Surface acoustic wave device having a package including a conductive cap that is coated with sealing material

• US 6,437,412 B1
• Filed: 06/12/2000
• Issued: 08/20/2002
• Est. Priority Date: 06/17/1999
• Status: Expired due to Fees

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kanryo, Koichi, Higuchi, Masato, Uesugi, Shinobu, Hirakawa, Atsushi
• Primary Examiner(s): Christianson, Keith
• Assistant Examiner(s): Smoot, Stephen W.
• Application Number:
  US09/592,517
• Time in Patent Office: 799 Days
• Field of Search: 257/678, 257/704, 257/416, 310/313.R
• US Class Current: 257/416
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/16195 Flat cap [not enclosing an internal cavity]
• CPC Class Codes: H03H 9/1071 the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the SAW device

Abstract

A surface acoustic wave device includes a surface acoustic wave element and a package. The package has a base member and a conductive cap member which are joined together by a sealing material so as to hermetically seal the surface acoustic wave element therein. The conductive cap member is coated with the sealing material on the entire surface thereof that is disposed opposite to the base member.

Claims

1. A surface acoustic wave device comprising:

a surface acoustic wave element; and

a package arranged to hermetically seal the surface acoustic wave element therein, the package having a base member and a conductive cap member;

a sealing material arranged to join the conductive cap member and the base member;

wherein the conductive cap member is coated with the sealing material on the entire surface thereof that is disposed opposite to the base member such that the base member does not directly contact the conductive cap member.

2. A surface acoustic wave device according to claim 1, wherein the sealing material is a resin adhesive.

3. A surface acoustic wave device according to claim 1, wherein the base member has a substantially concave shape.

4. A surface acoustic wave device according to claim 1, wherein the base member is made of a ceramic material.

5. A surface acoustic wave device according to claim 1, wherein the cap member is a plate-shaped metallic member.

6. A surface acoustic wave device according to claim 1, wherein the surface acoustic wave element is one of a surface acoustic resonator, a surface acoustic filter, and a surface acoustic delay line.

7. A surface acoustic wave device according to claim 1, wherein the sealing material includes one of acryl, urethane, silicon, metal and glass.

8. A surface acoustic wave device according to claim 1, wherein the base member is made of one of a resin and a metal.

9. A surface acoustic wave device according to claim 1, wherein a joining interface between the base member and the cap member is not exposed in the package.

10. A surface acoustic wave device according to claim 1, wherein the surface acoustic wave element is fixed and electrically connected to the base member.