KR20010066700A - Oscillator with cavity structure - Google Patents

Abstract

PURPOSE: A cavity oscillator is provided, in which oscillation frequency is varies in two stages, to thereby allow oscillation frequency to be varied in a free manner, while extending frequency range. CONSTITUTION: A cavity oscillator comprises a cavity(C1) formed by wrapping a predetermined space with a conductive material; a dielectric resonator-oscillator(DRO)(11) installed at the bottom surface of the cavity, and which generates and outputs oscillation frequency upon supply of an input voltage(Vin) from an external source; a frequency varying unit installed in the cavity with a predetermined spacing from the DRO, and which generates and outputs electrical signals for firstly varying the oscillation frequency of the DRO in accordance with a control voltage(Vc); and a tuning fork(F1) for secondly varying the firstly varied oscillation frequency. The frequency varying unit includes a support(21) arranged within the cavity so as to support the upper surface and the lower surface of the cavity, and a ceramic piezo-electric member(31) arranged in the direction opposite to the DRO and which supplies constant volume of frequency change to the DRO.

Description

Cavity oscillator {Oscillator with cavity structure}

The present invention relates to a cavity-type oscillator for resonant operation through an oscillation frequency, and in particular, the oscillation frequency is first changed through a frequency variable stage made of piezoelectric means of permanent magnet or ceramic material, and then using a tuning fork. The present invention relates to a cavity-type oscillator in which the frequency variable range can be expanded because secondary tuning of the frequency is performed.

In general, oscillators (oscillators, oscillators) are devices that generate electric continuous vibrations. They can grow according to the type of oscillation, oscillator, crystal oscillator, or sine wave, square wave, pulse oscillator, It is classified into low frequency oscillator, audible frequency oscillator, and high frequency oscillator.

Among the oscillators, the cavity-type oscillator having a cavity structure has a dielectric resonator oscillator (DRO; 1) and a constant in a cavity (C) that surrounds a predetermined space with a metal conductor wall as shown in FIG. 1. A tuning screw 2 is provided with a length H, and a metal surface 3 is formed below the tuning screw 2.

Accordingly, the tuning screw 2 instructs the variable amount to be resonant operation by adjusting the height H between the DRO 1 and the tuning screw 2 to adjust the frequency of the DRO 1.

In the operation of the cavity-type oscillator according to the prior art configured as described above, while the input voltage Vin is transferred into the cavity C, the tuning screw 2 is rotated to adjust the oscillation frequency of the DRO 1.

Then, the frequency adjustment function is performed as the height H between the DRO 1 and the tuning screw 2 increases and decreases as the metal surface 3 approaches the DRO 10 as the tuning screw 2 rotates. Will be.

However, in the related art, there is a problem that a limit occurs in the oscillation frequency variable range, and there is a concern that the thread may be worn out due to the rotational motion of the tuning screw 2 and the coupling force may be weakened and the tuning screw 2 may be detached. .

The present invention has been made to solve the above problems of the prior art, the object of the present invention is to change the frequency of oscillation primarily by appropriately using a piezoelectric ceramic or permanent magnet, and then to fine tune the frequency with a tuning fork. The present invention provides a cavity-type oscillator capable of varying the frequency and extending the frequency variable range.

1 is a view showing the configuration of a cavity-type oscillator according to the prior art,

2 is a view showing the configuration of a first embodiment of a cavity-type oscillator according to the present invention;

3 is a view showing the configuration of a second embodiment of a cavity-type oscillator according to the present invention;

4 is a view showing the configuration of a third embodiment of a cavity-type oscillator according to the present invention;

<Explanation of symbols on main parts of the drawings>

11, 12, 13: DRO 21: support

31, 32: piezoelectric means C1, C2, C3: cavity

M11, M12, M21, M22: permanent magnets F1, F2, F3: tuning fork

Vin: Input Voltage Vc: Control Voltage

According to a first aspect of the cavity-type oscillator according to the present invention for solving the above problems, a cavity (cavity) formed to surround a predetermined space with a conductive material, and generates an oscillation frequency when the input voltage is supplied from the outside of the cavity A resonant oscillation unit installed in the cavity to make it; A primary frequency variable part installed in the cavity at a predetermined interval from the resonance oscillator and generating and outputting an electrical signal to primarily vary the oscillation frequency according to a control voltage; And a secondary frequency variable portion for secondaryly varying the oscillation frequency that is firstly variable by the primary frequency variable portion.

In addition, according to the second aspect of the present invention, the primary frequency variable portion is fixed to the resonance oscillation portion at a predetermined interval and the support is formed of a conductive material to support the upper and lower surfaces of the cavity, and the And a piezoelectric means made of ceramic material which is installed to be movable in the opposite direction of the resonance oscillator and provides a constant frequency variable amount to the resonance oscillator by a control voltage.

