KR20120022572A - Vibration-isolation system - Google Patents

Abstract

PURPOSE: A vibration isolation system is provided to reduce required costs by using a coil spring instead of an air spring. CONSTITUTION: A vibration isolation system(1) comprises a first vibration sensor(15), a first controlling force applying unit(5), a second vibration sensor, and a second controlling force applying unit(7). The first vibration sensor detects the vertical vibration of the system. The first controlling force applying unit has a first actuator for applying vertical controlling force to the system. The second vibration sensor detects the horizontal vibration of the system. The second controlling force applying unit has a second actuator for applying horizontal controlling force to the system. The first controlling force applying unit and/or the second controlling force applying unit are accepted in a space between upper and lower plates(11,21).

Description

Vibration damper {VIBRATION-ISOLATION SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration suppression apparatus supported by a spring element in order to insulate a precision instrument such as an electron microscope from minute vibrations such as the floor.

Conventionally, this type of vibration damping device is known as a so-called passive type vibration damping table which supports a table on which an apparatus is mounted on a top surface thereof by a flexible spring element such as, for example, an air spring or a coil spring. .

For example, the vibration and the position of the vibration damping object supported by an air spring (for example, Japanese Patent No. 3372975) or a coil spring (for example, Japanese Patent Application Laid-Open No. 2007-78122) are applied to the sensor. An active type vibration damping device is also known which adds a vibratory control force to attenuate the vibration to the vibration damping object by detecting the feedback signal and driving the actuator by feeding back the detection signal.

By the way, the above-mentioned conventional active damping apparatus (henceforth an active damping apparatus) has the following problems. That is, the conventional active vibration suppression apparatus, in addition to the spring element, is provided with a sensor and an actuator for two directions, usually vertical and horizontal, respectively, so that extremely high vibration damping performance can be obtained in the vertical and horizontal directions. On the other hand, it is a fairly expensive device.

However, among the users, there is a user who wants to obtain high vibration damping performance in only one of the vertical and horizontal directions. Such a user purchases a relatively inexpensive manual vibration suppression device having a lower vibration damping performance than an active vibration suppression device, or a function that is unnecessary for the user (a horizontal vibration suppression function for a user who wants to obtain high vibration damping performance only in the vertical direction). In addition, there is a problem that a user who wants to obtain high vibration damping performance only in the horizontal direction has no choice but to purchase an expensive active vibration damping device having a vertical vibration damping function.

In addition, many active vibration suppressors include spring elements, various sensors, and actuators, as well as electric motors for automatic level adjustment for keeping the height of the surface plate constant, and controllers for controlling these devices. As a result, since the active vibration damping device usually has a width of 230 mm or more, a depth of 230 mm or more, and a height of 180 mm or more, there is a problem that the active vibration damping device cannot meet the user's request for using the active vibration damping device in a narrow space. .

In order to solve these problems, it is conceivable to make a special order for a small active vibration suppression device having only the functions desired by the user. However, the special order product requires a large manufacturing cost or the need to add another function later. If there is a problem, it is necessary to purchase a new active vibration damper itself, or to disassemble the housing manufactured in small size, add such other functions, and replace it with a large housing.

This invention is made | formed in view of such a point, Comprising: It aims at providing the compact and inexpensive vibration damper which has the performance requested by a user.

In order to achieve the above object, in the present invention, a function expansion for expanding the function of this manual vibration suppression apparatus is based on a manual vibration suppression apparatus which supports the base plate via a coil spring on a foundation via an upper plate and a lower plate. The control force adding device, which is a device, has a compact structure in which the vibration sensor and the actuator are modularized, and is detachable from the top plate so as to meet various user requirements.

Specifically, in the first invention, the upper plate supporting the surface plate, the lower plate mounted on the base, and between the upper plate and the lower plate are mounted on these two plates, and the device mounted on the surface plate is mounted on the base by a coil spring. It is aimed at a vibration suppression device having a passive vibration suppression device supporting vibration suppression.

And a first vibration force for detecting a vertical vibration of the device, a first control force adding device in which a first actuator for applying a control force in the vertical direction with respect to the device is modularized, and / or the horizontal of the device. A second control force adding device in which a second vibration sensor for detecting vibration in a direction and a second actuator for applying a control force in a horizontal direction with respect to the device are accommodated in a space between the upper plate and the lower plate, It is characterized in that it is configured to be detachably mounted to the top plate.

In the first aspect of the invention, first, a passive vibration isolator adopting a coil spring which is cheaper than an air spring is used as a basic device. As a result, a low cost passive vibration suppression device comprising a top plate, a bottom plate, and a passive vibration suppression device can be provided for a user who does not need an expensive active vibration suppression device.

Subsequently, when the user wishes to add a control force in the vertical or horizontal direction to the passive vibration suppression device, the first or second control force adding device, which is a function expansion device, is mounted on the upper plate on which the passive vibration suppression device is mounted. Feedback control in the horizontal direction can be executed. Accordingly, an active vibration damping device can be provided for a user who needs only feedback control in one of the vertical and horizontal directions or a user who needs to control these at a price suitable for the required function.

In addition, when the user wants to add the control force in the vertical and horizontal directions to the passive vibration suppression device, it is possible to execute the feedback control in the vertical and horizontal directions by attaching both of the first and second control force adding devices to the upper plate. Become.

As described above, the first and second control force adding devices are each formed in a compact structure in which the vibration sensor and the actuator are modularized so that they are housed in a space between the upper plate and the lower plate, respectively. Even if it is attached, the whole damping apparatus can be made small.

According to the above, it becomes possible to provide a small and inexpensive vibration damping device with the performance required by the user.

According to a second aspect of the present invention, in the first invention, the first control force adding device accommodates the first vibration sensor in a state in which the axis thereof is in a vertical direction, and below the first vibration sensor, the first actuator. The first actuator has a stator fixed to the upper plate via the housing, and reciprocating in a vertical direction with respect to the stator, the control force in the vertical direction to the device by contacting the lower plate And a stator and the mover are connected by a rubber elastic body.

According to the second aspect of the present invention, since the stator and the movable body are connected to each other by a rubber elastic body as the first actuator, the vibration of the foundation from being transmitted to the stator side through the movable body can be suppressed by the rubber elastic body. In addition, unlike the stator and the mover having a separate type (the stator is mounted on the upper plate and the mover on the lower plate, respectively), the first control force adding device can be added simply by mounting the housing on which the stator is accommodated on the upper plate. Therefore, installation work becomes easy.

According to a third aspect of the present invention, in the first or second aspect of the invention, the second control force adding device accommodates the second vibration sensor in a state in which the axis thereof is in a horizontal direction, and below the second vibration sensor. And a housing for accommodating a second actuator, wherein the second actuator reciprocates in parallel with the stator fixed to the upper plate via the housing, in parallel with the axial direction of the second vibration sensor, It is characterized in that it has a mover for adding a control force in the horizontal direction to the device by contacting the passive vibration suppressing device, and the stator and the mover are connected by a rubber elastic body.

According to the third aspect of the invention, similar to the second aspect of the invention, it is possible to suppress transmission of vibrations from the base (passive vibration damper mounted on the lower plate) to the stator side by the rubber elastic body, and add a second control force adding device. Installation work becomes easy.

In this case, the vibration sensor and the actuator are generally arranged such that the axis of the vibration sensor and the retraction shaft of the actuator are located in a straight line in order to perform accurate vibration control. The second vibration sensor and the second actuator are overlapped up and down so as to be accommodated in the space therebetween (not too wide in the horizontal direction), in other words, such that the axis of the second vibration sensor and the retraction axis of the second actuator are parallel to each other. To place.

In this way, even when the second vibration sensor and the second actuator are disposed, in the present invention which miniaturizes the vibration suppression device itself, the interval between the axis of the second vibration sensor and the vertical axis of the second actuator is narrow, so that the precision is high. Vibration control can be performed.

Therefore, it becomes possible to attain both miniaturization of the second control force adding device and accurate vibration suppression control in the horizontal direction.

4th invention WHEREIN: In any one of said 1st-3rd invention, attaching and detaching the control apparatus for controlling the said control force addition apparatus with respect to this lower board so that it may be accommodated in the space between the said upper board and the said lower board. It is characterized in that possible configuration.

According to the fourth aspect of the present invention, in addition to the first and second control force adding devices, a control device for controlling them can be added to the vibration suppression device based on the passive vibration suppression device as a basic device. Since it is comprised so that it may be accommodated in the space between lower boards, the damping apparatus which has a function equivalent to the conventional damping apparatus can be made very small.

According to a fifth aspect of the present invention, in the fourth invention, the passive vibration suppression apparatus, the first and second control force adding devices, and the control device are arranged in two rows and two columns in a plane in the space between the upper plate and the lower plate. It is characterized by.

According to the fifth aspect of the invention, by arranging four devices in two rows and two columns in a plane, the space between the upper plate and the lower plate can be utilized effectively, and the vibration suppression device can be made compact.

According to the vibration suppression apparatus according to the present invention, since the passive vibration suppression device employing the coil spring which is inexpensive compared to the air spring is the basic device, the user who does not need the active vibration suppression device includes the upper plate, the lower plate and the passive vibration suppression device. While it is possible to provide a low-cost passive vibration suppression device, and the user wants to add control force in the vertical and / or horizontal direction to the passive vibration suppression device, the first and / or second control force adding device, which is a function expansion device, By later mounting on the top plate, it is possible to provide an active vibration device capable of performing feedback control in the vertical and / or horizontal directions.

In this way, the first and second control force adding devices have a compact structure in which the first and second control force adding devices themselves are accommodated in the space between the upper plate and the lower plate by modularizing the vibration sensor and the actuator, respectively. And the whole vibration suppression apparatus including the second control force adding device can be made compact.

1 is a perspective view showing a vibration suppression apparatus according to the present embodiment.
FIG. 2: is a side view which demonstrates typically the state which damp-proofs an apparatus with respect to the floor using a damping apparatus. FIG.
3 is a perspective view showing a case where the spring unit is used alone.
4 is a perspective view illustrating a case where a spring unit, a vertical unit, and a control unit are combined.
5 is a perspective view showing a case where a spring unit, a horizontal unit, and a control unit are combined.
6 is a perspective plan view of a vibration suppression apparatus.
FIG. 7 is a side view illustrating an arrow a in FIG. 6. FIG.
FIG. 8 is a side view illustrating arrow B in FIG. 6.
9 is a perspective view showing a spring unit.
10 is a longitudinal sectional view of the spring unit.
Figure 11 (a) is a side view showing a vertical unit.
Figure 11 (b) is a side view showing a vertical unit.
12 is a longitudinal sectional view schematically showing the structure of a vertical voice coil motor.
Figure 13 (a) is a side view showing a horizontal unit.
Figure 13 (b) is a side view showing a horizontal unit.
Fig. 14 is a wiring block diagram for explaining connection between a vibration suppression apparatus, an acceleration sensor for detecting vibration of the floor, and a power supply.
Fig. 15 is a plan view schematically illustrating an arrangement example of a vibration suppression apparatus when supporting a surface plate.
Fig. 16 is a plan view schematically illustrating an arrangement example of a vibration suppression apparatus when supporting a surface plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the invention, its application, or its use. In addition, in the following figures, in order to make drawing easy to see, illustration of the wiring which electrically connects the control unit 9 and the vertical and horizontal units 5 and 7 is abbreviate | omitted.

1 is a perspective view showing a vibration suppression apparatus according to the present embodiment. As shown in Fig. 2, the vibration damping apparatus 1 is susceptible to vibration, for example, a precision measuring apparatus such as a semiconductor-related manufacturing apparatus, an atomic force microscope, or a laser microscope. It mounts the precision instrument 31, and installs it in the state isolate | separated from vibration of the floor (base) 51 as much as possible. In other words, the illustrated vibration damping apparatus 1 is comprised so that the surface plate 41 in which the precision instrument 31 is mounted may be damped with respect to the floor 51. In the vibration damping apparatus 1, the surface plate 41 and the precision equipment 31 mounted thereon (including the top plate 11 and the like, which are described below in detail) are the vibration damping targets.

The vibration damping apparatus 1 is formed between an upper plate 11 supporting the surface plate 41, a base plate 21 mounted on the bottom 51, and the upper plate 11 and the lower plate 21. Spring units (passive damping devices) 3 mounted on these plates 11 and 21 for damping and supporting the surface plate 41 on which the precision instruments 31 are mounted by the coil springs 13 with respect to the floor 51. ), And this spring unit (3) is the basic device.

That is, in this vibration damping apparatus 1, even if the vertical and horizontal units 5 and 7 mentioned later are removed as shown in FIG. 3, the upper board 11, the lower board 21, and the spring unit 3 are carried out. A passive type vibration damping device configured as described above, which is configured to be capable of damping and supporting a vibration damping object with respect to the floor 51.

In this way, in the vibration suppression apparatus 1, the vertical acceleration sensor (first vibration sensor) 15 for detecting the vibration in the vertical direction of the precision device 31 and the control force in the vertical direction with respect to the precision device 31 are applied. The upper plate is accommodated in the space between the upper plate 11 and the lower plate 21 so that the vertical unit (first control force adding device) 5 in which the vertical voice coil motor (first actuator) 25 for addition is modularized is accommodated. It is comprised so that it may be detachably attached with respect to (11). In this way, the vertical unit 5 is formed by itself as a compact structure by modularizing the vertical acceleration sensor 15 and the vertical voice coil motor (hereinafter referred to as vertical VCM) 25. In addition, the control unit (control device) 9 for controlling the vertical unit 5 is detachably mounted to the lower plate 21 so as to be accommodated in the space between the upper plate 11 and the lower plate 21. It is composed.

In this way, in the case where it is desired to obtain a greater vibration damping effect in the vertical direction, as shown in FIG. As the vibration suppressor 1, the vibration suppressor 1 may be mounted on the vibration suppression apparatus 1, and in the state in which the vertical unit 5 is mounted, the vibration state in the vertical direction of the precision device 31 supported by the coil spring 13 may be adjusted. 15) detects and feeds this back to drive the vertical VCM 25 to reduce the vertical vibration of the precision instrument 31.

In the vibration suppression apparatus 1, a horizontal acceleration sensor (second vibration sensor) 17 for detecting the horizontal vibration of the precision instrument 31 and a control force in the horizontal direction with respect to the precision instrument 31 are added. The horizontal board (second actuator) 27 to be horizontally modularized (the second control force adding device) 7 is adapted to be accommodated in the space between the upper plate 11 and the lower plate 21, so that the upper plate ( 11) and is detachably mounted. In this way, the horizontal unit 7 is formed by itself as a compact structure by modularizing the horizontal acceleration sensor 17 and the horizontal voice coil motor (hereinafter referred to as horizontal VCM) 27.

In this way, in the case where it is desired to obtain a greater vibration damping effect in the horizontal direction, as shown in Fig. 5, when the horizontal unit 7 and the control unit 9 are attached to the vibration suppression apparatus 1 as a function expansion device, In the state in which the horizontal unit 7 is mounted, the horizontal acceleration sensor 17 detects the vibration state in the horizontal direction of the precision device 31 and feeds it back to drive the horizontal VCM 27 to drive the precision device ( It becomes possible to reduce the horizontal vibration of 31).

In addition, in the case where it is desired to obtain a greater vibration damping effect in both the vertical and horizontal directions, as shown in FIG. What is necessary is just to attach it to the vibration damper 1.

Placement of each unit

Next, the arrangement and installation structure of the spring unit 3, the vertical unit 5, the horizontal unit 7 and the control unit 9 will be described. Here, in the following description, the case where the spring unit 3 as the basic device is combined with the vertical and horizontal units 5 and 7 as the function expansion device and the control unit 9 for controlling the same will be described. The arrangement and installation structure in the case of using the spring unit 3 alone or in the case of combining the vertical unit 5 or the horizontal unit 7 are almost the same.

In this vibration suppression apparatus 1, as shown in FIG. 6, the spring unit 3, the vertical unit 5, the horizontal unit 7, and the control unit 9 are between the upper board 11 and the lower board 21. As shown in FIG. In space, two rows and two columns are arranged in a plane. More specifically, the spring unit 3 is disposed at the upper right of FIG. 6, the vertical unit 5 is disposed at the lower right of FIG. 6 so as to be adjacent to the spring unit 3, and the horizontal unit 7 is It is arranged in the upper left of FIG. 6 so as to be adjacent to the spring unit 3, and the control unit 9 is arranged in the lower left of FIG. 6 so as to be located in a diagonal direction with respect to this spring unit 3.

In this way, by arranging the four units 3, 5, 7, and 9 in two rows and two columns in a plane, the space between the upper plate 11 and the lower plate 21 is utilized effectively, so that the vibration damping device 1 is planarized. Can be made compact. This and the sensor 15, 17 and the VCM 25, 27 are modularized, and the vertical and horizontal units 5, 7 are miniaturized, and so on. In general, the vibration damping apparatus 1 according to the present embodiment has a size of 230 mm or more, 230 mm or more, and 180 mm or more in height. Become.

The spring unit 3 has four bolts inserted into the four bolt holes 53a, 53a, ... formed in the top half of the housing 53 by screwing from above (upper plate 11 side). (Not shown), the four bolts are attached to the upper plate 11 and inserted into the four bolt holes (not shown) formed in the base block 23 by screwing from below (lower plate 21 side). It attaches to the lower board 21 by this. Thus, since the spring unit 3 is attached to the upper board 11 and the lower board 21, even when this spring unit 3 is used alone as a manual vibration damper, the upper board 11 and the lower board 21 are used. ) Is not separated.

6 and 7, the vertical unit 5 is inserted into the two bolt holes 35d and 35d formed in the flange portions 35c and 35c of the first housing 35 by screwing from below. The two bolts 36a and 36a are attached to the upper plate 11 from the lower side, and penetrate the first housing 35 in the horizontal direction (through holes 35e formed in the first housing 35). It is also attached to the housing 53 of the spring unit 3 by two long bolts 36b, 36b, ... (not shown in FIG. 6) inserted through 35e). Thus, since the vertical unit 5 can be bolted from the lower side with respect to the upper plate 11, when adding this vertical unit 5 to a manual type vibration damper, the surface plate 41 etc. were mounted. In this state, the vertical unit 5 can be mounted later on the top plate 11. Here, the vertical unit 5 is not fixed to the lower plate 21.

On the other hand, the horizontal unit 7 is, as shown in Fig. 6 and 8, by the bolt 38a inserted into the bolt hole 37c formed in the flange portion of the second housing 37 by screwing from below, In addition to being attached to the upper plate 11 from the lower side, it is also attached to the housing 53 of the spring unit 3 by four long bolts 38b, 38b, ... which penetrate the second housing 37 in the horizontal direction. do. In this way, the horizontal unit 7 can be bolted from the lower side with respect to the upper plate 11, and thus, similarly to the vertical unit 5, the horizontal unit 7 is mounted on the upper plate with the surface plate 41 or the like mounted thereon. It becomes possible to attach to 11 later. Here, the horizontal unit 7 is not fixed to the lower plate 21 similarly to the vertical unit 5.

As shown in Fig. 6, the control unit 9 is mounted from the upper side to the lower plate 21 by four bolts inserted into the four bolt holes 9a, 9a,... On the other hand, it is not fixed to the upper plate 11.

Here, in the example shown in FIG. 6, the vertical and horizontal units 5 and 7 are arranged adjacent to the spring unit 3, but the contact member 70 is attached to the contact wall portion 23c of the spring unit 3 as described below. Units other than the horizontal unit 7 that are in contact with each other (vertical unit 5, control unit 9, etc.) do not necessarily need to be disposed adjacent to the spring unit 3.

Next, the structures of the spring unit 3, the vertical unit 5, the horizontal unit 7 and the control unit 9 will be described.

Spring Unit

9 and 10, the spring unit 3 has a base block 23 mounted on the lower plate 21 and a leveling which moves up and down with respect to the base block 23 in accordance with rotation about an up and down axis. The coil spring 13 mounted on the leveling block 33 via the block 33 and the ball bearing unit 63, the upper end of which is always in contact with the upper plate 11, and the lower end of the base block 23. And a center pin 43 on which the surgeless rubber 73 is mounted, and a housing 53 for protecting the coil spring 13.

The base block 23 combines the square part 23a which has the shape which cut off a pair of diagonal part which is square in planar view in substantially circular arc shape, and the square plate-shaped plate part 23b up and down. It is formed into a shape. A portion of the plate portion 23b corresponding to the cutout of the circumference 23a is formed with a through hole 23d penetrating in the vertical direction, and the shaft portion extending upward from the floating stopper 83 accommodated in the cutout ( 83a) is inserted into this through hole 23d.

The center portion of the base block 23 has a circular cross section larger in diameter than the through holes 23d and 23d so as to be sandwiched between two through holes 23d and 23d, and a worm screw on the circumferential wall. The screw recess 23e in which the female screw of the cut off is formed. And the through hole 23f which penetrates the base block 23 up and down is formed in the center of this screw recess 23e. The screw portion 33a of the leveling block 33 is inserted into the screw recess 23e by screwing, while the center pin 43 is inserted into the insertion hole 23f.

Moreover, the contact wall part 23c which the contact member 70 of the horizontal VCM 27 of the horizontal unit 7 contact | connects is a pair of diagonal parts in which the cut-out part of this base block 23 was formed, and the other diagonal part. On the other hand, as shown in FIG. 6, the other diagonal portion (located at one corner of the lower plate 21) makes it easy to attach a bolt or the like for fixing the lower plate 21 to the bottom 51 or the like. In a plan view, the incision is almost arcuate.

The leveling block 33 is a top and bottom combination of a cylindrical housing portion 33b having a bottom in which the lower end of the coil spring 13 is received, and a cylindrical screw portion 33a from which a male screw of a worm screw is cut. It is formed in the shape of the shape, and it is rotatably mounted in this base block 23 by inserting such a screw part 33a into the screw recess 23e of the base block 23 by screwing.

Four insertion holes 33c, 33c, 33c, 33c are formed in the bottom part of this housing part 33b at equal intervals in the circumferential direction, and a leveling block 33 is inserted by inserting a tool into this insertion hole 33c. ) Rotates around the up and down axis, the leveling block 33 is configured to move up and down relative to the base block 23. In this way, the leveling block 33 is rotated by rotating the leveling block 33 in accordance with the elastic deformation of the coil spring 13 which is accommodated in the leveling block 33 and whose upper end is in contact with the upper plate 11. When moving up and down with respect to the block 23, the lower end position of the coil spring 13 is adjusted, and it is comprised so that the height of the upper board 11 may remain substantially constant. Thus, employing a manual leveling mechanism instead of automatic level adjustment using an electric motor or the like also contributes to miniaturization of the vibration suppression apparatus 1 of the present embodiment.

Here, the height adjustment is made in a state where the precision instrument 31 is mounted on the surface plate 41, that is, in a state where a load is applied to the coil spring 13, and thus the lower end of the coil spring 13 and the housing portion 33b. Since the friction with the bottom is so high that it is difficult to rotate the leveling block 33 manually, the friction between the lower end of the coil spring 13 and the bottom of the housing part 33b is reduced to reduce the friction of the leveling block 33. In order to ensure smooth rotation, the ball bearing unit 63 which interposed the several steel balls 63a, 63a, ... by the upper and lower pair of annular resin covers 63b and 63b is arrange | positioned. In addition, an insertion hole 33d penetrating in the vertical direction is formed in the center portion of the leveling block 33 (more precisely, the bottom portion of the housing portion 33b and the screw portion 33a). The center pin 43 is formed to be inserted through.

The center pin 43 is inserted through the annular ball bearing unit 63, the insertion hole 33d of the leveling block 33, and the insertion hole 23f of the base block 23 from above, As shown in FIG. 9, it is fixed to the base block 23 by the nut screwed to the lower end part. Further, a bolt head 43a is formed at the upper end of the center pin 43, and the surgeless rubber 73 is attached to the bolt head 43a.

