JP2012146450A - Light guide member and lighting system equipped with the same, as well as lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a lighting system with fine light distribution characteristics cannot be obtained with the lighting system that uses LEDs as a light source, and especially, the lighting system having light distribution characteristics equivalent to those of an incandescent bulb cannot be obtained.SOLUTION: The lighting system, provided with a light source module and a light guide member arranged in opposition to a light-emitting part of the light source module for propagating light beams of the light source module, illuminates by emission light from the light guide member. The light guide member has optical function faces at a first end part adjacent to the light-emitting part and a second end part at the opposite side, the optical function faces transmitting part of light beams and reflecting the rest, and at the same time, has a light extraction structure at each side face adjacent to the first end part as well as the second end part.

Description

  The present invention relates to a lighting device.

  In recent years, lighting devices employing light-emitting diodes (hereinafter referred to as “LEDs”) that can be reduced in size, power consumption, and lifetime as compared with conventional incandescent bulbs have been actively developed.

  As an example, there is an illumination device as disclosed in Patent Document 1, for example. In Patent Document 1, a translucent member is provided with a base at one end and spreads in a trumpet shape toward the opening at the other end, and a translucent layer having a phosphor layer on the inner surface attached to the opening of the trumpet member. And a substrate provided inside a substantially spherical body formed by a trumpet-shaped member and a light-transmitting cover, and an LED mounted on the outer surface of the substrate facing the light-transmitting cover. .

  As another example, an illumination device as disclosed in Patent Document 2 has been developed. In Patent Document 2, a light guide that guides light from a plurality of LEDs is provided, and in order to improve the luminance of the light exit surface of the light guide, the light guide is substantially the same as the region where the LEDs are disposed and the shape and area. The exit surface has the same entrance surface and an exit surface area 0.7 to 0.92 times the area of the entrance surface, and the height from the entrance surface to the exit surface is 10 times the area of the entrance surface. It has a frustum shape with a value within double. An air layer is provided between the light guide and the LED, and the incident surface is arranged to face the LED. Furthermore, it forms a dent that opens to the center of the exit surface of the light guide and tapers toward the entrance surface, diffuses light incident on the surface where the dent is formed, to the side of the light guide, Not only the exit surface of the light guide but also the end surface on the exit surface side is illuminated.

JP 2001-243807 A JP 2008-159453 A

  However, in the case of the illuminating device of Patent Document 1, although an LED bulb compatible with a conventional incandescent bulb can be provided, an incandescent bulb is provided because the light distribution is different from that of a conventional incandescent bulb. When an LED bulb is attached as an alternative to the position, there is a problem that the illumination level of the irradiated region is different because it differs from the conventional light distribution.

  Moreover, in the case of the illumination device of Patent Document 2, a light guide is provided to guide light from a plurality of LEDs, and the luminance of the exit surface of the light guide can be improved. However, there is a problem that it is different from the light distribution of the conventional incandescent bulb. In addition, although a recess is formed on the exit surface of the light guide and the side of the light guide is illuminated, the brightness of the exit surface and the side of the light guide is improved, but it is different from the illumination of incandescent bulbs. The problem has not been resolved.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an illuminating device having a good light distribution characteristic, and in particular, a wide light distribution characteristic similar to an incandescent lamp. It is providing the illuminating device which becomes.

  Moreover, the light guide member of the present invention is a light guide member having a first end portion for allowing light to enter and a second end portion facing the first end portion. It has an optical functional surface, and has a light extraction structure on the side surface adjacent to the first end and the second end, and the optical functional surface transmits a part of the light beam and reflects the remaining light beam. Features.

  According to the said structure, while being able to utilize the light ray which propagates a light guide member efficiently, it can be set as the light guide member which can be set as more suitable light distribution.

  Moreover, the illuminating device of this invention is equipped with the light source module and the light guide member which is arrange | positioned facing the light emission part of a light source module, and propagates the light ray of a light source module, and illuminates with the emitted light from a light guide member. The light guide member has an optical functional surface at the second end opposite to the first end close to the light emitting portion, and is adjacent to the first end and the second end. It has a light extraction structure on the side surface.

  According to the said structure, while being able to utilize the light ray which propagates a light guide member efficiently, it can be set as the illuminating device which can be set as more suitable light distribution.

  In the illumination device of the present invention, the optical functional surface is a surface that transmits a part of the light beams of the light source module propagating through the light guide member and reflects the remaining light beams. To do.

