JP2014182940A - Light emitting module and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting module and a lighting device which can make a manufacturing cost of the device low-cost, permits the thinning of the device and can obtain uniform and even lighting light as well as use an LED element as a light source.SOLUTION: A light emitting module includes a light emitting element and a translucent member. Therein, the translucent member has a light emission surface which transmits light emitted from the light emitting element and proceeding to translucent member, and takes out lighting light. The light emitting element is provided such that the optical axis thereof is inclined at an angle which is larger than 10° and is smaller than 80° for the normal of the light emission surface of the translucent member.

Description

  Embodiments of the present invention relate to, for example, a lighting device attached to a ceiling, and more particularly, to a lighting device including a flat light emitting module using a light emitting diode (LED) as a light source.

  In recent years, a base light using an LED as a light source has been widely used as a lighting device attached to a ceiling. This type of base light includes a substrate on which a plurality of LED elements are mounted, a power feeding device that supplies power to the substrate, a reflector, a light-transmitting cover that faces the light extraction side, that is, the mounting surface side of the substrate. The translucent cover functions to obtain uniform and uniform illumination light by diffusing and transmitting the light emitted from the LED element which is a point light source.

JP 2011-249219 A

  However, LED elements are generally known to have strong light directivity, and light cannot be sufficiently diffused only by passing through a translucent cover. For this reason, for example, an optical filter for diffusing light is provided between the LED element and the cover. For this reason, there are problems that the number of parts increases, the manufacturing cost of the device increases, and the thickness of the device increases.

  Therefore, it is desired to develop a light emitting module and a lighting device that can reduce the manufacturing cost of the device, reduce the thickness of the device, and obtain uniform and uniform illumination light using an LED element as a light source. Yes.

  The light emitting module according to the embodiment includes a light emitting element and a light transmissive member, and the light transmissive member has a light emitting surface that transmits light emitted from the light emitting element and extracts illumination light. The light emitting element faces the translucent member, and its optical axis is inclined at an angle greater than 10 degrees and smaller than 80 degrees with respect to the normal line of the light emitting surface of the translucent member.

  According to the present invention, the manufacturing cost of the device can be reduced, the device can be thinned, and uniform and uniform illumination light can be obtained after the LED element is used as a light source.

FIG. 1 is an external perspective view showing a base light according to the first embodiment. FIG. 2 is a plan view of the base light of FIG. 1 viewed from the illumination light extraction side. FIG. 3 is an exploded perspective view of the base light of FIG. FIG. 4 is a cross-sectional view of the base light taken along the line YY of FIG. FIG. 5 is a partially enlarged cross-sectional view in which the portion A of FIG. 4 is enlarged. FIG. 6 is a cross-sectional view showing a light emitting module according to the second embodiment. FIG. 7 is a cross-sectional view showing a modification of FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view showing a state in which the base light 100 (illumination device) according to the first embodiment is attached to the ceiling C. FIG. FIG. 2 is a plan view of the base light 100 as viewed from the illumination light extraction side. FIG. 3 is an exploded perspective view of the base light 100. 4 is a cross-sectional view of the base light 100 taken along line YY of FIG. FIG. 5 is a partially enlarged cross-sectional view in which the portion A of FIG. 4 is enlarged. The base light 100 is formed in an elongated flat and substantially rectangular plate shape. In the following description, the illumination light extraction side (lower side) is referred to as the front side, and the side toward the ceiling C (upper side) is referred to as the back side.

  The base light 100 is an elongated, substantially rectangular plate-like chassis 1, a plurality of strip-like light source portions 2 attached to the front side of the chassis 1, and milky white and translucent covering the plurality of light source portions 2. An elongate tube-shaped cover member 3 (translucent member), a lighting device 4 for controlling lighting of the light source unit 2, a center cover 5 having a substantially V-shaped cross section attached to a central portion of the chassis 1, and two side plates 6 And.

  The chassis 1 is formed by processing a metal plate having thermal conductivity such as a hot-dip galvanized steel plate. The chassis 1 has a function of attaching a plurality of constituent members of the base light 100, a function as a heat radiating member for releasing heat generated in the light source unit 2, and a function as a strength member that imparts mechanical strength to the base light 100. And bear.

  The chassis 1 has a flat top plate surface 11 at the center, and two long and narrow arrangement portions 12 and 12 for attaching the back surfaces of the plurality of light source units 2 in contact with both end edges along the longitudinal direction. Have Each arrangement part 12 is formed integrally by bending the chassis 1 along a line along the longitudinal direction so that a part of the chassis 1 protrudes to the front side, and the back of the light source part 2 is brought into contact with the protruding top part. And has an elongated flat surface to be thermally coupled. The arrangement part 12 of the present embodiment has a length that exceeds the length in which the three light source parts 2 are connected. In other words, the two arrangement portions 12 are provided over the entire length of the chassis 1 and also serve as reinforcing ribs that increase the mechanical strength along the longitudinal direction of the chassis 1.

  Further, attachment holes 11 a penetrating through the chassis 1 are formed near both longitudinal ends of the top plate surface 11 of the chassis 1. A pair of mounting bolts (not shown) extending downward from the structure of the building inside the ceiling C are penetrated from the back side to the mounting hole 11a and arranged on the front side of the chassis 1. The chassis 1 is fixed to the ceiling surface C by fastening with a nut (not shown).

  The light source unit 2 includes an elongated rectangular belt-shaped substrate 21, a plurality of LED chips 22 mounted on the surface of the substrate 21, a phosphor layer 23 that covers each LED chip 22, and a lens body that covers each phosphor layer 23. 24. In the following description, the LED chip 22, the phosphor layer 23, and the lens body 24 are collectively referred to as the light emitting element 20. In FIG. 2, in order to make the structure of the light source unit 2 easy to see, one (upper side in the drawing) cover member 3 is shown transparent.

  The board | substrate 21 is formed in the elongate rectangular shape with materials, such as glass epoxy resin (FR-4) which is an insulating material. A wiring pattern layer made of copper foil is formed on the surface side, and a resist layer is formed on the wiring pattern layer. In addition, the material of the substrate 21 is a ceramic plate, a synthetic resin material, or one surface of a base plate that has good thermal conductivity such as aluminum and has excellent heat dissipation for enhancing the heat dissipation of the LED chip 22 of each light emitting element 20. In addition, a metal base substrate having an insulating layer laminated thereon can be used, and the material is not particularly limited.

  In addition, a white resist layer having a high reflectance is laminated on almost the entire surface of the surface of the substrate 21 except for the mounting area of the LED chip 22 and the mounting part of the components. Thereby, among the light emitted from the light emitting element 20, the light reflected by the inner surface of the cover member 3 or the like is reflected by the surface of the white resist layer having a high reflectance and is emitted to the front side.

  As the plurality of LED chips 22 made of bare chips, for example, those emitting blue light are used in order to cause the light source unit 2 to emit white light. The LED chip 22 is bonded onto the wiring pattern layer using a silicone resin-based insulating adhesive, and is electrically connected to the wiring pattern layer by a bonding wire.

  The phosphor layer 23 is made of a translucent synthetic resin, for example, a transparent silicone resin, and contains an appropriate amount of a phosphor such as YAG: Ce. The phosphor layer 23 has a substantially hemispherical shape with a small height so as to cover each LED chip 22 for each chip. The phosphor is excited by the light emitted from the LED chip 22 and emits light of a color different from the color of the light emitted from the LED chip 22. In the present embodiment, since the LED chip 22 emits blue light, yellow fluorescent light that emits yellow light that is complementary to the blue light is emitted to the phosphor so that the light source unit 2 can emit white light. The body is used.

  The shape of the phosphor layer 23 is not particularly limited as long as each LED chip 22 can be covered, and is not limited to a hemispherical shape. Further, as the LED chip 22, a surface-mount type LED package may be used, and the mounting method and format are not particularly limited.

  The lens body 24 is formed of a synthetic resin having translucency, and is provided so as to cover the LED chip 22 and the phosphor layer 23. The lens body 24 has a flat polarizing surface 24a inclined on the outer surface thereof, and the optical axis O of the light emitted from the light emitting element 20 is inclined in a predetermined direction so as to deflect the emitted light in a desired direction. Function.

  In the present embodiment, the optical axis O of the light emitted from the light emitting element 20 and passing through the polarization plane 24a is inclined outward from the center of the base light 100, and the outer corner 3b of the cover member 3 described later. The polarization plane 24a of the lens body 24 is inclined so as to pass (see FIG. 5). In this case, the optical axis O is orthogonal to the polarization plane 24a. The light emitting element 20 is provided at a position offset from the center of the substrate 21 (that is, the light emitting module 30) to the side opposite to the side where the optical axis O is inclined (right side in FIG. 5).

  As shown in FIG. 4, the two sets of light source units 2 arranged on both sides in the width direction of the chassis 1 are polarized so that the optical axes O are inclined in directions away from each other (outward). It has the light emitting element 20 in which the surface 24a was inclined. In other words, on both sides of the base light 100 in the width direction, the light emitting elements 20 of the light source unit 2 have a shape that is symmetric with respect to the center of the base light 100 and are disposed at positions that are symmetric with respect to the center. . That is, the light emitting element 20 is disposed at a position near the center of the base light 100.

  When viewed along the longitudinal direction of the substrate 21, a plurality of light emitting elements 20 are arranged in a line at equal intervals along the longitudinal direction of the substrate 21, as shown in FIGS. 2 and 3. In the present embodiment, the lens bodies 24 of all the light emitting elements 20 have the polarization plane 24a inclined in the same direction. In other words, the polarization plane 24 a of each lens body 24 is inclined at the angle described above in the short direction perpendicular to the longitudinal direction of the substrate 21. In the light emitting element 20 of the present embodiment, since the lens body 24 is formed of a translucent resin, not all the light emitted from the LED chip 22 is emitted through the polarization plane 24a. Light is also emitted from other than the polarization plane 24a. In any case, the light emitting element 20 faces the front surface portion 3b of the cover member 3.

  The light source unit 2 having the above structure is connected to the cover member 3 in the longitudinal direction. In the present embodiment, three light source units 2 are connected and mounted in one cover member 3, and a total of six light source units 2 are incorporated in the base light 100. In the case of configuring a longer base light, the number of light source units 2 connected in the longitudinal direction is increased.

  Adjacent ends of each light source unit 2 are connected via a wiring Z shown in FIG. Further, the wiring Z is also derived from at least one end of the light source units 2 at both ends of the connected light source units 2. Then, the wiring Z led out from this end is connected to the lighting device 4 attached to the chassis 1 so that power can be supplied to each light source unit 2.

  The cover member 3 includes a front surface portion 3 a that covers the front surface side of each light source portion 2, and a slit-shaped opening portion 31 that exposes the back surface of each light source portion 2. For this reason, by attaching the cover member 3 to the chassis 1, the back surface of the substrate 21 of each light source unit 2 comes into contact with the flat surface of the arrangement portion 12 in the chassis 1 through the open portion 31. It is thermally coupled to the chassis 1.

  For this reason, the surface of the board | substrate 21 of each light source part 2 becomes parallel to the ceiling C, and extends horizontally. In addition, the cover member 3 of the present embodiment has a front surface portion 3a that bulges slightly so as to protrude to the front surface side, and the front surface portion 3a is also disposed substantially parallel to the ceiling C. That is, according to the present embodiment, the outer surface of the front surface portion 3a functions as the light emitting surface 30a substantially parallel to the ceiling C.

  The cover member 3 is formed of a milky white insulating material having translucency such as an acrylic resin or a polycarbonate resin. In the present embodiment, the cover member 3 is formed by extrusion molding of polycarbonate. The cover member 3 is formed in a long tube shape, and is attached to the arrangement portions 12 formed on both sides of the chassis 1. The cover member 3 has substantially the same length as the arrangement portion 12. Note that openings 32 for inserting the light source unit 2 are provided at both ends in the longitudinal direction of the cover member 3.

  For example, as shown in FIG. 5, a pair of holding grooves 33 that are opened opposite to each other are formed over the entire length at the edge portion along the longitudinal direction of the opening portion 31. The pair of holding grooves 33 are formed between the front side support part 33a and the back side support part 33b along the longitudinal direction. In addition, a pair of locking portions 34 that are substantially U-shaped in cross section and open to the inside are formed outside the holding groove 33 over the entire length in the longitudinal direction.

  Both ends of the plurality of light source units 2 along the longitudinal direction of the substrates 21 are inserted into the pair of holding grooves 33 facing each other in the cover member 3. Specifically, as shown in FIG. 3, three light source parts 2 are connected by wiring Z and inserted from one opening 32 of the cover member 3, and both ends of each light source part 2 along the longitudinal direction of the substrate 21. The edge is guided and held by the pair of holding grooves 33. As a result, the light source unit 2 is held by the cover member 3 and integrated with the cover member 3.

  In addition, lids 35 that close the openings 32 are attached to the openings 32 at both ends in the longitudinal direction of the cover member 3. The light source unit 2 integrated with the cover member 3 and closed at both ends with the lid 35 is referred to as a light emitting module 30. That is, as described above, after the three light source portions 2 are mounted in the pair of holding grooves 33 of the cover member 3, the lid body 35 is attached so as to close both ends of the cover member 3. Thus, by attaching the lid body 35 to the openings 32 at both ends of the cover member 3, it is possible to prevent the light source unit 2 from falling out of the cover member 3.

  The lid 35 has an insulating property, is formed of a light-transmitting material having light diffusibility from the surface to the inside of the material, and is milky white like the cover member 3. For this reason, the light emitted from the light source unit 2 can be irradiated to the outside through the lid 35.

  The position of the lid 35 is regulated by being combined with a side plate 6 described later. Furthermore, a wiring Z that connects the end of the substrate 21 and the lighting circuit 4 exists between the back side of the lid 35 and the front surface of the end of the chassis 1. The wiring Z led out from the end portion of the substrate 21 must pass through the end portion of the chassis 1 before reaching the lighting device 4. However, since the lid 35 on the front surface of the wiring Z conducts light, the light is emitted. The presence of the wiring Z present at the end of the main body becomes inconspicuous.

  The lighting device 4 is attached to the front side of the top plate portion 11 of the chassis 1. The lighting device 4 controls lighting of the light source unit 2 and is configured by accommodating a circuit board on which a plurality of circuit components are mounted in a box-like case. This lighting device 4 is connected to a commercial AC power source (not shown), and converts AC to DC and outputs it. The lighting device 4 is configured, for example, by connecting a smoothing capacitor between output terminals of a full-wave rectifier circuit, and connecting a DC voltage conversion circuit and current detection means to the smoothing capacitor. The lighting device 4 is connected to the LED chip 22 via the substrate 21, supplies the direct current output to the LED chip 22, and controls the lighting of the LED chip 22.

  A terminal block 7 is attached to the front side of the top plate 11. The terminal block 7 is connected to wirings not shown here such as a power supply line, a feed line, and a dimming signal line. The lighting device 4 dims the light source unit 2 based on the dimming signal.

  The center cover 5 is disposed on the front side of the top plate portion 11 of the chassis 1. The center cover 5 is formed from a metal plate such as a hot-dip galvanized steel sheet, and the side surface has a V shape. Further, at least the surface side is coated with white and functions as a reflector.

  A plurality of attachment tongues 52 are formed on an edge 51 (see FIG. 3) along the longitudinal direction in which the center cover 5 expands. On the other hand, on the chassis 1 side facing the mounting tongue piece 52, an insertion hole 14 formed by being slightly bulged and deformed to the front side by cutting is formed.

  The center cover 5 is capable of reducing the width dimension to be expanded by elastically deforming the expanding edge 51 in the width direction around the V-shaped top. Therefore, when the center cover 5 is attached to the chassis 1, the center cover 5 is elastically deformed so as to reduce the width of the center cover 5, the attachment tongue 52 is aligned with the position of the insertion hole 14, and the elastic deformation is released. Return to the original state. Thereby, the attachment tongue piece 52 is inserted into the insertion hole 14, and the center cover 5 is attached to the chassis 1.

  When the center cover 5 is thus attached to the chassis 1, the edge 51 of the center cover 5 is brought into contact with the fixed piece portion 36 b of the stopper member 36. Therefore, for example, even if the mounting screw 36c of the stopper member 36 is loosened due to vibration with time or the like, the stopper member 36 can be prevented from coming off or excessively moving. Thereby, it can be expected that the thermal coupling between the chassis 1 and the substrate 21 is ensured.

  In addition, the lighting device 4, the terminal block 7, the wiring, and the like are covered with the center cover 5 and cannot be visually recognized from the outside, and the appearance is not impaired. Further, the side plate 6 is made of a synthetic resin material, and is attached so as to close both ends of the chassis 1 in the longitudinal direction.

Here, the illumination light when the base light 100 having the above structure is turned on will be considered mainly with reference to FIG.
According to the present embodiment, as described above, since the light emitting element 20 has the polarization plane 24a inclined with respect to the light emitting surface 30a (normal line) of the cover member 3, the optical axis O of the light emitting element 20 is light. It is not orthogonal to the exit surface 30a. In particular, in this embodiment, the inclination angle of the polarization plane 24a of the lens body 24 is set so that the optical axis O of the light emitting element 20 passes through the farthest corner portion 3b of the cover member 3, and the light emitting element 20 is placed on the optical axis. Since it is arranged so as to be offset to the side opposite to the inclined side of O, the strongest light component of the light emitted from the light emitting element 20 passes through the portion of the cover member 3 at the farthest position. Thereby, the brightness nonuniformity of the illumination light which passed the cover member 3 can be suppressed.

  On the other hand, for example, when the light emitting element mounted on the surface of the substrate 21 does not have the lens body 24 of the present embodiment, the light from the LED chip 22 passes through the phosphor layer 23 and away from the surface of the substrate 21. The light is emitted (vertically below) and passes straight through the light exit surface 30a of the cover member 3. In this case, the optical axis O of the light emitted from the light emitting element is orthogonal to the light emitting surface 30a, and the portion of the cover member 3 where the strongest light component of the light emitted from the light emitting element is immediately close is selected. Will pass.

  As described above, when the optical axis O of the light emitting element is orthogonal to the light emitting surface 30a, that is, when the optical axis O is parallel to the normal line of the light emitting surface 30a, the optical path until the emitted light passes through the cover member 3. The length becomes shorter, and the illumination light extracted through the cover member 3 includes a spot-like bright part, resulting in spot-like luminance unevenness. Such dot-like luminance unevenness is considered to be caused by the strong directivity of the light emitted from the LED chip 22. In particular, when the light emitting module 30 is thinned to reduce the thickness of the base light 100, the distance between the surface of the substrate 21 and the front surface portion 3a of the cover member 3 needs to be shortened. The brightness unevenness becomes remarkable.

  Therefore, in the present embodiment, the optical axis O of the light emitting element 20 is inclined, and the light emitting element 20 is arranged so as to be offset on the opposite side to the inclined side, so that the strongest light passes through the cover member 3. I tried to make the optical path length as long as possible. In this case, when considering a suitable inclination angle of the polarization plane 24a of the light emitting element 20, the optical axis O of the light emitting element 20 is inclined at an angle greater than 0 degree and less than 90 degrees with respect to the normal line of the light exit surface 30a. It is necessary to make the angle that can be made. That is, when the optical axis O of the light emitting element 20 is parallel to the normal line of the light emitting surface 30a, the above-described dot-like luminance unevenness is likely to occur, and the optical axis O of the light emitting element 20 is orthogonal to the normal line of the light emitting surface 30a. If it is made (that is, parallel to the substrate 21), the main part of the light emitted from the light emitting element 20 will not pass through the front surface portion 3a of the cover member 3.

  In the base light 100 of the present embodiment, the polarization plane 24a of the light emitting element 20 is variously changed, and an appropriate inclination angle of the polarization plane 24a that can obtain good illumination light that does not show dotted luminance unevenness is obtained. As a result of investigation, it was found that good illumination light can be obtained when the angle is set to be greater than 15 degrees and smaller than 60 degrees with respect to the light exit surface 30a.

  As described above, according to the present embodiment, since the optical axis O of the light emitting element 20 including the LED chip 22 is inclined, the light emitted from the light emitting element 20 passes through the cover member 3 (light emitting surface 30a). The optical path length can be extended, and uneven brightness can be suppressed. In particular, in the present embodiment, the light emitting element 20 is arranged near the center of the base light 100 in order to make the light path length until the light emitted from the light emitting element 20 passes through the cover member 3 as long as possible. The polarization plane 24 a is inclined at an angle at which the optical axis O passes through the corner portion 3 b farthest from the light source of the cover member 3. Thereby, in the present embodiment, the above-described dot-like luminance unevenness can be almost eliminated.

  Moreover, according to this embodiment, it is not necessary to arrange | position another member, such as an optical filter for diffusing light, between the light emitting element 20 and the cover member 3 in spite of having used LED for the light source, and light emission. The thickness of the module 30 can also be reduced. For this reason, according to the present embodiment, the manufacturing cost of the base light 100 can be reduced with a simple configuration without increasing the number of parts. Further, according to the present embodiment, the base light 10 can be thinned, and uniform illumination light can be obtained without using LEDs as a light source.

