JP6278253B2 - LED lighting fixtures - Google Patents

Description

  The present invention relates to an LED lighting apparatus that irradiates light from an LED light source through a light guide plate.

DESCRIPTION OF RELATED ART Conventionally, the LED lighting fixture which illuminates the light which LED which is a light source emits via a light-guide plate is known (for example, refer patent document 1).
As illustrated in FIG. 12, the illumination device 100 described in Patent Document 1 includes a chassis 101 as a device main body, and an LED module 102 serving as a light source includes a light source holding unit 103 on a lower surface of the chassis 101. Is attached via. The LED module 102 includes an LED substrate 104, and LEDs 105 are mounted on the LED substrate 104 along the long sides. The light source holding part 103 has a regular octagonal peripheral wall formed toward the outer edge of the chassis 101.

A light guide plate 106 is provided on the lower surface of the chassis 101. A reflective sheet 108 is provided between the chassis 101 and the light guide plate 106. A diffusion plate 109 is provided on the lower surface of the light guide plate 106.
The light guide plate 106 has a regular octagonal hole that matches the arrangement shape of the LED module 102 attached to the light holding unit 103 at the center. The LED 105 faces the incident end face 107 formed in a regular octagon of the light guide plate 106.

Japanese Patent Laying-Open No. 2011-222420 (FIG. 7)

When a light guide plate is used as in the conventional illumination device described in Patent Document 1 described above, it is general that the base end portion of the light guide plate is sandwiched and attached to the instrument body.
However, there is a problem that a gap is generated in the sandwiched portion, and light leaks from the gap, resulting in waste of light.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide an LED lighting apparatus that can efficiently illuminate while reducing waste of light.

An LED lighting apparatus according to the present invention is combined in an upper and lower direction, an apparatus main body having an upper cover and a lower cover that are continuous for a predetermined length in a direction orthogonal to the combination direction, and accommodated in the apparatus main body. A light source mounted on a substrate, a flat light guide plate whose base end is sandwiched along a boundary line between the upper cover and the lower cover, and whose incident end face faces the light source, and fixed to the lower cover And a presser fitting that supports the upper surface of the light guide plate, the light guide plate having a light emitting area exposed from the instrument body and a light incident area accommodated in the instrument body, A reflection member is provided at a position facing the light incident area on the inner side , the holding fixture includes a central light guide plate holding fixture and an end light guide plate holding fixture, and the light guide plate includes the central guide. Light plate presser The ingredients and the end portion light guide plate pressing fitting is intended to be fixed to the lower cover.

  In the LED lighting apparatus of the present invention, the reflecting member is provided along the mounting surface of the substrate.

  Furthermore, in the LED lighting apparatus according to the present invention, the reflection member has a sheet shape and is continuous from the upper surface of the light guide plate to the lower surface of the light guide plate through the front and back surfaces of the substrate.

  In the present invention, the light guide plate is fixed to the lower cover and attached by a presser fitting that supports the upper surface of the light guide plate. For this reason, the presser fitting can prevent generation of a gap through which light leaks, thereby eliminating waste of light. The light guide plate has a light emitting area exposed from the instrument body and a light incident area accommodated in the instrument body, and a reflecting member is provided at a location facing the light incident area inside the instrument body. For this reason, since the light which is incident from the incident end face and is immediately emitted from the light guide plate is reflected and returned to the light guide plate, an LED lighting apparatus having an effect of eliminating waste of light can be provided.

The perspective view which looked at the state which suspended the LED lighting fixture of embodiment which concerns on this invention with the wire from the ceiling surface from the downward direction The perspective view which looked at the LED lighting fixture of embodiment which concerns on this invention from upper direction The perspective view which looked at the state which removed the center upper cover and the one end upper cover in the LED lighting fixture of the embodiment concerning the present invention from the upper part Enlarged view of “IV” part in FIG. Sectional view of the VV position in FIG. Cross-sectional view of light emitting part and light guide plate with reflecting member attached A perspective view of the state where the end light guide plate holder is attached and the center light guide plate holder is removed, as viewed from above. (A) is explanatory drawing when a light guide plate is cut at right angles to form an incident end face and the LED substrate is tilted, and (B) is a light guide plate cut obliquely to form an incident end face and an LED substrate. Explanatory drawing when is installed vertically (A) is a plan view when the end portion of the light guide plate is screwed, and (B) is a plan view when the light guide plate is positioned by unevenness. The top view which shows the area | region which strengthens the slit provided near the fitting part provided in the corner part of a light-guide plate, and printing Explanatory drawing when LED lighting fixture is directly attached to the ceiling surface Cross-sectional view of a conventional lighting fixture

