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    • 6. 发明授权
    • Optical device
    • 光学装置
    • US06765704B2
    • 2004-07-20
    • US10312320
    • 2003-04-07
    • John Drinkwater
    • John Drinkwater
    • G03H100
    • B42D25/328B42D2035/34G03H1/0011G03H1/0891G03H1/26G03H1/265G03H2001/0016G03H2001/0413G03H2001/2223G03H2001/2231G03H2001/2255G03H2001/2273G03H2001/2665G03H2210/20G03H2210/52
    • An optical device for security and anti-counterfeit applications comprises a holographic diffractive structure (8) that generates a holographic optically variable image by diffraction that consists of at least two separate substantially co-located linear regions that generate in response to white light illumination a visually observable holographic image consisting of at least two defined graphical elements and which generates in response to coherent illumination (1) at least two covert images (5, 6, 7) focussed at a separate image plane a distance away from the real physical plane of the device, each covert image (5, 6, 7) corresponding to the replay from one of the linear regions, each covert image (5, 6, 7) being separated on its image plane from the adjacent covert image (5, 6, 7) by at least its own dimensions.
    • 用于安全和防伪应用的光学装置包括全息衍射结构(8),该全息衍射结构(8)通过衍射产生全息光学可变图像,该图像由至少两个基本上共同定位的线性区域组成,该区域响应于白光照明而产生视觉 可观测的全息图像由至少两个限定的图形元素组成,并且响应于相干照明而产生至少两个隐蔽图像(5,6,7),所述至少两个隐蔽图像(5,6,7)聚焦在离开该物理平面 每个隐蔽图像(5,6,7)在其图像平面上与相邻的隐蔽图像(5,6,7)分离,每个隐蔽图像(5,6,7)对应于来自一个线性区域的重放, )至少自己的尺寸。