Crystal oscillators and crystal devices

Abstract

To provide a crystal vibration piece with a novel structure that can improve the mounting accuracy on a container even though it is miniaturized and to provide a crystal device including the same.SOLUTION: A crystal vibration piece 10 includes a crystal piece 10a of a rectangular shape in plan view, a first excitation electrode 10b and a second excitation electrode 10c provided on a main surface opposite to the crystal piece, a first extraction electrode 10d extending from the first excitation electrode to one end side of one side 10aa of the crystal piece, and a second extraction electrode 10e extending from the second excitation electrode to the other end side of the one side. Planar shapes of portions 10da, 10ea that are portions of the first and second extraction electrodes along a first side on the same main surface of the crystal piece are made to be different from each other so that an image recognition unit of a mounting device used to mount the crystal vibration piece to a container can acquire a desired recognition pattern.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a crystal vibrating piece capable of improving the mounting accuracy to a container and a crystal device using the same.

Background Art

[0002] Some crystal resonators, which are a type of crystal device, include a crystal vibrating piece that vibrates in a thickness-shear vibration mode and a container that encloses the crystal vibrating piece. The crystal vibrating piece includes a crystal piece, excitation electrodes provided on the front and back surfaces of the crystal piece, and lead-out electrodes drawn from the excitation electrodes. The demand for miniaturization of such crystal resonators is increasing more and more. Therefore, the crystal vibrating piece and the container are also becoming smaller and smaller. Accordingly, if the mounting accuracy when mounting the crystal vibrating piece to the container is not improved, displacement of the crystal vibrating piece with respect to the container will occur, leading to problems such as deterioration of the electrical characteristics and shock resistance characteristics of the crystal resonator.

[0003]

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as the miniaturization of the crystal piece further progresses with the miniaturization of the crystal resonator, the area of the crystal piece becomes narrower and narrower, making it difficult to provide a positioning pattern on the crystal piece separately from the excitation electrodes. Alternatively, one could consider using the excitation electrode itself as a positioning pattern. However, in that case, the problems associated with the miniaturization of the quartz crystal resonator still arise. Specifically, as the quartz crystal resonator becomes smaller, the nozzle that adsorbs the quartz crystal in the mounting device for mounting the quartz crystal in the container becomes larger than the planar shape of the excitation electrode. As a result, part of the adsorption nozzle enters the image of the excitation electrode used to confirm the position of the quartz crystal (see Figure 3), and accurate image information cannot be obtained. Alternatively, it is conceivable to mount the quartz crystal vibrator into the container by using the extraction electrode, which is integrally provided with the excitation electrode on the quartz crystal and extends to the end of the quartz crystal, as a positioning pattern. However, in that case, as will be explained in detail in the first comparative example (see Figure 5) described later, if the shape of the extraction electrode is simple, misrecognition may occur, making it impossible to improve mounting accuracy.

[0006] It is also conceivable to recognize the external shape of the quartz crystal itself and position the quartz crystal oscillator in the container based on that. However, in that case, although the details will be explained in the second comparative example below, the following problems arise. Specifically, in order to accommodate the miniaturization of quartz crystals, the mainstream manufacturing method for quartz crystals is the wafer process and photolithography technology. Therefore, a method is employed in which a large number of quartz crystal oscillators are formed in a matrix on a quartz wafer, and each quartz crystal oscillator is broken off from this quartz wafer to form individual pieces for use. As a result, irregularly shaped portions are created in the broken-off parts of the quartz crystal oscillator (see Figure 6), which reduces the accuracy of positioning the quartz crystal oscillator in the container.

[0007] On the other hand, other improvement measures could be considered, such as introducing a high-resolution image recognition unit for the mounting device that installs the quartz crystal into the container, but the cost of introducing such a device would be a problem. The problems described above become increasingly pronounced as quartz crystal oscillators become smaller. Specifically, they become more and more noticeable when manufacturing quartz crystal oscillators in package sizes such as 1008 size (long side dimension approximately 1 mm, short side dimension approximately 0.8 mm), 0806 size (long side dimension approximately 0.8 mm, short side dimension approximately 0.6 mm), and even smaller. This application has been made in view of the above-mentioned points, and therefore, the object of this application is to provide a quartz oscillator with a novel structure that can improve the mounting accuracy in a container even as the miniaturization of quartz oscillators progresses, and a quartz device using the same. [Means for solving the problem]

[0008] To achieve this objective, the present invention provides a quartz vibrator comprising: a quartz crystal piece having a rectangular shape in plan view; a first excitation electrode provided on a first main surface of the quartz crystal piece; a second excitation electrode provided on a second main surface facing the first main surface; a first extraction electrode extending from the first excitation electrode to one end of the first side of the quartz crystal piece; and a second extraction electrode extending from the second excitation electrode to the other end of the first side of the quartz crystal piece. The planar shapes of the portions of the first extraction electrode and the second extraction electrode that lie along the first edge and on the same main surface of the quartz crystal are different from each other so that an image recognition unit of a mounting device used to mount the quartz crystal in a container can acquire a desired recognition pattern.

[0009] In carrying out this invention, when the length of the portion of the first extraction electrode along the first side in the direction parallel to the first side is defined as L1, the length of the portion of the second extraction electrode along the first side in the direction parallel to the first side is defined as L2, and the length of the first side is defined as L0 (see Figure 1), it is preferable that L1 > L2, and that L1 = 0.25L0 to 0.5L0, and more preferably 0.35L0 to 0.5L0. Also, it is preferable that L2 = 0.1L0 to 0.2L0.

[0010] Furthermore, in carrying out this invention, the following configuration may also be used. That is, the portion of the first extraction electrode along the first side may have a stepped shape consisting of a first portion parallel to the first side and located on the side of the excitation electrode, and a second portion parallel to the first portion, located on the side of the first side, and shorter in length than the first portion (see Figure 4). In this case, when L3 is defined as the length of the first part parallel to the first side, and L4 is defined as the length of the second part parallel to the first side, it is preferable that L3 is in the range of L3 = 0.4L0 to 0.65L0, and more preferably in the range of 0.5L0 to 0.7L0, with respect to the length L0 of the first side. Furthermore, it is preferable that L4 is in the range of L4 = 0.1L3 to 0.5L3 with respect to L3 (see Figure 4). In configurations with a stepped shape, when the quartz crystal vibrator is connected and fixed to the container with conductive adhesive, it is easier to avoid short-circuiting between the two lead electrodes even if the conductive adhesive wraps around from the side of the first edge of the quartz crystal to the surface of the quartz crystal.

[0011] Furthermore, a crystal device relating to another invention of this application is characterized by comprising the crystal vibrating element according to the present invention described above, a container enclosing the crystal vibrating element, and fixing means for connecting and fixing the crystal vibrating element to the container. [Effects of the Invention]

[0012] According to the quartz crystal vibrator of this invention, the portions of the first and second extraction electrodes that run along the first edge of the quartz crystal, i.e., the portions corresponding to the end ends of the first and second extraction electrodes, are made into predetermined shapes that are different from each other, as described above. Therefore, compared to cases where this is not the case, the image recognition unit of the mounting device for mounting the quartz crystal vibrator into a container can more easily extract a good pattern as a positioning pattern when mounting the quartz crystal vibrator into the container. Accordingly, a novel quartz crystal vibrator structure that can improve mounting accuracy into a container can be realized. Furthermore, according to the quartz oscillator of this invention, since predetermined portions corresponding to the end sides of the first and second extraction electrodes are each shaped differently from each other, and these quartz resonators are mounted in a container, a quartz oscillator is obtained in which the quartz resonators are mounted in a predetermined positional relationship with the container. Therefore, a quartz oscillator having desired electrical characteristics and shock resistance can be provided. [Brief explanation of the drawing]

