• Title/Summary/Keyword: System-on-Glass

Search Result 1,535, Processing Time 0.028 seconds

A Study on the development of Automated Optical Glass Inspection System (광학용 유리자동검사기 개발에 관한 연구)

  • 구마끼
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1998.03a
    • /
    • pp.82-87
    • /
    • 1998
  • Laser printer, faximile and copy machine are a few examples of OA(office automation) system. In such a system, the reflecting mirror has been employed for transmitting a target image to optical device. Therefore, to develope a good quality of optical system, the quality control of optical mirror was required. In recent years, considerable efforts have been directed toward the development of automated optical glass inspection system because the inspection is eye-fatigue and monotonous job for humans to perform. In this paper, we propose a inspection system applying algorithm of image processing for detecting defects of optical glass such as pinhole, scratch. From the experiments, the proposed inspection system shows reliable results.

  • PDF

Effect of TiO2 on the Properties of ZnO-V2O5-P2O5 Low Temperature Sealing Glasses (저온실링용 ZnO-V2O5-P2O5계 봉착재의 물성에 미치는 TiO2 의 영향)

  • Lee, Heon-Seok;Hwang, Jong-Hee;Lim, Tae-Young;Kim, Jin-Ho;Lee, Suk-Hwa;Kim, Il-Won;Kim, Nam-Suk;Kim, Hyung-Sun
    • Korean Journal of Materials Research
    • /
    • v.19 no.11
    • /
    • pp.613-618
    • /
    • 2009
  • We designed new compositions for lead free and low temperature sealing glass frit of $ZnO-V_2O_5-P_2O_5$ system, which can be used for PDP (Plasma Display Panel) or other electronic devices. The $ZnO-V_2O_5-P_2O_5$ system can be used as a sealing material at temperatures even lower than 430$^{\circ}C$. This system, however, showed lower bonding strength with glass substrate compared to commercialized Pb based sealing materials. So, we added $TiO_2$ as a promoter for bonding strength. We examined the effect of $TiO_2$ addition on sealing behaviors of $ZnO-V_2O_5-P_2O_5$ glasses with the data for flow button, wetting angle, temporary & permanent residual stress of glass substrate, EPMA analysis of interface between sealing materials and glass substrate, and bonding strength. As a result, sealing characteristics of $ZnO-V_2O_5-P_2O_5$ system glasses were improved with $TiO_2$ addition, but showed a maximum value at 5 mol% $TiO_2$ addition. The reason for improved bonding characteristics was considered to be the chemical interaction between glass substrate and sealing glass, and structural densification of sealing glass itself.

Effect of Unidirectional Carbon Fiber Sheet Manufacturing Process Using Coated Glass Fiber and Carbon Fiber on Concrete Reinforcement (유리섬유 코팅사와 탄소섬유를 이용한 일방향 탄소섬유시트 제조공정이 콘크리트 보강에 미치는 영향)

  • Kwon, Jieun;Kwon, Sunmin;Chae, Seehyeon;Jeong, Yedam;Kim, Jongwon
    • Textile Coloration and Finishing
    • /
    • v.34 no.3
    • /
    • pp.185-196
    • /
    • 2022
  • In this study, carbon fiber and coated glass fiber are applied to warp and weft fiber in order to reduce the amount of carbon fiber used in carbon fiber fabrics, which are often used for reinforcement of building structures. A low-cost thermoplastic resin was coated on glass fibers to prepare a shape-stabilizing glass fiber. A unidirectional carbon fiber sheet was manufactured using the prepared coated glass fiber and carbon fiber. In order to identify whether it can be used for reinforcing architectural and civil structures, it was attached to a concrete specimen and its mechanical properties were analyzed. The optimum manufacturing conditions for the coated glass fiber were 0.3 mm in diameter of the coating nozzle, the coating temperature was 190 ℃, and the coating speed was 0.3 m/s. 14 mm was optimal for the weft spacing of the coated glass fiber. The flexural strength of the concrete reinforced with the manufactured unidirectional carbon fiber sheet was slightly lower than that of the concrete reinforced with carbon fiber fabric, but it was confirmed that the reinforcement effect was better when the amount of carbon fiber was considered.

A study on the characteristic of hydration reaction in $CaO-Al_2O_3-SiO_2$ system glass ($CaO-Al_2O_3-SiO_2$계 유리의 수화반응특성)

  • 조재우;김승진;김영근;손진군
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1999.10a
    • /
    • pp.289-292
    • /
    • 1999
  • The charateristic of hydration reaction was studied in CaO-Al2O3-SiO2 system glass. As a result, the rate of heat liberation curves of synthestized glass becomes fixed after having increased by degrees. And it is decreasing after having increased suddenly. It was found that the total heat liberation with hydration for synthesized glass has a close relationship with the formation amount of ettringite.

  • PDF

A Study on Glass Processing System

  • Song, Jai-Chul
    • International journal of advanced smart convergence
    • /
    • v.4 no.2
    • /
    • pp.84-93
    • /
    • 2015
  • This study is for the development of Cover Glass Grinding Processing System. This system is developed for manufacturing a mass product system grinding cover glasses with highly precise mechanism, and we improved resulted quality. In the development process, we developed a complete process technology through mechanical design, image processing technology, spindle control, mark identification algorithm etc. With this cover glass grinding development, we could developed process technology, image processing technology, organization mechanisms and control algorithms.

