CN110434472A

CN110434472A - Laser marking device and its focus adjustment method

Info

Publication number: CN110434472A
Application number: CN201910623314.XA
Authority: CN
Inventors: 陈略; 冯磊; 任宁; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd
Current assignee: Han s Laser Technology Industry Group Co Ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2019-11-12
Anticipated expiration: 2039-07-11
Also published as: CN110434472B

Abstract

The present invention provides a kind of laser marking device and its focus adjustment methods, which comprises exchanges focus lens according to the first correcting value and positioning the distance between zero point carries out coarse adjustment and obtains the first mark figure；When the first graphic parameter for confirming the corresponding with focal position to be determined first mark figure is best, the progress fine tuning of the distance between focus lens and positioning zero point is exchanged according to the second correcting value；Difference between confirmation corresponding with each figure distributing position each second the second graph parameter of mark figure is respectively less than preset difference value threshold value, and corresponding with focal position to be determined second mark figure second graph parameter it is best when, confirm that second compensation rate corresponding with focal position to be determined is focus compensation rate；Eyeglass of focusing is adjusted to the focal position of focal position to be determined according to focus compensation rate.The present invention greatly improves the accuracy that laser marking device determines focus, easy to operate, improves the operation stability of equipment.

Description

Laser marking device and its focus adjustment method

Technical field

The invention belongs to laser marking technical fields, are to be related to a kind of focusing side of laser marking device more specifically Method.

Background technique

Laser marking device respectively in mark plane mark location A point and B point carry out mark respectively when, due to reason The laser thought, which focuses, a unique most thin focus point (i.e. focus), but when A point and B point carry out mark respectively, two are beaten The focal length that cursor position corresponds to laser focusing can change, at this point, focal position does not change therewith if mark location switches Become, will lead to mark plane not is to work in optimal focus, and then cause mark lines thicker or mark effect variation. Referring to Fig. 8, the laser beam that the laser 1 in laser mark printing device in the prior art emits sequentially passes through focusing eyeglass 21 and gathers It after focus lens 3, is exposed to via the deflection of galvanometer 4 and carries out mark in mark plane 6, at this point, repeatedly by manual adjustment handwheel 7 Position of the dynamic focus control 2 comprising eyeglass 21 of focusing on the first guide rail 5 is adjusted, and then adjusts laser beam 1 most It is irradiated to the height of the focal position in mark plane 6 eventually.The program is disadvantageous in that: firstly, since machining dress With the factors such as error and handwheel greasy property, it is desirable to by manual adjustment handwheel 7 come so that final focal position adjusting The standard compliant error range of error (within 0.1mm) is difficult to realize, meanwhile, it how does not provide in the program to mark The problem of coordinate of specific focal position in plane 6 is adjusted；Further, the focal spot height of focal position is completed After adjusting, if handwheel is locked, hand wheel lock can be led to due to pit, friction, gap etc. during the locking Specific focal position in the mark plane of tight front and back generates deviation, and it is next not accurate by specific focal position to result in hand wheel lock The variation of caused mark effect；If handwheel is not locked, since the board of laser marking device shakes and artificially misses It the reasons such as touches, may result in specific focal position and change when operator is unwitting, can similarly bring and beat Mark variation even other hidden danger of effect.

Summary of the invention

The purpose of the present invention is to provide a kind of laser marking device and its focus adjustment methods, and laser marking can be substantially improved Equipment determines the accuracy of focus, and easy to operate, stable.

To achieve the above object, the technical solution adopted by the present invention is that: a kind of focus adjustment method of laser marking device is provided, Include:

Determine at least one figure distributing position corresponding with mark figure in mark plane；Wherein, all figures One of them described figure distributing position in distributing position is focal position to be determined；

According to preset first correcting value, the distance between focusing eyeglass and positioning zero point to laser marking device are carried out Coarse adjustment, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure；

With each figure distributing position corresponding described first mark figure, confirm and the focus to be determined When first graphic parameter of the mark figure of position corresponding described first is best, according to preset second correcting value, to laser The distance between the focusing eyeglass of marking equipment and positioning zero point carry out fine tuning, and obtain fine tuning and be distributed later with each figure The mark figure of position corresponding second；Second correcting value is less than first correcting value；

Confirmation with each figure distributing position corresponding each described second mark figure second graph parameter it Between difference be respectively less than preset difference value threshold value, and with the focal position corresponding described second to be determined mark figure When two graphic parameters are best, confirmation second compensation rate corresponding with the focal position to be determined is focus compensation rate；Institute State focus compensation rate refer to the focal position to be determined be focal position when, between the focusing eyeglass and the positioning zero point Distance；

The focusing eyeglass is adjusted to the focal position of the focal position to be determined according to the focus compensation rate.

Further, described according to preset first correcting value, focusing eyeglass and positioning zero point to laser marking device The distance between carry out coarse adjustment, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure, packet It includes:

It is determined according to preset first correcting value and carries out each mark figure of mark in each figure distributing position The first compensation rate；First compensation rate refers to the focusing eyeglass of laser marking device in the second guide rail being slidably connected with it The upper coarse range for the first time between positioning zero point；

First correction position of the focusing eyeglass on second guide rail is adjusted according to first compensation rate, and will The first correction position is associated with each figure distributing position；

The mark described in the figure distributing position mark corresponding with the first correction position in the mark plane Figure, and be the first mark figure by the mark graphic recording of each figure distributing position mark.

Further, the figure distributing position corresponding with the first correction position in the mark plane Mark figure described in mark, and be the first mark figure by the mark graphic recording of each figure distributing position mark Later, further includes:

It is not with the first graphic parameter of the focal position corresponding described first to be determined mark figure in confirmation When best, using corresponding first compensation rate of optimal first graphic parameter as new the of the focal position to be determined One compensation rate, and redefined according to first correcting value in other described figures in addition to the focal position to be determined Distributing position carries out the first new compensation rate of each mark figure of mark；The first new compensation rate refers to the tune Secondary coarse range between focus lens and the positioning zero point；

New first correction of the focusing eyeglass on second guide rail is adjusted according to the first new compensation rate Position, and the first new correction position is associated with each figure distributing position；

In the mark plane described in the figure distributing position mark corresponding with the first new correction position Mark figure, and be the new first mark figure by the mark graphic recording of each figure distributing position mark.

