JP4657248B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting apparatus having a flat housing used as a so-called pendant light or ceiling light.

In recent years, with the improvement of the luminous efficiency of white LEDs, the use as a light source for general illumination is expected to be expanded, and many types of pendant light type LED lighting fixtures using white LEDs as light sources are already on the market.
Taking advantage of the fact that each white LED as a light source is very small compared to conventional incandescent lamps and fluorescent lamps, these LED lighting fixtures have a small and thin design.

  Further, in Patent Document 1, a card-type LED illumination light source having a plurality of LEDs mounted on one side of a metal base substrate is detachably connected to a lighting circuit via a connector, and the back side of the substrate is one of the illumination devices. An LED lighting device is disclosed that is in thermal contact with a portion.

According to this configuration, power is supplied from the lighting circuit to each LED of the card-type LED illumination light source via the connector. Thereby, each LED emits light, and heat generated when each LED emits light is dissipated from the back surface of the substrate to a part of the lighting device. Thereby, even if LEDs are integrated at a high density on the substrate, each LED is held at a relatively low temperature by heat radiation. Thereby, since the luminous efficiency of each LED can be kept high, the light utilization efficiency is improved.
JP 2007-059930 A

By the way, in the conventional LED lighting fixture, including the LED lighting device according to Patent Document 1, a planar light source is configured by a plurality of LEDs, or an annular light source is configured. A light source as a substitute is configured.
Therefore, the illumination light and the appearance from the LED lighting fixture are almost the same as those of conventional lighting fixtures using incandescent lamps and fluorescent lamps as light sources, and it is difficult to say that they utilize the unique characteristics of LEDs.

Such a problem is the same not only when an LED is used but also when another light emitting element is used.
Further, not only the above-described pentant light type lighting fixtures but also so-called ceiling light type lighting fixtures or other types of lighting fixtures directly attached to the ceiling surface have the same problem.

  In view of the above, it is an object of the present invention to provide a lighting apparatus having a design and appearance that make use of the unique characteristics of a light emitting element.

According to the present invention, the object is to provide a housing (12) that is flat and open on one side, a substrate (13) housed in the housing (12), and mounted on the substrate (13). The first light emitting element (13a) and the second light emitting element (13b) arranged in the casing (12), and the casing (12) along the periphery of the casing (12). A light guide (15) arranged in a surrounding shape , wherein the light guide (15) includes an inner portion (17) surrounding the housing (12) and the light guide ( 15) is divided into an outer portion (18) surrounding the inner portion (17), and the first light emitting element (13a) emits light in a direction in which the housing (12) is opened. And the inner part (17) of the light guide (15) is connected to the second light emitting element (1). a position opposed to b), the second includes the optical axis and concentric conical recess of the light emitting element (13b) (17a), lighting fixtures, characterized in that, the, is achieved.

  In the lighting fixture according to the present invention, preferably, the first light emitting element and the second light emitting element are mounted on one substrate accommodated in the casing.

  According to the said structure, the housing | casing of a lighting fixture is suspended from a ceiling, for example, or it attaches directly to a ceiling surface. Thereby, it is used as a pendant light or a ceiling light, and light from the first light emitting element in the casing is emitted in the opening direction of the casing. For this reason, the floor surface of a room, a desk, a dining table, etc. are illuminated in the light emission direction, for example, the lower part of a lighting fixture.

Further, each light emitting element is driven and each light emitting element emits light. Light emitted from each light emitting element is incident on the light guide and is repeatedly reflected in the light guide to be diffused in the peripheral direction.
Thereafter, the light in the light guide is diffused substantially uniformly as seen in the entire peripheral direction, and then exits from the outer peripheral surface to the outside.

  Thereby, when this luminaire is observed from the outside, the vicinity of the outer peripheral edge of the casing of the luminaire appears to shine in a uniform line by the diffused light from the second light emitting element. Therefore, the outer peripheral edge of the luminaire shines linearly as compared with the conventional luminaire. As a result, a novel appearance utilizing the characteristics of light emitting elements such as LEDs is provided.

