JP2014120289A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve uniformity of luminance on a light emitting surface.SOLUTION: An incident surface 30 is formed in a shape in which light incident in a predetermined angle range where an angle θ1 formed with an optical axis X of a light emitting element 10 is greater than zero and less than π/2 is made to refract in a direction separating from the optical axis X. An emission surface 32 has: a first emission surface 320 which is provided in a region including a point PX intersecting the optical axis X of the light emitting element 10 and which comprises a concave curved surface recessed in a direction going closer to the light emitting element 10 (downward); and a curved-shaped second emission surface 321 which is provided outside of the region. The emission surface 32 is formed in a shape in which such a change occurs that θ2/θ1, which is a ratio of a second refraction angle θ2 with respect to the first refraction angle θ1, becomes greater than 1 (θ2/θ1>1), and also, the ratio increases once according as the first refraction angle θ1 increases, and then the ratio decreases gradually.

Description

  The present invention relates to a lighting fixture, and more particularly to a lighting fixture using a solid light emitting element such as a light emitting diode as a light source.

  In recent years, light-emitting diodes with low power consumption and long life have attracted attention as light sources that can replace incandescent and fluorescent lamps. Since the light emitting diode itself is very small compared to an incandescent lamp or a fluorescent lamp, a light control member such as a lens is often used to obtain an irradiation range equivalent to that of the incandescent lamp or the fluorescent lamp. .

  Here, the thing of patent document 1 is illustrated as a prior art example of the light control member which controls the light of a light emitting diode. The light control member described in Patent Document 1 has a substantially circular planar shape as shown in FIG. 13, and a recess 100 that is in close contact with the light emitting surface 80 of the light emitting element 40 is formed on the back surface side. The recess 100 is located in the center on the back side of the light control member 50 and is formed in a hemispherical shape so as to be in close contact with the hemispherical light emitting surface 80 of the light emitting element 40. In such a light control member 50, the flat portion 110 on the back surface side is bonded and fixed to the mounting substrate 120 of the light emitting element 40, and the recess 100 on the back surface side is bonded and fixed to the light emitting surface 80 of the light emitting element 40. It has come to be.

  Further, the light control member 50 has a light control emission surface 60 formed on the outer surface side thereof. The light control emission surface 60 includes a first emission surface 60a located in a predetermined range centered on the optical axis L, and a second emission surface 60b formed continuously around the first emission surface 60a. Consists of. Among these, the 1st output surface 60a is a smooth curved surface shape which protrudes downward, and is a concave shape which a part of sphere cut out. Further, the second emission surface 60b is a smooth curved surface convex upwardly formed continuously with the first emission surface 60a, and the plane shape of the second emission surface 60b is a substantially hollow circle surrounding the first emission surface 60a. It is formed in a plate shape. The first emission surface 60a and the second emission surface 60b are smoothly connected, and the connection portion between the two emission surfaces 60a and 60b is an inflection point. Further, on the outer peripheral side of the second emission surface 60b constituting the light control emission surface 60, a third emission surface 60c for connecting the second emission surface 60b and the flat portion 110 on the back surface is formed.

  Here, assuming that a horizontal plane orthogonal to the optical axis L of the light emitting element 40 is a reference plane C, a position where the light H emitted from the light emitting element 40 and propagated through the light control member 50 is emitted from the light control emitting surface 60 (FIG. A line drawn parallel to the reference plane C at the intersection Px) of the light control exit surface 60 and the light H in the 13 cross section is denoted by A. Further, an angle formed between the tangent line B and the line A with respect to the contour line of the light control exit surface 60 at the position Px where the light H from the light emitting element 40 exits from the light control exit surface 60 is defined as θ3. Further, an angle formed between the light H reaching the light control emission surface 60 and a line passing through the arrival point Px and parallel to the optical axis L of the light emitting element 40 is defined as θ1. The light H from the light emitting element 40 propagated inside the light control member 50 is emitted from the light control emission surface 60 of the light control member 50 (the light H emitted from the light control emission surface 60 and the optical axis L). Is defined as θ5.

