Patent Publication Number: US-2022212283-A1

Title: Adjustment method of laser light path and adjustment device of laser light path

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefits of Taiwan application Serial No. 110100014, filed on Jan. 4, 2021, the disclosures of which are incorporated by references herein in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates in general to an adjustment method of laser light path and adjustment device of laser light path. 
     BACKGROUND 
     While in applying laser cutting to process a glass substrate, a direction of the laser is usually adjusted to be coaxial with a normal direction of the glass substrate, such that a better cutting quality can be presented. However, as the application range of the laser cutting becomes more and more extensive, a glass substrate with an uneven surface may be met. Obviously, a curve surface of the glass substrate will not provide a unique normal direction, and thus performance of laser cutting upon a curve surface of the glass substrate on a traditional cutting platform by a traditional processing head would be unpredictable. To resolve this concern, an AC-axis processing head is introduced, and thus an expansive and complicated five-axis swing platform can be avoided. 
     Nevertheless, the AC-axis processing head can only overcome some problems in cutting a curve surface of the glass substrate. Generally speaking, as shown in  FIG. 1A  and  FIG. 1B , a laser light path in an optical axis L 11  passing a focusing lens  10  is schematically presented. In a normal situation, the optical axis L 11  of the laser light path is coincided with an optical axis AX of the focusing lens  10 . Thus, while the AC shaft is rotated, a laser focus P 1  would be kept the same on a processing plane W. However, as shown in  FIG. 2A  and  FIG. 2B , the optical axis L 12  of the laser light path forms an angle AG to the optical axis AX of the focusing lens  10  (i.e., the laser light path is oblique). In this case, as the AC axis rotates, the laser light path passing the focusing lens  10  would form a laser focus P 2  on the processing plane W, which is deviated from a preset focal position PZ. Further, while the processing head rotates about a C or A axis, different angles would be formed between the oblique laser light and the focusing lens, thereupon the oblique laser would generate different focal points on the processing plane W, and all of these focal points (P 2  for example) would be deviated from the preset focal position PZ. In particular, as the processing head rotates 360° about the C or A axis, then the laser focus P 2  corresponding the oblique laser light path along the optical axis L 12  would form a circular trajectory on the processing plane W. 
     Apparently, a light-adjusting mechanism or method shall be introduced to substantially keep a fixed focal point on the processing plane while the laser processing head is rotated with the rotating shaft during a laser processing. In the art, a test specimen is firstly fixed to the processing plane, and several adjustment trials would be applied to the rotating shaft according to observations upon trajectories of the laser light path till satisfied trajectories of the focal points on the processing plane is achieved. Empirically, these trials would be cumbersome, and provide less information to determine whether or not the instant optical axis is inclined. Thus, an issue to provide an adjustment method of laser light path and an adjustment device of laser light path to resolve the aforesaid problems is definitely urgent to the skill in the art. 
     SUMMARY 
     An object of the present disclosure is to provide an adjustment method of laser light path and an adjustment device of laser light path, that a target laser focal position can be obtained without a need of the traditional trial process to observe trajectories of focal points through a simulation process. 
     In one aspect of this disclosure, an adjustment method of laser light path includes: a step of having a laser light path to penetrate through a measuring device to obtain at least two laser focal positions of the laser light path, the at least two laser focal positions forming an arc path; a step of applying a focal position-calculating device to calculate coordinate values of the at least two laser focal positions; a step of based on the arc path and the coordinate values of the at least two laser focal positions, applying the focal position-calculating device to calculate a target laser focal position; and, a step of based on the target laser focal position, applying a light modulator to adjust each of the at least two laser focal positions to the target laser focal position. 
     In another embodiment of this disclosure, an adjustment method of laser light path includes: a step of having a laser light path to penetrate through a 2D measuring device to obtain a first laser focal position in a first direction and a first coordinate value in a second direction; a step of rotating the laser light path by an angle on the 2D measuring device from the first laser focal position to obtain a second laser focal position of the laser light path; a step of applying the 2D measuring device to obtain a second coordinate value of the second laser focal position in the first direction and the second direction; a step of, based on the first coordinate value and the second coordinate value, applying a focal position-calculating device to calculate a target laser focal position; and, a step of, based on the target laser focal position, applying a light modulator to adjust each of the first laser focal position and the second laser focal position to the target laser focal position. 
     In a further embodiment of this disclosure, an adjustment method of laser light path includes: a step of having a laser light path to penetrate through a 1D physical characteristics element in a 1D measuring device to obtain a first laser focal position corresponding to the laser light path, the 1D physical characteristics element having a given characteristics information; a step of applying an energy measuring element in the 1D measuring device to measure a first energy of the laser light path; a step of, based on the given characteristics information and the first energy of the laser light path, applying a focal position-calculating device to calculate a first coordinate value of a first laser focal position; a step of having the first coordinate value as a starting point to rotate the laser light path by an angle to provide a second laser focal position and correspondingly a second energy on the 1D physical characteristics element; a step of, based on the given characteristics information and the second energy of the laser light path, applying the focal position-calculating device to calculate a second coordinate value of a second laser focal position; a step of, based on the first coordinate value and the second coordinate value, applying a focal position-calculating device to calculate a target laser focal position; and, a step of, based on the target laser focal position, applying a light modulator to adjust the first laser focal position and the second laser focal position to the target laser focal position. 
     In another aspect of this disclosure, an adjustment device of laser light path includes a laser processing device, a measuring device, a focal position-calculating device and a light modulator. The laser processing device is configured for receiving a laser light path. The measuring device is connected with the laser processing device. The laser light path penetrates through the measuring device to form at least two laser focal positions, and the at least two laser focal positions form an arc path. The focal position-calculating device, connected with the measuring device, is to calculate coordinate values of the at least two laser focal positions and further a target laser focal position. The light modulator is connected with the laser processing device and the focal position-calculating device. Based on the target laser focal positions, the light modulator adjusts each of the at least two laser focal positions to the target laser focal position. 
     In another embodiment of this disclosure, an adjustment device of laser light path includes a laser processing device, a measuring device, a focal position-calculating device and a light modulator. The laser processing device is configured for receiving a laser light path. The 2D measuring device is connected with the laser processing device, the laser light path penetrates through the 2D measuring device to form at least two laser focal positions at a coordinate value in a first direction and a second direction, and the at least two laser focal positions form an arc path. The focal position-calculating calculating device, connected with the 2D measuring device, is to evaluate the coordinate value of the at least two laser focal positions in the first direction and to adjust each of the at least two laser focal positions to the target laser focal position. 
     In a further embodiment of this disclosure, an adjustment device of laser light path includes a laser processing device, a 1D measuring device, a focal position-calculating device and a light modulator. The laser processing device is configured for receiving a laser light path. The 1D measuring device, connected with the laser processing device, provides a given characteristics information, and obtains first energy of at least two laser focal positions formed by the laser light path to penetrate through the 1D measuring device. The focal position-calculating device, connected with the 1D measuring device, is to evaluates the given characteristics information and the first energy of the at least two laser focal positions of the laser light path to calculate coordinate values of the at least two laser focal positions and to further calculate a target laser focal position according to the coordinate values of the at least two laser focal positions. The light modulator, connected with the laser processing device and the focal position-calculating device, is to adjust each of the at least two laser focal positions to the target laser focal position. 
     As stated, through the steps for providing at least two laser focal positions of the laser light path and the resulted arc path formed by the at least two laser focal positions in accordance with this disclosure, it can be determined whether or not the optical axis of the laser light path is oblique. Thus, real processing is not necessary to observe the focal position. In addition, based on the arc path and the coordinate values of the corresponding laser focal positions, the target laser focal position to satisfy the demand in light adjustment can be obtained. 
     Further scope of applicability of the present application will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the disclosure, are given by way of illustration only, since various changes and modifications within the spirit and scope of the disclosure will become apparent to those skilled in the art from this detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present disclosure and wherein: 
         FIG. 1A  demonstrates schematically an embodiment of a laser light path in the art; 
         FIG. 1B  is a schematic view of a focal point on a processing plane for  FIG. 1A ; 
         FIG. 2A  demonstrates schematically another embodiment of a laser light path in the art; 
         FIG. 2B  is a schematic view of a focal point on a processing plane for  FIG. 2A ; 
         FIG. 3  is a schematic block view of an embodiment of the adjustment device of laser light path in accordance with this disclosure; 
         FIG. 4  shows schematically a flowchart of an embodiment of the adjustment method of laser light path in accordance with this disclosure; 
         FIG. 5A  illustrates schematically a step of  FIG. 4 ; 
         FIG. 5B  illustrates schematically another step of  FIG. 4 ; 
         FIG. 6A  is a schematic view of an embodiment of the laser processing device in accordance with this disclosure; 
         FIG. 6B  is a schematic view of another embodiment of the laser processing device in accordance with this disclosure; 
         FIG. 7  is a schematic block view of another embodiment of the adjustment device of laser light path in accordance with this disclosure; 
         FIG. 8  shows schematically a flowchart of another embodiment of the adjustment method of laser light path in accordance with this disclosure; 
         FIG. 9A  illustrates schematically a step of  FIG. 8 ; 
         FIG. 9B  illustrates schematically another step of  FIG. 8 ; 
         FIG. 9C  illustrates schematically a further step of  FIG. 8 ; 
         FIG. 10  is a schematic block view of a further embodiment of the adjustment device of laser light path in accordance with this disclosure; 
         FIG. 11  shows schematically a flowchart of a further embodiment of the adjustment method of laser light path in accordance with this disclosure; 
         FIG. 12  is a schematic view of an embodiment of the 1D physical characteristics element of  FIG. 10 ; 
         FIG. 13A  demonstrates schematically a first laser focal position in the first direction of  FIG. 11 ; 
         FIG. 13B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the first direction of FIG. 11 , specifically at the first penetration rate; 
         FIG. 13C  illustrates the first laser focal position with respect to the first length in the first direction of  FIG. 13B ; 
         FIG. 14A  illustrates schematically that the first laser focal position is rotated to the second laser focal position of  FIG. 11 ; 
         FIG. 14B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the first direction of FIG. 11 , specifically at the second penetration rate; 
         FIG. 14C  illustrates the first laser focal position with respect to the second length in the first direction of  FIG. 14B ; 
         FIG. 15A  illustrates schematically an embodiment of calculating the target laser focal position in the first direction of  FIG. 11 ; 
         FIG. 15B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the first direction of FIG. 11 , specifically at the third length; 
         FIG. 15C  illustrates schematically an embodiment of adjusting the laser focal position to the calculated target laser focal position in the first direction of  FIG. 11 ; 
         FIG. 16A  demonstrates schematically a first laser focal position in the second first direction of  FIG. 11 ; 
         FIG. 16B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the second direction of FIG. 11 , specifically at the second penetration rate; 
         FIG. 16C  illustrates schematically the second laser focal position with respect to the second length in the second direction of  FIG. 16B ; 
         FIG. 17A  illustrates schematically the second laser focal position in the second direction of  FIG. 11 ; 
         FIG. 17B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the second direction of FIG. 11 , specifically at another second penetration rate; 
         FIG. 17C  illustrates schematically the second laser focal position with respect to the second length in the second direction of  FIG. 17B ; 
         FIG. 18A  illustrates schematically an embodiment of calculating the target laser focal position in the second direction of  FIG. 11 ; 
         FIG. 18B  shows schematically an example of the physical characteristics curve changing information for different lengths of the 1D physical characteristics element with respect to the corresponding penetration rates in the second direction of FIG. 11 , specifically at the third length; and 
         FIG. 18C  illustrates schematically an embodiment of adjusting the laser focal position to the calculated target laser focal position in the second direction of  FIG. 11 . 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing. 
