JPH05261572A - Laser beam marking device - Google Patents

Abstract

PURPOSE:To simplify the set-up working for the laser marking by executing the judgement of the left or the right of the lens with the laser beam marking device. CONSTITUTION:A laser beam marking device provides an arithmetic means 13a, and this arithmetic means 13a judges the left or the right of a lens 1 mounted on a machining table 2 in the following manners. That is, at first, based on the picture of the lens 1 photographed with the CCD camera 12, the gravity position G of the lens 1 and the principal axis of inertia (X axis) are operated together with the XY coordinate making the gravity position G as the original point is set. Next, the point on the outline of the lens 1 which is the longest length from the original point G is made as the standard point A, and the angles theta1, theta2 that the straight line which joins this standard point and the original point G is made with the principal axis of inertial (X axis) are operated. Because the angle theta1 relatively becomes positive or negative at the lens for the right eye and the lens for left eye, respectively, the left or right is judged, thereby.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking device, and more particularly to a laser marking device for marking a non-circular lens.

2. Description of the Related Art Conventionally, as a laser marking apparatus, a laser oscillator for irradiating a laser beam on a lens, a mask having a required pattern provided on the optical path of the laser beam, a photographing means for photographing the lens, and a lens It is known that an adjusting means for adjusting an irradiation position of a laser beam is provided, and a marking of a predetermined pattern is performed at a predetermined position of a lens.

However, the conventional marking device described above cannot determine the right and left of the lens. Therefore, conventionally, the operator determines the left and right of the lens, determines the mounting direction according to the determined left and right of the lens, and then mounts the lens on the processing table. Moreover, conventionally, a pallet-shaped jig is prepared for each type of lens, and the lens is fixed on the processing table through the jig.
Therefore, conventionally, the preparation work for applying the laser marking has been complicated.

[Means for Solving the Problems] In view of such circumstances,
According to the present invention, in the above-mentioned laser marking device, the position of the center of gravity of the lens and the position of the principal axis of inertia of the lens are calculated based on the image of the lens photographed by the photographing means, and the position of the center of gravity is used as the origin and the principal axis of inertia of the inertia is calculated. While providing a calculation means for setting a coordinate system with the coordinate axis as, the storage means for storing the location to be marked in the lens as the predetermined coordinates of the coordinate system, further provided with a determination unit in the calculation means, The determination unit obtains a reference point on the contour of the lens that has the longest distance or the shortest distance from the origin, calculates the angle formed by the straight line connecting the reference point and the origin with the principal axis of inertia, and calculates the angle. The left and right sides of the lens are determined based on.

