JP2018014302A - lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp which is excellent in assemblability while being capable of achieving both of excellent light distribution to surroundings and improvement of heat radiation efficiency of fins.SOLUTION: A lamp 1A comprises a plurality of light source units 3 arranged around a lamp axis line ax. Each of the plurality of light source units 3 comprises: a light source substrate 4 having a light emission surface arranged with a light-emitting device 4a; a base part 5 located at an opposite side to the light emission surface of the light source substrate 4; a cover member 6 being fitted to the base part 5 and covering the light emission surface of the light source substrate 4; and radiation fins 7 protruding from a surface of an opposite side to the light source substrate 4 of the base part 5. At least a part of each cover member 6 diffuses and transmits light. Each light source unit 3 is arranged such that the radiation fins 7, at least partially, face a lamp outer periphery.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lamp.

  A lamp using a light emitting element such as an LED (Light Emitting Diode) as a light source is widely used. Patent Document 1 below discloses a lamp in which a plurality of light source units are arranged around the center axis of the lamp with the back surface of a flat light source unit having a mounting substrate on which a light emitting element is mounted facing inward. This lamp is provided with a heat radiating fin and a space through which air flows on the back side of the light source unit.

Japanese Patent No. 5559824

  In a lamp with a large luminous flux, the temperature of the light emitting element tends to increase. When the temperature of the light-emitting element increases due to heat generation of the light-emitting element, energy consumption efficiency decreases and the life of the light-emitting element is shortened. For this reason, it is desired to improve the heat dissipation property to dissipate heat of the light emitting element so that the temperature of the light emitting element does not increase. For example, a lamp with a high luminous flux is installed in a high-temperature environment such as a ceiling, or is incorporated in a sealed device such as a street light, so that it is difficult to suppress the temperature rise of the light-emitting element. In the lamp of Patent Document 1, since the heat radiating fins are in the inner space surrounded by the plurality of light source units, heat is easily trapped in the space, and the heat dissipation from the heat radiating fins is not good.

  The present invention has been made to solve the above-described problems, and provides a lamp that can achieve both good light distribution to the surroundings and improved heat dissipation efficiency of the fins, and has excellent assemblability. With the goal.

  A lamp according to the present invention includes a plurality of light source units arranged around a lamp axis, and each of the plurality of light source units includes a light source substrate having a light emitting surface on which a light emitting element is arranged, and a light emitting surface of the light source substrate. A base part on the opposite side, a cover member attached to the base part and covering the light emitting surface of the light source substrate, and a heat radiation fin protruding from the surface of the base part opposite to the light source substrate. The unit diffuses and transmits light, and each light source unit is disposed such that the heat radiating fins at least partially face the outer periphery of the lamp.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to make favorable light distribution to the periphery and the improvement of the thermal radiation efficiency of a fin, it becomes possible to provide the lamp | ramp excellent in assemblability.

1 is a perspective view of a lamp according to Embodiment 1. FIG. It is the figure which looked at the lamp | ramp of Embodiment 1 from the direction (lamp front end side) of the lamp | ramp axis line. 2 is a cross-sectional view of the lamp according to Embodiment 1. FIG. 3 is an exploded perspective view of a light source unit provided in the lamp of Embodiment 1. FIG. It is the figure which looked at the light source unit with which the lamp | ramp of Embodiment 1 is provided from the direction of the lamp axis line. FIG. 3 is a light distribution diagram showing ambient light distribution of the lamp according to the first embodiment. 6 is a perspective view of a lamp according to Embodiment 2. FIG. It is the figure which looked at the lamp | ramp of Embodiment 2 from the direction (lamp front end side) of the lamp | ramp axis line. 6 is a cross-sectional perspective view of a lamp according to Embodiment 3. FIG. 6 is a perspective view of a lamp according to Embodiment 3. FIG. 6 is a perspective view of a lamp according to Embodiment 4. FIG. It is a perspective view of the lamp | ramp of Embodiment 5. FIG. It is a perspective view of the lamp | ramp of Embodiment 6. FIG. FIG. 10 is a perspective view of a lamp according to a seventh embodiment. FIG. 10 is a perspective view of a lamp according to an eighth embodiment. It is the figure which looked at the lamp | ramp of Embodiment 9 from the direction (lamp front end side) of the lamp | ramp axis line. It is the figure which looked at the lamp | ramp of Embodiment 10 from the direction (lamp front end side) of the lamp | ramp axis line. It is the figure which looked at the lamp | ramp of Embodiment 11 from the direction (lamp front end side) of the lamp | ramp axis line. It is the figure which looked at the lamp | ramp of Embodiment 12 from the direction (lamp front end side) of the lamp axis line. It is the figure which looked at the lamp | ramp of Embodiment 13 from the direction (lamp front end side) of the lamp | ramp axis line.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, common or corresponding elements are denoted by the same reference numerals, and redundant description is simplified or omitted. The present disclosure may include any combination of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a lamp 1A according to the first embodiment. FIG. 2 is a diagram of the lamp 1A according to the first embodiment viewed from the direction of the lamp axis ax. FIG. 3 is a cross-sectional view of the lamp 1A according to the first embodiment. FIG. 4 is an exploded perspective view of the light source unit 3 provided in the lamp 1A of the first embodiment. FIG. 5 is a view of the light source unit 3 provided in the lamp 1A of the first embodiment when viewed from the direction of the lamp axis ax.

