JPS59186381A - Engaging device for piezoelectric bender - Google Patents

Abstract

PURPOSE:To increase the displacement amount of a bender, to take the distance between the engaging position and the engagement releasing position larger and to simplify the asembling of the titled engaging device by a method wherein voltage is impressed on the piezoelectric bender, the bender is displaced and engagement or release of the operating part of the mechanical device is performed according to the displaced positions. CONSTITUTION:The rear cap 1h and the lock opening and shutting lever 1j of a camera 1 are locked, a finder window 1d and a window 1c for image are opened by operating a control protrusion 3 and, interlocking thereto, the main switch S0 of an operating circuit is closed. By this switch S0, a boosting circuit 52 is actuated and a capacitor C is charged. Then, by the operation of a release button 1f, an automatic focusing and a pulse generating circuits 50 and 51 are respectively actuated, a high voltage signal is applied to a piezoelectric bender 16 and the bender 16 is displaced. By this method, the coupling part of a lens holding member (operating part) is engaged and after the displacement of the bender 16 was completed, the generation of pulse is stopped, a transistor Tr2 is non-conducted, the bender 16 is made a double-action and the coupling part of the operating part is released and the distance between the engaging position and the releasing position is increased.

Description

Detailed Description of the Invention Technical Field The present invention uses a piezoelectric bender as a mechanical locking member that engages and locks an operating part of a mechanical device and releases the engagement to enable operation. This invention relates to a locking device.

Conventional technology Conventionally, by utilizing the property of piezoelectric bending when voltage is applied to it, it bends to the operating part of a mechanical device in either the position when voltage is applied or the position when no voltage is applied. Locking devices are known which are configured to engage and lock the piezoelectric bender, and to release the lock in the other position to allow actuation. After this, if the voltage is cut off, it will quickly return to a certain extent or remain as hysteresis, and will not return to its initial state until a very long period of time has elapsed. It becomes extremely small, and locking and unlocking may not be possible reliably due to manufacturing and assembly errors in the piezoelectric bender and mechanical equipment.If manufacturing accuracy and assembly accuracy are controlled, reliable locking and unlocking may occur. In reality, it is difficult to do this, as it would be extremely costly and time-consuming.

Therefore, it has been difficult to obtain a locking device that can perform reliable locking and unlocking using a piezoelectric bender.

OBJECTIVES An object of the present invention is to provide a piezoelectric locking device that can reliably lock and release a mechanical device.

Examples Examples of the present invention will be described below with reference to the accompanying drawings. 5 to 7 show examples in which the present invention is applied to a camera. FIG. 5 shows a thin, lightweight camera using a disc film cartridge, which camera is equipped with the piezoelectric pen locking device of the present invention. The camera (1) has a thin, approximately rectangular parallelepiped shape with its m1 surface and rear surface biased. A protruding central protrusion (1b) is formed in the front part (1a), which forms the front surface, towards the middle right when viewed from the front, and the right end of the central protrusion (1b) is formed. A photographing window (IC) is formed on the side, and a photographing lens (2) is disposed inside the photographing window (IC). Also, the camera (
1) A finder window (1d) is arranged in the upper right corner of the front eccentric plane (1a) when viewed from the front, and the finder window (1d) and the photographic window (IC) are installed in the frame of this window. An operating protrusion (3) of a shielding plate (not shown) that opens and closes is installed so as to protrude toward the front of the fire extinguisher. By sliding the operating projection (3) to one side, the finder window (1d) and the photographing window (IC) are shielded.

On the other hand, the light receiving element window (1g) for photometry is located approximately in the upper center of the nfI flattened plane a), the light emitting unit (1e) of the flash device is located at the upper left corner, and the release button (1f) is located at the lower left corner. ) or are arranged.

