JPH0233212A - Insulation plate and piezoelectric vibrator - Google Patents

Abstract

PURPOSE:To improve the working performance by forming an insulation plate in which slits receiving lead wires led from a metallic base in the orthogonal direction are provided from one side face and mounting the insulation plate to a bottom face of the metallic base of a crystal vibrator. CONSTITUTION:A crystal chip 2 is supported to a supporter 4 stood onto the metallic base 3 with a couple of lead wires 8 led out therefrom and the metallic cover 5 is sealed. Then the insulation plate 12 is mounted to the bottom face of the metallic base 3. The insulation plate 11 is made nearly to be the same shape as that of the bottom face of the metallic base 3 and a couple of notches 12 are provided in parallel from one side face in the lengthwise direction. Then the width of an open end is selected larger than the diameter of the lead wire 6 to form a guide part 14. Then the guide part 13 is inserted to the insulation plate 11 from a direction orthogonal with respect to the leadout direction of the lead wires 6, a fixed part 14 is pushed in and the plate 11 is mounted onto the bottom face of the base 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention is applied to a piezoelectric vibrator, and particularly relates to an insulating plate for preventing electrical contact between a crystal vibrator and a circuit board.

(Background of the Invention) Since crystal resonators have excellent resonance characteristics, they are often used as oscillators and filter elements in various electronic devices, especially communication devices. In recent years, an insulating plate has been provided between the crystal resonator and the circuit board to avoid electrical continuity due to high-density packaging. In addition, in the case of products for consumer use, there are products in which a crystal resonator is attached to a carrier tag and taped to facilitate automatic attachment to a circuit board.

(Prior Art) FIG. 5 is a diagram of a crystal resonator showing one conventional example of this type.

The crystal oscillator 1 is held by electrically and mechanically connecting a crystal piece 2 to a supporter 4 erected on a metal base 3. Then, the metal cover 5 is sealed by resistance welding or cold pressure welding.

A pair of lead wires 6 are led out from the bottom surface of the metal base 3 for connection to an external circuit. Usually, an insulating plate 7 is provided on the bottom surface of the metal base 3 as shown in the cross-sectional view of FIG.
is provided to prevent electrical continuity with a conductive path (not shown) formed on the circuit board 8. The insulator 7 is made of, for example, a flat polyester. A through hole 9 is provided in which the lead wire 6 is inserted vertically into the plate surface.

(Problems with the Prior Art) However, in the crystal resonator 1 having the above configuration, the diameter of the through hole 9 is made smaller than that of the lead wire 6, so that the metal base 3
The insulating plate 7 was prevented from falling off from the bottom surface.

Therefore, 1 of lead wire 6! When inserting into the I through hole 9, the work was troublesome.

In addition, as shown in FIG. 7, especially when taping the crystal resonator 1 to which the insulating plate 7 is attached, the accuracy of the position i12 of the crystal resonator 1 relative to the carrier tape 10 is deteriorated, resulting in work efficiency. There was a problem with the decline.

That is, when taping the crystal resonator 1, generally the lead wires 6 are attached to the carrier tape 10 and lined up (
After that, it is wound onto a reel (not shown). At this time, from the side end a of the carrier tape 10 to the metal base 3
The interval d is set to a constant value according to specifications and the like.

In reality, taping is performed by keeping this distance d1 constant using an automatic attachment device. 17. If the insulating plate 7 as described above is attached to the bottom surface of the metal base 3, the carrier 1
The distance d2η between the side end a of the aperture 7-10 and the insulating plate 7 is equivalently constant (FIG. 8). Only (7, in reality,
The insulating plate 7 may be attached obliquely to the bottom surface of the metal base 3, for example, during insertion or during subsequent transportation and operation. Therefore, in such a case, the distance between the side edge a and the insulating plate 7 may be incorrectly measured, and the distance between the side end a and the insulating plate 7 may be incorrectly measured, and the distance between the side edge a and the metal base 3 may be measured at a constant value d according to the specifications.
1 (Figure 9). As a result, there was a problem in that the positional accuracy of the crystal resonator 1 with respect to the carrier tape 10 was deteriorated, and the reliability in the case of taping was compromised.

(Object of the Invention) The present invention provides an insulating plate that improves workability and is particularly suitable for a taped piezoelectric vibrator, and a piezoelectric vibrator fl-
The purpose is to provide W.

(Means for Solving the Invention) The present invention provides an insulating plate by arranging slits in parallel from one side to be inserted from a direction perpendicular to the lead wires led out from a metal base, and using this insulating plate. The solution is to configure a crystal oscillator. Hereinafter, the present invention will be explained in detail.

(Example) FIG. 1 is a diagram of a crystal resonator explaining an example of the present invention. Note that the same parts as those in the previous embodiment drawings are given the same numbers and the explanation thereof will be simplified.

In the crystal resonator 1, a crystal piece 2 is held on a savok 4 erected on a metal base 3 from which a pair of lead wires are led out in the same manner as described above, and a metal cover 5 is sealed. An insulating plate 12 is attached to the bottom surface of the metal base 3.