[0013] [Figure 1]FIG. 1(A) is a plan view for explaining the crystal resonator 10 of the first embodiment, and FIG. 1(B) is a cross-sectional view thereof. [Figure 2] It is a figure for explaining the outline of the mounting apparatus 20 for mounting a crystal resonator in a container. [Figure 3] It is a figure which showed the image at the time of recognizing the crystal resonator 10 of the first embodiment by the image recognition part of a mounting apparatus. [Figure 4] It is a plan view for explaining the crystal resonator 30 of the second embodiment. [Figure 5] It is an explanatory view of the first comparative example. FIG. (A) is a plan view for explaining the structure of the crystal resonator 100 of the first comparative example, and FIG. (B) is a figure which showed the image which recognized the crystal resonator 100 of the first comparative example by the image recognition part of a mounting apparatus. [Figure 6] It is an explanatory view of the second comparative example. FIG. (A) is a plan view for explaining the structure of the crystal resonator 200 of the second comparative example, and FIG. (B) is a figure which showed the image which recognized the crystal resonator 200 of the second comparative example by the image recognition part of a mounting apparatus. [Figure 7] It is a plan view and a cross-sectional view for explaining the crystal oscillator 50 of an embodiment.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the crystal resonator and crystal oscillator of this invention will be described with reference to the drawings. Note that each drawing used in the description only schematically shows the invention to such an extent that it can be understood. In each drawing used in the description, the same components are denoted by the same numbers, and the description thereof may be omitted. In addition, the shapes, dimensions, etc. described in the following description are merely preferred examples within the scope of this invention. Therefore, the present invention is not limited only to the following embodiments.

[0015] 1. Description of Embodiments of Crystal Resonators The crystal resonator of the present invention includes a crystal piece having a rectangular shape in plan view, a first excitation electrode provided on the first main surface of the crystal piece, a second excitation electrode provided on the second main surface facing the first main surface, a first lead-out electrode extending from the first excitation electrode near one side of the first side of the crystal piece and on one end side of the side, and a second lead-out electrode extending from the second excitation electrode near the one side of the crystal piece and on the other end side of the side. And, in the crystal resonator of the present invention, the planar shapes of the portions of the first lead-out electrode and the second lead-out electrode along the first side of the crystal piece, which are located on the same main surface of the crystal piece (hereinafter sometimes abbreviated as a predetermined portion), are different from each other so that an image recognition unit of a mounting device used when mounting the crystal resonator in a container can obtain a desired recognition pattern. Here, the fact that the predetermined portions of the first lead-out electrode and the second lead-out electrode are different from each other so that the image recognition unit of the mounting device can obtain a desired recognition pattern means that they are made different so as to give a recognition pattern that allows the image recognition device to accurately determine the position of the crystal oscillator. Therefore, various ways of making them different are acceptable as long as the above idea can be achieved. To deepen the understanding, several embodiments will be described below together with comparative examples.

[0016] 1-1. Crystal Resonator of the First Embodiment FIG. 1(A) is a plan view for explaining the crystal resonator 10 of the first embodiment, and FIG. 1(B) is a cross-sectional view taken along the line P-P of FIG. 1(A). This crystal resonator 10 includes a crystal piece 10a having a rectangular shape in plan view, a first excitation electrode 10b provided on the first main surface of the crystal piece 10a, a second excitation electrode 10c provided on the second main surface facing the first main surface, a first lead-out electrode 10d extending from the first excitation electrode 10b near the first side 10aa of the crystal piece 10a and on one end side of the first side 10aa, and a second lead-out electrode 10e extending from the second excitation electrode 10c near the first side 10aa of the crystal piece 10a and on the other end side of the first side 10aa. Furthermore, the ends of the first extraction electrode 10d and the second extraction electrode 10e are routed from the main surface of the quartz crystal 10a where these ends are formed, through the side surface of the first edge 10aa, to the main surface of the quartz crystal 10a on the opposite side. Therefore, the ends of the first extraction electrode 10d and the second extraction electrode 10e exist on the two main surfaces of the quartz crystal 10a in similar shapes and arrangements. This allows the quartz crystal 10 to be mounted in the container without having to worry about the front or back side of the quartz crystal 10.

