Energy conversion apparatus and speaker structure

Patent metadata

Field	Value
Publication number	US-9736576-B2
Application number	US-201514819605-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Aug 11, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An energy conversion apparatus including a permanent magnet fixed to a predetermined region; and a diaphragm arranged on the permanent magnet, the diaphragm including a coil having a conductor wire pattern formed on the diaphragm, wherein the diaphragm includes a slit formed in the diaphragm.

First claim

What is claimed is:

1. An electroacoustic transducer comprising:
a permanent magnet fixed to-a surface of a substrate; and
a diaphragm arranged on the permanent magnet, the diaphragm including a coil having a conductor wire pattern formed on the diaphragm,
wherein the diaphragm includes a slit formed in the diaphragm,
wherein the slit includes a plurality of slits periodically formed in the diaphragm, and
wherein lengths of the plurality of slits and a gap between the plurality of slits are a half to quarter wavelength of a minimum frequency of a signal applied to the coil.

2. The electroacoustic transducer according to claim 1 ,
wherein the surface of the substrate is curved.

3. A speaker structure comprising, the electroacoustic transducer according to claim 1 .

4. The speaker structure according to claim 3 ,
wherein the slit includes a plurality of slits periodically formed in the diaphragm, and
the plurality of slits are formed in both directions of a longitudinal direction of the diaphragm and a direction perpendicular to the longitudinal direction.

5. The speaker structure according to claim 3 , further comprising:
a sheet provided between the permanent magnet and the diaphragm, the sheet being formed by weaving a metal or a glass in a fibrous form into the sheet.

6. The speaker structure according to claim 3 ,
wherein an insulating layer including at least titanium oxide is formed on a surface of the diaphragm.

7. The electroacoustic transducer according to claim 1 ,
wherein the permanent magnet is formed
in a rectangular shape, and
with alternating bands of north pole regions and south pole regions that extend in a widthwise direction of the rectangular shape of the permanent magnet.

8. The electroacoustic transducer according to claim 7 ,
wherein a pitch between each of the widthwise extending north pole region and the widthwise extending south pole is equal to a pitch of the coil formed on the diaphragm.

9. The electroacoustic transducer according to claim 7 ,
wherein the diaphragm is positioned over the permanent magnet a conductor wire pattern of the coil formed on the diaphragm lies over a border between the north pole region and the south pole region of the permanent magnet.

Assignees

• Ricoh Co Ltd

Inventors

• Shinotsuka Michiaki
• Kawase Tsutomu

Classifications

• H04R19/013

  for loudspeakers · CPC title

• H04R7/122

  comprising a plurality of sections or layers · CPC title

• H04R9/047

  in which the windings of the moving coil lay in the same plane · CPC title

• H04R1/34 Primary

  by using a single transducer with sound reflecting, diffracting, directing or guiding means {(specially adapted for hearing aids H04R25/402)} · CPC title

• H04R1/028

  associated with devices performing functions other than acoustics, e.g. electric candles · CPC title