Abstract:
In the field of the storage and retrieval of information, information records in the form of patterns of microspots of small size and high packing density are formed on a record web by the use of a focussed first laser beam, of a first level of intensity, to evaporate or burn away material to form microperforations in a thin layer of opaque first material on a web of transparent plastic. This invention covers the process of preparing a facsimile record of the pattern of microspots on a master record by exposing a second record web through the microperforations in the first web to a constant intensity focussed second laser beam of less intensity than the first level of intensity. Also means are shown for using an optical pattern on a first layer to control a laser to burn openings into an opaque underlying layer.
Abstract:
Integrated circuit mask patterns are laser machined by mounting substrates on a support that is periodically stepped in a y direction after each scan by a laser writing beam in an x direction. X-direction scanning is accomplished by mounting a mirror on a carriage that reciprocates by rebounding between two displaced coil springs. A coding laser beam is reflected from the carriage through a stationary code plate, comprising alternate transparent and opaque stripes, to monitor the position of the carriage and to control the modulation of the writing beam.
Abstract:
Method and apparatus for engraving the cells of a printing surface to a controlled amount by controlling the spatial distribution and time duration of the trajectory of an energy beam having a cross-section smaller than the cell to be engraved thereby.
Abstract:
Integrated circuit mask patterns are laser machined by mounting substrates on a support that is periodically stepped in a y direction after each scan by a laser writing beam in an x direction. X-direction scanning is accomplished by mounting a mirror on a carriage that reciprocates by rebounding between two displaced coil springs. A coding laser beam is reflected from the carriage through a stationary code plate, comprising alternate transparent and opaque stripes, to monitor the position of the carriage and to control the modulation of the writing beam.
Abstract:
A laser data recording system for storing digital information in the form of digital bits ablated from an energy-absorbing storage medium by an intensity modulated laser beam. The system provides instantaneous reflective readout of the local surface state of the storage medium as the ablative recording process is initiated at selected locations along a scan line, in response to the intensity of the modulated laser beam. This reflective readout simultaneously provides a recording surface continuity verification signal which is monitored to insure that the storage medium surface is free from defects at the point of recording. The proper sequence of levels of this instantaneous reflective signal verifies that the portions of the data record which are to be ablated are actually generated, and that the regions which are not to be ablated are void-free, thus insuring a completely correct recording. The laser beam is scanned in parallel scan lines across the storage surface and during read-out of stored information the intensity of the laser beam is set at a fixed level sufficiently low that ablation cannot occur. Signals are also provided for automatically centering the laser beam on selected scan line and for servo control of laser intensity. In one embodiment removable and replaceable recording strips are mounted around the surface of the drum. A rectangular crosssection is optically imparted to the laser beam.
Abstract:
1,222,057. Perforating by burning. CONSOLIDATED PAPER (BAHAMAS) Ltd. 1 'April, 1969 [9 April, 1968], No. 17018/69. Heading B4B. A moving web or sheet of material 1 is measured by accurately spacing a reference mark sensing-station 25 downstream of a reference mark forming-station 17, forming a first reference mark 3 at the station 17 by electrically perforating the web 1 as it passes through the station 17, sensing the first mark 3 as the web passes through the sensing station 25, actuating the forming-station 17 on sensing the first mark 3 to produce a second reference mark 3, continuing the procedure to form a series of spaced reference marks 3, and counting the number of marks 3. Preferably, marks 3 invisible to the naked eye but detectable by optical means, including a light source 18 and photomultiplier (29), Fig. 4 (not shown), are produced, e.g. in a paper web 1, by spark dixcharge between electrodes 7, 9, or by means of a laser beam, and specific patterns of holes may be formed, e.g. to reproduce coded information.
Abstract:
A laser system for processing surfaces of a variety of materials. The amount of laser treatment received is controlled by a probability distribution matrix that is programmed into a control computer. In particular, the control computer can control a scanning laser beam to simulate the statistically random property of the particle distribution in a sandblasting process to generate a feathered worn look.
