JP3261867B2 - Projection unit for projector - Google Patents

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 projection apparatus for projecting an image of a projector using a projection tube.

[0002]

2. Description of the Related Art FIG. 12 is a cross-sectional view of a projector of a conventional projector disclosed in, for example, Japanese Utility Model Publication No. 2-41979, and FIG. 13 is an exploded perspective view thereof. In the figure, 21
Is a projection tube such as a cathode ray tube, and 22 is a spacer frame made of a material having good heat conductivity such as aluminum die casting.
A boss 22c having a screw hole 22d is provided on the side of the spacer frame to which the projection tube 21 is attached. Reference numeral 23 denotes a holding plate having a contact hole 23a for contacting the outer wall 21b of the projection tube 21, and mounting holes 23b at four corners.
Is provided. In order to press the holding plate 23 uniformly, a post 24 having one end abutting on the boss portion 22c of the spacer frame through the mounting hole 23b of the holding plate, and a spring 25 on the outer periphery of the post 24 having one end abutting the holding plate 23. Installed in Further, the screw 27 inserted through the washer 26 is passed through the post 24 so that the boss 22
c, the projection tube 21 is pressed by the pressing force of the spring 25 to the spacer frame 22d.
Attach to 36 is a deflection yoke, 37 is a focus magnet, and 38 is a CRT substrate, all of which are attached to the projection tube 21.

On the other hand, a barrel 28a of a projection lens 28 is provided with a screw 3 on the opposite side of the spacer frame 22 from the projection tube side.
5 is attached. At this time, between the face surface 21f of the projection tube 21 and the projection tube installation surface 22f of the spacer frame 22, and between the lens surface 28b of the projection lens 28 and the lens installation surface 22g of the spacer frame 22. Are respectively provided with a projection tube packing 29 and a lens packing 30, and a projection tube 21 and a projection lens 28 are provided.
The space 31 surrounded by the spacer frame 22 is kept watertight.

A cooling refrigerant liquid 32 such as ethylene glycol prevents the light emitted from the projection tube 21 from returning to the phosphor screen to prevent the contrast of the projected image from deteriorating. Face surface 21f
Is transmitted to the spacer frame 22 via the cooling refrigerant liquid 32, and is radiated to the outside from the spacer frame 22. Reference numeral 33 denotes a tank for storing the expanded amount when the cooling refrigerant liquid 32 thermally expands.

Next, the operation will be described. The projector is a device that creates a large screen by enlarging and projecting an electric image of the projection tube by a projection lens, and transfers heat of the face surface 21 f of the projection tube 21, which is extremely high in temperature, to the heat conduction through the cooling refrigerant liquid 32. Good aluminum spacer frame 2
Heat is radiated from 2. Therefore, it is important to prevent the cooling refrigerant liquid 32 from leaking.
In a state where the lens 9 and the lens packing 30 are installed at predetermined positions, the projection tube 21 and the projection lens 28 must be securely pressed against the installation surfaces 22f and 22g of the spacer frame 22.

The cooling refrigerant liquid 32 is made of a material having a refractive index equivalent to that of glass such as ethylene glycol or silicon. Therefore, in addition to the heat radiation function, the cooling refrigerant liquid 32 enters the projection lens 28 without refracting the light of the projection tube 21 To prevent the contrast from deteriorating.

In a normal projector, as shown in a projection principle diagram of FIG . 14, a projection unit 83 composed of a projection tube 21, a projection lens 28, and a spacer frame 22 is used to increase the brightness of the projection device, so that the projection unit 83 is red and green. And those used as three units of blue are widely known. In such a projector, the projection axes of the projection units 83x to 83x are inclined with respect to each other so that the images from the projection tubes 21x to 21z coincide at a certain point on the screen 99. In the projection units 83x and 83z, the relative angle and distance between the projection tube and the projection lens are changed in order to adjust the peripheral focus.

In this type of projector, since the concentration angle θ1 and the launch angle (not shown) change with the change of the projection system such as the screen size, projection distance or projection attitude, each projection tube 21x It is necessary to adjust the focus at the center and the periphery of the screen by changing the concentration correction angle θ2, which is the horizontal tilt angle of 〜z, and the vertical tilt angle (not shown).

