JPH085455A - Infrared detector scanner - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a scanner of an infrared detection device in which the occurrence of image distortion is suppressed and the scanning blank time is short. [Structure] Scanner mirror 5 with shaft 12 as axis of rotation
The motor 11 for rotating the shaft at a predetermined scanning angle, and the shaft
12 attached angle detectors 15, a bar 40 made of a magnetic material whose central portion is axially attached to the shaft 12 so as to follow the scanner mirror 5 and make a rotational movement, and the bars 40 separated by a scanning angle. The configuration is provided with a plurality of electromagnets 50A and 50B installed so as to face the ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner for an infrared detecting device. As shown in FIG. 10, the infrared detecting elements 2 used in the infrared detecting device are formed on the surface of the substrate 1 made of sapphire or the like at an equal pitch in the longitudinal direction (V direction shown in FIG. 10).

Each infrared detecting element 2 is composed of a light receiving portion formed of a square piece (each side is 50 μm to 100 μm, thickness is about 10 μm) such as HgCdTe, and outputs to the opposite side edges of the light receiving portion. A conductor pattern is provided.

As shown in the optical path diagram of FIG. 11, the infrared detecting device converts infrared rays radiated by an object into parallel rays by an objective lens system 3 (constituted by a concave lens 3A and a convex lens 3B in the figure), The parallel rays are converged by the condenser lens 4 on the light receiving surface of the infrared detecting element 2 to detect infrared rays.

However, a two-dimensional image cannot be obtained with the array of infrared detecting elements 2 as shown in FIG. Therefore, as shown in FIG. 11, the scanner 10 is provided between the objective lens system 3 and the condenser lens 4, and the scanner mirror 5 of the scanner 10 scans in the horizontal direction (H direction shown in FIG. 10). Then, I try to get a two-dimensional image.

As shown in FIG. 12, the scanner 10
Is provided with a shaft 12 vertically (or through the center) of the opposite end faces of the scanner mirror 5, and bearings 13A and 13B are provided on both sides of the shaft 12 of the scanner mirror 5 to mount the scanner mirror 5. It is pivotally supported.

Then, one end of the shaft 12 is connected to the motor.
By connecting to a drive shaft of 11 (for example, a DC motor) and driving the motor 11 in forward and reverse directions, the shaft 12, that is, the scanner mirror 5 is rotated at a desired swing angle (± α).

The image scanning area of the infrared detecting device is predetermined by the swing angle of the scanner mirror 5. By the way, since the scanner mirror 5 and the motor 11 have inertia, the scanner mirror 5 does not always rotate at the vibration angle that matches the commanded vibration angle. Therefore, it is necessary to provide a control system for automatic control.

Therefore, the shaft 12 on the side opposite to the motor 11
An angle detector 15 (for example, a resolver, a shaft encoder, etc.) is attached to the end of the. As described above, the scanner of the infrared detection device equipped with the angle detector 15 is shown in FIG.
As shown in FIG. 3, the setting unit 31 commands the motor 11 via the servo amplifier 32 about the swing angle of the scanner mirror 5, and the motor 11 imparts a rotational movement to the scanner mirror 5 so that the scanner mirror 5 actually moves. The swing angle is detected by the angle detector 15, and the detected information is fed back to the servo amplifier 32 via the compensation circuit 33 to control the actual swing angle of the scanner mirror 5.

The scanning method (scanning waveform) of the scanner of the infrared detector is shown in FIG. 14B with a triangular wave having a period T ₁ (for example, 30 Hz) as shown in FIG. 14A. There is a sawtooth wave having a period T ₂ (for example, 60 Hz).

In both cases of the triangular wave and the sawtooth wave, the command waveform is a sharp waveform consisting of a straight line, but as described above, the actual scanning waveform is caused by the inertia of the scanner mirror and the motor. The vicinity of the point) becomes an arc shape.

The scanning range (± α) of the straight line segment excluding the arc portion is the image effective scanning angle L, and the image effective scanning angle L becomes the image effective scanning region of the infrared detecting device. In the case of a triangular wave is effective scanning time t ₁ one-way T _1/2
It becomes shorter, for example, 11.66 ms, and a loss of scanning time, that is, a scanning blank time occurs.

