JPH03282442A - Projecting screen attaching device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the image display performance when a screen is extended/contracted by arranging engaging rod bodies along at least the two arms of the screen and imparting tensile force to the screen engaged with the engaging rod bodies. CONSTITUTION:Sleeve like engaging members 4a - 4d are attached to the four arms of the screen 2 along the longitudinal directions of the arms and sewed up thereto. Rod bodies 6a - 6d are inserted through the engaging members 4a - 4d, extended along the arms of the screen 2 and connected with each other to be fixed at right angles, whereby a lectangular frame body is formed. Moreover, the rod bodies 6a - 6d are provided with pressurized coil springs 8a - 8d in their center parts so as to be extensive/contractive in their longitudinal directions with these spring parts. Thus, the flatness of the screen can be maintained and its image display performance can be prevented from deteriorating when the screen is extended/contracted in responce to change in an environmental condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device for mounting a projection screen, and particularly relates to a device for mounting a projection screen.
The present invention relates to a device for expanding and attaching a projection screen (referred to as a "sheet-like" projection screen in this specification) into a flat shape.

The device of the present invention is effectively used as a transmissive or reflective screen for a display screen such as a projection television or an overhead projector.

[Prior Art and Problems to be Solved by the Invention] Recently, projection screens having lenticular lenses or Fresnel lenses as constituent elements have been used in order to obtain desired image display performance. Recently, especially for the purpose of improving resolution, there has been a demand for smaller lenticular lens pitches and smaller Fresnel lens pitches, and for thinner screens themselves.

Since such a thin screen has low rigidity, a means for supporting the outer periphery is required to maintain a predetermined planar shape.

Conventionally, this shape maintaining means has been proposed, for example, by arranging a rigid frame around the frame and connecting the four corners of the frame to the four corners of a sheet-like screen with tension springs (Utility Model No. 59-1999).
121646), and a method in which the two and/or four opposing sides of the frame and the two and/or four opposing sides of the sheet-like screen are connected using a spring or the like having a tensile force (Utility Model No. 121646). -154940 Publication, Utility Model Application No. 61-1123
No. 29, No. 61-112330, No. 112331, No. 69229, No. 93885, No. 1176
No. 34) has been proposed.

Alternatively, for example, a rigid frame may be arranged around the frame, the outer periphery of the sheet-like screen may be fixed to the frame, and the sheet surface near the outer periphery of the screen may be elastically pressed from a direction perpendicular to the sheet surface using a pressing member. Method of applying pressing force (Unexamined Japanese Patent Publication No. 1-3
02338) has also been proposed.

However, in the method of pulling the four corners of the screen, the side portions of the screen are likely to deform, and the image display performance near the outer periphery is likely to deteriorate.

In addition, with the method of pulling the sides of the screen, if the screen expands or contracts due to changes in the surrounding environmental conditions, since the frame is a rigid body, the direction of the pulling force from the springs etc. will change, causing distortion on the screen. This tends to cause image display performance to deteriorate.

In addition, even with the method of elastically applying pressing force from the direction perpendicular to the sheet surface using the presser member, if the screen expands or contracts due to changes in the surrounding environmental conditions, the contact position between the presser member and the screen is fixed. After all, distortion occurs on the screen and image display performance tends to deteriorate. In addition, when a pressing force is applied elastically from a direction perpendicular to the sheet surface, there is a problem that the thickness of the device becomes large.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a thin projection screen mounting device that does not reduce image display performance even when the screen expands and contracts due to changes in surrounding environmental conditions. .

[Means for Solving the Problems] According to the present invention, the above object is achieved by providing an apparatus for attaching a sheet-like projection screen, which engages along the misreading on at least two sides of the screen. A rod is arranged, the at least two sides are engaged with the engaging rod, and the engaging rod is given an action to apply a tensile force to the screen that engages with the engaging rod. A projection screen mounting device is provided, characterized in that:

In the present invention, a connecting rod is arranged along a screen side other than the screen side to be engaged with the engaging rod, and the connecting rod is made expandable and contractible in its length direction, and the connecting rod and the engaging rod are are connected to each other and a frame is formed in a state in which an elongating force is applied to the connecting rods, thereby configuring means for applying an action to the engaging rods to pull the screen sides outward. There are aspects characterized by.

In the present invention, there is a mode characterized in that the above-mentioned connecting rod also serves as the above-mentioned engaging rod.

In the present invention, an aspect is characterized in that when the engaging rods are connected to each other, the connecting rods are connected to each other, and the engaging rod and the connecting rod are connected, the angles formed by these rods are fixed. There is.

The present invention is for a screen having a plurality of sets of parallel opposing sides, and is characterized in that the stretching force applied to the connecting rod is different for each set of opposing parallel sides. There are ways to do so.

In the present invention, the screen is constructed by stacking two sheets, and a common engagement member is used to engage the engagement rod on the corresponding side of each sheet, and the engagement There is an embodiment characterized in that both ends of the member are connected to corresponding sides of each sheet, and the intermediate part is slidably engaged with the engaging rod in the longitudinal direction thereof.

The present invention has an aspect characterized in that an elastic member is used as the engagement member.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of an apparatus for mounting a projection screen according to the present invention, and FIG. 2 is a sectional view taken along line nn.

In the figure, 2 is a sheet-like screen, which has a rectangular shape. The screen is made of a translucent plastic such as polymethyl methacrylate, and as shown in FIG. 2, is a lenticular lens sheet.

Sleeve-shaped engaging members 4a to 4d are attached to the four sides of the screen 2 along the length of each side. The engaging members are made of plastic film or the like, and are sewn to each side of the screen 2.

A rod 6a is provided in each of the engaging members 4a to 4d.
~6d is inserted. The rods extend along each side of the screen 2, and each end of the rod 6a is connected to one end of the rods 6b and 6d at a right angle, and each end of the rod 6b is connected to one end of the rods 6a and 6c, respectively. Each end of the rod 6C is connected to one end at a right angle, and each end of the rod 6C is connected to the rod 6C at a right angle.
Each end of the rod 6d is connected at a right angle to one end of the rods 6a and 6c, respectively. These rods are connected to each other at an angle of 90 degrees, and thus a rectangular frame is formed by the four rods.

As shown in FIG. 1, each of the rods 6a to 6d has a compressed coil spring 8a to 8d in the center thereof, and the rod can be expanded and contracted in the longitudinal direction by the spring portion.

FIG. 3 is a sectional view for explaining the expansion and contraction mechanism of the rod 6a.

As shown in the figure, the rod 6a includes a rod 10a with a hole at one end and a rod 12a with a small diameter portion at one end, and the small diameter portion of the rod 12a is inserted into the hole of the rod 10a. are coaxially and slidably accommodated, and a compressed coil spring 8a is arranged around the small diameter portion between these two rods.

The same applies to the other rods 6b to 6d.

The rods 6a to 6d are not only engagement rods in the present invention but also connection rods in the present invention.

That is, the rods 6a to 6d and the engaging members 4a to 4d are slidably engaged in the longitudinal direction of each rod,
In addition, the coil springs 8 of the rods 6b and 6d are attached to the rods 6a and 6c.
Based on the stretching force caused by the rods 6b and 8d, a force is acting to separate them from each other in the X direction, and the screen 2 is expanded in the X direction. Similarly, the rods 6b and 6d have the rods 6a,
Based on the stretching force of the coil springs 8a and 8c of 6c, a force is applied to separate the screen 2 from each other in the X direction, and the screen 2 is expanded in the X direction.

In this embodiment as described above, when the screen 2 expands or contracts due to a change in ambient environmental conditions (for example, a temperature change or a humidity change), the tension of the screen and the stretching force of the rods 6a to 6d are balanced. Shift to a new equilibrium state. During the transition, the rod expands and contracts, but since the engaging member slides with respect to the rod in the length direction of the rod,
Even in the new equilibrium state, each side of the screen 2 remains pulled outward only in the direction perpendicular to the misreading.

Therefore, uniform stress is always applied to the entire surface of the screen 2, and even when the surrounding environmental conditions change, the screen 2 maintains its flatness, and the image display performance does not deteriorate.

Incidentally, as shown in FIG. 1, the connection parts (parts of corners) between the rods and the four corners of the screen 2 can be connected by strings 14a to 14d, respectively, so that the screen The expanded state of the four corners of No. 2 can be maintained better.

FIG. 4 is a partial perspective view showing a modification of the first embodiment.

In this modification, the engaging members (4a, etc.) are not provided over the entire length of the rod (68, etc.), but are provided discretely at appropriate intervals. Depending on the degree of rigidity of the screen 2, this modification can also provide the same effects as the above embodiment.

