JP2009009043A - Reflection type screen device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflection type screen device capable of easily adjusting a screen face so as to be almost perpendicular to an optical axis projected to the reflection type screen device from a projector, and thereby capable of solving a problem wherein a projected picture has difference in definition and color itself between both left and right ends or between both upper and lower ends of the projected image. <P>SOLUTION: The reflection type screen device includes at least: a reflection type screen 1 with high luminance; a lifting/lowering means 2 that freely lifts or lowers the screen and has a pantograph linkage mechanism; a forward tilting means for forward tilting the picture showing face of the screen in the direction of picture projection; and a take-up storage means for taking up and storing the reflection type screen. The screen device is freely portable. In addition, the center optical axis of an image projected onto the screen is kept almost perpendicular to the image projection surface of the screen by the tilting means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-brightness type reflective screen device that is preferably used in a projector such as a movie or a projector.

  The image projected on the screen from a projector such as a conventional projector looks better when the contrast of light and dark is larger. By the way, the brightness of the bright area of the light / dark contrast is determined by the brightness of the video, but the brightness of the dark area is determined by the brightness of the room. Therefore, if the brightness of the dark area (indoor) is reduced, the contrast is improved, but it is not always easy to improve the brightness of the bright area (the brightness of reflected light from the screen).

  Therefore, in order to improve the contrast, it is effective to reduce the luminance in the dark region. Therefore, movies are generally projected in a dark room, but it is strongly hoped that projectors other than movies (overhead projectors, video projectors, etc.) can be observed in a room with normal brightness. It is rare.

  In order to meet such a demand, various ideas have been made as proposed in Patent Documents 1 to 5 as reflective screens with improved luminance. For example, a bead-type screen is used in which glass beads are processed on the surface of a vinyl chloride resin film or sheet to increase the reflection luminance. There is also known a two-layer reflective screen including a reflective layer for reflecting light from a projector and a light diffusion layer for diffusing reflected light.

  In such a two-layer reflection type screen, the reflection layer is made of an aluminum vapor deposition layer or an aluminum paste coating layer, and the light reflected by the reflection layer is further diffused by the light diffusion layer, so that a relatively wide viewing angle can be obtained. It is devised so that you can see images without glare. However, in such a reflective screen, since the reflected light is diffused by the light diffusion layer, the screen gain value is generally low, and the contrast is lowered due to the influence of external light particularly when used for video viewing in a bright room. There is a problem.

  Therefore, as a screen that allows you to enjoy clear images in a bright room without increasing the power consumption of the projector, as described above, it has a hybrid structure in which the reflective layer and the diffusion layer are bonded together on the base support layer. It has been proposed to form a minute and dense crater structure on the reflecting surface by embossing or the like (refer to Patent Document 6 for the crater structure).

  The minute and dense crater structure formed on this reflecting surface has a feature of absorbing light shifted in the vertical direction and reflecting light from the front efficiently. In other words, only the light from the projector coming from the front is efficiently projected, and external light that enters diagonally, such as room light, is less likely to affect the screen. Therefore, a clear image can be displayed even in a bright room, and if the room is darkened, the same brightness can be maintained even if the light quantity of the projector is reduced by 44%, for example.

  However, this type of reflective screen is effective when the optical axis of the image projected from the projector is projected at a substantially right angle to the screen, but a problem occurs otherwise. In other words, if the optical axis of the projected image is not substantially perpendicular and the projection angle is shifted in the horizontal direction or the vertical direction, the projected image has a sharpness and color at the left and right ends or both upper and lower ends. However, there arises a problem that a difference occurs.

  Therefore, in order to deal with such problems, conventionally, the user can change the position and angle of the projector main body or the screen main body by looking at the sharpness of the upper, lower, left and right images projected from the projector to the screen. It is necessary to adjust so that the image is normal. However, the conventional screen device is not provided with a mechanism for effectively adjusting the screen angle, and this adjustment is complicated and time-consuming.

JP-A-5-173249 JP-A-6-67306 JP-A-6-75302 JP-A-6-75303 Japanese Patent Laid-Open No. 9-96870 Japanese Unexamined Patent Publication No. 7-159899

  The present invention has been made in view of the problems of the prior art described above, and the screen surface is easily adjusted so as to be substantially perpendicular to the optical axis projected from the projector on the reflective screen device side. Accordingly, an object of the present invention is to provide a reflective screen device that can solve the problem that the projected image has a difference in the sharpness and color itself at both the left and right ends or the upper and lower ends.

