WO2004075289A1 - 半導体パッケージ用カバーガラス及びその製造方法 - Google Patents
半導体パッケージ用カバーガラス及びその製造方法 Download PDFInfo
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- WO2004075289A1 WO2004075289A1 PCT/JP2004/001659 JP2004001659W WO2004075289A1 WO 2004075289 A1 WO2004075289 A1 WO 2004075289A1 JP 2004001659 W JP2004001659 W JP 2004001659W WO 2004075289 A1 WO2004075289 A1 WO 2004075289A1
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- glass
- cover glass
- semiconductor package
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 70
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 238000007500 overflow downdraw method Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 6
- 239000002585 base Substances 0.000 claims 1
- 229910052738 indium Inorganic materials 0.000 claims 1
- 238000005498 polishing Methods 0.000 description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 14
- 239000005357 flat glass Substances 0.000 description 12
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- 230000007423 decrease Effects 0.000 description 9
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- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 4
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0203—Containers; Encapsulations, e.g. encapsulation of photodiodes
Definitions
- the present invention is mounted on a front surface of a semiconductor package containing a solid-state imaging device and a laser diode to protect the solid-state imaging device and the laser diode and to provide a transparent window.
- the present invention relates to a cover glass for a semiconductor package to be used and a manufacturing method thereof.
- a cover glass having a flat light-transmitting surface is provided to protect the semiconductor device.
- This cover glass is sealed to a package made of a ceramic material such as alumina, a metal material, or a resin material using an adhesive made of various organic lusters or low-melting glass. It not only retains the stored solid-state imaging device but also functions as a transparent window for visible light and the like.
- optical semiconductors that are frequently used at present include a CCD (Charge Coupled Device) and a CMOS (Complete Me ntaRayMet a1 O i d e Sem i c ondu c tor).
- CCDs were mainly mounted on video cameras to capture high-definition images, but in recent years, the use of image data processing has accelerated, and the range of use has rapidly expanded.
- digital still cameras are installed in mobile phones and are increasingly being used to convert high-definition images into electronic information data.
- CMOS is also called a complementary metal oxide semiconductor, and can be made smaller than CCD, consumes about one-fifth of the power, and can use the manufacturing process of microprocessors.
- advantages such as low capital expenditure for capital investment and inexpensive manufacturing, and it is increasingly being installed in image input devices such as mobile phones and small personal computers.
- CCD and CMOS require accurate conversion of images into electronic information.
- Strict standards are set for the surface of the cover glass to be used for the attachment of dirt, scratches, and foreign substances, and high-quality cleanliness is required. In addition to the cleanliness of the surface, it is also required that no bubbles, striae, crystals, etc. exist inside the glass, and that contamination of foreign substances such as platinum be prevented. In addition, it is required to have a thermal expansion coefficient close to that of the package material in order to seal well with various packages. In addition, this type of glass is required to have excellent weather resistance so that the surface quality does not deteriorate over a long period of time, and to have a low density so that the weight can be reduced.
- Patent Literatures 1 to 3 below propose a cover glass for a solid-state imaging device package in which radioactive isotopes are reduced and ⁇ -ray emission is reduced.
- Patent Literature 1 Japanese Patent No. 26660891
- Patent Document 2 Japanese Patent Laid-Open Publication No. Hei 6—2 11 15 39
- Patent Document 3 Japanese Patent Application Laid-Open No. Hei 7-2125703
- the amount of cover glass used for solid-state image sensor packages is increasing rapidly due to the expansion of applications and the development of use of image data.
- the conventional cover glass for a solid-state imaging device package is manufactured by the following method, the surface quality is poor and it is not suitable for mass production.
- a glass material is melted in a melting tank, defoaming is performed, and then homogenization is performed. Then, the glass melt is put into a mold and poured. It is formed or the glass melt is continuously drawn out on a plate and formed into a predetermined shape.
- the obtained glass molded body (glass ingot) is gradually cooled, cut into a certain thickness, and then polished on its surface to form a large plate glass having a predetermined thickness.
- the light transmitting surface of the cover glass for the solid-state imaging device package is polished on both surfaces, but by being polished, an infinite number of fine irregularities (micro scratches) S are formed on the surface.
- solid-state imaging devices have become increasingly more pixelated and smaller, and the light receiving surface per device tends to decrease accordingly. It is feared that incident light is easily scattered by the minute unevenness formed by this, and the amount of light received by some elements becomes insufficient, resulting in malfunction of the elements.
- this precision polishing is performed by a rotary polishing machine equipped with artificial leather, while automatically supplying a slurry in which free abrasive grains such as cerium oxide are dispersed in water or the like. It may penetrate the leather and form a projection on part of the artificial leather. The projections of the artificial leather formed by the glass powder scrape the surface of the cover glass at the time of polishing, causing a partial groove to be formed.
