JP4954499B2 - Silicone resin lens for LED and manufacturing method thereof - Google Patents

Description

  The present invention relates to a silicone resin lens for an LED (light emitting diode) and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, lenses having various shapes are frequently used to collect or scatter LED light. In this case, a thermoplastic resin having good transparency is widely used for the LED lens. This type of lens can be easily manufactured by injection molding. The thermoplastic resin is manufactured by injection molding, and at this time, the resin melted at a high temperature is poured into a mold set at a low temperature to be cooled and solidified. For this reason, the target molding can be obtained with a constant shrinkage rate by setting the mold temperature.

  In recent years, however, lead-free solder has often been used when mounting an LED package having this type of lens on a substrate. As a result, since the mounting temperature is set to a high temperature of 260 ° C., the conventional lens made of thermoplastic resin has a problem that the lens is deformed or yellowed during reflow.

  It is also known that when a blue LED is used as the LED element, yellowing or deterioration occurs in a lens made of a thermoplastic resin.

  For this reason, it has been proposed to manufacture a lens using a silicone resin excellent in ultraviolet resistance and heat resistance. However, since a silicone resin is a thermosetting resin, unlike a thermoplastic resin, the resin is injected into a mold heated to a high temperature to be solidified. In addition, the thermosetting silicone resin composition for obtaining the silicone resin is usually post-cured for several hours at the molding temperature or higher temperature in order to further promote the curing reaction after molding. As a result, since the shrinkage varies depending on the normal molding conditions and post-cure conditions, the dimensions of the molded product differ, making it very difficult to obtain a precise lens having the designed dimensions.

In addition, the following literature is mentioned as a prior art relevant to this invention.
JP 2000-23002 A JP 2000-17176 A JP 2004-221308 A

  This invention is made | formed in view of the said situation, and it aims at providing the silicone resin lens for LED which was excellent in the extraction efficiency of light, and was excellent in the precision of a dimension, and its manufacturing method.

  As a result of intensive studies to achieve the above object, the present inventors have studied in detail the relationship between the molding conditions of the silicone resin composition and the molding shrinkage rate, and if specific conditions are set, post molding and post It has been found that the ratio of mold shrinkage after curing can be controlled within 10%. In addition, the refractive index of the cured product is very important in order to efficiently extract the light emitted from the device to the outside of the package. In particular, blue LEDs and ultraviolet rays are used for the refractive index of a cured silicone resin near 596 nm. It was found that a silicone resin lens having a refractive index at 400 nm, which is close to the wavelength of light emitted by an LED, is 1.01 or more times higher than the refractive index of 596 nm can efficiently extract light, and completed the present invention. is there.

Accordingly, the present invention provides (A) the following formula:
(In the above formula, k and m are positive integers and are integers satisfying 10 ≦ k + m ≦ 2,000 and 0 <k / (k + m) ≦ 0.5.)
A linear organopolysiloxane selected from
Or the following formula: (R ¹ SiO _3/2 ) _d (R ¹ ₂ SiO) _e (R ¹ ₃ SiO _1/2 ) _f
(In the above formula, each R ¹ is selected from the same or different vinyl group, phenyl group, methyl group, ethyl group, and propyl group, and 2.0 to 45.0 mol% of R ¹ is vinyl group, 25 to 60 The mol% is a phenyl group, and d / (d + e + f) = 0.65 to 0.95, e / (d + e + f) = 0.05 to 0.35, and f / (d + e + f) = 0 to 0.05. )
Vinyl group-containing organopolysiloxane having a three-dimensional structure represented by
(B) The following formula
An organohydrogenpolysiloxane selected from: an amount of 0.75 to 2.0 silicon-bonded hydrogen atoms per vinyl group in the component (A),
(C) Platinum-based catalyst: 1 to 1,000 ppm relative to component (A)
Formed and cured, the ratio of the refractive index measured at 400 nm and 596 nm is 1.012 to 1.026 , and the refractive index at 400 nm is 1.51 to 1.60. A silicone resin lens for a blue or ultraviolet LED is provided.
Further, the present invention is that the silicone resin composition is injection-molded and then post-cured so that the ratio of the molding shrinkage ratio after molding to the molding shrinkage ratio after post-cure is 0.9 to 1.1 and 400 nm. And obtaining a silicone resin lens for blue or ultraviolet LED comprising a silicone resin having a refractive index ratio of 1.012 to 1.026 and a refractive index of 400 nm of 1.51 to 1.60. The manufacturing method of the silicone resin lens for LED characterized by the above-mentioned is provided.

