JP2016051582A - lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp excellent in heat radiation performance of a light source part, high in light irradiation efficiency, excellent in energy consumption efficiency, and effective in high luminous flux.SOLUTION: A lamp 1A includes three or more light source units 3 arranged at intervals around a lamp center axis 50. Light emitted from each light source unit 3 to a lamp inside space 60 surrounded by the three or more light source units 3 passes between the other two light source units 3, and then is guided to a lamp outside space. Each light source unit 3 has a slender shape having a direction parallel with or inclined to the lamp center axis 50 as a longitudinal direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lamp.

  For example, a large LED (Light Emitting Diode) lamp excellent in energy saving, long life, and environmental resistance, which is an alternative to a conventional lamp such as a mercury lamp, is demanded. When the LED light source is at a high temperature, the light emission efficiency is lowered and the lifetime is shortened. In order to increase the luminous efficiency of the LED light source and extend the lifetime, it is desirable to increase the heat dissipation from the LED light source and to lower the temperature of the LED light source as much as possible.

  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. However, in this lamp, since the radiating fin is in a space surrounded by a plurality of light source units, heat is easily trapped in the space, and heat dissipation from the radiating fin is not good. In order to improve heat dissipation, it is necessary to increase the size of the heat dissipating fins, which increases the weight.

  Patent Document 2 listed below discloses an LED light bulb device including a light bulb body, an LED portion, and a heat sink portion. The LED included in the LED unit is arranged along the outer surface of the light bulb body with the light emitting surface facing the light bulb body. Light from the LED is led inward into the bulb body, and then led outward from the inside of the bulb body to the outside of the bulb body. The heat sink part is provided on the side opposite to the light emitting surface of the LED.

International Publication No. 2013/069446 Pamphlet Special table 2011-523180 gazette

  In the LED bulb device of Patent Document 2, since the heat sink portion faces the external space of the bulb main body, the heat dissipation from the heat sink portion is improved. However, there are the following problems. Light emitted from the LED enters the bulb body from the outer surface of the bulb body, and exits from the bulb body to the outside of the bulb body. In this way, the light emitted from the LED passes through the wall of the bulb body twice and is irradiated to the outside, so that the light is attenuated, the light irradiation efficiency is low, the energy consumption efficiency is not good, and the luminous flux is increased. It is disadvantageous.

  Moreover, in the LED bulb device of Patent Document 2, a part of the light emitted from the LED is reflected on the outer surface of the bulb body and does not enter the bulb body, so that the light irradiation efficiency is further reduced. The light bulb body usually has a function of diffusing light. When the bulb body has a function of diffusing light, the light emitted from the LED is irregularly reflected on the outer surface of the bulb body, so that the ratio of light entering the bulb body is further reduced, and the light irradiation efficiency is improved. Further decrease.

  The present invention has been made to solve the above-described problems, and provides a lamp that is excellent in heat dissipation of a light source unit, has high light irradiation efficiency, has high energy consumption efficiency, and is advantageous for increasing a luminous flux. With the goal.

  The lamp according to the present invention includes three or more light source units arranged at intervals around the lamp central axis, and emits light from each light source unit to a lamp internal space surrounded by the three or more light source units. Light is guided between the other two light source units and into the lamp external space.

  According to the lamp of the present invention, the light emitted from each light source unit to the lamp internal space is guided between the other two light source units to the lamp external space. It is possible to provide a lamp that is excellent in heat dissipation, has high light irradiation efficiency, has good energy consumption efficiency, and is advantageous for increasing the luminous flux.

It is a perspective view which shows the lamp | ramp of Embodiment 1 of this invention. It is a disassembled perspective view which shows the light source unit with which the lamp | ramp shown in FIG. 1 is provided. It is a perspective view which shows the modification of the lens array cover with which a light source unit is provided. It is the figure (however, the state which removed the front end side support body) which looked at the lamp | ramp of Embodiment 1 of this invention from the front end side of the lamp | ramp center axis | shaft. It is a figure for demonstrating the beam angle of the light source unit in a cross section perpendicular | vertical with respect to a lamp | ramp central axis. It is a perspective view which shows the lamp | ramp of Embodiment 2 of this invention. It is the figure which looked at the lamp | ramp shown in FIG. 3 from the front end side of the lamp | ramp central axis (however, the state which removed the front end side support body). It is a perspective view which shows the lamp | ramp of Embodiment 3 of this invention. It is a perspective view which shows the lamp | ramp of Embodiment 4 of this invention. It is a perspective view which shows the lamp | ramp of Embodiment 5 of this invention. It is a perspective view which shows the lamp | ramp of Embodiment 6 of this invention. It is a perspective view which shows the lamp | ramp of Embodiment 7 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a lamp according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view showing a light source unit included in the lamp shown in FIG. As shown in FIG. 1, the lamp 1 </ b> A according to the first embodiment includes a screw-type base 2. In the following description, a straight line passing through the central axis of the base 2 is referred to as a lamp central axis 50 of the lamp 1A. The base 2 side is referred to as “base end side”, and the opposite side is referred to as “tip end side”. The lamp 1A can be used as an alternative to a conventional HID (High Intensity Discharged) lamp in indoor and outdoor lighting fixtures (for example, street lamp fixtures, street lamp fixtures, high ceiling fixtures, etc.). In the installed state, the lamp 1A can be used in any direction, such as the base 2 upward or diagonally upward, the base 2 downward or diagonally downward, and the base 2 laterally.

  The lamp 1 </ b> A includes three light source units 3 arranged around the lamp center axis 50 at intervals, a base-end support 8 that supports the base end of the light source unit 3, and a tip end of the light source unit 3. And a columnar hub portion 10 for connecting the base 2 and the base end side support body 8 to each other. The light source unit 3 has an elongated shape. Each light source unit 3 is arranged so that the longitudinal direction of the light source unit 3 is parallel to the lamp center axis 50. The light source unit 3 extends linearly in a direction parallel to the lamp center axis 50. The three light source units 3 included in the lamp 1A are arranged at an equal distance from the lamp center axis 50 and at equal angular intervals around the lamp center axis 50 (120 ° intervals in the first embodiment). A space surrounded by the three light source units 3 included in the lamp 1A is hereinafter referred to as a “lamp internal space 60”. A space outside the lamp internal space 60 is referred to as a lamp external space. The light source unit 3 is arranged with the light emitting side facing the lamp internal space 60. Each light source unit 3 emits light directly to the lamp internal space 60. Most of the light (light flux or light beam) emitted from each light source unit 3 (for example, 50% or more) passes between the other two light source units 3 (between adjacent light source units 3), and then inside the lamp. The space 60 leads to the lamp external space. The lamp internal space 60 is a united space in which there are no obstacles that block light.

  As shown in FIG. 2, the light source unit 3 includes a light source substrate 4 on which a plurality of LED light sources 5 (light emitting elements) are mounted on the front surface side, a heat sink 6 provided on the back surface side of the light source substrate 4, and the light source substrate 4. And a lens array cover 7 covering from the front side. The light source unit 3 of the first embodiment uses a 1 W to several W class surface mount type small LED package as the LED light source 5. The heat sink 6 includes a flat plate-like portion 6 a that overlaps the back side of the light source substrate 4, and a plurality of plate-like heat radiation fins 6 b that protrude from the surface of the plate-like portion 6 a on the side opposite to the light source substrate 4. The heat radiating fins 6 b are provided along the longitudinal direction of the light source unit 3. The heat sink 6 radiates heat generated by the LED light source 5 to the air. The heat sink 6 is not limited to the illustrated configuration. For example, the heat sink 6 may be provided with pin fins instead of the plate-like heat radiation fins 6b.

  The lens array cover 7 has a convex lens portion 7a that is a light distribution control element. The convex lens portion 7 a is individually provided at a position corresponding to each of the plurality of LED light sources 5 mounted on the light source substrate 4. The light emitted from the LED light source 5 passes through the convex lens portion 7 a and is emitted from the light source unit 3. The beam angle of light emitted from the convex lens portion 7a is narrower than the beam angle of light incident on the convex lens portion 7a from the LED light source 5.