- the present invention has been made in view of the above circumstances, and has as its technical object to solve various problems associated with polishing by smoothing the light-transmitting surface of a cover glass for a semiconductor package without polishing. .
- the semiconductor package power bar glass of the present invention made in order to solve the technical problems of 3 ⁇ 4 above, light-transmitting surface is unpolished surface, the surface roughness (Ra) is less than 1. O nm Features.
- “Ra” is the arithmetic mean roughness defined in JIS B0601-1994.
- the power bar glass for a semiconductor package of the present invention is formed by a dangling method or a float method, and has a surface roughness (Ra) of a light transmitting surface of 1. Onm or less.
- the cover glass for a semiconductor package of the present invention has a mass percentage of Si 0 2 52 to 70%, Al 2 O 3 5 to 20%, B 2 0 3 5 to 20%, and alkaline earth metal oxide.
- Thing 4 ⁇ 30 ° /. , ZnO containing a basic composition of 0 to 5%, containing substantially no metal oxide, and having an average coefficient of thermal expansion in a temperature range of 30 to 380 ° C. of 30 to 85 ⁇ 10 1 7 /. , You wherein the glass viscosity at the liquidus temperature of 10 5 ⁇ 2 d P a ⁇ s or greater.
- the semiconductor package cover glass of the present invention in mass%, S i 0 2 58 ⁇ 7 5 %, A 1 2 0 3 0. 5 ⁇ 15%, B 2 O 3 5 ⁇ 20%, alkali metal oxide 1-20%, Al-earth metal oxide 0-20%, ZnO 0-: Contains the basic composition of LO%, and has an average thermal expansion coefficient of 30-85 X in the temperature range of 30-380 ° C. 10 one 7 / ° C, you wherein the glass viscosity at the liquidus temperature of 10 5 ⁇ 2 dP a ⁇ s or more.
- the method for producing a power par glass for a semiconductor package comprises the steps of: charging a glass raw material into a melting tank having at least an inner wall formed of a refractory material; It is characterized in that it is formed into a plate shape by a method or a float method.
- the cover glass for a semiconductor package of the present invention has an unpolished light-transmitting surface and a surface roughness (R a) of 1.0 nm or less, thereby suppressing malfunction of the element due to scattering of incident light.
- R a surface roughness
- the presence or absence of foreign matter and dust can be accurately detected by image inspection, and display defects such as black stripes can be prevented.
- mass production can be performed at low cost, and since no polishing is required and free abrasive grains are not used, emission of ⁇ -rays due to cerium oxide can be prevented. .
- a cover glass for a semiconductor package having few platinum bumps, a non-polished light transmitting surface and a surface roughness (R a) of 1.0 nm or less. can be easily manufactured.
- FIG. 1 is a perspective view illustrating a cover glass for a semiconductor package according to an embodiment.
- FIG. 2 is an explanatory diagram showing a method of forming a sheet glass by an overflow down draw method.
- FIG. 3 is an explanatory view showing a method of shredding a large glass sheet by laser scribe.
- the cover glass for a semiconductor package of the present invention has a non-polished light-transmitting surface and a surface roughness (R a) of 1.0 nm or less.
- R a surface roughness
- Such a cover glass having a high surface quality can be formed by a down-draw method or a float method.
- the overflow down-draw method and the slot down-draw method are suitable, but especially in the case of the overflow-down-draw method, the glass surface is a free surface and comes into contact with other parts. Control the melting and molding conditions to achieve the desired wall thickness
- a cover glass for a semiconductor package 0.05 to 0.7 mm
- a sheet glass having excellent surface smoothness can be obtained. That is, overflow
- the surface roughness (Ra) is 1.0 nm or less without forming fine scratches due to polishing. It is possible to produce a cover glass having a thickness of 0.5 nm or less, and even 0.3 nm or less.
- the surface roughness (Ra) of the light-transmitting surface of the cover glass is representative of the surface smoothness of the quality, One by the applying the test method based on JIS B0601: can be measured Te.
- the float method a method in which molten glass is supplied onto a metal tin bath melted in a reducing atmosphere to form a plate, or a method in which molten glass is supplied onto a support, and the support and glass are mixed with each other, :
- a method in which a vapor film forming agent slides on each other through a thin layer of a vaporized vapor film to form a plate can be used.
- the cover glass formed by the float method is inferior in surface quality to the power bar glass formed by the down-draw method, and may be polished if necessary. However, even in this case, the polishing time should be shortened so that the decrease in productivity should be minimized, and the adverse effect on the characteristics of the solid-state imaging device generated by polishing should be minimized.
- the semiconductor package cover first glass of the present invention if it is viscosity of the glass at the liquidus temperature (liquidus viscosity) force S 10 5 ⁇ 2 d P a ⁇ s or more, devitrification occurs in the glass It is difficult to perform, and molding by the down-draw method is possible. That, S i 0 2 -A 1 2 0 3 -B 2 0 3 - when molding with RO (or R 2 0) based glass substrate, down draw method, the viscosity of your Keru glass molding portion, approximately 10 It is equivalent to 5 ⁇ ° d Pa ⁇ s.
- liquidus viscosity of around 10 5 'Q dP a ⁇ s or if is less, devitrification product is likely to occur in the formed glass. If devitrified material is generated in the glass, the light transmittance is impaired, and the glass cannot be used as a cover glass. Therefore, when forming glass by the down-draw method, it is desirable that the liquidus viscosity of the glass be as high as possible, and the liquidus viscosity of the cover glass for a semiconductor package is at least 10 5 ′ 2 dPas. It is necessary.
- liquid The phase viscosity is preferably 1 O 5 ′ 4 dPa ⁇ s or more, and more preferably 10 5 ′ 8 dPa-s or more.
- the cover glass for a semiconductor package of the present invention has an average thermal expansion coefficient in a temperature range of 30 to 380 ° C. of 30 to 85 ⁇ 10 17 3 ⁇ 4, so that an adhesive made of an organic resin or a low-melting glass can be used. Even if it is sealed with an alumina package (approximately 70 X 10 to VoC ) or various resin packages using a material, no distortion occurs inside, and a good sealing state can be maintained for a long period of time. It is possible.
- a preferable thermal expansion coefficient of the cover glass is 35 to 80 ° C.- 7 Z ° C, and a more preferable thermal expansion coefficient is 50 to 75 ⁇ 10 7 Z ° C.
- the soft emission of the solid-state imaging device due to the a-line can be reduced by restricting the amount of ⁇ -ray emission to not more than 0.1 OcZcm 2 hr. .
- the U content in the glass is 1 O ppb or less, and the Th content Should be kept below 20 ppb.
- the amount of ⁇ -ray emission from the cover glass should be less than 0.005 cZcin 2 hr. More preferably, it is preferably 0.003 cZcni 2 ⁇ hr or less. Further, it is preferable that the amount of U is 5 ppb or less, the amount of Th is 10 ppb or less, and the amount of U is 4 ppb or less and the amount of Th is 8 ppb or less. Since U emits ⁇ rays more easily than Th, the allowable amount of U is smaller than the allowable amount of Th.
- the semiconductor package cover first glass of the present ⁇ the density of the glass is 2. 55 g / cm 3 or less (preferably 2. 45 gZ C m 3 or less), an alkali elution amount is 1. Omg less (preferably (Less than 0.1 mg, more preferably less than 0.1 mg) is particularly suitable for use in portable electronic devices used outdoors. In other words, devices such as video cameras, digital still cameras, mobile phones, PDAs (Personal Digital Assistants) are sometimes used outdoors, so they are lightweight, suitable for carrying, and have high weather resistance. Is required. Therefore, the cover glass for a solid-state image sensor package used for these applications is stable in addition to being lightweight. It must have excellent weather resistance and have such characteristics that the surface quality does not deteriorate even when used outdoors under harsh environments. Therefore, it is desired that the cover glass used in this application is reduced in weight by decreasing the density of the glass, and that the weather resistance is improved by decreasing the amount of alkali elution.
- the cover glass for a semiconductor package of the present invention preferably has a thickness of 0.05 to 0.7 mm. As the wall thickness increases, the transmittance decreases, and it is difficult to reduce the weight and thickness of the device. On the other hand, if the thickness is too thin, the practical strength is insufficient, and the deflection of the large glass sheet becomes too large to handle. A more preferred thickness is 0.1 to 0.5 mm, and a still more preferred thickness is 0.1 to 0.4 mm.
- the semiconductor package cover glass of the present invention preferably has a Young's modulus of 65 GPa or more, and more preferably 67 GPa or more. The Young's modulus indicates how easily the cover glass is deformed under a constant external force.
- the specific Young's modulus of the cover glass (catcher's modulus Z density) is 27GP a / g ⁇ cm one 3 or more, the properties will have a difficult and lightweight and deformation Since it satisfies, it is particularly suitable as a cover glass for a solid-state imaging device used in portable electronic equipment. From such a viewpoint, the specific Young's modulus of the cover glass for a solid-state imaging device is desired to be as large as possible, and is preferably 28 GPa / g ⁇ cm ⁇ 3 or more.