  The application of the lamp 1A of the present embodiment shown in these drawings is not particularly limited. The lamp 1A may be a lamp that can be used as a High Intensity Discharged (HID) type lamp that can be attached to indoor and outdoor lighting fixtures such as street lights, road lights, park lights, and high ceiling lights. The lamp 1A may be a lamp that can be used as an alternative to a conventional HID lamp such as a mercury lamp.

  As shown in FIG. 1, the lamp 1 </ b> A of the present embodiment includes a base 2. The lamp axis ax passes through the center of the base 2. The lamp axis line ax corresponds to the central axis of the lamp 1A. The base 2 may be, for example, a screw-type base such as an E39 base (Φ39 mm) or an E26 base (Φ26 mm). The lamp 1A may be mounted on the lighting fixture by inserting the base 2 into a socket (not shown) provided in the lighting fixture. The lamp 1A may be used in any posture such that the base 2 is upward or diagonally upward, the base 2 is downward or diagonally downward, and the base 2 is lateral. In the following description, the base 2 side of the lamp 1A is referred to as “lamp base end side”, the side opposite to the base 2 is referred to as “lamp front end side”, and the circumferential direction around the lamp axis line ax is referred to as “lamp circumferential direction”. Called.

  The lamp 1A includes a plurality of light source units 3 having the same shape and arranged around the lamp axis ax. In the present embodiment, the lamp 1 </ b> A includes three light source units 3. As shown in FIGS. 4 and 5, each light source unit 3 includes a light source substrate 4, a base portion 5, a cover member 6, and heat radiating fins 7.

  The light source substrate 4 has a light emitting surface on which the light emitting elements 4a are arranged. The light emitting element 4a of the light source substrate 4 may include, for example, a light emitting diode (LED). The light emitting element 4a of the light source substrate 4 is preferably a diffused light source having a light distribution without directivity. For example, a chip-on-board (COB) type LED package, a surface-mounted LED package, a chip- It can be any of the scale package LEDs. The light emitting element 4a of the light source substrate 4 may have a light distribution having directivity, such as a bullet-type LED package or an LED package with a light distribution lens. The light emitting element 4a of the light source substrate 4 is not limited to the one provided with the LED, and may include, for example, an organic electroluminescence (EL) element, a semiconductor laser, or the like.

  The base portion 5 is on the back side of the light source substrate 4. The base portion 5 is on the side opposite to the light emitting surface of the light source substrate 4. The base unit 5 supports the light source substrate 4, the cover member 6, and the heat radiation fins 7. The base portion 5 may have a plate shape. The heat generated in the light emitting element 4 a of the light source substrate 4 is thermally conducted from the back surface of the light source substrate 4 to the base portion 5. As a method for fixing the light source substrate 4 to the base portion 5, any method such as screwing or adhesion may be used. A heat conductive material (not shown) such as a heat conductive grease, a heat conductive sheet, a heat conductive adhesive, or a heat conductive double-sided adhesive tape is sandwiched between the light source substrate 4 and the base portion 5. It may be. Further, the light source substrate 4 and the base portion 5 may be integrated. The base part 5 and the radiation fins 7 are preferably formed of a material having high thermal conductivity, for example, a metal material.

  The cover member 6 is attached to the base portion 5. At least a part of the cover member 6 diffuses and transmits light. The cover member 6 covers the light emitting surface of the light source substrate 4. The cover member 6 forms a columnar internal space 9 on the light emitting surface side of the light source substrate 4. The columnar internal space 9 is a columnar space whose longitudinal direction is parallel to the lamp axis ax. The cover member 6 in the present embodiment has a curved surface along the cylindrical surface. The central angle of an arc obtained by cutting the curved surface along a plane perpendicular to the lamp axis ax is greater than 180 °. As shown in the figure, the central angle may be about 270 ° or may be larger than 270 °. The shape of the columnar internal space 9 is a shape close to a cylinder.

  The method of fixing the cover member 6 to the base portion 5 may be any method such as screwing, fitting, or adhesion. The cover member 6 in the present embodiment has a shape in which the lamp front end side and the lamp base end side are opened. The cover member 6 is not limited to such a configuration, and the cover member 6 may have one or both of a front end surface closed on the lamp front end side and a base end surface closed on the lamp base end side. When the cover member 6 has a front end surface or a base end surface, it is possible to distribute light better from the front end surface or the base end surface of the cover member 6 to the lamp front end side or the lamp base end side.

  The heat radiating fins 7 protrude from the base portion 5. The surface of the base portion 5 from which the heat radiating fins 7 protrude is the surface opposite to the light source substrate 4. In the present embodiment, the shape of the radiating fin 7 is a plate shape. A plurality of parallel radiation fins 7 are provided. The radiating fins 7 in the present embodiment extend in parallel with the lamp axis ax. Not limited to such a configuration, the radiating fins 7 may extend in a direction perpendicular to the lamp axis ax, or the radiating fins 7 may extend in an oblique direction with respect to the lamp axis ax. The shape of the radiating fin 7 is not limited to a plate shape, and may be a pin shape. The heat radiating fins 7 may be integrated with the base portion 5. The heat radiating fins 7 are exposed to the lamp external space. The lamp external space is a space outside the columnar internal space 9.

