JP2004163648A - Locking mechanism for vibration-proof lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking mechanism for vibration-proof lens capable of restricting movement of a vibration-proof lens without tilting a lens holding frame of the vibration-proof lens to an optical axis of photography by a locking mechanism having a simple structure comprising a lock pin and a support pin. <P>SOLUTION: When the vibration-proof lens 12 is locked, an eccentric pin 58 is retracted from a left-side wall surface 63 of a cut part 62 of the lock pin 44 by rotating an operation knob 60 and then the lock pin 44 is moved to the right with the energizing force of a spring 54, so that the lock pin 44 is engaged with a hole part 42. Consequently, the movement of the vibration-proof lens 12 is restricted by the lock pin 44. At this time, a receiving plate 48 on the other flank 14B of the lens holding frame 14 is made to abut against the support pin 46, so that even when the engaging force of the lock pin 44 is exerted on the lens holding frame 14, the lens holding frame 14 does not slant to the optical axis L. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lock mechanism of an anti-vibration lens, and more particularly to a lock mechanism for temporarily fixing an anti-vibration lens for correcting image blur caused by vibration applied to a camera to a lens barrel.
[0002]
[Prior art]
Conventionally, a lens device equipped with this type of anti-vibration lens supports the anti-vibration lens movably in a plane perpendicular to the photographing optical axis in the lens barrel of the lens device, and when vibration is applied to the lens device or the camera. The image blur is corrected by moving the anti-vibration lens by an actuator in a direction to cancel the vibration.
[0003]
By the way, such a lens device is provided so that the anti-vibration lens does not move and is damaged in the lens barrel when the lens device is transported, and when the anti-vibration function is hardly needed because there is almost no vibration. A lock mechanism for restricting the movement of the vibration lens is provided.
[0004]
As a conventional lock mechanism for a vibration-proof lens, a ring-shaped lock member is arranged around a lens holding frame of the vibration-proof lens, and the lock member is pressed against the outer peripheral surface of the lens holding frame, thereby forming the vibration-proof lens. A device configured to restrict movement is known (for example, Patent Document 1).
[0005]
However, this locking mechanism has a disadvantage that a ring-shaped locking member having a diameter larger than that of the lens holding frame must be disposed in the lens barrel, and the lens barrel has a correspondingly large diameter and is thus enlarged.
[0006]
Therefore, a lock mechanism has been proposed in which a hole is formed in the lens holding frame of the image stabilizing lens, and a lock pin is fitted into the hole to fix the image stabilizing lens to the lens barrel via the lock pin. ing. According to this lock mechanism, since the structure is such that the lock pin is merely fitted into the hole of the lens holding frame, there is an advantage that the lens barrel is smaller than the lock mechanism using the ring-shaped lock member.
[0007]
[Patent Document 1]
JP 2000-2901 A (page 3 FIG. 2)
[0008]
[Problems to be solved by the invention]
However, the lock mechanism of the conventional anti-vibration lens using the lock pin is configured such that when the lock pin is fitted into the hole of the lens holding frame, the lens is biased by a spring that biases the lock pin in the fitting direction. There is a drawback that the holding frame falls down and the optical axis of the anti-vibration lens shifts with respect to the optical axis of the entire optical system.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has a simple structure in which the movement of the anti-vibration lens can be restricted without tilting the lens holding frame of the anti-vibration lens with respect to the optical axis. It is an object to provide a locking mechanism.
[0010]
[Means for Solving the Problems]
The present invention provides a lock mechanism of a vibration-proof lens that corrects image blur caused by vibration applied to a camera by being moved in a plane orthogonal to an optical axis in a lens barrel to achieve the above object. The lock mechanism is provided with a concave portion formed on one side surface orthogonal to the optical axis of a lens holding frame that holds the image stabilizing lens, and is attached to the lens barrel, and is provided to be movable forward and backward with respect to the concave portion, A lock member that fits into the concave portion by being moved forward and regulates the movement of the lens holding frame, and is attached to the lens barrel and abuts on the other side surface orthogonal to the optical axis of the lens holding frame. A contact member for supporting the lens holding frame.
