JP2004191464A - Screen mounting structure for projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent trouble from occurring on a screen even if the screen is expanded or contracted. <P>SOLUTION: A screen 4 is positioned somewhat ahead of the aperture of a frame 2 having the aperture in front. The screen 4 covering the aperture is obtained by combining a lenticular lens 6 and a Fresnel lens 8 both of which are screen-shaped in the front-and-rear direction of the aperture. A light shielding film 10 is fixed on all the area of the periphery part of the screen and mounted on the frame 2 so as to slide in the front-and-rear direction of the frame 2. A sheet 18 connected to all the area of the periphery part of the screen 4 is extended over the film 10 toward the frame 2 side on the outside of the film 10. Adjusting tools 22 are coupled with the specified spots of the extended edge of the sheet 18. The tools 22 have a coil spring 50 elongated and contracted nearly along the front-and-rear direction of the frame 2 in accordance with force from the sheet 18. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for mounting a screen in front of an opening of a housing in which a projector is built.
[0002]
[Prior art]
Conventionally, as the above-mentioned screen mounting structure, for example, there is one disclosed in Patent Document 1.
[0003]
[Patent Document 1]
JP-A-2000-284365 (paragraph numbers 0017 to 0043)
[0004]
In the technique of Patent Literature 1, a screen is provided so as to close an opening of a housing containing a projector and press an end face of the opening. This screen comprises a lenticular lens and a Fresnel lens. A film pulling member having a hook at the tip of a light-shielding film adhered to the peripheral portion of the lenticular lens is disposed in the housing so as to be able to advance and retreat. A tension spring is connected to the pulling member, and pulls the film to apply a moving force in such a direction that the lenses come into close contact with each other.
[0005]
According to this technique, a tension force is always applied to the film pulling member by the tension spring, and the lenticular lens and the Fresnel lens are brought into close contact. Therefore, even if the screen expands and deforms in a high-humidity atmosphere, the two lenses are kept in close contact with each other.
[0006]
[Problems to be solved by the invention]
However, in Patent Document 1, the screen is provided so as to press the opening end surface of the housing. Therefore, when the screen is about to expand, it cannot be sufficiently stretched, and the screen may be distorted. Conversely, when the screen is about to shrink, the screen cannot be sufficiently shrunk, and the screen may be damaged.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a projector screen mounting structure that does not cause any obstacle to the screen even when the screen expands and contracts.
[0008]
[Means for Solving the Problems]
An attachment structure for a projector screen according to one embodiment of the present invention includes a frame. This frame has an opening in the front. The screen is located somewhat ahead of the opening in this frame. This screen covers the opening of the frame, and has a lenticular lens and a Fresnel lens. These are each formed in a screen shape. These are combined in the front-back direction of the opening of the frame. The peripheral portions of these two lenses expand and contract due to changes in the ambient temperature. It is desirable that approximately the center of these two lenses be fixed to the frame. A light-shielding film is fixed to the entire periphery of the screen. The light-shielding film is attached to the frame so as to be slidable in the front-rear direction of the frame. Outside the light-shielding film, a sheet is bonded to the entire peripheral portion of the screen. This sheet extends beyond the light-shielding film on the frame side. Adjustment means are provided at predetermined positions on the extended end of the sheet, for example, at a plurality of different positions. The adjusting means has an elastic means, and the elastic means expands and contracts substantially along the front-rear direction of the frame according to the force applied from the seat. It should be noted that a plurality of screens attached to the frame can be combined to form a multi-screen for a projector.
[0009]
According to the mounting structure of the projector screen configured as described above, the screen is connected to the elastic means via the sheet. When the screen expands, the force exerted by the screen on the elastic member via the sheet is weakened, and the elastic means is extended to pull the screen toward the frame. Therefore, the lenticular lens and the Fresnel lens constituting the screen maintain a close contact with each other. At this time, since there is a gap between the screen and the opening of the frame, the screen is pulled to the rear side of the frame without being hindered by the frame. Therefore, no distortion occurs on the screen. At this time, the light-shielding film is also pulled to the rear side of the frame, but since the light-shielding film is attached to the frame so as to be slidable in the front-rear direction of the frame, the light-shielding film is not damaged. When the screen shrinks, the force applied by the screen to the elastic means via the sheet increases. Therefore, the elastic means is contracted, and the lenticular lens and the Fresnel lens are kept in close contact with each other in a state of being balanced with the force. At this time, the light-shielding film is also pulled to the front side of the frame, but since the light-shielding film can slide in the front-rear direction of the frame, the light-shielding film is not damaged. As described above, since the gap is provided between the screen and the opening of the frame, even if the screen expands or contracts, the lenticular lens and the Fresnel lens constituting the screen maintain a close contact state, and There is no distortion or damage to the screen.
[0010]
The adjustment means may include an engagement means coupled to the distraction end of the sheet. Locking means for locking the engaging means is provided. The locking means is provided so as to be slidable in the front-rear direction of the frame. The elastic means applies an urging force slidable along the front-rear direction of the frame to the locking means.
[0011]
Further, the locking means can be provided on a support portion provided on the frame so as to be slidable in the front-rear direction of the frame. The elastic means is provided between the support and the locking means.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The projector screen mounting structure according to one embodiment of the present invention has a frame 2 as shown in FIG. The frame 2 is formed in a substantially short rectangular parallelepiped shape having a hollow inside, and the front surface and the rear surface are each opened in a rectangular shape. A housing (not shown) is attached to the rear surface. A projector is arranged in this housing, and performs projection toward an opening on the front surface. Note that the frame 2 can be formed integrally with the housing.
[0013]
A screen 4 is arranged on the front opening side of the frame 2. As shown in FIG. 1, the screen 4 includes a screen-shaped lenticular lens 6 and a screen-shaped Fresnel lens 8, and is arranged in a state where the Fresnel lens 8 is in contact with the back side of the lenticular lens 6. ing. The screen 4 is arranged somewhat ahead of the front opening of the frame 2, has a size substantially matching the size of the front opening, and is arranged so as to substantially cover the front opening. The screen 4 is fixed to an appropriate fixing portion (not shown) in the frame by a fixing device (not shown), but a center portion thereof, not shown.
[0014]
A step is formed on the entire periphery of the Fresnel lens 8, and a light-shielding film 10 is adhered to the step. Since the step portion is formed and the light shielding film 10 is provided on the step portion, the light shielding film 10 does not protrude outward from the peripheral portion of the screen 4. Since the screen 4 is provided in front of the front opening of the frame 4, the light-shielding film 10 is for preventing light from the projector from leaking outside through a gap between the two. Elongated holes 12 are formed at the tip of the light-shielding film 10 at predetermined intervals along the entire circumferential direction of the frame. These long holes 12 are formed along the front-back direction of the frame. Screws 14 inserted into the elongated holes 12 are screwed into recesses 16 formed in the frame 2, and the light-shielding film 10 is attached to the frame 2. However, the light shielding film 10 is slidably attached to the frame 10 in the front-rear direction.
[0015]
On the outer side of the light-shielding film 10, a sheet 18 is arranged. One end of each of the sheets 18 is adhered to the periphery of the screen 4. At the other end of the sheet 18, a plurality of tongue pieces 18a are formed at predetermined intervals. These tongue pieces 18 a extend beyond the light-shielding film 10 to the rear of the frame 2, and are connected to an adjusting tool 22 provided in a groove 20 formed on the entire periphery of the frame 2.
[0016]
As shown in FIGS. 3 and 4, the adjusting tool 22 includes a fixing tool 24 for sandwiching and fixing the tongue piece 18 a in a sandwich shape from above and below. As shown in FIG. 5, the fixture 24 includes a flat lower fixing member 24a and a flat upper fixing member 24b. In a state where the tongue piece 18a is sandwiched between these, the two fixing members 24a, 24b are fixed by the pop rivets 28, 28 inserted into the holes 26a, 26b at both ends of the both fixing members 24a, 24b.
[0017]
At both ends of the rear edge of the upper fixing member 24b, engagement portions 30, 30 are integrally formed downward so as to form an acute angle with the upper fixing member 24b. These engaging portions are locked to the rear edge of the locking member 32 having a substantially flat plate shape. A notch is formed from the center of the rear edge of the locking member 32 toward the front side, and a tongue piece 32a extending downward is formed in the inner part of the notch.
[0018]
In front of the tongue piece 32a, tongue pieces 32b and 32c extending downward and located on both sides of the tongue piece 32a are integrally formed.
[0019]
The locking member 32 is attached to the support portion 34 arranged in the groove 20 described above. As shown in FIG. 5, the support portion 34 has a front portion formed in a substantially inverted U-shape, and is fixed in the groove 20 so that the front portion is located substantially perpendicular to the front-rear direction of the frame 2. A rectangular opening 36 is formed in the center of the upper wall 34a. The opening 36 is formed such that the dimension along the lateral direction of the frame 2 is equal to or larger than the width dimension of the tongue piece 32a, and the dimension along the longitudinal direction of the frame is such that the locking member 32 is moved by a predetermined distance in the longitudinal direction of the frame. It is set to be slidable. The tongue piece 32 a of the locking member 32 is inserted into the opening 36.
[0020]
On both sides of the opening 36, elongated openings 38 and 40 are formed. The tongue pieces 32b, 32c of the locking member 32 are inserted into these openings 38, 40. These tongue pieces 32b and 32c have dimensions in the front-rear direction of the frame 2 so as to be slidable in the front-rear direction of the frame 2 by a predetermined distance.
[0021]
Therefore, the locking member 32 is slidable on the upper wall 34 a of the support portion 34 in the front-rear direction of the frame 2.
[0022]
The tongue pieces 32b and 32c are attached to the support portion 34 so as to be slidable in the front-rear direction of the frame 2 by bolts 44 inserted into long holes 42 formed on both side walls of the support portion 32.
[0023]
At the center of the front side edge of the upper surface wall 34a of the support portion 34, a tongue piece portion 46 extending downward integrally therewith is formed. A bolt 48 is inserted from the tongue piece portion 46 toward the inside of the support portion 34. The tip of the bolt 48 does not reach the tongue piece 32 a of the locking member 32. An elastic means, for example, a partially compressed coil spring 50 is inserted through the bolt 48. The coil spring 50 is in contact with the tongue piece 46 and the tongue piece 32a, respectively.
[0024]
The tongue piece 18a of the seat 18 is fixed to the fixing portion 24, the engaging portion 30 of the fixing portion 24 engages with the locking portion 32, and the locking portion 32 slides on the support portion 34 in the front-rear direction of the frame 2. The peripheral portion of the screen 4 is pulled to the rear of the frame 4 by each of the coil springs 50 since the locking portion 32 is provided so as to be able to receive the pressing force by the coil springs 50. However, at a certain reference temperature, the coil spring 50 generates a traction force that balances the force generated by the screen 4 so that the periphery of the screen 4 is substantially vertical. In addition, the coil spring 50 causes the screen 4 to expand due to the ambient temperature rising above the reference temperature, or to contract due to the ambient temperature falling below the reference temperature, causing the screen 4 to move with respect to the coil spring 50. When the applied force is reduced or increased, the coil spring 50 is formed so as to be able to expand and contract so as to balance with the changed force.
[0025]
In the screen mounting structure configured as described above, as described above, the screen 4 is positioned almost vertically at a certain reference temperature. In this state, when the projection is performed by the projector, since the light shielding film 10 is provided in the gap between the screen 4 and the opening of the frame 2, the projection light does not leak to the periphery of the screen.
[0026]
When the ambient temperature rises, the entire periphery of the screen 4 expands because the center of the screen 4 is fixed. As a result, the force applied by the screen 4 to the coil spring 50 decreases, and the coil spring 50 extends. Accordingly, the locking member 32 moves to the rear of the frame 2. The engaging portion 30 engaged with the locking member 32 also moves rearward, and the tongue piece 18a of the seat 18 also moves rearward. As a result, the periphery of the screen 4 is also pulled rearward, and the close contact between the lenticular lens 6 and the Fresnel lens 8 is maintained. At this time, the light-shielding film 10 moves rearward along the long hole 12, so that the light-shielding film 10 is not distorted. At this time, since there is a gap between the screen 4 and the opening of the frame 2, the screen 4 can be bent backward. If the frame 2 and the screen 4 are formed so as to be in contact with each other from the beginning, the screen 4 cannot bend backward, and the close contact between the Fresnel lens 8 and the lenticular lens 6 of the screen 4 is not maintained.
[0027]
When the ambient temperature falls below the reference temperature, the central portion of the screen 4 is fixed, so that the entire peripheral edge of the screen 4 contracts. As a result, the force applied by the screen 4 to the coil spring 50 increases, and the coil spring 50 contracts. Accordingly, the engaging portion 32 moves forward of the frame 2, the engaging portion 30 engaged with the engaging member 32 also moves forward, and the tongue piece 18a of the seat 18 also moves forward. As a result, the periphery of the screen 4 also bends forward, and the close contact between the lenticular lens 6 and the Fresnel lens 8 is maintained. At this time, the light-shielding film 10 moves forward along the long holes 12, so that the light-shielding film 10 is not distorted.
[0028]
Thus, even if there is a temperature change, the close contact between the lenticular lens 6 and the Fresnel lens 8 constituting the screen 4 can be maintained. In addition, since the locking member 32 is attached to the support portion 34, the distance of the screen 4 moving back and forth is regulated within a predetermined range by the dimensions of the openings 36, 38, and 40 of the support portion 34.
[0029]
In the above embodiment, the adjusting tool 22 is configured by the fixing portion 24, the engaging portion 30, the locking member 32, the support portion 34, and the like. For example, one end of the coil spring is fixed to the fixing portion 24, and the other end is fixed. It can be fixed to the frame 2. A multi-screen can be configured by combining a plurality of screens configured as described above.
[0030]
【The invention's effect】
As described above, according to the present invention, even if expansion and contraction due to a temperature change occur in the screen, the close contact between the lenticular lens and the Fresnel lens that constitute the screen can be maintained, and the temperature rises. In such a case, the screen and the frame are not damaged.
[Brief description of the drawings]
FIG. 1 is a partially omitted vertical sectional side view of a screen mounting structure for a projector according to an embodiment of the present invention.
FIG. 2 is a perspective view of the screen mounting structure of FIG.
FIG. 3 is a vertical sectional side view of an adjusting tool used in the screen mounting structure of FIG. 1;
FIG. 4 is a side view of the adjustment tool of FIG. 3;
FIG. 5 is an assembly view of the adjustment tool of FIG. 3;
[Explanation of symbols]
2 Frame 4 Screen 6 Lenticular lens 8 Fresnel lens 10 Light shielding film 18 Sheet 22 Adjuster

Claims (3)

A frame having an opening in front,
A screen that is located somewhat forward of the opening of the frame, covers the opening, combines a screen-shaped lenticular lens and a Fresnel lens in the front-rear direction of the opening, and the peripheral portion expands and contracts due to a change in ambient temperature. When,
A light-shielding film fixed to the entire peripheral portion of the screen and attached to the frame so as to be slidable in the front-rear direction of the frame,
Outside the light-shielding film, a sheet that is coupled to the entire peripheral portion of the screen and extends beyond the light-shielding film on the frame side,
An adjusting means having elastic means connected to a predetermined portion of an extension end of the seat and elastically extending and contracting substantially along a front-rear direction of the frame in accordance with a force applied from the seat;
Screen mounting structure for projector to be provided. 2. The screen mounting structure for a projector according to claim 1, wherein the adjusting means includes an engaging means coupled to an extended end of the tow sheet.
Locking means for locking the engagement means, and slidably provided along the front and rear direction of the frame, wherein the elastic means moves the locking means along the front and rear direction of the frame. A screen mounting structure for projectors that provides a slidable biasing force. 3. The screen mounting structure for a projector according to claim 2, wherein the locking means is slidably provided on a support portion provided on the frame along a front-rear direction of the frame, and the elastic means is provided on the support section. A screen mounting structure for a projector provided between a portion and the locking means.

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