JP2012226965A - Illumination apparatus and illumination equipment equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination apparatus that is improved in light utilization efficiency by raising coupling efficiency from a light source to a light guide plate without accompanying the processing of the light guide plate, and easily assembled.SOLUTION: The illumination apparatus includes a flat-plate light guide plate and the light source, and irradiates emitting light from the light source as the direct illumination light from the front face side of the light guide plate, by guiding inside the light guide plate. Further, the illumination apparatus has a frame 20 installed surrounding the surroundings of the light guide plate, and the frame 20 is constructed of a plurality of frame pieces 20A, 20B which are mutually insertion engaged.

Description

  The present invention relates to an illumination device that emits light from a light source in a planar shape by a light guide plate, and an illumination device including the illumination device.

  Conventionally, in an illuminating device, an LED (Light Emitting Diode) capable of saving energy by using low power consumption and low heat generation is used instead of an incandescent bulb. That is, since much of the supplied power is used for light emission, that is, the light emission efficiency is high, the LED lighting requires less power to produce the same brightness as the conventional incandescent lighting. In addition, the low power consumption is characterized by the fact that less heat is generated for the power that has been lost as heat in the prior art, and the lighting apparatus has a low heat generation.

  In recent years, lighting fixtures using LEDs have emerged not only for LED bulbs that replace incandescent bulbs but also for ceiling lights that are fixed to the ceiling.

  For example, Patent Literature 1 discloses a lighting fixture that can illuminate a ceiling surface by emitting light toward the side and back of the fixture body using LEDs.

  The lighting fixture 100 disclosed in Patent Document 1 is a ceiling-mounted ceiling light for residential use. As shown in FIGS. 18 (a) and 18 (b), the fixture main body 110 and the front surface of the fixture main body 110 are provided. And a light-transmitting cover 101 that covers the side surfaces, and a light control body 102 that emits light from the peripheral edge portion 101a of the light-transmitting cover 101 toward the side and back of the instrument main body 110.

  And the instrument main body 110 is equipped with the light emitting module 120 which has several LED, and the lighting device 111 which lights LED. As shown in FIGS. 18C and 18D, the light emitting module 120 includes a base 121, a plurality of light emitting sections 122a mounted on the base 121, and yellow fluorescence excited by the light emitting sections 122a. And a semiconductor light emitting element 122 configured to emit white light with high luminance and high output.

  With this configuration, it is possible to provide a lighting fixture 100 that can radiate light toward the side and back of the fixture main body 110 to brighten the ceiling surface.

  By the way, in this kind of lighting fixture 100, since the several light emitting module 120 is arranged side by side on the substantially whole surface of a ceiling light, the number of the semiconductor light emitting elements 122 increases and it becomes high cost.

  In order to solve this problem, for example, Patent Document 2 discloses a technique used for a backlight of a liquid crystal display device.

  As shown in FIG. 19, the backlight 200 for a display device disclosed in Patent Document 2 is provided with a light emitting diode 201 below the light guide plate 210 so that its optical axis is orthogonal to the light guide plate 210. . Then, immediately above the light emitting diode 201 on the surface of the light guide plate 210, curved reflecting surfaces 211 and 211 are formed so as to reflect light from the light emitting diode 201 toward both ends of the light guide plate 210. A reflective sheet 202 is provided below the light emitting diode 201.

  With the above configuration, the number of the light emitting diodes 201 can be reduced because the light emitting diodes 201 need only be disposed on the center line of the light guide plate 210.

  Furthermore, Patent Document 3 discloses a lighting fixture that includes a ceiling light that performs planar irradiation by a combination of a linear light source and a mirror. In the illuminating device disclosed in Patent Literature 3, light is emitted from a light source provided at an outer edge portion of the instrument body toward a curved mirror on the center side, and is reflected by reflecting the light.

JP 2010-140797 A (published on June 24, 2010) JP 2006-49324 A (published February 16, 2006) JP 2009-9898 A (released on January 15, 2009)

  However, in the display device backlight 200 disclosed in the above-described conventional Patent Document 2, the light guide plate 210 must be formed with reflecting surfaces 211 and 211 having curved surfaces. Therefore, since the light guide plate 210 has to be processed, the cost increases, and in particular, the processing of the large light guide plate has a problem that the area is large and difficult.

  Further, in the backlight 200 for a display device disclosed in Patent Document 2, the amount of light emitted to the liquid crystal panel side is too large immediately above the light emitting diode 201 in the light guide plate 210, so that the entire light guide plate is uniformly irradiated. Has the problem of being difficult.

  In addition, the illumination device disclosed in Patent Document 3 has a problem that the thickness of the device increases due to the use of a curved mirror.

  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 illumination device that enables uniform irradiation over the entire light guide plate without increasing the number of light sources and processing the light guide plate. And providing a lighting device including the same.

  In order to solve the above-described problems, an illumination device according to the present invention includes a flat light guide plate and a light source disposed on the back side of the light guide plate, and the light emitted from the light source is incident on the light guide plate. An illumination device that irradiates the incident light from the surface side of the light guide plate while totally reflecting the light inside the light guide plate and guiding the light obliquely to the light guide plate. An optical coupling member that couples light emitted from the light source is provided between the light guide plate and the light source, and an outer frame surrounding the periphery of the light guide plate is provided, and the outer frames are fitted to each other. It is characterized by comprising a plurality of outer frame pieces.

  In the illuminating device of the present invention, the light source and the optical coupling member are disposed on the back side of the flat light guide plate, and the optical coupling member transmits the light emitted from the light source to the flat light guide plate. The light is combined so that it is incident obliquely. For this reason, the light emitted from the light source arranged on the back side of the light guide plate is coupled to the light guide plate through the optical coupling member and is incident obliquely, and the end of the light guide plate is totally reflected inside the light guide plate. On the way, the total reflection condition is broken by the optical path conversion element, and the light is irradiated from the surface side of the light guide plate.

  As a result, unlike the conventional side-edge type light guide plate, the backlight is directly under the light guide plate, so that the frame size can be reduced. In addition, since the gap between the light source and the light guide plate for avoiding the thermal expansion required in the side edge type light guide plate is not required, the coupling efficiency from the light source to the light guide plate is increased and the light utilization efficiency is improved. be able to.

  Also, in the present invention, by providing a light coupling member separate from the light guide plate, light is incident on the flat light guide plate at an angle, so that the incident light is guided while being totally reflected inside the light guide plate. To be lighted. As a result, the incident light from the light source can be guided inside the light guide plate via the optical coupling member without processing the light guide plate.

  Therefore, it is possible to provide an illuminating device that can increase the coupling efficiency from the light source to the light guide plate and improve the light utilization efficiency without processing the light guide plate.

  Furthermore, in the illuminating device of the present invention, an outer frame surrounding the periphery of the light guide plate is provided, and the outer frame is composed of a plurality of outer frame pieces that fit together. Thereby, when assembling the illuminating device of this invention, an outer frame can be attached only by fitting and fastening several outer frame piece. Therefore, assembly of the lighting device is facilitated.

  In addition, the outer frame is configured by two outer frame pieces that are fitted together, and these outer frame pieces may be sandwiched from both sides in one direction within the surface of the light guide plate. .

