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81. 发明专利

JPH04239641A MANUFACTURE OF PLASTIC ROD LENS 失效
公开(公告)号：JPH04239641A
公开(公告)日：1992-08-27
申请号：JP2408291
申请日：1991-01-24
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , CHIGIRA SADAO , TANAKA KOJI
IPC分类号： B29C47/06 , B29K33/00 , B29L11/00 , B32B7/02 , B32B37/15
摘要： PURPOSE:To continuously manufacture the above plastic rod lens having desired refractive index distribution by forming a plurality of plastic layers having a refractive index lower than that of the adjacent inner layer to the outer periphery of a plastic rod having a high refractive index and extruding a multiple block in a molten state. CONSTITUTION:A multiple block 5 has a rod formed from PMMA at the center part thereof. A plurality of fluorinated PMMA layers are formed to the outer periphery of the rod so that the degree of substitution of fluorine successively increases from the inside to the outside. The number of the layers of the multiple block 5 can be arbitrarily set according to desired refractive index difference and 5-10 layers are pref. A crucible 3 has an opening part 2 having an outer diameter slightly larger than that of the multiple rod 5 and reduced in its diameter toward an extrusion hole 1 and the inner diameter of the extrusion hole 1 is made same to the outer diameter of a rod lens to be prepared and a heater 7 is provided in the vicinity of the extrusion hole 1. When the multiple block 5 is inserted in the crucible 3 and pressed by a press member 4 to be extruded, a rod lens whose refractive index is reduced from the center part toward the periphery thereof is obtained.

82. 发明专利

JPH04187537A METHOD FOR PREPARING IMAGE FIBER 失效
公开(公告)号：JPH04187537A
公开(公告)日：1992-07-06
申请号：JP31433990
申请日：1990-11-21
申请人： FUJIKURA LTD
发明人： SETO KATSUYUKI , SHAMOTO NAOKI , TSUMANUMA KOUJI , CHIGIRA SADAO , TORITANI TOMOAKI , SANADA KAZUO
IPC分类号： G02B6/04 , C03B37/012
摘要： PURPOSE:To reduce distances between core rods and a clad rod to prevent the generation of buffer when melted, by inserting glass rods into many holes formed in the columnar glass rod at prescribed intervals in the axial direction thereof and subsequently melt-drawing the glass rod. CONSTITUTION:Many holes 2 are formed in a columnar glass rod 1 used as a clad in the axial direction thereof at prescribed intervals, and glass rods 3 used as cores are inserted into the formed holes 2 to prepare a matrix 4. The matrix is placed in a cylindrical muffle tube 6 composing a heating oven 5, heated with a carbon heater 7 and subsequently melt-drawn.

83. 发明专利

JPH0429514A MOVING UNIT IN CONDUIT 失效
公开(公告)号：JPH0429514A
公开(公告)日：1992-01-31
申请号：JP13677190
申请日：1990-05-25
申请人： FUJIKURA LTD
发明人： NAKATATE KENICHI , TANAKA KOJI , CHIGIRA SADAO , SANADA KAZUO
IPC分类号： H02G1/08
摘要： PURPOSE:To maintain the position and the direction at the tip of a moving unit stably by disposing a tip direction adjusting tool and a fulcrum telescoping tool, circumferentially split into three sections so that they can telescope individually in the radial direction, around the root at the tip section thereby swinging the tip section in random direction at each position thereby changing the direction. CONSTITUTION:Balloons 51, 52, split into four sections, are arranged at two points at the tip of a rod 3 with an interval in the longitudinal direction. When front balloons 51 are expanded and contracted individually, the tip section swings around the rod 3 at the position of the rear balloon 52 and the tip of the rod 3 directs toward each point in a conduit 1. When the rear balloons 52 are expanded and contracted individually, the tip of the rod 3 directs toward an arbitrary inner face of the conduit 1 with each position of the rear balloon 52 as a center. Influence of the motion of the rear rod 3 is relieved by means of an intermediate fulcrum balloon 53.