- the cover glass for a semiconductor package of the present invention preferably has a Vickers hardness of 500 or more, since the surface is hardly damaged. The reason is that if minute scratches are formed on the surface of the cover glass in the electronic device assembling process, the transport process, or the like, it will be defective in the image inspection process after mounting on the solid-state imaging device.
- a more preferred bite hardness is 520 or more.
- a power bar glass containing a basic composition of Z ⁇ 0 to 5% and containing substantially no metal oxide is preferable. Since the cover glass having such a composition has an alkali elution amount of less than 0.01 mg, it has an advantage that it has excellent weather resistance and does not degrade its appearance quality even when used for a long time.
- “substantially not contained” means that the content of the component is less than 2000 ppm.
- the alkali elution amount can be measured by applying a test method based on JISR 3502.
- S i 0 2 is a main component serving as a skeleton constituting the glass, is effective for you improve the weather resistance of the glass, when too much, the high temperature viscosity of the glass increases, meltability deteriorates At the same time, the liquidus viscosity tends to increase. Therefore, the content of SiO 2 is 52 to 70%, preferably 53 to 67%, more preferably 55 to 65%.
- the force is a component to increase the weather resistance and liquid viscosity of the glass S, if too much, the high temperature viscosity of the glass is increased, there is a tendency that the meltability deteriorates.
- the content of A 1 2 0 3 is 5-20%, preferably 8-19%, more preferably, 10; is I 8%.
- B 2 0 3 acts as a flux, lowering the viscosity of the glass, is a component that improves the SasageTorusei. Further, it is a component for increasing the liquidus viscosity. However, when the B 2 0 3 is too large, the weather resistance of the glass tends to decrease. Thus, the content of B 2 0 3 is 5-20%, is preferred properly 6 to 15%, more preferably 7 to 13%.
- Alkali earth metal oxides (Mg0, Ca0, Sr0, BaO) are components that improve the weather resistance of glass, lower the viscosity of glass, and improve the meltability. If it is too large, the glass tends to be devitrified and the density tends to increase. Therefore, the content of the alkaline earth metal oxide is 4 to 30%, preferably 5 to 20%, and more preferably 6 to 16%.
- CaO is a component that makes it relatively easy to obtain high-purity raw materials and significantly improves the meltability and weather resistance of glass.
- the content of CaO is less than 1.5%, the above effect is small, and when it exceeds 15%, the weather resistance decreases. Achieve more stable quality
- BaO and SrO significantly increase the density of glass, so if you want to lower the density, restrict their contents to 12% or less and 10% or less, and furthermore, combine the contents of both. It is preferable to regulate the amount to 6.5 to 13 ° / 0 . Also, since BaO and SrO tend to contain radioisotopes in the raw material, if it is desired to reduce the emission of astigmatism, the total content of both should be 8.5% or less, preferably 3%. Below, more preferably 1.4% or less.
- the molten glass has the effect of inhibiting B 2 0 3 or an alkaline earth metal oxide is ⁇ , when the content in a large amount, the glass is easily devitrified And the density is undesirably increased. Therefore, the upper limit of the content is 5% or less, preferably 3 ° / 0 or less, more preferably 1% or less.
- alkali metal oxides Na 2 O, K 20 , Li 20
- the amount of alkali eluted from the glass increases, and the weather resistance decreases. It is preferred to keep it below.
- the content of the alkali metal oxide be less than 0.1%, more preferably less than 0.05%.
- the cover glass for the solid-state imaging device package is often bonded using an organic resin (for example, epoxy resin).
- an organic resin for example, epoxy resin
- the cover glass contains an alkali component
- the alkali component gradually becomes an adhesive.
- an organic resin such as an epoxy resin
- the adhesive strength between the cover glass and the package is likely to gradually decrease. As a result, a gap may be formed between the two, or the cover glass may be peeled off, so that the intended purpose of protecting the solid-state imaging device may not be achieved.
- S i O 2 is the main component that constitutes the skeleton that constitutes the glass, and is effective in improving the weather resistance of the glass.However, if it is too large, the high-temperature viscosity of the glass increases, and the meltability deteriorates. At the same time, the nighttime viscosity tends to increase.
- the content of S i 0 2 is 58-7 5%, preferably from 58 to 72%, more preferably, 60% to 70%, most preferably from 60 to 68.5%.
- a 1 2 0 3 is an essential component in order to increase the liquidus viscosity, when too large, increases the high temperature viscosity of the glass tends to have meltability deteriorates.
- the content of A 1 2 O 3 is 0.5 to 15%, preferably, 1.1 to 12%, more preferably, 3.5 to 12%, most preferably 6-11%.
- B 2 0 3 acts as a flux, lowering the viscosity of the glass, is a component that improves the fusibility. It is a component for further increasing the liquidus viscosity.
