JPH09229135A - Magnetic floating type vibration resistant device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the vibration resistant property, by providing floating magnet plates on which plural magnets magnetized in the diameter direction are set in a circular form, and fixed magnet plates provided in the spaces between the floating magnet plates, in the magnetic floating type vibration resistant device of a pan head device for optical apparatus. SOLUTION: At the surface where K numbers of permanent magnets 10d of the fixed magnet plates 2, and K numbers of permanent magnets 10c of the floating magnet plates 3 are opposed each other, a repulsion force is generated, and it operates as the magnetic floating force of the floating members. And the surface where the permanent magnets 10a at the inner periphery of the fixed magnet rings 4, and the permanent magnets 10b in the outer periphery of the floating magnet plates 3 are opposed each other, also a repulsion force is generated, and the floating members are maintained at the center in the horizontal direction. And, a brake fixing plate 5 burying P numbers of permanent magnets 6 at the lowermost part of a fixed outer tube, and a brake floating plate 7 burying P numbers of permanent magnets 8 at the lowermost part of the floating part, generate attracting forces each other, so as to suppress the horizontal rotation of the floating part floating in the fixed outer tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is attached to a television camera, a photographic camera, or a rangefinder that is mounted on a traveling vehicle, a ship, or an aircraft to monitor the surrounding conditions so that stable photographing or observation can always be performed. The present invention relates to a magnetic levitation type vibration isolator in a pan head device for optical equipment that can be used.

[0002]

2. Description of the Related Art Conventionally, a magnetic levitation vibration isolation table 100 consists of a rotary disk 101 and a rotary disk pedestal 102, as shown in FIGS. The detailed structure is as follows. A rotating shaft 101 is provided with a central shaft 103 at a lower center thereof, penetrates a shaft hole at the center of the rotating disk pedestal 102, and the rotating disk 101 is connected to a rotating angle control motor via a vibration isolation rotating coupler 104. The rotating force from 105 causes the rotating disk pedestal 102 to rotate horizontally. The rotating disk 101 was magnetically levitated above the rotating disk pedestal 102 in the space at the center of the cylindrical concave surface of the upper surface of the rotating disk pedestal 102 by the magnetic repulsive force of the permanent magnets 111, 112, 113. The method of actually floating the rotating disk 101 to the center above the rotating disk base 102 and isolating the vibration is as follows.
N sets of three types of sector-shaped ferromagnetic permanent magnets of the permanent magnets 111, 112, 113 are prepared, and magnetized so that the respective opposing magnetic poles have the same pole and have the same magnetic flux density in each magnetic pole direction. Let A permanent magnet 111 is provided in the rotating disk 101 and the rotating disk pedestal 102, which are made of a non-magnetic metal conductor, on the lower surface of the rotating disk 101 at a ratio of 1 / A of the entire circumference.
Radially embedded in the same angle of N, the permanent magnets 112 on the inner circumference of the side surface of the rotating disk seat 102, and the permanent magnets 113 on the bottom surface of the cylindrical recess on the upper surface of the rotating disk seat 102 at the same angle of 1 / N of the entire circumference. Embed radially. The central axis 103 of the rotating disc 101 is the rotating disc base 102.
When the rotating disk 101 is mounted on the rotating disk pedestal 102 so as to pass through the central axis of the rotating disk 1, the rotating disk 1 is vertically moved by the repulsive force of the same magnetic poles of the permanent magnets 111 and 113.
01 floats in the space, and moreover, the permanent magnet 111 of the rotating disk 101 and the permanent magnet 112 of the rotating disk pedestal 102.
The rotating disk 101 is held in the space by the repulsive force between the magnetic poles so as to be positioned at the center of the rotating disk seat 102 in the horizontal direction. A central shaft 103 vertically projecting downward from the lower center of the rotating disk 101 penetrates a central shaft hole of the rotating disk pedestal 102 and is connected to a rotating shaft of a rotation angle control motor 105 via a vibration isolation rotating coupler 104. I was The rotation angle control motor 105 rotates the rotating disk 101 and also serves as a brake to prevent the rotating disk 101 from freely rotating horizontally when stopped.

