JPH07201215A - Guide light - Google Patents

Abstract

PURPOSE:To provide a guide light of which whole surface brightness is even. CONSTITUTION:Longitudinal illumination parts 2, 3 are arranged at the upper and lower sides of an acryl board along the longitudinal direction. The part 2 has a reflection board 4 having a sectional U shape and a lamp holder 5 is formed integratedly, and cold cathode lamp 6 having a straight tube form is retained, while the upper side of the board 1 is set in an opposition manner. The part 3 has a reflection board 7 having a sectional U shape, and a lamp holder 8 is integratedly formed at a lamp holder 8. A cold cathode lamp having a straight tube form is retained and a lower part irradiation opening 10 having a slit form is formed along the top of the board 7, while the opening side of the board 7 is mounted in opposition to the upper side of the board 1. On the back side of the board 1, a diffusion reflection layer 15 and a reflection sheet 16 are laminated, and on the front side, a display sheet 17 drawing a pictogram is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide light which guides light from a light source into a light guide plate and emits the light from a light emitting surface to display a display pattern indicating an evacuation direction as a surface light source.

[0002]

2. Description of the Related Art In recent years, an induction lamp using a light guide plate such as acrylic has become popular.

As an induction light using this acrylic plate,
For example, as described in Japanese Patent Laid-Open No. 4-179990, a linear light source is arranged so as to face the upper side of the acrylic plate, and the display pattern of the display panel is illuminated with transmitted light. Further, as described in, for example, Japanese Patent Application Laid-Open No. 57-128383, a dot pattern as a diffusing means is formed on one principal surface of an acrylic plate by using white ink or the like, and the light guided to the acrylic plate is It is possible to diffusely reflect or transmit the light, and irradiate the display plate on which the translucent pictogram is drawn on the front surface of the acrylic plate with light.

[0004]

However, in the above-mentioned conventional guide light, the acrylic plate is irradiated only from the light source on the upper side of the acrylic plate, and the light is totally reflected on the inner surface of the acrylic plate to guide the light. It is difficult to make the brightness of the light emitting surface on the entire surface of the acrylic plate uniform even with a diffusing means having a different amount of diffusion, and there is a problem that the brightness ratio of the display pattern is difficult to meet the standard.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a guide light in which the brightness of the display means is uniform.

[0006]

According to another aspect of the present invention, there is provided a guide light having a rectangular plate-like light guide plate, a pair of light sources provided on opposite sides of the light guide plate, and at least one surface of the light guide plate. The light source is provided with a diffusing means for diffusing light from the light source and emitting the light from one surface of the light guide plate and the other surface facing the light guide plate, and a display means provided on the light emitting surface of the light guide plate. .

The guide light according to claim 2 is the guide light according to claim 1, wherein the light source is provided so as to face the upper and lower sides of the light guide plate, and the light source provided on the lower side illuminates the lower part. The irradiation opening is provided opposite.

According to a third aspect of the present invention, there is provided an induction light according to the second aspect, wherein the light source provided on the upper side is either dimming or off while the light source provided on the lower side is in a full-light state. It can be turned on in that state.

A guide light according to a fourth aspect is the guide light according to the second or third aspect, in which the diffusion means has the largest diffusion amount at a position slightly deviated from the center of the light guide plate. The amount of diffusion decreases as the distance increases.

According to a fifth aspect of the present invention, there is provided an induction light according to any one of the second to fourth aspects, wherein the diffusing means has a larger amount of diffusion at the lowermost portion than at the uppermost portion, and the diffusion amount increases toward the center. It will be many.

The guide light according to claim 6 is the guide light according to any one of claims 1 to 5, wherein the light source is a reflector.
The lamp holder is integrally formed with the reflector, and the lamp is attached to the lamp holder.

An induction light according to a seventh aspect is the induction light according to the sixth aspect, which is a cold cathode lamp.

The guide light according to claim 8 is the guide light according to any one of claims 1 to 7, further comprising a lighting device provided so as to face a side of the light guide plate.

