JP6851116B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device using a semiconductor light emitting element as a light source.

In a conventional lighting device, a substrate on which a light emitting element is mounted is covered with a translucent cover member in order to protect a charging unit and a semiconductor light emitting element (hereinafter, referred to as a light emitting element). Some of the cover members have a shape in which a plurality of light emitting elements arranged side by side are covered in a groove shape along the parallel arrangement direction.

For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-278266), in a light emitting element mounted side by side on a substrate and a cover member including the substrate and the plurality of light emitting elements, the light emitting elements are arranged along the parallel arrangement direction. A shape having a groove formed in an integral manner has been proposed. This is mainly configured to reduce warpage and deformation of the substrate.

Japanese Unexamined Patent Publication No. 2010-278266

In Patent Document 1, in the shape of covering the light emitting elements in which a plurality of translucent cover members are arranged side by side on the substrate in a groove shape along the parallel arrangement direction, the light flux emitted from the light emitting elements is directed in the longitudinal direction of the groove. There was a concern that the efficiency of extracting the luminous flux would deteriorate due to the total reflection of a part of the luminous flux to be directed.

An object of the present invention is to provide a lighting device having high extraction efficiency of a light flux emitted from a light emitting element.

In order to achieve the above object, a feature of the present invention is a translucency that uses a plurality of semiconductor light emitting elements as light sources and integrally covers the substrate, the plurality of semiconductor light emitting elements mounted on the surface of the substrate, and a power supply connector. Covers the translucent cover member having a cover member, a shade attachment, and being engaged and held by the shade attachment in a state of being fixed to the ceiling surface and the heat radiating plate to which the substrate is attached. The shape of the portion of the translucent cover member that has a shade and covers the semiconductor light emitting element has a semicircular cross section centered on the semiconductor light emitting element, and is adjacent to the translucent cover member. The space between the semicircular shapes is a flat shape.

Alternatively, a feature of the present invention is to have a translucent cover member that uses a plurality of semiconductor light emitting elements as a light source and integrally covers the substrate and the plurality of light emitting elements mounted on the surface of the substrate. The present invention is to make the shape of the portion of the plurality of semiconductor light emitting elements covering each light emitting element into a hemispherical shape centered on each light emitting element.

Alternatively, a feature of the present invention is to have a translucent cover member that uses a plurality of semiconductor light emitting elements as a light source and integrally covers the substrate and the plurality of light emitting elements mounted on the surface of the substrate. The shape of the portion that covers some of the light emitting elements as a set is a hemispherical shape centered on the center of the light emitting part of the plurality of light emitting elements.

Preferably, the present invention is configured such that the wall thickness of the hemispherical portion of the translucent cover member changes smoothly so as to be thin in the vicinity of the apex of the hemispherical portion and thick in the vicinity of the equatorial region. I have done it.

Preferably, in the present invention, when two or more adjacent hemispherical shapes in the translucent cover member collide with each other and interfere with each other, the outer edge of the interfering portion is outside the radiation angle of the light emitting element at the substantially center of the hemispherical shape. The structure is located at.

Preferably, the present invention has a structure in which the overall shape of the translucent cover member including the individual hemispherical shapes covering the light emitting element is point-symmetrical with respect to the center point of the translucent cover member.

Preferably, the present invention has a structure in which a part of the translucent cover is a light receiving portion of a remote control signal.

According to the present invention, by covering the light emitting element with a hemispherical translucent cover member centered on each light emitting element, the light flux emitted from the light emitting element is directed to the surface of the translucent cover member. Since the light is incident in the substantially normal direction and the total reflection of the light flux passing through the translucent cover member can be avoided when it goes out, it is possible to realize a lighting device having improved light flux extraction efficiency. Can be done.

Further, according to the present invention, by forming a plurality of hemispherical shapes, the rigidity of the translucent cover member is improved, so that warpage and deformation of the substrate are reduced, and the light emitting element is attached to the translucent cover member. In addition to correcting the position to an appropriate position, the adhesion of the light emitting element mounting substrate to the heat radiating plate is improved, and a lighting device having high luminous efficiency of the light emitting element can be realized.

Further, according to the present invention, the overall shape of the translucent cover member is point-symmetrical with respect to the center point of the translucent cover member, so that a cover with less distortion during molding and good productivity is realized. can do.

Further, according to the present invention, the wall thickness of the hemispherical portion is configured to be thin in the vicinity of the zenith portion of the hemispherical portion and to be thick in the vicinity of the equatorial region so as to be smoothly changed. It is possible to realize a lighting device having a wide light angle.

It is an external view of the lighting apparatus which concerns on embodiment of this invention. It is the figure of the state which removed the shade of the lighting device which concerns on the same above. It is the figure of the state which removed the translucent cover of the lighting device which concerns on the same above. It is an enlarged view of the light emitting element mounting substrate shown in FIG. It is a figure of the state in which the light emitting element mounting substrate of the lighting apparatus which concerns on embodiment of this invention is removed. It is the figure of the state which removed the heat radiating plate of the lighting device which concerns on the same above. It is an exploded perspective view of the lighting device which concerns on the same above. It is an enlarged view of the translucent cover shown in FIG. 7. It is a partial cross-sectional view of the lighting apparatus which concerns on embodiment of this invention. It is a partial cross-sectional view of the lighting device which concerns on the same above. It is a partial cross-sectional view of the lighting device which concerns on the same above. It is an enlarged view of the hemispherical shape part of the lighting apparatus which concerns on the same above. It is an enlarged view of the hemispherical shape part of the lighting apparatus which concerns on the same above. It is an enlarged view of the hemispherical shape part of the lighting apparatus which concerns on the same above. It is an enlarged view of the hemispherical shape part of the lighting apparatus which concerns on the same above. This is another embodiment of the lighting device according to the same as above. It is sectional drawing of the hemispherical part of the lighting apparatus which concerns on the same above. It is sectional drawing of the hemispherical part of the lighting apparatus which concerns on the same above. It is a partially enlarged view of the state in which the heat radiating plate of the lighting device which concerns on the same is removed. It is a figure explaining the method of positioning with the light emitting element mounting substrate of the illuminating device which concerns on the same | mounted on the heat radiating plate. It is sectional drawing of the substantially hemispherical part of the lighting apparatus which concerns on the same above. It is sectional drawing of the remote control light receiving part of the lighting apparatus which concerns on the same above.

Hereinafter, the configuration of the lighting device according to the embodiment of the present invention will be described with reference to the attached figures. This lighting device is installed on the ceiling surface of a building, mainly a living room of a general household, and is connected to an external power source via a mounting adapter that engages with indoor wiring equipment such as a hook rosette or a hook ceiling attached to the building. It is also used by being fixed in a predetermined position. FIG. 1 is an external view of the lighting device installed on a ceiling surface (not shown) as viewed from below. The shade 2 is a transparent, translucent, or milky white translucent component made of a resin material such as acrylic or polystyrene. This mainly diffuses the luminous flux radiated from the light source to reduce the glare when the user directly looks at the luminaire, and to equalize the brightness in the room where the luminaire is installed. have.

Next, FIG. 7 shows an exploded perspective view of the lighting device 1, and FIGS. 2 to 6 according to the decomposition level will be used to explain the structure. FIG. 2 shows a state in which the shade 2 is removed. The shade 2 is engaged and held by a shade attachment 5 fixed to the heat radiating plate 3. For example, by rotating the shade 2 counterclockwise in the circumferential direction, an engaging portion (not shown) projecting on the shade 2 is formed. It is designed to come off. When the shade 2 is removed, the fixture mounting portion 14 provided in the center of the main body base 9 formed of, for example, a metal plate, which will be described later, can be seen, and the claw-shaped hook portion of the mounting adapter described above is visible in this portion. By engaging, for example, it is fixed at a predetermined position on the ceiling surface of the living room. Further, a power feeding connector 41 connected to the lighting circuit board 11 described later is arranged in the vicinity of the appliance mounting portion 14, and the power feeding connector 41 and the connector arranged on the mounting adapter described above are fitted. By connecting them together, power can be supplied from the indoor wiring of the building.

