JP2021157903A - Lighting fixture - Google Patents

Abstract

To provide a lighting fixture which maintains a temperature of an inside of a housing lower than an allowable temperature in spite of a configuration that the housing is a vertical or lateral light distribution type and made of a woody material and only the wood and a light transmission plate are visible in an appearance.SOLUTION: A lighting fixture is a vertical light distribution type in which an opening is not exposed over an entire outer surface of an instrument body of which an entire outer surface is formed from a substantially columnar woody part 3 and light transmissive covers 4a and 4b. The lighting fixture comprises a metallic heat dissipation part 10a including: a first heat dissipation member 11a which is fixed while being held between a bottom face of an upper first substrate 8 and the woody part 3; a second heat dissipation member 12a which is fixed while being held between a top face of a lower second substrate 9 and the woody part 3; and a heat dissipation member 13a for connection which is disposed in an inserted state into a thin penetration groove for connecting the first heat dissipation member 11a and the second heat dissipation member 12a and communicating a bottom part which is a deep surface of an upper first recess 5 of the woody part 3 with a top face which is a deep surface of a lower second recess 6.SELECTED DRAWING: Figure 7

Description

The present invention relates to a vertical light distribution type or left and right light distribution type lighting fixture using a wood-based material for the main body of the lighting fixture.

In Patent Document 1, a wooden base member having a concave portion at least partially, a light source portion having an LED arranged in the concave portion and irradiating light, and the light source portion are arranged on an upper surface. A lighting device including a metal heat radiating member having an area larger than that of the light source portion that dissipates heat from the light source portion is disclosed.

Patent Document 2 includes a straight-tube light source, sockets that support both ends of the straight-tube light source, a terminal block for receiving power from the outside, and the straight-tube light source, socket, and terminal block. The housing has a pair of side plates arranged to face each other and fixing portions provided at both ends in the longitudinal direction of the side plates to fix the side plates. Disclosed is a luminaire having a groove portion for fixing the fixing portion, which extends along the longitudinal direction of the side plate on the opposite inner surface of the side plate.

Japanese Unexamined Patent Publication No. 2013-120732 Japanese Unexamined Patent Publication No. 2013-175416

The invention of Patent Document 1 uses wood for the main body of the appliance, but it is a light source that distributes light in only one direction, and it is not possible to illuminate the ceiling direction in the upward direction and the floor surface direction in the downward direction with different light sources. There was a problem.

Further, as a countermeasure against heat generation of the light source, as an example, an opening is provided on the outer surface of the instrument body to dissipate heat, but there is a problem that the presence of the opening impairs the aesthetic appearance of the outer surface of the instrument body.

Furthermore, in the case where the outer surface of the instrument body is made of wood-based material and light-transmitting material and no opening is provided on the entire outer surface, as a measure against heat generation of the light source, aluminum is added to the air in the space formed inside the recess. There is a description that heat is dissipated from the heat dissipation part of the light source, but since the heat transfer rate of air is extremely low at 0.0257 W / mK, the heat dissipation part of aluminum becomes high heat and exceeds the heat resistant temperature of the light source, so the life of the LED element is shortened. There was a problem of letting it.

The invention of Patent Document 2 is a vertical light distribution type lighting fixture, but a single straight tube type light source is used to distribute light vertically with an opening in the vertical direction of the straight tube type light source, and illuminance in the upward direction. Since it is not possible to make the illuminance in the downward direction different, there is a problem that it is not possible to create an atmosphere of a room in which the brightness of the ceiling side and the brightness of the floor surface side of a Japanese room or a living room are different.

Further, since the straight tube type light source can be seen directly from the opening, there is a problem that the atmosphere of the Japanese-style room or the living room is impaired by the appearance of the lighting equipment.

The present invention was devised in view of these problems, and the brightness of the light distribution in the upward direction and the downward direction, or the brightness of the light distribution in the right direction and the left direction can be set to different brightness or the same brightness. An object of the present invention is to provide a lighting fixture capable of effectively dissipating heat while having a structure in which the internal LED light source cannot be seen from the appearance of the fixture body and only the wood-based material and the light transmissive cover can be seen.

In the present invention, the first direction and the second direction mean opposite directions, for example, when the first direction is upward, the second direction means downward, or the first direction. When the direction is to the right, the second direction means to the left.

The luminaire according to claim 1 is a luminaire in which an opening is not exposed on the entire outer surface of the luminaire body in which the entire outer surface is formed by a substantially columnar woody portion and a light transmitting cover. A woody portion having a long first recess having an opening formed in the first direction, a long second recess having an opening formed in the second direction, and an opening of the first recess. It has a first light-transmitting cover that covers the first light-transmitting cover and a second light-transmitting cover that covers the opening of the second recess, and distributes light only in the first direction arranged in the deep part of the first recess. A first substrate in which a plurality of LED light sources are arranged at predetermined intervals, and a second substrate in which a plurality of LED light sources that distribute light only in the second direction are arranged at predetermined intervals, which are arranged in the deep part of the second recess. The first heat radiation member is fixed to the deep surface of the first recess of the wood part in a state of being sandwiched between the first substrate and the wood part, and the wood part is sandwiched between the second substrate and the wood part. It is arranged in an inserted state in a narrow through groove that communicates the second heat radiation member fixed to the deep surface of the second recess and the deep surface of the first recess and the deep surface of the second recess. It is characterized in that a heat radiating portion made of metal having the first heat radiating member and the connecting radiating member connected to the second radiating member is provided.

The luminaire according to claim 2 has a shape in which the heat radiating portion has a substantially square shape or a substantially H shape in a horizontal cross section in the lateral direction of the wood portion in claim 1. It is characterized by.

The luminaire according to claim 3 is characterized in that, in claim 1 or 2, the thickness of the heat radiating member for connection and the width of the narrow through groove in the lateral direction are substantially the same length.

The lighting fixture according to claim 4 is characterized in that, in any one of claims 1 to 3, the woody portion is a solid long material.

In the luminaire according to claim 1, since the first light transmitting cover and the other side surfaces of the second light transmitting cover are all made of wood, for example, the pattern of the annual ring seen in the cross section of the tree should be represented on the outer surface. Because of this, it is possible to bring out the attractiveness of the design of the outer surface, and even though the opening and heat dissipation part are not exposed on the outer surface, the heat generation of the LED light source can be realized below the heat resistant temperature, so the life of the LED element can be extended. It has the effect of not shortening.

The lighting fixture according to claim 2 has an effect of dissipating heat generated by the LED light source even though the opening and the heat radiating portion are not exposed on the outer surface.

The lighting fixture according to claim 3 has an effect of enhancing the heat transfer effect from the metal heat-dissipating member for connection to the wood which is a woody part.

The lighting fixture according to claim 4 has an effect that the aesthetic appearance is enhanced because the wood part is a solid long material and there is no seam of wood and there is a sense of unity of annual rings and colors.

It is a figure which shows the state which hung the luminaire of this invention. Explanatory drawing (excluding cords and the like) for explaining the appearance of the luminaire of the present invention, (a) is an explanatory view for a plan view, (b) is an explanatory view for a front view, and (c) is a right side view. It is a figure of. It is explanatory drawing of the plan view in the state which the 1st light transmissive cover of the luminaire of this invention is removed. FIG. 3 of the luminaire of the present invention is a cross-sectional outline explanatory view in the lateral direction, (a) is a cross-sectional outline explanatory view of the AA cross section, and (b) is a cross-sectional outline explanatory view of the BB cross section. c) is a cross-sectional outline explanatory view of the CC cross section. FIG. 3 is a plan view showing a state in which the LED light source and the first substrate are arranged. It is sectional drawing of the cross section of the vertical cross section when cut in the longitudinal direction at the center of the luminaire of this invention in the lateral direction. FIG. 6 is a cross-sectional outline explanatory view of the DD cross section in FIG. It is sectional drawing schematic explanatory drawing at the position corresponding to the DD cross section of Example 1 in the case of Comparative Example 8. FIG. 5 is an explanatory diagram of a temperature distribution in a cross section in the lateral direction of the lighting fixture in the first embodiment. It is a temperature distribution explanatory view in the lateral cross section of the luminaire in Comparative Example 8. It is sectional drawing schematic explanatory view at the position corresponding to the DD cross section of Example 1 in the case of Comparative Example 2. FIG. In the explanatory view of the lighting fixture of Comparative Example 1, (a) is an explanatory view of a plan view of only a wooden portion, and (b) is a schematic explanatory view of a plan view in which an LED light source and a substrate are attached to (a). In the explanatory view of the luminaire of Comparative Example 1, (a) is a cross-sectional outline explanatory view of the vertical cross section when the luminaire is cut in the longitudinal direction at the center in the lateral direction, and (b) is E in (a). -E is a cross-sectional outline explanatory view of the cross section, (c) is a cross-sectional outline explanatory view of the FF cross section in (a). It is explanatory drawing of the luminaire of the comparative example 3, and is the schematic explanatory view of the form which removed the 1st and 2nd light transmissive covers in FIG. In the explanatory view of the luminaire of Comparative Example 4, (a) is a cross-sectional outline explanatory view of the vertical cross section when cut in the longitudinal direction at the center in the lateral direction, and (b) is the MM cross section of (a). It is a cross-sectional outline explanatory view of. In the explanatory view of the lighting fixture of Comparative Example 5, (a) is an explanatory view of a wooden portion in a plan view, and (b) is a plan view view showing a state in which an LED light source and a first substrate are arranged in (a). , (C) is a cross-sectional outline explanatory view of a vertical cross section when cut in the longitudinal direction at the center in the lateral direction. In the explanatory view of the luminaire of Comparative Example 5, (a) is an explanatory view of a cross section of the GG cross section in FIG. 16 (c), and (b) is an explanatory view of the cross section of the HG cross section in FIG. 16 (c). It is a figure. In the explanatory view of the luminaire of Comparative Example 6, (a) is an explanatory view of a plan view when the first light transmissive cover is removed, and (b) is a view when cut in the longitudinal direction at the center in the lateral direction. It is a cross-sectional outline explanatory view of the vertical cross section, (c) is the cross-sectional outline explanatory view of the KK cross section in (b). In the explanatory view of the luminaire of Comparative Example 7, (a) is an explanatory view of a plan view when the first light transmissive cover is removed, and (b) is a view when cut in the longitudinal direction at the center in the lateral direction. It is a cross-sectional outline explanatory view of the vertical cross section, (c) is the cross-sectional outline explanatory view of the LL cross section in (b). An explanatory view of the form of the heat radiating part and the form of the blower fan, (a) is an explanatory view when the heat radiating part is in the form of a thin plate, and (b) is an L-shaped part having a thickness of 1 mm. In the case of the form, (c) is an explanatory view in the case of an L-shaped form in which the portion constituting the heat radiating portion is 3 mm thick, and (d) is an explanatory view in the case where the heat radiating portion is in the form of a prism. (E) is an explanatory diagram of the form of the blower fan. It is a figure which shows the measured temperature in the elapsed time from turning on, (a) is a figure which shows the temperature change in the case of the comparative example 1 which is a conventional form, and (b) is a figure which is the embodiment of this invention Example 1. It is a figure which shows the temperature change in the case of. It is a figure which shows the use example of the luminaire of this invention, (a) is the figure which shows the use example of the wall-mounted type, and (b) is the figure which shows the use example of the stand type.

