WO2011074424A1

WO2011074424A1 - Reflective illumination device

Info

Publication number: WO2011074424A1
Application number: PCT/JP2010/071596
Authority: WO
Inventors: 賢治米田; 満斎藤
Original assignee: シーシーエス株式会社
Priority date: 2009-12-18
Filing date: 2010-12-02
Publication date: 2011-06-23
Also published as: JPWO2011074424A1; TW201135146A

Abstract

Provided is a reflective illumination device wherein even if one end of a heat conduction member is secured to a substrate, and the other end is directly secured to a reflecting mirror, the position or the orientation of an LED can be finely adjusted, the heat release efficiency of heat generated in the LED can be improved, and high-intensity light at the center of light emitted from the LED can be effectively used. A reflective illumination device (100) is provided with a reflecting mirror (1) on which a reflective surface (11) is formed so as to define a concavity on the upper side, a substrate (4) provided so as to be opposite to the center portion (12) of the reflective surface (11), and a LED (3) for emitting light toward the reflective surface (11). Rod-like heat conduction members (5) wherein one end is secured to the substrate (4) and the other end is secured to the reflecting mirror (1) so that the substrate (4) and a heat release structure (2) are thermally connected, are radially extended from the substrate (4) to the outer edge (13) of the reflecting mirror (1).

Description

Reflective lighting device

The present invention relates to a reflective illumination device that can be suitably used not only for medical purposes such as surgery but also in an exhibition hall or a theater.

This type of reflective illumination device illuminates a predetermined area by once reflecting light from a light source with a reflecting mirror. For example, a halogen lamp or a mercury lamp is used as the light source, but in recent years, a lamp using an LED has been developed.

By the way, a large light quantity LED called a power LED is used for an application that requires a large quantity of light in such a reflective illumination device. When a large amount of power LED is used, heat generation from the LED increases correspondingly, and it is necessary to provide a heat dissipation mechanism in order to prevent failure due to the heat.

The inventors of the present application have already applied for such a reflective illumination device having a heat dissipation structure that can dissipate the heat generated by the LED without largely blocking the light reflected by the reflecting mirror. Specifically, as shown in FIG. 11, this includes a concave mirror 1A, a heat radiation mechanism 2A attached to the back side of the concave mirror 1, an LED 3A provided so as to face the concave mirror 1A, and the heat radiation structure 2A. And a heat pipe 5A that connects the substrate 4A on which the LED 3A is placed through the central portion 12A of the concave mirror 1A, and the heat dissipation structure 2A is not provided on the LED 3A side. In addition, on the concave mirror 1A side, the heat dissipation structure 2A is provided by projecting from the back side of the concave mirror 1A to the opposite side of the substrate 4A, so that the LED can be radiated without blocking the reflected light (patent). Reference 1).

Furthermore, Patent Document 1 also discloses a position adjustment mechanism 6A that adjusts the distance between the concave mirror 1A and the LED 3A in order to change the illumination range. Specifically, as shown in FIG. 7, a connecting portion 6A for connecting the concave mirror 1A and the heat radiating member 2A includes a first connecting member 61A provided on the concave mirror 1A side and a first connecting member 61A provided on the heat radiating member 2A side. The second connecting member 62A is slidably fitted to the first connecting member 61A, and the LED 3A is reflected by being fastened with a screw at a predetermined position. It is configured to be movable back and forth with respect to the surface 11A.

However, since this has the heat dissipation structure 2A protruding from the back side of the concave mirror 1A, for example, when it is desired to attach the reflective illumination device to a ceiling or the like, the heat dissipation structure 2A becomes an obstacle. Therefore, as shown in FIG. 12, it is conceivable to remove the heat dissipation structure 2A and directly attach the heat pipe 5A to the concave mirror 1A. In this case, the end of the heat pipe 5A is screwed to the substrate 4A and the concave mirror 1A. If it is fixed by such point contact, the heat generated by the LED 3A cannot be sufficiently conducted to the concave mirror 1A. Therefore, it is necessary to fix it to the substrate so as to ensure surface contact by welding or press fitting. There is. Then, since both ends of the heat pipe 5A are completely fixed to the substrate 4A and the concave mirror 1A, the position of the substrate 4A cannot be changed, and the direction and position of the LED 3A can be finely adjusted, The illumination range cannot be changed.