  According to the above configuration, since a part of the light beam propagating through the light guide member can be reflected, the illumination device can efficiently use light and have a more appropriate light distribution. can do.

  In the illumination device of the present invention, the light extraction structure reflects light beams in the same direction as the light emitted from the light emitting unit of the light source module among the light beams of the light source module propagating through the light guide member, and reflected by the optical function surface. It is characterized in that it is a structure that takes out the emitted light to the outside and emits it.

  According to the said structure, while being able to take out light efficiently to the exterior of a light guide member, it can be set as the illuminating device which can make light into light distribution.

  In the illumination device of the present invention, the light extraction structure has a first light extraction structure provided on a side surface near the first end of the light guide member, and a side surface near the second end of the light guide member. The second light extraction structure is provided, and in the first light extraction structure, the light in the same direction as the light emitted from the light emitting portion of the light source module is extracted to the outside of the light guide member, and the second light extraction is performed. The structure is characterized in that the light beam reflected by the optical functional surface is taken out of the light guide member.

  According to the above configuration, the light can be efficiently extracted to the outside of the light guide member, and the light extracted to the outside can be controlled by the light extraction structure in each region. It can be set as the illuminating device which can do.

  Moreover, the illumination device of the present invention is characterized in that the optical functional surface has a shape recessed toward the inside of the light guide member.

  According to the above configuration, when the optical functional surface is a flat surface, the light reflected from the optical functional surface returns to the light source module, resulting in a loss of light amount. Since the light can be efficiently extracted to the outside of the light guide member, the lighting device can distribute light.

  Moreover, the lighting device of the present invention is characterized by including the lighting device of the present invention. A lighting device with a wide light distribution similar to an incandescent bulb can be obtained.

  The present invention can provide an illuminating device in which light emitted from the light source is controlled by the light guide so that the light distribution characteristics of the light emitted from the light guide are good. Moreover, it can be set as the illuminating device of the light distribution characteristic close | similar to an incandescent lamp. Furthermore, by providing the lighting device of the present invention with a lighting device, a lighting device with good light distribution characteristics can be obtained.

It is the schematic of the whole illuminating device in Embodiment 1, (a), and sectional drawing (b). It is the side view (a) and sectional drawing (b) of the light guide member of the illuminating device in Embodiment 1. 6 is an explanatory diagram of a light extraction structure in each region of the lighting device in Embodiment 1. FIG. 3 is an example of a light distribution by the lighting device in the first embodiment. 3 is an example of a light distribution by each region of the lighting device in the first embodiment. FIG. 3 is a relationship diagram between an optical functional surface and light rays in the first embodiment. It is a figure of the side view (a) and sectional drawing (b) of the light guide member of the illuminating device in Embodiment 2. FIG. 10 is an example of a light distribution by the illumination device according to Embodiment 3.

  Although each of Embodiment 1-3 is demonstrated below, this invention is not limited to these.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to the drawings. 1A and 1B show the overall configuration of the lighting apparatus according to Embodiment 1, FIG. 1A is a schematic view, and FIG. 1B is a cross-sectional view of a light source module and a light guide member.

  The lighting device 1 according to the present embodiment includes a light source module 2 including a light emitting element, a light guide member 3 for propagating light emitted from the light source module 2, a base 4 connected to an external power source, and a light source module. 2 is provided with a power circuit board (not shown) for supplying power to the power source 2. Details of each configuration of the illumination device 1 of the present embodiment will be described below.

  The light source module 2 includes a light emitting unit 2a made of a light emitting element such as an LED or an electroluminescence element, and a fixed unit (not shown) including a substrate on which the light emitting unit 2a is mounted. When using LED as a light emitting element, it is preferable to set it as the structure which mounted multiple or single LED on the ceramic substrate. Further, a heat radiating member (not shown) that fixes the light emitting element to the substrate and enhances heat radiation of the light emitting element may be provided as appropriate.

  Further, a holding member for fixing the light guide member 3 is provided on the light emission side of the light emitting unit 2a of the light source module 2, and the efficiency with which the emitted light from the light emitting unit 2a is coupled to the light guide member 3 (hereinafter referred to as optical coupling efficiency). ) Is set by the holding member so that the distance between the light guide member 3 and the light emitting portion is optimized.