Further, described according to preset second correcting value, focusing eyeglass and positioning zero point to laser marking device The distance between carry out fine tuning, and obtain after fine tuning with each figure distributing position corresponding second mark figure, packet It includes:

Using corresponding first compensation rate of optimal first graphic parameter as in the focal position to be determined The second compensation rate of the mark figure of mark is carried out, and is determined according to preset second correcting value and is removing the coke to be determined Other described figure distributing positions except point position carry out the second compensation rate of each mark figure of mark；Described second Compensation rate refers to the fine tuning distance for the first time between the focusing eyeglass and the positioning zero point；

Second correction position of the focusing eyeglass on second guide rail is adjusted according to second compensation rate, and will The second correction position is associated with each figure distributing position；

The mark described in the figure distributing position mark corresponding with the second correction position in the mark plane Figure, and be the second mark figure by the mark graphic recording of each figure distributing position mark.

Further, the figure distributing position corresponding with the second correction position in the mark plane Mark figure described in mark, and be the second mark figure by the mark graphic recording of each figure distributing position mark Later, further includes:

Confirm at least one with each figure distributing position corresponding each described second second figure of mark figure Difference between shape parameter is greater than or equal to preset difference value threshold value, or with the focal position corresponding described second to be determined When the second graph parameter of mark figure is not best, using corresponding second compensation rate of the optimal second graph parameter as The second new compensation rate of the focal position to be determined, and redefined according to second correcting value except described to be determined Other described figure distributing positions except focal position carry out the second new compensation rate of each mark figure of mark；Institute It states the second new compensation rate and refers to the focusing eyeglass and the secondary fine tuning distance positioned between zero point；

New second correction of the focusing eyeglass on second guide rail is adjusted according to the second new compensation rate Position, and the second new correction position is associated with each figure distributing position；

In the mark plane described in the figure distributing position mark corresponding with the second new correction position Mark figure, and be the new second mark figure by the mark graphic recording of each figure distributing position mark.

Further, described that the focusing eyeglass is adjusted to by the focal position to be determined according to the focus compensation rate Focal position, comprising:

Control the focal position that the focusing eyeglass is moved to the focal position to be determined on second guide rail, institute The focal position for stating focal position to be determined refers to the focusing eyeglass on second guide rail between the positioning zero point Actual range be equal to the position of the sum of theoretical distance and described focus compensation rate.

Further, first graphic parameter include first the line weight of mark figure, calcination area and burn side One of size is a variety of；The second graph parameter includes the second line weight of mark figure, calcination area and burning One of side size is a variety of.

Further, the first graphic parameter of the described first mark figure is best, comprising:

The lines of described first mark figure are most thin；Or/and described first mark figure calcination area it is minimum； Or/and described first mark figure burning side it is minimum；

The second graph parameter of described second mark figure is best, comprising:

The lines of described second mark figure are most thin；Or/and described second mark figure calcination area it is minimum； Or/and described second mark figure burning side it is minimum.

Further, first correcting value is 0.2 millimeter, and second correcting value is 0.05 millimeter.

The present invention also provides a kind of laser marking devices, including control device, laser, dynamic focus control, focus lamp Piece and galvanometer, the dynamic focus control include focus eyeglass and with second guide rail that is slidably connected of focusing eyeglass；Institute State laser transmitting laser beam sequentially pass through the focusing eyeglass and focusing lens after, via the galvanometer deflect expose to Mark is carried out in mark plane；The control device connects the dynamic focus control and the laser, and the control fills It sets the control focusing eyeglass to move on second guide rail, so that will carry out by laser beam in the mark plane The focal position to be determined of mark is in focal position；

The control device includes:

Determining module determines at least one figure distributing position corresponding with mark figure in mark plane；Wherein, own One of them described figure distributing position in the figure distributing position is focal position to be determined；

Coarse adjustment module, for the focusing eyeglass and positioning zero point according to preset first correcting value, to laser marking device The distance between carry out coarse adjustment, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure；

Fine tuning module, for in each figure distributing position corresponding described first mark figure, confirmation with When first graphic parameter of the focal position to be determined corresponding described first mark figure is best, according to preset second Correcting value carries out fine tuning to the distance between focusing eyeglass of laser marking device and positioning zero point, and obtain after fine tuning with Each figure distributing position corresponding second mark figure；Second correcting value is less than first correcting value；

Determining module is compensated, in confirmation and each figure distributing position corresponding each described second mark figure Second graph parameter between difference be respectively less than preset difference value threshold value, and with the focal position corresponding described to be determined When the second graph parameter of two mark figures is best, confirmation second compensation rate corresponding with the focal position to be determined For focus compensation rate；The focus compensation rate refer to the focal position to be determined be focal position when, the focusing eyeglass and The distance between described positioning zero point；

Adjustment module, for the focusing eyeglass to be adjusted to the focal position to be determined according to the focus compensation rate Focal position.

The focus adjustment method of laser marking device of the present invention, by focusing eyeglass to laser marking device and positioning zero point it Between distance successively carry out coarse adjustment and fine tuning, determine that the focus the distance between exchanged focus lens and position zero point and compensate is mended The amount of repaying, and then the focal position of focal position to be determined is adjusted to according to the focus compensation rate eyeglass that will focus.The present invention is substantially Improve the accuracy that laser marking device determines focus, air exercise mark on a map shape mark effect requirements it is higher or air exercise mark on a map The line thickness of shape requires have stronger practicability in thinner mark figure application；And coarse adjustment and fine tuning etc. of the invention Focus adjustment procedure intelligent can be run, easy to operate, also improve the operation stability of equipment；In addition, the present invention is applicable in Range is wide, can conveniently be applicable in for the mark material of different-thickness.

Detailed description of the invention

It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is the flow chart of the focus adjustment method of laser marking device provided in an embodiment of the present invention；

Fig. 2 is the flow chart of the step S20 of the focus adjustment method of laser marking device provided in an embodiment of the present invention；

Fig. 3 be another embodiment of the present invention provides laser marking device focus adjustment method step S20 flow chart；

Fig. 4 is the flow chart of the step S30 of the focus adjustment method of laser marking device provided in an embodiment of the present invention；

Fig. 5 be another embodiment of the present invention provides laser marking device focus adjustment method step S30 flow chart；

Fig. 6 is the mark pictorial diagram of one example of focus adjustment method of laser marking device provided by the invention；

Fig. 7 be laser marking device provided in an embodiment of the present invention focus adjustment method mark figure and with mark figure Corresponding figure distributing position schematic diagram；

Fig. 8 is the structural schematic diagram of laser marking device provided in an embodiment of the present invention.