Further, in the reflective illumination device 100A as shown in FIG. 7, the position adjusting mechanism is provided between the concave mirror 1A and the heat dissipation structure 2A in order to provide a function of adjusting the distance between the LED 3A and the concave mirror 1A. Since 6A is interposed, the distance for transferring heat from the LED 1A to the heat dissipation mechanism 2A becomes long, and it is difficult to improve the heat dissipation efficiency.

In addition, since the heat pipe 5A passes through the central portion 12A of the concave mirror 1A and is connected to the heat dissipation mechanism 2A, the center of the light emitted from the LED 3A and reaching the concave mirror 1A. The intense light of the part is blocked by the heat pipe 5A and cannot reach the reflecting surface, and is wasted, and the light quantity of the entire reflective illumination device 100A is impaired.

JP 2008-108721 A

The present invention has been made in view of the above-described problems. Even if one end of the heat conducting member is fixed to the substrate and the other end is directly fixed to the reflecting mirror, the position and orientation of the LED can be finely adjusted. It is an object of the present invention to provide a reflective illumination device that can improve the heat dissipation efficiency of heat generated in an LED and can effectively use high intensity light emitted from the LED at the center. To do.

That is, the reflective illumination device of the present invention is attached to the substrate, a reflecting mirror having a concave reflecting surface formed on the front side, a substrate provided to face the central portion of the reflecting surface, and the substrate. An LED that emits light toward the reflecting surface, one end of which is fixed to the substrate and the other end is fixed to the reflecting mirror, and the substrate and the reflecting mirror A rod-like heat conducting member for thermally connecting the electrodes is provided radially from the substrate to the outer edge of the reflecting mirror.

If it is such, since the said heat conductive member is a rod-shaped thing and is provided radially from the said board | substrate to the outer edge part of the said reflective mirror, the both ends of the said heat conductive member are the said board | substrate and the said reflection. Even if it is fixed to the mirror, it is possible to bend the heat conducting member that is attached obliquely when viewed from the substrate, so that the position and orientation of the LED can be finely adjusted by the deflection. It becomes possible.

Further, since the heat conducting member is fixed to the reflecting mirror itself, it is possible to dissipate heat from the reflecting mirror itself. Therefore, unlike the conventional case, it is not necessary to provide a heat radiating structure by greatly projecting along the optical axis from the back side of the reflecting mirror, and it is possible to eliminate the heat radiating structure or to reduce its size. As a result, since restrictions on heat dissipation are weakened, the degree of freedom of forming the back surface of the reflecting mirror on a substantially flat surface is increased, and it becomes easy to attach the reflective illumination device to a flat surface such as a ceiling.

Furthermore, since the substrate and the reflecting mirror are directly connected by the heat conducting member, the distance for transferring heat can be reduced as compared with the conventional case, so that the heat radiation efficiency can be further improved.

In addition, there is no need to attach the heat conducting member to the central part of the reflecting surface or to provide a hole for insertion, and the strong light at the central part emitted from the LED is reflected without wasting it. Will be able to. Further, since the heat transfer member is not provided so as to pass through the central portion of the reflecting surface, one end is provided at the outer edge of the reflecting mirror, so that the light emitted from the LED is blocked by the heat conducting member. And almost all light can reach the reflecting surface. Further, since the heat conducting member is a rod-shaped member that is provided radially from the substrate to the outer edge of the reflecting mirror, the LED and the substrate are supported even if the diameter thereof is smaller than the conventional one. In addition, the light reflected on the reflecting surface can be hardly blocked. Accordingly, it is possible to further improve the amount of light emitted from the reflection type illumination device irradiated from the reflection surface.

In order to further enhance the heat dissipation effect, it is sufficient if a heat dissipation structure is formed on the back side of the reflecting mirror. If it is such, the distance of LED and a thermal radiation structure can be made very short, for example, the contribution of the thermal radiation effect by the heat conduction which made the air the medium can also be enlarged.

As a specific embodiment of the heat conducting member, the heat conducting member is a heat pipe. If it is such, since it can be set as the heat conductive member of a very thin diameter, it can minimize that the light reflected in the reflective surface is interrupted, and does not impair the light quantity. be able to.

In order to be able to adjust the irradiation range of the reflection type illumination device, any position adjustment mechanism that adjusts the distance of the substrate to the reflection surface may be used.

