JPH0351355B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology provides a structure for a device that allows sick people in hospital beds to view magnified images projected on a liquid crystal television using the ceiling surface while lying down. Belongs to the technical field.

<Summary of the gist> Accordingly, in the present invention, a transparent original image panel such as a liquid crystal panel is provided at a predetermined position in front of a white light source provided on the base side, and furthermore, a transparent original image panel such as a liquid crystal panel is provided at a predetermined position in front of the light source such as a white light source provided on the base side. This invention relates to a device that is provided with a lens for projecting an enlarged image onto a screen, and in particular, a relatively tiltable mirror is interposed between a light source and a transparent original panel. A light source system and a reflection system are configured, and the light source system and reflection system before the mirror are bent by a relatively tiltable link mechanism, in the reflection system ahead of the mirror, Therefore, the transparent original panel and the lens are always parallel to the screen, and the optical axis of the transmitted light always passes through their center.
This invention relates to an image projection device that is linked to a kind of tilting mechanism.

<Prior art> As is well known, with the rise of the information society, televisions have come to be widely used in various fields, but conventional televisions are generally of the cathode ray tube type and the equipment is Because it is manufactured for personal use in a face-to-face format, it is quite heavy, and the screen is small and difficult to view.
For example, it is often painful for sick people to look at the screen in a normal position, and to deal with this, they can watch entertainment programs by projecting images onto the ceiling while lying on the hospital bed. is possible in principle, but CRT televisions are large and heavy, making it difficult to mount them directly on ceilings, etc., and so-called overhead type video projectors that use enlarged projection systems cannot In addition, in the case of a color TV, etc., the screen is dark because the reflected light rays are used, and in the case of a color TV, three devices are required to project the three primary colors of red, green, and blue, which is expensive and difficult to use as equipment. It was hot.

<Problems to be Solved by the Invention> In addition, general transmissive overhead type projectors such as slides have the disadvantage that the screen is distorted unless it is projected from a direction perpendicular to the screen on the wall. If multiple people are sitting at a table in a conference room, projecting from the side,
The problem was that the image was distorted, making it impossible to obtain accurate image projection, and that information could not be reliably conveyed to each person.

In addition, in recent years, LCD televisions suitable for commercial use have been put into practical use, but the screens are even smaller and the pixels are coarser, causing eye strain for sick and elderly people to stare directly at them for long periods of time. There were also other problems.

<Objective of the Invention> The object of the invention is to solve the problems of using the ceiling in a hospital room as a screen to project an image or projecting an image onto a wall screen in a conference hall based on the above-mentioned prior art. As a technical challenge, using a type of tilting mechanism to project a clear enlarged image onto a screen on a wall or ceiling without distortion through a liquid crystal panel parallel to the screen and a lens, a transparent original image panel such as a light liquid crystal panel can be projected. It is an object of the present invention to provide an excellent image projection device that can benefit the field of optical technology application in the information industry.

<Means/effects for solving the problem> In order to solve the above problem, the structure of the present invention, which is based on the scope of the above-mentioned claims, is as follows:
A transparent original image panel such as a liquid crystal panel is placed in front of the patient's bed or at a predetermined location in a conference hall, in a position that is easy for the viewer to view and does not interfere with the viewer, and is projected parallel to the original image. A lens is set parallel to the screen to be used, and the original image formed on the transparent original image panel is reflected by a white light source installed at the rear of the lens onto a total reflection mirror, and then projected onto the screen. Therefore, when setting the projection device at the desired position, always make sure that the transparent original panel and lens are parallel to the screen, and
The optical axis from the light source passes through the center of the transmission original panel and lens, and even when the light source system and reflection system are set at a desired angle with respect to the screen by a kind of link mechanism, the transmission does not interfere with the viewer. As mentioned above, the original image panel and lens are kept parallel to the screen, and a technical measure has been taken to use this as a kind of tilting mechanism to project an undistorted image onto the screen. .

<Example> Next, an example of the present invention will be described below based on the drawings.

The embodiment shown in FIG. 2 is an embodiment of the principle of the present invention, in which a total reflection mirror 3 provided in front of a white light source 1 via a condenser lens 2 is positioned at a predetermined position with respect to a fulcrum 4 provided at its center. It can be rotated and tilted, forms a reflection system 6 for the light source system 5, and serves as a transparent original image panel electrically connected to an image forming electronic device 7 that has been developed and made practical. The liquid crystal panel 8 and the lens 9 that projects an image onto the screen are linked to the mirror 3 by an appropriate tilting mechanism so that they are parallel to the screen regardless of the tilting of the mirror 3, and the optical axis 10
always passes through the center of the liquid crystal panel 8 and lens 9.

