JPH06125518A - Underwater case of video display device - Google Patents

Abstract

PURPOSE:To visualize a screen from a distant location without being disturbed by reflection light by arranging a transparent plate through which the screen of the video display device stored in a case main body can be seen from the outside in its posture inclined to the screen of the device on the window of the front surface of the case main body having watertight structure. CONSTITUTION:On the box part 7 of the case main body 6 of an underwater case 5 having a watertight structure, a video monitor 1 is stored in its fixed posture, a front surface frame 8 is mounted, and a hinge 9 is provided at the upper end and is combined freely openably. A transparent glass plate 13 is watertightly fixed on a window 12 facing the oblique upper direction of the frame 8 via seal material 14 and a glass pressure frame 15 is fixed on the from 8 by a screw 16. In this case, the glass plate 13 is set to the screen 2 of the monitor 1 at an angle = 35. A hood 11 for external light interception is mounted on the frame 8 and a light absorbing plate 18 is mounted on the tip of the hood 17 so that the position of the plate may be freely adjusted by a detaching means 19. Thus, a screen 2 can be seen from a distant location without being disturbed by reflection light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater case for viewing an image display device such as a video monitor underwater.

[0002]

2. Description of the Related Art In recent years, with the spread of marine sports, the number of video equipment used underwater has increased. For example, when the video monitor is used underwater, as shown in FIG. 8, the video monitor 1 is housed in an underwater case 30 in which a transparent glass 31 is fitted in the front window, and the image projected on the screen 2 is transparent. Looking from the water through glass 31.

By the way, when the screen of the video monitor is viewed through the transparent glass in water, the external light that is overwhelmingly bright with respect to the brightness of the image projected on the screen is in the transparent glass 31 and the case 30 due to the light refractive index. It is reflected a lot at the boundary surface with the air and overlaps with the image on the screen, which makes it difficult to see because it is buried in the reflected external light. Therefore, conventionally, the rectangular tubular hood 3 for blocking external light is provided outside the window of the underwater case 30.
2 was provided, the face was brought close to the hood 32 so that outside light did not enter, and the user looked into the screen as if he looked into it.

[0004]

As described above, in the related art, the image on the screen could not be seen well unless the face was brought close to the hood and looked into it, so that it was not possible to see from a distant position. .

Therefore, an object of the present invention is to provide an underwater case of an image display device which allows a monitor image to be observed even from a distant position.

[0006]

In order to achieve the above object, an underwater case according to the present invention has a window on the front surface of a case body having a watertight structure, and a screen of an image display device housed inside the case body is seen through from the outside. The transparent plate that can be used is arranged in a posture inclined with respect to the screen.

In this case, a hood for blocking external light is provided on the side facing the transparent plate, and a light absorbing plate is provided on the inner surface side of the hood, or a screen is provided between the transparent plate and the screen of the image display device. You may arrange a magnifying lens in parallel. Further, the light absorbing plate may be detachably attached to the hood and the position thereof may be freely adjusted.

[0008]

In the present invention, since the transparent plate in front of the screen is tilted with respect to the screen, external light around the observer in the direction perpendicular to the screen will be absorbed by the transparent plate and the air inside the case. Even if it is reflected by the boundary surface of, the reflected light travels in a direction different from that of the observer. That is, the reflected light due to the external light around the observer, which has hitherto been likely to enter the eye, is hard to enter the observer's eye. Therefore, the screen can be viewed without being disturbed by the reflected light.

When the hood is provided with the light absorbing plate, the reflected light is absorbed here, so that unnecessary reflection is not repeated and the adverse effect of the reflected light is further reduced. In this case, if the light absorbing plate is detachable, it can be removed when it is not needed and can be easily replaced with another one.
Further, if the position of the light absorbing plate is adjustable, the position may be appropriately moved according to the condition of light and the viewing position. Further, if a magnifying lens is provided, the image on the screen can be seen large.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a state in which a video monitor 1 is housed in an underwater case 5 according to an embodiment of the present invention.
FIG.

