JP5106249B2 - Rear projection image display device - Google Patents

Description

  The present invention relates to a rear projection type video display device that projects an image from a projection unit from the rear side of a transmissive screen unit, and in particular, a so-called multivision in which a plurality of such rear projection type video display devices are arranged to constitute a large screen. It is suitable for a projector for use.

  In recent years, large displays are attracting attention for monitoring and information applications. As a method for forming this type of large screen, multi-vision in which a plurality of rear projection type video display devices (so-called rear projection type projectors) are combined vertically and horizontally is common. This rear projection type image display device is a device that projects an image from a projection unit installed on the rear side onto a transmission type screen unit.

  As a conventional multi-vision type rear projection projector, there is a structure as disclosed in Patent Document 1, for example.

  That is, according to the structure disclosed in Patent Document 1, a screen member configured by superimposing a plurality of transparent sheet-like members, and a support (light-shielding plate) that supports the screen member on the back surface of the screen member, A configuration is disclosed in which a projection unit that projects an image toward the back surface of a screen member is provided, and a plurality of sheet-like members constituting the screen member are connected to each other by attaching an adhesive tape to a side surface of the screen member. . In addition, as the plurality of sheet-like members described above, a lenticular sheet for image formation and diffusion and a Fresnel lens for collimating light from the light source are stacked, and a reinforcing plate for mechanically reinforcing these is further stacked. It becomes the composition.

JP 2000-162709 A

  According to the structure of the core unit disclosed in Patent Document 1, a resin-made holding portion (light-shielding plate) having a light-shielding property is fixed to the outer periphery of a screen member made of a resin lenticular sheet, a Fresnel lens, or the like with an adhesive or a tape. Has been. And the holding part (light-shielding plate) is attached to the support frame body which consists of metal structures, a frame member, etc., and the screen member is hold | maintained.

  In particular, in a monitoring application using a multi-screen, a large screen image is displayed by connecting a plurality of the above-described image display devices (core units) vertically and horizontally. In this case, a large screen image is projected by projecting images to all four sides (upper, lower, left, and right) of the screen member in each image display device, so the joint width between the screens by each screen member (the width at which no image appears) is as much as possible. It needs to be small.

  Therefore, in the mounting structure of each screen member itself, it is required in terms of performance whether the joint width can be reduced and the holding strength can be increased.

  In addition, the linear expansion coefficient of resin screen members and holding parts (light-shielding plates) is larger than the linear expansion coefficient of metal support frames, so changes in the usage environment (temperature) When a change in humidity occurs, a difference in dimensional change (stress) occurs due to a difference in expansion and contraction between the resin and the metal. The stress is warped on the lenticular sheet and the Fresnel lens, and appears as a deflection phenomenon (screen deterioration of the screen), or as a holding strength defect such as adhesive peeling of the holding portion (light-shielding plate), tape peeling or floating.

  In order to reduce the effect of this phenomenon, the holding part (light-shielding plate) can change freely in response to environmental changes and absorb the stress due to dimensional differences, thereby reducing the effect on the lenticular sheet and Fresnel lens. And the above-mentioned holding strength defect can be improved.

  Particularly in large screens (67-inch size, 80-inch size, etc.), the expansion / contraction difference between the low temperature and high temperature is about 7 to 10 mm, and a large dimensional change occurs. For this reason, there is a demand for how to absorb the dimensional change in a large screen and to make the structure free from mechanical reliability.

  Therefore, in view of the above problems, the present invention reduces the warpage and deflection of the screen unit by reducing the stress caused by the environmental change between the screen unit and the screen support frame that supports the screen unit. Another object of the present invention is to provide a projection-type image display device that is improved in adhesion peeling failure and the like.

The present invention relates to a transmissive screen unit configured by superimposing a plurality of screen constituent members, a screen support frame that supports the transmissive screen unit via a screen holding member, and an image projected onto the transmissive screen unit. In the rear projection type image display apparatus that projects an image projected from the projection unit from the rear surface of the transmissive screen unit, one end of the screen holding member is inserted into the concave groove of the screen support frame. while being supported Te, the other end of the screen holding member is adhered around the transmission screen units, the transmission type screen units is supported, the screen holding member have a flexible, said screen holding member Is formed of two types of materials, a rigid material and a flexible material. A flexible material is disposed on at least the inner surface side of the screen holding member, and is screwed into the one end of the screen holding member in the concave groove of the screen holding frame. comprising a stop fixed portion, the screwing part with is fixed to the recessed groove pressed against without being penetrated by a screw, that you have been formed of a material that the screwing unit has a flexible Features.

  According to the projection display apparatus of the present invention, one end of the screen holding member is supported by the screen support frame, and the other end of the screen holding member is bonded to the periphery of the transmissive screen unit. Since the screen unit is supported and the screen holding member has a flexible structure, between the transmissive screen unit and the screen support frame due to an environmental change such as a use environment or a storage environment, Even when a dimensional change difference (stress) due to expansion / contraction difference occurs, the dimensional change difference can be effectively absorbed by the flexural deformation of the flexible screen holding member. Since the stress caused by environmental changes can be reduced, the warpage and deflection of the screen unit can be reduced, and the adhesion peeling failure can be improved. Door can be. Therefore, the screen unit can be stably held.

<Embodiment 1>
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a so-called multi-projector 2 for multi-vision configured by combining four rear-projection image display devices 1 vertically and horizontally. .

  As shown in FIGS. 2 to 4, each rear projection type image display device 1 includes a cabinet 4 constituting the casing of the device 1, a transmissive screen unit 5 disposed on the front surface, and a transmissive screen unit 5. A projection unit 6 that projects an image from the back, an outline adjustment unit (not shown), and the like are provided. As the projection unit 6, a generally known unit having a rear projection type image display function may be adopted as appropriate.

  The screen unit 5 is configured by superimposing a plurality of light-transmissive sheet-like screen constituent members. In this embodiment, as shown in FIGS. 3 and 4, the screen unit 5 is arranged on the foremost side. The lenticular sheet 7 and a Fresnel lens 8 stacked on the back side of the lenticular sheet 7 are configured. The lenticular sheet 7 and the Fresnel lens 8 are made of acrylic resin, for example.

  The cabinet 4 is formed of a metal material such as aluminum, and a screen support frame body 9 formed of a metal material such as aluminum is provided in a rectangular ring shape at the edge of the opening side of the cabinet 4. . Further, as shown in FIG. 3, the screen support frame body 9 is provided with a mounting portion 9b having a concave groove portion 9a provided along the circumferential direction at a front end portion thereof.

  The screen unit 5 is supported by the screen support frame 9 via the screen holding member 10. The screen holding member 10 has a function as a light shielding plate. As shown in FIG. 3, the screen holding member 10 is a base portion at one end inserted into the recessed groove portion 9 a of the mounting portion 9 b of the screen support frame body 9. 10a, a screen mounting portion 10b at the other end that contacts the screen unit 5 and is bonded to the screen unit 5 by the adhesive sheet 11, and an intermediate connecting portion 10c positioned between the base portion 10a and the screen mounting portion 10b. I have.

  Further, as shown in FIG. 4, a plurality of insertion holes 9 c into which the screw shafts of the fixing screws 12 are inserted are formed in the mounting portion 9 b of the screen support frame body 9 with appropriate intervals in the circumferential direction. ing. When the base portion 10a of the screen holding member 10 is inserted into the recessed groove portion 9a of the mounting portion 9b, a screw fixing portion 10d is provided at a portion corresponding to the position of the insertion hole 9c in the base portion 10a.

  In the present embodiment, the base portion 10a and the screen mounting portion 10b of the screen holding member 10 are formed of, for example, an acrylic material similar to that of the lenticular sheet 7 and the Fresnel lens 8 as a rigid material, and the intermediate connecting portion. 10c and the screwing fixing part 10d are formed of, for example, a flexible elastic elastomer material as a flexible material. Such a screen holding member 10 may be manufactured by, for example, two-color molding in which an acrylic material and an elastomer material are simultaneously extruded.

  Further, in the present embodiment, as shown in FIG. 3, the intermediate connecting portion 10 c is arranged over substantially the entire area exposed on the inner surface side of the screen holding member 10. In addition, this cross-sectional shape is made into the same shape on four sides of the upper and lower sides and the left and right sides.

  The pressure-sensitive adhesive sheet 11 has a pressure-sensitive adhesive layer on one side, and as shown in FIGS. 3 and 4, the lenticular sheet 7 and the Fresnel lens 8 that are stacked on each other, and the screen holding member that is in contact with the Fresnel lens 8. The adhesive sheet 11 is bonded to the outer peripheral surface of the adhesive 10 via an adhesive layer.

  Further, screen holding metal fittings 13 are provided, each of which is formed by appropriately bending a sheet metal material having an appropriate width corresponding to the position where each fixing screw 12 is attached. As shown in FIG. 3, each screen holding metal 13 is engaged with the mounting portion 9 b together with the base portion 10 a and the other end portion with the fixing screw 12 with one end portion being locked to the front side edge of the screen unit 5. The structure is tightened.

  For example, in the present embodiment, the screen holding metal 13 is configured to be attached at three positions on the upper and lower portions of the screen unit 5 and at one place on each of the left and right sides. Further, it is preferable that the mounting positions of the screen holding metal fittings 13 are positions shifted from each other in the left-right direction at the upper part and the lower part, and positions shifted from each other in the vertical direction at the left and right side parts. That is, as shown in FIG. 1, when the rear projection type video display devices 1 are arranged side by side vertically and horizontally, the screen holding metal fittings 13 are not displaced and do not overlap with each other. The joint widths WA and WB which are the distances between the screen units 5 in 1 can be made narrower.

  Such vertical and horizontal joint widths WA and WB are the adhesive sheet 11 for holding each screen unit 5, the thickness of the screen holding bracket 13, the temperature / humidity of the transmission screen unit 5, etc. It is set so as to include an expansion / contraction tolerance determined in consideration of a dimensional change caused by an environmental change.

  The present embodiment is configured as described above, and the dimensions due to the expansion / contraction difference between the screen unit 5 and the screen support frame 9 due to environmental changes such as temperature and humidity in the use environment and the storage environment. Even when a change difference (stress) occurs, the screen holding member 10 that holds the screen unit 5 exhibits flexibility by the intermediate connecting portion 10c, and each screen holding metal fitting 13 can be flexibly deformed. Therefore, the difference in dimensional change can be effectively absorbed by the deflection deformation following the up and down and left and right directions of the screen holding member 10 and the screen holding metal 13. As a result, the stress caused by the environmental change can be reduced, so that the warpage and deflection of the lenticular sheet 7 and the Fresnel lens 8 in the screen unit 5 can be reduced, and the adhesion peeling failure of the adhesive sheet 11 can be improved. . Here, there is an advantage that the screen unit 5 can be stably held.

  In addition, since the screen holding member 10 is configured to be molded in two colors using a material having rigidity and a material having flexibility, the holding strength of the screen unit 5 can be stably maintained by the base portion 10a and the screen mounting portion 10b made of the material having rigidity. The intermediate connecting portion 10c made of a flexible material can be flexibly followed by the shrinkage / expansion of the screen unit 5 caused by environmental changes such as temperature and humidity, and problems such as adhesion peeling are effective. Can be resolved.

  Further, as shown in FIG. 3, since the intermediate connecting portion 10c made of a flexible material is arranged over substantially the entire area exposed to the inner surface side of the screen holding member 10, the projection unit 6 has an advantage that it can diffuse and attenuate the light (unnecessary light) that hits the screen holding member 10 and is reflected on the screen by the light projected from 6, and the screen unit 5 can improve the video performance.

  Further, the screw fixing portion 10d in the screen holding member 10 is molded from a flexible material, and the screen holding member 10 is fixed by screwing the fixing screw 12 directly into the screw fixing portion 10d. Since the structure is fixed to the screen support frame 9, there is no need for drilling holes for screwing, and the manufacturing cost can be reduced.

  Further, since the base 10a of the screen holding member 10 is inserted into the recessed groove 9a of the mounting portion 9b of the screen support frame body 9 and is inserted and fixed with the fixing screw 12, the assembly becomes easy and the temperature is increased. The undulation phenomenon in the screen holding member 10 can be effectively suppressed against the shrinkage / expansion of the screen holding member 10 caused by environmental changes such as humidity, and the screen unit 5 can be stably held from this point.

<Other embodiments>
In the first embodiment, the base portion 10a and the screen mounting portion 10b are formed of a rigid material, and the intermediate connecting portion 10c is formed of a flexible material, but the entire screen holding member 10 is shown. It is good also as a structure which formed from the material which has rigidity as a thin-walled form, and has arrange | positioned the flexible material which has predetermined thickness for reinforcement, for example, an elastomer material, on the inner surface side. Even in this case, mechanical strength can be secured and flexibility can be secured.

  The present invention is not limited to the specific configuration of each part, and various modifications can be made without departing from the spirit of the present invention.

  Furthermore, as an example of use of the present invention, the present invention relates to a screen mechanism in an apparatus that forms a transmission type screen unit using a plurality of screen constituent members in the screen configuration of a rear projection type image display device, and the adhesion performance and flatness between the screen units. It can be applied to other video display devices that require high performance.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general | schematic external appearance perspective view which combined the rear projection type video display apparatus concerning Embodiment 1 with this invention. It is an external appearance perspective view which expands and shows a rear projection type video display apparatus. It is a cross-sectional enlarged view in the S1-S1 position or S2-S2 position in FIG. It is a disassembled perspective view of the principal part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rear projection type image display apparatus, 2 Multi projector, 5 Screen unit, 6 Projection unit, 7 Lenticular sheet, 8 Fresnel lens, 9 Screen support frame, 10 Screen holding member, 10a base, 10b Screen mounting part, 10c Intermediate connection Part, 10d screw fixing part, 11 adhesive sheet, 12 fixing screw, 13 screen holding bracket.

Claims (1)

A transmissive screen unit configured by superimposing a plurality of screen constituent members, a screen support frame that supports the transmissive screen unit via a screen holding member, and a projection unit that projects an image on the transmissive screen unit. In the rear projection type video display device that projects the video projected from the projection unit from the back of the transmissive screen unit,
One end portion of the screen holding member is inserted into and supported by the concave groove of the screen support frame body , and the other end portion of the screen holding member is bonded to the periphery of the transmissive screen unit so that the transmissive screen unit is and supported by, the screen holding member have a flexible,
The screen holding member is formed of two kinds of materials, a material having rigidity and a material having flexibility,
A material having flexibility is disposed on at least the inner surface side of the screen holding member,
The one end portion of the screen holding member is provided with a screw fixing portion that is screwed in the concave groove of the screen holding frame, and the screw fixing portion is pressed without being penetrated by a screw and is recessed. is fixed in the groove, a rear projection type image display device comprising that you have been formed of a material that the screwing unit has a flexibility.

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