  The holding member may be formed integrally with the light guide member 3. By forming them integrally, the number of parts can be reduced and the number of assembly steps can be reduced. Any material may be used for the holding member, but when a function of transmitting the light emitted from the light source module 2 is given, for example, polycarbonate resin, acrylic resin, cycloolefin polymer resin, or the like may be used. By making the holding member a light-transmitting material, the light transmitted through the holding member and the light emitted from the light guide member 3 can be combined into the lighting device 1 with good light distribution characteristics. The area to be provided can be optimally illuminated. Here, the light distribution characteristic (light distribution) indicates in what direction (angle) and how much light is emitted from a light source or a lighting fixture.

  Further, a reflection member (not shown) may be provided between the light source module 2 and the light guide member 3. For example, if the light guide member 3 is cylindrical, a reflection sheet may be provided so as to cover the outer periphery thereof. By providing the reflection member, the light emitted from the light emitting portion 2a that has not entered the light guide member 3 can be reflected by the reflection member and incident on the light guide member 3, so that the light utilization efficiency can be improved.

  Next, the light guide member 3 will be described. The light guide member 3 is disposed so that light emitted from the light emitting unit 2a of the light source module 2 is incident on the first end 3a on the light emitting unit side of the end of the light guide member 3, and the light guide member In this structure, light incident on the light guide member 3 propagates inside the light guide member 3.

  The light propagating through the light guide member 3 is emitted from the second end 3b opposite to the first end 3a, and from the side 3c adjacent to the first end 3a and the second end 3b. It is the structure which illuminates the area | region provided with the apparatus 1 optimally. At this time, the side surface 3c is provided with the light extraction structure 5 so as to control the emission direction when the light propagating inside the light guide member 3 is emitted to the outside of the light guide member 3. Yes.

  The second end 3b is provided with an optical functional surface 6 that transmits a part of the light and reflects the remaining light. The light extraction structure 5 and the optical function surface 6 provided on the side surface 3c of the light guide member 3 will be described in detail later.

  The light guide member 3 has a function of transmitting light emitted from the light emitting portion 2a of the light source module 2, and the material is not particularly limited. For example, a polycarbonate resin, a cycloolefin polymer resin, or the like may be used. In addition, the shape of the light guide member 3 is not particularly limited, but for example, a cylindrical shape or a polygonal column shape is preferable because it is possible to optimally illuminate the entire region including the illumination device 1.

  What is necessary is just to produce such a light guide member 3 by shaping | molding, for example. The light extraction structure 5 provided on the side surface 3c of the light guide member 3 can be formed by molding using a mold corresponding to each shape. The optical functional surface 6 can be formed by forming an optical functional film having transmission and reflection functions on the second end surface 3b of the molded light guide member 3 by vapor deposition or the like. Further, if a fixing portion is formed on the light guide member 3, it can be fixed to the light source module 2 or the base 4.

  The base 4 is a member for connecting an external power source (not shown) and the light source module 2. When attaching the illuminating device 1 to an illuminating device, the structure which the attachment part provided in the illuminating device and the nozzle | cap | die 4 are fixed, and an external power supply is supplied to the illuminating device 1 may be sufficient. Moreover, when the illuminating device 1 of this invention substitutes for an incandescent lamp, the illuminating device 1 of this invention and an incandescent bulb can be replaced | exchanged easily by making the nozzle | cap | die 4 into a structure equivalent to the thing of an incandescent bulb. I can do it. The base 4 may have a structure including a power circuit board. In FIG. 1, the base 4 and the light source module 2, and the light source module 2 and the light guide member 4 are fixed.

  As shown in FIG. 1, the lighting device 1 according to the present embodiment does not include a cover called a glove that is included in a normal incandescent bulb or LED bulb. With this configuration, the light source module 2 can be arranged in a closed space corresponding to the cover by the light guide member 3 and the holding member. With this configuration, it is possible to prevent troubles such as a short circuit due to dust, dust or the like entering the electrode portion of the light source module from the outside. In addition, since the user cannot directly touch the electrode portion, accidents such as electric shock can be prevented. Of course, the light source module 2 may be arranged in a space sealed by a holding member or the like, or may be provided with a cover.

  Although not shown here, the light source module 2 may be installed, and a heat radiating member for radiating heat generated from the light source module 2 to the outside may be provided. The heat dissipation member may be configured to be in contact with the light source module 2 and provided between the light guide member 3 and the base 4. Further, a hollow portion may be provided inside the heat dissipation member, and a power supply circuit board (not shown) for connecting the light source module 2 and the power supply circuit may be accommodated in the hollow portion. The material of the heat radiating member is preferably composed of a metal such as aluminum or a resin.

  Next, the function of the light guide member 3 will be described in more detail with reference to FIG. FIG. 2 is a side view (a) and a cross-sectional view (b) of the light guide member 3. The light guide member 3 is provided with a first end portion 3 a on the light emitting portion side, a second end portion 3 b on the opposite side to the light emitting portion, and the second end portion 3 b is an optical functional surface 6. Further, the light extraction structure 5 is provided on the side surface 3 c of the light guide member 3. Next, the light extraction structure 5 and the optical function surface 6 will be described.

  The light extraction structure 5 is provided so as to control the direction in which the light propagating inside the light guide member 3 is emitted to the outside. The light propagating through the light guide member 3 is emitted light from the light emitting unit of the light source module 2, and after being optically coupled at the first end 3 a of the light guide member 3, Propagating light (hereinafter referred to as traveling light A) and light reflected by the optical functional surface 6 of the second end 3b of the light guide member 3 and propagating in the direction of the first end 3a (hereinafter reflected light). B)), and is provided so as to control the direction in which each light is emitted from the light guide member 3 to the outside. The direction control will be described with reference to FIG.

  The optical functional surface 6 transmits a part of the light (traveling light A) from the light source module 2 that has propagated through the light guide member 3 and emits the light to the outside, and reflects the remaining light (reflected light B). It has a structure to do. For example, if the optical functional surface 6 is a half mirror, about half of the light that travels through the light guide member 3 has reached the second end portion 3b is emitted from the light guide member 3 to the outside, and the rest Is reflected to the inside of the light guide member 3 to be reflected light B.

  The second end 3b is preferably the optical functional surface 6 for the following reason. For example, when the second end portion 3b is not a light functional surface but a transmission surface, the amount of light emitted from the second end portion 3b to the outside of the light guide member 3 increases. I can't get it. On the other hand, when the second end portion 3b is formed as a reflection surface by vapor deposition of a metal film or the like, there is no light emitted from the second end portion 3b, and the reflected light B increases, and the light extraction structure 5 provided on the side surface 3c increases to the outside. Since the emitted light increases, it becomes a ring-shaped light distribution as illumination, and sufficient light distribution characteristics cannot be obtained.

  By making the second end portion 3b an optical functional surface 6, light emitted from the second end portion 3b is secured, and light emitted to the outside by the light extraction structure 5 on the side surface 3c is transmitted light A and reflected light B. By making a good balance, it is possible to obtain better light distribution characteristics as the lighting device 1.

  The optical functional surface 6 of the second end 3b has a function of controlling not only the transmission and reflection of light but also the angle of light. The shape of the optical functional surface 6 may be any shape such as a flat surface, a curved surface, a conical surface, and a rectangular surface, but it is more preferable to have a hollow structure that is recessed with respect to the light guide member 3. Desirably, a concave structure having a curved surface is desirable. By making the optical functional surface 6 into a concave structure, the reflected light B is efficiently guided to the light extraction structure 5 provided on the side surface 3c of the light guide member 3, and is controlled and emitted from the light extraction structure 5 to the outside. I can do it.

  Furthermore, since the concave structure functions as a concave lens with respect to light (traveling light A) emitted from the second end 3b, the light is spread out and emitted to the outside, and the second of the light distribution in illumination. The peak of the amount of light from the end 3b can be suppressed and a continuous good light distribution can be obtained.

  Next, the light extraction structure 5 provided on the side surface 3c of the light guide member 3 will be further described with reference to FIG. In FIG. 2, the light extraction structure 5 includes four regions of light extraction structures 5 a, 5 b, 5 c, and 5 d from the first end portion 3 a side of the light guide member 3. Further, the light extraction structures 5a and 5b (first light extraction structures) are provided at positions close to the first end portion 3a, and mainly play a role of controlling the direction in which the traveling light A is emitted to the outside. . On the other hand, the light extraction structures 5c and 5d (second light extraction structure) are provided at positions close to the second end 3b, and mainly play a role of controlling the direction in which the reflected light B is emitted to the outside. Yes. Here, although the case where the light extraction structure 5 is composed of four regions is shown, each region of the light extraction structure is set so that the light distribution of the illumination device 1 is optimal. The light extraction structure 5 divided into four regions is composed of four types of prisms having different shapes, and determines the light that can be extracted to the outside of the light guide member 3 according to the angle and pitch of the prism, and the light is external. It is possible to control the direction in which the light is emitted. With the light extraction structure 5, the entire light distribution of the illuminating device 1 can be set to be optimal, and the region including the illuminating device 1 can be optimally illuminated.

