WO2009118791A1 - 駆動装置、レンズ駆動装置および機械装置 - Google Patents
駆動装置、レンズ駆動装置および機械装置 Download PDFInfo
- Publication number
- WO2009118791A1 WO2009118791A1 PCT/JP2008/000776 JP2008000776W WO2009118791A1 WO 2009118791 A1 WO2009118791 A1 WO 2009118791A1 JP 2008000776 W JP2008000776 W JP 2008000776W WO 2009118791 A1 WO2009118791 A1 WO 2009118791A1
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- WIPO (PCT)
- Prior art keywords
- arm
- shape memory
- memory alloy
- driven
- biasing
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
- F03G7/061—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like characterised by the actuating element
- F03G7/0614—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like characterised by the actuating element using shape memory elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
- F03G7/065—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like using a shape memory element
Definitions
- the present invention relates to a driving technique, and more particularly, to a driving device and a mechanical device that drive a lens of a digital camera mounted on a portable terminal.
- a digital camera requires a mechanism for driving a lens in order to focus the lens during shooting.
- the lens driving mechanism may be realized by a motor, a plunger, or the like.
- electromagnetic parts such as motors and plungers
- a lens driving technique using a shape memory alloy as a driving source without using an electromagnetic component see, for example, Patent Document 1).
- the present invention has been made in view of such circumstances, and a general purpose thereof is to provide a technique for miniaturizing a lens driving mechanism using a shape memory alloy as a driving source.
- a driving device that drives a driven member, and includes two arm members that are in contact with and gripped by the driven member, and two arm members.
- a first biasing member that biases the driven member in the first direction via one first arm member of the first arm member, and a first direction via the other second arm member of the two arm members.
- the second urging member for urging the driven member in a different second direction and the first arm member swinging to contract against the first urging member when contracted when a driving current is supplied.
- a shape memory alloy to be made.
- This device is a drive device that drives a driven member, and includes an arm member that contacts and supports the driven member, and a first bias that biases the driven member in the first direction via the arm member.
- the driven member is moved in the second direction by the second biasing member while maintaining contact with the arm member.
- Still another aspect of the present invention is a drive device.
- This device is a drive device that drives a driven member, and is in contact with and supported by the driven member, and a first biasing member that biases the driven member in the first direction, and a first direction
- a second urging member that urges the driven member in a different second direction, and a first urging member that contracts when a driving current is supplied and resists the urging force of the first urging member.
- a shape memory alloy that swings the member, and when the first biasing member swings, the driven member maintains the contact with the first biasing member while the second biasing member causes the second biasing member to maintain the second biasing member. Moved in the direction.
- the driven member may be moved in the first direction by the first urging member so as to resist the second urging member when the supply of the driving current to the shape memory alloy is stopped.
- the spring constant of the first biasing member may be set larger than the spring constant of the second biasing member.
- Still another aspect of the present invention is a lens driving device.
- the apparatus has a cylindrical holding member that holds the lens inside, a pair of first arm members that respectively contact the holding member, and a pair of first arm members, and the holding member in the first direction.
- a second biasing member that biases the holding member in a second direction different from the first direction, and contracts when a drive current is supplied to resist the first biasing member.
- a shape memory alloy that swings the pair of first arm members.
- the holding member When the pair of first arm members swings, the holding member is moved in the second direction by the second biasing member while maintaining the gripping state by the first arm member and the second arm member. Also good.
- the holding member may be moved in the first direction by the first urging member so as to resist the second urging member when the supply of the driving current to the shape memory alloy is stopped.
- the first arm member moves away from the holding member.
- the spring constant of the first biasing member may be set larger than the spring constant of the second biasing member.
- the holding member may include a plurality of first protrusions to be in contact with the first arm member or the second arm member and a plurality of second protrusions having a shape different from the first protrusion on the outer peripheral surface.
- the first arm member or the second arm member may have a first engagement portion and a second engagement portion having shapes corresponding to the first protrusion and the second protrusion, respectively.
- the first protrusion and the first engagement part may be slidably contacted, and the second protrusion and the second engagement part may be slidably contacted.
- Still another aspect of the present invention is a mechanical device.
- the mechanical device includes an optical device. This device is equipped with the above-described driving device or lens driving device.
- the driving mechanism of the lens protection device can be reduced in size.
- FIGS. 1A to 1C are diagrams for explaining the operation principle of the lens driving device according to the embodiment of the present invention.
- FIG. 2A is a perspective view showing an appearance of the lens driving device according to the embodiment of the present invention.
- FIG. 2B shows a configuration example of the frame body of FIG.
- FIG. 2C is a diagram illustrating a configuration example of the drive system in FIG.
- FIG. 3A is a top view of the lens driving device of FIG.
- FIG. 3B is a bottom view of the lens driving device of FIG.
- FIG. 3C is a first side view of the lens driving device of FIG.
- FIG. 3D is a second side view of the lens driving device of FIG.
- FIG. 4A is a first perspective view showing a configuration example of the first drive block of FIG.
- FIG. 4A is a first perspective view showing a configuration example of the first drive block of FIG. FIG.
- FIG. 4B is a second perspective view showing a configuration example of the first drive block of FIG.
- FIG. 5A is a first perspective view showing a configuration example of the second drive block of FIG.
- FIG. 5B is a second perspective view showing a configuration example of the second drive block of FIG.
- FIG. 6A is a top view showing the lens support member of FIG.
- FIG. 6B is a perspective view showing the lens support member of FIG.
- FIG. 6C is a first side view showing the lens support member of FIG.
- FIG. 6D is a second side view showing the lens support member of FIG.
- Fig.7 (a) is a perspective view which shows the structure except the 2nd drive block from the structure shown in FIG.2 (c).
