KR101774338B1

KR101774338B1 - Luminescence Guide Device

Info

Publication number: KR101774338B1
Application number: KR1020150184992A
Authority: KR
Inventors: 곽준섭; 이동규; 박현정
Original assignee: 순천대학교 산학협력단
Priority date: 2015-12-23
Filing date: 2015-12-23
Publication date: 2017-09-04
Also published as: KR20170075388A

Abstract

A light emitting guide device according to the present invention includes a housing part including a display area for displaying guide information, a light source part provided inside the housing part to emit light, a guide path of light emitted from the light source part, An internal total reflection lens having a reflecting surface and an emitting surface, and an end surface provided on the emitting surface, and the other end surface is provided in a part of the display area, and transmits light emitted from the emitting surface to the display area And includes a plurality of optical fibers.

Description

[0001] Luminescence Guide Device [0002]

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a light emitting guide device, and more particularly to a light emitting guide device with improved visibility.

2. Description of the Related Art [0002] In general, a light emitting guide device is a type of apparatus that is manufactured for enhancing visibility for a driver or a user, and is used variously for advertisement devices such as various roads and signboards.

In the conventional light emitting guide device, an optical fiber is used to transmit light to the display area, and a connector for fixing and connecting the light source unit and the optical fiber is used to increase the efficiency of transmitting light emitted from the light source unit to the optical fiber. However, the light emitted from the light source part is incident on the connector, and the light incident on the connector wall is likely to disappear, so that light emitted from the light source part is not efficiently transmitted to the optical fiber.

In addition, the display area is illuminated by the light having the same optical characteristics without considering the visibility of the driver due to changes in the external environment such as bad weather, snowfall, fog, etc., There is a phenomenon in which light is diffused and it is difficult for the user to recognize.

KR1999-0083973A

The present invention provides a light emitting guide device capable of effectively transmitting light emitted from a light emitting diode through a light source portion, an internal total reflection lens, and an optical fiber to an optical fiber by an internal total reflection lens, and improving visibility according to an external environment change.

A light emitting guide device according to the present invention includes: a housing part including a display area for displaying guide information; A light source unit provided inside the housing unit and emitting light; An internal total reflection lens for guiding a traveling path of light emitted from the light source unit and having an incident surface, a reflection surface, and an emission surface; And a plurality of optical fibers which are provided on the exit surface and whose other end is provided in a part of the display area and which transmits the light emitted from the exit surface to the display area.

Wherein the total internal reflection lens includes a concave portion that receives the light source portion, the concave portion includes a first incident surface that faces the light source portion and includes a convex surface protruding toward the light source portion; And a second incident surface provided around the light source unit.

The convex surface protruding toward the light source portion of the first incident surface may be aspherical.

The reflection surface of the total internal reflection lens is formed on a side surface of the total internal reflection lens, and may form at least a part of the parabolic shape.

The exit surface of the total internal reflection lens may be formed in a plane shape in front of the total internal reflection lens.

The light source unit may include a light emitting diode that emits white light.

Wherein the light source unit comprises: a first light emitting diode emitting white light of a first color temperature; And a second light emitting diode that emits white light of a second color temperature lower than the first color temperature.

And a visibility measuring unit for measuring visibility in accordance with changes in the external environment.

The visibility measuring unit may include at least one of an illuminance sensor for sensing illumination, a rain sensor for sensing moisture, and a camera for acquiring an image of an external environment.

And a control unit for controlling the light source unit according to the visibility measurement value sensed by the visibility measurement unit.

And a transparent resin adhesive layer provided between the exit surface of the total reflection lens unit and one end surface of the optical fiber.

The refractive index of the transparent resin adhesive layer may be 1.3 to 1.65.

One end of the optical fiber may be inserted into the transparent resin adhesive layer.

The light emitted from the light source unit is guided to the parallel light while passing through the total internal reflection lens and the light guided to the parallel light is incident on the exit face of the total internal reflection lens and the end face of the optical fiber at an angle So that it can be effectively incident on the optical fiber through the total internal reflection lens, thereby reducing the loss of light. That is, since the loss of light can be reduced by the present invention, the energy can be saved, and the optical transmission efficiency can be improved by the total internal reflection lens, so that a material having a relatively low cost can be used for the optical fiber, . Further, the energy consumption power used for the light emission can be reduced to further extend the service life of the product.

