JPH07320510A - Guide light - Google Patents

Abstract

(57) [Summary] [Object] To provide an induction lamp that satisfies the standard of average luminance of display means by using a light guide plate 12 having an aspect ratio of 1: 1. [Structure] The light guide plate 12 has at least one side surface as a light exit surface 14 and one circumferential surface as a light entrance surface 13, and has a vertical and horizontal dimension of approximately 20.
0mm x 200mm, thickness is 5 to 15mm. The display means is arranged on the light emitting surface 14 of the light guide plate 12. The cold cathode fluorescent lamp 19 is disposed on the light entrance surface 13 of the light guide plate 12 and has a tube length of 20 mm.
0 mm to 250 mm, and pipe diameter is 2 to 5 mm. The total luminous flux of the cold cathode fluorescent lamp 19 is 80 to 120 lm, and the average luminance of the display means is 500 to 800 cd / m ² . [Effect] The light of the cold cathode fluorescent lamp 19 can be effectively guided to the light guide plate 12, and the standard of the guide lamp can be sufficiently satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide light for displaying a pattern such as a direction of an emergency exit using a light guide plate as a surface light source.

[0002]

2. Description of the Related Art Hitherto, as a guide light using a light guide plate made of acrylic or the like, a structure described in, for example, Japanese Patent Laid-Open No. 4-206106 is known.

This guide light is provided with a light guide plate having one side surface as a light exit surface and an upper peripheral surface as a light entrance surface. Display means having a pictogram is arranged on the light exit surface of the light guide plate.
A fluorescent lamp is arranged so as to face the light incident surface. The light guide plate is formed in a horizontally long aspect ratio of about 1: 3.

[0004]

By the way, recently, a standard using a display means of a square shape having an aspect ratio of 1: 1 has been studied in the guide light indicating the direction of the emergency exit or the like. Then, in the standard of such guide light, a standard is usually set so that a value of a certain value or more can be obtained in the average brightness and the brightness ratio of the display means.

However, when a square light guide plate is used in correspondence with such a square display means, the width of the light entrance surface of the light guide plate becomes narrow, and the light emitted from the fluorescent lamp is effectively displayed. However, there is a problem that it is difficult to improve the average brightness.

The present invention has been made in view of the above points, and an object thereof is to provide a guide light which can sufficiently satisfy the standard of the average brightness of the display means.

[0007]

A guide light according to claim 1 has at least one side surface as a light exit surface and one circumferential surface as a light entrance surface, and has vertical and horizontal dimensions of approximately 200 mm x 200 mm and a thickness of 5 to 15 mm. Light guide plate, display means disposed on the light exit surface of the light guide plate, and cold cathode fluorescent light disposed on the light entrance surface of the light guide plate and having a tube length dimension of 200 mm to 250 mm and a tube diameter dimension of 2 to 5 mm. Lamp, the total luminous flux of the cold cathode fluorescent lamp is 80 to 120 lm, and the average luminance of the display means is 500 to 800 cd / m ² .

According to another aspect of the present invention, there is provided a light guide plate having at least one side surface as a light exit surface and one circumferential surface as a light entrance surface, and a light guide plate having vertical and horizontal dimensions of about 200 mm × 200 mm and a thickness of 5 to 15 mm. Display means arranged on the light exit surface of the light guide plate,
It is arranged on the light entrance surface of the light guide plate and has a tube length of 200 mm to
250 mm, discharge path length is 400 mm to 500 mm, tube diameter dimension is 2 to 5 mm, both electrode parts are formed on one end side and discharge bent parts are formed on the other end side so that the discharge conduit is bent. A cold cathode fluorescent lamp having a hermetically sealed container, the total luminous flux of the cold cathode fluorescent lamp is 80 to 250 lm, and the average luminance of the display means is 250 to 800 cd / m ² .

According to a third aspect of the present invention, there is provided the induction light according to the first or second aspect, wherein the total luminous flux of the cold cathode fluorescent lamp is 40 to 60 lm and the average luminance of the display means is 100 to 300 cd in an emergency. / m ² .

