Abstract:
A flexure transducer element used in an acceleration sensor for sensing an acceleration applied thereto and the method of making the same. The flexure transducer element comprises a frame, a sheet member, a weight, and a support member.
Abstract:
An angular rate sensor provides a digital delta theta output signal. A drive member is formed of a single, silicon wafer having a pair of oppositely-facing planar surfaces. The drive member includes a frame and a drive member central portion connected to the frame and arranged to have rotational compliance between the frame and the central portion about an axis perpendicular to the planar surfaces of the silicon wafer. Drive signals are applied to a plurality of electrodes on the central portion to cause rotational oscillation of the drive member central portion about a drive axis perpendicular to the planar surfaces of the silicon wafer. A silicon sensing member is connected to the drive member. The sensing member has a central support member connected to the drive member central portion such that rotational oscillations of the drive member central portion are transmitted to the sensing member central portion. A sensing portion is connected to the sensing member central support member to allow the sensing portion to oscillate about the drive axis and to allow an input rotation rate about an axis perpendicular to the drive axis to produce out-of-plane oscillations of the sensing portions. Signal processing apparatus is connected to the sensing portion for producing a signal indicative of the input rotational rate as a function of the amplitude of the out-of-plane oscillations of the sensing portion.
Abstract:
When embodied in a microgyroscope, the invention is comprised of a silicon, four-leaf clover structure with a post attached to the center. The whole structure is suspended by four silicon cantilevers or springs. The device is electrostatically actuated and capacitively detects Coriolis induced motions of the leaves of the leaf clover structure. In the case where the post is not symmetric with the plane of the clover leaves, the device can is usable as an accelerometer. If the post is provided in the shape of a dumb bell or an asymmetric post, the center of gravity is moved out of the plane of clover leaf structure and a hybrid device is provided. When the clover leaf structure is used without a center mass, it performs as a high Q resonator usable as a sensor of any physical phenomena which can be coupled to the resonant performance.
Abstract:
A three-dimensional acceleration sensor capable of detecting a small acceleration value and even an acceleration value amounting up to 100G occurring in the event of a collision comprises a diaphragm for linking a frame and a massive part and diaphragms and beams for linking the massive part and a central part. These elements are formed by working a single crystalline silicon plate. Gaps between the massive part and opposing electrodes are changed by acceleration applied to the massive part. A circuit connected to terminals detects the changes in gaps as changes in capacitances and determines direction and level of the applied acceleration.
Abstract:
A resonant bridge two-axis microaccelerometer is disclosed comprising polysilicon resonant bridges orthogonally attached to a silicon proof mass, such that the silicon proof mass is suspended by the resonant bridges. Acceleration in the plane of the substrate causes differential axial loads on the opposing microbridges in each pair, thereby shifting their resonant frequencies. The acceleration component aligned with a pair is measured by the difference in resonant frequencies.
Abstract:
A resonant bridge microaccelerometer is formed using patterned Silicon-on-Insulator (SOI) material. A buried layer is formed in the silicon substrate using preferably oxygen ion implanting techniques. A predetermined proof mass is subsequently formed by selective deposition of an appropriate material on an epitaxially grown layer of silicon generally over the buried layer. The buried layer is subsequently removed by a hydrofluoric acid etch, thereby forming a gap generally everywhere therebetween the proof mass and the supporting silicon substrate, and delineating the resonant microbridges within the microaccelerometer.
Abstract:
There are provided a multi-axis sensor and a method for manufacturing the same. The multi-axis sensor includes: a first sensor mounted on a board and detecting inertial force; and a second sensor mounted on the board and detecting a position and a motion, wherein the first sensor and the board have a seal formed therebetween so as to prevent permeation from the outside and are electrically connected to each other.
Abstract:
A silicon wafer includes a plurality of chip patterns arranged parallel to a first direction and a second direction intersecting the first direction, wherein the plurality of chip patterns include one or more patterns arranged in the first direction and the second direction in a straight line, the plurality of chip patterns include a first chip pattern and a second chip pattern adjacent to the first chip pattern, and the second chip pattern is arranged by rotating the first chip pattern at 90 degrees, the plurality of chip patterns are arranged so that an axis in which a cleavage plane of the silicon wafer and a surface arranged with the pattern on the silicon wafer intersect, and the first direction are different, and an angle between the axis and the first direction of the second chip pattern is 90 degrees.
Abstract:
There is provided a MEMS sensor including: a mass body; a support part floatably supporting the mass body; and a flexible beam having one end connected to the mass body and the other end connected to the support part. At least one end of the flexible beam connected to the mass body or the support part includes a curved portion to maximize an effective length supporting a load.
Abstract:
Disclosed herein is an acceleration sensor including: a mass body part; a flexible beam having an electrode or a piezoresistor disposed thereon and having the mass body part coupled thereto; and a support part having the flexible beam connected thereto and supporting the flexible beam, wherein the mass body part, the flexible beam, and the support part are formed by coupling first and second substrates to each other, one surface of the first substrate is provided with a first masking pattern corresponding to the flexible beam, the mass body part, and the support part, and one surface of the second substrate is provided with a second masking pattern corresponding to the mass body part and the support part.