Here, as the present invention for achieving the above object, there are provided the reflection type screen devices described in the following (1) to (4).
(1) A high-brightness reflective screen, the screen can be moved up and down, and lift means comprising a pantograph-type link mechanism, forward tilt means for tilting the projection surface of the screen forward in the image projection direction, and A screen device comprising at least a winding and storing means for winding and storing a reflective screen, wherein the front screen device is portable, and the central optical axis of the image projected on the screen by the tilting means And a screen image projection surface of the screen are maintained at substantially right angles.
(2) The reflection type screen device according to (1), wherein the forward tilting means is a second pantograph type link mechanism provided by connecting an upper end of the screen and an upper end of the pantograph type link mechanism.
(3) Two sliders are provided for the two slide joints provided at the ends of the second pantograph type link mechanism, and right and left screws are screwed to each slider. Threadedly engaged with each of the shafts, and rotating the shafts forward and backward to slide the slide-type joint, and extending and contracting the second pantograph type link mechanism to tilt the screen forward (2) The reflective screen apparatus as described.
(4) The forward tilting means comprises a goniometer stage fixed to the lower end of the pantograph-type link mechanism constituting the lifting means, and the screen is tilted forward together with the lifting means by rotating the rotary stage of the goniometer stage. The reflective screen device according to (1).
In the present invention, “substantially perpendicular” refers to a case where the projection angle formed by the central optical axis projected from the projector and the screen surface is in the range of 80 ° to 100 °.

  As described above, according to the present invention, when an image is projected from a projector such as a projector on a high-brightness reflective screen, the optical axis of the projected image is substantially perpendicular at the center of the screen surface. Thus, it has a screen device that can be easily adjusted. For this reason, a clear image can be projected on the screen easily and in a short time, and the projected image has a difference in sharpness and color itself at both the left and right ends or the upper and lower ends. There is a particularly remarkable effect that can be eliminated.

As described above, the screen device according to the present invention adopts an embodiment in which the screen can be tilted forward so that the projection angle formed by the central optical axis projected from the projector and the screen surface is substantially a right angle. It is a big feature. Therefore, this feature will be described in detail below with reference to the drawings.
In the screen device according to the present invention, a well-known mechanism can be used as a mechanism for allowing the clean to stand independently and placing it in a stretched state. Therefore, in order to explain the characteristics of the present invention, two embodiments according to the screen lifting means will be described first.

  First, the embodiment according to the lifting / lowering means of the first screen 1 is a mechanism as shown in FIG. Since the details of this mechanism are described in Japanese Patent Application Laid-Open No. 2000-131766, only the main part thereof will be briefly described below, avoiding repeated description. 4 (a) is a schematic front view showing the screen 1 in an expanded state, and FIG. 4 (b) is a schematic plan view showing the screen 1 wound around a spring roll 5c described later. The figures are shown in a folded state in the storage box 7 with the lid 7a.

  The self-supporting screen 1 illustrated in FIG. 4 includes a substantially rhombus-shaped pantograph-type link mechanism 2 (hereinafter simply referred to as “link mechanism 2”) that can be raised and lowered. As shown in FIG. 4, the link mechanism 2 includes four link members (arms) 21a, 21b, 21c, and 21d, and these four link members 21a, 21b, 21c, and 21d, which are rotatable. It is composed at least of joint members 22a, 22b, 22c, and 22d to be connected to each other, so that it can be moved up and down.

  At that time, the joint member 22a located at the upper end is provided with an upper end connecting member 3a for connecting the upper end support bar 3 and the link mechanism 2 that support the upper end of the screen 1 in the width direction of the screen 1 in a state where the screen 1 is expanded. It is provided, and the screen 1 can be moved up and down in conjunction with the lifting and lowering of the link mechanism 2.

  At this time, a known spring roll structure is adopted for winding the screen 1, and the screen 1 is urged in the winding direction of the screen 1 by a spring (not shown) incorporated in the spring roll 5 c. It has a function of automatically winding it on the spring roll 5c when the pulling force of the spring is relaxed. Both ends of the spring roll 5c are held and fixed to the storage case 7 that holds the base member 4 via fixing members 5a and 5b, whereby the spring roll is pulled when the screen 1 is drawn and wound. 5c has a rotating structure.

