JP5613071B2 - Holding device - Google Patents

Description

  The present invention relates to a holding device that holds the position of a moving unit that moves by a driving force generated when a drive member is energized.

  There is a voice coil motor (VCM) as a driving member that generates a driving force for moving the moving unit when energized. A driving member such as a voice coil motor does not generate a force for holding the position of the moving unit when power is not supplied. For this reason, when the user of the product in which the moving unit is used when the voice coil motor is not energized, the position of the moving unit is shifted due to gravity or the like. Therefore, when the moving unit is stopped, it is necessary to control the current flowing through the voice coil motor in order to maintain the position of the moving unit. Current control for maintaining the position of the moving unit increases the power consumption of the voice coil motor.

  Patent Document 1 discloses a camera shake correction apparatus including a moving unit in which an imaging unit is attached to a stage unit. In this camera shake correction device, the moving unit moves relative to the fixed member by the driving force generated when the voice coil motor is energized, and camera shake correction during imaging is performed. In the camera shake correction apparatus according to an embodiment of Patent Document 1, a friction generating unit is provided on the fixed member. The position of the moving unit is held by the frictional force generated between the stage unit and the friction generating unit. For this reason, the position of the moving unit can be maintained even when the voice coil motor is not energized. As described above, the friction generating unit is provided in the holding device that holds the position of the moving unit.

  In the camera shake correction apparatus according to another embodiment of Patent Document 1, the first magnet is fixed to the fixing member. Moreover, the 2nd magnet is being fixed to the stage part. The position of the moving unit is maintained by the attractive force between the first magnet and the second magnet. For this reason, the position of the moving unit can be maintained even when the voice coil motor is not energized. In this embodiment, the camera shake correction apparatus includes a restriction release coil. When the moving unit is moved relative to the fixed member, the restriction releasing coil is energized. By energizing the coil for releasing the regulation, an electromagnetic force is generated on the moving unit in the direction away from the fixed member. Due to this electromagnetic force, the attractive force between the first magnet and the second magnet is canceled out, and the moving unit becomes a fixed member without being affected by the attractive force between the first magnet and the second magnet. Move against. As described above, the first magnet, the second magnet, and the restriction release coil are provided in the holding device that holds the position of the moving unit.

JP 2010-171770 A

  In the embodiment in which a frictional force is generated between the stage part and the friction generation part of Patent Document 1, the stage part and the friction generation part are in contact with each other when the moving unit moves relative to the fixed member. . For this reason, noise is generated when the mobile unit moves. Further, since the stage unit and the friction generating unit are in contact with each other, a frictional force is generated between the stage unit and the friction generating unit even when the moving unit is moved. For this reason, it is necessary to increase the driving force for moving the moving unit. Therefore, the power consumption of the voice coil motor, which is a driving member, increases when the moving unit moves.

  In the embodiment in which an attractive force is generated between the first magnet and the second magnet of Patent Document 1, the electromagnetic force generated by energizing the restriction release coil causes a gap between the moving unit and the fixed member. The gravitation is negated. For this reason, the moving unit is not attracted to the fixed member when the moving unit is moved, and no holding force for holding the moving unit is generated. Therefore, it is not necessary to increase the power consumption of the voice coil motor when driving the voice coil motor which is a driving member. However, in order to generate an electromagnetic force that cancels the attractive force between the fixed member and the moving unit, it is necessary to always energize the coil for releasing the regulation of the holding device when the moving unit is moved. Therefore, the power consumption of the holding device itself increases.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to move and maintain the position of the moving unit without generating noise, and the drive member consumes electric power when the position of the moving unit is held. An object of the present invention is to provide a holding device that can reduce the power consumption of the drive member and the holding device itself when the moving unit is moved.

  In order to achieve the above object, according to an aspect of the present invention, there is provided a holding device that holds a position of a moving unit that moves by a driving force generated when a driving member is energized, the lever member and a moving direction of the moving unit. The lever member is moved in a first lever moving direction that is not parallel to the moving unit and a direction toward the moving unit, or a second lever moving direction that is opposite to the first lever moving direction. A lever driving unit that is connected to the lever member and holds the position of the moving unit by contacting the moving unit, and the holding unit has the first lever than the lever member. A first plate-like portion disposed on the moving direction side, movable in the first lever moving direction or the second lever moving direction, and A pin member attached to the lever member in a state incapable of moving in the direction perpendicular to the first lever moving direction and the second lever moving direction, and the first lever moving direction side from the first plate-like portion A first elastic member disposed on the lever member that absorbs the kinetic energy of the lever member when the lever member contacts the moving unit by moving the lever member in the first lever moving direction; Is disposed between the first elastic member that fixes the position of the moving unit, the first plate-like portion, and the lever member by contracting to a state where it does not contract, and from the first elastic member The kinetic energy of the lever member that is a hard second elastic member that has not been absorbed by the first elastic member after the first elastic member has contracted to the state where it does not contract any more. Providing a holding device, characterized in that it comprises a second elastic member that absorbs all.

