JP2012159853A - Screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable type screen capable of easily correcting luminance unevenness.SOLUTION: A movable type screen 1 includes a planar screen body 3 having flexibility, a screen support 2 provided to face the rear surface of the screen body 3 at a predetermined interval from the screen body 3, a plurality of interval adjustment cylinders 5 provided at a predetermined pitch in the surface direction of the screen body 3, bridged between the rear surface of the screen body 3 and the screen support 2, and provided to be freely expandable and contractable in a direction from the screen body 3 to the screen support 2, a luminance sensor provided at the top end on the side of the screen body 3 of each interval adjustment cylinder 5 and detecting the luminance value of image light projected onto the image projection surface 31 of the screen body 3, to output a detection signal, and a control circuit part controlling the expansion and contraction of the interval adjustment cylinders 5, according to the detection signal from the luminance sensor.

Description

  The present invention relates to a movable screen that displays an image by projecting image light.

  Conventionally, some projectors have a correction mechanism for correcting luminance unevenness of an image displayed on a screen (see, for example, Patent Documents 1 and 2).

  The projector described in Patent Document 1 converts R, G, and B signals into digital signals and outputs them to the storage unit. Further, the timing signal generator outputs a signal indicating the coordinate position of each pixel by counting the input timing of the horizontal synchronization signal and the vertical synchronization signal of the video signal. Further, using a memory in which an address indicating the pixel position is written in a circular shape indicating a preset pixel adjustment range, an address indicating the pixel position corresponding to the signal indicating the coordinate position is output to the storage unit. A configuration is adopted in which the luminance of each R, G, B of the address within the adjustment range is corrected based on the correction characteristics written in advance in the lookup table to prevent the occurrence of luminance unevenness.

  Further, the projector described in Patent Document 2 is provided with a gyro sensor that reads angle information in the projector or on the screen. The projector automatically corrects the trapezoidal distortion based on the angle information read from these gyro sensors.

JP-A-8-146922 JP 2001-339671 A

  However, the projector of Patent Document 1 requires a mechanism for detecting the pixel address in the adjustment range, and in consideration of changes over time, it is necessary to provide sensors for detection inside. There is a problem that the configuration of the projector is complicated. In addition, although it is possible to perform image correction inside the projector, since the positional relationship between the projector and the screen is not taken into consideration, even if luminance unevenness occurs at the stage of projection onto the screen, it cannot be corrected. There is.

  Further, the projector of Patent Document 2 detects the angle of the projector and the screen with a gyro sensor and corrects the trapezoidal distortion based on the positional relationship, but has a problem that it cannot correct even the luminance unevenness. Further, similarly to Patent Document 1, the correction is performed by the projector, and the correction circuit and the like are complicated, so that there is a problem that the configuration of the projector is complicated.

  A so-called curved screen, which determines the curvature of the screen based on the positional relationship with the projector, is also conceivable. However, it is difficult to change the curvature in real time during image projection, and luminance unevenness is sufficiently corrected. There is a problem that can not be.

  In view of the above problems, an object of the present invention is to provide a movable screen that can easily correct luminance unevenness.

  The movable screen of the present invention has a flexible planar screen body and a back surface on the opposite side of the image projection surface onto which image light is projected of the screen body. And a screen support provided at a predetermined pitch along the surface direction of the screen main body, and is bridged between the back surface of the screen main body and the screen support so that the screen support is supported from the screen main body. A plurality of interval adjusting means provided to be extendable in a direction toward the body, and brightness of image light projected on the image projection surface of the screen body, provided at the tip of the interval adjusting means on the screen body side And a sensor that outputs a detection signal, and controls expansion and contraction of the interval adjusting means according to the detection signal from the sensor. And control means that, characterized by comprising a.

  According to this invention, the movable screen is connected to the flexible screen main body and the screen support by the interval adjusting means provided with a plurality of predetermined pitches. Then, when image light is detected by a sensor provided at the tip of these interval adjusting means and a detection signal is output, the control means expands and contracts the interval adjusting means according to the detection signal. Here, the sensor detects the brightness of the image light, and the control means expands and contracts the interval adjusting means so that the brightness becomes constant according to the detection signal corresponding to the brightness. As a result, the brightness adjustment is made uniform and the brightness unevenness is eliminated by expanding and contracting the distance adjusting means so as to make the brightness detected by the sensor uniform, and deforming it to the curved surface of the image projection surface of the screen body. Can do.