  At that time, it is preferable to provide the extension urging means 6 in the link mechanism 2 so that the screen 1 can be smoothly raised and lowered when the screen 1 is raised and lowered manually. In FIG. 4, as the extension biasing means 6, two left and right wires 64 a, 64 a, 4 b, 64 b each having one end locked to the base member 4 via springs 62 a, 62 b are attached to both ends of the base member 4. The two pulleys 63a, 63a, 63b, 63b, which are rotatably mounted, are respectively wound around and inverted inwardly, and the other ends of the pulleys are respectively in front of the middle part of the lower link members 21c, 21d on the opposite sides. The lower link members 21c and 21d of the link mechanism 2 are pulled inward by the pulling force of the springs 62a and 62b acting on the two left and right wires 64a, 64a, 64b and 64b. The structure which urges | biases the link mechanism which comprises the means 2 to the expansion | extension direction is illustrated.

  Next, an embodiment of the second screen lifting / lowering means will be described with reference to FIG. Since the details of this mechanism are described in Japanese Patent Application Laid-Open No. 2004-246161, as in the embodiment related to the first screen raising / lowering means, here, avoid duplication of explanation. Only the main part will be briefly described below.

  However, FIG. 5A is a schematic front view showing the screen 1 in an expanded state, and FIG. 5B is a schematic plan view showing the screen 1 wound around a spring roll 5c described later. FIG. 4 illustrates each of the drawings folded and stored in a storage box (not shown). As described above, FIG. 5 (b) shows a state when the screen device according to the present invention is not used, but the elevating means 2 composed of the pantograph type link mechanism is moved to the base member 4 side. It is folded and stored in a storage box (not shown).

  In the second embodiment, as shown in FIG. 5, the pantograph-type link mechanism 2 constituting the lifting means 2 for lifting the screen 1 has six link members (arms) 21a, 21b, 21c, 21d, 21f, 21e, and seven joint members 22a, 22b, 22c, 22d, 22e, 22f for rotatably connecting these four link members 21a, 21b, 21c, 21d, 21f, 21e to each other 22g so that the screen 1 can be moved up and down.

  At this time, the spring roll 5c for winding the screen 1 is provided between the base member 4, the spring roll 5c attached to the base member 4 via the fixing members 5a and 5b, and the upper end support bar 3 and the spring roll 5c. A screen 1 to be extended and an elevating means 2 including a pantograph type link mechanism that expands and contracts the screen 1 to be movable up and down are provided.

  Here, in the elevating means 2, as shown in FIG. 5, one end of the link member 21e and one end of the link member 21f are connected to the W-shaped member 4a provided at the intermediate portion of the base member 4 via the joint member 22g. And are pivotally connected. Further, the other ends of the link members 21e and 21f are connected to one ends of the link members 21c and 21d via joint members 22e and 22f, respectively, so as to be rotatable. Also. At the same time, the link member 21c and the link member 21d intersect with each other, and the intersection is rotatably connected by the joint member 22d.

  Subsequently, the other end of the link member 21c is rotatably connected to one end of the link member 21b via the joint member 22c, and the other end of the link member 21d is connected to one end of the link member 21a via the joint member 22b. It is connected so that it can rotate freely. Further, the other ends of the link member 21b and the link member 21a are rotatably connected via the joint member 22a. At the same time, the U-shaped member 3b is pivotally attached to the joint member 22a, and the U-shaped member 3b is attached to the intermediate bracket 3a supporting the upper end support rod 3 so as to be horizontally rotatable. Has been.

  Further, as shown in FIG. 5 (a), one of the pair of gas springs 6 and 6 used for maintaining the height of the screen 1 has both ends thereof connected to the link member 21e and the link member 21c via connecting portions. The other end is locked to the link member 21f and the link member 21d via the connecting portions. Thus, a repulsive force composed of gas pressure is generated against the elastic force and gravity of the spring of the spring roll 5c.

  At this time, when the screen device is not used, the elevating means 2 is folded and stored in a storage box (not shown), so that it is very easy to carry. In such a state, the screen 1 is completely wound around the spring roll 5c by the elastic force of a spring (not shown) attached to the spring roll 5c, and the six link members 21a constituting the lifting means 2 are provided. , 21b, 21c, 21d, 21e, 21f are in a state of being completely folded and stored in the storage box as shown in FIG. 5 (b).

