A lighting apparatus
The ground-level positioning of the light source in the lighting apparatus addresses safety and efficiency issues in road light maintenance by enabling maintenance from a lower position, reducing complexity and duration, and enhancing accessibility.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- I-SMART TECHNOLOGY INTERNATIONAL LTD
- Filing Date
- 2025-11-12
- Publication Date
- 2026-05-21
AI Technical Summary
Existing road light designs require maintenance personnel to perform tasks at elevated heights, leading to safety risks, increased complexity, and prolonged maintenance durations due to the need for elevating platform trucks, escort vehicles, and time-consuming safety checks.
A lighting apparatus with a light source positioned at ground level and a light transfer media that directs light to an elevated position, utilizing a reflective tunnel-like pathway and a reflector to ensure illumination, allowing maintenance from a lower position and eliminating the need for high-altitude operations.
Reduces maintenance duration, enhances safety by eliminating high-altitude work, improves accessibility, minimizes glare, and eliminates temporary road closures, thereby increasing efficiency and reducing disruptions.
Smart Images

Figure CN2025134469_21052026_PF_FP_ABST
Abstract
Description
A LIGHTING APPARATUSTECHNICAL FIELD
[0001] The invention relates to a lighting apparatus, although not exclusively, to a lighting apparatus with a high maintenance accessibility by workers.BACKGROUND
[0002] Current road light design usually consists of a vertical pole or mast that is securely anchored to the ground. The pole is typically made of durable materials such as steel, aluminum, or composite materials. Usually a luminaire head, such as a bulb or LED module. The luminaire head is designed to provide protection for the light source and to direct the light output in a desired direction, such as illuminating the road surface.
[0003] The luminaire head may incorporate various components, including a reflector or lens to control the light distribution and spread. Additionally, there may be a transparent or translucent cover to protect the light source from environmental factors like rain, dust, or vandalism.SUMMARY OF THE INVENTION
[0004] In accordance with a first aspect of the present invention, there is provided a lighting apparatus, comprising:
[0005] -a light source arranged to emit a light beam; and
[0006] -a light transfer media arranged to receive the emitted light beam from the light source at a first end and to transfer the received light beam to a second end to provide illumination from the second end;
[0007] -wherein the light source is accessible by a user from a lower position and the second end of the light transfer media is arranged to provide the illumination from an elevated position relative to the light source.
[0008] In accordance with the first aspect, the light transfer media comprises an internal pathway with a light reflective surface through which the light beam is reflected from the first end to the second end.
[0009] In accordance with the first aspect, the light transfer media comprises a solar tube with a light reflective interior surface forming an enclosed tunnel-like pathway through which the light beam is directed upwards to the second end.
[0010] In accordance with the first aspect, the solar tube further comprises an intermediate PVC layer arranged to cover the light reflective interior surface and an external metal shell arranged to cover the PVC layer. In accordance with the first aspect, further comprising a reflector arranged to receive the light beam from the second end and to deflect the received light beam towards the lower position.
[0011] In accordance with the first aspect, the reflector further includes a light reflecting unit with a reflective interior surface and a light directive unit, the light reflecting unit arranged to reflect the light onto the light directive unit through the reflective interior surface and the light directive unit is arranged to redirect and evenly distribute the reflected light towards the lower position.
[0012] In accordance with the first aspect, the light directive unit further comprises a translucent cover for evenly distributing the light onto the lower position.
[0013] In accordance with the first aspect, at least a portion of the light transfer media is embedded within a wall.
[0014] In accordance with the first aspect, at least a portion of the light transfer media is position at a false ceiling.
[0015] In accordance with the first aspect, the light source is portable and removably installed into the first end of the light transfer media.
[0016] In accordance with the first aspect, the light source is a laser source arranged to emit a laser beam.
[0017] In accordance with the first aspect, the laser beam is further converted to the illumination at the second end or by the reflector.
[0018] In accordance with the first aspect, the lighting apparatus further comprises a laser converting unit arranged to convert the laser beam to the illumination to be provided towards the lower position.
[0019] In accordance with the first aspect, the reflector comprises the laser converting unit arranged to convert the laser beam before reflecting light converted from the laser beam to provide illumination towards the lower position.