The underwater case 5 of this embodiment has a case body 6 made of resin. The case body 6 has the video monitor 1 in a fixed posture (a posture facing right side in FIG. 1).
And a front frame 8 provided in the opening.

The front frame 8 is attached to the front surface of the box portion 7 in a posture in which the front frame 8 is oriented slightly obliquely upward, the upper end thereof is rotatably connected to the upper end of the box portion 7 by a hinge 9, and the lower end thereof is screwed by a screw 10. It is detachably fastened to the lower end of the box portion 7. A seam between the box portion 7 and the front frame 8 is watertightly sealed by a sealing material 11.

The front frame 8 has a window 1 which is further inclined upward.
2, a transparent glass plate 13 is watertightly fixed to the window 12 via a sealing material 14. The transparent glass plate 13 is fixed to the front frame 8 by fastening the glass pressing frame 15 to the front frame 8 with the screws 16, and the transparent glass plate 13 is tilted upward at a predetermined angle α with respect to the screen 2 of the video monitor 1. Installed in. The front frame 8 functions as a lid that opens and closes the opening of the box portion 7 by attaching the transparent glass plate 13.

A hood 17 for blocking external light is provided on the upper side of the front frame 8 so as to face the transparent glass plate 13. The hood 17 is formed so that its outer appearance is symmetrical with the lower portion of the front frame 8, and the hood 17 and the front frame 8 have a truncated pyramid shape with a narrowed front end. A light absorbing plate 18 is attached to the inner surface of the front end of the hood 17 by a detachable means 19 such as a surface fastener so that its position can be adjusted.

Next, how to set the inclination angle of the transparent glass plate 13 will be described. When substances having different refractive indices are in contact with each other and light is irradiated on the boundary surface from the substance side having a large optical refractive index to the substance side having a small optical refractive index, there is a region where the light is totally reflected depending on the incident angle condition of the light. FIG. 3 shows a case where the object on the air layer side is seen through the transparent glass plate 13 from the viewpoint A in water, and the visible range and the invisible range are divided when the angle of the line of sight is sequentially changed. Shown separately.

When the line of sight exceeds a certain angle, the condition of total internal reflection is satisfied at the boundary surface between the air in the case and the glass plate 13, so that the object beyond the transparent glass plate 13 cannot be seen. That is, the light in the transmissive area reaches the viewpoint A, whereas the light in the total reflection area does not reach the viewpoint A.
Therefore, as shown in FIG. 4, in order to make the end portion of the screen 2 appear undisturbed by the reflected light even when the visual field range is expanded from the viewpoint A to the viewpoint B, the end portion of the screen 2 is Viewpoint B
It is necessary to make sure that it falls within the transparent area at. In the present embodiment, the inclination angle α of the transparent glass plate 13 is set to 35 ° in consideration of such points, the protruding length of the light absorbing plate 18, and the like.

When it is desired to see the screen 2 of the video monitor 1 large, a magnifying Fresnel lens 20 is arranged between the screen 2 and the transparent glass plate 13 in parallel with the screen 2 as shown in FIG. Set up. The upper part of the Fresnel lens 20 is adhered to the glass plate 13 using a silicone rubber adhesive, and the lower part is fixed to the front frame 8 by screwing.

Next, the operation will be described with reference to FIG. For example, the external light “a” that glazes the tip of the light absorbing plate 18 is incident on the transparent glass plate 13 substantially vertically. Therefore, the transparent glass plate 13
And a transparent glass plate 13 that reflects at the boundary surface between the case and the air in the case.
The reflected light is substantially perpendicular to. Therefore, this reflected light does not reach the eyes of the observer in the direction perpendicular to the screen 2. Further, the external light b advances at an incident angle of 70 ° with respect to the transparent glass plate 13 and becomes 110 ° reflected light at the boundary surface between the transparent glass plate 13 and the air inside the case. The reflected light does not return to the viewpoint side, reaches the light absorbing plate 18, is absorbed and disappears.

