JPH05224293A - Projecting optical device and method for assembling this device - Google Patents

Abstract

PURPOSE:To enable accurate assembly without deforming an incident lens even if the flatness of a bracket and the thickness distribution of the lens exist by sealing liquid into a sealing material for liquid-tightly fixing the incident lens and the bracket. CONSTITUTION:The O-ring shaped sealing material 7 is inserted into the groove of the bracket 2 made of an aluminum die casting. The incident lens 5a made of plastic is placed thereon and further, an incident lens retaining plate 8 is placed thereon and is fastened and fixed to the bracket 2 by means of a screw 10 for retaining the incident lens. The sealing material 7 is constituted of a flexible material and the gas or liquid is sealed into the hollow part 25 thereof. The sealing material 7 is deformed according to the depth of the groove and the thickness size of the rim of the incident lens 5a even if accuracies of these sizes are poor and the incident lens 5a is built into the bracket 2 with the good accuracy if the fluid is sealed into the sealing material in such a manner. The fluid to be sealed into the sealing material 7 is preferably silicone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection optical apparatus used in a projection television, and more particularly to preventing plastic lens from being attached and deformed and improving the attaching accuracy to reduce deterioration of optical performance and always maintain high performance. The present invention relates to a projection optical device and a method of assembling the projection optical device.

[0002]

2. Description of the Related Art In a projection apparatus for a projection television, as described in Japanese Utility Model Laid-Open No. 62-30201, the projection tube is made to have a high output in order to improve the brightness, and the heat generated thereby causes the projection tube to move. To prevent damage, the projection tube is cooled with a cooling liquid.

In this system, a lens closest to the projection tube (hereinafter referred to as an entrance lens) and the projection tube are arranged to face each other, and there is a bracket for enclosing a cooling liquid. This bracket also has a role of radiating the heat generated from the projection tube.

The bracket is manufactured by die casting of aluminum, which has a high thermal conductivity, in order to increase the heat dissipation ability.

In order to prevent the leakage of the cooling liquid, the bracket and the projection tube, and the bracket and the incident lens are fixed by tightening screws through various parts such as a holding plate and an O-ring.

FIG. 8 is a sectional view of an embodiment of a fixed portion of the bracket and the projection tube. 2 is a bracket, 5a is an incident lens, 7'is an O-ring, 8 is an incident lens pressing plate, 9 is an incident lens pressing washer, and 10 is an incident lens pressing screw. The bracket 2 is provided with a groove 2b for the O-ring 7.

The O-ring 7 is inserted into the groove 2b of the bracket 2, the incident lens 5a is placed on the groove, and the incident lens pressing plate 8 is further placed thereon. The incident lens pressing screw 10 is inserted through the incident lens pressing washer 9. It is tightened and attached to the bracket 2.

As the incident lens, a plastic lens is generally used in terms of productivity, cost and performance (adopting an aspherical shape).

The plastic lens is disclosed in JP-A-55-259.
Molding is performed by injection molding or injection compression molding using a molding die as described in Japanese Patent No. 73. The molten resin is distributed from the center of the mold to each lens cavity, and each cavity is filled with a side gate.

FIG. 9 is a sectional view of an embodiment of a molding die. 101 is a fixed type, 102 is a movable type, 103 is a spacer block, 104 and 105 are adapter plates, 10
6 is a cavity, 107 is a sprue, 108 is a runner, 1
09 is a gate, 110 is an ejector plate, 113,
Reference numeral 114 is an insert piece, and 115 is a protruding pin.

In molding a plastic lens in FIG. 9, first, a molten resin is injected from a sprue 107 at the center of the mold. The injected resin causes the runner 108,
It is passed through the gate 109 and distributed, and is filled in each cavity 106 by a side gate. Then, the resin is cooled by temperature control (not shown) provided in the fixed mold 101 and the movable mold 102. After the resin is sufficiently cooled, the adapter plates 104, 1 are attached by the protruding rods provided in the injection molding machine.
Via 05, the projecting pin 115 is operated to project and eject the molded lens.

[0012]

In the above-mentioned prior art, no consideration is given to the deterioration of the optical performance of the projection device due to the deformation when the entrance lens is attached to the bracket.

The aluminum die-casting method for manufacturing the above bracket is insufficient in accuracy for use as an optical component. Therefore, as shown in FIG. 10, the flatness of the groove 2b for fixing the entrance lens and incorporating the O-ring for enclosing the cooling liquid is poor. That is, depending on the position, the groove 2b
Depths h ₁ and h ₂ are different.

On the other hand, as shown in FIG. 11, the axial symmetry of the thickness of the incident lens is poor and the thickness of the edge portion is not uniform. Generally, the gate side portion t ₁ in the molding die is thick,
The other side t _{2 of the} gate is thin. Before molding, the molding die shown in FIG. 9 is deformed by the pressure of the resin injected and filled during the molding process so that the central portion of the die opens and expands, as shown in FIG. This is because the resin filling amount differs between the central part and the peripheral part of the mold.

FIGS. 13 and 14 show a state in which the above lens is assembled to the above bracket. Since the depth h of the O-ring groove 2b of the bracket 2 and the edge thickness t of the incident lens 5a are different depending on the position, when the incident lens pressing plate 8 is fastened to the bracket 2 with the incident lens pressing screw 10, first, At a position where the depth h of the groove 2b is small or the edge thickness t of the incident lens 5a is thick, the groove 2b, the O-ring 7, the edge of the incident lens 5a and the incident lens pressing plate 8 come into contact with each other and tighten the O-ring 7 with a tightening force. Begins to compress. At that time, as shown in FIG. 13, the groove 2
At a position where the depth h of b is large or the edge thickness t of the incident lens 5a is thin, between the groove 2b, the O-ring 7, the edge of the incident lens 5a and the incident lens pressing plate 8 or the incident lens pressing plate 8 Since there is a gap between the lens pressing washer 9 and the incident lens pressing screw 10, the tightening force does not act on the O-ring 7. The lens is not deformed at this point. However, since there is a portion where the tightening force is not applied to the O-ring 7, the cooling liquid for cooling the projection tube cannot be enclosed in the portion surrounded by the projection tube, the bracket and the incident lens.

Then, further tighten the O-ring 7
When the tightening force that acts on is uniform, the state shown in FIG. 14 is obtained. That is, since the compression amount of the O-ring 7 is the same, a position where the depth h of the groove 2b is large or the incidence lens 5
At a position where the edge thickness t of a is thin, the incident lens 5a and the incident lens holding plate 8 are deformed by the tightening force so as to eliminate the gap. Due to this deformation, the surface shape of the entrance lens 5a loses symmetry.

This built-in deformation of the entrance lens deteriorates the accuracy of the entrance lens, which causes a problem that the optical performance is deteriorated, that is, the image quality is deteriorated.

As a countermeasure against this, it is conceivable to improve the flatness by a mechanization as a post-process after the bracket is manufactured by die casting, but the processing cost becomes high and even if only the bracket is improved, the lens The effect is small unless the thickness distribution of the edge portion is reduced.

Further, it is difficult to align the optical axes of the incident lens and the projection tube, and eccentricity and tilting are likely to occur, resulting in deterioration of performance.

The object of the present invention is to solve the above-mentioned conventional problems, and even if the flatness of the bracket and the thickness distribution of the lens are present, the incident lens can be incorporated with high precision without being deformed, and the high image quality is always maintained. To provide a projection optical device capable of obtaining an image of

[0021]

In order to achieve the above object, in the projection optical apparatus of the present invention, a fluid (gas or gas) is provided inside the sealing material for fixing the bracket and the entrance lens and enclosing the cooling liquid. Liquid) was enclosed, and the pressure of the enclosed fluid was used as the holding force for holding the lens. Here, a flexible material is used for the outer skin of the sealing material. The fluid to be sealed is a fluid at the time of sealing, but it is desirable to use a material that hardens and has a high viscosity after that. In addition, the entrance lens and the projection tube were marked and applied for positioning.

