US3885301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyroelectric element of polymer film
Assignee: Kureha Corp
•
Filing: 1972-11-09
•
Granted: 1975-05-27
•
Expires: 1992-11-09
Abstract
Abstract A pyroelectric element comprising a polymer film which can be converted into pyroelectric substance, the polymer film having a pyroelectric distribution along its surface. The process of producing such a film comprising: POLING DESIRED LOCAL PORTIONS OF THE FILM WHILE VARYING EITHER THE TEMPERATURE AND/OR THE ELECTRIC POTENTIAL OF LOCALIZED AREAS OF THE FILM; A FURTHER PROCESS OF PRODUCING SUCH A PYROELECTRIC ELEMENT WHEREIN A DEFINITE PYROELECTRICITY IS PROVIDED TO THE SURFACE OF THE POLYMER FILM AND THEN A NON-UNIFORM DISTRIBUTION OF PYROELECTRICITY IS PROVIDED BY LOCALLY REDUCING OR ELIMINATING THE PYROELECTRICITY; A PROCESS OF STORING AND REPRODUCING SIGNALS IN SUCH A PYROELECTRIC ELEMENT COMPRISING: STORING POLARIZATION SIGNALS OF DIFFERENT PYROELECTRICITIES IN DIFFERENT PORTIONS OF SUCH AN ELEMENT, AND THEN DELIVERING THE SIGNALS AS A POLARIZATION CHANGE DUE TO A TEMPERATURE CHANGE.
Inventors
- 👤 Naohiro Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:02
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/0002; G11C13/0009; G11C13/0014; G11C13/0016; B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; B82; B82Y; B82Y10/00; G01; G01J; G01J5/00; G01J5/10; G01J5/34; G01K; G01K7/00; G01K7/003; G03; G03G; G03G15/00; G03G15/056; G11C13/02; G11C17/00; G11C17/005; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A PROCESS OF PRODUCING A PYROELECTRIC ELEMENT HAVING A NONUNIFORM DISTRIBUTION OF PYROELECTRICITY ALONG THE SURFACE THEREOF, WHICH COMPRISES POLARIZING DESIRED LOCAL PORTIONS OF A POLYMER FILM, WHICH CAN BE CONVERTED INTO A PYROELECTRIC SUBSTANCE BY APPLYING AN ELECTRIC POTENTIAL TO SAID FILM, WHILE VARYING AT LEAST ONE OF THE TEMPERATURE AND THE ELECTRIC POTENTIAL AT EACH OF THE LOCAL PORTIONS RELATIVE TO OTHER PORTIONS OF THE FILM.
Claim 2
Dependent Claim
68 words
A PROCESS OF PRODUCING A PYROELECTRIC ELEMENT HAVING A NONUNIFORM DISTRIBUTION OF PYROELECTRICITY ALONG THE SURFACE THEREOF, WHICH COMPRISES POLARIZING DESIRED LOCAL PORTIONS OF A POLYMER FILM, WHICH CAN BE CONVERTED INTO A PYROELECTRIC SUBSTANCE BY APPLYING AN ELECTRIC POTENTIAL TO SAID FILM, WHILE VARYING AT LEAST ONE OF THE TEMPERATURE AND THE ELECTRIC POTENTIAL AT EACH OF THE LOCAL PORTIONS RELATIVE TO OTHER PORTIONS OF THE FILM.
Claim 3
Dependent Claim
43 words
The process of producing a pyroelectric element as claimed in claim 1 wherein said polarizing of the local portions is conducted under a constant temperature while varying the electric potention at each of the local portions relative to other portions of the film.
Claim 4
Dependent Claim
53 words
The process of claim 2, wherein said temperature is above room temperature and said electric potential is varied by placing a plurality of pairs of stationary electrodes so that the members of said pairs are on opposite surfaces of said film at each local portion and applying to each pair an electric potential.
Claim 5
Dependent Claim
17 words
The process of claim 3, wherein a different electric potential is applied to each pair of electrodes.
Claim 6
Dependent Claim
43 words
The process of claim 3, wherein the electric potential is a d.c. potential of from 30 kv/cm up to a value lower than the endurable potential of the polymer film, and said temperature is between 40*C and the melting point of said film.
Claim 7
Dependent Claim
45 words
The process of claim 2, wherein said temperature is above room temperature and said electric potential is varied by positioning said film between at least one pair of electrodes and moving said film relative to said electrodes while applying an electric field to said electrode.
Claim 8
Dependent Claim
43 words
The process of producing a pyroelectric element as claimed in claim 1, wherein said polarizing of the local portions is conducted under a constant electric potential while varying the temperature at each of the local portions relative to other portions of the film.
Claim 9
Dependent Claim
39 words
The process of claim 1, wherein said electric potential is varied by placing a pair of stationary electrodes at each local portion, applying to each pair an electric potential, and varying the temperature at each of the local portions.
Claim 10
Dependent Claim
39 words
The process of claim 1, wherein said polymer is chosen from the group consisting of a polyvinylidene fluoride series resin composition, a polyvinyl fluoride series resin composition, and a dispersion of a pyroelectric inorganic crystal powder in a polymer.
Claim 11
Dependent Claim
15 words
The process of claim 9, wherein said polymer is a polyvinylidene fluoride series resin composition.
Claim 12
Dependent Claim
71 words
A process of producing a pyrolectric element having a non-uniform distribution of pyroelectricity along the surface thereof, which comprises providing a definite pyroelectricity to the whole surface or a part of the surface of a polymer film, which can be converted into a pyroelectric substance by applying an electric potential to said film, and then locally reducing or eliminating the pyroelectricity of the film to provide a non-uniform distribution of pyroelectricity.
Claim 13
Dependent Claim
71 words
A process of producing a pyrolectric element having a non-uniform distribution of pyroelectricity along the surface thereof, which comprises providing a definite pyroelectricity to the whole surface or a part of the surface of a polymer film, which can be converted into a pyroelectric substance by applying an electric potential to said film, and then locally reducing or eliminating the pyroelectricity of the film to provide a non-uniform distribution of pyroelectricity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |