TWI360666B - - Google Patents

Description

1360666 IX. Description of the Invention: [Technical Field] The present invention relates to a lens and a light source device having the same, and more particularly to a light intensity distribution of a light emitted from a light emitting diode on a light exiting surface a lens and a light source device having the lens. [Prior Art] A conventional direct type backlight module is a cold cathode fluorescent lamp (c〇ld)

Cathode

Fluorescent Lamp (CCFL) is used as a light source. However, since the cold cathode fluorescent lamp needs to occupy a large volume, consumes a large amount of electricity, and contains mercury, it is not environmentally friendly, so it is replaced by a light-emitting diode having a small volume, high luminous efficiency, and long life. Light sources have become a trend. But, er, because the light-emitting diode emits light as a point of light source, that is, the light intensity in the direction of the normality with the normal of the light-emitting surface is the largest, and the light intensity in the direction deviating from the normal is decreasing. A spot of light is clearly visible on the illuminating surface and it is impossible to provide illumination with uniform light intensity distribution. SUMMARY OF THE INVENTION An object of the present invention is to provide a lens which can make a light intensity distribution of a light emitted from a light-emitting semiconductor element uniform on a light-emitting surface. Another object of the present invention is to provide a light source device having a lens having a uniform light intensity distribution on a light exiting surface. Thus, the lens of the present invention is for receiving light emitted by a light-emitting semiconductor element, the lens comprising a bottom surface, a top surface, and a side surface. The bottom surface faces the light emitting semiconductor element to receive light. The top surface is opposite to the bottom surface, and the top surface includes a portion that passes through the bottom surface and is incident on the top surface

5 1360666 An uneven surface structure in which the light deflects without moving directly above the top surface. The side surface extends from the periphery of the top surface to the periphery of the bottom surface, and the light passing through the bottom surface and incident on the side surface emits the lens; the lens shape is gradually increased from the boundary between the top surface and the side surface toward the bottom surface, and the lens The projection of the upper wear surface falls within the range of the lower cross section of the lens. Thus, the light source device having the lens of the present invention comprises a susceptor, a light-emitting semiconductor component, and a lens ό

A light emitting semiconductor element is disposed on the susceptor. The lens is disposed on the base for receiving light emitted by the light emitting semiconductor component, the lens comprising a bottom surface and a top surface. The bottom surface faces the light emitting semiconductor element to receive light. The top surface is opposite the bottom surface, and the top surface includes an uneven surface structure that deflects a portion of the light passing through the bottom surface and incident on the top surface without traveling directly above the top surface. The side surface extends from the periphery of the top surface to the periphery of the bottom surface, and light passing through the bottom surface and incident on the side surface exits the lens; the lens shape is defined by the top surface and the side