  The light source substrate 4 and the LED light source 5 are sealed by being covered with a heat sink 6 and a lens array cover 7. The lens array cover 7 has translucency and waterproof moisture resistance. The lens array cover 7 is formed to cover the entire light source substrate 4 and the LED light source 5. The constituent material of the lens array cover 7 is desirably a material excellent in moisture resistance, water resistance, light resistance and the like. Alternatively, the lens array cover 7 may be provided with a light-resistant coat, a water-resistant coat, or the like. The joint between the lens array cover 7 and the heat sink 6 has a waterproof and moisture-proof structure. As such a configuration, for example, a mounting groove (not shown) in which the outer periphery of the lens array cover 7 is fitted is formed in the heat sink 6 and the periphery of the fitting is coated with, for example, a silicone-based moisture-proof resin. The structure to do is mentioned. As described above, in the lamp 1A of the first embodiment, the lens array cover 7 is provided, and the waterproof and moistureproof property of the mounting portion is ensured, so that the light source substrate 4 and the LED light source 5 can be reliably protected from the environment. it can. For this reason, since the lamp | ramp 1A whole exhibits the outstanding environmental resistance, it can be preferably used also for the lighting fixture installed outdoors.

  FIG. 3 is a perspective view showing a modification of the lens array cover provided in the light source unit 3. Instead of the lens array cover 7 shown in FIG. 2, the light source unit 3 may be provided with a lens array cover 11 shown in FIG. 3. The lens array cover 11 has a Fresnel lens portion 11a that is a light distribution control element. A plurality of Fresnel lens portions 11 a are provided corresponding to the respective LED light sources 5. The light emitted from the LED light source 5 passes through the Fresnel lens portion 11 a and is emitted from the light source unit 3. The beam angle of light emitted from the Fresnel lens unit 11a is narrower than the beam angle of light incident on the Fresnel lens unit 11a from the LED light source 5. In addition, the light distribution control element in this invention is not limited to the convex lens part 7a and the Fresnel lens part 11a mentioned above. Although illustration is omitted, a cylindrical lens or a linear Fresnel lens extending along the longitudinal direction of the light source unit 3 may be used as a light distribution control element.

  As shown in FIG. 1, the heat sink 6 faces the lamp external space. For this reason, air easily flows around the heat sink 6 by convection or the like, and heat does not accumulate around the heat sink 6. Therefore, excellent heat dissipation is obtained, and the LED light source 5 can be lowered in temperature, so that the LED light source 5 can have high luminous efficiency and long life. In particular, regardless of the direction in which the lamp 1A is installed (the base 2 is upward or diagonally upward, the base 2 is downward or diagonally downward, the base 2 is laterally oriented, etc.), excellent heat dissipation can be obtained in any direction. Further, the heat sink 6 facing the lamp external space promotes heat radiation by radiation from the heat sink 6. Therefore, heat dissipation is further improved.

  The proximal-side support body 8 has a plurality of arm portions that project radially from the distal end portion of the hub portion 10 toward the respective light source units 3. These arm portions are fixed to the base end portion of the heat sink 6 of each light source unit 3. The front end side support body 9 has an annular shape. The tip portion of the heat sink 6 of each light source unit 3 is fixed to the tip side support 9. The front end support 9 has a substantially triangular shape, and the front end of the heat sink 6 is fixed to the apex portion thereof. The fixing method of the light source unit 3 (heat sink 6) and the base end side support body 8 and the front end side support body 9 is not particularly limited. For example, the light source unit 3 (heat sink 6) is fixed by inserting, sliding, screwing, or a combination thereof. Can do. Power can be supplied to each light source unit 3 via a power supply line (not shown) passing through the inside of the base 2, the inside of the hub portion 10, and the inside of the base end support 8. By providing a connector (not shown) that performs electrical connection between the base-end support 8 and the light source unit 3, the assembly of the lamp 1A can be improved.

  It is preferable to form the base end side support body 8 and the front end side support body 9 with a material excellent in heat dissipation or a material having high thermal conductivity (for example, a metal material). Thereby, the heat dissipation from the surface of the base end side support body 8 and the front end side support body 9 can be accelerated | stimulated, and heat dissipation can further be improved. Further, it is desirable that the surface characteristics of the base end side support body 8 and the front end side support body 9 have light diffusibility and high reflectivity. Thereby, the diffusion of light around the lamp 1A can be improved, and a wide light distribution can be achieved.