FIG. 15 is a sectional view showing a projection unit of another conventional projector disclosed in Japanese Utility Model Laid-Open Publication No. 2-143888. In the figure, the projection tube 21
Is attached to the projection tube frame 51 by an adhesive 41, and the projection lens 28 is attached to the lens frame 53 via the lens packing 30. On the other hand, the inner surface 53n of the lens frame 53 and the sliding packing 50 mounted on the outer groove 51z of the outer surface 51g of the projection tube frame 51 are attached so as to maintain a water-tight state, and the cooling refrigerant liquid 32 is contained therein. Is filled.

[0010] Projection tube frame 51 and lens frame 53
The following describes how to mount the camera and determine the attitude of both frames. That is, the fastening bolt 49 penetrates the hole 51h provided in the flange 51f of the projection tube frame 51, and the spacers 48a, 4
8b is also passed through and screwed into a screw portion 53j provided on the flange portion 53f of the lens frame 53 to connect the two frames to a predetermined posture.

[0011]

In a conventional projector, one projection device is constituted by three projection units, three types of spacer frames are required, and models having different projection distances and screen sizes have been developed. In such a case, it is necessary to recreate a new spacer frame, and there is a drawback that the design time and the die manufacturing cost are increased. Further, the mounting posture of the projection tube with respect to the projection lens is determined by the processing accuracy of the spacer frame, and has a problem that there is no means for correcting even if an assembly error occurs.

[0012] In addition, the real No. shown in FIG. 15 2-1438
In the projection unit described in JP-B-84, in order to change the spacer 48 that determines the attitude of the projection tube and the projection lens, it is necessary to remove a fastening bolt and re-install the projection unit from outside the projection unit. No changes were made when three units were installed. Therefore, when the projection tube and the projection lens are changed in posture according to the change in the projection posture and the screen size, the projection unit is taken out of the apparatus each time. Furthermore, workability MUST insert a spacer in a narrow space for fastening by the fixing screw through the spacer has a gutter cormorants problems worse.

Further, when changing the attitude of the projection tube and the projection lens, the sliding packing is firmly adhered to ensure watertightness of both frames, and a force is required to open and close both frames. There is also a problem that the workability is poor because the user grips and opens and closes.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can easily and arbitrarily set an arbitrary angle and distance even when the attitude of the projection tube and the projection lens is changed in the apparatus. It is an object of the present invention to obtain a projection unit of a projector having a structure that can be changed to a different configuration.

[0015]

According to a first aspect of the present invention, there is provided a projection unit for a projector, wherein both frames are fastened.
Means and a fulcrum on one of the frames,
Opposite side to the working part that contacts the other frame that was not provided
And a projection tube frame
Spacer rotatably provided between lens frame
And loosening the fastening means so that the two frames
The projection tube is made movable by rotating the link member.
Increase the distance between the frame and the lens frame.
Rotate the spacer between the frames to set
The hexagonal prism faces with a gap and inclination
Abutting on the frame, and set the mounting angle of the two frames.
And fixing the two frames by tightening the fastening means .

According to a second aspect of the present invention, there is provided a projection unit for a projector, comprising:
Slidably engage with the pin set on the other frame
Then, loosen the fastening means and attach the two frames
When changing the angle, rotate the link member to
Open the gap between the tube tube and the lens frame,
Rotate the spacer between the two frames to set
The hexagonal prism surface with the interval and inclination
After setting the mounting angle of
Rotate in the opposite direction until the flange of the frame
Tighten the fastening means while in contact with the pacer
Thus, the two frames are fixed.

[0017]

The projection unit of the projector according to the first aspect of the present invention has a structure in which the block holding the projection tube and the block holding the projection lens are movable while maintaining the watertight state. The posture is changed by changing the thickness of the spacer formed of a polyhedron which is a member for determining the posture. At this time, even if the sliding packing for securing the water tightness of both frames is firmly adhered to the frames, one frame has a fulcrum separately from the fastening member for fixing the two frames, and the other frame has The distance between the two frames can be forcibly changed by a link member that comes into contact with the frame or a detaching member such as a screw or a pin.

In the projection unit of the projector according to a second aspect of the present invention, the block for holding the projection tube and the block for holding the projection lens are movable while maintaining a watertight state. space the thickness of the spacer formed by a polyhedron comprising a member for determining the position
Change the posture of both frames by rotating the sensor . At this time, even if the sliding packing for ensuring the watertightness of both frames is firmly adhered to the frames, apart from the fastening member for fixing the two frames , one frame has a fulcrum and the other has a fulcrum. By providing a link member that slidably engages the pins erected on the frames, both the frames can be forcibly opened and closed with a small force.

