Patent Description:
A thermoelectric MEMS (Micro-Electro-Mechanical System, micro-electro-mechanical system) driving technology is a technology of generating driving force through thermal deformation of a material. Compared with another MEMS driving technology, the thermoelectric MEMS driving technology has advantages of strong driving force, a large displacement, and the like, and has a very broad application prospect. Especially in the optical communications field, a thermoelectric MEMS micromirror is manufactured in an array form by using the thermoelectric driving technology, two MEMS micromirror array chips are used to form an optical path, and when an MEMS micromirror on a driving array deflects to a proper position, an OXC (Optical Cross-Connect, optical cross-connect) function of switching communication light from an input port to any output port may be implemented. Because the thermoelectric MEMS micromirror has an advantage of a large deflection angle, assembling of an OXC module having a large port may be supported. In this way, a switching capacity of the OXC module is greatly expanded, to meet a communication data transmission requirement that grows at a high speed.

How to design a micromirror structure that can ensure a more precise position of a micromirror in a deflection process is a direction of continuous research in the industry.

<CIT> describes an optical switch and a wavelength division multiplexing optical system. The optical switch includes an input port array, an input collimator array, an input micromirror array, an output micromirror array, an output collimator array, and an output port array. All input micromirrors included in the input micromirror array can be deflected in two mutually perpendicular directions.

<CIT> discloses a micromirror device having a thermoelectric actuator.

Embodiments of this application provide a micromirror structure, to ensure that a more precise position of a lens is obtained when the lens deflects. The embodiments of this application further provide a micromirror array chip including the micromirror structure.

According to a first aspect, an embodiment of this application provides a micromirror structure, including an outer frame, an inner frame, a lens, a pair of first hinges, a pair of second hinges, a first driver module, and a second driver module. The lens is an MEMS micromirror. The pair of first hinges is respectively located at two opposite ends of the lens, the pair of first hinges is connected between the lens and an inner wall of the inner frame, and a connection line of the pair of first hinges forms a first rotation axis. The pair of second hinges is respectively located at two opposite ends of the inner frame, the pair of second hinges is connected between an outer wall of the inner frame and an inner wall of the outer frame, a connection line of the pair of second hinges forms a second rotation axis, and the first rotation axis is perpendicular to the second rotation axis. The first driver module is connected to the inner frame, to drive the inner frame, together with the lens, to rotate by using the second rotation axis as a center. The second driver module is connected to the lens, to drive the lens to rotate by using the first rotation axis as a center. In this embodiment of this application, the inner frame is disposed between the lens and the outer frame, the pair of first hinges is connected between the inner frame and the lens to form the first rotation axis, the pair of second hinges is connected between the inner frame and the outer frame to from the second rotation axis, and the first rotation axis is perpendicular to the second rotation axis, so that the lens cannot displace in a direction perpendicular to the lens because the lens is constrained by the pair of first hinges when the lens rotates around the first rotation axis, and the lens cannot displace in a direction perpendicular to the lens because the lens is constrained by the pair of second hinges when the lens rotates around the second rotation axis. This can ensure a more precise position of the lens in a deflection process. In addition, a structure used by the lens to rotate around the first rotation axis and a structure used by the lens to rotate around the second rotation axis are independent of each other. Therefore, there is no mechanical crosstalk between deflection around the first rotation axis and deflection around the second rotation axis.

In an implementation, the pair of first hinges implements a rigid connection between the lens and the inner frame in a direction of the first rotation axis, so that no displacement occurs between the inner frame and the lens when the first driver module drives the inner frame, together with the lens, to rotate by using the second rotation axis as a center, thereby ensuring a precise position of the lens. In addition, the pair of first hinges implements the rigid connection between the lens and the inner frame in the direction of the first rotation axis, so that fixedness of a position of the first rotation axis can be determined. If the first hinges are flexibly connected between the lens and the inner frame in the direction of the first rotation axis, when the second driver module drives the lens to rotate by using the first rotation axis as a center, the position of the first rotation axis very easily changes due to elastic deformation of the first hinges (the position change may be referred to as an unwanted offset, and a direction and a displacement of the position change are uncertain). Consequently, the lens is imprecisely positioned.

In an implementation, the pair of second hinges implements a rigid connection between the inner frame and the outer frame in a direction of the second rotation axis, in order that fixedness of a position of the second rotation axis can be determined, so that the lens is precisely positioned when the lens rotates around the second rotation axis.

In a process in which the lens rotates by using the first rotation axis as a center, a deflection position of the lens is maintained through elastic deformation of the pair of first hinges. In other words, in a rotation direction of the first hinges, the first hinges are flexibly connected between the inner frame and the lens.

In a process in which the inner frame, together with the lens, rotates by using the second rotation axis as a center, a deflection position of the inner frame together with the lens is maintained through elastic deformation of the pair of second hinges. In other words, in a rotation direction of the second hinges, the second hinges are flexibly connected between the inner frame and the outer frame.

The first driver module includes a first thermoelectric driving arm, the first thermoelectric driving arm is connected between the outer frame and the inner frame, an end that is of the first thermoelectric driving arm and that is connected to the inner frame is a first connection end, and a center of the first connection end is located on the first rotation axis. When the first thermoelectric driving arm is heated, the first thermoelectric driving arm deforms, so that the first connection end displaces in a direction perpendicular to the lens, wherein the first connection end of the first thermoelectric driving arm is moved to drive the inner frame, together with the lens, to rotate by using the second rotation axis as a center. In this embodiment, the first driver module is designed as a thermoelectric driving arm. When the first thermoelectric driving arm is heated, the first thermoelectric driving arm deforms, so that the first connection end displaces in the direction perpendicular to the lens. The first rotation axis is set to a direction X, the second rotation axis is set to a direction Y, and the direction perpendicular to the lens is a direction Z. In this implementation, the first connection end of the first thermoelectric driving arm is moved in the direction Z, to drive the inner frame, together with the lens, to rotate by using the second rotation axis as a center.

In an implementation, there is one first connection end, and the first connection end is located on the first rotation axis. Specifically, the first thermoelectric driving arm includes a first electrode end, a first elastic arm, and the first connection end, the first electrode end and the first connection end are respectively located on two sides of the first elastic arm, the first electrode end is configured to be electrically connected to a first electrode, to apply a voltage or a current to the first thermoelectric driving arm. Under the action of a voltage difference and a current, the first elastic arm thermally deforms, to drive the first connection end to move in the direction Z. In this implementation, the first elastic arm is in a packaged ring-shaped structure.

In an implementation, there are at least two first connection ends, and the at least two first connection ends are symmetrically distributed by using the first rotation axis as a center, so that a center of the first connection ends is located on the first rotation axis. This is beneficial for the first thermoelectric driving arm to apply uniform force to the inner frame. Specifically, in this implementation, the first thermoelectric driving arm includes a first electrode end, two first elastic arms, and two first connection ends, ends of the two first elastic arms are respectively connected to the two first connection ends, and the other ends of the two first elastic arms are both connected to the first electrode end.

In an implementation, the first driver module further includes the first electrode, the first electrode is disposed on the outer frame, and the first electrode is electrically connected to the first thermoelectric driving arm. Specifically, the first electrode is electrically connected to the first electrode end, the outer frame may be designed as a circuit board, and the first electrode is electrically connected to the first electrode end by using cables on the circuit board.

Specifically, a center of the first electrode end is located on an extension line of the first rotation axis.

The second driver module includes a second thermoelectric driving arm, the second thermoelectric driving arm is connected between the inner frame and the lens, an end that is of the second thermoelectric driving arm and that is connected to the inner frame is a second electrode end, and a center of the second electrode end is located on an extension line of the second rotation axis. An architecture of the second driver module may be the same as that of the first driver module, but only disposing positions are different. The second driver module is disposed between the inner frame and the lens. Specifically, the second thermoelectric driving arm includes the second electrode end, a second connection end, and a second elastic arm connected between the second electrode end and the second connection end, and the second electrode end is connected to the inner frame.

In an implementation, the second driver module further includes a second electrode, the second electrode is disposed on the outer frame, and the second electrode is electrically connected to the second thermoelectric driving arm. Specifically, the second electrode is electrically connected to the second electrode end.

In an implementation, the second electrode end and one of the second hinges are respectively disposed on two sides of the inner frame oppositely, that is, the second electrode end is located on an extension line of the second hinge. In other words, the second hinge is located on the second rotation axis. The second electrode is electrically connected to the second thermoelectric driving arm by using leads, and the leads extend from the outer frame to one of the second hinges, and extend to the second thermoelectric driving arm along the second hinge.

An end that is of the second thermoelectric driving arm and that is connected to the lens is the second connection end, and a center of the second connection end is located on the second rotation axis.

There are at least two second connection ends, and the at least two second connection ends are symmetrically distributed by using the second rotation axis as a center, so that a center of the second connection ends is located on the second rotation axis. In this way, the second driver module can apply uniform force to the lens.

Specifically, the first electrode end is connected to a surface of the outer frame, and the first connection end is connected to a surface of the inner frame. Because a thermoelectric driving arm is additionally made on a surface of a silicon material (the inner frame and a surface of the lens belong to a base structure) by using a semiconductor technology, the first connection end is located on the surface of the inner frame. Likewise, the second electrode end is connected to a surface of the inner frame, and the second connection end is connected to a surface of the lens.

In an implementation, the inner frame is of an axisymmetrical structure, and both the first rotation axis and the second rotation axis form symmetry axes of the inner frame. The inner frame may be of any axisymmetrical structure, for example, in a square frame shape or in a circular ring shape.

According to a second aspect, an embodiment of this application provides a micromirror array chip, including a plurality of micromirror structures, distributed in arrays, according to any one of the foregoing implementations.

The micromirror array chip is divided into a plurality of areas distributed in arrays, the plurality of areas distributed in arrays include a first area and a second area that are disposed adjacent to each other, a distribution direction of the micromirror structure in the first area is mirror-symmetric to a distribution direction of the micromirror structure in the second area.

This application relates to a micromirror structure and a micromirror array chip that are core devices in the optical switching field. <FIG> is a schematic structural diagram of a 3D-MEMS optical switching module (namely, an MEMS photonic switch <NUM>) on which a micromirror array chip is located according to this application. The MEMS photonic switch <NUM> includes a first lens array <NUM> and a second lens array <NUM>. Light enters through a collimator array <NUM> (for example, light is led from an optical fiber), and is projected on a micromirror in the first lens array <NUM>. An angle of the micromirror in the first lens array <NUM> is adjusted, to enable the light to be further projected on a proper micromirror in the second lens array <NUM>. The micromirror in the second lens array <NUM> is associated with a specific output port in a collimator array <NUM>. An angle of the micromirror in the lens array <NUM> is adjusted, to enable the micromirror in the lens array <NUM> to be coupled to a proper output port in the collimator array <NUM>. Then, the light is emitted from a collimator in the collimator array <NUM> (for example, coupled to an optical fiber). Similarly, light may be input from one side of the collimator array <NUM>, reflected from a micromirror in the second lens array <NUM> to a micromirror in the first lens array <NUM>, further reflected to the collimator array <NUM>, and emitted. The micromirror structure and the micromirror array chip that are provided in this application are applied to the first lens array <NUM> or the second lens array <NUM>.

Referring to <FIG>, a micromirror structure provided in an embodiment of this application includes an outer frame <NUM>, an inner frame <NUM>, a lens <NUM>, a pair of first hinges <NUM>, a pair of second hinges <NUM>, a first driver module, and a second driver module. The lens <NUM> is located in enclosed space of the inner frame <NUM>, and the inner frame <NUM> is located in enclosed space of the outer frame <NUM>. The lens <NUM>, the inner frame <NUM>, and the outer frame <NUM> form a layer-by-layer nesting architecture, and a gap is maintained between the lens <NUM>, the inner frame <NUM>, and the outer frame <NUM>, to accommodate the first hinges <NUM>, the second hinges <NUM>, the first driver module, and the second driver module. In a specific implementation, the outer frame <NUM> may be formed by digging a hole on a base board, and a material of the outer frame <NUM> may be a silicon material. The enclosed space of the outer frame <NUM> may be rectangular. A plurality of accommodation holes distributed in arrays may be disposed on one base board. These accommodation holes are used as the enclosed space of the outer frame <NUM>. The inner frame <NUM>, the lens <NUM>, the first hinges <NUM>, the second hinges <NUM>, the first driver module, and the second driver module are disposed in the accommodation holes.

The inner frame <NUM> is of an enclosed ring-shaped structure, and may be of an axisymmetrical structure, for example, in a rectangular shape or a circular shape (it may be understood that a shape of the inner frame <NUM> may be any other shape and is not limited in this application). A material of the inner frame <NUM> may be the same as the material of the outer frame <NUM>, and the inner frame <NUM> is of a rigid structure.

The pair of first hinges <NUM> is respectively located at two opposite ends of the lens <NUM>, the pair of first hinges <NUM> is connected between the lens <NUM> and an inner wall of the inner frame <NUM>, and a connection line of the pair of first hinges <NUM> forms a first rotation axis A1. The first hinges <NUM> are of a structure similar to a rotation axis or hinge, and can implement rotation of the lens <NUM> relative to the inner frame <NUM>. In a direction other than a rotation direction, the first hinges <NUM> can ensure a rigid connection between the lens <NUM> and the inner frame <NUM>, to prevent the lens <NUM> from offsetting relative to the inner frame <NUM>, thereby ensuring deflection precision of the lens <NUM>.

The pair of second hinges <NUM> is respectively located at two opposite ends of the inner frame <NUM>, the pair of second hinges <NUM> is connected between an outer wall of the inner frame <NUM> and an inner wall of the outer frame <NUM>, a connection line of the pair of second hinges <NUM> forms a second rotation axis A2, and the first rotation axis A1 is perpendicular to the second rotation axis A2. The second hinges <NUM> are of a structure similar to a rotation axis or hinge, and can implement rotation of the inner frame <NUM> relative to the outer frame <NUM>. In a direction other than a rotation direction, the second hinges <NUM> can ensure a rigid connection between the inner frame <NUM> and the outer frame <NUM>, to prevent the inner frame <NUM> from offsetting relative to the outer frame <NUM>, thereby ensuring deflection precision of the lens <NUM>.

Specifically, the inner frame <NUM> is of an axisymmetrical structure, and both the first rotation axis A1 and the second rotation axis A2 form symmetry axes of the inner frame <NUM>. The inner frame <NUM> may be of any axisymmetrical structure, for example, in a square frame shape or in a circular ring shape. In embodiments shown in <FIG> and <FIG>, the inner frame <NUM> is in a rectangular frame shape, and includes four sides perpendicular to each other, and the first rotation axis A1 and the second rotation axis A2 each are a midline of two adjacent sides.

In an implementation, the lens <NUM> is an MEMS micromirror, and the lens <NUM> is circular. In another implementation, the lens <NUM> may be rectangular. When the lens <NUM> is circular, the first rotation axis A1 coincides with a diameter of the lens <NUM>. When the lens <NUM> is square, the first rotation axis A1 coincides with a midline of the lens <NUM>. It should be understood that the lens <NUM> may be in any shape. This is not limited in this application.

