Abstract: In a conventional headphone set, there is a possibility that a headband cannot be put in a suitable position when an ear pad is snugly mounted on an ear. A headphone set of this disclosure includes speaker units which output a sound. The headphone set also includes: speaker housings which are brought into contact with a user; connecting portions which are connected to the speaker housings in a state where the speaker housings are movable in a forward and rearward direction of the user; and a headband which has connecting portions on end portions thereof and is mounted on a head of the user in directions toward a crown of the head of the user. Due to such a constitution, the headphone set can be used in a more stable manner.

Abstract: In a conventional headphone set, there is a possibility that a headband cannot be put in a suitable position when an ear pad is snugly mounted on an ear. A headphone set of this disclosure includes speaker units which output a sound. The headphone set also includes: speaker housings which are brought into contact with a user; connecting portions which are connected to the speaker housings in a state where the speaker housings are movable in a forward and rearward direction of the user; and a headband which has connecting portions on end portions thereof and is mounted on a head of the user in directions toward a crown of the head of the user. Due to such a constitution, the headphone set can be used in a more stable manner.

Abstract: An illumination apparatus includes a light source (1), a first integrator (11) into which light from the light source (1) enters, and a second integrator (33) into which light exiting from the first integrator (11) enters. Accordingly, the aperture shape of the first integrator (11) can be optimally designed, so that the light utilization efficiency can be increased. Furthermore, even when the length of the first integrator (11) is reduced, a deficiency in the light uniformity due to the first integrator (11) is compensated for by the second integrator (33), so that high uniformity can be secured at the surface to be illuminated.

Abstract: An illumination apparatus includes a light source (1), a first integrator (11) into which light from the light source (1) enters, and a second integrator (33) into which light exiting from the first integrator (11) enters. Accordingly, the aperture shape of the first integrator (11) can be optimally designed, so that the light utilization efficiency can be increased. Furthermore, even when the length of the first integrator (11) is reduced, a deficiency in the light uniformity due to the first integrator (11) is compensated for by the second integrator (33), so that high uniformity can be secured at the surface to be illuminated.

Abstract: A light source apparatus comprising a lamp having a light emitting portion of generating light, a first concave mirror having a first opening provided on a light-using side on which the generated light is used and a second opening provided on an opposite side to the light-using side and having the light emitting portion of the lamp placed inside, and a second concave mirror having a predetermined size to reflect on the light emitting portion side of the lamp the light which comes or should come out of the second opening and placed at a predetermined position in relation to a position at which the second opening is provided, and wherein the size of the second opening is provided so that an amount of the used light becomes substantially maximum.

Abstract: In a light source emitting single-color light represented by a solid light source such as a light emitting diode, a light output is increased while a color reproducibility is maintained. A red, a green, and a blue light emitting diode are controlled so that a first light emitting step of making the red light emitting diode emit light in a first light emission period, a second light emitting step of making the green light emitting diode emit light in a second light emission period, a third light emitting step of making the blue light emitting diode emit light in a third light emission period, and a fourth light emitting step of making the red light emitting diode, the green light emitting diode and the blue light emitting diode emit light at the same time in a fourth light emission period are carried out for display of one image.

Abstract: A projection type image display device includes a reflector 5 having an ellipsoidal reflection surface 4 as an inner surface thereof, a light source 35 in which at least a light emitting portion 1 is substantially planar, a light distribution thereof is within ±90° with respect to a normal line perpendicular to the plane, and the light emitting portion 1 is located optically at a first focus 3 of the spheroid forming the ellipsoidal reflection surface 4 of the reflector 5, a rod integrator 8 having an entrance opening portion in which a second focus 7 of the spheroid forming the ellipsoidal reflection surface 4 of the reflector 5 is located at the entrance opening portion thereof, a light modulator 11 capable of modulating an output of transmission light in accordance with an external signal, a relay optical system 10 for transferring an image of an exit opening portion of the rod integrator 8 onto the light modulator 11, and a projection lens 15 for enlarging and projecting the image on the light modulator 1

Abstract: An illuminator includes a color composition prism (24) consisting of first to third prisms (21-23), a red light emitting diode (1), a blue light emitting diode (2) and a green light emitting diode (3) emitting three light beams having different spectrum intervals, a first optical thin film (31) formed on the surface of the first prism (21) opposing the second prism (22) and having a cutoff wavelength between red and green, and a second optical thin film (32) formed on the surface of the second prism (22) opposing the third prism (23) and having a cutoff wavelength between blue and green. Consequently, it is possible to provide an illuminator that can conduct a color composition in which an optical loss at the time of color composition and a color unevenness occurring on the optical thin film due to the incident angle dependency are decreased even for natural light not under a polarization control.