The insulating plate 11 is made of, for example, flat polyester and has approximately the same shape as the bottom surface of the metal base 3. Then, a pair of notches 12 are provided in parallel from one side in the longitudinal direction. This cut 12 is approximately V-shaped, and the open end of the letter 7 is on one side. Then, the open end has a width larger than the diameter of the lead cotton 6 and is used as a guide portion 13. Further, the closed end is formed into a narrow groove smaller than the diameter of the lead wire 6 to serve as the fixing portion 14 . Then, the insulating plate 11 is attached to the bottom surface of the base 3 by inserting the guide part 13 from a direction perpendicular to the direction in which the lead wires 6 are drawn out and pushing in the fixing part 14.

Therefore, in this type of device, the lead wire 6 is easily guided to the fixing portion 14 by the guide portion 13 without having to insert the lead wire 6te into the small through hole 9 as in the conventional example, thereby facilitating the work.

In particular, when taping the crystal resonator 1, for example, after making the distance mdt between the side end a of the carrier tape 10 and the metal base 3 constant as usual (see FIG. 7 above),
Since the insulating plate 11 may be mounted from the orthogonal direction as described above, problems such as misalignment of the crystal resonator 1 will not occur. Therefore, it is possible to improve its reliability even in such a case.

(Other matters) In the above embodiment, the pair of notches 1 of the insulating plate 1
2 is approximately V-shaped and the fixed part 14 at the closed end is simply a thin groove, but for example, as shown in FIG. 2, the fixed part 14 is made into a narrow groove 15 bent from the closed end, The lead wire 6 may be guided to further prevent its separation 11-. In addition, as shown in FIG.
For example, the tip may be made into an arc shape to prevent the lead wire 6 from coming off from one side. In addition, although the narrow groove that forms the figure 7-shaped fixing part 14 is made smaller than the lead latitude, it is not necessary to reduce its diameter when, for example, a crystal resonator is mounted on a circuit board. You can decide accordingly. In addition, as shown in FIG. 4, a similar cut is provided between a pair of parallel cut portions 12 to form an absorption groove 17, so that, for example, the distance between the fixed portions of the insulating plate 11 may have an error due to manufacturing or changes over time. Even if this error occurs, the error may be absorbed. The shape of the cuts 12 in this case does not pose any particular problem, and a plurality of cuts 12 may be formed from both sides. In this case, it is expected that the external force applied to the crystal resonator 1 through the lead cotton 6 will be reduced, thereby preventing deterioration of its characteristics.

In other words, the present invention can be modified as appropriate without departing from the spirit thereof, and basically the lead wire 6 can be
A device in which the insulating plate 11 is inserted and mounted from the notch 12 from the perpendicular direction is included within the technical scope of the present invention.

(Effects of the Invention) The present invention provides an insulating plate by arranging slits that are pushed in from the perpendicular direction to the lead wires led out from the metal base from one side of the Wii side, and attaching the slits to the bottom surface of the metal base of the crystal resonator. Since it is attached, it is possible to improve workability and increase reliability especially when taping a crystal resonator, and the practical effect is very large.

[Brief explanation of the drawing]

FIG. 1 is an exploded view of a crystal resonator equipped with an insulating plate, explaining one embodiment of the present invention. @ Figures 2, 3 and 4 are diagrams of insulating plates illustrating other embodiments of the present invention. FIG. 5 is an exploded view of a crystal resonator equipped with an insulating plate to explain a conventional example. FIG. 6 is a sectional view of the crystal resonator mounted on the circuit board, and FIG. 7 is a plan view of the crystal resonator mounted on the carrier tape. FIGS. 8 and 9 are plan views of a crystal resonator equipped with an insulating plate attached to a carrier arp. 1 Crystal unit, 2 Water piece, 3 Metal base, 4 Innovoke, 5 Metal cover 6 Lead wire, 7.11
Insulating plate, 8 circuit board, 9 through hole, 10 carrier tape, 12, notch, 13° guide part, 14, fixing part, 15 narrow groove, 16, narrow part, 17, absorption groove. 8th aa! $9 figure

Claims (2)

[Claims] (1) In an insulating plate for a piezoelectric vibrator, which is attached to the bottom surface of a metal base holding a piezoelectric piece from which a lead wire is led out, and is configured to prevent electrical conduction with a circuit board, the direction in which the lead wire is led out is 1. An insulating plate for a piezoelectric vibrator, characterized in that slits, which are inserted and mounted from a direction perpendicular to the piezoelectric vibrator, are formed in parallel from one side. (2) In a piezoelectric vibrator in which an insulating plate is laid on the bottom surface of a metal base from which lead wires lead out and hold a piezoelectric piece to prevent electrical conduction with a circuit board, the insulating plate is placed on one side. 1. A piezoelectric vibrator characterized in that the piezoelectric vibrator has slits arranged in parallel from each other, and is mounted by being inserted through the slit from a direction perpendicular to the direction in which the lead wire is led out.