Vibration generation device, vibration reduction device, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-2023275497-A1
Application number	US-202318175626-A
Country	US
Kind code	A1
Filing date	Feb 28, 2023
Priority date	Feb 28, 2022
Publication date	Aug 31, 2023
Grant date	—

Abstract

A vibration generation device includes: a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including a magnet, and a coil disposed to face the magnet in a non-contact manner, and configured to swing the pendulum. One member of the magnet and the coil is provided at a position on the pendulum away from the rotation axis. The base includes a support portion supporting the pendulum swingably around the rotation axis. A part of an extension surface of a facing surface of the support portion facing the pendulum is included in a swingable range of the pendulum. The support portion is provided outside the swingable range of the pendulum when viewed along the rotation axis.

First claim

What is claimed is:

1 . A vibration generation device comprising:
a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including
a magnet, and
a coil disposed to face the magnet in a non-contact manner, and
configured to swing the pendulum, wherein one member of the magnet and the coil is provided at a position on the pendulum away from the rotation axis, the base includes a support portion supporting the pendulum swingably around the rotation axis, a part of an extension surface of a facing surface of the support portion facing the pendulum is included in a swingable range of the pendulum, and the support portion is provided outside the swingable range of the pendulum when viewed along the rotation axis.

2 . The vibration generation device according to claim 1 , wherein
the support portion includes a portion overlapping with the one member in the swingable range of the pendulum when viewed from an extending direction of the pendulum from the rotation axis.

3 . The vibration generation device according to claim 1 , wherein
the pendulum includes
an arm supported by the support portion swingably around the rotation axis, and
a weight portion provided at the arm, and
the support portion includes a portion overlapping with the weight portion in a swingable range of the arm when viewed from an extending direction of the arm from the rotation axis.

4 . The vibration generation device according to claim 1 , wherein
the pendulum includes an arm supported by the support portion swingably around the rotation axis, and the support portion includes a portion overlapping with the arm in a swingable range of the arm when viewed from an extending direction of the arm from the rotation axis.

5 . A vibration generation device comprising:
a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including
a magnet, and
a coil disposed to face the magnet in a non-contact manner, and
configured to swing the pendulum, wherein one member of the magnet and the coil is provided at a position on the pendulum away from the rotation axis, and the base includes
a support portion supporting the pendulum swingably around the rotation axis, and
an avoidance portion, configured to avoid contact with an opposite-side free end of the pendulum from the rotation axis when the pendulum swings, on the free end side.

6 . The vibration generation device according to claim 5 , wherein
the support portion has a facing surface facing the pendulum, and the avoidance portion is an opening penetrating the base in a direction perpendicular to the facing surface.

7 . The vibration generation device according to claim 5 , wherein
the support portion has a facing surface facing the pendulum, and the avoidance portion is a recess provided at the base facing the free end in a swinging direction of the pendulum.

8 . The vibration generation device according to claim 5 , wherein
the one member is disposed in the avoidance portion when the pendulum swings.

9 . The vibration generation device according to claim 5 , wherein
the pendulum includes
an arm supported by the support portion swingably around the rotation axis, and
a weight portion provided at the arm, and
the weight portion is disposed in the avoidance portion when the arm swings.

10 . The vibration generation device according to claim 5 , wherein
the pendulum includes an arm supported by the support portion swingably around the rotation axis, and the arm is disposed in the avoidance portion when the arm swings.

11 . The vibration generation device according to claim 5 , wherein
the base constitutes a housing that houses the pendulum, and the avoidance portion is provided at a surface of the base facing a swinging direction of the pendulum.

12 . A vibration generation device comprising:
a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including
a magnet, and
a coil disposed to face the magnet in a non-contact manner, and
configured to swing the pendulum, wherein the base includes a support portion supporting the pendulum, one member of the magnet and the coil is provided at a tip end portion of the pendulum in an extending direction of the pendulum from the rotation axis, the tip end portion is located outside the support portion when viewed from a position facing the support portion, and an end portion of the support portion and the other member of the magnet and the coil are spaced apart from each other.

13 . A vibration generation device comprising:
a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including
a magnet, and
a coil disposed to face the magnet in a non-contact manner, and
configured to swing the pendulum, wherein one of the magnet and the coil is provided at a position on the pendulum away from the rotation axis, the base includes a support portion supporting the pendulum swingably around the rotation axis, the pendulum extends to an outside of the support portion when viewed from a position facing the support portion, and an opposite-side free end of the pendulum from the rotation axis is disposed at a position not overlapping with the base when viewed from the position facing the support portion.

14 . A vibration reduction device comprising:
the vibration generation device according to claim 1 ; a detection unit configured to detect vibration of the object; and an operation control unit configured to cause the vibration generation device to generate vibration opposite in phase from the vibration detected by the detection unit.

15 . An electronic apparatus comprising:
the vibration reduction device according to claim 14 .

16 . The electronic apparatus according to claim 15 , further comprising:
a projection optical device configured to project an image, wherein the vibration reduction device is attached to the projection optical device.

Assignees

• Seiko Epson Corp

Inventors

• Wakabayashi Shinichi
• Takahashi Tatsuya

Classifications

• H02K33/16 Primary

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• B06B2201/30

  with electronic damping · CPC title

• H02K33/18 Primary

  with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets · CPC title

• H02K11/20

  for measuring, monitoring, testing, protecting or switching (rectifiers H02K11/04; power electronics H02K11/33) · CPC title