  In the illuminating device of the present invention, a heat radiating plate for holding the light guide plate and radiating the heat emitted from the light source is provided on the rearmost side, and each outer frame piece is fixed to the heat radiating plate. It is preferable that a fixing part is provided.

  According to the above configuration, the back surface is provided with a heat radiating plate for holding the light guide plate and radiating heat generated from the light source, and each outer frame piece is fixed to the heat radiating plate. A fixing part is provided for this purpose. Therefore, when assembling the lighting device, the frame pieces can be fitted and fastened together, and at the same time, the outer frame can be fixed to the heat dissipation plate via the fixing portion. Therefore, according to said structure, the assembly of an illuminating device becomes still easier.

  In the illuminating device of the present invention, the heat radiating plate is missing at the outer peripheral edge of the light guide plate, and the outer frame has a back-side holding portion extended so as to cover a portion exposed by the defect. preferable.

  According to said structure, since the said heat sink is missing | missed in the outer peripheral edge part of the said light-guide plate, the weight reduction of an illuminating device is realizable. Furthermore, since the outer frame has a rear surface side holding portion extended so as to cover a portion exposed by the defect, it is possible to prevent dust, insects, and the like from adhering to the light guide plate.

  In the illuminating device of the present invention, the outer peripheral edge portion includes a non-surface-side irradiation portion configured to irradiate a part of light incident on the light guide plate in a direction different from the surface side of the light guide plate. Preferably it is.

  According to said structure, the non-surface side irradiation part which irradiates a part of light which injected into the said light-guide plate in the direction different from the surface side of this light-guide plate is comprised by the outer-periphery edge part in the outer periphery part. Therefore, in addition to facilitating the assembly of the lighting device, it is possible to simultaneously realize both space lighting as direct lighting and ceiling lighting as indirect lighting. In the conventional side-edge type light guide plate, the end portion (outer peripheral edge portion) is used as a light incident portion, so that the light extraction function cannot be given to the end portion of the light guide plate.

  The said non-surface side irradiation part may be comprised by the light-transmitting material in the area | region of the said outer frame facing the side surface of the said light-guide plate. In this case, the non-surface side irradiation part may or may not be configured on the outer peripheral edge of the back surface of the light guide plate. Thereby, this invention can be easily comprised by using the flame | frame which has a light extraction function as a non-surface side irradiation part, without processing an illuminating device main-body part.

  In the illuminating device of the present invention, when the incident light is totally reflected inside the light guide plate and guided to the back surface of the light guide plate, the light leaking to the back surface side of the light guide plate is reincident on the light guide plate. A reflection sheet may be provided, and the non-surface-side irradiation unit may be configured by the lack of the reflection sheet at the outer peripheral edge of the back surface of the light guide plate.

  In the above configuration, particularly when the heat dissipation plate is missing at the outer peripheral edge of the light guide plate, and the outer frame has a rear surface side holding portion extended to cover a portion exposed by the loss, In addition to the lighter weight, both space illumination as direct illumination and ceiling illumination as indirect illumination can be realized simultaneously.

  In order to solve the above-described problems, a lighting device according to the present invention includes the above-described lighting device.

  As described above, in the illumination device of the present invention, the light coupling member that couples the light emitted from the light source so that light is incident on the light guide plate obliquely is interposed between the light guide plate and the light source. An outer frame surrounding the periphery of the light guide plate is provided, and the outer frame is configured by a plurality of outer frame pieces that fit together.

  Moreover, the illuminating device of this invention is a structure provided with the said illuminating device as mentioned above.

  Therefore, there is an effect of providing an illuminating device that increases the coupling efficiency from the light source to the light guide plate and improves the light utilization efficiency without processing the light guide plate. Furthermore, the present invention is provided with an outer frame that surrounds the periphery of the light guide plate, and the outer frame is composed of a plurality of outer frame pieces that fit together. The outer frame can be attached simply by fitting and fastening the outer frame pieces. Therefore, assembly of the lighting device is facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a lighting device in a ceiling light as a lighting device according to an embodiment of a lighting device including a lighting device according to the present invention. (A) is a perspective view from the surface side which shows the structure of the said ceiling light, (b) is a perspective view from the back surface side which shows the structure of the said ceiling light. It is a perspective view which shows the structure of the light source module in the said illuminating device. (A) is sectional drawing which shows an optical path when the light radiate | emitted from the light emission part injects into a light-guide plate via the optical coupling member which has a paraboloid, (b) is the principal part which shows the optical path near a light emission part It is sectional drawing. (A) is sectional drawing which shows the optical path when the light radiate | emitted from the light emission part injects into a light-guide plate via the optical coupling member which has an elliptical surface, (b) is principal part cross section which shows the optical path near a light emission part. FIG. (A) is sectional drawing which shows the optical path when the light radiate | emitted from two light emission parts injects into a light-guide plate through the optical coupling member which has a paraboloid and an elliptical surface, and radiate | emits from the surface side of a light-guide plate. (B) is a perspective view which shows the strip | belt-shaped light source module provided in the back surface of the light-guide plate. (A) is a top view which shows the said light-guide plate, (b) is a graph which shows the luminance distribution on the string which passes along point A * B of (a). It is a top view which shows the total reflection conditions in the outer periphery of the light-guide plate which consists of a disk in the light which injected into the light-guide plate from the said light source module. (A) shows the structure of the modification of the said light-guide plate, Comprising: It is a top view which shows a rectangular light-guide plate, (b) is a top view which shows the light-guide plate which chamfered the rectangular corner | angular part, (C) is a top view which shows an elliptical light-guide plate, (d) is a top view which shows a rhombus-shaped light-guide plate. It is a perspective view which shows the structure of the modification of the light source module in the said illuminating device, Comprising: A frame-shaped light source module. It is sectional drawing which shows the toning illumination in the said illuminating device. The structure of the illuminating device provided with the characteristic structure of this invention is shown, (a) is a top view which shows the state from which the flame | frame was isolate | separated, (b) is a top view which shows the state to which the flame | frame was attached. is there. It is sectional drawing which shows the other modification of the illuminating device shown in FIG. 12 shows still another modified example of the lighting device shown in FIG. 12, (a) is a cross-sectional view, (b) is a top view showing a state in which the frame is separated, and (c) is a frame attached. It is a top view which shows a state. BRIEF DESCRIPTION OF THE DRAWINGS It shows one form of the illuminating device in this invention, Comprising: (a) is a front view from the back surface which shows the structure of the principal part of a illuminating device, (b) is the structure of the principal part of a illuminating device. FIG. (A)-(e) is sectional drawing which shows one Embodiment of a structure of the principal part of the illuminating device in this invention. (A)-(d) is sectional drawing which shows one Embodiment of a structure of the principal part of the illuminating device in this invention. (A) is sectional drawing which shows the structure of the conventional lighting equipment, (b) is a top view which shows the structure of the lighting equipment, (c) is sectional drawing which shows the structure of the illuminating device in the lighting equipment. (D) is a plan view showing the configuration of the illumination device. It is a cross section which shows the structure of the backlight applied to the conventional liquid crystal display device.

