Lens unit

Abstract

Disclosed is a lens unit which comprises: first and second lens groups, each of which comprises at least one lens, and which have a focusing function by being arranged in series on the same optical axis; a first lens barrel (1) that holds the first lens group; a second lens barrel (2) that holds the second lens group and contains at least a part of the first lens barrel; and an adjustment mechanism for adjusting the first lens barrel and the second lens barrel with respect to the relative positions of the optical axis directions, the relative inclinations of the optical axes, and the relative eccentricities.

Description

technical field [0001] The present invention relates to a lens unit including a plurality of optical lenses, and particularly relates to a lens unit excellent in assemblability for use in imaging devices and the like. Background technique [0002] With the advancement of technology, digital still cameras (also referred to as digital cameras) are rapidly spreading, and mobile phones with cameras are becoming common. Therefore, there is an increasing demand for technology to realize a compact imaging device. In addition, in the photographing device, it is also required to achieve high image quality in captured images. [0003] In general, an imaging device includes a lens unit composed of a plurality of lenses in order to form an image on an imaging surface of an imaging element. The performance such as the resolution of the imaging device is largely determined by the design of the lens barrel of the lens unit, the accuracy of parts, the assembly accuracy when inserting the ...

AI Technical Summary

Problems solved by technology

[0013] However, according to the method disclosed in Patent Document 1 and the methods disclosed in Patent Documents 2 and 3, the operability of adjusting the eccentricity of each lens is poor, and it is difficult to adjust the eccentricity of each lens with high precision.

There is a limit to reducing the decentering of each lens so that no adjustment is required

[0014] In addition, in recent years, more and more high-precision optical systems are required. If not only the eccentricity of the lenses, but also the distance and inclination between the lenses cannot be adjusted, it will be difficult to meet the performance requirements.

Images