JPH1164980A - Screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen making a picture look large by reducing a width of a screen fixing frame and securing strength of a screen press member. SOLUTION: In the screen 1 constituted so that a screen curtain 4 is held to the screen fixing frame 2 in the state of holding through the screen press member 3, a first boss 11 for fitting the screen press member 3 to the screen fixing frame 2 and a second boss 12 for fitting a mirror cover 5 are provided on line, and the screen press member 3 is formed in a U-shaped section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen such as a transmission screen used for a rear projection type liquid crystal projector or the like.

[0002]

2. Description of the Related 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 the internal structure thereof. The rear projection type liquid crystal projector 40 is provided with a projection type liquid crystal display device 71 capable of displaying an image by transmitting light from a light source to a liquid crystal cell in a cabinet 41,
It is formed so that the image light projected from the projection type liquid crystal display device 71 through the projection lens is reflected by the reflecting mirror 72 and enlarged and projected on the screen 50 on the front of the cabinet. The screen 50 is configured by holding a screen curtain 53 on a screen fixing frame 51, and the screen fixing frame 51 protects a mirror 72, in this case, a mirror cover 54 that also functions as a cabinet that is an external housing. It is integrated into.

FIG. 8 is an enlarged sectional view of a main part of the screen 50. The screen 50 has a Fresnel lens 53
F, a lenticular screen 53L, and a contrast screen 53C, including three screen curtains 53, a screen fixing frame 51, and a screen holder 52 that is a screen pressing member that holds the screen curtain 53 in the screen fixing frame 51 in a sandwiched manner.

The screen fixing frame 51 includes a frame-shaped front plate portion 51a and an outer plate portion 51b extending rearward from an outer peripheral edge thereof.
A first boss 61 for integrally fixing the screen holder 52 is provided protrudingly from the inner surface of the front plate portion 51a, and the screen fixing frame 51 is mirrored at a position outside the first boss 61. A second boss 62 for fixing to the cover 54 is provided to protrude. The second boss 62 is formed longer than the first boss 61. On the other hand, the screen holder 52 is
Is formed long along the side of, and has a shape in which one end of an inverted U-shape is bent outward at a right angle.

A Fresnel lens 53F, a lenticular screen 53L, a contrast screen 53
The screen curtain 53 composed of three sheets C is screwed to the inner surface of the front plate portion 51a of the screen fixing frame 51 and the first boss 61 protruding from the screen fixing frame 53 in a state of a predetermined tension. And is integrally held so as to be sandwiched between the screen holder 52 fixed by the above.
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 connected to the first of the screen fixing frame 51 by screws 55 through the screw insertion holes 56.
The screen 50 is attached to the front surface of the cabinet by screwing to a second boss 62 projecting from a position outside the boss 61 of the cabinet.

[0006]

SUMMARY OF THE INVENTION Screen fixing frame 51
Is usually formed in a black color, so that the screen curtain 5
3 is easily emphasized. Therefore, when the width W ₀ of the screen fixing frame 51 is large, the screen appears to be small due to the visual effect.

However, the conventional screen fixing frame 51 is
Since the first boss 61 in parallel and has a second boss 62, there is a limit to reduce the width W _0.

[0008] In order to solve the above-mentioned problems, the present invention provides a screen in which the screen can be seen large and the strength of the screen pressing member can be secured by reducing the width of the screen fixing frame.

[0009]

The screen of the present invention comprises:
The screen curtain is sandwiched and held by the screen fixing frame via a screen pressing member, and a first boss for mounting the screen pressing member on the screen fixing frame and a second boss for mounting the mirror cover are one. The screen pressing member is provided on a line and has a U-shaped cross section.

According to the configuration of the present invention described above, by providing the first boss and the second boss in a line, the width of the screen fixing frame can be reduced. In addition, by making the screen pressing member have a U-shaped cross section, it is possible to obtain a sufficient pressing length for pressing the screen, and at the same time, it is possible to sufficiently secure the strength of the pressing member.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen having a screen film held in a screen fixing frame via a screen pressing member, and a first boss for attaching the screen pressing member to the screen fixing frame. And a second boss for attaching the mirror cover is provided on a line, and the screen pressing member is formed in a U-shaped cross section.

The present invention also relates to the above screen,
The screen pressing member has a configuration having a hole through which the second boss passes.

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 a screen of the present invention.
FIG. 1B is a schematic sectional view showing the internal configuration thereof. The rear projection type liquid crystal projector 10 is capable of displaying an image by transmitting light from a light source to a liquid crystal cell in a cabinet 9 to display an image.
1 is arranged, and the image light projected from the projection type liquid crystal display device 21 through the projection lens is reflected by the mirror 22 for reflection, and is enlarged and projected on the screen 1 according to the present invention on the front surface of the cabinet. 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, as described later. 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.

In FIG. 1, the mirror cover 5
Covers the entire portion other than the screen fixing frame 2, but the housing around the projection type liquid crystal display device 21 located below the screen curtain 4 may be formed separately from the mirror cover 5. In addition, a configuration may be adopted in which dust is added to the front surface of the mirror 22 as necessary.

FIG. 2 is an overall view of the screen 1 as viewed from the back, FIG. 3 is an enlarged view of a part thereof, and FIGS. 4 and 4 are enlarged views of a cross section taken along line AA and a line BB. Each is shown in FIG. 4 and 5 are cross-sectional views showing a state where the screen 1 is attached to the mirror cover 5. The screen 1 is composed of three screen curtains 4 including a Fresnel lens 4F, a lenticular screen 4L, and a contrast screen 4C, a screen fixing frame 2, and a screen holder 3 for holding the screen curtain 4 between the screen fixing frames 2. .

The screen fixing frame 2 is a frame-shaped front plate 2
a and an outer plate portion 2b extending rearward from the outer peripheral edge thereof, and a female screw is formed on an inner surface of the front plate portion 2a at an upper end for fixing the screen holder 3 integrally therewith. A first boss 11 and a second boss 12 having a female thread at the upper end for fixing the screen fixing frame 2 to the mirror cover 5 are provided to protrude, respectively. 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 second bosses 12 are provided on the upper side and the left and right sides in the case of the drawing. Second boss 12
Are formed sufficiently longer than the first boss 11 (FIG. 4).
And FIG. 5).

Further, as shown in FIG. 5, the mirror cover 5 is provided with a screw insertion hole 7 at the end on the screen fixing frame 2 side, and the screen fixing frame 2 is inserted through the screw insertion hole 7. The second boss 12 is fixed by a screw 6.

As shown in FIG. 2, the screen holder 3 is divided into a plurality of parts with respect to the screen fixing frame 2 and formed to be long. As shown in FIGS. 3 to 6, the screen holder 3 is formed such that its cross section has a U shape, and the upper bent plate portion 3 b is longer than the lower bent plate portion 3 a.
The screen curtain 4 is configured to be pressed by the surface of the lower bent plate portion 3a. The upper bent plate portion 3b has a screw insertion hole 14 at a position corresponding to the first boss 11 on the edge side thereof.
Is formed, and a notch 13 through which the second boss 12 can be inserted is formed at a position corresponding to the second boss 12.

Here, the first boss 11 and the second boss 1
2 is formed on one line of the screen fixing frame 2, and as shown in FIGS.
In, the screw insertion hole for screwing the first boss 11 and the cutout portion 13 for passing the second boss 12 are formed in a line. The screen holder 3 is preferably made of metal or the like, and has high bending strength.

In the screen 1, after the screen curtain 4 is placed on the back surface of the screen fixing frame 2, that is, on the inner surface of the front plate portion 2a, the screen holder 3 is moved from above to the surface of the lower bent plate portion 3a. Are arranged so as to be in contact with the screen curtain 4, and as shown in FIG.
Is fixed to the first boss 11 of the screen fixing frame 2 with the screw 6, so that the screen curtain 4 is held between the screen fixing frame 2 and the screen holder 3. At this time, the second boss 12 penetrates the notch 13 of the screen holder 3 and protrudes. The screen holders 3 are arranged in a predetermined number of rows and columns, for example, as shown in FIG.

Further, 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 is screwed through the screw insertion hole 7 of the mirror cover 5. Mirror cover 5 and second boss 1
2 are screwed together to be integrally attached to the front surface of the cabinet 9.

According to the screen 1 described above, the width W ₁ of the screen fixing frame 2 can be reduced by forming the first boss 11 and the second boss 12 in a line. Therefore, when the screen 1 is viewed, the screen fixing frame 2 becomes inconspicuous, so that the screen can be seen large.

