JP3246116B2 - Screen mounting structure of projection TV - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen mounting structure of a projection television for projecting a CRT display screen such as a television or a monitor, which is reflected by a mirror through a lens and is enlarged and projected on a screen.

[0002]

2. Description of the Related Art In recent years, in order to magnify a display screen of a television or monitor, for example, as shown in FIG. Projection televisions that enlarge and project to 1 have been put to practical use.
Further, as the screen 1 used in the projection television, as shown in FIG. 10, for example, a screen obtained by superimposing a Fresnel screen 2 and a lenticular screen 3 is used.

[0003] The Fresnel screen 2 has a function of changing the magnified light of the CRT display screen magnified by the lens to parallel light and forming an image of the magnified light on an image plane determined by the lens magnification. For example, when the screen screen is 40 to 50 inches in size made of acrylic or polycarbonate, the screen thickness is about 1.5 mm. The lenticular screen 3
Has a function of diffusing the parallel light transmitted through the Fresnel screen 2 in order to widen the viewing angle of the imaging screen. The material is, for example, formed of acrylic, and the screen screen has a size of 40 to 50. 1 mm for inches
It is formed to a plate thickness of about.

As shown in FIG. 1, the periphery of the screen 1 is attached to a frame 4. That is, the frame frame 4 has an L-shaped cross section, is formed in a frame shape large enough to accommodate the screen 1, and presses the peripheral portion of the screen 1 housed in the frame frame 4 from the rear by four pressing members. It is attached by screwing via a member 5. Conventionally, the mounting structure between the frame 4 and the screen 1 is as follows: 1) the structure shown in FIGS. 11A and 11B, and 2) the structure shown in FIGS. 12A and 12B. Is installed.

In the screen mounting structure 1), a column-shaped mounting portion 25 having a female screw 24 and a fitting projection (a dowel) 26 are provided on the inner surface of each side of the frame 4 so as to be spaced apart from each other. The holding member 5 is provided with a through hole 28 through which the body of a screw (screw) 27 penetrates in correspondence with the mounting portion 25, and the fitting protrusion 26 is fitted in correspondence with the fitting protrusion 26. A hole (a dowel hole) 29 is provided. Then, in order to mount the screen 1 on the frame 4, the fitting protrusion 26 is fitted into the fitting hole 29 of the holding member 5, and the mounting portion 25 is positioned in the through hole 28, and then the through hole 28 is inserted. Screw 27 on the female screw 24 of the mounting portion 25
Is screwed.

In the screen mounting structure 2), a columnar mounting portion 25 having a female screw 24 is protruded from the inner surface of each side of the frame 4, and each holding member 5 is attached to the mounting portion 25. Correspondingly, a through hole 30 through which the head of the screw 27 penetrates is provided.
Are continuously provided. Then, in order to attach each holding member 5 to the frame 4 via the screen 1, a screw 27 is first screwed halfway into the mounting portion 25, and the head of the screw 27 is inserted into the through hole 30. After insertion, as shown by the arrow in the figure,
The body of the screw 27 is slid into the elongated hole 31 to be screwed.

[0007]

However, in the above-mentioned screen mounting structure 1), the bracket is stopped when the screen is removed from the frame or when the screen is removed or replaced in order to replace the screen or remove dirt. All of the screws must be removed and attached, which is very time-consuming and may cause the screws to drop onto the screen and damage the screen surface when the screws are attached. Further, the screen mounting structure of the above 2) has an advantage that the screen can be removed only by loosening the screw, but the operation of turning the screw twice is required at the time of the first mounting, so that the mounting work cannot be simplified. There is. Incidentally, as described above, the projection television screen is liable to be cracked or scratched due to manufacturing weakness caused by the thinness of the plate thickness, and the image quality is easily deteriorated due to dirt. It is an indispensable condition that a screen having no protective function is easily attached and detached. Therefore, the present invention
An object of the present invention is to provide a screen mounting structure for a projection television, which can surely prevent the screen surface from being damaged and facilitates the mounting and removing operations of the screen.