[0022]

When the outer skin of the sealing material is made of a flexible material, the sealing material can be freely deformed and its thickness can be changed depending on the amount of fluid enclosed inside.

The fluid has a constant pressure due to the Bascal principle. Therefore, the fact that the inside of the sealing material is a fluid means that the fluid moves inside the sealing material at a position where the depth h of the groove 2b is naturally small due to the movement of the fluid or a position where the edge thickness t of the entrance lens 5a is thick. At the position where the capacity is small and conversely the depth h of the groove 2b is large or the edge thickness t of the entrance lens 5a is thin, the volume of the fluid inside the sealing material is large, and the sealing material is used to set the groove depth of the bracket and the lens. It can be changed according to the edge thickness. As a result, asymmetrical deformation does not occur even if the amount of compression of the sealing material is the same.

By making the pressure of the fluid inside the sealing material the pressing force of the incident lens, the pressure of the fluid is the same at any position, so that a uniform pressing force can be obtained. The pressure of the fluid can be set to the pressing force of the incident lens by determining the positional relationship of each component before sealing the fluid and finally pressing the lens with the pressure for sealing the fluid.

If the fluid to be sealed inside the sealing material is a fluid of low viscosity, it will gradually leak to the outside of the sealing material over time, so it is necessary to add fluid. On the other hand, if the fluid to be sealed is a fluid with high viscosity, it is difficult to seal. Therefore, by using a material that has a low viscosity at the time of encapsulation and then cures to have a high viscosity, the material can be easily encapsulated and leakage can be prevented.

When the lens and the projection tube are marked, the eccentricity can be easily determined and corrected, so that the assembling accuracy is improved.

[0027]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view showing an embodiment of the projection optical apparatus of the present invention.

In FIG. 1, 1 is a projection tube, 1a is a projection tube pressing plate projection provided on the back surface of the projection tube 1, 2 is a bracket, 2a is a heat-radiating fin provided on the bracket 2, 3 is an outer lens barrel, 4 is an inner lens barrel, 5a, 5b, 5c, 5d are lenses,
Among them, 5a is a lens closest to the projection tube 1, an incident lens, 6 is a bellows attached to the bracket 2, 7 is a sealing material for fixing the bracket 2 and the incident lens 5a in a liquid-tight manner, and 8 is incident with the bracket 2. Incident lens pressing plate for fixing the lens 5a, 9 is an incident lens pressing washer, 10 is an incident lens pressing screw for fixing the incident lens pressing plate 8 to the bracket 2, 11 is a lens barrel holding washer, Reference numeral 12 designates an outer lens barrel holding screw for fixing the outer lens barrel 3 to the bracket 2, 13 a washer for holding the inner lens barrel, 1
Reference numeral 4 denotes an inner barrel holding screw for fixing the inner barrel 4 to the outer barrel 3, 15 and 16 denote lens retainers for fixing the lenses 5b and 5d to the inner barrel 3, and 17 denotes the projection tube 1. A sealing material for liquid-tightly fixing the bracket 2 and the bracket 2, and 18 is the projection tube 1
And a projection tube holding plate for fixing the bracket 2, 19 is an elastic material interposed between the projection tube 1 and the projection tube holding plate 18, 2
Reference numeral 0 is a connecting rod for fixing the bracket 2 and the projection tube holding plate 18, 21 is a connecting rod holding washer, 22 is a connecting rod holding screw, 23 is the projection tube 1, the bracket 2 and the incident lens 5a.
Numeral 24 is a space surrounded by bracket 2 and bellows 6.

A cooling liquid for cooling the projection tube 1 is filled in the gaps 23 and 24.

Here, the seal material 7 is made of a flexible material.

FIG. 1 is an enlarged view of a fixing portion of the bracket 2, the incident lens 5a, the sealing material 7, the incident lens pressing plate 8, the incident lens pressing washer 9, and the incident lens pressing screw 10, which are main parts of the present invention. As shown in FIG. Reference numeral 25 denotes a hollow portion provided in the seal material 7, in which a fluid (gas or liquid) is enclosed.

