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LED light source using PMMA optical filter

An LED light source and optical filter technology, applied in the field of optical filtering, can solve the problems of no band filtering, no filtering, etc., and achieve the effects of high ultraviolet cutoff rate, simple preparation method, and reducing the harm of light radiation.

Inactive Publication Date: 2010-05-12
李欣洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] There are many patent documents about LED light sources, but there are no patents for filtering violet, near ultraviolet, ultraviolet, near infrared, and infrared bands, and there is no PMMA (polymethyl methacrylate, acrylic) with dual functions of cutting ultraviolet rays / infrared rays. ) patented transparent substrate coating process

Method used

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  • LED light source using PMMA optical filter
  • LED light source using PMMA optical filter
  • LED light source using PMMA optical filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] see figure 1 , an LED device 1, in which an LED chip 11 is packaged, and a PMMA filter 2 is located above the LED chip 11 and fixed.

[0044] When working, the light emitted by the LED chip 11 must pass through the optical filter 2 before it can be emitted to the outside. The optical filter 2 filters the light emitted by the LED chip within the range of wavelengths less than 445nm and greater than 700nm.

[0045] LED chip 11 can choose any desired emission wavelength, such as green light with a dominant wavelength of 530nm, or red light with a dominant wavelength of 620nm; another example is blue light with a dominant wavelength of 460nm, and mix a certain proportion in the potting glue YAG powder, the blue light emitted by the LED chip excites the YAG powder, and finally obtains white light with a color temperature of 8000K or other required color temperatures.

[0046] The preparation of the optical filter with dual functions of cutting off ultraviolet rays and infra...

Embodiment 2

[0058] It is basically the same as that of Example 1, except that the preparation of the optical filter is carried out by magnetron sputtering coating inner layer film on PMMA transparent substrate by silicon target material and tantalum pentoxide target material first, on this basis, then by The titanium oxide-cerium oxide target is subjected to magnetron sputtering to coat the outer film to obtain the product.

Embodiment 3

[0060] Basically the same as Embodiment 1, the difference is that the optical filter is molded into a circular lens surface by a PMMA transparent substrate, such as figure 2 shown; or shaped into a square lens surface, and then cleaned and coated.

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Abstract

The invention provides an LED light source using a PMMA optical filter with two functions of cutting off ultraviolet rays and infrared rays. The LED light source comprises an LED device provided with at least one LED chip, and an optical filter which is arranged on the LED device and is used for filtering rays emitted by the LED chip, wherein the light emitted by the LED chip is emitted to the outside by the optical filter; and the optical filter can be added when the LED device is packaged or can be arranged when the LED device is packaged for the second time, or a plurality of LED devices share one optical filter. The optical filter has the two functions of cutting off the ultraviolet rays and the infrared rays and is a transparent substrate formed by PMMA, and the surface of the optical filter is plated with an ultraviolet ray cut-off film layer and an infrared ray cut-off film layer; and the optical filter can absorb the light in a short wavelength range in which the wavelength is less than 445 nanometers and in a long wavelength range in which the wavelength is more than 700 nanometers. The invention also provides the PMMA optical filter with the two functions of cutting off the ultraviolet rays and the infrared rays and a preparation method thereof.

Description

technical field [0001] The invention belongs to the technical field of LED lighting. Specifically related to light filtering technology. technical background [0002] With the advent of ultra-bright LEDs, their efficiency is getting higher and higher, and their prices are gradually falling. At the same time, LED has the characteristics of long life, shock resistance, high luminous efficiency, no interference, no fear of low temperature, no mercury pollution and high cost performance. It is a great potential product that is favored by the semiconductor industry to replace traditional lighting appliances. Ultra-high-brightness LEDs have greatly expanded the application of LEDs in various signal display and lighting source fields, such as interior and exterior lights of automobiles, various traffic lights, indoor and outdoor information displays and backlights. Using LED products for lighting will provide a wider application space for LEDs. [0003] As the application range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V9/00F21V9/04F21V9/06H01L33/00F21Y101/02F21Y115/10
CPCF21Y2101/02F21Y2115/10
Inventor 李欣洋
Owner 李欣洋
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