- the content of B 2 0 3 is 5-20%, is preferred properly, 9-18%, more preferably 11-18%, most preferably 12 to: a L 8%.
- Alkali metal oxides reduce the viscosity of glass, improve its melting properties, and effectively adjust the coefficient of thermal expansion and liquidus viscosity. If it is contained in a large amount, the weather resistance of the glass is significantly deteriorated. Therefore, the content of the alkali metal oxide is 1 to 20%, preferably 5 to 18%, and more preferably 7 to 13%.
- Na 2 ⁇ has a large effect of adjusting the thermal expansion coefficient
- K 20 has a large effect of improving the liquidus viscosity. Therefore, when used together Na 2 O and kappa 2 0, while maintaining a high liquidus viscosity, it is possible to adjust the thermal expansion coefficient.
- the content of N a 2 0 is from 0.1 to 11%
- the content of kappa 2 0 is 0.
- (Na 2 0 + K 2 0) Bruno Na 2 to O ratio is 1.1 to 10
- the ratio of (Na 20 + K 20 ) ZNagO is preferably from 1.1 to 5, more preferably from 1.2 to 3.
- S i O 2 / (A 1 2 0 3 + K 2 O) ratio of 3 to 12, preferably 4; If LO is regulated, it is possible to obtain a high liquidus viscosity while maintaining the weather resistance and melting property of the glass. is there. .
- Li 2 O is likely to contain radioisotopes in the raw material, its content is 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and most preferably 0 to 0. Should be regulated to 5%.
- Alkali earth metal oxides (Mg0, Ca0, Sr0, BaO) are components that improve the weather resistance of glass, lower the viscosity of glass, and improve the meltability. If it is too large, the glass tends to be devitrified and the co-density tends to increase. Therefore, the content of the alkaline earth metal oxide is 0 to 20%, preferably 0.5 to 18%, and more preferably 1.0 to 18%.
- CaO is a component that can relatively easily obtain a high-purity raw material and significantly improves the melting property and weather resistance of glass. It is preferable to contain 0.5 to 10%, and more preferably 1 to 8%. New However, since Ba'O and SrO tend to increase the density, if it is desired to decrease the density, the total content of these should be 13% or less, preferably 10% or less, more preferably 7%. The following should be regulated: Also, since BaO and SrO tend to contain radioisotopes in the raw material, if it is desired to reduce the amount of ⁇ -ray emission to 0.01 cZcm 2 'hr or less, the content of each should be 3% or less. Furthermore, it is preferable to regulate it to 1.4% or less.
- ZnO is excellent in improvement to ⁇ ) effect weather resistance, also improves the meltability of the glass, it is effective in suppressing the molten glass ska et al, B 2 O 3 and alkali metal oxides to volatilize.
- the Z ⁇ 2% or more when the content of A 1 2 O 3 is 3% or less, because there is a tendency that weather resistance is significantly reduced, the Z ⁇ 2% or more, and it is more preferably contained 4. 5% or more.
- the content of ZnO should be 10% or less, preferably 9% or less, and more preferably 6% or less. It is.
- P 2 0 5, Y 2 0 3, Nb 2 0 3, La 2 0 or components 3 such as is contained 5% or less, it is possible to contain various fining agents up to 3%.
- the clarifying agents, Sb 2 O 3, Sb 2 O 5, F 2, C 1 2, C, S0 3, Sn_ ⁇ 2, or Al, 1 kind of metal powder such as S i or two or more can be used .
- a s 2 0 3 is broad because the temperature range can and this 1 'for generating the fining gas (1300 to 1700 ° approximately C), is widely used as a fining agent for glass of this kind conventionally, material It is easy to contain radioisotopes in it. Moreover, As 2 0 3 is highly toxic, it can contaminate the environment when processing in manufacturing processes or waste glass of glass. Therefore, As 2 should be substantially not contained. PbO and CdO are also highly toxic and should not be used. Furthermore, Sb 2 ⁇ 3, S b 2 ⁇ 5 also, similarly to the As 2 0 3, the force still virulent an excellent component in refining effect, it is desirable not to contain as much as possible.
- S i 0 2 in the present invention A 1 2 O 3 - B 2 0 3 -
- S b 2 O 3 and S b 2 0 0 5 is in total.
- F 2, C 1 2, S0 3, C, Sn0 2 is 0.5 in total from 1 to 3.0% (especially C l 2 0. 005 ⁇ 1.
- S io 2-A 1 2 0 3 - B 2 0 3 - For R 2 0 based glass and excellent meltability, 0 Sb 2 0 3 and S b 2 0 5 is the total amount.
- F 2, C 1 2, S0 3, C, that SnO 2 is to contain so that from 0.1 to 3.0% the percentage of in total preferred.
