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WO1995001622A1 - Vibreur magnetique - Google Patents

Vibreur magnetique Download PDF

Info

Publication number
WO1995001622A1
WO1995001622A1 PCT/US1994/006155 US9406155W WO9501622A1 WO 1995001622 A1 WO1995001622 A1 WO 1995001622A1 US 9406155 W US9406155 W US 9406155W WO 9501622 A1 WO9501622 A1 WO 9501622A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
vibrator
magnet
spring
casing
Prior art date
Application number
PCT/US1994/006155
Other languages
English (en)
Inventor
Douglas Fitzpatrick
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Priority to AU72441/94A priority Critical patent/AU7244194A/en
Publication of WO1995001622A1 publication Critical patent/WO1995001622A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B6/00—Tactile signalling systems, e.g. personal calling systems

Definitions

  • This invention relates generally to radio communications devices, and more particularly to non-audible annunciators.
  • Vibrators exist in the art, and one such prior art vibrator comprises a motor with an off-centered weight that vibrates when an electrical current is applied to the motor. When used as a non-audible annunciator, the vibrator passes on the vibrations to a user as a tactile sensory stimulus.
  • Radio communication devices such as pagers and two-way radios, have many operating features. These radio communication devices are typically powered by batteries, and therefore are limited to operating for a certain duration only. Hence, a continual need exists for radio communication devices to use energy efficient components (such as vibrators), in order to conserve energy so as to prolong their operating duration.
  • energy efficient components such as vibrators
  • FIG. 1 is a cross-sectional view of a prior art vibrator.
  • FIG. 2 is a cross-sectional view of a vibrator in accordance with the present invention.
  • FIG. 3 is a block diagram of a communication device in accordance with the present invention. Detailed Description of a Preferred Embodiment
  • FIG. 1 illustrates a prior art vibrator (10) that comprises a coil (12) fixed to a casing (11), a permanent magnet (13) disposed in an iron core (14) and movable, together with the iron core (14), in a substantially vertical direction within the casing (11 ), and a circular leaf spring (15) coupled to the casing (11).
  • the coil (12) is indicated with a diameter (19).
  • Two flux paths (16 and 17), the coil (12), the magnet (13), and the iron core (14) forms a magnetic circuit.
  • a third flux path (18) is also indicated that goes through the casing (11 ).
  • the directions of a current applied to the coil (12) and that of the flux path (17) determine the direction of a resultant force vector (this resultant force vector is explained below).
  • the above vibrator (10) operates according to the principles of electromagnetic flux theory and mechanics. Basically, the following four equations are relevant to the vibrator's (10) operations.
  • a first relevant equation is as follows:
  • Fe i(l xB) - Equation 1
  • Fe is the resultant force vector
  • i is the magnitude of the current
  • 1 is a vector indicating the direction of the current on the coil (12) and the magnitude of the coil's (12) total length
  • B is the magnetic flux density vector at the coil (12).
  • Equation 1 relates the resultant force vector (Fe) to the current (i), the coil (12), and the magnetic flux density (B) at the coil (12).
  • This resultant force vector (Fe) provides an excitation force that overcomes the frictional losses within the vibrator (10) and, in addition, moves a weight (comprising primarily the magnet (13) and the iron core (14)) from a resting equilibrium to an oscillating steady state.
  • the vibrator (10) will oscillate at a frequency that depends on the weight's mass and on a spring's (15) constant. This frequency relates to the mass and the spring's (15) constant by the following equation:
  • w 0 is the resonant frequency predetermined by a designer (for a good tactile stimulus w 0 a 2P (90Hz))
  • k is the spring's (15) constant
  • m is the mass of the weight.
  • the actual vibration force of the vibrator (10) is related to the mass (m) of the weight and a maximum acceleration of this weight at steady state.
  • the vibration force is determined by a third relevant equation as follows:
  • x 0 is a displacement of the weight from a predetermined reference point
  • w 0 is the resonant frequency as mentioned in Equation 2
  • t is time in seconds.
  • FIG. 2 an embodiment of a vibrator (20) in accordance with the present invention shows parts with similar functions to those in FIG. 1 , such as a coil (21 ), a metal disc (22), a metal cup (23), and a permanent magnet (24).
  • the two magnets (13 and 24), in FIGs. 1 and 2 respectively, are disposed and shaped differently (the magnet (24) is partially disposed within the coil (21)).
  • FIG. 2 also shows two flux paths (25 and 26) that form a magnetic circuit together with the four parts above (the coil (21 ), the disc (22), the cup (23), and the magnet (24)).
  • the vibrator (20) functions somewhat similarly to the prior art vibrator
  • the coil (21) in the magnetic vibrator (20) has a larger diameter (27) than the prior art coil's (12) diameter (19).
  • the coil (21 ) is longer than the prior art coil (12).
  • This longer coil (21) increases the resultant force vector (Fe), assuming the current (i) and the magnetic flux density (B) remains the same.
  • the disposition of the coil (21), the disc (22), the cup (23), and the magnet (24) provides the two flux paths (25 and 26) that have a lower reluctance compared to the prior art vibrator's (10) flux path (17).
  • Both flux paths (25 and 26) couple to the magnet (24); the first low reluctance flux path (25) is disposed exterior to the coil (21), and the second low reluctance flux path (26) is disposed within the coil (21).
  • reluctance is a characteristic of a magnetic circuit that determines the magnetic flux density (B). Generally, a lower reluctance will provide a better magnetic flux density (B).
  • the vibrator (20) better utilizes the magnet (24) by providing a magnetic circuit with a lesser flux leakage.
  • the magnetic flux path (18) is a leakage path that does not contribute to the resultant force vector (Fe)).
  • the magnetic flux path (18) is a leakage path that does not contribute to the resultant force vector (Fe)).
  • B the magnetic flux density
  • Equations 1 , 2, 3, and 4 all affect the performance of the vibrator (10 or 20).
  • Equation 1 is an electromagnetic coupling equation that determines the maximum efficiency by relating the resultant force vector (Fe) to the current (i), the coil (12 or 21), and the magnetic flux density (B).
  • the communication device (30) comprises a radio receiver (31), a logic unit (32), a power source (33), and a vibrating annunciator (34).
  • the communication device (30) can be a pager, a radio telephone, or any other communication device (30) where some type of vibrating annunciation is used to alert a user of such devices when a predetermined signal is received.
  • the radio receiver (31 ) provides a signal to the logic unit (32) (for example a decoding unit in a pager) that then enables the power source (33) to provide the current to the vibrating annunciator (34) to initiate the oscillations of the magnetic vibrator (20).
  • the logic unit (32) for example a decoding unit in a pager
  • radio communication devices (30) will continue to reduce in size, especially when portability is a factor.
  • portable radio communication devices (30) are powered by batteries, and incorporate many operating features, including non-audible annunciators.
  • energy consumption becomes a prime consideration in battery- powered radio communication devices (30). Therefore, a need exists for radio communication devices (30) to use more efficient components, such as magnetic vibrating annunciators.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

