TWI392835B - Led tube - Google Patents

Description

Light-emitting diode tube

The invention relates to a light-emitting diode lamp, in particular to a light-emitting diode lamp with a double-layer structure, to improve the viewing angle of light.

In recent years, light-emitting diode elements have been widely used in the field of illumination, and are used in lighting fixtures and the like.

Since the viewing angle of the current LED light is only about 120 degrees, the LED tube structure is also limited to the above viewing angle, so the viewing angle of the light is compared with the horizontal axis perpendicular to the tube. The conventional fluorescent tube is small; further, in the direction of the longitudinal axis parallel to the tube, since a plurality of light emitting diodes are arranged in the longitudinal axis direction, the area between the two adjacent light emitting diodes is Because the viewing angle of the light is small, a region with a small brightness is formed, so that a phenomenon in which the bright and dark regions are arranged in the vertical axis direction is called a "hot spot", which causes visual discomfort to the user. .

At present, some manufacturers use small-sized LED components arranged on a printed circuit board to narrow the distance between the LED components, thereby improving the brightness of light between adjacent LED components. To alleviate the above-mentioned hot spots, the use of a small-sized light-emitting diode may solve the hot spot problem in the longitudinal direction, but the problem of a small viewing angle in the horizontal axis direction is still not solved.

The inventor of the present invention has invented a structure that is reasonable in design and effective in improving the above problems, in view of the lack of the above-mentioned conventional structure in actual application, and accumulating the experience of individuals engaged in relevant industry development practice for many years, and meticulously researching.

The main object of the present invention is to provide a light-emitting diode lamp tube which is a two-layer structure manufactured by a profile extrusion method, and the double-layer structure includes a lamp tube portion and an optical structure, and the optical structure is a sheet shape and There are two upper and lower surfaces which are not parallel to each other, so that the light refraction effect is generated when the light penetrates the optical structure, so that the light is emitted toward a larger angle, so that the viewing angle of the light can be improved.

In order to achieve the above object, the present invention provides a light emitting diode lamp comprising: a lamp tube portion including at least one light emitting module; and an optical structure integrally formed with the lamp tube portion, wherein the optical structure is located In the light pipe portion and in the light emitting direction of the light emitting module, the optical structure is a one-piece structure, and includes a first surface having at least two side portions and a second surface, wherein the side portions are respectively Having a first curvature, the second surface has a second curvature, the first curvature being greater than the second curvature, whereby the light emitted by the illumination module passes through the optical structure to enhance the visibility of the light angle.

The invention further provides a light-emitting diode lamp comprising: a lamp tube portion provided with at least one light-emitting module; and an optical structure integrally formed with the lamp tube portion, the optical structure being formed on the lamp tube The optical structure is a one-piece structure including a first surface and a second surface not parallel to the first surface, wherein the first surface is larger than the first surface The surface of the first surface is larger than the curvature of the second surface, and the light emitted by the light emitting module is formed by the first surface and the second surface. Secondary light refraction to increase the viewing angle of the above light.

The invention has the following beneficial effects: the invention manufactures the lamp tube portion and the optical structure with the same plastic material or different plastic materials, and the process is mature and stable; in addition, the non-parallel sheet structure and the central portion of the optical structure can be used in the mold design. Part of the cloud gauge structure or optical microstructure is fabricated on the mold, so that the complete lamp tube product can be obtained after the profile extrusion process, and the secondary assembly is not required, so the production efficiency can be effectively improved. In addition, the upper and lower surfaces (ie, the first surface and the second surface) of the optical structure that are not parallel to each other can refract light twice to increase the opening angle of the light, thereby increasing the viewing angle of the light.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

In the following, the invention will be described in detail by way of illustration of exemplary embodiments of the invention, in which

Firstly, the light-emitting diode lamp of the present invention integrally forms a lamp tube portion and an optical structure of the light-emitting diode lamp tube by means of a profile extrusion, and the optical structure can double-refraction the light to improve installation. The optical viewing angle of the light-emitting diode in the light-emitting diode lamp of the present invention. Wherein, the lamp tube portion is an elongated tube body having two ends open, and the optical structure is an elongated sheet-like structure formed in the tube body. For convenience of description of each element, the following figures are all with the LED body tube A cross-sectional view of the cross section perpendicular to the direction of the tube body.

Referring to the first figure, which is a cross-sectional view of a light-emitting diode lamp tube 1 according to a first embodiment of the present invention, the light-emitting diode lamp tube 1 includes at least a lamp tube portion 10 and an optical structure 11, and A light-emitting module 12 is disposed in the lamp tube portion 10, which may be a light-emitting diode. In the embodiment, the light-emitting module 12 is fixedly mounted on the upper surface of a heat sink 20, and the heat sink 20 can be an aluminum extrusion heat dissipation structure to provide a heat dissipation effect. In addition, the light-emitting module 12 can be electrically connected to a plurality of circuit boards (not shown), such as an LED control circuit board or a lamp driving circuit board, etc., and is fixed on the heat sink 20 to provide electrical control.

The optical structure 11 is integrally formed with the lamp tube portion 10. For example, the above-mentioned lamp tube portion 10 and optical are manufactured by using a polymer material through extrusion technology (Extrusion technology, also known as extrusion technology) to manufacture various forms of plastic products. Structure 11. In the present embodiment, a single plastic such as polycarbonate resin (PC) or acrylic resin (Poly Methylmethacrylate) is selected in consideration of light transmittance or other optical and physicochemical properties of the polymer material. , PMMA); or a different material, such as a polycarbonate resin and an acrylic resin, for the extrusion of the optical structure 11 and the tube portion 10 of the present invention, but not limited thereto. For example, the above polycarbonate resin is selected from: manufacturer name: Teijin, product model: LN-2250Z, which has the advantages of resistance to falling, moisture resistance (water absorption of 2%), fire rating up to V-0, molding deformation Small (formation shrinkage is 0.5 to 0.7%), and its light transmittance is 88%; and acrylic resin is selected from the manufacturer name: Chi Mei, product model: CM-205, CM-207, CM-211 The water absorption of 3% and the total light transmittance of 92% are applicable to the tube portion 10 and the optical structure 11 of the present invention.

On the other hand, the optical structure 11 is formed in the light-emitting diode unit 10 and is located in the light-emitting direction of the light-emitting module 12 (as indicated by an arrow), and the optical The structure 11 forms a convex sheet-like structure corresponding to the light-emitting direction, and the optical structure 11 mainly includes a first surface 111 and a second surface 112 not parallel to the first surface 111, wherein, as shown in the first figure As shown, the first surface 111 is further away from the light emitting module 12 than the second surface 112. Overall, the first surface 111 has a larger curvature than the second surface 112, and the curvature of the first surface 111 can be less than or equal to the curvature of the line (the curvature of the line is zero). Since the first surface 111 and the second surface 112 have the above-mentioned differential curvature, when the light emitted by the light-emitting module 12 passes through the optical structure 11, the light first generates a first light refraction on the second surface 112, and then The light further produces a second light refraction on the first surface 111. Therefore, after the above two light refractions, the optical angle of view of the light emitted by the tube portion 10 can be improved.

Referring to FIGS. 2A to 2C, which is a second embodiment of the present invention, which differs from the first embodiment in that the first surface 111 is composed of two side portions 1111 and is located at the two side portions. The central portion 1112 is formed between 1111, and in the specific embodiment, the first surface is further The structural change of 111 cooperates with the second surface 112 to achieve an effect of improving the optical viewing angle of the light. Please cooperate with the second B diagram and the second C diagram at the same time, the two side portions 1111 are respectively the position b1 in the second B diagram (the end point connecting the central portion 1112) and the position c1 (the end connecting the bulb portion 10) Point) and the portion defined between position b2 (the end point connecting the central portion 1112) and the position c2 (the end point connecting the tube portion 10) (i.e., the b1c1 line segment and the b2c2 line segment), and the central portion 1112 is the position b1. a portion defined between the position b2 (ie, the b1b2 line segment); in the present embodiment, the two side portions 1111 each have a first curvature, and the first curvature system is greater than the second curvature of the second surface 112, For example, in the present embodiment, the radius of the tube portion 10 is 17.25 mm, the radius of the two side portions 1111 of the optical structure 11 is 19.12 mm, and the radius of the second surface 112 of the optical structure 11 is It is 20.45 mm; according to the definition of the reciprocal of the radius of curvature (curvature ρ = 1 / R), it can be known that the first curvature system is larger than the second curvature, and the first curvature is obviously larger than the curvature of the straight line.

In addition, the central portion 1112 can be an arc-shaped surface (also referred to as a spline) having a plurality of continuous curvatures. As shown in the second C, the central portion 1112 of the specific embodiment is a cloud gauge line, and the curve A represents the change in curvature, and positions a, b1, b2 represent the corresponding positions in the central portion 1112 of the second B-picture, wherein the position a is a symmetrical point, and the curvature is from the position a to the sides. B1, position b2 forms a linear symmetric relationship, and in the specific embodiment, the coordinate of position a is defined as (0, 8.608), the coordinates of position b1 are defined as (-3.5, 8.712), and the coordinates of position b2 It is defined as (3.5, 8.712), so the width of the central portion 1112 is 7 mm; however, the width of the central portion 1112 can be based on the illumination mode. The size of the group 12 is varied. Specifically, the width of the central portion 1112 is between one-half of the size of the light-emitting module 12 and the size of the three-dimensional light-emitting module 12, that is, one-half Up to three times the range of dimensions of the light-emitting module 12. The invention combines the structural changes of the side portion 1111 on the first surface 111 with the central portion 1112 to achieve the optical viewing angle, and has the effect of increasing the uniformity of light.

In another aspect, referring to FIG. 2A, in the second embodiment, the center 112C formed by the second surface 112 of the optical structure 11 is coaxial with the center 10C formed by the bulb portion 10 (ie, both are located on the optical axis L). And the two side portions 1111 are different arcuate surfaces of different centers, but still have the same curvature, and the centers 1111C formed by the two side portions 1111 are mutually symmetric with respect to the center 112C of the second surface 112. An axis defined by the center 10C of the bulb portion 10 (i.e., the optical axis L).

In another aspect, referring to the first diagram and the second diagram A, the LED diode 1 having a two-layer structure defines two spaces, one being the first surface 111 of the optical structure 11 and the tube portion. The first space 101 defined by 10, the second space 102 defined by the second surface 112 of the optical structure 11 and the lamp tube portion 10, and the lamp tube portion 10 is further formed with a first engaging portion The light in the second space 102 is used for assembling the heat sink 20, whereby the light emitting module 12 can be fixed on the heat sink 20, and the light emitted by the light emitting module 12 can be passed through the first surface 111 and the first surface The two light refractions produced by the two surfaces 112 increase their viewing angle, and at the same time, by the structural changes on the first surface 111 (As shown in Figure A), in addition to improving the viewing angle, the effect of evening the light can be achieved. Please refer to the third figure, which shows the result of the light shape test after the above-mentioned light-emitting module 12 is mounted on the light-emitting diode lamp tube 1 of the second embodiment of the present invention, wherein the structure of the present invention is used as a whole. The optical viewing angle has been greatly increased to 140 degrees, which can improve the application of the product.

In addition, in order to prevent the optical structure 11 from being too close to the light-emitting module 12 and causing the heat generated by the light-emitting module 12 to affect the characteristics of the optical structure 11, the distance between the light-emitting module 12 and the optical structure 11 on the optical axis L is preferably 1 mm or more. Specifically, the distance between the optical structure 11 and the light emitting module 12 is between the following two aspects: the minimum distance between the optical structure 11 and the light emitting module 12 is the second surface 112 of the optical structure 11 The light-emitting surface 121 (ie, the upper surface) of the light-emitting module 12 is contacted; and the maximum distance between the optical structure 11 and the light-emitting module 12 is two-thirds of the light-emitting surface 121 of the light-emitting module 12 to the lamp tube portion. The distance on the optical axis L, that is, the position of the optical structure 11 on the optical axis L may be between the direct contact with the light-emitting surface 121 and the light-emitting direction of the light-emitting surface 121 to two-thirds of the contact with the bulb portion 10. The range of multiple distances.

