Fast focusing telescopic landscape lens

Abstract

The invention discloses a fast focusing telescopic landscape lens including an objective lens barrel, a guide pin, a straight trough barrel, a curved trough barrel, a focusing handwheel and a rear lens body. The straight trough barrel is connected with the rear lens body fixedly. An end of the objective lens barrel is arranged in the straight trough barrel in a penetrating manner. The curved trough barrel is arranged outside the straight trough barrel in a sleeving manner. The focusing handwheel is fixed at an end of the curved trough barrel. The objective lens barrel has a fixing hole. At least one straight trough is arranged in the outer wall of the straight trough barrel in the axial direction of the straight trough barrel. At least one curved trough is arranged in the outer wall of the curved trough barrel. One end of the guide pin is disposed in the fixing hole while the other end of the guide pin penetrates through the straight trough in the straight trough barrel and is disposed in the curved trough in the curved trough barrel. A plurality of scale lines are arranged in the outer side wall of the objective lens barrel. According to the invention, fast focusing can be performed by utilizing the scale lines. The integral appearance of the landscape lens is not affected. Besides, when the fast focusing telescopic landscape lens is not in use, the objective lens barrel can be retracted, so that the size of the fast focusing telescopic landscape lens can be reduced and convenience is made for carrying.

Description

technical field [0001] The invention relates to a focusing mechanism of a viewfinder, in particular to a fast focusing telescopic viewfinder. Background technique [0002] The retractable objective lens barrel sight glass in the prior art has the structure that the longitudinal guide groove of the lens body guide barrel is arranged on the outer circular surface, and the convex pin steel ball in the objective lens barrel is matched with the longitudinal reciprocating movement in the groove. The disadvantage is that when the objective lens barrel is unfolded Finally, the outer longitudinal groove of the mirror body guide cylinder is exposed to the outside, especially after the radial convex pin steel ball slides along the groove, the sliding marks left seriously affect the appearance of the cylinder body. In other existing improvement techniques, there is no better solution to this problem. [0003] In addition, when using the current viewfinder, according to the different vi...

AI Technical Summary

Problems solved by technology

[0002] The retractable objective lens barrel sight glass in the prior art has the structure that the longitudinal guide groove of the lens body guide barrel is arranged on the outer circular surface, and the convex pin steel ball in the objective lens barrel is matched with the longitudinal reciprocating movement in the groove. The disadvantage is that when the objective lens barrel is unfolded Afterwards, the outer longitudinal groove of the lens body guide cylinder is exposed to the outside, especially after the radial convex pin steel ball slides along the groove, the left slip marks seriously affect the appearance of the cylinder body

In other existing improvement techniques, there is no better solution to this problem

[0003] In addition, when using the current viewfinder, according to the different viewing distances, the focus needs to be adjusted first. This focusing process is relatively slow, and it is difficult for the user to quickly find the appropriate focal length, so the best opportunity for viewing is often missed.

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