CN103925487A - Anti-glare lamp source - Google Patents

Abstract

The present invention provides an anti-glare light source, comprising a linear light source, at least one sleeve and a dimming element. The linear light source is suitable for providing a light. The at least one sleeve covers at least one end of the linear light source. The dimming element is arranged between the sleeve and the linear light source, wherein the dimming element comprises a plurality of prism portions, which are arranged along the extension direction of the linear light source and cover a part of the linear light source, so that the distribution of the light in the extension direction of the linear light source converges.

Description

Anti-glare light source

technical field

The invention relates to a light source, in particular to an anti-glare light source.

Background technique

Since Edison invented the light bulb, people have been devoting themselves to the development of various light sources to meet various needs, and the invention of light emitting diode (light emitting diode, hereinafter referred to as LED) has realized a light source with small size and high luminous efficiency. , so it has been applied in various lighting devices at present. However, the volume of LEDs is relatively smaller than conventional light bulbs and fluorescent tubes, and generally speaking, the light divergence angle of LEDs is also smaller than that of traditional light bulbs and fluorescent tubes. Therefore, light-emitting diodes are usually combined with other optical elements in order to change the light pattern of the light-emitting diodes. Among them, since the fluorescent tubes made of light-emitting diodes are arranged on both sides of the light guide rod, it is easy for users to observe the lateral light leakage (that is, the so-called glare) of the fluorescent tubes at a small elevation angle. It can cause discomfort and even affect vision. Generally speaking, the glare will cause obvious damage to the health of eyesight within 30 seconds to 60 seconds. Therefore, how to develop light-emitting diode fluorescent tubes that take into account power saving and low glare is one of the current problems to be solved urgently.

Contents of the invention

The invention provides an anti-glare light source, which is suitable for providing a low-glare light source.

The invention provides an anti-glare light source, which includes a linear light source, at least one sleeve and a dimming element. The linear light source is suitable for providing a light. The sleeve covers at least one end of the linear light source. The dimming element is disposed between the sleeve and the linear light source, wherein the dimming element includes a plurality of prism parts, and these prism parts are arranged along the extending direction of the linear light source and cover part of the linear light source, so that the light beams in the extending direction of the linear light source The distribution converges.

In an embodiment of the present invention, the above-mentioned linear light source includes a light guide rod and at least one light source, and the light source is arranged at at least one end of the light guide rod and located in the sleeve.

In an embodiment of the present invention, the inner wall of the above-mentioned sleeve is a rough surface, and the roughness (Ra) of the inner wall is between 0.1 mm and 100 mm.

In an embodiment of the present invention, each of the above-mentioned prism portions is a strip prism portion, and the extension direction of each strip prism portion is not parallel to the extension direction of the linear light source.

In an embodiment of the present invention, each of the above-mentioned strip prisms is an arc-shaped structure to cover the side of the linear light source.

In an embodiment of the present invention, each of the above-mentioned strip prism parts is a ring structure to cover and surround the side of the linear light source.

In an embodiment of the present invention, the size of the above-mentioned dimming element in the extending direction of the linear light source is between 5 mm and 15 mm.

In an embodiment of the present invention, the inner wall of the sleeve is parallel to the extending direction of the linear light source, and a vertex angle of each prism portion is between 120° and 160°.

In an embodiment of the present invention, the inner wall of the above-mentioned sleeve is not parallel to the extension direction of the linear light source, and the shortest distance between the inner wall of the sleeve and the linear light source is from the end of the linear light source covered by the sleeve to the linear light source. The other end increases gradually, and a vertex angle of each prism part is between 90 degrees and 120 degrees.

In an embodiment of the present invention, the inner wall of the sleeve is parallel to the extending direction of the linear light source, and a vertex angle of each strip prism portion is between 120° and 160°.

In an embodiment of the present invention, the inner wall of the above-mentioned sleeve is not parallel to the extension direction of the linear light source, and the shortest distance between the inner wall of the sleeve and the linear light source is from the end of the linear light source covered by the sleeve to the linear light source. The other end increases gradually, and a vertex angle of each strip prism part is between 90 degrees and 150 degrees.

In an embodiment of the present invention, the included angle between the side of the inner wall of the sleeve and the extending direction of the linear light source is between 5 degrees and 10 degrees.

In an embodiment of the present invention, a vertex angle of each strip prism part is between 90 degrees and 160 degrees.

In an embodiment of the present invention, it further includes a reflective layer disposed on the side of the part of the linear light source.

In an embodiment of the invention, the strip prisms are parallel to each other.

In an embodiment of the present invention, the extending direction of each strip prism portion is substantially perpendicular to the extending direction of the linear light source.

Based on the above, the anti-glare light source in the embodiment of the present invention covers part of the linear light source with the strip prism part of the dimming element arranged between the sleeve and the linear light source, so that the distribution of light in the extending direction of the linear light source can be improved. Convergence can reduce the glare that users can observe at small elevation angles, which is conducive to improving the quality of light output.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1A is a perspective view of an anti-glare light source in an embodiment of the present invention;

Fig. 1B is an exploded view of the anti-glare light source in the embodiment according to Fig. 1A;

Fig. 1C is a longitudinal sectional view of the anti-glare light source in the embodiment according to Fig. 1A;

Fig. 1D is a schematic diagram of a variation of the anti-glare light source in the embodiment according to Fig. 1A;

Figure 2A shows a schematic diagram of the light path of the anti-glare light source in the embodiment of Figure 1A;

FIG. 2B is a schematic diagram of a light path of a variation of the anti-glare light source in the embodiment of FIG. 1A .

Explanation of reference signs:

100: Anti-glare light source;

110: linear light source;

111: light guide rod;

115: light source;

120, 120': sleeve;

130: dimming element;

B, B1, B2, B2': light;

D1: extension direction;

N: inner wall;

PM, PM': strip prism part;

R: reflective layer;

UR: user;

α ₁ , α ₂ , α ₂ ': angle of incidence;

β: elevation angle;

θ, θ': Vertex angle;

ψ: included angle.

Detailed ways

FIG. 1A is a perspective view of an anti-glare light source in an embodiment of the present invention, and FIG. 1B is an exploded view of the anti-glare light source in the embodiment of FIG. 1A . Please refer to FIG. 1A and FIG. 1B , the anti-glare light source 100 of this embodiment includes a linear light source 110 , at least one sleeve 120 and a dimming element 130 . The linear light source 110 is suitable for providing a light B. In this embodiment, the linear light source 110 may include, for example, a light guide rod 111 and at least one light source 115 . The light source 115 may be disposed at at least one end of the light guide rod 111 and located in the sleeve 120 . The sleeve 120 can cover at least one end of the linear light source 110. In this embodiment, the light source 115 and the sleeve 120 are disposed at one end of the light guide rod 111, but the invention is not limited thereto. In other embodiments, the light source 115 and the sleeve 120 can also be disposed on both ends of the light guide rod 111 at the same time. The dimming element 130 is disposed between the sleeve 120 and the linear light source 110 . It should be noted that, for example, the light-adjusting element 130 in FIG. 1A is completely covered by the opaque sleeve 120 and cannot be directly observed. However, in other embodiments, the light-adjusting element 130 can also partially protrude from the sleeve. 120 and can be directly viewed, the present invention is not limited thereto. For example, the size of the dimming element 130 in the extending direction D1 of the linear light source 110 is between 5 mm and 15 mm. In this embodiment, the light source 115 is, for example, a light emitting diode, and the light guide rod 111 can be made by extrusion, but the invention is not limited thereto.

Fig. 1C is a longitudinal sectional view of the anti-glare light source in the embodiment according to Fig. 1A. Please refer to FIG. 1B and FIG. 1C , the dimming element 130 may include a plurality of strip prism parts PM parallel to each other, and these strip prism parts PM are arranged along the extending direction D1 of the linear light source 110 and cover part of the linear light source 110 , and each The extending direction of the strip prism part PM is substantially perpendicular to the extending direction D1 of the linear light source 110 so as to converge the distribution of the light beam B in the extending direction D1 of the linear light source 110 . For example, please refer to FIG. 1C. In this embodiment, when the light B emitted by the light source 115 is transmitted from the inside of the light guide rod 111 to the outside of the light guide rod 111, the strip prism part PM can convert the original light beam with a larger incident The transmission direction of the light B1 incident on the sleeve 120 at the angle _α1 is changed to the transmission direction of the light _B2 incident on the sleeve 120 at the smaller incident angle α2. Therefore, the user UR located under the anti-glare light source 100 can avoid viewing the light B (glare) transmitted by the anti-glare light source 100 at a small elevation angle β. In other words, the dimming element 130 of the anti-glare light source 100 can make the distribution of the linear light source 110 converge to a certain extent in the extending direction D1. It can be seen from FIG. 1C that, compared with the light B1 , the light B2 is less likely to be caused by glare for the user UR at a small elevation angle β.