Further, the effective scanning time in the case of sawtooth t ₂ is shorter than T _2/2, the blank time of the scan occurs, for example, a 11 · 666ms. Therefore, there is a demand for a scanner that has a small inertia of the motor and the scanner mirror, or that has a reduced inertia.

On the other hand, if the linearity in the image effective scanning area is deteriorated (wavy), the image distortion of the infrared detection device becomes large. Therefore, it is desirable that the linearity within the image effective scanning area is good.

[0014]

2. Description of the Related Art In order to reduce the blank time in scanning,
Conventionally, the scanner has a configuration as shown in FIG.

In the figure, reference numeral 14 denotes a bar made of a metal whose central portion is fixed to the shaft 12 (which is fixed to the shaft 12 by inserting the shaft 12 into a hole in the central portion and fixing the same). Is.

Reference numerals 20A and 20B are spring holding members fixed to the casing of the infrared detecting device so as to face each other with one end of the bar 14 interposed therebetween. Reference numeral 21A is a compression coil spring in which one seat portion is seated on the end surface side of one spring holding member 20A on the side of the bar 14 and mounted.

Reference numeral 21B is another compression coil spring which is mounted by seating one seat portion on the end surface side of the other spring holding member 20B on the bar 14 side. And a straight line connecting the terminal seat on the bar 14 side of the compression coil spring 21A and the rotation center line of the bar 14,
The apex angle of the other compression coil spring 21B, which is formed by a straight line connecting the terminal seat on the bar 14 side and the rotation center line of the bar 14, is 2α.

As described above, when the scanner mirror 5 is reversed, the end of the bar 14 is urged in the reverse direction by the repulsive force of the compression coil spring, so that the scanner mirror 5 and the motor 11 are driven.
, And the scan blank time is reduced as shown in FIG.

In FIG. 16, A ₁ indicated by a chain line is a command waveform, A ₂ indicated by a solid line is an actual scanning waveform,
α is the command swing angle, and the angle range shown by the dotted line is the image effective scanning angle L.

[0020]

By the way, in the conventional scanner in which the blank time in scanning is reduced by the repulsive force of the compression coil spring, when the bar collides with the compression coil spring, a chattering phenomenon occurs between the bar and the compression coil spring. Occurs.

Therefore, upon reversal, the scanner mirror vibrates and chattering K occurs in the scanning waveform as shown in FIG. That is, there is a problem that the linearity of the scanning waveform near the time of inversion is deteriorated and image distortion occurs in the infrared detection device.

Further, when the compression coil spring is used for a long period of time, the compression coil spring changes with time and the spring constant becomes small, which causes a problem that the scanning blank time increases. Further, since the scanner of the conventional infrared detecting device cannot adjust the operating time of the compression coil spring, it has almost no effect when applied to the one having the sawtooth wave as the scanning waveform.

The present invention was created in view of the above points, and an object of the present invention is to provide a scanner of an infrared detection device in which the occurrence of image distortion is suppressed and the blank time of scanning is short.

[0024]

In order to achieve the above object, the present invention provides a motor for rotating a scanner mirror 5 at a predetermined scanning angle with a shaft 12 as a rotation axis, as illustrated in FIG. 11, an angle detector 15 attached to the end portion of the shaft 12, a bar 40 made of a magnetic material, the center portion of which is attached to the shaft 12 so as to follow the scanner mirror 5 and pivot. A plurality of electromagnets 50A, 50B installed to face the end of the bar 40 with an angle larger than the scanning angle,
Prepare

The electromagnets 50A and 50B are configured to energize the ends of the bar 40 toward each other by energizing the bar 40 when the bar 40 is reversed at the far point side. As illustrated in FIG. 7, the bar is a permanent magnet 45.

The electromagnets 50A and 50B are energized when the permanent magnet 45 is reversed at the far point side, so that the end portions of the permanent magnet 45 are biased toward each other. Alternatively, the bar is the permanent magnet 45. The electromagnets 50A and 50B are the permanent magnets 45
It is assumed that the end portion of the permanent magnet 45 is biased in the far direction by energizing at the time of reversal at the near point side.

Alternatively, the bar is a permanent magnet 45. The electromagnets 50A and 50B are energized when reversing the permanent magnet 45 on the far point side, thereby urging the ends of the permanent magnet 45 toward each other and energizing when reversing the permanent magnet 45 on the near point side. By doing so, the end of the permanent magnet 45 is urged in the direction away from the permanent magnet 45.