Abstract: A projection display apparatus of good portability capable of realizing brightness equivalent to that of a conventional display apparatus and displaying a bright projected image upon supply of power has an extra high pressure mercury lamp, a lamp unit for thereby generating first light and light-emitting diodes, and includes a solid state light source unit for thereby generating second light, a movable mirror and a mirror portion adjusting mechanism for selectively guiding the first light or the second light to reflective indicating elements, and a projection lens for projecting the light modulated by the reflective indicating elements.

Abstract: In a light source emitting single-color light represented by a solid light source such as a light emitting diode, a light output is increased while a color reproducibility is maintained. A red, a green, and a blue light emitting diode are controlled so that a first light emitting step of making the red light emitting diode emit light in a first light emission period, a second light emitting step of making the green light emitting diode emit light in a second light emission period, a third light emitting step of making the blue light emitting diode emit light in a third light emission period, and a fourth light emitting step of making the red light emitting diode, the green light emitting diode and the blue light emitting diode emit light at the same time in a fourth light emission period are carried out for display of one image.

Abstract: A light source apparatus includes a lamp, an ellipsoidal mirror collecting a part of light radiated from a light transmission plane of the lamp, and a spherical mirror collecting another part of the light radiated from a light transmission plane not collected by the ellipsoidal mirror and reflecting it on the ellipsoidal mirror, in which a reflection plane of the ellipsoidal mirror and the reflection plane of the spherical mirror are in a form of non-rotation symmetry to an optical axis connecting a focal position F1 corresponding to a source of luminescence of the lamp to a focal position F2 of the light collected by the ellipsoidal mirror respectively. The distance between the reflection plane of the spherical mirror and the source of luminescence of the lamp is shorter than the distance between the source of luminescence and the focus of the light collected by the ellipsoidal mirror, and a part of the reflection plane of the ellipsoidal mirror is formed around the optical axis.

Abstract: In recent years, much attention has been paid to a projection type display apparatus using a plurality of light sources, as projection type video equipment capable of large screen display. However, in an optical system using a plurality of light sources, devices are designed so that uniform lighting can be provided assuming only the use of all the light sources. Thus, the uniformity of brightness within a display screen may be degraded if not all of the plurality of light sources are used. A light apparatus includes a plurality of lamp unit sections, a synthetic mirror section that reflects and synthesizes lights generated by all or some of the plurality of lamp unit sections and, and a synthetic mirror section adjusting mechanism that holds the synthetic mirror section so that its position can be changed so as to adjust the reflecting optical paths of the reflected lights.

Abstract: An illumination device includes plural lamps, a prism, a first lens array, and a second lens array, wherein the first lens array is formed such that images of the lamps are formed a predetermined space apart from each other on a lens, which corresponds to a predetermined lens among plural lenses of a second lens array, by light from the lamps having passed the predetermined lens of the first lens array. All or a part of plural images formed by a lens separate from the predetermined lens of the first lens array are practically arranged among the formed images of the lamps. And the second lens array is formed such that the images formed on the second lens array are irradiated on a light-receiving surface in a predetermined relation.

Abstract: A light source apparatus includes a lamp, an ellipsoidal mirror collecting a part of light radiated from a light transmission plane of the lamp, and a spherical mirror collecting another part of the light radiated from a light transmission plane not collected by the ellipsoidal mirror and reflecting it on the ellipsoidal mirror, in which a reflection plane of the ellipsoidal mirror and the reflection plane of the spherical mirror are in a form of non-rotation symmetry to an optical axis connecting a focal position F1 corresponding to a source of luminescence of the lamp to a focal position F2 of the light collected by the ellipsoidal mirror respectively. The distance between the reflection plane of the spherical mirror and the source of luminescence of the lamp is shorter than the distance between the source of luminescence and the focus of the light collected by the ellipsoidal mirror, and a part of the reflection plane of the ellipsoidal mirror is formed around the optical axis.

Abstract: A light source apparatus comprising a lamp having a light emitting portion of generating light, a first concave mirror having a first opening provided on a light-using side on which the generated light is used and a second opening provided on an opposite side to the light-using side and having the light emitting portion of the lamp placed inside, and a second concave mirror having a predetermined size to reflect on the light emitting portion side of the lamp the light which comes or should come out of the second opening and placed at a predetermined position in relation to a position at which the second opening is provided, and wherein the size of the second opening is provided so that an amount of the used light becomes substantially maximum.

Abstract: In recent years, much attention has been paid to a projection type display apparatus using a plurality of light sources, as projection type video equipment capable of large screen display. However, in an optical system using a plurality of light sources, devices are designed so that uniform lighting can be provided assuming only the use of all the light sources. Thus, the uniformity of brightness within a display screen may be degraded if not all of the plurality of light sources are used. A light apparatus includes a plurality of lamp unit sections, a synthetic mirror section that reflects and synthesizes lights generated by all or some of the plurality of lamp unit sections and, and a synthetic mirror section adjusting mechanism that holds the synthetic mirror section so that its position can be changed so as to adjust the reflecting optical paths of the reflected lights.