JPS58222610A - Crystal oscillator - Google Patents

Abstract

PURPOSE:To attain a thermostatic chamber type crystal oscillator with a simple constitution and excellent temperature characteristic, by mounting a crystal oscillating element, a temperature sensor and a transistor (TR) for heating to a metallic block for almost completing thermal coupling. CONSTITUTION:A metallic block of the unified construction is formed by inserting the crystal oscillating element 3 to a hole 2 for use of a crystal oscillating element of a metallic block 1, inserting the temperature sensor 5 to a hole 4 for use of a temperature sensor, and mounting the TR7 for heating on one side face 6 of this metallic block 1. Further, the metallic block of the unified construction is mounted on a printed circuit board having the crystal oscillating circuit and a temperature control circuit, and the frequency versus temperature characteristic of the crystal oscillator is made constant by controlling the TR7 for heating so that the temperature of the crystal oscillating element 3 is kept constant with a detecting signal of the temperature sensor 5.

Description

[Detailed Description of the Invention] <&) Technical Field of the Invention (b) Prior Art and Problems The frequency-temperature properties of a crystal oscillator are mainly caused by the frequency-temperature characteristics of the crystal oscillator itself. Therefore, the frequency rIA[
In order to realize a crystal oscillator with excellent characteristics, it is necessary to reduce the temperature characteristics of the resonator itself, or to provide compensation means to stabilize the frequency even with a single change in temperature.

The temperature characteristics of the resonator itself are determined by the cut-out angle of the crystal piece, so it is theoretically possible to reduce the temperature characteristics of the resonator itself by strictly suppressing this, but this poses a difficult manufacturing problem. Therefore, the following method is generally used.

First method: The vibrator is housed in a constant temperature bath so that the temperature of the vibrator is always constant with respect to the external temperature.

Second method: A temperature-voltage converter is provided to compensate for the frequency-temperature characteristics of the crystal resonator, and the frequency of the voltage-controlled oscillator is controlled by this converted voltage. This is a so-called temperature compensated crystal oscillator.

The first method is often used as a highly stable oscillator because it can produce an oscillator with excellent mF characteristics by strictly controlling the performance of the thermostatic chamber, but it has the disadvantage of a complicated structure. The second method has the disadvantage that it is not only necessary to correct the control voltage of the voltage controlled oscillator for each crystal oscillator, but also that it is difficult to obtain a control voltage that can be completely compensated for temperature.

Therefore, there is a need for a crystal oscillator that can obtain highly accurate frequency-temperature characteristics using a simple method.

(c) Purpose of the Invention In order to solve the drawbacks of the upper piece, the present invention provides a new crystal oscillator that stabilizes the temperature of the crystal oscillator by mounting a crystal oscillator, a temperature sensor, and a heating transistor on a metal block. The purpose is to provide

(d) Structure of the Invention According to the present invention, in a so-called constant-temperature paddle type crystal oscillator that stabilizes the temperature of a crystal oscillator, the crystal oscillator and a temperature sensor are fitted into a metal block, Furthermore, by installing a heating transistor to form an integrated structure, the crystal resonator, the temperature sensor, and the heating transistor are thermally conductively coupled to each other via the metal block. A metal block is mounted on a printed circuit board having a crystal oscillation circuit and a temperature control circuit, and a heating transistor is controlled by a detection signal from a limb temperature sensor to control the temperature of the crystal resonator connected to the crystal oscillation circuit. This is achieved by keeping it constant.

(et) Examples of the Invention The present invention will be described below with reference to the drawings. FIG. 1 shows a metal block used in the present invention.

In the same figure, a hole 2 for a crystal resonator in a metal block 1 is shown.
A crystal oscillator 3tl is fitted to the core metal block l, a temperature sensor 5 is fitted to the hole 4 for the temperature sensor, and one side 6 of the nuclear metal block l is fitted.
Attach one heating transistor 8 and see Figure 2 (a) #.
The metal block 9 of the integrated structure shown in Fig. 2 (b
) is mounted on the printed circuit board 1o shown in FIG. In this way, by integrating the crystal oscillator 3, temperature sensor 5, and heating transistor 7 with a metal block, they are thermally conductively coupled, and the heat generated from the heating transistor 7 is transferred to the crystal oscillator 3.
conduct to. The temperature of the crystal resonator 3 is detected by a temperature sensor 5. In FIG. 2(a), 11 is a terminal of the crystal resonator 3, 12 is a terminal of the temperature sensor 5, and 13 is a terminal of the heating transistor 7.

FIG. 2) is an embodiment of the present invention, and shows a crystal oscillator composed of a metal block 9 equipped with a crystal resonator, a sensor, and a heating transistor, a crystal oscillation circuit 14, and a humidity control circuit 15. In the figure, the metal block 9 does not include a crystal oscillator 3, a temperature sensor 5, and a heating transistor 7.
The terminals of are connected by a pre-designed printed circuit board pattern, and the heating transistor 7 is controlled by the output signal of the temperature sensor so that the temperature of the crystal oscillator becomes constant, thus keeping the frequency-temperature characteristics of the crystal oscillator constant. Make it.

As a result of the above, the temperature pressure once with respect to the temperature fluctuation of the metal block 9 becomes less than a few tenths, and the frequency temperature characteristic becomes 10-
'The following crystal oscillators can be implemented.

(f) Effects of the Invention According to the present invention, by integrating a crystal resonator, a temperature sensor, and a heating transistor into a metal block, thermal coupling, which tends to be incomplete during the manufacturing process, can be almost completely eliminated. Therefore, a constant temperature paddle crystal oscillator with excellent temperature characteristics can be realized with a very simple configuration.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the mounting process of a metal block of the present invention, a crystal resonator, a temperature sensor, and a heating transistor to be fitted and attached thereto, and Fig. 2 (a) is an integrated gold II4 #Block, Figure 2 (bJ shows a crystal oscillator in which the metal block is mounted on a printed circuit board. In the figure, l is a metal block, 2 is a hole in which a crystal resonator is accommodated, and 3 is a crystal resonator. , 4 is a hole in which a temperature sensor is housed, 5 is a temperature sensor, 6 is a side surface of the metal block, 7 is a heating transistor, 8 is a screw hole for mounting a heating transistor, 9 is a crystal oscillator 3 and a temperature sensor 4 and a metal block equipped with a heating transistor 7, 1o is a printed circuit board, 11° 12.13 is a terminal, ll', 12', 13'
are printed circuit board insertion holes that fit into terminals 11, 12, and 13, respectively, 14 is a crystal oscillation circuit, 15 is a temperature control circuit,
shows.

Claims (1)

[Claims] In a thermostatic paddle-type crystal oscillator in which a crystal oscillator is housed in a thermostatic chamber, the crystal oscillator, temperature sensor, and heating transistor are mounted on a metal ivy so that all terminals of the components are aligned in approximately the same direction. The metal block of the integrated structure is generally used in a printed circuit board having a crystal oscillation circuit and a temperature control circuit, and having insertion holes that fit into the terminal arrangement of the mosquito metal block. A crystal oscillation circuit that is characterized by being mounted in the same way as standard printed circuit board components.