JPH09281888A - Phase projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly accurate reproduced image by adjusting the size of an outermost luminous flux reaching an original plate from a projection lens, with an optical operation, so as to make the size of a light shield for setting the shape of a chipping edge simply coincident with the size of a projected luminous flux, in a phase projector. SOLUTION: This projector includes a moving lens 6 which is moved along an optical axis, to enable a change in the size of the outermost luminous flux 11 reaching the original plate 4 from the projection lens 1, in a part of the optical system of the projection lens 1 and the moving lens 6 is positionally adjusted in an optical axial direction, to change the height of the optical path of the outermost luminous flux 11 and obtain an adjustment for coincidence with the radius of the light shield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a projector for projecting celestial bodies that cast shadows on light sources such as the moon, earth, planets, satellites, asteroids, and artificial celestial bodies of planetariums. The present invention relates to a phase projector having a phase changing device for performing the above.

[0002]

2. Description of the Related Art Conventionally, such a phase projector has been shown in FIG.
There are a transmission type as shown in FIG. 3 and a reflection type as shown in FIGS.

As a technique common to both, a phase changing device c is installed between an original plate b illuminated by an illumination system k and a projection lens a for projecting a picture on the original plate b.
As shown in FIG. 2 as a representative, the phase changing device c includes a rotation mechanism d formed by a motor M and gears for creating a cycle of the phases of the moon, that is, a phase, and an optical axis engaged with the rotation mechanism d. It is composed of a shading member f rotatably attached (creating the shape of the undulations) to an axis e orthogonal to the.

Further, the positional relationship among the projection lens a, the original plate b, and the light shield f is such that when the original plate b is placed at the focus position of the projection lens a, the position of the light shield f is within an allowable range (focus depth) in focus. Need to be installed in.

Further, in the transmission type projector as shown in FIG. 2, the projection lens a and the original plate b are set within the permissible range (depth of focus) of the projection lens a (light of the phase device). By means of the light shield f (mounted on the shaft), FIG.
As shown in (a) of Fig. 2, the light beam g is not blocked, and the whole or a part of the light beam g is blocked from the state shown in Fig. 2 (b) and Fig. 2 (c). Was making a phase image of. (A) is a full moon state, (b) is a new moon state, and (c) is a state in which the moon is lacking to an appropriate degree.

There are two types of reflection type projectors as shown in FIGS. The one shown in FIG. 3 is constructed by bending the transmission type optical path as shown in FIG. 2 at the half mirror h portion, and the phase change device c is located at the optical path bending portion and passes through the half mirror h. The projected light flux of the picture of b is again reflected toward the half mirror h and transmitted therethrough,
A reflecting mirror i that is directed toward the projection lens a and a light shield f that rotates around this reflecting mirror i are provided. By rotating the light shield f, various light beams reflected from the reflecting mirror i are shielded, so that the image is projected. Phase change is applied to the image,
(C) Make a sleight of mind.

FIG. 4 shows a projection lens a and an illumination system k.
The optical path between and is bent at the half mirror h portion, and the phase change device c is illuminated by the illumination light flux from the illumination system k that has a picture drawn on the reflecting mirror and has passed through the half mirror h. An original plate b and a light shield f that rotates around the original plate b are provided, and variously shield the reflected light beam that the illumination light beam reaches the original plate b, reflects, and travels toward the half mirror h by rotating the light shield f. As a result, the reflected light flux enters the projection lens a and changes the phase of the projected image, thereby causing the disappointment as described in (a) to (c) above.

[0008]

However, in the conventional phase projector shown in FIGS. 2 to 4, in the phase change device c installed between the projection lens a and the original plate b, the axis e orthogonal to the optical axis is used. Although the light shield f attached to the light shields the light flux in various ways, the shape at the time of the lacking of the image is dependent on whether the light shield f and the light flux g from the projection lens a to the original plate b have the same size. Affect. For example, (d) and (e) of FIG.
If the light shield f is larger than the light beam g as shown in (3), the sharp tip shape of the crescent moon cannot be reproduced. In order for the shape at the time of chipping to be proper, the sizes of the light shield f and the light flux g must match.

