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KR101526277B1 - Linear actuator - Google Patents

Linear actuator Download PDF

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KR101526277B1
KR101526277B1 KR1020090006566A KR20090006566A KR101526277B1 KR 101526277 B1 KR101526277 B1 KR 101526277B1 KR 1020090006566 A KR1020090006566 A KR 1020090006566A KR 20090006566 A KR20090006566 A KR 20090006566A KR 101526277 B1 KR101526277 B1 KR 101526277B1
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deformable member
linear actuator
driven body
deformable
housing
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KR20100087518A (en
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김현오
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엘지이노텍 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/206—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using only longitudinal or thickness displacement, e.g. d33 or d31 type devices

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Lens Barrels (AREA)

Abstract

선형 액츄에이터가 개시된다. 상기 선형 액츄에이터는 피동체가 결합되는 변형부재의 부위가 돌출되므로, 돌출부 외측의 부위를 활용할 수 있다. 그러므로, 활용할 수 있는 공간이 넓으므로 선형 액츄에이터의 부피를 줄일 수 있다. 또한, 변형부재의 돌출부에 피동체가 결합되므로, 피동체가 선형운동하여도 변형부재의 간섭을 받지 않는다. 따라서, 피동체의 형상에 관계 없이 사용할 수 있다.A linear actuator is disclosed. Since the portion of the deformable member to which the driven body is coupled protrudes from the linear actuator, a portion outside the protruding portion can be utilized. Therefore, since the space available is wide, the volume of the linear actuator can be reduced. Further, since the driven body is engaged with the projecting portion of the deformable member, even if the driven body linearly moves, it is not affected by the deformable member. Therefore, it can be used regardless of the shape of the driven body.

Description

선형 액츄에이터 {LINEAR ACTUATOR}[0001] LINEAR ACTUATOR [0002]

본 발명은 선형 액츄에이터에 관한 것이다.The present invention relates to a linear actuator.

도 1은 종래의 선형 액츄에이터의 단면도로서, 이를 설명한다.Fig. 1 is a cross-sectional view of a conventional linear actuator. Fig.

도시된 바와 같이, 상하면에 출입공(11a)이 각각 형성된 하우징(11)이 마련된다. 출입공(11a) 외측의 하우징(11)의 상면 및 하면에는 전기 중합체(Electric Polymer)로 형성된 제 1 및 제 2 수축막(13,15)의 테두리부측이 각각 고정된다. 제 1 수축막(13)의 중앙부측과 제 2 수축막(15)의 중앙부측은 연결부재(17)에 의하여 상호 결합되고, 연결부재(17)에는 카메라의 경통 등과 같은 피동체(20)가 결합된다.As shown in the figure, a housing 11 having an entrance hole 11a formed in the upper and lower surfaces thereof is provided. The rim portions of the first and second shrink films 13 and 15 formed of an electric polymer are respectively fixed to the upper and lower surfaces of the housing 11 outside the access hole 11a. The center portion side of the first shrinking film 13 and the center portion side of the second shrinking film 15 are coupled to each other by the connecting member 17 and the moving body 20 such as a camera lens barrel is coupled to the connecting member 17 do.

그리하여, 제 1 수축막(13)에 전류를 인가하여 가열하면, 제 1 수축막(13)이 수축된다. 그런데, 제 1 수축막(13)의 수축으로 인하여, 연결부재(17)가 결합된 제 1 수축막(13)의 중앙부측은, 제 1 수축막(13)의 중앙부측에 대하여, 수직으로 상승한다. 그러면, 피동체(20)가 수직으로 상승한다.Thus, when the current is applied to the first shrinking film 13 and heated, the first shrinking film 13 is shrunk. Due to the shrinkage of the first shrink film 13, the center portion side of the first shrink film 13 to which the connecting member 17 is coupled rises vertically with respect to the center portion side of the first shrink film 13 . Then, the driven body 20 is lifted vertically.

그리고, 피동체(20)가 상승된 상태에서, 제 1 수축막(13)으로 공급되는 전류를 차단하고 제 2 수축막(15)에 전류를 인가하여 가열하면, 제 2 수축막(15)이 수 축된다. 그런데, 제 2 수축막(15)의 수축으로 인하여, 연결부재(17)가 결합된 제 2 수축막(15)의 중앙부측은, 제 2 수축막(15)의 중앙부측에 대하여, 수직으로 하강한다. 그러면, 피동체(20)가 수직으로 하강한다.When the current supplied to the first shrink film 13 is blocked and the current is applied to the second shrink film 15 in the state where the driven body 20 is lifted and the current is supplied to the second shrink film 15, . Due to the contraction of the second shrinking film 15, the central portion side of the second shrinking film 15 to which the connecting member 17 is coupled falls vertically with respect to the center portion side of the second shrinking film 15 . Then, the driven body 20 descends vertically.

