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A novel approach named off spindle axis OSA spiral grinding for fabricating aspheric microlens array AMLA mold inserts for precision glass molding PGM is presented In OSA spiral grinding three translational motions of the grinding wheel are synchronized with the rotation of the workpiece to form a local spiral wheel path for individual lens letsJan 19 32 These start with the traditional grinding process that makes many spherical lenses at the same time then an additional grinding process on a setup that looks rather like a lathe to correct the shape to an aspheric profile one lens at a time Upside You can use any glass you want and make any shape you want even on large lens elements
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For generating the aspheric surface Vertex counts on the OptiPro eSX 150 CNC optical grinding machine With 5 axes of computer controlled motion and generous machine travels Vertex is able to generate rough and fine grind surfaces for aspheres up to 150mm in diameterTherefore it is most important to achieve the same local removal depth over all points on the aspheric surface in the polishing process which improves the surface roughness Although the aspheric surface micro lens machining has been studied ultra precise grinding of aspheric or
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A novel approach named off spindle axis OSA spiral grinding for fabricating aspheric microlens array AMLA mold inserts for precision glass molding PGM is presented In OSA spiral grinding three translational motions of the grinding wheel are synchronized with the rotation of the workpiece to form a local spiral wheel path for individual lens letsLarge aperture aspheric optics are among the most susceptible optical surfaces to the accumulation of periodic surface artifacts during fabrication Periodic features are created during the manufacturing process and lead to significant degradation in imaging performance
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Precision polishing of aspheric lens Grinding and polishing one aspheric lens at a time has been the standard manufacturing technique but technological advances now allow for previously unattainable levels of accuracy Computer controlled precision polishing can automatically adjust tool dwell parameters to polish away high spots where more polishing is neededall the time in a closed loop process In the first step an aspheric contour is ground into a spherical blank Owing to high material removal the grinding process is much faster than the following polishing Thus the shape of the lens which is closer to the finally desired shape after grinding reduces the polishing time ie lowers produc
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22 Grinding Process The standard grinding process developed for this machine is a two step sequence that uses a 10 20 181 m diamond bronze bond tool for the roughing cut and a 2 4 181 m diamond resin bond tool for the finishing cut Table 1 presents the typical process parameters used Table 1 Grinding tool specifications and process parametersTo enhance the precision and productivity of ultra precision aspheric surface micro lens we present an ultra precision grinding system and process for the aspheric surface micro lens In this
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on specific glass types such is the process related nature of grinding View of a typical aspheric grinding process and resulting figure accuracy Freeform Geometry A common limitation of the previously mentioned single point diamond turning and grinding machines is their inherent ability to generate only rotationally symmetrical surfacRough grinding cutting process the process of making a part have basically accurate geometry and size Fine grinding rough grinding procedure to prepare the parts to the specified dimensions and requirements Polishing fine grinding process it is to make the surface of the part bright and achieve the required optical precision
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micro diamond wheels but require additional finishing process as the size of the dies and molds become smaller and the required accuracy becomes higher In order to finish micro aspheric dies and molds with diameter less than 3mm an ultrasonic vibration assisted polishing machine is developed A Edmund Optics ’ high volume aspheric lens manufacturing cell operates 24 hours a day to produce thousands of precision aspheric lenses per month Our manufacturing cells feature state of the art production and metrology equipment which complements our expert knowledge in aspheric lens design and manufacturing
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The shape size and material of grinding tool not only affect the machining accuracy but also the machining efficiency in the process of Computer Controlled Grinding The hardness of the SiC aspheric mirror the misfit of grinding tool and the work piece also emphasize the importance of grinding Dec 13 32 The MarSurf LD 130 and 260 Aspheric facilitate the multiset grinding and polishing manufacturing process for high precision optics by providing fast accurate 2D and 3D measurements for the evaluation of contour and surface topography
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PDF In the manufacturing process of aspheric glass lenses the polishing step plays a key role with respect to the final quality of the lens as well as to the manufacturing costs Due to the Aspheric surfaces are powerful tools that combine the optical corrections of multiple lenses into a single element Figure 1 and affect performance i The optical process following grinding that puts a highly finished smooth and apparently amorphous surface on a lens or a mirror
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specially designed an evolutionary grinding process for the fabrication of aspheric surfaces of a glass ceramic substrate 9 Kim et al developed a new sub micron control algorithm in order to interpolate tool path in grinding and polishing aspheric surfaces 10 In the grinding process of the aspheric surfaces the rotational workpiece is ground along the grinding curve from the center to the edge of the workpiece by the arc shaped rotational grinding wheel as is shown in Figure 1 The aspheric surface is formed by the osculatory abrasive grains of the wheel
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OPTI 521 Tutorial Chia Ling Li /12/2 1 Introduction specification the aspheric element has to pass a third process step local correction Residual surface Integration of grinding process and metrology 1 Design Fabrication and Testing of Aspheric surfaces P 8Cross and parallel grinding modes are two typical general grinding modes for aspheric surface in vertical wheel spindle grinding system In this paper roughness surface profile form accuracy and wheel wear of the ground aspheric surface utilizing the cross and parallel grinding methods are compared and investigated
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In order to do the precision grinding of optical aspheric lens it is essential to achieve high quality surface roughness Experiments show that the contacting area between the wheel and workpiece in a grinding process is critical to influence the surface roughness for a fine grit size resin bonded wheel The precision grinding are performed with BK7 optical lensIn order to obtain form deviations of a few hundred nanometers and below the production machines have to be corrected all the time in a closed loop process In the first step an aspheric contour is ground into a spherical blank Owing to high material removal the grinding process
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