CN207824206U - A kind of laser mark printing device based on frequency sweep OCT - Google Patents

Abstract

The utility model discloses a laser marking device based on frequency-sweeping OCT, comprising: a marking laser head, a lifting mechanism, and a marking workbench, the lifting mechanism is connected with the marking laser head, and the marking laser The head is equipped with: a marking laser system, the marking workbench is located under the marking laser head, and the marking laser head is also equipped with: a frequency-sweeping OCT system, the sample arm of the frequency-sweeping OCT system It has a coincident optical path with the marking laser system. This device uses a frequency-sweeping OCT system installed in the marking laser head, and the sample arm of the frequency-sweeping OCT system and the marking laser system have a coincident optical path, without adding additional optical path space, and the characteristics of the frequency-sweeping OCT system reduce The device is simple and reliable, and can be widely used in laser marking operations.

Description

A laser marking device based on frequency-sweeping OCT

technical field

The invention relates to the technical field of laser marking machines, in particular to a laser marking device based on frequency-sweeping OCT.

Background technique

Laser marking is to use the high energy of the laser to act on the surface of the workpiece, so that the surface of the workpiece can be vaporized instantly, and the characters and patterns with a certain depth can be written according to the predetermined trajectory. Existing laser marking machines generally use infrared reflection distance measurement to determine the focal point. An additional infrared emitter and infrared receiver are installed on the laser marking head. The infrared light emitted by the infrared emitter is reflected on the surface of the sample, and the infrared receiver The infrared light signal reflected back by the detector is combined with computer data processing to calculate the distance between the laser marking head and the sample. Then use the laser focus distance as a standard to judge whether the focus of the marking laser is on the surface of the sample; if the laser focus is not on the surface of the workpiece, use the lifting system to adjust the height of the laser marking head to focus.

However, this device requires the sample to have a good planar reflective surface in order to accurately control the focus of the system, otherwise the focus accuracy will be greatly reduced. Moreover, the device adds an optical path outside the laser marking head to add additional optical path space. If the workpiece blocks the infrared light, the focus cannot be achieved, and the limitation of the device is very large.

Utility model content

The technical problem solved by the utility model is: the existing laser marking machine has high requirements on the reflection ability of the workpiece plane and needs to add additional optical path space.

The solution of the utility model to solve the technical problem is: a laser marking device based on frequency-sweeping OCT, including: a marking laser head, a lifting mechanism, a marking workbench, the lifting mechanism and the marking laser head connection, the marking laser head is equipped with: a marking laser system, the marking workbench is located under the marking laser head, and the marking laser head is also equipped with: a frequency-sweeping OCT system, the The sample arm of the frequency-swept OCT system has a coincident optical path with the marking laser system.

Further, the marking laser system includes: a marking laser, a one-way lens, a two-dimensional scanning galvanometer system, and a flat-field lens. The marking laser is used to emit marking laser, and the marking laser passes through the one-way lens, a two-dimensional scanning galvanometer system, and a flat-field lens. The frequency-sweeping OCT system includes: a computer, a point detector, a frequency-sweeping laser, and a beam splitter. The computer is electrically connected to the lifting mechanism and the point detector respectively. In addition, the frequency-sweeping laser is used to emit frequency-sweeping laser, and the frequency-sweeping laser is divided into two laser beams through the beam splitter. The beam splitter is reflected into the point detector, and the second laser beam passes through the one-way lens, the two-dimensional scanning galvanometer system, and the flat-field lens in sequence.

Further, the lifting mechanism includes: a ball screw, a stepping motor, and a lifting arm, the driving end of the stepping motor is connected to the ball screw, the ball screw is connected to the lifting arm, and the lifting arm The arm is connected with the marking laser head.

The beneficial effects of the utility model are: the device utilizes the frequency-sweeping OCT system set in the marking laser head, and the sample arm of the frequency-sweeping OCT system and the marking laser system have overlapping optical paths, and no additional optical path space needs to be added. The characteristics of the frequency-sweeping OCT system reduce the requirement for the reflection ability of the workpiece plane. The device is simple and reliable, and can be widely used in laser marking operations. The focus of the marking laser is tracked by the frequency-sweeping OCT system, computer, and lifting mechanism. The combination of the computer and the lifting mechanism makes the focus of the marking laser always fall on the workpiece plane, ensuring that the marking laser will not out of focus.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following will briefly describe the accompanying drawings that are used in the description of the embodiments. Apparently, the drawings described are only some embodiments of the utility model, not all embodiments, and those skilled in the art can also obtain other designs and drawings according to these drawings without creative work.

Fig. 1 is a structural schematic diagram of the inventive device.

Detailed ways

The idea, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model. Apparently, the described embodiments are only some of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without paying creative efforts, All belong to the protection scope of the utility model. In addition, all the connection/connection relationships mentioned in this article do not refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions. The various technical features in the invention can be combined interactively on the premise of not conflicting with each other.