In order to improve the heat conduction efficiency by improving the fixing condition between the heat conducting member and the reflecting mirror, and to increase the range in which the relative position between the LED and the reflecting surface can be adjusted, the heat dissipation structure Is provided on the outer side of the reflecting mirror, the fixing part to which the other end of the heat conducting member is fixed, the contact part in contact with the back side of the reflecting surface, and provided between the fixing part and the contact part, What is necessary is just to be comprised from the fin part formed in the spiral.

As an embodiment for enhancing the heat conduction efficiency of the heat conducting member without using a complicated mechanism and increasing the movable range with respect to the reflective surface of the LED, the heat conducting member comprises the reflector, the substrate, and the like. What is necessary is just to be provided in between.

In order to improve the uniformity of the light reflected from the reflecting surface and reaching the irradiation target, the surface of the reflecting surface only needs to be subjected to a textured process including a plurality of circular concave surfaces.
In order to prevent dust and the like from adhering to the reflecting surface, even if the front side of the reflecting mirror is covered, the distance between the LED and the reflecting surface can be easily changed from the outside without removing the cover, In order to be able to adjust the illumination range, a transparent cover provided so as to cover the front side of the reflecting mirror is further provided, and the position adjusting mechanism includes a connecting member that connects between the substrate and the transparent cover; And an adjustment unit that is provided outside the transparent cover and moves the substrate in the optical axis direction of the reflecting mirror via the connection member.

Thus, according to the present invention, since the heat dissipation structure is formed on the back side of the reflecting mirror, the distance for transferring heat by the heat conducting member can be shortened compared to the conventional case, so that the heat dissipation efficiency is improved. Can do. Furthermore, since the rod-like heat conduction member is provided radially from the substrate to the outer edge of the reflecting mirror, it is possible to reflect the strong light of the central portion emitted from the LED on the reflecting surface without waste, It is possible to increase the amount of light irradiated to the irradiation target from the entire reflective illumination device.

1 is a schematic perspective view showing a reflective illumination device according to an embodiment of the present invention. The typical sectional view showing the structure of the reflection type lighting device in the embodiment. The schematic diagram which shows an example of the use condition of the reflection type illuminating device in the embodiment. The typical sectional view showing the structure of the reflection type lighting device concerning another embodiment of the present invention. The typical sectional view showing the structure of the reflection type lighting installation concerning another embodiment of the present invention. The typical sectional view showing the structure of the reflection type lighting installation concerning a different embodiment of the present invention. The typical perspective view which shows the reflection type illuminating device which concerns on further different embodiment of this invention. The typical sectional view showing the reflective illumination device in still another embodiment of the present invention. The typical sectional view showing the reflection type lighting installation concerning other embodiments of the present invention. The typical perspective view which shows the reflection type illuminating device which concerns on other embodiment of this invention. The typical sectional view showing the structure of the conventional reflection type lighting installation. In the conventional reflection type illuminating device, a typical sectional view showing the case where the heat dissipation structure is removed and the heat pipe is directly fixed to the concave mirror.

DESCRIPTION OF SYMBOLS 100 ... Reflective type illumination device 1 ... Reflective mirror 11 ... Reflecting surface 2 ... Heat radiation structure 3 ... LED
4 ... Substrate 5 ... Heat conduction member (heat pipe)
6 ... Position adjustment mechanism 61 ... Connection member 62 ... Adjustment part 7 ... Transparent cover

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The reflective illumination device 100 according to the present embodiment is a reflective shadowless illumination device used for medical use, particularly for dental treatment, and has a concave surface on the front side as shown in FIGS. 1 and 2. 11, a substrate 4 provided so as to face the central portion 12 of the reflection surface 11, and an LED 3 that is attached to the substrate 4 and emits light toward the reflection surface 11. , And a heat radiating structure 2 is formed on the back side of the reflecting mirror 1, and a heat pipe 5 serving as a heat conducting member for thermally connecting the heat radiating structure 2 and the substrate 4 is provided. . As shown in FIG. 3, the reflective illumination device 100 illuminates a predetermined region by once reflecting the light from the LED 3 so as to be directed inward by the reflecting surface 11, and the LED 3 and the substrate 4. In addition, the illumination is performed so that the shadow of the dentist's finger or the treatment tool J interposed between the irradiation region and the reflecting surface 11 does not occur in the predetermined region. Each part will be described below.

