Panasonic Corporation

Tdk Corporation

Panasonic Intellectual Property Management Co., Ltd.

Tetsuro Mizushima

Kazuhisa Yamamoto

Jiro Yoshinari

Hideaki Miura

Tatsuo Itoh

Takuya Tsukagoshi

Hiroyuki Furuya

Shinichi Kadowaki

Kiminori Mizuuchi

Kenji Nakayama

Koichi Kusukame

Kenichi Kasazumi

Tomoya Sugita

Shinichi Shikii

Tatsuya Kato

Ken'ichi Kasazumi

Hiroshi Shingai

Akihiro Morikawa

Nobuyuki Horikawa

Shin-ichi Kadowaki

Akira Kurozuka

Hiroyasu Inoue

Takayuki Nagata

Koji Mishima

Hajime Utsunomiya

Toshifumi Yokoyama

Keiji Sugiyama

Kakuya Yamamoto

Yoshitaka Kitaoka

Teruyuki Takizawa

Tsuyoshi Komaki

Yoshimasa Fushimi

Susumu Uragami

Masaki Aoshima

Isamu Kuribayashi

Tomohiro Matsuo

Yuichi Hatase

Hironori Kakiuchi

Takahisa Shiramizu

Kazumi Ohtsubo

Hirofumi Enomoto

Junichi Mutoh

Rie Ihara

Hirohiko Oowaki

Takayuki Ooie

Yoshihiro Teshima

Hideki Sunohara

Akira Koruzuka

A laser light source device includes a semiconductor laser, a current supplying unit to supply a driving current to the semiconductor laser, and a signal generator to generate current intensity data for setting an intensity of the driving current. The signal generator generates, for an input signal corresponding to continuous pixels for a same color, a plurality of sets of the current intensity data indicating current intensities different from each other, and transmits the plurality of sets of the current intensity data to the current supplying unit while sequentially switching the plurality of sets of the current intensity data. The current supplying unit drives the semiconductor laser based on the plurality of different sets of the current intensity data.

Laser light source device and display apparatus

An object of the present invention is to provide an optical multiplexing apparatus and a projector that keep an optical system small, and easily adjust a number of light source units. The optical multiplexing apparatus has: a light source section that uses light source units to emit collimated beams; a first lens portion that converges the collimated beams which enter at different incident angles from each other to define converging positions; and a second lens portion that has focal points that correspond to the converging positions, respectively, wherein the first and second lens portions form an optical reduction system, and an optical axis of the second lens portion, which is directed to the corresponding focal point to one of the converging positions, extends along another optical axis of the second lens position, which is directed to the corresponding focal point to another of the converging positions.

Optical multiplexing apparatus and projector

The present application discloses a wavelength conversion device. The wavelength conversion device includes a light source for generating excitation light, a laser medium for generating fundamental light from the excitation light, a resonator mirror for forming a resonator for the fundamental light in cooperation with the laser medium, and a wavelength convertor for converting wavelength from the fundamental light into harmonic light. The wavelength convertor includes a first end surface inclined by an angle &#x3b8; from a surface orthogonal to an optical axis of the resonator and a second end surface parallel to the first end surface.

Wavelength conversion device and image display device

A wavelength conversion device includes an excitation light source that generates excitation light, a laser medium that generates fundamental light by means of the excitation light, two resonator mirrors that are disposed with the laser medium being interposed therebetween and resonate the fundamental light, a wavelength conversion element that is disposed between the two resonator mirrors and wavelength-converts the fundamental light to harmonic light, and a drive unit that generates a pulse modulation signal to pulse-drive the excitation light source. The laser medium is formed of a material having a thermo-optical effect and a positive thermo-optical constant. The pulse modulation signal generated by the drive unit has an initial interval including a rising edge of a pulse and a remaining interval subsequent to the initial interval. An average signal intensity during the initial interval is higher than an average signal intensity during the remaining interval.

Wavelength conversion device and image display apparatus using same

An image display apparatus includes: a laser light source for outputting a laser beam; a diffusion optical element for diffusing the laser beam; a drive unit for oscillating the diffusion optical element; and an image conversion unit for converting the laser beam output from the diffusion optical element into an image. The diffusion optical element disposed in the drive unit is oscillated and operated in a state where an amplitude of the drive of the drive unit, which is, for example, an amplitude that is driven in a direction of the arrow X in a plane that is perpendicular to an optical axis, is not constant.

Image display apparatus which reduces speckle noise and which operates with low power consumption

A laser projector includes a laser light source; a two-dimensional light modulator which modulates light from the laser light source; and a projection optical system which projects images onto a display plane by expanding the light modulated by the two-dimensional light modulator. Shift of a display position of the two-dimensional light modulation element and shift of the projection optical system are performed in synchronization with each other so that display positions of the images on the display plane are made substantially identical to each other. Thereby, speckle noise is sufficiently removed, and high-grade images are displayed.

