Abstract: A light emitting section emits fluorescence upon receiving exciting light emitted from a laser element. The light emitting section includes a plurality of fluorescent material particles made from a single type of fluorescent material or several types of fluorescent materials, the plurality of fluorescent material particles being accumulated on a metal substrate to form a layer of the plurality of fluorescent material particles. Each of the plurality of fluorescent material particles has a surface coated with a coating layer. The coating layer forms an uneven shape of a surface of the light emitting section.

Abstract: A headlamp 1 includes (i) a laser element 2 for emitting a laser beam, (ii) a light emitting section 4, including a sealing material made from an inorganic material, for emitting fluorescence upon receiving the laser beam emitted from the laser element 2, and (iii) a heat sink 7 for releasing, via a contact surface of the heat sink 7 which contact surface is in contact with the light emitting section 4, heat generated in the light emitting section 4 in response to the laser beam emitted onto the light emitting section 4, the light emitting section 4 existing within a range which is determined on the basis of the contact surface and with which desired heat releasing efficiency is obtained.

Abstract: A headlamp of an embodiment of this invention includes a laser element, a light emitting section, and a parabolic mirror. A part of the parabolic mirror is provided so as to face an upper surface of the light emitting section, which upper surface has a larger area than that of a side surface of the light emitting section. The light emitting section emits fluorescence in such a manner that distribution of the fluorescence corresponds to the Lambertian distribution.

Abstract: A headlamp of one embodiment of this invention includes a laser element for emitting a laser beam, a light emitting section for generating fluorescence upon receiving the laser beam, and a reflecting mirror for projecting the fluorescence. Distribution of the fluorescence emitted by the light emitting section corresponds to Lambertian distribution, and an incident angle of the laser beam with respect to an excitation light irradiated surface, which is a surface of the light emitting section irradiated with the laser beam, is set so that use efficiency of the fluorescence emitted by the light emitting section is increased.

Abstract: A light emitting apparatus includes: a laser element which emits laser light; a light emitting section which generates fluorescence in response to the laser light emitted from the laser element; a parabolic mirror which reflects the fluorescence generated by the light emitting section; and a multilayer filter which transmits the laser light and reflects the fluorescence, the laser element being provided outside the parabolic mirror, the parabolic mirror being provided with a window part through which the laser light passes, and the multilayer filter being provided so as to cover the window part.

Abstract: A light emitting device of the present invention includes a light-emitting section for generating fluorescence by receiving a laser beam, and a light irradiation unit for irradiating a light irradiated surface of the light emitting section with a laser beam that increases regularly in beam diameter in a direction in which the laser beam travels.

Abstract: Provides a semiconductor laser device, as well as a manufacturing method therefor, capable of solving a problem of yield decreases in a structure for mounting a nitride semiconductor laser element onto a mount member. The nitride semiconductor laser device has a submount 2, and a nitride semiconductor laser element 1 which is mounted on a surface of the submount 2 with a solder 4 so that a nitride semiconductor is exposed from a side face thereof. The solder 4 is positioned between the submount 2 and the nitride semiconductor laser element 1 and has a width W3 smaller than a lateral width W4 of the nitride semiconductor laser element 1.

Abstract: A method of modifying the optical properties of a processed nitride semiconductor light-emitting device initially comprises disposing the processed nitride semiconductor light-emitting device in a vacuum chamber. One or more nitride semiconductor layers are then grown by molecular beam epitaxy thereby to modify the optical properties of the processed light-emitting device. Activated nitrogen, for example from a plasma source, is supplied to the vacuum chamber during growth of the nitride semiconductor layer(s). The use of activated nitrogen reduces the growth temperature required for the growth of the nitride semiconductor layer(s), as the need for thermal activation of a nitrogen species is eliminated. Moreover, use of a growth method such as, for example, plasma-assisted MBE to grow the nitride semiconductor layer(s) allows much more precise control of their thickness and composition.

Abstract: A nitride semiconductor light emitting device of the present invention includes; a GaN substrate into which a group VII element is doped; an intermediate layer section provided on the GaN substrate; and a light emitting layer provided on the intermediate layer section. The intermediate layer section has a sufficient thickness to prevent the group VII element diffused from the GaN substrate from being detected in the light emitting layer.

Abstract: The present invention provides a semiconductor light-emitting device including a Si substrate, a first clad layer, and an intermediate layer of n-AlInN between the substrate and the first clad layer. The intermediate layer is formed of AlxGayInzN, wherein x+y+z=1, 0≦y≦0.5, and 5/95≦z/x≦40/60. Thus on the Si substrate there can be provided a nitride-based, light emitting semiconductor device of high quality capable of electrical conduction from the Si substrate.

Abstract: The present invention provides a semiconductor light-emitting device including a Si substrate, a first clad layer, and an intermediate layer of n-AlInN between the substrate and the first clad layer. The intermediate layer is formed of AlxGayInzN, wherein x+y+z=1, 0≦y≦0.5, and 5/95≦z/x≦40/60. Thus on the Si substrate there can be provided a nitride-based, light emitting semiconductor device of high quality capable of electrical conduction from the Si substrate.

Abstract: An audio tape cassette having a magnetic tape which is wound around a hub, a cassette shell and guiding parts which comprises a polypropylene resin including inorganic particles "A" dispersed in the tape cassette, wherein the magnetic tape has a back coating layer containing a polyester resin and inorganic particles "B" which have a hardness of not larger than that of the inorganic particles "A", and the magnetic tape has a CP value which is not larger than 1000 .mu.m.

Abstract: A magnetic recording medium having high running stability and good magnetic characteristics without causing an abrasion problem, which comprises a base film, a magnetic layer provided on one surface (i.e. the major surface) of the base film and a back coat layer provided on the other surface (i.e. the back surface) of the base film, the back coat layer comprising a binder and non-magnetic particles dispersed therein, characterized in that the non-magnetic particles comprise at least one soft inorganic pigment having a hardness of less than 5 in Mohs' scale of hardness and at least one hard inorganic pigment of not less than 5 in Mohs' scale of hardness and of not more than 0.2 .mu.m in average particle size in a weight ratio of the soft pigment to the hard pigment of 99:1 to 50:50.

Abstract: Magnetic recording medium having a magnetic layer in which magnetic powder of the magnetic layer includes iron oxide magnetic powder with more than 30 m.sup.2 /g specific surface area measured by BET method, chromium dioxide (CrO.sub.2) magnetic powder with more than 30 m.sup.2 /g specific surface area measured by BET method, and the rate of the chromium dioxide powder is within a range more than 3% to less than 20% by weight in the total amount of the magnetic powder in the magnetic powder. Said magnetic layer further includes carbon black.

Abstract: A magnetic recording medium having a high durability with good electro-magnetic properties, which comprises a base material and a magnetic layer provided thereon, the magnetic layer containing magnetic particles and a binder, characterized in that the magnetic layer further comprises alpha-Fe.sub.2 O.sub.3 particles, Al.sub.2 O.sub.3 particles and Cr.sub.2 O.sub.3 particles.