[0008]

In order to achieve the above object, the present invention provides a projection television in which the periphery of a screen is sandwiched between a frame and a pressing member extending along the periphery, and the screen is fastened by screws. In the screen mounting structure of (1), a columnar mounting portion and a positioning projection are projected from the frame frame at intervals in a longitudinal direction of a pressing member provided on the frame frame, and the columnar mounting portion and the positioning A long hole for attachment and a long hole for positioning are respectively formed at locations of the pressing member corresponding to the projections, and a female screw to be screwed to the screw is formed at the columnar attachment portion,
The mounting long hole has a large-diameter portion large enough to allow the head of the screw to pass therethrough, and a small-diameter extending in the longitudinal direction of the holding member with a width that allows communication with the large-diameter portion and allows the body of the screw to pass therethrough. The positioning long hole is formed so as to extend in the longitudinal direction of the pressing member with a width that allows the positioning projection to be inserted, and the positioning projection is inserted through the positioning long hole. In a state where the column-shaped mounting portion is located below the large-diameter portion of the mounting long hole and the positioning projection is positioned at an end of the positioning long hole, the female screw of the column-shaped mounting portion is It is formed so as to be located below the small diameter portion.

Further, according to the present invention, the positioning long hole may include:
It is characterized in that it is formed in the same shape as the mounting long hole. Further, the present invention is characterized in that the large-diameter portion is formed so as to extend in the longitudinal direction of the holding member, and the mounting long hole also serves as the positioning long hole. Further, the present invention is characterized in that the columnar mounting portion and the positioning projection are connected by a wall portion.

[0010]

First, when the screen is to be mounted in the frame, the screen is accommodated in the frame and set, the positioning projection is inserted into the positioning slot, and then the pressing member is slid in the longitudinal direction. When the positioning projection is positioned at the end of the positioning long hole, the mounting portion is positioned at the small diameter portion of the mounting long hole. Then, a screw is screwed into the female screw of the mounting portion which can be seen from the small diameter portion, and the screw is tightened, whereby the periphery of the screen is sandwiched between the pressing member and the frame, and the screen is mounted. When the screen is replaced, the screw is loosened, and then the pressing member is slid to position the screw at the large diameter portion, and the pressing member is lifted to remove the pressing member. After replacing the screen, the screen is attached to the frame again by performing the reverse operation with the screws loosened from the female threads.

Accordingly, when the screen is mounted on the frame, the positioning of the mounting portion can be easily performed only by inserting the positioning protrusion into the positioning long hole and sliding the pressing member. Also, when the screen is first attached to the frame, it is sufficient to fasten the screw to the end without stopping it halfway, so screw the screw first halfway and then tighten the screw to the end as in the conventional case This makes it possible to eliminate the work of tightening the screw which is troublesome twice, and simplifies the mounting work. Further, when replacing the screen, the holding member can be removed simply by loosening the screw attached to the attachment portion, and it is possible to prevent the screw from being dropped and damaging the screen surface.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, a description will be given of the first embodiment in which the mounting slot and the positioning slot are used in combination. FIG. 1 is an exploded perspective view showing a frame frame and a screen, FIGS. 2A and 2B are perspective views for explaining a mounting operation of a pressing member when the screen is mounted, and FIGS. 3A and 3B are screen mounting. FIG. 4A is a plan view for explaining the mounting operation of the holding member at the time.
(B), (c) is a perspective view explaining the attaching work of the holding member at the time of screen replacement. Screen 1 of this embodiment
As shown in FIG. 1, a Fresnel screen 2 and a lenticular screen 3 are formed by superimposing, as shown in FIG. It is attached via a holding member 5. Further, in the present embodiment, FIG.
As shown in (c), on the inner surface of each side of the frame 4,
A column-shaped mounting portion 8 on which a female screw 6 is formed, and a positioning projection (a dowel) 9 project from the rear of the frame 4.

