JPH0767063A - Fitting structure for projector tube - Google Patents

Abstract

PURPOSE:To provide structure for decreasing danger in the destruction of a projector tube, improving focus performance and easily exchanging the projector tube concerning the projector tube fitting structure for a projector or the like. CONSTITUTION:Both a panel part 21a to display an image and a neck part 21 c to load/unload a deflecting yoke and a focus magnet are linked on the curved face of a projector tube 21 like a cathode ray tube. At such a funnel part 21b, the outer peripheral curved face part of the funnel part 21b near the panel part away from the deflecting yoke is pressed by an abutting member so that the projector tube can be installed at a fitting member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mounting structure for a projection tube such as a cathode ray tube used in a projector or the like.

[0002]

2. Description of the Related Art FIG. 13 is a sectional view of a main part of a projection device of a conventional projector disclosed in Japanese Utility Model Publication No. 2-41979, and FIG. 14 is an exploded perspective view thereof. In the figure, 2
Reference numeral 1 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. A boss portion 22c having a wall portion 22b and a screw hole 22d is provided on the projection tube installation surface 22f side of the spacer block 22.
Is provided. Reference numeral 23 is the funnel portion 2 of the projection tube 21.
Flat portion 2 that abuts a supporting portion 21d that is formed by projecting on 1b
It is a pressing plate having 3a. In order to press the holding plate 23 uniformly, one end of the boss 2 of the spacer block 22 passes through the mounting holes 23b provided at the four corners of the holding plate 23.
The post 24 that comes into contact with 2c and the spring 25 are installed on the outer periphery of the post 24 so that one end thereof comes into contact with the pressing plate 23. Further, the projection tube 21 is fixed to the spacer block 22 by the pressing force of the spring 25 by passing the screw 27 inserted through the washer 26 through the post 24 and tightening the screw hole 22d of the boss portion 22c.

On the other hand, the lens barrel 28a of the projection lens 28 is provided on the side of the spacer block 22 opposite to the projection tube installation surface 22f side.
Are attached with screws 35. At this time, the projection tube 21
Between the face surface 21f on the front surface of the panel portion 21a of the panel 21a and the projection tube installation surface 22f, and the final lens surface 28b of the projection lens 28 and the lens installation surface 22g of the spacer block 22.
A projection tube packing 29 and a lens packing 30 are respectively installed between and so that the space 31 surrounded by the projection tube 21, the projection lens 28 and the spacer block 22 is kept watertight. 36 and 37 are the neck portion 2 of the projection tube 21.
Denoted at 1c are a deflection yoke and a focus magnet, and 38 is a CRT substrate installed at the rear of the projection tube 21.

32 is filled with a cooling refrigerant liquid such as ethylene glycol or silicon oil in the space 31, and transfers the heat generated on the face surface 21f of the projection tube 21 to the spacer block 22 when the projector is in operation to radiate the heat to the outside. It is supposed to be done. Further, the cooling refrigerant liquid 32 is made of a material having a refractive index equivalent to that of glass, which is a material of the projection tube 21 and the projection lens 28, and the light from the projection tube 21 irradiates the projection lens 28 without irregular reflection. Therefore, the contrast is prevented from being lowered. A tank portion 33 regulates the temperature expansion of the cooling refrigerant liquid 32.

As another conventional example, Japanese Patent Laid-Open No. 63-67978
FIG. 15 is a cross-sectional view of the main part of the projection device of the projector shown in the publication. In the figure, 22 is a spacer block made of a material having good heat conduction such as aluminum,
The projection lens 28 is fixed by the adhesive material 11. Reference numeral 21 denotes a projection tube such as a cathode ray tube, in which a ring-shaped spacer 12 with a tilt is brought into contact with a face surface 21f which is the front surface of the panel portion 21a, and the side surface has a positioning band 13 and a wall portion 22b of the spacer block 22. After being installed between the two and arranged at a predetermined position, they are fixed with an adhesive material 11. Reference numeral 32 is a cooling refrigerant liquid filled in a space 31 surrounded by the projection tube 21, the projection lens 28, and the spacer block 22.

[0006]

Since the structure for mounting the projection tube in the conventional projector projection apparatus is configured as described above, when the projection tube is pressed by the holding plate as a method for mounting the projection tube on the spacer block. ,
Since the funnel portion of the projection tube is a three-dimensional curved surface and the contact point is point contact, a convex support portion is provided on the funnel portion of the projection tube so that the holding plate makes surface contact. However, if a convex support is formed on the projection tube, it will become a wall thickness part and internal stress will concentrate, and it will break from the stress concentration part due to the pressing force during installation and repeated thermal expansion and contraction during operation and non-operation. There is a problem of danger.

Further, there is a problem that a pressing plate corresponding to the size of the projection tube is required.

Further, when the projection tube and the spacer block are adhesively fixed, when the projection tube is replaced, the spacer block also needs to be replaced at the same time, which results in an increase in service cost, and it takes time to cure the adhesive. There is a problem in that it is difficult to enclose air at the time of bonding and attach it in a watertight state.

The present invention has been made in order to solve the above problems, and the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube is used as the abutting portion of the projection tube mounting member. An object of the present invention is to obtain a structure in which the risk of destruction is reduced and the projection tube can be easily replaced.

[0010]

According to a first aspect of the present invention, there is provided a projection tube mounting structure according to the first aspect of the present invention, wherein the curved surface near the panel portion of the outer periphery of the funnel portion of the projection tube is pressed against the cabinet by an abutting member to mount the projection tube. It is a thing.

According to a second aspect of the present invention, in a projection tube used in a projection device of a projector, the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube is pressed against the spacer block by a flexible contact member to mount the projection tube. It is a thing.

According to a third aspect of the present invention, the projection tube is attached by pressing the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube or the curved surface from the funnel portion to the panel portion against the spacer block with a plurality of contact members. Is.

According to a fourth aspect of the present invention, the projection tube is attached by a frame-shaped block that covers the entire circumference of the panel section of the projection tube and is brought into contact with the curved surface near the panel section on the outer periphery of the funnel section of the projection tube.

According to a fifth aspect of the present invention, the projection tube is attached by pushing a wedge-shaped contact member between the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube and the wall portion of the spacer block.

In the structure for mounting the projection tube according to the present invention, the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube is pressed by the abutting member. It can be molded in thickness. Therefore, the stress concentration generated in the wall thickness change portion is eliminated, and the pressing force at the time of attachment and the risk of breakage due to thermal expansion during operation are reduced.

Further, since the curved surface from the funnel portion of the projection tube to the panel portion or its vicinity is pressed by a plurality of contact members, the same contact member is used even if the size of the projection tube is changed. It is possible to standardize parts.

Further, it is possible to cover the glass pieces with a contact member so as not to scatter when the projection tube is broken.

Further, since the projection tube and the spacer block are not adhered to each other, it does not take much time to mount the projection tube and the projection tube can be easily replaced.

[0018]

EXAMPLES Example 1. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a mounting structure of a projection tube according to the first embodiment. In the figure, reference numeral 21 is a projection tube such as a cathode ray tube, and a projection tube band 41 is in contact with the funnel portion 21b in the vicinity of the panel portion 21a via a rubber sheet 42 as a cushioning material. The projection tube band 41 is made of a thin plate made of stainless steel and has both rigidity and flexibility, so that it can be brought into contact with the outer peripheral curved surface of the funnel portion 21b.

Reference numeral 1 denotes a cabinet of a television or the like, in which an opening 1a through which light of the projection tube 21 passes and a mounting boss 1b are provided at predetermined positions. By fastening the projection tube band 41 to the mounting boss 1b with the screw 27, the projection tube 21 is installed in the cabinet 1 sandwiched between the projection tube band 41 and the peripheral edge of the opening 1a of the cabinet 1. At this time, the mounting portion 41a of the projection tube band 41
Since the boss 1b of the cabinet 1 and the boss 1b of the cabinet 1 have a dimensional relationship such that there is a gap therebetween, the flexibility of the projection tube band 41 can be utilized to tighten the outer peripheral curved surface of the funnel portion 21b of the projection tube 21. There is.