According to a third aspect of the present invention, the primary frequency variable portion is provided at a predetermined interval with the resonance oscillator and the first permanent magnet for supporting the upper and lower surfaces of the cavity, and the resonance based on the first permanent magnet It is installed in the opposite direction of the oscillator is configured to include a second permanent magnet to provide a constant frequency variable amount to the resonator oscillator by adjusting the distance to the first permanent magnet.

On the other hand, according to a fourth aspect of the present invention, the primary frequency variable portion is fixed to the resonator oscillation portion at a predetermined interval and the support is formed of a conductive material to support the upper and lower surfaces of the cavity, and based on the support It is installed in the opposite direction of the resonator oscillator is configured to include a permanent magnet that provides a constant frequency variable amount to the resonator oscillator by adjusting the distance to the support.

According to a fifth aspect of the present invention, the primary frequency variable portion is provided at a predetermined interval from the resonance oscillation portion and the first permanent magnet for supporting the upper and lower surfaces of the cavity, and the resonance based on the first permanent magnet A piezoelectric means made of ceramic material which is fixedly installed in the opposite direction of the oscillation part to provide a constant frequency variable amount to the resonance oscillation part by a control voltage, and which attaches the piezoelectric means and the upper surface of the cavity to the upper part of the piezoelectric means. 2 permanent magnets are included.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4 show the configuration of the first, second and third embodiments of the cavity-type oscillator according to the present invention.

First, referring to FIG. 2, a first embodiment of the present invention includes: a cavity C1 formed to surround a predetermined space with a conductive material; A dielectric resonator oscillator (DRO) 11 installed at a lower surface of the cavity C1 to generate and output an oscillation frequency when an input voltage Vin is supplied from the outside of the cavity C1; A frequency variable stage installed at one side of the DRO 11 at a predetermined interval from the DRO 11 to generate and output an electrical signal to primarily vary the oscillation frequency according to a control voltage Vc; The tuning fork (F1) is configured to secondly vary the oscillation frequency, which is firstly variable by the frequency variable stage, within a desired range.

Here, the frequency variable stage is fixed to one side of the DRO (11) and the support (21) formed of a metal material (metal) to support the upper and lower surfaces of the cavity (C1), and the support 21 And a piezoelectric means 31 made of ceramic material which is installed to be movable in the opposite direction of the DRO 11 to provide a constant frequency variable amount to the DRO 11 by applying a control voltage Vc. do.

Next, referring to FIG. 3, a second embodiment of the present invention is constructed similarly to the first embodiment, but the frequency variable stage is installed at a predetermined interval from the DRO 12 to provide an upper surface of the cavity C2. And a distance between the first permanent magnet M11 supporting the lower surface and the first permanent magnet M11 based on the first permanent magnet M11 and installed in the opposite direction of the DRO 12. It is different from the above-described first embodiment in that it is composed of a second permanent magnet M12 which provides a constant frequency variable amount to the DRO 12 through the magnetic force.

In addition, referring to FIG. 4, the third embodiment of the present invention, unlike the first and second embodiments described above, has a top surface of the cavity C3 detachably formed, and the frequency variable stage includes a top surface of the cavity C3 and The first permanent magnet M21 supporting the lower surface and the first permanent magnet M21 are fixedly installed in the opposite direction of the DRO 13 to be fixed to the DRO 13 by a control voltage Vc. A second permanent magnet which is provided on the piezoelectric means 32 of ceramic material and the piezoelectric means 32 and the upper surface of the cavity C3, which is provided on the piezoelectric means 32 to provide a frequency variable amount. It consists of M22.

Meanwhile, another embodiment of the present invention is an example in which some components of the first to third embodiments are used, and a support formed of a conductive material to support the upper and lower surfaces of the cavity, and the DRO based on the support. There is also a permanent magnet that is installed in the opposite direction to provide a constant frequency variable amount to the DRO through the magnetic force due to the distance control with the support.

In this case, the permanent magnet may be fixed to the upper and lower surfaces of the cavity, or in some cases may be detachably installed.

As described above, in addition to the frequency variable method using the support 21, the piezoelectric means 31 and 32, and the permanent magnets M11, M12, M21, and M22, the present invention can perform the frequency variable in the first or second order in various ways. Can be.

In the operation of the present invention configured as described above, while the input voltage (Vin) is supplied to the DRO (11, 12, 13) to generate and output the oscillation frequency to be resonant operation, the oscillation frequency is primarily by the frequency variable stage After being provided with a constant variable amount, the tuning forks F1, F2 and F3 are fine tuned to the desired frequency range.