       FIG. 3  is a schematic block view of an embodiment of the adjustment device of laser light path in accordance with this disclosure. As shown, the adjustment device of laser light path  100  includes a laser source  110 , a laser processing device  120 , a measuring device  130 , a focal position-calculating device  140  and a light modulator  150 . In this embodiment, the measuring device  130 , the focal position-calculating device  140  or the light modulator  150  are not limited any specific type. The laser processing device  120  includes at least a focusing lens and a rotating shaft. The laser source  110  is used for generating a laser light path GL for the laser processing device  120 . The laser processing device  120  can be embodied as a single-axis pendulum as shown in  FIG. 6A  or a multi-axis pendulum as shown in  FIG. 6B . 
     In this embodiment, the measuring device  130 , connected with the laser processing device  130 , is used for measuring the laser focal position of the laser light path GL. The focal position-calculating device  140 , connected with the measuring device  130 , is used for calculating coordinate values of the laser focal position. The light modulator  150 , connected with the laser processing device  120  and the focal position-calculating device  140 , is used for adjusting the laser focal position to a target laser focal position so as to obtain a preferable light-focusing quality. 
       FIG. 4  shows schematically a flowchart of an embodiment of the adjustment method of laser light path in accordance with this disclosure,  FIG. 5A  illustrates schematically a step of  FIG. 4 , and  FIG. 5B  illustrates schematically another step of 
       FIG. 4 . Referring to  FIG. 4  and  FIG. 3 , in this embodiment, the adjustment method of laser light path S 100  includes Step S 110  to Step S 140  as follows. Firstly, the laser source  110  is applied to construct a laser light path GL to the laser processing device  120 . Then, Step S 110  is performed to have the laser light path GL to penetrate through the measuring device  130 , so that at least two focal positions of the laser light path can be obtained to form an arc path. 
     In detail, by having  FIG. 5A  as an example and also referring to  FIG. 1 , after the laser light path GL to the laser processing device  120  is generated by the laser source  110 , then the measuring device  130  is applied to obtain a first laser focal position P 3  of the laser light path GL. Then, a rotating shaft is rotated to change the focal position of the laser light path GL. Then, the measuring device  130  is also used to obtain a second laser focal position P 4  of the after the rotation. With the first laser focal position P 3  and the second laser focal position P 4 , an arc path LD 1  can be formed. 
     In one embodiment of this disclosure, the step of rotating the rotating shaft includes a following step of having the measuring device  130  to determine whether or not an optical axis of a focusing lens is coincided with the first laser focal position. If positive, then a light-adjusting step is not necessary. Otherwise, perform a step of having the first laser focal position P 3  as a starting point to rotate about the optical axis of the focusing lens, so that the second laser focal position P 4  can be obtained. It shall be explained that, if the rotation angle is 180°, an arc path LD 1  can be obtained. 
     In one embodiment, the foregoing step can be executed by a single-axis pendulum mechanism or a multi-axis pendulum mechanism. Referring to  FIG. 6A , a schematic view of an embodiment of the laser processing device in accordance with this disclosure is shown. In this embodiment, the laser processing device  60  is embodied as a single-axis pendulum mechanism to include a laser connector  61 , a first part  62 , a rotation portion  63 , a second part  64  and a laser processing head  65 , in which the first part  62  and the second part  64  are united to form a housing for accommodating the rotation portion  63 . 
     The optical lens  621  is disposed in the first part  62 , the focusing lens  641  is disposed in the second part  64 , and the rotation portion  63  is located between the optical lens  621  and the focusing lens  641 . Upon such an arrangement, the laser light transmitted from the laser connector  61  can pass through the optical lens  621 , such that the laser light can be projected onto the focusing lens  641  and then leave the single-axis pendulum mechanism via the laser processing head  65 . While the aforesaid laser light is reflected to the focusing lens  641 , the rotation portion  63 , as the rotating shaft for the laser processing head  65 , can rotate in a rotation direction R 3 . As such, the single-axis pendulum mechanism can be adopted into this disclosure as a practical device for rotating the rotating shaft in the corresponding step of this disclosure. 