Figure 1D is a schematic diagram of a variation of the anti-glare light source according to the embodiment of Figure 1A, please refer to Figure 1B and Figure 1D, in detail, in this embodiment, as shown in Figure 1B, each strip prism The part PM is a ring structure to cover and surround the side of the linear light source 110 . Moreover, the anti-glare light source 100 may further include a reflective layer R disposed on the side of part of the linear light source 110 . For example, in this embodiment, the reflective layer R can be disposed on the upper half of the light guide rod 111, as shown in FIG. 1A and FIG. The light B to be emitted from the upper half of the light guide rod 111 is reflected to emit light toward the lower half of the light guide rod 111 . In other words, the reflective layer R can increase the brightness of the anti-glare light source 100 in a specific direction. For example, the reflective layer R can use polyethylene terephthalate (hereinafter referred to as PET) reflective material, polycarbonate (Polycarbonate, hereinafter referred to as PC) white reflective material or metal coating with good reflective properties. High-rate materials are coated on the light guide rod 111, but the present invention is not limited thereto. Please refer to FIG. 1D again, which is similar to the strip prism part PM shown in FIG. 1B , but the strip prism part PM' shown in FIG. 1D is an arc-shaped structure to cover the side of the linear light source 110 instead of surrounding the linear light source 110 . For example, in the anti-glare light source 100 shown in FIG. 1D, since the light B will be reflected by the reflective layer R, the strip prism part PM' only needs to be arranged in the area not covered by the reflective layer R, thus saving The weight and material usage of the strip prism part PM'. Wherein, the material of the strip prism part PM (and PM') can be a transparent material and can have the same or similar refractive index as that of the light guide rod 111. The light guide rod 111 can be further reduced in weight. It should be noted that the sizes and ratios of the light emitting element 115, the light guide rod 111, the reflective layer R, and the strip prism parts PM and PM' in FIGS. 1A to 1D are only used to illustrate this embodiment, and the present invention does not limit.

Please refer to FIG. 1C again. In detail, in this embodiment, a vertex angle θ of each strip prism part PM may be between 90 degrees and 160 degrees. In more detail, the change of the vertex angle θ will change the light path of the light B, however, since the strip prism part PM is shielded by the opaque sleeve 120, if the light transmission path of the light B2 is less incident When the angle _α2 is incident on the sleeve 120, the light B2 is easily absorbed by the inner wall N of the sleeve 120 after being bounced several times, thus reducing the overall light extraction efficiency of the anti-glare light source 100. Therefore, in order to maintain the overall light extraction efficiency of the anti-glare light source 100, at least part of the inner wall N of the sleeve 120 can be roughened. The inner wall N where light is incident is a rough surface, and the roughness (Ra) of the inner wall N can be between 0.1 mm and 100 mm. Therefore, the inner wall N of the sleeve 120 can scatter the light B so that part of the light B re-enters the light guide rod 111 of the linear light source 110 for transmission, and at the same time the sleeve 120 can also shield other unwanted stray light and the self-adjusting element 130 The emitted light helps to maintain the light output efficiency and eliminate the positive glare. In addition, the sleeve 120 can also protect and fix the components in the anti-glare light source.

In addition, FIG. 2A shows a schematic diagram of the light path of the anti-glare light source in the embodiment of FIG. 1A, and FIG. 2B shows a schematic diagram of a light path of a change in the anti-glare light source in the embodiment of FIG. 1A. Please refer to 1C, 2A and 2B, further, in this embodiment, the inner wall N of the sleeve 120 can be parallel to the extension direction D1 of the linear light source 110, and the apex angle θ of each strip prism part PM can be between Between 120 degrees and 160 degrees to change the light path of light B2, so as to alleviate the problem of side glare. However, since the above-mentioned apex angle θ is larger than 90° to 120°, the incident angle _α2 of the light B2 is also relatively large, so that the light B2 can be prevented from being overly convergent and easily damaged by the inner wall N of the sleeve 120. It is absorbed after bouncing several times, so that the light B2 can be transmitted to the inner wall N of the sleeve 120 at an appropriate incident angle _α2 , as shown in FIG. 1C and FIG. 2A, and the light B2 enters again through the reflection of the inner wall N Transmission through the light guide rod 111 of the linear light source 110 also helps to maintain the light extraction efficiency.

Furthermore, in this embodiment, the inner wall N of the sleeve 120' may not be parallel to the extension direction D1 of the linear light source 110, but as shown in FIG. The shortest distance R increases from one end of the linear light source 110 covered by the sleeve 120 ′ to the other end of the linear light source 110 . The included angle ψ between the side of the inner wall N of the sleeve 120 ′ and the extension direction D1 of the linear light source 110 can be between 5 degrees and 10 degrees. In other words, the side of the inner wall N of the sleeve 120 can also be changed directly The included angle ψ with the extension direction D of the linear light source can directly change the incident angle of the light B2 ′ transmitted to the sleeve 120 ′. At this time, a vertex angle θ' of each strip prism part PM may be between 90 degrees and 120 degrees. Therefore, the light B2' can also be transmitted to the inner wall N of the sleeve 120 at a smaller incident angle α ₂ ' than the light B1 in FIG. It enters the light guide rod 111 of the linear light source 110 again, so as to alleviate the problem of side glare and help maintain the light output efficiency.

