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21.发明专利
公开(公告)号：JP2003208724A
公开(公告)日：2003-07-25
申请号：JP2002003768
申请日：2002-01-10
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO
Abstract: PROBLEM TO BE SOLVED: To enhance productivity, reduce manufacturing cost and improve reliability of a focusing error signal. SOLUTION: An optical pickup apparatus 3 provided to an optical disk apparatus 1 has a composite optical element 32 that includes: a first diffractive grating 46 for splitting emitted light from a light receiving/emitting integrated element 31 into a main beam and two side beams; a second diffractive grating 47 for diffracting an optical path of each returned light from an optical disk 2; a beam modification hologram 48 places at a position on which each returned light diffracted by the second diffractive grating 47 is made incident to split each returned light to modify the beam shape with prescribed power; a total reflection mirror 49 for totally reflecting each returned light modified by the beam modification hologram 48; and a beam split prism 50 for further splitting each returned light totally reflected in the total reflection mirror 49 into three. Moreover, the light receiving/emitting integrated element 31 respectively receives the main beam in each returned light split by the beam split prism 50 to obtain the focusing error signal FE and receives the side beams to obtain a tracking error signal TE. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2002208167A
公开(公告)日：2002-07-26
申请号：JP2001005593
申请日：2001-01-12
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO , SUZUKI JUNICHI
Abstract: PROBLEM TO BE SOLVED: To improve degree of freedom in structuring an optical system and to reduce the manufacturing cost. SOLUTION: A composite optical element 12 having a first and a second reflection film 27, 28 that is arranged in the return path of an optical system for the purpose of bending an optical path, a first diffraction grating 25 for dividing the outgoing light emitted from a light source 11 into 0th and ±1st order light, a second diffraction grating 26 for diffracting the optical path of return light from an optical disk 4, and a dividing prism 29 that is arranged at the position on which the +1st order light diffracted by this second diffraction grating 26 is entered and that divides this +1st order light into a plurality of beams, is included. In addition, a light receiving element 15 which obtains focusing error signals by receiving each return light divided by the dividing prism 29, and obtains tracking error signals by receiving return light of the ±1st order light divided by the first diffraction grating 25, is included.
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Patent Agency Ranking
公开(公告)号：JP2002208166A
公开(公告)日：2002-07-26
申请号：JP2001005591
申请日：2001-01-12
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO
Abstract: PROBLEM TO BE SOLVED: To attain simplification and miniaturization of an entire optical system, and to reduce the manufacturing cost. SOLUTION: The device is equipped with a composite optical element 13 having a first diffraction grating 25 for dividing outgoing light from a light source 11 into light beams of 0th and ±1st order, having a second diffraction grating 26 for dividing each return light from a CD 3, DVD 4 into light beams of 0th and ±1st order with a diffraction angle that is different by the first and the second wavelength, and having a first and a second dividing prism 27, 28 that are arranged at the position on which the light beam of +1st or -1st order of the first and the second wavelength diffracted by the second diffraction grating 26 is entered and that divide the light beam of +1st or -1st order into a plurality of beams. In addition, it is equipped with a first and a second light receiving element 16, 17 in which focusing error signals are obtained by each return light of the first and the second wavelength divided by the first and the second dividing prism 27, 28, and in which tracking error signals are obtained by the return light of the ±1st order light divided by the first diffraction grating 25.
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公开(公告)号：JP2001018233A
公开(公告)日：2001-01-23
申请号：JP19411599
申请日：1999-07-08
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO
Abstract: PROBLEM TO BE SOLVED: To produce a mold for forming a lens having two different curved surfaces with high precision at a low cost. SOLUTION: The mold for forming a lens having different curved surfaces 5, 3, in which the outer peripheral part and the inside part are continued through inflection points 4, is produced by moving a tool while rotating molding material and by cutting or grinding the same. In the production method, after the curved surface of the outer peripheral part is cut or ground up to the inflection points 4, the above-mentioned tool is retracted from the predetermined cutting or grinding face of the curved surface of the inside part. After the tool is made to again pass the inflection points 4, the curved surface of the inside part is cut or ground.
