TW200920709A - Near-infrared absorbing filter and image sensor package - Google Patents

Abstract

Disclosed is an near-infrared absorbing filter having an optical substrate formed by melting a raw material composition including 40 to 75 wt% of P2O5, 10 to 28 wt% of Al2O3 and 3 to 8.5 wt% of CuO and cooling the raw material composition that has been melted. P2O5 and Al2O3 together constitute at least 70 wt% of the raw material composition. The present invention further provides an image sensor package using the near-infrared absorbing filter.

Description

200920709 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an absorption-infrared absorbing filter. [Prior Art]

The optical sensitivity of image sensing components (such as CMOS image sensing wafers or CCD image sensing wafers) used in digital imaging products such as digital cameras and image modules in cameras ranges from visible light to near infrared light. , 1〇〇nm). Therefore, a glazing glass that absorbs near-infrared rays is generally used to obtain a color image that is sensitive to human visible light sensitivity. In addition, since digital imaging products (such as automotive imaging systems) may be used in extremely harsh environments, image-sensing crying package construction must be tested in extremely harsh high-temperature and high-humidity environments; 85; 3c: /85% rh 500-hour continuous test . The traditional image sensor package structure uses the package glass to filter out the function of 70〇nm~ll〇〇nm near-infrared, so it must be installed in the lens module: a reflective near-infrared filter 'light-glass' Effectively block infrared rays and avoid image color shift, heat generation and noise. Figure i shows a conventional image sensor package structure (10) comprising a substrate 110, an image sensor 120, a lens module (four), a housing (Housing) 140, and a transparent package. . The device 120 is electrically connected to the substrate by means of wire bonding. The lens module 13G is provided with a lens 132 Μ reflective near-infrared filter glass <

P070038-TW 5 200920709 134. FIG. 2 shows another conventional image sensor package structure 200, which includes a substrate 210, an image sensing component 220, a lens module provided with a lens 232 and a reflective near-infrared filter glass 234. , a housing (not shown) and a transparent package glass 250. The image sensing element 220 is electrically connected to the substrate 210 by wire bonding. With the trend of digital cameras and cameras in recent years, the image sensor package structure needs to be reduced in height (Z-height). When the module is shorter, the incident angle of the light source is relatively larger. When the light source is incident angle 0°~30 ° °, the central wavelength shift must be less than 5 nm 'to avoid the image sensor beyond its white balance limit, and produce a serious color shift phenomenon, this optical requirement has exceeded the physical limit of the conventional reflective filter glass. In addition, the reflective near-infrared filter glass is prone to image fatigue in the light army and multiple imaging (ghost) images. As noted above, the devices currently in use have significant disadvantages and/or limitations. Therefore, the prior art used in this field remains to be improved. SUMMARY OF THE INVENTION An object of the present invention is to provide an absorption type near-infrared filter glass which is resistant to harsh high temperature and high humidity environments. Another object of the present invention is to provide an absorption type near-infrared filter glass which can be used in an image sensing package structure instead of a reflective near-infrared filter glass. The absorption near-infrared filter glass of the present invention has a glass substrate,

P070038-TW 6 200920709 is formed by melting a raw material composition and cooling the melted raw material composition. The raw material composition mainly contains 40 to 75% of P205, 10 to 28% of Al2〇3 and 3~8. 5% of C11, wherein both P205 and Al2〇3 account for more than 70% of the raw material composition. % by weight of the invention means percentage by weight. The glass frit composition of the present invention may further comprise 0 to 5% of B2?3 to enhance glass stability and chemical resistance. Further, the glass raw material composition of the present invention may further contain Si〇2, MgO, CaO, K20, BaO, U2〇'Nb2〇5 or ZnO in a total content of U0%, which is meltable and devitrified for sintering. Improvement is very effective. Under the thickness limitation of 0.4~0.2mm, the absorption rate of the absorption near-infrared filter of the present invention can reach 80~90% or more at a wavelength of 4〇〇~500nm or more. The center wavelength (the transmittance is 50%). It can control any band between 600 nm and 650 nm, and the average transmittance of 75 〇 nm to llOO nm is 3%. The absorption type near-infrared filter glass of the present invention may have an anti-reflection film layer disposed on the glass substrate if required for optical design. The absorption type near-infrared filter glass of the invention has good weather resistance and passes through 85. 5 After 5 (9) hours of constant temperature and humidity testing, there is no rough saccharification and chemical treatment on the surface. In addition, when the incident angle of the light source V. tianyou is up to 30, the near-infrared filter of the present invention can accurately control the color image of the image sensing component which is less than 5_', and thus is not distorted. . Therefore, the source of the absorption is stabilized. Therefore, the absorption type near-red measuring package structure of the present invention replaces (4) the red light filtering filter. The image sensing will be described in detail below with reference to the drawings. Understand this issue

