JP2006190622A - Lighting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting tool which is compact and easy to manufacture, and can emit an illumination light on the whole surface of emission face uniformly and in high luminance. <P>SOLUTION: The lighting tool has a long body 2 of a circular cross-section formed of translucent resin and an LED 5 arranged on both ends of this long body 2. A prism 3 is formed along its axial direction on the rear face of this long body 2, and this prism 3 has a large number of projections 4 in parallel with a cross-section of triangle and the projections 4 extend in a perpendicular direction to the axis. The depth of the valley 4a between the projections 4 is formed deeper the nearer it is to the center in the axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lighting fixture.

  As a conventional lighting advertisement, there is an electric display board composed of a display film or sheet on which symbols, characters, etc. are arranged, a surface light source installed on the back side thereof, and a frame or the like that fixes and superimposes these. As the display sheet, a display sheet that is colored and displayed by printing or the like on the surface of a sheet having translucency (including transparent and translucent) is generally used. As the surface light source, a discharge lamp such as a fluorescent lamp arranged in parallel in a plate shape is known. As another surface light source, a light guide plate in which a reflection pattern is formed on the back surface of a transparent resin plate such as acrylic is used, and a light source such as a fluorescent lamp is disposed on a side portion of the light guide plate.

  Further, a so-called neon tube is known as a light source that is linearly formed with letters and patterns.

  However, with the light guide plate as described above, it is difficult to achieve uniform and high brightness illumination on the entire display sheet. This is even if a reflection pattern is formed on the back surface of the light guide plate. That is, it is difficult to emit light traveling in the light guide plate substantially parallel to the surface of the light guide plate in a direction perpendicular to the surface. Further, if a fluorescent lamp is used as the light source, the power consumption is large, and the frequency of maintenance increases. This also applies to the neon tube.

  The present invention has been made to solve the above problems, and is compact and easy to manufacture, and emits illumination light uniformly and with high brightness over the entire light emitting surface (surface from which illumination light should be emitted). An object is to provide a lighting device that can be used.

  The illuminating device of the present invention includes a long body having a circular cross section formed of a translucent resin, and light sources disposed at both ends of the long body, and the shaft is provided on the back surface of the long body. A prism portion is formed along the direction, and the prism portion is a large number of parallel ridges having a triangular cross section, the ridges extending in a direction perpendicular to the axis, and a valley between the ridges. The depth of the is closer to the center in the axial direction.

  According to this configuration, the light traveling from the light source and traveling in the axial direction inside the elongated body can be reflected in a substantially right angle direction by the prism, so that the light is effectively condensed from the light emitting surface. Can be emitted. Also, the closer to the center in the axial direction, the higher the prism effect, so that a reduction in luminance due to separation from the light source is prevented, and a high luminance and uniform illumination effect can be obtained.

  The long body includes not only a solid body but also a hollow body in which a cavity along the axial direction is formed, that is, a thick tubular body.

  Another lighting device of the present invention has a plurality of long bodies having a circular cross section made of a translucent resin assembled in a plate shape with the axial directions thereof being parallel to each other, and both ends of the assembled long bodies. A prism portion is formed along the axial direction on the back surface of each elongated body corresponding to one surface of the plate, and the prism portion is a parallel triangle having a triangular cross section. A large number of ridges, the ridges extending in a direction perpendicular to the axis, are formed deeper as the depth of the valley between the ridges is closer to the axial center.

  According to this illuminator, high-luminance and uniform illumination light is emitted over the entire surface.

  In such a lighting device, an engagement convex portion for connecting the lighting devices to each other is formed on the outer side surface of the long body on one side side, and the outer side surface of the long body on the other side side Are formed with recessed portions to be engaged at positions corresponding to the engaging convex portions for connection, and the terminal frames for the light source are disposed at both ends of the assembled long body. A lighting fixture in which the frame has connection portions for connecting the terminal frames to both ends thereof is preferable. This is because the area of the light source can be freely increased or decreased as a surface light source.

  In any of the above lighting fixtures, the light source is preferably composed of a set of a red light emitting diode, a green light emitting diode, and a blue light emitting diode attached to each end of the elongated body. This is because illumination light of various colors can be obtained.

  According to the present invention, the illumination light traveling in the axial direction inside the long body as the light guide is reflected by the prism in a substantially right angle direction, so that the light can be effectively emitted from the light emitting surface. . As a result, it is compact and easy to manufacture, and the illumination light can be emitted uniformly and with high brightness over the entire light emitting surface (the surface from which the illumination light should be emitted).

  Hereinafter, embodiments of the lighting device of the present invention will be described with reference to the drawings.

  FIG. 1A is a partial cross-sectional front view showing an embodiment of a lighting device of the present invention, FIG. 1B is a rear view thereof, and FIG. 1C is I in FIG. FIG. The illuminating device 1 is composed of a long body 2 having a cylindrical shape, and is formed of an acrylic resin having translucency. There is no particular limitation to acrylic, and any suitable transparent resin may be used. Or you may form the elongate body 2 from the quartz type glass used as an optical fiber, or another component type glass. The cross section of the elongated body 2 is substantially circular, but may be oval.

  A prism 3 is formed on the back surface of the long body 2 along the axial direction thereof. The back surface is a part of the surface of the long body, and is an area on the circumference of an arbitrary circular cross section. The prism 3 may be formed over the entire length of the elongated body 2 or may be excluded near both ends.

  The prism 3 has a large number of parallel protrusions 4 having a triangular cross section, and the protrusions 4 extend in a direction perpendicular to the longitudinal direction (axial direction) of the long body 2. The depth of the valley 4a between the ridges 4 is formed so as to be closer to the center in the axial direction. However, since all the top parts (ridge parts) 4b of all the protrusions 4 are in the same position, when all the collar parts are connected, it becomes a flat surface. In the present embodiment, the angle α of the protrusion 4 is about 90 °, but is not particularly limited to 90 °.

  The depth distribution of the valley 4a may be increased linearly from both ends of the elongated body 2 toward the central portion in the axial direction, or may be increased in a quadratic curve. In the present embodiment, the depth of the deepest valley is about 15% of the diameter of the long body 2. For example, in a long body having a diameter of about 8 mm, the deepest groove is about 1.2 mm. However, the ratio and dimensions are not limited.

  A light emitting diode (LED) 5 as an illumination light source is attached to each of both ends of the long body 2. Reference numeral 5a denotes a pin as a connection terminal. The LED 5 may be a full color LED or a single color LED. Mounting holes 6 having substantially the same diameter as that of the LED 5 are formed at both ends of the long body 2, the LED 5 is fitted into the mounting hole 6, and an adhesive is applied to the flange 5 b of the LED 5 to make the long It is fixed to the body. The inner surface of the mounting hole 6 is superfinished so as to maintain transparency. Instead of the full-color LED, a long body 2 having a large cross-sectional diameter may be used to form three attachment holes 6 at the end thereof, and the blue, green, and red LEDs may be mounted together. By controlling the voltage for each color in the three LEDs of full color LED or blue green red by a control device (not shown), a desired color can be displayed and can be changed over time.

  The illuminating device 1 obtains uniform and high-luminance illumination over the entire length of the long body 2 by emitting illumination light from the LED 5 to the outside from the surface of the long body 2. Therefore, the prism 3 works effectively.

  Since the light from the LED 5 has no directivity, a part of it passes through the interface of the long body 2 with the atmosphere and is emitted to the outside, and the other part passes through the inside of the long body 2 along its axial direction. And travels in the axial direction inside the elongated body 2 while being reflected at the interface with the atmosphere, or passes through the interface with the atmosphere while traveling in the axial direction and is emitted to the outside. As a result, if the prism 3 is not formed, the luminance in the vicinity of both ends near the illumination light source 5 in the long body 2 is relatively high, and the luminance decreases as it approaches the center in the axial direction.