In the movable screen of the present invention, the sensor detects a luminance value of the image light and outputs a detection signal corresponding to the luminance value, and the control means determines the luminance value based on the detection signal. It is preferable to shorten the interval adjusting means corresponding to the large portion and extend the interval adjusting means corresponding to the portion having the small luminance value.
According to this invention, the brightness value of the image light projected by the sensor is detected, and the control means shortens the distance control means for the sensor position having a large brightness value and extends the distance control means for the sensor position having a low brightness value. Let As a result, the luminance value can be reduced at the sensor position where the luminance value is large, and the luminance value can be increased at the sensor position where the luminance value is small. Uniformity can be achieved, and uneven brightness can be prevented.

Furthermore, the movable screen of the present invention is provided with a predetermined interval from the outer peripheral edge of the screen main body in the surface direction of the screen main body, and includes a frame member that surrounds the screen main body. It is preferable that the outer peripheral edge of the screen body is connected by an elastic member.
According to this invention, the outer peripheral edge of the screen body is connected to and held by the frame member via the elastic member. As a result, even when a part or all of the screen main body is advanced or retracted with respect to the screen support by the spacing adjustment member, the inconvenience that the outer peripheral edge of the screen main body bends in an unintended direction, the screen main body misalignment or dropout, etc. Inconvenience can be prevented.
Further, since the outer peripheral edge of the screen main body is connected to the frame member via the elastic member, the outer peripheral edge of the screen main body can ensure a predetermined amount of movement. Therefore, for example, even when the expansion / contraction state of the interval adjusting member provided at the position closest to the outer peripheral edge of the screen main body is adjusted, the surface shape of the image projection surface extending from the portion displaced by the interval adjusting member to the outer peripheral edge of the screen main body is changed. Smoothness can be achieved, and uneven brightness in the projected image can be adjusted appropriately.

Furthermore, in the movable screen of the present invention, the interval adjusting means is connected to either the screen main body or the screen support, a connection shaft portion extending toward the screen main body or the screen support, and the screen main body or the screen support. In addition, it is preferable to include a receiving part that has a substantially concave shape, and that holds the connecting shaft part so that the tip part of the connecting shaft part can move at the receiving part.
According to the present invention, the connecting shaft portions provided at both ends of the interval adjusting means are held movably at the tip portions of the connecting shaft portions by the tray portions of the receiving portions connected to the screen body and the screen support. . As a result, the connecting shaft portion can move within the area of the tray portion, and the angle between the screen support and the connecting shaft portion and the angle between the screen body and the connecting shaft portion can be arbitrarily changed. That is, when the distance adjusting means is arranged perpendicular to the surface direction of the screen support and the screen body in the initial state (the state in which the distance adjusting means is not expanded or contracted), when the distance adjusting means expands and contracts, Since only the portion to which the interval adjusting means is connected advances and retreats in the front-rear direction (the direction from the screen support to the screen body), the surface shape of the image projection surface of the screen body changes abruptly. There is a possibility that an image with good image quality cannot be displayed, for example, a shadow is formed in part. On the other hand, as described above, by connecting the connecting shaft portion to the receiving portion so that the distal end portion of the connecting shaft portion can move in the saucer portion, the interval adjustment is adjusted when the indirect adjusting means expands and contracts. The angle between the means and the screen body and the screen support is arbitrarily changed. Thereby, the undulation change of the surface shape of the image projection surface of the screen body does not become abrupt, and a smooth curved surface can be formed. Therefore, luminance unevenness can be prevented well, and an image with good image quality can be displayed on the image projection surface of the screen body.

And in the movable screen of this invention, it is preferable that the said space | interval adjustment means is provided with the surface member which has a contact surface fixed facing the back surface of the said screen main body at the said screen main body side edge part.
According to this invention, in the indirect adjustment means, the contact surface of the surface member is fixed to the screen body. Thereby, when the indirect adjusting means expands and contracts, the screen main body can be pressed or pulled by the entire contact surface. Therefore, for example, when the screen main body is pressed or pulled at one point where the sensor is provided, only one point moves in the front-rear direction, so there is a possibility that the undulation change in the surface shape of the image projection surface may be abrupt. Since the entire region where the contact surface contacts is moved in the front-rear direction, the undulation change of the surface shape of the image projection surface of the screen body can be smoothed.

It is a perspective view which shows the outline of the movable screen which concerns on one embodiment of this invention. In the movable screen of the embodiment, each interval control cylinder is a cross-sectional side view in an initial state where the expansion / contraction operation is not performed. It is the perspective view which expanded a part of front side connection axial part of the space | interval control cylinder in the movable screen of the said embodiment. It is the sectional side view to which the front-end | tip part of the front side connection shaft part of the space | interval control cylinder in the movable screen of the said embodiment was expanded. It is the sectional side view to which the front-end | tip part of the back side connection shaft part of the space | interval control cylinder in the movable screen of the said embodiment was expanded. In the movable screen of the embodiment, it is a side sectional view in a state in which a distance control cylinder is expanded and contracted. It is a block diagram which shows schematic structure of the movable screen of the said embodiment. It is a flowchart which shows operation | movement of the movable screen of the said embodiment.