  FIG. 4 is a view of the lamp 1A according to the first embodiment viewed from the front end side of the lamp center shaft 50 (however, the front end support 9 is removed). As shown in FIG. 4, the optical axis 70 of each light source unit 3 passes between the other two light source units 3 (between two adjacent light source units 3). The optical axis 70 is a virtual light beam that is representative of light (light flux or light beam) emitted from the entire light source unit 3. In the light source unit 3 of the first embodiment, a straight line that passes through the center of the arrangement region of the LED light source 5 in the light source substrate 4 and is perpendicular to the light source substrate 4 corresponds to the optical axis 70. As shown in FIG. 4, the optical axis 70 of each light source unit 3 passes through an intermediate point between the other two light source units 3. Thereby, when the light beam or light beam emitted from the light source unit 3 is irradiated from the lamp internal space 60 to the lamp external space, the light beam or light beam can be prevented from being reflected or blocked by the other two light source units 3. , Light irradiation efficiency can be improved. Moreover, in the external appearance of the lamp 1A, the direction of each heat sink 6 can be made the same, and the design is excellent. In the first embodiment, the optical axis 70 of each light source unit 3 intersects the lamp center axis 50.

  In the first embodiment, the three light source units 3 are equidistant from the lamp center axis 50 and arranged at equal angular intervals around the lamp center axis 50, so that the periphery of the lamp 1A is reached. The light distribution can be equalized. Further, the outer shape of the lamp 1A can be made an outer shape close to a substantially cylindrical shape such as a conventional mercury lamp. In this way, in terms of shape and light emission characteristics, it is possible to obtain a lamp 1A suitable for replacement of a conventional mercury lamp or the like.

  In order to suppress the rate at which the light beam or light beam emitted from the light source unit 3 to the lamp internal space 60 is reflected or blocked by another light source unit 3, the width of the light source unit 3 is narrow (the light source unit 3 is elongated). desirable. In recent years, the light emission characteristics of LEDs (miniaturization and higher efficiency of semiconductor chips) have been dramatically improved. For this reason, it is expected that the light source unit 3 can be further downsized (thinned). As a result, the light irradiation efficiency of the lamp 1A can be further improved.

  Since the light source unit 3 faces the lamp internal space 60, light is directly emitted from the light source unit 3 to the lamp internal space 60. For this reason, since light does not reflect or attenuate when light enters the lamp internal space 60 from the light source unit 3, high light irradiation efficiency can be obtained. Therefore, good energy consumption efficiency can be obtained, and it is advantageous for increasing the luminous flux of the lamp 1A.

  According to the lamp 1A, by appropriately setting the length of the light source unit 3 in the longitudinal direction, the ratio of the lamp emission area to the lamp length can be arbitrarily set. For example, when the lamp 1A is used as an alternative to the conventional mercury lamp, the effective light emission area can be widened in accordance with the lamp light emission area ratio with respect to a predetermined lamp length.

  In the first embodiment, the light source unit 3 is provided with a light distribution control element (convex lens portion 7a, Fresnel lens portion 11a) that narrows the light distribution characteristic, and thus the light is emitted from the light source unit 3 to the lamp internal space 60. The ratio of the reflected light beam or light beam reflected or blocked by the other light source unit 3 can be more effectively suppressed, and the light irradiation efficiency of the lamp 1A can be further improved. In the first embodiment, a plurality of light distribution control elements are integrally formed as a lens array, and the light source board 4 and the LED light source 5 are covered as a waterproof and moisture-proof cover, thereby reducing the number of components. Thus, it is possible to obtain the lamp 1A suitable for outdoor environment use.

  FIG. 5 is a view for explaining the beam angle of the light source unit 3 in a cross section perpendicular to the lamp central axis 50. The beam angle of the light source unit 3 on the left side in FIG. 5 will be described. A half beam angle of light emitted from the light source unit 3 is defined as θ. The 1/2 beam angle is an opening angle of light that becomes a half of the maximum luminous intensity. The luminous intensity b at the position of the optical axis 70 of the light source unit 3 is maximized. A double angle of the angle at which the luminous intensity a is ½ of the maximum luminous intensity b with respect to the optical axis 70 corresponds to a ½ beam angle. Line segments 80 and 81 are line segments that connect the light source unit 3 and the other two light source units 3 through which the optical axis 70 of the light source unit 3 passes. That is, the line segment 80 connects the light source unit 3 and one of the other two light source units 3, and the line segment 81 connects the light source unit 3 and the other two light source units 3 to each other. tie. The line segments 80 and 81 are drawn so as to connect the same portions of the light source units 3 to each other. It is desirable that the half beam angle θ of the light source unit 3 is equal to or smaller than the angle formed by the line segments 80 and 81. Thereby, the ratio by which the light flux or light beam emitted from the light source unit 3 is reflected or blocked by the other two light source units 3 can be more effectively suppressed, and the light irradiation efficiency of the lamp 1A can be further improved. FIG. 5 shows a case where the size of the half beam angle θ of the light source unit 3 is equal to the size of the angle formed by the line segments 80 and 81. In the above description, the beam angle of the light source unit 3 on the left side in FIG. 5 has been described. However, it is desirable that the beam angles of the other light source units 3 included in the lamp 1A satisfy the same conditions.

