WO2012033161A1 - 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
- Publication number
- WO2012033161A1 WO2012033161A1 PCT/JP2011/070480 JP2011070480W WO2012033161A1 WO 2012033161 A1 WO2012033161 A1 WO 2012033161A1 JP 2011070480 W JP2011070480 W JP 2011070480W WO 2012033161 A1 WO2012033161 A1 WO 2012033161A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- cover glass
- semiconductor package
- less
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
- H10F39/011—Manufacture or treatment of image sensors covered by group H10F39/12
-
- 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
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
- H10F39/80—Constructional details of image sensors
- H10F39/804—Containers or encapsulations
Definitions
- the present invention relates to a cover glass for a semiconductor package that is attached to the front surface of a semiconductor package that houses a solid-state imaging device and a laser diode, and that protects the solid-state imaging device and the laser diode and is used as a transparent window.
- the present invention relates to a cover glass of a plastic package in which a solid-state imaging device such as CMOS (Complementary Metal Oxide Semiconductor) is accommodated.
- CMOS Complementary Metal Oxide Semiconductor
- Optical semiconductors that are currently widely used as solid-state image sensors include CCDs (Charge Coupled Devices) and CMOS (Complementary Metal Oxide Semiconductors).
- CCDs are mainly mounted on video cameras in order to capture high-definition images, but in recent years, the use range of images has been rapidly expanded as the use of image data processing has accelerated. In particular, they are mounted on digital still cameras and mobile phones, and are increasingly used to convert high-definition images into electronic information data.
- CMOS also called complementary metal oxide semiconductor, can be downsized compared to a CCD, consumes less than 1/5 power, and can utilize the manufacturing process of a microprocessor.
- a solid-state image sensor is placed in a semiconductor package made of a ceramic material such as alumina, a metal material, or a plastic material, and a flat cover glass serving as a transparent window is bonded with various organic resins or low-melting glass. Adhered with a material and hermetically sealed.
- the semiconductor package cover glass is required to emit less ⁇ rays. This is because a soft error is caused when the amount of ⁇ rays emitted from the cover glass increases.
- the ⁇ -ray emission from the glass is caused by the radioactive isotopes U (uranium) and Th (thorium) being contained as impurities in the glass. Therefore, when manufacturing glass, a high-purity raw material is used, or a refractory with a low radioactive isotope (eg, alumina electrocast refractory, quartz refractory, platinum) is used for the inner wall of the melting furnace for melting the raw material. Such measures are taken.
- Patent Document 1 discloses a cover glass for a semiconductor package that has a thermal expansion coefficient compatible with that of a plastic package and that emits a small amount of ⁇ rays.
- the cover glass used for them has strict standards for dirt, scratches, adhesion of foreign matter, etc. on its surface, and high-quality cleanliness. The degree is required. Further, in addition to the cleanliness of the surface, it is also required to prevent contamination of crystal defects inside the glass and foreign matters such as platinum. Further, this type of glass is required to have excellent weather resistance so as not to deteriorate the surface quality over a long period of time, to prevent breakage and deformation, and to have a low density so that the weight can be reduced.
- the present invention has been made in view of such circumstances, and it is a technical problem to provide a cover glass for a semiconductor package that has characteristics suitable for a plastic package and that always emits a small amount of ⁇ -rays and a method for manufacturing the same.
- the cover glass for a semiconductor package of the present invention is SiO 2 58 to 75%, Al 2 O 3 1.1 to 20%, B 2 O 3 0 to 10%, Na 2 O 0.1 to 20% by mass%. , K 2 O 0 to 11%, alkaline earth metal oxide 0 to 20%, an average coefficient of thermal expansion in the temperature range of 30 to 380 ° C. is 90 to 180 ⁇ 10 ⁇ 7 / ° C., and Young's modulus is 68 GPa or more. The amount of ⁇ rays emitted from the glass is 0.05 c / cm 2 ⁇ hr or less. “Average thermal expansion coefficient” means an average thermal expansion coefficient in a temperature range of 30 to 380 ° C.
- the “ ⁇ -ray emission amount” is a value measured using an ultra-low level ⁇ -ray measuring apparatus (LACS-4000M manufactured by Sumitomo Chemical Co., Ltd.).
- the thermal expansion coefficient and Young's modulus are compatible with the plastic package, even when used as a cover glass of the plastic package, warpage or deformation due to a difference in thermal expansion, or cracking or peeling of the glass does not occur. .
- the U content in the glass is 100 ppb or less and the Th content is 200 ppb or less.
- the ⁇ -ray emission amount can be accurately reduced.
- ZrO 2 , As 2 O 3 and BaO are not substantially contained.
- the ⁇ -ray emission amount can be accurately reduced.
- the total amount of alkali metal oxide and alkaline earth metal oxide is preferably 21 to 35% by mass.
- the “total amount of alkali metal oxide and alkaline earth metal oxide” means the total content of Na 2 O, K 2 O, Li 2 O, CaO, MgO, SrO, and BaO.
- the glass viscosity at the liquidus temperature is preferably 10 4.7 dPa ⁇ s or more.
