JP2004092891A - Engagement release/damper mechanism utilizing shape memory alloy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accurate engagement release/damper mechanism without requiring much space by utilizing a wire-like shape memory alloy (SMA). <P>SOLUTION: A flash emission section energized toward a projection position is stored and retained in a camera body by allowing a locking lever 60 to be engaged to a locking nib 21. When the wire-like shape memory alloy 40 connected to a rotary lever 50 is energized for shrinkage, the rotary lever 50 is rotated, the locking lever 60 is disengaged from the locking nib 21, and a pop-up operation is started. The initial move of the flash emission section in pop-up is damped by allowing the rotary lever 50 to charge a coil spring 88. After that, damper effect is given and the flash emission section is moved to an actuation position by damping force generated by allowing an arm 71 in a brake lever 70 to charge the coil spring 88. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disengagement and damper mechanism using a shape memory alloy. This mechanism is used, for example, in a camera or the like having a built-in pop-up type flash light emitting unit, to disengage the flash light emitting unit engaged and held at the standby position to start the pop-up operation, and to provide a shock when the pop-up operation is completed. This is convenient for use as a disengagement and damper mechanism capable of providing a damper effect to reduce the effect.
[0002]
2. Description of the Related Art
For example, a single-lens reflex camera, a compact camera, or the like that has a built-in flash light emitting unit of a pop-up type is conventionally known. This is because, as schematically shown in FIG. 1, when the flash is not used, the flash light emitting unit 10 is stored in the camera body (FIG. 1A), and when the flash is used, the flash light is emitted. The unit 10 pops up in a pop-up manner (FIG. 1B).
[0003]
The flash light emitting unit 10 is urged toward a use position (or an operation position) in FIG. 1B by a spring (not shown). However, the flash light emitting unit 10 has a rotating lever 11, and when this lever is engaged with a locking claw 21 fixed to the camera body side, the flash light emitting unit 10 is moved to the storage position shown in FIG. (Or the standby position).
When the rotating lever 11 is disengaged from the locking claw 21 when necessary, the flash light emitting unit moves from the storage position to the use position by the urging force of the spring. The flash light emitting unit 10 stops at the use position when a part thereof comes into contact with (collides with) a stopper part (not shown).
[0004]
In such a pop-up type flash mechanism, there is a demand that the impact when the flash light emitting portion 10 hits the stopper portion is large, and the impact is absorbed by some means.
[0005]
For this reason, conventionally, cushioning material for absorbing shock is conventionally arranged at the stopper portion, but it is not possible to sufficiently absorb the shock by itself, and the flash emission is not performed because the cushioning material is arranged. There is a possibility that the positioning accuracy of the part 10 at the use position is deteriorated.
In some products, a damper member is arranged on the hinge portion 30 serving as a pop-up rotation axis. However, the size of the damper member is large, which hinders miniaturization of the product.
Furthermore, since it is necessary to separately provide the damper mechanism and the lock release mechanism, there is a problem that the number of parts increases and the manufacturing cost increases.
[0006]
In view of the above-described conventional circumstances, an object of the present invention is to provide a space-saving and high-precision engagement release / damper mechanism using a wire-shaped shape memory alloy (SMA).
In addition, mechanisms for performing disengagement using SMA at the time of pop-up of the flash unit are conventionally known (for example, see Patent Documents 1 and 2), but they do not include a damper mechanism.
[0007]
[Patent Document 1]
JP-A-10-301168 (paragraph number 0024, FIG. 1)
[Patent Document 2]
JP-A-2000-330640 (paragraph number 0153, FIG. 17 and FIG. 18)
[0008]
[Means, actions and effects to solve the problem]
The present invention has been made in order to effectively solve the above-mentioned problems, and provides an engagement release / damper mechanism having the following features.
[0009]
The disengagement / damper mechanism of the present invention includes a “drive target portion that is movable between a standby position and an operation position and is attached to the base portion in a state of being biased toward the operation position”. A "rotating lever that engages the base portion and the driving target portion and holds the driving target portion at the standby position against the urging force" and "a rotating lever that is connected to the Is retracted to rotate and rotate the rotating lever, thereby disengaging the base portion and the drive target portion, thereby holding the wire-shaped shape memory alloy (SMA) and the And a brake drum composed of a coil spring having a coil member passing through a cylindrical member '' and a `` braking member for charging the coil spring in conjunction with the movement of the driven object to the operating position ''. I have.
When the rotating lever is rotated due to the contraction of the shape memory alloy, the initial movement of the driven portion is braked by charging the coil spring. Thereafter, the braking member moves the drive target portion to the operating position while giving a damper effect by a braking force generated by charging the coil spring. (Claim 1)
[0010]
In the disengagement / damper mechanism of the present invention having the above configuration, the disengagement and the damper effect at the time of pop-up can be achieved with only one drive system for turning on / off the energization of the SMA. Therefore, downsizing of the entire device can be achieved. Further, the number of parts and the manufacturing cost can be reduced.
[0011]
Further, according to the present invention, the “drive target unit that is movable between the standby position and the operating position and is attached to the base unit in a state of being biased toward the operating position” and “the base unit A rotating lever that engages the driven part and holds the driven part in the standby position against the urging force, and is connected to the rotating lever, and contracts when energized and the temperature rises To rotate the rotation lever in the first direction, thereby disengaging the base portion and the drive target portion, and providing a disengagement and damper mechanism including a wire-shaped shape memory alloy. Is done.
In the disengagement / damper mechanism, when the engagement is released and the driven part moves toward the operating position, the braking protrusion that protrudes from the driven part or the base part is attached to the rotating lever. It presses against the formed braking surface, whereby the movement of the driven object is braked. Thereafter, the force by which the braking projection presses the rotating lever in the second direction opposite to the first direction, and the shape memory alloy, which is gradually deenergized and gradually extended from the energized state, is moved to the rotating lever. The driven part is moved to the operating position while giving a damper effect by the balance with the transmitted reaction force. (Claim 4)
[0012]
According to such a configuration, it is not necessary to separately prepare a brake drum in addition to the rotating lever, so that further downsizing and cost reduction can be achieved.
Further, in this configuration, a damper effect is provided by utilizing the expansion of the SMA due to heat radiation for a limited time after the power is turned off. That is, unlike a normal damper mechanism, the damper effect is exhibited only when the damper effect is required, and at other times, the drive can be performed without a load by the damper.
[0013]
A typical example of the drive target unit in the present invention is a pop-up type flash light emitting unit built in a camera, but is not limited to this. The present invention is applicable to any mechanism or member that moves to the operating position by the urging force of the urging means.
[0014]
Here, the “standby position” means a position where the driven unit does not need its function and stands by, and may be considered as a “storage position” when the driven unit is a flash light emitting unit. it can. The “operating position” means a position where the drive target unit can perform its original function, and thus can be considered as a “use position”.
Further, the “base portion” is a base on which the drive target portion is mounted. The drive target moves relative to the base between a standby position and an operating position. In the case of a flash light emitting unit, for example, the camera body corresponds to the base.
[0015]
In the present invention, the engagement between the rotating lever and the locking claw is used to engage and hold the driven object at the standby position. However, when the rotating lever is provided on the driven object side, Alternatively, the locking claw may be provided on the base portion side. Conversely, when the locking claw is provided on the drive target portion side, the rotating lever may be provided on the base portion side. In the present invention, the relative arrangement positional relationship is not limited to a specific one.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a longitudinal sectional view schematically showing a camera according to one embodiment of the present invention.
[0017]
The flash light emitting unit 10 is attached to the camera body 20 so as to be able to pop up. The flash light emitting unit 10 is urged by a pop-up spring (not shown) to an operating position (use position) exposed at the top of the camera, but a locking lever 60 is attached to a locking claw 21 fixed to the camera body side. By being engaged, it is held at the standby position (storage position) shown in FIG.
[0018]
When the flash is used, when the engagement between the locking claw 21 and the locking lever 60 is released by a method described later in detail, the flash light emitting unit 10 causes the rotating shaft 30 to move by the urging force of the pop-up spring. The light-emitting surface 15 pops up in the direction of the arrow as the center, and is exposed toward the front of the camera.
[0019]
FIG. 3 is an enlarged view of a main part of the engagement release / damper mechanism provided inside the flash light emitting unit 10 shown in FIG.
[0020]
The wire-shaped shape memory alloy (SMA) 40 has one end fixed to the first arm 51 of the rotating lever 50 and the other end fixed to a fixing pin 41 (see FIG. 2) provided in the flash light emitting unit. The rotation lever 50 is urged clockwise in FIG. 3 by a spring (not shown), but is held at the position shown in FIG.
[0021]
When the SMA 40 is heated by energization, the SMA 40 contracts (shrinks and shortens) to the storage length, and rotates the rotation lever 50 counterclockwise in the figure. As a result, the second arm 52 of the rotating lever 50 presses the first arm 61 of the locking lever 60. The locking lever 60 is urged in a counterclockwise direction by a spring 66, but is rotated clockwise by being pressed by the arm 52. Thereby, the second arm 62 of the locking lever 60 is detached from the locking claw 21.
Note that an electric circuit for supplying power to the SMA 40 is preferably arranged on the camera body 20 (see FIG. 2).
[0022]
Braking of initial movement ( Initial braking )
At the same time as the second arm 62 is disengaged from the locking claw 21 due to the contraction of the SMA 40, the third arm 53 of the rotating lever 50 charges the brake spring 88. A brake drum 85 is inserted through a coil portion 88a of the brake spring 88. When the spring 88 is charged, the diameter of the coil portion 88a is reduced, and the brake drum 85 is tightened to obtain a braking effect. That is, when the third arm 53 charges the brake spring 88, the initial movement of the flash light emitting unit at the time of pop-up is braked.
[0023]
Braking after initial braking
Thereafter, since the energization is turned off, the contracted SMA 40 extends to the length before contraction. As a result, the rotating lever 50 is rotated clockwise by the spring (not shown), and the charge of the brake spring 88 by the third arm 53 is gradually released, and the braking effect thereby becomes smaller. However, instead, the arm 71 of the brake lever 70 charges the brake spring 88 in conjunction with the pop-up movement of the entire flash light emitting unit, whereby the braking effect (damper effect) gradually increases. The mechanism by which the arm 71 of the brake lever 70 charges the brake spring 88 is as follows.
[0024]
Brake lever 70 Is a brake spring 88 Mechanism to charge
A pin 89 is fixed to the camera body. In other words, when the flash light emitting unit 10 pops up, the main body side fixing pin 89 relatively rotates (revolves) counterclockwise about the shaft 30 in FIG. The arm 81 of the pop-up interlocking lever 80 is in contact with the main body side fixing pin 89, and the pop-up interlocking lever 80 also moves relative to the flash light emitting unit. The brake drum 85 is formed on the pop-up interlocking lever 80.
On the other hand, a brake lever drive pin 82 passed through an elongated hole 75 formed in the brake lever 70 is fixed to the pop-up interlocking lever 80. Therefore, in FIG. 3, when the pop-up interlocking lever 80 relatively rotates counterclockwise, the brake lever drive pin 82 rotates the brake lever 70 clockwise about the shaft 70a, and as a result, the arm 71 charges the brake spring 88. As a result, the diameter of the coil portion 88a of the brake spring 88 is reduced, and the damper effect is achieved by tightening the brake drum 85 in the same manner as described above.
[0025]
As can be understood from the above description, in the examples of FIGS. 2 and 3, the initial movement is braked by the arm 53 charging the brake spring 88, and thereafter, the arm 71 charges the brake spring 88. The braking effect gradually increases. In this way, by balancing the braking effect of the brake drum, an appropriate damper effect can be obtained as a whole.
It is preferable that a stopper portion for finally positioning the flash light emitting portion at the use position is appropriately provided.
[0026]
Principle explanation using FIGS. 4 to 8
FIGS. 4 to 8 show each member from the state where the flash light emitting unit 10 having the mechanism shown in FIGS. 2 and 3 is in the storage position, pops up (rotates), and is located in the use position. FIG. 2 is a driving principle diagram schematically showing the function of FIG. Since FIGS. 2 and 3 are complicated, they will be described in principle using simplified FIGS. 4 to 8 correspond to the members shown in FIGS. 2 and 3.
In the following description with reference to FIGS. 4 to 8, it is as though the locking claw 21 and the main body side fixing pin 89 that are immovable with respect to the camera main body 20 move downward in the drawing. This is a relative relationship. Actually, the entire flash light emitting unit 10 is pivoted upward, and the locking claw 21 and the main body side fixing pin 89 are not moved.
Further, in FIGS. 2 and 3, the locking lever 60 is interposed between the rotating lever 50 and the locking claw 21, but such an interposition is provided in the driving principle diagrams of FIGS. The lever is omitted. This is because, in principle, the intervention of the locking lever 60 can be omitted, and the description becomes clear. However, there is a merit in interposing the locking lever 60, which will be described later.
[0027]
Description of FIG.
This shows a state before the SMA 40 is energized, and corresponds to the state of FIG. That is, the flash light emitting unit 10 is in the storage state.
[0028]
Description of FIG.
The state where the energization to the SMA 40 has been started is shown. The SMA 40 contracts due to heat generation, whereby the rotation lever 50 rotates, and the arm 62 separates from the locking claw 21. When the engagement between the arm 62 and the locking claw 21 is released, the entire flash light emitting unit 10 starts rotating (pop-up) by the urging force of a pop-up spring (not shown). 88 is charged to provide a braking effect (braking effect by the arm 53).
[0029]
Description of FIG.
When the entire flash light emitting unit 10 rotates, the main body side fixing pin 89 relatively rotates in the direction of the arrow, whereby the arm 71 charges the brake spring 88 to provide a braking effect (braking effect by the arm 71).
[0030]
Description of FIG.
The power supply to the SMA 40 is turned off, and the SMA 40 begins to radiate heat and expand. As a result, the rotating lever 50 starts rotating clockwise, and the “braking effect by the arm 53” decreases. However, during this time, the pop-up of the entire flash light emitting unit 10 progresses, so that the "braking effect by the arm 71" increases.
Note that the locking claw 21 is relatively far away from the flash light emitting unit 10 and does not appear in FIGS. 7 and 8.
[0031]
Description of FIG.
This corresponds to a state in which the pop-up operation is completed and the flash light emitting unit 10 is completely protruded above the camera body 20 (use position). The SMA 40 has extended and returned to the initial length, and the rotating lever 50 has also returned to the initial position. Further, the pin 89 has reached a lowermost position relative to the entire flash light emitting unit.
[0032]
Lock lever 60 Benefits of intervening
Here, the merits of interposing the locking lever 60 between the rotating lever 50 and the locking claw 21 in FIGS. 2 and 3 will be described.
FIG. 8 corresponds to a state in which the flash light emitting unit 10 is completely protruded out of the camera main body. Thereafter, when the flash light emitting unit is stored in the camera main body (for example, the upper surface of the flash light emitting unit 10 is Pressing the entire flash light emitting unit into the camera body 20), the arm 62 abuts against the locking claw 21 from above, and rotates the rotating lever 50 counterclockwise in FIG. Since the rotating lever 50 is urged clockwise toward the initial position (the position in FIG. 4), the arm 62 and the locking claw 21 are again engaged with each other. Can be stored in the camera body 20.
