JPH0887045A - Image stabilizer - Google Patents

Abstract

(57) [Abstract] [Purpose] When the power supply is suddenly cut off and the drive means becomes inoperable, the correction optical means is placed in a safe and immovable state without using electric power. A manual locking means for bringing the correction optical system L2 into the immovable state regardless of the states of the driving means 85 and 99 for transitioning the correction optical system L2 between the movable state and the immovable state. By providing 20 and 82 and operating them externally, it is possible to position the correction optical system in an immovable state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Industrial field: A correction optical system for correcting image shake caused by shake applied to the apparatus transits between a movable state (unlocked state) and an immovable state (locked state). The present invention relates to an improvement of an image blur correction device including a driving unit for the purpose.

[0002]

2. Description of the Related Art The prior art to which the present invention is applied will be described below by taking a camera as an example.

[0003] Modern cameras are becoming more automated, and it is extremely unlikely that even an inexperienced person will make a shooting failure, but it is difficult to automatically prevent only a shooting failure due to camera shake. It was

Therefore, in recent years, research and development have been enthusiastically carried out on a camera for the purpose of preventing photographing failure due to camera shake of the photographer.

As a method for suppressing the camera shake of the photographer,
There is a method of detecting a vibration caused by camera shake and displacing a correction lens according to the detected value to correct an optical change of an image. More specifically, shake vibration is detected by a vibration sensor such as an accelerometer or an angular velocity meter, and the angular velocity is detected electrically or mechanically from the sensor signal. Based on this detection information, part or all of the photographing optical system is detected. It was configured to displace a correction optical system in a direction different from the optical axis, such as decentering parallel to the direction perpendicular to the optical axis or tilting the optical axis.

When the correction optical system is driven parallelly and eccentrically in the direction perpendicular to the optical axis as a driving method, the fixed portion of the image pickup apparatus can be freely moved in one direction (eg, vertical direction) perpendicular to the optical axis. By holding the connecting member to the fixing member and holding the correction lens frame to which the correction lens is fixed, freely moving in another direction (eg, left-right direction) perpendicular to the optical axis with respect to the connecting member, It is possible to move the correction optical system in any direction perpendicular to the optical axis.

Further, as an actuator for driving the correction lens, the correction lens frame is provided with a device perpendicular to the optical axis.
By attaching two electromagnetic coils corresponding to one direction and mounting a pair of yokes and permanent magnets corresponding to the two coils on the fixed part, a moving coil system that can independently control two directional components It constitutes an actuator.

Furthermore, the position of the correction lens is detected and the position information is fed back to realize highly accurate drive control of the correction lens.

As described above, the shake correction using the correction optical system has been described. However, after the photographing is finished,
It is necessary to hold the correction optical system at a predetermined position. In particular,
By turning off the power like the moving coil method,
If the correction optical system moves in any direction due to its own weight, a special locking mechanism is required. Also,
Considering shooting without shake correction, it is desirable to hold the optical axis of the correction optical system and the optical axis of the entire shooting optical system at the position where they coincide with each other in terms of the position with the best optical performance.

As a conventional example of the lock mechanism configured for such a purpose, 1) a lock member for holding the correction optical system at a neutral position is provided, and a spring biases the lock member in a direction to lock the lock member. I'll do it. During the shake correction, the solenoid retracts the lock member from the lock position against the biasing force of the spring to keep the correction lens movable. At the end of the shake correction, the solenoid is de-energized to drive the lock member to the lock position by the urging force of the spring, and the correction optical system is held at the neutral position again.

2) The lock member for holding the correction optical system at the neutral position is retracted from the lock position by the motor, so that the shake can be corrected, and the motor is reversely rotated (or further rotated) to be locked. Drive the member to the locked position.

3) A similar lock member is urged in a direction to be locked by a spring, and at the time of shake correction, the lock member is locked by a hook while the lock member is retracted from the lock position by the motor, and the correction optical system is used. Keep moving. After the shake correction is completed, the motor is slightly rotated in the reverse direction to unlock the hook, and the spring drives the lock member to the lock position.

