JPS62241413A - Crystal resonator - Google Patents

Abstract

PURPOSE:To package electronic parts to high density by using an airtight terminal to which lead wires inserted into a metallic base are sealed with glass, holding a plate type capacitor where two capacitors are formed in one body and a crystal element almost horizontally, and mounting a metallic cap on the airtight terminal. CONSTITUTION:The crystal element 1 which has exciting electrodes 2 and 2' and lead-out electrodes 3 and 3' formed on the top and reverse opposite each other is inserted into a slit 4 and held mechanically by using conductive adhesives or solder materials 4 and 4'. Then while the crystal element 1 is oscillated through the lead wires 9, 9', and 10, metal is stuck on the exciting electrode 2 by vapor deposition, etc., and the oscillation frequency is adjusted to a specific value. Lastly, the metallic cap 16 is mounted on the airtight termi nal 15 and the plate type capacitor 30 where the two capacitors are formed in one body and the crystal element 1 are held almost horizontally and sealed airtightly. The capacitors of an oscillation circuit are easily incorporated by the crystal resonator to save its space, so electronic parts can be packaged to high density.

Description

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

BACKGROUND OF THE INVENTION The configuration of a conventional oscillation circuit using a crystal resonator includes a crystal resonator 23 and a capacitor 2, as shown in FIG.
4, a resistor 21, an inverter 22, and other components are individually arranged on the circuit board.

Figures 9a and 9b are a front sectional view and a side sectional view showing an example of a conventional crystal resonator.
9 , 19 ′ are inserted into the airtight terminal sealed by the glass portion 8 , and the holding portion 18 having a slit is
18' is formed at the tip of the inner lead 26°26', and an excitation electrode 2.
The crystal element 1 having the lead electrodes 3 and 3' and the lead electrodes 3 and 3' is inserted into the slit and mechanically held with conductive adhesive or solder 4 and 4', and the lead electrodes 3 and 3' and the holding part After electrically connecting terminals 18 and 18', a metal cap 16 was attached to the airtight terminal, and the terminal was 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 a metal base and the lead wire is sealed in glass to the base. A plate-shaped capacitor formed integrally with two capacitors and a crystal element are held substantially parallel to each other, and a metal cap is attached to the airtight terminal to hermetically seal the capacitor and the crystal element. It is.

Effect of the Invention The present invention has the above-described configuration, which allows the capacitive element of the oscillation circuit, that is, the capacitor, which was conventionally placed outside the crystal resonator, to be easily incorporated, thereby saving the space for the capacitive element. , it is possible to realize high-density packaging of electronic components. In addition, the number of parts for the user is reduced,
This also contributes to improving the 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. FIGS. 2a, b, and 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. ,
10 is inserted and sealed to the base with the glass portion 8. In addition, inner leads 12, 12
An inverted V-shaped holding portion 5.5' having two slits 14 is formed at the tip thereof. The above-mentioned holding part 6.
5' is fixed to the inner leads 12, 12' by welding or soldering, or is formed integrally with the lead wire using a press or the like. 3a, b, a, +1 show an embodiment of the capacitor used in the crystal resonator of the present invention; a plane view, a front view, a bottom view, and a side view; one electrode 32 on the main surface of and two electrodes 33.33' on the other main surface.
The figure shows a state in which two capacitors are formed on one substrate. Further, the capacitor 30 has a protrusion 34 . 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, in which the capacitor 3o is inserted into the slit 14 of the airtight terminal 16, Conductive adhesive or solder7.
7', mechanically held and capacitor 3
The electrodes 33 and 33' of the electrodes 33 and 33' are electrically connected to the holding parts 6 and 6', respectively.

Further, the protruding portion 34 of the capacitor 30 is mechanically held with a conductive adhesive or solder 6, and the electrode 32 of the capacitor 30 and the inner lead 13 are electrically connected. Next, the crystal element 1 having the excitation electrodes 2, 2' and the extraction electrodes 3, 3' formed opposite to each other on the front and back is inserted into the slit 14, and then glued with conductive adhesive or solder 4°4'. , mechanically held, and the extraction electrode 3.3' and the holding parts 6, 6'
are electrically connected to each other. Next, lead wire 9.9
', While oscillating the crystal element 1 through 10, metal is deposited on the excitation electrode 2 by vapor deposition or the like, and the oscillation frequency is adjusted to a predetermined value. At this time, the oscillation frequency is adjusted to absorb variations in the capacitance of the capacitor by 3 degrees, so the frequency accuracy is more restricted than in the past. lastly,
A metal cap 16 is attached to the hermetic terminal 16, and the capacitor 30 and the crystal element 1 are hermetically sealed.

