JP2013200465A - Rear projection type video display device - Google Patents

Abstract

A rear projection image display apparatus capable of easily adjusting the position of a screen unit is provided.
A flat cam 13 provided in a rear projection type image display device 100 is provided so as to move the screen unit 3 in the vertical direction as the flat cam 13 rotates. Further, the rear projection type image display device 100 includes a long bar 10 for rotating the flat cam 13 by an operation from the outside of the cabinet 4.
[Selection] Figure 6

Description

  The present invention relates to each rear projection type video display device constituting a large screen display system having a configuration for adjusting the position of a screen unit.

  In recent years, the demand for improved video technology and higher image quality has increased, and the digitalization of terrestrial broadcasts has changed to the analog system such as the NTSC (National Television System Committee) system that has been used in the past. The use of image quality is increasing rapidly. The demand for high-definition video is required not only for viewing at home, but also for business use such as monitoring activities in various infrastructures and information guidance using video.

  The use of large-screen video equipment enables monitoring and viewing of video by a large number of people, while simultaneously displaying various video sources on a single video that combines multiple video equipment, and enormous amounts of information. Can be displayed at a time. For example, in addition to general information such as maps and routes, multiple images from cameras installed at each site are displayed on a single screen in real time, allowing multiple people to simultaneously view images at different positions. View and share information.

  Conventionally, there is a method of constructing a large screen display system (multi-vision) by arranging one video device vertically and horizontally for monitoring and information guidance, and rear projection is used as the video device used for the large screen display system. Type image display devices (rear projectors) have been adopted.

  A rear projection type video display device is a video display device that creates a video by projecting a video from a projection device arranged in a cabinet onto a screen arranged in front of a viewer from the back. The screen of this rear projection type image display device is unitized by two plate-like screens made of a transparent resin material such as acrylic called Fresnel lens and lenticular lens and a metal frame for holding them as a unit. Is done. The screen unit is structured to be fixed to the cabinet.

  The rear projection type video display device does not require components arranged around the screen like a liquid crystal panel or a PDP (Plasma Display Panel) panel. Therefore, the non-video area around each screen can be made very small. As a result, it is possible to reduce the number of joints between the screens of video devices that are important in configuring a large screen, and to reduce the sense of unity of the entire screen and the lack of video.

  Generally, a cabinet of a rear projection type image display device is made of a metal member such as an aluminum alloy or iron in order to maintain a certain degree of rigidity and earthquake resistance. The transmissive screen is made of a plastic such as an acrylic material. Resin acrylic material has a larger coefficient of linear expansion than metal material, and when the temperature and humidity of the place where it is used rises, the amount of screen expansion becomes larger than the cabinet.

  When the external dimensions (external size) of the cabinet and the screen are the same, adjacent screens come into contact with each other and damage the end face of the screen. In addition, when the outer dimension of the screen is extended due to an increase in temperature and humidity, the screen cannot be extended because there is an adjacent screen in the outer direction, and the screen itself may be warped.

  Therefore, in a large screen display system constructed by stacking a plurality of rear projection type video display devices vertically and horizontally, it is necessary to make the screen smaller than the external dimensions (external size) of the cabinet. This gap between adjacent screens is called joint width.

  When building a large-screen display system by stacking multiple rear-projection image display devices vertically and horizontally, first stack the cabinets vertically and horizontally, and then arrange the screen so that the images of the large-screen display system are uniform throughout To do. In other words, it is important to improve the appearance so that the joint width is uniform between screens. At that time, a general method is to fix the cabinet and the screen while sandwiching a plate having a thickness corresponding to the joint width calculated from the linear expansion coefficient of each material between the adjacent screens. However, this work requires a work of at least two persons: a person holding the screen position on the front side and a person fixing the cabinet and the screen with screws or the like, and the screen size is as large as 1 meter or more. For this reason, it is difficult to adjust the position of the screen and fix it to the cabinet.

  Techniques for adjusting the positions of adjacent screens as described above are disclosed in Patent Documents 1 and 2. In the technology of Patent Document 1 (hereinafter also referred to as Conventional Technology A), a multi-vision device is disclosed in which a plurality of unit screens are joined together with edges of adjacent units with an adhesive to form a large screen. . The multivision device has a joint adjustment mechanism. In the joint adjusting mechanism, a mark is provided on an extension line of the partition line by the partition plate that partitions the screen for each unit. Further, the joint adjusting mechanism uses an elastic member and an adjustment screw to connect the end of the screen bonding surface to the mark so that the extension line of the screen bonding surface generated by bonding of the edge of the adjacent unit screen matches the mark. This is a mechanism for adjusting the position.

  Patent Document 2 discloses the following technique (hereinafter also referred to as conventional technique B). Prior art B adjusts the support for hanging the screen in a multi-screen projector in which the screen is suspended from a cabinet in a state where tension is applied by attaching the left and right sides or the periphery of the screen using a plurality of wires and springs. The structure which enables it to move up and down and right and left with a screw is disclosed.

JP-A-7-209756 Japanese Patent No. 2776944

  However, the conventional techniques A and B have the following problems.

  In the prior art A, there is a risk that the adhesive may adhere to the screen surface when adhering the edge of the unit screen, and the work content becomes very delicate. In particular, when a liquid adhesive is used, the surface of the lenticular lens or the Fresnel lens has a fine uneven shape, so that the adhesive easily flows in due to a capillary phenomenon.

  Further, the screen units are assembled in units of a predetermined number. Therefore, as the number of screen units used in the large screen system increases, it is necessary to assemble each screen unit in advance before attaching the cabinet and the screen unit. Therefore, a large work space and delicate work are required. Moreover, in the prior art A, the adjustment screw for adjusting the position of a screen unit is arrange | positioned inside the screen unit. That is, in the related art A, there is a problem that it is not easy to adjust the position of the screen unit.

  In the conventional technique B, as in the conventional technique A, an adjustment screw for adjusting the position of the screen is arranged inside the screen unit. Therefore, it is necessary to determine the position of the screen in advance before fixing the screen unit and the cabinet, or to sequentially attach a plurality of screen units while positioning each screen unit in turn.