In this case, even if the power supply is suddenly turned off during shake correction, the backup power supply can be used to lock the motor only slightly in the reverse direction.

4) When a bistable plunger is provided and the shake correction is not performed, the correction lens is driven to a neutral position by a normal shake correction actuator, and in that state, the correction lens is provided on the fixed portion by the plunger. The projection is fitted into a hole provided in the correction lens frame to lock the correction lens.

[0015]

However, the above-mentioned conventional example has the following problems.

In the conventional example of the above 1), the lock member is driven by the solenoid to a state where the shake can be corrected, and further,
Since the state in which shake correction is possible is always maintained during shake correction, the solenoid requires enormous power consumption, and in order to reduce power consumption, the shake correction range (correction angle) must be narrowed.

In the conventional examples of the above 2) and 4), when the power is suddenly turned off during shake correction, the correction optical system cannot be locked (in order to lock the correction optical system again, the power is not supplied). Therefore, there is a serious problem that the correction optical system which is not locked becomes unstable due to the movement of the apparatus, and in the worst case, even the apparatus may be damaged.

In the conventional example of the above 3), the correction optical system can be locked even when the power source suddenly disappears, but the condenser as the backup power source is particularly arranged in the camera or the lens barrel. Is large in shape and hinders downsizing of the device.

(Object of the Invention) A first object of the present invention is to prevent the correction optical means from being safely moved without using electric power when the power supply is suddenly cut off and the driving means becomes inoperable. An object of the present invention is to provide an image blur correction device that can be placed in a state.

A second object of the present invention is to provide an image blur correction device which can achieve the first object by a simple mechanism, and can realize the downsizing and cost reduction of the device. is there.

[0021]

In order to achieve the above first object, the present invention is concerned with the state of a driving means for making a transition between a movable state and a non-movable state of a correction optical system. First, a manual lock means is provided for making the correction optical system immovable, and the correction optical system can be positioned in the immovable state by an external operation.

In order to achieve the above-mentioned second object, according to the present invention, the supporting member for moving and holding the correction optical system to a predetermined position and the correction optical system are in a movable state for shake correction. A correction optical system is provided by providing a manual lock means for disconnecting the connection with the moving member that moves the support member up to, and disconnecting the connection between the support member and the moving member, which is a component of the driving means by the manual lock means. Is forcibly (due to the action of the urging member) positioned immovable, that is, in the locked state.

[0023]

The present invention will be described in detail below with reference to the illustrated embodiments.

1 to 7 are views relating to an embodiment of the present invention. FIG. 1 is a sectional view of a zoom lens barrel according to the present invention, and FIG. 2 is incorporated in the lens barrel of FIG. 3 is an exploded perspective view of the shake correction unit, FIG. 3 is a development view of the lock mechanism in a state when the shake correction unit is operating, FIG. 4 is a development view showing a forcibly locked state of the lock mechanism, and FIGS. 5 and 6 are lock rings. FIG. 7 is a plan view showing the operating state of FIG. 7, and FIG. 7 is a configuration diagram showing the entire locking mechanism.

In FIG. 1, reference numeral 1 denotes a fixed cylinder, which has a large diameter portion at the front and a small diameter portion at the rear. Reference numeral 2 denotes a cam barrel which is located outside the fixed barrel 1 and is rotatably held around the optical axis of the lens. The cam groove 2a formed on the rear inner peripheral surface and the protrusion 1a provided on the fixed barrel 1 are engaged with each other. It is held so that it can rotate in a fixed position by connecting with a bayonet so that they fit together.

Reference numeral 3 is a straight-moving cylinder, and keys 3a are fixed to the inner peripheral portion of the rear end at three equal parts by means of step screws 3b. Since the key 3a is simultaneously engaged with the rectilinear groove 1b formed in the fixed barrel 1 and the first group cam groove 2b formed in the cam barrel 2,
When the rectilinear barrel 3 moves in the optical axis direction, the cam barrel 2 rotates.

