Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Ecology Systems Guangdong Co., Ltd.

Hideki Hayashi

Sadao Mizuno

Yoshiaki Komma

Hidenori Wada

Hiroaki Yamamoto

Noboru Ito

Shin-ichi Kadowaki

Tomotada Kamei

Jouji Anzai

Shinichi Tanaka

Kenichiro Urairi

Yohichi Saitoh

Kousei Sano

Seiji Nishino

Keiichi Matsuzaki

Joji Anzai

Daisuke Ogata

Akihiro Yasuda

Eishin Mori

Tatsuo Ito

Jun-ichi Asada

Yasuhiro Tanaka

Kazuo Momoo

Ryusuke Horibe

Kanji Wakabayashi

Yasuo Fujikawa

Kenzo Ishibashi

Masatoshi Yajima

Bodong Zhong

Shouyong Gao

Min Long

Hisashi Senga

Yoshiyuki Hashimoto

Jiahan Hong

Kouretsu Boku

Shi Zhen

Kenji Matsumura

Atsuo Kikuchi

The present invention discloses a ventilating fan mounted on a wall of an indoor side of a wind path therethrough from the indoor side to an outdoor side. The ventilating fan includes a ventilating fan hood, a filtering member, a ventilating fan body, and a ventilating fan mounting member. The filtering member is integrally formed by a frame provided with an engagement that is engaged with the ventilating fan body and a filtering screen located within the frame. The ventilating fan according to the present invention has the advantages that the filtering member can be fixedly mounted to the ventilating fan body in a simple structure manner without using fasteners such as screws, so as to facilitate the operation and save the working time. Moreover, the filtering member is not blown off to fall off when the ventilating fan hood is removed. In addition, the mounting of the filtering member in a reverse order is eliminated.

Ventilating fan

An optical recording and playback apparatus includes: a light source configured to emit a light beam; a tracking mirror configured to change a direction of the light beam; a collimator configured to form the light beam into a parallel light beam; an objective lens configured to collect the parallel light beam to the optical tape; a lens actuator configured to adjust a position of the objective lens in a focus direction of the optical tape and a position of the objective lens in a tracking direction of the optical tape; a polarization hologram plate configured to separate a reflected light beam of the light beam; a photodetector receiving elements configured to receive the plurality of light fluxes; and a control circuit configured to control the lens actuator and the tracking mirror. The tracking mirror is disposed near the light source, and movable in the tracking direction.

Optical recording and playback apparatus

An optical pickup includes: a light source; a first diffractive element which diffracts light polarized in a particular direction; an objective lens; a lens actuator which shifts the objective lens so that the magnitude of shift from its initial position in a tracking direction has an upper limit of 0.3 mm to 0.6 mm; a wave plate; a second diffractive element which has two diffraction regions configured to diffract light polarized in a direction that intersects with the particular direction at right angles and which splits the write beam reflected from the optical storage medium through each diffraction region into a transmitted light beam and at least one diffracted light beam; and a photodetector which detects the transmitted light beam, the diffracted light beams that have left the two diffraction regions, and the read beam reflected from the optical storage medium.

Optical pickup and optical read/write apparatus

An optical pickup () includes a light emitting element (), a holding member (), a light receiving element (), and a base (). The holding member () is fixed to the base () by a combined bonding portion (). The combined bonding portion () is sandwiched between the holding member () and the base () so as to fix the holding member () to the base (). The combined bonding portion () includes a first bonding portion () composed of a first adhesive and a second bonding portion () composed of a second adhesive having a higher curing shrinkage rate than the first adhesive. The first bonding portion () and the second bonding portion () are each sandwiched between the holding member () and the base (), and the second bonding portion () is provided to cover at least a part of an outer peripheral surface of the first bonding portion (). A difference between the curing shrinkage rate of the first adhesive and that of the second adhesive is 3.0% or less.

