公开(公告)号：EP2465005A1

公开(公告)日：2012-06-20

申请号：EP10749518.6

申请日：2010-08-16

申请人： Akkolens International B.V.

发明人： SIMONOV, Aleksey, Nikolaevich ,  ROMBACH, Michiel, Christiaan

IPC分类号： G02B27/64 ,  G02B27/00 ,  G02B3/02 ,  G11B3/02 ,  G11B7/00 ,  F24J1/00

CPC分类号： G02B27/646 ,  F24S23/00 ,  G02B3/02 ,  G02B27/0068 ,  G02B27/0075 ,  G02C7/081 ,  G11B7/1356 ,  G11B7/13927

摘要： The invention refers to an optical system comprising at least two optical elements of which at least one is movable relative to the other in a direction perpendicular to the optical axis of the optical system, wherein the combination of optical elements is adapted to correct variable aberrations of at least two different orders simultaneously of which the degree of correction depends on the relative position of the optical elements. This optical system is adapted to correct aberrations which are variable and dependent on the position of the lens with respect to the subject/imaging plane. Further the optical system is adapted to correct aberrations varying along with defocus of the system. These aberrations may include second order aberrations, meaning defocus and astigmatism, third-order aberrations, meaning comas and trefoils, fourth-order aberrations, for example, spherical aberration, and further higher-order aberration terms.

公开(公告)号：EP0014048B1

公开(公告)日：1982-08-11

申请号：EP80300084.3

申请日：1980-01-08

申请人： CRANFIELD INSTITUTE OF TECHNOLOGY

发明人： Dinsdale, Jack ,  Parkins, David Walter ,  Hardwick, John Patrick

IPC分类号： G11B3/18 ,  G11B3/02 ,  H04R1/16

CPC分类号： G11B3/18

公开(公告)号：EP0014048A1

公开(公告)日：1980-08-06

申请号：EP80300084.3

申请日：1980-01-08

申请人： CRANFIELD INSTITUTE OF TECHNOLOGY

发明人： Dinsdale, Jack ,  Parkins, David Walter ,  Hardwick, John Patrick

IPC分类号： G11B3/18 ,  G11B3/02 ,  H04R1/16

CPC分类号： G11B3/18

摘要： A phonograph comprising means for damping unwanted horizontal and vertical vibrations of a pick-up cartridge (3) on an arm (1). The damping means comprises a paddle (10) moving in a trough (11) of viscous fluid. The paddle is fixed to the arm (1) near the pick-up cartridge (3). The trough (11) is fixed during use to extend with clearance above a record surface.
The damping means thus acts to damp the pick-up cartridge, giving relatively low damping below 5 Hz, moderate damping between 5 Hz and 20 Hz and high damping above 20 Hz.
The resonance frequency between arm and stylus can be adjusted to be too high to be initiated by warps and too low to fall within the audio bandwidth, by using a counter-balance mass (7) comprising a plurality of individually removable interfitting annular rings.
Known phonograph damping, acting far from the pick-up cartridge, is subject to more complex vibration modes, e.g. torsional vibrations of the arm, at high frequencies.