It should be noted that, in other unshown embodiments, the extending direction of the strip prism part does not have to be substantially perpendicular to the extending direction of the linear light source, that is, the extending direction of the strip prism part can also be the same as The extension direction of the linear light source interposes an angle greater than 0 degrees (that is, not parallel), and the angle is preferably greater than 45 degrees, so that part of the light rays can still be converged in the extension direction of the linear light source. In addition, the strip prisms are not necessarily parallel to each other, that is, the strip prisms can have different extension directions; Curved or otherwise irregularly shaped. Furthermore, the strip prisms can further vary with the distance from the light source, for example: the size, vertex angle, extension direction, shape, density, gap, etc. of the strip prisms can be changed along with the distance from the light source. And change.

It is also worth mentioning that, in other unshown embodiments, the strip prism portion can also be replaced by multiple independent prism portions, for example: multiple independent triangular prisms or conical prisms. Since the independent prism part has many prism surfaces, even a conical prism surface with the entire circumference, the distribution of the linear light source can still be converged to a certain extent in its extending direction. To sum up, the anti-glare light source in the embodiment of the present invention uses an independent prism part or a strip prism part to refract the light emitted from the side of the light guide rod, which can prevent users from observing glare. At the same time, the prism part can also be protected and covered by the sleeve, which can prevent the user from directly observing the light leakage of the prism part, so as to maintain the uniformity of the light output, and reduce the glare that the user can observe at a small elevation angle, and maintain the quality of the light output .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (16)

1. An anti-glare light source, characterized in that, comprising: a linear light source adapted to provide a light; at least one sleeve covering at least one end of the linear light source; A dimming element, arranged between the sleeve and the linear light source, wherein the dimming element includes a plurality of prism parts, and the prism parts are arranged along the extending direction of the linear light source and cover part of the linear light source, so that The distribution of the light rays in the extending direction of the linear light source converges. 2. The anti-glare light source according to claim 1, wherein the linear light source comprises: a light guide rod; and At least one light source is arranged on at least one end of the light guide rod and located in the sleeve. 3. The anti-glare light source according to claim 1, wherein the inner wall of the sleeve is a rough surface, and the roughness of the inner wall is between 0.1 mm and 100 mm. 4. The anti-glare light source according to claim 1, wherein each of the prism portions is a strip prism portion, and the extending direction of each of the strip prism portions is not parallel to the extending direction of the linear light source. 5 . The anti-glare light source according to claim 4 , wherein each strip prism portion is an arc-shaped structure to cover the side of the linear light source. 5 . 6 . The anti-glare light source according to claim 4 , wherein each of the strip prisms is a ring structure to cover and surround the side of the linear light source. 7 . The anti-glare light source according to claim 1 , wherein a dimension of the dimming element in the extending direction of the linear light source is between 5 mm and 15 mm. 8. The anti-glare light source according to claim 1, wherein the inner wall of the sleeve is parallel to the extending direction of the linear light source, and a vertex angle of each prism portion is between 120° and 160° . 9. The anti-glare light source according to claim 1, wherein the inner wall of the sleeve is not parallel to the extension direction of the linear light source, and the shortest distance between the inner wall of the sleeve and the linear light source is determined by the sleeve The end of the covered linear light source increases toward the other end of the linear light source, and a vertex angle of each prism part is between 90 degrees and 120 degrees. 10. The anti-glare light source according to claim 4, wherein the inner wall of the sleeve is parallel to the extending direction of the linear light source, and a vertex angle of each strip prism part is between 120° and 160° between. 11. The anti-glare light source according to claim 4, wherein the inner wall of the sleeve is not parallel to the extension direction of the linear light source, and the shortest distance between the inner wall of the sleeve and the linear light source is determined by the sleeve The end of the covered linear light source increases toward the other end of the linear light source, and a vertex angle of each strip prism part is between 90 degrees and 120 degrees. 12 . The anti-glare light source according to claim 11 , wherein the included angle between the side of the inner wall of the sleeve and the extending direction of the linear light source is between 5 degrees and 10 degrees. 13 . The anti-glare light source according to claim 1 , wherein an apex angle of each prism portion is between 90° and 160°. 14. The anti-glare light source according to claim 1, further comprising a reflective layer disposed on a part of the side of the linear light source. 15. The anti-glare light source according to claim 4, wherein the strip prisms are parallel to each other. 16. The anti-glare light source according to claim 4, wherein the extending direction of each strip prism part is substantially perpendicular to the extending direction of the linear light source.