JPS591082A - Laser processing device - Google Patents

Abstract

PURPOSE:To process the work while conveying the same, by moving the spot of a laser reflected by a light polarizer in the same direction at the speed equal to the conveyance speed of the work. CONSTITUTION:A light polarizer which reflects the laser beam from a laser oscillator 2 toward a passage P, for example, a hexagonal columnar body 4 having mirror finished surfaces 41 on the outside circumference is provided freely turnably. The body 4 is turned at a specified angular speed around the axis X extending in the transverse direction of a web 1 in such a way that the spot by the laser beam reflected on the surface 41 is moved in the passage P in the same direction at the speed practically equal to the conveyance speed of the web 1. A control part 5 controls the oscillation of the oscillator 2 in accordance with the turning of the body 4.

Description

[Detailed description of the invention] The present invention relates to a laser processing apparatus.

Recently, it has been proposed to form machine codes at regular intervals on a web for recording the location of defects in a web of photographic film material. This means of forming position codes on the web at regular intervals is to record the position code immediately before the defective part of the web and the length from the position code to the position of the defective part. This is effective in that it can reduce errors and accurately detect the position of the defective part.

When forming the position code on the web, it is advantageous to use a laser to make holes in the side edges of the web and to identify the position code by determining the arrangement of the holes. In other words, the method using a laser is fast and can accurately form a hole in the desired shape and size at the desired location.Moreover, it is possible to reduce the diameter of the hole, thereby reducing the area occupied by the position code. It has various advantages such as being able to be made smaller, and since there is no contact between the position code forming mechanism and the web, there is no risk of display errors. Here, it is advantageous to perform the step of detecting and recording the position of the defective portion of the web while transporting the web after the step of coating and forming the photosensitive layer.
0 to 150"/, which is high speed. However, in the method using a laser, if the processing is performed before the web is conveyed, the size and shape of the web cannot be made as planned, and the above-mentioned advantages are lost. The number of deaths will be significantly reduced,
If a planned hole is to be obtained, the drilling must be completed in a fraction of a second, so the laser light intensity and therefore the power of the laser oscillator must be increased considerably. Furthermore, if the web is stopped when drilling holes with a laser, the efficiency of web manufacturing operations will be greatly reduced, and the advantage of the method using a laser, which is speed of processing, will be greatly sacrificed.

The present invention was made against this background, and an object of the present invention is to provide a laser processing device that can process a workpiece while transporting it without increasing the power of the laser oscillator. The purpose and feature of the laser processing device is to process a transported workpiece using a laser such as a laser oscillator, in which the laser beam from the laser oscillator is reflected toward the passage area of the workpiece. An optical deflector (t') is provided to cause the laser beam to be reflected by the optical deflector to move in the same direction at the same speed as the conveyance speed of the object in the passage area of the object to be processed. The point is that it can be operated so as to

The present invention will be explained below with reference to the drawings.

In FIG. 1, 1 is a web running along a path P at a constant speed, and in the present invention, a laser oscillator 2
A condensing lens 3 is provided in the optical path of the laser from the laser oscillator 2, and a light deflector or device for reflecting the laser from the laser oscillator 2 toward the path P, for example, has a mirror surface 41 on the outer periphery. A hexagonal columnar body (hereinafter referred to as "inner mirror") 4 is rotatably provided. This internal mirror 4 is an imported mirror extending in the width direction of the web 1 so that the laser spot reflected by the mirror surface 41 of the internal mirror 4 is moved in the same direction in the passage P at the same speed as the conveyance speed of the wear 1. It is rotated at a constant angular velocity.

Then, in response to the rotation of the inner mirror 4, the laser oscillator 2
A control section 5 is provided to control the oscillation operation of. This control section 5
#i, helium-neo/ provided opposite the inner mirror 4;
a light emitting section 51 consisting of a laser oscillator; a light receiving section 52 that generates one pulse signal when receiving a laser signal from the light emitting section 51 reflected by the mirror surface 41 of the inner mirror 4;
This pulse signal is used as an operating circuit 53 which generates an operating signal to operate the laser oscillator 2 for a certain period of time.

and a light emitting section 51. To explain the positional relationship between the light receiving unit 52 and the inner mirror 4 and the operating time of the laser oscillator 2, the above positional relationship determines the position of the laser processing area in the passage P, and the processing time is determined by the above operating time. The length of the region is determined. For example, as shown in FIG. 2, in order to make the processing area S have a length d centered at the intersection Q where the perpendicular line J drawn from the laser reflection point on the mirror surface 41 to the passage P intersects with the passage P. teeth,
The laser oscillator 2 is operated when the spot of the laser reflected by the mirror surface 41 is located at the rear end a of the processing area S, and therefore the light emitting part 51 is operated at the rotational position of the inner mirror 4 at this time. The positions of the light emitting part 51 and the light receiving part 5z are set so that the radar signal reaches the light receiving part 52, and the spot by the radar moves from the rear end a to the front end of the processing area S at a speed equal to the conveying speed of the web l. The operating signal is emitted from the operating circuit 58 only for the time required for the object to pass through the gate.