- Fe 2 O 3 can be used as a fining agent, but its content should be regulated to 500 ppm or less, preferably 300 ppm or less, and more preferably 200 ppm or less to color the glass. .
- Ce0 Although 2 can also be used as a refining agent, to color the glass, the content is 2% or less, preferably 1% or less, and more preferably it should be restricted to less than 7% 0.1.
- T i 0 2 improves weather resistance of the glass, has a effect of lowering the high temperature viscosity, to promote coloration due to F e 2 0 3, which contains a large amount preferably Absent. However, F e 2 0 3 is equal to 200 j) pm or less, as possible out be contained up to 5%.
- Z r 0 2 is a component for improving weather resistance, since contains or combed radioisotopes in raw material, the content of 0-2%, preferably 0 to 0.5%, more preferably 500 p Should be regulated below pm
- Semiconductor package cover glass of the present Ming Ming while having a basic composition mentioned above, by employing a high-purity raw material, impurities difficulty mixed, so maintenance molten environment, U, Th, Fe 2 O 3, PbO, T i 0 2, Mn0 2, Z r O 2 , etc. this to precisely control the content of: and are possible.
- a high-purity raw material impurities difficulty mixed, so maintenance molten environment, U, Th, Fe 2 O 3, PbO, T i 0 2, Mn0 2, Z r O 2 , etc.
- This to precisely control the content of: and are possible.
- Particularly affects the transmittance of near ultraviolet Fe 2 0 3, PbO, T i 0 2, for Mn_ ⁇ 2, Ri can der be managed in each 1 to 100 ppm order, the CCD elements by ⁇ -rays U and Th that cause soft errors can be managed in the order of 0.1 to 10 ppb each.
- CCDs tend to cause soft errors due to
- a glass raw material mixture is prepared so as to obtain a glass having a desired composition.
- a high-purity raw material containing few impurities such as U and Th is used. More specifically, a high-purity raw material whose U and Th contents are each 5 ppb or less is used.
- the prepared glass material is put into a melting tank and melted.
- a platinum container including a platinum rhodium container
- alumina refractories for example, alumina electric bricks
- quartz refractories for example, silica blocks
- U and D are low.
- ⁇ ! ! ! Less than It is preferable because U and Th are less eluted into glass.
- homogenization defoaming and striae removal
- This refining tank may be made of refractory or platinum.
- zirconia refractories have very good erosion resistance, but should be avoided because they contain a large amount of radioisotopes.However, the amount of impurities in zirconia refractories is reduced, and U, Th If the content of each is less than 1 ppm, it can be used for the inner wall of the melting tank to produce cover glass for semiconductor packages with low ⁇ -ray emission.
- the homogenized molten glass is formed into a plate by a downdraw method to obtain a plate glass having a desired thickness.
- a downdraw method an overflow downdraw method or a slot downdraw method can be used.
- the sheet glass thus obtained is cut into predetermined dimensions and, if necessary, chamfered to produce a cover glass.
- the cover glass for a package of the present invention will be described based on examples.
- FIG. 1 shows a cover glass 10 for a semiconductor package according to an example.
- the cover glass 10 for a semiconductor package includes a plate having a first light-transmitting surface 10a and a second light-transmitting surface 10 that face each other in a plate thickness direction, and a side surface 10c that forms a peripheral edge. Glass.
- the dimensions of the cover glass 10 are 14 x 16 x 0.5 mm, the first light-transmitting surface 10a and the second light-transmitting surface 10b are unpolished surfaces, and the surface roughness is (R a) is less than or equal to 0.5 nm.
- the side surface 10c has a chamfered shape.
- the first manufacturing process of sheet glass is a process of manufacturing a large sheet glass having a side of 50 Omm or more.
- the overflow downdrawing method is most suitable for forming a sheet glass having excellent surface quality.
- the molten glass 12 flows through a gutter 11 made of a refractory material, and the molten glass 12 overflowing from both sides of the gutter 11 at the bottom of the gutter 11 as shown in Fig. 2 .
- a laser scribe is a laser cutting machine that uses a thermal processing laser cutting device to move the laser beam on one side of the large glass to a thickness of about 20% in the thickness direction, at a speed of 180 ⁇ 5 mmZec or 220 ⁇ 5 mmZs. ec, laser output
- S i 0 2 - illustrates an embodiment of a package cover glass of the present invention consisting of RO-based glass (Sample No. 1 ⁇ 5) - A 1 2 0 3 - B 2 0 3.
- the glass samples in Table 1 were prepared as follows. First, a glass raw material prepared to have the composition shown in Table 1 was placed in a platinum rhodium crucible and melted in an electric melting furnace having a stirring function at 160 ° C. for 20 hours. Next, the molten glass was poured onto a carbon plate and slowly cooled to produce a glass sample, and various characteristics were examined.
