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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Kimura; Tohru
Address:
Hachioji, JP
No. of patents:
55
Patents:


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Patent Number Title Of Patent Date Issued
8199629 Objective lens for optical pickup device, and optical pickup device June 12, 2012
There are provided an objective lens for an optical pickup device which can record and/or reproduce information on/from an optical disk with high density with the use of a light flux with a short wavelength while keeping a temperature characteristic to be satisfactory in spite of hav
8121011 Optical element, aberration correcting element, light converging element, objective optical syst February 21, 2012
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of
8098562 Objective lens comprising a diffraction structure for distributing light in to light of differen January 17, 2012
An objective lens includes a diffraction structure for distributing much of a quantity of an incident light beam into two diffracted lights having different diffraction orders from each other, wherein recording or reproduction of information on an optical disk is performed by converging
8077585 Condenser lens for an objective lens system December 13, 2011
An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P.sub.1 (mm.sup.-1); and a second lens group having positive paraxial power P.sub.2 (mm.sup.-1) for converging a light flux emitted from
8077583 Optical element, aberration correcting element, light converging element, objective optical syst December 13, 2011
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of
7957249 Objective lens, optical pickup apparatus and optical information recording and/or reproducing ap June 7, 2011
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical
7957231 Optical pickup apparatus and objective optical element June 7, 2011
A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and the
7924683 Optical pickup apparatus with objective optical system and guiding optical system April 12, 2011
An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength .lamda.1 (430 nm>.lamda.1>380 nm), a second light source for emitting a second light flux having second wavelength .lamda.2 (.lamda.2>.lamda.1), an objective op
7920456 Objective lens for optical pickup device, optical pickup device and optical information recordin April 5, 2011
An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light beam emitted from the light source to an information recording surface of an optical infor
7903528 Optical pick-up apparatus March 8, 2011
An optical pickup apparatus for conducting recording and/or reproducing information for a first optical information recording medium including at least a transparent protective substrate, a first information recording surface, and a second information recording surface which are laminate
7889618 Objective optical element and optical pickup apparatus February 15, 2011
A first phase structure corrects at least one of a spherical aberration due to a difference between a protective substrate thickness t1 and a protective substrate thickness t2 and a spherical aberration due to a difference between a first wavelength .lamda.1 and a second wavelength .
7872959 Objective lens, optical element, optical pick-up apparatus and optical information recording and January 18, 2011
A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays
7855944 Optical element, optical pickup device and optical information recording and reproducing apparat December 21, 2010
An optical element for use in an optical pickup device to conduct reproducing and/or recording information for a first disk including a protective substrate by the use of a first light flux emitted from a first light source and to conduct reproducing and/or recording information for
7821904 Optical pickup apparatus and objective optical element October 26, 2010
A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and the
7778138 Objective optical element for optical pickup device, optical element for optical pickup device, August 17, 2010
An optical element for optical pickup device is provided with an optical path difference providing structure which provides a substantial phase change to a light flux having a predefined wavelength. The optical path difference providing structure is provided with a step portion having a
7719948 Lens unit for optical pick-up apparatus and optical pick-up apparatus May 18, 2010
The lens unit for the optical pick-up apparatus has: the objective lens by which the projecting light from the light source is condensed on the information recording surface of the optical information recording medium; the phase control element which is arranged on the light source s
7660225 Objective lens, optical pickup apparatus and optical information recording and/or reproducing ap February 9, 2010
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical
7623434 Objective lens, optical pickup apparatus and optical disc driving apparatus November 24, 2009
An objective optical lens for use in an optical pickup apparatus, includes: an optical surface divided into at least two areas including: a central area including a first diffractive structure; and a peripheral area including a second diffractive structure, the objective lens is a si
7606136 Object lens for optical pickup device, optical pickup device and optical information recording/r October 20, 2009