The mounting portion 8 and the positioning projection 9 are
Projections are provided at predetermined short distances along the longitudinal direction of each side of the frame frame 4, and are provided integrally via a connecting wall 10. One set of these mounting portions 8 and positioning projections 9
Are provided at three places on each side of the frame 4 as shown in FIG. The positioning projection 9 has an outer diameter equal to or smaller than the body of the screw 7 to be described later, and is formed to be longer than the mounting section 8. In the present embodiment, the positioning projections 9 are positioned on each side of the
Although provided at all of the locations, the number of locations may be two.

FIGS. 1 and 2 show the pressing members 5 respectively.
As shown in FIG. 1A, a long mounting hole 11 is provided at a position corresponding to each of the pair of mounting portions 8 and the positioning projections 9, and the mounting long hole 11 has a large diameter portion 12 and a small diameter portion 13. In this embodiment, this mounting slot 11 is
It also serves as a positioning slot through which the projection 9 is inserted.
The large-diameter portion 12 is provided with a screw 7 screwed to the mounting portion 8.
Is formed in an elliptical shape having a width larger than that of the head and having a length through which both the positioning projection 9 and the screw 7 attached to the attaching portion 8 can be inserted, and is provided along the longitudinal direction of the pressing member 5. Have been. The small-diameter portion 13 is formed in an elliptical shape having a width through which the body of the screw 7 attached to the attachment portion 8 can be inserted and longer than the dimension between the attachment portion 8 and the positioning projection 9. 12 and is formed in communication therewith.

In such a structure for mounting the screen 1, when the screen 1 is mounted in the frame 4, as shown in FIG.
The holding member 5 is attached to each side of the frame 4 from the rear through the peripheral portion of the screen 1. In this case, as shown in FIG. 2A, the large-diameter portion 12 provided on the holding member 5 is aligned with the mounting portion 8 provided on the frame 4 and the positioning projection 9, and the positioning projection 9 is formed. 2B and FIG.
As shown in FIG. 2A, the mounting portion 8 and the positioning projection 9 are positioned in the small-diameter portion 13 by sliding the holding member 5 in the longitudinal direction. Then, as shown in FIG. 3B, the screw 7 is screwed into the female screw 6 visible from the small diameter portion 13 of the holding member 5, and the screw 7 is tightened, so that the space between the holding member 5 and the frame 4 is formed. The screen 1 is attached.

When the screen 1 is replaced, the screen shown in FIG.
4A, the screw 7 fastened to the small diameter portion 13 is loosened, and then, as shown in FIG. 4B, the holding member 5 is slid to move the mounting portion 8 and the positioning projection 9 to each large. As shown in FIG. 4 (c), each holding member 5 is removed by lifting the holding member 5 as shown in FIG. 4 (c).
After the screen 1 is replaced, as shown in FIG. 4B, the screws 7 attached to the large-diameter portion 12 of the holding member 5 are used.
4A, the pressing member 5 is slid to position the screw 7 and the positioning projection 9 in the small-diameter portion 13 and tighten the screw 7 as shown in FIG. The screen 1 is mounted on the frame 4.

Therefore, in the present embodiment, the positioning projection 9 and the mounting portion 8 are integrally provided on the frame 4 so as to protrude, and the holding member 5 is provided with the mounting long hole having the large-diameter portion 12 and the small-diameter portion 13. 11, when the screen 1 is mounted on the frame 4, the positioning portion 9 can be easily positioned simply by inserting the positioning projection 9 through the large diameter portion 12 and sliding the holding member 5. be able to. Further, when the screen 1 is first mounted on the frame 4, the screw 7 may be fastened to the mounting portion 8 located in the small-diameter portion 13 without stopping halfway. In this case, it is possible to eliminate the work of tightening the screw 7 by screwing the screw 7 partway and then tightening the screw 7 to the end, thereby simplifying the mounting work. Also, when replacing the screen 1, simply loosen the screw 7 attached to the attachment portion 8,
The pressing member 5 can be removed, and it is possible to prevent the screw 7 from dropping and damaging the screen surface. In addition, since the positioning projection 9 is formed integrally with the mounting portion 8 by the connecting wall 10, the strength of the positioning projection 9 can be increased.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an exploded perspective view showing the frame and the pressing member according to the present embodiment, and FIGS. 6A and 6B are perspective views for explaining the mounting operation of the pressing member when the screen is mounted. FIG. 8B is a plan view for explaining the mounting operation of the holding member when the screen is mounted, and FIG.
(B), (c) is a perspective view explaining the attaching work of the holding member at the time of screen replacement. In the second embodiment, a long mounting hole 14 and a long positioning hole 15 are formed at positions of the holding member 5 corresponding to the columnar mounting portion 8 and the positioning projection 9, respectively. Unlike the first embodiment, the positioning slot 15 is formed in the same shape as that of the first embodiment. The frame 4 and the screen 1 are configured in the same manner as in the first embodiment, and four frames corresponding to each side of the frame 4 are formed. The screen 1 is attached via a holding member 5.

