JP2001075178A - Mounting frame for projection screen - Google Patents

Abstract

(57) [Problem] To provide a projection mounting frame that does not cause lifting on a screen. SOLUTION: The mounting frame for a projection screen of the present invention is a mounting frame for a screen having at least a Fresnel lens and a lenticular lens and having a vertically curved shape. 111, 112, and that the concave groove has a curve along the curved shape of the screen, and that the maximum curved length of the screen matches the maximum displacement B1 of the concave groove in the direction perpendicular to the screen surface. Features. In addition, the concave groove may be provided at a portion of the side plate that is in contact with the concave curved surface of the screen, and a line connecting the vertices of the convex portion may have a continuous shape along the curved concave curved surface shape of the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a screen mounting frame. More specifically, the present invention relates to a mounting frame for a projection screen having a Fresnel lens and a lenticular lens, and more particularly to a mounting frame for preventing the screen from floating.

[0002]

2. Description of the Related Art A projection screen is provided with a Fresnel lens and a lenticular lens, and these are superimposed, closely integrated, and held on a mounting frame for use. A conventional example of using this screen will be described below. FIG. 5 is a diagram showing an example of use of the projection screen. The display screen of the CRT 21 of the television monitor is reflected by the mirror 23 through the lens 22 and the screen 1 is displayed.
Projection televisions that project by magnifying to zero have been put to practical use.

[0005] In FIG. 5, a Fresnel lens 101 on the incident light side of a screen 10 forms an enlarged light on a CRT display screen enlarged by a lens into a parallel light on an image forming plane determined by a lens magnification. It has the function of forming an image, and is made of, for example, acrylic or polycarbonate, and has a screen screen size of 40.
In the case of ５０50 inches, the thickness is about 1.0 mm to 2.0 mm. On the other hand, the lenticular lens 102 has a function of diffusing the parallel light transmitted through the Fresnel lens 101 in order to widen the viewing angle of the imaging screen, and is made of, for example, acrylic, as a material.
When the size of the screen is 40 to 50 inches, the thickness is about 0.5 mm to 1.5 mm. When the floating occurs between the Fresnel lens and the lenticular lens, the image is blurred or the appearance is deteriorated. For this reason, conventionally, the lens is warped and held so as to prevent the lens from floating. However, since the screen mounting part of the conventional mounting frame is a linear mechanism frame, a curved screen is mounted on the linear screen mounting part, so that when the external temperature and humidity change, the screen plate supports the outer periphery The screen plate having the lower strength abutted against the frame to be deformed, resulting in a gap or distortion, and the floating was likely to occur on both sides and the center. When the floating occurs, it means that the image is blurred and the appearance is deteriorated.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention improves the floating of a lenticular lens by bringing a lenticular lens into close contact with a Fresnel lens by maintaining a warpage of a screen by forming a concave groove in a screen mounting portion of a mounting frame. What you want to do.

[0005]

Means for Solving the Problems A first aspect of the present invention for solving the above-mentioned problems is a screen mounting frame comprising at least a Fresnel lens and a lenticular lens and having a vertically curved shape, Along with the screen mounting concave groove on the side plate, the concave groove has a curve along the curved shape of the screen, the maximum curved length of the screen and the maximum displacement amount of the concave groove in the direction orthogonal to the screen surface. Are the same as the projection screen mounting frame. The mounting frame does not cause the screen to float.

The maximum displacement B (mm) of the groove in the direction perpendicular to the screen surface is within the range expressed by 0 <B ≦ 0.2A with respect to the screen diagonal size A (inch). This is preferable for maintaining an appropriate displacement amount.

A second aspect of the present invention for solving the above-mentioned problem is a screen mounting frame having at least a Fresnel lens and a lenticular lens and having a vertically curved shape. Along with a portion of the side plate that is in contact with the concave surface of the screen, a curve connecting the vertices of the projection has a continuous shape along the curved concave surface of the screen, and connects the maximum curve length of the screen and the apex of the projection. The projection screen mounting frame is characterized in that the curve has a maximum displacement in a direction perpendicular to the screen surface. The mounting frame does not cause the screen to float.

The maximum displacement B (mm) in the direction perpendicular to the screen surface of the curve connecting the vertices of the projections is 0 <B ≦ 0.2 A with respect to the screen diagonal size A (inch).
It is preferable that the distance be within the range represented by the following expression in order to maintain an appropriate amount of displacement.

In the projection screen mounting frame, the screen includes a Fresnel lens, a lenticular lens, and fixing means for fixing the Fresnel lens and the lenticular lens, and the total thickness of the screen is equal to the width of the groove for the screen mounting portion. It is more preferable that the thickness is smaller than 0.1 mm to 2.0 mm because the projection screen does not float.

[0010]

FIG. 1 is a schematic view showing a first embodiment of a mounting frame for a projection screen according to the present invention. FIG. 1A is a perspective view, and FIG. 1B is a front view of the side plate 111. In the embodiment of FIG. 1, curved grooves 111 d and 112 d are provided in left and right side plates 111 and 112 of the mounting frame 11. Mounting frame 1
A groove 113d is also provided on the lower plate 113 of the first,
This groove does not need to be curved and is a straight groove. FIG.
In (A), the upper surface plate 114 is illustrated as being separated upward, but after the screen is loaded, the upper surface plate 114 is used by being fixed to a mounting frame in a state of being covered with a lid. Therefore, the upper surface plate 114 has a linear groove 114 d similarly to the lower surface plate 113.
Is provided. These grooves can be provided as molded plastic members or can be manufactured by processing metal materials. The depth of each groove only needs to be sufficient to fix the projection screen, and is usually 5 m.
m to a depth of about 15 mm.

In FIG. 1 (B), L1 indicates the width of the groove for mounting the screen. Normally, the total thickness of the screen including the Fresnel lens, the lenticular lens テ ー プ, and the tape as the fixing means at both ends thereof is It is thinner than the width of the screen mounting groove, and the difference is 0.1 mm to 2.
It is preferably 0 mm. If the difference is 0.1 mm or less, there is no room between the groove and the screen with respect to the expansion and contraction of the screen due to a change in environment, and the screen is distorted. Further, when the difference is 2.0 mm or more, the screen approaches the free end face, so that the amount of depression increases. Therefore, the difference between the total screen thickness and the width of the concave groove is defined as described above. The width of the concave groove may be the same as the total length of the curved groove and the width of the lower plate and the upper plate.

Here, the displacement at the deepest position where the groove is curved is defined as the maximum displacement B1 of the groove. It is preferable that the maximum displacement amount B1 matches the maximum bending length of the screen. Here, the maximum curved length of the screen can be defined as the depth from a line connecting both ends of the screen at the center when the completed screen is set without applying stress. Although it depends on the diagonal size of the screen, the maximum displacement amount B1 (mm) is usually a value exceeding 0 with respect to the screen diagonal size A (inch), and is preferably 0.2 A or less. . That is, to explain in detail, the screen diagonal size A (inch) is multiplied by 25.4 mm
It is preferable that the value is not more than a value obtained by converting the value into units and dividing the value by 25.4 and multiplying by 0.2. Therefore, when the diagonal sizes A are 50 ", 60", and 70 ", the maximum displacement amounts are 10 mm, 12 mm, and 14 mm, respectively.
If A exceeds A, the focus adjustment becomes difficult if the depth of focus exceeds the depth of focus of the CRT, and the curvature becomes so large that it is not suitable for viewing the screen. The maximum curve length also depends on the diagonal size of the screen, but is usually about 5 mm to 15 mm.

FIG. 2 is a perspective view showing a state where the screen is set on the mounting frame. When setting the screen 10, as shown in FIG. 3, the upper and lower ends of the screen are fixed by fixing means 103 and 104 such as tapes, and the screen is inserted into the concave grooves by inserting from the upper ends of the grooves 111d and 112d of the side plates. Is inserted. After inserting the screen, the top plate 114 is covered and fixed. The screen loaded in such a mounting frame can prevent the occurrence of floating by maintaining the warpage of the screen so that the lenticular lens is in close contact with the Fresnel lens. Further, even if the indoor environment changes and the screen expands and contracts, a large stress is not applied to the screen, so that there is no adverse effect such as floating.

FIG. 4 is a schematic view showing a second embodiment of the mounting frame for a projection screen according to the present invention. FIG. 4A is a perspective view, and FIG.
1 is a front view of FIG. In the embodiment of FIG.
The left and right side plates 121, 122 have a projection 12P, and a line connecting the apexes of the projection has a curved series 121p, 122p along the curved concave surface of the screen. The projection is not provided on the side along the convex curved surface opposite to the concave curved surface of the screen, and the screen is a groove surface formed by molding or the like as in the first embodiment.

The groove 12 is also provided on the lower plate 123 of the mounting frame 12.
Although 3d is provided, this groove does not need to be curved and is a straight groove as in the case of the first embodiment. In this case as well, the upper surface plate 124 is illustrated as being separated upward, but after the screen 10 is set, it is used by being fixed to the mounting frame in a state of being covered with a lid. Therefore, a linear groove 124d is provided on the upper surface plate 124 similarly to the lower surface plate 123. The depth of each of the grooves only needs to be sufficient to fix the projection screen, and is set to the same depth as in the first embodiment.