[0003]

In the above-mentioned prior art, when the weight of the television camera, the photographic equipment, the optical observation equipment, and the measuring equipment for suppressing the vibration mounted on the rotating disk 101 increases, Permanent magnet 1 for levitating the rotating disc 101 in the vertical direction in order to secure a vertical space gap between the disc 101 and the rotating disc seat 102.
The magnetic flux density of 11 and the permanent magnet 113 must be increased or the facing area must be expanded. There is no binding force in the vertical upward direction other than the total weight of the rotating disk 101 mounted and fixed on the TV camera, the photographic device, the optical observation device, and the measuring device, and there is no defense against a vertical upward impact. The central shaft 103 of the rotary disk 101 and the rotary drive shaft of the rotation angle control motor 105 are vibrated and isolated.
The vibration isolation rotary coupler 104 is connected at 04.
However, due to the limitation of the vibration isolation characteristic, it is impossible to completely eliminate the influence of the rotational vibration of the rotation angle control motor 105 or the vertical and horizontal vibrations of the rotation angle control motor 105 on the rotating disk 101. It was

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to arrange a plurality of vertically magnetized magnets in an annular shape so as to radially magnetize a plurality of magnets. A floating magnet plate, which is annularly arranged on the outer circumference of the magnet, is stacked and fixed in the vertical direction via a spacer, and a floating portion composed of stacked floating magnet bodies is fixed to the central axis, and fixed magnets are provided in the respective space portions of the floating portion. A plate is loosely fitted to serve as a fixed portion, and the opposing surfaces are made to be repulsive magnetic poles. A brake magnet is provided to the inner surface of the circular hole at the bottom of the fixed portion. It is characterized in that equipment that requires vibration isolation is mounted.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 is an upper disk plate, 2 is a fixed magnet plate, 3 is a floating magnet plate, 4 is a fixed magnet ring, 5 is a brake fixing plate,
6 is a permanent magnet for fixing a brake, 7 is a brake floating plate, 8 is a permanent magnet for a brake floating plate, 9 is a central axis bolt of a floating portion, 1
Reference numeral 0a is a fixed magnet ring permanent magnet, 10b is a permanent magnet for holding the center of the floating magnet plate, 10c is a permanent magnet for vertically floating the floating magnet plate, 10d is a fixed magnet plate permanent magnet, 11 is a floating magnet plate spacer, and 12 is a laminated fixing bolt. , 13 are long spacers.

As permanent magnets for magnetic levitation, K × (N−1) pieces of floating magnet plate vertical levitation permanent magnets 10c,
K × N fixed magnet plate permanent magnets 10d, B × K × (N−1) fixed magnet ring permanent magnets 10a and floating magnet plate center holding permanent magnets 10b are prepared. In the examples, B is 2, K is 6, and N is 5. As the brake permanent magnets, P fixed brake permanent magnets 6 and brake floating plate permanent magnets 8 are prepared. In the example, P is 4. The fixed magnet ring permanent magnet 10a and the floating magnet plate vertical levitation permanent magnet 10c are magnetized in the magnetic pole direction shown in FIG. The permanent magnet 10b for holding the center of the floating magnet plate is shown in FIG.
It is magnetized in the magnetic pole direction shown in FIG. The fixed magnet plate permanent magnet 10d is magnetized in the magnetic pole direction shown in FIG. The brake fixed permanent magnet 6 and the brake floating plate permanent magnet 8 are shown in FIG.
As shown in FIG. 4, it is magnetized in the magnetic pole direction. As described above, the magnetized permanent magnets are embedded in the respective predetermined positions and arrangements. That is, as shown in FIG. 11, fixed magnet plate permanent magnets 10d are embedded in the fixed magnet plate 2 in such a manner that K magnetic poles N are arranged in the center evenly arranged. As shown in FIG. 15, in the floating magnet plate 3, permanent magnets 10b for holding the center of the floating magnet plate are embedded so that the magnetic poles S are evenly distributed inside the center of the K magnets. B × K pieces are embedded around the floating magnet plate 3. B × K fixed magnet ring permanent magnets 10 a are embedded in the inner circumference of the fixed magnet ring 4. As shown in FIG. 20, inside the brake fixing plate 5, the brake fixing permanent magnets 6 are evenly embedded so that the magnetic poles S are directed toward the center, and on the outer periphery of the brake floating plate 7, as shown in FIG. The magnets 8 are evenly embedded so that the magnetic pole S faces the center.

