TWI463095B - Rectangular light of the LED secondary optical lampshade - Google Patents

Description

LED secondary optical lampshade with rectangular illumination

The invention relates to the technical field of an optical lamp cover, in particular to a device which can produce illumination with uniform illumination and rectangular shape to meet the requirements of specific light shape and uniformity of illumination, and has low production cost and easy detection. LED secondary optical lampshade with rectangular illumination.

LED optical lampshades with rectangular illumination are generally known, as disclosed in Taiwan Publication No. M364866 and Taiwan Publication No. 201022592. However, since the curvature of the convex surface of the light-incident surface and the light-emitting surface is designed by the free-form surface formula of the Anamorphic formula and the Toric formula, it is actually produced and tested. It's not easy, and it will increase the cost of production. Moreover, the illuminance of the rectangular illumination produced by the illuminating light is less uniform, and is only applicable to lighting equipment such as street lamps, lamps and photographic flashes that are not required for uniform illumination, and is not suitable for indoor lighting with high illumination uniformity requirements (such as Table lamps, work lights, etc.), outdoor lighting (such as projection lights, lighting, etc.), flat panel display backlights and micro-projection display sources.

In view of the above, the inventors have intensively conceived the above-mentioned problems, and actively researched and improved the trial and development to design the present invention.

The main object of the present invention is to provide a uniform illumination and light Rectangular illumination to meet the requirements of specific light shape and uniformity of illumination uniformity, as well as LED secondary optical lampshade with rectangular illumination with low production cost and easy detection.

The LED secondary optical lamp cover with rectangular illumination according to the present invention is a transparent lens, which comprises a light-emitting surface and a light-incident surface, the light-emitting surface facing the illumination area and having N convexities arranged side by side along the x-axis direction. a cylinder surface, N≧2, having a curvature in the x-axis and the y-axis direction, the light-incident surface facing N-1 LED light sources, and having at least one concave arc surface, the concave arc surface Both the x-axis and the y-axis direction have an arc, and the convex surface of the light-emitting surface and the light-incident surface are designed by using a spherical formula and an oblique incidence formula, so that the light of the LED light source can be different according to the light-incident surface. Curvature changes the divergence angle, and then refracts to the illuminating surface in an obliquely incident manner, and then projects through the plurality of convex cylindrical surfaces of the illuminating surface, so that it can thereby produce illumination with uniform illumination and rectangular shape. It is suitable for indoor lighting (such as table lamps, work lights, etc.) with high uniformity of illumination, outdoor lighting (such as projection lamps, lighting lamps, etc.), flat panel display backlights and micro-projection display sources. In particular, the convex surface of the light-emitting surface and the light-incident surface are designed by using the spherical formula and the oblique incidence formula, so that the production and the detection are easy, and the relative system can greatly reduce the cost.

In the present invention, the N may be 2, 3, 4 or 5, wherein the LED light source is spaced apart in the x-axis direction when the two LED light sources are two, and the LED light source is three-dimensionally arranged along the y-axis direction, the LED light source The array is set for four time systems.

In the present invention, when the LED light source is two or four, the incident surface has Two concave curved faces side by side along the x-axis direction. In order to make the projected illumination more uniform.

Please refer to the first embodiment of the present invention, which is a first embodiment of the LED secondary optical lamp cover with rectangular illumination according to the present invention, wherein the optical lamp cover 10 is a transparent lens, which comprises a light-emitting surface. 11 and a light surface 12.

The light-emitting surface 11 faces the irradiation region and has two convex cylindrical surfaces 13 arranged side by side in the x-axis direction, and the convex cylindrical surface 13 has an arc in both the x-axis and the y-axis direction.

The light incident surface 12 faces an LED light source 20 and has a concave arc shape with an arc in both the x-axis and the y-axis direction.

The convex surface 13 of the light-emitting surface 11 and the light-incident surface 12 are designed by using a spherical surface formula and an oblique incidence formula, so that the light of the LED light source 20 can change the divergence angle according to different curvatures of the light-incident surface 12, Then, it is refracted to the light-emitting surface 11 in an obliquely incident manner, and then projected through the plurality of convex cylindrical surfaces 13 of the light-emitting surface 11 to thereby cause illumination with uniform illumination and a rectangular shape.

Please refer to the ninth to twelfth figures, which is the spherical formula and the source of the oblique incidence formula:

(1) R _x curvature:

Formula outside the triangle ABC: U = ( I - I' ) + U'

The second surface of the tenth graph derives the relationship from Snell's law, and U" is the maximum divergence angle of the LED:

n sin(90°- U' -θ)=sin(90°-θ- U" )

θ is the angle between the circular tangent of the second curved surface passing through the point E and the angle YH, so U' can obtain:

The first surface of the ninth figure is similarly available from Snell’s law:

Sin I = n sin I'

The fourth formula can be obtained by returning to the first formula, and the numerical solution is used to obtain I:

The triangle QGC is equal to the GC side of the triangle B'GC:

R _x sin I' =( R _x - M' )sin U'