  The light control emission surface 60 is a direction in which at least the light having the maximum intensity is emitted from the light emitted from the light emitting element 40 (a direction along the optical axis L and a direction along the normal direction of the reference plane C). The relationship between θ1 and θ5 is (θ5 /) except for the light in the vicinity of the normal (optical axis L) within a predetermined range including the angle range from the light to the direction in which the light having the half value of the maximum intensity is emitted. θ1)> 1, and the value of θ5 / θ1 is formed to gradually decrease as θ1 increases.

  In the light control member 50 described in Patent Document 1, the light H from the light emitting element 40 propagates through the light control member 50 and then exits from the light control emission surface 60 to the outside (in the air) according to Snell's law. . At this time, the light from the light emitting element 40 emitted from the light control member 50 is not emitted locally, such as directly above the light emitting element 40, as compared to the light emitted from the hemispherical light control member 50, The light is emitted uniformly and smoothly toward the irradiation range.

  An example of a lighting fixture using the light control member 50 described in Patent Document 1 is shown in FIG. This luminaire includes a light source unit 1, a housing 4 that houses the light source unit 1, and a cover 5 having translucency. The light source unit 1 is provided for each light-emitting element 10, a substrate 11 formed in a square shape, a large number of light-emitting elements 10 mounted on the surface (upper surface) of the substrate 11 at regular intervals and arranged in rows and columns. And a large number of light control members 50.

  On the other hand, the housing 4 is formed in a rectangular box shape whose one surface (upper surface) is opened with a non-translucent material (for example, a metal plate), and the light source unit 1 is fixed to the inner bottom surface. The cover 5 is made of a light-transmitting material such as acrylic resin or polycarbonate resin and is formed in a rectangular box shape with one surface (lower surface) opened, and is placed on the housing 4 so as to be contained inside.

  Thus, the light emitted from the light emitting element 10 is emitted uniformly and smoothly by the light control member 50 and is emitted to the irradiated surface through the cover 5.

Japanese Patent No. 4357508

  By the way, in the luminaire described above, a plurality of screw insertion holes through which screws for fixing to the housing 4 are inserted are provided at the end of the substrate 11, and an insulation distance between the light emitting element 10 and the housing 4 is ensured. Therefore, the light emitting element 10 is mounted on a portion near the center excluding the peripheral portion of the substrate 11. Then, when the light control member 50 described in Patent Document 1 is used, the light of the light emitting element 10 is irradiated in a wide range and smoothly, so that the light in a specific direction (direction toward the edge of the cover 5) is relatively reduced. Then, when viewed from the front, the periphery of the front surface (light emitting surface) of the cover 5 becomes dark (the luminance is low) (see FIGS. 5B and 6B).

  The present invention has been made in view of the above problems, and an object thereof is to improve the luminance uniformity on the light emitting surface.

  The lighting fixture of the present invention is a lighting fixture including a lighting unit that is configured in a rectangular box shape and emits light from a front surface, and a fixture main body that holds a plurality of the lighting units side by side on the same plane. Includes a light source unit in which a plurality of light emitting elements are mounted on a substrate in a vertical and horizontal manner and equidistantly, a housing formed in a rectangular box shape with one surface opened to store the light source unit, and the substrate or A plurality of optical members that are held in the casing and control light distribution of light emitted from the light emitting elements, and are formed in a rectangular box shape that has translucency and light diffusibility and covers the opening of the casing. A plurality of optical members made of a light-transmitting material, covering the light emitting surface of the light emitting element and refracting incident light, and the incident A medium portion through which the light incident on the surface propagates; An exit surface that refracts and emits the light propagating through the medium portion, and among the plurality of optical members, at least the exit surface of the optical member adjacent to the side wall of the cover is the medium. The angle formed by the propagation direction of the light that propagates through the part and reaches the exit surface and the optical axis of the light emitting element is defined as a first refraction angle θ1, and the propagation direction of the light after exiting from the exit surface and the optical axis Is the second refraction angle θ2, the ratio of the second refraction angle to the first refraction angle θ2 / θ1 is larger than 1, and the ratio increases as the first refraction angle increases. Once increased, it is formed into a shape that causes a change in which the ratio gradually decreases.

