Electroacoustic component

• US 8,247,955 B2
• Filed: 10/12/2007
• Issued: 08/21/2012
• Est. Priority Date: 10/16/2006
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Epcos AG (TDK Corporation)
• Inventors: Roesler, Ulrike, Riha, Evelyn, Ruile, Werner
• Primary Examiner(s): Benson, Walter
• Assistant Examiner(s): Gordon, Bryan
• Application Number:
  US12/445,507
• Publication Number:
  US 20100109485A1
• Time in Patent Office: 1,775 Days
• Field of Search: 310/313.A, 310/313.B, 310/313.C, 310/313.D, 310/361
• US Class Current: 310/361
• CPC Class Codes: H03H 9/02551 of quartz substrates

Abstract

An electroacoustic component includes a substrate that includes a quartz single crystal. The quartz single crystal has a first Euler angle λ: −5°≦λ≦5°, a second Euler angle μ, and a third Euler angle θ. A contiguous region of the quartz single crystal has the following vertices P_i(μ_i, θ_i): (23°, 20°), (60°, 17°), (110°, 30°), (105°, 42°), (60°, 30°), (23°, 25°).

Claims

1. An electroacoustic component comprising:

a substrate comprising a quartz single crystal, the quartz single crystal having a first Euler angle λ

, second Euler angle μ

, and third Euler angle θ

, the first, second and third Euler angles being in the following ranges;

28°

≦

λ

≦

32°

, |μ

−

90°

|>

5°

, and 135°

≦

θ

≦

160°

.

2. The electroacoustic component of claim 1, wherein:

20°

<

|μ

−

90°

|<

55°

.

3. The electroacoustic component of claim 1, wherein:

λ

=30°

, 25°

<

|μ

−

90°

|<

34° and

146°

≦

θ

≦

153°

.

4. An electroacoustic component comprising:

a substrate comprising a quartz single crystal, the quartz single crystal having a first Euler angle λ

;

5°

≦

λ

≦

28°

, a second Euler angle μ

;

40°

<

μ

≦

140°

, and a third Euler angle θ

;

135°

≦

θ

≦

160°

.

5. The electroacoustic component of claim 4, wherein:

7°

≦

λ

≦

13°

, 122°

≦

μ

≦

128° and

137°

≦

θ

≦

143°

.

6. The electroacoustic component of claim 4, wherein:

5°

≦

λ

≦

28°

, 60°

≦

μ

≦

75° and

147°

≦

θ

≦

160°

.

7. The electroacoustic component of claim 6, wherein:

14°

≦

λ

≦

21°

.

8. The electroacoustic component of claim 4, further comprising:

electrodes, on the substrate, for exciting an acoustic wave having a wavelength λ

₀.

9. The electroacoustic component of claim 8, wherein the electrodes comprise metallic aluminum.

10. The electroacoustic component of claim 9, wherein a weight proportion of aluminum in the electrodes is at least 80%.

11. The electroacoustic component of claim 8, wherein a height of the electrodes relative to the wavelength is at most 2.5%;

and

wherein an acoustic reflection at the electrodes is at least 1%.

12. The electroacoustic component of claim 8, wherein a height of the electrodes relative to the wavelength is at most 4%.

13. The electroacoustic component of claim 4, wherein a magnitude of a quadratic temperature coefficient associated with the electroacoustic component does not exceed 2×

10<sup>−

8</sup>/K².

14. The electroacoustic component of claim 4, comprising a resonator comprising a transducer in which an acoustic wave is excitable electrically.