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Hiroki YOSHINO, Masahiro OHKA, Tetsu MIYAOKA
Article type: Article
Session ID: 5529
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In order to enhance capability of the man-machine interface, we are attempting to investigate the influence of the proprioception, and to clarify cooperated processing with the cutaneous sensation. We performed a series of experiments based on psychophysics, in which we adopted a circle and eight kinds of oval as stimuli. The diameter of circle is 10mm, and minor axes of eight kinds of oval are decreased in 3% step from circle. And we have equally adjusted the oval area to equal the circle area. Subject judged which stimulus presented on right or left panel equals the circle. The experiment conducted on both of the fingertip and the thenar. We compared result obtained by thenar and calculated result based on density of mechanoreceptive unit distributed over the thenar. As a result, the characteristics of the thenar are different from that of the fingertip, and it was suggested that at least two systems seem to act on the thenar.
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Makoto HARIU, Hirofumi NESORI, Mami TANAKA, Yoshikatsu TANAHASHI, Seij ...
Article type: Article
Session ID: 5530
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This Paper is a study on the development of an active palpation sensor that is wearable on a doctor's finger and can compensate the force to press against prostate for detecting prostate cancer and hypertrophy. The receptor of the sensor is a polyvinylidene fluoride (PVDF) film. A strain gauge that is used to detect the force is attached to a metal base. This sensor section is set in a finger stall in order to take stable contact between a user's finger and the sensor. The sensor is pressed against the prostate gland and driven sinusoidally with a constant amplitude vibration. For convenience, the structure is made up of two parts: sensor and vibro-machine. The sensor is worn on a doctor's finger tip and a vibro-machine is fixed at his finger root. With this structure, the doctor can move his finger freely. The results showed that the output of the sensor varies with the stiffness of prostate glands and the sensor is effective in diagnosing the condition of prostate glands.
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Shunsuke HATTORI, Yasuo SHIMA
Article type: Article
Session ID: 5601
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Recently, in the paper feed equipment (printer, copier, ATM, and OCR, etc.), higher fundamentality performance is demanded from the change in the market such as diversification of a medium, expansion of a use. In such an equipment, performance of mechanism to take out one piece of medium is the most important. And "Paper-loosening" to make it easy to take out a medium beforehand has a big influence on a performance margin. In this report, I pay attention to this "Paper-loosening". And I analyze the effect and influence to act on a medium.
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Hiromu HASHIMOTO, Chihiro KONDO
Article type: Article
Session ID: 5602
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In the web transport processes, the material is driven through traction generated at interface web and rotating roller. The traction inevitably falls as transport velocity increases due to an air entrainment, and is accompanied by onset of slippage. As a result, the traction sometimes limits the productivity. The loss of traction also causes web lateral motion and slippage when the lateral force is grater than the available friction force. Therefore, an understanding of traction between web and roller and prediction model of slippage onset condition, are clearly desirable. This paper describes the theoretical model for predicting the slippage onset condition between paper web and steel roller with experimental verifications .
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Hiromu HASHIMOTO, Shigeyoshi KIRIBE, Hiroto KAWANISHI
Article type: Article
Session ID: 5603
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes the measurements of traction coefficient between web and steel roller under various operation conditions. The web such as uncoated paper (newsprint) is used as test webs. In the measurements, the web is wrapped over the rotating roller with the surface velocities from 0 to 40m/s. The web tension is applied by the weight at the edge of web and the traction force between web and roller is measured by the load-cell at the other edge of the web. The traction coefficients are, then, obtained based on the Euler's belt theory. Humidity is changed as operation parameters. From the measured results, the effects of such various operation parameters on the traction coefficient between web and roller are clarified.
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Shigeo YANABE, Daisuke HAYASHI
Article type: Article
Session ID: 5604
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Motion of a pinching belt transfer system used in automated post classification machines or automated ticket gates is simulated by a FEM soft ware and velocity characteristics of belts and a transferred medium against a belt-roller lift are investigated. The treated system is composed of two sets of a belt-roller system, which has two rollers and a belt. The results show that the velocity of the drive (driven) side belt does not change (changes largely and approaches a certain value) as the lift increases. The velocity of the driven side belt largely depends on its radius wrapping around the specific roller. The velocity of the medium is close to the mean velocity of the two belts.
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Yusuke HIRABAYASHI, Hiroshi YAMAURA, Mamoru KIDO, Koji UDAGAWA
Article type: Article
Session ID: 5605
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes basic study on the dynamic behavior of a sheet of paper that moves near a guide plate in a feeding path in the air. Because pneumatic pressure around paper significantly affects dynamic behavior of the paper placed near the guide plate, a numerical program that solves unsteady flow of noncompressible fluid governed by Navier-Stokes equation with the Finite Element Method and calculates the pressure and velocity of the surrounding air of moving paper was firstly developed. In order to verify the validity of the developed calculation program, a simple case where a horizontal plate vibrates near a horizontal guide in the vertical direction was assumed. An experimental apparatus consists of a plate driven by a voice coil motor, a guide plate with a pressure sensor was prepared. It was shown that the calculation results agree well with the experimental ones.
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Yoichiro IIZUKA, Hiroshi YAMAURA
Article type: Article
Session ID: 5606
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper discusses lateral paper motion characteristics of a paper transfer mechanism. In this paper, the lateral paper motion characteristics of a paper transfer mechanism is investigated experimentally with an experimental setup consists of a long rubber-layerd roller and a steel roller. Rubber thickness, steel-roller skew angle and load weight are changed in experiments. The experimental result showed that the skew of steel roller doesn't cause in-plane rotation of the paper but lateral paper motion, and the paper is almost fed in the feeding direction of the steel roller.
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Minoru KASAMA, Masatsugu YOSHIZAWA, Tomoyuki ITOH, Yimei YU, Yoshiaki ...
Article type: Article
Session ID: 5607
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper discusses oscillation mechanism of a cleaning blade in a laser printer. Although this problem has been known for many years, the details of oscillation mechanism is not clarified, so we have not found out the fundamental solution yet. In order to clarify the mechanism, we direct our attention to a coupled-mode flutter model in multi degrees of freedom system, and then we formulate an equation of motion. Then, we verify a stability of the system and formulate equation of steady-state amplitude of unstable vibration due to a coupled mode flutter by nonlinear analysis of the system. Finally, we reveal a validity of our study by a comparison between an experiment and a numerical simulation of some modified blades.
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Yuichiro SANO, Toru MIYASAKA
Article type: Article
Session ID: 5608
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In the application of electro-photography used for copiers, etc., we examined the technology of formed metallic wiring patterns created on-demand with high speed and accuracy. In patterning metallic wiring by electro-photography, the electrification of metallic particles and the conductive wiring by low temperature heating are problems. We examined a method of direct patterning of silver nano-particles by liquid development and baking at about 200℃. As a result, we confirmed the formation and transcription of a fine metallic wiring pattern with a width of 10μm.
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Kiminori TOYA, Yuko KOBAYASHI
Article type: Article
Session ID: 5609
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In a flat belt transport system, it is known that the belt mistracking occurs as a consequence of the roller's misalignment. Crown-face roller makes belt drive near the center stable. So the mistracked belt stops at a constant position where it balances, and the mistracked amount is decided in each case of misalignment. We analyzed the relationship between the roller's misalignment and the belt mistracking. As a result, we have formulated an experimental relational expression describing the belt's mistracked amount, which consists of some parameters such as the roller's misalignment and the belt expansion rate. We also clarified that the mistracked amount does not increase at high transport speed.
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Yuko KOBAYASHI, Kiminori TOYA
Article type: Article
Session ID: 5610
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Rubber rollers and conveyor belts transport flexible sheet-type media. With high-speed belt transporting systems such as mail sorters, demand for an increase in speed may cause the belt to come off. Therefore, we have examined the effects of belt transport speed and other factors that may cause belt mistracking for a basic belt conveyor system, consisting of one flat belt and two crown-face rollers. Simulation was conducted using commercial motion system analysis software. The qualitative tendencies of the belt mistracking from simulation and experiment were in good agreement and factorial effects were clarified for ten parameters. As for transport speed, a speed increase did not enlarge belt mistracking. This tendency was explained by applying the cornering force of automotive engineering. Quantitatively, when axial load on rollers and other parameters were made equal, the belt mistracking according to simulation was generally in agreement with the experimental value.
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Yasuhiro YOKOTA, Masaki TAKAHASHI
Article type: Article
Session ID: 5611
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Wide film belt is used in electrophotographic copier, printer as intermediate transfer belt. The characteristic of the belt is that (1) the belt is thin and flat, (2) pullys is flat cylindrical rollers. Recently, the printer requires higher moving performance with the belt. In this paper, we report the experimental and calculation (FEM) results of skew on wide film belt running between two flat cylindrical rollers. The results show that (1) skew velocity is proportional to misalignment angle with driven roller, (2) the calculation results of the skew velocity is consistent with the experimental results.