[0020] In accordance with the first aspect, the laser converting unit is arranged to reflect the converted light onto the light directive unit.BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings in which:
[0022] Figure 1a shows a block diagram of a road light in accordance with a first embodiment of the present invention;
[0023] Figure 1b shows a block diagram of the road light as shown in Figure 1a in further details;
[0024] Figure 2 shows a perspective view of a road light in accordance with a second embodiment of the present invention;
[0025] Figure 3 shows a perspective view of a light transfer media of the road light as shown in Figure 2;
[0026] Figure 4 shows a perspective view of a reflector of the road light as shown in Figure 2;
[0027] Figure 5 shows an in-house application of an indoor light in accordance with a third embodiment of the present invention;
[0028] Figure 6 shows a close-up view of the light emitting device of the indoor light as shown in Figure 5;
[0029] Figure 7 shows a close-up view of the light transfer media and the reflector of the indoor light as shown in Figure 5;
[0030] Figure 8 shows a decoration application of a light post in accordance with a fourth embodiment of the present invention;
[0031] Figure 9 shows a close-up view of the light emitting device of the light post as shown in Figure 8;
[0032] Figure 10 shows a block diagram of a road light with an example adjustable reflector device;
[0033] Figure 11 shows a close-up view of the example adjustable reflector device of Figure 10; and,
[0034] Figure 12 is a close-up view of a laser source in accordance with an embodiment of the present invention.
[0035] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0036] Without wishing to be bound by theory, the inventors have discovered that existing design of light poles requires workers to perform maintenance tasks at elevated heights, such as replacing light bulbs, cleaning lighting fixtures, and adjusting bulb positions. This practice has been associated with numerous accidents resulting in severe injuries or fatalities, as workers often utilize ladders to access work areas above ground. Such work at heights poses significant safety risks.
[0037] Performing maintenance activities at elevated heights necessitates the use of elevating platform trucks, which not only require specialized equipment but also entail additional time for safety checks, platform elevation, and descent to facilitate the maintenance process. Moreover, for road lighting, a trained traffic control person, escort vehicle, and driver are typically required during maintenance operations.
[0038] The existing road light post design entails several significant disadvantages that warrant attention.
[0039] Firstly, the reliance on elevating platform trucks poses challenges in terms of maintenance accessibility. These challenges include the need for elevating platform trucks, an escort vehicle, time-consuming safety checks, and delays caused by platform elevation and descent. The need for workers to ascend to elevated heights using these platforms limits their ability to reach the light source efficiently and easily for necessary tasks.
[0040] Secondly, the requirement for an escort vehicle during maintenance operations adds complexity and cost to the process. Coordinating the presence of a trained traffic control person, escort vehicle, and driver consumes valuable time and resources, leading to potential delays in completing maintenance tasks.
[0041] Moreover, the existing design necessitates time-consuming safety checks before commencing maintenance work at heights. These checks encompass inspecting and ensuring the stability of the elevating platform truck, verifying adherence to safety protocols, and assessing the work environment for any potential hazards. These precautions contribute to additional delays in the overall maintenance process.
[0042] Furthermore, the process of platform elevation itself introduces delays. Adjusting the platform to reach the required height for maintenance tasks can be time-consuming, resulting in extended periods before actual work can begin.
[0043] Similarly, after completing the maintenance work, the platform truck needs to be safely descended to the ground level. The time taken for the platform to descend adds to the overall maintenance duration, potentially causing further road closures or disruptions.
[0044] In existing design, the electric cable is typically routed through the steel pole structure, making it challenging to access and address cable issues when they occur. Maintenance personnel often face difficulties in reaching the cable, as it requires navigating the height of the pole using elevating platform trucks or ladders. This not only increases the complexity of the maintenance process but also poses safety risks for workers. The limited accessibility and added complexities associated with electric cable failures in the existing design highlight the need for a more streamlined and accessible maintenance approach to address such issues more effectively.
[0045] The inventor has created a new mechanism that prioritizes safety by addressing one or more aforementioned challenges.
[0046] With reference to Figure 1a, there is shown an embodiment of a lighting apparatus 100, comprising: a light source 101 arranged to emit a light beam; and a light transfer media 102 arranged to receive the emitted light beam from the light source 101 at a first end 102a and to transfer the received light beam to a second end 102b to provide illumination from the second end 102b; wherein the light source 101 is accessible by a user from a lower position and the second end 102b of the light transfer media 102 is arranged to provide the illumination from an elevated position relative to the light source 101.
[0047] For the purposes of this document, the term “light source” includes any type of light emitting device, such as, but not limited to, light bulbs, light emitting diodes, incandescent light bulbs.