Optical pickup with light receiving element and holding member and method of manufacturing the same

An optical pickup head is provided with a light source, a diffracting means for creating a plurality of diffracted beams, a converging means for focusing the diffracted beams onto an optical storage medium, a beam branching means for branching the plurality of beams reflected by the optical storage medium, and an optical detecting means for outputting a signal corresponding to the amount of light of the received beams. The optical detecting means has main beam light receiving portions and sub-beam light receiving portions. The amount of light of the first or higher order diffracted beams when they are substantially focused on and reflected by a focus plane of the plurality of information recording planes is equal to or greater than the amount of light of the zero order diffracted beam when it is reflected without focusing by a non-focus plane other then the focus plane of the plurality of information recording planes. The invention provides an optical pickup head where offset is not generated in the TE signals even during tracking with the objective lens when a two-layered disk is used.

Optical pickup head and information recording/reproducing device

A highly reliable optical pickup which is not likely to collide with an optical disk is provided. Relative positions of two objective lensesand(along a focus direction) on a lens holderare determined so that, while the objective lenshaving a longer working distance is focused on an optical disk, the objective lenshaving a shorter working distance and a protective memberare at positions which are more distant from the optical diskthan a height h of a protrusion which is present in an inner peripheral region of the optical disk optical disk

Optical pickup device and information processing apparatus incorporating the optical pickup

An optical pickup according to the present invention includes an integrated circuit element (LDD)for driving first, second, and third semiconductor lasers, and. The LDDis shaped so as to have a rectangular principal face surrounded by one side, with a plurality of input/output pins being arranged along each side. The plurality of input/output pins include a first pin group connected to a blue-violet laserwhose oscillation wavelength is the shortest, a second pin group connected to a red laser, and a third pin group connected to an infrared laser. The wiring structure of the optical pickup includes a first transmission linefor connecting the first pin group to the blue-violet laser, a second transmission linefor connecting the second pin group to the red laser, and a third transmission linefor connecting the third pin group to the infrared laser, where the first transmission lineis shorter than both the second and third transmission linesand. Of the rectangular principal face of the LDD, the side along which the first pin group is provided is orthogonal to the side along which the second pin group is provided or to the side along which the third pin group is provided.

Optical pickup and optical disc device

In a optical head, a beam is emitted from a light emitting element in which a plurality of light sources are integrally formed, the light sources being able to emit beams having different wave lengths from one another. An optical system converges the beam coming from any one of the light sources onto an optical information storage medium. An optical separator separates a reflected beam coming from the optical information storage medium from the beam coming from the light source. A light receiving element detects light quantities of the reflected beam separated by the optical separator.

Optical head and apparatus for and method of storing and reproducing optical information

A lens surface of a collimating lens closer to a light source is in contact with a retracted surface at one end surface of a barrel. On a projecting surface at an outer side of the one end surface of the barrel, grooves are formed at a plurality of positions symmetric with respect to an optical axis. An adhesive deposited in the grooves is applied to an outer circumferential surface of the collimating lens to fix the collimating lens in the barrel. Since the grooves are formed to be shallower than the retracted surface, the adhesive does not intrude onto the retracted surface. The barrel is pressed against a wall surface formed in an inner circumferential surface of a barrel holder main portion and having a V-shaped cross section by a leaf spring, thereby being held at a specified position in the barrel holder main portion. An amount of change in distance from a reference surface to a held position of the collimating lens per unit temperature is set to conform to a sum of an amount of change in movement of the light source from the reference position per unit temperature and an amount of change of back focus of the collimating lens per unit temperature.

