WO2020079740A1

WO2020079740A1 - Led illumination head

Info

Publication number: WO2020079740A1
Application number: PCT/JP2018/038395
Authority: WO
Inventors: 玄寺尾; 重実毛利; 周小久保
Original assignee: バルミューダ株式会社
Priority date: 2018-10-16
Filing date: 2018-10-16
Publication date: 2020-04-23
Also published as: KR20210075908A; JP6674069B1; JPWO2020079740A1; KR102551036B1

Abstract

Provided is an LED illumination head provided with a plurality of LED light sources, wherein a degree of freedom in the arrangement of the LED light sources is ensured without blocking the optical path of a light source system, while ensuring thermal emission properties. A reflection plate (4) has a reflection surface (4a) that reflects light emitted from an LED light source (5a), a reflection surface (4b) that reflects light emitted from an LED light source (5b), and a reflection surface (4c) that reflects light emitted from an LED light source (5c). A base frame (2) has an attachment part (2b) to which the LED light source (5a) arranged opposing the reflection surface (4a) is attached, the base frame (2) extending from the attachment part (2b) through the reflection plate (4) to reach the rear surface of the reflection plate (4). A ring frame (3) is arranged so as to surround the periphery of the reflection plate (4), and the LED light sources (5b), (5c) arranged opposing the reflection surfaces (4b), (4c) are attached to the ring frame (3).

Description

LED lighting head

The present invention relates to an LED lighting head, and more particularly to a heat dissipation structure for a plurality of LED light sources arranged at different positions.

Conventionally, in an LED lighting head using LEDs (light emitting diodes) as a light source, a heat dissipation structure that dissipates heat generated by a plurality of LED light sources is known. For example, Patent Document 1 discloses a lamp 20 in which two LED light sources 23 having different emission directions are attached to a single LED carrier 22 arranged in the front center of a reflector 21 as shown in FIG. ing. The LED carrier 22 extends horizontally, a cooling fin 22a is provided in the center thereof, and two LED light sources 23 are attached to both ends thereof. The reflecting plate 21 is provided with two reflecting surfaces that reflect the light emitted from the respective LED light sources 23. The radiating fins 22a included in the LED carrier 22 directly radiate the heat generated by each LED light source 23, and thus function as a radiating member completed by the LED carrier 22 itself.

Further, Patent Document 2 discloses a light emitting device 30 in which, as shown in FIG. 7, two LED light sources 33 having different emission directions are attached to a single substrate supporting plate 32 arranged in the center of a housing 31. Has been done. The board support plate 32 is erected upward from the center of the housing 31, and the LED light sources 33 are attached to the left and right side surfaces of the board support plate 32, respectively. The housing 31 is provided with two reflecting surfaces that reflect the light emitted from the respective LED light sources 33. The substrate support plate 32, which is a common mounting member for the two LED light sources 33, extends vertically through the housing 31 to reach the back surface of the housing 31, and the radiation fins 34 or the high thermal conductivity member provided on the back surface. Is in contact with. As a result, the heat generated by the two LED light sources 33 is guided not only to the substrate support plate 32 but also to the back surface of the housing 31 via the substrate support plate 32, and is also radiated by the heat radiation fins 34 and the like.

Japanese Patent Publication No. 2014-511017 JP, 2007-300138, A

In the above-mentioned

Patent Documents

1 and 2, a plurality of LED light sources are mounted on a single mounting member (LED carrier or substrate support plate), and the mounting members are used as a common heat dissipation member to dissipate heat from the plurality of LED light sources. It is something to do. Therefore, the location of the LED light source is naturally limited in the vicinity of the mounting member, for example, both ends of the LED carrier in Patent Document 1 or both side surfaces of the substrate support plate in Patent Document 2, and the location of the LED light source is limited. Low degree of freedom in placement. Further, if a plurality of LED light sources are arranged apart from each other on a common mounting member, the mounting member located in front of the reflector becomes large and the light path of the light source system is blocked.

Therefore, an object of the present invention is to secure the flexibility of the arrangement of the LED light sources without blocking the optical path of the light source system while ensuring the heat dissipation in the LED lighting head having a plurality of LED light sources.

In order to solve such a problem, the present invention provides an LED lighting head using a plurality of LED light sources. This LED lighting head includes a reflector, a first LED light source, a second LED light source, a first reflecting surface, a second reflecting surface, a first heat dissipation member, and a second heat dissipation member. Have and. The first LED light source is arranged inside the edge of the reflector. The second LED light source is arranged at a position different from that of the first LED light source. The first reflecting surface is provided on the reflecting plate and reflects the light emitted from the first LED light source. The second reflecting surface is provided on the reflecting plate and reflects the light emitted from the second LED light source. The first heat radiation member has a mounting portion to which the first LED light source is mounted, and penetrates the reflection plate from the mounting portion to reach the back surface of the reflection plate. The second heat radiation member is provided separately from the first heat radiation member, and the second LED light source is attached to the second heat radiation member.

Here, in the present invention, it is preferable that the second LED light source is arranged near an edge portion of the reflection plate, and the second heat radiation member is arranged so as to surround the periphery of the reflection plate. . Moreover, you may provide a 3rd LED light source and a 3rd reflective surface. The third LED light source is attached to the second heat dissipation member. The third reflecting surface is provided on the reflecting plate and reflects the light emitted from the third LED light source. In this case, the third LED light source may be arranged side by side with the second LED light source.

In the present invention, the first heat radiating member is bent with respect to a portion that linearly extends through the front and back surfaces of the reflector, and the first LED light source is mounted on the bent portion. Is preferred. Further, the reflector may be configured by combining a plurality of members divided for each reflecting surface. Further, it is preferable that the second heat dissipation member is connected to the first heat dissipation member on the back surface of the reflection plate and is integrated as a frame of the LED lighting head. In this case, it is desirable that the reflector is held within the frame.

According to the present invention, the first LED light source arranged inside the edge of the reflection plate is attached to the first heat dissipation member that penetrates the front and back of the reflection plate, and is located at a position different from the first LED light source. The arranged second LED light source is attached to the second heat radiation member provided separately from the first heat radiation member. In this way, by disposing the heat dissipating members exposed in front of the reflector for the first LED light source and the second LED light source, even if the LED light sources are arranged apart, the exposure of the heat dissipating member can be minimized. . As a result, it is possible to arrange a plurality of LED light sources with a high degree of freedom, without interrupting the optical path of the light source system while ensuring heat dissipation.

Exterior perspective view of lighting head Development perspective view of lighting head Top view of lighting head Sectional view taken along the line AA of FIG. BB cross section of FIG. Illustration of conventional technology Illustration of conventional technology

FIG. 1 is an external perspective view of the lighting head according to the present embodiment. The lighting head 1 is used as a part of various lighting fixtures including a stand type and a hanging type. The lighting head 1 has a plurality of LED light sources built therein, and is mainly composed of a base frame 2, a ring frame 3, and a reflector 4. These

frames

2 and 3 are connected to each other on the back surface of the lighting head 1 and are integrated as a frame forming a strong structure. The

frames

2 and 3 are also used as heat dissipation members for dissipating heat generated by the plurality of LED light sources. The reflector 4 is held in the frame of the integrated

frames

2 and 3.

FIG. 2 is an exploded perspective view of the lighting head 1. The base frame 2 is provided above the reflection plate 4 (on the back side) and substantially in the center of the reflection plate 4. The base frame 2 is formed of a metal material having excellent thermal conductivity, such as an aluminum material, an aluminum material having a black anodized surface, or a copper material. Further, instead of such a metal material, a non-metal material having excellent thermal conductivity, for example, a carbon material or a composite material thereof may be used.

The base frame 2 is mainly composed of a square tubular base portion 2a, and a mounting portion 2b and an arm portion 2c are provided at the lower end thereof. The base 2a is attached to another member that constitutes the lighting device. The mounting portion 2b projects downward from the lower end of the linearly extending base portion 2a, and its tip is bent laterally (including diagonal sideways), and on the bent portion, The LED light source 5a is installed. The installation location of the LED light source 5a is not necessarily limited to the tip of the mounting portion 2b, and any installation location is possible as long as it can irradiate the reflector 4 with light. A screw hole is provided in this bent portion, and the reflection plate 4 is attached by inserting a screw into this screw hole. The arm portion 2c is provided on the lower end of the base portion 2a on the side opposite to the attachment portion 2b, and extends laterally. The tip of the arm portion 2c is provided with a plurality of screw holes, and the ring frame 3 and the reflection plate 4 are attached by inserting attachment screws into these screw holes.