Specific embodiment

In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only To explain the present invention, it is not intended to limit the present invention.

It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element On one element or indirectly on another element.When an element is known as " being connected to " another element, it can To be directly to another element or be indirectly connected on another element.

It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more, Unless otherwise specifically defined.

Now the focus adjustment method of laser marking device provided by the invention is illustrated.In an embodiment of the present invention, swash Light marking equipment includes control device (not shown) and laser shown in fig. 81, dynamic focus control 2, focusing lens 3 With galvanometer 4, the dynamic focus control 2 includes focusing eyeglass 21 and second leads 22 with what the focusing eyeglass 21 was slidably connected Rail；Second guide rail 22 of dynamic focus control 2 can along 5 points of the first guide rail to sliding (that is, can be by adjusting the second guide rail 22 and the first relative positional relationship between guide rail 5, position of the dynamic focus control 2 on the first guide rail 5 is adjusted), Understandably, above-mentioned focusing eyeglass 21 or/and focusing lens 3 can be single eyeglass or focusing microscope group；The laser 1 emits Laser beam sequentially pass through the focusing eyeglass 21 and focusing lens 3 after, via the galvanometer 4 deflection expose to mark plane Mark is carried out on 6；The control device connects the dynamic focus control 2 and the laser 1, and the control device is used for The focus adjustment method of the laser marking device is executed, that is, the control device controls the focusing eyeglass 21 described second It is moved on guide rail 22, so that will be in by the focal position to be determined that laser beam 1 carries out mark in the mark plane 6 Focal position.

Referring to Fig. 1, the focus adjustment method of the laser marking device, includes the following steps S10-S50:

S10 determines at least one figure distributing position corresponding with mark figure in mark plane；Wherein, all described One of them described figure distributing position in figure distributing position is focal position to be determined；Wherein, the figure is distributed position One or more can be set as according to demand by setting, but in one or more figure distributing position, it is necessary to it include one Focal position to be determined；The focal position to be determined is to need accurately to be looked for focus in working region in mark plane Position (that is, in the above-mentioned mark figure of laser marking device mark, need that the focal position to be determined is enabled to be in focus position The position set).Mark figure can be set as may be easy to identify that the figure of its mark effect (namely is easier to reflect according to demand Whether the graphic parameter for determining the mark figure after mark is best, for example, it is clearly simple that mark figure is set as pattern line Figure).

S20, according to preset first correcting value, the distance between focusing eyeglass and positioning zero point to laser marking device Carry out coarse adjustment, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure；Wherein, described first Correcting value can be set according to demand, preferably, first correcting value is 0.2 millimeter.Positioning zero point is then set at second The location point of a zero-bit on guide rail.The distance between focusing eyeglass and positioning zero point to laser marking device carry out thick Adjust, can complete to look for the process of focus roughly to focal position to be determined, after the process was complete (that is, confirmation with After first graphic parameter of the focal position to be determined corresponding described first mark figure is best), allow focus position Set between the focal position to be determined that there is also certain deviations, as long as guaranteeing big when focal position to be determined carries out mark Generally in focal position.

S30, in each figure distributing position corresponding described first mark figure, confirmation with it is described to be determined It is right according to preset second correcting value when first graphic parameter of the mark figure of focal position corresponding described first is best The distance between the focusing eyeglass of laser marking device and positioning zero point carry out fine tuning, and obtain after fine tuning with each figure The mark figure of distributing position corresponding second；Second correcting value is less than first correcting value；Wherein, second school Positive quantity can be set according to demand, preferably, second correcting value is 0.05 millimeter.Understandably, laser marking is set The distance between standby focusing eyeglass and positioning zero point carry out fine tuning, can complete accurately to look for focus to focal position to be determined Process, after the process was complete (that is, in confirmation each described second mark corresponding with each figure distributing position Difference between the second graph parameter of figure is respectively less than preset difference value threshold value, and institute corresponding with the focal position to be determined State the second mark figure second graph parameter it is best after), focal position is the focal position to be determined.

Further, first graphic parameter including but not limited to be first the line weight of mark figure, burn Burn one of area and burning side size or a variety of；At this point, in the step S30, the first figure of the described first mark figure Shape parameter is best, comprising: the lines of the described first mark figure are most thin；Or/and described first mark figure calcination face Product is minimum；Or/and described first mark figure burning side it is minimum.That is, when whether the first graphic parameter of judge best, if First graphic parameter only includes line weight, then all first lines are most thin in mark figure is best；If the first figure Parameter only includes calcination area, then all first calcination area is the smallest in mark figure is best；If the first graphic parameter Only comprising burning side size, then all first it is the smallest to burn side in mark figure is best.Similarly, if first graphic parameter Including first the line weight of mark figure, calcination area and burn side size in it is a variety of, then need Comprehensive Assessment above-mentioned several The particular state of parameter.Understandably, the lines for judging the described first mark figure are most thin, the described first mark figure Calcination area is minimum, the burning side of the described first mark figure is minimum, can rule of thumb be judged by operator；It can also Each parameter of preference setting weight shared in whether the first graphic parameter of judge is best, and then there have control device to obtain to be each described First after mark figure, and the parameter value of each parameter, and then the ginseng obtained according to image recognition are determined by image recognition The weight of numerical value and each parameter of above-mentioned setting finally to calculate determine whether the first graphic parameter is best, in this way, being not necessarily to people Work is determined, it is only necessary to by camera obtain first the image of mark figure compare and analyze and can intelligently complete this Decision process.

