KR101972075B1 - Laser irradiation unit, and laser marking apparatus - Google Patents

Abstract

The present invention relates to a laser irradiation unit and a laser engraving apparatus and, more specifically, to a laser irradiation unit and a laser engraving apparatus including the same, wherein the laser irradiation unit can vary an area of a beam while constantly maintaining a focal length. Moreover, the laser irradiation unit comprises: a light receiving unit disposed at a front end and connected to predetermined cables to receive beams supplied from external light sources; a nozzle unit disposed at a rear end and irradiating the beams to the outside; an optical module arranged between the light receiving unit and a laser nozzle and including a plurality of lenses; and a unit housing in which the optical module is included.

Description

LASER IRRADIATION UNIT, AND LASER MARKING APPARATUS}

The present invention relates to a laser irradiation unit and a laser engraving device, and more particularly, is disposed at the front end and connected to a predetermined cable, the light receiving unit receiving the beam supplied from an external light source, the rear end is arranged to irradiate the beam to the outside An optical module is provided between the nozzle unit, the light receiving unit, and the laser nozzle, and includes a plurality of lenses, and a unit housing in which the optical module is built, and can change the area of the beam while maintaining the same focal length. The present invention provides a laser engraving device including a laser irradiation unit and a laser irradiation unit.

A predetermined vehicle identification number (VIN) is imprinted on the vehicle body. The chassis number is imprinted for the production management and the history management of the product, and is composed of alphabets and numbers representing the country of origin, the manufacturer, and the vehicle model.

For the marking of such a chassis number, a laser engraving device using a pulse laser is used. As shown in FIG. 1, the conventional laser marking device receives a laser beam generated by a predetermined pulse laser generator P and performs a marking process on a target T through a predetermined nozzle. And a multi-joint manipulator (R) device for moving the laser irradiation unit Q to cause a character to be engraved.

According to the prior art, when performing the stamping using the laser engraving device, when the size of the laser beam is to be changed, the focal length of the laser beam is not kept constant, there is a problem that operation control is difficult. This is because optically, the focal length of the beam and the size of the beam are influenced by each other.

In addition, a problem is caused that various devices in the laser engraving device are contaminated or damaged by a spatter made of various fine particles generated during the marking process. In particular, a nozzle for irradiating a laser beam to a marking object or a distance sensor for measuring the distance between the marking object and the nozzle is easily contaminated, resulting in abnormal marking or an increase in operating costs.

In addition, it is difficult to confirm whether or not the laser beam has a normal output, causing a problem that the stamping is abnormal.

Patent Registration 10-1709566

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a laser engraving apparatus including a laser irradiation unit and a laser irradiation unit capable of varying an area of a beam while maintaining the same focal length.

It is still another object of the present invention to provide a laser engraving apparatus including a laser irradiation unit and a laser irradiation unit in which various devices in the laser marking apparatus are prevented from being contaminated or damaged by a spatter generated during the marking process. There is.

Another object of the present invention is to provide a laser engraving device including a laser irradiation unit and a laser irradiation unit which can conveniently check the output of the laser beam.

In order to achieve the above object, the laser irradiation unit according to the present invention is a laser irradiation unit used in the laser engraving device, disposed in the front end and connected to a predetermined cable, the light receiving portion, the rear end is received by the beam supplied from an external light source A nozzle unit disposed to be disposed to irradiate a beam to the outside, an optical module provided between the light receiving unit and the laser nozzle and including a plurality of lenses, and a unit housing in which the optical module is embedded,

The optical module is configured to be able to vary the beam size at the focal length position while keeping the focal length of the laser beam irradiated through the nozzle portion constant.

Preferably, the optical module includes a front lens unit disposed adjacent to the light receiving unit, a rear lens unit disposed behind the front lens unit, and a variable lens unit disposed between the front lens unit and the rear lens unit. And the variable lens unit is configured to vary an area of a beam incident to the rear lens unit.

Preferably, the optical module includes a first lens unit for generating parallel light, a second lens unit arranged behind the first lens and having a predetermined focal length, and collecting a beam, behind the second lens unit. A variable lens unit arranged behind, a third lens unit arranged behind the variable lens unit to generate parallel light, and a fourth lens unit arranged behind the third lens unit and condensing the beam with a predetermined focal length The variable lens unit may vary an area of a beam incident to the third lens unit.