- FIG. 7B is a perspective view showing the first drive block and the lens support member of FIG.
- FIG.7 (c) is the perspective view which showed FIG.7 (b) from another angle.
- FIG. 8A is a first perspective view showing the second drive block and the lens support member of FIG.
- FIG. 8B is a second perspective view showing the second drive block and the lens support member of FIG.
- FIG. 9A is a side view of FIG.
- FIG. 9B is a side view of FIG.
- FIG.9 (c) shows the enlarged view of the pressing part of FIG.9 (b).
- FIGS. 10A to 10C are views for explaining the operation principle of the lens driving device according to the modification of the embodiment of the present invention.
- the present embodiment relates to a lens driving device using a shape memory alloy as a driving source.
- a shape memory alloy is a linear material whose shape changes when a drive current is supplied. Since shape memory alloys are easy to process and do not take up space, they can be applied to lens drives for digital cameras mounted on small devices such as optical devices such as mobile phones. Become. Note that the drive device according to the present embodiment can also be applied as a drive mechanism of a mechanical device other than the optical device.
- Mobile phones are often operated with one hand, and may be accidentally dropped depending on the usage environment. In such a fall, a large force is applied to the lens barrel portion on which the lens is mounted. Therefore, when the shape memory alloy is directly connected to the lens barrel, unintentional acceleration is applied, and the shape memory alloy connected to the lens barrel is forcibly pulled. Deteriorates. In particular, if an unintended acceleration is applied when the shape memory alloy is contracting, the effect is further increased. Therefore, it is desirable to provide a mechanism for protecting the shape memory alloy from the acceleration generated at the time of dropping, and to reduce the size of the lens driving device.
- a small lens driving device can be realized with a simple configuration.
- FIGS. 1A to 1C are diagrams for explaining the operation principle of the lens driving device 100 according to the embodiment of the present invention.
- FIG. 1A shows an aspect of the lens driving device 100.
- the drive current is not supplied to the shape memory alloy 320, and the shape memory alloy 320 is in a state that does not sag. In this state, the tensile force of the shape memory alloy 320 and the resultant force of the first spring 340a and the second spring 340b are balanced (hereinafter referred to as a steady state) at the illustrated position.
- the spring constants of the first spring 340a and the second spring 340b are adjusted so that the lens support member 330 and the first arm portion 350a are not separated from each other.
- the shape memory alloy 320 is in a state that does not sag.
- tension is generated, and the above-described adjustment is performed.
- the lens driving device 100 includes a shape memory alloy 320, a lens support member 330, a first spring 340a, a second spring 340b, a first arm portion 350a, and a second arm portion 350b.
- Each of the shape memory alloy 320 and the first spring 340a has one end connected to the first arm portion 350a and the other end fixed.
- the second spring 340b has one end connected to the second arm portion 350b and the other end fixed.
- the lens support member 330 is not mechanically fixed to either the first arm part 350a or the second arm part 350b, and is held so as to be sandwiched between the first arm part 350a and the second arm part 350b. Is supported. Specifically, the first spring 340a biases the lens support member 330 in the direction of the first arrow 410 via the first arm portion 350a. The second spring 340b urges the lens support member 330 in the direction of the second arrow 420 via the second arm portion 350b against the urging of the first spring 340a. Here, the lens support member 330 stops at a position where the shape memory alloy 320 and the resultant force of the first spring 340a and the second spring 340b balance each other, and the first arm portion 350a and the second arm portion. Supported by 350b.
- FIG. 1B is a diagram illustrating an operation state of the lens driving device 100 when a driving current is supplied to the shape memory alloy 320.
- a drive current is supplied to the shape memory alloy 320
- the shape memory alloy 320 contracts in the direction of the third arrow 430.
- the first arm portion 350 a connected to the shape memory alloy 320 is pulled in the direction of the third arrow 430.
- the force pulled in the direction of the third arrow 430 acts to assist the force in the direction of the second arrow 420 by the second spring 340b.
- the balanced state of the spring force of the first spring 340a and the second spring 340b is broken from the steady state. Then, the lens support member 330 is moved in the direction of the third arrow 430 while resisting the spring force of the first spring 340a by the contraction force of the shape memory alloy 320 and the spring force of the second spring 340b.
- the lens support member 330 moves the shape memory alloy 320, the first spring 340a, and the second spring 340b to each other as shown in FIG. It moves to the position where the resultant force of the spring force is balanced.
- FIG. 1C is a diagram illustrating an operation state of the lens driving device 100 when an unintended acceleration is applied in the direction of the fourth arrow 440 due to, for example, the lens driving device 100 dropping.
- the mass M of the lens support member 330 on which the lens is mounted is extremely heavier than the masses m1 and m2 of the first arm portion 350a and the second arm portion 350b.
- the spring constant k1 of the first spring 340a is set to be larger than the spring constant k2 of the second spring 340b.
- the lens support member 330 works with the second arm portion 350 b while resisting the spring force of the second spring 340 b acting in the direction of the second arrow 420. It moves in the direction of 4 arrow 440.
- the first arm portion 350a also moves in the direction of the fourth arrow 440 in response to the acceleration in the direction of the fourth arrow 440.
- the mass m1 of the first arm portion 350a is lighter than the total mass (M + m2) of the lens, the lens support member 330, and the second arm portion 350b. Further, the lens support member 330 is not fixed. Therefore, the movement amount of the first arm portion 350a can be smaller than that of the lens support member 330 and the second arm portion 350b.
- the first arm portion 350a does not follow the movement of the lens support member 330.
- the shape memory alloy 320 extends due to the movement of the first arm portion 350a, the amount of movement of the first arm portion 350a is not large, so the shape memory alloy 320 does not extend excessively.