According to this structure, it is not necessary to prepare a large number of jigs for each type of lens, and the determination unit can determine the right and left of the lens to be processed. Therefore, it is possible to simplify the preparatory work for performing the laser marking as compared with the related art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an overall view of a laser marking apparatus. The laser marking device includes a processing table 2 on which the lens 1 is placed and is movable in XY directions, and a laser beam L is directed toward the lens 1 on the processing table 2.
Is provided with a laser oscillator 3. The lens 1 as the workpiece is a non-circular sunglasses lens as shown in FIGS. 2 to 3, and the left eye lens shown in FIG. 2 and the right eye lens shown in FIG. It has a shape. The lens 1 is mounted on the jig 4 in the form of a pallet for the left eye and the lens for the right eye separately, and is fixed on the processing table 2 while being mounted on the jig 4. I am trying. By moving the processing table 2 in the XY directions, the lens 1 can be positioned at a required position. A focus head 5 is provided above the processing table 2, and a focus lens 6 is held in the focus head 5. Then, when the laser beam L is emitted from the laser oscillator 3, the laser beam L is focused by the focus lens 6 via the mirror 7 and then irradiated on the lens 1 on the processing table. .. On the optical path of the laser beam L located between the laser oscillator 3 and the mirror 7, a disc-shaped mask 8 having a required printing pattern is arranged, and the mask 8 is wound around the mask 8. It can be rotated by a mask rotating device 11 including a rotated belt 9 and a driving motor 10. The mask 1 is rotated by rotating the mask 8 by the mask rotating device 11.
The print pattern can be rotated according to the orientation of the. Further, a CCD camera 12 as a photographing means is fixedly provided at a predetermined position on the processing table 2, and the lens 1 on the processing table 2 can be photographed by the CCD camera 12 by moving the processing table 2. It has become. The CCD camera 12 is connected to the control device 13, and the image taken by the CCD camera 12 is input to the control device 13. As will be described later in detail, the control device 13 includes a calculation means 13a for setting the position of the center of gravity of the lens 1 and a coordinate system having the center of gravity as the origin based on the image captured by the CCD camera 12. Further, it is provided with a storage means 13b in which a position where a print pattern is to be marked for each type of the lens 1 is stored in advance as specific coordinates of the coordinate system. And
In this embodiment, when actually marking a predetermined position of the lens 1, the lens 1 placed on the processing table 2 is photographed by the CCD camera 12, and the calculating means 13a is operated.
Then, the position of the center of gravity of the lens 1 is calculated and the coordinate system is set. Next, the specific coordinates to be marked, which are stored in the storage means 13b in advance, are specified on the coordinate system set by the calculation means 13a. Next, the processing table 2 is moved in parallel by the distance between the focus head 5 and the CCD camera and is also moved in the Y direction to position the lens 1 at the position below the focus head. Further, the mask 8 is rotated by the mask rotating device 11,
The mask 8 is positioned by rotating the mask 8 by a required angle so as to match the direction of the lens 1 positioned as described above. In this state, if the laser beam L is emitted from the laser oscillator 3, the print pattern of the mask 8 can be laser-marked at a predetermined position of the lens 1 placed on the processing table 2. Therefore, in this embodiment, the setting of the coordinate system by the calculating means 13a described above is performed as follows, and the right and left of the lens 1 can be determined by the determining unit 13c provided in the calculating means 13a. That is, as shown in FIG. 2, when the image photographed by the CCD camera 12 is input to the calculation means 13a, the calculation means 13a calculates the position of the center of gravity of the lens 1 based on the input image. The position of the center of gravity is X
Set as the origin G of the Y coordinate. Next, the position of the principal axis of inertia is calculated based on the origin G, the principal axis of inertia is set as the X axis in the XY coordinates, and a straight line orthogonal to the X axis and passing through the origin G is set as the Y axis. Next, the determining unit 13c finds a reference point A on the contour of the lens 1 having the longest linear distance from the origin G, and a straight line Z connecting the reference point A and the origin G is the X-axis ( The angles θ1 and θ2 formed with the principal axis of inertia) are calculated. The direction of the arrow attached to the X axis located on the smaller angle θ1 side of the angles θ1 and θ2 is defined as the positive direction of the X axis. As a result, the positive and negative directions of the Y axis are also determined, and the setting of the XY coordinates with the position of the center of gravity as the origin G is completed. Here, as described above, the left-eye lens and the right-eye lens are bilaterally symmetric, so that the angle θ1 in the left-eye lens 1 shown in FIG. With respect to the angle θ1 in the right-eye lens 1 shown in (1), when the X axis is the starting point, the rotation directions have a positive and negative relationship, and the absolute values of these angles θ1 are the same. Therefore, the determination unit 13c determines X
Assuming that the counterclockwise rotation angle of the angle θ1 with the axis as the starting point is positive and the clockwise rotation angle of the angle θ1 with the X axis as the starting point is negative, as shown in FIG. When the angle θ1 is positive, it is determined to be the lens for the right eye, and when the angle θ1 is negative as shown in FIG. 2, it is determined to be the lens for the left eye. .. As described above, when the left and right of the lens 1 placed on the processing table 2 is determined by the determination unit 13c and it is determined that the lens 1 is the left-eye lens 1 shown in FIG. Can specify the coordinates M of the location to be marked stored in the storage means 13b on the XY coordinates described above. Then, as described above, the machining table 2 is moved to X
When the mask 8 is rotated by the mask rotating device 11 while being moved in the Y direction, the positioning of the mask 8 and the lens 1 is completed, and the laser beam L from the laser oscillator 3 is completed.
When the lens is irradiated with, the printing pattern of the mask 8 can be marked at the coordinates M on the XY coordinates. As described above, in the present embodiment, the determination unit 13c provided in the calculation unit 13a can determine whether the lens 1 placed on the processing table 2 is on the left or right side, so that the operator uses the jig 4. The lens 1 can be fixed on the processing table 2 without paying attention to the left and right of the mounted lens 1. Further, conventionally, it was necessary to prepare a large number of jigs 4 for each kind of the lens 1, but according to the present embodiment, it is not necessary to prepare the jigs 4 for each kind of the lens 1, and one kind can be prepared. Good. Therefore, in this embodiment,
It is possible to simplify the preparatory work at the time of performing laser marking as compared with the conventional case. In the above embodiment, the angles θ1 and θ2 are calculated with the position on the contour of the lens 1 having the longest linear distance from the origin G as the reference point A. The position on the contour may be the reference point A. Further, in the above embodiment, the lens 1
Although the XY coordinates with the center of gravity of the lens as the origin G are used, polar coordinates with the center of gravity of the lens 1 as the origin G and the principal axis of inertia as the coordinate axis may be used. Further, while fixing the mask 8,
A conventionally known galvanometer mirror may be provided on the optical path of the laser beam L between the mask 8 and the mirror 7, and the printing pattern of the mask 8 may be rotated by the galvanometer mirror mask 8.

As described above, according to the present invention, the effect that the preparatory work for performing laser marking can be simplified compared to the conventional case can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic overall view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a lens for the left eye and its reference point and the like.

FIG. 3 is a diagram showing a relationship between a lens for the right eye and its reference point and the like.

[Explanation of symbols]

1 Lens 2 Processing Table (Adjustment Mechanism) 3 Laser Oscillator 4 Jig 8 Mask 11 Mask Rotating Mechanism 13a Calculating Means 13b Storage Means 13c Judgment Section

Claims (1)

[Claims] 1. A laser oscillator for irradiating a lens with a laser beam, a mask having a required pattern provided on the optical path of the laser beam, a photographing means for photographing the lens, and an irradiation position of the laser beam with respect to the lens are adjusted. In the laser marking device configured to perform marking of a predetermined pattern on a predetermined position of the lens, the position of the center of gravity of the lens and the principal axis of inertia of the lens are determined based on the image of the lens taken by the photographing means. The position of the center of gravity is used as the origin and the calculation means for setting the coordinate system with the main axis of inertia as the coordinate axis is provided, and the location of marking on the lens is stored as the predetermined coordinate of the coordinate system. The storage means is further provided, and the determination means is provided at the calculation means.
The reference point on the contour of the lens having the longest or shortest distance from the origin is obtained, the angle formed by the straight line connecting the reference point and the origin with the principal axis of inertia is calculated, and the lens is calculated based on the angle. A laser marking device characterized by determining the left and right sides of the.