When this re-engagement is performed, an abnormal load acts on the SMA 40 unless the locking lever 60 is interposed (in the case of FIGS. 4 to 8). However, as shown in FIGS. 2 and 3, if the locking lever 60 is interposed, the rotating lever 50 does not move even if the interposed locking lever 60 rotates during the re-engagement. Therefore, it is possible to prevent an abnormal load from acting on the SMA 40, and it is possible to improve durability.
[0033]
In order to drive the rotation lever using the wire-shaped SMA, it is necessary to secure a certain length of the SMA itself. The arrangement of such an SMA in the camera body hinders downsizing of the camera. However, in the configuration shown in FIGS. A wire-shaped SMA is arranged to prevent the camera from becoming large.
In addition, by doing so, the distance between the SMA and the pop-up drive shaft can be shortened. Furthermore, compared to the case where a pop-up is realized by disposing a plunger in the camera body, the plunger is eliminated. Space saving can be realized by an amount corresponding to the arrangement of another mechanism.
[0034]
Second embodiment
A second embodiment of the present invention will be described with reference to FIGS. In this embodiment, a brake drum is omitted as compared with the first embodiment. As an alternative, a cam surface (braking surface) 155 is provided on a part of the rotary lever 150, and the tip portion (braking protrusion) 80a of the pop-up interlocking lever 80 is pressed against the cam surface 155 to achieve a damper effect. are doing. As compared with the first embodiment, there is an advantage that the damper effect can be achieved with a smaller number of members (the brake drum is omitted).
Since other basic principles are the same as those in the first embodiment, the different points will be mainly described.
[0035]
The rotating lever 150 is urged clockwise in the figure to the initial position shown in FIG. 9 by the spring 156. When energization of the SMA 40 is started from this state, the rotation lever 150 rotates in the counterclockwise direction (first direction), and as a result, the arm 162 is disengaged from the locking claw 21 and pop-up starts. (FIG. 10). When the pop-up starts, the body-side fixing pin 89 relatively rotates counterclockwise in the drawing, whereby the tip end (braking projection) 80a of the pop-up interlocking lever 80 is moved to the cam surface of the turning lever 150 (braking). Surface) 155 and the brake is applied (FIG. 11). At this time, the distal end portion 80a presses the rotating lever 150 in the clockwise direction (second direction).
[0036]
In FIG. 11, the power supply to the SMA 40 is turned off, but the SMA 40 has not yet expanded and is in a contracted state. Thereafter, the SMA 40 dissipates heat and gradually expands. On the other hand, the distal end portion 80a of the pop-up interlocking lever 80 presses the rotating lever 150 clockwise (second direction).
Therefore, two forces of the pressing force from the distal end portion 80a and the reaction force from the gradually extending SMA 40 act on the rotating lever 150, and the rotating lever 150 is rotated clockwise by the balance. Rotate. With this rotation, the distal end portion 80a of the pop-up interlocking lever 80 rotates counterclockwise while receiving a damper effect on the cam surface 155 formed on the rotation lever 150. In other words, the flash light emitting unit, which is the drive target unit, rotates toward the operating position while receiving the damper effect.
The pop-up operation is completed when the rotating lever 150 finally returns to the initial position shown in FIG. 9 (FIG. 12).
[0037]
Third embodiment
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, unlike the first and second embodiments, the driven object slides instead of rotating.
Further, in the first and second embodiments, the rotating lever itself is disposed in the rotating flash light emitting unit. However, in the third embodiment, the rotating shaft of the rotating lever 250 does not change its position. Then, the movable tray 280, which is the drive target, actually moves.
[0038]
The movable tray 280 slides linearly between the standby position in FIG. 13 and the operating position in FIG. Actually, a flash light-emitting unit may be attached to the movable tray 280 and popped up in a sliding manner, or may be linked with other appropriate driving targets.