Note that FIG. 1 shows a wide-angled state, and as the telephoto state is reached, the rectilinear barrel 3 is extended forward.

A male helicoid 3c is formed on the front outer periphery of the rectilinear barrel 3 and engages with a female helicoid 4a formed on the inner periphery of the first group lens barrel 4 to which the first group lens L1 is fixed. ing. That is, by rotating the first group lens barrel 4, the helicoid mechanism moves the first group lens L1 together with the first group lens barrel 4 in the optical axis direction.

In this embodiment, by moving the first group lens barrel 4 in the direction of the optical axis, the first group lens L1 largely moves together with the rectilinear barrel 3 for zooming, and the first group mirror is moved. By rotating the barrel 4, the first group lens L1
Focus adjustment is performed by moving while rotating in the optical axis direction.

This structure is a so-called manual focus one-ring type straight-ahead zoom, and the first group lens barrel 4 is used.
The cam barrel 2 is rotated by the straight movement in the direction of the optical axis to realize the zooming operation.

Reference numeral 5 denotes a shake correction unit, and a roller 51a attached to the shake correction unit main body 51 is a fixed cylinder 1.
It is fixed by engaging with the mounting hole 1c provided in the. L2 is a second lens group, which is not moved in the optical axis direction during zooming, and is held so as to be able to move only in the direction perpendicular to the optical axis with respect to the shake correction unit 5 for shake correction.

Reference numeral 6 denotes a third lens unit barrel, which is a third lens unit L3.
And the known electromagnetic diaphragm unit 7 is fixedly held by screws. The third group lens barrel 6 has three rollers 6a in the circumferential direction. The rollers 6a are formed in a straight groove 1d provided in the fixed barrel 1 and a third group cam groove 2c provided in the cam barrel 2. Engaged at the same time.

Reference numeral 8 denotes a fourth group lens barrel, to which a fourth group lens L4 that does not move due to zooming is fixed, and which is fixed to the small diameter portion of the fixed barrel by screws. A fifth group lens barrel 9 holds the fifth group lens L5, and has three rollers 9a on the outer circumference of the front flange portion.

The roller 9a is simultaneously engaged with the rectilinear groove 1d common to the third lens group L3 provided on the fixed barrel 1 and the fifth group cam groove 2d formed on the cam barrel 2. Therefore, by rotating the cam barrel 2, the first, third, and fifth lens units L1, L3, and L5 are simultaneously moved in the optical axis direction to perform a zooming operation.

Reference numeral 15 denotes an exterior ring, which is fixed to the fixed cylinder 1 at the rear end with screws 15a. Further, the mount 1 for mounting on the camera body (not shown) is attached to the exterior ring 15.
6 is fixed by screws 16a.

Reference numeral 17 denotes a back cover, which is fixed to the mount 16 by utilizing elasticity and has a function of preventing the inside of the lens barrel from being seen and blocking stray light.

Reference numeral 18 denotes a mounting component made of a flexible printed circuit board for driving and controlling the diaphragm unit 7 and the shake correction unit 5 described above.
It is attached to a by a double-sided tape, and is fixed to the outer periphery of the small diameter portion of the fixed cylinder 1 with screws. A connection portion 18b is extended behind the mounting component 18 and is electrically connected to a contact component 19 for communicating with the camera body. The electric power for driving the control unit and the drive for the diaphragm unit 7 and the shake correction unit 5 is also supplied through the contact part 19 and the connecting portion 18b.

Reference numeral 7a is a flexible printed circuit board for electrically connecting the diaphragm unit 7 and the mounting component 18, and the front side is U-shaped.
By arranging the diaphragm unit 7 in a bent shape, a stable electrical connection is made even if the diaphragm unit 7 moves in the optical axis direction due to zooming, and the rear end is the connector 18d in the mounting component 18.
It is connected to the.

Reference numeral 52 is a flexible printed circuit board for electrically connecting the shake correction unit 5 and the mounted parts, and the front end is
It is connected to a driving unit of the second group lens L2 for performing shake correction, a position detecting unit of the second group lens L2, and a lock unit 81 described later, and its rear end is connected to a connector 18e in the mounting component 18. .