Preferably, the variable lens unit includes a lens that is positionally movable between the second lens unit and the third lens unit, and the distance between the second lens unit and the variable lens unit and the variable lens unit; The distance between the third lens units is variable.

Preferably, the nozzle portion is made of Teflon material, is configured to be removable.

Preferably, the inspection unit further comprises an inspection unit, the inspection unit is disposed on the beam path passing through the optical module disposed in the unit housing, the mirror having a predetermined transmittance and reflectance, and the beam reflected from the mirror And a power sensor that captures and reads the intensity of the beam.

Preferably, the inspection unit includes a mounting portion provided in the unit housing and on which the mirror is mounted.

Laser engraving device according to an embodiment of the present invention, the laser irradiation unit; An outer cover on which the laser irradiation unit is mounted; And a distance measuring device, wherein the distance measuring device includes a distance measuring sensor disposed under the outer cover to measure a distance between an imprinted object and a laser irradiation unit, and protecting the distance measuring sensor with a light transmissive material. A protective window configured, and a protective cover openable to selectively cover a lower portion of the protective window.

Preferably, the apparatus further comprises an air curtain device, wherein the air curtain device includes a nozzle body for injecting air in a direction in which the nozzle part is located, and a connection part for changing the position of the nozzle body.

According to the present invention, a laser engraving device including a laser irradiation unit and a laser irradiation unit capable of varying the area of the beam while keeping the focal length the same can be provided. In particular, by optimally configuring the lens unit in the laser irradiation unit, it is possible to change the area of the beam while maintaining the same focal length while maintaining uniformity of the beam at the focus.

In addition, according to the present invention, a laser engraving apparatus including a laser irradiation unit and a laser irradiation unit in which various devices in the laser marking apparatus are prevented from being contaminated or damaged by a spatter generated during the marking process can be provided. have.

In addition, according to the present invention, a laser engraving apparatus including a laser irradiation unit and a laser irradiation unit capable of conveniently checking the output of a laser beam may be provided.

1 is a view showing an example of a laser engraving device according to the prior art.
2 is a view showing the overall shape of the laser engraving device according to the present invention.
3 is a view showing the internal structure of the laser engraving device according to the present invention.
4 is a view showing a laser irradiation unit according to the present invention.
5 is a view showing the structure of an optical module of a laser irradiation unit according to an embodiment of the present invention.
6 and 7 are views showing the operation of the optical module according to an embodiment of the present invention.
8 shows the relationship between the area of the beam incident on the lens and the focal length of the beam passing through the lens.
9 to 12 are diagrams showing the area of the beam and the intensity distribution of the beam at the same focal length.
13 and 14 are views showing the structure of the inspection unit of the laser irradiation unit according to an embodiment of the present invention.
15 and 16 are views showing the structure of the distance measuring device of the laser engraving device according to an embodiment of the present invention.
17 is a view showing the structure of an air curtain device.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. This example is illustrative and does not limit the invention in any way.

2 is a view showing the overall shape of the laser engraving device 20 according to the present invention, Figure 3 is a view showing the internal structure of the laser marking device 20 according to the present invention, Figure 4 is a laser according to the present invention It is a figure which showed the irradiation unit 10. FIG.

First, the laser engraving device 20 including the laser irradiation unit 10 according to the present invention will be described.

The laser engraving device 20 according to the present invention, the laser irradiation unit 10; The laser irradiation unit 10 includes an outer cover 22 mounted therein. In addition, the distance measuring device 300 and the air curtain device 400 may be included. In this case, the distance measuring device 300 is disposed below the outer cover to protect the distance measuring sensor 310 and the distance measuring sensor 310 to measure the distance between the imprinted object and the laser irradiation unit 10. A protective window 320; And a protective cover 330 openable to selectively cover a lower portion of the protective window 320.

The laser irradiation unit 10 is mounted in the outer cover 22. The outer cover 22 constitutes an outer appearance of the laser engraving device 20. The laser irradiation unit 10 may be mounted inside the outer cover 22. The outer cover 22 may be provided with a predetermined actuator capable of moving the laser irradiation unit 10 in position. In addition, the outer cover 22 may be connected to and displaced with a predetermined articulated manipulator 30. The outer cover 22 is made of SUS material to have a spatter resistance, and may have a Teflon coating.

The distance measuring device 300 and the air curtain device 400 will be described in detail below.