An induction lamp according to a fourth aspect is the induction lamp according to any one of the first to third aspects, in which a plurality of cold cathode fluorescent lamps are provided, and the cold cathode fluorescent lamps are arranged on opposing peripheral surfaces of the light guide plate. There is something.

[0011]

In the guide light according to the first aspect, the vertical and horizontal dimensions are approximately 20.
A light guide plate having a size of 0 mm × 200 mm and a thickness of 5 to 15 mm and a display means arranged on the light exit surface of the light guide plate are used, and a tube length dimension is 200 mm to 250 mm and a tube diameter dimension is 2 to 5.
Since the cold cathode fluorescent lamp of mm is used, the light of the cold cathode fluorescent lamp is efficiently guided to the light guide plate. Therefore, the total luminous flux of the cold cathode fluorescent lamp is 80 to 120 lm, and the average brightness of the display means is 500 to 80 defined by the standard of the guide light.
It becomes 0 cd / m ² .

According to another aspect of the present invention, there is provided a guide light having a length and width of about 200 mm × 200 mm and a thickness of 5 to 15 mm, a light guide plate, and display means arranged on the light emitting surface of the light guide plate. The dimensions are 200 mm to 250 mm, the discharge path length is 400 mm to 500 mm, and the tube diameter is 2 to 5 mm. Both electrode parts are formed on one end side and discharge bent parts are formed on the other end side so that the discharge conduit line is bent. Since a cold cathode fluorescent lamp having a translucent airtight container is used, the light of the cold cathode fluorescent lamp is efficiently guided to the light guide plate, and compared with the cold cathode fluorescent lamp in which the discharge conduit is linearly formed. As a result, the luminous flux entering the light guide plate increases. Therefore, the total luminous flux of the cold cathode fluorescent lamp is 80 to 250 lm, and the average luminance of the display means is 250 to 800 cd / m ² defined by the guide light standard.

According to the third aspect of the present invention, in addition to the function of the first or second aspect, the cold cathode fluorescent lamp has a total luminous flux of 40 to 60 lm in an emergency and the average brightness of the display means. Is 100 to 300 cd specified by the guide light standard
/ m ²

In addition to the function of the guide light according to any one of claims 1 to 3, the guide light according to claim 4 includes a plurality of cold cathode fluorescent lamps, and the cold cathode fluorescent lamps are provided on opposite peripheral surfaces of the light guide plate. Since it is provided, the average brightness of the display means is improved and the brightness of the entire surface of the display means is made uniform.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the first embodiment of the guide light of the present invention will be described below with reference to FIGS.

In FIG. 1 and FIG. 2, reference numeral 11 denotes an instrument main body, which is formed in a horizontally long frame shape, and inside of which is not shown, a normal inverter, an emergency inverter, a secondary battery. And lighting parts such as terminal blocks are stored.

Reference numeral 12 denotes a light guide plate. The light guide plate 12 is made of an acrylic plate having vertical and horizontal dimensions of approximately 200 mm × 200 mm and a thickness of 5 to 15 mm. The light emitting surface 14 is formed on the other side, and dot-printed or prismatic light diffusing and reflecting layer is formed on the other side and a reflecting sheet.
15 is pasted.

A resin case 16 for housing the light guide plate 12 is attached to the light guide plate 12. The resin case 16 is made of a translucent resin, is formed in a frame shape that opens upward, and a pictogram 18 showing the evacuation direction as a display means is displayed on the display surface 17 corresponding to the light exit surface 14 of the light guide plate 12. It is drawn.

A cold cathode fluorescent lamp 19 is arranged facing the light incident surface 13 of the light guide plate 12. This cold cathode fluorescent lamp 19
Has a pipe length of 200 mm to 250 mm and a pipe diameter of 2 to 5
mm, input power is 2 to 4 W, input current is 4 to 10 mA, and input voltage is 300 to 500 V. And, the cold cathode fluorescent lamp at the time of normal lighting, which is lit by the commercial power source.
The total luminous flux of 19 is 80 to 120 lm, and the total luminous flux of the cold cathode fluorescent lamp 19 in an emergency when turned on by the secondary battery is 40 to 60 lm. By using this cold cathode fluorescent lamp 19, the light guide plate 12 can be made thin and compact, and at the same time, it is possible to save power and reduce the capacity of the secondary battery.

A reflector 20 is attached to the upper part of the light guide plate 12 so as to enclose the cold cathode fluorescent lamp 19, and the light of the cold cathode fluorescent lamp 19 is guided to the light incident surface 13 of the light guide plate 12 by the reflector 20. Is configured.

The light guide plate 12 and the upper part of the resin case 16 are attached to the instrument body 11, and the cold cathode fluorescent lamp 19 and the reflector 20 are arranged in the instrument body 11.

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

During normal lighting, the cold cathode fluorescent lamp 19 is lit by a commercial power source. When the cold cathode fluorescent lamp 19 is turned on, the light emitted from the cold cathode fluorescent lamp 19 is reflected directly and by the reflector 20 to enter the inside from the light entrance surface 13 of the light guide plate 12, and the inside of the light guide plate 12 is reflected. The light incident on the light is diffusely reflected by the light diffusive reflection layer and the reflection sheet 15, and emitted from the light emitting surface 14 of the light guide plate 12. The light emitted from the light emitting surface 14 of the light guide plate 12 illuminates and displays the pictogram 18 drawn on the display surface 17 of the resin case 16.

FIG. 3 shows the relationship between the ratio of the thickness of the light guide plate 12 / the tube diameter of the cold cathode fluorescent lamp 19 and the relative brightness of the display surface 17, where the ratio of the thickness / tube diameter is 1 to 3. In the range of, the light of the cold cathode fluorescent lamp 19 is effectively guided to the light guide plate 12, and the display surface 17
It has been shown that the relative brightness of is relatively high. Therefore, the thickness of the light guide plate 12 is 5 to 15 mm, and the cold cathode fluorescent lamp is
By setting the tube diameter of 19 to be 2 to 5 mm, the plate thickness / tube diameter ratio falls within the range of 1 to 3, and the light of the cold cathode fluorescent lamp 19 is effectively guided to the light guide plate 12, and the display surface is displayed. The brightness of 17 can be increased.

FIG. 4 shows the relationship between the lamp current and the relative luminance. The light of the cold cathode fluorescent lamp 19 which is lit in the lamp current range of 4 to 10 mA is effectively guided to the light guide plate 12, It is shown that the relative brightness of the display surface 17 can be obtained relatively high. Therefore, using the cold cathode fluorescent lamp 19,
By setting the input current of the cold cathode fluorescent lamp 19 to 4 to 10 mA, the light of the cold cathode fluorescent lamp 19 is effectively guided to the light guide plate 12, and the brightness of the display surface 17 can be increased.

Therefore, the vertical and horizontal dimensions are approximately 200 mm × 20.
A light guide plate 12 having a thickness of 0 mm and a thickness of 5 to 15 mm is used, and a pipe length is 200 mm to 250 mm and a pipe diameter is 2
Since the guide light using the cold cathode fluorescent lamp 19 of ~ 5 mm can effectively guide the light of the cold cathode fluorescent lamp 19 to the light guide plate 12, the cold cathode fluorescent lamp 19 which is turned on by the commercial power source at the time of normal lighting. Has a total luminous flux of 80 to 120 lm, and the average luminance of the display surface 17 on which the pictogram 18 is drawn is 500 to 800 cd.
/ m ² , which is sufficient to meet the standard of guide lights.

Further, at the time of emergency lighting such as power failure, the cold cathode fluorescent lamp 19 is turned on by the secondary battery. And
At the time of emergency lighting, the total luminous flux of the cold cathode fluorescent lamp 19 lit by the secondary battery is 40 to 60 lm, and the pictogram 18
The average brightness of the display surface 17 on which is drawn is 100 to 300 cd / m ²
Therefore, it is possible to sufficiently satisfy the standard of the guide light.

Next, FIG. 5 shows a second embodiment. In this embodiment, the light guide plate 12, the resin case 16 and the cold cathode fluorescent lamp 19 are shown.
Double-sided display can be performed by using a pair of optical units composed of a reflector 20 and the reflector 20, and stacking their rear surfaces with their display surfaces 17 being outside.

Next, FIG. 6 shows a third embodiment. In this embodiment, two cold cathode fluorescent lamps 19 are provided and the light guide plate 12 is used.
Are arranged on the opposing circumferential surfaces of the respective. In this embodiment, the pair of cold cathode fluorescent lamps 19 arranged on both sides of the light guide plate 12 improves the average brightness of the display surface 17 and makes the brightness of the entire display surface 17 uniform.

Next, FIGS. 7 to 11 show a fourth embodiment. In this embodiment, two cold cathode fluorescent lamps 19 of a substantially U-shaped single-ended die are used.

In this cold cathode fluorescent lamp 19, both electrode parts 21 are arranged on one end side so that the discharge tube is bent in a substantially U shape, and a discharge bent part 22 is formed on the other end side. Has a glass tube 23 as a translucent airtight container, a base 24 is provided at one end of the glass tube 23, and a pair of pins 25 connected to the base 24 at the same potential as each electrode portion 21 are provided. It is projected. The tube length is 200 mm to 250 mm and the discharge path length is 40 mm.
0mm-500mm, pipe diameter dimension 2-5mm, input power is 2
~ 4W, input current 4 ~ 10mA, input voltage 600 ~ 1
It is set to 000V.

The total luminous flux of the cold cathode fluorescent lamp 19 during normal lighting which is lit by the commercial power source is 80 to 250 lm, and the total luminous flux of the cold cathode fluorescent lamp 19 during emergency which is lit by the secondary battery is It becomes 40-60lm. By using this cold cathode fluorescent lamp 19, the light guide plate 12 can be made thin and compact, and at the same time, it is possible to save power and reduce the capacity of the secondary battery.

The glass tube of the cold cathode fluorescent lamp 19
The length dimension 1 of 23 is substantially equal to the longitudinal dimension L of the light incident surface 13 of the light guide plate 12, and the width dimension b of the glass tube 23 of the cold cathode fluorescent lamp 19 is the thickness dimension B of the light incident surface 13 of the light guide plate 12. It is desirable to make it approximately equal to.

Sockets 26 are provided at both ends of the instrument main body 11 so that the glass tubes 23 of the cold cathode fluorescent lamps 19 are connected so that the parallel direction of the glass tubes 23 is parallel to the light entrance surface 13 of the light guide plate 12.
In addition, a lighting unit 27 including lighting components such as a normal inverter, an emergency inverter, a secondary battery, and a terminal block is provided in the instrument body 11.

Then, the light guide plate 12 is provided at the center of the resin case 16.
However, the reflectors 20 are provided at both ends of the light guide plate 12 and the reflecting surface 20 of the light guide plate 12.
Cold cathode fluorescent lamps 19 are provided between the cold cathode fluorescent lamps 19 and, the upper part of the resin case 16 is attached to the instrument body 11, and the base 24 of each cold cathode fluorescent lamp 19 is connected to the socket 26.

During normal lighting, both cold cathode fluorescent lamps 19 are lit by a commercial power source. When this cold cathode fluorescent lamp 19 is turned on, the light emitted from both cold cathode fluorescent lamps 19 is reflected directly and by the reflector 20 and enters the inside from both light incident surfaces 13 of the light guide plate 12, and the light guide plate 12 The light that has entered the inside is diffused and reflected by the light diffusing and reflecting layer and the reflecting sheet 15, and is emitted from the light emitting surface 14 of the light guide plate 12. The light emitted from the light emitting surface 14 of the light guide plate 12 illuminates and displays the pictogram 18 drawn on the display surface 17 of the resin case 16.

