JPS58125908A - Container of rectangular piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To realize an automated working process and at the same time to improve the airtightness of a container of a rectangular piezoelectric oscillator, by forming projected parts at both sides of a place where an insulated substrate contacts with a cover and then melting and adhering those projected parts to each other to facilitate the assembling work of the container and a piezoelectric oscillating plate while is stored to the container. CONSTITUTION:A depressed part 501 is formed on a main plane of one side of a rectangular insulated substrate 500 of thermoplastic resin, and lead terminals 200 and 300 are extended up to the cavity of the part 501 from both terminal faces in the lengthwise direction and fixed there. At the same time, exciting electrodes 102 and 103 and lead-out electrodes 104 and 105 are formed at both terminal faces and its both ends of a crystal oscillating plate 100 respectively. The plate 100 is set on the part 501 of the substrate 500, and the electrodes 104 and 105 are set on the terminals 200 and 300. In addition, a cover 600 is put over the opening part of the part 501. Then projected parts 603 and 508 are formed at both sides of a place where the substrate 500 contacts with the cover 600. These parts 603 and 508 are melted and adhered to each other. This facilitates the assembling work as well as to improve the airtightness of a container of a rectangular piezoelectric oscillator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a container for airtightly holding a rectangular piezoelectric diaphragm.

In order to maintain stable oscillation or resonance of the piezoelectric vibrator, this type of container is used by sealing nitrogen gas inside the container or by creating a vacuum, so airtightness is strictly required. Ru. In response to this demand, with the advent of soldering, resistance welding, and cold-open pressure welding airtight containers, we have reached a limit in our pursuit.

On the other hand, as a relatively inexpensive airtight container, there is an airtight container that consists of a base with an oval-shaped plane and a lid that fits and inserts the outside surface of the base with the inside surface to cover it, both of which are molded from Sh5Koshi resin. However, although this method attempts to bond the contact area between the outer surface of the base and the inner surface of the lid by high-temperature heating, the bond cannot be made all around the circumference, and even though it is an airtight container, the airtightness is compromised. The first object of the present invention is to provide a container for a rectangular piezoelectric vibrator with improved airtightness, and the second object is to provide a container for a rectangular piezoelectric vibrator with improved airtightness. It is an object of the present invention to provide a container for a rectangular piezoelectric vibrator, which facilitates assembly work with a piezoelectric vibrating plate to be held, enables automation thereof, and reduces the cost of the piezoelectric vibrator.

Hereinafter, the present invention will be explained in detail by taking up a crystal diaphragm as a piezoelectric diaphragm with reference to embodiment drawings. The figure (0) is a Φ plane view. The crystal diaphragm 100 is
The center portion 1 of both main surfaces of the rectangular AT; cut crystal plate 101
Excitation electrodes 10 to be vibrated through thickness shear, facing each other
2, lo3 and extraction electrodes 104° and 105 drawn out from the excitation electrodes 102 and 103 in mutually opposite longitudinal directions through the periphery and the end face to the opposing periphery, and serve these electrodes 102 to 103. 105 is formed by vacuum deposition of metal such as gold or silver. The thickness of this crystal plate 101 with end faces in the longitudinal direction decreases tJs as it advances towards the end faces. ν) So-called bevel processing is applied to enhance the energy confinement effect under the excitation electrodes 102 and 103. There is. Drawer type @101+,
The width of the end portion 105 is made as wide as the convergence of the crystal plate 101 in order to ensure conductive adhesion.

FIG. 2 is a front view of the lead terminal. Since the lead terminals 200 and 300 are connected by a common holding part 400, a predetermined number of lead terminals are integrally formed by press working. - "The material of the terminals 200 and 300 is
A metal having a thermal expansion coefficient approximately equal to the thermal expansion coefficient of the insulating substrate 500 described later, in this example, yellow copper (thermal expansion coefficient: 1.8 to 2.3 x 10 /de)
g) is used. And Tonori-r terminal 200
, 300 are shaped like connection ends 201 that are equiformly connected to the extraction electrodes 104 and 105 of the crystal diaphragm 100 described above.
301, an elastic part 202 in which cuts are formed alternately,
302, a stock 303 which is embedded in an insulating substrate 500 to ensure tensile strength, and an external terminal portion 204 and 304.

