Patent US4882715A successfully refreshed from Google Patents.
US4882715A
Expired / Lapsed
US
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Surface acoustic wave convolver with dielectric film of high non-linear effect
Assignee: Canon Inc
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Filing: 1988-03-11
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Granted: 1989-11-21
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Expires: 2008-03-11
Abstract
Abstract In a surface acoustic wave elastic convolver capable of showing sufficiently high convolution efficiency with a simple structure, the convolver comprises a piezo-electric substrate, plural input transducers formed on the substrate for respectively generating surface acoustic waves corresponding to input signals, an output transducer for obtaining a convolution signal of the input signals, from a surface acoustic wave generated by non-linear interaction, of the surface acoustic waves generated by those input transducers, and a dielectric film of a non-linear effect larger than that of the substrate, formed on the substrate in at least an area where the output transducer is formed.
Inventors
- 👤 Koichi Egara
- 👤 Norihiro Mochizuki
- 👤 Kenji Nakamura
- 👤 Kazuo Yoshinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:50
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A surface acoustic wave elastic convolver comprising: a piezoelectric substrate; plural input transducers formed on said substrate, for respectively generating surface acoustic waves corresponding to input signals; an output transducer for obtaining a convolution signal of said input signals, from a surface acoustic wave generated by non-linear interaction, of the surface acoustic waves thus generated by said input transducers; and a dielectric film of a non-linear effect larger than that of said substrate, formed on said substrate in at least the area wherein said output transducer is formed.
Claim 2
Dependent Claim
88 words
A surface acoustic wave elastic convolver comprising: a piezoelectric substrate; plural input transducers formed on said substrate, for respectively generating surface acoustic waves corresponding to input signals; an output transducer for obtaining a convolution signal of said input signals, from a surface acoustic wave generated by non-linear interaction, of the surface acoustic waves thus generated by said input transducers; and a dielectric film of a non-linear effect larger than that of said substrate, formed on said substrate in at least the area wherein said output transducer is formed.
Claim 3
Dependent Claim
27 words
A surface acoustic wave elastic convolver according to claim 1, wherein said dielectric film is composed of a material selected from 2-methyl-4-nitroaniline, 3-methylnitropyridine-1-oxide, m-nitro-aniline and diacetylene polymer.
Claim 4
Dependent Claim
63 words
A surface acoustic wave elastic convolver according to claim 1, wherein said dielectric film is substantially composed of a compound in which an electron donating radical and an electron attracting radical or an electron donating radical are connected either directly or through an electron conjugating system, and a polymer mutually soluble with said compound, and said film is subjected to an orienting treatment.
Claim 5
Dependent Claim
27 words
A surface acoustic wave elastic convolver according to claim 3, wherein said electron donating radical is amino, alkyl, alkoxy, alkylamino, hydroxyalkylamino, dialkylamino, hydroxyalkyl-alkylamino, dihydroxyalkylamino or mercapto radical.
Claim 6
Dependent Claim
24 words
A surface acoustic wave elastic convolver according to claim 3, wherein said electron attracting radical is a nitro, cyano, halogeno, trifluoromethyl or carbonyl radical.
Claim 7
Dependent Claim
15 words
A surface acoustic wave elastic convolver according to claim 3, wherein said polymer is polyoxyalkylene.
Claim 8
Dependent Claim
18 words
A surface acoustic wave elastic convolver according to claim 1, wherein said substrate is composed of lithium niobate.
Claim 9
Dependent Claim
19 words
A surface acoustic wave elastic convolver according to claim 1, wherein said input transducers are composed of interdigital electrodes.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |