JPH06281802A - Half mirror and electrically decorating advertisement - Google Patents

Abstract

PURPOSE:To provide the half mirror which is adequately set in the reflectivity and transmittance of incident light and has versatility by forming a film of aluminum and specifying the reflectivity and transmittance in approximately the entire regions of visible rays. CONSTITUTION:This half mirror M consists of a three-layered structure consisting of a glass substrate 1, the film 2 and a protective film 3. This substrate 1 consists of an ordinary glass material and is not limited to a transparent material. The glass materials in which light diffusing agents, coloring agents, etc., are incorporated are equally acceptable. The film 2 is formed out of aluminum (Al) and any of known means, such as sputtering method, vapor deposition method and ion plating method, by using pure aluminum are usable for the means for forming the film. This film 2 is so set that the reflectivity of the reflected light RH to the incident light H attains about 40% and the transmittance of the transmitted light TH about 45% in a entire visible rays (about 400 to 700mm wavelength) region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half mirror and an illuminated signboard. More specifically, an improvement relating to the usability of a half mirror formed by providing a metal coating on a glass substrate,
Regarding an illuminated signboard using this half mirror.

[0002]

2. Description of the Related Art Heretofore, as a half mirror and an illuminated signboard, for example, one in which a metal film is provided on a glass substrate by a sputtering method, a vapor deposition method, an ion plating method or the like is known.

In this conventional half mirror, a glass substrate has a relatively low reflectance by a coating and a part of incident light is reflected as reflected light. Used for applications such as window glass.

In such a conventional half mirror, the reflectance of incident light is lower and the transmittance thereof is higher than that of an ordinary mirror.
Since it has the property that the reflectance of incident light is higher and the transmittance is lower than ordinary glass, it is halfway to function as an ordinary mirror or glass, so it is not used as a window glass for buildings. It has a problem that it is not provided to

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and a versatile half mirror in which reflectance and transmittance of incident light are appropriately set, and It is an object of the present invention to provide an illuminated signboard that effectively uses a half mirror having various properties.

[0006]

In order to solve the above-mentioned problems, the half mirror according to the present invention is a half mirror in which a metal film is provided on a glass substrate, as described in claim 1. It is made of aluminum and has a reflectance of incident light of about 40% and a transmittance of about 45% over the entire visible light range.

Further, the electric signboard according to the present invention is defined in claim 2.
The display device according to claim 1, which is incorporated as a signboard display surface.
The half mirror and a display content part that is transparently formed on the sign display surface with a translucent material and is detachably installed on the back side of the sign display surface, and installed on the back of the display content part. The display contents part, the light source for projecting light toward the back of the signboard display surface, the control part for switching on / off of the light source, and the light source existing on the front surface side of the signboard display surface connected to the control part And a sensor for transmitting the detection signal to the control unit.

[0008]

According to the above-mentioned means, according to the first aspect of the present invention, the reflectance sufficient to function as an ordinary mirror and the transmittance capable of transparently displaying appropriate display contents by light projection can be obtained. Since it can be used as a mirror or a transparent display material, the problem of providing a versatile half mirror in which reflectance and transmittance of incident light are appropriately set is solved.

Further, according to the second aspect, the functions as the ordinary mirror and the transparent display material can be automatically switched by the control unit and the sensor, and the display function excellent as the signboard can be obtained. The problem of providing an illuminated signboard that effectively uses a half mirror having the above-described properties is solved.

[0010]

Embodiments of the half mirror and the electric signboard according to the present invention will be described below with reference to the drawings.

First, an embodiment of the half mirror according to the present invention shown in FIGS. 1 and 2 will be described.

In this embodiment, as shown in FIG. 1, a half mirror M having a three-layer structure of a glass substrate 1, a coating film 2 and a protective film 3 is shown.

The glass substrate 1 is made of a normal glass material. However, the material is not limited to a transparent material, and may be a material mixed with a diffuser, a colorant, or the like.

The coating 2 is made of aluminum (Al). As a forming means, any known means such as a sputtering method using pure aluminum, a vapor deposition method, an ion plating method and the like can be used. The coating film 2 is set so that the reflectance of the reflected light RH with respect to the incident light H is approximately 40% and the transmittance of the transmitted light TH is approximately 45% in almost the entire visible light (wavelength approximately 400 to 700 nm). did. That is, as is apparent from FIG. 3, when the reflectance is set to 40% and the transmittance is set to 45% at a wavelength of around 530 nm where the sensitivity of the human eye is highest, the reflectance is 40 ± 5 in almost the entire visible light range. %, Transmittance 45 ± 5%
I was able to

The reason for selecting aluminum as the material of the coating 2 is as follows. That is, in order to make a plate material having the opposite properties as a mirror and a transmission plate, such as an illuminated signboard described in claim 2, both the reflectance and the transmittance are set to about 40% and about 45%, respectively. In addition, it is ideal that a colorless and transparent material is ideal. When materials other than aluminum are used, there are many problems that should be overcome in terms of ease of manufacture, durability, etc., but after repeated experiments, it was found that aluminum is optimal for the above-mentioned colorless transparency. found. Further, according to the experiments by the inventor, this setting is determined by the film thickness of the coating film 2, but it has been confirmed that the suitable film thickness varies depending on the selection of the forming means of the coating film 2 described above. .