Most of the rear of the camera (1) or the cartridge chamber cover (
The cartridge chamber cover (1h) is supported by a hinge on the camera (1) at the bottom so that it can be opened and opened, and the photographic lens (2) is attached to the top surface (11) of the camera (1). The upper part of the cartridge chamber cover (1h) is locked to the camera (1) by operating a lock opening/closing lever (IJ) pivotally connected by a shaft substantially parallel to the optical axis, thereby closing the cartridge chamber cover (1h). Then, by releasing the lock, the lid (1h) is opened and the film cartridge can be loaded or removed.

FIG. 6 shows the shutter device of the camera (1) shown in FIG. Storage is provided. Therefore, this nya soter device is constructed to have an eccentric shape as a whole.

Reference numeral 22 denotes a rotary disk which is rotatably mounted on a substrate (not shown) 2 about an axis substantially parallel to the optical axis of the photographing lens. The surface (2213) of the rotating disk (22) on the front side of the camera
) A shutter actuating member (4) protruding from the outer periphery is screwed. An interlocking member (6) rotatably supported by a shaft (5) on a substrate (not shown) is installed near the rotating disk (22). The interlocking member (6) has first and second branches (6C) (6d) extending in substantially opposite directions from the axis 5) and a third branch (6CX6d) extending substantially perpendicularly to both branches (6CX6d). A substantially T-shaped member consisting of 6"),
The first branch (6C) extends in the direction of rotation circle 1 (22),
The rotation locus of the bent end (4a) of the drive pin (5, b) installed on the protrusion (6a) further protruding from one end or the bent end (4a) of the soter operating member (4) on the rotating disc 2) It is arranged so that it can come into contact with the inside. Further, the middle portions of the second branch portion (6d) and the third branch portion (6f) are connected by a bridge portion (6h).
) on which a pin (6e) is set.

Furthermore, another pin (43) is implanted on the board (not shown), and a spring (7) is wound around the qql+f5).
), the interlocking member (6) is stopped at a neutral position by elastically holding the pin (6e) and the pin (43) at the same time.

The first and second branches (6c) (6C') of the interlocking member (6)
) at the ends of the first and second shutter blades (8) +
The arm portion of 9+ is rotatably supported. The first and second shutter blades; 8) and 119) are arranged so as to overlap each other when the shutter is not activated, and the camera (1)
It is coaxial with the photographing lens (2) of
) to guide the subject light received at the film surface onto the film surface (
↑O) is covered at the same time. Further, the first and second shutter blades 18)+9+) are each provided with one large aperture having a large aperture diameter and one small aperture having a small aperture diameter. Large opening (8b) of the first shutter blade (8)
-6 small aperture (8C), the large aperture (91) of the second shutter blade (9), and the small aperture (9C) are each located at approximately symmetrical positions with respect to the optical axis of the photographing lens (2), and the large aperture (
81)) (9b) and the small apertures (8C) and (9C) are also located at approximately symmetrical positions with respect to the optical axis of the photographic lens 1.2). Therefore, by moving the shutter blades (8+j9) evenly in opposite directions, large openings (8b) (9b) can be created.
It is possible for the small apertures (8C) (9C) to interact with each other on the exposure aperture, ↓0). In addition, shutter blade: 8) t9i:'i 2 regulation pins 1411 t
42), the direction of movement is restricted.

This is a tuning switch for emitting light from the (46+J) flash device, and when the subject brightness is low, the interlocking member (6) rotates counterclockwise and bends the tip of the third branch (6f) downward. Projection (6
g) Contact the synchro contact piece (46a), curve it and bring it into contact with the synchro contact (46b). At this time, if the flash device is turned on by automatic or manual setting, the flash device emits light.

On the surface of the rotating disk 22) on the rear side of the camera, there is an internal gear (2) centered on the rotation axis of the rotating disk 1.22).
2d) is formed, and a planetary gear (not shown) of a known planetary gear mechanism meshes with the internal gear (22d), and a sun gear (not shown) meshes with the planetary gear.

