JP2743715B2 - Spacecraft Optical Equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for correcting a deviation in the directional direction of an image pickup device mounted on a spacecraft such as an artificial satellite. The present invention relates to an optical device mounted on a spacecraft capable of correcting on-board deviation of the directional direction of an optical system due to disturbances such as a launch environment and attitude change.

[0002]

2. Description of the Related Art A conventional optical device mounted on a spacecraft is caused by a slight displacement of an image pickup device due to vibration at the time of launching, or a disturbance generated due to a change in attitude in orbit and an operation of a movable device. When correcting a small deviation of the image, send the data to the ground and correct it by image processing,
When performing on-board correction, as shown in FIG. 4, a reflection mirror 7 is mounted to change the angle and correct the optical axis directing direction.

[0003]

In the case of image correction on the ground, programming development is required, and the amount of work is enormous because image processing involves an artificial operation, so that much time is required for image processing. The problem is that information cannot be obtained immediately, and the distortion of the original image data cannot be completely removed. There is.

A reflecting mirror 7 is provided in front of the condensing means 3 of the optical system.
In the method shown in FIG. 4 in which the direction of the optical axis is controlled by adjusting the angle of the two axes with respect to the optical axis, the direction of the optical axis can be corrected in real time, but with the increase in the size of the optical system, The reflection mirror 7 and its driving mechanism are enlarged,
It is not suitable as a spacecraft mounting device that requires light weight and low power, and it is difficult to obtain high-speed control response with the increase in the size of the reflection mirror 7. In the case of a multi-band configuration in which images are separated and received by a plurality of image sensors, there is a problem that a relative error between the bands cannot be corrected.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a device capable of reducing the size and correcting the directivity on-board.

[0006]

SUMMARY OF THE INVENTION The present invention provides a light condensing means including a lens system, a parallel plane transmission glass disposed on an optical axis of the light condensing means and transmitting light, and a periphery of the parallel plane transmission glass. And a plurality of linear actuators for adjusting the angle of the glass with respect to the optical axis, and control means for calculating a correction amount and operating the linear actuator.

[0007] It is preferable that an image pickup device is disposed at a light condensing position on the optical axis, and the control means includes means for controlling an angle by the linear actuator so that an output signal of the image pickup device is maximized.

[0008]

The control means inputs positional deviation information detected by the image sensor, and calculates a correction amount based on the information. Next, each linear actuator is expanded and contracted so that the optical axis moves by the calculated correction amount, and the angle of the parallel plane transmission glass with respect to the light beam is adjusted. As a result, it is possible to correct the deviation of the directivity direction on-board, and it is possible to arrange the parallel plane transmission glass at a position where the light beam on the optical path is narrowed, so that the size can be reduced, and furthermore, the multi-band optical system can In such a case, the gap between the bands can be corrected by arranging the plane-parallel transmission glass immediately before each image sensor.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration and principle of a main part of the first embodiment of the present invention, and FIG. 3 is a perspective view showing an attached state of a parallel plane transmission glass and a linear actuator according to the first and second embodiments of the present invention. is there.

In the first embodiment of the present invention, an image pickup element 6 for picking up an image, a light condensing means 3 including a lens system for condensing light on the image pickup element 6, and a light condensing lens constituting the light condensing means 3 Parallel plane transmission glass 1 arranged on the optical axis between and transmitting light
A plurality of linear actuators 2 that support the periphery of the parallel plane transmission glass 1 and adjust the angle of the glass 1 with respect to the optical axis; The imaging device 6 is disposed at a condensing position on the optical axis, and the control unit 10 controls the angle by the linear actuator 2 so that the output signal of the imaging device 6 is maximized. Including means to do.

The light beam passes through the plane-parallel transmission glass 1 and enters the image sensor 6. Here, the parallel plane transmission glass 1 is X
By tilting around the axis, the optical axis 4 is refracted in the plane-parallel transmission glass 1, the light flux is shifted in the Y direction, and the angle is changed about the X axis as shown by the optical axis 5. Similarly, by rotating the parallel plane transmission glass 1 about the Y axis, the angle of the optical axis is also changed about the Y axis.

FIG. 2 is a diagram showing a configuration of a main part of a second embodiment of the present invention. In the second embodiment of the present invention, the plane-parallel transmission glass 1 is disposed between the light converging means 3 and the image sensor 6. In the case of the second embodiment, since the plane-parallel transmission glass 1 is disposed at a position where the light beam on the optical path is converged by the light condensing means 3, the size can be further reduced, and an apparatus constituting a multi-band optical system can be realized. Suitable for. The correction of the directional deviation is performed in the same manner as in the first embodiment.

[0013]

As described above, according to the present invention, it is possible to correct on-board the directional deviation of the optical system caused by the attitude fluctuation of the spacecraft and the temperature distribution difference,
Further, the size can be reduced by disposing the parallel plane transmission glass at a position where the light beam on the optical path is narrowed. In the case of a multi-band optical system, by disposing the glass immediately before each image sensor, the distance between bands can be reduced. There is an effect that the deviation can be corrected.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration and a principle of a main part of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a main part of a second embodiment of the present invention.

FIG. 3 is a perspective view showing an attached state of the parallel plane transmission glass and the linear actuator of the first and second embodiments.

FIG. 4 is a diagram showing a configuration and a principle of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parallel plane transmission glass 2 Linear actuator 3 Condensing means 4, 5, 8, 9 Optical axis 6 Image sensor 7 Reflecting mirror 10 Control means

Claims (2)

(57) [Claims] 1. A light collecting means including a lens system, a parallel plane transmitting glass disposed on an optical axis of the light collecting means and transmitting light, and supporting the periphery of the parallel plane transmitting glass and supporting the light of the glass. An optical device mounted on a spacecraft, comprising: a plurality of linear actuators for adjusting an angle with respect to an axis; and control means for calculating a correction amount and operating the linear actuator. 2. An image pickup device is arranged at a light condensing position on the optical axis, and the control means includes means for controlling an angle by the linear actuator so that an output signal of the image pickup device is maximized. 2. The optical device mounted on a spacecraft according to 1.