  In this holding device, the lever driving unit has a case member and a first lead movement direction between the first lead position and the second lead position, or a direction opposite to the first lead movement direction. A core member attached to the case member in a state movable in the second core movement direction, wherein the lever member is moved in the first core movement direction to move the lever member in the first lever movement direction. And moving the lever member in the second core moving direction to energize the core member to move the lever member in the second lever moving direction, thereby energizing the first core position to the first core position. A first coil that generates a driving force for moving the core member in the direction of the core movement, and a driving force for moving the core member in the second core movement direction to the second core position by energization. A second coil for generating A first magnet that generates a first magnetic force to hold the core member at the first core position when the member moves in the first core movement direction to the first core position; A second magnet that generates a second magnetic force to hold the core member at the second core position when the member moves in the second core movement direction to the second core position. It is preferable. In this case, the lever drive unit includes a drive-side elastic member that, when the core member is positioned at the second core position, collides with the core member and absorbs all the kinetic energy of the core member. preferable.

  The holding unit includes: a first holding unit including the pin member, the first elastic member, and the second elastic member; the pin member; the first elastic member; And a second holding unit connected to the lever member at a position different from that of the first holding unit, wherein the first elastic member is connected to the first holding unit. And a second holding unit that contacts the moving unit at a different position. In this case, the first holding unit is located away from the second holding unit and at a position opposite to the second holding unit around the center of gravity of the moving unit. It is preferable that one elastic member contacts the moving unit.

  The holding device may hold the position of the moving unit that moves by the driving force of the voice coil motor.

  According to the present invention, the moving unit is moved and held without generating noise, the driving member does not consume power when the moving unit is held, and the driving member and the holding device are moved when the moving unit is moved. A holding device capable of reducing power consumption by itself can be provided.

The perspective view which shows the movement unit drive device which concerns on the 1st Embodiment of this invention. The perspective view which shows the movement unit drive device which concerns on 1st Embodiment in the state which abbreviate | omitted the upper side frame. The perspective view which shows the movement unit drive device which concerns on 1st Embodiment in the state which abbreviate | omitted the upper side frame and the movement unit. The front view which shows the movement unit drive device which concerns on 1st Embodiment. The perspective view explaining the electromagnetic force by the voice coil motor of the movement unit drive device concerning a 1st embodiment. Schematic explaining the movement state of the movement unit of the movement unit drive device concerning a 1st embodiment. The perspective view which shows the holding | maintenance apparatus which concerns on 1st Embodiment. The perspective view which shows the structure of the lever member of the holding | maintenance apparatus which concerns on 1st Embodiment, a 1st holding unit, and a 2nd holding unit. Schematic which shows operation | movement at the time of canceling | releasing position holding | maintenance of the movement unit of the lever member of the holding | maintenance apparatus which concerns on 1st Embodiment. Schematic which shows operation | movement at the time of hold | maintaining the position of the movement unit of the lever member of the holding | maintenance apparatus which concerns on 1st Embodiment. Schematic which shows the holding apparatus provided with only one elastic member between the lever member and the movement unit as a reference example. Schematic which shows the relationship between the movement amount of the lever member of the holding | maintenance apparatus which concerns on 1st Embodiment, and the contraction amount of a 1st elastic member and a 2nd elastic member. Schematic which shows the state where the core member of the solenoid of the holding device concerning a 1st embodiment is located in the 1st core position. Schematic which shows the state which the core member of the solenoid of the holding | maintenance apparatus which concerns on 1st Embodiment is located in a 2nd core position. The schematic diagram showing the state where the core member of the solenoid of the holding device concerning the modification of a 1st embodiment is located in the 2nd core position.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 to FIG. 4 are diagrams showing a moving unit driving apparatus 1 according to the present embodiment. As shown in FIGS. 1 to 4, the moving unit driving apparatus 1 includes an upper frame 3 and a lower frame 7 that is fixed to the upper frame 3 through fixing screws 5. A moving unit 10 is provided between the upper frame 3 and the lower frame 7. The moving unit 10 includes an image sensor 11 and a holding frame 13 to which the image sensor 11 is fixed. Balls 15 are provided between the upper frame 3 and the holding frame 13 and between the lower frame 7 and the holding frame 13. The moving unit 10 is supported by the ball 15 so as to be movable with respect to the upper frame 3 and the lower frame 7.

  The moving unit driving apparatus 1 includes four voice coil motors (VCM) 20A to 20D that are driving members that move the moving unit 10. Each of the voice coil motors 20 </ b> A to 20 </ b> D includes a coil (21 </ b> A to 21 </ b> D) fixed to the holding frame 13 and a permanent magnet (23 </ b> A to 23 </ b> D) fixed to the lower frame 7. The coils 21 </ b> A to 21 </ b> D are movable together with the image sensor 11 and the holding frame 13 and are part of the moving unit 10.

  As shown in FIG. 2, each of the coils 21A to 21D is connected to a corresponding VCM driver (25A to 25D). The VCM drivers 25A to 25D are connected to the VCM controller 27. The VCM controller 27 is connected to a system controller 29 that controls the entire mobile unit driving apparatus 1. The VCM controller 27 controls the energization state of each of the voice coil motors 20A to 20D and the direction and magnitude of the current flowing through each of the coils 21A to 21D.

