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Influence of Rolling Friction in Linear Ball Guideways on Positioning Accuracy
Toshiharu Tanaka,Kyohei Ikeda,Jiro Otsuka,Ikuro Masuda,Takaaki Oiwa 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.2
Linear ball guideways have been used recently in precision or ultra-precision positioning devices. However, when the inner balls begin to roll or the moving direction reverses, these guideways are subject to rolling friction or nonlinear spring behavior. An ultra-precision device with a linear motor, referred to as a 'tunnel actuator' (TA), has been constructed to measure these phenomena. The application of a TA is beneficial for two reasons: it mostly cancels the attractive magnetic force between the stator and mover (armature), and its magnetic flux leakage is very low. The influence of the nonlinear spring behavior in ball guideways was investigated in this study using the pure driving force from a TA. The equilibrium between the driving force from the TA and the nonlinear spring force provided great accur acy for a positioning stage using a linear ball guideway.
Influence of Rolling Friction in Linear Ball Guideways on Positioning Accuracy
Tanaka, Toshiharu,Ikeda, Kyohei,Otsuka, Jiro,Masuda, Ikuro,Oiwa, Takaaki Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.2
Linear ball guideways have been used recently in precision or ultra-precision positioning devices. However, when the inner balls begin to roll or the moving direction reverses, these guideways are subject to rolling friction or nonlinear spring behavior. An ultra-precision device with a linear motor, referred to as a 'tunnel actuator' (TA), has been constructed to measure these phenomena. The application of a TA is beneficial for two reasons: it mostly cancels the attractive magnetic force between the stator and mover (armature), and its magnetic flux leakage is very low. The influence of the nonlinear spring behavior in ball guideways was investigated in this study using the pure driving force from a TA. The equilibrium between the driving force from the TA and the nonlinear spring force provided great accuracy for a positioning stage using a linear ball guideway.
Toshiharu Tanaka,Takaaki Oiwa,Akira Kotani 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.11
A gear is used not only for power transmission but also in precision positioning. A conventional and general gear has only one degree of freedom motion. Therefore, the case of its use is limited. In this paper, we propose and manufacture an innovative spherical gear. The proposed spherical gear has a multiple degrees of freedom motion. Compared with other spherical gear, the proposed spherical gear does not have complex shape. Moreover, the handle of the proposed spherical gear is similar to that of a spur gear. The experimental apparatus using the spherical gear pair measures a transmission efficiency and an angular backlash between the gears. According to experimental results, the spherical gear teeth could mesh firmly and transmit power at any shaft angle. In addition, the maximum transmission efficiency and the angular backlash become about 87.1% and 16.9 mrad when the shaft angle is 0°, respectively.
Hattori, Shigeki,Kano, Shinya,Azuma, Yasuo,Tanaka, Daisuke,Sakamoto, Masanori,Teranishi, Toshiharu,Majima, Yutaka IOP Pub 2012 Nanotechnology Vol.23 No.18
<P>Coulomb blockade behaviors in individual Au nanoparticles of 2 nm core diameter in double-barrier structures have been studied by means of noncontact atomic force spectroscopy (NC-AFS) at room temperature. The Au nanoparticles with a 1-decanethiol ligand were chemisorbed by 1,10-decanedithiol molecules of a mixed 1-octanethiol/1,10-decanedithiol self-assembled monolayer coated on a Au(111) surface; these particles were observed through NC-AFS. NC-AFS measurements of the cantilever frequency shift–sample voltage (&Dgr;f–V<SUB>S</SUB>) curves were sequentially conducted on three Au nanoparticles under the same experimental conditions; the &Dgr;f–V<SUB>S</SUB> curves were found to deviate from the parabolic (&Dgr;f<SUB>N</SUB>) curve in the cases where no extra charge existed on the Au core. The experimental &Dgr;f<SUB>CB</SUB>(=&Dgr;f − &Dgr;f<SUB>N</SUB>) and &Dgr;f<SUB>CB</SUB>/V curves agree well with the theoretical curves obtained using a golden-rule calculation and the same parabolic parameters. All the results, through NC-AFS, suggest Coulomb blockade behaviors in the Au nanoparticles at room temperature.</P>
Logic Operations of Chemically Assembled Single-Electron Transistor
Maeda, Kosuke,Okabayashi, Norio,Kano, Shinya,Takeshita, Shuhei,Tanaka, Daisuke,Sakamoto, Masanori,Teranishi, Toshiharu,Majima, Yutaka American Chemical Society 2012 ACS NANO Vol.6 No.3
<P>Double-gate single-electron transistors (SETs) were fabricated by chemical assembling using electroless gold-plated nanogap electrodes and chemisorbed chemically synthesized gold nanoparticles. The fabricated SET showed periodic and stable Coulomb oscillations under application of voltages of both gates. The sole SET also exhibited all two-input logic operations?XOR, XNOR, NAND, OR, NOR, and AND?with an on/off ratio of 10<SUP>2</SUP>. This demonstrates the potential of chemical assembling to give highly stable SETs exhibiting all logic operations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-3/nn3003086/production/images/medium/nn-2012-003086_0006.gif'></P>