JP5156614B2 - Light emitting module and lighting apparatus using the same - Google Patents

Description

  The present invention relates to a light emitting module in which a light emitting diode (LED) is covered with a translucent cover and a lighting fixture using the same.

  An example of a conventional light emitting module of this type is shown in FIG. In FIG. 8, the light emitting module 100 covers a printed circuit board 102 on which an LED 101 is mounted with an LED protecting translucent cover 103, and emits light from the LED 101 through the translucent cover 103. A power supply unit 105 to the LED 102 is built in the back case 104. The translucent cover 103 has a refractive index n greater than 1 and is formed of a transparent acrylic resin member or the like.

  In the light emitting module 100, the light emitted forward (upward in the drawing) through the translucent cover 103 passes through the light 120 emitted through the upper surface of the translucent cover 103 and the side of the translucent cover 103. And light 121 emitted therethrough. The light 121 includes light 122 that is incident on the side of the cover after the light from the LED 101 is totally reflected on the back surface of the upper surface of the cover, and light 123 that is directly incident on the side of the cover. Among them, the light 122 totally reflected on the cover upper surface travels downward from the cover upper surface even after passing through the side surface of the cover, and proceeds in the direction opposite to the irradiation direction. There is little contribution to the illuminance, and the light in the irradiation direction is unevenly irradiated in the direction facing the cover upper surface by the light 120, and the spread of the light in the irradiation direction is narrow.

By the way, the lighting fixture which does not provide the cover for protection of LED and irradiates the light from a light emitting module by reflecting with a reflective mirror member is known (for example, refer patent document 1). However, this light emitting module is merely mounted directly on the wiring board and does not include a cover for protecting the LED, so that it is easily affected by the natural environment when used outdoors and has low reliability.
JP 2008-140000 A

  The present invention solves the above-described problem, and in a light emitting module in which light from a light emitting diode is emitted through a translucent cover, the front surface of the translucent cover is emitted from the front to the lateral direction. An object of the present invention is to provide a light emitting module capable of increasing the illuminance of light, avoiding uneven irradiation in the direction facing the translucent cover, and expanding the spread of light in the irradiation direction.

  In order to achieve the above object, the invention of claim 1 includes a light emitting diode mounted on a substrate and a translucent cover that covers the light emitting diode, and emits light of the light emitting diode through the translucent cover. The light-emitting module, wherein the translucent cover is opposed to the light-emitting surface of the light-emitting diode and is spaced from the light-emitting diode, and the substrate is suspended from the periphery of the flat plate portion toward the light-emitting diode. The side plate portion is formed with an outwardly protruding protrusion capable of condensing light emitted from the light emitting diode through the side plate portion.

  Invention of Claim 2 is a lighting fixture provided with the light emission module of Claim 1, and the reflection part which reflects the light from the said light emission module toward the front, Comprising: The said reflection part is the said side plate part at least. And a reflecting surface that reflects light emitted from the protruding portion forward.

  According to the invention of claim 1, when the direction in which the flat plate portion is located is the front, when the light from the light emitting diode passes through the side plate portion, the bulge of the protrusion increases toward the flat plate portion side along the side plate portion. The light that has passed through the traveling part is refracted toward the front or in a lateral direction substantially parallel to the flat plate part. Thereby, the illuminance of the light emitted from the front to the lateral direction is increased, the bias of irradiation in the direction facing the flat plate portion can be reduced, and the spread of light in the irradiation direction can be expanded.

  According to invention of Claim 2, the light radiate | emitted through the protrusion part of the light emitting module compared with the light radiate | emitted from the side-plate part of a light emitting module when there is no protrusion, and the light of the light emitting diode of a reflection part Since the light is reflected forward on the reflection surface farther from the axis, the spread of reflected light increases. Thereby, it is possible to avoid the uneven irradiation in which only the irradiated range facing the light emitting module becomes brighter, and more uniform illumination can be performed in a wider irradiation range.

  Hereinafter, a light emitting module 1 according to a first embodiment of the present invention will be described with reference to the drawings. 1 and 2 show the configuration of the light emitting module 1 of the present embodiment, FIG. 3 shows the state of light emitted from the translucent cover 4 in the light emitting module 1, and FIG. The advancing direction after passing the side-plate part 42 of the property cover 4 is shown.

  As shown in FIGS. 1 and 2, the light emitting module 1 includes an LED 3 mounted on a wiring board 2 (board), a translucent cover 4 that covers the wiring board 2 including the LED 3, and the wiring board 2 on the back side. And a power supply unit 6 that is housed in the back case 5 and supplies power to the LEDs 3. Both the translucent cover 4 and the back case 5 form a rectangular hollow housing having one opening, and are integrated together so as to sandwich the wiring board 2 from the front and back. In addition, the shape of the light emitting module 1 can be configured in various three-dimensional shapes such as a cylindrical shape, an elliptical cylindrical shape, and a polygonal column in addition to the rectangular shape.

  The wiring board 2 is composed of a printed board such as glass epoxy or paper phenol on which a circuit pattern is formed. The wiring board 2 may form a circuit pattern on a ceramic substrate. The circuit pattern of the wiring board 2 is electrically connected to the power supply unit 6 in the back case 5 by the power cable 7.

  The LED 3 is disposed near the approximate center of the wiring board 2 such that the light emitting surface 30 faces the upper surface of the translucent cover 4, and power is supplied through the circuit pattern of the wiring board 2. The LED 3 can be controlled to be turned on by controlling the power supply with an external control signal.

  The translucent cover 4 is made of a translucent member such as an acrylic resin, and is formed by molding or the like. The translucent cover 4 has a flat plate portion 41 that faces the light emitting surface 30 of the LED 3 and is spaced from the LED 3, and a side plate portion 42 that hangs down from the peripheral edge of the flat plate portion 41 to the wiring board 2 toward the LED 3. Moreover, the translucent cover 4 is comprised so that the cross-sectional shape orthogonal to the longitudinal direction may become substantially symmetrical with respect to the optical axis of LED3. The light from the LED 3 is incident on the flat plate portion 41 and the side plate portion 42 from the inner flat surface 45 and the inner side surface 46 thereof, respectively. The side plate portion 42 has a protrusion 43 bulging outward that can collect the light emitted through the side plate portion 42.

  The protrusion 43 is formed at the end of the side plate portion 42 close to the cover surface along the longitudinal direction of the translucent cover 4, and its cross section forms an isosceles trapezoid and has a predetermined height from the side plate portion 42. The upper bottom surface 61, and an upper inclined surface 62 and a lower inclined surface 63 that are inclined from the upper and lower ends of the upper bottom surface 61 toward the vertical direction of the side plate portion 42, respectively.

  The protrusion 43 has a convex lens action due to such an upward inclined surface 62 and an increase in bulge from the side plate portion 42 toward the upper bottom surface 61, and a lower inclined surface 63 increases the bulge from the side plate portion 42 toward the upper bottom surface 61. It will be a thing. Further, the width d2 of the trapezoidal base of the protrusion 43 is longer than the thickness d1 of the flat plate portion 41. Each inclined surface of the protrusion 43 may be formed by chamfering. Further, the protrusion 43 is not limited to a trapezoidal shape, and may be another polygonal shape.

  The back surface case 5 is formed of an opaque resin member or the like. In addition, you may comprise with the metal member which served as heat dissipation. External power is supplied to the power supply unit 6 in the back case 5 via a power cable (not shown) penetrating the back case 5.

  The back case 5 and the translucent cover 4 hold the wiring board 2 sandwiched from above and below by the opening end surfaces of both. At this time, the wiring board 2 is fitted into the peripheral groove provided at the inner peripheral end portion of the opening end surface of the translucent cover 4 so that the back surface thereof is substantially flush with the opening end surface of the translucent cover 4. It has become. The wiring board 2 and the translucent cover 4 are joined so as to seal the wiring board 2 with an adhesive or the like.

  As shown in FIG. 3, the light emitting module 1 of the present embodiment emits light from the LED 3 through the translucent cover 4. At this time, the light emitted from the translucent cover 4 includes a light beam 31 emitted forward through the flat plate portion 41 and a light beam 32 emitted through the side plate portion 42. The light beam 31 is light that passes through the flat plate portion 41 without being totally reflected by the inner plane 45 of the flat plate portion 41 among the light from the LED 3.

  Further, the light beam 32 is incident on the inner side surface 46 of the side plate part 42 either directly or by being totally reflected by the inner plane 45 of the flat plate part 41. At this time, since the width d2 of the base of the trapezoidal shape in the protrusion 43 is longer than the thickness d1 of the flat plate portion 41, at least a part of the light directly or indirectly incident on the side plate portion 42 is the protrusion. Pass through 43. Here, the light incident on the side plate portion 42 has a light beam 32 a emitted from the upper bottom surface 61 of the protrusion 43 and a light beam 32 b emitted from the lower inclined surface 63 depending on the incident angle to the inner side surface 46 of the side plate portion 42. The light beams 32c that do not pass through the protrusions 43 travel respectively. These light rays 31 and 32 exist symmetrically with respect to the optical axis of the LED 3, but only the light ray examples on the right side of the drawing are displayed here.

Here, with reference to FIG. 4, the light rays 31 (31a, 31b, 31c) and the light rays 32 (32a, 32b, 32c) emitted from the translucent cover 4 will be described in detail. In the light ray 31, the light ray 31 a is incident on the inner plane 45 at a right angle and is emitted without being refracted as it is. The light rays 31b and 31c are light incident with an incident angle θ smaller than the critical angle θr in the inner plane 45 (for example, θr is approximately 42 ° when the refractive index of the translucent cover is 1.49). Yes, the light is refracted and emitted based on the difference between the refractive index n _{0 of} air (n ₀ = 1) and the refractive index n of the translucent cover. The light ray 31c is a light ray having an incident angle θ close to the critical angle θr.

  In the light beam 32, when the upward slope is a positive inclination with respect to the direction parallel to the flat plate portion 41, the light beam 32a (dotted line) and the light beam 32b (solid line) have the light from the LED 3 having a positive inclination. The light is directly incident on the side plate portion 42 and emitted from the upper bottom surface 61 and the lower inclined surface 63 of the protrusion 43, respectively. The light beam 32c (thick solid line) and the light beam 32d (fine dotted line) have a negative inclination in which the light from the LED 3 is once totally reflected by the inner plane 45 of the flat plate portion 41 and proceeds downward from the flat plate portion 41. 42, and the light is emitted through the lower inclined surface 63 of the protrusion 43 or without passing through the protrusion 43. Since the inner plane 45 and the inner side surface 46 are substantially orthogonal, the light totally reflected by the inner plane 45 is not totally reflected by the inner side surface 46 and enters the side plate portion 42.

  Here, since the direct light ray 32a passes through the upper bottom surface 61 with no inclination, the incident angle to the side plate portion 42 and the emission angle from the side plate portion 42 are substantially the same. It becomes a substantially parallel light beam. Similarly, since the light ray 32d only passes through the side plate portion 42 having a certain thickness without inclination, the incident light and the outgoing light are substantially parallel light rays.

  On the other hand, the light beam 32 b and the light beam 32 c emitted from the lower inclined surface 63 of the protrusion 43 are refracted so as to approach the lower inclined surface 63 by the convex lens action of the protrusion 43. At this time, the light beam 32b is refracted so as to be closer to the front when the direction in which the flat plate portion 41 is located is forward, as compared with the case where the protrusion 43 does not exist. Further, since the light beam 32c is refracted so as to approach the direction parallel to the flat plate portion 41, the negative inclination with respect to the flat plate portion 41 becomes smaller, and when the direction parallel to the flat plate portion 41 is the horizontal direction, it approaches the horizontal direction. To proceed.