The first driver module is connected to the inner frame <NUM>, to drive the inner frame <NUM>, together with the lens <NUM>, to rotate by using the second rotation axis A2 as a center. The second driver module is connected to the lens <NUM>, to drive the lens <NUM> to rotate by using the first rotation axis A1 as a center. In this embodiment of this application, the inner frame <NUM> is disposed between the lens <NUM> and the outer frame <NUM>, the pair of first hinges <NUM> is connected between the inner frame <NUM> and the lens <NUM> to form the first rotation axis A1, the pair of second hinges <NUM> is connected between the inner frame <NUM> and the outer frame <NUM> to from the second rotation axis A2, and the first rotation axis A1 is perpendicular to the second rotation axis A2, so that the lens <NUM> cannot displace in a direction perpendicular to the lens <NUM> because the lens <NUM> is constrained by the pair of first hinges <NUM> when the lens <NUM> rotates around the first rotation axis A1, and the lens <NUM> cannot displace in the direction perpendicular to the lens <NUM> because the lens <NUM> is constrained by the pair of second hinges <NUM> when the lens <NUM> rotates around the second rotation axis A2. This can ensure that the lens <NUM> is more precisely positioned in a deflection process.

In an implementation, the pair of first hinges <NUM> implements a rigid connection between the lens <NUM> and the inner frame <NUM> in a direction of the first rotation axis A1, so that no displacement occurs between the inner frame <NUM> and the lens <NUM> when the first driver module drives the inner frame <NUM>, together with the lens <NUM>, to rotate by using the second rotation axis A2 as a center, thereby ensuring a precise position of the lens <NUM>. In addition, the pair of first hinges <NUM> implements the rigid connection between the lens <NUM> and the inner frame <NUM> in the direction of the first rotation axis A1, so that fixedness of a position of the first rotation axis A1 can be determined. If the first hinges <NUM> are flexibly connected between the lens <NUM> and the inner frame <NUM> in the direction of the first rotation axis A1, when the second driver module drives the lens <NUM> to rotate by using the first rotation axis A1 as a center, the position of the first rotation axis A1 very easily changes due to elastic deformation of the first hinges <NUM> (the position change may be referred to as an unwanted offset, and a direction and a displacement of the position change are uncertain). Consequently, the lens <NUM> is imprecisely positioned.

In an implementation, the pair of second hinges <NUM> implements a rigid connection between the inner frame <NUM> and the outer frame <NUM> in a direction of the second rotation axis A2, in order that fixedness of a position of the second rotation axis A2 can be determined, so that the lens <NUM> is precisely positioned when the lens <NUM> rotates around the second rotation axis A2.

In a process in which the lens <NUM> rotates by using the first rotation axis A1 as a center, a deflection position of the lens <NUM> is maintained through elastic deformation of the pair of first hinges <NUM>. In other words, in a rotation direction of the first hinges <NUM>, the first hinges <NUM> are flexibly connected between the inner frame <NUM> and the lens <NUM>.

In a process in which the inner frame <NUM>, together with the lens <NUM>, rotates by using the second rotation axis A2 as a center, a deflection position of the inner frame <NUM> together with the lens <NUM> is maintained through elastic deformation of the pair of second hinges <NUM>. In other words, in a rotation direction of the second hinges <NUM>, the second hinges <NUM> are flexibly connected between the inner frame <NUM> and the outer frame <NUM>.

The first driver module and the second driver module are configured to drive the lens <NUM> to deflect. In this embodiment of this application, the lens <NUM> is driven to deflect in a thermoelectric driving manner. Specific descriptions are as follows:.

In an implementation, the first driver module includes a first thermoelectric driving arm <NUM>, the first thermoelectric driving arm <NUM> is connected between the outer frame <NUM> and the inner frame <NUM>, an end that is of the first thermoelectric driving arm <NUM> and that is connected to the inner frame <NUM> is a first connection end <NUM>, and a center of the first connection end <NUM> is located on the first rotation axis A1. In this embodiment, the first driver module is designed as a thermoelectric driving arm. When the first thermoelectric driving arm <NUM> is heated, the first thermoelectric driving arm <NUM> deforms, so that the first connection end <NUM> displaces in the direction perpendicular to the lens <NUM>. The first rotation axis A1 is set to a direction X, the second rotation axis A2 is set to a direction Y, and the direction perpendicular to the lens <NUM> is a direction Z. In this implementation, the first connection end <NUM> of the first thermoelectric driving arm <NUM> is moved in the direction Z, to drive the inner frame <NUM>, together with the lens <NUM>, to rotate by using the second rotation axis A2 as a center.