The surgeless rubber 73 is made of a substantially cylindrical rubber and is inserted into the loop of the coil spring 13, and is pressed up and down to contact the inner circumferential surface of the spring loop, thereby damping the vibration of the coil spring 13 or Or suppressing surging (a phenomenon in which the external force frequency transmitted to the coil spring 13 becomes large when the natural frequency of the spring approaches the spring itself). Since the surgeless rubber 73 is attached to the bolt head 43a of the center pin 43 fixed to the base block 23 as described above, the height does not always change. In other words, by rotating the leveling block 33 about the axis in the vertical direction, even if the leveling block 33 moves up and down and the amount of expansion and contraction of the coil spring 13 changes, the position of the surgeless rubber 73 Since the shape (state of contact with the inner circumferential surface of the spring loop) does not change at all, it is possible to maintain a constant amount of attenuation by the surgeless rubber 73.

Here, if the leveling block 33 is continuously raised, the leveling block 33 and the base block 23 may be separated from the base block 23 in the near future, but in the vibration suppression apparatus 1 of the present embodiment, If the leveling block 33 is to be raised above a predetermined amount, the ball bearing unit 63 is configured to be in contact with the bolt head 43a of the center pin 43, so that the leveling block 33 is the base block 23. It is configured so as not to fall off. That is, the center pin 43 not only supports the surgeless rubber 73 but also serves to suppress the leveling block 33 from being released from the base block 23.

The housing 53 is for protecting the coil spring 13, and has a square shape in plan view, and is formed in a rectangular tube shape having a top portion having a circular cross section therein, as described above. And the top plate 11. Here, the corner portion of the housing 53 located at one corner of the upper plate 11 is viewed in plan view as shown in FIG. 9 in order to facilitate mounting of a bolt or the like for fixing the upper plate 11 to the surface plate 41. It is cut almost in an arc shape.

In the top half of the housing 53, a through hole 53b is formed at the center thereof and penetrates in the vertical direction. The upper end portion of the coil spring 13 is inserted into the through hole 53b. Touch the bottom surface of the Moreover, the inner diameter of the housing 53 is formed larger than the outer diameter of the leveling block 33, and it is comprised so that the movement of the up-down direction of the leveling block 33 which a part is accommodated in this housing 53 may not be inhibited. In other words, this housing 53 is attached to the lower surface of the upper plate 11 supported by the coil spring 13 in a non-contact state with the coil spring 13 and the leveling block 3.

The housing 53 is connected to the upper end of the shaft portion 83a of the floating stopper 83. The shaft portion 83a is a base block (3) in a state where the precision instrument 31 is mounted on the surface plate 41. It is set to the length which a clearance of several millimeters generate | occur | produces between the lower surface of the plate part of 23) and the floating stopper 83 accommodated in the cutout part of the base block 23. As shown in FIG. Accordingly, in the state where the precision instrument 31 is mounted on the surface plate 41 (the coil spring 13 is retracted), the floating stopper 83 and the base block 23 connected to the housing 53 are not in contact. In the state where the precision device 31 is removed from the surface plate 41 (the coil spring 13 is extended) while the vibration damping performance of the coil spring 13 is not affected at all, the upper plate 11 is coiled. Even if it is pushed upward by the spring 13, the floating stopper 83 is in contact with the base block 23, so that the upper plate 11, the lower plate 21, the housing 53 and the base block 23 are not separated. It is composed.

Vertical Unit

The vertical unit 5 includes a vertical acceleration sensor 15 for detecting the vertical vibration of the precision instrument 31, a vertical VCM 25 for applying a control force in the vertical direction with respect to the precision instrument 31, A first housing 35 for accommodating them, and a loop bracket 45 for fixing the vertical acceleration sensor 15 and the vertical VCM 25 to the first housing 35 are provided.

In the first housing 35, as shown in FIG. 11A, an upper recess 35a that opens upward and a lower recess 35b that opens downward from the upper recess 35a downward. Is formed. As shown in FIG. 11B, the vertical acceleration sensor 15 is accommodated in the upper concave portion 35a with the axis facing in the vertical direction, while the vertical VCM 25 is the vertical acceleration sensor 15. The vertical acceleration sensor 15 and the vertical VCM 25 are accommodated in the lower concave portion 35b so that the axis of the vertical axis and the advancing axis of the vertical VCM 25 (the reciprocating axis of movement of the actuator) are on a straight line. ) Is integrated through the first housing 35. In this way, since the vertical acceleration sensor 15 and the vertical VCM 25 are arranged such that the axis of the vertical acceleration sensor 15 and the advancing axis of the vertical VCM 25 are located in a straight line, the vertical unit 5 is It is possible to perform accurate vibration suppression control.

In this way, a signal indicating the relative acceleration of the upper plate 11 (vibration state of the upper plate 11) is output from the vertical acceleration sensor 15, and the control unit 9 receives the signal to the vertical VCM 25. A control signal is output, and as shown in FIG. 7, the contact member 70 is in contact with the lower plate 21, so that a control force for damping the vibration in the vertical direction is added to the vibration isolating object.

Next, the structure of the vertical VCM 25 will be described in detail with reference to FIG. The vertical VCM 25 is divided into a stator fixed to the upper plate 11 via the first housing 35 and a mover mounted in a non-contact state and driven vertically by electromagnetic force. . The stator is concentrically housed in the downwardly open iron yoke 60 formed in a cylindrical shape with a top portion serving as a housing, and the barrel wall portion 60a of the yoke 60, and has a bolt (on the top portion 60b). 84 is composed of a disk-shaped magnet 64 and a pole piece 62 which are bolted by a bolt.

The top portion 60b of the yoke 60 is provided with threaded holes in four portions at intervals in the circumferential direction, and the yoke 60 is formed by the bolts 74, 74,... It is connected to the bracket (45). The bracket 45 is engaged with the flange portion 15a protrudingly arranged on the outer circumference of the cylindrical case of the vertical acceleration sensor 15 to fix the vertical acceleration sensor 15 to the yoke 60.