  Thus, according to the light emitting module 1 of the present embodiment, when the trapezoidal protrusion 43 bulging outward is formed on the side plate portion 42, when the direction in which the flat plate portion 41 is located is the front, The light that has passed through the inclined surface 63 is refracted forward or in a lateral direction substantially parallel to the flat plate portion 41. Thereby, when the front of the translucent cover 4 is set as the irradiation direction, the illuminance of the light emitted from the front to the lateral direction increases in the light emitted from the LED 3 through the side plate portion 42, Irradiation bias in the direction facing the flat plate portion 41 can be reduced, and the spread of light in the irradiation direction can be increased. Further, it can be realized with a simple configuration in which the protrusion 43 is added, and the cost can be reduced.

  In addition, by increasing only the refractive index of the protrusion 43 in the side plate portion 42 or by forming the protrusion 43 with a separate member larger than the refractive index of the side plate portion 42, the light emitted from the protrusion 43 is increased. Since the refraction can be made larger, the light directed forward or laterally can be further increased.

  Next, a modification of the above embodiment will be described with reference to FIG. In this modification, as shown in FIG. 5, the cross section of the protrusion 43a of the side plate portion 42 is semi-elliptical. Here, the length of the major axis of the semi-ellipse is d3, and the major axis d3 is longer than the thickness d1 of the flat plate portion 41, so that at least a part of the light incident on the side plate portion 42 causes the projection 43a. I try to pass.

  Thus, by making the cross section of the protrusion 43a semi-elliptical, the protrusion 43a can be made closer to a convex lens shape, and light incident on the protrusion 43a can be more easily refracted, and the protrusion 43a The entire semi-elliptical surface can be continuously refracted. Therefore, the light that has passed through the protrusion 43a can be more easily collected more uniformly, and the change in the illuminance distribution from the front to the lateral direction can be made more uniform. The cross section of the protrusion 43a may be semicircular.

  Next, the lighting fixture in the 2nd Embodiment of this invention is demonstrated with reference to FIG.6 and FIG.7. The lighting fixture 20 of this embodiment uses the light emitting module 1 of the said embodiment, reflects the light from the light emitting module 1 toward the front by the reflection part 21, and illuminates. FIG. 6 shows a configuration of the lighting fixture 20 of the present embodiment, and FIG. 7 shows a reflection state of light emitted from the light emitting module 1.

  As illustrated in FIG. 6, the lighting fixture 20 reflects light from the light emitting module 1 forward when the position of the light emitting module 1 and the flat plate portion 41 of the light transmitting cover 4 in the light emitting module 1 is the front. And a front panel 22 that covers the reflecting portion 21 so as to face the surface of the translucent cover 4 of the light emitting module 1. In addition, the lighting fixture 20 has a vertically long shape in which a plurality of light emitting modules 1 are arranged in a substantially straight line, and in the present embodiment, the light emitting modules 1 are arranged in the front, rear, left, and right directions so that light can be emitted in all directions. Is provided. The light emitted from the light fixture 20 passes through the front panel 22 after the light from the light emitting module 1 is directly or once reflected by the reflecting portion 21.

  The reflecting portion 21 includes a rectangular cylindrical casing 23 and four reflecting plates 24 (reflecting portions) formed to protrude outward along four corners in the longitudinal direction of the casing 23. These reflecting plates 24 are formed such that cross-sectional shapes perpendicular to the longitudinal direction of the casing 23 form an X shape, and the angles formed by the adjacent reflecting surfaces are substantially orthogonal. The reflector 24 is formed of, for example, a metal aluminum member or the like, and is on the side of the periphery of the protrusion 43 of the side plate portion 42 (see FIG. 7) in the light emitting module 1, and forwards the light emitted from the protrusion 43 to the front. It becomes a reflective surface for reflecting. Further, each reflector 24 and the two front panels 22 adjacent to each other are joined to each other at the ends in the longitudinal direction by screws (not shown) or an adhesive.

