| 摘要 |
PCT No. PCT/GB88/00842 Sec. 371 Date Nov. 13, 1989 Sec. 102(e) Date Nov. 13, 1989 PCT Filed Oct. 7, 1988 PCT Pub. No. WO89/03539 PCT Pub. Date Apr. 20, 1989.A lens assembly for focussing the light output of a device (2) on to a target (4), when there is relative movement between the target and device. The assembly comprises a pair of lenses with the device at the focus of the first and the target in the focal range of the second lens.
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