  FIG. 5 is a diagram illustrating the principle of the voice coil motor 20A. As shown in FIG. 5, in the voice coil motor 20A, a magnetic field M is generated by the permanent magnet 23A. In this state, the current I1 is supplied to the coil 21A by the VCM controller 27. At this time, an electromagnetic force F1 that is a driving force for moving the moving unit 10 is generated according to the Fleming left-hand rule. On the other hand, the current I2 in the direction opposite to the current I1 is supplied to the coil 21A by the VCM controller 27. At this time, an electromagnetic force F2 that is a driving force is generated in a direction opposite to the electromagnetic force F1 according to the Fleming left-hand rule. The other voice coil motors 20B to 20D generate an electromagnetic force that is a driving force for moving the moving unit 10 in the same manner as the voice coil motor 20A.

  FIG. 6 is a diagram illustrating the moving state of the moving unit 10. As shown in FIG. 6, the moving unit 10 can move in the direction of the arrow X and the direction of the arrow Y with respect to the upper frame 3 and the lower frame 7 and can rotate in the direction of the arrow θ. . Here, electromagnetic force is generated in the direction of arrow X by voice coil motors 20A and 20B, and electromagnetic force is generated in the direction of arrow Y by voice coil motors 20C and 20D. The VCM controller 27 controls the magnitude of the current flowing through the coils 21A to 21D based on the position information of the coils 21A to 21D from the system controller 29. Thereby, the magnitude | size of the electromagnetic force of each voice coil motor 20A-20D can be adjusted in the state by which the rotation to the direction of arrow (theta) of the movement unit 10 is prevented. Further, the magnitude of the electromagnetic force of each of the voice coil motors 20A to 20D can be adjusted so that the moving unit 10 rotates in the direction of the arrow θ.

  FIG. 7 is a diagram illustrating the holding device 30 that holds the position of the moving unit 10. As shown in FIG. 7, the holding device 30 includes a substantially T-shaped lever member 31. The lever member 31 is connected to a solenoid 33 that is a lever driving unit. A first fixed frame 35 </ b> A is fixed to the lower frame 7. A second fixed frame 35B is fixed to the first fixed frame 35A. In addition, a substantially U-shaped third fixed frame 35C is fixed to the second fixed frame 35B. A solenoid 33 is attached to the third fixed frame 35C. The lever member 31 is coupled to the second fixed frame 35B via a support shaft 37. The lever member 31 is rotatable with respect to the second fixed frame 35B around the support shaft 37.

  A first holding unit 41 </ b> A and a second holding unit 41 </ b> B are connected to a portion of the lever member 31 opposite to the solenoid 33. The first holding unit 41A and the second holding unit 41B are connected to the lever member 31 at different positions with respect to each other. In the present embodiment, the first holding unit 41A is at a position away from the second holding unit 41B and at a position opposite to the second holding unit 41B around the center of gravity of the lever member 31. The lever member 31 is connected.

  FIG. 8 is a diagram illustrating the configuration of the lever member 31, the first holding unit 41A, and the second holding unit 41B. 9 and 10 are diagrams illustrating the moving state of the lever member 31. FIG. As shown in FIGS. 9 and 10, the lever member 31 rotates (moves) about the support shaft 37 when the solenoid 33 operates according to the principle described later. The lever member 31 is not parallel to the moving direction of the moving unit 10 (for example, the directions of arrows X and Y in FIG. 6), and is the first lever moving direction (FIG. 9 and FIG. 9) that is the direction toward the moving unit 10. 10 in the direction of the arrow A1) or the second lever movement direction (the direction of the arrow A2 in FIGS. 9 and 10) which is opposite to the first lever movement direction. In the present embodiment, the first lever moving direction and the second lever moving direction are substantially perpendicular to the moving direction of the moving unit 10.

  When the lever member 31 moves in the first lever moving direction, the first holding unit 41A and the second holding unit 41B come into contact with the moving unit 10. Then, the position of the moving unit 10 is held by the frictional force between the first holding unit 41A and the second holding unit 41B and the moving unit 10 (see FIG. 10).

  As shown in FIG. 8, the first holding unit 41 </ b> A includes a pin member 43 attached to the lever member 31. The pin member 43 includes a first plate-like portion 45 disposed on the first lever moving direction side from the lever member 31, and a second plate-like portion disposed on the second lever moving direction side from the lever member 31. 47 and a columnar portion 49 extending from the first plate-like portion 45 to the second plate-like portion 47. The pin member 43 is attached to the lever member 31 in a state where the columnar portion 49 is inserted into the hole-shaped portion 48 </ b> A of the lever member 31. The pin member 43 is movable in the first lever moving direction or the second lever moving direction, and is not movable in the direction perpendicular to the first lever moving direction and the second lever moving direction. The lever member 31 is attached.

  A first elastic member 51 is arranged on the first lever moving direction side of the first plate-like portion 45 of the pin member 43. A second elastic member 53 that is harder than the first elastic member 51 is disposed between the first plate-like portion 45 of the pin member 43 and the lever member 31. Since the second elastic member 53 is harder than the first elastic member 51, the kinetic energy that can be absorbed by the first elastic member 51 is larger. Further, a third elastic member 55 is disposed between the second plate-like portion 47 of the pin member 43 and the lever member 31.