S40, confirmation with each figure distributing position corresponding each described second mark figure second graph ginseng Difference between number is respectively less than preset difference value threshold value, and with the focal position corresponding described second to be determined mark figure Second graph parameter it is best when, confirmation second compensation rate corresponding with the focal position to be determined is that focus compensates Amount；When the focus compensation rate refers to that the focal position to be determined is focal position, the focusing eyeglass and the positioned zero The distance between point.The size of the focus compensation rate directly influences the levels of precision for looking for focus, in the present invention, by thick The fine tuning that reconciles determines the focus compensation rate, improves the accuracy of focal position.Further, the second graph parameter includes But it is not limited to the line weight of mark figure, calcination area and burn one of side size or a variety of for second.At this point, institute It states in step S40, the second graph parameter of the described second mark figure is best, comprising: the line of the described second mark figure Item is most thin；Or/and described second mark figure calcination area it is minimum；Or/and described second mark figure burning side most It is small.That is, when whether judge second graph parameter best, if second graph parameter only includes line weight, all second It is best that lines are most thin in mark figure；If second graph parameter only includes calcination area, all second mark figures It is best that calcination area is the smallest in shape；If second graph parameter only includes to burn side size, all second in mark figure It is best that it is the smallest, which to burn side,.Similarly, if the second graph parameter includes the second line weight of mark figure, calcination area It is a variety of in the size of side with burning, then need the particular state of the above-mentioned several parameters of Comprehensive Assessment.Understandably, described second is judged The lines of mark figure are most thin, the calcination area of the described second mark figure is minimum, the burning side of the described second mark figure Minimum can rule of thumb be judged by operator；Also second graph parameter can judged whether with each parameter of preference setting Shared weight in best, and then there is control device to obtain each described second after mark figure, pass through image recognition and determines The parameter value of each parameter, and then according to the weight of image recognition parameter value obtained and each parameter of above-mentioned setting come final It calculates and determines whether second graph parameter is best, in this way, without manually being determined, it is only necessary to obtain second by camera The image of mark figure, which compares and analyzes, can intelligently complete the decision process.

Similarly, the size of the preset difference value threshold value can be set according to demand, each described second mark figure Second graph parameter between difference whether be less than the judgement of preset difference value threshold value, be to need to first correspond in the second mark It (according to demand, includes several parameters in second graph parameter that line weight, calcination area and the burning side size of figure, which are respectively set, I.e. corresponding to set several differences, it is not limited to be three) lines difference threshold, a calcination area difference threshold and to burn side poor It is worth threshold value, later, it is poor judges described in any two whether the second difference between the line weight of mark figure is less than lines Whether the difference whether price difference between value threshold value, calcination area is less than between calcination area difference threshold, burning side size is less than Lines difference threshold, and then judge whether the difference between second graph parameter is less than preset difference value threshold value；Understandably, own It include that several parameters are respectively less than (the mark figure of any two second in the second second graph parameter that mark figure has included Parameter difference between second graph parameter is respectively less than) corresponding difference threshold can determine whether the difference between second graph parameter Less than preset difference value threshold value.

The focusing eyeglass is adjusted to the focus position of the focal position to be determined according to the focus compensation rate by S50 It sets.Further, the step S50, namely according to the focus compensation rate be adjusted to the focusing eyeglass described to be determined The focal position of focal position, comprising:

Control the focal position that the focusing eyeglass is moved to the focal position to be determined on second guide rail, institute The focal position for stating focal position to be determined refers to the focusing eyeglass on second guide rail between the positioning zero point Actual range be equal to the position of the sum of theoretical distance and described focus compensation rate.Understandably, in the present embodiment, the reality Border distance can be calculated according to following steps.First according to the following formula determine focusing eyeglass and focusing lens between away from From L:

F3=F1*F2/L

Wherein, F1 is the focal length of focusing eyeglass；F2 is the focal length of focusing lens；F3 is that laser marking device carries out mark When, the distance between the focal position to be determined of focusing lens to mark plane.

Since the second guide rail is fixed with focusing lens, between the positioning zero point on focusing lens to the second guide rail Distance can be determined, the variation of focusing eyeglass and the distance between focusing lens is to follow to focus eyeglass on the second guide rail Slide it is changed, therefore, according to focusing the distance between eyeglass and focusing lens and focusing lens to the second guide rail on The distance between positioning zero point can determine that positioning zero point to the distance between eyeglass of focusing, finally determines according to the following formula Actual range of the focusing eyeglass on second guide rail between the positioning zero point:

Q=L-M+a

Wherein, Q is focusing eyeglass and the actual range for positioning zero point；L is focusing the distance between eyeglass and focusing lens； M is focusing lens at a distance from positioning zero point；A is focus compensation rate.

Understandably, theoretical distance=L-M of the focusing eyeglass on second guide rail between the positioning zero point, swashs It is mobile according to the actual range on second guide rail that the control device of light marking device controls the focusing eyeglass Determine the focal position of focal position to be determined.

The beneficial effect of the focus adjustment method of laser marking device provided by the invention is: by laser marking device The distance between focusing eyeglass and positioning zero point successively carry out coarse adjustment and fine tuning, determine and exchange focus lens and position between zero point The focus compensation rate that distance compensates, and then focusing eyeglass is adjusted to by focal position to be determined according to the focus compensation rate Focal position.The present invention greatly improves the accuracy that laser marking device determines focus, marks on a map the mark effect of shape in air exercise More demanding or air exercise mark on a map shape line thickness requirement thinner mark figure application in, have stronger practicability；And The focus adjustment procedures such as coarse adjustment and fine tuning of the invention intelligent can be run, namely be filled by the control of laser marking device It sets, can control the focusing eyeglass 21 in dynamic focus control 2 and slided on the second guide rail 22 according to the focus compensation rate, nothing Manual operation is needed, degree of regulation will be significantly improved, while it is also possible that the adjusting error of focal position can accord with The error range of standardization (within 0.1mm).

Understandably, the height below for focal position (namely focal position to be determined) referred in background technique Adjustment process is (that is, by manual adjustment handwheel 7 repeatedly to the dynamic focus control 2 comprising eyeglass 21 of focusing in the first guide rail 5 On position be adjusted, and then adjust laser beam 1 and be finally irradiated to the height of the focal position in mark plane 6), need It is carried out before the focus adjustment method of laser marking device provided by the invention, in this way, making the scope of application of the laser marking device Extensively, it can conveniently can be applicable in for the mark material of different-thickness.And it completes the height adjustment of focal position and is locking hand After wheel 7, even if focal position to be determined is not in focal position (namely and focal position there are deviations), it can also pass through Focusing eyeglass is adjusted to focus to be determined according to the focus compensation rate by the focus adjustment method of above-mentioned laser marking device of the invention The focal position of position produces in this way, the handwheel in the height adjustment of focal position can be made to adjust focus point accuracy Raw adverse effect no longer exists, and operation of the present invention is easy, also improves the operation stability of equipment.Understandably, one In a little embodiments, laser marking device of the invention directly controls the dynamic by control device without setting handwheel Focus control 2 it is whole on the first guide rail 5 (or on other components) it is mobile also can, so further improve its focal adjustments Intelligence degree and precision.

