CN204268369U - Light emitting device and its lens - Google Patents

Abstract

A light emitting device includes at least one light emitting unit and a lens. The lens comprises an incident part and an emergent part. The light inlet part is provided with an accommodating space. The light emitting unit is arranged in the accommodating space. The light inlet part is provided with at least one wedge-shaped structure. The light-emitting part is provided with a plurality of fan-shaped structures which are adjacently arranged. Wherein, the top point of each fan-shaped structure is positioned at the center of the light emergent part. The utility model also provides a lens.

Description

Light emitting device and its lens

technical field

The utility model relates to a light emitting device and a lens thereof.

Background technique

Light emitting diodes (Light Emitting Diode, LED) are widely used in daily life because of their advantages of long life, low power consumption, and low heat generation. Among them, lighting applications are the most common.

Generally speaking, when light-emitting diodes are used in light-emitting devices (such as lamps), due to the needs of some optical characteristics, such as collimating and concentrating light or uniformly scattering light, it is necessary to combine a secondary optical lens with an optical structure with the The light-emitting diodes are packaged together, so that the light-emitting device can achieve desired optical characteristics.

Among them, when the LED chips are arranged in a non-circular and uniform and symmetrical arrangement, in order to solve the problem of uneven light output, fogging, spherical lenses or scale-type total reflection lenses are generally used. However, if a traditional fogged lens or a spherical lens is used, since it produces equal diffusion in all directions, the viewing angle will increase too much and the stray light will increase too much; The problem of non-circular symmetry makes the curvature of the total reflection curve change too much, which makes it impossible to fully reflect the light, resulting in a loss in efficiency.

Therefore, how to provide a light-emitting device and lens that can solve the imaging problem caused by non-circular, uniform and symmetrical arrangement of light-emitting diodes, reduce excessive stray light, and maintain a certain luminous efficiency is currently important. one of the subjects.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a light-emitting diode that can solve the imaging problem caused by non-circular, uniform and symmetrical arrangement of light-emitting diodes, reduce excessive stray light, and maintain a certain luminous efficiency. devices and lenses.

To achieve the above purpose, a light emitting device according to the present invention includes at least one light emitting unit and a lens. The lens includes a light incident portion and a light exit portion. The light incident part has an accommodating space. The light emitting unit is arranged in the accommodating space. The light incident part has at least one wedge-shaped structure. The light exit part has a plurality of adjacently arranged fan-shaped structures. Wherein, the apex of each fan-shaped structure is located at the center of the light emitting part. In one embodiment, the number of wedge structures ranges from 1-5.

In one embodiment, the light incident portion has a central area and an edge area. The central area is set correspondingly to the accommodating space. The wedge-shaped structure is located in the marginal zone.

In one embodiment, the light incident portion has a plurality of wedge-shaped structures. The vertical distance between each wedge-shaped structure and the plane on which the light-emitting unit is disposed will decrease as the vertical distance between each wedge-shaped structure and the central area increases.

In one embodiment, the arc lengths of the arcs of each fan-shaped structure are the same.

In one embodiment, the ratio of the arc length of each arc to the height of each fan-shaped structure ranges from 0.01 to 0.2.

In one embodiment, the outermost wedge-shaped structure has a base at an end close to the light exit portion. The ratio of the arc length of each arc to the length of the base is between 0.5-3.

In one embodiment, the light exit portion has at least one concave ring. The center of the concave ring is the center of the light emitting part.

In one embodiment, the light exit portion has at least one convex ring. The center of the protruding ring is the center of the light emitting part.

In one embodiment, the light exit portion has a plurality of convex rings. The center of the protruding ring is the center of the light emitting part.

To achieve the above purpose, a lens according to the present invention includes a light incident portion and a light exit portion. The light incident part has at least one wedge-shaped structure. The light exit portion has a plurality of adjacently arranged fan-shaped structures. Wherein, the apex of each fan-shaped structure is located at the center of the light emitting part.

