JPH0411475A - Video projector device - Google Patents

Abstract

PURPOSE:To make a gate angle large by making the angle formed by a lens plate to support a lens group and the front panel part of a cathode ray tube changable by attaching-detaching/exchanging operation of a spacer. CONSTITUTION:A lens plate 9 is fitted to be attachable and detachable to the front end part of a supporting frame 3. A lens barrel 16 is fitted to the plate 9 and when a cathode ray tube 1 displays an image on a frontal panel part 1a, the image is projected to a screen and so on by a projecting lens 18. Then, when a gate operation is executed, an angle to the front panel part 1a of the plate 9 is changed with interposing a spacer fromed with possessing the various thicknesses between a supporting frame 3 and the plate 9. Thus, the optical property of the projecting lens can be set arbitrarily and distance to the screen and the size of the projected image can be set freely.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a video projector device that projects an image displayed by a cathode ray tube onto a screen using a projection lens.

B0 Summary of the Invention The present invention provides a so-called liquid-cooled optically coupled video projector device in which a cooling liquid is filled between the front panel of a cathode ray tube and a projection lens that projects images displayed by the cathode ray tube onto a screen. A support frame is attached to the peripheral edge of the front panel of the cathode ray tube, a lens plate that supports the projection lens is attached to the support frame via a flexibly displaceable bellows, and a spacer is provided between the support frame and the lens plate. By interposing the spacer in a removable manner, the angle between the lens plate and the front puffer portion of the cathode ray tube can be changed by attaching and detaching and/or replacing the spacer, so that so-called tilting operation can be performed well. This is what I did.

C1 Prior Art Conventionally, a video projector device has been proposed which is configured to display an image using a cathode ray tube and project the image onto a screen via a projection lens. In such a video projector device, since the image displayed by the cathode ray tube is enlarged and projected by the projection lens, it is possible to easily display an image on a screen larger than the front panel of the cathode ray tube. can.

Incidentally, the number of pixels of an image displayed by the cathode ray tube is determined by the conversion method of the image signal supplied to the cathode ray tube. When displaying a so-called color image using this cathode ray tube, a blue component image, a green component image, and a red component image of the color image are displayed using a pixel number that is 1/3 of the predetermined number of pixels. Therefore, the number of pixels for displaying images of each color component is reduced.

Therefore, when trying to display a color image using the video projector device described above, the number of pixels for displaying each color component image of the color image is increased to project a good image. a first cathode ray tube 1m for displaying a blue component image of a color image to be displayed;
A second cathode ray tube IG for displaying the green component image of the color image; and a third cathode ray tube IG for displaying the red component image of the color image. Use l. Each of these cathode ray tubes 11. The images of each color component displayed by IG and IR are projected by projection lenses 1 arranged so as to face each other in correspondence with the front panel parts of each of these cathode ray tubes 1m, 1G, and 1+1.
B, 18. It is projected onto the screen S via 18. The color components of the color image projected onto this screen S are superimposed on each other on this screen S to form a color image.

In this way, the first to third cathode ray tubes]1. IG.

In a video projector device configured to project a color image using 11, each of the cathode ray tubes Is, lc
, 1 m, each projection lens 1818.18 has an optical axis a or + ac of these projection lenses 18,18.18.
I''jl are arranged so that they intersect at the center of the screen S.In this video projector device, the images of each color component of the color image displayed by the cathode ray tubes 1m, 1G, and 1++ are respectively In order to properly form an image on the screen S, it is necessary to adjust the angle between the optical axis of the projection lens 18 and the front panel of the cathode ray tube corresponding to the projection lens 18, a so-called tilt operation.

On the other hand, conventionally, a cooling liquid made of a transparent liquid having approximately the same refractive index as the glass constituting the front panel and the projection lens has been filled between the front panel of the cathode ray tube and the projection lens. Cold optical coupling (Riki,
A video projector device using optical coupling has been proposed. In this video projector device, it is possible to project a good image with high contrast by suppressing the interface reflection that occurs between the front panel section and the entrance surface of the projection lens, and also to cool the front panel section and make the projection lens The stability of the optical properties of the device and the durability of the device can be improved.