As described above, the plates in which the respective permanent magnets are embedded are assembled in the following manner to establish the partial structure. That is, the long spacer 13 is passed through the floating portion central axis bolt 9 that passes through the center of the upper disk plate 1, and then the floating magnet plate 3 is mounted so that the magnetic pole S faces upward and passes through the central hole. The spacer 11 and the floating magnet plate 3 are repeatedly inserted in the middle of a plurality of sets, and the floating magnet plates 3 are mounted so as to be arranged at equal intervals.
3 and the brake floating plate 7 are mounted through, and fixed by tightening with a nut that fits the tip screw of the floating part central axis bolt 9.
FIG. 6 shows an example in which the floating magnet plate 3 has four layers and the brake floating plate 7 has one layer. The fixed magnet plate 2 having the laminated fixing bolts 12 penetrating through the surrounding through holes of the laminated fixing bolts 12 is placed so that the magnetic pole S of the floating magnet plate vertical levitation permanent magnet 10c faces upward, and then the fixed magnets. The rings 4 are stacked so that the laminated fixing bolt 12 penetrates the through hole of the laminated fixing bolt 12. Further, the fixed magnet plate 2 and the fixed magnet ring 4 are repeatedly stacked in the middle of a plurality of sets, and the brake fixing plate 5 is stacked on the uppermost part, and tightened and fixed with a nut that fits the tip screw of the laminated fixing bolt 12, and finally turned upside down. . As an assembly example, the fixed magnet plate 2 has five layers,
4 layers of fixed magnet ring 4, 1 piece of brake fixing plate 5
An example of a layer is shown in FIG. Fig. 5 Fixed outer cylinder part and Fig. 6
FIG. 2 shows an embodiment in which the floating portion is actually combined. In addition,
The above description of the assembling situation is merely a description of the structure of the present invention, and is not a description of an actual assembling procedure for the sake of convenience.

Next, the operation will be described. As shown in FIG. 2, the floating portion of FIG. 6 is magnetically levitated in the vertical direction inside the fixed outer cylindrical portion of FIG. That is, K fixed magnet plate permanent magnets 10d embedded in each fixed magnet plate 2
And the K floating magnet plates vertically floating permanent magnets 10c embedded in the floating magnet plate 3 are opposed to each other in the vertical direction, the polarities of the magnetic poles are S and S, or N.
And N to generate repulsive force. Here, the sum of the repulsive forces of the layers between the floating magnet plate 3 of each layer and the fixed magnet plate 2 immediately thereunder acts as magnetic levitation of the floating portion. or,
The floating portion of FIG. 6 is held in the horizontal center while maintaining a vertical axis inside the fixed outer cylinder portion of FIG. That is, B × K per layer embedded in the inner circumference of the fixed magnet ring 4.
The fixed magnet ring permanent magnet 10a and the B × K floating magnet plate center-holding permanent magnets 10b embedded in the outer periphery of the floating magnet plate 3 on the surface facing each other in the horizontal direction are magnetic poles. Since the polarities are the same, repulsive force is generated, and the floating portion is held at the center in the horizontal direction by the action of the vector sum of the repulsive force of the B × K group. The brake fixing plate 5 in which P pieces of the brake fixing permanent magnets 6 at the bottom of the fixed outer cylinder portion are embedded and the brake floating plate 7 in which P pieces of the brake floating plate permanent magnets 8 at the bottom of the floating portion are embedded are the brake floating plate. Since the magnetic poles of the permanent magnets 8 and the brake fixing permanent magnets 6 have different polarities, an attractive force is generated between the permanent magnets 8 to suppress the horizontal rotation of the floating portion floating in the fixed outer cylindrical portion. Here, if the magnetic force of the P sets of brake fixed permanent magnets 6 and the magnetic force of the brake floating plate permanent magnets 8 are sufficiently smaller than those of the fixed magnet ring permanent magnet 10a and the floating magnet plate center-holding permanent magnet 10b, the floating portion will be horizontal. The center position of the direction and verticality are not impaired.

A more detailed description will be given below of the overall operation when the magnetic levitation vibration isolator has the above structure. The fixed outer cylinder part and the floating part are not in contact at all, and are completely spatially blocked. The sum of repulsive force between the floating magnet plate 3 of each layer and the fixed magnet plate 2 immediately below it acts as magnetic levitation of the floating portion, and conversely, the floating magnet plate 3 of each layer and the fixed magnet plate 2 immediately above it. The total repulsive force between them has an action (damping action) of suppressing the vertical vibration applied from the outside together with the weight of an object mounted on the upper disk plate 1 and requiring vibration isolation.