In one embodiment, the number of wedge structures ranges from 1-5.

In one embodiment, the light incident portion has a central area and an edge area. The central area is set correspondingly to the accommodating space. A wedge-shaped structure is located in this marginal zone.

In one embodiment, the arc lengths of the arcs of each fan-shaped structure are the same.

In one embodiment, the ratio of the arc length of each arc to the height of each fan-shaped structure ranges from 0.01 to 0.2.

In one embodiment, the outermost concentric circle structure has a base at an end close to the light exit portion. The ratio of the arc length of each arc to the length of the base is between 0.5-3.

In one embodiment, the light exit portion has at least one concave ring. The center of the concave ring is the center of the light emitting part.

In one embodiment, the light exit portion has at least one convex ring. The center of the protruding ring is the center of the light emitting part.

In one embodiment, the light exit portion has a plurality of convex rings. The center of the protruding ring is the center of the light emitting part.

Based on the above, the utility model provides a light-emitting device and its lens. By setting a wedge-shaped structure on the light-incoming part of the lens and setting a plurality of fan-shaped structures on the light-outgoing part, when the light-emitting unit’s light-emitting unit is defined by spherical coordinates direction, the lens with fan-shaped structure optically only diffuses the light on the φ axis, while it will not be affected at all on the θ axis of the viewing angle, thereby reducing the occurrence of excessive stray light and maintaining a certain luminous efficiency .

Description of drawings

FIG. 1A is a three-dimensional schematic diagram of a light emitting device according to a preferred embodiment of the present invention.

FIG. 1B is a three-dimensional schematic diagram of a light emitting device according to another embodiment of the present invention.

FIG. 2 is a partially exploded schematic diagram of the light emitting device shown in FIG. 1A .

3A and 3B are schematic cross-sectional views of the light emitting device in FIG. 2 .

FIG. 4A is a schematic diagram of the appearance of the lens of the light emitting device shown in FIG. 1 .

FIG. 4B is a schematic cross-sectional view of the lens of FIG. 4A on the line A-A.

Figure 4C is a top perspective view of the lens of Figure 4A.

FIG. 4D is an enlarged view of the area C shown in FIG. 4C.

Figure 5 is a spherical coordinate diagram.

6A is a top perspective view of a lens of a light emitting device according to another embodiment of the present invention.

6B is a top perspective view of a lens of a light emitting device according to another embodiment of the present invention.

7A to 7C are schematic cross-sectional views of different embodiments of the lens of the light-emitting device of the present invention.

8 is a schematic cross-sectional view of a lens of a light emitting device according to another embodiment of the present invention.

Detailed ways

A light emitting device and its lens according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

Please refer to FIG. 1A , FIG. 1B , FIG. 2 , FIG. 3A and FIG. 3B. FIG. 1A and FIG. 1B are three-dimensional schematic diagrams of two different embodiments of the light-emitting device of the present invention. FIG. 2 is a partially exploded schematic diagram of the light emitting device shown in FIG. 1A . 3A and 3B are schematic cross-sectional views of FIG. 2 . FIG. 1A and FIG. 1B illustrate possible implementations of different numbers of light emitting units S collocated with lenses.

The light emitting device E of this embodiment includes at least one light emitting unit S (this embodiment takes six light emitting units S as an example) and a lens 1 . In addition, the light emitting device E of this embodiment further includes a bottom plate 2 . Both the light emitting unit S and the lens 1 are disposed on the base plate 2, and in this embodiment, the base plate 2 may be a circuit board.

In addition, the light emitting device E used in this embodiment can be a directional lamp, such as a Par lamp or an MR16 lamp.