The triangle EYH is equal to the EH side of the triangle ESH:

x tan θ=( T - x )tan U"

B'K side of triangle B'KL:

The triangle EHL is equal to the EH side of the triangle EHS:

[ F" -( R _x - d )- x ]tan U" =[ F' -( R _x - d )- x ]tan U'

The distance of SP can be obtained:

Finish the above formula and solve the equation to get the R _x curvature. From the fifth formula, I can get back to the fourth formula to get I'. In the second formula, the U'' decision can solve the U' and substitute it. Solution, only the negative sign R _{x is} greater than 0, taking the positive sign R _x will be less than 0:

among them

(2) R _y curvature:

The outer angle formula of the triangle ADD' of the first surface in the eleventh and twelfth figures:

V' = V + J - J'

V" is the maximum divergence angle of the LED, and the light passes through the second curved surface to obtain V' by Snell's law:

n sin V' =sin V"

Similarly, the first surface can also be obtained by snell’s law:

The second and third formulas are substituted back to the first formula, and V is a hypothetical divergence angle after the shot, so the value of J can be found:

The sum of the sides of the OC and the CD' is equal to N':

The triangle HWS is the same as the HW side of HWD':

T tan V" =[ N' -( N" - T )]tan V'

Substituting the 5th formula into the 6th formula, the finishing can be obtained N":

The sum of the OW edge and the WS edge is equal to N":

N" = R _y - d _y + T

Substituting the seventh formula back to the eighth equation to obtain R _y , and finding the third formula J', V" and V' from the numerical solution of the fourth formula is determined by the second formula:

In the present invention, the x-axis (length) of the rectangular illumination projected through the optical cover 10 is larger than the y-axis (width), and the angular ratio thereof is preferably 7:4, when the appropriate curvature is adjusted and the xy direction is Ratio, you can adjust the proportional change of this angle at will, such as 7:1, 7:2 or 7:3. Moreover, in the design of the optical cover 10, the optical parameters in the above formula can be changed as needed, and then the simulation test is performed by the computer software so that the illumination can meet the expected use effect.

Referring to the thirteenth to fifteenth drawings, which is a second embodiment of the present invention, the structure thereof is substantially the same as that of the first embodiment, except that the light-emitting surface 11 of the second embodiment has side-by-side directions along the x-axis direction. Three convex cylinder faces 13 face the two LED light sources 20 spaced apart in the x-axis direction.

The sixteenth to eighteenth embodiments are the third embodiment of the present invention, and the structure thereof is substantially the same as that of the first embodiment, except that the light-emitting surface 11 of the third embodiment has side-by-side directions along the x-axis direction. Four convex cylinder faces 13 face the three LED light sources 20 spaced apart in the y-axis direction. In this embodiment, the light-incident surface 12 can also face an LED light source 20 or face three LED light sources 20 spaced along the x-axis, and the three LED light sources 20 disposed along the x-axis are disposed. The light incident surface 12 may have three concave curved surfaces (not shown) arranged side by side in the x-axis direction.

Referring to the nineteenth through twenty-first embodiments, the fourth embodiment of the present invention is substantially the same as the second embodiment, except that the light incident surface 12 of the fourth embodiment has an x-axis direction. Two concave curved faces 14 are arranged side by side. This allows the projected illumination to be more uniform.

Since the convex surface 13 of the light-emitting surface 11 of the present invention and the light-incident surface 12 are designed by using a spherical surface formula and an oblique incidence formula, the light of the LED light source can be changed according to different curvatures of the light-incident surface 12 . The divergence angle is then refracted to the illuminating surface 11 in an obliquely incident manner, and then projected through the plurality of convex cylindrical surfaces 13 of the illuminating surface 11 to thereby enable illumination with uniform illumination and a rectangular shape. It is suitable for indoor lighting (such as table lamps, work lights, etc.) with high uniformity of illumination, outdoor lighting (such as projection lamps, lighting lamps, etc.), flat panel display backlights and micro-projection display sources. In particular, the convex surface 13 of the light-emitting surface 11 and the light-incident surface 12 are designed by the spherical formula and the oblique incidence formula, so that the production and the detection are easy, and the relative system can greatly reduce the cost.

In summary, since the present invention has the above advantages and practical value, and has not seen the same or similar technology published or disclosed before, the present invention has met the novelty and progressive requirements of the invention patent, and applied according to law. .

10. . . Optical lamp cover

11. . . Glossy surface

12. . . Glossy surface

13. . . Convex cylinder

14. . . Concave curved surface

20. . . LED light source

The first figure is a perspective view of the front side of the first embodiment of the present invention.

The second figure is a perspective view of the rear side of the second embodiment of the present invention.

The third figure is a front side view of the present invention.

The fourth figure is a schematic view of the A-A section of the third figure.

The fifth figure is a schematic cross-sectional view of the B-B of the third figure.

Fig. 6 is a schematic view showing the state of use of the first embodiment of the present invention.

Fig. 7 is a plan view showing a first embodiment of the present invention.