Abstract:
An optical system for laser marking, such as for engraving marks such as numbers and dates on surfaces, and exhibiting improved efficiency and improved quality of the resulting mark. The optical system includes a focusing system, such as a lens, and a concave mirror situated between the laser and the mask with its vertex at the focal point of the focusing system and its reflecting surface facing the mask. An inlet opening in the concave mirror is formed about the vertex, and the transverse measurement of the inlet opening is slightly larger than the transverse measurement of the focal point. The mask is formed as a mirror, preferably a plane mirror, with the reflecting surface facing the concave mirror, and the radius of curvature of the concave mirror is longer than twice the distance between the mask and the concave mirror. In operation, the portion of the laser beam radiated through the mask is increased because the portion thereof not passing directly through the mask openings is reflected by the mirror face of the mask back to the concave mirror, which in turn reflects the light back to the mask, such that additional portions of the laser beam pass through the mask openings. The size of the reflecting surface of the concave mirror and consequently the amount of the light reflected by the concave mirror are optimized by the laser beam being focused by the focusing system in the small opening in the vertex of the mirror.
Abstract:
Decorative processing is performed with repetitively pulsed discharge at atmospheric pressure of a (RP TEA) by CO.sub.2 laser with pulse energy 1 to 5J, power density at operation from 1.times.10.sup.6 W/cm.sup.2 to 6.times.10.sup.7 W/cm.sup.2, pulse duration from 50 to 100 ns and average power 1 to 1000W whereby the mated area with one shot is from 0.5 to 2 cm.sup.2. The apparatus has a base with an upright on which are fastened parallel elements and a screw that is seated in its upper end in a thrust element and at its lower end is linked by an articulation to an electric motor. The screw drives a fork guided on the parallel elements. A slide is fastened to the fork and has longitudinal channels and a plate for inclination at increments of 15.degree.. To this slide is fastened a second electric motor and on its axis is mounted a carrier on which is fastened a mask in which is fixed the article to be decorated. On the rotating bearer a disk can be fastened on which are mounted four spokes with four springs and a repleceable stand.
Abstract translation:通过具有脉冲能量1至5J的CO2激光器在(RP TEA)的大气压下重复脉冲放电,在1x106W / cm 2至6×10 7 W / cm 2的操作功率密度,50至100ns的脉冲持续时间和平均功率 1〜1000W,一次注射的配合面积为0.5〜2cm 2。 该装置具有一个具有直立的基座,在该基座上紧固着平行的元件,并且在其上端位于推力元件中并且其下端通过铰接连接到电动马达的螺钉。 螺丝驱动在平行元件上引导的叉子。 滑块固定在叉子上,并具有纵向通道和倾斜角度为15°的倾斜板。 在该滑块上固定有第二电动机,并且在其轴上安装有承载件,在其上固定有待固定待装饰物品的面罩。 在旋转载体上,可以将一个盘固定在其上,四个辐条装有四个弹簧和一个可折叠的支架。
Abstract:
The efficiency of laser welding and other laser material processing is optimized according to this invention by rotating the plane of polarization of a linearly polarized laser beam in relation to a work piece of the material being processed simultaneously and in synchronization with steering the laser beam over the work piece so as to keep the plane of polarization parallel to either the plane of incidence or the direction of travel of the beam in relation to the work piece. Also, depending to some extent on the particular processing being accomplished, such as welding or fusing, the angle of incidence of the laser beam on the work piece is kept at or near the polarizing or Brewster's angle. The combination of maintaining the plane of polarization parallel to plane of incidence while also maintaining the angle of incidence at or near the polarizing or Brewster's angle results in only minimal, if any, reflection losses during laser welding. Also, coordinating rotation of the plane of polarization with the translation or steering of a work piece under a laser cutting beam maximizes efficiency and kerf geometry, regardless of the direction of cut.