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Kazushi YOSHIDA, Hui CHENG
Article type: Article
Session ID: 5612
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We investigated the centering behavior of an elastic flat belt running on a crowning roller by using beam theory. To understand the centering behavior, we developed an analysis method that can predict the deformation and shifting of a belt using beam theory. The calculated results of deformation and shifting correlated well with the experimental results even when the parameters of the crowning roller changed. Our developed analysis method showed that the centering behavior of the elastic belt caused by bending moment that was generated by the difference of the radius of the crowning roller.
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Kazuki INADA, Shinsuke KUNITOMI, Hiroshige MATUOKA, Shigehisa FUKUI
Article type: Article
Session ID: 5710
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Characteristics of the force curve of a liquid meniscus bridge were experimentally investigated using a menisucus response apparatus that the authors developed. The force curves for relatively small or large contact angles were obtained. Difference between the maximum meniscus forces of the approach process and that of the release process was found and the hysteresis was observed. It was found that these phenomenon could be understood by considering the advancing and receding contact angles.
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Syunsuke MORITA, Kazuki INADA, Hirosige MATSUOKA, Shigehisa FUKUI
Article type: Article
Session ID: 5711
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The atomic force microscope (AFM) is a powerful and widely used tool for investigating micro/nano properties of surfaces. The force curve is generally used for measuring the surface interaction forces in AFM. In this study, dependence of force curve on relative humidity was investigated experimentally using the AFM in the environment-controlled chamber. It was found that the water meniscus bridge would be formed due to the capillary condensation of water vaper in the air when the relative humidity is higher than 70%.
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Masayuki Watanabe, Yasuji OHSHIMA, Hedong ZHANG, Kenji FUKUZAWA, Yasun ...
Article type: Article
Session ID: 5712
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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The elongation and adhesive force exerted by nano-bridging of lubricants formed between the diamond tip and the disk surface coated with molecularly thin lubricants were measured. These were accomplished by a micro probe of SPM withdrawing from the disk surface. Three different kinds of PFPE lubricants (polar Zdol2000, polar Zdol4000 and nonpolar Z03) were selected with a varying film thickness from monolayer to trilayer (2-9nm). It was clarified that the elongation decreases monotonously with film thickness both for the polar and nonpolar lubricants, and it is longer for the nonploar lubricant. Also, it was found that the adhesive force decreases monotonously for the polar lubricant, while it increases at a 2.5nm thick film for the nonpolar lubricant, and it is stronger for the nonpolar lubricant. These differences were considered to be generated by the lubricant fluidity and the meniscus force.
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Soichi SHIMIZU, Shinji WAKIMOTO, Kiyomi YAMANE, Hiroshige MATSUOKA, Sh ...
Article type: Article
Session ID: 5713
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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To examine behaviors and instabilities of ultra-thin but continuum liquid films, the long wave theory was employed, which is the time-evolution equation for the shape of the thin liquid film and includes surface tensions and surface forces such as the van der Waals (vdW) forces. The lubricant becomes dynamically unstable due to the attractive force from the upper solid or repulsive force of polar component. In this report, the time-evolution of the surface rise to the upper solid for non-polar liquid and the deformation from the liquid step to a terrace shape for polar liquid were numerically analyzed.
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Yuki KUDO, Hedong ZHANG, Yasunaga MITSUYA, Kenji FUKUZAWA
Article type: Article
Session ID: 5714
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We have evaluated the effects of ultraviolet (UV) irradiation on spreading characteristics of three different kinds of PFPE lubricants (UV sensitive AM3001, polar Zdol200, and nonpolar Z03) coated over magnetic disks. This was accomplished by comparing the spreadings of irradiated and non-irradiated lubricant films around the step-shaped lubricant/disk boundary (step boundary flow), and by comparing the spreading over lubricant surface around the boundary between irradiated and non-irradiated lubricant films (UV-induced flow). We found that UV irradiation significantly affects the UV sensitive lubricant but hardly affects the nonpolar lubricant in term of the UV-induced flow, and it noticeably affects the nonpolar lubricant but hardly affects the polar lubricant in term of the step-boundary flow.