The translucent cover 4 is a component molded of a transparent resin material such as polycarbonate, acrylic, or polystyrene, and is a light emitting element 8, a light emitting element mounting substrate 6, a connector 7, and a power connector a16 shown in FIGS. 3 and 4. , The power connector b17 and the remote control light receiving hole 13 are integrally covered, and are fixed by screws. In this embodiment, the light emitting element mounting substrate 6 is divided into four pieces, and the light emitting element mounting boards 6 are electrically connected to each other by the connector 7, but for example, the lighting device is operated and emits light. The substrate shape is determined by considering the arrangement of the light emitting elements 8 which are set in consideration of the shape of the light emitting surface which can be seen through the shade 2 when the light emitting element is mounted, and the productivity such as the number of light emitting element mounting substrates 6 taken from the original plate. And the number of sheets used can be arbitrarily set, and is not limited to this embodiment.

The light emitting element 8 is soldered to the light emitting element mounting substrate 6. The light emitting element 8 emits light and generates heat during operation, and the temperature of the light emitting element 8 itself rises. However, since the luminous efficiency decreases as the temperature rises, it is necessary to provide an appropriate heat radiating means corresponding to the temperature rise. .. Therefore, as the light emitting element mounting substrate 6, a copper foil pattern and a solder resist formed on an aluminum plate having an insulating layer or a resin plate having high thermal conductivity are used, and terminals (not shown) of the light emitting element 8 and light emitting are used. The heat generated by the light emitting element 8 is transferred and dissipated to the light emitting element mounting substrate 6 by heat conduction through a heat radiation pad (not shown) provided on the back surface of the element 8 so as to be in close contact with the light emitting element mounting substrate 6. It has become. Further, when it is difficult to obtain a sufficient heat dissipation effect only by the heat dissipation area and heat capacity determined by the dimensions of the light emitting element mounting substrate 6, the light emitting element mounting substrate 6 is brought into close contact with the heat radiating plate 3 formed of, for example, a metal plate. It is necessary to secure heat dissipation by fixing. In this embodiment, it is desirable that the heat radiating plate 3 has as large an area as possible and is integrally made from the viewpoint of thermal conductivity. Therefore, as shown in FIG. 5, the above-mentioned shade attachment 5 and shade 2 are used. It is a large metal part integrally molded by a press, including an attachment portion 38 of a decorative frame (not shown) arranged so as to surround the outer periphery. Further, as shown in FIGS. 5 to 7, the heat radiating plate 3 covers the lighting circuit board 11 screwed and fixed to the main body base 9 together with the insulating plate 10, and the lighting circuit circuit board 11 covers the main body base 9 and the heat radiating plate. It is stored in the space surrounded by 3. Therefore, the light emitting element mounting substrate 6 mounted on the heat radiating plate 3 can expand the area to the vicinity of the central portion of the lighting device 1 to arrange the light emitting element 8, and the brightness of the central portion of the light emitting surface of the lighting device 1 can be arranged. Can be made uniform.

Further, since the lighting circuit board 11 generates heat during operation, the atmospheric temperature of the space surrounded by the main body base 9 and the heat radiating plate 3 rises. At this time, if the volume of the space is small, the heat radiating effect from the light emitting element mounting substrate 6 attached to the heat radiating plate 3 is reduced, so that the heat radiating plate 3 is more than the screwed fixing portion 39 with the main body base 9. The volume of the storage space of the lighting circuit board 11 is secured by forming a convex shape in the direction away from the main body base 9, that is, downward when the lighting device is mounted on the ceiling surface. Further, since the heat radiating plate 3 is manufactured by press-molding a metal plate, the convex shape has a mounting surface of the light emitting element mounting substrate 6, a screw fixing portion 39, a shade mounting tool 5, and a decorative frame mounting portion 38. The surface including the surface is connected by a tapered surface 40. By providing the tapered surface 40, the volume of the storage space of the lighting circuit board 11 and the area of the heat radiating plate 3 can be increased, so that the luminous efficiency of the light emitting element 8 is high and the drawability of the heat radiating plate 3 is good. It is possible to realize a highly productive lighting device.

