JPH09146482A - Sign guide board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify a display part even upon the occurrence of a power failure, and ensure low power consumption by applying the constitution that a light source to emit light capable of exciting a phosphor having a persistence characteristic is laid at least at one position of the edge of a photoconducting board. SOLUTION: The prescribed pattern of display part is drawn on the back of a photoconducting board 1, using a phosphor 2 having a persistence characteristic. Also, a light emitting diode as a light source 3 to excite the phosphor 2 of the display part is buried in the edge of the photoconducting board 1. Furthermore, the edge of the photoconducting board 1 is coated with a white substance and a reflector 4 is thereby formed. The phosphor 2 forming the display part, when in contact with light from the light source 3, is excited and emits light. In this case, the emission of light due to photo-excitation continues over a certain time, even when the light source 3 stops emitting light. Also, the display part continues to emit light, while gradually lowering brightness until the next lighting of the light source 3, even when the light source 3 is intermittently turned on for a short time. According to this construction, the lighting time of the light source 3 can be shortened by applying a timer function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sign guide plate, and more particularly to a sign guide plate whose display section can be recognized even in the absence of power during a power failure.

[0002]

2. Description of the Related Art Ships, subways, underground buildings, and the like are equipped with signboards for displaying various information in an emergency. Conventionally, most of such sign guide plates have a light source so that the display unit can be recognized even at night or in a dark place. However, such a sign guide plate cannot serve as a sign guide plate because the display unit cannot be recognized in the event of a power failure that occurs during an earthquake or other disaster. Therefore, it was necessary to provide an emergency battery for a power failure.

As a conventional sign guide plate, for example, an arbitrary display is written on a light guide plate or the like, and at night or in a dark place, the display unit can be recognized by turning on a light source such as a light bulb provided on the back. There was something to do. Also recently,
Sign guide plates equipped with light emitting diodes and batteries as light sources have also come to be seen.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sign guide plate whose display section can be recognized even during a power failure and which consumes low power.

[0005]

The sign guide plate according to the present invention comprises:
A display pattern is formed on the main surface side of the transparent light guide plate with an afterglow phosphor, and a light source that emits light capable of exciting the afterglow phosphor is provided at least at one end surface of the light guide plate. It is characterized by being provided.

Further, the sign guide plate of the present invention has a timer function, and is characterized by intermittently turning on the light source for a short time to excite the afterglow phosphor.

Further, ZnS: Cu, ZnCdS: Cu, ZnC which are well known as the above-mentioned afterglow phosphor are known.
Although d: AgCl or the like can be used, the marker guide plate of the present invention is characterized by using an afterglow phosphor represented by the following general formula. (M1-pq, EupQq) O ・ n (Al1-mBm) 2O3 ・ k
P2O5 · αX (however, 0.0001 ≦ p ≦ 0.5 0.0001 ≦ q ≦ 0.5 0.5 ≦ n ≦ 3.0 0 <m ≦ 0.5 0 ≦ k ≦ 0.2 0 ≦ α ≦ 0.5 0 ≦ α / n ≦ 0.4, where M in the composition formula is at least one selected from the group of divalent metals consisting of Mg, Ca, Sr, Ba, and Zn. And Q is a co-activator and is Mn, Zr, Nb, Pr, Nd, Gd, Tb,
At least one selected from the group consisting of Dy, Ho, Er, Tm, Yb, and Lu, and X is F, Cl, B
At least 1 selected from the halogen elements consisting of r and I
Is a seed. )

The afterglow phosphor represented by the above general formula is
Depending on its chemical composition, the emission color tone can be changed significantly. The chemical composition is a phosphor mainly composed of an aluminate activated with divalent europium, and particularly 0.5 ≦ n
In the range of ≦ 1.5, when the divalent metal M contains Ca in the range of 70 to 100 mol%, the fluorescent color and the afterglow exhibit a highly efficient blue system. The crystal structure of this afterglow phosphor is mainly composed of a monoclinic system and is excited by ultraviolet rays and visible rays in a wavelength range of 420 nm or less.

When the chemical composition is in the range of 0.5 ≦ n ≦ 1.5 and the divalent metal M occupies the range of 70 to 100 mol% of Sr, the fluorescent color and the afterglow color are highly efficient green system. Present.
The crystal structure of this afterglow phosphor is mainly composed of a monoclinic system.
It is excited by ultraviolet rays and visible rays in the wavelength range of 00 nm or less.

When the chemical composition is in the range of 1.5 <n ≦ 3.0 and the divalent metal M accounts for 80 to 100 mol% of Sr, the fluorescent color and the afterglow color are bluish green. . The crystal structure of this afterglow phosphor is mainly orthorhombic and 460 nm.
It is excited by ultraviolet rays and visible rays in the following wavelength range.

Further, the sign guide plate of the present invention is characterized in that a light emitting diode is used as a light source capable of exciting the afterglow phosphor. The afterglow phosphor can change the emission color and the afterglow color as described above, but since the emission wavelength range of light for exciting the afterglow phosphor also changes, these ranges A light emitting diode having a peak of emission wavelength is used for.

