JP3067745B2 - Non-reaction scanning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a spacecraft such as an artificial satellite and has a function of canceling a reaction torque caused by acceleration / deceleration of a rotating body inside the device, thereby enabling the satellite body to be positioned in a zero gravity field. I tried to eliminate the influence,
The present invention relates to a reactionless scanning device mainly used in space.

[0002]

2. Description of the Related Art When a device mounted on a satellite flying in a zero-gravity field performs a rotational acceleration / deceleration motion, a reaction force thereof becomes a disturbance to attitude control of the satellite body. For example, when a disk prism of a scanning device mounted on a satellite performs a rotational acceleration / deceleration motion to scan a transmitted laser beam, the reaction torque due to the rotational acceleration / deceleration motion becomes a disturbance and affects the attitude of the satellite body. become.

Conventionally, such disturbances have been dealt with by maintaining the attitude of the satellite using an attitude control function provided on the satellite body.

[0004]

However, if the attitude control function of the satellite body attempts to cope with the effects of disturbances caused by the on-board devices, there are problems that the attitude control becomes complicated and the power load increases. Was.

In view of the above circumstances, the present invention provides a space-free reactionless scanning device in which the device itself has a function of canceling the reaction force so that the satellite body is not affected by any disturbance. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a non-reaction scanning apparatus, comprising: a rotating optical member for scanning a laser beam; a motor for rotating the rotating optical member; and a rotation of the rotating optical member. Bei a balance weight for canceling a reaction torque due to the rotational acceleration and deceleration movement of the rotating optical element by being rotated in reverse in conjunction with exercise
The balun is interlocked with the rotating optical member
A reverse speed-up mechanism for speeding up and rotating the weight in reverse is provided.
It consists of a combination of multiple gears as a reversing speed-up mechanism
It is characterized by using a reversing speed increasing gear mechanism .

According to a second aspect of the present invention, in the non-reaction scanning apparatus according to the first aspect, the rotating optical member is circular.
It is a disc prism .

[0008]

[0009]

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a non-reaction scanning device for space according to an embodiment, and FIG. 2 is a schematic perspective view of the device.

In FIG. 1, reference numeral 1 denotes a rotating disk-shaped prism (rotating optical member). This disk prism 1 rotates to transmit laser light 1
1 is circularly scanned by the refraction effect. Disc prism 1
Is fixed to the first rotor 2, and the rotation is adjusted by the rotation balance weight 12.

The first rotor 2 is rotatably supported via a first bearing 4 by a first stator 3 which holds the entire apparatus. Reference numeral 5 denotes a hollow motor / angle detector, and the hollow motor / angle detector 5 includes a first bearing 4
And a disc prism 1 via a first rotor 2.
, And controls its rotational movement.

Reference numeral 6 denotes a reversing speed increasing gear mechanism. The reversing speed increasing gear mechanism 6 includes an input gear 61, an output gear 62, and a fixed gear 63. The fixed gear 63 of the reversing speed increasing gear mechanism 6 is fixed to the second stator 8 connected to the first stator 3. The input gear 61 is connected to the first rotor 2 via the second rotor 7. Output gear 62
Are connected to an inversion balance weight 10. The reversing balance weight 10 is connected to a second stator 8 via a second bearing 9 arranged coaxially with the first bearing 4.
Is held rotatably. Then, the reversing speed increasing gear mechanism 6 is configured such that the first rotor 2 → the second rotor 7 → the input gear 6
The rotational motion input through the path of 1 is reversed and 1
The speed is increased to about 00 times, and output from the output gear 62 to the reversal balance weight 10.

Next, the operation will be described. The transmission laser beam 11 is scanned in an annular shape by the refraction effect of the rotating disk prism 1. The rotational movement of the disk prism 1 is controlled by a hollow motor / angle detector 5 via a first rotor 2 and a first bearing 4, and acceleration / deceleration is performed by an external angle command. The rotational balance of the disk prism 1 is accurately adjusted by the rotational balance weight 12, and vibration due to mass unbalance does not occur.

The rotational movements of the disk prism 1 and the first rotor 2 are input to a reversing speed increasing gear mechanism 6 via a second rotor 7. The reversing speed increasing gear mechanism 6 reverses the rotational motion entering the input gear 61, increases the speed by about 100 times, and outputs it to the reversing balance weight 10 from the output gear 62. As a result, the reversing movement of the reversing balance weight 10 is performed about 100 times faster than the rotating movement of the disk prism 1.

Here, the sum of the inertia inertia of the components moving in the direction of rotation of the hollow motor / angle detector 5, such as the disk prism 1, is set to J1 and the reversing speed increasing gear mechanism 6, such as the reversing balance weight 10, is used to move the sum in the reverse direction. The sum of the inertia inertia of the moving parts is J2, and the hollow motor / angle detector 5
If the acceleration / deceleration controlled by is Ω and the speed-up magnification in the reversing speed-up gear mechanism 6 is R, J1 ·
By setting J1, J2, and R that satisfy Ω = J2 (R · Ω), it is possible to eliminate the reaction due to the rotational torque generated when the disk prism 1 accelerates or decelerates. In other words, by installing the lightweight reversing balance weight 10 via the reversing speed-up gear mechanism 6 for the disc prism 1 rotating in the positive direction, the recoil generated by the acceleration / deceleration of the disc prism 1 can be reduced. It can be canceled by 10 reverse rotations.

In this case, when the speed-increasing magnification R in the reversing speed-up gear mechanism 6 is set to 100, the inertia inertia of the component moving in the reverse rotation direction by the reversing speed-up gear mechanism 6 such as the reversal balance weight 10 is , 1/100 of the inertia inertia J1 of the forward rotation portion, so that the reversing balance weight 10 can be made small and lightweight.

Incidentally, the disk prism 1, which is a rotating optical member shown in the above-described embodiment, can be formed according to the configuration of an optical system.
It can be replaced with a hologram or reflection mirror. Further, by combining a plurality of the above-described scanning devices, the scanning pattern can be expanded.

[0019]

As described above, according to the present invention,
Since the balance weight is reversely rotated in conjunction with the rotational movement of the rotating optical member (for example, a disk prism), it is possible to cancel the reaction torque due to the acceleration / deceleration of the rotating optical member. Therefore, it is possible to eliminate the recoil caused by the rotational motion in the zero-gravity field, and it is not necessary to deal with the recoil by the attitude control function of the satellite body. Is done.

When the balance weight is rotated at a high speed by the reversing speed increasing mechanism, the angular momentum can be amplified, so that the balance weight can be reduced in size and weight. The reversing speed-up mechanism in this case can be easily realized by using a speed-up gear.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reactionless scanning device for space according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the reactionless scanning device for space.

[Explanation of symbols]

 1 disk prism (rotating optical member) 5 hollow motor / angle detector (motor) 10 inversion balance weight

Claims (2)

(57) [Claims] A rotating optical member for scanning a laser beam; a motor for rotating the rotating optical member; and a rotating member for rotating the rotating optical member by being reversely rotated in conjunction with the rotating movement of the rotating optical member. and a balance weight for canceling a reaction torque by the deceleration motion, the balance window in conjunction with the rotation movement to the rotary optical member
A reversing speed-up mechanism for speeding up and reversing the gates is provided.
A non-reaction scanning device using a reversing speed increasing gear mechanism . 2. The non-reaction scanning apparatus according to claim 1, wherein the rotating optical member is a disk prism.