Optical lens
By improving the lens structure, increasing the light emission angle, and reducing dispersion, the problem of uneven illumination in the thin and light-reducing design of the backlight device was solved, and a uniform illumination effect was achieved.
Patent Information
- Application Number
- CN202423143558.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-11-14
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing lens structures are difficult to achieve uniform illumination in the design of thin and light backlight devices, resulting in localized bright spots that affect aesthetics.
An optical lens was designed, which has a light-inlet cavity with a conical structure from the mounting surface to the light-outlet surface. The light-inlet surface is composed of multiple light-inlet parts, each of which is formed by a curved surface array. The light-outlet surface is formed by a free curve rotating around the central axis and transitioning tangentially. The lens is injection molded from a transparent polymer material.
The light emission angle of the lens was increased, the dispersion was reduced, which met the requirements for the thin and light design of the backlight device and achieved uniform illumination.
Smart Images
Figure CN223663205U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lighting equipment technical field, especially a kind of optical lens. BACKGROUND
[0002] LED lamp gradually becomes the mainstream choice of lighting tool due to its advantages of high brightness, energy saving and lightness. The existing ceiling lamp and direct down lamp need LED patch lamp bead and single lens to correspond with each other, and the light source combined by the matrix arrangement of multiple lamp beads and lenses can be irradiated on diffusion plate to realize uniform light emission.
[0003] One of the goals pursued in the industry is to make the lamp thin, when the distance between diffusion plate and lens is too close, it is difficult to fully disperse light using the existing lens structure, resulting in poor uniformity of thin lamp, and there are local bright spots and other defects affecting the appearance. How to improve the design of lens structure to meet the light thin design of backlight device and at the same time achieve the problem of uniform light becomes the problem to be solved in the case. CONTENT OF UTILITY MODEL
[0004] In order to overcome the defects in the prior art, the utility model provides an optical lens which can meet the light thin design of backlight device and at the same time achieve the problem of uniform light.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: an optical lens, characterized by comprising a lens body, the lens body comprises an installation surface and a light emitting surface arranged oppositely, a light inlet cavity is arranged in the lens body and formed by the installation surface, the light inlet cavity forms a tapered structure from large to small in the direction from the installation surface to the light emitting surface, the inner wall of the light inlet cavity forms a light inlet surface, the light emitting surface is formed by rotating a plurality of free curves around a central axis, and the adjacent free curves are smoothly connected.
[0006] Further, the light inlet surface comprises a plurality of light inlet parts combined from top to bottom in the direction from the installation surface to the light emitting surface, each light inlet part is formed by an array of curved surfaces around the central axis, and the number of curved surfaces contained in each light inlet part is consistent.
[0007] Further, the number of curved surfaces in each array of light inlet parts is N, N is a natural number, and N≥6.
[0008] Further, the curved surface of the light inlet part is formed by rotating a light inlet curve around a central axis, an included angle between a line connecting a bottom end to a top end of the light inlet curve and a horizontal plane perpendicular to the central axis is θ, the light inlet surface includes a first light inlet part, a second light inlet part and a third light inlet part from the mounting surface to the light outlet surface, the included angle corresponding to the light inlet curve of the first light inlet part is θ1, the included angle corresponding to the light inlet curve of the second light inlet part is θ2, and the included angle corresponding to the light inlet curve of the third light inlet part is θ3, the range of θ1 is 75°-90°, the range of θ2 is 50°-65°, and the range of θ3 is 25°-45°.
[0009] Further, the radius of the light inlet curve of the first light inlet part is 20mm-150mm, the radius of the light inlet curve of the second light inlet part is 2.5mm-80mm, and the radius of the light inlet curve of the third light inlet part is 0.2mm-2.5mm.
[0010] Further, the radius of each segment of the free curve forming the light outlet surface ranges from 2.5mm to 15mm.
[0011] Further, the light outlet surface is formed by rotating four segments of free curves around a central axis, including a first curve part, a second curve part, a third curve part and a fourth curve part connected in sequence from outside to inside, the central axis is located at the end position of the fourth curve part, the radius of curvature of the first curve part is 2.5mm-4mm, the radius of curvature of the second curve part is 4mm-6mm, the radius of curvature of the third curve part is 6mm-15mm, and the radius of curvature of the fourth curve part is 2.5mm-15mm.
[0012] Further, adjacent free curves forming the light outlet surface are in tangential transition, the light outlet surface forms a concave structure at the central axis, and the concave vertex of the concave structure is on the central axis, and the two free curves symmetrically intersecting at the concave vertex are in tangential transition.