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Norio TAGAWA, Daisuke TANAKA, Atsunobu MORI
Article type: Article
Session ID: 5715
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In order to achieve a magnetic recording density of 1 Tb/in^2, the spacing is expected to be less than 2-3nm. However, a critical issue in achieving such an ultra-low spacing is the dynamic instability of the head disk interface (HDI).The goal of this research is to clarify the effects of the lubricant materials on slider hysteresis behavior in detail. In this study, the difference in the touchdown velocities was monitored by varying the lubricant film materials of the disks ; further, the correlation between the observed phenomenon and the variation in the experimental parameters was investigated. Considering the obtained experimental results, it was suggested that the variation in the touchdown velocity is due to a variation in the intermolecular forces.
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Jun-ichi ICHIHARA
Article type: Article
Session ID: 5716
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We have investigated the behavior of a flying head slider of hard disk drives while the ambient pressure changes. We found that the slider motion has a unique response when the ambient pressure changes rapidly through numerical calculations. This phenomenon is peculiar to the case of rapid ambient pressure change and does not occur neither against the disk vibration nor accelerative external disturbance. We made numerical investigation and clarified the slider feature that causes this phenomenon.
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Takayuki KANAMARU, Kiyomi YAMANE, Hiroshige MATSUOKA, Shigehisa FUKUI
Article type: Article
Session ID: 5717
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Recently the spacing between the slider and the disk has been reduced to 10nm or less, and analysis of the slider dynamics becomes increasingly important. To perform this analysis, the highly accurate and numerically stable cubic interpolated propagation (CIP) method was applied to the molecular gas-film lubrication (MGL) equation. It was applied to two-dimensional dynamic pressure analysis of a finite-width slider that has ultra-small spacings by using the molecular gas-film lubrication equation. Dynamic pressures caused by moving single projeciton and running disk with step under a fixed finite-width slider were analyzed by the CIP method and are shown quantitatively.
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Masayuki KURITA, Toshiya SHIRAMATSU, Kouji MIYAKE, Hideaki TANAKA, Mik ...
Article type: Article
Session ID: 5718
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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To achieve an ultra-low flying height in magnetic head sliders for next generation hard disk drives, we are developing an individual and in-situ technique to adjust flying height using a built-in thermal actuator to compensate for flying-height deviations and variations. We have evaluated changes in the flying-height of a prototype slider by observing the amplitude of read back signals. However, the observed flying-height change is much smaller than the predicted value by simulation. To resolve this issue, we optically evaluated the slider's flying height at multiple positions, which revealed a "compensation effect" due to increasing air pressure. That is, the pressure on the air-bearing surface increases as the head protrudes downwards by thermal expansion, which lifts the slider upwards. The evaluation also showed a reduction in the pitch angle due to increasing air pressure.
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Taichi NAKAMURA, Futoshi KITAIZUMI, Hirotaka ANZAI, Tsuyoshi MATSUMOTO
Article type: Article
Session ID: 5719
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Effect of head protrusion is significantly becoming more important as reducing FH and introducing TFC, but there has been no direct measurement at flying state. As for current induced head protrusion, temperature distribution is difference between "Flying state" and "Static state". We need to measure of the protrusion under flying states. We will report direct head protrusion measurement methodology and results by conventional flying height tester (FHT). 3D protrusion map under flying state can be measured with trailing area including element and alumina over coat.
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Koji MIYAKE, Hideaki TANAKA
Article type: Article
Session ID: 5720
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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System to load and unload on data area for increase of the storage capacity is on the way to development. On the other hand, small "femto slider" instead of pico slider has been applied to reduce cost. So it is important to investigated load/unload behavior of femto slider for the development of the system. We measured the load/unload behavior of femto slider by laser doppler vibrometer and compared it with that of pico slider. The evaluation results showed that there was neither slider/dimple separation while unloading femto slider nor pitch vibration after unloading because of small residual negative force. However, even femto slider vibrated due to increase of residual negative force in case Z-height is smaller than nominal.
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Keiko Watanabe
Article type: Article
Session ID: 5721
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper presents an experimental analysis on operational shock response of a hard disk drive. Simultaneous measurements using multiple laser doppler vibrometers and a high-speed camera clarified actual responses of a disk, a suspension, and head slider during operational shock, and found that, in the case of 0.5ms half-sine shock, beating vibration of the suspension was generated and caused the head slider jump after the shock pulse. Moreover, experimental modal analysis showed that B1-mode of the actuator was separated into two peaks in the frequency response of the suspension. The convolution integral of the frequency response indicated that decreasing difference between the two B1-mode frequencies could reduce the beating vibration and improve the shock resistance property of the drive.
