JP2597191B2 - Surface accuracy inspection equipment for parabolic reflectors - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for inspecting whether or not a reflecting surface of a manufactured parabolic reflector is manufactured as designed.

[Prior Art] The accuracy of the reflecting surface of a parabolic reflector greatly affects the characteristics and performance of the parabolic antenna. For example, a reflector used for a 12-GHz band parabolic antenna for satellite broadcasting or the like receives the received light. Accuracy that suppresses variation within a few percent of the wavelength of about 25 mm is required. Since a conventional inspection apparatus for inspecting whether or not the parabolic reflector has such accuracy requires three-dimensional measurement, the three-dimensional distance is measured one point at a time on the reflecting surface of the parabolic reflector to be inspected. In order to know the irregularities of the parabolic reflector to be inspected, or to scan the entire reflective surface of the parabolic reflector to be inspected using an optical three-dimensional measuring machine, and to know the irregularities of the reflective surface .

[Problems to be solved by the invention] However, when measuring a three-dimensional distance one point at a time,
It takes a long time to perform the measurement, and there is a problem that it is unsuitable when the surface accuracy of each mass-produced parabolic reflector must be measured. Further, when a three-dimensional measuring machine is used, the three-dimensional measuring machine is expensive, and there is a problem that it is too expensive to inspect the surface accuracy of the parabolic reflector.

An object of the present invention is to provide an apparatus for inspecting the surface accuracy of a parabolic reflector, which solves the above problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fixing table,
A plurality of mounting holes provided on the upper surface side of the fixed base, and one reference parabolic reflector selected from a plurality of different reference parabolic reflectors on the upper surface of the fixed base. When arranged in a facing state, it is mounted on a desired one of the mounting holes so as to contact various positions on the reflection surface of the selected reference parabolic reflector,
The contact state is set as a reference state, and the parabolic reflector to be inspected corresponding to the selected reference parabolic reflector is placed on the fixed base in the same state as the selected reference parabolic reflector. A plurality of detectors that abut against the reflecting surface of the parabolic reflector to be inspected to generate an output corresponding to a vertical displacement from the reference state, and output from these detectors. Input means for calculating the degree of variation of the parabolic reflector to be inspected with respect to the selected reference parabolic reflector; comparing the calculated degree of variation with a predetermined evaluation value of the degree of variation to obtain the inspection object; Of the parabolic reflector, and output means for visually outputting the result of the determination.

[Operation] According to the present invention, when one reference parabolic reflector selected from a plurality of different reference parabolic reflectors is arranged on the upper surface of the fixed base such that the reflecting surface faces the fixed base, The detector is mounted on a desired one of the mounting holes so as to contact various positions on the reflection surface of the selected reference parabolic reflector. After attaching the detector in this manner, the selected reference parabolic reflector is removed, and the corresponding parabolic reflector to be inspected is placed on the fixed base in the same state as the selected reference parabolic reflector. At this time,
Each detector contacts various positions of the reflecting surface of the parabolic reflector to be inspected, and outputs a state where each detector is in contact with the selected reference parabolic reflector, that is, a displacement from the reference state. . No mechanical operation is required to obtain these outputs. The output of each of these detectors is input to the variation calculating means, and the variation is calculated. Then, the calculated degree of variation is compared with a predetermined degree of variation evaluation value to determine whether or not the parabolic reflector to be inspected is acceptable, and this determination result is output to the output means so as to be visible.

[Embodiment] In this embodiment, as shown in FIG. 3, a fixed base 2 having a rectangular shape is provided. On the upper surface of the fixed base 2, a parabolic reflecting mirror 4 to be inspected is provided with a reflecting surface thereof. Positioning members 6, 6, 6 are provided for positioning at a predetermined position on the upper surface of the fixed base 2 in a state where is facing the upper surface side of the fixed base 2.

As shown in FIG. 4, a circular recess 8 is provided at a position on the upper surface of the fixed base 2 where the parabolic reflecting mirror 4 covers, and a circular protrusion 10 is provided at the bottom center of the recess 8. ing. On the bottom of this recess 8 and on the top of the projection 10,
A plurality of spindle type detectors 12 are provided. These detectors 12 are arranged so as to come into contact with each part of the reflecting surface of the reference parabolic reflector in a state where the reference parabolic reflector is disposed on the upper surface of the fixed base 2 in the same manner as the parabolic reflector 4 to be inspected. ing. Then, in order to make the output from each of these detectors 12 substantially zero when in contact with the reflecting surface of the reference parabolic reflecting mirror, the adjusting nut 14 and the lock nut 16 are used as shown in FIG. Adjust the mounting position of the detector 12. Each of these detectors
12 is to detect the length from the reference state in the range of ± 3mm (measurement range of the detector) from the state where the tip part moves forward and backward when the tip comes into contact with the object and the output becomes zero (reference state) Can be done. In this way, since the length can be detected from the reference state, when the tip comes into contact with the reference parabolic reflector or the parabolic reflector to be inspected, the tip moves these parabolic reflectors from the reflecting surface side to the back side. It is pushing up to the side. In addition, 18 shown in FIG.
Is a mounting hole of the detector 12, for example, the type of the parabolic reflector 4 to be inspected is different. With the currently mounted detector 12 alone, it is necessary to obtain the degree of variation of each part of the other parabolic reflector 4. Have been pre-drilled to add a detector 12 if insufficient. When inspecting another type of parabolic reflector, the mounting of each detector 12 is readjusted.

