JP-7854621-B2 - Laser processing head

Inventors

• 鈴木 優顕

Assignees

• パナソニックＩＰマネジメント株式会社

Dates

Publication Date

20260507

Application Date

20220124

Claims (6)

1. A laser processing head that emits laser light onto a workpiece, A transmission fiber for transmitting the aforementioned laser light, A focusing lens for focusing the laser light transmitted through the transmission fiber, A collimator lens positioned on the optical path of the laser light, on the transmission fiber side of the focus lens, An aspherical lens, which is positioned on the optical path of the laser light on the transmission fiber side of the focus lens and the collimator lens , and is configured separately from the focus lens and the collimator lens , A laser processing head comprising a moving mechanism that moves the aspherical lens and the collimator lens in the optical axis direction, respectively , to change the beam profile of the laser light emitted from the workpiece to a beam profile in which the outer circumference of the circular laser light is surrounded by the ring-shaped laser light.
2. A laser processing head that emits laser light onto a workpiece, A transmission fiber for transmitting the aforementioned laser light, A focusing lens for focusing the laser light transmitted through the transmission fiber, An aspherical lens, which is positioned on the optical path of the laser beam closer to the workpiece than the focusing lens and is configured separately from the focusing lens, The system includes a moving mechanism that moves the aspherical lens and the focusing lens in the direction of the optical axis, thereby changing the beam profile of the laser beam emitted towards the workpiece to a beam profile in which the outer circumference of the circular laser beam is surrounded by a ring-shaped portion of the laser beam. Laser processing head.
3. In the laser processing head according to claim 1 or 2, The aspherical lens positioned closest to the transmission fiber has a focal length f, f > | 200 | mm A laser processing head that meets the following conditions.
4. In any one of the laser processing heads according to claim 1 to 3, The aspherical lens is a laser processing head having negative power that diverges the laser light.
5. In the laser processing head according to claim 1, The moving mechanism includes a first moving mechanism for moving the aspherical lens in the optical axis direction and a second moving mechanism for moving the collimator lens in the optical axis direction. Laser processing head.
6. In the laser processing head of claim 2, The aforementioned moving mechanism includes a first moving mechanism for moving the aspherical lens in the optical axis direction and a third moving mechanism for moving the focusing lens in the optical axis direction. Laser processing head.

Description

This invention relates to a laser processing head. Patent Document 1 discloses a laser processing machine in which laser light emitted from a laser oscillator is transmitted to a coupler via a feeding fiber, and the laser light, whose beam profile has been modified by the coupler, is transmitted to a processing head via a process fiber. Patent No. 6764976 This is a schematic diagram showing the configuration of the laser processing apparatus according to this embodiment 1.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the first beam profile.This figure shows the first beam profile.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the second beam profile.This is a diagram showing the second beam profile.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the third beam profile.This is a diagram showing the third beam profile.This diagram compares the minimum spot diameter of aspherical lenses at different focal lengths.This is a schematic diagram showing the configuration of the laser processing apparatus according to this second embodiment.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the first beam profile.This figure shows the first beam profile.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the second beam profile.This is a diagram showing the second beam profile.This figure shows the positions of the aspherical lens, collimator lens, and focusing lens for obtaining the third beam profile.This is a diagram showing the third beam profile. The embodiments of the present invention will be described below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses. Embodiment 1 As shown in Figure 1, the laser processing apparatus 1 comprises a laser oscillator 10, a transmission fiber 15, a laser processing head 20, a first moving mechanism 31, a second moving mechanism 32, and a control unit 35. The laser oscillator 10 outputs laser light L. The laser light L output from the laser oscillator 10 is incident on the transmission fiber 15. The input end of the transmission fiber 15 is connected to the laser oscillator 10. The output end of the transmission fiber 15 is connected to the laser processing head 20. The transmission fiber 15 transmits the laser light L incident from the laser oscillator 10 toward the laser processing head 20. The laser processing head 20 emits the laser beam L transmitted through the transmission fiber 15 toward the outside. In the laser processing apparatus 1 shown in Figure 1, the laser beam L is emitted toward the workpiece W positioned at a predetermined location. The laser processing head 20 includes an aspherical lens 21, a collimator lens 22, a focusing lens 23, and protective glass 24. The aspherical lens 21, collimator lens 22, focusing lens 23, and protective glass 24 are arranged in the optical path of the laser beam L, starting from the upstream side in the direction of laser beam emission L. The aspherical lens 21 has negative power that diverges the laser beam L. Specifically, the aspherical lens 21 has a concave surface 21a. The aspherical lens 21 is positioned so that the concave surface 21a faces downstream in the direction of laser beam L emission. The aspherical lens 21 diverges the laser beam L emitted from the output end of the transmission fiber 15. Here, by positioning the aspherical lens 21 closer to the transmission fiber 15 than the focus lens 23, the diameter of the aspherical lens can be reduced and the overall length of the head can be shortened compared to when the aspherical lens 21 is positioned closer to the workpiece W. The collimator lens 22 parallelizes the laser beam L that was diverged by the aspherical lens 21. The focusing lens 23 concentrates the laser beam L, which has been parallelized by the collimator lens 22. The laser beam L, focused by the focusing lens 23, passes through the protective glass 24 and is emitted to the workpiece W. The protective glass 24 is placed between the workpiece W and the focus lens 23. The protective glass 24 protects the focus lens 23 from fumes and spatter generated during laser processing of the workpiece W, preventing them from adhering to the lens. The first moving mechanism 31 moves the aspherical lens 21 along the optical axis. The first moving mechanism 31 is composed of, for example, an actuator combining a motor and a cam. Note that the first moving mechanism 31 is not limited to this configuration, as long as it is capable of moving the aspherical lens 21 along the optical axis. The second movement mechanism 32 moves the collimator lens 22, which acts as an aspherical lens, along the optical ax