Reference numeral 39 is an anode cap for applying a high voltage to the projection tube 21, and reference numeral 36 is a deflection yoke for controlling the direction of the electron beam in the projection tube 21. Also,
Reference numeral 37 is a focus magnet, and 38 is a CRT substrate.

The projection tube mounting structure according to the first embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface of 1b can be pressed down and attached to the cabinet 1, a convex supporting portion is unnecessary, and the projection tube 21
Can be molded with a uniform thickness, and the projection tube can be easily attached.

Example 2. FIG. 2 is a perspective view showing a mounting structure of a projection tube according to the second embodiment, FIG. 3 is a sectional view of a main part thereof, and FIG. 4 is an exploded perspective view showing the entire projection unit. In the figure, reference numeral 21 denotes a projection tube such as a cathode ray tube, which is a funnel portion 21.
Since the glass and the metal do not directly contact with each other, the projection tube band 41 is in contact with the vicinity of the panel portion 21a of b through the rubber sheet 42 as a cushioning material. The projection tube band 41 is made of a rigid thin plate such as a stainless steel plate connected in an annular shape, and has both rigidity and flexibility, so that it can also come into contact with the outer peripheral curved surface of the funnel portion 21b.

Reference numeral 22 denotes a spacer block provided with an opening 22h corresponding to the image of the projection tube 21, and an annular groove 22m is formed around the opening 22h of the projection tube installation surface 22f of the spacer block. . This annular groove 22
The projection tube packing 29 is attached to the
The projection tube band 41 is tightened with the screw 27 so that the face surface 21f, which is the front surface of the first panel portion 21a, and the spacer block 22 are watertight. At this time, the mounting portion 41a of the projection tube band 41 and the spacer block 2
Since there is a dimensional relationship such that there is a gap with the screw hole 22p of the second projection tube 2, the flexibility of the projection tube band 41 is fully utilized.
The structure is such that the curved surface of the first funnel portion 21b can be tightened.

On the other hand, the opening 2 is formed on the lens installation surface 22g of the spacer block 22 opposite to the projection tube installation surface 22f.
An annular groove 22n is formed around 2h. A lens packing 30 is attached to the annular groove 22n, and the lens barrel 22a of the projection lens 28 and the spacer block 22 are fastened with a screw 27 so that the final lens surface 28b and the spacer block 22 are in a watertight state.

After the projection tube 21 and the projection lens 28 are mounted on the spacer block 22 in a watertight manner in a predetermined posture in this way, a cooling medium is cooled in a space 31 surrounded by the projection tube 21, the projection lens 28 and the spacer block 22. The liquid 32 is filled to form the projection unit 83 of the projector. Therefore, the projection tube 21 is prevented from leaking the cooling refrigerant liquid 32.
It is necessary to firmly attach the projection lens 28 and the projection lens 28 to the spacer block 22, and a mounting member for the projection tube 21 having particularly different dimensions is important.

The projection tube mounting structure according to the second embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface portion of 1b can be pressed and attached to the spacer block 22, a convex supporting portion is not necessary, and the projection tube 21 can be formed with a uniform thickness.

Further, the projection tube band 41 has the panel portion 21a.
Since it is installed near the deflection yoke 36, it has a sufficient distance from the deflection yoke 36 attached to the neck portion 21c, and the magnetic field of the projection tube band 41 or the eddy current does not affect the deflection yoke 36 and the focusing performance is not impaired.

Further, since the projection tube 21 is not fixed by adhesion, it does not take much time for installation and the projection tube 21 can be easily replaced.

FIG. 5 is a perspective view showing a modification of the second embodiment. The projection tube band 41 is made of a rigid thin plate such as a stainless steel plate, and is configured to independently press the corners of the four corners of the funnel portion 21b near the panel portion 21a of the projection tube 21. In this case, in addition to the above operation, the number of parts and the mounting screw 27 are increased, but even if the size of the projection tube is changed, the same projection tube band 41 can be used for mounting.