     Nevertheless, this disclosure is not limited thereto. In another embodiment, referring to  FIG. 6B , a schematic view of another embodiment of the laser processing device in accordance with this disclosure is shown. In this embodiment, the laser processing device  50  is embodied as a multi-axis pendulum mechanism to include a laser connector  51 , a first part  52 , a second part  53 , a third part  55 , a fourth part  57 , a first rotation portion  54 , a second rotation portion  56  and a laser processing head  58 . In particular, the first part  52 , the second part  53 , the third part  55  and the fourth part  57  are integrated to form a housing for accommodating thereinside the first rotation portion  54  between the first part  52  and the second part  53  as a mechanism of the first rotating shaft, and thereinside also the second rotation portion  56  between the second part  53  and the third part  55  as another mechanism of the second rotating shaft. In addition, the first rotation direction R 1  of the first rotation portion  54  is different from the second rotation direction R 2  of the second rotation portion  56 . In one exemplary example, the laser processing device  50  can be an A-axis processing head, in which the first rotation portion  54  is used as a rotating mechanism of the C axis, and the second rotation portion  56  is used as a rotating mechanism of the A axis. 
     In this embodiment, the optical lens  521  is disposed in the first part  52 , the first mirror  531  is disposed in the second part  53 , the first rotation portion  54  is located between the optical lens  521  and the first mirror  531 , the second mirror  551  is located between the third part  55  and the fourth part  57 , the second rotation portion  56  is located between the first mirror  531  and the second mirror  551 , and the focusing lens  571  is located between the second mirror  551  and the laser processing head  58 . Upon such an arrangement, the laser light transmitted from the laser connector  51  can reach the first mirror  531  via the optical lens  521 . After passing through the first mirror  531  and the second mirror  551 , the laser light would be reflected to the focusing lens  571 , and then leaves the laser processing head  58 . During the laser light is reflected to the focusing lens  571 , the first rotation portion  54  as the first rotating shaft of the laser processing head  58  can rotate in a first rotation direction R 1 , and the second rotation portion  56  as the second rotating shaft of the laser processing head  58  can rotate in a second rotation direction R 2 . In other words, the multi-axis pendulum mechanism can be adopted into this disclosure as a practical device for rotating the first rotation portion  54  or the second rotation portion  56  in the corresponding step of this disclosure. 
     Referring to  FIG. 4  and  FIG. 3 , after Step S 110 , then Step S 120  is performed to apply the focal position-calculating device  140  to calculate a coordinate value value of each of the laser focal positions. By having  FIG. 5A  as an example, the focal position-calculating device  140  is utilized to calculate the coordinate values for the first laser focal position P 3  and the second laser focal position P 4 . In this disclosure, the embodiment of the focal position-calculating device  140  is not limited to calculate only two laser focal positions. In an embodiment not shown herein, three or four laser focal positions can be obtained by rotating the rotating shaft. 
     After the coordinate value for each of the laser focal positions is calculated in Step S 120 , then Step S 130  is performed to have the focal position-calculating device  140  to calculate a target laser focal positions by evaluating the arc path LD 1  and each of the coordinate values of the laser focal positions. By having  FIG. 5B  as example, the focal position-calculating device  140  would determine a circle center position of the arc path LD 1  in accordance with the coordinate value of the first laser focal position P 3 , the coordinate value of the second laser focal position P 4 , and the arc path LD 1 . As shown, the circle center position is the target laser focal position PZ 1 . 
     After the target laser focal position PZ 1  is obtained in Step S 130 , then Step S 140  is performed to have a light modulator  150  to adjust each individual laser focal position to the target laser focal position PZ 1 . By having  FIG. 5B  as an example, since each of the laser focal positions does not coincide with the optical axis of the focusing lens, thus the target laser focal position PZ 1  obtained by performing Step S 110  through Step S 130 , is the optical axis of the focusing lens. Then, the light modulator  150  adjusts the optical axis of the laser light path GL so as to have the second laser focal position 
     P 4  to move to the target laser focal position PZ 1  along the adjustment path LD 3 . Similarly, if the final focal position is at the first laser focal information, then the light modulator  150  would adjust the optical axis of the laser light path GL to move the first laser focal position P 3  to the target laser focal position PZ 1  along the adjustment path LD 2 . 
     Upon the aforesaid arrangement, in this embodiment, in accordance with the at least two laser focal positions of the laser light path and the resulted arc path, it can be determined whether or not the optical axis of the laser light path is oblique. Thus, the real processing is not necessary to observe the focal position. Contrarily, based on the arc path and the coordinate values of the corresponding laser focal positions, the target laser focal position for adjusting the light can be derived. 
       FIG. 7  is a schematic block view of another embodiment of the adjustment device of laser light path in accordance with this disclosure. As shown, it shall be explained that the adjustment device of laser light path  200  of  FIG. 7  is similar to that  100  of  FIG. 3 , in which the same elements are assigned by the same numbers, and details thereabout are omitted herein. In the following description only differences between  FIG. 3  and  FIG. 7  are elucidated. The major difference between the adjustment device of laser light path  200  of  FIG. 7  and the adjustment device of laser light path  100  of  FIG. 3  is at the 2D measuring device  230  in the adjustment device of laser light path  200  of  FIG. 7 . 
