[특허]Shape memory alloy actuation apparatus

[미국특허] Shape memory alloy actuation apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-005/228 H04N-005/225 G03B-013/00
출원번호	US-0525906 (2008-02-11)
등록번호	US-8446475 (2013-05-21)
우선권정보	GB-0702674.3 (2007-02-12); GB-0702676.8 (2007-02-12); GB-0707788.6 (2007-04-23); GB-0708214.2 (2007-04-27); GB-0709338.8 (2007-05-15); GB-0716469.2 (2007-08-23); GB-0718828.7 (2007-09-26)
국제출원번호	PCT/GB2008/000478 (2008-02-11)
§371/§102 date	20091113 (20091113)
국제공개번호	WO2008/099156 (2008-08-21)
발명자 / 주소	Topliss, Richard Webber, Dominic George Leedham, Robert John Hooley, Anthony Richards, David Charles William Gregory, Thomas Matthew
출원인 / 주소	Cambridge Mechatronics Limited
대리인 / 주소	Nixon & Vanderhye, P.C.
인용정보	피인용 횟수 : 17 인용 특허 : 18

초록 ▼

A miniature camera lens actuation apparatus comprises a support structure, a camera lens element supported on the support structure by a suspension system; and an SMA actuator connected between the support structure and the movable element to drive movement of the camera lens element. The control circuit may include a drive circuit and a sensor circuit which have separate electrical connections to the SMA actuator to reduce the impact of the resistance of the electrical connections on the sensing. The control circuit may vary the drive signal in response to a temperature signal indicative of the ambient temperature. An endstop limits movement to prevent extension of the SMA actuator in its unheated state beyond a maximum length which is at or below the length corresponding the local maximum resistance of the resistance-length curve. Control of position is effected using resistance of the SMA actuator as a measure of position. The control employs a ‘ratcheting’ method to prevent a failure condition and an initial calibration step to derive a range of target resistance values. In manufacture, the position of a lens holder is adjusted relative to a carrier to provide focussing on the image sensor of an image of an object at a distance in the range from infinity to the hyperfocal distance when the SMA actuator is heated to a predetermined temperature greater than ambient temperature.

대표청구항 ▼

1. A shape memory alloy actuation apparatus comprising: a support structure;a movable element supported on the support structure by a suspension system which guides movement of the movable element;a shape memory alloy actuator connected between the support structure and the movable element such that contraction of the shape memory alloy actuator on heating drives said movement of the movable element relative to the support structure, the shape memory alloy actuator having a property that resistance varies with length along a curve on which the resistance decreases from a local maximum resistance to a local minimum resistance during contraction; andan endstop arranged to limit movement of the movable element to prevent extension of the shape memory alloy actuator in its unheated state beyond a maximum length which is at or below the length corresponding on said curve to a resistance below the resistance of the local maximum resistance by a predetermined amount of the difference between the resistance of the local maximum resistance and the resistance of the local minimum resistance. 2. A shape memory alloy actuation apparatus according to claim 1, wherein said predetermined amount of the difference between the resistance of the local maximum resistance and the resistance of the local minimum resistance is 5% of the difference between the resistance of the local maximum resistance and the resistance of the local minimum resistance. 3. A shape memory alloy actuation apparatus according to claim 1 or 2, wherein the maximum length is at or above the length corresponding on said curve to a resistance below the resistance of the local maximum resistance by an amount of 40% of the difference between the resistance of the local maximum resistance and the resistance of the local minimum resistance. 4. The shape memory alloy actuation apparatus according to claim 1, wherein the movable element is a camera lens element, the suspension system guiding movement of the camera lens element relative to the support structure along the optical axis of the camera lens element. 5. The shape memory alloy actuation apparatus according to claim 4, wherein the camera lens element includes one or more lenses having a diameter of at most 10 mm. 6. The shape memory alloy actuation apparatus according to claim 1, further comprising a biasing arrangement arranged to provide biasing of the movable element relative to the support structure in an opposite direction from the movement driven by contraction of the shape memory alloy actuator. 7. The shape memory alloy actuation apparatus according to claim 1, wherein the suspension system is arranged to provide biasing of the movable clement relative to the support structure in an opposite direction from the movement driven by contraction of the shape memory alloy actuator. 8. The shape memory alloy actuation apparatus according to claim 7, wherein the suspension system comprises a plurality of resilient flexures coupled between the movable element and the support structure, the flexures being flexed to provide said biasing. 9. The shape memory alloy actuation apparatus according to claim 1, wherein the shape memory alloy actuator comprises at least one length of shape memory alloy wire connected in tension between the support structure and the movable element.