  Next, when using the screen device, when the upper end support bar 3 is pulled upward, the screen 1 is pulled out from the spring roll 5c against the elastic force and gravity of the spring attached to the spring roll 5c. In the gas spring 6 provided as the extension biasing means, high pressure gas is sealed inside the cylinder via a piston having an orifice, and volume change in the cylinder accompanying expansion and contraction of the piston rod is transferred via oil. And indirectly or directly by adjusting the gas pressure.

  Therefore, when the screen 1 is going to descend, the piston rod is compressed, so that a repulsive force due to the gas pressure inside the gas spring 6 is generated and the screen 1 is restrained from descending, so the screen 1 is set to an arbitrary height. can do. Further, when storing, the user simply pushes the upper support rod 3 downward, and the lifting means 2 is slowly lowered and folded without dropping, and the screen 1 is wound around the spring roll 5c. After rotating to the state shown in FIG. 5 (b), it is stored in a storage box (not shown) together with the lifting means 2 in a folded state.

  In this way, the portable and self-supporting screen device according to the present invention, unlike the wall-mounted fixed screen device, can easily install endosperm in a desired place, and the screen device itself from the installation surface such as the floor. Can be a self-supporting system. In addition, about the raising / lowering means 2, if the state which raised the screen 1 can be maintained stably, it is not necessary to specifically limit. However, considering the portability and compact design of the screen device, it is preferable to have a structure that can be folded as shown.

  In the screen device of the present invention having at least the components as described above, the main feature picture of the present invention is that an image is projected with respect to the optical axis projected from a projector such as a projector (not shown). The projection surface of the screen 1 projected on the screen can be adjusted to a substantially right angle easily and in a short time. This point will be described in detail with reference to FIGS.

  Here, FIG. 1 schematically illustrates only the skeleton portion of the screen device described in FIGS. 4 and 5 with respect to a state in which the screen 1 is raised by the above-described lifting means 2 and maintained in a self-supporting state. FIG. 3 is a schematic skeleton diagram (side view). In this figure, a screen 1 indicated by a one-dot chain line is a screen 1 immediately after startup by a lifting device 2 indicated by a broken line, and the screen 1 indicated by a solid line is further tilted forward by a forward tilting means 8. Indicates.

  In the present invention, the screen 1 in the state indicated by the alternate long and short dash line is placed in front of the screen 1 to a position (a position indicated by a solid line) that is substantially perpendicular to the central optical axis projected from the projector (not shown). Tilt. Therefore, in order to play such a role, the forward tilting means 3 is installed between the joint member 22a at the upper end portion of the elevating means 2 composed of the pantograph type link mechanism and the upper end support bar 3 of the screen 1. Then, the screen 1 is tilted forward by operating the forward tilting means 3 constructed in this way as described later.

  Here, the forward tilting means 3 that plays the role of tilting the screen 1 forward has a mechanism as shown in FIG. 2 and, as shown in FIG. 5, with respect to the central optical axis projected from the projector. The screen 1 is tilted forward so as to be substantially perpendicular. In addition, this FIG. 2 is the top view which illustrated typically one Embodiment which concerns on the forward tilting means 3 of this invention.

  Here, in the embodiment shown in FIG. 2, the forward tilting means 8 is constituted by a second pantograph type link mechanism as shown in the figure. Here, the second pantograph type link mechanism includes four link members 81a, 81b, 81c, 81d, eight joint members (joints) 82a, 82b,..., 82h, a rail 83, and a ball screw. The ball shaft 84 is screwed (the 84a portion is screwed with a right screw and the 84b portion is screwed with a left screw), the sliders 85a and 85b, and the bearing portions 86 and 87 of the ball shaft 84. And a driving means 88 of the ball shaft 84.

  At this time, the four joint members 82a, 82b, 82g, and 82h are slide-type joint members, and the remaining four joint members 82c, 82d, 82e, and 82f are rotary-type joint members, and the slide-type joints. The members 82a and 82b are respectively attached to the sliders 85a and 85b, and the slide-type joint members 82g and 82h can be slidably moved in the groove direction while being engaged with the grooves 3c processed into the guide 3d. ing.

  Therefore, when the ball shaft 34 is rotated by the driving means 88, the two sliders 35a and 35b move in the rail 83 toward the bearing portion 37, respectively, and as a result, a pantograph-type link mechanism as shown in the figure. As a result, the upper end support bar 3 of the screen 1 is moved in the forward tilt direction of FIG. 2 (→ arrow direction shown in FIG. 1). Then, the screen 1 is tilted forward so as to be pushed out to the projector side (not shown). As a result, as shown in FIG. 1, the central optical axis projected from the projector not shown is maintained substantially perpendicular to the surface of the screen 1.

