JP2010068061A - Surface-mounted crystal oscillator - Google Patents

Abstract

An oscillator for surface mounting, in which electrical connection of a probe (terminal pin) to a crystal inspection terminal is ensured and productivity is improved, is provided.
A ceramic container 1 having a rectangular shape in plan view having a recess on at least one main surface, and excitation electrodes 8a and 8b accommodated in the recess and hermetically sealed by a metal cover on one main surface and the other main surface. A crystal piece 3, an IC chip 2 accommodated in the recess, and a crystal inspection terminal provided on the outer surface of the ceramic container 1 and electrically connected to the excitation electrodes 8 a and 8 b of the crystal piece 3. In the crystal oscillator for surface mounting, crystal inspection terminals 7a1 and 7a2 electrically connected to the excitation electrode 8a on the one main surface are formed on the outer side surfaces of the two sides of the container body 1, and the excitation on the other main surface is performed. The crystal inspection terminals 7b1 and 7b2 electrically connected to the electrode 8b are formed on the outer surfaces of the remaining two sides.
[Selection] Figure 1

Description

  The present invention relates to a surface mount crystal oscillator (hereinafter referred to as a surface mount oscillator) in the technical field, and more particularly to a crystal inspection terminal for inspecting vibration characteristics (electrical characteristics) of a crystal resonator.

(Background of the Invention)
Since surface-mounted oscillators are small and lightweight, they are built in as a frequency and time reference source, especially in portable electronic devices. As one of such devices, an IC chip and a crystal piece are accommodated in a ceramic container, and a crystal inspection terminal is provided on the outer surface of the ceramic container to measure the vibration characteristics of the crystal resonator.

(Example of conventional technology)
FIG. 2 is a diagram for explaining a conventional example. FIG. 2A is a cross-sectional view of the surface-mounted oscillator in the long side direction, FIG. 2B is a side view of the short side direction, and FIG. FIG.

  The surface mount oscillator accommodates an IC chip 2 and a crystal piece 3 in a ceramic container 1 and covers a metal cover 4 so as to be hermetically sealed. The ceramic container 1 includes a bottom wall and a frame wall, and has an inner wall step at one end. The ceramic container 1 has a circuit terminal (not shown) on the inner bottom surface and a crystal holding terminal 5 (ab) on the inner wall step. The crystal terminal in the circuit terminal is electrically connected to the crystal holding terminal 5 (ab).

  On the outer bottom surface of the ceramic container 1, there are mounting terminals 6 serving as power supply, output, ground and standby terminals at the four corners of the outer periphery, and they are electrically connected to the corresponding circuit terminals. A pair of opposed outer surfaces of the ceramic container 1, for example, both sides in the long side direction, have crystal inspection terminals 7 (ab) and are electrically connected to the crystal holding terminals 5 (ab) by the wiring paths 11.

  The crystal inspection terminal 7 (ab) is formed by providing depressions in the intermediate layer excluding the uppermost layer and the lowermost layer of the ceramic container 1. Usually, for example, an electrode through hole (through hole) is formed in the state of a ceramic sheet, and the crystal inspection terminal 7 (ab) is formed by dividing into individual ceramic containers 1.

  The IC chip 2 has at least an oscillation circuit integrated and has an IC terminal (not shown) on a circuit function surface (one main surface). One main surface of the IC chip 2 is fixed to the inner bottom surface of the ceramic container 1 by flip chip bonding, and the IC terminal is electrically connected to the circuit terminal.

  The quartz crystal piece 3 has excitation electrodes 8 (ab) on both principal surfaces of one principal surface and the other principal surface, and extends extraction electrodes 9 (ab) on both sides of one end. Both ends of one end of the crystal piece 3 from which the extraction electrode 9 (ab) extends are electrically connected and fixed to the crystal holding terminal 5 (ab) by the conductive adhesive 10. The metal cover 4 is joined to the metal ring 11 provided on the opening end surface of the ceramic container 1 by seam welding.

In this way, the terminal pin 12 (ab) indicated by the arrow of the probe is brought into contact with (contacted with) the crystal inspection terminal 7 (ab) on the outer surface of the ceramic container 1 from both sides, and the DLD (Drive Level Dependency) characteristic is obtained. Measure the electrical characteristics of the crystal unit. Then, those that do not satisfy the standard such as crystal impedance (CI) for the crystal unit alone are excluded.
JP 2007-104075 A

(Problems of conventional technology)
However, in the method for measuring a crystal resonator having the above configuration, as the surface-mount oscillator is further miniaturized (for example, 2.5 × 2.0 mm or less), the crystal inspection terminal 7 (ab) is also decreased (for example, (0.3 × 0.6 mm)). ) The terminal pin of the probe does not come in contact, for example, due to the positioning accuracy error of the terminal pin 12 (ab), so that it does not penetrate into the recess where the crystal inspection terminal 7 (ab) is formed, and on both side surfaces or the outer surfaces of the upper and lower surfaces. For these reasons, the productivity of surface mount oscillators has been reduced.

(Object of invention)
It is an object of the present invention to provide a surface mount oscillator that ensures electrical connection of a probe (terminal pin) to a crystal inspection terminal and has improved productivity.

  According to the present invention, as shown in the claims (Claim 1), the ceramic container having a rectangular shape in a plan view having a concave portion on at least one main surface, and enclosed in the concave portion and hermetically sealed by a metal cover. A crystal piece having excitation electrodes on the main surface and the other main surface, an IC chip accommodated in the recess or the recess provided on the other main surface, and an excitation electrode of the crystal piece provided on the outer surface of the ceramic container And a crystal inspection terminal electrically connected to the crystal inspection terminal for surface mounting, wherein the crystal inspection terminal electrically connected to the excitation electrode of the one main surface is formed on the outer surface of the two sides of the container body. The crystal inspection terminals electrically connected to the excitation electrodes on the other main surface are formed on the outer surfaces of the remaining two sides.

  With such a configuration, there are two crystal inspection terminals that are electrically connected to the excitation electrodes on one main surface and the other main surface of the crystal piece, each formed on the outer surface of the two sides. Therefore, by contacting the terminal pin of the probe to the crystal inspection terminals on each of the two sides, if either one of the crystal inspection terminals contacts the terminal pin, the excitation electrode is electrically connected. Thereby, the contact probability of the terminal pin with respect to the crystal inspection terminal can be increased, and productivity can be maintained.

  According to a second aspect of the present invention, in the first aspect, the outer surface of each of the two sides is an outer surface adjacent to each other with a corner portion interposed therebetween. This clarifies the outer surface on which two crystal inspection terminals connected to each excitation electrode are formed. In this case, the wiring pattern connected to the crystal inspection terminal can be formed in the same plane, for example.

  FIG. 1 is a convenient plan view of a surface mount oscillator illustrating an embodiment of the present invention. In addition, the same number is attached | subjected to the same part as a prior art example, and the description is simplified or abbreviate | omitted.

  As described above, the surface-mount oscillator holds the crystal of the inner wall stepped portion on both sides of one end of the crystal piece 3 from which the extraction electrode 9 (ab) extends by flip chip bonding the IC chip 2 to the inner bottom surface of the ceramic container 1. The terminal is fixed to the terminal 5 (ab) with the conductive adhesive 10, and the metal cover 4 is joined and hermetically sealed. The ceramic container 1 has a mounting terminal 6 on the outer bottom surface and a crystal inspection terminal 7 (ab) electrically connected to the crystal holding terminal 5 (ab) on the outer surface.

  The crystal inspection terminals 7 (ab) in this embodiment are formed as 7 (a 1, a 2) and 7 (b 1, b 2) on the outer side surfaces of the two sides of the container body 1, respectively. ab). Here, one of the crystal holding terminals 7 (ab) on both sides of the one end portion 7a (the lower side in the figure) is a crystal inspection terminal 7 (a1, 7a on the outer side which is a short side on one end side and a long side on the lower side. Are electrically connected to each other by a wiring path 11.