[0011]
According to the first aspect of the present invention, the movement of the lens holding frame is regulated by fitting the lock member into the concave portion formed on one side surface orthogonal to the optical axis of the lens holding frame. At this time, the other side surface orthogonal to the optical axis of the lens holding frame is supported by the abutting member, so that even if the fitting force of the lock member (the pressing force against the concave portion) acts on the lens holding frame, Does not fall. Therefore, the movement of the anti-vibration lens can be restricted without tilting the lens holding frame of the anti-vibration lens with respect to the optical axis by the lock mechanism having a simple structure including the lock member and the contact member.
[0012]
According to the invention described in claim 2, the lock member and the contact member are arranged on the same line parallel to the optical axis. With this arrangement, the contact member directly receives the fitting force of the lock member via the lens holding frame, so that stress that causes the lens holding frame to twist is not generated in the lens holding frame. Accordingly, it is possible to prevent the occurrence of a shift of the optical axis due to the deformation of the lens holding frame due to the stress.
[0013]
According to the third aspect of the present invention, the fitting surface of the concave portion and the lock member formed in the lens holding frame is formed as tapered surfaces, and the tapered surface of the lock member is pressed against the tapered surface of the concave portion. Since the lens holding frame is guided by the tapered surface of the lock member to align the optical axis of the anti-vibration lens with the optical axis of the entire optical system, it is particularly advantageous when the movement of the anti-vibration lens is restricted and used for photographing. Become.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a lock mechanism of an anti-vibration lens according to the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIG. 1 is a sectional view of a main part of a lens barrel to which a lock mechanism of an anti-vibration lens according to an embodiment of the present invention is applied, and FIG. 2 is a front view showing a moving mechanism of the anti-vibration lens. As shown in FIG. 2, an anti-vibration lens 12 is disposed in a lens barrel 10 of a camera lens device while being held by a rectangular lens holding frame 14. The anti-vibration lens 12 is moved by linear motors 16 and 18 constituting the moving mechanism in a direction perpendicular to a photographing optical axis (optical axis of the entire optical system) L in a direction in which image blur is corrected.
[0016]
That is, in the lens holding frame 14 of the anti-vibration lens 12, a pair of bearing portions 20, 20 formed on the right edge in FIG. 2 are slidably fitted to guide bars 21 arranged vertically. Is moved up and down. In addition, the lens holding frame 14 is configured such that a pair of bearing portions 22 formed on the lower edge portion in FIG. 2 is slidably fitted to a guide bar 23 disposed in the left-right direction. Moved to With this structure, the lens holding frame 14 is movable in a plane orthogonal to the photographing optical axis L.
[0017]
The linear motor 16 is an actuator that moves the image stabilizing lens 12 in the left-right direction in FIG. 2, and includes a motor body 16A and a piston 16B. The motor body 16A is fixed to the lens barrel 10, and the tip of the piston 16B is connected to a substantially inverted U-shaped frame 24 to which both ends of the guide bar 21 are fixed. The frame 24 is movable in the left-right direction by slidably fitting bearing portions 25, 25 formed at its upper and lower ends with guide bars 26, 26 arranged in the left-right direction in FIG. Has become. The guide bars 26 are fixed to the lens barrel 10.
[0018]
Further, the tip of the contact needle 28B for detection of the position sensor 28 is pressed against the frame 24. The position sensor 28 is configured such that the sensor body 28A is fixed to the lens barrel 10 at a position where the detection contact needle 28B is parallel to the piston 16B, and the amount of lateral movement of the frame 24 that is translated in the lateral direction by the expansion and contraction of the piston 16B. Is detected.
[0019]
On the other hand, the linear motor 18 is an actuator that moves the image stabilizing lens 12 in the vertical direction in FIG. 2, and includes a motor body 18A and a piston 18B. The motor body 18A is fixed to the lens barrel 10, and the tip of the piston 18B is connected to a substantially concave frame 30 to which both ends of the guide bar 23 are fixed. The frame 30 is vertically movable by slidingly fitting bearing portions 31, 31 formed on the left and right ends thereof with guide bars 32, 32 arranged vertically in FIG. Are located. The guide bars 32 are fixed to the lens barrel 10.