The light emitting element mounting substrate 6 is fixed to the heat radiating plate 3 together with the translucent cover 4 with a plurality of screws, and each light emitting element mounting substrate 6 is fixed to the heat radiating plate 3 by at least one screw before mounting the translucent cover 4. It is screwed directly to 3. This screwing operation will be described with reference to FIGS. 19 (a) to 19 (d) and FIGS. 20 which are partially enlarged views of the X portion of FIGS. 4, 5, and 5. First, the light emitting element mounting substrate 6 is placed so as to be aligned with the substrate guide protrusion 27 provided on the heat radiation plate 3, and the guide protrusion 27 is a straight portion in which the light emitting element mounting substrates 6 are adjacent to each other, that is, a fan-shaped radius. The cross section is formed by extruding or cutting up 32 having a trapezoidal shape 30 or a semicircular shape 31 so as to meet the gap of the straight line portion 35 corresponding to the direction. The height h of the extruded or cut-out shape is set to be smaller than the thickness of the light emitting element mounting substrate 6 so as not to interfere with the translucent cover 4 to be attached later. This is not the case if a relief shape is provided in. By these processing methods, a linear edge 33 of a sheared portion can be formed in the case of extrusion, and a straight portion 34 of a flat surface cut out can be formed in the case of cutting up. Therefore, as illustrated in FIG. 19D, a light emitting element mounting substrate on the R portion as shown in the a portion is compared with the case where the positioning portion 36 is formed by drawing processing which requires an R shape in manufacturing. There is no ride on No. 6, and more accurate positioning is possible. Further, since the guide protrusions 27 are arranged so as to meet the gaps between the light emitting element mounting substrates 6 in a straight line portion adjacent to each other, that is, the straight line portion 35 corresponding to the radial direction of the fan shape, the guide protrusions 27 are placed on the heat radiating plate 3. By moving the placed light emitting element mounting substrate 6 toward the center of the heat radiating plate 3, the positioning work is completed, and the subsequent screwing work can be smoothly performed. Further, after the work of directly screwing each light emitting element mounting board 6 to the heat radiating plate 3 with at least one screw, the connector 7 connecting the light emitting element mounting boards 6 to each other, the power connector a16, and the power connector After connecting b17, the translucent cover 4 is screwed and fixed, but since there is no misalignment of the light emitting element mounting substrate 6 due to the rigidity of the wiring materials of the plurality of connectors, the translucent cover 4 is used. The screwing work can be performed smoothly, and the productivity can be improved.

In this embodiment, the light emitting element mounting board 6 includes one having a power connector a16 and a power connector b17 connected to the lighting circuit board 11, and three without the two power connectors. The power connector a16 is used to supply power to the light emitting element 8 that normally operates during lighting, and the power connector b17 is used to supply power to the light emitting element 43 that operates only as a security light, but the configuration is limited to these. It's not something. Wiring (not shown) is connected to the lighting circuit board 11 from the two power connectors through a wiring hole 15 provided in the heat radiating plate 3. FIG. 6 is a perspective view showing an installed state of the lighting circuit board 11 with the heat radiating plate 3 removed. The lighting circuit board 11 is placed on an insulating plate 10 formed of a resin material such as polypropylene having flame retardancy, and is screwed and fixed to a main body base 9 formed of a metal plate or the like, and is also insulated. The outer edge is held by the substrate locking portion a28 and the substrate locking portion b42 projecting from the outer edge of the plate 10. A remote control light receiving element 45 covered with a remote control light receiving element cover 12 is arranged on the lighting circuit board 11, and receives an infrared signal from a remote control unit (not shown) operated by the user and responds to the signal. It is designed to control lighting. Further, the tubular tip opening 29 of the remote control light receiving element cover 12 faces the remote control light receiving hole 13 provided in the heat radiating plate 3, and the infrared remote control signal that has passed through the shade 2 and the translucent cover 4. Reach the remote control light receiving element. Further, as shown in FIGS. 3 and 4, the remote control light receiving hole 13 is sandwiched between the C surface portions 44 of the outer shape of the adjacent light emitting element mounting board 6 when the light emitting element mounting board 6 is placed on the heat radiating plate 3. It is placed in the part that has been removed.

