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33results about How to "Uniformity is maximised" patented technology

Fault-tolerant clock synchronisation

A clock synchronization method is described for a system including N clocks, at least three and at most N−1 of which are master candidate clocks. A start message is broadcast from the fastest master candidate clock. From each of the master candidate clocks, a response message including the local time of receipt of the start message according to the clock in question is broadcast. Using the information representing the times of receipt of the start message, the median master candidate clock is selected and becomes the master clock. The master clock determines the clock synchronisation error for each master candidate clock, using the information representing the times of receipt of the start message. If any such clock synchronisation error is excessive the master clock declassifies the clock in question as a master candidate clock and classifies another clock as a master candidate clock. This is achieved by broadcasting a classification message identifying which of the N clocks are to be classified as master candidate clocks. Next, the master clock broadcasts a synchronisation message including the local time of receipt of the classification message according to the master clock. Each of the other N−1 clocks is then synchronised with the master clock using that information and the local time of receipt of the classification message according to the clock in question.
Owner:DEPENDABLE REAL TIME SYST

Precise fabrication of polymer microlens arrays

High performance microlens arrays are fabricated by (i) depositing liquid on the hydrophilic domains of substrates of patterned wettability by either (a) condensing liquid on the domains or (b) withdrawing the substrate from a liquid solution and (ii) optionally curing the liquid to form solid microlenses. The f-number (f#) of formed microlenses is controlled by adjusting liquid viscosity, surface tension, density, and index of refraction, as well as the surface free energies of the hydrophobic and hydrophilic areas. The f-number of formed microlenses is also adjustable by controlling substrate dipping angle and withdrawal speed, the array fill factor and the number of dip coats used. At an optimum withdrawal speed f# is minimized and array uniformity is maximized. At this optimum, arrays of f / 3.48 microlenses were fabricated using one dip-coat with uniformity better than Δf / f˜±3.8% while multiple dip-coats permit production of f / 1.38 microlens arrays and uniformity better than Δf / f˜±5.9%. Average f#s are reproducible to within 3.5%. The method is adaptable and extendible to precision parallel fabrication of (i) microlenses precisely sized, aligned and spatially positioned to various small light sources and optical fiber ends, (ii) conductive bump bonds on substrate pads, and (iii) conductive bonds between corresponding domains on separate perpendicular substrates, all of which are self-aligned.
Owner:RGT UNIV OF CALIFORNIA
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