CN202868473U - Lighting appliance - Google Patents

Abstract

The utility model provides a lighting appliance, which suppresses the decrease of light output and improves uneven brightness. The lighting fixture includes a light source unit, a reflector, and a decorative frame. The light source unit has a plurality of light emitting elements arranged on the circumference. The reflector is provided on the light source unit and has a plurality of light guides for guiding the light radiated from the light source unit to the outside of the light source unit. The decorative frame covers the reflecting plate. Each of the plurality of light guides has an opening and a reflection surface. The opening is provided on the side of the light source unit. The reflective surface surrounds the opening and reflects light emitted from the light source unit. Among the reflective surfaces, the height of the reflective surface on the inner peripheral side with a short distance from the virtual central axis of the light source unit is lower than the outer periphery of the reflective surface with a long distance from the central axis. side height.

Description

lighting equipment

technical field

The utility model relates to a lighting appliance. the

Background technique

In recent years, lighting sources in lighting fixtures are being replaced from incandescent lamps or fluorescent lamps to energy-saving/long-life light sources such as light-emitting diodes (LEDs). Since LEDs have a smaller light-emitting portion area than fluorescent lamps, for example, when a reflector or the like is provided on the front surface of a light source unit in which a plurality of LEDs are arranged to guide illumination light outward, brightness unevenness may occur. Furthermore, if an optical material is provided on the front surface of the LED to diffuse the illumination light, the light output will decrease. the

Patent Document 1: Japanese Patent Laid-Open No. 2010-3677

Utility model content

An object of the present invention is to provide a lighting fixture that suppresses the decrease in light output and improves brightness unevenness. the

The utility model provides a lighting appliance, which is provided with a light source unit, a reflection plate and a decorative frame. The light source unit has a plurality of light emitting elements arranged on the circumference. The reflecting plate is provided on the light source unit, and has a plurality of light guides for guiding light radiated from the light source unit to a direction opposite to the light source unit, that is, outward. The decorative frame covers the reflecting plate. Each of the plurality of light guides has an opening and a reflection surface. The opening is provided on the side of the light source unit. The reflective surface surrounds the opening and reflects light emitted from the light source unit. Among the reflective surfaces, the height of the reflective surface on the inner peripheral side with a shorter distance from the virtual central axis of the light source unit is lower than that of the reflective surface on the outer peripheral side with a long distance from the central axis. face height. the

In addition, preferably, the reflective surface is provided in an inverted cone shape expanding outward from the side of the light source unit. the

In addition, it is preferable that in the reflection surface, the angle of the inner peripheral side with respect to the central axis is larger than the angle of the outer peripheral side with respect to the central axis. the

In addition, it is preferable that the reflective surface specularly reflects light emitted from the plurality of light emitting elements. the

In addition, it is preferable that the reflective surface contains metal. the

utility model effect

According to the embodiment of the present invention, it is possible to provide a lighting fixture that suppresses a decrease in light output and improves brightness unevenness. the

Description of drawings

FIG. 1 is a perspective view illustrating an example of a lighting fixture according to a first embodiment. the

Fig. 2 is a three-dimensional sectional view taken along line A-A of Fig. 1 . the

Fig. 3 is a perspective view illustrating an example of a light source unit in a lighting fixture. the

FIG. 4( a ) is a perspective view illustrating an example of a reflector in a lighting fixture. the

Fig. 4(b) is a three-dimensional cross-sectional view along line B-B of Fig. 4(a). the

Fig. 5 is a perspective view illustrating an example of a decorative frame in a lighting fixture. the

In the figure: 1-lighting equipment, 2-light source unit, 3-installation part, 4-light-emitting element, 5-radiating body, 6-reflector, 7-light guide part, 8-connection part, 9-bottom plate part, 10 - opening, 11 - reflective surface, 13 - decorative frame, 14 - inner frame, 15 - outer frame. the