  Next, an example of the relationship between the light extraction structure 5 of the illumination device 1 and the light distribution will be described with reference to FIGS. FIG. 3 is a diagram illustrating the shape of each region (5a to 5d) of the light extraction structure 5. FIG. Here, the light extraction structure 5 is described as a prism shape. And the shape in each area | region of the light extraction structure 5 of FIG. 3 was determined, and the light distribution of the illuminating device 1 was analyzed. 4 and 5 show the analysis of the light distribution, FIG. 4 shows an example of the light distribution of the illumination device 1, and FIG. 5 shows an example of the light distribution in each region. When the light distribution distributions in the respective regions in FIG. 5 are combined, the light distribution distribution of the entire illumination device in FIG. 4 is obtained. 5A to 5D correspond to the light extraction structures 5a to 5d. FIGS. 5E and 5F correspond to light from 5e and the second end 3b, respectively.

Here, the shape of each region of the light extraction structure 5 on the side surface 3c of the light guide member 3 is as follows. Here, the light guide member 3 is a cylinder, and the angle formed by the two surfaces forming the prisms in each region of the light extraction structure 5 and the ridgeline of the side surface 3c of the cylinder (the side surface when there is no light extraction structure) is formed. Are α and β from the light source side. Further, the pitch is defined as the interval between the valleys in the region where the two surfaces forming the prism intersect.
The light extraction structure 5a has α = 60 °, β = 70 °, and the pitch is 0.6 mm.
The light extraction structure 5b has α = 60 °, β = 88 °, and the pitch is 0.6 mm.
The light extraction structure 5c has α = 80 °, β = 40 °, and the pitch is 0.55 mm.
The light extraction structure 5d has α = 80 °, β = 45 °, and a pitch of 0.55 mm.

  The light extraction structures 5a and 5b have a smaller angle α on the side closer to the light source module 2, while the light extraction structures 5c and 5d have a larger angle on the side closer to the light source module 2. This is because the light extraction structures 5a and 5b mainly facilitate the extraction of the traveling light A, and the light extraction structures 5c and 5d mainly facilitate the extraction of the reflected light B.

  The light extraction structures 5a and 5b control the direction in which the outgoing light from the light emitting part of the light source module 2 is coupled to the light guide member 3 and propagates inside, and the traveling light A is emitted to the outside. Here, the light extraction structures 5a and 5b have different angles, and each region has a different light distribution characteristic. By adding the light distribution characteristics of each region, the light distribution distribution in the entire lighting device 1 is smoother. This is to achieve a proper light distribution.

  Here, although the light extraction structure 5 is made into 4 area | regions (5a, 5b, 5c, 5d), the positional relationship of the light emission part of the light source module 2 and the light extraction structure 5, ie, the side surface 3c of the light guide member 3, is provided. Depending on the position of the light extraction structure 5 provided, of the traveling light A or reflected light B propagating inside the light guide member 3, it corresponds to the position where the light at an angle that is easy to extract to the outside reaches the side surface 3 c of the light guide member 3. Thus, the shape of the light extraction structure 5 is determined. Next, the relationship between traveling light and reflected light propagating through the light extraction structure 5 and the inside of the light guide member 3 will be described in more detail with reference to FIG. Here, the angles of the traveling light A and the reflected light B are the angles formed with the ridgeline of the side surface 3 c of the light guide member 3.

  In the light extraction structure 5a, as shown in FIG. 3A, the light of the traveling light A1 out of the traveling light A is emitted to the outside of the light guide member 3, and the light of the traveling light A2 is inside the light guide member 3. Come back to. That is, the angle of the traveling light A propagating through the light guide member 3 can be selected and taken out of the light guide member 3. The reflected light B 1 of the reflected light B reflected from the optical function surface 6 is also extracted outside the light guide member 3. In the light extraction structure 5b, as shown in FIG. 3B, the traveling light A3 is extracted as in the light extraction structure 5a. However, since β is increased, the traveling light A3 travels larger than the angle of the traveling light A1. The light A3 is extracted outside the light guide member 3.

