. This photographing apparatus is any one of a silver salt film camera, a digital camera, a video camera, and the like, and FIG. 11 mainly shows the inside of a lens barrel portion that holds a photographing lens.

  Reference numeral 31 denotes a camera body, which incorporates a film or an image sensor, a control circuit for controlling the operation of the photographing apparatus, and the like. Reference numeral 32 denotes a lens barrel portion, which incorporates a photographing lens. When the photographer operates a zoom switch (not shown) for the purpose of changing the photographing magnification, the control circuit detects it and rotates the zoom motor in a predetermined direction. The lens barrel drive mechanism (not shown) converts this rotational motion into a motion in the front-rear direction (left-right direction in FIG. 11), and the entire lens barrel portion 32 is extended or retracted from the camera body portion 31. The focal length is changed. Reference numerals 33 and 34 denote a part of the photographing lens included in the lens barrel portion 32. Reference numeral 35 denotes a holding member for the lens 34, which has a structure that can be moved inside the lens barrel by a lens driving mechanism (not shown). That is, the distance between the lens 34 and the lens 33 can be changed, and by changing this distance, it is possible to focus on a subject from a short distance to an infinite distance.

  In the lens barrel portion 32 having such a structure, the lens 34 is in a standby position closest to the film or the image sensor during standby, and the distance to the subject measured by the control circuit using a distance measuring device (not shown) during shooting. Then, the movement amount of the lens 34 is calculated from the focal length of the photographing lens, and the holding member 35 is moved by a lens driving mechanism (not shown) by the calculated movement amount. That is, it is possible to bring a desired subject into focus by the above operation.

  By the way, when shooting with the camera body 31 tilted, as shown in FIGS. 12A and 12B, force is applied in the driving direction or the non-driving direction of the lens 34 due to the influence of gravity. FIG. 12 is a diagram showing gravity applied to the lens 34 when the photographing apparatus shown in FIG. 11 is tilted.

  Since the driving mechanism of the lens 34 has backlash and backlash, if the lens 34 receives gravity in a direction different from normal due to the tilt of the camera body 31, the stop position of the lens 34 can be stopped at a normal position. As a result, the subject image is out of focus on the film surface or the image sensor surface. The applicant has made a proposal for solving such a problem (see Patent Document 1). According to this proposal, posture detecting means for detecting the posture of the photographing apparatus is provided, and the operation of the lens driving mechanism is controlled in accordance with the detection result of the posture detecting means.

Also, as a general shutter device, there may be a problem that the opening characteristics when the shutter curtain opens depending on the posture in which it is placed, but it is especially installed in or near a photographic lens group called a lens shutter. Shutters are widely used in imaging devices that require downsizing, and the shutter curtain speed changes due to the difference in orientation between the normal position (horizontal position) and the vertical position, and it is devised to obtain a stable exposure amount. For example, Patent Document 2 discloses a structure of a lens shutter with a small posture difference.
JP-A-6-300962 Japanese Patent Laid-Open No. 7-5519

  However, when a semiconductor triaxial acceleration sensor is employed as the attitude detection means disclosed in Patent Document 1, the ambient temperature of the semiconductor triaxial acceleration sensor becomes a problem. That is, the signal output of the semiconductor triaxial acceleration sensor has a large temperature dependency, and has a disadvantage that the temperature change of the offset component is particularly large. On the other hand, in an imaging device or the like, posture detection is performed by detecting a change in the direct current component of the triaxial acceleration sensor, and therefore, the temperature change of the offset reduces the accuracy of posture detection.

  In addition, the structure disclosed in Patent Document 2 that reduces the change in the exposure amount due to the difference in the posture of the lens shutter becomes complicated and requires adjustment of the spring balance, which is problematic in terms of cost and size. .

  The present invention has been made in view of such problems. Even when a semiconductor triaxial acceleration sensor is used, the posture can be accurately detected under a wide temperature range, and fluctuation due to a difference in posture of the lens focus is prevented. Another object of the present invention is to provide an acceleration detection device, a photographing device, a temperature correction method, a lens drive amount correction method, a shutter drive control method, and a program in which a change in exposure amount due to a difference in shutter posture is reduced.

  To achieve the above object, according to the first aspect of the present invention, there is provided a triaxial acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electrical signals, and outputting the electric signals; An acceleration detection apparatus comprising: temperature detection means for detecting an ambient temperature; and correction means for correcting an electric signal output from the three-axis acceleration detection means with a temperature detected by the temperature detection means. Is provided.

