JP2003057743A - Method and system for correcting projection angle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection angle correction system which is inexpensive because of a simple constitution and automatically adjusts the distinction of an image. SOLUTION: The system is constituted of a screen device 3 on which the image is projected to detect infrared rays and a projector 10 which projects the image on the screen device, and the projector is provided with an infrared ray radiation means 7 which irradiates a lot of different positions of the screen device by infrared rays, a means which detects arrival time differences of infrared rays to the screen device, a revolving shaft 8 which rotates a lens and the infrared ray radiation means of the projector in accordance with arrival time differences of infrared rays, and a revolving shaft control means 5 which controls the infrared ray radiation means on the basis of the arrival time differences of infrared rays to the screen device to vertically adjust the radiation position of infrared rays radiated to the screen device, and thus the radiation position in the vertical direction of infrared rays to the screen is automatically adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection angle correction system and a projection angle correction method for projecting an image on a screen by using a projector to make the entire image projected on the screen clear.

[0002]

2. Description of the Related Art In a conventional system for projecting an image on a screen using a projector, if the left and right or up and down projection angles are deviated, the projected image has a difference in left and right or up and down. Conventionally, a user of a projector adjusts the image of the entire screen by changing the position and angle of the projector itself or the screen itself by looking at the sharpness of the images displayed on the screen from the projector up and down and left and right. It was

Further, as shown in FIG.
The conventional autofocus projector disclosed in Japanese Patent No. 61072, in addition to a prism for irradiating an image, is a dedicated prism for irradiating light in the out-of-view region and a light-receiving element for receiving light in the out-of-view region reflected from the screen and a light-receiving element. A photoelectric conversion element for converting light received by the element into an electric signal is provided, and the angle of the projection lens or prism is changed depending on the position of the light receiving element, so that the focus is adjusted pixel by pixel.

[0004]

However, in the conventional autofocus projector as described above, in addition to the prism for projecting the image, a prism for exclusive use of irradiating light in the out-of-view region and a prism for the out-of-view region reflected from the screen are provided. In order to receive light through the prism and irradiate the light-receiving element with light in the non-visual range to focus from the position of the light-receiving element,
There is a problem that the device is complicated and expensive.

The present invention has been made to solve such a problem, and has a simple structure, is inexpensive, and is capable of automatically adjusting the sharpness of an image, and a projection angle correction system and a projection angle correction method. Is provided.

[0006]

A projection angle correction system according to the present invention has a screen device for detecting infrared rays and projecting an image, and a projection device for projecting an image on the screen device. Is an infrared irradiating means for irradiating the screen device with infrared rays at a plurality of different positions, a detecting means for detecting a difference in arrival time of the plurality of infrared rays irradiating the screen device, and fixed to an end portion of a lens of the projection device. A rotation axis for controlling the rotation of the lens and the rotation of the infrared irradiation means, and an irradiation position of infrared rays irradiated to the screen device by controlling the rotation axis based on the arrival time difference of a plurality of infrared rays to the screen device. And a rotary shaft control means for adjusting the screen device in the vertical direction.
With this configuration, the angle of the lens can be driven upward or downward depending on the time difference between the infrared rays radiated to the screen from the left and right infrared radiating means, and the vertical angle of the image projected on the screen can be automatically adjusted. .

In the projection angle correction method according to the present invention, infrared rays are emitted from the infrared ray irradiating means to a plurality of different positions of the screen device, the arrival time differences of the plurality of infrared rays detected by the screen device are detected, and the plurality of infrared rays are detected. It is configured to have the steps of controlling the infrared irradiation means based on the arrival time difference and adjusting the irradiation position of the infrared rays applied to the screen device in the vertical direction of the screen device. With this configuration, the angle of the lens can be driven upward or downward depending on the time difference between the infrared rays radiated to the screen from the left and right infrared radiating means, and the vertical angle of the image projected on the screen can be automatically adjusted. .

A screen device according to the present invention is the projection angle correction system according to claim 1, wherein the screen device detects a screen for projecting an image, a tripod leaning against the screen, and infrared rays from the projection device. And a detection means.
With this configuration, the detection means of the projection device can recognize the arrival time of the infrared light emitted to the screen device.