According to a ninth aspect of the present invention, there is provided an induction light according to the first aspect, wherein the light sources are provided on both right and left side edges of the light guide plate, and the lighting device lights the light source above the light guide plate. Is provided.

[0015]

In the guide lamp according to the present invention, since the light sources are provided on the opposite edges of the light guide plate, the respective light sources can uniformly emit light from the light emitting surface and uniformly illuminate the entire surface of the display means. To do.

The guide lamp according to claim 2 is the guide lamp according to claim 1, wherein a light source is provided so as to face the upper and lower sides of the light guide plate, and the light source provided on the lower side illuminates the lower part with lower irradiation. Since the openings are provided oppositely, the brightness of the entire surface of the display means is uniformly illuminated and the lower surface is illuminated.

According to a third aspect of the present invention, there is provided an induction light according to the second aspect, wherein the light source provided on the lower side is in a state where all lights are on and the light source provided on the upper side is either dimming or off. Since the light is turned on in the state of, the electric power as a whole can be reduced.

A guide light according to a fourth aspect is the guide light according to the second or third aspect, in which the diffusing means has the largest amount of diffusion at a position slightly deviated from the center of the light guide plate and goes upward and downward. Since the amount of diffusion is reduced in accordance with
Since the light source provided on the lower side illuminates not only the light guide plate but also the lower part, the light source on the lower side uniformly illuminates the brightness of the entire surface of the display unit even when the light amount on the light guide plate is smaller than that on the upper side.

A guide light according to a fifth aspect is the guide light according to any one of the second to fourth aspects, in which the diffusion means has a larger diffusion amount from the uppermost portion to the lowermost portion, and the diffusion amount increases toward the center. Therefore, the brightness of the entire surface of the display means is uniformly illuminated.

The guide lamp according to claim 6 is the guide lamp according to any one of claims 1 to 5, wherein the light source has a lamp holder integrally formed with a reflector, so that the lamp can be protected and maintained. Can be done easily.

An induction lamp according to claim 7 is the same as the induction lamp according to claim 6, wherein the lamp is a cold cathode lamp.
The lamp diameter can be made thinner and the light guide plate can be made thinner.

The guide light according to claim 8 is the guide light according to any one of claims 1 to 7, further comprising a lighting device provided so as to face a side edge of the light guide plate. Can be used well and can be miniaturized.

According to a ninth aspect of the present invention, there is provided the guide lamp according to the first aspect, wherein the light sources are provided on both right and left side edges of the light guide plate, and a lighting device for lighting the light source is provided above the light guide plate. By arranging the light source in the left-right direction and arranging the lighting device above, the balance of the outer shape becomes good.

[0024]

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

In FIG. 1, reference numeral 1 is an acrylic plate as a light guide plate having a thickness of 6 mm, which is a substantially square plate, and the upper and lower edges of the acrylic plate 1 are provided with long illumination parts 2 as light sources.
3 is provided in the longitudinal direction along the edge.

The illuminating section 2 has a reflector 4 having a U-shaped cross section whose inner surface is made of resin and which is white-painted or vapor-deposited with silver. As shown in FIG. 4, the reflector 4 has a lamp holder. 5 is integrally formed, and a straight tube-shaped cold cathode lamp 6 having a diameter of 3 mm and having a diameter of about 3 W, which faces the reflection plate 4, is held in the lamp holder 5, and the opening side of the reflection plate 4 faces the upper side of the acrylic plate 1. It is installed. Further, the illuminating unit 3 also has a reflection plate 7 having a U-shaped cross section, which is white-painted or silver-deposited on the inner surface made of resin, and a lamp holder 8 is integrally formed on the reflection plate 7. The lamp holder 8 holds a straight tube-shaped cold cathode lamp 9 having a diameter of 3 mm and having a diameter of about 3 W, which faces the reflection plate 7. A slit-shaped lower irradiation opening 10 is formed along the top of the reflection plate 7. The opening side of is attached so as to face the lower end side of the acrylic plate 1.

Further, as shown in FIG. 5, electrodes 11 and 12 are attached to both ends of the reflection plate 4, and a cold cathode lamp 6 is electrically connected to the electrodes 11 and 12. It should be noted that the electrodes 11 and 12 may not be provided in this way, but may be connected by an electric wire.

A diffuse reflection layer 15 and a reflection sheet 16 as a diffusing means are laminated on the back side of the acrylic plate 1, and a pictogram as a display pattern is drawn on the front side as shown in FIG. A display sheet 17 as a display means is provided. In addition, the diffuse reflection layer 15 has a structure shown in FIG.
As shown in, a dot pattern 18 formed of the largest white ink is formed slightly below the center in the vertical direction, and a small dot pattern 18 is formed toward the upper and lower parts, with the most diffusion amount slightly below the center, The amount of diffusion is set to decrease toward the upper and lower parts. The area of the dot pattern 18 is smaller in the lowermost part than in the uppermost part.

Further, a U-shaped frame body 21 is provided on the bottom and both sides of the acrylic plate 1, and a mounting frame 22 is provided on the top of the frame body 21. The frame body 21 is for normal use (not shown). A lighting device 23 including an inverter, an emergency inverter, and a secondary battery is housed. The mounting frame 22 is mounted on the ceiling surface 24.

Next, the operation of the above embodiment will be described.

First, during normal lighting, all of the upper cold cathode lamp 6 and the lower cold cathode lamp 9 are turned on, and the acrylic plate 1 is irradiated from above and below to guide the entire light through the acrylic plate 1. Then, the light reflected by the acrylic plate 1 is diffused and reflected by the diffuse reflection layer 15 and the reflection sheet 16, and emitted from the light emitting surface. The pictogram of the front display sheet 17 is illuminated by the light emitted from the light emitting surface, and the floor surface 2.5 m below the lower irradiation opening 10 is 1 lx.
Irradiate with the above illuminance.

Further, at the time of emergency lighting, the upper cold cathode lamp 6 is dimmed or turned off, the lower cold cathode lamp 9 is fully turned on, and the acrylic plate 1 is irradiated from below to be entirely illuminated by the acrylic plate 1. Light is guided, and the light guided to the acrylic plate 1 is diffused and reflected by the diffuse reflection layer 15 and the reflection sheet 16, and the pictogram of the front display sheet 17 is illuminated.
The average brightness of the display sheet 17 becomes 100 to 300 cd / m ² , and the light emitted from the lower irradiation opening 10 has an illuminance of 1 lx or more within a radius of 0.5 m from a point directly below the floor surface 2.5 m below. .

As described above, by dimming or extinguishing the upper cold cathode lamp 6 in an emergency, the power consumption in an emergency can be reduced and the secondary battery can be downsized, or the secondary battery having the same capacity can be used. If so, the usage time can be extended.

Further, since the lower cold cathode lamp 9 irradiates the acrylic plate 1 and the lower surface through the lower irradiation opening 10, the lower surface can be irradiated with a simple structure without using a plurality of lamps. .

Further, since the lower cold cathode lamp 9 irradiates not only the acrylic plate 1 but also the lower surface through the lower irradiation opening 10, the amount of light guided to the acrylic plate 1 is smaller than that of the upper cold cathode lamp 6. Since the maximum portion of the dot pattern 18, that is, the portion having the highest diffusion rate is provided slightly below the center, the light emitted from the light emitting surface of the acrylic plate 1 can be made uniform, and the display sheet 17 can have a substantially uniform brightness. Can be Further, since the dot pattern 18 is formed such that the lowermost portion has a larger diffusion amount than the uppermost portion, the brightness of the display sheet 17 can be made more uniform.

Further, by using the cold cathode lamps 6 and 9, the life is extended as compared with the case of using the hot cathode lamp, so that the maintenance rate is improved and the cost is reduced. Further, compared to the case of using a hot cathode lamp, it can be made into a thin tube, and since the reflectors 4 and 7 are integrally formed with the lamp holders 5 and 8, they are unitized with the cold cathode lamps 6 and 9 attached. Since the cold cathode lamps 6 and 9 can be prevented from being damaged and the like, the maintenance management becomes easy.