  On the other hand, in the light extraction structures 5c and 5d, the direction in which the reflected light B reflected by the optical function surface 6 out of the light propagating mainly inside the light guide member 3 is emitted from the side surface 3c of the light guide member 3 to the outside. The shape and pitch are set to control. In the light extraction structure 5 c, the reflected light B 3 out of the reflected light B is extracted outside the light guide member 3 as shown in FIG. Conversely, the traveling light A5 of the traveling light A is totally reflected by the prism. In the light extraction structure 5d, as shown in FIG. 3D, the reflected light B4 is extracted in the same manner as the light extraction structure 5c. However, if α is increased, the corresponding reflected light is transmitted to the outside of the light guide member 3. It is taken out.

  FIG. 4 shows the light distribution in the illumination device 1 using the light guide member 3 shown in FIG. 2 provided with the light extraction structure 5 described above. In the light distribution, the light source exists at the polar coordinate center, the vertical axis is the long side direction of the light guide member 3 (the direction toward the second end 3b), the 90 ° azimuth indicates the front, and the 270 ° azimuth indicates the rear. ing. The horizontal axis is the short side direction of the light guide member 3 (the direction toward the side surface 3c). 0 to 180 ° indicates the light distribution characteristic in the illumination to the front of the illumination device 1, and 180 to 360 ° indicates the light distribution characteristic in the illumination to the rear of the illumination device 1. In addition, the light extraction structure 5e in FIG. 2A does not form a prism but uses the side surface 3c of the light guide member 3.

  FIG. 6 shows the relationship between the light extraction structure 5e, traveling light (here, C and D), and reflected light. Here, a case where the optical functional surface 6 is a curved surface, particularly a spherical shape, and the light guide member 3 is a cylindrical shape will be described. The traveling light C that has entered the position away from the center of the spherical surface of the optical function surface 6 is reflected by the spherical surface and is emitted to the outside from the direction of the side surface 3 c of the light guide member 3. On the other hand, the traveling light D incident near the center of the spherical surface is reflected in the direction of the light guide member 3 to become reflected light D2, and the traveling light D transmitted through the optical function surface 6 moves forward while being slightly diffused as the outgoing light D1. Emitted.

  In FIG. 5, an example of the light distribution by each area | region of the light extraction structures 5a-5e is shown. FIGS. 5A to 5E correspond to the light extraction structures 5a to 5e. As described above, the light extraction structures 5a and 5b that extract the traveling light to the outside have a structure in which the traveling light can be easily extracted as shown in FIGS. 5A and 5B. Has appeared mainly. On the other hand, in the light extraction structures 5c and 5d, since the reflected light is easily extracted as shown in FIGS. 5C and 5D, the distribution of the direction of the reflected light appears more. Moreover, in the light extraction structure 5e, the side surface 3c of the light guide member 3 is used, and more distributions in a direction mainly perpendicular to the side surface appear. When the light distribution distributions of the respective regions in FIG. 5 are added, the light distribution distribution of the entire illumination device 1 in FIG. 4 is obtained. That is, a more optimal light distribution can be obtained by setting the shape of each region of the light extraction structure 5. In particular, when the light extraction structure 5 is a prism, the prism shape of each region can be set, so that a more optimal light distribution can be obtained.

  In the first embodiment, the light guide member 3 is described as a cylinder and the light extraction structure 5 of the prism is provided on the side surface 3c. However, the side surface 3c of the light guide member 3 is roughened or light scattering ink is used. Even when the light extraction structure 5 is provided by printing or the like, a light distribution similar to that of the prism can be obtained by setting a rough surface state or a printing state in each region. Further, when it is not particularly necessary to optimize the light distribution, the light extraction structure 5 having substantially the same shape can be provided by a prism, a rough surface, printing, or the like without dividing the region on the side surface 3c of the light guide member 3. A distribution close to the light distribution shown in FIG. 4 can be obtained.

  In the first embodiment, the configuration of the illumination device 1 in FIG. 1 has been described. However, the present invention is characterized in that the light guide member 3 of FIG. 2 is provided with the optical functional surface 6 and the light extraction structure 5. In the light guide member 3 of the present invention, a part of the light (traveling light) propagating through the light guide member 3 out of the light emitted from the light emitting unit of the light source module 2 is directed to the side surface 3c of the light guide member 3. The formed light extraction structure 5 and the second end portion 3b are emitted to the outside of the light guide member 3, and the rest are reflected by the optical function surface 6 to be reflected light inside the light guide member 3, so that the light guide member 3 is emitted to the outside of the light guide member 3 from the light extraction structure 5 formed on the side surface 3c.