  The principle of holding the position of the moving unit 10 by the first holding unit 41A will be described. As the lever member 31 moves in the first lever moving direction, the first elastic member 51 contacts the moving unit 10 in the first holding unit 41A. At this time, the first elastic member 51 is pressed against the moving unit 10 via the second elastic member 53 and the first plate 45 by the kinetic energy of the lever member 31. Then, the position of the moving unit 10 is held by the frictional force between the first elastic member 51 and the moving unit 10.

  Here, the first elastic member 51 is not provided with the second elastic member 53, and only one elastic member 57 is provided between the lever member 31 and the moving unit 10 as shown in FIG. 11 as a reference example. Consider the case where the position of the mobile unit 10 is held. In this case, the elastic member 57 contacts the moving unit 10 by the lever member 31 moving in the first lever moving direction. The elastic member 57 is pressed against the moving unit 10 by the kinetic energy of the lever member 31.

  At this time, the elastic member 57 absorbs the kinetic energy of the lever member 31 and contracts. Here, when the kinetic energy of the lever member 31 is small, the elastic member 57 does not contract to a state where it does not contract any more, and excess elastic energy remains. When the surplus elastic energy is surplus, the moving unit 10 is moved by the surplus elastic energy of the elastic member 57. On the other hand, when the kinetic energy of the lever member 31 is large, not all the kinetic energy is absorbed by the elastic member 57. That is, even when the elastic member 57 contracts to a state where it cannot contract any more, the kinetic energy of the lever member 31 is excessive. The excess kinetic energy generates noise, vibration, and the like.

  Therefore, in the configuration of FIG. 11, it is necessary to move the lever member 31 with an appropriate amount of kinetic energy in order to appropriately hold the position of the moving unit 10 without generating noise or the like. However, it is difficult to move the lever member 31 with an appropriate amount of kinetic energy in the actual design of the holding device 30.

  Therefore, in the present embodiment, the first elastic member 51 and the second elastic member 53 that is harder than the first elastic member 51 and has a large absorbable kinetic energy are provided. In the present embodiment, the lever member 31 is moved with a kinetic energy larger than the kinetic energy that can be absorbed by the first elastic member 51. The second elastic member 53 having a large absorbable kinetic energy absorbs all the kinetic energy of the lever member 31 that has not been absorbed by the first elastic member 51.

  FIG. 12 is a diagram illustrating the relationship between the amount of movement of the lever member 31 and the amount of contraction of the first elastic member 51 and the second elastic member 53. In FIG. 12, L indicates the amount of movement of the lever member 31 in the first lever moving direction from the state where the first elastic member 51 starts to contact the moving unit 10, and S <b> 1 indicates the first elastic member 51. The amount of contraction, S2, indicates the amount of contraction of the second elastic member 53.

  As shown in FIG. 12, when the first elastic member 51 is pressed against the moving unit, the first elastic member 51 and the second elastic member 53 absorb the kinetic energy of the lever member 31 and contract. . However, since the second elastic member 53 has a large kinetic energy that can be absorbed, the second elastic member 53 hardly contracts and only the first elastic member 51 contracts greatly. Then, the first elastic member 51 contracts until it no longer contracts, and the position of the moving unit 10 is fixed.

  Then, after the first elastic member 51 contracts to a state where it does not contract any more, only the second elastic member 53 contracts. The second elastic member 53 absorbs all the kinetic energy of the lever member 31 that has not been absorbed by the first elastic member 51. Thereby, generation | occurrence | production of a noise, a vibration, etc. is prevented. Such a configuration can be realized by designing the sum of the kinetic energy that can be absorbed by the first elastic member 51 and the kinetic energy that can be absorbed by the second elastic member 53 to be larger than the kinetic energy of the lever member 31. .

  However, when all the kinetic energy of the lever member 31 is absorbed by the second elastic member 53, the second elastic member 53 is not contracted to a state where it does not contract any more, and excess elastic energy remains. . Therefore, in the present embodiment, the pin member 43 is attached to the lever member 31 in a state in which the pin member 43 cannot be moved in the direction perpendicular to the first lever moving direction and the second lever moving direction, and the first elastic member 51 and A first plate-like portion 45 of the pin member 43 is disposed between the second elastic member 53 and the second elastic member 53. For this reason, the movement of the first elastic member 51 due to the remaining elastic energy of the second elastic member 53 is prevented.

That is, when the kinetic energy that can be absorbed by the first elastic member 51 is E1, and the kinetic energy that can be absorbed by the second elastic member 53 is E2,
E1 <E2 (1)
It becomes. The kinetic energy of the lever member 31 is assumed to be EL. Then, the kinetic energy absorbed by the second elastic member 53 when the first elastic member 51 contracts to a state where it no longer contracts and the second elastic member 53 starts to absorb the kinetic energy only. Is E'2,
E1 + E′2 <EL (2)
It becomes. Here, the kinetic energy E1 absorbed by the first elastic member 51 and the kinetic energy E ′ absorbed by the second elastic member 53 until the first elastic member 51 contracts to a state where it does not contract any more. 2 are the same,
E1 = E′2 (3)
It becomes. Therefore, from Equation (2) and Equation (3),
2E1 <EL (4)
The relationship holds. Further, since the sum of the kinetic energy E1 that can be absorbed by the first elastic member 51 and the kinetic energy E2 that can be absorbed by the second elastic member 53 is larger than the kinetic energy EL of the lever member 31,
EL <E1 + E2 (5)
The relationship holds.