The incident lens 5a is a plastic lens,
The bracket 2 is manufactured by aluminum die casting. The fluid sealed in the hollow portion 25 of the sealing material 7 was silicone.

A method of assembling the projection optical device having the above structure will be described with reference to FIGS.

First, marking is performed at the center of each of the projection tubes so that the optical axes of the projection tube surface and the incident lens can be easily aligned. Here, the marking of the entrance lens was performed on the surface that is in contact with the cooling liquid, that is, the entrance surface. By matching the marking positions of both when assembling, decentering of the projection tube surface and the incident lens can be prevented. Here, the marking is premised on that the optical performance is not affected even if a light ray passes through the marking portion. The marking may be melted by the cooling liquid.

The projection television uses three projection optical devices, which are divided into red, blue and green. Therefore, red, blue and green markings were made respectively.
In the projection optical device of the projection television, it is preferable that the marking be melted by the cooling liquid because the effect of the filters of the respective colors can be obtained.
Therefore, the marking of the entrance lens was performed on the surface on the side that comes into contact with the cooling liquid.

Next, the incident lens is mounted without deformation and prevented from tilting or falling with respect to the projection tube surface. Here, the incident lens has a distribution in the edge thickness as described above. That is, there is an inclination between the entrance surface and the exit surface of the entrance lens.

Comparing the accuracy required for both surfaces of the entrance lens, high accuracy is required for the exit surface. This is because the surface on the incident side is in contact with the cooling liquid, and since the refractive index of the lens is close to that of the cooling liquid, the refraction of light rays at the interface between the lens and the cooling liquid is very small. This is because there is little influence even if the accuracy is a little poor.

Therefore, the entrance lens is mounted so that the exit surface and the projection tube surface are prevented from tilting.

First, a positioning jig for positioning the projection tube and the incident lens is prepared. An example of the positioning jig is shown in FIGS. The positioning jig is composed of a projection tube positioning jig and an incident lens holding plate height positioning jig.

In FIG. 3, reference numeral 31 is a projection tube positioning jig, 31a is a female screw portion provided on the projection tube positioning jig 31, and a screw portion for fixing the incident lens holding plate height positioning jig, 31b is a projection tube positioning jig. On the surface of the jig 31, the projection tube 1
Reference numeral 32 is a reference surface for positioning with the tube surface 1b, and 32 is a projection tube fixing screw for fixing the projection tube 1 to the projection tube positioning jig 31.

The projection tube positioning jig 3 thus configured
Attach the projection tube 1 to 1. At that time, the projection tube surface 1b is attached so as to be flush with the reference surface 31b of the projection tube positioning jig 31. This can be realized by placing the projection tube positioning jig 31 and the projection tube 1 on a perfect flat plate and fixing the projection tube positioning jig 31 and the projection tube 1 with the projection tube fixing screw 32. Next, as in the structure shown in FIG.
A sealing material 17 for fixing the projection tube 1 and the bracket 2 in a liquid-tight manner is placed on b, and the projection tube holding plate 18, elastic material 19,
The projection tube 1 and the bracket 2 are liquid-tightly fixed using the connecting rod 20, the connecting rod pressing washer 21, and the connecting rod pressing screw 22.

Next, as shown in FIG. 4, the entrance lens holding plate height positioning jig is attached to the projection tube positioning jig.

In FIG. 4, reference numeral 41 is an incident lens pressing plate height positioning jig, and 45 is a jig fixing screw for fixing the incident lens pressing plate height positioning jig 41 to the projection tube positioning jig 31. .. Further, FIG. 5 shows an enlarged view of a portion A which is a main portion of the incident lens pressing plate height positioning jig 41. In FIG. 5, 42 is a sliding lower limit stopper fixed to the incident lens pressing plate height positioning jig 41, 43 is a sliding upper limit stopper fixed to the incident lens pressing plate height positioning jig 41, and 44 is a sliding lower limit stopper. 42a is a sliding plate that slides in a portion surrounded by the sliding upper limit stopper 43.
Is a reference surface for positioning the incident lens pressing plate 8 on the surface of the sliding plate 44. The sliding lower limit stopper 42, the sliding upper limit stopper 43, and the sliding plate 44 are not provided on the entire circumference, but are individually provided corresponding to the position of the incident lens pressing screw.