The sun gear is connected to the camera's film advance mechanism.

The shaft shown in FIG. 7 is a motor, and a gear X31) is installed on the motor shaft;
) is connected to the gear (33). A carrier gear (not shown) of a planetary gear mechanism is connected to the gear (33), and a planetary gear is pivotally mounted on the negative side of the carrier gear. When the planetary gear rotates due to the rotation of the motor (M), the rotation of the planetary gear can be transmitted to the internal gear (22d) or the sun gear (not shown), but at the end of shooting -y
The load on the film advance mechanism is lightened, the sun gear rotates, and the film is only advanced. When the film advance is finished, the camera's detection pin fits into the notch formed to correspond to the frame to be photographed on the film, and the film advance begins. I can't stand it, (
(Refer to Japanese Patent Laid-Open No. 57-172325), since the load on the sun gear becomes heavy, the rotation is transmitted to the internal gear (22d).

It becomes like this.

The rear surface of the rotating disc V22) has a cam groove (
22a) is formed, and the cam groove (22a) has a shape in which a part of a circle centered on the rotation axis of the co-moving disk j22) bulges outward. Further, a pin (19a) implanted in a collateral lever (19)l installed near the rotating disc 22) is fitted into the cam groove (22a). The control lever (19) is pivotably supported at one end on a base plate (not shown), and is rotated clockwise by a spring (21).
The one facing away from the secondary disk 122) is energized. Also, a control pin (19b) is attached to the other end of the control lever (19).
) have been planted.

Near the rotary disk (22), a lens holding member 113 is further supported at one end (a lens holding member 113 provided with an auxiliary lens (12) for close-up photography).Lens holding member 113
) is biased in the 3'' direction by the 1'X pin (15), and the control pin of the control lever (19)'' is applied to the tail cam portion (1, 3b) formed at the other end. (191)) came into contact with it, resisting the A' force and stopping it.

In this stopped state, the auxiliary lens (12) is located in front of the photographing lens (2) of the camera. Furthermore, engagement steps (1, 3a) according to the locking device of the present invention are formed on the rear surface of the camera (lower surface in the figure) of the lens holding member (13), and the end portions of the piezoelectric helter ilG+ described later are formed. It is configured to be able to engage with the engagement step (+33.).

The piezoelectric bender (16), whose side view is shown in FIG. A tongue-shaped member formed by pasting a plate on both sides of a plate, which bends when a voltage is applied between the piezoelectric elements on both sides or between the central metal plate and the piezoelectric element on the surface, and the applied voltage is removed. It has the property of returning to its original shape.

FIG. 2 shows the relationship between the applied voltage and the amount of displacement of the piezoelectric converter Q[i). Figure 2, 8 When the applied voltage is removed, the piezoelectric helter rapidly moves back, and then it takes a long time to completely return to its original state. The difference is extremely small.
The amount of displacement can be increased by applying a reverse voltage.

In this embodiment, as shown in FIG. 9, the piezoelectric bender (IG) is engaged with the engagement step portion (13a) of the lens holding member (13) in a state where no electric power is applied and the piezoelectric bender (IG) is not displaced at all. If the distal end moves downward from this state, it will be in an unengageable state as shown by the dashed line in the figure. Furthermore, if the tip is displaced upward, the amount of engagement with the locking step (13a) becomes smaller, as shown by the solid line in the figure, and the engagement becomes more secure.

However, the piezoelectric bender (16) and lens hold member (
13) are installed very close to each other with only a small distance between them, so depending on this distance, when a voltage is applied, the tip of the piezoelectric bender (1G) (two-sided force) may Lens hold member 1 comes into contact with the bottom surface.
13) There may also be cases where you press f l2・＼. However, this force does not deform the lens holding member (13), and at this time, as will be described in detail later, the lens holding member (13) is still operating and the application of the chair voltage is released and the piezoelectric bender ( 16) Since it is configured to operate only after the double movement, Fig. 8 +C+;
If the configuration is such that it does not come into contact with the lens holding member (13) in this state, even if the piezoelectric member (16) is displaced and comes into contact with the lens hold member (+At13), the operation of the lens hold member (13) will be inhibited. It will never happen.

