JPH08331577A - Projection type display device - Google Patents

Abstract

PURPOSE: To provide a projection type display device which can be assembled in a short period with a small number of components and has provision for plural convergence angles. CONSTITUTION: A red projection unit and a blue projection unit are connected respectively to both sides of a green projection unit at a convergence angle θ=0 deg., that is, connected in parallel. A thread turning hole 41 is overlapped onto a screw burring 42 and a screw 10 is screwed from upper and lower holes 43, 93. After a cooling liquid is injected in this state and the red and blue projection units at both side are tilted by using the screw 10 as a turning shaft so as to obtain a prescribed convergence angle θ. The convergence angle θ is set by selecting proper combinations plural thread holes 11 provided on brackets 4R, 4B and plural thread holes 12 provided on X-ray shield plates 9a, 9b through screw fastening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device for enlarging and projecting each image formed by a plurality of image forming means on a screen by a projection lens, and more specifically, mounting for fixing a plurality of projection units. Regarding the mechanism.

[0002]

2. Description of the Related Art FIG. 8 is a schematic plan view showing a conventional color projection display device. Spacers 3 are provided on the three CRTs 1R, 1G and 1B which are image forming means for red, green and blue.
Lenses 2R, 2G, and 2B are connected to each other in a state in which a distance from the image forming surface is maintained by R, 3G, and 3B, and constitute projection units 20R, 20G, and 20B. An injection port 5 is formed on the upper surfaces of the spacers 3R, 3G, and 3B for filling the sealed space between the CRT and the lens with the cooling liquid. The three projection units 20R, 20G, 20B are arranged such that the projection units 20R, 20B at both ends have a predetermined angle (concentration angle) with respect to the projection axis of the central projection unit 20G so that the respective images are focused on the screen S. ) Θ is fixed to the bracket 34 in a horizontal single-row state. The concentration angle θ differs depending on the projection distance and the screen size.

FIG. 9 is an exploded perspective view of the projection type display device shown in FIG. The bracket 34 has a mounting surface integrally formed by bending three small surfaces for each of the projection units 20R, 20G, and 20B, each having an opening of a predetermined shape, at a predetermined angle,
Elongated rectangular side surfaces at both ends of the mounting surface and hexagonal upper and lower surfaces having five sides and one long side corresponding to these surfaces are provided, and a surface facing the mounting surface is open. The lenses 2R, 2G, and
A screw hole for screwing the 2B is formed, and is screwed with the lens 2R, 2G, 2B and the screw 6. Further, similarly, CRTs 1R, 1G, 1B are provided around the opening.
Is formed with screw holes for screwing the spacers 3R, 3G, 3B attached to the spacers 3R, 3G, 3B.
G and 3B are screwed together. A packing is interposed between the CRT and the lens and assembled in a sealed state.
The cooling liquid is injected from the inlet 5 after the assembly is completed, and then the inlet 5 is sealed.

With the bracket 34 shown in FIGS. 8 and 9, only one concentration angle θ can be obtained. Therefore, in order to fix different concentration angles θ to correspond to different screen sizes or projection distances, it is necessary to use three mounting surfaces. Another bracket must be manufactured with different angles formed by the two facets.

Therefore, a projection type display device capable of dealing with a plurality of concentration angles with one member is disclosed in Japanese Utility Model Laid-Open No. 5-48484. FIG. 10 is an exploded perspective view showing this conventional projection display device. The mounting plate 7 has a configuration in which the middle of the long side of a rectangular thick plate is recessed inward, and three sides having the same length are formed, and the angles of the two sides at both ends with respect to the central one side are equal. Such a form is formed on all the two long sides of the upper surface and the two long sides of the lower surface, but the angles are all different. Protrusions are formed in the long-side direction on the two opposing end faces surrounded by the long sides of the upper surface and the long sides of the lower surface, and three side surfaces perpendicular to the upper surface or the lower surface are formed above and below the protruding portions. Has been done. Two screw holes 24 are formed on this side surface. It also has an opening of a predetermined shape,
Two plate pieces 22 each having a through hole 23 are provided upright on the upper surface and the lower surface of a holder 21 for fixing and holding the lens and the lens on both sides thereof.

[0006] A set of three side faces forming a desired angle is selected, and two screw holes 24 formed in each of the three side faces,
Two through holes 23 provided on the lower surface of each of the three holders 21 are screwed with a screw 25, and the holders 21 are fixed one by one to the selected three side surfaces. Similarly, the mounting plate 7 is attached to the upper side of the holder 21 to fix the upper and lower sides of the three holders 21. As a result, the three holders 21 are fixed at the desired concentration angle θ. If such a mounting plate 7 is used, the holder 21 can be fixed at four concentration angles θ.

