Optical device

摘要

In an optical device, a first spring connects a first lens frame and a second lens frame for exerting a spring force thereon so that first pins of the first lens frame and second pins of the second lens frame abut a first cam groove and a second cam groove of a cam barrel respectively. A second spring connects the second lens frame and a third lens frame for exerting a spring force thereon so that the second pins of the second lens frame and third pins of the third lens frame abut the second cam groove and a third cam groove of the cam barrel respectively. The first spring may be a compression spring, and the second spring may be an extension spring.

主权项

1. An optical device, comprising:
a straight advance barrel having an axis and a plurality of guiding grooves parallel to the axis; a cam barrel rotatably disposed around the straight advance barrel and having a first cam groove and a second cam groove; a first lens frame bearing a first lens group and having a plurality of first pins which extend through the guiding grooves and movably engage the first cam groove, wherein when the cam barrel rotates, the first cam groove moves the first pins along the guiding grooves so as to move the first lens frame along the axis; a second lens frame bearing a second lens group and having a plurality of second pins which extend through the guiding grooves and movably engage the second cam groove, wherein when the cam barrel rotates, the second cam groove moves the second pins along the guiding grooves so as to move the second lens frame along the axis; and a first spring connecting the first lens frame and the second lens frame and exerting a first spring force on the first lens frame and the second lens frame so that the first pins and the second pins abut the first cam groove and the second cam groove respectively.