The boundary is gradually increased toward the bottom surface, and the projection of the upper cross section of the lens falls within the range of the lower cross section of the lens. In a preferred embodiment of the invention, the top surface of the lens comprises a plurality of convex sections of a continuous surface structure, the convex sections are stepped coaxially arranged in a concentric circle; and 'defining a lens through the lens In the longitudinal section of the central outline/axis, the top surface may be a concave bowl shape or the like, a curved shape of D1, a bottom surface like a sigma-like shape, or a bottom-pointed tapered lens and a light-emitting surface. A preferred embodiment of the invention has the effect that the top of the lens comprises an uneven surface structure. When the light emitted by the light-emitting semiconductor element passes through the bottom surface and enters the top surface, part of the light is deflected by the uneven surface structure. Moving toward the top of the top surface, 'the light intensity in the direction of the normal angle with the normal of the light-emitting surface is reduced rather than the maximum', so that the light intensity in the direction of the light exiting the large angle is increased, and therefore, on the light-emitting surface A light field with a uniform light intensity distribution can be obtained. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 2, FIG. 3 and FIG. 4, a preferred embodiment of the present invention discloses a light source device 2A having a lens 4, which includes a susceptor 2, a light emitting semiconductor component 3, and a lens. 4. The center-axis 19, which is vertically passed through the lens, defines that the light-emitting semiconductor element 3 and the lens 4 are symmetric or nearly symmetrical with respect to the central axis 19. The susceptor 2 is a pedestal used for packaging a light-emitting semiconductor component, and may be a plastic-clad metal bracket, an upright bracket, a flat bracket or a piranha bracket. The light-emitting semiconductor element 3 is provided on the earth base 2 and is encapsulated by a die-bonding wire. Since it is a technique known to those skilled in the art, it will not be described. In the present embodiment, the light emitting semiconductor element 3 is a light emitting diode (LED). The lens 4 is also disposed on the susceptor 2 and encloses the illuminating semiconductor component 3 for receiving light emitted by the illuminating semiconductor component 3. The lens 4 can be injection molded of a generally transparent thermoplastic material such as: Acrylic acid (PMMA), $ & acid | (pC), 4 is a light-transmissive _ type plastic enamel glue, such as: epoxy or silicone (siHc〇ne) can also The light-transparent glass is molded by a mold; the refractive index is preferably between 12 and 18. The lens 4 includes a bottom surface 41, a top surface 42, and a side surface & bottom surface 41 which is in contact with the top surface of the susceptor 2 and faces the light-emitting semiconductor element 3 to receive light. The top surface 42 is opposite to the bottom surface 4b and includes a plurality of convex sections 422' which form an uneven surface structure 421 which are continuously extended in a stepped manner and arranged in concentric circles. The side surface 43 extends from the periphery of the top surface 42 toward the periphery of the bottom surface 41 to form a curved surface. The outer shape of the lens 4 gradually increases from the boundary between the top surface 42 and the side surface 43 toward the bottom surface 41, that is, the distance from the side surface 43 to the central axis 19 is The bottom is gradually increased, and the projection of the upper section of the Wei 4 falls within the range of the lower section of the lens 4. The top surface 42 is generally a concave surface that is recessed toward the center. In the present embodiment, in the longitudinal section of the lens 4 along the central axis 19, the top surface 42 is recessed in a v shape, but is not limited thereto. In other embodiments, such as As shown in Fig. 12, in the longitudinal section along the central axis 19, the top surface 42' may also be an arc having a recessed opening upwardly, or as shown in Fig. 13, the top surface 42" may also be recessed into a horn. The opening shape, or as shown in Fig. 14, the top surface 42" may also be recessed to form a bowl shape having a tapered shape at the bottom. In this embodiment, the central shaft 19 passes through the center of the ν-shaped recess, and the bottom surface 41 is flushed with a light-emitting surface 423 formed by the periphery of the top surface 42, and the light-emitting surface 423 is perpendicular to the central axis 19. The specific dimensions of the lens 4 of this embodiment are as follows, but not limited thereto, the bottom surface 41 of the lens 4 is parallel to the light exit surface 423, and the top and bottom surfaces 42 are all circular, and the diameter D2 of the periphery of the page 42 is equal to 3〇4 The bottom of the bribe, the straight LD1 is equal to 4.97mm, the height Η of the lens 4 is equal to i.5mm. The surface 43 is half the distance between the lower end of the convex section 22 of the spherical surface of i% coffee, which is equal to (10) The distance between two adjacent upper ends of the convex section is equal to... The angle A between one of the inclined surfaces of the top surface 42 of the V-shaped surface and the horizontal light-emitting surface 423 may be equal to any angle such as 3·79 degrees, 7.49 degrees, U.16 degrees, or the like. However, the size (diameter, height, distance between the lower ends of the convex section 422, ...) of the above-mentioned lens 4 is not limited thereto. When the size of the lens 4 is changed, the uniformity of the light intensity distribution can be changed as required; Alternatively, when the size of the susceptor 2 or the light-emitting semiconductor element 3 is changed or the selected light-emitting semiconductor element 3 is different, the size of the lens 4 can be adjusted in accordance with the present invention to obtain a light intensity distribution of the ridge. / After the light emitted from the light-emitting semiconductor element 3 passes through the bottom surface 41 of the lens 4, part of the light is incident on the top surface 42 of the lens 4, and the other part of the light is incident on the side surface 43 of the lens 4 to exit the lens 4; 42 has an uneven surface structure 42. Therefore, the light _ _ portion of the human top surface 42 is deflected and does not travel directly above the top surface 42. Therefore, referring to FIG. 2 and FIG. The light intensity in the direction parallel to 19 (that is, the angle 0 with the normal to the light-emitting surface 423 is equal to the G-degree) becomes smaller, and the light intensity increases as the angle 出 between the light-emitting direction and the normal increases. The light intensity is maximum until the angle of incidence (angle Θ) is approximately equal to positive and negative 45 degrees, and then the light intensity decreases with the angle of light extraction (the angle increases. See Figure 6, when the light intensity is changed from the polar plot) When distributed, it can be seen that the light intensity distribution on the light exit surface 423 is substantially uniform. In the present embodiment, the light exit angle (clamp y) is approximately equal to positive and negative 45 degrees, and the light intensity is maximum, but not This is ~ in the following 'see Figure 2, Figure 7 and Figure 8, and according to the former The components are used to describe the manufacturing method of the light source device having the lens 4. The first step is to mount the light-emitting semiconductor component 3 on the susceptor 2, including the action of solid-crystal bonding, etc. Next, proceed to step 62, providing - The mold 7, the mold 7 includes a top wall 71 having a non-flat surface, a side wall 72' extending obliquely downward from the periphery of the top wall 71, and a cavity 73 defined by the top wall 71 and the side wall 72, the cavity The projection of the upper section of 73 is within the range of the lower section of the cavity 73 (inverted in Fig. 8), that is, the shape of the cavity 73 corresponds to the shape of the lens *. Then, step 63 is performed to transmit light. The gelatinous substance is poured into the cavity 73, wherein the kicking substance may be a thermosetting resin (epc) xy or siliec>ne), etc., but is not limited thereto. Further, step 64 is performed to position the susceptor 2 together with the light-emitting semiconductor element 3 on the mold 7, i.e., the susceptor 2 is inverted to immerse the light-emitting semiconductor element 3 in the gel-like substance. Then, in step 65, baking is performed to cure the light transmissive gelatinous substance. Finally, in step 66, the mold is released, and the solidified gelatinous substance is released from the mold 7, wherein the solidified gel-like substance forms the lens 4' which is smaller in size and larger in size, and since the shape of the lens 4 is upper and lower. Therefore, demoulding is easy. Pay special attention to step 63 and step μ. Although the above steps are first filled and then re-aligned, but those skilled in the art know that it can be used after the first alignment, and then 1360666 glue should not be limited to this, and The relationship between the mold 7 and the susceptor 2 in step 64 is also not limited to the reverse as shown in Fig. 8, that is, the mold 7 may be placed above and the susceptor 2 may be lowered. It should be noted that the method for manufacturing the light source device fan having the lens 4 described above can be completed without using the mold 7. The description of the pot can be completed without using the mold 7. As follows: Referring to FIG. 9 and FIG. 1G, step 81 is first performed, and the lens cover is provided. cover

