JPH0530229Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a display device that can use ceiling lighting to show the location or presence or absence of a desired item among a large number of items of roughly the same shape that are classified according to type, such as by shipping region, in, for example, a warehouse or terminal of a transportation company or a post office.

(Prior Art) Indicating the position or presence of such objects, unlike numerical displays, has been done by simply changing brightness or darkness by means of lighting or emitting light from lamps or light-emitting elements.

(Problems to be Solved by the Invention) Incidentally, there are cases in which only batteries can be used as a power source for the above-mentioned display device. For example, as mentioned above, in order to find a desired item among a large number of items to be transported at a transportation company classified by shipping area, conventionally, workers had to visually check each item one by one.
Because it is extremely cumbersome and inefficient, the same applicant as the present application has proposed a method for remotely identifying and displaying a desired item among a large number of conveyance items classified by shipping area. devised a device.
This device is equipped with a receiver equipped with a display and a unique digital code number for each conveyed item, and when the required code number is transmitted from a certain management location using a transmitter, the code is The display part of the receiver that matches the number emits light and the brightness of the display part changes, so it can be instantly identified. The power source for this display section is necessarily a battery because it is used in places such as warehouses and terminals where objects are frequently moved. However, since lamps and the like consume relatively large amounts of power, batteries must be replaced frequently, and if there are a large number of batteries, and the display section does not light up due to the battery being exhausted, which display section's battery is depleted? This is a major problem in putting this identification display device into practical use.

Therefore, by effectively utilizing light from various directions around the display device, the brightness and darkness of the display section can be changed when a specific code number is received, and multiple The present invention has been devised for the purpose of providing a display device that makes it easier to visually recognize only the display devices that have received a specific code number from among the display devices.

In addition, Utility Model Application No. 50-59975 discloses a device for displaying patterns such as numbers on an electro-optic light control element such as a liquid crystal display element, and a reflecting mirror provided at the rear of the electro-optic light control element. discloses a display device configured to reflect vertical light onto the back side of the electro-optic light control element so that displayed numbers and the like can be easily seen.

This is because once the angle of the reflecting mirror is adjusted, it is possible to utilize light incident from a specific direction by reflecting it to the back side of the electro-optic light control element.

However, as in the case of display devices installed on packages at shipping company warehouses, terminals, post offices, etc., the orientation of the package itself changes, or the direction of the incident light changes depending on the time of day, such as daytime or nighttime. Under conditions where the illumination light changes from side to side, the direction of incidence of the illumination light on the baggage is not constant, so if the direction of the baggage changes or the direction of the illumination light changes, the incident light reflected by the reflector will change. Light no longer irradiates the back surface of the electro-optic light control element, and the effort of rotating the reflecting mirror is required.

For example, when placed next to a window, it is necessary to operate the reflector when using the indoor ceiling lighting at night and the light coming in through the window during the day.

Further, when there is no light from the top or rear, and only light from the side, the reflecting mirror does not function, making it difficult to see numbers displayed on the electro-optic light control element. In order to solve this problem, it was necessary to provide a separate light source.

Further, even if the position of the light source is constant, if the orientation of the display devices receiving the light is constant, the reflecting mirrors of those display devices must be adjusted individually.

Apart from such problems due to the direction of light, there are the following problems in using the method to achieve the purpose of the present application.

Since it is not possible to switch the display between transparent and opaque using a specific code number from the outside, it is possible to select a
The problem is that it cannot be used to visually recognize only the display device that has received a specific code number, and the problem that the configuration of the control device and the electro-optic light control element becomes complicated, especially in the case of the electro-optic light control element. Even if letters and numbers were displayed, there was a problem in that they were difficult to see from a distance.

In the present invention, in a display device used under conditions where the incident direction of illumination light is not constant, a specific code number can be displayed using light from ceiling lights etc. without having to incorporate a special light source. It is an object of the present invention to provide a display device having a display surface that changes when reception is received.

(Means for solving the problem) Therefore, in the present invention, a display device is used under conditions where the incident direction of illumination light is not constant, and has a display surface that changes when a specific code number is received. A shutter board, such as a liquid crystal display, which is equipped with a control unit that outputs a control signal when a specific code number is received, and whose entire surface changes from opaque to transparent or from transparent to opaque depending on the control signal. of,
installed on the display surface of the display case, each side surface of the display case excluding the display surface having a light entrance window or a light entrance hole made of a light transmitting member;
A spherical reflector is disposed in the display box at a rear portion of the shutter plate to reflect incident light from at least one of the light incident holes toward the shutter plate. It was configured so that

(Function) As mentioned above, according to the display device of this invention,
Since the reflector is spherical, not only incident light from a specific direction but also incident light from a wide range of directions is reflected toward the shutter plate.

This action will be specifically explained based on FIG. 2.

In FIG. 2, when the spherical reflector 4 and the shutter plate 2 are arranged in the positional relationship shown in FIG. This is light that enters from between the two directions.