An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light beam emitted from the light source to an information recording surface of an optical infor
7593307 Objective optical system for optical pickup apparatus, optical pickup apparatus, driving apparat September 22, 2009
An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P.sub.1 (mm.sup.-1); and a second lens group having positive paraxial power P.sub.2 (mm.sup.-1) for converging a light flux emitted from
7564764 Optical element, optical pickup device and optical information recording and reproducing apparat July 21, 2009
An optical element for use in an optical pickup device to conduct reproducing and/or recording information for a first disk including a protective substrate by the use of a first light flux emitted from a first light source and to conduct reproducing and/or recording information for
7551539 Optical element, aberration correcting element, light converging element, objective optical syst June 23, 2009
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of
7542637 Coupling optical system, optical element and optical pickup apparatus June 2, 2009
The present invention relates to a coupling optical system, an optical element, and an optical pickup apparatus. A coupling optical system is provided for use in an optical pickup apparatus and is arranged between a light source and an objective lens of the optical pickup apparatus. The
7515523 Optical system for optical pickup apparatus, optical pickup apparatus, optical information recor April 7, 2009
An optical system utilized in an optical pickup apparatus comprising: an aberration-correcting element made of a plastic material; and a converging lens to converge a light flux emitted from the aberration-correcting element, the converging lens being made of a plastic material, wher
7512055 Objective optical element and optical pickup apparatus March 31, 2009
An objective optical element for use in an optical pickup apparatus having: a first light source for emitting a first light flux; a second light source for emitting a second light flux; an objective optical element, the objective optical element includes: an optical surface including
7489615 Objective optical element, optical pickup apparatus and optical disc driving apparatus February 10, 2009
An objective optical element for use in an optical pickup apparatus for recording and/or reproducing information on first--third optical information recording media using first--third light fluxes respectively, includes:a first phase structure for compensating a deterioration in a pe
7483358 Objective lens, optical element, optical pick-up apparatus and optical information recording and January 27, 2009
A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays
7463570 Multi-focus objective lens, optical pickup apparatus and optical information recording reproduci December 9, 2008
A multi-focal objective lens for use in an optical pickup apparatus for recording and/or reproducing information using a first light flux with a wavelength .lamda..sub.1 on a first and second optical discs, includes a first optical surface including a first diffractive structure. The
7460460 Objective optical system, optical pickup apparatus and optical information recording and reprodu December 2, 2008
An objective optical system for use in an optical pickup apparatus for converging first and second parallel light fluxes includes: a first lens group having a phase structure; and a second lens group, wherein the first lens group and the second lens group are arranged in the objective
7440381 Optical pick-up apparatus October 21, 2008
An optical pickup apparatus for conducting recording and/or reproducing information of an optical information recording medium, comprises a light source; a converging optical system having an objective lens; and a photo-detector. The converging optical system comprises a plastic lens
7417935 Optical system having an objective system and an optical aberration correcting element August 26, 2008
An optical system for use in an optical pickup device for recording and/or reproducing information on an optical recording media, the optical system having an optical axis and comprising: an objective system for converging a light beam emitted from a light source on the optical recording
7411883 Optical pickup device, optical information recording and reproducing apparatus, expander lens, c August 12, 2008
An optical pickup apparatus includes first and second light sources; an objective lens; a spherical aberration correcting optical unit; and a chromatic aberration correcting optical element which includes a diffractive surface on at least one optical surface of the chromatic aberrati
7408866 Objective lens for optical pickup apparatus, optical pickup apparatus and optical information re August 5, 2008
An objective lens, comprises a first diffractive structure having plural concentric ring-shaped zones. A n1-th order diffracted ray is converged on an information recording surface of first optical information recording medium through first protective substrate in such a way that whe
7382709 Objective lens, optical element, optical pick-up apparatus and optical information recording and June 3, 2008
A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays
7369481 Optical element, aberration correcting element, light converging element, objective optical syst May 6, 2008
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of
7352517 Optical pickup apparatus April 1, 2008