The lighting fixture 1 of the present invention is hung from the ceiling of a Japanese-style room or a living room as shown in FIG. 1, and can be used as a wall-mounted type as shown in FIG. ), It is used as a stand type that stands on the floor. Then, it is a vertical light distribution type that distributes light in the upward and downward directions, or a left and right light distribution type that distributes light in the right and left directions, and the illuminance of the light distribution in the first direction and the distribution in the second direction. It is a lighting fixture 1 in which a wooden material is used as a housing, that is, a fixture main body 2, which can change the illuminance of light to different illuminances. Then, as shown in FIG. 2, the heat radiating portion 10 that dissipates heat generated by the LED light source 7, the first substrate 8 or the second substrate 9 is not exposed, and the heated air inside is convected with the air at room temperature outside. It is a lighting fixture that has a form in which the opening is not exposed, and can enhance the design of the appearance by making only the wood part 3 and the light transmitting cover 4 visible from the outside.

1 to 19 and 22 (a) show a form in which the first direction is upward and the second direction is downward, and only in FIG. 22 (b), the first direction and the second direction are left and right. It shows the morphology of the direction.

It is said that the life of the LED light source 7 is shortened when the temperature of the first substrate 8 or the second substrate 9 exceeds the heat resistant temperature of the LED light source 7 or the like due to the heat generated by the LED light source 7, the first substrate 8 or the second substrate 9. There's a problem. Therefore, the structure is such that the heat radiating portion 10 is not exposed on the outer surface and the opening that enables air convection with the outside is not exposed. As a requirement, the inventor has developed a technique for maintaining the temperature of the LED light source, the first substrate 8 or the second substrate 9 below the heat resistant temperature of the LED light source 7, and solved the problem. I came up with a technology that can be done.

The luminaire 1 is a luminaire 1 in which an opening is not exposed on the entire outer surface of the luminaire body 2 in which the entire outer surface is formed by a substantially columnar wooden portion 3 and light transmitting covers 4a and 4b. Reference numeral 2 denotes a wooden portion 3 having a long first recess 5 having an opening formed in the first direction and a long second recess 6 having an opening formed in the second direction. It has a first light-transmitting cover 4a that covers the opening of the first recess 5, and a second light-transmitting cover 4b that covers the opening of the second recess 6, and is arranged in the deep part of the first recess 5. A first substrate 8 in which a plurality of LED light sources 7 that distribute light only in the first direction are arranged at predetermined intervals, and a plurality of LED light sources 7 that are arranged in a deep portion of the second recess 6 and distribute light only in the second direction. The second substrate 9 is provided with the LED light sources 7 arranged at predetermined intervals, and is fixed to the deep surface of the first recess 5 of the wood portion 3 in a state of being sandwiched between the first substrate 8 and the wood portion 3. (1) The second heat radiating member 12 fixed to the deep surface of the second recess 6 of the wood portion 3 in a sandwiched state between the second substrate 9 and the wood portion 3, and the first recess 5 of the heat radiating member 11. A connecting heat-dissipating member connected to the first heat-dissipating member 11 and the second heat-dissipating member 12 arranged in an inserted state in a narrow through groove 20 that communicates the deep surface with the deep surface of the second recess 6. A heat radiating portion 10 made of a metal having 13 is provided.

As shown in FIG. 1 or 2, the luminaire 1 has a long shape having, for example, a length of 1616 mm, a width of 28 mm, and a height of 100 mm. The fixture body 2 is composed of the wood portion 3 and the light transmissive covers 4a and 4b, and the metal and ventilation of the heat radiating portion 10 are provided on the entire outer surface of the fixture body 2 which forms the entire outer surface of the fixture body 2. This is a lighting fixture 1 that does not expose holes or openings used for such purposes. Therefore, the appearance of the lighting fixture 1 can be designed to take advantage of the grain of wood.

The wood part 3 may be a wooden rectangular parallelepiped columnar body as a material, and may be a material obtained by artificially reconstructing wood or a solid wood. Solid wood looks better. Then, for example, in a solid wood, a long first recess 5 having an opening formed in the first direction of the solid wood and a long second recess 6 having an opening formed in the second direction are formed. Form. The lateral width of the first recess 5 or the second recess 6 is set to any of 12 to 20 mm.

Then, as shown in FIG. 4A showing a form in which the first direction is upward and the second direction is downward, the bottom surface, which is the deep surface of the first recess 5 of the woody portion 3, and the first portion. A narrow through groove 20 in the vertical direction is provided between the two recesses 6 and the top surface which is the deep surface of the recess 6, and as shown in FIGS. 3, 4 (a) and 4 (b), the said in the first direction. A step 22 for mounting the first light transmissive cover 4a is formed on the peripheral edge of the opening 5, and the second light transmissive is formed on the inner peripheral wall of the opening in the second direction. Horizontal grooves 23 are provided on the facing surfaces in the lateral direction so that both ends of the cover 4b in the lateral direction can be fitted and inserted. The depth of the step 22 is preferably substantially the same as the thickness of the first light transmitting cover 4a, and the height of the groove 23 in the vertical direction is preferably substantially the same as the thickness of the second light transmitting cover 4b. In the case of the left-right light distribution type lighting fixture 1, the step 22 has a groove 23.