- the liquidus temperature means a temperature measured as follows. First, each glass sample is crushed to a particle size of 300 to 500 ⁇ m, put into a platinum boat, and held in a temperature gradient furnace for 8 hours. Thereafter, the sample was observed with a microscope, and the highest temperature among the temperatures at which devitrification (crystal foreign matter) was observed inside the glass sample was defined as the liquidus temperature. The viscosity of the glass at the liquidus temperature was defined as the liquidus viscosity.
- the conventional cover glass may not be able to accurately detect the presence or absence of foreign matter or dust during image inspection before shipment, or may cause malfunction.
- the cause is considered as follows.
- innumerable fine irregularities fine polishing flaws
- the irradiated light is refracted due to the irregularities on the cover glass translucent surface, and there will be a mixture of parts that appear bright and parts that appear dark. It may cause the situation that the presence or absence of the cannot be detected accurately.
- the cover glass for a semiconductor package preferably has an unpolished surface.
- “Having an unpolished surface” means having a surface quality that can be used as a cover glass in an unpolished state. More specifically, it means that the surface roughness (Ra) is 1.0 nm or less.
- the surface roughness (Ra) represents the quality of surface smoothness, and can be measured by applying a test method based on JIS B0601.
- the precision polishing process can be omitted, it can be mass-produced at low cost.
- the ratio of SiO 2 / (Al 2 O 3 + K 2 O) is preferably 1 to 12 on a mass basis.
- the ratio of (Na 2 O + K 2 O) / Na 2 O is preferably 1.1 to 10 on a mass basis.
- the cover glass for a semiconductor package of the present invention is preferably used for a plastic package for CMOS.
- the manufacturing method of the semiconductor package of the present invention is, by mass%, SiO 2 58 to 75%, Al 2 O 3 1.1 to 20%, B 2 O 3 0 to 10%, Na 2 O 0.1 to 20%. , K 2 O 0 to 11%, alkaline earth metal oxide 0 to 20%, and glass raw material having an average coefficient of thermal expansion of 90 to 180 ⁇ 10 ⁇ 7 / ° C. in the temperature range of 30 to 380 ° C.
- the glass raw material and the melting equipment are selected so that the amount of ⁇ -ray emitted from the glass is 0.05 c / cm 2 ⁇ hr or less while being formed into a plate shape using the overflow downdraw method after being prepared and melted It is characterized by performing.
- “selection of melting equipment” means selecting and using a melting tank, a clarification tank or the like made of a material having a low content of radioisotope.
- the cover glass of the present invention can be easily produced.
- the raw material batch it is preferable to select the raw material batch and adjust the melting conditions so that the U content in the glass is 100 ppb or less and the Th content is 200 ppb or less.
- the ⁇ -ray emission amount of the obtained glass can be accurately reduced.
- the ⁇ -ray emission amount of the obtained glass can be accurately reduced.
- the cover glass of the present invention is, by mass%, SiO 2 58 to 75%, Al 2 O 3 1.1 to 20%, B 2 O 3 0 to 10%, Na 2 O 0.1 to 20%, K 2. O 0.1 to 11%, alkaline earth metal oxide 0 to 20%.
- SiO 2 is a main component serving as a skeleton constituting the glass, and has an effect of improving the weather resistance of the glass.
- the content of SiO 2 is 58 to 75%, preferably 60 to 73%, more preferably 62 to 69%.
- Al 2 O 3 is a component that increases the weather resistance and liquid phase viscosity of glass and improves the Young's modulus. However, if the content of Al 2 O 3 is too large, the high-temperature viscosity of the glass tends to increase and the meltability tends to deteriorate.
- the content of Al 2 O 3 is 1.1 to 20%, preferably 1.1 to 18%, 1.1 to 17%, 1.1 to 17.5%, 3.5 to 16.5% More preferably, it is 4 to 16%.
- B 2 O 3 is a component that works as a flux, lowers the viscosity of the glass, and improves the meltability. Furthermore, it is a component for increasing the liquid phase viscosity. However, if the content of B 2 O 3 is too large, the weather resistance of the glass tends to decrease.
- the content of B 2 O 3 is 0 to 10%, preferably 0 to 9%, 0 to 8%, 0 to 5%, 0 to 3%, 0 to 2%, 0 to 1.9%, Preferably, it is 0 to 1%.
- Alkali metal oxides (Na 2 O, K 2 O, Li 2 O) are components that lower the viscosity of the glass, improve the meltability, and effectively adjust the thermal expansion coefficient and liquid phase viscosity.
- the total amount of alkali metal oxides is preferably 0 to 27%, preferably 1 to 27%, more preferably 5 to 25%, and particularly preferably 7 to 23%.
- Na 2 O is particularly effective in adjusting the thermal expansion coefficient
- K 2 O is effective in increasing the liquid phase viscosity. Therefore, when Na 2 O and K 2 O are used in combination, the thermal expansion coefficient and the liquid phase viscosity can be easily adjusted. Therefore it is preferable to contain as essential components Na 2 O and K 2 O in the present invention.