Also, by forming the screen holder 3 in a U-shaped cross section, as shown in FIG. 6, the distance d between the second boss cutout 13 and the bent position of the screen holder 3 is increased. _{Since 1} is secured to some extent, the strength of the screen holder 3 at this position against bending can be sufficiently secured.

Incidentally, as shown in FIG. 9, the first boss 3
Using a screen fixing frame 31 in which 3 and a second boss (not shown) are arranged in a line, a plate material similar to the conventional one is folded twice at a right angle as a screen holder 32, and its lower bent plate portion 32a is screened. It is also conceivable to configure the screen 30 by using the screen holder 32 having a stepped cross section provided with the upper bent plate portion 32b, the screw insertion hole 14, and the cut-out portion 13 as a holder for the curtain 4.

Also in this case, the width W of the screen fixing frame 31 is
₁ can be made smaller (W ₁ <W ₀ ) than the width W ₀ of the screen fixing frame 51 of the screen 50 shown in FIG. 6, and the screen can be made to look large.

However, in the configuration of the screen 30, as shown in FIG. 10, the shape of the screen holder 32 is such that the second boss is passed through the screen holder 32.
The distance d ₀ between the boss notch 13 and the bending position of the screen holder 32 is short, and the strength of the screen holder 32 in the vicinity of the notch 13 against bending cannot be sufficiently ensured.

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.

In the above embodiment, the liquid crystal projector 1 has the screen 1 having the internal configuration shown in FIG. 1B.
However, the present invention can be applied to projectors having other configurations. For example, a rear projection type projector having a configuration using a projection type display device using a cathode ray tube instead of the projection type liquid crystal display device 21, or a plurality of reflection mirrors arranged such that a reflection mirror is arranged below a screen curtain to form an optical path. The screen of the present invention can be similarly applied to a rear projection type projector or the like having a long configuration.

The screen of the present invention is not limited to the above-described example, and may have various other configurations without departing from the gist of the present invention.

[0030]

According to the above-described screen according to the present invention, the width of the screen fixing frame can be reduced by forming the first boss and the second boss in a line. Therefore, when the screen is viewed, the screen fixed frame becomes inconspicuous, so that the screen can be seen large.

Further, since the distance between the bent portion of the screen pressing member and the hole through which the second boss passes is ensured to some extent, the strength of the screen pressing member can also be ensured.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a liquid crystal projector including a screen of the present invention. 1 is a front view of a liquid crystal projector. FIG. 2B is a schematic sectional view showing the internal configuration of the liquid crystal projector.

FIG. 2 is a configuration diagram showing one embodiment of a screen according to the present invention as viewed from the back surface.

FIG. 3 is an enlarged view of a part of the screen of FIG. 2;

FIG. 4 is an enlarged sectional view taken on line AA of the screen of FIG. 2;

FIG. 5 is an enlarged cross-sectional view of the screen of FIG. 2 taken along line BB.

FIG. 6 is a perspective view showing a shape of a screen holder of the screen of FIG. 2;

FIG. 7 is a schematic configuration diagram of an example of a conventional liquid crystal projector having a screen. 1 is a front view of a liquid crystal projector. FIG. 2B is a schematic sectional view showing the internal configuration of the liquid crystal projector.

FIG. 8 is an enlarged sectional view of a main part of a conventional screen.

FIG. 9 is an enlarged sectional view of a main part of a screen of a comparative example.

FIG. 10 is a perspective view showing a shape of a screen holder used for the screen of 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 hole, 9 cabinet, 10 liquid crystal projector, 11 first boss, 12 second boss, 13
Missing portion (for second boss), 21 projection liquid crystal display, 22 mirror, 30, 50 screen, 31, 5
1 screen fixing frame, 32, 52 screen holder, 33, 61 first boss, 40 liquid crystal projector, 41 cabinet, 53 screen curtain, 53C
Contrast screen, 53L lenticular screen, 53F Fresnel lens, 54 mirror cover, 55 screw, 56 screw insertion hole, 62 second boss, 71 projection type liquid crystal display device, 72 mirror, W ₀ ,
W ₁ Screen fixed frame width

Claims (2)

[Claims] 1. A screen in which a screen curtain is sandwiched and held by a screen fixing frame via a screen holding member, a first boss for attaching the screen holding member to the screen fixing frame, and a mirror cover. A second boss for attaching the screen is provided on a line, and the screen pressing member is formed in a U-shaped cross section. 2. The screen holding member according to claim 2, wherein
The screen according to claim 1, further comprising a hole through which the boss passes.