Seiko Epson Corporation

Seiko Instruments Inc

Tsukasa Kosuda

Motomu Hayakawa

Ichiro Aoshima

Norimitsu Baba

Katsuyuki Honda

Chiaki Nakamura

Hajime Kurihara

Masao Kuroda

Takashi Ogiue

Hiroshi Odagiri

Atsushi Matsuo

Makoto Zakoji

Koji Kitazawa

Michio Kobayashi

Yutaka Kondo

Naokatsu Nosaka

Yutaka Kawafune

A light receiving element includes a silicon substrate, a photodiode, an amplifier circuit adapted to amplify an output signal from the photodiode, and a light blocking section adapted to cover at least a part of the amplifier circuit to block light, and the photodiode, the amplifier circuit and the light blocking section are provided to the silicon substrate.

Light receiving element having light blocking section covering at least part of amplifier circuit, light receiving module , photoelectric sensor and biological information measurement

A biometric information processing device includes a heart rate detection unit, a relative heart rate calculation unit, a relative oxygen intake calculation unit, an oxygen intake estimation unit and a calorie expenditure calculation unit. The relative heart rate calculation unit calculates a relative heart rate obtained from a first difference over a second difference, the first difference being by subtracting a resting heart rate of the subject from the heart rate, the second difference being by subtracting the resting heart rate from a maximum heart rate. The relative oxygen intake calculation unit calculates a relative oxygen intake based on the relative heart rate. The oxygen intake estimation unit estimates the oxygen intake from the relative oxygen intake. The calorie expenditure calculation unit calculates calorie expenditure based on the oxygen intake.

Biometric information processing device, biometric information processing method, and control program

A biometric information processing device has a heart rate detection unit that detects the heart rate of a subject; a relative heart rate calculation unit that calculates a relative heart rate, which is the relative value of the heart rate to the prescribed resting heart rate of the subject; a relative oxygen intake calculation unit that calculates a relative oxygen intake based on the relative heart rate; an oxygen intake estimation unit that estimates the oxygen intake from the relative oxygen intake; and a calorie expenditure calculation unit that calculates calorie expenditure based on the oxygen intake.

The present invention realizes calculating a pulse rate accurately, even when a body movement component has no periodical characteristics, by surely removing the body movement component generated in a living organism from a pulse wave component. A pulse wave detecting section includes a pulse wave sensor and outputs a pulse wave detection signal to an MPU functioning as a body motion component removing section. A body motion sensor outputs a body motion detection signal corresponding to a body motion that affects the behavior of venous blood to the MPU. As a result, to the MPU removes the body motion component from the pulse wave detection signal based on the body motion detection signal. A pulse rate calculating section calculates the pulse rate based on the pulse wave detection signal from which the body motion component has been removed. The pulse rate is displayed on a liquid crystal display device.

Pulse meter, method for controlling pulse meter, wristwatch-type information device, control program, storage medium, blood vessel simulation sensor, and living organism information measurement device

An electronic watch in which the display on a liquid crystal displayis prohibited when the detected output voltage of a secondary batterydrops to a first predefined voltage. An initialization process is performed when the detected voltage of the secondary batterydrops to a second voltage lower than the first voltage, and the display on the liquid crystal display unitis restarted when the detected voltage of the secondary batteryrises to a third voltage not lower than the first voltage after having reached the second voltage.

Electronic apparatus and method of controlling the electronic apparatus

A frequency analyzer carries out a frequency analysis on a pulse wave signal output from a pulse wave detector. A candidate extractor extracts candidate spectrum peaks from a frequency analysis result of the frequency analyzer. A phase variation calculator calculates variations in phase angle of each of the extracted candidate spectrum peaks, and a spectrum peak selector selects a target spectrum peak from among the extracted candidate spectrum peaks based on their respective variations in phase angle. A pulse rate is calculated using the target spectrum peak.

Pulsimeter, control method for pulsimeter, wristwatch information device, control program, and recording medium

By using a CR oscillating circuit and a PLL oscillating circuit selectively, these two oscillating circuits are used as a high frequency, low power consumption, short waiting time for stable oscillation, and low operating voltage oscillating circuit.

Apparatus for selecting and outputting either a first clock signal or a second clock signal

A voltage and internal resistance of a battery are measured in advance as its capacity decreases. In a flash memory of a device powered by the battery, voltages necessary to drive a motor, an EL display, and a bezel input unit are stored. By comparing the voltage of the battery with a resistor connected as a dummy load and the voltage read from the flash memory, it can be determined whether it is possible to drive the motor, the EL display, or the bezel input unit.

Electronic apparatus having battery power source and control method for the electronic apparatus

In an electronic device in which a charge path to a secondary battery and a signal path to a reception device are partially shared and a receiving-time current due to the reception is made to be a charging current for the secondary battery, even in a case in which the voltage across the secondary battery is close to a maximum voltage, by bypassing the charging current due to the signal reception, the voltage across the secondary battery is controlled so as not to exceed the maximum voltage.

Electronic device and control method for the same

A first circuit having a first coil electrically charges a second circuit having a second coil through electromagnetic coupling of the two coils. When data signals are to be transferred between the first and second circuits, signal transfer is started only after the second circuit has been charged for a predetermined period of time. The position relationship between the coils is also detected, and a charging/transfer selector changes a duty ratio between charge transfer and data transfer in accordance with the detected result. The charge is transferred in an intermittent manner, and the charging rate is adjusted according to the difference between the voltage of a secondary battery observed during a charging phase and the voltage of the secondary battery observed a certain time after interruption of the charging phase, or vice versa.

Electronic device, control method for electronic device, recharge-rate estimating method for secondary battery, and charging control method for secondary battery

An electronic unit for charging a unit to be charged having an accumulator section which can be repeatedly charged has a charging section for charging the accumulator section according to a charging control signal and a charging control section. The charging control section monitors a battery voltage (or a charging current), and maintains an effective charging period per unit time for a long term when the battery voltage (or the charging current) of an accumulator battery is lower than a limit voltage (or the charging current corresponding to the limit voltage) selected in advance. After the battery voltage (or the charging current) reaches the limit voltage (or the charging current corresponding to the limit voltage), however, the charging control section reduces the effective charging period per unit time.

Electronic device, electronic device to be charged and method of controlling electronic devices

When emitted light from LED,is incident on photodiodes,and,with luminance Pa and Pb, currents ia and ib are generated according to luminance Pa and Pb. When outside light is incident through the finger tissues on photodiodes,and,with luminance Pc, current ic is produced. The current i,(&equals;ia&plus;ic) generated by photodiode,and the current i,(&equals;&minus;ib&minus;ic) generated by photodiode,are added at node X, and the current ic corresponding to outside light is thus cancelled. In addition, photodiodes,and,are disposed at different distances from LED,As a result, the current flowing to opamp,is current ia corresponding to luminance Pa because luminance Pb is extremely low. The opamp,then applies a current voltage conversion to generate pulse wave signal Vm.

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Matsumoto, Japan

Tsukasa Kosuda