Patent Application
20160281955
1. Field of the Invention
The present invention relates to a flat panel luminaire, and in particular, to a flat panel luminaire for indoor illumination.
2. Description of Related Art
Common illumination luminaries currently in the market generally have a lampshade and a light emitting device (such as an incandescent bulb, a fluorescent tube, or a light emitting diode) disposed in the lampshade. The light emitting device is disposed at a side of the lampshade and light generated by the light emitting device is reflected by the lampshade and projected into a certain region.
The main function of a lampshade used in a conventional illumination luminaire (for example, an indoor illumination lamp or a street lamp) is to enable light from the light emitting device to be projected at a certain angle to intensively irradiate a certain illumination region and to be diffused evenly, so that the illumination luminaire provides uniform illuminance in the light projection region. Therefore, the lampshade of the conventional illumination luminaire generally includes a reflection plate for reflecting light and a diffusion plate or a light transmitting cover for diffusing light.
The lampshade of the conventional illumination luminaire is generally designed so that light generated by the illumination luminaire can only irradiate in a single direction. However, because the conventional illumination luminaire only has a single light outgoing direction, the light of the luminaire is intensively projected into the projection region and cannot irradiate in the range outside the light projection region, so that the light illumination intensity is uneven inside the light projection region and outside the light projection region, resulting in too strong a contrast. As a result, visual discomfort is caused and vision may be easily damaged. Therefore, in the past, when indoor illumination is arranged, in addition to a primary illumination luminaire, other auxiliary light sources must be arranged for illuminating the space outside an illumination region of the indoor primary luminaire to balance the light illumination intensity inside and outside a light irradiation region of the primary illumination luminaire, avoiding the visual discomfort problem caused by too strong contrast.
Thus, it has become an important issue in the art to be solved, through improvement in structural design, the problem that the conventional illumination luminaire only has a light projection region in a single direction, resulting in uneven indoor illumination intensity and thus too strong contrast.
The main objective of the present invention is to provide a flat panel luminaire having two different light outgoing directions, for solving the problem that a conventional illumination luminaire only has a single light projection region, resulting in uneven light illumination intensity and thus too strong contrast inside and outside a light irradiation region.
A flat panel luminaire according to an embodiment of the present invention comprises: a frame assembly; a first light transmitting plate, disposed at one side of the frame assembly; a second light transmitting plate, disposed at the other side of the frame assembly in parallel to and opposite to the first light transmitting plate; and at least one light emitting device, disposed inside the frame assembly and located between the first light transmitting plate and the second light transmitting plate, wherein the frame assembly is formed of two side frames, two connection plates, and a central support, the two side frames and the two connection plates together enclosing an accommodating space; the first light transmitting plate and the second light transmitting plate are disposed at both sides of the accommodating space, respectively, and have different light transmittances so that an illumination intensity of light generated by the light emitting device and transmitted from the first light transmitting plate is different from an illumination intensity of light generated by the light emitting device and transmitted from the second light transmitting plate.
The beneficial effects of the present invention are that, at one side of the flat panel luminaire, a primary light projection region with high illuminance can be formed and at the other side of the flat panel luminaire, a secondary light projection region with low illuminance can be formed, so that illumination brightness in a region outside an illumination range of the primary light projection region can be balanced with light of the secondary light projection region, avoiding the visual discomfort problem caused by inadequate illumination brightness and strong brightness contrast in a region outside a light projection region due to a single light projection region.
In order to further understand the features and technical content of the present invention, reference is made to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are only intended for reference and illustration, but do not limit the present invention.
Referring to
As shown in
In the structure of the flat panel luminaire 1 of the present invention, the frame assembly 10 has a rectangular frame. The frame assembly 10 is formed of a plurality of frames and connection plates (described later). An accommodating space 15 is formed at an inner side of the frame assembly 10. The first light transmitting plate 21 and the second light transmitting plate 22 are disposed at two sides of the accommodating space 15. The light emitting device 30 includes a plurality of first light emitting strips 31 and a plurality of second light emitting strips 32. The first light emitting strips 31 and the second light emitting strips 32 are disposed in the accommodating space 15 of the frame assembly 10 and located between the first light transmitting plate 21 and the second light transmitting plate 22. After being reflected and diffused by the first light transmitting plate 21 and the second light transmitting plate 22, light generated by the light emitting device 30 is transmitted through the first light transmitting plate 21 and the second light transmitting plate 22 respectively, so that illumination light is projected from two sides of the flat panel luminaire of the present invention. The direction of light generated by the light emitting device 30 and transmitted from the first light transmitting plate 21 is defined as a first light outgoing direction A, and the direction of light generated by the light emitting device 30 and transmitted from the second light transmitting plate 22 is defined as a second light outgoing direction B.
The first light transmitting plate 21 and the second light transmitting plate 22 of the present invention are characterized in that, the first light transmitting plate 21 and the second light transmitting plate 22 are semi-reflecting light-transmitting plates having a light diffusion function and the first light transmitting plate 21 and the second light transmitting plate 22 have different light transmittances, so that light transmitted by the flat panel luminaire 1 of the present invention has different illumination intensities in the first light outgoing direction A and the second light outgoing direction B. In the embodiment shown in
In order to achieve the above-mentioned function, the following specific technical means are used for the first light transmitting plate 21 and the second light transmitting plate 22 of the present invention. First, a light transmitting material having a light diffusion function, for example, a fog-like acrylic plate or frosted glass plate, may be selected for the first light transmitting plate 21 and the second light transmitting plate 22. Furthermore, a semi-reflecting material may be disposed on opposite inner sides of the first light transmitting plate 21 and the second light transmitting plate 22 by means of polishing, evaporation, coating, or attaching, so that opposite inner sides of the first light transmitting plate 21 and the second light transmitting plate 22 have partial light reflection capability, and thus when light of the light emitting device 30 is projected onto the inner surfaces of the first light transmitting plate 21 and the second light transmitting plate 22, a part of the light is transmitted through the first light transmitting plate 21 and the second light transmitting plate 22 and a part of the light is reflected by the inner surfaces of the first light transmitting plate 21 and the second light transmitting plate 22. Therefore, as shown in
Different light transmittances of the first light transmitting plate 21 and the second light transmitting plate 22 of the present invention can be achieved by the following method. Firstly, materials with different light transmission coefficients may be selected for the first light transmitting plate 21 and the second light transmitting plate 22. Secondly, dyes or dopants affecting light transmittance may be added so that the first light transmitting plate 21 and the second light transmitting plate 22 have different light transmittances. Thirdly, as shown in
Through the foregoing technical means, the first light transmitting plate 21 and the second light transmitting plate 22 are formed as semi-transmitting plates with different light transmittances, and thus light projected from the flat panel luminaire 1 in the first light outgoing direction A and the second light outgoing direction B has different illumination intensities. For the embodiment shown in
Thus, as shown in
The frame assembly 10 of the flat panel luminaire 1 of the present invention has: two side frames 11, two connection plates 12, a central support 14, and two end covers 13. The two side frames 11 are disposed in parallel to each other at two sides of the frame assembly 10. The two side frames 11 are long rods made by aluminum extrusion, where each of two ends of the side frames 11 has a connection end 111. The sectional shape of the two side frames 11 is as follows: outer sides are arc-shaped and opposite inner sides of the two side frames 11 are planar.
The two connection plates 12 are metal plates. The two connection plates 12 are perpendicular to the two side frames 11 and are connected to the connection ends 111 at two ends of the two side frames 11 through screw fastening. The two connection plates 12 and the two side frames 11 jointly form a body structure of the frame assembly 10 and an accommodating space 15 is enclosed at inner sides of the two side frames 11 and the connection plates 12.
The central support 14 is further disposed between the two side frames 11, as shown in
In this embodiment of the present invention, each of the two side frames 11 are provided with two first engaging grooves 112 at an upper edge and a lower edge of the inner side thereof, and each of the two side plates 142 of the central support 14 are provided with a plurality of second engaging grooves 143 corresponding in position to the first engaging grooves 112 at an upper edge and a lower edge thereof. Two side edges of the first light transmitting plate 21 and two side edges of the second light transmitting plate 22 are respectively engaged between the first engaging grooves 112 and the second engaging grooves 143, so that the first light transmitting plate 21 and the second light transmitting plate 22 are engaged with the two side frames 11 and the central support 14.
The two end covers 13 of the frame assembly 10 are perpendicular to the two side frames 11 and are located outside the two connection plates 12. Each of the two end covers 13 is provided with two flange portions 131 at two ends thereof, which are engaged with the connection ends 111 of the two side frames 11. The two flange portions 131 can be inserted into the connection ends 111 at the two ends of the two side frames 11 so that the two ends of the two end covers 13 are combined with the connection ends 111 of the two side frames 11. The function of the two end covers 13 is, on one hand, to make the flat panel luminaire 1 at the two ends of the two side frames 11 in a closed state, and on the other hand, to form a part of the structure of the frame assembly 10 to increase the overall strength.
The light emitting device 30 of the flat panel luminaire 1 includes two first light emitting strips 31 and two second light emitting strips 32. The two first light emitting strips 31 are disposed on surfaces of the two side plates of the central support 14. The second light emitting strips 32 are disposed on opposite inner sides of the two side frames 11. In this embodiment, each of the first light emitting strips 31 and the second light emitting strips 32 of the light emitting device 30 is formed of an elongated circuit substrate and a plurality of light emitting diodes disposed on the circuit substrate. Of course, another type of light emitting element, for example, a fluorescent tube or a cold-cathode tube may also be used for the light emitting device 30.
The flat panel luminaire 1 in the first embodiment of the present invention is an indoor illumination lamp placed on the ground. However, the flat panel luminaire 1 of the present invention may also be used in other applications, which are further described below.
As shown in
To sum up, the beneficial effects of the present invention are that, at one side of the flat panel luminaire 1, a primary light projection region with high illuminance can be formed and at the other side of the flat panel luminaire 1, a secondary light projection region with low illuminance can be formed. Therefore, illumination brightness in a region outside an illumination range of the primary light projection region can be balanced with light of the secondary light projection region, avoiding the visual discomfort problem caused by inadequate illumination brightness and strong brightness contrast in a region outside a light projection region due to a single light projection region.
The description above is only preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. All equivalent technical changes made according to the specification and drawings of the present invention should fall within the scope of the present invention.
