Oscillatory linear actuator, hair cutting device, and method of manufacturing oscillatory linear actuator

Patent metadata

Field	Value
Publication number	US-10688673-B2
Application number	US-201815947919-A
Country	US
Kind code	B2
Filing date	Apr 9, 2018
Priority date	Apr 19, 2017
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An oscillatory linear actuator includes an electromagnetic core block including an electromagnet (electromagnetic part), and a magnetic block that holds permanent magnets so that the permanent magnets face the electromagnet with a predetermined space in between. The electromagnetic core block integrally includes a core, a coil bobbin, and a base, the core and the coil bobbin forming the electromagnet, and the base holding the core and the coil bobbin. The magnetic block includes the permanent magnets and a frame that holds the permanent magnets so as to allow the permanent magnets to oscillate freely and holds the electromagnetic core block. The frame has a guide portion that guides the electromagnetic core block to adjust a positional relation of the permanent magnets and the electromagnet, and the base is fixed to the frame inside the guide portion.

First claim

What is claimed is:

1. An oscillatory linear actuator comprising:
an electromagnetic core block including an electromagnet; and
a magnetic block that holds a permanent magnet so that the permanent magnet faces the electromagnet with a predetermined space in between,
wherein the electromagnetic core block integrally includes:
a core and a coil bobbin that form the electromagnet; and
a base that holds the core and the coil bobbin,

wherein the magnetic block includes:
the permanent magnet; and
a frame that holds the permanent magnet to allow the permanent magnet to oscillate freely and holds the electromagnetic core block,

wherein the frame has a guide portion that guides the electromagnetic core block to adjust a positional relation of the permanent magnet and the electromagnet, and
wherein the base is fixed to the frame inside the guide portion,
wherein the core has a first lug that protrudes in a first direction intersecting with a guide direction in which the guide portion guides the electromagnetic core block, and
wherein the base has:
a second lug that protrudes in the first direction intersecting with the guide direction to be engaged with the first lug and limit movement of the core in the guide direction; and
an engaging path that extends in a second direction intersecting with the guide direction and the first direction, and allows the first lug to move in the second direction to guide the first lug to an engagement position at which the first lug engages with the second lug.

2. The oscillatory linear actuator according to claim 1 ,
wherein the coil bobbin has a limiting protrusion that fits between the core and the base and limits movement of the core to prevent the first lug from moving from the engagement position.

3. A hair cutting device comprising:
the oscillatory linear actuator according to claim 1 ; and
a movable blade connected to the oscillatory linear actuator.

4. A method of manufacturing the oscillatory linear actuator according to claim 1 , the method comprising:
assembling the electromagnetic core block by mounting the core and the coil bobbin on the base;
adjusting the positional relation of the permanent magnet and the electromagnet by guiding the electromagnetic core block by the guide portion of the frame; and
fixing the base to the frame inside the guide portion.

5. An oscillatory linear actuator comprising:
an electromagnetic core block including an electromagnet; and
a magnetic block that holds a permanent magnet so that the permanent magnet faces the electromagnet with a predetermined space in between,
wherein the electromagnetic core block integrally includes:
a core and a coil bobbin that form the electromagnet; and
a base that holds the core and the coil bobbin,

wherein the magnetic block includes:
the permanent magnet; and
a frame that holds the permanent magnet to allow the permanent magnet to oscillate freely and holds the electromagnetic core block,
wherein the frame has a guide portion that guides the electromagnetic core block to adjust a positional relation of the permanent magnet and the electromagnet, and
wherein the base is fixed to the frame inside the guide portion,
wherein the core has a first lug that protrudes in a direction intersecting with a guide direction in which the guide portion guides the electromagnetic core block,

wherein the base has:
a second lug that protrudes in the direction intersecting with the guide direction to be engaged with the first lug and limit movement of the core in the guide direction; and
an engaging path that guides the first lug to an engagement position at which the first lug engages with the second lug, and

wherein the coil bobbin has a limiting protrusion that fits between the core and the base and limits movement of the core to prevent the first lug from moving from the engagement position.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Murakami Tomoaki
• Kobayashi Noboru
• Inoue Hiroki
• Moriguchi Masashi

Classifications

• H02K7/104

  with eddy-current brakes · CPC title

• H02K33/16 Primary

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

• B26B19/282 Primary

  Motors without a rotating central drive shaft, e.g. linear motors · CPC title

• H02K33/06

  with polarised armatures · CPC title

• B26B19/288

  Balance by opposing oscillation · CPC title