(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2011/0181131 A1
`PU
`(43) Pub. Date:
`Jul. 28, 2011
`
`US 2011 0181131A1
`
`(54) FLAT VIBRATING MOTOR
`
`Publication Classification
`
`(76) Inventor:
`
`Yong-Hua PU, Shenzhen (CN)
`
`(21) Appl. No.:
`
`12/978,567
`
`(22) Filed:
`(30)
`
`Dec. 26, 2010
`Foreign Application Priority Data
`
`Jan. 25, 2010 (CN) ......................... 2O102O103,774.4
`
`51) Int. C.
`(2006.01)
`(51) lik 33/06
`(52) U.S. Cl. .......................................................... 31 O/28
`(57)
`ABSTRACT
`A flat vibrating motor is disclosed. The flat vibrating motor
`includes a housing having a base and a cover, a magnet
`assembly suspended inside the housing, and a coil positioned
`right below the magnet assembly. A magnetic conductive
`plate is located between the coil and the base.
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`Patent Application Publication
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`Jul. 28, 2011 Sheet 1 of 2
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`US 2011/O181131 A1
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`43
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`" El 17
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`141
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`FIG. 2
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`Patent Application Publication
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`Jul. 28, 2011 Sheet 2 of 2
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`US 2011/O181131 A1
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`US 2011/O181131 A1
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`Jul. 28, 2011
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`FLATVIBRATING MOTOR
`
`FIELD OF THE INVENTION
`0001. The present invention generally relates to the art of
`vibrators and, more particularly, to a flat vibrating motor for
`generating tactile sensation.
`
`DESCRIPTION OF RELATED ARTS
`0002 Consumer products, such as mobile phones and por
`table multi-media players, generally include vibrators for
`generating tactile feedback. For example, a mobile phone has
`a vibrator for generating vibration while a call is called in, and
`a portable multi-media player has a touch screen having
`vibrators for getting tactile feedback.
`0003 Generally, the flat vibrating motor comprises a
`cover, a base forming a receiving cavity together with the
`cover, a coil located on the base, an elastic member coupled to
`the base, and a vibrating unit Suspended in the receiving
`cavity by the elastic member. The vibrating unit typically
`includes a magnet and a weight attached to the magnet. The
`coil is positioned right below the magnet.
`0004. In order to increase vibration amplitude of the flat
`vibrating motor, height of the coil or magnetic degree of the
`magnet is accordingly designed to be increased. However,
`increasing of the height of the coil or magnetic degree of the
`magnet will make the Volume of the motor increased. So, it is
`necessary to provide a new vibrator for solving the problem
`mentioned above.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`0005 FIG. 1 is an isometric view of a flat vibrating motor
`in accordance with an exemplary embodiment of the present
`invention;
`0006 FIG. 2 is a top view of the flat vibrating motor in
`FIG. 1, a cover thereof being removed; and
`0007 FIG. 3 is a cross-sectional view of the flat vibrating
`motor in FIG. 1.
`
`DETAILED DESCRIPTION OF THE
`EXEMPLARY EMBODIMENT
`0008 Reference will now be made to describe an exem
`plary embodiment of the present invention in detail.
`0009 Generally, a flat vibrating motor is mounted on a
`printed circuit board of an electronic device. Such as a mobile
`phone, for generating tactile vibration. Referring to FIGS.
`1-3, a flat vibrating motor, in accordance with the exemplary
`embodiment of the present invention, includes a cover 15, and
`a base 14 forming a receiving space together with the cover
`15. The cover 15 and the base 14 corporately form a housing
`having the receiving space. The housing accommodates an
`annular coil 13, a plurality of elastic members 16, a weight 17,
`and a magnet assembly 19 in the receiving space.
`0010. The base 14 further defines a bottom wall 141 and a
`plurality of sidewalls 142 extending vertically from the bot
`tom wall 141. The magnet assembly 19 is at least partially
`received in the weight 17, and the combination of the weight
`17 and the magnet assembly 19 is served as a moving unit. In
`fact, the weight 17 is used to enhance the vibrating amplitude
`of the moving unit. A sole magnet assembly without the
`weight can also be regarded as a moving unit. While
`assembled, the coil 13 is located right below the magnet
`assembly 19. Each of the elastic members 16 is received in the
`receiving space with one end positioned on the sidewall 142
`
`of the base 14 and a spring arm connected to the moving unit.
