TWI819927B - Optical element and manufacturing method of optical element - Google Patents

Abstract

Embodiments of the present invention provide optical elements and manufacturing methods of optical elements. By obtaining the grain size, lens size and viewing angle, the first numerical value and the second numerical value are calculated. The first numerical value is the ratio of the grain size to the lens size. There is a polynomial relationship between the second numerical value and the viewing angle, and the second numerical value represents the critical value of the light intensity distribution of the optical element from an axially symmetric distribution to a non-axially symmetrical distribution. When the first numerical value is greater than the second numerical value, the lens layer selects For non-axisymmetric optical lenses, when the first value is less than or equal to the second value, the lens layer selects an axisymmetric optical lens. By determining the selection criteria, the present invention facilitates the selection of the lens layer type and can increase the optical element packaging efficiency.

Description

Optical element and manufacturing method of optical element

The present invention belongs to the technical field of light-emitting diodes, and in particular relates to optical elements and manufacturing methods of optical elements.

At present, in order to meet the needs of high optical radiation wattage and high driving current, the die size usually needs to be above 30mil. For light-emitting diodes with smaller package sizes, the smaller package size causes the primary optical lens size to also need to be smaller. When When the size of the primary optical lens approaches the size of the crystal grain, due to changes in the incident angle of light, the light intensity distribution will change from axial symmetry to non-axial symmetry, resulting in energy dispersion and a decrease in the center intensity of the light intensity distribution. In the existing technology, symmetrical optical lenses such as hemispherical lenses are generally used for normal packaging. For some special packages, in order to ensure the axial symmetry of the light intensity distribution, special-shaped lenses are also used. However, there is currently no efficient selection method for the type of lens to be used. The only way to adaptively select the lens is through the grain size, making the light intensity distribution uncontrollable.

The purpose of embodiments of the present invention is to provide an optical element and a manufacturing method of the optical element, aiming to solve the current problem of uncontrollable light intensity distribution in the lens layer.

In order to achieve the above object, the technical solution adopted by the present invention is: firstly, an optical element is provided, including: a luminescent die, the luminescent die has a lower surface for connecting the substrate and an upper surface opposite to the lower surface. surface, the upper surface is rectangular and has opposite first and second sides, and the luminescent crystal grains have a grain size, and the grain size is the length of the first side and the second side in the longitudinal section. distance on the surface, the longitudinal section is perpendicular to the first side and passes through the central axis of the luminescent die; and a lens package, the lens package includes a lens layer, and the lens layer is a non-axisymmetric optical Lens, the lens layer covers the upper surface of the luminescent die, the lens layer has a bottom facing the luminescent die, the bottom has opposite third and fourth sides, the lens The layer has a lens size, the lens size is the distance between the third side and the fourth side on the longitudinal section, the optical element has a viewing angle, the viewing angle is x, and the grain size The ratio to the lens size is y, where: y>-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1×10 ^-3 x ² -5.6×10 ^-2 x +0.6964.

Preferably, the non-axisymmetric optical lens is a quasi-square lens, the quasi-square lens has a lens central axis, and the bottom of the quasi-square lens has the third side extending along the first direction and the The fourth side and the fifth side and the sixth side extending along the second direction, the first direction is perpendicular to the second direction, the central axis of the lens is perpendicular to the first direction and the second direction, the The quasi-square lens has a first free curve on a first longitudinal section, the first longitudinal section passes through the central axis of the lens and is perpendicular to the first direction, and the quasi-square lens has a second free curve on a second longitudinal section. Curve, the second longitudinal section passes through the central axis of the lens and is perpendicular to the second direction.

Preferably, the first longitudinal section and the second longitudinal section cut the quasi-square lens into four protruding blocks, the protruding blocks have curved surfaces, and the curved surfaces face the direction away from the lens layer. The bottom direction is convex, and the two adjacent curved surfaces are in a mirroring relationship.

