JPH085883A - Projection device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive and reliable projection device capable of coping with the change of a screen size and a projection angle by using projection units having the same constitution as a projector magnified-projecting a picture on a screen by using a projection lens. CONSTITUTION:The projection tube 21 of the projection unit constituted by filling a gap between the projection tube 21 and the projection lens 28 with coolant 32 is attached to a spacer block 22 in a watertight state with a projection tube packing 29, and is provided with an adjusting packing 47 sealing a gap between the inner wall surface of the spacer block 22 and the outer peripheral surface 28s of the lens barrel 28a of the projection lens 28 disposed at a specified distance therefrom in the watertight state is installed to movably connect the spacer block 22 and the projection lens 28 to each other. Three same projection units constituted in such a way are used to allow attitudes of the projection tube 21 and the projection lens 28 to correspond to respective red, green and blue units.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device in which a cooling liquid is filled between a projection tube and a projection lens in a projector for enlarging and projecting an image.

[0002]

2. Description of the Related Art FIG. 15 is a sectional view of a projection device of a conventional projector disclosed in, for example, Japanese Utility Model Publication No. 2-41979, and FIG. 16 is an exploded perspective view thereof. In the figure,
Reference numeral 21 is a projection tube such as a cathode ray tube, and 22 is a spacer block made of a material having good heat conductivity such as aluminum die casting. Further, on the side of the spacer block 22 to which the projection tube 21 is attached, a boss portion 22 having a screw hole 22d is formed.
c is provided. Reference numeral 23 denotes a holding plate having contact holes 23a that come into contact with the funnel portion 21b of the projection tube 21, and mounting holes 23b are provided at four corners. In order to press the pressing plate 23 evenly, one end of the pressing plate 23 comes into contact with the boss portion 22c of the spacer block through the mounting hole 23b, and the stepped screw 27 having the spring 25 inserted on the outer periphery is attached to the screw hole 22d of the boss portion 22c. Tighten to. At this time, one end of the spring 25 comes into contact with the pressing plate 23 and the other end comes into contact with the washer 26 attached to the neck portion of the screw 27, so that the projection tube 21 is pressed against the spacer block by the pressing force of the spring 25. Attach to 22. Reference numeral 36 is a deflection yoke attached to the projection tube, 37 is a focus magnet, and 38 is a CRT substrate.

On the other hand, a lens barrel 28a of the projection lens 28 is provided with a screw 2 on the side opposite to the projection tube side of the spacer block 22.
It is attached at 7. At this time, between the face surface 21f of the projection tube 21 and the projection tube installation surface 22f of the spacer block 22, and between the final lens 28b of the projection lens 28 and the lens installation surface 22g of the spacer block 22. Is provided with a projection tube packing 29 and a lens packing 30, respectively.
The space 31 surrounded by 8 and the spacer block 22 is kept watertight.

A cooling liquid 32 such as ethylene glycol filled in the space 31 prevents the light emitted from the projection tube 21 from returning to the fluorescent screen to prevent the deterioration of the contrast of the projected image and the operation of the projector. Sometimes the projection tube 21
The heat generated on the face surface 21f of the
2 is transmitted to the spacer block 22 via 2 and is radiated to the outside. Reference numeral 33 is a tank that stores an expanded component when the cooling liquid 32 thermally expands.

Another conventional example is Japanese Patent Laid-Open No. 4-352.
FIG. 18 is a cross-sectional view showing another example of the conventional projection device shown in Japanese Patent Publication No. 141, and FIG. 18 is a cross-sectional view of the main part of the seal portion thereof. In the figure, the projection tube 21 is attached in a watertight state via a first O-ring 52 mounted in an annular groove 51a provided on the periphery of the projection tube frame 51 on the projection tube side opening. On the other hand, the second O-ring 54 mounted in the annular groove 53a provided in the peripheral edge of the lens frame 53 on the lens side.
The projection lens 28 is mounted in a watertight state via the.

Reference numeral 55 denotes a bellows as a coupler, which is a cylindrical bellows formed of an iron-based metal material such as stainless steel having an urging force in the axial direction, and is installed between the projection tube frame 51 and the lens frame 53. ing. The installation method is as follows. That is, the both ends of the bellows 55 are welded with an annular body A56 and an annular body B57 as mounting flanges having a plurality of mounting holes 56a and 57a arranged at intervals in the circumferential direction. Then, the attachment hole 56a of the annular body A56 is tightened with the screw 60 via the third O-ring 58 mounted in the annular groove 51b provided on the lens-side opening peripheral edge of the projection tube frame 51 to make it watertight. Similarly, the lens frame 5
The mounting hole 57a of the annular body B57 is tightened with the screw 60 through the base O-ring 59 mounted in the annular groove 53b provided on the opening edge of the projection tube 3 on the projection tube side so as to be watertight.

Reference numeral 61 denotes a projection tube block 81 in which the projection tube 21 is attached to the projection tube frame 51 via a first O ring 52, and a projection lens 28 is attached to a lens frame 53 via a second O ring 54. Lens block 82
An adjusting mechanism 98 that can change the relative angle and distance between the two is a holding unit that connects the and.

Next, the operation will be described. A projector is a device that creates a large screen by enlarging and projecting the image of the projection tube with a projection lens.
The heat of the face surface 21f of No. 1 is radiated through the cooling liquid 32 from the spacer block 22 made of aluminum having good heat conduction. For this reason, it is important to prevent the cooling liquid 32 from leaking. With the projection tube packing 29 and the lens packing 30 installed at predetermined positions, the projection tube 21 and the projection lens 28 are used to mount the spacer block 22 on the mounting surface. An important point is the seal structure that must reliably press against 22f and 22g.

In an ordinary projector, as shown in FIG. 19, a projection unit 83 including a projection tube 21, a projection lens 28 and a spacer block 22 is provided in red, green and blue to increase the brightness of the projection device. The one used as a unit is widely known. In such a projector, the projection axes of the projection units 83x, 83y, 83z are inclined with respect to each other so that the images formed by the projection tubes 21x, 21y, 21z coincide with each other at a certain point on the screen 99. Furthermore, the projection units 83 on both sides
In x and 83z, the relative angle and distance between the projection tube and the projection lens are changed in order to adjust the focus on the periphery.

By the way, in this type of projector, the concentration angle θ1 and the launch angle (not shown) change with the change of the projection system such as the screen size, the projection distance or the projection angle. , 21y, 2
It is necessary to adjust the focus in the center and the periphery of the screen by changing the horizontal centralized correction angle θ2 and the vertical correction angle (not shown) of 1z.

[0011]

In the projection device of the conventional projector, one projection device is composed of three projection units, three types of spacer blocks are required, and the projection distance and the screen size are different. When manufacturing different models, there is a problem that it is necessary to remake a new spacer block, which requires a lot of design time and manufacturing cost of the die casting mold.

Further, the mounting attitude of the projection tube with respect to the projection lens is determined by the processing accuracy of the spacer block, and there is a problem that there is no means for correcting even if an assembly error occurs.

Further, in Japanese Laid-Open Patent Application No. 4-104 shown in FIGS.
Even if the projection tube and the projection lens can be changed in posture as described in Japanese Patent No. 352141, four sealing members are required because there are four cooling liquid sealing portions, and there are four dangerous places for liquid leakage. Therefore, it was disadvantageous in terms of cost and reliability.

Further, when fixing the bellows with a screw, either the projection tube frame or the lens frame interferes with the workability.

Further, since the bellows is made of metal, there is a problem that it lacks flexibility and that the internal volume cannot be changed even if the cooling refrigerant liquid expands due to heat generation of the projection tube.

Furthermore, a long distance between the projection tube frame and the lens frame is required for mounting the bellows.

The present invention has been made to solve the above-mentioned problems. One type of spacer block is used for red,
In addition to being compatible with three projection units for green and blue, it is also possible to support models with different projection distances and screen sizes.
Another object of the present invention is to obtain a projection device having a structure that is low in cost, highly reliable, and has good workability.

[0018]

According to a first aspect of the present invention, there is provided a projection device comprising: an inner wall surface of a hole provided in a spacer block for holding a projection tube in a watertight state; and an outer surface of a lens barrel of a projection lens. By arranging a packing between and, the spacer block is movably assembled to the projection lens while maintaining the watertight state of both.

In the projection apparatus according to the second aspect of the present invention, an inclined surface or a curved surface is provided on the inner wall surface of the hole portion of the spacer block which holds the projection tube in a watertight state, and the inclined surface or curved surface is inserted at a predetermined distance from this surface. By arranging packing between the projection lens and the outer corner surface of the lens barrel of the projection lens, the spacer block is movably assembled to the projection lens while maintaining the watertight state of both.

According to a third aspect of the present invention, in the projection device, the outer surface of the lens barrel of the projection lens is inserted at a predetermined distance from the inner wall surface of the hole of the spacer block that holds the projection tube in a watertight state. By providing a step portion on either one or both of these and installing a packing on this step portion, the spacer block is movably assembled to the projection lens while maintaining the watertight state of both.

Further, according to a fourth aspect of the present invention, in the projection device, the outer surface of the lens barrel of the projection lens is inserted at a predetermined interval from the inner wall surface of the hole of the spacer block that holds the projection tube in a watertight state. On the packing that is placed between
In addition to the seal portion for maintaining the watertight state of both, a spacer block or a mounting portion for fixing or adhering to the projection lens is provided, and the spacer block is movably assembled to the projection lens.

[0022]

In the projection device according to claim 1 of the present invention,
Since the packing is installed in the circumferential direction between the inner wall surface of the spacer block that holds the projection tube in a watertight state and the outer peripheral surface of the lens barrel of the projection lens, they are connected in a watertight state, so both can move. The amount of change in the gap in the circumferential direction at this time is minute, and the postures such as the angle and distance between the projection tube and the projection lens can be changed in the state of being filled with the cooling liquid while being filled with the cooling liquid.

In the projection device according to the second aspect of the present invention, the inclined surface formed in the corner portion of the hole through which the image light of the spacer block holding the projection tube in a watertight state passes,
Or, since packing is placed between the curved surface and the corner surface of the lens barrel facing the corner portion and connected in a watertight state, the amount of change in the circumferential gap when the two are movable is small. With the cooling liquid filled, the angles and distances between the projection tube and the projection lens can be changed with the cooling liquid filled, the projection lens can be easily inserted into the spacer block, and the dimension of the sealing surface can be varied. Can handle.

In the projection device according to the third aspect of the present invention, the projection tube is formed on the inner wall surface of the spacer block holding the projection tube in a watertight state or on the outer peripheral surface of the lens barrel facing the inner wall surface. Since the packing is attached to the stepped part and connected in a watertight state, the amount of change in the circumferential direction when both are moved is minute, and the angle, distance, etc. between the projection tube and projection lens when the cooling liquid is filled. The posture can be changed with the coolant filled, and even if the spacer block is moved, the position of the packing does not move and the sealing point is defined.

In the projection apparatus according to the fourth aspect of the present invention, the projection tube is mounted on the inner wall surface of the spacer block holding the projection tube in a watertight state or on the outer peripheral surface of the lens barrel facing the inner wall surface. Since the mounting part that can be temporarily fixed to the packing is provided, the amount of change in the circumferential direction when both are moved is small, and the postures such as the angle and distance between the projection tube and the projection lens when the cooling liquid is filled are small. It can be changed while the coolant is being filled, and even if the spacer block is moved, the position of the packing does not move and the sealing point is defined. further,
The packing does not move or come off when inserting the projection lens into the spacer block.

[0026]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a projection apparatus according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a cross-sectional view of essential parts showing a state where three projection units are installed in a device. In the figure, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The spacer block 22 is formed with a hole 22v that allows projection light to pass therethrough. A projection tube packing 29 is attached to an annular groove 22m provided in the peripheral edge of the opening of the hole 22v on the projection tube side. There is. The projection tube 21 is installed in contact with the projection tube packing 29, and the projection tube 21 and the spacer block 22 are attached in a watertight state by pressing the pressing plate 23 with the force of the spring 25 as in the conventional example.

The projection lens 28 is composed of a plurality of lens groups held by a lens barrel 28a, and is the most projection tube 2
The final lens 28b closest to 1 is attached to the lens barrel 28a in a watertight state by adhesion or the like. Then, the inner wall surface of the spacer block 22 is inserted into the outer peripheral surface 28s of the lens barrel 28a with a predetermined space L, and an annular adjustment packing 47 as a seal member is provided between the lens barrel 28a and the spacer block 22. To keep them watertight. In this way, the space 31 surrounded by the projection tube 21, the projection lens 28, and the spacer block 22
Then, the cooling liquid 32 is filled through the injection port 22w provided in the spacer block 22. An inlet screw 74 is screwed through the inlet packing 75, and serves as a lid for preventing the cooling liquid 32 from flowing out.

As the cooling liquid 32, for example, ethylene glycol, silicon oil, or the like is used, and in addition to the role of transmitting the heat generated from the face surface 21f of the projection tube 21 to the spacer block 22 during operation, the projection tube is also radiated to the outside. 21
Since the refractive index is the same as that of glass, which is the material of the projection lens 28 and the projection lens 28, the projection lens 28 does not refract light from the projection tube.
Light to prevent the light from returning to the fluorescent surface and prevent deterioration of contrast.

Reference numeral 71 denotes a diaphragm fixed by a cover 72. The expansion / contraction of the diaphragm 71 absorbs the volume change caused by the expansion and contraction of the cooling liquid 32 during operation and non-operation so that the pressure in the space 31 is kept constant. It has become. This diaphragm 71 is also kept watertight by the convex portions 71a provided around it. 73 is the projection lens 28
Is a base fixed with screws 27. Further, 36 is a deflection yoke, 37 is a focus magnet, and 39 is a CRT.
The substrate.

In order to maintain a predetermined posture between the projection lens 28 and the spacer block 22, the spacing member 48 is sandwiched between the projection lens 28 and the spacer block 22, and the projection lens 28 and the spacer block 22 are fixed by tightening the screws 27. Therefore, the angle of the projection tube 21 with respect to the projection lens 28 can be arbitrarily set by changing the thickness of the spacing member 48 on the left and right sides or the up and down sides. Moreover, since it is configured without increasing the number of sealing points, the risk of liquid leakage does not increase, and the number of parts does not increase, which is advantageous in terms of cost. Further, since the lens barrel is made of a material such as aluminum or plastic, it is easy to process and the surface accuracy is easy to obtain, so that the lens barrel has excellent sealing property.

Next, the operation will be described. The projector is an apparatus for enlarging and projecting the image of the projection tube 21 by the projection lens 28 to create a large screen, and the heat of the face surface 21f of the projection tube 21 which becomes extremely high in heat conduction through the cooling liquid 32 is good. Spacer block 22 made of aluminum
The heat is radiated from. Therefore, it is important to have a watertight structure that prevents the cooling liquid 32 filled between the projection tube 21 and the projection lens 28 from leaking.