The reflecting mirror 1 has a shape obtained by removing a bowl shape from a substantially short cylindrical shape formed of a metal such as aluminum or copper having good thermal conductivity, and the reflective surface is obtained by performing aluminum deposition on the inner surface thereof. 11 is formed. The reflecting surface 11 formed on the front side of the reflecting mirror 1 has a concave shape, and is specifically a parabolic mirror or an ellipsoidal mirror.

The heat dissipating structure 2 formed on the back side of the reflecting mirror 1 is a fin 21 formed by providing annular grooves at regular intervals on the side surface of the cylindrical body centered on the optical axis. The depth of the grooves forming the fins 21 is formed as deep as possible within a range not reaching the reflecting surface 11 on the front side. That is, since the fin 21 which is the heat radiating structure 2 is formed directly on the reflecting mirror 1 itself, the heat transferred to the reflecting mirror 1 can be quickly radiated.

The substrate 4 has a truncated conical shape made of a highly heat conductive material such as metal (for example, aluminum or copper), and the tip of the heat pipe 5 is incident on the side surface substantially perpendicularly. It is provided to do. And LED3 is provided in the reflective surface 11 side, and the light inject | emitted from LED3 is made to irradiate the reflective surface 11 without irradiating to an illumination target object (not shown) directly. The light reflected by the reflecting surface 11 is irradiated onto the illumination object.

The LED 3 is provided on the surface of the substrate 4 on the reflective surface 11 side, and emits light in the visible light range toward the reflective surface 11. The LED 3 includes light emitting elements of R (red), G (green), and B (blue), and emits these colors so as to be mixed. In the present embodiment, one LED 3 is provided in the central portion 12 of the reflective surface side surface of the substrate 44.

The heat pipe 53 has a distal end portion fixed to the substrate 4 and a proximal end portion fixed to the outer edge portion 13 of the reflecting mirror 1. Here, in this embodiment, the board | substrate 4, the reflective mirror 1, and the heat pipe 5 are fixed by welding or press fit, and it is comprised so that sufficient heat conduction may be performed. The heat pipe 5 has two functions: a function of transferring heat generated in the LED 3 to the heat dissipation structure 2 and a function of holding the substrate 4 and the LED 3 in a predetermined position. In the present embodiment, the four heat pipes 5 are provided radially from the substrate 4 to the outer edge portion 13 of the reflecting mirror 1 at 90 degrees as viewed from the optical axis direction, thereby supporting the substrate 4 and the LEDs 3. And heat transfer. The specific structure of the heat pipe 5 will be described. For example, the heat pipe 5 is a pipe formed of copper, aluminum, stainless steel, or the like. A groove structure as a capillary structure is formed on the inner wall thereof, and a small amount of water and freon are contained therein. Alternatively, a heat medium such as ammonia is sealed in a vacuum.

According to the reflection type illumination device 100 configured as described above, since the heat pipes 5 are provided radially from the substrate 4 to the outer edge portion 13 of the reflection mirror 1, the substrate 4 and the reflection mirror 1 are provided with the heat pipe 5. Even if both ends of the heat pipe 5 are completely fixed by welding or press-fitting, the heat pipe 5 provided at an angle can bend the central portion, and the position of the substrate 4 can be changed minutely. can do. Therefore, it is possible to adjust the position and orientation of the LED while the heat pipe 5 is directly fixed to the reflecting mirror 1 and the heat can be sufficiently transferred.

Moreover, since the heat dissipation structure 2 is provided on the back side of the reflecting mirror 1, the heat generated in the LED 3 is transferred to the heat dissipation structure 2 by the substrate 4 and the heat pipe 5 without using an extra member. , Can dissipate heat. Therefore, compared with the prior art, the distance by which heat is transferred by the heat pipe 5 can be significantly shortened, so that the heat dissipation efficiency can be improved.

Further, since the heat pipe 5 is provided from the substrate 4 to the outer edge portion 13 of the reflecting mirror 1, the heat pipe 5 is provided at the central portion 12 of the reflecting mirror 1 as in the prior art, and the reflecting surface 11. Compared with the case where a hole or the like is provided in the central portion 12, the light emitted from the LED 3 can be reflected without wasting at all the strength of the central portion 12. That is, the amount of reflected light returning from the reflecting surface 11 can be increased, and the amount of light as the reflective illumination device 100 can be further improved.