Further, as shown in Fig. 2, the step S20, namely according to preset first correcting value, laser marking is set The distance between standby focusing eyeglass and positioning zero point carry out coarse adjustment, and obtain after coarse adjustment with each figure distributing position pair First answered mark figure, comprising:

S201 is determined according to preset first correcting value and is carried out each mark of mark in each figure distributing position First compensation rate of figure；First compensation rate refers to the focusing eyeglass of laser marking device in second to be slidably connected with it Coarse range for the first time on guide rail between positioning zero point；

S202 adjusts first correction bit of the focusing eyeglass on second guide rail according to first compensation rate It sets, and the first correction position is associated with each figure distributing position；

S203, in the mark plane described in the figure distributing position mark corresponding with the first correction position Mark figure, and be the first mark figure by the mark graphic recording of each figure distributing position mark.

In this embodiment, it is first to illustrate that the distance between focusing eyeglass and the positioning zero point to laser marking device carries out The process of secondary coarse adjustment, if coarse adjustment for the first time complete after, can confirm with the focal position corresponding described first to be determined First graphic parameter of mark figure is best, can be directly entered the fine-tuning process of step S30 at this time.

Further, as shown in figure 3, after the step S203, namely in the mark plane with first school Mark figure described in the corresponding figure distributing position mark of positive position, and will be described in each figure distributing position mark After mark graphic recording is first mark figure, further includes:

S204, in the first graphic parameter of confirmation and the focal position corresponding described first to be determined mark figure When being not best, using corresponding first compensation rate of optimal first graphic parameter as the new of the focal position to be determined The first compensation rate, and described in being redefined in other in addition to the focal position to be determined according to first correcting value Figure distributing position carries out the first new compensation rate of each mark figure of mark；The first new compensation rate refers to institute State the secondary coarse range between focusing eyeglass and the positioning zero point；The determination of the first new compensation rate, is described On the basis of first compensation rate, it is adjusted according to first correcting value.

S205 adjusts new first of the focusing eyeglass on second guide rail according to the first new compensation rate Position is corrected, and the first new correction position is associated with each figure distributing position；

S206, the figure distributing position mark corresponding with the first new correction position in the mark plane The mark figure, and be the new first mark figure by the mark graphic recording of each figure distributing position mark Shape.

In this embodiment, it is first to illustrate that the distance between focusing eyeglass and the positioning zero point to laser marking device carries out After secondary coarse adjustment, if confirmation with the focal position corresponding described first to be determined mark figure the first graphic parameter simultaneously It is not best, it is necessary to secondary coarse adjustment is carried out, to obtain the mark figure of new first, it will be appreciated that ground, if secondary coarse adjustment completes it Afterwards, it still can not confirm the first graphic parameter of the corresponding with the focal position to be determined described new first mark figure To be best, need to carry out coarse adjustment three times at this time, and so on, until after certain coarse adjustment completion, confirmation and last time First graphic parameter of the mark figure of the focal position to be determined of coarse adjustment corresponding newest first be it is best, at this time can be straight Connect the fine-tuning process for entering step S30.

Further, described according to preset second correcting value as shown in figure 4, in the step S30, to laser marking The distance between the focusing eyeglass of equipment and positioning zero point carry out fine tuning, and obtain after fine tuning with each figure distributing position Corresponding second mark figure, comprising:

S301, using corresponding first compensation rate of optimal first graphic parameter as in the focus to be determined Position carries out the second compensation rate of the mark figure of mark, and according to preset second correcting value determine except described to true Other described figure distributing positions except focus position carry out the second compensation rate of each mark figure of mark；It is described Second compensation rate refers to the fine tuning distance for the first time between the focusing eyeglass and the positioning zero point；Second compensation rate is really It is fixed, it is to be adjusted on the basis of first compensation rate or above-mentioned the first compensation rate newly according to second correcting value. In this embodiment, only in each figure distributing position corresponding described first mark figure, confirmation with it is described It, just can will be optimal described after first graphic parameter of focal position corresponding described first to be determined mark figure is best Corresponding first compensation rate of first graphic parameter (that is, confirm in step S20 with the first graphic parameter it is optimal to Determine corresponding first compensation rate in focal position) as the mark figure for carrying out mark in the focal position to be determined Second compensation rate.If the first graphic parameter with the focal position corresponding described first to be determined mark figure is not most It is good, then it also needs to continue coarse adjustment referring to step S204 to S206.

S302 adjusts second correction bit of the focusing eyeglass on second guide rail according to second compensation rate It sets, and the second correction position is associated with each figure distributing position；

S303, in the mark plane described in the figure distributing position mark corresponding with the second correction position Mark figure, and be the second mark figure by the mark graphic recording of each figure distributing position mark.

In this embodiment, it is first to illustrate that the distance between focusing eyeglass and the positioning zero point to laser marking device carries out The process of secondary fine tuning, if can confirm and each figure distributing position corresponding each described second after fine tuning for the first time is completed The difference between the second graph parameter of mark figure is respectively less than preset difference value threshold value, and with the focal position pair to be determined The second graph parameter of described second answered mark figure is best, can be directly entered in step S40 at this time directly determine with Corresponding second compensation rate in the focal position to be determined is focus compensation rate.

Further, as shown in figure 5, after the step S303, namely in the mark plane with second school Mark figure described in the corresponding figure distributing position mark of positive position, and will be described in each figure distributing position mark After mark graphic recording is second mark figure, further includes:

S304, confirm at least one with each figure distributing position corresponding each described second the of mark figure Difference between two graphic parameters is greater than or equal to preset difference value threshold value, or corresponding with the focal position to be determined described the When the second graph parameter of two mark figures is not best, by corresponding second compensation rate of the optimal second graph parameter As the second new compensation rate of the focal position to be determined, and according to second correcting value redefine except it is described to Determine that other described figure distributing positions except focal position carry out the second new compensation of each mark figure of mark Amount；The second new compensation rate refers to the secondary fine tuning distance between the focusing eyeglass and the positioning zero point；It is described new The second compensation rate determination, be to be adjusted on the basis of second compensation rate according to second correcting value.

