JP2000244848A - Projection tube unit for projector - Google Patents

Abstract

(57) [Problem] To provide a projection tube unit of a projector having a cooling device which has a simple structure and does not require polishing of a sealing surface of a packing. SOLUTION: A projection tube 1 in which a phosphor is emitted by irradiation of an electron beam and an image is projected on a face surface, and a projection surface 1a of the projection tube 1 is arranged at a predetermined distance from a face surface,
A lens 5 for enlarging and projecting the image of the face surface 1a,
It is formed in a substantially cylindrical shape using a rubber-based material, and one open end is attached to the peripheral edge of the face surface 1a while maintaining watertightness, and the other open end is attached to the peripheral edge of the lens 5 while maintaining watertightness. Black tubular member 21 and this tubular member 2
1, a coolant 19 filled in a space surrounded by the face surface 1a and the lens 5, and attached to the side surface of the cylindrical member 21 so as to keep watertight, the outside touches the atmosphere, and the inside touches the coolant. And a heat dissipating member 22 made of a metal block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection tube unit of a projector for projecting an image on a screen using a cathode ray tube as a projection tube, and more particularly, to a cooling device configured between a projection tube side and a lens side for cooling the projection tube. It is related to the improvement of.

[0002]

2. Description of the Related Art FIG. 3 is an assembly view showing a projection tube unit of a conventional projector. In the figure, 1 is red, green,
This is a CRT with a phosphor screen of one of the blue colors.
Since the image of the cathode ray tube is projected on a screen by a lens described later, the image is hereinafter referred to as a projection tube. Reference numeral 2 denotes a positioning member for positioning the projection tube 1. The positioning member 2 is a nylon frame-like member into which the peripheral edge of the face of the projection tube 1 can be press-fitted, and is provided with positioning pins (not shown). Reference numeral 3 denotes a CRT packing for sealing when mounting the projection tube 1, and 4 denotes a projection tube frame for mounting the projection tube 1 and the like. Although not shown, the frame 4 has a receiving portion for the positioning pin, and an auxiliary pin inserted toward the positioning member 2. 5
Is a lens for enlarging the image of the projection tube 1, 6 is a lens frame for attaching the lens 5, and 7 is a lens 5.
Reference numeral 8 denotes a lens screw for mounting the lens 5 to the lens frame 6 for sealing when mounting the lens.

Reference numeral 9 denotes an inlet screw for closing an inlet for injecting the cooling liquid, and reference numeral 10 denotes a screw packing for sealing when the inlet screw 9 is attached. Reference numeral 11 denotes a spring for maintaining a position when the relative angle between the projection tube frame 4 and the lens frame 6 is changed. Reference numeral 12 denotes an angle adjusting screw for adjusting the relative angle between the projection tube frame 4 and the lens frame 6 and fixing the projection tube frame 4 and the lens frame 6. Reference numeral 13 denotes an angle adjusting packing, which is used to maintain a seal even when the relative angle between the projection tube frame 4 and the lens frame 6 is freely changed. 14 is a tank holder for fixing the pressure regulating rubber, 15 is a projection tube holder for fixing the projection tube 1 to the projection tube frame 4, and 16 is a protection tube for protecting the projection tube 1 from being damaged by the projection tube holder 15. Protective rubber 17 is a projection tube fixing screw which is used to fix the projection tube 1 to the projection tube frame 4. Reference numeral 18 denotes a bracket which is a member for assembling single tube units of red, green, and blue, each of which is obtained by assembling the components 1 to 17 described above.

FIG. 4 is a sectional view of a main part of a projection tube unit of a conventional projector. FIG. 4 is a cross-sectional view taken along a plane including the tube axis of the projection tube and the screw 9 for the inlet, and both ends are omitted and only essential parts are shown. In the figure, the parts denoted by the same reference numerals as those in FIG. 3 indicate the same parts, and 1a is a face surface on which the image of the projection tube 1 is actually reflected. 19 is a coolant filled to cool the heat of the face 1a, 2
Reference numeral 0 denotes a pressure regulating rubber for releasing the pressure of the cooling liquid 19.

Next, the angle adjusting mechanism of the projection tube and the cooling device for the projection tube will be described. In the projection tube unit, the projection tube 1 is fixed to the projection tube frame 4 by the projection tube fixing screw 17. At this time, after the face surface of the projection tube 1 is pressed into the positioning member 2, the projection tube 1 and the frame 4 are positioned by inserting the above-described positioning pins and auxiliary pins into the respective receiving portions. The lens 5 is fixed to the lens frame 6 by a lens screw 8. A spring 11 is sandwiched between the frames, and an angle adjusting screw 12 is screwed into the projection tube frame 4 through the spring 11. Therefore, by changing the screwing height of the angle adjusting screw 12, the angle of the lens frame 6 with respect to the projection tube frame 4 can be freely changed. That is, the relative angle between the tube axis of the projection tube 1 and the optical axis of the lens 5 can be freely changed.

Also, when the angle of the lens frame 6 with respect to the projection tube frame 4 is changed, and when the coolant 19 expands or cools and contracts due to heat generated on the face surface 1a, the coolant 19 The volume fluctuates. The fluctuation in the volume is absorbed by the pressure regulating rubber 20 deforming up and down. The heat generated on the face 1a is absorbed by the coolant 19 to suppress an excessive rise in temperature on the face 1a, and the heat is radiated into the air by the projection tube frame 4 and the lens frame 6 serving as a medium. are doing. further,
Light from the image projected on the face surface 1a is reflected on the inner surfaces of the projection tube frame 4 and the lens frame 6 to lower the contrast of the image. To prevent this, the inner surface of each frame is black. It is black due to alumite treatment. The portion that needs to be black is the inner surface, that is, the portion that is in contact with the coolant 19,
Since it is difficult to anodize a part of the frame, the entire frame is black anodized.

[0007]

In the above-described conventional projection tube unit of the projector, when the relative angle between the projection tube 1 and the lens 5 is changed or when the heat generated on the face 1a, the coolant 19 A tank unit is provided as a means for absorbing a volume fluctuation of the cooling liquid 19 when the air expands or cools and contracts. This tank portion is provided with a reservoir for storing the cooling liquid 19 at the upper part of the projection tube frame 4, and the pressure regulating rubber 20 is fixed to the reservoir using the tank holder 14, and the pressure regulating rubber 20 is deformed up and down. By doing so, volume fluctuations are absorbed. Therefore, there is a problem that the structure becomes complicated. Also, since the projection tube frame 4 and the lens frame 6 are subjected to black alumite treatment, the surface of the product is rough due to the nature of the alumite treatment, so that the projection tube frame 4 and the lens frame 6 are sealed by respective packings. Has to be polished.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A black cylindrical member formed in a substantially cylindrical shape by using a rubber-based material for packing is prepared. The open end is attached to the periphery of the face of the projection tube in a watertight manner, and the other open end is attached to the periphery of the lens in a watertight manner, and is surrounded by the tubular member, the face of the projection tube and the lens. The space filled with the cooling liquid, furthermore, the outside of the cylindrical member is kept airtight and the outside touches the atmosphere,
By providing a heat dissipating member consisting of a metal block attached so that the inside touches the cooling liquid, the structure of the cooling device is simplified, black alumite treatment is not required, and as a result, polishing of the surface sealed by the packing is unnecessary. It is an object of the present invention to obtain a projection tube unit of a projector.

[0009]

SUMMARY OF THE INVENTION A projection tube unit of a projector according to the present invention includes a projection tube in which a phosphor is emitted by irradiation of an electron beam and an image is projected on a face surface. A lens that is placed at a distance and magnifies and projects the image on the face,
It was formed in a substantially cylindrical shape using a rubber-based material, and one opening end was attached to the peripheral edge of the face surface in a watertight manner, and the other opening end was attached to the peripheral edge of the lens in a watertight manner. The black cylindrical member, the cooling liquid filled in the space surrounded by the cylindrical member, the face surface, and the lens, and the outer side is exposed to the atmosphere while the outer side is exposed to the air while the inner side is the cooling liquid. And a heat-dissipating member made of a metal block attached so as to be touched.