[0048] In one example embodiment, there is disclosed is a novel street light post design that features a ground-level installation of the light source, departing from the conventional practice of positioning the luminaire head at a high level. This ground-level light bulb installation eliminates the need for high-altitude operations, reduces maintenance duration for the light post, enhances accessibility for maintenance personnel, and eliminates the need for temporary road closures.
[0049] The present invention also provides several benefits, including reduced maintenance duration, elimination of operations at heights, improved accessibility for maintenance tasks, reduced glare, and the elimination of temporary road closures or diversions. Overall, the present invention focuses on enhancing safety and efficiency in streetlight maintenance.
[0050] As shown in Figure 1a, there is shown a schematic diagram of a road light 100 in accordance with one example embodiment of the present invention. The road light 100 comprises a light source 101, a light transfer media 102 and a reflector 103.
[0051] Preferably, the material used for the light transfer media 102 exhibits a high light reflective property, effectively trapping the light and preventing any leakage. The light transfer media 102 is incorporated in the form of a solar tube, which includes a near end 102a and a further end 102b. The emitted light from the light emitting device 101 is directed into a light transfer media 102 that possesses a high internal reflective property. This light transfer media 102 efficiently captures and guides the light, creating a desirable pathway towards the reflector 103 positioned at the further end 102b of the light transfer media 102 pathway.
[0052] In another example embodiment, the light post may comprise a bulb serving as the light source 101, a hollow pole 102, and a lampshade 103 with a highly reflective material on its interior surface. By directing the light emitted by the bulb 101 into the hollowed pole 102, the interior reflective surface of the pole 102 effectively traps the light, preventing any leakage. The light then travels within the hollowed pole 102 and ultimately reaches the lampshade 103 located at the pole's end 102b. The lampshade 103 employs its interior reflective surface to redirect the light onto the road surface.
[0053] The detailed construction of the reflector 103 will now be further described with reference to Figure 1b.
[0054] Preferably, the reflector 103 may be a subassembly which includes an upper light reflecting unit 104 and a lower light directing unit 105. The upper light reflecting unit 104 receives the incoming light from the light transfer media 102, and the interaction between the upper light reflecting unit 104 and the lower light directing unit 105 will reflect the light to the atmosphere through internal reflections. Within the reflector 103, the light reflecting unit 104 may reflect the light onto the light directing unit 105. The light directing unit 105 then redirects and evenly distributes the reflected light onto the road surface, ensuring uniform illumination.
[0055] Preferably, the light directive unit 105 may be a diverging lens for deflecting the light rays so that the light rays leaving the light directive unit 105 are further spread apart for directing the light ray to a more widespread area.
[0056] Alternatively, the light directive device 105 may also be a converging lens for deflecting the light rays so that the light rays leaving the light directive unit 105 are coming closer together to a point for directing the light ray to a more concentrated area.
[0057] While the reflector 103 in this example embodiment includes a pair of upper light reflecting unit 104 and lower light directing unit 105, it may also include multiple number and different combinations of upper light reflecting unit 104 and lower light directing unit 105 for directing the light ray to a plurality of areas.
[0058] With reference to Figure 2, there is shown a road light 200 in accordance with another example embodiment of the present invention. The layout, elevation and further details of the road light 200 will now be described.
[0059] In one example embodiment as shown in Figure 2, the design of the road light 200 may incorporate a combination of components: a light emitting device 201, a solar tube 202, and a reflector 203. The solar tube 202 may be a specially constructed pole which is made of highly reflective materials. The light emitting device 201, which serves as the primary light source, is positioned underneath a lower end 202a of the solar tube 202 while the reflector 203 is positioned above an upper end 202b of the solar tube 202. This placement ensures that the emitted light is directed upwards all the way from the lowermost light emitting device 201 to the uppermost reflector 203 whereby the light is then emitted from the uppermost position to the lower ground level.
[0060] The detailed construction of the solar tube 202 will now be described with reference to Figure 3.
[0061] In one example embodiment as shown in Figure 3, a solar tube 302 is designed with an interior surface 304 made of a highly reflective enabling the light to travel along the tube 302 in an enclosed tunnel-like pathway. The solar tube 302 may be a hollow tube which permits the passage of light from the lower end 302a to the upper end 302b without any obstructing obstacles. The lower end 302a may be of dome shape 310 so as to focus, collect and collimate the light entering from the light emitting device 201 and provide the function of a plano-convex lens. On the upper end 302b of the solar tube 302, there is also provided a coupling means (not shown) for the mounting of the reflector 203.
