WO2005117051A1 - マイクロマシンスイッチ - Google Patents
マイクロマシンスイッチ Download PDFInfo
- Publication number
- WO2005117051A1 WO2005117051A1 PCT/JP2005/010299 JP2005010299W WO2005117051A1 WO 2005117051 A1 WO2005117051 A1 WO 2005117051A1 JP 2005010299 W JP2005010299 W JP 2005010299W WO 2005117051 A1 WO2005117051 A1 WO 2005117051A1
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- WIPO (PCT)
- Prior art keywords
- connection terminal
- fixed
- movable
- support member
- fixed connection
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H59/00—Electrostatic relays; Electro-adhesion relays
- H01H59/0009—Electrostatic relays; Electro-adhesion relays making use of micromechanics
Definitions
- the present invention relates to a micromachine switch, and more particularly, to a micromachine switch adapted to a wide range of signal frequencies from DC level to tens of gigahertz.
- a semiconductor switch is known as an on / off switch that can operate at high speed and frequently.
- Semiconductor switches require operating signals of relatively high power levels, which tend to increase power consumption.
- a propagation signal signal on the controlled side
- RF Radiofrequency
- micro-machine switches have attracted particular attention in recent years as on / off switches that are excellent in performance such as low power consumption, low operating voltage, and space saving, and have relatively good RF characteristics.
- Micromachine switches are known as microswitches manufactured using surface micromachining, park micromachining or semiconductor processing technology. According to the micromachine switch, it is thought that efficient switching can be reliably provided, and the micromachine switch is used for switching the RF front-end chip of a mobile phone.
- a mechanical contact structure having a substrate provided with a signal line or an electrode and a vertically movable contact electrode disposed above the substrate
- Japanese Patent Application Laid-Open No. 9-17300, U.S. Pat.No. 5,578,976 , JP-A-2001-143595, and Patent No. 3119255 Japanese Patent Application Laid-Open No. 9-17300, U.S. Pat.No. 5,578,976 , JP-A-2001-143595, and Patent No. 3119255.
- the signal lines or electrodes on the board constitute fixed connection terminals fixed to the board, and the contact electrodes above the board which can move up and down constitute movable connection terminals which can contact the fixed connection terminals.
- a flexible member having a cantilever structure or a membrane structure is disposed above a substrate, and a base or a leg of the flexible member is fixed to the substrate.
- the flexible member supports the movable connection terminal at a position separated by a predetermined distance from the fixed connection terminal on the substrate, and the movable connection terminal and the fixed connection terminal are arranged in a vertical direction (ie, in a direction perpendicular to the plane of the substrate). It is always kept at a predetermined distance.
- An upper electrode and a lower electrode for driving a switch are provided on the flexible member and the substrate, respectively, and a driving voltage is applied between the upper and lower electrodes during a switching operation.
- the upper and lower electrodes are attracted to each other by electrostatic attraction.
- the flexible member is deformed, and the movable connection terminal comes into contact with the fixed connection terminal.
- the contact electrode movable connection terminal
- contacts the signal line so as to short-circuit the signal line (fixed connection terminal) on the board.
- Such a micromachine switch is desirable as an RF switch because it has better RF characteristics such as insulation performance, insertion loss, linearity, crosstalk, reflection, dynamic range, and operating wavelength band, as compared to conventional semiconductor switches. It has been considered to achieve performance.
- the contact portion is susceptible to fatigue breakage and the fatigue life or switch life is shorter than that of semiconductor switches in recent years. Use tends to be constrained by the particular environment. Therefore, measures are needed to improve the reliability of micromachine switches.
- the conventional micromachine switch employs a mechanical switching method in which a flexible member is vertically displaced by electrostatic attraction and a movable connection terminal is moved up and down. Contact The members are peculiar to the micromachine switch, where Phenomenon) are likely to occur, and malfunction or malfunction of the switch is likely to occur. Such sticking phenomena also impair the reliability of the micromachine switch and constrain the use of the micromachine switch to certain environments, and need to be improved.
- the present invention provides a high-reliability and long-life micromachine switch that prevents fatigue damage and sticking phenomena at the contact portion, thereby adapting to a wide range of signal frequencies from DC level to tens of gigahertz. It is intended to do so.
- Another object of the present invention is to provide a micromachine switch capable of securing the insulation properties of the separated contacts, preventing the sticking phenomenon or contact welding, and reducing the impact force at the time of contacting the contacts.
- the present invention has a fixed connection terminal fixed to a substrate, and a movable connection terminal capable of contacting the fixed connection terminal, wherein the driving force acting on a support member of the movable connection terminal causes the movable connection terminal to rotate.
- a microphone port machine switch configured to displace a support member and to contact or separate the fixed connection terminal and the movable connection terminal,
- the fixed connection terminal and the movable connection terminal are separated from each other in a direction substantially parallel to the plane of the substrate, and the movable connection terminal contacts the fixed terminal by displacement of the support member in this direction.
- a micromachine switch characterized by being arranged. According to the above configuration of the present invention, the fixed connection terminal and the movable connection terminal are not separated in the direction (vertical direction) orthogonal to the plane of the substrate, but in the direction substantially parallel to the plane of the substrate (horizontal or horizontal). The movable connection terminal comes into contact with the fixed connection terminal by the displacement of the support member in this direction.
- Such a switch structure enables the arrangement of a plurality of fixed connection terminals and movable connection terminals dispersed in a plane without significantly changing or enlarging the three-dimensional structure of the micromachine switch. Therefore, in the micromachining switch of the present invention, the shape and number of the fixed repetitive terminals and the movable connection terminals can be appropriately set, and the number of contacts and the contact area can be optimized. Compared with the conventional micromachine switch, the load on the contact portion can be reduced, the fatigue failure of the contact portion can be prevented, and the occurrence of the sticking phenomenon can be prevented.
- the present invention includes a fixed connection terminal fixed to a substrate, and a movable connection terminal capable of contacting the fixed connection terminal, wherein the support member is driven by a driving force acting on the support member of the movable connection terminal. Displacing the fixed connection terminal and the movable connection terminal into or out of contact with each other;
- a plurality of the fixed connection terminals are fixed to the substrate, and a plurality of the movable connection terminals that can be in contact with each of the fixed connection terminals are arranged so as to simultaneously contact the predetermined fixed connection terminals according to the displacement of the support member.
- the present invention provides a micromachine switch characterized in that:
- the contact area between the movable connection terminal and the fixed connection terminal is significantly increased as compared with the one provided with the single movable connection terminal and the fixed connection terminal. Therefore, as compared with a conventional micromachine switch having only one contact portion, the load on each contact portion is reduced, so that fatigue destruction of the contact portion can be prevented and occurrence of a stiction phenomenon can be prevented. .
- the number of movable connection terminals and fixed connection terminals increases, the number of contact portions of the micromachine switch increases. Even if a failure occurs, the micromachine switch can be designed to maintain the desired switching operation and performance, thereby improving the reliability or failsafeness of the micromachine switch. Can be.
- the present invention includes a fixed connection terminal fixed to a substrate and a movable connection terminal capable of contacting the fixed connection terminal, wherein the movable connection terminal is supported by a driving force acting on a support member of the movable connection terminal.
- a micromachine switch configured to displace a member and contact or separate the fixed connection terminal and the movable connection terminal
- the movable connection terminal is positioned between the fixed connection terminals, and is arranged so as to be selectively contacted with the fixed connection terminals on both sides by bidirectional displacement of the support member. provide.
- the support member be forcibly displaced to the side where the movable connection terminal comes into contact with the fixed connection terminal, but also the forcible displacement can be performed in the direction in which the movable connection terminal is separated from the fixed connection terminal. Therefore, the stiction phenomenon of the movable connection terminal and the fixed connection terminal can be positively eliminated. Moreover, since the two surfaces of the movable connection terminal are used as independent contacts, the use frequency of each contact can be reduced by increasing the number of contacts.
- the movable connection terminal has a point-symmetric or line-symmetric shape, or the movable connection terminal and the fixed connection terminal have a point-symmetric or line-symmetric shape as a whole. More preferably, the overall shape including the movable connection terminal, the fixed connection terminal, and the support member is designed to be point-symmetric or line-symmetric. According to such a configuration, the motion balance (movement, restoration, or holding) of the movable connection terminal can be balanced by making the load balance uniform. This will enable optimization of the biasing means (springs, etc.) and improve strength or formability, and will contribute to extending the life of micromachine switches and improving durability.
- the biasing means springs, etc.
- the micromachine switch has an urging means for holding the support member in the initial position, and the support member opposes the holding force of the urging means by the action of the electrostatic force. And return to the initial position by the restoring force of the biasing means when the electrostatic force is released.
- the micromachine switch has a fixed electrode and a movable electrode that generate electrostatic attraction by applying a voltage, wherein the movable electrode is integrally connected to the support member, When an electrostatic attractive force is generated, it approaches the fixed electrode and displaces the support member horizontally or laterally.
- a plurality of fixed electrodes are arranged on the substrate so as to displace the movable electrode in both directions, and a stopper for restricting approach of the movable electrode to the fixed electrode is arranged on the substrate.
- the support member is disposed on the substrate so as to be rotatable or linearly movable in both directions, and the movable connection terminal is attached to a protruding member that protrudes radially outward from an outer peripheral portion of the support member.
- the dynamic connection terminals are arranged so that the surface on each side selectively contacts the fixed connection terminals.
- the present invention further includes a fixed connection terminal fixed to the substrate, and a movable connection terminal capable of contacting the fixed connection terminal, wherein the support member is displaced by driving force acting on the support member of the movable connection terminal.
- a micromachine switch configured to contact or separate a fixed connection terminal and a movable connection terminal
- a micromachine switch comprising a driving means for displacing the movable connection terminal stepwise or simultaneously in two directions to contact the fixed connection terminal.
- the driving means displaces the movable connection terminal in the first direction in which the movable connection terminal approaches the fixed connection terminal, and in the second direction in which the movable connection terminal contacts the fixed connection terminal. Displace the movable connection terminal. Therefore, the micromachine switch can secure the insulation of the contacts in the contact open state and reduce the impact force at the time of contact with the contacts.
- the driving means initially displaces the movable connection terminal in the first direction when the contact is separated, and then applies a shearing force to a contact portion between the movable connection terminal and the fixed connection terminal.
- the sticking phenomenon or contact welding can be effectively prevented.
- the first direction is set to a horizontal direction
- the second direction is set to a vertical direction or a rotation direction around a horizontal axis
- the driving means is configured to apply a voltage It has a movable electrode for generating electrostatic attraction and a fixed electrode having a two-layer structure.
- the fixed electrode is disposed below the first fixed electrode and a first fixed electrode horizontally separated from the movable electrode. And a second fixed electrode.
- the driving means can be incorporated into the micromachine switch without greatly enlarging the three-dimensional structure of the micromachine switch.
- FIG. 1 is a plan view showing a structure of a micromachine switch according to a preferred embodiment of the present invention.
- FIG. 2 is a side view of the micromachine switch shown in FIG.
- FIG. 3 is a longitudinal sectional view showing the structure of the micromachine switch shown in FIGS. 1 and 2.
- FIG. 4 is a cross-sectional view showing an operation mode of the micromachine switch, and shows a first switching position of the micromachine switch.
- FIG. 5 is a cross-sectional view showing an operation mode of the micromachine switch, and shows a second switching position of the micromachine switch.
- FIG. 6 is a plan view showing a modification of the micromachine switch.
- FIG. 7 is a plan view showing a structure of a micromachine switch according to another embodiment of the present invention.
- FIG. 8 is a cross-sectional view showing an operation mode of the micromachine switch shown in FIG. FIG. 3 shows a first switching position of the micromachine switch.
- FIG. 9 is a cross-sectional view showing an operation mode of the micromachine switch shown in FIG. 7, showing a second switching position of the micromachine switch.
- FIG. 10 is a plan view showing the structure of a micromachine switch according to still another embodiment of the present invention.
- FIG. 11 is a perspective view of the micromachine switch shown in FIG.
- FIG. 12 is a cross-sectional view taken along the line II shown in FIG.
- FIG. 13 is a cross-sectional view taken along line ⁇ - ⁇ shown in FIG.
- FIG. 14 is a perspective view schematically showing a relative positional relationship and operation principle of the first drive unit and the second drive unit.
- FIG. 15 is a cross-sectional view taken along line ⁇ - ⁇ shown in FIG.
- FIG. 16 is a perspective view showing a mode of movement of the movable connection terminal.
- FIG. 17 is a perspective view showing an operation mode of the micromachine switch. BEST MODE FOR CARRYING OUT THE INVENTION
- FIGS. 1 and 2 are a plan view and a side view, respectively, showing the structure of a micromachine switch according to a preferred embodiment of the present invention.
- FIG. 3 is a longitudinal section showing the structure of the micromachine switch shown in FIGS. FIG.
- the micromachine switch 1 has a stationary pin 2, a movable support member 3, a movable connection part 4, a fixed connection part 5, an urging means 6, and a drive part 7.
- the movable connection part 4 is displaced in both directions according to the bidirectional rotation of the support member 3 about the stationary pin 2.
- the fixed connection section 5 includes a plurality of fixed connection terminals 50 fixed to the substrate 9.
- the movable connection portion 4 includes a plurality of movable connection terminals 40, and each of the movable connection terminals 40 comes into contact with the fixed connection terminal 50 in accordance with a change in the angle of the support member 3 about the stationary pin 2, or Separate.
- the stationary pin 2 is arranged on the shaft 21 fixed to the substrate 9 and on the top of the shaft 21. And an enlarged head portion 22 disposed thereon.
- the shaft portion 21 vertically penetrates the center hole 31 of the support member 3 and rotatably supports the support member 3.
- the support member 3 has a circular planar contour with the axis of the shaft portion 21 as the center of rotation.
- the plurality of arms 41 are fixed to the outer peripheral surface 32 of the support member 3 and extend radially outward from the outer peripheral surface 32.
- Each movable connection terminal 40 is fixed to the outer end of each arm section 41.
- the movable connection terminal 40 has a shape and size in which the tip of each arm portion 41 is enlarged.
- Each of the movable connection terminals 40 extends into the corresponding recess 51 of the fixed connection terminal 50.
- the left and right side surfaces 42 of the movable connection terminal 40 are positioned so as to be able to contact the side surfaces 52 of each fixed connection terminal 50 located in the recess 51.
- FIG. 1 shows an initial state in which the side surfaces 42 and 52 are separated.
- Each biasing means 6 includes an elastic member 60 for elastically holding the support member 3 at an initial position (the position shown in FIG. 1) and a mooring portion 61 for mooring the elastic member 60 to the substrate 9. It is.