  Further, in the conventional technique B, if a certain screen unit needs to be replaced after the large screen display system is operated, only the screen unit is removed, and an alternative screen unit is placed at the same position as before the replacement. It is very difficult to place. As described above, the conventional technique B has a problem that it is not easy to adjust the position of the screen unit.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a rear projection type image display apparatus capable of easily adjusting the position of a screen unit.

  In order to achieve the above object, in the rear projection type image display device according to one aspect of the present invention, an image is projected from the rear surface of the screen unit. The rear projection type image display device includes a planar cam that is rotatably provided and has a rotating shaft that is eccentric, and a cabinet that is combined with the screen unit and covers the planar cam. The screen unit is provided to move the screen unit in a predetermined direction by rotating the flat cam, and the rear projection type image display device further rotates to rotate the flat cam by an operation from outside the cabinet. Provide mechanism.

  According to the present invention, the flat cam provided in the rear projection type image display device is provided so as to move the screen unit in a predetermined direction as the flat cam rotates. Further, the rear projection type video display device includes a rotation mechanism for rotating the flat cam by an operation from outside the cabinet.

  That is, the planar cam can be rotated by an external operation. Thereby, the screen unit can be moved in a predetermined direction. Therefore, the position of the screen unit can be easily adjusted.

1 is a side sectional view of a rear projection type image display device according to Embodiment 1. FIG. It is a perspective view of the large screen display system comprised using the some rear projection type video display apparatus. It is side surface sectional drawing of a large screen display system. It is a perspective view of each rear projection type video display device which constitutes a large screen display system. It is a side view of a screen unit. It is a perspective view of the back side of a rear projection type video display. FIG. 7 is an enlarged view of a partial region of FIG. 6. It is a figure which shows the structure of FIG. 7 seen from the arrow A. It is a figure for demonstrating the shape of a plane cam. FIG. 7 is an enlarged view of another part of FIG. 6. It is a figure which shows the structure of FIG. It is a figure which shows the state which rotated the plane cam only the predetermined angle. FIG. 10 is a diagram for explaining the operation of a planar cam according to a first modification of the second embodiment. It is a figure for demonstrating operation | movement of the plane cam which provided the weight. It is a perspective view of the back side of the rear projection type video display apparatus concerning the modification 3 of Embodiment 2. It is a perspective view of the back side of the rear projection type video display apparatus concerning the modification 4 of Embodiment 2. It is a perspective view of the back side of the rear projection type video display apparatus concerning the modification 5 of Embodiment 2. It is a perspective view of the back side of the rear projection type video display apparatus concerning modification 6 of Embodiment 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof may be omitted.

  It should be noted that the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements exemplified in the embodiments are appropriately changed depending on the configuration of the apparatus to which the present invention is applied and various conditions. It is not limited to those examples. Moreover, the dimension of each component in each figure may differ from an actual dimension.

<Embodiment 1>
FIG. 1 is a side sectional view of a rear projection type image display apparatus 100 according to the first embodiment.

  The rear projection type image display device 100 displays an image input from, for example, a PC (Personal computer).

  With reference to FIG. 1, a rear projection type image display apparatus 100 includes a projection unit 1, a reflecting mirror 2, a screen unit 3, and a cabinet 4.

  The cabinet 4 is a housing that houses various components. In FIG. 1, for the sake of simplification of the drawing, the reflecting mirror 2 is shown to protrude outside the cabinet 4. However, actually, the reflecting mirror 2 is accommodated in the cabinet 4.

  The projection unit 1 projects an image (image light). The reflecting mirror 2 folds the image (image light) output from the projection unit 1 in the middle of the optical path. Thereby, the depth of the rear projection type image display apparatus 100 (product) is shortened. The reflecting mirror 2 is disposed in a cabinet 4 as a casing.

  The screen unit 3 has a transmissive screen 3a. The transmissive screen 3 a forms an image from the projection unit 1. The screen unit 3 is arranged on the side where the user views the video in the rear projection video display device 100.

  In FIG. 1, an optical path 5 a is an optical path at the center of the image light output from the projection unit 1. The optical path 5 b is an upper optical path of the image light output from the projection unit 1. The optical path 5 c is an optical path below the image light output from the projection unit 1.

  The rear projection type video display device 100 projects the video (video light) output from the projection unit 1 onto the screen unit 3 (transmission type screen 3a) from the rear side. In other words, in the rear projection type image display device 100, an image is projected from the rear surface of the screen unit 3.

  In this configuration, when the image light is directly projected onto the screen unit 3 without using the reflecting mirror 2, the depth of the rear projection type image display device 100 (product) is increased. Therefore, the depth of the product is reduced by adopting a configuration in which the image light is reflected and folded by the reflecting mirror 2 attached at a certain angle inside the cabinet 4.

  That is, the video (video light) input from the personal computer or the like by the projection unit 1 is reflected by the reflecting mirror 2 arranged at an arbitrary position of the cabinet 4 and forms an image on the screen unit 3 (transmission type screen 3a). .

  In general, the projection unit 1 is disposed below the lower end of the screen unit 3 (transmission type screen 3a). In FIG. 1, for simplification of the drawing, a part of the projection unit 1 is shown to be above the lower end of the screen unit 3. However, actually, the projection unit 1 is disposed below the lower end of the screen unit 3 (transmission type screen 3a). Therefore, the outer shape of the cabinet 4 has a structure having a protrusion under the screen unit 3.

  FIG. 2 is a perspective view of a large screen display system 1000 configured using a plurality of rear projection type video display devices 100. The large screen display system 1000 displays, for example, a high-definition video accompanying digitization of video.

  FIG. 3 is a side sectional view of the large screen display system 1000.

  Referring to FIGS. 2 and 3, as an example, large screen display system 1000 includes nine rear projection video display devices 100 arranged in three rows and three columns. In addition, the number of the rear projection type image display devices 100 configuring the large screen display system 1000 is not limited to 9, and may be 4, 8, 16, or the like, for example.