[0062] Preferably, the plano-convex lens 310 may provide a spherical surface 312 on a lower side facing the light emitting device 201 and a flat surface 314 on the opposite side of the light emitting device 201 and further away from the light emitting device 201. The thickness at the edge of the lens 310 is generally less than the thickness at the center. The parallel rays of light incident on the convex surface 312 and subsequently intersect at a focus point located somewhere at the lower end 302a. The rays of light would be converged towards the center axis and travel further beyond the center axis and subsequently reflected by the interior surface 304 in an upward direction to reach the reflector 203.
[0063] The detailed construction of the reflector 203 will now be described with reference to Figure 4.
[0064] In one example embodiment as shown in Figure 4, a reflector 403 is connected to the upper end 302b of the solar tube 302. The reflector 403 is also provided with an interior surface 404 which is constructed by a highly reflective material.
[0065] In particular, the reflector 403 here may be provided as a housing which is enclosed by a plurality of reflector walls 403a-403d and the upper portions of the reflector walls 403a-403d are joined together by an upper lid portion 403e which is also made of a highly reflective material.
[0066] The lower portions of the reflector walls 403a-403d are joined together by a translucent cover 405 through which the lights are reflected by the reflector walls 403a-403d as well as the upper lid portion 403e and are directed away from the reflector 403. Preferably, the translucent cover 405 may be positioned at an orientation perpendicular to the reflector walls 403a-403d whereby the exiting light would intersect the translucent cover 405. Accordingly, the translucent cover 405 may serve as the final distribution point for the light. Its purpose is to evenly distribute the light onto the road surface, ensuring uniform illumination across the area. This design approach minimizes uneven lighting and shadows, creating a well-lit and safe environment for road users.
[0067] By skillfully adjusting the cutting angle of the interior surface 404 of the reflector 403, the light that enters it can be efficiently reflected downward onto the translucent cover 405. For instance, the translucent cover 405 may be further connected to the lower portions of the reflector walls 403a-403d through a connecting portion 410. Preferably, the connecting portion 410 may also include a plurality of peripheral walls 410a-410d each connecting to the respective upper reflector walls 403a-403d and the translucent cover 405 underneath.
[0068] To converge the light distributed onto the road surface, the translucent cover 405 may have a surface area smaller than the cross-sectional area of the reflector 403 cutting along the length or width of the reflector 403. To achieve this, one or more of the peripheral walls 410a-410d may bend inwardly so as to connect a larger base area to the underneath translucent cover 405 with a smaller surface area. For instance, the peripheral wall 410d may bend inwardly at an acute angle with respect to a vertical axis parallel to the height of the reflector 403. While other peripheral walls 410a to 410c are vertically extended downwardly underneath the reflector walls 403a-403c respectively in Figure 4, one or more peripheral walls 410a-410c may also bend inwardly at an acute angle with respect to a vertical axis parallel to the height of the reflector 403.
[0069] Alternatively, to diverge the light distributed onto the road surface, the translucent cover 405 may have a surface area larger than the cross-sectional area of the reflector 403 cutting along the length or width of the reflector 403. For instance, one or more peripheral walls 410a-410d may bend outwardly at an acute angle with respect to a vertical axis parallel to the height of the reflector 403. Each of the peripheral walls 410a-410d may also bend at a different acute angle and different combination of bending i.e., some of which may bend inwardly while some of which may bend outwardly.
[0070] With reference to Figure 5, there is shown an indoor light 500 in accordance with one example embodiment of the present invention. The indoor light 500 is an in-house application of the present invention.
[0071] In one example embodiment as shown in Figure 5, the design of the indoor light 500 may also incorporate a light emitting device 502, a light transfer media 503 and a reflector 504. The indoor light 500 is deployed within an indoor environment 510 which is defined by the ground 520, one or more vertical walls 530, 532 made of concrete and a false ceiling 540.
[0072] In this design, the light emitting device 502 is portable and may be installed inside the concrete wall 530 at a position where it is easily reachable by the maintenance personnel. The light transfer media 503 can be installed not only inside the concrete wall 530, but also the false ceiling 540. For instance, a first portion 503a of the light transfer media 503 may be extended along and embedded within the concrete wall 530, and upon reaching the top of the concrete wall 530, a second portion 503b of the light transfer media 503 may further extend in a direction perpendicular to the first portion 503a and parallel to the ground 520. Accordingly, the light transfer media 503 may further span across the false ceiling 540 and reach the reflector 504.
