Optical: systems and elements – Deflection using a moving element
Patent
1996-06-10
1997-12-30
Phan, James
Optical: systems and elements
Deflection using a moving element
359204, 359216, 359900, 347232, 347256, G02B 2608
Patent
active
057037094
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and a device for color laser marking, in particular, a method and a device for color laser marking which are suitable for marking patterns in different colors on the surface of the workpiece.
BACKGROUND ART
An example of the conventional technologies in this field is a method for marking on the surface of synthetic materials, as disclosed in Japanese Patent Laid-Open No. 56-144995. This technology includes coloring white, blue, violet, red, etc., the surface of synthetic materials which either contain dyestuffs and silicon-containing inorganic compounds or contain silicon-containing dyestuffs, by exposing the surface with a laser beam having an intensity of at least 1,000 kw/cm.sup.2, measured on the surface.
Although the above conventional technology enables coloring white, blue, violet, red, etc., visible coloring may still be useful even though the colors are not as distinct. Further, coloring for marking on the surface of the workpiece, without the drastic modifications of conventional laser marking devices and without using dyestuffs employed in the above conventional technology, may be useful.
SUMMARY OF THE INVENTION
The present invention provides a method and a device for color laser marking, which are suitable for marking patterns in different colors on the surface of the workpiece, considering such a conventional technology and desires.
The method for color laser marking of the present invention is characterized in that the workpiece is a synthetic material made from organic and inorganic materials, and patterns in different colors can be obtained by varying the received light intensity on the workpiece when irradiating the laser light. Further, when this construction is restricted to generated colors, the different colors are visually light grey, white, yellow, and yellowish brown.
According to such a construction, when the workpiece is a synthetic material made from organic and inorganic compounds, the patterns are colored so that the patterns can be recognized to be light grey, white, yellow, and yellowish brown. However, the coloring itself has not been theoretically clarified. Moreover, the received light intensity for promoting the coloring has to be determined in view of the entire marking device construction, because the received light intensity depends on the synthetic materials of the workpiece and the specifications of the laser marking device.
An example of the color laser marking device of the present invention is a device which uses the above method for color laser marking. A first color laser marking device is characterized in that when the workpiece is a synthetic material made from organic and inorganic materials, a controller outputs laser irradiation intensity varying signals to at least one of laser irradiation intensity varying means comprising a laser oscillator, a Q switch of the laser oscillator, a mask, and a drive motor of a raster scan deflector. A typical example of the mask is a transmission type liquid crystal mask.
The means for varying the received light intensity having the above construction comprises a controller for emitting commands to vary the received light intensity, and a laser irradiation intensity varying means which is connected with the controller and is controlled based on the commands. Thus, in this construction, patterns on the surface of the workpiece are automatically colored by appropriately driving the laser irradiation intensity varying means with the controller.
A second color laser marking device of the present invention is characterized in that the workpiece is a synthetic material made from organic and inorganic materials; an optical system comprises at least one of a lens, prism, and mirror for deflection, collection, magnification, division, light attenuation, or mode change; and the optical system comprises a structure so that at least one of the lens, prism, and mirror is exchangeable with various optional parts which power-separate or reflectively scatter the laser light
REFERENCES:
patent: 5309273 (1994-05-01), Mori et al.
patent: 5574492 (1996-11-01), Suzuki
Hagiwara Shigeki
Mori Akira
Tanaka Hirokazu
Komatsu Ltd.
Phan James
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