Source: https://patents.justia.com/patent/10610894
Timestamp: 2020-06-01 14:20:08
Document Index: 264566150

Matched Legal Cases: ['Application No. 2017', 'art 10', 'art 20', 'art) 33', 'art 10', 'art 10', 'art 20', 'art 10', 'art 20', 'art 33', 'art 20', 'art 33', 'art 10', 'art 33', 'art 33', 'art 10']

US Patent for Vibration actuator and portable device Patent (Patent # 10,610,894 issued April 7, 2020) - Justia Patents Search
Justia Patents Reed TypeUS Patent for Vibration actuator and portable device Patent (Patent # 10,610,894)
A vibration actuator includes: a movable part including a coil; a fixing part including a magnet; and an elastic supporting part supporting the movable part such that the movable part is movable to the fixing part. The movable part reciprocates to the fixing part in a vibrating direction by interaction between the coil and the magnet. The magnet includes a first magnet and a second magnet joined to each other such that their magnetization directions are opposite to each other, and the magnet is disposed to be radially inwardly spaced apart from the coil. The elastic supporting part is fixed at its one end to the fixing part and at its other end to the movable part. The elastic supporting part has a structure for cantilevering the movable part. At least one of the first and the second magnets includes a depressed portion in its joining surface.
This application is entitled to and claims the benefit of Japanese Patent Application No. 2017-222021, filed on Nov. 17, 2017 and the disclosure of which including the specification, drawings and abstract is incorporated herein by reference in its entirety.
A vibration actuator according to the present invention includes: a movable part including a coil; a fixing part including a magnet; and an elastic supporting part configured to support the movable part such that the movable part is movable to the fixing part, the movable part being configured to reciprocate with respect to the fixing part in a vibrating direction by interaction between the coil and the magnet. In the vibration actuator, the magnet includes a first magnet and a second magnet joined to each other such that their magnetization directions are opposite to each other, the magnet being disposed to be radially inwardly spaced apart from the coil, the elastic supporting part is fixed to the fixing part at one end of the elastic supporting part and to the movable part at the other end of the elastic supporting part, the elastic supporting part has a structure for cantilevering the movable part, and at least one of the first and the second magnets includes a depressed portion in its joining surface.
( Equation ⁢ ⁢ 1 ) ⁢ f r = 1 2 ⁢ ⁢ π ⁢ K sp J [ 1 ]
( Equation ⁢ ⁢ 2 ) ⁢ J ⁢ ⁢ d 2 ⁢ θ ⁡ ( t ) dt 2 = K t ⁢ i ⁡ ( t ) - K sp ⁢ θ ⁡ ( t ) - D ⁢ ⁢ d ⁢ ⁢ θ ⁢ ( t ) dt [ 2 ]
( Equation ⁢ ⁢ 3 ) ⁢ e ⁡ ( t ) = R i ⁡ ( t ) + L ⁢ ⁢ di ⁡ ( t ) dt + K e ⁢ d ⁢ ⁢ θ ⁢ ( t ) dt [ 3 ]
e(t): Voltage [V]
As described above, vibration actuator 1 according to the present embodiment includes: movable part 10 including coil 11; fixing part 20 including magnet 21; and plate spring part (elastic supporting part) 33 configured to support movable part 10 such that movable part 10 is movable to fixing part 20. Movable part 10 is configured to reciprocate with respect to fixing part 20 in a vibrating direction by interaction between coil 11 and magnet 21. Magnet 21 includes first magnet 211 and second magnet 212 joined to each other by an adhesive such that their magnetization directions are opposite to each other, and magnet 21 is disposed to be radially inwardly spaced apart from coil 11. Plate spring part 33 is fixed to fixing part 20 at one end of plate spring part 33 and to movable part 10 at the other end of plate spring part 33. Plate spring part 33 has a structure in which movable part 10 is cantilevered. First and second magnets 211 and 212 include depressed portions 211a and 212a in their joining surfaces.
According to vibration actuator 1, sufficient physically-felt vibration can be given to a user without enlargement of vibration actuator 1. In addition, depressed portions 211a and 212a are formed in the joining surfaces of first and second magnets 211 and 212, so that depressed portions 211a and 212a serve as a resin pit, thereby making an adhesion area greater to increase the adhesive strength. Accordingly, the impact resistance is improved and the reliability increases. Additionally, adhesive oozing is reduced and, thus, the workability is also improved. Moreover, depressed portions 211a and 212a can also be used as markings for identifying the magnetization directions of first and second magnets 211 and 212.
a movable part including a coil;
a fixing part including a magnet; and
the magnet includes a first magnet and a second magnet joined to each other such that their magnetization directions are opposite to each other, the magnet being disposed to be radially inwardly spaced apart from the coil,
the elastic supporting part is fixed to the fixing part at one end of the elastic supporting part and to the movable part at the other end of the elastic supporting part, the elastic supporting part having a structure for cantilevering the movable part, and
at least one of the first and the second magnets includes a depressed portion in a joining surface of the at least one of the first and the second magnets.
2. The vibration actuator according to claim 1, wherein the depressed portion is a cross-shaped groove.
3. The vibration actuator according to claim 1, wherein the depressed portion is a linear groove.
4. The vibration actuator according to claim 1, wherein the first and the second magnets are joined to each other by an adhesive, and the adhesive is an ultraviolet-curable, thermosetting, or anaerobically-curable adhesive.
5. The vibration actuator according to claim 4, wherein the adhesive is the thermosetting adhesive based on an epoxy resin.
9815085 November 14, 2017 Chun
20140152126 June 5, 2014 Kim
20180021812 January 25, 2018 Akanuma
20190151894 May 23, 2019 Takahashi
Patent number: 10610894
Patent Publication Number: 20190151896
Application Number: 16/194,416