JP2009128272A - Piezoelectric device and electronic apparatus using the same, and automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the electrical reliability of a piezoelectric device in which lead wires support a piezoelectric vibrator. <P>SOLUTION: This piezoelectric device is provided with connection parts 16A, 16B for connecting at least part of a portion to which the piezoelectric vibrator 14 is hollow-held by the other ends of the first and second lead wires 12A, 12B, 13A, 13B and which does not contact a circuit pattern and the piezoelectric vibrator 14 at the first lead wires 12A, 12B, and at least part of a portion which does not contact a circuit pattern and the piezoelectric vibrator 14 at the second lead wires 13A, 13B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a piezoelectric device used for an electronic device such as a digital camera or a sensing function of an automobile.

  Conventionally, as shown in FIG. 9, this type of piezoelectric device includes a lead wire 1 whose one end is electrically connected to a circuit pattern disposed on the bottom surface 4 </ b> A of the outer container 4, and the other end of the lead wire 1. A piezoelectric vibrator 2 having a terminal 2A electrically connected to the lead wire 1, the piezoelectric vibrator 2 being held hollow by the other end of the lead wire 1, and a back surface of a portion in contact with the circuit pattern at one end of the lead wire 1 That is, the support substrate 3 is provided on the upper surface.

As prior art document information relating to this application, for example, Patent Document 1 is known.
JP 2007-167854 A

  Such a conventional piezoelectric device has a problem of low electrical reliability.

  That is, in the conventional configuration described above, it is desired to adjust the piezoelectric vibrator 2 so as to be arranged in parallel with the outer container 4 for the purpose of high accuracy as a device. By adjusting the shape of the lead wire 1 by applying a force such as pushing or pulling to the movable portion of the lead wire 1, that is, the portion of the circuit pattern and the portion 1 A not in contact with the piezoelectric vibrator 2. A method of adjusting the vibrator 2 so as to be arranged in parallel to the outer container 4 can be considered.

  However, if an attempt is made to make such adjustment, the force applied to the portion 1A of the lead wire 1 is directly applied to the connection point between the other end of the lead wire 1 and the terminal 2A of the piezoelectric vibrator 2, so that electrical Electrical reliability has been lowered due to poor connection.

  Accordingly, an object of the present invention is to improve the electrical reliability of a piezoelectric device in which a lead wire supports a piezoelectric vibrator.

  In order to achieve this object, according to the present invention, the piezoelectric vibrator is held hollow by the other ends of the first and second lead wires, and the circuit pattern and the piezoelectric vibrator are connected to the first lead wire. A connection portion is provided to connect at least a part of the part that is not in contact with at least a part of the part of the second lead wire that is not in contact with the circuit pattern and the piezoelectric vibrator. .

  The piezoelectric device of the present invention is movable in the first lead wire or the second lead wire when adjusting the piezoelectric vibrator to be arranged in parallel to the outer container for the purpose of improving the accuracy of the device. Even when a force such as pushing or pulling is applied to a part, that is, a part of the part not in contact with the circuit pattern and the piezoelectric vibrator, the circuit pattern and the piezoelectric vibration are applied to the first and second lead wires. Since the connecting portion that connects at least part of the portion that is not in contact with the child disperses the force in the two lead wires, the connection point between the first lead wire or the second lead wire and the terminal of the piezoelectric vibrator As a result, the electrical reliability can be improved.

(Embodiment 1)
Hereinafter, the piezoelectric device according to the first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the piezoelectric device according to the present embodiment has first lead wires 12A, 12B, and second leads, one end of which is electrically connected to a circuit pattern disposed on the bottom surface 11A of the outer container 11. And a piezoelectric vibrator 14 having a terminal 14A electrically connected to the other ends of the first and second lead wires 12A, 12B, 13A, and 13B, as shown in FIG. The vibrator 14 is configured to be held hollow by the other ends of the first and second lead wires 12A, 12B, 13A, and 13B.

  Specifically, one end of the lead wires 12A, 12B, 13A, 13B is placed on the bottom surface 11A of the outer container 11 such as a ceramic package. An IC for driving the piezoelectric device and detecting a signal from the piezoelectric device and a circuit pattern electrically connected to the IC are formed on the bottom surface 11A. One end of the lead wires 12A, 12B, 13A, 13B is electrically connected to this circuit pattern, and the other end of the first and second lead wires 12A, 12B, 13A, 13B is electrically connected to the terminal 14A of the piezoelectric vibrator 14. Connected. The circuit pattern can be configured with a TAB (Tape Automated Bonding) substrate to form a lower-profile piezoelectric device.

  As shown in FIGS. 1 and 2, at least a part of the first lead wires 12A and 12B that are not in contact with the circuit pattern and the piezoelectric vibrator 14, and the second lead wires 13A and 13B have a circuit pattern and Connecting portions 16A and 16B are provided for connecting at least a part of the portion not in contact with the piezoelectric vibrator.

