Sony Semiconductor Solutions Corporation

Akihito Kamiegawa

Katsuhisa Daio

Takeshi Yuwaki

Hayato Kamizuru

Shouichi Kuroki

Masatoshi Kitada

Naoki Masumitsu

Provided is a light-emission driving device that includes a light-emission current detection unit, a phase difference detection unit, and a delay unit. The light-emission current detection unit detects a light-emission current for causing a light-emitting element to emit light, the light-emission current being supplied from a light-emission driving unit. The phase difference detection unit detects a phase difference between the detected light-emission current and a drive signal for controlling the supply of the light-emission current in the light-emission driving unit. The delay unit adjusts propagation delay of the drive signal in accordance with the detected phase difference, and supplies the adjusted drive signal to the light-emission driving unit as a drive signal.

Light-emission driving device and light-emitting device

An abnormality of output laser light is detected for enhancement in safety. A light-source drive device includes a light-source control unit, a light-receiving unit, and an abnormality detection unit. The light-source control unit included in the light-source drive device controls light emission of a light source. The light-receiving unit included in the light-source drive device receives light from the light source through an output part allowing outward output of light of the light source. The abnormality detection unit included in the light-source drive device detects an abnormality of the light output from the output part, on the basis of the received light.

Light-source drive device and light-emitting device

The present invention relates to a driving device, a driving method, and a light-emitting unit that make it possible to appropriately drive a light-emitting element. The driving device according to the present invention includes: a setting section () that sets at least one of a bias current of a light-emitting element (an LD) or a target current for setting output light from the light-emitting element (the LD) to desired intensity on the basis of a result of detection of an offset light amount when the light-emitting element (the LD) does not emit light; and an output controller () that controls an output of a driving current of the light-emitting element (the LD) on the basis of at least one of the set bias current or the set target current. The detection of the offset light amount is performed by a light-receiving element (a PD) that receives a portion of the output light. The present invention is applicable to a ranging module, for example.

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KANAGAWA, Japan

Akihito Kamiegawa