Hosiden Corporation

Yasuo Sugimori

Akira Yamamoto

Shinichi Saeki

Mamoru Yasuda

Takahisa Ohtsuji

Yasuhiro Shigeno

Naoki Toyoda

A substrate having a metal capsule which has an open end caulked to a planar periphery portion and in which an electric apparatus is accommodated includes a substrate main body having a planar central projecting portion consisting of a resin material and a step provided on a side of the flat plate portion located opposite a mounted surface side, an annular metal member which is located between a peripheral part of the central projecting portion and a flat plate portion and which is partly exposed toward the mounted surface side like a flange, a plurality of external terminals provided on the mounted surface of the central projecting portion, a metal coat connected to the annular metal member and to at least one of the external terminals and formed along an outer surface of the central projecting portion, a plurality of internal terminals provided on an inner surface of the substrate main body located opposite the mounted surface side, ground through-holes formed in a planar peripheral portion at a position where the annular metal member is sandwiched, the ground through-holes connecting some of the internal terminals to the annular metal member, and signal through-holes formed in the substrate main body and connecting the other internal terminals to the external terminals.

Condenser microphone and method of manufacturing substrate therefor

A vibration sensor capable of preventing a diaphragm electrode from being damaged without lowering sensitivity as well as realizing a satisfactory assembling process. The vibration sensor includes a fixed electrode, and a diaphragm electrodehaving a weight memberattached to a membrane surface facing away from the fixed electrodeand fixedly supported at peripheries thereof, the vibration sensor being capable of outputting variation of capacitance between the fixed electrode and the diaphragm electrode as vibration signals. The vibration sensor further includes projecting portionsformed on parts of an end portion of the weight memberto project along the direction of the membrane surface and spaced from the membrane surface of the diaphragm electrode, and a restricting memberfor contacting the projecting portionsof the weight memberdisplaced along the direction of the membrane surface of the diaphragm electrode, thereby to restrict displacement of the weight member

Vibration sensor

An electret-condenser microphone according to the present invention includes a vibrating diaphragm and a back electrode which compose a condenser; a cylindrical case which houses the vibrating diaphragm and the back electrode; a circuit board which is housed in an opening of the cylindrical case, is fixed to the opening by crimping a crimp edge formed by bending an opening end of the cylindrical case inward, and covers the opening; and a substrate fastened to an outer surface of the circuit board. A circular pattern and annular pattern are formed on the outer surface of the circuit board and a circular pattern and annular pattern are formed on that surface of the substrate which is farther from the circuit board. The circular pattern and annular pattern are connected with the circular pattern and annular pattern via thru-holes in the substrate, and that surface of the substrate on which and are formed serves as a reflow-soldering surface.

Electret-condenser microphone

A substrate is obtained as follows. A structure is formed using a metal plate for a lead frame on which terminals and connection portions are formed; the terminals are exposed from either a front or back surface and the connection portions connect the terminals together. A resin is then used to make the structure hard. The height of a step in a central step portion is variable. The resin is one of PA6T, PPS, and LCP, all of which are resistant to heat. A step portion can be obtained which projects from a bottom surface of a circuit substrate. The circuit substrate is inexpensively obtained.

Condenser microphone and method for manufacturing substrate for the same

A three-axis acceleration sensor having a simple construction is provided for improving shock resistance without lowering sensor sensitivity. An acceleration sensor for detecting acceleration in three orthogonal directions comprises an electrode substrate pair including electrode substrates () opposed to each other, and each having fixed electrodes () corresponding to three axes, respectively, a diaphragm () acting as a movable electrode, and an umbrella-like weight () mounted centrally of the diaphragm (). Acceleration is detected based on variations in capacitance between the fixed electrodes () and diaphragm (). Each electrode substrate () has an electret layer () formed to cover surfaces of the fixed electrodes (). At least one of the electrode substrates defines, centrally thereof, a through hole (). A shaft portion of the umbrella-like weight () extends through the through hole () from outside, and is connected to the diaphragm ().

Growing community of inventors

Nabari, Japan

Yasuo Sugimori