JP2757022B2 - Marking method and device - Google Patents

Description

The present invention relates to a method and apparatus for marking by letterpress printing.

2. Description of the Related Art Conventionally, for example, in a marking device for a semiconductor device, a double-sided tape is attached to a plate base, and a plate for letterpress printing is visually adhered to the double-sided tape by using a pair of tweezers or the like. For this reason, the plate is slightly displaced with respect to the plate base. In order to correct the positional deviation, the operation of actually performing printing, confirming the positional deviation of the plate, removing the plate from the plate base, and reattaching the plate is repeated.

[Problems to be Solved by the Invention] In the above-described conventional technology, when correcting the misregistration of the plate, the work of re-attaching the plate is repeated. Therefore, it takes time to correct the misregistration, and the adhesion state is deteriorated. There was a problem that trash could enter between the plate stands.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a marking method and an apparatus which can easily correct a misregistration of a printing plate in a short time.

[Means for Solving the Problems] A marking method for achieving the above-mentioned object is to attach a plate to a plate stand and to displace the plate stand and the plate at a position distant from the work placement table on which the work is positioned and placed. Calculate the amount of deviation between the two by imaging using a camera, when moving the plate stand from the imaging position of the plate and the plate by the camera above the work placed on the work placement table, The printing apparatus is characterized in that the printing is performed by moving the plate by the corrected moving amount and by aligning the plate with the work to be printed.

A marking device for achieving the above object includes a plate base on which a plate is mounted, rotating means for rotating the plate base, XYZ moving means for moving the plate base in XY and Z directions, and positioning and placing a work to be printed. A camera disposed at a position distant from the work mounting table to face the mounting surface of the plate base,
An image processing device that processes an image signal of the camera, and a monitor device that displays an image based on the output of the image processing device are provided, and the plate stand is positioned above the camera by driving the XYZ driving unit. The displacement of the plate and the plate is imaged, the displacement of both is processed by the image processing device, and the XYZ is corrected so as to correct the displacement when the plate is moved above the work. The driving means is driven.

[Operation] According to the marking method, a positional shift between the plate and the plate base is detected by the camera. The position of the plate is determined by correcting the positional deviation and positioning the plate above the work.

According to the marking device, the plate base can be moved in the θ direction and the XY direction by the rotating means and the XY driving means. Then, the platen is positioned above the camera, the platen and the camera are relatively moved to detect a positional deviation between the plate and the platen, and the positional deviation is added to position the platen above the workpiece. Thereby, the positioning of the plate is performed.

Example An example of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a plate base 2 to which a plate (rubber stamp) 1 is adhered is adapted to be detachably mounted on a rotating shaft 3, and the rotating shaft 3 is rotatably supported on a first moving base 4. Have been. The rotation shaft 3 is rotated by a θ-direction drive motor 5 fixed on an upper part of the first moving table 4. First mobile platform 4
Is a Z-direction feed screw 8 slidably provided on a guide rod 7 vertically disposed on the second movable base 6 and supported in a rotatable manner on the second movable base 6 in parallel with the guide rod 7. Is screwed into. The Z-direction feed screw 8 is driven via a belt means 10 by a Z-direction drive motor 9 fixed to the second moving table 6. The second movable base 6 is slidably provided on a guide rod 12 disposed in the Y direction, which is horizontal to the third movable base 11, and is rotatable parallel to the guide rod 12 and rotatable on the third movable base 11. It is screwed to the supported Y-direction feed screw 13. The Y-direction feed screw 13 is a Y-direction drive motor 14 fixed to the third movable base 11.
Driven by The third movable base 11 is slidably provided on the base 15 in a horizontal X direction, and is driven by an X-direction drive motor 16 fixed to the base 15 via an X-direction feed screw (not shown). Driven.

Therefore, when the θ direction drive motor 5 is driven, the plate base 2 is rotated in the θ direction. When the Z-direction drive motor 9 is driven, the Z-direction feed screw 8 is rotated via the belt means 10, and the plate 2 is moved in the Z-direction together with the first moving table 4. When the Y-direction drive motor 14 is driven,
The second moving table 6 is moved in the Y direction by the direction feed screw 13, and the plate table 2 is also moved in the Y direction. Similarly, X
When the direction drive motor 16 is driven, the third movable table 11 is moved in the X direction, and the plate 2 is also moved in the X direction.

As shown in FIG. 2, an ink table 23 containing ink 22 is provided at a position in the X direction away from a work table 21 on which a work 20 to be printed is positioned and mounted.

Therefore, printing is performed by repeating the operation shown by the solid line in FIG. That is, the ink 22 is applied to the plate 1 and printed on the work 20 by a combination of the Z-direction movement of the plate 2 by the Z-direction drive motor 9 and the X-direction movement of the plate 2 by the X-direction drive motor 16. You.

Further, at a position distant from the work mounting table 21, a camera 30 is disposed with the imaging surface facing upward, and a video signal of this camera 30 is processed by a video processing device 31 and displayed by a monitor device 32. . The mounting surface 2a of the plate base 2
Is provided in advance with a cross-shaped reference line 2b. Version 1
Also, as shown in FIG. 3, the alignment line 1a is formed lower than the printed characters 1b and the like.

Next, a method of correcting the positional deviation of the printing plate 1 by the marking device will be described with reference to FIG. This correction is performed by the operation shown by the dashed line in FIG. Now, when marking the work 20 on the work mounting table 21, the regular coordinates of the center of the plate 2 when the plate 2 is located above the work 20 are defined as P ₁ (x ₁ , y ₁ ). The XY axis at the center of the camera 30 displays a cross-shaped reticle 32a on the monitor device 32 as shown in FIG. 4 (a).

Therefore, in a state where the plate 1 is not mounted, the Y direction drive motor 14 and the X direction drive motor 16 are driven to
Is positioned directly above the camera 30, and then the Z-direction drive motor 9
Is driven to bring the reference line 2b of the plate base 2 into focus of the camera 30. Next, the θ direction drive motor 5 is driven, and FIG.
The reference line 2b of the plate 2 is aligned with the reticle 32a on the display surface of the monitor 32 as shown in FIG. Reference line 2b of plate stand 2 at this time
Let P ₂ (x ₂ , y ₂ ) be the coordinates of the center line of.

The operation of aligning the reference line 2b with the reticle 32a described above includes:
By manually operating a well-known electric tusman (not shown) by an operator, the motors 16, 14, 9, and 5 can be driven to perform x ₂ , y ₂ by the X-direction drive motor 16 and the Y-direction drive motor 14. The coordinates, the z-coordinate can be detected by the Z-direction drive motor 9, and the θ-coordinate can be detected by the θ-direction drive motor 5, and the coordinates P ₂ (x ₂ , y ₂ , z,
θ) is stored in an arithmetic circuit (not shown).

Next, the plate base 2 is moved to an arbitrary position where it is easy to work, the plate base 2 is removed from the rotating shaft 3, and the plate 1 is attached to the mounting surface 2 a of the plate base 2. In this case, the alignment line of plate 1 is
Paste 1a together, but about 0.3m in XY direction because it is pasted by hand
A displacement of 0.5 degrees in the m and θ directions is inevitable. And
The plate base 2 is attached to the rotating shaft 3 again, the plate base 2 is moved to the position of the coordinates P ₂ (x ₂ , y ₂ , z, θ) stored as described above, and the display surface of the monitor device 32 is again displayed. The state is displayed above (FIG. 4 (b)). At this time, since the bonded plate 1 is always shifted, the alignment line 1a provided on the plate 1 is shifted with respect to the reticle 32a of the monitor device 32. Therefore, first, the plate base 2 is rotated by the θ-direction drive motor 5 to correct the deviation in the rotation direction (FIG. 4 (c)). This operation is performed using an electric chessman as in the case described above, and the correction amount △ θ at that time is stored. Subsequently, similarly, the displacement amounts 駆 動 x, Ｙy in the planar direction are corrected by the X-direction drive motor 16 and the Y-direction drive motor 14, and the coordinates P ₃ (x ₃ , y ₃ ) at that time are stored. (FIG. 4 (d)).

 Accordingly, the deviation amounts △ x, △ y are as follows.

Δx = x ₂ −x ₃ Δy = y ₂ −y ₃ Then, the actual coordinates P (x, y) to be printed on the work 20 are as follows.

x = x ₁ + △ xy = y ₁ + △ y The coordinates P are processed by an arithmetic circuit (not shown).

Next, in the state corrected as shown in FIG.
The X-direction drive motor 16 and the Y-direction drive motor 14 are driven so that is located at the coordinates P (x, y). Thereafter, printing is performed by pressing the plate 1 against the work 20 by moving the plate base 2 up and down.

When the plate base 2 is moved above the work 20 from above the camera 30 as described above, the stored displacement amounts △ x and △ y are added as correction values to perform positioning, and thus the displacement of the plate 1 Does not appear as a shift in the printing position.

[Effects of the Invention] As is clear from the above description, according to the present invention, the misalignment of the plate with respect to the plate can be detected by relatively moving the plate and the camera, and the plate is pasted once. The work can be performed extremely easily and in a short time, because there is no need to re-paste.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a marking device according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a printing operation and an operation for correcting misregistration of a plate, FIG. 3 shows a plate, and FIG. Figure,
4B is a front view, and FIGS. 4A to 4D are explanatory diagrams of a shift amount correcting method according to an embodiment of the present invention. 1: Plate, 2: Plate base, 2a: Mounting surface, 4: 1st slide, 5: θ direction drive motor, 6: 2nd slide, 8: Z direction feed screw, 9: Z direction drive motor, 11 : 3rd carriage, 13: Y direction feed screw, 14: Y direction drive motor, 16: X direction drive motor, 20: Work, 21: Work mounting table, 30: Camera, 31: Video processing device, 32: Monitor apparatus.

Claims (2)

(57) [Claims] An image of a positional shift between a plate and a plate base is taken using a camera at a position distant from a work mounting table on which a plate is mounted on a plate base and the work is positioned and mounted, and a shift amount between the two is calculated. ,
When the platen is moved from the imaging position of the platen and the plate by the camera to a position above the work placed on the work table, the plate is printed by moving the platen by a movement amount corrected for the shift amount. A marking method characterized by performing printing in alignment with a work. 2. A plate base on which a plate is mounted, rotating means for rotating the plate base, XYZ driving means for moving the plate base in XY and Z directions, and a work mounting table for positioning and mounting a work to be printed. A camera disposed at a position facing the mounting surface of the plate base, a video processing device for processing a video signal of the camera, and a monitor device for displaying a video by an output of the video processing device, The XYZ driving means is driven to position the plate base above the camera, and the positional deviation between the plate base and the plate is imaged, and the amount of deviation between the two is processed by the image processing device, and the plate base is processed. A marking device that drives the XYZ driving means so as to correct the shift amount when the object is moved above the work.