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1. 发明专利

JP2002303932A PROJECTING DEVICE 失效
公开(公告)号：JP2002303932A
公开(公告)日：2002-10-18
申请号：JP2001109950
申请日：2001-04-09
申请人： RICOH KK
发明人： FUJITA KAZUHIRO , YAMAUCHI YOSHITOSHI
IPC分类号： G02F1/13 , G02F1/1335 , G02F1/13357 , G03B21/00
摘要： PROBLEM TO BE SOLVED: To actualize a projecting device capable of projecting on a screen an image of high picture quality which is not affected by the degree of polarization of incident light and has high color purity and good color balance. SOLUTION: This projecting device forms an image on the screen by a means, which makes the illumination light from a light source incident on a laminated retardation film 1, splits the optical path of the light having passed through the laminated retardation film into two of component light having its polarization direction not changed and component light having its polarization direction changed by a PBS 2, guides one of the two split light components as illumination light to a 1st light valve 6, guides the other light component to a color separating element 3 and separates it into light beams of two color by the color separating element, guides the separated light beams of the two colors as illumination light to 2nd and 3rd light valves 7 and 8, forms color images by the 1st to 3rd light vales, and puts the respective modulated video light beams together, and a projecting means 9. Color filters 4 and 5 are arranged at one or more places between the 1st light valve and PBS, the 2nd light valve and color separating element, and the 3rd light valve and color separating element.

2. 发明专利

JP2002279657A OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND ERROR DETECTING METHOD THEREOF 失效
公开(公告)号：JP2002279657A
公开(公告)日：2002-09-27
申请号：JP2001079384
申请日：2001-03-19
申请人： RICOH KK
发明人： FUJITA KAZUHIRO , INOUE HIROYUKI
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing device having an optical system which can achieve the focusing and tracking operations with higher accuracy by effectively using luminous flux even the light reflected from a recording medium is weak, and to provide an error detecting method thereof. SOLUTION: The luminous flux from a light source 7 such as a semiconductor laser is made almost parallel light with a collimator lens 6, and a micro spot is formed on a recording medium 1 with an objective lens 4. the reflected light of the information (pit or mark) written into the recording medium is passed through the same optical path and collimated by the objective lens 4, and after the optical path is deflected with a beam splitter 5, the light is converged with converging functional elements 3a, 3b and received by photoelectrons 2a, 2b. The converging functional elements 3a, 3b are furnished with effective aperture diameters larger than the divided luminous flux.

3. 发明专利

JP2002251753A ERROR DETECTING METHOD, ERROR DETECTOR, RETURN LIGHT FLUX DIVISION OPTICAL ELEMENT, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION PROCESSOR 失效
公开(公告)号：JP2002251753A
公开(公告)日：2002-09-06
申请号：JP2001047955
申请日：2001-02-23
申请人： RICOH KK
发明人： FUJITA KAZUHIRO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To realize an error detecting method and its device efficient for minimization of an optical pickup device. SOLUTION: In this method to detect a focusing error and a tracking error based on a return light flux in the optical pickup device to perform one or more of recording, reproduction and deletion of information to an optical information recording medium to generate an interference pattern in a return light flux, the return light flux FX to move toward a return light detecting part is made incident on a return light flux division optical element 10, optically divided into a first light flux part FX1 in which density of the interference pattern in the zero-th order light of the return light flux does not change, second and third light flux parts FX2, FX3 in which the density of the interference pattern reciprocally changes by the return light flux division optical element 10, the focusing error is detected by using the first light flux part FX1 and the tracking error is detected by using the second and third light flux parts FX2, FX3.