When visibility changes according to the external environment, a plurality of light emitting diodes having different color temperatures can be selectively operated to improve visibility. Accordingly, when the light emitting diodes are used in a guide sign, It is possible to confirm the guide signs well even in the weather of the day, and it is possible to prevent the accident. On the other hand, when used in advertising devices such as signboards, it can be made more noticeable than conventional advertising devices even in the weather of a long distance, bad weather, snowfall, and mist.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a schematic view showing the structure of a light emitting guide according to an embodiment of the present invention; FIG.
1B is a cross-sectional view showing the inside of the housing according to the embodiment of the present invention.
2 is a cross-sectional view illustrating a light source unit, an internal total reflection lens, and an optical fiber according to an embodiment of the present invention.
3 is a cross-sectional view illustrating an internal total internal reflection lens according to an embodiment of the present invention.
4 is a plan view showing a configuration of a light source unit according to an embodiment of the present invention.
5 is a cross-sectional view showing a coupling relationship between a resin adhesive layer and an optical fiber according to another embodiment of the present invention.
6 is a graph showing a change in light transmission efficiency of a light emitting guide according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. In the description, the same components are denoted by the same reference numerals, and the drawings are partially exaggerated in size to accurately describe the embodiments of the present invention, and the same reference numerals denote the same elements in the drawings.

1B is a cross-sectional view illustrating the inside of a housing according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a light guide unit according to an embodiment of the present invention. An internal total reflection lens, and an optical fiber, and FIG. 3 is a cross-sectional view illustrating an internal total internal reflection lens according to an embodiment of the present invention.

Referring to FIGS. 1A to 3, the light emitting device according to the present invention includes a housing part 110 including a display area 120 for displaying guidance information; A light source unit 400 provided inside the housing unit 110 and emitting light; An internal total reflection lens 300 for guiding the path of light emitted from the light source unit 400 and having an incident surface 310, a reflection surface 320, and an emission surface 330; And one end surface is provided on the exit surface 330 and the other end surface is provided in a part of the display area 120 and a plurality of optical fibers for transmitting light emitted from the exit surface 330 to the display area (200).

The housing unit 110 may include a display area 120 provided on at least one side of the display unit 120 to display guidance information such as traffic information or degree of advertisement and may include an optical fiber 200, an internal total internal reflection lens 300 and a light source unit 400 And the plurality of optical fibers 200 may be connected to part or all of the display area 120 that is regularly or irregularly arranged and fixed within the housing part 110.

The light source unit 400 provides light to illuminate the guidance information of the display area 120 so that guidance information of the display area 120 can be effectively recognized even in an external environment with poor visibility. The light source unit 400 may be a fluorescent lamp, an incandescent lamp, a light emitting diode, or a combination thereof.

The light emitted from the light source unit 400 is incident into the total internal reflection (TIR) lens 300, is refracted or reflected, and is guided to exit from the parallel light state. At this time, it is not necessary that the emitted light is completely parallel light, but it is sufficient if the light can be efficiently directed so as to pass through the emission surface.

The total internal reflection lens 300 is a lens that is totally reflected at a boundary surface when the incident angle of light (angle between the direction of incidence of light and the normal line of the interface) is greater than a critical angle when the light advances from a medium having a high refractive index to a medium having a low refractive index. Generally, in a medium having a high refractive index, light propagates to a medium having a low refractive index, and a part of the light is transmitted through the interface and partially reflected. However, as the incidence angle of light increases, all the light is reflected at the interface of the medium when the angle exceeds a specific angle. This can be called total internal reflection. The total internal reflection lens can be made of transparent glass, optical plastic, optical resin or the like. The refractive index of these materials is 1.3 to 1.65 (for example, the refractive index of glass is 1.52), and the light is transmitted to the interface between the internal total reflection lens and air When the incident angle is larger than a threshold value (for example, the threshold value of glass is 41 degrees), total reflection occurs.