[0007]

In any of the conventional examples, when the spacer 3 and the lens 2 are screwed to the bracket 34 or when the holder 21 is screwed to the mounting plate 7, they are concentrated at an angle θ. It is necessary to have a receiving jig that holds it according to the above. Further, since the advancing angle of the screw is different depending on the three components for red, green and blue, when the screw is tightened by the screw tightening machine, it is necessary to change the direction of the head portion, which takes time at the time of assembling. To support models with different concentration angles θ, change the receiving jig or change the angle,
Also, since it is necessary to change the angle of the head portion of the screw tightening machine, a loss time occurs due to switching.

The present invention has been made in view of such circumstances, and adjacent projection units are connected by a holding member so as to be rotatable about an axis perpendicular to the juxtaposed plane, and a required concentration angle can be obtained. By being fixed to the fixed plate as obtained,
It is an object of the present invention to provide a projection display device that can be assembled in a short time with a small number of parts and that can cope with a plurality of concentration angles.

[0009]

In a projection type display device according to a first aspect of the invention, each projection unit has an adjacent projection unit,
The projection unit is held by a holding member that is connected so as to be rotatable about an axis perpendicular to the juxtaposed planes, and is rotated about the axis to obtain a predetermined concentration angle. It is characterized by being fixed by a fixing plate at a position.

A projection type display device according to a second aspect of the present invention is the projection type display device according to the first aspect, wherein the holding member and the fixing plate are provided with a plurality of screw holes at appropriate positions facing each other, and a combination of the screw holes is selected. It is characterized in that a required concentration angle can be obtained by screwing.

A projection display device according to a third invention is characterized in that, in the first or second invention, the spacer and the holding member are integrally formed.

The projection type display device according to the fourth invention is
In the second or third aspect of the invention, a mounting portion for mounting a plurality of projection units on a frame body to be incorporated is provided on the outer surface of the projection unit disposed on the outer side.

[0013]

In the first and second aspects of the invention, the holding members of the adjacent projection units are connected so as to be rotatable in the direction in which the concentration angle is changed, and the concentration angle is set by the fixed plate. The holding member and the fixing plate can be shared even in a plurality of models having different screen sizes and projection distances. In addition, when assembling the projection units, multiple projection units are arranged in parallel and then the required convergence angle is changed. Therefore, the jig used when assembling the projection units can also be used for multiple projection units in one model and for multiple models. It is possible to reduce the cost and improve the workability.
When the projection unit is assembled, there is a step of injecting the cooling liquid into the space surrounded by the image forming means, the projection lens and the spacer. However, since this step can be performed in a parallel arrangement state of the projection units, There is no need to switch the inlet position for each model, improving workability.

According to the third aspect of the invention, in addition to the above-described operation, the number of parts can be reduced, and the step of attaching the projection unit to the holding member can be eliminated.

According to the fourth aspect of the invention, in addition to the above-mentioned operation, it is possible to reduce the number of parts for mounting a plurality of projection units having fixed and fixed concentration angles on the frame.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. Example 1. 1 is a partially exploded perspective view showing a first embodiment of a projection display device according to the present invention. CRTs 1R, 1G and 1B, which are image forming means for red, green and blue, are spacers 3.
It is connected to the lenses 2R, 2G, 2B via R, 3G, 3B, and frame-shaped brackets 4R, 4G, 4B are attached to the spacers 3R, 3G, 3B.

FIG. 2 is a sectional view showing the connecting portion between the CRT 1 and the lens 2, which is common to the projection units for red, green and blue. The spacer 3 is in the shape of a frame having a substantially rectangular opening in the center thereof that matches the front shape of the CRT 1. An annular groove is formed in the vicinity of the peripheral edge on one side of this opening.
31 is provided, and an annular packing 51 is fitted in the annular groove 31. The CRT 1 is connected to the spacer 3 while being in contact with the packing 51. An annular groove 32 is also provided near the peripheral edge on the other surface side of the opening.
An annular packing 52 is fitted in the 32. Lens 2
Is connected to the spacer 3 while being in contact with the packing 52.

An injection port 5 for injecting the cooling liquid 8 is formed on the upper surface of the spacer 3 and can be opened and closed by a sealing screw 54 with a packing 53 interposed. Further, on the lower surface of the spacer 3, there is formed a tank 33 for containing the thermally expanded component of the injected cooling liquid 8. The bracket 4 is screwed to the spacer 3 with a screw 14.