  In this case, the linear illumination of the outer peripheral edge is performed by the light emitting element arranged to face the light guide arranged along the peripheral edge of the casing. For this reason, power consumption is small and the temperature rise is relatively small.

  In addition, a relatively small number of light-emitting elements may be used as light-emitting elements due to the diffusion effect of the light guide. For this reason, it is possible to improve the commercial value of the lighting fixture at a low cost with a simple configuration.

  When the casing is flat, the whole can be configured in a small size. Moreover, when this lighting fixture is attached to a ceiling surface or a wall surface, an occupied space can be reduced.

  When the illumination lens arranged so as to close the open surface of the housing is provided, the light emitted from the first light emitting element is irradiated to the outside through the illumination lens. Therefore, a predetermined light distribution characteristic can be imparted by the illumination lens.

  When the light guide has a shape surrounding the casing along the periphery of the casing, the light guide is visually integrated with the casing, and the appearance is improved. become.

  When the light guide is divided into an inner portion and an outer portion in the radial direction, the light emitted from the second light emitting element enters the inner portion of the light guide and enters the inner portion of the light guide. And repeat the reflection. Thereby, it is diffused in the peripheral direction. Thereafter, the light emitted outward from various portions of the inner portion of the light guide is incident on the outer portion of the light guide, and is repeatedly reflected in the outer portion of the light guide. As a result, the light is diffused almost uniformly as seen in the entire peripheral direction, and then emitted from the outer peripheral surface to the outside. Accordingly, the light emitted from the second light emitting element is diffused in the peripheral direction in two stages, that is, the inner part and the outer part of the light guide, so that the light is more uniformly diffused in the peripheral direction.

  When the second light emitting element is disposed so as to face the upper surface or the lower surface of the inner part of the light guide, or when disposed to face the inner peripheral side wall of the inner part of the light guide, The light emitted from the second light emitting element enters the inside from the upper surface, the lower surface or the inner peripheral side wall of the inner portion of the light guide.

  When the inner part and the outer part of the light guide are configured separately and are completely separated, the inner part and the outer part are respectively molded and assembled into optimum shapes.

  When the inner part and the outer part of the light guide are integrally formed and the boundary is defined by a slit, the inner part and the outer part need not be aligned with each other. Can be easily performed.

  When the inner portion of the light guide is provided with a conical concave portion concentric with the optical axis of each light emitting element and having an apex angle of approximately 90 degrees at a position facing each light emitting element, the optical axis from each light emitting element. The light emitted in the direction is totally reflected by this conical recess and diffuses around the horizontal direction. Thereby, the utilization efficiency of the light from each light emitting element improves.

  The inner part of the light guide consists of a substantially parabolic pillar surface having a focal point on the central axis of a flat or conical recess at a radial position corresponding to each light emitting element on its outer surface and / or inner surface. When the V-shaped notch is provided, the light directly emitted from each light emitting element to the side or the light that is totally reflected by the conical recess in the inner portion of the light guide and proceeds to the side The light is totally reflected at the cutout portion, becomes diffused light or parallel light, and is reflected along the peripheral direction of the inner portion of the light guide. Thereby, the utilization efficiency of the light from each light emitting element improves.

  When the outer peripheral surface and / or the inner portion of the outer portion of the light guide are formed so as to have a light diffusion effect, when light is emitted from the outer peripheral surface of the inner portion of the light guide, Diffused. Further, when light is emitted from the outer peripheral surface of the outer portion of the light guide to the outside, the light is similarly diffused. Therefore, the light emitted to the outside from the outer portion of the light guide becomes more uniform.

  When the first light-emitting element and the second light-emitting element are mounted on a single substrate housed in the housing, the number of components as a whole can be reduced and the structure can be made smaller. become.

