Lens barrel extending and retracting mechanisms

Abstract

The present invention provided a lens barrel which can be made thin while maintaining optical performance. A photographing optical axis (J1) and the central axis (J2) of the lens barrel are positioned away from their centers. A first lens group (31) and a second lens group (32) are retracted in the direction of a CCD (35) away from the J1. Thus, the lens barrel is brought into the state of being stored. The lens barrel 2 is extended by being rotated around the J2, and the optical axis J3 of the second lens group (32) and the first lens group (31) are made to coincide with the J1. Thus, the lens barrel is brought into the state of being photographed. The lens barrel extending and retracting mechanism makes it possible to store the lens barrel in a thin form while maintaining the optical performance by preventing displacement of the optical axes of the first lens group (31) and the second lens group (32) or their mutual inclination.

Description

technical field [0001] The invention relates to a sunken lens barrel with a storage position and a shooting position. Background technique [0002] Recently, the demand for miniaturization of digital cameras has not stagnated. In particular, for the purpose of improving portability, more attention has been paid to the thinning of cameras. Therefore, thinning of the lens barrel unit is required to limit the thinning of cameras. It is known that as a method of reducing the thickness of the lens barrel unit, when not in use, the distance between the lens group and the imaging element is reduced, and the lens barrel is lowered to store it. [0003] In addition, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2003-315861), in the stored state, a part of the photographic lens group is shifted from the photographic optical axis and pulled in to sink, so as to achieve the lens mirror in the stored state. Thinning of the barrel. In addition, in Patent Document 2 (J...

AI Technical Summary

Problems solved by technology

In this case, the photographic optical axis of the lens group is shifted, especially the optical axis shift of the first lens group and the second lens group from the subject side, or the first lens group and the second lens group The inclination of the relative optical axis between them has a great influence on the optical performance. In the embodiment of patent document 1 or 2, only the method of retracting and storing the second group of lens groups with an individual retracting device is easy to produce inclination or parallelism of the lens groups. Off-center, it is difficult to maintain its optical performance

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