  According to the third aspect of the present invention, in the photographing apparatus having a focusing function for automatically driving the photographing lens to obtain a focused photographed image, three independent accelerations are detected and electric A triaxial acceleration detecting means for converting the signal into a signal, a temperature detecting means for detecting a temperature around the triaxial acceleration detecting means, and an electric signal output from the triaxial acceleration detecting means by the temperature detecting means. A temperature correction unit that corrects the detected temperature according to the detected temperature; and a driving amount correction unit that corrects the driving amount of the photographing lens in the focusing function based on the electrical signal corrected by the temperature correction unit. An imaging device is provided.

  According to a fifth aspect of the present invention, in a photographing apparatus provided with a shutter, triaxial acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electrical signals and outputting them, and the triaxial acceleration detection Temperature detecting means for detecting the temperature around the means, temperature correcting means for correcting the electrical signal output from the three-axis acceleration detecting means by the temperature detected by the temperature detecting means, and correction by the temperature correcting means There is provided a photographing apparatus comprising drive control means for performing drive control of the shutter based on the electrical signal.

  According to the invention of claim 9, in the temperature correction method applied to the acceleration detection device including the triaxial acceleration detection means that detects accelerations in three directions independent from each other, converts them into electric signals, and outputs them. A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means; and a correcting step for correcting an electric signal output from the triaxial acceleration detecting means by the temperature detected by the temperature detecting step. A temperature correction method is provided.

  According to the eleventh aspect of the present invention, the triaxial acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electric signals and outputting them, and the photographing lens automatically for obtaining a focused photographed image. In a lens driving amount correction method applied to a photographing apparatus having a focusing function that is driven to a temperature, a temperature detecting step for detecting a temperature around the triaxial acceleration detecting means, which is output from the triaxial acceleration detecting means A temperature correction step for correcting the electrical signal based on the temperature detected by the temperature detection step, and a drive amount correction for correcting the drive amount of the photographing lens in the focusing function based on the electrical signal corrected by the temperature correction step. And a lens driving amount correction method.

  According to the twelfth aspect of the present invention, a shutter drive applied to a photographing apparatus including a triaxial acceleration detecting means that detects accelerations in three directions independent from each other, converts them into electrical signals and outputs them, and a shutter. In the control method, a temperature detection step for detecting a temperature around the three-axis acceleration detection means, and a temperature correction for correcting an electrical signal output from the three-axis acceleration detection means by the temperature detected by the temperature detection step. There is provided a shutter drive control method comprising: a step; and a drive control step for performing drive control of the shutter based on the electric signal corrected in the temperature correction step.

  Furthermore, a program for causing a computer to execute each of the above methods is provided.

  According to the present invention, the electrical signal output from the triaxial acceleration detection means that detects accelerations in three directions independent from each other, converts them into electrical signals and outputs them is corrected by the ambient temperature of the triaxial acceleration detection means.

  This makes it possible to accurately detect the attitude of the device equipped with the triaxial acceleration detection means under a wide temperature range.

  In addition, the electrical signal output from the triaxial acceleration detecting means is corrected by the ambient temperature of the triaxial acceleration detecting means, the posture of the photographing apparatus is obtained based on the corrected electric signal, and the orientation of the photographing apparatus is determined based on this posture. The photographing lens drive amount in the focus function is corrected. In addition, based on this attitude, drive control of the shutter of the photographing apparatus is performed.

  As a result, it is possible to prevent the lens focus from fluctuating due to the difference in posture of the photographing apparatus. In addition, a change in exposure amount due to a difference in the posture of the shutter can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  Prior to the description of the photographing apparatus according to the present invention, first, a three-axis acceleration sensor used in the photographing apparatus will be described. In addition, as for the triaxial acceleration sensor using a semiconductor material, many structural features and application examples have been filed in the past. For example, Japanese Patent Application Laid-Open No. 10-132845 and Japanese Patent Application Laid-Open No. 10-111111 have disclosed the structure and manufacture. There is a proposal regarding the above, and Japanese Patent Laid-Open No. 2002-296663 discloses a proposal in which a triaxial acceleration sensor is applied to a camera. Hereinafter, a typical structure of a known three-axis acceleration sensor and an acceleration detection mechanism will be described with reference to FIGS.