Reference numeral 20 denotes a switch for switching whether or not shake correction is performed, which is attached to the exterior ring 15 so as to be operated from the outside. The switch 20 communicates with the control circuit through a connecting portion 18c extended from the mounting component 18. In addition, the switch 20 has an interlocking portion 2
0a is provided, and an interlocking lever 82 that interlocks with a lock unit 81 described later engages with the interlocking portion 20a.

Reference numeral 21 denotes a vibration sensor for detecting camera shake such as camera shake. In this embodiment, a vibration gyro is used to detect the angular velocity. When the lens barrel is attached to the camera body, the vibration sensor 21 detects the rotational shake of the camera in the vertical direction (pitch direction) and the rotational shake of the camera in the lateral direction (yaw direction). And one on each side.

Each vibration sensor is electrically connected to the image stabilization control circuit of the mounting component 18. The output of this sensor is converted into an angular displacement by the image stabilization control circuit, and further focal length information, subject distance information, etc. Is added to convert the eccentricity of the correction lens to be used for drive control.

Reference numeral 81 is a lock unit, and the lock unit 81 has a function of mechanically suppressing the operation of the shake correction unit 5. The structure of the lock unit 81 will be described later.

Next, the structure of the shake correction unit 5 will be described with reference to FIG.

In FIG. 2, 51 is a shake correction unit 5.
This is the unit main body, and the rollers 51a are divided into three equal parts on the outer circumference.
Has been fixed. The roller 51a engages with the mounting hole 1c (see FIG. 1) of the fixed barrel 1 and holds the shake correction unit 5 as a whole.

Reference numeral 53 is a connecting arm, which is supported so as to be movable in the left-right direction (hereinafter referred to as the X direction) with respect to the pin 54a. A pin 54b is fixed to the connecting arm 53 in a vertical direction (hereinafter, referred to as Y direction), and an eccentric frame 55 is held movably in the Y direction with respect to the pin 54b.

Therefore, the pin 54a is connected to the unit main body 5
By fixing the eccentric frame 55 in the first hole 51b, the eccentric frame 55 is held so as to be movable in both the X and Y directions with respect to the unit main body 51.

Further, the eccentric frame 55 is arranged in the optical axis direction (hereinafter, Z
So as not to move in the direction), a projection 55c is provided on the front surface and the rear surface of the eccentric frame 55, and the projection 55c abuts on the front surface of the unit main body 51 and the rear surface of the light shielding plate 62 described later,
The movement in the Z direction is prevented.

The eccentric frame 55 has a voice coil 56a,
56b are adhesively fixed for driving in the X and Y directions, respectively. Further, yokes 58a and 58b to which a magnet 57 is adhered are fixed to the unit body 51 by screws at positions corresponding to the voice coils 56a and 56b.

As a means for detecting the eccentric position of the eccentric frame 55, a pair of IREDs 59a, 59b as light projecting elements together with the slits 60a, 60b are provided in the holes 55a, 5 of the eccentric frame 55.
5b is fitted and fixed, and a pair of PSDs 61a and 61b as light receiving elements are fixed to the unit main body 51.

Reference numeral 62 denotes a light shielding plate, which is fixed to the front end of the unit main body 51 with a screw, and a light shielding line is formed on the front surface. The light-shielding plate 62 has a function of preventing stray light to the PSDs 61a and 61b at the time of detecting the amount of eccentricity of the correction lens at the time of shake correction, and limiting the light flux incident from the front surface of the lens.

Reference numeral 70 is a lock pin for interlocking with the lock unit 81, and four pins are equally arranged behind the eccentric frame 55.

Next, the structure of the lock unit 81 will be described with reference to FIGS.

In each figure, the same parts are designated by the same reference numerals. Further, in FIGS. 3 and 4, in order to clarify the drawings, what is originally drawn linearly is shown in two stages, and each gear is shown in cross section, but hatching is omitted. .