The size of the xylem 3 is, for example, 1 m to 1.8 m in length, 25 to 50 mm in width, and 80 to 120 mm in height, but it is substantially columnar and has a quadrangular cross section in the lateral direction. If there is, the size can be set arbitrarily. Further, the thickness of the peripheral wall portion of the first recess 5 or the second recess 6 of the xylem 3 and the thickness of the outer wall surface of the through hole 20 can be any thickness as long as they are not deformed when an impact is applied. Often, for example, it is 6 mm or more.

Next, the first light transmitting cover 4a or the second light transmitting cover 4b may be a thin plate-like body that transmits light, and is an organic glass-like transparent plate made of a synthetic resin such as an acrylic resin. There is glass. The plate thickness is, for example, 2 to 5 mm, but any thickness may be used as long as it can transmit light.

As shown in FIG. 6, the first light transmissive cover 4a is placed on the step 22 of the xylem 3 to cover the opening of the long upper first recess 5 and the second light. The transmission cover 4b is fitted into the groove 23 and covers the opening of the long lower second recess 6. When the second light transmitting cover 4b is fitted into the groove 23, the second light transmitting cover 4b can be inserted through the opening of the lower second recess 6 and turned in the opening. The second light transmitting cover 4b can be fitted and inserted into the groove 23 in a state where the groove 23 is not exposed on the side surface of the woody portion 3.

Regarding the first substrate 8 and the second substrate 9, as shown in FIG. 7, the upper first substrate 8 is fixed to the bottom surface which is the deep surface of the first recess 5, or the lower second substrate is fixed. Reference numeral 9 denotes a long and thin plate shape fixed to the top surface which is the deep surface of the second recess 6, and as shown in FIG. 5, the LED light sources 7 are arranged in a row at predetermined intervals. A plurality of LEDs are arranged. The first substrate 8 and the second substrate 9 are provided with wiring (not shown) connecting the power supply (not shown) and each LED light source.

The LED light source 7 is fixed to the bottom surface, which is the deep surface of the upper first recess 5, and the LED light source 7 distributes light only in the upper direction, which is the first direction. The LED light source 7 fixed to a certain top surface distributes light only in the downward direction, which is the second direction. As a result, the brightness of the upward light distribution in the first direction and the brightness of the downward light distribution in the second direction can be made different or the same, and can be used in Japanese-style rooms and living rooms. Compared to pendant lighting equipment that distributes light only below in one direction, the atmosphere of the space can be changed. The brightness of the LED light source 7 group fixed to the first recess 5 is set to, for example, 20 W, and the brightness of the LED light source 7 group fixed to the second recess 6 is set to, for example, the brightness of the LED light source 7 fixed to the first recess 5. It can be equivalent to 32W so as to be bright.

All of the electrical energy loss that is not emitted as light becomes heat, but it is known that since the LED light source 7 itself is sensitive to heat, when it becomes high heat, it accelerates deterioration, the brightness decreases, and the life is shortened. There are two types, one is that the heat radiating part made of aluminum, which is generally used as a heat radiating means, is exposed to the outside air, and the other is that the heat radiating part made of aluminum is brought into contact with the outside air by providing openings and holes. From the viewpoint of design emphasis, the present invention does not adopt a form in which the heat radiating unit 10 is exposed to the outside air or a form in which the heat radiating part 10 is brought into contact with the outside air by providing openings and holes, and the temperature of the LED light source 7 is adjusted. It is a technology to keep the temperature below the permissible temperature.

As shown in FIG. 7, the heat radiating means of the present invention includes a thin plate-shaped first heat radiating member 11a fixed between the bottom surface of the first substrate 8 on the upper side and the woody portion 3 in a sandwiched state, and a lower side. A thin plate-shaped second heat radiating member 12a fixed between the upper surface of the second substrate 9 and the woody portion 3 in a sandwiched state, and as shown in FIG. 4, the first heat radiating member 11a and the second heat radiating member. Inserted into a narrow through groove 20 in the vertical direction that connects the bottom portion of the first recess 5 of the woody portion 3 and the top surface of the second recess 6 which is the deep surface of the wood portion 3 to be connected to the member 12a. The heat radiating portion 10 is made of metal and has the connecting heat radiating member 13a arranged in the state.

The heat radiating portion 10 is a cross section of the woody portion 3 in the lateral direction, and has a substantially square shape or a substantially H shape (not shown) as shown in FIG. 7, and the material thereof is Aluminum with high thermal conductivity. The thermal conductivity of aluminum varies depending on the alloy, but it is about 200 W / mK, so it has high heat conductivity.

Then, in the lighting fixture 1, the thickness of the heat radiating member 13 for connection and the width in the lateral direction of the narrow through groove 20 are substantially the same length, and the heat radiating portion 10 made of aluminum and the wood of the woody portion 3 are formed. Make contact. As a result, the heat of the LED light source 7, the first substrate 8, and the second substrate 9 is transferred to the woody portion 3 while being stored in the heat radiating portion 10 made of aluminum. The thermal conductivity of the xylem 3 is 0.12 W / mK for cypress, cedar and spruce, and 0.15 W / mK for lauan material, so heat dissipation is better than exposing the heat radiating part 10 made of aluminum directly to the air. move on. Then, the heat storage of the wood part 3 is transferred to the outside air. The wood part 3 has both heat storage, heat transfer and design.

As a result, from the viewpoint of emphasizing the design, the appearance of the heat radiating part 10 is not exposed to the outside air, and the heat radiating part 10 is brought into contact with the outside air by providing openings and holes. The temperature of the LED light source 7, the first substrate 8 or the second substrate 9 can be maintained at an allowable upper limit temperature of the LED light source 7, for example, less than 70 ° C., while using a good solid material.