  Light emitted from the light source substrate 4 is emitted to the columnar internal space 9. The light radiated to the columnar inner space 9 passes through the cover member 6 and is radiated to the lamp outer space. The cover member 6 diffuses and transmits light. The light emitted from the cover member 6 to the lamp outer space is emitted not only in the normal direction of the surface of the cover member 6 but also in all directions from the surface of the cover member 6.

  The light source unit 3 may further include a light source cover (not shown) that covers the light emitting surface side of the light source substrate 4 in the columnar internal space 9. It is desirable that the light source cover is transparent so that light is transmitted through the light. The light source cover may be attached to the base portion 5 so as to cover the entire light source substrate 4. That is, the light source substrate 4 may be stored in a closed space surrounded by the light source cover and the base portion 5. The light source cover may be made of a resin material such as polycarbonate resin, acrylic resin, or polystyrene resin. The surface of the light source cover may be subjected to a hard coat process. The light source cover may be waterproof. The joint between the light source cover and the base portion 5 may be provided with a waterproof sealing material or adhesive (not shown). The sealing material or adhesive may be made of, for example, a soft resin material, a sealing material such as silicone, or a rubber material. By providing the light source cover, the light source substrate 4 can be reliably protected from dirt or water, and deterioration or failure of the light emitting element 4a can be reliably suppressed.

  As shown in FIG. 1, each light source unit 3 is arranged so that the heat radiating fins 7 at least partially face the outer periphery of the lamp. In the present embodiment, each light source unit 3 is arranged so that all the heat radiating fins 7 face the outer periphery of the lamp.

  The heat generated in the light emitting element 4 a of the light source substrate 4 is thermally conducted from the base portion 5 to the radiation fins 7. Heat is dissipated from the surfaces of the base portion 5 and the radiation fins 7 by convection and radiation. In the present embodiment, the following effects can be obtained. Since the surface area can be increased by providing the radiation fins 7, the heat radiation can be promoted. Since the radiating fin 7 faces the outer periphery of the lamp, hot air does not accumulate near the radiating fin 7. The air permeability to the radiating fin 7 can be improved. The heat dissipation efficiency of the heat dissipation fin 7 due to convection and radiation can be increased. The temperature of the light emitting element 4a of the light source substrate 4 can be lowered. The light emission efficiency of the light emitting element 4a of the light source substrate 4 can be increased. The lifetime of the light emitting element 4a of the light source substrate 4 can be extended. Even when the number of the light emitting elements 4a mounted on the light source substrate 4 is increased, a sufficient heat radiation area can be secured, so that the temperature of the light emitting elements can be lowered to improve the light emission efficiency. Therefore, it is advantageous to cope with the increase in luminous flux of the lamp 1A.

  The light source unit 3 in the present embodiment has a shape whose longitudinal direction is a direction parallel to the lamp axis ax. By increasing the length of the light source unit 3 in the longitudinal direction, the area of the light source substrate 4 can be increased without affecting the light distribution characteristics of the lamp 1A. For this reason, it is advantageous to cope with a large luminous flux of the lamp 1A. Instead of the configuration of the present embodiment, the shape of the light source unit 3 may be a shape whose longitudinal direction is a direction inclined with respect to the lamp axis ax. Even in that case, an effect similar to that of the present embodiment can be obtained. The light source unit 3 may further include other components (not shown) such as a reflector and a lens.

  As shown in FIG. 1, the lamp 1 </ b> A according to the present embodiment includes a support 10 and a base holder 11. Each light source unit 3 is fixed to the support 10. A base holder 11 is connected to the support 10. The base 2 is held by the base holding part 11. As shown in FIG. 2, the support 10 has a plurality of arms 10 a that project radially toward each light source unit 3. The base portion 5 of the light source unit 3 is fixed to the arm portion 10a. The light source unit 3 and the support 10 may be fixed by any method such as screwing, fitting between a concave portion and a convex portion, insertion, sliding, adhesion, and welding.

  FIG. 3 is a cross-sectional view of the lamp 1A cut along a plane including the lamp axis ax. In FIG. 3, only one light source unit 3 of the three light source units 3 included in the lamp 1 </ b> A is illustrated, and the other two light source units 3 are not illustrated. As shown in FIG. 3, the base 2 and the light source substrate 4 are electrically connected via a wiring 12. The electric power applied to the base 2 is fed to the light source substrate 4 through the wiring 12 so that the lamp 1A is turned on. The wiring 12 is housed in a cavity formed inside the base 2, the base holding part 11, and the support body 10. According to the present embodiment, the wiring 12 that feeds power to the light source substrate 4 is accommodated without being exposed to the external space, so that the wiring 12 can be reliably protected from dirt and the like. The light source substrate 4 includes a connector 4 b connected to the wiring 12. At the time of assembling the lamp 1A, the wiring 12 can be electrically connected to the light source substrate 4 by the connector 4b, so that the assemblability can be improved.

  As for the surface characteristics of the base part 5, the radiation fin 7, the support body 10, and the base holding part 11, it is desirable to have light diffusibility and high reflectivity. For example, a highly reflective white coating may be applied to the surfaces of the base unit 5, the heat radiating fins 7, the base holding unit 11, and the support 10. According to these configurations, the diffusion of light around the lamp 1A can be improved, and a wide light distribution can be achieved.

