JPH01105602A - Automatic tuning resonating device - Google Patents

Abstract

PURPOSE:To adjust a frequency in a short time without using a hand by giving an input wave to a resonator, taking out a power having passed through the resonator from a passing power coupling terminal, giving it to a control circuit, and driving the resonant frequency adjusting element of the resonator by driving a driving mechanism by its output. CONSTITUTION:When the electromagnetic wave of the frequency f0 is inputted to the input terminal 5 of the resonator 9, in a case that the resonator 9 is tuned to the input frequency f0, almost all of the inputted electromagnetic wave passes through said resonator 9, and is inputted to a passing power take out unit 12. Besides, in the case that the resonator 9 is detuned, the electromagnetic wave, attenuated according to its detuning quantity, is inputted to the passing power take out unit 12. In the passing power take out unit 12, a part of the electromagnetic wave is coupled to a loop coupling part 14, and is detected by a detecting part 16, and a voltage corresponding to passing power is generated. A control circuit 18 decides the level of this voltage, and sends a control signal to a drive circuit 19. When the resonator 9 comes to be tuned to the frequency f0, the voltage, generated at a passing power coupling terminal 15 comes maximum. At that time, the control circuit 18 stops the control signal being given to the driving mechanism 19, and holds the resonator 9 at a tuning state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an automatic tuning method that automatically adjusts by automatically varying the insertion length of a resonant frequency adjusting element inserted into a resonator when the resonant frequency deviates. This invention relates to a resonance device.

[Prior Art] Conventional resonators of this type have structures shown in FIGS. 7 to 9.

FIG. 7 shows an example of a semi-coaxial resonator, in which a resonant frequency adjustment element 2 made of screws is inserted into the semi-coaxial resonator body 1 at a position where the electric field is strong and is screwed into the resonator body 1. , the resonant frequency adjustment element 2 was fixed with a fixing nut 3. Note that 4 is a temperature/frequency compensator made of bimetal, 5 is an input coupling element, and 6 is an output coupling element.

To make such a semi-coaxial resonator resonate at a specified frequency, attach a wattmeter to the output coupling element 6, input power at the specified frequency from the input coupling element 5, and find the point at which the passing power is maximum. Find it by changing the insertion length of the resonance frequency adjustment element 2 and fix it with the fixing nut 3.

FIG. 8 shows an example of a cavity resonator, and parts corresponding to those in FIG. 7 are shown with the same reference numerals.

FIG. 9 shows an example of a dielectric resonator, and similarly, parts corresponding to those in FIG. 7 are given the same reference numerals.

Note that 7 is a dielectric, and 8 is a support that supports the dielectric 7.

[Problems to be Solved by the Invention] However, in conventional resonators, when setting the resonant frequency, a measurement system must be connected and the setting must be done manually, which takes time and effort. Ta. Further, in the conventional structure, there was a problem in that the resonant frequency slightly deviated from the designated frequency depending on the temperature due to an installation error of the temperature/frequency compensator 4, etc.

An object of the present invention is to provide an automatically tuned resonant device that can automatically perform frequency adjustment.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained with reference to FIGS. 1 to 6, which are opposite to the embodiments. 2, and a drive mechanism 18 for driving the resonant frequency adjustment element 2 of the resonator 12; Passing power coupling terminal 15 provided at the output end and taking out passing power
Then, a control output is given to the drive mechanism 18 using the output from the passing power coupling terminal 15 as an input, and a point in time when the output from the passing power coupling terminal 15 becomes maximum is detected, and the drive mechanism 18 is driven at that time. It consists of a control circuit 17 that performs control to stop the operation.

[Function] Such an automatic tuning resonance device applies an input wave to the resonator 12, extracts the power that has passed through the resonator 12 from the passed power coupling terminal 15, and applies it to the control circuit 17.
The output of the resonator 1 automatically drives the resonant frequency adjusting element 2 of the resonator 12 by driving the driver VJIll structure 18.
2 synchronization can be performed.

[Example] Hereinafter, a first example of an automatic tuning resonance device according to the present invention will be described.
This will be explained with reference to FIGS. 5 to 5. In the figure, 9 is a resonator whose resonance frequency is adjusted, and the resonator main body 1
A capacitive or inductive resonant frequency adjustment element 2 is inserted into the resonator body 1 through a through hole 10, and the resonant frequency is adjusted by adjusting its insertion length.

