KR20110050240A - Tilt mirror mechanism, ir detecting system having the same and control method of tilt mirror mechanism - Google Patents

Abstract

PURPOSE: A mirror driving device, an infrared-rays detecting system therewith, and a control method thereof are provided to cut off the power of a drive motor when the mirror driving device is abnormally operated. CONSTITUTION: A mirror driving device comprises a mirror(210), a drive motor, a magnet(230), and an electromagnet unit(240). The mirror is installed in one end of a support frame(201). The rotary shaft of the drive motor is connected to the other end of the support frame. The drive motor moves the mirror from a first position to a second position separated from the first position. The magnet applies first magnetic force to a part of the support frame so that the mirror can be fixed to the second position. The electromagnet unit generates second magnetic force for reducing the first magnetic force so that the mirror can be returned to the first position.

Description

A mirror drive device, a calibrated infrared detection system having the same, and a control method of a mirror drive device {TILT MIRROR MECHANISM, IR DETECTING SYSTEM HAVING THE SAME AND CONTROL METHOD OF TILT MIRROR MECHANISM}

The present invention relates to a mirror drive device for controlling the position of a mirror, a calibrated infrared detection system having the same, and a control method of the mirror drive device.

IR detectors mounted on satellites or the like should be calibrated on track. In general, the infrared radiation emitted from the black body is incident to the detector, and based on this, the infrared detector is calibrated.

The mirror driving device used to implement the calibration method is to place the mirror on the optical path between the black body and the infrared detector in the deployed state, and to position the mirror to be off the optical path in the stowed state. To control.

In the mirror driving apparatus, the holding torque of the step motor is used as a method of maintaining the deployed state after the mirror deployment, but this has the disadvantage of requiring a separate thermal control system design because power consumption is increased and heat generation is increased during long time operation.

Therefore, an apparatus and method for more efficiently maintaining the deployment state after mirror deployment can be considered.

An object of the present invention is to provide a mirror drive device of a different type from the conventional.

Another object of the present invention is to provide a mirror driving device driven with lower power consumption, a calibrated infrared detection system having the same, and a control method of the mirror driving device.

In order to achieve the above object of the present invention, a mirror driving apparatus according to an embodiment of the present invention, the mirror is mounted on one end of the support frame, the rotating shaft is connected to the other end of the support frame and the mirror is spaced apart from each other A drive motor for rotating the rotating shaft to move from a first position to a second position, a magnet for applying magnetic force to at least a portion of the support frame to fix the mirror at the second position, and the mirror is in the first position It includes an electromagnet portion for generating a magnetic force in the direction to cancel the magnetic force to be restored to.

According to an example related to the present invention, the electromagnet portion includes a magnetic material and a coil. The magnetic body is equipped with a magnet so that the magnetic body is magnetized. The magnetic body is spaced apart from the support frame at the first position and is disposed adjacent to at least a portion of the support frame when the mirror moves to the second position. The coil wraps the magnetic material to generate the magnetic force in a direction to cancel the magnetic force of the magnet when a current is applied.

According to another example related to the present invention, the support frame is equipped with a metal member that is attracted by the magnetic force. The magnetic body includes a magnet mounting portion, an extension portion and a magnetization portion. A magnet is mounted to the magnet mounting portion, and a coil is disposed on the extension portion. The extension portions are respectively extended at both ends of the magnet mounting portion, and the magnetization portion is formed at the end portion of the extension portion and magnetized by the magnet, and is arranged to contact the metal member at the second position.

According to another example related to the present invention, the mirror driving device includes at least one of a pivot spring, a controller, and a limit switch. One end of the pivot spring is connected to the rotating shaft, and the other end is mounted to a support that supports the rotating shaft. The pivot spring is formed to exert an elastic force on the axis of rotation in a direction in which the mirror is restored from the second position to the first position. The control unit is configured to block power supply of the driving motor while the mirror is moved from the first position to the second position. The limit switch is formed to be pressed by the support frame to generate an electrical signal when the mirror is placed in the first or second position.