[0019]

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view showing a projection unit of a projector according to a first embodiment of the present invention, FIG. 2 is a transverse sectional view thereof, FIG. 3 is an exploded perspective view of the projection unit, and FIG. 4 shows an assembled state of the projection unit. FIG. 5 is a cross-sectional view of a main part of a state in which three projection units are installed in the projector apparatus as viewed from above, and FIG. 6 is a cross-sectional view of the projector in a side view. In the figure, the same parts as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

The projection tube frame 51 has an opening 51v through which the projection light passes.
The projection tube packing 29 is attached to an annular groove 51m provided at the opening edge of the projection tube side. The projection tube 21 is installed in contact with the projection tube packing 29, and the projection tube 21 and the projection tube frame 51 are attached in a watertight state by pressing the holding plate 23 with the force of the spring 25 in the same manner as in the prior art, and the projection tube block. 81.

On the other hand, the projection lens 28 is configured by holding a plurality of lens groups by a lens barrel 28a, and a lens surface 28b closest to the projection tube 21 is a lens frame 53.
The flange portion 28f of the lens barrel 28a is fastened with the screw 35 so as to be in a watertight state by contacting the lens packing 30 mounted in the annular groove 53m provided at the opening edge of the opening portion 53v. Block 82 is constituted.

An opening 51v of the projection tube frame 51 is provided.
The outer surface 53g of the opening 53v of the lens frame 53 is inserted into the inner surface 51n at a predetermined interval.
A sliding packing 50 such as an O-ring is mounted as a sealing member in a groove 53z provided in an outer circumferential direction of an outer surface 53g of the lens frame 53, and an inner surface 51n of the projection tube frame 53 and an outer surface of the lens frame 53 are provided. 53g is movably connected with a watertight state.

In this manner, the projection tube 21, the projection lens 28, the projection tube frame 51, and the lens frame 53
Is filled with a cooling refrigerant liquid 32 through an injection port 51 d provided in the projection tube frame 51. 74
Is an inlet screw which is screwed through the inlet packing 75, and serves as a lid for preventing the cooling refrigerant liquid 32 from flowing out.

The cooling refrigerant liquid 32 is made of, for example, ethylene glycol or silicon oil, and transfers the heat generated from the face 21f of the projection tube 21 during operation to the projection tube frame 51 and the lens frame 53 to radiate heat to the outside. In addition to the role, since the refractive index is the same as that of the glass which is the material of the projection tube 21 and the projection lens 28, the light from the projection tube 21 is incident on the projection lens 28 without being refracted, and the light is projected on the fluorescent screen. It also prevents return and prevents contrast degradation.

A diaphragm 71 fixed by a cover 72 absorbs a volume change due to expansion and contraction of the cooling liquid 32 during operation and non-operation by expansion and contraction of the diaphragm 71 to keep the pressure in the space 31 constant. To keep it. This diaphragm 71 is also provided with a convex portion 71 provided around it.
By a, it is attached to the projection tube frame 51 in a watertight state.

In order to connect the projection tube 21 and the projection lens 28 in a predetermined posture, the flange 5 of the projection frame 51
It is fastened by fastening bolts 49 with a spacer 48 in which a hexagonal column 48a is vertically inserted by a shaft 48b between 1f and the flange portion 53f of the lens frame 53. The hexagonal columns 48a of the spacer 48 are formed so that the distances and inclinations of the surfaces facing each other are different from each other. Therefore, by selecting a predetermined combination of surfaces, the distance and inclination of the projection tube 21 with respect to the projection lens 28 can be adjusted as designed. Can be set to

In order to place the spacer 48 at a predetermined position between the two frames, a pin portion 51a is provided in parallel with the projection tube frame 51, and a shaft 48b of the spacer 48 is provided between the pin portions 51a. Is to be attached.

Reference numeral 49 denotes a frame connecting fastening bolt installed at a predetermined position, which penetrates a through hole 53k provided in a flange 53f of the lens frame 53, and is screwed to a screw portion 51j of the projection tube frame 51. ing. The fastening bolt 49 receives the projection tube frame 51 and the lens frame 5 from the flange 53f on the projection tube side of the lens frame 53.
The step portion 49d is formed with a distance longer than the distance that the step 3 moves by adjustment, and the nut 43 as a detaching member is abutted on the step portion 49d and screwed.

