PROBLEM TO BE SOLVED: To reduce electric power consumption, and to enhance utilization efficiency of the light by constituting a vehicular lighting fixture of a spheroidal reflecting surface for reflecting the light to the opposite side of the irradiating direction, a first reflecting surface for reflecting the light from a light source reflected by the spheroidal reflecting surface in the irradiating direction and a second reflecting surface for reflecting the direct light from the light source in the irradiating direction. SOLUTION: A part of the light from a light source 2 is reflected by a spheroidal reflecting surface 3a, and then, proceeds in the opposite direction of the irradiating direction of this vehicular lighting fixture 1 to be focused on a second focus 5. Since the spheroidal reflecting surface 3a rotates with the optical axis X as the center, the second focus 5 is positioned in a ring shape with the optical axis X as the center to control the light from a light source 2 in all directions. A first reflecting surface 4a reflects the light reflected by the spheroidal reflecting surface 3a in the irradiating direction of the vehicular lighting fixture 1. A second reflecting surface 4b receives the light except for the light irradiated to the spheroidal reflecting surface 3a among the light radiated from the light source 2 to radiate almost parallel beams of light in the irradiating direction of the vehicular lighting fixture 1 so that the light from the light source 1 is not directly irradiated in the irradiating direction. COPYRIGHT: (C)2001,JPO

Vehicular lighting fixture

A light source optical system for projection 1, dichroic mirrors 21, 22 disposed to have a predetermined included angle β, a reflection type liquid crystal optical element blocks 31-33 each including a closely contacted converging lens and having a reflection surface and a projection optical system 4 are provided, wherein the normal line of a dichroic mirror surface and the optical axis of incident light form an included angle α; the normal line of the reflection surface and the optical axis of incident light form an included angle γ; light emitted from a light source is color-separated so as to become color lights; the color lights are rendered to be parallel light beams, and are modulated and reflected by means of the reflection type liquid crystal optical elements; the reflected light beams are color-synthesized; and the color-synthesized light is projected through a projection lens. A projection type color liquid crystal optical apparatus having a compact shape and a high brightness is obtainable.

Projection type color liquid crystal optical apparatus

A light source unit includes a light source group wherein light sources are arranged into rows and columns so as to form a planar configuration and a primary reflecting mirror group disposed on an optical axis of the light source group to reflect light beams emitted from the light source group as light beams whose sectional areas are reduced in a column direction by narrowing intervals between light beams emitted from the light sources making up the rows of the light source group, the primary reflecting mirror group includes different strip-like reflecting mirrors disposed on optical axes of light beams emitted from the rows of the light source group in a step-like fashion, and the reflecting mirrors are disposed to eliminate intervals between reflected light beams from the reflecting mirrors, thereby making it possible to reduce the sectional areas of the light beams.

Light source unit, light source apparatus, and projector

This invention provides a projector capable of effectively utilizing the light from the light source and significantly reducing the light illuminating the outside of the area to be illuminated, thereby attaining an excellent efficiency of light utilization. In the illuminating system of the present invention provided with a light source and a reflector, there is further provided a circular reflector of a spherical surface, for returning the light, which emerges from the light source to the outside of the area to be illuminated, without being reflected on the reflector, to the light source. Also there is provided a flat mirror or a substantially spherical sub reflector for returning the light, which proceeds to the outside of the area to be illuminated, after being reflected on the reflector, to the light source. The sub reflector may be provided in the vicinity of the light source.

Illuminating optical system and projector utilizing the same

A bulb (4) of lamp (1) has a reflection film (2) or reflection mirror (9) to make light components going outside a reflector (3) direct to the reflector (3) to reflect. If the lamp (1) is a spot light source, a light emission center is positioned at a center of spherical reflection mirror (9). If the lamp (1) is not a spot light source, the reflection mirror (9) is made ellipsoid and at its two focal points, ends of two light emitting electrodes are positioned. Also, the lamp (1) having the reflection mirror (9) is used in the illumination unit for a liquid crystal display apparatus to increase the brightness of the image projected onto the screen (26). Further, the liquid crystal display device (23) has within a liquid crystal display device (23) a microlens array for collecting the incoming light into an area of each picture element electrode (39) to increase the light utilization efficiency of the liquid crystal display device (23).

Illumination unit for liquid crystal projection display apparatus and liquid crystal display apparatus having it used

A reflection type lighting apparatus includes a light source, a main mirror for reflecting light from the light source toward an illumination area to be illuminated, an auxiliary mirror for reflecting light from the light source toward the main mirror, and a light transmission portion surrounding the main reflection surface. The main mirror has a non-circular reflection surface which defines a light emission area. The auxiliary mirror has an auxiliary reflection surface with a center emission opening, to reflect light from the light source, transmitted through the light transmission portion, back towards the main mirror.

Reflection type lighting apparatus

PURPOSE: To reduce the size and to improve the light convergence efficiency by using the parabolic mirror as a main mirror and providing an auxiliary reflecting mirror which reflects light from a light source toward the light source without any loss at the open end part of the parabolic mirror. CONSTITUTION: A spot light source is placed at a focus F, the depth of the main mirror 11 consisting of the parabolic mirror is represented as the angle X, centered on the focus F, from a vertex P that an optical path O passes to the open end Q, and this angle X is set to ≥90°. Further, an auxiliary spherical mirror (auxiliary reflecting means) 13 is provided at the open end part of the main mirror 11 and reflects the light from the light source to the light source and its projection aperture diameter D 1 is set substantially equal to the open end part diameter ϕ 3 of the main mirror 1. The light has loss or irradiates a nonillumination area more in the case of unsatisfying the above conditions. Consequently, the device which is high light utilization efficiency and reducible in size is obtained. COPYRIGHT: (C)1992,JPO&Japio

Reflection lighting device with parabolic mirror

PURPOSE:To increase the utilization efficiency of light by forming the circumference of a main mirror as translucent part so that the shape of the reflecting surface of the main mirror forms a noncircular light-emitting region in a view from an optical axial direction. CONSTITUTION:The reflecting surface 11a of the main mirror 11 is formed only on a part corresponding to a prescribed light-emitting surface (a rectangle in this example), and its outside is the translucent part 11b. It does not partici pate in the light-emitting region of the rectangle. The rays of the light passing through the translucent part 11b are reflected by a reflecting surface 13a, returned to the reflecting surface 11a, reflected thereby and turned into luminous flux parallel to an optical axis O, to be emitted from a projection opening 14. Thus, the utilization efficiency of the light can be increased.

Reflecting illuminator having parabolic mirror

PURPOSE:To increase the utilization efficiency of light by boring a projection opening which is smaller than the diameter of the opening end part of a main mirror in the center part of an auxiliary reflecting means reflecting light, which is emitted from a light source, and reflected by the main mirror to the light source CONSTITUTION:An auxiliary parabolic surface mirror 13 is positioned as the auxiliary reflecting mirror outside the opening end part Q of the main mirror 11, its reflecting surface 13a is set opposite the reflecting surface 11a of the main mirror 11, and the focus F is made common with that of the main mirror 11 In the center part of this auxiliary parabolic surface mirror 13, the rectangular projection opening 14 is bored and its short and long sides are both less than the diameter D1 of the opening end part Q of the main mirror 11 The parabolic surface mirror 13, therefore, reflects a light beam, incident in parallel to the optical axis O, to the focus F, so the light which is reflected by the reflecting mirror 13a reaches the main mirror 11 after passing the focus F, and is reflected by the reflecting mirror 11a to go to light parallel to the optical axis O, so that the light is projected from the projection opening 14 Consequently, the device which is small in size and high in light utilization efficiency can be obtained

Reflective lighting device with parabolic surface mirror

PURPOSE:To make a device small in size and also to enhance a light condensing efficiency by combining an elliptic mirror and a spherical Fresnel's mirror or a micro roof-mirror. CONSTITUTION:The elliptic mirror having a light source 12 at a 1st focus P1 is formed as the mirror 11 having an elliptic head part formed as large as the extent to a plane which is obtained by orthogonally crossing with an optical axis 0 through the 1st focus P1, and the spherical Fresnel's mirror 13 or the micro roof-mirror 14 for reflecting direct light from the light source 12 toward the light source is arranged on the opening end part of the mirror 11 having the elliptic head part. By using the spherical Fresnel's mirror 13 or the micro roof-mirror 14 in such a way, the direct light from the light source 12 can be returned to the elliptic mirror 11 without making the diameter larger, then, a luminous flux can be effectively utilized. Thus, the device whose efficiency of utilizing light is enhanced can be obtained even though the device is made smaller in size.

Yoshida Kazuji

Papers

Reflection type lighting apparatus

Reflection lighting device with parabolic mirror

Reflecting illuminator having parabolic mirror

Reflective lighting device with parabolic surface mirror

Reflection illumination device with elliptic mirror