  FIG. 3 is a cross-sectional view showing the structure of a semiconductor acceleration sensor used in a three-axis acceleration sensor.

  The semiconductor type acceleration sensor includes a semiconductor base portion 28 made of single crystal silicon, pedestals 27a and 27b that support the semiconductor base portion 28, diaphragms 26a and 26b provided on the semiconductor base portion 28, It comprises a weight 25 and piezoresistors R1, R2, R3, R4. The diaphragm 26 has a thickness of several μm so that it can be easily deformed, and the diaphragm 26 is deformed when acceleration is applied to the weight 25. The piezoresistors R1, R2, R3, R4 are installed on the opposite side of the semiconductor substrate 28 from the installation side of the diaphragm 26. When the diaphragm 26 is deformed, the piezoresistors R1, R2, R3, R4 are The amount of deformation is converted into an electrical signal. The piezoresistors R1, R2, R3, and R4 change their resistance values due to the stress generated in the semiconductor base material portion 28 due to the deformation of the diaphragm 26, and the semiconductor acceleration sensor detects a mechanical change as a voltage signal. Convert to

  In the triaxial acceleration sensor, in order to detect acceleration in each of XYZ directions orthogonal to each other, three semiconductor acceleration sensors as shown in FIG. 3 are installed corresponding to each direction. A circuit configuration of such a triaxial acceleration sensor will be described with reference to FIG.

  FIG. 4 is a diagram illustrating an electrical circuit configuration of the three-axis acceleration sensor.

  In FIG. 4, reference numeral 2 denotes a triaxial acceleration sensor, and reference numerals 21 to 23 denote semiconductor acceleration sensor bridge circuits corresponding to XYZ directions. R1X, R2X, R3X, and R4X in the bridge circuit 21 are piezoresistors for detecting acceleration in the X direction corresponding to the piezoresistors R1, R2, R3, and R4 shown in FIG. Similarly, R1Y, R2Y, R3Y and R4Y in the bridge circuit 22 are piezoresistors for detecting acceleration in the Y direction corresponding to the piezoresistors R1, R2, R3 and R4 shown in FIG. R1Z, R2Z, R3Z, and R4Z in the circuit 23 are piezoresistors for detecting acceleration in the Z direction corresponding to the piezoresistors R1, R2, R3, and R4 shown in FIG. Piezoresistors R1X, R2X, R3X, R4X, piezoresistors R1Y, R2Y, R3Y, R4Y, and piezoresistors R1Z, R2Z, R3Z, R4Z form a bridge circuit, and each bridge circuit has an input terminal VDD, A DC reference voltage is applied via GND, and the output terminal of each bridge circuit is connected to each output terminal X + OUT, X-OUT, Y + OUT, Y-OUT, Z + OUT, Z-OUT.

  FIG. 5 is a diagram illustrating a signal output from a semiconductor acceleration sensor that detects acceleration in the X-axis direction.

  As shown in FIG. 5A, the piezoresistors R1X, R2X, R3X, R4X are arranged in a straight line in the X-axis direction on the XY plane, and acceleration is applied to the weight 25 in the X-axis direction. As shown in FIG. 5B, the resistance value changes in response to stress in the tension or compression direction. As a result, a voltage corresponding to the magnitude of acceleration is output between the output terminals X + OUT and X-OUT shown in FIG.

  In FIG. 5, the case where the acceleration in the X-axis direction is detected has been described, but the same applies to the case where the acceleration in the Y-axis direction is detected. The piezoresistors R1Y, R2Y, R3Y, R4Y In other words, when acceleration is applied to the weight 25 in the Y-axis direction, a voltage corresponding to the magnitude of the acceleration is output between the output terminals Y + OUT and Y-OUT shown in FIG.

  FIG. 6 is a diagram for explaining a signal output from a semiconductor acceleration sensor that detects acceleration in the Z-axis direction.

  As shown in FIG. 6A, the piezoresistors R1Z, R2Z, R3Z, R4Z are arranged in a substantially straight line in an arbitrary direction on the XY plane (the piezoresistors R2Z, R3Z are closer to the weight 25, (Piezoresistors R1Z and R4Z are arranged on the side far from the weight 25), and acceleration is applied to the weight 25 in the Z-axis direction, as shown in FIG. The resistance value changes under stress. As a result, a voltage corresponding to the magnitude of acceleration is output between the output terminals Z + OUT and Z-OUT shown in FIG.