That is, as shown in FIG. 2, the support 21 is formed so that the upper and lower surfaces of the cavity C1 are supported to one side of the DROs 11, 12, and 13, and the DRO ( 11) Piezoelectric means 31 is provided in the opposite direction. Therefore, when the control voltage Vc is transmitted from the outside, the piezoelectric means 31 generates an electrical signal to vary the oscillation frequency of the DRO 11 according to the control voltage Vc. Thereafter, the tuning fork F1 adjusts the oscillation frequency using its natural frequency so as to be in a resonance operation state.

In addition, as shown in FIG. 3, first and second permanent magnets M11 and M12 are installed between upper and lower surfaces of the cavity C2 instead of the support 21 and the piezoelectric means 31. The first and second permanent magnets M11 and M12 primarily change the oscillation frequency of the DRO 12 by a magnetic force generated through mutual gap control. Then, the tuning fork F2 similarly performs frequency adjustment in a resonant operation state.

In another embodiment, as shown in FIG. 4, first and second permanent magnets M21 and M22 and piezoelectric means 32 are provided on upper and lower surfaces of the cavity C3. The upper surface is formed detachably. Therefore, the first and second permanent magnets M21 and M22 may generate magnetic force to some extent by interaction, but the permanent magnets M21 and M22 themselves and the piezoelectric means 32 are fixed to the cavity C3. It will perform the function.

Then, the piezoelectric means 32 primarily changes the oscillation frequency of the DRO 13 by the control voltage Vc, and then the tuning fork F3 performs the frequency adjustment secondarily.

On the other hand, the permanent magnets (M11, M12, M21, M22) can be easily mounted to the cavity (C2, C3) through the magnetic force with the cavity (C2, C3) formed of a metal material in some cases fixed, removable It can be installed selectively.

Thus, the present invention uses the support 21, the piezoelectric means 31, 32 of the ceramic material or the permanent magnets (M11, M12, M21, M22) to improve the variability of the oscillation frequency DRO (11, 12, 13) ), The variable range of the frequency is expanded because the oscillation frequency is again varied within the desired frequency range by the tuning forks F1, F2, and F3.

Cavity-type oscillator of the present invention configured as described above is to first change the oscillation frequency by appropriately using a metal support, piezoelectric ceramics or permanent magnets, and then secondary oscillation frequency through fine tuning of the frequency with a tuning fork. By varying the frequency, the frequency can be varied as desired, and the frequency variable range can be expanded.

Claims (8)

A cavity formed to surround a predetermined space with a conductive material, and a resonance oscillator installed inside the cavity to generate and output an oscillation frequency when an input voltage is supplied from the outside of the cavity; A primary frequency variable part installed in the cavity at a predetermined interval from the resonance oscillator and generating and outputting an electrical signal to primarily vary the oscillation frequency according to a control voltage; Cavity-type oscillator, characterized in that it comprises a secondary frequency variable for second-order variable oscillation frequency by the primary frequency variable. The method of claim 1, The primary frequency variable part is fixedly spaced from the resonator oscillator and is provided to support the upper and lower surfaces of the cavity and a support material formed of a conductive material, and installed to be movable in the opposite direction of the resonator oscillator based on the support. Cavity type oscillator, characterized in that it comprises a piezoelectric means of ceramic material to provide a constant frequency variable amount to the resonator oscillator by a control voltage. The method of claim 1, The first frequency variable part is provided at a predetermined distance from the resonance oscillator and is provided in a direction opposite to the resonance oscillator based on the first permanent magnet supporting the upper and lower surfaces of the cavity and the first permanent magnet. 1. A cavity type oscillator comprising a second permanent magnet configured to provide a constant frequency variable amount to the resonance oscillator by controlling a distance from the permanent magnet. The method of claim 1, The primary frequency variable part is fixedly spaced from the resonator oscillator and is fixed to the upper and lower surfaces of the cavity and is formed of a conductive material, and is installed in the opposite direction of the resonator oscillator based on the support and the support and Cavity-type oscillator comprising a permanent magnet configured to provide a constant frequency variable amount to the resonator oscillator by adjusting the distance of the. The method according to claim 3 or 4, Cavity oscillator, characterized in that the permanent magnet is fixed to the upper and lower surfaces of the cavity. The method according to claim 3 or 4, The permanent magnet is a cavity-type oscillator, characterized in that detachably installed on the upper and lower surfaces of the cavity. The method of claim 1, The primary frequency variable part is installed at a predetermined distance from the resonance oscillator and is fixedly installed in the opposite direction of the resonance oscillator based on the first permanent magnet supporting the upper and lower surfaces of the cavity and the first permanent magnet. A piezoelectric means of ceramic material for providing a constant frequency variable amount to the resonance oscillator by a voltage, and a second permanent magnet attaching the piezoelectric means and the upper surface of the cavity to each other above the piezoelectric means. Cavity type oscillator. The method of claim 1, Cavity oscillator, characterized in that the one side of the cavity is detachably formed to facilitate the mounting of the primary frequency variable.