Hereinafter, a movable screen according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an outline of a movable screen according to an embodiment of the present invention.
FIG. 2 is a sectional side view of the movable screen according to the embodiment in an initial state in which each interval control cylinder does not perform an expansion / contraction operation.
FIG. 3 is an enlarged perspective view of a part of the front side connecting shaft portion of the distance control cylinder in the movable screen of the embodiment.
FIG. 4 is an enlarged side cross-sectional view of the front end portion of the front-side connecting shaft portion of the distance control cylinder in the movable screen of the embodiment.
FIG. 5 is an enlarged side cross-sectional view of the front end portion of the back side connecting shaft portion of the distance control cylinder in the movable screen of the embodiment.
FIG. 6 is a sectional side view of the movable screen according to the embodiment in a state in which the distance control cylinder is expanded and contracted.
FIG. 7 is a block diagram showing a schematic configuration of the movable screen of the embodiment.

  In FIG. 1, reference numeral 1 denotes a movable screen. The movable screen 1 is a device on which image light projected from an image projection device such as a projector 10 (see FIG. 7) is projected and displayed. As shown in FIG. 1, the movable screen 1 includes a screen support 2, a screen body 3, a frame member 4, and a gap adjusting cylinder 5 as a plurality of gap control means.

The screen support 2 is a member that is fixed to, for example, a fixed wall on which the movable screen 1 is installed. The screen support 2 is formed in a plate shape, the rear surface is fixed to a fixed wall, and the front surface is arranged to face the screen body 3. A plurality of distance adjusting cylinders 5 that are bridged with the screen body are connected to the front surface of the screen support 2 at a predetermined pitch.
In addition, although the structure which provides the screen support body 2 in a fixed wall is shown, the wall (fixed wall) of a building itself may comprise the screen support body 2, for example, In this case, a space | interval control cylinder is directly attached to a wall. What is necessary is just to set it as the structure connected.

  Although not shown, the frame member 4 is fixed to the fixed wall or the screen support 2 directly or using a predetermined fixing member. The frame member 4 is formed in a substantially rectangular shape, has an inner peripheral edge that is larger than the outer peripheral edge of the screen main body 3, and the screen main body 3 is disposed on the inner peripheral portion of the frame. Further, the inner peripheral edge of the frame member 4 and the outer peripheral edge of the screen body 3 are connected by a plurality of springs 41 as shown in FIG.

  The screen body 3 is formed by a planar member having flexibility, and as described above, the outer peripheral edge is connected to the inner peripheral edge of the frame member 4 via the spring 41, and the back side is formed by a plurality of interval control cylinders. Connected to the screen support 2.

The interval adjusting cylinders 5 for connecting the screen support 2 and the screen main body 3 are arranged at a predetermined pitch along the surface direction of the screen main body and the screen support. As the number of the distance adjusting cylinders 5, for example, a total of 200 is arranged at a ratio of 10 in the vertical direction and 20 in the horizontal direction. The number of spacing adjustment cylinders 5 is not limited to 200. For example, when the screen main body 3 is sufficiently large, a configuration may be provided for each pixel of the projected image.
As shown in FIG. 2, these gap adjusting cylinders 5 include a cylinder body 51, a front side connecting shaft portion 52, a front side receiving portion 53 that connects the front side connecting shaft portion 52 to the screen body 3, and a rear side. A connecting shaft portion 54 and a back side receiving portion 55 that connects the back side connecting shaft portion 54 to the screen support 2 are provided.

  The front-side connecting shaft portion 52 extends from the cylinder body 51 toward the screen body 3 and is supported so as to be movable forward and backward in the axial direction with respect to the cylinder body 51. As shown in FIG. 4, for example, a substantially spherical connection end 521 is provided at the end of the front-side connection shaft portion 52 on the screen body 3 side, and is held by the front-side receiving portion 53.

As shown in FIG. 3, the front side receiving portion 53 includes a contact surface 531 with which the front side contacts the back side of the screen main body 3, and the image projection surface 31 of the screen main body 3 is provided at a substantially central portion of the contact surface 531. A luminance sensor 56 is provided for detecting the luminance value of the image light projected on the screen. The front surface receiving portion 53 is fixed by, for example, affixing the contact surface 531 to the rear surface side of the screen body 3.
The luminance sensor 56 is disposed so as to face the image projection surface 31 side of the screen main body 3 from a hole (see FIG. 4) provided in the screen main body 3, and the luminance of the image light projected from the image projection device such as the projector 10. Detect value. Then, the luminance sensor 56 outputs a detection signal corresponding to the detected luminance value to a signal receiving unit 511 (see FIG. 7), which will be described later, housed in the cylinder body 51.

  A holding portion 532 is provided on the back side of the front side receiving portion 53 (see FIG. 4). The holding portion 532 is formed in a spherical concave shape having a diameter that is slightly larger than the diameter of the connection end 521 of the front side connection shaft portion 52, and can be inserted through the connection end 521 of the front side connection shaft portion 52. A connection hole is provided. The connection hole is formed with a diameter smaller than the diameter of the connection end 521 of the front side connection shaft portion 52 and larger than the diameter of the front side connection shaft portion 52. And the holding | maintenance part 532 rotates the front side connection shaft part 52 to the arbitrary angles which cross | intersect with respect to the surface direction of a screen main body by inserting and inserting the connection end 521 of the front side connection shaft part 52 from a connection hole. Hold it possible. Thereby, as shown in FIG. 6, for example, even when the distance adjusting cylinder 5 is extended, the posture can be changed so that the distance adjusting cylinder 5 intersects the screen body 3 at an arbitrary angle.

  The back side connecting shaft portion 54 extends from the cylinder body 51 to the screen support 2 side, and is supported by the cylinder body 51 so as to be movable back and forth in this axial direction. The screen support 2 side end of the back side connection shaft portion 54 is provided with a connection end 541 having, for example, a substantially spherical shape, and is held by the back side receiving portion 55, similarly to the front side connection shaft portion 52.

  As shown in FIGS. 2 and 5, the back side receiving part 55 is fixed on the screen support 2, and a concave receiving part 551 is formed on the surface facing the screen body 3. The back side receiving portion 55 is configured such that the connection end 541 of the back side connecting shaft portion 54 is movable along the concave surface in the tray portion 551, and the back side connecting shaft portion 54 is in the surface direction of the screen support 2. The back side connecting shaft portion 54 is held so as to be rotatable at an arbitrary angle that intersects with the back side connecting shaft portion 54. Thereby, as shown in FIG. 6, for example, even when the distance adjusting cylinder 5 is extended, the posture can be changed so that the distance adjusting cylinder 5 intersects the screen support 2 at an arbitrary angle.

  Further, the back side connecting shaft portion 54 and the screen support 2 are connected by a wire 57. The wire 57 is pulled most in a state where the connection end 541 of the back side connection shaft portion 54 is positioned at the lowermost end of the tray portion 551, and prevents the back side connection shaft portion 54 from falling off.

  As shown in FIG. 7, the cylinder main body 51 includes a signal receiving unit 511, a memory 512, a control circuit unit 513 as a control unit, and a first drive mechanism 514 that drives the front-side connection shaft unit 52 to advance and retreat. And a second drive mechanism 515 for advancing and retracting the back side connecting shaft portion 54.

  The signal receiving unit 511 is connected to the luminance sensor 56 and the control circuit unit 513, receives the detection signal input from the luminance sensor 56, converts the detection signal into a digital signal, and outputs the digital signal to the control circuit unit 513.

The memory 512 is connected to the control circuit unit 513. In this memory 512, a brightness-corresponding drive data table that is information regarding the amount of expansion / contraction operation of the interval adjusting cylinder 5 with respect to the brightness value detected by the brightness sensor 56 is recorded.
Specifically, the luminance-corresponding drive data table includes the luminance-corresponding drive data in which the luminance value data, the front-axis drive value data, and the rear-axis drive value data are associated as one record. The data is constructed in a table structure for recording a plurality of records.
Here, the luminance value data is data relating to the luminance value of the image light projected on a part of the screen body 3 to which each interval adjusting cylinder 5 is connected. The front axis drive value data records the amount of forward / backward drive of the front connection shaft 52 when the luminance sensor 56 detects the luminance indicated by the luminance value data. In the rear-axis drive value data, the advancing / retreating drive amount of the back-side connection shaft portion 54 when the luminance sensor 56 detects the luminance indicated by the luminance value data is recorded. Further, the front axis drive value data and the rear axis drive value data move the front side connecting shaft part 52 and the rear side connecting axis part 54 to the inside of the cylinder body 51 when the value of the luminance value data is large. When the brightness value data is small, the drive amount for moving the front side connecting shaft portion 52 and the back side connecting shaft portion 54 to the outside of the cylinder body 51 is recorded.