  With such a configuration, the first lead wires 12A, 12B, or the second lead wires 12A, 12B, or Even when a force such as pushing or pulling is applied to a part of the lead wires 13A and 13B that is not in contact with the movable portion, that is, the circuit pattern and the piezoelectric vibrator 14, the first lead wire 12A ( Alternatively, the connecting portion 16A (or 16B) that connects at least a portion of the circuit pattern and the portion not in contact with the piezoelectric vibrator 14 in the second lead wire 13A (or 13B) 12B) and the second lead wire 13A (or 13B) generates the first and second forces. Of the first lead wire 12A (or 12B) or the second lead wire 12A, 13A (or 12B, 13B). A word line 13A (or 13B) can reduce the force applied to the connection point between the terminals 14A of the piezoelectric vibrator 14, as a result, it is possible to improve the electrical reliability.

  In the present embodiment, as shown in FIG. 2, the connection surface 17 with the piezoelectric vibrator 14 at the other end of the first and second lead wires 12 </ b> A, 12 </ b> B, 13 </ b> A, 13 </ b> B is the bottom surface of the outer container 11. 11A, i.e., the first and second lead wires 12A, 12B, 13A, and 13B are placed on the mounting surface on which one end is placed and the back surface of the opposite surface. , 12B, 13A, and 13B, the surface facing the mounting surface may be used as a connection surface with the piezoelectric vibrator 14.

  However, as shown in FIG. 2, the connection surface 17 with the piezoelectric vibrator 14 at the other end of the first and second lead wires 12A, 12B, 13A, 13B is the back surface of the surface facing the mounting surface. By adopting the configuration, the shape of the piezoelectric vibrator 13 is not restricted by the presence of the first and second lead wires 12A, 12B, 13A, and 13B, so that the degree of design freedom is desirable.

  The shape of the piezoelectric vibrator 14 shown in FIG. 1 may be a tuning fork type as shown in FIG. 3, and, as shown in FIG. 4, six leg portions 14C with respect to one base portion 14B. It does not matter even if it has composition which has.

  As shown in FIG. 5, the upper surface of one end of the first and second lead wires 12 </ b> A, 12 </ b> B, 13 </ b> A, 13 </ b> B may be supported by the support substrate 15.

  In addition, by mounting a piezoelectric device with high electrical reliability as shown in this embodiment on an electronic device such as a digital camera or an automobile, an electronic device or an automobile that can perform more reliable sensing. Can be realized.

  Specifically, by mounting the piezoelectric device shown in the present embodiment as a mobile phone or vehicle-mounted navigation sensor, a vehicle control system sensor, a camera shake correction sensor, etc., electrical problems may be caused. An electronic device or an automobile that is less likely to occur and can perform more reliable sensing can be realized.

(Embodiment 2)
Hereinafter, a piezoelectric device according to Embodiment 2 of the present invention will be described with reference to the drawings.

  As shown in FIG. 6, the piezoelectric device according to the present embodiment is made of a ceramic package or the like, and includes an outer container 21 having a recess 21 </ b> B on the bottom surface 21 </ b> A, and a first end mounted on the bottom surface 21 </ b> A of the outer container 21. 1 lead wires 22A, 22B and second lead wires 23A, 23B, and the other ends of the first and second lead wires 22A, 22B, 23A, 23B are in the recess 21B as shown in FIG. A terminal 24A of the piezoelectric vibrator 24 is connected to the other ends of the first and second lead wires 22A, 22B, 23A, and 23B.

  Here, although not shown in the drawing, the piezoelectric device is driven on the bottom surface 21A or the bottom surface 21C of the recess 21B and a signal is detected from the piezoelectric device, and a circuit electrically connected to the IC. One end of each of the first and second lead wires 22A, 22B, 23A, and 23B is electrically connected to the circuit pattern, and the first and second lead wires 22A, 22B, 23A, The other end of 23B is electrically connected to the terminal 24A of the piezoelectric vibrator 24. The circuit pattern can be configured with a TAB (Tape Automated Bonding) substrate to form a lower-profile piezoelectric device.

  As shown in FIG. 6, at least a part of the first lead wires 22A and 22B that are not in contact with the circuit pattern and the piezoelectric vibrator 24 and the second lead wires 23A and 23B have a circuit pattern and the piezoelectric vibrator. Connecting portions 26A and 26B are provided to connect at least a part of the portion not in contact with the contact portion 26A.

