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US-12627208-B2 - Vibration generating device with fixed case with first outer and inner cylinders and second cylinder attached to end of first outer cylinder

US12627208B2US 12627208 B2US12627208 B2US 12627208B2US-12627208-B2

Abstract

A vibration generating device including a fixed case including a tube extending in a first direction; a coil attached inside the tube; a movable body arranged inside the coil and including a magnetic field generator configured to generate a magnetic field toward the coil; and a support member interposed between the fixed case and the movable body and supporting the movable body inside the coil such that the movable body is configured to vibrate in the first direction. The fixed case includes a first fixed case member including a first outer cylinder and an inner cylinder extending from the first outer cylinder along the first direction, and a second fixed case member including a second outer cylinder attached to an end of the first outer cylinder to cover the inner cylinder. The coil is wound around the inner cylinder and covered by the second outer cylinder.

Inventors

  • Tomoya Endo

Assignees

  • ALPS ALPINE CO., LTD.

Dates

Publication Date
20260512
Application Date
20231221
Priority Date
20230209

Claims (6)

  1. 1 . A vibration generating device comprising: a fixed case including a tube extending in a first direction; a coil attached inside the tube; a movable body arranged inside the coil, the movable body including a magnetic field generator configured to generate a magnetic field toward the coil; and a support member interposed between the fixed case and the movable body and supporting the movable body inside the coil such that the movable body is configured to vibrate in the first direction, wherein the fixed case includes a first fixed case member including a first outer cylinder and an inner cylinder having an outer diameter less than an outer diameter of the first outer cylinder and extending from the first outer cylinder along the first direction, and a second fixed case member including a second outer cylinder attached to an end of the first outer cylinder to cover the inner cylinder, wherein the coil is wound around the inner cylinder and covered by the second outer cylinder, and wherein the movable body further includes a movable tubular case configured to fix the magnetic field generator to the support member, an outer diameter of the movable tubular case being less than an inner diameter of the inner cylinder.
  2. 2 . The vibration generating device as claimed in claim 1 , wherein the support member is a plate spring member attached to an end of the movable body in the first direction, and wherein the plate spring member is supported by a step provided inside the fixed case.
  3. 3 . The vibration generating device as claimed in claim 2 , wherein the plate spring member is fixed to the step by an adhesive.
  4. 4 . The vibration generating device as claimed in claim 3 , wherein the movable body is fixed to the plate spring member by an adhesive.
  5. 5 . A vibration generating device, comprising: a fixed case including a tube extending in a first direction; a coil attached inside the tube; a movable body arranged inside the coil, the movable body including a magnetic field generator configured to generate a magnetic field toward the coil; and a support member interposed between the fixed case and the movable body and supporting the movable body inside the coil such that the movable body is configured to vibrate in the first direction, wherein the fixed case includes a first fixed case member including a first outer cylinder and an inner cylinder having a diameter less than a diameter of the first outer cylinder and extending from the first outer cylinder along the first direction, and a second fixed case member including a second outer cylinder attached to an end of the first outer cylinder to cover the inner cylinder, wherein the coil is wound around the inner cylinder and covered by the second outer cylinder, wherein a wiring substrate is attached to the first fixed case member from a distal surface to a proximal surface forming a step in the first direction on an outer circumferential surface of the first outer cylinder, and wherein the wiring substrate includes: a first conductor pattern to which an end portion of the coil is connected, at a position on the proximal surface covered by the second outer cylinder, and a second conductive pattern to which an external wiring is connected, at a position on the distal surface that is not covered by the second outer cylinder.
  6. 6 . A vibration generating device comprising: a fixed case including a tube extending in a first direction; a coil attached inside the tube; a movable body arranged inside the coil, the movable body including a magnetic field generator configured to generate a magnetic field toward the coil; and a support member interposed between the fixed case and the movable body and supporting the movable body inside the coil such that the movable body is configured to vibrate in the first direction, wherein the fixed case includes a first fixed case member including a first outer cylinder and an inner cylinder having a diameter less than a diameter of the first outer cylinder and extending from the first outer cylinder along the first direction, and a second fixed case member including a second outer cylinder attached to an end of the first outer cylinder to cover the inner cylinder, wherein the coil is wound around the inner cylinder and covered by the second outer cylinder, wherein the magnetic field generator includes a permanent magnet having a magnetization direction in the first direction, a first pole piece disposed on one end side of the permanent magnet in the first direction and configured to generate a magnetic field extending in a second direction perpendicular to the first direction, and a second pole piece disposed on another end side of the permanent magnet in the first direction and configured to generate a magnetic field extending in the second direction, and wherein the coil is not disposed to face an outer side of one pole piece among the first pole piece and the second pole piece in the second direction, and is disposed to face an outer side of another pole piece among the first pole piece and the second pole piece in the second direction.