  A gap between two adjacent transmissive screens 3a is a joint width. The joint width x is a gap between two transmissive screens 3a adjacent in the left-right (lateral) direction. The joint width y is a gap between two transmissive screens 3a adjacent in the vertical (vertical) direction.

  Here, the left-right direction is a direction parallel to a surface such as a floor on which the large screen display system 1000 is installed. Further, the vertical direction is a direction perpendicular to a surface such as a floor on which the large screen display system 1000 is installed. In the following, the horizontal direction may be referred to as the horizontal direction. In the following, the vertical direction may be referred to as the vertical direction.

  FIG. 4 is a perspective view of each rear projection type video display device 100 constituting the large screen display system 1000.

  The cabinet 4 is assumed to have a frame structure. Side surfaces 8a are provided at both ends of the left and right ends of the cabinet 4 in the left-right direction. The side surface 8a is fixed at each corner by a frame 8b having the same length as the length of the cabinet 4 in the left-right direction. Thereby, the cube-shaped cabinet 4 is comprised. That is, the cabinet 4 has a space for accommodating the projection unit 1. The shape of the cabinet 4 is such that it does not interfere with the upper and lower rear projection type video display devices 100 when the rear projection type video display devices 100 are stacked in the vertical direction.

  The cabinet 4 includes a frame 8c. The frame 8 c is provided on the front side of the cabinet 4.

  FIG. 5 is a side view of the screen unit 3.

  As shown in FIGS. 4 and 5, frames 8 g are provided at the upper and lower ends of the screen unit 3. Frames 8 f are provided at the left end and the right end of the screen unit 3.

  The transmission type screen 3a of the screen unit 3 is composed of two resin plate materials. The transmission screen 3a includes, for example, a lenticular lens 9a and a Fresnel lens 9b.

  The frames 8f and 8g are provided so as to surround the four sides of the lenticular lens 9a and the Fresnel lens 9b.

  The screen unit 3 is fixed at a position in contact with the frame 8 c of the cabinet 4.

  The screen unit 3 is attached (combined) to the cabinet 4 so that the screen unit 3 can move. That is, the screen unit 3 and the cabinet 4 are one unit. The screen unit 3 and the cabinet 4 are detachable structures.

  In the present embodiment, the cabinet 4 and the screen unit 3 have a frame structure, but a sheet metal may be used instead of the frame.

  Note that, as described above, in a large screen display system constructed by stacking a plurality of rear projection type video display devices vertically and horizontally, it is necessary to make the screen smaller than the external size of the cabinet. Therefore, the external size of the cabinet 4 and the screen unit 3 (transmission type screen 3a) is the difference between the expansion amounts of the cabinet 4 and the screen unit 3 (transmission type screen 3a) calculated from the linear expansion coefficients of the respective materials. It is the size to provide.

  2 and 3, the joint widths x and y are defined as described above in each of the adjacent rear projection type video display devices 100 (transmission type screen 3a). That is, the joint width x is a gap between two transmissive screens 3a adjacent in the left-right direction. The joint width y is a gap between two transmission screens 3a adjacent in the vertical direction.

  In this case, the difference in the external size of the cabinet 4 and the screen unit 3 in one rear projection image display device 100 needs to be half of x and y. That is, in one rear projection type video display device 100, joint widths x / 2 and y / 2 are required.

  FIG. 6 is a perspective view of the rear side of the rear projection type image display device 100. In FIG. 6, in order to make it easy to see the inside of the rear projection type image display device 100, a part of the surface of the cabinet 4 is made transparent.

  6 shows the configuration in the region R2, but the rear projection image display apparatus 100 according to Embodiment 1 is connected to the configuration in the region R2 (a flat cam 21 and a flat cam 21 described later). It is assumed that there is no long bar 10).

  FIG. 7 is an enlarged view of a region R1 in FIG.

  FIG. 8 is a diagram showing the configuration of FIG.

  With reference to FIGS. 6 to 8, the rear projection type image display apparatus 100 further includes a long bar 10, holding members 11 and 12, a flat cam 13, members 14 and 18, and a contact 15. Prepare.

  The holding members 11 and 12 are fixed to the inner surface of the cabinet 4. Specifically, the holding member 11 is fixed to a side surface 8 a (not shown) of the cabinet 4. The holding member 12 is fixed to the back surface (not shown) of the cabinet 4.

  The shape of the member 14 is L-shaped. The member 14 is fixed to the frame 8c with screws or the like.

  The long bar 10 is a long bar-shaped member. The long bar 10 is rotatably held by holding members 11 and 12.

  The flat cam 13 is provided so as to be in contact with a surface parallel to the transmissive screen 3a among the members 14 fixed to the frame 8c. The flat cam 13 is accommodated in the cabinet 4. Specifically, the cabinet 4 is combined with the screen unit 3 to cover the flat cam 13. The flat cam 13 is a plate-like cam in which the rotation shaft of the flat cam 13 is eccentric. The planar cam 13 is rotatably provided on a surface of the member 14 that is parallel to the transmission screen 3a.

  A contact 15 that is movable in the vertical direction is provided on the upper portion of the flat cam 13. Specifically, the contact 15 is provided with a long hole 16 extending in the vertical direction. The contact 15 is fixed by two screws 17 in the long hole 16. The screw 17 has a stepped shape. Therefore, the contact 15 can move in the vertical direction.

  The upper and lower shapes of the contact 15 are arcuate. Therefore, the upper part of the contact 15 makes point contact with the member 18.

  Here, the shape of the cross section in the left-right direction of the frame 8f of the screen unit 3 is L-shaped. That is, the end of the frame 8f on the transmissive screen 3a side is parallel to the transmissive screen 3a.

  The shape of the member 18 is L-shaped. The member 18 is fixed at a position where the contact 15 receives pressure from the contact 15 due to the vertical movement of the contact 15. Specifically, the member 18 is fixed to a portion of the frame 8f of the screen unit 3 that is parallel to the transmission screen 3a.

