SENSOR, SENSOR SYSTEM, AND ELECTRONIC DEVICE

According to one embodiment, a sensor includes a base including a first face, a fixed portion fixed to the first face, and a movable portion supported by the fixed portion. The movable portion includes a plurality of annular portions, a plurality of connect portions, and a first structure. Each of the plurality of annular portions is provided around the fixed portion with the fixed portion as a center in a first plane along the first face. One of the plurality of connect portions connects two of the plurality of annular portions to each other. The plurality of annular portions include a first annular portion. The first annular portion is outermost of the plurality of annular portions. The first structure is connected to the first annular portion. The first annular portion is provided between the fixed portion and the first structure.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2023-139069, filed on Aug. 29, 2023; the entire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a sensor, a sensor system, and an electronic device.

BACKGROUND

For example, there are sensors having a MEMS (Micro Electro Mechanical Systems) structure. In some cases, electronic devices and the like are controlled based on information obtained by sensors. It is desired to improve the characteristics of sensors.

DETAILED DESCRIPTION

According to one embodiment, a sensor includes a base including a first face, a fixed portion fixed to the first face, and a movable portion supported by the fixed portion. A first gap is provided between the first face and the movable portion. The movable portion includes a plurality of annular portions, a plurality of connect portions, and a first structure. Each of the plurality of annular portions is provided around the fixed portion with the fixed portion as a center in a first plane along the first face. The plurality of connect portions extend along a radial direction. The radial direction passes through a first center of the fixed portion in the first plane and is along the first plane. One of the plurality of connect portions connects two of the plurality of annular portions to each other. The plurality of annular portions include a first annular portion. The first annular portion is outermost of the plurality of annular portions. The first structure is connected to the first annular portion. The first annular portion is provided between the fixed portion and the first structure. A first structure length of the first structure in the radial direction is longer than a first annular portion length of the first annular portion in the radial direction.

First Embodiment

FIG.1is a schematic plan view illustrating a sensor according to a first embodiment.

FIGS.2and3are schematic cross-sectional views illustrating the sensor according to the first embodiment.

FIG.2is a sectional view taken along the line A1-A2inFIG.1.FIG.3is a sectional view taken along the line A3-A4inFIG.1.

FIG.4is a schematic plan view illustrating a part of the sensor according to the first embodiment.

InFIG.4, a part ofFIG.1is shown enlarged.

As shown inFIGS.1to3, a sensor110according to the embodiment includes a base50s, a fixed portion10F, and a movable portion10M.

The base50sincludes a first face50a. The fixed portion10F is fixed to the first face50a. The movable portion10M is supported by the fixed portion10F.

As shown inFIGS.2and3, a first gap G1is provided between the first face50aand the movable portion10M. For example, an insulating member55is provided on the first face50a. The fixed portion10F is provided on the insulating member55. The insulating member55is not provided between the first face50aand the movable portion10M.

The movable portion10M is electrically conductive. The movable portion10M may include, for example, conductive silicon. The fixed portion10F is electrically conductive. The fixed portion10F may include, for example, conductive silicon. The fixed portion10F is electrically connected to the movable portion10M. The insulating member55may include, for example, silicon oxide.

The movable portion10M includes a plurality of annular portions10, a plurality of connect portions20, and a first structure41. Each of the plurality of annular portions10is provided around the fixed portion10F with the fixed portion10F as a center on the first plane PL1along the first face50a.

A direction perpendicular to the first plane PL1is defined as a Z-axis direction. One direction perpendicular to the Z-axis direction is defined as an X-axis direction. A direction perpendicular to the Z-axis direction and the X-axis direction is defined as a Y-axis direction. The first plane PL1is parallel to the X-Y plane.

For example, each of the plurality of annular portions10is concentric with the fixed portion10F as the center. Each of the plurality of annular portions10extends along a circular circumferential direction Dc.

For example, the plurality of annular portions10include a first annular portion11. The first annular portion11is the outermost of the plurality of annular portions10. The plurality of annular portions10may include a second annular portion12, a third annular portion13, a fourth annular portion14, a fifth annular portion15, a sixth annular portion16, and the like. The number of the plurality of annular portions10is arbitrary.

For example, the second annular portion12is provided between the first annular portion11and the fixed portion10F. The second annular portion12is next to the first annular portion11. The second annular portion12is closest to the first annular portion11among the plurality of annular portions10.

The plurality of connect portions20extend along a radial direction Dr. The radial direction Dr passes through the first center10C of the fixed portion10F in the first plane PL1and extends along the first plane PL1. One of the plurality of connect portions20connects two of the plurality of annular portions10to each other.

For example, the plurality of connect portions20include a first connect portion21. The first connect portion21is provided between the second annular portion12and the first annular portion11. The first connect portion21connects the second annular portion12and the first annular portion11to each other. The plurality of connect portions20may include a second connect portion22, a third connect portion23, a fourth connect portion24, a fifth connect portion25, a sixth connect portion26, and the like. The number of the plurality of connect portions20is arbitrary.

The first structure41is connected to the first annular portion11. The first annular portion11is provided between the fixed portion10F and the first structure41. The first structure41is provided outside the first annular portion11.

FIG.4shows an enlarged example of a portion including the first structure41. As shown inFIG.4, a length of the first structure41in the radial direction Dr is defined as a first structure length w41. A length of the first annular portion11in the radial direction Dr is defined as a first annular portion length w11. The first structure length w41is longer than the first annular portion length w11. For example, the first structure41functions as a mass member.

As shown inFIG.1, a plurality of fixed electrodes30are provided in the sensor110. For example, the plurality of fixed electrodes30are fixed to the first face50a. For example, a signal including an alternating component is applied between a part of the plurality of fixed electrodes30and the movable portion10M. Thereby, the movable portion10M vibrates. When an external force is applied to the movable portion10M vibrating, the vibration state changes. By detecting the change in the vibration state, the applied external force can be detected. The change in the vibration state is detected as a change in capacitance, for example. The change in the vibration state due to external forces are caused by, for example, Coriolis force. The change in the vibration state can be detected, for example, by another part of the plurality of fixed electrodes30. The signal may be supplied by a controller70, for example. For example, the controller70may detect the change in the vibration state.

In the embodiment, the first structure41is provided that functions as the mass member. By providing the first structure41, for example, vibration of the movable portion10M is stabilized. Vibration of a noise component is suppressed. Thereby, noise can be suppressed in the obtained signal. Highly accurate detection becomes possible.

In the embodiment, the first structure41is provided outside the first annular portion11. The width of the first structure41(first structure length w41) can be increased. The mass of the first structure41can be increased. Thereby, a component that becomes unnecessary noise in the vibration of the movable portion10M is suppressed. Thereby, higher precision detection can be performed.

For example, in a first reference example, a weight is provided between the first annular portion11and the second annular portion12. In this case, the width of the weight cannot exceed the distance between the first annular portion11and the second annular portion12. Therefore, in the first reference example, it is difficult to increase the mass of the weight. In contrast, in the embodiment, the first structure41functioning as a mass member is provided outside the first annular portion11. It is easy to increase the width of the first structure41(first structure length w41). The mass of the first structure41can be increased. Thereby, higher precision detection can be performed. According to the embodiment, it is possible to provide a sensor whose characteristics can be improved.

As already explained, in the sensor110, the plurality of annular portions10may include the second annular portion12. The second annular portion12is provided between the fixed portion10F and the first annular portion11. The second annular portion12is closest to the first annular portion11among the plurality of annular portions10. A distance between the second annular portion12and the first annular portion11in the radial direction Dr is defined as a first distance d11(seeFIG.4). The first distance d11corresponds to, for example, the distance between the plurality of annular portions10. The first distance d11may substantially correspond to the pitch of the plurality of annular portions10, for example.

In the embodiment, for example, the first structure length w41is longer than the first distance d11. Thus, in the sensor110, the first structure length w41can be made longer than the pitch. Large mass can be obtained.

As shown inFIG.4, the first structure41may include a first structure component41pand a first structure connect portion41a. The first structure connect portion41ais provided between the first annular portion11and the first structure component41p. The first structure connect portion41aconnects the first structure component41pto the first annular portion11. A length of the first structure connect portion41ain the circumferential direction Dc centered on the fixed portion10F along the first face50ais defined as a first structure connect portion length L41a. A length of the first structure component41pin the circumferential direction Dc is defined as a first structure component length L41p. The first structure connect portion length L41ais shorter than the first structure component length L41p.

