Asahi Kasei Microdevices Corporation

Yuji Goda

Yuta Takagi

Yoshihiko Koizumi

Maksym Bryzgalov

Henrik Rodjegard

A change rate of in-vehicle carbon dioxide concentration at an optional time point when the vehicle is in a parked state is estimated on the basis of detection signals of a COconcentration sensor at two different time points when in the parked state; and on the basis of a detection signal of the COconcentration sensor at the optional time point, a preset time constant of concentration change of the in-vehicle carbon dioxide concentration, and the estimated change rate, the in-vehicle carbon dioxide concentration at a time point when a predetermined time according to the time constant has elapsed since the optional time point is estimated (steps Sto S). A detection target organism is determined to be present in the vehicle when the estimated in-vehicle carbon dioxide concentration is equal to or more than a threshold value set according to the detection target organism (steps Sand S).

In-vehicle abnormality detection device and in-vehicle abnormality detection method

A gas sensor module () includes an infrared light emitting diode () configured to emit infrared light in accordance with a drive current, a quantum infrared sensor () configured to detect infrared light that passes through a detection target gas, a drive circuit () configured to output the drive current to the infrared light emitting diode (), a charging circuit () to be connected to a power source and configured to output a charge current having a smaller current amount than the drive current, and a capacitor () configured to charge by the charge current being supplied from the charging circuit () and discharge by supplying the drive current to the drive circuit ().

Gas sensor module

An optical concentration measuring device capable of power saving and lifespan extension of a light source is provided, including a light source emitting an amount of light corresponding to a supplied power; a light detection part receiving at least a part of the light emitted by the light source and generating a signal corresponding an amount of received light as an output signal; a smoothing filter smoothing a signal based on the output signal; a signal change amount calculation part calculating a first and a second change amounts corresponding to a change amount between at least two selected acquisition values selected from acquisition values based on the output signal at current or past time; a light source control part controlling the power supplied to the light source based on the first change amount; and a filter control part controlling characteristics of the smoothing filter based on the second change amount.

Optical concentration measuring device and control method for optical concentration measuring device

A light-emitting/receiving device including: a diode-type light-emitting element formed on a semiconductor substrate; a diode-type light-receiving element formed on the semiconductor substrate; a light source driving unit configured to supply a first common voltage to an anode or a cathode of the light-emitting element to drive the light-emitting element; and a light signal processing unit configured to perform current/voltage conversion on an output current outputted from the light-receiving element, by referring to a second common voltage.

Light-emitting/receiving device and light-detecting method

Alight receiving device is equipped with a first light receiving element which outputs a first output signal corresponding to an amount of received light, a temperature information acquisition unit which acquires temperature information of the first light receiving element, a generation unit which generates compensating information of the first output signal, based on first output signals and temperature information when power is supplied to the first light receiving element in a plurality of power supply conditions and stores the same in a storage unit, and a compensation unit which compensates the first output signal, based on the temperature information and the compensating information when the first output signal is output. Thus, even when temperature characteristics of an optical element are varied, the temperature characteristics are compensated highly accurately.

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Tokyo, Japan

Yuji Goda