JP2009110804A - Panel light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel light source A substitutionally usable for a white fluorescent lamp by securing high illuminance by using a light conductive plate 3. <P>SOLUTION: Two-sheet constitution prism sheets 4a and 4b are laminated and arranged on a light emitting surface of the light conductive plate 3, and these prism sheets 4a and 4b are arranged to be superposed by crisscrossingly orthogonally crossing its prisms. A reflection sheet 2 is arranged on a bottom surface of a case 1, and the panel light source A is formed by storing the light conductive plate 3, the two-sheet constitution prism sheets 4a and 4b and a protective panel 5 of applying dustpoof processing. Illuminance of a just under position of 1 m becomes 250 lux of about 1.6 times of the white fluorescent lamp by superposition of the prism sheets 4a and 4b, and the outer periphery of the illuminating light is partitioned to be surrounded, and the illuminating light is supplied so as to form a similar figure of the light conductive plate 3. For example, when installed on a wall surface of a canopy of a superhighway, a road surface can be effectively illuminated without imparting the glare to a driver. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a panel light source used to illuminate, for example, by being installed on a ceiling or wall of a structure.

  As a light source for this kind of illumination, a fluorescent lamp of a line light source is generally used, and a halogen lamp of a point light source is used in addition to the fluorescent lamp, for example, on a highway.

  On the other hand, a light guide plate is generally used for a liquid crystal backlight. In the liquid crystal backlight, the illumination light is made uniform as much as possible over the entire surface of the liquid crystal screen. In order to diffuse the outgoing light from the surface in advance and prevent the light guide pattern of the light guide plate from seeping through, a diffusion sheet is disposed as a light diffusing surface material, while the outgoing light previously diffused by the diffusion sheet is For example, in order to increase the luminance by condensing toward the front side, a prism sheet is laminated as a prism face material in order to enlarge the viewing angle in the horizontal direction, whereby the liquid crystal at the viewing position of the TV receiver is obtained. It is assumed that the luminance uniformity and viewing angle on the screen are ensured.

JP 2007-108507 A

  Fluorescent lamps and halogen lamps need to be replaced regularly according to their lamp life, and are not always convenient to use, and long-life lighting alternatives are required. For example, a cold-cathode fluorescent lamp or a high-brightness LED can be used to secure a considerable level of brightness and greatly extend the life of the light source. If the means can be put into practical use, it can be widely used in various applications such as houses, public facilities, furniture, and tunnels as an alternative to conventional line light sources and point light sources.

  However, liquid crystal backlights are designed to be used for purposes other than backlighting because they emphasize the uniform display backlighting of the liquid crystal screen as much as possible and the expansion of the viewing angle, for example, in the horizontal direction. Is not appropriate, and based on its configuration, to make it a light source that supplies illumination light to a position away from the light source, the illuminance at the illumination position is low, and the loss of illumination light is likely to occur due to the expansion of the viewing angle Therefore, it is difficult to put this to practical use.

  The present invention has been made in view of such circumstances, and the problem to be solved is to use a light guide plate to provide an illuminance suitable as a light source for supplying illumination light to a position away from the light source as in the above various applications. It is in providing the panel light source suitable for practical use by ensuring.