  When the screen unit 3 is attached (combined) to the cabinet 4, the member 18 contacts the upper end of the contact 15.

  One end of the long bar 10 is connected to the rotating shaft of the flat cam 13. Specifically, the end of the long bar 10 and the flat cam 13 are connected by fixing a portion where the central axis of the long bar 10 and the rotation axis of the flat cam 13 coincide with each other by welding or the like. Thereby, when the long bar 10 rotates, the flat cam 13 also rotates in synchronization.

  The other end of the long bar 10 penetrates the holding member 12 and protrudes to the outside of the cabinet 4. That is, the long bar 10 extends from the inside of the cabinet 4 to the outside of the back surface of the cabinet 4. Thereby, the operator can easily grasp the other end of the long bar 10 connected to the flat cam 13 from the outside of the cabinet 4. Therefore, the operator can easily perform an operation of rotating the long bar 10 (plane cam 13). That is, the long bar 10 is a rotation mechanism for rotating the flat cam 13 by an operation from the outside of the cabinet 4.

  The long bar 10 and other members connected to the planar cam 13 are disposed on the left and right side surfaces 8 a of the cabinet 4. That is, two planar cams 13 are provided on the left side surface 8a and the right side surface 8a of the cabinet 4, respectively. That is, the left and right two axes are used to adjust the movement of the screen unit 3.

  The vertical position of the screen unit 3 is set by the rotational state of the two flat cams 13. Hereinafter, one of the two planar cams 13 may be referred to as a planar cam 13-1. In the following, the other of the two planar cams 13 may be referred to as a planar cam 13-2.

  In the above configuration, when the operator grasps the other end of the long bar 10 connected to the flat cam 13 from the back surface of the cabinet 4 and rotates the long bar 10, the flat cam 13 rotates. In accordance with the rotation of the flat cam 13, the contact 15 disposed on the upper portion of the flat cam 13 moves along the extending direction of the long hole 16. That is, the contact 15 moves in the vertical direction according to the rotation of the flat cam 13. That is, the contact 15 is a member that moves up and down in accordance with the rotation of the flat cam 13.

  The member 18 is pressed from the contact 15 as the contact 15 moves in the vertical direction. That is, as the contact 15 moves in the vertical direction, the member 18 in contact with the contact 15 in the vertical direction moves in the vertical direction.

  Thereby, the screen unit 3 to which the member 18 is fixed can be moved in the vertical direction. That is, the member 18 moves the screen unit 3 in the vertical direction by receiving a pressure from the contact 15. In other words, the screen unit 3 moves in the vertical direction according to the rotation of the flat cam 13. That is, the screen unit 3 translates up and down. That is, the flat cam 13 is provided so as to move the screen unit 3 in a predetermined direction (vertical direction) as the flat cam 13 rotates.

  The configuration for moving the screen unit 3 in the vertical direction as described above is also referred to as a vertical translation shaft structure (vertical direction position adjustment mechanism).

  With the above configuration, the operator can use the long bar 10 to move the screen unit 3 up and down from the back side of the cabinet 4 of the rear projection type video display device 100 to the front side of the rear projection type video display device 100. Position adjustment in the direction can be easily performed.

  Further, as described above, the upper portion of the contact 15 is in point contact with the member 18. Therefore, the screen unit 3 is rotated and moved by changing the amount of vertical movement of the left and right end portions of the left and right screen units 3 while making the rotation states of the flat cam 13-1 and the flat cam 13-2 different. It is also possible to make it.

  With the above configuration, in the large screen display system 1000 configured by stacking a plurality of rear projection type video display devices 100, the gaps between the transmissive screens 3a can be easily separated from the back side of the cabinet 4 in arbitrary screen unit 3 units. It becomes possible to adjust. In other words, the gap between adjacent transmissive screens 3a, which is important in configuring the large screen display system 1000, can be easily (simplely) adjusted for each screen unit 3 unit. That is, the position of the screen unit 3 can be easily adjusted.

  In the present embodiment, the flat cam 13 is used as means for moving the screen unit 3 from the back surface of the cabinet 4. In addition, as a means for converting the rotational motion of the planar cam 13 into a reciprocating motion, there is another method using a public shaft gear or a staggered gear. However, these have the disadvantage that they are very expensive.

  In the present embodiment, the above-described configuration using the flat cam 13 can realize the position adjustment of the screen unit 3 of the rear projection type image display device 100 with the minimum number of parts and at a low cost.

  The shape of the flat cam 13 is determined from what is called a cam diagram in which the displacement s of the contact 15 is the vertical axis and the rotation angle of the long bar 10 is the horizontal axis. The outer shape of the flat cam 13 of the present embodiment is such that the vertical movement amount of the screen unit 3 (displacement amount of the contact 15) is a constant speed and the angle at which the long bar 10 is turned (rotational angle of the flat cam 13). Regardless, it is a smooth outer shape with the same amount of displacement.

  FIG. 9 is a view for explaining the shape of the flat cam 13.

  FIG. 9A is a cam diagram of the flat cam 13. The vertical axis represents the displacement amount of the contact 15. The horizontal axis is the rotation angle of the long bar 10.

  FIG. 9B shows the shape of the flat cam 13 according to the cam diagram of FIG. When a cam diagram is used, each value obtained by equally dividing the displacement amount s of the contact 15 by a constant angle is a radius obtained by equally dividing a circle whose radius is the minimum distance from the center of the cam rotation axis to the outer shape. Plot on the line. The shape of the planar cam 13 is determined by connecting the plotted positions with a curve. The method for determining the shape is shown, for example, in non-patent literature (Juyaku Oda, Yoshinori Murotsu, “Mechanical Design Engineering 1 [Elements and Design]” revised edition, Baifukan).

  The moving amount of the screen unit 3, that is, the displacement amount s of the contact 15 needs to have a dimension larger than the joint width calculated by the linear expansion coefficient of the material used for the screen unit 3 and the cabinet 4. That is, as shown in FIGS. 2, 3 and 4, the screen unit 3 needs to be displaced by y / 2 in the vertical direction.

