JPH0749855Y2 - Flat type piezoelectric container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Purpose of the Invention> [Industrial Field of Application] The present invention relates to a container for a flat type piezoelectric vibrator for surface mounting with improved airtightness.

[Prior Art] Piezoelectric oscillators, especially quartz oscillators, are widely used as signal sources and oscillation sources. Recently, surface mount type piezoelectric vibrators have been widely used. FIG. 3 is a sectional view of a conventional flat type piezoelectric vibrator container. A conductive portion is provided on the base 1 of the ceramic substrate, and the crystal oscillation plate is fixed to the support. Note that the crystal unit and the support are omitted in this figure. Ceramic is also used for the lid 2, and low-melting glass is used for hermetically sealing the base 1. The glass melts and is fixed by overheating to a high temperature, but this low-melting glass spouts to the outside. This is because the temperature in the heating process for hermetically sealing becomes high, the gas inside expands, and there is a risk that the glass will blow out from the low melting point glass portion toward the outside due to unevenness.

[Problems to be solved by the invention] Therefore, in order to prevent the adhesive glass from spouting outside, a method of making the amount of glass uniform and increasing the amount of glass is conceivable, but the amount of glass is large. In this case, the excess glass jumps out inside or outside the container, so that the appearance becomes undesired and the excess glass may be caught on the conductive portion.

[Object of the Invention] An object of the present invention is to provide a flat type piezoelectric vibrator having a structure in which glass for adhesion does not squirt outside when hermetically sealed.

<Structure of the Invention> [Means for Solving the Problems] In order to achieve the above-mentioned object, the invention has an inclined bottom surface to prevent the glass from being spouted to the outside even if the internal pressure increases.

[Operation] In the present invention, pressure is applied from the top of the lid when sealing, but the pressure inside the container rises and the glass tends to come out, but since the bottom of the lid is inclined, The glass is hard to come out.

[Embodiment] FIG. 1 is a cross-sectional view showing a cross section of a piezoelectric vibrator container of the present invention. A conductive part made of silver palladium or the like is printed and baked on a substrate made of ceramic to form a base 1, a support is fixed to the conductive part, and a piezoelectric vibrating plate is fixed to the support. In this figure, the piezoelectric vibrating plate, the support, and the conductive portion are omitted.
The lid 2 and the base 1 made of ceramic are fixed by the low melting point glass 3 and hermetically sealed.

In the present invention, the bottom surface of the lid 2 is inclined so that the lid and the base are close to each other on the outer side of the container, and the distance between the base and the base gradually increases toward the inside of the container. By doing this, when heating at high temperature to fix the lid, the lid heats while applying pressure from the upper part, but when the low melting glass softens, the internal pressure is the heating temperature and the pressure from the upper part If the upper pressure is low, the low-melting glass will blow out from between the base and the lid toward the outside of the container, but if the bottom surface of the lid is inclined, the resistance of the low-melting glass to pass through a narrow gap is high. Because it is large, it is difficult to go outside.

2 (a), (b), (c), and (d) are partially enlarged cross-sectional views of the bottom surface of the lid, and the inclination of the bottom surface of the lid makes the gap wide inside the container and narrows outside the container. There is. The low melting point glass is omitted in these figures.
The angle θ shown in FIG. 2 (a) is set to 2 to 30 degrees as required. In each figure of FIG. 2, the arrow indicates the inside of the container.

According to the present invention, the low-melting-point glass generated in the container for the flat type piezoelectric vibrator is prevented from being blown out to improve the airtightness.

The piezoelectric body is not limited to crystal, but may be lithium tantalate or piezoelectric ceramic.

<Effects of the Present Invention> The present invention has realized a highly reliable container for a flat-type piezoelectric vibrator, which eliminates the glass spouting that frequently occurs in the conventional sealing, improves the airtightness, and is highly reliable.

[Brief description of drawings]

FIG. 1 is a sectional view of a container for a flat type piezoelectric vibrator of the present invention, FIGS. 2 (a), (b), (c), and (d) are partial sectional views of the lid bottom surface, and FIG. It is sectional drawing of the conventional container for crystal oscillators. 1 ... Base, 2 ... Lid, 3 ... Low melting glass

Claims (1)

[Scope of utility model registration request] 1. A flat type piezoelectric vibrator container in which a base on which a piezoelectric vibrating plate is mounted and fixed and a lid are softened and fixed by heating glass is fixed, and a bottom surface of the lid is inside from outside. Has a slope away from the base.