Regarding the arrangement of the remote control light receiving hole 13, for example, a hole may be formed at an arbitrary position on the light emitting element mounting substrate 6, but since the arrangement of the light emitting element 8 on the substrate is restricted, light emission is performed as in this embodiment. It is desirable to provide it outside the element mounting substrate 6. Further, even outside the light emitting element mounting substrate 6, for example, it is possible to provide a light receiving hole on the tapered surface 40 of the heat radiating plate 3, but in that case, a cover member for covering the light receiving hole is separately required. It becomes. The remote light receiving hole 13 is opened from the upper surface of the light emitting element 8, that is, the light emitting surface, to a surface lowered by the sum of the height of the light emitting element 8 and the thickness of the light emitting element mounting substrate 6, and the radiation angle of the light emitting element 8 is increased. Since it is located on the outside, it is not easily affected by the light flux from the light emitting element 8, and the reception performance of the remote control signal can be improved.

Next, FIG. 8 shows an external view of the translucent cover 4. A hemispherical shape portion 18, a power connector cover portion 19, a connector cover portion 20, and a remote control light receiving portion 21 are formed in this component. In this embodiment, the remote control light receiving unit 21 is formed with a tubular protrusion that fits into the remote control light receiving hole 13 formed in the heat radiating plate 3, and positions the translucent cover 4 during screwing work. Although it also serves as this shape, it is not limited to this shape, and may be, for example, a simple flat surface. Further, the shape of the remote control light receiving unit 21 can be focused as a hemispherical shape, or the surface of the portion can be textured, for example, to suppress signal reflection on the surface and further improve reception performance. Is also possible.

Further, in the present embodiment, the entire plane shape of the translucent cover 4 is circular, and the entire component is configured to be point-symmetrical with respect to the center point 22, but the same applies to regular and even-numbered squares. It can be configured. In this embodiment, since the four translucent covers 4 can be mounted without worrying about the mounting directions during the mounting work, the working time can be shortened and defective factors such as incorrect mounting directions of parts can be eliminated. In addition, the point-symmetrical shape can reduce distortion during molding and improve productivity.

The hemispherical shape portion 18 covers one or a plurality of light emitting elements 8 as a set. FIG. 10 shows a cross-sectional view when there is one light emitting element 8, and FIG. 13 shows an enlarged view of the hemispherical shape portion 18 in that case. The figure is shown. In this embodiment, the central axis 24 of the hemispherical portion 18 is arranged so as to coincide with the center 23b of the light emitting portion. The center 23b of the light emitting portion in this case coincides with the center of the light emitting element 8.
Since the refractive index of the translucent cover 4 has a constant refractive index that is larger than the refractive index of air (about 1.00), the light beam emitted from the light emitting element 8 is relative to the normal of the hemispherical portion 18. When incident at an angle θi, the angle θo when the light beam is emitted from the hemispherical portion 18 has a critical angle θc, and this critical angle θc differs depending on the material of the translucent cover 4. For example, although it is a typical value, since polycarbonate has a refractive index of about 1.59 and acrylic has a refractive index of about 1.49, the critical angle θc is about 39 ° to 42 °. The luminous flux emitted from the light emitting element 8 located at the substantially center of the hemispherical shape portion 18 is incident on the hemispherical shape portion 18 from the substantially normal direction, and θo is a value sufficiently smaller than the critical angle θc. Therefore, it is possible to avoid a decrease in the extraction efficiency of the light flux due to total reflection at the outer interface between the translucent cover 4 and the air.

