Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1997-09-11
1999-04-20
Epps, Georgia
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359202, 359196, 395103, 33677, G02B 2714, G02B 2608, B41B 1500
Patent
active
058962336
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for correcting a marking position of a laser marker.
BACKGROUND ART
A device whereby a desired pattern is marked onto a specimen by irradiating the specimen with laser light is disclosed in Japanese Patent Publication 4-39646.
In the device disclosed in this patent, reference marks are provided at prescribed intervals in the X direction at the specimen stage, photodetector elements are provided, laser light is scanned in the X direction prior to actual marking, the divergence .DELTA.X from the reference mark is determined for each reference mark from the timing at which light is received at each photodetector element, and the position of laser irradiation in the X direction is corrected for each reference mark on the basis of the divergence .DELTA.X for each reference mark.
However, in the aforementioned device, since the position is corrected in reference mark units, a memory having a very large memory capacity is required in order to record and store data on the divergence, .DELTA.X, for each reference mark, therefore leading to high costs. Furthermore, since it is necessary to read out and calculate computer data on the divergence, .DELTA.X, for each reference mark, time is required for processing and high-speed processing cannot be achieved.
On the other hand, in a laser marker already implemented by the present applicant, although the composition of the device, which is premised on the use of a liquid crystal mask, or the like, differs from the prior art laser marker described above, there is a demand for correction of the marking position to be carried out at low cost and high speed.
The present invention was devised in view of the foregoing, its object being to provide a laser marker wherein the marking position can be corrected by means of a simple calculational process using a small quantity of corrective data, thereby enabling reductions in cost and increases in speed to be achieved.
DISCLOSURE OF THE INVENTION
The object of correcting the marking position by means of a simple calculational process using a small quantity of corrective data, thereby enabling reductions in cost and increases in speed to be realized, is achieved by a configuration that a marking position correction device for a laser marker which comprises: display means for dividing a marking pattern of an original image which is to be marked onto an object into marking patterns of divided images, and displaying the marking patterns of the divided images on a liquid crystal display screen; optical means for irradiating laser light generated by a laser light source onto the liquid crystal display screen and irradiating light which has permeated the liquid crystal display screen through a lens onto the object; lens moving means for moving the lens by a movement distance corresponding to a movement command signal, so as to mark the marking pattern of the divided image displayed on the liquid crystal display screen onto a position on the object corresponding to the movement distance; and control means for calculating the movement distance of the lens for marking the marking pattern of the divided image onto a desired position on the object corresponding to the divided image on the basis of a design parameter of the lens and the movement distance of the marking position up to the desired marking position, and outputting a movement command signal corresponding to the calculated lens movement distance to the lens moving means, characterized in that beforehand on the basis of a production tolerance of the lens and the lens movement distance is calculated on the basis of a design parameter of the lens corrected by the corrective value and the movement distance of the marking position up to the desired marking position, and by outputting a corrected movement command signal corresponding to the calculated lens movement distance to the lens moving means, the marking pattern of the divided image is marked onto the desired marking position.
Namely, in a lens marking device wherein
REFERENCES:
patent: 4146380 (1979-03-01), Caffarella
patent: 5309273 (1994-05-01), Mori et al.
patent: 5430665 (1995-07-01), Jin
patent: 5663826 (1997-09-01), Tsuda
patent: 5801868 (1998-09-01), Hayasaka
Supplementary European Search Report in EP 96 90 6919 mailed Jul. 20, 1998 (completed Jun. 15, 1998).
International Search Report in PCT/JP96/00747 mailed Jun. 18, 1996.
Misugi Koji
Soda Akihiko
Yoshida Koji
Epps Georgia
Komatsu Ltd.
Lucas Michael A.
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