  By the way, the acceleration applied to the three-axis acceleration sensor changes with time except for gravity, and due to the elasticity of the diaphragm 26 and the like, each output terminal X + OUT, X-OUT, Y + OUT, Y- Signals output from OUT, Z + OUT, and Z-OUT vibrate. The frequency of this vibration falls within the range of 1 to 100 Hz.

  FIG. 7 is a diagram illustrating a state in which acceleration in each of XYZ directions is applied to the above-described semiconductor acceleration sensor. FIG. 8 is a semiconductor equation in which the amplitude (output level) changes according to the magnitude of acceleration. It is a figure which shows the vibration output signal of an acceleration sensor.

  On the other hand, gravitational acceleration is constantly applied to the triaxial acceleration sensor. Therefore, when the attitude of the semiconductor acceleration sensor is tilted, each output terminal X + OUT, X-OUT, Y + OUT, Y-OUT, Z + OUT, Z-OUT The direct current component of the signal output from 1 indicates a value corresponding to the slope.

  FIG. 9 is a diagram showing a semiconductor acceleration sensor with a tilted attitude, and FIG. 10 is a diagram showing an output signal of the semiconductor acceleration sensor with a tilted attitude.

  As shown in FIG. 9, in a state where the semiconductor acceleration sensor is tilted on the XZ plane, an output signal resulting from the component force of the force mg due to the gravitational acceleration applied to the weight 25 is output from the semiconductor acceleration sensor in the X and Z directions. Is output. That is, as shown in FIG. 10, an output signal having only an output level having an output level corresponding to the inclination angle and no vibration is obtained.

  As can be seen from FIGS. 8 and 10, in the triaxial acceleration sensor, acceleration information can be obtained from an alternating current component that changes with time in the output signals in XYZ directions. Attitude information can be obtained from a direct current component that does not change. That is, the signal extracted from the output signal of the triaxial acceleration sensor through a high-pass filter that passes a frequency higher than 1 Hz indicates acceleration information, and the signal extracted through a low-pass filter that passes a frequency of 1 Hz or less is an attitude. Information is shown.

  Next, a photographing apparatus according to the present invention equipped with such a triaxial acceleration sensor will be described.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a photographing apparatus according to the present invention equipped with a three-axis acceleration sensor. In the present embodiment, two triaxial acceleration sensors are provided at the base and tip of the lens barrel, and the photographing apparatus is any one of a silver salt film camera, a digital camera, a video camera, and the like.

  In FIG. 1, reference numeral 1 denotes a control circuit for controlling the overall operation of the photographing apparatus, a CPU as a central processing unit, a mask ROM in which firmware for control is written, an EEPROM as a nonvolatile memory, and each arithmetic processing It is composed of a RAM, an A / D converter, a D / A converter, and the like that hold time data. The control circuit 1 has a function of detecting various operation switches (not shown), and operates the photographing apparatus according to the switch operated by the photographer. The control circuit 1 further includes a signal processing function of a digital filter such as a high pass and a low pass for an input analog signal, and temperature characteristic correction data of a semiconductor triaxial acceleration sensor described later.

  Reference numeral 2 denotes a semiconductor triaxial acceleration sensor. As described above, two are provided at the base and the tip of the lens barrel portion of the photographing apparatus (see FIG. 5 of JP-A-1-130143). Each semiconductor triaxial acceleration sensor is arranged with the X axis in the width direction of the imaging apparatus, the Y axis in the height direction, and the Z axis in parallel with the imaging optical axis. In FIG. 1, two semiconductor triaxial acceleration sensors are collectively expressed as a semiconductor triaxial acceleration sensor 2, and an acceleration sensor, which will be described later, receives output signals from the two semiconductor triaxial acceleration sensors in the XYZ directions. The amplifier 3 is also expressed by one.