[0073] In use, the light 501 transfers through light transfer media 503 and finally reach the reflector 504 at the end point of the light transfer media 503. The reflector 504 help focusing and evenly distributing the incoming light from light transfer media 503 onto the ground 520.
[0074] Alternatively, the reflector 504 may also be installed on the ceiling 540, on the wall 530, 532 or even on the ground 520, depending on the route of the light transfer media 503.
[0075] The detailed construction of the light emitting device 502 at the lower position and the interaction between the light emitting device 502 and the first portion 503a of the light transfer media 503 will now be described with reference to Figure 6.
[0076] In one example embodiment as shown in Figure 6, there is provided a light box 610 for accommodating a light emitting device 602 while the light emitting from the upper end of the light box 610 may be transmitted to an upper light transfer media 603.
[0077] Preferably, the light box 610 may be enclosed by a plurality of walls 610a-610c and may be plugged into a concrete wall (not shown) . The light box 610 may either be topless or include an upper lid portion 612 which is made of a transparent material. The light box 610 may also be enclosed by a pivotable cover 614. Optionally, the light box 610 may also be provided a lock (not shown) such that only the maintenance personnel may access to the light box 610 and inspect or replace the light emitting device 602. The light transfer media 603 may also be embedded inside the wall (not shown) and coated with material with high reflective index for the internal surface to trap the light.
[0078] A light control hub 620 may also be provided adjacent to the light box 610 for controlling the operation of the light emitting device 602. For instance, the light switch hub 620 may include a first light switch 622 for controlling the ON and OFF of the light emitting device 602 and a second light switch 624 for controlling the dimming and brightening of the light emitting device 602.
[0079] The detailed construction of the light transfer media 503 at the elevated position and the interaction between the second portion 503b of the light transfer media 503 and the reflector 504 will now be described with reference to Figure 7.
[0080] In one example embodiment as shown in Figure 7, there is provided a light transfer media 703 spanning across a false ceiling 730 and a reflector 704 which is embodied in the form of a conventional pendent light.
[0081] In particular, the pendent light 704 may include a further light transfer media 706 in the shape of a light bulb and receive the light from the light transfer media 703. To deflect the light emitting from the light transfer media 706, there is also provided a lampshade 708 for both decorative purpose of covering around the light transfer media 706 as well as reducing the brightness and control the lighting direction of the light transfer media 706.
[0082] With reference to Figure 8, there is shown a light post 800 in accordance with one example embodiment of the present invention. The light post 800 is a decoration application of the present invention.
[0083] In one example embodiment as shown in Figure 8, the design of the light post 800 may also incorporate a light emitting device 801, a light transfer media 802 and a reflector 803. In this design, the light emitting device 801 is portable and installed inside the light post 800 at the position where it is easily reachable by the maintenance personnel.
[0084] The light transfer media 802 is incorporated in the form of the main post body which includes a near end 802a and a further end 802b. The main post body 802 may include a slot 810 for receiving the light emitting device 801 at the near end 802a and a pivotable cover 814 for enclosing the light emitting device 801 within the slot 810.
[0085] Preferably, the interior surface of light transfer media 802 is made by the material with high reflective index for the internal surface to trap the light. The light transfer media 802 may be composed of three layers of material which are material with high reflective index (e.g., solar tube, etc. ) , PVC and external metal shell (from inside to outside) .
[0086] The reflector 803 help focusing and evenly distributing the incoming light from light transfer media 802 onto the ground. The reflector 803 may be extended from the further end 802b of the light transfer media 802 and preferably at an angle with respect to the longitudinal axis of the light transfer media 802 so as to divert the light to a desirable lighting area. For instance, the reflector 803 may be extended from the light transfer media 802 through a linkage 820 which is extended outwardly at an acute angle from the longitudinal axis of the light transfer media 802.
[0087] In use, the light transfers through light transfer media 802 and finally reach the reflector 803 at the end point of the light transfer media 802. The reflector 803 may reflect the light and evenly distribute the light onto the ground.
[0088] Finally, the detailed construction of the light emitting device 801 will now be described with reference to Figure 9.
[0089] In one example embodiment as shown in Figure 9, there is provided a light emitting device 901 and the shape of the light emitting device 901 is designed to fit the shape of light post 800. For instance, the light emitting device 901 may be preferably of a cylindrical shape so as to fit the cylindrical slot 810 defined by the main post body 802.
