CN-122028990-A - Vibration actuator and vibration presentation device

Abstract

The vibration presentation device includes a fixed portion having a magnetic force generating portion in which a plate-shaped magnetic core is inserted through a coil and both end portions of the magnetic core protrude from the coil, and a base portion in which the magnetic force generating portion is fixed in a state in which both end portions overlap with an upper surface, a movable portion having a plate-shaped magnetic member facing both end portions from above in a plane perpendicular to the upper surface, and a weight portion arranged at a position avoiding the magnetic force generating portion on a lower surface of the magnetic member, and an elastic body having a frame-like body surrounding a first edge and a second edge of the movable portion, the movable portion being connected to the fixed portion by a pair of first connection portions of the first edge and the second connection portions of the second edge, and the movable portion being displaced to approach the fixed portion by a magnetic force generated by energizing the coil, and vibrating.

Inventors

• Yosuke Kiyoshita
• SATO SOICHI

Assignees

• 美蓓亚三美株式会社

Dates

Publication Date

20260512

Application Date

20241017

Priority Date

20231027

Claims (9)

1. 1. A vibration actuator, comprising: A fixing portion having a magnetic force generating portion that inserts a plate-shaped magnetic core into a coil and protrudes both end portions of the magnetic core from the coil, and a base portion that fixes the magnetic force generating portion in a state in which the both end portions overlap with an upper surface; a movable part having a plate-shaped magnetic member facing the both end parts from above in a plane perpendicular to the upper surface, and a weight part arranged on the lower surface of the magnetic member at a position avoiding the magnetic force generating part, and An elastic body having a frame-like body surrounding a first pair of sides and a second pair of sides of the movable portion, the elastic body being connected to the movable portion by a pair of first connecting portions of the first pair of sides and connected to the fixed portion by a pair of second connecting portions of the second pair of sides, The movable portion is displaced so as to approach the fixed portion by a magnetic force generated by energizing the coil, thereby vibrating.
2. 2. A vibration actuator according to claim 1, wherein, The base portion has an opening portion at a central portion, The magnetic force generating unit is configured to fix the lower portion of the coil to the base unit while being disposed in the opening.
3. 3. A vibration actuator according to claim 1, wherein, The frame-like body of the elastic body is formed so as to surround the base portion, and the second opposite sides of the frame-like body are fixed to protruding connecting portions protruding from an outer periphery of the base portion by the pair of second connecting portions.
4. 4. A vibration actuator according to claim 3, wherein, The weight portion has a plurality of weight pieces fixed to the pair of first connecting portions, respectively, and connected to the magnetic member at an upper surface thereof in an erect manner.
5. 5. A vibration actuator according to claim 3, wherein, The base portion is provided with a cutout portion in which the pair of first connection portions are movably arranged in the plane-perpendicular direction.
6. 6. A vibration actuator according to claim 1, wherein, The weight is a plate-shaped weight having a thickness equal to or less than the magnetic core, and is arranged in the same layer as the elastic body.
7. 7. The vibration actuator according to claim 6, wherein, Plate-shaped fixing pieces extending in the axial direction of the coil and arranged on the upper surface are respectively arranged at the two ends, The elastic body is fixed to the fixing piece portion by the pair of second connection pieces so that the frame-shaped body is separated from the upper surface of the base portion.
8. 8. A vibration actuator according to claim 1, wherein, The magnetic member has an opening portion in which a part of the coil is disposed.
9. 9. A vibration presentation device comprising the vibration actuator according to claim 1 disposed on the back surface of the operation surface, The vibration prompting device is characterized in that, And energizing the coil in response to a user's contact with the operation surface, and presenting vibration by displacing the movable portion so that the movable portion approaches the fixed portion.

Description

Vibration actuator and vibration presentation device Technical Field The present invention relates to a vibration actuator and a vibration presentation device provided with the vibration actuator. Background For example, patent documents 1 to 2 disclose various structures in which vibration generated by an electromagnetic mechanism is given as a touch or an operational feeling (hereinafter, these are collectively referred to as "touch feeling") to a finger or the like of an operator in contact with an operation panel such as a touch panel (hereinafter, also simply referred to as "panel"). The vibration actuator described in patent document 1 is configured such that a guide shaft is arranged perpendicularly to a panel surface, and a movable magnet and a fixed coil are arranged on the inner side and the outer side in the radial direction of the shaft, so that the movable magnet reciprocates along the guide shaft. Thus, the device itself requires a height of more than a certain level. The vibration actuator (vibration presenting device) described in patent document 2 has a center yoke arranged perpendicular to a panel surface, and a movable coil and a fixed magnet arranged on the inner side and the outer side in the radial direction of a shaft. Further, a support portion is provided, which supports the panel by surrounding the outer periphery thereof with a standing wall, and the moving coil is reciprocally moved along the center yoke inside the support portion. Therefore, the device itself also needs to have a height of more than a certain level. In addition, in the vibration actuators described in patent documents 1 and 2, a magnet (permanent magnet) is used, and there are problems in terms of manufacturing cost and ease of manufacture. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2015-070729 Patent document 2 Japanese patent laid-open publication 2016-163854 Disclosure of Invention Problems to be solved by the invention Further miniaturization and thinning are desired in comparison with the conventional vibration actuator. Further, since a higher output is desired than in the conventional vibration actuator, in patent document 2, the coil is disposed on the movable portion side, and the weight of the movable portion is increased to enable the higher output. The invention aims to provide a vibration actuator and a vibration presentation device, which can ensure the thinness of the whole device and stably vibrate with high output. Means for solving the problems The vibration actuator of the present invention adopts the following structure: the vibration actuator has: A fixing portion having a magnetic force generating portion that inserts a plate-shaped magnetic core into a coil and protrudes both end portions of the magnetic core from the coil, and a base portion that fixes the magnetic force generating portion in a state in which the both end portions overlap with an upper surface; a movable part having a plate-shaped magnetic member facing the both end parts from above in a plane perpendicular to the upper surface, and a weight part arranged on the lower surface of the magnetic member at a position avoiding the magnetic force generating part, and An elastic body having a frame-like body surrounding a first pair of sides and a second pair of sides of the movable portion, the elastic body being connected to the movable portion by a pair of first connecting portions of the first pair of sides and connected to the fixed portion by a pair of second connecting portions of the second pair of sides, The movable portion is displaced so as to approach the fixed portion by a magnetic force generated by energizing the coil, thereby vibrating. The vibration presenting device of the present invention is configured such that the vibration actuator is disposed on the back surface of the operation surface, and the vibration is presented by energizing the coil in response to a contact of the operation surface by a user, and displacing the movable portion so as to approach the fixed portion. Effects of the invention According to the present invention, the entire device can be made thin and vibration can be stably performed at a high output. Drawings Fig. 1 is an external perspective view of a vibration actuator according to embodiment 1 of the present invention. Fig. 2 is a bottom view of the vibration actuator. Fig. 3 is an exploded perspective view showing the main part structure of the vibration actuator. Fig. 4 is an exploded perspective view of the vibration actuator. Fig. 5 is a perspective view of the core of the vibration actuator as seen from below. Fig. 6 is an exploded perspective view of the core. Fig. 7 is a sectional view taken along line A-A in fig. 1. Fig. 8 is a sectional view taken along line B-B in fig. 1. Fig. 9 is a diagram for explaining a magnetic circuit of the vibration actuator. Fig. 10 is a diagram showing a circuit configuration of a control un