  In this lighting apparatus, it is preferable that the plurality of optical members are connected to each other.

  In this luminaire, it is preferable that a diffusion portion for diffusing the light is provided on at least one of the incident surface and the exit surface.

  In this lighting fixture, it is preferable that the lighting unit further includes holding means for detachably holding the lighting unit on the fixture main body.

  The lighting fixture of the present invention has an effect of improving the luminance uniformity on the light emitting surface.

The optical member in embodiment of the lighting fixture which concerns on this invention is shown, (a) is sectional drawing, (b) represents the relationship between 1st refraction angle (theta) 1 and ratio of 2nd refraction angle (theta) 2 with respect to 1st refraction angle (theta) 1. FIG. FIG. (a) is sectional drawing which shows the optical path of the optical member in the same as the above, (b) is sectional drawing which shows the optical path of the optical member in a prior art example. (a) is a figure which shows the light distribution characteristic of the optical member in the same as the above, (b) is a figure which shows the light distribution characteristic of the optical member in a prior art example. The lighting unit in the above is shown, (a) is a partially broken front view, (b) is a partially broken side view, (c) is a rear view, and (d) is a partially broken side view. (a) is the luminance distribution figure of the light emission surface in the same as the above, (b) is the luminance distribution figure of the light emission surface in a prior art example. (a) is the luminance distribution figure of the light emission surface in the same as the above, (b) is the luminance distribution figure of the light emission surface in a prior art example. It is a perspective view which shows another structure of the optical block in the same as the above. It is an exploded perspective view same as the above. The same as above, (a) is a sectional side view, (b) is a partially broken front view. It is a sectional side view same as the above. (a)-(d) is a perspective view same as the above. (a)-(e) is a front view same as the above. It is sectional drawing of the optical member in a prior art example. A conventional example is shown, (a) is an exploded perspective view, (b) is a plan view.

  Hereinafter, embodiments of a lighting apparatus according to the present invention will be described in detail with reference to the drawings.

  First, the lighting unit A constituting the lighting fixture of the present embodiment will be described with reference to FIG. The illumination unit A includes a light source unit 1, an optical block 2, a housing 4, a cover 5, and the like.

  The light source unit 1 is configured by mounting a plurality of (in the illustrated example, 36) light emitting elements (light emitting diodes) 10 on a surface of a substantially square substrate 11 having chamfered four corners arranged side by side at equal intervals. Yes. Although not shown, a wiring pattern for energizing each light emitting element 10 is printed on the surface of the substrate 11, and the end of the wiring pattern is connected to a receptacle connector (not shown). The substrate 11 may be a rigid substrate, a flexible substrate, or a rigid flexible substrate. The light-emitting element 10 includes a light-emitting diode (LED) chip and a sealing member made of a synthetic resin (for example, a silicone resin) that has translucency and is mixed with a fluorescent material. That is, a part of the light emitted from the LED chip (for example, blue light) is wavelength-converted with a fluorescent material, and the wavelength-converted light (for example, yellow light) and the light that has not been wavelength-converted (blue light) are mixed. As a result, the light emitted from the light emitting element 10 becomes white light as a whole.

  The board 11 has an insertion hole 110 through which the feeder line 12 is inserted. A plug connector 13 is connected to the tip of the power supply line 12. This plug connector 13 is connected to the receptacle connector.

  The casing 4 is formed by bending a metal plate, and has a square-shaped bottom plate 40 and four side plates 41 bent and raised in the same direction from four pieces of the bottom plate 40, respectively. It is formed in an open rectangular box shape. However, the material forming the housing 4 is not limited to metal, and may be any material (for example, synthetic resin) that satisfies the heat-resistant temperature and durability required in the intended use and usage environment.

  The cover 5 is formed in a rectangular box shape with one surface (rear surface) opened by a light-transmitting material such as an acrylic resin, a polycarbonate resin, or a cycloolefin resin. However, the vertical and horizontal dimensions of the opening of the cover 5 are set to be larger than the vertical and horizontal dimensions of the casing 4 and block the opening surface (front surface) of the casing 4 as shown in FIGS. As shown in FIG.