     In this embodiment, the 2D measuring device  230 , connected with the laser processing device  120 , can directly measure the 2D coordinate values of the laser focal positions. The 2D measuring device  230  can be, but not limited to, a beam profiler. In other embodiments, the 2D measuring device  230  can be a position-sensitive diode (PSD). 
       FIG. 8  shows schematically a flowchart of another embodiment of the adjustment method of laser light path in accordance with this disclosure.  FIG. 9A  illustrates schematically a step of  FIG. 8 .  FIG. 9B  illustrates schematically another step of  FIG. 8 .  FIG. 9C  illustrates schematically a further step of  FIG. 8 . Referring to  FIG. 8  and  FIG. 7 , the adjustment method of laser light path S 200  includes Step S 210  to 
     Step S 250  as follows. Firstly, the laser source  110  for generating laser light is used to construct a laser light path GL to the laser processing device  120 . Then, referring to  FIG. 9A , Step S 210  is performed to have the laser light path GL to pass through a 2D measuring device  230 , so that a first laser focal position P 41  can be obtained. In other words, the first coordinate value in both a first direction LX and a second direction LY (i.e., the 2D coordinate) for the first laser focal position P 41  where the laser light path GL passes through the 2D measuring device  230  can be measured by the 2D measuring device  230 . 
     In one embodiment, Step S 210  includes a step of: adopting a beam profiler or a position-sensitive diode to be the 2D measuring device  230 . That is, the beam profiler or the position-sensitive diode can be used as the 2D measuring device  230  of this embodiment, but not limited thereto. 
     Then, referring  FIG. 9B , in performing Step S 220 , have the first laser focal position P 41  with the first coordinate value as a starting point to rotate an angle so as to generate a second laser focal position P 42  of the laser light path GL on the 2D measuring device  230 . Thus, an arc path LZ 1  can be formed from the first laser focal position P 41  to the second laser focal position P 42 . 
     In one embodiment, the step of rotating an angle to have laser light path to form a second laser focal position P 42  on the 2D measuring device  230  includes a step of: utilizing the 2D measuring device  230  to determine whether or not an optical axis of a focusing lens is coincided with the first laser focal position. If positive, then no light adjustment is required. Otherwise, the following step is performed to rotate the laser light path GL about the optical axis of the focusing lens from the first laser focal position P 41  (as the starting point of the rotation) so as to obtain the second laser focal position P 42 . It shall be explained that the rotation angle can be 180° for forming the arc path LD 1 . In one embodiment, the aforesaid step can be integrated with the aforesaid single-axis or multi-axis pendulum mechanism, as shown in  FIG. 6A  and  FIG. 6B . 
     After Step S 220 , then, in performing Step S 230 , have the 2D measuring device  230  to obtain a second coordinate value of the second laser focal position P 42  in both the first direction LX and the second direction LY. Then, in performing Step S 240 , based on the first coordinate value of the first laser focal position P 41  and the second coordinate value of the second laser focal position P 42 , a focal position-calculating device  140  is applied to calculate a target laser focal position P 40 . In this disclosure, the embodiment of the focal position-calculating device  140  is not limited to calculate only two laser focal positions. In an embodiment not shown herein, three or four laser focal positions can be obtained by rotating the rotating shaft. 
     After Step S 230  has been performed to calculate the coordinate value for each of the laser focal positions, Step S 240  is performed to have the focal position-calculating device  140  to calculate a target laser focal position according to the arc path LZ 1  and all coordinate values of the corresponding laser focal positions. By having  FIG. 9B  as an example, the focal position-calculating device  140  evaluates the first coordinate value of the first laser focal position P 41 , the second coordinate value of the second laser focal position P 42 , and the arc path LZ 1  to derive a center position of the arc path LX 1  i.e., the target laser focal position P 40 . 
     After Step S 240  has been performed to obtain the target laser focal position P 40 , then Step S 250  is performed to have a light modulator  150  to adjust each of the laser focal positions to the target laser focal position P 40  according to the target laser focal position P 40 . By having  FIG. 9C  as an example, since it is assumed in this disclosure that the laser focal position is not coincided with the optical axis of the focusing lens, thus the target laser focal position P 40  obtained by performing the aforesaid Step S 210  to Step S 240  is deemed as the optical axis of the focusing lens. 
     Then, the light modulator  150  adjusts the optical axis of the laser light path GL by moving the second laser focal position P 42 to the target laser focal position PZ 1  along the adjustment path LZ 2 . Similarly, if the instant focal point falls at the first laser focal position P 41 , then the light modulator  150  adjust the optical axis of the laser light path GL by moving the first laser focal position P 41  to the target laser focal position P 40  along the adjustment path LZ 3 . Of course, in other embodiments, for all the laser focal positions within the circular range C 1  obtained through rotation from the first laser focal position P 41 , the light adjustment can be achieved by performing the aforesaid step. 
