Junji Sone

Sub-Micrometer Size Structure Fabrication Using a Conductive Polymer

Stereolithography that uses a femtosecond laser was employed as a method for multiphoton-sensitized polymerization. We studied the stereolithography method, which produces duplicate solid shapes corresponding to the trajectory of the laser focus point and can be used to build a three-dimensional (3D) structure using a conductive polymer. To achieve this, we first considered a suitable polymerization condition for line stereolithography. However, this introduced a problem of irregular polymerization. To overcome this, we constructed a support in the polymerized part using a protein material. This method can stabilize polymerization, but it is not suited for building 3D shapes. Therefore, we considered whether heat accumulation causes the irregular polymerization; consequently, the reduction method of the repetition rate of the femtosecond laser was used to reduce the heating process. This method enabled stabilization and building of a 3D shape using photo-polymerization of a conductive polymer.

Annealing Transformation of Diamond-Like Carbon Using Ni Catalyst

We have considered diamond-like carbon (DLC) graphitization by low-temperature annealing with a Ni catalyst, for MEMS usage with thick DLC films. For DLC films, annealing at 350–450 °C was effective for improving the I(D)/I(G) ratio of their Raman spectra, and their surface roughness was unaffected by the annealing temperature.

Mechanical design of multi-finger haptic display allowing changes in contact location

We present a new type of multi-finger haptic display in which finger contact locations can be changed by a simple mechanism. Our mechanism independently represents the force for thumb, index and middle fingers and contact location changing mechanism. We fabricated experimental units using carbon-fibre reinforced composite material. This haptic display can be used with Spidar to easily expand the area of operation.

Feasibility study of a rotational haptic display - rotational action and measuring the rotational moment at the wrist -

We are developing a wearable exoskeleton rotational haptic interface that will fit the human body. First, we developed a force sensor to measure the rotational moment of rotational tasks at the wrist and measured the rotational moment of important tasks. Then, we tried to develop a prototype of the exoskeleton rotational haptic interface.

Fundamental Study for a Graphite-Based Microelectromechanical System

We aimed to develop a process for constructing a carbon-based microelectromechanical system (MEMS). First, we prepared a highly oriented pyrolytic graphite (HOPG) crystal microsheet by exfoliation. We fabricated cantilevers and a double-clamped beam by controlling the thickness of the HOPG microsheet using a MEMS process. Second, we used a graphite sheet with contour line adhesion by metal sputter deposition. Third, we used a highly accurate graphite sheet with face adhesion and laser cutting. The first resonance frequencies were evaluated. We confirmed improvement in Q values to 1/10 level of a quarts vibrator, high performance, and a simple structure.

Photofabrication of Poly(3,4-ethylenedioxythiophene) in Transparent Polymer Sheet

The three-dimensional (3D) microstructures of poly(3,4-ethylenedioxythiophene) [PEDOT] were photofabricated in the transparent polymer sheet by multi-photon sensitized polymerization using a femtosecond laser.

Surface Interpolation Method for Large Non-four-sided Areas including Some Concave Areas.

Three-dimensional surface design of industrial products includes a wide variety of non-four-sided areas. Subdivision methods are widely used to interpolate the surface of these areas. But, smooth surface shape control of multiple surfaces is difficult. We used the trim surface for interpolation of these area, but shape control of the trim surface was also difficult. We have now developed a surface interpolation method for large non-four-sided areas that improves shape controllability by using NBG (NURBS Boundary Gregory) patch. This method classifies non-four-sided areas into five types of convex and concave shapes, and the interpolation manner is determined by shape type. It has been used to improve the surface modeling of industrical products.