Reference numeral 11 denotes a contact that protrudes into the resonator body 1 along the through hole 10 and grips the tip of the resonant frequency adjustment element 2 to establish electrical conduction with the resonator body 1. Reference numeral 12 denotes a passing power extraction device in which an input terminal 13 is connected to the output coupling element 6 of the resonator 9, 14 a loop coupling portion provided within the passing power extraction box 12, and 15 a diode in the loop coupling portion 14. A passing power coupling terminal 17 connected via the detection unit 16 is a passing output terminal of the passing power extractor 10. Reference numeral 18 denotes a control circuit which takes the output signal from the passing power coupling terminal 15 as an input signal and outputs a @ control signal for frequency adjustment, and is composed of an analog/digital conversion section 18A and a voltage level determination section 18B. 19 is control circuit 1
A drive mechanism receives a control signal from 8 via an input terminal 20 to drive the above-mentioned resonance frequency adjustment element 2, and 21 is an alarm terminal that transmits the movement operation of the drive mechanism 19 to the control circuit 18. Next, a specific example of the drive mechanism 18 will be explained with reference to FIG. In the figure, 22 is 111g circuit 1
a stepping motor 23 to which a control signal is input from 8;
is a pulley fixed to the output shaft 22A of the stepping motor 22, 24 is a threaded portion provided on the outer periphery of the base end of the shaft portion 2A of the resonance frequency adjustment element 2, and 25 is a threaded connection by screwing back the threaded portion 24. 26 is pulley 2
The timing belt is passed at 3°25111,
27 is a thrust bearing that holds the pulley 25 from both sides via a guide member 28; 29 is a pressure spring that pressurizes the thrust bearing 27 to prevent the pulley 25 from wobbling; 30 is a spring of the pressure spring 29; It is receiving. The spring receiver 30 is screwed into a screw hole 32 provided in a frame 31 of the drive mechanism 19. Reference numeral 33 designates a backlash prevention spring that presses the resonance frequency adjustment element 2 via the presser bar 34 to prevent a breakage crash due to the meshing portion of the screw, and 35 designates a spring holder for the backlash prevention spring 33. The spring receiver 35 is screwed into a screw hole 36 provided in the spring receiver 30 described above. 37 is a limit switch that detects the limit of movement of the threaded portion of the resonant frequency adjustment element 2 with the pulley 25; 38A and 38B are attached to the shaft portion 2A of the resonant frequency adjustment element 2; 37 is a limit switch operator, and 39 is the shaft portion 2A of the resonance frequency adjustment element 2.
40.41 is a resonant frequency adjustment element 2.
A key consisting of a key groove provided in the shaft portion 2A to prevent rotation of the key, and a ball fitted into the key groove,
A key holder 42 is screwed into a screw hole 43 of the frame 31 and holds down the key 41.

Next, the operation of such an automatic tuning resonance device will be explained. When a radio wave with a frequency f0 is input to the input terminal 5 of the resonator 9, most of the radio waves pass through the resonator 9 and the passing power is reduced if the resonator 9 is tuned to the input frequency fO. It is input to the extraction tool 12. Further, when the resonator 9 is detuned, a radio wave attenuated according to the amount of detuning is input to the passing power extraction device 12. In the passing power extractor 12, a part of the radio waves is coupled to the loop coupling part 14, and detected by the detection part 16, and a voltage corresponding to the passing power is generated. This voltage is applied to the control circuit 18, converted into a digital signal by an A/D converter 18A in the control circuit 18, and provided to a voltage level determination section 18B, where the voltage level is determined.

When the resonator 19 is tuned to the frequency fO, the voltage generated at the passing power coupling terminal 15 becomes maximum as shown in FIG. At this time, the voltage level determination section 18B
A stop signal is issued to stop the signal being applied to the drive mechanism 19. This keeps the resonator 9 in tune.

If the resonator 9 goes out of tune for some reason, the stop signal given from the voltage level determination section 18B to the A/D conversion section 18A disappears, so the signal is no longer given to the drive mechanism 19 from the A/D conversion section 18A. The same aWA adjustment is restarted.

FIG. 6 shows another example of the passing power extraction tool 12. In this embodiment, a loop coupling section 14 is provided within the resonator body 1 to extract the passing power.

[Effects of the Invention] As explained above, according to the present invention, it is possible to automatically tune to the input frequency, so there is an advantage that frequency adjustment can be performed in a short time without using human hands.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the automatic tuning resonance device according to the present invention, FIG. 2 is a circuit diagram showing the configuration of the passing power extractor in FIG. 1, and FIG. 3 is a diagram showing the internal configuration of the control circuit. A block diagram showing an example, FIG. 4 is a longitudinal sectional view showing an example of the drive mechanism, FIG. 5 is a waveform diagram showing an example of passing power, and FIG.
The figure is a circuit diagram showing an example of a passing power extractor, and FIGS. 7 to 9 are longitudinal cross-sectional views showing three examples of conventional resonators. 2... Resonant frequency adjustment element, 9... Resonator, 12...
... Passing power extraction tool, 15... Passing power coupling terminal,
18... Control circuit, 19... Drive mechanism. -Flute 3 Figure 4

Claims (1)

[Claims] A resonator having a structure that includes a resonant frequency adjustment element and is tuned by operating the resonant frequency adjustment element, a drive mechanism that drives the resonant frequency adjustment element of the resonator, and the resonator or its output terminal. a passing power coupling terminal provided at the pass-through power coupling terminal for taking out the passing power; and a control output provided to the drive mechanism by using the output from the passing power coupling terminal as input, and detecting a point in time when the output from the passing power coupling terminal reaches a maximum. and a control circuit for controlling the drive of the drive mechanism to be stopped at that time.