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CN-122003879-A - Multifunctional vibration actuator

CN122003879ACN 122003879 ACN122003879 ACN 122003879ACN-122003879-A

Abstract

The invention discloses a multifunctional vibration actuator. The multifunctional vibration actuator includes a housing, a coil accommodated in the housing, a diaphragm connected to the coil, a movable member accommodated in the housing and vibrating, and a leaf spring attached to the housing and attached to the movable member. The housing includes a protruding portion having an open end portion and protruding radially outward and facing an outer peripheral portion of the diaphragm, and a through hole is formed in the protruding portion. The through hole is formed in the case at a position closer to the open end than the gap.

Inventors

  • Beware
  • YOSHIDA TOMOHISA

Assignees

  • 丰达电机株式会社

Dates

Publication Date
20260508
Application Date
20241011
Priority Date
20231023

Claims (8)

  1. 1. A multi-functional vibration actuator, comprising: A housing having an open end at one side; A coil housed in the case, the coil being disposed such that an axial direction thereof is along a depth direction of the case; A diaphragm which is arranged on the one side of the housing, is connected to the coil, and is capable of vibrating in the axial direction of the coil; A movable element housed in the case, the movable element including a magnet and being configured to vibrate in a vibration direction of the diaphragm by energizing the coil, the movable element being disposed with a gap between an outer peripheral surface of the movable element and an inner peripheral surface of the case to limit an amount of air movement, and A leaf spring mounted to the housing and mounted with the movable member, The housing has a protruding portion that includes the open end portion of the one side and protrudes radially outward, and that faces an outer peripheral portion of the diaphragm, A through hole is formed in the protruding portion, The through hole is formed in the case at a position closer to the open end than the gap.
  2. 2. The multi-functional vibration actuator of claim 1, wherein, An outer peripheral portion of the leaf spring is attached to the housing, and a center portion of the leaf spring is attached to a side of the movable member opposite to the diaphragm side.
  3. 3. The multi-functional vibration actuator of claim 1, wherein, The through hole penetrates the protruding portion in a direction along a radial direction of the housing.
  4. 4. The multi-functional vibration actuator of claim 2, wherein, The central part of the leaf spring is arranged at the central part of the bottom surface of the other side of the movable piece, The surface on the outer peripheral side of the bottom surface of the movable element is at least one of a slope inclined toward the other side as going inward in the radial direction and a connection surface connected to the bottom surface center portion via a step.
  5. 5. The multi-functional vibration actuator of claim 1, wherein, A groove is formed in an outer peripheral surface of the movable member, the groove extending in a circumferential direction of the outer peripheral surface.
  6. 6. The multi-functional vibration actuator of claim 5, wherein, The groove is formed in the entire circumference of the outer peripheral surface of the movable member.
  7. 7. The multi-functional vibration actuator of claim 5, wherein, The plurality of grooves are formed in parallel with each other with a space therebetween in the vibration direction of the movable member.
  8. 8. The multi-functional vibration actuator of claim 1, wherein, The outer peripheral side constituent part of the movable element is formed of a member separate from the main body part of the movable element.

Description

Multifunctional vibration actuator Technical Field The present disclosure relates to a multi-function vibration actuator. Background Japanese patent No. 4146346 discloses a technique related to a multi-function vibration actuator. The conventional multi-functional vibration actuator includes a magnetic circuit portion (movable member) that forms a magnetic circuit, a suspension (leaf spring) that supports the magnetic circuit portion, a diaphragm (diaphragm) disposed opposite to the magnetic circuit portion, a voice coil that is provided on the diaphragm and is inserted into a magnetic gap formed in the magnetic circuit portion, and a housing that houses the magnetic circuit portion. Here, the magnetic circuit portion is disposed such that a side surface of the magnetic circuit portion faces an inner surface of the casing with a gap for restricting an amount of air movement therebetween. Fig. 7 of japanese patent No. 4146346 shows a structure in which a through hole is provided in a side portion of a casing, and the through hole allows air to enter and exit. Disclosure of Invention [ Problem ] to be solved by the invention However, in this structure, the through hole is a structure including a portion lower than the suspension in the side portion of the housing, and if the side upper end portion of the magnetic circuit portion is displaced to a position corresponding to the through hole when the magnetic circuit portion vibrates, the length of the air flow path for restricting the movement amount of air cannot be maintained, and thus air in the vicinity of the side upper end portion of the magnetic circuit portion leaks from the through hole. If air leaks, the viscous resistance of the air flowing in and out of the gap between the side surface of the magnetic circuit portion and the inner surface of the casing is correspondingly reduced. In addition, if the movable member blocks the through hole, the diaphragm becomes difficult to move, affecting the acoustic performance. The present disclosure has been made in view of the above-described circumstances, and an object of the present disclosure is to provide a multifunctional vibration actuator capable of stably performing an acoustic generation function and a vibration generation function, respectively. [ Solution to the technical problem ] The multifunctional vibration actuator according to the first aspect includes a case having an open end portion on one side, a coil housed in the case and disposed so that an axial direction thereof extends in a depth direction of the case, a diaphragm disposed on the one side of the case and connected to the coil so as to be capable of vibrating in an axial direction of the coil, a movable element housed in the case, an outer peripheral surface of the movable element including a magnet and configured to vibrate in a vibration direction of the diaphragm by energizing the coil, and a leaf spring mounted to the case and having a protrusion including the open end portion on the one side and protruding radially outward, the protrusion being opposed to an outer peripheral portion of the diaphragm, the protrusion being formed with a through hole formed in a position closer to the end portion side than the gap in the case. In the multi-function vibration actuator of the first aspect, a housing having an open end on one side houses a coil that is arranged such that an axial direction thereof is along a depth direction of the housing. A diaphragm is disposed on the one side of the housing, and is connected to the coil and is capable of vibrating in the axial direction of the coil. In addition, a movable element is accommodated in the housing, and an outer peripheral surface of the movable element is disposed with a gap for restricting an air movement amount from an inner peripheral surface of the housing. The movable member includes a magnet, and vibrates in a vibration direction of the diaphragm by energizing the coil. A leaf spring is attached to the housing, and a movable member is attached to the leaf spring. In summary, the multi-function vibration actuator has a sound generation function capable of generating sound by vibrating the diaphragm by energizing the coil, and also has a vibration generation function capable of vibrating the movable element to generate vibration, and the movable element can generate vibration with a small amount of change in acceleration relative to the amount of change in frequency by vibrating while suppressing the amplitude. The housing has a projection portion including an open end portion on one side, projecting radially outward and facing the outer peripheral portion of the diaphragm, and the projection portion has a through hole. The through hole is formed in the case at a position on the open end side of the gap. Accordingly, air can be introduced into and discharged from the through hole of the extension portion when the diaphragm vibrates, and therefore, the amount of movement of air can b