In addition, since a plurality of heat pipes 5 are provided radially from the substrate 4 to the outer edge portion 13 of the reflected light, and the heat pipes 5 support each other diagonally, a load to be supported is provided vertically. This can be improved compared to the case. That is, even if the diameter of the heat pipe 5 is reduced, the LED 3 and the substrate 4 can be supported and the diameter can be reduced, so that the light reflected from the reflecting surface 11 is blocked by the heat pipe 5. Can be minimized. That is, the amount of light that can be irradiated by the heat pipe 5 can be hardly impaired.

In addition, since there is no heat pipe 5 extending from the substrate 4 to the central portion 12 of the reflecting mirror 1, the light emitted from the LED 3 is not blocked by the heat pipe 5 until it reaches the reflecting surface 11. It is possible to greatly improve the light amount loss of the reflective illumination device 100 as a whole.

Further, since the heat pipe 5 is directly fixed to the reflecting mirror 1 so as to dissipate heat from the reflecting mirror 1 itself, the heat dissipating member such as a fin protrudes greatly from the back surface of the reflecting surface as in the prior art. There is no need to increase the heat dissipation amount. That is, the design restriction coming from the heat dissipation structure is weakened, and the degree of freedom in designing an equal shape that can make the shape of the back side of the reflecting surface substantially flat as in this embodiment is increased. As a result, it becomes easy to provide the reflective illumination device 100 of the present embodiment on a plane such as a ceiling, and can be used for various applications.

Other embodiments will be described. In addition, the same code | symbol shall be attached | subjected to the member corresponding to the said embodiment.

As shown in FIG. 4, the reflective illumination device 100 of the embodiment may further include a position adjusting mechanism 6 that adjusts the distance of the substrate 4 with respect to the reflective surface 11. Specifically, a rod-shaped guide portion 61 that extends from the reflecting surface 11 toward the substrate 4 and is inserted into a hole formed in the substrate 4, and the substrate 4 is detachably fixed to the guide portion 61. What is necessary is just to be provided with the fixing | fixed part 62 to perform. The fixing part 62 is constituted by a screw hole and a set screw which are formed on the side surface of the substrate 4 and which go to the guide part 61. If it is such, the distance of the said LED3 and the said reflective surface 11 can be adjusted, and the irradiation range by reflected light can be adjusted now appropriately.

As shown in FIG. 5, the heat dissipation structure 2 may be formed so as to protrude perpendicularly to the curved surface from the back side of the reflecting mirror 1. More specifically, the heat dissipating structure 2 is generally formed in a spring shape, provided on the outside of the reflecting mirror, and a fixing portion 22 to which the other end of the heat pipe 5 as a heat conducting member is fixed, It comprises a contact portion 23 in contact with the back side of the reflecting surface, and a fin portion 24 provided between the fixing portion 22 and the contact portion 23 and formed in a spiral shape. In this embodiment, the pair of heat pipes 5 and the heat dissipation structure 2 are provided so as to be line symmetric with respect to the optical axis of the reflecting mirror 1. Since such a heat dissipation structure 2 is formed in a spring shape, the restoring force is reduced by shrinking in advance and attaching the fixing portion 22 and the substrate 4 symmetrically with the heat pipe 5. Thus, the contact portion 23 can be pressed against the back side of the reflecting mirror 1 without a substantial gap. Therefore, the heat generated in the LED and transferred to the fixing portion 22 by the heat pipe 5 can be efficiently transferred to the reflecting mirror 1 through the contact portion 23 while dissipating the heat in the fin portion 24. Since the area can be further increased, the heat dissipation efficiency can be improved. Further, when the LED 3 and the substrate 4 are moved in the front-rear direction with respect to the reflecting surface 11, the heat dissipation structure 2 is formed in a spring shape, so that the movement amount can be absorbed by expansion and contraction. This makes it possible to set the illumination range more easily.

As shown in FIG. 6, the end portion of the heat pipe 5 is not fixed to the reflecting surface 11 of the reflecting mirror 1, but is directly fixed to the heat dissipation structure 2 in the outer edge portion 13. May be bent to the opposite side of the reflecting surface 11 and fixed to the substrate 4. Further, as shown in FIG. 6, one end of the heat pipe 5 is incident on the side surface of the substrate 4 that is formed obliquely, and the other end is incident on the reflecting mirror 1 with a slight inclination. It is configured.

