US4061816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrally sintered ceramic complex and method of manufacturing the same
Assignee: Sony Corp
•
Filing: 1976-03-23
•
Granted: 1977-12-06
•
Expires: 1996-03-23
Abstract
Abstract An integrally sintered ceramic complex which is suitable for use as a substrate of a surface acoustic wave device and can effectively reduce unnecessary ultrasonic waves. The method of manufacturing the integrally sintered ceramic complex is also disclosed. The disclosed ceramic complex comprises a first ceramic portion made of densely sintered piezoelectric ceramic material and a second ceramic portion made of porously sintered ceramic material. Both the ceramic portions are sintered integrally, and the second portion surrounds the first portion. The operating area of the surface acoustic wave device is formed on the surface of the first ceramic portion.
Inventors
- 👤 Tomosaburo Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02614; H03H9/02629; B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62675; C04B37/00; C04B37/001; G; G10; G10K; G10K11/00; G10K11/36; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3244; C04B2235/3248; C04B2235/3249; C04B2235/3262; C04B2235/3267; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/60; C04B2235/604; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/775; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/346; C04B2237/348; C04B2237/50; C04B2237/84; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
An integrally sintered ceramic complex, comprising: a first piezeoelectric ceramic portion; and a second ceramic portion; said first and second portions having a common external surface, said first and second ceramic portions being sintered integrally so that a boundary layer is formed between said first and second portions, the ratio of the theoretical density to the sintered density of said first ceramic portion being selected smaller than the same ratio of said second ceramic portion, and the ratio of the theoretical density to the sintered density in the boundary layer gradually increased from the ratio of said first portion to the ratio of said second portion so that ultrasonic waves propagating in said first piezeoelectric portion are effectively reduced in the boundary layer and said second portion.
Claim 2
Dependent Claim
127 words
An integrally sintered ceramic complex, comprising: a first piezeoelectric ceramic portion; and a second ceramic portion; said first and second portions having a common external surface, said first and second ceramic portions being sintered integrally so that a boundary layer is formed between said first and second portions, the ratio of the theoretical density to the sintered density of said first ceramic portion being selected smaller than the same ratio of said second ceramic portion, and the ratio of the theoretical density to the sintered density in the boundary layer gradually increased from the ratio of said first portion to the ratio of said second portion so that ultrasonic waves propagating in said first piezeoelectric portion are effectively reduced in the boundary layer and said second portion.
Claim 3
Dependent Claim
55 words
An integrally sintered ceramic complex according to claim 1 where said first ceramic portion is Pb(Cd 2/5 Nb 2/5 W 1/5 )x Tiy ZrzO 3 , where x is in the range of 0.01 to 0.2, y is in the range of 0.20 to 0.94 and z is in the range of 0.01 to 0.74.
Claim 4
Dependent Claim
25 words
An integrally sintered ceramic comlex according to claim 2 wherein 0.2 to 1.0 weight percent of MnO 2 is added to said first ceramic portion.
Claim 5
Dependent Claim
29 words
An integrally sintered complex according to claim 3 wherein said ceramic portion is Pb 0 .91 , La 0 .09 Ti 0 .35 Zr 0 .65 O 3 .
Claim 6
Dependent Claim
33 words
An integrally sintered complex according to claim 3 wherein said second ceramic portion is Pb (Cd 2/5 Nb 2/5 W 1/5 ) 0 .05 Ti 0 .525 Zr 0 .425 O 3 .
Claim 7
Dependent Claim
24 words
An integrally sintered complex according to claim 3 wherein said second ceramic portion is Pb (Zr 0 .5 Ti 0 .5) O 3 .
Claim 8
Dependent Claim
47 words
An integrally sintered ceramic complex as claimed in claim 1, in which the ceramic materials of said first and the second ceramic portions contain as their main element materials which can be diffused with each other through the boundary between said first and the second ceramic portions.
Claim 9
Dependent Claim
22 words
An integrally sintered ceramic complex as claimed in claim 1, in which said first portion is surrounded by said second ceramic portion.
Claim 10
Dependent Claim
24 words
An integrally sintered ceramic complex as claimed in claim 1, in which said second portion is positioned at both sides of said first portion.
References Cited (Backward Citations)
US3713877A
Cited
US3661781A
Cited
US3663440A
Cited
US3712846A
Cited
US3926702A
Cited
US3911188A
Cited
US3923675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |