JPH05145310A - Automatic setting device for resonance frequency of resonator - Google Patents

Abstract

PURPOSE:To attain the automatic setting of a resonance frequency with high accuracy by disposing a shaft having a frequency tuning dielectric body and the driving shaft of a driving means non-coaxially in parallel so as to utilize effectively a space around a dielectric resonator. CONSTITUTION:A shaft 15 and an output shaft 51a are set so as not to be coaxial, the output shaft 51a is arranged to a proper position within a radius of a shield case 13 of a dielectric resonator 10 to fix a stepping motor 51. Moreover, the center axis of the output shaft 51a and the center axis of the shaft 15 are made in parallel. Thus, the length from the side face 13b of a case 13 of the resonator 10 to the end face of the motor 51 is considerably reduced and the volume of the area occupied by a driving mechanism section 102 and the motor 51 is reduced. Furthermore, the area is moved in the diagonal direction of the resonator 10 from the extending line of the center of the resonator 10 in the axial direction and the free space is concentrated to a part, thereby utilizing the space effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically sets the resonance frequency of the resonator to the set frequency based on the frequency of the resonance frequency of the resonator to be set (hereinafter referred to as the set frequency). The present invention relates to a device for automatically setting the resonance frequency of a resonator to be set.

[0002]

2. Description of the Related Art The applicant of the present invention has disclosed, for example, a device for automatically setting a resonance frequency of a resonator for the purpose of automatically setting the resonance frequency of the resonator to a desired set value with good accuracy. Proposed in Japanese Patent Application No. 3-109033. The automatic setting device will be described below in the order of the following items. (1) Configuration of automatic setting device for resonant frequency of dielectric resonator (2) Principle of measuring resonant frequency of dielectric resonator (3) Control flow of automatic setting process of automatic setting device

The above automatic setting device includes an amplifier 33 for the dielectric resonator 10 which has a known load Q and whose resonance frequency is to be set.
Is electrically connected to the oscillation loop circuit including
oscillate at m, measure the oscillation frequency fm, and measure the oscillation frequency fm and the preset frequency f ₀₁ input in advance.
Based on the above, the resonance frequency f ₀ of the dielectric resonator 10 is automatically set to the above-mentioned set frequency f ₀₁ .

(1) Configuration of Automatic Resonant Frequency Setting Device for Dielectric Resonator FIG. 5 is a block diagram of an automatic setting device for resonant frequency of the dielectric resonator 10, which is an embodiment of the automatic setting device.
FIG. 6 is a vertical cross-sectional view of the dielectric resonator 10 of FIG. 5 and the shield case 13 that houses the dielectric resonator 10. Here, the dielectric resonator 10 has a known load Q (Q _L).

This automatic setting device has a filtering operation mode in which the dielectric resonator 10 operates as a band pass filter,
It has two operation modes, an automatic setting mode for performing an automatic setting process for automatically setting the resonance frequency f ₀ of the dielectric resonator 10 to the set frequency f ₀₁ .

As shown in FIGS. 5 and 6, the dielectric resonator 11 of the cylindrical dielectric resonator 10 for which the resonance frequency is to be set has a dielectric body at the center of the cylindrical shield case 13. The resonator 11 is mounted on a support 14 having the same linear expansion coefficient. This dielectric resonator 11 contains, for example, TiO ₂ as a main component and MgO, BaO, Z
A dielectric resonator 1 which is a ceramic dielectric resonator in which an oxide such as rO ₂ is mixed, and which includes the dielectric resonator 11.
0 is about 87 in TE _01δ mode which is the basic mode.
It has a resonant frequency f ₀ from ₀ MHz to about 895 MHz. In addition, a cylindrical dielectric tuning element 12 is provided inside the cylinder of the dielectric resonator 11 so as to be movable in the axial direction of the dielectric resonator 11 by a shaft 15. A microprocessor unit (hereinafter referred to as MPU) 40, which is a control circuit of the automatic setting device, outputs a predetermined number of drive pulse signals to a stepping motor 51 via a motor drive circuit 50 to output the stepping motor 51.
By rotating the shaft 15 and transmitting the driving force to the shaft 15 via the drive mechanism 52, the shaft 15 is moved in the direction of arrow A ₁
Move in the direction. By the movement of this shaft 15,
By moving the dielectric tuning element 12 in the electric field gradient of the dielectric resonator 11, the resonance frequency f ₀ of the dielectric resonator 10 can be finely adjusted.

FIG. 8 is a graph showing the relationship between the position of the dielectric tuning element 12 of the dielectric resonator 10 of FIG. 6 and the resonance frequency f ₀ of the dielectric resonator 10. Here, g is the distance from the upper surface of the dielectric tuning element 12 to the inside of the upper surface of the shield case 13. As is clear from FIG. 8, by separating the dielectric tuning element 12 from the upper surface of the shield case 13, that is, by increasing the distance g, the resonance frequency f ₀ of the dielectric resonator 11 becomes the distance g. It changes almost inversely. Therefore, assuming that the resonance frequency when the dielectric resonator 11 is at a certain position is f ₀ and the set frequency that should be set in the dielectric resonator 10 is f ₀₁ , the resonance frequency f ₀ of the dielectric resonator 10 is The distance lm to move the dielectric tuning element 12 in order to set the set frequency f ₀₁ is represented by the following “Equation 1”.

[0008]

[Number 1] _{lm = k (f 0 -f 01} )

Here, k is a constant determined from the graph of FIG. In this automatic setting device, as will be described later in detail, a pulse drive signal having the number of pulses corresponding to the moving distance lm calculated by using "Equation 1" is input from the MPU 40 to the stepping motor 51 via the motor drive circuit 50. Then, the dielectric tuning element 12 in the dielectric resonator 10 is moved, whereby the resonance frequency f ₀ of the dielectric resonator 10 is moved.
The resonance frequency of the dielectric resonator 10 can be automatically set so as to substantially match the set frequency f ₀₁ . When the moving distance lm calculated by the above “Equation 1” is a positive number, the pulse drive signal of positive polarity corresponding to the moving distance lm is a stepping motor 51.
, And at this time, the dielectric tuning element 12 is moved in the insertion direction into the dielectric resonator 11, whereby the capacitance component of the dielectric resonator 10 increases and the resonance frequency thereof decreases. On the other hand, when the moving distance lm calculated by the above “Equation 1” is a negative number, the pulse drive signal of negative polarity corresponding to the moving distance lm is a stepping motor 5
1, the dielectric tuning element 12 is moved in a direction in which the dielectric tuning element 12 deviates from the dielectric resonator 11, whereby the capacitance component of the dielectric resonator 10 is reduced and the resonance frequency thereof is increased.

FIG. 7 is a vertical sectional view of a drive mechanism 52 provided between the dielectric resonator 10 and the stepping motor 51.

As shown in FIG. 7, the drive mechanism 52 includes a shaft coupling 60 and two feed screws 61, which are concentric with the shaft 15 and the shaft 51a of the stepping motor 51 in the drive mechanism housing 52h. And 63. The shaft 15 of the dielectric resonator 10 has a lead screw 63.
Is inserted and fixed in. On the other hand, stepping motor 5
The shaft 51a of No. 1 has the feed screw 6 through the shaft coupling 60.
The shaft 61a is concentric with the first cylindrical portion 61c and protrudes from the end surface of the cylindrical portion 61c. The cylindrical portion 61c of the feed screw 61 is rotatably supported by the bearing 62 in the cylindrical portion 52hi which is inserted and fixed in the housing 52h of the drive mechanism 52 and is concentric with the shaft 15. The screw formed on the inner surface of the cylindrical portion 61c of the feed screw 61 and the screw formed on the outer peripheral surface of the feed screw 63 are screwed together. The upper surface of the drive mechanism housing 52h and the lower surface of the shield case 13 are bonded and integrated with each other. As a result, when the feed screw 61 is rotated, the feed screw 63 moves in the longitudinal direction of the shaft 15 accordingly, and at this time, the shaft 15 moves in the direction of arrow A1.

The shaft 15 of the dielectric resonator 10
In addition, the pressure is applied in the direction toward the stepping motor 51 by the pressurizing spring inserted in the cylindrical portion 13a of the shield case provided on the side opposite to the drive mechanism 52, and is inserted in the cylindrical portion 13a. The rotation of the shaft 15 is blocked by the rotation stopper 90 that is set.

In the drive mechanism 52 constructed as described above, when the stepping motor 51 is driven and the shaft 51a thereof rotates, the rotational driving force thereof is the shaft coupling 60.
Is transmitted to the shaft 15 of the dielectric resonator 10 via the feed screw 61 and the feed screw 63, and the shaft 15 moves in the direction of arrow A1.

Further, returning to the description of FIGS. 5 and 6, the shield case 13 is electromagnetically shielded on the outer surface of a cylindrical casing made of ceramic having the same linear expansion coefficient as the dielectric resonator 11. For this purpose, a silver electrode is burnt in. As shown in FIG. 5, this shield case 1
The inner surfaces of 3 and 9 around the center of the cylinder
As shown in FIG. 6, for example, one-turn coils 21 and 2 for signal input / output are coupled to four positions separated by an angle of 0 degree so as to be coupled to the magnetic field H of the dielectric resonator 11 as shown in FIG.
2, 23, 24 are provided. Here, the coils 21 and 22 used in the filtering operation mode are provided to face each other with the dielectric resonator 11 in between, and the coils 23 and 24 used in the automatic setting mode are arranged in the dielectric resonator 1.
1 are provided so as to be opposed to each other.

In the filtering operation mode, the switch SW1 is turned on and the switch SW2 is turned off, and the signal of about 800 MHz band output from the high frequency signal generator 1 is sent to the coil 21 via the input terminal T1 and the switch SW1. After being input to, the input signal is filtered by the dielectric resonator 10. The filtered signal is output from the coil 22 to the load 2 via the output terminal T2. On the other hand, in the automatic setting mode, the switch SW1 is turned off and the switch SW2 is turned on. At this time, the coils 23, 2
An oscillation signal is generated in the oscillation loop circuit which is connected between the four and is configured so that the oscillation condition described later in detail is satisfied. When the switch SW2 is turned on, the oscillation loop circuit shown in FIG. 5 is electrically connected between the coils 23 and 24, and the oscillation signal output from the coil 24 is directed to the amplifier 33 having the amplification degree A and the direction. The port 34a of the sex coupler 34,
It is output to the coil 23 via the transmission line connected between 34b and the switch SW2. The two switches SW1 and SW2 described above are provided in the MPU4 as described later in detail.
Switching control is performed by 0.

Ports 34a, 3 of the directional coupler 34
Port 34d for detecting an oscillating signal which is a traveling wave passing through the transmission line between 4b is connected to a frequency counter 35, and port 3 for detecting a reflected wave passing through the transmission line.
4c is terminated by a load 34e having a predetermined characteristic impedance. This frequency counter 35 is
The frequency of the oscillation signal detected in 4d is measured, and the measured frequency data fm is output to the MPU 40. A keyboard 42 for inputting the set frequency f ₀₁ is connected to the MPU 40, and when the set frequency f ₀₁ is input using the keyboard 42, the data is output from the keyboard 42 to the MPU 40.

The MPU 40 controls the automatic setting device to control the resonance frequency f ₀ of the dielectric resonator 10 to the set frequency f.
C that executes the automatic setting process for automatically setting ₀₁
A PU (not shown), a control program for controlling the automatic setting device, and a ROM (not shown) for storing data necessary for executing the control program.
RAM used as a working memory of the CPU
(Not shown), switches SW1 and SW2, frequency counter 35, CRT display 41, and keyboard 42.
And an input / output port circuit (not shown) connected to the motor drive circuit 50 and operating as an interface circuit. As will be described later in detail, the MPU 40 controls the switching of the switches SW1 and SW2, and the oscillation frequency data fm measured by the frequency counter 35.
Receive, the transmission phase theta ₁ of the dielectric resonator 10 is calculated based on the data fm of the received oscillation frequency, known load Q of the dielectric resonator 10 (Q _L) and the calculated transmission phase theta The resonance frequency f ₀ of the dielectric resonator 10 is calculated based on ₁ , and these data are displayed on the CRT display 41, and the resonance frequency f ₀ of the dielectric resonator 10 is calculated.
_A pulse drive signal is output to the stepping motor 51 so that ₀ becomes the set frequency f ₀₁ to perform the automatic setting process.

(2) Principle of Measurement of Resonance Frequency of Dielectric Resonator The oscillation conditions in the oscillation loop circuit shown in FIG. 5 are expressed by the following “Equation 2” and “Equation 3”.

[0019]

[Equation 2] Re (A · β ₁ ) = 1

[Equation 3] Im (A · β ₁ ) = 0

Where A is the amplification degree of the amplifier 33,
β ₁ is the feedback amount in the oscillation loop circuit.

In the above oscillation loop circuit, when the oscillation conditions represented by the above "expression 2" and "expression 3" are satisfied, an oscillation signal having a certain oscillation frequency fm is generated. The oscillation loop circuit shown in FIG. 5 has a predetermined transmission phase so that the above "expression 2" and "expression 3" are established.

In the above oscillation loop circuit, assuming that the transmission phase of the device and the line other than the dielectric resonator 10 and the line at an arbitrary frequency fa close to the resonance frequency f ₀ of the dielectric resonator 10 is Θ ₁ [rad], Transmission phase θ of body resonator 10
₁ is represented by the following "Equation 4".

[0023]

[Equation 4]

Here, n is an integer, and the transmission phase Θ
₁ is a device constant that can be measured in advance by a network analyzer in the above oscillation loop circuit.

As is clear from the equation (4), the dielectric resonator 10 in the oscillation loop circuit is measured by measuring the oscillation frequency fm in the oscillation loop circuit.
It is possible to obtain the transmission phase θ ₁ of.

[0026] The resonant frequency of the resonator and f _0, in general, the relationship of "number 5" in the following is established between the transmission phase θ of the resonator and its load Q (Q _L).

[0027]

[Equation 5]

Therefore, when the above oscillation loop circuit is applied to the above "Formula 5", the following "Formula 6" is obtained.

[0029]

[Equation 6]

From the above "Equation 6", the resonance frequency f ₀ is expressed by the following "Equation 7".

[0031]

[Equation 7]

Here, the dimensionless constant F ₁ is given by
It is represented by.

[0033]

[Equation 8]

Therefore, after measuring the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit, the measured frequency fm thus measured is substituted into the above "equation 4" and the transmission phase θ ₁ of the dielectric resonator 10 is changed. Can be calculated. Then, after calculating the values of the constants F ₁ known load Q of the calculated transmission phase theta ₁ and the dielectric resonator 10 (Q _L) are substituted into the "number 8" type, which is the calculated The value of the constant F ₁ can be substituted into the above “Formula 7” to calculate and measure the resonance frequency f ₀ of the dielectric resonator 10.

(3) Control Flow of Automatic Setting Process of Automatic Setting Device FIG. 9 is a flowchart showing a control flow of automatic setting process of the automatic setting device of FIG. 5 in the automatic setting mode. The measurement flow of the automatic setting device will be described.

First, in step S1, the set frequency f ₀₁ of the resonance frequency of the dielectric resonator 10 is the keyboard 42.
Input using the keyboard 42
The data is input to the PU 40, and at that time, the data is stored in the RAM. Then, in step S2, the switch SW
1 is turned off and the switch SW2 is turned on to set the automatic setting device in the automatic setting mode to connect the oscillation loop circuit between the coils 23 and 24. Further, in step S3, the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit is measured by the frequency counter 35, and the data fm is stored in the RAM in the MPU 40 as the oscillation frequency fm.

Next, in step S4, the measured oscillation frequency fm is substituted into the above "equation 4" to calculate the transmission phase θ ₁ of the dielectric resonator 10, and the calculated result is stored in the RAM. After substituting the calculated transmission phase θ ₁ into the above “Equation 8” to calculate the value of the constant F ₁ ,
Substituting the calculated value of the constant F ₁ into the above “Formula 7”, the resonance frequency f ₀ of the dielectric resonator 10 is calculated, and the calculated result is stored in the RAM and displayed on the CRT display 41. To do.

Then, in step S5, the dielectric tuning element is calculated by using the above " _equation 1" based on the current resonance frequency f ₀ calculated in step S4 and the set frequency f ₀₁ input in step S1. The moving distance lm of 12 is calculated, and the pulse drive signal corresponding to the calculated moving distance lm is output to the stepping motor 51 via the motor drive circuit 50 in step S6. As a result, the dielectric tuning element 12 is moved by the moving distance lm calculated above. Further, in step S7, the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit is measured by the frequency counter 35, and the data fm is stored in the RAM in the MPU 40.
Then, in step S8, as in step S4, the resonance frequency f ₀ of the dielectric resonator 10 is calculated based on the oscillation frequency fm measured in step S7, and the calculated result is obtained. Is stored in the RAM and displayed on the CRT display 41.

Further, in step S9, the absolute value of the difference between the current resonance frequency f ₀ calculated in step S8 and the set frequency f ₀₁ input in step S1 is calculated, and the value is predetermined. And a predetermined setting error Δf. Here, when the absolute value of the calculated difference is smaller than the setting error Δf (YES in step 9), it is assumed that the resonance frequency f ₀ of the dielectric resonator 10 substantially matches the setting frequency f _01. In step S10, the switch SW2 is turned off and the switch SW1 is turned on to end the automatic setting process, and the operation mode is set from the automatic setting mode to the filtering operation mode. On the other hand, when the absolute value of the calculated difference is equal to or larger than the setting error Δf (NO in step 9), the process returns to step S5, and the processes of steps S5 to S8 are repeated,
These processes are executed until the absolute value of the difference calculated in step S9 becomes less than the setting error Δf.

