The object of the current invention is a light stripe and the manufacturing of same. More particularly the object of the invention is a LED light stripe, which comprises an elongated elastic circuit board, to which LEDs (Light Emitting Diode) are connected at regular intervals, and which comprises an insulation layer of a plastic material.
LED light stripes or LED photoconductors are used e.g. to guide the passage of people in various premises, e.g. at airports or in hospitals. They are generally disposed on the floor, and the LEDS comprised in them can be controlled to flash, to run or in some other such desired manner so that the desired guidance function is achieved. Monochromatic LEDs or polychromatic LEDs, e.g. RGB LEDs, can be used in LED light stripes. This type of light stripe can be manufactured in a continuous manufacturing process, such as by extrusion or corresponding. The components used in a light stripe are connected to a thin elastic circuit board with surface-mounting technology. In prior-art LED light stripes light is typically spread upwards from the plane of the circuit board at an angle of approx. 120°. A drawback in these types of prior-art LED light stripes is that the light cannot be directed e.g. to the side.
Also known in the art are solutions wherein a light stripe comprises a lens on top of light-emitting elements. For example U.S. Pat. No. 5,193,895 presents a warning light arrangement, wherein light-emitting elements are connected to a flexible printed circuit board (PCB), and wherein on top is a separate lens part, e.g. of silicon, to be cast as a separate lens part into an aperture in a frame part of rubber-like material. Yet another drawback in these types of prior-art lens solutions, in addition to the aforementioned drawbacks, is the complex manufacturing process they require, because the frame part and the lens part to be cast into the apertures in it must be manufactured in different manufacturing processes.
One drawback in prior-art solutions is also that a light stripe formed from light sources does not produce an even light.
The purpose of this invention is to eliminate the drawbacks of prior art and to achieve an entirely new kind of light stripe, wherein the lens structure in front of the light-emitting elements is formed directly in the insulating material in its manufacturing phase, in which case the lens can be made in the same continuous manufacturing process as also the other insulation material of the stripe. In this way extra manufacturing phases can be avoided, and a very tight structure is obtained from a light stripe according to the invention, in which structure all the insulation layer on top is formed from unbroken insulator material, in which case the lens is thus in the same insulator material.
According to one embodiment of the invention there can be a surface comprising a mirror-like material in the light stripe. By means of this light-reflecting surface the light formed by the light sources, which light reflects onto the mirror-like surface from the inside surface of the insulation material by means of total reflection, reflects from the mirror-like surface strongly into the environment. Thus the impression of the light is more even than in a light stripe that does not comprise a mirror-like surface.
The characteristic features of the light stripe and its manufacturing method according to the invention are described in detail in the independent claims below and preferred embodiments in the other claims. A light stripe can also be called a photoconductor.
In the following, the invention will be described in more detail by the aid of some examples of its embodiments with reference to the attached drawings, wherein
The light stripe according to the invention comprises a lens structure 105 in the longitudinal direction of the stripe arranged on the top surface of the envelope part 104, which lens structure can according to
The stripe element is manufactured in a continuous manufacturing process, such as with an extrusion process from reel to reel with an apparatus according to
The extrusion press comprises a nozzle part 205 that enables a lens surface according to the invention, e.g. according to
With this method it is possible to manufacture a number of parallel stripe parts in the same process and in the same preform, which stripe parts can then be cut apart from each other after the phases presented in the preceding and guided onto a reel. The electrically-conducting coating of the circuit board can, before extrusion, be coated e.g. with a masking color or masking tape 307.
According to one embodiment of the invention there can be a surface comprising an essentially mirror-like material in place of a masking color or masking tape 307. A mirror-like surface means a surface that reflects most of the light coming to it. A mirror-like surface can be formed e.g. from a thin metal film, from plastic or from other material that acts like a mirror as a reflecting surface. In this case the light formed by the light sources, which light reflects onto the mirror-like surface from the inside surface of the envelope part by means of total reflection, reflects from the mirror-like surface strongly into the environment. Thus the impression of the light is more even than in a light stripe that does not comprise a mirror-like surface.
According to one embodiment of the invention the surface to be formed on top of the coating of the circuit board can also be a combination of a masking color or masking tape and an essentially mirror-like surface.
It is obvious to the person skilled in the art that the different embodiments of the invention are not limited solely to the examples described above, but that they may be varied within the scope of the claims presented below. The lens structure is not limited to the embodiment described above, but instead it can also be a structure 305 that deflects light to the side according to
Number | Date | Country | Kind |
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20105289 U | Mar 2010 | FI | national |
20105938 U | Sep 2010 | FI | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/FI2011/050241 | 3/22/2011 | WO | 00 | 9/21/2012 |
Publishing Document | Publishing Date | Country | Kind |
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WO2011/117468 | 9/29/2011 | WO | A |
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