[0017] In the first embodiment, the planar shapes of the predetermined portions 10da and 10ea (hereinafter sometimes abbreviated as predetermined portions) of the first extraction electrode 10d and the second extraction electrode 10e, which are along the first edge 10aa of the quartz piece 10a and are located on the same main surface of the quartz piece 10a, are different as follows. In other words, when L1 is defined as the length of the portion of a predetermined part 10da of the first extraction electrode 10d located on the same main surface of the crystal piece 10a that is aligned with the first side 10aa, L2 is defined as the length of the portion of a predetermined part 10ea of ​​the second extraction electrode 10e that is aligned with the first side 10aa, and L0 is defined as the length of the first side 10aa (see Figure 1(A)), then L1 > L2, and L1 is a dimension selected from 0.25L0 to 0.5L0, more preferably from 0.35L0 to 0.5L0, and L2 is a dimension selected from 0.1L0 to 0.2L0. If L1 exceeds 0.5L0, there is a risk of short-circuiting the first excitation electrode 10b and the second excitation electrode 10c due to the conductive adhesive used to connect and fix the quartz piece 10a to the container, and the first excitation electrode 10b and the second excitation electrode 10c may face each other at the lead-out electrode location, resulting in unwanted capacitance, which is undesirable. If L1 is less than 0.2L0, it is undesirable because it is difficult to distinguish between the predetermined portion 10da and the predetermined portion 10ea. If L2 is less than 0.1L0, the necessary area for adhesion with the conductive adhesive cannot be obtained, and if L2 is greater than 0.2L0, it is undesirable because it is difficult to distinguish between the predetermined portion 10da and the predetermined portion 10ea. Here, the quartz piece 10a vibrates in thickness-slip mode and is typically an AT-cut quartz piece, but a 2-turn cut quartz piece, such as an SC-cut, may also be used.

[0018] The effects of the first embodiment are as follows: The crystal fragment 10a to which the present invention is applied is small. Specifically, in terms of the external dimensions of the crystal oscillator container, in the case of a so-called 1008 size crystal oscillator, the long side dimension of the crystal fragment 10a is about 0.7 mm and the short side dimension (L0 above) is about 0.5 mm. In the case of a so-called 0806 size crystal oscillator, the long side dimension of the crystal fragment 10a is about 0.6 mm and the short side dimension is about 0.4 mm, so the crystal fragment is small. Because the crystal fragment 10a is small in this way, it is not easy to mount the crystal oscillator 10 in the container at the desired position, so the structure of the present invention becomes important. In other words, when L1 and L2 are set as described above, there is a long straight portion of L1. Therefore, when this crystal vibrator 10 is recognized by an image recognition device, the orientation of the crystal vibrator 10a can be accurately determined compared to when L1 and L2 are not set as described above, for example, when L1=L2. The effects of the present invention will be explained below based on experimental results.

[0019] <Explanation of image recognition results> Next, in order to deepen the understanding of the present invention, we will explain the experimental results of image recognition of the quartz crystal vibrator 10 of the first embodiment using the image recognition unit of the mounting device. Figure 2 is a schematic diagram of the mounting device. The mounting device 20 includes a suction and transport mechanism 20a that picks up and transports the quartz crystal oscillator 10, and an image recognition unit 20b that grasps the orientation of the quartz crystal oscillator 10. The suction and transport mechanism 20a is located on the upper side in the vertical direction, and the image recognition unit 20b is located on the lower side in the vertical direction. When the suction and transport mechanism 20a picks up the quartz crystal oscillator 10 and transports it above the image recognition unit 20b, the image recognition unit 20b recognizes the quartz crystal oscillator 10 and grasps its orientation. Then, according to the orientation, the suction and transport mechanism 20a itself rotates in plane so that the quartz crystal oscillator 10 is in a predetermined position in a container for a quartz crystal oscillator (not shown), and then places the quartz crystal oscillator 10 in the container. Since conductive adhesive is pre-applied to the predetermined position in the container, the first side 10aa portion of the quartz crystal oscillator 10 is bonded to the container via the conductive adhesive.

