JP3088120U - Parallel type rear projection type projector device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a rear projection type projector device to be installed even in a limited space.
The overall device is thinned and a large image display area is obtained. SOLUTION: Projection means 1a and 1b, a plane mirror 2 and a transmission type screen 3 are attached to a frame 4 of a rear projection type projector device with a distance and an angle between them set, and a plurality of sets of image projection units are used for continuous. Display an image.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a rear projection type projector device.

[0002]

[Prior art]

 In the field of projector devices, rear projection type projector devices that have established themselves as a single image display system through the development of liquid crystal projectors, transmissive screens, and lenses have been recently proposed in many cases.

[0003] In particular, rear-projection projectors have been actively developed. However, projector display devices require a certain distance between a projection unit that projects an image and a screen that receives an image. On the other hand, there is a problem that it is not easy to reduce the size of the device, and it is not easy to reduce the thickness of the device.

[0004] One is a method using a conversion lens, which is a magnifying lens. The conversion lens is provided between an image projection unit of a projector and a front transmission screen to increase a ratio of enlarging an image, thereby increasing a ratio between the projector and the projector. The aim is to reduce the thickness by shortening the space between transmission screens.

[0005] There is another means for shortening the linear distance between the projector and the transmission screen by arranging a plane mirror between the projector and the transmission screen and reflecting the image light beam by the plane mirror.

[0006] Furthermore, there is a means for using a convex mirror instead of a plane mirror to enlarge an image larger in a short distance and to shorten a distance between a projector and a transmission screen.

[0007] Furthermore, a means of realizing a more effective thinner by using a conversion lens, a plane mirror, a convex mirror, or a combination of the respective means is also conceivable.

[0008] In addition, when the projection light emitted from the projector is projected on a screen to display an image, the periphery of the image has a defect on the image (the image is missing, the image is not clear, the image is not clear). (Colors are not natural or have unevenness.) It is often the case that the defect around the image is hidden to show only the effective part of the image. Therefore, the effective part is set by restricting it to a specific direction. Sometimes the size is reduced.

[0009]

[Problems to be solved by the invention]

 However, when a conversion lens is used, a large lens is inevitably needed because the image light projected from the projector is enlarged and diffused on the way, and the conversion lens becomes larger and more expensive. Is an issue. In other words, it becomes a factor that hinders the reduction in the overall thickness of the device, and furthermore, the entire system becomes an expensive device. Therefore, it can be said that it is not easy to achieve the reduction in thickness only with a conversion lens.

In the case where a flat mirror is used to reflect an image to reduce the thickness, the problem that the whole system becomes expensive is solved, but it is difficult to display the image in a large scale over a short distance, and the thickness is reduced. Difficult.

Further, in the case of realizing a thin type by reflecting an image using a convex mirror, the problem that the whole system becomes expensive is solved, but the curvature of the convex mirror is obtained, and the projection means for projecting the image and the transmission means for receiving the image are used. There is a problem that it is difficult to accurately determine the position of the mold screen and the convex mirror and to focus on the screen, and it is not easy to perform maintenance such as maintenance. Another problem is that it is not easy to manufacture a precise convex mirror.

[0012] Commercially available projector devices are equipped with various correction functions such as a function of correcting a trapezoidal image projected on a screen (trapezoidal correction). By performing the correction, the image display area is reduced. It is important not to use the correction function as much as possible, as it will be much smaller.

An object of the present invention is to provide a projector device which is easy to construct a system, has a small set size, is thin, and has a large image display area in view of the above points.

[0014]

[Means for Solving the Problems]

 In order to solve the above problems, a plurality of sets of image projection units arranged in parallel, a plane mirror for reflecting image light rays, and a transmission type provided to project an image projected by the image projection units are provided. With a screen, a plane mirror and a screen are arranged on a single frame with a fixed distance between them. And a rear projection type projector device characterized by displaying an image.

