JP3675118B2 - screen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen such as a transmissive screen used in, for example, a rear projection type liquid crystal projector.
[0002]
[Prior art]
FIG. 7A is a perspective view of a rear projection type liquid crystal projector provided with a conventional screen, and FIG. 7B is a schematic sectional view showing an internal configuration thereof.
In the rear projection type liquid crystal projector 40, a projection type liquid crystal display device 71 capable of displaying an image by transmitting light from a light source through a liquid crystal cell is disposed in a cabinet 41. The image light projected from the projector through the projection lens is reflected by a mirror 72 that reflects the image light, and is enlarged and projected onto the screen 50 on the front surface of the cabinet. The screen 50 is configured by holding a screen curtain 53 on a screen fixing frame 51, and this screen fixing frame 51 protects a mirror 72, in this case, a mirror cover 54 that also serves as a cabinet that is an external casing. Is integrated.
[0003]
FIG. 8 shows an enlarged cross-sectional view of the main part of the screen 50.
The screen 50 is a screen that is a screen pressing member that holds the screen curtain 53 sandwiched between the screen fixing frame 51 and the three screen screens 53 of the Fresnel lens 53F, the lenticular screen 53L, and the contrast screen 53C. And a holder 52.
[0004]
The screen fixing frame 51 is formed to have a frame-shaped front plate portion 51a and an outer plate portion 51b extending rearward from the outer peripheral edge thereof, and the screen holder 52 is integrally fixed to the inner surface of the front plate portion 51a. A first boss 61 for projecting is provided so as to project, and a second boss 62 for projecting the screen fixing frame 51 to the mirror cover 54 is provided so as to project at a position outside thereof. The second boss 62 is formed longer than the first boss 61.
On the other hand, the screen holder 52 is formed in a long shape along the side of the screen fixing frame 51, and has a cross-sectional shape in which one end of an inverted U-shape is bent outward at a right angle.
[0005]
The screen curtain 53 composed of the Fresnel lens 53F, the lenticular screen 53L, and the contrast screen 53C is in a predetermined tension state, together with the inner surface of the front plate portion 51a of the screen fixing frame 51 and the screen fixing frame. The first boss 61 protruding from 53 is held integrally with the screen holder 52 fixed with screws 55. At this time, the screen curtain 53 is pressed by the bent front end surface 52 a of the screen holder 52.
Further, the mirror cover 54 is screwed to the second boss 62 protruding from the position outside the position of the first boss 61 of the screen fixing frame 51 by the screw 55 through the screw insertion hole 56, and the screen 50. Is attached to the front of the cabinet.
[0006]
[Problems to be solved by the invention]
Since the screen fixing frame 51 is usually formed in a black color, it is easy to emphasize the screen made up of the screen curtain 53.
Therefore, when the width W ₀ of the screen fixing frame 51 is large, the screen looks small due to the visual effect.
[0007]
However, since the conventional screen fixing frame 51 has the first boss 61 and the second boss 62 that are juxtaposed, there is a limit to reducing the width W ₀ thereof.
[0008]
In order to solve the above-described problems, the present invention provides a screen in which the screen can be enlarged and the strength of the screen pressing member can be secured by reducing the width of the screen fixing frame.
[0009]
[Means for Solving the Problems]
The screen of the present invention includes a screen curtain that is sandwiched and held by a screen fixing frame via a screen pressing member, and is engaged with a plurality of first bosses for attaching the screen pressing member to the screen fixing frame and the screen. A second boss for attaching the mirror cover is provided on one line, and the screen pressing member is formed in a U-shaped cross section.
[0010]
According to the configuration of the present invention described above, the width of the screen fixing frame can be reduced by providing a plurality of first bosses and second bosses on one line.
Moreover, by making the screen pressing member U-shaped in cross section, it is possible to obtain a length of a pressing margin sufficient to press the screen, and at the same time, it is possible to ensure sufficient strength of the pressing member.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a screen in which a screen film is sandwiched and held by a screen fixing frame via a screen pressing member, a plurality of first bosses for attaching the screen pressing member to the screen fixing frame, and the screen. A second boss for attaching a mating mirror cover is provided on one line, and the screen pressing member is formed in a U-shaped cross section.
[0012]
According to the present invention, in the screen, the screen pressing member has a notch portion through which the second boss is inserted .
[0013]
Hereinafter, an embodiment of the screen of the present invention will be described with reference to the drawings.
FIG. 1A is a perspective view of a rear projection type liquid crystal projector provided with the screen of the present invention, and FIG. 1B is a schematic cross-sectional view showing an internal configuration thereof.