In this embodiment, FIGS. 5 and 8
As shown in (c), on the inner surface of each side of the frame 4,
The three mounting portions 8 on which the female screws 6 are formed, and the two positioning projections (dowels) 9 are equally spaced from each other.
It protrudes toward the rear of. In this embodiment, as shown in FIG. 5, mounting portions 8 are provided at the center and both ends. The positioning projection 9 has an outer diameter equal to or less than the body of the screw 7 described later. 5 and 8 (c), each of the holding members 5 has a mounting elongated hole 14 of the same shape and size as shown in FIG. Slots 15 for positioning are respectively provided, and slots 14 for mounting and slots 15 for positioning are each provided with a large-diameter portion 1.
6 and a small diameter portion 17. The large diameter portion 16
Is formed in a circular shape with a large diameter through which the head of the screw 7 attached to the attaching portion 8 can be sufficiently inserted.
Is formed along the longitudinal direction of the holding member 5 with a width slightly larger than the body of the screw 7, and the large-diameter portion 16 and the small-diameter portion 1 are formed.
7 is formed so as to communicate.

In the mounting structure of the screen 1 according to the present embodiment, when the screen 1 is mounted in the frame 4, as shown in FIG.
And set it. Then, as shown in FIG. 6A, each large-diameter portion 16 provided on the pressing member 5 is attached to each of the two positioning projections 9 provided on the frame 4 from the rear on each side of the frame 4. Then, the positioning projections 9 are inserted into the large-diameter portions 16 respectively, and then, as shown in FIG. The projection 9 is located, and at the same time the mounting part 8 is located in the other three small diameter parts 17. Then, as shown in FIGS. 7A and 7B, the screw 7 is screwed into the female screw 6 of the mounting portion 8 that can be seen from each small diameter portion 17 of the holding member 5, and the screw 7 is tightened. The screen 1 is attached to the frame 4 with the peripheral edge of the screen 1 interposed between the screen 1 and the frame 4.

When the screen 1 is replaced, the screen 1 shown in FIG.
As shown in (a), the screws 7 fastened to each small diameter portion 17
8 and then, as shown in FIG.
To position the screw 7 and the positioning projection 9 attached to the attachment portion 8 in each large-diameter portion 16, and FIG.
As shown in (2), each holding member 5 is removed by lifting the holding member 5. After the screen 1 is replaced, as shown in FIG.
8, a screw 7 and a positioning projection 9 are inserted.
As shown in (a), the screen 1 is attached to the frame 4 by sliding the pressing member 5, positioning the screw 7 and the positioning projection 9 in the small-diameter portion 17 and tightening the screw 7.

Therefore, in this embodiment, as in the previous embodiment, when the screen 1 is mounted on the frame 4, the positioning projection 9 is inserted through the large diameter portion 16 and the pressing member 5 is slid. The mounting portion 8 can be easily positioned. Further, when the screen 1 is first attached to the frame 4, the screws 7 need only be fastened to the end without stopping in the middle.
No extra work is required, and the installation work is simplified. Further, when the screen 1 is replaced, the holding member 5 can be removed and attached only by loosening the screw 7 attached to the attaching portion 8.

