US5023504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezo-electric resonant vibrator for selective call receiver
Assignee: Motorola Solutions Inc
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Filing: 1990-04-26
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Granted: 1991-06-11
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Expires: 2010-04-26
Abstract
Abstract A piezo-electric resonant vibrator is described comprising a resonant armature having a centrally located weight, and at least four planar circular spring members which provide a restoring force normal to the movement of the weighted armature within a non-magnetic housing which encloses and supports the armature. A piezo-electric driver is coupled to the armature for inducing movement of the armature at a predetermined resonant frequency. A ferromagnetic plate is mounted to the housing and magnetically couples to a magnet which is coupled to the weight to maintain tension on the armature when an excitation signal is not supplied to the piezo-electric driver, and the armature is at equilibrium.
Inventors
- 👤 Charles W. Mooney
- 👤 Irving H. Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:14
CPC Classifications
H; H04; H04R; H04R17/00; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; G; G08; G08B; G08B6/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
105 words
A piezoelectric resonant vibrator, comprising: an armature having a planar circular perimeter region, a planar central region, and a plurality of planar circular spring members, arranged regularly around said central region within said perimeter region, and coupled to said perimeter region and to said central region; a weight, coupled to said central region, said weight including a magnetic member for maintaining tension on said armature; actuator means, coupled to said perimeter region, for inducing movement of said armature at a predetermined resonant frequency; and a housing, comprising an upper member and a lower member, coupled to said perimeter region, for enclosing and supporting said armature.
Claim 2
Dependent Claim
105 words
A piezoelectric resonant vibrator, comprising: an armature having a planar circular perimeter region, a planar central region, and a plurality of planar circular spring members, arranged regularly around said central region within said perimeter region, and coupled to said perimeter region and to said central region; a weight, coupled to said central region, said weight including a magnetic member for maintaining tension on said armature; actuator means, coupled to said perimeter region, for inducing movement of said armature at a predetermined resonant frequency; and a housing, comprising an upper member and a lower member, coupled to said perimeter region, for enclosing and supporting said armature.
Claim 3
Dependent Claim
53 words
The piezoelectric resonant vibrator of claim 1, wherein said armature has an upper surface and a lower surface, and wherein a first portion of said weight is coupled to the upper surface of said central region, and a second portion of said weight is coupled to said lower surface of said central region.
Claim 4
Dependent Claim
16 words
The piezoelectric resonant vibrator of claim 2, wherein said weight is fabricated from a non-magnetic material.
Claim 5
Dependent Claim
54 words
The piezoelectric resonant vibrator of claim 2, wherein said housing further includes a ferromagnetic member, coupled to said lower housing member, and wherein said magnetic member is coupled to said second portion of said weight, whereby the tension on said armature is maintained by the attraction of said magnetic member to said ferromagnetic member.
Claim 6
Dependent Claim
15 words
The piezoelectric resonant vibrator of claim 1, wherein said armature is fabricated from sheet metal.
Claim 7
Dependent Claim
15 words
The piezoelectric resonant vibrator of claim 5, wherein said sheet metal is a nickel alloy.
Claim 8
Dependent Claim
26 words
The piezoelectric resonant vibrator of claim 1, wherein said planar circular spring members have a rectangular cross-section wherein the width is substantially greater than the thickness.
Claim 9
Dependent Claim
16 words
The piezoelectric resonant vibrator of claim 1, wherein said housing is fabricated from a nonmagnetic material.
Claim 10
Dependent Claim
16 words
The piezoelectric resonant vibrator of claim 1, wherein said actuator means is a piezo-ceramic ring driver.
Claim 11
Dependent Claim
18 words
The piezoelectric resonant vibrator of claim 1, wherein said armature includes at least four planar circular spring members.
Claim 12
Dependent Claim
24 words
The piezoelectric resonant vibrator of claim 10, wherein said planar circular spring members are arranged orthogonally around said central region within said perimeter region.
Claim 13
Dependent Claim
20 words
The piezoelectric resonant vibrator of claim 1, wherein the armature movement is normal to the direction of the restoring force.
Claim 14
Dependent Claim
15 words
The piezoelectric resonant vibrator of claim 1, wherein the resonance of the armature is subaudible.
Claim 15
Dependent Claim
27 words
The piezoelectric resonant vibrator of claim 13, wherein the resonant frequency of said planar circular spring members is tunable by adjusting the inside diameter of said members.
Claim 16
Dependent Claim
61 words
A piezoelectric resonant vibrator, comprising: a planar resonant armature having a centrally located weight, and including a plurality of planar spring members for providing a restoring force normal to the movement of the weighted armature; a housing for enclosing and supporting said armature; and actuator means, coupled to said armature, for inducing movement of said armature at a predetermined resonant frequency.
Claim 17
Dependent Claim
61 words
A piezoelectric resonant vibrator, comprising: a planar resonant armature having a centrally located weight, and including a plurality of planar spring members for providing a restoring force normal to the movement of the weighted armature; a housing for enclosing and supporting said armature; and actuator means, coupled to said armature, for inducing movement of said armature at a predetermined resonant frequency.
Claim 18
Dependent Claim
33 words
The piezoelectric resonant vibrator of claim 1, wherein said actuator means is a piezo-ceramic ring driver which radially expands to produce an impulse to the armature at the resonant frequency when electrically excited.
Claim 19
Dependent Claim
17 words
The piezoelectric resonant vibrator of claim 15, wherein said armature includes at least four planar spring members.
Claim 20
Dependent Claim
19 words
The piezoelectric resonant vibrator of claim 17, wherein said planar spring members are arranged orthogonally about said central weight.
Claim 21
Dependent Claim
16 words
The piezoelectric resonant vibrator of claim 15, wherein said planar spring members have a circular geometry.
Claim 22
Dependent Claim
37 words
The piezoelectric resonant vibrator of claim 15, further comprising: a ferromagnetic member coupled to said housing; and a magnetic member coupled to said armature, and magnetically coupled to said ferromagnetic member, for maintaining tension on said armature.
Claim 23
Dependent Claim
99 words
A selective call receiver providing a vibrating alert, comprising: a receiver for receiving and detecting selective call signals; a decoder, responsive to the selective call signals, for generating an alert signal in response thereto; and a piezoelectric resonant vibrator, comprising a resonant armature having a centrally located weight, and including a plurality of planar spring members for providing a restoring force normal to the movement of the weighted armature, and an actuator means, coupled to said armature and responsive to the alert signal, for inducing movement of said armature at a predetermined resonant frequency to provide the vibrating alert.
Claim 24
Dependent Claim
99 words
A selective call receiver providing a vibrating alert, comprising: a receiver for receiving and detecting selective call signals; a decoder, responsive to the selective call signals, for generating an alert signal in response thereto; and a piezoelectric resonant vibrator, comprising a resonant armature having a centrally located weight, and including a plurality of planar spring members for providing a restoring force normal to the movement of the weighted armature, and an actuator means, coupled to said armature and responsive to the alert signal, for inducing movement of said armature at a predetermined resonant frequency to provide the vibrating alert.
References Cited (Backward Citations)
CA855821A
Cited
US1882394A
Cited
US2144343A
Cited
US4132910A
Cited
US4439640A
Cited
US4720710A
Cited
US4491759A
Cited
US4918438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |