JPH06317850A - Reflection type screen, adjusting jig and projector - Google Patents

Abstract

PURPOSE:To easily set a projector in a short time by providing a convex mirror member whose curvature in a vertical direction is smaller than that in a horizontal direction at one part of a member constituting a screen and providing a member with which the convex mirror member is covered. CONSTITUTION:A reflection mirror 1 is provided in the center of a pipe-like member 7 and formed to be nearly plane in the horizontal direction and convex in the vertical direction, and formed so that the curvature in the vertical direction is smaller than that in the horizontal direction. In such a case, reflected light by the reflection mirror 1 is necessary to set positional relation but it becomes an obstacle to view an ordinary screen after setting the position. Then, the mirror 1 is covered with a cover 2 so as to prevent the reflected light. The cover 2 is made of a material such as cloth having low reflectance and its one side is connected to the member 1 so that it is opened at the time of setting the position. After finishing the setting, the reflection mirror 1 is covered with the cover 2, and the cover 2 is fixed to the member 7 by a latch 3 constituted of a magnet, etc., so that it is not naturally opened as shown at a cover closing position 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective screen, a jig attached to the screen, and a projector for facilitating the adjustment of the relative positions of the reflective screen and the projector.

[0002]

2. Description of the Related Art In recent years, in corporate presentations, slide projectors, liquid crystal projectors, CRTs, etc.
A large screen display by a projector such as a projector is often used. In general households, it is becoming more and more popular to display video signals on a large screen for viewing, mainly for liquid crystal projectors. In such a place, the projector is usually put away and often taken out and installed only when necessary. The screen may be attached to the ceiling or the wall surface in advance, but like the projector, it is often installed only when necessary.

In such a case, if the positional relationship between the screen and the projector is misaligned, the image quality deteriorates due to distortion of the projected image and blurring of the focus. For example, it is described in Japanese Patent Laid-Open No. 27331/1993. As described above, there has been proposed a method in which a flat reflecting mirror is attached to the lower part of the screen and adjustment is performed while observing the reflected image and reflected light of the lens itself. However, in the above-mentioned publication, since the plane mirror is used and the vertical angle of the reflecting mirror is variable, the visible range of the reflected image and the reflected light is very narrow, and it is not known where it is seen in the vertical direction. However, there is a drawback that the reflecting mirror becomes an obstacle when a normal image is projected, and the practicality is low. In addition, as another method, a method of using a string of a certain length, a method of using a light bulb or the like as a light source, and providing an auxiliary projector in the projector have been proposed, but the versatility is low. Due to the complexity of handling and the cost, it has hardly been put to practical use.

[0004]

Therefore, in many cases, the method as in the prior art is not carried out and the position is set by intuition, so that an unskilled person often cannot make a correct setting. The possible causes are as follows.

The relationship between the projector and the reflective screen is generally designed so that it is installed at a position where the optical axis of the projection lens and the normal line of the screen coincide with each other when seen in a plan view.

FIG. 12 is a plan view of the installation state viewed from above. The image projected by the projector 36 is displayed on the screen 61, but in this figure, the optical axis 42 of the lens of the projector 36 is displayed.
And the normal line 43 of the screen 61 is deviated. In such a case, when a rectangle is projected, it is displayed in a horizontal trapezoidal shape like 62 on the screen 61 as shown in FIG. This occurs because the distance between the lens and the screen is longer on the right side than on the left side. At this time,
Even if the focus is adjusted near the center of the screen 61,
It blurs as it goes to the left and right edges. On the contrary, the installation position of the projector may be determined so that there is no trapezoidal distortion on the screen, but it is difficult to accurately locate the position visually.
Further, when the screen is large, it is more difficult to locate the whole image because it is difficult to grasp the whole image.

Further, when the screen is installed obliquely to the wall surface of the room, there is no object to be compared,
The position of the normal to the screen was difficult to understand, and accurate positioning was often more difficult.

Further, one lens is attached to the front surface of one CRT, and three lenses R, G, and B are arranged in the horizontal direction to form a C.
In RT type projectors, generally, the optical axis of the central lens in the plan view is designed to be aligned with the normal line of the screen. However, in the CRT system,
There is a geometric distortion adjustment function in the deflection system and a convergence system adjustment function, but these are not always the optimum values before installation, so if you look at the distortion of the projected image and position It is not always the correct position. Further, even if these adjustments are made in a non-corrected state, since the deflection system originally has complicated distortion, it is difficult to position the projection image. Furthermore, if installed in a position where the optical axis and the normal line of the screen are deviated from the plan view, the adjustment state of geometrical distortion and convergence will exceed the correction range and adjustment will not be possible, or it will be over level. Therefore, there is a problem that the power consumption of the output circuit increases and the reliability may be deteriorated.