Based on the above, a plate-shaped capacitor 30 formed by integrally forming two capacitors, and a capacitor with a wiring diagram shown in FIG. 4, which holds the crystal element 1 approximately in parallel and has improved frequency accuracy, are built-in. A crystal resonator 17 is formed.

In the above description, the crystal element 1 used in the crystal resonator of the present invention has been described as having a substantially rectangular flat plate shape, but the present invention is not limited to this shape. 6a, b, and c are a plan view, a front view, and a side view showing other embodiments of the crystal element 1 used in the crystal resonator of the present invention, and show the central part of the main surface of the substantially rectangular crystal element 1. A flat portion 61 is left, and the other portions are chamfered portions 62.

61i9a, b, and c are plan views, front views, and side views showing other embodiments of the crystal element 1 used in the crystal resonator of the present invention, in which the main surface of the approximately rectangular crystal element is rounded. It is. In addition, the fact that the crystal resonator of the present invention can be constructed using a crystal element 1 of any shape such as circular or square shape is as follows.
Needless to say.

7 and 8 are a partial front sectional view and a side sectional view showing a state in which the capacitor 3o is held in each of other embodiments of the airtight terminal 16 used in the crystal resonator of the present invention. In the figure, in order to hold the protruding part 34 of the capacitor 3o, a substantially U-shaped holding part 7 in FIG.
1, in FIG. 8, a flat holding portion 81 is formed.

In the above description, the case where the capacitor 30 has a substantially rectangular shape has been described, but the capacitor 30 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 or capacitor of the oscillation circuit, which was conventionally placed outside the crystal resonator, can be easily incorporated. Space for capacitive elements can be saved, and high-density packaging of electronic components can be realized. 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 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, and Figures 2a, b,
c is 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' *
b* c and el are a plan view, a front view, a bottom view, and a side view showing one embodiment of a capacitor used in the crystal resonator of the present invention, FIG. 4 is a wiring diagram of the crystal resonator of the present invention, and FIG. and a, b, and c in FIG. 6 are a plan view, a front view, and a side view showing other embodiments of the crystal element used in the crystal resonator of the present invention, and a, b, and c in FIG. 9b is a partial front sectional view and side sectional view showing a state in which a capacitor is held in each of the other embodiments of the airtight terminal used in the crystal oscillator of the present invention, and FIGS. 9a and 9b are examples of a conventional crystal oscillator. Front sectional view and side sectional view showing 1. FIG. 10 is a wiring diagram showing a configuration example of a conventional oscillation circuit. 1...Crystal element, 8...Glass part, 9
,9',10-...! j-)' line %11...
... Base, 13 ... Center inner lead, 16 ... Airtight terminal, 16 ... Cap, 17 ... Crystal oscillator, 3o ... ...
- Capacitor, 34... protrusion. Name of agent: Patent attorney Toshio Nakao and one other person
(4 WE3 Figure q' to q Figure 5 Figure 6 Figure 7 Figure 9 Figure 10

Claims (5)

[Claims] (1) Insert the lead wire into a metal base, use an airtight terminal with the lead wire sealed in glass to the base, and connect the crystal element and the plate-shaped capacitor, which is formed by integrating two capacitors, approximately parallel to each other. At the same time as holding the airtight terminal above,
A crystal resonator characterized in that a metal cap is attached to hermetically seal the capacitor and the crystal element. (2) The crystal resonator according to claim 1, wherein the capacitor and the crystal element are held in a pair of holding parts each having two slits. (3) The crystal resonator according to claim 1, wherein the capacitor has a protrusion. (4) The crystal element is approximately rectangular and is chamfered or
The crystal resonator according to claim 1, wherein the crystal resonator is rounded. (5) In order to hold the protrusion of the capacitor, a substantially U-shaped holding part or a flat holding part is formed at the tip of the center inner lead. The crystal resonator according to item 1.