Mitsubishi Electric Corporation

Shinji Yagyu

Akihiro Yamada

Hiroshi Kida

Kenji Samejima

Tomohiko Sawanaka

Atsushi Michimori

Noriyuki Komori

Toru Yoshihara

Tetsuya Nishimura

Koji Nakanishi

Nobutaka Kobayashi

Takeshi Utakoji

Mitsuaki Futami

Yuki Hasegawa

A light source apparatus according to the present invention includes a phosphor wheel having a phosphor disposed in an annular shape on a disk-shaped base material, the phosphor serving to emit fluorescent light from excitation light, thereby forming an excitation light source having a predetermined color, and the phosphor having a discontinuous portion in a part of the annular shape, an excitation light source for emitting the excitation light with which a passage position of the circular phosphor is irradiated with respect to the phosphor wheel to be rotatively driven by the wheel motor, and a controller that controls light emission of the light source and the excitation light source synchronously with a position of the discontinuous portion with respect to an irradiation position of the excitation light.

Light source apparatus and projector

A light source device has a first monochromatic light source group, a second monochromatic light source group, a polarization selection and wavelength selection element, a first phosphor layer, and a second phosphor layer. The first monochromatic light source group outputs first polarized light having a fixed polarization direction. The second monochromatic light source group outputs second polarized light having a fixed polarization direction. The first phosphor layer emits light in a first wavelength band. The second phosphor layer emits light in a second wavelength band. The polarization and wavelength selection element directs the first polarized light onto the first phosphor layer by transmitting the first polarized light and directs the second polarized light onto the second phosphor layer by reflecting the second polarized light, reflects the light in the first wavelength band and transmits the light in the second wavelength band.

Light source device using monochromatic light to excite stationary phosphor layers

A projection device includes: first light sources each emitting a first light; a collimator lens that converts the first lights into parallel light beams; a condensing optical system that receives the parallel light beams and emits concentrated light beams; and an optical element having an incident surface through which the concentrated light beams enters the optical element. The condensing optical system is configured so that when a light beam parallel to an optical axis of the condensing optical system is incident on the condensing optical system, the light beam is concentrated at a position on the axis on the incident surface. The parallel light beams are incident at different positions of the condensing optical system while approaching the axis. Emitting positions of the light beams on the condensing optical system and incident positions of the light beams on the incident surface are opposite each other with respect to the axis.

Projection display device

In a semiconductor laser array of the present invention, a plurality of laser elements (first to fifth laser elements) are disposed such that waveguides of the laser elements are parallel to one another, each of the plurality of laser elements includes a front-end-surface reflection film on a front end surface serving as a light emitting surface of the waveguide, each of the plurality of laser elements includes a rear-end-surface reflection film on a rear end surface opposite to the front end surface with the waveguide sandwiched between the front end surface and the rear end surface, the front-end-surface reflection films of at least two of the plurality of laser elements have different reflectances, the rear-end-surface reflection films of the plurality of laser elements have the same reflectance, and the plurality of laser elements are driven by a single power supply.

Semiconductor laser array

A light source device includes a plurality of light sources with different polarizations. A combined wavelength band of the light of a first polarization and second polarization is a first wavelength band. A combined wavelength band of a third polarization and fourth polarization is a second wavelength band. A plurality of selective transmission elements transmits one or more combined light of one or more polarizations and reflects one or more light of one or more polarizations. Thus, the light of the first polarization, the light of the second polarization and the light of the third polarization passing through a third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.

Light source device and projection-type display apparatus

In a projection display apparatus in which a laser beam source and an optical engine are connected together through an optical fiber, safety is improved against temperature rise in the optical fiber and its periphery. A projection display apparatus includes a temperature sensorprovided on the end portion, of the side of an optical engine, of an optical fiber groupfor connecting a laser beam sourceand the optical engineto each other, in which, by detecting temperature and informing to a controlling unitfor controlling the laser beam source, when temperature rise exceeding a set value having been set previously is detected, the controlling unitis made to control so as to decrease or stop output from the laser beam source

Projection display apparatus

A projection display device includes a light source, an optical intensity-equalizing element, an optical modulating element, an optical diffusion element, a relay optical system that is configured such that an output end of the optical intensity-equalizing element and a display element plane of the optical modulating element are optically conjugate, and a projection optical system. The relay optical system includes a first lens unit that condenses a light from the optical intensity-equalizing element and a second lens unit that further condenses a light from the first lens unit. The optical diffusion element is arranged between an light incident side of the first lens unit and the optical intensity-equalizing element. An optical axis of the second lens unit and a center of the output end of the optical intensity-equalizing element are shifted in a same direction from an optical axis of the first lens unit.

An oscillation drive device includes an oscillating unit that includes attaching portions on either sides thereof, the attaching portions being arranged on an oscillation axis; a base that includes an oscillating fulcrum that supports the oscillating unit on the oscillation axis and supporting portions that firmly support the oscillating unit; and a pair of strip-shaped leaf springs that is arranged so as to intersect with the oscillation axis and oscillates the oscillating unit on the oscillation axis, each of the strip-shaped leaf springs includes a fixing portion attached to the attaching portions of the oscillating unit; and a flexible beam portion that both ends of which are attached to the supporting portions of the base, and causes the oscillating unit to oscillate on the base by flexure behavior thereof.

Oscillation drive device

A projection-type display apparatus includes an optical engine that forms an image with a laser beam from a laser light source; and an optical fiber that connects the laser light source and the optical engine. The optical engine includes a rod integrator that equalizes an optical-intensity distribution of the light beam output from the laser light source, and a rod fiber-fastening unit that fastens the rod integrator and the optical fiber to face each other such that a gap between an input facet of the rod integrator and an output facet of the optical fiber is large relatively to a wavelength of the light beam propagating through the optical fiber.

Projection-type display apparatus

A projection display apparatus is provided that is capable of reducing speckle noise, with no image of a flaw or dust noticeable in or on a screen even if it exists in or on an optical component. The projection display apparatus includes a glass rod that makes uniform an optical beam emitted from a laser beam source; a lens that focuses an optical beam passing through the glass rod; a diffusion layer that provides an optical path difference distribution to the optical beam focused using the focusing element, the diffusion layer being optically conjugated with an incident end of the glass rod by the focusing element; a display device that spatially modulates the optical beam provided with the optical path difference distribution by the diffusion layer; and a magnification projection lens that projects on a screen an optical beam modulated by the modulator.

A drive is provided executing high-speed oscillatory motion. A voice coil motor in a pixel shifter includes a coil of a rectangular shape producing thrust along an axis, a flap fixing the coil, and flat springs giving to the flap an urging force against the thrust. An oscillation axis of the flap is parallel to the axis and located between another axis that is parallel and opposite to the axis and still another axis that is parallel to the axis and passes over a centroid of the coil. This reduces the value of the inertia per unit torque.

Drive with voice coil motor

A projection display includes first and second light sources, a reflection/transmission member which partially transmits a first light beam from the first light source and partially reflects a second light beam from the second light source, and a light valve which converts the light beam from the reflection/transmission member into an optical image in accordance with a video signal. The reflection/transmission member has a reflective surface which is one side main surface, a light-shielding surface which is the other side main surface, and a plurality of openings extending through the both main surfaces. The first light beam is transmitted through the openings from the light-shielding surface to the reflective surface, and the second light beam is reflected off the reflective surface in the direction that the first light beam is transmitted.

Growing community of inventors

Tokyo, Japan

Shinji Yagyu