(1) Basic configuration of the present invention An embodiment of the present invention will be described below with reference to FIGS. Note that the illuminating device and the illuminating equipment including the illuminating device described here are the basic configuration of the present invention, and the characteristic configuration of the present invention to be described later can be applied.

  A configuration of a ceiling light as a lighting device including the lighting device of the present embodiment will be described with reference to FIGS. 1, 2 (a) to 2 (b), and FIG. 3. FIG. 1 is a cross-sectional view showing a configuration of a main part of a lighting device in a ceiling light, FIG. 2 (a) is a perspective view showing the configuration of the ceiling light, and FIG. 2 (b) is a ceiling light. FIG. 3 is a perspective view from the rear surface side showing the configuration of FIG. 3, and FIG. 3 is a perspective view from the front surface side showing the configuration of the light source module. In the present specification, unless otherwise specified, the “front surface” direction is the direction of the light irradiation surface in the lighting device of the present invention, the “back surface” direction is the opposite direction, and the “side surface” direction is The direction is orthogonal to both the front surface direction and the back surface direction. That is, when the lighting device of the present invention is installed as a ceiling light on the ceiling, the “front surface” is the room (floor) side, and the “back surface” is the ceiling side.

  As shown in FIG. 2A, the ceiling light 1 includes, for example, a disk-shaped lighting device 10, and the disk-shaped lighting device 10 includes a frame 20 on the outer periphery thereof. On the back surface of the ceiling light 1, as shown in FIG. 2B, a light source module 30 is provided on the diameter of the disk. The diameter of the ceiling light 1 is, for example, 550 mm, and the thinnest part is, for example, 10 mm. In addition, about the shape and each dimension of the ceiling light 1, it is not restricted to this.

  As shown in FIG. 1, the lighting device 10 of the ceiling light 1 includes a diffusion sheet 11, a gap 12, a light guide plate 13, and a light source module 30 that are provided in this order from the front side. A portion of the back surface of the light guide plate 13 where the light source module 30 is not provided is provided with a reflection sheet 14 and a back chassis 15 that are openings.

  In other words, the illumination device 10 is provided with the back chassis 15, the reflection sheet 14, the light guide plate 13, and the diffusion sheet in order from the back surface side to the front surface side in a portion where the light source module 30 is not provided. . The back chassis 15, the reflection sheet 14, and the light guide plate 13 are stacked and provided, and the diffusion sheet 11 is provided separately from the light guide plate 13. As a result, a gap 12 is formed between the diffusion sheet 11 and the light guide plate 13. Note that a prism sheet may be provided in the gap 12 so as to be in contact with both the diffusion sheet 11 and the light guide plate 13.

  As shown in FIG. 3, the light source module 30 is provided with a sheet-like heat sink 32 on a light source holder 31 formed in a strip shape. On the heat sink 32, for example, an LED as a light source is provided. (Light Emitting Diode) LED substrates 34a and 34b on which light emitting portions 33a and 33b (see FIG. 1) each composed of a chip and a phosphor are mounted are provided. Spacers 36a and 36b are formed on the LED boards 34a and 34b to provide a gap between the LED boards 34a and 34b and the optical coupling member 35 described later. Due to this gap, it is possible to prevent the optical coupling member 35 from coming into contact with the light emitting portions 33a and 33b and damaging the light emitting portions 33a and 33b. However, the present invention is not limited to this, and the light emitting units 33a and 33b may be in close contact with the optical coupling member 35 as long as the light emitting units 33a and 33b are not damaged. Since the semiconductor light emitting part has a very fine size, the description of the light emitting part is omitted in FIG. 3 in order to prevent the drawing from being complicated. Moreover, in this Embodiment, although the light emission parts 33a * 33b are used as a light source, it is not necessarily this, For example, it is also possible to use an organic EL light emitting element or an inorganic EL light emitting element.

  Here, in the present embodiment, the light emitting units 33a and 33b are a combination of a blue LED chip and a yellow phosphor, a combination of a blue LED chip, a red phosphor and a green phosphor, a blue LED chip, a red LED chip and a green LED. It is composed of a combination of chips, an organic EL element and the like. Further, the light emitting units 33a and 33b emit light having a color temperature of 2000K to 6000K. That is, red light in the morning sun or sunset has a color temperature of about 2000K, and sunlight has a color temperature of about 5000K to 6000K. In addition, in the light source used with the backlight of a liquid crystal display device, the light emission part of color temperature 10000K-20000K is used, for example.

  A plurality of the light emitting portions 33a and 33b are provided in parallel in two rows, and an optical coupling member 35 is provided above the light emitting portions 33a and 33b.

  Here, the arrangement direction of the light emitting units 33a and 33b is the Y-axis direction, and the normal direction of the light guide plate 13 is the Z-axis direction. A direction perpendicular to both the Y-axis direction and the Z-axis direction is taken as an X-axis direction. The X-axis direction is the width direction of the strip-shaped optical coupling member 35, and the Y-axis direction is the longitudinal direction of the strip-shaped optical coupling member 35.

  That is, as shown in FIG. 1, the ceiling light 1 of the present embodiment includes a light guide plate 13 that irradiates light on the surface side, a light coupling member 35 as an optical element that couples light to the light guide plate 13, and the above The light coupling member 35 includes light emitting portions 33a and 33b that emit incident light, and the light guide plate 13, the light coupling member 35, and the light emitting portions 33a and 33b are arranged in this order from the front surface side to the back surface side of the lighting device 10. It consists of what is arranged. Therefore, the illuminating device 10 in the ceiling light 1 of the present embodiment is a illuminating device 10 directly under the light source in which the light emitting portions 33 a and 33 b are provided on the back side of the light guide plate 13.

  Here, in this embodiment, as shown in FIGS. 4 (a) and 4 (b), the optical coupling member 35 is a belt having a substantially semi-cylindrical cross section provided between the light guide plate 13 and the light emitting portions 33a and 33b. It consists of a rod-shaped body having a substantially U-shaped cross section. The material of the optical coupling member 35 is made of the same resin as that of the light guide plate 13. If the same material is used, the refractive index can be made the same, so that light is smoothly incident on the light guide plate 13 from the optical coupling member 35. The refractive index of the light guide plate 13 may be slightly higher than the refractive index of the optical coupling member 35. Further, the material is not limited to resin, and a material such as glass may be used. In addition, by forming a side wall (not shown) with a white resin or the like around the light emitting portions 33a and 33b and performing light distribution control, the coupling efficiency to the optical coupling member 35 can be improved.

  Specifically, as shown in FIG. 4A, the optical coupling member 35 has a surface on the light guide plate 13 side of the optical coupling member 35, and a top flat surface 35 a that abuts the flat light guide plate 13. It has a shape having curved surfaces 35b and 35c on both ends from the top flat surface 35a.

  The curved surfaces 35b and 35c can be, for example, a cross-sectional parabola shown in FIG. However, the present invention is not necessarily limited to this, and as shown in FIGS. 5A to 5B, the cross section may be an ellipse. In addition, a curved shape such as an arch shape, or obliquely from the top flat surface 35 a. Even if it is a plane inclined in a straight line, any shape that can effectively couple light to the light guide plate may be used.