[0020]
Further, the tip of the contact needle 34B for detection of the position sensor 34 is pressed against the frame 30. The position sensor 34 is configured such that the sensor body 34A is fixed to the lens barrel 10 at a position where the detection contact needle 34B is parallel to the piston 18B, and the vertical movement amount of the frame 30 that moves in the vertical direction by the expansion and contraction operation of the piston 18B. Is detected.
[0021]
The lens barrel 10 is provided with two angular velocity sensors (not shown). One angular velocity sensor is provided on the side of the lens barrel 10 and the other angular velocity sensor is provided on the upper part of the lens barrel. The former angular velocity sensor detects left and right component vibrations among the vibrations transmitted to the lens barrel 10, and the detected information is output to a CPU (not shown). The CPU calculates the amount of correction movement in the left-right direction to be given to the anti-vibration lens 12 based on information from the angular velocity sensor. The signal indicating the amount of correction movement in the left-right direction is output to the linear motor 16 after being amplified by the amplifier. The linear motor 16 extends or contracts the piston 16B by an amount corresponding to the signal from the CPU. When the piston 16B is extended or contracted, the lens holding frame 14 is guided by the guide bar 23 and moves in the left-right direction in FIG.
[0022]
On the other hand, the latter angular velocity sensor detects a vertical component of the vibration transmitted to the lens barrel 10, and the detected information is output to the CPU. The CPU calculates a vertical movement amount to be given to the image stabilizing lens 12 based on information from the angular velocity sensor, and outputs a signal indicating the vertical movement amount to the linear motor 18 via the amplifier. . The linear motor 18 extends or contracts the piston 18B by an amount corresponding to a signal from the CPU. When the piston 18B is extended or contracted, the lens holding frame 14 is guided by the guide bar 21 and is moved up and down in FIG.
[0023]
The image blur caused by the vibration applied to the camera is corrected by the anti-vibration lens 12 due to the lateral movement and the vertical movement of the lens holding frame 14.
[0024]
As shown in FIGS. 1 and 3, the lock mechanism 40 of the anti-vibration lens 12 of the embodiment includes a hole (recess) 42, a lock pin (lock member) 44 formed in the lens holding frame 14 of the anti-vibration lens 12, and It is composed of a support pin (contact member) 46 and the like.
[0025]
The hole 42 is formed at the upper left corner of one side surface 14A of the lens holding frame 14 shown in FIG. 3, and the outer peripheral surface thereof is formed as a tapered tapered surface 43. The hole 42 is closed by a plastic receiving plate 48 attached to the other side surface 14B of the lens holding frame 14 as shown in FIG. 4, and the optical axis L 'of the anti-vibration lens 12 as shown in FIG. It is formed around a parallel axis P.
[0026]
The lock pin 44 is formed in a cylindrical shape, and its through hole 49 is slidably fitted to a guide pin 50 provided in parallel with the photographing optical axis L. The guide pins 50 protrude from a support plate 52 formed on the inner periphery of the lens barrel 10 as shown in FIG.
[0027]
A spring 54 is arranged between the support plate 52 and the lock pin 44. By the urging force of the spring 54, the lock pin 44 is urged in the fitting direction with the hole 42, and the tip tapered surface 45 of the lock pin 44 is fitted into the tapered surface 43 of the hole 42 as shown in FIG. . As a result, the lens holding frame 14 is locked to the lens barrel 10 via the lock pin 44, and the movement of the anti-vibration lens 12 is restricted.
[0028]
As shown in FIG. 1, the lens barrel 10 is provided with an operation unit 56 for retracting the lock pin 44 from the hole 42 against the urging force of the spring 54.
