JP3855112B2 - Support structure for camera lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for an image stabilization lens for a camera, and more particularly to a support structure for a correction lens that corrects image blur caused by vibration applied to the camera.
[0002]
[Prior art]
Conventionally, a camera equipped with this type of correction lens supports the correction lens in a lens barrel of the camera so as to be movable in a plane orthogonal to the photographing optical axis, and in a direction to cancel the vibration when the camera is subjected to vibration. Image blurring is corrected by moving the correction lens with an actuator. Further, the camera detects the movement position of the correction lens by a position sensor, and based on the detected movement position of the correction lens, the camera moves the actuator so that the correction lens is positioned at a normal position for canceling vibration. Feedback control.
[0003]
[Problems to be solved by the invention]
However, the conventional correction lens support structure detects the movement position of the correction lens by directly contacting the detection contact of the position sensor with the peripheral surface of the lens frame of the correction lens. Depending on the direction, there is a problem that the contact point of the position sensor is displaced or slipped from the lens frame. As a result, the conventional support structure for the correction lens has a drawback that the movement position of the correction lens may not be accurately detected.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a camera shake correction lens support structure that can accurately detect the position of the correction lens.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a correction lens for correcting image blur, support means for movably supporting the correction lens in a plane orthogonal to the optical axis, and image blur for detecting camera shake. A detection unit, a calculation unit that calculates a correction movement amount to be applied to the correction lens based on information from the image blur detection unit, and the correction lens is moved in a direction to correct image blur based on the information from the calculation unit Driving means for detecting, a position detecting means for detecting the movement position of the correction lens, and a position corresponding to the correction movement amount calculated by the calculation unit based on the movement position of the correction lens detected by the position detection means. a camera and a control means for feedback controlling said drive means so as correcting lens is located, the driving means is moved integrally parallel to the same direction as the direction of moving the correcting lens Through the rotary members to move the correcting lens, the position detecting means, by the detecting contact needle moving parallel to the direction of said movable member to detect the moving position of the pressing contact by the movable member to the movable member It is characterized by indirectly detecting the movement position of the correction lens.
[0006]
The present invention does not directly detect the position of the correction lens, but indirectly detects the position of the correction lens by detecting the position of the movable member moved together with the correction lens by the operation of the driving means. I tried to do it. Thus, the present invention accurately detects the position of the correction lens because the detection contact of the position detection means does not shift or slide with respect to the movable member no matter which direction the correction lens is moved. be able to.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a support structure for a camera shake correction lens according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a front view showing a support structure of an image stabilization lens for a camera according to an embodiment of the present invention. As shown in the figure, a correction lens 12 is held by a lens frame 14 in a lens barrel 10 of a camera lens. The correction lens 12 is moved by the linear motors 16 and 18 in a direction for correcting image blur in a plane orthogonal to the photographing optical axis L. The correction lens 12 is movably supported by the lens barrel 10 via a parallel link mechanism including four arms 20 and 22.
[0008]
The linear motor 16 moves the correction lens 12 in the left-right direction in the figure, and includes a motor body 16A and a rod 16B. The motor body 16 </ b> A is fixed to the lens barrel 10, and the tip of the rod 16 </ b> B is engaged with a long hole 24 of the lens frame body 14 via a roller 26. The long hole 24 is formed on the left side of the lens frame 14 in the vertical direction in the figure, so that the long hole 24 and the roller 26 are relatively movably engaged in the vertical direction in the figure.
[0009]
When the rod 16B is expanded and contracted by the driving force of the motor main body 16A, the lens frame body 14 is pushed by the rod 16B or pulled by the rod 16B as shown in FIG. Further, when a vertical force in the figure is applied to the lens frame 14, the long hole 24 is guided by the roller 26, and the correction lens 12 moves in the vertical direction in the figure.
In FIG. 1, a connecting frame (movable member) 28 is fixed to the rod 16 </ b> B of the linear motor 16. The connecting frame 28 is arranged in the vertical direction in FIG. 1, the rod 16B is fixed to the center, and the upper and lower ends are slidably supported by the linear guides 30 and 30, respectively. The linear guides 30 and 30 are provided in parallel with the rod 16B, so that when the rod 16B is expanded and contracted, the connecting frame 28 translates left and right while maintaining its posture.
[0010]
By the way, the tip of the detection contact needle 32B of the position sensor 32 is pressed against the connection frame 28. The position sensor 32 has a sensor body 32A fixed to the lens barrel 10 at a position where the detection contact needle 32B is parallel to the rod 16B, and the amount of movement of the connecting frame 28 that moves in parallel by the expansion and contraction of the rod 16B. Detect.
