JP3009836B2 - concave mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulated visual field display device used for an operation training device for an aircraft, a ship, or the like, and relates to a concave mirror for enlarging an image on a screen, an image on a CRT, and the like to a far distance. .

[0002]

2. Description of the Related Art In a simulated view display device such as a flight simulator or a boat maneuvering simulator, a method of setting an image plane near a focal plane of a concave mirror is generally used in order to make a projection image on a screen or an image on a CRT into a distant image. It is a target. In this case, a large concave mirror is required. As a method of making this large concave mirror, there have been methods of joining concave mirrors made of a glass substrate or fixing the periphery of a thin sheet-like mirror, and forming the concave mirror by vacuum suction. In the case of a concave mirror made of glass, since it is large, it is heavy, and there are drawbacks such as a discontinuous mirror surface at the joint, and it is difficult to keep the shape constant in the case of a sheet mirror, When installed in a simulator, there are drawbacks such as slight shaking due to vibration during operation.

[0003] An example of the prior art will be described more specifically.
2. Description of the Related Art Conventionally, as a concave mirror used in a simulated visual field display device such as a flight simulator, a method of forming a concave surface by vacuum suction of a glass mirror or a sheet mirror is generally used.

The former concave mirror has the shape shown in FIG. 4 and has a radius of about 3 m, a height of about 2 m, and a width of about 6 m. (The depth varies depending on the field of view required by the simulator. °, about 3 m is required). In order to form such a large concave mirror, there is no other way than to connect a glass mirror in the case of a glass mirror due to limitations of mirror manufacturing equipment. For this reason, it was necessary to connect the divided glass mirrors as shown in FIG. In addition, the method of forming a concave surface by vacuum suction of a sheet-like film mirror is generally a method of detecting the shape or position of the film mirror and controlling the degree of vacuum to keep the shape of the concave surface constant. It is.

[0005]

In the above-mentioned prior art, in the case of a glass mirror, it is necessary to perform minute chamfering on the intersection line between the cut surface and the mirror surface in order to prevent breakage. This becomes a discontinuous portion of the mirror surface at the joint between the mirrors, and there is a disadvantage that the mirror is not an integral mirror. The sheet mirror does not have the above-mentioned disadvantages, but it is difficult to keep the concave shape constant, and the sheet mirror may be slightly distorted due to the vibration during the movement of the simulator, which has a bad influence on the reflected image. was there. An object of the present invention is to solve these drawbacks by minimizing the gap and sagging of the joint surfaces and improving the vibration resistance.

[0006]

In order to achieve the above object, the present invention provides a concave mirror having a larger spherical surface formed by joining a plurality of unit concave mirrors, wherein the unit concave mirror has a concave surface as a mirror surface, The joint surface of the unit concave mirror is formed such that an extension plane of the joint surface includes the spherical center of the concave mirror, and the unit concave mirror is joined at one point where the spherical surfaces of the unit concave mirrors are common to each other. Thus, they are directly connected.

Further, if necessary, the intersection line between the joint surface of the unit concave mirror and the mirror surface may not be chamfered. Further, the material of the concave mirror may be metal, or the back surface of the unit concave mirror may be bored.

As a result, the gap between the concave mirror coupling surfaces can be made inconspicuous in practical use, and the rigidity and strength of the concave mirror itself can be increased, so that a large coupled concave mirror having excellent vibration resistance can be obtained.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
4 will be described with reference to FIG.

FIG. 2 shows a concave mirror in which the spherical surface 5 is cut by a plane including the spherical center 0. Two planes 0a'a including spherical center 0
The spherical surface S is divided by a '', 0b'bb ''. Also, a plane 0 which forms the center of the two planes 0a'aa '' and 0bb'b ''
Plane a0b perpendicular to C'CC "and containing spherical center 0
And a'0b 'divide the spherical surface S. A concave mirror having the concave side of the spherical surface cut in this manner as a mirror surface. Similarly, the divided concave surface abb "a" is defined, and the spherical surface S is similarly set and cut in the horizontal direction. In other words, the joint surface of the unit concave mirror is formed such that the extension plane of the joint surface includes the spherical center of the concave mirror, and the unit concave mirror is joined at one point where the spherical surfaces of the unit concave mirrors are common to each other. It is made to become. The shape is set in this way, and a single concave mirror is manufactured.

FIG. 4 shows a state in which these unit concave mirrors 1 to 5 are connected to form a large mirror.

FIG. 1 shows a state in which the back surface of the mirror 1 is bored to reduce the weight of the mirror. This processing can be performed in a shape corresponding to the processing means, such as a circle, a rectangle, or a honeycomb shape.

FIG. 3 shows a cross section in a state where concave mirrors 1 to 5 are connected. The concave mirrors 1 to 5 are in contact with the cut surfaces 6 to 9 respectively. A coupling component 10 is attached to the concave mirrors 1 to 5 by screws 11. The coupling parts 10 are interconnected by screws 12, so that the concave mirrors 1 to 5 are integrated. Since the cut surfaces 6 to 9 (also joined surfaces) of the concave mirrors 1 to 5 are planes including a spherical center, the mirror surfaces are continuous with a uniform curvature. Line of intersection 13-1 between cutting plane 6-9 and mirror surface
Since there is no chamfering on 3 ''', only a fine line is formed on the mirror surface and there is no practical problem.

[0014]

According to the present invention, it is possible to realize a jointed large-sized concave mirror which has little noticeable gap, has sufficient vibration resistance and strength.

Further, as described above, since the extension plane of the joint surface of the unit concave mirror includes the spherical center of the large concave mirror, a large concave mirror can be formed by simply joining the joint surfaces during assembly. Further, the same type of unit concave mirrors can be used in a row. Further, in the unit concave mirror, since the angle formed by the bonding surface and the mirror surface is obtuse, it is difficult for the edge portion to be "chipped" or the like.In the manufacturing process or the maintenance process, the unit concave mirror can be pulled out rearward. Therefore, the replacement work or the like can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mirror showing one embodiment of the present invention.

FIG. 2 is a diagram showing a concept of division according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a state where a mirror according to an embodiment of the present invention is connected.

FIG. 4 is a conceptual diagram of a combined concave mirror;

[Explanation of symbols]

1-5 concave mirrors, 6-9 coupling surfaces of concave mirrors, 13,
13 ', 13'',13''' Minute gap between coupling mirrors

Claims (4)

(57) [Claims] 1. A concave mirror having a spherical surface formed by joining a plurality of unit concave mirrors to form a larger spherical surface, wherein the unit concave mirror is quadrangular, the concave surface is a mirror surface, and four sides of the unit concave mirror are bonded to each other. An extension plane of the joint surface is formed so as to include the spherical center of the concave mirror, and the unit concave mirrors are joined by directly joining the joint surfaces so that the spherical centers of the unit concave mirrors become one common point. A concave mirror characterized by being made of. 2. The concave mirror according to claim 1, wherein an intersection line between the joint surface of the unit concave mirror and the mirror surface is directly in contact with the mirror surface without chamfering. 3. The concave mirror according to claim 1, wherein said concave mirror is made of metal. 4. The concave mirror according to claim 3, wherein a back surface of the concave mirror is bored.