It should be noted that the present embodiment does not limit the type, quantity and arrangement of the light emitting units S. In terms of types, the light-emitting unit S can be a light-emitting diode package, a light-emitting diode chip, a tungsten lamp, or other point-shaped or linear light-emitting components. In terms of quantity, although six light-emitting units S are drawn in the drawing, they can be single or multiple, and a single light-emitting unit S can be packaged into a package including multiple light-emitting chips. As far as the arrangement is concerned, the light emitting unit S can be arranged in the center of the corresponding lens 1 , or arranged in a straight line, circle, arc, cross, array or other shapes. Wherein, the light-emitting device E of this embodiment has better efficacy when it is applied to a plurality of light-emitting units S arranged in a shape other than a perfect circle.

Please also refer to FIG. 2 to FIG. 3B , in this embodiment, the lens 1 has a light incident portion 11 and a light exit portion 12, and the lens 1 has at least one wedge-shaped structure W in the light incident portion 11 (in this embodiment, four The wedge-shaped structure W is taken as an example), while the light exit portion 12 has a plurality of adjacently arranged fan-shaped structures F. In addition, the light incident portion 11 has an accommodating space A for accommodating the light emitting unit S. As shown in FIG. In this way, the light emitted by the light emitting unit S passes through the lens 1 and is collimated before leaving the light emitting device E.

It should be noted that, when viewed from the outside, when the lens 1 has a plurality of wedge-shaped structures W, the points formed by the tips of the wedge-shaped structures W are generally concentric circles. Of course, in other embodiments, the lens 1' only includes one wedge-shaped structure W (as shown in FIG. 8 ), and the tip of the wedge-shaped structure W forms a circle centered on the axis of the lens 1'.

Next, the detailed structure and light incident method of the light incident portion 11 will be described. Please refer to FIG. 3A and FIG. 3B for details. In order to correspond to the main area light and the side area light emitted by the light emitting unit S, the light incident portion 11 has a central area 111 and an edge area 112 . The central area 111 receives the main area light, and the edge area 112 is connected to the central area and corresponds to the side area light. Wherein, the light emitted from the main area perpendicular to the light-emitting unit S includes light within a preset angle range. In some embodiments, the preset angle is 20-50 degrees. It should be added that the "light emitted vertically from the light source" described here is defined as the light emitted from the center of each light source.

In addition, a plurality of connected wedge-shaped structures W are disposed on the edge region 112 and arranged sequentially from inside to outside, and each wedge-shaped structure W has a light incident surface 113 and a reflective surface 114 respectively. The light in the side region is incident on the light incident surface 113 of each wedge-shaped structure W, reflected by the corresponding reflective surface 114 of each light incident surface 113 , and exits from the light exit portion 12 . In addition, the vertical distance (shortest distance) between each wedge-shaped structure W and the plane on which the light-emitting unit S is disposed will decrease as the vertical distance between each wedge-shaped structure W and the central region 111 increases. The plane here can be the bottom plate 2 of this embodiment. In addition, the tip of each wedge-shaped structure W (the end point formed by the light-incident surface 113 and its corresponding reflective surface 114 ) is at least not coplanar with the adjacent wedge-shaped structure W. However, this is not limiting, and in other embodiments, the planes formed by the tips of the wedge-shaped structures of the lens are not coplanar.

For example, the vertical distance of the tip of the wedge-shaped structure W will decrease as it moves away from the central region 111, so the vertical distance of the wedge-shaped structure W on the inner circle (h ₁ in this embodiment) will be shorter than that of the wedge-shaped structure on the outer circle. The vertical distance of W is long (h ₃ in this embodiment, and h ₁ >h ₃ ). In addition, the relationship between the vertical distances between the wedge-shaped structures W and the plane in this embodiment can be expressed by the following relational formula: h ₁ ≥ _{h 2} ≥ _{h 3} .

In detail, the central area 111 of the light incident portion 11 in this embodiment may be a curved lens, and the edge area 112 is disposed around the central area 111 . It can be clearly understood from FIG. 2 and FIG. 3A that the plurality of connected wedge-shaped structures W in the edge region 112 of this embodiment will be sequentially arranged from the inside to the outside. The number of each wedge-shaped structure W in the edge region 112 is less than 6, preferably between 1 and 5, and 4 are taken as an example in the figure. The quantity here will be adjusted according to the light source matched with the product and the required directivity. Generally speaking, the more the number of wedge-shaped structures W, the better the overall light directivity.