Example 3. FIG. 6 is a perspective view showing a projection tube mounting structure according to the third embodiment, and FIG. 7 is a cross-sectional view of a main part thereof. In the figure, reference numeral 21 is a projection tube such as a cathode ray tube, and a rubber sheet 4 is used as a cushioning material in the vicinity of the panel portion 21a of the funnel portion 21b so that glass and metal do not come into direct contact.
The fixing block 44 is in contact with the contact point 2 through. The fastening block 44 is made of a rigid body such as aluminum and holds the projection tube 21 from the left and right, so that it can be spaced a predetermined distance from the anode cap 39.

Reference numeral 22 denotes a spacer block provided with an opening 22h corresponding to the image of the projection tube 21, and an annular groove 22m is formed around the opening 22h on the projection tube installation surface 22f of the spacer block. . This annular groove 22
The projection tube packing 29 is attached to the
The projection tube 2 is arranged such that the face surface 21f, which is the front surface of the panel portion 21a of No. 1, and the spacer block 22 are in a watertight state.
Press the fastening block 44 onto 1. The pressing structure is as follows.

That is, the fastening block 44 is provided with a taper portion 44a substantially along the outer peripheral curved surface of the funnel portion 21b of the projection tube 21, and the taper portion 44a abuts the projection tube 21. In addition, the spacer block 22
A screw hole 22d is provided on the side of the projection tube installation surface 22f. In order to press the fastening block 44 evenly, one end of the post 24, whose one end abuts the projection tube installation surface 22f of the spacer block 22 through a mounting hole 44b provided in the fastening block 44, and a spring 25 on one end of the post 24. Are installed so as to abut the fastening block 44. Furthermore, the projection tube 21 is fixed to the spacer block 22 by the pressing force of the spring 25 by passing the screw 27 inserted through the washer 26 through the post 24 and tightening the screw hole 22d.

On the other hand, the opening 2 is formed on the lens installation surface 22g of the spacer block 22 opposite to the projection tube installation surface 22f.
An annular groove 22n is formed around 2h. A lens packing 30 is attached to the annular groove 22n, and the lens barrel 22a of the projection lens 28 and the spacer block 22 are fastened with a screw 27 so that the final lens surface 28b and the spacer block 22 are in a watertight state.

After the projection tube 21 and the projection lens 28 are mounted on the spacer block 22 in a watertight manner in a predetermined posture in this manner, a cooling medium is cooled in a space 31 surrounded by the projection tube 21, the projection lens 28 and the spacer block 22. The liquid 32 is filled to form the projection unit 83 of the projector. Therefore, the projection tube 21 is prevented from leaking the cooling refrigerant liquid 32.
It is necessary to firmly attach the projection lens 28 and the projection lens 28 to the spacer block 22, and a mounting member for the projection tube 21 having particularly different dimensions is important.

The projection tube mounting structure in the third embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface of 1b can be pressed and attached to the spacer block 22, a convex supporting portion is not necessary, and the projection tube 21 can be formed with a uniform thickness.

The projection tube mounting member is the panel portion 21a.
Since it is installed near the deflection yoke 36, it has a sufficient distance from the deflection yoke 36 attached to the neck portion 21c, and the influence of the magnetic field and the eddy current of the fastening block 44 does not affect the deflection yoke 36 and the focusing performance is not impaired.

Further, since the projection tube 21 is not fixed by adhesion, the installation time is short and the projection tube 21 can be easily replaced.

FIG. 8 is a perspective view showing a modification of the third embodiment. The fastening block 44 is made of a rigid material such as aluminum, and is configured to independently press the corners of the four corners of the funnel portion 21b near the panel portion 21a of the projection tube 21. In this case, in addition to the above operation, the number of parts is increased, but even if the size of the projection tube is changed, the same fixing block 44 can be attached.

Example 4. FIG. 9 is a perspective view showing the attachment structure of the projection tube in the fourth embodiment. In the figure, reference numeral 21 is a projection tube such as a cathode ray tube, and a fastening block 44 is in contact with the funnel portion 21b in the vicinity of the panel portion 21a via a rubber sheet 42 as a cushioning material so that glass and metal do not come into direct contact with each other. The fastening block 44 is made of a rigid body such as aluminum and has a panel portion 21 a of the projection tube 21.
It is formed of a frame body surrounding the funnel portion 21b in the vicinity. Further, since the notch portion 44c is provided at the position where the anode cap 39 is attached, the anode cap 39 and the fixing block 44 are separated by a predetermined distance.

