JP2013045921A - Light emitting device and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device which achieves high luminous efficiency and wide light distribution with a simple structure.SOLUTION: A line module 110 comprises a cover 111 formed into a plate shape. The cover 111 allows light radiated from an LED 112 to enter from one plate surface 111a, diffuses the incident light, and emits the light from the other plate surface 111a and two side surfaces 111c and 111d. The side surfaces 111c, 111d respectively incline so that an area of the other plate surface 111b becomes larger than an area of the one plate surface 111a.

Description

  The present invention relates to a light emitting device and a lighting device. The present invention particularly relates to a line-type LED (light emitting diode) illumination module used as a store lamp, an office lamp, or the like.

  In recent years, with the increase in the amount of light of white LEDs, LEDs have been widely used as illumination. However, the directivity of LED light is strong, and when compared with fluorescent lamp fixtures and LED fixtures, fluorescent fixtures feel brighter even among fixtures having the same luminous flux value. Therefore, attempts have been made to diffuse and spread the light of the LED (for example, see Patent Document 1).

JP 2006-19160 A

  Conventionally, like the method of Patent Document 1, the light of the LED is diffused by an optical member such as a lens or a reflection diffusing member. However, the luminous flux is inevitably dropped, and the luminous efficiency of the instrument is lowered. There has been a problem that the configuration (part arrangement, shape, etc.) of the instrument becomes complicated.

  An object of the present invention is, for example, to provide a light-emitting device with a simple configuration and high luminous efficiency and wide light distribution.

A light emitting device according to one embodiment of the present invention includes:
A light source that emits light;
A cover that is formed in a plate shape and that receives light emitted from the light source from one plate surface, diffuses the incident light, and emits the light from the other plate surface and at least one side surface; A cover whose at least one side surface is inclined so that an area of the other plate surface is larger than an area of the surface.

  In one aspect of the present invention, in the light emitting device, at least one side surface of the cover is inclined so that the area of the other plate surface is larger than the area of one plate surface of the cover formed in a plate shape. Therefore, according to one embodiment of the present invention, a light-emitting device with a simple structure and high emission efficiency and wide light distribution can be provided.

1 is a perspective view of a lighting device according to Embodiment 1. FIG. FIG. 2 is a partial cross-sectional view of the lighting device according to Embodiment 1 taken along line AA. FIG. 6 is a partial cross-sectional view taken along line AA of the lighting device according to Embodiment 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment, the directions such as “up”, “down”, “left”, “right”, “front”, “back”, “front”, “back” are However, it is not intended to limit the arrangement or orientation of devices, instruments, parts, or the like.

Embodiment 1 FIG.
FIG. 1 is a perspective view of lighting apparatus 100 according to the present embodiment. FIG. 2 is a cross-sectional view in which one module of the AA cross section of FIG.

  In FIG. 1, the lighting device 100 includes a line module 110 and a housing 115. Each of the six elongated rectangular regions shown in FIG. 1 is a light emitting surface of the line module 110, and the lighting device 100 is fixed to a ceiling or the like so that the light emitting surface of the line module 110 faces downward, for example. Used. In the present embodiment, six line modules 110 are attached to the housing 115 so that three line modules 110 are arranged in two rows along the longitudinal direction. The number and arrangement of the line modules 110 are the same as those of the lighting device. You may change suitably according to a 100 use etc. In the present embodiment, the line module 110 is an example of a light-emitting device. If the line module 110 has the characteristics described later, it is replaced with a light-emitting device having a shape other than a straight shape such as a circular shape or a ring shape. It doesn't matter.

  In FIG. 2, the line module 110 includes a cover 111, an LED 112, an LED mounting board 113, and a reflector 114. Although not shown, the line module 110 also includes a power source for lighting the LEDs 112 and the like.

  The LED mounting substrate 113 is, for example, an inexpensive glass epoxy substrate or a metal substrate having an insulating layer formed on the surface. On the LED mounting substrate 113, a plurality of LEDs 112 are arranged in a line in a straight line. In the present embodiment, the number and arrangement of the LEDs 112 may be changed as appropriate according to the application of the lighting device 100 and the like.

  Although not shown, a conductive pattern for supplying power from the power source to the LED 112 is formed on the LED mounting substrate 113. Although not shown, the LED mounting substrate 113 is fixed to the heat dissipation system so that heat can be easily transferred to the heat dissipation system including the housing 115 and a heat dissipation member (for example, a heat sink) attached to the housing 115. ing. When the casing 115 itself is a component of the heat dissipation system, the casing 115 is formed of aluminum, a steel plate, or the like.

  The LED 112 is an example of a light source that emits light. The LED 112 is, for example, a white LED, and is an SMD (surface mount component) type LED in the figure, but may be a bullet type LED. The LED 112 has a configuration of, for example, a general white LED, a blue LED, a highly transparent phosphor-containing resin layer provided so as to cover the LED, and a package made of a resin such as ceramics surrounding the LED 112 It consists of. The LED 112 has an electrode for electrically connecting to the conductive pattern described above. The blue LED is connected to the electrode by a gold wire, and emits light by electric power supplied from the electrode. The phosphor mixed in the phosphor-containing resin layer is, for example, a YAG (yttrium, aluminum, garnet) phosphor, excited by light emitted from a blue LED, and having a spectrum between 480 and 780 nm (nanometers), It emits light having a dominant wavelength around 560 nm. Since the light emitted from the blue LED and the light emitted from the phosphor are in a complementary color relationship, the combined light has a pseudo white color. The material of the phosphor-containing resin layer is an epoxy resin or a silicone resin. Since the light flux of the LED element is reduced by heat, it is preferable to use a silicone resin that is excellent in heat resistance, chemical resistance, self-lubricating property, and friction resistance, and has high stability compared to an epoxy resin. In the present embodiment, the LED 112 may be replaced with another type of light source such as an organic EL (electroluminescence).

  The reflector 114 is made of a resin such as white polycarbonate having a high effect of diffusing light. The reflector 114 is provided with an opening 114a. The reflector 114 has an inclined structure, and the light irradiated from the LED 112 is reflected and diffused by the inclined portion, and is emitted from the opening 114a.

  The cover 111 is attached to the reflector 114 so as to cover the opening 114 a of the reflector 114. The cover 111 is formed in a plate shape and has two plate surfaces 111a and 111b and two side surfaces 111c and 111d. The cover 111 receives light emitted from the LED 112 (including light reflected by the reflector 114) from one plate surface 111a and diffuses the incident light to diffuse the other plate surface 111b and the two side surfaces 111c and 111d. And exit. The side surfaces 111c and 111d are inclined so that the area of the other plate surface 111b is larger than the area of the one plate surface 111a. Therefore, the cover 111 has a trapezoidal cross section. Note that only one of the side surfaces 111c and 111d may be inclined. Alternatively, not only the side surfaces 111c and 111d (side surfaces extending along the longitudinal direction of the cover 111) but also one or more other side surfaces (side surfaces extending along the short side direction of the cover 111) are inclined. It may be.

  The cover 111 is made of, for example, a transparent or translucent acrylic resin. As described above, the cover 111 is inclined in the longitudinal direction, and has a trapezoidal shape when viewed from the AA cross-sectional direction (short direction) in FIG. In the cover 111, the surface near the LED 112 (plate surface 111a) has the same area as the end surface where the opening 114a of the reflector 114 is located, and the surface far from the LED 112 (plate surface 111b) is from this end surface. Also has a large area. That is, the light emitting side plate surface 111b has a larger area than the light incident side plate surface 111a.

  The line module 110 is attached to the housing 115 so that at least a part of the cover 111 (a part or the whole including the plate surface 111b on the light emitting side) protrudes outside the surface 115a. That is, the line module 110 is attached to the housing 115 so that at least a part of the cover 111 protrudes from the housing 115. For this reason, the light emitted (leaked) from the side surfaces 111 c and 111 d of the cover 111 is reflected by the surface 115 a of the housing 115. Thereby, the light distribution of the line module 110 can be converted into a wide light distribution. The casing 115 is preferably formed of a material having high reflectivity at least at a portion including the surface 115a so that the surface 115a can easily reflect light, or the surface 115a is processed with a reflective coating or the like. .

  In the present embodiment, the line module 110 is attached to the housing 115 so that the entire cover 111 protrudes outside the surface 115 a of the housing 115. That is, in this embodiment, the line module 110 is attached to the housing 115 so that the entire cover 111 protrudes from the housing 115. Therefore, the light emitted from the entire side surfaces 111c and 111d of the cover 111 can be reflected by the surface 115a of the housing 115, and the light emission efficiency of the lighting device 100 can be improved.

  Specifically, in the present embodiment, the entire cover 111 protrudes from the housing 115 by 0.5 to 10 mm (millimeters). Further, the cover 111 has an inclination angle θ in the longitudinal direction, and the light reflected from the light emitting side (plate surface 111b) of the cover 111 is a surface (side surfaces 111c and 111d) inclined in the longitudinal direction. The angle is 45 ° or less so that the light passes through the housing 115 without being reflected.

  As described above, in the present embodiment, the line module 110 is attached to the housing 115 such that the distance between the surface 115a of the housing 115 and the one plate surface 111a of the cover 111 is a predetermined distance. If this distance is 0.5 to 10 mm as described above, the light emitted from the side surfaces 111c and 111d of the cover 111 is reflected by the surface 115a of the housing 115 in a certain range near the line module 110. Can do. Therefore, it is possible to avoid a situation where the light distribution of the line module 110 becomes too wide and the uniformity of light and the light emission efficiency are impaired. Note that the distance between the surface 115a of the housing 115 and the plate surface 111a of the cover 111 may be appropriately changed according to the size and shape of the cover 111 or other components of the line module 110 (0. Shorter than 5 mm or longer than 10 mm).

  In the present embodiment, the angle θ formed between the side surfaces 111c and 111d of the cover 111 and the surface 115a of the housing 115 is 45 ° or less. That is, the cover 111 is inclined at an angle of 45 degrees or less with respect to the surface 115a of the housing 115 at the side surfaces 111c and 111d. For this reason, the light emitted from the side surfaces 111 c and 111 d of the cover 111 easily reaches the surface 115 a of the housing 115.

  Therefore, according to the present embodiment, a large amount of light is emitted from the side surfaces 111 c and 111 d of the cover 111 and reflected by the surface 115 a of the housing 115, so that a wide range can be illuminated by the lighting device 100. That is, in this embodiment, an effect is obtained that light having a narrow light distribution and high directivity of the LED 112 can be converted into soft light.

  As described above, in the present embodiment, the narrow light distribution of the LED 112 can be converted into the wide light distribution with a small number of components without using an optical member that lowers the light emission efficiency such as a lens. That is, according to this embodiment, a light-emitting device with a simple configuration and high luminous efficiency and wide light distribution can be provided.

  In addition, as an application example of the present embodiment, there is an illumination device 100 such as an office grid illumination that lights a combination of a plurality of line modules 110.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 3 is a diagram corresponding to FIG. 2, and is a partial cross-sectional view taken along line AA of lighting apparatus 100 according to the present embodiment.

  In FIG. 3, the housing 115 has an inclination parallel to the inclination formed along the longitudinal direction of the cover 111 toward the LED mounting substrate 113. That is, in the present embodiment, in the housing 115, a portion of the surface 115 a that reflects light emitted from the side surfaces 111 c and 111 d of the cover 111 is parallel to the side surfaces 111 c and 111 d of the cover 111. It is inclined and forms inclined surfaces 115b and 115c. For this reason, compared with Embodiment 1, the light radiate | emitted from the side surfaces 111c and 111d of the cover 111 reaches | attains the surface 115a (inclined surface 115b, 115c) of the housing | casing 115 easily.