  The surface of the optical coupling member 35 opposite to the light guide plate 13 side, that is, the lower end of the optical coupling member 35 is a lower flat surface 35d as shown in FIG. The spacers 36a and 36b are formed, and serve as spacers that prevent the light emitting portions 33a and 33b and the optical coupling member 35 from colliding with each other. The light emitting portions 33a and 33b are bonded to the LED substrates 34a and 34b, respectively. The spacers 36a and 36b are adhesively fixed to the LED boards 34a and 34b by applying an adhesive or the like. As shown in FIGS. 4A and 4B, the light emitting portions 33a and 33b are formed with a slight gap between the light coupling members 35, but the light emitting portions 33a and 33b are not limited thereto. The light emitting portions 33a and 33b may be in close contact with the optical coupling member 35 as long as they do not damage the light.

  In addition, a concave portion 35e is formed in the central portion on the lower end side of the optical coupling member 35. However, the configuration is not limited to this, and the concave portion 35e may not be present, and the optical coupling member 35 may have a substantially semicircular cross section. That is, in the present embodiment, it is only necessary to secure an optical path to the light guide plate 13 for the light reflected by the curved surfaces 35b and 35c. Therefore, a portion that does not become the optical path can be cut out as a recess 35e. Thereby, cost reduction and weight reduction can be achieved. It is also possible to provide a reflection means such as a reflection sheet (not shown) in the recess 35e. Thereby, even if stray light may be generated in the vicinity of the top flat surface 35a, a part of the stray light can be reflected to the light guide plate 13 side to improve irradiation on the surface side.

  Light emitting portions 33a and 33b are provided close to the optical coupling member 35 on the lower side (back side) of the lower flat surfaces 35d and 35d of the optical coupling member 35, respectively. As shown in FIGS. 4B and 5B, these light emitting portions 33a and 33b are present on the end side (side surface side) from the focal position F of the curved surfaces 35b and 35c having a cross-section parabola or a cross-section ellipse. It is preferable to do. Thereby, for example, as shown in FIG. 4A, for example, the light emitted from the light emitting portion 33 a is reflected by the curved surface 35 b of the parabolic parabola of the optical coupling member 35, and the reflected light is the top of the optical coupling member 35. It reaches the flat surface 35a and enters the light guide plate 13 obliquely while maintaining the arrival direction. Then, the light incident on the light guide plate 13 is reflected by the inside of the right side of the light guide plate 13 shown in FIG. The angle of traveling through the light guide plate 13 is changed by colliding with the light scatterer, the total reflection condition is broken, the light is emitted from the light guide plate 13, reflected by the reflection sheet 14, and further passed through the light guide plate 13. The light emitted from the surface of the light guide plate 13 is emitted from the ceiling light 1 through the diffusion sheet 11. Note that the light emitted from the light emitting unit 33b also proceeds symmetrically with the light from the light emitting unit 33a, as shown in FIG. That is, FIG. 6A schematically shows how the light from the left and right light emitting portions 33a and 33b passes through the optical coupling member 35, enters the light guide plate 13, and propagates through the interior thereof. is there.

  Such an optical path is the same in the optical coupling member 35 having an elliptical cross section shown in FIGS.

  Thus, by making the shape of the curved surfaces 35b and 35c in the optical coupling member 35 into a cross-sectional parabola or a cross-sectional ellipse, the light emitted from the light emitting portions 33a and 33b is reflected by the curved surfaces 35b and 35c having a cross-sectional parabola or a cross-sectional ellipse. Thus, the light can be efficiently combined and incident on the light guide plate 13 from the top flat surface 35a, and the illumination light can be emitted from the ceiling light 1 as shown in FIG. Incidentally, in the comparison between the cross-section parabola and the cross-section ellipse, the cross-section ellipse can be coupled so that the light is focused and incident on the light guide plate 13, so that the coupling efficiency can be increased.

  As a result, in the illuminating device 10 in the ceiling light 1 of the present embodiment, as shown in FIG. 6B, a strip-shaped light source module 30 is provided across the center of the disk-shaped ceiling light 1, that is, on the center line. ing. As a result, as shown in FIG. 7 (a), the luminance distribution shown in FIG. 7 (b) in a string passing through points A and B that are about ± 1/3 of the radius in the X-axis direction from the center of the light guide plate 13. The light emitted from the light guide plate 13 having the above can be obtained. As a result, the ceiling light 1 of the present embodiment can obtain a uniform and smooth luminance distribution.

  Here, the luminance distribution of the disk-shaped ceiling light 1 in the present embodiment will be described.

  That is, in the present embodiment, as shown in FIG. 8, in the disc-shaped light guide plate 13, the light P emitted from the light source module 30 provided on the center line reaches the outer peripheral end 13a. Here, since the light guide plate 13 of the present embodiment is made of, for example, an acrylic plate, the radial direction (normal direction to the tangent line Q) at the outer peripheral end 13a is orthogonal to the light source module 30 according to Snell's law. The angle θ formed by the direction is divided into a region S1 that is not totally reflected and regions S2 and S2 that are totally reflected with a boundary of about 42 degrees. The region S1 that is not totally reflected is a central side portion of the diameter, and the regions S2 and S2 that are totally reflected are both side portions of the diameter. For this reason, in the present embodiment, the brightness of the entire light guide plate 13 is further uniformed by adjusting the arrangement pattern of the light scattering portion which is an optical path conversion element (not shown).

  Moreover, in the illuminating device 10 of this Embodiment, as shown in FIG. 1, the light of light emission part 33a * 33b is entered from the back surface side of the light-guide plate 13. As shown in FIG. Here, in the backlight field of the liquid crystal display device, a side edge type backlight has been conventionally used. However, the light utilization efficiency of the conventional side edge type backlight is 75%. The light use efficiency of the lighting apparatus 10 of the present embodiment was 88%. Thus, it turns out that the illuminating device 10 of this Embodiment is excellent in light utilization efficiency rather than the conventional side edge type | mold backlight. That is, in the conventional side edge type backlight, since the linear expansion accompanying the temperature rise in the longitudinal direction of the light guide plate is large, it is necessary to provide a gap between the light emitting unit and the light guide plate. Since the emitted light from the light leaks from this gap, the light utilization efficiency could not be increased. In this regard, in the lighting device 10 of the present embodiment, since the light emitting portions 33a and 33b are provided immediately below the light guide plate 13, the expansion dimension is small even when the light guide plate 13 is thermally expanded. Therefore, since it is not necessary to provide a gap, the light utilization efficiency can be increased.

  As a result, in the illumination device 10 of the present embodiment, unlike the conventional side-edge type backlight, there is no light source at the end of the ceiling light 1 as shown in FIG. It is possible to provide the frame 20 directly at the end of the frame. As a result, surface light emission with a frame size of 6 mm or less is possible. Further, by forming the frame 20 from a transparent, translucent or milky white resin material, it is possible to emit light from the entire surface including the frame 20. By optimizing the shape and material of the frame 20, indirect illumination that emits light in the back surface direction is possible.

