JP2012230330A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause collision noise and the like, emitted when the calibrating operation of a blur correction lens is performed, to be lost among driving noise and the like emitted during the initialization of the lens barrel.SOLUTION: When the power source of a camera 1 is turned on, a lens barrel 3 projects to a predetermined projection position, and when the power source is turned off, the lens barrel 3 is stored in a storage position. When the power source of the camera 1 is turned on, a control section 22 drives the lens barrel 3 from the storage position to the projection position through a predetermined position, thereby initiating the lens barrel 3. The predetermined position is the position of the lens barrel 3 when a blur correction lens 32 starts the calibrating operation. The control section 22 starts the calibrating operation of the blur correction lens 32 after the lens barrel 3 passes through the predetermined position, and decreases the driving speed of the lens barrel 3 so that the initiation of the lens barrel 3 finishes almost at the same time as the calibrating operation of the blur correction lens 32.

Description

  The present invention relates to a camera having an optical camera shake correction function.

  2. Description of the Related Art A camera having a retractable lens barrel is known that has an optical camera shake correction function. In a camera equipped with a retractable lens barrel, when the power of the camera is turned on, the lens barrel is drawn out from the storage position and initialized to a state where it can be photographed. In addition, in a camera having an optical image stabilization function, when the camera is turned on, a calibration operation is performed to adjust the position of the image stabilization lens used for the optical image stabilization function, thereby ensuring the accuracy of the image stabilization mechanism. There is a way.

  It is known that in the calibration operation of the shake correction lens, the shake correction lens is brought into contact with both ends of the movable restriction frame, so that a collision sound and vibration are generated. Patent Document 1 describes that by appropriately setting control parameters when starting up the camera, the speed of collision with the movable restriction frame is reduced in the calibration operation of the shake correction lens, and the collision sound is reduced.

JP 2008-197209 A

  It is difficult to completely eliminate collision noise and vibration in the calibration operation of the shake correction lens. Therefore, an object of the present invention is to divide the collision sound and vibration in the calibration operation of the shake correction lens into the driving sound and vibration when the lens barrel is initialized.

  The camera according to the present invention has a zoom optical system and a shake correction optical system, and protrudes to a predetermined protruding position when the camera power is turned on, and retracts and is stored in the storage position when the camera power is turned off. A lens barrel, a zoom mechanism for driving the lens barrel in the optical axis direction to drive the zoom optical system in the optical axis direction, and a shake correction mechanism for driving the shake correction optical system in a direction orthogonal to the optical axis direction The lens barrel initialization means for initializing the lens barrel by driving the lens barrel from the retracted position through the predetermined position to the protruding position when the camera power is turned on; and the lens barrel is predetermined After passing through the position, the shake correction initialization means for initializing the shake correction mechanism, and the driving speed of the lens barrel are decelerated, and the timing when the lens barrel initialization means completes the driving of the lens barrel. The shake correction initialization means It is characterized in that it and a speed control means for substantially matching the complete timing initialization correction mechanism.

  A collision sound or the like generated when the shake correction lens is calibrated can be mixed with a driving sound or the like generated by initialization of the lens barrel.

It is a block diagram which shows the example of 1 structure of the camera by this invention. (A) The lens barrel storage position in the camera according to the present invention, (b) the position of the shake correction lens when the lens barrel is in the storage position, and (c) the start position of the calibration operation of the shake correction lens. FIG. FIG. 4 is a diagram illustrating (a) a position where the initialization of the lens barrel is completed and (b) a zoom driving range of the lens barrel in the camera according to the present invention. It is an example of the flowchart regarding initialization of the lens barrel and calibration of the shake correction lens, which is executed in the camera according to the present invention.

  A configuration of a camera according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram for explaining a configuration of a camera according to an embodiment of the present invention. A camera 1 shown in FIG. 1 includes a camera body 2 and a retractable lens barrel 3. The camera body 2 includes an imaging device 21, a control unit 22, a lens barrel drive unit 23, a lens barrel position detection unit 24, a Yaw direction shake detection unit 25, a Pitch direction shake detection unit 26, and an operation unit. 27.

  The lens barrel 3 includes a zoom lens 31, a shake correction lens 32, a plurality of optical systems such as a focusing lens 33, a shake correction lens position detection unit 34, and a shake correction lens drive unit 35. The lens barrel 3 is driven by a lens barrel drive unit 23 of the camera body 2. When the lens barrel 3 is driven, the positions of the zoom lens 31 and the focusing lens 33 in the optical axis direction change.

  FIG. 2A shows the position of the lens barrel 3 when the camera 1 is powered off. When the camera 1 is off, the lens barrel 3 is housed in the camera body 2. Hereinafter, the position where the lens barrel 3 is housed in the camera body 2 as shown in FIG.

  FIG. 2B shows the position of the shake correction lens 32 in the lens barrel 3 in the storage position. When the lens barrel 3 is in the retracted position as shown in FIG. 2B, the shake correction lens 32 is the optical axis of the lens barrel 3 (in FIG. 2B, the center of the lens barrel 3). It is in the position retracted from. A polygon 200 surrounding the shake correction lens 32 indicates the movable range of the shake correction lens 32 when the lens barrel 3 is in the storage position. When the lens barrel 3 is in the storage position, the movable range of the shake correction lens 32 is limited to the outer frame of the lens barrel 3.

  When the camera 1 is turned on, initialization of the lens barrel 3 is started. The lens barrel 3 is driven by the lens barrel drive unit 23 and gradually protrudes from the camera body 2. At this time, the shake correction lens 32 rotates around the center point 201 shown in FIG. 2B in conjunction with the driving of the lens barrel 3. When the lens barrel 3 is driven to a predetermined position, the shake correction lens 32 moves to the position shown in FIG. The movable range of the shake correction lens 32 moved to the position of FIG. 2C is not limited by the outer frame of the lens barrel 3, and is a range indicated by an octagon 202 in FIG.

  When the lens barrel 3 passes through the predetermined position and is extended to a predetermined protruding position (for example, the wide end) shown in FIG. 3A, the initialization of the lens barrel 3 is completed. The camera 1 after the initialization of the lens barrel 3 is ready for photographing.

  FIG. 3B shows a driving range 300 in which the lens barrel 3 can be driven during photographing after the initialization of the lens barrel 3 is completed. During shooting, the lens barrel 3 is driven within the driving range 300 by the lens barrel driving unit 23, whereby the position of the zoom optical system such as the zoom lens 31 and the focusing lens 33 in the optical axis direction changes.

  The shake correction lens position detection unit 34 outputs to the control unit 22 an output corresponding to the position of the shake correction lens 32. The shake correction lens position detection unit 34 is configured by, for example, a pair of a position detection magnet and a Hall element. The control unit 22 detects the position of the shake correction lens 32 based on the output of the shake correction lens position detection unit 34.

  The shake correction lens driving unit 35 moves the shake correction lens 32 in a direction 203 orthogonal to the optical axis. The shake correction lens driving unit 35 is composed of, for example, a pair of voice coil motors. Each of the pair of voice coil motors has a drive magnet and a coil, and moves the shake correction lens 32 by energizing the coils. The shake correction lens 32 is driven in a direction 203 orthogonal to the optical axis by the shake correction lens driving unit 35 to correct blurring of the subject image on the image sensor 21. That is, the subject image is deflected by the correction optical system to correct the imaging position of the subject image on the image sensor 21 to correct the image blur.

  The imaging element 21 of the camera body 2 is a CCD or CMOS, captures a subject image formed by an optical system provided in the lens barrel 3, and outputs an imaging signal to the control unit 22. The control unit 22 includes a CPU, a memory, and other peripheral circuits. The memory constituting the control unit 22 includes SDRAM, flash memory, and the like. The SDRAM is a volatile memory, and is used for applications such as a work memory for developing a program when the CPU executes a program and a buffer memory for temporarily storing data. The flash memory is a non-volatile memory, and stores a program executed by the CPU, parameters read when the program is executed, and the like.