Hereinafter, the laser irradiation unit 10 which concerns on this invention is demonstrated.

The laser irradiation unit 10 according to the present invention is a laser irradiation unit 10 used in the laser engraving device 20, and includes a light receiving unit 12, a nozzle unit 14, an optical module 100, and a unit housing ( 16) can be configured to include. In addition, preferably, the inspection unit 200 may further include.

The light receiving portion 12 is disposed at the front end of the laser irradiation unit 10. The light receiving unit 12 is a member that can be provided to the optical module 100 to be described later by connecting the external light source, the beam generated from the outside. For example, the light receiver 12 may be a cable connection member to which a predetermined optical cable L may be connected.

The nozzle part 14 is a member which is arrange | positioned at the rear end of the laser irradiation unit 10, and can irradiate the marking object to the beam which passed the optical module 100. FIG. The nozzle unit 14 is not necessarily configured separately from the optical module 100 and may have a configuration combined with a portion of the optical module 100.

Preferably, the nozzle unit 14 is made of Teflon material having heat resistance, corrosion resistance, and friction resistance, and may have a detachable configuration. Therefore, it may have spatter resistance.

The optical module 100 is disposed between the light receiving unit 12 and the nozzle unit 14, and is an apparatus including a plurality of lenses. The optical module 100 is embedded in the unit housing 16 constituting the appearance of the laser irradiation unit 10.

The optical module 100 is provided between the light receiving unit 12 and the laser nozzle and includes a plurality of lenses. The optical module 100 is configured to maintain a constant focal length of the laser beam irradiated through the nozzle unit 14 and to vary the beam size at the focal length position.

The unit housing 16 constitutes an exterior of the laser irradiation unit 10, and is configured such that the optical module 100 may be embedded therein. The light receiving part 12 is provided at the front end of the unit housing 16, and the nozzle part 14 is provided at the rear end thereof. As described above, a predetermined optical cable may be connected to the light receiving unit 12, and the nozzle unit 14 may be detachable from the unit housing 16 and have a replaceable configuration.

Hereinafter, the optical module 100 will be described in more detail.

5 is a view showing the structure of the optical module 100 of the laser irradiation unit 10 according to an embodiment of the present invention, Figures 6 and 7 is the operation of the optical module 100 according to an embodiment of the present invention Is a diagram illustrating. 8 shows the relationship between the area of the beam incident on the lens and the focal length of the beam passing through the lens.

As shown in the figure, the optical module 100 includes a plurality of lenses, and the lenses may be disposed in the unit housing 16 described above.

For example, largely classified, the optical module 100 includes a front lens unit A, a rear lens unit B, and a variable lens unit disposed between the front lens unit A and the rear lens unit B ( C) can be configured to include.

The beam transmitted through the light receiving unit 12 passes through the front lens unit A, the variable lens unit C, and the rear lens unit B, and is irradiated to the imprinted object through the nozzle unit 14.

The front lens unit A causes the beam to be focused with a predetermined focal length.

The variable lens unit C enlarges the area of the beam passing through the front lens unit A and transmits it to the rear lens unit B. In this case, the area of the beam transmitted to the rear lens unit B may vary according to the operation of the variable lens unit C. FIG.

The rear lens unit B causes the beam transmitted through the variable lens unit C to be irradiated to the imprinted object with a predetermined focal length. At this time, as the area of the beam transmitted to the rear lens unit B by the variable lens unit C is variable, the beam irradiated to the imprinted object through the rear lens unit B is irradiated while maintaining the focal length at the same time. The area can vary.

A specific embodiment of the optical module 100 will be described below.

The optical module 100 may include a first lens unit 110, a second lens unit 120, a third lens unit 140, a fourth lens unit 150, and a variable lens unit C. Can be. In this case, the first lens unit 110 and the second lens unit 120 constitute the front lens unit A, and the third lens unit 140 and the fourth lens unit 150 are the rear lens unit ( B) can be configured.

The first lens unit 110 may be disposed in front of the optical module 100, and may modulate a laser provided through the light receiving unit 12 to be parallel light. For example, the first lens unit 110 may include two lenses overlapped in the beam path direction, and may include a first lens 112 and a second lens 114.

The second lens unit 120 is disposed at the rear of the first lens unit 110, and modulates the parallel light modulated by the first lens unit 110 to condense with a predetermined focal length. For example, the second lens unit 120 may include two lenses overlapped in the beam path direction, and may include a third lens 122 and a fourth lens 124.