Since the sectional shape showing the fourth embodiment is the same as that of the third embodiment, it will be described below with reference to FIG. A spacer block 22 is provided with an opening 22h corresponding to the image of the projection tube 21, and an annular groove 22m is formed around the opening 22h on the projection tube installation surface 22f of the spacer block. A projection tube packing 29 is provided in the annular groove 22m.
Is attached, and the fastening block 44 is pressed against the projection tube 21 so that the face surface 21f of the projection tube 21 and the spacer block 22 are watertight. The pressing structure is the same as that of the third embodiment, and the description thereof will be omitted.

Further, an annular groove 22n is formed around the opening 22h on the lens installation surface 22g of the spacer block 22 opposite to the projection tube installation surface 22f. A lens packing 30 is attached to the annular groove 22n,
The lens barrel 22a of the projection lens 28 and the spacer block 22 are fastened with screws 27 so that the final lens surface 28b and the spacer block 22 are in a watertight state.

In this way, the projection tube 21 and the projection lens 28 are attached to the spacer block 22 in a watertight state in a predetermined posture, and then cooled in the space 31 surrounded by the projection tube 21, the projection lens 28 and the spacer block 22. The projection unit 83 of the projector is configured by filling the coolant liquid 32.
Therefore, the projection tube 2 is prevented from leaking the cooling refrigerant liquid 32.
1 and the projection lens 28 need to be firmly attached to the spacer block 22, and an attachment member for the projection tube 21 whose size varies is particularly important.

The projection tube mounting structure according to the fourth embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface of 1b can be pressed and attached to the spacer block 22, a convex supporting portion is not necessary, and the projection tube 21 can be formed with a uniform thickness.

The projection tube mounting member is the panel portion 21a.
Since it is installed near the deflection yoke 36, it has a sufficient distance from the deflection yoke 36 attached to the neck portion 21c, and the influence of the magnetic field and the eddy current of the fastening block 44 does not affect the deflection yoke 36 and the focusing performance is not impaired.

Further, since the projection tube 21 is not fixed by adhesion, the installation time is short, and the projection tube 21 can be easily replaced.

Further, since the fastening block 44 is connected in a frame shape, the rigidity of the fastening block 44 itself is increased, and in addition, as compared with the independent fastening block 44, the mounting hole 44 is provided.
The projection tube 21 can be firmly attached to the spacer block 22 because it does not incline by the backlash of b, and the glass block scatters because of the strong fastening block 44 even if the projection tube is imploded. Can be prevented.

Example 5. FIG. 10 is a cross-sectional view of essential parts showing the structure for mounting the projection tube in the fifth embodiment. In the figure,
Reference numeral 21 denotes a projection tube such as a cathode ray tube, and a fastening block 44 is in contact with the funnel portion 21b in the vicinity of the panel portion 21a via a rubber sheet 42 as a cushioning material so that glass and metal do not come into direct contact with each other. The fastening block 44 is made of a rigid material such as aluminum and has a wedge-shaped cross section. In the mounting structure, the tapered portion 44a abuts and presses the projection tube 21, and the outer surface 44d on the opposite side of the tapered portion 44a has the spacer block 22.
The block 22 is also brought into contact with the wall portion 22b provided on the side.
Restrict outside of 4.

Reference numeral 22 denotes a spacer block provided with an opening 22h corresponding to the image of the projection tube 21, and an annular groove 22m is formed around the opening 22h of the projection tube installation surface 22f of the spacer block. . This annular groove 22
The projection tube packing 29 is attached to the
The fastening block 44 is pressed against the projection tube 21 so that the face surface 21f of No. 1 and the spacer block 22 are in a watertight state. The pressing structure is the same as that of the third embodiment, and the description thereof will be omitted.

Further, an annular groove 22n is formed around the opening 22h on the lens installation surface 22g of the spacer block 22 opposite to the projection tube installation surface 22f. A lens packing 30 is attached to the annular groove 22n,
The lens barrel 22a of the projection lens 28 and the spacer block 22 are fastened with screws 27 so that the final lens surface 28b and the spacer block 22 are in a watertight state.