In FIG. 3, reference numeral 83 is a lock base plate, and 84 is a lock ring.

The lock ring 84 is rotatably held by a holding portion 83a provided on the lock base plate 83. Then, the lock portion 8 is attached to the lock ring 84.
4a is provided at a position corresponding to the lock pin 70 described above.

The relative positional relationship between the lock ring 84 and the lock pin 70 is shown in FIGS. 5 and 6 for the locked state and the unlocked state, respectively.

FIG. 5 shows the locked state, and FIG. 6 shows the unlocked state.

In FIG. 5, a lock pin 70 provided on an eccentric frame 55 (not shown) has a structure in which the eccentric frame 55 is connected to the connecting arm 5.
The rotation of the lock ring 84a of the lock ring 84 is prevented because the rotation of the lock ring 84 is prevented by the action of 3 (not shown) and the movable portion can move only in the X and Y directions.
The movement in the X and Y directions is restrained in the state of abutting against.

When the lock ring 84 in FIG. 5 rotates in the direction of arrow B in FIG. 5, the state shown in FIG.
That is, movement of the eccentric frame 55 in the X and Y directions is allowed.
The rotation of the lock ring 84 in the direction of arrow A from the state of FIG. 5 is suppressed by a stopper (not shown).

Referring again to FIG. 3, 85 is a motor,
It is fixed to the lock base plate 83 with screws 86. A pinion gear 87 is press-fitted and coupled to the output shaft 85a of the motor 85. Reference numerals 88 to 95 denote gears, which are gear shafts 83 integrally provided on the lock base plate 83.
It is rotatably held by b, 83c, 83d, 83d ', 83e and 83f.

Reference numeral 96 denotes a sub base plate. The sub base plate 96 is fixed to the lock base plate 83 by screws 97, and the shafts 100 and 101 for holding the gear 98 and the operating gear 99 are fixed. Further, the sub base plate 96 allows the gear 8
Thrust positions 8 to 95 are regulated, and are held so as not to fall off from the gear shafts 83b to 83f.

The gear 98 is rotatably held on the shaft 100, and the operating gear 99 is rotatably held on the shaft 101 and movably in the thrust direction within a predetermined range.

Due to the gear train, the rotation of the motor 85 is
Pinion gear 87 to gears 88, 89, 90, 91, 9
2, 93, 94, 95, 98 are sequentially transmitted, and finally the operating gear 99 is rotated.

Reference numeral 102 denotes a coil spring, one end of which is locked to the hook portion 84b of the lock ring 84 and the other end of which is locked to the hook portion 83g of the lock base plate 83. In addition, the coil spring 102 allows the lock ring 84 to move from FIG.
It is always biased in the direction of arrow A shown in FIG.

The above-mentioned operating gear 99 has an output pin 99a.
Are integrally provided, and the output pin 9 is normally operated.
An end surface 84d of the operating portion 84c shown in FIGS. 5 and 6 provided on the lock ring 84 is constantly in contact with 9a by the force of the coil spring 102.

Therefore, when the motor 85 rotates the operating gear 99 in the direction of arrow C in FIG. 5, the output pin 99a rotates the lock ring 84 in the direction of arrow B in FIG.
The state transitions to that shown in FIG.

Returning to FIG. 3 again, 103 is a switch, which is fixed to the lock base plate 83 by screws 104. The switch 103 is switched by the switching units 84e and 84f provided on the lock ring 84, and the lock ring 84 is in the locked state of FIG.
It is turned on in the unlocked state of and is turned off in the transition state of the intermediate position.

Reference numeral 105 denotes an interlocking clutch, which is held by a holding shaft 83h provided integrally with the lock base plate 83. Reference numeral 106 denotes a holding spring, which is hung between the arm portion 105a of the interlocking clutch 105 and the hook portion 83i integrally provided on the lock base plate 83, and biases the interlocking clutch 105 in the direction of arrow D in FIG. There is.

