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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of Progressive Addition Lenses (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 1048-1053 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Methods on the measurement of progressive addition lenses (PALs) are summarized.Principles and characteristics of several comparatively promising kinds of methods based onComputer-aided Focimeters, optical sampling (Hartmann Testing, Ronchi Inspecting etc.) andMoiré Deflection Technology (MDT) are described. Corresponding typical arrangements of themeasurement devices used in these methods are provided too. After being compared with eachother in their features, their respective advantages and application limitations are analyzed. Also,the new development tendencies of these methods are discussed. Based on foregoing comparisonand analysis, key problems and difficulties on the measurement of progressive addition lenses areput forward. In the end, the future of the inspection of progressive addition lenses is proposed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.1048.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The Process of Interior Progressive Addition Lens (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 1054-1060 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The characteristics of Progressive addition lens (PAL) are described in this paper.Theoretical analysis of advantages of Interior PAL is put forward, and the measurement results ofInterior PAL are given. Theoretical and measurement results are consistent by comparing InteriorPAL and Exterior PAL. Then the working procedures of freeform CNC machine of making InteriorPAL are introduced concisely. Also, the experiments were carried out to analyzing the processingresults in turning and polishing. From the results, it is explicit that the lens’ form accuracy iscontrolled in turning and lens’ better surface finish can be obtained in polishing. The factorsaffecting surface roughness are discussed explicitely based on experiment. The effects of lensmaterial and cutting speed on surface roughness in turning were investigated. The experimental datashow that better surface finish can be obtained by using lens material with higher rigidity and usinghigher cutting speed. Polishing time and pressure influence surface roughness signally in polishing.The reasonable ranges of polishing parameters which could bring about better surface finish areobtained in the experiment. The ranges of polishing time and polishing pressure are 50s—100s and0.3bar—0.6bar (1bar=0.1MPa) respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.1054.pdf
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