84. 发明专利

JPH0381717A FIBERSCOPE 失效
公开(公告)号：JPH0381717A
公开(公告)日：1991-04-08
申请号：JP21941989
申请日：1989-08-25
申请人： FUJIKURA LTD
发明人： TANAKA KOJI , CHIGIRA SADAO , SANADA KAZUO
IPC分类号： G02B23/26 , A61B1/00
摘要： PURPOSE:To obtain a distinct image without the rupture of a deformed part by performing plastic deformation such as twist or bending to a part of a quartz-based image fiber, inserting the deformed part into a ceramic pipe and filling the pipe with inorganic adhesive. CONSTITUTION:A hydrogen oxygen flame burner is used to burn the coating resin of the image fiber 2 and soften a part consisting of a clad 11 and a quartz jacket 12, where the plastic deformation such as bending same as the deformed part 23 is performed. Next, the bent deformed part 23 is covered with an alumina ceramic pipe 31, and the pipe 31 is filled with the inorganic adhesive 32 composed principally of alumina to be hardened. Then, both ends of the fiber 2 are ground to be like a mirror surface and the part where the deformation such as bending is performed is inserted into an ocular body 7. An objective lens 8 and an ocular 9 are mounted on the end face 4a of the objective side and the end face 6a of the ocular side of the fiber 2 respectively and a stainless flexible tube is used as a protective tube 3 so as to produce a fiberscope.

85. 发明专利

JPH0221563B2 失效
公开(公告)号：JPH0221563B2
公开(公告)日：1990-05-15
申请号：JP2728883
申请日：1983-02-21
申请人： FUJIKURA LTD
发明人： MYAMOTO SUEHIRO , INADA KOICHI , AKYAMA MICHIO , CHIGIRA SADAO
IPC分类号： G02B6/02 , G02B6/28

86. 发明专利

JPH02125221A CRYOGENIC FIBER SCOPE 失效
公开(公告)号：JPH02125221A
公开(公告)日：1990-05-14
申请号：JP27832088
申请日：1988-11-02
申请人： FUJIKURA LTD
发明人： CHIGIRA SADAO , OOHASHI TATSUYUKI , SANADA KAZUO
IPC分类号： G02B23/24 , G02B6/32
摘要： PURPOSE:To improve the handling operativity and reliability by reducing the pressure in an objective lens barrel, sealing both its ends with transparent windows, and connecting an optical path to one window in an abutting state. CONSTITUTION:This fiber scope consists of an ocular lens barrel 2 provided with an ocular 4, the objective lens barrel 9 provided with an objective lens 7, and the optical path 1 which transmits an image obtained by the objective lens barrel 9 to the ocular lens barrel 2. Then the pressure in the objective lens barrel 9 is reduced, its both ends are sealed with the transparent windows 8, and the optical path 1 is connected to one window 8 in the abutting state. Therefore, even when the objective lens barrel 9 is dipped in a cryogenic medium, the objective lens 7 is never dewed. Consequently, the stable image is obtained at all times and no suction device is required, so the operativity at the time of observation is improved.

87. 发明专利

JPH0225818A IMAGESCOPE 失效
公开(公告)号：JPH0225818A
公开(公告)日：1990-01-29
申请号：JP17637988
申请日：1988-07-15
申请人： FUJIKURA LTD
发明人： CHIGIRA SADAO , SANADA KAZUO
IPC分类号： G02B23/26 , A61B1/00 , A61B1/06
摘要： PURPOSE:To improve the S/N of an image and to facilitate observation by filling spaces between the side end surface of the eyepiece part of an image guide and the exiting end of a light introducing mechanism and between the image guide and an objective lens part with a refractive index adjusting agent. CONSTITUTION:The refractive index adjusting agent 24 having a refractive index similar to that of component material for the image guide 11, the objective lens 14 and a light isolator 20 is provided between the light isolator 20 and the end surface 11a of the image guide 11, between the end surface 11b of the image guide and the objective lens 14 and between the objective lens 14 and a window 14a. Thus, illuminating light made incident in the image guide 11 from a light guide 16 through the light isolator 20 is not reflected by the end part 11b of the image guide 11 or the objective lens 14, etc. Then, the S/N of the image of an observed object can be prevented from being lowered caused by making the reflected light reach the eyepiece part 18 and the distinct image of the observed object can be obtained.

