JP2012069504A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture having a simple structure and still capable of thinning.SOLUTION: Since an opening 81 is formed, in a central part of a light guide plate 8 to each side of which unitized light source parts 7 are arranged correspondingly, so as to correspond to an adapter 2 which is connected electrically and mechanically to a fixture body and a hooking ceiling body installed on a ceiling face as a fixture installation face, a work operation can be done without removing the light guide body 8 when the fixture body is fitted to or removed from the adapter 2, and thereby, the lighting fixture having a simple structure and still capable of thinning can be provided.

Description

  Embodiments described herein relate generally to a lighting fixture that performs illumination using a light guide plate using a light emitting element such as an LED as a light source.

  2. Description of the Related Art In recent years, along with higher output, higher efficiency, and widespread use of LEDs, lighting fixtures that can be used indoors or outdoors using LEDs as light sources have been developed. This lighting fixture is obtained by mounting a plurality of LEDs on a substrate so as to obtain a predetermined amount of light. For example, the lighting fixture is used as a so-called direct mounting type base lighting that is directly attached to a ceiling surface or the like.

  However, the light emitted from the LED has high directivity and is likely to cause glare, and uneven brightness tends to occur. Therefore, in order to suppress glare and improve the uniformity of the light emitting surface, a new lighting fixture that performs illumination using a light guide plate has been developed.

  In the case of such a luminaire, for example, in a type in which an adapter is electrically and mechanically connected to a hanging ceiling body installed on a ceiling surface for a general house, and the luminaire main body is attached to the adapter. Nearly the entire lower surface of the lighting fixture body is covered with the light guide plate.

JP 2009-021200 A JP 2009-283197 A

  However, in the lighting fixture using the light guide plate as described above, the light incident end face and the light source such as the LED need to be arranged to face each other so that the light emitted from the light source such as the LED enters the light incident end face of the light guide plate. In addition, it is necessary to form an opening at the substantially central portion of the light guide plate corresponding to the adapter.

  If an opening is formed in the substantially central portion of the light guide plate, there is a problem that light that has entered and traveled from the light incident end face of the light guide plate is emitted to the outside from the side end face of the opening, thereby reducing efficiency.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting fixture that has an opening corresponding to an adapter in a light guide plate and can be thinned with a simple configuration.

  The lighting fixture according to the first embodiment of the present invention has an adapter that is electrically and mechanically connected to a hanging sealing body installed on the fixture mounting surface, and has an opening in a substantially central portion facing the adapter. And a light guide plate having a light incident end face at least on the outer periphery, a light emitting element disposed so that outgoing light is incident on the light incident end face of the light guide plate, and a lighting device for controlling lighting of the light emitting element. And an instrument main body attached to the adapter.

  According to one embodiment of the present invention, in a lighting fixture having an opening in a light guide plate, a lighting fixture capable of being thinned with a simple configuration and capable of efficiently irradiating light from the opening side end surface of the light guide plate is provided. can do.

It is a perspective view which shows the lighting fixture which concerns on embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the same lighting fixture. It is a perspective view which shows the same instrument main body seeing from the back side. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. It is an enlarged view which shows the A section in FIG. It is an enlarged view which shows the B section in FIG. It is a top view which shows the light-guide plate of the instrument main body. The board | substrate with which the light emitting element of the instrument main body was mounted is shown, (a) is a front view, (b) is a top view. It is a top view which shows the arrangement | positioning relationship between the light-guide plate in the same instrument main body, and the light emitting element mounted in the board | substrate. It is sectional drawing which shows the attachment state to the ceiling surface of the lighting fixture. Similarly, it is sectional drawing which shows the attachment state to the ceiling surface of a lighting fixture. It is a perspective view which shows the lighting fixture which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the lighting fixture which concerns on the 3rd Embodiment of this invention.

  The lighting fixture of this embodiment is a type used by being attached to a hanging ceiling body installed on the fixture mounting surface, and for example, lighting a room using a light guide plate.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 11. In addition, the same code | symbol is attached | subjected to the same part in each figure, and the overlapping description is abbreviate | omitted.