[0090] The light emitting device 901 includes an upper lid portion 910 which is made of a transparent material through which the light may be emitted to the light transfer media 802. The light emitting device 901 is also equipped with a handle 920 for easy installation and replacement.
[0091] In one example embodiment of the invention as shown in Figure 10, there is provided a light post 1000 which includes a projector device 1001 arranged emit light, wherein the projector device 1001 is further arranged to couple or fit with a light transfer media 1002 to transfer light from the projector device 1001 to a reflector 1003 deposed at the opposite end of the light transfer media 1002. Preferably, the reflector 1003 is arranged to assist with focusing and evenly distributing the incoming light from light transfer media 1002 onto the ground or other surfaces. In some examples, the projector device 1001 may also have a lens to adjust the focus of the light emitted from the projector device 1001.
[0092] As shown in Figure 11, an example of the reflector 1003 of Figure 10 is shown in more detail. As shown, the reflector 1003, which in this instance is a reflector device 1101 is arranged to reflect the light from the transfer media 2002 to a specific direction. The reflector 1101 includes an exterior shield 1102 arranged to protect the reflector 1101 from physical force or from external weather elements, and a light reflector 1103, which may be formed from a mirror or lens, with the reflective angle of the reflector device 1103 being adjustable to cater for different angle of reflection or to adjust the focus of the light, and thus deliver and focus the light to an appropriate surface.
[0093] In a further example embodiment of the invention, the light source can be a laser source, which provides benefits of high directionality and efficiency for transfer over a distance. This embodiment utilizes a converter at the illumination point to transform the laser into safe, visible light for general illumination.
[0094] With reference to Figure 12, there is shown an example of a portable and removably installed laser source 1201 arranged to emit a laser beam, which may be used as the light source, similar to previously described embodiments.
[0095] The shape of the laser emitting device 1201 is designed to fit the shape of the light post, for instance, a cylindrical shape to fit a cylindrical slot 810 at the base of the post. Preferably, the laser emitting device 1201 may include an upper lid portion 1210 which is made of a transparent material through which the laser beam may be emitted to the light transfer media. The laser emitting device 1201 may also be equipped with a handle 1220 for easy installation and replacement.
[0096] In a street lamp application using this embodiment, the laser source 1201 is installed at a lower, accessible position. The emitted laser beam is directed into a laser transfer media, such as the hollow pole 102, which possesses a high internal reflective property. This laser transfer media efficiently captures and guides the laser beam, creating a desirable pathway towards a reflector 103’ , which also function as a light convertor, positioned at the elevated second end 102b.
[0097] Preferably, the laser beam is further converted to the illumination at the second end or by the reflector. More preferably, the street lamp may further comprise a laser converting unit arranged to convert the laser beam to the illumination to be provided towards the lower position.
[0098] The converter and reflector is arranged to receive the incoming laser beam from the second end of the transfer media. Preferably, the converter and reflector may be an assembly including a laser converting unit and a light directive unit, for converting the laser beam before directing the light converted from the laser beam to provide illumination towards the lower position.
[0099] In this example, Tthe laser converting unit is arranged to first convert the received laser beam into a visible light beam suitable for illumination. The converted light is then reflected onto the light directive unit, which is arranged to redirect and evenly distribute the reflected light towards the lower position, such as a road surface, ensuring uniform illumination. This design retains all the maintenance and safety advantages of a ground-level source while leveraging the unique properties of a laser for efficient light transfer.
[0100] To achieve this conversion from a laser beam to a broad-spectrum white light, the laser converting unit may employs a process known as phosphor conversion. For example, the laser source may be a high-power blue laser diode operating in the 445–460 nm wavelength range. This blue laser beam may be directed from the transfer media onto the laser converting unit, which may comprise a light conversion material such as phosphor, e.g. cerium-doped yttrium aluminum garnet (Ce: YAG) , which may be embedded in the reflector or as a layer of material deposited on a surface of the reflector unit.
[0101] This phosphor material may be specifically chosen for its property of absorbing a portion of the high-energy blue laser light and re-emitting it as a broad spectrum of longer-wavelength light, primarily in the yellow region. The portion of the blue laser light that passes through the phosphor material without being absorbed combines with this re-emitted yellow light. This combination of blue and yellow light is perceived by the human eye as a high-quality, broad-spectrum white light, suitable for road and area illumination. In this disclosure “white light” may also refer to light of any wavelength in the visible spectrum covering a broad spectrum, or a combination of light with energy peaks within the visible light spectrum.
