Fastening for holding group of lenses has short cylinder surrounding largest-diameter lens in group and with inner projections engaging edge of lens and has smaller-diameter portion holding smaller lens

摘要

The fastening (1) for a group of lenses (4) has short cylinder surrounding the largest-diameter lens in the group. There are three equispaced inward projections (3) on the inner surface (2) of the short cylinder engaging outward projections (6) on the cylindrical edge (5) of the largest lens in the group. An inwardly-extending flange holds a smaller-diameter cylindrical portion holding a smaller lens.