이 특허에 인용된 특허 (18) 인용/피인용 타임라인 분석

Mukherjee Ranjan ; Christian Thomas F., Actuation system for the control of multiple shape memory alloy elements.
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Kosaka, Akira; Tanii, Junichi; Wada, Shigeru; Hara, Yoshihiro, Actuator control method and control device.
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Kosaka, Akira, Actuator using shape memory alloy and method for controlling the same.
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Takehana Sakae (Hachioji JPX) Ueda Yasuhiro (Kokubunji JPX) Gotanda Masakazu (Tsukui JPX) Sakurai Tomohisa (Hachioji JPX) Adachi Hideyuki (Hachioji JPX), Apparatus for bending an insertion section of an endoscope using a shape memory alloy.
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McKevitt,Gareth; Hooley,Anthony; Allan,James; Pearce,David Henry; Lenel,Ursula Ruth, Camera lens positioning using a electro-active device.
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Emura Tetsuji (Hachioji JPX), Camera with a shape memory alloy member.
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Yoshihiro Hara JP; Junichi Tanii JP; Shigeru Wada JP; Akira Kosaka JP, Control mechanism with actuator employing shape memory alloy and method for adjusting servo control of the control mechanism.
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Hara, Yoshihiro; Tanii, Junichi, Driving apparatus.
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Yoshiharu Tanaka JP; Junichi Tanii JP; Shoichi Minato JP, Driving mechanism using shape-memory alloy.
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Hooley, Anthony; Pearce, David Henry; Lenel, Ursula Ruth; McKevitt, Gareth; Shepherd, Mark Richard, Electro active devices.
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Kosaka Akira,JPX ; Tanii Junichi,JPX ; Hara Yoshihiro,JPX ; Tanaka Yoshiharu,JPX ; Minato Shoichi,JPX, Image shake correcting optical apparatus.
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Kosaka Akira,JPX ; Tanii Junichi,JPX ; Hara Yoshihiro,JPX ; Tanaka Yoshiharu,JPX ; Minato Shoichi,JPX, Image shake correction device for optical apparatus and optical apparatus having image shake correction device.
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Miyanaga Hirofumi (Tokyo JPX) Sakamoto Nobuyuki (Tokyo JPX) Yoshimitsu Koichi (Tokyo JPX) Tanaka Yasundo (Urawa JPX), Iris diaphragm device and endoscope having the same.
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Ohtsuka,Katsumi; Horiuchi,Tohru, Lens barrel, image-pickup unit having the lens barrel, and manufacturing method of the same.
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Timothy J. Fuss, Lens displacement or other control using shaped memory alloy driver.
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Hooley,Anthony; Pearce,David Henry; McKevitt,Gareth; Shepherd,Mark Richard; Allan,James; Longbottom,Simon Andrew; Lenel,Ursula Ruth, Loudspeaker using an electro-active device.
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Takehana Sakae (Hachioji JPX) Fujio Koji (Hachioji JPX) Ueda Yasuhiro (Kokubunji JPX), Position controlling apparatus.
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MacGregor, Roderick, Shape memory alloy actuators and control methods.
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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
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[미국특허] Shape memory alloy actuation apparatus 원문보기

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[미국특허] Shape memory alloy actuation apparatus 원문보기

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이 특허에 인용된 특허 (18) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (17) 인용/피인용 타임라인 분석

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