In addition, a calibrated infrared detection system according to another embodiment of the present invention includes an infrared detector mounted on a satellite and configured to detect incident infrared light, and a mirror, wherein the mirror is configured to detect an incident path of the infrared light at a first position. And the mirror driving device arranged to deviate and moved so that the mirror is disposed on an incident path of the infrared light in a second position, and wherein the mirror reflects infrared light emitted from a black body to the infrared detector at the second position. do.

In addition, the present invention discloses a control method of a mirror drive device in order to realize the above object. A control method of a mirror driving apparatus may include supplying power to a driving motor to move a mirror connected to a rotation axis of the driving motor to a second position disposed on the incident path from a first position away from an incident path of an infrared detector; Stopping power supply to the driving motor and maintaining the position of the mirror at the second position by using a magnetic force of a magnet, and restoring the mirror from the second position to the first position by using an electromagnet; Generating a magnetic force in a direction to cancel the magnetic force of the magnet.

According to another example related to the present invention, a control method of a mirror driving apparatus includes applying an elastic force to a rotation axis in a direction in which the mirror is restored from the second position to the first position.

The mirror drive device, the calibrated infrared ray detection system having the same, and the control method of the mirror drive device according to the present invention configured as described above maintain the deployed state of the mirror without power consumption of the drive motor through the magnet and the electromagnet portion. In addition, through this, the amount of heat is reduced, and implements a mirror driving device that does not require a separate heat control device.

In addition, the present invention, through the control unit, the power supply of the drive motor is cut off when the mirror driving device malfunctions, cancels the magnetic force of the electromagnet portion and at the same time automatically restores the mirror to the stored state through the restoring force of the pivot spring.

Hereinafter, a mirror driving apparatus according to the present invention, a calibrated infrared detection system having the same, and a control method of the mirror driving apparatus will be described in more detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural forms unless the context clearly indicates otherwise.

1 is a conceptual diagram illustrating a calibrated infrared detection system 100 in accordance with an embodiment of the present invention.

The infrared detection system 100 includes an infrared detector (IR) detector 110 and a mirror driving device 200.

The infrared detector 110 is formed to detect incident infrared light. The infrared detector may be a photodetector (photo sensor) that responds to infrared radiation and is arranged to receive infrared light from the incident path 101.

The infrared detector 110 may be mounted on a satellite positioned on an orbit and is formed to detect infrared rays emitted from a target to acquire an image. The infrared detector 110 is disposed to face the target to acquire an image, and the incident path 101 may be a path of infrared rays incident from the target.

The mirror driving device 200 includes a mirror 210 configured to reflect infrared light emitted from a black body to the infrared detector 110.

The mirror 210 is disposed to deviate from the incidence path 101 of the infrared rays at the first position and is moved to be disposed on the incidence path 101 of the infrared rays at the second position. That is, the mirror 210 is disposed to reflect the infrared rays emitted from the black body to the infrared detector 110 at the second position.

Hereinafter, the first position referred to means the position of the mirror 210 when the mirror 210 is stowed in the mirror driving apparatus, and the second position is the deployment of the mirror 210 in the mirror driving apparatus. It means the position of the mirror 210 when deployed. The first and second positions may be positions spaced apart from each other on the circumference.

The infrared detector 110 calculates accurate temperature information of the black body by using infrared rays of the black body reflected by the mirror 210, and uses the same to calibrate the infrared detector 110.

Referring to this figure, the infrared detection system 100 may include a control unit 120. The control unit 120 receives a control signal from the ground station, controls the operation of the mirror driving apparatus 200, or detects an operation state of the mirror driving apparatus 200 and transmits a detection signal to the ground station.

Hereinafter, a mirror driving apparatus 200 that may be applied to the infrared detection system 100 will be described with reference to FIGS. 2 to 5B. FIG. 2 is an exploded view of the mirror driving device 200 shown in FIG. 1, FIG. 3 is an enlarged view of a portion A of FIG. 2, and FIGS. 4A to 5B are operations of the mirror driving device 200 of FIG. 2, respectively. It is degrees.

