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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 1    September 2009

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Machining characteristics of complex prism pattern on
 electroplated roll by copper
Tae-Jin JE1, Sang-Cheon PARK2, Kang-Won LEE1, Yeong-Eun YOO1, Doo-Sun CHOI1,
Kyung-Hyun WHANG1, Myung-Chang KANG3

1. Nano-Machining Laboratory Division of Nano-Mechanical Systems,
Korea Institute of Machinery and Materials, 104, Sinseongno, Youseong-Gu, Daejeon, 305-343, Korea;
2. Nano-Mechatronics Department, University of Science and Technology,
104, Sinseongno, Youseong-Gu, Daejeon, 305-343, Korea;
3. National Core Research Center for Hybrid Materials Solution, Pusan National University,
 98, Pusandaehang-no, Geumjeong-Gu, Busan, 609-735, Korea

Abstract:The BLU (back light unit) is the core component of the LCD for notebook, mobile-phone, navigation, as well as large sized TV, PID (public information display), etc. In order to enhance optical efficiency of LCD, optical films with the uniform prism patterns have been used for BLU by stacking two films up orthogonally. In this case, light interference-phenomenon occurred such as Morie, wet-out, u-turning, etc. It caused several problems such as low brightness, spots and stripes in LCD. Recently, the high-luminance micro complex prism patterns are actively studied to avoid the light interference-phenomenon and enhance the optical efficiency. In this study, the roll master to manufacture complex micro prism pattern film was machined by using the high precision lathe. The machined patterns on the roll master were 50, 45, 40, 35, 30, 25, 20, 15, 10 and 5 μm in the pitch with 25.0, 22.5, 20.0, 17.5, 15.0, 12.5, 10.0, 7.5, 5.0 and 2.5 μm in the peak height, respectively. The roll was 2 000 mm in length and 320 mm in diameter. The electroplated roll by copper and the natural single crystal diamond tool was used for machining the patterns. The cutting force was measured and analyzed for each cutting condition by using the dynamometer. The chips and the surfaces after being machined were analyzed by SEM and microscope.

 

Key words: high precision lathe; diamond tool; electroplated roll master by copper; optical film; complex prism patterns; light interference-phenomenon

ISSN 1672-7029
CN 43-1423/U

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