  Reference numeral 3 denotes an acceleration sensor amplifier, which includes a differential amplifier that receives output signals in two directions of the XYZ axes from the two semiconductor triaxial acceleration sensors 2 and a low-pass filter. That is, two differential amplifiers for receiving signals from the output terminal X-OUT and the output terminal X + OUT for detecting acceleration in the X-axis direction, and an output terminal Y- for detecting the acceleration degree in the Y-axis direction. Two differential amplifiers for inputting signals from OUT and output terminal Y + OUT, and two differential amplifiers for inputting signals from output terminal Z-OUT and output terminal Z + OUT for detecting acceleration in the Z-axis direction And a low-pass filter that passes only a signal having a frequency of 100 Hz or less from the output signal of each differential amplifier. This low-pass filter removes a noise component contained in the output signal from the semiconductor triaxial acceleration sensor 2.

  The output signal of each differential amplifier that has passed through the low-pass filter is sent to the control circuit 1 and is taken in as acceleration information and posture information in each axial direction via a built-in A / D converter.

  Reference numeral 4 denotes a motor drive circuit which controls a zoom motor 4a for changing the focal length of the photographing lens and a lens motor 4b for driving a focusing lens for forming a subject image on a film or an image sensor surface. The circuit is operated based on an instruction from the circuit 1. Further, when the image recording medium of the photographing apparatus is a film, the motor drive circuit 4 includes a feeding motor 4c, and controls the film loading and unwinding operations of the film loaded in the photographing apparatus. Do.

  A shutter drive circuit 5 opens and closes a shutter mechanism (not shown) based on an instruction from the control circuit 1 in order to give an appropriate exposure amount to the film and the image sensor. Specifically, the current flowing through the shutter coil is turned on only during the period instructed by the control circuit 1. Note that the period during which this current flows can also be set and changed from the control circuit 1.

  Reference numeral 6 denotes a photometric circuit for measuring the brightness of the subject and its surroundings.

  Reference numeral 7 denotes a vibration isolator, which includes a correction optical system that can move freely in two orthogonal directions within a plane perpendicular to the optical axis of the photographic lens, and the control circuit 1 uses the semiconductor triaxial acceleration sensor as the correction optical system. By driving according to the output signal from 2, the blur of the captured image due to the vibration of the imaging device at the time of imaging is removed (see Japanese Patent Laid-Open No. 1-130143).

  Reference numeral 8 denotes a temperature detection device, which includes a temperature sensor installed inside the photographing apparatus and an amplifier that amplifies the output signal and sends the amplified signal to the control circuit 1. The control circuit 1 takes in an output signal from the temperature detection device 8 via an A / D converter, refers to calibration information recorded in an EEPROM which is an internal nonvolatile memory, and determines the temperature around the temperature sensor. Get the temperature information shown. This calibration information is calculated from the output signal of the temperature detection device 8 at the time of manufacturing the imaging device and the temperature around the imaging device actually measured, and is written in the EEPROM. Used to calibrate the detected temperature to the actual temperature.

  Reference numeral 9 denotes a distance measuring device that obtains data that can be converted into a distance to the subject and sends the data to the control circuit 1. The control circuit 1 calculates the distance to the subject from the data and stores it as the distance to the subject.

  Reference numeral 10 denotes a strobe device. The control circuit 1 instructs charging of a main capacitor (not shown) in the strobe device 10 at the photographing preparation stage of the present photographing device. When the charging of the main capacitor is completed, the strobe device 10 sends it to the control circuit 1. Tell. The control circuit 1 causes the Xe discharge tube 10a to emit light at an appropriate timing after operating the shutter driver circuit 5 when photographing a subject darker than a predetermined brightness.

  The operation of the photographing apparatus having the above configuration will be described with reference to FIG.

  FIG. 2 is a flowchart showing the procedure of the control process of the photographing apparatus executed by the control circuit 1. Hereinafter, it demonstrates along step number (S).

  S1: When a main switch (not shown in FIG. 1) is operated, the photographing apparatus is powered on to start preparation for photographing. When the reset state of each unit is released and the control circuit 1 becomes operable, the control circuit 1 proceeds to step S2. As described above, the strobe device 10 completes charging of the main capacitor at this time.

  S2: The control circuit 1 waits for the switch SW1 to be turned on. The switch SW1 is a switch connected to the control circuit 1 that is turned on when a release button (not shown) is pushed down to the first stroke (half-pressed state). When the switch SW1 is turned on, the process proceeds to step S3.

  S3: The control circuit 1 operates the photometry circuit 6 and the distance measurement circuit 9, obtains information about the brightness of the subject from the photometry circuit 6, and obtains information about the distance from the distance measurement circuit 9 to the subject.