In this way, the projection tube 21 and the projection lens 28 are attached to the spacer block 22 in a watertight state in a predetermined posture, and then cooled in the space 31 surrounded by the projection tube 21, the projection lens 28 and the spacer block 22. The projection unit 83 of the projector is configured by filling the coolant liquid 32.
Therefore, the projection tube 2 is prevented from leaking the cooling refrigerant liquid 32.
1 and the projection lens 28 need to be firmly attached to the spacer block 22, and an attachment member for the projection tube 21 whose size varies is particularly important.

The projection tube mounting structure according to the fifth embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface of 1b can be pressed and attached to the spacer block 22, a convex supporting portion is not necessary, and the projection tube 21 can be formed with a uniform thickness.

The projection tube mounting member is the panel portion 21a.
Since it is installed near the deflection yoke 36, it has a sufficient distance from the deflection yoke 36 attached to the neck portion 21c, and the influence of the magnetic field and the eddy current of the fastening block 44 does not affect the deflection yoke 36 and the focusing performance is not impaired.

Further, since the projection tube 21 is not fixed by adhesion, it does not take much time for installation, and the projection tube 21 can be replaced easily.

Further, since the outer surface of the fastening block 44 is restricted from escaping to the outside by the wall portion 22b of the spacer block 22, even if the mounting hole 44b and the screw 27 have rattling, they can be installed without tilting. .

FIG. 11 is a sectional view showing a modification of the fifth embodiment. The fixing block 44 contacts the funnel portion 21b of the projection tube 21 at the tapered portion 44a while being restricted by the wall portion 22b of the spacer block 22. At this time, as a method of pressing the fastening block 44, the same effect can be obtained even with a structure that utilizes the force of the leaf spring 45 installed in the spacer block 22.

In the third, fourth and fifth embodiments, the spring force is used as the force for pressing the fastening block.
When the projection block 21 is attached to the spacer block 22 by tightening the fastening block 44 directly with the screw 27 and controlling the tightening torque as in 2, it is possible to expect an effect that the number of parts can be significantly reduced in addition to the above effect. .

Further, since the contact member is arranged in the funnel portion 21b near the panel portion 21a for the purpose of preventing the influence of the magnetic field from the contact member on the deflection yoke 36, the funnel portion 21 is arranged.
The present invention may be applied to the projection tube 21 having the support portion formed on b.

[0058]

As described above, in the projection tube mounting structure according to the present invention, the projection tube is mounted by pressing the outer peripheral curved surface of the funnel portion near the panel portion of the projection tube with the contact member.
Since the projection tube does not need a convex supporting portion, the projection tube can be formed with a uniform thickness.

Further, since the projection tube 21 is not fixed by adhesion, it does not take much time for installation, and the projection tube 21 can be easily replaced.

The projection tube mounting member is the panel portion 21a.
Since it is installed near the deflection yoke 36, it has a sufficient distance from the deflection yoke 36 attached to the neck portion 21c, and the influence of the magnetic field and the eddy current of the fastening block 44 does not affect the deflection yoke 36 and the focusing performance is not impaired.

Even if the size of the projection tube is changed, the same projection tube mounting member can be used.

Further, even if the projection tube is imploded, the projection tube mounting member can cover and prevent the glass fragments from scattering.

[Brief description of drawings]

FIG. 1 is a perspective view showing an attachment structure for a projection tube according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a projection tube mounting structure according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of the second embodiment.

FIG. 4 is an exploded perspective view showing an entire projection unit of Example 2.

FIG. 5 is a perspective view showing a modified example of the second embodiment.

FIG. 6 is a perspective view showing a projection tube mounting structure according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of a main part of the third embodiment.

FIG. 8 is a perspective view showing a modified example of the third embodiment.

FIG. 9 is a perspective view showing a projection tube mounting structure according to a fourth embodiment of the present invention.

FIG. 10 is a cross-sectional view of essential parts showing a mounting structure for a projection tube in Embodiment 5 of the present invention.