[0020] Figure 3 shows an image of the quartz crystal oscillator 10 recognized by the image recognition unit shown in Figure 2. In the recognized image, the convex portions 20x that appear above and below the first excitation electrode 10b are images of the suction nozzle of the suction and transport mechanism 20a of the mounting device 20 shown in Figure 2. In other words, because the suction nozzle is larger than the excitation electrode 10b, part of the image of the suction nozzle has entered into the image of the excitation electrode 10b. If the excitation electrode itself is used as the positioning image, the image of the suction nozzle will enter into the image in this way, making it impossible to accurately grasp the orientation of the quartz crystal oscillator 10. In contrast, in the present invention, as the positioning pattern of the quartz crystal oscillator 10 in the container, the image region 20y of a predetermined portion 10da of the extraction electrode is used to extract a reference line 20z for orientation correction, thereby enabling accurate orientation information to be obtained.

[0021] 1-2. Crystal oscillator of the second embodiment Next, a second embodiment of the quartz crystal oscillator will be described. Figure 4 is a plan view illustrating the quartz crystal oscillator 30 of the second embodiment. The differences between the quartz crystal vibrator 30 of the second embodiment and the quartz crystal vibrator 10 of the first embodiment are the following structural parts. In other words, the portion of the first extraction electrode along the first side 30aa has a stepped shape 30x consisting of a first portion 30x1 which is parallel to the first side 30aa and located on the side of the excitation electrode 10b, and a second portion 30x2 which is parallel to the first portion 30x1, located on the side of the first side 30aa, and shorter in length than the first portion 30x1. In this case, when L3 is defined as the length in the direction parallel to the first side 30aa of the first part 30x1, and L4 is defined as the length in the direction parallel to the first side of the second part 30X2, L3 should be a dimension selected from the range L3 = 0.5L0 to 0.7L0, and more preferably from the range 0.4L0 to 0.65L0, relative to the length L0 of the first side. Similarly, L4 should be a dimension selected from the range L4 = 0.1L3 to 0.5L3, relative to L3. The extent to which L4 is shortened relative to L3 should be determined considering the effect of preventing short circuits caused by leakage of conductive adhesive, which will be discussed later. Furthermore, when the length in the direction perpendicular to the first side 30aa of the first part 30x1 is defined as L5, and the length in the direction perpendicular to the first side of the second part 30X2 is defined as L6, it is preferable that L6 be a dimension selected from the range of 0.2L5 to 0.8L5. By having different dimensions in this way, it is easier to prevent short circuits between electrodes even if conductive adhesive wraps around near the first side 10aa of the quartz piece 10a. Note that the extent to which L6 should be shorter than L5 should be determined by considering the amount of conductive adhesive wrap-around, etc.

[0022] In the case of the crystal vibrator 30 of the second embodiment, since the length of the second portion 30x2 in the stepped shape portion 30x is short, a region 30y without electrodes is created along the first edge 30aa. Therefore, when the crystal vibrator is connected and fixed to the container with conductive adhesive, even if the conductive adhesive wraps around from the side of the first edge 30aa of the crystal vibrator to the surface side of the crystal vibrator 10a, the effect of the region 30y without electrodes makes it easier to avoid a short circuit between the two lead electrodes. In addition, because of the stepped shape, there is also the advantage that feature extraction during image recognition is easier. In both the case of the quartz crystal oscillator 10 of the first embodiment and the quartz crystal oscillator 30 of the second embodiment, the excitation electrodes and extraction electrodes can be formed using well-known thin-film deposition techniques and photolithography techniques, so the shape of the predetermined portion of the first extraction electrode and the second extraction electrode can be easily formed into a desired shape.

