JP2007086679A - Adapter type vibration-proof device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adapter type vibration-proof device which is externally attached to a lens device, and by which image blur correction considering a focal distance is appropriately performed without allowing a user to set the kind of the lens device to which the vibration-proof device is attached. <P>SOLUTION: In the adapter type vibration-proof device 16, vibration caused in a camera is detected by an angular velocity sensor 80, and the displacement amount (correction amount) of a vibration-proof lens 10 for negating the vibration is calculated by a CPU 84 based on an output signal from the angular velocity sensor 80. When calculating the correction amount, the CPU 84 performs amplification processing at a gain value in accordance with the focal distance of the photographic lens. The gain value is set to a value fit to the focal distance of the photographic lens based on lens ID and a zoom signal acquired from the lens device 14 and a data table stored in a memory 96. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adapter type vibration isolator, and more particularly, to an adapter type vibration isolator that is externally attached as an adapter (attached device) to a photographing lens (lens device) and corrects (prevents) image blur due to vibration.

  For example, as an anti-vibration device for a television camera, an anti-vibration lens is arranged in the photographic optical system so as to be movable within a plane perpendicular to the optical axis, and when the camera (shooting optical system) is vibrated, the image shake caused by the vibration is canceled As described above, an image stabilizing lens is driven by an actuator to correct image blur. The amount of displacement of the anti-vibration lens for canceling the image shake is calculated based on the shake signal detected by the shake detection sensor such as an angular velocity sensor, for example, by detecting the vibration applied to the camera.

  In addition, TV cameras are generally designed so that the photographic lens can be attached and detached by mounting. When using a photographic lens that does not have a built-in image stabilizer in such a lens-exchangeable camera, image blur correction is performed. An adapter type (external type) anti-vibration device (adapter type anti-vibration device) is known (for example, see Patent Document 1). According to this, when an anti-vibration device is mounted between the camera body and the photographing lens, the anti-vibration lens mounted on the anti-vibration device is incorporated as a lens element constituting the photographing optical system of the camera, and the anti-vibration device is installed. The control unit in the apparatus controls the anti-vibration lens, and image blur correction is effectively performed.

  By the way, in image blur correction using a lens apparatus equipped with a photographic lens (optical system) capable of changing the focal length, if the focal length changes, even if the magnitude of vibration generated in the camera is constant. The magnitude of image blur on the image plane is different. Therefore, it is necessary to change the amount of displacement of the image stabilizing lens for canceling image blur according to the focal length as well as the magnitude of the vibration. Conventionally, in an adapter type image stabilizer that can be applied to various lens devices, the position of a zoom lens (magnification lens) for changing the focal length is set in order to perform image blur correction in consideration of the focal length in the lens device. The zoom signal shown is acquired from the lens apparatus, and the displacement amount of the image stabilizing lens is calculated in consideration of the value of the zoom signal. Specifically, the amount of displacement of the image stabilization lens is adjusted by performing amplification processing when calculating the amount of displacement of the image stabilization lens from the shake signal, and the gain value in the amplification processing is the value of the zoom signal. Set based on.

Also, the correspondence relationship between the value of the zoom signal and the focal length is not common to all types of lens devices, and varies depending on the type of lens device. Therefore, the focal length cannot be grasped only by acquiring the zoom signal. Therefore, in order to set an appropriate gain value for the value of the zoom signal, it is necessary to specify the type of the lens device to which the adapter type image stabilizer is attached. Therefore, the conventional adapter type vibration isolator is provided with a lens selection switch operated by the user. When the type of the lens device is set by the lens selection switch, the value of the zoom signal given from the lens device of that type is set. For this, an appropriate gain value is set.
JP 2003-255426 A

  However, when setting the type of the lens device by the lens selection switch as in the conventional adapter type vibration isolator, the user forgets to mistake or set the type of the lens device to be originally set by the lens selection switch. There is a risk that proper image blur correction may not be performed.

  The present invention has been made in view of such circumstances, and is an adapter type image stabilization that can appropriately perform image blur correction considering the focal length without the user setting the type of lens apparatus to which the apparatus is to be mounted. An object is to provide an apparatus.

  In order to achieve the above object, the adapter type vibration isolator according to claim 1 is an adapter type vibration isolator externally attached to the lens device, and the vibration according to vibration applied to the optical system of the lens device. A shake detection means for outputting a signal, an image displacement means for displacing an image formed by the optical system on an image forming plane, and a shake signal output by the shake detection means are added to the optical system. Correction amount deriving means for deriving a correction amount for correcting image shake corresponding to the amount of image displacement by the image displacement means necessary for canceling image shake due to vibration, and the correction amount derived by the correction amount deriving means Image blur correction execution means for executing the image blur correction by displacing the image based on the image displacement means, and focal length information for specifying the focal length of the optical system of the lens apparatus from the lens apparatus. A focal length information acquisition unit, an amplification processing unit for performing an amplification process with a gain value suitable for a focal length of the optical system when the correction amount is derived in the correction amount deriving unit; and Gain value setting means for setting the gain value based on the focal length information acquired by the focal length information acquiring means.

  According to the present invention, since the focal length information for specifying the focal length of the optical system is obtained from the lens device, the user automatically sets the lens device type without setting the lens device type. Appropriate image blur correction is performed accordingly.

  The adapter type vibration isolator according to a second aspect is the invention according to the first aspect, wherein the focal length information includes lens identification information indicating a type of the lens device and a focal length of an optical system of the lens device. A zoom signal having a corresponding value, wherein the gain value setting means obtains a correspondence relationship between the zoom signal value and a gain value suitable for a focal length of the optical system based on the lens identification information. The gain value is obtained from the value of the zoom signal according to the correspondence, while changing according to the type of the lens device. In the present invention, lens identification information indicating the type of a lens device and a zoom signal having a value corresponding to the focal length are acquired from the lens device as focal length information for specifying a focal length. An appropriate gain value for the value of the zoom signal can be obtained by specifying the type of lens device.

  According to a third aspect of the present invention, there is provided the adapter type vibration isolator according to the second aspect of the present invention, wherein data indicating a correspondence relationship between a value of the zoom signal and a gain value suitable for a focal length of the optical system is the lens. Storage means storing each type of apparatus, wherein the gain value setting means obtains data indicating a correspondence relationship according to the type of the lens apparatus obtained from the lens identification information from the storage means, and the data The gain value corresponding to the zoom signal is obtained based on the above. The present invention stores data indicating a correspondence relationship between a zoom signal value and a gain value suitable for a focal length for each type of lens device, and sets a gain value depending on the type of lens device acquired by lens identification information. The data used for is changed.

  According to a fourth aspect of the present invention, there is provided the adapter type vibration isolator according to the first aspect of the invention, wherein the focal length information acquiring means uses the focal length of the optical system as the focal length information regardless of the type of the lens device. The gain value setting means obtains the value of the absolute zoom position where the gain value that uniquely matches the gain value is obtained, and the gain value setting means obtains the gain value in the amplification processing means by the focal length information obtaining means. It is characterized by setting a value uniquely corresponding to the value. According to the present invention, a gain value suitable for the focal length of the lens apparatus can be obtained without specifying the type of the lens apparatus, and the absolute zoom position value at which the gain value is uniquely obtained is obtained from the lens apparatus. Then, a gain value suitable for the focal length is set from the absolute zoom position value.

  According to a fifth aspect of the present invention, the adapter type vibration isolator includes a lens selection switch for selecting a type of the lens device and an optical system of the lens device according to the first, second, third, or fourth invention. Zoom signal acquisition means for acquiring a zoom signal having a value corresponding to a focal length, and the gain value setting means is configured such that when the lens device cannot acquire the lens identification information or the absolute zoom position. The correspondence relationship between the value of the zoom signal and the gain value suitable for the focal length of the optical system is changed in accordance with the type of the lens device selected by the lens selection switch, and the zoom is determined based on the correspondence relationship. The gain value is obtained from a signal value. According to the present invention, even if the lens device does not have a function of transmitting lens identification information or a value of an absolute zoom position as in the first, second, third, or fourth aspect, the lens selection is performed. An appropriate gain value can be set by selecting the type of lens device with a switch.

  According to the adapter type image stabilizer according to the present invention, it is possible to appropriately perform image blur correction considering the focal length without the user setting the type of the lens apparatus to which the present apparatus is attached.

  The best mode for carrying out the adapter type vibration isolator according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing the overall configuration of a television camera equipped with an adapter type vibration isolator according to the present invention. The TV camera 10 (hereinafter simply referred to as the camera 10) shown in FIG. 1 includes a camera body (camera head) 12, a lens device 14, and an adapter type vibration isolator 16 (hereinafter simply referred to as an anti-vibration device 16). ing. The camera body 12 includes an image pickup device (CCD or the like), picks up an image of a subject imaged by the optical system of the lens device 14 and the image stabilization device 16 by the image pickup device, and outputs a video signal by various signal processing circuits. Generate.

  The lens device 14 includes a photographing lens (optical system) that forms an image of a subject and a control system that controls focus and zoom of the photographing lens. When the image stabilizer 16 is not used, the lens barrel of the photographing lens is directly connected to the camera body 12 by a mount. The photographing lens is provided with a focus lens group for focus adjustment that moves in the optical axis direction and a zoom lens group for zoom adjustment. These lens groups are driven by, for example, a motor, and the position and operating speed of these lens groups are controlled by a control unit in accordance with an instruction from a controller (not shown).

  The anti-vibration device 16 is mounted between the lens device 14 and the camera body 12 and is optically connected to the lens barrel of the lens device 14 and the camera body 12 by mounts on the front and rear end surfaces. ing. The anti-vibration lens 40 is mounted on the anti-vibration device 16, which will be described later. The anti-vibration lens 40 is disposed in the rear stage of the photographing lens of the lens device 14, so that the anti-vibration lens 40 is added to the photographing optical system of the camera 10. Is incorporated. As will be described later, the anti-vibration lens 40 is driven by a motor in a direction orthogonal to the optical axis (up / down / left / right direction), and image blur due to vibration applied to the camera 10 is caused by It is canceled out by displacement in the vertical and horizontal directions.

  Further, between the vibration isolator 16 and the lens device 14, the required signals are exchanged as will be described later by connecting the connectors 18 and 20 provided on each of them with a cable. It is also possible to exchange signals by directly connecting connectors at the connecting portion between the image stabilizer 16 and the lens device 14.

  FIG. 2 is a front view showing the configuration of the drive mechanism of the vibration-proof lens 40 in the vibration-proof device 16. As shown in the figure, an anti-vibration lens 40 is disposed in the main body 21 of the anti-vibration device 16 while being held by a lens frame 42. The anti-vibration lens 40 is movably supported by the main body 21 through a parallel link mechanism including four arms 48, 48, 50, 50.

  The linear motor 44 (hereinafter simply referred to as the motor 44) moves the vibration-proof lens 40 in the left-right direction in the drawing, and includes a motor body 44A and a rod 44B. The motor main body 44 </ b> A is fixed to the main body 21, and the tip of the rod 44 </ b> B is engaged with the elongated hole 52 of the lens frame body 42 via a roller 54. The long hole 52 is formed on the left side of the lens frame 42 in the vertical direction in the figure, and the long hole 52 and the roller 54 are relatively movably engaged in the vertical direction in the figure.

  When the rod 44B is expanded and contracted by the driving force of the motor main body 44A, the vibration-proof lens 40 is pushed by the rod 44B or pulled by the rod 44B and moves in the left-right direction in the drawing. When a vertical force in the figure is applied to the lens frame 42, the long hole 52 is guided by the roller 54, and the vibration-proof lens 40 moves in the vertical direction in the figure.

  A connecting frame 56 is fixed to the rod 44 </ b> B of the motor 44. The connecting frame 56 is arranged in the vertical direction in the figure, the rod 44B is fixed to the center, and the upper and lower ends are slidably supported by the linear guides 58 and 58, respectively. The linear guides 58 and 58 are provided in parallel with the rod 44B, and when the rod 44B is expanded and contracted, the connecting frame 56 translates in the left-right direction while maintaining its posture.