An ordinary projector, as shown in FIG.
In order to increase the brightness, the projection unit 83 including the projection tube 21, the projection lens 28, and the spacer block 22 is set in red,
The ones used as three units of green and blue are widely known. In such a projector, an image formed by each projection tube 21x, 21y, 21z is displayed on the screen 9
9 so that the projection units 83x,
The projection axes Px and Pz of 83y and 83z are set to the projection unit 8
It is tilted by a concentration angle θ1 with respect to the projection axis Py of 3y. Further, in the projection units 83x and 83z on both sides, the projection axes Px and Px are provided in order to focus the periphery.
The tube axes Kx and Kz of the projection tube 21 with respect to z
It is configured to be inclined by 2. Further, 95 is a unit base to which the projection unit 83 is attached with screws 27, and 97 is an exterior of the device.

By the way, in this type of projector, when the screen size, the projection distance, or the installation posture changes, the concentration angle θ1 and the concentration correction angle θ2 explained above.
Then, it is necessary to adjust the focus at the center and the periphery of the screen by changing the launch angle and the launch correction angle (both not shown) that are the upper and lower projection angles. The following method is used to change the relative angle between the projection lens 28 and the projection tube 21. That is, when the screw 27 that fixes the projection lens 28 and the spacer block 22 is loosened, the spacer block 22 becomes free to move.
It is possible to freely change the posture of the projection tube 21, which is fixed to the holding plate 23 and the spring 25 at the position 2. At this time, since the adjusting packing 47 is mounted between the inner wall surface 22s of the spacer block 22 and the outer peripheral surface 28s of the projection lens 28, the watertight state is maintained even if the postures of both are changed. Further, the projection tube 21 is set at a predetermined angle with respect to the projection lens 28 by changing the thickness of the spacing member 48 in the vertical and horizontal directions to a predetermined thickness.
Moreover, since the lens barrel 28a of the projection lens 28 and the spacer block 22 are kept watertight even if they are moved by the adjusting packing 47, the cooling liquid 32 does not leak.

FIG. 4 is a sectional view showing a modification of the projection apparatus in the first embodiment. In the figure, the lens barrel 28a is divided into an X section 28x that holds the final lens 28b and a Y section 28y that holds the other lens group, and the X section 28x is separated.
Even if the adjusting packing 47 is provided between the spacer block 22 and the spacer block 22, the same effect can be obtained.

Example 2. FIG. 5 is a sectional view showing a projection device according to the second embodiment of the present invention. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Also,
The structure of the spacer block 22 and that the projection tube 21 is attached in a watertight state via the projection tube packing 29 are the same as in the first embodiment, and therefore the description thereof is omitted.

The projection lens 28 is constituted by holding a plurality of lens groups by a lens barrel 28a, and is the most projection tube 2
The final lens 28b close to 1 is attached to the lens barrel 28a in a watertight state by adhesion or the like. An inclined surface 28k is provided on the outer peripheral surface 28s of the lens barrel 28a. In addition, the inner wall surface 22 of the spacer block 22
s is provided with an inclined surface 22k with a predetermined distance L from the inclined surface 28k of the lens barrel 28a. Both the lens barrel 28a and the inclined surface 28 of the spacer block 22.
The annular packing 4 as a seal member between k and 22k.
7 is provided to keep both of them watertight. In this way, the projection tube 21, the projection lens 28, and the spacer block 22
The space 31 surrounded by is filled with the cooling liquid 32 through the injection port 22w provided in the spacer block 22. An inlet screw 74 is screwed through the inlet packing 75, and serves as a lid for preventing the cooling liquid 32 from flowing out.

As the cooling liquid 32, for example, ethylene glycol, silicon oil, or the like is used. In addition to the role of transmitting the heat generated from the face surface 21f of the projection tube 21 to the spacer block 22 during operation, the projection tube is also radiated. 21
Since the refractive index is the same as that of glass, which is the material of the projection lens 28 and the projection lens 28, the projection lens 28 does not refract light from the projection tube.
Light to prevent the light from returning to the fluorescent surface and prevent deterioration of contrast.

Reference numeral 71 denotes a diaphragm fixed by a cover 72, so that the expansion and contraction of the diaphragm 71 absorbs the volume change due to the expansion and contraction of the cooling liquid 32 during operation and non-operation so that the pressure in the space 31 is kept constant. It has become. 73 is a base to which the projection lens 28 is fixed. Further, the structure for holding the projection lens 28 and the spacer block 22 in a predetermined posture is the same as that of the first embodiment, and the description thereof will be omitted.

Next, the operation will be described. The projector is an apparatus for enlarging and projecting the image of the projection tube 21 by the projection lens 28 to create a large screen, and the heat of the face surface 21f of the projection tube 21 which becomes extremely high in heat conduction through the cooling liquid 32 is good. Spacer block 22 made of aluminum
The heat is radiated from. Therefore, a watertight structure that prevents the cooling liquid 32 from leaking is important, and a normal projector is composed of three projection units 83, and the projection units on both sides of the projection unit are tilted by the concentration angle θ1. The projection axis P and the tube axis K are arranged in a concentrated correction angle θ2.
It is similar to the conventional one that it is configured to be inclined only.
Also, if the screen size or installation posture changes, the concentration angle θ
1. It is also necessary to change the centralized correction angle θ2 and the like. Therefore, the structure in which the projection lens 28 and the spacer block 22 are movable in a watertight state is the same as that of the first embodiment, and therefore the description thereof is omitted.

