JPH11127054A - Crystal vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a shield for radio wave noise prevention and to make an electric circuit small-sized by bringing a lead frame which is not connected to a crystal main body into contact with a can covering the crystal and molding it with resin in one body. SOLUTION: The crystal vibrator is structured by bringing the lead frame 3 which is not connected to the crystal main body between lead frames 2 and 3 for soldering to a printed board is brought into contact with the can covering the crystal and molding it with resin in one body. Namely, the can 1 which covers the crystal and the lead frame 3 for soldering are brought into contact and molded integrally with the resin 4 in one body. Thus, the lead frame 3 contacting the can 1 is soldered to a ground-side circuit to give the can 1 the same effect with a shield for radio wave noise prevention which is conventionally used. Consequently, the influence of radio wave noise is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crystal resonator for oscillating a voltage at a predetermined frequency for controlling an electronic circuit.

[0002]

2. Description of the Related Art In recent years, with the development of electronic equipment, various kinds of radio waves have been flying and the phenomenon of causing malfunction of electronic equipment has been increasing. Therefore, as shown in FIG. 3, a shield technology for covering a crystal unit 8 most susceptible to radio wave noise in an electronic circuit with a shield 7 such as a sheet metal connected to a ground side circuit so as to be less susceptible to radio wave noise. Is becoming popular.

[0003]

However, with the miniaturization and weighing of electronic equipment, there is a problem that a space for installing a shield 7 for preventing noise is not provided.

[0004]

In order to solve the above-mentioned problems, in the present invention, a can covering a quartz oscillator is used for preventing radio wave noise, and a conventional shield is omitted. .

[0005]

1 is a cross-sectional view of a lead frame for soldering to a printed circuit board according to a first embodiment of the present invention; The lead frame is connected to the grounding side circuit, so that the can has the same effect as the shield for preventing radio noise. It is hard to receive.

According to the second aspect of the present invention, a lead frame for soldering in a state of being in contact with a can covering a crystal is connected to a ground side circuit so that the can can prevent radio wave noise. It has the same effect as the shield, and is less susceptible to radio noise.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a structural view showing a crystal resonator according to Embodiment 1 of the present invention. The difference from the conventional surface mount type crystal resonator is that the can 1 covering the crystal and the lead frame 3 for soldering are brought into contact with each other and are integrally molded with the resin 4.

Thus, by soldering the lead frame 3 which is in contact with the can 1 to the ground side circuit, the same effect as the conventional shield for preventing radio noise can be provided to the can 1. it can.

(Embodiment 2) FIG. 2 is a structural view showing a crystal resonator according to Embodiment 2 of the present invention. The difference from the conventional printed board insertion type crystal resonator is that a lead frame 5 having a structure in contact with the can 1 covering the crystal is provided.

Thus, by soldering the lead frame 5 which is in contact with the can 1 to the ground side circuit, the same effect as the conventional shield for preventing radio wave noise can be provided to the can 1. it can.

[0012]

As described above, according to the quartz oscillator of the first aspect of the present invention, a shield for preventing radio noise, which has been conventionally used, is not required, and the electronic circuit can be further miniaturized.

Further, the same effect as in the above-described case can be obtained also in the quartz resonator according to the present invention.

[Brief description of the drawings]

FIG. 1 is a three-view drawing showing a configuration of a crystal resonator according to a first embodiment of the present invention.

FIG. 2 is a three-view drawing illustrating a configuration of a crystal resonator according to a second embodiment of the present invention.

FIGS. 3A and 3B are a plan view and an elevation view showing a configuration of a radio wave noise prevention technology using a conventional crystal resonator.

[Explanation of symbols]

 1 Can 2, 3, 5 Lead frame 4 Resin

Claims (2)

[Claims] An electronic circuit having a structure in which a lead frame that is not connected to a crystal main body among lead frames to be soldered to a printed circuit board is integrally formed of resin by contacting with a can covering the crystal. Surface mount type crystal unit for control. 2. A printed board insertion type crystal unit for controlling an electronic circuit, comprising a lead frame for soldering in contact with a can covering a crystal.