<Embodiment 2>
In the first embodiment, the method of moving the screen unit 3 up and down (moving up and down) and the configuration of rotating the screen unit 3 by using the long bar 10 and the flat cam 13 on the left and right two axes of the cabinet 4 have been described.

  In the present embodiment, a description will be given of a structure in which the left-right translational adjustment of the screen unit 3 can be realized by using another shaft, a similar long bar 10 and a flat cam 21. That is, rear projection type image display apparatus 100 according to the present embodiment includes two flat cams for moving screen unit 3 in the vertical direction and one flat surface for moving screen unit 3 in the horizontal direction. Use with cam.

  FIG. 10 is an enlarged view of a region R2 in FIG.

  FIG. 11 is a diagram showing the configuration of FIG.

  Referring to FIGS. 6, 10, and 11, rear projection type image display apparatus 100 further includes planar cam 21, member 22, and wall portion 23.

  The member 22 is fixed to a portion parallel to the transmissive screen 3a in the frame 8f of the screen unit 3 by screws or the like, like the member 18 of FIG.

  The flat cam 21 is provided in a space formed by combining the screen unit 3 and the cabinet 4. That is, the cabinet 4 is combined with the screen unit 3 to cover the flat cam 21. The shape of the planar cam 21 is the same as that of the planar cam 13. The outer shape of the planar cam 21 is the same as the outer shape of the planar cam 13. That is, the flat cam 21 is a plate-like cam in which the rotation shaft of the flat cam 21 is eccentric.

  The flat cam 21 is rotatably provided on one surface of the member 22.

  In the screen unit 3, the wall portion 23 is fixed at a position that receives pressure from the flat cam 21 by the rotation of the flat cam 21. Specifically, the wall portion 23 is fixed to both sides of the member 22 in the left-right direction. That is, the wall portion 23 is fixed to the screen unit 3.

  One end of the long bar 10 is connected to the rotation shaft of the flat cam 21. Specifically, one end of the long bar 10 and the flat cam 21 are connected by fixing a portion where the central axis of the long bar 10 and the rotation axis of the flat cam 21 coincide with each other by welding or the like. Thereby, when the long bar 10 rotates, the flat cam 21 also rotates in synchronization.

  The other end of the long bar 10 connected to the flat cam 21 penetrates the holding member 12 and protrudes to the outside of the cabinet 4. That is, the long bar 10 extends from the inside of the cabinet 4 to the outside of the back surface of the cabinet 4. Thereby, the operator can easily grasp the other end of the long bar 10 connected to the flat cam 21 from the outside of the cabinet 4.

  Therefore, the operator can easily perform an operation of rotating the long bar 10 (plane cam 21). That is, the long bar 10 connected to the flat cam 21 is a rotation mechanism for rotating the flat cam 21 by an operation from the outside of the cabinet 4.

  FIG. 12 is a view showing a state in which the flat cam 21 is rotated by a predetermined angle. FIG. 12A is a diagram showing a state in which the planar cam 21 is rotated 90 degrees counterclockwise. FIG. 12B is a diagram showing a state in which the planar cam 21 is rotated 90 degrees clockwise.

  As the flat cam 21 rotates, the wall 23 receives pressure from the flat cam 21. By this pressing, the member 22 (screen unit 3) to which the wall portion 23 is fixed moves in the left-right direction. That is, the wall part 23 moves the screen unit 3 in the left-right direction by receiving pressure from the flat cam 21.

  For example, as shown in FIG. 12A, when the left wall portion 23 receives pressure from the flat cam 21, the screen unit 3 to which the member 22 is fixed moves to the left as viewed from the back of the cabinet 4. . Further, as shown in FIG. 12B, the screen unit 3 to which the member 22 is fixed moves in the right direction as viewed from the back of the cabinet 4 when the right wall portion 23 is pressed from the flat cam 21. .

  That is, the member 22 fixed to the frame 8f of the screen unit 3 moves in the left-right direction, so that the screen unit 3 can be moved in the left-right direction. With the above configuration, the flat cam 21 is provided so as to move the screen unit 3 in a predetermined direction (left-right direction) as the flat cam 21 rotates.

  As described above, the outer shape of the planar cam 21 is the same as the outer shape of the planar cam 13. Specifically, the shape of the outer shape of the flat cam 21 is such that the screen unit 3 moves to the left when viewed from the back of the cabinet 4 when the flat cam 21 rotates counterclockwise. The shape of the outer shape of the planar cam 21 is such that the screen unit 3 moves to the right when viewed from the back of the cabinet 4 when the planar cam 21 rotates clockwise.

  The configuration for moving the screen unit 3 in the left-right direction as described above is also referred to as a left-right translation shaft structure (left-right direction position adjustment mechanism). As shown in FIGS. 2 and 4, the screen unit 3 needs to be displaced by x / 2 in the left-right direction.

  In the present embodiment, the rear projection image display device 100 also has a mechanism for moving the screen unit 3 up and down or rotating by the flat cam 13 described in the first embodiment.

  As described above, the upper portion of the contact 15 makes point contact with the member 18. Therefore, even if the member 18 (screen unit 3) is translated in the left-right direction in accordance with the rotation of the planar cam 21, only the member 18 can be moved without changing the vertical position of the contactor 15.

  That is, the rear projection type image display device 100 of the present embodiment has a structure that can simultaneously realize the vertical and horizontal movements of the screen unit 3. The rear projection image display device 100 having such a configuration has the same effects as those of the first embodiment. That is, the operator can easily adjust the position of the screen unit 3 in the vertical direction and the horizontal direction from the back surface of the cabinet 4 of the rear projection type image display device 100 using the long bar 10. That is, the position of the screen unit 3 can be easily adjusted.

  Note that the rear projection type image display device 100 of the present embodiment may not have the configuration in the region R1 of FIG. 6 (the flat cam 13, the long bar 10 connected to the flat cam 13, etc.). In this case, the rear projection type image display apparatus 100 does not have a configuration for moving the screen unit 3 in the vertical direction, but has a configuration for moving the screen unit 3 in the horizontal direction.

