JPS62241416A - Crystal resonator - Google Patents

Abstract

PURPOSE:To package electronic parts to high density by holding a plate type capacitor obtained by forming two capacitors on the top surface of a glass part in one body by using an airtight terminal, holding a crystal element almost at right angles to the main surface of the capacitor, and also pressing a metallic cap onto the airtight terminal. CONSTITUTION:Inner leads 7 and 7' of the airtight terminal 19 are inserted into through holes 31 and 31' of the capacitor 30 and mounted on the top surface of the glass part 12 of the airtight terminal, and the tip part of a lead wire 11 and the electrode 8 of the capacitor 30 are held mechanically and connected electrically. Then, the almost rectangular crystal element 1 is mounted almost at right angles to the main surface of the capacitor 30 and held mechanically by using, for example, solder materials 4 and 4'. Then, while the crystal element 1 is oscillated through lead wires 10, 10', and 11, metal is stuck on an exciting electrode 2 by vapor deposition, etc., to adjust an oscillation frequency. Then, the metallic cap 14 is pressed onto the airtight terminal 19 to seal the capacitor 30 and crystal element 1 airtightly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a crystal resonator used in oscillation circuits of various electronic devices.

2. Description of the Related Art The configuration of a conventional oscillation circuit using a crystal resonator includes a crystal resonator 22 and a capacitor 2, as shown in FIG.
3, a resistor 20, an inverter 21, and other components are individually arranged on a circuit board.

28a and 28b are a front sectional view and a side sectional view showing an example of a conventional crystal resonator, in which a lead wire 1 is attached to an annular shell 13.
8, 18' to the airtight terminal sealed with glass 12,
While holding the crystal element 1 having excitation electrodes 2, 21 and extraction electrodes 3, 3''i formed oppositely on the front and back sides with conductive adhesive or solder 17, 17',
Extracting electrodes 3.3' and inner leads 16, 16'
After electrically connecting them, a metal cap 14 was press-fitted and hermetically sealed.

Problems to be Solved by the Invention However, the above-described configuration has been a considerable obstacle to the high-density packaging of electronic components in recent electronic circuits.

Means for Solving the Problems In order to solve the above problems, the present invention uses an airtight terminal in which a lead wire is inserted into an annular shell and the lead wire is sealed in glass to the shell. 2 on the top of the
Holds a plate-shaped capacitor in which several capacitors are integrally formed, holds a crystal element substantially perpendicular to the main surface of the capacitor, and hermetically seals the capacitor and the crystal element to the airtight terminal. The structure is such that a metal cap is press-fitted into the cap.

Effects of the present invention Due to the above-described configuration, the capacitive element of the oscillation circuit, that is, the capacitor, which was conventionally placed outside the crystal resonator, can be easily incorporated, so that the space for the capacitive element is saved. This makes it possible to realize high-density mounting of electronic components. Furthermore, the number of parts for the user is reduced, contributing to improved reliability of the circuit. Furthermore, conventionally, it was necessary to finely adjust the oscillation frequency using a variable capacitor after mounting on a printed circuit board, but with the crystal resonator of the present invention, the above adjustment process is no longer necessary, etc. will improve.

