ovd

Design of printing system with needle-type grating head for OVD'S

针式光栅头光学可变图像打印系统的设计

The technology to make a large area master with the grating of optically variable device ( OVD) is role in holographic image embossing.

制作具有光变图像（OVD）光栅条纹的大面积全息原版，是激光图像无油墨印刷的核心技术之一。

The results show that the diffraction efficiency of transferred OVD can be higher than that of original shim.

对复制前后的光变图像光栅进行的测试表明，转移后光栅的衍射效率可以高于母光栅。

Graphics oriented design ( GOD) is also proposed to realize achromatic OVD and the fabricated examples are also given.

此外，还提出了面向图形结构的非彩色OVD实现方案，并给出了实验结果。

OVD process in optical fiber fabrication

光纤制备中的外汽相沉积工艺研究

The required thickness ( 0.6-0.8 μ m) of SOS film is deposited by the standard OVD method on the thin silicon layer.

3）再用通常CVD方法在带薄硅层上外延生长所需厚度（0.6～0.8μm）的SOS膜。

In this article we introduce the manufacture methods, measurements, applications of Optical Variable Device ( OVD) being based on our research working recently.

作者结合近几年的研究工作，介绍并探讨了光可变材料的研制方法，测试方法及应用。