Here, an example of a position code formed by drilling a hole in the shield plate 1 using a radar will be explained. For example, the length from the leading edge of the web l can be expressed in meters, and the number and value can be displayed as binary information. If the total length of the web l is 1000 m, 10 equally spaced points at each position code 100 will be shown as shown in FIG. 4(A). 10 equally spaced as shown.

Point Al-A10O among points Al, l, A8. A5. A6
゜A? , make a hole in A9. That is, the part with a hole corresponds to rlJ expressed in binary notation, and the part without a hole corresponds to "0" expressed in binary notation. Here, the hole can have a diameter of 0.5H, for example,
Also, the distance between points Al-γAIO is, for example, 201
111. Additionally, this location code is 100
The first point A1 among points A1 to AIO is located on the front side (on the left side in the figure) at a distance M, which is larger than the distance between points A1 to AIO, along the length of the web l. Two holes lined up in the horizontal direction B1. Open B2 to form the first line P2O0, and also form the trailing point AIO of points A1 to AIO.
One hole Ct is located on the rear side (right side in the figure) at a distance M, which is larger than the distance between points Al-Al0.
A trailing cord 800 is formed with a gap of t. By forming the leading code 200 and trailing code 800 in this way, the order in which the 1-position codes 100 should be read is displayed, so that the position codes 100 can be read thereafter regardless of the running direction of the web 1c1'. . In order to make a hole in the position code 100, the operation signal may be generated using a pulse signal selected from among the pulse signals emitted from the light receiving section 5z.

In the above-mentioned radar processing apparatus.

As the inner mirror 4 rotates, a pulse signal is emitted from the light receiving section 5z every time the mirror surface 41 is placed in a position where it reflects the laser signal from the light emitting section 51 towards the light receiving section 52. When forming a position code such as, the pulse signal selected from among the pulse signals causes the operating circuit 58 to issue an operating signal for one moment, thereby causing the eighth factor (A), (B
), the laser spot is moved from the rear end a to the front end of the processing area S at a speed equal to the transport speed of the web 1, thereby making holes in the web l. Subsequently, an operating signal is generated from the operating circuit 58 in response to a pulse signal selected from among the pulse signals from the light receiving section 52, and thus holes are made in the web 1 at predetermined length intervals.

As described above, the radar processing apparatus according to the present invention includes the inner mirror 4 in the optical path of the radar oscillator 2.

This inner mirror 4 is rotated so that the radar spot reflected by it is moved in the same direction at the same speed as the conveyance speed of the web l in the path P of the web l. The spot remains stationary with respect to the web 1 being conveyed. As a result, even though the web 1 is being conveyed, the radar irradiation time on the web 1 can be extended, so that the radar light intensity and the power of the radar oscillator 2 can be reduced, and moreover, the web 1 can be irradiated with the radar at a predetermined position. Able to accurately drill holes of the planned shape and size. Therefore, if this device is used, for example, to form a position code on the web 1, the advantages of the method using radar can be utilized as is.

Here, when operating the radar oscillator 2, the light emitting section 51 and the light receiving section 52 were not provided and the data was stored in advance! It is also possible to make the radar oscillator 2 emit an operation signal at predetermined time intervals according to the program, or even if the conveyance speed of the web 1 is not constant, the conveyance speed of the web 1 can be detected and the detection signal can be sent. The operation of the optical deflector and the radar oscillator 2 can also be controlled so that these operations correspond to the transport speed of the web 1.

As the optical deflector used in the present invention, a galvanometer mirror and various other devices can be used.

Further, in order to move the radar spot using the optical deflector, the optical deflector may be oscillated.

As described above, the present invention is applicable not only to cutting holes in webs for position codes, but also to cutting webs, or heat treatment of other objects to be processed, such as heat treatment by radar, etc. Can be used.

As described above, according to the present invention, it is possible to provide a radar processing apparatus capable of processing a workpiece while conveying it without increasing the power of the radar oscillator.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a laser processing apparatus according to the present invention, FIG. 2 is an explanatory diagram showing an example of a processing area by a radar, and FIGS. An explanatory diagram showing the laser spot position corresponding to the start and end of the operation, Figure 4 (B) is an explanatory diagram showing an example of position information display, Figure 4 (B) is the position of Figure 4 (A) FIG. 3 is a plan view showing a position code P corresponding to information. 1... Web 2... Radie oscillator 8
...Condensing lens 4...Six-sided mirror 41...Mirror surface 5...Control unit 51...Light emitting unit
52... Light receiving part P... Passage S
---Processing area Fig. 4 (A) Fig. 4 (B)

Claims (1)

[Claims] 1) In a laser processing apparatus that processes a transported workpiece using a laser beam from a laser oscillator, an optical deflector is provided to reflect the laser beam from the laser oscillator toward a passage area of the workpiece. This optical deflector is characterized by being operated so that the reflected laser spot is moved in the same direction at the same speed as the transport speed of the processed object in the passing area of the processed object. Laser processing equipment.