Since the light emitted from the light source unit 400 is incident on the internal total internal reflection lens 300 which is a medium having a high refractive index through the air having a low refractive index and is incident on the incident plane 310 of the total internal reflection lens 300, The total internal reflection lens 300 enters the inside of the total internal reflection lens 300 while being refracted or straightened. Some of the light emitted from the light source 400 toward the front in a direction relatively parallel to the optical axis travels toward one end surface of a plurality of optical fibers 200 described later and the remaining light among the light emitted from the light source 400 The light is refracted or straightened on the incident surface 310 and directed to the reflecting surface 320 of the total internal reflection lens 300. The reflective surface 320 is formed on a side surface of the total internal reflection lens having a sectional area expanded toward the front of the light source 400 so that the light directed toward the reflective surface 320 is incident at an incident angle So that all the light is totally reflected toward the front. When the light source unit 400 is positioned at or near the focal point of the parabolic surface formed by the reflective surface 320, the reflective surface 320 on which the total internal reflection occurs may be at least a part of the parabolic surface shape. (Not shown) parallel to the optical axis on the reflecting surface 320. [0157]

The light reflected by the reflecting surface 320 at the reflecting surface 320 is incident on the emitting surface 330 which is located in front of the light source 400 and crosses the optical axis at an incident angle smaller than the critical angle of the total internal reflection lens 300, It is possible to escape the total internal reflection lens 300 without total reflection. For example, when the emission surface 330 is formed perpendicular to the optical axis, the light reflected by the reflection surface 320 is incident on the emission surface 330 almost vertically (almost '0' incident angle) The total reflection lens 300 is escaped and enters the optical fiber. On the other hand, since the parallel light that is reflected from the reflection surface 320 and is substantially parallel to the optical axis is incident on the emission surface 330, the emission surface 330 is formed in a planar shape so that all the light incident on the emission surface 330 It is possible to easily adjust the incident angle to be smaller than the critical angle of the total reflection lens 300. Furthermore, as compared with producing the emission surface 330 in a complicated structure, the emission surface in a planar shape can be manufactured at a low cost.

Since the total internal reflection lens 300 is disposed between the light source unit 400 and the plurality of optical fibers 200, the incident total reflection lens 300 is incident on the exit face of the total internal reflection lens 300 at an incident angle smaller than the threshold value, Light is incident into the plurality of optical fibers 200 through one end face of the plurality of optical fibers 200 provided on the emission face 330. The light incident into the plurality of optical fibers 200 is transmitted through the plurality of optical fibers 200 and is emitted to the other end surface of the plurality of optical fibers 200 provided in at least a part of the display region 120.

The optical fiber has a core having a large refractive index at its center and a cladding having a small refractive index surrounding the core. The light incident on one end of the optical fiber core continues to propagate through the interface between the core and the cladding. The optical fiber transmits light from one side to the other through total internal reflection. Light reflects along the inner wall through total internal reflection even if the optical fiber is curved. That is, when light is incident into the optical fiber, it is theoretically impossible to generate optical loss due to total internal reflection, so it is important to transmit light into the optical fiber without loss of light.

When light passes through the interface of a medium having a different refractive index, it passes through the interface or is reflected depending on the incident angle to the interface. In general, when the incident angle of light is small (when the angle with respect to the normal to the interface is small), light easily passes through the interface, whereas when the incident angle of light is large, the light is reflected in the opposite direction from the interface, A light loss (fresnel loss) may occur.

Since the light escaping from the exit surface of the total internal reflection lens 300 is incident on the exit surface 330 at an incident angle smaller than the critical angle and escapes, So that a large amount of light loss due to reflection at one end face of the optical fiber can be introduced into the inside of the optical fiber. Further, when the exit surface 330 of the total internal reflection lens 300 is formed so as to be perpendicular to the optical axis, the light reflected by the parallel light substantially parallel to the optical axis by the reflection surface 320 forming the parabolic surface is incident on the exit surface 330 It is possible to make the light incident on the one end face of the optical fiber almost perpendicularly or at a small incident angle, since the light is incident almost perpendicularly (the incident angle is close to '0'). One end face of the plurality of optical fibers 200 is provided parallel to the exit face 330 so that light escaping from the exit face 330 of the total internal reflection lens 300 can be incident on one end face of the optical fiber without a large light loss .

The present invention optically couples the light source unit 400 and the plurality of optical fibers 200 as the total internal reflection lens 300 so that the light emitted from the light source unit 400 is efficiently transmitted to the plurality of optical fibers 200 And the light energy transfer efficiency can be improved.

The plurality of optical fibers 200 may be made of transparent glass, optical plastic, or optical resin. In the case of glass, the optical characteristics are very excellent. However, there is a disadvantage in that a high technology is required for connection between the optical fibers, In the case of optical plastic or resin products, the optical characteristics are good, the workability is good, and the position can be easily adjusted or connected without being influenced by the electric noise. According to the present invention, since the light transmission efficiency between the light source part and the optical fiber is very high, a plastic optical fiber (POF) can be used as the optical fiber. The core may be formed of polystyrene, polymethylmethacrylate, polycarbonate or the like, and the clad portion may be formed of a silicone resin, a fluororesin or the like.