Please refer to a variant embodiment of the second embodiment shown in FIG. 4, which is different from the second embodiment in that the first curvature of the two side portions 1111 is equal to the curvature of a straight line (curvature of a straight line) 0), the line connecting the position c1 (ie, the end point connecting the tube portion 10) and the position b1 (the end point connecting the central portion 1112) is a horizontal line segment, and the position c2 (ie, the end point connecting the tube portion 10) The line connecting the position b2 (the end point connecting the central portion 1112) is a horizontal line segment: that is, in the side portion 1111, The end point connecting the tube portion 10 is not higher than the end point connecting the central portion 1112. At the optical design angle, the position c1 is not higher than the position b1, and the position c2 is not higher than the position b2. In other words, the two side portions 1111 (i.e., the b1c1 line segment and the b2c2 line segment) must not be higher than the horizontal line segment under the condition that the aforementioned first curvature must be greater than the second curvature.

The fifth figure shows another variation of the second embodiment, which is different from the second embodiment in that the two side portions 1111 can be arcuate surfaces of the same center (ie, the two side portions 1111 In order to imaginaryly connect the surfaces of the same arc, that is, the two side portions 1111 have the same center 1111C.

In addition, in a variant embodiment, the position of the light-emitting module 12 can be installed at a lower position in the second space 102 of the tube portion 10, however, the distance between the optical structure 11 and the light-emitting module 12 The distance condition between the optical structure 11 and the light-emitting module 12 described in the previous paragraph is still satisfied.

The sixth embodiment shows a variation of the embodiment of the fifth embodiment, which is different from the embodiment of the fifth embodiment in that the upper surface of the heat sink 20 is provided with three light-emitting modules 12, and the optical structure 11 is a surface 111 is formed with three central portions 1112 respectively corresponding to the three light-emitting modules 12 having a cloud gauge line structure, for example, the leftmost light-emitting module 12 is corresponding to the central portion 1112 defined by the position b3 and the position b5; The conditions of the central portions 1112 also have the dimensional conditions of the central portion 1112 of the second embodiment. In other words, the lamp tube portion 10 can be provided with a plurality of the light-emitting modules 12, and the first surface 111 of the optical structure 11 can include a plurality of side portions 1111 (ie, a c1b5 line segment, a b3b1 line segment, and a b2b4). The line segment and the b6c2 line segment) and the plurality of the side portions 1111 are respectively located between the two side portions 1111 to correspond to the central portion 1112 of the light-emitting module 12 (ie, the b5b3 line segment, the b1b2 line segment, and the b4b6 line segment), and each of the central portions 1112 The width is between one-half and three times the size of the corresponding light-emitting module 12 corresponding thereto. For convenience of explanation, each side portion 1111 of the present embodiment may constitute an arcuate surface of the same center 1111C. However, in other possible embodiments, the plurality of side portions 1111 may be arcuate surfaces constituting different centers but having the same curvature; or the plurality of side portions 1111 may be divided into the side portions 1111 located on the left side of the optical axis L by using the optical axis L. And the side portion 1111 located on the right side of the optical axis L, the side portions 1111 on the same side of the optical axis L are all the same center, and the side portions 1111 on the different sides of the optical axis L are different centers, and the above-mentioned sides are located on the optical axis L The center of the side portion 1111 is still symmetrical with each other (that is, the plurality of light-emitting modules 12 are directly applied to the second A-picture, so that they have corresponding plurality of cloud-line structures), and many of the above possible variations are also within the scope of the present invention. .

