| 摘要 |
PURPOSE: An HOE(Homographic Optical Element) system is provided to reduce manufacturing costs and the size of lens by using a low-priced plastic lens. CONSTITUTION: A front lens group and a rear lens group are arranged parallel to each other from an object side on the same optical axis. The front lens group has the first lens(1), the second lens(2), and the third lens(3). The first lens(1) has a positive refractive index from the object side and a convex meniscus shape. The second lens(2) has a negative refractive index and a concave shape. The third lens(3) has a positive refractive index and a convex shape. The rear lens group has the fourth lens(4) and the fifth lens(5). The fourth lens(4) has a positive refractive index and a convex shape. The fifth lens(5) has a positive refractive index and a convex shape. An iris diaphragm(10) is installed between the front lens group and the rear lens group.
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