  In the optical block 2, the rectangular flat base material 20 and the same number (36 in the illustrated example) of optical members 3 as the light emitting elements 10 have translucency such as acrylic resin, polycarbonate resin, and cycloolefin resin. It is integrally formed of material. The structure of the optical member 3 will be described in detail later.

  The light source unit 1 is fixed to the inner bottom surface of the housing 4 by screwing the substrate 11 to the bottom plate 40 of the housing 4. However, the substrate 11 may be bonded and fixed to the bottom plate 40 of the housing 4. The optical block 2 is fixed to the inner bottom surface of the housing 4 by screwing the base material 20 to the bottom plate 40 of the housing 4. In the present embodiment, since the plurality of optical members 3 are integrally formed with the base material 20 and are connected to each other, the case 4 is compared with the case where the optical members 3 are not connected as in the conventional example. There is an advantage that it is easy to fix.

  A cover 5 is put on the front surface of the housing 4 in which the light source unit 1 and the optical block 2 are housed, and the cover 5 and the housing 4 are fixed by screwing. That is, light emitted from the light source unit 1 and subjected to light distribution control by the optical block 2 is irradiated to the front of the housing 4 (upward in FIG. 4B) through the cover 5.

  A pair of spring holders 42 are screwed to the rear surface side of the bottom plate 40 of the housing 4. However, the screw that screws the spring holder 42 to the bottom plate 40 is shared with the screw that screws the optical block 2 to the bottom plate 40.

  The spring holding body 42 is for holding a so-called kick spring 43, and connects and holds the kick spring 43 to a connecting portion 420 protruding in the center in the longitudinal direction. The kick spring 43 includes a coil portion 430 formed by winding a spring steel wire in a coil shape, a pair of arm portions 431 each extending in a V shape at both ends of the coil portion 430, and tips of the arm portions 431. And a hook portion 432 curved in a substantially arc shape. The kick spring 43 is held by the spring holder 42 when the connecting portion 420 is inserted through the coil portion 430.

  Further, a lead-out hole 400 for drawing out the power supply line 12 passes through the bottom plate 40 of the housing 4. The power supply line 12 drawn out from the lead-out hole 400 is connected to the plug connector 16 together with the ground line 15. One end of the ground wire 15 is screwed to the bottom plate 40, and the plug connector 16 is connected to the other end. The feeder 12 and the ground wire 15 are hooked and held by a cord hook 17 screwed to the bottom plate 40. Plug connector 16 is connected to a receptacle connector (not shown). Then, direct-current power is supplied to the light source unit 1 from the power supply device 7 described later via the feeder line 12.

  Next, the optical member 3 will be described in detail.

  As shown in FIG. 1A, the optical member 3 includes an incident surface 30 that covers the light emitting surface of the light emitting element 10 and refracts incident light, a medium portion 31 through which light incident on the incident surface 30 propagates, and a medium And an exit surface 32 that refracts and emits light propagating through the portion 31.

  The incident surface 30 has a shape that refracts light incident in a predetermined angle range in which the angle θ1 formed with the optical axis X of the light emitting element 10 is greater than zero and less than π of half, such as, for example, It is formed in a shape similar to a rotating paraboloid or a rotating paraboloid. However, the light-emitting element 10 may be sealed by filling a light-transmitting material (for example, silicone resin) into a space surrounded by the incident surface 30.

  The emission surface 32 is provided in a region including a point PX that intersects the optical axis X of the light emitting element 10, and has a first emission surface 320 formed of a concave curved surface that is recessed toward the light emitting device 10 (downward), and outside the region. And a curved second emission surface 321 provided. However, the boundary in the cross section of the 1st output surface 320 and the 2nd output surface 321 becomes the inflection point PY.

  Here, the angle between the optical axis X and the propagation direction of the light that propagates through the medium portion 31 and reaches the emission surface 32 is defined as the first refraction angle θ1, and the propagation direction and the optical axis of the light emitted from the emission surface 32 The angle formed by X is the second refraction angle θ2. At this time, the exit surface 32 has a ratio θ2 / θ1 of the second refraction angle θ2 to the first refraction angle θ1 larger than 1 (θ2 / θ1> 1), and the ratio increases as the first refraction angle θ1 increases. Is once increased, and is formed into a shape that causes a change in which the ratio gradually decreases (see a solid line L1 in FIG. 1B). In addition, it is preferable that the ratio takes a maximum value when the first refraction angle θ1 is in the range of 30 ° to 40 °.

