JPH07250337A - Video projector - Google Patents

Abstract

PURPOSE:To attain excellent stability of a projector and to prevent a deviation in the optical axis due to weight (moment) of a projection lens even when a projection lens with a long focal distance is employed for large magnification. CONSTITUTION:A main body section 1 incorporating a CRT and projection lenses 4B, 4G, 4R with a long focal distance are supported independently to a frame 23 and their optical axes are matched and also supported to a base 16 via the frame 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector device for enlarging an image formed on the tube surface of a cathode ray tube by a projection lens and projecting it on a projection surface such as a screen.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube (CRT) is provided, and an image formed on the tube surface (CRT panel phosphor screen) of this cathode ray tube is enlarged by a projection lens and projected on a projection surface such as a screen. A video projector device configured as described above has been proposed. Such a video projector device is configured so that the distance between the cathode ray tube and the screen, that is, the projection distance is at most about several meters or less in use conditions.

However, in recent years, there has been a need for a video projector device used for projection such that the projection distance exceeds 10 m and the projection screen size exceeds 100 inches, such as when projecting on a dome of a planetarium. Is becoming. In such a video projector apparatus, since a projection lens having a large lateral magnification and a long focal length is used, the distance between this projection lens and the tube surface of the cathode ray tube becomes extremely long.

[0004]

By the way, in the conventional video projector apparatus, in order to use the above-mentioned projection lens having a long focal length, as shown in FIG. The projection lens will be fixed to. That is, in this video projector device, the cathode ray tube 204 is attached to and supported by the chassis 211 via the CRT bracket 205. Then, the projection lens 20
7 is a support cylinder 21 for the CRT bracket 205.
It will be attached via 3. The support cylinder 213
Is fixed to the CRT bracket 205 at the base end side by a plurality of setscrews 216. This support tube 2
A helicoid female screw 214 is formed on the inner surface portion of the tip side of 13. The projection lens 207 has a helicoid male screw 215 on the outer peripheral surface of the lens barrel, and is supported by the support barrel 213 by screwing the helicoid male screw 215 into the helicoid female screw 214.

When the projection lens 207 having a long focal length is attached to the conventional video projector apparatus in this manner, the moment due to the weight of the projection lens 207 is directly applied to the CRT bracket 205 to cause the CR.
There is concern about plastic deformation of the T bracket 205 or the chassis 211. That is, in this video projector apparatus, the center of gravity g and C of the projection lens 207 are
Since the distance from the RT bracket 205 is large, a large moment M is generated in the CRT bracket 20.
5 to the entire chassis 211.

As a result, there is a risk that distortion will adversely affect the optical system in the CRT bracket 205 and the chassis 211, and the CRT bracket 205 and the chassis 2 will be affected.
It is necessary to make 11 sufficiently rigid. Also,
Since the center of gravity of the entire video projector device shifts to the front side due to the weight of the lens, the stability of the video projector device is likely to be lost.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and even when a projection lens having a long focal length is used to realize a long projection distance, the projection lens It is an object of the present invention to provide a video projector device in which a chassis or the like is prevented from being deformed by a moment due to weight, a good projected image can be obtained, and stability of the entire device is not impaired. To do.

[0008]

In order to solve the above problems and achieve the above objects, a video projector apparatus according to the present invention includes a main body having a plurality of cathode ray tubes built therein, and a mount for supporting the main body. And a lens bracket attached to the mount for supporting a plurality of projection lenses corresponding to the cathode ray tubes, wherein the lens bracket includes the projection lenses and the axes of the cathode ray tubes to which the optical axes of the projection lenses correspond. The position is the one that corresponds to and is supported.

Further, according to the present invention, in the above-mentioned video projector device, the mount is supported on a base so as to be capable of tilt adjustment via a support shaft.

Further, according to the present invention, in the video projector device, the support shaft is provided at the front side of the main body, which is the projection lens side.

According to the present invention, in each of the above video projector devices, an angle adjusting mechanism is provided between the gantry and the base, and the angle adjusting mechanism is provided on the base. It is configured to include an advancing / retreating member that is operated to move back and forth toward the frame, and a connecting member that connects the advancing / retreating member and the frame via two universal joint portions.

Further, according to the present invention, in each of the above-mentioned video projector devices, three or more leg portions that are adjustable in expansion and contraction downwardly from the base are disposed, and these leg portions are pivoted on the lower end side. The foot is attached via a joint.

[0013]

In the video projector apparatus according to the present invention, the lens bracket which is attached to the pedestal supporting the main body containing the plurality of cathode ray tubes and which supports the plurality of projection lenses corresponding to the respective cathode ray tubes includes Since the lenses are supported in such a position that the optical axes of these projection lenses coincide with the axes of the corresponding cathode ray tubes, it is possible to form a good projection image even when the projection distance is sufficiently long.

Further, in the above-mentioned video projector device, when the gantry is supported on the base so as to be capable of tilt adjustment via a support shaft, the support shaft is supported around the support shaft.
The elevation angle (angle of dip) of the mount can be easily adjusted.

Further, in the above-mentioned video projector device, when the support shaft is provided at the front side which is the projection lens side of the main body portion,
The movement of the projection lens is reduced when adjusting the inclination around the spindle.

In each of the above video projector devices, an angle adjusting mechanism is provided between the mount and the base, and the angle adjusting mechanism is provided on the base and faces the mount. When the advancing / retreating member is operated and the advancing / retreating member is composed of a connecting member for connecting the advancing / retreating member and the pedestal through two universal joint portions, the inclination of the pedestal can be accurately adjusted. Can be done delicately.

Further, in each of the above-mentioned video projector devices, three or more leg portions that are adjustable in expansion and contraction are arranged downward from the base, and the legs are connected to the lower end sides of the leg portions through pivot joints. If the base is attached, even if the base is installed on an inclined surface, the base is easy to
In addition, it can be reliably held in the horizontal state.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The video projector device according to the present invention is used when the projection distance exceeds 10 m and the size of the projected image (diagonal length) exceeds 100 inches, as in the case of projecting a video image on the dome of the planetarium. It is suitable.

As shown in FIGS. 1 and 2, this video projector device includes three cathode ray tubes (CRT) 27B,
27G and 27R are built-in and the main-body part 1 is comprised and comprised. The above three cathode ray tubes 27B, 27G, 27
The Rs are arranged in the outer casing of the main body 1 with their tube surfaces facing forward and their axes substantially horizontal, and are arranged in parallel with each other in the lateral direction. The outer casing is composed of a base portion 8, a cover portion 7 that covers the upper portion of the base portion 8 and has left and right side wall portions and a rear wall portion, and a front panel portion 9 that closes the front side. There is. The three cathode ray tubes 27B, 27G and 27R are mounted on the base portion 8 on the CRT brackets 28B, 28B and 2R, respectively.
It is supported via 8R.

Each of the cathode ray tubes 27B, 27G, 27R
Respectively form a blue component (B) image, a green component (G) image, and a red component (R) image of the original image. When the images formed by these cathode ray tubes are overlapped and combined, the original image is reproduced. These cathode ray tubes 27B, 27G, and 27R are provided with three emission holes 5B, 5G, which are formed in the front panel portion 9 so as to be laterally arranged.
The pipe surface is exposed to the outside on the front side through 5R. Between the tube surfaces of these cathode ray tubes 27B, 27G, 27R and the emission holes 5B, 5G, 5R corresponding to these tube surfaces, stray light blocking sleeves 29B, 29G, 2 are respectively provided.
9R is provided. These stray light blocking sleeves 29
B, 29G, and 29R are formed in a tubular shape, and the front end portion is brought into contact with the peripheral edge side portion of each of the injection holes 5B, 5G, and 5R, and the rear end portion thereof is each of the CRT brackets 28B, 28G, and 28R.
Corresponding to the cathode ray tube 27 and the rear end of the cathode ray tube 27.
It is located around the tube surface of B, 27G, and 27R.

Then, this video projector device is
It has three projection lenses 4B, 4G, 4R having a long focal length. These projection lenses 4B, 4G and 4R are constructed by incorporating lenses 109B, 109G and 109R in a lens barrel. A helicoid male screw portion 11 for mounting and focusing is formed on the outer peripheral surface portion on the rear end side of the lens barrel. These projection lenses 4B, 4G, 4R have a focal length of a sufficient length so that an image formed on the tube surface of each of the cathode ray tubes 27B, 27G, 27R can be projected in a sufficiently large size. Is configured.

The video projector device is
A pedestal 23 that supports the main body 1 and the projection lenses 4B, 4G, and 4R, and a pedestal 16 that supports the pedestal 23.
It has a fixed base 2 consisting of.

The base 16 is made of a robust material such as metal and has a frame-like shape as shown in FIGS. The base 16 has a reinforcing beam 21 in the lateral direction in the central portion and is formed so as to firmly hold the frame shape. The base 16 has leg portions 17 directed downwards at four corners and a total of six positions at the right and left substantially central positions. As shown in FIGS. 19 and 20, the leg portions 17 are attached to the cylindrical base portion joined to the base 16 by means such as welding, and the tip side of the base portion, that is, the lower end side, respectively. And a nut-like rod portion 44 screwed into a screw hole 107 of the nut 106. That is, the rod portion 44 can be moved forward and backward with respect to the base portion of the leg portion 17 by rotating the rod portion 44, and the expansion and contraction of the leg portion 17 can be adjusted.

Then, on the lower end side of the rod portion 44,
The foot 18 is attached via a pivot joint 108. This base 16 has an inclined installation surface 201.
When installed on top, as shown in FIGS. 21 and 22, the leg portions 17 are expanded and contracted to maintain a horizontal state. That is, as shown by the arrow α in FIG. 21, when the installation surface 201 is inclined in the left-right direction by the angle α, the lengths of the leg portions 17 are made different between the left and right, It is possible to prevent the base 16 from tilting in the left-right direction. Further, as shown by an arrow β in FIG. 22, when the installation surface 201 is inclined in the front-rear direction by an angle β, the lengths of the respective leg portions 17 are made different in the front-rear direction. It is possible to prevent the base 16 from tilting in the front-rear direction.

It should be noted that, as shown in FIG. 23, the base 16 has a structure in which even when the installation surface 201 is a horizontal surface,
By adjusting the length of each leg 17 to expand and contract, as shown in FIG.
3 As indicated by the middle arrow δ, it can be inclined by an arbitrary angle δ. When the base 16 is installed at an angle that is not parallel to the installation surface 210, the foot portion 18 is attached to the rod portion 44 via the pivot joint 108, as shown in FIG. It is tilted and made to follow the installation surface 201.

The mount 23 supports the projection lenses 4B, 4G, 4R with their optical axes parallel to each other, and supports the cathode ray tubes 27B, 27 on the optical axes.
The projection lenses 4B, 4G, 4R and the main body 1 are supported so that the center of the tube surface of G, 27R is located. The pedestal 23 is formed of a sturdy material such as metal into a frame shape, and has a front portion and a central portion,
The lateral reinforcing beams 33 and 34 are provided to firmly maintain the frame shape. The pedestal 23 includes a front portion of the front reinforcing beam 33 to which the lens bracket 3 supporting the projection lenses 4B, 4G, and 4R is attached, and a front portion on which the main body 1 is placed. A portion on the rear side of the reinforcing beam 33 is formed by bending at a predetermined angle θ shown by an arrow θ in FIG.

The lens bracket 3 is formed in a flat plate shape and has three through holes 56 corresponding to the injection holes 5B, 5G, 5R of the main body 1. The lens bracket 3 extends laterally on the front side portion of the pedestal 23 and is fixed perpendicularly to the pedestal 23. As shown in FIGS. 1 to 5, the lens bracket 3 has a plurality of front and rear L-shaped channel members 12 and 13 fixed to the pedestal 23 by a plurality of bolts 14 so that the lower edge portion thereof is scissored from the front and the rear. The bolts 15 are fixed to the front and rear L-shaped channel members 12, 13.