The 5' lens cover 5 includes a top wall 51 whose outer wall surface is uneven, a (four) 52 which extends obliquely downward from the periphery of the top wall 51, and a chamber 53 which is defined by the top wall 51 and the side wall 52, and the chamber 53 The projection of the upper cross section falls within the range of the lower cross section of the chamber 53. That is, the outer shape of the lens cover 5 corresponds to the outer shape of the lens 4. Next, in step 82, the light-emitting semiconductor element 3 and the susceptor 2 are provided, wherein the discharge conductor element 3 is bonded to the susceptor 2 via a die bond.

Then, step 83 is performed to align the susceptor 2 with the lens cover 5 such that the light-emitting semiconductor component 3 is positioned below the lens permeable cover 5, that is, the light-emitting semiconductor component 3 is located between the lens cover 5 and the susceptor 2. Step 84 is further performed to infiltrate the light transmissive gelatinous substance into the chamber 53 of the lens cover 5. Finally, in step 85, baking is performed to cure the light transmissive gelatinous substance. Further, the present invention further relates to a method of manufacturing a light source device 2A having a lens 4 which is formed by completing the lens 4 and then combining it with the light-emitting semiconductor 7G member 3 and the susceptor 2. Referring to Figure 11, first step 91 is performed, and the provision is as described above.