FIG. 5 is a partially cutaway partial perspective view showing a second embodiment of the apparatus for mounting a projection screen according to the present invention, and FIG. 6 is a sectional view thereof. Note that although only a part of one side of the screen is shown in these figures, the same applies to the other sides.

In this embodiment, the rod 6a' has an approximately C-shaped cross section with an opening in the portion facing the screen 2, and a pair of locking portions 7 are attached along the opening, and the locking portions engage the rail. An engaging member 4a' is engaged within such a rod. Similar to the example shown in FIG. 4, the engaging members are discretely attached to the sides of the screen 2 at appropriate intervals along the sides of the screen. The engagement member 4a' has a pair of rotatable wheels 5, which are connected to the rod 6a'.
It is possible to roll and move in the length direction on the rail formed by the locking part 7.

In this embodiment, as in the first embodiment, four rods form a frame, and each rod is assembled with an elongating force applied thereto.

In this embodiment, as in the first embodiment, when the screen 2 expands or contracts due to changes in ambient environmental conditions (for example, temperature changes or humidity changes), the tension of the screen and the rods 6a°, etc. A new equilibrium state is reached in which the elongation force of Even in the new equilibrium state, each side of the screen 2 is maintained in a state where it is pulled outward only in the direction perpendicular to the misreading, and thus uniform stress is always applied to the entire surface of the screen 2, improving image display performance. will not decrease.

FIG. 7 is a partial perspective view showing the components of a third embodiment of the apparatus for mounting the projection screen according to the present invention, and FIG. 8 is a sectional view showing the state in which the projection screen is mounted. Note that although only a part of one side of the screen is shown in these figures, the same applies to the other sides.

In this embodiment, the rod 6a'' is a rod-shaped body with a circular cross section and a locking rail portion 7'' attached along its longitudinal direction, and an engaging member 4a'' is engaged with the rail portion. There is. The engaging member has a substantially T-shaped cross section and is slidably engaged with the locking rail portion 7° in the longitudinal direction of the rod. The engaging member is connected to the screen 2 as in the example shown in FIG.
They are attached to the side of the screen discretely at appropriate intervals along the side of the screen.

In this embodiment, as in the first embodiment, four rods form a frame, and each rod is assembled with an elongating force applied thereto.

In this embodiment, as in the first embodiment, when the screen 2 expands or contracts due to changes in ambient environmental conditions (for example, changes in temperature or humidity), the tension of the screen and the rods 6a'', etc. A new equilibrium state is reached in which the elongation force of Even in the new equilibrium state, each side of the screen 2 is maintained in a state where it is pulled outward only in the direction perpendicular to the misreading, and thus uniform stress is always applied to the entire surface of the screen 2, improving the image display performance. will not decrease.

FIG. 9 is a plan view showing a fourth embodiment of the projection screen mounting apparatus according to the present invention.

In this embodiment, the engaging members 4a and 4c are attached only to two opposing sides of the screen 2, and the rods 6a and 6C that engage with the engaging members are simple rods that do not have coil springs and cannot be expanded or contracted. This embodiment differs from the first embodiment in that it is a rod-shaped body.

In this embodiment, the rods 6a and 6c are the engaging rods according to the invention, and the rods 6b and 6d are the connecting rods according to the invention.

In this embodiment, as in the first embodiment, when the screen 2 expands or contracts due to changes in ambient environmental conditions (for example, temperature changes or humidity changes), the tension of the screen and the rods 6b, 6d However, the engagement members 4a, 4c shift to a new equilibrium state in which the extension forces of the engaging members 4a, 4c
Since the rods 6a and 6c slide in the longitudinal direction of the rods, even in the new equilibrium state, the two opposing sides of the screen 2 engaged with the rods will move outward only in the direction perpendicular to the misreading. In this way, even stress is always applied to the entire surface of the screen 2, and the image display performance does not deteriorate.

As a modification of this embodiment, as shown in FIG. 10, elastic members 9 are attached to both longitudinal ends of the rods 6a, 6c of the engaging members 4a, 4c, and the elastic members are attached to the rods 6b, 6c. 6d
By passing the rod 6 over the screen 2,
A tensile force can also be applied in the length direction of a and 6c.