As shown in FIG. 9, a motor 11 for rotating the scanner mirror 5 at a predetermined scanning angle with the shaft 12 as a rotation axis and an angle detector 15 with the shaft 12 attached thereto.
A bar 40 whose central portion is attached to the shaft 12 so as to follow the scanner mirror 5 and to make a rotational movement, and a plurality of bars 40 which are installed to face the end portions of the bar 40 at an angle larger than the scanning angle. Of the solenoid coil 55-1,55-2,55-3,55-4 and the hollow part of the solenoid coil 55-1,55-2,55-3,55-4 Rod-shaped magnetic cores 48-1 and 48-2 made of a magnetic material are attached to both ends, respectively.

The solenoid coils 55-1,55-2,55-
3,55-4 attracts the magnetic core bodies 48-1 and 48-2 into the hollow portion and energizes the end portion of the bar 40 in the direction of approaching by energizing when the bar 40 is reversed at the far point side. And

The scanning waveform of the infrared detector is set to a triangular wave by setting the amplitude and the pulse width of the current alternately flown through the electromagnet or the solenoid coil to the same value. Further, the amplitude and pulse width of the electric current alternately flown through the electromagnet or the solenoid coil are set to predetermined different values, and the scanning waveform of the infrared detection device is a sawtooth wave.

[0031]

According to the present invention, the electromagnet or the solenoid coil is energized at the time of reversing on the far point side of the bar to urge the end portion of the bar toward the end.

Therefore, since the inertia of the motor and the scanner mirror is weakened, the scanning blank time is shortened and the effective image scanning angle approaches the command swing angle. Further, since the bar does not collide with other members such as springs, the chattering phenomenon does not occur when the scanner mirror is inverted.

That is, since there is no possibility of the linearity of the scanning waveform being deteriorated, image distortion does not occur in the infrared detecting device. Further, according to the present invention, the bar is made a permanent magnet, and the polarity of the electromagnet is reversed, so that the permanent magnet is weakened or urged by a stronger force.

Therefore, the scanning blank time is further shortened, and the image effective scanning angle becomes closer to the command vibration angle. On the other hand, by making the amplitude and the pulse width of the electric current alternately applied to the electromagnet or the solenoid coil equal, the scanning waveform becomes a triangular wave of a desired constant shape.

Further, by setting the amplitude and pulse width of the current alternately flowing through the electromagnet or the solenoid coil to predetermined different values, the scanning waveform becomes a sawtooth wave having a desired constant shape.

[0036]

The present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same objects throughout the drawings.

FIG. 1 is a block diagram of an embodiment of the invention of claim 1,
FIG. 2 is a block diagram of a control system according to the present invention, FIG. 3 is a diagram showing an essential part of the invention of claim 1, and FIG. 4 is a diagram showing an essential part of another embodiment of the invention of claim 1.

FIG. 5 is a diagram for explaining the action applied to the triangular wave, FIG. 6 is a diagram for explaining the action applied to the sawtooth wave, and FIG. 7 is a diagram of the embodiment of the tooth of claim 2, and FIG. Is claim 2
FIG. 9 is a view for explaining the action of the tooth of FIG.

As shown in FIG. 1, the scanner 10 is
A shaft 12 is provided vertically (or through the center) at the center of the opposite end faces of the scanner mirror 5.
Bearings 13A and 13B are provided on both sides of the scanner mirror 5 to rotatably support the scanner mirror 5.

Then, one end of the shaft 12 is connected to the motor.
By connecting to a drive shaft of 11 (for example, a DC motor) and driving the motor 11 in forward and reverse directions, the shaft 12, that is, the scanner mirror 5 is rotated at a desired swing angle (± α).

Reference numeral 40 denotes a prismatic bar made of a magnetic material whose central portion is fixed to the shaft 12 (which is fixed to the shaft 12 by penetrating and fixing the shaft 12 in a hole in the central portion).

Reference numerals 50A and 50B are electromagnets fixed to the casing of the infrared detecting device so as to face each other with one end of the bar 40 interposed therebetween. A straight line connecting the end surface of the electromagnet 50A on the bar 40 side and the rotation center line of the bar 40, and a straight line connecting the end surface of the other electromagnet 50B on the bar 40 side and the rotation center line of the bar 40,
The apex angle is set to be larger than 2α.