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a system configuration example of a rear projection type projector device to which the present invention is applied. This embodiment is a rear projection type projector device provided with two projection units. The projection unit 1a and the projection unit 1b, the plane mirror 2 and the transmission type screen 3 are provided on one frame 4 and a sub-frame 5, and between them. The distance and the angle are determined. The frame 4 is housed in a housing of the rear projection type projector device.

The projection means 1 a and 1 b are fixed to a sub-frame 5 attached to the frame 4, and the adjusters of the sub-frame 5 enable parallel sliding of the respective attachment positions of the projection means 1 a and 1 b. By finely adjusting the position in parallel, the image displayed on the transmissive screen 3 is made continuous without any gap or overlap. The mounting angle between the frame 4 and the sub-frame 5 is also adjustable. Parts corresponding to the projection means 1a and 1b are denoted by the same reference numerals as the projection means 1, and detailed description thereof will be omitted.

The plane mirror 2 is arranged so as to have an optimum inclination angle calculated in advance in consideration of the positional relationship between the transmission screen 3 attached to the frame 4 and the projection direction of the image light beam by the projection means 1. And the mounting angle is adjustable. Although two projection means are incorporated, the plane mirror 2 is desirably a single mirror for the purpose of facilitating maintenance such as adjustment of an angle.

The projection unit 1 is equipped with all necessary devices as a projector. For example, a projection lens that combines three R, G, and B LCDs (Liquid Crystal Display) as main components to project a high-quality image, and an optical imaging device including the projection lens are provided. And a light source unit. It goes without saying that the projection means 1 may be of any type as long as it is small and plays the role of a projector.

A projection lens 5 is provided in front of the projection means 1, and the angle of view of the image light rays emitted from the projection means 1 is expanded to some extent by the projection lens 5, and the image light rays are reflected by the plane mirror 2. Thus, an image is accurately projected on the transmission screen 3. The transmissive screen 3 receives image light from the back and views the image projected on the transmissive screen 3 from the front.

The image light beam projected from the projection means 1 is reflected by the plane mirror 2 to invert the image, and the inverted image is projected onto the transmissive screen 3 from the back, and therefore, the image is projected from the front of the projection screen. When viewed, the image is not inverted and a correct image is obtained.

The screen display area obtained by the above means uses two projection means having a length: width ratio of 3: 4 in parallel, so that the length: width ratio is 3: 8, which is equivalent to 65 inches. In order to realize the display area, the entire device could be realized with a depth of 450 mm. As the projection means, those with high brightness are used because they are used outdoors. If luminance is not a concern, it is possible to reduce the set size by using a more compact projection means.

In the present embodiment, a case has been described in which two projectors are arranged adjacent to each other in the horizontal direction. However, it goes without saying that the number of projectors in the horizontal direction may be arbitrarily configured. In the vertical direction, two vertical rows can be arranged. For example, a three-screen multi-screen projection device arranged in three rows and one column, or a ten-screen multi-screen rear projection device arranged in five rows and two columns may be used. Needless to say, the array may be configured by changing the horizontal and vertical directions by 90 degrees as it is.

[0024]

[Effect of the invention]

 The present invention is embodied in the form described above and has the following effects.

It is possible to enlarge the image display while keeping the set size small, and it is expected that the range of the place where the rear projection type projector device is installed and the use thereof are expanded.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a system configuration of a rear projection type projector device to which the present invention is applied.

[Explanation of symbols]

 1a, 1b Projecting means 2 Plane mirror 3 Transmissive screen 4 Frame 5 Subframe

Claims (1)

[Utility model registration claims] 1. A system comprising: a plurality of sets of image projection units arranged in parallel; a plane mirror reflecting image light rays; and a transmission screen provided to project an image projected by the image projection units. Planar mirrors and screens are arranged on a single frame with a fixed distance between them, and a continuous image is displayed by a plurality of sets of image projection units while keeping the set size small and making the entire device thin. Rear projection type projector device.