The first embodiment is a case where the first direction is upward and the second direction is downward. It is composed of a wooden portion 3 as shown in FIG. 3, an LED light source 7 as shown in FIGS. 5 and 6, an arrangement of a first substrate 8 or a second substrate 9, and an arrangement of a heat radiating portion 10 as shown in FIG. In addition, using a lighting fixture with external dimensions of 1616 mm in length in the longitudinal direction, 28 mm in width in the lateral direction, and 100 mm in height, the calorific value of the LED light source that distributes light upward at room temperature 25 ° C. is 0. 144 1W / piece is arranged and the total calorific value is 14.4W, and the calorific value of the LED light source that distributes the light downward in the second direction is 0.155W / piece and 144 pieces are arranged and the total calorific value is 22.32W. The temperature was measured at. The temperature measurement sensors were installed in a substantially central portion of the first substrate 8 in which the upper LED light source 7 was arranged and in a substantially central portion of the second substrate 9 in which the lower LED light source 7 was arranged.

As a result, the temperature of the upper LED 7 that distributes light upward in the first direction is 53.53 ° C, and the temperature of the lower LED 7 in the second direction is 58.3 ° C, which is the upper limit temperature of the LED light source 7. It was possible to bring the temperature well below 70 ° C. Since the inside of the lighting fixture 1 is a closed space, the flow velocity of the airflow inside was 0.001 m / s.

As a comparative example, four forms of the wood part 3, four forms of the aluminum heat radiating part 10, four forms of arrangement of the blower fan 30, and three forms depending on the presence or absence of the light transmissive cover 4 are set. , The temperature was measured by changing the combination. The common point is that, as in Example 1, an LED light source that distributes light upward at a room temperature of 25 ° C. using a lighting fixture with external dimensions of 1616 mm in length in the longitudinal direction, 28 mm in width in the lateral direction, and 100 mm in height. The calorific value of 0.1W / piece is arranged 144 pieces and the total calorific value is 14.4W, and the calorific value of the LED light source that distributes the light downward is 0.155W / piece and 144 pieces are arranged and the total calorific value is 22.32W. And said. Further, each of the comparative examples has the same form as that of the first embodiment, in which the first direction is upward and the second direction is downward.

As a form of the woody portion 3, as shown in FIGS. 12 and 13, the first uppermost substrate 8 and the second substrate 9 on which the LED light source 7 is arranged are located between both ends in the longitudinal direction and the end portions of the woody portion 3. A form having a vertical through hole 21 (15 mm in the longitudinal direction x 12 mm in the lateral direction) provided between the bottom surface of the recess 5 and the top surface of the second recess 6 on the lower side, FIG. As shown in FIG. 4, the length in the longitudinal direction on both sides of the first substrate 8 and the second substrate 9 of the LED light source 7 is substantially the same as the length in the first substrate 8 and the second substrate 9, and the width in the lateral direction is 3 mm. The first substrate 8 in which the LED light source 7 is arranged in the woody portion of the form A as shown in FIG. A form in which a through groove 20b in the vertical direction having a length of 80 mm in the longitudinal direction and a width of 2 mm in the lateral direction is provided on both sides of the first substrate 8 and the second substrate 9. The connection heat-dissipating member 13 to be connected to the heat-dissipating member 41 of the above was eliminated, and the upper heat-dissipating portion 40 and the lower heat-dissipating portion 41 were separately arranged on the upper side and the lower side, respectively.

As the form of the heat radiating portion 10 made of aluminum, as shown in FIG. 20 (a), for example, the form of a thin flat plate having a thickness of 1 mm and a width of 8 mm (same as the width of the substrate) is shown in Form A and FIG. 20 (b). A thin metal member that can be formed into a substantially square shape when combined with, for example, an L-shape with a thickness of 1 mm, a width of 8 mm in the lateral direction, and a length of 44 mm in the vertical direction. Form B, a thick metal member that can be formed in a substantially square shape when combined as shown in FIG. 20 (c), for example, a side surface having a thickness of 3 mm, a width of 8 mm in the lateral direction, and a width of 44 mm in the vertical direction. Form C in which two L-shaped objects are visually combined to form a square shape, as shown in FIG. 20 (d), a prismatic shape, for example, a width of 12 mm in the lateral direction and a length of the substrates 8 and 9 in the longitudinal direction. Form D of a columnar body having a quadrangular cross section with a cross section of 14 mm was used, which was set to be the same as the length in the direction and the length in the vertical direction was set to be the same as the volume of the heat radiating portion 10 of the form C. Further, although not shown, it may be in the form of a horizontal H-shape (in the case of the vertical light distribution type) or the H-shape (in the case of the left-right light distribution type) in which the heat radiating member for connection is one.

As shown in FIG. 20 (e), the blower fan 30 is a blower fan of the model F16FB-05LLC / E Copal Electronics Inc. ), The size was 16 mm × 16 mm × 4.5 mm, the voltage was DC 5 V, the flow rate was 0.012 m ³ / min, the static pressure was 5.5 Pa, and the rotation speed was 6000 rpm. As a form of arranging the blower fan 30, as shown in FIG. 6, the blower fan 30 is not installed a, and as shown in FIG. 15, two blower fans 30 are arranged in the upper part of the central region in the longitudinal direction. b, a form in which two blower fans 30 are arranged in the lower part near the vertical through holes 21 at both ends in the longitudinal direction as shown in FIG. 16, and in the upper part of the central region in the longitudinal direction as shown in FIG. A form d in which two blower fans 30 are arranged and two blower fans 30 are arranged in the lower part near the through holes 21 in the vertical direction at both ends in the longitudinal direction is used.