As shown in FIG. 4, the front L channel member 12 is fixed to the lens bracket 3 and the bolt insertion hole 43 into which the bolt 14 screwed into the screw hole 38 of the mount 23 is inserted. And a bolt insertion hole 41 through which the bolt 15 for insertion is formed so as to be orthogonal to each other. Further, the rear L channel member 13 has a bolt 14 that is screwed into the screw hole 38 of the pedestal 23.
The bolt insertion long hole 42 through which the bolt is inserted and the screw hole 39 into which the bolt 15 for fixing the lens bracket 3 is screwed are formed so as to be orthogonal to each other. In addition, on the lower edge side portion of the lens bracket 3,
A bolt insertion hole 40 through which the bolt 15 for fixing the lens bracket 3 is inserted is formed.

That is, when the lens bracket 3 is attached to the pedestal 23, first, as shown in FIG. 5, between the front and rear L-shaped channel members 12 and 13 previously fixed on the pedestal 23 by the bolts 14. Then, the lower edge side portion of the lens bracket 3 is inserted. The front L-shaped channel member 12 is previously fixed to the frame 23 by the bolts 14 at a predetermined position. The rear L-shaped channel member 13 has the bolt insertion long hole 42, and the bolt 14 is loosened. After inserting the lens bracket 3 between the L-shaped channel members 12 and 13, the bolt 15 is screwed into the screw hole 3 of the rear L-shaped channel member 13.
9 is screwed in and the bolt 15 is tightened, the rear side L
The mold channel member 13 is called to the lens bracket 3 side and fixes the lens bracket 3. afterwards,
The rear L-shaped channel material 13 is fixed to the pedestal 23 by the bolts 14, and the mounting work is completed. The lens bracket 3 is provided for the convenience of transportation, movement, and distribution of the video projector device.
3 is removable.

The lens bracket 3 has three lens mounts 10B, 1 corresponding to the three through holes 56.
0G and 10R are attached. As shown in FIG. 8, each of the lens mounts 10B, 10G, and 10R is formed to have a substantially annular shape, and surrounds each of the through holes 56 on the front surface of the lens bracket 3. It is put into a state and is attached by the bolt 48. The bolt 48 is screwed into a screw hole 47 provided in the lens bracket 3 to fix the lens mounts 10B, 10G, 10R to the lens bracket 3.

Each of these lens mounts 10B, 10G,
10R has the above-mentioned projection lenses 4B, 4G and 4R on the inner surface.
Helicoid female screw 5 that is screwed into the helicoid male screw 11
0 is formed. The above projection lenses 4B, 4G, 4
R is supported with respect to the lens bracket 3 by screwing the helicoid male screw 11 into the corresponding helicoid female screw 50 of the lens mount 10B, 10G, 10R, and the optical axis direction by rotating the lens bracket 3. The movement adjustment, that is, the focus adjustment is possible. The lens mounts 10B, 10G, 10R include
A fixing screw 49 is provided so as to penetrate from the outer peripheral surface portion to the inner surface portion. The fixing screw 49 is operated to enter the inside so that the lens mounts 10B, 10
Projection lenses 4B, 4G, 4 supported by G, 10R
The rotation of R is prevented, and the once adjusted focus is prevented from being deviated.

Then, in the rear side portion of the mount 23,
The main body 1 is placed on the back side of the lens bracket 3. When the main body 1 is placed at a predetermined position on the frame 23, the cathode ray tubes 27B, 27
G and 27R have their central axes as the corresponding projection lenses 4B and 4B,
Match the optical axes of 4G and 4R. That is, the mount 2
The front side portion and the rear side portion of 3 are bent and formed at an angle θ corresponding to the angle formed by the base portion 8 and the central axes of the cathode ray tubes 27B, 27G, and 27R. Therefore, the central axis of the cathode ray tube 27B that forms the blue component image is aligned with the optical axis of the projection lens 4B for the blue component image. In addition, the cathode ray tube 2 that forms the green component image
The central axis of 7G is aligned with the optical axis of the projection lens 4G for green component images. The center axis of the cathode ray tube 27R forming the red component image is aligned with the optical axis of the projection lens 4R for the red component image. And each projection lens 4
The optical axes of B, 4G and 4R are parallel to each other.

A front positioning piece 24 is attached to the upper surface of the pedestal 23 for abutting the front edge of the base portion 8 to position the base portion 8 in the front-rear direction.
The front positioning piece 24 has a bent piece portion 25, and the bent piece portion 25 is screwed to the upper surface portion of the reinforcing beam 33 on the front side and protrudes upward. Further, a pair of left and right lateral positioning pieces 31 and 31 are screwed to the upper and lower sides of the pedestal 23 at both sides of the central portion thereof. These lateral side positioning pieces 31, 31 are in contact with both side edge portions of the base portion 8 so that the base portion 8
The horizontal positioning of the. The main body 1 is positioned at the predetermined position by the front and side positioning pieces 24, 31, 31. A rubber foot 32 provided on the rear side of the lower surface of the base portion 8 is placed on the rear edge beam portion 30 which forms the rear edge portion of the pedestal 23.

In the lens bracket 3, as shown in FIG. 6, the L-shaped channel members 12 and 13 are fixed in advance on the lower edge side of the lens bracket 3 in advance, and the L bracket is fixed on the pedestal 23. These L-shaped channel members 1 after being positioned at the positions using dowels or pin fittings.
Alternatively, the bolts 2 and 13 may be attached to the pedestal 23 by fixing them to the pedestal 23 with bolts 14 and 14.

Further, the lens bracket 3 may have a foldable structure as shown in FIG. That is, in this case, the lens bracket 3 and the gantry 23 are connected by the hinge 46 at a predetermined position. The lens bracket 3 can be folded so as to be laid down on the pedestal 23 via the hinge 46 during transportation or non-use.
In use, the lens bracket 3 is mounted on the pedestal 2 by means of bolts 14 via an L-shaped channel member 12 which is previously fixed to a lower edge portion of the front surface of the lens bracket 3.
It is fixed at 3. In this way, the lens bracket 3
When the lens bracket 3 is connected to the mount 23 via the hinge 46, it is possible to prevent the lens bracket 3 from being lost during transportation.