At this time, the effective light emission length of the cold cathode fluorescent lamp 19 which enters the light incident surface 13 of the light guide plate 12 is the length between the electrode portions 21 and the discharge bent portion 22, and is substantially Is equal to the length of the glass tube 23 of the cold cathode fluorescent lamp 19.

Also in this embodiment, as described above with reference to FIG. 3, the thickness of the light guide plate 12 is 5 to 1
By setting the tube diameter of the cold cathode fluorescent lamp 19 to 5 mm and the tube diameter of 2 to 5 mm, the plate thickness / tube diameter ratio falls within the range of 1 to 3, and the light of the cold cathode fluorescent lamp 19 is effectively applied to the light guide plate 12. By being guided, the brightness of the display surface 17 can be increased. Moreover, as described with reference to FIG. 4, by using the cold cathode fluorescent lamp 19 and setting the input current of the cold cathode fluorescent lamp 19 to 4 to 10 mA, the light of the cold cathode fluorescent lamp 19 is effectively applied to the light guide plate 12. The display surface 17 can be increased in brightness by being guided to.

Therefore, the vertical and horizontal dimensions are approximately 200 mm × 20.
The light guide plate 12 having a thickness of 0 mm and a thickness of 5 to 15 mm is used, the tube length is 200 mm to 250 mm, and the discharge path length is 4 mm.
The guide light using the cold cathode fluorescent lamp 19 of U-shaped single-ended die having a diameter of 00 mm to 500 mm and a tube diameter of 2 to 5 mm can effectively guide the light of the cold cathode fluorescent lamp 19 to the light guide plate 12. Since the light flux entering the light guide plate 12 can be increased as compared to a double-ended cold cathode fluorescent lamp in which the glass tube is formed in a straight line, the cold cathode fluorescent lamp is turned on by a commercial power source during normal lighting. The total luminous flux of the lamp 19 is 80 to 250 lm,
The average brightness of the display surface 17 on which the pictogram 18 is drawn is 250.
It is up to 800 cd / m ² , and it is possible to sufficiently satisfy the guide light standard.

Further, since the cold cathode fluorescent lamp 19 is a single-ended die and the die body 24 is opposed to the light guide plate 12 toward the instrument body 11, electrical wiring can be performed only in the instrument body 11. Moreover, at the time of starting, since the wiring of the cold cathode fluorescent lamp 19 to which a relatively high voltage is applied is not performed to a position away from the instrument body 11, no special insulation treatment or an outer frame for wiring is required, It is possible to provide a safe guide light with reduced manufacturing cost.

Further, in order to increase the luminous flux of light entering the light guide plate 12, the incident surface 13 of the light guide plate 12 is larger than that of the cold cathode fluorescent lamp in which the diameter of the glass tube is increased to increase the luminous flux. Since the glass tube 23 is installed to face the entire width dimension B of the
It is possible to obtain a display surface with uniform brightness without unevenness in brightness without lowering the brightness of the light emitting surface 14 in the vicinity of.

During an emergency lighting such as a power failure, the cold cathode fluorescent lamp 19 is turned on by the secondary battery. And
At the time of emergency lighting, the total luminous flux of the cold cathode fluorescent lamp 19 lit by the secondary battery is 40 to 60 lm, and the pictogram 18
The average brightness of the display surface 17 on which is drawn is 100 to 300 cd / m ²
Therefore, it is possible to sufficiently satisfy the standard of the guide light.

Moreover, since the two cold cathode fluorescent lamps 19 are provided on the light-entering surfaces 13 of the light guide plate 12 facing each other, the average brightness of the display surface 17 is improved and the display surface 17 is improved.
The brightness of the entire surface of 17 becomes uniform.