The reflective surface 114 of each wedge-shaped structure W is connected to the light-incident surface 113 of the next wedge-shaped structure W, and the light-incident surface 113 of the innermost wedge-shaped structure W is connected to the central region 111 . In other words, each wedge-shaped structure W is connected and arranged around the central area 111 . And the reflective surface 114 of the outermost wedge-shaped structure W is connected to the light incident surface 113 .

Please continue to refer to FIG. 3A and FIG. 3B , each of the wedge-shaped structures W has a light incident surface 113 and a reflective surface 114 respectively. Moreover, a wedge angle (acute angle) is formed at the junction of the light incident surface 113 and the reflective surface 114 of each wedge-shaped structure W, and includes a wedge angle θ ₁ . The wedge angle θ ₁ ranges from 8° to 15°, but the wedge angle θ ₁ will be adjusted according to the wedge structure W. In addition, in this embodiment, the angle α1 between the tip of the wedge angle of the innermost wedge-shaped structure W and the center and edge of the light-emitting unit S is greater than the angle _α1 between the tip of the wedge-angle of the outermost wedge-shaped structure W and the center and edge of the light-emitting unit S. The angle α ₂ subtended by the edges.

The wedge-shaped structures W respectively correspond to partial light-emitting angles in the light range emitted by the light-emitting unit S, and the light-emitting angles corresponding to the wedge-shaped structures W are the same or different. Moreover, the light emitting angles corresponding to the wedge-shaped structures W are between 5 degrees and 25 degrees.

Moreover, the light incident surface 113 of each wedge-shaped structure W respectively receives the light within the preset angle range emitted by the light-emitting unit S, and uses the reflective surface 114 of each wedge-shaped structure W to completely reflect the incoming light. . In short, light from the light emitting unit S enters through the light incident surface 113 and is reflected by the reflective surface 114 .

In this embodiment, each wedge-shaped structure W is responsible for total reflection of the light in the side area of the light emitting unit S. As shown in FIG. For example, in FIG. 3B , the innermost wedge-shaped structure W is responsible for total reflection of the light in the side region within the emission angle β1, and the secondary wedge-shaped structure W is responsible for total reflection of the light in the side region within the emission angle β2. The outermost wedge-shaped structure W is responsible for total reflection of the light in the side area within the light emitting angle β3. Lighting angles β ₁ , β ₂ and β ₃ can be the same or different.

Next, the structure of the light emitting portion 12 of the lens 1 of this embodiment will be described. Please refer to FIG. 4A and FIG. 4B at the same time. FIG. 4A is a schematic view of the appearance of the lens of the light-emitting device shown in FIG. 1 , and FIG. 4B is a schematic cross-sectional view of the lens in FIG. Top down perspective view. In this embodiment, the light exit portion 12 has a plurality of fan-shaped structures F arranged adjacently, and the vertex O1 of each fan-shaped structure F is located at the center O of the light exit portion 12 . Wherein, the arcs 121 of the plurality of fan-shaped structures F in this embodiment have the same arc length L, and each fan-shaped structure F has the same area. equally divided into multiple blocks. A plurality of fan-shaped structures F with the same size can make the light from the light incident part 11 uniformly diverge.

Since the lens 1 of the light-emitting device E of this embodiment has a fan-shaped structure F design on the light-emitting surface, when the light-emitting direction of the light-emitting unit S is defined by spherical coordinates (as shown in Figure 5), the light-emitting device E of this embodiment Take the lens 1 located on the X-Y plane of the spherical coordinates as an example (not shown in the figure), in other words, the fan-shaped structure F is located on the X-Y plane of the spherical coordinates, and the lens 1 with the fan-shaped structure F only optically diffuses in φ The light on the axis will not be affected at all on the θ axis of the viewing angle, thereby effectively solving the imaging problem that occurs when the arrangement of the light-emitting units S in the light-emitting device E is not evenly and symmetrically arranged in a perfect circle .