FIG. 6 is a cross-sectional view of an essential part showing a modified example of the projection apparatus in the second embodiment. As shown in the figure, the inner wall of the spacer block 22 is formed with a curved surface 22r, and the curved surface 22r faces the curved surface. The curvature surface 28r is provided on the lens barrel 28a, and the adjustment packing 47 is provided between the curvature surfaces 22r and 28r.
The same effect can be obtained by disposing.

Example 3. FIG. 7 is a sectional view showing a projection device according to the third embodiment of the present invention. In the figure, Example 1
The same parts as those in FIG. Further, since the structure of the spacer block 22 and the projection tube 21 being attached in a watertight state via the projection tube packing 29 are the same as those in the first embodiment, the description thereof will be omitted.

The projection lens 28 is composed of a plurality of lens groups held by a lens barrel 28a, and is the most projection tube 2
The final lens 28b close to 1 is attached to the lens barrel 28a in a watertight state by adhesion or the like. The outer peripheral surface 28s of the lens barrel 28a is the spacer block 22.
The inner wall surface 22s is arranged with a predetermined distance L. An annular adjusting packing 47 is provided as a seal member between the outer peripheral surface 28s of the lens barrel 28a and the inner wall surface 22s of the spacer block 22 to keep them both watertight. At this time, an arcuate step portion 28d is formed on the outer peripheral surface 28s of the lens barrel 28a, and the adjustment packing 47 is attached to the step portion 28d. In this way, the projection tube 21
The space 31 surrounded by the projection lens 28 and the spacer block 22 is filled with the cooling liquid 32 from the injection port 22w provided in the spacer block 22. An inlet screw 74 is screwed through the inlet packing 75, and serves as a lid for preventing the cooling liquid 32 from flowing out.

As the cooling liquid 32, for example, ethylene glycol, silicon oil, or the like is used. In addition to the role of transmitting the heat generated from the face surface 21f of the projection tube 21 to the spacer block 22 during operation, the projection tube is also radiated to the outside. 21
Since the refractive index is the same as that of glass, which is the material of the projection lens 28 and the projection lens 28, the projection lens 28 does not refract light from the projection tube.
Light to prevent the light from returning to the fluorescent surface and prevent deterioration of contrast.

Reference numeral 71 is a diaphragm fixed by a cover 72, and the volume change due to expansion and contraction of the cooling liquid 32 during operation and non-operation is absorbed by expansion and contraction of the diaphragm 71 to keep the pressure in the space 31 constant. It has become. 73 is a base to which the projection lens 28 is fixed. Further, the structure for holding the projection lens 28 and the spacer block 22 in a predetermined posture is also the same as that of the first embodiment, and the description thereof will be omitted.

Next, the operation will be described. The projector is an apparatus for enlarging and projecting the image of the projection tube 21 by the projection lens 28 to create a large screen, and the heat of the face surface 21f of the projection tube 21 which becomes extremely high in heat conduction through the cooling liquid 32 is good. Spacer block 22 made of aluminum
The heat is radiated from. Therefore, a watertight structure that prevents the cooling liquid 32 from leaking is important, and a normal projector is composed of three projection units 83, and the projection units on both sides of the projection unit are tilted by the concentration angle θ1. The projection axis P and the tube axis K are arranged in a concentrated correction angle θ2.
It is similar to the conventional example that it is configured to be inclined only. Further, when the screen size or the installation posture changes, the concentration angle θ1, the concentration correction angle θ2, etc. need to be changed. Therefore, the structure in which the projection lens 28 and the spacer block 22 are movable in a watertight state as in the first embodiment. The description is omitted because it is similar.

Although not shown, the step portion 28d of the lens barrel 28a need not have an arc shape.

FIG. 8 is a sectional view of the essential parts showing a modification of the third embodiment. In the figure, the inner wall surface 2 of the spacer block 22
The step portion 22z is integrally formed at a predetermined position of 2s, and the same effect can be obtained with the structure in which the adjustment packing 47 is attached to the step portion 22z.

Further, FIG. 9 is a sectional view showing a structural example in which the second embodiment and the third embodiment are combined. In the figure, an inclined surface 28k provided on the outer peripheral surface 28s of the lens barrel 28a
And a spacer block 22 arranged at a predetermined distance L
A V-shaped step portion 22z is formed on the inclined surface 22k. The same effect can be obtained with a structure in which the adjustment packing 47 is attached to the step portion 22z so that the spacer block 22 and the projection lens 28 are in a watertight state.

Although not shown, a V-shaped cut portion may be formed on the final lens 28b side, or FIG.
As shown by, the spacer block 22 and the lens barrel 28a
You may form a V-shaped disconnection in both of these. With such a configuration, when the spacer block 22 is processed, an undercut does not occur, so that there is an additional advantage that the moldability is improved.

