Abstract: 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 single lens and is commonly used for the first to third optical information recording media, the objective lens converges diffracted light fluxes with same diffraction order generated in the first diffractive structure onto information recording surfaces of the first to third optical information recording media, respectively, the objective lens converges diffracted light fluxes with different diffraction order generated in the second diffractive structure onto information recording surfaces of the first and second optical information recording media, respectively.

Abstract: An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P1 (mm?1); and a second lens group having positive paraxial power P2 (mm?1) for converging a light flux emitted from the first lens group on an information recording surface of an optical information recording medium.

Abstract: 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 information recording medium, and the optical pickup device is capable of recording and/or reproducing information by converging the light beam emitted from the light source to the information recording surface of the optical information recording medium with the converging optical system, the objective lens being a plastic single lens and satisfying following formulas when NA is an image-side numerical aperture required for recording and/or reproducing information to the optical information recording medium and f (mm) is a focal length of the objective lens.

Abstract: A structure according to the present invention is an optical pickup apparatus including a first light source, a second light source, a third light source, a first objective optical system, a second objective optical system, an incidence optical system for emitting the first to third light fluxes into the first objective optical system or the second objective optical system, and an optical detector. The optical pickup apparatus converges a light flux emitted from the first light source onto an information recording surface of a first optical information recording medium or a second optical information recording medium, by using the first objective optical system.

Abstract: An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P1 (mm?1); and a second lens group having positive paraxial power P2 (mm?1) for converging a light flux emitted from the first lens group on an information recording surface of an optical information recording medium.

Abstract: 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 a second disk including a protective substrate by the use of a second light flux emitted from a first light source, the optical element includes: an optical surface on which a first phase structure is formed to have a function to correct a spherical aberration; an optical surface on which a second phase structure is formed such that when the wavelength of the first light flux changes, the second phase structure generates a spherical aberration in a direction reverse to the direction of a spherical aberration generated by the first phase structure.

Abstract: 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 a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.

Abstract: 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 a second disk including a protective substrate by the use of a second light flux emitted from a first light source, the optical element includes: an optical surface on which a first phase structure is formed to have a function to correct a spherical aberration; an optical surface on which a second phase structure is formed such that when the wavelength of the first light flux changes, the second phase structure generates a spherical aberration in a direction reverse to the direction of a spherical aberration generated by the first phase structure.

Abstract: A time synchronizing signal for synchronizing the times of wireless nodes capable of wireless communication is transmitted to the wireless nodes by multihop. Optional information is transferred by multihop from a predetermined wireless node to an optional node along the same path as the transfer path of the time synchronizing signal by the wireless nodes. Information to respond the optional information is transferred by multihop from the optional wireless node to the predetermined wireless node along the reverse path to the transfer path of the time synchronizing signal.

Abstract: 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 a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.

Abstract: 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 coupling optical system includes: a first optical element with a power; and a second optical element with a positive power. The first optical element includes an optical surface, an out-effective-aperture section surrounding the optical surface, and a light-reduction structure arranged on the out-effective-aperture section. When a non-parallel light flux emitted from the light source enters into the out-effective-aperture section, the light-reduction structure reduces a light flux to be emitted from the second optical element in a direction getting closer to an optical axis of the second optical element.

Abstract: It is an object of the present invention to provide a wireless transmitting/receiving method for achieving both a high-speed data transfer and a power-saving operation by using wireless transmitting/receiving apparatus adaptable to a ubiquitous system, whereby a wireless transmitting/receiving method which performs wireless transmission/reception using no less than two carrier waves which belong to a different frequency band is used to transmit/receive a control signal for controlling the transmission/reception operation of the wireless transmitting/receiving apparatus by using a carrier wave which belongs to a lower frequency band (400 MHz band), and to transfer data by using a carrier wave which belongs to a higher frequency band (2.4 GHz band).

Abstract: 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, wherein the aberration-correcting element has a first optical surface provided thereon an optical path difference generating structure and has a second optical surface provided thereon a diffractive structure, and the converging lens is a single refractive lens having at least an aspherical surface.

Abstract: 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 a common area and an exclusive area; and a wavelength selective film formed on at least one of the common area and the exclusive area; wherein the common area transmits the first light flux which is formed into a converged spot on the information recording surface, and transmits the second light flux which is formed into a converged spot on the information recording surface, and the exclusive area transmits the first light flux which is formed into a converged spot on the information recording surface, and transmits the second light flux which is not formed into a converged spot on the information recording surface.

Abstract: 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 of each of first, second and third light flux having wavelength ?1, ?2 and ?3 when respective light flux comes to be incident into the diffractive structure respectively, the following formulas are satisfied: |n1|>|n2|, and |n1|>|n3|, and the hybrid objective lens converges a n1-th, n2-th and n3-th order diffracted ray of the first, second and third light flux onto an information recording plane of each of the first, second ant third optical information recording medium respectively so as to form an appropriate wavefront within respective prescribed necessary image side numerical apertures.

Abstract: A display device operating in accordance with a sub-field process, includes a first block which varies the number of bits of a received image signal, a second block which calculates an average picture level (APL) of images defined by the image signal transmitted from the first block, a third block which converts the image signal into sub-field coding data, and outputs the sub-field coding data to a display panel, and a fourth block which receives the average picture level from the second block, converts the received average picture level to the number of sustaining pulses, transmits the number of sustaining pulses to the display panel, and transmits the number of sustaining pulses to the third block, wherein the third block selects the number of bits of a signal to be input thereinto, in accordance with the number of sustaining pulses received from the fourth block.

Abstract: 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 performance forming the converged spot on the information recording surface of the first optical information recording medium caused by an temperature change, a second phase structure for reducing a spherical aberration based on a thickness difference between the protective substrates of the first and second optical information media or the a wavelength difference between the first and second wavelengths, and a third phase structure for reducing a spherical aberration based on a thickness difference between the protective substrate of the first and third optical information media.

Abstract: 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 smaller step difference than the predefined wavelength in an optical axis direction.

Abstract: 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 of each of first, second and third light flux having wavelength ?1, ?2 and ?3 when respective light flux comes to be incident into the diffractive structure respectively, the following formulas are satisfied: |n1|>|n2|, and |n1>|n3 |, and the hybrid objective lens converges a n1-th, n2-th and N3-th order diffracted ray of the first, second and third light flux onto an information recording plane of each of the first, second ant third optical information recording medium respectively so as to form an appropriate wavefront within respective prescribed necessary image side numerical apertures.

Abstract: 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 ?1 on a first and second optical discs, includes a first optical surface including a first diffractive structure. The multi-focal objective lens converges a diffracted light flux with one of the m-th diffraction order and the n-th diffraction order on an information recording surface of the first optical disc for recording and/or reproducing information of the first optical disc, and converges a diffracted light flux with another of the m-th diffraction order and the n-th diffraction order on an information recording surface of the second optical disc for recording and/or reproducing information of the second optical disc.