  FIG. 1B shows the ratio (θ2 / θ1) of the optical member 3 in this embodiment and the ratio (θ5 / θ) of the light control member 50 in the conventional example described in Patent Document 1 (hereinafter abbreviated as the conventional example). FIG. 6 is a diagram comparing θ1) with the first refraction angle θ1 as a horizontal axis. In addition, the continuous line L1 shows this embodiment and the broken line L2 has shown the prior art example of patent document 1. FIG.

  Further, FIG. 2A shows the light path of the light distributed by the optical member 3 in this embodiment, and FIG. 2B shows the light path of the light distributed by the light control member 50 in the conventional example. Show. Furthermore, the light distribution characteristic of the optical member 3 in this embodiment is shown in FIG. 3A, and the light distribution characteristic of the light control member 50 in the conventional example is shown in FIG. As apparent from FIGS. 2 and 3, according to the optical member 3 in the present embodiment, the angle formed with the optical axis X is close to 90 ° (π / 2) as compared with the light control member 50 in the conventional example. The amount of light is greatest at an angle (about 75 ° in the illustrated example).

  5A and 6A show the luminance distribution of the light emitting surface of the cover 5 in the illumination unit A. FIG. Similarly, FIG. 5B and FIG. 6B show the luminance distribution of the light emitting surface of the cover 5 in the conventional lighting fixture. As apparent from FIGS. 5 and 6, in the lighting unit A in the present embodiment, the luminance of the peripheral portion on the light emitting surface (front surface) of the cover 5 is higher than that of the conventional example, and the luminance on the light emitting surface is high. The uniformity is improved.

  By the way, the shape of the emission surface 32 in the some optical member 3 of the optical block 2 does not need to be the same. For example, as shown in FIG. 7, the emitting surfaces 32 of the peripheral 20 optical members 3 (3B) and the emitting surfaces 32 of the 16 optical members 3 (3A) in the center are mutually shaped (maximum values). The angle of the first refraction angle θ1) may be different. For example, the 16 optical members 3 (3A) in the central portion have the light distribution characteristics shown in FIG. 3A, and the 20 optical members 3 (3B) in the periphery have the largest amount of light. What is necessary is just to give the light distribution characteristic which made the angle relatively small (for example, 50 degrees-60 degrees).

  Further, if a diffusing portion for diffusing light is provided on at least one of the incident surface 30 and the emitting surface 32 of the optical member 3, the luminance uniformity on the light emitting surface can be further improved. Note that the diffusing portion can be formed, for example, by subjecting a part or all of the entrance surface 30 or the exit surface 32 to a texture.

  Then, the lighting fixture of this embodiment is demonstrated in detail with reference to FIGS.

  The lighting fixture includes a fixture main body 6, a lighting unit A, a power supply device 7, a panel 8, and the like. However, in the following description, the vertical and horizontal directions and the front and rear directions are defined in FIG.

  The instrument body 6 includes a frame body 60, a reinforcing plate 61, a unit mounting plate 62, and the like. The frame body 60 is formed in a rectangular tube shape by a metal plate. Further, the front, rear, left and right side walls of the frame body 60 are formed to have the same dimensions, and the outer shape of the frame body 60 viewed from above and below is square (see FIG. 9B). A protruding wall 600 protruding inward is provided at the upper end of each side wall.

  The reinforcing plate 61 is made of the same type of metal plate as the metal plate constituting the frame body 60, and includes a strip-shaped main piece 610, and a side piece 611 bent and raised below a side edge along the longitudinal direction of the main piece 610. And an attachment piece 612 bent in parallel with the main piece 610 from the lower end of the side piece 611. Each reinforcing plate 61 is attached to the frame body 60 by screwing both ends in the longitudinal direction to the protruding wall 600 of the frame body 60 (see FIG. 9A).

