JPH0619550A - Position adjusting device and its fixing method - Google Patents

Abstract

PURPOSE:To provide the image pickup element position adjusting device which exerts no influence on an image pickup element at the time of operation and tightly fixes the image pickup element even in a non-operation state by correcting the position shift of the image pickup element and an error in observation direction due to vibration. etc., in space. CONSTITUTION:A magnetic material is used for an image pickup element fitting member 1 and attracted by plural electromagnets 3 and 4 arranged on an external frame 2 to adjust the position of the image pickup element 5, the external frame 2 and image pickup fitting member 1 are connected by a coil spring 6, and when the attractive forces of the electromagnets 3 and 4 do not operate, the image pickup element fitting member 1 is supported by the coil spring 6; and projecting and recessing parts which engage each other are provided on the contact surfaces of the image pickup element fitting member 1 and external frame 2 and when the image pickup element fixing member 1 is fixed, the image pickup element fitting member 1 is brought into contact with the external frame 2 and fixed with the attractive forces of the electromagnets 3 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to position control of an image pickup device and the like, and more particularly to a device for controlling the position of the image pickup device which is a constituent element of an optical image pickup device mounted on a spacecraft such as an artificial satellite for use. Regarding

[0002]

2. Description of the Related Art In a space-borne optical sensor, an image pickup device is fixed, and its position is not adjusted in outer space.

As a device, a focus position adjusting mechanism for controlling the position of the image pickup device by a piezoelectric element has been proposed. Further, there has been proposed a focus position adjusting mechanism shown in FIG. 4 in which the position of the image pickup device is controlled by a voice coil type linear motor.

[0004]

When the image pickup device is fixed, the alignment error of the image pickup device on the ground cannot be corrected, and the mechanical environment added to the optical system at the time of launch of vibrations or the temperature in space. Since it was not possible to guarantee a slight shift due to the conditions, we had no choice but to rely on software-based measures such as image correction on the ground after data acquisition.

Further, in the control of the image pickup device by the piezoelectric element, the adjustment stroke is limited in the method using expansion and contraction of the piezoelectric element itself. Although the expansion and contraction of the piezoelectric element can be expanded by the principle of this, there is a problem that not only the mechanism becomes complicated, but also the rigidity becomes unstable and unstable. Further, since the existing piezoelectric element itself is relatively large, it has been difficult to cope with miniaturization.

The control of the image pickup device by the voice coil type linear motor has a problem that the temperature of the image pickup device rises due to heat generation of the coil. Further, there is a problem that the position of the image pickup device becomes indefinite due to the failure of the motor because it is completely non-contact.

Further, in the control of the image pickup device by the piezoelectric element or the voice coil type linear motor, it is difficult to hold and fix the image pickup device in a harsh mechanical environment such as vibration at the time of launch, and a separate locking mechanism is required. There is a problem.

An object of the present invention is to provide a position adjusting mechanism which corrects an alignment error of an image sensor or the like in space and a position shift due to temperature conditions, and an error in an observation direction due to a vibration of a satellite or the like. is there. The position adjustment device and its fixing can be fixed without using an additional mechanism even in the harsh mechanical environment at the time of launch, even when the position adjustment device is not affected by heat even if the actuator is not operating. To provide a method.

[0009]

The position adjusting device of the present invention comprises a mounting member for mounting an object using a magnetic material, an outer frame, and the mounting member arranged in the outer frame with a gap therebetween. It is characterized by comprising a plurality of electromagnets for attracting a magnetic force to adjust the position. Further, in the above position adjusting device, the outer frame and the mounting member are connected by an elastic member supporting the mounting member. Further, in the above position adjusting device, the contact surface between the mounting member and the outer frame is provided with concaves and convexes that fit into each other. Further, in the fixing method of the position adjusting device, the attaching member is brought into contact with the outer frame by the attracting force of the electromagnet and is fixed.

[0010]

In the present invention, a magnetic material is used for the mounting member,
The position is adjusted by attracting with a plurality of electromagnets arranged on the outer frame. For one translational degree of freedom, the electromagnets are arranged on the outer frame portions on both sides in the translational direction so as to face each other with the mounting member sandwiched therebetween, and the mounting member is attracted by magnetic force, which is obtained by a position sensor or the like. Positioning adjustment is performed based on the position data of the mounting member. The position adjustment is similarly performed for other translational degrees of freedom. Regarding the rotational degree of freedom, positioning adjustment is performed in the same manner as translation by using an electromagnet used for translational position adjustment or an electromagnet separately.

