SEIKO INSTRUMENTS INC.

A biological information detection device includes a main body portion, a heartbeat detection portion, formed integrally with the main body portion, which has electrodes that come into contact with a biological surface, and a fixing band, detachably provided to the main body portion, which mounts the main body portion and the heartbeat detection portion to a user. A sealing portion for securing sealing of an electrical connection portion is provided in the periphery of the electrical connection portion that electrically connects the main body portion to the electrodes of the heartbeat detection portion.

A biological information detection device has a main body portion, a biological signal detection portion formed integrally with the main body portion, a mounting portion for detachably mounting the main body portion and the biological signal detection portion to a human body, and an engagement portion for detachably mounting the main body portion to the mounting portion. The biological signal detection portion has electrodes configured to be brought into contact with a biological surface of the human body. The engagement portion includes first connecting members protruding from respective opposite sides of the main body portions at positions corresponding to the electrodes, and second connecting members extending from respective end portions of the mounting portion for detachable engagement with the respective first connecting members.

Provided is a readout circuit for a non-volatile memory device, which has a large readout margin for distinguishing between 0 and 1 of data and has a small circuit area. A voltage output from a single bias circuit is applied to a gate of a memory element and a gate of an NMOS transistor serving as a reference current source to be compared with a current flowing through the memory element. Thus, the gates are controlled by the same voltage, and hence characteristics fluctuations in the operating temperature range and the operating power supply voltage range are reduced. Therefore, a large readout margin for distinguishing 0 and 1 of data can be obtained, resulting in a simplified circuit configuration.

An electrochemical cell of improved anti-leak property is provided. A silver oxide battery includes: a positive electrode canister having a form of a cylinder with a bottom portion; a negative electrode canister having a form of a cylinder with a lid portion and being contained in the positive electrode canister; and an electrolytic solution contained within a space formed by the positive electrode canister and the negative electrode canister. The negative electrode canister is formed into a shape of a double-step cylinder having decreasing inner diameters toward the lid portion. The double-step cylinder has a first cylindrical portion that defines a cylindrical portion closer to the lid portion, and a second cylindrical portion that defines a cylindrical portion farther from the lid portion. The first cylindrical portion has a first inner curved surface that projects out at a first apex. The second cylindrical portion has a second inner curved surface that projects out at a second apex. The angle made by the bottom portion and the straight line connecting the first apex and the second apex to each other ranges from 15° to 45°.

Provision of a portable device capable of improving waterproof property in a push-in operation portion with a simple structure. A wrist watch (portable device) 11 includes an outer case (device outer housing) 12, an operation member 41 and a holding ring 46. The outer case 12 includes a holding portion 35 in which an annular bearing surface 35 a is formed. The operation member 41 is made of a soft material having waterproof performance. The operation member 41 includes an annular packing portion 42 to be seated on the bearing surface 35 a and a push-in portion 43 integrally connected to the portion, to which push-in operation is performed from the outside of the device outer housing 12.

Provision of a waterproof device capable of improving waterproof property in a push-in operation portion formed by including an extensible member, a holding member and an operation shaft. A wrist watch (portable device) 11 includes an outer case (device outer housing) 12 , an extensible member 32 with waterproof property, a holding member 41 attached to the case 12 and an operation shaft 51 . The case 12 includes a seating portion 29 and a hole 30 . The extensible member 32 includes a cylindrical portion 33 which can be extended/retracted in an axial direction, closing one end as well as opening the other end, and inserted into the hole 30 , and a flange 35 projecting integrally from an outer periphery of the other end portion of the cylindrical portion and seated on the seating portion 29 . The holding member 41 includes a presser portion 42 sandwiching the flange 35 with the seating portion 29 to thereby secure the waterproofing around the flange, and a through hole 44 connecting to the opening of the cylindrical portion 33 . The operation shaft 51 includes a shaft end portion 52 protruding to the outside of the holding member 41 through the through hole 44 . The operation shaft 51 is inserted into the cylindrical portion 33 and arranged in a state of being able to be pushed from the outside of the case 12 so as to allow the cylindrical portion 33 to extend.

There is provided a level shift circuit free from malfunction. The level shift circuit converts a signal of a first power supply voltage of a first supply terminal, which is supplied to an input terminal, into a signal of a second power supply voltage of a second supply terminal and outputs the converted signal to an output terminal. The level shift circuit has a control circuit that detects when the first power supply voltage reduces below a predetermined voltage. The voltage of the output terminal of the level shift circuit is fixed to the second power supply voltage or a ground voltage according to a detection signal of the control circuit.

There is provided a battery voltage detector circuit which uses a multiplexer system and which is capable of reducing the influence of the deviation of a detected voltage attributable to a parasitic capacitance, thus improving the accuracy of voltage detection. The battery voltage detector circuit that monitors the voltages of a plurality of batteries connected in series includes a flying capacitor, a multiplexer switch that sequentially connects the flying capacitor to the plurality of batteries, a voltage detecting unit that detects the voltage of the flying capacitor, a first reference potential detecting unit connected to one terminal of the flying capacitor, a second reference potential connecting unit connected to the other terminal of the flying capacitor, and a control circuit that controls the multiplexer switch, the first reference potential connecting unit and the second reference potential connecting unit.

Provided is a magnetic sensor device capable of performing signal processing at high speed with high accuracy. The magnetic sensor device includes: a plurality of Hall elements; a plurality of differential amplifiers to which the plurality of Hall elements are connected, respectively; a detection voltage setting circuit for outputting a reference voltage; and a comparator including: a plurality of differential input pairs connected to the plurality of differential amplifiers, respectively; and a differential input pair connected to the detection voltage setting circuit.

Provided is a magnetic sensor device capable of performing signal processing at high speed with high accuracy. The magnetic sensor device includes: a plurality of Hall elements; a plurality of differential amplifiers to which the plurality of Hall elements are connected, respectively; a detection voltage setting circuit for outputting a reference voltage; and a comparator including: a plurality of differential input pairs connected to the plurality of differential amplifiers, respectively; and a differential input pair connected to the detection voltage setting circuit.