The variable lens unit C is disposed behind the second lens unit 120, and enlarges a beam passing through the second lens unit 120 so that the beam has a predetermined area and the third lens unit 140. To be delivered. For example, the variable lens unit may include the fifth lens 130 and a predetermined actuator (not shown).

The third lens unit 140 may be disposed behind the variable lens unit C, and may modulate a beam passing through the variable lens to be parallel light again. For example, the third lens unit 140 may include two lenses overlapped in the beam path direction, and may include a sixth lens 142 and a seventh lens 144.

The fourth lens unit 150 passes through the third lens unit 140 to focus the beam modulated into parallel light at a predetermined focal length. The fourth lens unit 150 may include an eighth lens 150. One lens constituting the fourth lens unit 150 may be one. Therefore, the fourth lens unit 150 and the eighth lens 150 are denoted by the same reference numerals in the present specification. However, this is not necessarily the case.

Hereinafter, specific embodiments and operations of the variable lens unit C will be described.

The variable lens unit C is disposed between the second lens unit 120 and the third lens unit 140 to vary the area of the beam transmitted to the third lens unit 140. When the area of the beam transmitted to the third lens unit 140 is enlarged, the area of the beam irradiated to the imprinted object through the nozzle unit 14 is reduced. On the contrary, when the area of the beam transmitted to the third lens unit 140 is reduced, the area of the beam irradiated to the imprinting object through the nozzle unit 14 is enlarged. However, although the area of the beam irradiated to the imprinting object is varied in this way, the focal length of the beam irradiated to the imprinted object through the nozzle unit 14 is kept the same.

This principle is explained through the formulas and examples. FIG. 8 illustrates the relationship between the beam incident on the lens and the area at the focal length of the beam passing through the lens, and Equation 1 below summarizes the relational expression shown in FIG. 8.

<Equation 1>

In Equation 1, W is the size of the beam (area, diameter, etc.) input to the lens, W ₀ is the size of the beam at the focal length. That is, the focal spot size at the focus is inversely proportional to the beam size input to the lens. Therefore, the present invention has a variable lens unit (C), and by varying the size of the beam input to the rear lens unit (B), as a result of varying the size of the beam irradiated to the imprinted object through the nozzle unit 14 will be.

In example embodiments, the fifth lens 130 constituting the variable lens unit C may be moved between the second lens unit 120 and the third lens unit 140. In this case, the actuator provided in the variable lens unit C may move the fifth lens 130. Therefore, the distance between the second lens unit 120 and the fifth lens 130 and the distance between the fifth lens 130 and the third lens unit 140 may vary.

For example, as shown in FIG. 6, when the fifth lens 130 is positioned at the first position P1 proximate the second lens unit 120, the second lens unit 120 and the fifth lens 130 are disposed between the second lens unit 120 and the fifth lens 130. The distance of M becomes smaller and becomes M1, and the distance between the fifth lens 130 and the third lens unit 140 becomes larger and becomes N1. In this case, the area of the beam irradiated to the object to be imprinted through the nozzle unit 14 is enlarged to have a predetermined first area.

On the contrary, as shown in FIG. 7, when the fifth lens 130 is positioned at the second position P2 proximate to the third lens unit 140, the second lens unit 120 and the fifth lens 130 are disposed between each other. The distance is increased to M2, and the distance between the fifth lens 130 and the third lens unit 140 becomes smaller to become N2. In this case, the area of the beam irradiated to the object to be imprinted through the nozzle unit 14 is reduced to have a predetermined second area.

Hereinafter, an embodiment of the present invention will be described.

In the above embodiment, the specifications of the first to eighth lenses 150 constituting each lens unit are configured as follows. Table 1 below shows an example of the specifications of each lens constituting the lens unit, it may be an embodiment of the present invention. However, it is not necessarily limited thereto.

Lens number Curvature (mm) Conic Constant material Distance (mm) Thickness (mm) First lens 112 INF
-23 ~ -26
-2.4261 BK7 20.0-24.0 3.5 to 5.0 Second lens 114 23-26
INF -2.4261
BK7 1.5 ~ 3.0 3.5 to 5.0 Third lens 122 -65 ~ 80
-145 ~ -165
BK7 35.0-40 3.5 to 5.0 Fourth Lens 124 265-285
-45 ~ 60
BK7 0.5-2.0 2.0 ~ 5.0 Fifth Lens 130 -20 ~ -25
INF
BK7 20 ~ 23 (POS1), 48 ~ 55 (POS2) 1.5 ~ 3.0 Sixth lens 142 45-65
30-40
EFEL1 105 ~ 120 (POS1), 65 ~ 85 (POS2) 2.5 ~ 5.0 Seventh lens 144 70-80
-140 ~ -150
FD2 2.5 ~ 4.5 4.0-6.0 Eighth lens 150 25-35
INF
BK7 18.0 ~ 23.0 6.0-12.0 FOCUS 44.0-60.0

Referring to Table 1 above, it is as follows.

The curvature is the curvature of each lens, the upper value being the curvature of the front surface (the direction in which the light receiving portion 12 is located), and the lower value being the curvature of the rear surface (the direction in which the nozzle portion 14 is located). INF means infinity and thus means that it consists of planes.

The conic constant is a constant representing an aspherical surface, and is a predetermined constant used in an aspherical equation. In addition, the term which shows each material is a conventional term regarding a predetermined glass material. The conic constant and the material are well known concepts, and thus descriptions thereof are omitted.

The distance is a distance between the front member and the lens, and in the case of the first lens 112, the distance between the rear end of the light receiving unit 12 (or the rear end of the fiber cable) and the first lens 112. In addition, the distance of the FOCUS means the distance between the eighth lens 150 and the focus position. In addition, since the position of the fifth lens 130 is variable, the distance marked on the fifth lens 130 and the distance marked on the sixth lens 142 may vary. POS 1 is a case where the fifth lens 130 is positioned at the first position P1 as shown in FIG. 6, and POS 2 is a case where the fifth lens 130 is positioned at the second position P2 as illustrated in FIG. 7.

Here, the distance between each lens is the distance between each surface of the lens. The reference point of the distance between the planes is the vertex of each plane (the point where the lens curvature and the optical axis (center line) meet). That is, in the present invention, the distance between lenses means the distance between the vertices and the vertices of the lens, which is usually optically understood.

The thickness of the lens is the thickness of the central portion of the lens.

Table 2 below shows the specifications of the lens according to an experimental example of the present invention.

Lens number Curvature (mm) Conic Constant material Distance (mm) Thickness (mm) First lens 112 INF
-24.9
-2.4261 BK7 21.616 4.3 Second lens 114 24.9
INF -2.4261
BK7 2.0 4.3 Third lens 122 -70.41
-156.907
BK7 40.0 4.0 Fourth Lens 124 272.798
-52.498
BK7 1.0 4.0 Fifth Lens 130 -22.841
INF
BK7 21.011 (POS1), 52.886 (POS2) 2.0 Sixth lens 142 55.628
35.076
EFEL1 107.351 (POS1), 75.476 (POS2) 4.0 Seventh lens 144 76.042
-144.726
FD2 3.709 5.0 Eighth lens 150 29.441
INF
BK7 20.097 8.0 FOCUS 45.897

9 to 12 are diagrams showing the area of the irradiated beam and the intensity distribution in the experimental example as shown in Table 2 above. 9 and 10 show the area of the beam and the intensity distribution of the beam when the spot size of the beam irradiated through the nozzle unit 14 at one focal length is 0.6 mm, and FIGS. 11 and 12 are FIGS. The area and intensity distribution of the beam when the inner diameter of the beam irradiated through the nozzle unit 14 at the same focal length as 9 and 10 is 1.2 mm. Looking at both, it can be seen that the inner diameter of the beam is changed, but the intensity distribution of the beam is kept uniform and the focal length is kept the same.

In general, when varying the size of the beam through the lens, it is accompanied by a large number of aberrations, the uniformity of the beam at the focus can be reduced. In the present invention, since the optical module 100 has the same optical system structure as the embodiment, the beam size can be varied while maintaining the same focal length. At the same time, the uniformity of the beam can also be maintained depending on the configuration of the lens.

13 and 14 are views showing the structure of the inspection unit 200 of the laser irradiation unit 10 according to an embodiment of the present invention.

The inspection unit 200 may include a mirror 210 and a power sensor 220, and the mirror 210 and the power sensor 220 may be mounted in the unit housing 16 by a predetermined mounting unit 230.