Also, pressure! If it comes into contact with the pen goo (16) or the lens holder (113), the displacement of the piezoelectric bender (16) will be inhibited, and it is conceivable that it will not be able to move to the position shown by the dashed dotted line (A) in Figure 8. Or, even in that case, remove the voltage from the piezoelectric bender (16).
is displaced to a position not shown by the solid line (C) in FIG. 8, and the lens holding member (13) can be properly locked.

In this embodiment, a parallel type piezoelectric heater is used that applies a voltage between the central metal plate and the piezoelectric element on the surface, and one end is fixed to the substrate (not shown) by a holding plate 117), and the other end is The free end is in a position to engage with the engagement step (L12). Moreover, the piezoelectric bender (16) is the first
As shown in the figure, the switch (So) (Sl) (Sz
), one electrode is attached to the piezoelectric element material (16b) on both sides, and a metal plate ( The capacitor (C1:t capacitor, (5
2) is the Shoryu circuit for charging the capacitor (C1).

Next, the function C of the present invention will be explained.

The back cover (lh) of the camera (1) shown in Fig. 5 is closed, locked by the lock opening/closing lever (IJ), and the viewfinder window (1d) is opened by operating the operating projection (3).
) and the photographing window (IC) are opened, the main switch (So) shown in Figure 1 is closed in conjunction with these, and power is supplied to the Shoryu circuit 152), and for a short time (this capacitor (C): Kotaka Electric Works is charged.

Next, when you press the release button (1f), the switch (S
l) (S2) is closed, and as shown in Figure 1, the autofocus circuit is activated) and a pulse is generated [v1 path 51) +
For example, a high voltage signal shown in FIG. 3 (IS) is supplied to the piezoelectric bender (I
G) is applied to the base terminal of the transistor (Tr 2 ) for a very short period of time, and the same transistor ('I''r2) generates a pulse for a very short period of time. Transistor ('T'!
-2), the electric charge that had been charged in the capacitor (C) is discharged through the collector-emitter of the transistor (Trz), and is transferred to the metal plate (16) of the piezoelectric converter (16) via the resistor (1). A voltage is applied to the piezoelectric bender f16) with the piezoelectric element 16C) as the positive electrode and the piezoelectric element (161) attached on both sides as the negative electrode. This application causes the piezoelectric bender (16);
) is displaced to the state shown.

After the displacement of the piezoelectric converter (16) is completed, the pulse generation ends and the transistor (Tr2) becomes non-conductive, and the voltage application to the piezoelectric converter t16+'\ disappears, and the piezoelectric converter (16) returns to its original position, but at this time , it is not possible to return to the horizontal position due to hysteresis, and the solid line (C) in Figure 8
(It returns to the position shown here. At this time, the piezoelectric venter j1
6); The seat is in contact with the lens holding member (13) and is in a position where it can be engaged with the engagement step (13a).

Next (for example, when the subject distance is relatively far, for example, 1.2m-■, the autofocus circuit outputs a high-precision rl signal for a certain period of time at the timing shown in Figure 3 (Al). This is applied to the base terminal (c) of the transistor (rrl), and the transistor (T"rx) becomes conductive. As a result, the charge that had been stored in the capacitor tq is transferred between the collector and emitter of the transistor (Trl). The piezoelectric element (16b) is discharged through the piezoelectric element (16b) and is pasted on both sides of the piezoelectric hengoo (16) through the resistor (l support 2).
Voltage is reversely applied to the piezoelectric bender (16) using f as the positive electrode and the central metal plate (16c) as the negative electrode. As a result of this application, the piezoelectric venter (16) is displaced from the position shown by the solid line (C) in Figure 8 to the position shown by the dashed line (N''J).However, if the object distance is within 1 or 2 meters, the automatic The focus circuit (50) does not output a high voltage signal, and the piezoelectric bender (16) remains as shown by the solid line +q in FIG.