Furthermore, as shown in FIG. 4B and FIG. 4C , in this embodiment, the outermost wedge-shaped structure W has a base portion 115 at an end close to the light-emitting portion 12 . Wherein, the ratio of the arc length L of each arc 121 to the length D of the base portion 115 is between 0.5-3. In practical application, the ratio of the arc length of each arc to the length of the base can be adjusted as shown in FIG. 6A and FIG. 6B .

Taking FIG. 6A as an example, the lens 1a has fan-shaped structures F1 that are more sparsely distributed than the lens 1 , and the ratio of the arc length L1 of the arc 121a of each fan-shaped structure F1 to the length D1 of the base 115a is three. In FIG. 6B , the lens 1 b has fan-shaped structures F2 denser than the lens 1 , and the ratio of the arc length L2 of the arc 121 b of each fan-shaped structure F2 to the length D2 of the base 115 b is 0.5. In other words, the ratio of the arc length of the fan-shaped structure to the length of the base in each of the above embodiments is between 0.5 and 3, and the ratio is adjusted according to actual usage requirements.

In addition, please also refer to FIG. 4B , the fan-shaped structure F of the light exit portion 12 has a height (thickness) in the direction perpendicular to the arc 121. Since the fan-shaped structure F of this embodiment has an uneven surface, it has an uneven surface. Uniform height (Fig. 4B uses height H1, H2 as an example to illustrate). Wherein, the ratio of the arc length L of the arc 121 of each fan-shaped structure F in this embodiment to the heights H1 and H2 of each fan-shaped structure F ranges from 0.01 to 0.2.

Based on the above, through the structural design of the light-emitting device E of this embodiment, the light-incident portion 11 is a plurality of wedge-shaped structures W, so that the light-emitting unit S is formed in the direction of the spherical coordinate r-axis (as shown in FIG. 5 ). Reflect the light and dark bands generated, and use the light exit portion 12 as a combination of multiple fan-shaped structures F to generate light and dark bands in the direction of the φ axis. The scale-shaped block B formed by the combination of the two can produce the same appearance as the scale-shaped transparent diameter (as shown in Figure 4D, Figure 4D is an enlarged view of area C in Figure 4C), and has a relatively well-known scale In other words, the light-emitting device E and its lens 1 of this embodiment can meet the user's requirements for the appearance of the lamp, and can obtain better optical performance.

Next, please refer to FIG. 7A to FIG. 7C , which are schematic cross-sectional views of different embodiments of the lens of the light emitting device of the present invention. In these embodiments, the shape of the light emitting surface will be adjusted according to the required light divergence angle.

Please refer to FIG. 7A first. The lens 1c of this embodiment also includes a light incident portion 11 and a light exit portion 12c. The difference from the previous embodiments is that the light exit portion 12c of this embodiment has at least one concave ring 122c. In actual application, the light emitting portion 12c of the lens 1c may also include a plurality of concave rings 122c, and the present invention is not limited thereto.

Please refer to FIG. 7B , the lens 1d of this embodiment also includes a light incident portion 11 and a light exit portion 12d, and the difference from the previous embodiments is that the light exit portion 12d of the lens 1d of this embodiment has at least one convex ring 124d, and the convex ring 124d is convex. The center of the ring 124d is the center O of the light emitting portion 12d.

Please refer to FIG. 7C, the lens 1e of this embodiment also includes a light incident portion 11 and a light exit portion 12e, and the difference from the previous embodiments is that the light exit portion 12e of the lens 1e of this embodiment has a plurality of convex rings 124e, and each The center of the protruding ring 124e is the center O of the light emitting portion 12e.

It should be noted that the light-emitting devices of the above embodiments can also be fogged on their respective lenses, which does not limit the present invention. In addition, in order to achieve a better effect, the lens of the present invention can also be doped with some heterogeneous materials, such as scattering particles or colorants, to improve the scattering effect or change the color of light emitted.