The protective film 3 is made of quartz (silicon dioxide SiO 2
2) Select. The protective film is formed because aluminum is selected as the film 2 as described above, and therefore it is preferable to form the protective film. That is, if another material is selected for the coating film 2, a material having excellent durability can be easily manufactured without the need for a protective film, but since aluminum is selected, it can be easily manufactured without a protective film depending on environmental conditions. This is because there is a risk of oxidation. This protective film 3 is formed by forming quartz on the coating film 2 by a conventional method. The thinner the film, the better, and it must be at least 100 angstroms or less. Otherwise, both the reflectance and the transmittance cannot be achieved at the same time. When the protective film 3 is formed, physical damage such as peeling of the coating film 2 and chemical damage such as oxidation of the coating film 2 are effectively prevented.

The half mirror M having such a three-layer structure has a considerably higher reflectance than the conventional half mirror, and functions sufficiently as an ordinary mirror. Further, the transmittance is considerably higher than that of the conventional mirror, and if the light is projected, appropriate display contents can be transparently displayed, and it also functions as a transparent display material. Therefore, it can be used in a considerably wide range of fields.

Next, an embodiment of the illuminated signboard according to the present invention shown in FIGS. 3 and 4 will be described.

In this embodiment, the above-mentioned half mirror M is shown as the signboard display surface 4 on which the display contents such as advertisements are transparently displayed.

On the back side of the signboard display surface 4, the signboard display surface 4
The display content portion 5 on which the content to be transparently displayed is displayed is detachably provided, and the display content can be changed. The display content portion 5 is formed of a material having a light projecting property such as a transparent or translucent synthetic resin film or white or thin colored paper.

At the back of the display content portion, a light source 6 including a display content portion 5, a fluorescent lamp for projecting light toward the back side of the signboard display surface 4, a super-luminous light emitting diode and the like is installed.

A control unit 7 is provided near the light source 6 to switch between turning on and off the light source 6.
The configuration of the control unit 7 is determined by the switching control mode. That is, if the light source 6 is simply switched on / off selectively, a simple relay circuit configuration is sufficient, and the light source 6 is switched on / off after several blinks. If so, it is necessary to configure a CPU capable of setting the control mode.

A sensor 8 connected to the control unit 7 is provided near the signboard display surface 4. This sensor 8 turns on the light source 6 existing on the front side of the signboard display surface 4,
Switching off the light The switching element N is detected and the detection signal is transmitted to the control unit 7. The element N can be freely selected such as person, vehicle, temperature, and humidity, and the structure and performance of the sensor 8 are selected according to the element N.

According to such an embodiment, for example, a person is selected as the element N, and when the person is apart from the sensor 8 (signboard display surface 4) by a certain distance, the light source 6 is turned off and the signboard is turned off. Make the display surface 4 function as a normal mirror,
When a person approaches the sensor 8 within a certain distance, the light source 6 is turned on to display the display content of the display content section 5 on the signboard display surface 4.
It can be seen through. At this time, the display content section 5
If the display content of is an advertisement, the light source 6 is turned off when a person is not nearby and the light source 6 is turned on only when the person is nearby to save energy, and the advertisement content is suddenly displayed when a person approaches. It will call attention. On the contrary, when a person is separated from the sensor 8 by a certain distance,
When the light source 6 is turned on and the display content of the display content section 5 is transparently displayed on the signboard display surface 4, and when a person approaches the sensor 8 within a certain distance, the light source 6 is turned off and the signboard display surface 4 is normally displayed. It can also be used as a mirror for a pair to try on eyeglasses and earrings. Regarding human detection, the image of the human, footsteps, body temperature, etc. can be detected by selecting the sensor 8.

In addition to the above, various elements N can be set to be used for various displays other than advertisement.

[0024]

As described above, the half mirror according to the present invention has the reflectance capable of functioning as an ordinary mirror and the transmittance capable of transparently displaying the display contents by light projection. Since it can be used as a fluoroscopic display material, the reflectance and the transmittance of incident light are appropriately set, and there is a versatility effect.

Further, in the illuminated signboard according to the present invention, the functions of the ordinary mirror and the transparent display material can be automatically switched by the control unit and the sensor, and the display function of the signboard which is excellent in alerting power is provided. As a result, the half mirror according to the present invention can be effectively used.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a half mirror according to the present invention.

FIG. 2 is a graph showing reflectance and transmittance in almost the entire visible light region of FIG.

FIG. 3 is a side view showing an embodiment of the illuminated signboard according to the present invention.

FIG. 4 is a side view showing a display operation state of FIG.

[Explanation of symbols]

 1 Glass Substrate 2 Coating 4 Signboard Display Surface 5 Display Content 6 Light Source 7 Control 8 Sensor H Incident Light RH Reflected Light TH Transmitted Light M Half Mirror

Claims (2)

[Claims] 1. A half mirror comprising a glass substrate provided with a metal coating, wherein the coating is made of aluminum, and the reflectance of incident light is set to about 40% and the transmittance is set to about 45% in substantially the entire range of visible light. A half mirror that is characterized. 2. The half mirror according to claim 1, which is incorporated as a signboard display surface, and a content transparently displayed on the signboard display surface is formed of a translucent material so that it can be attached to and detached from the back side of the signboard display surface. Connected to the control section, the display content section provided, the light source installed on the back of the display content section and projecting light toward the back side of the display surface of the signboard, the control section for switching the light source on and off An illuminated signboard that includes a sensor that detects an element for switching on / off of a light source that is present on the front side of the signboard display surface and that transmits a detection signal to the control unit.