Taut armature reciprocating impulse transducer

• US 5,825,297 A
• Filed: 07/19/1996
• Issued: 10/20/1998
• Est. Priority Date: 07/19/1996
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: McKee, John M., Brinkley, Gerald Eugene, Holden, deceased, Irving Harold, Mooney, Charles W.
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): WILSON JR, WILLIAM HALL
• Application Number:
  US08/684,957
• Time in Patent Office: 823 Days
• Field of Search: 340/825.44, 340/825.46, 340/407.1, 340/311.1, 340/691, 340/825.47, 340/825.69, 455/38.2, 455/426, 370/313, 370/310, 370/312, 116/204, 116/DIG. 44
• US Class Current: 340/7.6
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

A taut armature reciprocating impulse transducer (100) includes an electromagnetic driver (24, 26) which effects an alternating electromagnetic field in response to an input signal. An armature (12) includes an upper planar suspension member (14) formed by a first pair of non-linear spring members arranged along a first radial axis (50), and a lower planar suspension member (16) formed by a second pair of non-linear spring members arranged along a second radial axis (52) which is substantially perpendicular to the first radial axis (50). The upper and lower planar suspensions members are coupled to the electromagnetic driver (24, 26) and suspend a magnetic motional mass (18) therebetween. The alternating electromagnetic field alternately moves the magnetic motional mass (18), the movement being transformed through the upper and lower planar suspension members (14, 16) and the electromagnetic driver (24, 26) into motional energy.

Claims

1. A taut armature reciprocating impulse transducer, comprising:

an electromagnetic driver, for effecting an alternating electromagnetic field in response to an input signal;

an armature, including an upper planar suspension member formed by a first pair of non-linear spring members arranged along a first radial axis and a lower planar suspension member formed by a second pair of non-linear spring members arranged along a second radial axis, wherein said upper and lower planar suspension members are coupled to said electromagnetic driver, and said first radial axis of said upper planar suspension member is oriented substantially perpendicular to said second radial axis of said lower planar suspension member; and

a magnetic motional mass suspended between said upper and lower planar suspension members, and coupled to said alternating electromagnetic field for alternately moving said magnetic motional mass in response thereto, a displacement of said magnetic motional mass being transformed through said upper and lower planar suspension members and said electromagnetic driver into motional energy.

2. The taut armature reciprocating impulse transducer according to claim 1, wherein said first pair of non-linear spring members and said second pair of non-linear spring members are connected symmetrically about a contiguous planar central region, and further connected to a pair of contiguous planar end restraints.

3. The taut armature reciprocating impulse transducer according to claim 2, wherein said non-linear spring members are defined by circular outer perimeters and elliptical inner perimeters.

4. The taut armature reciprocating impulse transducer according to claim 2, wherein said non-linear spring members comprising a pair of juxtaposed planar compound beams.

5. The taut armature reciprocating impulse transducer according to claim 4, wherein said pair of juxtaposed planar compound beams each comprise at least two independent concentric arcuate beams.

6. The taut armature, reciprocating impulse transducer according to claim 5, wherein said at least two independent concentric arcuate beams exhibits a substantially identical spring rate (K).

7. The taut armature reciprocating impulse transducer according to claim 1, wherein said magnetic motional mass comprises:

a magnet support having upper cavities arranged about a third radial axis and formed substantially within opposite quadrants in an upper surface thereof, and further having lower cavities arranged about a fourth radial axis and formed substantially within opposite quadrants in a lower surface thereof, said third radial axis of said upper cavities being arranged substantially perpendicular to said fourth radial axis of said lower cavities; and

a plurality of permanent magnets retained within said upper and lower cavities to provide a magnet to electromagnetic driver interface of substantially 360°

.

8. The taut armature reciprocating impulse transducer according to claim 7, wherein said first radial axis of said upper planar suspension member is oriented substantially perpendicular to said third radial axis of said upper cavities, and wherein said second radial axis of said lower planar suspension member is oriented substantially perpendicular to said fourth radial axis of said lower cavities.

9. The taut armature reciprocating impulse transducer according to claim 7, wherein said magnet support further includes upper channels formed on said upper surface opposite said lower cavities, and lower channels formed on said lower surface opposite said upper cavities, said upper and lower channels enabling portions of said magnet support to pass freely through apertures within said upper and lower planar suspension members during movement of said magnetic motional mass.

10. The taut armature reciprocating impulse transducer according to claim 7, wherein each of said plurality of permanent magnets generates a magnetic field having a predetermined N-S magnetic field orientation, and

wherein said magnet support retains said plurality of permanent magnets such that said predetermined N-S magnetic field orientation of each of said plurality of permanent magnets are in opposition.

11. The taut armature reciprocating impulse transducer according to claim 10, wherein said predetermined N-S magnetic field orientation of each of said plurality of permanent magnets position in said upper cavities is oriented parallel to said third radial axis of said upper cavities, and said predetermined N-S magnetic field orientation of each of said plurality of permanent magnets position in said lower cavities is oriented parallel to said to said fourth radial axis of said lower cavities.

12. The taut armature reciprocating impulse transducer according to claim 7, wherein said magnet support further comprises features for preventing rotation of said magnetic motional mass relative to said upper and lower planar suspension members.

13. The taut armature reciprocating impulse transducer according to claim 1 further comprising a housing for enclosing said electromagnetic driver, armature, and said magnetic motional mass.

14. A communication device, comprising:

a housing enclosing a supporting substrate;

a receiver, coupled to said supporting substrate, for receiving and demodulating coded message signals including at least an address signal, and for deriving therefrom a demodulated address signal;

a decoder, coupled to said supporting substrate and to said receiver, for decoding the demodulated address signal, and for generating an alert control signal in response to the demodulated address signal matching a predetermined address; and

a taut armature reciprocating inertial transducer, responsive to the alert control signal being generated for generating a tactile alert, said taut armature reciprocating inertial transducer comprising

an electromagnetic driver, coupled to said supporting substrate and responsive to the alert control signal for effecting an alternating electromagnetic field,

an armature, including an upper planar suspension member formed by a first pair of non-linear spring members arranged along a first radial axis and a lower planar suspension member formed by a second pair of non-linear spring members arranged along a second radial axis, wherein said upper and lower planar suspension members are coupled to said electromagnetic driver, and said first radial axis of said upper planar suspension member is oriented substantially perpendicular to said second radial axis of said lower planar suspension member; and

a magnetic motional mass suspended between said upper and lower planar suspension members, and coupled to said alternating electromagnetic field for alternately moving said magnetic motional mass in response thereto, a displacement of said magnetic motional mass being transformed through said upper and lower planar suspension members and said electromagnetic driver into motional energy,

whereby the motional energy generated is coupled to said housing through said supporting substrate to provide a tactile alert alerting a reception of the coded message signals.