  The silicone resin lens for LED of the present invention has excellent light extraction efficiency and excellent dimensional accuracy. Moreover, according to the manufacturing method of the silicone resin lens for LED of this invention, this silicone resin lens for LED can be obtained.

In the silicone resin lens for LED of the present invention, the ratio of the refractive index R ₄₀₀ measured at a wavelength of 400 nm to the refractive index R ₅₉₆ measured at a wavelength of ₅₉₆ nm (R ₄₀₀ / R ₅₉₆ ) is 1.01 or more, preferably 1.012 or more. More preferably, it is 1.012 to 1.20, and a refractive index R _{400 of 400} nm is 1.50 or more, preferably 1.51 or more, more preferably 1.51 to 1.60. It has been done. Here, the value of the refractive index is a value when measured by the prism coupler method (Metricon) method at 25 ° C.

  In this case, the silicone resin is composed mainly of an aliphatic unsaturated group-containing linear organopolysiloxane or a silicone resin having a three-dimensional network structure, that is, a T unit (organosilsesquioxane unit). What was obtained by hardening | curing the organopolysiloxane (preferably the organopolysiloxane containing 65-95 mol% of T units) contained as a main structural unit is preferable.

  Moreover, as a hardening type of these silicone resins, what is shape | molded and hardened | cured using the silicone resin composition hardened | cured by hydrosilylation reaction (addition reaction) is preferable.

As this silicone resin composition,
(A) a linear organopolysiloxane having an aliphatic unsaturated group such as an alkenyl group,
(B) organohydrogenpolysiloxane,
(C) What mix | blended the platinum-type catalyst as an essential component is suitable.

  More specifically, the organopolysiloxane of component (A) is basically a straight-chain organoorganism in which the main chain is composed of repeating diorganosiloxane units and both ends of the molecular chain are blocked with triorganosiloxy groups. A polysiloxane having an aliphatic unsaturated bond represented by an alkenyl group having 2 to 8 carbon atoms, particularly 2 to 6 carbon atoms such as two or more vinyl groups and allyl groups in one molecule, and a viscosity of 25 ° C. 10 to 1,000,000 mPa · s, particularly 100 to 100,000 mPa · s, any of which can be used, and in particular, both ends of the molecular chain represented by the following general formula (1) A linear organopolysiloxane having at least one alkenyl group on each silicon atom, usually 1 to 3 alkenyl groups, and a viscosity at 25 ° C. of 10 to 1,000,000 mPa Those workability s, is desirable from the curability. The linear organopolysiloxane may contain a small amount of a branched structure (trifunctional siloxane unit) in the molecular chain.

Wherein R ¹¹ is the same or different unsubstituted or substituted monovalent hydrocarbon group, and R ¹² is the same or different unsubstituted or unsaturated monovalent hydrocarbon group. And k and m are 0 or a positive integer, and k + m is a number that makes the viscosity of this organopolysiloxane at 25 ° C. 10 to 1,000,000 mPa · s.)

Here, the monovalent hydrocarbon group for R ¹¹ is preferably a group having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms, and specifically includes a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group. Group, tert-butyl group, phenyl group, tolyl group, xylyl group, naphthyl group and other aryl groups, benzyl group, phenylethyl group, phenylpropyl group and other aralkyl groups, vinyl group, aryl group, propenyl group, isopropenyl group Alkenyl groups such as those described above, or those in which some or all of the hydrogen atoms of these groups are substituted with halogen atoms such as fluorine, bromine, chlorine, cyano groups, etc., such as chloromethyl group, chloropropyl group, bromoethyl group, trifluoro Examples include halogen-substituted alkyl groups such as propyl group and cyanoethyl groups.

Also, the monovalent hydrocarbon group for R ¹² is preferably one having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms, and the same examples as the specific examples for R ¹¹ can be exemplified, but an alkenyl group is not included.

  k and m are generally 0 or a positive integer satisfying 5 ≦ k + m ≦ 10,000, preferably 10 ≦ k + m ≦ 2,000, and 0 <k / (k + m) ≦ 0.5. A satisfying integer.