  The distal end of the detection contact needle 60 </ b> B of the position sensor 60 is pressed against the connection frame 56. The position sensor 60 detects the amount of movement of the connecting frame 56 that is fixed to the main body 21 at the position where the detection contact needle 60B is parallel to the rod 44B and moves in parallel by the expansion and contraction of the rod 44B. Thereby, the position of the anti-vibration lens 40 in the left-right direction is detected. Reference numeral 62A denotes a bobbin constituting the speed generator 62, and reference numeral 62B denotes a core constituting the speed generator 62. The core 62B is fixed to the connecting frame 56.

  On the other hand, the linear motor 46 (hereinafter simply referred to as the motor 46) moves the vibration-proof lens 40 in the vertical direction in the figure, and includes a motor body 46A and a rod 46B. The motor main body 46 </ b> A is fixed to the main body 21, and the tip of the rod 46 </ b> B is engaged with the elongated hole 64 of the lens frame body 42 via a roller 66. The long hole 64 is formed in the left-right direction in the figure at the lower part of the lens frame 42, and thus the long hole 64 and the roller 66 are relatively movably engaged in the left-right direction in the figure.

  When the rod 46B expands and contracts by the driving force of the motor body 46A, the lens frame 42 is pushed by the rod 46B or pulled by the rod 46B and moves in the vertical direction in the figure. Further, when a horizontal force in the drawing is applied to the lens frame 42, the long hole 64 is guided by the roller 66, and the vibration-proof lens 40 moves in the horizontal direction in the drawing.

  A connecting frame 68 is fixed to the rod 46 </ b> B of the linear motor 46. The connecting frame 68 is disposed in the left-right direction in the figure, the rod 46B is fixed to the center, and the left and right ends are slidably supported by the linear guides 70, 70, respectively. The linear guides 70 and 70 are provided in parallel with the rod 46B. When the rod 46B is expanded and contracted, the connecting frame 68 moves in parallel up and down while maintaining its posture.

  The distal end of the detection contact needle 72B of the position sensor 72 is pressed against the connection frame 68. The position sensor 72 detects the amount of movement of the connecting frame 68 where the sensor main body 72A is fixed to the main body 21 at a position where the detection contact needle 72B is parallel to the rod 46B and moves in parallel by the expansion and contraction of the rod 46B. As a result, the vertical position of the anti-vibration lens 40 is detected. Reference numeral 74A denotes a bobbin constituting the speed generator 74, and reference numeral 74B denotes a core constituting the speed generator 74. The core 74B is fixed to the connecting frame 68.

  FIG. 3 is a block diagram showing the configuration of the control system of the image stabilizer 16. This figure shows a control system configuration for correcting image blur in the left-right direction (horizontal direction) as the configuration of the control system of the image stabilizer 16. The configuration and processing of the control system that corrects the image shake in the vertical direction (vertical (vertical) direction) are the same as those in the horizontal direction, and thus description thereof is omitted. As shown in FIG. 2, the anti-vibration lens 40 is supported in the photographing optical system of the camera 10 so as to be movable in the horizontal and vertical directions within a plane perpendicular to the optical axis. In addition, the motor (linear motor) 44 is driven in the horizontal direction, and when the camera 10 is vibrated in the horizontal direction, the anti-vibration lens 40 is moved in the horizontal direction by the motor 44 and the image is moved. The position is moved to a position for correcting shake (a position for canceling image shake due to vibration).

  The angular velocity sensor 80 is a gyro sensor installed as a shake detection sensor for detecting horizontal vibration generated in the camera 10, and the angular velocity sensor 80 has a voltage corresponding to the angular velocity of vibration generated in the horizontal direction. An electric signal is output as an angular velocity signal (a shake signal). The vibration isolator 16 is also equipped with an angular velocity sensor for detecting vertical vibration generated in the camera 10.