The ring frame 3 is provided around the reflector 4. The ring frame 3 is made of a metal material or a non-metal material having excellent thermal conductivity, as exemplified as the material of the base frame 2. The ring frame 3 has a ring shape surrounding the periphery of the reflection plate 4, and a part of the ring frame 3 extends toward the inside (center side) to form the attachment portion 3a. A part of the mounting portion 3a is depressed downward, and two LED light sources 5b and 5c apart from the LED light source 5a are installed side by side on the upper surface of the depressed portion. The reason why a part of the mounting portion 3a is depressed is to secure a space between the LED light sources 5b and 5c and the reflection plate 4. Further, the ring frame 3 is provided with a plurality of screw holes at appropriate positions, and the base 2 and the reflection plate 4 are attached by inserting attachment screws into these screw holes.

The reflector 4 is integrally formed of, for example, a resin material. A plurality of mirror-plated reflecting surfaces 4a-4c are individually formed on the reflecting plate 4 corresponding to the LED light sources 5a-5c. Further, the reflecting plate 4 is provided with a through hole 4d having an opening shape capable of inserting the mounting portion 2b of the base frame 2. The reflector 4 may not be integrally formed, but may be configured by combining a plurality of members divided for each reflecting surface.

Each of the LED light sources 5a to 5c is composed of a single LED (light emitting diode) or a light emitting unit in which an LED group is mounted on a substrate. The LEDs mounted on the individual light emitting units have a common directivity and emit light in a specific direction as one light source. In the present specification, the “LED light source” is a light source that includes at least one LED and emits light in a specific direction as one light source.

When assembling the lighting head 1, first, arrange the reflector 4 on the ring frame 3 and then fix them with screws. Next, while inserting the mounting portion 2b into the through hole 4d, the base frame 2 is arranged on the reflection plate 4, and then these are fixed with screws. As a result, the reflection plate 4 is held in the frame of the

frames

2 and 3 and integrated as the illumination head 1.

FIG. 3 is a plan view of the lighting head 1. When the vertical direction of the figure is the front-back direction of the reflection plate 4, three reflection surfaces 4a to 4c are alternately arranged in the front-back direction on the reflection plate 4. The three LED light sources 5a to 5c face the reflecting plate 4 with a predetermined space in the front-back direction of the paper surface shown in the drawing, and are arranged corresponding to the respective reflecting surfaces 4a to 4c.

Specifically, the reflecting surface 4a is located in the front center of the reflecting plate 4, and is formed in a substantially circular shape in the plan view of FIG. An LED light source 5a is arranged near the rear end of the reflecting surface 4a. The LED light source 5a is attached to the mounting portion 2b exposed on the side of the reflecting plate 4 where the reflecting surfaces 4a to 4c are formed, and is located inside the edge of the reflecting plate 4, more specifically, on the reflecting plate 4. It is located approximately in the center. The light emitted from the LED light source 5a is reflected according to the curved surface shape of the reflection surface 4a at the front center. This reflected light is applied to the irradiation surface through a diffusion plate (not shown) or the like, and thereby an irradiation area (high brightness area formed on the irradiation surface) derived from the LED light source 5a is formed.

The reflecting surface 4b is located on the left rear side of the reflecting plate 4, and has a substantially elliptical beam shape in which the upper right portion overlapping with the reflecting surface 4a is cut out in the plan view of FIG. The upper right portion, that is, the boundary portion 4e between the reflecting surfaces 4a and 4b is a discontinuous step due to the difference in curved surface shape between the two. The LED light source 5b is arranged near the rear end of the reflecting surface 4b, apart from the LED light source 5a. The LED light source 5b is attached to the exposed mounting portion 3a so as to face the front surface side of the reflection plate 4 (the formation surface side of the reflection surfaces 4a to 4c), and is located near the center of the reflection plate 4. It is located on the outer side, more specifically, near the edge of the reflection plate 4. The light emitted from the LED light source 5b is reflected according to the curved shape of the left rear reflecting surface 4b. This reflected light is irradiated onto the irradiation surface through a diffusion plate or the like, and thereby an irradiation area derived from the LED light source 5b is formed.