In the actual installation, the vertical positional relationship between the screen and the projector must be taken into consideration.
This is not a problem because it can be easily set by measuring the height from the floor, and once the legs of the screen and the stand of the projector are decided, the reproduction can be done easily.

Therefore, it is an object of the present invention to install a projector in a correct position easily and in a short time when a slide projector, a liquid crystal projector, a CRT projector or the like is projected on a reflection type screen. To do so.

[0011]

According to the present invention, a convex mirror member having a vertical curvature smaller than a horizontal curvature is provided on a part of a member constituting a screen, and a member for covering the convex mirror member is provided. It is characterized by that.

Further, a convex mirror member having a vertical curvature smaller than a horizontal curvature, a supporting member for supporting the convex mirror member, and the convex mirror member and the supporting member are housed in a part of a member constituting a screen. It is characterized in that a structure is provided.

Further, the jig is detachable from the screen, and comprises a convex mirror member having a vertical curvature smaller than the horizontal curvature, and a member fixed to the convex mirror member and detachable from the screen. And

Further, the projector is characterized in that a marking showing the optical axis is provided on a line where a vertical plane including the optical axis of the projection lens and the outside of the housing intersect with each other.

[0015]

【Example】

 (Embodiment 1) FIG. 1 shows a first embodiment of the present invention.

The screen surface 5 is of a so-called bead type and is made of a flexible material.
A pipe-shaped member 7 serving as a weight is provided at the lower portion, and the screen surface 5 is wound around the winding portion 6 when not used.

A reflecting mirror 1 is provided at the center of the pipe-shaped member 7. The reflecting mirror 1 is substantially flat in the horizontal direction and has a convex surface in the vertical direction.

FIG. 8 shows a case where a video signal is projected on this screen. Projection light 37 from the projection lens of the projector 36
Is projected in a so-called overscan that is slightly larger than the vertical direction of the screen surface 5, and the light incident on the reflecting mirror 1 is reflected as reflected lights 38 and 39. Since the reflecting mirror 1 has a convex surface in the vertical direction, the reflected light 3
8 and 39 have a vertical spread, and if the horizontal size of the reflecting mirror 1 is smaller than the aperture of the lens of the projector 36, the horizontal spread of the reflected lights 38 and 39 is narrow. Will be things.

Here, a plan view of FIG. 8 viewed from above is shown in FIGS. In the figure, the adjuster 41 stands behind the lens of the projector 36 and observes the reflecting mirror 1.

The coordinator 41 controls the projector 3 onto the screen surface 5.
When positioning is performed while projecting the image of 6, if the projected image has a size substantially equal to the horizontal direction of the screen,
The optical axis 42 of the lens of the projector 36 can be substantially aligned with the reflecting mirror 1 when seen in a plan view. Here, as shown in FIG. 10, when the optical axis 42 and the normal line 43 of the screen do not match, that is, when the left and right distances of the screen are different, the reflected light 40 is centered on the normal line 43 of the screen. It is reflected in a direction symmetrical to the optical axis 42. At this time, the adjuster 41 can move the position of the head to the left and right to find the position of the reflected light 40. Since the reflected light 40 is very bright as compared with the image on the screen surface, it can be easily found. In the case of FIG. 10, when the reflected light 40 is detected on the right side, it can be seen that the screen surface 5 is distant from the right side and close to the left side. Therefore, it can be seen that the projector 36 is located on the left side with respect to the screen surface 5. . Therefore, the projector 3
6 to the right, and the reflected light 40 causes the projector 36 to move as shown in FIG.
If you find a position directly above or below the lens of,
You can easily set the correct positional relationship.

Here, description will be made again with reference to FIG. As described above, the reflected light of the reflecting mirror 1 is necessary to set the positional relationship, but after setting, it interferes with viewing a normal screen. Therefore, the cover 2 may cover the reflecting mirror 1 to block the reflected light. Cover 2
A pipe-shaped member 7 with one side made of low-reflectance cloth
When the position is set, it opens as shown in FIG. 1, and after completion, as shown by the cover closing position 4, it covers the reflecting mirror 1 and further by the latch 3 composed of a magnet or the like, It is fastened to the pipe-shaped member 7 so as not to open naturally.

