Dual mode transducer for a portable receiver

• US 5,524,061 A
• Filed: 08/29/1994
• Issued: 06/04/1996
• Est. Priority Date: 08/29/1994
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Holden, Irving H., McKee, John M., Mooney, Charles W., Brinkley, Gerald E.
• Primary Examiner(s): Isen, Forester W.
• Assistant Examiner(s): NGUYEN, DUC MINH
• Application Number:
  US08/297,730
• Time in Patent Office: 645 Days
• Field of Search: 340/825.46, 340/311.1, 381/192, 381/68, 381/68.3, 381/152, 381/194, 381/199, 381/151, 381/193, 381/200, 381/203
• US Class Current: 381/151
• CPC Class Codes: G08B 6/00 Tactile signalling systems, e.g. personal calling systems
• CPC Class Codes: H04M 19/04 the ringing-current being generated at the substations
• CPC Class Codes: H04M 19/047 Vibrating means for incoming calls
• CPC Class Codes: H04R 11/06 Telephone receivers

Abstract

A dual mode transducer (600) includes an electromagnetic driver (604), an armature including upper and lower substantially parallel planar suspension members (610) coupled to the driver (604), and a magnetic motional mass (616) suspended between the suspension members (610). The suspension members (610) include a plurality of independent planar non-linear spring members (612) arranged regularly about the central region (614) within a perimeter region (608). The spring members (612) are defined by members having maximum opposing widths tapering to minimum opposing widths at midpoints thereon, the maximum opposing widths are coupled to the central region (614) and to the perimeter region (608). The motional mass (616) couples to the electromagnetic field which alternately moves the motional mass (616), the movement being transformed through the spring members (612) and the driver (604) into motional energy. A soundboard (1014), coupled to the driver (604), couples the motional energy to a user.

Claims

1. A dual mode transducer, comprising:

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

an armature, including upper and lower substantially parallel planar suspension members, coupled to said electromagnetic driver, said upper and lower substantially parallel planar suspension members each comprising

a plurality of independent planar non-linear spring members arranged regularly about a central planar region within a planar perimeter region, said plurality of independent planar non-linear spring members being defined by members having maximum opposing widths tapering to minimum opposing widths at midpoints thereon, said maximum opposing widths being coupled to said central planar region and to said planar perimeter region;

a magnetic motional mass suspended between said upper and lower substantially parallel planar suspension members about said central planar region, and coupled to said alternating electromagnetic field for alternately moving said magnetic motional mass in response thereto, wherein movement of said magnetic motional mass is transformed through said plurality of independent planar non-linear spring members and said electromagnetic driver into motional energy; and

a soundboard, coupled to said electromagnetic driver, for coupling the motional energy to a user.

2. The dual mode transducer in accordance with claim 1 wherein said maximum opposing widths tapering to minimum widths at midpoints thereon are defined by spring members having an elliptical inner perimeter and a circular outer perimeter.

3. The dual mode transducer in accordance with claim 1, wherein said maximum opposing widths are twice said minimum opposing widths.

4. The dual mode transducer in accordance with claim 1 wherein said electromagnetic driver and said planar perimeter region of said armature have a periphery which are substantially circular, and wherein said electromagnetic driver is coupled at said periphery to said soundboard.

5. The dual mode transducer in accordance with claim 1 wherein said plurality of independent planar non-linear spring members are in tension during movement of said magnetic motional mass.

6. The dual mode transducer in accordance with claim 1 wherein the motional energy generated by said magnetic motional mass in response to the alternating electromagnetic field is acoustic energy in response to an audio input signal being coupled to said electromagnetic driver.

7. The dual mode transducer in accordance with claim 6 wherein the motional energy generated by said magnetic motional mass in response to the alternating electromagnetic field is tactile energy in response to a sub-audible input signal being coupled to said electromagnetic driver.

8. The dual mode transducer in accordance with claim 7 wherein said armature and said magnetic motional mass have a fundamental frequency, and wherein the sub-audible input signal is a periodically swept subaudible frequency signal having a swept frequency range above the fundamental frequency.