- the content of Na 2 O is 0.1 to 20%, preferably 3 to 18%, more preferably 8 to 17%.
- the content of K 2 O is 0 to 11%, preferably 0 to 9%, 0 to 7%, more preferably 0 to 2%, particularly preferably 0 to 1%.
- the total amount of Na 2 O and K 2 O is preferably 4 to 22%, more preferably 6 to 20%.
- Li 2 O can be contained. However, since Li 2 O tends to contain a radioisotope in the raw material, its content is preferably regulated to 0 to 5%, 0 to 3%, 0 to 1%, particularly 0 to 0.5%.
- the ratio of (Na 2 O + K 2 O) / Na 2 O when regulated to be 1.1 to 10 on a mass basis, a high liquid phase viscosity is easily obtained.
- the ratio of (Na 2 O + K 2 O) / Na 2 O is preferably 1.1 to 5, and more preferably 1.2 to 3.
- Alkaline earth metal oxides are components that improve the weather resistance of the glass, lower the viscosity of the glass, and improve the meltability. However, if the content of these components is excessive, the glass tends to be devitrified and the density tends to increase.
- the total content of the alkaline earth metal oxide is 0 to 20%, preferably 0.5 to 18%, more preferably 1.0 to 18%.
- BaO and SrO tend to increase the density. Therefore, when it is desired to decrease the density, it is desirable to regulate each to 12% or less, particularly 10% or less. For the same reason, it is preferable to restrict the total amount of both to 6.5 to 13%.
- BaO and SrO tend to contain radioactive isotopes in the raw material, when it is desired to reduce the amount of ⁇ -ray emission, it is preferably 0 to 3%, more preferably 0 to 1%, and still more preferably 0. It is desirably 0.8%, most preferably 0 to 0.5%, and if possible, it is desirably substantially not contained.
- substantially free of BaO and SrO means that the contents of SrO and BaO in the glass composition are each 0.2% or less.
- the average coefficient of thermal expansion in the temperature range of 30 to 380 ° C. is 90 to 180 ⁇ ⁇ 7 / ° C.
- the total amount of alkali metal oxide and alkaline earth metal oxide is 21 to 35%, particularly 22 to 33%.
- inconveniences such as a fall of a Young's modulus and a fall of a liquid phase viscosity, may arise.
- 5% or less of components such as P 2 O 5 , Y 2 O 3 , Nb 2 O 3 , La 2 O 3 and the like are included within a range not impairing the properties of the glass. it can.
- PbO, CdO, etc. are highly toxic and should be avoided.
- various fining agents can be incorporated up to 3% in total.
- the fining agent Sb 2 O 3 , Sb 2 O 5 , F 2 , Cl 2 , C, SO 3 , SnO 2 , or metal powder such as Al or Si can be used.
- the SiO 2 —Al 2 O 3 —B 2 O 3 —RO system composition system containing SiO 2 , Al 2 O 3 , B 2 O 3 and alkaline earth metal oxides as essential components
- the total amount of Sb 2 O 3 and Sb 2 O 5 is 0.05 to 2.0%
- the total amount of F 2 , Cl 2 , SO 3 , C, and SnO 2 is 0.1 to 3.%. It is preferable to use the composition so that the ratio is 0% (particularly Cl 2 0.005 to 1.0%, SnO 2 0.01 to 1.0%).
- SiO 2 —Al 2 O 3 —B 2 O 3 —R 2 O glass composition system containing SiO 2 , Al 2 O 3 , B 2 O 3 and alkali metal oxides as essential components
- Sb 2 O 3 and Sb 2 O 5 are 0.2% or less in total
- F 2 , Cl 2 , SO 3 , C, SnO 2 are 0.1 to 3.0 in total. It is preferable to make it contain so that it may become a ratio of%.
- As 2 O 3 is capable of generating a clarification gas in a wide temperature range (about 1300 to 1700 ° C.), so far it has been widely used as a clarifier for this type of glass. Easy to contain elements. In addition, As 2 O 3 is very toxic and may contaminate the environment during the glass production process or waste glass processing. Therefore, As 2 O 3 should be substantially not contained. Further, Sb 2 O 3 and Sb 2 O 5 are components having an excellent clarification effect as well as As 2 O 3. However, since they are also highly toxic, it is desirable that they are not substantially contained if possible.
- “substantially does not contain” means that the content of As 2 O 3 in the glass composition is 0.1% or less, desirably 100 ppm or less. Further, the contents of Sb 2 O 3 and Sb 2 O 5 are each 0.1% or less, desirably 0.09% or less, and most desirably 0.05%.
- Fe 2 O 3 can also be used as a fining agent, but in order to color the glass, its content is preferably 500 ppm or less, more preferably 300 ppm or less, and even more preferably 200 ppm or less.
- CeO 2 can also be used as a fining agent, but in order to color the glass, its content is preferably 2% or less, more preferably 1% or less, and even more preferably 0.7% or less.