- the first arm portion 350a and the lens support member 330 are fixed, the first arm portion 350a follows the movement of the lens support member 330, so that the shape memory alloy 320 is excessively stretched.
- the force applied to the lens support member 330 is changed to a shape memory alloy. Transmission to 320 can be avoided.
- even if acceleration is applied in the direction opposite to the fourth arrow 440 the shape memory alloy 320 is contracted, and therefore there is no influence on the shape memory alloy 320.
- lens driving device 100 Next, a specific configuration and operation of the lens driving device 100 will be described with reference to the drawings. Hereinafter, (1) the overall appearance, (2) the detailed internal configuration, and (3) the operation mode of the lens driving device 100 will be described in order.
- FIG. 2A is a perspective view showing the appearance of the lens driving device 100 according to the embodiment of the present invention.
- the lens driving device 100 includes a first frame 10 a and a second frame 10 b represented by the frame body 10, first to fifth columns 22 a to 22 e represented by a column 22, and a drive system 200.
- FIG. 2B shows a configuration example of the frame 10 of FIG.
- the frame 10 accommodates the drive system 200 inside.
- the first frame 10 a and the second frame 10 b are fixed by a support 22.
- the support column 22 is installed at each corner of the frame body 10.
- the first column 22a and the second column 22b are installed at the same corner, and the other columns 22 are installed at different corners.
- FIG. 2 (c) is a diagram illustrating a configuration example of the drive system 200 of FIG. 2 (a).
- the drive system 200 includes a stopper 14, a first shape memory alloy 20a, a second shape memory alloy 20b, represented by a shape memory alloy 20, a lens support member 30, a first spring 40a, and a pair of first arms.
- the pair of first arm portion 50a and second arm portion 50b are referred to as lower arms.
- the pair of third arm portion 60a and fourth arm portion 60b is referred to as an upper arm.
- the shape memory alloy 20, the lens support member 30, the first spring 40a, the second spring 40b, the lower arm, and the upper arm shown in FIG. 2C are the shape memory alloys shown in FIGS. 320, the lens support member 330, the first spring 340a, the second spring 340b, the first arm portion 350a, and the second arm portion 350b.
- the first arm portion 50a includes a first shaft 52a and a first hook 54a.
- the second arm part 50b has the same configuration as the first arm part 50a.
- the third arm portion 60a includes a third shaft 62a.
- the 4th arm part 60b takes the same composition as the 3rd arm part 60a.
- Each arm part is installed in the frame 10 so that it can rock
- the set of the first spring 40a and the lower arm is referred to as a first drive block.
- a set of the second spring 40b and the upper arm is referred to as a second drive block.
- the first drive block has the same mode as the second drive block.
- the lens support member 30 is a cylindrical frame for holding the lens inside.
- the lens support member 30 is formed with a groove inside the cylinder so that the lens can be easily fitted, and is fixed after the lens is fitted.
- the lens support member 30 is not connected to either the lower arm or the upper arm, and is supported so as to be movable in the optical axis direction while being held by both arms.
- the first support 22a is connected to one end of the first shape memory alloy 20a.
- the first shape memory alloy 20 a is hooked to the first hook 54 a and the other end is connected to the stopper 14.
- the stopper 14 is connected to the first frame 10a.
- the first shape memory alloy 20a is supplied with a drive current from the first column 22a.
- the second shape memory alloy 20b is connected to the second support 22b and the stopper 14 at both ends while being hooked to the second hook 54b.
- the second shape memory alloy 20b is supplied with a drive current from the second column 22b.
- a state in which a drive current is supplied to the first shape memory alloy 20a and the second shape memory alloy 20b is referred to as a drive state.
- the first shape memory alloy 20a and the second shape memory alloy 20b in the driving state generate heat due to electric energy when energized, and generate shape recovery force as mechanical energy based on the thermal energy.
- FIG. 3A is a top view of the lens driving device 100 of FIG.
- FIG. 3B is a bottom view of the lens driving device 100 of FIG.
- FIG. 3C is a first side view of the lens driving device 100 of FIG.
- FIG. 3D is a second side view of the lens driving device 100 of FIG.
- the same components as those in FIGS. 2A and 2C are denoted by the same reference numerals.
- the first shaft 52a and the second shaft 52b of the lower arm and the third shaft 62a and the shaft 62 of the upper arm are rotatably supported by the frame body 10, respectively.
- FIG. 4A is a first perspective view showing a configuration example of the first drive block in FIG.
- FIG. 4B is a second perspective view showing a configuration example of the first drive block of FIG.
- the first arm portion 50a includes a semi-arc-shaped first tube support portion 72a and a first hook 54a.
- a first engagement portion 70a and a second engagement portion 70b are formed near both ends of the first tube support portion 72a.
- the second arm portion 50b has the same shape as the first arm portion 50a, and a second cylinder support portion 72b in which a second hook 54b, a third engagement portion 70c, and a fourth engagement portion 70d are formed. Including.
- the first engagement portion 70a and the third engagement portion 70c have shapes as shown in the figure, and the second engagement portion 70b and the fourth engagement portion 70d have semicircular recesses.
- the first engaging portion 70 a to the fourth engaging portion 70 d are portions that are in contact with the lens support member 30.
- the shape of the first spring 40a is substantially L-shaped as shown.
- the first spring 40a is an elastic body whose both ends are hooked by the first hook 54a and the second hook 54b and in contact with the first arm portion 50a and the second arm portion 50b.
- the first spring 40a biases the first arm portion 50a and the second arm portion 50b in the directions of the fifth arrow 450 and the sixth arrow 460.
- the first hook 54a and the second hook 54b are given forces in the directions of rotating in the directions of the seventh arrow 470 and the eighth arrow 480 about the first shaft 52a and the second shaft 52b, respectively.