  The support 10 is preferably made of a material having high thermal conductivity, for example, a metal material. By conducting heat from the base portion 5 to the support 10, heat can be radiated from the surface of the support 10, and heat dissipation is further improved. At least a part of the base holding part 11 may be made of an insulating resin material.

  In the present embodiment, when the lamp 1A is turned on, the light in the columnar inner space 9 of each light source unit 3 passes through the cover member 6, so that the light diffused in all directions is radiated to the lamp external space. . Thereby, the following effects are acquired. Irradiation unevenness in the lamp circumferential direction is small, and light distribution near the entire circumference or light distribution close to the all-around light distribution can be obtained. That is, the luminous intensity from the lamp axis ax can be made almost uniform regardless of the direction. Uneven brightness can be reduced. On the surface of the cover member 6, the image or outline of the light source of the light source substrate 4 becomes inconspicuous.

  FIG. 6 is a light distribution diagram showing the surrounding light distribution of the lamp 1A of the first embodiment. A surrounding light distribution shape 50 shown in FIG. 6 is a surrounding light distribution shape at a position far from the lamp axis ax of the lamp 1A of the first embodiment. Thus, the surrounding light distribution shape 50 of the lamp 1A of the present embodiment is substantially circular and is a very good shape. That is, the illuminance distribution of the lamp 1A at a distance far from the lamp axis ax is substantially constant along the lamp circumferential direction. The peripheral light distribution shape 60 of the comparative example is a peripheral light distribution shape when it is assumed that there is no cover member 6 of the lamp 1A. When it is assumed that there is no cover member 6, light is emitted from each light source unit 3 in the normal direction of the light source substrate 4, and a part of the emitted light is blocked by the other light source units 3. For this reason, the ambient light distribution shape 60 of the comparative example has a shape in which the light emitted from each light source unit 3 is radiated to the periphery of the lamp through the other two light source units 3, and the favorable ambient light distribution It does not become a shape.

  The cover member 6 is preferably made of a milky white resin material in which particles serving as a diffusing agent are dispersed in a base material. The cover member 6 desirably has a high haze and a high total light transmittance. The base material of the cover member 6 may be, for example, a polycarbonate resin having excellent strength resistance, heat resistance, and water resistance. In the case where the base material of the cover member 6 is a polycarbonate resin, the light resistance (discoloration resistance) may be further improved by performing a hard coat treatment with an acrylic resin on the front surface and the back surface of the cover member 6. The base material of the cover member 6 may be another resin, such as an acrylic resin or a polystyrene resin. The diffusing agent for the cover member 6 may be, for example, silicone fine particles, acrylic fine particles, polystyrene fine particles, or the like. When the cover member 6 is made of the resin material as described above, the above-described effect of the cover member 6 can be more reliably exhibited.

  The cover member 6 may be formed by forming fine irregularities such as dimple processing or embossing on the surface of the transparent substrate, instead of the above configuration. In that case, when the lamp 1A is turned on, the image or outline of each light source of the light source substrate 4 may be conspicuous on the surface of the cover member 6.

  As shown in FIG. 2, the three light source units 3 included in the lamp 1A are arranged at an equal distance from the lamp axis ax and at an equal angular interval around the lamp axis ax (120 ° interval in the first embodiment). Has been. Each light source unit 3 is in a position obtained by rotating the other light source units 3 around the lamp axis ax. Each light source unit 3 is located at a position obtained by rotating the adjacent light source unit 3 by 120 ° about the lamp axis ax.

  If it is this Embodiment, light can be radiated | emitted from the surface of each cover member 6 to the circumference | surroundings wide direction because the cover member 6 has a curved surface which follows a cylindrical surface. For this reason, the uniformity of a light distribution shape becomes higher.

  In the present embodiment, the cover member 6 of each light source unit 3 is not in contact with the cover member 6 of the light source unit 3 adjacent to the light source unit 3. There is a space between the cover member 6 of each light source unit 3 and the cover member 6 of the light source unit 3 adjacent to the light source unit 3. In the present embodiment, a part of the light emitted from each light source unit 3 passes through the space between the cover members 6 of the other two light source units 3 and is emitted outside the lamp 1A. It is possible. For this reason, the uniformity of a light distribution shape becomes higher.

  As shown in FIGS. 4 and 5, the light source substrate 4, the base portion 5, the cover member 6, and the heat radiating fins 7 are integrated to form one light source unit 3. In the present embodiment, it is possible to assemble the main part of the lamp 1A by combining a plurality of such light source units 3. For this reason, the lamp 1A is excellent in assemblability and is advantageous in reducing the manufacturing cost. Further, by changing the number of mounted light source units 3, lamps having different luminous flux classes can be easily manufactured. In order to change the number of light source units 3 mounted, for example, the support 10 may be changed to one having a different shape. For example, by preparing the support 10 to which the four light source units 3 can be attached, a lamp having a larger luminous flux than the lamp 1A can be manufactured.