Beam shaping optical device, optical head, and optical information medium drive unit

An objective lens for converging a light beam emitted from a first light source on a recording surface () of a first optical information recording medium covered with a transparent substrate () and converging a light beam emitted from a second light source on a recording surface () of a second optical information recording medium covered with a transparent substrate () having a thickness greater than the transparent substrate (). On an incident plane for the light beam, there are formed a center region (A), an intermediate region (A) surrounding the center region (A), and a peripheral region (A) surrounding the intermediate region (A). A diffraction grating () is provided on the lens surface of the intermediate region (A). Between the intermediate region (A) and the center region (A), and also between the intermediate region (A) and the peripheral region (A), stepped portions () are provided for causing an advance or a delay of a phase of a light beam passing through the intermediate region (A) with respect to the phases of the light beams passing through the center region (A) and the peripheral region (A). The stepped portions () are formed so that a value of a tertiary spherical aberration on the recording surface () of the second optical information recording medium becomes a value that makes a jitter value of a reproduction signal from the second optical information recording medium not more than 15%.

Objective lens, optical head apparatus, optical information recording/reproducing apparatus

An optical head performs recording and/or reproducing of a signal to an optical recording medium and comprises a light source, an objective lens converging the light emitted from the light source to the optical recording medium, and objective lens tilting mechanism for tilting the objective lens in order to correct aberration generated when the optical recording medium is tilted, and the optical head is assembled so that a direction of the coma aberration of the objective lens itself perpendicularly crosses a direction tilted by the objective lens tilting mechanism.

Optical head and optical recording and reproducing apparatus

An optical head is provided with: an objective-lens-use opening that determines an aperture of the objective lens; a light-source light-quantity controlling opening that aperture-controls light that has been separated by the light separation device; a light detector that receives light that has been aperture-controlled by the light-source light-quantity controlling opening; and a light detector that receives light that has been reflected by the optical recording medium, and has an arrangement in which: the length of the optical light path from the spherical aberration correcting device to the objective-lens-use opening is made virtually the same as a length of the optical light path from the spherical aberration correcting device to the light-source light-quantity controlling opening, and the aperture of the light-source light-quantity controlling opening has virtually the same size as the aperture of the objective-lens-use opening. The objective of the present invention is to provide an optical head in which a signal outputted from the light quantity detection device is unchanged even when the spherical aberration correcting device is driven so that by using this signal, the quantity of light from the light source is set to an appropriate value.

A lens support mechanism including a semiconductor laserfor emitting a laser beam, an optical head enclosureto which the semiconductor Laseris fixed and located, a collimator lensdisposed coaxially with the laser beam emitted from the semiconductor laser, a resin cylinderformed in a cylindrical shape so as to fix and locate the collimator lensto the inner surface thereof and a cylindrical memberfitted to the resin cylinderon a side of the collimator lensopposite to the semiconductor laserand formed so as to be fixed to the optical head enclosure. The cylindrical memberhas almost the same linear expansion coefficient as that of the optical head enclosure

Lens support mechanism, optical head device and optical information processor

An optical element having a high capture efficiency and rim intensity is provided. The optical element includes a central axis, a first curved surface extending in the transverse direction with respect to the central axis, a second curved surface extending in the transverse direction with respect to the central axis, and a peripheral surface extending between the first curved surface and the second curved surface. Light is refracted from the time light is incident on the first curved surface to the time the light is emitted from the second curved surface. Thereby, a light intensity distribution of the light emitted from the second curved surface and a light intensity distribution of the light incident on the first curved surface are different from each other, and a rim intensity improvement rate R, which is a rate of the rim intensity of the emitted light with respect to the rim intensity of the incident light is 1.07 or more and 1.5 or less, in which the rim intensity represents a ratio of the central intensity to the peripheral intensity.

Optical recording head capable of correcting spherical aberration

Conventional lenses for DVD/CD compatible writing/reading are liable to CD jitter deterioration due to phase shifts in a central area. Setting a corresponding base material thickness of an intermediate area of the circumference Ato greater than 1.2 mm which is the base material thickness of the CD, that is, converging luminous flux that has passed through the intermediate area of the circumference Aonto a farther place than the information recording surface of the base material thickness of the CD makes it possible to reduce jitter deterioration due to phase shifts. Further, it makes possible to provide a system with higher precision and higher reliability.

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Nara, Japan

Hideki Hayashi