[0029]
The operation unit 56 includes an eccentric pin 58 and an operation knob 60 as shown in FIG. The eccentric pin 58 is inserted into a notch 62 formed on the surface of the lock pin 44, and is connected to a connection bar 66 of the operation knob 60 via a connection plate 64. When the operation knob 60 is rotated to position the eccentric pin 58 at the position shown in FIG. 4, the eccentric pin 58 presses the left wall 63 of the notch 62 of the lock pin 44 to the left, thereby causing the lock pin 44 to move. Is moved to the left against the urging force of the spring 54, and the lock pin 44 is retracted from the hole 42. Thereby, the regulation by the lock pin 44 is released, and the image stabilizing lens 12 can be moved. When the operation knob 60 is rotated to position the eccentric pin 58 at the position shown in FIG. 5, the eccentric pin 58 is retracted rightward from the left wall surface 63 of the cutout portion 62 of the lock pin 44 to lock the eccentric pin 58. The pin 44 is moved rightward by the urging force of the spring 54, and the lock pin 44 fits into the hole 42. As a result, the movement of the anti-vibration lens 12 is restricted by the lock pin 44.
[0030]
Further, the tapered surface 43 of the concave portion 42 and the tapered surface 45 of the lock pin 44 press the tapered surface 45 against the tapered surface 43 so that the lens holding frame 14 is guided by the tapered surface 45 and the light of the vibration-proof lens 12 is The axis L 'is formed at an inclination angle that is automatically adjusted to the photographing optical axis L.
[0031]
On the other hand, as shown in FIGS. 4 and 5, the support pin 46 is disposed on the opposite side of the lock pin 44 with the lens holding frame 14 interposed therebetween, and is attached to the other side surface 14B of the hole 42 of the lens holding frame 14. In contact with the receiving plate 48. The support pin 46 is provided so as to project from a support plate 68 formed on the inner peripheral surface of the lens barrel 10 and is arranged on the same axis as the lock pin 44. The surface of the receiving plate 48 on the support pin 46 side is coated with a lubricant so as to reduce the sliding resistance due to the contact of the support pin 46.
[0032]
Next, the operation of the lock mechanism 40 of the anti-vibration lens 12 configured as described above will be described.
[0033]
When restricting the movement of the anti-vibration lens 12 in the movable state shown in FIG. 4, when the operation knob 60 (see FIG. 3) is turned, for example, 180 ° from the position in FIG. 4, the eccentric pin 58 is locked. By retracting from the left wall surface 63 of the cutout 62 of the pin 44, the lock pin 44 moves rightward by the urging force of the spring 54, and the lock pin 44 fits into the hole 42 as shown in FIG. As a result, the movement of the anti-vibration lens 12 is restricted by the lock pin 44.
[0034]
At this time, since the receiving plate 48 on the other side surface 14B of the lens holding frame 14 is supported in contact with the support pin 46, the fitting force of the lock pin 44 (the pressing force against the hole 42) is applied to the lens holding frame 14. Even if it acts, the lens holding frame 14 does not fall with respect to the optical axis L.
[0035]
Therefore, according to the lock mechanism 40 of the embodiment, the lens holding frame 14 of the anti-vibration lens 12 is not tilted with respect to the photographing optical axis L by the lock mechanism having a simple structure including the lock pin 44 and the support pin 46. The movement of the anti-vibration lens 12 can be restricted.
[0036]
Further, according to the lock mechanism 40, the lock pin 44 and the support pin 46 are arranged on the same axis. With this arrangement, since the support pin 46 directly receives the fitting force of the lock pin 44 via the lens holding frame 14, no stress that causes the lens holding frame 14 to twist is generated in the lens holding frame 14. Accordingly, it is possible to prevent the optical axis L 'from being shifted due to the deformation of the lens holding frame 14 due to the stress.
[0037]
Further, according to the lock mechanism 40, the lens holding frame 14 can be guided by the tapered surface 45 of the lock pin 44 and the optical axis L ′ of the anti-vibration lens 12 can be aligned with the photographing optical axis L. This is particularly advantageous when the camera is used for photographing by restricting the movement of the camera.