88. 发明专利

JPH0212101A QUARTZ GLASS ROD LENS 失效
公开(公告)号：JPH0212101A
公开(公告)日：1990-01-17
申请号：JP16095588
申请日：1988-06-30
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , CHIGIRA SADAO
IPC分类号： G02B3/00 , C03B8/04 , C03B20/00 , C03C3/06
摘要： PURPOSE:To obtain an excellent lens which is free from fluctuation in a refractive index distribution by using quartz glass as an essential component and increasing the amt. of the fluorine to be added from the central part thereof outward in the radial direction thereby decreasing the refractive index. CONSTITUTION:While a quartz glass rod 1 which has 3mm diameter and 500mm length and is previously prepd. is rotated, the rod is traversed in the axial direction. On the other hand, a high frequency is impressed to a high-frequency coil 32 to generate an Ar plasma flame 4 while gaseous Ar plasma is supplied into a pipe 32. SiCl4 is then allowed to flow in a pipe 5 and CF4 in a pipe 6 to deposit SiO2 glass 2 contg. F; in succession, 10 layers of the same thickness are formed by successively increasing the flow rate of the CF4 at every 10sc cm without changing the other conditions to form the rod having 13mm outside diameter. The F-doped quartz glass layers 2 deposited on the outer periphery of the quartz glass rod 2 in such a manner are gradually increased in the doping quantity of the F toward the outside. The rod lens having gradual profile without having fluctuation thereof is obtd. in this way.

89. 发明专利

JPH01319001A LENS PLATE 失效
公开(公告)号：JPH01319001A
公开(公告)日：1989-12-25
申请号：JP15024988
申请日：1988-06-20
申请人： FUJIKURA LTD
发明人： CHIGIRA SADAO , SANADA KAZUO
IPC分类号： G02B3/00
摘要： PURPOSE:To improve heat resistance and the long-term stability of the optical characteristics of lenses by arraying plural pieces of the lenses specified in the number of pitches within the same plane and welding the respective adjacent lenses to each other. CONSTITUTION:Many pieces of a distributed index quartz glass base material 1a are inserted into a quartz tube 2 and a chuck 3 which can be traversed is attached to the circumference thereof and is progressed in a heating furnace 4. Fiber plate rods 6 drawn out of a heating furnace 4 by a take-off machine 5 are reduced to the small diameter over the entire part while the adjacent rods are welded to each other until the fiber plate rod is formed. The fiber plate rod is thereafter cut to a prescribed length and both ends are polished to obtain the fiber plate rod. The uniform illumination system which has the excellent heat resistance, can be easily placed to the position of the least circle of confusion of luminous fluxes without having the need for cooling and has good efficiency is formed in this way.

90. 发明专利

JPH01250217A IMAGE PROCESSING METHOD IN FIBER SCOPE SYSTEM 失效
公开(公告)号：JPH01250217A
公开(公告)日：1989-10-05
申请号：JP7895188
申请日：1988-03-31
申请人： FUJIKURA LTD
发明人： OOHASHI TATSUYUKI , CHIGIRA SADAO , SANADA KAZUO
IPC分类号： G01N21/88 , A61B1/04 , A61B5/107 , G01N21/93 , G02B23/24 , H04N7/18
摘要： PURPOSE:To detect an edge without receiving the effect of noise, by erasing the brightness distribution due to the pixels of a fiber scope by averaging processing and taking the difference between the image obtained when an object to be observed is present and an initial image to form a difference image. CONSTITUTION:In such a state that there is no object 2 to be measured, the image of a wall surface 6 is taken and the averaging of pixels is applied to said image to form an initial image. Subsequently, averaging processing is applied to the pixels in the vertical direction of a scanning line and the pixels noise having high frequency peculiar to an image fiber is removed to form an image to be measured. The initial image is subtracted from the obtained image to be measured to calculate the difference between both images to obtain a difference image. In this difference image, the brightness distribution of the image fiber in the diameter direction thereof and the boundary of the picture of the image fiber are erased and an edge is sharply drawn. When the difference image is differentiated, a differentiation signal is obtained and the edge of the object to be measured is calculated from the place giving the max. differentiation value of the difference image.

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