Detailed ways

Embodiments will be described in detail below with reference to the drawings. In addition, the drawings are schematic or conceptual diagrams, and the shape of each part, the relationship of vertical and horizontal dimensions, the ratio of sizes between parts, and the like are not necessarily the same as the real ones. Furthermore, even when the same parts are shown, mutual dimensions or ratios may be shown differently depending on the drawings. In addition, in this specification and each drawing, the same reference numerals are assigned to the same elements as described above with respect to the drawings that have already appeared, and detailed description thereof will be appropriately omitted. the

(first embodiment)

FIG. 1 is a perspective view illustrating an example of a lighting fixture according to a first embodiment. the

Fig. 2 is a three-dimensional sectional view taken along line A-A of Fig. 1 . the

The lighting fixture 1 of the present embodiment is a so-called downlight used to be embedded in an opening of a ceiling (not shown). The lighting fixture 1 includes a light source unit 2 , a reflector 6 , and a decorative frame 13 covering the reflector 6 . the

Fig. 3 is a perspective view illustrating an example of a light source unit in a lighting fixture. the

The light source unit 2 is formed in a substantially cylindrical or tubular shape. The light source unit 2 has a mounting portion 3 formed in a substantially disk shape, a plurality of light emitting elements 4 provided on the circumference of the mounting portion 3 , and a radiator 5 provided on the opposite side of the mounting portion 3 . the

The plurality of light emitting elements 4 are provided on the attachment portion 3 in a circumferential shape with respect to the virtual central axis L of the light source unit 2 . In addition, this specific example exemplifies a structure in which a step is provided in the mounting portion 3 on which adjacent light emitting elements 4 are mounted, and a part of the light emitting elements overlap in the central axis L direction. In addition to the structure illustrated in this specific example, for example, the planar shape of the light emitting element 4 may be formed so that the light emitting element 4 does not overlap, and it may be mounted on a flat mounting part. In addition, in this specific example, a configuration in which six light emitting elements 4 are provided is shown as an example, but the number of light emitting elements 4 can be set to an arbitrary number according to the light output. the

The radiator 5 is made of, for example, a material with high thermal conductivity such as metal, and is thermally bonded to the light emitting element 4 to dissipate heat generated in the light emitting element 4 to the outside air. In this specific example, the radiator 5 exemplifies a structure including a plurality of radiator fins. The configuration of the radiator 5 is arbitrary depending on the amount of heat generated by the light emitting element 4 , and it only needs to have a shape embedded in an opening provided on a ceiling (not shown). the

In addition, the radiator 5 and the installation part 3 can be integrally formed, and can also be formed separately from different materials. For example, the radiator 5 can be formed of a material with high thermal conductivity such as metal, and the surface of the radiator 5 can be used as the mounting part 3 , for example, in a disk shape or in a ring shape. In addition, the attachment part 3 formed, for example, in a disk shape or a ring shape made of resin or the like may be provided on the radiator 5 formed of, for example, metal. the

FIG. 4( a ) is a perspective view showing an example of a reflector in a lighting fixture, and FIG. 4( b ) is a perspective cross-sectional view taken along line B-B of FIG. 4( a ). the

The reflector 6 has: a plurality of light guides 7 for guiding the light radiated from the light source unit 2 to the opposite direction of the light source unit 2, that is, outward; a connecting portion 8 provided between adjacent light guides 7; and a bottom plate 9. Set inside the plurality of light guides 7. The reflection plate 6 can be integrally formed of, for example, metal or the like, and can also be formed separately from different materials. the

Each of the plurality of light guides 7 has an opening 10 provided on the light source unit 2 side, and a reflective surface 11 that surrounds the opening 10 and reflects light emitted from the light source unit 2 outward. It has an inverted conical reflective surface 11 expanding outward. The light guide portion 7 is formed of, for example, a material having a high reflectance with respect to light emitted from the light source unit 2 , such as metal, and mirror-reflects incident light from the opening 10 . the

This specific example exemplifies a configuration in which the reflective surface 11 in the light guide portion 7 is formed in an inverted tapered shape expanding outward. And, in this specific example, the height H of the reflective surface 11 from the opening 10 is configured such that the distance D from the central axis L is H1 when the distance D is below the predetermined value D1, and is a constant value H2 when the distance D is above the predetermined value D2. When D is between predetermined values D1 and D2, the height H changes continuously from H1 to H2 according to the distance D. For example, it is a structure in which the reflecting plate 6 is hollowed out from outside with a truncated cone whose bottom surface is the radius D1, the upper surface is the radius D2, and the height is H2-H1. the

