Stock material or miscellaneous articles – Composite – Of polycarbonate
Reexamination Certificate
2001-12-27
2002-09-24
Boykin, Terressa M. (Department: 1711)
Stock material or miscellaneous articles
Composite
Of polycarbonate
Reexamination Certificate
active
06455163
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a transparent optical product to be used for sunglasses, goggles or lenses.
BACKGROUND ART
Assuming an oscillation component of light in a plane including directions of an incident light and a normal as a p polarization and an oscillation component of light in a plane perpendicular thereto as an s polarization, light reflected by a glossy surface such as glass or water surface has a minimum point where the s polarization is monotonously increased with respect to an angle of reflection and the p component is almost zero in the vicinity of 60 degrees. By using a polarizing filter for cutting the s polarization and transmitting only the p polarization, accordingly, it is possible to considerably reduce a dazzling feeling caused by the reflected light. There have been known sunglasses, ski goggles and corrective lenses which have a polarizer in order to relieve a dazzlement caused by the reflected light of the surface of the water, a snowy surface, a road, a windowpane or a metallic surface and to give easiness to see by using the principle.
Moreover, there have been known transparent optical products having a dimming and shielding function formed by kneading a dimming dye (a photochromic dye) into a lens base material or coating the surfaces of lenses with a coating agent containing the dyes, which provide sunglasses, ski goggles or corrective lenses with a dimming function and a shielding function by carrying out coloring under external light including a large number of ultraviolet rays and uncoloring under artificial rays having a small number of ultraviolet rays.
However, there has not conventionally been a practical transparent optical product having a high functionality which has both a polarizing function and a dimming function, prevents a dazzlement from being caused by reflected light and properly changes a light shielding property corresponding to the intensity of external light. A technique for inexpensively providing such a transparent optical product having a high functionality has been desired.
In consideration of the problems described above, the invention can inexpensively provide a transparent optical product having a high functionality which comprises both a polarizing function and a dimming function, prevents a dazzlement from being caused by reflected light and properly changes a light shielding property corresponding to the intensity of external light.
DISCLOSURE OF THE INVENTION
Technical aspect according to the invention to solve the technological problems described above is a transparent optical product having a lamination structure including one polarizer sheet, wherein at least one of layers other than the polarizer sheet has a dimming function.
Another technical aspect according to the invention is that a plurality of sheets comprising one layer polarizer sheet and at least one layer other than the polarizer sheets are mutually bonded with an adhesive or a binder to constitute a composite sheet and at least one of the non-polarizer sheets, adhesive layer or binder layer in the composite sheet has a dimming function.
Yet another technical aspect according to the invention is that three or more layers, one inner layer being a polarizer sheet and the rest not being polarizer sheets, are mutually bonded with an adhesive or a binder to constitute a composite sheet and at least one of the non-polarizer sheets, adhesive layer or binder layer in the composite sheet has a dimming function.
Further technical means according to the invention is that both outermost sheets of the composite sheet are formed of resins of the same structure.
Further technical aspect according to the invention is a transparent optical product having a composite sheet and a resin layer laminated, wherein a plurality of sheets including one polarizer sheet layer and at least one non-polarizer sheet layer are mutually bonded with an adhesive or a binder to constitute the composite sheet, one of outermost layers of the composite sheet and the resin layer are integrated by a thermal molding method, and at least one of the non-polarizer sheets, adhesive or binder layer and the resin layer has a dimming function.
Further technical aspect according to the invention is a transparent optical product having a composite sheet and a resin layer laminated, wherein three or more layers, one inner layer being a polarizer sheet and the rest not being polarizer sheets, are mutually bonded with an adhesive or a binder to constitute the composite sheet, one of outermost layers of the composite sheet and the resin layer are integrated by a thermal molding method, and at least one of the non-polarizer sheet layers, adhesive or binder layers and the resin layer has a dimming function.
Further technical aspect according to the invention is that both of the outermost sheets of the composite sheet are formed of resins of the same structure.
Further technical aspect according to the invention is that one of the outermost sheets of the composite sheet and the resin layer are integrated by an injection compression molding method for the resin layer.
Further technical aspect according to the invention is that at least one of the outermost sheets of the composite sheet is formed of a polycarbonate based resin.
Further technical aspect according to the invention is that the polycarbonate based resin has a mean polymerization degree of 100 or less.
Further technical aspect according to the invention is that one of the outermost sheets of the composite sheet and the resin layer are formed of a polycarbonate based resin.
Further technical aspect according to the invention is that the polycarbonate based resin has a mean polymerization degree of 120 or less.
Further technical aspect according to the invention is that at least one of the outermost layers of the composite sheet is formed of a resin having a modulus of photoelasticity of 30×10
−13
cm
2
/dyne or less and a glass transition temperature of 85° C. or more.
Further technical aspect according to the invention is that one of the outermost sheets of the composite sheet and the resin layer are formed of a resin having a modulus of photoelasticity of 30×10
−13
cm
2
/dyne or less and a glass transition temperature of 85° C. or more.
Further technical aspect according to the invention is that a thickness x of the composite sheet and a thickness y of the resin layer have a relationship of 100≧y/x≧0.3 in every portion within a range of a 35 mm radius from the center of the transparent optical product.
Further technical aspect according to the invention is that an inside surface or surface portion of at least one of the outermost layers of the transparent optical product is processed to provide a dimming function.
BEST MODE OF CARRYING OUT THE INVENTION
The layer structure of a transparent optical product according to the invention will be described. The transparent optical product according to the invention is constituted in a multilayer structure including one polarizer sheet layer, and at least one sheet layer other than the polarizer sheet has a dimming function.
A specific embodiment according to the invention comprises one polarizer sheet layer and at least one non-polarizer sheet layer which are mutually bonded with an adhesive or a binder to constitute a composite sheet (hereinafter referred to as a “composite sheet A” for convenience), and at least one of the non-polarizer sheet layers and adhesive or binder layers has the dimming function.
Specifically, the composite sheet A is constituted by mutually bonding one polarizer sheet layer and one non-polarizer sheet layer with an adhesive or a binder, and at least one of the non-polarizer sheet layer and adhesive or binder layer has the dimming function.
More specifically, the composite sheet A comprises three sheets, central layer being a polarizer sheet, mutually bonded with an adhesive or a binder, and at least one of the non-polarizer sheet layers and adhesive or binder layers has the dimming function. Such a case is one of the most
Oka Koichiro
Okamoto Masahiko
Boykin Terressa M.
Yamamoto Kogaku Co., Ltd.
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