[0039]
The movable tray 280 is connected to the fixed wall 270 via a spring 271. The spring 271 urges the movable tray 280 leftward in the figure. That is, the movable tray 280 is urged toward the operating position in FIG. 16, but is held at the standby position in FIG. 13 by the engagement of the locking lever 260 with the concave portion 281 formed on the upper surface of the movable tray. ing.
[0040]
On the other hand, the rotating lever 250 is urged clockwise in the figure to the initial position shown in FIG. 13 by the spring 256. When energization of the SMA 40 is started from this state, the SMA 40 contracts, so that the rotation lever 250 rotates counterclockwise (first direction). As a result, the locking lever 260 engaged with the third arm 253 moves upward, and the lever tip 260a is disengaged from the concave portion 281 formed on the upper surface of the movable tray (FIG. 14).
[0041]
When the distal end portion 260a of the locking lever 260 is separated from the concave portion 281, the movable tray 280 starts to slide leftward from the standby position in FIG. On the other hand, the second arm 252 of the rotation lever 250 enters the slide path of the movable tray 280 due to the rotation of the rotation lever 250 counterclockwise. As a result, the braking surface 251 provided on the second arm 252 comes into contact with the braking protrusion 283 formed on the upper surface of the movable tray to give a braking effect (FIG. 15).
[0042]
After the state shown in FIG. 15, the power supply to the SMA 40 is turned off, but the SMA 40 has not yet fully expanded and is in a contracted state. Thereafter, the SMA 40 dissipates heat and gradually expands. On the other hand, in the movable tray 280, the braking protrusion 283 abuts on the braking surface 251 of the rotating lever 250, thereby pressing the rotating lever 250 clockwise (second direction).
Therefore, two forces of the pressing force from the braking protrusion 283 and the reaction force from the gradually extending SMA 40 act on the rotating lever 250, and the rotating lever 250 is rotated clockwise by the balance. To rotate. With this rotation, the movable tray 280 slides toward the operating position while receiving the damper effect.
Finally, the protrusion 282 provided on the lower surface of the movable tray 280 comes into contact with the stopper wall 290, and the sliding operation is completed. At this time, the rotating lever 250 has returned to the initial position shown in FIG. 13 by the urging force of the spring 256 (FIG. 16).
[0043]
In the third embodiment, since the locking lever 260 is interposed between the third arm 253 of the rotating lever 250 and the concave portion 281 of the movable tray 280, the rotating lever 50 and the locking claw 21 in FIG. The same effect can be obtained as when the locking lever 60 is interposed therebetween. That is, when returning the movable tray 280 in the operating position to the standby position, it is possible to prevent an abnormal load from acting on the SMA 40 and improve the durability.
The locking lever 260 is urged by gravity or an appropriate urging means in a direction in which the engaging lever 260 is engaged with the recess 281.
[0044]
Fourth embodiment
A fourth embodiment of the present invention will be described with reference to FIGS. Similarly to the third embodiment, also in the fourth embodiment, the position of the rotation shaft of the rotation lever 350 does not change, and the rotation shaft 380 that is the drive target portion actually rotates.
[0045]
The rotation shaft 380 rotates between the standby position in FIG. 17 and the operation position in FIG. Actually, a flash light emitting unit may be attached to the rotating shaft 380 to pop up, or may be linked to another appropriate driving target.
[0046]
The rotating shaft 380 is urged in a counterclockwise direction toward the use position in FIG. 20 by a spring (not shown). However, in the stand-by position of FIG. 17, the third arm 353 of the turn lever 350 engages with the projection 382 provided on the peripheral surface of the turn shaft 380, whereby the turn shaft 380 is held at the stand-by position. Have been.
[0047]
On the other hand, the rotating lever 350 is urged clockwise in the figure to the initial position shown in FIG. 17 by the spring 356. When energization of the SMA 40 is started from this state, the SMA 40 contracts, so that the rotation lever 350 rotates counterclockwise (first direction). As a result, the third arm 353 of the rotating lever 350 is disengaged from the protrusion 382 on the peripheral surface of the rotating shaft, and the rotating shaft 380 starts rotating counterclockwise (FIG. 18).