The lens mount may have a cam slit 53 for focus adjustment, as shown in FIG. This lens mount 51B, 51G,
51R is formed in a cylindrical shape into which the projection lenses 4B, 4G, 4R can be inserted, and is attached to the front surface of the lens bracket 3 corresponding to the through holes 56. The cam slit 53 is used for the lens mounts 51B, 5
It is formed so as to penetrate the peripheral wall portions of 1G and 51R so as to form a part of a spiral shape. Screws are provided on the outer surface of the lens barrel of the projection lenses 4B, 4G, 4R. This screw is inserted through the cam slit 53. And
A thumbscrew 52 having a pair of pieces 54 is screwed onto this screw. This lens mount 51B, 51G, 5
In 1R, when the thumbscrew 52 is loosened and the thumbscrew 52 is moved along the cam slit 53, the projection lenses 4B, 4G, 4R are moved in the optical axis direction to adjust the focus. To do. Then, when the focus adjustment is completed, the projection lenses 4B, 4G, and 4R are fixed by tightening the thumbscrew 52.

Further, the projection lenses 4B, 4G, 4R
As shown in FIG. 10, without using a lens mount,
A helicoid female screw 55 is formed on the inner surface of each through hole 56 of the lens bracket 3, and the helicoid female screw 55 is screwed into the helicoid male screw 11 so that the lens bracket 3 is supported. You may In this case, the projection lenses 4B, 4G, 4R
Is rotated around the optical axis to be moved and adjusted in the optical axis direction to perform focus adjustment. When the focus adjustment is completed, the nut ring 57 screwed onto the helicoid male screw 11 is tightened to the lens bracket 3 side, whereby the projection lenses 4B, 4G, 4
R is fixed. The nut ring 57 is formed in an annular shape and has a threaded portion 50 similar to the helicoidal female thread 55 on the inner peripheral surface thereof, and is screwed to the helicoidal male thread 11 of the projection lens 4B, 4G, 4R. There is.

As shown in FIG. 11, the mount 23 has support shafts 19 and 1 projecting from the left and right sides of the front portion.
9 and an angle adjusting mechanism 26 having two universal joints located at the rear side, which are connected to the base 16.

As shown in FIGS. 3, 12 and 13, each of the support shafts 19 and 19 has a front reinforcing beam 33 of the mount 23.
Are located in the vicinity of both end portions and project toward both sides. These support shafts 19 and 19 are respectively mounted on the mount 23.
On the other hand, it is fixed by means such as welding. The support shafts 19 and 19 are connected to the body 1 and the projection lenses 4 respectively.
The pedestal 23 is positioned on both sides of the center of gravity of the pedestal 23 in a state of supporting the B, 4G, and 4R.
The support shafts 19 and 19 are located near the front portion of the main body 1, that is, the projection lenses 4B, 4G and 4 described above.
It is located near R.

The pedestal 23 is surrounded by the base 16 and is supported by the base 16. That is, the base 16 has through holes on both sides on the front side, which serve as bearings for supporting the support shafts 19, 19. As shown in FIGS. 12 and 13, each of the support shafts 19 penetrates through a through hole provided in the base 16 from the inside of the base 16 and is supported by the through hole.
E-rings 20 are attached to the tip ends of the support shafts 19 protruding to the outside of the base 16 to prevent the E-rings 20 from falling off from the through holes. In addition, each of the support shafts 19 and 1
In order to reduce the weight of the entire apparatus, it is desirable that the left and right 9 are formed of independent members. However, it is also possible to use both end sides of one continuous shaft penetrating the pedestal 23 as the support shafts 19 and 19, respectively. In this case, the pedestal 23 and the base 16 are at the same time. By being fixed, rigidity and strength can be improved.

The support shaft 19 of the base 16 is
The bearing portion that supports the not shown in FIG.
As shown in FIG. 5, a semicircular cutout portion 63 that is open upward may be used. The support shaft 19 is provided in the cutout portion 63.
To attach the support shaft 19, the support shaft 19 is fitted into the cutout portion 63 from the upper side of the base 16, and the fixing holder 64 is fixed to the base 16 with screws 66, 66.
This fixing holder 64 is formed of an L-shaped angle member, and has a semicircular cutout portion 65 that is opened downward and cooperates with the cutout portion 63 to form a circular through hole.
It is formed so as to be attached to the upper surface portion of the gantry 16.

The angle adjusting mechanism 26 is shown in FIG.
As shown in FIG. 3, an elevating rod portion 73, which serves as an advancing / retreating member that is supported by a lateral member 22 that extends laterally and is attached to a rear side portion of the base 16 and is vertically movable, is provided. is doing. In the central portion of the lateral member 22, there is provided a through hole that penetrates in the vertical direction.
A nut 75 is fixed to the through hole by means such as welding. The elevating rod portion 73 has a bolt portion 74 on the lower end side, and an adjustment knob 45 is attached to the lower end portion. The bolt portion 74 is the nut 7
5 has a threaded portion which is screwed into the nut 5, and is screwed into the nut 75. That is, by rotating the adjustment knob 45, the elevating rod portion 73 is moved up and down in the vertical direction.

The angle adjusting mechanism 26 has a connecting member for connecting the upper end portion of the elevating rod portion 73 and the mount 23 to each other. This connecting member has two pivots 67 and 68 which are two universal joints, and connects the trailing edge beam portion 30 of the pedestal 23 and the upper end portion of the elevating rod portion 73. That is, the first connecting rod portion 69 is attached to the rear edge beam portion 30 so as to hang downward. A second connecting rod portion 70 is attached to the lower end portion of the first connecting rod portion 69 via the first pivot 67. The second connecting rod portion 70 has a nut portion 71 in the central portion thereof, and a portion below the nut portion 71 is a stretchable portion 72 capable of stretchable adjustment. That is, the second rod portion 70 can be stretched and adjusted in advance. Then, the upper end portion of the elevating rod portion 73 is attached to the lower end portion of the second connecting rod portion 70 via the second pivot 68.

In the angle adjusting mechanism 26, when the elevating rod portion 73 is moved up and down by rotating and adjusting the adjusting knob 45, the pedestal 23 is
The rear portion is moved up and down with respect to the base 16 via the connecting member. That is, the pedestal 23 is rotated around the support shafts 19 and 19 by the angle adjusting mechanism 26.

