Actuator and optical unit
By designing the gimbal mechanism of the actuator so that the legs of the rotating part extend in the direction of the optical axis and engage with the supporting parts to support the rotational state, the problem of enlargement of the actuator and optical unit is solved and miniaturization is achieved. and high rigidity.
Patent Information
- Application Number
- CN202410970179.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-07-20
- Filing Date
- 2024-07-19
- Publication Date
- 2025-01-21
AI Technical Summary
In the case where a large lens unit is required to be connected to the actuator, the universal mechanism needs to be highly rigid to maintain the rotating state of the movable body, but this tends to result in larger sizes of the actuator and optical units.
An actuator is designed. Its gimbal mechanism has a rotating component and a supporting part. The foot of the rotating component extends along the direction of the optical axis and is engaged by the supporting part to support the rotating state of the foot. Specifically, it includes a first foot. The second leg protrudes toward the inside of the top plate and the second leg protrudes toward the outside of the top plate.
Through this structure, the gimbal mechanism can be miniaturized, thereby miniaturizing the actuator and optical unit, maintaining high rigidity while avoiding enlargement.
Smart Images
Figure CN119335793A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an actuator and an optical unit. Background Art
[0002] In the past, various optical units have been used. Among them, an optical unit including a lens unit, a sensor unit, and an actuator that can connect the lens unit and the sensor unit is used. For example, Patent Document 1 discloses an optical unit including: a movable body having an imaging module provided with a lens and an imaging element; and a fixed body that holds the movable body in a state where it can rotate with a direction intersecting the optical axis direction as a rotation axis. Prior art literature Patent Literature
[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-21332 Summary of the invention Problems to be solved by the invention
[0004] In an existing optical unit having a lens unit, a sensor unit, and an actuator that can connect the lens unit and the sensor unit, a large lens unit must be connected to the actuator in some cases, depending on the intended use. In the case where a large lens unit must be connected to the actuator, a gimbal mechanism for maintaining a movable body in a state where it can rotate relative to a fixed body must have high rigidity. In order to make the gimbal mechanism have high rigidity, it is conceivable to extend the legs constituting the gimbal mechanism in a direction intersecting the optical axis direction, and to press the legs to be mounted on the supporting parts of the movable body and the fixed body. However, if such a structure is adopted, the gimbal mechanism becomes larger in the direction intersecting the optical axis direction, and the actuator is easily enlarged, and the optical unit is easily enlarged. Technical solutions to solve problems
[0005] The actuator of the present invention is capable of connecting a lens unit and a sensor unit, and comprises: a movable body, which connects the lens unit and the sensor unit; a fixed body, which maintains the movable body in a state where it can rotate with at least one of the intersecting directions intersecting the optical axis direction as a rotation axis; and a gimbal mechanism, which comprises a rotating component and a supporting portion, the rotating component having a frame-shaped top plate passing through the movable body and a plurality of legs extending from the top plate in the optical axis direction, the supporting portion engaging with the legs and supporting the legs in a state where they can rotate, and the rotating component, as the legs, comprises: a first leg, which protrudes in the inner direction of the top plate and then extends in the optical axis direction; and a second leg, which protrudes in the outer direction of the top plate and then extends in the optical axis direction. Effects of the Invention
[0006] According to the present invention, it is possible to miniaturize an actuator capable of connecting a lens unit and a sensor unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 is a perspective view of an optical unit according to an embodiment of the present invention. Figure 2 Yes means Figure 1 An exploded perspective view of a lens unit, a sensor unit, and an actuator of an optical unit. Figure 3 Yes means Figure 1 Front view of the actuator of the optical unit. Figure 4 Yes means Figure 1 A front view of the movable body of the actuator of the optical unit. Figure 5 Yes means Figure 1 Front view of the fixed body of the actuator of the optical unit. Figure 6 Yes means Figure 1 A perspective view of the movable body and gimbal mechanism of the actuator of the optical unit. Figure 7 is along Figure 3 The cross-sectional view taken along line AA shows Figure 1 The movable body and gimbal mechanism of the actuator of the optical unit. Figure 8 is along Figure 3 The cross-sectional view taken along line BB shows Figure 1 A fixed body, a movable body and a gimbal mechanism of an actuator of an optical unit. Fig. 9 Yes means Figure 1 A sectional view of an actuator of an optical unit as viewed from the front. DETAILED DESCRIPTION
[0008] Below, use Figures 1 to 9 An optical unit 1 according to an embodiment of the present invention is described. In each figure, the Z-axis direction is the optical axis direction in which the optical axis AX extends, the X-axis direction is the direction intersecting the optical axis AX, in other words, the yaw axis direction, and the Y-axis direction is the direction intersecting the optical axis AX, in other words, the pitch axis direction. In addition, the direction pointed by the arrow in the Z-axis direction, i.e., the +Z direction, is the direction on the subject side, and the direction opposite to the direction pointed by the arrow, i.e., the -Z direction, is the direction on the opposite side of the subject, which is the side opposite to the subject side.
