JPH0582013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electrode connection structure for a xenon lamp.

[Prior art and its problems] In general, a liquid crystal projector uses a transmissive liquid crystal display panel to display images of television, etc.
The displayed image is enlarged and projected onto a screen, and is equipped with a xenon lamp as a light source behind the liquid crystal display panel, and a projection lens in front that enlarges and projects the image displayed on the liquid crystal display panel. ing.

Conventionally, such a xenon lamp has an anode 2 and a cathode 3 disposed facing each other in a lamp body 1 as shown in FIG. 6, and a high voltage is applied between them to cause discharge and generate light. This light is reflected by a parabolic reflector 4 into parallel rays and irradiated onto a liquid crystal display panel 5. In this case, the anode terminal 2 to which high voltage is applied is located on the light irradiation side,
It is connected to a power source 7 by a lead wire 6 having a diameter of about 2 mm. Note that the cathode terminal 3 is also connected by a lead wire 6.

However, since the anode terminal 2 is located on the light irradiation side (left side in the figure), the shadow of the lead wire 6 appears on the screen as shown in Figure 7, which is a drawback as a light source for an LCD projector. Not only that, but also when this xenon lamp was used for other purposes, it had the problem that it was difficult to obtain uniform light.

[Object of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a connection structure for a xenon lamp that can realize a good light source with less shadows from connection wires such as lead wires. It's about doing.

[Summary of the invention] In order to achieve the above-mentioned object, the present invention has the following features:
The connection wire connected to the electrode terminal of the xenon lamp located on the light irradiation side is made into a thin flat plate.

[Embodiment] An embodiment in which the present invention is applied to a liquid crystal projector will be described below with reference to FIGS. 1 to 5.

FIG. 5 shows a liquid crystal projector. This liquid crystal projector 10 includes a liquid crystal display unit 12, a light source unit 13, a lens unit 14, etc. on a base 11, and the light source unit 13 irradiates the screen of the liquid crystal display unit 12 with light.
The image displayed on screen 2 is enlarged and projected onto a screen (not shown) by a lens unit 14.

The liquid crystal display unit 12 displays images on a television or the like, and is composed of a liquid crystal display panel 15 and a drive circuit board 16. The liquid crystal display panel 15 is a TN type (twisted nematic type) transmissive type capable of color display, has a large number of electrodes in a matrix, and has a base 11.
It is erected near the center of the screen, and is connected to the drive circuit board 16 to display images. In this case, heat pipes 17, 17 for cooling are attached to the liquid crystal display panel 15. These heat pipes 17, 17 are connected to the liquid crystal display panel 15.
It protrudes upward, its tip is bent toward the back side (right side in the figure), and heat dissipation fins 17a are attached to this bent portion. On the other hand, the drive circuit board 16 includes drive circuit sections 16a and 16b that drive the liquid crystal display panel 15.
It is equipped with a liquid crystal display panel 15 on the upper and lower sides.
The driving circuit portions 16a, 16b are installed vertically near the
are connected to the scanning electrode and the signal electrode of the liquid crystal display panel 15, respectively. Further, the drive circuit board 16 is connected to a linear circuit section 19 via an A/D conversion circuit section 18. This linear circuit section 19
is placed under the base 11 and connected to a receiving unit (not shown) equipped with a television radio wave receiving circuit, an audio amplification circuit, a speaker, etc., and is configured to provide a predetermined electrical signal to the drive circuit board 16. It's summery.

The light source unit 13 irradiates the liquid crystal display panel 15 with light from the back side of the liquid crystal display unit 12, and includes a xenon lamp 20, a reflector 21,
It consists of a light guide pipe 22, a heat ray absorption filter 23, and the like. The xenon lamp 20 is
As shown in the figure, an anode terminal 20b and a cathode terminal 20c are arranged inside a lamp body 20a, and light is generated by causing a discharge between these electrodes. Located at the center of the object surface (intersection of each normal line), and with cathode terminal 2
The 0c side is attached to the reflector 21, and each electrode terminal 20b, 20c is connected to the connecting wire 20.
It is connected to the lamp power supply 24 by terminals d and 20e. In this case, the connecting wire 20d connected to the anode terminal 20b on the front side of the reflector 21, that is, on the side to which light is irradiated, is a thin flat plate in the form of an elongated strip, and has an approximately "L" shape, with one end thereof As shown in FIG. 3, it is attached to the anode terminal 20b in a tubularly curved manner, and the other end is connected to a lead wire 20f connected to the lamp power supply 24, and as shown in FIG. The direction is arranged along the direction of light irradiation. Note that the cathode terminal 20e is simply a lead wire, and is connected to the lamp power source 24.