In an implementation, as shown in <FIG>, there is one first connection end <NUM>, and the first connection end <NUM> is located on the first rotation axis A1. Specifically, the first thermoelectric driving arm <NUM> includes a first electrode end <NUM>, a first elastic arm <NUM>, and the first connection end <NUM>, the first electrode end <NUM> and the first connection end <NUM> are respectively located on two sides of the first elastic arm <NUM>, the first electrode end <NUM> is configured to be electrically connected to a first electrode <NUM> disposed on the outer frame <NUM>, to apply a voltage or a current to the first thermoelectric driving arm <NUM>. Under the action of a voltage difference and a current, the first elastic arm <NUM> thermally deforms, to drive the first connection end <NUM> to move in the direction Z. In this implementation, the first elastic arm <NUM> is in a packaged ring-shaped structure.

In an implementation, as shown in <FIG>, there are at least two first connection ends <NUM>, and the at least two first connection ends <NUM> are symmetrically distributed by using the first rotation axis A1 as a center, so that a center of the first connection ends <NUM> is located on the first rotation axis A1. This is beneficial for the first thermoelectric driving arm <NUM> to apply uniform force to the inner frame <NUM>. Specifically, in this implementation, the first thermoelectric driving arm <NUM> includes a first electrode end <NUM>, two first elastic arms <NUM>, and two first connection ends <NUM>, ends of the two first elastic arms <NUM> are respectively connected to the two first connection ends <NUM>, and the other ends of the two first elastic arms <NUM> are both connected to the first electrode end <NUM>.

In an implementation, the first driver module further includes the first electrode <NUM>, the first electrode <NUM> is disposed on the outer frame <NUM>, and the first electrode <NUM> is electrically connected to the first thermoelectric driving arm <NUM>. Specifically, the first electrode <NUM> is electrically connected to the first electrode end <NUM>, the outer frame <NUM> may be designed as a circuit board, and the first electrode <NUM> is connected to the first electrode end <NUM> by using cables <NUM> and <NUM> on the circuit board.

Specifically, a center of the first electrode end <NUM> is located on an extension line of the first rotation axis A1. The first electrode <NUM> includes a positive electrode <NUM> and a negative electrode <NUM>, and the first thermoelectric driving arm <NUM> is connected in series between the positive electrode <NUM> and the negative electrode <NUM>, to form a loop. The first electrode <NUM> applies a voltage or a current to the first thermoelectric driving arm <NUM>, so that the first elastic arm <NUM> thermally deforms, and an end that is of the first elastic arm <NUM> and that is connected to the first connection end <NUM> moves in the direction Z. Specifically, a material of the first elastic arm <NUM> includes a multilayer metal film and a dielectric film, includes two materials that are used to generate displacement and that have different thermal expansion coefficients, for example, Cu and SiO2 (or Al and SiO2), and also includes a heating resistor layer used to generate temperature, for example, W, Ti, Pt, or polycrystalline silicon. Two ends of the heating resistor layer are respectively electrically connected to the positive electrode <NUM> and the negative electrode <NUM>. When power is injected into the first electrode <NUM>, heat is generated on the heating resistor layer to cause a temperature change. Because the two materials having the different thermal expansion coefficients exist on the first elastic arm <NUM>, an expansion difference between the two materials changes, causing a change in a deformation of the first elastic arm <NUM>. Consequently, the first connection end <NUM> displaces.

The first electrode end <NUM> includes two terminals respectively electrically connected to the positive electrode <NUM> and the negative electrode <NUM>. When there are one first elastic arm <NUM> and one first connection end <NUM>, the first elastic arm <NUM> continuously extends between the two terminals of the first electrode end <NUM>, and the first connection end <NUM> is located at a midpoint of the first elastic arm <NUM>. When there are two first elastic arms <NUM> and two first connection ends <NUM>, one of the first elastic arms <NUM> is connected between one of the terminals and one of the first connection ends <NUM>, and the other first elastic arm <NUM> is connected between the other terminal and the other first connection end <NUM>.