Next, FIG. 12 shows a fifth embodiment. In this embodiment, the glass tubes 23 of the cold cathode fluorescent lamp 19 are arranged so that the parallel direction is orthogonal to the light entrance surface 13 of the light guide plate 12. To be done.

By disposing the cold cathode fluorescent lamp 19 on the light guide plate 12 in this manner, the width dimension B of the light entrance surface 13 can be adjusted to the glass tube 23 without changing the amount of light entering the light guide plate 12. Since it can be made as thin as the diameter d, the light guide plate 12 can be made thin,
Product costs can be further reduced, and the guide light itself can be made lighter and smaller.

Next, FIGS. 13 and 14 show other examples of the cold cathode fluorescent lamps 19, respectively, and the respective embodiments can be realized by using these cold cathode fluorescent lamps 19.

In the cold cathode fluorescent lamp 19 shown in FIG. 13, two glass tubes 23 having the same size are arranged in parallel and
In order to form a discharge conduit between the two electrode portions 21 of 23, the end tube walls of the glass tube 23 in the opposite direction from both electrode portions 21 are spatially connected by a bridge tube to form a discharge bent portion 22. ing.

The cold cathode fluorescent lamp 19 shown in FIG. 14 is formed by airtightly adhering plate-shaped glass to form a discharge space, and the discharge bent portion 22 is such that the discharge conduit between both electrode portions 21 is continuous. A partition plate 23a is formed along the longitudinal direction of the glass tube 23 at an intermediate portion in the lateral direction.

If the dimensions of the cold cathode fluorescent lamp 19 shown in FIGS. 13 and 14 are set as in the above-mentioned embodiment, it is possible to obtain an induction lamp having the same function and effect.

When illuminance is required on the lower surface of the guide lamp, a cold cathode fluorescent lamp having a relatively high luminance at the discharge bent portion is used, and its lower part is covered with a translucent case.
Light entering the light guide plate is also uniform in the longitudinal direction, and effective lower surface illuminance is obtained. Further, when a cold cathode fluorescent lamp having a relatively high brightness at the discharge bent portion is used, it has an effect of compensating for a decrease in brightness at the light emitting surface near the corners of the light entering surface of the light guide plate, which becomes relatively dark.

The light guide plate is not limited to the one integrally molded of acrylic, but may be a stack of a plurality of acrylic plates or a light guide body filled with a light guide liquid. Any light guide plate having a surface can be applied.

In the above embodiment, the number of cold cathode fluorescent lamps is one or two, but the desired average brightness can be obtained according to optical conditions such as the light transmittance of the light guide plate. The number of cold cathode fluorescent lamps may be set.

[0053]

According to the guide lamp of the first aspect of the present invention, there is provided a light guide plate having vertical and horizontal dimensions of about 200 mm × 200 mm and a thickness of 5 to 15 mm, and display means arranged on the light emitting surface of the light guide plate. Since the cold cathode fluorescent lamp with a tube length of 200 mm to 250 mm and a tube diameter of 2 to 5 mm is used, the light of the cold cathode fluorescent lamp can be effectively guided to the light guide plate, and the total luminous flux of the cold cathode fluorescent lamp is used. Is 80 to 120 lm, the average brightness of the display means is 500 to 800 cd / m ² , and the standard of the guide light can be sufficiently satisfied.

According to the second aspect of the present invention, there is provided a light guide plate having vertical and horizontal dimensions of approximately 200 mm × 200 mm and a thickness of 5 to 15 mm, and display means arranged on the light emitting surface of the light guide plate. , The tube length is 200 mm to 250 mm, the discharge path length is 400 mm to 500 mm, the tube diameter is 2 to 5 mm, both electrode parts are on one end side, and the discharge bent part is on the other end side so that the discharge conduit is bent. Since a cold cathode fluorescent lamp having a translucent airtight container in which is formed is used, the light of the cold cathode fluorescent lamp can be efficiently guided to the light guide plate, and the cold cathode fluorescent lamp in which the discharge conduit is formed in a straight line is formed. The luminous flux entering the light guide plate can be increased as compared with the lamp, and the total luminous flux of the cold cathode fluorescent lamp is 80
.About.250 lm and the average brightness of the display means is 250 to 8
Since it is 00 cd / m ² , the standard of the guide light can be sufficiently satisfied.