The rear projection type liquid crystal projector 10 includes a projection type liquid crystal display device 21 capable of displaying an image by transmitting light from a light source through a liquid crystal cell in a cabinet 9. The image light projected through the projection lens is reflected by the reflecting mirror 22 and is enlarged and projected onto the screen 1 according to the present invention on the front surface of the cabinet. As will be described later, the screen 1 is configured by holding a screen curtain 4 on a screen fixing frame 2 via a screen holder 3 which is a screen pressing member. The screen fixing frame 2 is integrated with a mirror cover that protects the mirror 22, in this case, a mirror cover 5 that also serves as a cabinet 9 that is an external housing.
[0014]
In FIG. 1, the mirror cover 5 covers the entire portion other than the screen fixing frame 2. However, the casing around the projection type liquid crystal display device 21 located below the screen curtain 4 is mirror cover. 5 and a separate body.
Moreover, it is good also as a structure which adds dust prevention to the front surface of the mirror 22 as needed.
[0015]
FIG. 2 is an overall view of the screen 1 as seen from the back, FIG. 3 is an enlarged view of a part thereof, and FIGS. 4 and 5 are enlarged views of the cross section on the line AA and the cross section on the line BB. Each is shown. 4 and 5 are sectional views showing a state in which the screen 1 is attached to the mirror cover 5. FIG.
The screen 1 includes three screen curtains 4 of a Fresnel lens 4F, a lenticular screen 4L, and a contrast screen 4C, a screen fixing frame 2, and a screen holder 3 that holds the screen curtain 4 sandwiched between the screen fixing frames 2. .
[0016]
The screen fixing frame 2 is formed to have a frame-shaped front plate portion 2a and an outer plate portion 2b extending rearward from the outer peripheral edge thereof. The screen holder 3 is integrally formed on the inner surface of the front plate portion 2a. A first boss 11 having a female screw cut at the upper end for fixing and a second boss 12 having a female screw cut at the upper end for fixing the screen fixing frame 2 to the mirror cover 5 are provided to protrude. It is done. In particular, as shown in FIG. 2, the first boss 11 and the second boss 12 are formed on a line along the side of the screen fixing frame 2. A plurality of first bosses 11 are provided on each of the four sides of the screen fixing frame 2, and the second boss 12 is provided on each of the upper side and the left and right sides in the illustrated case. The second boss 12 is formed sufficiently longer than the first boss 11 (see FIGS. 4 and 5).
[0017]
Further, as shown in FIG. 5, the mirror cover 5 is provided with a screw insertion hole 7 at an end portion thereof on the screen fixing frame 2 side, and the second of the screen fixing frame 2 is passed through the screw insertion hole 7. The boss 12 is fixed with a screw 6.
[0018]
As shown in FIG. 2, the screen holder 3 is divided into a plurality of pieces with respect to the screen fixing frame 2 and is formed in a long shape.
As shown in FIGS. 3 to 6, the screen holder 3 has a U-shaped cross section, and the U-shaped upper bent plate portion 3b is longer than the lower bent plate portion 3a. The screen curtain 4 is configured to be pressed by the surface of the lower bent plate portion 3a. A screw insertion hole 14 is formed at a position corresponding to the first boss 11 on the edge side of the upper bent plate portion 3 b, and the second boss 12 is inserted at a position corresponding to the second boss 12. The resulting missing portion 13 is formed.
[0019]
Here, since the first boss 11 and the second boss 12 are formed on one line of the screen fixing frame 2, as shown in FIGS. 3 and 6, the first boss 11 in the screen holder 3 is used. The screw insertion hole 14 for screwing the first boss 12 and the notch 13 through which the second boss 12 is passed are formed on one line.
The screen holder 3 is preferably made of metal or the like, and has high strength against bending.
[0020]
In this screen 1, after the screen curtain 4 is placed on the back surface of the screen fixing frame 2, that is, the inner surface of the front plate portion 2 a, the screen holder 3 is placed on the screen folding screen 3 a from above. 4, and the screen holder 4 is fixed to the first boss 11 of the screen fixing frame 2 with screws 6 as shown in FIG. 4, so that the screen curtain 4 is attached to the screen fixing frame 2 and the screen holder 3. It is made to hold in a sandwiched manner.
At this time, the second boss 12 is projected through the notch 13 of the screen holder 3.
For example, as shown in FIG. 2, a predetermined number of screen holders 3 are arranged with the screen holder 3 sandwiching the screen curtain 4 between the back surface of the screen fixing frame 2.
[0021]
Furthermore, as shown in FIG. 5, the screen 1 has the second boss 12 of the screen fixing frame 2 abutted against the mirror cover 5, and the mirror cover 5 by the screw 6 through the screw insertion hole 7 of the mirror cover 5. And the second boss 12 are fixed to the front surface of the cabinet 9 by screwing.
[0022]
According to the above-described screen 1, the width W ₁ of the screen fixing frame 2 can be reduced by forming the first boss 11 and the second boss 12 on one line.
Therefore, when the screen 1 is viewed, the screen fixing frame 2 becomes inconspicuous, so that the screen appears larger.
[0023]
Further, by forming the screen holder 3 with a U-shaped cross section, as shown in FIG. 6, a distance d ₁ between the second boss removal portion 13 and the bending position of the screen holder 3 is set to some extent. Therefore, the strength against bending of the screen holder 3 at this position can be sufficiently secured.
[0024]
Incidentally, as shown in FIG. 9, a screen fixing frame 31 in which a first boss 33 and a second boss (not shown) are arranged on one line is used, and a plate material similar to the conventional one is used twice as a screen holder 32. The screen 30 is folded using a screen holder 32 having a stepped cross section provided with the upper bent plate portion 32b, the screw insertion hole 14 and the notch portion 13 as a holding of the screen curtain 4 by folding back at a right angle. It is also possible to construct
[0025]
Also in this case, the width W ₁ of the screen fixing frame 31 can be made smaller than the width W ₀ of the screen fixing frame 51 of the screen 50 shown in FIG. 6 (W ₁ <W ₀ ) so that the screen looks larger. can do.
[0026]
However, in the configuration of the screen 30, as shown in FIG. 10, the second boss notch 13 that passes the second boss through the screen holder 32 and the folding position of the screen holder 32. The distance d ₀ between the screen holder 32 and the screen holder 32 is not sufficiently strong in the vicinity of the notch 13.
[0027]
On the other hand, in the present embodiment, as described above, the width W ₁ of the screen fixing frame 2 can be reduced, and at the same time, the strength of the screen holder 3 can be secured.
[0028]
In the above-described embodiment, the screen 1 is applied to the liquid crystal projector 10 having the internal configuration shown in FIG. 1B. However, the screen 1 can also be applied to projectors having other configurations.
For example, a rear projection projector having a configuration using a projection display device using a cathode ray tube instead of the projection liquid crystal display device 21 or a plurality of reflection mirrors such as a reflection mirror arranged under the screen curtain is used to arrange the optical path. The screen of the present invention can be similarly applied to a rear projection projector having a long configuration.
[0029]
The screen of the present invention is not limited to the above-described example, and various other configurations can be taken without departing from the gist of the present invention.
[0030]
【The invention's effect】
According to the above-described screen according to the present invention, the width of the screen fixing frame can be reduced by forming a plurality of first bosses and second bosses on one line.
Accordingly, when the screen is viewed, the screen fixing frame becomes inconspicuous, so that the screen appears larger.
[0031]
In addition, since the distance between the bent portion of the screen pressing member and the notched portion through which the second boss is inserted is secured to some extent, the strength of the screen pressing member can also be secured.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a liquid crystal projector provided with a screen of the present invention.
It is a front view of A liquid crystal projector.
It is a schematic sectional drawing which shows the internal structure of B liquid crystal projector.
FIG. 2 is a configuration diagram seen from the back side showing an embodiment of the screen of the present invention.
FIG. 3 is an enlarged view of a part of the screen of FIG. 2;
4 is an enlarged cross-sectional view taken along line AA of the screen of FIG.
5 is an enlarged cross-sectional view of the screen of FIG. 2 along the line BB.
6 is a perspective view showing a shape of a screen holder of the screen of FIG. 2. FIG.
FIG. 7 is a schematic configuration diagram of an example of a liquid crystal projector provided with a conventional screen.
It is a front view of A liquid crystal projector.
It is a schematic sectional drawing which shows the internal structure of B liquid crystal projector.
FIG. 8 is an enlarged cross-sectional view of a main part of a conventional screen.
FIG. 9 is an enlarged cross-sectional view of a main part of a screen of a comparative example.
10 is a perspective view showing the shape of a screen holder used for the screen of FIG. 9. FIG.
[Explanation of symbols]
1 screen, 2 screen fixing frame, 3 screen holder, 4 screen curtain, 4C contrast screen, 4L lenticular screen, 4F Fresnel lens, 5 mirror cover, 6 screws, 7, 14 screw insertion holes, 9 cabinet, 10 LCD projector, 11 First boss, 12 Second boss, 13 Absence part (for second boss), 21 Projection type liquid crystal display device, 22 Mirror, 30, 50 screen, 31, 51 Screen fixing frame, 32, 52 screen Holder, 33, 61 1st boss, 40 LCD projector, 41 cabinet, 53 screen curtain, 53C contrast screen, 53L lenticular screen, 53F Fresnel lens, 54 mirror cover, 55 screws, 56 screw insertion holes, 62 2nd boss 71 Projection type liquid Crystal display, 72 mirrors, W ₀ , W ₁ screen fixed frame width

Claims (2)

In a screen in which a screen curtain is held by a screen fixing frame via a screen pressing member,
A plurality of first bosses for attaching the screen pressing member to the screen fixing frame and a second boss for attaching a mirror cover that engages with the screen are provided on one line.
A screen characterized in that the screen pressing member is formed in a U-shaped cross section. The screen according to claim 1, wherein the screen pressing member includes a notch portion through which the second boss is inserted .

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