Shrink Fitter Research Articles

Development of Multi-Polygon Laser Scanner Using a Shrink Fitter

A multi-polygon laser scanner system has been developed by using a shrink fitter, in order to produce a new laser direct imager having an ultra wide scanning width and high resolution. The shrink fitter is a new machine element which is cylindrical-shaped and made of plastic materials. This is developed to connect the two machine elements that have different thermal expansion coefficients with a shrinkage fit. In this joining method, the optical axes of the lenses coincide with the axis of the lens-barrel. The positioning accuracy of the lenses in the lens-barrel did not change at any temperature since the shrink fitter sufficiently expanded or contracted in the radial direction to compensate the change in interference. Therefore, the beam spot became very fine all over the wide scanning width at elevated temperature. In this study, we applied laser scanner units using the shrink fitter to the multi-polygon system, which arranged these units in a line. The performance of the new laser direct imaging system was confirmed experimentally.

911 微細スポット走査法を用いた赤あざに対する皮膚レーザ治療の研究(J04-3 臨床医歯学における非・低侵襲計測技術の展開(3) 光および超音波による診断・治療技術,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

The aim of laser therapy is to destroy the target cells without harming the surrounding tissue. Current approaches to the treatment of lesions often use the delivery of high energy with larger spot sizes compared to the target size, and sometimes unnecessary laser exposure to the adjacent tissue leads to collateral damage. So, we had developed a new type of laser apparatus with a fine laser spot size. To treat vascular lesions on skin, a KTP laser (CW) and a video camera were used. The developed system equipped with a collecting lens assembled by a shrink fitter can focus the laser beam well over a wide scanning width. As a result of the observation of the blood vessel in mouse's pinna after laser beam irradiation, the laser pinpoint irradiation was proved to be effective in the vascular lesions therapy.

Study of a New Type of Laser Microscope with Wide Field of View Using a Shrink Fitter

A shrink fitter is a ring-shaped new machine element to join mechanical components with different coefficients of thermal expansion. As an application of the shrink fitter several optical lenses were shrink-fitted in a lens-barrel using the shrink fitter. The optical axes of the several lenses in the lens-barrel agreed with each other regardless of changes in room temperature. The scanning lens assembled by the shrink fitter could focus the laser light well even over a wide scanning width. If such a scanning lens was incorporated into a laser microscope, object surfaces could be observed over a wider area, compared with the conventional microscope. In this study we have developed a new type of laser microscope with a field of view of 10 by 8 mm. The pixel number in the laser scanning direction of 10 mm was 20,000 and 16,000 in the perpendicular direction of 8 mm. Thus, one field of view of this laser microscope has 320,000,000 pixels. The observation result of some surfaces by this laser microscope are reported.

Development of the Laser Fine Processing Equipment with Wide Process Area Using a Shrink Fitter Technology

Development of the Laser Fine Processing Equipment with Wide Process Area Using a Shrink Fitter Technology

608 シュリンクフィッタ技術を用いた広領域レーザ微細加工装置の開発(OS11-2 特殊加工,オーガナイズドセッション:11 加工技術の高度化)

608 シュリンクフィッタ技術を用いた広領域レーザ微細加工装置の開発(OS11-2 特殊加工,オーガナイズドセッション:11 加工技術の高度化)

Study of a Laser Material Processing System with a Fine Optical Setup using a Shrink Fitter

In order to realize fine processing with a high precision optical system, we have developed a laser processing system with galvanometer scanners and optical lenses using a shrink fitter. The shrink fitter prevents the misalignment of the lenses at the elevated temperature. Therefore fine laser spots can be obtained over the quite wider scanning width, even at elevated temperatures. We examined the possibility of application to laser processing of this lens system using the shrink fitter.Diameters of the lenses used in this study were 160 mm so that the laser spots could be scanned over the width of 100 mm, in both directions of the X-axis and Y-axis. There was large distortion of the laser beam which was inherent to each lenses and can not be removed by mechanical adjustment So we introduced the formula to correct the beam path using the least square method. Finally, we developed the fine laser processing system using shrink fitter.

Development of Pinpoint Laser Therapy Apparatus by Scanning a Fine Laser Spot (Wide Laser Scanning using the Shrink Fitter Method)

To improve unwanted pigments in the skin laser light is irradiated on the pigmented lesion. Melanin, locally existing in the skin, selectively absorbs the laser light. At the present time, the laser guns used in dermatology are manually operated and their laser spots are as large as 3 to 7 mm in diameter. It is thought that normal tissues, which do not contain melanin so much, are hardly damaged by the laser irradiation. However, in reality terrible burns appear after the laser irradiation even in the normal tissue. We have developed a new type of laser apparatus for removing only the pigmented lesions with laser scanning technology. A fθ lens unit assembled by a shrink fitter can focus the laser beam well over a wide scanning width. The effect of the laser pinpoint irradiation to only the pigmented lesions on the pigmentation therapy was experimentally examined with the developed apparatus. As a result, the pigmented lesions were able to be removed without affecting any damage to the surrounding tissue. Thus, the laser pinpoint irradiation was proved to be effective in the pigmentation therapy.