- the elastic member 60 is a leaf spring having one end locked to the mooring portion 61 and the other end locked to the outer peripheral surface 32 of the support member 3.
- the elastic member 60 is disposed at a point-symmetric position and shape with respect to the center of the support member 3, and the support member 3 is held at the initial position shown in FIG. 1 by an elastically deformable elastic member 60. Is done.
- a pair of drive units 7 are arranged point-symmetrically before and after the support member 3.
- the driving section 7 is composed of a comb-shaped movable electrode 70, a comb-shaped fixed electrode 71, and a stopper 72, respectively.
- the linear base 74 of the movable electrode 70 is fixed to the outer peripheral surface 32 of the support member 3.
- the linear base 74 extends linearly outward in the radial direction of the support member 3.
- a number of extensions 75 are equally spaced along the base 74 and project symmetrically on either side of the base 74. Each extension 75 has an arc profile concentric with the support member 3.
- the enlarged outer end 76 of the base 74 is positioned between the left and right stoppers 72.
- Each of the stoppers 72 is fixed to the substrate 9 and comes out when the support member 3 rotates. It abuts against the ends 76 and regulates the rotation of the support member 3.
- the fixed electrode 71 has a linear base 77 fixed to the substrate 9, and the linear base 77 is symmetrically arranged on both sides of the movable electrode 70.
- a number of extensions 78 are arranged at equal intervals on one side of the base 77 and project from the base 77 toward the movable electrode 70.
- Each extension 78 has a circular arc profile concentric with the support member 3.
- the extensions 75 and 78 are arranged alternately in the radial direction of the support member 3, and thus, a non-contact comb electrode pair is formed before and after the support member 3 in parallel with the plane of the substrate 9. .
- the center lines C 1 and C 2 in the XY direction of the micromachine switch 1 intersect at the rotation center of the support member 3.
- the fixed connection parts 5 are respectively arranged in four regions of the micromachine switch 1 separated by the center lines C l and C 2.
- Each of the fixed connection portions 5 includes a fixed connection pad 55 fixed to the substrate 9.
- the fixed connection terminal 50 extends radially inward from the fixed connection pad 55 to form a recess 51 into which the movable connection terminal 40 extends.
- the side surface 52 of the fixed connection terminal 50 located in the recess 51 contacts the side surface 42 of the movable connection terminal 40 when the support member 3 rotates.
- the substrate 9 is made of, for example, a 500-m-thick silicon substrate whose surface is covered with a 0.5-nm-thick silicon nitride (Si 3 N 4 ) electrical insulating film (not shown). Electrical insulating film of silicon oxide (Si0 2), alumina (A1 2 0 3) other may be formed by ceramics materials or the like.
- the fixed connection portion 5 and the comb-shaped fixed electrode 71 are made of polycrystalline silicon doped with phosphorus (P), and are similar to semiconductor manufacturing processes such as a film forming process by a CVD method or a photolithography (exposure and development) process. Through the steps described above, it is formed on the substrate 9.
- the material of the fixed connection portion 5 and the comb-shaped fixed electrode 71 a conductive material other than silicon, for example, copper, aluminum, gold, or the like may be used. Alternatively, the surface of the comb-shaped fixed electrode 71 may be coated.
- the plane dimensions (external dimensions) of the micromachine switch 1 are set to, for example, 1 mm, and the height (thickness) of the micromachine switch 1 is set to, for example, 10 to 25. Determined.
- the support member 3, the movable connection part 4, and the comb-shaped movable electrode 70 are formed of substantially the same material and the same manufacturing method as the fixed connection part 5 and the comb-shaped fixed electrode 71.
- the support member 3 is rotatably supported by the stationary pin 2, and the movable connection portion 4 and the comb-shaped movable electrode 70 are supported by the support member 3, and both are suspended on the substrate 9 in a non-contact state with the substrate 9.
- the stationary pin 2 and the urging means 6 are formed from single crystal or polycrystalline silicon.
- a circuit section 90 having a predetermined electric wiring pattern is formed on the substrate 9.
- the circuit section 90 is electrically connected to the fixed connection section 5 via the electric connection pins 91 and the conductive means 92.
- the circuit section 90 is also operatively connected to the movable connection section 4 via similar electrical connection pins and conductive means.
- other current supply means or power supply means such as through-hole connection may be employed.
- FIG. 4 and FIG. 5 are cross-sectional views showing the operation mode of the micromachine switch 1.
- FIG. FIG. 4 shows a first switching position of the micromachine switch 1
- FIG. 5 shows a second switching position of the micromachine switch 1.
- each part of the comb-shaped movable electrode 70 is a pair of left and right fixed electrodes 7 constituting the comb-shaped fixed electrode 71. It is arranged at a predetermined distance from 1a, 71b, for example, at a distance of 2 m.
- power is supplied from an external power supply to the micromachine switch 1 via the circuit section 90 and a voltage is applied between the movable electrode ⁇ 0 and the fixed electrode 71a, static electricity is generated between the movable electrode 70 and the fixed electrode 71a. An electromotive force is generated, and the movable electrode 70 is attracted to the fixed electrode 71a. As shown in FIG.