As described above, the dielectric resonator 10 to be measured having the known load Q is electrically connected to the oscillation loop circuit including the amplifier 33 and oscillates at the oscillation frequency fm, and the oscillation frequency fm is The resonance frequency f of the dielectric resonator 10 is measured based on the measured oscillation frequency fm.
Since ₀ the calculated measuring the resonance frequency f ₀ of the dielectric resonator 10, at higher compared with the conventional example precision, exactly the resonance frequency f ₀ of the dielectric resonator 10 having a known load Q Can be measured. Further, the distance lm to move the dielectric tuning element 12 based on the accurately measured resonance frequency f ₀ and the preset frequency f ₀₁ input in advance is calculated by using the above-mentioned “Equation 1”, and the calculated movement is calculated. The dielectric tuning element 1 is driven by driving the stepping motor 51 based on the distance lm.
2 is moved, and the above-described processing is repeated until the absolute value of the difference between the resonance frequency f ₀ measured by the above calculation and the previously input set frequency f ₀₁ reaches a predetermined setting error Δf. The setting process of the resonance frequency f ₀ of the dielectric resonator 10 can be executed with an improved accuracy of a relatively small error equal to or less than the error Δf.

[0041]

The above is the description of the automatic setting device of the resonance frequency of the resonator, which has been already proposed by the applicant of the present application. In the drive mechanism 52 constituting the automatic setting device, As is apparent from FIG. 7, since the output shaft 51a of the stepping motor 51 is arranged coaxially with the center line of the shaft 15 of the dielectric resonator 10, the length of the automatic setting device in the longitudinal direction becomes large. Further, since the drive mechanism 52 is provided centering on the extension line of the shaft 15, the drive mechanism 52 is provided as shown in FIG.
Since the space occupied by etc. is located at the lateral center of the dielectric resonator 10, there is a drawback that the space on the lateral side of the dielectric resonator 10 cannot be effectively used. Also, as shown in FIG.
Since the pressurizing spring 91 is provided inside the cylindrical portion 13a provided in the dielectric resonator 10, there is also a drawback that the overall shape of the cylindrical portion 13a becomes large. The present invention improves the above-mentioned points, makes it possible to effectively use the space around the dielectric resonator, and enables automatic setting of the resonant frequency with high accuracy. Automatic setting of the resonant frequency of the resonator The purpose is to provide a device.

[0042]

According to the present invention, the resonance frequency of a resonator is measured, and the measured resonance frequency is measured by moving a frequency tuning dielectric provided in the resonator by a moving means provided in the resonator. In a resonance frequency automatic setting device that matches a target frequency, a shaft moving means for moving a shaft provided with the frequency tuning dielectric and a drive shaft attached to the shaft moving means for driving the shaft moving means. And a driving means which is non-coaxial with and is arranged in parallel with.

The shaft moving means includes a feed screw inserted into the drive shaft, and a shaft moving screw having a fastening portion for fastening the shaft and a screw portion for engaging with the feed screw. In order to remove a backlash in an engaging portion between the feed screw and the shaft moving screw, a spring for urging the shaft moving screw in the axial direction of the drive shaft may be provided. ..

[0044]

The driving means is arranged such that the driving axis is non-coaxial and parallel to the shaft provided with the frequency tuning dielectric, and the shaft moving means is provided with the shaft by the driving force of the driving axis. Move in the axial direction. Therefore, the drive means and the shaft moving means enable the shaft to move in the axial direction without disposing the drive shaft in the axial direction of the shaft, so that the overall shape of the device does not become long in the axial direction of the shaft. To work. or,
The spring provided in the shaft moving means acts to eliminate backlash in the engaging portion between the feed screw and the shaft moving screw that constitute the shaft moving means, eliminates the occurrence of fine movement in the axial direction of the shaft, and causes resonance. It works to set the frequency automatically with higher accuracy.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing an embodiment of a dielectric resonator, a drive mechanism section and the like in an automatic resonance frequency setting device of the present invention, the same reference numerals are given to the same components among the components shown in FIG. The explanation is omitted. The shaft 15 to which the dielectric tuning element 12 is fixed is provided on the center line in the longitudinal direction of the cylindrical shield case 13 forming the dielectric resonator 10, and both ends of the shaft 15 form the shield case 13. The slide bearings 101a and 101b fitted into the central portions of the disk-shaped side walls 13a and 13b are inserted into the shaft 15, and the shaft 15 has the slide bearings 101a and 101b.
Is supported slidably in the axial direction of the shaft 15.
A side wall 102a of the housing of the drive mechanism unit 102 is closely fixed to the side wall 13b, and the shaft 15 is fixed to the side wall 10b.
Since it penetrates 2a and extends inward of the drive mechanism unit 102,
The plain bearings 101b are formed from the side wall 102a to the side wall 13
It is fitted in both the side wall 102a and the side wall 13b in the b direction. Also, the sliding bearings 101a and 101b
Is formed of, for example, a fluororesin, and
On the side wall 13a side, the amount of protrusion of the shaft 15 from the end surface of the plain bearing 101a is small.