Next, the operation will be described. As shown in FIG. 5, a normal projector has a projection tube 2 for high brightness.
1. The projection unit 83 composed of the projection lens 28, the projection tube frame 51, and the lens frame 53 is
Those used as three units of green and blue are widely known. In such a projector, the projection units 83x, 83x, 21x, 21z, 21z are so arranged that the images from the projection tubes 21x, 21y, 21z coincide at a certain point on the screen 99.
The projection axes Px and Pz of the projection unit 83z are inclined by the concentration angle θ1 with respect to the projection axis Py of the projection unit 83y. Further, the projection units 83x and 83z on both sides are configured so that the tube axes Kx and Kz of the projection tube 21 are inclined by the concentration correction angle θ2 with respect to the projection axes Px and Pz in order to adjust the peripheral focus. 95 is a projection unit 83
Is a unit base attached with screws 96, and 9
Reference numeral 7 denotes an exterior of the projector 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 θ described above change.
2. Launch angle β, which is the vertical projection angle shown in FIG.
1. It is necessary to adjust the focus at the center and the periphery of the screen 99 by changing the launch correction angle β2. The attitude of the projection tube 21 with respect to the projection lens 28 is changed by the following method.

That is, the fastening bolt 49 for fastening the projection tube frame 51 and the lens frame 53 is loosened to make both frames movable. In this state of starting loosening, the sliding packing 50 does not move because the sliding packing 50 is firmly attached to the inner surface 51n of the projection tube frame 51 and the groove 53z of the lens frame 53. Eventually, the nut 43 as a detaching member screwed into the fastening bolt 49 comes into contact with the flange portion 53f of the lens frame 53, and when the nut 43 is further rotated, the nut 43 is pulled by the nut 43 to increase the interval between the two frames. come. After the two frames are separated to a predetermined interval, the spacer 48 is rotated to set the hexagonal prism 48a having the interval and inclination set at the set intervals and inclinations while the abutting surfaces of the hexagonal columns 48a are in contact with the flange portions 51f and 53f of the both frames.
When the frame 9 is tightened, the frame is restricted by the spacer interposed in the direction in which the frame is closed, and the screw portion 49j of the fastening bolt 49 is restricted in the direction in which the frame is opened, so that both frames can be fixed in a predetermined posture.

FIG. 7 is a sectional view showing a modification of the first embodiment, and FIG. 8 is a perspective view of a main part thereof. In the figure, fastening bolt 4
9 uses an ordinary screw, and uses an E-ring 45 as a detaching member.
The same effect can be obtained at a low cost even with a structure in which is installed at a predetermined position of the screw.

FIG. 9 is a perspective view showing another method of attaching the projection tube 21 and the projection tube frame 51 to the method described above. In the figure, the projection tube 21 is installed on a projection tube frame 51 via a projection tube packing (not shown) as in the conventional example and the first embodiment.
A different point is a method of fastening the projection tube 21 and the projection tube frame 51, and the method will be described below. The annular portion 39a of the projection tube band 39 was installed on the outer wall 21b of the projection tube 21 with a rubber sheet 40 as a cushioning material interposed therebetween, and was provided at the tips of four legs 39b of the projection band 39. The screw 34 penetrating the hole 39c is screwed into the projection tube frame 51. At this time, the distal end of the leg 39b of the projection tube band 39 and the mounting surface 51t of the projection tube frame 51 do not come into close contact with each other, so that a gap is formed.
b by using the elastic force of b.
Can be attached by pressing it. Even if such a method of attaching the projection tube 21 is used, the same effect can be obtained by using the fastening method of the projection tube frame 51 and the lens frame 53 shown in the first embodiment together.

Embodiment 2 FIG. FIG. 10 is a side view illustrating a projection unit of a projector according to the second embodiment of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted. Also,
Although not shown, the projection tube block 81 is configured such that the projection tube 21 is attached to the projection tube frame 51 in a watertight state.
The structure of the lens block 82 formed by attaching the projection lens 28 to the lens block 53 in a watertight state is the same as that of the first embodiment, and the description is omitted.