In addition, the magnet 64 and the pole piece 62 are composed of a relatively thick disk having substantially the same diameter and having the same thickness. At the upper end of the pole piece 62, a diametral reduction is formed in a step shape so that a circumferential groove is formed between the magnet 64, and a rubber O-ring 76 made of high attenuation rubber in the circumferential groove. Is fitted. The pole piece 62 is formed with a concave portion 62a having a circular cross section so as to be opened almost in the center thereof, and a coil spring for pushing the bobbin 78 constituting the mover downward to the concave portion 62a ( 66) is inserted.

On the other hand, the movable member includes a bottomed cylindrical bobbin 78 made of a resin material, a coil 68 formed by winding an electric wire around the tubular wall portion 78a, and a bottom wall portion of the bobbin 78 ( And a contact member 70 disposed at 78b). The bobbin 78 is opened upward and arranged so that the shaft center and the yoke 60 coincide with each other, and the wall portion 78a surrounds the magnet 64 and the pole piece 62 in a non-contact state, while the yoke 60 It is enclosed in the non-contact state by the cylindrical wall part 60a of ().

In this way, the inner circumferential surface of the cylindrical wall portion 78a of the bobbin 78 arranged on the same axis is in contact with the outer circumference of the O-ring 76 inserted into the circumferential groove of the pole piece 62, so that the pole piece 62 and the magnet are in contact with each other. While maintaining the distance between the outer circumferential surface of 64 and the inner circumferential surface of the cylindrical wall portion 78a of the bobbin 78 at a predetermined size, the outer peripheral surface of the cylindrical wall portion 78a of the bobbin 78 and the cylindrical wall portion of the yoke 60 ( 60a) is also configured to maintain a distance from the inner surface to a predetermined size.

In addition, the bottom wall portion 78b of the bobbin 78 has a relatively thick disc shape, and a diaphragm (rubber elastic body) is formed between the outer circumferential portion of the lower surface of the bobbin 78 and the lower end surface of the cylindrical wall portion 60a of the yoke 60. Linked by 80. The diaphragm 80 allows the relative movement in the vertical direction of the bobbin 78 by allowing the front circumference to be largely bent between the bottom wall portion 78b of the bobbin 78 and the cylindrical wall portion 60a of the yoke 60. In addition, both side portions which sandwich this bobbin 78 are bent in reverse phase, thereby allowing the bobbin 78 to swing.

Moreover, the lower end of the coil spring 66 in which the upper part penetrated the pole piece 62 recessed part 62a is in contact with the upper surface of the bottom wall part 78b of the bobbin 78. The coil spring 66 is preliminarily compressed to press the bobbin 78 downward even in the absence of an external force, thereby not only pushing up the top plate 11 but also generating a control force in the direction of pulling it down. Can be. The amount of preliminary compression is determined by the interval between the lower surface of the pole piece 62 and the upper surface of the bottom wall portion 78b of the bobbin 78. In this embodiment, the height of the upper plate 11 is determined by the leveling block 33. Since it is kept substantially constant, the preliminary compression amount is also kept substantially constant.

That is, the bobbin 78, which is a mover in the vertical VCM 25, is maintained in a non-contact state with respect to the yoke 60, which is the stator, by the O-ring 76 and the diaphragm 80, and is vertically driven by the electromagnetic force. The reciprocating motion of the lower plate 21 outputs a control force in the vertical direction between the lower plate 21 and the upper plate 11, and is kept rotatable in the horizontal direction.

Further, a circular pedestal 78c is formed in the bottom wall portion 78b of the bobbin 78 reciprocating in the vertical direction so as to swell downward of the inner circumferential side portion thereof, and this pedestal 78c ), A contact member 70 for contacting the lower plate 21 and transmitting a control force is inserted into the concave portion 78d of the circular cross section which is opened almost at the center. The contact member 70 is formed by, for example, molding a resin material such as MC nylon into a circumferential shape and making the tip (lower part of the drawing) a spherical convex part, while the flange part is provided on the base end (upper part of the drawing). As a result, the outer diameter of this flange portion becomes almost the same diameter as the inner diameter of the recess 78d. The pressing plate 82 overlaps the lower surface of the base portion 78c, and a round hole having a diameter substantially the same as the outer diameter of the contact member 70 except for the flange portion is formed, and the flange portion is formed by the peripheral portion of the round hole. By being pressed, the contact member 70 is prevented from coming off.

Here, since the coil spring 72 disposed in the recess 78d has a considerably higher spring constant than the coil spring 66 that pushes the bobbin 78 downward, the coil spring 72 is usually hardly contracted and is subjected to excessive external force. This is for the first time when the pole piece 62 and the bobbin 78 are in contact with each other, to prevent them from being damaged.

As described above, since the stator and the mover use the integrated vertical VCM 25 connected by the diaphragm 80 made of silicone rubber as the actuator, the vibration from the bottom 51 is transmitted to the stator via the mover. In addition to being able to be suppressed by the 80, the stator and the movable body are separate types (the stator is mounted on the upper plate 11 and the movable member on the lower plate 21, respectively), and the first in which the stator is accommodated. Since the vertical unit 5 can be added only by attaching the housing 35 to the upper plate 11, the installation work becomes easy.

Horizontal Unit

The horizontal unit 7 includes a horizontal acceleration sensor 17 for detecting horizontal vibration of the precision instrument 31, a horizontal VCM 27 for applying a control force in the horizontal direction to the precision instrument 31, and accommodates them. And a second bracket 37 for fastening the horizontal acceleration sensor 17 to the second housing 37.

As shown to Fig.13 (a), the 2nd housing 37 has the upper recessed part 37a opened horizontally, and below this upper recessed part 37a, it is the same as this upper recessed part 37a. The lower concave portion 37b that is opened in the direction is formed. As shown in Fig. 13B, the horizontal acceleration sensor 17 is accommodated in the upper concave portion 37a with the axis facing in the horizontal direction, and the flange portion 17a protrudingly arranged on the outer circumference of the cylindrical case. The bracket 47 engaged with the bolt is bolted to the second housing 37, while the horizontal VCM 27 is in equilibrium with the axis of the horizontal acceleration sensor 17 and the advancing axis of the horizontal VCM 27. It is stored in the recess 37b and bolted to the second housing 37, whereby the horizontal acceleration sensor 17 and the horizontal VCM 27 are integrated through the second housing 37.