Specific examples of the organopolysiloxane of the above formula (1) include the following.

(In the above formula, k and m are as described above.)

Further, as the vinyl group-containing silicone resin as the component (A), it is possible to use a silicone resin having a three-dimensional structure other than the structure as described above as a main component. A) at least (R ¹ SiO _3/2 ) _d (R ¹ ₂ SiO) _e (R ¹ ₃ SiO _1/2 ) _f , each R ¹ being the same or different unsubstituted or substituted monovalent hydrocarbon group The total number of monovalent hydrocarbon groups is 2.0 to 45.0 mol%, particularly 5 to 40 mol% is a vinyl group. If the vinyl group is less than 2.0 mol%, there are few crosslinking points and the strength is insufficient, and if it exceeds 45.0 mol%, the cured product becomes brittle. And it is preferable that 25-60 mol%, especially 30-50 mol% is a phenyl group, d, e, and f show the molar ratio of each siloxane unit, d / (d + e + f) = 0.65-0.95. , E / (d + e + f) = 0.05 to 0.35, and f / (d + e + f) = 0 to 0.05.

As R ¹ , examples of groups other than vinyl group and phenyl group include those similar to R ¹¹ such as methyl group, ethyl group, propyl group and the like.

  Moreover, it is preferable that the polystyrene conversion weight average molecular weight by GPC of this organopolysiloxane is 1,000-200,000, especially 2,000-100,000.

The (B) component organohydrogenpolysiloxane acts as a cross-linking agent, and forms a cured product by the addition reaction between the SiH group in the component and the vinyl group of the (A) component. The organohydrogenpolysiloxane may be any one as long as it has two or more hydrogen atoms (that is, SiH groups) bonded to a silicon atom in one molecule. In particular, the following average composition formula (2)
H _a (R ² ) _b SiO _{(4-ab) / 2} (2)
Wherein R ² is the same or different unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated bond, and a and b are 0.001 ≦ a <2, 0.7 ≦ b ≦ 2 and 0.8 ≦ a + b ≦ 3.)
And having at least 2 (usually 2 to 500), preferably 3 or more (for example, about 3 to 300) hydrogen atoms bonded to silicon atoms in one molecule.

Here, R ² in the above formula (2) is the same or different unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, particularly 1 to 7 carbon atoms, which does not contain an aliphatic unsaturated bond. Preferably, examples include lower alkyl groups such as a methyl group, aryl groups such as a phenyl group, and those exemplified for the substituent R ¹¹ of the general formula (1) described above, except that an alkenyl group is not included. A and b are numbers satisfying 0.001 ≦ a <2, 0.7 ≦ b ≦ 2, and 0.8 ≦ a + b ≦ 3, preferably 0.05 ≦ a ≦ 1, 0.8 ≦ b ≦ 2 and 1 ≦ a + b ≦ 2.7. The position of the hydrogen atom bonded to the silicon atom is not particularly limited, and may be at the end of the molecule or in the middle.

Examples of the organohydrogenpolysiloxane include tris (dimethylhydrogensiloxy) methylsilane, tris (dimethylhydrogensiloxy) phenylsilane, 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetra. Methylcyclotetrasiloxane, both ends trimethylsiloxy-blocked methylhydrogenpolysiloxane, both ends trimethylsiloxy-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, both ends dimethylhydrogensiloxy-blocked dimethylpolysiloxane, both ends dimethylhydrosiloxane Gensiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane copolymer , Both terminals blocked with trimethylsiloxy groups methylhydrogensiloxane-diphenylsiloxane-dimethylsiloxane copolymers, copolymers consisting of (CH _{3) 2} HSiO _1/2 units and SiO _4/2 units, (CH _{3) 2} HSiO _Examples thereof include copolymers comprising _1/2 units, SiO _4/2 units, and (C ₆ H ₅ ) SiO _3/2 units.

Moreover, a compound as shown by the following structure can also be used.

  The molecular structure of the organohydrogenpolysiloxane may be any of linear, cyclic, branched, and three-dimensional network structures, but the number of silicon atoms in one molecule (or the degree of polymerization) is 3 to 1. , Especially about 3 to 300 can be used.

  In this organohydrogenpolysiloxane, an organic group bonded to a silicon atom is an alkyl group such as a methyl group, an ethyl group or a propyl group, an aromatic hydrocarbon group such as a phenyl group, and a halogen-substituted alkyl group thereof, or In the present invention, an organohydrogenpolysiloxane which is a halogen-substituted aromatic hydrocarbon group, but in which 5 to 40 mol% of all organic groups are aromatic hydrocarbon groups, is compatible with the component (A). Since it is excellent, it is preferable.

  The blending amount of the component (B) should be sufficient to give 0.75 to 2.0 silicon-bonded hydrogen atoms (SiH groups) per vinyl group in the component (A). Good.

  The curing catalyst as the component (C) is a platinum-based catalyst, and typical examples thereof include chloroplatinic acid and alcohol-modified chloroplatinic acid. The blending amount is a catalyst amount, and is usually used as a platinum atom in the range of 1 to 1,000 ppm, preferably 5 to 500 ppm relative to the component (A).

  A curable silicone resin composition can be obtained by sufficiently mixing the components (A), (B), and (C). In this case, the silicone resin obtained by curing this needs to have a refractive index at 400 nm of 1.50 or more, particularly 1.50 to 1.60. Therefore, the content of an aromatic group such as a phenyl group is preferably 30 mol% or more, particularly 30 to 80 mol% of the total organic groups of the components (A) and (B).

  The silicone resin composition of the present invention comprises the above-described components (A) to (C) as essential components, and various crosslinking agents, pigments, phosphors, release agents, and the like are added thereto as necessary. May be.

  The silicone resin lens can be produced by injection molding or transfer molding using a silicone resin composition containing the above-described vinyl group-containing organopolysiloxane as a main component and cured by a hydrosilylation reaction. When a molded product is manufactured by this type of molding method, the curing shrinkage rate of the molded product is affected by molding conditions, that is, molding temperature, molding pressure, and molding time. In addition, post-curing is usually performed in order to reliably exhibit the characteristics of the molded product after molding. Even after this step, the dimensions of the molded product change, and it is very difficult to obtain a molded product having a predetermined size. In particular, in the case of a silicone resin, since the expansion coefficient is larger than that of other resins, it is difficult to control a molding shrinkage rate to mold a molded product having a certain size, that is, a lens.

  The inventors of the present invention measured the molding shrinkage of the above-described silicone resin composition by molding a lens under various conditions using an injection molding apparatus.

Mold shrinkage was calculated by the following formula. In the following formula, room temperature is 25 ° C.
Mold shrinkage after molding = [(lens dimension in mold at room temperature−lens dimension after molding) / lens dimension in mold at room temperature] × 100
Mold shrinkage after post-curing = [(lens dimension in the mold at room temperature−lens dimension after post-curing) / lens dimension in the mold at room temperature] × 100

  As a result, as shown in FIG. 1, the molding shrinkage ratio after molding and the molding shrinkage ratio after post-curing differ greatly depending on the molding temperature, and the molding shrinkage ratio after molding and the post-curing temperature at a specific molding temperature. It has been found that there are points at which the molding shrinkage of the resin is almost the same. This relationship is related to the reactivity of the silicone resin composition, and in a composition having a high curing rate, the point at which the straight line of the molding shrinkage after molding and the straight line of the molding shrinkage after post-curing move to the low temperature side.

  Since the molding shrinkage rate is determined by the degree of cure of the molded product in the mold, the shrinkage rate can be reduced by increasing the molding time. However, even if the shrinkage rate decreases, the relationship between the molding shrinkage rate after molding and post-curing is similar. Therefore, increasing the molding time can reduce the shrinkage rate, but is not a desirable method because it causes a reduction in productivity.

  In the present invention, in order to produce a silicone resin lens with good dimensional accuracy, molding is performed under molding conditions in which the ratio of molding shrinkage after molding and post-curing is 0.9 to 1.1. A silicone resin lens with good dimensional accuracy can be manufactured by using a mold manufactured in consideration of the shrinkage ratio in advance and molding under the above-described molding conditions.

  That is, in the desired silicone resin composition, from the relationship between the molding shrinkage after molding at various molding temperatures and molding times and the molding shrinkage after post-curing at various post-curing temperatures and post-curing times, It is effective to obtain the condition that the ratio of the molding shrinkage after post-cure is 0.9 to 1.1 and perform molding under this condition.