Since the sliding plate 44 can slide on the portion surrounded by the sliding lower limit stopper 42 and the sliding upper limit stopper 43, the height of the reference surface 44a can be changed. Further, the sliding plate 44 can be placed at an arbitrary position by a screw (not shown).
It has a structure that can fix.

Further, the sliding lower limit stopper 42, the sliding upper limit stopper 43, and the sliding plate 44 are fixed by screws (not shown) so that the sliding lower limit stopper 42 and the sliding upper limit stopper 43 are a set of three parts. ..

The entrance lens pressing plate height positioning jig 41 thus configured is fixed to the projection tube positioning jig 31 with the jig fixing screw 45, and further, the groove 2b of the bracket 2 is fixed.
FIG. 4 shows a state in which the sealing material 7 for fixing the bracket 2 and the incident lens 5a in a liquid-tight manner is inserted into the above, and the incident lens 5a is arranged thereon. Here, the hollow portion 2 of the sealing material 7
No fluid is contained in 5. The center of the entrance lens 5a is made to coincide with the center of the projection tube surface by the above-mentioned marking.

In FIG. 5, the sliding plate 44 is fixed while being raised until it hits the sliding upper limit stopper 43. Then, the incident lens pressing plate 8 is placed on the reference surface 44a of the sliding plate 44, and is fixed using the incident lens pressing washer 9 and the incident lens pressing screw 10. At this time, almost no tightening force needs to be applied to the incident lens pressing screw 10. Further, when the tightening force is applied, the incident lens pressing plate 8 is deformed, which is not desirable.
As a result, the final height position of the incident lens pressing plate 8 is determined. The positional relationship among the incident lens 5a, the incident lens pressing plate 8 and the incident lens pressing screw 10 in this state is as shown in FIG.

Thereafter, the sliding plate 44 is loosened and the sliding plate 44 is lowered. Then, the sliding lower limit stopper 42, the sliding upper limit stopper 43, and the sliding plate 44 are collectively removed from the incident lens pressing plate height positioning jig 41 by loosening a screw (not shown). This allows the sliding lower limit stopper 42, the sliding upper limit stopper 43, and the sliding plate 44 to be slid sideways together.

Then, the fluid is sealed in the hollow portion 25 of the sealing material 7. The state in which the fluid is enclosed is shown in FIG. The sealing fluid 7 becomes thicker due to the enclosed fluid and pushes up the incident lens 5a and the incident lens pressing plate 8, and finally the incident lens pressing plate 8 and the incident lens pressing washer 9 become immobile due to the incident lens pressing screw 10. .. The fluid moves to a place where it can move until it stops moving all around. Therefore, the thickness of the sealing material 7 is large at a position where the groove 2b of the bracket is large or the edge thickness of the incident lens is small,
On the contrary, the groove 2b of the bracket is small or the incidence lens 5
At a position where the edge thickness of a is thick, the thickness of the sealing material 7 becomes thin. The incident lens pressing plate 8 is fixed at a position determined by using the incident lens pressing plate height positioning jig 41. The edge surface of the entrance lens 5a on the exit surface side is pressed against the entrance lens holding plate 8. The incident lens pressing plate 8 has a flat surface with high accuracy. Therefore, the edge surface on the exit surface side of the entrance lens 5a was attached without inclination to the projection tube surface. As a result, the exit surface on the same side was also attached without tilting to the projection tube surface.

The mounting force of the incident lens 5a is determined by the sealing material 7
Since it is the pressure of the fluid enclosed in the hollow portion 25, it is the same for the entire circumference. Therefore, no deformation that deteriorates the axial symmetry of the surface shape occurs.

