JP2017130366A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting apparatus capable of irradiating an upper end of a wall surface with a light and irradiating a region over a wide range of the wall surface with a high-uniformity light without impairing a good appearance of a ceiling portion.SOLUTION: The present invention relates to a lighting apparatus W which is installed while being embedded in a ceiling interior part, and irradiates a wall surface with a light from an opening that is formed on a ceiling surface. The lighting apparatus comprises: a light source unit 10; a reflector plate 20 which reflects a light emitted from the light source unit 10; and a diffuser plate 30 which is disposed between the reflector plate 20 and the ceiling surface. The diffuser plate 30 includes: an orthogonal surface 30a which is separated from the ceiling surface to an upper side by a predetermined dimension and orthogonal to a center optical axis of a light source; and an inclined surface 30b which is refracted from one end of the orthogonal surface 30a to the side of the ceiling surface and extends towards the ceiling surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting fixture, for example, relates to a lighting fixture that is embedded in a ceiling and irradiates light toward a wall surface from an opening formed in the ceiling surface.

Conventionally, wall washer-type downlights with various configurations have been proposed as lighting fixtures that irradiate light on a wall surface.
For example, a conventional wall washer-type downlight (hereinafter simply referred to as “downlight”) having the configuration shown in FIG. 5 is known.

  The illustrated downlight 100 is a lighting fixture that is embedded and installed in the ceiling C so that the irradiation port faces downward, and includes a heat sink 101, a light source unit 110 attached to one end of the heat sink 101, and a light source unit 110. A reflecting plate 120 that reflects light emitted from the light source unit 110, a diffusion plate 130 that diffuses and transmits light emitted from the light source unit 110, a trim (frame body) 140 that forms an outer frame of the downlight 100, and the downlight 100. Is attached to the ceiling C surface. Note that reference numeral 160 in the figure denotes a cone. The cone 160 guides light emitted from the diffusion plate 130 downward, and when the downlight 100 is embedded and installed in the ceiling C, the inner peripheral surface of the trim 140 and the interior of the ceiling cannot be seen from below. So that it covers.

  The downlight 100 is supported by the trim 140 in a state where the “heat sink 101, the light source unit 110, the reflection plate 120, and the diffusion plate 130” are inclined at a predetermined angle (15 ° in the drawing) with respect to the horizontal plane. The light from 110 is irradiated toward the wall surface.

Moreover, the illumination apparatus of the structure described in patent document 1 is proposed as a wall washer type downlight of a prior art. This illumination device uses a specially processed diffusion sheet to deflect light from the light source toward the wall surface and irradiate the wall surface.
Specifically, the illumination device described in Patent Document 1 includes a light source and a diffusion sheet that deflects light from the light source. In this illumination device, the light from the light source is set so that the 1/2 beam angle is 0.1 to 30 degrees. Further, the diffusion sheet has a light incident surface on which light from the light source enters and a light output surface from which light from the light source emits, and a concavo-convex structure is formed on the light incident surface and / or the light output surface. The light exit surface is provided with a first region for diffusing light from the light source to emit light, and a second region for diffusing light from the light source at an angle different from the diffusion angle in the first region to emit light. It has been.

  In addition, as a wall washer type downlight that is currently on the market, there is known a configuration that can irradiate light on the upper surface of the wall surface using a diffusion plate that protrudes from the ceiling mounting surface (non-patent document). 1).

JP 2011-54333 A "Lighting fixture search NDNN73100 LZ9 Ceiling-embedded LED (lunch white) wall washer downlight" [online], Panasonic Corporation [searched December 22, 2015], Internet <URL: http://www2.panasonic .biz / es / catalog / lighting / products / detail / shouhin.php? at = mvdetail & ct = zentai & id = S00069969 & hinban = NDNN73100>

However, the above-described prior art has the following problems.
Specifically, the downlight 100 of the prior art shown in FIG. 5 is configured by inclining the “heat sink 101, light source unit 110, reflector 120, and diffuser 130” installed inside the ceiling with respect to the horizontal plane. The wall surface is configured to irradiate light, and the configuration has a problem that it is difficult to irradiate the upper end of the wall surface with light. Further, since the downlight 100 of the prior art is irradiated with light from the downlight 100 in substantially the same direction, it has not been possible to irradiate light over a wide area of the wall surface.