When the piezoelectric bender (16) is at the thick line fcl in Figure 8, its free end (t6a) is at the lens holder (13) in Figure 7.
The piezoelectric venter (1G
) is located at the dashed line (■) in Figure 8, its free end is located below the engagement step (13a) in Figure 7, that is, toward the rear of the camera, and the engagement step (13a) is located below the engagement step (13a) in Figure 7. The only thing I can do is lock it.

After a signal is output from the autofocus circuit (off) according to the subject distance, it is subsequently linked to the release operation,
Electricity is supplied to the motor Mli by a motor drive circuit (not shown) shown in FIG. is in the forward direction, in the case of high brightness (this is in the opposite direction / rotates.

The rotation of this motor Nη or the gear 131) 132) i3
3+ to a planetary gear mechanism (not shown). At this time, if film feeding is completed, film feeding cannot be carried out as mentioned above, and since the load on the sun gear is large, the rotation of the motor is transferred to the internal gear (22d) of the rotating disc t22). It is transmitted and the rotating disk: z2) 乃) rotates.

When the motor ¥) rotates in the normal direction, the rotating disk 122) is shown in Figure 6.

Rotate clockwise from the position shown in Figure 7. As a result of this rotation, the bottle (L9a), which was originally fitted in the farthest position from the rotation center in the cam groove (22λ), is pulled toward the rotation center according to the shape of the groove, and the control lever 1
9) or counterclockwise against the biasing force of (21).
Rotate. Control lever (19j J2 control pin (19
b') is the tail cam part (1,
31)) Slide the top of the pin (19a) or the most rotating circuit.
22) in the direction of the rotation axis ＼When approaching, the tail cam part (13
1)) to the position facing the fourth part (L3C).

At this time, as mentioned above, if the subject is far away, the free end (], 6a) of the piezoelectric bender f16) is displaced to the position indicated by the dashed line p in FIG. 3a), so the lens hold member (13)
is rotated clockwise by the biasing force of the wing (15) and retreats from the front of the auxiliary lens (12) or photographic lens (2), enabling long-distance photography. In addition, (/nsholt part 1'
A' 113) ”, i pin area) and stops.

On the other hand, at this time, when the subject distance is near MIF (here, the free end (16a) of the piezoelectric venter (1G)
Because it is at the position of the force line (C) in the 8th figure that can come into contact with a),
Lens hold member' t13] M When rotated slightly clockwise/＼, engage protrusion (13a) or piezoelectric bender (1
6), and the lens holding member (13) cannot rotate any further.

At this time, the optical axis of the auxiliary lens (12) and the photographing lens (2)
The optical axes of the two will align, allowing close-up photography.

The rotating disk +22j further rotates, and the shutter actuating member (
The bent end (4a) of 4) kicks the drive pin (, 613) on the interlocking member (6) from the right to the left in Fig. 6 to rotate the interlocking member (6) about the axis 5). Rotate counterclockwise.

Due to this rotation, the interlocking member (6) pulls the first shutter blade (8) pivotally attached to the first branch (6C), and the second branch (6C) pulls the first shutter blade (8).
Push the 82-inch blade (9) pivotally attached to 6d) and open both blades + 8)t, the large opening (8b) of 9) (91)
) are superimposed on the exposure aperture (10) and exposed using a fully open aperture and low speed shutter.