Further, a bellows-like expansion / contraction part is formed in the tubular member. Further, the radiating member is provided with a fin that contacts the atmosphere and a fin that contacts the coolant. Further, the heat dissipation member is provided with a coolant inlet for injecting coolant from outside. Further, a bellows-shaped expansion / contraction part is formed on the tubular member, and a fin that contacts the air and a fin that contacts the cooling liquid are formed on the heat dissipating member, and a cooling liquid inlet for injecting the cooling liquid from the outside is provided. Is what it is. Furthermore, ethylene-propylene rubber is used as the rubber-based material, and aluminum is used as the metal.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a sectional view showing Embodiment 1 of the present invention, and is a sectional view taken along a plane including a tube axis of a projection tube and a screw for a cooling liquid inlet. FIG. 2 is an assembly view showing the first embodiment of the present invention. In FIGS. 1 and 2, portions denoted by the same reference numerals as those in FIGS. 3 and 4 indicate the same portions, and description thereof will be omitted. Reference numeral 21 denotes a cylindrical member formed in a substantially cylindrical shape using a rubber-based material for packing (ethylene propylene rubber in the first embodiment). As shown in FIG. 2, the cylindrical member 21 has an opening end on the side of the projection tube 1 formed in a rectangular shape according to the shape of the peripheral portion of the face surface and a rectangular flange portion 21a. A circular flange 2 is provided at the opening end on the lens 5 side.
1b is formed. Further, a mounting portion for a heat radiating member 22 to be described later is formed on the side surface, and the
1c is formed. Although not shown in FIG. 2, O-rings 21d, 21e, and 21f are integrally formed on the respective peripheral edges of the flanges 21a, 21b, and 21c. The O-rings 21d, 21e, and 21f are referred to as an integrated O-ring. In addition, the collar 21c
Is provided at a position that becomes an upper portion when assembled as a projection tube unit. The thickness of the cylindrical member 21 is about 0.5 to 1 mm except for the part of the integral O-ring.

Further, when viewed in the tube axis direction of the projection tube 1, the cylindrical member 21 has a circular shape except for the vicinity of the flanges 21a and 21c. 21g is formed. The tubular member 21 is colored black, which is the normal color of the packing. Reference numeral 22 denotes a heat radiating member for radiating heat of the cooling liquid 19, which is a metal block formed of a metal (aluminum in the first embodiment) in a substantially rectangular shape. The heat dissipating member 22 has a fin 22a on one side and a fin 2a on the opposite side.
2b is formed. Further, a coolant inlet 22c for injecting the coolant 19 is provided. The coolant inlet 22c penetrates in the direction from the fins 22a toward the fins 22b, and a female screw for the inlet screw 9 is cut. The heat dissipating member 22 is painted in black in order to prevent light from an image projected on the face surface 1a of the projection tube 1 from being reflected. This black coating may be applied only to the portion that contacts the cooling liquid 19.

Next, the cooling device will be described. First,
The flange 21a is sandwiched between the face surface 1a and the projection tube frame 4 so that the integrated O-ring 21d enters the groove provided in the projection tube frame 4, and the projection tube fixing screw 17 is tightened. Although not shown, the projection tube frame 4 includes
A female screw for the projection tube fixing screw 17 is provided. In this manner, one open end of the tubular member 21 is attached to the face surface 1a while maintaining watertightness. At this time, the projection tube 1 and the frame 4 are positioned by the positioning member 2 as in the conventional example. Next, the integrated O-ring 21e
Into the groove provided in the lens frame 6,
The flange 21b is sandwiched between the flange 5a of the lens 5 and the lens frame 4, and the lens screw 8 is screwed into a female screw provided on the lens frame 6 and tightened. In addition,
The lens 5 includes a plurality of lenses, and these lenses are held in a cylinder having a flange 5a. Also,
Some lenses are directly attached to the flange 5a. Therefore, the other open end of the cylindrical member 21 attached as described above is attached to the peripheral edge of the lens 5 while maintaining watertightness.