Embodiment 1, referring to FIG. 1, a laser marking device based on frequency-sweeping OCT, including: a marking laser head 14, a lifting mechanism, and a marking workbench 7, and the lifting mechanism is connected to the marking laser head 14 , the marking laser head 14 is equipped with: a marking laser system and a frequency-sweeping OCT system, and the marking workbench 7 is located below the marking laser head 14 . The marking laser system includes: a marking laser 2 , a one-way lens 4 , a two-dimensional scanning galvanometer system 5 , and a flat-field lens 6 . The frequency-sweeping OCT system includes: a computer 11, a point detector 10, a frequency-sweeping laser 1, and a beam splitter 9. The computer 11 is electrically connected to the lifting mechanism and the point detector 10, respectively.

When the device works, the workpiece is placed on the marking table 7, the marking laser 2 emits a marking laser, and the marking laser passes through the one-way lens 4, the two-dimensional scanning galvanometer system 5, the flat The field lens 6 illuminates the workpiece. The frequency-sweeping laser 1 emits a frequency-sweeping laser, and the frequency-sweeping laser is divided into two beams of light on the beam splitter 9, the first beam of light passes through the beam splitter 9 and reaches the reference mirror 8, and the reference mirror 8 divides the beam of light It is reflected back to the beam splitter 9 and through said beam splitter 9 again into the point detector 10 . It can be seen that the optical path between the beam splitter 9 and the reference mirror 8 forms the reference arm of the frequency-swept OCT system. In order to meet the optical distance requirements, an optical path module (not shown) can be provided between the beam splitter 9 and the reference mirror 8 out). The second beam of light is reflected on the surface of the beam splitter 9, and enters the two-dimensional scanning vibrating mirror system 5 through the reflection of the one-way mirror 4, and then enters the flat-field lens 6 and the marking workbench 7, and the light on the marking workbench 7 The surface of the workpiece is reflected, and the reflected light returns to the beam splitter 9 through the original path, and enters the point detector 10 through the beam splitter 9 . It can be seen that the optical path between the one-way mirror 4, the two-dimensional scanning galvanometer system 5, the flat-field lens 6, and the marking table 7 forms the sample arm of the frequency-sweeping OCT system.

The two beams of light entering the point detector 10 form an interference signal. The computer 11 receives the interference signal from the point detector 10, and calculates the optical path difference between the reference arm and the sample arm. If there is an optical path difference, it means that the focus of the marking laser is not on the marking plane; If the distance difference is small, it means that the focus of the marking laser is on the marking plane. According to whether there is an optical path difference, the computer 11 controls the stepping motor 12 on the lifting mechanism to rotate, and then drives the ball screw 13 to rotate, so that the lifting arm 15 rises and falls, changes the height of the marking laser head 14, and finally adjusts the marking laser The distance between the head 14 and the workpiece on the marking table 7 is such that the optical paths of the reference arm and the sample arm are equal, so that the focus of the marking laser is located on the surface of the workpiece to ensure that it does not go out of focus.

In this device: the optical path between the one-way perspective mirror 4, the two-dimensional scanning galvanometer system 5, the flat-field lens 6, and the marking workbench 7 is the system optical path of the marking laser system and the frequency-sweeping OCT system. The sample arm, so the device does not need to add additional space for the optical path, and the structure is simple. At the same time, during the laser marking process, the frequency-sweeping OCT system and the computer 11 are in working condition, and the height of the marking laser head 14 is adjusted in real time to realize real-time tracking of the laser focus.

The preferred embodiments of the present utility model have been specifically described above, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent modifications without violating the spirit of the present utility model Or replacement, these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims (3)

1. A laser marking device based on frequency-sweeping OCT, comprising: a marking laser head, a lifting mechanism, and a marking workbench, the lifting mechanism is connected with the marking laser head, and the marking laser head is equipped with There is a marking laser system, the marking workbench is located under the marking laser head, and it is characterized in that the marking laser head is also equipped with: a frequency-sweeping OCT system, the sample of the frequency-sweeping OCT system The arm has a coincident optical path with the marking laser system. 2. A laser marking device based on frequency-sweeping OCT according to claim 1, wherein the marking laser system comprises: a marking laser, a one-way lens, a two-dimensional scanning galvanometer system, a flat field lens, the marking laser is used to emit marking laser, and the marking laser passes through a one-way lens, a two-dimensional scanning galvanometer system, and a flat-field lens in sequence. The frequency-sweeping OCT system includes: a computer, a point detector, A frequency-sweeping laser and a beam splitter, the computer is electrically connected to the lifting mechanism and the point detector respectively, the frequency-sweeping laser is used to emit a frequency-sweeping laser, and the frequency-sweeping laser is divided into two laser beams by a beam-splitting mirror , the first beam of laser light passes through the beam splitter to reach the reference mirror and is reflected, and then reflected by the beam splitter into the point detector, the second beam of laser light passes through the one-way lens, the two-dimensional scanning galvanometer system, Flat field lens. 3. A laser marking device based on frequency-sweeping OCT according to claim 1 or 2, wherein the lifting mechanism comprises: a ball screw, a stepping motor, and a lifting arm, and the stepping motor The driving end is connected with the ball screw, the ball screw is connected with the lifting arm, and the lifting arm is connected with the marking laser head.