The present applicant previously developed a video projector device as described in Japanese Patent Application Laid-Open No. 1101077 in order to easily perform a tilt operation in a liquid-cooled optically coupled video projector device as described above. is suggesting.

That is, in this video projector device, as shown in FIG. 5, a support frame 103 is attached to the peripheral edge of the front panel portion of the cathode ray tube 101 via a banking 102. An incident lens 105 is attached to this support frame 103 via an O-ring 104. The front panel portion of these cathode ray tubes 101, the support frame 1
03 and the above-mentioned input lens 105, a sealed space is formed, and a cooling liquid 106 is filled and sealed in this space. A lens barrel 108 that supports lens groups 109 and 110 that together with the incident lens 105 constitute a projection lens is attached to the support frame 103.

A spacer 107 is removably interposed between the support frame 103 and the lens barrel 108. This spacer 1
07, as shown in FIG. 6, is formed in an annular shape with the negative side inclined with respect to the other side. Further, this spacer 107 is provided with a reduced diameter portion 107a on the negative side.

The lens barrel 108 includes a mount portion 10 provided on the rear end side.
8C is configured to fit into the reduced diameter portion 107a of the spacer 107 on the rear end side. This lens barrel 108 is
By interposing the spacer 107 between the lens barrel 108 and the support frame 103, the cathode ray tube 1
It is supported in an inclined state with respect to the front panel section of 01.

That is, in this video projector device, tilting operation can be performed by appropriately attaching, detaching, and replacing the spacer 107.

In this video projector device, the lens barrel 108 is fitted with a front barrel 108 that is slidably fitted to each other.
b and a rear tube 108a, and the focus can be adjusted.

D0 Problem to be Solved by the Invention By the way, in a liquid-cooled optically coupled video projector device in which the tilt operation is performed using the spacer 107 as described above, the front surface of the cathode ray tube 101 of the incident lens 105 is Since the position relative to the panel section is fixed, the only lens group that is tilted by the tilt operation is the lens group 1 of the projection lenses, excluding the above-mentioned input lens 105.
Only 09°110.

Therefore, in this video projector device, the lens configuration of the projection lens is limited.

That is, the entrance lens 105 is the cathode ray tube 10.
A first surface facing the front panel portion of No. 1 is a convex surface bulging toward the front panel portion, and a second surface facing the first surface is a convex surface that bulges toward the front panel portion.
The surface must be a concave surface sunken toward the front panel section. In order to maintain the optical characteristics of the projection lens when performing the tilt operation, the lens group 1
This is because it is necessary to rotate and tilt the lenses 09 and 110 around the center of curvature of each surface of the input lens 105.

Therefore, in this video projector device,
It is difficult to increase the tilt angle, and it is also difficult to arbitrarily set the optical characteristics of the projection lens. Cannot be set. That is, there are restrictions on the magnification and angle of view of the projection lens, and for example, it is not possible to project a sufficiently large image without increasing the distance from the screen S to the video projector device.

Further, in this video projector device, the incident lens 105 and the cathode ray tube 1 of the support frame 103 are
Since the position of the cooling liquid 106 with respect to the front panel portion is fixed, the volume of the space in which the cooling liquid 106 is sealed is constant. Therefore, the cooling liquid 106 is
When it is heated by the front panel of 01 and causes thermal expansion, the internal pressure of this cooling liquid 106 rises, causing the cathode ray tube l
The front panel section of O1 is pressed. When the front panel portion of the cathode ray tube 101 is pressed in this way, distortion or the like may occur in the front panel portion, making it impossible to display good images, and there is a risk of deterioration of durability. .

Therefore, the present invention is proposed in view of the above-mentioned actual situation, and it is possible to increase the tilt angle, and
The optical characteristics of the projection lens can be set arbitrarily, and the distance to the screen and the size of the projected image can be freely set. It is an object of the present invention to provide a liquid-cooled optically coupled video projector device that can display images and maintain good durability.