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公开(公告)号：JP2000348359A
公开(公告)日：2000-12-15
申请号：JP15970299
申请日：1999-06-07
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO , YAMAGUCHI MASAAKI
Abstract: PROBLEM TO BE SOLVED: To obtain optical parts having excellent optical characteristics and excellent mechanical characteristics by devising the position of a gate at the time of molding of the optical parts which are integrally molded by resin molding and have an optically effective portion and a part to be supported. SOLUTION: The optical parts 1 are integrally molded with an objective lens 2 (optically effective portion) and a holder 3 (part to be supported) of the objective lens 2 by a transparent resin material. The shape over the entire part thereof has an axisymmetrical shape and the gate 11 at the time of molding is disposed on a symmetrical axis S and the injection direction of the resin is set to a symmetrical axis direction. As a result, the uniformity of the flow of the resin in the cavity of molds, the packability of the resin into the cavity, the transmittability of pressure retaining force, the residual strain in products, etc., may be maintained. The optical parts having the good optical characteristics of the optically effective portion and the good mechanical characteristics of the part to be supported may be obtained.
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公开(公告)号：JP2000030278A
公开(公告)日：2000-01-28
申请号：JP19428798
申请日：1998-07-09
Applicant: SONY CORP
Inventor： YAMADA TAKATOSHI , FUKAZAWA YOSHIO
IPC: G11B7/08 , G11B7/125 , G11B7/135 , G11B7/1374
Abstract: PROBLEM TO BE SOLVED: To preclude luminous flux of the outside of an optical effective surface, without impairing an optical performance by allowing a projection shaped spherical surface whose surface is rotationally symmetric to be a curved surface having no difference in level as to its radial direction and to have places, where differential coefficients are discontinuous at prescribed radial positions. SOLUTION: An objective lens 24 converges a light beam from a beam splitter on a desired tack on the signal recording surface of an optical disk, which is rotationally driven. Here, the lens 24 is movably supported in biaxial directions, that is, in the focus direction and the tracking direction. Relating to the objective lens 24, the surface 24a of a light source side is a projection shaped spherical surface, whose surface is rotationally symmetric and the surface is given by a function concerning distances (radii) from its optical axis. In this function, differential coefficients are continuous in a domain and coefficients become discontinuous at prescribed positions y0 in the radial direction. Moreover, since these positions y0 are in the domain and rays of light passing here become marginal rays, these positions are determined, so that the numerical aperture of the lens becomes a prescribed value (necessary numerical aperture).
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公开(公告)号：JPH10162409A
公开(公告)日：1998-06-19
申请号：JP32046196
申请日：1996-11-29
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO , KAWAKITA SATOSHI , KUBO MINORU , UEDA HIROYUKI
IPC: G11B7/135
Abstract: PROBLEM TO BE SOLVED: To make the recording and reproducing of an information signal satisfactory with respect to plural kinds of optical recording mediums whose thicknesses of transparent substrates are different by changing the numerical aperture of an objective lens as to the luminous flux of one wavelength and the luminous flux of other wavelength with a wavelength selective film. SOLUTION: The aperture for the luminous flux B1 of a first wavelength is the whole surface of a surface part and the luminous flux B1 is converged on the signal recording surface of a first optical disk 101a. The aperture for the luminous flux B2 of a second wavelength is an area where an antireflection film 2 is formed and where is in the surface part and the luminous flux B2 is converged on the signal recording surface of a second optical disk 101b. Since the numerical aperture is changed according to the difference of wavelengths by changing wavelengths of incident luminous fluxes in an objective lens 1, an optimum condition for recording and reproducing the information signal is realized with respect to the plural kinds of optical recording mediums whose thicknesses of transparent substrates are different.
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