  1 to 4, the luminaire includes an adapter 2 (FIG. 2 and FIG. 2) that is electrically and mechanically connected to a hook ceiling body Cb installed on a ceiling surface C as a fixture body 1 and fixture mounting surface. FIG. 10). As shown in FIG. 1, the instrument body 1 is formed in a substantially square appearance, and the front side is a light irradiation surface and the back side is a mounting surface to the ceiling surface C.

  As representatively shown in FIG. 2, the fixture body 1 includes a lighting device 3, a reflector plate 4, a chassis 5, an adapter guide 6, a light source unit 7, a light guide plate 8, a body frame 9, and a cover. And a member 10. These components will be described sequentially.

  The lighting device 3 is configured by housing a circuit board and circuit components mounted on the board in a box-shaped case, and is connected to a commercial AC power source via the adapter 2. It receives an AC power supply and generates a DC output. Therefore, the lighting device 3 is electrically connected to a light source unit 7 to be described later, supplies the direct current output to the light emitting element 71, and controls the lighting of the light emitting element 71. The lighting device 3 is mounted on the back side of the reflecting plate 4 (see FIG. 3).

  The reflector 4 is formed in a substantially square shape from a metal material such as aluminum, and has a square shallow dish-shaped recess 41, and an attachment piece 42 extending outward is provided on each side of the recess 41. Is formed. Further, the front side of the concave portion 41 is configured as a reflecting surface, and a rectangular opening 43 is formed in a substantially central portion.

  As shown in FIG. 5 with reference to FIG. 5, the chassis 5 is formed in a substantially rectangular parallelepiped box shape from a metal material such as a cold-rolled steel plate, and opens one end side (the lower side in the drawing). Each side is formed with a bowl-shaped contact portion 51 extending in the horizontal direction toward the outside. A circular opening 52 is formed on the other end side (upper side in the drawing). Therefore, the chassis 5 has a substantially cylindrical shape with a low height as a whole. The contact portion 51 is a portion that contacts the back side of the light guide plate 8, and the opening 52 is a portion through which the adapter 2 is inserted. And as shown in FIG. 5, it arrange | positions so that the peripheral part of the opening 43 in the reflecting plate 4 may overlap | superpose on the upper surface side of the contact part 51 of the chassis 5, and this is fixed by welding etc. As shown in FIG. The contact portion 51 of the chassis 5 has a function of reinforcing the light guide plate 8.

  As shown with reference to FIG. 5, the adapter guide 6 is formed in a substantially octagonal prism shape, and is provided with an engaging port 61 through which the adapter 2 is inserted and engaged at the center, and is provided at the lower end side. A flange 62 is formed toward the direction. The adapter guide 6 is disposed and attached such that the outer peripheral surface thereof is in contact with the inner peripheral surface of the chassis 5.

  As shown in FIGS. 2, 4, 6, and 8, the light source unit 7 includes a substrate 72 on which the light emitting element 71 is mounted and an attachment plate 73 as an attachment member to which the substrate 72 is attached. Yes.

  As representatively shown in FIG. 8, the substrate 72 is formed in a horizontally long rectangular shape with both ends notched and formed in a step shape, and is made of a flat plate of glass epoxy resin as an insulating material. The wiring pattern formed in (1) is applied. Further, a resist layer is appropriately applied. In addition, as a material of the substrate 72, a ceramic material or a synthetic resin material can be applied when an insulating material is used. Furthermore, when it is made of metal, a metal base substrate in which an insulating layer is laminated on one surface of a base plate having good thermal conductivity such as aluminum and excellent heat dissipation may be applied.

  The light emitting element 71 is an LED, which is a surface mount type LED package. A plurality of, specifically, 15 LED packages are arranged and arranged in a straight line along the longitudinal direction of the substrate 72. The LED package is generally composed of an LED chip disposed in a main body formed of ceramics, and a translucent resin for molding such as an epoxy resin or a silicone resin that seals the LED chip. Yes.

  The LED chip is a blue LED chip that emits blue light. In the translucent resin, a phosphor is mixed, and in order to be able to emit white light, a yellow phosphor that emits yellow light that is complementary to blue light is used. Yes.