E9 Means for Solving the Problems In order to solve the above problems and achieve the above objects, a video projector device according to the present invention includes a cathode ray tube, a support frame attached to the peripheral edge of the front panel of the cathode ray tube, and a support frame attached to the peripheral edge of the front panel of the cathode ray tube. an input lens that is attached to the support frame via a flexibly displaceable bellows and faces the front panel; and an input lens that is attached to the input lens and supports a lens group that together with the input lens constitutes a projection lens; a lens plate that is removably attached to the lens plate; a cooling liquid that is filled between the front panel portion and the input lens and is hermetically held by the front panel portion, the input lens, the support frame, and the bellows; A spacer is provided that is removably interposed between the support frame and the lens plate, and the angle between the lens plate and the front panel portion is changed by attaching, detaching and/or replacing the spacer. It is something that is made possible.

F9 action In the video projector device according to the present invention, the cathode ray tube and the lens plate are attached to the input lens by attaching/detaching and/or interchanging the spacer, and support the lens group which together with the input lens constitutes the projection lens. Since the angle formed between the projection lens and the front panel section can be changed, the entire projection lens can be tilted to perform a tilt operation.

Furthermore, even if the cooling liquid filled between the front panel of the cathode ray tube and the entrance lens is heated and thermally expands, the bellows that seals and holds this cooling liquid flexibly displaces. The internal pressure of the liquid will not increase.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

A video projector device according to the present invention includes a cathode ray tube 1, as shown in FIG.

The cathode ray tube 1 is configured to be supplied with a predetermined video signal and to display a video corresponding to the video signal on a front panel portion la formed in the shape of a substantially rectangular and substantially planar plate.

A support frame 3 is attached via banking 2 to the peripheral edge side of the front panel portion 1a. The backing 2 is made of a material such as a silicone adhesive, for example. The support frame 3 is made of a material such as metal to support the front panel portion 1.
It is formed into a substantially rectangular frame shape corresponding to a.

A first bellows support protrusion 3c is integrally formed on the inner wall of the support frame 3 to protrude over the entire circumference. This first bellows support protrusion 3c has a bellows 6
The outer peripheral edge side of is attached.

The bellows 6 is made of a flexibly displaceable material such as rubber, and is formed into a frame shape whose outer periphery corresponds to the inside of the support frame 3 and whose inner periphery is a circular opening. . Further, the bellows 6 is formed with a bent portion over the entire circumference to facilitate flexible displacement. The outer peripheral side of the bellows 6 is provided with the first bellows support protrusion 3c,
It is attached to the support frame 3 by being sandwiched between a heros presser frame 5 attached to the support frame 3 by a plurality of retaining screws 4. The sheath presser frame 5 is made of a material such as metal and is formed into a substantially rectangular flat frame shape so as to correspond to the inner side of the support frame 3. Note that a protrusion 6a is provided on the outer circumferential edge side of the sheath 6 in order to ensure that this outer circumferential edge side is held between the first sheath support protrusion 3c and the sheath presser frame 5. It is formed integrally with the bellows 6.

An input lens 12 is attached to the inner peripheral edge side of the tube 6 through an input lens support ring 7 on the front side of the front panel section 1a so as to face the front panel section 1a. .

That is, the incident lens support ring 7 is formed in an annular shape from a material such as metal, and has a second bellows support protrusion 7a integrally protruding over the entire outer circumference. Further, a lens plate 9 is attached to the front side of the input lens support ring 7 opposite to the rear side opposite to the front panel portion 1a by a plurality of stopper fins 8.

The lens plate 9 is made of a material such as metal and is formed into a substantially rectangular flat plate shape corresponding to the support frame 3 having a circular opening corresponding to the incident lens 12 in the center thereof. The inner circumferential edge side of the sheath 6 is formed by the second sheath support protrusion 7a and the lens plate 9.
This lens plate 9 is held together with a herose holding ring 10 arranged on the rear side. The heath retainer ring 10 is made of a material such as metal and is formed into an annular shape corresponding to the inner circumferential edge of the sheath 6.

Note that a protrusion 6b is provided on the inner circumferential edge side of the bellows 6 in order to ensure that the inner circumferential edge side is held between the second bellows support protrusion 7a and the lens plate 9.
is formed integrally with this bellows 6.

The input lens 12 is supported by being sandwiched between the input lens support ring 7 and the lens plate 9 at its outer peripheral edge side. An O ring 11 is interposed between the input lens 12 and the input lens support ring 7.