즉, 제 1 및 제 2 수축막(13,15)의 수축에 의하여 피동체(20)가 선형적으로 운동하는 것이다.In other words, the first and second shrinking membranes 13 and 15 are contracted to linearly move the driven body 20.

상기와 같은 종래의 선형 액츄에이터는 제 1 및 제 2 수축막(13,15)의 중앙부측에 결합된 연결부재(17)가 제 1 수축막(13)의 테두리측 보다는 하측에 위치되고, 제 2 수축막(15)의 테두리부측 보다는 상측에 위치된다. 이로인해, 연결부재(17) 외측의 제 1 및 제 2 수축막(13,15) 부위의 공간이 사장되므로, 상대적으로 부피가 커지는 단점이 있다.In the conventional linear actuator as described above, the connecting member 17 coupled to the center portion side of the first and second shrinking membranes 13 and 15 is positioned below the rim side of the first shrinking membrane 13, Is located on the upper side of the rim portion side of the shrinking film (15). As a result, the spaces of the first and second shrinking membranes 13 and 15 outside the connecting member 17 are obsolete, which leads to a relatively large volume.

또한, 피동체(20)가 연결부재(17) 외측의 제 1 및 제 2 수축막(13,15) 부위와 간섭하지 않도록 피동체(20)를 설계하여야 하므로, 피동체(20)의 형상에 제약이 있다.Since the driven body 20 must be designed so that the driven body 20 does not interfere with the portions of the first and second shrinking films 13 and 15 outside the connecting member 17, There are restrictions.

본 발명은 상기와 같은 종래 기술의 문제점을 해소하기 위하여 안출된 것으로, 본 발명의 목적은 부피를 줄일 수 있는 선형 액츄에이터를 제공함에 있다.SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a linear actuator capable of reducing the volume.

본 발명의 다른 목적은 피동체의 형상에 제약 없이 사용할 수 있는 선형 액츄에이터를 제공함에 있다.Another object of the present invention is to provide a linear actuator which can be used without restriction on the shape of a driven body.

상기 목적을 달성하기 위한 본 발명에 따른 선형 액츄에이터는, 하우징; 상기 하우징에 지지되며 가열되면 수축되는 수축부재; 상기 수축부재에 결합되어 상기 수축부재의 수축에 의하여 변형되며, 가열되면 최초의 상태로 복귀되면서 피동체를 선형 운동시키는 변형부재를 포함한다.According to an aspect of the present invention, there is provided a linear actuator including: a housing; A shrinking member supported by the housing and contracted when heated; And a deformable member coupled to the shrinkable member and deformed by contraction of the shrinkable member and linearly moving the moved member when the shrinkable member is returned to its original state when heated.

본 발명에 따른 선형 액츄에이터는 피동체가 결합되는 변형부재의 부위가 돌출되므로, 돌출부 외측의 부위를 활용할 수 있다. 그러므로, 활용할 수 있는 공간이 넓으므로 선형 액츄에이터의 부피를 줄일 수 있다.Since the linear actuator according to the present invention protrudes the portion of the deformable member to which the driven body is coupled, a portion outside the protruding portion can be utilized. Therefore, since the space available is wide, the volume of the linear actuator can be reduced.

또한, 변형부재의 돌출부에 피동체가 결합되므로, 피동체가 선형운동하여도 변형부재의 간섭을 받지 않는다. 따라서, 피동체의 형상에 관계 없이 사용할 수 있다.Further, since the driven body is engaged with the projecting portion of the deformable member, even if the driven body linearly moves, it is not affected by the deformable member. Therefore, it can be used regardless of the shape of the driven body.

이하, 첨부된 도면을 참조하여 본 발명의 일 실시예에 따른 선형 액츄에이터를 상세히 설명한다.Hereinafter, a linear actuator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 따른 선형 액츄에이터의 단면도이다.2 is a cross-sectional view of a linear actuator according to an embodiment of the present invention.

도시된 바와 같이, 사각통 또는 원통 형상으로 형성된 하우징(110)이 마련되고, 하우징(110)의 상면 중앙부측에는 출입공(111)이 형성된다.As shown in the figure, a housing 110 formed in a rectangular or cylindrical shape is provided, and an access hole 111 is formed at the center of the upper surface of the housing 110.