  The unit mounting plate 62 includes a strip-shaped fixing piece 620 whose both ends are fixed to the front and rear side walls with the thickness direction aligned in the left-right direction, and a mounting piece 621 bent and raised in the left-right direction from the upper end of the fixing piece 620. Have. In the mounting piece 621, three holding holes 622 are formed at equal intervals. Note that the unit mounting plate 62 has three types, one in which the mounting piece 621 is disposed on the right side of the fixed piece 620 and one in which the mounting piece 621 is disposed on the left side of the fixed piece 620. They are provided one by one (see FIG. 9A). Then, the four unit mounting plates 62 excluding the two unit mounting plates 62 at both ends are arranged at a position where the two left and right side walls are partitioned into three spaces, with the two fixed pieces 620 in close contact with each other. ing. Then, it is possible to detachably attach a maximum of three illumination units A (or panels 8) arranged in the front-rear direction to two unit mounting plates 62 adjacent in the left-right direction (see FIG. 8). .

  The power supply device 7 includes a power conversion circuit that converts AC power supplied from a commercial AC power source into DC power, a control circuit that controls the operation of the power conversion circuit, and the like housed in a metal case. 61 is fixed to the lower surface side of the main piece 610 by screws (see FIG. 8).

  The power supply device 7 is connected by a power supply terminal block 63 attached to the side wall of the frame body 60 and a power supply line 630, and connected by a signal terminal block 64 attached to the lower surface of the protruding wall 600 and a signal line 640. The Note that a power line (not shown) to which AC power is supplied is connected to the power terminal block 63, and a transmission line (not shown) for transmitting a switching signal for turning on / off is transmitted to the signal terminal block 64. Connected. That is, AC power is supplied to the power conversion circuit of the power supply device 7 via the power supply terminal block 63, and a switching signal or the like is transmitted to the control circuit of the power supply device 7 via the signal terminal block 64.

  Further, two output lines 70 are drawn from the power supply device 7. One end of each output line 70 is connected to the output end of the power conversion circuit, and the other end is connected to a plurality of relay receptacle connectors 71. Each relay receptacle connector 71 is attached to the attachment piece 612 of the reinforcing plate 61, and the plug connector 16 of each illumination unit A is detachably connected (see FIG. 9A).

  The panel 8 includes a rectangular box-shaped panel body 80, a pair of extending pieces 81 extending upward from the left and right side walls of the panel body 80, and a pair of spring holders 82 attached to the extending pieces 81. And a kick spring 83 held by each spring holder 82 (see FIGS. 8 and 9A). Note that the configuration of the kick spring 83 and the spring holder 82 is substantially the same as that of the kick spring 43 and the spring holder 42 used in the lighting unit A, and a description thereof will be omitted.

  Next, a procedure for assembling the lighting fixture by attaching the lighting unit A and the panel 8 to the fixture body 6 will be described. However, since the attachment method of the illumination unit A and the panel 8 to the fixture body 6 is common, only the attachment method of the illumination unit A will be described.

  First, the installer bends with fingers so that both arms 431 of the kick spring 43 held by the spring holder 42 are brought close to each other, and then inserts both arms 431 into the holding hole 622 of the unit mounting plate 62 from below. Release your finger. Then, both arms 431 of the kick spring 43 are opened in the direction away from each other, and the hooking portion 432 of each kick spring 43 is hooked on the periphery of the holding hole 622, so that the illumination unit A is suspended from the instrument body 6. . In this state, the installer connects the plug connector 16 of the lighting unit A to the receptacle connector 71 for relay attached to the attachment piece 621 of the reinforcing plate 61. Finally, when the installer lifts the lighting unit A from below and pushes it into the instrument main body 6, the kick spring 43 passes through the holding hole 622, and the both arm portions 431 further expand away from each other. As a result, due to the spring force of the kick spring 43, the lighting unit A is held by the fixture body 6 with the lower end portion of the cover 5 slightly protruding out of the fixture body 6. In other words, in the lighting fixture of the present embodiment, the holding means for detachably holding the lighting unit A to the fixture body 6 is realized by the kick spring 43 and the unit mounting plate 62.

