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Experimental Study of the Fabrication of Chalcogenide Glass Lenses by Using Precision Glass Molding
차두환,김정호,김혜정 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.10
Although the development of small formats (640 × 480 pixel arrays) and amorphous siliconmicrobolometers has greatly decreased detector cost, another important component of a thermalcamera, the optics, still prohibit a breakthrough for high-volume commercial systems. The asphericlenses used in thermal imaging are typically made using the costly single-point diamond turning(SPDT) process with expensive single-crystal materials (Ge, ZnS, etc.). As a potential solution toreduce cost, the compression molding method using chalcogenide glass has become attractive forfabricating IR optics. The present paper reports the fabrication of a mold and a molded chalcogenideglass lens for a thermal security camera. In addition, the molded chalcogenide glass lens wasevaluated using the form error, roughness and decentration for each surface of the molded lens. From the evaluation results, we verified that the molded lens was capable of being used for thermalimaging applications.
열변형 보정을 통한 열화상카메라용 초정밀 칼코지나이드 유리렌즈 몰드성형 및 특성 평가
차두환,김정호,김혜정,Cha, Du Hwan,Kim, Jeong-Ho,Kim, Hye-Jeong 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.2
Aspheric lenses used in the thermal imaging are typically fabricated using expensive single-crystal materials (Ge and ZnS, etc.) by the costly single point diamond turning (SPDT) process. As a potential solution to reduce cost, compression molding method using chalcogenide glass has been attracted to fabricate IR optic. Thermal deformation of a molded lens should be compensated to fabricate chalcogenide aspheric lens with form accuracy of the submicron-order. The thermal deformation phenomenon of molded lens was analyzed ant then compensation using mold iteration process is followed to fabricate the high accuracy optic. Consequently, it is obvious that compensation of thermal deformation is critical and useful enough to be adopted to fabricate the lens by molding method.