Hereinafter, materials for forming the first elastic member 51 and the second elastic member 53 will be described. Examples of materials for forming the first elastic member 51 and the second elastic member 53 include nitrile rubber (NBR), polyethylene foam, urethane foam, and the like. Here, the friction coefficient of nitrile rubber is about 2 to 3, and the friction coefficient of polyethylene foam and urethane foam is about 0.7 to 1. Here, if the amount of force that holds the moving unit 10 is F3, the amount of force that the lever member 31 presses is F4, and the friction coefficient of the first elastic member 51 is μ,
F3 = μF4 (6)
It becomes. For this reason, as the friction coefficient μ of the first elastic member 51 is larger, the amount of force F3 for holding the moving unit 10 is larger.

  In addition, the first elastic member 51 and the second elastic member 53 may be deformed due to compressive strain due to long-term use of the holding device 30 and may not return to the original shape. As the first elastic member 51 and the second elastic member 53 are deformed, the kinetic energy that can be absorbed by the first elastic member 51 and the second elastic member 53 is reduced. Therefore, the relationship of the above formulas (1) to (5) does not hold. Here, as an example, when the nitrile rubber is contracted for a predetermined time with a predetermined amount of force under a predetermined temperature state and pressure state, the nitrile rubber is deformed to a state contracted by about 10% from the original shape due to compression strain, and the polyethylene foam The urethane foam is deformed to a state contracted by about 2% from the original shape due to compression strain.

  As described above, the material of the first elastic member 51 and the second elastic member 53 includes a material having a large friction coefficient but easily deformed by compressive strain, and a material having a small friction coefficient but hardly deformed by compressive strain. Selectable.

  By using different materials for the first elastic member 51 and the second elastic member 53 from the above materials, the second elastic member 53 can be absorbed by the kinetic energy E1 that can be absorbed by the first elastic member 51. The kinetic energy E2 is designed to be large. However, even when the same material is used for the first elastic member 51 and the second elastic member 53, the density, area, etc. of the material are changed between the first elastic member 51 and the second elastic member 53. Thus, the kinetic energy E2 that can be absorbed by the second elastic member 53 becomes larger than the kinetic energy E1 that can be absorbed by the first elastic member 51.

  For example, urethane foam is used as the material of the first elastic member 51 and the second elastic member 53. The density of the urethane foam changes by changing the ratio of air and material. For this reason, the urethane foam used for the first elastic member 51 and the second elastic member 53 can be selected from several types of urethane foam having a density of 15%, 20%, 40%, 50%, and the like. By making the density of the urethane foam used for the second elastic member 53 larger than the urethane foam used for the first elastic member 51, the second elastic member can be absorbed from the kinetic energy E1 that can be absorbed by the first elastic member 51. The kinetic energy E2 that 53 can absorb increases. In the same material, the kinetic energy that can be absorbed by the elastic members (51, 53) is increased by increasing the area of the material.

  As described above, the configuration of the first holding unit 41A and the principle of holding the position of the moving unit 10 by the first holding unit 41A have been described. However, the second holding unit 41B also includes the first holding unit 41A and the first holding unit 41A. It is the same. That is, the second holding unit 41B has the same configuration as the first holding unit 41A, and holds the position of the moving unit 10 in the same manner as the first holding unit 41A.

  In the present embodiment, the first holding unit 41A is connected to the lever member 31 at a position away from the second holding unit 41B. Thereby, a frictional force is generated between the moving unit 10 and the first holding unit 41 </ b> A and at two distant locations between the moving unit 10 and the second holding unit 41 </ b> B. Therefore, when the position of the moving unit 10 is held, the moving unit 10 is also prevented from rotating in the direction of the arrow θ in FIG. The first holding unit 41A preferably has the first elastic member 51 in contact with the moving unit 10 at a position opposite to the second holding unit 41B with the center of gravity of the moving unit 10 as the center. With such an arrangement, the rotation of the moving unit 10 is more effectively prevented.

  When releasing the position holding of the moving unit 10, the lever member 31 is moved in the second lever moving direction. Accordingly, the first holding unit 41A and the second holding unit 41B are not in contact with the moving unit 10. At this time, since the frictional force between the first holding unit 41A and the second holding unit 41B and the moving unit 10 is not generated, the position holding of the moving unit 10 is released (see FIG. 9). In this state, the moving unit 10 is moved.

  Here, in the first holding unit 41 </ b> A, the third elastic member 55 is disposed between the second plate-like portion 47 of the pin member 43 and the lever member 31. When the lever member 31 moves in the second lever moving direction when the position holding of the moving unit 10 is released, the third elastic member 55 absorbs all the kinetic energy of the lever member 31. Such a configuration is possible by designing the kinetic energy that can be absorbed by the third elastic member 55 to be larger than the kinetic energy of the lever member 31. Since all the kinetic energy of the lever member 31 is absorbed by the third elastic member 55, generation of noise, vibration and the like is prevented.