- a high-purity glass raw material prepared so as to have the composition shown in the table is put into a crucible made of platinum rhodium, alumina, or quartz, and placed in an electric melting furnace having a stirring function at 150 ° C. C, melted for 6 hours, and the molten glass was poured out onto a carbon plate.
- each glass sample satisfies the conditions required for the cover glass for semiconductor package in terms of the coefficient of thermal expansion, the density, and the amount of ⁇ -ray emission.
- the temperature corresponding to the viscosity of s is 1,500 ° C or less, so it has excellent meltability, the liquidus temperature is 884 ° C or less, and the liquidus viscosity is 10 5 ⁇ 8 dPa ' s or more, it was excellent in devitrification resistance.
- the alkali elution amount in the table was measured based on JISR 3502.
- the density was measured by the well-known Archimedes method.
- the specific Young's modulus was calculated from the Young's modulus and density measured by the bending resonance method using a nondestructive elastic modulus measurement device (KI-11) manufactured by Kanebo Co., Ltd. Vickers hardness was measured based on JISZ 2244-1992.
- For the coefficient of thermal expansion an average coefficient of thermal expansion in a temperature range of 30 to 380 ° C was measured using a dilatometer.
- the liquidus temperature was determined by crushing each glass sample to a particle size of 300 to 500 ⁇ m, placing it in a platinum boat, holding it in a temperature gradient furnace for 8 hours, and then observing the sample with a microscope. The highest temperature at which devitrification (crystal foreign matter) was observed was measured, and the temperature was taken as the liquidus temperature. The viscosity of the glass at the liquidus temperature was defined as the liquidus viscosity.
- the glass samples of Nos. 11 and 12 did not show devitrification, and were particularly excellent in devitrification resistance. U and Th contents were measured by ICP-MASS.
- strain point and the annealing point were measured according to the method of ASTM C 336-71, and the softening point was measured according to the method of ASTM C 338-93.
- 10 4 d P a ⁇ s temperature, 1 0 3 d P a ⁇ s temperature, and 1 0 2 ⁇ 5 d P a ⁇ s temperature was determined by a known platinum ball pulling method.
- 1 0 2 ⁇ 5 P a ⁇ s temperature is a measure of the temperature corresponding to 1 0 2-5 Boyes a high temperature viscosity, so that this value is better to lower the melting property.
- the amount of spontaneous emission was measured using an ultra-low level ⁇ -ray measuring device (Sumitomo Chemical Co., Ltd. LACS-4000M).
- the glass samples Nos. 1, 6, 11, 14, and 15 in Tables 1 to 3 were melted in a test melting tank (alumina refractory), and the thickness was adjusted to 0.5 by the o-perflow downdraw method.
- a 14 mm long and 16 mm wide cover glass was fabricated by shaping the plate into a plate of mm and cutting the surface with a laser scribe without polishing the surface.
- the glass raw material was mixed with the above glass so that the glass of Sample No. 1 was obtained. After being melted in the melting tank, it was molded into a piece of 800X300X300mm and cut into pieces with a thickness of 1.5mm by cutting using a wire saw. Then, both sides of this sheet glass are precision polished using a rotary polisher to form a large glass (0.5 mm thick), which is cut into small pieces by laser scribing. A cover glass 14 mm wide and 16 mm wide was prepared.
- the surface roughness (Ra) of the front and back light-transmitting surfaces (first and second light-transmitting surfaces) of each cover glass prepared in this way was measured using a Tyler-Ho probe. bson : manufactured by the company). The results are shown in Table 4.
- Table 4 As is clear from Table 4, the cover glasses of the examples each had a surface roughness (Ra) of 0.23 nm or less on the first light-transmitting surface and the second light-transmitting surface. However, the cover glass of the comparative example had a surface roughness (Ra) of 0.56 nm or more despite being subjected to precision polishing. In addition, the light transmitting surface of each cover glass was
- the cover glass for the package of the present invention is suitable as a cover glass for a solid-state image sensor package, and in addition to the cover glass for various semiconductor packages such as a package containing a laser diode.
- the cover glass has an average coefficient of thermal expansion of 30 85 V 7 fc in a temperature range of 30 to 380 ° C, and has an average temperature coefficient of expansion of 70 fc. ⁇ ⁇ Daphte ' ⁇ , Various types made of Kovar alloy, molybdenum metal, 36 Ni-Fe alloy, 42 Ni-Fe alloy, 45 Ni-Fe alloy, 46Ni-Fe alloy, 52 Ni-Fe alloy, etc.
- the package can be sealed with organic resin or low melting point glass.