The first structure component length L41pis connected to the first annular portion11by the first structure connect portion41abeing narrow. By such a structure, a high degree of freedom can be obtained in the movement of the first structure component41p. For example, in the first annular portion11, the uniformity of vibration characteristics can be improved. Noise can be further suppressed. Detection with higher accuracy becomes possible.

As shown inFIG.1, the movable portion10M may include a plurality of first structures41. The plurality of first structures41are provided around the first annular portion11on the first plane PL1. The plurality of first structures41are arranged along the circumferential direction Dc. The circumferential direction Dc is a direction along the circumference around the fixed portion10F along the first plane PL1.

As shown inFIG.1, the plurality of fixed electrodes30are provided in the sensor110. In this example, the plurality of fixed electrodes30include, for example, a first fixed electrode31, a second fixed electrode32, a third fixed electrode33, a fourth fixed electrode34, a fifth fixed electrode35, and a sixth fixed electrode36. The first fixed electrode31is provided between the first annular portion11and the second annular portion12. The second fixed electrode32is provided between the second annular portion12and the third annular portion13. The third fixed electrode33is provided between the third annular portion13and the fourth annular portion14. The fourth fixed electrode34is provided between the fourth annular portion14and the fifth annular portion15. The fifth fixed electrode35is provided between the fifth annular portion15and the sixth annular portion16. The sixth fixed electrode36is provided between the sixth annular portion16and the fixed portion10F.

In this example, a plurality of first fixed electrodes31are provided. The plurality of first fixed electrodes31are fixed to the first face50a. The plurality of first fixed electrodes31are provided between the second annular portion12and the first annular portion11. The plurality of first fixed electrodes31are arranged along the circumferential direction Dc. In this example, the number of the plurality of first fixed electrodes31(first fixed electrode number) is eight. For example, it is possible to generate vibrations along each of two crossing directions parallel to the first plane PL1and to detect the vibrations. Furthermore, by correcting the resonant frequency of the vibration, more accurate detection can be performed.

The number of the plurality of first structures41(first structure number) is larger than the number of the plurality of first fixed electrodes31(first fixed electrode number). It is preferable that the first structure number is, for example, an integral multiple of two or more than the first fixed electrode number. The first structure number may be, for example, four times the first fixed electrode number. For example, high symmetry can be obtained in the movable portion10M. More stable vibration can be obtained. In the embodiment, the first fixed electrode number may be eight or more.

Thus, the sensor110includes the base50sincluding the first face50a, the fixed portion10F fixed to the first face50a, and the movable portion10M supported by the fixed portion10F. The first gap G1is provided between the first face50aand the movable portion10M. The movable portion10M includes the plurality of annular portions10, the plurality of connect portions20, and the plurality of first structures41. Each of the plurality of annular portions10is provided around the fixed portion10F with the fixed portion10F as the center on the first plane PL1along the first face50a. The plurality of connect portions20extend along the radial direction Dr. The radial direction Dr passes through the first center10C of the fixed portion10F in the first plane PL1and extends along the first plane PL1. One of the plurality of connect portions20connects two of the plurality of annular portions10to each other. The plurality of annular portions10include the first annular portion11. The first annular portion11is the outermost of the plurality of annular portions10. The plurality of first structures41are connected to the first annular portion11. The first annular portion11is provided between the fixed portion10F and the plurality of first structures41.

In the embodiment, the plurality of first structures41and the first annular portion11may satisfy at least one of a first condition, a second condition, or a third condition. In the first condition, a sum (first sum) of the areas in the first plane PL1of each of the plurality of first structures41is larger than an area (first annular portion area) in the first plane PL1of the first annular portion11. In the second condition, a sum (second sum) of the volumes of each of the plurality of first structures41is larger than a volume (first annular portion volume) of the first annular portion11. In the third condition, a sum (third sum) of the masses of each of the plurality of first structures41is larger than a mass (first annular portion mass) of the first annular portion11.

The plurality of first structures41that satisfy such conditions function as a mass member. Such the plurality of first structures41are provided outside the first annular portion11. The mass of the plurality of first structures41can be increased. Noise is suppressed and highly accurate detection is possible.

FIG.5is a schematic plan view illustrating a sensor according to the first embodiment.

FIG.6is a schematic plan view illustrating a part of the sensor according to the first embodiment.

As shown inFIGS.5and6, in a sensor111according to the embodiment, the first structure41is connected to the first annular portion11by a plurality of structure connect portions. The configuration of the sensor111except for this may be the same as the configuration of the sensor110.