S305 adjusts new second of the focusing eyeglass on second guide rail according to the second new compensation rate Position is corrected, and the second new correction position is associated with each figure distributing position；

S306, the figure distributing position mark corresponding with the second new correction position in the mark plane The mark figure, and be the new second mark figure by the mark graphic recording of each figure distributing position mark Shape.

In this embodiment, it is first to illustrate that the distance between focusing eyeglass and the positioning zero point to laser marking device carries out After secondary fine tuning, if confirm at least one with each figure distributing position corresponding each described second the second of mark figure Difference between graphic parameter is greater than or equal to preset difference value threshold value, or with the focal position corresponding described second to be determined The second graph parameter of mark figure is not best (two above condition must simultaneously meet), it is necessary to secondary fine tuning is carried out, To obtain the mark figure of new second, it will be appreciated that ground, if still can not confirm and each figure after secondary fine tuning is completed Difference of the distributing position corresponding each new second between the second graph parameter of mark figure is respectively less than preset difference value threshold Value, and the second graph parameter of the corresponding with the focal position to be determined new second mark figure is best, needs at this time Fine tuning three times is carried out, and so on, until confirming corresponding with each figure distributing position after certain fine tuning completion Each newest second difference between the second graph parameter of mark figure is respectively less than preset difference value threshold value, and with it is described to It determines that the second graph parameter of the mark figure of focal position corresponding newest second is best, step can be directly entered at this time It is focus compensation rate that second compensation rate corresponding with the focal position to be determined is directly determined in S40.

To be best understood from the present invention, following instance is enumerated to illustrate the focus adjustment method of laser marking device of the invention:

D1, setting one can be used for accurately facilitating (namely the mark being easier to after identification mark of comparison focal length variations Whether the graphic parameter of figure best) mark figure, in this example, as shown in fig. 6, setting mark figure by four diameters The roundlet of 0.5mm is constituted, and the adjacent circle center distance of four roundlets can be adjusted according to demand, in this example, setting The adjacent circle center distance of four roundlets is set as 2mm.Understandably, mark figure can be set as any other according to demand Hold other figures or document that laser marking device carries out mark；For example, roundlet can be set as one or more, and roundlet Diameter be also not limited to 0.5mm, shape is also not limited to circle.

The corresponding figure distributing position of 1 mark figure of table and correction parameter

D2, drawing the mark figure of above-mentioned setting in the software interface of laser marking device, (four of diameter 0.5mm are small Circle, and the distance of center circle of each roundlet is 2mm), referring to Fig. 7, corresponding nine figure distributing positions (the nine groups of marks of setting mark figure Figure) be 3*3 array, and setting vertical and horizontal array spacings is 5mm.Every group of mark figure respectively corresponds the position 1 in table 1 To position 9.Understandably, in the present invention, the figure distributing position of mark figure is not limited to 9 figures in this example point Cloth position, but can be one or more figure distributing positions, and figure distributing position may be set in the work of mark plane Any position at center or edge in region；In this example, setting position 5 be mark plane working region in need essence Really look for the focal position to be determined of focus.

D3, sets the first correcting value as 0.2mm, can be directly according to since the current compensation rate that sets in table 1 is 0 One correcting value, which is determined, carries out the first compensation rate of each mark figure of mark (that is, setting is to be determined in each figure distributing position First compensation rate of the corresponding position 5 in focal position is 0, and the first compensation rate of remaining position is determined as table according to the first correcting value Shown in 2), that is, the first compensation rate such as 2 compensation rate of table of position 1 to position 9 is adjusted according to the size of the first correcting value, into And adjusting first correction position of the focusing eyeglass on the second guide rail according to the first compensation rate, (focusing eyeglass is on the second guide rail The sum of theoretical distance between positioning zero point and each first compensation rate in table 2 are the first correction position) after, successively exist It is each first correction position difference nine positions of mark mark figure, and by the mark graphic recording of above-mentioned mark be with it is each First corrects corresponding (namely corresponding with the figure distributing position of position 1 to position 9) first in position mark figure. The above process is coarse tuning process (namely completing this correction) for the first time.

First compensation rate of 2 position 1 to position 9 of table

D4, if in each figure distributing position (position 1 to position 9) corresponding first mark figure, confirmation with to Determining that the first graphic parameter of the mark figure of focal position (position 5) corresponding first is not best, position 3 is best, It then needs corresponding first compensation rate in position 3 (optimal first graphic parameter corresponding first compensation rate) as position in table 3 Set 5 new the first compensation rate (the first new compensation rate of focal position to be determined)；And it is redefined according to the first correcting value The first new compensation rate of each mark figure of mark is carried out in other figure distributing positions in addition to focal position to be determined (position 1 to position 4, corresponding the first new compensation rate in position 6 to position 9 in table 3)；Later further according to above-mentioned the first new benefit New first correction position of the amount of the repaying adjustment focusing eyeglass on the second guide rail, and by the mark graphic recording of above-mentioned mark be with Each the first new correction position corresponding (namely corresponding with the figure distributing position of position 1 to position 9) it is new the One mark figure.The above process is secondary coarse tuning process (namely completing this correction).

The first new compensation rate of 3 position 1 to position 9 of table

D5, if after secondary coarse adjustment, confirm first newly corresponding with focal position to be determined mark figure the One graphic parameter be it is best (if above content can not be determined, repeat D4, carry out three times, four times ... n times coarse adjustment, until confirmation with After first graphic parameter of the mark figure of focal position to be determined corresponding new first is best, coarse tuning process is completed), this When, by corresponding first compensation rate of optimal first graphic parameter (the first new compensation rate -0.4mm of position 5 in table 3) conduct Focal position to be determined carry out mark mark figure the second compensation rate (corresponding second compensation rate in position 5 in table 4, And the corresponding parameter value of current compensation rate shown in table 1 will be changed to -0.4mm), and according to preset second correcting value (0.05mm), which is determined, carries out the of each mark figure of mark in other figure distributing positions in addition to focal position to be determined Two compensation rates (position 1 to position 4, corresponding second compensation rate in position 6 to position 9 in table 4)；Later further according to above-mentioned second Compensation rate adjustment focusing eyeglass on the second guide rail second correction position (focusing eyeglass on the second guide rail with positioning zero point it Between theoretical distance and the sum of each second compensation rate in table 4 be the second correction position), and by the mark figure of above-mentioned mark It is recorded as and each second correction position corresponding (namely corresponding with the figure distributing position of position 1 to position 9) the Two mark figures.The above process is fine-tuning process (namely completing this correction) for the first time.

Second compensation rate of 4 position 1 to position 9 of table

D6, if after confirmation fine tuning for the first time the corresponding with each figure distributing position each second mark figure second graph Difference between parameter is respectively less than preset difference value threshold value, and corresponding with focal position to be determined second mark figure second Graphic parameter is best, it is determined that second compensation rate corresponding with focal position to be determined is focus compensation rate (that is, at this time can be with Determine that the corresponding focus compensation rate in position 5 is -0.4mm).If confirm at least one corresponding with each figure distributing position each second The difference between the second graph parameter of mark figure be greater than or equal to preset difference value threshold value, or with focal position pair to be determined The second graph parameter of second answered mark figure is not best, at this point, carrying out referring to the secondary coarse tuning process in D4 secondary Fine tuning similarly if being still unable to satisfy fine tuning requirement, can carry out always fine tuning three times, four fine tuning ... n times fine tunings, until Difference of the confirmation corresponding with each figure distributing position newest second between the second graph parameter of mark figure is respectively less than Preset difference value threshold value, and the second graph parameter of the corresponding with focal position to be determined newest second mark figure is best When, fine-tuning process is completed, determines that newest second compensation rate corresponding with focal position to be determined is focus compensation rate.

D7 determines the focal position of focal position to be determined, the focus position of focal position to be determined according to focus compensation rate Set refer to actual range of the focusing eyeglass on the second guide rail between positioning zero point be equal to theoretical distance and focus compensation rate it The control device control focusing eyeglass of the position of sum, laser mark printing device is mobile according to actual range on the second guide rail Realize that mark season focal position to be determined is in focal position.

As shown in figure 8, the present invention also provides a kind of laser marking device, including control device, laser 1, dynamic are focused Device 2, focusing lens 3 and galvanometer 4, dynamic focus control 2 include focusing eyeglass 21 and slide company with the focusing eyeglass 21 The second guide rail 22 connect；After the laser beam that the laser 1 emits sequentially passes through the focusing eyeglass 21 and focusing lens 3, It is exposed to via the galvanometer 4 deflection and carries out mark in mark plane 6；The control device connects the dynamic focus control 2 With the laser 1, and the control device controls the focusing eyeglass 21 and moves on second guide rail 22, so that institute Focal position will be in by the focal position to be determined that laser beam carries out mark in mark plane 6 by stating；

The control device includes:

Laser marking device provided by the invention passes through between the focusing eyeglass to laser marking device and positioning zero point Distance successively carries out coarse adjustment and fine tuning, determines that the focus the distance between exchanged focus lens and position zero point and compensate compensates It measures, and then eyeglass of focusing is adjusted to the focal position of focal position to be determined according to the focus compensation rate.The present invention substantially mentions Risen the accuracy that laser marking device determines focus, air exercise mark on a map shape mark effect requirements it is higher or air exercise is marked on a map shape Line thickness require have stronger practicability in the application of thinner mark figure；And coarse adjustment and fine tuning of the invention etc. is burnt Point adjustment process intelligent can be run., namely by the control device of laser marking device, can control dynamic focus control Focusing eyeglass 21 in 2 slides on the second guide rail 22 according to the focus compensation rate, and without human intervention, degree of regulation will It can be significantly improved.Understandably, referred in background technique below for focal position (namely focal position to be determined) Height adjustment process, need to carry out before the focus adjustment method of laser marking device provided by the invention, in this way, making this Laser marking device it is applied widely, can for different-thickness mark material can conveniently be applicable in.And complete focus The height adjustment of position and after locking handwheel 7, even if focal position to be determined be not in focal position (namely with focus position Set that there are deviations), can also above-mentioned laser marking device through the invention focus adjustment method, will be adjusted according to the focus compensation rate Focus lens are adjusted to the focal position of focal position to be determined, in this way, can make in the height adjustment of focal position Handwheel, which adjusts the adverse effect that focus point accuracy generates, no longer to be existed, and operation of the present invention is easy, also improves the fortune of equipment Row stability.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims

1. a kind of focus adjustment method of laser marking device characterized by comprising

Determine at least one figure distributing position corresponding with mark figure in mark plane；Wherein, all figure distributions One of them described figure distributing position in position is focal position to be determined；

According to preset first correcting value, the distance between focusing eyeglass and positioning zero point to laser marking device carry out thick Adjust, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure；

With each figure distributing position corresponding described first mark figure, confirm and the focal position to be determined When first graphic parameter of the corresponding described first mark figure is best, according to preset second correcting value, to laser marking The distance between the focusing eyeglass of equipment and positioning zero point carry out fine tuning, and obtain after fine tuning with each figure distributing position Corresponding second mark figure；Second correcting value is less than first correcting value；

Confirmation between each figure distributing position corresponding each described second the second graph parameter of mark figure Difference is respectively less than preset difference value threshold value, and with the second figure of the focal position corresponding described second to be determined mark figure When shape parameter is best, confirmation second compensation rate corresponding with the focal position to be determined is focus compensation rate；The coke Point compensation rate refer to the focal position to be determined be focal position when, it is described focusing eyeglass and it is described positioning zero point between away from From；

2. the focus adjustment method of laser marking device as described in claim 1, which is characterized in that described according to preset first school Positive quantity carries out coarse adjustment to the distance between focusing eyeglass of laser marking device and positioning zero point, and obtain after coarse adjustment with it is each The figure distributing position corresponding first mark figure, comprising:

It is determined according to preset first correcting value and carries out the of each mark figure of mark in each figure distributing position One compensation rate；First compensation rate refer to the focusing eyeglass of laser marking device on the second guide rail being slidably connected with it with Position the coarse range for the first time between zero point；

Adjust first correction position of the focusing eyeglass on second guide rail according to first compensation rate, and by this One correction position is associated with each figure distributing position；

The mark figure described in the figure distributing position mark corresponding with the first correction position in the mark plane, It and by the mark graphic recording of each figure distributing position mark is the first mark figure.