  By the way, in this Embodiment, although the illuminating device 10 becomes disk shape, for example, it is not necessarily this, As shown to Fig.9 (a)-(d), it can be set as various shapes. . Specifically, FIG. 9A shows a rectangular light guide plate 13, FIG. 9B shows a light guide plate 13 with rectangular corners chamfered, and FIG. 9C shows an elliptic light guide plate 13. FIG. 9D shows a diamond-shaped light guide plate 13.

  In this case, in the rectangular light guide plate 13 shown in FIG. 9A, the light quantity gradually increases in the light guide direction of the light from the light source module 30, that is, in the direction orthogonal to the light source module 30 extending in a strip shape (traveling direction). To decrease. For this reason, the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction. On the other hand, in the direction perpendicular to the light guide direction (vertical direction), the amount of light is constant, and as a result, the distribution of the dot pattern of the light scattering portion is also uniform.

  Further, in the light guide plate 13 whose corners of the rectangle shown in FIG. 9B are chamfered, the rectangular portion is the same as that in FIG. That is, the amount of light gradually decreases in the light guide direction (traveling direction) of light from the light source module 30. For this reason, the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction. In the direction perpendicular to the light guide direction (vertical direction), the amount of light is constant, and as a result, the dot pattern distribution in the light scattering portion is also uniform.

  On the other hand, in the chamfered portion of the rectangular corner, the light is totally reflected in the direction perpendicular to the light guide direction (vertical direction). As a result, in order to obtain a uniform luminance distribution from the light guide plate 13 to the surface side. Needs to reduce the dot pattern of the light scattering portion as it proceeds in the vertical direction.

  Furthermore, in the elliptical light guide plate 13 shown in FIG. 9C, the light quantity gradually decreases in the light guide direction (traveling direction) of the light from the light source module 30. For this reason, the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction. On the other hand, in the direction perpendicular to the light guide direction (vertical direction), the light is totally reflected. As a result, in order to obtain a uniform luminance distribution from the light guide plate 13 to the surface side, the light proceeds in the vertical direction. Accordingly, it is necessary to reduce the dot pattern of the light scattering portion.

  Moreover, in the rhombus-shaped light guide plate 13 shown in FIG. 9D, the amount of light gradually decreases in the light guide direction (traveling direction) of the light from the light source module 30. For this reason, the distribution of the dot pattern of the light scattering portion can obtain a uniform luminance distribution from the light guide plate 13 to the surface side by increasing the number of dot patterns as it goes in the traveling direction. On the other hand, in the direction perpendicular to the light guide direction (vertical direction), the light is totally reflected. As a result, in order to obtain a uniform luminance distribution from the light guide plate 13 to the surface side, the light proceeds in the vertical direction. Accordingly, it is necessary to reduce the dot pattern of the light scattering portion.

  In addition, in this Embodiment, although the light source module 30 of the illuminating device 10 is provided in strip | belt shape, it does not necessarily restrict to this. For example, as shown in FIG. 10, it can be a ring shape that is a frame shape. Thus, by using the frame-shaped light source module 30 that follows the shape of the illumination device 10, it is possible to easily achieve uniform luminance.

  Further, in the light source module 30 of the present embodiment, as described above, the light source module 30 is provided with two rows of light emitting portions 33 a and 33 b along the longitudinal direction of the optical coupling member 35. Therefore, by adjusting the color temperatures of the light emitting sections 33a and 33b in the two rows, as shown in FIG. 11, dimming and toning illumination can be performed. Specifically, the light emitting unit 33a is daylight white and the light emitting unit 33b is a light bulb color. Thereby, it is possible to perform dimming and toning illumination such as irradiating daylight white light outside the ceiling light 1 and illuminating a light bulb color inside the ceiling light 1.

  Further, in the present embodiment, the light source modules 30 are provided in one row, but the present invention is not limited to this, and a plurality of light source modules 30 may be provided. Thereby, improvement in brightness and dimming illumination are possible.

  Thus, in the illuminating device 10 of this Embodiment, between the light guide plate 13 and the light emission parts 33a * 33b, light is incident on the light guide plate 13 from the light emission parts 33a * 33b so as to enter obliquely. An optical coupling member 35 that couples the emitted light is provided. Therefore, the light emitted from the light emitting portions 33a and 33b on the back surface of the light guide plate 13 is coupled to the light guide plate 13 through the optical coupling member 35 and is incident obliquely, and is guided while being totally reflected inside the light guide plate 13. The light travels to the end of the light plate 13, and the total reflection condition is broken at the light scattering portion which is an optical path conversion element, and the light is emitted to the surface side of the light guide plate 13.

  As a result, it is possible to irradiate light from the entire surface of the light guide plate 13 simply by arranging the light emitting portions 33 a and 33 b along the back surface of the optical coupling member 35. As a result, the number of the light emitting parts 33a and 33b can be reduced as compared with the case where the light emitting parts 33a and 33b are arranged on the entire back surface of the light guide plate 13.

  In the present embodiment, by providing a light coupling member 35 that is separate from the light guide plate 13, light is incident obliquely on the flat light guide plate 13 and totally reflected inside the light guide plate 13. Can be guided to the whole. As a result, even without processing the light guide plate 13, incident light from the light emitting portions 33 a and 33 b is guided inside the light guide plate 13 through the optical coupling member 35, and light is uniformly emitted from the light guide plate 13. Can be irradiated.

  Further, in the present embodiment, the light emitting units 33 a and 33 b are arranged so that the optical axis direction of the emitted light toward the optical coupling member 35 is orthogonal to the light guide plate 13. For this reason, since it is not necessary to arrange the light emitting portions 33a and 33b obliquely with respect to the flat light guide plate 13, the light emitting portions 33a and 33b can be easily arranged and the structure is simple.

  In the present embodiment, the light emitting units 33a and 33b emit light having a color temperature of 2000K to 6000K. For this reason, it can be appropriately used as an illumination device such as the ceiling light 1.

  Therefore, it is possible to provide the lighting device 10 that enables uniform irradiation of the entire light guide plate 13 without increasing the number of the light emitting units 33a and 33b and processing the light guide plate.

  Moreover, in this Embodiment, it is not necessary to process the light-guide plate 13, and since light injects from the downward direction, the light-guide plate 13 and the ceiling light 1 can be reduced in thickness. Specifically, a certain amount of thickness is required for processing the light guide plate 13. In this case, for example, when an edge light type light guide plate is considered, if the light guide plate 13 is made thinner than the widths of the light emitting portions 33a and 33b, the optical coupling rate is lowered, so that there is a limit to thinning. In this regard, in the present embodiment, if the light guide plate 13 is thinned, the ceiling light 1 is thinned. Moreover, since the material of the light guide plate 13 can be saved, the cost can be reduced. Further, since the light emitting portions 33a and 33b may be mounted so that the optical axis thereof is perpendicular to the light guide plate 13, the assembly is simple. That is, in the case of the conventional edge light, since it is necessary to attach the light emitting parts 33a and 33b from the side surfaces, the manufacture becomes somewhat difficult.

  Moreover, in the illuminating device 10 of this Embodiment, the optical coupling member 35 is provided in strip | belt shape.