  In addition, LED may be made to mount an LED chip directly on the board | substrate 72, and you may make it mount a bullet-type LED, and a mounting system and a format are not specifically limited.

  The mounting plate 73 is made of a material having good heat conduction, such as aluminum or galvanized steel plate, and is horizontally long and has a substantially C-shaped channel shape. On the inner side wall of the mounting plate 73, two substrates 72 are mounted side by side in the longitudinal direction so that the back surfaces thereof are in close contact by screwing or the like. Therefore, the light source unit 7 is unitized by attaching two substrates 72 to one mounting plate 73.

  In the present embodiment, as shown mainly in FIG. 2, four unitized light source sections 7 are used and arranged corresponding to each side of the light guide plate 8.

  As shown in FIG. 7, the light guide plate 8 is formed in a rectangular flat plate shape using a material having high transmittance such as acrylic resin, and the back side is a dot made up of a large number of white reflective dots that diffuse light. A pattern is formed by printing. Further, a substantially octagonal opening 81 is formed at a substantially central portion of the light guide plate 8 so as to correspond to the outer shape of the adapter guide 6 and to correspond to the adapter 2. The substantially octagonal opening 81 is originally formed as a shape having a square corner portion chamfered. Further, each side of the rectangular shape that is the outer peripheral portion of the light guide plate 8, that is, the side end surface functions as a light incident end surface 82 in which light emitted from the light emitting element 71 is incident and travels in the light guide plate 8. It has become.

  In addition, what provided the reflective sheet in the back side, and what provided the diffusion sheet in the front side are applicable to the light-guide plate 8 suitably.

  As shown in FIG. 9, a substrate 72 of the light source unit 7 is disposed on each side of the light guide plate 8. That is, the plurality of light emitting elements 71 are arranged in a straight line on the substrate 72 so that light enters the light incident end face 82 of the light guide plate 8. In this case, the light emitting element 71 is arranged on the extension line L of the outer side forming the opening 81 in the light guide plate 8. In other words, the light emitting element 71 is positioned on a line L that is orthogonal to the straight line arranged in a straight line on the substrate 72 and is in contact with the outer shape of the opening 81 of the light guide plate 8. It is like that.

  The main body frame 9 is made of a synthetic resin such as ABS resin or polycarbonate, has a substantially square shape and is formed in a frame shape larger than the dimension of the light guide plate 8, and includes a side wall 91 and a lower end of the side wall 91. A bottom wall 92 having an inclined portion extending inward from the portion and rising obliquely. A plurality of bosses 93 are erected on the bottom wall 92, and the attachment pieces 42 of the reflection plate 4 are screwed to the bosses 93.

  The cover member 10 is formed in a substantially square shape from a synthetic resin material having a milky white color such as acrylic resin or polycarbonate, and is detachably attached to the adapter guide 6 by an engaging / disengaging means (not shown). Therefore, by attaching the cover member 10, the adapter 2 is covered and can be made difficult to visually recognize from below.

  As shown in FIGS. 2 and 10, the adapter 2 is electrically and mechanically connected to a hanging sealing body Cb installed on the ceiling surface C by a hooking blade provided on the upper surface side. A pair of locking portions 21 are provided on both sides of the peripheral wall so as to always protrude to the outer peripheral side by a built-in spring. The locking portion 21 is immersed by operating a lever provided on the lower surface side. Further, a power cord (not shown) connected to the lighting device 3 is led out from the adapter 2 and is connected to the lighting device 3 via a connector.

  Next, the assembly process of the instrument body 1 configured as described above will be described mainly with reference to FIGS. As described above, the chassis 5 is disposed on the upper surface side of the contact portion 51 so that the peripheral portion of the opening 43 of the reflector 4 is overlapped, and is fixed to the reflector 4 by welding or the like at this portion. . Then, the mounting plate 73 of the light source unit 7 is screwed to the reflecting plate 4, and the light guide plate 8 is disposed so that the light incident end face 82 faces the light emitting element 71.

