Method of producing pyro-electric and piezo-electric elements
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsShoji Ichihara, Iwao Seo
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Abstract
This invention relates to a method of manufacturing pyroelectricity and piezoelectricity elements consisting of a very thin film of polyvinylidene fluoride or a copolymer of polyvinylidene fluoride less than 7 micron thickness which is stretched while in close contact with a laminating resin which has a low adherence to said film so that said film can be stretched very thin as stated above.
Claims38
A method of manufacturing pyroelectric and piezoelectric elements in which at least one surface of a film of a polyvinylidene fluoride or copolymer of polyvinylidene fluoride is in close contact with a laminating resin having a breaking point for stretching equal to or greater than that of the polyvinylidene fluoride or copolymer of vinylidene fluoride and comprising a close contact laminated assembly, said close contact laminated assembly being stretched more than 3 times the thickness at least uniaxially at a temperature selected between 0.degree. to 130.degree. C. whereby the thickness of the stretched polyvinylidene fluoride or copolymer of polyvinydiene fluoride is less than 7 micron, and then polarizing said stretched film.
A method of manufacturing pyroelectric and piezoelectric elements in which at least one surface of a film of polyvinylidene fluoride of copolymer of vinylidene fluoride is in close contact with a laminating resin having breaking point for stretching equal to or greater than that of the polyvinylidene fluoride or copolymer of vinylidene fluoride and comprises a close contact laminated assembly, said close contact laminated assembly being stretched more than 3 times the thickness at least in a uniaxial direction at a temperature range of 0.degree. to 130.degree. C. so that the thickness of polyvinylidene fluoride or copolymer of vinylidene fluoride after stretching is less than 7 micron, including the steps of:
- (a) heat treating the film at a temperature between the melting point (Tm) of polyvinylidene fluoride or copolymer of vinylidene fluoride and 70.degree. C. lower than Tm;
- (b) attaching an electrode on one face of the film of stretched polyvinylidene fluoride or copolymer of vinylidene fluoride;
- attaching a backing on the electrode, separating the laminated resin from the film;
- attaching an electrode on the other face of the polyvinylidene fluoride or copolymer of vinylidene flouride film and polarizing said film.
A method of manufacturing pyroelectric or piezoelectric elements comprising laminating a film selected from the group consisting of a polyvinylidene fluoride or copolymer of polyvinylidene fluoride to a resin having a breaking point for stretching equal to or greater than said film;
- stretching said resin and said laminating film assembly at least in a uniaxial direction to a stretching ratio greater than 3 at a temperature range of approximately 0.degree. to 130.degree. C.;
- so that the thickness of said film is less than about 7 microns;
- and polarizing said stretched film.
A method of manufacturing pyroelectric and piezoelectric elements comprising laminating a film selected from the group consisting of a polyvinylidene flouride or a compolymer of vinylidene fluoride to a resin having a breaking point for stretching equal to or greater than said film;
- stretching said resin and laminated assembly at a stretching ratio greater than 3 in at least a uniaxial direction at a temperature range between 0.degree. and 130.degree. C. so that the thickness of the film after stretching is less than 7 microns;
- heat treating the film at a temperature between its melting point and 70.degree. below its melting point;
- attaching an electrode on one face of the stretched film;
- attaching a backing on said electrode;
- separating the resin from the film;
- attaching an electrode on the other face of the stretched film;
- and polarizing said film.
Dependencies are inferred from the claim text.