  In this way, according to the present invention, a lighting fixture having a design and appearance utilizing the characteristics unique to the light emitting element can be provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

[Example 1]
FIG.1 and FIG.2 has shown the structure of 1st embodiment of the lighting fixture by this invention.
1 and 2, a lighting fixture 10 is a pendant light type lighting fixture, and is in order from the top, from a support pipe 11, a housing 12, an LED substrate 13, a lighting lens 14, a light guide 15, and a surface cover 16. It is configured.

The support pipe 11 is for supporting the entire lighting fixture 10 in a state suspended from the ceiling.
The support pipe 11 has a lower end fixed to the housing 12 and an upper end fixed to a ceiling of a room (not shown).

The casing 12 is formed in a flat disk shape, and its peripheral edge extends downward and its lower part is open.
Here, the casing 12 is made of a material having a good thermal conductivity, and thus acts as a heat sink to dissipate heat generated by the LEDs mounted on the LED board 13 described later. ing.

In the illustrated case, the LED substrate 13 is formed in a disk shape, and is disposed in the housing 12 in close contact with the inner lower surface of the housing 12 in the housing 12.
The LED board 13 has a plurality of white LEDs 13a for main illumination as a first light emitting element mounted on the lower surface of the central region.

The LED substrate 13 is mounted with a plurality of (four in the illustrated example) white LEDs 13b for illumination as second light-emitting elements distributed at equal angular intervals on the lower surface of the peripheral region. Yes.
These white LEDs 13 a and 13 b are arranged so that their optical axes extend substantially vertically downward with respect to the LED substrate 13.

  Further, the LED board 13 is provided with a drive circuit (not shown) for driving the white LEDs 13a and 13b described above, and a power cord from the drive circuit passes through the support pipe 11 and the ceiling of the room or the like. It is routed to the back and connected to the indoor wiring.

The illumination lens 14 has a flat circular outer shape, and the size thereof is selected so as to correspond to the central region of the LED substrate 13.
As shown in FIG. 2, the illumination lens 14 has a distal end of a mounting leg 14 a that extends upward at equal angular intervals at the periphery, and engages with an engagement hole 13 c provided at a corresponding position of the LED substrate 13. By doing so, it is positioned with respect to the LED substrate 13 and is fixed and held by caulking or the like, for example.
As a result, the illumination lens 14 irradiates the light emitted from each white LED 13a for main illumination downward so as to have a desired light distribution characteristic.
Therefore, for example, a floor surface of a room, a desk, a dining table, or the like can be illuminated with desired light distribution characteristics below the lighting fixture 10.

In the illustrated case, the light guide 15 is divided into an inner portion and an outer portion in the radial direction, and is composed of an inner first light guide 17 and an outer second light guide 18 that are separate from each other. Yes.
Here, as shown in FIGS. 3 and 4, the first light guide 17 and the second light guide 18 are arranged at the same height position with respect to the LED board 13, and the first light guide 17. The outer peripheral edge of the second light guide 18 and the inner peripheral edge of the second light guide 18 are opposed to each other with a slight gap.
The first light guide 17 and the second light guide 18 are formed from a material having translucency with respect to the white LED 13 b mounted on the LED substrate 13.

As shown in FIGS. 3 and 4, the first light guide 17 is formed in a slightly flat annular shape.
As shown in FIG. 5 (A), the first light guide 17 has a surface opposite to the white LED 13b on the side opposite to the white LED 13b, that is, the lower surface of the white LED 13b. A conical recess 17a concentric with the optical axis is provided.
As shown in FIGS. 5 (A) and 6 (B), the conical recess 17a has an apex angle of approximately 90 degrees. As a result, the light L1 incident on the corresponding first light guide 17 from the illumination white LED 13b on the LED substrate 13 is incident on the conical recess 17a concentric with the optical axis from the inside, so that Will be totally reflected.