  The first drive mechanism 514 includes a motor (not shown) and a drive transmission mechanism (not shown) that transmits the driving force of the motor to the front connection shaft 52. The first drive mechanism 514 drives the motor based on the drive signal input from the control circuit unit 513, and transmits the driving force of the motor to the front-side connecting shaft portion 52 via the drive transmission mechanism. The front side connecting shaft portion 52 is moved forward and backward along the axial direction.

  Similar to the first drive mechanism 514, the second drive mechanism 515 includes a motor (not shown) and a drive transmission mechanism (not shown) that transmits the driving force of the motor to the back-side connection shaft portion 54. Then, the second drive mechanism 515 drives the motor based on the drive signal input from the control circuit unit 513, and moves the back side connecting shaft portion 54 forward and backward along the axial direction.

Based on the detection signal from the luminance sensor 56 received by the signal receiving unit 511 and the luminance corresponding driving data table recorded in the memory 512, the control circuit unit 513 sends the first driving mechanism 514 and the second driving mechanism 515. A predetermined drive signal is output.
Specifically, the control circuit unit 513 recognizes the luminance value recorded in the detection signal from the detection signal received by the signal reception unit 511. In addition, the control circuit unit 513 recognizes luminance-corresponding driving data in which luminance value data corresponding to the recognized luminance value is recorded from the luminance-corresponding driving data table. Then, the control circuit unit 513 corresponds to the front / rear driving shaft 52 and the rear connecting shaft corresponding to the forward / backward driving amount recorded in the front axis driving value data and the rear axis driving value data of the recognized luminance corresponding driving data. A drive amount for driving the unit 54 is set and output to the first drive mechanism 514 and the second drive mechanism 515 as a drive signal.

[Operation of movable screen]
Next, the operation of the movable screen 1 will be described. FIG. 8 is a flowchart showing the operation of the movable screen of the present embodiment.

  In FIG. 7, in order to drive the movable screen 1, first, image light of an image having the same luminance in all pixels, such as an all-white image, is output from the projector 10 as an image projection device. Projection is performed on the projection surface 31 (step S101).

  When the image light is projected onto the image projection surface 31 in step S101, the luminance sensor 56 at the tip of each interval adjusting cylinder 5 provided facing the image projection surface 31 of the screen body 3 projects the projected image light. And a detection signal is output to the signal receiving unit 511 in the cylinder body 51 of each interval adjusting cylinder 5 (step S102).

Thereafter, the control circuit unit 513 of each interval adjusting cylinder 5 recognizes the luminance value of the image light projected on the luminance sensor 56 based on the detection signal received by the signal receiving unit 511. In addition, the control circuit unit 513 recognizes the luminance-corresponding driving data corresponding to the detected luminance value from the luminance-corresponding driving data table recorded in the memory 512, and the front axis driving value recorded in the luminance-corresponding driving data. Data and rear shaft drive value data are read (step S103). Then, the control circuit unit 513 sets the forward / backward drive amount of the front-side connection shaft portion 52 and the forward / backward drive amount of the rear-side connection shaft portion 54 based on the read front-axis drive value data and rear-axis drive value data ( In step S104, a drive signal corresponding to the set forward / backward drive amount is output to the first drive mechanism 514 and the second drive mechanism 515.
Further, as described above, the front-axis drive value data and the rear-axis drive value data are arranged so that the front-side connection shaft portion 52 and the rear-side connection shaft portion 54 are located inside the cylinder body 51 when the luminance value data is large. When the driving amount for moving is small, the driving amount for moving the front side connecting shaft portion 52 and the rear side connecting shaft portion 54 to the outside of the cylinder body 51 is recorded. Thereby, the control circuit unit 513 reduces the interval adjustment cylinder 5 when the luminance value detected by the luminance sensor 56 is large, and moves the interval adjustment cylinder 5 when the luminance value detected by the luminance sensor 56 is small. A drive signal is output to the first drive mechanism 514 and the second drive mechanism 515 so as to be extended.

  The first drive mechanism 514 and the second drive mechanism 515 drive the motor based on the drive signal input from the control circuit unit 513, and the front side connection shaft portion 52 and the rear side connection shaft portion 54 are driven to advance and retract. (Step S105).

Thereafter, the control circuit unit 513 recognizes the detection signal input from the luminance sensor 56 again, and determines whether or not to continue the screen adjustment (step S106). That is, in this step S106, the control circuit unit 513 recognizes the luminance value detected by the luminance sensor 56, and determines whether or not the interval adjusting cylinder 5 has normally expanded and contracted in accordance with this luminance value.
Here, when the brightness value based on the detection signal and the forward / backward drive amount of the front-side connection shaft portion 52 and the rear-side connection shaft portion 54 based on the corresponding brightness-corresponding drive data are different, Determination is made and the process of step S103 is performed again. On the other hand, the control circuit unit 513 is normal when the luminance value based on the detection signal matches the forward / backward drive amount of the front side connection shaft portion 52 and the rear side connection shaft portion 54 based on the corresponding luminance correspondence drive data. It is determined that the expansion / contraction operation has been performed, and the series of processes is terminated.