  This eliminates the need for the relationship between the optical coupling member 35 and the light emitting portions 33a and 33b to be 1: 1, and covers the plurality of light emitting portions 33a and 33b with one optical member, thus simplifying the structure of the optical system. can do. In addition, since the light emitting portions 33a and 33b can be provided along the optical coupling member 35, wiring of the light emitting portions 33a and 33b is facilitated.

  In the configuration in which the optical coupling member 35 is provided in a strip shape, the optical coupling member 35 may be a double row. In this case, in particular, it is preferable to arrange them symmetrically with respect to the vertical or horizontal center line of the light guide plate 13 so that the luminance distribution of the double-row optical coupling members 35 is symmetrical. Further, when the optical coupling members 35 are in a double row, the luminance of light emitted from the surface of the light guide plate 13 is such that the luminance at the center of the flat light guide plate 13 is higher than the luminance at the end of the light guide plate 13. It is desirable to arrange in.

  Moreover, in the illuminating device 10 of this Embodiment, the optical coupling member 35 is provided on the centerline of the vertical or horizontal direction in the flat light-guide plate 13. As shown in FIG. This makes it possible to make the luminance symmetric about the vertical or horizontal center line of the light guide plate 13 as an axis. Therefore, it is possible to provide the lighting device 10 suitable for the luminance distribution.

  Moreover, in the illuminating device 10 of this Embodiment, the light source consists of several light emission part 33a * 33b. As a result, the light emitting units 33a and 33b have lower power consumption and lower heat generation than incandescent bulbs, and can save energy.

  Furthermore, the ceiling light 1 as the lighting fixture of the present embodiment includes a lighting device 10. Thereby, the ceiling light 1 provided with the illuminating device 10 which enables uniform irradiation in the whole light-guide plate 13 without the increase in the number of light emission parts 33a * 33b and the process of the light-guide plate 13 can be provided. .

  In the illumination device 10 of the present embodiment, a back chassis 15 that is a flat chassis that holds the light guide plate 13 in a flat surface is provided below the light guide plate 13, and the back chassis 15 is guided. The optical plate holding surface has an opening at a portion where the optical coupling member 35 contacts the light guide plate 13, and the optical coupling member 35 and the light emitting portions 33 a and 33 b are positioned below the light guide plate holding surface of the back chassis 15. Yes.

  With such a configuration, only the optical coupling member 35 and the light emitting portions 33a and 33b protrude on the back surface side of the light guide plate 13. Accordingly, it is possible to reduce the thickness of portions other than the optical coupling member 35 and the light emitting portions 33a and 33b. For this reason, the overall thickness can be reduced. Further, by adopting such a configuration, the heat radiation of the light emitting portions 33a and 33b is excellent. Moreover, since the back chassis 15 functions as a heat sink by connecting the light source module 30 to the back chassis 15, high heat dissipation performance can be obtained. As a result, the light emission efficiency of the light emitting units 33a and 33b is also improved.

  In the ceiling light 1 of the present embodiment, the light emitting portions 33 a and 33 b are arranged in two rows along the longitudinal direction of the optical coupling member 35. Specifically, the light emitting units 33a and 33b are provided in two rows in parallel along the center line directly below both ends of the lower end chord in the optical coupling member 35 having a semicircular cross section.

  Thus, when the light is incident on the light guide plate 13, the light emitting portions 33a and 33b of the two rows emit light in opposite directions, so that the line passing through the midpoint between the two rows is axially symmetric and both sides of the optical coupling member 35 That is, the light can be guided to both ends of the light guide plate 13. When the line passing through the midpoint between the two rows coincides with the center line of the light guide plate 13, the light guide plate is guided to both ends of the light guide plate with the center line of the light guide plate 13 being axially symmetrical. A luminance distribution that is axially symmetric about the 13 center lines can be obtained. Therefore, the luminance distribution can be made uniform in the light guide plate 13 with a simple structure. That is, when the light emitting part 33a is used alone, there is a possibility that the light above the light emitting part 33a does not transmit light and becomes a dark part. This can be supplemented with light from the other light emitting section 33b.

  Note that the backlight 200 for a display device disclosed in Patent Document 2 has a problem that the luminance directly above the light emitting diode 201 becomes brighter than the surroundings and bright lines are generated, so that a uniform luminance distribution cannot be created. However, this problem can be solved in the present embodiment.

  Moreover, the illuminating device 10 of this Embodiment can be applied to a large planar light source as it is, and the large ceiling light 1 can also be provided. Furthermore, since no member is required around the light guide plate 13, it can be applied to a larger ceiling light 1 by arranging them seamlessly.

(2) Characteristic Configuration of the Present Invention The illumination device 10 of the present embodiment is characterized by the structure of the frame 20. FIG. 12 shows the configuration of the lighting device 10 having the characteristic configuration of the present invention, FIG. 12 (a) is a top view showing a state where the frame is separated, and FIG. It is a top view which shows the state attached.

  As shown in FIG. 12A, the frame (outer frame) 20 of the illumination device 10 is composed of two frame pieces (outer frame pieces) 20A and 20B. The frame pieces 20A and 20B have fitting portions 20c and 20d, respectively, so as to be fitted to each other. Each of the frame pieces 20A and 20B is provided with a back surface side holding portion 20a that contacts and holds the back chassis 15. A fixing portion (not shown) for fixing to the back chassis 15 is provided on the rear surface side holding portion 20a. The fixing portion has a hook structure for hooking on the back chassis 15. Therefore, when the frame pieces 20A and 20B are attached so that the back chassis 15 comes into contact with the rear surface side holding portion, the frame pieces 20A and 20B are fixed to the back chassis 15 by the hook structure. At the same time, the frame pieces 20A and 20B are fitted and fastened through the fitting portions 20c and 20d.

  In the illuminating device 10, when attaching with the flame | frame 20, the position adjustment and fixing of the flame | frame 20 and the target object which attaches the flame | frame 20 are required, and the subject that attachment of the flame | frame 20 is difficult remains. Therefore, according to the illuminating device 10 shown in FIG. 12, the frame is fixed to the back chassis 15 simply by sandwiching the frame pieces 20A and 20B from both sides in the X-axis direction and fitting and fastening both frame pieces. Therefore, the assembly of the lighting device 10 is facilitated. FIG. 12 shows an example in which the frame 20 includes two frame pieces 20A and 20B, but the number of frame pieces is not limited to this. The number of frame pieces is not limited as long as the frame 20 surrounding the outer periphery of the light guide plate 13 can be formed.

  In the above example, the fixing portion for fixing the frame pieces 20A and 20B to the back chassis 15 has a hook structure. However, the fixing portion is not limited to the hook structure, and may have a structure for fixing to the back chassis 15. The fixing portion can be appropriately changed according to the combination of the constituent material of the frame pieces 20A and 20B and the constituent material of the back chassis 15. For example, when the constituent material of the frame pieces 20A and 20B (or a part thereof) is a resin material, the fixing portion is made of an adhesive that bonds and fixes the frame pieces 20A and 20B and the back chassis 15. Also good. When the constituent material of the frame pieces 20A and 20B (or a part thereof) is a metal material, the fixing portion may be a screw.

  Further, depending on the strength of fastening by fitting the frame pieces 20A and 20B, the frame pieces 20A and 20B may not be provided with a fixing portion, and the frame may be attached only by fitting the frame pieces 20A and 20B. It becomes possible.