The position sensor 32 according to the present embodiment does not directly contact the detection contact needle 32 </ b> B with the peripheral surface of the lens frame 14, but the connection frame 28 that can indirectly detect the movement amount of the correction lens 12. It is in contact. As described above, since the connecting frame 28 moves in parallel while maintaining its posture regardless of the amount of expansion and contraction of the rod 16B, the detection contact needle 32B does not slip or slide from the connecting frame 28 during the movement.
[0011]
Reference numeral 34 </ b> A is a bobbin constituting the speed generator 34, and reference numeral 34 </ b> B is a core constituting the speed generator 34. The core 34 </ b> B is fixed to the connecting frame 28.
On the other hand, the linear motor 18 moves the correction lens 12 in the vertical direction in the figure, and includes a motor body 18A and a rod 18B. The motor body 18 </ b> A is fixed to the lens barrel 10, and the tip of the rod 18 </ b> B is engaged with a long hole 36 of the lens frame body 14 via a roller 38. The long hole 36 is formed in the left-right direction in the figure at the lower part of the lens frame 14, and the long hole 36 and the roller 38 are relatively movably engaged in the left-right direction in the figure.
[0012]
When the rod 18B expands and contracts by the driving force of the motor main body 18A, the lens frame body 14 is pushed by the rod 18B or pulled by the rod 18B as shown in FIG. When a force in the left-right direction in the figure is applied to the lens frame 14, the elongated hole 36 is guided by the roller 38, and the correction lens 12 moves in the left-right direction in the figure.
In FIG. 1, a connecting frame (movable member) 40 is fixed to the rod 18 </ b> B of the linear motor 18. The connecting frame 40 is disposed in the left-right direction in FIG. 1, the rod 18B is fixed to the center, and the left and right ends are slidably supported by the linear guides 42, 42, respectively. The linear guides 42 and 42 are provided in parallel with the rod 18B, so that when the rod 18B is expanded and contracted, the connecting frame 40 translates up and down while maintaining its posture.
[0013]
A tip of a contact needle 44B for detection of the position sensor 44 is pressed against the connection frame 40. The position sensor 44 detects the amount of movement of the connecting frame 40 in which the sensor main body 44A is fixed to the lens barrel 10 at a position where the detection contact needle 44B is parallel to the rod 18B and moves in parallel by the expansion and contraction of the rod 18B.
Similarly to the position sensor 32, the position sensor 44 does not directly contact the detection contact needle 44 </ b> B with the peripheral surface of the lens frame 14, but can detect the movement amount of the correction lens 12 indirectly. 40. Since the connecting frame 40 moves in parallel while maintaining its posture regardless of the amount of expansion / contraction of the rod 18B, the detection contact needle 32B does not slip or slide from the connecting frame 40 during the movement.
[0014]
Reference numeral 46 </ b> A is a bobbin constituting the speed generator 46, and reference numeral 46 </ b> B is a core constituting the speed generator 46, and the core 46 </ b> B is fixed to the connecting frame 40.
FIG. 4 is a block diagram showing a drive control system of the correction lens support structure of the present embodiment. The angular velocity sensor shown in the figure is provided at two locations on the lens barrel 10, one angular velocity sensor 48 is provided on the side of the lens barrel 10, and the other angular velocity sensor 50 is provided on the upper portion of the lens barrel.
[0015]
The angular velocity sensor 48 detects the vibration of the left-right direction component among the vibrations transmitted to the lens barrel 10, and the detected information is output to the CPU 52. The CPU 52 calculates the correction movement amount in the left-right direction to be given to the correction lens 12 based on the information from the angular velocity sensor 48. The signal indicating the correction movement amount in the left-right direction is amplified by the amplifier 54 and then output to the linear motor 16 (see FIG. 2). The linear motor 16 extends or contracts the rod 16B by an amount corresponding to the signal from the CPU 52.
[0016]
On the other hand, the angular velocity sensor 50 detects the vibration of the vertical component of the vibration transmitted to the lens barrel 10, and the detected information is output to the CPU 52. The CPU 52 calculates the vertical correction movement amount to be given to the correction lens 12 based on the information from the angular velocity sensor 50, and sends a signal indicating the vertical correction movement amount to the linear motor 18 (FIG. 3) via the amplifier 54. Output). The linear motor 18 extends or contracts the rod 18B by an amount corresponding to a signal from the CPU 52.
[0017]
Next, the operation of the support structure for the camera shake correction lens having the above-described configuration will be described.
When the camera shake is detected by the angular velocity sensors 48 and 50, the linear motors 16 and 18 are operated based on the information, and the correction lens 12 corrects the image blur within the plane orthogonal to the photographing optical axis L. Moving.
