公开(公告)号：US20240126393A1

公开(公告)日：2024-04-18

申请号：US18466161

申请日：2023-09-13

Applicant: Alps Alpine Co., Ltd.

Inventor： Teiichi Ichikawa ,  Shohei Yoshida

IPC: G06F3/042

CPC classification number: G06F3/0421 ,  G06F2203/04108

Abstract: 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.

公开(公告)号：US12118165B2

公开(公告)日：2024-10-15

申请号：US18466161

申请日：2023-09-13

Applicant: Alps Alpine Co., Ltd.

Inventor： Teiichi Ichikawa ,  Shohei Yoshida

IPC: G06F3/042

CPC classification number: G06F3/0421 ,  G06F2203/04108

Abstract: 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.