The mirror 210 may be disposed in the unit housing 16 and disposed on a path of a beam passing through the optical module 100, and may have a predetermined transmittance and a reflectance. For example, as shown in FIG. 14, the mirror 210 may be disposed between the first lens unit 110 and the second lens unit 120.

The mirror 210 may reflect at least a portion of the beam passing through the optical module 100 in a predetermined direction to be incident to the power sensor 220 described later. According to one example, the mirror 210 has a configuration that transmits 99.5% of the beam and reflects 0.5%, so that most of the incident beam can be transmitted.

The power sensor 220 is a predetermined sensor that captures the beam reflected by the mirror 210 and reads the intensity of the beam. The power sensor 220 may check whether the laser irradiation unit 10 operates normally by capturing the intensity of the reflected beam. For example, if the intensity of the captured beam is outside a certain range, it may be recognized as abnormal operation, and may generate an alarm or stop operation.

The mounting unit 230 is provided to mount the mirror 210 and the power sensor 220 on the laser irradiation unit 10. The mounting unit 230 may constitute a part of the unit housing 16 of the laser irradiation unit 10. The mounting unit 230 has a mounting space opened and closed by a predetermined cover 234, and the mounting space has a predetermined mounting opening 232 to accommodate the mirror 210. The mirror 210 mounted in the mounting hole 232 is disposed to be inclined at a predetermined angle with respect to the beam path. In addition, the power sensor 220 is connected to one side of the mounting unit 230 so that the beam reflected by the mirror 210 may be incident into the power sensor 220.

15 and 16 are views showing the structure of the distance measuring device 300 of the laser engraving device 20 according to an embodiment of the present invention.

The distance measuring device 300 may measure the distance between the stamping object and the laser irradiation unit 10 so that the marking process may be performed in a state where the marking object and the laser irradiation unit 10 are positioned at the correct distances. The distance measuring device 300 fires a predetermined distance capturing beam on the imprinted object, and then captures the distance capturing beam K reflected from the imprinted object to capture the distance of the imprinted object 310. ), A protective window 320 and a protective cover 330 positioned on a path of the distance capturing beam.

In this case, two distance measuring sensors 310 may be provided, and the two distance measuring sensors 310A and 310B may measure the inclination of the imprinted object, correct the inclined angle, and proceed with marking. In addition, the protective window 320 has a removable configuration, and can be replaced in case of contamination. Therefore, it is possible to prevent the occurrence of a sensor error due to contamination of the protective window 320 during long-term use.

The protective cover 330 may be disposed under the distance measuring device 300 and may selectively cover the protective window 320 at the bottom. For example, the protective cover 330 may include a predetermined pneumatic cylinder 334 and a sliding cover 332 such that the sliding cover 332 is slidably displaced by the pneumatic cylinder 334. For example, when the stamping process is performed, the pneumatic cylinder 334 is operated so that the sliding cover 332 of the protective cover 330 is spaced apart from the protective window 320 when measuring the distance, and the stamping is performed after the distance measurement is completed. When performing, the pneumatic cylinder 334 may be operated in reverse to perform the operation in which the sliding cover 332 covers the protective window 320.

As the protective cover 330 is provided, the protective window 320 is protected from contamination, and the replacement cycle of the protective window 320 may be long.

17 shows the air curtain device 400.

The air curtain device 400 may be disposed at the lower end of the outer cover 22 and may generate an air curtain to prevent the spatter from bouncing upward.

The air curtain device 400 may include a nozzle body 410, a connection part 420, and a rotating part 430. The nozzle body 410 includes an air nozzle 412 capable of injecting air in a predetermined curtain form. In addition, a plurality of positioning holes 414 may be formed on an upper surface of the nozzle body 410. The nozzle body 410 may spray air in the direction in which the nozzle unit 14 is located.

The connection part 420 may be connected to the nozzle body 410, and may be selectively connected to the plurality of positioning holes 414 to change the connection position of the nozzle body 410. The connection part 420 may be formed with a connection hole 422 connected to the positioning hole 414 through a predetermined connection means.

The rotating part 430 has an upper portion connected to the outer cover 22 and has a predetermined rotating connecting groove 432 so that the connecting portion 420 is rotatably connected. Therefore, the nozzle body 410 is configured to be rotatable, so that the nozzle body 410 is rotated and moved in accordance with use.