  The angular velocity signal output from the angular velocity sensor 80 is converted into a digital signal by the A / D converter 82 and input to the CPU 84. In the figure, processing blocks corresponding to the processing contents executed by the CPU 84 are shown. The angular velocity signal input to the CPU 84 is integrated by an integration processing unit 90 that performs arithmetic processing of a digital filter, for example. As a result, the angular velocity signal is converted into an angle signal (position signal). The angle signal obtained by the integration processing unit 90 is subsequently input to the amplification processing unit 92 and subjected to amplification processing with a gain value suitable for the focal length of the photographing lens of the lens device 14 as will be described in detail later. Thus, a correction amount for correcting image blur is obtained. Then, the correction amount obtained by the amplification processing unit 92 is output from the CPU 84 to the D / A converter 86 as the value of the control signal indicating the horizontal movement target position of the image stabilizing lens 40.

  The control signal output from the CPU 84 to the D / A converter 86 is converted into an analog signal by the D / A converter 86 and then input to the motor drive circuit 88. The motor drive circuit 88 drives the motor 44 that moves the image stabilizing lens 40 in the horizontal direction, and refers to the detected value of the position sensor 60 (not shown in FIG. 3) shown in FIG. The image stabilizing lens 40 is moved to a position corresponding to the value (correction amount) of the control signal output from. As a result, image blur due to vibration applied to the camera 10 is corrected.

  Subsequently, the processing in the CPU 84 will be described in detail. As described above, the value of the angular velocity signal (angular velocity value) sequentially input from the angular velocity sensor 80 to the CPU 84 is first subjected to integration processing by the digital filter calculation processing in the integration processing unit 90. Thus, the value (angle value) of the angle signal (position signal) is obtained from the angular velocity value.

  The angle value obtained by the integration processing unit 90 is subsequently amplified by the amplification processing unit 92 with a predetermined gain value. As a result, a correction amount for correcting the image blur by canceling the image blur caused by the vibration of the camera 10, that is, a displacement amount of the image stabilizing lens 40 necessary for correcting the image blur is obtained.

  Here, when the lens device 14 has a zoom function and the focal length of the photographing lens can be changed, the magnitude of image blur caused by the vibration of the camera 10 varies depending on the focal length of the photographing lens. Accordingly, the amount of displacement from the reference position of the image stabilizing lens 40 for canceling the image blur (the correction amount for correcting the image blur by canceling the image blur) also differs depending on the focal length. For example, the magnitude of image blur with respect to a certain amount of vibration increases as the focal length increases (zoom becomes telephoto). Therefore, the amount of displacement of the anti-vibration lens 40 for canceling the image blur increases as the focal length increases.

  Therefore, the amplification processing unit 92 in the CPU 84 sets a gain value suitable for the focal length of the photographing lens, and amplifies the angle signal obtained from the integration processing unit 90 with the gain value. As shown in the figure, the CPU 84 of the image stabilization device 16 has a lens ID (lens identification information for identifying the type of the lens device 14) indicating the type of the lens device 14 from the lens device 14, and shooting of the lens device 14. A zoom signal indicating the current zoom position of the lens can be acquired, and the lens ID and the zoom signal are read by the gain determination unit 94 in the CPU 84.

  Here, in the present embodiment, the lens ID is given from the control system of the lens device 14 to the CPU 84 of the image stabilizer 16 by serial communication, for example, and the zoom signal is output as an analog signal from the control system of the lens device. It is assumed that the signal is converted into a digital signal by an A / D converter (not shown) and supplied to the CPU 84 of the image stabilizer 16. However, the signal transmission method for the image stabilizer 16 to acquire these lens ID and zoom signal from the lens device 14 is not limited to this.

  The zoom signal is output from the lens device 14 as a voltage signal having a voltage value (2.5 V to 7.5 V) corresponding to the focal length of the photographing lens of the lens device 14. The correspondence relationship is not common to all types of lens devices, but is unique to each type of lens device. That is, the focal length of the photographing lens when the zoom signal has a specific value varies depending on the type of the lens device 14.

  The gain determination unit 94 in the CPU 84 of the image stabilization device 16 sets the gain value based on the zoom signal acquired from the lens device 14 so that the gain value set in the amplification processing unit 92 becomes a gain value suitable for the focal length. decide. At this time, the following processing is executed.