- ZrO 2 is a component that improves the strain point and Young's modulus of glass, but easily contains a radioisotope in the raw material. Therefore, the use of ZrO 2 has a high risk of causing an increase in the amount of ⁇ -ray emission.
- ZrO 2 is a component that reduces devitrification resistance. In particular, when glass is formed by the overflow down-draw method, crystals due to ZrO 2 are deposited on the interface of the glass with the refractory, and there is a risk that productivity may be reduced during long-term operation.
- the content of ZrO 2 is preferably 0 to 3%, 0 to 2%, 0 to 1%, 0 to 0.5%, particularly 0 to 0.2%, and if possible, it should not be substantially contained. desirable.
- “substantially does not contain ZrO 2 ” means that the content of ZrO 2 in the glass composition is 500 ppm or less.
- TiO 2 has the effect of improving the weather resistance of the glass and lowering the high-temperature viscosity.
- TiO 2 promotes coloring by Fe 2 O 3 and is desirably not substantially contained.
- substantially not containing TiO 2 means that the content of TiO 2 in the glass composition is 500 ppm or less. Note the TiO 2 if it can be less than 200ppm the content of Fe 2 O 3 may be contained up to 5%. However, enormous costs are required to make the Fe 2 O 3 content less than 200 ppm, which is not practical.
- the cover glass for a semiconductor package of the present invention having the above composition can easily have an average coefficient of thermal expansion of 90 to 180 ⁇ 10 ⁇ 7 / ° C. in a temperature range of 30 to 380 ° C. Therefore, even if it is sealed with a plastic package (approximately 100 ⁇ 10 ⁇ 7 / ° C.) using an adhesive made of organic resin or low-melting glass, no internal distortion will occur and good sealing will be achieved over a long period of time. It is possible to keep the state.
- a preferable thermal expansion coefficient of the cover glass is 90 to 160 ⁇ 10 ⁇ 7 / ° C., and a more preferable thermal expansion coefficient is 95 to 130 ⁇ 10 ⁇ 7 / ° C.
- the cover glass for a semiconductor package of the present invention is preferably as the glass has a higher Young's modulus.
- the Young's modulus of the glass is preferably 68 GPa or more, more preferably 70 GPa or more.
- the Young's modulus represents how easily the cover glass is deformed in a state where a certain external force is applied. The larger the Young's modulus, the harder the cover glass is deformed.
- the content of the alkali metal oxide is decreased, or the content of the alkaline earth metal oxide, Al 2 O 3 , B 2 O 3 or the like is increased. do it.
- the cover glass for a semiconductor package of the present invention is preferably as the specific Young's modulus (Young's modulus / density) of the glass is higher. Specifically, it is desirable that the specific Young's modulus of the glass is 27 GPa / g ⁇ cm ⁇ 3 or more, particularly 28 GPa / g ⁇ cm ⁇ 3 or more.
- a high specific Young's modulus satisfies the characteristics of being lightweight and difficult to deform, and is particularly suitable as a cover glass for semiconductor packages used in portable electronic devices.
- the glass for semiconductor packages of the present invention is more preferable as the density of the glass is lower.
- the density of glass is specifically 2.60 g / cm 3 or less, if it is particularly 2.55 g / cm 3 or less, is suitable for use to be mounted on a portable electronic device particularly used outdoors. That is, devices such as a video camera, a mobile phone, and a PDA (Personal Digital Assistant) are sometimes used outdoors, and thus are required to be lightweight and suitable for carrying.
- the content of alkaline earth metal oxide or Al 2 O 3 may be decreased, or the content of B 2 O 3 may be increased.
- the content of the alkali metal oxide may be reduced.
- the cover glass for a semiconductor package of the present invention is preferably as the liquid phase viscosity is higher.
- the viscosity of the glass in the formed portion is about 10 4.7 dPa ⁇ s.
- the liquid phase viscosity of the glass is around 10 4.7 dPa ⁇ s or less, devitrified substances are likely to be generated in the molded glass.
- devitrification occurs in the glass, the translucency is impaired, so that it cannot be used as a cover glass.
- the liquid phase viscosity of the glass be as high as possible.
- the liquid phase viscosity of the glass is 10 4.7 dPa ⁇ s or more, particularly 10 5.0 dPa ⁇ s. It is desirable that it is s or more. In the above range, in order to increase the liquid phase viscosity of the glass, the content of SiO 2 , alkaline earth metal oxide, etc. is decreased, or the content of alkali metal oxide, Al 2 O 3, etc. is increased. do it.
- the cover glass for a semiconductor package of the present invention is characterized in that the amount of ⁇ rays emitted from the glass is 0.05 c / cm 2 ⁇ hr or less. If the amount of ⁇ -ray emission from the glass is small, even if it is mounted on a small solid-state imaging device with high pixels (for example, 1 million pixels or more), it is possible to reduce soft errors caused by ⁇ -rays. In order to reduce the amount of alpha rays emitted to 0.05 c / cm 2 ⁇ hr or less, mixing of impurities from raw materials and melting tanks is prevented, and the amount of U in the glass is suppressed to 100 ppb or less and the amount of Th is suppressed to 200 ppb or less.