-6.69×10^-10 x ⁵+2.40×10^-7 x ⁴-3.26×10^-5 x ³+2.1×10^-3 x ²-5.6×10^-2 x+0.6964。 In a second aspect, another optical element is provided, including: a luminescent die, the luminescent die having a lower surface for connecting to a substrate and an upper surface opposite to the lower surface, the upper surface being rectangular and having opposite The first side and the second side, the luminescent grain has a grain size, the grain size is the distance between the first side and the second side on a longitudinal section, and the longitudinal section is perpendicular to the first side. One side and the central axis of the die passing through the light-emitting die; and a lens package, the lens package includes a lens layer, the lens layer is an axially symmetric optical lens, and the lens layer covers the light-emitting die. On the upper surface, the lens layer has a bottom facing the luminescent die, the bottom has opposite third sides and fourth sides, the lens layer has a lens size, and the lens size is the third The distance between the three sides and the fourth side on the longitudinal section, the optical element has a viewing angle, the viewing angle is x, and the ratio of the grain size to the lens size is y, where: y

-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1×10 ^-3 x ² -5.6 × 10 ^-2 x +0.6964.

Preferably, the axially symmetric optical lens is a hemispherical lens.

Preferably, the optical element further includes the substrate, the light-emitting die is disposed on the substrate and is electrically connected to the substrate, the lens package further includes a light-transmitting layer, the light-transmitting layer is provided on The light-emitting crystal grain is coated on the substrate, and the lens layer is adjacent to the light-transmitting layer.

Preferably, the optical element further includes phosphor, the phosphor is dispersed in the lens package, and the lens layer and the light-transmitting layer are integrally formed.

In terms of third parties, a manufacturing method of an optical element is provided, which includes the following steps: obtaining the viewing angle of the optical element, the grain size of the luminescent die, and the lens size contained in the lens package. The optical element includes the luminescent die and The lens package includes Lens layer, the lens package is used to encapsulate the light-emitting die, wherein the light-emitting die has a lower surface for connecting to the substrate and an upper surface opposite to the lower surface, the upper surface is rectangular and It has an opposite first side and a second side, and the grain size is the distance between the first side and the second side on a longitudinal section, the longitudinal section is perpendicular to the first side and passes through the light emitting The central axis of the crystal grain, the lens layer is used to cover the upper surface of the light-emitting crystal grain, the lens layer has a bottom facing the light-emitting crystal grain, the bottom has an opposite third side and the fourth side, the lens size is the distance between the third side and the fourth side on the longitudinal section; calculate a first value, the first value is the grain size and the lens The ratio of the size; calculate a second numerical value, the second numerical value is a polynomial relationship with the viewing angle, and the second numerical value represents the light intensity distribution of the light element from an axially symmetrical distribution to a non-axially symmetrical distribution a critical value; and when the first value is greater than the second value, the lens layer selects a non-axisymmetric optical lens; when the first value is less than or equal to the second value, the lens layer Choose an axially symmetric optical lens.

Preferably, the non-axisymmetric optical lens is a quasi-square lens, the quasi-square lens has a lens central axis, and the bottom of the quasi-square lens has the third side extending along the first direction and the The fourth side and the fifth side and the sixth side extending along the second direction, the first direction is perpendicular to the second direction, the central axis of the lens is perpendicular to the first direction and the second direction, the The quasi-square lens has a first free curve on a first longitudinal section, the first longitudinal section passes through the central axis of the lens and is perpendicular to the first direction, and the quasi-square lens has a second free curve on a second longitudinal section. Curve, the second longitudinal section passes through the central axis of the lens and is perpendicular to the second direction.

Preferably, the polynomial relationship is: y=-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1×10 ^-3 x ² -5.6×10 ^-2 x +0.6964, where y is the second value and x is the viewing angle.

The beneficial effect of the present invention is that: the embodiment of the present invention calculates the first numerical value and the second numerical value by obtaining the crystal grain size, lens size and viewing angle. The first numerical value is the ratio of the crystal grain size to the lens size, and the second numerical value is the ratio of the crystal grain size to the lens size. There is a polynomial relationship between the viewing angles, and the second value represents the critical value of the light intensity distribution of the optical element from an axisymmetric distribution to a non-axisymmetric distribution. When the first value is greater than the second value, the lens layer selects non-axisymmetric optics. The lens encapsulates the luminescent die. When the first value is less than or equal to the second value, the lens layer selects an axisymmetric optical lens to encapsulate the luminescent die. By determining the selection criteria to facilitate the selection of lens layer types, the efficiency of optical component packaging can be increased. When the edge of the crystal grain and the lens layer gradually approaches, since the curvature of the free-form surface can become larger, the light emitted by the crystal grain can be perpendicular to the tangent plane at the intersection of the quasi-square lens, which has a strong ability to gather light and increases the center intensity. Moreover, the light emitted from the edge of the crystal grain also has the ability to converge toward the center under the refraction of the lens layer, thereby making the light intensity distribution controllable.

1: Optical components

21:Substrate

200: Lens layer

201: Lens package

202: Translucent layer

21:Substrate

210: Quasi-square lens

2101:Protruding block

2103:Third side

2104:Fourth side

2105:Fifth side

2106:Sixth side

2107:First longitudinal section

2108: Second longitudinal section

230: Hemispherical lens

300: Luminous crystal grains

401:First direction

402:Second direction

L: grain size

R: lens size

S101~S105: steps

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings in the following description are only illustrative of the present invention. For some embodiments, for those with ordinary knowledge in the technical field to which the present invention belongs, other drawings can be obtained based on these drawings without making any progressive changes.

Figure 1 is a schematic diagram of the steps of an embodiment of the present invention; FIG. 2 is a schematic diagram of the internal structure of a chip package according to an embodiment of the present invention; FIG. 3 is a top view of a quasi-square lens according to an embodiment of the present invention; FIG. 4 is a side view of a quasi-square lens according to an embodiment of the present invention; and FIG. 5 is a side view of the hemispherical lens according to the embodiment of the present invention.

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings. They are only for convenience of description and do not indicate or imply the device to which they are referred. Or elements must have specific orientations, be constructed and operated in specific orientations, and therefore cannot be construed as limitations to the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can understand the specific meanings of the above terms according to specific circumstances. The terms "first" and "second" are only used for convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. "Plural" means two or more, unless otherwise expressly and specifically limited.

Please refer to Figures 1 to 4. In the embodiment of the present invention, the lens layer 200 can be made of PMMA (polymethylmethacrylate), silicone, PC (polycarbonate), glass or other materials, all of which are optical grade. . And the lens layer 200 described below is a primary lens, wherein the primary lens is directly Encapsulated or bonded on the light-emitting chip 300 (LED chip) and integrated with the light-emitting chip 300. The theoretical light-emitting angle of the light-emitting chip 300 is 360 degrees, but in fact, the light-emitting chip 300 is fixed and processed on the substrate 21 packaging, so the maximum luminous angle of the luminescent die 300 is generally 180 degrees. In addition, the luminescent die 300 also emits some stray light, so a primary lens is required for packaging, and the primary lens collects the light emitted by the luminescent die 300.

In this article, the cross section refers to each plane parallel to the horizontal plane when the lens layer 200 is stably placed on the horizontal plane, and the longitudinal section is a plane perpendicular to the cross section. In addition, in the present invention, when the optical principle is explained through the cooperation of the light-emitting die 300 and the lens layer 200, the light-emitting die 300 should be normally connected to the substrate 21 and be able to emit light normally (refer to the connection of the die in the prior art). This disclosure should not be construed as insufficient.

In the first aspect, please refer to FIG. 2 to provide an optical element 1, which includes: a light-emitting die 300 and a lens package 201. The luminescent die 300 has a lower surface for connecting to the substrate 21 and an upper surface opposite to the lower surface. The upper surface is rectangular and has opposite first and second sides. The luminescent die 300 has a die size L. Dimension L is the distance between the first side and the second side on a longitudinal section, and the longitudinal section is perpendicular to the first side and the central axis of the die passing through the luminescent die 300 .

