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Color-corrected collimation of light from light sources whose color varies with position

A technology of light source and color, applied in the field of collimator

Active Publication Date: 2020-09-11
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A collimator can be used to reduce CoP variation, but different specifications must be met than in the case of CoA variation

Method used

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  • Color-corrected collimation of light from light sources whose color varies with position
  • Color-corrected collimation of light from light sources whose color varies with position
  • Color-corrected collimation of light from light sources whose color varies with position

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Embodiment Construction

[0029] The presently preferred embodiments of the present invention will now be described more fully with reference to the accompanying drawings. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and will fully convey the scope of the invention to the present disclosure. field technicians.

[0030] Figure 1 to Figure 3 A lighting device 1 with a CoP light source 2 and a collimator 3 is shown. The lighting device 1 may be, for example, a spotlight.

[0031] The collimator 3 is configured to collimate the light from the light source 2 into a light beam propagating in a general lighting direction I of the lighting device 1 . The height h and width w of the collimator 3 are generally much larger than the extension of the light source 2 in any direction. The height h is typically between 10mm and 100mm. The width ma...

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PUM

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Abstract

A collimator (3) for a light source (2) whose color varies with position is provided. The collimator (3) comprises: a focal point (F); an optical axis (OA) containing the focal point (F); an imaging element (4) arranged around or on the optical axis (OA); and An optical expansion element (5, 11, 12) arranged around the optical axis (OA) for receiving at least one image from the imaging element (4). The optical expansion elements (5, 11, 12) have different beam broadening characteristics, and the beam broadening characteristics of each optical expansion element (5, 11, 12) in the optical expansion elements (5, 11, 12) depends on at the position of the light expanding elements (5, 11, 12) relative to the focal point (F). The light expanding element (5, 11, 12) is adapted to expand light impinging on the light expanding element (5, 11, 12) in a first plane (M) comprising the optical axis (OA). Also provided is a method for collimating light from a light source (2) of color varying with position.

Description

technical field [0001] The invention relates to a collimator for a light source whose color varies with position, an illumination device comprising the collimator, and a related method. Background technique [0002] Many applications require a light source that emits uniform white light. Some light sources provide white light by mixing light of different colors. In practice, the light emitted by these types of light sources is usually not uniformly white in the far field where the light source appears as a point source, and various techniques for color correction are known in the art. For example, WO 2013 / 035036 A1 discloses a collimator with rotationally symmetrical surface segments designed for correcting the so-called "color over angle" (CoA) variation. In short, CoA variation arises from the fact that the color of emitted light depends on the emission angle. [0003] Another example of an undesired color change that may occur is known as "color by position" (CoP), whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B19/00F21K9/62
CPCF21K9/62G02B19/0028G02B19/0061F21Y2115/10
Inventor O·德洛斯F·皮杰尔曼H·H·P·戈曼斯
Owner SIGNIFY HLDG BV