The angle adjusting mechanism may be constructed by using a so-called pantograph mechanism as shown in FIG. The angle adjusting mechanism has a pair of lower links 84, 84 rotatably supported on the base end side of the gantry 16 via a lower shaft portion 85. These lower links 8
A pair of annular members 81, 82 are attached to the tip ends of the members 4, 84 via the rotating portions 83, 83. A thread groove is formed on the inner peripheral surface of each of the annular members 81 and 82. The thread grooves on the inner peripheral surface of each of the annular members 81 and 82 are thread grooves that are spirals in opposite directions. Then, the base end sides of the pair of upper links 78, 78 are attached to the upper end sides of the annular members 81, 82 via the rotating portions 79, 79. These upper links 78,7
The tip ends of 8 are rotatably connected by an upper shaft portion 77. One shaft 86 is inserted through each of the annular members 81, 82. An adjusting knob 89 is attached to one end of the shaft 86, a first screw portion 88 that is screwed into a screw groove of the one annular member 81 is formed on the outer peripheral portion of the one end side portion, and the other end side portion is formed. A second screw portion 87 that is screwed into the screw groove of the other annular member 82 is formed on the outer peripheral portion of. These first and second screw parts 88, 8
Reference numeral 7 is a screw forming spirals in mutually opposite directions.

The portion from the lower shaft portion 85 to the upper shaft portion 77 constitutes the pantograph mechanism. Then, the upper shaft portion 77 serves as an advancing / retreating member. That is, when the shaft 86 is rotated via the adjustment knob 89, the angle formed by the links 84, 84, 78, 78 is changed by varying the distance between the annular members 81, 82. The upper shaft 77 is operated to move back and forth in the vertical direction.

The upper shaft portion 77 is connected to the rear edge beam portion 30 of the pedestal 23 via the connecting member. That is, the first connecting rod portion 69 is attached to the rear edge beam portion 30 so as to hang downward. A second connecting rod portion 76 is attached to a lower end portion of the first connecting rod portion 69 via a first pivot 67. Then, the upper shaft portion 77 is attached to the lower end portion of the second connecting rod portion 76 via the second pivot 68.

In the angle adjusting mechanism 26, the upper shaft 77 is rotated by adjusting the adjusting knob 89.
Is moved up and down in the vertical direction, the pedestal 23 is moved up and down with respect to the base 16 through the connecting member. That is, the pedestal 23 is rotated around the support shafts 19 and 19 by the angle adjusting mechanism 26.

Further, as shown in FIG. 17, the angle adjusting mechanism includes a rotating shaft 9 rotatably supported by the base 16.
The elevating rod 97, which serves as the advancing / retreating member, may be moved up and down by the nut member 96 provided on the No. 4. That is, the rotary shaft 94 is arranged so as to vertically penetrate the rear side portion of the base 16, and the lower end side thereof is supported by the E ring 95. A nut member 96 is attached to the upper end of the rotary shaft 94. The nut member 96 has a female screw portion 98 opened upward.
have. The nut member 96 is fitted with the elevating rod 97, and the elevating rod 97 is fitted to the female screw portion 98.
A male screw portion formed on the outer peripheral surface of the is screwed.

A first bevel gear 90 is attached to the rotary shaft 94. This first bevel gear 9
0 is a second bevel gear 91 attached to one end of an adjustment shaft 92 rotatably supported by the base 16.
Are in mesh. The adjusting shaft 92 is the base 1
A bearing 93 attached to the shaft 6 supports the base 16 so as to be horizontal and rotatably supported around the base 16. At the other end of the adjusting shaft 92, the adjusting knob 8
9 is attached. That is, the adjusting knob 89
When the adjustment shaft 92 is rotated via the rotary shaft 94, the rotary shaft 94 is rotated, the nut member 96 is rotated, and the lift rod 97 is moved up and down in the vertical direction.

The elevating rod 97 is connected to the rear edge beam portion 30 of the frame 23 via the connecting member. That is, the first connecting rod portion 69 is attached to the rear edge beam portion 30 so as to hang downward. A second connecting rod portion 76 is attached to a lower end portion of the first connecting rod portion 69 via a first pivot 67. The elevating rod 97 is attached to the lower end portion of the second connecting rod portion 76 via the second pivot 68.

In the angle adjusting mechanism 26, the elevating rod 9 is rotated by adjusting the adjusting knob 89.
When 7 is moved up and down in the vertical direction, the pedestal 23 is moved up and down with respect to the base 16 at the rear portion via the connecting member. That is, the pedestal 23 is rotated around the support shafts 19 and 19 by the angle adjusting mechanism 26.

Further, the angle adjusting mechanism may be constructed by using a so-called turnbuckle 100 as shown in FIG. This angle adjusting mechanism is used for the lower pivot 10 which is a part of a connecting member for the beam portion 105 of the gantry 16.
It has a lower bolt member 103 supported on the base end side by means of a pin. On the tip side of the lower bolt member 103,
The screw part is formed. The nut portion 1 of the turnbuckle 100 is attached to the thread portion of the lower bolt member 103.
02 is screwed together. And the turnbuckle 10
An upper bolt member 97 serving as an advancing / retreating member is screwed into the other nut portion 101 of 0. Each of these bolt members 1
The screw portions 03 and 97 are screws forming spirals in directions opposite to each other.

The upper bolt member 97 is connected to the rear edge beam portion 30 of the pedestal 23 via the connecting member. That is, the first connecting rod portion 69 is attached to the rear edge beam portion 30 so as to hang downward. A second connecting rod portion 76 is attached to the lower end portion of the first connecting rod portion 69 via the upper pivot 67. The upper bolt member 9 is attached to the lower end of the second connecting rod portion 76.
7 is attached.

In the angle adjusting mechanism 26, when the upper bolt member 97 is moved up and down by rotating and adjusting the turnbuckle 100, the pedestal 23 has its rear side portion on the pedestal 16. The elevator is operated up and down. That is, the pedestal 23 is rotated around the support shafts 19 and 19 by the angle adjusting mechanism 26.