- the support member 3 rotates around the stationary pin 2 by electrostatic attraction acting on the movable electrode 70, and the movable electrode 70 comes close to the fixed electrode 71a.
- the angle changes.
- the enlarged outer end portion 76 of the movable electrode 70 is brought into contact with the stopper 72 a before the movable electrode 70 and the fixed electrode 71 a come into contact with each other, and becomes static.
- the movable connection terminal 40 formed integrally with the support member 3 rotates together with the support member 3, and the side surface 4 2 a of the movable connection terminal 40 becomes a fixed connection terminal 5 when the rotation of the support member 3 is stopped.
- the side surface 42a and the side surface 52a are formed on the movable connection terminal 40 and the fixed connection terminal 50 so as to face each other in a substantially parallel state at the initial position (FIG. 1). Makes surface contact when the rotation stops.
- the side surface 4 2b and the side surface 5 2b are also formed into a movable connection terminal 40 and a fixed connection terminal 50 so as to face each other in a substantially parallel state at the initial position (FIG. 1).
- 50 rotation stops surface contact.
- the short circuit between the movable electrode 70 and the fixed electrode 71b is reliably prevented by the stopper 72b as described above.
- the plurality of terminals 40 and 50 can be dispersedly arranged in a plane without greatly enlarging or increasing the three-dimensional structure of the micromachine switch 1. .
- the side surfaces 42a and 42b of the movable connection terminal 40 are fixed by alternately or selectively switching the micromachine switch 1 to the first switching position or the second switching position under the control of the circuit section 90.
- the contacts of the micromachine switch 1 can be connected by alternately or selectively contacting the side surfaces 52a, 52b of the connection terminal 50. Therefore, the number or frequency of contact between the same side surface 42 of the movable connection terminal 40 and the same side surface 52 of the fixed connection terminal 50 should be greatly reduced. Can do. For example, if a simple alternating control is executed,
- the contact components 3, 4, and 5 can be prevented from fatigue fracture and the life of the micromachine switch 1 can be extended.
- the side surfaces 42a, 42b on both sides of the movable connection terminal 40 are selectively brought into contact with the side surfaces 52a, 52b on both sides of the fixed connection terminal 50.
- the micromachine switch 1 provided with 0, the number of contacts is doubled and the contact area is greatly increased. Therefore, even if any of the terminals 40, 50 is abnormal or defective, the other terminals 4 The micromachine switch 1 maintains the desired switching behavior and performance because 0, 50 functions normally. Therefore, the reliability of the micromachine switch 1 is improved.
- the electrostatic attraction is reduced to the fixed connection terminal 50. Acts so as to separate the side surface 42 of the movable connection terminal 40 in contact with the side surface 52 from the side surface 52. Therefore, the occurrence of the sticking phenomenon at the terminals 40 and 50 can be positively prevented.
- FIG. 6 is a plan view showing a modified example of the micromachine switch 1.
- FIG. The micromachine switch 1 shown in FIG. 6 has a hollow cylindrical support member 3, and the vertical shaft 21 of the stationary pin 2 is disposed at the center of the support member 3.
- the biasing means 6 is composed of a plurality of leaf springs that can be elastically deformed. Each leaf spring extends radially from the shaft portion 21 and integrally connects the shaft portion 21 and the support member 3.
- the stationary pin 2 and the urging means 6 are formed from single crystal or polycrystalline silicon.
- the micromachine switch is controlled under the control of the circuit section 90 (Fig. 3).
- the side surface 42 of the movable connection terminal 40 crosses the side surface 52 of the fixed connection terminal 50. Contact each other or selectively.
- FIG. 7 is a plan view and a side view showing a structure of a micromachine switch according to another embodiment of the present invention.
- FIGS. 8 and 9 are cross-sectional views showing an operation mode of the micromachine switch 1.
- FIG. 8 shows the first switching position of the micro machine switch 1
- FIG. 9 shows the second switching position of the micro machine switch 1.
- components that are substantially the same as or equivalent to the components of the embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals.
- the micromachine switch 1 of the above-described embodiment has a switching structure using the rotational movement of the support member 3
- the micromachine switch 1 of the present embodiment has a linear or horizontal linear shape of the support member 3. It has a switching structure using motion.
- the micromachine switch 1 includes a movable support member 3, a movable connection part 4, a fixed connection part 5, an urging means 6, and a driving part 7.
- the movable connection portion 4 has a plurality of movable connection terminals 40 that are displaced in accordance with the movement of the support member 3 in the front-rear direction
- the fixed connection portion 5 has a plurality of fixed connection terminals fixed to a substrate (not shown). Has 50.
- the movable connection terminal 40 comes into contact with or separates from the fixed connection terminal 50 due to the reciprocating motion of the support member 3.
- the support member 3 is formed of a plate or a shaft member extending along the center line C2, and the comb-shaped movable electrodes 70 of the drive unit 7 are connected to both ends of the support member 3, respectively.