Further, when the sign guide plate of the present invention is installed outdoors, a solar cell and a battery are combined as a power source to convert sunlight into electricity and charge the battery. Electric power can also be used to light the light emitting diode.

[0013]

1 is a schematic sectional view showing a sign guide plate of the present invention. On the back surface of the light guide plate 1, a display unit having a pattern as shown in the drawing is drawn by using the afterglow phosphor 2. A light source 3 that excites the afterglow phosphor 2 of the display unit is provided on the end surface of the light guide plate 1.
As a light emitting diode is embedded as. Further, a white material is applied to the end surface of the light guide plate 1 to form the reflection plate 4.

As shown by the arrow in FIG. 1, the light emitted from the light emitting diode reaches the end surface of the light guide plate 1 while repeating total reflection inside the light guide plate 1. The light reaching the light guide plate 1 is reflected by the reflection plate 4 formed on all the end faces and repeats total reflection. Therefore, since the light from the light emitting diode which is the light source 3 can be guided to the entire light guide plate 1 to be brightened, the display portion formed on the light guide plate 1 can be recognized. Further, when the light emitted from the light emitting diode hits the afterglow phosphor 2 forming the display portion, the afterglow phosphor 2 is excited and emits light,
Even if the light emission from the light emitting diode is stopped, the light emission caused by the photoexcitation continues for a certain period of time, so that the display portion can be recognized.

Therefore, even if the light source 3 is intermittently turned on for a short period of time, the display section made of the excited afterglow phosphor 2 continues to emit light while the brightness is reduced until the next light source 3 is turned on. You can Therefore, in the present invention, since the light source 3 that excites the afterglow phosphor 2 has a timer function, the lighting time of the light source 3 can be shortened, and the life of the battery can be extended. For example, when the light source is turned on for 10 seconds every hour, the power consumption is about 1/360 of that when the light source is not provided, and the battery life is extended accordingly.

Furthermore, when a light emitting diode is used as the light source 3 of the sign guide plate, the light emitting diode has a long life and consumes less power, so that the running cost is low and the maintenance is not required, and the above-described effects are further obtained. . Moreover, since it is also excellent in vibration resistance, it has an advantage that it is less likely to be broken or broken down compared to other light sources even in the event of a disaster such as an earthquake and has high reliability. Further, since the light emitting diode is small, the guide sign plate can be made small and lightweight.

The afterglow phosphor represented by the above general formula is
It has high brightness, long afterglow time, and very excellent afterglow characteristics. Therefore, it is very preferable to use this afterglow phosphor for the sign guide plate of the present invention because it can continue to emit bright light for a long time even if the light emission from the light source is stopped.

[0018]

EXAMPLES The sign guide plate of the present invention will be described based on examples. Here, the green emission, blue emission, and blue-green emission afterglow phosphors used in the present invention can be adjusted as follows.

[Preparation of green-based afterglow phosphor] SrCO3 as a phosphor raw material was 140.98 g (0.955 mo).
l), 88.14 g (0.865 mol) of Al2O3,
5.28 g (0.015 mol) of Eu2O3, Dy203
2.80 g (0.0075 mol) and H3BO3 of 5.
63 g (0.091 mol), and (NH4) 2HPO4
7.92 g (0.060 mol) of was added to a ceramic pot containing alumina balls as a mixing medium, and mixed for 2 hours with a roller to obtain a mixed raw material before firing of the phosphor (hereinafter referred to as raw raw powder). Next, the raw raw material powder is placed in an alumina crucible and fired at 1400 ° C. for 5 hours in a reducing atmosphere to obtain a phosphor fired product. Next, the calcined product is crushed and passed through a 200-mesh sieve, and (Sr0.955Eu0.03Dy0.015) O ・ 0.91 (Al0.95B0.05) 2O3
・ Obtain 0.03P2O5 phosphor. This phosphor has an emission peak of 5
It shows a green light emission with high visibility at 15 nm.

[Preparation of blue afterglow phosphor] 95.59 g (0.955 mo) of CaCO3 was used as a phosphor raw material.
l), Al.sub.2O.sub.3 94.01 g (0.922 mol),
2.64 g (0.0075 mol) of Eu2O3, Nd2
5.05 g (0.015 mol) of O3, 6.00 g (0.097 mol) of H3BO3, and (NH4) 2HP
7.92 g (0.060 mol) of O4 was placed in a ceramic pot containing alumina balls as a mixing medium and mixed with a roller for 2 hours to obtain raw raw powder. Next, the raw raw material powder is put into an alumina crucible, and the raw material is put in a reducing atmosphere at 1400 ° C. for 5 hours.
The phosphor is fired for a time to obtain a phosphor fired product. Next, crush the baked product,
Pass through a 200-mesh sieve and (Ca0.955Eu0.015Nd0.03) O ・
A 0.97 (Al0.95B0.05) 2O3.0.03P2O5 phosphor is obtained. This phosphor exhibits blue light emission with an emission peak at 420 nm.