As shown in FIG. 2, the output of each detector 12 is sequentially transmitted to a digital electronic micrometer 22 through a detector switch 20.
Supplied to This digital electronic micrometer 22
Digitizes the input output of the detector 12, digitizes the output on a display attached to the digital electronic micrometer 22, and supplies the digital value to the control computer 24.

The control computer 24 is connected to each input detector.
While creating a data table of 12 outputs, a calculation of the degree of variation is performed, the result of this calculation is compared with a predetermined evaluation value of the degree of variation, pass / fail judgment is made, and the judgment result etc.
It is displayed on T26 and printed by the printer 28.
The control computer 24 also controls the detector switch 20 and the digital electronic micrometer 22. This control uses the GP-IB bus interface
A digital signal from the digital electronic micrometer 22 (a digital signal output from the detector 12) is also supplied to the control computer 24 via the GP-IB bus interface 30. Therefore, the detector switch 20 and the digital electronic micrometer 22 are provided with GP-IB bus interface units 32 and 34, respectively.

The operation of the surface accuracy inspection apparatus configured as described above is described in the first section.
The program of the control computer 24 shown in the figure will be described based on the flow chart. Before this program is executed, the reference parabolic reflector is placed on the fixed base 2, the respective detectors 12 are adjusted as described above, and the parabolic reflector to be inspected as shown in FIG. 4 are arranged on the fixed base 2, and each detector 12 contacts the reflecting surface of the parabolic reflecting mirror 4 to be inspected as shown in FIG. 5 and FIG. It is assumed that output signals indicating the degree of unevenness of the corresponding position in the reflecting mirror are generated. When the reference parabolic reflector and the parabolic reflector to be inspected are placed on the fixed base 2, they are distorted by their own weight, but since both are placed in the same state, the distortions produced are almost the same. In other words, when the parabolic reflector to be inspected is arranged on the fixed base 2, the output generated by each detector is hardly affected by distortion. In addition, since each detector is in contact with any of the reflecting mirrors so as to lift them from below (the reflecting surface side), the detector 12 is in contact with the reflecting surface of the reflecting mirror. It works to cancel the distortion and does not increase it.

In this state, the control computer 24
By operating a keyboard (not shown) attached to the camera, the date for inspection, the type of the parabolic reflector 4 to be inspected, the lot number, the serial number, the name of the person in charge, etc. are set (step S2). . Then, the set data is transferred to CRT2
6 is displayed (step S4). Then, it is determined whether or not a signal indicating that the setting by the keyboard has been performed is input by, for example, operating the keyboard (step S6). If the answer is NO, the process returns to step S2 and the setting is performed again. .

If the answer to step S6 is YES, the output of a certain detector 12 is supplied to the detector switch 20 by a digital electronic micrometer.
Supply a control signal to supply the control signal to step 22 (step S
8) Then, a control signal is supplied to the digital electronic micrometer 22 so as to sample the input of the detector 12 and digitize the output (step 8).
S10). This allows the digital electronic micrometer 22
Digitizes the input output of the detector 12, displays the digital value on an attached display, and supplies the digital value to the control computer 24.

Following step S10, control computer 24
Inputs a digital signal from the digital electronic micrometer 22 (step S12), and determines whether the value is within the maximum measurement range of the detector 12 ± 3 mm (step S14). If the answer is NO, the data is incorrect, so the process returns to step S6 and the digital electronic micrometer
Start over from input to 22. If the answer to step S14 is YES, the input data is input to the data table (step S16), the degree of variation is calculated (step S18), and the calculated degree of variation is displayed on the CRT 26 (step S20). . Then, it is determined whether the input data of the detector 12 is the data of the last detector 12 (step
S22) If the answer is NO, the process returns to Step S8, where the data of the next detector 12 is input, and Steps S10 to S22 are repeated. That is, the control computer 24 calculates the degree of variation using the displacement data from the reference state of each part of the reflecting surface of the parabolic reflecting mirror 4 to be inspected, while inputting the data into the data table. As the calculation of the degree of variation, for example, a maximum value, a minimum value, an average value, a standard deviation, and a root mean square are calculated.

If the answer to step S22 is YES, that is, the last detector
When twelve outputs are input and finally the calculation of the maximum value, the minimum value, the average value, the standard deviation, and the variation of the root mean square is performed, it is determined in advance according to the type of the parabolic reflector 4 to be inspected. The calculated pass / fail determination comparison value (variation degree evaluation value) is compared with the calculated variation degree, and if this variation degree is satisfied, it is determined whether the product is acceptable (step S24).
If this answer is YES, an indication that CRT 26 has been passed,
Date, type of reflector, lot number, serial number, name of person in charge, shape diagram corresponding to multiple measurement positions on the reflective surface (position where each detector 12 touched), output of each detector 12, and degree of variation Is displayed (step S26), and the above-described C
The same one as displayed on RT26 is printed (step S28).
If the answer in step S24 is NO, that is, if the answer is
Indication of rejection of RT26, date, reflector type, lot number, serial number, person in charge, shape diagram corresponding to multiple measurement positions on reflective surface, output of each detector 12, degree of variation Is displayed (step S30), and the printer 28 prints the same one as the display on the CRT 26 (step S3).
2).

Subsequent to step S28 or S32, it is determined whether or not the inspection is the last parabolic reflector 4 of the inspection (step S34).
If it is O, the number of the next parabolic reflector to be inspected is set (step S36), and the process returns to step S4 to perform the same inspection as described above. If the answer to the step S34 is YES, the inspection is completed and the operation is stopped.

In the above embodiment, the GP-IB interface unit 32,
Although the ones provided with each of the 34 are used, those without these can be used. In the above embodiment, the detector switch 20 and the digital electronic micrometer 22 are configured to be controlled by the control computer 24 via the GP-IB bus interface. A signal generation unit may be provided, or an A / D conversion command signal generation unit dedicated to the digital electronic micrometer 22 and a transmission unit that transmits a digital signal from the digital electronic micrometer 22 to the control computer 24 may be provided exclusively.

[Effects of the Invention] As described above, according to the present invention, each of the detectors has a corresponding one of the plurality of different reference parabolic antennas. Of these, because it is attached to the desired one, the reference parabolic antenna is various, such as a rotating parabolic parabolic reflector, even if it is an offset parabolic reflector,
The surface accuracy can be measured, and the same surface accuracy can be measured even for the same type having different diameters. Further, a gauge for determining the mounting state of each detector is not required. Then, after attaching each detector in this way, simply place the parabolic reflector to be inspected on the fixed base in the same state as the reference parabolic reflector, and the surface accuracy of the parabolic reflector to be inspected is automatically adjusted. , The time required for the inspection can be greatly reduced. Therefore, even when a large number of parabolic reflectors of the same type are inspected, the inspection can be performed efficiently. further,
According to the present invention, since the detector comprises a relatively inexpensive detector, a dispersion degree calculating means constituted by, for example, a control computer, a pass / fail judgment means, and an output means, the cost is low. Yes, the cost required for inspecting the surface accuracy of the parabolic reflector can be reduced. Moreover, in the present invention, since both the reference parabolic reflector and the parabolic reflector to be inspected are arranged in the same state on the fixed base, the distortion caused by the weight of both parabolic reflectors is substantially the same, When each detector comes into contact with the reflection surface of the parabolic reflector to be inspected, the detection output generated by each detector is hardly affected by distortion due to its own weight, and the measurement accuracy of the surface accuracy is improved. Even if, instead of the reference parabolic reflector, a gauge having the same shape as that of a part of the parabolic reflector to be inspected is used and each detector is adjusted so as to come into contact with this gauge, only a small portion of the parabolic reflector is used. The distortion caused by its own weight on the gauge having only the shape of the part differs from the distortion caused by its own weight on the parabolic reflector to be inspected. The influence greatly affects the surface accuracy.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a program of a control computer used in an embodiment of a surface accuracy inspection apparatus according to the present invention, FIG. 2 is a block diagram of the embodiment, and FIG. 3 is a surface accuracy of a parabolic reflector in the embodiment. FIG. 4 is a perspective view showing a state where the detector is being inspected, FIG. 4 is a perspective view showing a state where the detector is attached to the fixed base in the embodiment, FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a sectional view taken along the line BB of FIG. 3, and FIG. 7 is a view showing an attached state of the detector in the present embodiment. 2 ... fixed base, 12 ... detector, 24 ... control computer (variation degree calculating means, judgment means), 26 ... CR
T (output means), 28 ... printer (output means).

Claims (1)

(57) [Claims] 1. A fixed base, a plurality of mounting holes provided on an upper surface side of the fixed base, and one reference parabolic reflector selected from a plurality of different reference parabolic reflectors on the upper surface of the fixed base. When the reflecting surface is arranged in a state facing the fixed base side, it is attached to a desired one of the mounting holes so as to contact various positions of the reflecting surface of the selected reference parabolic reflecting mirror, The contact state is set as a reference state, and the parabolic reflector to be inspected corresponding to the selected reference parabolic reflector is placed on the upper surface of the fixed base in the same state as the selected reference parabolic reflector on the fixed base. Then, a plurality of detectors that come into contact with the reflecting surface of the parabolic reflector to be inspected and generate outputs according to the vertical displacement from the reference state, and outputs from these detectors are input. The above inspection target Calculating means for calculating the degree of dispersion of the laboratory reflector with respect to the selected reference parabolic reflector; comparing the calculated degree of dispersion with a predetermined degree of dispersion evaluation value to determine whether the parabolic reflector to be inspected is acceptable or not; An apparatus for inspecting the surface accuracy of a parabolic reflector, comprising: a determining means for determining; and an output means for visually outputting the determination result.