JP2000227141A - Vibration proof mount and image pickup unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vibration-proof mount and an image pickup unit which comprises the vibration-proof mount and is provided with an adjusting function for restraining an image blurring due to rotation around an optical axis, by providing pressurization adjusting means for moving a plate in a direction urging to a side surface of an elastic member or a direction separating from the elastic member. SOLUTION: By bringing first and second plates 4 and 5 into contact with free surfaces 12 and 11 of a vulcanized rubber 1, respectively, a rate of free surface area of the vulcanized rubber 1 is decreased, apparent elastic modulus is increased, and spring rigidity of a vibration-proof mount becomes high as compared with a state in which the first plate 4 and the second plate 5 do not respectively come into contact with the free surfaces 12 and 11. Further, when set screws 6, 7 are loosened, contact surfaces between the first plate 4 and the vulcanized rubber 1 and between the second plate 5 and the vulcanized rubber 1 are reduced, areas of the free surfaces 11 and 12 are increased, and spring rigidity is decreased. The spring rigidity of the vibration proof mount can be adjusted, and frequency at a resonance point can be adjusted such that an effect exerted by a working environment of a device which is subjected to vibration isolation can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration mount for preventing vibration of electronic equipment mounted on an aircraft or a vehicle, and to an image pickup apparatus having the anti-vibration mount.

[0002]

2. Description of the Related Art In an image pickup apparatus mounted on a base such as an aircraft or a vehicle, severe vibrations and shocks are applied to an operating environment, and in some cases, there is a possibility that the image pickup apparatus may be damaged. If the imaging device has a structure that can withstand such severe vibrations and shocks, the entire device becomes large and may not be suitable for mounting. For this reason, the imaging device, which is a vibration-isolated device, is supported by an anti-vibration mount to absorb vibration and shock applied to the imaging device,
A system in which vibration and impact are not directly applied to an electronic device and an optical system inside the imaging device is used.

FIG. 4 shows a conventional image pickup apparatus. An optical system 29 is mounted on a first frame 30 and includes a lens,
The imaging device has an imaging device, forms light incident on the imaging device via a lens, and outputs an obtained image as an imaging signal from a cable (not shown). The first sensor 51 is attached to the first frame 30, detects the acceleration in the translation direction, and outputs it as a signal. The second sensor 52 is the first frame 3
0, which detects the angular velocity or angular acceleration around the optical axis of the optical system 29, converts it into a voltage, and outputs it. The first frame 30 is supported by the second frame 31 via a first bearing 36 and a second bearing 37 attached to a first shaft 32 and a second shaft 33. The first frame 30 is driven to rotate relative to the second frame 31 by the first direct drive motor 40. Further, the rotation angle is detected by the first resolver 42.

In the figure, a second frame 31 is supported by a fixed frame 44 by a third bearing 38 and a fourth bearing 39 attached to a third shaft 34 and a fourth shaft 35, respectively. By the direct motor 43,
It is driven relatively to the fixed frame 44. The fixed frame 44 is connected to flanges (not shown) of the first anti-vibration mount 45 and the second anti-vibration mount 46 by screws. First anti-vibration mount 45 and second anti-vibration mount 4
6 is connected to a flange (not shown) provided on a holder 49 fixed to the structural frame 47 by screws.
The respective frames are relatively driven to rotate, so that the optical system can capture an image in an arbitrary direction.

FIG. 5 shows first and second anti-vibration mounts 45 and 4.
6 is a configuration diagram of FIG. The vulcanized rubber 48 is a metal holder 49
And the flange 50.

In the anti-vibration mount configured as described above, when vibration or impact is applied to the structural frame 47 provided on an aircraft or a vehicle, the first anti-vibration mount 4
5. Energy is absorbed by the second anti-vibration mount 46. As a result, vibrations applied to the second frame 31, the first frame 30, and the optical system 29 from the structural frame 47 supported by each anti-vibration mount via the third and fourth bearings 38 and 39, respectively. The impact is attenuated to prevent failure or breakage of each device, and it is possible to reduce the weight of each frame, optical system, and the like supported by the anti-vibration mount.

[0007]

However, in such an image pickup apparatus, the spring stiffness of the anti-vibration mount varies widely, and after being molded from vulcanized rubber, the adjustment of the spring stiffness of the anti-vibration mount is not possible. It is possible. For this reason, the resonance point of the anti-vibration support system cannot be accurately specified, and depending on the environment in which the anti-vibration support system is used, resonance occurs in the anti-vibration mount, and there is a problem that an image of the imaging apparatus is blurred.

Also, if there is a variation in the spring stiffness of the anti-vibration mounts that support the frame, the displacement of each of the anti-vibration mounts will vary even if vibrations of the same amplitude and the same phase are input in the translation direction. , Resulting in different vibrations with the phase. The frame supported at both ends by the anti-vibration mount is displaced by vibrations of different amplitudes and phases at the respective support points, and the displacement at the center of the frame is coupled vibration in the translation direction and the rotation direction. The generation of the vibration component in the rotation direction causes the optical system mounted on the frame to rotate and touch around the optical axis.However, in the configuration of the conventional imaging device, since there is no rotation drive mechanism around the optical axis, There is a problem that it is impossible to correct the rotation component and image blur occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems in an image pickup apparatus having an anti-vibration mount.
It is another object of the present invention to provide an image pickup apparatus having an anti-shake mount and an adjustment function for suppressing image blur due to rotation about the optical axis.

[0010]

According to a first aspect of the present invention, there is provided an anti-vibration mount which is joined to a flange having first joining means for joining an anti-vibration device and a base on which the anti-vibration device is mounted. A holder having a second joining means for, and an elastic member abutting so as to be sandwiched between the holder and the flange,
A plate capable of abutting on a side surface of the elastic member deviating from a contact surface between the flange and the holder, and a direction for urging the plate toward the side surface of the elastic member or a direction for separating the plate from the elastic member And pressure adjusting means for moving the pressure.

In a vibration-proof mount according to a second aspect of the present invention, in the first aspect, the pressure adjusting means is provided on a protruding edge protruding from the holder, and extends in a direction facing a side surface of the elastic member. It comprises a coil spring that is extendably attached, a plurality of plates attached to the coil spring, and a set screw that is engaged with the holder and whose tip abuts on the plate. By tightening the set screw, 2. The anti-vibration mount according to claim 1, wherein the anti-vibration mount has a function of adjusting a spring rigidity.

According to a third aspect of the present invention, there is provided an anti-vibration mount including a flange having first joining means for joining an anti-vibration device, and a second joining to join a base on which the anti-vibration device is mounted. A holder having means, a rectangular parallelepiped elastic member abutting between the flange and the holder, a plate capable of abutting on a side surface of the elastic member deviating from a contact surface between the flange and the holder, A plurality of piezoelectric elements held at the protruding edge of the holder near the side surface of the vulcanized rubber, wherein each of the piezoelectric elements urges the plate toward the side surface of the elastic member according to an applied current. Alternatively, it has means capable of expanding and contracting in a direction to separate the ring from the elastic member.

An imaging apparatus according to a fourth aspect of the present invention includes an imaging device supported by the anti-vibration mount according to any one of claims 1 to 3.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of an anti-vibration mount according to Embodiment 1 of the present invention. FIG.
In (a), the anti-vibration mount is a rectangular or annular vulcanized rubber 1, a metal holder 2 and a flange 3,
It comprises a first plate 4, a second plate 5, set screws 6 and 7, a coil spring 8 and a coil spring 9. Each set screw is arranged at equal intervals on the front and back of the holder 2. The holder 2 has a protruding edge portion 10 protruding in the vicinity of the end face of the vulcanized rubber so as to face the vulcanized rubber, and set screws 6 and 7 are fitted into the protruding edge portion 10. Further, the first and second plates 4 and 5 have a rectangular plate or a curved plate shape so as to contact the side surface of the vulcanized rubber 1.

When the setscrews 6 and 7 are not tightened in FIG. 1A, the first plate 4 and the second plate 5 are attracted to the holder 2 by the coil springs 8 and 9. , Free surface 1 of vulcanized rubber 1
0 and 11 are kept out of contact. FIG. 1B shows a state where the set screws 6 and 7 are tightened. FIG. 1 (b)
The first plate 4 and the second plate 5 are held in contact with the free surfaces 11 and 12 of the vulcanized rubber 1 when the set screw is tightened.

In general, as a characteristic of rubber, the smaller the ratio of the free surface area to the area receiving a load, the larger the apparent elastic modulus of the rubber is. The first plate 4 and the second plate 5 are free surfaces 11 of the vulcanized rubber 1.
And 12, the ratio of the free surface area of the vulcanized rubber 1 is reduced, the apparent elastic modulus is increased, and the spring stiffness of the anti-vibration mount is such that the first plate 4 and the second plate 5 are in contact with each other. It will be higher than the state without.
Also, when the setscrews 6 and 7 are loosened, the first plate 4
, The contact area between the second plate 5 and the vulcanized rubber 1 decreases, the areas of the free surfaces 11 and 12 increase, and the spring stiffness decreases.

The image pickup apparatus is supported in the same manner as in the prior art by using two or more anti-vibration mounts in this embodiment, and a sine wave vibration whose frequency continuously changes is applied to the structural frame 47 in FIG. By adjusting the tightening amounts of the setscrews 6 and 7 while observing the acceleration signal of the sensor 51, the contact area of the free surface of the vulcanized rubber 1 is changed, and after molding, the spring rigidity of the anti-vibration mount is adjusted. The frequency at the resonance point is adjusted so that the influence from the usage environment of the imaging device is reduced. Also, while observing the output signal at the resonance frequency of the second sensor 52, the output level is reduced,
By changing the amount of tightening of the setscrew 6 and 7 and finely adjusting the spring stiffness of the anti-vibration mount to be equal, rotation around the optical axis of the imaging device caused by the amplitude and phase difference of the response vibration of the anti-vibration mount. Suppress motion and reduce image blur. The anti-vibration mount may be, for example, a radar such as a millimeter-wave imaging device having angular measurement accuracy, in addition to the imaging device.

Embodiment 2 FIG. FIG. 2 is a configuration diagram of an anti-vibration mount according to a second embodiment of the present invention. In FIG. 2A, the anti-vibration mount includes a vulcanized rubber 13, a metal holder 14 and a flange 15, a first plate 16, a second plate 17, set screws 18 and 19, a coil spring 20 and a coil spring 21. It is composed of The set screws are arranged at equal intervals on the front and back of the holder 14, respectively. The holder 14 has a protruding edge portion 22 protruding in the vicinity of the end face of the vulcanized rubber so as to face the vulcanized rubber, and the protruding edge portion 22 is fitted with set screws 18 and 19.

In the case where the setscrew 18 and the set screw 19 are not tightened in FIG.
And the second plate 17 is attracted to the holder 14 by the coil springs 20 and 21 and the vulcanized rubber 1
3 is kept out of contact with the free surfaces 23, 24. FIG. 2B shows a state where the setscrews 6 and 7 are tightened. In FIG. 2B, when the set screw is tightened, the first plate 16 and the second plate 17 are held in contact with the free surfaces 23 and 24 of the vulcanized rubber 13.

In general, as a characteristic of rubber, the smaller the ratio of the free surface area to the area receiving the load, the larger the apparent elastic modulus of the rubber is. When the first plate 16 and the second plate 17 come into contact with the free surfaces 23 and 24 of the vulcanized rubber 13, the ratio of the free surface area of the vulcanized rubber 13 is reduced, and the apparent elastic modulus is increased. The spring rigidity of the swing mount is higher than the state where the first plate 16 and the second plate 17 are not in contact with each other. When the set screws 18 and 19 are loosened, the first plate 16, the second plate 17, and the vulcanized rubber 13 are removed.
, The area of the free surfaces 23 and 24 increases, and the spring stiffness decreases.