Next, FIG. 9 shows a cross-sectional view when there are two light emitting elements 8, and FIG. 12 shows an enlarged view of the hemispherical portion 18 in that case. The central axis 24 of the hemispherical portion 18 is arranged so as to coincide with the center 23a of the light emitting portion. The center 23a of the light emitting portion in this embodiment is a bisector of a straight line connecting the center points of the two light emitting elements 8. When two or more light emitting elements 8 are covered with a hemispherical shape 18 as a set, it is desirable that the distance between the centers of each light emitting element 8 is sufficiently small with respect to the diameter of the hemispherical shape portion 18. There are dimensional restrictions when the hemispherical shape portion 18 is increased, and restrictions such as a decrease in heat dissipation when the distance between the centers of the set of light emitting elements 8 is decreased. However, between the centers of the two light emitting elements 8 so that θo, which changes with the incident angle θi of the light flux emitted from each light emitting element 8 covered by the hemispherical portion 18, does not exceed the critical angle θc. By appropriately setting the distance and the diameter of the hemispherical shape portion 18, the same effect as in the case of one light emitting element 8 can be obtained.

Further, FIG. 14 shows a case where the three light emitting elements 8 are arranged in a straight line. Of the three light emitting elements 8 arranged at equal intervals, the center 23c of the light emitting portion in this embodiment coincides with the center of the light emitting element 8 located at the center. It is the same as the case of making one set. Further, FIG. 15 shows a case where the three light emitting elements 8 are arranged so as to be the vertices of an equilateral triangle. The center 23d of the light emitting portion in this case is the center of gravity of the equilateral triangle. According to this embodiment, the diameter of the hemispherical portion 18 can be made smaller than that in the case where the light emitting elements 8 are arranged in a straight line.

As described above, the case where 1 to 3 light emitting elements 8 are arranged in one hemispherical shape portion 18 has been illustrated, but the same applies to the case where the number is further increased. That is, a plurality of light emitting elements 8 are arranged at the apex of the regular polygon and inside the apex, and the center of gravity of the polygon is configured to coincide with the central axis 24 of the hemispherical shape portion 18, and the hemispherical shape 18 is formed. The centers of the plurality of light emitting elements 8 so that the θo that changes with the incident angle θi of the light emitted from each of the covered light emitting elements 8 does not exceed the critical angle θc that differs depending on the material of the translucent cover 4. The same effect can be obtained by appropriately setting the distance and the diameter of the hemispherical portion 18.

Further, FIG. 16 illustrates a case where the portion 18a covering the plurality of light emitting elements 8 has a semi-cylindrical shape having a 1/4 spherical shape at both ends. In this embodiment, a plurality of light emitting elements 8 arranged at equal intervals on a straight line are covered as a set, but as in the case of the hemispherical shape, the center 23c of the light emitting portion and the portion 18a covering the light emitting element 8 are covered. The axes of symmetry 25 of the above are configured to coincide with each other. However, as the cylindrical portion 37 becomes longer, the angle θi incident on the cylindrical portion 37 of the light beam emitted from the light emitting elements 8 arranged at both ends away from the center 23c of the light emitting portion increases. Therefore, θo is totally reflected beyond the critical angle θc, and the efficiency of extracting the luminous flux is lowered. Therefore, in this embodiment, the distance between the centers of the plurality of light emitting elements 8 is shortened and the diameters of the 1/4 spherical portions at both ends are increased so that the semi-cylindrical shaped portion 37 is as short as possible. Etc. need to be set.

