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61. 发明专利

JPH04340506A IMAGE FIBER 失效
公开(公告)号：JPH04340506A
公开(公告)日：1992-11-26
申请号：JP14114191
申请日：1991-05-16
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , CHIGIRA SADAO , TSUMANUMA KOUJI
IPC分类号： G02B6/06 , G02B6/00
摘要： PURPOSE:To obtain the image fiber of multiple picture elements which can transmit the object in an extremely narrow place in a blood vessel or the like as a bright image and have extremely small diameters. CONSTITUTION:The core of a fiber constituting the image fiber is constituted of single substance of germanium oxide. The clad is constituted of a glass which can be made into >=75% specific refractive index difference and has 10 to 10 poise viscosity at 120 deg.C. The more specific example of the glass to be used as the clad includes germanium oxide/boron oxide/fluorine glass. The core diameter of the fiber can be reduced to

62. 发明专利

JPH0431815A FIBERSCOPE 失效
公开(公告)号：JPH0431815A
公开(公告)日：1992-02-04
申请号：JP13764390
申请日：1990-05-28
申请人： FUJIKURA LTD
发明人： NAKATATE KENICHI , TANAKA KOJI , CHIGIRA SADAO , SANADA KAZUO
IPC分类号： G02B23/26
摘要： PURPOSE:To make an image fiber have a sufficient viewing angle and to transmit clear pictures even with a small diameter by forming a curved polished section which corrects aberration caused by the curvature of field of an objective lens on one end face of the image fiber connected with the objective lens. CONSTITUTION:An image fiber 1 is made of, for example, quartz glass rod and a curved polished section 13 is formed on one end of the fiber 1 on the object side so that the aberration caused by curvature of field of an objective lens 2 can be corrected. The section 13 is formed to have the same shape as the aberration of curvature of field of the objective lens 2 and to form the image of the objective lens 2 on the incident end face of the fiber 1. Therefore, the aberration of curvature of field of the objective lens 2 can be corrected and the fiber 1 can have a sufficient viewing angle and can transmit clear pictures even with a small diameter. As a result, a fiberscope can be reduced in diameter.

63. 发明专利

JPH03228009A QUARTZ-GLASS-BASED MULTI-UNIT FIBER SCOPE 失效
公开(公告)号：JPH03228009A
公开(公告)日：1991-10-09
申请号：JP2205590
申请日：1990-02-02
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , CHIGIRA SADAO , TANAKA KOJI
IPC分类号： G02B6/44 , G02B6/00 , G02B6/06 , G02B23/26
摘要： PURPOSE:To obtain the fiber scope which is long and has many picture elements and high flexibility by stranding and arranging multi-unit optical fibers around a tension member. CONSTITUTION:The multi-unit optical fibers 16 which are formed by forming circular jacket layer 20 on many quartz glass multi-unit fiber segments 18 having many cores arrayed in square-sectioned common clads are stranded around the tension member 10. A pressure winding layer 22 made of a 'Mylar(R)' tape, etc., and a plastic jacket layer 24 which covers the entirety are provided as external layers. The formation of both end parts when this fiber scope is connected is performed by unstranding the multi-unit optical fibers 16 and taking the tension member 10 out, cutting the end parts by specific length, taking out multi-unit fiber segments 18 which are exposed by removing UV coat layer 20 at end parts of the multi-unit optical fibers 16 to specific length and arraying them, and then adhering adjacent segments mutually with an adhesive.

64. 发明专利

JPH0378638A MEASURING METHOD OF FOCAL DISTANCE OF FIBERSCOPE 失效
公开(公告)号：JPH0378638A
公开(公告)日：1991-04-03
申请号：JP21548689
申请日：1989-08-22
申请人： FUJIKURA LTD
发明人： OOHASHI TATEYUKI , KANEDA KEIJI , CHIGIRA SADAO
IPC分类号： G01M11/02 , G02B7/28 , G02B23/26
摘要： PURPOSE:To obtain an exact focal distance by a method wherein a distance between a fiberscope and an image is changed, a differential value corresponding to the edge of the image is determined by making differentiation for each changed distance by using the luminance distribution of the image caught by the scope as a two-dimensional function, and the distance between the scope and the image at which this differential value is the maximum. CONSTITUTION:An automatic apparatus for measuring the focal distance of a fiber scope A being operated, a pulse stage 3 is moved so that a chart 1 for measurement be positioned at the origin (a) of an optical platform 5. Next, the value of a distance of each one movement of the chart 1 from the origin (a) as a starting point and the value of a whole distance of movement from the origin (a) in measurement in the last time are inputted to a computer 6, and an image of the chart 1 is picked up by a TV camera 7 of the scope A fixed on a block 4 of the optical platform 5 and converted into an electric signal. On the occasion, a light-source power source device 10 is controlled by using the computer 6 so that the brightness of the image picked up by the camera 7 be always fixed. Thereafter, an information thus obtained is stored in a frame memory 9 and the coordinates of a function of a luminance distribu tion are differentiated.

