JPH02270258A - Xenon lamp electrode connection structure - Google Patents

Abstract

PURPOSE:To form good light source with less shadow of a connection wire such as a lead wire by forming the connection wire which is located at least in a bulb light irradiated direction and connected to a bulb in a thin plane shape. CONSTITUTION:A connection wire 20d which is connected to an anode terminal 20b on the front side of a reflector 21, or the light irradiate side, is thin and plane in a slender and band shape and formed in an almost (L) shape. It has one end tubularly bent and fitted to the anode terminal 20b and the other end connected to a lead wire 20f which is connected to a lamp power source 24 and also the thin thickness arranged along a light irradiated direction. It is thus possible to obtain good light source with less shadow of the connection wire for bulb light.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a connection structure for a light bulb.

[Prior art and its problems] In general, a liquid crystal projector uses a transmissive liquid crystal display panel to display an image on a television or the like, and then enlarges and projects the displayed image onto a screen. A xenon lamp is provided at the rear as a light source, and a projection lens is provided at the front to enlarge and project the image displayed on the liquid crystal display panel.

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

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 FIG.
There was a problem in that the image displayed on the screen could not be projected well onto the screen.

[Object of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a light bulb connection structure that can realize a good light source with less shadows from connection wires such as lead wires. There is a particular thing.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention is such that the connecting wire connected to the light bulb, which is located at least in the light irradiation direction of the light bulb, is formed into a thin flat plate shape.

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

FIG. 5 shows a liquid crystal projector. This liquid crystal projector 10 has a liquid crystal display unit 12, a light source unit 13, etc. on a base 11. It is equipped with a lens unit 14, etc., so that the screen of the liquid crystal display unit 12 is irradiated with light by a light source unit 13, and the image displayed on the liquid crystal display unit 12 is enlarged and projected onto a screen (not shown) by the lens unit 14. It has become.

The liquid crystal display unit 12 displays images on a television or the like, and includes a liquid crystal display panel 15 and a drive circuit board 16.
It consists of The liquid crystal display panel 15 is a TN type (twisted nematic) transmissive type capable of color display, and has a large number of electrodes in a matrix.
It is erected approximately near the center of the base 11, and is connected to the drive circuit board 16 to display images.

In this case, heat pipes 17 and 17 for cooling are attached to the liquid crystal display panel 15. This heat pipe 17.17 cools the liquid crystal display panel 15, and protrudes upward, and its tip is bent toward the back side (right side in the figure), and a heat dissipation fin 17 is attached to this bent portion.
a...Φ is installed. On the other hand, the drive circuit board 16
is a drive circuit section 16a, 1 that drives the liquid crystal display panel 15.
6b on the upper and lower sides, it is installed upright near the liquid crystal display panel 15, and each drive circuit section 16a, 16b is connected to a scanning electrode and a 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 arranged under the base 11 and is connected to a receiving unit (not shown) equipped with a television radio wave receiving circuit, an audio amplification circuit, a speaker, etc. It is designed to give a signal.

The light source unit 13 irradiates the Koto liquid crystal display panel 15 from the front side of the liquid crystal display unit 12, and includes a xenon lamp 20, a reflector 21, a light guide pipe 22, a heat ray absorption filter 23, and the like. xenon lamp 2
0 is the lamp body 20a as shown in FIGS. 1 to 4.
An anode terminal 20b and a cathode terminal 20c are arranged inside the lamp body, and light is generated by causing a discharge between these electrodes.The center of the lamp body 20a is the center of the paraboloid of the reflector 21 (
The cathode terminal 20c side is attached to the reflector 21, and each electrode terminal 20b, 2
0c are connected to the lamp power supply 24 through connection lines 20d and 20e, respectively. In this case, the tangential bA line 20d connected to the anode terminal 20b on the front side of the reflector 21, that is, the side to which light is irradiated, is a thin flat plate in the shape of an elongated strip,
It has an "L" shape, one end of which is bent into a tubular shape and attached to the anode terminal 20b as shown in FIG. 3, and the other end is connected to a lead wire 20f connected to the lamp power source 24. In addition, as shown in FIG. 2, the thin wall thickness direction is arranged along the light irradiation direction. Note that the cathode terminal 20e is just a lead wire, and the lamp power supply 24
It is connected to the.

Further, the reflector 21 of the light source unit 13 reflects the light generated by the xenon lamp 20, as shown in FIG.
It irradiates the liquid crystal display panel 15 with parallel light through the light guide pipe 22 and the heat ray filter 23, and has a parabolic reflecting mirror, which is placed at one end of the light guide pipe 22. Along with the light pipe 22, the back side of the base 11 (
It is attached to a support plate 25 erected (on the right end side in FIG. 5). The light guide pipe 22 guides light to the heat ray absorption filter 23, and has a cylindrical shape, the inner surface of which is a reflecting mirror, and the upper surface on the xenon lamp 20 side has a heat radiation hole 22.
a is formed, and an opening 22b is formed on the lower surface of the front side (heat ray absorption filter 23 side), and this opening 2
A cooling fan 26 is provided below 2b. This fan 26 feeds and circulates cooling air into the light guide pipe 22, and radiates the heated air through the heat radiation holes 22a. The heat ray absorption filter 23 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. has been done.

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 includes a Fresnel lens 28 and a projection lens 29. Fresnel lens 28 is connected to liquid crystal display panel 15
It condenses the light that has passed through it in the vertical direction,
It is located on the front side of the liquid crystal display panel 15, is attached to a support plate 30, and is erected on the base 11. Projection lens 2
9 is a screen (
(not shown), is located on the front side of the Fresnel lens 28, is attached to a support plate 31, and is erected on a base 11.

However, according to the liquid crystal projector 10 (7) and xenon lamp 20 as described above, the connection M1 of the anode terminal 20b
Since 20d was constructed from a thin flat plate in the form of an elongated strip, the fourth
As shown in the figure, the connection line 20d does not cast a shadow, and the liquid crystal display panel 15 can be properly irradiated with the generated light and the light reflected by the reflector 21. 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.

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

[Effect of the invention 1] As explained in detail below, according to the connection structure for a light bulb such as a xenon lamp according to the present invention, at least the connection wire connected to the light bulb located in the light irradiation direction of the light bulb is connected to a thin flat plate. Because it is shaped like this, there are few shadows from the connecting wires in the light from the bulb, providing a good light source.

[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, and FIG.
Figures (A) and (B) are diagrams showing connection lines, Figure 4 is a diagram showing the irradiation state of a xenon lamp, Figure 5 is a configuration diagram of a liquid crystal projector, and Figures 6 and 7 are diagrams showing a conventional example. It is. 20...Xenon lamp, 20a...
Lamp body, 20b...Anode terminal, 20c...
...Cathode terminal, 20d... Connection wire, 21.
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Claims (1)

[Scope of Claim] A connection structure for a light bulb, characterized in that a connection line connected to the light bulb, located at least in the direction of light irradiation from the light bulb, is formed into a thin flat plate shape.