4. 发明专利

JP2002079703A OPTICAL PRINTING HEAD AND IMAGING APPARATUS 失效
公开(公告)号：JP2002079703A
公开(公告)日：2002-03-19
申请号：JP2000273045
申请日：2000-09-08
申请人： RICOH KK
发明人： FUJITA KAZUHIRO , KANEMATSU TOSHIHIRO , INADA HISASHI , MASUDA KOJI , TAKAI MASAAKI , YOSHIMURA KENICHI , KINOSHITA MASAYUKI , OSUGI TOMOYA
IPC分类号： B41J2/44 , B41J2/45 , B41J2/455
摘要： PROBLEM TO BE SOLVED: To correct deformation such as bowing, deflection or the like of a minute light-emitting segment array by an array supporting member having a simple constitution. SOLUTION: The light-emitting segment array 16 is supported by the highly rigid array supporting member 17, whereby the bowing or the like even if generated to the minute light-emitting segment array 16 is corrected by the array supporting member 17. Since the array supporting member 17 is formed independently of a frame member 18 where the other optical parts are mounted, the array supporting member 17 can be manufactured highly accurately and easily. Moreover, since the minute light-emitting segment array 16 is assembled integrally with the array supporting member 17, it is made possible to handle the minute light-emitting segment array 16 separately from the other parts supported to the frame member 18, which is advantageous in terms of recycling because costs in replacing the minute light-emitting segment array 16 are reduced.

5. 发明专利

JP2001283460A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001283460A
公开(公告)日：2001-10-12
申请号：JP2000094669
申请日：2000-03-30
申请人： RICOH KK
发明人： FUJITA KAZUHIRO
IPC分类号： G11B7/135 , H01S5/022
摘要： PROBLEM TO BE SOLVED: To realize a small and thin optical pickup device dealing with the miniaturization of equipment such as an optical disk drive. SOLUTION: The optical pickup device is equipped with an objective lens function layer 11 which converges irradiating light on the information recording face of a recording medium to form a minute spot light on that face and which again converges the reflected light of this minute spot light into near collimation, an optical path separating function layer 14 which separates the reflected light nearly collimated in the objective lens function layer 11 from the optical path of the irradiating light, an optical path deflecting function layer 13 which deflects the optical path of the reflected light whose optical path is separated by the optical path separating function layer 14 and which leads the reflected light in the direction opposite to the irradiating direction, a converging element function layer 15 which converges the reflected light thus deflected by the optical path deflecting function layer 13, and a photodetecting function layer 16 which receives the light converged by the converging element function layer 15 to detect its intensity; the optical pickup device is constituted by laminating these layers.

6. 发明专利

JP2001195768A OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JP2001195768A
公开(公告)日：2001-07-19
申请号：JP2000005914
申请日：2000-01-07
申请人： RICOH KK
发明人： FUJITA KAZUHIRO
IPC分类号： G11B7/135 , G02B13/00 , G11B7/12
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing device capable of continuously correcting spherical aberration caused by an error of thickness of an optical disk substrate, always forming a suitable beam spot and performing reliable reading/writing. SOLUTION: In the optical information recording/reproducing device 1 condensing/irradiating a beam emitted from a laser light source 2 onto an optical information recording medium D through an objective lens 7, receiving a reflection beam from the optical information recording medium D by a photo- detector and converting/outputting the detection signal of the photo-detector to a voltage signal, a transparent parallel plane 4 formed by elastic and transparent material is arranged between the laser light source 2 and the objective lens 7, and the transparent parallel plane 4 is warped, and by adjusting its curvature, the aberration is corrected. Thus, even when an error exists in the thickness of the optical information recording medium D, by suitably deforming the transparent parallel plane 4 according to its error amount, the spherical aberration is corrected continuously.

7. 发明专利

JP2000013557A CONTACT TYPE IMAGE SENSOR 失效
公开(公告)号：JP2000013557A
公开(公告)日：2000-01-14
申请号：JP18988698
申请日：1998-06-19
申请人： RICOH KK
发明人： SAKURAI AKIRA , MAEDA IKUO , FUJITA KAZUHIRO , INOUE HIROYUKI
IPC分类号： H04N1/028
摘要： PROBLEM TO BE SOLVED: To provide a contact type image sensor capable of improving light utilization efficiency and performing thinning and miniaturization. SOLUTION: A rod lens 1 is fitted to a notched part 2c of a rectangular prism 2 with a clearance 12. The rectangular prism 2 is provided with a first reflection surface 2a and a second reflection surface 2b, and an original 3 is arranged at the 45-degree upper part of the first reflection surface 2a with a distance 11 from the upper surface of the rectangular prism 2. Also at a 45-degree upper part of the second reflection surface 2b, a line sensor 4 is arranged with the distance 13 from the upper surface of the rectangular prism 2. That is, when viewing is made the rod lens 1 and the rectangular prism 2, the original 3 and the line sensor 4 are arranged on the same side.