Examples Examples of the present invention will be described below with reference to the drawings. 2, b and c are a plan view, a front cross-sectional view, and a side cross-sectional view showing an embodiment of the airtight terminal used in the crystal resonator of the present invention.
', 11 is inserted and sealed to the shell 13 by the glass part 12. 3a, b, and c are a plan view, a front view, and a bottom view showing an embodiment of the capacitor used in the crystal resonator of the present invention, and show through holes 3). 3)'
Two electrodes 6, 6' are formed on one main surface of a disk-shaped dielectric substrate 5 having a dielectric substrate 5, and one electrode 8 is formed on the other main surface, and a capacitor is formed on one dielectric substrate 6. The figure shows the state in which two pieces have been formed. FIGS. 1a, b, and c are a plan view, a front sectional view, and a side sectional view showing an embodiment of the crystal resonator of the present invention. The capacitor 300 has a through hole 3) in the inner lead 7.7' of the airtight terminal 19. 3)' are respectively inserted and placed on the top surface of the glass part 12 of the airtight terminal, and the tip of the lead wire 11 appearing on the top surface of the glass part 12 and the electrode 8 of the capacitor 3o are electrically conductive. It is mechanically held and electrically connected by adhesive or solder 9. Next, a substantially rectangular crystal element 1 having excitation electrodes 2.2' and extraction electrodes 3.3' formed opposite to each other on the front and back sides is placed substantially perpendicularly to the main surface of the capacitor 3o. At the same time, the conductive adhesive or solder 4, 4' is used to mechanically hold and electrically connect the lead electrodes 3, 3' and the electrodes 6, 6' of the capacitor, respectively. Next, the electrode 6.6' of the capacitor,
The inner leads 7.7' are mechanically held and electrically connected using a conductive adhesive or solder 4.4'. Extraction electrodes 3, 3' and capacitor electrodes 6.6
The connection between the capacitor electrode 6.6' and the inner lead 7.7' may be made individually as described above, or may be made simultaneously. Next, while causing the crystal element 1 to oscillate via the lead wires 10, 10' and 11, a metal is deposited on the excitation electrode 2 by vapor deposition or the like.
Including adjusting the oscillation frequency. In this case, since the oscillation frequency is adjusted to absorb variations in the capacitance of the capacitor 3o, the frequency accuracy is improved compared to the conventional method. Finally, press fit the metal cap 14 into the airtight terminal 19,
The capacitor 3o and the crystal element 1 are hermetically sealed.

Through the above steps, a crystal resonator 15 having a built-in capacitor as shown in the wiring diagram shown in FIG. 6 with improved frequency accuracy is formed.

In the above embodiment, the crystal element 1 is connected to the inner leads 7 and 7.
Although the crystal element 1 is held on the bisector of the line connecting the crystal element 1, the holding position of the crystal element 1 is not limited to the above-mentioned position. Figure 4a
, b are a plan view and a front sectional view showing an embodiment of a crystal resonator pond of the present invention, in which a 1 ft crystal element is held on a line parallel to a line connecting inner leads 7 and 7'. In this case, a lead-out electrode 40 is formed connected to the lead-out electrode 3'. 6a and 6b are a plan view and a front sectional view showing another embodiment of the crystal resonator of the present invention, in which a crystal element 1 is placed on a line intersecting a line connecting inner leads 7 and 7'.
is held. The wiring diagrams of the embodiments shown in FIGS. 4 and 6 are the same as those shown in FIG.

FIGS. 7a, b, c, and d are plan views showing other embodiments of the capacitor used in the crystal resonator of the present invention.

In the front view, bottom view, and side view, a slit 71 for holding a crystal element is provided. FIGS. 8a and 8b are a front sectional view and a side sectional view showing another embodiment of the crystal resonator of the present invention using the above-mentioned capacitor To. In the above embodiment, the end of the crystal element 1 is inserted into the slit 71 of the capacitor To, and while it is temporarily held, the end part of the crystal element 1 is inserted with the conductive adhesive or solder 4.
．． 4' can be applied or fixed, so the workability of the crystal element assembly process is significantly improved. Furthermore, the slit 71 also plays a positioning role to keep the holding position of the crystal element 1 constant, and greatly contributes to the stability of quality.

FIGS. 9a, b, c, and d are plan views showing other embodiments of the capacitor used in the crystal resonator of the present invention.

Recess 9 for holding the crystal element in the front view, bottom view, and side view.
1 is provided. FIGS. 10a and 10b are a front sectional view and a side sectional view showing another embodiment of the crystal resonator of the present invention using the above-mentioned capacitor 90. In the above embodiment, *the end of the product name plate 1 is placed in the recess 91 of the capacitor 90, and while it is temporarily held, the conductive adhesive or solder 4,
Since 4' can be applied or fixed, the workability of the crystal element assembly process is significantly improved. Furthermore, the depression 9
1 also plays a positioning role to keep the holding position of the crystal element 1 constant, and greatly contributes to the stability of quality.

FIGS. 11a, b, c, and d are plan views showing other embodiments of the capacitor used in the crystal resonator of the present invention.

As shown in FIG. 11 & in the front view 9 bottom view and side view, in the part where the two electrodes 42 and 42' are not formed,
It is provided with through holes 41° and 41' into which inner leads are inserted. 43 is an electrode on the other side.

