JPH02141077A - Optical coupling device - Google Patents

Abstract

PURPOSE:To improve the reliability of liquid leak prevention by providing a coupling frame to fit to the face of a projector tube and packing. CONSTITUTION:In an optical coupling device to fill a coolant between a project tube 11 and an optical substance and to link the projector tube and the optical substance, a coupling frame 13 and packing 14 are provided. The coupling frame 13 shapes metal approximately to a quandrangle, forms a recess 15 to fit through the packing 14 to the projector tube 11 on one surface, and forms a fitting surface to fit to a lens 12 on the other surface. Further, the packing 14 is a mold obtained by forming an elastic member to approximately the quandrangle so as to fit to the recess 15, plural positioning projections 20 are protruded on the respective sides of the quandrangle, and a core metal 17 are insertion-molded to the elastic member. Thus, only by attaching the packing 14 to the coupling frame 13, a sealing part is attached to a prescribed position, the projector tube 11 is positioned, and liquid-tightness can be made complete.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an optical coupling device for mounting an optical system in front of a projection tube in a projection television receiver.

(Prior Art) A projection television receiver using a picture tube or liquid crystal light valve has a lens made of glass or the like molded in front of the picture tube as a projection light source.

An optical object such as a bulb is arranged, and the image light beam transmitted through this optical object is projected onto a screen either directly or after being refracted.

Due to the nature of the projection tube as a light source, projection television receivers (G1) require extremely high brightness compared to general pre-vision television receivers. It is becoming common practice to cover the face with a liquid and place heat dissipation fins around it to cool the face. Dramatically improve

FIG. 4 shows an example of a conventional optical coupling device. In FIG. 4, 71 is a projection tube, 72 is a lens,
73 is a coupling frame, and the coupling frame 73 connects the projection tube 71 and the lens 72 through packings 74 and 75, respectively, while maintaining liquid tightness. The liquid chamber 76 formed by this coupling frame is filled with a cooling liquid. The cooling liquid is poured into an injection hole 77 in an injection hole forming metal fitting 81 that is configured separately from the coupling frame 13.
Form and inject.

Further, a diaphragm 78 is attached to the injection hole forming fitting 81 to regulate the pressure of the coolant. Diaphragm 78 is covered by cover 80
Fix it with. The injection hole 77 is closed with a screw 79 after being filled with the coolant. The chamber formed by the coupling frame 73 to which the diaphragm 78 is attached and the injection hole forming fitting 81 is called a bubble reservoir. The reason for providing such a bubble reservoir is to ensure a necessary amount of liquid since the amount of liquid increases or decreases due to changes in humidity. Note that the injection hole forming metal fitting 81 is attached to the packing 82.
It is fastened to the coupling frame 73 via.

FIGS. 5, 6, and 7 are explanatory diagrams showing details of the packing 74 for achieving liquid tightness with the projection tube 71. FIG.

FIG. 5 is an enlarged sectional view of FIG. 4. The state of the packing 74 is shown after the coupling frame 73 is fastened to the face surface of the projection tube 71 with screws or the like. The coupling frame 73 has a recess 8 that fits into the outer peripheral part of the face surface.
3, a positioning protrusion 84 for positioning the projection tube 71;
A recess i85 for positioning the packing 74 is formed in accordance with the ring shape of the rose ring 74.

The packing 74 includes a sealing portion 74a having a circular cross section and bulging into the groove 85, and a flat portion 74b projecting flatly outward from the sealing portion 74a.

As can be seen from FIG. 6, the center of the seal portion 74a and the center of the flat portion 74b do not coincide, and the groove 85
The seal portion 74a is enlarged toward the groove 85 in accordance with the depth of the groove 85.

Then, as shown in FIG. 7, the packing 74 is arranged so that the small hemispherical part P1 of the sealing part 74a comes into contact with the face surface of the projection tube 71, and the large hemispherical part P2 of the sealing part 74a fits into the groove 85. Take f size.

According to such a configuration, in the state before the coupling frame 73 is fastened to the projection tube 71, the flat portion 74
b and the face surface S1, and the distance 1fll T2 between the flat portion 74b and the bottom surface S2 of the recess 83 are approximately equal, and when the coupling frame 73 is tightened to the projection tube 71, the distance M ( TI, T2).
1 with a predetermined pressure to achieve liquid tightness. Note that the thickness of the flat portion 74b is equal to the thickness of the bottom surface S of the recessed portion 83.
2 and the face surface S1 is determined to be a distance of 1111it.

However, when the above-mentioned packing 74 is fitted into the groove 85 with the seal part 74a of the coupling frame 14, the packing 74 is arranged in the opposite direction, that is, the large hemispherical part P2 is moved toward the face surface S1, and the small hemispherical part P1 is inserted into the groove 85. In some cases, it may fit into the groove 85 side.

- Since the banking 74 has elasticity, it may be attached to the groove 85 while being deformed. In such a case,
The liquid tightness provided by the seal portion 74a is impaired, causing liquid leakage, and the gap t between the coupling frame 73 and the projection tube face cannot be set as specified.

(Problem to be Solved by the Invention) A coupling device for coupling an optical object to the face surface of a projection tube via a coupling frame has conventionally employed a method in which an elastic packing is fitted into a recess dIIi 85 formed in the coupling frame 73. By doing this, we ensured the adhesion of the packing and also positioned it, so there was no dent! Yes 8
I made a mistake between the raw ball side (P2) that fits on the 5 and the hemisphere side (Pl) that fits on the face, and recessed the small hemisphere part P1.
This has the disadvantage of causing work errors, such as fitting in the wrong position or being deformed due to friction with the bottom of the recess and not being fitted in the correct position.

For this reason, there was a problem in that the reliability of liquid tightness was impaired.

The present invention aims to eliminate the above-mentioned problems, and to provide an optical coupling device that prevents incorrect orientation and deformation due to work errors when attaching to a coupling frame, and provides perfect liquid tightness. do.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an optical coupling device that connects the projection tube and the optical object by filling a cold IJI liquid between the projection tube and the optical object. The present invention is characterized in that it includes a coupling frame that fits onto the face surface of the projection tube, and a packing in which a core metal is integrated with a seal portion that is in close contact with the face surface.

(Function) According to such a configuration, by simply attaching the packing to the coupling frame, it is possible to attach the seal portion to a prescribed position and position the projection tube.

(Example) The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 is an exploded perspective view illustrating an embodiment of an optical coupling device according to the present invention, and FIG.
FIG. 3 is an explanatory view for explaining the operation of the embodiment shown in FIG. 1.

In FIG. 1, 11 is a projection tube, 12 is a lens, 13 is a coupling frame, 14 is a packing that achieves liquid tightness with the projection tube 11, and the lens 12 is a packing 4.
8 maintains liquid tightness (see Figure 3).

First, the coupling frame 13 has a structure similar to that of the device shown in FIG. That is, the coupling frame 13
is made of metal with good thermal conductivity and is molded into a substantially rectangular shape.
5 is formed on one surface, and a fitting surface for fitting the lens 12 is formed on the other surface. The recess 15 has a lens hole 42 corresponding to the lens 12 in the center with a step 41 interposed therebetween.

In addition, the coupling frame 13 has an air bubble reservoir 40 above.
Configure.

The bubble reservoir 40 is fixed to the opening 43 on the side of the coupling frame 13 by a cover 46 with an injection hole forming fitting 44 and a diaphragm 45 sandwiched therebetween. Injection hole 47
is formed on the flat part of the injection hole forming fitting 44 in the vicinity of the diaphragm 45.

Next, the packing 14 is a molded product made of an elastic material formed into a substantially rectangular shape so as to fit into the recess 15, and has a plurality of positioning protrusions 20, 20... protruding from each side of the rectangle. , the core bar 17 is insert molded into an elastic material. As shown in FIG. 2(a), the elastic material has a flat part 18 protruding from the outer periphery of the circularly expanded seal part 19, and the center of the seal part 19 and the center of the flat part 18 are different from each other. Match. Positioning protrusion 20
．． 20... extend from the flat part 18 with the same thickness, and rise at an angle slightly wider than a right angle in the middle. This rise approximately corresponds to the width of the side surface of the recess 15.

In the case of this embodiment, the positioning protrusions 20 facing each other in, for example, the left-right direction in FIG.

The core metal 17 is slightly exposed from the center of the flat portion 18. However, as shown at 17' in FIG. 2(b), it also protrudes into the positioning projection 20 that coincides with the flat portion 18.

According to the optical coupling device configured as described above, as shown in FIG. 3, the seal portion 19 is crushed by the face surface of the projection tube 11 and the concave bottom surface of the coupling frame 13, thereby creating a liquid-tight state. In addition, the distance between the projection tube 11 and the coupling frame 13, that is, the distance t between the face surface and the concave bottom surface, is set by the thickness of the flat portion 18.

Therefore, the positioning of the packing 14 is as follows:
This can be done by simply fitting the packing 14 into the recess 15. That is, when the para 4 ring 14 is fitted into the recess 15, the positioning protrusion 20 is guided by the side surface of the recess (toward the projection 16 in the left-right direction). In this case, the seal portion 19.
Since the core metal 11 is inserted into the flat part 18 and a part of the positioning protrusion 2o, the positioning protrusion 2o is guided by the concave bottom surface, and the rising part 20' is pushed inward by elasticity. , the seed portion 19 can be correctly positioned around the step 41.

Moreover, the packing 14 does not come off due to the elastic force of the positioning protrusion 20.

When the projection tube 11 is fixed with the packing 14 attached as described above, the positioning protrusion 20 regulates the position of the projection tube 11, and the projection tube 11 is placed in the center of the lens 12.
The projection tube 11 can be fixed in a state where the center of the projection tube 11 is aligned.

According to the packing 14 having such a configuration, there is no possibility of mistakes in the mounting direction. Therefore, the reliability of packing is further improved, and liquid leakage accidents can be reduced. Further, there is no need to provide a groove 85 (see FIG. 5) for positioning the seal portion 19, and the shape of the mold becomes simple.

Further, the positioning protrusion 20 and the protrusion 16 on the side of the recess are not necessarily necessary; for example, the positioning protrusion 20 is
It may be a shape that protrudes only in the same direction as 8.

[Effects of the Invention] As explained above, according to the present invention, there is an effect that the reliability of preventing liquid leakage is high.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of an optical coupling device according to the present invention, FIG. 2 is a cross-sectional view and a plan view for explaining the embodiment of FIG. 1 in detail, and FIG. FIG. 4 is an explanatory diagram showing the conventional optical coupling device. FIGS. 5, 6, and 7 are explanatory diagrams explaining the device in FIG. 4 in detail. It is a diagram. 11... Projection tube, 12... Lens, 13... Coupling frame, 14... Packing, 15...
Recess, 16... Protrusion, 17... Core bar, 18... Flat part, 19... Seal part, 20... Positioning protrusion. Agent Patent Attorney Susumu ItoFigure 4

Claims (1)

[Scope of Claims] An optical coupling device that connects the projection tube and the optical object by filling a space between the projection tube and the optical object, comprising: a coupling frame that fits onto a face surface of the projection tube; An optical coupling device comprising: and a packing in which a core metal is integrated into a seal portion that is in close contact with the face surface.