[Function and effect of movable screen]
As described above, the movable screen 1 of the above embodiment is provided between the screen body 3 formed of a flexible surface member and the screen support 2 provided to face the back side of the screen body 3. A plurality of interval adjusting cylinders 5 are connected at a predetermined pitch along the surface direction of the screen body 3. A brightness sensor 56 is provided at the tip of the spacing adjustment cylinder 5 on the screen main body 3 side so as to face the image projection surface 31, and a control circuit section 513 inside the spacing adjustment cylinder 5 is provided with the brightness sensor 56. The first and second drive mechanisms 514 and 515 are driven on the basis of the luminance value detected at, and the expansion / contraction operation of the interval adjusting cylinder 5 is controlled.
For this reason, the distance between the screen body 3 and the screen support 2 at the installation position of each distance adjustment cylinder 5 can be changed according to the luminance value of the image light projected onto the image projection surface 31. Accordingly, luminance variation can be reduced, luminance unevenness can be reduced, and an image with good image quality can be displayed on the image projection surface 31. In addition, it is not necessary to provide a complex luminance unevenness correction circuit in the image projection apparatus such as the projector 10, which can contribute to simplification of the configuration of the projector 10, and even in the projector 10 that is not provided with a correction circuit or the like, it is movable. Brightness unevenness can be corrected on the screen 1 side. That is, the luminance unevenness of the projected image light can be corrected regardless of the type of the projector 10.

The control circuit unit 513 also has a front-side connection shaft portion 52 and a rear-side connection shaft portion 54 based on the luminance value detected by the luminance sensor 56 and the luminance-corresponding drive data table recorded in the memory 512. Control to drive. At this time, the control circuit unit 513 expands the interval adjusting cylinder 5 when the luminance value detected by the luminance sensor 56 is small, and reduces the interval adjusting cylinder 5 when the detected luminance value is large.
For this reason, a portion with a large luminance value on the image projection surface 31 is moved to the screen support 2 side away from the projector 10, and a portion with a small luminance value on the image projection surface 31 is moved in a direction to be close to the projector 10 side. Luminance unevenness can be easily corrected on the projection surface 31. Therefore, the luminance unevenness can be easily corrected without providing a complicated configuration such as providing the projector 10 with a correction circuit for correcting the image signal.

Further, the inner peripheral edge of the frame member 4 and the outer peripheral edge of the screen body 3 are connected by a spring 41.
For this reason, even if the surface shape of the screen body 3 is deformed by the expansion and contraction of the distance adjusting cylinder 5, the outer peripheral edge of the screen main body 3 is held by the frame member 4, so that the outer peripheral edge of the screen main body 3 is, for example, on the front side. Inconveniences such as bending and displacement of the screen body 3 can be avoided. Further, since the outer peripheral edge of the screen body 3 is held by the spring, for example, even when the distance adjusting cylinder 5 arranged along the outer peripheral edge of the screen body 3 expands and contracts, The outer peripheral edge can also be moved in the front-rear direction. Therefore, as compared with the case where the outer peripheral edge of the screen body 3 is fixed to the inner peripheral edge of the frame member 4, the outer peripheral edge of the screen body 3 is bent by a predetermined amount in the front-rear direction (direction orthogonal to the image projection surface 31). be able to. Therefore, the image projection surface 31 of the screen body 3 can be deformed into a curved surface having a smooth curvature, and luminance unevenness can be corrected appropriately.

A front-side receiving portion 53 fixed to the screen main body 3 and a holding portion 532 on the back side of the front-side receiving portion 53 are rotatable at the front end portion of the front-side connecting shaft portion 52 on the screen main body 3 side. And a connection end 521 held by the connector. Further, at the front end of the back side connecting shaft portion 54 on the screen support 2 side, there are a back side receiving portion 55 fixed to the screen support 2 and a tray portion 551 provided on the front side of the back side receiving portion 55. A connection end 541 that is movable and rotatable with respect to the surface direction of the screen main body 3 is provided.
For this reason, the interval adjusting cylinder 5 can be inclined at an arbitrary angle between the screen body 3 and the screen support 2. That is, when the interval adjustment cylinder 5 is fixed in a state orthogonal to the screen body 3 and the screen support 2, only the position where the interval adjustment cylinder 5 is connected to the interval adjustment cylinder 5 due to expansion and contraction of the interval adjustment cylinder 5 There are cases where the smooth image projection surface 31 cannot be formed due to movement in the front-rear direction perpendicular to the surface direction and a large change in the surface shape of the image projection surface 31. In this case, there is a possibility that an image with good image quality cannot be displayed, for example, a shadow is partially formed. On the other hand, since each space | interval adjustment cylinder 5 can change an attitude | position to arbitrary angles with respect to the screen main body 3 and the screen support body 2 with the said structure, when the space | interval adjustment cylinder 5 expands, for example, The tip of the screen body 3 side can be inclined so as to move to the outer peripheral edge side of the screen body 3. Therefore, the inclination of the surface shape of the image projection surface 31 of the screen body 3 becomes gentle, and a smooth surface shape can be obtained. Therefore, it is possible to avoid the inconvenience that a shadow due to unevenness is generated in a part of the projection image, and it is possible to display an image with good image quality.