  In the first embodiment, the example in which the number of the light source units 3 included in the lamp 1A is three has been described. The number of light source units 3 provided in the lamp of the present invention is not limited to such a configuration, and may be two, or four or more. It is desirable that the plurality of light source units 3 be arranged at equal distances from the lamp axis ax and at equal angular intervals around the lamp axis ax. When the lamp includes three or more light source units 3, it is particularly advantageous for reducing uneven light distribution and uneven brightness in the lamp circumferential direction.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG. 7 and FIG. 8. The difference from the first embodiment will be mainly described, and the elements common or corresponding to the elements described above are as follows. The same reference numerals are attached, and overlapping descriptions are simplified or omitted. FIG. 7 is a perspective view of the lamp 1B of the second embodiment. FIG. 8 is a view of the lamp 1B of the second embodiment as viewed from the direction of the lamp axis ax (the lamp front end side). The second embodiment is the same as the first embodiment except for the following matters.

  As shown in FIGS. 7 and 8, the cover member 6 of each light source unit 3 provided in the lamp 1 </ b> B of the second embodiment is in contact with the cover member 6 of the light source unit 3 adjacent to the light source unit 3. In the lamp 1B, a central space 13 surrounded by the cover members 6 of the plurality of light source units 3 is formed.

  According to the second embodiment, in addition to the effects similar to those of the first embodiment, the following effects can be obtained. When positioning the cover member 6 at the time of manufacturing the lamp 1B, the cover member 6 can be easily positioned at an appropriate position. Assembling work becomes easy and assemblability improves. In the usage state of the lamp 1B, for example, even when vibration is transmitted from the surroundings, it is possible to reliably suppress the vibration of the cover member 6, and it is possible to reliably suppress deterioration and breakage of the cover member 6.

  Adjacent cover members 6 may be connected to each other by providing a fitting portion or an adhesive portion where the cover member 6 and the cover member 6 are in contact with each other. By doing so, a stronger assembly state can be obtained and the cover member 6 can be more reliably protected against vibration.

Embodiment 3 FIG.
Next, the third embodiment will be described with reference to FIG. 9 and FIG. 10. The difference from the above-described second embodiment will be mainly described, and the elements common or corresponding to the above-described elements include: The same reference numerals are attached, and overlapping descriptions are simplified or omitted. FIG. 9 is a cross-sectional perspective view of the lamp 1C of the third embodiment. FIG. 10 is a perspective view of the lamp 1C of the third embodiment. FIG. 9 is a diagram in which the lamp 1C is cut along a plane perpendicular to the lamp axis ax. FIG. 10 is a view showing a state in which the three cover members 6 included in the lamp 1C are removed.

  As shown in these drawings, the lamp 1 </ b> C of the third embodiment includes a reflector 14 disposed in a central space 13 surrounded by the cover members 6 of the plurality of light source units 3. The reflector 14 includes a reflecting surface 14 a that faces the inner surface of the central space 13. The light emitted from the cover member 6 toward the central space 13 is reflected by the reflecting surface 14 a and returns to the columnar internal space 9. The light that has returned to the columnar internal space 9 passes through the cover member 6 from another position of the cover member 6 and is emitted to the lamp external space.

  In the second embodiment described above, light emitted from the cover member 6 to the central space 13 may be repeatedly reflected in the central space 13, so that light energy may be impaired. In contrast, the third embodiment can prevent such a loss of light energy. In the case of the third embodiment, the same effects as those of the second embodiment can be obtained.

Embodiment 4 FIG.
Next, the fourth embodiment will be described with reference to FIG. 11. The difference from the second embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 11 is a perspective view of a lamp 1D according to the fourth embodiment.

  As shown in FIG. 11, the cover member 6 in the lamp 1D according to the fourth embodiment includes a reflective surface 6a. The reflection surface 6 a is in a region facing the central space 13 surrounded by the cover members 6 of the plurality of light source units 3. The reflective surface 6a may be, for example, a metal film formed by vapor deposition or the like, or may be formed by attaching a reflective film. In the present embodiment, since the light in the columnar internal space 9 is reflected by the reflecting surface 6a, the light in the columnar internal space 9 is suppressed from being emitted to the central space 13. The light reflected by the reflecting surface 6a is transmitted from the other position of the cover member 6 through the cover member 6 and radiated to the lamp external space.

  In the second embodiment described above, light emitted from the cover member 6 to the central space 13 may be repeatedly reflected in the central space 13, so that light energy may be impaired. In contrast, the fourth embodiment can prevent such a loss of light energy. If it is this Embodiment 4, the effect similar to Embodiment 2 will be acquired besides that.

Embodiment 5. FIG.
Next, the fifth embodiment will be described with reference to FIG. 12. The description will focus on the differences from the second embodiment described above, and the same or corresponding elements as those described above have the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 12 is a perspective view of lamp 1E according to the fifth embodiment.

  As shown in FIG. 12, the cover member 6 in the lamp 1E of the fourth embodiment includes a transparent region 6b. The transparent region 6 b is a region facing the central space 13 surrounded by the cover members 6 of the plurality of light source units 3. The transparent area 6b is transparent. The transparent region 6b transmits light normally. According to the present embodiment, the light transmitted from the columnar inner space 9 through the transparent region 6 b and emitted to the central space 13 can easily pass through the transparent region 6 b again and return to the columnar inner space 9.

  In the second embodiment described above, light emitted from the cover member 6 to the central space 13 may be repeatedly reflected in the central space 13, so that light energy may be impaired. On the other hand, if it is this Embodiment 5, the frequency | count of reflection can be reduced and the loss of optical energy can be prevented. In the fifth embodiment, the same effects as in the second embodiment can be obtained.

Embodiment 6 FIG.
Next, the sixth embodiment will be described with reference to FIG. 13. The difference from the first embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 13 is a perspective view of the lamp 1F according to the sixth embodiment.

  As shown in FIG. 13, the outer shape of the cover member 6 in the lamp 1F of the sixth embodiment is a prismatic shape. The shape of the columnar internal space 9 formed by the cover member 6 is a shape close to a pentagonal column. The cover member 6 of each light source unit 3 provided in the lamp 1 </ b> F is in contact with the cover member 6 of the light source unit 3 adjacent to the light source unit 3. The lamp 1 </ b> F includes a surface contact portion 15. The cover members 6 of the adjacent light source units 3 are in surface contact at the surface contact portion 15. In the surface contact portion 15, the side surface of the prism formed by the cover member 6 and the side surface of the prism formed by the cover member 6 adjacent to the cover member 6 are in surface contact.

  In the sixth embodiment, in addition to the effects similar to those of the first embodiment, the following effects can be obtained. When positioning the cover member 6 during the manufacture of the lamp 1F, the cover member 6 can be easily positioned at an appropriate position. Assembling work becomes easy and assemblability improves. In the usage state of the lamp 1F, for example, even when vibration is transmitted from the surroundings, it is possible to reliably suppress the vibration of the cover member 6, and it is possible to reliably suppress deterioration and breakage of the cover member 6. In particular, when the cover members 6 are in surface contact with each other at the surface contact portion 15, the above-described effects can be more reliably achieved.

  Adjacent cover members 6 may be connected to each other by providing a fitting portion or an adhesive portion where the cover member 6 and the cover member 6 are in contact with each other. By doing so, a stronger assembly state can be obtained and the cover member 6 can be more reliably protected against vibration. The surface contact portion 15 of the cover member 6 may be transparent. The surface contact portion 15 of the cover member 6 may transmit light in the regular direction. By doing so, loss when light passes through the surface contact portion 15 can be reduced.

  The lamp 1F of the present embodiment includes a continuous portion 16 where the outer surfaces of the cover members 6 of two adjacent light source units 3 are continuous without a step. If it is this Embodiment, it will become possible to make the joint of the cover members 6 of two adjacent light source units 3 inconspicuous by providing the continuous location 16.

Embodiment 7 FIG.
Next, the seventh embodiment will be described with reference to FIG. 14. The description will focus on the differences from the second embodiment described above, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 14 is a perspective view of a lamp 1G according to the seventh embodiment.

  The lamp 1G according to the seventh embodiment is the same as the lamp 1B according to the second embodiment except that the form of the radiation fins 7 is different. As shown in FIG. 14, the light source unit 3 in the present embodiment includes the radiation fins 7 that are shorter in length and larger in number than those in the second embodiment. These radiating fins 7 are arranged in a staggered manner.

  Assuming a case where the lamp 1B according to the second embodiment described above is used in a posture in which the lamp axis line ax is the vertical direction, the following is obtained. Air warmed by receiving heat from the lower fins 7 rises along the fins 7. In the upper part of the heat radiating fin 7, the temperature boundary layer warmed by such natural convection has a thickness, and there is a possibility that the heat radiation performance is lowered.

  On the other hand, in the case of the seventh embodiment, the following effects can be obtained by arranging the radiating fins 7 in a staggered arrangement. Since the length of each radiation fin 7 is short, the temperature boundary layer on the surface of the radiation fin 7 can be prevented from having a large thickness, and the radiation efficiency of the radiation fin 7 is increased. By disposing the radiating fins 7 so that the thicknesses of the temperature boundary layers between adjacent radiating fins 7 do not overlap, a high heat radiating effect can be obtained.

Embodiment 8 FIG.
Next, the eighth embodiment will be described with reference to FIG. 15. The difference from the above-described second embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 15 is a perspective view of the lamp 1H according to the eighth embodiment.

  The lamp 1H of the eighth embodiment is the same as the lamp 1B of the second embodiment except that the form of the radiation fins 7 is different. As shown in FIG. 15, the shape of the radiation fin 7 in the eighth embodiment is a plate shape extending in an oblique direction with respect to the lamp axis ax.

  According to the eighth embodiment, the following effects can be obtained. Not only when the lamp 1H is used in a posture in which the lamp axis ax is in the vertical direction, but also in a case where the lamp 1H is used in a posture in which the lamp axis ax is in the horizontal direction, it is natural along the surface of the radiation fin 7. It becomes possible to generate convection satisfactorily. For this reason, a high heat dissipation effect is obtained regardless of the direction in which the lamp 1H is installed.

Embodiment 9 FIG.
Next, the ninth embodiment will be described with reference to FIG. 16. The description will focus on the differences from the first embodiment, and the same or corresponding elements as those described above have the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 16 is a view of the lamp 1J according to the ninth embodiment when viewed from the direction of the lamp axis ax (the lamp front end side). In FIG. 16, only the plurality of light source units 3 included in the lamp 1 </ b> J are illustrated, and illustration of other components such as the base 2, the support 10, and the base holding part 11 is omitted.

  As shown in FIG. 16, each of the three light source units 3 included in the lamp 1J is disposed such that the heat radiating fins 7 at least partially face the outer periphery of the lamp. In a plane perpendicular to the lamp axis ax, a half line 70 extending from the center line of each light source unit 3 to the side where the heat radiating fins 7 protrude does not intersect with the other light source units 3 and the other two light source units. Do not pass between 3.

  When three or more light source units 3 are provided, as described above, on a plane perpendicular to the lamp axis line ax, a half line 70 is formed by extending the center line of each light source unit 3 to the side where the radiation fins 7 protrude. By arranging each light source unit 3 so as not to intersect with the other light source units 3 and not to pass between the other two light source units 3, the following effects can be obtained. Since the heat radiating fins 7 of each light source unit 3 at least partially face the outer periphery of the lamp, hot air does not accumulate near the heat radiating fins 7 and air permeability to the heat radiating fins 7 can be improved. That is, an effect similar to that of the first embodiment can be obtained.

Embodiment 10 FIG.
Next, the tenth embodiment will be described with reference to FIG. 17. The description will focus on the differences from the second embodiment described above, and elements that are the same as or correspond to the elements described above have the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 17 is a view of the lamp 1K according to the tenth embodiment as viewed from the direction of the lamp axis ax (the lamp front end side). In FIG. 17, only the plurality of light source units 3 included in the lamp 1 </ b> K are illustrated, and illustration of other components such as the base 2, the support 10, and the base holder 11 is omitted.

  As shown in FIG. 17, the lamp 1 </ b> K includes three light source units 3. In a plane perpendicular to the lamp axis ax, a half line 70 extending from the center line of each light source unit 3 to the side where the heat radiating fins 7 protrude does not intersect with the other light source units 3 and the other two light source units. Do not pass between 3. In a plane perpendicular to the lamp axis ax, the minor angle θ between the half line 70 of each light source unit 3 and the straight line 72 connecting the center 71 of the light source unit 3 and the lamp axis ax is 90 ° or more. It is.

  As described above, in a plane perpendicular to the lamp axis ax, the half line 70 that extends the center line of each light source unit 3 toward the side where the radiation fins 7 protrude, the center 71 of the light source unit 3 and the lamp axis ax If the recess angle θ between the straight line 72 and the straight line 72 is 90 ° or more, the following effects can be obtained. Since the heat radiating fins 7 of each light source unit 3 at least partially face the outer periphery of the lamp, hot air does not accumulate near the heat radiating fins 7 and air permeability to the heat radiating fins 7 can be improved. That is, an effect similar to that of the second embodiment can be obtained.

Embodiment 11 FIG.
Next, the eleventh embodiment will be described with reference to FIG. 18. The difference from the second embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 18 is a diagram of the lamp 1L according to the eleventh embodiment as viewed from the direction of the lamp axis ax (the lamp front end side). In FIG. 18, only the plurality of light source units 3 included in the lamp 1 </ b> L are illustrated, and illustration of other components such as the base 2, the support 10, and the base holder 11 is omitted.

  As illustrated in FIG. 18, the lamp 1 </ b> L includes two light source units 3. The cover member 6 of one light source unit 3 of the lamp 1L is in contact with the cover member 6 of the other light source unit 3. One light source unit 3 of the lamp 1L is at a position obtained by rotating the other light source unit 3 by 180 ° about the lamp axis ax. As described above, when two light source units 3 are provided, the arrangement of one light source unit 3 is such that the other light source unit 3 is rotated 180 ° about the lamp axis line ax. The light distribution shape around the lamp can be improved.

  On a plane perpendicular to the lamp axis ax, a half line 70 extending from the center line of one light source unit 3 of the lamp 1L to the side where the heat radiating fins 7 protrude does not intersect the other light source unit 3 and the other light source A half straight line 70 extending from the center line of the unit 3 to the side from which the heat radiating fins 7 protrude does not intersect one light source unit 3. With such a configuration, the following effects can be obtained. Since the heat radiating fins 7 of each light source unit 3 at least partially face the outer periphery of the lamp, hot air does not accumulate near the heat radiating fins 7 and air permeability to the heat radiating fins 7 can be improved. That is, an effect similar to that of the second embodiment can be obtained.

Embodiment 12 FIG.
Next, the twelfth embodiment will be described with reference to FIG. 19. The difference from the eleventh embodiment will be mainly described, and the same or corresponding elements as those described above are denoted by the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 19 is a view of the lamp 1M according to the twelfth embodiment as viewed from the direction of the lamp axis ax (the lamp front end side). In FIG. 19, only the plurality of light source units 3 included in the lamp 1 </ b> M are illustrated, and illustration of other components such as the base 2, the support 10, and the base holding part 11 is omitted.

  As illustrated in FIG. 19, the lamp 1 </ b> M includes two light source units 3. The cover member 6 of one light source unit 3 of the lamp 1M is not in contact with the cover member 6 of the other light source unit 3. One light source unit 3 of the lamp 1M is at a position obtained by rotating the other light source unit 3 by 180 ° about the lamp axis ax. On a plane perpendicular to the lamp axis ax, a half line 70 extending from the center line of one light source unit 3 of the lamp 1M to the side from which the heat radiating fins 7 protrude does not intersect the other light source unit 3 and the other light source A half straight line 70 extending from the center line of the unit 3 to the side from which the heat radiating fins 7 protrude does not intersect one light source unit 3. According to the twelfth embodiment, an effect similar to that of the eleventh embodiment is obtained.

