JP3236741B2 - Manufacturing method of polarized lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a polarizing lens suitable for fishing (fishing) sunglasses and a sunglass using the polarizing lens.

[0002]

2. Description of the Related Art Conventionally, polarized lenses in dark sunglasses used for fishing generally include a polyhalogenated polarizing film (an iodine compound arranged on a PVA uniaxially stretched oriented film) between two lenses. A polarizing film is embedded in a single lens by sandwiching and bonding and fixing, or by molding. Usually, the visible light transmittance is on the order of 20% (the limit is 35% even with a special polarizing lens). ) And the degree of polarization was 90% or more.

By the way, in order to sufficiently exhibit the function as a sunglass using a polarizing lens, a high degree of polarization is given priority, and a degree of polarization of 90% or more is generally required. As a result of trying to obtain such a sufficient degree of polarization, it was unavoidable that the visible light transmittance was slightly lowered. The major drawback was that it was not possible to obtain a sufficiently bright view during weak sunrise, sunset, or cloudy weather.

[0004] In view of the above, it is desirable to obtain a polarizing lens having a higher visible light transmittance, preferably 40% or more, if possible, with a polarization degree of 90% or more.

[0005]

SUMMARY OF THE INVENTION The inventors of the present invention have developed the theoretical structure of polarized light of a commercially available polyhalogen polarizing film (an iodine compound is arranged on a uniaxially stretched PVA oriented film) for a polarizing lens used in such conventional sunglasses. Was re-examined, and it was understood that the polarization of the iodine compound was caused by the bonding between the molecules oriented and aligned by the stretching of the PVA and the iodine compound. And it turned out that it is not possible to easily increase or decrease the bond between the molecules oriented and aligned by stretching and the iodine compound in such a polyhalogen polarizing film.

Accordingly, the present inventor has further studied, and as a result, has noticed that the polyhalogen polarizing film uses an iodine compound as a dichroic substance, and this iodine compound is a substance weak to high heat. . Utilizing this property, if the iodine compound of the polyhalogen polarizing film embedded in the lens is thermally decomposed by heating at an appropriate temperature for an appropriate time, it is presumed that the degree of polarization naturally declines. Furthermore, it was thought that the visible light transmittance could be increased theoretically. This idea, once
Since the iodine compound is decomposed after the plastic molecules are appropriately bonded to the iodine compound, the opposite concept is considered from the viewpoint of manufacturing a polarizing lens.

[0007] There are roughly two types of conventional polarizing lenses. One is a polarizing lens manufactured by fixing a multi-halogen polarizing film in a sandwiched state with a thermosetting adhesive to two lenses, and the other is a multi-halogen polarizing film by plastic molding. It is a polarized lens manufactured by being embedded. In the former case, since the multi-halogen polarizing film is merely heated to a relatively low temperature of at most 60 ° C. to 70 ° C., it is recognized that the thermal decomposition of the iodine compound does not proceed. Can be On the other hand, the latter is affected by heat because it polymerizes the resin monomer.
Since the temperature is relatively low at about 0 ° C.,
As a result, it is recognized that the thermal decomposition of the iodine compound does not proceed.

The present invention has been made in view of the state of the art.
Although it is an inexpensive polarizing lens manufactured by attaching a polyhalogen polarizing film to the lens, the degree of polarization is 90%.
It is an object of the present invention to improve the performance of a polarizing lens by improving the transmittance of visible light to 40% or more as described above.

[0009]

The inventor of the present invention has conducted further studies based on the above-mentioned point of view (that is, heat treatment of a polyhalogen polarizing film based on a concept contrary to the conventional theory), and has repeated the tests. As a result, the iodine compound of the polyhalogen polarizing film embedded in the lens is relatively easily decomposed, and the transmittance of visible light is increased to 40% or more while securing the degree of polarization of 90% or more required for the polarizing lens. They found a unique temperature range that could be improved.

[0010] That is, in one method of manufacturing a polarized lens according to the present invention, a polyhalogenated polarizing film is fixed between two lenses in a sandwiched state with an adhesive therebetween. Heat treatment at temperatures between 90 ° C and 120 ° C
And heat the iodine compound of the polyhalogen polarizing film.
By decomposing, a polarized lens having a polarization degree of 90% or more and a visible light transmittance of 40% or more is obtained.

In another method for manufacturing a polarizing lens according to the present invention, after fitting a mold on both sides of a gasket and disposing a polyhalogen polarizing film between both molds,
The polyhalogen polarizing film is embedded in a single lens by molding the resin monomer between the two molds and polymerizing and curing the resin monomer.
Heat treatment at a temperature of C to 120 ° C.
By pyrolyzing the iodine compound of the polarizing film
In addition , a polarized lens having a polarization degree of 90% or more and a visible light transmittance of 40% or more is obtained.

By attaching the polarizing lens obtained by the above manufacturing method to a frame, desired sunglasses can be obtained.

In the present invention, the lens may be made of glass or plastic in the method of bonding the two lenses described above. In addition, in the bonding method and the molding method, it does not matter whether the lens has a degree of correction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for manufacturing a polarizing lens according to the present invention and sunglasses using the polarizing lens manufactured by the method will be described below with reference to the drawings. First Embodiment FIG. 1 is a central longitudinal sectional view of a polarizing lens 1, in which a polyhalogen polarizing film 3 is fixed between a front lens 1a and a rear lens 1b via a thermosetting adhesive 2. are doing.

The front lens 1a and the rear lens 1b
Is made of plastic in this embodiment. The multi-halogen polarizing film 3 is usually composed of a polarizing film, a protective film or a protective resin layer for protecting the polarizing film, and a base sheet. However, since a known film is used, a detailed description is omitted here. .