In this way, a signal indicating the relative acceleration of the upper plate 11 (vibration state of the upper plate 11) is output from the horizontal acceleration sensor 17 to the horizontal VCM 27 from the control unit 9 receiving the signal. The control signal is output, and the contact member 70 contacts the base block 23 contact wall portion 23c of the spring unit 3, thereby adding a control force for damping the vibration in the horizontal direction to the vibration isolating object.

Here, the horizontal VCM 27 is a flange portion 17a in which a bolt for fixing the yoke of the horizontal VCM 27 to the second housing 37 protrudes on the outer circumference of the cylindrical case of the horizontal acceleration sensor 17. Is not connected to the bracket 47 to be coupled with the contact point, and the contact member 70 is in contact with the contact wall portion 23c of the base block 23 of the spring unit 3 instead of the lower plate 21. In this case, since the structure is almost the same as that of the vertical VCM 25, the description thereof will be omitted, and the same reference numerals as those of the members constituting the vertical VCM 25 are used for each member constituting the horizontal VCM 27.

Here, the vibration sensor and the actuator are generally arranged such that the axis of the vibration sensor and the retraction axis of the actuator are located in a straight line in order to perform accurate vibration control, but in this embodiment, the horizontal unit 7 is the top plate 11. The horizontal acceleration sensor 17 and the horizontal VCM 27 are piled up and down so as to be accommodated in the space between the plate and the lower plate 21 (not too wide in the horizontal direction) (the axis of the horizontal acceleration sensor 17 and the horizontal VCM ( 27) so that the retraction axis is parallel). Thus, even if the horizontal acceleration sensor 17 and the horizontal VCM 27 are arrange | positioned, in this invention which miniaturizes the damping apparatus 1 itself, the axis | shaft of the horizontal acceleration sensor 17 and the retreat shaft of the horizontal VCM 27 are carried out. Since the space | interval of the up-down direction with and is narrow, it becomes possible to perform highly accurate vibration damping control.

Control Unit

The control unit 9 has a first base 19 for controlling the vertical unit 5, a second base 29 for controlling the horizontal unit 7, and a housing 39 for protecting them. do.

Each base 19 and 29 is electrically connected via the power supply 61 and wiring 81 independent from the vibration suppression apparatus 1, as shown in FIG. 14, and is comprised so that electric power may be supplied from this power supply 61. FIG. do. The first base 19 is a vertical acceleration sensor 15 and a vertical VCM 25, and the second base 29 is connected to a horizontal acceleration sensor 17 and a horizontal VCM 27 and wires (not shown), respectively. Interposed and electrically connected. In this way, the first base 19 supplies electric power from the power supply 61 to the vertical acceleration sensor 15 and the vertical VCM 25, while the vertical acceleration from the vertical acceleration sensor 15 is accelerated in the vertical direction. An electrical signal (specifically a current value) relating to is configured to be input to this first base 19. Similarly, the second base 29 supplies power from the power supply 61 to the horizontal acceleration sensor 17 and the horizontal VCM 27, while the second base 29 relates to the horizontal acceleration of the vibration damping object from the horizontal acceleration sensor 17. An electrical signal (specifically a current value) is configured to be input to this second base 29.

These bases 19 and 29 provide feedback control gain Gm to acceleration X "of the vibration damping object obtained from each acceleration sensor 15 and 17, for example, when performing active vibration suppression control of acceleration feedback. The feedback control amount Gc? X` obtained by multiplying the feedback control gain Gc by the feedback X gain obtained by multiplying the feedback control amount Gm? X ″ and the acceleration X ″ once; Moreover, it is comprised so that the feedback control amount Gk * X obtained by multiplying the feedback control gain Gk by the displacement X obtained by integrating acceleration X "twice may be output to each voice coil motor 25 and 27. FIG. do.

In addition, in order to further improve the vibration damping performance, as shown in FIG. 14, a third acceleration sensor (FF unit) 71 for detecting the vibration state of the floor 51 independent of the vibration damping apparatus 1 is added, The third acceleration sensor 71 is electrically connected to the bases 19 and 29 via the wiring 91, and the transmission vibration to the vibration damping object is estimated based on the sensor signal to cancel the transmission vibration. It is also possible to add feed forward control to add control oscillations by the vertical and horizontal VCMs 25 and 27.

Type of use

In the case of supporting the precision device 31 using the vibration suppression apparatus 1 configured as described above, for example, as shown in FIG. 15, the spring unit 3, the vertical unit 5, the horizontal unit 7 and When four vibration damping devices 1 equipped with a control unit 9 are prepared, and the support plate 4 is supported by four points using these, four vertical VCMs 25 control the vibration force in the vertical direction. In addition to the above, the two VCRs 27 and 27 (upper left and lower right of the drawing) control the force for reducing vibration in the X direction of the precision instrument 31. By the horizontal VCMs 27 and 27 of the dog (lower left and upper right of the drawing), it becomes possible to add a control force for reducing vibration in the Y direction of the precision instrument 31, respectively.

When the necessity of reducing the vibration in the horizontal direction is low, for example, as shown in FIG. 16, four vibration damping devices 1 of the spring unit 3 are prepared, and the surface plate 41 is used as a leg. ) Is supported by four points, and the vibration damping device 1 equipped with the spring unit 3, the vertical unit 5, and the control unit 9 is disposed in the center, and is vertically supported by one vertical VCM 25. It is also possible to add a control force to reduce vibration in the direction.

-effect-

In this embodiment, since the spring unit 3 employing the coil spring 13, which is inexpensive compared to the air spring, is used as the basic device, the upper plate 11 and the lower plate are provided for the user who does not need the expensive active vibration damping device. It is possible to provide a low-cost passive vibration damping device including a 21 and a spring unit 3.

When the user wishes to add control force in the vertical or horizontal direction to the spring unit 3, the vertical unit 5 or the horizontal unit 7, which is a function expansion device, is provided with the spring unit 3. By attaching to the upper plate 11, feedback control in the vertical or horizontal direction can be executed. As a result, an active vibration damping device can be provided for a user who needs only feedback control in one of the vertical and horizontal directions or a user who needs these controls at a price suitable for the required performance.