Embodiment 4 FIG. FIG. 11 is a cross-sectional view of essential parts showing a projection device according to the fourth embodiment of the present invention. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Further, the structure of the spacer block 22 and the projection tube 21 attached in a watertight state via the projection tube packing 29 are the same as those in the first embodiment, and therefore the description thereof will be omitted.

The projection lens 28 is constituted by holding a plurality of lens groups by a lens barrel 28a, and the projection tube 2
The final lens 28b close to 1 is attached to the lens barrel 28a in a watertight state d by adhesion or the like. The outer peripheral surface 28s of the lens barrel 28a is the spacer block 22.
The inner wall surface 22s is arranged with a predetermined distance L. An annular adjustment packing 47 is provided as a seal member between the outer peripheral surface 28s of the lens barrel 28a and the inner wall surface 22s of the spacer block 22 to keep them both watertight. At this time, a mounting portion 47b is integrally formed on the adjustment packing 47 in addition to the seal portion 47a, and the mounting portion 47b is formed in the mounting groove 22t formed at a predetermined position of the inner wall surface 22s of the spacer block 22. The adjustment packing 47 is arranged at a predetermined position by mounting and fixing. In this way, the projection tube 21, the projection lens 28, and the spacer block 22
The space 31 surrounded by is filled with the cooling liquid 32 through the injection port 22w provided in the spacer block 22. An inlet screw 74 is screwed through the inlet packing 75, and serves as a lid for preventing the cooling liquid 32 from flowing out.

As the cooling liquid 32, for example, ethylene glycol, silicon oil, or the like is used. In addition to the role of transmitting the heat generated from the face surface 21f of the projection tube 21 to the spacer block 22 during operation, the projection tube is also radiated to the outside. 21
Since the refractive index is the same as that of glass, which is the material of the projection lens 28 and the projection lens 28, the projection lens 28 does not refract light from the projection tube.
Light to prevent the light from returning to the fluorescent surface and prevent deterioration of contrast.

Although not shown, the structure for adjusting the volume change of the cooling liquid 32 during the operation and the non-operation and the structure for holding the projection lens 28 and the spacer block 22 in a predetermined posture are the same as those in the first embodiment. Since it exists, the description is omitted.

Next, the operation will be described. The projector is an apparatus for enlarging and projecting the image of the projection tube 21 by the projection lens 28 to create a large screen, and the heat of the face surface 21f of the projection tube 21 which becomes extremely high in heat conduction through the cooling liquid 32 is good. Spacer block 2 made of aluminum
It radiates heat from 2. Therefore, a watertight structure that prevents the cooling liquid 32 from leaking is important.

A normal projector is composed of three projection units 83, and the projection units on both sides of the projection unit 83 are arranged so as to be inclined by the concentration angle θ1, and the projection axis P and the tube axis K are concentrated correction angles. It is the same as the conventional one in that it is inclined by θ2. Also, when the screen size and installation posture change, the concentration angle θ1 and the concentration correction angle θ2
Therefore, the structure for moving the projection lens 28 and the spacer block 22 in a watertight state is the same as that of the first embodiment, and therefore the description thereof is omitted.

FIG. 12 is a sectional view of the essential parts showing a modification of the fourth embodiment. In the figure, the adjustment packing 47 is attached to the step portion 22z provided at a predetermined position on the inner wall surface 22s of the spacer block 22, and the spacer block 22 is attached with an adhesive 49.
The same effect can be obtained even when fixed to.

Although not shown, even if the adjusting packing 47 is adhered to the lens barrel 28a side, the same effect can be obtained.

FIG. 13 is a sectional view showing another fastening means for the projection lens 28 and the spacer block 22 and another mounting means for the projection tube 21, and FIG. 14 is a perspective view thereof.
In the figure, the projection tube 21 is installed via a projection tube packing 29 mounted in the annular groove 22m of the spacer block 22, and is attached to the spacer block 22 in a watertight state by the projection tube band 76. That is, the annular portion 76a of the projection tube band comes into contact with the funnel portion 21b of the projection tube 21 via the rubber sheet 77 as a cushioning material, the screw 27 is passed through the leg portion 76b of the projection tube band 76, and the boss of the spacer block 22 is inserted. The projection tube 21 is fixed by being screwed into the portion 22c. On the other hand, the spacer block 22 and the lens barrel 28a of the projection lens are fastened together by a screw 27 via a spring 78, and the projection tube 21 and the projection lens 28 are made in an arbitrary posture by utilizing the repulsive force of the spring 78. connect.

Further, in each of the above embodiments, the lens barrel 28a and the adjustment packing 4 for the spacer block 22.
The surface with which 7 comes into contact may be coated with a metal oxide or the like to increase the flatness.

[0061]

As described above, according to the projection device of the first aspect of the present invention, the space between the inner wall surface of the spacer block and the outer circumferential surface of the projection lens lens barrel is sealed by the packing,
In addition, since it is movably connected, the relative position of the projection tube and the projection lens can be arbitrarily changed, so that the same projection unit can handle changes in screen size and projection angle. Therefore, it is not necessary to manufacture the spacer blocks of three types of red, green, and blue, or for each screen size and each projection angle, which can shorten the design time and the manufacturing cost.