The interlocking clutch 105 has an interlocking arm 1
05b is provided, and the interlocking arm 105b is in a groove 99b provided in the operating gear 99.

With this structure, the thrust position of the operating gear 99 coincides with the interlocking clutch 105, and the operating gear 99 moves integrally in the directions of arrows D and E in FIG.

The interlocking clutch 105 has an interlocking portion 10
5c is provided, and the interlocking lever 82 (see FIG. 1) described above is one-sidedly coupled to the interlocking portion 105c. This one-sided coupling with the interlocking lever 82 is performed by interlocking the lever 82 (switch 2
0) is in the off position, only the interlocking clutch 105 is held in the state of FIG. 4, and when in the on state, the interlocking clutch 1
05 is a free combination. That is, when the interlocking lever 105, that is, the switch 20 is turned on, the interlocking clutch 105 becomes free and is biased in the direction of arrow D by the force of the holding spring 106 as shown in FIG.

With this structure, the movement of the switch 20 in the OFF state which is manually operated from the outside is controlled by the interlocking lever 82.
Is transmitted to the interlocking clutch 105 via.

Next, the operation of the lock unit 81 according to this configuration will be described.

Normally, the switch 2 provided on the lens barrel
0 indicates an off state, which is a position moved in the direction of arrow F from FIG. In this state, the lock unit 81 is in the state shown in FIG.

In the state of FIG. 4, the operating gear 99 is in the position retracted from the lock ring 84 as shown in the figure, and the position of the output pin 99a cannot be uniquely determined by the previous operating state, but normal operation is performed. Sometimes it is in the position of FIG.

Here, when the switch 20 is manually turned on, the interlocking lever 82 moves, and the interlocking clutch 105 becomes free as described above. The interlocking clutch 105 in the free state moves in the direction of arrow D in FIG. 4 by the force of the holding spring 106. During normal operation,
The operating gear 99 and the output pin 99a in the position of FIG. 5 enter the side of the end surface 84d of the lock ring 84 in the locked position, and enter the operation standby state.

If the previous operation is the forced lock operation described later, the position of the output pin 99a becomes the position (99a ') shown by the broken line in FIG. 5, and at this time, the output pin 99a is held on the operating portion 84c. The spring 106 keeps it pressed.

As means for activating the image stabilization function,
In this embodiment, since the switch 20 is turned on and the half-press operation of the release switch of the camera (not shown) is set, the actual image stabilization start operation is started after the half-press of the release switch.

When the release switch of the camera is half-pressed, the second lens group L2 is set in a shiftable state.
The unlocking operation of the lock mechanism 81 is started.

First, the gear train (87-
95, 98) to rotate the operating gear 99 in the direction of arrow C in FIG. In the normal operating state, the output pin 99a provided on the operating gear 99 immediately pushes the end surface 84d of the lock ring 84 and starts rotating in the direction of arrow B in the figure.

If the previous operation was the forced lock operation, the position of the output pin 99a is at the broken line position (99a '), so first, while rubbing on the operating portion, rotate in the direction of arrow C and come to the solid line position. At this time, the force of the holding spring 106 causes the operating gear 99 and the interlocking clutch 105 to transition to the state shown in FIG. 3, and then to the normal operating state.

When the lock ring 84 starts in the direction of arrow B in FIG. 5, the switching portion 84f moves at the same time and the switch 103 turns off.

After that, the eccentric frame 5 in the shake correction unit 5
The four pins 70 projecting from 5 disengage from the four lock portions 84a provided on the inner circumference of the lock ring 84, and the eccentric frame 55 becomes shiftable. At this time, when the lock ring 84 rotates to the state of FIG. 6, the switching unit 84e turns on the switch 103.

When the switch 103 is turned on, the motor 85 is stopped at the same time and the lock ring 84 is held in the state shown in FIG. By this operation, the unlocking operation of the lock mechanism is completed.

