JPH08160420A - Mounting structure of lamp for projecting image - Google Patents

Abstract

PURPOSE: To make possible to fix a metal halide lamp at a prescribed position by inserting the curved part of the rear surface of a parabolic mirror into an aperture by using a leaf spring disposed with the aperture in a central part, then pressing the ambient of the curved part of the parabolic mirror with the inner edge of the aperture. CONSTITUTION: The leaf spring 3 is provided with the aperture 5 of a circular shape of a prescribed size at its central part. The leaf spring 3 is provided with a fixing piece 6 having a detaining hole 7 and a fixing piece 8 having a detaining hole 9 at the opposite two points in the outer peripheral part thereof. An electrode part 4 which is the vertex of the rear surface of the parabolic mirror 2 is inserted into the aperture 5 of the leaf spring 3 and a detaining means 10 disposed at one side face of a casing is passed into the detaining hole 7 of the fixing piece 6 and is fixed to the casing. Similarly, a detaining means 11 disposed at the other side face of the casing is inserted into the detaining hole 9 of the fixing piece 8 and is fixed to the casing. Since the circumference of the curved part on the rear surface of the parabolic mirror 2 is nearly uniformly pressed by the inner edge of the aperture 5, a metal halide lamp 1 is fixed to the prescribed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector, and more particularly to a mounting structure for an image projection lamp such as a metal halide lamp.

[0002]

2. Description of the Related Art As shown in FIG. 3 (A), a conventional metal halide lamp mounting structure for a liquid crystal projector is constructed by bending a wire 23 and engaging portions 25 at both ends.
And 26 are arranged on one side surface of the metal halide lamp 1, the central portion side is passed to the other side surface of the metal halide lamp 1, and the locking portion 27 is also provided on the central portion side.
As shown in (B), the locking parts 25 and 26 are locked to the locking tools 20 provided at two positions on one side plate of the housing 30, and the locking parts 25 and 26 are provided on the other side plate of the housing 30. Locking device 21
The metal halide lamp 1 is fixed to the housing 30 by locking the locking portion 27, and sandwiching both sides of the curved portion on the back surface of the parabolic mirror 2 of the metal halide lamp 1 and pressing with the wire 23.

[0003]

However, the wire 2
In the method of fixing the metal halide lamp 1 to the housing 30 by using 3, the back surface of the parabolic mirror 2 is a curved surface, and the surface of the wire 23 is also smooth. Since the fixing position slips and shifts, it is difficult to fix the metal halide lamp 1 at a predetermined position by moving the mounting position, and there is a problem that a fixing guide is required to fix the metal halide lamp 1 at the predetermined position. The present invention uses a leaf spring having an opening at the center, and inserts a curved portion of the back surface of the parabolic mirror into the opening, and surrounds the curved portion of the parabolic mirror at the inner edge of the opening. By pressing and fixing, the metal halide lamp is fixed in place, the light leaking from the back surface of the parabolic mirror is blocked, and it can also be used as a heat sink for the parabolic mirror. An object is to provide a mounting structure for a lamp.

[0004]

According to a first aspect of the present invention, in a mounting portion of an image projection lamp of a liquid crystal projector, a circular opening having a predetermined size is provided at a central portion, and a fixing piece is provided at an outer peripheral portion. Providing at least two leaf springs,
The parabolic mirror on the back side of the parabolic mirror is inserted into the opening, and the fixing piece is locked by a locking tool provided on the side plate of the housing, and the parabolic mirror of the parabolic mirror is attached to the inner edge of the opening. It is characterized in that the image projection lamp is fixed to the housing by pressing around the curved portion on the back surface. According to a second aspect of the present invention, the fixing piece of the leaf spring and the locking tool provided on the side plate of the housing are provided with a locking hole on one side and a hook-shaped fixing portion on the other side. It is characterized in that it is locked and fixed through the hook-shaped portion of the fixing portion in the locking hole.

According to a third aspect of the present invention, the width of the leaf spring covering the curved portion of the back surface of the parabolic mirror is set to a predetermined size to block light leaking from the back surface of the parabolic mirror. Is characterized by. A fourth invention of the present application is characterized in that the width and the thickness of the leaf spring are set to predetermined dimensions to increase the heat capacity of the leaf spring so that the leaf spring also serves as a heat radiating plate.

[0006]

As described above, according to the present invention, a circular opening having a predetermined size is provided in the central portion of the leaf spring, and fixing pieces are provided at least at two positions on the outer peripheral portion, and the parabolic surface is provided in the opening. Through the apex of the back surface of the mirror, the fixing piece is locked to a locking tool provided on the side plate of the housing to fix the image projection lamp to the housing. Since the periphery can be pressed almost uniformly by the inner edge of the opening provided at the center of the leaf spring, the image projection lamp can be fixed at a predetermined position. Further, with respect to the fixing piece of the leaf spring and the locking tool provided on the side plate of the housing, a locking hole is provided on one side and a hook-shaped fixing portion is provided on the other side, and the locking hole is provided with It is designed to be locked through the hook-shaped part of the fixed part. Therefore, the plate spring fixed to the housing presses the periphery of the curved part of the parabolic mirror to fix the image projection lamp. It becomes possible.

Further, by making the width of the leaf spring covering the curved portion of the back surface of the parabolic mirror to be a predetermined size, the light leaking from the back surface of the parabolic mirror is blocked and the device of the liquid crystal projector is protected. Unnecessary light leakage from the main body can be prevented, and the size and thickness of the leaf spring are set to predetermined values to increase the heat capacity of the leaf spring, so that the parabolic surface passes through the inner edge of the opening of the leaf spring. It is possible to reduce the temperature of the parabolic mirror by transmitting the heat of the mirror to the leaf spring, and thus it is possible to exert the effect as a heat dissipation plate for the parabolic mirror.

[0008]

1 is an enlarged perspective view showing an embodiment of a mounting structure for an image projection lamp according to the present invention, and FIG. 2 is a plan view of the leaf spring shown in FIG. Examples will be described below with reference to FIGS. 1 and 2. The metal halide lamp 1 is arranged downward inside the liquid crystal projector, and the emitted light is projected on the screen through a total reflection mirror, a liquid crystal panel, a projection lens and the like to display an image. The metal halide lamp 1 is attached by a leaf spring 3 to a housing 30 for fixing as shown in FIG.
A circular opening 5 of a predetermined size is provided at the center of
Fixing pieces 6 and 8 are provided at at least two positions on the outer peripheral portion of the leaf spring 3 facing each other.
And a fixing hole 8 is provided with a locking hole 9.

An electrode portion 4, which is the apex of the back surface of the parabolic mirror 2, is passed through the opening 5 of the leaf spring 3, and a hook-shaped member provided on one side plate of the housing 30 shown in FIG. The stopper 10 is passed through the locking hole 7 of the fixing piece 6 and fixed to the housing 30, and the locking tool 11 formed in the hook shape provided on the other side plate of the housing 30 is fixed to the fixing piece 8. It is fixed to the housing 30 through the locking hole 9. If the fixing position of the fixed piece 6 and the fixed piece 8 is set lower than the contact portion between the opening 5 and the parabolic mirror 2, the circumference of the curved portion on the back surface of the parabolic mirror 2 is substantially even at the inner edge of the opening 5. The metal halide lamp 1 can be fixed at a predetermined position because it can be pressed.

A dichroic film is vapor-deposited on the curved portion of the parabolic mirror 2 so that the dichroic film transmits ultraviolet rays and reflects visible rays. Light leaks and is emitted. The leaf spring 3 is provided with a circular opening 5 inside, but the outer peripheral portion is also formed in a substantially circular shape to form a ring shape, and the width of the ring-shaped portion of the leaf spring 3 is set to a predetermined size. Thus, it is possible to cover the curved portion of the back surface of the parabolic mirror 2, and thus it is possible to block the light leaking from the back surface of the parabolic mirror 2.

Furthermore, if the width of the ring-shaped portion of the leaf spring 3 is set to a predetermined size and the thickness of the leaf spring 3 is set to a predetermined thickness, the heat capacity of the leaf spring 3 can be increased. The parabolic mirror 2 is formed through the inner edge of the opening 5 of the leaf spring 3.
It is possible to reduce the temperature of the parabolic mirror 2 by transmitting the heat of the plate spring 3 to the plate spring 3. Therefore, it is possible to cause the plate spring 3 to exert an effect as a heat dissipation plate, and the back surface of the parabolic mirror 2 It is possible to provide a margin in the thermal design of the low-voltage side electrode portion 12 provided in the.

[0012]

As described above, according to the present invention,
Using a leaf spring with an opening in the center, pass the vertex of the back surface of the parabolic mirror of the metal halide lamp through the opening and press the circumference of the curved part of the parabolic mirror almost evenly with the inner edge of the opening. Therefore, it is possible to fix the metal halide lamp at a predetermined position, and the width of the leaf spring that covers the curved part on the back surface of the parabolic mirror must be a predetermined size. This makes it possible to block light leaking from the back surface of the parabolic mirror and prevent unnecessary light leakage from the device main body of the liquid crystal projector. Further, the size and thickness of the leaf spring are set to predetermined dimensions. By increasing the heat capacity of the spring, it becomes possible to transfer the heat of the parabolic mirror to the plate spring through the inner edge of the opening of the leaf spring and lower the temperature of the parabolic mirror. Effective as a heat sink against Image mounting structure of a projection lamp capable to be able to provide.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view showing an embodiment of a mounting structure for an image projection lamp according to the present invention.

FIG. 2 is a plan view of the leaf spring shown in FIG.

FIG. 3 is an explanatory view showing a mounting structure of a conventional image projection lamp.

[Explanation of symbols]

 1 Metal halide lamp 2 Parabolic mirror 3 Leaf spring 4 Electrode part 5 Opening part 6 Fixing piece 7 Locking hole 8 Fixing piece 9 Locking hole 10 Locking tool 11 Locking tool 12 Electrode section

Claims (4)

[Claims] 1. A mounting portion for an image projection lamp of a liquid crystal projector, wherein a circular opening of a predetermined size is provided in a central portion, and a leaf spring having a fixing piece at at least two locations on an outer peripheral portion is provided, The parabolic mirror on the back side of the parabolic mirror is inserted into the opening, and the fixing piece is locked by a locking tool provided on the side plate of the housing, and the parabolic mirror of the parabolic mirror is attached to the inner edge of the opening. A mounting structure for an image projection lamp, characterized in that the image projection lamp is fixed to a housing by pressing around the curved portion on the back surface. 2. The fixing piece of the leaf spring and the locking tool provided on the side plate of the housing are provided with a locking hole on one side and a hook-shaped fixing portion on the other side, and the locking is performed. 2. The mounting structure for an image projection lamp according to claim 1, wherein the fixing portion is locked by being inserted into a hole through a hook-shaped portion of the fixing portion. 3. The light leaking from the back surface of the parabolic mirror is shielded by setting the width of the leaf spring covering the curved portion of the back surface of the parabolic mirror to a predetermined size. Item 1. An image projection lamp mounting structure according to item 1. 4. The leaf spring is set to have a predetermined width and thickness to increase the heat capacity of the leaf spring so as to serve also as a heat radiating plate for the parabolic mirror. Image projection lamp mounting structure.