Regarding the light transmitting cover 4, the light transmitting cover 4 is arranged on the upper side in the first direction and the lower side in the second direction, and the light transmitting cover 4 is arranged on the upper side in the first direction and the second side. The form X in which the light transmissive cover 4 is not installed on the lower side in the direction of 1 and the form Z in which the light transmissive cover 4 is not installed on the upper side in the first direction and arranged on the lower side in the second direction are used.

The temperature measurement sensor is installed at the same position as in the first embodiment, and the substantially central portion of the first substrate 8 on which the upper LED 7 on the first direction side is arranged and the lower LED 7 on the second direction side. Was installed at a substantially central portion of the second substrate 9 in which the above-mentioned devices were arranged.

Comparative Example 1

As shown in FIG. 12, the luminaire 1 of Comparative Example 1 has a wood part 3 as a form A, an aluminum heat radiating part 10 as a form A, a blower fan 30 as a form a, and a light transmissive cover 4 as a form Y. As a result, the flow velocity of the air in the fixture body 2 was 0.007 m / s, the maximum temperature of the upper LED light source 7 was 66.01 ° C, and the maximum temperature of the lower LED light source 7 was 80. It was 59 ° C. This resulted in the LED light source 7 exceeding the allowable upper limit temperature of 70 ° C.

Comparative Example 2

As shown in FIG. 11, the luminaire 1 of Comparative Example 2 has a wood part 3 as a form B, an aluminum heat radiating part 10 as a form B, a blower fan 30 as a form a, and a light transmissive cover 4 as a form Y. As a result, the flow velocity of the air in the fixture body 2 was 0.007 m / s, the maximum temperature of the upper LED light source 7 was 64.17 ° C, and the maximum temperature of the lower LED light source 7 was 68. It was 78 ° C. In this case, the allowable upper limit temperature of the LED light source 7 was 70 ° C. or less, but the result was barely enough.

Comparative Example 3

As shown in FIG. 14, the luminaire 1 of Comparative Example 3 has a wood part 3 as a form B, an aluminum heat radiating part 10 as a form B, a blower fan 30 as a form a, and a light transmissive cover 4 as a form X. As a result, the flow velocity of the air in the fixture body 2 was 0.018 m / s, the maximum temperature of the upper LED light source 7 was 63.24 ° C, and the maximum temperature of the lower LED light source 7 was 68. It was 18 ° C. Although the form was different from that of Comparative Example 2 with and without the permeable cover 4, the air flow velocity became faster, but the maximum temperature did not change much. In this case, the allowable upper limit temperature of the LED light source 7 was 70 ° C. or less, but the result was barely enough.

Comparative Example 4

In the lighting fixture 1 of Comparative Example 4, two blower fans 30 are attached to the upper part in order to increase the flow velocity of the air near the center of the lower part, and as shown in FIG. 15, the lower air is brought to the upper part by the intake of the blower fan 30. This was carried out with the aim of equalizing the temperature inside the fixture body 2 by pulling and sending the air heated by the exhaust of the blower fan 30 to both ends. When the temperature of the wood part 3 is measured by the luminaire 1 of the form B, the aluminum heat radiating part 10 is the form B, the blower fan 30 is the form b, and the light transmissive cover 4 is the luminaire 1 of the form Y, the result is the flow velocity of the air in the instrument body 2. Was 0.008 m / s, the maximum temperature of the upper LED light source 7 was 66.72 ° C, and the maximum temperature of the lower LED light source 7 was 72.09 ° C. This resulted in the LED light source 7 exceeding the allowable upper limit temperature of 70 ° C.

In Comparative Example 4, the flow velocity of the air is almost the same as that of Comparative Example 1 or 2 in which the blower fan 30 is not installed, and the air is convected only in the central region from the center in the longitudinal direction to the vicinity of 100 mm. The temperature could not be made uniform over the entire longitudinal direction.

Comparative Example 5

In the lighting fixture 1 of Comparative Example 5, if there are air flow paths on both sides of the first substrate 8 and the second substrate 9 to which the LED light source 7 is fixed in Comparative Example 4, the air heated by convection is heated and the temperature rises. Since the temperature rise could not be suppressed because the LED light source 7 was installed at both ends of the first substrate 8 and the second substrate 9 in the longitudinal direction, as shown in FIG. Vertical through hole 21 and first substrate 8 that communicate the bottom surface, which is the deep surface of the upper first recess 5, and the top surface, which is the deep surface of the lower second recess 6, between the ends of the woody portion 3. Alternatively, vertical through grooves 20b having a length of 80 mm in the longitudinal direction and a width of 2 mm in the lateral direction are provided on both sides of the first substrate 8 and the second substrate 9 of the LED light source 7 in the central region of the second substrate 9 in the longitudinal direction. The blower fan 30 is provided below the through hole 21.

In the luminaire 1 of Comparative Example 5, when the temperature of the wood part 3 is measured by the luminaire 1 of the form C, the aluminum heat radiating part 10 is the form A, the blower fan 30 is the form c, and the light transmissive cover 4 is the luminaire 1 of the form Z, the result is as follows. The air flow velocity in the through groove 20b was 0.048 m / s, the maximum temperature of the upper LED light source 7 was 66.46 ° C, and the maximum temperature of the lower LED light source 7 was 82.11 ° C. This resulted in a large excess of the allowable upper limit temperature of 70 ° C. for the LED light source 7.

Comparative Example 6

As shown in FIG. 18, the luminaire 1 of Comparative Example 6 has a configuration in which the blower fan 30 is changed to the lower part and the light transmitting cover 4 is arranged on both the upper side and the lower side in the configuration of Comparative Example 5. In Comparative Example 6, when the temperature of the wood part 3 was measured by the luminaire 1 of the form C, the aluminum heat radiating part 10 was of the form A, the blower fan 30 was of the form b, and the light transmissive cover 4 was of the form Y, the result was the through groove 20b. The air velocity was 0.009 m / s, the maximum temperature of the upper LED light source 7 was 66.91 ° C, and the maximum temperature of the lower LED light source 7 was 83.67 ° C. This resulted in a large excess of the allowable upper limit temperature of 70 ° C. for the LED light source 7.

Comparative Example 7

As shown in FIG. 19, the luminaire 1 of Comparative Example 7 has a wood part 3 as a form C, an aluminum heat radiating part 10 as a form A, a blower fan 30 as a form d, and a light transmissive cover 4 as a form Y. As a result, the air velocity of the through groove 20b was 0.013 m / s, the maximum temperature of the upper LED light source 7 was 66.4 ° C, and the maximum temperature of the lower LED light source 7 was 81.68. It was ° C. This resulted in a large excess of the allowable upper limit temperature of 70 ° C. for the LED light source 7.

Comparative Example 8

The luminaire 1 of Comparative Example 8 had a higher heat dissipation effect when the aluminum thickness of Example 1 was 3 mm and the aluminum thickness of Comparative Example 2 was 1 mm. Then, it was tested whether the same effect could be obtained even if the form of the heat radiating unit 10 was different. In Comparative Example 8, when the temperature of the wood part 3 was measured by the lighting fixture 1 of the form D, the aluminum heat radiating portion 10 of the form D, the blower fan 30 of the form d, and the light transmissive cover 4 of the form Y, the result was the fixture main body 2. The flow velocity of the air inside was 0.013 m / s, the maximum temperature of the upper LED light source 7 was 60.8 ° C, and the maximum temperature of the lower LED light source 7 was 63.1 ° C. This resulted in a temperature lower than the allowable upper limit temperature of 70 ° C. of the LED light source 7.

In addition, the temperature storage, heat transfer, and heat dissipation conditions of Example 1 and Comparative Example 8 were compared. The temperature distribution in the case of Example 1 is shown in FIG. 9, and the temperature distribution in the case of Comparative Example 8 having the same volume as that of Example 1 is shown in FIG. In FIG. 9 or FIG. 10, it is shown that the range having the same density has the same temperature distribution.

As a result, in the temperature distribution of Example 1, the vicinity of the upper first substrate 8 and the vicinity of the lower second substrate 9 belong to the same temperature range, and the lower temperature is transferred to the upper side as a whole. It was also shown that the temperature rise was suppressed. On the other hand, the temperature distribution of Comparative Example 8 is in a different temperature range from the vicinity of the upper first substrate 8 and the vicinity of the lower second substrate 9, and the vicinity of the lower second substrate 9 is larger than the vicinity of the upper first substrate 8. It was shown that the temperature range was high, and the result was obtained that the lower LED light source 7, which generates a large amount of heat, could not dissipate heat. Therefore, it was clarified that even in the heat radiating unit 10 made of aluminum having the same volume, it is possible to make the heat source more uniform by connecting the heat source of the upper LED light source 7 having a small heat generation amount and the heat source of the lower LED light source 7 having a large heat generation amount. ..

As a summary of the above results, the morphology of the woody portion 3 of Examples 1 and Comparative Examples 1 to 8, the morphology of the aluminum radiating portion 10, the morphology of the blower fan 30, and the morphology of the light transmissive cover 4 in each case. Table 1 shows the air flow velocity and the maximum temperatures of the upper LED 7 and the lower LED 7.

From Table 1, the effect of increasing the temperature of the LED light source 7 could not be expected even if the flow velocity of the air in the appliance body 2 increased, and the aluminum heat dissipation part 10 was placed on the upper first substrate 8 and the lower second substrate. The one in which the shape of the aluminum heat radiating part 10 is substantially square in the lateral direction of the wood part 3 connected to 9 is the most effective for radiating heat, and the volume of the aluminum radiating part 10 is increased. However, it was revealed that the heat diffusion of the heat generated by the LED light source 7 is large. Then, in Example 1 in which the thickness of the aluminum heat radiating portion 10 of the present invention is increased to increase the contact area between the radiating portion 10 and the woody portion 3, the temperatures of the lower LED light source 7 and the upper LED light source 7 are increased. The remarkable effect of being able to suppress the above was obtained.

Next, an experimental aircraft was prototyped to compare the temperature of the housing between the configuration of Comparative Example 1 which is a conventional embodiment and the configuration of Example 1 of the present invention. In the experimental method, the experimental machines of Comparative Example 1 and Example 1 were installed in a constant temperature bath, the upper and lower LED light sources for heat generation were turned on, and the changes over time in the vicinity of the upper and lower LED light sources and the ambient temperature of the experimental machine were thermocoupled. Pairs were used for plotting and comparison. The results are shown in FIG. 21 (a) for the case of Comparative Example 1 and in FIG. 21 (b) for the case of Example 1. Table 2 shows the voltages, currents, and electric powers of the upper LED light source and the lower LED light source, and the measured temperatures for each measurement site, which were carried out at that time. Also, due to the convenience of handling, the experimental aircraft is shorter than the actual product model used in the analysis. Therefore, the input power of the LED is adjusted to the same calorific value as the actual product model according to the length of the experimental aircraft. The measurement shown in FIG. 21 was performed with the luminaire 1 having a form in which the first direction is upward and the second direction is downward.

