| 摘要 |
A binoculars has lenses carried by sheet structure defining a box that is foldable between collapsed position and focus adjusting extended positions; the box in adjustable extended position having front and rear walls carrying the lenses; the box in extended position having top and bottom walls each defining fold lines, and also having left and right side walls defining fold lines; the fold lines enabling folding of the box from extended to collapsed position, during which the top and bottom walls move relatively apart and the left and right walls move relatively toward one another; the left and right side walls having fold connection to the top and bottom walls to block light entrance into the box interior in each of the referenced extended positions.
|
