Mitsumi Electric Co., Ltd.

A MEMS device, including: a MEMS element (2, 4) that has a space surrounded by an outer peripheral frame from four directions, has a thin film closing the space from an upper surface of the outer peripheral frame, and has an electrode pad (P1 to P4) for wire bonding on the outer peripheral frame; a mount (213) on which the MEMS element is mounted; and a plurality of adhesive areas (241 to 244) that bonds the MEMS element to the mount and are arranged on a plane of the mount. At least one of the plurality of adhesive areas is arranged at a position corresponding to the electrode pad in the plane.

A protective cover (20) is for covering an optical gas sensor (10). The gas sensor includes: a casing body (11) that has a hollow part (13) into which a gas is introduced and a gas intake port (111, 112) that communicates with the hollow part; and a light source (2) and a light receiver (4) disposed to face each other with the hollow part in-between. The gas sensor is mounted on a board (6) and detects a gas concentration inside the hollow part, based on a detection signal of the light receiver that receives light emitted by the light source. The protective cover is box-shaped and has a wall. One side of the box-shaped protective cover is open. At least part of the wall has an opening (21A) provided with a filter (23). At an open edge of the one side, the protective cover has at least a pair of fitting pieces (22) to be fitted to fitting portions (6a) of the board.

Disclosed is a stabilized power supply apparatus including: a switching power supply apparatus (20); and a current stabilizing circuit (10) connected at a stage before or after the switching power supply apparatus. The stabilized power supply apparatus converts a DC input voltage supplied from a DC power supply and outputs a stable DC voltage, and the current stabilizing circuit includes: a current control transistor (M1) connected in series between an input terminal and an output terminal; a low-pass filter (LPF) connected to the output terminal; an operational amplifier circuit (AMP) that controls the current control transistor according to a potential difference between a feedback voltage of an output returned through the low-pass filter and a predetermined voltage; and an amplitude limiting circuit (D1, D2) that limits an amplitude range of the feedback voltage.

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