       FIG. 10  is a schematic block view of a further embodiment of the adjustment device of laser light path in accordance with this disclosure. As shown, it shall be explained that the adjustment device of laser light path  300  of  FIG. 10  is similar to the adjustment device of laser light path  100  of  FIG. 3  or the adjustment device of laser light path  200  of  FIG. 7 , in which elements with the functions are assigned by the same numbers, and thus details thereabout would be omitted herein. In the following description, only differences between the adjustment device of laser light path  300  of  FIG. 10  and any of the adjustment device of laser light path  100  of  FIG. 3  and the adjustment device of laser light path  200  of  FIG. 7  would be elucidated. The major difference between the device  300  of  FIG. 10  and that  100  of  FIG. 3  or that  200  of  FIG. 7  is that, in  FIG. 10 , the adjustment device of laser light path  300  further has a measuring device  330 . 
     In this embodiment, the 1D measuring device  330 , connected with the laser processing device  120 , provides a given characteristics information. In detail, the measuring device  330  includes a 1D physical characteristics element  332  and an energy measuring element  334 , in which the 1D physical characteristics element  332  in the laser processing device  120  is located between the focusing lens and the energy measuring element  334 . 
     In this embodiment, the 1D physical characteristics element  332  is an element that presents a plurality of different physical characteristics changes in one dimension space (i.e., in a unique direction). For example, those elements with a plurality of different penetration-rate changes in a 1D direction include a continuous filter whose penetration rate is decreased gradually in a longitudinal direction. Namely, the continuous filter is provided with a physical characteristics curve changing information. Since penetration rates of the continuous filter in a particular direction are now given, thus the physical characteristics curve changing information is a given characteristics information. 
     By having  FIG. 12  as an example, a 1D physical characteristics element  70  is disclosed to have different physical characteristics (such as the penetration rate) in the first direction LX. The 1D physical characteristics element  70  includes a first section  71 , a second section  72 , a third section  73  and a fourth section  74 , in which the first section  71 , the second section  72 , the third section  73  and the fourth section  74  stand individually for different physical characteristics in the penetration rate. 
     Further, the penetration rates in the first section  71 , the second section  72 , the third section  73  and the fourth section  74  are increased gradually to demonstrate a 1D energy changing element. Of course, this disclosure is not limited thereto. In an embodiment not shown herein, the first section  71 , the second section  72 , the third section  73  and the fourth section  74  stands orderly for sections with decreasing penetration rates. In another embodiment also not shown herein, the first section  71 , the second section  72 , the third section  73  and the fourth section  74  stands orderly for sections with increasing penetration rates, or interlacing penetration rates. In a further embodiment, the 1D physical characteristics element  70  may include three, five, six, seven or the like number of sections with different physical characteristics. 
     In this embodiment, the energy measuring element  334 , disposed under the 1D physical characteristics element  332 , is used for measuring energy of the laser light travelling along the laser light path GL to pass through the physical characteristics element  332 . The focal position-calculating device  140 , connected with the 1D measuring device  330 , calculate a coordinate value of the laser focal position according to the energy of the laser light travelling along the laser light path GL and the given characteristics information of the physical characteristics curve changing information provided by the 1D physical characteristics element  332 , in which the physical characteristics curve changing information can be the penetration rate with respect to a specific length. 
     In detail, since the energy capacity for the laser light path GL to carry along is given, thus the energy of the laser light passing the 1D physical characteristics element  332  along the laser light path GL can be compared with the energy capacity of the laser light path GL so as to derive the penetration rate according to the detected energy. Then, the coordinate value of the laser focal position can be estimated through the physical characteristics curve changing information of the 1D physical characteristics element  332 . 
       FIG. 11  shows schematically a flowchart of a further embodiment of the adjustment method of laser light path in accordance with this disclosure. Referring to  FIG. 10  and  FIG. 11 , in this embodiment, the adjustment method of laser light path S 300  includes Step S 310  to Step S 370  as follows. Firstly, the laser source  110  is used for generating a laser light path GL to the laser processing device  120  for laser light emitted thereby to travel therealong. Then, in performing Step S 310 , referring to  FIG. 13A  and  FIG. 10 , the laser light path GL passes through a 1D physical characteristics element  332  of a 1D measuring device  330  so as to obtain a first laser focal position P 51  corresponding to the laser light path GL, in which the 1D physical characteristics element  332  has a given characteristics information. 
     In one embodiment, Step S 310  includes a step of: adopting a 1D physical characteristics element  332  who has a plurality of different penetration rates in a 1D direction. For example, in  FIG. 13A ,  FIG. 14A  and  FIG. 15A , the 1D physical characteristics element  332  includes a plurality of different penetration rates in the first direction LX. 
     In addition, Step S 310  further includes a step of: adopting a physical characteristics curve changing information having relationships between the lengths and the penetration rates as the given characteristics information. For example, the 1D physical characteristics element  332  is an element having changes of a plurality of different penetration rates in a 1D direction, such as a continuous filter who has the physical characteristics curve changing information of lengths with respect to the penetration rates. Since the continuous filter has different given penetration rates along a direction, thus the physical characteristics curve changing information can be seen as a given characteristics information. 
     Referring to  FIG. 11 , in performing Step S 320  after Step S 310 , an energy measuring element  334  of the 1D measuring device  330  is applied to measure a first energy at the laser light path GL. Then, in performing Step S 330 , referring to  FIG. 10 ,  FIG. 13B  and  FIG. 13C , a focal position-calculating device  140  is applied to calculate a first coordinate value of a first laser focal position P 51  according to the given characteristics information and the first energy of the laser light path GL. 