In this way, when the support frame 3, the rosette 6, the entrance lens 12, etc. are attached to the cathode ray tube l, the front panel portion 1a and the entrance lens 12 are attached to the cathode ray tube l.
A sealed gap is formed between the two. A cooling liquid 13 is filled between the front panel portion 1a and the incident lens 12. That is, this cooling liquid 13
is hermetically held by the front panel portion 1a, the incident lens 12, the support frame 3, and the rosette 6. The cooling liquid 13 is a transparent liquid having a refractive index substantially equal to that of the glass material forming the front panel portion 1a and the incident lens 12. The cooling liquid 13 prevents interface reflections at the front panel 1a and the incident lens 12, and cools the front panel portion 1a, which is heated when an image is displayed.

By the way, in this video projector device, when the cooling liquid 13 cools the front panel section 1a,
This cooling liquid 13 is heated and expands thermally, but at this time,
Since the melting rose 6 flexibly displaces in response to the thermal expansion of the coolant 13, the internal pressure of the coolant 13 does not increase.

Note that the support frame 3 is provided with a coolant injection hole 3a for injecting the coolant 13 into the gap between the front panel portion la and the incident lens 12. The coolant injection hole 3a is closed when the coolant 13 is completely injected into the gap.

The lens plate 9 is detachably attached to the front end of the support frame 3. That is, the front end of the support frame 3 is provided with a plurality of screw holes 3b. A plurality of mounting screws 15 are screwed into these screw holes 3b, which are inserted through a plurality of insertion holes corresponding to the screw holes 3b in the lens plate 9. At this time, the lens plate 9 is supported in parallel to the front panel portion 1a.

Further, on the front side of the lens plate 9, a lens barrel 16 that holds a lens group (not shown) that constitutes the projection lens 18 together with the incident lens 12 is removably attached. This lens barrel 16 is provided with a mount portion 17 at its rear end. In this installation, the mount part 17 has a plurality of support pins 17b that protrude toward the rear side.
The lens plate 9 is supported by fitting the plurality of support pins 17b into the plurality of support holes 9a provided in the lens plate 9. In addition, in this installation, the mount part 17 has a plurality of recesses 17 on the rear side to avoid contact with the screw head of the screw 8.
A is provided.

The lens barrel 16 includes a focus adjustment mechanism (not shown) that allows the lens group to be moved toward and away from the front panel portion 1a.

In the video projector device configured as described above, the lens barrel 16 is attached to the lens plate 9, and when the cathode ray tube 1 displays an image on the front panel portion 1a, this image is transmitted to the projection lens 18. The image is projected onto a screen, etc.

In this video projector device, when performing a so-called tilt operation, spacers formed with various thicknesses are interposed between the support frame 3 and the lens plate 9, so that the lens plate 9 The angle with respect to the front panel portion 1a is changed.

As shown in FIG. 2A, the first spacer 14 is made of a material such as metal and has a plate shape with a predetermined thickness. This first spacer 14 has a length extending from the screw 15 at one attachment point to the screw 15 at another attachment point adjacent to this attachment screw 15 .

The first spacer 14 is provided with grooves 14a on one end and the other end, respectively, into which the screws 15 can be inserted. That is, the first spacer 14 is installed by loosening the screws 15 and forming a gap between the support frame 3 and the lens plate 9.
The screws 15 are inserted into the gaps in each of the grooves 14a, and the screws 15 are inserted into the gaps.
5, the lens plate 9 is interposed between the support frame 3 and the lens plate 9.

Further, as shown in 211aB, the second spacer 19 has a thickness smaller than that of the first spacer 14,
It is formed similarly to this first spacer 14.

Note that the spacer is the first and second spacer 1.
The thickness is not limited to 4.19, and thicknesses having various thicknesses can be used.

In this video projector device, if - or a plurality of spacers are interposed between the support frame 3 and the lens plate 9, the thickness of the spacer used or the difference in thickness of each spacer used may be Then, the helix 6 is flexibly displaced, and the angle of the lens plate 9 with respect to the front panel portion 1a is changed. Then, all the lenses constituting the projection lens 18, including the entrance lens 12, are tilted with respect to the front panel portion 1a.