9. The dual mode transducer in accordance with claim 1 wherein said armature and said magnetic motional mass have a fundamental frequency and displacement amplitude associated therewith.

10. The dual mode transducer in accordance with claim 9 wherein the displacement amplitude of said magnetic motional mass increases non-linearly over a predetermined frequency range above the fundamental frequency.

11. A personal communication device comprising:

a housing having a portion thereof forming a soundboard;

a receiver, enclosed within said housing, for receiving and detecting coded message signals transmitted thereto;

processing means for processing the detected coded message signals; and

a dual mode transducer including

an electromagnetic driver, coupled to said soundboard and to said processing means, for effecting an alternating electromagnetic field in response to the processed coded message signals being coupled thereto, and

a resonant armature system, coupled to said electromagnetic driver, and comprising a magnetic motional mass being attached to a central planar region about which are regularly arranged a plurality of independent planar non-linear spring members defined by members having maximum opposing widths tapering to minimum opposing widths at midpoints thereon arranged within a planar perimeter region,

a plurality of independent planar non-linear spring members arranged regularly about a central planar region within a planar perimeter region,

said resonant armature system being responsive to the alternating electromagnetic field for alternately moving said magnetic motional mass, wherein motion induced thereby being transformed through said plurality of independent planar non-linear spring members and said electromagnetic driver into motional energy which is coupled through said soundboard to a user.

12. The personal communication device according to claim 11, wherein said coded message signals include at least an address signal associated therewith, and wherein said processing means comprises

a controller, responsive to the detected address signal matching a predetermined personal communication device address, for generating a subaudible alerting signal being coupled to said electromagnetic driver for effecting an alternating electromagnetic field in response thereto;

wherein the induced motion of said magnetic motional mass is transformed through said plurality of independent planar non-linear spring members and said electromagnetic driver into tactile energy to provide a vibratory response which is coupled through said soundboard to the user.

13. The personal communication device according to claim 12, wherein said coded message signals further include a voice message signal associated with the received address, and wherein said processing means processes the detected voice message signal which is coupled to said electromagnetic driver for effecting the alternating electromagnetic field in response thereto,

wherein the induced motion of said magnetic motional mass is transformed through said plurality of independent planar non-linear spring members and said electromagnetic driver into acoustic energy to provide an audible response which is coupled through said soundboard to the user.

14. The personal communication device according to claim 13 wherein said processing means comprises a high pass filter to attenuate received voice message signals below 150 Hz.

15. The personal communication device according to claim 14 wherein said dual mode transducer generates tactile energy when excited by a swept frequency burst between 80 Hz and 110 Hz.

16. The personal communication device according to claim 14 wherein said dual mode transducer generates acoustic energy when excited by frequencies between 300 Hz and 3000 Hz.

17. The personal communication device according to claim 13, wherein said coded message signals further include a call waiting signal interleaved with the voice message signal, and wherein said processing means processes the call waiting signal and the voice message signal, wherein the induced motion of said magnetic motional mass is transformed through said plurality of independent planar non-linear spring members and said electromagnetic driver into tactile and acoustic energy to provide both vibratory and audible responses which are coupled through said soundboard to the user.

18. The personal communication device according to claim 11, wherein said soundboard has a circular shape, and wherein said electromagnetic driver has a periphery which is substantially circular, whereby said electromagnetic driver is coupled at said periphery to said soundboard.

19. The personal communication device according to claim 18, wherein said soundboard having a circular shape has a center and an edge, and wherein said soundboard tapers from said center to said edge.

20. The dual mode transducer in accordance with claim 11 wherein said maximum opposing widths tapering to minimum widths at midpoints thereon, and are defined by spring members having an elliptical inner perimeter and circular outer perimeter, and wherein said plurality of independent planar non-linear spring members are coupled to said central planar region and said planar perimeter region at said maximum opposing widths.

21. The dual mode transducer in accordance with claim 20, wherein said maximum opposing widths are twice said minimum opposing widths.