In this unlocked state, since the output pin 99a is set at the top dead center position with respect to the end face 84d with the center of the operating gear 99 as a reference, it is necessary to give electricity to the motor 85 for holding. There is no. Further, due to the efficiency of the gear system (including the self-holding force if the motor 85 has the self-holding force), the coil spring 102 operates even when the output pin 99a is stopped at a position slightly displaced from the top dead center. Since the gear 99 is set so as not to be forcibly turned, the unlock holding operation is extremely stable.

The image stabilization operation is started as follows. The shake correction unit 5 starts the centering operation of the eccentric frame 55 when the switch 103 is turned off, and starts the shake correction operation when the switch 103 is turned on again.

Next, the lock operation, that is, the normal lock operation and the compulsory lock operation will be described.

The normal lock operation is performed to hold the shake correction lens L2 at the neutral position when the photographing is finished or the release button of the camera is released halfway. This normal lock operation is performed by the rotation of the motor 85 as in the unlock operation.

In order to shift from the unlocked state shown in FIG. 6 to the locked state, the motor 85 is rotated and the operating gear 99 is rotated in the direction of arrow C. When the operating gear 99 is rotated in the direction of arrow C in this manner, the lock ring 84
Starts to rotate in the direction of arrow A in the figure by the force of the coil spring 102 (see also FIG. 7), and at the same time the switch 103 is turned off. Then, the pin 70 provided on the eccentric frame 55 is pushed by the slope portion of the lock portion 84a provided on the lock ring 84 at any position where it can be shifted, and is moved and held at the neutral position in FIG.

In the state shown in FIG. 5, the switch 103 is turned on, and upon detecting this, the motor 85 is stopped. In this state, the normal lock operation is completed.

After that, when the switch 20 is turned off, the operating gear 9 is moved through the interlocking lever 82 and the interlocking clutch 105.
9 moves to the position of FIG.

The forced lock operation is an operation that becomes effective when the power is suddenly turned off for some reason (for example, the lens is removed from the camera) while the lock unit 81 is held in the unlocked state. .

When energization suddenly disappears in the unlocked state, the lock operation cannot be performed by the operation of the motor 85. In such a case, the lock operation is performed by moving the switch 20 to the off side.

When the switch 20 is moved to the off side, the interlocking clutch 105 is moved through the interlocking lever 82 to the arrow E in FIG.
, The operating gear 99 coupled to the interlocking clutch 105 also moves in the direction of arrow E, and the output pin 99a separates from the end surface 84d of the lock ring 84 (state of FIG. 4).
When the output pin 99a separates from the end surface 84d, the lock ring 84 starts rotating in the direction of arrow A in FIG. 6 by the force of the coil spring 102, and rotates to the state shown in FIG.

Then, as in the normal lock operation, the pin 70 provided on the eccentric frame 55 is pushed by the slope portion of the lock portion 84a provided on the lock ring 84 at any position where it can be shifted, and the neutral position of FIG. It is moved to and held.

In both the normal lock operation and the compulsory lock operation,
It is clear from the description of the unlock operation that the next unlock operation is not hindered.

According to this structure, in order to maintain the unlocked state, it is not necessary to always energize, and the lock mechanism is manually shifted to the locked state even in the case of an abnormal operation such as a sudden energization cut. This makes it possible to enhance the safety of the shake correction unit 5.

According to this embodiment, the shake correction unit 5 can be moved regardless of the state of the driving means (the components of which are described later) for making the transition between the movable state and the non-movable state. Since the manual locking means (the components of which are also described later) for making the correction unit 5 immovable is provided, the following effects can be obtained.

1) Since the manual lock is possible even when the power is suddenly cut off, the safety of the device can be enhanced.

2) Ordinary lock and unlock operations can be electrically controlled, and an excellent system configuration can be achieved.

3) Since a sudden power cut can be manually handled, it is possible to adopt a configuration that does not require electric power for holding the state for both locking and unlocking.