The reflecting surface 4c is located on the right rear side of the reflecting plate 4, and has a substantially elliptical beam shape in which the upper left portion overlapping the reflecting surface 4a is cut out in the plan view of FIG. The upper left portion, that is, the boundary portion 4f between the reflecting surfaces 4a and 4c is a discontinuous step due to the difference in curved surface shape between the two. Further, an LED light source 5c is arranged near the rear end of the reflecting surface 4c, apart from the LED light sources 5a and 5b. The LED light source 5b is attached to the exposed mounting portion 3a so as to face the front surface side of the reflection plate 4 (the formation surface side of the reflection surfaces 4a to 4c), and is located near the center of the reflection plate 4. It is located on the outer side, more specifically, in the vicinity of the edge of the reflection plate 4 side by side with the LED light source 5b. The light emitted from the LED light source 5c is reflected according to the curved surface shape of the reflection surface 4c on the right rear side. This reflected light is irradiated onto the irradiation surface through a diffuser plate or the like, thereby forming an irradiation region derived from the LED light source 5c.

The irradiation areas of the LED light sources 5a to 5c are formed so as to overlap each other on the irradiation surface. However, this is an example, and the irradiation regions of the LED light sources 5a to 5c may be formed so as to partially overlap with each other, or may be formed individually at different positions on the irradiation surface. What kind of irradiation area is formed is determined by the arrangement and shape of the reflecting surfaces 4a to 4c, the arrangement of the LED light sources 5a to 5c, etc., depending on the purpose of use of the illumination head 1.

FIG. 4 is a sectional view taken along line AA of FIG. The base frame 2 arranged substantially in the center of the reflection plate 4 extends from the mounting portion 2b through the through hole 4d of the reflection plate 4 to the back surface of the reflection plate 4. The bent portion of the mounting portion 2b extends so as to slightly enter the reflection surface 4a side so as to face the reflection surface 4a, and the LED light source 5a is mounted on the upper surface so as to face the reflection surface 4a. ing. When the user looks at the illumination head 1 from below, the LED light source 5a is covered with the mounting portion 2b, and therefore the light of the LED light source 5a does not directly enter the eyes of the user.

The heat generated by the LED light source 5 a located inside the edge of the reflector 4 is guided to the back surface of the reflector 4 according to the shape of the base frame 2. Since the optical path of the optical system in the illumination head 1 does not exist on the back surface of the reflection plate 4, the surface area required for heat dissipation of the LED light source 5a can be secured with a high degree of freedom on the back surface side without inviting the blocking of the optical path. At that time, if necessary, a radiation fin for radiating the heat transferred to the base frame 2 may be provided on the back surface of the reflection plate 4. Such a configuration is advantageous in that the heat radiation member (mounting portion 2b) exposed in front of the reflection plate 4 can be minimized as compared with the configuration in which heat radiation is completed in front of the reflection plate 4.

FIG. 5 is a sectional view taken along line BB of FIG. In the ring frame 3 arranged around the reflection plate 4, the mounting portion 3a extends so as to slightly enter the reflection surface 4b side so as to face the reflection surface 4b, and the reflection plate 4b is provided on the upper surface thereof. The LED light source 5b is attached so as to face. When the user looks at the illumination head 1 from below, the LED light source 5b is covered with the mounting portion 3a, so that the light of the LED light source 5b does not directly enter the eyes of the user.

The heat generated by the LED light source 5b located near the edge of the reflection plate 4 is radiated mainly by the ring frame 3 arranged around the reflection plate 4. Since the optical path of the optical system in the illumination head 1 does not exist around the reflection plate 4, the surface area required for heat dissipation of the LED light source 5b is provided on the outer peripheral side of the reflection plate 4 with a high degree of freedom without inviting interruption of the optical path. Can be secured. At that time, if necessary, a radiation fin or the like may be provided around the reflection plate 4 to radiate the heat transferred to the ring frame 3.

Also, the LED light source 5c arranged side by side with the LED light source 5b on the mounting portion 3a is also radiated by the same mechanism as the LED light source 5b.

Thus, according to the present embodiment, the LED light source 5a arranged inside the edge of the reflector 4 is attached to the base frame 2 that penetrates the front and back of the reflector 4. The heat generated by the LED light source 5a is radiated mainly by the base frame 2. Since the base frame 2 penetrates the reflection plate 4 and reaches the back side, the surface area required for heat dissipation can be secured on the back side of the reflection plate 4 without blocking the optical path of the optical system provided in the illumination head 1. The LED light sources 5b and 5c arranged at positions different from the LED light source 5a are attached to the ring frame 3 which is separated from the base frame 2. The heat generated by the LED light sources 5b and 5c is radiated mainly by the ring frame 3. Since the ring frame 3 is provided so as to surround the periphery of the reflection plate 4, a surface area required for heat dissipation can be secured around the reflection plate 4. As a result, even if the LED light sources 5a to 5c are arranged apart from each other, the exposure of the

frames

2 and 3 in front of the reflection plate 4 can be minimized, sufficient heat dissipation can be ensured, and the LED light sources 5a to 5c can be freely moved. It becomes possible to arrange in degrees.

