Optical filter
A technology of optical filter and optical film, which is applied in the direction of optics, optical components, chemical instruments and methods, etc., can solve problems such as reducing volume and weight, reducing aberration, and reducing thickness, so as to improve production efficiency and price Expensive, the effect of improving the yield
Active Publication Date: 2014-12-31
HANGZHOU KOTI OPTICAL TECH
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Problems solved by technology
After changing the substrate from a blue glass substrate to a blue plastic substrate, the thinner blue plastic substrate can have a sufficiently steep transmission-cutoff transition region, but there are two new problems on the whole: the blue plastic substrate does not It is easy to deform after being thin and the adhesion between the blue plastic substrate and the optical film needs to be further improved. If these two new problems are properly solved, the optical filter can not only reduce the price, reduce the volume and weight, but also because of the use of Optical filters made of blue plastic have thinner thicknesses and reduced aberrations resulting in better image quality than optical filters made of blue glass
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[0025] figure 1 Shown is a schematic structural diagram of an optical filter using blue glass in the prior art, including a blue glass substrate 7, an antireflection film 8 arranged on one side of the blue glass substrate 7 and an antireflection film 8 arranged on the other side of the blue glass substrate 7 The existing infrared-ultraviolet filter film 9, the thickness of the blue glass substrate 7 needs to be about 0.5mm to obtain the steepness of the transmission-cutoff transition zone that barely meets the requirements, although this causes the problem of increased aberration, but the benefits It is to reduce the deformation of the blue glass substrate 7 caused by the film stress. The two surfaces of the blue glass substrate 7 are usually coated with an anti-reflection film 8 and an existing infrared-ultraviolet filter film 9. The anti-reflection film 8 is: Usually 3 layers of film composed of 3 kinds of materials are required. The existing infrared-ultraviolet filter film...
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Abstract
The invention discloses an optical filter, which comprises a substrate and optical films on the two sides of the substrate, wherein the substrate is a blue plastic substrate; a blue glass substrate is substituted by the blue plastic substrate; and thus, the production cost, the product weight and the product size can be reduced and the yield of products can be improved. In a preferred technical scheme, in order to improve the adhesion between the substrate and the optical films on the two sides of the substrate, an HfO2 transition layer is arranged between the substrate and the optical films. In order to improve the deformation of the blue plastic substrate, the optical films are an infrared ray isolating filter film on one side of the substrate and an infrared-ultraviolet ray isolating filter film on the other side of the substrate. The optical filter has the advantages of low cost, light weight, small size and capability of being widely used for card type cameras, mobile phone cameras, monitoring systems and the like with small image chip areas, particularly intelligent mobile phones increasingly used at present.
Description
technical field [0001] The invention relates to the field of filters used for digital photography, in particular to a low-stress plastic optical filter mainly used in image acquisition systems such as card-type digital cameras, mobile phone cameras and surveillance cameras. Background technique [0002] Image sensor CCD (Charge-coupled Device, charge coupled device) and image sensor CMOS (Complementary Metal-Oxide Semiconductor, metal oxide semiconductor device) used in digital imaging technology are photodetectors with discrete pixels. According to the Nyquist theorem, the highest spatial frequency that an image sensor can resolve is equal to half of its spatial sampling frequency, which is called the Nyquist limit frequency. When the image sensor CCD and the image sensor CMOS are used to capture the target image, when the sampled image exceeds the Nyquist limit frequency of the system, the high-frequency harmonics in the image sensor and the fundamental frequency will caus...
Claims
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IPC IPC(8): G02B5/26B32B27/06B32B9/04
Inventor艾曼灵金波顾培夫寇立选张兰潘帅
OwnerHANGZHOU KOTI OPTICAL TECH