Since the light beam g is convergent light on the side of the original plate b, if the light shield f is moved in the optical axis direction, a state in which the light shield f and the light beam g have the same size should be easily obtained. Is.

However, in practice, the light shield f is installed at the center of the rotation mechanism of the phase change device c, and it is difficult to move it in the direction along the optical axis. While viewing the projected image, the light shield f itself is additionally processed so as to match the size of the light flux g, or the light shield f of several sizes is prepared, and a trial projection using these is performed. Are sequentially performed to search for and use the light shield f having the same size as the light flux g. Therefore, it takes time to satisfy the appropriate conditions and it is troublesome.

On the other hand, in the reflection type projector having the structure as shown in FIGS. 3 and 4, with respect to the reflecting mirror i or the original plate b on which a picture is drawn, the reflecting mirror i and the original plate b are rotated. Since the light shield f cannot be installed unless the light shield f is larger, it is possible in principle to match the size of the light flux g with the size of the light shield f regardless of the difference in the specific form. Can not. In short, a small circle (original plate) is covered with a light shield f having a large radius, and there is a problem that a thin moon cannot be reproduced with high accuracy.

An object of the present invention is, in a projector having a phase changing device for producing a phase difference, a light-shielding element which determines the shape at the time of chipping by optically controlling the size of the outermost light flux from the projection lens to the original plate. Is to simply match the size of the projection light beam with the size of the projected light flux so that a highly accurate reproduced image can be obtained.

[0013]

In order to achieve the above-mentioned object, the phase projector according to the invention of claim 1 is projected between an original plate and a projection lens for projecting an image of the original plate. In a phase projector that is equipped with a phase changing device that causes the image to be distracted, the projection lens moves to a part of its optical system along the optical axis, and the size of the outermost light flux from the projection lens to the original plate is increased. It is characterized by including a movable lens whose height can be changed.

In such a structure, the light shield rotatably attached to the axis orthogonal to the optical axis of the phase change device is rotated between the projection lens and the original plate to reach from the projection lens to the original plate. Converging light is blocked according to the rotation position,
The original image projected by the projection lens can be disappointed. In particular, when a part of the moving lens of the optical system of the projection lens is moved along the optical axis, the size of the outermost luminous flux of the converged light from the projection lens to the original plate changes, so that the moving lens is moved in the optical axis direction. The height of the optical path of the outermost light flux of the convergent light can be adjusted by a simple optical operation to adjust the position so as to match the radius of the light shield to be used, whereby the size of the convergent light and the light shield can be reduced in a short time. It can be matched and reproduced with high precision even on a thin moon. In addition, the structure does not become particularly complicated, and the cost is less than that in the case of spending a great deal of labor and time in the past.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Representative embodiments of the present invention will be described in detail below with reference to the drawings.

The first embodiment is a transmission type phase projector and is used for a moon projector and the like. As shown in the overall schematic structure of FIG. 1, this phase projector has an original plate 4 illuminated from the back by an illumination system 5, and transmitted light from the original plate 4 enters a projection lens 1 and forms an image on a dome screen (not shown). Is
The picture on the master 4 is projected. When the master 4 is sequentially switched and used by a general multi-frame switching mechanism (not shown), the phase projector becomes a versatile one capable of projecting objects other than the moon.

The projection lens 1 moves the focusing system 7 in the optical axis direction to perform focusing in accordance with the difference in projection distance. The illumination system 5 has condenser lenses 8 and 9 and the like, and uniformly illuminates the original plate 4 at the projection position with light from the light source lamp L.

Between the projection lens 1 and the original plate 4, there is provided a phase changing device 3 for giving a phase change to the projected image to realize the desired state.
The light shield 2 as known from Japanese Patent No. 5021 is rotated at a constant rate. As shown in FIG. 1, the light shield 2 is rotatably engaged with an axis 2a orthogonal to the optical axis in the phase change device 3 and includes a rotation mechanism 10 including a motor M and a gear.
Is driven to rotate. The shading member 2 determines the projected image of the picture on the original plate 4 depending on its rotation position, that is, the shape at the time of making the phase go through.