  In accordance with the above-described problems, the present invention provides a light guide plate in which two condensing prism face materials for condensing are laminated and light emitted from the light exit surface of the light guide plate is refracted by light of these prism face materials. If the secondary and secondary condensing are performed sequentially and the primary condensing and the secondary condensing are made to intersect the light refraction directions orthogonally, the luminance is improved by the double effect of condensing and the light is refracted. For example, a white fluorescent lamp of 20 w / h (diameter: 35 mm, long) at a position immediately below 1 m from the light source by supplying illumination light that is similar to the shape of the light source by surrounding the outer periphery due to the intersection of directions and preventing light loss due to this. The panel light source (300 mm × 300 mm) using a 12 w / h LED has a high illuminance of about 1.6 times that of a fluorescent lamp, such as 250 lux. It becomes By appropriately setting the vertical and horizontal dimensions, it can be used at least in applications that replace fluorescent lamps of linear light sources, including applications that are used in place of a series of fluorescent lamps used in, for example, offices, stores, corridors, and highways. The invention according to claim 1 was made based on the knowledge that it could be suitable for practical use. In other words, the invention according to claim 1 was laminated on the light guide plate and its light exit surface to emit light from the light exit surface. A panel light source including a prism face material that condenses incident light by refraction of light, wherein the prism face material has a two-piece configuration for primary condensing and secondary condensing of the emitted light. The panel light source is characterized in that the light refraction direction of the prism face material having a single sheet structure intersects in a vertical and horizontal orthogonal manner between the primary condensing and the secondary condensing.

  In addition to the above, the invention described in claim 2 does not need to equalize the luminance of the light diffusing surface material as a panel light source, such as a liquid crystal backlight, and when the light diffusing surface material is used, As a result, it is not possible to obtain illuminance. Therefore, it is preferable that the light guide plate and the prism face material having two sheets are directly stacked and arranged in a direct attachment form. 2. A panel according to claim 1, wherein the first condensing prism face material and the two prism face materials are directly attached to the light exit surface of the light plate, and the layers are arranged directly. It is a light source.

  In addition to the above, the invention according to claim 3 may be used as a panel light source. However, there is a possibility that dirt may adhere to the surface even if there is a difference in the use location. 3. The transparent protective sheet or protective panel according to claim 1, further comprising a transparent protective sheet or a protective panel laminated on the surface of the prism face material having the two-sheet structure so as to effectively protect against dust. A panel light source is used.

  In addition to the above, the invention according to claim 4 is a prism-molded sheet in which the prism face material is used in a preferred form in order to suppress the thickness of the panel light source. The panel light source according to claim 1, 2 or 3, wherein the panel light source is a prism molded panel.

  The present invention uses each of these as the gist of the invention as means for solving the above problems.

  Since the present invention is configured as described above, the invention according to claim 1 is arranged such that two condensing prism face materials for condensing are laminated on the light guide plate, and the light emitted from the light exit surface of the light guide plate. When the primary condensing and the secondary condensing by the light refraction of these prism face materials are sequentially performed, and the primary condensing and the secondary condensing are made to intersect the light refraction directions orthogonally, 20w at a position 1 m below the light source, for example, by supplying luminance light that is similar to the shape of the light source by surrounding the outer periphery due to the crossing of the light refraction direction and preventing the loss of light. / H white fluorescent lamp (diameter 35 mm, length 600 mm) is 160 lux, whereas light source plate panel light source (300 mm × 300 mm) using 12 w / h LED is 250 lux. 1.6 times as much Therefore, by setting the vertical and horizontal dimensions appropriately, it is necessary to use at least a line, including applications that are used as substitutes for a series of fluorescent lamps used for roads in offices, shops, corridors, and highways. It is possible to provide a panel light source suitable for practical use in a fluorescent lamp replacement application of a light source.

  In addition to the above, the invention described in claim 2 can be a preferable form for securing illuminance by directly arranging and arranging the light guide plate and the prism face material of two sheets in a direct attachment form. .

  In addition to the above, the invention according to claim 3 can effectively protect the prism face material of the panel light source from dust.

  In the invention according to claim 4, in addition to the above, the prism face material can be in a preferred form in order to suppress the thickness of the panel light source.

  Hereinafter, the present invention will be described in more detail with reference to the example of the drawings. A is a panel light source, and the panel light source A is laminated on the light guide plate 3 and its light exit surface to emit light emitted from the light exit surface. And prism surface materials 4a and 4b that condense light by refraction, and the prism surface materials 4a and 4b have a two-sheet configuration for primary condensing and secondary condensing of the emitted light, and It is assumed that the light refraction direction of the prism surface materials 4a and 4b having the two-sheet structure intersects in a vertical and horizontal orthogonal manner between the primary condensing and the secondary condensing. In the light source A, a transparent protective sheet or a protective panel, in this example, a protective panel 5 is further laminated on the surface of the prism face materials 4a and 4b having the two-sheet structure.

