US 12,452,978 B2Granted

Table lamp

AssigneeSignify Holding B.V.

InventorsDi Lou, Huai Zhou Liao, Zhong Huang, Hua Jie Luo, Alexander Henricus Waltherus Van Eeuwijk

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Abstract

Provided is a table lamp for illuminating a task area of a table. A plurality of light sources are provided, each with a different illumination direction toward the task area. A control arrangement is provided such that the plurality of light sources are controlled based on a position of the observer. Specifically, the control arrangement determines whether each light source meets criteria governing whether the observer may experience direct and reflected glare. Indeed, if a specular peak intensity angle of the light source is less than a reflected glare avoidance angle corresponding to a position of an observer, and a sight angle from the light source to the observer is greater than a direct glare avoidance angle corresponding to the position of the observer, then the light source may be controlled to illuminate the task area. In this way, specularly reflected light glare, as well as direct light glare, may be avoided.

Claims13

Dependent claims

A table lamp for illuminating a task area of a table, the table lamp comprising:

a plurality of light sources, each light source being adapted to emit light in a respective illumination direction toward the task area;
and
a control arrangement configured, for each of the plurality of light sources, to control the light source to illuminate the task area of the table responsive to:
a specular peak intensity angle of the light source being less than a reflected glare avoidance angle corresponding to a position of an observer;
and
a sight angle from the light source to the observer being greater than a direct glare avoidance angle corresponding to the position of the observer;
wherein the specular peak intensity angle of the light source is an angle between a specular peak direction of the light source and a reference plane, and wherein the reflected glare avoidance angle is an angle between the reference plane and a direction between the position of the observer and the position of the light source, and
wherein the reference plane is perpendicular to a direction between the position of the observer and a center of the task area;
wherein the direct glare avoidance angle corresponds to a field of view of the observer;
wherein the directions and angles are delimited in a plane parallel to the task area on the table.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/720,846Filed 22 Dec 2022
Priority: WO PCT/CN2022/0702965 Jan 2022
Published: US 2025/0081311 A16 Mar 2025
Granted: 21 Oct 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H05B 47/115
In response to determined parameters: by determining the presence or movement of objects or living beings
F21S 4/28
With light sources held by or within elongate supports: rigid, e.g. LED bars
F21S 6/003
Table lamps, e.g. for ambient lighting: for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
F21V 21/22
Adjustable mountings: telescopic