Moreover, since the illuminating device of patent document 1 uses the diffusion sheet which needs special processing, it has a subject by the availability of components.
Moreover, although the illuminating device described in Non-Patent Document 1 is advantageous in terms of the availability of parts as compared with that described in Patent Document 1, the diffuser plate protrudes from the ceiling mounting surface. Invite the problem of losing.

  The present invention has been made in order to solve the above-mentioned problems, and the object thereof is to irradiate light on the upper end of the wall without impairing the aesthetic appearance of the ceiling and to provide a high degree of uniformity in a wide area of the wall. It is to provide a lighting apparatus that can emit light without using any special parts.

  The present invention made to solve the above problems is a lighting fixture that is embedded in a ceiling and irradiates light from an opening formed on the ceiling surface toward a wall surface, the light source unit, and the light source unit A reflector that reflects light emitted from the reflector, and a diffuser that is disposed between the reflector and the ceiling surface and diffuses and transmits the light, the diffuser plate being located above the ceiling surface An orthogonal plane that is spaced apart by a predetermined dimension and orthogonal to the center optical axis of the light source, and an inclined plane that is refracted from one end of the orthogonal plane toward the ceiling surface and extends toward the ceiling surface. It is characterized by that.

According to this configuration, when the lighting fixture of the present invention is installed on the ceiling portion in the vicinity of the wall surface (wall surface substantially perpendicular to the ceiling), the light emitted from the light source unit is incident on the diffusion plate. The diffused light is diffused and transmitted by the diffusion plate and is irradiated toward the wall surface.
Specifically, out of the light incident on the diffuser plate, the light incident on the orthogonal plane orthogonal to the central optical axis of the light source is diffused and transmitted by the orthogonal plane to the upper side of the wall surface (from the upper end of the wall surface). Irradiation is performed from the lower side of the predetermined dimension) to the lower side. Of the light incident on the diffuser plate, the light incident on the inclined surface is refracted and diffused and transmitted through the inclined surface from the upper end of the wall surface to the upper side of the wall surface (the upper end portion of the wall surface D). To a position below a predetermined dimension). That is, in the present invention, the diffuser plate has a structure including an orthogonal surface and an inclined surface orthogonal to the central optical axis of the light source, so that light can be irradiated to the upper end portion of the wall surface and from the upper end portion of the wall surface. It is possible to irradiate light with a high degree of uniformity on a wide area on the lower side.
In addition, the present invention provides a first region that forms a concavo-convex structure on the light incident surface and the light exit surface and diffuses light from the light source on the light exit surface and emits light, such as the diffusion plate described in Patent Document 1. Because it uses a diffusion plate with a simple structure instead of a `` provided second region that diffuses and emits light from the light source at an angle different from the diffusion angle in the first region, Patent Document Compared to the one described in 1, it can be manufactured without using special materials.
Further, the diffusion plate of the present invention is disposed between the reflection plate and the ceiling surface, and unlike the downlight of Non-Patent Document 1, the diffusion plate is not configured to protrude from the ceiling surface. There is no loss of aesthetics.

Further, it is desirable that the light source unit is installed so that a central optical axis of emitted light is located on the inclined surface side of the diffusion plate.
With this configuration, more light from the light source unit can be incident on the inclined surface side than the orthogonal surface orthogonal to the central optical axis of the light source of the diffuser plate. As a result, light is irradiated on the upper end side of the wall surface. can do.

In addition, the reflection plate is formed with an incident opening that surrounds the light emitted from the light source unit at the upper end, and a hollow bowl-shaped reflection in which an emission opening that emits the incident light is formed at the lower end. And a sub-reflector that extends from the vicinity of the exit port to the vicinity of the outer peripheral edge of the inclined surface of the diffuser plate. It is desirable to be provided.
With this configuration, the light incident on the region between the exit of the reflector and the outer peripheral edge of the inclined surface of the diffuser is reflected by the sub-reflector and is incident on the inclined surface of the diffuser. Become. That is, by providing the sub-reflecting plate, more light can be efficiently guided to the inclined surface of the diffusion plate, and as a result, light can be irradiated to the upper end side of the wall surface.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting fixture which can irradiate the light of a wall surface upper end part, and can irradiate the light of a high degree of uniformity to the wide area | region of a wall surface without impairing the beauty | look of a ceiling part is provided, without using a special component. be able to.

It is the schematic diagram which showed the structure of the downlight of embodiment of this invention. It is the schematic diagram which showed the optical path of the downlight of embodiment of this invention. It is a wall surface illuminance distribution map of the downlight of the embodiment of the present invention. It is a wall surface illuminance distribution map of the downlight of the prior art shown in FIG. It is the schematic diagram which showed the structure of the downlight of a prior art.

  Hereinafter, a downlight (lighting fixture) according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the downlight (wall washer type downlight) W of this embodiment is a heat sink 1, a light source unit 10 attached to one end of the heat sink 1, and light emitted from the light source unit 10. The reflecting plate 20 to be reflected, the diffusion plate 30 that diffuses and transmits the light emitted from the light source unit 10, the trim (frame body) 40 that forms the outer frame of the downlight W, and the downlight W on the ceiling C surface An attachment spring 50 for fixing and a cone 60 for closing a gap between the diffusion plate 30 and the trim 40 are provided.

  The heat sink 1 has a function of dissipating heat generated in the light source unit 10, and is formed of a metal having high thermal conductivity such as aluminum. Although the shape of the heat sink 1 is not particularly limited, in the present embodiment, the heat sink 1 includes a prismatic main body (not shown) and a plurality of cooling fins ( (Not shown).

The light source unit 10 emits light by power supplied from a power supply unit (not shown).
Specifically, the light source unit 10 includes an optical substrate (COB (Chip On Bord)) insulating plate 11 attached to one end of the heat sink 1 and an optical substrate (COB) 12 attached to the optical substrate insulating plate 11. And a silicon cover 13 that covers the optical substrate 12. The silicon cover 13 is formed in a substantially dome shape so that light emitted from the optical substrate 12 is transmitted therethrough.
The light source unit 10 (the optical substrate insulating plate 11, the optical substrate 12, and the silicon cover 13) is sandwiched between the heat sink 1 and the optical substrate holder 81 fixed to the heat sink 1.
Since the configuration of the optical substrate (COB) 12 is a well-known technique, a detailed description thereof is omitted.

Further, the light source unit 10 is installed so that the central optical axis of the emitted light is positioned on the “inclined surface 30 b (described later) side” of the diffusion plate 30. Specifically, the light source unit 10 has a center optical axis of emitted light based on a boundary portion between “an orthogonal surface 30a (described later) with respect to the center optical axis of the light source” and “an inclined surface 30b” of the diffusion plate 30. Thus, it is arranged so as to pass through a position separated by X mm (for example, X = 5 mm) on the “inclined surface 30b” side.
With this configuration, a larger amount of light from the light source unit 10 is incident on the inclined surface 30 b side than the “plane 30 a orthogonal to the central optical axis of the light source” of the diffusion plate 30.

  The reflecting plate 20 has an entrance 20a1 disposed so as to surround the silicon cover 13 at the upper end thereof, and a hollow bowl-shaped reflecting portion 20a in which an exit 20a2 is formed at the lower end thereof. A flange portion 20b that is bent and extended from the side 20a2 radially and outward at a substantially right angle, and a reinforcement portion 20c that is bent and extended at a substantially right angle from the radial direction and the outer end of the flange portion 20b toward the entrance 20a1. I have. The inner diameter of the reflecting portion 20a gradually increases from the incident port 20a1 toward the exit port 20a2, and a reflecting surface is formed on the inner peripheral surface thereof.

Further, the reflection plate 20 is supported by a connection fitting (arm) (not shown) fixed to the trim 40.
In addition, a sub-reflecting plate 70, which will be described later, fixed to the trim 40 is disposed on the lower end portion (end portion on the emission port 20 a 2 side) side of the reflecting plate 20.

  The diffusing plate 30 is formed in a substantially square shape in cross-sectional view (formed in a substantially circular shape in plan view), and is diffused so as to be positioned between the exit 20a2 of the reflecting plate 20 and the ceiling C surface. It is supported by the trim 40 via a plate mounting bracket 83. That is, the diffusion plate 30 is disposed at a position that does not protrude downward from the ceiling C surface when the downlight W is embedded and installed inside the ceiling C.

  Specifically, the diffusing plate 30 is spaced apart from the ceiling C surface by a predetermined dimension and is orthogonal to the center optical axis of the light source. An inclined surface 30b) and an inclined surface 30b refracted from one end of the orthogonal surface 30a with respect to the central optical axis of the light source toward the ceiling C surface and extending toward the ceiling C surface (a semicircular inclined surface 30b in plan view) Here, the inclined surface 30b is inclined “θ °” with respect to the lower surface of the trim 40 forming the lower end of the downlight W.

Further, the inclination angle of the inclined surface 30b is not particularly limited, and is appropriately designed according to the installation position (distance to the wall surface) of the downlight W. For example, the inclined plate 30 is formed to have an “inclination angle θ = 30 °”.
The diffusing plate 30 is manufactured, for example, by molding a raw material in which light diffusing particles having a predetermined particle diameter are mixed with a molding powder of an electrically insulating transparent material (for example, a transparent acrylic resin). In addition, the diffusion plate having such a function is used, for example, for a backlight diffusion plate of a liquid crystal display or a shade of a lighting fixture.

The trim (frame body) 40 has a substantially hollow cylindrical main body portion 40a having both ends opened, and an outer flange portion 40b projecting from the one end (lower end) of the main body portion 40 in the radial direction and at a substantially right angle, The main body part 40a is provided with the inner collar part 40c which protrudes from the one end (lower end) of the main-body part 40a to the radial direction and the inner side at substantially right angle.
A diffusion plate mounting bracket 83 (for example, a Z-shaped bracket) is fixed to the other end (upper end) of the main body 40a by a fixing means such as a bolt. Note that a surface 30 a orthogonal to the center optical axis of the light source of the diffusion plate 30 is fixed to the diffusion plate mounting bracket 83.
Further, the “mounting spring 50” is fixed to the outer peripheral side surface portion of the main body portion 40a by using a fixing means such as a bolt. Note that the “mounting spring 50” has the same structure as that of the well-known technique, and thus the description thereof is omitted.

  Further, a connection fitting (arm) (not shown) is attached to the outer peripheral side surface of the main body 40a by a fixing means such as a bolt. Note that the connection fitting (not shown) has one end fixed to the trim 40 and the other end fixed to the heat sink 1 and supports the reflector 20 on the other end. Thus, the trim 40, the reflecting plate 20, and the heat sink 1 are connected to each other.

Further, on the exit 20a2 side of the reflecting plate 20 opposite to the inclined surface 30b, it extends in the vertical direction from the vicinity of the exit 20a2 to the vicinity of the outer peripheral edge (free end) of the inclined surface 30b of the diffusion plate. The sub-reflecting plate 70 is formed. The sub-reflection plate 70 has an upper end fixed to the trim 40.
According to this configuration, light incident on the region between the exit port 20 c of the reflecting plate 20 and the outer peripheral edge of the inclined surface 30 b of the diffusing plate 30 is reflected by the sub-reflecting plate 70, and The light is introduced to the inclined surface 30b. That is, by providing the sub-reflecting plate 70, more light can be guided to the inclined surface 30b of the diffusing plate 30.

  The cone 60 extends from the vicinity of the outer peripheral end of the diffusion plate 30 toward the inner flange 40c of the trim 40. The cone 60 assists the light emitted from the diffusion plate 30 downward and reduces the light. When the light W is embedded and installed in the ceiling C, the light W is covered so that the inner peripheral surface of the trim 40 and the interior of the ceiling cannot be seen from below.

  As shown in FIG. 2, the downlight W configured as described above is located near the wall surface D (for example, the wall surface D perpendicular to the ceiling) so that the light irradiation direction from the light source unit 10 faces downward. It is inserted into the opening (attachment hole) formed in the ceiling C from below and installed inside the ceiling C. The downlight W inserted into the ceiling C is locked to the ceiling C by the elastic force of an attachment spring 50 (see FIG. 1) attached to the trim 4.

When power is supplied to the downlight W installed in the ceiling C as described above to cause the light source unit 10 to emit light, the light emitted from the light source unit 10 is directly or directly reflected by the reflector 20 or the sub reflector. After being reflected by 70, the light is incident on the diffusion plate 30.
Of the light incident on the diffusing plate 30, the light incident on the orthogonal surface 30 a with respect to the central optical axis of the light source is diffused and transmitted through the orthogonal surface 30 a with respect to the central optical axis of the light source to be above the wall surface D (the wall surface D). Is irradiated from the upper end of the lens to a lower side from a position below a predetermined dimension. Of the light incident on the diffusion plate 30, the light incident on the inclined surface 30 b is refracted and diffused and transmitted through the inclined surface 30 b toward the upper end of the wall surface D, and the upper side of the wall surface D from the upper end of the wall surface D. Irradiation is performed over a position below the predetermined dimension from the upper end of the wall surface D.
That is, in this embodiment, since the diffusing plate 30 has a structure including the orthogonal surface 30a and the inclined surface 30b with respect to the central optical axis of the light source, the upper end portion of the wall surface D can be irradiated with light and the upper end of the wall surface D can be irradiated. A light with a high degree of uniformity can be irradiated to a wide area on the lower side from the section.

  Further, in the present embodiment, a structure that requires complicated processing such as the diffusion plate described in Patent Document 1 described above (an uneven structure is formed on the light incident surface and the light exit surface, and light from the light source is applied to the light exit surface). The first area that diffuses and emits light and the second area that diffuses and emits light from the light source at an angle different from the diffusion angle in the first area are not adopted, and it is relatively simple Since the diffuser plate 30 having a simple structure is used, it can be easily manufactured as compared with that of Patent Document 1.

  In the present embodiment, the diffusion plate 30 is disposed between the reflection plate 20 and the ceiling C surface, and the diffusion plate protrudes from the ceiling C surface as in the downlight of Non-Patent Document 1 described above. Since it is not a structure, the beauty | look of the ceiling C part is not spoiled.

In addition, when the inventor of this application performed the irradiation test with respect to a wall surface (wall surface perpendicular | vertical to a ceiling) using the downlight W of this embodiment and the downlight 100 of the prior art shown in FIG. The wall surface illuminance distribution shown in FIG. 4 was obtained.
Here, FIG. 3 is a wall surface illuminance distribution diagram of the downlight of the present embodiment, and FIG. 4 is a wall surface illuminance distribution diagram of the conventional downlight shown in FIG.

The “downlight W” and the “prior art downlight 100” used in the above-described irradiation test are equipped with a light source unit (LED 30W) having the same configuration. In the above irradiation test, both the “downlight W” and the “prior art downlight 100” are embedded in a ceiling with a distance of “0.9 m” from the wall surface and then installed from the light source unit. Irradiation was performed.
And as a result of the irradiation test using the downlight W of this embodiment, the wall surface illuminance distribution shown in FIG. 3 is obtained, and as a result of the irradiation test using the conventional downlight 100, the wall illuminance distribution shown in FIG. Obtained.

The wall surface illuminance distribution of the downlight W of the present embodiment shown in FIG. 3 indicates that light is irradiated to the upper end portion of the wall surface and light is irradiated to a wide area of the wall surface.
On the other hand, the wall surface illuminance distribution of the conventional downlight 100 shown in FIG. 4 indicates that no light is irradiated on the upper end of the wall surface. 3 and 4, the downlight 100 according to the related art has a narrower irradiation area on the wall surface than the downlight W of the present embodiment (height direction and width direction). In both cases).
As described above, as a result of the above-described irradiation test, it was found that the downlight W of the present embodiment can realize light irradiation to the upper end portion of the wall surface which cannot be achieved by the conventional downlight 100 shown in FIG. In addition, as a result of the above-described irradiation test, the downlight W of the present embodiment can irradiate light over a wider area of the wall surface than the conventional downlight 100 (that is, the entire wall surface can be irradiated uniformly). It has been found that the effect can be obtained.

  As mentioned above, although this embodiment was described, this invention is not limited to this embodiment, A various change is possible within the range of the summary.

  For example, in the above-described embodiment, the light source unit 10 includes the optical substrate (COB) 12 disposed on the optical substrate (COB (Chip On Bord)) insulating plate 11. It is not limited to this. The light source unit 10 may be applied to the present invention even if it uses components other than the optical substrate (COB) 12 as long as it can emit light by power supplied from a power source unit (not shown).

Further, in the above-described embodiment, the diffusing plate 30 is configured as an integral part of the orthogonal surface 30a and the inclined surface 30b with respect to the central optical axis of the light source, but may be configured as a separate part.
Further, the orthogonal surface 30a and the inclined surface 30b with respect to the central optical axis of the light source may be configured as a curved surface including a hyperboloid, a paraboloid, and a free-form surface instead of a flat surface. Furthermore, if the light source unit 10 is structured to face the wall surface while maintaining the structural relationship between the light source unit 10 and the diffusing plate 30, the upper part of the wall surface can be irradiated.

  In the above-described embodiment, the case where the lighting fixture is a downlight has been described as an example. However, the present invention is applicable to lighting fixtures other than the downlight as long as the lighting fixture has the same configuration. .

W ... Downlight (lighting fixture)
DESCRIPTION OF SYMBOLS 1 ... Heat sink 10 ... Light source part 11 ... Optical board insulation board 12 ... Optical board 13 ... Silicon cover 20 ... Reflection board 20a ... Reflection part 20a1 ... Incidence port 20a2 ... Outlet port 20b ... Flange part 20c ... Reinforcement part 30 ... Diffusing plate 30a ... An orthogonal surface 30b with respect to the center optical axis of the light source ... Inclined surface 40 ... Trim 40a ... Main body portion 40b ... Outer flange portion 40c ... Inner flange portion 50 ... Mounting spring 60 ... Cone 70 ... Sub-reflection plate 81 ... Optical substrate holder 83 ... Diffusion Plate mounting bracket

Claims (3)

A lighting fixture that is embedded in the ceiling and emits light toward the wall surface from an opening formed in the ceiling surface,
A light source unit;
A reflecting plate for reflecting light emitted from the light source unit;
A diffusing plate disposed between the reflecting plate and the ceiling surface for diffusing and transmitting the light;
The diffuser plate is orthogonally spaced from the ceiling surface by a predetermined distance and orthogonal to the central optical axis of the light source, and is refracted toward the ceiling surface from one end of the orthogonal surface and directed toward the ceiling surface. And a slanted surface extending from the lighting device.   The lighting apparatus according to claim 1, wherein the light source unit is installed such that a central optical axis of emitted light is positioned on an inclined surface side of the diffusion plate. The reflecting plate has a hollow bowl-shaped reflecting portion in which an incident port that surrounds the light emitted from the light source unit is formed at the upper end and an emission port that emits the incident light is formed at the lower end. Have
On the exit side of the reflector facing the inclined surface, a sub-reflector extending from the vicinity of the exit port to the vicinity of the outer peripheral edge of the inclined surface of the diffusing plate is provided. The lighting fixture according to claim 1 or 2, characterized by the above.

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