A led collimated illumination optical lens for visual inspection
A visual inspection and optical lens technology, applied in lighting devices, lighting and heating equipment, components of lighting devices, etc., can solve problems such as inability to obtain effects, and achieve improved processing accuracy and optical efficiency, convenient manufacturing, and high optical efficiency. Effect
Active Publication Date: 2018-01-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, due to the Lambertian luminous characteristics of LEDs, it is usually not possible to obtain good results when directly applied to lighting systems, and it is necessary to carry out optical design according to the characteristics of LEDs and visual inspection systems.
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[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0055] 1. Set the initial conditions and divide the solid angle of the LED light source.
[0056] First, θ in the coordinate system is the angle between the incident light and the positive direction of the Z axis, and its value range is α is the angle between the outgoing light and the positive direction of the Z axis. Since the lens is used for collimated illumination, here α=0. The refractive index of the lens material is n=1.49386.
[0057] For the free-form surface inside the lens cavity, its main function is to control the exit angle of light. Here set the angle value range of its control to [0,β max ],and the interval [0,β max ] is evenly divided into 200 parts, recorded as β(i), and 0mid ,and Indicates the maximum angle of incidence at which the light emitted from the light source is incident on the inner free-form surface. Discretiz...
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The invention discloses an LED collimating illumination optical lens for visual inspection. The LED collimating illumination optical lens for visual inspection comprises an incident surface and an emergent surface. The LED collimating illumination optical lens for visual inspection is characterized in that the lens comprises three free curved surfaces, a cavity allowing an LED to be installed therein is formed in the center of the bottom surface of the lens, part of the wall of the cavity is a columnar surface and forms the inner side columnar surface, and the other part of the wall of the cavity is a free curved surface and forms the inner side free curved surface; the inner side free curved surface is located at the top of the inner side columnar surface, and the incident surface is formed by the inner side free curved surface and the inner side columnar surface; the outer side face of the lens is a free curved surface and forms the outer side free curved surface, the middle of the top surface of the lens is a free curved surface and forms the top free curved surface, a step-shaped plane is arranged on the outer side of the top free curved surface and forms the top plane, and the emergent surface is formed by the top free curved surface and the top plane of the lens. The LED collimating illumination optical lens for visual inspection has the advantages that the optical efficiency is high, the structure is compact and the size is small; the LED collimating illumination optical lens can be used for visual inspection, and round light spots with high collimation can be formed on a target illumination surface.
Description
technical field [0001] The invention relates to the field of LED lighting, in particular to an LED collimating lighting optical lens for visual detection. Background technique [0002] In the visual inspection system, the lighting source is an important part. The quality of the lighting effect directly affects the imaging quality of the measured object, thereby affecting the subsequent image processing effect, resulting in inaccurate final measurement results. In the precision detection system, the lighting effect of the light source plays a decisive role. The light intensity, stability and illumination uniformity of the light source will have a great impact on the accuracy of the detection system, directly determining the success or failure of the entire detection. [0003] The lighting sources commonly used in visual inspection systems include incandescent lamps, fluorescent lamps, mercury lamps, sodium lamps, LED light-emitting diodes, semiconductor lasers, etc. The se...
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IPC IPC(8): F21V5/04F21Y115/10
CPCF21V5/043
Inventor 张宪民吴衡莫嘉嗣詹镇辉李海
Owner SOUTH CHINA UNIV OF TECH