JPS61145919A - Crystal resonator - Google Patents

Abstract

PURPOSE:To attain ease of automation of the manufacturing process and to obtain a crystal resonator with less performance variance by holding the crystal resonator to a holder formed in a way that the 2nd holding member having a closed loop is enclosed by the 1st holding member of channel shape made of a metallic plate on a plane. CONSTITUTION:The holder is formed by press processing or etching processing of a metallic plate and the 1st holding member 21 of channel shape encloses the 2nd holding member 22 having a closed loop. The crystal element 33 is placed on the holder, a conductive adhesives 34 is applied and cured by heating to hold mechanically the element 33, the exciting electrode 35 at the front side is connected to the holding member 31 and the exciting electrode at the rear side is connected to the holding member 32 electrically respectively. Then, the holders 43, 44 are clipped at the edge 42 of a case 41 made of glass or ceramic, bonded by a low melting point glass to form the crystal resonator sealed air-tightly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a crystal resonator used in an oscillation circuit of wireless 2 communication equipment and the like.

2. Description of the Related Art Conventionally, the crystal element of a quartz crystal resonator, particularly the commonly used five-T cut crystal resonator, has been supported by wire supports, plate spring supports, or the like. 10th
Figure & is an example of a wire-supported crystal resonator.
A crystal element 3 is sandwiched and held between a coiled end portion 2 of a piano wire 1. FIG. 10 shows an example of a plate spring support type crystal resonator, in which a metal plate spring 4 is provided with a slit 6, and the end of the crystal element is inserted into the slit and held.

Problems to be Solved by the Invention However, the work of assembling the crystal element onto these conventional holding devices is difficult to automate and must be carried out by skilled workers. In addition, since the assembly is done by hand, the holding member may be deformed during assembly, or the crystal element may not be held in a fixed position, resulting in variations in performance.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a structure in which a U-shaped first holding member made of a metal plate holds a second holding member having one closed loop on the same plane. To provide a crystal resonator characterized in that a crystal element is held in a holding device formed to be wrapped in a container, and a container is hermetically sealed by adhering a container from the front and back with the holding device sandwiched therebetween.

Effect of the present invention With the above-described configuration, the manufacturing process can be easily automated, and the crystal element can be held in a fixed position without deformation of the holding member when assembling the crystal element, thereby eliminating variations in performance. It becomes possible to produce crystal resonators with less

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 2a and 2b are plan views showing an embodiment of the holding device used for the crystal resonator of the present invention, in which a metal plate is pressed or
It is formed by etching or the like. A U-shaped first holding member 21 is formed to wrap around a second holding member 22 having one closed loop. Third
Figures a and b show that by placing a crystal element 33 on this holding device, applying a conductive adhesive 34, and curing it by heating, the crystal element 33 is mechanically held and the excitation electrode 36 on the front side is , is a plan view showing a state in which the holding member 31 and the excitation electrode (not shown) on the back side are electrically connected to the holding member 32, respectively.

Next, as shown in FIGS. 1a and 1b, holding devices 43 and 44 are sandwiched between the ends 42 of a case 41 made of glass or ceramic, and the crystal oscillator is hermetically sealed by bonding with low melting point glass or the like. It is formed. Because of the structure in which the distances from the fixing parts 46° 46 between the holding device 43, 44 and the case 41 to the positions 47, 48 where the crystal element 49 is bonded are lengthened, mechanical stress applied to the crystal oscillator from the outside or , a crystal oscillator with stable performance can be obtained, with an effect of relieving thermal stress.