An optical pickup apparatus for conducting at least recording or reproducing of information on two types of optical information recording media having protective substrates with different thicknesses, includes: a first light source for emitting a first light flux with a wavelength .l
7345983 Optical pick-up device and optical information recording reproducing apparatus March 18, 2008
An optical pickup apparatus includes: first-third light sources; a packaged multiple light source unit for packaging emitting points of at least two of the first-third light sources in one housing; an objective optical system for converging light fluxes emitted by light sources onto
7330420 Objective lens unit, optical pickup apparatus and optical information recording and reproducing February 12, 2008
An objective lens unit for use in an optical pickup apparatus, includes a first optical element arranged opposite to the optical information recording medium; a second optical element arranged at a light source side of the first optical element opposite to the first optical element a
7319655 Diffractive optical element, objective optical system, optical pick-up device and optical inform January 15, 2008
A diffractive optical element, comprises a first diffractive structure to generate n.sub.11-th order diffracted ray when a first light flux having .lamda.1 (nm) of a wavelength comes in and to generate n.sub.21-th order diffracted ray (n.sub.11..gtoreq.n.sub.21) when a second light flux
7253968 Optical pickup device, optical information recording and reproducing apparatus and objective len August 7, 2007
An optical pickup device comprises a light source to emit a light flux having wavelength .lamda.; an objective lens including at least two plastic lenses of a first plastic lens having positive refractive power and a second plastic lens having positive refractive power, wherein the f
7206276 Objective lens, optical element, optical pick-up apparatus and optical information recording and April 17, 2007
A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays
7193954 Optical pickup device and objective lens for the optical pickup device March 20, 2007
An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element, wherein the first objective optical element converges the light flux emitted from the first
7177089 Objective, optical pickup apparatus and optical information recording and/or reproducing apparat February 13, 2007
An objective is used in an optical pickup apparatus which conducts reproducing and/or recording information for three different types of optical information recording media each having different thickness protective substrate by using three different wavelength light fluxes respectiv
7164645 Optical system for optical pickup apparatus January 16, 2007
An optical system has an expander lens and an objective lens. The following formula is satisfied: W1.sub.CM>W2.sub.CM, where W1.sub.CM is a coma aberration (.lamda.rms) of a converged light spot when an off-axial light flux of a wavelength .lamda. (nm) emitted so as to converge at
7133332 Light converging apparatus with aberration correcting element with paraxial power which has temp November 7, 2006
A light-converging optical system has an objective lens arranged at a position to be opposite to an optical information recording medium and including at least one plastic lens, and an aberration correcting element provided on an optical path between the light source and the objective
7110344 Objective lens, optical pickup apparatus, and recording and/or reproducing apparatus September 19, 2006
An objective lens for recording and/or reproducing information of an optical information recording medium, comprises at lest one aspherical surface. The objective lens is a single lens and satisfies the following formulas: 0.85<NA<0.98 0.80<d/f<3.00 0.5<.PHI.1<5.8 w
7079473 Objective lens, optical pickup apparatus and recording reproducing apparatus July 18, 2006
An objective lens for use in an optical pickup apparatus has two positive lenses of a first lens arranged at a light source side and a second lens arranged at an information recording medium side and the objective lens comprises a first surface being a light source side optical surface o
7031076 Objective lens, optical system and optical pickup apparatus April 18, 2006
An optical system for use in an optical pickup apparatus has a chromatic aberration correcting element having plural ring-shaped zones divided with a stepped section in such a way that one of the neighboring ring-shaped zones located apart from the optical axis has a longer optical p
6950383 Objective lens, light converging optical system, optical pickup apparatus, and recording and/or September 27, 2005
An objective lens for recording and/or reproducing information of an optical information recording medium, is a single lens having an aspherical surface on at least one surface. The objective lens is a finite conjugate type to converge a divergent light flux from a light source onto
6927923 Objective lens, converging optical system, optical pickup apparatus and recording and/or reprodu August 9, 2005
An objective lens for recording and/or reproducing information of an optical information recording medium, comprises a first lens group having a positive refractive power and a second lens group having a positive refractive power. The first lens group and the second lens group are ar
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