[0009] <Overall Structure of Optical Unit> First, the overall structure of the optical unit 1 of this embodiment will be described. Figure 1 As shown in FIG. 1 , the optical unit 1 of this embodiment includes a housing 2. Figure 1 As shown, a lens unit 3 having a lens 3 a is arranged on the housing 2 .
[0010] In addition, on the housing 2, in addition to the lens unit 3, Figure 2 As shown, an actuator 10 and a sensor unit 4 are also provided. Figure 1 As shown, a hole 2a is provided on the housing 2, and the lens unit 3 is arranged on the housing 2 in such a way that the lens 3a can be seen from the hole 2a when viewed from the optical axis direction. The actuator 10 connects the lens unit 3 and the sensor unit 4, and is configured to displace the lens unit 3 in the housing 2.
[0011] <Lens unit> The lens unit 3 of this embodiment is connected to the actuator 10, and in the state of being connected to the actuator 10, is also connected to the sensor unit 4. Figure 2 As shown, the lens unit 3 of this embodiment has: a lens setting portion 31 where the lens 3a is set; and a first connection portion 32 having a smaller diameter than the lens setting portion 31. The first connection portion 32 is connected to the actuator 10 and is also connected to the sensor unit 4.
[0012] <Sensor Unit> The sensor unit 4 of this embodiment includes: a large diameter portion 41 having an imaging element 41a; and a second connection portion 42 connected to the first connection portion 32. Here, the first connection portion 32 is cylindrical, and the second connection portion 42 is also cylindrical. And, in a state where the first connection portion 32 is connected to the actuator 10, the outer peripheral portion of the first connection portion 32 is embedded in the inner peripheral portion of the second connection portion 42, so that the first connection portion 32 and the second connection portion 42 are connected. The imaging element 41a is connected to the flexible substrate 41b.
[0013] <Actuator> like Figure 2 As shown in FIG. 1 and FIG. 2 , the actuator 10 of the present embodiment includes: a fixed body 110 fixed to the housing 2; and a movable body 120 connected to the lens unit 3 and the sensor unit 4 and capable of displacement relative to the fixed body 110. Figures 6 to 8 As shown in FIGS. 1 and 10 , the actuator 10 of the present embodiment includes a gimbal mechanism 130 connected to a fixed body 110 and a movable body 120 .
[0014] The fixed body 110 holds the movable body 120 in a state where it can rotate with at least one of the directions intersecting the optical axis direction, such as the X-axis direction and the Y-axis direction, as the rotation axis through the gimbal mechanism 130. Fig. 9As shown in FIG. 1 and FIG. 2 , the actuator 10 of the present embodiment includes a drive mechanism 140 including a magnet 141, a coil 142, and a flexible substrate 143, and generates a driving force for rotating the movable body 120 relative to the fixed body 110. In addition, as the flexible substrate 143, there are a flexible substrate 143A, a flexible substrate 143B, and a flexible substrate 143C that connect the coils 142 to each other, or ... Figure 2 Flexible substrate 143D etc. connected to terminal 144 as shown.
[0015] <Movable body> like Figure 3 , Figure 4 , Figure 6 and Fig. 9 As shown, the movable body 120 has: a first surface 121 and a second surface 122 which are parallel to the optical axis direction (Z-axis direction) and are opposite to each other; and a third surface 123 and a fourth surface 124 which are parallel to the optical axis direction, orthogonal to the first surface 121 and the second surface 122 and are opposite to each other. In addition, a magnet 141A as the magnet 141 is provided on the first surface 121, a magnet 141C as the magnet 141 is provided on the second surface 122, a magnet 141B as the magnet 141 is provided on the third surface 123, and a magnet 141D as the magnet 141 is provided on the fourth surface 124.