Hereinafter, the LED lighting fixture of embodiment which concerns on this invention is demonstrated using drawing.
As shown in FIGS. 1 and 2, the LED lighting apparatus 10 of the embodiment includes an apparatus main body 13 with a plurality of (here, four) wires (hanging members) 12 suspended from a ceiling surface (downward surface) 11. Can be used by hanging.
In the following description, the ceiling surface 11 side in the suspended state is referred to as “upper” and the side opposite to the ceiling surface 11 is referred to as “lower”.

The instrument main body 13 has a long rectangular shape, and has an upper cover 30 and a lower cover 20 that are combined vertically. Between the upper cover 30 and the lower cover 20, a pair of left and right light guide plates 40 described later is attached.
The upper cover 30 is a plate-like member having a curved cross section that protrudes upward, a central upper cover 301 that is attached between the wires 12 at both ends in the longitudinal direction, and an end upper cover that is attached to the end in the longitudinal direction from the wires 12. 302.

An insertion hole 31 for passing the wire 12 is provided at a boundary line 303 between the center upper cover 301 and the end upper cover 302. That is, one semicircle notch is formed on the center upper cover 301 side on the boundary line 303, and the other semicircle notch is formed on the end upper cover 302 side on the boundary line 303.
Therefore, the center upper cover 301 and the end upper cover 302 can be separately attached to and detached from the lower cover 20. FIG. 3 shows a state in which only one end upper cover 302 is attached.

As shown in FIGS. 3 and 4, the lower cover 20 of the instrument body 13 has a slightly convex curved section downward, and the upper cover 30 is detachably attached to the upper surface on the ceiling surface 11 side. It is done.
As shown in FIG. 5, the height dimension H1 along the combination direction (that is, the vertical direction) in the upper cover 30 is larger than the height dimension H2 of the lower cover 20.

As shown in FIG. 3 and FIG. 4, the lower cover 20 is provided with a pair of support rails 22 along the boundary between the upper cover 30 and the lower cover 20 along the longitudinal direction on the inner side in both ends in the width direction. ing. Connection portions 21 to which the wires 12 can be connected are respectively provided at both ends in the longitudinal direction of the support rail 22.
As shown in FIG. 5, a power supply unit 23 is provided inside the lower cover 20 between the pair of support rails 22.
The outer surface of the support rail 22 is inclined so that the upper end is located closer to the center of the lower cover 20 than the lower end.

As shown in FIGS. 4 and 5, an LED substrate (substrate) 242 constituting a light emitting unit (light source) 24 is attached to the outer surface of the support rail 22 along the longitudinal direction of the lower cover 20. The LED substrate 242 has an elongated rectangular shape, and an LED chip 241 is mounted on a mounting surface that is an outer surface. The LED chips 241 are arranged linearly along the longitudinal direction of the LED substrate 242.
Therefore, like the outer surface of the support rail 22, the LED substrate 242 has an upper end inclined toward the center of the lower cover 20 rather than the lower end. Further, the lower end portion of the LED substrate 242 is inserted into the groove 201 provided in the lower cover 20 along the outer surface of the support rail 22.

As shown in FIGS. 5 and 6, the light guide plate 40 located inside the light emitting unit 24 and the instrument body 13 is provided with a reflecting member 26.
The reflection member 26 has a sheet shape, and is continuously provided from the upper surface 402 of the light guide plate 40 to the lower surface 401 of the light guide plate 40 through the front and back surfaces of the LED substrate 242.
Further, the reflecting member 26 is provided over the entire length of the LED substrate 242 along the longitudinal direction of the mounting surface of the LED substrate 242.