- the ⁇ ray emission amount of the window glass is 0.01 c / cm. 2 ⁇ hr or less, 0.0035 c / cm 2 or less, and particularly preferably 0.003 c / cm 2 or less.
- the U amount is preferably 20 ppb or less, 5 ppb or less, particularly 4 ppb or less, and the Th amount is preferably 40 ppb or less, 10 ppb or less, and particularly preferably 8 ppb or less.
- the allowable amount of U is smaller than the allowable amount of Th.
- the light transmitting surface is more preferably a non-polished surface.
- surface roughness (Ra) is preferably 1.0 nm or less, more preferably 0.5 nm or less, particularly preferably 0.3 nm. It is important to adopt a molding method capable of directly molding the following glass.
- An overflow downdraw method is an example of such a method. In the overflow downdraw method, both the light-transmitting surfaces of the glass are molded without contact with other members, so that the glass surface becomes a free surface (fire-making surface), and the glass having excellent surface quality as described above is obtained. It can be obtained without polishing.
- the thickness of the cover glass for a semiconductor package of the present invention is preferably 0.05 to 0.7 mm. As the wall thickness increases, it becomes an obstacle to weight reduction, and when it exceeds 0.7 mm, the distance from the solid-state imaging device becomes too close, and display defects may easily occur. On the other hand, if the thickness is less than 0.05 mm, the practical strength may be insufficient, or the deflection of the large plate glass may increase, making handling difficult.
- a preferable thickness is 0.1 to 0.5 mm.
- a glass raw material formulation is prepared so as to obtain a glass having a desired composition and characteristics.
- the target glass composition and characteristics are as described above, and will not be described here.
- a high-purity raw material with few impurities such as U and Th is used. More specifically, the high-purity raw material is selected so that the U content is 100 ppb or less (preferably 20 ppb or less) and the Th content is 200 ppb or less (preferably 40 ppb or less).
- the prepared glass material is put into a melting tank and melted.
- a platinum container may be used for the melting tank, it is better not to use it if possible because platinum particles are easily mixed in the glass.
- at least the inner walls (ceiling, side surfaces, and bottom surface) of the melting tank are made of refractories with less U and Th.
- alumina refractories for example, alumina-based electrocast bricks
- quartz refractories for example, silica blocks
- the homogenized molten glass is formed into a plate shape by the overflow down draw method to obtain a plate glass having a desired thickness.
- the cover glass is produced by chopping the plate glass thus obtained into a predetermined size and chamfering as necessary.
- the package cover glass thus obtained employs a high-purity raw material and a molten environment prepared so that impurities are hardly mixed while having the above basic composition. Therefore, desired characteristics can be obtained, and the contents of U, Th, Fe 2 O 3 , PbO, TiO 2 , ZrO 2 and the like can be precisely controlled.
- cover glass for a package of the present invention will be described based on examples.
- Tables 1 and 2 show examples (sample Nos. 1 to 11) of the cover glass for a package of the present invention.
- a high-purity glass raw material prepared so as to have the composition shown in the table is put into a crucible made from any of platinum rhodium, alumina, and quartz, and the conditions of 1550 ° C. and 6 hours in an electric melting furnace having a stirring function
- the molten glass was poured out onto a carbon plate. Furthermore, this plate glass was gradually cooled to obtain a glass sample, which was subjected to various evaluations.
- each glass sample satisfied the conditions required for the cover glass for semiconductor packages in terms of density, thermal expansion coefficient, and ⁇ -ray emission amount. Moreover, since the temperature corresponding to the viscosity of 10 2.5 dPa ⁇ s is 1520 ° C. or lower, the meltability is excellent, the liquidus temperature is 1025 ° C. or lower, and the liquid phase viscosity is 10 5.0 dPa ⁇ s or higher. Therefore, it was confirmed that it was excellent in devitrification resistance and could be molded by the overflow down draw method.
- the contents of U and Th were measured by ICP-MASS.
- the density was measured by the well-known Archimedes method.
- As the thermal expansion coefficient an average thermal expansion coefficient in a temperature range of 30 to 380 ° C. was measured using a dilatometer.
- Young's modulus was measured by the resonance method. The specific Young's modulus was calculated from the Young's modulus and density measured by the bending resonance method.
- the liquidus temperature is obtained 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 devitrifying (crystallizing) inside the glass sample by microscopic observation.
- the maximum temperature at which foreign matter) was observed was measured, and that temperature was defined as the liquidus temperature.
- the viscosity of the glass at the liquidus temperature was defined as the liquidus viscosity.
- the strain point and annealing point were measured according to the method of ASTM C336-71, and the softening point was measured according to the method of ASTM C338-93.
- the 10 4 dPa ⁇ s temperature, the 10 3 dPa ⁇ s temperature, and the 10 2.5 dPa ⁇ s temperature were determined by a well-known platinum ball pulling method.
- the 10 2.5 dPa ⁇ s temperature is obtained by measuring a temperature corresponding to a high temperature viscosity of 10 2.5 dPa ⁇ s, and the lower this value, the better the meltability.