Since the transparent glass plate 13 is inclined with respect to the screen 2 in this way, ambient light around the observer in the direction perpendicular to the screen 2 is prevented from passing through the transparent glass plate 13 and the air inside the case. Even if it is reflected by the boundary surface of and, the reflected light travels in a direction different from that of the observer. Therefore, the reflected light does not enter the eyes of the observer, and the screen is easy to see without being disturbed by the reflected light. This eliminates the need for the observer to look closely at the hood so that external light does not enter, and the viewer can see the screen at a distant position.

By adjusting the amount of protrusion of the light absorbing plate 18 in accordance with the position of the viewpoint, external light conditions, etc., it is possible to set conditions that are easier to see. Further, when the light absorbing plate 18 is no longer needed, the light absorbing plate 18 can be housed in the hood 17 so that it does not interfere. The light absorbing plate 18 may be slidably attached to the hood 17.

As a specific example of the light absorbing plate 18, for example, a plastic plate to which black sponge rubber is adhered, or a plastic plate to which black suede coating is applied can be used. FIG. 6 shows an example thereof. In the figure, 18A is a plastic plate as a substrate, 18B is a black sponge rubber or black suede coated portion, and 19 is a surface fastener.

In this case, the surfaces of the black sponge rubber and the black suede coated portion have fine irregularities as shown in FIG. Therefore, for example, when external light enters the recess, it is reflected by the inner surface of the recess, but the reflected light is significantly attenuated because the inner surface of the recess is black. Further, since the inner surface of the recess is a concave surface, it is diffusely reflected once or twice and external light is absorbed. On the other hand, the light impinging on the convex portion is remarkably attenuated because the convex portion is black, and since the convex portion has an acute angle, the remarkably attenuated external light is diffusely reflected and dispersed. Therefore, reflected light and external light are absorbed.

[0024]

According to the underwater case of the present invention, since the transparent plate on the front surface of the screen of the image display device is disposed so as to be inclined with respect to the screen, the transparent plate from the direction of the observer facing the screen. Even if the light is reflected by the transparent plate, the reflected light does not travel toward the observer. Therefore, the image on the screen is not obstructed by the reflected light and becomes difficult to see, and the image on the screen can be viewed from a distant position without blocking the external light around the observer by looking into the hood.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is a diagram for explaining a method of setting an inclination angle of the transparent glass plate of the example.

FIG. 4 is a diagram for explaining a method of setting an inclination angle of the transparent glass plate of the example.

FIG. 5 is a side sectional view of a modified example of the present invention.

FIG. 6 is a perspective view of a light absorption plate used in an embodiment of the present invention.

FIG. 7 is a diagram illustrating the principle of light absorption of the light absorption plate.

FIG. 8 is a side sectional view of a conventional underwater case.

[Explanation of symbols]

 1 video monitor (image display device) 2 screen 5 underwater case 6 case body 7 box part 8 front frame 12 window 13 transparent glass plate 17 hood 18 light absorbing plate 19 surface fastener

Claims (4)

[Claims] 1. A transparent plate capable of seeing through a screen of an image display device housed inside the case body from the outside is disposed in a window on the front surface of the case body having a watertight structure in a posture inclined with respect to the screen. The underwater case of the video display device, which is characterized in that 2. The underwater case for an image display device according to claim 1, wherein a hood for blocking external light is provided on a side facing the inclined transparent plate, and a light absorbing plate is provided on an inner surface side of the hood. 3. The underwater case of the image display device according to claim 1, wherein a magnifying lens is arranged in parallel with the screen between the transparent plate and the screen of the image display device. 4. The underwater case of the image display device according to claim 2, wherein the light absorbing plate is provided so as to be attachable to and detachable from the hood and positionally adjustable.