[0048]
On the other hand, the second arm 352 of the rotation lever 350 moves closer to the rotation center 380a of the rotation shaft 380 due to the rotation of the rotation lever 350 in the counterclockwise direction. The rotating shaft 380 is provided with a cam (braking protrusion) 381 coaxially, and when the rotating shaft 380 rotates, the cam (braking protrusion) 381 becomes a braking surface provided on the approaching second arm 352. 351 to provide a braking effect (FIG. 19).
[0049]
In the state shown in FIG. 19, the power supply to the SMA 40 is turned off, but the SMA 40 has not yet expanded and is in a contracted state. Thereafter, the SMA 40 dissipates heat and gradually expands. On the other hand, the cam (braking protrusion) 381 contacts the braking surface 351 of the rotating lever 350, and presses the rotating lever 350 clockwise (second direction).
Therefore, two forces of the pressing force from the cam (braking protrusion) 381 and the reaction force from the gradually extending SMA 40 act on the rotating lever 350, and the balance between the two forces acts on the rotating lever 350. Rotates clockwise. With this rotation, the rotation shaft 380 rotates toward the operating position while receiving a damper effect.
Finally, the projection 382 provided on the peripheral surface of the rotation shaft 380 comes into contact with the stopper wall 390, and the rotation operation is completed. At this time, the rotating lever 350 has returned to the initial position shown in FIG. 17 by the urging force of the spring 356 (FIG. 20).
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a conventional pop-up mechanism.
FIG. 2 is a schematic vertical cross-sectional view illustrating a flash light emitting unit including a disengagement and damper mechanism according to the first embodiment of the present invention.
FIG. 3 is an enlarged view of a main part of the disengagement / damper mechanism shown in FIG. 2;
FIG. 4 is a driving principle diagram for explaining the principle of the mechanism shown in FIG. 3;
FIG. 5 is a driving principle diagram for explaining the principle of the mechanism shown in FIG. 3;
FIG. 6 is a driving principle diagram for explaining the principle of the mechanism shown in FIG. 3;
FIG. 7 is a driving principle diagram for explaining the principle of the mechanism shown in FIG. 3;
FIG. 8 is a driving principle diagram for explaining the principle of the mechanism of FIG. 3;
FIG. 9 is a driving principle diagram for explaining the principle of a disengagement / damper mechanism according to a second embodiment of the present invention.
FIG. 10 is a driving principle diagram for explaining the principle of the disengagement and damper mechanism according to the second embodiment of the present invention.
FIG. 11 is a driving principle diagram for explaining the principle of the disengagement and damper mechanism according to the second embodiment of the present invention.
FIG. 12 is a driving principle diagram for explaining the principle of the disengagement / damper mechanism according to the second embodiment of the present invention.
FIG. 13 is a driving principle diagram for explaining the principle of the disengagement / damper mechanism according to the third embodiment of the present invention.
FIG. 14 is a drive principle diagram for explaining the principle of an engagement release / damper mechanism according to a third embodiment of the present invention.
FIG. 15 is a driving principle diagram for explaining the principle of the disengagement / damper mechanism according to the third embodiment of the present invention.
FIG. 16 is a driving principle diagram for explaining the principle of an engagement release / damper mechanism according to a third embodiment of the present invention.
FIG. 17 is a driving principle diagram for explaining the principle of a disengagement / damper mechanism according to a fourth embodiment of the present invention.
FIG. 18 is a driving principle diagram for explaining the principle of an engagement release / damper mechanism according to a fourth embodiment of the present invention.
FIG. 19 is a drive principle diagram for explaining the principle of an engagement release / damper mechanism according to a fourth embodiment of the present invention.