This polarizing lens is manufactured, for example, by the following method. First, a thermosetting adhesive 2 is applied to two lenses, a front lens 1a and a rear lens 1b, and then the halogen polarizing film 3 is applied to both lenses 1a and 1b.
b. Then, the obtained polarizing lens is fixed at 120 ° C. for 3 hours.
Heat treatment for hours. For this heat treatment, for example, a hot air drying furnace was used. 120 ° because of using thermosetting adhesive
Even if heated to C, the adhesion is not impaired. As a result, the polarization degree was 92.4% and the transmittance of visible light was 45.2.
% Polarized lens was obtained.

Second Embodiment FIG. 2 is a central longitudinal sectional view of a polarizing lens 1 manufactured by molding a known plastic, and a polyhalogen polarizing film 2 is embedded in one lens 4.

This polarizing lens is manufactured, for example, by the following method. First, as shown in FIG. 3, the molds 6 and 7 are fitted on both sides of the gasket 5 and the polyhalogen polarizing film 3 is arranged between the two molds 9. By polymerizing and curing and removing the mold, the polarized lens 1 shown in FIG. 2 is obtained. Thereafter, the obtained polarizing lens is subjected to a heat treatment at 90 ° C. for 60 hours. For this heat treatment, a hot-air drying furnace was used as described above. As a result, a polarized lens having a degree of polarization of 93.3% and a transmittance of visible light of 40.2% was obtained.

Table 1 shows the results of an experiment conducted by sequentially changing the heat treatment temperature of the above-mentioned polarizing lens in comparison with a conventional polarizing lens.

[0020]

[Table 1]

The degree of polarization is obtained by the following equation. Here H1
Is the orthogonal transmittance (the transmittance when the polarization axes are combined in parallel), and H2 is the cross transmittance (the transmittance when the polarization axes are combined orthogonally).

(Equation 1)

According to the results of this experiment, the higher the heat treatment temperature, the higher the transmittance, but the lower the degree of polarization. This is because the iodine compound of the polyhalogen polarizing film is decomposed at a high temperature to decrease. It is presumed that it is.

Next, Table 2 shows the results of experiments conducted by sequentially changing the heat treatment temperature and the treatment time of the polarizing lens.

[0024]

[Table 2]

From this experimental result, it is understood that, even at a relatively low processing temperature (90 ° C.), if the processing time is lengthened, the degree of polarization can be maintained at 90% or more while the transmittance is increased. This indicates that the decomposition of the iodine compound in the polyhalogen polarizing film proceeds with time even at a relatively low processing temperature (90 ° C.).

FIG. 3 shows a sunglasses 11 for fishing according to the present invention, in which a polarizing lens 1 manufactured by the above-described method is attached to a frame 12. Further, the sunglasses according to the present invention may be configured such that the polarizing lenses are connected to each other by a bridge member, and a temple is connected to an outer portion of the polarizing lenses. When wearing these fishing sunglasses, it is possible to cut off diffuse reflections on the water surface while maintaining sufficient brightness in low light (during sunrise and sunset), and to accurately capture the movement of the float. Becomes

[0027]

According to the present invention, the polyhalogenated polarizing film embedded in the lens can be moved to a predetermined temperature range (90 to 120 °).
By simply performing the heat treatment in C), there is an advantage that an extremely excellent polarized lens having a polarization degree of 90% or more and a visible light transmittance of 40% or more can be provided at low cost.

By applying such a high-performance polarizing lens to sunglasses for fishing in particular, it is possible to cut off diffuse reflections on the water surface while securing sufficient brightness at low light, for example, at sunrise and sunset. When fishing on a cloudy day, you can enjoy comfortable fishing without overlooking the movement of the float.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing a polarizing lens in which two lenses are bonded together.

FIG. 2 is a central vertical sectional view showing a molded polarizing lens.

FIG. 3 is a cross-sectional view illustrating a manufacturing process of a molded polarizing lens.

FIG. 4 is a perspective view showing fishing sunglasses to which the polarizing lens of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polarizing lens 1a Front lens 1b Rear lens 2 Adhesive 3 Polyhalogen polarizing film 11 Fishing sunglasses

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-181015 (JP, A) JP-A-5-215998 (JP, A) JP-A-61-235113 (JP, A) JP-A-62-1987 173427 (JP, A) JP-A-4-204803 (JP, A) JP-A-63-311203 (JP, A) Supervised by Ryo Nagata "Application of Polarizing Film" CMC Corporation, published February 10, 1986 102 -Page 106 PVA-Iodine polarizing film (58) Fields investigated (Int. Cl. ⁷ , DB name) G02C 7/12 B29D 11/00 G02B 5/30

Claims (2)

(57) [Claims] 1. A multi-halogen polarizing film is sandwiched and fixed between two lenses via a thermosetting adhesive, and then the whole of the bonded body is heated to 90 ° C. to 120 ° C.
By heat-decomposing the iodine compound of the polyhalogen polarizing film, the degree of polarization is 90%.
A method for producing a polarized lens, characterized in that a polarized lens having a visible light transmittance of 40% or more is obtained as described above. 2. A mold is fitted on both sides of a gasket, a polyhalogen polarizing film is arranged between the molds, and then a resin monomer is filled between the molds and polymerized and cured to form the polyhalogen polarizing film. The film is embedded in a single lens, and then this lens is
Heat treatment at a temperature of 0 ° C. to 120 ° C. to thermally decompose the iodine compound of the polyhalogen polarizing film, so that the polarization degree is 90% or more and the visible light transmittance is 40%.
A method for manufacturing a polarizing lens, comprising obtaining the above polarizing lens.