  The other of the crystal holding terminals 7 (ab) on both sides of the one end portion 7b (upper side in the figure) is a crystal inspection terminal 7 (a1, a2) on the outer side which is the short side on the other end side and the long side on the upper side. Are electrically connected to each other by a wiring path 11. Each wiring path 11 is connected to the crystal inspection terminal 7 (a1, a2) through, for example, a laminated surface that is the same plane. In short, the crystal inspection terminals 7 (a 1, a 2) and 7 (b 1, b 2) are formed on the outer sides of the two sides sandwiching the corners of a pair of diagonal parts.

  Then, the terminal pins 12 (a1, a2) of one of the probes having the same polarity are in contact with the crystal inspection terminals 7 (a1, a2), and the other polarity of the crystal inspection terminals 7 (b1, b2). The terminal pins 12 (b1, b2) are electrically connected to inspect the electrical characteristics including, for example, the DLD characteristics of the crystal resonator.

  In such a configuration, since the crystal inspection terminals 7 (a1, a2) and 7 (b1, b2) are formed on the outer side surfaces of the two sides, the terminal pins 12 (a1, a2) and 12 abutting on the terminals are formed. If one of (b1, b2) contacts, the electrical characteristics of the crystal resonator can be measured. Therefore, the probability that the terminal pins 12 (a1, a2) and 7 (b1, b2) of the probe come into contact with the crystal inspection terminals 7 (a1, a2) and 7 (b1, b2) is increased as compared with the conventional example. . Thereby, the productivity of the surface mount oscillator can be increased.

  Further, in this example, since the crystal inspection terminals 7 (a1, a2) and 7 (b1, b2) are formed on both outer surfaces sandwiching the corner portions, the wiring path 11 can be formed on the same plane and wired. Making it easier to manufacture. When the crystal inspection terminals 7 (a1, a2) and 7 (b1, b2) are formed on the opposite outer surfaces, the wiring paths 11 intersect with each other, so that wiring on the same plane becomes difficult. However, since it becomes possible if a multilayer surface is used by a via hole etc., these are not excluded in this invention.

(Other matters)
In the above embodiment, the surface mount oscillator is a ceramic container having a concave portion on one main surface, but has a concave portion on both main surfaces, a crystal piece 3 in the concave portion on one main surface, and an IC in the concave portion on the other main surface. The same applies to the case where the chip 2 is accommodated. Further, the crystal piece 3 has the extraction electrode 9 (ab) extended on both sides of one end portion, but the same applies to the case where the crystal piece 3 extends to both end portions of the crystal piece 3 and holds (fixes) the same portion.

It is a convenient top view of the surface mount oscillator explaining one embodiment of the present invention. FIG. 6A is a cross-sectional view of a surface-mounted oscillator in the long side direction, FIG. 5B is a side view of the short side direction, and FIG. is there.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Ceramic container, 2 IC chip, 3 Crystal piece, 4 Metal cover, 5 Crystal holding terminal, 6 Mounting terminal, 7 Crystal inspection terminal, 8 Excitation electrode, 9 Lead electrode, 10 Conductive adhesive, 11 Metal ring, 12 Terminal pin.

Claims (2)

A rectangular ceramic container in a plan view having a recess on at least one main surface;
A crystal piece housed in the recess and hermetically sealed by a metal cover, and having excitation electrodes on one main surface and the other main surface;
An IC chip accommodated in the recess or the recess provided in the other main surface;
In a crystal oscillator for surface mounting comprising a crystal inspection terminal provided on the outer surface of the ceramic container and electrically connected to the excitation electrode of the crystal piece,
The crystal inspection terminal electrically connected to the excitation electrode of the one main surface is formed on the outer side surfaces of the two sides of the container body,
A crystal oscillator for surface mounting, wherein the crystal inspection terminals electrically connected to the excitation electrodes on the other main surface are formed on the outer surfaces of the remaining two sides.   2. The surface-mount crystal oscillator according to claim 1, wherein the outer surfaces of the two sides are outer surfaces adjacent to each other with a corner portion interposed therebetween.