<Modification 1 of Embodiment 2>
In the first modification of the second embodiment, a configuration for limiting the rotation angle of the planar cams 13 and 21 to a predetermined angle will be described.

  FIG. 13 is a view for explaining the operation of the flat cam 13 according to the first modification of the second embodiment. As shown in FIG. 13, a protrusion 19 is formed on the flat cam 13 according to the first modification of the second embodiment.

  The rear projection type image display device 100 according to the first modification of the second embodiment further abuts against the protrusion 19 when the flat cam 13 rotates, and a wall portion for limiting the rotation angle of the flat cam 13 to a predetermined angle. 20.

  Specifically, the wall portion 20 is fixed to the left end and the right end of the member 14.

  FIG. 13A shows a state in which the counterclockwise rotation of the planar cam 13 is restricted by the protrusion 19 coming into contact with the right wall 20. FIG.13 (b) shows the state which the plane cam of Fig.13 (a) rotated 90 degree | times clockwise. FIG. 13C shows a state in which the clockwise rotation of the planar cam 13 is restricted by the protrusion 19 coming into contact with the left wall 20. With the above configuration, the planar cam 13 can be prevented from continuing to rotate forever.

  Although FIG. 13 shows a configuration that restricts the rotation of the planar cam 13 on the vertical translation shaft, a wall portion having the same configuration as described above may be provided on the lateral translation shaft using the planar cam 21. In this case, as in FIG. 13, the planar cam 21 is formed with a protrusion 19. In this case, the rear projection type image display apparatus 100 further includes a wall portion that comes into contact with the protrusion 19 when the flat cam 21 rotates and limits the rotation angle of the flat cam 21 to a predetermined angle.

  With the configuration described above, in the first modification of the second embodiment, the planar cams 13 and 21 can be prevented from continuing to rotate forever. Thereby, when adjusting the up-down position and the left-right position of the screen unit 3, the maximum position of the adjustment width can be easily grasped. Therefore, the adjustability of the screen unit 3 can be improved.

<Modification 2 of Embodiment 2>
In the above description, the configuration in which the screen unit 3 is moved in the vertical direction, the configuration in which the screen unit 3 is moved in the horizontal direction, and the configuration in which the screen unit 3 is rotated have been described. When the large screen display system 1000 is configured using a plurality of rear projection type video display devices 100, after the large screen display system 1000 is operated, a certain screen unit 3 is removed from the cabinet 4, and the screen unit 3 is again installed in the cabinet 4. Work such as installation may be necessary. The case where the operation is necessary is, for example, a case where the surface of the screen unit 3 (transmission type screen 3a) is damaged. Moreover, when the said operation | work is required, it is a case where the dust inside the screen unit 3 is cleaned, for example.

  At that time, when the flat cam having the configuration of the above embodiment is fixed at a predetermined position and maintains a state where it cannot rotate, the screen unit 3 is removed when the screen unit 3 is attached to the cabinet 4 again. It is necessary to arrange the screen unit 3 at the position. In this case, the attachment of the screen unit 3 is very difficult in terms of work and is a careful work.

  Here, for example, when a certain screen unit 3 itself is replaced in the large screen display system 1000, it is assumed that the outer size of the replacement screen unit 3 is slightly larger than the screen unit 3 before replacement. In this case, since the screen unit 3 is already arranged around the cabinet 4 from which the screen unit 3 is removed, there is a possibility that the replacement screen unit 3 cannot be assembled in the large screen display system 1000.

  Therefore, when the screen unit 3 of a certain rear projection type image display device 100 is removed from the cabinet 4, the fixed position of the flat cam needs to be reset every time.

  Specifically, for example, when there is almost no force applied to the flat cam 13 by removing the screen unit 3 of the rear projection type image display device 100 from the cabinet 4, the position of a part of the flat cam 13 becomes a predetermined position. Thus, a weight is provided on the flat cam 13. That is, the planar cam 13 has almost no force applied to the planar cam 13, and when the planar cam 13 is in a rotatable state, the planar cam 13 is positioned so that a part of the planar cam 13 becomes a predetermined position. A weight 24 for rotating 13 is provided.

  FIG. 14 is a view for explaining the operation of the flat cam 13 provided with the weight 24.

  The flat cam 13 is a cam for moving the screen unit 3 in the vertical direction. A weight 24 is provided on a part of the flat cam 13. When the planar cam 13 is rotatable, the weight 24 is provided at a position where the planar cam 13 is in the state shown in FIG.

  With the above configuration, in a state where the screen unit 3 is not attached to the cabinet 4, the planar cam 13 naturally becomes the state shown in FIG. That is, when the screen unit 3 is not attached to the cabinet 4, the position of the screen unit 3 is the lowest position in the range in which the screen unit 3 can move in the vertical direction.

  It should be noted that the shape of the flat cam 13 in the second modification of the second embodiment needs to be a shape for the weight 24 to naturally return the position of the flat cam 13 to a predetermined position. That is, when the state of the flat cam 13 is the state shown in FIG. 14A, the position of the screen unit 3 is the lowest position in the range in which the screen unit 3 can move in the vertical direction. It is necessary to make it a simple shape.

  14 (b) and 14 (c) show a state in which the flat cam 13 is fixed at a predetermined position by the operation of the long bar 10 in the state where the screen unit 3 is attached to the cabinet 4. FIG. Indicates.

  As for the flat cam 21 for moving the screen unit 3 in the left-right direction, a weight 24 is provided at a place where the flat cam 21 naturally rotates so that the screen unit 3 is at the center position in the left-right direction of the cabinet 4. Is provided. That is, the planar cam 21 has almost no force applied to the planar cam 21, and when the planar cam 21 is in a rotatable state, the planar cam 21 is positioned so that a part of the planar cam 21 becomes a predetermined position. A weight 24 for rotating 21 is provided.