When the pipe-shaped member 7 is made of metal, the reflecting mirror 1 described in this embodiment can also be used by plating the surface. Further, in the present embodiment, the case where there is one projection lens has been described, but it is clear that even in the case of a CRT system in which three lenses are lined up, if the center lens is focused on, it can be installed as described above. .

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. The screen surface 12 is a flat reflective screen and is held by a frame 13. At the bottom of the frame 13,
There is a recess provided in the back direction, and inside is provided a reflecting mirror 8 having a substantially flat horizontal direction and a convex surface in the vertical direction.

Since the method of adjusting the reflected light is the same as that of the first embodiment, its explanation is omitted.

The cover 9, which also closes the reflecting mirror 8 when viewing a normal screen, is made of a metal plate coated with a low-reflecting paint, and one side of the cover 9 is attached to the frame 13 by a hinge. . When the position is set, the latch 10 is opened as shown in FIG.
So that it does not open naturally, it is fastened to the frame 13.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention. The screen surface 18 is a curved type reflective screen and is fixed to the frame 19. At the bottom of the frame 19, there is an indentation provided in the back direction, and inside is a reflecting mirror 14 having a substantially flat horizontal direction and a convex surface in the vertical direction.
Is provided.

The method of adjusting the reflected light for viewing is the same as that of the first embodiment, and the description thereof will be omitted.

The cover 15, which also closes the reflecting mirror 14 when viewing a normal screen, is made of a metal plate coated with a low-reflectance paint, and one side thereof is attached to the frame 19 by a hinge. . When the position is set, the cover is opened as shown in FIG. 3, and after the position is closed, the reflecting mirror 14 is covered as shown by the cover closing position 17, and the latch 16 formed of a magnet or the like prevents the cover from being opened naturally. Fasten to frame 19.

As described above, in the first, second and third embodiments, the case where the reflecting mirror is provided on the lower part of the screen has been described, but it is clear that it may be provided on the upper part of the screen.

(Embodiment 4) FIG. 4 shows a fourth embodiment of the present invention. The screen surface 25 is a flat reflective screen and is fixed to the frame 26. A recess is provided in the lower portion of the frame 26, and one end of the support member 21 is fixed by a shaft so as to draw an arc. Although not shown, a latch mechanism is provided so that the support member 21 can be fixed at a specific angle against gravity. ing. The reflecting mirror 20 is provided on the other end of the support member 21,
At the specific angle mentioned above, the horizontal direction is almost flat,
It is mounted at an angle that makes a convex surface in the vertical direction.

With such a configuration, the screen surface 25
Since the reflecting mirror 20 can be positioned near the center of the, the reflected light can be obtained even when the screen is projected smaller than the screen frame 26.

After adjusting the position of the projector, the support member 21 is
If you put it in the storage position 22, you can enjoy the normal screen, but in order to avoid dust, put the lid 23 on.
Close as shown by trajectory 24.

In FIG. 4, the case where the storage position is provided in the lower portion has been described, but it may be provided in either the upper portion or the left and right portions.

Further, in FIG. 4, the case where the screen surface 25 is a flat surface has been described, but a curved type can also be used. At this time, the surface of the reflecting mirror 20 does not need to be in focus, so there is no problem even if the reflecting mirror 20 is separated from the screen surface 25.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment. The reflecting mirror 27 has a substantially flat surface in the horizontal direction and a convex surface in the vertical direction. The reflecting mirror 27 is fixed to the support member 28 such that the tangent line in the horizontal direction is parallel to the support member 28, and both ends of the support member 28 are fixed clampers 2 respectively.
9 is connected. The fixed clamper 28 has a fulcrum 31
It is connected to the movable clamper 30 via the, and a force in a closing direction is applied to both by a spring (not shown). One end of the fixed clamper 29 forms a fixed force point 32, and one end of the movable clamper 30 forms a movable force point 33. When the fixed force point 32 and the movable force point 33 are pinched with a finger, the fixed clamper 29 and the movable clamper 30 are separated. It opens and moves to close when you release your finger.

The screen surface 35 and the frame 34 respectively show a part. Here, the fixed force points 32 and the movable force points 33 on both sides are respectively pinched and sandwiched in the frame 34 so that the frame 34 contacts the fulcrum 31 side of the fixed clamper 29.
With the release of the finger, the support member 28 can be mounted substantially parallel to the frame 34. Since the support member 28 and the reflecting mirror 27 are fixed in parallel with each other in the horizontal direction, the horizontal direction of the frame 34 and the reflecting mirror 27 is also parallel.

