JPH0352019Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sub-reflector of a Cassegrain antenna.

[Prior Art] Conventionally, as shown in FIG. 4, this type of sub-reflector has a reference hole 10 provided only at the tip of the reflecting surface side on the mirror axis of the sub-reflector 15 formed integrally. I was making installation adjustments.

[Problems to be solved by the invention] In order to accurately adjust and fix the sub-reflector with the reference hole provided at the tip of the reflecting surface at the desired position on the mirror axis of the main reflector, it is necessary to The methods shown in Figures 3 to 5 were used. In FIG. 3, a mirror 16 with a target engraved on it is attached to the reference hole 10 of the sub-reflector 15, and the mirror 16 of the sub-reflector 15 is viewed with an optical collimator 17 set on the mirror axis of the main reflector. In this method, the inclination and eccentricity are adjusted, and the height is measured using a tape measure. This method requires skill in handling and adjusting the optical collimators, and has the problem that it takes a long time to adjust each collimator separately and gradually adjust it.

In addition, the method shown in Figure 4 is based on the mirror axis of the main reflecting mirror.
A positioning jig 18 to be inserted into the reference hole 10 of the sub-reflector 15 is set, and the sub-reflector 15 is placed on this jig 18 for positioning. In this case, in order to increase the accuracy of the tilt of the sub-reflector 15, the sub-reflector 1
It is necessary to increase the diameter of the pedestal of the jig 18 on which the jig 18 is placed, which increases the weight of the jig and makes it extremely difficult to handle.

Furthermore, in FIG.
In this method, the height and eccentricity are determined using a jig 18, and the inclination is adjusted using a dial gauge 19. This adjustment is performed by rotating the dial gauge 19 on the circumference of the sub-reflector reflecting surface.
Tilt the sub-reflector 15 so that the readings of 9 are the same,
Since it is necessary to repeat the adjustment many times, this also has the problem of increasing the adjustment time. An object of the present invention is to solve these problems and provide an antenna sub-reflector that is easy to handle and requires less time for installation and adjustment.

[Means for Solving the Problems] The antenna sub-reflector of the present invention has a reference hole on the reflecting surface side of the sub-reflector and a cover on the back surface of the sub-reflector so as to pass through the mirror axis of the integrally molded sub-reflector. A side through-hole is provided, and these reference holes and the through-hole serve as a centering reference for the mirror shaft.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a side sectional view of an embodiment of the present invention placed on a surface plate. First, set the mirror axis centering jig 2 on the surface plate 5, place it on it through the reference hole 10 of the reflective surface of the sub-reflector 1 to determine its axis, and then A guide plate 3 is passed through a jig 2 protruding from the holder and fixed to the back cover of the sub-reflector 1 with bolts 4. From this mirror axis centering jig 2 to the sub-reflector 1
When removed, a sub-reflector 1 with a reference hole 10 penetrating the mirror axis is obtained.

FIG. 2 is a side view when assembling and adjusting the sub-reflecting mirror 1 of this embodiment to be fixed on the mirror axis of the main reflecting mirror 6. The positioning jig 7 fixed to the mirror axis of the main reflecting mirror 6 is set by passing through the reference hole 10 of the sub-reflecting mirror 1.

Next, after fixing the spherical end fitting 8 to the sub-reflector mounting support 9, the positioning jig 7 is taken out. Sub-reflector 1
is fixed exactly in place with the desired precision.

[Effects of the invention] As explained above, the sub-reflector according to the invention prevents eccentricity, inclination, and Since the height can be simultaneously positioned at a predetermined position with the desired accuracy, there is no need for any conventional adjustment process, and the time required for positioning and adjusting the sub-reflector can be significantly shortened.

In addition, when using the sub-reflector of the present invention, it is possible to position and install the sub-reflector even when the main reflector is tilted, taking into account the deflection of the sub-reflector mounting bracket while facing the communication direction. Another advantage is that it is possible to position the sub-reflector.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of this embodiment during positioning and installation, Fig. 3 is a sectional view of a conventional sub-reflector during installation adjustment, Fig. 4, FIG. 5 is a side view showing another conventional method for attaching and adjusting the sub-reflector. In the figure, 1, 15... Sub-reflector, 2... Mirror axis centering jig, 3... Guide plate, 4... Bolt, 5
... Surface plate, 6 ... Main reflector, 7, 18 ... Positioning jig, 8 ... Ball end fitting, 9 ... Mounting support, 10
...Reference hole, 11...Through hole, 16...Mirror,
17...Optical collimator, 19...Dial gauge,
It is.

Claims (1)

[Scope of utility model registration request] A reference hole on the reflective surface side and a through hole on the rear cover side of the sub-reflector are provided so as to pass through the mirror axis of the integrally molded sub-reflector, and these reference holes and the through hole are connected to the mirror axis. An antenna sub-reflector characterized by being adapted to serve as a centering reference.