  With the above configuration, when the screen unit 3 is not attached to the cabinet 4, each rear projection video display device 100 in the large screen display system 1000 always places the screen unit 3 at the lowest position, and It will be in the state attached to the center position of the left-right direction.

  Thereby, it becomes possible to easily fix the screen unit 3 to be attached again to the cabinet 4 regardless of the position of the screen unit 3 adjacent to the place for attaching the screen unit 3.

  In the above description, the weight is provided on the planar cam so that each planar cam rotates naturally in the intended direction, but the present invention is not limited to this configuration. For example, without using a weight, only the shape of the planar cam may be used, and the same function as the planar cam provided with the weight 24 may be provided. That is, when the flat cam is in a rotatable state, the flat cam may have a shape that rotates the flat cam so that a part of the flat cam is at a predetermined position. The plane cams are the plane cams 13 and 21.

  For example, the shape of the planar cam may be irregular, thereby decentering the position of the center of gravity of the planar cam and having the same function as that provided with a weight. Further, for example, the center of gravity of the planar cam may be decentered by making the thickness of the planar cam non-uniform so as to have a function similar to that provided with a weight.

  In addition, when a screen unit 3 is not attached to the cabinet 4 by applying tension to the flat cam or the long bar by using a tension spring or the like without using a weight, the flat cam will naturally rotate. It is good also as a simple structure. In this case, a spring that rotates the planar cam is attached to the planar cam so that a part of the planar cam is in a predetermined position when the planar cam is in a rotatable state. The plane cams are the plane cams 13 and 21.

<Modification 3 of Embodiment 2>
In the large screen display system 1000 using the plurality of rear projection type image display devices 100, the screen unit 3 is fixed and adjusted in position only when the large screen display system 1000 is installed. In rare cases, the screen unit 3 may be replaced, but basically, the position adjustment of the screen unit 3 is performed only once in the product lifetime.

  In the said embodiment and its modification, the structure which uses the long bar 10 as a means to rotate the plane cams 13 and 21 from the back surface of the cabinet 4 was demonstrated. However, it is wasteful in cost to arrange three long bars 10 for each rear projection type video display device for once in the life of the product.

  In the third modification of the second embodiment, a bolt 25 shown in FIG. 15 is used instead of the long bar 10 described above. The bolt 25 is disposed inside the cabinet 4. That is, the bolt 25 is accommodated in the cabinet 4. The length of the bolt 25 is the minimum length necessary for attaching the flat cams 13 and 21.

  The bolt 25 is connected to the planar cam by the tool 26 so as to rotate the planar cam. The plane cams are the plane cams 13 and 21. The tool 26 is a dedicated tool having a length from the outside of the back surface of the cabinet 4 to the bolt 25.

  Specifically, one end of each bolt 25 is connected to the rotation shaft of the flat cams 13 and 21, as with the long bar 10.

  The operator rotates the planar cams 13 and 21 in the same manner as in the first and second embodiments by holding the end of the tool 26 protruding from the back surface of the cabinet 4 and rotating the tool 26 (bolt 25). Can be made. Thereby, the position adjustment of the screen unit 3 can be performed easily. That is, the bolt 25 is a rotation mechanism for rotating the flat cam by an operation from the outside of the cabinet 4. The plane cams are the plane cams 13 and 21.

  For example, it is assumed that the bolt head shape of the bolt 25 is a hexagonal shape. In this case, the tool 26 is a tool that can turn the hexagonal bolt 25. Thereby, the length of the rod of the central axis of the flat cam provided in each rear projection type image display device 100 and the length of the bolt 25 can be shortened. As a result, it is possible to provide the rear projection type image display device 100 having an economical position adjustment function of the screen unit 3.

<Modification 4 of Embodiment 2>
In the first and second embodiments and the modifications thereof, the configuration in which the planar cams 13 and 21 are rotated from the back surface of the cabinet 4 has been described. However, each configuration requires at least two workers, a person who holds the position of the screen unit 3 on the front surface and a person who fixes the screen unit 3 to the cabinet 4 with screws or the like. Therefore, a configuration method in which the position adjustment of the screen unit 3 of the rear projection type image display apparatus 100 can be performed by one person will be described.

  FIG. 16 is a perspective view of the rear side of the rear projection type image display apparatus 100 according to the fourth modification of the second embodiment.

  Referring to FIG. 16, the rear projection type video display apparatus 100 according to the fourth modification of the second embodiment is compared with the rear projection type video display 100 according to the third modification of the second embodiment. The difference is that an electric motor 27 is used instead of the above. The rest of the configuration of rear projection type video display apparatus 100 according to Modification 4 of Embodiment 2 is the same as that of rear projection type video display apparatus 100 according to Modification 3 of Embodiment 2, and therefore detailed description will not be repeated. .

  The electric motor 27 is a motor for rotating the bolt 25. That is, the electric motor 27 is a rotation mechanism for rotating the flat cams 13 and 21. The electric motor 27 is accommodated in the cabinet 4.

  The electric motor 27 is attached to the end of the bolt 25 in order to rotate the bolt 25. The electric motor 27 is supplied with electric power from the projection unit 1 and the rotation of the motor is controlled.

  With the above configuration, the operator can control the electric motor 27 from the screen unit 3 side while viewing the menu of the image projected from the projection unit 1 onto the transmission screen 3a. Therefore, the position of the screen unit 3 of the rear projection type image display device 100 can be adjusted by one worker.

<Modification 5 of Embodiment 2>
In the fourth modification of the second embodiment, the electric motor 27 is attached to the adjustment shaft (bolt 25) of each screen unit 3, thereby adjusting the position of the screen unit 3 of the rear projection type image display device 100 by one worker. The configuration that can be performed is described. However, in this configuration, it is necessary to provide the three electric motors 27 in each rear projection image display device 100. As described in the third modification of the second embodiment, the use of the expensive electric motor 27 for the position adjustment only once in the product lifetime is excessive cost for manufacturing the rear projection type image display apparatus 100. Will occur.

