Protective device for eyes
A protective device for eyes, for example, goggles of a shield, includes a double lens member, a frame member and a face fixation member. The double lens member includes a front lens, a back lens and a gasket. The front lens and the back lens are made of polycarbonate resins, polyurethane resins, polyester resins or polyamide resins. The front lens and the back lens are disposed in parallel with the gasket therebetween in order to form a space surrounded with the front lens, the back lens and the gasket. This device is excellent in the antifogging property in the double lens.
1. A protective device for eyes comprising a double lens member, a frame member and a face fixation member, wherein
the double lens member includes a front lens, a back lens and a gasket;
the front lens and the back lens are made of any one of polycarbonate resins, polyurethane resins, polyester resins, and polyamide resins; and
the front lens and the back lens are disposed in parallel with the gasket therebetween to form a space surrounded with the front lens, the back lens and the gasket; and wherein
the gasket is made of a resin with a thickness of about 0.5 to 7 mm and a width of about 2 to 10 mm; and a back curve side of the front lens and a front curve side of the back lens are fixed via the gasket with a binding agent or adhesive agent.
2. The protective device for eyes according to claim 1 , wherein the front lens has any one of an aspheric shape, a spherical shape and a cylindrical shape, and is made thinner from a center toward a lens rim for a refraction collection.
3. The protective device for eyes according to claim 2 , wherein the back lens is made from any one of a lens sheet and a molded sheet with a thickness of 0.3 to 3 mm, and has any one of an aspheric shape, a spherical shape and a cylindrical shape approximately same as the front lens.
4. The protective device for eyes according to claim 1 , wherein
the front lens is made from any one of a lens sheet and a molded sheet with a thickness of 0.3 to 3 mm;
a back lens is made from a lens sheet with a thickness of 0.3 to 3 mm; and
the double lens member has a cylindrical shape.
5. The protective device for eyes according to claim 1 , wherein a back curve side of the back lens is treated with an antifogging agent.
6. The protective device for eyes according to claim 1 , wherein a resin sheet with antifogging properties having any one of an aspheric shape, a spherical shape and a cylindrical shape approximately same as the back lens is layered on a back curve side of the back lens.
7. The protective device for eyes according to claim 1 , wherein at least one pressure adjusting hole is provided at the back lens for a pressure adjustment of the space surrounded with the front lens, the back lens and the gasket.
8. The protective device for eyes according to claim 1 , wherein at least one pressure adjusting hole is provided at the gasket for a pressure adjustment of the space surrounded with the front lens, the back lens and the gasket.
9. The protective device for eyes according to claim 1 , wherein an air-permeable gasket is used for a pressure adjustment of the space surrounded with the front lens, the back lens and the gasket.
10. The protective device for eyes according to claim 7 , wherein the pressure adjusting hole is covered with a breathable member which is permeable to water vapor but impermeable to water.
11. The protective device for eyes according to claim 8 , wherein the pressure adjusting hole is covered with a breathable member which is permeable to water vapor but impermeable to water.
12. The protective device for eyes according to claim 9 , wherein the air-permeable gasket is covered with a breathable member which is permeable to water vapor but impermeable to water.