Silicone was used as the enclosed fluid, a curing agent was added, and the mixture was injected in a state of low viscosity. After that, the effect of the hardening material increased the viscosity, and the outflow from the sealing material 7 was prevented. The effect time can be shortened by the heat generated from the projection tube.

Then, the lenses 5b, 5c, 5d are assembled into the inner lens barrel 3 by using the lens holders 15 and 16, and the inner lens barrel 3 is externally attached by using the inner lens barrel holding washer 13 and the inner lens barrel holding screw 14. The outer lens barrel 4 is assembled into the lens barrel 4, and the outer lens barrel 4 is attached to the bracket 2 using the outer lens barrel holding washer 13 and the outer lens barrel holding screw 14.

The projection optical apparatus constructed and attached as described above projects an image on the screen of the projection tube 1, magnifies the image with the lenses 5a, 5b, 5c and 5d, and displays it on the screen (not shown). It displays a large screen image. The heat generated from the projection tube that has a high output for improving the brightness is transmitted to the cooling liquid sealed in the air gap, and is further radiated to the surroundings by the heat radiation fins provided on the bracket 2. As a result, the projection tube 1 is cooled and the destruction due to heat does not occur. Further, the change in volume with the temperature of the cooling liquid corresponds to the change in shape of the bellows 6.

As described above, the incident lens is not deformed,
A highly accurate projection optical device with little performance deterioration is provided because the exit surface with high accuracy required for the incident lens can be mounted so as to prevent the projection tube surface from tilting with respect to the projection tube surface and to prevent eccentricity between the projection tube surface and the lens. I was able to do it.

The sealing material 7 must be a substance that is not attacked by the cooling liquid that cools the projection tube. Also,
It is necessary that the material properties of the material do not change significantly due to the heat generated from the projection tube.

The projection lens used in the present invention may be a plastic lens, a glass lens, or a hybrid lens in which a plastic film is provided on the surface of the glass lens, and the number of constituent lenses is not limited.

The material and manufacturing method of the bracket are not limited, and there is no problem even if it is a plastic bracket, for example.

In order to seal the fluid inside the sealing material, it is necessary to seal the outer skin of the inlet of the sealing material after sealing the fluid. As a material of the sealing material and a sealing method, a thermoplastic elastomer may be heat-sealed, rubber may be adhesively sealed, or the like, which has flexibility and enables sealing.

Further, the fluid to be enclosed may be another substance. Also, the viscosity of the fluid does not necessarily have to change after encapsulation.

Further, the markings on the projection tube and the incident lens are not limited to the center, but the positional relationship between the two is clear. For that reason, there is no problem in marking other parts such as the bracket.

The marking does not necessarily have to be decolorizable. Further, since the optical performance can be improved only by preventing the deformation, the positioning by the marking does not always have to be performed.

[0063]

As described above, according to the present invention, the edge thickness of the incident lens and the flat surface of the groove of the bracket are filled by enclosing the fluid in the sealing material that fixes the incident lens and the bracket in a liquid-tight manner. The thickness of the sealing material is changed according to the degree, the pressure of the fluid is used as the mounting force of the incident lens, and markings that do not affect the optical performance are applied to the incident lens and the projection tube. Even if the flatness of the groove was poor, it was possible to attach the incident lens and the projection tube surface with high accuracy without deforming the incident lens.

As a result, the projection optical apparatus of the present invention can display a high-performance image.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a projection optical apparatus according to the present invention.

FIG. 2 is a sectional view of a main part of the projection optical apparatus according to the embodiment shown in FIG.

FIG. 3 is a cross-sectional view showing a mounted state of a main part in an embodiment of the method of assembling the projection optical device according to the present invention.

FIG. 4 is a cross-sectional view showing a mounting state of a main part in an embodiment of an assembling method of a projection optical device according to the present invention.

FIG. 5 is a cross-sectional view showing a mounted state of a main part in an embodiment of the method of assembling the projection optical device according to the present invention.