The measured temperature C or G in FIGS. 21A or 21B indicates the change in the outside air temperature in the vicinity of the instrument body 2 which is the housing, and the measured temperature a or D is the change in the temperature at the lateral end of the bottom surface of the housing. The measured temperature (b) or (f) indicates the change in the temperature in the lateral center of the upper surface of the housing, and the measurement temperature (e) indicates the change in the temperature in the lateral center of the bottom of the housing. In Table 2, "-" means that the measurement was not performed.

From FIGS. 21 (a) and 21 (b) and Table 2, the measurement temperature of Comparative Example 1 of the conventional structure increased to 112.1 ° C. at the maximum value, whereas that of Example 1 of the present invention was the maximum measurement temperature. The value was 62.95 ° C., which was lower than the allowable upper limit temperature of 70 ° C. for the LED light source. Further, the outside air temperature around the housing is 21.1 ° C. in Comparative Example 1 and 27.6 ° C. in Example 1. Therefore, in the case of the configuration of Example 1, heat dissipation made of aluminum is used. It can be seen that the heat generated by the LED light source 7 is transferred to the part 10, the heat of the aluminum heat radiating part 10 is transferred to the wood part 3, and the heat of the wood part 3 is transferred to the outside air.

Next, in the configuration of the aluminum heat-dissipating portion 10 of the first embodiment of the present invention having the above-described form C and the configuration of the aluminum-made heat-dissipating unit 10 of the comparative example 8 having the above-described form D, the upper LED light source 7 The temperature was measured by changing the output ratio between the lower LED light source 7 and the lower LED light source 7. The results are shown in Table 3.

The output ratio when Example 1 and Comparative Examples 1 to 8 were as follows: Since the calorific value of the lower lower LED light source that distributes light downward was 0.155 W / piece and 144 pieces were arranged and the temperature was measured with the total calorific value of 22.32 W, "upper LED output: lower LED output = 1". : 1.55 ”indicates the output ratio when Example 1 and Comparative Examples 1 to 8 are carried out.

The effect of changing the output ratio between the upper LED output and the lower LED output was confirmed. As a case, change the output ratio between the upper LED output and the lower LED output as "upper LED output: lower LED output = 1: 9, 1: 4, 1: 1.55, 1: 1, 1.55: 1". Then, the temperature was measured with "non-lighting: lighting". The outside air temperature at this time was 25 ° C. In Table 3, "-" in the column above the LED means that the upper LED was not turned on, and "-" in the output ratio column means that the upper LED was not turned on, so the ratio could not be obtained. The "-" above the LED of the measurement temperature means that the upper LED was not turned on and therefore the measurement was not performed.

From Table 3, even if the output ratio between the upper LED output and the lower LED output is greatly changed, the configuration of Example 1 of the present invention has almost no difference in temperature distribution from the configuration of Comparative Example 8 and is above and below. It has been shown that the temperature difference between the upper and lower heat radiating portions 10 made of connected aluminum is small. On the other hand, in the case of the configuration of Comparative Example 8 which is a square bar type, it is shown that the temperature difference between the upper and lower aluminum heat radiating portions is large.

Therefore, in the lighting fixture 1 of the present invention, the temperature rise due to the heat generated by the upper and lower LED light sources 7 is averaged by the substantially square-shaped aluminum heat radiating portion 10 in the lateral view of the woody portion 3 (equipment main body 2). It is shown that the temperature rise is suppressed, and the temperature rise is diffused to the upper and lower heat radiating parts 10 and the temperature is averaged in the heat radiating parts 10, so that the wooden part 3 which is a wooden frame is covered. It was shown that the thermal effect was also reduced.

1 Lighting equipment 2 Equipment body 3 Wood part 4a First light transmissive cover 4b Second light transmissive cover 5 First recess 6 Second recess 7 LED light source 8 First board 9 Second board 10 Heat dissipation part 11 First heat radiation member 12 Second heat radiation member 13 Connection heat radiation member 20 Through groove 21 Through hole 22 Step 23 Groove 24 Deep surface 25 Deep surface 30 Blower fan 31 Intake 32 Exhaust 40 First heat radiation unit 41 Second heat radiation unit K Air

Claims (4)

A lighting fixture in which an opening is not exposed on the entire outer surface of the fixture body in which the entire outer surface is formed of a substantially columnar wood part and a light-transmitting cover.
The instrument body includes a wooden portion having a long first recess having an opening formed in the first direction, a long second recess having an opening formed in the second direction, and the first recess. It has a first light transmissive cover that covers the opening of one recess and a second light transmissive cover that covers the opening of the second recess.
A first substrate in which a plurality of LED light sources that distribute light only in the first direction are arranged at predetermined intervals, which are arranged in the deep part of the first recess.
A second substrate in which a plurality of LED light sources that distribute light only in the second direction are arranged at predetermined intervals, which is arranged in the deep part of the second recess, is provided.
The first heat radiating member fixed to the deep surface of the first recess of the wood part in a state of being sandwiched between the first substrate and the wood part, and the second of the wood part in a state of being sandwiched between the second substrate and the wood part. The first dissipating member fixed to the deep surface of the recess and inserted into a narrow through groove that communicates the deep surface of the first recess and the deep surface of the second recess. (1) A lighting fixture provided with a heat-dissipating portion made of metal having a heat-dissipating member and a connecting heat-dissipating member connected to the second heat-dissipating member. The luminaire according to claim 1, wherein the shape of the heat radiating portion is a substantially square shape or a substantially H shape lying down in a cross section in the lateral direction of the xylem. The luminaire according to claim 1 or 2, wherein the thickness of the heat radiating member for connection and the width in the lateral direction of the narrow through groove are substantially the same length. The lighting fixture according to any one of claims 1 to 3, wherein the wood part is a solid long material.

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