The anti-vibration mount according to the present embodiment is used for an image pickup apparatus similar to the conventional one, and the structure frame 4 shown in FIG.
7, a sine wave vibration whose frequency continuously changes is applied, and the set screws 18 and
By adjusting the tightening amount of 19 and the number of plates to be tightened, the contact area of the free surface of the vulcanized rubber 1 is changed, the spring stiffness of the vibration isolating mount is adjusted after molding, and the The frequency at the resonance point is adjusted so as to reduce the influence. Further, while observing the output signal at the resonance frequency of the second sensor 52, the amount of tightening of the set screws 18 and 19 and the number of plates to be tightened are changed so that the output level becomes small, and the spring rigidity of the anti-vibration mount is reduced. By making fine adjustments so as to make them equal, the rotational movement of the image pickup apparatus around the optical axis caused by the amplitude and phase difference of the response vibration of the image stabilizing mount is suppressed, and image blurring is reduced.

Embodiment 3 FIG. FIG. 3 is a configuration diagram of an anti-vibration mount according to a third embodiment of the present invention. In FIG. 3A, the anti-vibration mount is a vulcanized rubber 1, a metal holder 2
And a flange 3, a first plate 4, a second plate 5, and piezoelectric elements 25 and 26. Each of the piezoelectric elements 25 and 26 is bonded to the holder 2, the first plate 4, and the second plate 5. The holder 2 has a protruding edge portion 10 protruding near the end face of the vulcanized rubber so as to face the vulcanized rubber, and the piezoelectric elements 25 and 26 are bonded to the protruding edge portion 10.

FIG. 3B is an enlarged view of a rubber portion of the anti-vibration mount. In FIG. 3A, the piezoelectric elements 25, 26
When no voltage is applied to the first and second rubber plates, the first plate 4 and the second plate 5 are kept out of contact with the rubber free surfaces 27 and 28. FIG. 3B shows a state where a voltage is applied to the piezoelectric elements 25 and 26. When a voltage is applied to the piezoelectric elements 25 and 26 in FIG.
The second plate 5 comprises free surfaces 27 and 28 of the vulcanized rubber 1.
It is held in contact with.

When the first plate 4 and the second plate 5 come into contact with the free surfaces 27 and 28 of the vulcanized rubber 1, the ratio of the free surface area of the vulcanized rubber 1 decreases, and the apparent elastic modulus increases. That is, the spring rigidity of the anti-vibration mount is higher than the state where the first plate 4 and the second plate 5 are not in contact with each other. When the application of the voltage to the piezoelectric elements 12 and 13 is stopped, the first plate 4 and the second plate 5 move to the holder 2 side, the contact area of the vulcanized rubber 1 decreases, and the free surfaces 27 and 28 The area of
Spring stiffness is reduced.

The anti-vibration mount according to the present embodiment is used for an image pickup device similar to the conventional one, and the structure frame 4 shown in FIG.
7, a sine wave vibration having a continuously changing frequency is applied to the piezoelectric element 25, while observing the acceleration signal of the first sensor 51.
By adjusting the applied voltage to 26, the contact area of the free surface of the vulcanized rubber 1 is changed, the spring stiffness of the anti-vibration mount is adjusted after molding, and the influence from the use environment of the imaging device is reduced. Adjust the frequency of the resonance point. Further, while observing the output signal at the resonance frequency of the second sensor 52, the piezoelectric elements 25 and 2 are controlled so that the output level is reduced.
By changing the applied voltage to 6 and finely adjusting the spring stiffness of the anti-vibration mount to be equal, the rotational movement of the image pickup apparatus around the optical axis caused by the amplitude and phase difference of the response vibration of the anti-vibration mount is suppressed. To reduce image blur.

[0026]

Since the present invention is configured as described above, it has the following effects.