  Similar to the first embodiment, in this embodiment, the line module 110 has a predetermined distance (for example, 0.5 to 10 mm) between the surface 115a of the casing 115 and one plate surface 111a of the cover 111. It attaches to the housing | casing 115 so that it may become. Therefore, the light emitted from the entire side surfaces 111c and 111d of the cover 111 can be reflected by the surface 115a of the housing 115, and the light emission efficiency of the lighting device 100 can be improved.

  In the present embodiment, portions (horizontal planes) other than the inclined surfaces 115b and 115c in the surface 115a of the housing 115 and the plate surface 111b on the light emitting side of the cover 111 (upper ends of the side surfaces 111c and 111d) are perpendicular to each other (line). In the height direction of the module 110, the thickness direction of the cover 111, and the optical axis direction of the LED 112), they are substantially at the same position. For this reason, most of the light emitted from the side surfaces 111 c and 111 d of the cover 111 reaches the inclined surfaces 115 b and 115 c of the housing 115. Moreover, since the cover 111 does not protrude from the housing 115, the design is improved.

  Therefore, according to the present embodiment, a large amount of light is emitted from the side surfaces 111c and 111d of the cover 111, and most of the light is reflected by the surface 115a of the housing 115, so that the luminous efficiency of the lighting device 100 is increased. Can do.

  The inclined surfaces 115b and 115c of the housing 115 do not necessarily have to be inclined so as to be parallel to the side surfaces 111c and 111d of the cover 111, and may be inclined at another angle. For example, in this embodiment, by adjusting the width of the inclination provided in the housing 115, that is, the inclination angle of the inclined surfaces 115b and 115c of the housing 115, the area and direction illuminated by the lighting device 100 are changed. Is possible. That is, according to the present embodiment, by changing the inclination angle of the inclined surfaces 115b and 115c (the inclination angle of the inclined surface 115b may be different from the inclination angle of the inclined surface 115c), the arrangement of the line module 110 is changed. The light can be adjusted to the desired light distribution. Therefore, for example, it is possible to prepare a plurality of casings 115 having different inclination angles of the inclined surfaces 115b and 115c and select the casing 115 to which the line module 110 is attached according to the use of the lighting device 100 or the like. is there.

  As mentioned above, although embodiment of this invention was described, you may implement in combination of 2 or more among these embodiment. Alternatively, one of these embodiments may be partially implemented. Alternatively, two or more of these embodiments may be partially combined. In addition, this invention is not limited to these embodiment, A various change is possible as needed.

  DESCRIPTION OF SYMBOLS 100 Illuminating device, 110 line module, 111 cover, 111a, 111b board surface, 111c, 111d side surface, 112 LED, 113 LED mounting board, 114 reflector, 114a opening part, 115 housing | casing, 115a surface, 115b, 115c inclined surface.

Claims (8)

A light source that emits light;
A cover that is formed in a plate shape and that receives light emitted from the light source from one plate surface, diffuses the incident light, and emits the light from the other plate surface and at least one side surface; And a cover having at least one side surface inclined so that an area of the other plate surface is larger than an area of the surface. A light emitting device according to claim 1;
A housing to which the light emitting device is attached so that at least a part of the cover protrudes outside the surface, and a housing that reflects light emitted from the at least one side surface of the cover on the surface. A lighting device characterized by that.   The lighting device according to claim 2, wherein the light emitting device is attached to the housing such that a predetermined distance is provided between the surface of the housing and the one plate surface of the cover.   4. The lighting device according to claim 2, wherein a portion of the surface that reflects light emitted from the at least one side surface of the cover is inclined.   The lighting device according to claim 4, wherein an inclined portion of the housing is parallel to the at least one side surface of the cover.   The lighting device according to claim 2, wherein the at least one side surface of the cover is inclined at an angle of 45 degrees or less with respect to the surface of the housing. The light emitting device further includes a reflector that is provided with an opening, reflects the light emitted from the light source, and emits the light from the opening.
The lighting device according to claim 2, wherein the cover is attached to the reflector so as to cover the opening of the reflector.   The lighting device according to claim 2, wherein two sides are inclined as the at least one side so that a cross section of the cover has a trapezoidal shape.