  In addition, when removing the illumination unit A from the instrument main body 6 for maintenance etc., the builder should just pull down the illumination unit A against the spring force of the kick spring 43. FIG. When the lighting unit A is pulled down, the arms 431 of the kick spring 43 bend in a direction approaching each other, and the hooking unit 432 is hooked on the periphery of the holding hole 622, so that the lighting unit A is suspended from the instrument body 6. It will be in the state. In this state, the illumination unit A can be removed from the instrument body 6 by pulling it out of the holding hole 622 while bending both arms 431 of the kick spring 43 in the direction of approach.

  Here, the instrument main body 6 has a total of nine attachment points, three in each of front, rear, left, and right (see FIGS. 11 and 12). The lighting unit A or the panel 8 can be attached to any of these nine attachment locations. For example, as shown in FIGS. 11 (a) and 12 (a), the lighting unit A may be attached to four attachment locations at the four corners, and the panel 8 may be attached to the remaining five attachment locations. Moreover, as shown in FIG.11 (b) and FIG.12 (b), while attaching the illumination unit A to three center attachment locations, you may attach the panel 8 to the remaining six attachment locations. Further, as shown in FIGS. 11 (c) and 12 (c), the lighting unit A is attached to the two attachment points at both ends in the front-rear direction and the center in the left-right direction, and the panel 8 is attached to the remaining seven attachment points. May be. Furthermore, as shown in FIGS. 11 (d) and 12 (d), the lighting unit A may be attached to one central attachment location, and the panel 8 may be attached to the remaining eight attachment locations. Moreover, as shown in FIG.12 (e), while attaching the illumination unit A to six attachment locations of right and left both ends, you may attach the panel 8 to the remaining three attachment locations.

  In addition, the lighting fixture of this embodiment is a conventionally well-known lighting fixture for system ceilings. That is, by placing the outer flange portion 601 projecting outward from the lower end edge of the frame body 60 of the fixture body 6 on the head of the ceiling bar (so-called T-bar) B constituting the system ceiling, 6) is held by the ceiling bar B (see FIG. 10).

DESCRIPTION OF SYMBOLS 1 Light source part 3 Optical member 4 Case
10 Light emitting element
11 Board
30 Incident surface
31 Medium part
32 Outgoing surface
320 First exit surface
321 Second exit surface θ1 First refraction angle θ2 Second refraction angle

Claims (4)

In a lighting fixture comprising a rectangular unit configured to emit light from the front, and a fixture body that holds a plurality of the lighting units side by side on the same plane,
The illumination unit includes a light source unit in which a plurality of light emitting elements are mounted on a substrate in a vertical and horizontal manner and equidistantly, and a housing that is formed in a rectangular box shape with one side opened to store the light source unit, A plurality of optical members for controlling the light distribution of light emitted from the light emitting elements held by the substrate or the casing, and a rectangular box shape having translucency and light diffusibility and covering the opening of the casing And a cover that is formed and held by the housing,
The plurality of optical members are made of a light-transmitting material, cover a light emitting surface of the light emitting element and refract incident light, and a medium portion through which the light incident on the incident surface propagates. An exit surface that refracts and emits the light propagating through the medium portion,
Among the plurality of optical members, at least the emission surface of the optical member adjacent to the side wall of the cover has a propagation direction of light that propagates through the medium portion and reaches the emission surface, and an optical axis of the light emitting element. Is the first refraction angle θ1, and the angle between the light propagation direction after exiting from the exit surface and the optical axis is the second refraction angle θ2, the first refraction angle with respect to the first refraction angle. The ratio of two refraction angles θ2 / θ1 is larger than 1, and the ratio increases once as the first refraction angle increases, and then the shape is formed so as to gradually change the ratio. A lighting apparatus characterized by that.   The lighting apparatus according to claim 1, wherein the plurality of optical members are connected to each other.   The luminaire according to claim 1, wherein a diffusion portion that diffuses the light is provided on at least one of the incident surface and the emission surface.   The lighting fixture according to any one of claims 1 to 3, further comprising holding means for detachably holding the lighting unit on the fixture main body.