In such a case, since the heat pipe 5 is bent in advance, when adjusting the positional relationship between the substrate 4 and the LED 3 and the reflecting surface 11, not only the expansion and contraction of the heat pipe 5 in the axial direction, The amount of change can be absorbed even by bending, and the movable range of the substrate 4 and the LED 3 can be further increased.

Further, for example, if the light irradiation direction of the reflecting mirror is vertically downward, the heat pipe 5 is fixed vertically to the reflecting mirror 1, and thus is incident and fixed obliquely. Compared to the case, it is easy to return to the vicinity of the LED 3 that is the heat generating portion and liquefy in the vicinity of the heat radiating structure 2, so that the heat dissipation efficiency can be further improved.

In addition, as shown in FIG. 6, the heat pipe 5 may be bent to the reflective surface side, for example, in addition to the heat pipe 5 bent to the opposite side of the reflective surface 11.

In the embodiment, the heat dissipation structure is a fin extending in the radial direction in the reflecting mirror, but may be extending in another direction, for example, the axial direction. In short, what is necessary is just to have the heat dissipation structure formed in the reflecting mirror itself.

In the embodiment, the LED and the substrate are supported by the four heat pipes and the heat is transferred to the heat dissipation structure. However, the number may be two or three. A plurality of heat pipes greater than four may be used. Further, the heat conducting member is not limited to the heat pipe, and may be another heat conducting member. In addition, in the above-described embodiment, the substrate portion of the heat pipe is provided at the outer edge portion of the reflecting mirror, particularly the outer edge portion of the reflecting surface. For example, the heat pipe substrate portion may be directly attached to the fin that is a heat dissipation structure. It doesn't matter.

Further different embodiments of the present invention will be described with reference to FIGS. In this embodiment, as shown in the perspective view of FIG. 7, four LEDs 3 are formed in a cross shape from the substrate 4 provided so that light is emitted to the reflecting surface 11 toward the outer edge portion 13 of the reflecting surface 11. The heat pipe 5 is extended. The heat pipe 5 is incident perpendicularly to the side surface of the substrate 4 and is substantially parallel to a plane including a virtual circle formed by the outer edge portion 13 of the reflecting mirror 1. The heat pipe 5 is connected to a heat radiating block 2 which is a heat radiating structure formed in a cross shape on the back side of the reflecting mirror 1, and the heat generated by the LED 3 is transmitted to the substrate 4, the heat pipe 5, and the heat radiated. It is transmitted in the order of block 2 so as to dissipate heat efficiently.

As shown in FIGS. 7 and 8, the heat dissipating block is provided along the back side of the reflecting mirror 1 by combining two blocks having a substantially rectangular parallelepiped shape in the vertical and horizontal directions. The tip portion protrudes from the outer edge portion 13 of the reflecting mirror 1 when viewed from the surface 11 side. One end of the heat pipe 5 is bent and connected to a portion where the heat dissipation block protrudes outward from the reflecting mirror 1. Even in this configuration, the irradiation range of the reflected light from the reflecting surface 11 can be adjusted by moving the positions of the LED 3 and the substrate 4 back and forth by the position adjusting mechanism 6 by the elasticity of the heat pipe 5.

In addition, embossing is performed to provide a large number of circular concave surfaces 111 so as to cover the surface of the reflective surface 11 so that the reflected light from the reflective surface 11 is uniform.
Moreover, you may provide a transparent cover so that the reflective illumination apparatus of each said embodiment may cover the front side of a reflective mirror. If such a thing is used, it can prevent that dust etc. adhere to a reflective surface and an illumination light rate falls. More specifically, as shown in the sectional view of FIG. 9A, the front perspective view of FIG. 10A, and the rear perspective view of FIG. 10B, the transparent cover 7 is schematically made of, for example, a transparent resin. It is formed in a flat cylindrical shape, and its upper surface side slightly bulges outward in a partial spherical shape, and its side peripheral wall passes outside the portion attached to the reflecting mirror 1 of the heat pipe 5. The bottom surface side is formed in four partial annular plate shapes so as to fill the space of the radial method between the heat dissipating blocks 2. Furthermore, in this embodiment, a position adjusting mechanism 6 for adjusting the distance to the reflecting surface 11 of the LED 3 is provided between the transparent cover and the substrate 4.

That is, the position adjusting mechanism 6 is provided on the outside of the transparent cover 7 and the connection member 61 that connects the substrate 4 and the transparent cover 7, and the substrate 4 is moved through the connection member 61. And an adjusting unit 62 for moving back and forth in the optical axis direction of the reflecting mirror.

