A transmission nut with high transmission precision

Abstract

The invention discloses a transmission nut high in transmission accuracy. A U-shaped opening which can connect the transmission nut with a transmission bolt in a matching mode easily is arranged on a nut body, a main thread which is matched with a thread of the transmission bolt is arranged on one side inside the U-shaped opening, an elastic pressing block is arranged on the other side of the U-shaped opening, and a spring thread which is matched with the thread of the transmission bolt is arranged on the elastic pressing block. According to the transmission nut, the size is small, so that the requirements of the structural design of an optical zoom lens can be met easily, and the space for the structural design of the lens can be saved; and simultaneously, the U-shaped opening structure is used, so that the small thread pitch size and the small thread form can be machined conveniently. The transmission nut in the structure has the advantages that the transmission accuracy is high, the nut can be installed and connected with the transmission bolt easily and the size is small, and the matching precision of the transmission nut and the transmission bolt is improved, so that the position shifting of the optical zoom lens is small and accurate, and the optical performance of the whole optical zoom lens is improved.

Description

【Technical field】 [0001] The invention relates to a drive nut, in particular to a drive nut applied to an optical zoom lens. 【Background technique】 [0002] At present, optical zoom and auto-focus lenses need to drive the lens assembly through the cooperation of the drive screw and the drive nut to achieve the change in optical performance. Usually, the drive device is used to drive the drive screw to rotate, so that the drive nut on the drive screw and The lens assembly generates displacement, and through the transmission nut, the rotational motion of the transmission screw is converted into the linear motion required by the lens assembly. [0003] However, the transmission nut used in the existing lens assembly on the market is made of plastic and adopts a full-circle thread design. The transmission nut of this structure: first of all, it is inconvenient to assemble, and the transmission nut must be rotated continuously to connect with the lens assembly. Mates connect tog...

AI Technical Summary

Problems solved by technology

[0003] However, the transmission nut used in the existing lens assembly on the market is made of plastic and designed with a full circle of threads. The transmission nut of this structure: first of all, it is inconvenient to assemble, and the transmission nut must be rotated continuously to connect with the lens assembly. fit together

The production of transmission nuts is mainly through mold molding. The threads of this production method are prone to small burrs, which are difficult to eradicate, and seriously affect the transmission accuracy and optical performance of the lens optics during use; moreover, when the transmission nut and the metal transmission screw interact During the operation, the drive nut is easily damaged, which makes the lens unusable and needs to be replaced frequently; moreover, the plastic drive nut with a full circle of thread cannot be molded when the pitch size and thread size are miniaturized, and cannot adapt Lens Miniaturization Requirements

In addition, if the drive nut with a full circle of threads is made by metal processing, the cost will increase, and at the same time, small metal burrs will appear on the thread position, which will affect the transmission accuracy of the lens assembly.

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