출입공(111) 외측의 하우징(110)의 일면 부위에는 전류가 인가되어 가열되면 수축되는 전기 중합체(Electric Polymer)로 형성된 수축부재(120)의 테두리부측이 결합된다. 수축부재(120)의 중앙부측에는 관통공(121)이 형성된다.A rim portion of a shrinkable member 120 formed of an electric polymer that is contracted when an electric current is applied when the electric current is applied is coupled to a portion of the housing 110 outside the access hole 111. A through hole 121 is formed at the center of the shrinkable member 120.

관통공(121)측 수축부재(120)의 부위에는 전류가 인가되어 가열되면 최초의 상태로 복귀하는 형상기억합금(Shape Memory Alloy)으로 형성된 변형부재(130)의 테두리부측이 결합된다.The edge of the deformable member 130 formed of a shape memory alloy, which is returned to its initial state when a current is applied and is heated, is coupled to a portion of the constrictive member 120 on the through hole 121 side.

즉, 변형부재(130)는 수축부재(120)의 수축에 의하여 변형되었다가, 가열되면 최초의 상태로 복귀된다. 변형부재(130)의 중앙부측은 돌출(131)되어 출입공(111)측으로 돌출되며, 돌출부(131)는 변형부재(130)가 변형→복귀함에 따라 선형적으로 운동한다. 돌출부(131)에는 가동시키고자 하는 카메라의 경통 등과 같은 피동체(200)가 결합된다.That is, the deformable member 130 is deformed by the contraction of the contractible member 120, and is returned to the initial state when it is heated. The central portion of the deformable member 130 is protruded to protrude toward the access hole 111 and the protruding portion 131 moves linearly as the deformable member 130 deforms. A movable body 200 such as a lens barrel of a camera to be operated is coupled to the projection 131.

형상기억합금은 변형되어도 가열하면 변형 전의 형태로 되돌아가는 성질이 있다. 이는 모상(母相)에서 형성된 합금이 다른 상에 있을 때 변형되더라도, 모상으로 되돌리면 형상이 다시 원래로 되돌아가는 성질을 가졌기 때문이다. 형상기억합금은 큰 탄성(彈性)과 뛰어난 진동흡수성의 특성이 있다.Even if the shape memory alloy is deformed, the shape memory alloy has a property of returning to a shape before deformation. This is because, even if the alloy formed in the parent phase is deformed when it is in another phase, the shape returns to its original shape when it is returned to the parent phase. Shape memory alloys are characterized by large elasticity and excellent vibration absorbing properties.

수축부재(120)와 변형부재(130)는 연결부재(140)에 의하여 상호 결합된다.The shrinking member 120 and the deformable member 130 are coupled to each other by the connecting member 140.

상기와 같이 구성된 본 실시예에 따른 선형 액츄에이터의 동작을 설명한다.The operation of the linear actuator according to this embodiment will be described.

최초의 상태에서, 수축부재(120)에 전류를 인가하여 가열하면, 수축부재(120)가 수축된다. 그러면, 수축부재(120)의 수축에 의하여 변형부재(130)가 변형된다. 이때, 변형부재(130)의 돌출부(131)는, 도 2에 점선으로 도시된 바와 같이, 하우징(110)의 내측으로 하강하는 형태로 선형 운동한다. 그러면, 피동체(200)도 하강하는 것이다.In the initial state, when the current is applied to the constriction member 120 and heated, the constriction member 120 is contracted. Then, the deformable member 130 is deformed by the contraction of the constrictive member 120. At this time, the projecting portion 131 of the deformable member 130 linearly moves in a downward direction toward the inside of the housing 110, as shown by a dotted line in FIG. Then, the driven body 200 also descends.

변형부재(130)가 변형된 상태에서 수축부재(120)로 공급되는 전류를 차단하 고, 변형부재(130)로 전류를 인가하면, 변형부재(130)는 최초의 상태로 복귀된다. 그러면, 변형부재(130)의 돌출부(131)는 하우징(110)의 외측으로 상승하는 형태로 선형 운동한다. 그러면, 피동체(200)도 상승하는 것이다.When the deformable member 130 is deformed, the current supplied to the constrictive member 120 is blocked, and when the current is applied to the deformable member 130, the deformable member 130 returns to the initial state. Then, the projecting portion 131 of the deformable member 130 linearly moves in the form of rising toward the outside of the housing 110. Then, the driven body 200 also ascends.

피동체(200)의 운동 거리는 수축부재(120)의 가열정도를 적정하게 조절하여 수축부재(120)의 수축 정도를 조절하면 된다.The degree of shrinkage of the shrinkable member 120 may be adjusted by appropriately adjusting the degree of heating of the shrinkable member 120 with respect to the moving distance of the driven member 200.

