Low pass filter
A low-pass filter and wave plate technology, applied in the field of optics, can solve problems such as poor chemical stability, large image aberration, and brittle mechanical properties, and achieve the effects of poor chemical properties, reduced imaging aberration, and brittle mechanical properties
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[0028] figure 1 Be the blue glass low-pass filter of prior art and the low-pass filter structure comparison of the present invention, wherein, (a) is the blue glass low-pass filter of prior art, (b) is the low-pass filter of the present invention . In a high-pixel image sensor, at least two or more quartz crystal plates need to be used. figure 1 (a) and (b) refer to the structural comparison under the condition of obtaining the same filtering effect. exist figure 1 In (a), 7 is blue glass with a thickness of about 0.5 mm, and is coated with an infrared cut-off film and an ultraviolet cut-off film 11 on the surface of the light incident side, while 8, 9, and 10 are all quartz crystal plates, for 5 microns The pixel size has a thickness of 0.85mm, and an anti-reflection film 12 is coated on the surface of the light exit side of the quartz crystal plate 10. The total thickness of the blue glass low-pass filter in the prior art is 3.05mm. exist figure 1 In (b), it is the low-...
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