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Abstract
Description
Claims
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JP2004-35383 | 2004-02-12 | ||
JP2004035383A JP4432110B2 (ja) | 2003-02-19 | 2004-02-12 | 半導体パッケージ用カバーガラス |
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Cited By (2)
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CN110885972A (zh) * | 2019-10-30 | 2020-03-17 | 杭州美迪凯光电科技股份有限公司 | 一种消除摄像模组点子缺陷的ald制备方法及其产物 |
WO2021082402A1 (zh) * | 2019-11-01 | 2021-05-06 | 杭州美迪凯光电科技股份有限公司 | 一种消除摄像模组点子缺陷的ald制备方法及其产物 |
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JP4756337B2 (ja) * | 2004-10-12 | 2011-08-24 | 日本電気硝子株式会社 | 固体撮像素子用カバーガラス |
JP4923556B2 (ja) * | 2005-12-16 | 2012-04-25 | 日本電気硝子株式会社 | 情報記録媒体用ガラス基板 |
JP5071878B2 (ja) * | 2006-09-12 | 2012-11-14 | 日本電気硝子株式会社 | 無アルカリガラスおよびこれを用いた無アルカリガラス基板 |
US7666511B2 (en) * | 2007-05-18 | 2010-02-23 | Corning Incorporated | Down-drawable, chemically strengthened glass for cover plate |
US20100215862A1 (en) * | 2009-02-26 | 2010-08-26 | Sinue Gomez | Method for forming an opal glass |
JP5594522B2 (ja) * | 2009-07-03 | 2014-09-24 | 日本電気硝子株式会社 | 電子デバイス製造用ガラスフィルム積層体 |
KR20130057976A (ko) * | 2010-04-20 | 2013-06-03 | 아사히 가라스 가부시키가이샤 | 반도체 디바이스 관통 전극 형성용 유리 기판 |
JP5894754B2 (ja) * | 2011-09-16 | 2016-03-30 | 浜松ホトニクス株式会社 | レーザ加工方法 |
KR101641980B1 (ko) * | 2012-06-25 | 2016-07-22 | 니폰 덴키 가라스 가부시키가이샤 | 강화 유리 기판 및 그 제조 방법 |
JP6571398B2 (ja) * | 2015-06-04 | 2019-09-04 | リンテック株式会社 | 半導体用保護フィルム、半導体装置及び複合シート |
CN109153596A (zh) | 2016-05-25 | 2019-01-04 | Agc株式会社 | 无碱玻璃基板、层叠基板和玻璃基板的制造方法 |
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JPS6374935A (ja) * | 1986-09-17 | 1988-04-05 | Nippon Electric Glass Co Ltd | 耐薬品性に優れたガラス基板 |
JP2002308643A (ja) * | 2001-02-01 | 2002-10-23 | Nippon Electric Glass Co Ltd | 無アルカリガラス及びディスプレイ用ガラス基板 |
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2004
- 2004-02-12 JP JP2004035383A patent/JP4432110B2/ja not_active Expired - Lifetime
- 2004-02-16 KR KR1020107023852A patent/KR101156984B1/ko active IP Right Grant
- 2004-02-16 WO PCT/JP2004/001659 patent/WO2004075289A1/ja active Application Filing
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JPH11209145A (ja) * | 1998-01-20 | 1999-08-03 | Nippon Electric Glass Co Ltd | 光半導体用窓ガラス |
JP2000143286A (ja) * | 1998-09-04 | 2000-05-23 | Nippon Electric Glass Co Ltd | 鉛溶出の少ない管ガラス |
WO2001056941A1 (de) * | 2000-02-04 | 2001-08-09 | Schott Glas | Alkalihaltiges aluminoborosilicatglas und seine verwendung |
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CN110885972A (zh) * | 2019-10-30 | 2020-03-17 | 杭州美迪凯光电科技股份有限公司 | 一种消除摄像模组点子缺陷的ald制备方法及其产物 |
WO2021082402A1 (zh) * | 2019-11-01 | 2021-05-06 | 杭州美迪凯光电科技股份有限公司 | 一种消除摄像模组点子缺陷的ald制备方法及其产物 |
US11804501B2 (en) | 2019-11-01 | 2023-10-31 | Hangzhou Mdk Opto Electronics Co., Ltd | ALD preparation method for eliminating camera module dot defects and product thereof |
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JP4432110B2 (ja) | 2010-03-17 |
TWI400208B (zh) | 2013-07-01 |
TWI358396B (en) | 2012-02-21 |
KR20100119828A (ko) | 2010-11-10 |
KR101015428B1 (ko) | 2011-02-22 |
JP2005126311A (ja) | 2005-05-19 |
TW201118052A (en) | 2011-06-01 |
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KR20050103276A (ko) | 2005-10-28 |
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