Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ELECTROMAGNETIC INDUCTION TYPE SPEAKER
Document Type and Number:
Japanese Patent JPH05176395
Kind Code:
A
Abstract:

PURPOSE: To induce a stable induction current to a diaphragm in accordance with a signal current supplied to an electromagnetic induction coil, to obtain highly efficient and sufficiently enough sound pressure output characteristics and to attain effective acoustic reproducing.

CONSTITUTION: This speaker is provided with a magnetic circuit part 11 for generating a DC magnetic field in a ring-like magnetic gap 19, a diaphragm 12 formed like a ring by a conductive material and supported in the gap 19 so as to be optionally oscillated and the 1st and 2nd electromagnetic induction coils 13, 14 arranged in the vicinity of the front side and rear side of the diaphragm 12 through the diaphragm 12. A signal current is supplied so that in- phase AC magnetic fields are generated around the coils 13, 14.


Inventors:
WATANABE HIROYUKI
Application Number:
JP2269591A
Publication Date:
July 13, 1993
Filing Date:
January 24, 1991
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SONY CORP
International Classes:
H04R9/02; H04R11/02; H04R13/00; H04R23/00; (IPC1-7): H04R9/02; H04R13/00
Domestic Patent References:
JPS5151928A1976-05-07
Attorney, Agent or Firm:
Akira Koike (2 outside)



 
Previous Patent: JPS5176394

Next Patent: PRODUCTION OF ULTRASONIC PROBE