ELECTROACOUSTIC COMPONENT

• US 20100109485A1
• Filed: 10/12/2007
• Published: 05/06/2010
• Est. Priority Date: 10/16/2006
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Epcos AG (TDK Corporation)
• Inventors: Riha, Evelyn, Ruile, Werner, Roesler, Ulrike
• Granted Patent: US 8,247,955 B2
• Time in Patent Office: Days
• 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

;

−

5°

≦

λ

≦

28°

, a second Euler angle μ

, and a third Euler angle θ

;

wherein 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°

).

20. The electroacoustic component of claim 1, wherein:

−

0.5°

≦

λ

≦

2.5°

.

21. The electroacoustic component of claim 1, wherein:

102°

≦

μ

≦

108° and

34.25°

≦

θ

≦

40.25°

.

2. 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

;

20°

≦

μ

≦

110°

, a third Euler angle θ

;

15°

≦

θ

≦

45°

.

3. The electroacoustic component of claim 2, wherein:

−

0.5°

≦

λ

≦

2.5°

.

4. The electroacoustic component of claim 2, wherein:

102°

≦

μ

≦

1088° and

34.25 °

≦

θ

≦

40.25°

.

13. The electroacoustic component of claim 2, further comprising:

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

₀.

14. The electroacoustic component of claim 13, wherein the electrodes comprise metallic aluminum.

15. The electroacoustic component of claim 14, wherein a weight proportion of aluminum in the electrodes is at least 80%.

16. The electroacoustic component of claim 13, 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%.

17. The electroacoustic component of claim 13, wherein a height of the electrodes relative to the wavelength is at most 4%.

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

10<sup>−

8</sup>/K².

19. The electroacoustic component of claim 2, comprising a resonator comprising a transducer in which an acoustic wave is excitable electrically.

5. 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°

.

6. The electroacoustic component of claim 5, wherein:

20°

>

|μ

−

90°

|>

55°

.

7. The electroacoustic component of claim 5, wherein:

λ

=30°

, 25°

<

|μ

−

90°

|<

34° and

146°

≦

θ

≦

153°

.

8. An electroacoustic component comprising:

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

;

−

5°

≦

λ

≦

28°

, a second Euler angle μ

;

20°

≦

μ

≦

110°

, and a third Euler angle θ

;

10°

≦

θ

≦

45°

.

9. 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°

.

10. The electroacoustic component of claim 9, wherein:

7°

≦

λ

≦

13°

, 122°

≦

μ

≦

128° and

137°

≦

θ

≦

143°

.

11. The electroacoustic component of claim 9, wherein:

5°

≦

λ

≦

28°

, 60°

≦

μ

≦

75° and

147°

≦

θ

≦

160°

.

12. The electroacoustic component of claim 11, wherein:

−

14°

≦

λ

≦

21°

.