8. 发明专利

JPH1114936A IMAGE FORMATION ELEMENT 失效
公开(公告)号：JPH1114936A
公开(公告)日：1999-01-22
申请号：JP16723997
申请日：1997-06-24
申请人： RICOH KK
发明人： INOUE HIROYUKI , FUJITA KAZUHIRO , KANEMATSU TOSHIHIRO , MISAWA SHIGEYOSHI , MAEDA IKUO , UGA TAKAHITO
IPC分类号： G02B27/18
摘要： PROBLEM TO BE SOLVED: To effecively block ghost lights from reaching an image formation surface in an image formation element in which a roof mirror array or a roof prism array is used. SOLUTION: This image formation element has a first lens array 21 in which a series of lenses 25 which are optically equivalent are arranged in one line and which is to be positioned at an incident side and a second lens array 22 which is formed optically equivalently with the first lens array 21 and which is to be positioned at an image formation side and a roof mirror array 23 having ridge lines 27 orthogonally crossing the array direction of the lens arraies in the same pitch as that of the lenses 25 in between the lens arraies 21, 22 and an aperture array 24 which is arraged in accordance with the roof mirror array 23 and the first and second lens arraies 21, 22. This element blocks stray lights from reaching the image formation surface by the aperture array 24.

9. 发明专利

JPH0695029A ROOF MIRROR LENS ARRAY 失效
公开(公告)号：JPH0695029A
公开(公告)日：1994-04-08
申请号：JP26959892
申请日：1992-09-11
申请人： RICOH KK
发明人： FUJITA KAZUHIRO
IPC分类号： G02B27/18
摘要： PURPOSE:To simplify the formation of the roof mirror array by setting the number of the roof mirrors of the roof mirror array to a half as large as the number of lenses of a lens array. CONSTITUTION:The lens array 1 is formed by arranging the lenses successively and alternately in two arrays. The roof mirror array 3 has plural roof type reflecting surfaces formed successively at an arrangement pitch twice as large as the arrangement pitch of the lens array 1. A stop plate 2 is arranged between the lens array 1 and roof mirror array 3 while provided with an opening in parallel to the optical axis. Those members are integrated and held in a housing. Thus, the array pitch of the roof mirrors is set twice as large as that of the lens array for single image formation and their combinations are arranged in plural arrays to cover effective scanning width.

10. 发明专利

JPH05130329A ILLUMINATING LIGHT SOURCE UNIT AND COLOR READER 失效
公开(公告)号：JPH05130329A
公开(公告)日：1993-05-25
申请号：JP32087991
申请日：1991-11-08
申请人： RICOH KK
发明人： FUJITA KAZUHIRO
IPC分类号： G03B27/54 , G03G15/00 , H04N1/04
摘要： PURPOSE:To provide a compact illuminating light source which requires no color filter by providing a housing member where plural monochromatic light emitting sources are unified and applying an optical reflecting surface to the inner surface of the housing member. CONSTITUTION:The color reader consists of a fluorescent lamp 5 corresponding to R, G and B and serving as a light source, a convergent rod lens serving as an image forming element 2, and an unmagnification sensor 3. A reflecting plate 4 extends up to a point near the reading position, and the direct light of a light emitting source never enters the plate 4. Furthermore the straight line connecting the tip of a reflecting member set close to the element 2 of the plate 4 and the tip of the reflecting plate of the opposite side never enters the opening part of the element 2. In such a constitution, the component elements are easily arranged and the colors can be read in a higher contrast.

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