As shown inFIG.6, the first structure41includes a first structure component41p, a first structure connect portion41a, and a second structure connect portion41b. The first structure connect portion41ais provided between the first annular portion11and the first structure component41p, and connects the first structure component41pto the first annular portion11. The second structure connect portion41bis provided between the first annular portion11and the first structure component41p, and connects the first structure component41pto the first annular portion11. A direction from the first structure connect portion41ato the second structure connect portion41bis along the circumferential direction Dc.

A first structure connect portion length L41aof the first structure connect portion41ain the circumferential direction Dc is shorter than a first structure component length L41pof the first structure component41pin the circumferential direction Dc. A second structure connect portion length L41bof the second structure connect portion41bin the circumferential direction Dc is shorter than the first structure component length L41p.

A second gap G2is provided between the first structure connect portion41aand the second structure connect portion41b. For example, stable mechanical strength can be obtained by providing a plurality of structure connect portions. By providing the second gap G2between the plurality of structure connect portions, processing through the second gap G2becomes easier. High accuracy can be obtained in the movable portion10M. Detection with higher accuracy becomes possible.

As shown inFIGS.5and6, the sensor111may also further include the first fixed electrode31. The first fixed electrode31is fixed to the first face50a(seeFIG.3). The plurality of annular portions10may include the second annular portion12. The second annular portion12is provided between the fixed portion10F and the first annular portion11. The second annular portion12is closest to the first annular portion11among the plurality of annular portions10. The first fixed electrode31is provided between the second annular portion12and the first annular portion11. In the sensor111, the controller70(seeFIGS.2and3) may be provided. The controller70is configured to apply the electric signal between the fixed portion10F and the first fixed electrode31.

As shown inFIG.6, the plurality of connect portions20include a first connect portion21. The first connect portion21is provided between the second annular portion12and the first annular portion11. The first connect portion21connects the second annular portion12and the first annular portion11to each other. The first connect portion21extends along the radial direction Dr.

As shown inFIG.6, the movable portion10M may further include the second structure42. The second structure42is provided between the second annular portion12and the first annular portion11. The second structure42is connected to the first connect portion21. A direction from the first fixed electrode31to the second structure42is along the circumferential direction Dc.

The second structure42functions as a mass member, for example. Noise is further suppressed. Detection with higher accuracy becomes possible.

FIG.7is a schematic plan view illustrating a sensor according to the first embodiment.

FIG.7illustrates the fixed portion10F and the movable portion10M. In a sensor120according to the embodiment, at least one of the plurality of fixed electrodes30includes a plurality of partial electrodes. The configuration of the sensor120except for this may be the same as the configuration of the sensor110and the like.

In this example, at least one of the plurality of fixed electrodes30is the second fixed electrode32. The second fixed electrode32includes a plurality of partial electrodes. The plurality of partial electrodes include a first partial electrode30aand a second partial electrode30b. The first partial electrode30aand the second partial electrode30bare arranged in the circumferential direction Dc. In this example, two of the second partial electrode30bare provided. The first partial electrode30ais provided between two partial electrodes in the circumferential direction Dc. Different signals may be supplied to the plurality of partial electrodes. A signal obtained from the plurality of partial electrodes may be processed to perform detection.

As shown inFIG.7, the movable portion10M may further include a first radial structure28p. The first radial structure28pis connected to one of the plurality of annular portions10. In this example, the first radial structure28pis connected to the fourth annular portion14. The first radial structure28pextends from the one of the plurality of annular portions10along a first radial direction Dr1. The first radial structure28pis separated from another one of the plurality of annular portions10in the first radial direction Dr1. In this example, the first radial structure28pis separated from the fifth annular portion15in the first radial direction Dr1. The other one of the plurality of annular portions10is next to the one of the plurality of annular portions10among the plurality of annular portions10. The other one of the plurality of annular portions10is closest to the one of the plurality of annular portions10among the plurality of annular portions10.

The movable portion10M may further include a second radial structure28q. The second radial structure28qis connected to the other one of the plurality of annular portions10. The second radial structure28qis connected to the fifth annular portion15. The second radial structure28qextends from the other one of the plurality of annular portions10toward the one of the plurality of annular portions10along the first radial direction Dr1. The second radial structure28qextends from the fifth annular portion15toward the fourth annular portion14along the first radial direction Dr1. The second radial structure28qis separated from the first radial structure28pin the first radial direction Dr1.

