Claims
- 1. An elastic wave device, comprising
a substrate of a piezo-electric element containing lithium niobate as a main component; and an electrode arranged on the substrate, the electrode being formed in a comb-like shape, and the electrode being made of conductive material having a prescribed thickness, characterized in that a surface of the substrate is set to a plane which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 55 degrees to 57 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (w/p), which is determined according to both a width w of each of a plurality of electrode fingers composing the electrode and an arrangement interval p of each pair of electrode fingers, is equal to or higher than 0.4 and is lower than 1.0 for each electrode finger.
- 2. An elastic wave device, comprising
a substrate of a piezo-electric element containing lithium niobate as a main component; and an electrode arranged on the substrate, the electrode being formed in a comb-like shape, and the electrode being made of conductive material having a prescribed thickness, characterized in that a surface of the substrate is set to a plane which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 57 degrees to 62 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (w/p), which is determined according to both a width w of each of a plurality of electrode fingers composing the electrode and an arrangement interval p of each pair of electrode fingers, is equal to or higher than 0.5 and is lower than 1.0 for each electrode finger.
- 3. An elastic wave device, comprising
a substrate of a piezo-electric element containing lithium niobate as a main component; and an electrode arranged on the substrate, the electrode being formed in a comb-like shape, and the electrode being made of conductive material having a prescribed thickness, characterized in that a surface of the substrate is set to a plane which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 62 degrees to 67 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (w/p), which is determined according to both a width w of each of a plurality of electrode fingers composing the electrode and an arrangement interval p of each pair of electrode fingers, is equal to or higher than 0.6 and is lower than 1.0 for each electrode finger.
- 4. An elastic wave device, comprising
a substrate of a piezo-electric element containing lithium niobate as a main component; and an electrode arranged on the substrate, the electrode being formed in a comb-like shape, and the electrode being made of conductive material having a prescribed thickness, characterized in that a surface of the substrate is set to a plane which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 67 degrees to 71 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (w/p), which is determined according to both a width w of each of a plurality of electrode fingers composing the electrode and an arrangement interval p of each pair of electrode fingers, is equal to or higher than 0.7 and is lower than 1.0 for each electrode finger.
- 5. An elastic wave device, comprising
a substrate of a piezo-electric element containing lithium niobate as a main component; and an electrode arranged on the substrate, the electrode being formed in a comb-like shape, and the electrode being made of conductive material having a prescribed thickness, characterized in that a surface of the substrate is set to a plane, which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 71 degrees to 76 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (w/p), which is determined according to both a width w of each of a plurality of electrode fingers composing the electrode and an arrangement interval p of each pair of electrode fingers, is equal to or higher than 0.8 and is lower than 1.0 for each electrode finger.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-203662 |
Jul 1999 |
JP |
|
CROSS-REFERENCE TO The RELATED APPLICATION
[0001] This application is a continuation of International Application No. PCT/JP00/04469, whose International filing date is Jul. 5, 2000, the disclosures of which Application are incorporated by reference herein.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/JP00/04469 |
Jul 2000 |
US |
Child |
09800929 |
Mar 2001 |
US |