  In the second holding unit 41B as well as the first holding unit 41A, the kinetic energy of the lever member 31 is absorbed by the third elastic member 55 when the position holding of the moving unit 10 is released.

  13 and 14 are diagrams showing the solenoid 33. As shown in FIGS. 13 and 14, the solenoid 33 includes a case member 61 fixed to the third fixed frame 35C. A core member 63 such as an iron core is movably attached to the case member 61. The core member 63 has a first core movement direction parallel to the axis (the direction of the arrow C1 in FIG. 13) between the first core position shown in FIG. 13 and the second core position shown in FIG. The case member 61 can be moved in a second core moving direction (the direction of the arrow C2 in FIG. 14) that is opposite to the first core moving direction. The solenoid 33 is connected to the lever member 31 by a core member 63.

  A first coil 65 </ b> A is fixed to the inner peripheral surface of the case member 61. A second coil 65B is fixed to a portion of the inner peripheral surface of the case member 61 on the second core moving direction side from the first coil 65A. As shown in FIG. 2, the first coil 65 </ b> A and the second coil 65 </ b> B are connected to a solenoid driver 67. The solenoid driver 67 is connected to the solenoid controller 69. The solenoid controller 69 is connected to the system controller 29. The energization state of the first coil 65A and the second coil 65B is controlled by the solenoid controller 69.

  By energizing the first coil 61 </ b> A by the solenoid controller 69, an electromagnetic force that is a driving force for moving the core member 63 in the first core movement direction to the first core position is generated. When the core member 63 moves in the first core movement direction, the lever member 31 moves in the first lever movement direction. Then, the first holding unit 41A and the second holding unit 41B come into contact with the moving unit 10, and the position of the moving unit 10 is held by the first holding unit 41A and the second holding unit 41B.

  A first magnet 71 </ b> A is fixed to the inner peripheral surface of the case member 61 on the first core movement direction side. The first magnet 71A generates a first magnetic force that holds the core member 63 at the first core position when the core member 63 moves to the first core position in the first core movement direction. Since the core member 63 is held at the first core position by the first magnetic force of the first magnet 71A, when the core member 63 is held at the first core position, the first coil 65A and the first coil 65A There is no need to energize the second coil 65B. Therefore, the power consumption of the holding device 30 itself is reduced.

  Here, as shown in FIG. 13, when the core member 63 is held at the first core position, a gap is formed between the first magnet 71 </ b> A and the core member 63. That is, the first magnetic force of the first magnet 71A is designed to hold the core member 63 at the first core position having a gap with the first magnet 71A. By holding the core member 63 at the first core position with a gap between the first magnet 71A and the first magnet 71A, the core member 63 does not collide with the first magnet 71A. For this reason, generation | occurrence | production of a noise, a vibration, etc. is prevented. Further, the core member is brought into a state where the lever member 31 has an appropriate amount of force at the time of holding the position of the moving unit 10 that contracts the first elastic member 51 to a state where it does not contract any more, and further contracts the second elastic member 53. 63 is held at the first core position.

  When the core member 63 is moved from the first core position, the second coil 61B is energized by the solenoid controller 69, whereby the core member 63 is moved in the second core movement direction to the second core position. An electromagnetic force that is a driving force to be moved is generated. When the electromagnetic force generated by the second coil 61B is greater than the first magnetic force of the first magnet 71A, the core member 63 moves from the first core position in the second core movement direction. When the core member 63 moves in the second core movement direction, the lever member 31 moves in the second lever movement direction. Then, the first holding unit 41A and the second holding unit 41B are not in contact with the moving unit 10, and the position holding of the moving unit 10 by the first holding unit 41A and the second holding unit 41B is released.

  A second magnet 71B is fixed to the inner peripheral surface of the case member 61 on the second core movement direction side. The second magnet 71B generates a second magnetic force that holds the core member 63 at the second core position when the core member 63 moves in the second core movement direction to the second core position. Since the core member 63 is held at the second core position by the second magnetic force of the second magnet 71B, when the core member 63 is held at the second core position, the first coil 65A and the second coil There is no need to energize the second coil 65B. Therefore, the power consumption of the holding device 30 itself is reduced.

  In addition, a drive side elastic member 73 is provided between the core member 63 and the second magnet 71B. When the core member 63 is located at the second core position, the drive side elastic member 73 collides with the core member 63 and absorbs all the kinetic energy of the core member 63. Thereby, generation | occurrence | production of a noise, a vibration, etc. is prevented. Such a configuration is possible by designing the kinetic energy that can be absorbed by the drive-side elastic member 73 to be greater than the kinetic energy of the core member 63.

  In the present embodiment, the drive-side elastic member 73 is provided between the core member 63 and the second magnet 71B, but is not limited thereto. For example, as shown in FIG. 15 as a modification, a drive side elastic member 73 may be provided on the first core moving direction side of the case member 61. In this case, the core member 63 includes a protruding portion 75 protruding in the outer peripheral direction. When the core member 63 is positioned at the second core position, the protruding portion 75 of the core member 63 collides with the drive-side elastic member 73. The drive side elastic member 73 absorbs all the kinetic energy of the core member 63. Here, when the projecting portion 75 of the core member 63 collides with the drive-side elastic member 73, the movement of the core member 63 from the second core position toward the second core moving direction is restricted. In the present modification, when the core member 63 is located at the second core position, a gap is provided between the core member 63 and the second magnet 71B.