As shown in FIG. 2, the scanner of the infrared detecting device constructed as described above is arranged such that the vibration angle of the scanner mirror 5 from the setting section 31 is transmitted to the motor 11 via the servo amplifier 32.
To the scanner mirror 5 by the motor 11, and the actual swing angle of the scanner mirror 5 is detected by the angle detector.
The information detected by 15 is fed back to the servo amplifier 32 via the compensating circuit 33 to control the actual swing angle of the scanner mirror 5.

On the other hand, when the scanner mirror 5 is reversed, the setting section 31 issues an instruction to the current instruction generating circuit 35, and the current instruction generating circuit 35 issues a predetermined signal to the current amplifiers 36A and 36B alternately.

As a result, the current amplifiers 36A and 36B are adapted to the electromagnets 50A and 50B corresponding to the currents of the predetermined amplitude and pulse width.
Supply to. More specifically, as shown in FIG. 3 (A), the motor 11 causes the end of the bar 40 to rotate in the direction of one electromagnet 50B, and immediately before the motor 11 reversely rotates, that is, the scanner mirror 5 is the end point of the forward path. Immediately before reaching (at the time of inversion of a predetermined swing angle), a current having a predetermined amplitude and pulse width is supplied to the other electromagnet 50A.

As a result, the electromagnet 50A attracts the end of the bar 40. Therefore, the inertia of the motor 11 and the scanner mirror 5 is weakened, and the motor 11 reverses at the end point of the commanded angle. That is, the scanner mirror 5 is inverted at a position close to a predetermined swing angle.

The inverted scanner mirror 5 rotates at a constant angular velocity equal to the rotation of the motor 11. Then, as shown in FIG. 3B, just before the end of the bar 40 rotates in the direction of the other electromagnet 50A and the motor 11 reversely rotates, that is, the scanner mirror 5 ends at the end of the return path (predetermined vibration). Immediately before reaching (when the angle is reversed), a current having a predetermined amplitude and pulse width is supplied to the other electromagnet 50B.

As a result, the electromagnet 50B attracts the end of the bar 40. Therefore, the inertia of the motor 11 and the scanner mirror 5 is weakened, and the motor 11 reverses at the end point of the commanded angle. That is, the scanner mirror 5 is inverted at a position close to a predetermined swing angle.

By repeating this, the scanner mirror 5 performs the rotational movement at the commanded swing angle. It should be noted that the electromagnet does not face the one end of the bar 40, but the electromagnet is attached to the one end of the bar 40 as shown in FIG.
The same effect can be obtained by installing 50A and another electromagnet 50B at the other end of the bar 40.

The scanner of the infrared detecting device constructed as described above can be applied to a triangular wave as shown in FIG. FIG. 5A shows the command waveform A ₁ , which is (B-
1) shows the current that flows through one electromagnet 50A, and (B-2)
Indicates the current passed through the other electromagnet 50B, and (C) indicates the scanning waveform A ₂ by which the scanner mirror 5 actually rotates.

As shown in (B-1) and (B-2) of FIG. 5, the amplitude of the current alternately applied to the electromagnets 50A and 50B immediately before reaching the end points of the forward and backward paths of the scanner mirror 5. And the pulse widths are made equal.

As a result, the attraction force and the attraction time for reducing the inertia of the motor 11 and the scanner mirror 5 become equal. Therefore, the motor 11 rotates at the instructed equiangular velocity, and the scanner mirror 5 also rotates at the instructed equiangular velocity. Therefore, the scanning waveform A ₂ of the scanner mirror 5 is almost equal to the command waveform (triangular wave) A ₁ .

FIG. 6 shows the scanning waveform A ₂ applied to the sawtooth wave. In FIG. 6, (A) shows the command waveform A ₁ , (B-1) shows the electric current flowing through one electromagnet 50A, (B-2) shows the electric current flowing through the other electromagnet 50B, and (C ) Indicates the scanning waveform A _{2 in} which the scanner mirror 5 actually rotates.

