High-precision automatic focusing device

Abstract

The invention discloses a high-precision automatic focusing device, mainly solving the problems of high precision requirement, high processing difficulty, loud noise, poor short focus imaging quality and long focus imaging quality, and inconvenient assembly in traditional automatic zooming device. The high precision automatic focusing device is characterized in that a lens cone (7) is internally provided with two guide bars (10); a zooming assembly (3) and a compensating assembly (4) are arranged inside the lens cone (7), can slide up and down along the guide bars (10), and are respectively connected with a zooming driving assembly (5) and a compensating driving assembly (6) which are arranged outside the lens cone (7) and are driven by a screw rod; a displacement sensor (11) which is connected with the zooming assembly (3) is arranged outside the lens cone (7); and an automatic iris is arranged between the compensating assembly (4) and a post-fixed lens assembly (2). The high-precision automatic focusing device improves imaging quality and focusing precision, guarantees stable image quality, is easy to assembly and convenient for lens cleaning and lens replacing.

Description

Technical field: [0001] The invention relates to an automatic focusing device, in particular to a high-precision automatic focusing device for low vision electronic vision aid devices. Background technique: [0002] At present, vision aids are mainly divided into two categories, namely optical vision aids and electronic vision aids. Optical vision aid is a device that uses optical properties to improve the visual activity level of low-vision patients. Electronic vision aids, also known as closed-circuit television vision aids, were first applied to low-vision patients by Potts et al. in 1959. At that time, they did not attract the attention of low-vision experts in various countries. , Only then has electronic vision aids been gradually promoted. The basic structure of the electronic vision aid includes a zoom lens, a CCD, a display, and a two-dimensional moving file table. Most of the electronic vision aids are desktop, a few are portable or hand-held, and the latest typ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the existing automatic zoom devices, such as high precision requirements, high processing difficulty, high noise, poor short-focus and long-focus imaging quality, and inconvenient assembly, the present invention provides a high-precision auto-focus device, the high-precision auto-focus The device improves the imaging quality and focus accuracy, ensures stable image quality, is easy to assemble, and is convenient for lens cleaning or replacement

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