  FIG. 17 is a perspective view of the rear side of the rear projection type image display apparatus 100 according to the fifth modification of the second embodiment.

  Referring to FIG. 17, rear projection type video display apparatus 100 according to Modification 5 of Embodiment 2 has the same configuration as rear projection type video display apparatus 100 of FIG.

  In the modified example 5 of the present embodiment, only when the position of the screen unit 3 is adjusted, the electric motor 27 as a jig is temporarily attached to the end of the long bar 10 protruding from the cabinet 4. That is, an electric motor 27 for rotating the long bar 10 is temporarily attached to the long bar 10.

  With this configuration, the position of the screen unit 3 of the rear projection type image display device 100 can be adjusted by one worker as in the fourth modification of the second embodiment.

<Modification 6 of Embodiment 2>
FIG. 18 is a rear perspective view of the rear projection type image display apparatus 100 according to the sixth modification of the second embodiment.

  Referring to FIG. 18, rear projection type video display apparatus 100 according to Modification Example 6 of Embodiment 2 is compared with rear projection type video display apparatus 100 of Modification Example 3 (FIG. 15) of Embodiment 2. Furthermore, the point provided with the long bar 28 and the electric motor 27 is different. Since the other configuration of the rear projection type image display apparatus 100 according to the sixth modification example of the second embodiment is the same as that of the rear projection type video display apparatus 100 according to the third modification example (FIG. 15) of the second embodiment, a detailed description will be given. Will not repeat.

  A long rod 28 for rotating the bolt 25 is attached to the bolt 25 connected to each of the flat cams 13 and 21. The long bar 28 has a length from the outside of the back surface of the cabinet 4 to the bolt 25.

  An electric motor 27 for rotating the long bar 28 is attached to the end of the long bar 10 protruding from the cabinet 4. That is, an electric motor 27 for rotating the long bar 28 is attached to the long bar 28.

  With this configuration, the position of the screen unit 3 of the rear projection type image display device 100 can be adjusted by one worker as in the fourth modification of the second embodiment.

  It should be noted that within the scope of the invention, the present invention can be freely combined with each embodiment and modification of the embodiment, or can be appropriately modified and omitted with each embodiment and modification of the embodiment. Is possible.

  The present invention can be used as a rear projection type image display device capable of easily adjusting the position of the screen unit.

  DESCRIPTION OF SYMBOLS 1 Projection unit, 2 Reflecting mirror, 3 Screen unit, 3a Transmission type screen, 4 Cabinet, 10,28 Long bar, 11,12 Holding member, 13,21 Planar cam, 14,18,22 Member, 15 Contact, 19 Projections, 20, 23 Walls, 24 Weights, 25 Volts, 26 Tools, 100 Rear projection video display, 1000 Large screen display system.

Claims (13)

A rear projection type image display device in which an image is projected from the back of the screen unit,
A flat cam provided rotatably and having an eccentric rotation shaft;
A cabinet that is combined with the screen unit and covers the flat cam;
The planar cam is provided to move the screen unit in a predetermined direction by rotating the planar cam,
The rear projection type image display device further includes:
A rear projection type image display device comprising a rotation mechanism for rotating the planar cam by an operation from outside the cabinet. The predetermined direction is a vertical direction or a horizontal direction,
A plurality of the planar cams are provided,
A first planar cam among the plurality of planar cams is provided to move the screen unit in the vertical direction,
The rear projection image display device according to claim 1, wherein a second flat cam among the plurality of flat cams is provided to move the screen unit in the left-right direction. The predetermined direction is a vertical direction or a horizontal direction,
The rotating mechanism is a long bar connected to the rotating shaft of the planar cam;
The rear projection type image display device according to claim 1, wherein the long bar extends from the inside of the cabinet to the outside of the back surface of the cabinet. The rear projection type image display device according to claim 3, wherein an electric motor for rotating the long bar is temporarily attached to the long bar. The predetermined direction is a vertical direction,
The rear projection type image display device further includes:
A first member that moves up and down in response to rotation of the planar cam;
In the screen unit, comprising: a second member fixed at a position to receive pressure from the first member by movement of the first member in the vertical direction;
The rear projection type image display device according to any one of claims 1 to 4, wherein the second member moves the screen unit in the up-down direction by receiving a pressure from the first member. The predetermined direction is a left-right direction,
The rear projection type image display device further includes:
In the screen unit, the first wall portion fixed to a position to receive pressure from the flat cam by the rotation of the flat cam,
The rear projection type image display device according to claim 1, wherein the first wall portion moves the screen unit in the left-right direction by receiving pressure from the flat cam. A protrusion is formed on the planar cam,
The rear projection type image display device further includes:
The rear projection type image according to any one of claims 1 to 6, further comprising a second wall portion that comes into contact with the protrusion during rotation of the flat cam and limits a rotation angle of the flat cam to a predetermined angle. Display device. The planar cam is provided with a weight for rotating the planar cam so that a part of the planar cam becomes a predetermined position when the planar cam is in a rotatable state. The rear projection type image display device according to any one of the above. The planar cam has a shape for rotating the planar cam so that a part of the planar cam is in a predetermined position when the planar cam is rotatable. The rear projection type image display device according to item. The spring that rotates the planar cam is attached to the planar cam so that a part of the planar cam is in a predetermined position when the planar cam is rotatable. The rear projection type image display device according to claim 1. The rotation mechanism is a bolt accommodated in the cabinet,
The said bolt is connected to this plane cam so that the said plane cam may be rotated with the tool which has the length from the outer side of the back surface of the said cabinet to the said bolt. The rear projection type image display device according to item. The rear projection type image display device according to claim 1, wherein the rotation mechanism is an electric motor that is housed in the cabinet and rotates the planar cam. The rotation mechanism is a bolt accommodated in the cabinet,
The bolt is connected to a rotating shaft of the planar cam;
The bolt has a length from the outside of the back of the cabinet to the bolt, and is attached with a long bar for rotating the bolt,
The rear projection type image display device according to claim 1, wherein an electric motor for rotating the long bar is attached to the long bar.

Images