FIGS. 12a, 12b, 12c and 12d are plan views showing other embodiments of the capacitor used in the crystal resonator of the present invention.

In the front view, bottom view, and side view, only one slit 51 is provided for inserting the inner lead, 52.52' is the electrode on one side, and 63 is the electrode on the other side. b*c+d is a plan view showing another example of the capacitor used in the crystal resonator of the present invention.

In the front view, bottom view, and side cross-sectional view, two capacitors are formed by a laminated capacitor in which an internal electrode 61 is provided inside a dielectric (12).An electrode 64 is connected to the internal electrode 61. The through holes 63 and 63' are for inserting inner leads, and 65 and 65' are external electrodes.

14a and 14b are a plan view and a front sectional view showing another embodiment of the airtight terminal used in the crystal resonator of the present invention, in which three lead wires 81, 82, and 83 are arranged on the same plane. This is what is being done.

In the above description, the crystal element used in the crystal resonator of the present invention has been described as having a substantially rectangular flat plate shape, but the crystal element is not limited to this shape. Figure 15a,
b and c are plan views showing other embodiments of the crystal element used in the crystal resonator of the present invention.

In the front and side views, a chamfered portion 41 is formed at the longitudinal end of the substantially rectangular crystal element.

FIGS. 16 tt, b, and c are a plan view, a front view, and a side view showing another embodiment of the crystal element used in the crystal resonator of the present invention, which is rounded.

FIGS. 17a and 17b are a plan view and a front view showing another embodiment of the crystal element used in the crystal resonator of the present invention, which has a tuning fork shape (excitation electrodes are not shown). .

Each of a and b in FIGS. 18 to 21 is a plan view and a front cross-sectional view showing other embodiments of the capacitor used in the crystal resonator of the present invention, in which slits 46 and 48 for holding the crystal element are shown.
Alternatively, the shape of the depressions 45 and 47 is formed to be substantially similar to the shape of the longitudinal end of the crystal element. By doing as described above, the crystal element can be held in the capacitor more easily and stably (the electrodes of the capacitor are not shown).

22 and 23 are a plan view and a front sectional view respectively showing other embodiments of the airtight terminal used in the crystal resonator of the present invention, in which lead wires are used to hold the crystal element. A substantially U-shaped holding portion 49 is formed at the tip. As a forming method, there are a method of welding or soldering a substantially U-shaped member to the inner lead 7, a method of molding the lead wire with a press, etc.

24 and 26 are a plan view and a front cross-sectional view showing other embodiments of the airtight terminal used in the crystal resonator of the present invention. 7 is formed with a flattened portion 6o.

As for the formation method.

There is a method of forming the lead wire using a press or the like.

26 and 27 are plan views and front views showing other embodiments of the capacitor used in the crystal resonator of the present invention, respectively, in which a notch 75 is provided (the capacitor is (electrodes not shown).

The crystal resonator of the present invention described above has achieved sufficient performance in terms of impact resistance. It may be fixed to the capacitor with an insulating adhesive.

Further, the longitudinal ends and inner leads of the crystal element may be fixed to the capacitor with an insulating adhesive.

It may also be an improved version.

In the above description, the case where the capacitor has a substantially disk shape has been described, but the capacitor used in the crystal resonator of the present invention is not limited to the above shape, and any shape can be applied.

Effects of the Invention As explained above, with the crystal resonator of the present invention, the capacitive element of the oscillation circuit, that is, the capacitor, which was conventionally placed outside the crystal resonator, can be easily incorporated. This saves space for elements and enables high-density mounting of electronic components. Furthermore, the number of parts for the user is reduced, contributing to improved reliability of the circuit. Furthermore, conventionally, a process of finely adjusting the oscillation frequency using a variable capacitor was required after mounting on a printed circuit board, but with the use of the crystal resonator of the present invention, the above adjustment process is no longer necessary, etc. The value above is great.