The rotary disk (22) further rotates and the shutter actuating member:
When the bent end (4a) of 4) is released from contact with the drive pin (6b), both ends (7a) (71)) or the pin (
6e) f43) i The first hinge (7)
) causes the interlocking member (6) to move back to the neutral position, and the shutter blade L8) 19) moves back to close the shutter. After this, the rotary disc X22) rotates clockwise by the fourth turn, and just before stopping after making one rotation, the pin (19a) is rotated according to the shape of the cam groove (22a) and the biasing force of the spring (21); The control lever (19) rotates clockwise and the recess (1) of the lens holding member (13)
3C) Climb onto the control pin (19b) or the tail cam part (L3b) that was facing you. Lens hold member (13
) resists the biasing force of the spring (15) and rotates counterclockwise to a large extent after long-distance photography, and to a small degree after close-range photography, and returns to the initial position. The rotary disk (22) rotates once and stops at the initial position, and the photographing is completed.

The high voltage signal outputted from the autofocus circuit during long-distance shooting is cut off after a certain period of time, and the transistor (Trl) connected to the circuit shown in FIG. 1 is rendered non-conductive. As a result, no voltage is applied to the piezoelectric bender (16), and the piezoelectric bender (16) returns to its original position.

However, it is not possible to completely return to the horizontal position from the hysteresis point, and the position returns to the position shown by the solid line FB+ in FIG.

Furthermore, when the next photograph is taken, the switch C3O) (5
1) Be closed (from this pulse generation circuit (51)
A high voltage signal is emitted from the transistor (T
r 2 ) conducts between them and a voltage is applied to the piezoelectric bender (4), and the piezoelectric bender (16) first moves along the dashed line (
A+, and then the application is removed to move to solid line +c) in FIG. 8, and it becomes possible to reliably engage with the engagement stepped portion (13a).

When the motor (M15) is reversed by the high-intensity signal, the rotating disk (22) rotates counterclockwise from the position shown in FIGS. 6 and 7. This rotation also causes the pin (19a
) is pulled toward the center of rotation, and the piezoelectric bender (1
6), the lens hold portion H113) b) is locked or unlocked, and photography is performed according to the subject distance. In this case, since the rotating disk (22) rotates counterclockwise, the kicking direction of the driving pin (6b) by the shutter actuating member (4) is opposite to that in the above case, and the interlocking member (6) rotates clockwise.

Therefore, the first shutter blade (8) is pushed and the second shutter blade (9) is pulled so that the small apertures (8C) (9C) overlap each other, and exposure is performed by a small aperture high-speed shutter. After this, the rotating disk 122) rotates once for the first time.
It stops at position 71 and the shooting ends.

After this, when the shooting is finished, the film advance is unlocked and the load on the sun gear of the planetary gear mechanism mentioned above is reduced.
When the motor M) is rotated by a motor drive circuit (not shown), the sun gear rotates and the film is advanced one frame.This mechanism is not related to the gist of the present invention and will not be described here.

In the second explanation, the piezoelectric bender is either a parallel type or a series type.
Connect one piezoelectric element ＼ through a resistor (kl) from
It may be connected to the other piezoelectric element via the resistor (R2).

Also, in the above explanation, a pulse was first generated after the release to move the piezoelectric sensor to the locking position shown in FIG. In this case, it is sufficient to generate pulses only when long-distance photography is performed and a voltage is applied to the piezoelectric bender.

In addition, in the explanation in ``-'', the auxiliary lens for close-range photography is always positioned so as to cover the front of the photography lens, and the auxiliary lens is retracted from the front of the photography lens only during long-distance photography, but the opposite is true. It may be configured such that the auxiliary lens is always retracted and covers the front of the photographing lens only during close-range photography. In this case, when shooting at close range, the auxiliary lens moves relatively large and rapidly and forms four main bodies in front of the photographing lens, so it is possible that the auxiliary lens is repulsed, and it is necessary to install a cushion, etc., to prevent repulsion. is good. In this case, contrary to the second embodiment, the locking is performed during long-distance imaging, and the locking is released during close-range imaging.