[0038]
In the lock mechanism 40 shown in FIGS. 4 and 5, an example in which the hole 42 is closed by the receiving plate 48 and the support pin 46 protrudes from the support plate 68 has been described, but as shown in FIGS. 6 and 7. Instead of a through hole, a concave portion 42 'may be formed in the lens holding frame 14, and the tapered surface 45 of the lock pin 44 may be fitted into the tapered surface 43' of the concave portion 42 '. Further, a convex contact member 69 may be integrally formed on the support plate 68, and the contact member 69 may contact the other side surface 14 </ b> B of the lens holding frame 14. Also in this case, a part of the other side surface 14B with which the contact member 69 contacts is coated with a lubricant, and the lock pin 44 and the contact member 69 are arranged on the same straight line.
[0039]
【The invention's effect】
As described above, according to the anti-vibration lens locking mechanism of the present invention, the locking member is fitted into the concave portion formed on one side surface orthogonal to the optical axis of the lens holding frame, and the movement of the lens holding frame is performed. When regulated, the other side surface of the lens holding frame orthogonal to the optical axis is supported by the contact member, so that the lens holding frame does not fall. Therefore, the movement of the anti-vibration lens can be restricted without tilting the lens holding frame of the anti-vibration lens with respect to the optical axis by a lock mechanism having a simple structure including the lock member and the contact member.
[0040]
Further, according to the present invention, since the lock member and the contact member are arranged on the same line parallel to the optical axis, it is possible to prevent the deformation of the lens holding frame when the movement of the anti-vibration lens is restricted by the lock member, Thereby, it is possible to prevent the optical axis from being shifted due to the deformation.
[0041]
Further, according to the present invention, the fitting surface between the concave portion formed in the lens holding frame and the lock member is formed as a tapered surface, and the tapered surface of the lock member is pressed against the tapered surface of the concave portion. Since the lens holding frame is guided by the tapered surface and the optical axis of the image stabilizing lens is aligned with the optical axis of the entire optical system, it is particularly advantageous when the movement of the image stabilizing lens is restricted and used for photographing.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a main part of a lens barrel to which a lock mechanism of an anti-vibration lens according to the present invention is applied. FIG. 2 is a front view showing an embodiment of a moving mechanism of the anti-vibration lens. FIG. 4 is a perspective view showing an embodiment of a lens lock mechanism. FIG. 4 is an operation explanatory view of the lock mechanism shown in FIG. 3. FIG. 5 is an operational explanatory view of the lock mechanism shown in FIG. FIG. 7 is an essential part cross-sectional view showing an embodiment of another lock mechanism. FIG. 7 is an operation explanatory view showing a state in which the lock mechanism shown in FIG. 6 restricts the movement of the anti-vibration lens.
Reference Signs List 10: lens barrel, 12: anti-vibration lens, 14: lens holding frame, 16, 18: linear motor, 28, 34: position sensor, 40: locking mechanism, 42: hole (recess), 44: lock pin (lock) ), 46 ... support pin (contact member), 48 ... receiving plate, 50 ... guide pin, 54 ... spring, 56 ... operation part, 58 ... eccentric pin

Claims (3)

In a lock mechanism of an anti-vibration lens that corrects image blur caused by vibration applied to a camera by being moved in a plane orthogonal to an optical axis in a lens barrel,
The lock mechanism includes:
A concave portion formed on one side surface orthogonal to the optical axis of the lens holding frame that holds the anti-vibration lens,
A lock member attached to the lens barrel and provided to be movable forward and backward with respect to the concave portion, fitted into the concave portion by being advanced and moved, and restricting movement of the lens holding frame;
A contact member attached to the lens barrel and abutting on the other side surface orthogonal to the optical axis of the lens holding frame to support the lens holding frame;
A lock mechanism for an anti-vibration lens, comprising: The locking mechanism according to claim 1, wherein the lock member and the contact member are arranged on the same line parallel to the optical axis. The fitting surfaces of the concave portion and the lock member formed in the lens holding frame are formed as tapered surfaces, and the tapered surface of the lock member is pressed against the tapered surface of the concave portion to form the tapered surface of the lock member. 3. The locking mechanism of the anti-vibration lens according to claim 1, wherein the lens holding frame is guided by the guide so that the optical axis of the anti-vibration lens is aligned with the optical axis of the entire optical system.

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