  With reference to FIG. 7, the direction in which the light from the light emitting module 1 attached to the reflecting portion 21 is reflected by the reflecting plate 24 will be described. In the present embodiment, similar irradiation can be performed in four orthogonal directions by the four reflecting plates 24, and here, an example of irradiation in one direction will be described. The light emitting module 1 is housed in a rectangular mounting jig 25 for mounting the light emitting module 1 to the reflecting portion 21, and a fitting convex portion is provided on the casing 23 of the reflecting portion 21 provided at the bottom of the mounting jig 25. By being fitted into the fitted groove 26, the reflecting portion 21 is fixed.

  Here, the light emitted from the light emitting module 1 is reflected forward by two reflecting plates 24 having a 45 ° inclination substantially symmetrical to the optical axis of the LED 3. At this time, among the light rays collected from the LED 3 through the protrusion 43 of the side plate 42, the light rays 32 b and 32 c that have passed through the lower inclined surface 63 of the protrusion 43 are obtained when the protrusion 43 is not present. Compared with the light emitted from the side plate portion 42, the light is reflected forward on the reflection surface farther from the optical axis at the center of the LED 3 of the reflection plate 24.

  Thereby, in this embodiment, the light from the light emitting module refracted through the protrusion 43 toward the front or in the lateral direction substantially parallel to the flat plate portion 41 is emitted from the side plate portion 42 when the protrusion 43 is not present. Compared with the emitted light, the light is emitted forward from a position on the reflecting surface further away from the optical axis of the LED 3, so that the spread of reflected light by the reflecting plate 24 increases. Accordingly, it is possible to avoid the uneven irradiation in which only the portion facing the light emitting module 1 on the front panel 22 is bright, and the front panel 22 is uniformly irradiated. Therefore, the front panel 22 is more uniform in a wider irradiation range. Lighting is possible.

  In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible suitably in the range which does not change the meaning of invention. For example, in the above-described embodiment, the position of the protrusion is provided at the corner with the flat plate portion on the side plate portion, but may be anywhere as long as the light incident on the side plate portion passes through the protrusion. Further, the protrusion may be only a portion where the bulge increases toward the flat plate portion along the side plate portion, and the cross section thereof may be a right triangle, a quarter ellipse or a circle. The translucent cover may be formed in a cylindrical shape or a polygonal column shape instead of a rectangular casing. A plurality of LEDs in the light emitting module may be provided in an array.

The partially broken perspective view of the light emitting module which concerns on the 1st Embodiment of this invention. Sectional drawing of the module. The figure which shows the light ray radiate | emitted from the translucent cover of the module. The figure which shows the detail of the light ray radiate | emitted from the protrusion of the translucent cover of the module. The figure which shows the light ray which passed the protrusion part of the light emitting module which concerns on the modification of the said 1st Embodiment. The partially broken perspective view of the lighting fixture which concerns on the 2nd Embodiment of this invention. The figure which shows the light beam reflected by the partially broken cross section and reflection part of the lighting fixture. Sectional drawing of the conventional light emitting module.

Explanation of symbols

1 Light Emitting Module 2 Wiring Board (Board)
3 LED (light emitting diode)
DESCRIPTION OF SYMBOLS 30 Light emission surface 4 Translucent cover 41 Flat plate part 42 Side board part 43 Projection part 20 Lighting fixture 21 Reflection part 24 Reflection board (reflection part)

Claims (2)

A light emitting module comprising: a light emitting diode mounted on a substrate; and a translucent cover covering the light emitting diode; and emitting light from the light emitting diode through the translucent cover,
The translucent cover has a flat plate portion facing the light emitting surface of the light emitting diode and spaced from the light emitting diode, and a side plate portion hanging from the periphery of the flat plate portion to the substrate toward the light emitting diode. The light emitting module is characterized in that the side plate portion is formed with an outwardly protruding protrusion capable of collecting light emitted from the light emitting diode through the side plate portion. A lighting fixture comprising: the light emitting module according to claim 1; and a reflecting portion that reflects light from the light emitting module forward.
The said reflection part is a peripheral side of the protrusion of the said side plate part at least, and has the reflective surface which reflects the light radiate | emitted from this protrusion ahead, The lighting fixture characterized by the above-mentioned.

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