Next, the component structure for setting and fixing the concentration angle will be described. Brackets 4R and 4B on both ends
Has screw rotation holes 41 projecting outward at two positions on the upper and lower sides of the surface on the bracket 4G side (inner side), and screw holes 44 are formed at the inner end portions of the upper surface and the lower surface. A plurality of screw holes 11 are provided on the other side of the upper and lower surfaces. The central bracket 4G has a total of four screw burrings 42 vertically formed on two side surfaces facing the brackets 4R and 4B, respectively. When the screw 10 is screwed into the screw bar ring 42, the screw 10 is screwed on both ends of the upper surface and the lower surface.
And a hole 43 through which the tip of the driver is passed is opened,
A screw hole 45 is formed inside each hole 43. FIG. 3 is an enlarged vertical cross-sectional view showing a main part of a connecting portion between the brackets 4R and 4G, showing a state in which the screw 10 is screwed into the screw rotation hole 41 and the screw burring 42.

The three projection units composed of the CRT 1 and the lens 2 are fixed by X-ray shield plates 9a and 9b in the form of an open lid which also serve as fixing plates above and below. The X-ray shields 9a and 9b are symmetrical with respect to the projection unit because the two surfaces of the housing are removed. On the bottom plates of the X-ray shielding plates 9a and 9b, a fixing hole 91 is provided at a position corresponding to the screw hole 45, an arcuate arc hole 92 is provided at a position corresponding to the screw hole 44, and a hole 93 is provided at a position corresponding to the hole 43. But more holes 93
A plurality of concentrated angle setting holes 12 (a total of six in two rows in FIG. 1) are formed at the outer corners of each. The concentration angle setting hole 12 is formed at a position aligned with the screw hole 11 when the projection units on both sides are tilted to obtain a plurality of required concentration angles. The side plate on the CRT1 side of the X-ray shielding plates 9a and 9b has a C
An arcuate recess larger than the diameter of the corresponding position of RT1 is provided.

When assembling the projection type display device having the above-described structure, first, the CRT 1 is attached to the spacer 3, and then the lens 2 is attached. Then, the bracket 4 is attached to the spacer 3 to form the projection unit, and the cooling liquid 8 is enclosed. Perform this process for the projection units for red, green, and blue. Next, the projection unit for green is fixed to the upper and lower X-ray shielding plates 9a and 9b. That is, the two screw holes 45 on the upper surface of the bracket 4G and the two fixing holes 91 of the upper X-ray shielding plate 9a are screwed, and the two screw holes 45 on the lower surface of the bracket 4G and the lower X-ray shielding plate 9b. The two fixing holes 91 and are fixed with screws. Then, a projection unit for red and a projection unit for blue are provided on both sides of the projection unit for green at a convergence angle θ =
Connect at 0 °, ie parallel. This is screw burring
This can be done by stacking the screw rotation hole 41 on 42 and screwing the screw 10 through the upper and lower holes 43 and 93. In this state, the red and blue projection units on both sides are tilted so that the required concentration angle θ can be obtained. At this time, the concentration angle θ is set by selecting an appropriate combination from a plurality of screw holes 11 provided in the brackets 4R and 4G and a plurality of screw holes 12 provided in the X-ray shielding plates 9a and 9b. It can be done by stopping. After the setting of the concentration angle θ is completed, the circular arc hole 92 and the screw hole 44 are screwed and fixed.

As described above, in the present invention, the bracket is divided into three parts, and one set of brackets can handle a plurality of models having different screen sizes or projection distances. Therefore, the number of molds for making the bracket is significantly reduced, and the cost required for this is reduced. Red again
Since the concentration angle is set after the green and blue projection units are assembled, it is not necessary to change the tightening angle even when using a screw tightening machine during assembly, improving workability. To do. Further, since the cooling liquid is also injected with the concentration angle of 0 °, it is not necessary to switch the injection port position of the injection machine for each projection unit, and the loss time is reduced.

Embodiment 2 FIG. FIG. 4 is a partially exploded perspective view showing a second embodiment of the projection display device according to the present invention. In this embodiment, vertically long rectangular mounting portions 13 are integrally formed on the outer side surfaces of the brackets 4R and 4B shown in FIG. One hole at each of the upper and lower ends of the mounting part 13
13a is formed. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted. The mounting part 13
It is used when screwed and fixed to the frame of the projection display device or the support portion (neither is shown) of the projection unit. Since the mounting portions 13 are provided on the brackets 4R and 4B, the number of parts required for this fixing can be reduced.