[0102] The detailed construction of the reflector 103’ including the converter (hereinafter “the converter and reflector) will now be further described with reference to Figure 1b.
[0103] In the embodiment 100’ where the light source is a laser source, the reflector 103’ is adapted to function as a converter and reflector. This subassembly includes an upper laser reflecting unit 104 and a lower laser converting and reflecting unit 105'. The upper unit 104 receives the incoming laser beam from the transfer media 102, and the interaction between the upper unit 104 and the lower unit 105' facilitates the conversion and subsequent reflection of light towards the atmosphere.
[0104] Within this converter and reflector, the upper laser reflecting unit 104 reflects the incoming laser beam onto the lower laser converting and reflecting unit 105' . The unit 105' then performs its dual function: it first converts the laser beam into white light and subsequently redirects and evenly distributes this converted light onto the road surface, ensuring uniform illumination.
[0105] Preferably, the laser converting and reflecting unit 105' may also incorporate a diverging lens for deflecting the rays of the converted light, causing them to spread apart for directing the illumination to a more widespread area.
[0106] Alternatively, the unit 105' may incorporate a converging lens for deflecting the rays of the converted light so they come closer together to a point, directing the illumination to a more concentrated area. While the converter and reflector in this example embodiment includes a pair of an upper laser reflecting unit 104 and a lower laser converting and reflecting unit 105' , it may also include multiple number and different combinations of these units for directing the converted light ray to a plurality of areas.
[0107] Previously described embodiments may also include a laser convertor when a laser source is used.
[0108] For example, referring to Figure 2, the road light 200’ may incorporate a combination of components: a laser emitting device 1201, a solar tube 202, and a laser converter and reflector 203’ . The laser emitting device 201, which serves as the primary laser source, is positioned underneath a lower end 202a of the solar tube 202 while the laser converter and reflector 203’ is positioned above an upper end 202b of the solar tube 202. The operation is similar as laser emitted from the lowermost laser emitting device 201 is transmitted to the uppermost laser converter and reflector 203’ , whereby the laser is then converted into light and emitted from the uppermost position to the lower ground level.
[0109] In an embodiment utilizing a laser source 1201, the apparatus may be specifically adapted for the transmission and conversion of a laser beam. As shown in Figure 3, the transfer media 302 features a highly reflective interior surface 304 to efficiently guide the laser beam. At the first end 302a, a plano-convex lens 310 may be used to collimate the laser beam from the source 1201, focusing it for its travel through the enclosed pathway to the second end 302b.
[0110] With reference to Figure 4, a laser converter and reflector 403’ is mounted at the second end of the transfer media. Its interior surfaces 404 may be designed to receive the laser beam and direct it onto a phosphor material integrated within the unit. Here, the laser beam is converted into broad-spectrum white light.
[0111] This converted light may then be reflected and directed downwards through a translucent cover 405, which serves as the final distribution point. The cover 405 ensures the converted light is evenly distributed onto the road surface, creating uniform illumination. The final light distribution can be shaped to converge or diverge by adjusting the geometry of the reflector walls 410a-410d and the surface area of the cover 405, similar to the previously described embodiments, where the reflector 403’ includes converter and reflectors 403a’ -403d’ which are connecting to reflector walls 410a –410d as shown in the Figure.
[0112] Similarly, this laser-to-light conversion mechanisms can be applied to various designs. For instance, in the decorative light post 800’s hown in Figure 8, a portable laser emitting device 1201 is installed at the base, and the converter and reflector 803’a t the top performs the conversion and directs the illumination. Furthermore, referring to Figures 10 and 11, the converter and reflector (1003’ , 1103’ ) can be made adjustable to control the direction of the final converted light after converting the laser beam to broad spectrum illumination.
[0113] Advantageously, the street light design of the present invention brings about substantial advantages that enhance various aspects of lighting maintenance and operation.
[0114] Firstly, the relocation of the light bulb to the base of the road light significantly reduces maintenance duration. This eliminates the need for time-consuming operations at heights, such as using elevating platform trucks, enabling maintenance personnel to access the light source more easily and efficiently. As a result, maintenance tasks can be completed in shorter timeframes, leading to improved productivity and reduced disruption to road users.