Furthermore, in the example shown in FIG. 9, the engaging members are attached only to the upper and lower sides of the screen 2, and the engaging members
, 6d, and the left and right ends of the engaging member may be fixed to the rods 6b, 6d to apply a tensile force to the screen 2 in the left-right direction. In addition, the rod 6b
, 6d may be provided with a coil spring to make them expandable and retractable, thereby applying a tensile force to the screen 2 in the vertical direction.

FIG. 11 is a partial sectional view showing a fifth embodiment of the projection screen mounting apparatus according to the present invention.

This embodiment is an example in which the screen 2 is composed of two sheets stacked one on top of the other.

That is, the screen 2 consists of a lenticular lens sheet 2'' and a Fresnel lens sheet 2'', and one edge of the engaging member 4a is connected to the lenticular lens sheet 2.
The other end of the engaging member 4a is attached to the Fresnel lens sheet 2'.

It is installed on the side.

In addition, if necessary, the above lenticular lens sheet 2
In order to maintain a small distance between the Fresnel lens sheet 2' and the Fresnel lens sheet 2', the engaging member 4a can be held between appropriate pinch members 16.

In the above embodiments, it is also possible to use an elastic body as the engagement member.

Further, in the above embodiments, the screen 2 has a rectangular shape, but in the present invention, the screen may have a shape other than four sides.

Further, in the above example, a lenticular lens sheet or a Fresnel lens sheet is used as the screen, but it is of course possible to apply to various screens made of sheets other than these.

Furthermore, as a means for applying an elongating force to the rod, various elastic means other than the spring described in the above example can be employed.

[Effects of the Invention] As described in detail above, according to the present invention, the flatness of the screen can be maintained, and even when the screen expands and contracts due to changes in the surrounding environmental conditions, the image display performance does not deteriorate, and it is possible to achieve thin projection. Screen mounting equipment is provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of an apparatus for mounting a projection screen according to the present invention, and FIG. 2 is a sectional view taken along line nn. FIG. 3 is a sectional view for explaining the expansion and contraction mechanism of the rod. FIG. 4 is a partial perspective view showing a modification of the first embodiment. FIG. 5 is a partially cutaway partial perspective view showing a second embodiment of the apparatus for mounting a projection screen according to the present invention, and FIG. 6 is a sectional view thereof. FIG. 7 is a partial perspective view showing the components of a third embodiment of the apparatus for mounting the projection screen according to the present invention, and FIG. 8 is a sectional view showing the state in which the projection screen is mounted. FIG. 9 is a plan view showing a fourth embodiment of the projection screen mounting apparatus according to the present invention. FIG. 10 is a diagram showing a modification of the embodiment shown in FIG. 9. FIG. 11 is a partial sectional view showing a fifth embodiment of the projection screen mounting apparatus according to the present invention. 2 Niscreen, 4a-4d, 4a, 4a 6a-6d, 6a, 6a 8a-8d: Coil spring. : Engagement member, : Rod,

Claims (7)

[Claims] (1) A device for attaching a sheet-like projection screen, wherein engaging rods are arranged along at least two sides of the screen, and the at least two sides are engaged with the engaging rods. 1. A projection screen mounting device, characterized in that said engagement rod is provided with an action that applies a tensile force to the screen engaged with said engagement rod. (2) A connecting rod is disposed along a screen side other than the screen side to be engaged with the engaging rod, and the connecting rod is expandable and contractable in its length direction, and the connecting rod and the engaging rod are each A frame body is formed in a state where the connecting rods are connected and an extension force is applied to the connecting rods, thereby forming a means for applying an action to the engaging rods to pull the screen side outward. Claim 1
The projection screen mounting device described in . (3) The projection screen mounting device according to claim 2, wherein the connecting rod also serves as the engaging rod. (4) Claim 2, characterized in that when the engaging rods are connected to each other, the connecting rods are connected to each other, and the engaging rod and the connecting rod are connected, the angles formed by these rods are fixed. The projection screen mounting device described in . (5) A screen having a plurality of sets of opposing parallel sides, characterized in that the stretching force applied to the connecting rod is different for each set of opposing parallel sides. 3. The projection screen mounting device according to claim 2. (6) A screen constructed by stacking two sheets, in which a common engagement member is used to engage the corresponding sides of each sheet with an engagement rod; 2. The projection screen according to claim 1, wherein both end portions are connected to corresponding sides of each sheet, and the intermediate portion is slidably engaged with the engagement rod in the longitudinal direction thereof. Mounting device. (7) The projection screen mounting device according to claim 1, wherein an elastic member is used as the engagement member.