Light incident through one end face of the plurality of optical fibers 200 is transmitted through the optical fiber and is emitted through the other end face provided in at least a part of the display region 120 so that the traffic information to be displayed in the display region 120 The visibility of the guide information such as the degree of advertisement can be increased.

The total internal reflection lens 300 according to another embodiment of the present invention may include a concave portion 340 that receives the light source portion 400 at a rear end portion thereof. The concave portion 340 may include a first incident surface 311 that includes a convex surface protruding toward the light source portion 400 and opposes the light source portion 400, ; And a second incident surface 312 provided around the light source 400.

When the light source unit 400 is accommodated in the concave portion 340 and the light is emitted forward or laterally, the emitted light passes through the air existing in the inner space of the concave portion 340, 1 incident surface to the second incident surface 311, 312, respectively. A reflection surface (not shown) may be further added to the rear of the light source 400 to remove light that escapes the recess 340. Even if reflection occurs at the interface between the low refractive index air and the high refractive index total internal reflection lens 300, the light can be incident on the incident surface 310 of the other region via the inner space of the concave portion 340, It is possible to effectively enter the total internal reflection lens 300 without light loss.

Light emitted forward from the light source unit 400 is refracted or straightened while passing through the convex surface included in the first incident surface 311 facing the light source unit 400 and incident on the emitting surface 330 at an incident angle smaller than the critical angle . The convex surface of the first incident surface 311 may be provided in an aspherical shape. When the light emitted from the light source unit 400 passes through the first incident surface 311 of the aspherical shape, the air and the total internal reflection lens 300 (Approximately '0' incident angle) at the interface between the exit surface 330 and the exit surface 330 so that the exit surface 330 can pass through the exit surface 330 effectively without light loss can do. At this time, the light source unit 400 may be provided at the focus of the aspherical convex lens.

Light emitted laterally from the light source unit 400 is incident on the second incident surface 312 of the total internal reflection lens 300. The light incident on the second incident surface 312, which is the interface between the air and the total internal reflection lens 300, Advances while being refracted, and enters the parabolic reflecting surface 320 at an incident angle larger than the critical angle. The light reflected by the parabolic reflection surface 320 can be converted into parallel light that is substantially parallel to the optical axis and incident on the emission surface 330 almost perpendicularly (with an incident angle of substantially zero).

In the present invention, the light emitted from the light source unit 400 is refracted by the first incident surface 311 including the convex surface of the aspherical shape, or reflected by the reflecting surface 320 of the parabolic shape passing through the second incident surface 312 The light can be converted into parallel light that is substantially parallel to the optical axis and can proceed to be incident on the exit surface 330 almost perpendicularly (at an incident angle of substantially '0'). This allows the light emitted from the light source 400 to pass through the exit surface 330 and one end surface of a plurality of optical fibers without loss of light and effectively enter the inside of the optical fiber. One end surface of the emitting surface 330 and one end surface of the plurality of optical fibers 200 may be formed in a planar shape and one end surfaces of the emitting surface 330 and the optical fiber 200 may be provided parallel to each other.

5 is a cross-sectional view illustrating a coupling relationship between a resin adhesive layer and an optical fiber according to another embodiment of the present invention, and Fig. 6 is a cross- FIG. 5 is a graph showing a change in light transmission efficiency of the light guide apparatus according to the present invention. FIG.

4 to 6, the light emitting guide device according to the present invention includes an optically transparent resin adhesive layer 500 provided between the exit surface 330 of the total internal reflection lens 300 and one end surface of a plurality of optical fibers 200 . The resin adhesive layer 500 is formed of a light transmitting resin material having a refractive index of 1.3 to 1.65 (for example, an epoxy resin, a silicone resin, a polycarbonate (PC), an UV (ultraviolet ray) curing resin, and a polymethyl methacrylate ).

When one end face of the plurality of optical fibers 200 is provided on the exit face 330 of the total internal reflection lens 300, an air layer exists between one end face of the optical fiber and the exit face. Therefore, in order to emit light from the exit surface 330 and enter the one end face of the optical fiber, an internal total reflection lens of high refractive index (1.3 to 1.65), an air layer of low refractive index (1), and an optical fiber of high refractive index . When light passes through the interface of a medium having a different refractive index, light may not be reflected and transmitted through the interface depending on the angle of incidence on the interface, and a large loss of light (Fresnel loss) may occur. Fresnel loss may be generated at the interface between the total reflection lens and the air layer, and between the air layer and one end face of the optical fiber. On the other hand, a resin bonding layer 500 made of a resin material having a refractive index of 1.3 to 1.65 is inserted between the internal total reflection lens 300 and one end face of the plurality of optical fibers 200 to adhere one end face of the optical fiber to the exit face 330 It is possible to remove the air layer existing in the middle, so that the light travels through different media and can proceed without a large change in the refractive index. Therefore, Fresnel loss can be effectively reduced in the process of transmitting light from the total internal reflection lens to the optical fiber . On the other hand, when the total internal reflection lens and the optical fiber are formed of an optical plastic or an optical resin, the refractive index can be controlled very similar to the material homogeneity with the resin adhesive layer, thereby further reducing the fresnel loss.

6, a change in coupling efficiency according to a method of optically coupling the light source unit 400 and the plurality of optical fibers 200 can be confirmed. The ratio of the amount of light incident into the plurality of optical fibers with respect to the amount of light emitted from the light source unit 400 is defined as the coupling efficiency. In the comparative example, a conventional light source unit and a plurality of optical fibers are simply coupled by a connector. In Embodiment 1, a light source unit and a plurality of optical fibers are combined as an internal total reflection lens 300 (refer to FIG. 2) A plurality of optical fibers are combined as an internal total reflection lens 300 and a resin adhesive layer 500 (see FIG. 4). In the comparative example, the coupling efficiency (or light transmission efficiency) was 71.9%, but in the case of Example 1 according to the present invention, it was confirmed that the coupling efficiency was 85.2% and the efficiency was improved by about 14%. In the case of Example 2, the bonding efficiency is 93.6%, and the Fresnel loss can be suppressed by the resin adhesive layer 500 as compared with Example 1, so that the efficiency of about 8% p can be additionally improved.

The resin adhesive layer 500 may be formed of an epoxy cured resin (refractive index of 1.3 to 1.65), a silicone hardened resin (refractive index of 1.3 to 1.65), or a UV hardened resin (refractive index of 1.47 to 1.62) It is possible to easily optically couple (couple) the output surface 330 with one end surface of the optical fiber. In the case of using the resin adhesive layer, it is possible to transmit light into the optical fiber in a simple manner without providing the exit face of the total internal reflection lens and one end face of the optical fiber in parallel in order to reduce Fresnel loss.

In the case where one end face of the plurality of optical fibers 200 is formed not to be perpendicular to the longitudinal direction of the optical fiber but is formed to be inclined or uneven, the entire end face can not be adhered and fixed by the resin adhesive layer 500, The cross section of the optical fiber 500 and the optical fiber may be partially spaced. In order to solve such a problem, one end of a plurality of optical fibers 200 may be inserted and adhered to a transparent resin adhesive layer 500. In this case, one end face of the plurality of optical fibers 200 is positioned inside the resin adhesive layer 500 The whole surface can be adhered in complete contact with the resin adhesive layer.

The light source unit 400 may include a light emitting diode that emits white light (see FIG. 4). In order to easily identify the guide information provided in the display area, white light may be used to increase discrimination power while conveying the original color of the guide information. In the case of a light emitting diode, it is possible to emit light mainly toward the front of the light source unit 400, and to easily enter the inside of the total internal reflection lens 300. The light source unit 400 includes a first light emitting diode 410 emitting white light of a first color temperature; And a second light emitting diode 420 that emits white light of a second color temperature lower than the first color temperature. In addition, the light source unit 400 may further include a light emitting diode that emits light representing a color other than white light (for example, red) in order to improve the visibility of the guide information provided in the display area.

The color temperature is a numerical value used for displaying chromaticity of a light source having a blackbody radiation or a spectral distribution close to this. The chromaticity of light by blackbody radiation at various temperatures is indicated by a curve in the chromaticity diagram, which is called the blackbody trace. Assuming that a chromaticity point (point representing chromaticity coordinates) of a light source coincides with a point on the blackbody locus, the temperature corresponding to the point is the color temperature of the light source. In a normal light source, the spectral distribution is different from that of the blackbody radiation. Therefore, when the chromaticity point falls from the blackbody trace, the temperature corresponding to the point on the blackbody trace nearest to the chromaticity sensibly at the chromaticity point is called the color temperature of the light source. The higher the color temperature, the greener the color. The lower the color temperature, the more reddish the color.

