JPH0395538A - Projector - Google Patents

Abstract

PURPOSE:To project an image, which is not distorted in a vertical direction and/or horizontal direction, in an arbitrary position on a screen by means of a simple adjustment by fitting a reflecting mirror to a projector main body so that its inclination can be adjusted, and adjusting the inclination of the projector main body by means of an inclination adjusting means. CONSTITUTION:The bottom member 8 of the projector main body 1 is provided with four legs 9a-9d whose length can be independently adjusted; the reflecting mirror 6 is fitted to the projector main body 1 so that its inclination psi can be adjusted. A material is placed on a stage 7, and a light source 2 is lit; luminous flux from the light source 2 passes through the material 4, and the material 4 is projected on the vertical screen 18 via a projecting lens 5 and the reflecting mirror 6. At this time, the image free from distortion can be projected in an arbitrary, desired position on the vertical screen 18 by simply adjusting the length of the legs 9a-9d and also adjusting the angle psi of the reflecting mirror 6 so as to correspond with the adjustment of the length.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projector that is used in the field of projection and the like and projects an image onto a vertical screen.

[Conventional technology]

A conventional general projector, as shown in Fig. 4(a),
It has a projector main body 21, a projection lens 25, and a reflecting mirror 26, and a light source 22 and a Fresnel lens 23 are provided inside the projector main body 21. In a projector with such a structure, when a document (transparency) 24 is placed on the stage 27 of the projector main body 21, light from the light source 22 passes through the Fresnel lens 23 and then through the document 24.
The light reaches the screen 28 through the projection lens 25 and the reflecting mirror 26, so that the image of the material 24 can be projected onto the screen 28. By the way, when using this type of projector, the angle of the reflecting mirror 26 is generally adjusted so that many people can see the image on the screen 28 without being obstructed by the position of the user of the projector. Change as appropriate,
The image was projected at a higher position on the screen 28. However, when the screen 28 is positioned vertically and an image is projected at a higher position on the screen 28, the image on the screen 28 is As shown in Figure 4(b), the image is distorted in the vertical direction, making it difficult to see.

In order to project an image at an easily viewable position above a vertical screen without distortion in the vertical direction, for example, Utility Model No. 5116754, Utility Model No. 53-3, 922-5, Utility Model Number 53-5.
Projectors have been devised, such as that disclosed in No. 0433.

In the projector disclosed in Utility Model Publication No. 51-16754, the light source 1
2 is shifted in the X direction with respect to the light source position shown in FIG.
The light is made to enter the material 24, the projection lens 25, and the reflecting mirror 26 obliquely.

Furthermore, in the projector disclosed in Utility Model Publication No. 53-39225, the stage 27 on which the material 24 is placed is inclined with respect to the horizontal plane, that is, with respect to the horizontal arrangement of the light source 22 and the Fresnel lens 23, and the projection lens 25 is mounted on the stage. The mirror 26 is positioned parallel to the projector 27, and the reflecting mirror 26 is made separate from the projector and used by hanging it from a ceiling or the like.

Furthermore, the projector disclosed in Utility Model Publication No. 53-50443 has a reflector 26 that is separate from the projector, and is similar to the above-mentioned projector in that it is used by suspending it from a ceiling or the like. In the machine, the light beam from the light source 22 or the horizontal stage 27
A light source 22 and a Fresnel lens 23 are arranged so that the light is incident at an angle to
are arranged offset in the X direction.

[Invention or problem to be solved]

'' In each of the two conventional projectors, by shifting the relative positional relationship and inclination relationship between the light source and the stage with respect to the Yang Kai shown in FIG. E An undistorted image can be projected downward.

However, since the relative positional relationship and inclination relationship between the light source and the stage are set in advance, each of the above-mentioned projectors projects an image without distortion in the vertical direction only onto a certain narrow range of positions on the screen 28. However, there was a drawback in that it was not possible to easily project an undistorted image at any desired position. For example, in the projectors of Utility Model No. 5339225 and Utility Model No. 5 3-5 0 4 3 3,
When attempting to project an image without distortion in the vertical direction at any desired position, the vertical and horizontal positions and inclinations of the reflecting mirror 26 suspended from the ceiling etc. must be adjusted each time. However, the adjustment work is complicated, and it can only be used in specific locations where the height of the ceiling is suitable for working. Furthermore, in these conventional projectors, the image shown in FIG. 4(c). It is not configured to eliminate image distortion including in the left and right directions as shown in (d).

INDUSTRIAL APPLICABILITY The present invention can be used at any location, and can project an image without distortion in the vertical and/or horizontal directions at any desired position on the screen with simple adjustment. The purpose is to provide a projector.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a projector main body and a reflecting mirror attached to the projector main body so that the inclination can be adjusted, and the projector main body has a reflector that is attached to the projector main body so as to adjust the inclination of the projector main body. This device is characterized by being provided with an inclination adjustment means.

[Effect]

In the projector configured as described above, the inclination of the projector body is adjusted by the inclination adjusting means, and the inclination of the reflecting mirror is adjusted accordingly. This allows an undistorted image to be projected onto any desired position on the vertical screen.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1(a) is a block diagram of an embodiment of a projector according to the present invention.