P070038-TW 7 200920709 All of the aforementioned operating principles and advantages. [Embodiment] The absorption type near-infrared ray filter of the present invention is formed by melting a raw material composition and cooling a tantalum-destroying base material, and the raw material composition is mainly composed of a raw material composition of Al2. 〇3 and 3 to 8.5% of Cu 〇, wherein = 2% of p2 〇 5, 10 to 28% of the raw material composition is 70% or more. Both of the present invention 25 and Al2〇3 account for a ratio of the composition and content of the raw material composition. The essential component 'is the main ingredient of infrared absorption, and the pound fL will not be able to achieve good absorption. 2. The outside of the work, the spring, so the lower limit of p2〇5 is 40%, preferably for you. If P2〇5 exceeds 75%, the process of smear in the sputum will be because the viscosity exceeds the upper limit. It is better to say “difficult problems occur, because the durability (weatherability) is very effective. If the composition is 'unregulated, #r~ is present, if it exceeds 28%, the problem of melting difficulty and devitrification will occur. Therefore, the lower limit is 〇%, preferably 13%, upper limit=28%,|read as 2()%. ? The total content of both 2〇5 and 〇3 is 7〇% or more ’, and a filter with high transmittance and good near red fruit can be obtained.

CuO is very good for blocking near-infrared rays, but if the content is 3% (preferably not lower than 5%), the barrier effect is very low, but if it exceeds 8.5/. (preferably not more than 7%) will cause the penetration of visible light to be low

The problem with P070Q3S-TW 8 200920709 is generated. The design of modern image modules tends to be lighter and lighter, reducing the thickness of the filter glass. The inventor of the present invention 35, therefore, preferably, when the glass thickness is limited to 0.55 mm to 0 1 column, it is found that the taste mouth is Γ 曰 曰 · · · 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳There is CuO containing 1 between 3% and 8,5%, and does not pass to have good penetration (400~500nm transmittance 40~90% or more) and absorption (750nm~1100_ average penetration rate <; 3%) · The light glass. The glass raw material composition of the present invention may further comprise 〇~5% of B2〇3. ΙΑ The glassiness and chemical purity can be enhanced, and it can be found in the filter glass of the present invention. The glass raw material composition of the present invention may further contain Si 〇 2, Mg 〇 ' Ca 〇, κ 20, BaO, Li 20 , 灿 205 or Zn 0 , which is effective for improving the meltability at the time of sintering and the deterioration of devitrification. If the total content of the above oxide is less than 1%, the effect of improving melt solubility and devitrification is not good, but if the total content exceeds 20 Wt ° / 〇, the durability is deteriorated and the transmittance is also lowered. In addition, in order to obtain better meltability and improvement in devitrification without affecting its durability and preventing deterioration of penetration, p2〇5, Al2〇3,

The total content of Si02, MgO, CaO, K20, BaO, Li20, Nb205 and Zn0 is at least 85%, preferably 90% or more. It can be understood that the raw materials of the water-soluble, carbonate, nitrate, acidate and the like form the above-mentioned glass raw material composition, but in terms of impurities, in order not to affect the visible light transmittance of 400 nm to 600 nm, it is preferable. The glass is produced using a raw material having an iron content of less than 0.02%.

P070038-TW 9 200920709 The absorption type near-infrared filter glass of the present invention has an anti-reflection film layer disposed on the glass substrate to reduce the reflectance of the substrate itself to a minimum. Effectively control the maximum penetration of visible light. The absorption type near-infrared filter glass of the invention has stable low reflectivity characteristics, and the average value of 400 nm to 680 nm is less than 0.3%, the absolute value is not more than 0.8%, the average value of 680 nm to 700 nm is less than 2%, and the absolute value is not more than 3%. It can effectively improve the phenomenon of halo and secondary development (ghosting) and improve image quality by using image sensing package structure and its application products. The antireflection film layer suitable for use in the present invention may be a single transparent metal oxide film layer (for example, Nb205 (refractive index 2.375) or SiO 2 (refractive index 1.48)), or a multilayer antireflective metal oxide film layer (generally in a high vacuum). The environment is obtained by using two kinds of high-purity metals (such as Nb and Si) to form a complete oxide film by ion plating and stacking on a substrate. The absorption near-infrared filter glass of the present invention can be used as a reflective near-infrared filter glass for image sensing package construction. 3 is an image sensor package structure 300 according to an embodiment of the invention, which mainly includes a substrate 110, an image sensing component 120, a lens module 310 with a lens 132, and a housing (Housing). And an absorption type near infrared ray filter glass 320. The image sensing device 120 is electrically connected to the substrate 110 by wire bonding. The outer casing 140 is adhered to the substrate 120 for engaging the lens module 310 and carrying the absorption near-infrared filter glass 320. When the light passes through the lens 132 and the filter glass 320 and is incident on the image sensing component 120, the image sensing component 120 converts the light into an electrical signal.

P070038-TW 10 200920709 Figure 4 shows the lens according to the material-implementation of the embodiment, which mainly includes the substrate 21〇, an image sensor, and a lens module with a transparent (4), — =, - ...: Near-infrared light breaks according to light. The image sensor is electrically connected to the substrate by a wire bonding method. The absorption type near-infrared light-passing glass 320 can be adhered to the crystal image sensing element (4) by a sealing agent. on. The second: in: broken agent. It can be understood that the heat of the present invention can be replaced by the conventional light-reflecting glass, so that the height of the low-package structure can be greatly improved (four) transparent embodiment to prepare an absorption near-infrared filter. The glass is made of P205, Al2〇3, B2〇3, Si〇2, Mg〇, (10) U2〇, Zn〇, Cu0 and ·, respectively, to obtain the raw material composition of the percentage component of Bao. The weight I 6 of the individual raw materials is dissolved in the 丨〇 升 〇 〇 挂 以 以 以 12 12 12 12 12 12 12 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解 溶解〇: After 'refine the hour, then inject the specified stone black φ. After 10 times of temperature control, Luzhong lowered the temperature to normal temperature to avoid the production of the surface of the glass substrate with a thickness of 0.3 mm and the surface of the substrate. The original substrate of the disk, T, and slab 2 is plated with an anti-reflection film layer to prepare individual /, table -). The money of the glass is near: the outer filter glass

P070038-TW 200920709 The glass sample 'is visually observed as blue'. The spectrum measured by the spectrometer is shown in Fig. 1 'The transmittance of all filter glass samples at 400 nm (T), center wavelength (T50%) And the light absorption peaks (peak) are listed in Table 4. Table 1 No. 1 2 3 4 5 6 P2〇5 73.0% 73.75% 72.89% 67.4% 59.17% 55.8% A1203 17.4% 10.68% 14.9% 12.5% 26.63% 24.8% B203 0.5% Si〇2 2.9% 2.96% 4.3% MgO 0.4% 2.03% 1.49% 1.9% 1.42% 3.1% CaO 2.0% 0.79% 1.78% 1.5% κ2ο 6.1% 4.8% 2.37% 6.2% BaO 3.4% Li20 5.96% ZnO 1.0% 0.51% 1.4% CuO 5.6% 3.87% 3.97% 4.1% 5.68% 4.3% Nb205 3.05% 1.4% Table II Chemical Properties Thermal Properties Mechanical Properties Other Da τ Ag Ts 30α70 100α300 Ηκ Fa S Grade 1 Grade 1 550 615 99xl〇~7/°C 119χ1(Γ7/.. 560 130 2.75

Dw means water resistance; DA means acid resistance; Tg means conversion temperature; Ts means soft

P070038-TW 12 200920709 Chemical temperature; 30α70 means the coefficient of linear thermal expansion from 30 °C to 70 °C; W0a300 means 1〇〇. 〇 to 300 °C average linear expansion coefficient; HK means Knoop hardness; FA is the Abrasion factor; S is the specific gravity. Table 3 (refractive index (nd) and Abbe number (vd)) ihg F' F ed DC, c ληιη 365 404.7 435.8 480 486.1 546.1 587.6 589.3 643.8 656.3 η 1.559 1.552 1.547 1.543 1.542 1.538 1.536 1.536 1.534 1.533 nd-1 vd =- = 60 Abbe's number (vd) is used to measure the degree of light dispersion of the sample nF-nc / Table 4 number 1 2 3 4 5 6 400nm T=80% T-86% T=86% T=85% T =83% T=86% T50% 630 nm 650 nm 648 nm 645 nm 640 nm 653 nm Peak 510 nm 500 nm 502 nm 500 nm 504 nm 503 nm As shown in Fig. 5 and Table 4, the absorption near infrared ray of the present invention The filter glass (thickness 0.3mm) has a transmittance of 80~90〇/〇 at a wavelength of 400~5〇〇nm. The center wavelength (T50%) can be controlled in any band between 600nm and 650nm, and 750nm. ~llOOnrn average penetration rate < 3%. In addition, after 500 hours of continuous testing using a constant temperature and humidity machine using the specified temperature and humidity (85 ° C 85% RH), the surface of all the absorption-type near-infrared filter glass samples was free from roughening and fogging. Although the invention has been described in detail in its particular preferred version, other

The version of PO70038-TW 13 200920709 f is still possible. Therefore, the scope of the patent application is not limited to the preferred version described herein.