[0013] Further, the mounting surface is provided with a lamp bead placement site, the light inlet cavity is formed from the lamp bead placement site towards the light outlet surface, the height of the light inlet cavity is h1, the distance between the vertex of the light inlet cavity and the center point of the light outlet surface is h2, and the maximum width of the bottom of the light inlet part is W, and the relationship satisfies h1≥1.5W and h2≤0.25h1.
[0014] Further, the lens body is further formed with an outer side wall between the mounting surface and the light outlet surface, and the outer side wall and the mounting surface are provided with a texture.
[0015] As can be seen from the above description of the utility model, compared with the prior art, the optical lens provided by the utility model increases the light emitting angle of the lens and reduces the dispersion of the lens, and can meet the light and thin design of the backlight device and achieve the uniform light requirement.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 For the optical lens structure angle diagram one of the present utility model.
[0017] Figure 2 For the optical lens structure angle diagram two of the present utility model.
[0018] Figure 3 For the optical lens structure angle diagram three of the present utility model
[0019] Figure 4 For the optical lens structure cross-section identification diagram one of the present utility model.
[0020] Figure 5 For the optical lens structure cross-section identification diagram two of the present utility model.
[0021] Figure 6 For the polar coordinate system of the present utility model's distribution curve diagram.
[0022] Figure 7 For the rectangular coordinate system of the present utility model's distribution curve diagram.
[0023] The identification in the drawing corresponds as follows: 1 - mounting surface, 11 - lamp bead placement site, 2 - light exit surface, 21 - first curve portion, 22 - second curve portion, 23 - third curve portion, 24 - fourth curve portion, 3 - light inlet cavity, 31 - first light inlet portion, 32 - second light inlet portion, 33 - third light inlet portion, 4 - outer side wall. DETAILED DESCRIPTION
[0024] The present utility model is further described below through specific embodiments.
[0025] Referring to Figures 1 to 5 The optical lens includes a lens body, the lens body is injection molded from a transparent high molecular material, and the injection molding material includes common polycarbonate (PC), acrylic (PMMA), etc.
[0026] The lens body includes a mounting surface 1 and a light exit surface 2 arranged oppositely, the lens body is provided with a light inlet cavity 3 formed by the mounting surface 1, the light inlet cavity 3 forms a taper structure from large to small in the direction from the mounting surface 1 to the light exit surface 2, and the inner wall of the light inlet cavity 3 forms a light inlet surface. The light exit surface 2 is formed by rotating a plurality of free curves around a central axis, and the adjacent free curves are smoothly connected. The mounting surface 1 is provided with a lamp bead placement site 11, the light inlet cavity 3 is further formed from the lamp bead placement site 11 towards the light exit surface 2, the lens body is further provided with an outer side wall 4 between the mounting surface 1 and the light exit surface 2, and the outer side wall 4 and the mounting surface 1 are provided with a texture.
[0027] The light-incident surface comprises a plurality of light-incident portions combined from the mounting surface 1 to the light-incident surface 2, each light-incident portion is formed by an array of curved surfaces around a central axis, and the number of curved surfaces in each light-incident portion is consistent. The number of curved surfaces in each light-incident portion array is N, N is a natural number, and N≥6, and the embodiment provides a preferred solution of N=8. The curved surfaces of the light-incident portion are formed by rotating a light-incident curve around the central axis, and the included angle between the line connecting the bottom end to the top end of the light-incident curve and the horizontal plane perpendicular to the central axis is θ. The light-incident surface comprises a first light-incident portion 31, a second light-incident portion 32, and a third light-incident portion 33 from the mounting surface to the light-incident surface. The included angle corresponding to the light-incident curve of the first light-incident portion 31 is θ1, the included angle corresponding to the light-incident curve of the second light-incident portion 32 is θ2, and the included angle corresponding to the light-incident curve of the third light-incident portion 33 is θ3. The range of θ1 is 75°-90°, the range of θ2 is 50°-65°, and the range of θ3 is 25°-45°. The radius of curvature of each segment of the free curve forming the light-incident surface 2 ranges from 2.5mm to 15mm. In the embodiment, a preferred solution is provided: the radius of the light-incident curve of the first light-incident portion 31 is 20mm-150mm, the radius of the light-incident curve of the second light-incident portion 32 is 2.5mm-80mm, and the radius of the light-incident curve of the third light-incident portion 33 is 0.2mm-2.5mm.
