Patent ID: 7173773
Filing Date: 2007-02-06
Classification: G02B

Abstract:
1. A whole group focusing structure comprising: a lens track cylinder, a first lens group, a second lens group and a drive motor, the first lens group and the second lens group being arranged sequentially from the object side; wherein at least hollow two guiding tracks are formed in an periphery of the lens track cylinder, a transition section formed in each of the hollow guiding tracks, and the transition sections being symmetrically arranged in an axial direction of the lens tracking cylinder, and a slant parallel section is formed at the end of each of the two guiding tracks and arranged in an axial direction of the lens track cylinder; the first lens group is provided with predetermined lenses and guiding member, and the guiding member is confined in one of the guiding tracks in the periphery of the lens track cylinder; the second lens group is provided with predetermined lenses and guiding member and is positioned correspondingly to the first lens group, the guiding member is confined in another one of the guiding tracks in the periphery of the lens track cylinder; and the drive motor serves to move the lens track cylinder.