In FIG. 4B, L2 indicates the width of the groove for mounting the screen. As in the first embodiment, the total thickness of the screen is smaller than the width of the groove for mounting the screen. Is preferably 0.1 mm to 2.0 mm. The width of the groove may be the same as the total length of the curved groove and the width of the lower plate and the upper plate. The amount of displacement at the deepest position of the curves 121p and 122p connecting the vertices of the protrusion can be defined as the maximum displacement B2 (mm) of the recess. It is preferable that the maximum displacement amount B2 matches the maximum bending length of the screen. It is preferable that the maximum displacement (mm) of the concave portion is 0.2 A or less with respect to the screen diagonal size A (inch).
This is because if it exceeds 0.2 A, a problem of the depth of focus or the like occurs as in the first embodiment.

In the second embodiment, the screen 10 is set on the mounting frame in the same manner as in the first embodiment. FIG. 3 shows a form of a general screen, in which a Fresnel lens 101 and a lenticular lens 102 having a slightly larger curvature are combined. The Fresnel lens emits light by converting the light source light into parallel light, and the lenticular lens diffuses the light source light in the horizontal direction. When observing an image, it is seen from the lenticular lens side. As shown in the figure, the upper and lower ends of the screen are fixed with fixing means 10 such as acetate tape.
It is fixed at 3,104 or the like so that no displacement occurs between the lenticular lens and the Fresnel lens. The screen is set on the mounting frame 12 by forming curved curved grooves 121p, 121c, and 122 formed by a series of projections of the side plates 121 and 122 and a surface facing the projections.
The screen is inserted into the groove so as to be inserted from the upper end between p and 122c. After the screen is inserted, the top plate 124 is covered and fixed as shown in FIG.

The number of projections provided on the side plate may be such that the line connecting the tops of the projections forms a substantially gently curved curved line, and is 1 to 5 cm with respect to the concave curved surface of the screen. It is sufficient to provide a number such that the protrusions come into contact with each other at such intervals. The size of each protrusion is, for example, a diameter of 2 to 10 mm when the cross section is a circular protrusion.
The shape may be such that the top is hemispherical. The projections may be provided in a plurality of rows or in scattered points. Such a mounting frame is made of a metal material such as iron, aluminum, stainless steel, etc.
A BS resin, a polypropylene resin, a nylon resin, an acrylic resin, a vinyl chloride resin, a hard rubber, or the like can be used, and a frame made of a metal material provided with a projection made of the above plastic material may be used.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. (Example 1) The mounting frame of the first embodiment as shown in FIG.
For the mounting frame, an aluminum material was used for sheet metal processing. The screen 10 was a combination of a Fresnel lens and a lenticular lens, and the Fresnel lens was an acrylic resin. A lenticular lens having a thickness of 2 mm and a lenticular lens having a thickness of 1 mm similarly using acrylic resin were used, and both ends of the combination of the lens sheets were fixed with acetate tape. The thickness of each part was 3.4 mm, so the width of the concave grooves 111d and 112d of the screen mounting frame was set to be 3.9 mm wider than this thickness by 0.5 mm. The length was 8 mm for a diagonal size of 50 ″, 10 mm for a 60 ″ diagonal size, and 13 mm for a 70 ″ diagonal size. In the maximum displacement amount of each attachment frame B1
However, the shape of the groove was formed so that each had the same numerical value as the maximum bending length.

The 50 ", 60", and 70 "screens are inserted into the concave grooves of the mounting frame manufactured as described above, and the upper surface plate is fixed. The screen was left in a constant humidity chamber for one week, and then left at room temperature for one week to check the behavior of the screen due to environmental changes. As a result, no lifting occurred on any of the screens.

(Example 2) A mounting frame according to a second embodiment as shown in FIG.
These were prepared for 60 "and 70", respectively. The mounting frame member was manufactured by molding a polypropylene resin, and the side of the concave groove in contact with the convex curved surface of the screen had a curved curve 121c similar to that of the first embodiment. The other surface has a structure in which protrusions having a diameter of 5 mm are arranged at intervals of 20 mm on a linear groove surface, and a line connecting the tops is a curved continuous line.
1p.

The screen 10 is made of a combination of a Fresnel lens and a lenticular lens, and the Fresnel lens is made of acrylic resin to a thickness of 2 mm, and the lenticular lens is made of acrylic resin. One manufactured to a thickness of 1 mm was used. When the ends of the combination of both lens sheets were fixed with acetate tape, the thickness of both ends was 3.4 mm. Therefore, the width L2 of the concave groove formed by the curve of the screen mounting frame and 121p and 121c is set to be 3.9 mm so as to be 0.5 mm wider than this thickness. Note that the maximum bending length of the screen is diagonal size 5
8 "for 0", 10mm for 60 ", 70"
Was 13 mm, the grooves were formed such that the maximum displacement B2 of each mounting frame had the same numerical value as the maximum bending length.