Therefore, regardless of whether the image formed on the liquid crystal panel 8 is a still image or a moving image, it is possible to always enlarge and project an undistorted image onto the screen using the tilting mechanism.

Furthermore, even when the viewer 11 is in front of the screen, the image can be accurately projected onto the screen from the side without distortion by the mirror 3 and the tilting mechanism without blocking the viewer's 11 field of view. become.

A specific example of the design of the above-mentioned tilting mechanism will be described with reference to FIGS. 4 and 5. For convenience of explanation, the mirror 3 is shown in a horizontal position in this example,
The frame 13 made of beam material of the light source system 5 and the frame 14 made of beam material of the reflection system 6 are relatively rotatable as a kind of link mechanism via pins 15, 15, and the device 12 as a tilting mechanism is It is designed to create a desired tilted posture,
A slider 16 is provided on a support shaft 17 that extends integrally with a pin 15 on the base end side of the total reflection mirror 3 interposed between the light source system 5 and the reflection system 6, and is movable up and down. Rack 1 provided on one side of the support shaft 17
By rotating a handle 19 integrated with the pinion 18 with respect to the pinion 18 provided on the slider 16 with respect to 7', the slider 16 can be vertically adjusted as desired on the support shaft 17.
As a result, the tilting mechanism device 12 becomes a kind of link mechanism and allows the relative angle, that is, inclination, of the light source system 5 and the reflection system 6 to be freely adjusted via the lower pin 15. The inclination angle of the mirror 3 can be halved.

In the reflection system 6, the liquid crystal panel 8, which serves as a transmission original panel, is pivotally supported by the pin 15 via the link 20, and is electrically connected to the image forming electronic device 7 as described above. The lens 9, which is pin-supported by a link 21 at the tip of the frame 14, is always in a parallel posture regardless of the inclination angle of the liquid crystal panel 8 and the tilting mechanism device 12, and both are always parallel to the screen (not shown). They are made to maintain their posture.

On the other hand, the light source 1 and condenser lens 2 of the relatively heavy light source system 5 are fixed to the frame 13 of the light source system 5, and the optical axis 10 is always aligned with the center point 4 of the mirror 3. Reflection system 6
As described above, the optical axis 10 of the optical axis 10 always automatically passes through the center of the liquid crystal panel 8 and the lens 9, regardless of the tilt angle of the tilting mechanism device 12.

Therefore, as shown in FIGS. 6 and 7, regardless of whether the relative crossing angle, that is, the inclination angle, of the tilting mechanism 12 is narrowed or widened, the light from the light source 1 is only half of the inclination angle. The rotational fulcrum 4 of the mirror 3 tilted at an angle is always used as a reflection point to automatically pass through the center of the liquid crystal panel 8 and lens 9, and the liquid crystal panel 8 and lens 9 are always automatically parallel to a screen (not shown). This means that you are trying to maintain your posture.

In the embodiment shown in FIG. 4, each frame 1
3 and 14 are covered with thin rubber shield covers 22 to block external light.

An example in which the above-mentioned configuration is actually applied will be described with reference to FIG. 1. This example is an application mode for a hospital room, and is installed next to the bedside of a sick person 24 who is lying on the bed in a hospital room 23. An image projecting device 12' having the tilting mechanism 12 is set on the table 25. The tilting mechanism 12 is as shown in the embodiment shown in FIG. As shown in FIG. 7, the relative inclination posture is set at a predetermined angle.

In this embodiment, in order to obtain a stable posture, the light source system 5 side is set horizontally parallel to the top surface of the table 25, and the patient 24 holds the handle 19 shown in FIG. 4 over his head. by extending and manipulating the frame 14 of the reflection system 6 to a desired angle with respect to the light source system 5 via the pin 15,
The image is projected onto a screen using the ceiling 26 by projecting light from a lens 9 and adjusted so that the image can be projected at the most easily visible position for the patient 24.

Then, the patient 24 presses a switch on the image projection device 12' while lying down, and the image forming electronic device 7 forms a color image on the liquid crystal panel 8, which has so far been completed. However, the light from the light source 1 is reflected by the mirror 3, passes through the liquid crystal panel 8, and is projected from the lens 9 onto the screen on the ceiling 26 in a stable posture by the tilting mechanism 12 without distorting the image.

Therefore, in this embodiment, the image projected onto the screen on the ceiling 26 is projected in the most easily viewable position of the patient 24, even though the image projection device 12' is placed next to the bedside of the patient 24 as explained above. The image is accurately projected without distortion, and the patient 24 can view the image for a long time without feeling any eye strain or physical fatigue.

When the sick person 24 changes his posture due to fatigue during long viewing, for example, when he raises his upper body a little, he turns the handle 19 again and adjusts the swing mechanism 12 so that the link mechanism 12
The position of the image projected onto the screen on the ceiling 26 can be adjusted through the . Since the optical axis 10 of the light beam from the light source 1 always passes through the center of the liquid crystal panel 8 and the lens 9, a clear image without distortion is sufficiently guaranteed on the screen even if the tilt position changes. Ru.

Further, the embodiment shown in FIG. 3 is for a conference or a research presentation, and even if the image projection device 12' cannot be set between the viewer 11 and the screen 26' on the wall surface 26'. , the image projection device 1 of the present invention is placed on the floor at a low position in front of the table 25'.
2' and suitably adjust its projection angle to the most preferable position and orientation, the lens 9 and liquid crystal panel 8 are aligned with the screen 2' as in the above embodiment.
It is possible to project an accurate image without distortion in a parallel orientation to 6', and the viewer can visually recognize accurate image information.

According to the state of the art at the time of filing of this invention, by connecting the liquid crystal panel 8 and the image forming electronic device 7 with a cable, the image projecting device 12' can be manufactured to be extremely small, lightweight, compact, and portable. Because of this, you can not only carry it around, but also set and reset it freely.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, the transparent original panel is not limited to a liquid crystal panel, but may also be a slide panel, and the image on the transparent original panel can be used in other than color. Various embodiments can be adopted, such as monochrome or monochrome.

It can be used not only in hospital rooms and laboratories, but also for observation and monitoring of various mechanical parts in workplaces where viewers take irregular postures. The wall surface of the mechanism section can also be used.

<Effects of the Invention> As described above, according to the present invention, it is basically possible to project an image from diagonally backward, etc. onto a screen such as a wall in a desired position and orientation, regardless of the viewer's orientation. In addition, even if there is no viewer between the projection device and the screen, there will be no interference with the projection, and a clear image without distortion will be projected, allowing all viewers to see an accurate image. Excellent effects can be achieved.

In addition, although the device is small, lightweight, and compact, making it portable and easy to set up and reset, the image projected onto the screen is large, making it possible to see a clear, large image. It's also effective.

By increasing the luminous intensity of the light source, the projected image screen can be made brighter and clearer.

Furthermore, if the viewer is a sick person as in the previous embodiment, the image can be projected at the most easily viewable position by adjusting the angle of the reflection system even if the viewer is in a lying position or slightly shifted in position. In that case, the tilting mechanism always keeps the transparent original panel and lens parallel to the screen, and the optical axis always passes through their center, so the projected image is The excellent effect of being able to maintain clarity without distortion is achieved.

In addition, a total reflection mirror that forms a light source system such as a light source and a condenser lens, and a reflection system on the projection lens side is interposed between the light source and the original image panel, and both systems are bent at a predetermined angle by a tilting mechanism. As a result, it is possible to set a heavy light source system such as a light source or condenser lens in a fixed position, and to tilt a lightweight reflective system relative to it, so that the reflective system can be tilted smoothly. This provides excellent effects such as easy operation, adjustment, and tilting work.

[Brief explanation of drawings]

The drawings are explanatory diagrams of embodiments of this invention, and the first
Figure 2 is a schematic partial cross-sectional side view of one embodiment, Figure 2 is a schematic diagram of the principle of the tilting mechanism of the image projection device, Figure 3 is a schematic side view of another embodiment, and Figure 4 is the actual implementation of the tilting mechanism. FIG. 5 is a front view of the angle adjustment device, and FIGS. 6 and 7 are schematic side views of the angle adjustment mechanism of the tilting mechanism. 1... Light source, 9... Lens, 12'... Image projection device, 10... Optical axis, 8... Transparent original panel,
26'...Screen, 3...Mirror, 12...
Tilt mechanism, 5... light source system, 6... reflection system.

Claims (1)

[Claims] 1. In an image projection device in which a transparent original image panel placed opposite to a light source on the base side faces a screen with a projection lens installed in front thereof, a mirror is interposed between the light source and the transparent original image panel. A light source system on the light source side and a reflection system on the projection lens side are configured, and in the reflection system beyond the mirror, the transmission original image panel and the projection lens are always parallel to the screen and are transmitted through them. An image projection device characterized in that a mirror, an original image panel, and a projection lens are linked to a tiltable tilting mechanism such that the optical axis of light always passes approximately through the center of both.