Further, as shown in FIGS. 3 and 4, the first light guide 17 is disposed at the same radial position as the conical recess 17 a on the radially outer surface and inner surface of the conical recess 17 a described above. A notch 17b is provided.
The notch 17b extends obliquely in the circumferential direction around the above-described position, and forms a substantially V-shaped groove in the horizontal direction.

Here, the notch portion 17b is more specifically composed of a flat surface, or is composed of a parabolic column surface obtained by translating a parabola focusing on the central axis of the conical recess 17a in the direction of the central axis. Yes.
Thus, as shown in FIG. 6A, of the light totally reflected in all directions by the conical recess 17a as described above, in the radial direction, that is, in the inner side surface and the outer side surface direction of the first light guide 17. The reflected light L2 enters the cutouts 17b from the inside. For this reason, this light is totally reflected and travels along the peripheral direction of the first light guide 17.
At that time, when the notch portion 17b is formed from a parabolic column surface, the light reflected by the inner surface of the notch portion 17b becomes substantially parallel light along the peripheral direction of the first light guide 17. Will go on.

Further, the first light guide 17 is configured such that the outer peripheral surface facing the second light guide 18 diffuses the transmitted light by rough surface processing such as embossing or embossing, or knurling. It is formed so as to have a light diffusion effect.
The first light guide 17 includes a screw hole 17c through which a fixing screw for fixing the front cover 16 to the housing 12 is passed.
These screw holes 17c are preferably arranged in the vicinity of the middle between two conical recesses 17a adjacent to each other.
As a result, the light is sufficiently guided in the first light guide 17, and the emitted light intensity to the outside becomes substantially uniform in the peripheral direction.

As shown in FIGS. 3 and 4, the second light guide 18 is formed in a slightly flat annular shape, and the height thereof is selected to be substantially the same as that of the first light guide 17.
The second light guide 18 has an outer peripheral surface that diffuses transmitted light by a rough surface processing such as embossing or embossing, or a knurled cut made of a concave R or a convex R, that is, has a light diffusing effect. It is formed to have.

The surface cover 16 is made of a light-impermeable material or is coated with a light-impermeable paint so as to have a light-impermeable property and is formed in an annular shape.
The outer diameter of the surface cover 16 is substantially the same as the outer diameter of the housing 12. The inner diameter is slightly smaller than the illumination lens 14 and covers the periphery of the illumination lens 14.
Further, the surface cover 16 is provided with a plurality (four in the illustrated example) of screw holes 16a at equiangular intervals along the periphery.
Thus, the fixing screw 16b is inserted into the screw hole 16a, and the light guide 15, that is, the first light guide 17 and the second light guide 18 are sandwiched between the surface cover 16 and the LED board 13, so that the surface cover is covered. 16 is fixedly held to the mounting boss 12 a of the housing 12.
Further, the screw hole 16a of the surface cover 16 is covered with a screw hole cover 16c.

In addition, the said housing | casing 12 is equipped with the uneven | corrugated shape 12a, as shown in FIG. 7, in order that the upper surface may raise the heat dissipation effect.
As a result, heat at the time of driving the white LEDs 13a and 13b is transmitted from the LED substrate 13 in close contact with the inner lower surface of the housing 12 to the housing 12, and is released to the outside air by the uneven shape 12a. The white LEDs 13a and 13b can be dissipated.

The lighting fixture 10 by this embodiment is comprised as mentioned above, and the lighting fixture 10 can be used as a pendant light by attaching the upper end of the support pipe 11 to the ceiling etc. of a room.
Power is supplied to the drive circuit of the LED board 13 from indoor wiring such as the back of the ceiling. Thereby, each white LED 13a, 13b is driven and emits light.
Here, the light emitted from the white LED 13a for main illumination is emitted downward through the illumination lens 14, and for example, the floor surface of the room, the desk, the dining table, and the like are illuminated.

In contrast, the light emitted from the white LED 13b for illumination enters the first light guide 17 of the opposing light guide 15, is totally reflected by the inner surface of the conical recess 17a, and travels in all directions. move on.
Further, of the light that is totally reflected by the conical recess 17a and travels in all directions, the light that travels to the side, that is, radially inward and outward, is totally reflected by the inner surface of the cutout portion 17b and diffused light or It becomes parallel light and travels in the first light guide 17 along the peripheral direction.

  The light traveling in the circumferential direction in the first light guide 17 in this way is repeatedly reflected in the first light guide 17. Thereby, it guide | induces in the 1st light guide 17 whole, and radiate | emits outside from each place of the outer peripheral surface. As a result, substantially uniform light is emitted from the outer peripheral surface to the outside over the entire circumference of the first light guide 17, and rough surface processing such as embossing and embossing on the outer peripheral surface and knurling cut are performed at the time of emission. Due to the above processing, the light is incident from the inner peripheral surface of the second light guide 18 in a diffused and more uniform state.

  The light incident on the second light guide 18 is repeatedly reflected in the second light guide 18. As a result, it is diffused almost uniformly after being understood in the entire peripheral direction, and then emitted to the outside from the outer peripheral surface. Upon exiting, the outer peripheral surface is subjected to rough surface processing such as embossing, embossing, and knurling processing. The light is diffused and emitted to the outside in a more uniform state.

  Therefore, when the lighting fixture 10 is observed from the outside, light is irradiated downward through the illumination lens 14. As a result, normal illumination is performed, and the outer peripheral edge of the housing 12 is linear with the diffused light from the outer peripheral surface of the second light guide 18 near the outer peripheral edge of the flat housing 12 of the luminaire 10. It will look shining. For this reason, a novel appearance utilizing the characteristics of the white LED 13b can be obtained.

  Further, the heat generated when the white LEDs 13 a and 13 b on the LED board 13 are driven is transmitted from the LED board 13 to the housing 12, and is released to the outside through the uneven shape 12 a on the upper surface of the housing 12. For this reason, the temperature of white LED13a, 13b does not rise, and such luminous efficiency does not fall.

[Example 2]
FIG. 8 shows a configuration of a second embodiment of the lighting fixture according to the present invention.
In FIG. 8, since the lighting fixture 20 is the structure substantially the same as the lighting fixture 10 shown in FIG. 1, the same code | symbol is attached | subjected to the same component and the description is abbreviate | omitted.
The lighting fixture 20 differs from the lighting fixture 10 shown in FIG. 1 only in that it includes a light guide 21 in which a first light guide 17 and a second light guide 18 are integrally formed. Yes.

In the light guide 21, the first light guide 17 and the second light guide 18 described above are integrally connected by connecting portions 22 arranged at equal angular intervals. Further, in portions other than the connecting portion 22, a slit 23 is defined therebetween.
Thus, the light guide 21 acts in the same manner as the light guide 15 including the first light guide 17 and the second light guide 18 which are separate from each other in the lighting apparatus 10 of FIG.

  According to the lighting fixture 20 comprised in this way, it acts similarly to the lighting fixture 10 of FIG. Further, the first light guide 17 and the second light guide 18 are integrally formed with each other. Therefore, mutual positioning of the first light guide 17 and the second light guide 18 is not necessary. Further, the first light guide 17 and the second light guide 18 are supplied as one part (light guide 21), the number of parts is reduced, and the assembly can be easily performed.

  In the above-described embodiment, the housing 12 is attached to the ceiling of the room via the support pipe 11 and used as a pendant light that emits light downward. It is obvious that it may be used as a ceiling light, attached to the ceiling of a room, etc., or used as another kind of lighting fixture that is attached to a wall surface etc. and emits light in other directions. is there. In the above-described embodiment, the white LEDs 13a and 13b are used for main illumination and illumination. However, the present invention is not limited to this, and other light emitting color LEDs or a plurality of light emitting color LEDs are used. It is clear that the main lighting and / or illumination may be performed by color mixing.

Furthermore, in embodiment mentioned above, although LED is used as a light source, not only this but another light emitting element may be used.
In the above-described embodiment, the white LED 13b for illumination is disposed so as to face the upper surface of the first light guide 17. However, the present invention is not limited to this, and faces the lower surface of the first light guide 17. May be arranged.
Alternatively, in the above-described embodiment, a so-called side-view type surface-mounted LED may be disposed as opposed to the inner peripheral side wall of the first light guide 17 as the illumination white LED 13b.

  Further, in the above-described embodiment, the housing 12 is formed in a flat disk shape, and the light guide 15 or 21 is also formed in an annular shape in accordance with this, but the present invention is not limited to this. 12 has a flat or non-flat elliptical shape or a different outer shape according to the use of the lighting fixture, and the outer shape of the light guides 15 and 21 may be formed in accordance with this shape. it is obvious.

In the above-described embodiment, the light emitted from the first light emitting element is irradiated to the outside through the illumination lens, but it is obvious that the illumination lens may be omitted.
In the above-described embodiment, the light guide 15 or 21 is disposed on the inner side of the peripheral edge of the housing 12, but is not limited thereto, and may be disposed on the outer peripheral surface of the housing 12. Is clear.

  In this way, according to the present invention, an extremely excellent lighting fixture having a design and appearance that make use of the characteristics unique to the light emitting element can be provided.

It is the perspective view seen from the lower part which shows the structure of 1st embodiment of the lighting fixture by this invention. It is a disassembled perspective view of the lighting fixture of FIG. It is a disassembled perspective view which shows the structure of the principal part in the lighting fixture of FIG. It is a partial bottom view of the state which removed the surface cover in the lighting fixture of FIG. FIG. 2 is a partial enlarged cross-sectional view passing through an illumination LED in the vicinity of the periphery of the lighting apparatus of FIG. 1, (B) a partial enlarged cross-sectional view passing through a mounting screw, and (C) a partial enlarged cross-sectional view of other portions. It is the (A) enlarged plan view and the (B) enlarged side view which show the structure of LED vicinity of the 1st light guide in the lighting fixture of FIG. It is the perspective view seen from the top which shows the shape of the upper surface of the housing | casing in the lighting fixture of FIG. It is the disassembled perspective view seen from the lower part which shows the structure of 2nd embodiment of the lighting fixture by this invention. It is a perspective view which shows the whole structure of the light guide in the lighting fixture of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lighting fixture 11 Support pipe 12 Case 12a Uneven shape 13 LED board 13a White LED for main illumination (1st light emitting element)
13b White LED for illumination (second light emitting element)
DESCRIPTION OF SYMBOLS 14 Illumination lens 15 Light guide 16 Surface cover 17 1st light guide 17a Conical recessed part 17b Notch part 18 2nd light guide 20 Lighting fixture 21 Light guide 22 Connection part 23 Slit

Claims (2)

A flat housing (12) open on one side ;
A substrate (13) housed in the housing (12);
A first light emitting element (13a) and a second light emitting element (13b) mounted on the substrate (13) and disposed in the housing (12);
A light guide (15) disposed in a shape surrounding the casing (12) along the periphery of the casing (12) , and a lighting fixture comprising:
The light guide (15) is divided into an inner part (17) surrounding the housing (12) and an outer part (18) surrounding the inner part (17) of the light guide (15),
The first light emitting element (13a) emits light in a direction in which the housing (12) is opened,
An inner portion (17) of the light guide (15) is conically recessed (17a) concentric with the optical axis of the second light emitting element (13b) at a position facing the second light emitting element (13b). The lighting fixture characterized by comprising. The first light emitting element and the second light emitting element, characterized in that said being mounted in the housing to the contained one substrate, luminaire of claim 1, wherein.

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