The insulating substrate 500 is shown in the front view of FIG.
), as shown in the A-A cross-sectional view of
) is basically a rectangular plate, and from its upper main plane is formed a recess 501 having a similar shape to the rectangular plate and having a relatively small) rectangular opening; At the bottom of the recess/location 501, the above-mentioned L-shaped IJ-Fi element 200 is exposed. -R terminal 2 to the inner surface of
203 and 303 are buried and fixed through the stems of 00 and 300. The material of the insulating substrate 500 has cohesive force,
It is a thermoplastic resin with characteristics such as adhesive strength, flexibility, and compatibility with other resins.
ψ) using ε). Inside the recess 501 are step surfaces 502 and 503 on which Phthalo 00, which will be described later, is placed.

504 and 505 are formed at each of the four corners, and above the recess 501 of the insulating substrate 500, a groove 506 is formed inside near the outer periphery along the periphery of the recess 501.
A convex portion 508 is formed between P4506 and the inner surface of the recess 501, projecting upward from the bottom of the groove 506 to the upper main plane 507, and becoming thinner toward the tip. As a modification of this convex portion 508, the upper main plane 5 has a constant thickness.
Although the formation of grooves 506 is optional, the finish of melting and fixing using a hot plate, which will be described later, will be better if grooves 506 are formed on the grooves 07.

) It may be a protruding piece with a certain thickness, but the thickness is preferably about 1 to 2 mm from the viewpoint of melting.X/).

Phthalo 00 is a rectangular plate that fits into the inner surface of the recess 501 of the insulating substrate 500, as shown in the front view of FIG. 4(A) and the AA cross-sectional view of FIG. , its material is also molded from polycarbonate resin, similar to the insulating substrate 500 b). Grooves 60 are also formed along the periphery of Phthalo 00 near the outer periphery symmetrically with the grooves 506 of the insulating substrate 500.
1 is formed, and between this I 601 and the outer surface of Phthalo 00, similar to the convex portion 508 of the insulating substrate 500, a groove 601 protrudes higher than the top surface 602 of Phthalo 00 from the bottom surface of the groove 601.
A convex portion 603 is formed that becomes thinner toward the tip. The modified example of this convex portion 603 is also similar to that of the convex portion 508 described above. As shown, Lee “
Terminal 200, 3007F) Connection end 201, 301
(7) is placed on top of the lead electrode 104, 1.05 with both ends thereof aligned, and conductive adhesive 701,
702 (this example: product name "F-Tight" Moshoku Kasei) was applied to the connection points between the two, and eventually the crystal diaphragm 1.00 beam - r terminals 200 and 300 were used to connect electrically and mechanically at two points. It is glued to the surface.

As shown in the front view of FIG. 6(A) and the A-A cross-sectional view of FIG.
505, the inner surface of the convex portion 508 of the insulating substrate 500 and the outer surface of the convex portion 603 of Phthalo 00 are in contact, and this mutually contacting portion is heated by contacting the hot plate 800 from above,
Both protrusions 508 and 603 are melted. The heating temperature at this time is 30° below the melting point of the insulating substrate 500 and Phthalo 00.
~100 deg higher temperature is preferred, in this example 300 deg higher temperature
'C. Regarding this heating effect, the convex portion 508
Due to the structure of ゜603, the amount of heat at the tip is relatively small and it can be easily melted.Furthermore, once melting starts, the convex portions 603, 5 of the next layer (lower layer)
The parts 08 are melted one after another, and most of the parts where the two touch each other are melted. This melted portion is released from the hot plate 80o and left to stand at room temperature to be fixed. In addition, in order to prevent sticking with the hot plate 800 during melting, it is effective to apply a differential coating to the abutting part of the hot plate 800 or to interpose a heat-resistant non-adhesive sheet such as Teflon between the two. It is.

The fused and fixed container accommodates and holds the crystal diaphragm 100 to form an airtight container, as shown in the front view of FIG. In addition, the lead terminal 200
, 300 outside ([lf!lo4.304 is separated from the common holding part 400 after assembly is completed.

Since the present invention has the above structure, airtightness can be ensured by melting the insulating substrate and the lid, and this airtightness is tested by immersing it in water heated to 1006G. It fully passed the so-called boiling test.

Further, the assembly work of the crystal diaphragm into the insulating substrate is very easy because it can be completed by placing it in a recess and applying a conductive adhesive, and it can also be automated.