Laser projector for removing speckle noise

There is provided a laser projector, including: a laser source section for emitting laser beams; a spatial light modulator which modulates the laser beams to generate image light; a projector lens from which the image light is emitted; a beam shaper which shapes the laser beams into a shape of the spatial light modulator; and a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens, wherein the pupil uniformizer is situated between the laser source section and the beam shaper.

Laser projector

A projector for projecting an image light including: a laser light source for emitting a laser beam; a light modulator for modulating the laser beam to generate the image light; a projection portion for projecting the image light; a detector for detecting a fixation degree of the projector; and a controller for controlling the power of the image light on the basis of the fixation degree.

Projector with illumination control based on fixation degree

A light source device is provided with a coherent light source for emitting the coherent light, and a pattern changer for changing an interference pattern of the coherent light on a surface of the illumination object. The pattern changer includes a photorefractive crystal which is arranged between the coherent light source and the illumination object and on an optical path of the coherent light and exhibits a photorefractive effect, and a changer for changing at least one of a light intensity distribution, a polarization direction, a wavelength and an intensity of coherent light incident on the photorefractive crystal. The illumination object is illuminated with the coherent light.

Light source device, lighting device and image display device

A wavelength conversion laser light sourcehas: a laser light source configured to generate fundamental wave laser light; and a wavelength conversion elementprovided with a periodic polarization reversal structure configured to convert the fundamental wave laser light which is incident onto the periodic polarization reversal structure into different laser light in wavelength wherein the wavelength conversion element includes different polarization reversal regions in period; and a polarization reversal axisof at least one of the polarization reversal regions is inclined with respect to an incident optical path of the fundamental wave laser light on the wavelength conversion element.

Wavelength conversion laser light source and image display apparatus

An image display system comprises red, green and blue laser light sources, a spatial light modulator that modulates the laser light of different colors in a time sharing manner and a controller that controls the operation of the laser light sources and the spatial light modulator. The green and red laser light sources are lit in this order in each frame. The green color is diminished due to the response delay of the spatial light modulator, but the green laser light produced by the green laser light source has a relatively large color phase shift from the standard green color so that the shortage of green color cancels the color phase shift of the generated green color so that the color phase shift of the displayed intermediate color can be minimized.

Image display system

A light projection device, includes a movable projector section which illuminates or display information by projecting light while moving a projection position; a position detecting section which detects a position of a lost article instructed by a user; a view field detecting section which detects a view field of the user, and a controller section which controls said movable projection section based on the lost article detected by the position detecting section and the view field of the user detected by the view field detecting section, and either directly illuminates the lost article or projects guide information for guiding the user to the lost article within a view field of the user.

Light projection device

A wavelength conversion laser light source includes: a fundamental light source for outputting fundamental light; a wavelength conversion element with a nonlinear optical effect for converting the fundamental light into harmonic light of a different wavelength; a first optical receiver for receiving light of a specific polarization direction contained in the fundamental light output from the fundamental light source and converting an amount of light thereof into an electrical signal; a second optical receiver for receiving the harmonic light output from the wavelength conversion element and converting an amount of light thereof into an electrical signal; a temperature holding unit for holding a temperature of the wavelength conversion element constant; a fundamental light control unit for performing first control of controlling an amount of light of the fundamental light output from the fundamental light source based on the electrical signal from the second optical receiver, and second control of controlling an amount of light of the fundamental light based on the electrical signal from the first optical receiver; and a temperature control unit for performing third control of controlling a holding temperature of the temperature holding unit based on the electrical signal from the second optical receiver.

Wavelength conversion laser light source having dual optical receiver and a temperature control unit, and projection display device, liquid crystal display device and laser light source provided with same

It is aimed to provide an LCD backlight device and liquid crystal display that can suppress light quantity loss and ensure uniform brightness. An LCD backlight devicehas a laser light sourcethat emits laser light, and a light guiding platethat transforms the laser light from the laser light sourceinto linear laser light, and transforms the linear laser light into a planar laser light, and emits the planar laser light, and the light guiding platehas a third side facethat transforms the linear laser light into the planar laser light by reflecting the linear laser light by a plurality of reflection surfaces that are formed along the entrance direction of the linear laser light.

Liquid crystal display backlight device and liquid crystal display

An information processor includes a housing, a projector attached to the housing, and a screen attached to the housing, wherein the projector projects light onto the screen.

Information processor with projector

Growing community of inventors

Osaka, Japan

Tetsuro Mizushima