  First, regardless of the type of the lens device 14, a value having a certain correspondence with the focal length of the photographing lens is referred to as an absolute value zoom position (value). That is, even when the types of lens devices are different, if the focal lengths are the same, the zoom position represented by the matched value is referred to as an absolute zoom position. As the value of the absolute zoom position, for example, the value of the focal length itself may be used, or a value having an arbitrary relationship with the focal length such as a value having a linear or nonlinear relationship with the focal length can be assumed. .

  By assuming such an absolute zoom position, a gain value suitable for the focal length having a fixed relationship with the absolute zoom position is uniquely obtained for the absolute zoom position value, and the gain determination unit 94 The gain value to be set by the amplification processing unit 92 with respect to the absolute zoom position value can be obtained by a predetermined relational expression or by referring to a data table created in advance.

  On the other hand, the correspondence between the value of the zoom signal obtained from the lens device 14 and the focal length is unique for each type of lens device 14, and the gain determination unit 94 determines the value of the zoom signal obtained from the lens device 14. Is converted to the absolute zoom position value. The memory 96 stores zoom position table data for converting the value of the zoom signal into the value of the absolute zoom position for each lens ID representing the type of the lens device 14, and the gain determining unit 94 includes the lens device. The zoom position table data corresponding to the lens ID acquired from 14 is read from the memory 96, and the zoom signal value is converted into the absolute zoom position value using the zoom position table data. Thus, the gain value to be set by the amplification processing unit 92 is obtained by converting the value of the zoom signal obtained from the lens device 14 into the value of the absolute zoom position.

  The above-described processing of the gain determination unit 94 automatically determines the type of the lens device 14 and refers to appropriate zoom position table data so that an appropriate gain value is obtained for the value of the zoom signal obtained from the lens device 14. However, there is a case where the lens device 14 used in the camera 10 does not have a function of transmitting the lens ID to the image stabilization device 16. For this case, the image stabilization device 16 includes the type of the lens device 14. Is provided with a lens selection switch 98 for manually designating. When the lens ID cannot be obtained from the lens device 14, the gain determination unit 94 reads the type of the lens device 14 selected by the lens selection switch 98 and reads the zoom position table data corresponding to the type from the memory 96. The gain value is calculated.

  FIG. 4 is a flowchart showing the processing procedure of the main routine in the CPU 84 of the image stabilizer 16. First, the CPU 84 reads an angular velocity signal from the angular velocity sensor 80 (step S10). Then, an integration process is performed to obtain an angle signal (step S12). Next, gain determination processing is performed to calculate a gain value (step S14). Subsequently, amplification processing with the gain value is performed to calculate the displacement amount of the image stabilizing lens 40 (step S16), and the calculated displacement amount value is output to the D / A converter 86 as a control signal (step S16). S18). By repeating this process, image blur due to vibration generated in the camera 10 is corrected.

  FIG. 5 is a flowchart showing a detailed procedure of the gain determination process in step S14. When starting the gain determination process, the CPU 84 first determines whether or not the lens device 14 has a function of transmitting a lens ID (step S20). If it is determined YES, it is subsequently determined whether or not reading of the lens ID from the lens device 14 has already been performed (step S22). If NO is determined, the lens ID is read from the lens device 14 (step S24). Then, the zoom position data table corresponding to the lens ID is read from the memory 96 (step S30). If it is determined as YES in step S22, the processing of step S24 and step S30 has already been completed. Therefore, the processing proceeds to step S32 without performing these processing.

  If NO in step S20, that is, if it is determined that the lens device 14 does not have a function of transmitting a lens ID, it is determined whether or not the lens selection switch 98 has been switched (step S26). If YES is determined, the type of the lens device selected by the lens selection switch 98 is read (step S28). Even when the process of this flowchart is executed for the first time, YES is determined in step S26. Then, a zoom position data table corresponding to the type of lens device selected by the lens selection switch 98 is read from the memory 96 (step S30).

  On the other hand, if it is determined as NO in step S26, the processing of step S28 and step S30 has already been completed, and thus the processing proceeds to step S32 without performing these processing.