Such a sloppy operation by the phase changing device 3 is used, for example, for the production of the phases of the moon in the planetarium, and depending on the rotation position of the light shield 2, as shown in FIG. A full moon projection state in which all the convergent light 11 toward 4 passes, and a new moon projection state in which all the convergent light 11 is blocked as shown in FIG.
As shown in (c) of FIG. 1, it is possible to project a state in which the moon that blocks a part of the convergent light 11 lacks various degrees.

By the way, in order to carry out such a despair with high accuracy and reproducibility, the sizes of the convergent light 11 and the light shield 2, that is, the diameters of both, are (a) to (c) in FIG. ) It is necessary that they agree with each other.

In order to satisfy this, in the present embodiment, the convergent light 11 from the projection lens 1 to the original plate 4 is moved to the projection lens 1 and a part of its optical system along the optical axis. A moving lens 6 capable of changing the size of the outermost luminous flux is provided.

Although the movable lens 6 is shown as a single lens,
Any structure may be adopted as long as it has the above-mentioned functions. Further, the configuration of the projection lens 1 itself can be freely designed in terms of the number of lens groups, the number of lenses, the type of lens used, etc., and any other function can be provided as long as the above function is not impaired. Good.

When the movable lens 6 provided in a part of the optical system of the projection lens 1 is moved along the optical axis, the size of the outermost light flux of the converged light 11 from the projection lens 1 to the original plate 4, that is, the diameter. Therefore, the height of the optical path of the outermost light flux of the convergent light 11 can be adjusted to match the radius of the light shield 2 used by a simple optical operation for adjusting the position of the movable lens 6 in the optical axis direction. Thus, the sizes of the convergent light 11 and the light shield 2 can be matched in a short time as shown in FIGS. 1A to 1C, and even a thin crescent moon having a sharp tip can be reproduced with high accuracy.

As with the conventional focusing system 7, the moving lens 6 adopts a simple coupling structure in which a cam ring (not shown) that is externally operated and a cam groove and a pin are engaged.
By operating this cam ring from the outside, the lens 6 can be moved in the optical axis direction, and the necessary adjustment can be performed easily and in a short time.

In short, the structure is not particularly complicated,
It is less costly than in the conventional case where a great deal of time and labor is required.

Although not shown, even in the reflection type phase projector, the light shield is separated from the original plate and is arranged between the original plate and the projection lens, so as in the case of the above-described embodiment.
By changing the size of the outermost luminous flux from the projection lens to the original plate,
The sizes of the light shield and the projected light flux can be matched, and this also belongs to the category of the present invention.

[0027]

According to the phase projector of the present invention, the optical path of the outermost light flux of the convergent light can be controlled by a simple optical operation for adjusting the position of a moving lens in the optical system of the projection lens in the optical axis direction. The height can be adjusted to match the radius of the light shield to be used, so that the sizes of the converged light and the light shield can be matched in a short time, and the light can be reproduced with high precision even in a thin moon. Moreover, the structure does not become particularly complicated, and the cost is lower than that in the case where a lot of labor and time are required as in the conventional case.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a transmission type phase projector showing a typical embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a conventional transmission type phase projector.

FIG. 3 is an overall configuration diagram showing a conventional reflection type phase projector.

FIG. 4 is an overall configuration diagram showing another type of conventional reflection type phase projector.

[Explanation of symbols]

 1 Projection Lens 2 Light Shield 3 Phase Change Device 4 Original Plate 5 Illumination System 6 Moving Lens

Claims (1)

[Claims] 1. A phase projector comprising a master and a projection lens for projecting an image of the master, provided with a phase change device for distracting the projected image, wherein the projection lens is a part of its optical system. In addition, the phase projector including a moving lens capable of changing the size of the outermost light flux from the projection lens to the original plate by moving along the optical axis.