JP2001150176A - Dust collector for laser beam marking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a marking defect by discharging the burnt soot generated in laser beam marking. SOLUTION: The dust collector, in which marking is conducted by irradiating a resin product 7 arranged near an opening part 12 through an image forming lens 1 with a laser beam 20 and the burnt soot generated from the resin product 7 is dust collected, is provided with an outdoor air suction port 15 arranged to a dust collection duct 3 near the image forming lens 1 and discharge ports 4a, 4b arranged to a dust collection duct 3 near the opening part 12. In this way, the air sucked from the outdoor air suction port 15 is discharged by the suction from the discharge port 4a, 4b. As a result, when irradiating the resin product 7 arranged near the opening part 12 through the image forming lens 1 with the laser beam 20, the burnt soot 22 spattered from the resin product 7 is drawn toward the discharge ports 4a, 4b, the burnt soot 22 is not stuck on the image forming lens 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a product,
The present invention relates to a laser marking dust collecting device for marking a number or the like.

[0002]

2. Description of the Related Art Since laser marking is high speed and low cost, its use range is wide, but there is a problem in marking quality, and improvement is desired. A dust collection duct is installed between the imaging lens and the product in order to cause burning soot to scatter when the product is irradiated with laser light, causing marking defects and surrounding contamination due to laser light interference. However, the lack of an air intake required to quickly exhaust the intake air below the imaging lens and the fact that soot floats easily in the laser beam direction due to one-way suction increase the marking defect rate. Had become a factor. Hereinafter, a conventional dust collection mechanism will be described.

FIG. 2 is a front view of a conventional dust collecting mechanism. 1 is an imaging lens, 2 is a connection bracket for attaching a dust collection duct 3 fixed to the tip of the imaging lens 1, 3 is a dust collection duct, which is fixed with a thumb screw 16, and its opening to increase dust collection efficiency. 12 is brought closer to the resin product 7. 4
a is a discharge port installed on one side of the dust collection duct 3, 5a is a hose inserted into the discharge port 4a, and the hose 5a is connected to a vacuum dust collector. (The vacuum dust collector is not shown in this drawing.) 6 is an air nozzle provided at a position directly opposite to the discharge port 4a to assist the vacuum suction force and increase discharge efficiency, and 7 is conveyed in the direction of arrow A. A resin product, 8 is a feed guide rail for the resin product 7, and 9 is a chucking feed claw for moving the product 7, which is slid and guided by a linear guide 10. The chucking feed claws 9 are driven by a servomotor. Reference numeral 11 denotes a photo sensor for recognizing the position of the resin product 7 to be conveyed and obtaining a marking timing, 12 denotes an opening of the dust collection duct 3, 13 denotes air around the opening 12, and 14 denotes a lower part of the imaging lens 1. It is air.

[0004] The state of air discharge of the conventional dust collection mechanism configured as described above will be described. The resin product will be described as an example of a semi-finished product in which semiconductor elements mounted on multiple lead frames are resin-sealed. First, the resin product 7 is placed before the marking position 21 by the photo sensor 11.
Is controlled so that marking is performed at the marking position 21. In addition, the laser marking mechanism shown in this drawing employs a method of performing continuous marking on the resin product 7 instantaneously while moving the resin product 7, thereby achieving high-speed marking. When the resin product 7 is conveyed and the resin product 7 is irradiated with the laser light 20 at the marking position 21, the combustion soot 22 is scattered around at a moment.
And soot 22 is continuously scattered. At this time, the vacuum precipitator and the air blow have already been started (always operating), and high-speed air movement has occurred between the discharge port 4 and the air nozzle 6 in the direction of arrow B, so that the air 13 around the opening 12 is drawn in. Then, the generated soot 22 is caught and introduced into the dust collection duct 3. The introduced air instantaneously fills the inside of the dust collection duct 3 in a turbulent state, and is then sucked into the discharge port 4a. In other words, part of the soot 22 sucked through the opening 12 is directed directly toward the outlet 4a, and part is directed toward the imaging lens 1. Considering the cause of this air wraparound in the direction of the imaging lens 1,
First, in order to generate a flow in the air, it is necessary to inhale and discharge the air in principle. Air 1 below the imaging lens 1
In 4, the discharge takes place via the outlet 4, and the suction necessarily takes place from the direction of the only opening 12 of the dust collecting duct 3. The air sucked from the opening 12 is the imaging lens 1
The air flows in the lower part and turns back in the direction of the discharge port 4, so that turbulent air flows.

[0005]

However, in the above-described conventional configuration, the soot 22 sucked from the opening 12 rises to the position of the imaging lens 1 and adheres to the lens surface.
Further, since the moving soot 22 has a fluid structure that easily blocks the laser beam 20, the laser beam 20 is obstructed, causing a defect in which marking characters, lines, and patterns partially disappear. In addition, the frequency of lens cleaning has been increased.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and suppresses the inflow of inhaled air in the direction of the imaging lens, thereby making it more difficult for soot to adhere and moving soot to the laser. An object of the present invention is to provide a laser marking dust collecting device having a fluid structure that does not easily block light.

[0007]

According to a first aspect of the present invention, there is provided a laser marking dust collecting apparatus having a cylindrical shape having an imaging lens at one end and an opening at the other end. A laser marking dust collecting device that includes a dust collecting duct, irradiates a laser light to a product arranged near an opening through an imaging lens to perform marking, and collects combustion soot generated from the product. And an outside air intake port provided in the dust collection duct near the imaging lens, and an exhaust port provided in the dust collection duct near the opening.

As described above, since the air intake port provided in the dust collection duct near the imaging lens and the exhaust port provided in the dust collection duct near the opening are provided, The sucked air can be discharged by suction from the discharge port. Along with this, when irradiating the laser light to the product placed near the opening through the imaging lens, the combustion soot scattered from the product is drawn to the outlet by the suction air, and the combustion soot adheres to the imaging lens And laser marking can be performed for a long time.

According to a second aspect of the present invention, in the first aspect of the present invention, the pair of discharge ports are provided at opposing positions near the opening of the dust collecting duct. As described above, since the pair of discharge ports are provided at opposing positions near the opening of the dust collection duct, the airflow in the dust collection duct is well balanced, and the combustion soot is efficiently and smoothly discharged, and the dust collection is performed. The efficiency is further improved. In addition, since the intake air to the outlets provided at positions opposite to each other is equally branched into two, soot moves in a direction away from the laser light, so that laser light is less likely to be blocked by the soot.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a partially sectional front view of a laser marking dust collecting apparatus according to an embodiment of the present invention. As shown in FIG. 1, the laser marking dust collecting apparatus includes a cylindrical dust collecting duct 3 having an imaging lens 1 at one end and an opening 12 at the other end, and a dust collecting duct near the imaging lens 1. It has an outside air inlet 15 provided in the duct 3 and two branch outlets 4 a and 4 b provided in the dust collection duct 3 near the opening 12, and is arranged near the opening 12 via the imaging lens 1. A laser beam is applied to the finished resin product 7 to perform marking, and the combustion soot generated from the product is collected.

The imaging lens 1 comprises a lens body 1a and an outer cylinder 1b for holding the lens body 1a. Outlet 4a,
4b is installed on both sides of the dust collecting duct 3 so as to face each other, and a pair of hoses 5a and 5b are inserted therein. The hoses 5a and 5b are connected to one vacuum dust collector (not shown). The outside air suction port 15 is provided around the connection bracket 2, and in FIG. The air 13 around the opening 12 and the lower air 14 of the imaging lens 1 during operation of the vacuum dust collector are as shown by arrows in FIG. In FIG. 1, reference numeral 7 denotes a resin product conveyed in the direction of arrow A, 8 denotes a feed guide rail for the resin product 7, 9 denotes a chucking feed claw for moving the resin product 7 in the direction of arrow A, Slide guide. The feed claw 9 is driven by a servomotor. 11
Is a photosensor for recognizing the position of the conveyed resin product 7 and obtaining a marking timing, and its basic constituent parts are the same as those of the conventional mechanism. The suction capacity of the dust collector is the same as the conventional one. The difference from the conventional mechanism is that the outside air suction port 15 is provided in the connection bracket 2 and the discharge port of the dust collection duct 3 is branched into two points.

Next, the operation of the laser marking dust collecting apparatus having the above configuration will be described. In FIG. 1, reference numeral 20 denotes a laser beam, 21 denotes a marking position, and 22 denotes combustion soot. Since the operations of the resin product 7 and its transporting portion are the same as those of the conventional mechanism, the description thereof will be omitted, and only the state of dust collection will be described. The soot 22 is generated by the irradiation of the laser beam 20. At this time, air suction is generated by the outlets 4a and 4b, and the air 13 around the opening 12 is drawn in, so that most of the soot 2
2 and is discharged by the flow C of air introduced into the discharge ports 4a and 4b, and a part of the soot 22 flies. Here, the outside air suction port 15 which is the first point of the present invention is installed on the connecting bracket 2, and the air is sucked from the outside air suction port 15 simultaneously with the suction from the opening 12, and the imaging lens is formed. The lower air 14 has a flow D that smoothly descends toward the discharge ports 4a and 4b. Therefore,
The soot 22 which has risen is lowered by the flow D of air and is collected. The air flows C and D join and the outlets 4a, 4
b. The opening area of the opening 12 was reduced to half, and the reduced area was defined as the opening area of the outside air suction port 15. That is, the opening area ratio between the opening 12 and the outside air suction port 15 is equal to 1: 1 and the flow rates and flow rates of the flows C and D are equal.

