Optical path device for generating a plurality of focal depths

Abstract

The present invention discloses an optical path device for generating a plurality of focal depths. The device comprises a beam split mechanism for receiving incident beam and dividing the incident beam into a first sub light beam and a second sub light beam; a focusing mechanism arranged at the light emergence side of the beam split mechanism and configured to focus the first sub light beam ejected by the beam split mechanism; and a first reflector comprising a reflection hook face for reflecting light beam, wherein the reflection hook face is arranged at the other light emergence side of the beam split mechanism, the second sub light beam ejected from the beam split mechanism passes through the reflection hook face to change an angle of incidence and is reflected to the focusing mechanism to be focused through the focusing mechanism. Through adoption of the mode of multiple focusing points, the optical path device for generating a plurality of focal depths can effectively realize large-depth-of-field or large-depth-of-focus processing, simplify the optical device structure and reduce the realization difficulty of the optical device.

Description

technical field [0001] The invention relates to optical transmission and focusing equipment, in particular to an optical path device for generating multiple focal depths. Background technique [0002] In the existing field of imaging or laser processing, there is a problem of depth of field or depth of field in optical equipment such as lenses, and imaging outside the range of depth of field or depth of field is not clear. In laser processing equipment, the depth of cut has a great relationship with the depth of focus. The depth of focus is an important data of the cutting thickness. Multiple focal points can be generated by using beams with multiple emission angles. Since the focal depth of each focus is a certain Data, so multiple focal points are equivalent to increasing the depth of focus, and the cutting thickness will also become larger. If fine laser processing is used, the processing spot needs to be small. The smaller the spot, the easier and finer the processing, ...

AI Technical Summary

Problems solved by technology

Please refer to figure 2 , the traditional method is to change the lens surface 102 of the focusing device 100. Different lens surfaces 102 will produce different focusing effects, such as lenses with a large depth of field and a large depth of focus. In order to achieve this purpose, the lens surface is made very complicated. , which greatly increases the difficulty of processing. This kind of lens is usually called aspherical lens. Mirror surface processing is a very fine processing technology. It is usually completed by combining multiple sets of spherical surfaces. Surfaces exceeding spherical surfaces will be difficult to manufacture. It is completed by using the natural characteristics of processing. A certain characteristic can only complete a characteristic reflective surface, such as processing a spherical mirror surface or a parabolic lens. If it exceeds these characteristic surfaces, it will be very difficult to process, or it is difficult to complete the processing accuracy requirements.

Images