The outer frame and the mounting member are connected by an elastic member such as a metal plate spring, a coil spring, or elastic rubber, and the elastic member supports the mounting member when there is no attraction force by the electromagnet.

In a severe mechanical environment such as launching, the mounting member is brought into contact with the outer frame and fixed by the attraction force of a part of the position adjusting electromagnet.

By providing the contact surfaces of the mounting member and the outer frame with the concavities and convexities that fit into each other at the time of contact fixing, it is possible to realize a strong fixing that is not displaced even by impact, vibration or the like. This makes it possible to correct misalignment due to alignment errors and temperature conditions in outer space, and to correct errors in the observation direction due to satellite vibration, etc., and the operation of the position adjustment device does not have the effect of heat. A position adjusting device that is fixed even when the actuator is not operating and that can be fixed even in a harsh mechanical environment at launch without using an additional mechanism is realized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is used for position adjustment of an image sensor will be described below with reference to the drawings. FIG. 1 is a top view of this embodiment, in which a part of the top surface of the outer frame 2 is cut to show the inside. An electromagnet a is provided on the side surface of the outer frame 2 shown by hatching.
A total of 6 of 3 are attached. Outer frame 2 that has been cut
Four electromagnets b4 are attached to the upper surface, and the electromagnet c7 is also attached to the lower surface of the outer frame 2 which is hidden in this figure with the image pickup element mounting member 1 sandwiched at a position facing the electromagnets b4.
4 are attached. The image pickup device 5 is attached to the image pickup device mounting member 1 made of a magnetic material, and the image pickup device mounting member 1 is attracted by a total of 14 facing electromagnets, and the current flowing to each electromagnet is controlled according to the position and speed. The position is controlled accordingly. In addition, the image sensor mounting member 1
Is connected to the outer frame 2 by the coil spring 6 and holds the position of the image sensor mounting member 1 when the electromagnet does not work.

FIG. 2 is a sectional view of the image pickup element position adjusting apparatus of FIG. A concave portion 10 is provided on the lower surface of the image sensor mounting member 1, and a convex portion 20 that fits into the concave portion 10 is provided on the lower surface of the outer frame 2.

FIG. 3 is a sectional view of the image pickup device position adjusting device of FIG. By energizing only the electromagnet c7, as shown in FIG.
It is possible to prevent an accident such that the image pickup device mounting member 1 is moved, collided and damaged due to the interference of the image pickup device and the impact force at the time of launching.

The number and arrangement of electromagnets may be changed according to the required performance and shape. As for the spring, a coil spring is used in this embodiment, but a leaf spring or
An elastic member such as rubber may be used, and the shape and number can be changed. It is not necessary that all of the image pickup element mounting member is made of a magnetic material, and it is possible to make only a portion facing the electromagnet and generating an attractive force a magnetic material. In this embodiment, two concave and convex portions are shown, but it is also possible to provide them on another surface or to make the shape complicated to increase the fixing force.

[0018]

The advantages of the present invention are as follows. That is, it is possible to correct the alignment error of the image pickup device in the outer space and the deviation due to the temperature condition, and to correct the error in the observation direction due to the vibration of the satellite. Further, the operation of the position adjusting device does not affect the image pickup element due to heat.
Further, even in a harsh mechanical environment at the time of launch, where the image sensor can be fixed when the actuator is not operating, the image sensor can be fixed without using an additional mechanism.

The present invention is not limited to the image pickup device and can be used for position adjustment of a laser used for intersatellite communication.

[Brief description of drawings]

FIG. 1 is a top view of an embodiment of the present invention.

2 is a cross-sectional view of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view when the fixing mechanism is operated in FIG.

FIG. 4 is a diagram of a conventional example in which the position of an image sensor is controlled by a voice coil type linear motor.

[Explanation of symbols]

 1 Image Sensor Mounting Member 2 Outer Frame 3 Electromagnet a 4 Electromagnet b 5 Image Sensor 6 Coil Spring 7 Electromagnet c 10 Recess 20 Convex

Claims (4)

[Claims] 1. A plurality of mounting members for mounting an object using a magnetic material, an outer frame, and a plurality of mounting members arranged in the outer frame with a gap between the mounting members to attract the members by magnetic force for position adjustment. A position adjusting device comprising an electromagnet. 2. The position adjusting device according to claim 1, wherein the outer frame and the mounting member are connected by an elastic member that supports the mounting member. 3. The contact surface between the mounting member and the outer frame is provided with recesses and protrusions that fit into each other.
The position adjusting device described in. 4. The method for fixing a position adjusting device according to claim 1, wherein the attachment member is brought into contact with and fixed to the outer frame by the attraction force of the electromagnet.