JPH0353214A - Mirror driving device - Google Patents

Abstract

PURPOSE:To obtain the mirror driving device which can track a target with high accuracy and at a high speed by dividing a driving system of an AZ rotary shaft of a mirror and an AZ shaft of a dome for protecting the mirror. CONSTITUTION:The subject device is provided with a dome 7A held by an AZ rotary shaft housing 8 by a bearing 4, and a dome driving motor 13 for rotating the dome 7A by AZ shaft through a pinion gear 14 and an internal tooth gear 15. In this state, at the time of bringing a mirror 1 to AZ rotation, an EL rotary shaft housing 5 and the dome 7A are divided, therefore, the moment of inertia and the friction torque around an AZ rotary shaft 6 applied to an AZ shaft driving motor 3b become small. In such a way, a target can be tracked at a high speed and with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mirror driving device for driving an optical mirror with high precision.

[Conventional technology]

Figure 3 is a vertical side view showing a conventional mirror drive device;
The figure is also a vertical front view, in which (1) is a mirror and (2) is an EL rotated by a drive motor (3 m).
The rotating shaft (4) is the bearing, (5) is the EL rotating shaft (2
), (6) is the AZ rotation shaft rotated by the drive motor (3b), (7) is the AZ rotation shaft
It is attached to the rotating shaft (6) and has a mirror (1) and 8 inside.
The dome that houses the L rotation axis (2) and the EL rotation axis housing (5), (8) is the AZ rotation axis (6) and the dome (7)
(9) is a synchro that detects the rotation angle, (10) is a window through which the incident light (11) passes, and (12) is the reflected light reflected by the mirror (1).

Next, the operation will be explained. When rotating the mirror (1) on the EL axis, rotate the EL axis drive motor (3a),
The rotation angle is detected by the synchronizer (9). Also, when rotating the mirror (1) on the AZ axis, the AZ axis drive motor (
3b), the AZ rotation shaft (6) and the dome (7) are rotated. EL rotating shaft housing (2) that holds the EL rotating shaft (2) to which the mirror (11 is glued)
5) is attached to the dome (7), so Mi 9-(
1》Ha}' - With Ham (7) Ni AziIIIl! After one rotation, the rotation angle is detected by one synchro (9).

[Problem to be solved by the invention]

In the conventional mirror drive device, as described above, the dome (7) is also rotated along with the mirror (1>) on the AZ rotation axis (6).
The moment of inertia and friction torque around the AZ rotation axis (6) become large, making it impossible to track targets with high accuracy and high speed.
There were problems such as the Z-axis drive motor (3b) also becoming larger.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a mirror drive device that can track a target with high precision and high speed.

[Means to solve the problem]

The mirror drive device according to the present invention has an E
Directly attach the EL rotation shaft No.1 housing that holds the L rotation shaft^2
An AZ dedicated to the dome is attached to the rotation axis and a window for the incident light to pass through is attached for the dome's AZ axis rotation.
It is equipped with a shaft drive motor.

[Effect]

In this invention, the EL rotation shaft no. 1 housing is directly
By fastening to the Z rotation axis, the moment of inertia and friction torque around the AZ rotation axis are reduced, enabling faster and more accurate tracking of the tracking target, and making it possible to reduce the size of the AZ@ drive motor. can.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In Fig. 1, (11 to (6)) are completely the same as the above conventional device. (7A) is A by bearing (4).
Dome (1) held in Z rotation axis no.1 housing (8)
3) is a dome drive motor that rotates the dome (7A) about the AZ axis via a pinion gear (14) and an internal gear (15).

In the mirror drive AH device configured as described above, when rotating the mirror (1) on the AZ axis, the EL rotation shaft housing (5) and the dome (7A) are separated, so
The moment of inertia and frictional torque of the Z-axis drive motor (3b) around the AZ rotation axis (6) are reduced, making it possible to track targets with greater precision and accuracy.

Fig. 2 shows another embodiment of the present invention, in which the upper end of the EL rotating shaft housing (5A) is fixed to the AZ rotating shaft (6), and the lower end of the EL rotating shaft housing (5A) is fixed to the bearing (4). It is connected to the dome (7A) via.

Although this increases the moment of inertia and frictional torque to some extent, it is possible to create a structure that is resistant to external vibrations and shocks.

〔Effect of the invention〕

As described above, according to the present invention, by separating the drive systems for the AZ rotation axis of the mirror and the AZ axis of the dome that protects the mirror, it is possible to obtain high tracking accuracy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a mirror driving device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view showing another embodiment of the invention, and FIG. 3 is a longitudinal sectional side view showing a conventional mirror driving device. , FIG. 4 is a longitudinal sectional front view showing a conventional mirror driving device. In the figure, (1) is the mirror, (2) is the EL rotation axis, (
3a) s (3b) is the drive motor, (4)
is the bearing, (5) is the EL rotation shaft housing, (6) is the AZ rotation shaft, (7A) is the dome, (8) is the AZ rotation shaft housing, and (13) is the dome drive motor. show. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A mirror glued to the EL rotation shaft of the elevation drive motor, and an E that is attached to the AZ rotation shaft of the azimuth drive motor and holds the EL rotation shaft with a bearing.
An L rotating shaft housing, an AZ rotating shaft housing that holds the AZ rotating shaft with a bearing, and a dome drive motor attached to the AZ rotating shaft housing rotates in the azimuth direction, and the mirror and the EL rotating shaft housing are housed inside. A mirror drive device characterized by comprising a dome for storing the mirror.