As shown in (B-1) and (B-2) of FIG. 6, one of the electromagnets is immediately before the end of the forward path of the scanner mirror 5 is reached.
A current with a large amplitude and a large pulse width is applied to 50A.
Then, the motor 11, that is, the scanner mirror 5 is reversed, the rotary movement of the return path is performed at a higher uniform angular velocity, and immediately before the end of the return path is reached, a current having a small amplitude and a small pulse width is supplied to the other electromagnet 50B. As a result, the motor 11 performs a saw-tooth-shaped rotational motion in which the commanded forward angular velocity is slow and the backward angular velocity is fast.

Therefore, the scanner mirror 5 also performs the instructed sawtooth-shaped rotational movement. Therefore, the scanner mirror 5
The scanning waveform A _{2 of} is almost equal to the command waveform (sawtooth wave) A ₁ .

According to the present invention, the bar made of the magnetic material of FIG. 1 is replaced by a prismatic permanent magnet 45. The invention of claim 2 energizes one electromagnet 50A installed near the end point of the return path immediately before reaching the end point of the forward path of the scanner mirror 5, and has a polarity different from the polarity of the corresponding end of the permanent magnet 45. Is generated in the electromagnet 50A, and the end of the permanent magnet 45 is urged toward the end.

Immediately before reaching the end point of the return path of the scanner mirror 5, the other electromagnet installed near the end point of the outward path.
By energizing 50B, a polarity different from the polarity of the corresponding end of the permanent magnet 45 is generated in the electromagnet 50B, and the end of the permanent magnet 45 is urged toward.

In the third aspect of the invention, immediately before the end of the forward path of the scanner mirror 5 is reached, one of the electromagnets 50B installed near the end of the forward path is energized so that the polarity of the corresponding end of the permanent magnet 45 is changed. The same polarity is generated in the electromagnet 50B, and the end of the permanent magnet 45 is urged in the far direction.

Immediately before reaching the end point of the return path of the scanner mirror 5, the other electromagnet installed near the end point of the return path.
By energizing 50A, the same polarity as that of the corresponding end of the permanent magnet 45 is generated in the electromagnet 50A, and the end of the permanent magnet 45 is urged in the far direction.

In the invention of claim 4, as shown in FIGS. 7 and 8, immediately before the end of the forward path of the scanner mirror 5 is reached,
The polarity of the corresponding end of the permanent magnet 45 (N polarity in the figure) is applied by energizing one electromagnet 50A installed near the end point of the return path.
A different polarity (S polarity) from that of the permanent magnet 45 is generated in the electromagnet 50A to urge the end of the permanent magnet 45 in a direction to approach, and the other electromagnet 50B installed near the end point of the outward path is energized to generate the permanent magnet 45A. The same polarity (N polarity) as that of the corresponding end portion (N polarity) is generated in the electromagnet 50B, and the end portion of the permanent magnet 45 is urged in the far direction.

Then, as shown in FIG. 7B, immediately before the end point of the return path of the scanner mirror 5 is reached, the electromagnet 50B installed near the end point of the outward path is energized to correspond to the permanent magnet 45. Polarity (S polarity) different from the edge polarity (N polarity)
Is generated in the electromagnet 50B, the end of the permanent magnet 45 is urged toward, and the electromagnet 50A installed near the end of the forward path is energized to generate the polarity (N) of the corresponding end of the permanent magnet 45. The same polarity (N polarity) as that of the electromagnet 50
A is generated in A, and the end of the permanent magnet 45 is urged in a direction away from it.

In the illustrated embodiment, a pair of electromagnets 50A and 50B are arranged opposite to one end of the permanent magnet 45. However, a pair of electromagnets 50A and 50B are opposed to both ends of the permanent magnet 45. Since the attraction force and the repulsion force are balanced by arranging the electromagnet, the scanning waveform of the obtained scanner mirror is improved in a more desirable direction.

According to a fifth aspect of the present invention, as shown in FIG. 1, a shaft is provided perpendicularly (or through the central portion) to the center of the opposite end faces of the scanner mirror, and bearings are provided on both sides of the scanner mirror of this shaft. Is provided to rotatably support the scanner mirror.

Then, one end of the shaft 12 is connected to the drive shaft of the motor, and the motor is driven to rotate in the forward and reverse directions to rotate the scanner mirror at a desired swing angle. Then, as shown in FIG. 9, the central portion of the prismatic bar 40 is fixed to the shaft 12 so that the bar 40 follows the scanner mirror and rotates.