[0023] 3. Explanation of the comparative example Next, we will describe some comparative examples to clarify the effects of the present invention. (Comparative Example 1) Figure 5(A) is a plan view of the quartz crystal oscillator 100 of the first comparative example, and Figure 5(B) is a diagram showing the image obtained when the quartz crystal oscillator 100 of the first comparative example is recognized by the image recognition unit 20b (see Figure 2). In the first comparative example, the quartz crystal oscillator 100 has a predetermined portion 101 of the first extraction electrode along the first side 100a of the quartz crystal and a predetermined portion 103 of the second extraction electrode along the first side 100a of the quartz crystal, both having the same planar shape and size, and the dimensions La and Lb of each of these predetermined portions 101 and 103 in the direction along the first side 100a are La ≈ Lb, and with respect to the dimension L0 of the first side 100a, La ≈ 0.3L0 and Lb ≈ 0.3L0. When the crystal oscillator 100 of this first comparative example is recognized by the image recognition unit 20b (see Figure 2), the feature lines 105 of the recognized image are affected by the undesirable shapes of predetermined parts 101 and 103, and therefore do not accurately indicate the orientation of the crystal oscillator 100. In other words, the reference lines 105 for positioning do not accurately indicate the orientation of the crystal oscillator 100. As a result, when this crystal oscillator 100 is mounted in the container by the mounting device 20 (see Figure 2), it is mounted in an incorrect position.

[0024] (Comparative Example 2) Figure 6(A) is a plan view of the quartz crystal oscillator 200 of the second comparative example, and Figure 6(B) is a diagram showing the image obtained when the quartz crystal oscillator 200 of the second comparative example is recognized by the image recognition unit 20b (see Figure 2). The quartz crystal vibrator 200 of the second comparative example has irregularly shaped portions 201 near both ends of the first side 200a, which occur when the quartz crystal vibrator 200 is broken off from the quartz wafer (not shown). Note that the quartz crystal vibrator 200 of the second comparative example has the middle portion of the extraction electrode pulled out diagonally from the excitation electrode; however, this is due to the sample used in the experiment and is not an essential part of the second comparative example, so it can be ignored. When the crystal oscillator 200 of this second comparative example is recognized by the image recognition unit 20b (see Figure 2), the recognized image features 203 are affected by the shape of the irregularly shaped portion 201, and therefore do not accurately indicate the orientation of the crystal oscillator 200. As a result, when this crystal oscillator 200 is mounted in the container by the mounting device 20 (see Figure 2), it is mounted in a misaligned position.

[0025] 4. Description of the crystal device in the embodiment Next, embodiments of another invention of the crystal device in this application will be described. This description will be given with reference to Figure 7. Figure 7(A) is a plan view of a crystal oscillator 50 as an example of the crystal device of this invention, and Figure 7(B) is a cross-sectional view of the crystal oscillator 50 of the embodiment, cut along the QQ line in Figure 7(A). The crystal oscillator 50 of this embodiment is formed by mounting the crystal oscillating element 10 of the first embodiment inside the container 51 and connecting and fixing it to the container 51 with a fixing means, such as a conductive adhesive 60. Specifically, the container 51 comprises a rectangular recess 51a in plan view that encloses the quartz crystal vibrator 10, a bank portion 51b surrounding the recess 51a, a connection pad 51c provided at a predetermined position in the recess 51a on the bottom surface of the recess 51a, and an external connection terminal 51d provided on the back bottom surface of the container 51 for connecting to an external device. The container 51 can be made of, for example, a ceramic package.

[0026] The quartz crystal oscillator 10 is then fixed in the recess of the container 51 using conductive adhesive 60, with the predetermined portions 10da and 10ea of ​​the extraction electrodes and the connecting pad 51c in a corresponding positional relationship. However, when manufacturing the quartz crystal oscillator 50, the mounting of the quartz crystal oscillator 10 into the container 51 is performed using the predetermined portion 10da of the extraction electrodes. Therefore, the mounting of the quartz crystal oscillator 10 into the container 51 can be performed with greater precision compared to when the predetermined portion 10da of the extraction electrodes is not used. A lid member 53 (see Figure 7(B)) is attached to the bank portion 51b of the container 51 in a manner corresponding to the sealing method, thereby hermetically sealing the crystal vibrator 10 inside the container 51. In this embodiment, the quartz oscillator 50 is constructed by precisely mounting the quartz crystal oscillating element 10 in the container 51. Therefore, even when the quartz oscillator 50 is miniaturized, the desired electrical characteristics and shock resistance characteristics can be obtained.