The first light emitting diode 410 emits white light having a first color temperature of 5,000K to 6,000K and the second light emitting diode 420 emits white light having a color temperature of 3,000K to 4,000K lower than the first color temperature . White light having a color temperature of about 3,000K to 4,000K exhibits yellowish white as a white light having a yellow light emission characteristic. The first color temperature and the second color temperature do not need to be limited to the above-mentioned specific temperature, and different color temperatures are sufficient. On the other hand, in the case of a light emitting diode, white light of various color temperatures can be realized by changing the lamination structure or composition (composition) of the light emitting semiconductor layer, or changing the kind of the phosphor or the like. The light efficiency of a light emitting diode that emits white light of a first color temperature of 5,000K to 6,000K is generally in the range of 3,000K to 4,000K because of the difference in the light extraction efficiency of the semiconductor layered structure or the light conversion efficiency of the phosphor, Is higher than the light efficiency of the light emitting diode that emits light. Phosphors are used for white light emitting diodes. The light striking the phosphors is scattered and absorbed, which affects the light extraction efficiency. Further, the color temperature varies depending on the concentration of the phosphor. In the case of a light emitting diode that emits white light of a first color temperature and emits white light of a second color temperature lower than the first color temperature in the case of a light emitting diode that emits white light of a first color temperature, The efficiency of the diode becomes higher.

The first light emitting diode and / or the second light emitting diode can be selectively emitted according to the change of the external environment to improve the visibility of the user. For example, when it is difficult to identify the light emitting guide device due to backlight during the day, it is possible to emit a plurality of first light emitting diodes having high light efficiency, and it is easy to identify even if there is not a high light amount at night, . On the other hand, in the case where there is bad weather such as fog, rain, or snow, the visibility of the guide device deteriorates sharply. Even if white light having a first color temperature of 5,000K to 6,000K is emitted by the first light emitting diode, There may be a problem that the effect of visibility improvement is reduced by half due to stray fog or the like. When the visibility is poor due to fog, snow, rain or the like, the second light emitting diode is additionally or solely operated to emit yellowish white light having a color temperature of 3,000 K to 4,000 K, Identification can be facilitated even in this state. Generally, a white light having a first color temperature of 5,000K to 6,000K has a color spectrum of a short wavelength band, and therefore, it is difficult to detect a bad weather, fog, snow, etc. The scattered water droplets are scattered much and the permeability is particularly low. On the other hand, the yellowish white light having the second color temperature lower than the first color temperature having the spectrum of the long wavelength band has less scattering than the white light having the first color temperature, and the transmission visibility is improved. That is, in a general situation, if white light of a first color temperature having a high light efficiency is emitted and visibility is deteriorated due to bad weather, mist, rain, snow, etc., the white light of a second color temperature lower than the first color temperature may be emitted to increase visibility , It is possible to increase the visibility simultaneously with the light efficiency according to the change of the external environment.

The light guide apparatus according to the present invention may further include a visibility measuring unit 130 for measuring visibility in accordance with changes in the external environment caused by mist, snow, rain, and the like. The visibility measuring unit 130 may include at least one of an illuminance sensor for sensing an illuminance, a rain sensor for sensing moisture, and a camera for acquiring an image of an external environment. The visibility measuring unit 130 may include a visibility measuring unit And a control unit (not shown) for controlling the light source unit 400 according to the value.

The illuminance sensor can directly measure the illuminance of the external environment and measure the visibility. For example, day / night illumination in clear weather, day / night illumination in rainy weather, day / night illumination in snowy weather, night / day illumination in foggy weather, and visibility Can be measured.

The camera acquires the image of the external environment and analyzes the image to measure the visibility according to the external environment change. It is possible to classify frequency and brightness of a video image according to changes in the external environment such as clear weather, fog, rainfall, and snowfall, or to measure visibility using the sharpness of a boundary line in a video image of a subject such as a road lane.

The rain sensor can measure visibility by sensing minute moisture present in the mist, a little moisture due to snowfall, and a large amount of moisture in the rainfall.