By providing such a radial structure, the overall mass distribution can be made uniform without connecting adjacent annular portions. It becomes easier to obtain higher characteristics.

As shown inFIG.7, in this example, a direction in which the second connect portion22extends (first radial direction Dr1) is along a direction in which the third connect portion23extends. For example, it becomes easier to obtain a detection signal with high intensity.

As shown inFIG.7, the sensor120may include a connect member48. The connect member48is fixed to the first face50a. The fixed portion10F is provided around the connect member48. Electrical connections may be made via the connect member48. In this example, the connect member48includes a first connect member48aand a second connect member48b. The connect member48(for example, the first connect member48aand the second connect member48b) may be electrically insulated from the fixed portion10F and the movable portion10M. At least a part of the connect member48(for example, the first connect member48aand the second connect member48b, etc.) may be electrically connected to the fixed portion10F or the movable portion10M by wiring for electrical connection.

Second Embodiment

A second embodiment relates to an electronic device.

FIG.8is a schematic diagram illustrating an electronic device according to a second embodiment.

As shown inFIG.8, an electronic device310according to the embodiment includes the sensors according to the first to third embodiments and the circuit processor170. In the example ofFIG.8, the sensor110is drawn as the sensor. The circuit processor170is configured to control a circuit180based on the signal S1obtained from the sensor. The circuit180is, for example, a control circuit for a drive device185. According to the embodiment, for example, the circuit180for controlling the drive device185can be controlled with high accuracy.

As shown inFIG.8, the sensor system210according to the embodiment includes the sensor (for example, the sensor110) according to the first embodiment and a detection target member81. The sensor110is fixed to the detection target member81. The sensor110can detect a signal from the detection target member81.

FIGS.9A to9Hare schematic views illustrating applications of the electronic device according to the embodiment.

As shown inFIG.9A, the electronic device310may be at least a portion of a robot. As shown inFIG.9B, the electronic device310may be at least a portion of a machining robot provided in a manufacturing plant, etc. As shown inFIG.9C, the electronic device310may be at least a portion of an automatic guided vehicle inside a plant, etc. As shown inFIG.9D, the electronic device310may be at least a portion of a drone (an unmanned aircraft). As shown inFIG.9E, the electronic device310may be at least a portion of an airplane. As shown in FIG.

9F, the electronic device310may be at least a portion of a ship. As shown inFIG.9G, the electronic device310may be at least a portion of a submarine. As shown inFIG.9H, the electronic device310may be at least a portion of an automobile. The electronic device310may include, for example, at least one of a robot or a moving body.

FIGS.10A and10Bare schematic views illustrating applications of the sensor according to the embodiment.

As shown inFIG.10A, a sensor430according to the fifth embodiment includes the sensor according to one of the first to third embodiments, and a transmission/reception part420. In the example ofFIG.10A, the sensor110is illustrated as the sensor. The transmission/reception part420is configured to transmit the signal obtained from the sensor110by, for example, at least one of wireless and wired methods. The sensor430is provided on, for example, a slope surface410such as a road400. The sensor430can monitor the state of, for example, a facility (e.g., infrastructure). The sensor430may be, for example, a state monitoring device.

For example, the sensor430detects a change in the state of a slope surface410of a road400with high accuracy. The change in the state of the slope surface410includes, for example, at least one of a change in the inclination angle and a change in the vibration state. The signal (inspection result) obtained from the sensor110is transmitted by the transmission/reception part420. The status of a facility (e.g., infrastructure) can be monitored, for example, continuously.

As shown inFIG.10B, the sensor430is provided, for example, in a portion of a bridge460. The bridge460is provided above the river470. For example, the bridge460includes at least one of a main girder450and a pier440. The sensor430is provided on at least one of the main girder450and the pier440. For example, at least one of the angles of the main girder450and the pier440may change due to deterioration or the like. For example, the vibration state may change in at least one of the main girder450and the pier440. The sensor430detects these changes with high accuracy. The detection result can be transmitted to an arbitrary place by the transmission/reception part420. Abnormalities can be detected effectively.