Thermal properties of glass-ceramics made with zircon and diopside powders

  • Lee, Dayoung;Kang, Seunggu
    • Journal of Ceramic Processing Research
    • /
    • v.19 no.6
    • /
    • pp.504-508
    • /
    • 2018
  • Diopside is a ceramic material with excellent physical and chemical properties. However, when it is applied as an LED packaging material, heat dissipation of the LED element is not sufficient due to its relatively lower thermal conductivity, which may cause degradation of the LED function. In this study, glass-ceramics based on a $ZrO_2-CaO-MgO-SiO_2$ system, in which diopside is the main crystal phase, were prepared by heat-treating the glass, which was composed of zircon ($ZrO_2-SiO_2$) powders and diopside ($CaO-MgO-2SiO_2$) powders. The possibility of using the glass-ceramics as a packaging material for LEDs was then investigated by analyzing the density, shrinkage, thermal conductivity, and phases generated according to the amount of zircon powder added. The density and shrinkage of specimens decreased slightly and then increased again with the amount of $ZrO_2-SiO_2$ added within a range of 0~0.38 mol. Even though the crystal phase of zircon does not appear in the $ZrO_2-CaO-MgO-SiO_2$ system, the glass containing 0.38 mol zircon powder showed the highest thermal conductivity, 1.85 W/mK, among the specimens fabricated in this study: this value was about 23% higher than that of pure diopside. It was found that the thermal conductivity of the glass-ceramics based on a $ZrO_2-CaO-MgO-SiO_2$ system was closely related to the density, but not to the phase type. Zirconia ($ZrO_2$), a component oxide of zircon, plays an important role in increasing the density of the specimen. Furthermore the thermal conductivity of glass-ceramics based on a $ZrO_2-CaO-MgO-SiO_2$ system showed a nearly linear relationship with thermal diffusivity.

Experimental Study on Interaction of Water Sprayed Curtain on Hot Surface of a Window Glass and its Effects on Glass Surface Temperature in Room Fires (구획화재 시 국부복사열에 노출된 유리면의 수막접촉에 따른 급냉파열특성 관한 실험적 연구)

  • 박형주;지남용
    • Fire Science and Engineering
    • /
    • v.17 no.4
    • /
    • pp.124-130
    • /
    • 2003
  • This research focuses on analysis of a interaction fracture of various glasses due to contact of water sprayed curtain on hot glass surface with high temperature produced from convective heat source near glass wall. A large scaled experimental test was done in order to find the range of the glass surface temperature to be able to cause the breakage of the glasses when water droplets reach on the hot surface. This paper shows the allowable temperature of the glass surface for prevention of the cooling down breakage before water curtain droplets contact the surface. Allowable Temperature if $250^{\circ}C$ for the tempered glass but general glass is very relatively low. Therefore if the water curtain spray system was adequately activated by a thermal detector installed below ceiling adjacent glass wall with water curtain nozzle system, all hot glass would not break out by cooling water droplet's contact on the hot surface due to convective heat released by adjacent fire source near the glass wall.

Analysis of resistor matching and poly-Si TFT characteristics for the implementation of System-on-Glass using the existing analog circuits (System-on-Glass를 구현하기 위한 저항 matching 및 poly-Si TFT특성을 기존 아날로그 회로를 이용하여 분석)

  • Kim Dae-June;Lee Kyun-Lyeol;Yoo Changsik
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.42 no.2 s.332
    • /
    • pp.15-22
    • /
    • 2005
  • Using the existing analog circuits, required resistor matching and Poly-Si TFT characteristics are investigated for the implementation of analog circuits to be integrated on System-on-Glass. Matching requirements on resistor values, threshold voltage and mobility of poly-Si TFT are derived as a function of the resolution of display system. Also, the effective mobility of poly-Si TFT required for the realization of source driver is analyzed for various panel sizes.

Porous Alkali Resistance Glass Preparation of ZrO2-SiO2 System by the Sol-Gel Method (졸-겔법에 의한 내알칼리성 다공질 ZrO$_2$-SiO$_2$계 유리 제조)

  • 신대용;한상목
    • Journal of the Korean Ceramic Society
    • /
    • v.29 no.1
    • /
    • pp.35-40
    • /
    • 1992
  • Porous glass in the ZrO2-SiO2 system containing up to 30 mol% zirconia were prepared from the mixed solutions of Zr(O.nC3H7)4 and partially prehydrolyzed TEOS by the sol-gel method. Pore characteristics, physical properties and alkali resistance were investigated. The gels converted into the porous glass by heating at $700^{\circ}C$, it was found that the glass like skeleton was already made up in lower temperature regions. The specific surface area of the porous glass was 227 $m^2$/g, average mean pore size was about 19$\AA$ and porosity was 19.2%, pore characteristics and physical properties depended on heating temperature. Alkali resistance of the porous glass increased as the zirconia content increased, because of the appearance of Zr-enriched layer at glass surface.

  • PDF

Power Line Communication-based Heated Glass Temperature Control System (전력선통신을 이용한 선박 및 건축용 발열유리 온도제어 시스템)

  • Lee, Su-Hyeong;Kim, In-Dong
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.20 no.2
    • /
    • pp.105-114
    • /
    • 2015
  • Heated glasses are widely used to prevent surface condensation and freezing in ship and building windows. This study proposes a heated glass temperature control system composed of power and control circuits to control the temperature of heated glasses. The proposed temperature control system adopts a digital controller instead of a conventional analog controller. Thus, the proposed system has better characteristics, such as precise setup and control of glass temperature, setup and control of output power, and control mode change between ON/OFF and phase controls. The system can also implement multi-functional control algorithms. The control characteristics are not dependent upon external disturbances, such as ambient temperature and electrical noises. Furthermore, the proposed temperature control system utilizes the power line communication (PLC) method to control the number of heated glasses without any extra communication lines. The system proposes a new communication protocol with strong immunity to electrical switching noises. A new sensorless algorithm is used to detect the temperature of the heated glass. This study presents the design guidelines in detail and its effectiveness are confirmed by implementing a 4-kw prototype temperature control system.