The control unit (not shown) uses the visibility result value measured by the visibility measuring unit in accordance with the change of the external environment to selectively illuminate the first light emitting diode 410 and / or the second light emitting diode 420, Can be controlled. The control unit may detect current time information from a built-in timer or the like and utilize it for controlling the light source unit 400. [

The light emitting guide device according to the present invention may further include a solar cell 140 that generates electricity using sunlight, and a solar cell 150 that stores the generated electricity and supplies electricity when necessary. In the case where the light emitting guide device is constituted by an independent power supply system including the solar cell 140 and the solar cell 150 without being supplied with electricity by the separate electricity supply source, the measured value of the visibility measurement unit 130 Therefore, by selectively flickering the light source unit 400, it becomes possible to effectively use electricity.

The present invention can optically couple the light source unit 400 and the plurality of optical fibers 200 using the total internal reflection lens 300 to effectively transmit the light emitted from the light source unit 400 to the optical fiber 200 without loss of light , The light emitting device emits light of a larger amount of light in the display area by the improved light transmission efficiency or coupling efficiency, thereby improving the visibility of the guide device such as the traffic safety sign, the advertisement sign, and the sign board. The energy consumption of the light source unit 400 may be reduced by reducing the energy consumed by the light source unit 400 as the light transmission efficiency is improved. In addition, since the exit surface 330 of the total internal reflection lens 300 and one end face of the plurality of optical fibers 200 are bonded to each other with a transparent resin adhesive layer, the Fresnel loss can be effectively reduced, thereby further enhancing the light transmission efficiency or coupling efficiency.

The visibility is measured according to the change of the external environment and the light source unit 400 is controlled so as to emit white light having different color temperatures by using the visibility of the light source unit 400. The nighttime, bad weather, fog, snow, rain, Even in this case, visibility can be ensured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Those skilled in the art will appreciate that various modifications and equivalent embodiments may be possible. Accordingly, the technical scope of the present invention should be defined by the following claims.

100: light emitting guide device 110: housing part
120: Display area 130: Visibility measurement part
140: solar cell 150: solar cell capacitor
200, 201a, 201b: optical fiber 300: total internal reflection lens
310: incidence plane 311: first incidence plane
312: second incident surface 320: reflecting surface
330: exit surface 340: concave
400: light source part 410: first light emitting diode
420: second light emitting diode 500: resin adhesive layer

Claims

A housing part including a display area for displaying guide information;
A light source unit provided in the housing unit and including a light emitting diode emitting white light;
A reflecting surface for reflecting the light incident on the incidence surface, and an exit surface for intersecting the optical axis and for reflecting the light reflected from the reflecting surface to the outside, An internal total reflection lens for guiding the path of light to be made;
And the other end face is provided in a part of the display area and is provided with a plurality of light incident on the exit face at an incident angle smaller than the critical angle of the total internal reflection lens and transmitting the light escaping to the display area Of optical fiber;
A visibility measuring unit for measuring visibility according to changes in the external environment; And
And a control unit for controlling the light source unit so that the color temperature of the white light is changed according to the visibility measurement value sensed by the visibility measurement unit.

The method according to claim 1,
Wherein the total internal reflection lens includes a concave portion for accommodating the light source portion,
Wherein the concave portion includes a first incident surface facing the light source portion and including a convex surface protruding toward the light source portion; And
And a second incident surface provided around the light source unit.

The method of claim 2,
And the convex surface protruding toward the light source portion of the first incident surface is an aspherical shape.

The method according to claim 1,
Wherein the reflection surface of the total internal reflection lens is formed on a side surface of the total internal reflection lens and forms at least a part of a parabolic shape.

The method according to claim 1,
Wherein the exit surface of the total internal reflection lens is formed in a plane shape in front of the total internal reflection lens.

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The method according to claim 1,
The light-
A first light emitting diode emitting white light of a first color temperature; And
And a second light emitting diode that emits white light of a second color temperature lower than the first color temperature.

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The method according to claim 1,
Wherein the visibility measuring unit includes at least one of an illuminance sensor for sensing illuminance, a rain sensor for sensing moisture, and a camera for acquiring an image of an external environment.

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The method according to claim 1,
Further comprising a transparent resin adhesive layer provided between an exit surface of the total internal reflection lens and one end surface of the optical fiber.

The method of claim 11,
Wherein the transparent resin adhesive layer has a refractive index of 1.3 to 1.65.

The method of claim 11,
And one end face of the optical fiber is inserted into the transparent resin adhesive layer.