Embodiment 13 FIG.
Next, the thirteenth embodiment will be described with reference to FIG. 20. The description will focus on the differences from the eleventh embodiment described above, and the same or corresponding elements as those described above have the same reference numerals. Is used to simplify or omit redundant descriptions. FIG. 20 is a view of the lamp 1N according to the thirteenth embodiment when viewed from the direction of the lamp axis ax (the lamp front end side). In FIG. 20, only the plurality of light source units 3 included in the lamp 1 </ b> N are illustrated, and illustration of other components such as the base 2, the support 10, and the base holding part 11 is omitted.

  As shown in FIG. 20, the lamp 1N includes two light source units 3. One light source unit 3 of the lamp 1N is at a position obtained by rotating the other light source unit 3 by 180 ° about the lamp axis ax. On a plane perpendicular to the lamp axis ax, a half line 70 extending from the center line of one light source unit 3 of the lamp 1N to the side where the heat radiating fins 7 protrude does not intersect the other light source unit 3 and the other light source A half straight line 70 extending from the center line of the unit 3 to the side from which the heat radiating fins 7 protrude does not intersect one light source unit 3. In a plane perpendicular to the lamp axis ax, the minor angle θ between the half line 70 of each light source unit 3 and the straight line 72 connecting the center 71 of the light source unit 3 and the lamp axis ax is 90 °. is there. If this minor angle θ is 90 ° or more, the air permeability to the heat radiating fins 7 can be sufficiently improved.

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J, 1K, 1L, 1M, 1N lamp, 2 base, 3 light source unit, 4 light source board, 4a light emitting element, 4b connector, 5 base part, 6 Cover member, 6a reflective surface, 6b transparent area, 7 heat radiation fin, 9 columnar internal space, 10 support, 10a arm portion, 11 base holding portion, 12 wiring, 13 central space, 14 reflector, 14a reflective surface, 15 surface contact Part, 16 continuous points, 50 surrounding light distribution shape, 60 surrounding light distribution shape, 70 half straight line, 71 center, 72 straight line

Claims (17)

Comprising a plurality of light source units arranged around the lamp axis;
Each of the plurality of light source units is
A light source substrate having a light emitting surface on which the light emitting elements are arranged;
A base portion on the opposite side of the light emitting surface of the light source substrate;
A cover member attached to the base portion and covering the light emitting surface of the light source substrate;
A radiation fin projecting from the surface of the base portion opposite to the light source substrate;
With
At least a part of the cover member diffuses and transmits light,
Each of the light source units is a lamp arranged such that the heat radiating fins at least partially face the outer periphery of the lamp.   The lamp according to claim 1, wherein the cover member of each of the light source units is not in contact with the cover member of the adjacent light source unit.   The lamp according to claim 1, wherein the cover member of each light source unit is in contact with the cover member of the adjacent light source unit.   The lamp according to any one of claims 1 to 3, wherein the cover member has a curved surface along a cylindrical surface.   The lamp according to claim 1, wherein the cover member of each light source unit is in surface contact with the cover member of the adjacent light source unit.   The lamp according to any one of claims 1, 3, and 5, wherein an outer shape of the cover member is a prism shape.   The lamp according to any one of claims 1, 3, 5, and 6, wherein an outer surface of the cover member of two adjacent light source units includes a portion that is continuous without a step. A central space surrounded by the cover member of the plurality of light source units is formed,
The lamp according to any one of claims 1 to 7, further comprising a reflector disposed in the central space. A central space surrounded by the cover member of the plurality of light source units is formed,
The said cover member is a lamp | ramp as described in any one of Claims 1-7 provided with the reflective surface in the area | region which faces the said central space. A central space surrounded by the cover member of the plurality of light source units is formed,
The lamp according to any one of claims 1 to 7, wherein the cover member includes a transparent region in a region facing the central space.   The lamp according to any one of claims 1 to 10, further comprising a screw-type base.   The lamp according to any one of claims 1 to 11, wherein at least one of the plurality of light source units has a shape whose longitudinal direction is parallel or inclined with respect to the lamp axis.   The lamp according to any one of claims 1 to 12, wherein the light source substrate includes a connector connected to a wiring.   The lamp according to any one of claims 1 to 13, wherein wiring for supplying power to the light source substrate is accommodated without being exposed to an external space. Comprising three or more light source units,
In a plane perpendicular to the lamp axis, a half line extending from the center line of each light source unit to the side where the heat radiating fins protrude does not intersect with the other light source units, and the other two light source units The lamp according to any one of claims 1 to 14, which does not pass between the lamps. Comprising two light source units,
One of the light source units is at a position obtained by rotating the other light source unit by 180 ° about the lamp axis,
In a plane perpendicular to the lamp axis, a half line extending from the center line of the one light source unit to the side from which the radiation fin protrudes does not intersect the other light source unit, and the other light source The lamp according to any one of claims 1 to 14, wherein a half line extending from a center line of the unit to a side from which the heat radiating fin protrudes does not intersect the one light source unit.   In a plane perpendicular to the lamp axis, an inferiority between a half line extending the center line of each light source unit to the side from which the radiating fin projects and a line connecting the center of the light source unit and the lamp axis. The lamp according to any one of claims 1 to 16, wherein the angle is 90 ° or more.

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