The housing shape of the drive mechanism section 102 is a rectangular parallelepiped shape, and the side wall 10 facing the side wall 102a.
The output shaft 51a of the stepping motor 51 is projected to the inside of the drive mechanism portion 102 at 2b, and the shaft 15 and the output shaft 51a are not coaxial with each other. Shield case 13
The stepping motor 51 is fixed so that the output shaft 51a is arranged at an appropriate position within the radius of. The central axis of the output shaft 51a and the central axis of the shaft 15 are parallel to each other.
The one with 0 steps / one rotation is selected.

The output shaft 51a has a T-shaped cross section and has a through hole in the center thereof along the axial direction.
A feed screw 103 having a male screw 103a formed in the circumferential direction over an appropriate length along the axial direction is inserted into the outer peripheral surface of the cylindrical portion other than the protruding portion 103b. The feed screw 1
03 is fixed to the output shaft 51a of the stepping motor 51 by tightening a screw engaged with a female screw 103c formed in a through hole opened in the direction of the output shaft 51a at a part of the protrusion 103b. It rotates integrally with the output shaft 51a without slipping on the shaft 51a.

The male screw 103a of the feed screw 103 has a T
A shaft moving screw 104, which has a V-shaped cross-sectional shape and is formed in the axial central portion thereof with an internal thread 104a that engages with the external thread 103a along the axial direction,
Engage with b as the anti-stepping motor direction. or,
On the outer peripheral surface of the shaft moving screw 104, a male screw 104c is provided in an appropriate range on the end portion on the stepping motor 51 side.
Is formed. In addition, the other outer peripheral surface has a male screw 10
4c is a non-screw portion 104d on which no portion 4c is formed.

A slider 108 is fitted on the shaft moving screw 104. The slider 108 is a rectangular plate, and a through hole 108a that fits into a non-threaded portion 104d formed on the shaft moving screw 104 is formed in the center of the slider 108, and one end of the slider 108 is provided. As shown in FIG. 4, a through hole 108b provided with a notch 108c is formed so that the shaft 15 can be loosely fitted, and the other end of the slider 108 has a drive mechanism 10a.
A linear bush 1 having both ends fixed to the side walls 102a and 102b of the second housing, and guide pins 106 that are mounted parallel to the central axis of the shaft 15 and the central axis of the output shaft 51a of the stepping motor 51 are slidably inserted.
07 is penetrated and fixed in the plate thickness direction.

The shaft moving screw 104 and the slider 108 are fixed as follows. After the through hole 108a of the slider 108 is fitted into the non-threaded portion 104d of the shaft moving screw 104 and the slider 108 is advanced until the side surface of the slider 108 contacts the protruding portion 104b of the shaft moving screw 104, By fastening a nut 109 that engages with a male screw 104c formed on the screw 104, the slider 108 is fastened by the protrusion 104b and the nut 109, and the shaft moving screw 1
It is fixed at 04. When fixing the slider 108 to the shaft moving screw 104, the guide pin 106 is inserted through the linear bush 107, the shaft 15 is inserted through the through hole 108b, and the shaft 15 is fixed by tightening the screw 105. It is fastened to the slider 108.

Further, when fixing the slider 108 to the shaft moving screw 104, as shown in FIG. 1, the output shaft 51a of the stepping motor is centered between the side surface of the stepping motor 51 and the side surface of the slider 108. The spiral spring 110 may be attached. By mounting the spiral spring 110, the slider 108 fixed to the shaft moving screw 104 is biased in the arrow A direction, and the engaging portion between the female screw 104a of the shaft moving screw 104 and the male screw 103a of the feed screw 103. It is possible to eliminate unnecessary fine movements of the shaft moving screw 104 and eventually the shaft 15 due to the backlash, and it is possible to obtain a more accurate resonance frequency.