The lens package 201 includes a lens layer 200. The lens layer 200 is a non-axisymmetric optical lens. The lens layer 200 covers the upper surface of the luminescent die 300, which means that the lens layer 200 is a primary lens. The lens layer 200 has a surface facing the luminescent die 300. The bottom has opposite third sides 2103 and fourth sides 2104. The lens layer 200 has a lens size R, and the lens size R is the distance between the third side 2103 and the fourth side 2104 in the longitudinal section.

The lens package 201 can be understood that the optical element 1 has a viewing angle, the viewing angle is The ratio of centimeters (mm)} is y, and y is greater than the polynomial value of the viewing angle. The specific relationship is: y>-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1 ×10 ^-3 x ² -5.6×10 ^-2 x +0.6964.

In the optical element 1 of this embodiment, by obtaining the viewing angle of the optical element 1 and establishing a polynomial of the viewing angle, when the ratio of the grain size L and the lens size R of the light 1 in this embodiment is greater than the polynomial value of the viewing angle , in order to make the light intensity distribution of light 1 axially symmetrical, the lens layer 200 needs to be a non-axisymmetric optical lens. When the light intensity distribution of optical element 1 is axially symmetrical, it will be beneficial to subsequent applications or secondary optical design.

Please refer to Figures 1 to 4. The present invention determines the size proximity of the luminescent die 300 and the lens layer 200 through the ratio of the die size L to the lens size R. When the edge of the luminescent die 300 and the edge of the lens layer 200 gradually approach When the lens layer 200 is a non-axisymmetric optical lens, the curvature of the free-form surface of the lens layer 200 can be increased, and the light gathering ability is stronger, so that the center intensity is increased, and the light emitted from the edge of the crystal grain is refracted by the lens layer 200 It also has the ability to converge toward the center, thereby making the light intensity distribution controllable.

Please refer to Figures 3 and 4. Preferably, the non-axisymmetric optical lens is a quasi-square lens 210. The quasi-square lens 210 has a lens central axis. The bottom of the quasi-square lens 210 has a third side 2103 extending along the first direction 401. and the fourth side 2104 and the fifth side 2105 and the sixth side 2106 extending along the second direction 402, the first direction 401 is perpendicular to the second direction 402, the central axis of the lens is perpendicular to the first direction 401 and the second direction 402, a quasi-square lens 210 has a first free curve on the first longitudinal section 2107, which passes through the central axis of the lens and is perpendicular to the first direction 401. The quasi-square lens 210 has a first free curve on the second longitudinal section. 2108 has a second free curve, and the second longitudinal section 2108 passes through the central axis of the lens and the perpendicular second direction 402. For example, the first free curve and the second free curve are both convex in a direction away from the bottom of the lens layer 200 to increase the contrast. The ability to gather light. The curvature of the first free curve and the curvature of the second free curve can be changed, so that the light of the luminescent die 300 can be adaptively converged and the concentration and symmetry of the light intensity distribution can be enhanced. For example, the first free curve and the second free curve are the same, and both are parabolas, and the parabolas have a sufficiently large radius of curvature.

It can be understood that the bottom profile of the square-like lens 210 is similar to a rectangle (for example, the sides of the square are replaced by arcs with a certain curvature, namely the third side 2103, the fourth side 2104, the fifth side 2105 and the sixth side 2106).

Preferably, the first longitudinal section 2107 and the second longitudinal section 2108 cut the quasi-square lens 210 into four protruding blocks 2101. The protruding blocks 2101 have curved surfaces, and the curved surfaces protrude toward the direction away from the bottom of the lens layer 200. The two adjacent curved surfaces are in a mirroring relationship, so that the light of the luminescent crystal grain 300 can be adaptively converged and the concentration and symmetry of the light intensity distribution can be enhanced.