The embodiments may include the following Technical proposals:

Technical Proposal 1

A sensor, comprising:a base including a first face;a fixed portion fixed to the first face; anda movable portion supported by the fixed portion,a first gap being provided between the first face and the movable portion,the movable portion including a plurality of annular portions, a plurality of connect portions, and a first structure,each of the plurality of annular portions being provided around the fixed portion with the fixed portion as a center in a first plane along the first face,the plurality of connect portions extending along a radial direction,the radial direction passing through the first center of the fixed portion in the first plane and being along the first plane,one of the plurality of connect portions connecting two of the plurality of annular portions to each other,the plurality of annular portions including a first annular portion,the first annular portion being outermost of the plurality of annular portions,the first structure being connected to the first annular portion,the first annular portion being provided between the fixed portion and the first structure, anda first structure length of the first structure in the radial direction being longer than a first annular portion length of the first annular portion in the radial direction.

Technical Proposal 2

The sensor according to Technical proposal 1, whereinthe plurality of annular portions include a second annular portion,the second annular portion is provided between the fixed portion and the first annular portion,the second annular portion is closest to the first annular portion among the plurality of annular portions, andthe first structure length is longer than a first distance in the radial direction between the second annular portion and the first annular portion.

Technical Proposal 3

The sensor according to Technical proposal 1 or 2, whereinthe first structure includes a first structure component and a first structure connect portion,the first structure connect portion is provided between the first annular portion and the first structure component, and connects the first structure component to the first annular portion, andfirst structure connect portion length of the first structure connect portion in a circumferential direction centered on the fixed portion along the first face is shorter than a first structure component length of the first structure component in the circumferential direction.

Technical Proposal 4

The sensor according to Technical proposal 3, whereinthe first structure further includes a second structure connect portion,the second structure connect portion is provided between the first annular portion and the first structure component, and connects the first structure component to the first annular portion,a direction from the first structure connect portion to the second structure connect portion is along the circumferential direction, anda second structure connect portion length of the second structure connect portion in the circumferential direction is shorter than the first structure component length.

Technical Proposal 5

The sensor according to Technical proposal 2, further comprising:a first fixed electrode fixed to the first face, andthe first fixed electrode being provided between the second annular portion and the first annular portion.

Technical Proposal 6

The sensor according to Technical proposal 5, further comprising:a controller configured to apply an electrical signal between the fixed portion and the first fixed electrode.

Technical Proposal 7

The sensor according to Technical proposal 2, whereinthe movable potion includes a plurality of the first structures,the plurality of first structures are provided around the first annular portion in the first plane, andthe plurality of first structures are arranged along a circumferential direction centered on the fixed portion in the first plane.

Technical Proposal 8

The sensor according to Technical proposal 7, further comprising:a plurality of first fixed electrodes fixed to the first face,the plurality of first fixed electrodes being provided between the second annular portion and the first annular portion,the plurality of first fixed electrodes being arranged along the circumferential direction, anda first structure number of the plurality of first structures being greater than a first fixed electrode number of the plurality of first fixed electrodes.

Technical Proposal 9

The sensor according to Technical proposal 8, whereinthe first fixed electrode number is 8 or more.

Technical Proposal 10

The sensor according to Technical proposal 9, whereinthe first structure number is an integral multiple of 2 or more of the first fixed electrode number.

Technical Proposal 11

A sensor, comprising:a base including a first face;a fixed portion fixed to the first face; anda movable portion supported by the fixed portion,a first gap being provided between the first face and the movable portion,the movable portion including a plurality of annular portions, a plurality of connect portions, and a plurality of first structures,each of the plurality of annular portions being provided around the fixed portion with the fixed portion as a center in a first plane along the first face,the plurality of connect portions extending along a radial direction,the radial direction passing through a first center of the fixed portion in the first plane and being along the first plane,one of the plurality of connect portions connecting two of the plurality of annular portion to each other,the plurality of annular portions including a first annular portion,the first annular portion being outermost of the plurality of annular portions,the plurality of first structures being connected to the first annular portion,the first annular portion being provided between the fixed portion and the plurality of first structures,the plurality of first structures and the first annular portionsatisfying at least one of a first condition, a second condition, or a third condition,in the first condition, a first sum of areas of each of the plurality of first structures in the first plane being larger than a first annular portion area of the first annular portion in the first plane,in the second condition, a second sum of volumes of each of the plurality of first structures being larger than a first annular portion volume of the first annular portion, andin the third condition, a third sum of the masses of each of the plurality of first structures being greater than a first annular portion mass of the first annular portion.