Lower cover support surfaces 25 that support the lower surface 401 of the light guide plate 40 are provided on the upper surfaces of both ends in the width direction of the lower cover 20. On the upper side of the lower cover support surface 25, the tip end portion 304 of the upper cover 30 is located.
The light guide plate 40 includes a light incident area 406 located inside the instrument main body 13 constituted by the upper cover 30 and the lower cover 20, and a light emitting area 407 exposed outside the instrument main body 13.
The reflection member 26 described above is provided in the light incident region 406.

As shown in FIG. 5, the lower cover support surface 25 is inclined so that the outer end 251 is higher than the inner side, and is orthogonal to the outer surface of the support rail 22 and the LED substrate 242.
On the upper side of the lower cover support surface 25, a presser fitting for supporting the upper surface 402 of the light guide plate 40 is provided. As shown in FIG. 3 and FIG. 7, the presser fitting includes end light guide plate presser fittings (presser fittings) 42 provided at both longitudinal ends of the lower cover 20, and a center provided at the longitudinal center portion of the lower cover 20. A light guide plate pressing metal fitting (holding metal fitting) 41 is provided.

As shown in FIGS. 5 and 7, the central light guide plate holder 41 is attached to the lower cover 20 and is provided over the entire width of the lower cover 20 so as to include the left and right light emitting portions 24. The central light guide plate holder 41 is provided along the inner surface of the upper cover 30 to connect the pair of left and right light guide plate supports 411 that support the upper surface 402 of the light guide plate 40 and the pair of left and right light guide plate supports 411. A straddling portion 412 is provided.
The light guide plate support portion 411 can support the light guide plate 40 via the packing 413.

The end light guide plate holder 42 is attached to the lower cover 20 and is provided so as to cover the pair of left and right support rails 22. The end light guide plate pressing metal fitting 42 connects the light guide plate support portion 421 that supports the upper surface of the light guide plate 40, the cover portion 422 that covers the support rail 22 to which the light emitting portion 24 is attached, and the left and right cover portions 422. Part 423.
As described above, the light emitting unit 24 is covered with the end light guide plate pressing metal fittings 42 at both ends in the longitudinal direction and is covered with the central light guide plate pressing metal fittings 41 at the center in the longitudinal direction.

As shown in FIG. 5, between the left and right lower cover support surfaces 25 of the lower cover 20, and the light guide plate support portion 421 of the end light guide plate holder 42 and the light guide plate support portion 411 of the central light guide plate holder 41. The base end portion 403 of the light guide plate 40 is supported.
The light guide plate 40 is formed in a rectangular flat plate shape from a material having high light transmittance such as acrylic resin. The light guide plate 40 is attached such that the incident end face 405 faces the LED chip 241 of the light emitting unit 24.

The light guide plate 40 is attached so as to be inclined so that the distal end portion 404 is positioned higher than the base end portion 403. For this reason, the incident end surface 405 is inclined so that the upper end is located closer to the center of the lower cover 20 than the lower end, and the incident end surface 405 faces the LED substrate 242 substantially in parallel. The inclination angle θ of the light guide plate 40 is, for example, about 1 degree to 10 degrees.
The inclined front end portion 404 of the light guide plate 40 is positioned below the horizontal plane HL that passes through the uppermost portion of the upper cover 30.

As shown in FIG. 8A, here, the incident end surface 405 of the inclined light guide plate 40 is cut at right angles to the upper surface 402 and the lower surface 401, and the LED substrate 242 is inclined and faced in parallel. It was.
Thereby, the surface direction of the LED substrate 242 was set to be perpendicular to the surface direction of the light guide plate 40.
In addition, as shown in FIG. 8B, the LED substrate 242 is mounted vertically, and the end portion of the light guide plate 40 is cut obliquely with respect to the upper surface 402 (lower surface 401) to form the incident end surface 405. It is also possible for the end surface 405 to face the LED substrate 242 in parallel.

As shown in FIG. 9A, the light guide plate 40 has a longitudinal end 408 along the arrangement direction rather than a position where the end 408 of the LED chips 241 faces the LED chip 241E at the end in the arrangement direction. It is located in the outer region R1 protruding. The outer region R1 is provided with a fitting portion (concave portion) 43 that is cut out. The fitting portion 43 can be provided in a region where the irradiation light from the LED chip 241 is difficult to reach.
The fitting portion 43 performs positioning with respect to the lower cover 20 of the light guide plate 40 and is fixed to the lower cover 20 with screws 44.
Further, as shown in FIG. 9B, the positioning projection 27 provided on the lower cover 20 can be inserted into the fitting portion 43 of the light guide plate 40 for positioning.

The light guide plate 40 may be provided with slits on the upper surface 402 and the lower surface 401 or printed to control light distribution.
In this case, as shown in FIG. 10, in the region R2 where the light from the LED chip 241 is easily blocked by the screws 44 or the like, the light is diffused by densely providing slits or darkening the printing. Make it easier.
Thereby, a shadow becomes inconspicuous and uniform illumination light can be obtained.

The effect of the LED lighting apparatus will be described.
In the LED lighting device 10, the light emitting unit 24 in which the LED chip 241 is mounted on the LED substrate 242 is accommodated in the device main body 13. Between the upper cover 30 and the lower cover 20 of the instrument main body 13, a flat light guide plate 40 whose incident end face 405 faces the light emitting part 24 is provided, and a base end part 403 of the light guide plate 40 is sandwiched between them. Has been.
Then, since the height dimension H1 along the combination direction in the upper cover 30 is larger than the height dimension H2 of the lower cover 20, the light guide plate 40 is arranged such that the distal end portion 404 is located above the base end portion 403. Can be pinched.
Further, since the light guide plate 40 is sandwiched so that the distal end portion 404 is located higher than the base end portion 403, the upper cover 30 of the instrument body 13 is hidden and cannot be seen, and the lower cover 20 is not Since it is thin, a thin feeling of the entire LED lighting apparatus 10 can be obtained.

Further, the surface direction of the LED substrate 242 of the light emitting unit 24 is provided so as to be perpendicular to the surface direction of the light guide plate 40.
For this reason, since the light emitted from the light emitting unit 24 is directly incident on the incident end face 405 of the light guide plate 40, the incident efficiency is improved.

  Furthermore, since the instrument main body 13 has the connection part 21 which can connect the wire 12 suspended from the ceiling surface 11, it can be easily suspended from the ceiling surface 11.

In the LED lighting device 10, the light emitting unit 24 in which the LED chip 241 is mounted on the LED substrate 242 is accommodated in the device main body 13. Between the upper cover 30 and the lower cover 20 of the instrument main body 13, a flat light guide plate 40 whose incident end face 405 faces the light emitting part 24 is provided, and a base end part 403 of the light guide plate 40 is sandwiched between them. Has been.
The light emitting unit 24 has a strip shape in which the LED substrate 242 is continuous along the boundary line between the upper cover 30 and the lower cover 20, and each LED chip 241 is linearly arranged along the longitudinal direction of the LED substrate 242. Yes.

And the longitudinal direction edge part 408 along the sequence direction of each LED chip 241 in the light-guide plate 40 is located in an arrangement direction rather than the position which faces the LED chip 241E of the endmost part of each LED chip 241 in the arrangement direction. It is located in the outer region R1 projecting along. A fitting portion 43 that couples the instrument main body 13 and the light guide plate 40 is provided in the outer region R1.
For this reason, since the fitting part 43 which couple | bonds the instrument main body 13 and the light-guide plate 40 is arrange | positioned in the outer side area | region R1 which protruded from the LED chip 241E of the endmost part among the arranged LED chips 241, it is a fitting part. The amount of light irradiated to 43 can be reduced.
Thereby, the fitting part 43 is not conspicuous and unevenness can be reduced.

The lower cover 20 has a lower cover support surface 25 that supports the lower surface 401 of the light guide plate 40, and has a central light guide plate pressing metal fitting 41 and an end light guide plate holding metal fitting 42 that support the upper surface 402 of the light guide plate 40. .
Thereby, a light-guide plate can be clamped reliably.

In the LED lighting device 10, the light emitting unit 24 in which the LED chip 241 is mounted on the LED substrate 242 is accommodated in the device main body 13. Between the upper cover 30 and the lower cover 20 of the instrument main body 13, a flat light guide plate 40 whose incident end face 405 faces the light emitting part 24 is provided, and a base end part 403 of the light guide plate 40 is sandwiched between them. Has been.
The light guide plate 40 is fixed to the lower cover 20 and is attached by a central light guide plate holding metal fitting 41 and an end light guide plate holding metal fitting 42 that support the upper surface 402 of the light guide plate 40.

For this reason, the center light guide plate pressing metal fitting 41 and the end light guide plate holding metal fitting 42 can prevent generation of a gap through which light leaks, thereby eliminating light waste.
The light guide plate 40 has a light emitting area 407 exposed from the instrument body 13 and a light incident area 406 accommodated in the instrument body 13, and is reflected at a location facing the light incident area 406 inside the instrument body 13. A member 26 is provided.
For this reason, the light incident from the incident end face 405 and immediately emitted from the light guide plate 40 is reflected by the reflecting member 26 and returned to the light guide plate 40, so that waste of light can be eliminated.

Further, since the reflecting member 26 is provided along the mounting surface of the LED substrate 242, the reflecting member 26 reflects light that does not enter the incident end surface 405 out of light emitted from the LED chip 241 to the light incident region 406. Then, the light is incident on the light guide plate 40.
Thereby, waste of light can be eliminated.

Further, the sheet-like reflection member 26 is continuously provided from the upper surface 402 of the light guide plate 40 to the lower surface 401 of the light guide plate 40 through the front and back surfaces of the LED substrate 242.
For this reason, all the light emitted from the light emitting section 24 can be directed toward the incident end face 405 of the light guide plate 40, and waste of light can be eliminated. Further, the reflection member 26 can be easily attached.

The LED lighting apparatus of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the embodiment described above, the case where the two light guide plates 40 are provided on both sides in the width direction of the instrument main body 13 is illustrated, but the single wing provided only on one side of the instrument main body 13, a quadrilateral, or a square shape is provided. Four wings are also possible.

Moreover, although the case where it suspended with the wire 12 was illustrated in embodiment mentioned above, it is also possible to suspend with a rigid member like a support | pillar.
Furthermore, as shown in FIG. 11, the LED lighting device 10 can be directly attached to the ceiling surface 11. Even in this case, the front end portion 404 of the light guide plate 40 is located below the horizontal plane HL passing through the uppermost portion of the upper cover 30 and therefore does not hit the ceiling surface 11.

DESCRIPTION OF SYMBOLS 10 LED lighting fixture 13 Appliance main body 20 Lower cover 24 Light emission part (light source)
241 LED chip 242 LED substrate (substrate)
26 Reflecting member 30 Upper cover 40 Light guide plate 401 Lower surface 402 Upper surface 403 Base end portion 405 Incident end surface 406 Light incident area 407 Light emitting area 41 Central light guide plate pressing bracket (holding bracket)
42 End light guide plate holder (holder)

Claims (3)

An instrument body having an upper cover and a lower cover which are combined vertically and are continuous for a predetermined length in a direction orthogonal to the combination direction;
A light source housed in the instrument body and having a plurality of LED chips mounted on a substrate;
A flat light guide plate having a base end portion sandwiched along a boundary line between the upper cover and the lower cover, and an incident end surface facing the light source,
A holding fixture fixed to the lower cover and supporting the upper surface of the light guide plate;
The light guide plate has a light exit area exposed from the instrument body, and a light incident area accommodated in the instrument body,
A reflective member is provided at a location facing the light incident area inside the instrument body ,
The presser fitting has a central light guide plate presser fitting and an end light guide plate presser fitting,
The light guide plate is an LED lighting fixture fixed to the lower cover by the central light guide plate retainer and the end light guide plate retainer . In the LED lighting fixture of Claim 1,
The reflective member is an LED lighting apparatus provided along a mounting surface of the substrate. The LED lighting apparatus according to claim 2,
The LED luminaire that is in a sheet form and continues from the upper surface of the light guide plate to the lower surface of the light guide plate through the front and back surfaces of the substrate.

Images