[0023]

As described above, according to the present invention, the positioning of the mounting portion can be easily performed only by inserting the positioning projection into the positioning long hole and sliding the holding member. In addition, when the screen is first mounted on the frame, the screw may be fastened to the mounting portion located in the mounting long hole without being stopped halfway, so that the screw is first used as in the related art. Can be eliminated halfway, and then the screw is tightened all the way. Further, when replacing the screen, the holding member can be removed simply by loosening the screw attached to the attachment portion, and it is possible to prevent the screw from being dropped and damaging the screen surface.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a frame and a screen according to a first embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are perspective views illustrating an operation of attaching a pressing member when attaching a screen.

FIGS. 3 (a) and 3 (b) are plan views for explaining an operation of attaching a pressing member when attaching a screen.

FIGS. 4A, 4B, and 4C are perspective views illustrating an operation of attaching a pressing member at the time of screen replacement.

FIG. 5 is an exploded perspective view showing a frame and a holding member according to a second embodiment of the present invention.

FIGS. 6A and 6B are perspective views illustrating an operation of attaching a pressing member when attaching a screen.

FIGS. 7 (a) and 7 (b) are plan views for explaining a mounting operation of a pressing member when mounting a screen.

FIGS. 8A, 8B, and 8C are perspective views illustrating an operation of attaching a pressing member at the time of screen replacement.

FIG. 9 is a schematic plan view illustrating a projection television according to a conventional example.

FIG. 10 is a side view of a main part showing a screen structure.

FIGS. 11 (a) and 11 (b) are perspective views illustrating an operation of attaching a pressing member when attaching a screen.

FIGS. 12A and 12B are perspective views illustrating an operation of attaching a pressing member when attaching a screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen 4 Frame frame 5 Holding member 6 Female screw 7 Screw 8 Mounting part 9 Positioning projection 12, 14 Mounting long hole 12A, 16 Large diameter part 12B, 17 Small diameter part 15 Positioning long hole

Continuation of the front page (56) References JP-A-5-176266 (JP, A) JP-A-59-72435 (JP, A) JP-A-6-40054 (JP, A) JP-A-50-621 (JP) , A) Japanese Utility Model 4-42639 (JP, U) Japanese Utility Model 59-194744 (JP, U) Japanese Utility Model 5-4149 (JP, U) Japanese Utility Model 3-123010 (JP, U) Japanese Utility Model 59-134695 (JP, U) Actually open 1986-193623 (JP, U) Actually open 1987-178250 (JP, U) Actually open, 64-10447 (JP, U) Actually open, 2-134155 (JP, U) U) Japanese Utility Model Application Hei 3-94182 (JP, U) Japanese Utility Model Application Utility Model 3-107287 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 21/56 H04N 5/74

Claims (4)

(57) [Claims] 1. A screen mounting structure for a projection television, wherein a periphery of a screen is sandwiched between a frame and a pressing member extending along the periphery, and the screen is mounted by being tightened with screws. A column-shaped mounting portion and a positioning protrusion are provided at intervals in the longitudinal direction of the pressing member to be provided, and a mounting long hole and a positioning are formed at a position of the pressing member corresponding to the column-shaped mounting portion and the positioning protrusion. Forming a female screw to be screwed to the screw in the columnar mounting portion; a large-diameter portion having a size large enough to allow the head of the screw to pass through the mounting long hole; A small diameter portion communicating with the diameter portion and extending in the longitudinal direction of the holding member with a width that allows the body portion of the screw to be inserted, and the positioning long hole having a width that allows the positioning projection to be inserted. The column-shaped mounting portion is formed below the large-diameter portion of the mounting long hole with the positioning protrusion inserted through the positioning long hole. A projection television, wherein the female screw of the columnar mounting portion is formed below the small-diameter portion in a state where the positioning projection is positioned at an end of the positioning long hole. Screen mounting structure. 2. The screen mounting structure for a projection television according to claim 1, wherein the positioning slot is formed in the same shape as the mounting slot. 3. The screen mounting structure for a projection television according to claim 1, wherein the large-diameter portion is formed to extend in a longitudinal direction of the pressing member, and the mounting long hole also serves as the positioning long hole. 4. The screen mounting structure for a projection television according to claim 3, wherein said columnar mounting portion and said positioning projection are connected by a wall portion.