The eighth figure is a light distribution graph of the first embodiment of the present invention.

The ninth and tenth figures are schematic diagrams for calculating the R _x formula according to the first embodiment of the present invention.

11 and 12 are schematic views showing the calculation of the R _y formula according to the first embodiment of the present invention.

Figure 13 is a schematic view showing the state of use of the second embodiment of the present invention.

Figure 14 is a plan view showing a second embodiment of the present invention.

Fig. 15 is a light distribution graph of a second embodiment of the present invention.

Figure 16 is a schematic view showing the state of use of the third embodiment of the present invention.

Figure 17 is a plan view showing a third embodiment of the present invention.

Figure 18 is a light distribution graph of a third embodiment of the present invention.

Fig. 19 is a schematic view showing the state of use of the fourth embodiment of the present invention.

Fig. 20 is a plan view showing a fourth embodiment of the present invention.

A twenty-first drawing is a light distribution graph of a fourth embodiment of the present invention.

10. . . Optical lamp cover

11. . . Glossy surface

12. . . Glossy surface

13. . . Convex cylinder

20. . . LED light source

Claims (11)

An LED secondary optical lamp cover with rectangular illumination is a transparent lens comprising a light-emitting surface and a light-incident surface, the light-emitting surface facing the illumination area and having N convex cylinders arranged side by side along the x-axis direction, N≧2, the convex cylinder surface has an arc in the x-axis and the y-axis direction, the light-incident surface faces N-1 LED light sources, and has at least one concave arc surface, the concave arc surface is on the x-axis and The y-axis direction has an arc, and the convex surface of the light-emitting surface and the light-incident surface are designed by using a spherical formula and a diagonal incidence formula, so that the light of the LED light source can be changed according to different curvatures of the light-incident surface. The divergence angle is then refracted to the illuminating surface in an obliquely incident manner, and then projected through the plurality of convex cylindrical surfaces of the illuminating surface to thereby enable illumination with uniform illumination and rectangular shape. An LED secondary optical lampshade having rectangular illumination as described in claim 1 wherein the N=2. The LED secondary optical lampshade with rectangular illumination as described in claim 1, wherein the N=3, the two LED light sources are spaced apart along the x-axis direction. The LED secondary optical lamp cover with rectangular illumination as described in claim 3, wherein the light incident surface has two concave curved faces arranged side by side in the x-axis direction. The LED secondary optical lampshade with rectangular illumination as described in claim 1, wherein the N=4, the three LED light sources are spaced apart along the x-axis direction. The LED secondary optical lamp cover with rectangular illumination as described in claim 5, wherein the light incident surface has three concave curved faces arranged side by side in the x-axis direction. An LED secondary optical lamp cover with rectangular illumination is a transparent lens comprising a light-emitting surface and a light-incident surface, the light-emitting surface facing the illumination area and having N convex cylinders arranged side by side along the x-axis direction, N≧4, the convex cylinder surface has a curvature in the x-axis and the y-axis direction, the light-incident surface faces an LED light source, and the light-incident surface has an arc in the x-axis and the y-axis direction, and the light-emitting surface has a curvature The convex surface of the surface and the light entrance surface are designed by using a spherical formula and an oblique incidence formula, so that the light of the LED light source can change the divergence angle according to different curvatures of the light incident surface, and then obliquely incident. The illuminating surface is refracted, and then projected through the plurality of convex cylinders of the illuminating surface to enable illumination with uniform illumination and rectangular shape. An LED secondary optical lamp cover with rectangular illumination is a transparent lens comprising a light-emitting surface and a light-incident surface, the light-emitting surface facing the illumination area and having four convex cylinder faces side by side along the x-axis direction. The convex cylinder surface has an arc in the x-axis and the y-axis direction, and the light incident surface faces three LED light sources arranged at intervals in the y-axis direction, and the light incident surface has one in the x-axis and the y-axis direction. In the arc, the convex surface of the light-emitting surface and the light-incident surface are designed by using a spherical formula and a diagonal incidence formula, so that the light of the LED light source can change the divergence angle according to different curvatures of the light-incident surface, and then obliquely Refracting to the illuminating surface in the manner of incidence, and then projecting through the plurality of convex cylinders of the illuminating surface to cause This enables illumination with uniform illumination and a rectangular shape. The LED secondary optical lamp cover with rectangular illumination according to any one of claims 1 to 8, wherein the convex surface of the light-emitting surface and the light-incident surface are designed by using the formula shown below. (R _x is the curvature of the arc surface in the x-axis direction, and R _y is the curvature of the arc surface in the y-axis direction): The LED secondary optical lampshade with rectangular illumination as described in claim 9 wherein the x-axis (length) of the rectangular illumination projected through the optical cover is greater than the y-axis (width). The LED secondary optical lamp cover with rectangular illumination according to claim 9 , wherein the ratio of the x-axis (length) to the y-axis (width) of the rectangular illumination projected through the optical cover is changed by the spherical formula The various optical parameters are obtained by simulation experiments with computer software.