JP2007109504A - Bar light source for lighting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to use for interior and show case or the like in replacement of a hot cathode fluorescent lamp light source. <P>SOLUTION: An end cap 5 is arranged at the end part of a bar light source of center thick shaft made of acrylic transparent resin and a heat radiation member 6 made of aluminum extrusion material is installed on the end cap 5, and a large number of power LED chips 7 are arranged at the substrate 61 of the heat radiation member 6 so as to face the incident end face of the bar light source 1; on the other hand, a reflecting plate is arranged at the light guide face 11 and the side face of the bar light source 1 and a light diffusion plate 3 is arranged at the light outgoing face, while a cover 4 for preventing warping and stains of the bar light source 1 is arranged at locations other than the light outgoing face to form the bar light source. The bar light source is obtained which has high luminance and durability and suitable for various kinds of lighting. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting bar light source that can be used as a substitute for a hot cathode fluorescent lamp light source at an appropriate place such as a store or a house interior or a refrigerated showcase of a store.

  As this type of illumination light source, the above-described hot cathode fluorescent lamp is generally used. For example, as a liquid crystal backlight, for example, dots of density change are arranged on the back surface of a wedge-shaped acrylic transparent resin by integral molding or screen printing. In this case, the back surface is used as a light guide surface, and a cold cathode fluorescent lamp or LED lamp is provided on the end surface of a wedge-shaped wide width so that incident light is guided by the light guide surface.

JP-A-8-184714

  Hot cathode fluorescent lamps can secure the necessary and sufficient brightness for lighting in stores and houses, but there are problems such as large heat generation, long life, and emission of ultraviolet rays. The large size is not suitable for food in a refrigerated showcase, for example, and the emission of ultraviolet rays is equally unsuitable for inviting, for example, in-store merchandise.

  In addition, LCD backlights can be used to illuminate the screens of personal computers, mobile phones, etc. from the back to ensure the level of brightness necessary for the surface lighting equipment. However, the lack of brightness becomes remarkable and cannot be used practically.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and the problem to be solved is illumination that has a luminance equal to or higher than that of a conventional hot cathode fluorescent lamp and can be used as an alternative to the hot cathode fluorescent lamp. To provide a bar light source.

  In accordance with the above problems, the present invention uses a resin having excellent light transmittance such as acrylic, and has a light guide surface on the resin to provide a thick light guide bar with a thick shaft. The number of reflections of incident light supplied to the light guide bar within the light guide bar can be increased as much as possible, making it suitable for improving luminance and making the incident end surface as wide as possible, Incident light with as high brightness as possible is supplied to the incident end face of the area by a large number of power LEDs, and since heat generation is higher than that of general LEDs by using power LEDs, the heat generation is reduced. By radiating heat with a heat dissipating member fitted and arranged in an end cap arranged at the end, it is possible to prevent damage to the LED and a decrease in durability due to this, and to provide a practical bar light source that ensures practicality. Ie claims A transparent resin light guide bar provided with a light guide surface so as to be continuous in the longitudinal direction with a solid thick axis, and end caps disposed at both longitudinal ends of the light guide bar; A heat dissipating member at one or both ends in the longitudinal direction of the light guide bar fitted and disposed in the end cap, and a number of power LEDs for supplying incident light toward the incident end surface of the light guide bar disposed on the heat dissipating member. By providing it, it is used as an alternative to the hot cathode fluorescent lamp light source.

  In addition to the above, the invention according to claim 2 is configured such that the power LED is a chip, so that as many chips as possible are arranged on the incident end face to reduce the amount of incident light as much as possible. The lighting bar according to claim 1, wherein the power LED is constituted by a chip in which a large number of the power LEDs are evenly arranged on a facing surface facing the incident end surface of the heat radiating member. It is a light source.

  In addition to the above, the invention described in claim 3 is such that the light guide bar having the solid thick shaft has a preferred cross-sectional shape as a bar light source by increasing the number of reflections in the light guide bar. Furthermore, this is characterized in that the light guide bar has a rectangular cross section with a side of 1.5 cm or more or a circular cross section with a diameter of 1.5 cm or more, and the length is about 1 to 3 m. The illumination bar light source according to claim 1 or 2.

  In addition to the above, the invention described in claim 4 can secure the heat radiation efficiency of the heat radiating member as high as possible and can hold the chip LED toward the incident end face of the light guide bar stably and reliably. As described above, the heat radiating member is formed of an aluminum extruded member integrally formed with a vertical substrate and a heat radiating fin projecting in the direction of crossing the substrate on the back surface of the vertical substrate, and the surface of the substrate is 4. The illumination bar light source according to claim 1, wherein the chip LEDs are integrally disposed.

  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 uses a resin excellent in light transmittance, and has a light guide surface on the resin. By making it solid, it is possible to increase the number of reflections of incident light supplied to the light guide bar in the light guide bar as much as possible, making it suitable for improving luminance and making the incident end surface as wide as possible On the other hand, incident light with as high brightness as possible is supplied to the incident end face of the large area by a large number of power LEDs, and by using the power LED, heat generation higher than that of a general LED can be seen. Therefore, by dissipating the heat generated by the heat dissipating member fitted in the end cap disposed at the end, damage to the LED and a decrease in durability due to this are prevented, thereby ensuring practicality. More than equivalent to cathode fluorescent lamp Has a luminance, it is possible to provide an illumination bar light source to allow alternate use heat cathode fluorescent lamp.

  In addition to the above, the invention according to claim 2 is configured such that the power LED is a chip, so that as many chips as possible are arranged on the incident end face to reduce the amount of incident light as much as possible. It can be increased.

  In the invention described in claim 3, in addition to the above, the light guide bar having the solid thick shaft has a preferable cross-sectional shape as a bar light source by increasing the number of reflections in the light guide bar. Can do.

  In addition to the above, the invention according to the fourth aspect of the present invention has a preferable end form that is compact and has a good appearance by suppressing the expansion of the end cap as much as possible by arranging an inverter in the heat dissipating member. can do.

  Hereinafter, the present invention will be described in more detail with reference to the example of the drawings. A is a bar light source for illumination. The bar light source A includes a light guide bar 1, an end cap 5, a heat radiating member 6, and a power LED 7. Are used as a substitute for the hot cathode fluorescent lamp light source.

  The light guide bar 1 is made of a transparent resin having a light guide surface 11 so as to be continuous in the longitudinal direction with a solid thick axis, and the end caps 5 are arranged at both ends of the light guide bar 1 in the longitudinal direction. The heat dissipating member 6 is disposed at one end or both ends in the longitudinal direction of the light guide bar 1 fitted and disposed in the end cap 5, and the power LED 7 is incident on the light guide bar 1 disposed on the heat dissipating member 6. There are a number of devices that supply incident light toward the end face.

  The light guide bar 1 is, for example, a solid thick shaft that secures light transmission as high as possible using, for example, an acrylic transparent resin. The light guide bar 1 has a rectangular cross section with a side of 1.5 cm or more or a circular cross section with a diameter of 1.5 cm or more and a length of about 1 to 3 m. A 15 mm acrylic transparent resin plate is cut into a width of about 1.5 to 3 cm, for example, to form a bar with a rectangular cross section of about 1.5 × 1.5 to 3 cm, or 1 by extrusion. The bar is made of an extruded material having a rectangular cross section of about 5 × 1.5 to 3 cm or a circular cross section having a diameter of 1.5 cm or more. The illustrated light guide bar 1 has a rectangular cross-section with a side of 1.5 cm and 2 cm and a length of about 2 m, for example.

  The light guide surface 11 of the light guide bar 1 is arranged so as to form a strip shape in the longitudinal direction of the light guide bar 1 and guides incident light. On the upper surface of the rectangular cross section, for example, the scratching surface arranged in the crossing direction of the light guide bar 1 is formed by changing the density so that the incident end surface side is rough and becomes denser as the distance from the incident end surface increases. The scratches are formed, for example, in the form of a sword or comb, using a light guide part forming tool having a predetermined short width, and moving the light guide part forming tool in the crossing direction of the light guide bar 1 to move the top surface of the light guide bar 1. In this case, the density change of the above-mentioned density is controlled by controlling the contact movement of the light guide forming tool so that the arrangement pitch of the scratches decreases as the distance from the incident end face increases. It is supposed to be applied.

  The remaining surface of the light guide bar 1 with the light guide surface 11 formed and disposed in this way, in this example, the side surface and the bottom surface are mirror-finished, and incident light is incident from the side surface and the bottom surface when the incident light is guided. Is prevented from leaking out of the light guide bar 1, and the light guide efficiency can be maintained as high as possible.

  The end cap 5 is formed of a non-transparent resin such as polyvinyl chloride or aluminum, for example, as a molded member having an opening for receiving the light guide bar 1 at one end, and the molded member has a cross section of the light guide bar 1 by, for example, injection molding. A long extruded material that is individually injection-molded according to the shape or extruded according to the cross-sectional shape of the light guide bar is cut into a predetermined length.

  At this time, the end cap 5 is closed at the other end as necessary, and a heat radiating hole 51 is provided at an appropriate place such as a side surface. In this example, the end cap 5 is connected to the other end. Is closed by a lid member 53 fixed with screws, and a support tool 54 for supporting a bar light source A such as an L-shape is disposed at the other end of the closure. A large number of slit-like heat radiation holes 51 are provided on both side surfaces.

  In this example, the heat dissipating member 6 is formed of an aluminum extruded material that is integrally formed with a vertical substrate 61 and heat dissipating fins 63 protruding from the back of the vertical substrate 61 in the crossing direction of the substrate. The heat dissipating member 6 of the present example has a shape that has the same outer shape as the cross-sectional shape of the light guide bar 1 by molding an aluminum extruded material and cutting it into a predetermined length. At this time, the heat dissipating member 6 of this example is provided with a board space 64 for installing a circuit board (not shown) for LED lighting, for example, and the board space 64 crosses the heat dissipating fins 63. This is due to the through holes formed by notching. Further, in this example, a horizontal groove 62 for installing a power LED 7 to be described later is disposed on the surface of the vertical substrate 61 of the heat radiating member 6 by post-processing after molding.

  The power LED 7 is composed of LED chips in which a large number of LED chips are uniformly arranged on the opposing surface facing the incident end face of the heat radiating member 6. At this time, the LED 7 is integrally arranged on the surface of the substrate 61 of the heat radiating member 6. It is as. That is, the chip LED 7 is a surface-mount type and uses a large number of white LEDs having as high a brightness as possible, for example, white 4 W. The chip LED 7 is embedded in the insulating base 71 and is placed on the back surface of the insulating base 71, for example, with copper. In the state in which the heat radiating plate 72 is disposed, the integral arrangement is performed by adhering to the horizontal groove 62 of the substrate 61 in the heat radiating member 6 through, for example, a thin double-sided adhesive tape.

  In the figure, 2 is a reflector arranged so as to cover the light guide surface 11 of the light guide bar 1, and 3 is a lower surface facing the light guide surface 11 of the light guide bar 1 and arranged on the illumination surface that emits illumination light. The light diffusing plate 4 is arranged outside the reflecting plate 2 and the light guide bar 1 is warped by fitting the light guide bar 1 so as to cover the three surfaces except the illumination surface of the light guide bar 1. A cover formed by extrusion molding of aluminum or resin with a U-shaped cross section for preventing and preventing dirt is shown.

  The bar light source A configured as described above shines uniformly and with high brightness in the longitudinal direction by supplying incident light from a large number of power LEDs 7 to the incident end face of the light guide bar 1 and is used for illumination. Can do. At this time, by setting the light guide bar 1 as a solid thick axis, the number of incident light reflections in the light guide bar 1 can be increased as much as possible to ensure high brightness and to ensure a long life by using the power LED 7. On the other hand, the heat radiation of the power LED 7 can be radiated by the heat radiating member 6, and the LED can be prevented from being damaged by the heat generation to ensure its durability. It can be widely used for lighting applications replacing the hot cathode fluorescent lamp light source at an appropriate place.

  Although the illustrated example is as described above, each specific shape, structure, such as a light guide bar, an end cap, a heat radiating member, a power LED, and a power LED chip to be used as necessary in carrying out the present invention, The materials, their relationship, addition to these, etc. can be in various forms as long as they do not contradict the gist of the invention.

It is a side view of the bar light source for illumination. It is a disassembled perspective view of the longitudinal direction one side part of the bar light source for illumination.

Explanation of symbols

A Bar light source 1 Light guide bar 11 Light guide surface 2 Reflector 3 Light diffusing plate 4 Cover 5 End cap 51 Heat release hole 52 Substrate space 53 Lid member 54 Support 6 Heat dissipation member 61 Substrate 62 Horizontal groove 63 Heat dissipation fin 64 Substrate space 7 LED chip 71 Insulation base 72 Heat sink

Claims (4)

  A transparent resin light guide bar provided with a light guide surface so as to be continuous in the longitudinal direction with a solid thick axis, end caps disposed at both ends in the longitudinal direction of the light guide bar, and within the end cap A hot-cathode fluorescent lamp comprising a heat-dissipating member at one or both ends in the longitudinal direction of the light guide bar that is fitted and disposed, and a plurality of power LEDs that supply incident light toward the incident end surface of the light guide bar disposed on the heat-dissipating member A bar light source for illumination, which is used as an alternative to a lamp light source.   The illumination bar light source according to claim 1, wherein a large number of said power LEDs are uniformly arranged on a facing surface facing the incident end face of the heat radiating member.   3. The light guide bar has a rectangular cross section with a side of 1.5 cm or more or a circular cross section with a diameter of 1.5 cm or more, and a length of about 1 to 3 m. The bar light source for illumination as described in 1. The heat dissipating member is formed of an aluminum extruded material integrally formed with a vertical substrate and a heat dissipating fin protruding from the back surface of the vertical substrate in the crossing direction of the substrate, and the chip LED is integrally disposed on the surface of the substrate. The bar light source for illumination according to claim 1, 2, or 3.

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