  Further, the object to be fastened by fitting the frame pieces 20A and 20B to each other is provided with the optical coupling member 13 that couples the light emitted from the light emitting portions 33a and 33b so that the light is incident on the light guide plate 13 obliquely. The configuration is not particularly limited as long as the configuration is provided between the light guide plate 13 and the light emitting units 33a and 33b. For example, the object may have a configuration in which a gap 12 is formed between the diffusion sheet 11 and the light guide plate 13. FIG. 13 is a cross-sectional view showing another modification of the illumination device shown in FIG.

  As shown in FIG. 13, when the gap 12 is formed between the diffusion sheet 11 and the light guide plate 13, the frame 20 is a U-shaped frame. The frame (outer frame) 20 includes a back surface side holding portion 20a that holds a back surface side portion, and a front surface side holding portion 20b that holds a front surface side portion.

  Specifically, as shown in FIG. 12, the frame 20 is configured such that the rear surface side holding portion 20 a contacts the back chassis 15 and the front surface side holding portion 20 b contacts the diffusion sheet 11. The frame 20 may be made of resin or may be made of metal. The frame 20 is configured such that the back chassis 15 is fixed by the rear surface side holding portion 20a, and the diffusion sheet 11 is held in contact by the front surface side holding portion 20b. When the frame 20 is made of resin, the rear surface side holding portion 20a is fixed to the back chassis 15 with an adhesive. When the frame 20 is made of metal, the rear surface side holding portion 20a is fixed to the back chassis 15 by screwing or the hook structure.

  The object to be fastened by fitting the frame pieces 20 </ b> A and 20 </ b> B may be configured such that the back chassis 15 is missing at the outer peripheral edge of the light guide plate 13. 14 shows still another modified example of the lighting device shown in FIG. 12, FIG. 14 (a) is a cross-sectional view, and FIG. 14 (b) is a top view showing a state in which the frame is separated. 14 (c) is a top view showing a state in which the frame is attached.

  As shown in FIGS. 14A to 14C, at the outer peripheral edge of the lighting device 10, the diffusion sheet 11, the light guide plate 13, the reflection sheet 14, and the back chassis 15 are sequentially arranged from the front surface side to the back surface side. Is provided. The reflection sheet 14 and the back chassis 15 are stacked on the light guide plate 13. On the other hand, the diffusion sheet 11 is spaced apart from the light guide plate 13 to form a gap 12. Thereby, the light emitted from the surface of the light guide plate 13 is scattered by the gap 12 and the uniformity in the direct illumination light can be further improved. Moreover, although the light scattering plate has a dot pattern formed on the light guide plate 13, the presence of the gap 12 can prevent the dot pattern from being visually recognized from the surface side. And the surface side holding | maintenance part 20b in the flame | frame 20 also has a function which supports the diffusion sheet 11 which is not stuck with respect to the light-guide plate 13 so that the space | gap 12 may be maintained.

  In addition, the lighting device 10 has a configuration in which the back chassis 15 is missing at the outer peripheral edge of the light guide plate 13. As shown in FIGS. 14A and 14B, the outer peripheral edge of the reflection sheet 14 is in the same position as the outer peripheral edge of the light guide plate 13. On the other hand, the outer peripheral edge portion of the back chassis 15 is located closer to the center than the outer peripheral edge portion of the reflection sheet 14 (light guide plate 13). That is, the illumination device 10 has a configuration in which the back chassis 15 is missing and the reflection sheet 15 is exposed at the outer peripheral edge. Since the back chassis 15 made of metal is missing as described above, the lighting device can be reduced in weight.

  In the lighting device 10, the rear surface side holding portion 20 a of the frame 20 is fixed to the back chassis 15. Therefore, the back surface side holding portion 20a is configured to extend toward the center side than the front surface side holding portion 20b. This makes it possible to prevent dust, insects, and the like from adhering to the exposed reflection sheet 14 and light guide plate 13.

  In the above example, the frame 20 is a U-shaped frame. However, the frame 20 is not limited to a U-shaped frame, and is not particularly limited as long as it can be attached to the above-described object. For example, the frame 20 may be an L-shaped frame. That is, the frame 20 may be configured without the back side holding part 20a or the front side holding part 20b.

  Moreover, although the illuminating device 10 has a configuration in which the back chassis 15 is missing at the outer peripheral edge portion, the reflective sheet 15 may be further missing. As a result, light can be extracted at the outer peripheral edge, and indirect illumination can be realized. Hereinafter, the configuration of the illumination device 10 capable of indirect illumination will be further described in detail. Even in the illumination device 10 described below, the frame 20 is divided into a plurality of frames that are fitted to each other, thereby providing an effect that the frame can be easily attached.

  In a side-edge type backlight in a conventional liquid crystal display device, a light source is disposed around the light guide plate, and light incident on the light guide plate from the side surface of the light guide plate is taken out from the liquid crystal panel side (front side). In such a backlight, the end portion (outer peripheral edge portion) of the lighting device is used as a light incident portion. In the illumination device 10 of the present embodiment, unlike a conventional side-edge type backlight, there is no light source at the end of the ceiling light 1, so that light can be extracted from the end of the ceiling light 1.

  The illuminating device 10 of this Embodiment is a non-surface side irradiation part (irradiation part) which irradiates a part of light which injected into the light guide plate 13 in the direction different from the irradiation direction in the surface (namely, surface side irradiation part) of the light guide plate 13. (Also referred to as a second irradiating portion) is formed on the outer peripheral edge portion.

  The structure of the outer periphery part of the illuminating device of this Embodiment is shown to Fig.15 (a) and (b). In the illuminating device 10 of this Embodiment, the light extraction area | region 16 to which the reflective sheet 14 is not affixed is formed in the outer peripheral part on the back surface of the light-guide plate 13. FIG. That is, the light extraction region 16 is configured by the reflection sheet 14 being missing at the outer peripheral edge of the back surface of the light guide plate 13. As a result, the light whose total reflection condition is broken is extracted through the light extraction region 16. By having such a configuration, a ceiling light that simultaneously realizes both space illumination as direct illumination and ceiling illumination as indirect illumination is provided. Note that the light extraction region 16 on the back surface of the light guide plate 13 may be provided with a diffusion sheet 11 and a prism sheet 12 in the same manner as the front surface side of the light guide plate 13. Further, a light transmitting member may be disposed and sealed so that dust, insects, and the like do not adhere to the light guide plate.

  FIG. 15B shows an aspect in which the substantially disc-shaped light guide plate 13 and the reflection sheet 14 are concentric circles in the illumination device 10 of the present embodiment, but the shape of the reflection sheet 14 is the same as that of the reflection sheet 14. If the area prescribed | regulated by outer periphery is smaller than the area of the back surface of the light-guide plate 13, it will not specifically limit. The light guide plate 13 and the reflection sheet 14 are preferably similar to each other, and are preferably arranged so that the centers of gravity of the light guide plate 13 and the reflection sheet 14 coincide with each other.

