Method and device for producing polarizing film having local polarization effect

Abstract

The invention relates to a method for producing a polarizing film having local polarization effect. A dyeing process is realized by the following steps of: 1) dyeing small areas; 2) uninterruptedly dyeing, wherein the upper side of an upper dyeing cylinder (3) is provided with a liquid receiver (6); the top of the liquid receiver (6) is provided with a liquid feed port (8), while the bottom is connected with a liquid feed control system; the outer wall of the upper dyeing cylinder (3) is circumferentially provided with a dying bump (4) at intervals of 90 DEG; and a plurality of dying bumps (4) which are parallelly spaced are radially arranged. The method is characterized in that: the liquid feed control system automatically controls the dying bumps (4) to dye. A device for producing the polarizing film having the local polarization effect has a completely transparent lens and does not polarize light. Only the exterior viewing position of human eye pupils on the middle upper part of the lens has polarized light discoloration effect in small areas. A polarizer is combined with a liquid crystal light valve to realize depth change of colors in the process of electronic control so as to achieve the effects of making drivers clearly see pavements during driving at night, shielding highlight and reducing dazzling.

Description

Technical field [0001] The invention relates to the field of polarizing film production, in particular to a device and production method for polarizing film with partial polarization effect. The partially polarized polarizing film is specially used for the production of lenses of shading glasses to prevent glare when meeting cars at night. Background technique [0002] Commercially available polarized sunglasses, polarized fishing glasses, polarized driver lenses and other polarized glasses are made of polarizers with the same overall degree of polarization. The polarized film used in the intermediate layer of this polarized lens is processed by conventional stretching and dyeing. The entire surface of the PVA film is made of evenly dip-dyeing and adsorbing dichroic iodine or dyes. The overall light transmittance is between 25% and 45%. The protective layer is cut and processed into sunglasses. The polarizing effect is used to block the daylight. Strong reflected light has excel...

AI Technical Summary

Problems solved by technology

But at night, because polarized lenses have a uniform degree of polarization as a whole, the light transmittance is no more than 45%. The light transmittance reaches the mandatory standard of 75%, so the polarizing film glasses lenses made by this process cannot be used well at night

The above-mentioned limitations can be solved by using partially polarized polarizing film, that is, the lens is transparent as a whole, non-polarized, and only has a small area of ​​polarized color-changing effect in the upper middle part of the lens where the human pupil looks outside the pupil, but so far, there is no such kind in the market. The advent and sale of the product, and the production process and related patent literature and reports on the production and manufacture of partially polarized polarizing films have not been consulted.

Images