JPH09159802A - Film lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a clouding of a film lens by forming a resin layer high in absorption on at least one surface of the film lens to rapidly absorb dew condensation water caused on the film lens and to uniformly disperse. SOLUTION: The film lens 1 is composed of a laminated film 2 laminating two sheets of a usual film and a transparent absorption layer 3 formed on a surface of an inside of the laminated film 2. This absorption layer 3 is composed of a transparent bonding layer 7, a resin layer 8 high in absorption and a surface protective layer 9, and the resin layer 8 high in absorption is stuck on the surface 5a of the film 5 of the inside of the laminated film 2 by interposing the bonding layer 7. The transparent resin layer 8 high in absorption is, for example, a thin film on the film formed with a starch-poly (sodium acrylate) graft polymer. Then, at the time of mounting, the dew condensation water generated on an inner surface of the film lens 1 due to a temp. difference at internal and external is allowed to penetrate the surface protective layer 9 and reach the resin layer 8 high in absorption and absorbed to the resin layer 8 and dispersed uniformly in the resin layer 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film lens used for goggles, helmets and the like.

[0002]

2. Description of the Related Art Conventionally, a film lens used for goggles or the like is fogged due to dew condensation of moisture in the air due to sweating from the human body on the inner surface having a high temperature due to the temperature difference between the inside and the outside when worn. This may obstruct the sight of the wearer. As a countermeasure against this, fogging is prevented by laminating two film lenses or applying an antifog agent to the film lens.

[0003]

However, in the above-mentioned fog prevention method, the duration of the fog prevention effect is short,
It was not suitable for long-term wear.

The present invention has been made in order to solve the above problems, and provides a film lens for removing fog from the film lens used in goggles, helmets, etc. to prevent fogging. To aim.

[0005]

In order to achieve this object, the film lens according to claim 1 is intended for use in goggles, helmets and the like, in particular, at least on one surface of the film lens. Since the water absorbent resin layer is formed, the resin layer can quickly absorb and evenly disperse the condensed water generated on the film lens, thereby preventing the film lens from fogging.

Further, in the film lens according to the second aspect, since the super absorbent polymer layer is formed by adhering the super absorbent resin to the film lens with a transparent adhesive, the film lens can be securely attached to the film lens. It can be fixed and the transparency does not decrease.

Further, in the film lens according to the third aspect, since the surface protective layer having the property of transmitting water is provided on the highly water-absorbent resin layer, the resin layer is protected and the condensed water is prevented. The resin layer can be surely absorbed by the resin layer after passing through.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a partial cross section of the film lens of this embodiment.

The film lens 1 is composed of a laminated film 2 obtained by laminating two ordinary films and a transparent water absorbing layer 3 formed on the inner surface of the laminated film 2.

The laminated film 2 is usually used and is formed by adhering two films 4 and 5 with an adhesive, for example, transparent polyvinyl butyral 6.

The water absorbing layer 3 is composed of a transparent adhesive layer 7, a super absorbent resin layer 8 and a surface protective layer 9, and the super absorbent resin layer 8 is a film 5 inside the laminated film 2 with the adhesive layer 7 interposed therebetween.
Is adhered to the surface 5a. The transparent super absorbent resin layer 8 is
For example, a thin film on a film formed by starch-sodium polyacrylate glast polymer. Other examples of this highly water-absorbent resin include starch-polyacrylonitrile glast polymer.

The adhesive layer 7 is made of the same adhesive as the adhesive 6 of the laminated film 2 and has a thickness of several μm.

The surface protective layer 9 is an extremely thin polyester film with a surface-hardened film, and is adhered to the surface of the super absorbent polymer layer 8 to protect the surface.

In this way, the transparent water absorbing layer 3 is formed on the inner surface of the film lens 2.

During mounting, the dew condensation water generated on the inner surface of the film lens 1, that is, the surface of the surface protection layer 9 due to the temperature difference between the inside and the outside, penetrates the protection layer 9 and reaches the highly water-absorbent resin layer 8, and this resin layer 8 and is evenly dispersed in the resin layer 8. The water absorbed in the super absorbent polymer layer 8 is chemically trapped in the molecules of the super absorbent resin layer 8,
Therefore, the absorbed water does not adversely affect the adhesive portion with the adhesive layer 7. Further, the water absorbed by the super absorbent resin layer 8 can be evaporated by applying an electric field to the super absorbent resin layer 8. Also, the film lens 1
Even if left unattended, the absorbed water will evaporate spontaneously over time.

In this way, the dew condensation water generated on the inner surface of the film lens 1 is absorbed in an extremely short time, and the film lens 1 is prevented from fogging.

The present invention is not limited to the embodiments described in detail above, and various modifications can be made without departing from the scope of the invention.

For example, in the above-mentioned embodiment, the super absorbent resin layer 8 is provided on the inner surface of the film lens 1, but it may be provided on the outer surface, or on both the inner surface and the outer surface. Of course.

[0020]

As is apparent from the above description, the film lens according to claim 1 is intended for use in goggles, helmets and the like, and in particular, has a high water absorption property on at least one surface of the film lens. Since the resin layer is formed, dew condensation water generated on the film lens can be quickly absorbed and uniformly dispersed by the resin layer, and the film lens can be prevented from fogging. Also,
Since the anti-fogging effect is highly durable, it can be used for a long time.

Further, in the film lens according to the second aspect of the present invention, since the super absorbent polymer layer is formed by adhering the super absorbent resin to the film lens with a transparent adhesive, the film lens can be securely attached to the film lens. It can be fixed and the transparency does not decrease.

Further, in the film lens according to the third aspect, since the surface protective layer having a property of transmitting water is provided on the highly water-absorbent resin layer, the resin layer is protected and the condensed water is prevented. The resin layer can be surely absorbed by the resin layer after passing through.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a film lens according to an embodiment of the present invention.

[Explanation of symbols]

 1 Film Lens 2 Laminated Film 3 Water Absorption Layer 7 Adhesive Layer 8 Super Water Absorption Resin Layer 9 Surface Protection Layer

Claims (3)

[Claims] 1. A film lens used for goggles, helmets, etc., wherein a superabsorbent resin layer is formed on at least one surface of the film lens, and the resin layer absorbs condensed water generated on the film lens, A film lens for preventing fogging of the film lens. 2. The film lens according to claim 1, wherein the superabsorbent resin layer is formed by adhering the superabsorbent resin to the film lens with a transparent adhesive. 3. The film lens according to claim 1, wherein a surface protective layer having a property of transmitting water is provided on the super absorbent polymer layer.