In addition to the configuration shown in this specific example, the height H of the reflective surface 11 from the opening 10 in the light guide 7 can be changed according to the distance D from the imaginary central axis L of the light source unit 2 . In addition, the height H on the inner peripheral side where the distance D is relatively short may be lower than the height H on the outer peripheral side where the distance D is relatively long. the

In addition, regarding the angle θ between the central axis L1 of the light guide 7 parallel to the central axis L and the reflective surface 11 of the light guide 7, the reflective surface on the inner side with a shorter distance D from the central axis L is larger than the angle θ relative to the central axis L. The distance D of L is longer than the reflective surface on the outside. For example, as shown in FIG. 4( b ), in terms of the angles between the reflective surface 11 of the light guide 7 and the plane passing through the central axis L and the central axis L1 , the curves 12 a and 12 b intersect with the central axis L1 , the inner curves The angle θ1 between the curve 12a and the central axis L1 is larger than the angle θ2 between the outer curve 12b and the central axis L1. the

Therefore, the light guide 7 reflects incident light from the opening 10 more strongly toward the center axis L on the outer periphery of the reflective surface 11 than on the inner periphery of the reflective surface 11 toward the outer periphery. As a result, the incident light from the opening 10 spreads toward the center axis L and is reflected outwardly, which is the opposite side of the light source unit 2 , so that the emitted light from the light guide 7 can be diffused. the

And, as in this specific example, when the reflective surface 11 in the light guide part 7 is set as an inverted cone-shaped structure that surrounds the opening 10 and expands outward, when compared with a cylindrical reflective surface, the reflective surface 11 can make the The direction of the reflected light is more parallel to the central axis L1. the

The connecting portion 8 is formed of, for example, metal, and connects adjacent light guiding portions 7 , and mirror-reflects the light reflected by the light guiding portion 7 on the opposite side further outward. In this specific example, the connection portion 8 exemplifies a structure connected to the outer peripheral side of the reflection surface 11 in the light guide portion 7 . In this case, for example, the light guide part 7 and the connection part 8 can be integrally formed of metal or the like. Furthermore, in addition to the configuration shown as an example in this specific example, the connecting portion 8 may be provided, for example, on the outer side of the outer peripheral side of the reflection surface 11 . At this time, the reflective surface 11 protrudes from the connecting portion 8 to the inner peripheral side. the

The bottom plate portion 9 is formed of, for example, metal or resin, and functions as a decorative surface that fixes the light guide portion 7 and the connection portion 8 and covers the light source unit 2 from the outside. In addition, in this specific example, the bottom plate portion 9 protrudes outward from the opening portion 10 by a height H1 and is configured to be the same as the height H1 of the inner peripheral side of the reflection surface 11 in the light guide portion 7 . However, the bottom plate portion 9 may be lower than the height H1 of the inner peripheral side of the reflection surface 11, and may also be set to the same height as the opening portion 10. For example, when the bottom plate portion 9 is lower than the height H1 of the inner peripheral side of the reflective surface 11 , the inner peripheral side of the reflective surface 11 protrudes outward from the bottom plate portion 9 . the

Fig. 5 is a perspective view illustrating an example of a decorative frame in a lighting fixture. the

The decorative frame 13 has an inner frame portion 14 formed in a cylindrical shape from, for example, resin, and an outer frame portion 15 protruding from the outer periphery of the inner frame portion 14 radially outward. The inner frame portion 14 covers the reflection plate 6 from the outside. And the outer frame part 15 is in contact with the lower surface of a ceiling, and fixes the lighting fixture 1. As shown in FIG. the

In addition, in the lighting fixture 1 , a translucent cover (not shown) may be provided to cover the reflection plate 6 . For example, a disk-shaped translucent cover can be provided near the boundary between the inner frame portion 14 and the outer frame portion 15 . At this time, the decorative frame 13 and the translucent cover constitute the appearance of the light-trapping surface side of the lighting fixture 1 and function as a frame for protecting the light source unit 2 . the

The translucent cover constitutes the appearance of the light-trapping surface side of the lighting fixture 1 and functions as a frame protecting the light source unit 2 . The translucent cover is formed of, for example, a translucent resin or the like. In addition, the translucent cover is colored, for example, milky white, and is translucent to such an extent that the light source unit 2 cannot be seen with naked eyes from the outside. the

When LEDs are used as the light emitting element 4 , the area of the light emitting part is smaller than that of a fluorescent lamp. Therefore, for example, a light source unit in which a plurality of LEDs are arranged has less diffuseness of illumination light than a fluorescent lamp. As a result, for example, when the height H of the reflective surface 11 of the light guide part 7 in the reflector 6 is set to be constant on the inner peripheral side and the outer peripheral side, the illumination light on the decorative frame will have brightness and darkness of the light emitted from the plurality of LEDs respectively. , The so-called uneven brightness. At this time, by providing a translucent cover with high diffusivity, illumination light can be diffused to reduce brightness unevenness. However, more diffuse domes reduce light output and reduce efficiency. the

On the other hand, in this embodiment, the reflective surface 11 of the light guide part 7 in the reflector 6 is formed so that the height of the inner peripheral side is relatively low and the height of the outer peripheral side is relatively high. As a result, the reflected light of the light radiated from the light emitting element 4 to the inner peripheral side increases, so that the brightness unevenness is reduced. Furthermore, since the light distribution of the light radiated from the light emitting element 4 can be expanded by the reflector 6, a translucent cover with low diffusivity and high transmittance can be used. As a result, reduction in light output can be suppressed and efficiency can be improved. the

And, when the reflective surface 11 in the light guide part 7 is set as an inverted cone-shaped structure that surrounds the opening 10 and expands outward, the direction of the reflected light based on the reflective surface 11 can be made more accurate than that of a cylindrical reflective surface. Close to parallel to the central axis L1. As a result, the output of light guided outward increases, and efficiency can be improved. the

As mentioned above, although embodiment was demonstrated referring the specific example, it is not limited to these, Various deformation|transformation is possible. For example, the light-emitting element 4 as an illumination source can be LED or OLED (Organic light-emitting diode) or EL (Electro-Luminescence), and the light-emitting element 4 can be connected with multiple LEDs in series or in parallel. the

In addition, the planar shape of the light source unit 2 is not limited to a circular shape, and may be a polygonal shape such as a rectangle in addition to an elliptical shape. the

Several embodiments of the present utility model have been described, but these embodiments are only proposed as examples, and are not intended to limit the scope of protection claimed by the utility model. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the gist of the present invention. These embodiments or modifications thereof are included in the scope or gist of the present invention, and are included in the present invention described in the claims and its equivalent scope. the

Claims (5)

1. A lighting fixture wherein, Equipped with: a light source unit with multiple light emitting elements arranged on the circumference; a reflection plate disposed on the light source unit, and has a plurality of light guides for guiding the light radiated from the light source unit to the opposite direction of the light source unit, that is, outward; and a decorative frame covering the reflector, The plurality of light guides respectively have: an opening provided on the side of the light source unit; and a reflective surface that surrounds the opening and reflects light emitted from the light source unit, Among the reflective surfaces, the height of the reflective surface on the inner peripheral side with a shorter distance from the virtual central axis of the light source unit is lower than the height of the reflective surface on the outer peripheral side with a longer distance from the central axis. The height of the reflective surface. 2. The lighting fixture according to claim 1, wherein, The reflective surface is arranged in an inverted cone shape extending outward from the side of the light source unit. 3. The lighting fixture of claim 1, wherein: In the reflective surface, an angle of the inner peripheral side relative to the central axis is larger than an angle of the outer peripheral side relative to the central axis. 4. The lighting fixture according to any one of claims 1 to 3, wherein, The reflective surface specularly reflects light emitted from the plurality of light emitting elements. 5. The lighting fixture according to any one of claims 1 to 3, wherein, The reflective surface includes metal.

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