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Hidehisa SAKAI, Tadashi TATENO, Toshiyuki NAKADA, Kenichirou AOKI, Tos ...
Article type: Article
Session ID: 5722
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In recent years, the demand for the impact simulation is highly required for electronic equipments such as a cellular phone and a note PC. However, there are not so much verification data for such dynamic impact simulation. Therefore, authors evaluate the benchmark simulation model for the dynamic impact analysis with contact in two objects. Simulation results of some commercial FEM structure analysis solvers and experimental results are verified for the benchmark model in this research.
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Akira Sakurada, Masato Furuya, Shigeki Mori, Akihiro Naganawa, Yotsugi ...
Article type: Article
Session ID: 5723
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Our proposed nano-motion actuator (NMA) was applied for a high speed and precise spin-stand tester which evaluated high areal density magnetic recording. Since, the NMA characteristic was a second order lag element that had large amplitude at a resonance frequency, a mechanical damper should be indispensable with keeping control performance. Although the damper worked effectively for the NMA, its mechanism was not solved yet. In the paper, we approach to analyze the damper mechanism from its frequency response which is a damping coefficient depending on velocity (angular frequency).
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Shigeo Nakamura, Takeshi Shimano, Irizo Naniwa, No-Cheol Park, Jeongho ...
Article type: Article
Session ID: 5724
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We have fabricated a rotary actuator for a small-form-factor optical disc drive (SFF ODD). The assumed dimensions of the SFF ODD are 36mm in length, 43mm in width, and 5mm in height. This disk diameter is around 28mm. The length of the actuator is around 24mm. The actuator consists of a voice coil motor for head tracking and a solenoid for head focusing. Their coils are built in a swing arm of SUS-Al-SUS laminated material. The actuator was designed to meet tracking and focusing requirements of the SFF ODD. The practicality of the actuator has been demonstrated with a prototype.
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Yuta KAMOSHITA, Hiroshi YAMAURA
Article type: Article
Session ID: 5725
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper discusses experimental study of the force acting on a contact slider of HDD. First, the circumferencial friction force acted on a contact slider by a disk was measured. It was found that the averaged circumferencial friction force could be modeled as Coulomb friction one. Next, the lateral velocity of a simulated contact slider and AE signal were measured, and the off-track force was estimated with frequency response function computed with FEM. As a result, it was found that the glass slider whose roughness was 1.8nm could achieve soft contact, and the off-track force acting on the contact slider was same order to the windage force.
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Takehiko EGUCHI
Article type: Article
Session ID: 5726
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Experiments on disk flutter of hard disk drives with non-uniform gap between disks and a shroud were conducted. In this experiments, polyester tapes were partly attached on the shroud so that the shroud gap was changed along the circumference of the disks. Three non-axisymmetric normal modes of the disk were measured, and these amplitude had extremal values at the circumferential position where the shroud gap was narrowest. These vibration modes should not appear if the shroud gap is uniform. Numerical simulation with non-uniform shroud gap was performed, and normal modes of a rotating disk were computed. The mode shapes of these normal modes well matched those of the measured vibration modes. Therefore, it is thought that mode amplitude at a specified point can be decreased by aerodynamic damping force.
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Satomitsu IMAI
Article type: Article
Session ID: 5727
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper deals with the excitation mechanism of the flow induced disk vibration of HDD on the shroud opening. The flow condition is examined by the tuft method and the pressure sensor. The excitation force is considered to the flow component in the disk perpendicular direction due to the pressure distribution in the shroud opening. There is the relation between the pressure characteristics due to the flow component and the characteristics of the disk vibration. Installing a spoiler is effective to reduce disk vibration and it is confirmed in terms of the pressure characteristics.
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Hiroshi MUKAI, Masato IKEGAWA, Yoshiyuki HIRONO, Masayuki Kaiho, Yukin ...
Article type: Article
Session ID: 5728
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Airflow changes in a hard disk drive (HDD) with a bypass and a spoiler were clarified by particle image velocimetry (PIV). These analyses show that the spoiler decreases the flow velocity near the arm by decreasing average flow velocity between the disks such as diverging the flow into the bypass channel, and by moving the high-speed-flow area toward the inner-radius area of the disks.
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Article type: Appendix
Pages
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Published: September 15, 2006
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