Further, according to the present embodiment, the base frame 2 and the ring frame 3 are also used as the heat radiating member, and both are connected and integrated on the back surface of the reflection plate 4, whereby the strength of the illumination head 1 is improved. Can be planned. In particular, if the reflecting plate 4 is held in the frame of these

frames

2 and 3, it is possible to effectively prevent the reflecting plate 4 from being damaged due to a drop or the like.

In addition, in the above-described embodiment, the example in which the ring frame 3 is used as a heat dissipation member different from the heat dissipation member (base frame 2) for the LED light source 5a that penetrates the front and back of the reflection plate 4 has been described. When the location of the LED light sources 5b and 5c is near the edge of the reflection plate 4, the ring frame 3 disposed around the reflection plate 4 is a preferable example as a heat dissipation member of the LED light sources 5b and 5c. The invention is not limited to this, and any heat dissipation member (not necessarily a frame) can be used depending on the design of the lighting head 1. For example, if the LED light sources 5b and 5c are arranged inside the edge of the reflection plate 4, and if there is a concern that the light of the light source system is blocked by the heat radiation by the ring frame 3, the front and back of the reflection plate 4 may be shielded. It is also possible to provide a heat radiating member penetrating the LED separate from the heat radiating member (base frame 2) for the LED light source 5a, and attach the LED light sources 5b and 5c to the tip thereof. At that time, if the LED light sources 5b and 5c are separated from each other, a heat radiating member may be separately provided for each of the LED light sources 5b and 5c.

Furthermore, in the above-described embodiment, an example in which the three LED light sources 5a to 5c are used as the illumination head 1 has been described, but the present invention is based on at least the LED light source 5a arranged inside the edge of the reflection plate 4. , And two LED light sources (for example, 5b) arranged at different positions. Therefore, the third LED light source (for example, 5c) is not essential, or an LED light source may be further added in addition to the LED light sources 5a to 5c.

1 Lighting Head 2 Base Frame 2a Base 2b Attachment 2c Arm 3 Ring Frame 3a Attachment 4 Reflector 4a-4c Reflective Surface 4d Through Holes 4e, 4f Boundary 5a-5c LED Light Source

Claims

In an LED lighting head using a plurality of LED light sources,
A reflector,
A first LED light source arranged inside the edge of the reflector,
A second LED light source arranged at a position different from that of the first LED light source;
A first reflecting surface which is provided on the reflecting plate and reflects light emitted from the first LED light source;
A second reflecting surface which is provided on the reflecting plate and reflects light emitted from the second LED light source;
A first heat dissipation member having a mounting portion to which the first LED light source is mounted, and penetrating the reflecting plate from the mounting portion to the back surface of the reflecting plate;
An LED lighting head, comprising: a second heat radiation member which is provided separately from the first heat radiation member and to which the second LED light source is attached.
The second LED light source is arranged near the edge of the reflector,
The LED lighting head according to claim 1, wherein the second heat dissipation member is disposed so as to surround the periphery of the reflection plate.
A third LED light source attached to the second heat dissipation member,
The LED lighting head according to claim 2, further comprising: a third reflection surface provided on the reflection plate and configured to reflect light emitted from the third LED light source.
The LED lighting head according to claim 3, wherein the third LED light source is arranged side by side with the second LED light source.
The first heat radiating member is bent with respect to a portion that linearly extends through the front and back of the reflector, and the first LED light source is mounted on the bent portion. The LED lighting head according to claim 1 or 2, characterized in that.
The LED lighting head according to claim 1 or 2, wherein the reflecting plate is configured by combining a plurality of members divided for each of the reflecting surfaces.
The said 2nd heat dissipation member is connected with the said 1st heat dissipation member in the back surface of the said reflective plate, and is integrated as a frame of the said LED lighting head, It is characterized by the above-mentioned. LED lighting head.
The LED lighting head according to claim 7, wherein the reflector is held within the frame of the frame.