[0016] In addition, if Figure 7 and Figure 8 As shown, the movable body 120 has: a first insertion port 125, which can insert the first connection part 32 from a first direction in the optical axis direction (a direction from the +Z direction side toward the -Z direction side); and a second insertion port 126, which can insert the second connection part 42 from a second direction opposite to the first direction (a direction from the -Z direction side toward the +Z direction side). By displacing the movable body 120 to which the lens unit 3 and the sensor unit 4 are connected relative to the fixed body 110, the lens unit 3 and the sensor unit 4 are also displaced relative to the fixed body 110.
[0017] <Fixed body> like Figure 3 , Figure 5 and Fig. 9 As shown, the fixed body 110 has: a first opposite surface 111 facing the first surface 121; a second opposite surface 112 facing the second surface 122; a third opposite surface 113 facing the third surface 123; and a fourth opposite surface 114 facing the fourth surface 124. Figure 3 , Figure 8 and Fig. 9 As shown in FIG. 1 , the movable body 120 is disposed in a region surrounded by the first opposing surface 111, the second opposing surface 112, the third opposing surface 113, and the fourth opposing surface 114 of the fixed body 110. Fig. 9As shown, a coil 142A is provided as the coil 142 on the first relative surface 111, a coil 142C is provided as the coil 142 on the second relative surface 112, a coil 142B is provided as the coil 142 on the third relative surface 113, and a coil 142D is provided as the coil 142 on the fourth relative surface 114.
[0018] In addition, if Figure 8 As shown, the fixed body 110 is provided with a flexible substrate arrangement groove 115 which is recessed inwardly when viewed from the optical axis direction and is used to arrange the flexible substrate 143 along. By providing the flexible substrate arrangement groove 115, it is possible to suppress the situation where the flexible substrate 143 moves when the movable body 120 is displaced relative to the fixed body 110 and the flexible substrate 143 interferes with the movable body 120, etc.
[0019] <Gimbal Mechanism> like Figures 6 to 9 As shown, the gimbal mechanism 130 includes: a rotating member 136 having a frame-shaped top plate 131 passing through the movable body 120 and four legs 132 extending from the top plate 131 in the optical axis direction; and a support portion 134 engaged with the legs 132 to support the legs 132 in a rotatable state. Here, the rotating member 136 includes: Figure 6 and Figure 7 As shown in FIG. 1 , the first leg portions 132A and 132B protrude inwardly from the top plate 131 and extend along the optical axis direction; and Figure 6 and Figure 8 As shown in FIG. 1 , the second leg portions 132C and 132D protrude outward from the top plate 131 and extend along the optical axis. Figure 7 As shown in FIG. 1 , the first support portions 134A and 134B are fixed to the movable body 120 and support the first leg portions 132A and 132B in a rotatable state; and Figure 8 As shown, the second support parts 134C and 134D are fixed to the fixed body 110 and support the second leg parts 132C and 132D in a rotatable state.
[0020] That is, the support portion 134 is provided on a first straight line ( Figure 3 and a second straight line ( BB line) extending from a position between the first surface 121 and the fourth surface 124 to a position between the second surface 122 and the third surface 123 as viewed from the optical axis. Figure 3 Two locations on the movable body 120 on the extension line of the AA straight line. Figure 7and Figure 8 As shown in the figure, each support part 134 has the same structure, and is in a U-shape in which an engaging part 134a having a concave part 135 engaged with a convex part 133 provided on each leg part 132 and a fixed part 134b fixed to the fixed body 110 or the movable body 120 face each other, and the gimbal mechanism 130 supports the rotating member 136 by the elastic force of the U-shaped support part 134, and holds the movable body 120 so as to be rotatable relative to the fixed body 110. That is, the gimbal mechanism 130 of this embodiment is composed of the top plate 131 and the rotating member 136 of the leg part 132 having high rigidity, and the support part 134 having a U-shape and being easily bent.
[0021] <Drive Mechanism> The driving mechanism 140 of this embodiment includes: a magnet 141A and a coil 142A disposed at a position opposite to the magnet 141A; a magnet 141B and a coil 142B disposed at a position opposite to the magnet 141B; a magnet 141C and a coil 142C disposed at a position opposite to the magnet 141C; and a magnet 141D and a coil 142D disposed at a position opposite to the magnet 141D. Here, the magnet 141A, the magnet 141B, the magnet 141C, and the magnet 141D have the same structure, and the coil 142A, the coil 142B, the coil 142C, and the coil 142D have the same structure. Among them, the magnet 141A and the coil 142A, the magnet 141C and the coil 142C constitute a pitch axis swing mechanism. In addition, the magnet 141B and the coil 142B, the magnet 141D and the coil 142D constitute a yaw axis swing mechanism.