Technical Proposal 12

The sensor according to Technical proposal 11, whereinthe first structure includes a first structure component and a first structure connect portion,the first structure connect portion is provided between the first annular portion and the first structure component, andconnects the first structure component to the first annular portion, anda first structure connect portion length of the first structure connect portion in a circumferential direction centered on the fixed portion along the first plane is shorter than a first structure component length of the first structure component in the circumferential direction.

Technical Proposal 13

The sensor according to Technical proposal 12, whereinthe first structure further includes a second structure connect portion,the second structure connect portion is provided between the first annular portion and the first structure component, and connects the first structure component to the first annular portion,a direction from the first structure connect portion to the second structure connect portion is along the circumferential direction, anda second structure connect portion length of the second structure connection portion in the circumferential direction is shorter than the first structure component length.

Technical Proposal 14

The sensor according to Technical proposal 12 or 13, further comprising:a first fixed electrode fixed to the first face,the plurality of annular portions including a second annular portion,the second annular portion being provided between the fixed portion and the first annular portion,the second annular portion being closest to the first annular portion among the plurality of annular portion, andthe first fixed electrode being provided between the second annular portion and the first annular portion.

Technical Proposal 15

The sensor according to Technical proposal 14, further comprising:a controller configured to apply an electrical signal between the fixed portion and the first fixed electrode.

Technical Proposal 16

The sensor according to Technical proposal 14 or 15, whereinthe plurality of connect portion includes a first connect portion,the first connect portion is provided between the second annular portion and the first annular portion,the first connect portion connects the second annular portion and the first annular portion to each other,the movable portion further includes a second structure, the second structure is provided between the second annular portion and the first annular portion,the second structure is connected to the first connect portion, anda direction from the first fixed electrode to the second structure is along the circumferential direction.

Technical Proposal 17

A sensor, comprising:a base including a first face;a fixed portion fixed to the first face; anda movable portion supported by the fixed portion,a first gap being provided between the first face and the movable portion,the movable portion including a plurality of annular portions, a plurality of connect portions, and a plurality of first structures,each of the plurality of annular portions being provided around the fixed portion with the fixed portion as a center on a first plane along the first face,the plurality of connect portions extending along a radial direction,the radial direction passing through a first center of the fixed portion in the first plane and being along the first plane,one of the plurality of connect portions connecting two of the plurality of annular portions to each other,the plurality of annular portions including a first annular portion,the first structure being connected to the first annular portion,a first structure length of the first structure in the radial direction being longer than a first annular portion length of the first annular portion in the radial direction,the first structure including a first structure component, a first structure connect portion, and a second structure connect portion,the first structure connect portion being provided between the first annular portion and the first structure component, andconnecting the first structure component to the first annular portion,the second structure connect portion being provided between the first annular portion and the first structure component, and connecting the first structure component to the first annular portion, anda direction from the first structure connect portion to the second structure connect portion being along a circumferential direction centered on the fixed portion along the first plane.

Technical Proposal 18

The sensor according to Technical proposal 17, whereina first structure connect portion length of the first structure connect portion in the circumferential direction is shorter than a first structure component length of the first structure component in the circumferential direction, anda second structure connect portion length of the second structure connect portion in the circumferential direction is shorter than the first structure component length.

Technical Proposal 19

A sensor system, comprising:the sensor according to any one of Technical proposals 1-18; anda detection target member, the sensor being fixed to the detection target member.

Technical Proposal 20

An electronic device, comprising:the sensor according to any one of Technical proposals 1-18; anda circuit controller configured to control a circuit based on a signal obtained from the sensor.

According to the embodiment, a sensor, a sensor system, and an electronic device whose characteristics can be improved can be provided.

Hereinabove, exemplary embodiments of the invention are described with reference to specific examples. However, the embodiments of the invention are not limited to these specific examples. For example, one skilled in the art may similarly practice the invention by appropriately selecting specific configurations of components included in the sensor such as members, substrates, sensor sections, housings, sensor elements, bases, fixed portions, movable portions, controllers, etc., from known art. Such practice is included in the scope of the invention to the extent that similar effects thereto are obtained.

Moreover, all sensors, all sensor systems, and all electronic devices practicable by an appropriate design modification by one skilled in the art based on the sensors, the sensor systems, and the electronic devices described above as embodiments of the invention also are within the scope of the invention to the extent that the purport of the invention is included.