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|1. (WO2018010235) FOCUSING DEVICE FOR PROJECTION LENS|
|Applicants:||IVIEW DISPLAYS (SHENZHEN) COMPANY LTD.
|Title:||FOCUSING DEVICE FOR PROJECTION LENS|
Disclosed is a focusing device for a projection lens, comprising: a front lens group barrel (10), a rear lens group barrel (20), an outer sleeve (30) with a flange, an adjustment slider (40), an adjustment deflector rod (50), limiting posts (60) and guide posts (70). The front lens group barrel is provided with a first limiting surface (S1); the rear lens group barrel is provided with a movable groove (21), and a first limiting hole (23) and a first guide post hole (22); and the outer sleeve is provided with a slant annular groove (31), a second limiting hole (33), a second guide post hole (32), and a second limiting surface (S2). The focusing device for a projection lens has a simple focusing structure, makes focusing easy and quick, can achieve changes in the relative position of a front lens group and a rear lens group, has a better resolution of scenes at different positions, is more stable, and can quickly and accurately adjust the focal length to achieve desired projection effects.