The second driver module includes a second thermoelectric driving arm <NUM>, the second thermoelectric driving arm <NUM> is connected between the inner frame <NUM> and the lens <NUM>, an end that is of the second thermoelectric driving arm <NUM> and that is connected to the inner frame <NUM> is a second electrode end <NUM>, and a center of the second electrode end <NUM> is located on an extension line of the second rotation axis A2. Specifically, the second thermoelectric driving arm <NUM> includes the second electrode end <NUM>, a second connection end <NUM>, and a second elastic arm <NUM> connected between the second electrode end <NUM> and the second connection end <NUM>, the second electrode end <NUM> is connected to the inner frame <NUM>, and the second connection end <NUM> is connected to the lens <NUM>. An architecture of the second driver module may be the same as that of the first driver module, but only disposing positions are different. The second driver module is disposed between the inner frame <NUM> and the lens <NUM>.

In an implementation, the second driver module further includes a second electrode <NUM>, the second electrode <NUM> is disposed on the outer frame <NUM>, and the second electrode <NUM> is electrically connected to the second thermoelectric driving arm <NUM>. Specifically, the second electrode <NUM> is electrically connected to the second electrode end <NUM>. The second electrode <NUM> also includes a positive electrode <NUM> and a negative electrode <NUM>, and the second electrode end <NUM> also includes two terminals. Respectively by using leads, the positive electrode <NUM> of the second electrode <NUM> is electrically connected to one terminal of the second electrode end <NUM>, and the negative electrode <NUM> of the second electrode <NUM> is electrically connected to the other terminal of the second electrode end <NUM>.

In an implementation, the second electrode end <NUM> and one of the second hinges <NUM> are respectively disposed on two sides of the inner frame <NUM> oppositely, that is, the second electrode end <NUM> is located on an extension line of the second hinge <NUM>. In other words, the second hinge <NUM> is located on the second rotation axis A2. The second electrode <NUM> is electrically connected to the second thermoelectric driving arm <NUM> by using leads <NUM> and <NUM>, and the leads <NUM> and <NUM> extend from the outer frame <NUM> to one of the second hinges <NUM>, and extend to the second thermoelectric driving arm <NUM> along the second hinge <NUM>.

In an implementation, an end that is of the second thermoelectric driving arm <NUM> and that is connected to the lens <NUM> is the second connection end <NUM>, and the center of the second connection end <NUM> is located on the second rotation axis A2, so that more uniform force can be applied to the lens <NUM>.

In an implementation, as shown in <FIG>, there are at least two second connection ends <NUM>, and the at least two second connection ends <NUM> are symmetrically distributed by using the second rotation axis A2 as a center, so that a center of the second connection ends <NUM> is located on the second rotation axis A1. Correspondingly, there are at least two second elastic arms <NUM>, and the at least two second elastic arms <NUM> are respectively connected between the at least two second connection ends <NUM> and the second electrode end <NUM>. In this way, the second driver module can apply uniform force to the lens <NUM>.

Specifically, the first electrode end <NUM> is connected to a surface of the outer frame <NUM>, and the first connection end <NUM> is connected to a surface of the inner frame <NUM>. Because a thermoelectric driving arm is additionally made on a surface of a silicon material (the inner frame <NUM> and the lens <NUM> belong to a base structure) by using a semiconductor technology, the first connection end <NUM> is located on the surface of the inner frame <NUM>. Likewise, the second electrode end <NUM> is connected to a surface of the inner frame <NUM>, and the second connection end <NUM> is connected to a surface of the lens <NUM>.

An embodiment of this application provides a micromirror array chip, including a plurality of micromirror structures distributed in arrays. Specifically, outer frames <NUM> of all the micromirror structures are interconnected as a whole, a plurality of accommodation holes distributed in arrays may be disposed on a same base board, and one inner frame <NUM> and one lens <NUM> are disposed in each accommodation hole.