In the main body 1, as shown in FIG. 24, cylindrical stray light is blocked between the tube surfaces of the cathode ray tubes 27B, 27G and 27R and the projection lenses 4B, 4G and 4R. The sleeves 29B, 29G, 29R are provided. Furthermore, these stray light blocking sleeves 29B, 2
In 9G and 29R, as shown in FIG. 27, along the optical path outer peripheral shape between the tube surface of each cathode ray tube 27B, 27G, and 27R to each projection lens 4B, 4G, and 4R, A vertical anti-reflection diaphragm plate 118 is provided in multiple stages, and the stray light blocking sleeves 29B, 29 are provided.
The reflection inside G and 29R is prevented to improve the image quality of the projected image. The stray light blocking sleeves 29B, 29G, 2
The shape of 9R may be a round or square tube as shown in FIG.

The stray light blocking sleeves 29B, 29G,
A plurality of (for example, four) fixing pieces 11 are provided at the rear end of 29R.
0 is projected. The stray light blocking sleeve 29B,
29G, 29R, the plurality of fixing pieces 110, the above C
Front frame portion 111 of RT brackets 28B, 28G, 28R
B, 111G, and 111R are fixed to the screw holes 112 provided in the B, 111G, and 111R by set screws, and are arranged between the CRT brackets 28B, 28G, and 28R and the lens bracket 3. The fixing piece 110 may be directly fixed to the front surface of the coupler of each of the cathode ray tubes 27B, 27G and 27R.

The stray light blocking sleeve shown in FIG.
As shown in, each cathode ray tube 27B, 27G, 27R
And a housing-like member 113 that is open at the front and back to entirely cover the projection lenses 4B, 4G, and 4R, and two sheets that partition the inside of the housing-like member 113 into three spaces 114, 114, and 114. It may be configured with the partition wall. As described above, in the stray light blocking sleeve having the casing-shaped member 113,
At the time of attachment, the fixing pieces 110 at four locations may be fixed.

The stray light blocking sleeves 29B, 29G,
As shown in FIG. 26, an aperture plate 118 provided in 29R connects the raster of the tube surface of each cathode ray tube 27B, 27G, 27R and the outer periphery of the rear surface of each projection lens 4B, 4G, 4R. Each of the cathode-ray tubes 27B, 27 has an opening in the shape of a pyramidal region cut into a circle perpendicular to the optical axis.
A plurality of sheets are arranged between the G and 27R and the respective projection lenses 4B, 4G and 4R.

The diaphragm plate 118 is a rib-shaped thin plate protruding from the inner walls of the stray light blocking sleeves 29B, 29G, 29R perpendicularly to the optical axis. The diaphragm plate 118 is provided with the stray light blocking sleeves 29B, 29G, 2
It can be integrally formed with 9R by injection molding using a synthetic resin (plastic or FRP) or aluminum die casting. The diaphragm plate 118 is formed of sheet metal, paper or the like separately from the stray light blocking sleeves 29B, 29G and 29R.
You may make it attach to 29G and 29R. In addition,
It is desirable that the tip of the diaphragm plate 118 has a blade-like thin pointed shape.

The stray light blocking sleeves 29B, 29 described above
In the G and 29R, the above cathode ray tubes 27B and 27
The light diverging from the raster on the G, 27R tube surface is shown in FIG.
, The stray light blocking sleeves 29B, 29G,
The projection lens 4B, 4G, which reflects on the inner surface of 29R,
It is blocked by the diaphragm plate 118 on the optical path reaching 4R.

The stray light blocking sleeves 29B, 29G and 29R emitted from the cathode ray tubes 27B, 27G and 27R.
29, the lower end of the raster indicated by the arrow b in FIG.
Optical path γ connecting the tips of 8 and sleeves 29B, 2 for blocking stray light
The point of intersection with the inner surface portions of 9G and 29R is point ε. And
The optical path connecting the point ε and the lower end of the rear surface of the projection lenses 4B, 4G, and 4R is θ. Here, the region β in FIG.
Is the diaphragm plate 11 generated by the light rays from the raster.
Equivalent to the shadow of 8. The area α, on the contrary, corresponds to a portion where the light rays from the raster are reflected by the inner surface portions of the stray light blocking sleeves 29B, 29G and 29R, but the reflected light is directly projected by the diaphragm plate 118 on the front side. Lens 4
There is no incidence on B, 4G and 4R. As described above, the diaphragm plate 118 is provided with the stray light blocking sleeves 29B and 2B.
It is effective for forming a shadow on the inner surface portions of 9G and 29R and for blocking stray light reflected by the inner surface portions.

The stray light blocking sleeves 29B, 2 are also provided.
9G, 29R inner diameter 2k, the stray light blocking sleeve 29
The total length of B, 29G, and 29R is h, and the projection lens 4B,
Assuming that the rear surface outer diameters of 4G and 4R are a and the raster outer shape is b, the minimum front-rear spacing δ of the diaphragm plate 118 at an arbitrary position x is geometrically determined. That is, if k- (a / 2) = c and k- (b / 2) = d, then (a / 2) + c = (b / 2) + d = k; (Equation 1) The distance to the base end of the front diaphragm plate 118, which serves as a diaphragm plate for blocking primary reflection, is m.
The height of 18 is y, the distance from the point ε to the base end of the rear diaphragm plate 118 is n, and the height of the rear diaphragm plate 118 is z.
Then, y / m = (a + c) / (m + x); (Equation 2) z / n = (b + d) / (h−x−m); (Equation 3) y = c + [(d−c) x / h]; (Formula 4) z = y + [(dc) (x + m + n) / h] = c +
[(D−c) (2x + m + n) / h]; (Equation 5) By the way, when the above Equation 2 is transformed, m = xy / (a + c−y) = x / [((a + c) / y)
−1] Furthermore, substituting the above equation 4, m = x / [− 1+ (a + c) / (c + (dc) x /
h)]; (Equation 6) Then, for n, by substituting the above Equation 5 into the above Equation 3, (b + d) n = [c + (dc) (2x + m + n) /
h] (h−x−m) n = [c + (d−c) (2x + m) / h] / [b + d−
(D−c) (h−x−m) / h]]; (Formula 7) By substituting the above formula 6 into the above formula 7, n can be displayed as a function of x. That is, the relative positional relationship δ = m + n of the diaphragm plate 118 at an arbitrary x can be determined.

