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31. 发明专利

JPH01311426A OBJECTIVE LENS DRIVER 失效
公开(公告)号：JPH01311426A
公开(公告)日：1989-12-15
申请号：JP8139189
申请日：1989-04-03
申请人： HITACHI LTD
发明人： IKUMA AKITOMO
IPC分类号： G11B7/09
摘要： PURPOSE:To perform focusing position with a wide band area by providing an objective lens to read information, a frame to fix the lens, and a coil to drive the objective lens, and forming the fixing frame of the objective lens with plastic in which fiber is mixed. CONSTITUTION:Two pairs of coils 12 and (13a-13d) are interposed in a magnetic gap, and they are displaced in a direction of Y by energizing the focusing coil 12, and are displaced in a direction of X by energizing the tracking coils (13a-13d). On a barrel 10, the objective lens consisting of three lenses is fixed at an end part near to the upper side of a disk, therefore, the center of gravity of a driven body consisting of the lens barrel 10, lens frames 11a and 11b, and the coils 12 and (13a-13d) exists at a part sided to the lens in the lens barrel 10. Here, it is desirable to form the frames 11a and 11b in light weight and with rigidity, and polycarbonate in which glass fiber is mixed is used. Since the driven body is formed in the light weight and with the rigidity and a resonance frequency in a high-pass area is increased, the focusing position control with a wide servo area can be performed.

32. 发明专利

JPS61264528A OBJECTIVE LENS DRIVING DEVICE 失效
公开(公告)号：JPS61264528A
公开(公告)日：1986-11-22
申请号：JP10582785
申请日：1985-05-20
申请人： HITACHI LTD
发明人： IKUMA AKITOMO , KURODA NAOMITSU , SAEGUSA SHOZO
IPC分类号： G02B26/10 , G02B7/00 , G11B7/09
摘要： PURPOSE:To eliminate unnecessary resonance phenomena to make the focusing control and the tracking control easy by fixing both ends of a core in a supporting body to a copper foil surface through holes provided on a substrate by a solder or the like and attaching one end to a body to be driven and attaching the other to a fixed frame. CONSTITUTION:A screw 20 is provided for separating an oscillating system including a magnetic circuit and the body to be driven. With respect to a supporting body 11, both ends of contact coil springs 5a-5d are held on fixed frames 7, 8a, and 8b oppositely to each other through center cores 6a-6d of contact coil springs 5a-5d. Cores 6a-6d are projected from substrates 9, 10a, and 10b which are arranged on outsides of fixed frames 7, 8a, and 8b and are parallel with each other, and they are fixed by soldering or the like. With respect to the body to be driven, an objective lens 23 is stuck to the lens frame 11, and angularly wound focusing coil 15 and tracking coils 16a-16b are stuck to the lens frame 11, and respective end parts are soldered to substrates 10a and 10b.

33. 发明专利

JPS61239439A OBJECTIVE LENS DRIVER 失效
公开(公告)号：JPS61239439A
公开(公告)日：1986-10-24
申请号：JP7650986
申请日：1986-04-04
申请人： HITACHI LTD
发明人： IKUMA AKITOMO
IPC分类号： G02B26/10 , G02B7/00 , G11B7/09
摘要： PURPOSE:To attain the focus position control with a wide servo band by reinforcing a square drive coil by means of a fixing frame for an objective lens and increasing the high band resonance frequency of a matter to be driven. CONSTITUTION:The flanges 18a-18d of a lens frame 11a are welded on the upper surface of a focusing coil 12 for reinforcement of four sides of the coil 12. Then a lens frame 11b is welded to two sides of the lower surface of the coil 12 for reinforcement. Such a lens frame fixed to an objective lens at the center part increases the rigidity of a vibration system including the objective lens and a drive coil.