A pair of solenoid coils 55-1 and 55-2 are installed at one end of the bar 40 so as to face each other with an angle larger than the scanning angle. Further, another pair of solenoid coils 55-3, 55-4 are installed at the other end of the bar 40 so as to face each other with an angle larger than the scanning angle.

Reference numeral 48-1 is a rod-shaped magnetic core body mounted on one end of the bar 40 so as to be swingable about the pin 42. The magnetic core body 48-1 is attached to the bar 40 so that it can be inserted into and removed from the hollow portions of the solenoid coils 55-1 and 55-2.

Reference numeral 48-2 is a rod-shaped magnetic core body mounted on the other end of the bar 40 so as to be swingable about the pin 42. The magnetic core body 48-2 is attached to the bar 40 so that it can be inserted into and removed from the hollow portions of the solenoid coils 55-3 and 55-4.

Incidentally, in FIG. 9, the solenoid coils 55-1 and 5
5-2 is shown in a sectional view, and solenoid coils 55-3 and 55-4 are shown in an external view. In the scanner configured as described above, the bar 40 is rotated forward by the motor as shown in FIG. 9 (A), and one half of the magnetic core body 48-1 is hollow with the solenoid coil 55-1. Deep inside the part, one half of the other magnetic core body 48-2 is diagonally opposed to another solenoid coil 55.
-4 is inserted deep into the hollow part, and immediately before the motor reversely rotates, that is, just before the scanner mirror reaches the end point of the forward path, the solenoid coil 55-2 and the solenoid coil 55-2 are arranged opposite to the solenoid coil 55-1. A current having a predetermined amplitude and pulse width is supplied to a solenoid coil 55-3 arranged to face 55-4.

As a result, the solenoid coil 55-2 attracts the half of the magnetic core body 48-1 and the solenoid coil 55-3 attracts the other half of the magnetic core body 48-2. Therefore, the inertia of the motor and scanner mirror is de-energized and the motor reverses at the end of the forward trip of the commanded angle. That is, the scanner mirror is turned over at a position close to a predetermined swing angle.

Then, as shown in FIG. 9B, the motor causes the bar 40 to rotate in the return path, and the other half of the magnetic core body 48-1 is deep inside the hollow portion of the solenoid coil 55-2 and the other half thereof is The other half of the magnetic core body 48-2 is inserted deep inside the hollow portion of the other solenoid coil 55-3 diagonally opposed to each other, just before the motor reversely rotates, that is, the scanner mirror is at the end of the return path. Immediately before reaching the solenoid coil 55-2, the solenoid coil 55-1 and the solenoid coil are arranged to face the solenoid coil 55-2.
A current having a predetermined amplitude and pulse width is supplied to a solenoid coil 55-4 arranged to face 55-3.

As a result, the solenoid coil 55-1 attracts the half body of the magnetic core body 48-1 and the solenoid coil 55-4 attracts the half body of the other magnetic core body 48-2. Therefore, the inertia of the motor and scanner mirror is de-energized and the motor reverses at the end of the return trip at the commanded angle. That is, the scanner mirror is turned over at a position close to a predetermined swing angle.

[0072]

The present invention constructed as described above has the following effects. By energizing the electromagnet or solenoid coil at the time of reversing on the far point side of the bar and urging the end of the bar toward, the inertia of the motor and scanner mirror is reduced, and the scan blank time is reduced. In addition, the scanning swing angle approaches the command swing angle.

Further, since the bar does not collide with other members at the time of reversing, the chattering phenomenon does not occur at the time of reversing the scanner mirror. That is, since the linearity of the scanning waveform does not deteriorate, image distortion does not occur in the infrared detection device.

Further, in the scanner using the bar as the permanent magnet, the polarity of the electromagnet is reversed, so that the permanent magnet is deenergized or urged by a stronger force, the scanning blank time is further shortened, and the scanning vibration is reduced. The angle approaches the command swing angle.

Furthermore, by making the amplitude and pulse width of the electric current alternately applied to the electromagnets or solenoid coils equal, the scanning waveform becomes a triangular wave of a desired constant shape.
On the other hand, by setting the amplitude and the pulse width of the electric current alternately applied to the electromagnets or the solenoid coils to different values by a predetermined value, the scanning waveform becomes a sawtooth wave having a desired constant shape.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the invention of claim 1;

FIG. 2 is a block diagram of a control system according to the present invention.