FIG. 6 is a cross-sectional view showing a mounted state of a main part in an embodiment of the method of assembling the projection optical device according to the present invention.

FIG. 7 is a cross-sectional view showing a mounted state of a main part in an embodiment of the method of assembling the projection optical device according to the present invention.

FIG. 8 is a cross-sectional view showing a mounted state of a main part in an embodiment of a conventional projection optical device assembling method.

FIG. 9 is a cross-sectional view showing an embodiment of a plastic lens injection molding die.

FIG. 10 is a cross-sectional view showing an example of a main part of a conventional projection optical device.

FIG. 11 is a cross-sectional view showing an example of the shape of a plastic lens obtained by molding with the injection molding die of FIG.

FIG. 12 is a cross-sectional view showing a state of the injection mold of FIG. 6 during a molding process.

FIG. 13 is a cross-sectional view showing a mounted state of main parts in an embodiment of a conventional projection optical apparatus assembling method.

FIG. 14 is a cross-sectional view showing a mounted state of main parts in an embodiment of a conventional projection optical device assembling method.

[Explanation of symbols]

1 ... Projection tube, 2 ... Bracket, 3 ... Outer lens barrel, 4 ... Inner lens barrel, 5 ... Lens, 5a ... Incident lens, 7 ... Sealing material, 8
... incident lens pressing plate, 9 ... incident lens pressing washer,
10 ... Screw for pressing incident lens, 25 ... Hollow part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Hirata, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Ltd.

Claims (10)

[Claims] 1. A cooling liquid is sealed in a space surrounded by a projection tube, a lens arranged closest to the projection tube, and a bracket for fixing the projection tube and the lens so as to face each other. In a projection optical device for cooling the projection tube, a sealing material provided between the lens and the bracket to make the lens and the bracket liquid-tight is hollow, and a fluid is sealed in the hollow portion. And a projection optical device. 2. The fixing force between the lens and the bracket,
The projection optical apparatus according to claim 1, wherein the pressure of the fluid enclosed in the hollow portion of the sealing material is used. 3. The projection optical apparatus according to claim 1, wherein the fluid enclosed in the hollow portion of the sealing material has a high viscosity after being enclosed. 4. A cooling liquid is sealed in a space surrounded by a projection tube, a lens arranged closest to the projection tube, and a bracket for fixing the projection tube and the lens so as to face each other. In a projection optical device for cooling the projection tube, a thickness of a sealing material provided between the lens and the bracket is variable depending on a position in order to make the lens and the bracket liquid-tight. Optical device. 5. A cooling liquid is enclosed in a space surrounded by a projection tube, a lens arranged closest to the projection tube, and a bracket for fixing the projection tube and the lens so as to face each other. In a method of assembling a projection optical device for cooling the projection tube, a sealing material provided between the lens and the bracket to make the lens and the bracket liquid-tight is hollow, and a fluid is sealed in the hollow portion. A method for assembling a projection optical device, characterized in that the projection optical device is assembled. 6. The fixing force between the lens and the bracket,
6. The projection optical apparatus assembling method according to claim 5, wherein the assembly is performed by using the pressure of the fluid enclosed in the hollow portion of the sealing material. 7. A fixing force between the lens and the bracket,
7. The method of assembling a projection optical device according to claim 5, wherein the projection optical device is assembled by acting from the projection tube side toward the lens side. 8. A cooling liquid is sealed in a space surrounded by a projection tube, a lens arranged closest to the projection tube, and a bracket for fixing the projection tube and the lens so as to face each other. In a method of assembling a projection optical device for cooling the projection tube, a sealing material provided between the lens and the bracket to make the lens and the bracket liquid-tight is assembled by changing a thickness depending on a position. A method for assembling a characteristic projection optical device. 9. The projection optical apparatus according to claim 8, wherein the tube surface of the projection tube and the surface of the lens surface of the lens that is not the projection tube side are aligned with each other. Assembly method. 10. The method of assembling a projection optical apparatus according to claim 9, wherein the projection tube and the lens are assembled by marking with red, blue or green.