JPH1062869A - Light source device for liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reversely reattach the light source lamp box of a front face projection type liquid crystal projector used both for installation/hanging from the ceiling upside down in accordance with an installation condition. SOLUTION: A reflector 2 is attached at the center of a lamp box 1, and a metal halide lamp 3 is attached so as to align the center of light emission with an optical axis. Connector mounting brackets 5 and 5' are provided at a symmetrical position to the diagonal line of the front face of the lamp box on the upper surface and the lower surface of the lamp box, and a connector 4 at the top end of the power source connection line of a lamp is replaced from the connector mounting brackets 5 to 5' or in a reverse way. A recessed line 11 is longitudinally formed on the rear face of the lamp box, and the power source connection line pulled out from a hole 12 is passed to the upper surface or the lower surface of the lamp box through the recessed line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device for a liquid crystal projector, and more particularly to a device for easily changing a light source in a case where a stationary installation is switched to a ceiling hanging installation or vice versa.

[0002]

2. Description of the Related Art As shown in a side view of FIG. 5, a metal halide lamp used as a light source of a liquid crystal projector device or the like has electrodes 41 and electrodes 42 opposed to each other at an interval of about several millimeters in a metal halide lamp 3. Although the light is emitted by arc discharge between the electrodes, the heat generated by the emission raises the temperature in the metal halide lamp 3 and generates heat convection, which causes a temperature difference between the upper and lower portions, resulting in an uneven gas concentration distribution. result,
As shown in the figure, the arc 43 bends upward, and the center 44 of light emission shifts above the center 45 of the metal halide lamp. For this reason, when the metal halide lamp is mounted on the reflector, it is mounted so that the light emission center 44 is located at the center position of the reflector (the axis of the optical system = optical axis). However, when the liquid crystal projector device is used for both installation and hanging from the ceiling, the direction of the arc is upside down because the metal halide lamp is turned upside down depending on how it is installed.For example, it is best in the case of installation. When the lamp is adjusted to be suspended from the ceiling, the brightness is lowered or the brightness becomes uneven. Therefore, it is necessary to adjust the position of the metal halide lamp depending on the installation method.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been made so that a lamp box incorporating a metal halide lamp, a reflector, and the like can be mounted upside down on a chassis. An object of the present invention is to make it easy to cope with any of the installations.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a light source device of a front projection type liquid crystal projector for both installation and hanging from a ceiling. A light source for a liquid crystal projector in which a metal halide lamp is arranged horizontally and a connector mounting portion for mounting a connector for connecting the metal halide lamp to a power supply is vertically symmetrical so that a lamp box can be arbitrarily mounted upward or downward. An apparatus is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a light source device for a liquid crystal projector according to the present invention, a metal halide lamp is horizontally arranged on a reflector, mounted in a lamp box, the outer shape of the lamp box is formed in a rectangular box shape, and a connector mounting bracket is provided. (Connector mounting part) is provided at a position symmetrical with respect to the diagonal line on the front of the lamp box, and the connector of the power supply connection line for connecting the metal halide lamp to the power supply can be replaced on the upper or lower surface of the lamp box. Upside down so that it can be mounted on the chassis.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a light source device for a liquid crystal projector according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a main part of an embodiment of a light source device of a liquid crystal projector according to the present invention, FIG. 2 is a plan view of a main part, (a) is a front view,
(B) is a side view, and (c) is a rear view.

In FIG. 1, 1 is a lamp box, 2 is a reflector, 3 is a metal halide lamp, 4 is a connector, 5 is a connector mounting bracket, and 6 is a power supply connection line of the metal halide lamp 3. The reflector 2 is mounted on the center of the lamp box 1, and the metal halide lamp 3 is mounted on the reflector 2 so that the center of light emission coincides with the optical axis. The lamp box 1 has a rectangular box shape, and connector mounting brackets 5 and 5 'are provided on the upper and lower surfaces of the lamp box 1 at positions symmetrical with respect to the front diagonal as shown in FIG.
For example, in the case of the stationary installation, the connector 4 is attached to the connector mounting bracket 5, and in the case of the ceiling hanging installation, the connector 4 is replaced with (4 ') as indicated by a dotted line on the connector mounting bracket 5' side. It is mounted upside down on a chassis (not shown). In the drawing, an example is shown in which the connector mounting brackets are provided at the center positions of the upper surface and the lower surface of the lamp box 1, respectively. May be mounted symmetrically to the right.