In addition, when the user wants to add the control force in the vertical and horizontal directions to the spring unit 3, by mounting both the vertical and horizontal units 5, 7 on the upper plate 11, the vertical and horizontal feedback control It becomes possible to execute.

In this way, the vertical and horizontal units 5 and 7 modularize the acceleration sensors 15 and 17 and the VCMs 25 and 27, respectively, so that they themselves are accommodated in the space between the upper plate 11 and the lower plate 21. Since the structure is compact, even if these vertical and horizontal units 5 and 7 are mounted, the whole vibration suppression apparatus 1 can be made small.

As described above, it is possible to provide a small and inexpensive vibration suppression apparatus 1 having the performance required by the user.

(Other Embodiments)

This invention is not limited to the said Example, It can implement in other various forms, without deviating from the mind or main characteristic.

In the above embodiment, the upper plate 11, the lower plate 21, the spring unit 3, the vertical unit 5, the horizontal unit 7 and the control unit 9 to bolt together, so-called one-touch insertion type connection A structure may be adopted.

Further, in the above embodiment, an example in which the precision device 31 is damped and supported by using four or more vibration dampers 1 is not limited thereto, so long as the support structure is not unstable, that is, vibration damping. If the apparatus 1 is three or more, it becomes possible to damp-proof the precision instrument 31. As shown in FIG.

Further, in the above embodiment, the vertical unit 5, the horizontal unit 7 and the control unit 9 are connected by wiring, but the present invention is not limited thereto, and it is also possible to make the wireless.

Further, in the above embodiment, four units of the spring unit 3, the vertical unit 5, the horizontal unit 7 and the control unit 9 are arranged in two rows and two columns in plan, but are not limited thereto. Units may be combined, or depending on the number of units to be combined, for example, may be arranged in two rows and three columns in a plane.

Further, in the above embodiment, a manual leveling mechanism is employed, but the present invention is not limited to this, as long as it does not hinder the miniaturization and cost reduction. For example, an automatic level adjusting mechanism using a small electric motor or the like may be employed.

As such, the above-described embodiments are merely examples in all respects and should not be interpreted limitedly. In addition, all the deformation | transformation and a change which belong to the equal range of a claim are within the scope of this invention.

[Industry availability]

As described above, the present invention is useful for a vibration suppression apparatus and the like for damping and supporting a surface plate on which a device is mounted on a foundation.

1: Damping device 3: Spring unit (manual damping device)
5: vertical unit (first control force adding device)
7: horizontal unit (second control device)
9: control unit (control device) 11: top plate
13: coil spring 15: vertical acceleration sensor (first vibration sensor)
17: horizontal acceleration sensor (second vibration sensor)
21: bottom plate
25: vertical voice coil motor (first actuator)
27: horizontal voice coil motor (second actuator)
31: precision instrument (apparatus) 35: first housing (housing)
37: 2nd housing (housing) 41: Table
51: floor (foundation) 60: yoke (stator)
62: pole piece (stator) 64: magnet (stator)
68: coil (operator) 78: bobbin (operator)
80: diaphragm (rubber elastic body)

Claims (9)

A passive type for damping and supporting a device mounted on the base plate between the top plate supporting the base plate, the bottom plate mounted on the base plate, and the top plate and the bottom plate, and the device mounted on the base plate with respect to the base plate. In the vibration damper provided with a vibration damper,
A first vibration sensor for detecting vertical vibration of the device, a first control force adding device in which a first actuator for applying vertical control force to the device is modularized, and detecting horizontal vibration of the device The upper plate so that at least one of a second control force adding device and a second control device for modularizing a second actuator for applying a control force in the horizontal direction to the device are accommodated in the space between the upper plate and the lower plate Characterized in that it is configured to be detachably mounted
Vibration damper. The method of claim 1,
The first control force adding device includes a housing for accommodating the first vibration sensor in a state in which the axis thereof faces in a vertical direction, and for accommodating the first actuator under the first vibration sensor,
The first actuator has a stator fixed to the upper plate via the housing, a mover that reciprocates in a vertical direction with respect to the stator, and adds a control force in the vertical direction to the device by contacting the lower plate,
Characterized in that the stator and the mover are connected by a rubber elastic body
Vibration damper. The method of claim 1,
The second control force adding device includes a housing for accommodating the second vibration sensor in a state in which the axis thereof is in a horizontal direction, and for accommodating the second actuator under the second vibration sensor,
The second actuator has a stator fixed to the upper plate via the housing, and reciprocates in parallel with an axial direction of the second vibration sensor with respect to the stator, and is in contact with the passive vibration suppression device so as to be horizontal to the device. Has a mover that adds control of
Characterized in that the stator and the mover are connected by a rubber elastic body
Vibration damper. The method of claim 2,
The second control force adding device includes a housing for accommodating the second vibration sensor in a state in which the axis thereof is in a horizontal direction, and for accommodating the second actuator under the second vibration sensor,
The second actuator has a stator fixed to the upper plate via the housing, and reciprocates in parallel with an axial direction of the second vibration sensor with respect to the stator, and is in contact with the passive vibration suppression device so as to be horizontal to the device. Has a mover that adds control of
Characterized in that the stator and the mover are connected by a rubber elastic body
Vibration damper. The method of claim 1,
And a control device for controlling the control force adding device is detachable from the lower plate so as to be accommodated in the space between the upper plate and the lower plate.
Vibration damper. The method of claim 2,
And a control device for controlling the control force adding device is detachable from the lower plate so as to be accommodated in the space between the upper plate and the lower plate.
Vibration damper. The method of claim 3, wherein
And a control device for controlling the control force adding device is detachable from the lower plate so as to be accommodated in the space between the upper plate and the lower plate.
Vibration damper. The method of claim 4, wherein
And a control device for controlling the control force adding device is detachable from the lower plate so as to be accommodated in the space between the upper plate and the lower plate.
Vibration damper. The method according to any one of claims 5 to 8,
The passive vibration suppression device, the first and second control force adding device, and the control device are arranged in two rows and two columns in a plane between the upper plate and the lower plate.
Vibration damper.

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