  When the process of step S30 is completed, if it is determined YES in step S22, or if it is determined NO in step S26, the CPU 84 receives a zoom signal from the lens device 14 (step S32). ). Subsequently, with reference to the zoom position data table read from the memory 96 in step S30, the value of the zoom signal is converted into the value of the absolute zoom position (step S34). Then, a gain value corresponding to the value of the absolute zoom position is determined (step S36). When the above process ends, the process returns to the process of the flowchart of FIG.

  Through the above processing, an appropriate gain value corresponding to the focal length of the photographing lens is set regardless of the type of the lens device 14.

  Next, another embodiment of the control system in the vibration isolator 16 according to the present invention will be described. FIG. 6 is a block diagram showing the configuration of another embodiment. In this figure, the same reference numerals as those in FIG. 3 are assigned to the same or similar components as those in FIG. 3, and detailed description thereof is omitted. In the figure, it is assumed that the value of the absolute zoom position, in which the correspondence relationship with the focal length is determined in advance, is given from the lens device 14 to the gain determination unit 94 in the CPU 84 by serial communication, for example. In this case, the process of converting the value of the zoom signal into the value of the absolute zoom position in accordance with the type of the lens device 14 as in the configuration of FIG. 3 is not necessary. The method for transmitting the absolute zoom position signal from the lens device 14 to the image stabilizer 16 is not limited to serial communication, and any method may be used.

  FIG. 7 is a flowchart showing the procedure of gain determination processing of the CPU 84 in FIG. Also in this embodiment, the CPU 84 executes the processing of the main routine shown in FIG. 4, and the gain determination processing in step S14 is executed according to the processing procedure of the flowchart of FIG. 7 described below. When starting the gain determination process, the CPU 84 first determines whether or not the lens device 14 has a function of transmitting an absolute zoom position signal (step S50). If YES is determined, the absolute value zoom position value is subsequently received from the lens device 14 (step S52), and a gain value corresponding to the absolute value zoom position value is determined (step S36). .

  On the other hand, if it is determined as NO in step S50, it is determined whether or not the lens selection switch 98 has been switched (step S54). If YES is determined, the type of the lens device selected by the lens selection switch 98 is read (step S56). Even when the process of this flowchart is executed for the first time, YES is determined in step S54. Then, a zoom position data table corresponding to the type of lens device selected by the lens selection switch 98 is read from the memory 96 (step S58). On the other hand, if it is determined as NO in step S54, the processing of step S56 and step S58 has already been completed, and thus the processing proceeds to step S60 without performing these processing.

  In step S60, the CPU 84 receives a zoom signal specific to the lens device 14 from the lens device 14 (step S60). Subsequently, referring to the zoom position data table read from the memory 96 in step S58, the value of the zoom signal is converted into the value of the absolute zoom position (step S62). Then, a gain value corresponding to the value of the absolute zoom position is determined (step S64). When the above process ends, the process returns to the process of the flowchart of FIG.

  As described above, in the above-described embodiment, the image displacing means for intentionally displacing the imaging position of the image formed by the optical system in the horizontal or vertical direction within the imaging plane by displacing the vibration-proof lens 40. The image displacement is corrected by displacing the image so that the image blur due to the vibration applied to the camera 10 is canceled by the image displacement means. Thus, the image displacing means for intentionally displacing the image does not have to use the image stabilizing lens 40 as in the present embodiment.

  In the above embodiment, the zoom signal value acquired from the lens device 14 is converted into the absolute zoom position value using the zoom position data table corresponding to the type of the lens device, and the absolute zoom position value is converted. Although the gain value corresponding to the value is set, the present invention is not limited to this. For example, a data table indicating the correspondence between zoom signal values and gain values is stored in the memory 96 for each type of lens device, and a data table corresponding to the type of lens device 14 used in the camera 10 is used. Thus, the gain value may be obtained directly from the value of the zoom signal acquired from the lens device 14.

  Moreover, although the said embodiment demonstrated the case where the vibration applied to the camera 10 was detected by the angular velocity sensor and the correction amount was calculated based on the angular velocity signal output from the angular velocity sensor, the vibration applied to the camera 10 was described. Detected by shake detection means other than the angular velocity sensor, such as an angular acceleration sensor, acceleration sensor, speed sensor, angular displacement sensor, or displacement sensor, and corrected based on the shake signal output from the shake detection means in response to the vibration The present invention can also be applied when calculating the quantity.