2 and 3, the mirror driving apparatus 200 includes a mirror 210, a driving motor 220, a magnet 230, and an electromagnet unit 240.

The mirror 210 is mounted at one end of the support frame 201.

The support frame 201 is formed in the form of a cantilever beam extending in one direction, and is coupled to the mirror 210 at a free end through, for example, bonding. At the free end of the supporting frame 201, a mirror mounting portion 201a may be formed to protrude in a direction crossing the extending direction of the supporting frame 201. Specifically, the mirror 210 is mounted to the mirror mounting portion 201a to cover the front surface of the mirror mounting portion 201a.

The driving motor 220 may be a step motor, and the rotation shaft 221 is connected to the other end of the support frame 201. That is, the other end of the support frame 201 becomes a fixed end of the cantilever beam formed by the support frame 201, which is rotated about the rotation shaft 221 by the driving of the driving motor 220. Specifically, the driving motor 220 rotates the rotating shaft 221 to move the mirror 210 from the first position spaced apart from the second position.

The magnet 230 is formed to apply a magnetic force to at least a portion of the support frame 201 so that the mirror 210 is fixed in the second position, the electromagnet portion 240 is a magnet so that the mirror 210 is restored to the first position It is made to generate a magnetic force in the direction to cancel the magnetic force of (230). The magnet 230 may be a permanent magnet.

The electromagnet unit 240 includes a magnetic body 241 and a coil 242.

The magnetic body 241 is coupled to the magnet 230 to be magnetized, spaced apart from the support frame 201 at the first position, and adjacent to at least a portion of the support frame 201 when the mirror 210 moves to the second position. Is placed.

The coil 242 is formed to surround the magnetic body 241 to generate a magnetic force in a direction to cancel the magnetic force of the magnet 230 when a current is applied.

Referring to FIG. 2, the support frame 201 is equipped with a metal member 250 that is attracted by magnetic force. The metal member 250 is made of a material attached to the magnet, and when the mirror 210 moves to the second position, the metal member 250 is disposed on the rear surface of the mirror mounting portion 201a so as to be adjacent to the magnetic material 241, for example, by bonding or bolting. Is fastened.

The magnetic body 241 is mounted to the magnetic fastening part 203 protruding from the base frame 202a which can be connected to the floor. The support frame 201 is rotatably connected to another base frame 202b disposed adjacent to the base frame, and a driving motor 220 is mounted.

A plurality of supports 204a and 204b are disposed in the base frame 202. Specifically, the base frame 202 is rotatably connected to one of the supports (204a, 204b), the base frame 202 and the rotating shaft 221 is rotatably connected to the other (204b) do.

The magnetic body 241 includes a magnet mounting portion 241a, an extension portion 241b and a magnetization portion 241c.

The magnet 230 is mounted to the magnet mounting portion 241a, and the magnet mounting portion 241a is formed to be parallel to the magnet 230.

The extension part 241b extends in the direction crossing the magnet 230 at both ends of the magnet mounting part 241a, respectively. In the extension part 241b, the coils 242 surround the two extension parts 241b facing each other.

The magnetization part 241c is formed at the end of the extension part 241b to be magnetized by the magnet 230, and is disposed to contact the metal member 250 when the mirror 210 moves to the second position.

Limit switches 261 and 262 are disposed on the rotation path of the support frame 201. The limit switches 261 and 262 are configured to be pressed by the support frame 201 to generate an electric signal when the mirror 210 is placed in the first or second position.

2 and 3, a pivot spring 270 is mounted on the supports 204a and 204b of the support frame 201.

The pivot spring 270 is configured to be rotatable with respect to the stationary body, and is configured to apply a restoring force in a direction to return the angle changed by the rotation to its original position.