  Next, the adapter guide 6 is inserted through the opening 81 of the light guide plate 8 so that the outer peripheral surface thereof is in contact with the inner peripheral surface of the chassis 5, and the upper surface is screwed to the other end surface of the chassis 5. In this state, the attachment pieces 42 of the reflection plate 4 are screwed to the plurality of bosses 93 of the main body frame 9, and the cover member 10 is attached to the adapter guide 6.

  Although the assembly of the instrument main body 1 is completed as described above, the order of the assembly is not particularly limited.

  In such an instrument main body 1, the contact portion 51 of the chassis 5 is in contact with the back side of the light guide plate 8 as representatively shown in FIG. 5. More specifically, the contact portion 51 of the chassis 5 is disposed on and in contact with the periphery of the opening 81 on the back side of the light guide plate 8. The contact of the contact portion 51 of the chassis 5 with the back side of the light guide plate 8 may be performed directly or indirectly.

  Further, as representatively shown in FIG. 5, the peripheral portion on the front side of the opening 81 in the light guide plate 8 is supported by the flange portion 62 on the lower end side of the adapter guide 6. Further, as representatively shown in FIG. 6, the outer peripheral edge portion on the front surface side of the light guide plate 8 is supported by the inclined portion of the bottom wall 92 in the main body frame 9. On the other hand, the reflection plate 4 is disposed on the back side of the light guide plate 8, and the light guide plate 8 is inclined with respect to the reflection plate 4, the flange portion 62 of the adapter guide 6 and the bottom wall 92 of the main body frame 9. It arrange | positions so that it may be pinched | interposed by a part. In this state, the light incident end face 82 of the light guide plate 8 is positioned to face the light emitting element 71 so that light emitted from the light emitting element 71 is incident thereon.

  Further, as shown in FIGS. 3, 4, and 6, a gap G is formed between the side wall 91 of the main body frame 9 and the mounting piece 42 of the reflecting plate 4. That is, the outer shape of the reflecting plate 4 is smaller than the frame-shaped main body frame 9, and the gap G is formed over the entire circumference of the reflecting plate 4. Heat generated from the light emitting element 71 due to the gap G is radiated by the convection action through the mounting plate 73. In order to promote this convection action, an air circulation hole may be formed in the bottom wall 92 of the main body frame 9.

  Next, the attachment state to the ceiling surface C of the lighting fixture comprised as mentioned above is demonstrated with reference to FIG.10 and FIG.11. In addition, illustration of the power cord derived | led-out from the adapter 2 is abbreviate | omitted in each figure.

  As shown in FIG. 10, a hanging ceiling body Cb is installed on the ceiling surface C. Further, the adapter 2 is electrically and mechanically connected to the hooking sealing body Cb. From this state, as shown by the arrow in the figure, until the engaging portion 61 of the adapter 2 is securely engaged with the engaging port 61 of the adapter guide 6 while the engaging port 61 of the adapter guide 6 in the instrument body 1 is aligned with the adapter 2. The instrument body 1 is pushed up from below by hand to perform the mounting operation.

  As shown in FIG. 11, in the mounting state of the instrument body 1, the adapter 2 is inserted through the opening 52 of the chassis 5, and the locking portion 21 of the adapter 2 is locked to the engaging port 61 of the adapter guide 6. Retained.

  Moreover, when removing the instrument main body 1, it can remove by removing the cover member 10, operating the lever provided in the adapter 2, and releasing engagement of the latching | locking part 21 of the adapter 2. FIG.

  In such an instrument body 1, an opening 81 is formed in the light guide plate 8 and is not configured to cover substantially the entire lower surface of the instrument body 1 including the engagement port 61 of the adapter guide 6. Therefore, when attaching and removing the instrument main body 1, the operation can be performed without removing the light guide plate 8 from the instrument main body 1 for the operation of the adapter 2 and the like. In addition, since the adapter guide 6 is attached by being inserted through the opening 81 of the light guide plate 8, the instrument body 1 can be thinned.

  Further, in the mounting operation of the instrument body 1, when the instrument body 1 is pushed up from below by hand, the light guide plate 8 may be pushed up by hand and stress may be applied to deform the light guide plate 8. However, in the present embodiment, the chassis 5 is formed with a contact portion 51 facing the back side of the light guide plate 8, and this contact portion 51 is in contact with the back side of the light guide plate 8. The function of reinforcing the light plate 8 can be achieved, and deformation of the light guide plate 8 can be suppressed. Furthermore, since the contact part 51 is arrange | positioned around the opening 81 of the light-guide plate 8, the suppression of a deformation | transformation of the light-guide plate 8 can be performed effectively.

  When electric power is supplied to the lighting device 3 in the mounted state of the lighting fixture, the light emitting elements 71 are energized through the substrate 72, and the respective light emitting elements 71 are turned on. The light emitted from the light emitting element 71 is incident on the light incident end face 82 of the light guide plate 8. The incident light is totally reflected in the light guide plate 8 and spreads over the entire light guide plate 8, and is formed on the back side. The light diffused and reflected by the dot pattern consisting of the reflective dots is emitted from the front side. Further, a part of the light leaking from the light guide plate 8 is reflected by the reflecting plate 4 and radiated to the front side so as to be reused.

  Further, the heat generated from each light emitting element 71 is conducted from the back surface side of the substrate 72 to the mounting plate 73 and is radiated by a convection action promoted by the gap G between the main body frame 9 and the reflection plate 4. Further, the heat conducted to the mounting plate 73 is conducted to the reflecting plate 4 and is effectively radiated over a wide area of the reflecting plate 4.

  As described above, according to the present embodiment, since the opening 81 is formed in the light guide plate 8 corresponding to the adapter 2, the work can be performed without removing the light guide plate 8 when the instrument body 1 is attached to or removed from the adapter 2. It is possible to provide a lighting apparatus that can be made thin with a simple configuration.

  In this case, the light emitted from the light incident end face 82 on one side of the light guide plate 8 travels toward the opening 81 and is emitted from the front side, but a dark portion is generated in the vicinity of the light emitting element 71 in the opening 81. However, the light emitted from the light incident end face 83 from the inside of the opening 81 travels toward the light incident end face 82 on one side of the light guide plate 8. For this reason, the uniformity of the entire light guide plate 8 becomes more uniform.

  Note that the shape of the opening 81 is not necessarily a polygon, and may be a circle corresponding to the adapter 2.

  Furthermore, by changing the light color of the light emitting element 71 disposed on the side of the opening 81 and one side of the light guide plate 8, it is possible to improve the color rendering properties of light emitted from the lighting fixture, and to adjust the light. . In addition, by forming a reflective layer having a reflective action on the inner peripheral wall of the opening 81, light directed from the light incident end face 82 on one side of the light guide plate 8 toward the opening 81 can be efficiently reflected. The light guide plate 8 can be illuminated uniformly.

  In the above embodiment, four unitized light source units 7 are used, and the substrate 72 on which the light emitting element 71 is mounted is disposed corresponding to each side of the light guide plate 8. Two parts 7 may be used, and the substrate 72 may be disposed corresponding to two adjacent sides of the light guide 8. Further, the shapes and forms of the light guide plate 8 and the chassis 5 are not limited to the above embodiment, and for example, the light emitting element 71 may be a solid light emitting element such as an LED or an organic EL. Further, the number of light emitting elements 71 is not limited.

  FIG. 12 and FIG. 13 show the embodiments of the second and third lighting fixtures, and are plan views showing the positional relationship between the light guide plate 8 and the light emitting elements 71 mounted on the substrate 72. Other configurations are as follows. Since it is the same as that of the first embodiment, the same reference numeral is given and its description is omitted.

  In the present embodiment, as shown in FIG. 12, the light guide plate 8 is formed in a substantially octagonal flat plate shape, and an opening 81 having substantially the same shape and a different size is formed in the approximate center. The substantially octagonal sides 8c formed substantially at the center and the octagonal sides 8a of the outer peripheral portion of the light guide plate 8 have substantially the same center, and the opening 81 and the peripheral sides 8a, 8c is formed to be shifted in the circumferential direction. In other words, the side 8c of the substantially octagonal opening 81 and the corner 8b of the outer peripheral portion, and the corner 8d of the substantially octagonal opening 81 and the side 8a of the outer peripheral portion are formed to face each other in the circumferential direction.

  As described above, since the substrate 72 on which the plurality of light emitting elements 71 are mounted is disposed at the opening 81 and the octagonal sides 8c and 8a which are the outer peripheral portions, Since the light incident from the ends of the sides 8c and 8a of the portion can be guided toward the corner 8d of the opening 81, the light travels toward the corner 8b that is a relatively dark portion compared to the side 8a of the outer peripheral portion. Therefore, the corner 8b can emit light. On the other hand, since each side 8c of the opening 81 is provided with a substrate 72 on which a plurality of light emitting elements 71 are mounted, the light incident from the end face of the opening 81 as indicated by the broken line arrow is the corner 8b of the outer peripheral portion. The light can be guided toward.

  As described above, the unitized light source unit 7 is disposed on each side of the opening 81 and the outer peripheral portion of the light guide plate 8, and a corner of the outer peripheral portion is provided at a portion facing the side of the opening 81 having substantially the same center. 8b, since the corner 8d of the opening 81 is disposed so as to face the side 8a of the outer peripheral portion, the light emitted from the outer peripheral portion guides the inside of the light guide plate 8, and the corner portion 8b of the outer peripheral portion. And since it can irradiate toward the corner | angular part 8d of the opening 81, the light nonuniformity of the light-guide plate 8 can be suppressed.

  As another embodiment, as shown in FIG. 13, the light guide plate 8 has a round shape, and a circular opening 81 having the same size as the center of the light guide plate 8 is formed at the center thereof. Embodiments will be described.

  In the light-emitting element 71 of the present embodiment, a plurality of light-emitting elements 71 having the same interval are mounted and arranged on the flexible substrate 72 at the light incident end face of the outer periphery of the light guide plate 8 and the inner periphery of the opening 81. . Furthermore, the light emitting element 71 disposed on the outer periphery and the light emitting element 71 disposed on the inner periphery of the opening 81 are disposed with their positions shifted in the circumferential direction.

  In this case, the light emitted from the light emitting element 71 disposed on the outer periphery travels toward the opening 81 (indicated by a broken line in the drawing), and is guided toward the light emitting elements 72 disposed on the inner periphery of the opening 81. Shine. On the other hand, light emitted from the light emitting element 71 disposed in the opening 81 travels toward the outer periphery (indicated by a broken line in the drawing) and is guided toward the light emitting elements 71 disposed on the outer periphery.

  As described above, it is possible to suppress the occurrence of a dark portion between the opening 81 of the light guide plate 8 and the light emitting element 71 on the outer periphery, thereby reducing the decrease in uniformity.

DESCRIPTION OF SYMBOLS 1 ... Instrument main body, 2 ... Adapter, 3 ... Lighting apparatus, 4 ... Reflector,
5 ... Chassis, 6 ... Adapter guide, 7 ... Light source, 8 ... Light guide plate,
9 ... Body frame, 10 ... Cover member, 71 ... Light emitting element, 82 ... Light incident end face,
C ... Appliance mounting surface, Cb ... Hook ceiling body

Claims (4)

An adapter that is electrically and mechanically connected to a hook sealing body installed on the fixture mounting surface;
A light guide plate having an opening in the substantially central portion facing the adapter and having a light incident end face at least on the outer peripheral portion, and a light emission disposed so that outgoing light is incident on the light incident end face of the light guide plate An instrument body that includes an element and a lighting device that controls lighting of the light emitting element and is attached to the adapter;
The lighting fixture characterized by comprising.   2. The light emitting device according to claim 1, further comprising: a light incident end face at an inner peripheral portion of the opening at a substantially central portion of the light guide plate, and a light emitting element disposed so that outgoing light is incident on the light incident end face. lighting equipment.   The lighting apparatus according to claim 1, wherein the light guide plate has a reflecting means on the inner peripheral wall of the opening substantially at the center. The light emitting element disposed on the outer peripheral portion of the instrument main body and the light emitting element disposed on the inner periphery of the opening at the substantially central portion are substantially concentric with the inner periphery of the opening and centered at different sizes. The lighting apparatus according to claim 1, wherein the lighting apparatus is arranged so as to be shifted in a circumferential direction from light emitting elements arranged around the same shape.

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