< S 1360666 The shape of the solid lens 4, the material of the lens 4 can be a light-transmissive thermoplastic polymer, thermosetting plastic or glass, but not limited thereto. Next, in step 92, a light-emitting semiconductor device 3 and a susceptor 2' are disposed, wherein the light-emitting semiconductor device 3 is bonded to the susceptor 2 via a die bond. Then proceeding to step 93 'the top surface of the susceptor 2 and the bottom surface 41 of the lens 4 are only joined' such that the illuminating semiconductor element 3 is located below the lens 4, that is, the illuminating semiconductor element 3 is located between the lens 4 and the susceptor 2, and the lens 4 and the base The seat 2 can be glued to fix it. This method differs from the other methods in that the aforementioned method is to provide a lens cover 5 for use in the hollow, and this method uses a solid lens 4. In summary, the lens 4 of the present invention and the light source device having the lens 4 form an uneven surface structure 42 J by forming the top surface 42 of the lens 4, for example, forming a plurality of convex surfaces extending in a stepwise manner and arranged in concentric circles. In the slave 422, when the light emitted from the light-emitting semiconductor element 3 enters the top surface, part of the light is deflected by the uneven surface structure 421 and does not travel directly above the top surface 42; therefore, the normal line from the light exiting from 423 The light intensity in the direction where the angle 0 is equal to the twist is lowered, so that the light intensity increases when the light exit angle (the angle 0) is approximately equal to the positive and negative 45 degrees, so that the light intensity distribution is obtained on the light exit surface 423. A uniform light field provides uniform illumination, so that the object of the present invention can be achieved. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All still 12 1360666 is within the scope of the patent of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a polar plot of light intensity, illustrating a conventional light-emitting diode as a light source when illuminated; FIG. 2 is a side cross-sectional view showing the lens of the present invention and a light source device having the same 3 is a top view showing the lens of the preferred embodiment; FIG. 4 is a schematic view showing the convex section of the lens of the preferred embodiment. FIG. 5 is a right angle coordinate diagram of light intensity, illustrating The light intensity of the light exiting the lens in each light-emitting direction of the preferred embodiment; FIG. 6 is a polar plot of the light intensity, illustrating that the light intensity distribution of the light exiting the lens of the preferred embodiment is substantially uniform on the light-emitting surface; Figure 7 is a flow chart illustrating the manufacturing method of the preferred embodiment; Figure 8 is a schematic view showing the mold of the manufacturing method of the preferred embodiment; Figure 9 is a flow chart showing another embodiment of the preferred embodiment FIG. 10 is a side elevational cross-sectional view showing the lens cover of the manufacturing method of the preferred embodiment; FIG. 11 is a flow chart showing another manufacturing method of the preferred embodiment f 0 Figure ' It is to be noted that the top surface depression of the preferred embodiment has an arc-shaped outline with an opening upward; 13 1360666 FIG. 13 is a schematic view showing the top surface of the preferred embodiment having a concave shape and an open shape. And FIG. 14 is a schematic view showing the top surface of the preferred embodiment having a bowl-shaped outline with a tapered shape at the bottom. 14 1360666 [Description of main component symbols] 19.........central axis 200 .......light source device 2 .......... pedestal 3 ...... ...light emitting semiconductor component 4 .......... lens 41 ... ... bottom surface 42 ... ... top surface

53.........room 61~66 - step 7 ..... mold 71 ......... top wall 72 ........ Side wall 73 ......... cavity 81~85·...Steps 91~93....Step A..........Angle angle D1 ........ Diameter D2. .......diameter Η..........height 42, 42, 42, 43,, ', ............ top Φ 421 .... ...uneven surface structure 422 ....... convex section 423 .......light surface 43.........{face hi... Distance 5 ..........Lens cover 夹 Angle 51 ......... top wall

52 ......... sidewall 15

Claims (1)