- the amount of ⁇ -ray emission was measured using an ultra-low level ⁇ -ray measuring device (LACS-4000M manufactured by Sumitomo Chemical Co., Ltd.).
- the acid resistance was defined as the weight per unit area of the sample changed before and after the test by immersing the glass sample in 10% hydrochloric acid at 80 ° C. for 24 hours.
- the cover glass of each example has a surface roughness (Ra) of the first light-transmitting surface and the second light-transmitting surface of 0.23 nm or less, and has a very good smooth surface.
- the cover glass for a package of the present invention is suitable as a cover glass for a solid-state imaging device package, and besides this, it can be used as a cover glass for various semiconductor packages including a package containing a laser diode. Further, since this cover glass has an average coefficient of thermal expansion of 90 to 180 ⁇ 10 ⁇ 7 / ° C. in the temperature range of 30 to 380 ° C., in addition to the plastic package, resin, Kovar alloy, molybdenum alloy, 42Ni—Fe The present invention can be applied to various packages made of an alloy, 45Ni—Fe alloy or the like.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
「平均熱膨張係数」は、ディラトメーターを用いて測定した30~380℃の温度範囲における平均熱膨張係数を意味する。「ヤング率」は共振法により測定した値を意味する。「α線放出量」は、超低レベルα線測定装置(住友化学社製LACS-4000M)を用いて測定した値である。
耐酸性は80℃の10%濃度塩酸に24時間ガラス試料を浸漬し、試験前後に変化した試料の単位面積当たりの重量とした。
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
本出願は、2010年9月9日出願の日本特許出願(特願2010-201630)に基づくものであり、その内容はここに参照として取り込まれる。
Claims (12)
- 質量%で、SiO2 58~75%、Al2O3 1.1~20%、B2O3 0~10%、Na2O 0.1~20%、K2O 0~11%、アルカリ土類金属酸化物 0~20%含有し、30~380℃の温度範囲における平均熱膨張係数が90~180×10-7/℃、ヤング率が68GPa以上、ガラスからのα線放出量が、0.05c/cm2・hr以下であることを特徴とする半導体パッケージ用カバーガラス。
- ガラス中のU含有量が100ppb以下、Th含有量が200ppb以下であることを特徴とする請求項1に記載の半導体パッケージ用カバーガラス。
- ZrO2、As2O3及びBaOを実質的に含有しないことを特徴とする請求項1又は2に記載の半導体パッケージ用カバーガラス。
- アルカリ金属酸化物およびアルカリ土類金属酸化物の合量が21~35質量%であることを特徴とする請求項1~3の何れかに記載の半導体パッケージ用カバーガラス。
- 液相温度におけるガラス粘度が104.7dPa・s以上であることを特徴とする請求項1~4の何れかに記載の半導体パッケージ用カバーガラス。
- 未研磨の表面を有することを特徴とする請求項1~5の何れかに記載の半導体パッケージ用カバーガラス
- 質量基準で、SiO2/(Al2O3+K2O)の比が1~12であることを特徴とする請求項1~6の何れかに記載の半導体パッケージ用カバーガラス。
- 質量基準で、(Na2O+K2O)/Na2Oの比が1.1~10であることを特徴とする請求項1~7の何れかに記載の半導体パッケージ用カバーガラス。
- CMOS用プラスチックパッケージに使用されることを特徴とする請求項1~8の何れかに記載の半導体パッケージ用カバーガラス。
- 質量%で、SiO2 58~75%、Al2O3 1.1~20%、B2O3 0~10%、Na2O 0.1~20%、K2O 0~11%、アルカリ土類金属酸化物 0~20%含有し、30~380℃の温度範囲における平均熱膨張係数が90~180×10-7/℃、ヤング率が68GPa以上となるようにガラス原料を調製し、溶融した後、オーバーフローダウンドロー法を用いて板状に成形するとともに、ガラスからのα線放出量が0.05c/cm2・hr以下となるようにガラス原料及び溶融設備の選択を行うことを特徴とする半導体パッケージ用カバーガラスの製造方法。
- ガラス中のU含有量が100ppb以下、Th含有量が200ppb以下となるように、原料バッチの選択及び溶融条件の調節を行うことを特徴とする請求項10に記載の半導体パッケージ用カバーガラスの製造方法。
- ZrO2、As2O3及びBaOを実質的に含有しないバッチを使用することを特徴とする請求項10又は11に記載の半導体パッケージ用カバーガラスの製造方法。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/821,622 US9269742B2 (en) | 2010-09-09 | 2011-09-08 | Cover glass for semiconductor package and production method thereof |
| CN2011800437198A CN103097317A (zh) | 2010-09-09 | 2011-09-08 | 半导体封装用防护玻璃及其制造方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010201630 | 2010-09-09 | ||
| JP2010-201630 | 2010-09-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012033161A1 true WO2012033161A1 (ja) | 2012-03-15 |
Family
ID=45810757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2011/070480 Ceased WO2012033161A1 (ja) | 2010-09-09 | 2011-09-08 | 半導体パッケージ用カバーガラス及びその製造方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9269742B2 (ja) |
