JP2009524079A - Compatible projection television screen mounting clamp - Google Patents

Abstract

A strip mount on top and bottom screen mounting brackets is disclosed that absorbs screen tolerances while holding the projection display screen in place. The strip mount has a C-shaped cross section that holds the screen in place. The screen mounting bracket is an elongated and highly rigid member.

Description

  The present invention relates generally to projection displays, and more particularly to details for mounting a projection display screen.

  Projection display televisions are becoming widely used. These projection display television cabinets are typically made from plastic. A problem that projection display televisions typically have is to keep the top edge of the screen straight and in place. Plastic cabinets provide a good appearance, but have a tendency to hang down along the upper edge, degrading the ability to keep the upper edge straight and in place. This is a more severe problem with projection display televisions that incorporate up-angle optics. This is because such televisions require a more accurate screen position relative to the optical element.

  Many projection televisions have the problem of mounting screens due to large dimensional tolerances and variations. A particular problem is the screen thickness tolerance. Screens are typically made from multiple pieces that are laminated and / or taped together. Another problem is that the width and height of the screen can vary greatly with temperature and humidity. The screen needs to be able to expand in the width and height directions, otherwise it will expand and overhang. Due to the steep up-angle associated with recent projection televisions, screen bulges can cause noticeable image distortion. Typically, these screens are held in grooves in metal wood or plastic. The groove has space for expansion and restraint of the screen and mating parts. Loose fitting is acceptable for conventional projection television displays and on-axis microdisplay sets because the final image geometry is not distorted.

  However, due to the steep up-angle associated with the light path of projection displays in recent years, changes in the position of the screen surface cause significant distortion in the image geometry.

  The present invention provides a strip mount on top and bottom screen mounting brackets that absorbs screen tolerances while holding the projection display screen in place. The strip mount has a C-shaped cross section that holds the screen in place. The screen mounting bracket is an elongated and highly rigid member.

  Exemplary embodiments of the invention will now be described with reference to the accompanying drawings.

  The present invention, as shown in FIGS. 1A to 3C, keeps the top of the screen frame of the projection display television straight and allows the screen assembly to be removed from the front side without the use of screws from the rear. A metal hinge mechanism is provided.

  An exemplary projection display television is shown in FIGS. 1A-3C. The screen mounting bracket 50 has top and bottom aluminum extrusions that are continuous reinforcement members for the screen frame 12. Aluminum extrusions are inexpensive to manufacture and provide good dimensional stability and stiffness characteristics. Strip mounts 55A and 55B attached to the top and bottom screen mounting brackets 50 are used to hold the projection display screen 10 in place.

  The screen mounting bracket 50 </ b> A includes a locking portion (anchor portion) 51 attached to the screen frame 12 and a “T” -shaped detail 56 for receiving the strip mount 55. In the exemplary embodiment, the locking portion 51 fits into a protrusion and / or recess in the screen frame 12 to form a press fit into the screen frame 12.

  The strip mount 55A is attached to the “T” shaped detail 56 of the screen mounting bracket 50A, while the strip mount 55B is attached to the “T” shaped detail 56 of the screen mounting bracket 50B. In the exemplary embodiment, strip mounts 55A, 55B have a C-shaped cross section and may be made from a flexible plastic extrusion. When fitted to the screen frame 12, there is a space for absorbing the thickness of the screen between the protrusions of the extruded product and the frame. The cross-section of the strip mount is such that the C-shaped cross-section allows the cross-section to bend and maintain preload against the screen. The strip mounts 55 </ b> A and 55 </ b> B are continuous and finally come into pressure contact with the screen 10.

  The top and bottom screen mounting brackets 50A, 50B are metal extrusions and have mating “T” shaped details 56 (FIG. 3C) to capture the strip mounts 55A, 55B. This mating detail 56 is such that the strip mounts 55A, 55B push in the metal extrusions. When pressure is present against the strip mounts 55A, 55B, the C-shape opens and collapses when the height of the extruded product is needed, absorbing the variation in screen thickness while maintaining a reasonable force. The plastic or rubber-based material used for the strip mounts 55A, 55B is selected to be chemically compatible with the material of the screen 10 and has surface hardness characteristics that prevent wear on the screen material during transport and vibration. Is selected. The linear extrusion 58 incorporated within the strip mount 55 functions as a “light strip” that reduces unwanted light reflections onto the screen 10. Similar results can be obtained by incorporating multiple small strips into the side wall of the strip mount rather than a large linear extrusion.

  The screen mounting brackets 50A and 50B and the strip mounts 55A and 55B extend substantially in the elongated direction (longitudinal direction) (that is, the entire width of the screen frame 12), and the rigidity of the entire upper edge of the screen frame 12 is increased. And hold the top edge of the screen 10 straight in place.

  The cabinet may be made of plastic, as is typical for projection display televisions. These brackets 50 in the form of extruded products constitute a structural member having a low cross section along the upper edge of the cabinet 20 when mounted in a plastic cabinet. The structural member can be tied to other structural members of the cabinet 20 to help maintain the critical position of the screen frame 12. Aluminum extrusions are inherently straight, in addition to being very low cost to finish and are rigid and stable compared to other parts such as plastic extrusions, molded sheet metal, wood or molded plastic There is sex.

  The above illustrates some of the possibilities for implementing the present invention. Many other embodiments are possible within the scope of the present invention. For example, the exemplary embodiment shows an aluminum extrusion for a structural member, but the concept is applicable to roll-formed sheet metal and sheet metal parts produced with a progressive die. Therefore, the above description is to be regarded as illustrative rather than limiting, and the scope of the present invention is intended to be provided by the appended claims along with the full scope of equivalents thereof.

1 is a front perspective view of a projection display television according to an exemplary embodiment of the present invention. FIG. 1B is a rear perspective view of the projection display television of FIG. 1A. FIG. FIG. 1B is a partial rear perspective view of the projection display television of FIGS. 1A and 1B showing an upper extrusion according to an exemplary embodiment of the present invention. FIG. 3 is an exploded side view of a plastic screen frame, extrusion, and strip mount. FIG. 3B is a cross-sectional view of the plastic screen frame, extruded product, and strip mount of FIG. 3A. Sectional drawing of the extruded product and strip mount of FIG.

Claims (12)

A bracket for mounting the projection display screen to the cabinet from its front side,
A screen bracket attached to a screen frame on which the screen is mounted;
A bracket including a strip mount attached to the screen bracket and in contact with the screen.   The bracket according to claim 1, wherein the screen bracket is continuous.   The bracket according to claim 2, wherein the screen bracket has a constant cross section along a longitudinal direction.   The bracket according to claim 1, wherein the strip mount and the screen bracket are extruded products.   The bracket according to claim 1, wherein the screen bracket is made of aluminum.   The bracket according to claim 1, wherein the strip mount is C-shaped. A projection display,
Cabinet,
A screen mounted on a screen frame;
A bracket for mounting the screen frame,
A projection display, wherein the bracket is attached with a strip mount that contacts the screen.   The projection display according to claim 7, wherein the bracket is continuous.   The projection display according to claim 8, wherein the bracket has a constant cross section along a longitudinal direction.   The projection display according to claim 7, wherein the strip mount and the bracket are extrusions.   The projection display according to claim 7, wherein the bracket is made of aluminum.   The projection display according to claim 7, wherein the strip mount is C-shaped.

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