  With such a configuration, when the piezoelectric vibrator 24 is adjusted to be arranged in parallel with the outer container 21 for the purpose of high accuracy as a device, the first lead wires 22A and 22B or the second lead wires 22A and 22B Even when a force such as pushing or pulling is applied to a part of the lead wires 23A and 23B that is not in contact with the movable portion, that is, the circuit pattern and the piezoelectric vibrator 24, the first lead wire 22A ( Alternatively, the connecting portion 26A (or 26B) that connects at least a part of the circuit pattern and the portion not in contact with the piezoelectric vibrator 24 in the second lead wire 23A (or 23B) has the force of the first and second Of the first lead wire 22A (or 22B) or second lead wire 22A, 23A (or 22B, 23B). A word line 23A (or 23B) can reduce the force applied to the connection point between the terminals 24A of the piezoelectric vibrator 24, as a result, it is possible to improve the electrical reliability.

  In the present embodiment, as shown in FIG. 7, the connection surface 27 with the piezoelectric vibrator 24 at the other end of the first and second lead wires 22A, 22B, 23A, and 23B is a concave portion of the outer container 21. 21B is configured to be a surface facing the inner side of the first lead wire 22A, 22B, 23A, 23B, and the other end of the first and second lead wires 22A, 22B, 23A, 23B. The vibrator 24 may be formed and a support member may be formed on the surface of the outer container 21 facing the inner side of the recess 21B.

  However, as shown in FIG. 7, the connection surface 27 with the piezoelectric vibrator 24 at the other end of the first and second lead wires 22 </ b> A, 22 </ b> B, 23 </ b> A, 23 </ b> B faces the inner side of the recess 21 </ b> B of the outer container 21. With this configuration, it is desirable that the shape of the piezoelectric vibrator 24 is not restricted by the presence of the first and second lead wires 22A, 22B, 23A, and 23B, and the degree of freedom in design is widened.

  The shape of the piezoelectric vibrator 23 may be a tuning fork type, or may have a configuration having a plurality of legs with respect to one base.

  As shown in FIG. 8, the upper surface of one end of the first and second lead wires 22A, 22B, 23A, and 23B may be supported by the support substrate 25.

  Further, as shown in FIG. 7, the arrangement of the connecting portion 26B is not limited to a configuration in which it is bent from one end of the first and second lead wires 22A, 22B, 23A, 23B and then provided in the middle of the recess 21B. First, if the first and second lead wires 22A, 22B, 23A, and 23B are portions not in contact with the circuit pattern and the piezoelectric vibrator 24, the first and second lead wires 22A as shown in FIG. , 22B, 23A, 23B may be provided before bending from one end.

  In addition, by mounting a piezoelectric device with high electrical reliability as shown in this embodiment on an electronic device such as a digital camera or an automobile, an electronic device or an automobile that can perform more reliable sensing. Can be realized.

  Specifically, by mounting the piezoelectric device shown in the present embodiment as a mobile phone or vehicle-mounted navigation sensor, a vehicle control system sensor, a camera shake correction sensor, etc., electrical problems may be caused. An electronic device or an automobile that is less likely to occur and can perform more reliable sensing can be realized.

  The piezoelectric device of the present invention has high electrical reliability and is useful in automobiles and various electronic devices.

Top view of the piezoelectric device according to Embodiment 1 of the present invention A-AA sectional view of FIG. The top view which shows the other Example of the piezoelectric device in Embodiment 1 of this invention. The top view which shows the other Example of the piezoelectric device in Embodiment 1 of this invention. Sectional drawing which shows the other Example of the piezoelectric device in Embodiment 1 of this invention Top view of the piezoelectric device according to the second embodiment of the present invention B-BB sectional view of FIG. Sectional drawing which shows the other Example of the piezoelectric device in Embodiment 2 of this invention. Cross-sectional view of a conventional piezoelectric device

Explanation of symbols

12A, 12B First lead wire 13A, 13B Second lead wire 14 Piezoelectric vibrator 14A Terminal 16A, 16B Connecting portion

Claims (6)

First and second lead wires whose one ends are electrically connected to the circuit pattern;
A piezoelectric vibrator having a terminal electrically connected to the other end of the first and second lead wires;
The piezoelectric vibrator is held hollow by the other ends of the first and second lead wires,
At least a part of the first lead wire not in contact with the circuit pattern and the piezoelectric vibrator and at least a part of the second lead wire not in contact with the circuit pattern and the piezoelectric vibrator; A piezoelectric device provided with a connecting portion for connecting the two. The connection surface with the piezoelectric vibrator at the other end of the first and second lead wires is a back surface of a surface facing a placement surface on which one end of the first and second lead wires is placed. 1. The piezoelectric device according to 1. An outer container having a recess on the bottom,
One end of the first and second lead wires is placed on the bottom surface of the outer container,
The piezoelectric device according to claim 1, wherein the piezoelectric vibrator is disposed inside the recess. The piezoelectric device according to claim 3, wherein a connection surface with the piezoelectric vibrator at the other end of the first and second lead wires is a surface facing the inner side of the recess. An electronic apparatus in which the piezoelectric device according to claim 1 is mounted. An automobile on which the piezoelectric device according to claim 1 is mounted.

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