JPS6320168Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism for adjusting the frequency of a dielectric resonator.

A dielectric resonator is formed of a dielectric material such as a ceramic sintered body, and is combined with an oscillation circuit amplifier, etc.
This is housed in a conductor case to constitute an oscillator, and the frequency of this oscillator is determined by the dielectric constant and external dimensions of the dielectric.

By the way, it is known that the resonant frequency of a dielectric resonator can be adjusted by external influences when a metallic substance is brought closer or closer to the dielectric resonator.

Conventionally, the structure for adjusting the oscillation frequency of a dielectric resonator is as shown in FIG. Screw together the metal screw 4,
The frequency was adjusted by rotating the screw 4 to move it toward and away from the dielectric resonator 1.

However, the structure with threaded screws as described above,
Some of the screws protrude outside the case, which causes the overall shape to become larger.Also, since the screws protrude outside the case, the external appearance is also poor. Further, since the structure is such that a screw is simply screwed into a screw hole, there is a problem that rotation occurs due to vibration, causing a change in the adjustment frequency, and it is also difficult to lock the screw due to space considerations.

This idea was made in order to eliminate the above-mentioned drawbacks and problems.The amount of protrusion to the outside of the case is small, the overall shape is smaller, and the appearance is improved. It is an object of the present invention to provide a frequency adjustment mechanism that does not cause errors.

The configuration of this device is that an adjustment member is rotatably attached to a case that houses a dielectric resonator, a rotation operation part is provided on the part of the adjustment member that is exposed on the outside of the case, and the adjustment member is located inside the case. A frequency adjustment section is provided in a section that moves toward and away from the dielectric resonator when the adjustment member is rotated, and the frequency is adjusted by changing the position of the adjustment section due to rotation of the adjustment member.

Embodiments of this invention will be described below with reference to FIGS. 2 to 5 of the accompanying drawings.

As shown in FIG. 2, the dielectric resonator 1 is mounted on the bottom member 5 in the metal case 2 via the substrate 6,
A circular hole 7 is provided on the upper wall of the case 2 at a position offset from directly above the dielectric resonator 1.
A frequency adjustment member 8 is rotatably attached to the portion.

As shown in FIGS. 3 to 5, the frequency adjustment member 8 is made by overlapping and integrating an upper disk 9 and a lower disk 10, each having a slightly larger diameter than the circular hole 7.
The peripheral edge of the circular hole 7 is held between the holes formed on the outer periphery between the upper and lower disks 9 and 10, and is rotatable within the circular hole 7.

The frequency adjustment member 8 protrudes from the outer surface of the case 2 by the thickness of the upper disk 9, so the amount of protrusion is extremely small, and there is no change in the amount of protrusion even when rotated, and the upper disk 9 can be engaged with a screwdriver. A groove-like rotation operation portion 11 is provided.

In addition, the lower disk 10 is provided with a dielectric resonator 1 during rotation.
A frequency adjustment section 12 is provided at a position near and far from the center, in the case of illustration, at a position on the outer periphery.

This adjustment part 12 is formed by a downward tongue piece provided integrally with the lower disk 10, and when the adjustment member 8 is rotated, the adjustment part 12, which is eccentric with respect to the center of rotation, is connected to the dielectric resonator 1. resonator 1
This is to change the external influence on the oscillation frequency and adjust its oscillation frequency.

As described above, according to this invention, a frequency adjustment member is rotatably attached to a case in which a dielectric resonator is housed, and a rotation operation part is provided on the part of the adjustment member exposed on the outer surface of the case, and a rotation operation part is provided inside the case. Since the frequency adjustment part is located at a position that moves toward and away from the resonator when rotated, the amount of protrusion of the adjustment member to the outside of the case is reduced, and the amount of protrusion does not change even when rotated. , the overall shape can be made smaller, and
The external shape can be improved.

In addition, since the adjustment member is rotatably attached to the case, the adjustment member will not rotate naturally due to vibrations, etc. after frequency adjustment by moving the adjustment unit toward or away from the resonator. No deviations occur after frequency adjustment.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing a conventional frequency adjustment mechanism, Fig. 2 is a longitudinal sectional front view of the adjustment mechanism according to this invention, Fig. 3 is an enlarged longitudinal sectional view of the adjustment member in the same above, and Fig. 4 is the same plane. FIG. 5 is a bottom view of the same. DESCRIPTION OF SYMBOLS 1... Dielectric resonator, 2... Case, 7... Circular hole, 8... Adjustment member, 9... Upper disk, 10...
...lower disc, 11...rotation operation section, 12...adjustment section.

Claims (1)

[Scope of utility model registration request] A circular hole is provided in the upper wall of the metal case that houses the dielectric resonator in a position offset from directly above the dielectric resonator, and an upper disk with a slightly larger diameter than the circular hole is inserted into the circular hole. and a lower disk are overlapped and combined into one, the periphery of the circular hole is held between the outer circumferences of the upper and lower disks, and a frequency adjustment member rotatable within the circular hole is attached. A frequency adjustment mechanism, characterized in that a frequency adjustment section is provided at a position near and far from a dielectric resonator during rotation.