CN 118534627 A — Kuang Jian, Ouyang Xia, Ye Bo, Li Zenghui, Liu Xiaojuan
| 8 ELEMENTS / 6 GROUPS |
| DESIGN f = 21.73 mm |
| DESIGN F/3.5 |
| 2 ASPHERICAL SURFACES / 1 ELEMENT |
PUBLISHED: unit focus. G1, the stop and G2 move together 0.96 mm toward the object (D15 16.71 to 17.67 mm); the cover glass and image plane stay fixed. The patent's near state is 500 mm from the object to the first lens vertex, which is 0.554 m from object to image with the 53.80 mm near track. The manufacturer's 0.5 m minimum is measured from the sensor plane and is a different reference. Positions between the two published states are interpolated by the app, not a published cam law. The two-decimal source indices leave a small residual defocus at both states.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | Unmatched (low-dispersion crown) |
| L2 | Positive Meniscus | Unmatched (high-index flint) |
| L3 | Biconcave Negative | Unmatched (dense flint) |
| L4 | Biconvex Positive | Unmatched (lanthanum flint) |
| L5 | Biconvex Positive | Unmatched (high-index flint) |
| L6 | Biconvex Positive | Unmatched (high-index crown) |
| L7 | Biconcave Negative | Unmatched (dense flint) |
| L8 | Positive Meniscus (2× Asph) | Unmatched (crown) |