Development of Laser Therapy Apparatus using Minute Spot Scanning Method

To remove unwanted pigments in the skin laser light is irradiated on the pigmented lesion. Melanin, locally existing in skin, selectively absorbs the laser light. At present, the laser guns used in dermatology are manually operated and their laser spots are as large as 3 to 7 mm in diameter. It is thought that normal tissues, which don't contain melanin so much, are hardly damaged by the laser irradiation. But in reality, terrible burns appear after laser irradiation even in the normal tissue. We have developed a new type of laser apparatus for removing pigmented lesions with laser focusing and laser scanning technology. The fΘlens unit assembled by a shrink fitter can focus the laser beam well over a wide scanning width. Thus, the intensity of the focused laser beam became high enough even with a low-power laser oscillator. The focused laser irradiation lead also to another advantage. The cooling rate of the lesion, whose temperature rises over a given point by the focused laser beam, was increased. The effect of the focused laser irradiation on the pigmentation therapy was experimentally examined with the developed apparatus.

2919 シュリンクフィッタを用いたあざ・ほくろ用レーザ治療装置の試作(S64-2 トライボロジーの基礎と応用(2),S64 トライボロジーの基礎と応用)

Principles of laser therapy in dermatology are that laser light of a specific wavelength, which is optimally absorbed by the target tissue, is given to the lesion area to increase tissue temperature and damage the target tissue. At present there are a lot of apparatuses of hand peace type and the their spot diameters are as large as 3〜7mm in diameter. When the laser beam is irradiated to a wide area, it is thought that normal tissues which don't contain the melanins are hardly damaged by the laser irradiation. But in reality the terrible burn appears in the normal tissues after the laser irradiation. To solve these problems, we have developed new type of laser therapy apparatus with laser focusing and laser scanning technology using the shrink fitter. The effects of a focused laser irradiation with this apparatus on the lesion tissue were examined.

708 シュリンクフィッタを用いたレーザスキャナの光軸方向の温度補償(OS8-2 接触問題,オーガナイズドセッション8 機械要素とトライボロジー)

708 シュリンクフィッタを用いたレーザスキャナの光軸方向の温度補償(OS8-2 接触問題,オーガナイズドセッション8 機械要素とトライボロジー)

シュリンクフィッタを用いた3Dレーザスキャナーの解像度に及ぼす温度変化の影響(OS9-4 表面・接触問題)

シュリンクフィッタを用いた3Dレーザスキャナーの解像度に及ぼす温度変化の影響(OS9-4 表面・接触問題)

3Dレーザスキャナの開発 : 基本性能の評価(S51-3 トライボロジーの基礎と応用(III),S51 トライボロジーの基礎と応用)

We have developed a new type of laser imager with a wide field of view of 10mm in width. In a previous paper the spot sizes of the scanning laser on the image plane were investigated at various temperatures to check the performance of the shrink fitter. The resolution of the laser imager was also examined by observing a test chart over a whole scanning width. In this paper a microprocessor was observed with the 3D laser imager over the wide scanning width of 10 mm to investigate its basic performance as a laser scanner. The image obtained at the center of the scanning width was quite clear. The images did not deteriorate even at the both ends of the scanning width.

Effect of Interference on Scanning Performance of fθ Lens Fixed by a Shrink Fitter

An ultra-precise method of joining optical lenses in a housing by a shrinkage fit has been developed using a shrink fitter, which is a cylindrically shaped machine element made of a plastic material. In this method, the form error of the shrink fitter increased the interference of shrinkage fit which caused a lens deformation much greater than the limitation of surface irregularity of λ/2. With an fθ lens unit of the laser scanner, this lens deformation may deteriorate the laser beam spots on an image plane. Therefore, the shrink fitter is carefully and precisely turned, however this takes time and costs money. This is a contact problem between the optical lenses and the shrink fitter. In this paper, to determine limit interferences of the shrink fitter, the effect of the interference of the shrinkage fit on the scanning performance was examined through computer simulation.

2918 シュリンクフィッタ使った大口径走査レンズによるレーザ加工装置の開発

Laser beam machining has mainly been applied to the rough processing like the cutting of the metal sheet. At present, the application is also examined to minute parts such as electronic equipment and communication equipment, and the development of the minute and high-precise processing technology by the laser processing has been challenged. However, the technology of the laser processing which can process the wide area at high speed has not yet been established. In this study, such high-speed, wide and high-precise laser beam processing system was developed by using the large fθ lens system assembled by the shrink fitter and the galvano motors which can be scanned in the biaxial directions.

106 シュリンクフィッタを用いた広視野 3D レーザスキャナーの基礎研究

106 シュリンクフィッタを用いた広視野 3D レーザスキャナーの基礎研究

106 シュリンクフィッタを用いた光学レンズの簡易組込方法

106 シュリンクフィッタを用いた光学レンズの簡易組込方法

2452 シュリンクフィッタ接合法におけるレンズの位置決めと球面変形が光学性能に及ぼす影響

2452 シュリンクフィッタ接合法におけるレンズの位置決めと球面変形が光学性能に及ぼす影響

2411 スキャナーレンズ組込用シュリンクフィッタの寸法公差の緩和

2411 スキャナーレンズ組込用シュリンクフィッタの寸法公差の緩和

New Joining Method For Laser Scanner Lenses By Using A Shrink Fitter

New Joining Method For Laser Scanner Lenses By Using A Shrink Fitter

Effect of a Shrink Fitter on Load-Carrying Capasity of a Ceramic Bearing at Elevated Temperature.

When the ceramic bearing is used under the high temperature environment, the problem occurs. An interference changes because the coefficient of thermal expansion is greatly different between the steel and the ceramic. It is thought that this causes the adverse effect for a load carrying capacity of the ceramic bearing. In this paper, we have applied the shrink fitter to an assembly of the ceramic bearing to prevent the change in the interference. The outer races were broken at the load of 4410N when the shrink fitter was not used. With the shrink fitter the load carrying capacity was 8330N. Moreover, the stresses acting in the outer race of the ceramic bearing, due to the space between the outer race and the bearing, were analyzed by FEM.