- the first spring 40a may be mechanically fixed to the first hook 54a and the second hook 54b.
- FIG. 5A is a first perspective view showing a configuration example of the second drive block of FIG.
- FIG. 5B is a second perspective view showing a configuration example of the second drive block of FIG.
- Each of the third arm portion 60a and the fourth arm portion 60b includes a semi-arc-shaped third tube support portion 72c, a fourth tube support portion 72d, a third shaft 62a, and a fourth shaft 62b.
- a fifth engagement portion 70e and a sixth engagement portion 70f, and a seventh engagement portion 70g and an eighth engagement portion 70h are formed at both ends of the third tube support portion 72c and the fourth tube support portion 72d, respectively. Is done.
- the third arm part 60a and the fourth arm part 60b have substantially the same shape as the first arm part 50a and the second arm part 50b except for the configuration of the first hook 54a and the second hook 54b.
- the second drive block has the same mode as the first drive block described above, except for the direction in which the second drive block is installed on the lens support member 30.
- FIG. 6A is a top view showing the lens support member 30 of FIG.
- FIG. 6B is a perspective view showing the lens support member 30 of FIG.
- FIG. 6C is a first side view showing the lens support member 30 of FIG.
- FIG. 6D is a second side view showing the lens support member 30 of FIG.
- FIG. 6C and FIG. 6D not only the lens support member 30 but also the first spring 40a and the second spring 40b are shown in order to clarify the positional relationship between the protrusions 32. Yes.
- the lens support member 30 has eight protrusions 32, a first protrusion 32a to an eighth protrusion 32h.
- the eight protrusions 32 are configured in any one of two types of shapes.
- the eight protrusions 32 are arranged on the outer peripheral surface of the lens support member 30 so that the shapes of the adjacent protrusions 32 are different from each other.
- the protrusion 32 is slidably in contact with the engaging portion of either the lower arm or the upper arm. Although details will be described later, the lens support member 30 can be moved in the optical axis direction by sliding with the engaging portion by making the shapes of the adjacent protruding portions 32 different from each other.
- the first protrusion 32a, the third protrusion 32c, the sixth protrusion 32f, and the eighth protrusion 32h are formed in a rectangular parallelepiped shape.
- the 2nd projection part 32b, the 4th projection part 32d, the 5th projection part 32e, and the 7th projection part 32g are constituted by the shape which combined the rectangular parallelepiped and the semi-column.
- the direction of the semicircle is the same for the second protrusion 32b and the fourth protrusion 32d.
- the fifth protrusion 32e and the seventh protrusion 32g are also in the same direction. However, the fifth protrusion 32e and the seventh protrusion 32g are installed in directions opposite to the directions of the second protrusion 32b and the fourth protrusion 32d.
- the protrusions that come into contact with the hooks of the lower arm are the first protrusion part 32a to the fourth protrusion part 32d.
- the first protrusion 32a and the second protrusion 32b are in contact with the first engagement part 70a and the second engagement part 70b of the first arm part 50a, respectively.
- the third protrusion 32c and the fourth protrusion 32d are in contact with the third engagement part 70c and the fourth engagement part 70d of the second arm part 50b, respectively.
- the protrusions in contact with the hook portion of the upper arm are the fifth protrusion part 32e to the eighth protrusion part 32h.
- the fifth protrusion part 32e and the sixth protrusion part 32f are in contact with the fifth engagement part 70e and the sixth engagement part 70f of the third arm part 60a, respectively.
- the seventh projecting portion 32g and the eighth projecting portion 32h are in contact with the seventh engaging portion 70g and the eighth engaging portion 70h of the fourth arm portion 60b, respectively.
- movement aspect of the lens drive device 100 is divided into three cases of a steady state, a drive state, and the state where the acceleration was added in the steady state, and is demonstrated.
- an interlocking mode between the lens support member 30 and each drive block will be described in detail.
- FIG. 7A is a perspective view showing a configuration excluding the second drive block from the configuration shown in FIG.
- FIG. 7B is a perspective view showing the first drive block and the lens support member 30 of FIG.
- FIG.7 (c) is the perspective view which showed FIG.7 (b) from another angle.
- FIG. 8A is a first perspective view showing the second drive block and the lens support member 30 of FIG.
- FIG. 8B is a second perspective view showing the second drive block and the lens support member 30 of FIG.
- the third arm portion 60a is paired with the fourth arm portion 60b and supports the lens support member 30 so as to be movable in the optical axis direction.
- the second spring 40b biases the lens support member 30 via the third arm part 60a and the fourth arm part 60b.
- This bias causes a force to rotate in the directions of the eleventh arrow 510 and the twelfth arrow 520 around the third shaft 62a and the fourth shaft 62b. With these rotational forces, the second drive block presses the fifth protrusion 32e to the eighth protrusion 32h in a direction to move the lens support member 30 downward in the drawing.
- the first drive block and the second drive block are pressed against each other so as to move the lens support member 30 in opposite directions, and the resultant force of the shape memory alloy 20, the first spring 40a, and the second spring 40b. Are in equilibrium. As a result, in a steady state, the lens support member 30 is stationary at the position shown in FIG.
- FIG. 9A is a side view of FIG. 7B.
- FIG. 9B is a side view of FIG.
- the first shape memory alloy 20a and the second shape memory alloy 20b contract and resist the first spring 40a.
- the first hook 54 a and the second hook 54 b are urged in the directions of the ninth arrow 490 and the tenth arrow 500.
- the lower arm generates a force that rotates in the directions of the thirteenth arrow 530 and the fourteenth arrow 540 around the first shaft 52a and the second shaft 52b.
- the direction of the rotational force is opposite to the direction of the rotational force indicated by the seventh arrow 470 and the eighth arrow 480 in FIGS. 7A to 7C.
- the second spring 40b urges the upper arm, and rotational forces in the directions of the eleventh arrow 510 and the twelfth arrow 520 are generated.
- the fifth engaging portion 70e and the seventh engaging portion 70g of the upper arm are pressed against each other while rotating and sliding the fifth protruding portion 32e and the seventh protruding portion 32g of the lens support member 30.
- the sixth engaging portion 70f and the eighth engaging portion 70h of the upper arm are pressed against each other while sliding between the sixth protruding portion 32f and the eighth protruding portion 32h of the lens support member 30.
- the upper arm moves the lens support member 30 in the direction of the fifteenth arrow 550.
- the urging force by the first spring 40a is weakened by the shape memory alloy 20, and the rotational direction of the lower arm is displaced. Therefore, the balanced state of the first spring 40a and the second spring 40b is lost, and the rotational force in the directions of the eleventh arrow 510 and the twelfth arrow 520 due to the biasing force of the second spring 40b becomes dominant, and the lens support member 30 is Move in the direction of the fifteenth arrow 550.
- FIG. 9C shows an enlarged view of the pressing portion 600 of FIG. 9B.
- the eighth engaging portion 70h slides on the eighth protrusion 32h in the left direction in the drawing as compared with the state in FIG. 9B.
- the fifth protrusion 32e since the fifth protrusion 32e is in a mode in which the shape of the fifth protrusion 32e itself and the fifth engagement part 70e are smoothly meshed with each other, the fifth protrusion 32e rotates and slides.
- the eighth protrusion 32h has the same shape as the sixth protrusion 32f, and the eighth engagement part 70h of the fourth arm part 60b is a sixth (not shown) of the other end of the third arm part 60a.
- the shape is the same as that of the engaging portion 70f. Therefore, the third arm part 60a rotates and slides with the fifth protrusion part 32e at the fifth engagement part 70e at one end of the arm, and slides with the sixth protrusion part 32f at the sixth engagement part 70f at the other end. It will be.
- the shape is different from 32g.
- the seventh engaging portion 70g has the same shape as the fifth engaging portion 70e
- the seventh projecting portion 32g has the same shape as the fifth projecting portion 32e.
- the sixth protrusion 32f has the same shape as the eighth protrusion 32h. Therefore, the eighth protrusion 32h and the eighth engagement part 70h correspond to the relationship between the sixth protrusion 32f and the sixth engagement part 70f.
- the seventh protrusion 32g and the seventh engagement part 70g correspond to the relationship between the fifth protrusion 32e and the fifth engagement part 70e.
- the fourth arm portion 60b slides with the eighth projecting portion 32h at the eighth engaging portion 70h at one end of the arm, and the seventh engaging portion 70g at the other end (not shown). Thus, it will rotate and slide with the seventh protrusion 32g.
- all of the first engaging portion 70a to the eighth engaging portion 70h have a semicircular shape like the fifth engaging portion 70e, and the first protruding portion 32a to the eighth protruding portion 32h are formed.
- the shape is like the fifth protrusion 32e.
- all the sets of the engaging portion 70 and the protruding portion 32 become a set like the fifth engaging portion 70e and the fifth protruding portion 32e of FIG. 9C, and the eighth engaging portion 70h and There is no set like the eighth protrusion 32h.
- the first driving block In the driving state, the first driving block generates a rotational force in the directions of the thirteenth arrow 530 and the fourteenth arrow 540 due to the contraction of the shape memory alloy 20. Therefore, unlike the second drive block, the projection 32 of the lens support member 30 is not pressed against, but the first projection 32a to the fourth projection 32d and the first engagement portion 70a to the fourth engagement portion. 70d slides or rotates while being in contact with each other. As described above, the lens support member 30 is moved in the direction of the fifteenth arrow 550 by being biased by the second spring 40b while being gripped by the lower arm and the upper arm due to the interlocking between them.
- the shape memory alloy 20 when the supply of the drive current to the first shape memory alloy 20a and the second shape memory alloy 20b is stopped, the shape memory alloy 20, and the resultant force of the first spring 40a and the second spring 40b are balanced with each other
- the lens support member 30 moves in the direction of the sixteenth arrow 560 and shifts to a steady state.
- the first engaging portion 70a to the fourth engaging portion 70d and the first protruding portion 32a to the fourth protruding portion 32d are interlocked with each other. Since these interlocking modes are the same as the interlocking modes of the fifth protrusion part 32e to the fourth protrusion part 32d and the fifth engagement part 70e to the eighth engagement part 70h described above, description thereof will be omitted.
- the lower arm is also moved in the direction of the sixteenth arrow 560 by acceleration.
- the rotation of the thirteenth arrow 530 and the fourteenth arrow 540 reverses, and the first hook 54a moves in the direction opposite to the ninth arrow 490, and the second arrow
- the hook 54 b moves in the direction opposite to the tenth arrow 500. Since the first shape memory alloy 20a and the second shape memory alloy 20b are hooked to the first hook 54a and the second hook 54b, respectively, the first shape memory alloy 20a and the second shape memory alloy are moved by these movements. 20b will be pulled.
- the lower arm is lighter than the lens support member 30 on which the lens is mounted, is not connected to the lens support member 30, and the first spring 40a has a larger spring constant than the second spring 40b. . Therefore, the movement amount of the lower arm is smaller than the movement amount of the lens support member 30 and the upper arm. As a result, the lower arm and the lens support member 30 may be separated from each other. In any case, since the amount of movement of the lower arm is small, the acceleration can be prevented from being excessively transmitted to the first shape memory alloy 20a and the second shape memory alloy 20b, and the shape memory alloy 20 is not pulled excessively. And its performance does not deteriorate.
- the mass of the lower arm, the relationship between the lens support member 30 on which the lens is mounted and the mass of the upper arm, and the relationship between the spring constants of the first spring 40a and the second spring 40b are appropriately adjusted.
- the shape memory alloy 20 can be appropriately protected from unintended acceleration.
- a small lens protection device can be realized with a simple configuration.
- the lens drive device 100 By holding the lens support member 30 by covering the first drive block and the second drive block with each other, the lens drive device 100 can be reduced in size.
- the driving state by making the shapes of the two protrusions 32 to be in contact with one arm 60 different, the engagement part 70 of the arm 60 and the protrusion 32 of the lens support member 30 are locked. Can be avoided.
- FIGS. 10A to 10C are diagrams for explaining the operation principle of the lens driving device 700 according to the modification of the embodiment of the present invention.
- FIGS. 10A to 10C correspond to FIGS. 1A to 1C.
- the difference from the above-described embodiment is that a parallel link is used, there is only one arm, the shape memory alloy and the first spring are pulled in different directions, the first spring and the second spring.
- the spring is a tension spring.
- FIG. 10A is a diagram illustrating an operation state of the lens driving device 700 in a steady state.
- the lens driving device 700 includes a shape memory alloy 80, a first spring 82, a second spring 84, an arm 86, a lens support 88, a first parallel link 90a represented by a parallel link 90, and a second parallel link.
- a link 90b and a frame 98 are included.
- the shape memory alloy 80 has one end connected to the frame 98 and the other end connected to the arm 86.
- the first spring 82 has one end connected to the frame 98 and the other end connected to the arm 86.
- the first parallel link 90a is composed of two arms. The two arms have both ends pivoted on a frame 98 and an arm 86, and support the arm 86 so as to be swingable. Both ends of the arm 86 are connected to the shape memory alloy 80 and the first spring 82, respectively. The swing direction of the arm 86 is guided by the first parallel link 90a.
- the arm 86 has a first protrusion 92 and supports the lens support 88 in contact therewith.
- the second spring 84 has one end connected to the frame 98 and the other end connected to the lens support portion 88.
- the second parallel link 90b is composed of two arms. The two arms have both ends pivoted on the frame 98 and the lens support portion 88, and support the lens support portion 88 so as to be swingable.
- the lens support portion 88 is connected to the second spring 84.
- the lens support portion 88 is guided in the swinging direction by the second parallel link 90b.
- the lens support portion 88 has a second protrusion portion 94 and comes into contact with the first protrusion portion 92 of the arm 86 while being engaged therewith.
- the first spring 82 pulls the lens support portion 88 in the direction of the 17th arrow 870 through the arm 86.
- the second spring 84 pulls the lens support portion 88 in the direction of the eighteenth arrow 880 against the pulling of the first spring 340a. Therefore, the lens support portion 88 has a resultant force of the spring force of the shape memory alloy 80, the first spring 82, and the second spring 84 while the second protrusion 94 and the first protrusion 92 are engaged. Will be stationary at a position where they balance.
- FIG. 10B is a diagram showing an operation state of the lens driving device 100 in the driving state.
- the shape memory alloy 80 contracts in the direction of the 19th arrow 890.
- the arm 86 connected to the shape memory alloy 80 is pulled in the direction of the 19th arrow 890 and resists the biasing of the direction of the 17th arrow 870 by the first spring 82.
- the lens support portion 88 is moved in the direction of the 18th arrow 880 by the spring force of the second spring 84 while resisting the spring force of the first spring 82 and maintaining contact with the arm 86. It is done.
- the lens support portion 88 is positioned so that the spring forces of the first spring 82 and the second spring 84 balance each other, as shown in FIG. Move to.
- FIG. 10C is a diagram showing an operating state of the lens driving device 700 when an unintended acceleration is applied to the lens support portion 88 in the direction of the twentieth arrow 900 in a steady state.
- the lens support unit 88 resists the spring force of the second spring 84 acting in the direction of the eighteenth arrow 880, while the twentieth arrow. Move in the direction of 900.
- the arm 86 also receives the acceleration in the direction of the 20th arrow 900 and moves in the direction of the 20th arrow 900.
- the arm 86 is lighter than the lens support portion 88 and is not connected to the lens support portion 88, and the first spring 82 has a larger spring constant than the second spring 84. For this reason, the movement amount of the arm 86 may be smaller than the movement amount of the lens support portion 88. Accordingly, the arm 86 does not move following the lens support portion 88, and the shape memory alloy 80 is not pulled excessively.
- the arm 86 is lighter than the lens support portion 88, the spring constants of the first spring 82 and the second spring 84 are adjusted, and the arm 86 and the lens support portion 88 are not directly connected.
- the shape memory alloy 80 will loosen. This slackness hardly affects the shrinkage performance and life of the shape memory alloy 80 compared to being pulled too much.
- the first shape memory alloy 20a and the second shape memory alloy 20b have been described as separate shape memory alloys, but the present invention is not limited thereto.
- the first shape memory alloy 20a may be the second shape memory alloy. It may be integrated with 20b and configured as one shape memory alloy. In this case, both ends of the shape memory alloy may be connected to the first support column 22a and the second support column 22b and hooked to the first hook 54a, the stopper 14, and the second hook 54b. In this case, the number of parts can be reduced. It goes without saying that even in such an aspect, an effect equivalent to the effect described above can be achieved.
- the shape memory alloy 20 may have a bidirectional shape memory effect.
- Bi-directionality refers to the property of contracting when energized and returning to the original when energization is stopped.
- the lens can be continuously moved in the front-rear optical axis direction by controlling the supply of drive current.
- a control device that controls the supply of the drive current may be provided. Such an aspect enables smooth focus adjustment.
- the arm 86 has been described as being supported by the first parallel link 90a and the first spring 82, but this is not restrictive, and instead of the first parallel link 90a and the first spring 82, a leaf spring is used. It may be supported by an elastic body such as. Even with such a configuration, an effect equivalent to the effect described above can be obtained. Further, by using the leaf spring, a more space-saving design is possible, and the lens driving device can be further downsized. In addition, the number of parts can be reduced, and design and manufacture are facilitated.
- the lens driving mechanism of the camera can be reduced in size.
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Abstract
Description
m1<<M ・・式(1)
m2<<M ・・式(2)
k1>k2 ・・式(3)
図2(a)は、本発明の実施形態に係るレンズ駆動装置100の外観を示す斜視図である。レンズ駆動装置100は、枠体10で代表される第1枠10a、第2枠10bと、支柱22で代表される第1支柱22a~第5支柱22eと、駆動システム200とを含む。図2(b)は、図2(a)の枠体10の構成例を示す。
ここでは、レンズ駆動装置100の内部の詳細な構成について、第1駆動ブロック、第2駆動ブロック、および、レンズ支持部材30の3つの態様に分けて説明する。
図4(a)は、図2(c)の第1駆動ブロックの構成例を示す第1の斜視図である。図4(b)は、図2(c)の第1駆動ブロックの構成例を示す第2の斜視図である。第1アーム部50aは、半弧状の第1筒支持部72aと、第1フック54aとを含む構成である。第1筒支持部72aの両端付近には、第1係合部70aと第2係合部70bとが形成される。第2アーム部50bは、第1アーム部50aと同様の形状を有し、第2フック54bと、第3係合部70cと第4係合部70dとが形成された第2筒支持部72bとを含む。
図5(a)は、図2(c)の第2駆動ブロックの構成例を示す第1の斜視図である。図5(b)は、図2(c)の第2駆動ブロックの構成例を示す第2の斜視図である。第3アーム部60a、第4アーム部60bのそれぞれは、半弧状の第3筒支持部72c、第4筒支持部72dと第3軸62a、第4軸62bとを有する。
図6(a)は、図2(c)のレンズ支持部材30を示す上面図である。図6(b)は、図2(c)のレンズ支持部材30を示す斜視図である。図6(c)は、図2(c)のレンズ支持部材30を示す第1の側面図である。図6(d)は、図2(c)のレンズ支持部材30を示す第2の側面図である。図6(c)と図6(d)においては、それぞれの突起部32の位置関係を明瞭にするために、レンズ支持部材30だけでなく、第1バネ40aと第2バネ40bも図示している。
ここでは、レンズ駆動装置100の動作態様について、定常状態、駆動状態、および、定常状態において加速度が加わった状態の3つのケースに分けて、説明する。特に、レンズ支持部材30と各駆動ブロックとの連動態様について詳細に説明する。
図7(a)は、図2(c)に示す構成から、第2駆動ブロックを除いた構成を示す斜視図である。図7(b)は、図7(a)の第1駆動ブロックとレンズ支持部材30とを示す斜視図である。図7(c)は、図7(b)を別の角度から示した斜視図である。
(3-2)駆動状態における動作態様について
図9(a)は、図7(b)の側面図である。図9(b)は、図8(a)の側面図である。駆動状態において第1形状記憶合金20aと第2形状記憶合金20bとに駆動電流が供給されると、第1形状記憶合金20aと第2形状記憶合金20bは収縮して、第1バネ40aに抗するように、第1フック54aと第2フック54bを第9矢印490、第10矢印500の向きに付勢する。この付勢により、下アームは、第1軸52a、第2軸52bを軸として、第13矢印530、第14矢印540の向きに回転する力が生じる。この回転力の方向は、前述の図7(a)~(c)の第7矢印470、第8矢印480の回転力の方向と逆になる。
定常状態において加速度が加わった場合、前述の図1(c)と同様の動作態様となる。具体的に、図9(a)~(c)を用いて説明する。レンズ駆動装置100に対して、第16矢印560の向きに加速度が加わった場合、レンズ支持部材30は、第16矢印560の向きに移動する。この移動により、第5突起部32e~第8突起部32hが第5係合部70e~第8係合部70hを押接して、上アームが第16矢印560の向きに移動させられる。
Claims (15)
- 被駆動部材を駆動する駆動装置であって、
前記被駆動部材にそれぞれ接触して把持する2つのアーム部材と、
前記2つのアーム部材の一方の第1アーム部材を介して、前記被駆動部材を第1の方向に付勢する第1付勢部材と、
前記2つのアーム部材の他方の第2アーム部材を介して、前記第1の方向とは異なる第2の方向に前記被駆動部材を付勢する第2付勢部材と、
駆動電流が供給されると収縮して、前記第1付勢部材に抗するように、前記第1アーム部材を揺動させる形状記憶合金と、
を備え、
前記被駆動部材は、前記第1アーム部材が揺動すると、前記2つのアーム部材との接触を維持しながら、前記第2付勢部材により第2の方向に移動させられることを特徴とする駆動装置。 - 前記被駆動部材に対して、前記第2付勢部材に対抗する向きの加速度が加えられると、前記第1アーム部材は、前記被駆動部材と離れていくことを特徴とする請求項1に記載の駆動装置。
- 被駆動部材を駆動する駆動装置であって、
前記被駆動部材に接触して支持するアーム部材と、
前記被駆動部材を前記アーム部材を介して第1の方向に付勢する第1付勢部材と、
