LIGHT-EMITTING UNIT AND OPTICAL SENSOR

WIPO Patent Application WO/2023/243318

A1

In this optical sensor for sensing an object by receiving reflected light from the object with respect to irradiation light with which a sensing area is irradiated, a light-emitting unit (1) for providing irradiation light by light emission comprises: a resonance circuit unit (240) having an inductor (241) and a capacitor (242); a switching element (246) which has a reverse connection protection unit (247) and which switches charge and discharge of the capacitor (242); a strong light-emitting diode (22) which emits light by means of discharge current flowing from the resonance circuit unit (240) side in response to discharge of the capacitor (242); and a weak light-emitting diode (23) which is connected to the switching element (246) so as to be connected, in a reverse protection relationship, to the strong light-emitting diode (22) and which, following the end of light emission of the strong light-emitting diode (22), emits light with lower intensity than that of the strong light-emitting diode (22) by means of return current (Ir) flowing, at lower intensity than that of discharge current, to a reverse connection protection unit (247) side and the resonance circuit unit (240) side.

FUKUTA KAITO (JP)
NIIMURA KOSUKE (JP)

PCT/JP2023/018938

December 21, 2023

May 22, 2023

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DENSO CORP (JP)

G01S7/484; H01S5/06

WO2021079611A1

2021-04-29

JP2021019194A	2021-02-15
JP2022516673A	2022-03-01
JP2017020841A	2017-01-26
US20210111533A1	2021-04-15
US20180261975A1	2018-09-13

YAHAGI Kazuyuki et al. (JP)

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