[0008] A concave groove 11 is formed at substantially the center of the rear surface of the lamp box 1 (shown at C in FIG. 2).
A power connection line of the metal halide lamp 3 is drawn out from the hole 12, and the connector 4 attached to the tip is connected to the connector mounting bracket 5 (for stationary installation) or the connector mounting bracket 5 '(for ceiling hanging installation). Attach) with screws.

FIG. 3 is a front view of a main part of another embodiment of the light source device of the liquid crystal projector according to the present invention.
Is formed in an octagonal box shape when viewed from the front, and connector mounting brackets 22 and 22 'are provided at symmetrical positions. For example, in the case of stationary installation, the connector 4 is mounted on the left side connector mounting bracket 22. In the case of mounting and hanging from the ceiling, the connector 4 is mounted on the connector mounting bracket 22 'on the right side as shown by a dotted line (4'), and the lamp box 21 is turned upside down and mounted on a chassis (not shown). Alternatively, connector fittings are provided on the upper and lower surfaces of the lamp box 21 (not shown), and the connectors are replaced according to whether the lamp box 21 is installed on a ceiling or suspended from the ceiling. You may make it attach.

FIG. 4 is a rear view of a main part of another embodiment of the light source device of the liquid crystal projector according to the present invention.
Connector mounting bracket at a position symmetrical with respect to the diagonal line on the back of
31 and 31 'are provided. For example, in the case of the stationary installation, the connector 4 is attached to the connector mounting bracket 31, and in the case of the ceiling hanging installation, the connector 4 is attached to the connector mounting bracket 31' as shown by a dotted line (4 '). The lamp box 1 is mounted upside down on a chassis (not shown).

[0011] As described above, the lamp box can be kept upright when the liquid crystal projector is installed, regardless of whether the liquid crystal projector is installed or suspended from the ceiling. It can be used with the center of light emission aligned with the optical axis, and does not cause problems such as uneven brightness of the projected image or a decrease in brightness.

[0012]

As described above, according to the light source device of the liquid crystal projector according to the present invention, the lamp box can be easily moved up and down depending on whether the liquid crystal projector device is installed stationary or suspended from the ceiling. It can be replaced on the contrary, and is useful when used for both stationary installation and ceiling hanging installation.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a light source device of a liquid crystal projector according to the present invention.

FIG. 2 is a plan view of a main part of FIG. 1, (a) is a front view, (b)
Is a side view, and (c) is a rear view.

FIG. 3 is a main part front view of another embodiment of the light source device of the liquid crystal projector according to the present invention.

FIG. 4 is a main part rear view of another embodiment of the light source device of the liquid crystal projector according to the present invention.

FIG. 5 is a diagram for explaining a shift of a center of light emission of a metal halide lamp.

[Explanation of symbols]

 1, 21 Lamp box 2 Reflector 3 Metal halide lamp 4 Connector 5, 5 ', 22, 22', 31, 31 'Connector mounting bracket 6 Power connection line 11 Concave strip 12 holes (for drawing out power connection line)

Claims (5)

[Claims] In a light source device for a front projection type liquid crystal projector for both stationary and ceiling hanging, a reflector is mounted at the center of a lamp box, and a metal halide lamp is arranged in a horizontal lighting manner in the reflector, and a power source is supplied to the metal halide lamp. A light source device for a liquid crystal projector having a vertically symmetrical connector mounting portion for mounting a connector to be connected to a liquid crystal projector so that a lamp box can be arbitrarily mounted upward or downward. 2. The light source device for a liquid crystal projector according to claim 1, wherein the outer shape of the lamp box is formed in a rectangular box shape, and the connector mounting portion is provided at a vertically symmetric position with respect to a diagonal line in front of the lamp box. 3. An outer shape of the lamp box is formed in an octagonal box shape, and the connector mounting portion is provided vertically symmetrically or horizontally symmetrically when viewed from the front of the lamp box, and the lamp box is directed upward, downward, rightward, or leftward. 2. A light source device for a liquid crystal projector according to claim 1, wherein the light source device can be arbitrarily mounted. 4. A concave portion for passing a power supply line of the metal halide lamp is formed on the back surface of the lamp box, and a hole for drawing out a power supply line of the metal halide lamp is provided in the middle of the concave portion. The light source device for a liquid crystal projector according to claim 1, 2, or 3. 5. The light source device for a liquid crystal projector according to claim 1, wherein the connector mounting portion is provided at a position symmetrical with respect to a diagonal line on a rear surface of the lamp box.