FIG. 3 is a diagram showing an essential part of the invention of claim 1;

FIG. 4 is a diagram showing the main points of another embodiment of the invention of claim 1;

FIG. 5 is a diagram illustrating an operation applied to a triangular wave.

FIG. 6 is a diagram illustrating an operation applied to a sawtooth wave.

FIG. 7 is a diagram of an embodiment of the tooth of claim 2;

FIG. 8 is a view for explaining the action of the tooth according to claim 2;

FIG. 9 is a diagram of an embodiment of the tooth of claim 5;

FIG. 10 is a perspective view of an infrared detection element.

FIG. 11 is an optical path diagram of the infrared detection device.

FIG. 12 is a diagram showing a basic configuration of a scanner.

FIG. 13 is a block diagram of a control system of the scanner.

FIG. 14 is a diagram showing a scanning waveform.

FIG. 15 is a configuration diagram of a conventional scanner.

FIG. 16 is a diagram showing a conventional scanning waveform.

[Explanation of symbols]

1 Substrate 2 Infrared Detector 3 Objective Lens System 4 Condenser Lens 5 Scanner Mirror 10 Scanner 11 Motor 12 Shaft 15 Angle Detector 14,40 Bar 31 Setting Section 32 Servo Amplifier 33 Compensation Circuit 35 Current Command Generation Circuit 45 Permanent Magnet 45 48 -1,48-2 Magnetic core 50A, 50B Electromagnet 55-1,55-2,55-3,55-4 Solenoid coil

Claims (7)

[Claims] 1. A motor for rotatively driving a scanner mirror with a shaft as a rotation axis at a predetermined scanning angle, an angle detector attached to an end portion of the shaft, and a rotation driven by following the scanner mirror. A bar made of a magnetic material having a central portion axially attached to the shaft so as to move dynamically, and a plurality of electromagnets installed so as to face the ends of the bar at an angle larger than the scanning angle. A scanner of an infrared detection device, wherein the electromagnet is energized at the time of reversing on the far point side of the bar to urge the end of the bar toward the approaching direction. 2. The bar according to claim 1, wherein the bar is a permanent magnet, and the electromagnet energizes at the time of reversal of the permanent magnet on the far point side to bias the end of the permanent magnet toward the approaching direction. An infrared detection device scanner characterized by being a thing. 3. The bar according to claim 1, wherein the bar is a permanent magnet, and the electromagnet energizes in a direction away from the permanent magnet by energizing at the time of reversal on the near point side of the permanent magnet. An infrared detection device scanner characterized by being a thing. 4. The bar according to claim 1, wherein the bar is a permanent magnet, and the electromagnet energizes at the time of reversal on the far point side of the permanent magnet to urge the end of the permanent magnet toward the approaching direction. A scanner for an infrared detection device, characterized in that by energizing the permanent magnet at the time of reversal on the near point side, the end portion of the permanent magnet is biased in a direction away from the permanent magnet. 5. A motor for rotating and driving a scanner mirror with a shaft as a rotation axis at a predetermined scanning angle, an angle detector attached to an end portion of the shaft, and a rotation driven by following the scanner mirror. A bar having a central portion pivotally attached to the shaft so as to move dynamically; a plurality of solenoid coils installed so as to face the ends of the bar at an angle larger than the scanning angle; and a hollow portion of the solenoid coil. A bar-shaped magnetic core body made of a magnetic material attached to both ends of the bar so that the solenoid coil is energized at the time of reversing at the far point side of the bar, A scanner for an infrared detection device, wherein the magnetic core is sucked into a hollow portion and is biased toward the end portion of the bar. 6. The scanning waveform of the infrared detection device is set to a triangular wave by setting the amplitude and the pulse width of the electric current alternately applied to the electromagnet or the solenoid coil to be equal values. Or a scanner of the infrared detection device described in 5. 7. The scanning waveform of the infrared detection device is a sawtooth wave, with the amplitude and pulse width of the current alternately flowing through the electromagnets or solenoid coils being set to different predetermined values. A scanner of the infrared detection device according to 3, 4, or 5.