The seventh embodiment shows a third embodiment of the present invention. In the same manner as the second embodiment, the optical structure 11 is formed in the lamp tube portion 10 and located in the light emitting direction of the light emitting module 12. The optical structure 11 includes The first surface 111 and the second surface 112 are not parallel to the first surface 111, and the first surface 111 is also composed of two side portions 1111 and a central portion 1112. For detailed structure, refer to the second embodiment. The difference between the present embodiment and the second embodiment is that the optical structure 11 of the present invention and the surface of the tube portion 10 located at the light exiting region can be provided with optical microstructures to improve light uniformity, for example, in the present embodiment. In an embodiment, the second surface 112 of the optical structure 11 is provided with a plurality of protrusions 1121, values It should be noted that the above-mentioned convex portion 1121 is also integrally formed by the extrusion molding technique. Therefore, in addition to improving the optical viewing angle, the convex portions 1121 further have the effect of making the light uniform.

The eighth embodiment shows a fourth embodiment of the present invention. In the same manner as the second embodiment, the optical structure 11 is formed in the lamp tube portion 10 and located in the light emitting direction of the light emitting module 12. The optical structure 11 includes The first surface 111 and the second surface 112 are not parallel to the first surface 111, and the first surface 111 is also composed of two side portions 1111 and a central portion 1112. For detailed structure, refer to the second embodiment. The difference between the embodiment and the second embodiment is that the lamp tube portion 10 is further formed with a second engaging portion 104 in the first space 101 for assembling an optical component 13 , and the optical component 13 can be An optical diffuser or an optical enhancer, but not limited thereto, the optical element 13 may have an effect of making the light uniform. Therefore, in addition to the effect achieved by the fourth embodiment, the optical element 13 further has the effect of making the light uniform.

In summary, the present invention can have one of the following advantages:

1. The present invention utilizes a profile extrusion method to form an optical structure in a tube portion, and the optical structure has two surfaces that are not parallel to each other, so that the emitted light is refraction by the light generated by the upper and lower surfaces to achieve an improvement. The effect of the viewing angle of the light is to increase the viewing angle of the light on the horizontal axis of the tube (the direction in which the horizontal axis is defined as the vertical tube in the present invention).

2. Similarly, the viewing angle in the direction of the longitudinal axis (the direction in which the longitudinal axis of the present invention is parallel to the lamp tube) can be increased, so that the structure of the present invention can reduce the hot spot under the condition of the size of the same light-emitting diode. (hot spot) situation.

3. The invention can utilize the microstructure designed when the extrusion is performed, such as the convex portion provided on the lower surface of the optical structure, various structural forms on the upper surface of the optical structure, or external optical elements to improve the uniformity of light. .

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the equivalents of the present invention are intended to be included within the scope of the present invention.

1‧‧‧Lighting diode lamp

10‧‧‧Lighting Department

101‧‧‧First space

102‧‧‧Second space

103‧‧‧First engagement department

104‧‧‧Second engagement department

11‧‧‧Optical structure

111‧‧‧ first surface

1111‧‧‧ side

1112‧‧‧Central Department

112‧‧‧ second surface

1121‧‧‧ convex

12‧‧‧Lighting module

121‧‧‧Glossy

13‧‧‧Optical components

20‧‧‧ Heat sink

10C, 112C, 1111C‧‧‧ Center

a, b1, b2, b3, b4, b5, b6, c1, c2‧‧‧ position

A‧‧‧ curve

L‧‧‧ optical axis

The first figure is a schematic cross-sectional view of a light-emitting diode lamp according to a first embodiment of the present invention.

2A is a schematic cross-sectional view of a light-emitting diode lamp of a second embodiment of the present invention.

The second B diagram is a partial schematic view of the optical structure of the second A diagram.

The second C diagram is a change in curvature of the central portion of the optical structure in the second embodiment of the present invention.

The third figure is a light pattern of light emitted by the light-emitting diode lamp according to the second embodiment.

The fourth figure is a variation of the second embodiment of the present invention.

The fifth figure is another variation of the second embodiment of the present invention.