  In the first embodiment, a surface mount type small LED package (LED light source 5) is used as the light emitting element of the light source unit 3, but the light emitting element in the present invention is not limited to this, for example, A COB (Chip on Board) type LED light source having a large luminous flux of thousands to tens of thousands of lm / piece may be used. The COB type LED light source has a structure in which a plurality of LED bare chips are directly mounted on a heat radiating substrate such as a metal substrate or a ceramic substrate and resin-sealed. Alternatively, a bullet-type LED may be used as the light emitting element. Since the bullet-type LED has high directivity, the beam angle condition described above can be satisfied even without a light distribution control element. Moreover, in this invention, you may use not only an LED light source but an organic EL light source etc. as a light emitting element, for example.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 6 and FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. The description is omitted. FIG. 6 is a perspective view showing a lamp according to Embodiment 2 of the present invention. 7 is a view of the lamp 1B shown in FIG. 3 as viewed from the front end side of the lamp center shaft 50 (however, the front end support 9 is removed).

  As shown in FIG. 6, the lamp 1 </ b> B of the second embodiment includes four light source units 3. The four light source units 3 are arranged at an equal distance from the lamp center axis 50 and at equal angular intervals around the lamp center axis 50 (90 ° intervals in the second embodiment). The base end side support body 8 has an annular portion 8a having an annular shape and a plurality of arm portions 8b. The annular portion 8a is substantially square (substantially square), and the base end portion of the heat sink 6 of each light source unit 3 is fixed to the apex portion thereof. The plurality of arm portions 8b protrude radially from the distal end portion of the hub portion 10 and are connected and fixed to the annular portion 8a. The front end side support body 9 has a substantially quadrangular (substantially square) annular shape, and the front end portion of the heat sink 6 of each light source unit 3 is fixed to the apex portion thereof.

  As shown in FIG. 7, the optical axis 70 of each light source unit 3 passes between the other two adjacent light source units 3. Between two adjacent light source units 3, only the optical axis 70 of the other one light source unit 3 passes. The optical axes 70 of the plurality of light source units 3 do not pass between two adjacent light source units 3. By doing so, the light distribution around the lamp 1B can be equalized. In the second embodiment, the optical axis 70 of each light source unit 3 does not intersect the lamp center axis 50.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 8 is a perspective view showing a lamp according to Embodiment 3 of the present invention.

  A lamp 1 </ b> C according to the third embodiment shown in FIG. 8 includes five light source units 3. The five light source units 3 are arranged at an equal distance from the lamp center axis 50 and at equal angular intervals around the lamp center axis 50 (72 ° intervals in the third embodiment). The front end side support body 9 has a substantially pentagonal annular shape, and the front end portion of the heat sink 6 of each light source unit 3 is fixed to the apex portion thereof.

  The optical axis 70 of each light source unit 3 passes between the other two light source units 3 having the longest distance from the light source unit 3. Between two adjacent light source units 3, only the optical axis 70 of the other one light source unit 3 passes. The optical axes 70 of the plurality of light source units 3 do not pass between two adjacent light source units 3. By doing so, the light distribution around the lamp 1C can be equalized. In the third embodiment, the optical axis 70 of each light source unit 3 intersects the lamp center axis 50.

  In Embodiments 1 to 3 described above, the case where the number of light source units 3 is 3 to 5 has been described. However, the number of light source units 3 in the present invention may be 6 or more. As in the first and third embodiments, when the number of light source units 3 is an odd number, the optical axis 70 of each light source unit 3 can be configured to intersect the lamp center axis 50. In this case, it is advantageous to equalize the light distribution around the lamp.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 9 is a perspective view showing a lamp according to Embodiment 4 of the present invention.