| JP (1) | JP5909937B2 (ja) |
| CN (1) | CN103097317A (ja) |
| WO (1) | WO2012033161A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976610A (zh) * | 2012-11-30 | 2013-03-20 | 东旭集团有限公司 | 一种触屏盖板用玻璃配方 |
| CN102976611A (zh) * | 2012-11-30 | 2013-03-20 | 东旭集团有限公司 | 一种轻质触摸屏用盖板玻璃的配方 |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6051399B2 (ja) * | 2014-07-17 | 2016-12-27 | 関根 弘一 | 固体撮像装置及びその製造方法 |
| CN105859129B (zh) * | 2016-04-07 | 2019-03-19 | 东旭科技集团有限公司 | 一种玻璃用组合物和玻璃及其制备方法和应用 |
| DE102016123000B3 (de) * | 2016-11-29 | 2017-12-14 | Scansonic Mi Gmbh | Verfahren zur Überwachung eines Schutzglases und Überwachungsvorrichtung |
| DE102017102482B4 (de) | 2017-02-08 | 2019-11-21 | Schott Ag | Gläser mit verbesserter Ionenaustauschbarkeit und thermischer Ausdehnung |
| CN106904953B (zh) * | 2017-03-24 | 2021-01-01 | 电子科技大学 | 高密度封装用高热膨胀系数陶瓷材料及其制备方法 |
| JP7280546B2 (ja) * | 2017-11-09 | 2023-05-24 | 日本電気硝子株式会社 | ガラス板及びこれを用いた波長変換パッケージ |
| WO2025131403A1 (en) | 2023-12-21 | 2025-06-26 | Schott Ag | Glasses for local index modification by ion exchange and devices comprising the same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07215734A (ja) * | 1994-01-28 | 1995-08-15 | Nippon Electric Glass Co Ltd | 固体撮像素子用カバーガラス |
| JP2005200289A (ja) * | 2003-08-04 | 2005-07-28 | Nippon Electric Glass Co Ltd | 固体撮像素子用カバーガラス及びその製造方法 |
| JP2007311454A (ja) * | 2006-05-17 | 2007-11-29 | Sony Corp | 固体撮像装置 |
| JP2008013421A (ja) * | 2005-07-14 | 2008-01-24 | Nippon Electric Glass Co Ltd | 平面表示装置用ガラススペーサー及びこれを用いたスペーサー |
| JP2009057271A (ja) * | 2007-08-03 | 2009-03-19 | Nippon Electric Glass Co Ltd | 強化ガラス基板及びその製造方法 |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4298389A (en) * | 1980-02-20 | 1981-11-03 | Corning Glass Works | High transmission glasses for solar applications |
| JPS6058182B2 (ja) * | 1980-04-14 | 1985-12-18 | 日本電気硝子株式会社 | ガラス組成物 |
| US4309507A (en) * | 1981-02-23 | 1982-01-05 | Motorola, Inc. | Glass and hermetic seal |
| JPH11224649A (ja) * | 1998-02-10 | 1999-08-17 | Matsushita Electron Corp | ランプ用ガラス組成物、ランプ用ステムおよびランプ用バルブ |
| JP3902333B2 (ja) * | 1998-06-24 | 2007-04-04 | 日本電気硝子株式会社 | リードスイッチ用赤外線吸収ガラス |
| US6534346B2 (en) * | 2000-05-16 | 2003-03-18 | Nippon Electric Glass Co., Ltd. | Glass and glass tube for encapsulating semiconductors |
| US6949485B2 (en) * | 2000-06-01 | 2005-09-27 | Asabi Glass Company, Limited | Glass for substrate and glass substrate |
| JP4785274B2 (ja) * | 2001-05-29 | 2011-10-05 | 日本板硝子株式会社 | ガラス物品およびそれを用いた磁気記録媒体用ガラス基板 |
| JP3995902B2 (ja) * | 2001-05-31 | 2007-10-24 | Hoya株式会社 | 情報記録媒体用ガラス基板及びそれを用いた磁気情報記録媒体 |
| EP1466875A3 (en) | 2003-04-09 | 2007-05-30 | Hoya Corporation | Glass for window of semiconductor package, glass window for semiconductor package, process for production of glass window, and semiconductor package |
| JP4433391B2 (ja) | 2003-04-09 | 2010-03-17 | Hoya株式会社 | 半導体パッケージの窓用ガラス、半導体パッケージ用ガラス窓および半導体パッケージ |
| JP2005162600A (ja) * | 2003-11-11 | 2005-06-23 | Nippon Electric Glass Co Ltd | 半導体パッケージ用カバーガラス |
| JP4371841B2 (ja) * | 2004-02-09 | 2009-11-25 | Hoya株式会社 | 半導体パッケージ用窓材ガラス |
| DE102005052421A1 (de) * | 2005-11-03 | 2007-05-16 | Schott Ag | Verfahren zur Herstellung von Abdeckgläsern für strahlungsempfindliche Sensoren und Vorrichtung zur Durchführung des Verfahrens |