1360666 Replacement page of patent application No. 96132213 (Revised: 100 9) Year 0 0·9. 2 replacement page-outline-,-, patent application scope: A lens for receiving a light-emitting semiconductor component. The lens comprises: a bottom surface facing the light-emitting semiconductor component to receive light; a top surface Conversely to the bottom surface, the top surface includes an uneven surface structure that deflects a portion of the light passing through the bottom surface and incident on the top surface without traveling directly above the top surface; and a side surface from the top surface The periphery extends toward the periphery of the bottom surface, and the light passing through the bottom surface and incident on the side surface emits the lens; the lens shape is gradually increased from the boundary between the top surface and the side surface toward the bottom surface, and the projection of the upper portion of the lens is It falls within the range of the lower cross section of the lens; the light passing through another portion of the bottom surface is emitted from the side. 2. The lens of claim 1, wherein the topping comprises a plurality of convex sections forming the surface structure, the convex sections extending continuously in a stepped manner. 3. The lens of claim 2, wherein the convex segments are arranged in concentric circles. The lens according to any one of claims 1 to 3, wherein the definition of a central axis passing through the lens is a concave surface which is recessed toward the center. 5. The lens of claim 4, wherein the top surface depression is generally V-shaped in a longitudinal section of the lens along the central axis. 6. The lens of claim 4, wherein in the longitudinal section of the central axis of the lens g, the top surface depression is open upwards. The lens according to claim 4, wherein in the longitudinal section of the lens along the central axis of the s-Xuan, the top surface depression has a bowl shape with a tapered shape at the bottom. 9. The lens of claim 5, wherein the side surface is a curved surface. 10. The lens of claim 5, wherein the side is a portion of a sphere. 11. The lens of claim 5, wherein the bottom surface is parallel to a light exiting surface formed by the periphery of the top surface. 12. A light source device having a lens, comprising: a susceptor; an illuminating semiconductor component disposed on the pedestal; and a lens disposed on the pedestal for receiving light emitted by the illuminating semiconductor component The lens includes: a bottom surface 'facing the light emitting semiconductor component to receive light; a top surface opposite to the bottom surface, the top surface including a portion of the light passing through the bottom surface and incident on the top surface An uneven surface structure traveling directly above the top surface; and a side surface extending from the periphery of the top surface toward the periphery of the bottom surface, the light passing through the bottom surface and incident on the side surface exits the lens; the lens outer 17 1360666 Replacement page of patent application No. 96143213 {correction date error ^邠〇«Λ J_ - -{0〇〇9.14> u stop · 朁涣 page shape from the top surface and the side junction to the bottom side of the lens upper part The projection of the cross section falls within the range of the lower cross section of the lens. Light rays passing through another portion of the bottom surface are emitted from the side surface. 13. The light source device of claim 12, wherein the base is an upright bracket, a planar bracket or a piranha bracket. 14. The light source device of claim 12, wherein the top surface of the base is in contact with the bottom surface of the lens. 15. The light source device of claim 2, wherein the top surface comprises a plurality of convex segments forming the surface structure, the convex segments extending continuously in a stepped manner. 16. The light source device of claim 15, wherein the convex segments are arranged in concentric circles. 17. The light source device 'wherein' according to any one of claims 2 to 16 defines a central axis passing through the lens, the top surface being a concave surface which is recessed toward the center. 18. The light source device of claim 17, wherein the top surface depression is V-shaped in a longitudinal section of the lens along the central axis. The light source device according to claim 17, wherein in the longitudinal section of the lens along the central axis, the top surface depression has an arc shape with an opening facing upward. The light source device of claim 17, wherein the top surface of the lens has a flared opening in a longitudinal section of the lens along the central axis. 21. The light source device according to the πth aspect of the patent application, wherein the replacement page of the patent application specification of the Japanese Patent Application No. 96132236 The light source device according to claim 18, wherein the side surface is a longitudinally-shaped section of the upper-replacement lens along the central axis, the top surface is concavely shaped by a cone-shaped bowl. A light source device according to claim 18, wherein the side t-plane is a part of a spherical surface. The light source device according to claim 18, wherein the bottom surface Parallel to a light exit surface formed by the periphery of the top surface. 19