Please refer to FIGS. 1 to 4 . In a second aspect, another optical element 1 is provided, including: a light-emitting die 300 and a lens package 201 . The luminescent die 300 has a lower surface for connecting to the substrate 21 and an upper surface opposite to the lower surface. The upper surface is rectangular and has opposite first and second sides. The luminescent die 300 has a die size L. Dimension L is the distance between the first side and the second side on a longitudinal section, and the longitudinal section is perpendicular to the first side and the central axis of the die passing through the luminescent die 300 .

The lens package 201 includes a lens layer 200. The lens layer 200 is an axially symmetrical optical lens. The lens layer 200 covers the upper surface of the luminescent die 300, which means that the lens layer 200 is a primary lens. The lens layer 200 has a surface facing the luminescent die 300. Bottom, the bottom has opposite third side 2103 and fourth side 2104, lens layer 200 has a lens size R, which is the distance between the third side 2103 and the fourth side 2104 in the longitudinal section.

-6.69×10^-10 x ⁵+2.40×10^-7 x ⁴-3.26×10^-5 x ³+2.1×10^-3 x ²-5.6×10^-2 x+0.6964。 It can be understood from the lens package 201 that the optical element 1 has a viewing angle, the viewing angle is x, the ratio of the grain size L to the lens size R is y, y is less than or equal to the polynomial value of the viewing angle, and the specific relationship is: y

-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1×10 ^-3 x ² -5.6 × 10 ^-2 x +0.6964.

In the optical element 1 of this embodiment, by obtaining the viewing angle of the optical element 1 and establishing a polynomial of the viewing angle, the ratio of the grain size L and the lens size R of the light 1 in this embodiment is less than or equal to the polynomial of the viewing angle. In order to make the light intensity distribution of light 1 axially symmetrical, the lens layer 200 needs to be an axially symmetrical optical lens. When the light intensity distribution of optical element 1 is axially symmetrical, it will be beneficial to subsequent applications or secondary optical design.

The present invention determines the size proximity of the luminescent die 300 and the lens layer 200 through the ratio of the die size L to the lens size R. When the edge of the luminescent die 300 and the edge of the lens layer 200 gradually move away, the lens layer 200 is axially symmetrical. When the lens is used, the curvature of the free-form surface of the lens layer 200 can be increased, and the light gathering ability is strong, so that the center intensity is increased, and the light emitted from the edge of the crystal grain also has the ability to converge toward the center under the refraction of the lens layer 200. This makes the light intensity distribution controllable.

Preferably, please refer to FIG. 5 , the axially symmetric optical lens is a hemispherical lens 230 . The hemispherical lens 230 has a longitudinal cross-sectional shape of a semicircle. The hemispherical lens 230 is simple to process, has abundant resources, and can be well adapted to the square light-emitting die 300 .

Preferably, please refer to Figure 2. The optical element 1 also includes a substrate 21. The light-emitting die 300 is provided on the substrate 21 and is electrically connected to the substrate 21. The lens package 201 also includes a light-transmitting layer 202. The light-transmitting layer 202 is provided on the substrate. twenty one The light-emitting die 300 is coated on the chip, and the lens layer 200 is adjacent to the light-transmitting layer 202 . It can be understood that the arrangement of the light-transmitting layer 202 can protect the light-emitting die 300 from damage.

Preferably, the optical element 1 also includes phosphor, and the phosphor is dispersed in the lens package 201. The lens layer 200 and the light-transmitting layer 202 are integrally formed. Through the phosphor disposed in the lens package 201, the optical element 1 can emit uniform white light.

For third parties, please refer to Figures 1 to 3. An embodiment of the present invention provides a manufacturing method of an optical element, which is used to prepare an optical element 1. The manufacturing method of the optical element 1 includes the following steps:

S101: Provide the design structure of the optical element 1. The optical element 1 includes a light-emitting die 300 and a lens package 201. The lens package 201 is used to package the light-emitting die 300. The lens package 201 includes a lens layer 200; the light-emitting die 300 has It is used to connect the lower surface of the substrate 21 and the upper surface opposite to the lower surface. The upper surface is rectangular and has an opposite first side and a second side. The grain size is the distance between the first side and the second side in the longitudinal section. , the longitudinal section is perpendicular to the first side and passes through the central axis of the luminescent die 300. The lens layer 200 is used to cover the upper surface of the luminescent die 300. The lens layer 200 has a bottom facing the luminescent die 300, and the bottom has an opposite The third side 2103 and the fourth side 2104, the lens size is the distance between the third side 2103 and the fourth side 2104 in the longitudinal section;

S102: Obtain the viewing angle x of the optical element 1, the grain size L of the light-emitting chip 300, and the lens size R of the lens layer 200 included in the lens package 201.

