JPH0628755U - Surface mount type crystal unit measurement jig - Google Patents

Abstract

(57) [Summary] [Purpose] Stable, accurate, and reproducible measurement of the electrical characteristics of a surface-mounted crystal unit. [Structure] Two pedestals 12 are erected on the pedestal 11 and a frame 13 for positioning the crystal unit is provided. Contact pin 1 that contacts the electrode of the held crystal unit
5 and a measuring unit 16 for measuring the electric constant of the crystal unit via the contact pin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surface-mount type crystal unit measuring jig capable of stably and accurately measuring the electric constants of a surface-mount type crystal unit.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, piezoelectric vibrators, particularly inexpensive and high-performance crystal vibrators, have been widely used as references for frequency, time, etc. in various electronic devices. By the way, when such a crystal unit is manufactured, its electrical characteristics are measured. On the other hand, in recent years, there is a tendency for electronic devices to be smaller and lighter and automation of the assembly process is required, so that surface mount type electronic parts are often used. Is desired.

FIG. 2 is a perspective view showing an example of a surface-mount type crystal oscillator, in which a mounting electrode 2 is formed on the outer bottom surface of a ceramic base 1 formed in a bottomed box shape. The crystal piece 3 is arranged and held in the base 1. The crystal piece 3 has an excitation electrode formed on the plate surface so as to be electrically connected to the mounting electrode 2. Then, the lid 4 made of metal is placed over the opening on the upper surface of the base 1 and hermetically sealed by seam welding or the like. However, such a surface-mount type crystal unit has a small shape and does not have lead terminals either, so it is necessary to pay close attention to measure electrical characteristics in a stable and accurate manner. It was forced to decline.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above circumstances, and provides a surface mount type crystal unit measurement jig capable of stably and accurately measuring the electrical characteristics of the surface mount type crystal unit. The purpose is to do.

[0005]

[Means for Solving the Problems]

 In the present invention, two pedestals are erected on the pedestal and a frame portion for positioning the crystal unit is provided, and the pedestal is pierced through the pedestal. It is characterized in that a contact pin that comes into contact with the electrode of the vibrator and a measuring unit that measures the electric constant of the above-mentioned crystal vibrator through the contact pin are provided.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the perspective view shown in FIG. In the figure, 11 is a pedestal in which two columns 12 are erected in parallel at a predetermined interval. On the upper surface of this pedestal 11, for example, a frame portion 13 for positioning a surface-mounted crystal unit as shown in FIG. 2 is provided. The surface mount type crystal oscillator is turned upside down on the frame portion 13 and the mounting electrodes are arranged on the upper surface. A base 14 is mounted on the column 12 so as to be movable up and down. The base 14 is provided with four contact pins 15 which are insulated from each other and protrude below the base 14, and elastically mounted on the mounting electrodes of the surface mount type crystal unit held by the frame 13. It is designed to be in contact with each other for electrical conduction. Further, the base 14 is provided with a measuring unit 16 for measuring an electric constant obtained from the crystal unit via the contact pin 15. The contact pin 15 and the measuring unit 16 are connected to each other with a shortest distance by, for example, a single-core copper wire so that sufficient stability can be obtained electrically and mechanically. The measuring unit 16 is provided with a resistance circuit network for impedance matching when measuring the characteristics of the crystal unit by the π circuit method, for example. In this case, the measuring unit 16 is connected to an oscillator and a vector voltmeter (not shown) via a coaxial cable 17 having an appropriate length.

With this configuration, since the contact pin 15 and the measuring unit 16 are integrally provided on the base 14 so as to move up and down along the support column 12, the contact pin 15 and the measuring unit 16 are separated from each other. It is possible to connect mechanically and electrically stably in the shortest distance, which makes it possible to maintain a constant measurement condition when measuring the electrical constants of a crystal unit. High measurements can be made. When performing the measurement work, the mounting electrodes of the surface-mount type crystal unit are arranged on the frame 13 with the mounting electrodes facing upward, and the base 14 is lowered along the support columns 12 to bring the contact pins 15 into contact with the mounting electrodes. Contact. Then, the measuring unit 16 measures electric constants such as the resonance frequency and the crystal impedance of the crystal unit. Therefore, the contact between the contact pin 15 and the mounting electrode can be visually confirmed, and if the appropriate contact pressure can be obtained by the weight of the base 14, the workability is very good. The present invention is not limited to the above-described embodiment. For example, a vibration circuit is provided in the measuring unit 16 and a crystal oscillator placed in the frame unit 13 is brought into contact with the crystal unit to oscillate, and the oscillation output is taken out to the outside. The oscillation output frequency, output level, etc. may be measured. Also in this case, the crystal oscillator and the measuring unit 16 can be connected mechanically and electrically stably in the shortest distance as in the above-described embodiment, so that stable and accurate measurement can be performed.

[0008]

[Effect of device]

 As described in detail above, according to the present invention, it is possible to provide a surface mount type crystal unit measuring jig capable of stably and accurately measuring the electric constants of the crystal unit and having good workability. You can

[0009]

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a measuring jig of the present invention.

FIG. 2 is a perspective view showing an example of a crystal unit measured by the measuring jig of the present invention.

[Explanation of symbols]

 11 Pedestal 12 Support 13 Frame 14 Base 15 Contact Pin 16 Measuring Section

Claims (1)

[Scope of utility model registration request] 1. A pedestal in which two pillars are erected, a frame portion provided on the pedestal for positioning a crystal unit, a base held by the pillars and movable up and down, and a base. A contact pin that is provided so as to be insulated from each other and elastically protrudes downward to come into contact with an electrode of the crystal unit held by the frame portion; and an electrical pin of the crystal unit that is provided on the base and through the contact pin. A jig for measuring a surface-mount type crystal unit, comprising: a measuring unit that measures various constants.