  The second irradiating unit may be configured by providing a frame 20 ′ having the function of the light extraction unit 21 around the light guide plate 13. FIGS. 16A to 16E show the configuration of the peripheral part of the illumination device 10 of the present embodiment in which the frames 20 and 20 ′ are provided on the outer periphery. 16A to 16E illustrate a configuration in which the prism sheet 12 ′ is provided in the gap 12. When the frame 20 ′ having the function of the light extraction unit 21 is used, the reflection sheet is not attached to the side surface of the light guide plate 13. When it is desired to increase the amount of light to the surface side, a half mirror sheet that reflects a part of the light emitted from the side surface of the light guide plate may be attached.

  When light extraction from the side surface of the light guide plate 13 is not necessary, a frame made of a material that does not transmit light (for example, metal) may be used (FIG. 16A). When light extraction from the side surface of the light guide plate 13 is desired, the entire frame 20 ′ may be the light extraction portion 21 made of a light transmissive material (FIG. 16B). When it is desired to irradiate the light extracted from the side surface of the light guide plate 13 toward the ceiling, the light extraction portion 21 may have a tapered cross section to form a prism (FIG. 16C).

  Moreover, the light extraction part 21 may be formed in the part which opposes the side surface of the light-guide plate 13 of frame 20 '(FIG.16 (d)), and the light extracted from the side surface of the light-guide plate 13 in such a structure. When it is desired to irradiate the light toward the ceiling, only the light extraction part 21 needs to be formed in a tapered shape (FIG. 16 (e)).

  Note that when no metal is used for the frame, the lighting device can be reduced in weight and can be easily processed into a desired shape.

  Further, when the reflection sheet is attached to the entire back surface of the light guide plate 13 (when the light extraction region 16 is not formed on the outer peripheral edge of the back surface of the light guide plate 13), the function of the light extraction unit 21 is also used. By using a frame having a ceiling light, a ceiling light that simultaneously realizes both spatial illumination as direct illumination and ceiling illumination as indirect illumination is provided.

  That is, the case where the second irradiating unit is configured only by the frame is also within the scope of the present embodiment. In the illumination device 10 of the present embodiment, a frame 20 ′ having the function of the light extraction unit 21 is provided on the outer periphery of the illumination device 10 (FIGS. 17A to 17D). Also in the present embodiment, the illuminating device includes the diffusion sheet 11, the prism sheet 12 ′, the light guide plate 13, and the light source module 30 in order from the front surface side, and the light source module 30 on the back surface of the light guide plate 13 is provided. A reflection sheet 14 and a back chassis 15 in which a portion of the light source module 30 is an opening are provided in a portion that is not provided. In the illuminating device 10 of this Embodiment, the area | region where the reflection sheet 14 'is not stuck does not exist in the outer periphery part of the light-guide plate 13 back surface. Therefore, there is no light emitted from the back side of the light guide plate 13. However, since the reflection sheet is not provided on the side surface of the light guide plate 13, light can be extracted from the light extraction unit 21 via the side surface of the light guide plate 13.

  As described above, in the illumination device 10 according to the present embodiment, in addition to the surface of the light guide plate 13, the non-surface side irradiation unit that irradiates in a direction different from the irradiation direction on the surface of the light guide plate 13 is configured on the outer peripheral edge. The non-surface-side irradiating portion is composed of at least one of the light extraction region 16 at the outer peripheral edge of the back surface of the light guide plate 13 and the light extraction portion 21 of the frame 20 provided around the light guide plate 13. I can say that. By having such a configuration, a ceiling light that simultaneously realizes both space illumination as direct illumination and ceiling illumination as indirect illumination is provided.

  In addition, when the illuminating device 10 of this Embodiment has the light extraction part 21, even if the diffusion sheet and the prism sheet are provided in the side surface of the light-guide plate 13 similarly to the surface side of the light-guide plate 13. Good. Moreover, the diffusion sheet and the prism sheet may be provided in the light extraction part, and the light extraction part may be subjected to light diffusion processing. The material of the frame may be a metal or a resin as described above, and the resin may have a color that partially transmits light, such as white, or may be transparent. Good. Moreover, you may perform surface treatments, such as a blast process, to a transparent thing. The shape of the frame is not particularly limited as long as it has the above-described function. In the case of metal, an opening having an arbitrary shape for constituting the light extraction portion may be provided. A letter shape or a taper shape may be used.

  The reflection sheet 14 is not particularly limited as long as it has a high reflectance, and can be arbitrarily selected by those skilled in the art. The back chassis 15 may have the same shape and the same size as the reflection sheet 14.

  The ratio of the amount of light used for space illumination and the amount of light used for ceiling illumination is preferably 70:30 to 95: 5, more preferably 80:20 to 90:10. The size can be appropriately changed depending on the area and the arrangement site.

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

  The lighting device of the present invention and the lighting equipment including the lighting device can be applied to ceiling-mounted ceiling lights. And as an application field, it can apply to various lighting fixtures, such as facilities, such as a store and an office, and business.

DESCRIPTION OF SYMBOLS 1 Ceiling light 10 Illuminating device 12 Space | gap 13 Light guide plate 14 Reflective sheet 16 Non-surface side irradiation part (light extraction area)
20 frames (outer frame)
20A frame piece (outer frame piece)
20B frame piece (outer frame piece)
21 Non-surface side irradiation part (light extraction part)
30 Light source module 35 Optical coupling member

Claims (8)

A flat light guide plate, and a light source disposed on the back side of the light guide plate. The light emitted from the light source is incident on the light guide plate, and the incident light is totally reflected inside the light guide plate. An illumination device for irradiating from the surface side of the light guide plate while guiding light,
An optical coupling member that couples light emitted from the light source so that light is incident obliquely on the light guide plate is provided between the light guide plate and the light source;
An illuminating device, wherein an outer frame surrounding the periphery of the light guide plate is provided, and the outer frame is constituted by a plurality of outer frame pieces that are fitted together. The outer frame is composed of two outer frame pieces that fit together,
2. The illumination device according to claim 1, wherein the outer frame pieces are sandwiched from both sides in one direction within the surface of the light guide plate. On the most back side, while holding the light guide plate, a heat radiating plate for radiating heat generated from the light source is provided,
The lighting device according to claim 1, wherein each of the outer frame pieces is provided with a fixing portion for fixing to the heat radiating plate. The heat sink is missing at the outer peripheral edge of the light guide plate,
The lighting device according to claim 3, wherein the outer frame has a rear surface side holding portion extended so as to cover a portion exposed by the defect.   The outer peripheral edge portion includes a non-surface side irradiation portion configured to irradiate a part of light incident on the light guide plate in a direction different from the surface side of the light guide plate. The lighting device according to any one of Items 1 to 4.   The lighting device according to claim 5, wherein the non-surface-side irradiation unit is made of a light-transmitting material in a region of the outer frame that faces a side surface of the light guide plate. On the back surface of the light guide plate, there is provided a reflective sheet for re-entering the light guide plate with the light leaking to the back side of the light guide plate when the incident light is totally reflected inside the light guide plate to guide the light. ,
The illumination device according to claim 6, wherein the non-surface-side irradiation unit is configured such that the reflection sheet is missing at an outer peripheral edge of the back surface of the light guide plate. A lighting device comprising the lighting device according to claim 1.