  Furthermore, according to the present embodiment, as shown in FIG. 4, two sets of light emitting modules 30 are arranged on both sides in the width direction of the chassis 1, and the optical axes O of the light emitting elements 20 of the respective light emitting modules 30 are opposite to each other. That is, since the light is inclined in the direction from the center of the base light 100 toward the outside, it is possible to obtain illumination light that spreads in the width direction, and between the base lights 100 when a plurality of base lights 100 are installed side by side in the width direction. The mounting interval can be widened.

  In the first embodiment described above, the mounting position of the light emitting element 20 and the inclination angle of the polarization plane 24a of the lens body 24 are set so that the optical axis O of the light emitting element 20 passes through the corner 3b of the cover member 3. Although set, the mounting position of the light emitting elements 20 and the inclination angle of the polarization plane 24a are not limited to the present embodiment, and illumination emitted through the light exit surface 30a of the front surface portion 3a of the cover member 3 is provided. What is necessary is just to set to the value which can suppress the brightness nonuniformity of light.

  Further, for example, by changing the material and shape of the lens body 24 of each light emitting element 20, the ratio of the light emitted from the polarization surface 24a is changed, or the amount of light emitted from a part other than the polarization surface 24a is controlled. Alternatively, luminance unevenness may be suppressed. Alternatively, instead of providing the lens body 24 for each light emitting element 20, the optical axis O of the light emitting element 20 may be inclined using a reflector or a polarizing member (not shown).

  Further, the optical characteristics of the front surface portion 3a of the cover member 3 may be changed in order to reduce luminance unevenness. In this case, for example, a frost treatment is performed on the light emitting surface 30a so as to gradually change the light transmittance of the front surface portion 3a of the cover member 3 according to the distance from the light emitting element 20 to the front surface portion 3a of the cover member 3. May be applied.

  Next, a second embodiment will be described with reference to FIG. The base light of the present embodiment is the same as that of the first embodiment described above except that the light emitting module 60 has a holding structure in which the substrate 61 on which the LED chip 22 is mounted is held obliquely and has a tube-shaped cover member 63. It has almost the same structure. Therefore, here, the same reference numerals are given to components that function in the same manner as in the first embodiment, and detailed description thereof will be omitted. In particular, a detailed description of the base light is omitted here.

  As shown in FIG. 6, the light emitting module 60 includes an elongated rectangular belt-like substrate 61 on which a plurality of light emitting elements 62 are mounted, a tube-shaped translucent cover member 63 that surrounds the entire circumference of the substrate 61, and this An elongated reflecting plate 64 is provided on the inner side of the cover member 63 on the side opposite to the front surface portion 63a (back surface side) of the cover member 63. A holding portion 65 for holding the substrate 61 at a predetermined angle on the inner side of the cover member 63 is provided integrally with the reflecting plate 64 at a position offset toward one edge side (right side in the drawing) of the reflecting plate 64 in the width direction. Yes.

  The light emitting element 62 has a cylindrical phosphor layer 23 ′ in which the LED chip 22 is sealed on the surface of the substrate 61. Since the light emitting element 62 does not include the lens body 24 of the first embodiment, the optical axis O coincides with the central axis of the phosphor layer 23 ′ and is orthogonal to the surface of the substrate 61. A plurality of such light emitting elements 62 are arranged in a straight line at equal intervals along the longitudinal center line of the substrate 61.

  The cover member 63 is formed in a flat cylindrical shape by extrusion molding of a resin material having translucency similar to that of the cover member 3 of the first embodiment. The cover member 63 is incorporated into the base light 100 by attaching the back surface 63b opposite to the front surface portion 63a to the arrangement portion 12 of the chassis 1. Note that the outer surface of the front surface portion 63a functions as a light emitting surface 60a for extracting illumination light.

  The reflecting plate 64 has a size that covers the entire inner surface of the cover member 63 on the back surface 63b side, and the other end in the width direction (the left end in the drawing) is slightly curved forward. And the inner surface 64a of the front surface side of this reflecting plate 64 is coated with white, and has a high light reflectance.

  The holding unit 65 includes a back plate 65 a that is inclined with respect to the reflection plate 64 at the same angle as the inclination angle of the desired substrate 61. A pair of holding grooves 65b facing each other for holding the both edges in the width direction of the substrate 61 are provided at both edges in the width direction of the back plate 65a. The substrate 61 is inserted into the pair of holding grooves 65 b from one end in the longitudinal direction of the cover member 63 and is held at a predetermined angle inside the cover member 63.