In order to display a color image on the screen using the video projector device configured as described above, three video projector devices, first to third, are used as shown in FIG. Cathode ray tube of the first video projector device 1. displays the blue component image of the projected color image. The cathode ray tube IG of the second video projector device is
A green component image of the above color image is projected. Then, the cathode ray tube 1++ of the third video projector device projects the green component image of the color image. In addition, the first
The third to third video projector devices are arranged such that the optical axes am, a, a,
, +all+ are arranged so that they intersect at the center of the screen S. At this time, each cathode ray tube In, IGI
A tilting operation is performed so that the image of each color component displayed by IR is well formed on the screen S by the corresponding projection lens 18.

This tilt operation is performed assuming that the optical axis aG of the projection lens 18 of the second video projector device is perpendicular to the screen S, and that the optical axis al+aJ+ of the projection lens 18 of the first and third video projector devices is Optical axis a
Assuming that the angle formed with respect to c is θ, in the first video projector device, this is done by tilting the cathode ray tube 1 by an angle ψ with respect to the optical axes a and l. Here, when the projection magnification of the projection lens 18 is m and the refractive index of the cooling liquid 13 is n, the angle ψ is ψ=t
The angle is defined as an −' ((n7m) tan θ).

In the third video projector device, tilt and tilt operations are performed in the same manner as in the first video projector device.

Further, as shown in FIG. 4, each of the video projector devices is spaced apart from the screen S so that the optical axes al+ajl of the projection lenses 18 of the first and third video projector devices are aligned with the second video projector. When the angle formed with the optical axis aG of the projection lens 18 of the device is θ', ψ' −tan −' ((n/m)
A tilting operation is performed to tilt each cathode ray tube IBIR with respect to each optical axis al+aR by an angle ψ' represented by tan θ').

H0 Effects of the Invention As described above, in the video projector device according to the present invention, by the operation of attaching and detaching and/or replacing the spacer,
The angle between the front panel of the cathode ray tube and a lens plate attached to the input lens and supporting a group of lenses that together with the input lens constitute a projection lens can be changed.

Therefore, in this video projector device, the entire projection lens can be tilted and tilted by a simple operation.

Moreover, even if the cooling liquid filled between the front panel of the cathode ray tube and the entrance lens is heated and thermally expands, the bellows that seals and holds this cooling liquid flexibly displaces. The internal pressure of the liquid will not increase. Therefore, even if the coolant expands thermally, the front panel portion of the cathode ray tube will not be pressed, and no distortion or the like will occur in the front panel portion.

That is, according to the present invention, the tilt angle can be increased, and the optical characteristics of the projection lens can be arbitrarily set, so that the distance to the screen and the size of the projected image can be freely set. In addition to being able to
Even if thermal expansion of the coolant occurs, a good image can be displayed.
Furthermore, it is possible to provide a liquid-cooled optically coupled video projector device that maintains good durability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of a video projector device according to the present invention. FIG. 2A is a perspective view showing the shape of a spacer used in the video projector apparatus, and FIG. 2B is a perspective view showing another example of the shape of the spacer. FIG. 3 is a plan view schematically showing the arrangement relationship between the video projector device and the screen, and FIG. 4 is a plan view showing the arrangement relationship between the video projector device and the screen in a state where the video projector device and the screen are further apart than in the case shown in FIG. 3. FIG. 2 is a plan view schematically showing the arrangement relationship between a video projector device and a screen. FIG. 5 is a longitudinal sectional view showing the configuration of a conventional video projector device, and FIG. 6 is a perspective view showing the shape of a spacer used in the conventional video projector device.

Claims (1)

[Scope of Claims] A cathode ray tube, a support frame attached to the peripheral edge side of the front panel portion of the cathode ray, and an incident tube attached to the support frame via a flexibly displaceable bellows and facing opposite to the front panel portion. a lens; a lens plate that is attached to the input lens, supports a lens group that together with the input lens constitutes a projection lens, and is detachably attached to the support frame; and between the front panel section and the input lens; filled with
A cooling liquid is hermetically held by the front panel portion, the incident lens, the support frame, and the bellows, and a spacer is removably interposed between the support frame and the lens plate. A video projector device, wherein the angle between the lens plate and the front panel section can be changed by attaching/detaching and/or replacing a spacer.