FIG. 20 is a driving principle diagram for explaining the principle of an engagement release / damper mechanism according to a fourth embodiment of the present invention.
[Explanation of symbols]
10 flash unit
11 rotating lever
15mm light emitting surface
20mm camera body
21 locking claw
22mm lens barrel
30 ° hinge (rotary axis)
40 SMA (shape memory alloy)
41 fixed pin
50, 150, 250, 350 ° rotating lever
51, 61 1st arm
52, 62, 162, 252, 352 second arm
53, 253, 353 3rd arm
60, 260 ° locking lever
66,156,256,271,356、３spring
70 brake lever
71, 81 arm
75mm long hole
80 pop-up interlocking lever
85mm brake drum
88mm brake spring
89 Main body side fixing pin
155mm cam surface
251、351 braking surface
270 fixed wall
280 movable tray
281 concave
282, 382 stopper projection
283 braking projection
290, 390 ° stopper wall
380 ° rotation axis
381 cam

Claims (6)

A drive target unit that is movable between the standby position and the operation position, and is attached to the base unit in a state of being biased toward the operation position;
A rotating lever that engages the base portion and the drive target portion, and holds the drive target portion at the standby position against the urging force;
It is connected to the rotating lever, contracts when the temperature rises by being energized, and rotates the rotating lever, thereby releasing the engagement between the base portion and the drive target portion, and storing the wire-shaped shape memory. Alloy and
A brake drum that is held by the drive target portion and is configured by a coil spring formed by passing a cylindrical member through the coil portion;
A braking member that charges the coil spring in conjunction with the movement of the drive target portion to the operating position, and a disengagement and damper mechanism comprising:
When the rotating lever rotates due to the contraction of the shape memory alloy, the initial movement of the driven portion is braked by charging the coil spring,
Thereafter, the braking member moves the drive target portion to the operating position while giving a damper effect by a braking force generated by charging the coil spring. The rotating lever engages with the locking claw fixed to the driving target portion or the base portion via another rotating lever, thereby engaging the driving target portion and the base portion. The other rotating lever is urged in a direction to engage with the locking claw,
The disengagement and damper mechanism according to claim 1, wherein when the rotating lever is rotated due to contraction of the shape memory alloy, the intervening rotating lever is disengaged from the locking claw in conjunction with the rotation. The disengagement / damper mechanism according to claim 1 or 2, wherein the base portion is a camera body, and the drive target portion is a flash light emitting portion attached to the camera body so as to be able to pop up. A drive target unit that is movable between the standby position and the operation position, and is attached to the base unit in a state of being biased toward the operation position;
A rotating lever that engages the base portion and the drive target portion, and holds the drive target portion at the standby position against the urging force;
The wire is connected to the rotating lever, contracts when the temperature is increased by being energized, and causes the rotating lever to rotate in the first direction, thereby disengaging the base portion and the drive target portion. A shape memory alloy,
When the engagement is released and the driven object moves toward the operating position, the braking projection projecting from the driven object or the base presses against a braking surface formed on the rotating lever, and The movement of the driven part is braked by
The force by which the braking protrusion presses the rotating lever in the second direction opposite to the first direction is transmitted to the rotating lever from the shape memory alloy, which is gradually deenergized by being turned off. A disengagement and damper mechanism for moving a drive target portion to an operating position while giving a damper effect by a balance with a reaction force. The rotating lever engages with the locking claw fixed to the driving target portion or the base portion via another rotating lever, thereby engaging the driving target portion and the base portion. The other rotating lever is urged in a direction to engage with the locking claw,
The disengagement / damper mechanism according to claim 4, wherein when the rotating lever is rotated due to contraction of the shape memory alloy, the intervening rotating lever is disengaged from the locking claw in conjunction with the rotation. The disengagement / damper mechanism according to claim 4 or 5, wherein the base portion is a camera body, and the drive target portion is a flash light emitting portion attached to the camera body so as to be able to pop up.

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