As described above, the locking device of the present invention is suitable for use in a simple automatic black shoe device of a camera, but it can also be used for locking a shutter opening member of a shutter device or a shutter closing member of a camera, It can be used as a lock for controlling the aperture value of a lens aperture device, and can also be used as a safety device not only for cameras but also for electrical products and other devices in general to prevent them from accidentally turning on and off during some kind of operation. It can be widely used as a locking device.

Effects As described above, in the present invention, the piezoelectric bender is displaced by applying a voltage to the first point, and the actuating part of the mechanical device is locked or unlocked at the displaced position, and the piezoelectric bender is caused to -[ , l A reverse voltage was applied to cause a reverse displacement, and then the lock was released or locked at the position when the voltage application was cut off. For this reason, we have increased the amount of displacement of the piezoelectric bender (by increasing the distance between the locking position and the unlocking position). A locking device can be obtained.

[Brief explanation of the drawing]

Figure 1 shows the operating circuit and reciprocating circuit of one embodiment of the present invention.
! Figure 2 is an explanatory diagram showing the relationship between the applied force and displacement of the piezoelectric hengoo, and Figures 3 to 4 show pulses emitted from the actuating circuit and reciprocating circuit of the embodiment of the present invention. Explanatory drawings, FIG. 5 is an external perspective view of a camera to which the present invention is applied, and FIG. 6 is a front view of the shutter device of the camera;
FIG. 7 1 is a perspective view of the main parts of a simple automatic focus adjustment device to which an embodiment of the present invention is applied, FIG. 8 is an explanatory diagram showing the displacement of a piezoelectric bender according to the same embodiment, and FIG. 9 is an explanatory diagram showing displacement of the piezoelectric bender according to the same embodiment It is an explanatory view showing an installation position and displacement of an example piezoelectric bender. 1...Camera, 2...Photographing lens, 12
Auxiliary lens, 13... Lens hold member (operating part),
13a...Engagement step part (engagement part), 16...-Piezoelectric penter. Applicant Minolta Camera Co., Ltd.

Claims (1)

[Claims] 1. A locking device for locking an operating part of a mechanical device,
An engaging part provided in the actuating part, a piezoelectric bender having one end as a fixed end and the other end as a free end that can be displaced between an engaged position and a non-engaged position with the engaging part, and an actuation signal. an actuating circuit that applies a voltage to the piezoelectric bender to move it through 10,000 displacement positions; and a backward motion signal that applies a reverse electric current to the piezoelectric bender for a predetermined time, then releases it and moves it to the other displacement position. A piezoelectric bender locking device with a double-acting circuit. 2. The actuating part of the mechanical device is separated from the free end of the piezoelectric bender before actuation, and is moved to the engagement position by the actuation start operation. Stop device. 8. The piezoelectric helter locking device according to claim 2, wherein the double-acting signal is input to the double-acting circuit immediately before the actuating section starts operating, so that a reverse voltage is applied to the piezoelectric bender. 4 The double-acting signal is activated by the actuating part, and after the retaining part engages with the free end of the piezoelectric helter or passes the engagement position with the free end, it is input to the double-acting circuit and applies a reverse voltage to the piezoelectric helter. A piezoelectric penter locking device according to claim 1, characterized in that: 5. The piezoelectric Henter locking device according to claim 1, wherein the operating part of the mechanical device is a holding member for a shooting distance adjusting lens of a camera, and the operating circuit is an automatic focus adjustment circuit of a camera. . 6. A shutter operating member that rotates once by a drive motor that is powered and rotated by a release signal generated by pressing the shutter button;
and a control member that reciprocates once in conjunction with the rotation of the shutter operating member. (The shutter opens and closes from this, and the shack-actuating member rotates, causing the antibacterial member to move back and return the operating part of the mechanical device to its initial position,
6. The piezoelectric bengoo locking device according to claim 5, wherein the shutter actuating member rotates once and then stops.