[0010]

The present invention has the following effects. Since the fixed outer cylinder portion and the floating portion are not in contact with each other and are completely spatially blocked, it is possible to prevent the vibration propagation from any direction from the outside to be transmitted to the floating portion. In order to suppress the overexcitation phenomenon that occurs at the frequency that shows resonance among the vibrations given from the outside, especially the vertical vibration frequency, it is possible to eliminate redundant natural vibration (surging phenomenon) in a short time. The upper disk plate 1 can have a degree of freedom to cope with the weight of an object mounted. That is, when the weight is light, the number of layers of the fixed outer cylinder portion and the floating portion is small, and when the weight is large, the number of layers is large, and it is not necessary to change the outer shapes of the fixed outer cylindrical portion and the floating portion. Since it is small, even in the case of a large vibration-isolated device, it is possible to easily attach a plurality of vibration-isolated devices to appropriate positions, and to prevent vibrations from external vibrations by a combined effect. Since the brake fixing permanent magnet embedded in the brake fixing plate 5 below the fixed outer cylinder part and the brake floating plate permanent magnet embedded in the brake floating plate 7 in the floating part attract each other, the center of the fixed outer cylinder part The external vibration is not transmitted to the floating portion which is floated and held in the space, and the horizontal rotation is suppressed while the external vibration is blocked.

[Brief description of drawings]

FIG. 1 is a perspective view of an external structure of an embodiment of the present invention.

FIG. 2 is a side partial cross-sectional view of FIG.

FIG. 3 is a top view of FIG. 2;

4 is an enlarged cross-sectional view of FIG.

5 is an assembly diagram of the fixed outer cylinder portion of FIG. 1. FIG.

6 is an assembly view of the floating portion of FIG. 1. FIG.

7 is a central shaft bolt of FIG.

8A is the spacer of FIG. 6, and FIG. 8B is the long spacer of FIG.

9 is a top view of the upper disc plate of FIG. 1. FIG.

10 is a partial cross-sectional side view of the upper disc plate of FIG.

11 is a top view of the fixed partition plate of FIG. 1. FIG.

FIG. 12 is a partial cross-sectional side view of the fixed partition plate of FIG.

13 is a top view of the fixed magnet ring of FIG. 1. FIG.

14 is a partial cross-sectional side view of the fixed magnet ring of FIG.

15 is a top view of the floating magnet plate of FIG. 1. FIG.

16 is a partial cross-sectional side view of the floating magnet plate of FIG.

FIG. 17 is a perspective view of a fixed magnet ring permanent magnet 10d and a floating magnet plate vertical levitation permanent magnet.

FIG. 18 is a perspective view of a permanent magnet for holding the center of a floating magnet plate.

FIG. 19 is a perspective view of a fixed magnet ring permanent magnet.

FIG. 20 is a top view of a brake fixing plate. .

FIG. 21 is a partial cross-sectional side view of the brake fixing plate.

FIG. 22 is a partial cross-sectional side view of the brake floating plate.

FIG. 23 is a top view of the brake floating plate.

FIG. 24 is a perspective view of a brake fixed permanent magnet and a brake floating plate permanent magnet.

FIG. 25 is a main configuration diagram of a conventional magnetic levitation vibration eliminator.

FIG. 26 is a partial cross-sectional side view of a conventional magnetic levitation anti-vibration table.

FIG. 27 is a view as seen from the direction of the arrow BB ′ of FIG. 26;

28 is a downward arrow view of AA ′ of FIG. 26. FIG.

29 is an enlarged cross-sectional view of FIG. 26.

FIG. 30 is an external perspective view of the bottom permanent magnet of the rotating disk seat.

FIG. 31 is an external perspective view of a permanent magnet on the inner peripheral portion of the rotating disk seat.

FIG. 32 is an external perspective view of a permanent magnet of a rotating disk.

[Explanation of symbols]

 1 Upper Disc Plate 2 Fixed Magnet Plate 3 Floating Magnet Plate 4 Fixed Magnet Ring 5 Brake Fixing Plate 6 Brake Fixed Permanent Magnet 7 Brake Floating Plate 8 Brake Floating Plate Permanent Magnet 9 Floating Center Shaft Bolt 10a Fixed Magnet Ring Permanent Magnet 10b Floating Magnet Permanent magnet for plate center holding 10c Floating magnet plate Permanent magnet for vertical levitation 10d Fixed magnet plate Permanent magnet 11 Floating magnet plate spacer 12 Laminated fixing bolt 13 Long spacer

Claims (1)

[Claims] 1. A floating magnet plate in which a plurality of vertically magnetized magnets are annularly arranged, and a plurality of radially magnetized magnets are annularly arranged on the outer periphery of the magnets with a spacer interposed therebetween. A floating portion composed of laminated floating magnets that are stacked and fixed in the vertical direction is fixed to the central axis, and fixed magnet plates are loosely fitted and disposed in each space of the floating portion to make fixed portions, and the opposing surfaces are repulsion magnetic poles. None, a brake magnet is provided on the inner surface of the circular hole at the bottom of the fixed portion, the opposing surface magnetic pole is used as an attraction magnetic pole, and an optical device such as an optical device is mounted on the floating portion. Magnetic levitation type vibration isolation device.