`Thus, the moving unit is Suspended in the receiving space by
`the elastic members 16. When electrified, the moving unit
`vibrates along a direction paralleled to the bottom wall 141 of
`the base 14. In the exemplary embodiment, the elastic mem
`bers 16 are connected to the weight 17 for suspending the
`moving unit in the receiving space. However, in fact, when the
`magnet assembly solely serves as a moving unit, the elastic
`members 16 can also be directly connected to the magnet
`assembly, by which the magnet assembly is suspended in the
`receiving space for being capable of vibrating along the direc
`tion parallel to the bottom wall 141 of the base 14.
`0011. The weight 17 defines a through hole in a middle
`portion thereof for receiving the magnet assembly 19 therein.
`It is illustrated in the exemplary embodiment that the magnet
`assembly 19 has a first magnet part 11 and a second magnet
`part 12, and the through hole of the weight 17 includes a first
`hole and a second hole for receiving the first and second
`magnet parts, respectively. The first magnet part 11 has mag
`netic poles opposite to those of the second magnet part 12, as
`shown in FIG. 3. Planes of magnetic poles of the magnet
`assembly 16 are parallel and face to the bottom wall 141 and
`are also parallel to the coil 13. Thus, the magnet assembly 19,
`together with the weight 17, is suspended in the receiving
`space by the elastic members 16. The annular coil 13 being
`located right below the first magnet part 11 and the second
`magnet part 12. For reducing magnetic flux leakage and
`increasing the magnetic flux through the coil, a magnetic
`conductive plate 18 is located between the coil 13 and the
`bottom wall 141. The magnetic conductive plate 18 defines a
`top Surface parallel to and abutting against the coil 13, and a
`lower Surface parallel to and abutting against the base 14.
`0012. When the coil 13 is electrified, the moving unit is
`forced to move along a direction parallel to the bottom wall
`141 by electro-magnetic force, i.e., the Lorentz force. The
`coil 13 is positioned on the magnetic conductive plate 18
`positioned on the base 14.
`0013 The magnetic conductive plate 18 reduces magnetic
`flux leakage through the coil 13, and effectively strengthens
`vibration of the flat vibrating motor 1. For widening the band
`width of responding frequency of the motor, a magnetic fluid
`20 is attracted to a bottom of the magnet assembly 19. Friction
`exists between the magnetic fluid 20 and a top surface of the
`coil 13 during the vibration of the moving unit.
`0014 While the present invention has been described with
`reference to a specific embodiment, the description of the
`invention is illustrative and is not to be construed as limiting
`the invention. Various of modifications to the present inven
`tion can be made to the exemplary embodiment by those
`skilled in the art without departing from the true spirit and
`Scope of the invention as defined by the appended claims.
`
`What is claimed is:
`1. A flat vibrating motor, comprising:
`a cover,
`a base forming a housing together with the cover, the base
`defining a bottom wall;
`a magnet assembly suspended in the housing and being
`capable of vibrating along a direction parallel to the
`bottom wall of the base;
`a number of elastic members suspending the magnet
`assembly in the housing:
`a coil located below the magnet assembly and positioned
`above the bottom wall of the base;
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`US 2011/O181131 A1
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`Jul. 28, 2011
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`a magnetic conductive plate positioned between the coil
`and bottom wall of the base for reducing magnetic flux
`leakage.
`2. The flat vibrating motor as described in claim 1, wherein
`the magnetic conductive plate defines a top Surface parallel to
`and abutting against the coil and a lower Surface parallel to
`and abutting against the bottom wall of the base.
`3. The flat vibrating motor as described in claim 1, wherein
`the magnet assembly has a first magnet part and a second
`magnet part separately, and the magnetic poles of first magnet
`part are opposite to the magnetic poles of second magnet part.
`4. The flat vibrating motor as described in claim 1 further
`comprising a weight defining a through hole for accommo
`dating the magnet assembly therein.
`5. The flat vibrating motor as described in claim 1 further
`comprising a magnetic fluid attracted to a bottom of the
`magnet assembly for rubbing the coil.
`
`6. A flat vibrating motor, comprising:
`a cover,
`a base forming a housing together with the cover, the hous
`ing forming a receiving space;
`a plurality of elastic members accommodated in the receiv
`ing space;
`a moving unit Suspended in the housing by the elastic
`members;
`a magnetic conductive plate positioned on the base; and
`a coil located on the magnetic conductive plate and posi
`tioned between the moving unit and the magnetic con
`ductive plate.
`7. The flat vibrating motor as described in claim 6 further
`comprising a magnetic fluid located between a bottom of the
`moving unit and a top of the coil, and friction exists between
`the magnetic fluid and the coil.
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