- Each drive unit 7 is composed of a comb-shaped movable electrode 70, a comb-shaped fixed electrode 71, and a stopper 72, and each of the components 70, 71, and 72 is arranged with respect to the center lines C1, C2. They are arranged symmetrically.
- a linear base 74 of the movable electrode 70 is integrally connected to an end of the support member 3 and extends in a direction orthogonal to the support member 3.
- a number of extensions 75 are arranged at equal intervals on the outer surface of the base 74 and project in the direction of the center line C2.
- the stoppers 72 are arranged adjacent to both ends of the base 7, and the urging means 6 are connected to both ends of the base 74.
- the urging means 6 includes an elastic member 60 for elastically holding the support member 3 and a mooring the elastic member 60 to the substrate. Mooring section 61.
- the elastic member 60 is composed of a leaf spring having one end locked to the mooring portion 61 and the other end locked to the end surface of the linear base 74, and the support member 3 is elastically deformable elastically. The member 60 is held at the initial position shown in FIG.
- the linear base 77 of the fixed electrode 71 fixed to the substrate is arranged at a position facing the movable electrode 71, and a number of extensions 78 are arranged at equal intervals on the inner surface of the base 77.
- the extension part 78 protrudes from the base part 77 toward the movable electrode 70 and extends between the extension parts 75, so that a non-contact comb electrode pair is formed before and after the support member 3.
- a plurality of arm portions 41 constituting the movable connection portion 4 are fixed to the side surface 32 of the support member 3 and extend outward from the side surface 32 in parallel with the center line C1.
- a movable connection terminal 40 having a rectangular cross section is fixed to the outer end of each arm portion 41, and each movable connection terminal 40 extends into the corresponding recess 51 of the fixed connection terminal 50.
- the side surface 52 of the fixed connection terminal 50 faces the side surface 42 of the movable connection terminal 40 in the recess 51 and is positioned so as to be able to contact the side surface 42. In the initial position shown in FIG. 7, the side surfaces 42 and 52 are apart from each other.
- the support member 3 is normally held at the initial position (FIG. 7) by the elastic member 60, and each part of the comb-shaped movable electrode 70 is formed of the comb-shaped movable electrode 70 constituting the comb-shaped fixed electrode 71. It is arranged at a predetermined distance from each part, for example, at a distance of 2 m.
- the support member 3 is moved in the direction of the center line C 2.
- the movable connection terminal 40 and the fixed connection terminal 50 come into contact with each other.
- the plurality of terminals 40 and 50 are dispersed and arranged in a plane without greatly enlarging the three-dimensional structure of the micromachine switch 1. can do.
- the micromachine switch 1 is controlled to be switched under the control of the circuit section 90, and a first switching position for applying a voltage between the movable electrode 70a and the fixed electrode 71a, and the movable electrode 70b and By alternately or selectively switching the micromachine switch 1 to either the second switching position for applying a voltage between the fixed electrodes 71b, the side surfaces 42a, 42 of each side of the movable connection terminal 40 b can be alternately or selectively contacted with the side surfaces 52a, 52b of the fixed connection terminal 50, and the contact of the micromachine switch 1 can be connected.
- the frequency at which the same side surface 42 of the movable connection terminal 40 contacts the same side surface 52 of the fixed connection terminal 50 is greatly reduced, and as a result, the fatigue of the contact members 3, 4, and 5 is reduced. Can be prevented, and the life of the micromachine switch 1 can be extended.
- the micromachine switch 1 is moved from the first switching position to the initial position or the second position.
- the support member 3 is in contact with the side surface 4 2 a, 52 a or the side surface 42 b, 52 b. To force separation. Therefore, the stiction phenomenon at the terminals 40 and 50 can be reliably prevented.
- FIGS. 10 and 11 are a plan view and a perspective view showing a structure of a micromachine switch according to still another embodiment of the present invention.
- FIGS. 12 and 13 are I-I lines of the micromachine switch.
- FIG. 3 is a cross-sectional view and a cross-sectional view taken along line H- ⁇ .
- components that are substantially the same as or equivalent to the components of the embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals.
- the micromachine switch 1 shown in FIGS. 10 to 14 has a support member 3, a movable connection part 4, a fixed connection part 5, a biasing means 6, and a driving part 7, as in the above-described embodiment. 4 is configured to be displaced in a predetermined direction in a plane.
- the micromachine switch 1 further has a second drive unit 8 (FIG. 13) disposed below the drive unit 7, and the second drive unit 8 moves the movable connection unit 4 up and down (vertically). It is configured to be displaced.
- the fixed connection section 5 includes a base 55 fixed to a substrate (not shown), and a pair of fixed connection terminals 50 formed on the upper surface of the base 55.
- the fixed connection terminal 50 has fixed contacts 50a separated by a predetermined distance.
- the movable connection part 4 has a pair of movable connection terminals 40 fixed to the side surface of the support member 3, and the movable connection terminal 40 is arranged at a position facing the contact 50a.
