Alpine Electronics, Inc.

Alps Alpine Co., Ltd.

Teiichi Ichikawa

Shohei Yoshida

A proximity detection device according to the present invention includes: a plurality of light emitting elements; a plurality of light receiving elements; a drive circuit configured to sequentially drive the plurality of light emitting elements; a measurement circuit configured to measure a light reception signal of a corresponding light receiving element when the plurality of light emitting elements are sequentially driven; and a control unit configured to i) control a drive current of a light emitting element such that a light emission amount of the light emitting element is suppressed, and ii) amplify a detection signal of a light receiving element to compensate for the suppressed light emission amount during measurement with a relatively short distance between the light emitting element and the light receiving element.

Proximity detection device and method for detecting proximity

Four infrared LEDs and two photodiodes PD are arranged below a lower side of a display surface in the order of an LED, a PD, an LED, an LED, a PD, and an LED. A detection signal Aof the PDwhen the LEDemits light, a detection signal Aof the PDwhen the LEDemits light, a detection signal Aof the PDwhen the LEDemits light, and a detection signal Aof the PDwhen the LEDemits light are used to estimate a reflection generation position in the left-right direction, and a threshold Th is set such that the threshold Th increases when the reflection generation position is on the left side, which is a driver's seat side. If the maximum value of A, A, A, and Aexceeds the threshold Th, the approach of the user's hand is detected.

Proximity detection device to detect a user's approach to a display surface comprising a sensitivity setting unit

An electrostatic-capacitive proximity detecting device includes an electrode unit including a plurality of electrodes linearly arranged along one direction; an electrostatic capacitance detector that drives the electrodes in a time division manner and detects detection values corresponding to electrostatic capacitances between a to-be-detected object and the respective electrodes; and a position detector that detects a position of the to-be-detected object in the one direction, based on arrangement positions of the respective electrodes in the one direction and a bias in magnitudes of the detection values detected for the respective electrodes by the electrostatic capacitance detector.

Electrostatic-capacitive proximity detecting device and method for detecting position of to-be-detected object

Implementations of a proximity detection device according to the present disclosure include a plurality of light emitting elements and a plurality of light receiving elements arranged in a lower portion of a touch panel display. The proximity detection device detects an object that is in proximity by reflected light received by the light receiving elements when irradiation light from the light emitting elements is reflected by the object. Implementations of a proximity detection device includes a drive circuit sequentially driving the plurality of light emitting elements, a measurement circuit measuring detection levels of the light receiving elements when the plurality of light emitting elements sequentially emit light, respectively, and a control unit having a function to estimate a position in the horizontal direction from a plurality of measurement results and correct the estimated position.

Proximity detection device

A proximity detection device detects the proximity of an object using a light emitting element and a light receiving element that receives reflected light of irradiation light from the light emitting element reflected by the object. A mirror is provided near the light emitting element to reflect part of the irradiation light emitted from the light emitting element toward an area at which the irradiation light from the light emitting element does not sufficiently arrive, and a mirror is provided near the light receiving element to enable reception of the reflected light from the light emitting element in a wide range.

A plurality of infrared LEDs, e.g., four, and a plurality of photodiodes, e.g., two, are arranged side by side in interleaved fashion in the order of an LED, a PD, an LED, an LED, a PD, and an LED, and are arranged slightly outside a side of the display surface. A threshold value Th is set so as to become small as max(Ei)/max(Aj) calculated from a detection signal of the PDwhen the LEDemits light, a detection signal of the PDwhen the LEDemits light, a detection signal of the PDwhen the LEDemits light, a detection signal of the PDwhen the LEDemits light, a detection signal of the PDwhen the LEDemits light, and a detection signal of the PDwhen the LEDemits light, and the approach of the hand of the user is detected when max(Aj) exceeds the threshold value.

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Iwaki, Japan

Teiichi Ichikawa