     In detail, Step S 330  includes a step of: evaluating the first energy at the first laser focal position P 51  to derive the first penetration rate of the laser light path GL passing the 1D physical characteristics element  332 . According to the physical characteristics curve changing information provided by the 1D physical characteristics element  332  and the first penetration rate, the first coordinate value of the first laser focal position P 51  in the first direction LX can be obtained. Since the energy capacity for the laser light path GL to carry along is given, thus the energy of the laser light passing the 1D physical characteristics element  332  along the laser light path GL can be compared with the energy capacity of the laser light path GL so as to derive the penetration rate according to the detected energy. 
     For example, as shown in  FIG. 13B , the physical characteristics curve changing information for the penetration rate T with respect to the length L of the 1D physical characteristics element  332  is provided. Based on the first penetration rate T 1  of the first laser focal position P 51  derived previously, and further the first penetration rate T 1  in  FIG. 13B , the length L in the first direction LX is the first length L 1 . From  FIG. 13C , the X coordinate value of the first laser focal position P 51  in the first direction LX is the value of the first length L 1 . 
     Then, after Step S 330 , then Step S 340  is performed. Referring to  FIG. 10  and 
       FIG. 14A , have the first laser focal position P 51  with the first coordinate value as a starting point to rotate an angle so as to generate a second laser focal position P 52  of the laser light path GL and a corresponding second energy on the 1D physical characteristics element  332 . Thus, an arc path C 6  can be formed from the first laser focal position P 61  to the second laser focal position P 62 . 
     It shall be explained that, in Step S 340 , the rotation angle can be 180° for forming the arc path LD 1 . In one embodiment, the aforesaid step can be integrated with the aforesaid single-axis or multi-axis pendulum mechanism, as shown in  FIG. 6A  and  FIG. 6B . In one embodiment, Step S 340  includes a step of: utilizing an energy measuring element  334  in the 1D measuring device  330  to measure a second energy at the second laser focal position P 52  of the laser light path GL. 
     After Step S 340 , then in performing Step S 350 , referring to  FIG. 10 ,  FIG. 14B  and  FIG. 14C , a focal position-calculating device  140  is used to calculate a second coordinate value of a second laser focal position P 52  according to the given characteristics information and the second energy of the laser light path GL. 
     In detail, Step S 350  includes the step of: as shown in  FIG. 14B , evaluating the second energy of the second laser focal position P 52  to derive the second penetration rate T 2  of the laser light path GL while passing through the 1D physical characteristics element  332 . Then, based on the physical characteristics curve changing information and the second penetration rate T 2  provided by the 1D physical characteristics element  332 , the second coordinate value of the second laser focal position P 52  in the first direction LX can be obtained. With the second length L 2 , i.e., the length L of the second laser focal position P 52  in the first direction LX, then, as shown in  FIG. 14C , the X coordinate value of the second laser focal position P 52  in the first direction LX is the value of the second length L 2 . 
     After Step S 350 , in performing Step S 360 , referring to  FIG. 10  and  FIG. 15A , a focal position-calculating device  140  is utilized to calculate a target laser focal position P 53  according to the first coordinate value of the first laser focal position P 51  and the second coordinate value of the second laser focal position P 52 . Step S 350  includes the step of: the focal position-calculating device  140  evaluating the first coordinate value of the first laser focal position P 51 , the second coordinate value of the second laser focal position P 52 , and the arc path C 4  to derive the third coordinate value of the center position of the arc path C 4 , in which the center position is the target laser focal position P 53 . As shown in  FIG. 15A , the first laser focal position P 51  is spaced from the target laser focal position P 53  in the first direction LX is a first distance L 31 , the second laser focal position P 52  is spaced from the target laser focal position P 53  in the first direction LX is a second distance L 32 , and the first distance L 31  is equal to the second distance L 32 . The third coordinate value of the target laser focal position P 53  in the first direction LX is defined as a third length L 3 . Then, based on the physical characteristics curve changing information provided by the 1D physical characteristics element  332  and the third length L 3  of the target laser focal position P 53 , the third penetration rate T 3  of the target laser focal position P 53  in the first direction LX can be obtained. Further, based on the energy at the laser light path GL after passing the 1D physical characteristics element  332  and the third penetration rate T 3 , an energy adjustment value can be derived in a reverse manner. 
     From the aforesaid Step S 310  to Step S 360 , the target laser focal position P 53  can be derived, and this position is the position of the optical axis of the focusing lens. In performing Step S 370 , referring to  FIG. 10  and  FIG. 15C , based on the target laser focal position P 53 , a light modulator  150  is utilized to adjust the first laser focal position P 51  and the second laser focal position P 52  to the target laser focal position P 53 . 
     Practically, since at the present time only the third coordinate value of the target laser focal position P 53  in the first direction LX is known, thus the inclination angle of the optical axis of the laser light path GL can be adjusted according to the aforesaid derived energy adjustment value, so that the adjustment value to satisfy the demand can be obtained. Accordingly, the second laser focal position P 52  would be moved to a second target laser focal position P 55 . Similarly, if at the present time the final focal position is at the first laser focal position P 51 , the light modulator  150  would adjust the optical axis of the laser light path GL to move the first laser focal position P 51  to a first target laser focal position P 54 , in which the first target laser focal position P 54 , the second target laser focal position P 55  and the target laser focal position P 53  are connected to form a straight line A 5  in the second direction LY. Namely, the coordinate values of the first target laser focal position P 54 , the second target laser focal position P 55  and the target laser focal position P 53  are the same in the first direction LX. Of course, in some other embodiments, for all the laser focal positions within the circular range C 5  obtained through rotation from the first laser focal position P 51 , the light adjustment can be achieved by performing the aforesaid step. 