Here, the total opening area of the opening 12 and the outside air inlet 15 is the same as that of the conventional mechanism, and the suction resistance does not change, so that the dust collecting ability does not change. Since the flow D of air sucked from the opening 12 is blocked by the flow velocity equalization, there is slight scattering due to the recoil of the merging, but the soot 22 is prevented from wrapping in the direction of the imaging lens 1. Will be. Although this outside air suction port 15 is installed in the connection bracket 2 in FIG. 1, it goes without saying that it can be installed in the imaging lens outer cylinder 1b and other parts. However, from the viewpoint of the efficiency of discharging the soot 22, it is desired to install the soot 22 in a portion as close as possible to the imaging lens 1. A second point of the present invention is that the outlets 4a and 4b provided at positions diametrically opposite to each other are provided.
The soot 22 flows in the direction away from the optical axis of the laser beam 20 because the air sucked into the air flows into the flows C and D and is equally branched into two, so that the laser beam is not easily blocked by the soot 22 It is.

As described above, according to this embodiment, the air sucked from the outside air suction port 15 can be discharged by suction from the discharge ports 4a and 4b. When the laser light 20 is applied to the resin product 7 disposed in the vicinity, the combustion soot 22 scattered from the resin product 7 is drawn to the outlets 4a and 4b by the suction air, and the combustion soot 22 adheres to the imaging lens 1. Disappears.
Further, since the pair of outlets 4a and 4b are provided at opposing positions near the opening 12 of the dust collecting duct 3, the dust collecting duct 3
The airflow inside is well-balanced, and the air is efficiently and smoothly discharged. Therefore, in this embodiment, the marking defect rate was reduced to 1/5 of the conventional one. In addition, the discharge speed was reduced due to the elimination of the high-pressure air blow and the two branches of the discharge port, but the dust collection efficiency was improved.

There may be one or three or more outlets, and any number of outside air suction ports may be provided.

[0016]

According to the laser marking dust collecting apparatus of the present invention, the outside air suction port provided in the dust collecting duct near the imaging lens and the discharge port provided in the dust collecting duct near the opening are provided. Therefore, the air sucked from the outside air suction port can be discharged by suction from the discharge port. Along with this, when irradiating the laser light to the product placed near the opening through the imaging lens, the combustion soot scattered from the product is drawn to the outlet by the suction air, and the combustion soot adheres to the imaging lens No longer. That is, since the fluid structure suppresses laser light interference caused by soot adhering to the imaging lens and moving soot, the marking defect rate and the frequency of lens cleaning can be reduced, which is very useful in practice.

According to the second aspect of the present invention, since the pair of discharge ports are provided at opposing positions near the opening of the dust collection duct, the airflow in the dust collection duct is well-balanced, and the combustion soot is efficiently and smoothly discharged. The dust collection efficiency is further improved. Also,
Since the soot moves into the direction away from the laser beam by equally dividing the intake air into the outlet provided at the position opposite to each other into two, the laser beam is less likely to be blocked by the soot, and the defect rate is further reduced. Decrease.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of a laser marking dust collecting apparatus according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of a conventional laser marking dust collecting apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 imaging lens 2 connection bracket 3 dust collecting duct 4 a, 4 b outlet 5 a, 5 b hose 6 air nozzle 7 resin product 8 feed guide rail 9 chucking feed claw 10 linear guide 11 photo sensor 12 opening 13 surrounding opening 12 Air 14 Lower air of the imaging lens 1 15 External air suction port 16 Thumb screw

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 23/00 H01L 23/00 A

Claims (2)

[Claims] 1. A cylindrical dust collecting duct having an image forming lens at one end and an opening at the other end, wherein laser light is applied to a product disposed near the opening via the image forming lens. A laser marking dust collecting device that irradiates and performs marking, and collects combustion soot generated from the product, wherein an outside air inlet provided in the dust collecting duct near the imaging lens and the opening. And a discharge port provided in the dust collection duct near the unit. 2. The laser marking dust collecting apparatus according to claim 1, wherein the pair of outlets are provided at opposing positions near the opening of the dust collecting duct.