3. the focus adjustment method of laser marking device as claimed in claim 2, which is characterized in that described in the mark plane Mark figure described in the figure distributing position mark corresponding with the first correction position, and each figure is distributed position After the mark graphic recording of mark is set as first mark figure, further includes:

It with the first graphic parameter of the focal position corresponding described first to be determined mark figure is not best in confirmation When, it is mended corresponding first compensation rate of optimal first graphic parameter as new first of the focal position to be determined The amount of repaying, and redefined according to first correcting value and be distributed in other described figures in addition to the focal position to be determined Position carries out the first new compensation rate of each mark figure of mark；The first new compensation rate refers to the focusing lens Secondary coarse range between piece and the positioning zero point；

New first correction position of the focusing eyeglass on second guide rail is adjusted according to the first new compensation rate, And the first new correction position is associated with each figure distributing position；

The mark described in the figure distributing position mark corresponding with the first new correction position in the mark plane Figure, and be the new first mark figure by the mark graphic recording of each figure distributing position mark.

4. the focus adjustment method of laser marking device as described in claim 1, which is characterized in that described according to preset second school Positive quantity carries out fine tuning to the distance between focusing eyeglass of laser marking device and positioning zero point, and obtain after fine tuning with it is each The figure distributing position corresponding second mark figure, comprising:

It is carried out using corresponding first compensation rate of optimal first graphic parameter as in the focal position to be determined Second compensation rate of the mark figure of mark, and determined according to preset second correcting value and removing the focus position to be determined Other described figure distributing positions except setting carry out the second compensation rate of each mark figure of mark；Second compensation Amount refers to the fine tuning distance for the first time between the focusing eyeglass and the positioning zero point；

Adjust second correction position of the focusing eyeglass on second guide rail according to second compensation rate, and by this Second revisal positive position is associated with each figure distributing position；

The mark figure described in the figure distributing position mark corresponding with the second correction position in the mark plane, It and by the mark graphic recording of each figure distributing position mark is the second mark figure.

5. the focus adjustment method of laser marking device as claimed in claim 4, which is characterized in that described in the mark plane Mark figure described in the figure distributing position mark corresponding with the second correction position, and each figure is distributed position After the mark graphic recording of mark is set as second mark figure, further includes:

Confirming at least one, the second graph of mark figure has been joined with each figure distributing position corresponding each described second Difference between number is greater than or equal to preset difference value threshold value, or described second mark corresponding with the focal position to be determined When the second graph parameter of figure is not best, using corresponding second compensation rate of the optimal second graph parameter as described in The second new compensation rate of focal position to be determined, and redefined according to second correcting value except the focus to be determined Other described figure distributing positions except position carry out the second new compensation rate of each mark figure of mark；It is described new The second compensation rate refer to it is described focusing eyeglass and it is described positioning zero point between secondary fine tuning distance；

New second correction position of the focusing eyeglass on second guide rail is adjusted according to the second new compensation rate, And the second new correction position is associated with each figure distributing position；

The mark described in the figure distributing position mark corresponding with the second new correction position in the mark plane Figure, and be the new second mark figure by the mark graphic recording of each figure distributing position mark.

6. the focus adjustment method of laser marking device as described in claim 1, which is characterized in that described to be compensated according to the focus The focusing eyeglass is adjusted to the focal position of the focal position to be determined by amount, comprising:

Control the focusing eyeglass and be moved to the focal position of the focal position to be determined on second guide rail, it is described to Determine that the focal position of focal position refers to reality of the focusing eyeglass on second guide rail between the positioning zero point Border distance is equal to the position of the sum of theoretical distance and described focus compensation rate.

7. the focus adjustment method of laser marking device as described in claim 1, which is characterized in that first graphic parameter includes First the line weight of mark figure, calcination area and has burnt one of side size or a variety of；The second graph parameter packet It includes second and the line weight of mark figure, calcination area and has burnt one of side size or a variety of.

8. the focus adjustment method of laser marking device as claimed in claim 7, which is characterized in that the described first mark figure First graphic parameter is best, comprising:

The lines of described first mark figure are most thin；Or/and described first mark figure calcination area it is minimum；Or/and The burning side of described first mark figure is minimum；

The second graph parameter of described second mark figure is best, comprising:

The lines of described second mark figure are most thin；Or/and described second mark figure calcination area it is minimum；Or/and The burning side of described second mark figure is minimum.

9. the focus adjustment method of laser marking device as described in claim 1, which is characterized in that first correcting value is 0.2 Millimeter, second correcting value are 0.05 millimeter.

10. a kind of laser marking device, which is characterized in that including control device, laser, dynamic focus control, focusing lens And galvanometer, the dynamic focus control include focus eyeglass and with second guide rail that is slidably connected of focusing eyeglass；It is described After the laser beam of laser transmitting sequentially passes through the focusing eyeglass and focusing lens, exposes to and beat via galvanometer deflection Mark is carried out in mark plane；The control device connects the dynamic focus control and the laser, and the control device It controls the focusing eyeglass to move on second guide rail, so that will be beaten by laser beam in the mark plane Target focal position to be determined is in focal position；

The control device includes:

Determining module determines at least one figure distributing position corresponding with mark figure in mark plane；Wherein, all described One of them described figure distributing position in figure distributing position is focal position to be determined；

Coarse adjustment module is used between the focusing eyeglass according to preset first correcting value, to laser marking device and positioning zero point Distance carry out coarse adjustment, and obtain after coarse adjustment with each figure distributing position corresponding first mark figure；

Fine tuning module, for in each figure distributing position corresponding described first mark figure, confirmation with it is described When first graphic parameter of focal position corresponding described first to be determined mark figure is best, according to preset second correction Amount carries out fine tuning to the distance between focusing eyeglass of laser marking device and positioning zero point, and obtain after fine tuning with each institute State the mark figure of figure distributing position corresponding second；Second correcting value is less than first correcting value；

Compensate determining module, for confirmation and each figure distributing position corresponding each described second mark figure the Difference between two graphic parameters is respectively less than preset difference value threshold value, and with the focal position corresponding described second to be determined When the second graph parameter of mark figure is best, confirmation second compensation rate corresponding with the focal position to be determined is burnt Point compensation rate；The focus compensation rate refer to the focal position to be determined be focal position when, the focusing eyeglass with it is described Position the distance between zero point；

Adjustment module, for the focusing eyeglass to be adjusted to the coke of the focal position to be determined according to the focus compensation rate Point position.