Description

CROSS-REFERENCE TO RELATED APPLICATION This patent application is based on and claims priority to Japanese Patent Application No. 2023-018656 filed on Feb. 9, 2023, the entire contents of which are incorporated herein by reference. BACKGROUND 1. Field of the Invention The present disclosure relates to a vibration generating device. 2. Description of the Related Art A vibration actuator including a case that accommodates a coil bobbin around which a coil can be directly wound is known (see Patent Document 1). Additionally, a vibration actuator in which a coil bobbin around which a coil can be directly wound is formed in a part of a case is known (see Patent Document 2). RELATED-ART DOCUMENTS Patent Document Patent Document 1: Japanese Laid-Open Patent Application Publication No. 2020-199495Patent Document 2: International Publication Pamphlet No. WO 2020-045470 SUMMARY According to one aspect of an embodiment, a vibration generating device including a fixed case including a tube extending in a first direction; a coil attached inside the tube; a movable body arranged inside the coil, the movable body including a magnetic field generator configured to generate a magnetic field toward the coil; and a support member interposed between the fixed case and the movable body and supporting the movable body inside the coil such that the movable body is configured to vibrate in the first direction. The fixed case includes a first fixed case member including a first outer cylinder and an inner cylinder having a diameter less than a diameter of the first outer cylinder and extending from the first outer cylinder along the first direction, and a second fixed case member including a second outer cylinder attached to an end of the first outer cylinder to cover the inner cylinder. The coil is wound around the inner cylinder and covered by the second outer cylinder. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view illustrating an example of a configuration of a vibration generating device; FIG. 2 is an exploded perspective view of a fixed case constituting the vibration generating device; FIG. 3 is an exploded perspective view of members constituting the vibration generating device; FIG. 4 is a cross-sectional view of the vibration generating device; FIG. 5 is a view of a coil and a movable body constituting the vibration generating device; FIG. 6 is a schematic cross-sectional view of a driver constituting the vibration generating device; FIG. 7 is a schematic cross-sectional view of the driver constituting the vibration generating device; FIG. 8 is a cross-sectional view of the members constituting the vibration generating device; FIG. 9 is a cross-sectional view of the members constituting the vibration generating device; FIG. 10 is a cross-sectional view of the members constituting the vibration generating device; FIG. 11 is a cross-sectional view of the members constituting the vibration generating device; FIG. 12 is a cross-sectional view of the members constituting the vibration generating device; and FIG. 13 is a perspective view of another configuration example of a movable case constituting the vibration generating device. DETAILED DESCRIPTION In the configuration disclosed in Patent Document 1, a case and a coil bobbin are formed as separate members, and therefore, a problem such as power loss or noise due to a rattling movement between the case and the coil bobbin may occur. In the configuration disclosed in Patent Document 2, it is necessary to attach a cover to the outer side of the coil in order to prevent the coil wound around the coil bobbin, which is a part of the case, from being exposed to the outside, and the number of components may increase. Thus, it is desired to provide a vibration generating device that can suppress the occurrence of the problem caused by the rattling movement between the case and the coil bobbin and can suppress an increase in the number of components. The vibration generator described above can suppress the occurrence of a problem such as power loss or noise, and suppress an increase in the number of components. In the following, a vibration generating device 101 according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a view illustrating a configuration example of the vibration generating device 101. Specifically, an upper drawing of FIG. 1 is a perspective view of the vibration generating device 101, and a lower drawing of FIG. 1 is an exploded perspective view of the vibration generating device 101. In FIG. 1, X1 represents one direction of the X-axis of the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. Additionally, Y1 represents one direction of the Y-axis of the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y-axis. Similarly, Z1 represents one direction of the Z-axis of the three-dimensional orthogonal coordinate syste