Further, as shown in FIG. 28, the diaphragm plate 118 is provided at the position closest to the cathode ray tubes 27B, 27G and 27R, so that the cathode ray tubes 27B and 27R can be formed.
It is possible to block the light generated around the raster of the G, 27R tube surface.

Then, the stray light blocking sleeve 29B,
The inner surface portions of 29G and 29R are subjected to antireflection treatment to prevent stray light. Particularly, the flocking treatment using flannel, velvet, etc. is most effective. As anti-reflection treatment,
When it is formed of a synthetic resin material, the material itself can be colored. A black matte coating can also be used as an antireflection treatment.

The stray light blocking sleeves 29B, 2 are also provided.
The 9G and 29R may be configured by removing the inner lens from the existing lens barrel and diverting this lens barrel, and providing the multistage diaphragm plate 118 and the antireflection treatment inside the barrel.

As shown in FIG. 30, the diaphragm plate may be a diaphragm plate 119 arranged so as to be inclined with respect to the optical axis. In this case, it is possible to reduce the number of diaphragm plates 119 required for sufficiently blocking stray light. Further, as the diaphragm plate, as shown in FIG. 31, a bellows 120 may be provided inside the stray light blocking sleeves 29B, 29G, 29R.

The stray light blocking sleeves 29B, 2 are also provided.
As shown in FIG. 32, 9G and 29R are video projector devices configured by directly mounting lens mounts 10B, 10G and 10R supporting projection lenses 4B, 4G and 4R on the front panel 9 of the outer casing. Can also be used.

As described above, in the video projector device according to the present invention, the gantry 23 allows the optical axes of the cathode ray tubes 27B, 27G and 27R and the optical axes of the projection lenses 4B, 4G and 4R to be aligned with each other. Matched with high precision.

Further, each of the projection lenses 4B, 4G, 4R described above
Is supported by the lens bracket 3 on the pedestal 23 independently of the main body 1, so that the stability of the device is good. The lens bracket 3 is attached to the mount 2
3 is provided perpendicularly to the projection lens 4 and
The weights of B, 4G and 4R directly affect the lens bracket 3
Since it is vertically applied to the pedestal 23 through, the moment caused by the weight of the projection lenses 4B, 4G, 4R can be minimized.

The lens bracket 3 is attached to the mount 23.
On the other hand, by adopting a detachable structure or a foldable structure, it is possible to achieve compactness during movement.

Further, in this video projector device, since the base 16 has the leg portions 17 capable of adjusting the expansion and contraction at least at three or more places, even if the installation surface is an inclined surface, each leg is provided. By adjusting the expansion and contraction of the portion 17, it is possible to secure the levelness of the main body portion 1. In addition, the pivot joint 1 is attached to the lower end of each leg 17.
The foot portion 18 provided via 08 can sufficiently secure the holding to the inclined surface.

In the adjustment at the time of projecting the image, when the horizontalness of the left and right of the screen is impaired, the left and right legs 17
It is possible to adjust the horizontality by adjusting the expansion and contraction of. Even in the vertical projection, by adjusting the expansion and contraction of each leg 17,
Similar to the adjustment in the horizontal direction, upward launch projection is possible from downward strike. Further, since the pedestal 23 and the pedestal 16 are connected to each other at the rear end side portions by the angle adjusting mechanism 26, fine adjustment in the vertical direction during projection can be performed manually.

In this video projector device, a stray light blocking sleeve is provided between the tube surface (panel surface) of each cathode ray tube 27B, 27G, 27R and each projection lens 4B, 4G, 4R (rear surface). 29B, 29G, 2
By providing 9R, each cathode ray tube 27
Light leakage from the tube surfaces of B, 27G, and 27R to the outside of the main body portion 1, for example, from the top surface ventilation port 6 of the exterior portion is prevented. Such stray light blocking is particularly effective under conditions where the projection environment is close to darkness and stray light may be reflected on the inner wall of the dome, which is typical for planetarium and the like.

The stray light blocking sleeves 29B,
29G and 29R are adjacent cathode ray tubes 27B and 27G,
It is also effective for the stray light phenomenon in which the light from the tube surface of 27R is projected on the inner wall of the dome, which is the projection surface, through the projection lenses 4B, 4G, and 4R. Further, the stray light blocking sleeves 29B, 29G, 29R can prevent the stray light phenomenon due to reflection of various components in the outer casing of the main body 1 and the inner wall of the outer casing.

The stray light blocking sleeves 29B, 29G,
The internal structure of 29R includes the cathode ray tubes 27B and 2B.
The stray light blocking sleeve 29B, which is provided with a multi-stage diaphragm plate 118 having an opening formed by cutting the optical path in a longitudinal direction in a circular shape, is provided between the 7G, 27R and the projection lenses 4B, 4G, 4R. Blocking of reflected light on the inner surface of 29G, 29R and the cathode ray tubes 27B, 27G, 27R
It is possible to block light from outside the raster surface of the tube surface. Therefore, it is possible to improve the contrast of the projected image and prevent mist-like stray light generated around the image when an image with particularly high brightness is projected in a dark environment such as in the planetarium.

Further, in this video projector device, the above-mentioned eye height blocking sleeves 29B, 29G, 29 are provided.
By R, safety standard measures for preventing contact of the live part with the injection holes 5B, 5G, 5R of the main body 1 are taken.

[0078]

As described above, in the video projector apparatus according to the present invention, the plurality of projection lenses corresponding to the respective cathode ray tubes are attached to the frame supporting the main body containing the plurality of cathode ray tubes. The lens bracket is
The projection lenses are supported so that their optical axes coincide with the axes of the corresponding cathode ray tube. Therefore, this video projector device can form a good projection image when the projection distance is sufficiently long.

Further, in the above-mentioned video projector device, when the gantry is supported on the base so as to be capable of tilt adjustment via the support shaft,
The elevation angle (angle of dip) of the mount can be easily adjusted.

Further, in the above-mentioned video projector device, in the case where the support shaft is provided at the front side of the main body portion which is the projection lens side,
The movement of the projection lens can be reduced when adjusting the inclination around the support shaft.