65. 发明专利

JPH0354509A FIBER SCOPE END STRUCTURE AND ITS MANUFACTURE 失效
公开(公告)号：JPH0354509A
公开(公告)日：1991-03-08
申请号：JP18875589
申请日：1989-07-24
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , CHIGIRA SADAO , TANAKA KOJI
IPC分类号： G02B23/26 , G02B6/06
摘要： PURPOSE:To easily form a fiber scope end part by connecting an image fiber to a rod lens by fusion splicing with a quarta lens material to obtain sufficient connection strength and cutting them to specific length after the fusion splicing. CONSTITUTION:The tip end surface of a quartz glass material for a relatively long rod lens of the same size with a quartz glass image fiber of about 300 mum in diameter is worked into a spherical surface. The rod is set opposite the image fiber and moved forth while both are heated and fused by arc dis charge or in oxyhdrogen flames, and the rod is further intruded by several mum-several mm even after contacting the image fiber to obtain sufficient adhesive strength. Finally, the rod is cut to about 150-200mum length from he connection part and the cut surfaces are polished to complete the fiber scope end part structure.

66. 发明专利

JPH02205467A POLISHING DEVICE FOR OPTICAL FIBER 失效
公开(公告)号：JPH02205467A
公开(公告)日：1990-08-15
申请号：JP2405989
申请日：1989-02-03
申请人： FUJIKURA LTD
发明人： TANAKA KOJI , NAKATATE KENICHI , CHIGIRA SADAO , SANADA KAZUO
IPC分类号： B24B19/00
摘要： PURPOSE:To confirm the polishing state without removing an optical fiber during polishing work and to increase working efficiency, by providing an optical device at the rotating polishing plate back face side of light permeability and yet at the position opposed to the optical fiber fitted to an arm part. CONSTITUTION:The end face of an optical fiber 6 is subjected to polishing together with a ferrule 30 end face by a polishing plate 4 under rotation. During this polishing, in inspecting the end face of this optical fiber 6, a driving part 32 is stopped at a specific position and the holding device 28 of the optical fiber 6 is located on the objective lens 44 of the optical device 36 provided at the back side of a rotating polishing plate having light permeability. In this state, the polishing state of the optical fiber 6 is photographed by the optical device 36 through the polishing plate 4, this is displayed on a monitor 10 and the flaw, etc., of the end face of the optical fiber 6 are confirmed by watching the monitor 10.

67. 发明专利

JPH02118502A IMAGE FIBER AND PRODUCTION THEREOF 失效
公开(公告)号：JPH02118502A
公开(公告)日：1990-05-02
申请号：JP27173388
申请日：1988-10-27
申请人： FUJIKURA LTD
发明人： CHIGIRA SADAO , TANAKA TOSHIYUKI , TSUMANUMA KOUJI , SANADA KAZUO
IPC分类号： G02B6/06
摘要： PURPOSE:To decrease the transmission loss in the outermost peripheral part so that uniform image observation can be made by forming the clad of the outermost layer of an image circle to the thickness equal to or larger than the clad thickness in the central part. CONSTITUTION:A material having the refractive index approximately equal to the refractive index of the clad of a coated image fiber 23 is first deposited by evaporation in the inner peripheral surface of a jacket tube 22 of a base material 21 for the image fiber to form a deposited layer 24. Many pieces of the coated fibers 23 are packed into this jacket tube 22 to form the base material 21 for the fiber. This base material is drawn under heating and melting by the same method as heretofore to form a coating 27 on the jacket 28, by which the image fiber 20 is obtd. The clad thickness t3 of the outermost layer is, therefore, the sum of the thickness of the deposited layer 24 and the thickness of the clad 26 of the coated fibers 23 and is the same as the clad thickness t2 in the central part. The transmission loss in the outer peripheral part is decreased and the observation of the uniform images is possible.