[0115] Secondly, the elimination of operations at heights is a significant advantage of this design. By positioning the light source at ground level, maintenance personnel no longer need to work at elevated heights, mitigating safety risks associated with working on elevated platforms or ladders. This not only enhances worker safety but also simplifies the maintenance process, as tasks can be carried out more conveniently and comfortably from ground level.
[0116] Thirdly, improved accessibility for maintenance tasks is achieved through the innovative design. With the light bulb located at the base of the road light, maintenance personnel have easier access to the light source and can perform necessary maintenance more efficiently. This improved accessibility streamlines maintenance operations, reducing the time and effort required to complete tasks and enhancing overall maintenance effectiveness.
[0117] Fourthly, the new street light design reduces glare, benefiting both road users and pedestrians. The incorporation of a solar tube and reflective tunnel ensures that the light emitted by the bulb is efficiently guided along the interior surface, minimizing unwanted glare. This results in a more comfortable and safer lighting environment, reducing the potential for visual discomfort or impairment for drivers and pedestrians.
[0118] Additionally, the new street light design may also allow for the projection or focus of the light to be adjusted so as to assist in the direction and focus of the light to specific surfaces. Accordingly, the street light may be controlled by adjustment of the reflector device to direct and project the light at a desired location or surface, such as a road surface, or other areas, including walls or buildings. The adjustment may also be controlled by adjustment mechanisms, such as servos to direct the light to follow or track a specific object.
[0119] Lastly, the design eliminates or significantly reduces the need for temporary road closures or diversions during maintenance activities. With reduced maintenance duration and improved accessibility, the frequency and duration of road disruptions are minimized. This leads to smoother traffic flow, reduced inconvenience for motorists, and improved overall road safety.
[0120] It will be appreciated by persons skilled in the art that numerous variations and / or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
[0121] Any reference to prior art contained herein is not to be taken as an admission that the information is common general knowledge, unless otherwise indicated.
Claims
1.A lighting apparatus, comprising:- a light source arranged to emit a light beam; and- a light transfer media arranged to receive the emitted light beam from the light source at a first end and to transfer the received light beam to a second end to provide illumination from the second end;- wherein the light source is accessible by a user from a lower position and the second end of the light transfer media is arranged to provide the illumination from an elevated position relative to the light source.2.A lighting apparatus in accordance with claim 1, wherein the light transfer media comprises an internal pathway with a light reflective surface through which the light beam is reflected from the first end to the second end.3.A lighting apparatus in accordance with claim 2, wherein the light transfer media comprises a solar tube with a light reflective interior surface forming an enclosed tunnel-like pathway through which the light beam is directed upwards to the second end.4.A lighting apparatus in accordance with claim 3, wherein the solar tube further comprises an intermediate PVC layer arranged to cover the light reflective interior surface and an external metal shell arranged to cover the PVC layer.5.A lighting apparatus in accordance with claim 1, further comprising a reflector arranged to receive the light beam from the second end and to deflect the received light beam towards the lower position.6.A lighting apparatus in accordance with claim 5, wherein the reflector further includes a light reflecting unit with a reflective interior surface and a light directive unit, the light reflecting unit arranged to reflect the light onto the light directive unit through the reflective interior surface and the light directive unit is arranged to redirect and evenly distribute the reflected light towards the lower position.7.A lighting apparatus in accordance with claim 6, wherein the light directive unit further comprises a translucent cover for evenly distributing the light onto the lower position.8.A lighting apparatus in accordance with claim 7, wherein the light directive unit is arranged to be adjustable to direct the light into a desired direction.9.A lighting apparatus in accordance with claim 1, wherein at least a portion of the light transfer media is position at a false ceiling.10.A lighting apparatus in accordance with claim 1, wherein the light source is portable and removably installed into the first end of the light transfer media.11.A lighting apparatus in accordance with claim 6, wherein the light source is a laser source arranged to emit a laser beam.12.A lighting apparatus in accordance with claim 11, wherein the laser beam is further converted to the illumination at the second end or by the reflector.13.A lighting apparatus in accordance with claim 12, further comprising a laser converting unit arranged to convert the laser beam to the illumination to be provided towards the lower position.14.A lighting apparatus in accordance with claim 13, wherein the reflector comprises the laser converting unit arranged to convert the laser beam before directing the light converted from the laser beam to provide illumination towards the lower position.15.A lighting apparatus in accordance with claim 14, wherein the laser converting unit is arranged to reflect the converted light onto the light directive unit.