The projection apparatus according to the present invention is an infrared irradiating means for irradiating infrared rays to a plurality of different positions on the screen apparatus for detecting infrared rays, and an infrared irradiating section for controlling infrared ray irradiation to the infrared irradiating means. Control means, detection means for detecting a difference in arrival time of a plurality of infrared rays radiated to the screen device, and rotation fixedly fixed to the infrared radiation means to adjust the irradiation of infrared rays to the screen device in the vertical direction of the screen device. A configuration is provided that includes a rotation axis and a rotation axis control unit that controls the rotation axis based on a difference in arrival time of a plurality of infrared rays with respect to the screen device to vertically adjust an irradiation position of infrared rays with which the screen device is irradiated. Have With this configuration, the angle of the lens can be driven upward or downward depending on the time difference between the infrared rays radiated to the screen from the left and right infrared radiating means, and the vertical angle of the image projected on the screen can be automatically adjusted. .

According to the projection angle correction method of the present invention, the step of irradiating the infrared ray and the infrared ray irradiating means are controlled when the arrival time difference of the plurality of infrared rays detected from the screen device is reduced to a certain amount. It has a configuration including a step of stopping the step of adjusting the irradiation position of infrared rays with which the screen device is irradiated in the vertical direction of the screen device. With this configuration, it can be determined that the vertical balance of the image projected on the screen is completed.

In the projection angle correction method according to the present invention, the infrared irradiation position irradiated to the screen device is controlled by individually controlling the infrared irradiation means based on the detected arrival time difference of the infrared rays. It has a configuration including a step of individually adjusting the device in the vertical direction. With this configuration, it is possible to optimize the vertical position where the image is projected on the screen.

The projection angle correction system in the present invention is
The detecting means detects a plurality of infrared ray irradiation amount differences with which the screen device is irradiated, and the rotation axis control means controls the rotating shaft based on the plurality of infrared ray irradiation amount differences with respect to the screen device, thereby the screen. The device has a configuration in which the irradiation position of infrared rays with which the device is irradiated is adjusted in the vertical direction of the screen device. With this configuration, the angle of the lens is driven upward or downward depending on the difference in the amount of infrared rays emitted to the screen from the left and right infrared ray emitting means, and the vertical angle of the image projected on the screen is automatically adjusted. be able to.

In the projection angle correction method according to the present invention, infrared rays are emitted from the infrared ray emitting means to a plurality of different positions of the screen device, the difference in the irradiation amount of the infrared rays detected by the screen device is detected, and the plurality of the plurality of infrared rays are detected. It is configured to have each step of controlling the infrared irradiation means based on the difference in the irradiation amount of infrared rays and adjusting the irradiation position of the infrared rays applied to the screen device in the vertical direction of the screen device. With this configuration, the angle of the lens is driven upward or downward depending on the difference in the amount of infrared rays emitted to the screen from the left and right infrared ray emitting means, and the vertical angle of the image projected on the screen is automatically adjusted. be able to.

In the projection apparatus according to the present invention, the detection means detects the difference in the irradiation amount of the infrared rays with which the screen device is irradiated, and the rotation axis control means is based on the difference in the irradiation amount of the infrared rays with respect to the screen device. The rotary shaft is controlled to adjust the irradiation position of infrared rays irradiated to the screen device in the vertical direction of the screen device. With this configuration, the angle of the lens is driven upward or downward depending on the difference in the amount of infrared rays emitted to the screen from the left and right infrared ray emitting means, and the vertical angle of the image projected on the screen is automatically adjusted. be able to.

The projection angle correction method according to the present invention controls the step of irradiating the infrared ray and the infrared ray irradiating means when the difference in the irradiation amount of the plurality of infrared rays detected from the screen device decreases to a certain amount. It has the structure of having the process of stopping the process of adjusting the irradiation position of the infrared rays with which the screen device is irradiated in the vertical direction of the screen device. With this configuration, it can be determined that the vertical balance of the image projected on the screen is completed.

The projection angle correction system in the present invention is
The infrared ray detecting means, a tripod for leaning the screen, and a rotating shaft means for rotating the axis of the tripod are provided, and the screen device includes a screen device for projecting an image and a projection device for projecting the image on the screen device. The apparatus includes infrared irradiation means for irradiating the screen device with infrared rays at a plurality of different positions, infrared irradiation control means for controlling the irradiation of infrared rays by the infrared irradiation means, and arrival of a plurality of infrared rays irradiated on the screen device. Detection means for detecting a time difference, and rotation axis control means for rotating the rotation axis means based on arrival time differences of a plurality of infrared rays with respect to the screen device and adjusting an irradiation angle in the left-right direction of the infrared rays emitted to the screen device. Is provided. With this configuration, the horizontal direction of the screen can be automatically adjusted according to the time difference between the infrared rays emitted from the left and right infrared ray irradiating means to reach the screen device.

