JPH065204U - Variable tuning resonator with automatic tuning - Google Patents

Abstract

(57) [Abstract] [Purpose] Rotating a motor by inserting a central conductor movably in the axial direction from the other open end side of a hollow cylindrical outer conductor with one end short-circuited, which is used in wireless communication devices. The structure of the tunable resonator, which automatically changes the tuning frequency by adjusting the length of the center conductor by using the one converted from the motion to the linear motion as the driving source, is miniaturized. [Structure] The central conductor (1) is formed in a hollow cylindrical shape and is slidable in the axial direction onto the inner diameter portion of a cylindrical guide portion (cc ') provided in the central portion of the open end surface of the outer conductor (2). And a female screw carved on the inner peripheral surface of a circular hole formed at the center of the open end surface of the central conductor (1) is carved on the outer peripheral surface of the shaft (4) that rotates integrally with the motor (5). A disk (8) that rotates together with a motor (5) to detect the maximum and minimum lengths of the central conductor (1) by engaging a screw to convert the rotational motion into a linear motion.
Holes (9, 10) and optical device (1
The structure is performed by combining with 1).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a self-tuning tunable resonator used in a wireless communication device or the like, and particularly to improving the structure of the center conductor to realize miniaturization and detecting means at the maximum and minimum lengths. It is intended to improve.

[0002]

[Prior art]

 A self-tuning tunable resonator has a hollow cylindrical outer conductor with one end short-circuited, and a cylindrical center conductor inserted from the other open end side to convert the rotational motion of the motor into a linear motion. As a drive source, the tuning frequency is automatically changed by changing the insertion length of the center conductor. Fig. 2 shows an example of a conventional structure. In the drawing, the cylindrical central conductor 1 is inserted through the center portion of the right open end face of the hollow cylindrical outer conductor 2 whose left end face is short-circuited. The shaft 4 has threads on its outer peripheral surface over its entire length, and the bearing 3 has an internal thread for engaging with the male thread. When the motor 5 is rotated, the shaft 4 is rotated, and the central conductor 1 is moved together with the bearing 3 in the aa 'direction inside the cavity and in the b-b' direction outside the cavity. The resonance frequency changes as the distance between the left end of the center conductor and the left end face of the central conductor 1 changes. Reference numeral 6 is an encoder, 7 is a potentiometer, which are connected to the motor 5 by gears 15, 16 and 17, which detect the moving position of the central conductor 1 from the rotation speed of the motor 5 and have a specific frequency. The electric signal is used to detect whether the resonance point of is in the correct position. Reference numerals 12 and 13 are microswitches mounted at predetermined positions outside the cavity, and 14 is a contact plate fixed to the outermost portion of the rightmost end of the center conductor 1. These 12, 13, and 14 are the center conductor 1 If the amount of movement exceeds the preset amount, or if the encoder 6 or potentiometer 7 detects an error in the moving position due to, for example, the disengagement of the gears, the microswitch 12 or 13 has contacted the cover plate 14. It is determined that the movement amount of the central conductor 1 has exceeded the set value, and the motor 5 is forcibly stopped or a control signal for rotating the motor 5 in the opposite direction is generated to protect the equipment. is there. The two micro switches 12 and 13 are provided to detect the left and right movement limit positions of the central conductor 1, that is, to detect the maximum and minimum lengths of the central conductor 1. Is.

[0003]

[Problems to be solved by the device]

 As described above, in the prior art, the maximum and minimum lengths of the central conductor 1 were detected by the microswitches 12 and 13 provided outside the cavity, so there was a limit to downsizing the equipment. . Furthermore, since the position detection mechanism using a microswitch is a method that uses mechanical contact between the touch plate and the antenna, maintenance is troublesome and the position detection accuracy is limited.

In order to reduce the size of the device, the central conductor 1 may have a structure with no movement amount between bb and b'in FIG. 2, but in that case, the installation location of the microswitch is It becomes impossible to detect the maximum and minimum lengths of the central conductor 1, and there is no means for protecting the equipment when an error occurs in the encoder 6 and the potentiometer 7.

The object of the present invention is to eliminate the need for using a microswitch, thereby enabling downsizing of the device, and moreover, enabling detection of the maximum and minimum lengths of the central conductor 1 and ensuring protection of the device. It is an object of the present invention to provide a self-tuning tunable resonator having a structure capable of performing the above-mentioned structure.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, the central conductor is axially movably inserted from the other open end side of the hollow cylindrical outer conductor having one end short-circuited, and the rotary motion of the motor is linearly moved. In the tunable resonator with automatic tuning that automatically changes the tuning frequency by changing the insertion length of the center conductor by converting , (B) A circular hole that is slidable in the axial direction inside the inner diameter of the cylindrical guide provided at the center of the open end of the outer conductor, and (b) at the center of the other open end of the center conductor. By engaging the female screw carved on the inner surface with the male screw carved on the outer peripheral surface of the shaft that rotates integrally with the motor, the rotary motion is converted into linear motion. (C) When the length of the center conductor is the maximum or minimum Is detected at a disc that rotates at a low speed according to the rotation of the motor. A variable tuned resonator for automatic tuning of the structure for the optical device to be output as an electric signal the passage of holes drilled in the position by the optical detection.