  The lens barrel driving unit 23 is configured by a motor capable of PWM (Pulse Width Modulation) control, and drives the lens barrel 3. The lens barrel driving unit 23 has its duty ratio set by the control unit 22 and drives the lens barrel 3 at a driving speed corresponding to the set duty ratio.

  The lens barrel position detection unit 24 detects the driving amount of the lens barrel 3 by the lens barrel driving unit 23. For example, the driving amount of the lens barrel 3 is detected by counting pulse signals generated by the motor rotation of the lens barrel driving unit 23.

  The Yaw direction shake detection unit 25 is a gyro for detecting yawing of the camera 1 main body, that is, lateral shake. The pitch direction shake detection unit 26 is a gyro for detecting pitching of the camera 1 body, that is, vertical direction shake. The Yaw direction shake detection unit 25 and the Pitch direction shake detection unit 26 output the detection results to the control unit 22, respectively. The control unit 22 calculates the shake amount of the camera 1 based on the outputs of the Yaw direction shake detection unit 25 and the Pitch direction shake detection unit 26. Then, shake correction is performed by moving the shake correction lens 32 by a movement amount corresponding to the calculated shake amount in a direction to cancel the shake of the camera 1.

  The operation unit 27 includes various operation members operated by the user, such as a power switch, a release switch, and a zoom switch. If the power switch is operated while the camera 1 is turned off, the camera 1 is turned on.

  Next, the calibration operation of the shake correction lens 32 will be described. When the shake correction lens 32 rotates and moves to the position of FIG. 2C during the initialization of the lens barrel 3, the control unit 22 controls the shake correction lens drive unit 35 to start the calibration operation of the shake correction lens 32. Let Whether or not the shake correction lens 32 has reached the position of FIG. 2C is detected by the lens barrel position detection unit 24 because the rotation of the shake correction lens 32 is linked to the driving of the lens barrel 3. The determination can be made based on the driving amount of the lens barrel 3. For example, it is determined whether or not the number of pulses counted by the lens barrel position detection unit 24 has reached a predetermined number of pulses P1 or more. The predetermined number P1 is determined in advance, and is stored as a parameter in the flash memory of the control unit 22.

  In the calibration operation of the shake correction lens 32, the shake correction lens driving unit 35 moves the shake correction lens 32 to both ends of the movable range. Then, the correspondence between the output of the shake correction lens position detection unit 34 and the position of the shake correction lens 32 at this time is calibrated. At this time, a member (not shown) provided in the shake correction lens 32 collides with the inside of the lens barrel 3, and a collision sound or the like is generated.

  The control unit 22 performs deceleration control of the driving speed of the lens barrel 3 so that the timing at which the initialization of the lens barrel 3 is completed substantially coincides with the timing at which the calibration operation of the shake correction lens 32 is completed. When the lens barrel 3 is initialized while a collision sound or the like is generated in accordance with the calibration operation of the shake correction lens 32, the drive sound generated when the lens barrel 3 is initialized causes the drive sound generated by the shake correction lens 32. Impinges the impact sound that accompanies the calibration operation.

  When the shake correction lens 32 reaches the position shown in FIG. 2C and the calibration operation of the shake correction lens 32 is started, the control unit 22 controls the driving speed of the lens barrel 3 to be reduced. The driving speed of the lens barrel 3 can be reduced by setting the duty ratio of the lens barrel driving unit 23 small. For example, the duty ratio of the lens barrel driving unit 23 is set to 100% until the shake correction lens 32 reaches the position shown in FIG. 2C after the initialization of the lens barrel 3 is started. After 32 reaches the position of FIG. 2 (c), an appropriate duty ratio (for example, 40%) measured in the design stage in advance is set.