Shaft 1 extending into drive mechanism section 102
As shown in FIG. 1, a limit switch 111 composed of a light emitting device and a light receiving device is attached to the housing of the drive mechanism unit 102 near the end of No. 5. The optical axis of the limit switch 111 is on the front and back sides of the paper, and the slider 1
When the shielding plate 112 attached to the end of 08 blocks the optical axis, the limit switch 111 issues a signal to stop the operation of the stepping motor 51. The detection point on the limit switch 111 can be freely adjusted.

Further, the housing of the drive mechanism portion 102 is arranged with respect to the dielectric resonator 10 so that the outer peripheral surface of the housing is located on the extension line of the outer peripheral surface 10a at a position of the outer peripheral surface 10a of the dielectric resonator 10. And the housing is provided.

The operation of the resonance frequency automatic setting device in the thus constructed resonator will be described below. Now, it is assumed that the shaft 15 is in the initial state position where the limit switch 111 is operated and the stepping motor 51 is stopped by blocking the optical axis by the shield plate 112.
A signal supplied from the MPU 40 to the stepping motor 51 via the motor drive circuit 50 causes the stepping motor 51 to start operating and the output shaft 5 of the stepping motor 51.
1a rotates for a predetermined number of steps. The rotation of the output shaft 51a causes the feed screw 103 fixed to the output shaft 51a.
Both start rotating in the same direction.

Therefore, the shaft moving screw 104 engaging with the feed screw 103 also tries to rotate in the same direction as the feed screw 103, but the shaft moving screw 104 cannot rotate in the rotation direction of the output shaft 51a of the stepping motor. Since the certain shaft 15 and the slider 108 fitted to the guide pin 106 are fixed, the shaft moving screw 104 does not rotate in the rotation direction of the feed screw 103, while the shaft moving screw 104 does not feed. Screw 1
The shaft moving screw 104 and the slider 108 fixed to the shaft moving screw 104 are guided by the guide pin 106 while being guided by the guide pin 106 in the axial direction of the guide pin 106. ,
In other words, it moves along the axial direction of the output shaft 51a, in other words, along the axial direction of the shaft 15. Therefore, the shaft 15 fixed to the slider 108 is also attached to the slide bearing 10.
While being supported by 1a and 101b, the slider moves in the same direction as the slider 108, that is, in the axial direction of the shaft 15, for example, the arrow A direction shown in the figure. The stepping motor 51
When the output shaft 51a of FIG. 2 rotates in the opposite direction, the shaft moving screw 104, the slider 108, and the shaft 15 together move in the direction shown by arrow c, which is the opposite direction of arrow a. The change of the resonance frequency due to the movement of the shaft 15 is the same as the case of the resonator described in the above-mentioned application, and therefore the description thereof will be omitted.

The drive mechanism section 102 having the above-described structure has the following effects. Since the motor output shaft 51a is arranged non-coaxially with respect to the shaft 15, as shown in FIGS. 3 (a) and 3 (b), the stepping motor 51 can be driven from the side surface 13b of the shield case 13 of the dielectric resonator 10. The length L2 ′ to the terminal surface can be made significantly shorter than the same dimension L2 in the conventional case, and also shown in FIGS. 2 (a), 2 (b) and 3 (a), 3 (b). As described above, the volume v2 ′ of the area occupied by the drive mechanism unit 102 and the stepping motor 51 is set to the same volume v2 in the conventional case.
2 can be made smaller, and further, the above-mentioned region moves in the diametrical direction of the dielectric resonator 10 from the extension line of the central portion in the axial direction of the dielectric resonator 10, and as is clear from FIG. The empty space can be concentrated in a part, and the space can be effectively used. 2 and 3
In the driving mechanism section 102 and the stepping motor 5,
The volume portion occupied by 1 is collectively shown as a rectangular parallelepiped shape.

