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    • 6. 发明授权
    • Bi-level focusing plate of phase grating type
    • 相位光栅类型的双层聚焦板
    • US4697878A
    • 1987-10-06
    • US706962
    • 1985-02-28
    • Kazuo KimuraTetsuyuki TanimotoHiroshi Kobayashi
    • Kazuo KimuraTetsuyuki TanimotoHiroshi Kobayashi
    • G03B13/24G02B5/18G02B7/28G02B27/40
    • G02B7/28G02B27/40G02B5/1871
    • There is disclosed a bi-level focusing plate of phase grating type in which micro unit patterns, each of which is comprised of one or more projections and one or more recessions, are arranged regularly and repeatedly at a pitch of 10 to 30 .mu.m. The phase difference between each of projections and each of recessions is set at .pi. radian against a light having a wavelength of 400 to 700 nm and the ratio in area of total area of projections or recessions in one unit pattern to the area of said one unit pattern is set so as to fall into a range of 0.3 to 0.5. The focusing plate is characterized in that the boundaries in each unit pattern each defined between the projection and the recession adjacent to each other therein are comprised of straight-lined portions and curved portions.
    • 公开了一种相位光栅类型的双电平聚焦板,其中每个由一个或多个突起和一个或多个凹部组成的微单元图案以10至30μm的间距规则地和重复地布置。 每个突起和每个凹陷之间的相位差被设置为相对于波长为400至700nm的光的pi弧度,并且将一个单位图案中的突起或凹陷的总面积的面积与所述一个单位的面积 图案设定为0.3〜0.5的范围。 聚焦板的特征在于,每个单元图案中的每个限定在彼此相邻的突起和凹陷之间的边界由直线部分和弯曲部分组成。