[0028] In the embodiment, a preferred solution is provided: the light-incident surface 2 is formed by rotating four segments of free curves around the central axis, comprising a first curve portion 21, a second curve portion 22, a third curve portion 23, and a fourth curve portion 24 connected end to end from outside to inside. The central axis is located at the end of the fourth curve portion 24. The radius of curvature of the first curve portion 21 is 2.5mm-4mm, the radius of curvature of the second curve portion 22 is 4mm-6mm, the radius of curvature of the third curve portion 23 is 6mm-15mm, and the radius of curvature of the fourth curve portion 24 is 2.5mm-15mm. Adjacent free curves forming the light-incident surface 2 are tangent to each other. The light-incident surface 2 forms a concave structure at the central axis, and the concave vertex of the concave structure is located on the central axis. The two free curves symmetrically intersecting at the concave vertex are tangent to each other.
[0029] The height of the light-incident cavity 3 is h1, the distance between the vertex of the light-incident cavity 3 and the center point of the light-incident surface 2 is h2, and the maximum width of the bottom of the light-incident portion is W. The relationship satisfies h1≥1.5W and h2≤0.25h1.
[0030] Figure 6 、 Figure 7 The light distribution curve of the optical lens installed on the 2835 or 3535 patch lamp bead of the present application is shown in the following figure. Figure 6 The polar coordinate system light distribution curve, Figure 7 is the light distribution curve in the rectangular coordinate system. It can be seen that the peak angle of the light beam generated by the optical lens is ±75°, and the peak beam angle is about 150°.
[0031] The above is only one specific embodiment of the present application, but the design concept of the present application is not limited thereto, and any non-substantial modification of the present application using the concept should be considered as an infringement of the protection scope of the present application.
Claims
1. An optical lens characterized in that: The lens body comprises opposite mounting surface and light emitting surface, the light emitting cavity is formed in the lens body by the mounting surface, the light emitting cavity forms a taper structure from the mounting surface to the light emitting surface, the inner wall of the light emitting cavity forms the light emitting surface, the light emitting surface is formed by rotating a plurality of free curves around the central axis, and the adjacent free curves are smoothly connected.
2. The optical lens of claim 1, wherein: The light emitting surface comprises a plurality of light emitting parts combined from top to bottom, each light emitting part is formed by an array of curved surfaces around the central axis, and the number of curved surfaces in each light emitting part is consistent.
3. The optical lens of claim 2, wherein: The number of curved surfaces in each light emitting part is N, N is a natural number, and N≥6.
4. The optical lens of claim 2, wherein: The curved surface of the light-gathering section is formed by rotating a light-gathering curve around a central axis. The angle between the line connecting the bottom and top of the light-gathering curve and the horizontal plane perpendicular to the central axis is . The light-incoming surface includes a first light-incoming part, a second light-incoming part, and a third light-incoming part in the direction from the mounting surface to the light-emitting surface. The included angle corresponding to the light-incoming curve of the first light-incoming part is... The included angle corresponding to the light-gathering curve of the second light-gathering part is The included angle corresponding to the light-gathering curve of the third light-gathering section is , The range is 75° to 90°. The range is 50° to 65°. The range is 25° to 45°.
5. The optical lens of claim 4, wherein: The radius of the light emitting curve of the first light emitting part is 20mm-150mm, the radius of the light emitting curve of the second light emitting part is 2.5mm-80mm, and the radius of the light emitting curve of the third light emitting part is 0.2mm-2.5mm.
6. The optical lens of claim 2, wherein: The curvature radius of each free curve forming the light emitting surface is 2.5mm-15mm.
7. The optical lens of claim 6, wherein: The light emitting surface is formed by rotating four free curves around the central axis, comprising first curve part, second curve part, third curve part and fourth curve part from outside to inside, the central axis is located at the end of the fourth curve part, the curvature radius of the first curve part is 2.5mm-4mm, the curvature radius of the second curve part is 4mm-6mm, the curvature radius of the third curve part is 6mm-15mm, and the curvature radius of the fourth curve part is 2.5mm-15mm.
8. The optical lens of claim 1, wherein: The adjacent free curves forming the light emitting surface are tangent to each other, the light emitting surface forms a concave structure at the central axis, and the concave vertex of the concave structure is located on the central axis, and the two free curves symmetrically connected at the concave vertex are tangent to each other.
9. The optical lens of claim 2, wherein: The mounting surface is provided with a lamp bead insertion site, the light inlet cavity is further provided towards the light outlet surface direction from the lamp bead insertion site, the height of the light inlet cavity is , the distance between the top point of the light inlet cavity and the center point of the light outlet surface is , the maximum width of the bottom of the light inlet part is W, the relationship satisfies ≥1.5W, ≤ .
10. The optical lens of claim 1, wherein: The lens body further comprises an outer side wall between the mounting surface and the light emitting surface, and the outer side wall and the mounting surface are provided with a texture.