[0007]

[Action]

 With the structures (a) and (b) of the present invention, the amount of movement between a and a'is secured without moving the central conductor between b and b'in the conventional structure of FIG. This makes it possible to reduce the size of the device. Furthermore, by adopting the structure of (c), it becomes possible to detect the maximum and minimum lengths of the center conductor with an optical device, and the maintenance work of the switch parts, such as when using a microswitch of the conventional structure, is required. It is also possible to detect the position with high accuracy.

[0008]

【Example】

 FIG. 1 shows a sectional view of an embodiment of the present invention. 1 (a) is an overall configuration diagram, (b) is a plan view of a disc for detecting the maximum and minimum lengths of the central conductor, and (c) is an enlarged positional relationship between the disc and the optical device. FIG. In the figure, a hollow cylindrical outer conductor 2 having a short-circuited end on the left side holds a bearing 3 at the open end on the right side, and a shaft 4 supported by this bearing 3 extends long to the left side. In No. 4, screws are carved on the outer peripheral surface over almost the entire length. The center conductor 1 is formed in a hollow cylindrical shape with a short circuit on the left end face, and a female hole for engaging the above male screw is carved on the inner peripheral surface of a circular hole formed in the center of the open end face on the right side. The rotation of the center conductor 1 causes the center conductor 1 to slide in the axial direction while being guided by the inner peripheral surface of a cylindrical guide portion c-c ′ provided at the center of the open end surface of the outer conductor 2. As a result, the rotational movement of the motor 5 is converted into the linear movement of the central conductor 1 to change the resonance frequency. In the conventional structure, the central conductor has a cylindrical shape, and the maximum and minimum lengths are detected by the micro switch at the external position bb '. However, in the structure of this embodiment, the rotation of the motor 5 is prevented. The direction of movement is changed by the gear G1 at a right angle, and the gears G2 and G3 are set so that the disc 8 is less than one revolution at all revolutions of the motor 5, and a hole 9 is formed at a predetermined position of the disc 8. 10 and a combination of the optical devices 11 and 11 '(11' is not visible in the figure) incorporating the light emitting element and the light receiving element, the maximum and minimum lengths of the central conductor 1 are detected. That is, when the central conductor 1 moves to the maximum length position, light penetrates the hole 9 to generate an electric signal from the optical device 11, and when it moves to the minimum length position, the light penetrates the hole 10 to generate light. An electric signal is generated from the device 11 '. The generation of this electric signal determines that an abnormality has occurred in the encoder 6 and the potentiometer 7, and controls the motor 5 to stop or reverse the rotation direction to protect the device. G4, G5, and G6 are gears that connect the motor 5, the encoder 6, and the potentiometer 7.

[0009]

[Effect of device]

 According to the present invention, the central conductor is a central conductor having a structure in which one end face is short-circuited and the other end face is carved with a feed screw, so that the central conductor is formed in the hollow cavity region formed by the outer conductor. It can be moved in a straight line, which makes it possible to realize a compact structure of a self-tuning tunable resonator. Even when the miniaturization is realized, a combination of a hole provided at a predetermined position of the disk rotating with the motor for detecting the maximum and minimum lengths of the central conductor and a means for optically detecting this hole position is used. Since the configuration is performed in step 1, it is possible to generate a device protection signal while keeping the resonator structure small.

[Brief description of drawings]

FIG. 1 is an embodiment view of the present invention, (a) is a side view including a partial cross-sectional view showing the entire structure, (b) is a top view of a disc 8;
(C) is a side view showing a positional relationship between the disk 8 and the optical device 11.

FIG. 2 is a block diagram of a conventional technique.

[Explanation of symbols]

 1 central conductor 2 outer conductor 3 bearing 4 shaft 5 motor 6 encoder 7 potentiometer 8 disk 9, 10 hole 11 optical device 12, 13 micro switch 14 contact plate 15-17 gear G1-G6 gear cc 'tubular guide part

Claims (1)

[Scope of utility model registration request] 1. A central conductor is inserted from the other open end side of a hollow cylindrical outer conductor whose one end is short-circuited, and the rotational motion of the motor is converted into a linear motion. In the automatic tuning variable tuning resonator in which the tuning frequency is automatically changed by adjustment, (a) the center conductor (1) is made into a hollow cylindrical shape with one end short-circuited, and the outer conductor (2) is opened. It is slidably arranged in the axial direction in the inner diameter of a cylindrical guide (cc) provided in the center of the end face, and (b) is opened in the center of the other open end of the central conductor (1). The circular motion is converted into a linear motion by engaging the female screw carved on the inner peripheral surface of the circular hole with the male screw carved on the outer peripheral surface of the shaft (4) that rotates integrally with the motor (5). ) Detection of the maximum and minimum lengths of the central conductor (1)
This is performed by an optical device (11, 11 ') that optically detects the position of a hole (9, 10) formed at a predetermined position of a disk (8) that rotates at a low speed using a motor (5) as a drive source and outputs it as an electric signal. , A tunable resonator of automatic tuning characterized by having a structure.