JPH0517799Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light source device (hereinafter simply referred to as a light source device) for a projection type color display device such as a projection projector device or a liquid crystal projection display device.

[Prior art and its problems]

Projector devices and LCD projection display devices use a light source device to illuminate a film or liquid crystal light bulb, and then enlarge and project the image onto a screen via a lens system. Short arc discharge lamps, such as arc discharge lamps and metal halide short arc discharge lamps, are often used. This is because such short arc discharge lamps can vividly reproduce any color because of their white light source, and their high brightness increases screen illuminance and produces bright images.

Figure 1 shows the optical system of a projection projector that uses 16 mm or 35 mm film, in which a light source lamp 1, which is a xenon short arc discharge lamp, is surrounded by a reflector 2 whose cross section is a quadratic curve like a parabola. constitutes a light source device, and the reflected light from the reflecting mirror 2 passes through a film gate 3 having an aperture of a predetermined size.
irradiate. The film 4 moves along the film gate 3, and the image thereof is enlarged and projected onto the screen 6 via the lens system 5, as described above.

At this time, in order to project an even and high-quality image onto the screen 6, the light distribution characteristics on the small surface of the film 4 must be nearly uniform. In addition, in the case of a liquid crystal light valve, the diagonal is 1
It is necessary to uniformly irradiate a small surface of about 5". However, the envelope of a xenon short arc discharge lamp has a bulge in the light emitting space in which electrodes are arranged facing each other, and a cylindrical shape extending from both ends of the bulge. The light emitting center between the electrodes is located near the focal point of the reflecting mirror 2, but the cross section of the reflecting mirror 2 If is a parabola, the irradiated light will be almost parallel.Therefore, one current introduction part, which is the tip of the light source lamp 1, will be in the shadow, and the light distribution characteristics on the four sides of the film will be such that the illuminance at the center is There is a problem in that the projection image on the screen 6 is uneven because it is low and the peripheral part is high and non-uniform.

[Purpose of invention]

Therefore, the present invention has been developed to provide a projection projector device or a liquid crystal projection display device that has a simple structure, has a uniform light distribution characteristic in a film or a liquid crystal light valve, and can obtain a high-quality projected image without unevenness. The purpose is to provide a light source device that can.

[Structure of the idea]

The light source device of the present invention consists of a condensing reflector whose cross section is a quadratic curve, and a short arc discharge lamp disposed facing in the irradiation direction from a hole provided at the top of the condensing reflector. The quartz glass enclosure of a short arc discharge lamp consists of a light-emitting space bulge in which electrodes are arranged facing each other, and a current introduction part extending from both ends of the light-emitting space bulge. It is characterized by the following.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 2 shows a light source device, and the reflecting mirror 2 is a rotating parabola, and is composed of a cold mirror that transmits infrared rays and reflects only visible light. The opening of the reflecting mirror 2 is attached to the case 71 by a spring member 72, and a hole 21 for attaching a lamp is bored at the top thereof.

The light source lamp 1 is a xenon short arc discharge lamp with a total length of 150 mm and a power consumption of 150 W. The quartz glass enclosure has a light emitting space bulge 11 in the center, and a pair of electrodes 13 are installed inside it. , 13 are arranged facing each other. Cylindrical current introducing portions 12, 12 extend from both sides of the light emitting space bulge portion 11, and are each connected to a lead wire.
One current introducing part 12 is inserted through the hole 21 of the reflecting mirror 2 so that the longitudinal direction of the light source lamp 1 is aligned with the axis of the reflecting mirror 2, but the end of the current introducing part 12 is fixed to the mounting plate 73. , the mounting plate 73 is fixed to the substrate 73 with screws 74 for position adjustment.

Here, a frosted surface 14 is formed on the outer surface of the light emitting space bulge 11, as shown in FIG. FIG. 3A shows one electrode 13 closer to the reflector.
A headband-shaped frost surface 14 with a width of 5 mm is formed at the rear of the light emitting space bulge 1.
1, a frosted surface 14 is formed on the half closer to the reflecting mirror. FIG. 4 shows the illuminance distribution on the film surface when these light source lamps 1 are turned on. These show the irradiation intensity as a relative value, but Fig. 4C is a conventional example in which the frosted surface 14 is not formed, and within the range of ±30 mm, the central part is considerably lower than the peripheral part, and it is uniform. This is far from the case. On the other hand, Fig. 4A shows the illuminance distribution of the light source lamp of Fig. 3A, and Fig. 4B shows the illuminance distribution of the light source lamp of Fig. 3B. The uniformity of the illuminance distribution is considerably improved by the frosted surface, and a substantially uniform illuminance distribution can be achieved by the frosted surface on the half of the bulging portion of the light emitting space shown in FIG. 3B. This is because in the conventional case where the envelope is clear, the light emission center is between the electrodes and is small, but in this invention, the frosted surface of the outer surface of the envelope becomes a large light source and the light is diffused. It is. Therefore, the brightness of the projected image on the screen becomes uniform, and a high-quality projected image without unevenness can be obtained. It is clear that the light source lamp 1 is not limited to a xenon short arc discharge lamp, but may also be a short arc discharge lamp such as a metal halide short arc discharge lamp.

[Effect of idea]

As explained above, the quartz glass enclosure of the short arc discharge lamp, which is the light source lamp of the light source device of the present invention, has a light-emitting space bulge in which electrodes are arranged facing each other, and a current introduction part extending from both ends of the quartz glass enclosure. Since the outer surface of this light-emitting space bulge is a frosted surface, the light distribution characteristics of the film or liquid crystal light valve are uniform with a simple structure, and a high-quality projected image without unevenness can be obtained. The present invention can be used as a light source device for a projection projector device or a liquid crystal projection display device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an optical system, FIG. 2 is a partial sectional view of a light source device, FIG. 3 is an explanatory diagram of a light source lamp, and FIG. 4 is an explanatory diagram of light distribution characteristics. 1... Light source lamp, 11... Light emitting space bulge,
12... Current introduction part, 13... Electrode, 14... Frost surface, 2... Reflector, 21... Hole, 4... Film, 6... Screen.

Claims (1)

[Claims for Utility Model Registration] A projection type consisting of a condensing reflector whose cross section is a quadratic curve, and a short arc discharge lamp arranged toward the irradiation direction from a hole provided at the top of the condensing reflector. A light source device for a color display device, wherein the quartz glass enclosure of the short arc discharge lamp includes a light emitting space bulge in which electrodes are arranged facing each other, and a current introducing portion extending from both ends of the light emitting space bulge. A light source device for a projection type color display device, characterized in that the outer surface of the bulge portion is a frosted surface.