Further, the front side receiving portion 53 of the front side connecting shaft portion 52 includes a contact surface 531 on the front side, and the contact surface 531 is attached to the back side of the screen body 3.
For this reason, due to the expansion and contraction of the front surface side connecting shaft portion 52, the surface portion with which the contact surface 531 of the screen main body 3 abuts moves forward and backward in a direction orthogonal to the surface direction. Therefore, for example, as compared with a configuration in which only the luminance sensor 56 is connected to the screen main body 3 and the screen main body 3 is moved at a single point, the entire surface portion in contact with the contact surface 531 moves. Thus, the image projection surface 31 can be deformed with a gentle curved surface. Therefore, it is possible to prevent uneven brightness and to prevent the occurrence of shadows due to the undulation of the surface shape of the image projection surface, and display a high-quality image.

  Further, a wire 57 is provided between the distance adjusting cylinder 5 and the screen support 2. For this reason, even if the connection end 541 of the back surface side connecting shaft portion 54 of the space adjusting cylinder 5 is merely held in contact with the tray portion 551 of the back surface receiving portion 55, the space adjusting cylinder 5 The drop-off can be prevented, and the distance adjusting cylinder 5 can be moved in a direction substantially parallel to the surface direction of the screen body 3. Therefore, the angle of the distance adjusting cylinder 5 and the holding position with respect to the screen support 2 can be freely adjusted, and the surface shape of the image projection surface 31 of the screen body 3 can be made smoother.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, each of the first drive mechanism and the second drive mechanism includes a motor (not shown), and drives these motors based on a drive signal input from the control circuit unit 513 to drive the drive transmission mechanism. The configuration in which the front side connecting shaft portion 52 and the back side connecting shaft portion 54 are moved forward and backward is illustrated, but is not limited thereto.
That is, for example, a single drive motor may be used to drive both the front-side connection shaft portion 52 and the back-side connection shaft portion 54, and either the front-side connection shaft portion 52 or the back-side connection shaft portion 54 may be used. It is good also as a structure which drives.
Further, although the motor is exemplified as the driving source, for example, the front side connecting shaft portion 52 and the back side connecting shaft portion 54 may be driven by hydraulic pressure.

  Moreover, although the brightness | luminance corresponding | compatible drive data showed the example comprised by associating brightness value data, front-axis drive value data, and rear-axis drive value data, for example, brightness value data and brightness value data are shown. The total drive value data in which the total drive amount of the front-side connection shaft portion 52 and the back-side connection shaft portion 54 corresponding to the brightness value is recorded may be associated. In this case, it is good also as a structure which drives the front side connection shaft part 52 and the back side connection shaft part 54 by one drive motor as mentioned above. That is, based on the total drive value data, the drive motor moves the front side connecting shaft portion 52 and the rear side connecting shaft portion 54 by the same amount at the same time to expand and contract the distance adjusting cylinder 5.

Furthermore, although the example which records a brightness | luminance corresponding | compatible drive data table in the memory 512 in the cylinder main body 51 of each space | interval adjustment cylinder 5 was shown, it does not restrict to this.
For example, the movable screen 1 may include a control device including a memory in which a brightness-corresponding drive data table is recorded, and each interval adjustment cylinder 5 may be connected to the control device. In this case, when the control circuit unit 513 of each interval adjusting cylinder 5 recognizes the detection signal from the brightness sensor 56, it reads the brightness corresponding drive data from the memory of the control device. In this configuration, it is not necessary to provide a plurality of memories 512, and the configuration of each interval adjusting cylinder 5 can be simplified.
In addition, a detection signal is output from the luminance sensor 56 of each interval adjustment cylinder 5 to the control device, and the control device calculates a driving amount of each interval adjustment cylinder based on the detection signal and the luminance corresponding drive data table. A configuration in which a driving signal is output to the interval adjusting cylinder 5 may be employed.