Please refer to FIGS. 1 to 3 , where the grain size L refers to the geometric size of the luminescent grain 300 . For example, when the upper surface of the luminescent grain 300 is a square, the grain size L is the side length of the square, and the lens size R refers to the geometric size of the lens layer 200. For example, when the lens layer 200 is a hemispherical lens 230, the lens size R is the diameter of the bottom of the hemispherical lens 230, and the viewing angle (view angle) x refers to the light beam of the optical element 1 The value of the beam angle.

S103: Calculate the first value, where the first value is the ratio of the grain size L to the lens size R, that is, L/R.

It can be understood that the first numerical value represents the proximity between the luminescent die 300 and the lens layer 200 .

Please refer to FIGS. 1 to 3 , taking the hemispherical lens 230 as an example. When the grain size L is much smaller than the size of the hemispherical lens 230 , it can be considered that the luminescent grain 300 is at the center of the hemispherical lens 230 , and most of the emitted light rays are at the center of the hemispherical lens 230 . The surface distances of the hemispherical lenses 230 are equal, and most of the outgoing light rays are perpendicular to the intersection point of the hemispherical lenses 230. Most of the light emitted by the luminous crystal grain 300 is located near the central axis of the hemispherical lens 230, thereby ensuring that the outgoing light is Center strength.

However, when the edges of the light-emitting die 300 and the lens layer 200 gradually approach, since the curvature of the lens does not change accordingly, a small part of the light emitted by the light-emitting die 300 is perpendicular to the tangential plane at the intersection of the hemispherical lens 230. The hemispherical lens 230 has a weak ability to gather light, which causes the central intensity to decrease and the light emitted from the edge of the luminous die 300 to be refracted by the lens layer 200, causing the light distribution to be scattered and uneven.

Obviously, there is no judgment standard that can determine this phenomenon in the existing technology. The shape of the lens layer 200 can only be adjusted based on the light distribution relationship, and then verified and selected through experiments. This not only makes the light intensity distribution uncontrollable, but also affects the packaging efficiency of the optical module. become lower.

S104: Calculate the second value, where the relationship between the second value and the viewing angle x is a polynomial. It should be noted that the second value represents the change in the viewing angle of the designed optical element 1 due to the The change in the ratio of the size L to the lens size R causes the light intensity distribution of the light element 1 after passing through the primary lens to change from an axially symmetrical distribution to a critical value of a non-axially symmetrical distribution.

S105: When the first value is greater than the second value, the lens layer 200 selects a non-axisymmetric optical lens to encapsulate the light-emitting die 300; when the first value is less than or equal to the second value, the lens layer 200 An axially symmetrical optical lens is selected to encapsulate the light emitting die 300 .

Please refer to Figures 1 to 3. Since the first numerical value represents the proximity between the luminescent die 300 and the lens layer 200, the second numerical value represents the critical value of the light intensity distribution from symmetrical distribution to asymmetrical distribution after passing through a lens. , and the second value has a polynomial relationship with the viewing angle x. It can be understood that when the first value is greater than the second value, it will lead to asymmetric light intensity distribution and use a non-axisymmetric optical lens. When the first value is less than or equal to the second value, since the asymmetry of the light intensity distribution does not occur, an axisymmetric optical lens can still be selected to package the light-emitting die 300 .

Please refer to FIGS. 1 to 3 . In the embodiment of the present invention, the first numerical value is calculated by obtaining the grain size L, the lens size R and the viewing angle x. The first numerical value can be used to determine the relationship between the luminescent grain 300 and the lens layer 200 . degree of proximity, and then calculate the second value through the viewing angle x, determine the critical value of the light intensity distribution from symmetrical distribution to asymmetrical distribution after passing through the primary lens, obtain the relationship between the viewing angle When the value is greater than the second value, the quasi-square lens 210 is selected to package the light-emitting die 300. By determining the selection criteria, the type of the lens layer 200 can be easily selected, and the packaging efficiency of the optical element 1 can be increased. When the edge of the luminescent die 300 and the lens layer 200 gradually approaches, since the curvature of the free-form surface can become larger, the light emitted by the luminescent die 300 can be perpendicular to the cross section at the intersection of the quasi-square lens 210, and the ability to gather light is strong. , so that the center intensity is increased, and the light emitted from the edge of the light-emitting chip 300 also has the ability to converge toward the center under the refraction of the lens layer 200, thereby making the light intensity distribution controllable. Moreover, secondary lenses are generally optically designed with symmetrical strength. The quasi-square lens 210 design will not cause problems when used with secondary lenses on the application end.

In one embodiment, the non-axisymmetric optical lens is a quasi-square lens 210. The quasi-square lens 210 has a lens central axis. The bottom of the quasi-square lens 210 has a third side 2103 and a fourth side 2104 extending along the first direction 401 and The fifth side 2105 and the sixth side 2106 extend along the second direction 402, the first direction 401 is perpendicular to the second direction 402, the central axis of the lens is perpendicular to the first direction 401 and the second direction 402, etc. The square lens 210 has a first free curve on the first longitudinal section 2107, which passes through the central axis of the lens and is perpendicular to the first direction 401. The quasi-square lens 210 has a second free curve on the second longitudinal section 2108. The two longitudinal sections 2108 pass through the lens central axis and are perpendicular to the second direction 402 .

In one embodiment, the aforementioned polynomial relationship is: y=-6.69×10 ^-10 x ⁵ +2.40×10 ^-7 x ⁴ -3.26×10 ^-5 x ³ +2.1×10 ^-3 x ² -5.6×10 ^{- 2} x +0.6964, where y is the second value and x is the viewing angle.

It can be understood that this polynomial has applicability and can calculate the second value y according to different viewing angles x. The user can obtain the critical value in different situations according to the transformation of the viewing angle x, and the judgment standard is simple.

For example, when the viewing angle x is 80°, substitute it into the above polynomial, the second value y is 0.3676, and when the grain size L is 0.7mm and the lens size is 1.7mm, at this time, the first value If it is greater than the second value y, it can be determined that the outgoing light intensity distribution is asymmetrical, and the quasi-square lens 210 should be used to improve this situation.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and changes may be made to the present invention by those of ordinary skill in the art to which the present invention belongs. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the patent application of the present invention.

S101~S105: steps

Claims (10)