One end of the pivot spring 270 is connected to the rotation shaft 221, and the other end is mounted to the supports 204a and 204b supporting the rotation shaft 221. That is, the fixed body is mounted to the support (204a, 204b), the movement body is connected to the rotary shaft 221 or the support frame 201. When the pivot spring 270 rotates in the direction in which the rotation shaft 221 moves the mirror 210 to the second position, the pivot spring 270 restores the mirror 210 to the first position on the rotation shaft 221 or the support frame 201. The elastic force is applied in the direction. In addition, an initial elastic force may be added to the pivot spring 270 such that the mirror 210 faces the first position.

4A and 4B are perspective and side views of the mirror driving apparatus 200 when the mirror 210 is disposed at the first position, respectively. 4A and 4B, the torsion (or initial torsion) acts on the pivot spring 270 in the direction in which the first limit switch 261 is pressed, and the mirror 210 is positioned at the first position.

5A and 5B are respectively a perspective view and a side view of the mirror driving device 200 when the mirror 210 is disposed in the second position.

5A and 5B, the control unit 120 (see FIG. 1) receiving the control command transmitted from the ground station drives the driving motor 220. In detail, the driving motor 220 is supplied with power for driving. The support frame 201 is rotated by the rotation of the rotation shaft 221, and the mirror 210 is moved to the second position. When the mirror 210 is disposed in the second position, the magnetization portion 241c of the magnetic body 241 magnetized by the magnet 230 exerts an attractive force on the metal member 250, and thereby the position of the mirror 210. Is fixed.

At this time, the switch 262a of the second limit switch 262 is pressed by the supporting frame 201, and the control unit 120 (see FIG. 1) is switched by the mirror of the second limit switch 262. Generates a signal indicating that is located at the second position. The signal can be transmitted to the ground station, whereby the user can know that the mirror 210 is placed in the second position. In addition, when the second limit switch 262 is switched, the controller stops supplying power to the driving motor 220. Through this, the power consumption and heat generation amount of the driving motor 220 can be reduced.

The controller 120 is configured to cut off the power supply of the driving motor 220 while the mirror 210 is moved from the first position to the second position. If the mirror 210 fails to move to the second position, the control unit 120 cuts off the power supply and causes the mirror 210 to return to the first position due to the torsion applied to the pivot spring 270. do.

Referring again to FIGS. 4A and 4B, to restore the mirror 210 to the first position, a current is supplied to the coil 242. Through this, the magnetic field formed in the electromagnet portion 240 cancels the magnetic field formed by the magnet 230 to release the restraint of the mirror, and to the restoring force of the pivot spring 270 simultaneously serving as a bearing and a torsion spring. As a result, the mirror 210 returns to the first position.

At this time, the switch 261a of the first limit switch 261 is pressed by the support frame 201, and the control unit 120 (see FIG. 1) is switched by the mirror of the first limit switch 261. Generates a signal indicating that is at the first position. This allows the user to know that the mirror 210 is disposed at the first position.

Hereinafter, a method of controlling the mirror driving apparatus 200 will be described with reference to FIG. 6. 6 is a flowchart illustrating a control method of a mirror driving apparatus according to another exemplary embodiment of the present invention.

In the control method of the mirror driving apparatus, first, power is supplied to the driving motor to move the mirror connected to the rotation axis of the driving motor to a second position disposed on the incident path from a first position away from the incident path of the infrared detector (S100). ). For example, as one end is mounted on the other end of the support frame connected to the rotation shaft of the drive motor, and the rotation shaft is rotated, the mirror may be moved from the first position to the second position.

Next, an elastic force is applied to the rotating shaft in a direction in which the mirror is restored from the second position to the first position (S200). That is, when the rotating shaft rotates so that the mirror moves from the first position to the second position, an elastic force is applied in the direction opposite to the rotating direction of the rotating shaft.

For example, the pivoting body of the pivot spring is mounted on the rotational shaft or the support frame so as to torsion the support frame or the rotational shaft in a direction opposite to the rotational direction of the rotational shaft, and the fixed body is mounted on the support or the like.