In a crystal resonator having this holding device, by connecting a large number of holding devices, it is possible to easily automate the assembly of the crystal element. That is, as in the example shown in FIG. 4, a large number of holding devices 51 of the present invention are connected by a frame 52 by pressing, etching, or the like. Additionally, a guide hole 63 for automatic feed is provided. Since this structure is formed in one plane, extra steps such as bending are not required, and it is suitable for mass production. Next, as shown in FIG. 6, a conductive adhesive 61 is applied to the dispenser 6.
2, the frame is automatically fed by one stroke, and the crystal element 64 is sucked with the Airsec 65 and placed in a predetermined position. Thereafter, the conductive adhesive is heated and cured in a drying oven. Next, the frame 67 is separated from the separation part 66 of each holding device, and the frame 68 is used as a common terminal to enable each crystal resonator to oscillate. Next, the crystal oscillator connected by the frame 68 is set in the vacuum deposition tank,
Gold, silver, or the like is deposited on the excitation electrode to adjust the oscillation frequency. Thereafter, as shown in FIG. 6, the holding device is sandwiched from the front and back by a case 71 made of glass or ceramic under nitrogen or vacuum, and hermetically sealed by bonding with low melting point glass or the like. Finally, the frame 68 is separated from the separation portion 72 to obtain individual crystal oscillators 73.

Next, the performance of the crystal resonator of the present invention will be explained. As a specific example, the crystal element was a flat plate with a square shape of 6IIm square and a thickness of about 0.12 mm, and the required excitation electrodes were formed by vapor deposition. The oscillation frequency at this time is approximately 14M
It was Hz. FIG. 9 is a diagram showing the temperature characteristics of this crystal element hermetically sealed with the holding device of the present invention. FIG. 9a is a diagram showing the temperature characteristics of the oscillation frequency, and shows the smooth characteristic of a cubic curve characteristic of a whip-cut crystal resonator. FIG. 9 is a diagram showing the characteristics of crystal impedance, which indicates oscillation elasticity, and is in a very stable state against temperature changes.

As described above, by using the holding device of the present invention, it is possible to easily automate the manufacturing process from assembly to sealing, and to produce a crystal resonator that is highly mass-producible.

Next, other embodiments of the present invention will be described with reference to the drawings.

In the embodiments described above, the case where the crystal element is square has been described, but the holding device of the present invention can be applied to cases where the crystal element is not limited to square, but is circular, rectangular, or any other arbitrary shape. In addition, the number of terminals is not limited to four, but two.
Books are also possible.

As shown in FIG. 7a, by bending the terminal 81 twice at right angles, a chip-shaped crystal resonator 82 is easily formed.
Figure 8 shows an example in which the holding device of the present invention is applied to a rectangular crystal element, which was impossible to do with a conventional crystal resonator by making it into a taping carrier shape as shown in Figure J. Even if the child is made smaller, it still shows its effectiveness.

Effects of the Invention As described above, the present invention provides a holding device in which a U-shaped first holding member made of a metal plate wraps a second holding member having one closed loop in the same plane. By holding the crystal element in the holder and hermetically sealing the holding device by gluing the container from the front and back, automation of the manufacturing process can be easily realized, and the crystal oscillation has excellent stability in oscillation frequency and oscillation intensity. Can produce children.

[Brief explanation of the drawing]

1A and 1B are a plan view and a side view showing an embodiment of the crystal resonator of the present invention, and FIGS. 2A and 2B are U-shaped first holding members made of metal plates used in the present invention. A plan view showing an embodiment of a holding bag consisting of a second holding member having one closed loop, and FIGS. 3a and 3b show a state in which a crystal element is placed on a holding device used in the present invention. 4 is a plan view showing an embodiment of the frame structure of the holding device used in the present invention, and FIG.
, b and C are a plan view showing another embodiment of the holding device used in the present invention, a plan view showing the state before hermetically sealing, and a perspective view showing the state after hermetically sealing, FIGS. 9a and b 10 is a diagram showing the temperature characteristics of a crystal resonator according to the present invention, and FIGS. 10a and 10b are a plan view and a perspective view showing a conventional holding structure for a crystal resonator. 21.31.43.91...First holding member,
22.32.44.92... Second holding member,
33°49.64,69.93...Crystal element,
41.71... Container, 73.82.96...
...Crystal resonator, 61...Holding device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5 Figure 6 Figure 7 (d) θl Figure 8

Claims (1)

[Claims] A crystal element is held in a holding device in which a U-shaped first holding member made of a metal plate wraps a second holding member having one closed loop in the same plane, and the holding device is A crystal oscillator characterized by a container that is hermetically sealed by bonding the container from the front and back.