In the projection angle correcting method according to the present invention, infrared rays are emitted from the infrared ray irradiating means to a plurality of different positions of the screen apparatus, the arrival time differences of the infrared rays detected by the screen apparatus are detected, and the plurality of infrared rays are detected. According to the arrival time difference, the axis of the tripod of the screen device is rotated in the left-right direction to adjust the irradiation angle of the infrared light with which the screen device is irradiated in the left-right direction. With this configuration, the horizontal direction of the screen can be automatically adjusted according to the time difference between the infrared rays radiated to the screen from the left and right infrared radiating means to reach the screen.

A screen device according to the present invention is the projection angle correction system according to claim 11, wherein the screen device is a screen for projecting an image, a tripod for leaning the screen, and a rotary shaft for rotating the axis of the tripod. And a detecting means for detecting infrared rays emitted from the projection device. With this configuration, the left and right directions of the screen can be automatically adjusted by the control of the rotation axis control means of the projection apparatus.

The projection apparatus according to the present invention comprises an infrared irradiating means for irradiating the screen apparatus for detecting infrared rays with infrared rays at a plurality of different positions on the screen apparatus, and an infrared irradiating section for controlling infrared ray irradiation for the infrared irradiating section. Control means, detection means for detecting arrival time differences of a plurality of infrared rays radiated to the screen device, and a rotary shaft that rotates the axis of a tripod of the screen device in the left-right direction based on the arrival time differences of the plurality of infrared rays to the screen device. And a rotation axis control means for adjusting the horizontal irradiation angle of infrared rays with which the means is rotated to irradiate the screen device. With this configuration, the horizontal direction of the screen can be automatically adjusted according to the time difference between the infrared rays radiated to the screen from the left and right infrared radiating means to reach the screen.

In the projection angle correction method according to the present invention, the step of irradiating the infrared rays and the infrared ray irradiating means are controlled by controlling the infrared ray irradiating means when the arrival time difference of the plurality of infrared rays detected from the screen device is reduced to a certain amount. It has a configuration including a step of stopping the step of adjusting the horizontal irradiation angle of infrared rays with which the screen device is irradiated. With this configuration, it can be determined that the vertical balance of the image projected on the screen is completed.

In the projection angle correction method according to the present invention, the positions of the infrared irradiating means are individually controlled in the left and right directions based on the detected arrival time differences of the plurality of infrared rays, and the left and right directions of the infrared rays irradiated to the screen device are controlled. It has a configuration including a step of individually adjusting the irradiation position of 1) in the left-right direction of the screen device. With this configuration, the left and right positions at which the image is projected on the screen can be optimized.

The projection angle correction system in the present invention is
The detecting means detects a plurality of infrared ray irradiation amount differences with which the screen device is irradiated, and the rotating shaft control means controls the rotating shaft means based on the plurality of infrared ray irradiation amount differences with respect to the screen device. It has a configuration of adjusting the horizontal irradiation angle of infrared rays with which the device is irradiated. With this configuration, the horizontal direction of the screen can be automatically adjusted based on the difference between the right and left irradiation amounts applied to the screen.

In the projection angle correction method according to the present invention, infrared rays are emitted from the infrared ray irradiating means to a plurality of different positions of the screen device, and the plurality of infrared ray irradiation amount differences detected in the screen device are detected to detect the plurality of the infrared rays. It is configured to have respective steps of rotating the axis of a tripod of the screen device in the left-right direction based on the difference in the irradiation amount of the infrared rays to adjust the irradiation angle in the left-right direction of the infrared rays applied to the screen device. With this configuration, the horizontal direction of the screen can be automatically adjusted based on the difference between the right and left irradiation amounts applied to the screen.

The projection angle correction method according to the present invention controls the step of irradiating the infrared ray and the infrared ray irradiating means when the difference in the irradiation amount of the plurality of infrared rays detected from the screen device decreases to a certain amount. It has a configuration including a step of stopping a step of adjusting a horizontal irradiation angle of infrared rays with which the screen device is irradiated. With this configuration, it can be determined that the left-right balance of the image projected on the screen is completed.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first and second embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, the configuration of a projection angle correction system according to the first embodiment of the present invention will be described with reference to FIG. The projection angle correction system according to the present embodiment includes a projection device 10 for projecting a video signal and a screen device 3 for projecting an image on a screen. The screen device 3 includes a screen 1 for projecting an image and a screen 1. It has a tripod 2 that leans against it. Further, the projection apparatus 10 inspects the lens 9 for projecting an image, the two left and right rotating shafts 8 fixed to the lens 9 and rotating in the same direction, and the upper and lower directions of the screen 1 fixed to the rotating shafts 8, respectively. 2 left and right infrared irradiating parts 7 adjusted to irradiate infrared rays for use, and the time until the infrared irradiating the upper part and the lower part of the screen 1 from the two right and left infrared irradiating parts 7 reach the screen 1 are detected. , The upper and lower time differences are compared with each other, and the time difference is converted into a distance, which is used as rotation control data.
And a rotation axis control section 5 for rotating two left and right rotation axes 8 according to rotation control data from the detection section 4,
An infrared irradiation control unit 6 that controls the irradiation amount of the two left and right infrared irradiation units 7 to detect the time difference between the left and right infrared rays that reach the upper portion and the lower portion of the screen 1 according to an instruction from the detection unit 4. .

Next, the operation of the projection angle correction system according to the first embodiment of the present invention will be described with reference to FIG. The system according to the present embodiment is a system for correcting a projection angle by a projection device 10 that projects a video signal onto the screen 1 of the screen device 3 through the lens 9, and is provided on the lens 9 and the left and right sides of the lens 9, respectively. The two infrared irradiating parts 7 and the two rotating shafts 8 fixed to the lens 9 and the infrared irradiating part 7 and rotating in the same direction are provided, and the infrared irradiating part 7 is controlled by the infrared irradiating control part 6. The screen 1 is driven to emit infrared rays. Further, the two infrared irradiation units 7 on the left and right sides are the screen 1
Is set to irradiate vertically and horizontally to the left and right of the screen. For example, the left infrared irradiator 7 irradiates the lower left of the screen 1 and the right infrared irradiator 7 irradiates the upper right of the screen 1 in advance. I am doing it. Detection unit 4
Detects the time required for two left and right infrared rays radiated in the upward and downward directions of the screen 1 to reach the screen 1, compares the difference between the upper and lower infrared rays, and converts the time difference into a distance to control rotation. The data is sent to the rotary shaft control unit 5, and the rotary shaft 8 is rotated so as to eliminate the time difference. The rotation axis control unit 5 rotates the rotation axis 8 provided on the left and right of the lens 9 according to the rotation control data. Further, in order to perform time control, the irradiation amount from the left and right infrared irradiation units 7 is controlled by sending an infrared irradiation amount instruction from the detection unit 4 to the infrared irradiation control unit 6, and the infrared irradiation amount reaching the screen 1 is controlled. Is detected, and the time difference of the infrared rays reaching the corresponding screen 1 is detected. Detection unit 4
Repeatedly instruct infrared irradiation until the time difference between the upper and lower sides reaches a certain level.

In this way, when the irradiation timing of the infrared rays from the infrared irradiation section 7 is corrected, the lens 9 is fixed in that position state, and the time difference between the left and right until the image reaches the screen 1 is stabilized. The image can be projected in the state. It should be noted that the projection angle correction operation by the projection angle correction system according to the present embodiment can be performed together with the actual projection using the lens, or can be switched to the actual projection after correcting the projection angle. Further, the screen device 3 includes means for projecting an image and detecting infrared rays, and further includes a tripod 2 for leaning the screen 1, and the detected infrared signal is detected by the detecting section 4
Work to tell.

As described above, according to the projection angle correction system and the projection angle correction method in the first embodiment of the present invention, the two infrared irradiation units 7 are fixed to the left and right of the lens 9, and the lens 9 and the left and right sides are fixed. Two rotary shafts 8 were fixed between the two infrared irradiation parts 7, and infrared rays were irradiated from the two infrared irradiation parts 7 to the upper part and the lower part of the screen 1, and the upper part and the lower part of the screen 1 were irradiated. By rotating the rotation axis 8 by the rotation axis control unit 5 according to the arrival time difference between the left and right infrared rays to correct the projection angle with respect to the screen 1, the projection angle of the image passing through the lens 9 is corrected and projected onto the screen 1. You can automatically adjust the sharpness of the upper and lower images.