  In this case, the inclination angle of the surface of the substrate 61 is such that the optical axis O of the plurality of light emitting elements 62 is inclined at an angle larger than 0 degree and smaller than 90 degrees with respect to the normal line of the light emitting surface 60 a of the cover member 63. Is set to When the light emitting module 60 is attached to the base light 100 as in the first embodiment, it is attached so that the optical axis O of the light emitting element 62 is inclined outward from the center of the base light 100.

  As described above, according to the present embodiment, since the substrate 61 itself on which the light emitting element 62 is mounted is held at an angle, the optical axis O of the light emitting element 62 can be easily set in a desired direction. In particular, in the present embodiment, the optical axis O of the light emitting element 62 can be set to a desired angle by adjusting the angle at which one end of the reflector 64 is bent, and there is no need to individually adjust the angle of the light emitting element 62. As a matter of course, this embodiment can achieve the same effects as those of the first embodiment described above, and can reduce the occurrence of dot-like luminance unevenness after making the light emitting module 60 thinner, which is favorable. Illumination light can be obtained.

  Further, according to the present embodiment, the cover member 63 is closed in a tube shape, so that foreign matters such as dust and dirt can be prevented from entering the cover member 63, and a constant brightness can be maintained over a long period of time. The initial luminous efficiency can be maintained for a long time.

  FIG. 7 shows a modification of the above-described second embodiment. The light emitting module 70 according to this modification has substantially the same structure as that of the above-described second embodiment except that the light emitting element 72 has a structure in which the position of the light emitting element 72 is shifted to one side in the width direction (upper left in the drawing). Therefore, the description about the structure which functions similarly to 2nd Embodiment is abbreviate | omitted here.

  That is, in this light emitting module 70, compared to the second embodiment, the light emitting element 72 can be moved away from the light emitting surface 60a, and the dot-like luminance unevenness can be made less likely to occur.

  According to the light emitting module and the illuminating device of at least one embodiment described above, the optical axis O of the light emitting element using the LED is inclined with respect to the light emitting surface of the cover member. In addition, the apparatus can be thinned, and uniform and uniform illumination light can be obtained.

  The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. The above-described embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The above-described embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and spirit of the invention.

  For example, in the second embodiment described above, the reflection plate 64 is provided inside the cover member 63, but this reflection plate 64 is omitted, and light reflectivity is imparted to a portion on the back surface 63b side of the cover member 63. You may do it. In this case, for example, the cover member 63 is made of resin so that the front surface portion 63a on the light emitting surface 60a side of the cover member 63 has translucency and the back surface 63b on the opposite side to the light emitting surface 60a has reflectivity. A two-color molding method can be considered.

  Thus, if the reflector 64 is omitted, the number of parts can be reduced correspondingly, and the light emitting module can be made lighter and thinner. Further, by omitting the reflecting plate 64, light lost in the light emitting module can be reduced, and an energy saving effect can be expected.

  DESCRIPTION OF SYMBOLS 1 ... Chassis, 2 ... Light source part, 3 ... Cover member, 3a ... Front part, 20 ... Light emitting element, 21 ... Board | substrate, 22 ... LED chip, 23 ... Phosphor layer, 24 ... Lens body, 24a ... Polarizing surface, 30 ... light emitting module, 30a ... light emitting surface, 100 ... base light, C ... ceiling.

Claims (3)

A light emitting element;
A light transmissive member having a light exit surface that transmits light emitted from the light emitting element and extracts illumination light; and
The light emitting element is directed toward the light transmissive member, and an optical axis thereof is provided to be inclined at an angle greater than 10 degrees and smaller than 80 degrees with respect to the normal line of the light emitting surface.
Light emitting module.   The light-emitting module according to claim 1, wherein the translucent member has optical characteristics that are gradually changed according to the distance from the light-emitting element so that the illuminance distribution of the illumination light that has passed through the light exit surface is uniform. Two light emitting modules according to claim 1 or 2 are arranged side by side so that the optical axes of the light emitting elements are inclined in directions away from each other,
The lighting device in which the light emitting surfaces of the two light emitting modules are arranged in parallel with the ceiling surface.

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