FIG. 11 is a sectional view showing a modification of the fifth embodiment.

FIG. 12 is a cross-sectional view of essential parts showing a modification example applicable to Examples 3, 4, and 5 of the present invention.

FIG. 13 is a cross-sectional view of essential parts showing a conventional projection tube mounting structure.

FIG. 14 is an exploded perspective view of a conventional projection unit.

FIG. 15 is a cross-sectional view of essential parts showing another conventional projection tube mounting structure.

[Explanation of symbols]

 1 Cabinet 1a Mounting Boss 21 Projection Tube 21a Panel Section 21b Funnel Section 21c Neck Section 21d Support Section 22 Spacer Block 22b Wall Section 22f Projection Tube Installation Surface 22h Opening 22p Screw Hole Section 23 Holding Plate 23a Flat Section 28 Projection Lens 32 Cooling Refrigerant Liquid 36 Deflection yoke 39 Anode cap 41 Projection tube band 41a Mounting portion 42 Rubber sheet 44 Fixing block 44a Tapered portion 44b Mounting hole 44c Notch portion 44d Outer side wall 45 Leaf spring 83 Projection unit

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[Procedure amendment]

[Submission date] January 24, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008] In the case of fixedly bonded projection tube and spacer blocks, service costs must be replaced spacer blocks simultaneously when replacing the projection tube increases Q
In addition, there is a problem that it takes a long time to cure the adhesive and it is difficult to attach air in a watertight state by entraining air at the time of bonding.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Further, since the projection tube and the spacer block are not adhered to each other, it does not take time to mount the projection tube .
The projection tube can be easily replaced.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

The projection tube mounting structure according to the first embodiment has a funnel portion 2 near the panel portion 21a of the projection tube 21.
Since the outer peripheral curved surface of 1b can be attached to the cabinet 1 by pressing it, the projection tube 21 is unnecessary.
Can be formed with a uniform thickness , and the projection tube can be easily attached.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

Further, does not take installation time since installation of the projection tube 21 is not bonded, also the exchange of projection tube 21 is easily performed.

Claims (5)

[Claims] 1. A projection tube of a glass bulb comprising a neck part to which an electron gun is attached, a panel part having an image display surface, and a funnel part connecting them by a curved surface. A projection tube mounting structure characterized in that a curved surface near the panel section is crimped and fixed to a projection tube mounting section by a contact member. 2. An image of a projection tube of a glass bulb, which is composed of a neck portion to which an electron gun is attached, a panel portion having an image display surface, and a funnel portion connecting them by a curved surface, is used by using a projection lens. In a projection device of a projector for enlarging and projecting on a screen with a projection tube, a curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube is crimped and fixed to a spacer block by a flexible contact member. Construction. 3. An image of a projection tube of a glass bulb, which comprises a neck part to which an electron gun is attached, a panel part having an image display surface, and a funnel part connecting them with a curved surface, using a projection lens. In a projection device of a projector for enlarging and projecting on a screen by a plurality of abutting members made of a rigid body, a spacer block is formed on the curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube or the curved surface from the funnel portion to the panel portion. A projection tube mounting structure characterized by being crimped and fixed to. 4. An image of a projection tube of a glass bulb, which comprises a neck part to which an electron gun is attached, a panel part having an image display surface, and a funnel part connecting them with a curved surface is used by using a projection lens. In a projection device of a projector for enlarging and projecting on a screen, a curved surface near the panel portion on the outer periphery of the funnel portion of the projection tube is crimped and fixed to a spacer block by a frame-shaped rigid block that almost covers the panel portion. The structure for mounting the projection tube. 5. An image of a projection tube of a glass bulb, which is composed of a neck part to which an electron gun is attached, a panel part having an image display surface, and a funnel part connecting them with a curved surface is used by using a projection lens. In a projection device for a projector that magnifies and projects on a screen, a wedge-shaped block is abutted between the curved surface near the panel on the outer periphery of the funnel part of the projection tube and the wall of the spacer block to which the projection tube is attached, and the projection is performed. A projection tube mounting structure characterized in that the tube is fixed to a spacer block.