Each of the 50 ", 60", and 70 "screens is inserted into the groove of the mounting frame manufactured as described above, and the upper plate is fixed. The screen was left in a constant humidity chamber for one week, and then left at room temperature for one week to check the behavior of the screen due to environmental changes. As a result, no lifting occurred on any of the screens.

(Comparative Example) As a comparative example, a mounting frame having a linear concave groove was screen diagonal size 50 ″, 6
These were prepared for 0 "and 70", respectively. In the mounting frame,
Aluminum plate material was used after sheet metal processing. Screen 10
Used a combination of a Fresnel lens and a lenticular lens, and manufactured a 2 mm thick Fresnel lens using acrylic resin and a 1 mm thick lenticular lens using the same acrylic resin What was used was used. When the ends of the combination of both lens sheets were fixed with acetate tape, the thickness of both ends was 3.4 mm. Therefore, the width of the groove of the screen mounting frame should be 0.5
mm so as to be 3.9 mm. The maximum curved length of the screen is 8m for a 50 "diagonal size.
m, 10 "for 60", 13mm for 70 "
Met.

Each of the 50 ", 60" and 70 "screens is inserted into the groove of the mounting frame thus manufactured, and the upper plate is fixed. When left in a constant humidity room for one week and then left at room temperature for one week to check the behavior of the screen due to changes in the environment, each floated an average of about 10 mm. When the image was projected, it was blurred and the image quality deteriorated. Was observed.

[0026]

According to the projection screen mounting frame of the present invention, the concave groove into which the screen is inserted is formed in a curved shape in both the first and second embodiments. In addition, the lenticular lens is brought into close contact with the Fresnel lens to prevent the occurrence of floating. In addition, since the stress load applied to the screen itself during expansion and contraction in the use environment of the screen is small, the screen does not float.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of a projection screen mounting frame according to the present invention.

FIG. 2 is a perspective view showing a state where a screen is set on a mounting frame.

FIG. 3 is a diagram showing a form of a general screen.

FIG. 4 is a schematic view showing a second embodiment of a projection screen mounting frame according to the present invention.

FIG. 5 is a diagram illustrating an example of use of a projection screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Screen 11 Mounting frame 12 Mounting frame 12p Projection 21 CRT 22 Lens 23 Mirror 101 Fresnel lens 102 Lenticular lens 103, 104 Fixing means 111, 112, 121, 122 Side plate 111d, 112d Curved groove 121p, 122p Curved series 113, 123 Lower plate 114, 124 Upper plate 113d, 114d, 123d, 124d Groove

Claims (5)

[Claims] 1. A screen mounting frame comprising at least a Fresnel lens and a lenticular lens and having a vertically curved shape, comprising a screen mounting groove in a side plate, and the screen groove being curved. A projection screen mounting frame having a curve along the shape, wherein a maximum curved length of the screen matches a maximum displacement amount of the concave groove in a direction orthogonal to a screen surface. 2. The mounting frame for a projection screen according to claim 1, wherein the maximum displacement amount B (mm) of the concave groove in a direction perpendicular to the screen surface is larger than a screen diagonal size A (inch). A mounting frame for a projection screen, which is within a range represented by 0 <B ≦ 0.2A. 3. A screen mounting frame having at least a Fresnel lens and a lenticular lens and having a vertically curved shape, the screen mounting projection being provided at a portion in contact with the screen concave curved surface of the side plate. The curve connecting the vertices of the projections has a continuation along the curved concave curved surface shape of the screen, and the maximum curve length of the screen and the maximum displacement of the curve connecting the vertices of the projections in the direction orthogonal to the screen surface are different. A mounting frame for a projection screen, which is identical. 4. The mounting frame for a projection screen according to claim 3, wherein a maximum displacement amount B (m) in a direction orthogonal to a screen surface of a curve connecting vertexes of the projections.
m) is within a range represented by 0 <B ≦ 0.2A with respect to a screen diagonal size A (inch). 5. The mounting frame for a projection screen according to claim 1, wherein the screen comprises a Fresnel lens, a lenticular lens, and fixing means for fixing the Fresnel lens and the lenticular lens. The total thickness is smaller than the width of the screen mounting groove, and the difference is 0.1 mm to 2.0 m
m, a mounting frame for a projection screen.