Furthermore, in the present invention, an elastic part is formed on the -r terminal on which the crystal diaphragm is placed, and the position of this elastic part is determined between the penetration solidification part of the insulating substrate and the bonding part of the crystal diaphragm. ,
The thermal expansion coefficient of the crystal diaphragm (50.7~1.3 x 10/deg) and the material of the insulating substrate (this example: polycarbonate resin 2~53 x 10/deg) are used. However, stress due to thermal expansion and contraction due to the difference in thermal expansion coefficients between the two can be released through the elastic portion. As a result, the crystal diaphragm is
Even if it is firmly adhered to the terminal, it is possible to eliminate the influence of the temperature characteristics of the support system, to allow the original frequency temperature characteristics of the crystal resonator to appear, and to prevent the accidental peeling of the conductive adhesive portion.

In the above embodiments, polycarbonate resin was used as the thermoplastic resin material for the insulating substrate and the lid, but other examples of materials include Echireshi! Acidinyl copolymer (EVA), ethylene-ethyl acrylate copolymer (APP), ethylene-ethyl acrylate copolymer (EEA), polyester F, polyester, polyphenylene sulfide F (PPS),
Kisunii F (PPO), polybutylene terephthalate (P
BT), etc.

In addition to the crystal diaphragm, other piezoelectric diaphragms include lithium/talate, lithium niobate, and piezoelectric t5mic, and the shape of the elastic part is alternately slit-like cuts, but there are others. semicircle, triangle (V-shape), U
It may be a cut in the shape of a letter or the like. Furthermore, in the present invention, the rectangular shape of the 05 insulating substrate, the lid, and the piezoelectric plate is not defined as a rectangular shape in a strict geometric sense, but is essentially a rectangular shape of two orthogonal sides on the main plane. Among the dimensions, one side is longer than the other side, and additional shapes such as 8-sided machining on the four corners and semicircular machining (oval shape) on both end faces are also available. Naturally included.

[Brief explanation of the drawing]

FIG. 1 shows a crystal diaphragm which is an embodiment of the piezoelectric diaphragm of the present invention, and FIG. 1(A) is a front view and FIG. 1(A) is a side view. FIG. 2 is a front view showing an embodiment of the glue-r terminal of the present invention. FIG. 3 shows an embodiment of the insulating substrate of the present invention, and FIG. 3(A) is a front view and FIG. 3(0) is a sectional view taken along line A-A. FIG. 4 shows an embodiment of the lid of the present invention.
A) is a front view, and (0) is a sectional view taken along line A-A. FIG. 5 shows an embodiment in which a crystal diaphragm is placed within an insulating substrate, and FIG. 5(a) is a front view and FIG. 5(0) is a sectional view taken along line A-A. Figure 6 shows an embodiment in which the insulating substrate is covered with a lid, where (a) is a front view and (0) is an A-
It is an A sectional view. FIG. 7 shows an example of a container for a rectangular crystal resonator after the insulating substrate and both convex portions of the pufferfish are melted and fixed,
The same figure (a) is a front view, and the same figure (b) is an AA sectional view. 100...Crystal diaphragm, 101.0.Crystal plate, 102
. 103ψ--excitation electrode, 104, 1.05,...
Extracting electrode, 200, 300...Lead terminal, 50
0φ...Insulating substrate, 501--Concavity, 508...Protrusion, 600. .・Lid, 603...Protrusion, 701, 702...-
conductive adhesive

Claims (1)

[Claims] (1) A recess is formed from one main plane of a rectangular insulating substrate made of thermoplastic resin, and a REET terminal is passed through and fixed from both end surfaces of the insulating substrate in the longitudinal direction to the empty space of the recess, respectively. , a piezoelectric diaphragm exposed in the void space and comprising an excitation electrode and an extraction electrode extended from the excitation electrode to the periphery in the longitudinal direction is disposed on both sides of a rectangular piezoelectric plate. A lid made of thermoplastic resin is placed on the portion, conductively connects the front-r terminal and the extraction electrode, and has an outer surface that contacts above the inner surface of the recess of the insulating substrate. Absolute: A container for a rectangular piezoelectric vibrator, characterized in that it is covered from the opening of the recess of the substrate, and the convex portions formed on the insulating substrate and the lid that are in contact with each other are melted and fixed. .