Since the cold cathode lamps 6 and 9 are arranged above and below the acrylic plate 1 and the lighting device 23 is arranged on the side,
Since the lighting device 23 is not affected by the heat of the cold cathode lamps 6 and 9, malfunction of the lighting device 23 can be prevented and the life of the lighting device 23 can be extended.

Further, the lower irradiation opening 10 may be provided with a columnar lens 31 having a substantially semicircular cross section to control the light irradiation of the lower surface along the longitudinal direction. In this way, since the diffused light can be collected by controlling the light collection on the lower surface, it is possible to easily obtain the illuminance equal to or more than the specified 1lx.
Further, since the specified illuminance can be easily obtained, the lamp output can be reduced, the size can be reduced, and the power saving can be achieved.

Further, as shown in FIG. 7, a dot pattern
18 does not only change the size only in the vertical direction, but also increases the area of the dot pattern 18 toward the periphery of the electrode parts of the cold cathode lamps 6 and 9 where the irradiation amount is relatively small, and diffuses the peripheral part. By increasing the ratio, the peripheral portions of the four corners of the acrylic plate 1, which are relatively dark, can be made brighter, and the brightness of the entire display sheet 17 can be made uniform.

Further, not only the lamp holder 5 having the shape shown in FIG. 4 but also the C-shaped lamp holder 5 as shown in FIG. 8 can obtain the same effect.

Further, as shown in FIG. 9, even if the lower irradiation opening 10 is not provided in the reflection plate 7 of the illuminating unit 3, the display sheet is not displayed.
Similar effects can be obtained if only 17 is irradiated.

A guide light of another embodiment will be described with reference to FIG. The illumination units 2 and 2 which are cold cathode lamps,
The lighting device 23 is arranged near the left and right ends of the acrylic plate 1 and above the lighting device 23. Further, the formation of the diffusing means on the acrylic plate 23 is similar to the above-mentioned embodiment, but the guide light of this embodiment does not require the illuminance of the lower surface, so that a dot pattern is formed as a symmetrical diffusing means. do it. As described above, since the lighting unit 2 is arranged near both the left and right sides of the acrylic plate 1, only the lighting device 23 is arranged in the vertical direction, and it is not necessary to arrange the parts below, and the fixture in the vertical direction is used. The size is reduced, and the outer shape is well balanced.

The diffuse reflection layer 15 is not limited to one made of white ink, but may be a prism or one filled with a substance having a smaller refractive index than the acrylic plate 1, so that the dot pattern of a portion having a high reflectance is made dense. Thus, the reflectance may be changed by sparsely forming the dot pattern of the portion with low reflectance. Further, the dot pattern of the diffuse reflection layer 15 may be formed on the light emitting surface side by using a diffuse transmissive material, for example, a translucent material having a larger refractive index than acrylic.

[0044]

According to the first aspect of the present invention, since the light sources are provided at the opposite edges of the light guide plate, the light sources can irradiate the light sources more uniformly than the whole, and the brightness of the entire surface of the display means can be improved. Can be illuminated uniformly.

According to the guide light of claim 2, claim 1
In addition to the above-mentioned guide light, a light source is provided so as to face the upper and lower sides of the light guide plate, and the light source provided on the lower side has a lower irradiation opening for irradiating the lower part, so that the luminance of the entire surface of the display means is made uniform. In addition to being able to illuminate, the lower surface can be illuminated to obtain a desired lower surface illuminance.

According to the guide light of claim 3, claim 2
In addition to the guide light described, the light source provided on the lower side is in the state of full light lighting, and the light source provided on the upper side is turned on in the state of either dimming lighting or extinguished, so the overall power can be reduced. .