Further, as shown in FIG. 5, the reflector 21 of the light source unit 13 reflects the light generated by the xenon lamp 20 and irradiates the liquid crystal display panel 15 with parallel light through the light guide pipe 22 and the heat ray filter 23. It has a parabolic reflecting mirror, and is placed at one end of the light guide pipe 22, and is erected together with the light guide pipe 22 on the back side of the base 11 (on the right end side in FIG. 5). It is attached to a supporting plate 25. The light guide pipe 22 guides light to the heat ray absorption filter 23, and has a cylindrical shape, and its inner surface is a reflecting mirror, and a heat radiation hole 22a is formed on the upper surface on the xenon lamp 20 side.
An opening 22b is formed on the lower surface of the front side (heat ray absorption filter 23 side), and a cooling fan 26 is provided below this opening 22b. This fan 2
6 is designed to feed cooling air into the light guide pipe 22 and circulate it, and to radiate the heated air through the heat radiation hole 22a. In addition, heat ray absorption filter 2
Reference numeral 3 absorbs heat from the light when the light passes through it, and is located on the back side of the liquid crystal display panel 15, attached to a support plate 27, and erected on the base 11.

On the other hand, the lens unit 14 condenses the light transmitted through the liquid crystal display panel 15 of the liquid crystal display unit 12 and projects it in an enlarged manner.
and a projection lens 29. The Fresnel lens 28 vertically contracts and focuses the light that has passed through the liquid crystal display panel 15, and is located on the front side of the liquid crystal display panel 15, and is attached to a support plate 30 and stands on the base 11. It is set up. Projection lens 2
9 is for enlarging and projecting the light collected by the Fresnel lens 28 onto a screen (not shown);
The support plate 3 is located on the front side of the Fresnel lens 28.
1 and is erected on a base 11.

However, the above-mentioned liquid crystal projector 10
According to the xenon lamp 20, the anode terminal 20b
Since the connection line 20d is constructed from a thin flat plate in the form of an elongated strip, the connection line 20d does not cast a shadow as shown in FIG. can be irradiated. Therefore, the image displayed on the liquid crystal display panel 15 can be properly enlarged and projected onto the screen, and a clear image with less influence of shadows can be obtained.

Although the above-described embodiments have been described with reference to the case where the present invention is applied to a liquid crystal projector, the present invention is not limited thereto and can be applied to other devices.

[Effects of the Invention] As explained in detail above, according to the discharge lamp connection structure according to the present invention, the connection wire connected to the electrode terminal of the xenon lamp located on the light irradiation side is made into a thin flat plate. , a good light source is obtained with fewer shadows from the connecting wires in the light of the bulb.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a configuration diagram of a xenon lamp, FIG. 2 is a front view thereof, FIGS. 3A and B are diagrams showing connection lines, and FIG. Figure 5 shows the irradiation state of the xenon lamp.
This figure is a block diagram of a liquid crystal projector, and FIGS. 6 and 7 are diagrams showing conventional examples. 20...Xenon lamp, 20a...Lamp body, 20b...Anode terminal, 20c...Cathode terminal,
20d... Connection line, 21... Reflector.

Claims (1)

[Scope of Claims] 1. An electrode connection structure for a xenon lamp in a light source device including a xenon lamp that generates light by discharging between terminals, and a reflector that reflects the light of the xenon lamp in a predetermined direction, comprising: An electrode connection structure for a xenon lamp, characterized in that a connection wire connected to an electrode terminal of the xenon lamp located on the irradiation side of the lamp is formed into a thin flat plate.