Ring light with LED strip, reflector optics and gesture-controlled color temperature regulation

Abstract

Ring light with a ring-shaped housing, an LED strip arranged in a groove with adjustable color temperature (Tunable White) and at least two external sensors for gesture-controlled control of light functions, characterized in that an additional sensor is arranged on the inside of the ring, which serves exclusively for the synchronous change of the color temperature of uplight and downlight functions depending on a detected gesture.

Description

1. Technical field

[0001] The invention describes a ring-shaped LED light ( Fig. 1) with direct and indirect light distribution, tunable white function and gesture-controlled operation, especially for applications in the field of general lighting in the version as a pendant luminaire. 2. State of the art

[0002] In the current state of the art, ring lights with integrated LED strips as light sources and sensors for contactless control of lighting functions are known. The sensors are usually located on the outer top or bottom of the housing and enable functions such as switching, dimming, or color temperature adjustment.

[0003] Tunable white LED strips are also known, as are their control methods for adjusting the color temperature. In known solutions, the color temperature is usually controlled by the same external sensors that also switch the light on or off.

[0004] A targeted separation of control functions (e.g., light activation and dimming versus color control) via clearly defined, spatially separated sensors is not yet known in connection with ring-shaped luminaires. 3. Object of the invention

[0005] The invention aims to provide a ring light that: • creates a homogeneous, indirect light distribution upwards (uplight) and / or downwards (downlight), • Switching on / off and dimming can be controlled touchlessly via gestures, • makes the color temperature of the LED lighting intuitively changeable, • and provides a clear functional and geometric separation of the sensors for switching on / off and dimming from the color temperature control. 4. Solution to the task

[0006] The task is solved by a ring light with the following features: 1. Ring-shaped luminaire housing (10) with a continuous triangular or trapezoidal groove at the top and / or bottom. 2. An LED strip (20) with tunable white LEDs is attached to the vertical side of the groove, with the LEDs emitting light perpendicular to the groove surface. 3. Inventive feature: The opposite groove wall is inclined at approximately 45° and provided with a reflective film (40) [e.g. MCPET] or with a highly reflective and light-scattering surface coating to deflect the light from the LED strip towards the diffuser. 4. Light is emitted via a translucent, ring-shaped curved diffuser (30) made of polycarbonate (PC) or polymethyl methacrylate (PMMA), which enables homogeneous light emission with high mechanical stability and economical production. 5. Two sensors (90) [e.g. PIR or capacitive] are attached to the top and bottom of the luminaire to control uplight and downlight functions as well as dimming by gestures. 6. Inventive feature: A third gesture sensor (100) is positioned on the inside of the light ring and is intended exclusively for gesture-controlled changing of the color temperature (CCT) of the LED strip (20). 5. Advantages of the invention • Functional separation of gesture control: Light switching / dimming via external sensors (90), CCT control via internal sensor (100). • Intuitive operation: The light color is controlled specifically within the user's field of vision, independent of other lighting functions. • Design advantage: The internal sensor (100) is not visible and does not disturb the optics or geometry of the light. • High light quality through indirect light guidance, reflective groove surface (40) and optically adapted diffuser (30) made of PC. • Robust construction through the use of PC for the diffuser (30) and clip technology for mounting without risk of cracking. 6. Example of implementation

[0007] A preferred embodiment shows a ring light with an aluminum profile support (10), two LED strips (20) [top and bottom] equipped with warm white and cool white LEDs, inclined, highly reflective surfaces for light deflection (40), and translucent polycarbonate diffusers (30) with a radial bending radius. The ring is interrupted at one point. This gap is closed with a plastic cover (60, 70) in which the control electronics (80) are located. Two PIR sensors (90) located under the cover – top and bottom – control the uplight and downlight respectively. A proximity sensor (100) [e.g., IR or capacitive] integrated on the back of the control assembly, which is operated from the inside of the ring, allows the color temperature of both LED strips to be adjusted in discrete steps or continuously by means of a hand gesture.This sensor (100) reacts exclusively to targeted interaction in close proximity on the inner surface of the light. 7. Summary • The present invention describes a ring-shaped luminaire with separately controlled light and color temperature functions, wherein a third, internally located gesture sensor serves specifically for user-friendly adjustment of the color temperature. This element distinguishes the invention from the prior art and establishes its patentability. The present invention describes a ring-shaped luminaire for which cost-effective and highly efficient LED strips are used. These strips are mounted perpendicular to the light emission plane and reflect a large portion of the light upwards by means of opposing, inclined, and highly reflective surfaces. The resulting good light mixing ensures a homogeneous light impression, allowing the use of translucent diffuser materials made of ring-shaped, bent plastic profiles with high transmittance, without individual LED spots being visible from the outside. These three design features of a ring-shaped luminaire distinguish the invention from the prior art and justify its patentability.

Claims

[1] Ring light with a ring-shaped housing, an LED strip arranged in a groove with adjustable color temperature (Tunable White) and at least two external sensors for gesture-controlled control of light functions, characterized by , that an additional sensor is located on the inside of the ring, which serves exclusively to synchronously change the color temperature of the uplight and downlight functions depending on a detected gesture. [2] Ring light according to claim 1, characterized by that the additional sensor is a proximity or optical gesture sensor. [3] Ring light according to one of the preceding claims, characterized by that the sensor is not visibly located below or behind an area of ​​the inside of the ring profile that is transparent to infrared radiation. [4] Ring light according to one of the preceding claims, characterized bythat the change in color temperature occurs gradually or continuously. [5] Ring light according to one of the preceding claims, characterized by that the light is guided by an inclined, planar and reflective groove surface within the ring profile. [6] Ring light according to any of the preceding claims, characterized by , that the inclined, reflective surface has a concave curvature, the concave surface serving to improve light focusing and light distribution. [7] Ring light according to one of the preceding claims, characterized by that a ring-shaped, translucent diffuser made of polycarbonate is used as the light emission surface. [8] Ring light according to one of the preceding claims, characterized by , that a ring-shaped, translucent diffuser made of polymethyl methacrylate is used as the light emission surface. [9] Ring light according to one of the preceding claims, characterized by, that the control of the light functions and / or the color temperature is optionally carried out via a wireless interface, whereby the optical light guidance is implemented independently of the control type by means of inclined, reflective surfaces within the ring profile and a translucent, ring-shaped curved diffuser.

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