Juken Kogyo Co., Ltd.

Japan

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Juken Kogyo Co., Ltd. (株式会社樹研工業) is a Japanese specialist in ultra-precision micro injection molding and micro-machining, founded in 1965 and based in Toyohashi, Aichi Prefecture. Operating under the philosophy of serving as a bridge between craftsmanship and engineering science, the company is globally noted for pioneering sub-milligram injection-molded components and microscopic powder gears.

Juken operates production and mold fabrication facilities in Toyohashi (Jinno Factory) and Miyagi, alongside international operations across Asia. The company houses vibration-isolated facilities with temperature control held to ±0.05°C, enabling nanometer-level mold machining and duplication for microfluidic, MEMS, medical, and optical applications.

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Juken Kogyo specializes in microscopic plastic molding and ultra-precision tool fabrication:

Micro Injection Molding: High-volume manufacturing of micro plastic parts, including powder-sized gears weighing 1/1,000,000 g, 1/100,000 g, and 1/10,000 g with tight tolerances.
Ultra-Precision Machining Centers: 5-axis simultaneous control machining centers powered by linear motors with sub-nanometer linear encoders, capable of direct machining of free-form surfaces and optical microstructures.
Ultra-Precision Mold Making: Mold tooling produced using mono-crystal diamond cutters, achieving nanometer-order surface roughness directly on mold cavities without manual polishing.
MEMS, Medical & Optical Applications: Micro actuators, micro lenses, Fresnel lenses, fly-eye lens arrays, micro-needles, and precision plastic components for genetic medical treatment, medical diagnostics, and semiconductor handling.

Juken Kogyo Co., Ltd.

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