According to the guide light of claim 3, claim 1
Alternatively, in addition to the effect of the guide light described in 2, in an emergency, the total luminous flux of the cold cathode fluorescent lamp is 40 to 60 lm, and the average brightness of the display means is 100 to 300 cd / m ² , and the standard of the guide light is sufficient. Can be satisfied with.

According to the guide light of claim 4, claim 1
In addition to the effect of the guide light described in any one of 1 to 3, since a plurality of cold cathode fluorescent lamps are provided on the opposing peripheral surfaces of the light guide plate, the average brightness of the display means is improved. At the same time, the brightness of the entire surface of the display means becomes uniform.

[Brief description of drawings]

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

FIG. 2 is a front view of the embodiment.

FIG. 3 is a graph showing the relationship between the plate thickness / tube diameter ratio and the relative brightness of the display surface in the above example.

FIG. 4 is a graph showing the relationship between the lamp current and the relative luminance in the above-mentioned embodiment.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a perspective view of a fourth embodiment of the present invention in an exploded state.

FIG. 8 is a perspective view of the above embodiment in an assembled state.

FIG. 9 is a side view of the cold cathode fluorescent lamp of the above embodiment.

FIG. 10 is a sectional view of the above embodiment.

FIG. 11 is a sectional view of the embodiment.

FIG. 12 is a sectional view showing a fifth embodiment of the present invention.

FIG. 13 is a side view showing another cold cathode fluorescent lamp.

FIG. 14 is a perspective view showing still another cold cathode fluorescent lamp.

[Explanation of symbols] 12 Light guide plate 13 Light incident surface 14 Light exit surface 18 Pictogram as display means 19 Cold cathode fluorescent lamp 21 Electrode portion 22 Discharge bent portion 23 Glass tube as translucent airtight container

Claims (4)

[Claims] 1. A vertical and horizontal dimension is approximately 200 mm × 200, with at least one side surface serving as a light exit surface and one circumferential surface serving as a light entrance surface.
mm, a thickness of 5 to 15 mm, a display means disposed on the light exit surface of the light guide plate, and a light guide surface of the light guide plate having a tube length of 200 mm to
A cold cathode fluorescent lamp having a diameter of 250 mm and a tube diameter of 2 to 5 mm, and the total luminous flux of the cold cathode fluorescent lamp is 80 to 120 lm.
And the average brightness of the display means is 500 to 800 cd
Guide light characterized by being / m ² . 2. A vertical and horizontal dimension is approximately 200 mm × 200, wherein at least one side surface is a light exit surface and one circumferential surface is a light entrance surface.
mm, a thickness of 5 to 15 mm, a display means disposed on the light exit surface of the light guide plate, and a light guide surface of the light guide plate having a tube length of 200 mm to
250 mm, discharge path length is 400 mm to 500 mm, tube diameter dimension is 2 to 5 mm, both electrode parts are formed on one end side and discharge bent parts are formed on the other end side so that the discharge conduit is bent. A cold cathode fluorescent lamp having a gas-tight container, the total luminous flux of the cold cathode fluorescent lamp is 80 to 250 lm, and the average brightness of the display means is 250 to 800 cd / m ^2. light. 3. In an emergency, the total luminous flux of the cold cathode fluorescent lamp is 40 to 60 lm, and the average brightness of the display means is 100 to 10.
^{3. The method according} to claim 1, wherein the speed is 300 cd / m 2.
Guide light described. 4. The guide lamp according to claim 1, wherein the cold cathode fluorescent lamp is a plurality of lamps, and the cold cathode fluorescent lamps are provided on respective opposing peripheral surfaces of the light guide plate.