Dual-channel filter and method for preparing dual-channel filter by spin-coating blue dye

Abstract

The invention discloses a dual-channel filter and method for preparing dual-channel filter by spin-coating blue dye. The filter comprises a glass substrate, a blue dye layer arranged on the surface of one side of the glass substrate, an adhesion layer arranged on the blue dye layer, an ultra wide band reflection film arranged on the adhesion layer and a dual-channel filtering sheet arranged on the surface of the other side of the glass substrate. The method comprises steps of coating the glass substrate with the blue dye layer by use of the spin-coating method; by using the vacuum plating method and combining low-energy ions, carrying out auxiliary deposition on the adhesion layer; and by using the vacuum plating method and combining high-energy ions, carrying out auxiliary deposition on the ultra wide band reflection film and the dual-channel filtering sheet. According to the invention, the glass substrate spin-coated with the dye layer and the dual-channel filter have wide application prospects in the field of mobile phone shooting systems, and security television systems.

Description

technical field [0001] The invention relates to a dual-channel filter used in a shooting system, in particular to a dual-channel filter and a method for preparing the dual-channel filter by spin-coating blue dye. Background technique [0002] The single-channel filter in the prior art generally requires the following optical characteristics: transmit visible light of 420-650 nm, cut off ultraviolet light of 350-400 nm and infrared light of 700-1100 nm. So far, the only way to achieve this feature is to rely on optical films, but optical films are bound to have angle effects from the principle of interference, which will cause the same object to produce obvious color gradients and brightness due to different angles of incident light entering the shooting system Gradient, for this purpose, a piece of absorbing blue glass or blue plastic must be used to stabilize the transmission-cutoff transition wavelength at the wavelength of 650nm to eliminate the wavelength drift caused by...

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Problems solved by technology

[0004] Because blue glass has a certain cut-off in the infrared region, it cannot be used in dual-channel filters. Only the optical properties of blue plastic can be used as the substrate of dual-channel filters, but the blue plastic substrate has obvious disadvantages: (1 ) The thickness of a typical blue plastic substrate is only 0.1mm, although the plate aberration can be ignored, but it brings the substrate deformation caused by the stress of the dual-channel filter; (2) The rigidity of the blue plastic substrate is poor, and the area of ​​the image sensor is large (3) The blue plastic is an organic material, while the optical film is an inorganic material, the two are difficult to attach, or in other words, the filter film is difficult to plate on the blue plastic substrate

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