By being provided with the air curtain device 400, it is possible to prevent the spatter from being contaminated to contaminate the laser irradiation unit 10 and the distance measuring device 300.

According to the present invention, a laser engraving device 20 including a laser irradiation unit 10 and a laser irradiation unit 10 capable of varying the area of a beam while keeping the focal length the same may be provided. In particular, by optimally configuring the optical module 100 in the laser irradiation unit 10, it is possible to vary the area of the beam while maintaining the same focal length while keeping the uniformity of the beam at the focus. .

Further, according to the present invention, the laser irradiation unit 10 and the laser irradiation unit 10 in which various devices in the laser marking device 20 are prevented from being contaminated or damaged by the spatter generated during the stamping process. Laser engraving device 20 including a may be provided.

In addition, according to the present invention, the laser marking device 20 including the laser irradiation unit 10 and the laser irradiation unit 10 which can conveniently check the output of the laser beam can be provided.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

10: laser irradiation unit
12: light receiver
14: nozzle part
16: unit housing
20: laser stamping device
30: manipulator
100: optical module
110: first lens unit
112: first lens
114: second lens
120: second lens unit
122: third lens
124: fourth lens
130: fifth lens
140: third lens unit
142: sixth lens
144: seventh lens
150: fourth lens unit, eighth lens
200: inspection unit
210: mirror
220: power sensor
230: mounting portion
232: mounting hole
234: cover
300: distance measuring device
310: distance measuring sensor
320: protection window
330: protective cover
332: sliding cover
334 pneumatic cylinder
400: air curtain device
410: nozzle body
412: air nozzle
414: positioning hole
420: connection
420: connection hole
430: rotating part
432: pivot connection groove

Claims (9)

Laser irradiation unit;
An outer cover on which the laser irradiation unit is mounted; And
Including a distance measuring device,
The distance measuring device,
A distance measuring sensor disposed under the outer cover to measure a distance between the imprinted object and the laser irradiation unit;
A protective window which protects the distance measuring sensor and is made of a light transmissive material, and
A protective cover openable to selectively cover a lower portion of the protective window,
The laser irradiation unit,
A light receiving unit disposed at a front end and connected to a predetermined cable to receive a beam supplied from an external light source;
A nozzle unit disposed at a rear end and irradiating a beam to the outside;
An optical module provided between the light receiving unit and the laser nozzle unit and including a plurality of lenses; And
A unit housing in which the optical module is embedded;
Laser engraving device comprising a. The method of claim 1,
The optical module,
The beam size at the focal length position can be varied while the focal length of the laser beam irradiated through the nozzle portion is kept constant.
A front lens unit disposed adjacent to the light receiving unit;
A rear lens unit disposed behind the front lens unit, and
A variable lens unit disposed between the front lens unit and the rear lens unit,
The variable lens unit is a laser engraving device for varying the area of the beam incident to the rear lens unit. The method of claim 1,
The optical module,
The beam size at the focal length position can be varied while the focal length of the laser beam irradiated through the nozzle portion is kept constant.
A first lens unit for generating parallel light,
A second lens unit disposed behind the first lens and condensing a beam with a predetermined focal length;
A variable lens unit disposed behind the second lens unit,
A third lens unit disposed behind the variable lens unit and generating parallel light; and
A fourth lens unit disposed behind the third lens unit and condensing a beam with a predetermined focal length,
The variable lens unit is a laser engraving device for varying the area of the beam incident to the third lens unit. The method of claim 3, wherein
The variable lens unit,
A distance between the second lens unit and the variable lens unit and a distance between the variable lens unit and the third lens unit, including a lens that is movable between the second lens unit and the third lens unit. Laser engraving device. The method of claim 1,
The nozzle unit is made of Teflon material, the laser engraving device configured to be detachable. The method of claim 1,
Further comprising; but the inspection unit,
A mirror disposed within the unit housing and disposed on a beam path passing through the optical module, the mirror having a predetermined transmittance and reflectance, and
And a power sensor for capturing the beam reflected from the mirror and reading the intensity of the beam. The method of claim 6,
The inspection unit,
And a mounting part provided in the unit housing and on which the mirror is mounted. delete The method of claim 1,
It further comprises an air curtain device,
The air curtain device is a laser engraving device including a nozzle body for injecting air in the direction of the nozzle portion, and a connecting portion for changing the position of the nozzle body.

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