  FIG. 4 is an example of a flowchart relating to the initialization of the lens barrel 3 and the calibration operation of the shake correction lens 32 that is executed by the control unit 22 when the power of the camera 1 is turned on.

  In step S <b> 401, the control unit 22 controls the lens barrel position detection unit 24 to start detecting the driving amount of the lens barrel 3. For example, the lens barrel position detector 24 starts counting pulse signals generated by the motor rotation of the lens barrel driver 23.

  In step S402, the control unit 22 sets the duty ratio of the lens barrel driving unit 23 to 100%, for example, and starts the initialization of the lens barrel 3. When the initialization of the lens barrel 3 is started, the control unit 22 advances the process to step S403.

  In step S403, the control unit 22 determines whether or not the driving amount of the lens barrel 3 detected by the lens barrel position detection unit 24 is equal to or greater than a predetermined amount that allows the calibration operation of the shake correction lens 32 to be started. It is determined whether or not the shake correction lens 32 has reached the position of FIG. 2C by rotational movement about the center point 201. For example, it is determined whether or not the number of pulses counted by the lens barrel position detector 24 is equal to or greater than a predetermined number of pulses P1. The control unit 22 repeats the determination process of step S403 until the determination of step S403 is positive, and when the determination is positive, the process proceeds to step S404.

  In step S <b> 404, the control unit 22 controls the shake correction lens driving unit 35 to start the calibration operation of the shake correction lens 32. In step S405, the control unit 22 reduces the duty ratio of the lens barrel driving unit 23 to a predetermined setting value (for example, 40%) so that the initialization of the lens barrel 3 is performed as a calibration operation of the shake correction lens 32. The driving speed of the lens barrel 3 is decelerated so as to complete simultaneously.

  In step S406, the control unit 22 determines whether or not the initialization of the lens barrel 3 has been completed. For example, the lens barrel position detection unit 24 determines whether or not a predetermined number P2 or more of pulse signals generated by the motor rotation of the lens barrel driving unit 23 have been counted. The predetermined number P2 is the number of pulses required to extend the lens barrel 3 to a predetermined value as shown in FIG. 3A, and is stored as a parameter in the flash memory of the control unit 22 like the predetermined number P1. Yes. The control unit 22 repeats step S406 until it is determined that the initialization of the lens barrel 3 is completed, and when it is determined that the initialization of the lens barrel 3 is completed, the processing of FIG.

According to each embodiment explained above, the following operation effect is produced.
The camera 1 includes a lens barrel 3 having a zoom lens 31 and a focusing lens 33 and a shake correction lens 32. The lens barrel 3 protrudes to the protruding position of FIG. 3A when the power is turned on by the power switch included in the operation unit 27, and is stored to the storage position of FIG. 2A when the power is turned off. Is done. The lens barrel 3 is driven in the optical axis direction by the lens barrel driving unit 23, and the zoom lens 31 and the focusing lens 33 are driven in the optical axis direction in accordance with the driving. The shake correction lens 32 is driven in a direction orthogonal to the optical axis direction by the shake correction lens driving unit 35. When the power source of the camera 1 is turned on, the control unit 22 drives the lens barrel 3 from the storage position (FIG. 2A) through the predetermined position to the protruding position (FIG. 3A). The lens barrel 3 is initialized. The predetermined position is the position of the lens barrel 3 when the shake correction lens 32 that has been rotated and moved around the center point 201 in conjunction with the driving of the lens barrel 3 reaches the position of FIG. is there. The controller 22 starts the calibration operation of the shake correction lens 32 after the lens barrel 3 has passed the predetermined position (step S404 in FIG. 4). The control unit 22 decelerates the driving speed of the lens barrel 3 so that the initialization of the lens barrel 3 is completed almost simultaneously with the calibration operation of the shake correction lens 32 (step S405 in FIG. 4). Thereby, a collision sound or the like generated when the shake correction lens 32 is calibrated can be mixed with a driving sound or the like generated by the initialization of the lens barrel 3.

Each of the above embodiments can be modified as follows.
The protruding position where the initialization of the lens barrel 3 is completed is not limited to the wide end. For example, the tele end may be used. Alternatively, the user of the camera 1 may freely set the protruding position within the zoom driving range 300 using the operation unit 27. Furthermore, the position of the lens barrel 3 when the power of the camera 1 is turned off may be stored in the flash memory of the control unit 22, and the position may be set as the protruding position. Here, when the camera 1 is turned off, the user operates the power switch when the camera 1 is turned on, or the user operates the operation unit 27 for a predetermined time (5 minutes) or longer. For example, when not.

In the above embodiment, the duty ratio of the lens barrel driving unit 23 is set to a value measured at the design stage of the camera 1. However, the control unit 22 uses a timer (not shown) to count the time t0 required for the lens barrel 3 to drive from the protruding position to the predetermined position (position where the shake correction lens 32 starts the calibration operation). Based on the time t0, the driving speed of the lens barrel 3 after step S405 may be calculated and set to the corresponding duty ratio. For example, the driving speed v1 of the lens barrel 3 after deceleration may be calculated using Equation (1). Note that v0 in Expression (1) is a driving speed when the lens barrel 3 is initialized in step S402. t1 is the time required to initialize the lens barrel 3 when the lens barrel 3 is driven at the driving speed v0. T2 is the time required for the calibration operation of the shake correction lens 32. For the time t1, a value measured at the design stage of the camera 1 may be stored in a flash memory or the like of the control unit 22, or an equation (2) based on the time t0, the predetermined pulse number P1, and the pulse number P2. ). For the time t2, a value measured at the design stage of the camera 1 may be stored in a flash memory of the control unit 22 or the like.
v1 = ((t1−t0) / t2) × v0 (1)
t1 = (P2 / P1) × t0 (2)

  In the above embodiment, the lens barrel 3 is driven at a predetermined driving speed after decelerating in step S405. However, the lens barrel 3 passes through the predetermined position until it reaches the protruding position. You may perform control which changes a drive speed in a period. For example, the driving speed of the lens barrel 3 may be gradually reduced at a predetermined rate, or may be gradually reduced.

  The present invention can also be applied to a camera having a lens barrel in which the shake correction lens is already in the position of FIG. 2C when the lens barrel is in the retracted position.

  Each embodiment and various modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. For example, the embodiments and various modifications may be arbitrarily combined and executed without departing from the characteristics of the invention.

DESCRIPTION OF SYMBOLS 1 Camera 2 Camera body 3 Lens barrel 21 Image pick-up element 22 Control part 23 Lens barrel drive part 24 Lens barrel position detection part 32 Shake correction lens 34 Shake correction lens position detection part 35 Shake correction lens drive part

Claims (3)

A lens barrel that has a zoom optical system and a shake correction optical system, protrudes to a predetermined protruding position when the camera power is turned on, and retracts to a stored position when the camera power is turned off; ,
A zoom mechanism for driving the lens barrel in the optical axis direction and driving the zoom optical system in the optical axis direction;
A shake correction mechanism for driving the shake correction optical system in a direction perpendicular to the optical axis direction;
Lens barrel initialization means for initializing the lens barrel by driving the lens barrel from a storage position to a protruding position through a predetermined position when the camera power is turned on;
Shake correction calibration means for calibrating the shake correction mechanism after the lens barrel passes through the predetermined position;
The timing at which the lens barrel initialization unit completes driving of the lens barrel is reduced by decelerating the driving speed of the lens barrel, and the timing at which the shake correction calibration unit completes calibration of the shake correction mechanism. Speed control means to match,
A camera comprising: The camera of claim 1,
A camera, further comprising: a protruding position setting means for setting the protruding position within a range driven by the lens barrel during photographing. The camera according to claim 2,
The protruding position setting means sets the position of the lens barrel at the protruding position when the lens barrel starts retreating to the storage position when the camera power is turned off. camera.

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