- Linear bases 74 constituting the first drive unit 7 are integrally connected to both ends of the support member 3.
- the base 74 and the support member 3 constitute an integral shaft member connected in series on the center line C2.
- the first drive unit 7 includes a comb-shaped movable electrode 70 and a comb-shaped fixed electrode 71.
- the comb-shaped movable electrode 70 has a base 74 and a base.
- the comb-shaped fixed electrode 71 has a linear base 77 and an extension 78 arranged on one side of the base 77.
- the biasing means 6 is composed of an elastic member 60 connected to the end of the base 74 and an anchoring portion 61 for anchoring the elastic member 60 to the substrate.
- the elastic member 60 is a leaf spring having one end locked to the mooring portion 61 and the other end locked to the end face of the linear base 74.
- the support member 3 is held in the initial position shown in FIGS. 10 and 1 ′ 1 by the elastic member 60, and the movable connection terminal 40 and the contact 50a are separated from each other in the horizontal direction and the vertical direction. Held in position.
- the second driving section 8 has four comb-shaped movable electrodes 81.
- the fixed electrode 81 has the same structure and shape as the fixed electrode 71, and is arranged at the same plane position.
- Each fixed electrode 81 includes a linear base 87 and an extension 88, and the base 87 is fixed to a substrate (not shown).
- An insulating layer 89 is interposed between the bases 77,87.
- FIG. 14 is a perspective view schematically showing a relative positional relationship between the first driving unit 7 and the second driving unit 8 and an operation principle.
- the operation when the switch is ON-OFF is set as follows.
- a voltage is applied between the fixed electrode 71 located on the side of the fixed connection terminal 5 (the fixed electrode 71 shown on the left side in FIG. 10) and the movable electrode 70, and the movable connection terminal 40 is displaced in the horizontal direction. Let it. Next, a voltage is applied between the fixed electrode 81 and the movable electrode 70 to displace the movable connection terminal 40 downward.
- a voltage is applied between the fixed electrode 7 1 (the fixed electrode 7 1 shown on the right side in FIG. 10) located on the side opposite to the fixed connection terminal 5 and the movable electrode 70, and the movable connection terminal 40 is connected. Displace horizontally. The voltage between the fixed electrode 81 and the movable electrode 70 is extinguished, and the movable connection terminal 40 is displaced upward by the repulsive force of the elastic member 60 to return to the initial position.
- FIG. 15 is a cross-sectional view taken along the line ⁇ ⁇ ⁇ ⁇ of the micromachine switch 1.
- FIGS. 15 (A) to 15 (C) show the displacement of the movable electrode 70 shown in FIGS. 14 (A) to 14 (C). The displacement of the movable connection terminal 40 corresponding to FIG.
- the movable contact 40a of the movable connection terminal 40 and the fixed contact 50a are separated by a distance L and H in the horizontal and vertical directions at the initial position shown in FIG. 15 (A). In this state, the contacts 40a and 50a do not face each other, and therefore, sufficient insulation can be ensured even though the distance H at the time of facing is set to a relatively small dimension. .
- the movable connection terminal 40 moves horizontally by the horizontal distance L.
- the movable contact 40a located on the lower surface of the tip of the movable connection terminal 40 Moves above the fixed contact 50a and faces the fixed contact 50a as shown in FIG. 15 (B). In this state, the contacts 40a and 50a are separated by a distance H in the vertical direction.
- FIG. 16 is a perspective view showing a mode of movement of the movable connection terminal 40.
- the movable connection terminal 40 In the initial position shown in Fig. 16 (A), the movable connection terminal 40 is separated from the fixed contact 50a, and the fixed connection terminal 50 cuts the conductive path by separating the fixed contact 50a. Have been.
- the movable connection terminal 40 moves horizontally just above the fixed contact 50a as shown in FIG. 16 (B), and then displaces downward as shown in FIG. 16 (C).
- 40 a contacts fixed contact 50 a.
- the conductive path is closed as shown by the imaginary line in FIG. 16 (C).
- the movable connection terminal 40 moves horizontally as shown by the dashed arrow in Fig. 16 (B), and then moves as shown by the dashed arrow in Fig. 16 (C). Displace upward. Due to the horizontal movement of the movable connection terminal 40, a shear force acts on the interface between the contacts 40a and 50a. This facilitates the separation of the contacts 40a, 50a by the subsequent upward displacement of the movable connection terminal 40.
- FIG. 17 is a perspective view of the micromachine switch 1.
- FIGS. 17 (A) to 17 (C) show the displacement of the movable electrode 70 shown in FIGS. 14 (A), (B) and (D). The corresponding displacement of the movable connection terminal 40 is shown.
