US4302408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pyro-electric and piezo-electric elements
Assignee: Mitsubishi Chemical Corp
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Filing: 1980-04-07
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Granted: 1981-11-24
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Expires: 2000-04-07
Abstract
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.
Inventors
- 👤 Shoji Ichihara
- 👤 Iwao Seo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
H; H10; H10N; H10N15/00; H10N15/10; H10N30/00; H10N30/01; H10N30/04; H10N30/045; H10N30/09; H10N30/098; H10N30/80; H10N30/85; H10N30/857; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
111 words
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° to 130° 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.
Claim 2
Independent Claim
111 words
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° to 130° 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.
Claim 3
Dependent Claim
25 words
A method of manufacturing pyroelectric and piezo electric elements as claimed in claim 1, in which said stretching is performed uniaxially at least 3.5 times.
Claim 4
Dependent Claim
33 words
A method of manufacturing a pyroelectric and piezoelectric element as claimed in claim 1 in which said close contact laminated assembly is stretched in biaxial directions at a draw ratio greater than 13.
Claim 5
Dependent Claim
27 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1, in which said stretching is performed in the range of 15° to 90° C.
Claim 6
Dependent Claim
29 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1, in which the stretched polyvinylidene fluoride or copolymer of vinylydene fluoride is heat treated after stretched.
Claim 7
Dependent Claim
43 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1, in which a stretched film of polyvinylidene fluoride or copolymer of polyvinylidene fluoride is treated thermally at a temperature between their melting point and 70° C. below their melting point.
Claim 8
Dependent Claim
28 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 6, in which the laminating resin has a melting point greater than the heat treating temperature.
Claim 9
Dependent Claim
25 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1 or 6, in which the laminating resin is a polypropylene or polyamide.
Claim 10
Dependent Claim
33 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1, in which said laminating resin is laminated at thickness such that the thickness after stretching is more than 2 micron.
Claim 11
Dependent Claim
35 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 1, in which said laminating resin is laminated at a thickness such that the thickness after stretching is between 10 and 30 micron.
Claim 12
Independent Claim
191 words
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° to 130° 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° 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.
Claim 13
Independent Claim
191 words
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° to 130° 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° 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.
Claim 14
Dependent Claim
25 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, in which step (a) is performed first, then step (b) is performed.
Claim 15
Dependent Claim
25 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, in which step (b) is performed first, then step (a) is performed.
Claim 16
Dependent Claim
29 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, in which the polarizing in step (b) and heat treatment of step (a) are performed simultaneously.
Claim 17
Dependent Claim
33 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which said stretching is performed in a uniaxial direction at a ratio of more than 3.5.
Claim 18
Dependent Claim
33 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which said stretching is performed in a biaxial directions at a stretch magnification greater than 13.
Claim 19
Dependent Claim
30 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which said stretching is performed at a temperature between 15° to 90° C.
Claim 20
Dependent Claim
31 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which the laminating resin has a melting point greater than the heat treating temperature.
Claim 21
Dependent Claim
37 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which said laminating resin is laminated at a thickness such that the thickness after stretching is greater than 2 microns.
Claim 22
Dependent Claim
38 words
A method of manufacturing pyroelectric and piezoelectric elements as claimed in claim 11, 12 or 13 in which said laminating resin is laminated at a thickness such that the thickness after stretching is between 10 and 30 microns.
Claim 23
Independent Claim
91 words
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° to 130° C.; so that the thickness of said film is less than about 7 microns; and polarizing said stretched film.
Claim 24
Independent Claim
91 words
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° to 130° C.; so that the thickness of said film is less than about 7 microns; and polarizing said stretched film.
Claim 25
Dependent Claim
16 words
The method according to claim 21 in which said stretching ratio is greater than about 3.5.
Claim 26
Dependent Claim
25 words
The method according to claim 21 in which said resin and said laminated film assembly is stretched biaxially at a draw ratio greater than 13.
Claim 27
Dependent Claim
21 words
The method according to claim 21 in which said stretching is performed in a temperature range of 15° to 90° C.
Claim 28
Dependent Claim
34 words
The method according to claim 21 including the step of heating said stretched film at a temperature between the melting point of said film and 70° C. below the melting point of said film.
Claim 29
Dependent Claim
18 words
The method according to claim 25 in which said resin has a melting point greater than said film.
Claim 30
Dependent Claim
22 words
The method according to claim 21 or 26 in which said resin is selected from the group consisting of polypropylene or polyamide.
Claim 31
Dependent Claim
27 words
The method according to claim 21 in which the thickness of the resin before stretching is selected to produce a thickness after stretching greater than 2 microns.
Claim 32
Dependent Claim
29 words
The method according to claim 1 in which the thickness of the resin before stretching is selected to produce a thickness after stretching of between 10 to 30 microns.
Claim 33
Independent Claim
139 words
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° and 130° 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° 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.
Claim 34
Independent Claim
139 words
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° and 130° 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° 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.
Claim 35
Dependent Claim
19 words
The method according to claim 30 in which said heat treating step is performed after said electrodes are attached.
Claim 36
Dependent Claim
19 words
The method according to claim 30 or 31 in which said heat treatment and polarizing steps are performed simultaneously.
Claim 37
Dependent Claim
18 words
The method according to claim 30 or 31 in which said stretching ratio is greater than about 3.5.
Claim 38
Dependent Claim
28 words
The method according to claim 30 or 31 in which said resin and laminated film assembly is stretched in biaxial directions at a stretch magnification greater than 13.
Claim 39
Dependent Claim
24 words
The method according to claim 30 or 31 in which said stretching is performed between a temperature range of about 15° to 90° C.
Claim 40
Dependent Claim
20 words
The method according to claim 30 or 31 in which said resin has a melting point greater than said film.
Claim 41
Dependent Claim
28 words
The method according to claim 30 or 31 in which the thickness of said resin is selected to produce a thickness after stretching of greater than 2 microns.
Claim 42
Dependent Claim
29 words
The method according to claim 30 or 31 in which the thickness of said resin is selected to produce a thickness after stretching of between 10 and 30 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |