The present invention is related to a panel light apparatus and more particularly related to a panel light apparatus with good heat dissipation function.
LED (Light Emitted Diode) is popular today and widely used in various fields to replace traditional light devices. For example, panel light device provides soft light by guiding light from a lighting guide. This makes panel light devices a great tool for providing light to human life while not hurting people eyes or making people not comfortable.
In addition, LED modules may decrease their life spans if being kept working for long time under high working temperature. Therefore, it is beneficial to design panel light and other light device with better heat dissipation features and with longer life span.
According to an embodiment, a panel light apparatus includes an optical guiding unit, a light source, a support base and a stop unit. The light source emits an original light passing through the optical guiding unit via an entrance side of the optical guiding unit. The support base is used for mounting the light source. The stop unit keeps at least a first distance between the entrance side of the optical guiding unit and the light source when the optical guiding unit has a thermal expansion so that the entrance side of the optical guiding unit expands toward the light source.
In some embodiments, the concept mentioned here, e.g. the stop unit and related arrangement, may be used in a light bulb, a light tube, a downlight or some other light devices.
In some embodiments, the optical guiding unit may be a light guiding plate. The light guiding plate may be made of a plastic plate with micro dots formed by applying laser lights.
In some embodiments, the optical guiding unit may include a lens plate, a diffusion plate to change light movement paths. In some other embodiment, the optical guiding unit may be a transparent plate attached with color or fluorescent layers to change light characteristics like colors
In some embodiments, the panel light apparatus may also include a deformable unit pressing the support base to the optical guiding unit.
In some embodiments, the deformable unit has an inner side pressing the support base and has an external side pressing a panel frame of the panel light apparatus.
In some embodiments, the deformable unit has elastic force. When there is no external force applying on the deformable unit, the deformable unit presses the support base to keep the support base fixing at a predetermined position.
In some embodiments, the deformable unit includes a spring.
In some embodiments, the stop unit is fixed on the support base, and when the optical guiding unit expands, the entrance side of the optical guiding unit engages an edge of the stop unit before engaging the light source.
In some embodiments, the stop unit is fixed to the optical guiding unit.
In some embodiments, the support base comprises a light source plate and a heat dissipation structure.
In some embodiments, the stop unit is fixed to the heat dissipation structure.
In some embodiments, the heat dissipation structure has a wall side and a bottom side, the light source plate is placed on the bottom side and pressing the wall side.
In some embodiments, there is a heat dissipation layer between the wall side and the light source plate.
In some embodiments, the stop unit comprises a spring.
In some embodiments, the optical guiding unit is a light guiding plate. The light guiding plate has a lateral side for facing the light source and has a top side attaching to a reflective layer. Light is escaped from the light guiding plate from a bottom side of the light guiding plate.
In some embodiments, the reflective layer has a heat dissipation unit for guiding heat of the optical guiding unit to a heat dissipation structure of the support base.
In some embodiments, the panel light apparatus also includes a diffusion layer heat connected to a panel frame and a heat dissipation structure of the support base.
In some embodiments, the panel light apparatus also includes a groove for the support base to move inside the groove.
In some embodiments, the panel light apparatus also includes a distance sensor. When the first distance between the optical guiding unit and the light source is less than a threshold, a driver controls the light source to lower down an output light of the light source.
In some embodiments, the panel light apparatus also includes a distance sensor. When the first distance between the optical guiding unit and the light source is less than a threshold, a driver controls adjacent LED modules of the light source to turn on and turn off alternatively.
In some embodiments, the light source has a first light source part and a second light source part facing to two sides of the optical guiding unit. A driver turns on and turns off the first light source part and the second light source part alternatively.
In some embodiments, the stop unit has a reflective layer.
The driver mentioned above may include driver circuits for converting an external power source to a direct current supplying to LED modules of the light source.
According to an embodiment, a panel light apparatus includes an optical guiding unit, a light source, a support base and a stop unit.
The light source emits an original light passing through the optical guiding unit via an entrance side of the optical guiding unit. The support base is used for mounting the light source. The stop unit keeps at least a first distance between the entrance side of the optical guiding unit and the light source when the optical guiding unit has a thermal expansion so that the entrance side of the optical guiding unit expands toward the light source.
In some embodiments, the concept mentioned here, e.g. the stop unit and related arrangement, may be used in a light bulb, a light tube, a downlight or some other light devices.
In some embodiments, the optical guiding unit may be a light guiding plate. The light guiding plate may be made of a plastic plate with micro dots formed by applying laser lights.
In some embodiments, the optical guiding unit may include a lens plate, a diffusion plate to change light movement paths. In some other embodiment, the optical guiding unit may be a transparent plate attached with color or fluorescent layers to change light characteristics like colors
In some embodiments, the panel light apparatus may also include a deformable unit pressing the support base to the optical guiding unit.
In some embodiments, the deformable unit has an inner side pressing the support base and has an external side pressing a panel frame of the panel light apparatus.
In
The deformable unit includes a first elastic unit 31 and a second elastic unit 32. The first elastic unit 31 is disposed between an inner side of a panel frame and a back side of the light source 50. The second elastic unit 32 is disposed between a front side of the light source 50 and the light guiding plate 20. The second elastic unit 32 may be regarded as a stop unit mentioned above. In other words, the stop unit may be an elastic or rigid structure. The light source 50 includes a light source plate 51, multiple LED components 52 and at least one stop piece 53. The multiple LED modules 52 are arranged on a front side of the light source plate 51. The stop piece 52, which may be regarded as a stop unit example, is also disposed on the front side of the light source plate 51. The multiple LED modules 52 and the stop piece 53 are disposed at the same side of the light source plate 51. A height of the stop piece 53 is larger than a height of the LED modules 52.
When the light guiding plate 20 is expanded for thermal expansion and engages the second elastic unit 32, the second elastic unit 32 is deformed by the light guiding plate 20, the lateral side of the light guiding plate 20 engages the stop piece 52. The deformation of the first elastic unit 31 is larger than the deformation of the second elastic unit 32.
With such arrangement, the LED modules 52 are not damaged when being pressed by the light guiding plate 20. The first elastic unit 31 and the second elastic unit 32 are both pressed. However, by controlling the elastic deformation, the first elastic unit 31 is easier to be deformed than the second elastic unit 32. With such design, the distance variation between he light guiding plate 20 and the LED modules 52 is reduced compared with just using one elastic unit as the deformable unit as mentioned above.
Such design improves overall optical efficiency. The protection of the LED modules 52 is achieved even when the light guiding plate 20 is not reduced for its dimension.
In the illustrated example, the housing 10 has a flat box shape. The cross-sectional view of the housing 10 has a rectangular shape. The bottom of the housing 10 has an opening and a top of the housing is closed. The housing 10 may be made of aluminum material or other metal material. The light guiding plate 20 may be made of polyester material. The thickness of the light guiding plate 20 is larger than the thickness of the LED modules 52 so that light emitted from the LED modules 52 enters the light guiding plate 20.
In
In some embodiments, as shown in
In some embodiments, the stop piece 53 may be a stop unit formed as an unibody piece with the light source plate 51. There may be multiple stop units on the light source plate 51. For example, there are two stop columns on two sides of the LED modules 52 on the light source plate 51.
In some other embodiments, the first elastic unit 31 and the second elastic unit 32 are made of sponge or polyurethane material. The thickness of the first elastic unit 31 and the second elastic unit 32 may be adjusted by using different layers of deformable materials.
In some other example, the first elastic unit 31 and the second elastic unit 32 may also be spring components, as shown in
In
In some embodiments, as shown in
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The diffusion layer 60 has its four peripheral edges pressing the support plate 120 thus the diffusion plate 60, the light guiding plate 20 and the reflective layer 70 are confined in the housing 10. The heat dissipation structure 40 is placed on the support plate 120.
In some embodiment, as shown in
In some embodiments, as shown in
In addition to the above-described embodiments, any modifications, as long as it is within the spirit of the same invention, the various designs that can be made by a person skilled in the art should fall within the scope of the present invention.
Number | Date | Country | Kind |
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201921625011.3 | Sep 2019 | CN | national |
201921626190.2 | Sep 2019 | CN | national |