Un vibreur magnétique fonctionnant comme un avertisseur dans un dispositif de communication radio est obtenu de la manière suivante. Le vibreur magnétique comprend: un aimant permanent (24), disposé en partie dans un enroulement (21) et fixé à un ressort (15), et deux éléments métalliques (22 et 23). Un courant, appliqué à l'enroulement, déclenche une force résultante qui agit sur l'aimant, le ressort et les deux éléments métalliques. Les oscillations obtenues de l'aimant, du ressort et des deux éléments métalliques passent dans un boîtier (11) comme des vibrations. Ces vibrations servent d'avertissement non audible en produisant des stimuli sensoriels tactiles à un utilisateur d'un dispositif de communication dans lequel l'avertisseur vibrant est incorporé.
PCT/US1994/006155 1993-06-30 1994-06-02 Vibreur magnetique WO1995001622A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72441/94A AU7244194A (en) 1993-06-30 1994-06-02 A magnetic vibrator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8523693A 1993-06-30 1993-06-30
US085,236 1993-06-30

Publications (1)

Publication Number Publication Date
WO1995001622A1 true WO1995001622A1 (fr) 1995-01-12

Family

ID=22190326

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/006155 WO1995001622A1 (fr) 1993-06-30 1994-06-02 Vibreur magnetique

Country Status (2)

Country Link
AU (1) AU7244194A (fr)
WO (1) WO1995001622A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044929A1 (fr) * 2001-11-22 2003-05-30 Matsushita Electric Industrial Co., Ltd. Actionneur lineaire vibrant
US11938096B1 (en) * 2017-10-27 2024-03-26 Bimla Picot Medication reminder device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4728934A (en) * 1982-03-10 1988-03-01 Siemens Aktiengesellschaft Tactile stimulation device for hearing-impaired individuals
US5107540A (en) * 1989-09-07 1992-04-21 Motorola, Inc. Electromagnetic resonant vibrator
US5172092A (en) * 1990-04-26 1992-12-15 Motorola, Inc. Selective call receiver having audible and tactile alerts
US5175459A (en) * 1991-08-19 1992-12-29 Motorola, Inc. Low profile vibratory alerting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4728934A (en) * 1982-03-10 1988-03-01 Siemens Aktiengesellschaft Tactile stimulation device for hearing-impaired individuals
US5107540A (en) * 1989-09-07 1992-04-21 Motorola, Inc. Electromagnetic resonant vibrator
US5172092A (en) * 1990-04-26 1992-12-15 Motorola, Inc. Selective call receiver having audible and tactile alerts
US5175459A (en) * 1991-08-19 1992-12-29 Motorola, Inc. Low profile vibratory alerting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044929A1 (fr) * 2001-11-22 2003-05-30 Matsushita Electric Industrial Co., Ltd. Actionneur lineaire vibrant
US6777895B2 (en) 2001-11-22 2004-08-17 Matsushita Electric Industrial Co., Ltd. Vibrating linear actuator
US11938096B1 (en) * 2017-10-27 2024-03-26 Bimla Picot Medication reminder device

Also Published As

Publication number Publication date
AU7244194A (en) 1995-01-24

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