The screen device 3 includes the screen 1
It is possible to construct a projection angle correction system that is configured to project an image, detect infrared rays, and transmit the detected infrared signal to the detection unit 4 of the projection device 10. In addition, the projection device 10 includes the screen 1 of the screen device 3.
It is possible to construct a projection angle correction system configured to rotate the rotary shaft 8 from the rotary shaft control unit 5 according to the arrival time difference between the left and right infrared rays radiated on the.

When the difference between the arrival times of the left and right infrared rays radiated on the screen 1 reaches a certain amount or less, it is judged that the correction of the projection angle is completed, and the infrared ray radiating section 7 radiates the infrared ray and the rotary shaft 8 controls the rotation. After that, since the angles of the upper and lower images projected on the screen 1 are stabilized after that, the images can be viewed stably.

Further, when the infrared rays from the two left and right infrared ray irradiating units 7 irradiating the screen 1 cannot be detected by the detecting unit 4, the detecting unit 4 sends an instruction without infrared ray to the rotary axis control unit 5. Rotation axis control unit 5 that received an instruction to use no infrared light
Changes the irradiation angle of one or both of the infrared irradiation units 7 which are not irradiated to the rotating shaft 8 stepwise. In the initial stage, the infrared irradiation unit 7 has asymmetrical upper and lower irradiation angles which strike the upper and lower sides of the screen 1 (screen 1
The detection unit 4 issues an instruction to the rotating shaft control unit 5 so that the distance from the upper and lower ends to the inside becomes vertically equivalent, and the rotating shaft control unit 5 drives the rotating shaft 8 to rotate independently left and right. It is possible to reliably project the image on the screen 1. In this case, the attachment between the lens 9 and the rotary shaft 8 should normally be fixed by, for example, a semi-fixed system (for example, detachably fixed by the control of the detection unit 4). Good.

Further, the infrared ray irradiating section 7 is provided on the left and right sides of the lens 9, and the lens 9 and the infrared ray irradiating section 7 are fixed by the rotating shaft 8. According to the corresponding), the rotation axis control unit 5 can be configured to rotate the rotation axis 8 to change the projection angle of the image that has passed through the lens 9, whereby the sharpness of the image projected on the top and bottom of the screen 1 can be changed. Can be automatically adjusted. In addition, the projection device 10 has a screen 1
It is possible to construct a projection angle correction system configured to rotate the rotary shaft 8 by the rotary shaft control unit 5 in accordance with the difference in the irradiation amount of the left and right infrared rays radiated on the.

When the difference in the amount of irradiation of the left and right infrared rays irradiated on the screen 1 reaches a certain amount, it is determined that the correction of the projection position is completed, and the infrared irradiation and the rotation control of the infrared irradiation unit 7 are stopped. After that, by stabilizing the angle of the entire image projected on the screen 1, the image can be stably viewed.

Next, the configuration of the projection angle correction system according to the second embodiment of the present invention will be described with reference to FIG. The projection angle correction system according to the present embodiment is different from that according to the first embodiment in that a rotation shaft means 11 is provided on the tripod 2 so that the tripod 2 which leans the screen 1 can rotate. Other components shown in FIG. 2 are the same as those shown in FIG.

Next, in the operation of the projection angle correction system and the projection angle correction method according to the second embodiment of the present invention, two left and right infrared rays radiated on the left and right parts of the screen 1 of the screen device 3 are irradiated. The detection unit 4 detects a time difference in the left-right direction of the screen 1 based on the time difference until reaching the screen 1, and controls the rotation axis control unit 5 based on the time difference to move the rotation axis means 11 of the tripod 2 of the screen device 3 to the left or right. By rotationally driving the screen 1, the sharpness of the two infrared rays emitted to the left and right of the screen 1, that is, the sharpness of the projected left and right images can be automatically adjusted.

As described above, according to the projection angle correction system and the projection angle correction method in the second embodiment of the present invention, the screen device 3 projects an image and detects infrared rays, and irradiates the screen 1 with the infrared rays. Left and right 2
The projection angle of the screen 1 in the left-right direction is corrected by controlling the rotation axis control unit 5 by the time difference until the two infrared rays reach the screen 1 and rotating the axis of the tripod 2 which leans the screen 1 in the left-right direction. The system can be built.