Example 3. FIG. 5 is a partially exploded perspective view showing a third embodiment of the projection display device according to the present invention. This embodiment uses spacers 3R, 3G, 3B having the functions of the brackets 4R, 4G, 4B shown in FIG. The upper and lower portions of one side surface of the spacers 3R and 3B are recessed in a square shape, and a screw rotation hole 41 is formed so as to protrude outward in the middle thereof. The upper and lower portions of both side surfaces of the spacer 3G are angularly recessed, and a screw burring 42 is formed so as to project outward in the middle thereof. Then, as in the first embodiment, the spacer 3
Screw holes 11 and 44 are formed in the upper and lower surfaces of R and 3B. Screw holes 45 are formed in the upper and lower surfaces of the spacer 3G, but the holes 43 are not formed. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

The connecting portion of the spacers 3R and 3G via the screw turning hole 41 and the screw bar ring 42 is shown in an enlarged scale in FIG. As shown in FIG. 6, a screw burring 42 is superposed on the screw rotation hole 41 and fastened by the screw 10 from above and below,
It is rotatably connected about a screw 10. In the third embodiment, the same effect as that of the first embodiment can be realized with a small number of parts.

Example 4. FIG. 7 is a partially exploded perspective view showing a fourth embodiment of the projection display device according to the present invention. In this embodiment, on the outer side surfaces of the spacers 3R and 3B shown in FIG.
A mounting portion 13 similar to that shown in FIG. 4 is integrally molded. The other configurations are similar to those of the third embodiment, and the same reference numerals are given to omit the description. The mounting portion 13 is used when screwed and fixed to a frame of the projection display device or a support portion (neither is shown) of the projection unit. Therefore, in the configuration of the third embodiment, it is possible to reduce the number of parts of the entire device.

[0027]

As described above, in the projection type display apparatus according to the present invention, the adjacent projection units are connected by the holding member so as to be rotatable about the axis perpendicular to the juxtaposed plane, and the required concentration angle is set. By being fixed to the fixed plate so that
The holding member and the fixing plate can be shared even in a plurality of models having different screen sizes and projection distances.
Therefore, it is not necessary to prepare a holding member for each screen size and projection distance, the cost required for the mold is reduced, and the cost is reduced. In addition, when assembling the projection units, multiple projection units are arranged in parallel and then the required convergence angle is changed. Therefore, the jig used when assembling the projection units can also be used for multiple projection units in one model and for multiple models. The equipment cost can be reduced.
The present invention has an excellent effect that it can be assembled with a smaller number of parts and in a shorter time, and can cope with a plurality of concentration angles.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a first embodiment of a projection display device according to the present invention.

FIG. 2 is a cross-sectional view showing a connecting portion between a CRT and a lens.

FIG. 3 is an enlarged view showing a connecting portion of a bracket.

FIG. 4 is a partially exploded perspective view showing a second embodiment of the projection display device according to the present invention.

FIG. 5 is a partially exploded perspective view showing a third embodiment of the projection display device according to the present invention.

FIG. 6 is an enlarged view showing a connecting portion of the bracket.

FIG. 7 is a partially exploded perspective view showing a fourth embodiment of the projection display device according to the present invention.

FIG. 8 is a schematic plan view showing a conventional color projection display device.

9 is an exploded perspective view of the projection display device shown in FIG.

FIG. 10 is an exploded perspective view showing a conventional projection display device.

[Explanation of symbols]

1R, 1G, 1B CRT, 2R, 2G, 2B lens, 3R, 3G, 3B spacer, 4R, 4G, 4B
Bracket, 9a, 9b X-ray shield, 10 screws, 11, 44,
45 screw holes, 12 concentrated angle setting holes, 13 mounting parts, 41 screw rotation holes, 42 screw burrings, 43, 93 holes, 91 fixing holes, 92 arc holes.

Claims (4)

[Claims] 1. A projection-type display device in which projection units in which image forming means and projection lenses are combined through spacers are arranged side by side at a predetermined concentration angle, hold each projection unit, and adjacent projection units. Is fixed to a holding member that is connected so as to be rotatable about an axis that is perpendicular to the juxtaposed plane and a position that is rotated about the axes so that a predetermined concentration angle is obtained. And a fixing plate for the projection type display device. 2. The holding member and the fixing plate are provided with a plurality of screw holes at appropriate positions facing each other, and a desired concentration angle can be obtained by selecting a combination of the screw holes and screwing. 2. The method according to claim 1, wherein
The projection display device described. 3. The projection display device according to claim 1, wherein the spacer and the holding member are integrally formed. 4. The mounting portion for mounting a plurality of projection units to a frame body to be built in is provided on the outer surface of the projection unit arranged outside. 3. The projection display device according to item 3.