Projection tube frame 51 and lens frame 53
In the same manner as in the first embodiment, the spacers 48 are connected by tightening the screws 44 with a spacer 48 having a predetermined thickness therebetween. On the other hand, a link member 57 that rotates about a fulcrum 57a is pivotally supported on the flange 53f of the lens frame 53, and abuts against the flange 51f of the projection tube frame 51 at a position separated downward from the fulcrum 57a. An acting portion 57b is provided, and a force point portion 57c extending upward is provided on the side opposite to the acting portion 57b.

Next, the operation will be described. The projector is composed of three projection units 83. In the projection units 83 on both sides of the projection unit 83, the projection unit 83 is arranged to be inclined by the concentration angle θ1, and the projection axis P and the tube axis K are set to the concentration correction angle θ2.
And the relationship between the launch angle β1 and the launch correction angle β2 is the same as in the prior art. Further, when the screen size or the installation posture changes, the concentration angle θ1, the concentration correction angle θ2, the launch angle β1, and the launch correction angle β
2 needs to be changed, so that the projection tube frame 5
The structure for moving the lens frame 53 while maintaining a watertight state between the lens frame 1 and the lens frame 53 is the same as that of the first embodiment, and a description thereof will be omitted.

Now, when changing the positions of the projection tube 21 and the projection lens 28, the projection tube frame 51 and the lens frame 5
3 are loosened to make both frames movable. However, just by loosening the screws 44, the sliding packing (not shown) is used as in the first embodiment. Both frames do not move because they are tightly attached to the frame. Then, when the force point portion 57c of the link member 57 pivotally supported by the lens frame 53 is tilted in the Z direction, the action portion 57b rotates in the Y direction and pushes the projection tube frame apart. Then, after separating the two frames to a predetermined distance, the surface of the hexagonal column 48a having the interval and the inclination set by rotating the spacer 48 in the same manner as in the first embodiment is brought into contact with the flange portions 51f and 53f of the two frames. Screw 4
Tighten 4 to fix it.

Embodiment 3 FIG. FIG. 11 is a side view showing a projection unit of a projector according to Embodiment 3 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted. Also,
Although not shown, the projection tube block 81 is configured such that the projection tube 21 is attached to the projection tube frame 51 in a watertight state.
The structure of the lens block 82 formed by attaching the projection lens 28 to the lens block 53 in a watertight state is the same as that of the first embodiment, and the description is omitted.

Projection tube frame 51 and lens frame 53
In the same manner as in the first embodiment, the spacers 48 are connected by tightening the screws 44 with a spacer 48 having a predetermined thickness therebetween. On the other hand, a link member 57 that pivots about a fulcrum 57a is pivotally supported on the flange 53f of the lens frame 53. The link member 57 is provided at a position separated downward from the fulcrum 57a at a position below an action portion 57b provided with an elongated hole portion 57d which is slidably fitted to a pin 58 stood on a flange portion 51f of the projection tube frame 51. A force point portion 57c extending upward is provided on the side opposite to the action portion 57b.

Next, the operation will be described. The projector is composed of three projection units 83. In the projection units 83 on both sides of the projection unit 83, the projection unit 83 is arranged to be inclined by the concentration angle θ1, and the projection axis P and the tube axis K are set to the concentration correction angle θ2.
And the relationship between the launch angle β1 and the launch correction angle β2 is the same as in the prior art. Further, when the screen size or the installation posture changes, the concentration angle θ1, the concentration correction angle θ2, the launch angle β1, and the launch correction angle β
2 needs to be changed, so that the projection tube frame 5
The structure for moving the lens frame 53 while maintaining a watertight state between the lens frame 1 and the lens frame 53 is the same as that of the first embodiment, and a description thereof will be omitted.

Now, when changing the positions of the projection tube 21 and the projection lens 28, the projection tube frame 51 and the lens frame 5
3 are loosened to make both frames movable. However, just by loosening the screws 44, the sliding packing (not shown) is used as in the first embodiment. Both frames do not move because they are tightly attached to the frame. Therefore, when the force point portion 57c of the link member 57 pivotally supported by the lens frame 53 is tilted in the Z direction, the action portion 57b rotates in the Y direction, and a force is applied to the pin 58 fitted in the elongated hole 57d, thereby causing the projection tube frame to move. Spread it out. Then, after separating the two frames to a predetermined interval, the spacer 48 is rotated and set to the set interval and the surface of the hexagonal column having the inclination in the same manner as in the first embodiment. Rotating in the direction, both flanges 51
f and 53f are in contact with the spacer 48. In this state, the screws 44 are tightened to fix both frames.