[0018]
For example, when left and right vibration information is output from the angular velocity sensor 48 to the CPU 52, the CPU 52 calculates a correction movement amount in the left and right direction to be applied to the correction lens 12, and a signal indicating the correction movement amount in the left and right direction is used as a linear motor. 16 is output. The linear motor 16 extends or contracts the rod 16B by an amount corresponding to the signal from the CPU 52, and moves the correction lens 12 to a position where image blur is corrected. Thereby, the vibration component in the left-right direction is canceled by the movement of the correction lens 12, and the image blur in the left-right direction is corrected.
[0019]
When the correction lens 12 moves in the left-right direction, the position sensor 32 detects the movement position of the connection frame 28. The position signal detected by the position sensor 32 is compared with a signal indicating the correction movement amount output from the CPU 52, and the CPU 52 causes the linear motor 16 to position the correction lens 12 at a position corresponding to the correction movement amount. Feedback controlled.
[0020]
At this time, the position sensor 32 does not directly detect the position of the correction lens 12 but indirectly detects the position of the correction lens 12 by detecting the position of the connecting frame 28. In any direction, the detection contact needle 32B of the position sensor 32 does not shift or slide with respect to the connecting frame 32. Therefore, the position of the correction lens 12 can be accurately detected.
[0021]
On the other hand, when the vibration information in the vertical direction is output from the angular velocity sensor 50 to the CPU 52, the CPU 52 calculates a correction movement amount in the vertical direction to be applied to the correction lens 12, and a signal indicating the correction movement amount in the vertical direction is used as a linear motor. 18 is output. The linear motor 18 extends or contracts the rod 18B by an amount corresponding to the signal from the CPU 52, and moves the correction lens 12 to a position where image blur is corrected. Thereby, the vibration component in the vertical direction is canceled by the movement of the correction lens 12, and the image blur in the vertical direction is corrected.
[0022]
When the correction lens 12 moves in the vertical direction, the position sensor 44 detects the movement position of the connection frame 40. The detected position signal is compared with the signal indicating the correction movement amount output from the CPU 52, and the linear motor 18 performs feedback control by the CPU 52 so as to position the correction lens 12 at a position corresponding to the correction movement amount. Has been.
[0023]
At this time, the position sensor 44 does not directly detect the position of the correction lens 12 like the position sensor 32 but indirectly detects the position of the correction lens 12 by detecting the position of the connecting frame 40. Therefore, the detection contact needle 44B of the position sensor 44 does not shift or slide with respect to the connection frame 40 no matter which direction the correction lens 12 moves. Therefore, the position of the correction lens 12 can be accurately detected.
[0024]
【The invention's effect】
As described above, according to the camera shake correction lens support structure of the present invention, the position of the correction lens can be determined by detecting the position of the movable member that is moved by the operation of the drive means. Since the detection is indirectly performed, the position of the correction lens can be accurately detected.
[Brief description of the drawings]
FIG. 1 is a front view to which a support structure for a camera shake correction lens according to the present invention is applied. FIG. 2 is an explanatory diagram showing an outline of an operation when the correction lens moves in the left-right direction. FIG. 4 is an explanatory diagram showing an outline of an operation when the lens moves in the vertical direction. FIG. 4 is a block diagram showing a movement control system of the correction lens shown in FIG.
DESCRIPTION OF SYMBOLS 10 ... Lens barrel 12 ... Correction lens 14 ... Lens frame 16, 18 ... Linear motor 28, 40 ... Connection frame 32, 44 ... Position sensor 34, 46 ... Speed generator 48, 50 ... Angular velocity sensor 52 ... CPU

Claims (2)

Information from a correction lens that corrects image blur, a support unit that supports the correction lens movably in a plane orthogonal to the optical axis, an image blur detection unit that detects camera shake, and information from the image blur detection unit A calculation unit that calculates a correction movement amount to be given to the correction lens based on the driving unit, a driving unit that moves the correction lens in a direction to correct image blur based on information from the calculation unit, and a movement position of the correction lens. Feedback control of the drive means so that the correction lens is positioned at a position corresponding to the correction movement amount calculated by the calculation unit based on the position detection means to detect and the movement position of the correction lens detected by the position detection means And a camera having control means for
The drive means moves the correction lens via a movable member that integrally translates in the same direction as the direction in which the correction lens is moved, and the position detection means detects the position parallel to the movement direction of the movable member. A structure for supporting a correction lens for anti-vibration of a camera, wherein the moving position of the correction lens is indirectly detected by detecting the movement position of the movable member by pressing the contact needle against the movable member. The movable member is constituted by a connecting frame that is fixed to the rod of the motor that is the driving means and that moves in parallel along the guide when the rod is expanded and contracted. 2. The camera shake correction lens support structure according to claim 1, wherein the movement position of the correction lens is detected by detecting the movement position.

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