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Volume 24, Issue 4
Displaying 1-10 of 10 articles from this issue
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Hideo KODAMA1996 Volume 24 Issue 4 Pages 441-442
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (113K) -
Takeo NAKAGAWA1996 Volume 24 Issue 4 Pages 443-451
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe layered manufacturing was developed about 10 years ago as a new manufacturing process of mechanical parts directly from 3D CAD data, and is now called rapid prototyping. Recent applications of this process are reviewed briefly in this paper. Most of the rapid prototypings are used in industry for the verification of CAD design and the functional checking of machine parts at the developmental stage of new products. Various new types of rapid prototyping machines, some of which are suitable for metal and ceramics, have been developed, thus broadening the application field. There are strong needs for the application to die and mold manufacturing, for production of medical parts and micro machine parts in the future.View full abstractDownload PDF (838K) -
Eijiro TAGAMI1996 Volume 24 Issue 4 Pages 452-459
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe method of photofabrication (stereolithography) which is fabricated plastic models using laser and photocurable resin from 3-D CAD data by layer by layer is one of the rapid plototyping technology. The principle, the detail explanation of apparatus and the applications of the method of photofabrication are descrived.View full abstractDownload PDF (963K) -
Yoshiyuki KAWAMURA1996 Volume 24 Issue 4 Pages 460-466
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSCombination of laser machining and conventional mechanical lathe machining provides a new technique for machining of three dimensional microstructure. We have developed such a technique, in which rotating works are irradiated with focused laser pulses. The laser operation is controlled with a personal computer, to which the data of final machined shapes and programs for the machining process are installed. It is demonstrated that the machining of an arbitrary three-dimensional micro structure having a typical dimenssion of less than 1 mm is possible by using this new technique.View full abstractDownload PDF (1027K) -
Yoji MARUTANI1996 Volume 24 Issue 4 Pages 467-474
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSMuch attention is recently paid to the new laser fabrication technology for providing steric objects automatically. It is called “rapid prototyping(R/P)”, and has started using a UV laser and photopolymer. Now the plastic models made by R/P are applied in many fields. After the success of the photopolymer method, the development of R/P to make metal parts has been requested by the industries, because many products are composed of metals. Many researches have been done to put the technologies for the generation of steric metal parts in practical use. In this paper, the latest researches of making metal parts, molds and tools are shown.View full abstractDownload PDF (1451K) -
Sadahiko NAGAE1996 Volume 24 Issue 4 Pages 475-485
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThis paper presents an overview of a newly developed 3-D Laser Beam Measuring System which was used to make several chinawares. The present implementation of the system consists of not only measuring the outline shape but also making three modules, that is an interactive surface modeller, a shading image generation module and a 2-D paint software. Chinaware objects are created by using the interactive surface modeller by the design stage. A designer inputs several surface detail parameters of the object, such as material, color, etc. As a result, the designer can get a sophisticated shaded image on a CRT display. The system operates on a personal computer coupled with a color display which has 24 bit-planes per pixel, and can present realistic images of chinawares.View full abstractDownload PDF (2764K) -
Hajime HATTORI, Takashi TAKEO, Ryunosuke YAGI, Yoshiyuki UCHIDA1996 Volume 24 Issue 4 Pages 486-490
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA method of stereolithography is proposed and basic experimental results are presented. The method employs real-image producing technique by holography and a photo-curable resin. The real images reconstructed by reverse illumination of Fresnel holograms or holographic stereograms were immersed into a photo curable resin stepwise in the vertical direction in order to solidify a three-dimensional object. When the Fresnel hologram was employed, the resin was actually cured to produce an object similar to the original one. On the other hand, although the real image can be recognized visually, the photo solidification modeling of an object, which was computer-generated, was not feasible in the case of the holographic stereogram because of low light power intensities.View full abstractDownload PDF (986K) -
Korenori TAMURA, Hideki TAKEDA, Fumihiko KANNARI1996 Volume 24 Issue 4 Pages 491-498
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSBroad-band vacuum ultraviolet fluorescence has been observed in Nd3+-doped LaF3 excited with an F2 laser (157 nm). Although a theoretical estimation predicted a substantial small signal gain at 172 nm, the fluorescence intensity measured as a function of excitation power or excitation length indicated no positive net gain. We found an extremely large transient absorption in the visible wavelength region, which is presumably caused by color-centers and prevents laser oscillation in the vacuum ultraviolet region.View full abstractDownload PDF (990K) -
Toshiyuki SAITO, Akio NISHIMOTO, Motoi NANJO1996 Volume 24 Issue 4 Pages 499-506
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSTo understand the ecosystem of lakes and the ocean, we have developed a new in situ measurement system for counting and sizing alga particles. The system is based on the fact that the laser induced fluorescence from the phytoplankton changes its spectrum according to the phycocyanin quantity which is abundant in blue-green algae. In the system, blue-green algae are discriminated by measuring the ratio of fluorescence components at the two wavelengths (655 nm and 685 nm) emitted from the phytoplankton irradiated with a 532 nm laser beam. The system gives particle size distribution for each alga in the mixed phytoplankton of blue-green and green algae.View full abstractDownload PDF (1095K) -
Yoshio NISHIDA, Masanobu YAMANAKA, Yasukazu IZAWA, Sadao NAKAI1996 Volume 24 Issue 4 Pages 507-512
Published: April 30, 1996
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSGrowth experiments of Sprouting Radish were carried out for the first time by using a red laser diode (LD) and two blue light emitting diodes (LED) as the light source for the photosynthesis. The output power and the central wavelength of the LD are 5 mW and 670 nm, and those of the LED are 1.2 mW and 450 nm, respectively. The type of the LD is selected so that the central wavelength of the LD matches to the band center of the absorption spectrum of the plant. It is found that the plant under the artificial light grows similarly to that under sunlight.View full abstractDownload PDF (1093K)
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