  The lamp 1D according to the fourth embodiment shown in FIG. 9 is the same as the lamp 1A according to the first embodiment, except that the translucent cover 12 that covers the space (opening) between the adjacent light source units 3 is provided. is there. The translucent cover 12 is a flat plate member made of a translucent material. The translucent cover 12 has a shape matching a rectangular opening formed between two adjacent light source units 3. The translucent cover 12 is installed between three sets of adjacent light source units 3. That is, the lamp 1 </ b> D includes the same number of translucent covers 12 as the number of the light source units 3. The translucent cover 12 serves as a wall that separates the lamp internal space 60 from the lamp external space. The light directly emitted from the light source unit 3 to the lamp internal space 60 is guided from the lamp internal space 60 to the lamp external space by passing through the translucent cover 12. Each side of the tip-side support 9 having a substantially triangular shape and one side perpendicular to the lamp central axis 50 of each translucent cover 12 are contacted or fixed with almost no gap. Two sides parallel to the lamp central axis 50 of each translucent cover 12 are in contact with or fixed to the sides in the longitudinal direction of the light source unit 3 with almost no gap. By providing the translucent cover 12, it is possible to prevent dirt from adhering to the surface from which the light of the light source unit 3 is emitted (the surface of the lens array cover 7). Unlike the structure of Patent Document 2, there is no translucent cover near the light emitting surface side of the light source unit 3, and the number of times the light emitted from the light source unit 3 passes through the translucent cover 12 is one. Times. For this reason, compared with the structure of patent document 2, the fall of the light irradiation efficiency of a lamp | ramp can be suppressed.

  The translucent cover 12 desirably has a function of diffusing light. Although not shown in the figure, the surface of the translucent cover 12 is provided with a fine structure for diffusing light (for example, a fine prism-like pattern, a fine triangular prism-like stripe pattern, etc.), so that the light is refracted. A function of diffusing can be imparted to the translucent cover 12. When the light-transmitting cover 12 has a function of diffusing light, when the light emitted from the light source unit 3 passes through the light-transmitting cover 12 and irradiates the space outside the lamp, it is around the lamp 1D. Diffuse light emission can be performed, and the light distribution around the lamp 1D can be made more uniform. It is desirable that the fine structure for diffusing light is not formed on the inner surface of the translucent cover 12 but only on the outer surface of the translucent cover 12. Thereby, light loss due to multiple reflection in the lamp internal space 60 can be suppressed.

  A translucent cover (not shown) that covers the opening formed by the annular front end support 9 may be further provided on the lamp 1D. Thereby, it can suppress more effectively that dirt adheres to the field (surface of lens array cover 7) where the light of light source unit 3 emits.

Embodiment 5 FIG.
Next, the fifth embodiment of the present invention will be described with reference to FIG. 10. The description will focus on the differences from the fourth embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 10 is a perspective view showing a lamp according to Embodiment 5 of the present invention.

  The lamp 1E of the fifth embodiment shown in FIG. 10 is the same as the lamp 1D of the fourth embodiment except that the shape of the translucent cover 12 is different. The translucent cover 12 included in the lamp 1E of the fifth embodiment has a curved shape so that the lamp external space side is convex. The translucent cover 12 preferably has a shape that curves along a cylindrical surface having the lamp central axis 50 as a generating line. Thereby, the shape of the lamp | ramp 1E of the part enclosed by the translucent cover 12 can be made into a substantially cylindrical shape. As a result, the wide light distribution can be further improved, and the light incident angle of light is different from that in the case of a flat cover, whereby the light transmittance can be further improved and the design can be further improved.

Embodiment 6 FIG.
Next, a sixth embodiment of the present invention will be described with reference to FIG. 11. The description will focus on the differences from the fourth embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 11 is a perspective view showing a lamp according to Embodiment 6 of the present invention.

  The lamp 1F according to the sixth embodiment shown in FIG. 11 is the same as the lamp 1D according to the fourth embodiment except that the shape of the base end support 8 is different. The proximal end support 8 provided in the lamp 1F of the sixth embodiment has a substantially triangular shape. Four sides of the translucent cover 12 are contacted or fixed to the two adjacent light source units 3, one side of the base end side support body 8, and one side of the front end side support body 9 with almost no gap. With such a configuration, in the sixth embodiment, the translucent cover 12 can more reliably suppress dust from entering the lamp internal space 60. For this reason, compared with Embodiment 4, it can suppress more effectively that stain | pollution | contamination adheres to the surface (surface of the lens array cover 7) which the light of the light source unit 3 radiate | emits.

Embodiment 7 FIG.
Next, a seventh embodiment of the present invention will be described with reference to FIG. 12. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 12 is a perspective view showing a lamp according to Embodiment 7 of the present invention.

  The lamp 1G according to the seventh embodiment shown in FIG. 12 is the same as the lamp 1A according to the first embodiment except that the shape of the base end side support 8 is different and the heat pipe 13 is provided. The base end side support 8 included in the lamp 1G of the seventh embodiment has a substantially triangular shape. The lamp 1 </ b> G includes three rectangular openings surrounded by two adjacent light source units 3, one side of the base-side support 8, and one side of the tip-side support 9. The heat pipe 13 has a rectangular ring shape that matches the shape of the opening. The heat pipe 13 is attached so as to be in contact with two adjacent light source units 3, one side of the base end side support body 8, and one side of the front end side support body 9. The heat pipes 13 are provided at the edges of the three openings. In the seventh embodiment, by providing the heat pipe 13, the heat dissipation can be further improved, and the temperature of the LED light source 5 can be further reduced. In particular, regardless of the direction in which the lamp 1G is installed (the base 2 is upward or diagonally upward, the base 2 is downward or diagonally downward, the base 2 is laterally oriented, etc.), excellent heat dissipation can be obtained in any direction.

  Although the embodiments of the present invention have been described above, the present invention may be implemented by arbitrarily combining features of the above-described embodiments. In each of the above-described embodiments, the longitudinal direction of the light source unit 3 is parallel to the lamp center axis 50. However, in the present invention, the longitudinal direction of the light source unit 3 is centered on the proximal end side or the distal end side. The lamp central axis 50 may be inclined. The inclination angle when the longitudinal direction of the light source unit 3 is inclined with respect to the lamp central axis 50 is preferably about 30 ° or less, for example. That is, the longitudinal direction of the light source unit 3 may be a direction of, for example, about 0 ° to 30 ° with respect to the lamp central axis 50.

1A, 1B, 1C, 1D, 1E, 1F, 1G lamp, 2 base, 3 light source unit, 4 light source board, 5 LED light source, 6 heat sink, 6a plate-like part, 6b heat radiation fin, 7 lens array cover, 7a convex lens part , 8 Base end side support body, 8a annular part, 8b arm part, 9 distal end side support body, 10 hub part, 11 lens array cover, 11a Fresnel lens part, 12 translucent cover, 13 heat pipe, 50 lamp central axis , 60 Lamp internal space, 70 optical axes, 80, 81 line segments

Claims (9)

Comprising three or more light source units spaced around the central axis of the lamp,
A lamp in which light emitted from each of the light source units to a lamp internal space surrounded by the three or more light source units passes between the other two light source units and is guided to the lamp external space.   2. The lamp according to claim 1, wherein each of the light source units has an elongated shape whose longitudinal direction is a direction parallel to or inclined with respect to the central axis of the lamp.   Each of the light source units includes a light emitting element and a light distribution control element, and a beam angle of light emitted from the light distribution control element as compared with a beam angle of light incident on the light distribution control element from the light emitting element. The lamp according to claim 1, wherein the lamp is narrow.   In a cross section perpendicular to the lamp central axis, the 1/2 beam angle of the light emitted from each of the light source units is the other two between the light source unit and the optical axis of the light emitted from the light source unit. The lamp according to any one of claims 1 to 3, wherein the angle is equal to or less than an angle formed by two line segments respectively connecting the light source units.   5. The lamp according to claim 1, wherein each of the light source units includes a heat sink provided on a side opposite to a light emitting side, and the heat sink faces the lamp external space.   The lamp according to any one of claims 1 to 5, further comprising a translucent cover that covers a space between adjacent light source units.   The lamp according to claim 6, wherein the translucent cover has a function of diffusing light.   The said three or more said light source units are arrange | positioned at equiangular intervals around the said lamp | ramp center axis | shaft and equidistant from the said lamp | ramp center axis | shaft. lamp.   The lamp according to any one of claims 1 to 8, further comprising a heat pipe provided along an edge of an opening formed between the two adjacent light source units.

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