According to the guide light of claim 4, claim 2
Alternatively, in addition to the guide light described in 3, the diffusing means is displaced slightly below the center of the light guide plate to maximize the amount of diffusion, and the amount of diffusion decreases toward upper and lower sides.
Since the light source provided on the lower side irradiates not only the light guide plate but also the lower part, the light source on the lower side has a smaller irradiation amount to the light guide plate than the light source on the upper side, so that the entire surface of the display unit can be uniformly illuminated.

According to the guide light of claim 5, claim 2
In addition to the guide light described in any one of 4 to 4, the diffusing means has a larger diffusing amount from the uppermost part to the lowermost part, and the diffusing amount increases toward the center of each, so that the brightness of the entire surface of the display part can be uniformly illuminated. .

According to the guide light of claim 6, claim 1
In addition to the guide light described in any one of 1 to 5, the light source has a lamp holder integrally formed with the reflector, so that the lamp can be protected and maintenance can be facilitated.

According to the guide light of claim 7, claim 6
In addition to the described induction lamp, since the lamp is a cold cathode lamp, the lamp diameter can be made thin and the light guide plate can be made thin.

According to the guide light of claim 8, claim 1
In addition to the guide light described in any one of 7 to 7, since the lighting device is provided so as to face the side of the light guide plate, the periphery of the light guide plate can be used more efficiently and the size can be reduced.

According to the guide light of claim 9, claim 1
In addition to the guide light described, the light source is placed near both the left and right sides of the light guide plate, so only the lighting device is placed vertically, and there is no need to place any parts below it. Is smaller, the outer shape is well balanced, and the applicable range of the ground contact location can be expanded.

[Brief description of drawings]

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

FIG. 2 is a front view of the same.

FIG. 3 is a front view showing the same dot pattern as above.

FIG. 4 is a sectional view showing the same reflector.

FIG. 5 is a front view showing the vicinity of the reflector.

FIG. 6 is a sectional view showing a reflector of another embodiment of the same as above.

FIG. 7 is a front view showing a dot pattern of another embodiment of the above.

FIG. 8 is a sectional view showing a reflector of still another embodiment of the same.

FIG. 9 is a sectional view showing a guide light of still another embodiment of the same.

FIG. 10 is a front view showing an induction lamp of another embodiment of the same as above.

[Explanation of symbols]

 1 Acrylic plate as light guide plate 2, 3 Illuminating part as light source 5, 8 Lamp holder 6, 9 Cold cathode lamp 10 Lower irradiation opening 15 Diffuse reflection layer as diffusing means 17 Display sheet as displaying means 23 Lighting device

Claims (9)

[Claims] 1. A rectangular plate-shaped light guide plate, a pair of light sources provided on opposite sides of the light guide plate, and a light guide plate provided at least on one surface of the light guide plate for diffusing light from the light source. An induction lamp comprising: a diffusing unit that emits light from one surface of the light guide plate and the other face that faces the light guide plate; and a display unit that is provided on the surface of the light guide plate that emits light. 2. The light source is provided so as to face the upper and lower sides of the light guide plate, and the light source provided on the lower side is provided with a lower irradiation opening for irradiating a lower portion. Guide light. 3. The light source provided on the upper side can be turned on when the light source provided on the lower side is in a full-light state and can be turned on or off in a dimming manner. Guide light described. 4. The diffusing means has the largest amount of diffusion at a position slightly deviated from the center of the light guide plate, and the amount of diffusion becomes smaller as going upward and downward. Guide light. 5. The guide lamp according to claim 2, wherein the diffusing means has a larger amount of diffusion in the lowermost portion than in the uppermost portion, and has a greater amount of diffusion toward the center thereof. 6. The light source comprises a reflector, a lamp holder integrally formed with the reflector, and a lamp attached to the lamp holder. Guide light described. 7. The guide lamp according to claim 6, wherein the lamp is a cold cathode lamp. 8. The guide lamp according to claim 1, further comprising a lighting device provided so as to face a side edge of the light guide plate. 9. The guide lamp according to claim 1, wherein the light source is provided on both left and right end sides of the light guide plate, and a lighting device is provided above the light guide plate to turn on the light source.