  However, since the prism 3 is formed in this embodiment, this tendency is eliminated. That is, the illumination light is mainly emitted from the surface opposite to the back surface (referred to as the upper surface) on which the prism 3 of the long body 2 is formed. This is because, as indicated by an arrow A in FIG. 1A, the illumination light is reflected by the prism surface (inner slope of the ridge) inside the elongated body 2 and faces the upper surface. The larger the area of this prism surface, the greater the amount of light that is reflected and transmitted through the upper surface. Therefore, as described above, the depth of the valley 4a of the prism 3 is increased toward the central portion in the axial direction of the long body 2 (the area of the prism surface is increased), so the effect of the prism 3 is long. It becomes higher as it approaches the axial center of the scale 2. As a result, uniform and high-luminance illumination can be obtained over the entire length of the long body 2. Further, when a cross section perpendicular to the axial direction of the long body 2 is seen, an upward light condensing effect is exhibited by the effect of a so-called convex lens.

  In addition, although the illustrated elongate body 2 is a solid body (a thing without a cavity inside), it is not limited to this. The long body may have a cavity formed along the axial direction thereof, that is, a thick tubular body. This cavity may extend along the central axis of the elongated body 2 and communicate with the LED mounting holes 6 at both ends. By this cavity, attenuation of light from the LEDs at both ends is suppressed, and the luminance of the luminaire is improved.

  The usage of the lighting device 1 is not particularly limited. For example, it can be installed on the back of a bicycle or a self-propelled wheelchair and used as a night warning light. Moreover, you may fit in a wall or a ceiling. Since the long body 2 is molded using a mold, the shape is not limited to a straight line, and can be formed into a curved line or a combination of a curved line and a straight line. Even in this case, when the surface formed by the curved long body 2 is a flat surface, it is easy to form a prism on the same surface side of the long body 2. Therefore, the long body 2 can be formed into a simple character or pattern.

  FIG. 2 shows another illumination tool 11. The illuminator 11 uses a flat plate 12 having a long plate shape. The elongated body plate 12 is formed by integrally forming a plurality of linear elongated bodies 2 in an aligned state. The plurality of linear elongated bodies 2 are all the same length and are arranged in parallel and in a flat plate shape. Part of the side surfaces of the long bodies 2 are continuously integrated. Since all the long bodies 2 have the prism portions 3 (not shown) formed on the same surface side, the prisms 3 are formed only on the back surface of the long body plate 12. In addition, the number of the long bodies 2 and the length of the long body plate 12 can be set arbitrarily.

  And LED5 is mounted | worn with the both ends of each elongate body 2 similarly to the above-mentioned (FIG. 1). Since a plurality of LEDs 5 are arranged in a row at both ends, one outlet frame 23 (see FIG. 4B) for supplying power is fitted to the pins 5a of all the LEDs 5 at each end. sell. If LED5 is made to light-emit, uniform and high-intensity light will be radiate | emitted from the whole upper surface (surface on the opposite side of a back surface) of the elongate body board 12. FIG. The illuminator 11 is useful as a surface light source and is suitable as a backlight for an electric display panel or the like.

  FIG. 3 shows an electric display panel 13 using the illuminator 11 (FIG. 2). In this electric display panel 13, a reflector 14 is disposed on the prism forming side (back side) of the illuminator 11, and a display sheet 15 on which a desired display is performed is disposed on the upper surface side of the illuminator 11. If the three parties 11, 14, and 15 are overlapped and a frame 16 for fixing the three members is fitted on the four sides (only two opposite sides are shown), the electric display panel 13 is completed.

  The display sheet 15 is preferably a translucent material, particularly a translucent material. The reflecting plate 14 may be a mirror-finished metal plate or a metal-plated resin plate. By doing so, the light that has passed through the prism portion 3 and exited outside the back surface is returned into the elongated body plate 12 by the reflecting plate 14 and is effectively emitted from the upper surface.

  FIG. 4 shows another lighting fixture 21. This illuminating device 21 is obtained by connecting a plurality of flat illuminating devices 11 shown in FIG. 2 in a flat plate shape. Although the single flat illuminating device 11 has a flat plate shape as described above, the sides of the illuminating device 11 are connected to each other by a so-called one-touch connection portion 22 of the two illuminating devices 11. The connecting portion 22 is formed at a position corresponding to the engaging convex portion 22a projecting on the left and right side sides of the one lighting device 11 and the engaging convex portion 22a on the other side. It is comprised from the engagement recessed part 22b. When the engaging projections 22a of the other lighting fixtures 11 are closely fitted in the engaging recesses 22b of the one lighting fixture 11, both the lighting fixtures 11 are detachably connected.

  As described above, the power supply outlet frame 23 is fitted to the pins 5a of all the LEDs 5 at both ends of each illuminator 11. The outlet frame 23 is formed with holes 26a and 26b into which the positive and negative pins of the LED 5 are inserted. The plurality of positive hole 26a are connected by a conductive wire 24a, and the plurality of negative holes 26b are connected by a conductive wire 24b.

  As shown in the figure, the outlet frame 23 is also formed with a connecting portion for connecting the outlet frames 23 to each other. This connection portion is composed of a connection terminal pin 25 protruding from one end of the outlet frame 23 and a connection hole 27 formed at the other end into which the pin 25 is inserted and fitted. The pin 25 and the connection hole 27 are both a positive-side pin 25a and a connection hole 27a connected to the positive-side conductive line 24a, and a negative-side pin 25b and a connection hole 27b connected to the negative-side conductive line 24b. It consists of.

  According to such a configuration, the outlet frames 23 are attached to the front and rear ends of each lighting fixture 11, and the lighting fixtures 21 having a large area are obtained by connecting the lighting fixtures 11 and the outlet frames 23 using these connecting portions. can get. Since the small illuminator 11 is manufactured, the manufacture is easy, and an arbitrary large area illuminator 21 can be obtained by connecting them.

  The illuminating device of the present invention is suitable as a surface light source for an electric display panel such as a lighting advertisement or as a simple luminescent sign.

Fig.1 (a) is a partial cross section front view which shows the lighting fixture concerning one Embodiment of this invention, FIG.1 (b) is a rear view of Fig.1 (a), FIG.1 (c) is a figure. It is the II sectional view taken on the line of 1 (a). It is a perspective view which shows the lighting fixture concerning other embodiment of this invention. It is a partially cutaway perspective view which shows the state before the assembly of the panel with which the lighting fixture of FIG. 2 is mounted | worn. Fig.4 (a) is a top view which shows the assembly procedure of the lighting fixture of FIG. 3, FIG.4 (b) is the IV-IV arrow directional view of Fig.1 (a).

Explanation of symbols

1, 11, 21 ... lighting fixture
2 ... Long body
3 ... Prism
4 ... Projections
5 ... LED
6 ... Mounting hole
12 ... Long body plate
13. Lightning display board
14 ... Reflector
15 ... Display sheet
16 ... Frame
21 ... Connection part
22 ... Connection part
23 ... Outlet frame 24a, 24b ... Conductive wire
25 ... Pin for connection terminal
26 ... Connection hole
27 ... Connection hole

Claims (4)

An elongated body having a circular cross-section formed from a translucent resin;
A light source disposed at both ends of the elongated body,
A prism portion is formed on the back surface of the elongated body along the axial direction, and the prism portion is a plurality of parallel protrusions having a triangular cross section, and the protrusions extend in a direction perpendicular to the axis. A lighting fixture formed such that the depth of the valley between the protrusions is closer to the center in the axial direction. A plurality of elongated bodies having a circular cross section made of a translucent resin, which are assembled in a plate shape with their axial directions parallel to each other,
A light source disposed at both ends of the assembled long body,
A prism portion is formed along the axial direction on the back surface of each elongated body corresponding to one surface of the plate, and the prism portion is a plurality of parallel ridges having a triangular cross section. Is extending in a direction perpendicular to the axis, and is formed such that the depth of the valley between the ridges is deeper as it is closer to the center in the axial direction. Engagement projections for connecting the lighting fixtures are formed on the outer side surface of the long body on the one side side, and on the outer side surface of the long body on the other side side, An engaged recess is formed at a position corresponding to the engaging protrusion,
The terminal frame for the said light source is arrange | positioned at the both ends of the gathered elongate body, This terminal frame has a connection part for connecting terminal frames to the both ends. Lighting equipment.   The illuminating device according to claim 1 or 2, wherein the light source comprises a set of a red light emitting diode, a green light emitting diode, and a blue light emitting diode attached to each end of the elongated body.

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