Surface roughness Ra 3nm, shape accuracy PV 1μm. High precision is achievable even in large sizes.
Crystal optics enables the production of ultra-large freeform mirrors. Freeform shapes are complex and non-rotationally symmetric surfaces that cannot be represented by simple mathematical formulas, unlike spherical or rotationally symmetric aspheric surfaces. There is a growing demand for precise lenses and mirrors with freeform shapes as components in optical systems for light collection and projection, such as in the fields of astronomy and automotive mirrors. At Crystal Optics, we have determined appropriate processing conditions for these ultra-large freeform shapes and successfully demonstrated the performance of the Nanoform 700 ultra processing machine using slotted tool servo processing, achieving success in areas that even processing machine developers have never experienced.
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basic information
○Surface roughness Ra 3nm, shape accuracy PV 1μm Surface roughness measured with NEWVIEW (Zygo), shape accuracy measured with UA3P (Panasonic). (Shape measurement cannot be evaluated over the entire surface, so it is evaluated in segments.) ○Processing machine Nanoforn 700 ultra (Precitech) Freeform surface manufacturing using slow tool servo processing. (Slow tool servo processing is a method of machining asymmetric curved surfaces (freeform surfaces) by synchronizing the spindle's rotational angle (C-axis) with the tool coordinates (XZ-axis). Normally, a lathe with XZ two axes can only machine surfaces symmetrical to the rotation axis.)
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Applications/Examples of results
Astronomical fields and vehicle-mounted mirrors.
Company information
Our company, at the time of its founding, was engaged in the hand polishing of optical single crystals. Among optical crystal materials, there are extremely delicate materials that can only be polished in environments with strict control of temperature and humidity. Based on this polishing technology, we have been involved in the polishing of various materials up to the present day. Now, after 30 years, we have expanded our capabilities to handle not only single crystals but also all kinds of materials including metals, non-metals, and ceramics. Initially, we processed small components that could fit in the palm of a hand, but today we are capable of handling ultra-large components up to 8000mm. In terms of our business (processing), we are focusing on in-house integrated production to achieve higher precision processing. We have established six fields: cutting, grinding, polishing, ultra-precision processing, surface treatment (non-conductive treatment/electropolishing), and measurement, allowing our customers to provide just one drawing and entrust all processing to us. In November 2014, with the aim of engaging in the aerospace industry, we introduced two new 5-axis composite machining centers, and we will do our utmost to contribute to the aerospace industry, which promotes the evolution of space.
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