If the screen is attached to the center of the frame with such a structure, the position of the projector can be adjusted in the same manner as described in the first, second and third embodiments.

(Embodiment 6) When a video signal is projected from a projector onto the center of a special screen that is long in the horizontal direction,
The left and right sides of the screen are underscanned. In such a case, as shown in FIG. 11, the optical axis 42 of the projector 36 may not be aligned with the position of the reflecting mirror 1 and may be installed obliquely.

FIG. 6 shows another embodiment. A marker 52 printed on the housing is provided directly above the optical axis of the projection lens 51 of the projector 36. The adjuster can always direct the optical axis 42 toward the reflecting mirror 1 by positioning while extending the extension line of the marker 52 toward the reflecting mirror 1. Therefore, there is no inconvenience as described above, and accurate installation is possible. It is possible.

(Embodiment 7) FIG. 7 shows another embodiment.
A marker 53 in which a part of the housing is formed in a convex shape is provided at a position directly above the optical axis of the projection lens 51 of the projector 36. If positioning is performed while directing the extension of the line connecting the marker 53 to the reflecting mirror 1, accurate installation can be performed as described above.

[0041]

As described above, according to the present invention,
By providing a reflecting mirror on a part of the reflective screen,
When projecting a slide projector, liquid crystal projector, CRT projector, etc., the projector can be easily installed in the correct position in a short time, and the projected image is distorted or the left and right focus of the screen is blurred. It is possible to avoid such a deterioration factor of image quality. further,
Since the curvature of the reflecting mirror is made smaller in the vertical direction than in the horizontal direction, the reflected light has a spread in the vertical direction, so no matter what the positional relationship between the screen and the projector in the vertical direction,
It can be adopted independently.

Further, in the case of a CRT projector, distortion correction and convergence correction must be performed, but even in this case, if the CRT projector is installed in an incorrect position, it becomes impossible to perform adjustment beyond the adjustment range, or an excessive level is set. By adjusting the above, it is possible to avoid the inconvenience that wasteful power consumption is increased and the reliability of the circuit is lowered.

Even if the screen is not provided with a reflecting mirror in advance, the same adjustment can be performed by attaching the jig according to the present invention.

Further, even in the case of underscan, the optical axis of the projection lens is known by the marker provided on the projector, so that the correct adjustment can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a fifth embodiment of the present invention.

FIG. 6 is a diagram showing an embodiment of claim 5 of the present invention.

FIG. 7 is a diagram showing another embodiment of claim 5 of the present invention.

FIG. 8 is a diagram illustrating reflected light according to the present invention.

FIG. 9 is a plan view illustrating reflected light according to the present invention.

FIG. 10 is a plan view illustrating reflected light according to the present invention.

FIG. 11 is a plan view illustrating reflected light according to the present invention.

FIG. 12 is a plan view showing an installation state according to a conventional example.

FIG. 13 is a diagram showing a projection image according to a conventional example.

[Explanation of symbols]

 1, 8, 14, 20, 27 Reflector 2, 9, 15 Cover 3, 10, 16 Latch 4 Cover shut-off position 5, 12, 18, 25 Screen surface 6 Roll-up part 7 Pipe-shaped member 13, 19, 26 Frame 21 Support Member 22 Storage Position 23 Lid 24 Trail of Lid 28 Support Member 29 Fixed Clamper 30 Movable Clamper 31 Support Point 32 Fixed Force Point 33 Movable Force Point 34 Frame 35 Screen Surface 36 Projector 37 Projected Light 38, 39 Reflected Light 40 Reflected Light 41 Adjuster 42 Optical axis of lens 43 Screen normal 52, 53 Marker 61 Screen 62 Projected image

Claims (5)

[Claims] 1. A reflection type screen, characterized in that a convex mirror member having a vertical curvature smaller than a horizontal curvature is provided on a part of a member constituting the screen. 2. The reflective screen according to claim 1, further comprising a member that covers the convex mirror member. 3. A convex mirror member having a vertical curvature smaller than a horizontal curvature, a support member for supporting the convex mirror member, and the convex mirror member and the support member housed in a part of a member constituting a screen. A reflective screen characterized by having a structure that 4. An adjusting jig comprising a convex mirror member having a vertical curvature smaller than a horizontal curvature and a clamper-like member fixed to the convex mirror member and detachable from a screen. 5. A projector characterized in that a marking indicating the optical axis is provided on a line where a vertical plane including the optical axis of the projection lens and the outside of the housing intersect.