JPH066595Y2 - Piezoelectric oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a piezoelectric oscillator in which an oscillation circuit and a piezoelectric piece are enclosed and integrated in a single container.

[Technical background of the invention] Conventionally, a piezoelectric oscillator, for example, a crystal oscillator, has been used by connecting a crystal piece formed with electrodes to a case made of metal or the like and connecting the case to an oscillation circuit. . Recently, however, there has been a great demand for miniaturization of electronic devices, and piezoelectric vibrators are no exception. Therefore, it has been considered that the piezoelectric vibrator and the oscillation circuit are integrally housed in a case to reduce the size and improve the reliability.

In such a case, for example, as shown in FIG. 6, a metal base 9 is fitted on the outer periphery of a substrate 8 made of an insulating material such as ceramic, and the lead wire 10 is held by the substrate 8. Then, a conductive pattern having a predetermined shape (not shown) is formed on the substrate 8, and the small electronic component 11 is soldered to this pattern to form an oscillation circuit. Then, on the substrate 8,
A plurality of bases 12 are provided, a crystal piece 13 is placed on the tip of the base 12, held by solder, a conductive adhesive, or the like, and connected to the oscillation circuit.

[Prior Art and its Problems] However, in such a case, the crystal piece 13 is relatively rigidly held by the substrate 10, and there is a problem in vibration resistance and impact resistance, and it is particularly difficult to carry it. In some cases, the crystal blank 13 may be damaged by vibration or the like.

[Object of the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a piezoelectric oscillator having excellent vibration resistance and shock resistance and excellent vibration characteristics.

[Summary of the Invention] The present invention provides a holding member having a base portion facing a plate surface of a substrate having an oscillation circuit formed on the plate surface, and a pair of leg portions protruding from the base portion and having tips attached to the substrate. It is characterized in that the piezoelectric piece is held by the base portion of the holding member.

[Embodiment of the Invention] One embodiment of the present invention will be described in detail with reference to the assembly perspective view shown in FIG. That is, in this embodiment, a predetermined conductive pattern 1A is formed on the plate surface of a substrate made of an insulating material such as ceramic shown by reference numeral 1 in the figure. The conductive pattern 1A has circuit elements, that is, passive elements 2A such as resistors and capacitors, and active elements 2B such as ICs and transistors.
Are attached with solder, a conductive adhesive, or the like. A lead wire 3 for connecting to the outside is planted on the substrate 1.

Reference numeral 4 denotes a holding member, which is formed by processing a thin metal plate having conductivity, and which has a base portion 4A facing the plate surface of the substrate 1, a pair of arm portions 4B protruding in parallel from both end portions of the base portion 4A, and It has an arcuate holding arm 4C for holding that projects from the central portion of the base portion 4A on the same plane. The base portion 4A of the holding member 4 is provided with a notch so that the substantial length of the base portion 4A is lengthened to increase springiness and buffer stress and heat. Then, the pair of holding members 4 are attached to the conductive pattern of the substrate 1 by soldering, a conductive adhesive or the like so that the tips of the legs 4B are attached so that the holding arms 4C face each other. Then, on the plate surface of the holding arm 4C on the substrate 1 side, the outer peripheral edge portion of the crystal piece 5 on which the folded electrode is formed is attached and held by solder, a conductive adhesive, or the like.

Therefore, the crystal piece 5 is attached to the lower surface of the holding member 4 shown in FIG. Then, the electrodes of the crystal piece 5 are connected to the conductive pattern formed on the substrate 1 via the holding member 4.

Then, the substrate 1 is covered with a cover 6, and the inside is filled with vacuum or an inert gas to hermetically seal it.

With such a configuration, the crystal piece 5 is held by the holding member 4 via the base portion 4A and the holding arm 4C. The base portion 4A is provided with a notch so that the base portion 4A has a substantially long length to increase the spring property. Since the heat propagation path also becomes longer, it is possible to reduce the thermal influence, and it is possible to prevent damage to the crystal blank 5 and deterioration of the characteristics due to these.

Further, since the holding arm 4C protruding from the base 4A of the holding member A is formed in an arc shape to hold the outer peripheral edge of the crystal piece 5, the holding arm 4C against the mechanical stress from the outside. A swinging effect can be obtained centering on the base end of 4C, the shock can be efficiently buffered, and the influence of the stress from the holding structure on the crystal piece 5 can be reduced, and good vibration characteristics can be obtained.

Therefore, it is possible to provide a piezoelectric oscillator having excellent vibration resistance and impact resistance.

In this embodiment, the crystal piece 5 is held by the holding arm 4C.
Since it is attached to the board surface of the substrate 1 side, it is possible to prevent, for example, a conductive adhesive from coming into contact with the case 6 to cause an electrical short circuit due to an external impact.

The present invention is not limited to the above embodiment,
For example, the holding member 4 may have a plan view shown in FIG. 2 and a front view shown in FIG. That is, in this case, the through hole 8 is bored in the central portion of the base portion 4A of the holding member 4 to enhance the spring property of this portion.

Further, in the present embodiment, the holding arm 4C is provided so as to project from the base portion 4A to hold the crystal piece 5, but, for example, as shown in FIG. Crystal piece 5
Needless to say, even if both end portions are held, vibration resistance and impact resistance can be improved by the elasticity of the base portion 4A.

Further, as shown in FIG. 4, a through hole 9 may be formed at the tip of the leg portion 4B of the holding member 4. By doing so, when attaching the tip of the arm portion to the substrate, solder, a conductive adhesive or the like also flows into the through hole 9, so that the attachment can be performed more strongly.

In the above embodiment, the arcuate holding arm is used in accordance with the outer shape of the crystal piece, but the present invention is not limited to such an example, and in correspondence with the shape of the crystal piece, for example, a square It is needless to say that it can be implemented appropriately, such as a straight line.

[Effect of the Invention] As described above, according to the present invention, the vibration resistance and the shock resistance are excellent,
It is possible to provide a piezoelectric oscillator that can obtain good vibration characteristics.

[Brief description of drawings]

1 is an assembled perspective view showing an embodiment of the present invention, FIG. 2 and FIG. 3 are plan views showing another embodiment of the present invention,
FIGS. 4 and 5 are side views showing still another embodiment of the present invention, and FIG. 6 is an assembled perspective view showing an example of a conventional piezoelectric oscillator. 1 ... Substrate 2A ... Passive element 2B ... Active element 4 ... Holding member 4A ... Base 4B ... Leg 4C ... Holding arm 5 ... Crystal piece 6 ... Case

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric oscillator in which a holder is provided on a substrate made of an insulating material on which a circuit pattern is formed to hold a disc-shaped piezoelectric piece and a circuit element is mounted, wherein the holder is A base portion facing the plate surface of the substrate and having a through hole for increasing springiness, and an arc-shaped holding arm protruding from the central portion of the base portion so as to face each other and attaching the peripheral edge portion of the piezoelectric piece. A leg portion projecting from both ends of the base portion and erected on the substrate and provided with a through hole at a tip end thereof, and solder or a conductive adhesive is introduced into the through hole to be fixed to a circuit pattern of the substrate; A piezoelectric oscillator characterized by being formed from