  When the core member 63 is moved from the second core position, the first coil 61A is energized by the solenoid controller 69, whereby the core member 63 is moved in the first core movement direction to the first core position. An electromagnetic force that is a driving force to be moved is generated. When the electromagnetic force by the first coil 61A becomes larger than the second magnetic force of the second magnet 71B, the core member 63 moves from the second core position in the first core moving direction. Then, as described above, the lever member 31 moves in the first lever moving direction, and the position of the moving unit 10 is held by the first holding unit 41A and the second holding unit 41B.

  As described above, in the solenoid 33 of the present embodiment, the core member 63 is held at the first core position by the first magnetic force of the first magnet 71A. Further, the core member 63 is held at the second core position by the second magnetic force of the second magnet 71B. For this reason, it is not necessary to energize the first coil 65A or the second coil 65B except when the core member 63 is moved between the first core position and the second core position. Therefore, the power consumption of the holding device 30 itself is reduced.

  Therefore, the holding device 30 of the moving unit 10 having the above configuration has the following effects. That is, in the holding device 30, the lever member 31 rotates (moves) when the solenoid 33 operates. When the lever member 31 moves in the first lever moving direction, the first elastic members 51 of the first holding unit 41A and the second holding unit 41B come into contact with the moving unit 10. Then, the position of the moving unit 10 is held by the frictional force between the first elastic member 51 of the first holding unit 41A and the second holding unit 41B and the moving unit 10. As described above, the voice coil motors 20A to 20D, which are driving members, can hold the position of the moving unit 10 without consuming electric power.

  In the holding device 30, the first holding unit 41 </ b> A and the second holding unit 41 </ b> B are not in contact with the moving unit 10 by moving the lever member 31 in the second lever moving direction. At this time, since the frictional force between the first holding unit 41A and the second holding unit 41B and the moving unit 10 is not generated, the position holding of the moving unit 10 is released. In this state, the moving unit 10 is moved. Since the movement unit 10 is moved in a state where the first holding unit 41A and the second holding unit 41B are not in contact with the movement unit 10, noise during movement of the movement unit 10 can be prevented. Moreover, the power consumption of the voice coil motors 20 </ b> A to 20 </ b> D during the movement of the moving unit 10 can be reduced.

  Further, in the first holding unit 41A and the second holding unit 41B of the holding device 30, the first elastic member 51 and the second elastic member that is harder than the first elastic member 51 and has a large absorbable kinetic energy. 53 is provided. When the position of the moving unit 10 is held, the lever member 31 is moved with a kinetic energy larger than the kinetic energy that can be absorbed by the first elastic member 51. The second elastic member 53 having a large absorbable kinetic energy absorbs all the kinetic energy of the lever member 31 that has not been absorbed by the first elastic member 51. When the position of the moving unit 10 is held, since the first elastic member 51 is contracted until it does not contract any more, the first elastic member 51 does not have surplus elastic energy. For this reason, the position of the moving unit 10 is firmly fixed. Further, the second elastic member 53 absorbs all of the kinetic energy of the lever member 31 that has not been absorbed by the first elastic member 51, thereby preventing the occurrence of noise, vibration, and the like. As described above, the position of the moving unit 10 can be reliably held without generating noise, vibration, or the like.

  In the first holding unit 41 </ b> A and the second holding unit 41 </ b> B of the holding device 30, when all the kinetic energy of the lever member 31 is absorbed by the second elastic member 53, the second elastic member 53 The above is not contracted to a state where it does not contract, and excess elastic energy remains. Therefore, in the holding device 30, the pin member 43 is attached to the lever member 31 in a state in which it cannot move in the direction perpendicular to the first lever moving direction and the second lever moving direction, and the first elastic member 51 and A first plate-like portion 45 of the pin member 43 is disposed between the second elastic member 53 and the second elastic member 53. For this reason, the movement of the first elastic member 51 due to the remaining elastic energy of the second elastic member 53 is prevented. Thereby, the position of the movement unit 10 can be held more reliably.

  Further, in the solenoid 33 of the holding device 30, the core member 63 is held at the first core position by the first magnetic force of the first magnet 71A. Further, the core member 63 is held at the second core position by the second magnetic force of the second magnet 71B. For this reason, it is not necessary to energize the first coil 65A or the second coil 65B except when the core member 63 is moved between the first core position and the second core position. Therefore, the power consumption of the holding device 30 itself can be reduced.

  The solenoid 33 of the holding device 30 is provided with a drive side elastic member 73. When the core member 63 is located at the second core position, the drive side elastic member 73 collides with the core member 63 and absorbs all the kinetic energy of the core member 63. Thereby, when the position holding of the moving unit 10 is released, it is possible to prevent the occurrence of noise, vibration, and the like in the solenoid 33 that is the lever driving unit.