  Here, the light extracted to the outside of the traveling light and the reflected light by the light extraction structure 5 formed on the side surface 3c of the light guide member 3 is emitted in the opposite direction as shown in FIG. Thus, the light emitted from the light emitting unit of the light source module 2 is emitted not only from the light guide member 3 in the same direction as the emitted light but also from the light guide member 3 in the direction opposite to the emitted light. As a result, light emitted from the light emitting portion of the light source module 2 is emitted over a wide range, and a wide light distribution can be realized.

  This is because the reflected light functions as if the optical function surface 6 is a light source. That is, the light source member 3 functions as if light sources are arranged at both ends, that is, at the first end and the second end. Therefore, if the length of the light guide member 3 is adjusted, the position of the optical functional surface 6 can be changed, and the light distribution can be adjusted as necessary. In FIG. The width of the base 4 is substantially the same as that of the light guide member 3, but when the width is large, the light emitted to the outside of the light guide member 3 can be increased by increasing the length of the light guide member 3. A wide light distribution can be achieved without being blocked.

  That is, regardless of the shape of the light guide member 3 and the surrounding shape, the light guide member 3 can obtain a wide light distribution by the optical functional surface 6 and the light extraction structure 5 regardless of the shape. I can do it.

  The present invention is not limited to the embodiments described above. That is, various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[Embodiment 2]
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. The description of the same reference numerals as those in the first embodiment is omitted. 7 shows the light guide member 3 of the lighting device 1 according to the second embodiment. FIG. 7A is a cross-sectional view, and FIG. 7B is a relationship diagram with light rays. In the second embodiment, as compared with the first embodiment, the shape of the optical functional surface 6 of the second end 3b is not a spherical surface but a combination of two cones. By using a combination of two cones as the shape of the optical functional surface 6, the area perpendicular to the traveling light is reduced compared to the case of a spherical surface, and instead of returning to the light source module 2, the reflected light has a certain angle. Accordingly, the amount of light reaching the light extraction structure 5 increases, and the amount of light emitted to the outside of the light guide member 3 increases.

  The light functional surface 6 may be formed by a single cone, but by combining two cones, the reflected light emitted from the light extraction structure 5e by the conical surface close to the side surface 3c of the light guide member 3 is used. And the light distribution characteristics of the entire lighting device can be improved.

  Another configuration of the optical functional surface 6 is a configuration in which a plane parallel to the surface of the light emitting unit of the light source module 2 is provided at the center of the conical surface, and a reflecting surface (for example, a mirror) is provided on the outer peripheral conical surface of the plane. It is good also as a provided structure. If the entire second end surface 3b is a reflective surface, the amount of light emitted forward is insufficient. Therefore, when forming the reflective surface, a pattern is provided so that the reflective surface is not formed in the portion corresponding to the plane at the center of the conical surface. However, the manufacturing cost can be reduced, and the shortage of light amount directly above the lighting device 1 can be compensated. Furthermore, the light rising vertically from the light source module 2 can be taken out as it is. Basically, it approximates a spherical surface, and can emit more light in the lateral and vertical directions than a spherical surface.

  The present invention is not limited to the embodiments described above. That is, various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[Embodiment 3]
The third embodiment of the present invention will be described below with reference to FIGS. The description of the same reference numerals as those in the first embodiment is omitted. The third embodiment relates to the illumination device 1 when the light extraction structure 5 provided on the side surface 3c of the light guide member 3 is a rough surface, and the configuration other than the light extraction structure 5 is the embodiment. It is good also as the same as the illuminating device in 1 and Embodiment 2. FIG. Here, as the rough surface, a surface roughening method such as electric discharge machining, spraying of fine particles such as Al ₂ O ₃ , imprinting, etching, and printing is applied to the side surface 3c of the light guide member 3. The surface is roughened.

  The degree of the rough surface is managed by the surface roughness. As the surface roughness becomes rougher, the emitted light and the reflected light inside the light guide member become closer to Lambert scattering and have a wider light distribution. Therefore, the degree of rough surface is set so that the overall light distribution of the lighting device 1 is optimal. As an example, as a rough surface structure of the light extraction structure 5 on the side surface 3c of the light guide member 3, Ra (center line average roughness) is preferably 50 μm or less.