  In addition, by rotating the ball shaft 84 in the direction opposite to the above by the driving means 38, the two sliders 85a and 85b are moved away from each other in the rail 83, so that they are released from the forward inclined posture. can do. In addition, the position at this time is the position of the screen 1 indicated by a chain line in FIG.

  As described above, according to the screen device of the present invention, since the central optical axis projected from the projector, which the high-brightness reflective screen 1 has, is substantially perpendicular to the screen 1, this is a problem in the past. The problem that the image projected on the screen, that is, the difference in the sharpness and the color itself at the left and right end portions or the upper and lower end portions of the screen 1 can be preferably solved.

  As the forward tilting means according to the present invention, various embodiments can be considered in addition to those illustrated in FIG. FIG. 3 is a schematic explanatory view showing another example of such forward tilting means 3. In FIG. 2, FIG. 3A shows a known gonio stage, and FIG. 3B is an explanatory view showing an example in which the gonio stage is used as the forward tilting means 3.

  In FIG. 3, a known gonio stage 8 ′ used as the forward tilting means 8 of the present invention includes a rotary knob 81 ′, a fixed stage 82 ′, a rotary stage 83 ′, and a substrate 84 ′. By rotating the knob 81 ′, the rotary stage 83 ′ can be rotated by a predetermined angle. Therefore, this gonio stage 8 'is fixed by being interposed between the W-shaped member 4a and the base member 4 illustrated in FIG. 5 (second embodiment of the lifting means).

  In this state, when the rotary stage 83 'is rotated as illustrated in FIG. 3B, the rhombus link mechanism can be tilted forward as illustrated. Therefore, as shown in FIG. 2, the screen 1 can be moved forward by providing the forward tilting means 8 ′ on the lower end side of the lifting / lowering means 2 in the same manner as when the forward tilting means 3 is provided at the upper end of the lifting / lowering means 2. Can be tilted.

1 is a schematic skeleton diagram (schematic side view) schematically illustrating only a skeleton portion of a screen device of the present invention. It is the top view which showed one example of embodiment of the forward inclination means concerning this invention. It is explanatory drawing which showed the example of embodiment of the other forward inclination means of this invention. It is the model front view which illustrated the raising / lowering means to which the screen apparatus of this invention is applied. It is the model front view which illustrated the other raising / lowering means to which the screen apparatus of this invention is applied.

Explanation of symbols

1: Reflective screen 2: Lifting means (link mechanism)
3: Top support rod
3a: Upper end connecting member
3b: U-shaped member 4: Base member
4a: W-shaped member
5a, 5b: Fixed member
5c: Spring roll 6: Extension biasing means 7: Storage case
7a: Lid
21a, 21b, 21c, 21d, 21f, 21e: Link member
22a, 22b, 22c, 22d, 22f, 22e, 22f, 22g: Joint member
62a, 62b: Spring
63a, 63b: pulley
64a, 64b: Wire

Claims (4)

  High-brightness reflective screen, elevating means comprising a pantograph-type link mechanism, allowing the screen to be raised and lowered, forward tilting means for tilting the projection surface of the screen forward in the image projection direction, and the reflective screen A screen device comprising at least a winding and storing means for winding and storing the screen, wherein the front screen device is portable, and the central optical axis of the image projected on the screen by the tilting means and the screen A reflective screen device characterized by maintaining an image projection plane at a substantially right angle.   The reflective screen device according to claim 1, wherein the forward tilting means is a second pantograph type link mechanism provided by connecting an upper end of the screen and an upper end of the pantograph type link mechanism.   A shaft in which two sliders are provided for two slide joints provided at the ends of the second pantograph type link mechanism, and a right screw and a left screw are screwed to each slider. 3. The reflection according to claim 2, wherein the slide type joint is slid by rotating the shaft forward and backward, and the screen is tilted forward by expanding and contracting the second pantograph type link mechanism. Mold screen device.   The forward tilting means comprises a goniometer stage fixed to a lower end portion of a pantograph-type link mechanism constituting the elevating means, and the screen is tilted forward together with the elevating means by rotating the rotating stage of the goniometer stage. Item 2. A reflective screen device according to Item 1.

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