[Brief explanation of drawings]

Figures 1 a, b, and c are a plan view, a front sectional view, and a side sectional view showing an embodiment of the crystal resonator of the present invention, and Figures 2 a, b
, c are a plan view, a front sectional view and a side sectional view showing an embodiment of the airtight terminal used in the crystal resonator of the present invention, and FIG. 3 a
, b, and c are a plan view, front view, and bottom view showing an example of a capacitor used in the crystal resonator of the present invention, and a and b in FIGS. 4 and 6 respectively represent the crystal resonator of the present invention. FIG. 6 is a wiring diagram of the crystal resonator of the present invention, and FIG. 7 and FIG. b, c, and a are plan views and front views showing other embodiments of the capacitor used in the crystal resonator of the present invention. Bottom view and side view, each a of FIG. 8 and FIG. 10. b is a front sectional view and a side sectional view showing other embodiments of the crystal resonator of the present invention, FIGS. 11, 12, and 13.
Each figure a e b t' t ' is a plan view, a front view, a bottom view, and a side view showing other embodiments of the capacitor used in the crystal resonator of the present invention, and Fig. 14 a and b are the same as those in this book. A plan view and a front sectional view showing other embodiments of the airtight terminal used in the crystal resonator of the invention, and a and b in FIGS. 16 and 16, respectively.
, c are a plan view, a front view, and a side view showing each other embodiment of the crystal element used in the crystal resonator of the present invention, and FIG. 17a
, b are a plan view and a front view showing other embodiments of the crystal element used in the crystal resonator of the present invention, and a and b in FIGS. 22, 23, 24 and 25 are plan views and front sectional views showing other embodiments of the capacitor used in the crystal resonator of the invention.
Figures a and b are a plan view, a front cross-sectional view, and a 26th
Figures a and b in Figures 27 and 27 respectively show a plan view and a front view of other embodiments of the capacitor used in the crystal resonator of the present invention, and Figures a and b show a conventional crystal resonator. The front sectional view, side sectional view, and Fig. 29 are the conventional 1...
・Crystal element, 7. T'・・・Inner lead, 1
0.10', 11...Lead wire, 12
-...-Glass part, 13...Shell, 14...
... Cap, 16 ... Crystal oscillator, 19
・・・・・・Airtight terminal, 30・・・・・・Capacitor. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 5rl! J Fig. 7"IO Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 J Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 20 Fig. 21 (b) m <b>m Fig. 22 Figure 23 Figure 24 Figure 25 Figure 28 ((2) (b)

Claims (14)

[Claims] (1) A lead wire is inserted into an annular shell, and a plate-shaped capacitor, in which two capacitors are integrally formed, is held on the top surface of the glass part using an airtight terminal in which the lead wire is sealed in glass to the shell. A crystal resonator, characterized in that the crystal element is held substantially perpendicular to the main surface of the capacitor, and a metal cap is press-fitted into the airtight terminal to hermetically seal the capacitor and the crystal element. (2) The crystal resonator according to claim 1, wherein the capacitor has a substantially disk shape. (3) The crystal resonator according to claim 1, wherein the capacitor has a slit or a depression for holding a crystal element. (4) The crystal resonator according to claim 1, wherein the capacitor is a multilayer capacitor. (5) The crystal element is approximately rectangular and is chamfered or
The crystal resonator according to claim 1, wherein the crystal resonator is rounded. (6) The crystal resonator according to claim 1, wherein the crystal element has a tuning fork shape. (7) The crystal resonator according to claim 3, wherein the shape of the slit or the depression is substantially similar to the shape of the end portion in the longitudinal direction of the crystal element. (8) The crystal resonator according to claim 1, wherein the lead wires of the airtight terminals are arranged in a line. (9) The crystal resonator according to claim 1, wherein a substantially U-shaped holding portion is formed at the tip of the lead wire, and the crystal element is held in the holding portion. (10) The crystal resonator according to claim 1, wherein a flat part is formed at the tip of the lead wire, and the crystal element is held in the flat part. (11) The crystal resonator according to claim 1, wherein the capacitor is provided with a notch. (12) A crystal resonator according to claim 1, characterized in that longitudinal ends of the crystal element are fixed to the capacitor with an insulating adhesive. (13) The crystal resonator according to claim 1, wherein the longitudinal ends and inner leads of the crystal element are fixed to the capacitor with an insulating adhesive. (14) The crystal resonator according to claim 1, wherein the frequency-temperature characteristics of the crystal element are improved by utilizing the temperature characteristics of the capacitance of the capacitor.