FIG. 1 is a schematic diagram showing the overall configuration of a television camera equipped with an adapter type vibration isolator according to the present invention. FIG. 2 is a front view showing the configuration of the drive mechanism of the vibration-proof lens in the adapter-type vibration-proof device according to the present invention. FIG. 3 is a block diagram showing the configuration of the control system in the adapter type vibration isolator according to the present invention. FIG. 4 is a flowchart showing the procedure of the main routine in the CPU of the adapter type vibration isolator according to the present invention. FIG. 5 is a flowchart showing the procedure of gain determination processing in the CPU of the adapter type vibration isolator according to the present invention. FIG. 6 is a block diagram showing the configuration of another embodiment of the control system in the adapter type vibration isolator according to the present invention. FIG. 7 is a flowchart showing the procedure of gain determination processing in the CPU of the adapter type vibration isolator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Television camera, 12 ... Camera body, 14 ... Lens apparatus, 16 ... Adapter type vibration isolator (vibration isolator), 40 ... Anti-vibration lens, 44 ... Motor, 80 ... Angular velocity sensor, 84 ... CPU, 90 ... Integration Processing unit, 92 ... Amplification processing unit, 98 ... Lens selection switch

Claims (5)

An adapter type vibration isolator externally attached to the lens device,
A shake detection means for outputting a shake signal corresponding to the vibration applied to the optical system of the lens device;
Image displacing means for displacing an image formed by the optical system on an image forming plane;
A correction amount for image blur correction corresponding to an image displacement amount by the image displacement unit necessary to cancel image blur due to vibration applied to the optical system based on a shake signal output by the shake detection unit. Correction amount deriving means for deriving;
An image blur correction execution unit that performs the image blur correction by displacing the image by the image displacement unit based on the correction amount derived by the correction amount deriving unit;
Focal length information acquisition means for acquiring focal length information for specifying the focal length of the optical system of the lens device from the lens device;
Amplification processing means for performing amplification processing with a gain value suitable for the focal length of the optical system when the correction amount is derived in the correction amount deriving means;
Gain value setting means for setting the gain value in the amplification processing means based on the focal length information acquired by the focal length information acquiring means;
An adapter type vibration isolator characterized by comprising:   The focal length information is lens identification information indicating the type of the lens device, and a zoom signal having a value corresponding to the focal length of the optical system of the lens device, and the gain value setting means is a value of the zoom signal. And the gain corresponding to the focal length of the optical system is changed according to the type of the lens device obtained from the lens identification information, and the value of the zoom signal is changed according to the correspondence. The adapter type vibration isolator according to claim 1, wherein a gain value is obtained.   Storage means for storing data indicating a correspondence relationship between the value of the zoom signal and a gain value suitable for the focal length of the optical system for each type of the lens device, and the gain value setting means includes the lens identification The data indicating the correspondence relationship according to the type of the lens device obtained from the information is acquired from the storage means, and the gain value corresponding to the zoom signal is obtained based on the data. Adapter type anti-vibration device.   The focal length information acquisition means acquires, as the focal length information, an absolute zoom position value at which a gain value that uniquely matches the focal length of the optical system is obtained regardless of the type of the lens device, and the gain 2. The adapter type according to claim 1, wherein the value setting means sets the gain value in the amplification processing means to a value uniquely corresponding to the value of the absolute zoom position acquired by the focal length information acquisition means. Anti-vibration device. A lens selection switch for selecting the type of the lens device;
Zoom signal acquisition means for acquiring a zoom signal having a value corresponding to the focal length of the optical system of the lens device;
With
The gain value setting means, when the lens device cannot acquire the lens identification information or the absolute zoom position, a value of the zoom signal and a gain value suitable for the focal length of the optical system. The correspondence relationship is changed according to the type of the lens device selected by the lens selection switch, and the gain value is obtained from the value of the zoom signal by the correspondence relationship. Or 4 adapter type vibration isolator.

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