| DE102005052420A1 (de) * | 2005-11-03 | 2007-05-10 | Schott Ag | Strahlungsarme Abdeckgläser und deren Verwendung |
| JP5875133B2 (ja) * | 2006-10-10 | 2016-03-02 | 日本電気硝子株式会社 | 強化ガラス基板 |
| JP5743125B2 (ja) * | 2007-09-27 | 2015-07-01 | 日本電気硝子株式会社 | 強化ガラス及び強化ガラス基板 |
| KR20110050522A (ko) * | 2008-08-21 | 2011-05-13 | 코닝 인코포레이티드 | 전자 장치용 내구성 유리 하우징/인클로저 |
| JP5429684B2 (ja) * | 2008-11-11 | 2014-02-26 | 日本電気硝子株式会社 | 強化ガラス基板及びその製造方法 |
| JP5622069B2 (ja) * | 2009-01-21 | 2014-11-12 | 日本電気硝子株式会社 | 強化ガラス、強化用ガラス及び強化ガラスの製造方法 |
| US8647995B2 (en) * | 2009-07-24 | 2014-02-11 | Corsam Technologies Llc | Fusion formable silica and sodium containing glasses |
-
2011
- 2011-09-07 JP JP2011194600A patent/JP5909937B2/ja active Active
- 2011-09-08 CN CN2011800437198A patent/CN103097317A/zh active Pending
- 2011-09-08 US US13/821,622 patent/US9269742B2/en active Active
- 2011-09-08 WO PCT/JP2011/070480 patent/WO2012033161A1/ja not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07215734A (ja) * | 1994-01-28 | 1995-08-15 | Nippon Electric Glass Co Ltd | 固体撮像素子用カバーガラス |
| JP2005200289A (ja) * | 2003-08-04 | 2005-07-28 | Nippon Electric Glass Co Ltd | 固体撮像素子用カバーガラス及びその製造方法 |
| JP2008013421A (ja) * | 2005-07-14 | 2008-01-24 | Nippon Electric Glass Co Ltd | 平面表示装置用ガラススペーサー及びこれを用いたスペーサー |
| JP2007311454A (ja) * | 2006-05-17 | 2007-11-29 | Sony Corp | 固体撮像装置 |
| JP2009057271A (ja) * | 2007-08-03 | 2009-03-19 | Nippon Electric Glass Co Ltd | 強化ガラス基板及びその製造方法 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976610A (zh) * | 2012-11-30 | 2013-03-20 | 东旭集团有限公司 | 一种触屏盖板用玻璃配方 |
| CN102976611A (zh) * | 2012-11-30 | 2013-03-20 | 东旭集团有限公司 | 一种轻质触摸屏用盖板玻璃的配方 |
Also Published As
| Publication number | Publication date |
|---|---|
| US9269742B2 (en) | 2016-02-23 |
| JP2012076991A (ja) | 2012-04-19 |
| US20130165312A1 (en) | 2013-06-27 |
| CN103097317A (zh) | 2013-05-08 |
| JP5909937B2 (ja) | 2016-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5909937B2 (ja) | 半導体パッケージ用カバーガラス及びその製造方法 | |
| US20210179479A1 (en) | Optical glass and optical component | |
| JP6604337B2 (ja) | ガラス基板、積層基板、およびガラス基板の製造方法 | |
| KR101446971B1 (ko) | 무알칼리 유리 | |
| JP5378158B2 (ja) | 半導体パッケージ用カバーガラス | |
| US20180194671A1 (en) | Optical glass and optical component | |
| US12304857B2 (en) | Glass substrate, semiconductor device, and display device | |
| CN100418911C (zh) | 半导体封装用覆层玻璃 | |
| JP2006137631A (ja) | ガラス基板及びその製造方法 | |
| JP7287524B2 (ja) | 無アルカリガラス基板、積層基板、およびガラス基板の製造方法 | |
| JP5234387B2 (ja) | 無アルカリガラスおよび無アルカリガラス基板並びにその製造方法 | |
| KR101015428B1 (ko) | 반도체 패키지용 커버 유리 | |
| JP2005126320A (ja) | 固体撮像素子パッケージ用窓ガラス | |
| CN100390968C (zh) | 半导体封装体用外罩玻璃及其制造方法 | |
| JP5348598B2 (ja) | 半導体素子用ガラス基板およびそれを用いたチップスケールパッケージ | |
| JP2005008509A (ja) | 光半導体パッケージ用カバーガラス及びその製造方法 | |
| JP5467538B2 (ja) | 半導体素子用ガラス基板およびそれを用いたチップスケールパッケージ | |
| JP2002249323A (ja) | 半導体パッケージ用カバーガラス及びその製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WWE | Wipo information: entry into national phase |
Ref document number: 201180043719.8 Country of ref document: CN |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11823635 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 13821622 Country of ref document: US |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 11823635 Country of ref document: EP Kind code of ref document: A1 |