前記第1の方向とは異なる第2の方向に前記被駆動部材を付勢する第2付勢部材と、
駆動電流が供給されると収縮して、前記第1付勢部材に抗するように、前記アーム部材を揺動させる形状記憶合金と、
を備え、
前記被駆動部材は、前記アーム部材が揺動すると、前記アーム部材との接触を維持しながら、前記第2付勢部材により第2の方向に移動させられることを特徴とする駆動装置。 - 被駆動部材を駆動する駆動装置であって、
前記被駆動部材に接触して支持し、前記被駆動部材を第1の方向に付勢する第1付勢部材と、
前記第1の方向とは異なる第2の方向に前記被駆動部材を付勢する第2付勢部材と、
駆動電流が供給されると収縮して、前記第1付勢部材の付勢力に抗するように、前記第1付勢部材を揺動させる形状記憶合金と、
を備え、
前記被駆動部材は、前記第1付勢部材が揺動すると、前記第1付勢部材との接触を維持しながら、前記第2付勢部材により第2の方向に移動させられることを特徴とする駆動装置。 - 前記被駆動部材に対して、前記第2付勢部材に対抗する向きの加速度が加えられると、前記第1付勢部材は、前記被駆動部材と離れていくことを特徴とする請求項3または4に記載の駆動装置。
- 前記被駆動部材は、前記形状記憶合金への駆動電流の供給が停止されると、前記第2付勢部材に抗するように、前記第1付勢部材により第1の方向に移動させられることを特徴とする請求項1から5のいずれかに記載の駆動装置。
- 前記第1付勢部材のバネ定数は、前記第2付勢部材のバネ定数よりも大きく設定されていることを特徴とする請求項1から6のいずれかに記載の駆動装置。
- レンズを内側に保持する筒状の保持部材と、
前記保持部材にそれぞれ接触する1対の第1アーム部材と、
前記1対の第1アーム部材を介して、前記保持部材を第1の方向に付勢する第1付勢部材と、
前記保持部材にそれぞれ接触して、前記1対の第1アーム部材と共に、前記保持部材を把持する1対の第2アーム部材と、
前記1対の第2アーム部材を介して、前記第1の方向とは異なる第2の方向に、前記保持部材を付勢する第2付勢部材と、
駆動電流が供給されると収縮して、前記第1付勢部材に抗するように、前記1対の第1アーム部材を揺動させる形状記憶合金と、
を備えることを特徴とするレンズ駆動装置。 - 前記保持部材は、前記1対の第1アーム部材が揺動すると、前記第1アーム部材と前記第2アーム部材とによる把持状態を維持しながら、前記第2付勢部材により、前記第2の方向に移動させられることを特徴とする請求項8に記載のレンズ駆動装置。
- 前記保持部材は、前記形状記憶合金への駆動電流の供給が停止されると、前記第2付勢部材に抗するように、前記第1付勢部材により第1の方向に移動させられることを特徴とする請求項8または9に記載のレンズ駆動装置。
- 前記保持部材に対して、前記第2付勢部材に対抗する向きの加速度が加えられると、前記第1アーム部材は、前記保持部材と離れていくことを特徴とする請求項8から10のいずれかに記載のレンズ駆動装置。
- 前記第1付勢部材のバネ定数は、前記第2付勢部材のバネ定数よりも大きく設定されていることを特徴とする請求項8から11のいずれかに記載のレンズ駆動装置。
- 前記保持部材は、前記第1アーム部材もしくは前記第2アーム部材と接すべき複数の第1突起部と、前記第1突起部とは異なる形状を有する複数の第2突起部とを外周面に有し、
前記第1アーム部材もしくは前記第2アーム部材は、前記第1突起部と前記第2突起部に対応する形状をそれぞれ有する第1係合部と第2係合部を有することを特徴とする請求項8から12のいずれかに記載のレンズ駆動装置。 - 第1突起部と第1係合部は、回転摺動可能に接し、第2突起部と第2係合部は、摺動可能に接することを特徴とする請求項13に記載のレンズ駆動装置。
- 請求項1から7のいずれかに記載の駆動装置を搭載したことを特徴とする機械装置。
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KR1020107024016A KR101169876B1 (ko) | 2008-03-27 | 2008-03-27 | 구동 장치, 렌즈 구동 장치 및 기계 장치 |
JP2010505034A JP4971498B2 (ja) | 2008-03-27 | 2008-03-27 | 駆動装置、レンズ駆動装置および機械装置 |
US12/934,956 US8254044B2 (en) | 2008-03-27 | 2008-03-27 | Driving apparatus, lens driving apparatus, and mechanical apparatus |
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- 2008-03-27 US US12/934,956 patent/US8254044B2/en not_active Expired - Fee Related
- 2008-03-27 JP JP2010505034A patent/JP4971498B2/ja active Active
- 2008-03-27 KR KR1020107024016A patent/KR101169876B1/ko not_active IP Right Cessation
- 2008-03-27 WO PCT/JP2008/000776 patent/WO2009118791A1/ja active Application Filing
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2020518862A (ja) * | 2017-05-04 | 2020-06-25 | アクチュエーター・ソリュ—ションズ・ゲーエムベーハー | カメラモジュール型自動焦点アクチュエータ |
JP7001713B2 (ja) | 2017-05-04 | 2022-01-20 | アクチュエーター・ソリュ―ションズ・ゲーエムベーハー | カメラモジュール型自動焦点アクチュエータ |
Also Published As
Publication number | Publication date |
---|---|
KR101169876B1 (ko) | 2012-08-03 |
JPWO2009118791A1 (ja) | 2011-07-21 |
KR20100126840A (ko) | 2010-12-02 |
US20110019293A1 (en) | 2011-01-27 |
JP4971498B2 (ja) | 2012-07-11 |
US8254044B2 (en) | 2012-08-28 |
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