본 실시예에 따른 선형 진동기는 피동체(200)가 결합되는 변형부재(130)의 부위가 돌출(131)되므로, 돌출부(131) 외측의 부위를 활용할 수 있다. 그러므로, 선형 액츄에이터의 부피를 줄일 수 있다.Since the portion of the deformable member 130 to which the driven body 200 is coupled is protruded 131, the portion of the linear vibrator according to the present embodiment outside the protruding portion 131 can be utilized. Therefore, the volume of the linear actuator can be reduced.

또한, 변형부재(130)의 돌출부(131)에 피동체(200)가 결합되므로, 피동체(200)는 변형부재(130)의 간섭을 받지 않는다. 따라서, 피동체(200)의 형상에 관계 없이 사용할 수 있다.Since the driven member 200 is engaged with the projecting portion 131 of the deformable member 130, the driven member 200 is not affected by the deformable member 130. Therefore, it can be used regardless of the shape of the driven body 200.

이상에서는, 본 발명의 일 실시예에 따라 본 발명을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 변경 및 변형한 것도 본 발명에 속함은 당연하다.While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Of course.

도 1은 종래의 선형 액츄에이터의 단면도.1 is a sectional view of a conventional linear actuator;

도 2는 본 발명의 일 실시예에 따른 선형 액츄에이터의 단면도.2 is a cross-sectional view of a linear actuator according to one embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Description of the Related Art [0002]

110 : 하우징 120 : 수축부재110: housing 120: shrinkable member

130 : 변형부재 140 : 연결부재130: deformable member 140: connecting member

Claims (6)

하우징;housing; 테두리부 측이 상기 하우징에 지지되며, 가열되면 수축되는 수축부재;A shrinking member which is supported by the housing at its rims and contracts when heated; 상기 수축부재의 중앙부 측과 결합하여 상기 수축부재의 수축에 의해 변형되며, 가열되면 변형 전의 상태로 복귀되는 변형부재를 포함하는 선형 액츄에이터.And a deformable member that is engaged with a center portion side of the shrinkable member and is deformed by shrinkage of the shrinkable member and returns to a state before deformation when heated. 제 1 항에 있어서,The method according to claim 1, 상기 하우징의 일면에는 상기 변형부재가 출입하는 출입공이 형성되고,Wherein the housing has an inlet / outlet hole through which the deformable member is inserted / 상기 변형부재의 중앙부 측에는 상기 출입공 측으로 돌출되는 돌출부가 형성되며,A protruding portion protruding toward the entry / exit hole is formed at a center portion side of the deformable member, 상기 돌출부에는 상기 변형부재의 변형과 연동하는 피동체가 결합되는 선형 액츄에이터.And the movable body coupled with the deformation of the deformable member is engaged with the protruding portion. 제 1 항에 있어서,The method according to claim 1, 상기 수축부재와 상기 변형부재는 연결부재에 의하여 상호 결합하는 선형 액츄에이터.Wherein the shrinkable member and the deformable member are mutually coupled by a connecting member. 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,4. The method according to any one of claims 1 to 3, 상기 수축부재는 전기 중합체(Electric Polymer)로 형성되는 선형 액츄에이터.Wherein the shrinkable member is formed of an electric polymer. 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,4. The method according to any one of claims 1 to 3, 상기 변형부재는 형상기억합금(Shape Memory Alloy)으로 형성되는 선형 액츄에이터.Wherein the deformable member is formed of a shape memory alloy. 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,4. The method according to any one of claims 1 to 3, 상기 가열은 상기 수축부재 및 상기 변형부재 각각에 대해 전류를 인가함으로써 이루어지는 선형 액츄에이터.Wherein the heating is performed by applying an electric current to each of the shrinking member and the deforming member.
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JPH0670429B2 (en) * 1985-04-03 1994-09-07 時枝 直満 Linear motion type actuator
US20060197405A1 (en) * 2005-03-04 2006-09-07 Usa As Represented By The Administrator Of The National Aeronautics And Space Administration Hybrid elecromechanical actuator and actuation system
KR100714550B1 (en) * 2005-12-09 2007-05-07 삼성전기주식회사 Driving device for electroactive polymer actuator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0670429B2 (en) * 1985-04-03 1994-09-07 時枝 直満 Linear motion type actuator
US20060197405A1 (en) * 2005-03-04 2006-09-07 Usa As Represented By The Administrator Of The National Aeronautics And Space Administration Hybrid elecromechanical actuator and actuation system
KR100714550B1 (en) * 2005-12-09 2007-05-07 삼성전기주식회사 Driving device for electroactive polymer actuator

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