Further, compared to the conventional product in which the projection tube and the projection lens can be moved, the number of sealing points for the cooling liquid is small, so there are few danger points for liquid leakage, and the packing compression change amount during movement is also small. It is a structure that does not easily leak liquid.

Further, since the relative angle between the projection tube and the projection lens and the distance can be easily changed in a state of being filled with the cooling liquid, the projection position and the screen size can be adjusted according to the user's request not only during production but also after commercialization. Can be changed easily.

Further, since the space between the inner wall surface of the spacer block and the outer peripheral surface of the lens barrel is movably sealed by the seal member, it can be constructed even if the distance between the projection tube and the projection lens is narrow, and the design margin is small. Will increase.

Further, since the lens barrel is made of a material such as aluminum or plastic, it is excellent in workability, and it is easy to obtain surface accuracy so that an arbitrary shape can be created, so that the sealing property is improved and the reliability is increased.

According to the projection device of the second aspect of the present invention, the inner wall surface of the spacer block and the outer peripheral surface of the projection lens lens barrel are movably connected to each other by a packing, so that the projection tube Since the relative position of the projection lens can be changed arbitrarily, the same projection unit can handle changes in screen size and projection angle. Therefore, it is not necessary to manufacture the spacer blocks of three types of red, green, and blue, or for each screen size and each projection angle, which can shorten the design time and the manufacturing cost.

Further, compared to the conventional product in which the projection tube and the projection lens can be moved, the number of sealing points for the cooling liquid is small, so there are few dangerous points for liquid leakage, and the amount of packing compression change during movement is also small. It is a structure that does not easily leak liquid.

Further, since the relative angle between the projection tube and the projection lens and the distance can be easily changed with the cooling liquid filled, the projection position and the screen size can be adjusted according to the user's request not only at the time of production but also after commercialization. Can be changed easily.

Further, since the space between the inner wall surface of the spacer block and the outer peripheral surface of the lens barrel is movably sealed by the sealing member, it can be constructed even if the distance between the projection tube and the projection lens is narrow, and the design margin Will increase.

Further, since the lens barrel is made of a material such as aluminum or plastic, it is excellent in workability, and it is easy to obtain surface accuracy, and an arbitrary shape can be produced, so that the sealing property is improved and the reliability is increased.

Further, since the inclined surface or the curved surface is formed on the spacer block or the lens barrel on which the packing is mounted so that it can be easily inserted, it is possible to improve workability at the time of insertion and to cope with variations in the clearance where the packing is mounted. It is possible to secure a certain amount of compression in the packing and improve the sealing property.

According to the projection device of the third aspect of the present invention, since the inner wall surface of the spacer block and the outer peripheral surface of the projection lens lens barrel are movably connected to each other by the packing, the projection tube is movable. Since the relative position of the projection lens can be changed arbitrarily, the same projection unit can handle changes in screen size and projection angle. Therefore, it is not necessary to manufacture the spacer blocks of three types of red, green, and blue, or for each screen size and each projection angle, which can shorten the design time and the manufacturing cost.

Further, as compared with the conventional product in which the projection tube and the projection lens can be moved, the number of sealing points for the cooling liquid is small, so there are few danger points for liquid leakage, and the amount of packing compression change during movement is also small. It is a structure that does not easily leak liquid.

Further, since the relative angle between the projection tube and the projection lens and the distance can be easily changed with the cooling liquid filled, the projection position and the screen size can be adjusted according to the user's request not only at the time of production but also after the product is commercialized. Can be changed easily.

Further, since the space between the inner wall surface of the spacer block and the outer peripheral surface of the lens barrel is movably sealed by the seal member, it can be constructed even if the distance between the projection tube and the projection lens is narrow, and the design margin is small. Will increase.

Further, since the lens barrel is made of a material such as aluminum or plastic, it is excellent in workability, and it is easy to obtain surface accuracy, and an arbitrary shape can be created, so that the sealing property is improved and the reliability is increased.

Further, since the spacer block or the lens barrel to which the packing is attached is provided with the step portion which defines the installation position of the packing, the sealing position of the packing does not move when the attitudes of the projection tube and the projection lens are changed. Therefore, in addition to being able to prevent liquid leakage, the processing cost may be reduced because the location where surface accuracy is required as the seal portion of the spacer block and the lens barrel is limited. .

According to the projection device of the fourth aspect of the present invention, since the inner wall surface of the spacer block and the outer peripheral surface of the projection lens lens barrel are movably connected to each other by the packing, the projection tube is movable. Since the relative position of the projection lens can be changed arbitrarily, the same projection unit can handle changes in screen size and projection angle. Therefore, it is not necessary to manufacture the spacer blocks of three types of red, green, and blue, or for each screen size and each projection angle, which can shorten the design time and the manufacturing cost.

Further, compared to the conventional product in which the projection tube and the projection lens can be moved, the number of sealing points for the cooling liquid is small, so there are few danger points for liquid leakage, and the amount of packing compression change during movement is also small. It is a structure that does not easily leak liquid.