The bracket 18 is fixed to the lens frame 6 by a bracket fixing screw 23. Since the bracket 18 has a hole larger than the outer shape of the flange portion 5a of the lens 5, the bracket 18 is irrespective of the bracket 18. The flange 21b can be sandwiched and tightened between the flange 5a of the lens 5 and the lens frame 4. further,
The flange 21c is sandwiched between the heat dissipating member attaching portion 6a and the heat dissipating member 22 so that the integrated O-ring 21f enters the groove provided in the heat dissipating member attaching portion 6a of the lens frame 6, and a heat dissipating member attaching screw (not shown) Tighten. In this way, the heat radiating member 22 is attached to the tubular member 21 while maintaining watertightness. The fins are attached such that the fins 22b enter the inside of the tubular member 21 so that the fins 22a extend outside the tubular member 21. In addition, when assembled as a projection tube unit, the heat radiating member attaching portion 6a
It is provided in a position to be the upper part. Next, face 1
a, A space surrounded by the cylindrical member 21, the lens 5, and the heat radiating member 22 is filled with the coolant 19. The cooling liquid 19 is filled by injecting the cooling liquid 19 from the cooling liquid
Fill until touching b.

Since the cooling device is configured as described above, the cooling liquid 1 is generated by the heat generated on the face 1a of the projection tube 1.
When 9 is heated, the hot liquid collects on the upper side and the cool liquid collects on the lower side, and the heat is radiated through the heat radiating member 22. Heat dissipation member 2
2 has a fin 22a on the atmosphere side to enhance the heat radiation effect.
Since the fins 22b are provided on the coolant side, the same amount of heat radiation as in the conventional example can be maintained. Since the heat dissipation member 22 is provided with the coolant injection port 22c, the coolant can be injected by the same method as in the related art. Therefore,
There is no need to use special technology, and the equipment can be diverted.

The angle adjusting mechanism is substantially the same as that shown in FIGS. That is, the spring 1 is provided between each frame.
1 is inserted, and the angle adjusting screw 12 is screwed into the lens frame 6 through a through hole formed in the projection tube frame 4 and a spring 11. Therefore,
By changing the screwing height of the angle adjusting screw 12,
Lens frame 6 to projection tube frame 4 freely
Angle can be changed. That is, the projection tube frame 4 and the lens frame 6 are supported so as to be adjustable in angle by using a spring 11 and an angle adjusting screw 12, and the relative angle between the tube axis of the projection tube 1 and the optical axis of the lens 5. Can be changed freely.

Next, when the angle adjusting screw 12 is operated to change the angle of the lens frame 6 with respect to the projection tube frame 4 and when the temperature of the coolant 19 changes, the coolant 1
9 can be absorbed by the expansion and contraction of the bellows-like expansion and contraction portion 21g. Further, since the tubular member 21 is attached to the inside of the projection tube frame 4 and the lens frame 6 and is black, it has an effect of preventing reflection of image light. Therefore, the black alumite treatment of the projection tube frame 4 and the lens frame 6 becomes unnecessary.

In the first embodiment, the heat dissipating member 22
Since the fins 22a and 22b are provided, the heat radiation efficiency is good. However, even if the metal block is not provided with the fins, a certain heat radiation effect can be obtained. Further, since the heat dissipating member 22 is provided on the upper portion (the upper portion in a state where the projection tube unit is assembled), the heat dissipating efficiency is improved. Is obtained. Further, the heat dissipating member 22
Is provided with a coolant injection port 22c, so that the coolant injection operation is ready.
By attaching 2, the formation of the coolant inlet 22c can be omitted. Further, the bellows-like elastic portion provided on the cylindrical member is formed on the entire side surface, but may be a part instead of the whole as long as the volume fluctuation of the coolant 19 can be absorbed. Further, since the material itself has elasticity, a certain volume fluctuation absorbing effect can be obtained without forming an elastic part.