  That is, in this example, the panel light source A includes a case 1, a light guide plate 3 housed in the case 1, a reflective surface material 2 interposed between the bottom surface of the case 1 and the back surface of the light guide plate, and the light guide plate 3. The prism surface materials 4a and 4b having the above-described two-layer structure arranged on the light exit surface, the protection panel 5 on the surface thereof, and the high-brightness projecting on a pair of opposed incident end faces of the light guide plate 3 as a primary light source of the panel light source The LED 6 is provided.

  The case 1 is formed by bending a plate material into, for example, a box shape with an opening on one side, an aluminum case main body 11 having an internal dimension for housing the light guide plate 3 and the high-intensity LED 6, and bending of the plate material or Similarly, an aluminum L-shaped member 12 that covers the opening side end portion of the case main body 11 by extrusion molding is provided. The case main body 11 and the L-shaped member 12 are made of aluminum, so that high luminance is achieved. The heat generated by the LED 6 is dissipated to prevent deterioration of the LED due to the heat storage.

  The length of the light guide plate 3 is 300 mm × 300 mm, 300 mm × 600 mm, 300 mm × 900 mm, for example, with a reference width of 300 mm, in which a light guide pattern is arranged on the back surface of the transparent acrylic resin panel by screen printing or integral molding. Is a plane square or rectangle with the reference width or multiple of the width as a reference width, and a pair of opposed end surfaces, for example, a pair of upper and lower end surfaces is an incident end surface, and a pair of other opposed end surfaces intersecting each other , For example, a pair of left and right end faces are mirror-finished reflecting surfaces.

  The reflective surface material 2 uses a highly reflective metal or synthetic resin surface material, and guides the incident light supplied from the incident end surface into the light guide plate to the light output surface side to be output light. The light guide plate 3 is interposed between the back surface of the light guide plate 3 and the case main body 11 so as to be in contact with the back surface of the light plate 3, for example. The material 2 is made of a reflective sheet, and the reflective sheet is made of, for example, a foamed polyester resin that ensures a high degree of whiteness and reflectance.

  In this example, the prism face materials are arranged so that the primary condensing prism face material 4a and the secondary condensing prism face material 4b are directly attached to the light exit surface of the light guide plate 3, respectively. Therefore, other surface materials such as a diffusion sheet as a diffusion surface material are provided between the light exit surface of the light guide plate 3 and the prism surface material 4a and between the prism surface materials 4a and 4b having two sheets. The layers are arranged so that they are in direct contact with each other without intervention.

  The prism face materials 4a and 4b are used as prism molded sheets or prism molded panels. In this example, the prism face materials 4a and 4b are prism-shaped sheets, that is, small prisms on the surface of the acrylic resin layer. Are used, or a multi-layer structure in which an acrylic resin layer having a micro prism on the surface is laminated on a film base such as a polyester resin layer. At this time, a prism angle of 90 degrees is often used for a liquid crystal backlight, but a condensing as illumination light is 90 degrees or more, for example, 150 degrees, preferably 130 degrees, depending on the application. It is appropriate to select and use as appropriate. That is, although it depends on the application, in general, if it is less than 90 degrees, the illuminance can be obtained, but the tendency of the illumination light to become a spot becomes stronger, and it is not suitable as the panel light source A that should secure the illumination range extending to some extent, If the angle exceeds 150 degrees, the illumination light tends to spread conversely, and it becomes difficult to secure the illuminance within the illumination range, which is not appropriate. If the angle exceeds 130 degrees, this tendency occurs. If the prism angle is secured, the prism pitch, the prism height, the prism arrangement form, etc. can be appropriately set. Therefore, for example, the prism is arranged in the middle through a horizontal portion of a horizontal flat plate. In addition, since it is not necessary to limit the prism surface material of the panel light source to a thin one, it is also possible to use a resin molded panel made of a prism, such as an acrylic resin.

  The prism face materials 4a and 4b are of a two-sheet configuration in which two pieces are directly arranged so as to be mounted directly on the light output surface of the light guide plate, but at this time, the prism face materials 4a and 4b are The prism surface can be on the light guide plate side, or on the non-light guide plate side, that is, on the front side, and those having different prism angles can be used, and a prism molded sheet and a prism molded panel can also be used in combination.

  In this example, the prism forming sheet has a prism angle of 90 degrees, a prism pitch of 100 μm, and a prism height of 50 μm. Two pieces are superposed and laminated on the light exit surface of the light guide plate.

  The vertical and horizontal crossing of the light refraction direction in the prism face materials 4a and 4b having two sheets is formed by superimposing one prism on the other so that the other prism is orthogonal to each other, thereby forming a fine mesh by both prisms. The stacked arrangement is made so that the outgoing light is transmitted and the outgoing light is refracted, and the intersection is confirmed by checking the direction of the prism row of the prism molding surface of the prism face material, This can be done by superposing the other in the vertical direction and the other in the horizontal direction. As a result, the prism face material 4a primarily collects the light emitted from the light exit surface of the light guide plate 3 to prevent the illumination light from diffusing in the vertical or horizontal direction, while the prism surface 4b The emitted light that has been primarily condensed is further condensed secondarily in the cross direction to prevent the illumination light from diffusing in the horizontal direction or the vertical direction, and the primary and secondary collections. The illuminance as the illumination light can be increased as much as possible by the light.

  The protective panel 5 is highly transparent and has a dust-proof treatment on the surface, for example, an acrylic resin panel or a glass panel. The entire surface of the protective panel 5 is applied to the prism surface material 4b on the front side of the two-sheet configuration. Laminated so as to cover.

  In this example, the LED 6 as the primary light source uses, for example, a flexible LED unit in which an LED chip is arranged on a flexible substrate. At this time, the LED unit has a high density arrangement in which the arrangement pitch of the LED chips is 10 mm, for example. For example, the power consumption is 12 w / h in total.

  The reflective surface material 2, the light guide plate 3, the prism surface materials 4a and 4b, the protection panel 5 and the LED 6 are housed in the case 1 to form the panel light source A. That is, as described above, the reflective surface material 2 is fixed to the bottom surface of the case body 11 of the case 1, while the back surface of the flexible substrate is adhered to the standing wall facing the case body 11 facing the incident end surface of the light guide plate 3. The LED main unit is fixed so that the LED 6 is disposed close to the incident end face of the light guide plate 3 by fixing with a tape, an adhesive, or the like, and the reflection surface material 2 and the LED unit are fixed in the case main body. The light guide plate 3, the two prism face materials 4 a and 4 b and the protective panel 5 are sequentially or collectively laminated on the reflective surface material 2 of 11, and the case body 11 covers the opening end thereof. The L-shaped member 12 is fixed by screwing, bonding or the like, and the L-shaped member 12 is fixed to the light guide plate 3, the prism face members 4a and 4b and the protection panel which are housed in the case body. As the end portion pressing suppressed Le 5 side, it is subjected to fixing to these cases 1.

  The panel light source A of this example configured in this manner was compared with a conventional white fluorescent lamp (20 w / h), and the illuminance at a position 1 m away from the light source was measured. The result was as shown in FIG. That is, the illumination intensity of the panel light source A in this example was 250 lux and 135 lux, respectively, at the position directly below and 50 cm away from the position immediately below the light source, whereas the white fluorescent lamps were 160 lux and 120 lux. The panel light source was about 1.6 times the white fluorescent lamp at the position immediately below and 1.1 times at the inclined position.

At this time, the life of the LED 6 used in the panel light source A of this example is 50,000 hours, and the life of the white fluorescent lamp is 10,000 hours. Therefore, when the power consumption of 50,000 hours is calculated by excluding the life, the panel light source A is 600 kW. , White fluorescent lamp is 1,000kw, and if this is 1 kW for 21 yen, panel light source A is 12,600 yen, white fluorescent lamp is 21,000 yen, and 1 kW is 0.358kg The amount of CO ₂ emission is 214.8 kg for the panel light source and 358 kg for the white fluorescent lamp. Therefore, by using the panel light source A of this example instead of the white fluorescent lamp, the lamp life can be extended five times, and the power consumption, the electricity bill, and the CO ₂ emission can be suppressed to 60%.

  For example, as shown in FIG. 4, if the panel light source A of this example is installed on the inner road surface of the expressway at a slight inclination toward the road surface, the illumination light reaches the ceiling or the opposite wall. In addition, it is possible to effectively illuminate a road surface that needs to be illuminated during driving. Further, the panel light source A has a prism surface material 4a, 4b as a pair, and the prism directions thereof are orthogonally arranged so that the light refraction directions intersect vertically and horizontally orthogonally, thereby providing primary and secondary condensing prism surface materials 4a, The outer periphery of the illumination light can always be surrounded regardless of the form of the stacked arrangement of 4b. Therefore, if it is installed on the expressway of the expressway, it is possible to prevent the illumination light from going to the driver side, and it is also effective to give glare to the driver as seen in fluorescent lights that emit illumination light in a non-directional direction. Therefore, it is possible to provide a lighting device that ensures ease of operation.

  The panel light source A can change the width and length of the light guide plate 3 together with the case 1, the reflective surface material 2, the prism surface materials 4a and 4b, and the protective panel 5, so that the above rectangular one or a plurality of them can be used. In addition to a series of serial arrangements, etc., for example, the panel light source A can be used for the above tunnels, and it can be embedded in the ceiling of offices, lobbies, etc. as a lighting device that does not require maintenance. Can be used for a wide range of purposes.

  In addition, the panel light source should have an appropriate shape such as a flat or curved circle, ellipse, etc., and the lighting unit can be made by integrally fixing the reflective surface material, the light guide plate, the prism surface material, and the protective panel. In carrying out the present invention, the panel light source, the light guide plate, the prism surface material, the protective sheet used as necessary, the protective panel, the prism molded sheet, the prism molded panel, the case, the reflective surface material, etc. The shape, structure, material, relationship between these, addition to these, and the like can be in various forms as long as they do not contradict the gist of the invention.

It is a disassembled perspective view which shows the model of a panel light source. It is a longitudinal cross-sectional view which shows the model of a panel light source. It is a contrast diagram which shows the illumination intensity of a panel light source and a fluorescent lamp. It is a front view which shows the example of a use of a panel light source.

Explanation of symbols

A Panel light source 1 Case 11 Case body 12 L-shaped member 2 Reflective surface material 3 Light guide plate 4a Prism surface material 4b Prism surface material 5 Protection panel 6 Primary light source

Claims (4)

  A panel light source comprising: a light guide plate; and a prism face material that is disposed on the light exit surface so as to collect light emitted from the light exit surface by refraction of light. The light is refracted in the vertical and horizontal directions between the primary condensing and the secondary condensing in a two-element configuration for secondary condensing and secondary condensing. A panel light source characterized by intersecting.   2. The light emitting plate according to claim 1, wherein the prism surface material for primary condensing with respect to the light output surface of the light guide plate and the two prism surface materials are directly attached to each other so as to be directly stacked. Panel light source.   The panel light source according to claim 1, wherein a transparent protective sheet or a protective panel is further laminated on the surface of the prism face material having two sheets.   4. The panel light source according to claim 1, wherein the prism face material is a prism molded sheet or a prism molded panel.

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