The sixth drawing is a variation of the embodiment of the fifth drawing of the present invention.

Figure 7 is a cross section of a light-emitting diode lamp according to a third embodiment of the present invention. schematic diagram.

Figure 8 is a cross-sectional view showing a light-emitting diode lamp of a fourth embodiment of the present invention.

1. . . Light-emitting diode tube

10. . . Lamp department

101. . . First space

102. . . Second space

103. . . First engagement

11. . . Optical structure

111. . . First surface

1111. . . Side

1112. . . Central department

112. . . Second surface

12. . . Light module

121. . . Glossy surface

20. . . Heat sink

10C, 112C, 1111C. . . Center of mind

L. . . Optical axis

Claims (12)

A light-emitting diode lamp comprising: a lamp tube portion, wherein at least one light-emitting module is disposed; and an optical structure integrally formed with the lamp tube portion, the optical structure being formed in the lamp tube portion And in the light-emitting direction of the light-emitting module, the optical structure is a one-piece structure, and includes a first surface and a second surface, wherein the first surface has at least two sides, and the sides The first portion has a first curvature, the second surface has a second curvature, and the first curvature is greater than the second curvature, whereby the light emitted by the light emitting module is formed by penetrating the optical structure Secondary light refraction to increase the viewing angle of the above light. The light-emitting diode lamp of claim 1, wherein the first surface is further away from the light-emitting module than the second surface, and the first surface further comprises a side portion The central part of the light-emitting module corresponds to each other. The illuminating diode lamp of claim 2, wherein the central portion is an arcuate surface having a plurality of continuous curvatures. The light-emitting diode lamp of claim 2, wherein the central portion has a width of between one-half the size of the light-emitting module and three times the size of the light-emitting module. The light-emitting diode lamp according to claim 2, wherein in each of the side portions, an end point connecting the lamp portion is not higher than an end point connecting the central portion, the first A curvature is greater than or equal to the curvature of the line. The light-emitting diode lamp of claim 1, wherein the center of the second surface is coaxial with a center formed by the tube portion, and the side portions are respectively curved to form different centers. The surface is either an arcuate surface that forms the same center of the circle. The light-emitting diode lamp of claim 1, wherein the minimum distance between the optical structure and the light-emitting module is such that the second surface of the optical structure is in contact with the light-emitting surface of the light-emitting module. The maximum distance between the optical structure and the light-emitting module is two-thirds of the distance from the light-emitting surface of the light-emitting module to the optical axis of the light-emitting portion. The light-emitting diode lamp of claim 1, wherein the plurality of light-emitting modules are disposed in the light-emitting portion, and the first surface is opposite to the second light in the light-emitting direction of the light-emitting module. The surface is away from the light-emitting modules, and the first surface includes a plurality of central portions corresponding to the light-emitting modules and a plurality of side portions on opposite sides of the central portions. The light-emitting diode lamp of claim 8, wherein each of the central portions has a width ranging from one-half to three times the size of the light-emitting module corresponding thereto. between. The light-emitting diode lamp of claim 1, wherein the second surface further has an optical microstructure, and the optical microstructure is a plurality of convex portions. The illuminating diode lamp of claim 1, further comprising an optical component disposed in a first space defined by the first surface of the optical structure and the lamp portion, and the illuminating The module is disposed on the second surface of the optical structure and the lamp tube portion The second space, and the optical component is an optical diffusion sheet or an optical brightness enhancement sheet. A light-emitting diode lamp comprising: a lamp tube portion, wherein at least one light-emitting module is disposed; and an optical structure integrally formed with the lamp tube portion, the optical structure being formed in the lamp tube portion And in the light-emitting direction of the light-emitting module, the optical structure is a one-piece structure, comprising a first surface and a second surface not parallel to the first surface, wherein the first surface is smaller than the second surface The surface is away from the light emitting module, and the curvature of the first surface is greater than the curvature of the second surface, whereby the light emitted by the light emitting module is formed by penetrating the first surface and the second surface Secondary light refraction to increase the viewing angle of the above light.