  S4: The control circuit 1 acquires a signal from one of the two semiconductor triaxial acceleration sensors 2 from the acceleration sensor amplifier 3. Further, information on the ambient temperature is obtained from the temperature detection device 8. On the other hand, in a part of the nonvolatile memory EEPROM of the control circuit 1, data for correcting the temperature characteristic of the offset output of the semiconductor triaxial acceleration sensor 2 for each temperature region is written in advance when the photographing apparatus is manufactured.

  The control circuit 1 reads out the temperature correction data of the offset output corresponding to the ambient temperature information obtained from the temperature detection device 8 with reference to the nonvolatile memory EEPROM, and obtained from the acceleration sensor amplifier 3 using the temperature correction data. A correction operation is performed on the signal data. Then, the control circuit 1 obtains posture information of the photographing apparatus using the corrected data. Specifically, the control circuit 1 performs a correction operation using the temperature correction data on the output signal of the semiconductor triaxial acceleration sensor 3 limited to a frequency band of 100 Hz or less sent from the acceleration sensor amplifier 3. After that, the sample is sampled at a sampling frequency of 200 Hz or more, converted into a digital value by an A / D converter, and further subjected to a digital filter operation to extract only a frequency component of 1 Hz or less to obtain posture information.

  S5: The control circuit 1 determines whether or not the switch SW2 is in the ON state. The switch SW2 is a switch connected to the control circuit 1 that is turned on when the release button is pushed down to the second stroke longer than the first stroke (fully pressed state). If the switch SW2 is in the ON state, the process proceeds to step S6, and if not, the process returns to step S2.

  S6: The control circuit 1 calculates the amount of movement of the focusing lens 34 from the standby position based on the distance information to the subject obtained in step S3 and the attitude information of the photographing apparatus acquired in step S4. The lens motor 4b is rotated via the motor drive circuit 4 to drive the focusing lens 34 by the calculated movement amount.

  Note that the control circuit 1 has correction data for the lens movement amount with respect to the inclination of the optical axis of the photographing apparatus in advance in the internal ROM area for each focal length of the photographing lens. This correction data corrects inaccuracies in the amount of movement of the focusing lens 34 due to the inclination of the photographing apparatus with respect to the optical axis. The control circuit 1 obtains the inclination of the photographing optical axis from the posture information, and reads correction data of the lens movement amount according to the focal length of the photographing lens and the inclination of the photographing optical axis with reference to the internal ROM area. . Then, the control circuit 1 calculates the amount of movement of the focusing lens 35 according to the inclination of the optical axis from the read correction data and the distance to the subject.

  S7: The control circuit 1 sets the X-axis direction component and the Y-axis direction component to 200 Hz or more among the signals of the two semiconductor triaxial acceleration sensors 2 limited to the frequency band of 100 Hz or less sent from the acceleration sensor amplifier 3. Are sampled at a sampling frequency of A, converted into a digital value by an A / D converter, and further subjected to a digital filter operation to extract a frequency component greater than 1 Hz. Using these signals, the control circuit 1 detects the acceleration of the photographing apparatus in a plane perpendicular to the photographing optical axis of the photographing apparatus. Then, driving of the image stabilizer 7 is started so as to cancel blurring of the subject image using the detected acceleration.

  S8: The control circuit 1 determines the optimum shutter opening time from the information about the brightness of the subject obtained at step S3 and the information about the attitude of the photographing apparatus obtained at step S4, and passes through the shutter drive circuit 5. To open and close the shutter.

  In the built-in ROM area of the control circuit 1, the same shutter curtain speed command is used for the shutter curtain speed that is executed when the photographing apparatus is set in the normal position (horizontal position). A correction value for correcting the fluctuation of the shutter curtain speed that is executed when the camera is held is stored in advance. The control circuit 1 determines whether the posture of the photographing apparatus is the normal position or the vertical position from the posture information. If the position is the vertical position, the control circuit 1 reads the correction value from the built-in ROM area and sets the correction value to the shutter opening time. Add

  When the brightness of the subject is dark compared to the predetermined value, the control circuit 1 causes the Xe discharge tube 10a to emit light at an appropriate timing during the opening of the shutter so as to obtain an appropriate exposure amount.

  S9: The operation of the vibration isolator 7 is stopped at the timing when the shutter is fully closed, and returned to a predetermined standby position.