68. 发明专利

JPS63110402A IMAGE FIBER 失效
公开(公告)号：JPS63110402A
公开(公告)日：1988-05-14
申请号：JP25779286
申请日：1986-10-29
申请人： FUJIKURA LTD
发明人： SANADA KAZUO , TANAKA TOSHIYUKI , CHIGIRA SADAO
IPC分类号： G02B6/06
摘要： PURPOSE:To easily form an image fiber having an excellent contrast, by forming a recessed part by digging the clad of optical fibers exposed at one end face and removing the clad after the recessed part is filled with an opaque material. CONSTITUTION:A recessed part 7 of prescribed dimensions is formed by etching the clad 4, 4,... of optical fibers 2, 2,... exposed at one end face 5 of an image fiber 5 and the recessed part 7 is filled up with an opaque material 8. A synthetic resin, such as epoxy resin, etc., mixed with carbon powder, and other, whose light transmittance is low even if the thickness is thin and adhesiveness to glass is excellent, is used as the opaque material 8. Therefore, the opaque material filling the recessed part on the incident side prevents the incidence of light to the clad and the opaque material filling the recessed part on the emissive side prevents the emission of a clad mode. Thus the clad mode is eliminated and an optical image having an excellent contrast can be transmitted.

69. 发明专利

JPS62189404A IMAGE FIBER 失效
公开(公告)号：JPS62189404A
公开(公告)日：1987-08-19
申请号：JP3258486
申请日：1986-02-17
申请人： FUJIKURA LTD
发明人： TANAKA TOSHIYUKI , CHIGIRA SADAO , SANADA KAZUO , TSUMANUMA KOUJI , FUKUDA TAKERU
IPC分类号： G02B23/26 , G02B6/06 , G02B6/24
摘要： PURPOSE:To execute a replacement of only one, especially, a replacement of only a sending side part which has been damaged, by forming the sending side and a receiving side of an image, by a connected structure which can be divided, making the number of picture elements of the receiving side larger than the number of picture elements of the sending side, and connecting them by making the diameters equal to each other. CONSTITUTION:A sending side 1 and a receiving side 2 are formed by a connected structure which can be divided, connected by a connector 3, an objective lens, and an objective part 4 which has contained a fiber fixing means are provided on the tip of the sending side 1, and an eyepiece, and an eyepiece part 5 which has contained a fiber fixing means are provided on the end of the receiving side 2. A sectional structure of a connecting end 1a of the sending side 1, and a connecting end 2a of the receiving side 2 consists of picture elements 8..., 9... which have been formed by bundling many fiber strands and melting them as one body, and in this case, the number of picture elements of the receiving side 2 is set larger than the number of picture elements of the sending side 1. A tapered part 2b formed by decreasing the diameter of the connecting end of the receiving side 2 toward the tip is provided, and this part is cut on the way, and made equal to an image circle diameter of the sending side 1.

70. 发明专利

JPS6240405A INCIDENT END STRUCTURE OF LIGHT GUIDE FOR POWER TRANSMISSION 失效
公开(公告)号：JPS6240405A
公开(公告)日：1987-02-21
申请号：JP18152685
申请日：1985-08-19
申请人： FUJIKURA LTD
发明人： NAKAJIMA KIYOSHI , CHIGIRA SADAO
IPC分类号： G02B6/42
摘要： PURPOSE:To prevent the heat deterioration of the light guide without heating the light guide and providing a thermal insulation parts having a quartz rod and a passage of a cooling medium formed at an end surface side of said rod on the incident end surface of the light guide. CONSTITUTION:An infra-rod insulating deposited film 2 is provided on the end surface of a going out side of the quartz rod 1. The deposited film 2 is a filter of cutting the infra-red ray having >=1mum a wavelength, and is composed of the deposited film of an alternative laminated films made of for example MgF2 and ZnS. The thermal insulation parts 3 is pro vided on the quartz rod 1 so as not to transfer an exothermic heat of the quartz rod due to an absorption of the infra-red to the light guide. The thermal insulating parts 3 is composed of a metal having a good heat conductive property such as copper and a copper alloy. The quartz rod 1 is fixed by coupling closely an outer circumference of the quartz rod 1 with an inner circumference of the thermal insulating parts 3 at an open side of said parts 3. The heat of the quartz rod 1 is transferred to the cooling medium through the insulating parts 3, and discharged to the outside of the quartz rod, thereby preventing the thermal transmission for the incident part of the handle 4 by flowing the cooling medium such as a cooling water or gas from the inlet 3b of the cooling medium to the cooling passage 5.

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