Next, the power supply to the driving motor is stopped and the position of the mirror is maintained at the second position by using the magnetic force of the magnet (S300). For example, the magnet is arranged to be in contact with at least a portion of the support frame in the second position.

Finally, the magnetic force is generated in a direction to cancel the magnetic force of the magnet so that the mirror is restored from the second position to the first position by using the electromagnet (S400). When the magnetic force of the magnet is canceled by the electromagnet, the force restraining the mirror in the second position is removed, so that the mirror is restored to the first position by the elastic force of the pivot spring applied in the opposite direction of rotation.

Such a mirror driving apparatus, a calibrated infrared detection system having the same, and a method of controlling the mirror driving apparatus are not limited to the configuration and method of the above-described embodiments, and the embodiments may be modified so that various modifications can be made. All or part of the examples may be optionally combined.

1 is a conceptual diagram illustrating a calibrated infrared detection system according to an embodiment of the present invention.

FIG. 2 is an exploded view of the mirror driving device shown in FIG. 1. FIG.

3 is an enlarged view of a portion A of FIG. 2.

4A and 4B are a perspective view and a side view, respectively, of the mirror driving apparatus when the mirror is disposed in the first position;

5A and 5B are a perspective view and a side view, respectively, of the mirror drive device when the mirror is disposed in the second position;

6 is a flowchart illustrating a control method of a mirror driving apparatus according to another embodiment of the present invention.

Claims (9)

A mirror mounted to one end of the support frame; A drive motor having a rotation shaft connected to the other end of the support frame and rotating the rotation shaft to move the mirror from a first position spaced apart to a second position; A magnet that applies magnetic force to at least a portion of the support frame to fix the mirror in the second position; And And an electromagnet portion generating magnetic force in a direction to cancel the magnetic force so that the mirror is restored to the first position. The method of claim 1, The electromagnet portion, A magnetic body mounted to be magnetized to be magnetized, spaced apart from the support frame at the first position, and disposed to be adjacent to at least a portion of the support frame when the mirror moves to the second position; And And a coil surrounding the magnetic material to generate a magnetic force in a direction to cancel the magnetic force of the magnet when a current is applied. The method of claim 2, The support frame is equipped with a metal member that is attracted by the magnetic force, The magnetic material, A magnet mounting unit on which the magnet is mounted; An extension part in which the coil is disposed and extending from both ends of the magnet mounting part; And And a magnetization part formed at an end of the extension part and magnetized by the magnet and disposed to contact the metal member at the second position. The method of claim 1, One end is connected to the rotating shaft, the other end is mounted to a support for supporting the rotating shaft, the mirror further comprises a pivot spring for applying an elastic force in the direction in which the mirror is restored from the second position to the first position Drive system. The method of claim 1, And a power supply control unit configured to block power supply of the driving motor while the mirror is moved from the first position to the second position. The method of claim 1, And a limit switch pressurized by the support frame to generate an electrical signal when the mirror is disposed in the first or second position. An infrared detector mounted on a satellite and configured to detect incident infrared light; And A mirror, wherein the mirror is disposed to deviate from the incidence path of the infrared rays at a first position, the mirror is moved to be disposed on the incidence path of the infrared rays at a second position, and the mirror is positioned at the second position. 7. A calibrated infrared detection system comprising a mirror drive according to any one of claims 1 to 6, adapted to reflect infrared radiation emitted from a black body to the infrared detector. Supplying power to a driving motor to move a mirror connected to the rotational axis of the driving motor from a first position away from an incident path of an infrared detector to a second position disposed on the incident path; Stopping power supply to the driving motor and maintaining the position of the mirror at the second position by using a magnetic force of a magnet; And And generating a magnetic force in a direction to cancel the magnetic force of the magnet such that the mirror is restored from the second position to the first position by using an electromagnet. The method of claim 8, And applying an elastic force to the rotating shaft in a direction in which the mirror is restored from the second position to the first position.

Images