Referring to FIG. 1(a), the projector of this embodiment has a projector main body 1, a projection lens 5, and a reflecting mirror 6. Inside the projector main body 1, a light source 2 and a , a Fresnel lens 3, and a stage 7 on which a material 4 is placed is provided on the projector body 1. Light source 2, Fresnel lens 3
The stage 7 and the projection lens 5 are positioned parallel to each other as in the structure shown in FIG. As shown in the figure, there are four legs 9a, 9b, 9c, and 9d whose heights can be independently and arbitrarily adjusted, and the reflector 6 is attached to the projector body 1 so that its inclination ψ can be adjusted. It is being Furthermore, as shown in the longitudinal section in FIGS. 3(a) and 3(b), four corners of the stage 75 6 are provided with ribs to prevent the material 4 from slipping off the stage 7 and to hold the material 4 in a predetermined position. width or 3~5a
A protruding member 10 with a height of about n and a height of about 5 IIlm is attached to a shaft 11.
It is rotatable around the . In addition, Fig. 3(a)
3(b) shows a state in which the protrusion member 10 protrudes from the stage 7, and FIG.
It shows how it is stored inside.

Next, the operation of the projector having such a structure will be explained.

When trying to project an image without distortion in the vertical direction onto an easily visible position above the screen 18, four legs 9a and 9b are used.
, 9c, and 9d, the heights of the legs 9a and 9b of the screen 18 are adjusted, and the legs 9a9b are held at a predetermined height with fixing screws, etc., and the entire projector is set at a predetermined angle θ with respect to the horizontal plane.
Tilt by 1. In accordance with this angle θ1, the inclination of the reflecting mirror 6 installed above the projector is adjusted so that it forms a predetermined angle ψ. In this state, when the material (transparency) 4 is placed on the stage 7 and the light source 2 is turned on, the light beam from the light source 2 passes through the material 4 via the Fresnel lens 3, the stage 7, and the projection lens 5.
It is projected as an image onto a vertical screen 18 via a reflecting mirror 6. At this time, the entire projector is at an angle θ with respect to the horizontal plane.
1, and the angle ψ of the reflecting mirror 6 is adjusted according to this angle θ1.
If it is set to an appropriate value, the image is projected onto the screen 18 at an easily visible position above the screen 18 without distortion in the vertical direction, as shown in FIG. 1(b). By the way, with respect to the state shown in FIG. 1(a), the legs 9a and 9b are adjusted so that the height of the legs 9a and 9b becomes higher, the angle θ1 is further increased, and the angle ψ of the reflecting mirror 6 is adjusted accordingly. By appropriately adjusting , an image without distortion in the vertical direction can be projected further above the screen 18 . On the contrary, with respect to the state shown in FIG. 1(a), the legs 9a, 9b are lowered in height.
9b, decrease the angle θ1, and appropriately adjust the angle ψ of the reflecting mirror 6 accordingly, it is possible to project an image with no distortion in the vertical direction further downward on the screen 18.

In this way, in this embodiment, by simply adjusting the heights of the legs 9a and 9b and adjusting the angle ψ of the reflecting mirror 6 accordingly, the vertical screen l8 can be placed at any desired position in the vertical direction. It is possible to project an image without distortion.

Furthermore, in this embodiment, when the image on the screen 18 is also distorted in the horizontal direction as shown in FIGS. The legs 9a, 9b, 9c are arranged so that the heights of the legs 9d and 9d are different.
, 9d can be appropriately adjusted to tilt the entire projector at an angle θ2 as shown in FIG. 2, thereby eliminating horizontal distortion of the image.

Note that when the entire projector is tilted by adjusting the legs 9a, 9b, 9c, and 9d, the stage 7 is also tilted from the horizontal plane, and the material 4 placed thereon may slip. In order to prevent this, it is recommended that the projecting members 10 provided at the four corners of the stage 7 be made to project onto the stage 7 to hold the material 4.

However, normally, it is sufficient to protrude only the protruding members 10 at the lower inclined part, that is, at the two corners opposite to the screen 18, and the protruding members 1 at the two corners of the screen 181FI need to be protruded.
0 may be stored in the stage 7 as shown in FIG. 3(b). Particularly when the material 4 is in the form of a roll, the protrusion of the projection member 10 on the screen 18 side becomes an obstacle to bringing the material 4 into close contact with the stage 7. good.

In the above-described embodiment, the lower member 8 of the projector main body 1 has four legs 9a, 9b,
9c and 9d, or when the purpose is simply to project an image without vertical distortion onto any desired position on the screen 18, that is, for applications where it is not necessary to correct horizontal distortion of the image. In this case, it is sufficient to provide only the two leg portions 9a and 9b on the screen 18 side.

Furthermore, the present invention is applicable not only to the above-mentioned transmission type projector in which the light source 2 is positioned at the lower part of the projector body 1, but also to a reflection type projector 910 in which the light source 2 is positioned at the upper part of the projector body 1. I can do it.

〔Effect of the invention〕

As explained above, according to the present invention, the reflecting mirror is attached to the projector main body so that its inclination can be adjusted, and the projector main body is provided with an inclination adjusting means for adjusting the inclination, so that consideration is given to the ceiling, etc. It can be used at any location without any distortion, and by simple adjustment, an image without vertical and/or horizontal distortion can be projected at any desired position on the screen.

is a diagram showing an image that is also distorted in the left and right directions.

DESCRIPTION OF SYMBOLS 1...Projector body, 2...Light source, 3...Fresnel lens, 4...Document (1~Lance transparency), 5...Projection lens, 6...Reflector, 7...・Stage 8・・
・Lower member, 9a, 9b, 9c, 9d-leg, 10...
Projection member, 18...Screen, θ1, θ2...Inclination angle of projector body, ψ...Inclination angle of reflector

[Brief explanation of drawings]

Claims (1)

[Claims] The projector has a projector main body and a reflecting mirror attached to the projector main body so that its tilt can be adjusted, and the projector main body is provided with a tilt adjusting means for adjusting the tilt of the projector main body. A projector.