  An existing injection molding apparatus can be used as the injection molding apparatus. Generally, a two-component type silicone resin composition is widely used. There is no problem as long as it is an injection molding apparatus equipped with a system capable of supplying a two-component liquid resin.

  In the case of injection molding, the molding temperature is 120 to 170 ° C., the injection pressure is 1 to 100 MPa, and the molding time is 0.5 to 20 minutes. Among them, it is desirable to mold at a temperature where the molding temperature is in the range of 140 to 170 ° C. and the shrinkage ratio is in the range of 0.9 to 1.1, because a lens having the desired dimensions can be manufactured.

  Moreover, as a post-cure condition, it can be about 1 to 4 hours at 100 degreeC or more.

  As described above, the LED silicone resin lens obtained by molding and curing into a predetermined shape in this way needs to have a refractive index ratio measured at 400 nm and 596 nm of 1.01 or more. In this case, in order to obtain such a refractive index ratio, it is effective to control the content of phenyl groups in the components (A) and (B) constituting the silicone resin.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example. In the following examples, the refractive index is a value at 25 ° C. by the prism coupler method (Metricon). The mold shrinkage was measured by the following method.
After molding shrinkage rate , the lens is removed from the mold, and after the temperature of the lens drops to room temperature (25 ° C), the dimensions of the lens are measured and post-cured at a temperature of 150 ° C or higher for 2-5 hours to further cure. Curing was performed, and after completion of post-curing, the respective shrinkage ratios were calculated by measuring the lens dimensions again. By calculating using these shrinkage rates, the molding shrinkage rates after molding and post-curing were obtained.

[Preparation Example 1]
1,057.7 parts by weight of phenyltrichlorosilane, 854.3 parts by weight of methyltrichlorosilane, 180.7 parts by weight of diphenyldichlorosilane, 402.9 parts by weight of methylvinyldichlorosilane, 216 parts by weight of isopropyl alcohol, toluene 1 The mixture consisting of 567 parts by mass was vigorously stirred in 6,535 parts by mass of water and added dropwise over 60 minutes. The mixture was further stirred for 60 minutes and then washed with water until neutrality. After washing with water, a toluene solution having a siloxane concentration of 25% by mass was added, 0.42 parts by mass of potassium hydroxide was added, and the mixture was heated to reflux for 5 hours for polymerization. Next, 13.8 parts by mass of trimethylchlorosilane was added and neutralized by stirring at room temperature for 60 minutes. After neutralization, the toluene was distilled off by filtration to obtain 1,110 parts by weight of a vinyl group-containing organopolysiloxane having a colorless and transparent three-dimensional network structure.

[Example 1]
100 parts by mass of organopolysiloxane synthesized in Preparation Example 1, the following formula

30 parts by mass of an organopolysiloxane having silicon-bonded hydrogen atoms and 0.1 part by mass of a chloroplatinic alcohol solution having a platinum content of 2% by mass as a catalyst are uniformly mixed, and injection molding for liquid silicone rubber A silicone resin lens having a predetermined shape was molded by molding for 3 minutes at 165 ° C. and an injection pressure of 10 MPa at the molding temperature described in Table 1 using an apparatus. The refractive index of the obtained lens was 1.52 measured at 596 nm, and the refractive index at 400 nm was 1.54. The refractive index ratio was 400 nm / 596 nm = 1.014.

  After molding, the dimensions of the molded product (n = 5) were measured, and the molding shrinkage rate (average value) after molding was calculated. The mold size for lens molding was 4.3 mm in diameter at room temperature (25 ° C.) shown in FIG.

  Further, after post-curing the lenses molded under different conditions (n = 5 in each condition) under post-cure conditions (150 ° C. for 4 hours), the dimensions were measured again at room temperature (25 ° C.), The mold shrinkage after post-cure was calculated.

  By molding at an injection pressure of 10 MPa and a molding temperature of 165 ° C., it is possible to manufacture a lens with good accuracy with little dimensional change after molding and post-cure.