Further, in the resonator of the present embodiment, since the slide bearing 101a is only provided on the supporting portion of the shaft 15 on the side surface 13a of the shield case 13, as shown in FIGS. 3 (a) and 3 (b). As shown, the volume v1 'and the projection length L1' of the projecting portion from the side surface 13a can be greatly reduced compared to the same volume v1 and the same length L1 in the conventional case. Quantitatively, in the resonator of the conventional automatic setting device, the total value of the volumes v1 and v2 is about 200 cc.
However, in the automatic setting device of this embodiment, the total value of the volumes v1 'and v2' is about 100 cc, and the volume can be reduced to about 1/2. Also, the above-mentioned conventional length L1
And L2 in this embodiment compared to the total value of L1 'and L2.
The total value of 2'can be reduced to about 1/2.

Further, conventionally, since the output shaft 51a of the stepping motor 51 is connected with the shaft coupling 60 and the feed screw 61 as shown in FIG. 7, the moment of inertia acting on the output shaft 51a is large. In the case of this embodiment, the output shaft 51a is simply attached with the feed screw 103 having a diameter substantially equal to the shaft diameter of the output shaft 51a.
The moment of inertia acting on is greatly reduced compared to the conventional one. Therefore, the acceleration torque value required by the stepping motor 51 may be small, and the stepping motor can be downsized or the resonance frequency adjustment time can be shortened.

Furthermore, by using the spiral spring 110, it is possible to eliminate backlash in the engaging portion between the feed screw 103 and the shaft moving screw 104,
The resonance frequency can be set more accurately.

[0060]

As described above in detail, according to the present invention, the shaft provided with the frequency tuning dielectric and the drive shaft of the drive means are arranged non-coaxially and in parallel with each other. The outer shape of the device can be shortened in the axial direction, and the area occupied by the driving means and the shaft moving means deviates from the axial direction of the shaft, so that the empty space can be gathered in one direction. The space around the resonator can be effectively used. or,
According to the present invention, by providing the shaft moving means with the spring for removing the backlash in the engaging portion between the feed screw and the shaft moving screw, it is possible to prevent the axial fine movement of the shaft due to the backlash. It is possible to automatically set the resonance frequency with high accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the structure of a drive mechanism provided in a resonance frequency automatic setting device of the present invention.

FIG. 2A is a perspective view showing a region occupied by a drive mechanism section and a motor in a conventional resonance frequency automatic setting device. (B) It is a perspective view which shows the area | region which a drive mechanism part and a motor occupy in the automatic setting apparatus of the resonance frequency of this invention.

FIG. 3A is a diagram showing a region occupied by a drive mechanism section, a motor, and a cylindrical section in a conventional resonance frequency automatic setting device. (B) It is a figure which shows the area | region which a drive mechanism part, a motor, and a slide bearing occupy in the resonance frequency automatic setting apparatus of this invention.

FIG. 4 is a perspective view showing the slider shown in FIG.

FIG. 5 is a block diagram of a device for automatically setting a resonance frequency of a dielectric resonator.

6 is a vertical cross-sectional view of the dielectric resonator of FIG. 5 and a shield case that houses the dielectric resonator.

FIG. 7 is a vertical cross-sectional view showing details of the dielectric resonator shown in FIG. 5, a shield case accommodating the dielectric resonator, and a drive mechanism of the stepping motor.

8 is a graph showing the relationship between the position of the dielectric tuning element of the dielectric resonator of FIG. 5 and the resonance frequency.

9 is a flowchart showing an automatic setting process of the automatic setting device in FIG.

[Explanation of symbols]

Reference numeral 10 ... Dielectric resonator, 12 ... Dielectric tuning element, 15 ... Shaft, 51 ... Stepping motor, 102 ... Drive mechanism section, 103 ... Feed screw, 104 ... Shaft moving screw,
108 ... slider, 110 ... spiral spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toru Kurisu 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. Murata Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. The resonance frequency of a resonator is measured, and the frequency tuning dielectric provided in the resonator is moved by a moving means provided in the resonator to match the measured resonance frequency with a target frequency. In the automatic setting device, the shaft moving means for moving the shaft provided with the frequency tuning dielectric and the drive shaft attached to the shaft moving means for driving the shaft moving means are not coaxial with the shaft. An automatic setting device for a resonance frequency of a resonator, comprising: driving means arranged in parallel with each other. 2. The shaft moving means includes a feed screw inserted into the drive shaft, a shaft moving screw having a fastening portion for fastening the shaft, and a screw portion engaging with the feed screw. A device for automatically setting a resonance frequency of a resonator according to claim 1, further comprising: 3. A spring for urging the shaft moving screw in the axial direction of the drive shaft in order to remove a backlash at an engaging portion between the feed screw and the shaft moving screw. 2. A device for automatically setting a resonance frequency of a resonator according to 2.