[0027] In the above description of the embodiment of the quartz device, an example was described in which a container having a recess was used. However, a container with a structure consisting of a flat base having a connecting pad and a cap-shaped lid member having a space that can enclose the quartz vibrator 10 may also be used. Furthermore, while the above description of the embodiment of the crystal device gave an example of a simple crystal oscillator, the crystal device referred to in this invention also includes other structures, such as a crystal device that incorporates a temperature sensor. [Explanation of Symbols]

[0028] 10: Quartz crystal vibrator of the first embodiment 10a: Quartz crystal 10aa: First edge of the quartz crystal 10b: First excitation electrode 10c: Second excitation electrode 10d: First extraction electrode 10da: A predetermined portion of the first extraction electrode 10e: The second extraction electrode 10ea: A predetermined portion of the second extraction electrode L0: Length of the first side of the quartz crystal L1: Length of a predetermined bubble of the first extraction electrode L2: Length of a predetermined portion of the second extraction electrode 20: Mounting device 20a: Suction and transport mechanism 20b: Image recognition unit 30: Crystal oscillator of the second embodiment 30aa: First side of the crystal oscillator 30x: Stepped shape section 30x1: First part of the stepped shape section 30x2: Second part of the stepped shape 30y: Area without electrodes 50: Crystal device (crystal oscillator) of an embodiment 51: Container 53: Lid component 60: Conductive adhesive

Claims

1. A quartz crystal vibrator comprising: a quartz crystal piece having a rectangular shape in plan view; a first excitation electrode provided on a first main surface of the quartz crystal piece; a second excitation electrode provided on a second main surface facing the first main surface; a first extraction electrode extending from the first excitation electrode to one end of the first side of the quartz crystal piece; and a second extraction electrode extending from the second excitation electrode to the other end of the first side of the quartz crystal piece, The ends of the first and second extraction electrodes are provided on the first and second main surfaces of the quartz crystal in a similar shape and arrangement when the quartz crystal is inverted and compared. A quartz crystal vibrating piece characterized in that the planar shapes of the portions of the first extraction electrode and the second extraction electrode that are along the first edge and are located on the same main surface of the quartz crystal are different from each other to have the dimensions defined below. When L1 is defined as the length of the portion of the first extraction electrode and the second extraction electrode along the first edge, that is located on the same main surface of the quartz crystal and is connected to the excitation electrode located on the same main surface, and that portion is parallel to the first edge, and L2 is defined as the length of the portion of the portion that is routed from the main surface on the opposite side of the same main surface, through the side of the first edge, and back to the same main surface, and L0 is defined as the length of the first edge, The dimensions of L1 and L2 are such that L1 > L2, and L1 is a dimension selected from the range L1 = 0.35L0 to 0.5L0, and L2 is a dimension selected from the range L2 = 0.1L0 to 0.2L0.

2. The portion of the first extraction electrode and the second extraction electrode along the first side, which is located on the same main surface of the quartz crystal, and which is connected to the excitation electrode located on the same main surface, A first portion that is parallel to the first side and located on the excitation electrode side, It has a stepped shape consisting of a second portion that is parallel to the first portion, located on the first side, and shorter in length than the first portion. The crystal oscillating element according to claim 1, characterized in that when the length of the first part in the direction parallel to the first side is defined as L3, the length of the second part in the direction parallel to the first side is defined as L4, and the length of the first side is defined as L0, then L3 is a dimension selected from the range L3 = 0.5L0 to 0.7L0, and L4 is a dimension selected from the range L4 = 0.1L3 to 0.5L3 with respect to L3.

3. The crystal vibrator according to claim 1 or 2, characterized in that L0 is approximately 0.5 mm or less.

4. The quartz crystal vibrator according to any one of claims 1 to 3, characterized in that the quartz crystal is an AT-cut quartz crystal.

5. A quartz crystal vibrator according to any one of claims 1 to 4, A container for mounting the aforementioned quartz crystal, Fixing means for connecting and fixing the quartz crystal vibrator to the container A crystal device characterized by having the following features.

Images