  S10: It is determined whether or not the photographing apparatus is a camera using a silver salt film. If it is a silver salt film camera, the process proceeds to step S11. If it is not a silver salt film camera, the process proceeds to step S12.

  S11: The control circuit 1 rotates the feeding motor 4c through the motor drive circuit 4, winds up the film by one frame, and stops.

  S12: In a camera provided with an image sensor and a medium for recording image information, the subject image formed on the image sensor is converted into an electrical signal, and the signal is recorded on the recording medium.

  As described above, in this embodiment, by providing the semiconductor acceleration sensor and the temperature detection device, the driving amount of the focusing lens is determined according to the posture of the photographing device, and the inclination of the photographing device with respect to the optical axis is determined. The inaccuracy of the moving amount of the focusing lens due to the above can be eliminated. Further, it is possible to correct a variation in shutter opening time with respect to the horizontal position when the photographing apparatus is held in the vertical position.

[Other Embodiments]
In step S8 in FIG. 2, the exposure amount is corrected by changing the shutter opening time. Instead, the exposure amount is corrected by increasing or decreasing the shutter current to change the shutter opening characteristic. You may make it do.

  Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus. It is also achieved by reading and executing the program code stored in the storage medium.

  In this case, the program code itself read from the storage medium realizes the novel function of the present invention, and the storage medium and program storing the program code constitute the present invention.

  The storage medium for supplying the program code is, for example, a flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW. DVD + RW, magnetic tape, nonvolatile memory card, ROM, etc. can be used.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) or the like running on the computer based on the instruction of the program code. Includes a case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing.

  Further, after the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This includes the case where the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

It is a block diagram which shows the structure of one Embodiment of the imaging device which concerns on this invention carrying a triaxial acceleration sensor. It is a flowchart which shows the procedure of the control processing of the imaging device performed with a control circuit. It is sectional drawing which shows the structure of the semiconductor type acceleration sensor used for a triaxial acceleration sensor. It is a figure which shows the electrical circuit structure of a triaxial acceleration sensor. It is a figure explaining the signal output from the semiconductor type acceleration sensor which detects the acceleration of a X-axis direction. It is a figure explaining the signal output from the semiconductor type acceleration sensor which detects the acceleration of a Z-axis direction. It is a figure which shows the state in which the acceleration of each direction of XYZ was added with respect to the semiconductor type acceleration sensor. It is a figure which shows the vibration output signal of the semiconductor type acceleration sensor from which an amplitude (output level) changes according to the magnitude | size of an acceleration. It is a figure which shows the semiconductor-type acceleration sensor which attitude | position inclined. It is a figure which shows the output signal of the semiconductor type acceleration sensor in which the attitude | position was inclined. It is a sectional side view of the conventional imaging device provided with the zoom mechanism and the focus adjustment mechanism. It is a figure which shows the gravity concerning a focusing lens when the imaging device shown in FIG. 11 is tilted.

Explanation of symbols

1. Control circuit (correction means, temperature correction means, drive amount correction means, drive control means)
2. Semiconductor triaxial acceleration sensor (triaxial acceleration detection means)
DESCRIPTION OF SYMBOLS 3 ... Acceleration sensor amplifier 4 ... Motor drive circuit 5 ... Shutter drive circuit 6 ... Photometry circuit 7 ... Vibration isolator 8 ... Temperature detection apparatus (temperature detection means)
DESCRIPTION OF SYMBOLS 9 ... Distance measuring device 10 ... Strobe device 21 ... Bridge circuit of semiconductor type acceleration sensor corresponding to X-axis direction 22 ... Bridge circuit of semiconductor type acceleration sensor corresponding to Y-axis direction 23 ... Semiconductor type acceleration corresponding to Z-axis direction Sensor bridge circuit 25 ... Weight 26a, 26b ... Diaphragm 27a, 27b ... Base 28 ... Semiconductor substrate 31 ... Shooting device body 32 ... Lens barrel 33 ... Part of taking lens 34 ... Part of taking lens (combined) Focusing lens)
35 ... Lens holding member R1-R4 ... Piezoresistor

Claims (15)

Three-axis acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electrical signals, and outputting them,
Temperature detecting means for detecting the temperature around the triaxial acceleration detecting means;
An acceleration detection apparatus comprising: correction means for correcting an electrical signal output from the three-axis acceleration detection means by a temperature detected by the temperature detection means.   2. The acceleration detection apparatus according to claim 1, wherein the correction unit corrects the fluctuation of the DC component of the electrical signal in accordance with the temperature around the triaxial acceleration detection unit. In a photographing apparatus having a focusing function for automatically driving a photographing lens to obtain a focused photographed image,
Three-axis acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electrical signals, and outputting them,
Temperature detecting means for detecting the temperature around the triaxial acceleration detecting means;
Temperature correction means for correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection means;
An imaging apparatus comprising: a driving amount correcting unit that corrects a driving amount of the imaging lens in the focusing function based on the electrical signal corrected by the temperature correcting unit. The drive amount correction means includes
Attitude detection means for detecting the attitude of the photographing device based on the DC component of the electrical signal corrected by the temperature correction means;
The photographing apparatus according to claim 3, further comprising: a correction unit that corrects a driving amount of the photographing lens in the focusing function according to the posture detected by the posture detection unit. In a photographic device with a shutter,
Three-axis acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electrical signals, and outputting them,
Temperature detecting means for detecting the temperature around the triaxial acceleration detecting means;
Temperature correction means for correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection means;
An imaging apparatus comprising: drive control means for performing drive control of the shutter based on the electrical signal corrected by the temperature correction means. The drive control means includes
Attitude detection means for detecting the attitude of the photographing device based on the DC component of the electrical signal corrected by the temperature correction means;
The photographing apparatus according to claim 5, further comprising: a control unit that performs drive control of the shutter according to the posture detected by the posture detection unit.   6. The photographing apparatus according to claim 3, wherein the temperature correction unit corrects the fluctuation of the DC component of the electrical signal in accordance with the temperature around the triaxial acceleration detection unit. .   6. The photographing according to claim 3, further comprising a blur correcting unit that corrects a blur of a photographed image of the photographing device based on an AC component of an electric signal output from the three-axis acceleration detecting unit. apparatus. In a temperature correction method applied to an acceleration detection device including a triaxial acceleration detection means that detects accelerations in three directions independent from each other, converts them into electrical signals, and outputs them,
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A temperature correction method comprising: a correction step of correcting an electric signal output from the three-axis acceleration detection means based on the temperature detected in the temperature detection step.   The temperature correction method according to claim 9, wherein the correction step corrects the fluctuation of the direct current component of the electrical signal in accordance with the temperature around the triaxial acceleration detecting means. An imaging device having triaxial acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electric signals and outputting them, and a focusing function for automatically driving a photographing lens to obtain a focused photographed image In the lens driving amount correction method applied to
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A temperature correction step of correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection step;
A lens driving amount correction method comprising: a driving amount correction step of correcting a driving amount of the photographing lens in the focusing function based on the electrical signal corrected in the temperature correction step. In a shutter drive control method applied to a photographing apparatus including a triaxial acceleration detection means that detects acceleration in three directions independent from each other, converts them into electrical signals, and outputs them, and a shutter,
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A temperature correction step of correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection step;
And a drive control step of performing drive control of the shutter based on the electrical signal corrected by the temperature correction step. In a program for causing a computer to execute a temperature correction method applied to an acceleration detection device including a triaxial acceleration detection unit that detects accelerations in three directions independent of each other, converts them into electrical signals, and outputs them.
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A correction step of correcting an electric signal output from the three-axis acceleration detection means with the temperature detected in the temperature detection step. An imaging device having triaxial acceleration detecting means for detecting accelerations in three directions independent from each other, converting them into electric signals and outputting them, and a focusing function for automatically driving a photographing lens to obtain a focused photographed image In a program for causing a computer to execute a lens driving amount correction method applied to
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A temperature correction step of correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection step;
A drive amount correction step of correcting a drive amount of the photographing lens in the focusing function based on the electric signal corrected by the temperature correction step. In a program for causing a computer to execute a shutter drive control method applied to an imaging device including a triaxial acceleration detection means that detects accelerations in three directions independent from each other, converts them into electrical signals, and outputs them, and a shutter. ,
A temperature detecting step for detecting a temperature around the triaxial acceleration detecting means;
A temperature correction step of correcting the electrical signal output from the triaxial acceleration detection means by the temperature detected by the temperature detection step;
A drive control step for performing drive control of the shutter based on the electrical signal corrected by the temperature correction step.

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