Abstract: Disclosed herein is an improved zoom lens fixing mechanism comprising a fixing sleeve, a cam sleeve, a front lens holder, a rear lens holder, a back cover, and four rollers, in which the fixing sleeve has a cam slot and three long slots and the cam sleeve has a long slot and three cam slots. The front lens holder has three screw holes and the rear lens holder has one screw hole. During the assembling, or fixing, of the improved zoom lens of the present invention, the rollers are first affixed into respective screw holes. The rollers affixed to the front lens holder are placed into the long slots on the fixing sleeve and the cam slots on the cam sleeve, which also sleeves around the fixing sleeve. Whereas, the roller affixed to the rear lens holder is placed into the cam slot on the fixing sleeve and the long slot on the cam sleeve.

Abstract: An improved mechanism for cameras includes a solenoid which drives a cam ring to rotate to a control position for focusing or exposing; a motor drives a planetary gear set which includes a swing arm with a pinion fixed thereon. When the cam ring is in the control position for focusing, the pinion transmits the power generated by the motor to the teeth of the focusing ring to cause the focusing ring to rotate and focus. When the cam ring is in the control position of exposing, the pinion disengages from the teeth of the focusing ring to engage with the internal gear of the planetary gear set to cause the swing arm to oscillate and thereby actuate the shutter mechanism. At this time, the cam ring also initiates the movement of a ratchet set so that the focusing ring cannot move freely during the exposure process.