The connection member 61 is a rod-shaped member that extends from a through hole formed in the center of the bottom surface of the substrate 4 to the center of the top surface of the transparent cover 7 and extends to the outside of the transparent cover. 61 are arranged so that the outline of 61 is inside the substrate 4. One end of the connecting member 61 is fixed to the bottom surface of the substrate 4, and the other end is slidably inserted into a through hole provided in the transparent cover 7.

The adjusting portion 62 is fixed in a state where the connecting member 61 protrudes to the outside of the transparent cover by a predetermined length. The adjusting portion 61 is constituted by a thread groove formed on the other end side of the connection member 61 and a nut screwed with the thread groove on the outside of the transparent cover. That is, when the nut is rotated on the outer surface of the transparent cover 7 so as to advance toward the reflecting mirror 1, the nut is pressed by the transparent cover 7 and the connecting member 61 side where the thread groove is cut moves. Will do. As a result, as shown in FIG. 9B, the heat pipe 5 can be bent and the position of the LED 3 can be separated from the reflecting mirror 1. On the other hand, when the nut is rotated so as to move away from the reflecting mirror 1, the deflection of the heat pipe 5 returns to the position shown in FIG. 9A. In such a position adjusting mechanism 6, since the adjusting unit 62 is provided outside the transparent cover 7, there is no need to remove the transparent cover 7 and adjust the position of the LED 3. On the other hand, even if it is fixed with an adhesive or the like, the position of the LED 3 can be adjusted from the outside. The connecting member 61 is not limited to a rod-shaped member, and may be one that connects the substrate 4 other than the central portion of the transparent cover 7. The adjustment unit 62 may be provided outside the transparent cover 7. For example, a plurality of small holes are arranged in the side surface of the connection member in the optical axis direction, and a stop pin is inserted into any small hole. The position of the substrate 4 and the LED 3 may be adjusted.

In order to connect the LED and the power source, a power source such as a battery may be provided on the back side of the reflecting mirror, and wiring may be provided along the heat pipe.

In the above-described embodiment, it is used for medical use and dental use. However, for example, the above-described reflective illumination device may be used for a car light or the like.

Besides, various modifications and combinations of embodiments may be performed as long as they do not contradict the gist of the present invention.

Even if one end of the heat conducting member is fixed to the substrate and the other end is directly fixed to the reflecting mirror, the position and orientation of the LED can be finely adjusted with the reflective illumination device of the present invention. The heat radiation efficiency of the generated heat can be further improved, and light having high intensity in the central part emitted from the LED can be used effectively.

Claims

A reflecting mirror having a concave reflecting surface formed on the front side, a substrate provided to face the central portion of the reflecting surface, and an LED that is attached to the substrate and emits light toward the reflecting surface A reflective illumination device comprising:
One end is fixed to the substrate, the other end is fixed to the reflecting mirror, and a rod-shaped heat conducting member that thermally connects the substrate and the reflecting mirror is directed from the substrate toward the outer edge of the reflecting mirror. The reflection type illumination device is provided radially.
The reflective illumination device according to claim 1, wherein a heat dissipation structure is formed on the back side of the reflecting mirror.
The reflective illumination device according to claim 1, wherein the heat conducting member is a heat pipe.
The reflective illumination device according to claim 1, further comprising a position adjusting mechanism that adjusts a distance of the substrate to the reflective surface.
The heat dissipating structure is provided on the outer side of the reflecting mirror, the fixing part to which the other end of the heat conducting member is fixed, the contact part in contact with the back side of the reflecting surface, and between the fixing part and the contact part The reflective illumination device according to claim 1, further comprising: a fin portion provided in a spiral shape.
The reflection type lighting device according to claim 1, wherein the heat conducting member is bent between the reflecting mirror and the substrate.
The reflective illumination device according to claim 1, wherein the surface of the reflective surface is subjected to a textured process comprising a plurality of circular concave surfaces.
A transparent cover provided to cover the front side of the reflecting mirror;
The position adjusting mechanism is provided on the outside of the transparent cover and a connecting member that connects the substrate and the transparent cover, and advances and retracts the substrate in the optical axis direction of the reflecting mirror via the connecting member. The reflective illumination device according to claim 4, further comprising an adjustment unit.