An optical element, including: a luminescent chip, the luminescent chip has a lower surface for connecting to a substrate and an upper surface opposite to the lower surface, the upper surface is rectangular and has an opposite first side and an On the second side, the luminescent chip has a grain size, the grain size is the distance between the first side and the second side on a longitudinal section, the longitudinal section is perpendicular to the first side and passes through the luminescent chip. a die central axis; and a lens package, the lens package includes a lens layer, the lens layer is a non-axisymmetric optical lens, the lens layer covers the upper surface of the light-emitting die, the lens layer has a surface For a bottom of the luminescent chip, the bottom has a third side and a fourth side opposite to each other, and the lens layer has a lens size, and the lens size is on the longitudinal section of the third side and the fourth side. distance, the optical element has a viewing angle, the viewing angle is x, the ratio of the grain size to the lens size is y, where: . The optical element of claim 1, the non-axisymmetric optical lens is a square lens, the square lens has a lens central axis, the bottom of the square lens has the third side extending along a first direction and The fourth side and a fifth side and a sixth side extending along a second direction, the first direction is perpendicular to the second direction, the central axis of the lens is perpendicular to the first direction and the second direction, the square shape The lens has a first free curve on a first longitudinal section, the first longitudinal section passes through the central axis of the lens and is perpendicular to the first direction, and the square lens has a second free curve on a second longitudinal section, The second longitudinal section passes through the lens central axis and is perpendicular to the second direction. As for the optical element of claim 2, the first longitudinal section and the second longitudinal section cut the square lens into four protruding blocks, and the protruding blocks have a curved surface facing away from the lens layer. The bottom direction of the curve is convex, and the two adjacent curved surfaces are in a mirroring relationship. An optical element, including: a luminescent chip, the luminescent chip has a lower surface for connecting to a substrate and an upper surface opposite to the lower surface, the upper surface is rectangular and has an opposite first side and an On the second side, the luminescent chip has a grain size. The grain size is the distance between the first side and the second side on a longitudinal section. The longitudinal section is perpendicular to the first side and passes through the luminescent chip. a central axis of the die; and a lens package, the lens package includes a lens layer, the lens layer is an axially symmetric optical lens, the lens layer covers the upper surface of the light-emitting die, the lens layer has a surface facing A bottom of the light-emitting chip has a third side and a fourth side opposite to each other. The lens layer has a lens size. The lens size is the distance between the third side and the fourth side on the longitudinal section. distance, the optical element has a viewing angle, the viewing angle is x, and the ratio of the grain size to the lens size is y, where: . As for the optical element described in claim 4, the axially symmetrical optical lens is a hemispherical lens. The optical element according to claim 1 or 4, the optical element further includes the substrate, the light-emitting chip is disposed on the substrate and electrically connected to the substrate, the lens package further includes a light-transmitting layer, the light-transmitting layer The lens layer is disposed on the substrate and covers the light-emitting chip, and is adjacent to the light-transmitting layer. As claimed in claim 6, the optical element further includes a phosphor dispersed in the lens package, and the lens layer and the light-transmitting layer are integrally formed. A method for manufacturing optical components, including the following steps: Obtaining a viewing angle of an optical element, a grain size of a light-emitting chip, and a lens size included in a lens package, the light element includes the light-emitting die and the lens package, the lens package includes a lens layer, the lens package is used to encapsulate the light-emitting chip, wherein the light-emitting chip has a lower surface for connecting to a substrate and an upper surface opposite to the lower surface, the upper surface is rectangular and has an opposite A first side and a second side, the size of the die is the distance between the first side and the second side on a longitudinal section, the longitudinal section is perpendicular to the first side and passes through the center of a die of the luminescent die axis, the lens layer is used to cover the upper surface of the luminescent die, the lens layer has a bottom facing the luminescent die, the bottom has an opposite third side and a fourth side, the lens size is The distance between the third side and the fourth side on the longitudinal section; Calculate a first value, the first value being the ratio of the grain size to the lens size; Calculate a second value, there is a polynomial relationship between the second value and the viewing angle, and the second value represents the critical value of the light intensity distribution of the light element from an axisymmetric distribution to a non-axisymmetric distribution; and When the first value is greater than the second value, the lens layer selects a non-axisymmetric optical lens; when the first value is less than or equal to the second value, the lens layer selects an axisymmetric optical lens. As claimed in claim 8, the non-axisymmetric optical lens is a square lens, the square lens has a lens central axis, and the bottom of the square lens has the third extending along a first direction. three sides and the fourth side and a fifth side and a sixth side extending along a second direction, the first direction is perpendicular to the second direction, and the central axis of the lens is perpendicular to the first direction and the second direction, The square lens has a first free curve on a first longitudinal section, the first longitudinal section passes through the central axis of the lens and is perpendicular to the first direction, and the square lens has a second longitudinal section on a second longitudinal section. Free curve, the second longitudinal section passes through the central axis of the lens and is perpendicular to the second direction. As for the manufacturing method of the optical element described in claim 8, the polynomial relationship is, , where y is the second value and x is the viewing angle.