The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11229102 B1

Date of Patent:

Jan. 18, 2022

Filed:

Apr. 22, 2020

Lighting device

Applicant:

Rohm Co., Ltd., Kyoto, JP;

Inventors:

Noboru Takizawa, Kyoto, JP;

Masaaki Nakayama, Kyoto, JP;

Assignee:

Rohm Co., Ltd., Kyoto, JP;

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Minh D A

Int. Cl.

CPC ...

H05B 45/46 (2020.01); H05B 45/10 (2020.01); H05B 45/3725 (2020.01); H02M 1/00 (2006.01);

U.S. Cl.

CPC ...

H05B 45/46 (2020.01); H05B 45/10 (2020.01); H05B 45/3725 (2020.01); H02M 1/0067 (2021.05); Y02B 20/40 (2013.01);

Abstract

A lighting device includes light emitting element groups (HSB) including a light emitting element group (HS) that emits light when being applied with a voltage at a light emission reference voltage (VH), and a light emitting element group (HS) that emits light when being applied with a light emission reference voltage (VH) higher than the light emission reference voltage (VH), the light emitting element groups (HSB) emitting light when being applied with a voltage equal to or higher than a light emission reference voltage (VHa); a semiconductor chip (IC) including a light emission control unit (HC) arranged to perform light emission control to cause light emission of a light emitting element group (HS) if a drive voltage (Vk) is higher than the light emission reference voltage (VHa), and to perform light emission stop control to stop the light emission if the drive voltage (Vk) is lower than the same; and a semiconductor chip (IC) including a light emission control unit (HC) arranged to perform light emission control to cause light emission of a light emitting element group (HSa) if the drive voltage (Vk) is higher than the light emission reference voltage (VHa), and to perform light emission stop control to turn off the emitting element group (HSa) if the drive voltage (Vk) is lower than the same.

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