In each of the above video projector devices, an angle adjusting mechanism is provided between the mount and the base, and the angle adjusting mechanism is provided on the base and faces the mount. When the advancing / retreating member is operated and the advancing / retreating member is composed of a connecting member for connecting the advancing / retreating member and the pedestal through two universal joint portions, the inclination of the pedestal can be accurately adjusted. Can be done delicately.

Further, in each of the above-mentioned video projector devices, three or more leg portions which can be adjusted to extend and retract downward from the base are arranged, and the legs are connected to the lower end sides of the leg portions through pivot joints. If the base is attached, even if the base is installed on an inclined surface, the base can be easily and easily
In addition, it can be reliably held in the horizontal state.

That is, according to the present invention, even when a projection lens having a long focal length is used to realize a long projection distance, the chassis or the like is prevented from being deformed by the moment due to the weight of the projection lens. In addition, it is possible to provide a video projector device capable of obtaining a good projected image and preventing the stability of the entire device from being impaired.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a video projector device according to the present invention.

FIG. 2 is a side view showing a configuration of the video projector device.

FIG. 3 is a plan view showing a configuration of a base and a gantry of the video projector device.

FIG. 4 is an enlarged vertical sectional view of an essential part showing a configuration of a mounting portion of a lens bracket in the video projector device.

FIG. 5 is a side view showing a state in which a lens bracket is attached to the video projector device.

FIG. 6 is a side view showing another example of a configuration for attaching a lens bracket in the video projector device.

FIG. 7 is a side view showing a configuration in which the lens bracket is foldable in the video projector device.

FIG. 8 is a side view showing a partially broken structure of a projection lens used in the video projector device and a lens mount that supports the projection lens.

FIG. 9 is a side view showing a partially broken view of another example of the configuration of the projection lens and a lens mount that supports the projection lens.

FIG. 10 is a side view showing still another example of the configuration of the projection lens and a lens mount that supports the projection lens with a part thereof cut away.

FIG. 11 is a side view showing a configuration of a base and a gantry of the video projector device.

FIG. 12 is an enlarged plan view of an essential part showing a configuration of a connecting portion between a base and a gantry in the video projector device.

FIG. 13 is an enlarged side view of an essential part showing a configuration of a connecting portion between the base and the gantry.

FIG. 14 is an enlarged exploded side view of essential parts showing another example of the configuration of the connecting portion between the base and the gantry in the video projector device.

FIG. 15 is an enlarged side view showing a configuration of an angle adjusting mechanism in the video projector device.

FIG. 16 is an enlarged side view showing an example in which a pantograph mechanism is used as the angle adjusting mechanism.

FIG. 17 is an enlarged side view showing an example of the angle adjusting mechanism in which the bevel gear is used and the adjusting knob is provided on the side.

FIG. 18 is an enlarged side view showing an example of the angle adjusting mechanism using a turnbuckle.

FIG. 19 is a longitudinal sectional view of an essential part showing a configuration of a leg portion of the video projector device.

FIG. 20 is an enlarged side view showing a configuration of a foot portion on a lower end side of the leg portion.

FIG. 21 is a front view showing a state in which the video projector device is installed on the left and right inclined surface portions.

FIG. 22 is a side view showing a state in which the video projector device is installed on a front and rear inclined surface portion.

FIG. 23 is a side view showing a state in which the optical axis of the projection lens is tilted back and forth in the video projector device.

FIG. 24 is an exploded perspective view showing the configuration of the main body of the video projector device.

FIG. 25 is a perspective view showing a configuration of a stray light blocking sleeve used in the video projector device.

FIG. 26 is a perspective view schematically showing a positional relationship between a cathode ray tube and a stray light blocking sleeve in the video projector device.

FIG. 27 is a vertical sectional view showing the positional relationship between the cathode ray tube and the stray light blocking sleeve in the video projector device.

FIG. 28 is a vertical sectional view schematically showing a reflected state of stray light in the stray light blocking sleeve.

FIG. 29 is a longitudinal cross-sectional view of a main part schematically showing how to determine the size of a diaphragm plate for preventing reflection of stray light in the stray light blocking sleeve.

FIG. 30 is a vertical cross-sectional view showing another example of the configuration of the stray light blocking sleeve in the video projector device.

FIG. 31 is a vertical cross-sectional view showing still another example of the configuration of the stray light blocking sleeve in the video projector device.

FIG. 32 is a side view showing a video projector device configured without using the gantry and the base.

FIG. 33 is a side view showing a support structure of a projection lens having a long focal length in a conventional video projector device.

[Explanation of symbols]

 1 Main Body 2 Fixing Stand 3 Lens Bracket 4B Projection Lens 4G Projection Lens 4R Projection Lens 16 Base 17 Legs 18 Feet 19 Support Shaft 23 Mount 26 Angle Adjustment Mechanism 27B Cathode Ray Tube 27G Cathode Ray Tube 27R Cathode Ray Tube 29B Stray Light Blocking Sleeve 29G Stray light blocking sleeve 29R Stray light blocking sleeve 67 First pivot 68 Second pivot 73 Elevating rod part 118 Iris plate

Claims (5)

[Claims] 1. A main body including a plurality of cathode ray tubes, a mount for supporting the main body, and a lens bracket mounted on the mount for supporting a plurality of projection lenses corresponding to the cathode ray tubes. A video projector device in which the lens bracket supports each of the projection lenses in a position where the optical axis of the projection lens coincides with the axis of the corresponding cathode ray tube. 2. The video projector device according to claim 1, wherein the gantry is supported on a base so as to be capable of tilt adjustment via a support shaft. 3. The video projector device according to claim 2, wherein the support shaft is provided on the front side, which is the projection lens side of the main body. 4. An angle adjusting mechanism is provided between the gantry and the base, and the angle adjusting mechanism is provided on the base and is operated to move back and forth toward the gantry. 3. An advancing / retreating member and a connecting member for connecting the pedestal via two universal joint portions, or
The video projector device according to claim 3. 5. A leg portion is provided on the lower end side of the leg portion via a pivot joint, the leg portion having three or more adjustable legs which are arranged downward from the base. Claim 2, Claim 3, or
The video projector device according to claim 4.