| 摘要 |
A retractable frame of a projection screen, which is light weight and small, is provided to reduce the production cost. A retractable frame of a projection screen includes a case(10), a cylinder(20) having a retractable arm(21) connected to the case, a support arm(30) whose one end is connected to the cylinder, a connection member(40) provided on a support arm(52), a main retractable arm(50) including a main groove and a driving retractable arm whose one end is connected to the case, and an upper support(60) holding the other end of the support arm and one end of the main retractable arm.
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