P070038-TW 14 200920709 [Simplified Schematic] FIG. 1 is a cross-sectional view showing a conventional image sensor package structure. FIG. 2 is a partial cross-sectional view showing another conventional image sensor package structure. Figure 3 is a cross-sectional view showing an image sensor package structure in accordance with an embodiment of the present invention. Fig. 4 is a partial cross-sectional view showing the structure of an image sensor package according to another embodiment of the present invention. Figure 5 is a transmission spectrum of a filter glass sample measured using a spectrometer. Main component symbol description 100 image sensor package structure 110 substrate 120 image sensing element 130 lens module 132 lens 134 reflective near infrared ray glass 140 housing 150 transparent package glass 200 image sensor package structure 210 substrate 220 image sense Measuring element 230 lens module 232 lens 234 reflective near-infrared filter glass 250 transparent package glass 300 image sensor package structure 310 lens module 320 absorption near-infrared filter glass

P070038-TW 15

Claims (1)

200920709 X. Patent application scope: ^ * and the collection type near-infrared filter glass, which comprises at least one glass substrate. The glass substrate is formed by smelting a raw material composition and cooling the molten raw material composition. The raw material composition comprises 40 to 75% of P 2 O 5 ' 10 28% of Al 2 〇 3 and 3 to 8 5% of Cu 〇, wherein % means weight % ' and both ( 9 ) 5 and Al 2 〇 3 account for the raw material composition More than 70%. The invention relates to an absorption type near-infrared filter glass bottle according to claim 1, wherein the raw material composition further comprises: 〇~5% of b2〇3; and SiO2, Mg〇, CaO, K2〇, BaO Li2〇, Nb205, and ZnO, and the selected species or two or more oxides of the group, the total content of the seed or the two or more oxides, wherein the maximum is 8%. 3. For the absorption of near-infrared filtering (5) /, P2〇5, Al2〇3 'Si〇2, MgO, CaO, K20, BaO, 2, 205 and Zn〇 as described in Section 2. The total content is 85% of the composition of the raw material. 4. The absorption type near-infrared ray, as described in the article, the thickness of the filter glass is from about 0.1 mm to about 0.55 mm. For example, the absorption type near-infrared rays described in the application of the 帛 帛 i item; the light filter, wherein the filter glass has a thickness of about 0. 2 mm to about 〇. 4 mm. The absorption type near-infrared ray filter glass according to claim 1, wherein the raw material composition contains 45 to 70% of Ρ2〇5. 7. The absorption type near-infrared ray filter glass according to claim 1, wherein the raw material composition contains 13 to 20% of Al2?3. 8. The absorption type near-infrared filter glass as described in claim 1 wherein the raw material composition comprises Cu0 of 35 to 7 Å/〇. 9. The absorbing near-infrared ray filter glass of claim 1, further comprising an anti-reflection film layer disposed on the glass substrate. 10· image sensing package structure, comprising at least: a substrate; a shirt image sensing component electrically connected to the substrate; a lens module; and two absorption near infrared filter glass, the at least one The glass substrate, the =% substrate is formed by melting the raw material composition and cooling the melted V^ composition, and the raw material composition comprises 仞~%% of ha, 10~283⁄4 of Al2〇3 and 3 to § 50 / 夕 ^ , , 0 ^ , · 5 / ο CuO, where % means weight percent ' and both (10) and A are more than the view of the raw material composition. 11. The image sensing package described in claim 10, wherein the raw material composition further comprises: 0 to 5% of B2〇3; and by SiO2, MgO, CaO, K20 , Ba0, Li2〇, Na2〇5, and Zn〇: one selected from the group consisting of “heavier or more oxides, and the total content of the two or more oxides of the species or lanthanum is 丨~such as %, where The image sensing package structure '乂2〇5, Al2〇3, Si〇2, MgO, Ca0, K2〇, Ba0, Li2〇, Nb2 5乂 and 所述2最多S Μ The inclusion of ZnO accounts for more than (10) of the composition of the raw material. The image sensing package described in the item is 0.1 mm to about 0.55 mm. 13. The thickness of the filter glass is about 1 mm as in the patent application. 14. If the image sensing package described in the application for patents is 10th, the thickness of the 5th filter glass is about 0 mm to about 0.4 mm. 1) wherein the raw material composition comprises 70% of P2〇5 of the image sensing package of 45~, 16. The raw material composition comprises 13 to 20% of Al2〇3 of the image sensing package of the above-mentioned item. 17·Absorption type near-infrared filter P070038-TW 18 200920709 The image sensing package structure according to claim 10, wherein the absorption near-infrared filter glass further comprises an anti-reflection film. The image sensing package structure according to the first aspect of the invention, wherein the absorption near-infrared filter glass is disposed on the image sensing element and the lens module Between the groups. P070038-TW 19