34. 发明专利

JPS61239438A OBJECTIVE LENS DRIVER 失效
公开(公告)号：JPS61239438A
公开(公告)日：1986-10-24
申请号：JP7650886
申请日：1986-04-04
申请人： HITACHI LTD
发明人： IKUMA AKITOMO
IPC分类号： G02B26/10 , G02B7/00 , G11B7/09
摘要： PURPOSE:To facilitate easy control of the optical axis of a matter to be driven with operation of a fastening screw by separating the matter to be driven and including an objective lens from a drive part including an attachment base and magnets. CONSTITUTION:The magnetic circuit members 17a and 17b consisting of yoke plates 3a and 3b and rectangular parallel piped magnets 4a and 4b magnetized in the thickness direction are fixed on a base 2 made of a die-cast material and having an opening part 1 at the center part by means of setscrews 5a and 5b with the polarities of the same sides set opposite to each other. The magnetic fluxes of the members 17a and 17b are produced toward arrows of magnetic gaps 6a and 6b respectively. Thus the 1st part is formed. Then the 2nd part is set opposite to the 1st part. That is, a support frame 7 and a terminal plate 14 are set opposite to the plate 3a of the member 17a for formation of a square. Then an end of each horizontal part of support springs 8a-8d is stuck to each of four corners of said square with an adhesive. While the other end of each horizontal part of screws 8a-8d is stuck to each of four corners of a mobile frame 9 respectively.

35. 发明专利

JPS6124034A Driver of objective lens 失效
标题翻译：目标镜头驱动
公开(公告)号：JPS6124034A
公开(公告)日：1986-02-01
申请号：JP14420384
申请日：1984-07-13
申请人： Hitachi Ltd
发明人： TOMIMORI NAOKO , SAEGUSA SHOZO , IKUMA AKITOMO , OKUDA TADASHI , YAMAUCHI YOSHIAKI
IPC分类号： G11B7/09
CPC分类号： G11B7/0932
摘要： PURPOSE:To attain high speed recording and reproduction by decreasing a mass and increasing a moment of inertial at a moving side member of an objective lens elastic support member so as to decrease excess vibration and attain reduction in recording/reproducing error and improvement of the S/N. CONSTITUTION:A body 2 to be driven including the objective lens 1 is supported by a plate spring 3 displaced only in the forcusing direction and a plate spring 4 displaced only in the tracking direction. Then both ends of the support spring 3 are fixed by a fixed support member 5 and a middle holder 6 and both ends of the support spring 4 are fixed with the middle holder 6 of the body 2 to be driven. Then the middle holder 6 is made hollow symmetrical to the center of gravity to reduce the mass and increase the moment of inertia thereby reducing the cross action of an objective lens driver, improving the S/N and reducing the recording/reproducing error.
摘要翻译：目的：通过减小物体并增加在物镜弹性支撑构件的移动侧构件上的惯性力矩来实现高速记录和再现，以减少过多的振动并减少记录/再现误差和改善S / N。构成：包括物镜1在内的被驱动体2由仅沿着倾斜方向移动的板簧3和只沿跟踪方向位移的板簧4支撑。然后，支撑弹簧3的两端由固定的支撑构件5和中间保持件6固定，并且支撑弹簧4的两端与主体2的中间保持器6固定以被驱动。然后，中间保持器6制成与重心对称的中空，以减小质量并增加惯性矩，从而减少物镜驱动器的交叉作用，改善S / N并减小记录/再现误差。

36. 发明专利

JPS60239939A OBJECT LENS DRIVING DEVICE 失效
公开(公告)号：JPS60239939A
公开(公告)日：1985-11-28
申请号：JP9445384
申请日：1984-05-14
申请人： HITACHI LTD
发明人： IKUMA AKITOMO , OKUDA TADASHI , IEGI KOUICHI , SASAMOTO TOSHIO
IPC分类号： G11B7/09 , H02K41/035
摘要： PURPOSE:To wind easily tracking coils to improve the productivity by providing notched grooves in pairs of upper and lower projecting parts formed on upper and lower both end parts surrounding the first recesses where the first coil of a bobbin is stored. CONSTITUTION:Pairs of upper and lower projecting parts 30c, 30d, 30e, and 30f formed on upper and lower both end parts surrounding the first recesses 30a and 30b where the first coil of a bobbin 2 is stored are provided with notched grooves 11a, 11b, 11c, and 11d. Magnetic circuits 10a-10b are attached to a base 9 so that a focusing coil 3 and tracking coils 4a-4b exist in gap magnetic fields. Consequently, tracking coils are wound without enfolding winding ends of the focusing coil, and the productivity is improved considerably.

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