  FIG. 8 shows the light distribution characteristics of the illumination device 1 when the light extraction structure 5 in the third embodiment is a rough surface. As shown in FIG. 8, when the light extraction structure 5 is a rough surface, the light distribution structure is similar to that of FIG. 4 which is the light distribution characteristic of the illumination device 1 when the light extraction structure 5 is a prism. Is possible.

  Here, the position of the rough surface structure may change depending on design matters such as the diameter of the cylinder and the distance between the light source and the light guide rod. Specifically, if the diameter of the light guide rod is increased, the light reaching the rough surface structure is reduced. Therefore, the rear outgoing area is increased to facilitate the rear outgoing light, and the front outgoing light is adjusted by increasing the transmittance of the reflecting portion.

  The present invention is not limited to the embodiments described above. That is, various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[Embodiment 4]
In Embodiment 4, lighting equipment using the lighting device 1 described in Embodiments 1, 2, and 3 will be described. The lighting device 1 of the present invention has been studied as an alternative to incandescent bulbs. Then, if it is lighting equipment using an incandescent lamp, it can be set as illumination similarly to an incandescent lamp by using this illuminating device. Illuminating equipment includes a configuration in which nothing is provided around the incandescent bulb, a configuration in which a design is provided, and a configuration in which a reflector having a reflecting surface is provided. The incandescent bulb has a structure in which light from the filament is radiated in all directions, but the illumination device of the present invention is also a cylindrical light guide member, for example, traveling light and reflected light propagating through the light guide member Can be controlled by the light extraction structure provided around the light guide member, so that the light distribution characteristic similar to that of the incandescent light bulb can be obtained.

  Therefore, even if it is attached to a lighting device having a configuration in which nothing is provided in the periphery or a configuration having a design property, the same illumination can be obtained. This can irradiate light behind the lighting device, so that the entire room can be kept bright and a comfortable space can be obtained. Moreover, it is possible to obtain the same illumination even if it is attached to an illumination device having a structure provided with a reflector.

  Furthermore, even with other lighting devices not described here, the lighting device of the present invention can have a light distribution similar to that of an incandescent light bulb. I can do it. Moreover, if it is another illuminating device, it can apply to any illuminating device by making the optical function surface and light extraction structure which were provided in the light guide member correspond to an illuminating device.

  INDUSTRIAL APPLICABILITY Since the light emitted from a light emitting element such as an LED can have a light distribution characteristic like an incandescent bulb by a light guide, the present invention can be widely used for lighting devices.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light source module 2a Light emission part 3 Light guide member 3a 1st end part 3b 2nd end part 3c Side surface 4 Base 5 Light extraction structure (5a, 5b, 5c, 5d, 5e)
6 Optical functional surfaces A, C, D Traveling light B Reflected light

Claims (7)

  A light guide member having a first end for allowing light to enter and a second end facing the first end, and having an optical functional surface at the second end, A light guide member having a light extraction structure on a side surface adjacent to the first end portion and the second end portion, wherein the optical functional surface transmits a part of the light beam and reflects the remaining light beam.   A light source module and an illumination device that is disposed to face the light emitting unit of the light source module and includes a light guide member that propagates light rays of the light source module, and that illuminates with light emitted from the light guide member, It has a light functional surface at the second end opposite to the first end close to the light emitting portion, and a light extraction structure on the side surface adjacent to the first end and the second end. A lighting device characterized by the above.   The said optical function surface is a surface which permeate | transmits some light rays among the light rays of the said light source module which propagates the said light guide member, and reflects the remaining light rays. Lighting device.   In the light extraction structure, out of the light beams of the light source module propagating through the light guide member, the light beams in the same direction as the light emitted from the light emitting unit of the light source module and the light beams reflected by the optical functional surface are transmitted to the outside. The illumination device according to claim 2, wherein the illumination device has a structure for taking out and emitting.   The light extraction structure includes a first light extraction structure provided on a side surface close to the first end of the light guide member and a second light extraction structure provided on a side surface close to the second end of the light guide member. The first light extraction structure extracts the light beam in the same direction as the light emitted from the light emitting portion of the light source module to the outside of the light guide member, and the second light extraction structure includes: The illumination device according to claim 2, wherein the light beam reflected by the optical functional surface is extracted outside the light guide member.   The lighting device according to claim 2, wherein the optical functional surface has a shape recessed toward the inside of the light guide member.   An illumination apparatus comprising the illumination device according to claim 2.