[0019]

As described above, according to the present invention, a projection tube in which a phosphor is emitted by irradiation of an electron beam and an image is projected on a face surface, and a predetermined distance from the face surface of the projection tube are provided. A lens for enlarging and projecting an image on the face surface and a substantially cylindrical shape made of a rubber-based material, one opening end of which is attached to the peripheral edge of the face surface in a watertight manner, and the other opening end Is attached to the periphery of the lens in a watertight manner, a black tubular member, a coolant filled in the space surrounded by the tubular member, the face surface and the lens, and a watertight seal on the side surface of the tubular member. And a heat-dissipating member consisting of a metal block attached so that the outside touches the atmosphere and the inside touches the coolant, so that the number of parts of the cooling device of the projection tube unit of the projector is reduced. It can be simplified. In addition, there is an effect that polishing of the sealing surface of the packing is not required.

Further, since the bellows-shaped expansion and contraction portion is formed in the cylindrical member, the efficiency of absorbing the volume fluctuation of the coolant is good.

Further, since the heat dissipating member is formed with the fins that contact the atmosphere and the fins that contact the coolant, the heat radiation efficiency is good.

Further, since the cooling liquid injection port for injecting the cooling liquid from the outside is provided in the heat radiating member, the cooling liquid can be injected by the same method as in the related art, and the equipment can be used.

Further, since a bellows-shaped expansion and contraction portion is formed in the cylindrical member, and a fin that contacts the atmosphere and a fin that contacts the coolant are formed in the heat radiating member, and a cooling liquid inlet is provided. Good cooling fluid volume fluctuation absorption efficiency and heat dissipation efficiency. In addition, the cooling liquid can be injected by the same method as in the related art, and the equipment can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing Embodiment 1 of the present invention.

FIG. 2 is an assembly diagram showing the first embodiment of the present invention.

FIG. 3 is an assembly view showing a projection tube unit of a conventional projector.

FIG. 4 is a sectional view of a main part of a projection tube unit of a conventional projector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection tube, 1a face surface, 4 projection tube frame, 5 lens, 6 lens frame, 11 spring, 12 angle adjustment screw, 18 bracket, 19
Coolant, 21 cylindrical member, 21d to 21f integrated O-ring, 21g bellows-like expansion and contraction part, 22 heat radiation member, 2
2a, 22b Fin, 22c Coolant inlet.

Claims (6)

[Claims] 1. A projection tube in which a phosphor is emitted by irradiation of an electron beam and an image is projected on a face surface. The projection tube is arranged at a predetermined distance from the face surface of the projection tube, and the image on the face surface is enlarged. And a lens that is formed into a substantially cylindrical shape using a rubber-based material, one of the opening ends is attached to the peripheral edge of the face surface in a watertight manner, and the other opening end is the peripheral edge of the lens. A black tubular member attached in a watertight manner, a cooling liquid filled in a space surrounded by the tubular member, the face surface and the lens, and a watertight surface on the side surface of the tubular member. A projection tube unit for a projector, comprising: a heat-dissipating member formed of a metal block attached so that the outside touches the atmosphere and the inside touches the coolant. 2. A projection tube unit for a projector according to claim 1, wherein a bellows-shaped expansion / contraction part is formed on the cylindrical member. 3. The projection tube unit for a projector according to claim 1, wherein the radiating member includes a fin that contacts the atmosphere and a fin that contacts the coolant. 4. The projection tube unit for a projector according to claim 1, wherein the heat radiating member is provided with a coolant inlet for injecting coolant from outside. 5. A bellows-shaped expansion / contraction part is formed in the cylindrical member, and a fin that contacts the atmosphere and a fin that contacts the cooling liquid are formed in the heat radiating member, and a cooling liquid inlet for injecting the cooling liquid from the outside is provided. The projection tube unit of the projector according to claim 1, wherein the projection tube unit is provided. 6. The projection tube unit for a projector according to claim 1, wherein the cylindrical member uses ethylene propylene rubber as the rubber-based material and aluminum as the metal.