Further, when the plurality of light emitting elements 8 are grouped together and covered with a hemispherical shape portion 18 or a semi-cylindrical shape portion 18a having a 1/4 spherical shape at both ends, it is also possible to configure the light emitting elements 8 having different emission colors. Is.

Next, FIG. 17 shows a cross-sectional view when a plurality of adjacent hemispherical portions 18 interfere with each other. The luminous flux emitted from the light emitting element 8 at the radiation angle α according to the characteristics of the light emitting element 8 is incident on the hemispherical portion 18. When adjacent hemispherical portions 18 interfere with each other as in this embodiment, the outer edge 26 of the portion where the hemispherical portions interfere with each other is the central axis 24 of each hemispherical portion 18 and the center 23a of the light emitting portion. It is desirable that the light emitting elements 8 are located outside the radiation angle α of each light emitting element 8 arranged so as to substantially coincide with the above. FIG. 18 illustrates a case where the outer edge 26 of the portion where the adjacent hemispherical portions interfere with each other is located inside the radiation angle α of each light emitting element 8. In this case, the luminous flux radiated from the light emitting element 8 passes through the interference-shaped portion between the hemispherical-shaped portions 18 and is incident on the adjacent hemispherical-shaped portions 18 at a large angle, so that θo exceeds the critical angle θc. It is conceivable that the efficiency of extracting the luminous flux will decrease due to total reflection.

FIG. 21B shows another embodiment of the cross section of the hemispherical portion 18. In this embodiment, by shifting the center of the radius of curvature Ri inside the hemispherical portion 18 and the center of the radius of curvature Ro outside, the wall thickness tE near the equator is larger than the wall thickness tV near the apex of the hemisphere. Is a large example. Compared with the case of FIG. 21A having a uniform wall thickness, the incident angle θo of the light beam emitted from the light emitting element 8 to the outer interface of the hemispherical portion 18 is large, so that the light flux is spread over a wider range. However, in this case, it is necessary to make θo smaller than the critical angle θc. On the contrary, FIG. 21C shows an example in which the wall thickness tE near the equatorial region is smaller than the wall thickness tV near the apex of the hemispherical shape. Here, the equator portion refers to the vicinity of the cut portion in the hemispherical portion 18. In this case, contrary to the above, θo becomes small and the luminous flux can be collected in a narrower range. Further, FIG. 21D is an example in which the inside is a hemisphere and the outside is a cubic curved surface such as a part of a surface made of a paraboloid or an elliptical rotating body. In this case as well, the center of the radius of curvature Ri inside the hemispherical portion 18 is described above in that light collection and diffusion can be controlled by the relationship between the wall thickness tV near the apex and the wall thickness tE near the equator. It is the same as shifting the center of the outer radius of curvature Ro. The same applies when the inside is a quadric surface such as a part of a surface made of a paraboloid or an elliptical rotating body, and the outside is a hemisphere. As described above, it is also possible to change the wall thickness of the hemispherical portion 18 to control the angle of incidence θo of the hemispherical portion 18 on the outer interface to obtain light distribution characteristics according to the purpose of the lighting device. ..

Next, exemplifying the dimensions of the translucent cover 4 in this embodiment, the outer diameter is φ395 mm, the resin wall thickness is 1.5 mm, and the height of the hemispherical portion is 12 mm. Further, as shown in FIG. 8, a total of about 100 power supply connector cover portions 19, connector cover portions 20, hemispherical shape portions 18, and the like are formed over the entire surface of the translucent cover 4. Therefore, the translucent cover 4 has higher rigidity than the case where it has a simple flat shape, and the translucent cover 4 is screwed and fixed to the heat radiating plate 3 from above the light emitting element mounting substrate 6. Therefore, the warp and deformation of the light emitting element mounting substrate 6 can be reduced. Further, since the light emitting element 8 is corrected to an appropriate position with respect to the translucent cover 8 and the adhesion of the light emitting element mounting substrate 6 to the heat radiating plate 3 is improved to improve the heat radiating property, the light emitting surface is uniform. It is possible to realize a lighting device having high luminous efficiency of the light emitting element 8.