Further, since the relative angle between the projection tube and the projection lens and the distance can be easily changed with the cooling liquid filled, the projection position and the screen size can be adjusted according to the user's request not only at the time of production but also after the product is commercialized. Can be changed easily.

Further, since the inner wall surface of the spacer block and the outer peripheral surface of the lens barrel are movably sealed by the sealing member, the structure can be constructed even if the distance between the projection tube and the projection lens is narrow. Will increase.

Further, since the lens barrel is made of a material such as aluminum or plastic, it is excellent in workability, and it is easy to obtain surface accuracy, and an arbitrary shape can be produced, so that the sealing property is improved and the reliability is increased.

Further, since the packing can be mounted in advance on the inner wall surface of the spacer block or the outer peripheral surface of the lens barrel, the sealing position of the packing does not move when the postures of the projection tube and the projection lens are changed and liquid leakage occurs. In addition to preventing the above, the processing cost can be reduced because the places where surface accuracy is required as the seal portion between the spacer block and the lens barrel are limited. Further, the workability is improved because the adjustment packing does not come off during assembly, and the maintenance of the projection tube or the projection lens can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a projection device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the projection device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a state where three projection units are installed in the device.

FIG. 4 is a cross-sectional view showing a modified example of the projection device in the first embodiment.

FIG. 5 is a sectional view showing a projection device according to a second embodiment of the present invention.

FIG. 6 is a main-portion cross-sectional view showing a modification of the projection device in Embodiment 2.

FIG. 7 is a sectional view showing a projection device according to a third embodiment of the present invention.

FIG. 8 is a main-portion cross-sectional view showing a modification of Example 3.

FIG. 9 is a cross-sectional view showing a configuration example in which Example 2 and Example 3 are combined.

FIG. 10 is a cross-sectional view showing another configuration example in which the second embodiment and the third embodiment are combined.

FIG. 11 is a cross-sectional view of essential parts showing a projection device in Embodiment 4 of the present invention.

FIG. 12 is a main-portion cross-sectional view showing a modification of Example 4.

FIG. 13 is a cross-sectional view showing another fastening means for the projection lens and the spacer block, and another attachment means for the projection tube.

FIG. 14 is a perspective view showing another fastening means for the projection lens and the spacer block, and another attachment means for the projection tube.

FIG. 15 is a cross-sectional view showing a conventional projection device.

FIG. 16 is an exploded perspective view showing a conventional projection device.

FIG. 17 is a cross-sectional view showing another example of a conventional projection device.

FIG. 18 is a cross-sectional view of an essential part showing the seal part of FIG. 17.

FIG. 19 is a diagram showing a projection principle of a projector.

[Explanation of symbols]

21 projection tube, 22 spacer block, 22k, 28
k inclined surface, 22m annular groove, 22r, 28r curved surface,
22s inner wall surface, 22t mounting groove, 22v hole, 22
z, 28d step, 28 projection lens, 28a barrel,
28b final lens, 28s outer peripheral surface, 29 projection tube packing, 32 cooling liquid, 47 adjusting packing, 48 spacing member, 49 adhesive, 83 projection unit, 99 screen.

Claims (4)

[Claims] 1. A projection device configured by filling a cooling liquid between a projection tube and a projection lens, wherein a spacer block is provided which holds the projection tube in a watertight state and has a hole portion through which projection light passes. A sealing member for sealing a watertight state between a final lens of the projection lens inserted into the inner wall surface of the hole of the spacer block at a predetermined interval and the outer peripheral surface of the lens barrel fixed in the watertight state. A projection device in which a spacer block and a projection lens are movably connected to each other. 2. A projection device configured by filling a cooling liquid between a projection tube and a projection lens, wherein the spacer block is provided with a hole portion for holding the projection tube in a watertight state and passing projection light. There is a watertight state between the inclined surface provided on the lens side of the hole or the curved surface and the corner surface of the lens barrel that fixes the final lens of the projection lens inserted at a predetermined interval in a watertight state. A projection device comprising a sealing member for sealing, and movably connecting a spacer block and a projection lens. 3. A projection device configured by filling a cooling liquid between a projection tube and a projection lens, the spacer block including a hole portion for holding the projection tube in a watertight state and allowing projection light to pass therethrough. Any one of the inner wall surface and the outer peripheral surface of the lens barrel in which the final lens of the projection lens inserted into the inner wall surface at a predetermined interval is fixed in a watertight state,
Alternatively, a projection is characterized in that a step portion is provided on both of them, and a seal member arranged on this step portion is provided to seal the space between the spacer block and the projection lens in a watertight state and to connect them movably. apparatus. 4. A projection device configured by filling a cooling liquid between a projection tube and a projection lens, wherein the spacer block is provided with a hole portion that holds the projection tube in a watertight state and allows projection light to pass therethrough. A seal member is provided between the inner wall surface and the outer peripheral surface of the lens barrel in which the final lens of the projection lens inserted in the inner wall surface at a predetermined interval is fixed in a watertight state. It is characterized in that it has a seal part for sealing the projection lens in a watertight state and a mounting part that can be fixed or adhered to either the spacer block or the projection lens, and the spacer block and the projection lens are movably connected. Projection device.