  Further, in the solenoid 33 of the holding device 30, a gap is formed between the first magnet 71 </ b> A and the core member 63 when the core member 63 is held at the first core position. That is, the first magnetic force of the first magnet 71A is designed to hold the core member 63 at the first core position having a gap with the first magnet 71A. By holding the core member 63 at the first core position with a gap between the first magnet 71A and the first magnet 71A, the core member 63 does not collide with the first magnet 71A. For this reason, when the position of the moving unit 10 is held, it is possible to prevent the solenoid 33 from generating noise, vibration and the like.

  Further, in the first holding unit 41 </ b> A and the second holding unit 41 </ b> B of the holding device 30, the third elastic member 55 is disposed between the second plate-like portion 47 of the pin member 43 and the lever member 31. ing. When the lever member 31 moves in the second lever moving direction when the position holding of the moving unit 10 is released, the third elastic member 55 absorbs all the kinetic energy of the lever member 31. Since all the kinetic energy of the lever member 31 is absorbed by the third elastic member 55, generation of noise, vibration, and the like can be prevented when the position holding of the moving unit 10 is released.

  In the holding device 30, the first holding unit 41 </ b> A is connected to the lever member 31 at a position away from the second holding unit 41 </ b> B. Thereby, a frictional force is generated between the moving unit 10 and the first holding unit 41 </ b> A and at two distant locations between the moving unit 10 and the second holding unit 41 </ b> B. Therefore, when the position of the moving unit 10 is held, the moving unit 10 can be prevented from rotating in the direction of the arrow θ. In addition, the first holding unit 41A is in contact with the moving unit 10 at a position opposite to the second holding unit 41B with the center of gravity of the moving unit 10 as the center. Thereby, rotation of the movement unit 10 can be prevented more effectively.

(Other variations)
In the first embodiment, the moving unit 10 includes the imaging device 11 and the holding frame 13, but is not limited thereto. Any moving unit may be used as long as it is moved by a driving force generated when a driving member such as a voice coil motor (20A to 20D) is energized. For example, the moving unit (10) may include a lens and a lens frame that holds the lens. In this case, the focal length of the camera is adjusted by moving the moving unit (10).

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Moving unit drive device, 10 ... Moving unit, 30 ... Holding device, 31 ... Lever member, 33 ... Solenoid, 41A ... 1st holding unit, 41B ... 2nd holding unit, 43 ... Pin member, 45 ... 1st DESCRIPTION OF SYMBOLS 1 plate-shaped part, 51 ... 1st elastic member, 53 ... 2nd elastic member.

Claims (6)

A holding device that holds the position of the moving unit that moves by the driving force generated when the drive member is energized,
A lever member;
In a first lever moving direction that is not parallel to the moving direction of the moving unit and that is directed toward the moving unit, or in a second lever moving direction that is opposite to the first lever moving direction. A lever driving unit for moving the lever member;
A holding unit connected to the lever member and holding the position of the moving unit by contacting the moving unit;
Comprising
The holding unit is
A first plate-like portion disposed on the first lever movement direction side of the lever member; movable in the first lever movement direction or the second lever movement direction; and A pin member attached to the lever member in a state in which the lever member cannot move in a direction perpendicular to the lever moving direction and the second lever moving direction;
A first elastic member disposed closer to the first lever movement direction than the first plate-shaped portion, and is in contact with the movement unit by the movement of the lever member in the first lever movement direction; A first elastic member that fixes the position of the moving unit by absorbing the kinetic energy of the lever member and contracting to a state where it does not contract any more,
A second elastic member disposed between the first plate-like portion and the lever member and harder than the first elastic member, wherein the first elastic member does not contract any more A second elastic member that absorbs all of the kinetic energy of the lever member that was not absorbed by the first elastic member after contraction;
A holding device comprising: The lever drive unit is
A case member;
In a state of being movable in a first lead movement direction or a second lead movement direction opposite to the first lead movement direction between the first lead position and the second lead position. A core member attached to the case member, wherein the lever member is moved in the first lever movement direction by moving in the first core movement direction, and is moved in the second core movement direction. A core member for moving the lever member in the second lever moving direction;
A first coil that generates a driving force for moving the core member in the first core movement direction to the first core position by energization;
A second coil that generates a driving force to move the core member in the second core movement direction to the second core position by energization;
A first magnet that generates a first magnetic force for holding the core member at the first core position when the core member moves in the first core movement direction to the first core position;
A second magnet that generates a second magnetic force for holding the core member at the second core position when the core member moves in the second core movement direction to the second core position;
The holding device according to claim 1, further comprising:   The lever drive unit includes a drive-side elastic member that, when the core member is located at the second core position, collides with the core member and absorbs all the kinetic energy of the core member. The holding device according to claim 2. The holding unit is
A first holding unit comprising the pin member, the first elastic member, and the second elastic member;
A second holding unit that includes the pin member, the first elastic member, and the second elastic member, and is coupled to the lever member at a position different from the first holding unit; A second holding unit in which the first elastic member contacts the moving unit at a position different from the first holding unit;
The holding device according to claim 1, further comprising: The first holding unit is located away from the second holding unit and at a position opposite to the second holding unit with the center of gravity of the moving unit as a center. The holding device according to claim 4 , wherein a member contacts the moving unit. The holding device according to any one of claims 1 to 5 , wherein a position of the moving unit that moves by a driving force of a voice coil motor is held.

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