As described above, according to the present embodiment, by covering the light emitting element 8 with a hemispherical translucent cover 4 centered on each light emitting element, the light flux emitted from the light emitting element 8 is transmitted. Since the light is incident on the surface of the light cover 4 in a substantially normal direction, total reflection when the light flux goes out through the light transmissive cover 4 can be avoided, so that the efficiency of extracting the light flux is improved. It is possible to realize a lighting device that has been made.

Further, according to the present embodiment, by forming a plurality of hemispherical portions 18, the rigidity of the translucent cover 4 is improved, so that the warp and deformation of the light emitting element mounting substrate 6 can be reduced. Further, the light emitting element 8 is corrected to an appropriate position with respect to the translucent cover 4, and the light emitting element mounting substrate 6 is more closely adhered to the heat radiating plate 3 to improve the heat radiating property, so that the light emitting surface is uniform. It is possible to realize a lighting device having high luminous efficiency of the light emitting element 8.

Further, according to the present embodiment, the overall shape of the translucent cover 4 is point-symmetrical with respect to the center point of the translucent cover 4, so that a cover with good productivity can be realized.

Further, according to the present embodiment, the wall thickness of the hemispherical portion 18 is configured to be thin in the vicinity of the zenith of the hemispherical portion 18 and to be thick in the vicinity of the equatorial region so as to be smoothly changed. It is possible to realize a lighting device having a wide light distribution angle.

1 Lighting device 2 Sade 3 Heat dissipation plate 4 Translucent cover 5 Sade fixture 6 Light emitting element mounting board 7 Connector 8 Semiconductor light emitting element (light emitting element)
9 Main body base 10 Insulation plate 11 Lighting circuit board 12 Remote control light receiving element cover 13 Remote control light receiving hole 14 Instrument mounting part 15 Wiring hole 16 Power connector a (wiring material not shown)
17 Power connector b (wiring material not shown)
18 Hemispherical shape part 18a Semi-cylindrical shape part having 1/4 sphere shape at both ends 19 Power connector cover part 20 Connector cover part 21 Remote control light receiving part 22 Center points 23a, 23b, 23c, 23d Center of light emitting part 24 Center of hemispherical shape Axis 25 Symmetric axis 26 Outer edge of part where hemispherical shaped parts interfere with each other 27 Board guide protrusion 28 Board locking part a
29 Tip opening 30 Trapezoidal extrusion 31 Semi-circular extrusion 32 Cutting and raising 33 Straight edge of sheared part by pushing out 34 Straight line part of flat surface by cutting and raising 35 Straight line part 36 in the radial direction of the fan shape of the light emitting element mounting substrate 6 Positioning part by processing 37 Cylindrical shape part 38 Decorative frame mounting part 39 Screw fixing part 40 Tapered surface 41 Power supply connector 42 Board locking part b
43 Light emitting element (for security light)
44 C surface 45 Remote control light receiving element

Claims (2)

A translucent cover member that uses a plurality of semiconductor light emitting elements as a light source and integrally covers the substrate, the plurality of semiconductor light emitting elements mounted on the surface of the substrate, and a power connector.
A heat-dissipating plate that has a shade attachment and has the board attached to it,
It has a shade covering the translucent cover member , which is engaged and held by the shade attachment in a state of being fixed to the ceiling surface.
The shape of the portion of the translucent cover member that covers the semiconductor light emitting element is formed so that the cross section is semicircular with the semiconductor light emitting element as a substantially center.
A lighting device characterized in that, in the translucent cover member, the adjacent semicircular shapes have a flat shape. The lighting device according to claim 1, wherein a portion of the translucent cover member that covers a substrate other than a portion on which the semiconductor light emitting element and the power connector are mounted has a flat shape.

Images