[0022] Hereinafter, the optical unit 1 of the present embodiment will be described in general terms from the perspective of the actuator 10. The actuator 10 of the present embodiment can connect the lens unit 3 and the sensor unit 4. Furthermore, the actuator 10 of the present embodiment includes: a movable body 120 that connects the lens unit 3 and the sensor unit 4; and a fixed body 110 that holds the movable body 120 in a state where it can rotate with at least one direction of the intersecting directions intersecting the optical axis direction as a rotation axis. Furthermore, the actuator 10 of the present embodiment includes a gimbal mechanism 110, and the gimbal mechanism 130 includes: a rotating member 136 that includes a frame-shaped top plate 131 that passes through the movable body 120 and a plurality of legs 132 that extend from the top plate 131 in the optical axis direction; and a support portion 134 that engages with the legs 132 and supports the legs 132 in a rotatable state.
[0023] Here, the rotating member 136 includes, as the leg 132, first leg 132A and 132B that protrude inwardly from the top plate 131 as viewed from the optical axis direction and extend in the optical axis direction, and second leg 132C and 132D that protrude outwardly from the top plate 131 and extend in the optical axis direction. That is, in a structure in which the movable body 120 is provided inside the fixed body 110 as viewed from the optical axis direction, the gimbal mechanism 130 supports the movable body 120 by the leg 132 that protrudes inwardly from the optical axis direction and extends in the optical axis direction, and supports the fixed body 110 by the leg 132 that protrudes outwardly from the optical axis direction and extends in the optical axis direction. By adopting such a structure, the gimbal mechanism 130 can be miniaturized, and the actuator 10 and the optical unit 1 that can connect the lens unit 3 and the sensor unit 4 can be miniaturized.
[0024] In addition, even if only the leg portion 132 constituting the gimbal mechanism 130 is extended in the optical axis direction and the leg portion 132 is pressed by the support portion 134 attached to the movable body 120 and the fixed body 110, the optical unit 1 can be made more compact compared with the structure in which the leg portion 132 constituting the gimbal mechanism 130 is extended in the direction intersecting the optical axis direction and the support portion 134 attached to the movable body 120 and the fixed body 110 is pressed by the leg portion 132. However, by adopting the structure in which the movable body 120 is supported by the leg portion 132 protruding inwardly as viewed in the optical axis direction and extending in the optical axis direction, and the fixed body 110 is supported by the leg portion 132 protruding outwardly as viewed in the optical axis direction and extending in the optical axis direction, the gimbal mechanism 130 can be made more compact.
[0025] In addition, as described above, in the actuator 10 of the present embodiment, the gimbal mechanism 130 includes, as the support portion 134, the first support portions 134A and 134B fixed to the movable body 120 and rotatably supporting the first leg portions 132A and 132B, and the second support portions 134C and 134D fixed to the fixed body 110 and rotatably supporting the second leg portions 132C and 132D. With such a structure, the movable body 120 can be supported to be rotatable relative to the fixed body 110 with both the yaw axis direction and the pitch axis direction as the rotation axis.
[0026] In addition, as described above, in the actuator 10 of the present embodiment, the support portion 134 is formed in a U-shape in which the engagement portion 134a engaged with the leg portion 132 and the fixed portion 134b fixed to the fixed body 110 or the movable body 120 face each other. Furthermore, the gimbal mechanism 130 supports the rotating member 136 by the elastic force of the U-shaped support portion 134, and holds the movable body 120 rotatable relative to the fixed body 110. By adopting such a structure, the rigidity of the rotating member 136 can be improved, and for example, even when the lens unit 3 having a large and heavy lens 3a is mounted on the movable body 120, the movable body 120 can be appropriately displaced relative to the fixed body 110.
[0027] In the actuator 10 of the present embodiment, the support portion 134 is arranged so as to overlap the center of gravity of the movable body 120 in the optical axis direction when the lens unit 3 and the sensor unit 4 are connected. With such a structure, when the movable body 120 is displaced relative to the fixed body 110, it is difficult to cause shaking, etc., and the movable body 120 can be appropriately displaced relative to the fixed body 110.