Further, the shake correction unit 5 which is a correction optical system and which constitutes a component of the driving means by the manual locking means.
Lock ring 84 for moving and holding
And the operating gear 9 that moves the lock ring 84 until the correction optical system is movable for shake correction.
Because the connection with 9 is cut (operation gear 9
The coil spring 1 for urging the lock ring 84 in the direction of returning the correction optical system when the force of 9 on the lock ring 84 ceases to act (state of FIG. 6).
By the action of 02), the mechanism can be easily configured, and the simplification, compactness and cost reduction of the device can be achieved.

(Correspondence between Invention and Example) In this example, the second lens unit L2 corresponds to the correction optical system of the present invention,
The motor 85, the gear trains 87 to 99, the lock ring 84, and the coil spring 102 correspond to the driving means of the present invention, and the switch 20, the interlocking lever 82, and the interlocking clutch 105 correspond to the manual locking means of the present invention.

The lock ring 84 corresponds to the supporting member of the present invention, the operating gear 99 corresponds to the moving member of the present invention, and the coil spring 102 corresponds to the urging member of the present invention.

The above is the correspondence relation between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions or embodiments shown in the claims or the embodiments It goes without saying that any structure may be used as long as it can achieve the function of.

(Modification) The present invention is not limited to the construction of the above-mentioned embodiment, and various kinds of electric lock / unlock mechanism and manual lock mechanism may be combined.

Although the present invention has been described as applied to a camera such as a single-lens reflex camera, a lens shutter camera, a video camera, etc., it can also be applied to other optical devices and other devices, and also as a constituent unit. Is something that can be done.

[0109]

As described above, according to the present invention,
Providing a manual locking means for making the correction optical system in the immovable state regardless of the state of the driving means for shifting the correction optical system between the movable state and the non-movable state, and performing the external operation. Thus, the correction optical system can be placed in an immovable state.

Therefore, when the power supply is suddenly cut off and the driving means becomes inoperable, without using electric power,
The correction optics can be placed in a safe and immovable state.

Further, according to the present invention, the support member for moving and holding the correction optical system to a predetermined position and the support member are moved until the correction optical system becomes movable for shake correction. A manual locking means for disconnecting the connection with the moving member is provided, and by this manual locking means, the connection between the supporting member and the moving member, which is a component of the driving means, is cut, so that the correction optical system is forced (appended. (Due to the action of the biasing member)
It is placed in an immovable state, that is, in a locked state.

Therefore, with the simple mechanism, the correction optical means can be moved to the immovable state at the time of the sudden power-off, and the simple mechanism can contribute to the downsizing and cost reduction of the device. It will be possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing a zoom lens barrel according to a first embodiment of the present invention.

2 is an exploded perspective view showing a shake correction unit incorporated in the lens barrel of FIG. 1. FIG.

3 is a development view showing a lock mechanism at the time of operation of the shake correction unit in FIG. 1. FIG.

4 is a development view showing a forcibly locked state of the lock mechanism of FIG. 1. FIG.

5 is a plan view showing an operating state of the lock ring of FIG. 1. FIG.

FIG. 6 is a plan view showing an operating state of the lock ring of FIG. 1.

FIG. 7 is a configuration diagram showing an entire lock mechanism of FIG. 1.

[Explanation of symbols]

 20 switch 81 lock unit 82 interlocking lever 85 motor 87-98 gear 99 operating gear 102 coil spring L2 second lens group

Claims (2)

[Claims] 1. A correction optical system for correcting image shake caused by shake applied to the apparatus, and image shake suppression for suppressing the image shake by moving the correction optical system in a direction other than the optical axis. In the image shake correction apparatus, the image blur correction apparatus includes a driving means for transitioning the correction optical system to a movable state and a non-movable state, and the correction optical system is provided regardless of the state of the driving means. An image blur correction device, characterized in that a manual lock means is provided to make it immovable. 2. The drive means moves a support member for moving and holding the correction optical system to a predetermined position, and moves the support member until the correction optical system is movable for shake correction. And a biasing member that biases the support member in a direction to return the correction optical system when the force exerted on the support member by the move member ceases to act. The image blur correction device according to claim 1, wherein the locking means is means for disconnecting the connection between the moving member and the support member.