[Example 2]
Following formula

(K = 69, m = 30)
100 parts by mass of a vinyl group-containing siloxane having a viscosity of 4,000 mPa · s, represented by the following formula

7 parts by mass of an organopolysiloxane having a silicon atom-bonded hydrogen atom and 0.1 parts by mass of a chloroplatinic alcohol solution having a platinum content of 2% by mass as a catalyst are uniformly mixed, and injection molding for liquid silicone rubber A silicone resin lens having a predetermined shape was molded by molding for 3 minutes at a molding temperature of 165 ° C. and an injection pressure of 10 MPa using an apparatus.

The refractive index of the obtained lens was 1.55 when measured at 596 nm, and the refractive index at 400 nm was 1.59. Refractive index ratio 400 nm / 596 nm = 1.02 was 6.

[Comparative Example 1]
Following formula

100 parts by mass of a vinyl group-containing organopolysiloxane having a viscosity of 5,000 mPa · s, represented by the following formula:

3 parts by mass of an organopolysiloxane having silicon-bonded hydrogen atoms represented by the formula (1) and 0.1 part by mass of a chloroplatinic acid alcohol solution having a platinum content of 2% by mass as a catalyst are uniformly mixed and injected for liquid silicone rubber. A silicone resin lens having a predetermined shape was molded by molding for 3 minutes at a molding temperature of 165 ° C. and an injection pressure of 10 MPa using a molding apparatus.

  The refractive index of the obtained lens was 1.41 measured at 596 nm, and the refractive index at 400 nm was 1.42. The refractive index ratio was 400 nm / 596 nm = 1.007.

[Example 3]
As shown in FIG. 3, the silicone resin lenses manufactured in Examples 1 and 2 and Comparative Example 1 were bonded with silicone rubber on a package on which a blue LED was mounted. Then, LED was made to light-emit and the light extraction efficiency was compared. As a result, the extraction efficiency of the LEDs with the lenses of Examples 1 and 2 improved by 15% compared to the LED with the lens of Comparative Example 1.

  In FIG. 3, 1 is a silicone resin lens, 2 is silicone rubber, 3 is a reflector, 4 is a gold wire, and 5 is an LED element.

It is a graph which shows the relationship between molding temperature, the shrinkage rate after shaping | molding, and the shrinkage rate after post-cure. It is the schematic which shows an example of the shape of a silicone resin lens. It is the schematic of the LED device used in the Example.

Explanation of symbols

1 Silicone resin lens 2 Silicone rubber 3 Reflector 4 Gold wire 5 LED element

Claims (2)

(A) The following formula
(In the above formula, k and m are positive integers and are integers satisfying 10 ≦ k + m ≦ 2,000 and 0 <k / (k + m) ≦ 0.5.)
A linear organopolysiloxane selected from
Or the following formula: (R ¹ SiO _3/2 ) _d (R ¹ ₂ SiO) _e (R ¹ ₃ SiO _1/2 ) _f
(In the above formula, each R ¹ is selected from the same or different vinyl group, phenyl group, methyl group, ethyl group, and propyl group, and 2.0 to 45.0 mol% of R ¹ is vinyl group, 25 to 60 The mol% is a phenyl group, and d / (d + e + f) = 0.65 to 0.95, e / (d + e + f) = 0.05 to 0.35, and f / (d + e + f) = 0 to 0.05. )
Vinyl group-containing organopolysiloxane having a three-dimensional structure represented by
(B) The following formula
An organohydrogenpolysiloxane selected from: an amount of 0.75 to 2.0 silicon-bonded hydrogen atoms per vinyl group in the component (A),
(C) Platinum-based catalyst: 1 to 1,000 ppm relative to component (A)
Formed and cured, the ratio of the refractive index measured at 400 nm and 596 nm is 1.012 to 1.026 , and the refractive index at 400 nm is 1.51 to 1.60. A silicone resin lens for blue or ultraviolet LEDs, characterized by comprising a silicone resin. The silicone resin composition according to claim 1 is injection-molded and then post-cured so that the ratio of the molding shrinkage after molding to the molding shrinkage after post-cure is 0.9 to 1.1, and 400 nm and 596 nm. A silicone resin lens for a blue or ultraviolet LED comprising a silicone resin having a refractive index ratio of 1.012 to 1.026 and a refractive index of 400 nm of 1.51 to 1.60 is obtained. The manufacturing method of the silicone resin lens for LED.