| http://www.w3.org/ns/prov#value | - The lens 21 is a drum lens, which formed by grinding a spherical lens. (Mounting a drum lens is easier than fixing a spherical lens.)The assembled input/output ports A, B, C, D, COM are fixed on a substrate 27 using oblique spacers 28 as shown in FIGS. 4A and 4B. Moreover, the block 1 is fixed onto the substrate 27 using a mounting member 29, which is screwed into thesubstrate 27 using screws 33.
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