[0042]

As described above, according to the present invention, when the attitude of the projection tube and the projection lens is changed, both frames are connected even if the sliding packing is firmly adhered in order to ensure watertightness of both frames. Use a link mechanism that is different from the fastening member
Itatame easily it is possible to move the frame with a small force in both the open and closed, opened near the center of the frame left and right at the same time, or can closing movement, be prying both full <br/> frame Absent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a projection unit of a projector according to a first embodiment of the invention.

FIG. 2 is a cross-sectional view illustrating a projection unit of the projector according to the first embodiment of the invention.

FIG. 3 is an exploded perspective view showing a projection unit according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing an assembled state of the projection unit according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part showing a state in which three projection units are installed in the projector device, as viewed from above.

FIG. 6 is a cross-sectional view of a projection state of the projector as viewed from a side.

FIG. 7 is a sectional view showing a modification of the first embodiment.

FIG. 8 is a perspective view of a main part of a modification of the first embodiment.

FIG. 9 is a perspective view showing another method of attaching the projection tube. It is sectional drawing.

FIG. 10 illustrates a projector according to a second embodiment of the invention .
It is a side view which shows a projection unit .

FIG. 11 illustrates a projector according to a third embodiment of the invention .
It is a side view which shows a projection unit .

FIG. 12 is a cross-sectional view of a projection device of a conventional projector .

FIG. 13 is an exploded perspective view of a projection device of a conventional projector .
FIG .

FIG. 14 is a principle diagram showing a projection principle of the projector .

FIG. 15 is a sectional view showing a projection unit as another conventional example .
FIG .

[Explanation of symbols]

21 projection tube, 21f face surface, 22 spacer block, 28 projection lens, 29 projection tube packing, 3
0 lens packing, 32 cooling refrigerant liquid, 42 stopper, 43 nut, 45 E-ring, 48 spacer, 48a hexagonal column, 49 fastening bolt, 50 sliding packing, 51 projection tube frame, 51f flange, 5
1n inner surface, 53 lens frame, 53f flange, 53g outer surface, 53z groove, 57 link member, 60 adjusting screw, 61 link A, 62 link B, 63 connecting member, 64 holder, 66 slider, 67 plate member, 69 release pin, 81 projection tube unit, 82 lens unit, 83 projection unit, 84 opening / closing link mechanism, 85 opening / closing unit, 99
screen.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshifumi Ueda 1 Baba Zujo, Nagaokakyo-shi, Mitsubishi Electric Corporation Kyoto Works (72) Inventor Toshitaka Tachibana 1st Baba Zhou, Nagaokakyo-shi Mitsubishi Electric Corporation Kyoto Works ( 56) References JP2-143884 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 31/10

Claims (2)

(57) [Claims] 1. A projector for enlarging and projecting a projection image such as a cathode ray tube on a screen using a projection lens,
The projection tube is separated into a projection tube block which is mounted on the projection tube frame in a watertight state via a packing member, and the projection lens is separated into a lens block which is mounted on the lens frame in a watertight state via a packing member. In the projection unit, a sliding packing member such as an annular O-ring is disposed on an outer peripheral wall of each of the lens frames, and the two frames are movably connected to each other in a watertight state. When, the provided pivot on one of the frame, and re <br/> link member point of pressure on the acting portion and the opposition side abutting the other of the frames not provided supporting point is provided, wherein the projection tube and a spacer rotatably provided between the frame lens frame <br/>, loosen the means for the <br/> concluded freely movable the two frames,
By rotating the link member, the projection tube frame and the
Increase the distance between the lens frames, and insert
Rotate the spacer to adjust the set interval and tilt.
The hexagonal prism faces the flanges of both frames.
Set the mounting angle of both frames,
A projection unit for a projector, wherein the two frames are fixed by tightening means for performing the operation. Wherein engaging the elongated hole provided in the working portion of the link member slidably pins planted in the frame of the other hand, the mounting angle of the two frame by loosening the means for fastening when changing, with the link member by rotating to open the gap between the lens frame and the projection tube frame, rotate the spacer sandwiched between the two frames,
Set the hexagonal prism surface with the set interval and inclination
After the setting direction of the mounting angle of the frame, the link member is rotated in the opposite direction, and the fastening means is tightened in a state where the flange portion of the frame is in contact with the spacer, and the two frames are connected. The projection unit according to claim 1 , wherein the projection unit is fixed.