According to the first and fourth aspects of the invention, in a vibration-proof device such as an imaging device radar, a vibration-proof mount having a plate which is held in contact with a free surface of an elastic body such as rubber by a pressure adjusting means is provided. By using this, it is possible to adjust the spring stiffness of the anti-vibration mount after molding, and it is possible to adjust the frequency of the resonance point so as to reduce the influence of the use environment of the anti-vibration device.

According to the second and fourth aspects of the present invention, in a vibration-proof device such as an imaging device, a vibration-proof mount having a plate which is held in contact with a free surface of an elastic body such as rubber by a push screw is used. Further, the spring rigidity of the anti-vibration mount can be adjusted more accurately and easily after molding, and the frequency of the resonance point can be adjusted so as to be less affected by the use environment of the anti-vibration device.

According to the third and fourth aspects of the present invention, in a vibration-proof device such as an imaging device, a vibration-proof mount having a plate which is held in contact with a free surface of an elastic body such as rubber by a piezoelectric element is used. Further, the spring rigidity of the anti-vibration mount can be easily adjusted after molding, and there is an effect that the frequency of the resonance point can be adjusted so as to be less affected by the use environment of the anti-vibration device.

[Brief description of the drawings]

FIG. 1 is a diagram showing an anti-vibration mount according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an anti-vibration mount according to a second embodiment of the present invention.

FIG. 3 is a diagram showing an anti-vibration mount according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an imaging device having an anti-vibration mount.

FIG. 5 is a configuration diagram of a conventional anti-vibration mount.

[Explanation of symbols]

1 vulcanized rubber, 2 holder, 3 flange, 4 first plate, 5 second plate, 6 first set screw,
7 second set screw, 8 first coil spring, 9 second coil spring, 10 ridge, 11 first free surface,
12 second free surface, 13 vulcanized rubber, 14 holder, 15 flange, 16 first plate, 17 second plate, 18 set screw, 19 set screw, 20
First coil spring, 21 Second coil spring, 22
Protrusion, 23 free surface, 24 free surface, 25 piezoelectric element, 26 piezoelectric element, 27 free surface, 28 free surface, 29 optics, 30 first frame, 31 second frame, 32 first shaft, 33 second shaft, 34 third shaft, 35 fourth shaft,
36 first bearing, 37 second bearing, 38 third bearing, 39 fourth bearing, 40 first direct motor, 41 second direct motor, 42 first resolver, 43 second resolver, 44 Fixed frame, 4
5 first anti-vibration mount, 46 second anti-vibration mount,
47 structural frame, 48 vulcanized rubber, 49 holder,
50 Flange, 51 First sensor, 52 Second sensor.

Claims (4)

[Claims] A flange having first joining means for joining the vibration-proof device; a holder having second joining means for bonding to the base on which the vibration-proof device is mounted; and the flange. An elastic member that comes into contact with the holder, a plate that can come into contact with a side surface of the elastic member that departs from the contact surface between the flange and the holder, and biases the plate toward the side surface of the elastic member. And a pressure adjusting means for moving the plate in a direction to move the plate away from the elastic member. 2. A coil spring, which is provided on a protruding edge portion of the holder and protruded from the holder, and is attached to the elastic member so as to extend and contract in a direction facing a side surface of the elastic member. It consisted of a plurality of attached plates and a set screw engaged with the holder and having a tip abutting on the plate, and had a function of adjusting the spring rigidity by tightening the set screw. The anti-vibration mount according to claim 1, wherein: 3. A holder having first joining means for joining the vibration-isolated device, a holder having second joining means for joining to the base on which the vibration-isolated device is mounted, and the flange. A rectangular parallelepiped elastic member that is in contact with the holder, a plate that can abut on a side surface of the elastic member that departs from the contact surface between the flange and the holder, and the holder near the side surface of the elastic member. And a plurality of piezoelectric elements held at the protruding edge portion, wherein each of the piezoelectric elements,
An anti-vibration mount comprising: means for urging the plate toward a side surface of the elastic member or expanding and contracting the plate in a direction to separate the plate from the elastic member in response to an applied current. 4. An image pickup apparatus comprising an image pickup device supported by the anti-vibration mount according to claim 1.