To sum up, the utility model provides a light-emitting device and its lens. By setting a wedge-shaped structure on the light-incoming part of the lens and setting a plurality of fan-shaped structures on the light-outgoing part, when the light-emitting unit's light-emitting unit is defined by spherical coordinates, direction, the lens with fan-shaped structure optically only diffuses the light on the φ axis, while it will not be affected at all on the θ axis of the viewing angle, thereby reducing the occurrence of excessive stray light and maintaining a certain luminous efficiency .

The above description is only exemplary, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present utility model shall be included in the appended claims.

Claims (19)

1. A lighting device, characterized in that it comprises: at least one lighting unit; and The lens includes a light entrance part and a light exit part, the light entrance part has an accommodating space, the light emitting unit is arranged in the accommodating space, the light entrance part has at least one wedge-shaped structure, and the light exit part has multiple adjacently arranged fan-shaped structures, wherein the apex of each fan-shaped structure is located at the center of the light-emitting part. 2. The light emitting device according to claim 1, wherein the number of the wedge-shaped structures is between 1-5. 3. The light emitting device according to claim 1, wherein the light incident part has a central area and an edge area, the central area is set corresponding to the accommodating space, and the wedge-shaped structure is located at the edge district. 4. The light-emitting device according to claim 3, wherein the light incident portion has a plurality of wedge-shaped structures, and the vertical distance between each wedge-shaped structure and the plane on which the light-emitting unit is arranged will vary with each wedge-shaped structure. The vertical distance of the structure from the central zone increases and decreases. 5. The light-emitting device according to claim 1, wherein the arc lengths of the arcs of each of the fan-shaped structures are the same. 6 . The light emitting device according to claim 5 , wherein the ratio of the arc length of each of the arcs to the height of each of the fan-shaped structures ranges from 0.01 to 0.2. 7. The light-emitting device according to claim 5, wherein the outermost wedge-shaped structure has a base at an end close to the light exit portion, and the ratio of the arc length of each arc to the length of the base is between Between 0.5 and 3. 8. The light emitting device according to claim 1, wherein the light exit portion has at least one concave ring, and the center of the concave ring is the center of the light exit portion. 9 . The light emitting device according to claim 1 , wherein the light exit portion has at least one convex ring, and the center of the convex ring is the center of the light exit portion. 10 . The light emitting device according to claim 9 , wherein the light exit portion has a plurality of convex rings, and the center of the convex rings is the center of the light exit portion. 11 . 11. A lens, characterized in that it comprises: A light incident part and a light exit part, the light incident part has an accommodating space and at least one wedge-shaped structure, and the light exit part has a plurality of fan-shaped structures arranged adjacently, wherein the apex of each fan-shaped structure is located at the light exit center of the department. 12. The lens according to claim 11, wherein the number of the wedge-shaped structures is between 1-5. 13. The lens according to claim 11, wherein the light incident portion has a central area and an edge area, the central area is set corresponding to the accommodating space, and the wedge-shaped structure is located in the edge area . 14. The lens according to claim 11, wherein the arc lengths of the arcs of each of the fan-shaped structures are the same. 15. The lens of claim 14, wherein the ratio of the arc length of each of the arcs to the height of each of the fan-shaped structures is between 0.01 and 0.2. 16. The lens according to claim 14, wherein the outermost wedge-shaped structure has a base at an end close to the light exit portion, and the ratio of the arc length of each arc to the length of the base is between 0.5～3. 17. The lens according to claim 11, wherein the light exit portion has at least one concave ring, and the center of the concave ring is the center of the light exit portion. 18. The lens according to claim 11, wherein the light exit portion has at least one convex ring, and the center of the convex ring is the center of the light exit portion. 19. The lens according to claim 18, wherein the light exit portion has a plurality of convex rings, and the center of the convex rings is the center of the light exit portion.