JPS6011485B2 - Crystal oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crystal resonator, and more specifically, the present invention relates to a crystal resonator, and more specifically, fixing of a crystal resonator piece and a crystal resonator fixing member in the manufacture of a crystal resonator, and fixing of electrodes and external leads formed on the crystal resonator piece. It relates to electrical connections with terminals.

Crystal resonators are used in many fields because of their stable frequency. A crystal vibrating piece used in a crystal vibrator is provided with a vibration electrode, and the electrode is electrically connected to an external lead terminal. Also, the crystal vibrating piece is fixed in such a way that vibration cannot be prevented. Solder or a thermally effective adhesive is used to fix the crystal vibrating piece and the cotton vibrating piece fixing member, but if solder is used, solder must be applied to each of the crystal vibrating piece and the cotton vibrating piece fixing member. If you use a thermosetting adhesive, the curing time of the adhesive will be long, and the mutual position of the crystal vibrating piece and the crystal vibrating piece fixing part may shift until the adhesive hardens. A pick-up tool was needed to keep it in place, and mass production required a large number of jigs. An object of the present invention is to fix a crystal vibrating piece and a crystal vibrating piece fixing member in a short period of time.

Another object of the present invention is to simplify electrical connection between electrodes formed on a crystal vibrating piece and external lead terminals. The present invention will be explained in detail below.

In order to achieve the purpose of the present invention, an ultraviolet curable resin is used, and an ultraviolet curable resin is a resin that hardens by irradiation with ultraviolet rays, and a conductive ultraviolet curable resin is a resin that is electrically conductive to the ultraviolet curable resin. It contains particles or flakes of silver, copper, nickel, etc. as a conductor, and it also contains glass beads coated with silver as a conductor. The fixation between the crystal vibrating piece and the crystal vibrating piece fixing member will be explained. FIG. 1 is an exploded perspective view of a conventional tuning fork type crystal resonator applicable to the present invention, in which 1 is a closed container, 2 is a tuning fork type crystal vibrating piece, 3 is a crystal vibrating piece fixing member, and 4 is a base. . The crystal vibrating piece fixing member 3 is fixed at a predetermined position on the base 4, and the tuning fork-shaped crystal vibrating piece on which a predetermined electrode (not shown) is formed is fixed to the crystal vibrating piece fixing member with solder or other adhesive. Ru. However, when fixing with solder, at least one of the crystal vibrating piece fixing member 3 or the tuning fork crystal vibrating piece 2 must be soldered in advance, which requires so-called preliminary work, and heating is required to melt the solder. Must. Furthermore, since solder is used, there is a risk that the crystal resonator piece may come off due to remelting due to the heat generated when the terminals of the crystal resonator (not shown) are soldered to the circuit board. On the other hand, when fixing with adhesive, it takes a long time for the adhesive to harden, and a pick-up tool is required to position and fix the crystal vibrating piece and the crystal vibrating element until the adhesive hardens. , requires a large number of fixing jigs.
In the present invention, the drawbacks of the prior art are overcome by using an ultraviolet curable resin for fixing the tuning fork type crystal vibrating piece 2 and the crystal vibrating piece fixing member 3 shown in FIG. That is, an ultraviolet curable resin (adhesive) is applied to either the tuning fork type crystal vibrating piece 2 or the crystal vibrating piece fixing member 3, and the two are positioned and irradiated with ultraviolet rays. The irradiation time ranges from several seconds to several minutes for curing. (Additional reinforcing adhesive may be used if adhesive strength is required.) In this case, the crystal vibrating element fixing member 3 is made of a material that can transmit ultraviolet rays, such as glass, translucent ceramic, transparent or semi-transparent resin. If so, it is sufficient to irradiate ultraviolet rays from the side of the crystal vibrating element fixing member 3, and in the case of a member that does not transmit ultraviolet rays, this can be easily handled by selecting the electrode shape of the crystal vibrating element and the irradiation angle of the ultraviolet rays. In addition, if a conductive ultraviolet curable resin is used as the adhesive, it is possible to electrically connect the electrodes formed on the crystal vibrating piece and the crystal vibrating piece fixing member 3 while simultaneously forming a conductive pattern on the crystal vibrating piece fixing member. can do. In the example shown in FIG. 1, the crystal vibrating element fixing member 3 and the base 4 are separate bodies, but it goes without saying that they may be integrated. In addition, vacuum equipment such as vacuum evaporation, sputtering, and ion plating is used to form electrodes on crystal vibrating pieces, but these are expensive equipment and take a long time to form electrodes, so conductive ultraviolet curing resin is used. Electrodes can be easily formed by screen printing. As explained above, according to the present invention, the fixing and electrical connection between the crystal vibrating piece and the crystal vibrating piece fixing member, and the connection between the electrodes formed on the crystal vibrating piece and the external lead terminals are extremely easy and can be performed in a short time. In addition to this, fewer jigs are required for these operations, and thus inexpensive crystal resonators can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the tuning fork type crystal of the invention. 1... Airtight container 2... Tuning fork type crystal vibrating piece, 3... Crystal vibrating piece fixing member, 4... Base.

Claims (1)

[Scope of Claims] 1. A crystal consisting of a crystal vibrating piece with electrodes formed on its surface, a base having a fixing part for the crystal vibrating piece, a container for airtightly sealing the crystal vibrating piece, and an external lead terminal. A crystal resonator, characterized in that the crystal vibrating piece and the fixing part are fixed with an ultraviolet curing resin. 2. A crystal resonator consisting of a crystal vibrating piece having electrodes formed on its surface, a base having a fixing part for the crystal vibrating piece, a container for airtightly sealing the crystal vibrating piece, and an external lead terminal. A crystal resonator characterized in that the electrical connection between the electrode of one piece and the external lead terminal is made of conductive ultraviolet curing resin.