[0028] Finally, the present invention will be fully described below. (1) An actuator capable of connecting a lens unit and a sensor unit, comprising: a movable body, which connects the lens unit and the sensor unit; a fixed body, which maintains the movable body in a state where it can rotate with at least one of the directions intersecting the optical axis direction as a rotation axis; and a gimbal mechanism, which has a rotating component and a supporting portion, the rotating component having a frame-shaped top plate passing through the movable body and a plurality of legs extending from the top plate in the optical axis direction, the supporting portion engaging with the legs and supporting the legs in a state where they can rotate, the rotating component having, as the legs: a first leg, which protrudes inwardly from the top plate and then extends in the optical axis direction; and a second leg, which protrudes inwardly from the top plate and then extends in the optical axis direction. (2) In the actuator described in (1) above, the gimbal mechanism includes, as the supporting portion, a first supporting portion fixed to the movable body and supporting the first leg portion in a rotatable state; and a second supporting portion fixed to the fixed body and supporting the second leg portion in a rotatable state. (3) In the actuator described in (1) or (2) above, the supporting portion is formed into a U-shape relative to the engaging portion engaged with the leg and the fixed portion fixed to the fixed body or the movable body, and the gimbal mechanism utilizes the elastic force of the U-shaped supporting portion to support the rotating part, thereby maintaining the movable body so as to be rotatable relative to the fixed body. (4) In the actuator described in any one of (1) to (3) above, the support portion is disposed at a position of the center of gravity of the movable body in a state where the lens unit and the sensor unit are connected in the optical axis direction. (5) An optical unit includes: the actuator according to any one of (1) to (4) above; the lens unit; and the sensor unit. Explanation of symbols
[0033] 1 optical unit, 2 housing, 2a hole portion, 3 lens unit, 3a lens, 4 sensor unit, 10 actuator, 31 lens setting portion, 32 first connection portion, 41 large diameter portion, 41a image pickup element, 41b flexible substrate, 42 second connection portion, 110 fixed body, 111 first opposing surface, 112 second opposing surface, 113 third opposing surface, 114 fourth opposing surface, 115 flexible substrate configuration groove, 120 movable body, 121 first surface, 122 second surface, 123 third surface, 124 fourth surface, 125 first insertion port, 126 second insertion port, 130 gimbal mechanism, 131 top plate, 132 leg portion, 132A first leg portion, 132B A first leg, 132C a second leg, 132D a second leg, 133 a convex portion, 134 a supporting portion, 134a a locking portion, 134b a fixing portion, 134A a first supporting portion, 134B a first supporting portion, 134C a second supporting portion, 134D a second supporting portion, 135 a concave portion, 136 a rotating component, 140 a driving mechanism, 141 a magnet, 141A a magnet, 141B a magnet, 141C a magnet, 141D a magnet, 142 a coil, 142A a coil, 142B a coil, 142C a coil, 142D a coil, 143 a flexible substrate, 143A a flexible substrate, 143B a flexible substrate, 143C a flexible substrate, 143D a flexible substrate, AX an optical axis.
Claims
1. An actuator capable of connecting a lens unit and a sensor unit, characterized in that: have: a movable body connected to the lens unit and the sensor unit; a fixed body that holds the movable body in a state where it can rotate about at least one of the directions intersecting the optical axis direction as a rotation axis; as well as The gimbal mechanism comprises a rotating member and a supporting portion, wherein the rotating member comprises a frame-shaped top plate passing through the movable body and a plurality of legs extending from the top plate in the optical axis direction, and the supporting portion engages with the legs and supports the legs in a rotatable state. The rotating member includes, as the leg portion, a first leg portion, which protrudes toward the inner side of the top plate and then extends along the optical axis direction; and a second leg portion, which protrudes toward the outside of the top plate and then extends along the optical axis.
2. The actuator according to claim 1, characterized in that The gimbal mechanism includes, as the support portion, a first support portion that is fixed to the movable body and supports the first leg portion in a rotatable state; and a second support portion that is fixed to the fixed body and supports the second leg portion in a rotatable state.
3. The actuator according to claim 1 or 2, characterized in that: The support portion is formed in a U-shape in which an engaging portion engaged with the leg portion and a fixed portion fixed to the fixed body or the movable body face each other. The gimbal mechanism supports the rotating member by the elastic force of the U-shaped support portion, and holds the movable body rotatably relative to the fixed body.
4. The actuator according to claim 1 or 2, characterized in that: The support portion is disposed at a position of the center of gravity of the movable body in a state where the lens unit and the sensor unit are connected in the optical axis direction.
5. An optical unit, characterized in that: have: The actuator according to claim 1 or 2; the lens unit; and The sensor unit.
Citation Information
Patent Citations
Optical unit with tremor correction function, and manufacturing method of the same
JP2017021332A