- the movable connection terminal 40 In the initial position shown in Fig. 17 (A), the movable connection terminal 40 is separated from the fixed contact 50a, and the fixed connection terminal 50 cuts the conductive path by separating the fixed contact 50a. Have been. Between movable electrode 70 and fixed electrode 71 When a voltage is applied, the movable connection terminal 40 moves horizontally just above the fixed contact 50a as shown in FIG. 17 (B). When a voltage is applied only between the two fixed electrodes 81 and the movable electrode 70 located on the side of the fixed connection terminal 50, the movable electrode 70 becomes a center line as shown in Fig. 17 (C). It rotates about C2, and as a result, the movable contact 40a contacts the fixed contact 50a. Thus, the fixed connection terminal 50 is closed, and a conductive path indicated by a virtual line in FIG. 16 (C) is formed.
- the fixed electrode 71 having a two-layer structure or a three-dimensional structure in which the movable electrode 70 is displaced stepwise in two directions, that is, the horizontal direction and the vertical direction (or the rotation direction), 8 Equipped with 1. Therefore, the insulation property at the time of contact opening (at the time of switch OFF) can be ensured without increasing the distance between the fixed contact 50a and the movable contact 40a.
- the number, arrangement, and shape of the support members, the movable connection terminals, and the fixed connection terminals can be arbitrarily changed according to the present invention.
- the structure and arrangement of the drive unit for driving the support member can also be arbitrarily changed according to the present invention.
- the movable electrode 70 can be simultaneously displaced in two directions (horizontal direction and vertical direction).
- the movable contact 40a is displaced diagonally downward or diagonally upward.
- the contacts 40a and 50a In order to facilitate separation of a, it is desirable to displace the movable electrode 70 stepwise in two directions when the contacts are separated.
- the micromachine switch of the present invention is used as a micromachine switch adapted to a wide range of signal frequencies from DC level to several tens gigahertz.
- the present invention relates to a micromachine switch required to have high reliability, low power consumption, low operating voltage, space saving, efficient switching, etc., for example, a gain control of an RF front-end chip of a mobile phone. It can be preferably applied to a micromachine switch that can be used for switching between transmission / reception modes or between bands.
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- Micromachines (AREA)
Abstract
Description
Claims
Priority Applications (1)
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JP2006514027A JPWO2005117051A1 (ja) | 2004-05-31 | 2005-05-31 | マイクロマシンスイッチ |
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JP2004161811 | 2004-05-31 | ||
JP2004-161811 | 2004-05-31 |
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Cited By (10)
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EP1850360A1 (en) * | 2006-04-26 | 2007-10-31 | Seiko Epson Corporation | Microswitch with a first actuated portion and a second contact portion |
WO2007125969A1 (ja) * | 2006-04-28 | 2007-11-08 | Panasonic Corporation | マイクロマシンスイッチ、フィルタ回路、共用器回路、及び通信機器 |
JP2010199214A (ja) * | 2009-02-24 | 2010-09-09 | Oki Semiconductor Co Ltd | Memsチューナブルキャパシタ |
JP2011146403A (ja) * | 2006-09-12 | 2011-07-28 | Alcatel-Lucent Usa Inc | 湾曲バイレイヤーによるメカニカルスイッチ |
CN102142337A (zh) * | 2010-02-01 | 2011-08-03 | 索尼公司 | 接触开关 |
JP2013232391A (ja) * | 2011-07-29 | 2013-11-14 | General Electric Co <Ge> | 電気分配システム |
WO2016047011A1 (ja) * | 2014-09-26 | 2016-03-31 | ソニー株式会社 | スイッチ装置および電子機器 |
WO2017153773A1 (en) * | 2016-03-11 | 2017-09-14 | The University Of Bristol | Electromechanical relay device |
WO2017189806A1 (en) * | 2016-04-27 | 2017-11-02 | The Regents Of The University Of California | Rf-powered micromechanical clock generator |
US10257002B2 (en) | 2016-04-27 | 2019-04-09 | The Regents Of The University Of California | Zero-quiescent power receiver |
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US7745747B2 (en) | 2006-04-26 | 2010-06-29 | Seiko Epson Corporation | Microswitch with a first actuated portion and a second contact portion |
EP1850360A1 (en) * | 2006-04-26 | 2007-10-31 | Seiko Epson Corporation | Microswitch with a first actuated portion and a second contact portion |
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JP2010199214A (ja) * | 2009-02-24 | 2010-09-09 | Oki Semiconductor Co Ltd | Memsチューナブルキャパシタ |
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CN107077999B (zh) * | 2014-09-26 | 2019-05-31 | 索尼公司 | 开关装置和电子设备 |
WO2017153773A1 (en) * | 2016-03-11 | 2017-09-14 | The University Of Bristol | Electromechanical relay device |
US10727016B2 (en) | 2016-03-11 | 2020-07-28 | The University Of Bristol | Electromechanical relay device |
WO2017189806A1 (en) * | 2016-04-27 | 2017-11-02 | The Regents Of The University Of California | Rf-powered micromechanical clock generator |
US10257002B2 (en) | 2016-04-27 | 2019-04-09 | The Regents Of The University Of California | Zero-quiescent power receiver |
US10867757B2 (en) | 2016-04-27 | 2020-12-15 | The Regents Of The University Of California | RF-powered micromechanical clock generator |
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