     After completing Step S 370  for light adjustment in the first direction LX, a following step is further included to rotate the 1D physical characteristics element  332  by an angle, 90° for example, so as to furnish the 1D physical characteristics element  332  with a plurality of different penetration rate changes in the second direction LY. In other words, from  FIG. 13A  to  FIG. 15C , the light adjustment in the second direction LY is achieved through the plurality of different penetration rate changes of the 1D physical characteristics element  332  in the first direction LX. After the 1D physical characteristics element  332  is rotated by a 90° to switch a state that the 1D physical characteristics element  332  has a plurality of different penetration rates in the first direction LX into another state that the 1D physical characteristics element  332  has a plurality of different penetration rates in the second direction LY. Namely, the 1D physical characteristics element  332  in  FIG. 16A ,  FIG. 17A  or  FIG. 18A  would have a plurality of different penetration rates in the second direction LY. Hence, the laser light path GL is in correspondence with a plurality of different penetration rate changes in the second direction LY. 
     In this embodiment, after the aforesaid step to rotate the 1D physical characteristics element  332  by 90°, then repeat Step S 310  to Step S 370 . Referring to  FIG. 10  and  FIG. 16A , the laser light path GL passes through the 1D physical characteristics element  332  in the 1D measuring device  330  so as to obtain the first laser focal position P 61  corresponding to the laser light path GL (Step S 310 ), an energy measuring element  334  is applied to measure the first energy of the laser light path GL (Step S 320 ), and then the focal position-calculating device  140  is utilized to calculate the first coordinate value of the first laser focal position P 61  according to the given characteristics information and the first energy of the laser light path GL (Step S 330 ). 
     In addition, the first penetration rate T 4  of the first laser focal position P 51  can be obtained accordingly. Further, from the first penetration rate T 4  of  FIG. 16B . it can be seen that the length L in the second direction LY is the first length L 4 . Also, as shown in  FIG. 16C , the Y coordinate value of the first laser focal position P 61  in the second direction LY is the first length L 4 . 
     Then, have the first laser focal position P 6  with the first coordinate value as the starting point to rotate an angle so as to have the laser light path GL furnished with a second laser focal position P 62  and a corresponding second energy on the 1D physical characteristics element  332  (Step S 340 ), in which the rotation angle can be 180°. Similarly, based on the given characteristics information and the second energy of the laser light path GL, a focal position-calculating device  140  is utilized to calculate the second coordinate value of the second laser focal position P 62 . The second penetration rate T 5  of the laser light path GL passing through the 1D physical characteristics element  332  can be derived from the second energy of the second laser focal position P 62 . Based on the physical characteristics curve changing information provided by the 1D physical characteristics element  332  and the second penetration rate T 5 , the second coordinate value of the second laser focal position P 62  in the second direction LY can be obtained. Following the steps to determine that the length L of the second laser focal position P 62  in the second direction LY is the second length L 5 , as shown in  FIG. 17C , the Y coordinate value of the second laser focal position P 62  in the second direction LY is the value of the second length L 5 . 
     Then, the focal position-calculating device  140  is used to calculate a target laser focal position P 63  according to the first coordinate value of the first laser focal position P 61  and the second coordinate value of the second laser focal position P 62  (Step S 350 ). As shown in  FIG. 17A , the first laser focal position P 61  is spaced from the target laser focal position P 63  in the second direction LY by the first distance L 41 , the second laser focal position PY 2  is spaced from the target laser focal position P 63  in the second direction LY by the second distance L 42 , and the first distance L 41  is equal to the second distance L 42 . In addition, the third coordinate value of the target laser focal position P 63  in the second direction LY is defined to be a third length L 6 . Thereupon, based on the physical characteristics curve changing information provided by the 1D physical characteristics element  332  and the third length L 6  of the target laser focal position P 63 , the third penetration rate T 6  of the target laser focal position P 63  in the second direction LY can be obtained. Further, an energy adjustment value can be derived in a reverse manner according to the energy of the laser light path GL after passing through the 1D physical characteristics element  332  and the third penetration rate T 6 . 
     Finally, based on the target laser focal position P 63 , the light modulator  150  is utilized to adjust the second laser focal position P 62  to the target laser focal position P 63 . In some other embodiments, for all the laser focal positions within the circular range C 7  obtained through rotation from the first laser focal position P 61 , the light adjustment can be achieved by performing the aforesaid step. 
     In summary, through the steps for providing at least two laser focal positions of the laser light path and the resulted arc path formed by the at least two laser focal positions in accordance with this disclosure, it can be determined whether or not the optical axis of the laser light path is oblique. Thus, real processing is not necessary to observe the focal position. In addition, based on the arc path and the coordinate values of the corresponding laser focal positions, the target laser focal position to satisfy the demand in light adjustment can be obtained. 
     With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the disclosure, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present disclosure.