That is, the incident light in the direction L1 is reflected at the point P1 on the spherical surface, and the incident light in the direction L2 is reflected at the point P2 on the spherical surface. Light incident from between the direction of L1 and the direction of L2 is reflected at a portion of the spherical surface between points P1 and P2.

And when you receive a specific code number,
Since the entire surface of the shutter plate changes from opaque to transparent or from transparent to opaque, the brightness of the display section can be changed using reflected light.

(Embodiment) Hereinafter, a preferred embodiment of this invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a display case, and a rectangular display hole 1b is bored in the display surface 1a of the display case 1, and a shutter made of liquid crystal is formed in the display hole 1b. Plate 2 is fitted. or,
Apart from the display surface 1a of the display case 1, rectangular light entrance holes 1f are formed in the upper side 1c, back side 1d, and both sides 1e, respectively, and each of these light entrance holes 1f is filled with transparent synthetic resin. The light entrance window 3 is constructed by fitting a flat plate-like body made of a light-transmitting member such as the above. A spherical reflector 4 is housed in the center of the display case 1, that is, at the rear of the shutter plate 2, and a control section 5 for the shutter plate 2 is further installed inside the display case 1.

To explain the operation of the embodiment device having the above configuration, assume that the operation of the display device is applied to the above-mentioned conveyed object identification display device. A receiver with a code number is attached to each conveyance classified by shipping area. In warehouses and terminals, lighting lights 6 are turned on even during the day, so this light passes through the light entrance window 3 and enters the display case 1, is reflected by the reflector 4, and is reflected on the rear surface of the shutter plate 2. is constantly irradiated. However,
When each control unit 5 has not received its own code number, the shutter plate 2 is not energized, the shutter plate 2 is in an opaque state, and the display case 1 is not energized.
Reflected light cannot be seen from outside. That is, the hidden state is maintained. When the control unit 5 receives a code number unique to itself and energizes the shutter plate 2, the shutter plate 2 becomes transparent and the reflected light can be visually recognized from the outside.
That is, it becomes a display state. Further, the shutter plate 2 may be configured to change from a transparent state to an opaque state when energized, and in such a case, it will be indicated that the object whose reflected light cannot be visually recognized is the desired conveyance object. .

In this way, if the reflector 4 is a conventional plane mirror, only light from a specific direction can be reflected onto the rear surface of the shutter plate 2, but in this embodiment, a spherical reflector is used. Light from various directions can also be reflected on the rear surface of the shutter plate 2.

Therefore, even when the incident direction of light changes or the orientation of the display device changes, the light incident from either direction can be reflected to the rear surface of the shutter plate 2 without adjusting the orientation of the reflectors individually. It can be reflected.

It should be noted that this invention is not limited to the above-described embodiment, and it goes without saying that various embodiments can be considered without departing from the scope of the claims for utility model registration. For example, instead of the light entrance window 3, a simple It may be used as a light entrance hole, and the application device is not limited to an identification display device for conveyed objects, but can be applied to various devices that simply display light emission. However, it is necessary to use it in an environment where the lighting is always on.

(Effect of the invention) As mentioned above, according to the display device of this invention,
By making the reflector spherical, it is expected that it will be irradiated not only by incident light from directly above, but also by lighting lights mounted on the ceiling in warehouses and terminals, without having to manipulate the reflector. The light from at least one of the light coming from all directions can be reflected toward the shutter plate, so that the change between the case where the shutter plate is opaque and the case where it is transparent can be clearly seen at any time. becomes possible.

Further, since the change in brightness of the shutter body changes over the entire surface of the shutter plate, it is easy to visually recognize the change. Further, since the change is made over the entire surface of the shutter plate, it is possible to obtain the effect that both the control device and the shutter plate have simple structures and can be provided at low cost.

And when you receive a specific code number,
Since the entire surface of the shutter board is changed to display the display using reflected light, it is extremely easy to select only the display device that has received a specific code number from among multiple display devices, each of which is identified by an individual code number. This has the effect of making it possible to find

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the display device of this invention, and FIG. 2 is an explanatory diagram illustrating the operation of the display device of this invention. 1...Display box, 1a...Display surface, 1c, 1
d, 1e... side, 2... shutter plate, 3...
Light entrance window, 4...Reflector, 5...Control unit.

Claims (1)

[Claims for Utility Model Registration] A display device that is used under conditions where the incident direction of illumination light is not constant and has a display surface that changes when a specific code number is received, the display device having a display surface that changes when a specific code number is received. a control unit that outputs a control signal when the
A shutter plate such as a liquid crystal whose entire surface changes from opaque to transparent or from transparent to opaque is installed on the display surface of the display case, and a light-transmitting member is attached to each side of the display case other than the display surface. A spherical reflector is provided in the display box to direct incident light from at least one of the light entrance holes to the shutter plate. 1. A display device, characterized in that the display device is located inside and located at the rear of the shutter plate so as to reflect light toward the viewer.