[Preparation of Blue-Green Afterglow Phosphor] As a phosphor raw material, 140.98 g (0.955 mo) of SrCO 3 was used.
l) and 169.40 g (1.663 mo) of Al2O3
l), 5.28 g (0.015 mol) of Eu2O3, D
2.80 g (0.0075 mol) of y203, H3BO3
10.8 g (0.175 mol), and (NH4) 2H
7.92 g (0.060 mol) of PO4 was placed in a ceramic pot containing alumina balls as a mixed medium,
Mix with a roller for 2 hours to obtain raw raw powder. Next, the raw raw material powder is placed in an alumina crucible and fired at 1400 ° C. for 5 hours in a reducing atmosphere to obtain a phosphor fired product. Next, the calcined product is crushed and passed through a 200-mesh sieve to obtain (Sr0.955Eu0.03Dy0.01
5) Obtain O.1.75 (Al0.95B0.05) 2O3.0.03P2O5 phosphor. This phosphor exhibits bluish green emission having an emission peak at 490 nm.

[Embodiment 1] FIG. 1 is a schematic sectional view showing an embodiment of the sign guide plate of the present invention, and FIG. 2 is a plan view of the sign guide plate of FIG. 1 viewed from the observation surface side. A display unit as shown in FIGS. 1 and 2 is formed on the back surface of the light guide plate 1 having a thickness of about 2 mm by using the green-based afterglow phosphor 2 adjusted as described above. Subsequently, two holes are provided on the end surface of the light guide plate 1, and the hole has an emission wavelength of 460 nm and an emission output of 1200 μm.
One blue light-emitting diode 3 made of a gallium nitride-based compound semiconductor having W was embedded therein. After embedding the light emitting diode 3, a white material that reflects light is applied to the side surface of the light guide plate 1 to form the reflector 4.

Then, a timer for controlling the lighting of the light source is connected. This timer is designed to turn on the light source for 10 seconds every hour. The sign guide plate thus obtained is sufficiently recognizable because the afterglow phosphor 2 of the display unit emits green light and continues to emit brightly until the next light source is turned on even if the light source is turned off. Met.

[Example 2] A sign guide plate is manufactured in the same manner as in Example 1. However, the blue-green based afterglow fluorescent substance adjusted as described above is used as the afterglow fluorescent substance, and a light emitting diode having a peak in the ultraviolet region of a wavelength of 365 nm is used as the light source. Except for this, the same procedure as in Example 1 was performed.
The sign guide plate obtained in this way is sufficiently recognizable because the afterglow phosphor of the display unit emits blue-green light and continues to emit brightly until the next light source turns on even if the light source is turned off. Met.

[0025]

As described above, in the sign guide plate of the present invention, since the display portion is formed by using the afterglow phosphor, the display portion has afterglow even when the power is turned off.
The display unit can be recognized. Further, by controlling the light source that excites the afterglow phosphor with a timer, power consumption can be reduced, the battery life can be extended, and the display function can be maintained for a long time even in a dark state.

Further, since the afterglow phosphor represented by the above general formula has a high brightness and a long afterglow time, when the afterglow phosphor is used for the sign guide plate, the visibility of the display portion is good. Moreover, it is more effective because the lighting time of the light source controlled by the timer can be shortened and the extinction time can be lengthened. Furthermore, by using a light emitting diode as a light source, it is possible to obtain a highly reliable sign guide plate which can be reduced in power consumption and weight.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a sign guide plate of the present invention.

FIG. 2 is a plan view showing an embodiment of the sign guide plate of the present invention.

[Explanation of symbols]

 1 ... Light guide plate 2 ... Afterglow phosphor 3 ... Light source 4 ... Reflector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area C09K 11/70 CQF 9280-4H C09K 11/70 CQF 11/71 9280-4H 11/71 G09F 13 / 20 G09F 13/20 D

Claims (4)

[Claims] 1. A transparent light guide plate having a display pattern formed on the main surface side thereof with an afterglow phosphor, and at least one portion of an end face of the light guide plate can excite the afterglow phosphor. A sign guide plate comprising a light source that emits light. 2. The sign guide plate according to claim 1, which has a timer function and intermittently turns on a light source to excite the phosphorescent phosphor. 3. The sign guide plate according to claim 1, wherein the afterglow phosphor is an aluminate phosphor represented by the following general formula. (M1-pq, EupQq) O ・ n (Al1-mBm) 2O3 ・ k
P2O5 · αX (however, 0.0001 ≦ p ≦ 0.5 0.0001 ≦ q ≦ 0.5 0.5 ≦ n ≦ 3.0 0 <m ≦ 0.5 0 ≦ k ≦ 0.2 0 ≦ α ≦ 0.5 0 ≦ α / n ≦ 0.4, where M in the composition formula is at least one selected from the group of divalent metals consisting of Mg, Ca, Sr, Ba, and Zn. And Q is a co-activator, Mn, Zr, Nb, Pr,
At least one selected from the group consisting of Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
X is at least one selected from halogen elements consisting of F, Cl, Br and I. ) 4. The sign guide plate according to claim 1, 2 or 3, wherein the light source is a light emitting diode.