In an implementation, the micromirror array chip is divided into a plurality of areas distributed in arrays, the plurality of areas distributed in arrays include a first area and a second area that are disposed adjacent to each other, a distribution direction of the micromirror structure in the first area is mirror-symmetric to a distribution direction of the micromirror structure in the second area. Each area may include a plurality of micromirror structures distributed in an array. Referring to <FIG>, the micromirror array chip is divided into four areas S1, S2, S3, and S4. Areas adjacent to the area S1 are the area S2 and the area S3. A distribution direction of the micromirror structure in the area S1 is mirror-symmetric to a distribution direction of the micromirror structure in the area S2 by using a first boundary line X1 as a center, and the first boundary line X1 is located between the areas S1 and S2. The distribution direction of the micromirror structure in the area S1 is mirror-symmetric to a distribution direction of the micromirror structure in the area S3 by using a second boundary line X2 as a center, and the second boundary line X2 is located between the areas S1 and S3. The first boundary line X1 is perpendicular to the second boundary line X2. Micromirror structures in each of the areas S1, S2, S3, and S4 are distributed in a 2x2 array.

The micromirror array chip may be divided into more areas, and is not limited to the four areas S1, S2, S3, and S4, and the micromirror structures in each area may be alternatively distributed in another array layout, for example, distributed in a 3x3 array, or distributed in a 4x4 array.

Referring to <FIG>, it can be seen from a diagram of a relationship between a deflection angle and power consumption of a lens, there is an area with low power consumption for the deflection angle of the lens. In the implementation shown in <FIG>, deflection angles of lenses of micromirror structures in the four areas S1, S2, S3, and S4 all need to be in a low power consumption state. Therefore, in this embodiment of this application, a micromirror array chip layout with low power consumption can be implemented.

Claim 1:
A micromirror structure, comprising an outer frame (<NUM>), an inner frame (<NUM>), a lens (<NUM>), a pair of first hinges (<NUM>), a pair of second hinges (<NUM>), a first driver module, and a second driver module, wherein the lens (<NUM>) is a MEMS micromirror, wherein the pair of first hinges (<NUM>) is respectively located at two opposite ends of the lens (<NUM>), the pair of first hinges (<NUM>) is connected between the lens (<NUM>) and an inner wall of the inner frame (<NUM>), and a connection line of the pair of first hinges (<NUM>) forms a first rotation axis (A1); the pair of second hinges (<NUM>) is respectively located at two opposite ends of the inner frame (<NUM>), the pair of second hinges (<NUM>) is connected between an outer wall of the inner frame (<NUM>) and an inner wall of the outer frame (<NUM>), a connection line of the pair of second hinges (<NUM>) forms a second rotation axis (A2), and the first rotation axis (A1) is perpendicular to the second rotation axis (A2); the first driver module is connected to the inner frame (<NUM>), to drive the inner frame (<NUM>), together with the lens (<NUM>), to rotate by using the second rotation axis (A2) as a center; and the second driver module is connected to the lens (<NUM>), to drive the lens (<NUM>) to rotate by using the first rotation axis (A1) as a center,
characterized in that
the first driver module comprises a first thermoelectric driving arm (<NUM>), the first thermoelectric driving arm (<NUM>) is connected between the outer frame (<NUM>) and the inner frame (<NUM>), an end that is of the first thermoelectric driving arm (<NUM>) and that is connected to the inner frame (<NUM>) is a first connection end (<NUM>), and a center of the first connection end (<NUM>) is located on the first rotation axis (A1), wherein when the first thermoelectric driving arm (<NUM>) is heated, the first thermoelectric driving arm (<NUM>) deforms, so that the first connection end (<NUM>) displaces in a direction perpendicular to the lens (<NUM>), wherein the first connection end (<NUM>) of the first thermoelectric driving arm (<NUM>) is moved to drive the inner frame (<NUM>), together with the lens <NUM>, to rotate by using the second rotation axis (A2) as a center.