  Furthermore, although the drive amount of the interval adjustment cylinder 5 is determined based on the brightness-corresponding drive data, for example, the control circuit unit 513 calculates the average value of the brightness values detected by the brightness sensors 56, It is good also as a structure etc. which adjust the space | interval adjustment cylinder 5 so that the luminance value detected by the sensor 56 becomes this average value. In this case, it is not necessary to record the brightness correspondence drive data table in the memory 512, and the configuration can be simplified.

  And in the said embodiment, although the saucer part 551 was provided in the back side receiving part 55, it is good also as a structure which provides a saucer part also in the front side receiving part 53. FIG. In this case, by providing the wire 57 between the screen body 3 and the front-side connecting shaft portion 52, it is possible to prevent the gap adjusting cylinder 5 from falling off.

  Further, in the above embodiment, when the luminance value detected by the luminance sensor 56 is large, the screen body 3 is moved in the direction close to the screen support 2 and the luminance value detected by the luminance sensor 56 is small. In this case, the screen main body 3 is moved to the side away from the screen support 2, but this is not restrictive. For example, when the luminance value detected by the luminance sensor 56 is large, the other interval adjustment cylinders 5 around the interval adjustment cylinder 5 are reduced, and the luminance value of the image projected on the image projection surface 31 is totally reduced. It is good also as a structure to raise.

  In addition, the configuration in which the outer peripheral edge of the screen body 3 is held by the frame member 4 via a spring 41 as an elastic member is illustrated, but the present invention is not limited to this. Any other configuration may be used as long as the deflection of the screen body 3 can be adjusted by expansion and contraction.

  Furthermore, the outer peripheral edge of the screen body 3 may be fixed to the frame member 4. In this case, the area on which the image is projected on the image projection surface 31 is separated from the outer peripheral edge of the screen main body 3 and the interval adjusting cylinder 5 is not arranged on the outer peripheral edge of the screen main body 3. The rate of change of the curved shape of the image projection surface 31 can be moderated.

  In addition, the specific structure and procedure for carrying out the present invention can be appropriately changed to other structures and the like within a range in which the object of the present invention can be achieved.

  DESCRIPTION OF SYMBOLS 1 ... Movable screen, 2 ... Screen support body, 3 ... Screen main body, 4 ... Frame member, 5 ... Space | interval adjustment cylinder as space | interval adjustment means, 31 ... Image projection surface, 41 ... Spring as elastic member, 52 ... Front side connection shaft part, 53... Front side reception part that also functions as a surface member and reception part, 54... Rear side connection shaft part, 55 ... Back side reception shaft part, 56 ... Luminance sensor, 531 ... Contact surface, 551 ... Receptacle part, 513... Control circuit part as control means.

Claims (5)

A flexible planar screen body;
A screen support provided at a predetermined interval from the screen main body, facing the back surface opposite to the image projection surface on which the image light of the screen main body is projected,
A plurality of provided at a predetermined pitch along the surface direction of the screen main body, bridged between the back surface of the screen main body and the screen support, and extendable in a direction from the screen main body toward the screen support. Interval adjusting means;
A sensor that is provided at a tip of each interval adjusting unit on the screen body side, detects the brightness of image light projected on the image projection surface of the screen body, and outputs a detection signal;
Control means for controlling expansion and contraction of the interval adjusting means according to the detection signal from the sensor;
A movable screen characterized by comprising: The movable screen of claim 1, wherein
The sensor detects a luminance value of image light and outputs a detection signal corresponding to the luminance value;
The movable screen is characterized in that the control means shortens the interval adjusting means corresponding to the portion having the large luminance value and extends the interval adjusting means corresponding to the portion having the small luminance value based on the detection signal. The movable screen according to claim 1 or 2,
From the outer peripheral edge of the screen body, provided at a predetermined interval in the surface direction of the screen body, provided with a frame member surrounding the screen body,
The movable screen, wherein the inner peripheral edge of the frame member and the outer peripheral edge of the screen body are connected by an elastic member. The movable screen according to any one of claims 1 to 3,
The interval adjusting means includes
A connecting shaft extending toward the screen body and the screen support;
The connection shaft portion is connected to one of the screen main body and the screen support body and has a tray portion that is substantially concave, and the connection shaft portion is held by the tray portion so that the distal end portion of the connection shaft portion is movable. A receiving part,
A movable screen characterized by comprising: The movable screen according to any one of claims 1 to 4,
The movable screen is characterized in that the distance adjusting means includes a surface member having an abutting surface fixed to the screen body side end portion so as to face the back surface of the screen body.

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