Further, the projection apparatus 10 rotates the axis of the tripod 2 in the left-right direction by rotating the rotation axis means 11 by the rotation axis control section 5 in accordance with the arrival time difference between the two left and right infrared rays applied to the screen 1. It is possible to construct a system for correcting the projection angle of the screen 1 in the left-right direction. Further, when the arrival time difference between the two left and right infrared rays irradiated on the screen 1 reaches a certain amount, it is judged that the correction of the projection angle in the left and right direction is completed, and the irradiation of infrared rays and the rotation control of the rotary shaft means 11 are stopped. After that, screen 1
By stabilizing the angle of the entire image projected on, the image can be viewed stably.

When the detection unit 4 cannot detect the two left and right infrared rays applied to the screen 1, the detection unit 4 sends an instruction to the rotation axis control unit 5 that there is no infrared light. The rotation axis control unit 5 that received the instruction to not emit infrared light contracts or extends one or both rotation shafts 8 that were not irradiated to the screen 1 in the left-right direction, and the infrared irradiation from the infrared irradiation unit 7 causes the left and right sides of the screen 1 to move. The detection unit 4 issues an instruction to the rotary shaft control unit 5 so that the distance (the distance entering from the right end or the left end of the screen 1 to the inside) of the screen 1 becomes equal, and the rotary shaft control unit 5 contracts the rotary shaft 8 independently left and right. Alternatively, by extending the image, the image can be reliably projected on the screen 1.

The left and right infrared rays radiated to the upper and lower parts of the screen 1 rotate the rotary shaft means 11 of the tripod 2 to the left or right due to the difference in the amount of irradiation applied to the screen 1, so that the screen 1 can be rotated. The sharpness of the projected left and right images can be automatically adjusted. Further, when the difference in the irradiation amount of the left and right infrared rays irradiated on the screen 1 reaches a certain amount, it is determined that the correction of the left and right projection angles is completed,
Since the irradiation of infrared rays and the rotation control of the rotating shaft means 11 of the tripod 2 are stopped, the angles of the upper and lower images projected on the screen 1 are stabilized thereafter, so that the images can be viewed stably. .

As described above, according to the embodiment of the present invention, a dedicated prism is not required, and a difference in the amount of infrared rays radiated from the left and right infrared radiating portions to the upper, lower, left and right sides of the screen and the arrival at the screen. The time difference is detected by the detection unit, the lens is rotated up and down by changing the projection angle of the image so that the difference is eliminated, and by rotating the screen left and right, the image projected on the screen from any direction is projected. The angle can be automatically adjusted easily and inexpensively to make the image projected on the entire screen clear.

[0041]

The projection angle correction system according to the present invention is configured as described above, and in particular, the projection amount of infrared rays radiated from the two left and right infrared radiating units or the arrival time to the screen is compared to the left and right. The difference is detected, and the rotation axis of the lens is controlled by rotating the rotation axis of the lens according to the detected difference in the irradiation amount of the left and right infrared rays or the arrival time difference, and the rotation axis means of the screen is rotated left and right. Then, by controlling the horizontal rotation position of the screen, the vertical and horizontal contrast of the image projected on the screen device and the sharpness of the vertical and horizontal images can be automatically adjusted to stabilize. You can watch the video.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a projection angle correction system according to a first embodiment of the present invention,

FIG. 2 is a block diagram showing a configuration of a projection angle correction system according to a second embodiment of the present invention,

FIG. 3 is a block diagram showing a configuration of a conventional autofocus projector.

[Explanation of symbols]

1 screen 2 tripod 3 screen device 4 detector 5 Rotation axis control unit 6 Infrared irradiation control section 7 Infrared irradiation part 8, 11 rotation axis 9 lenses 10 Projection device 11 Rotating shaft means

Claims (19)

[Claims] 1. A screen device for detecting an infrared ray and projecting an image, and a projection device for projecting an image on the screen device, wherein the projection device has infrared rays at a plurality of different positions with respect to the screen device. Infrared irradiating means for irradiating, the detecting means for detecting the arrival time difference of a plurality of infrared rays irradiating the screen device, the rotation of the lens and the rotation of the infrared irradiating means fixed to the end of the lens of the projection device. Rotation axis control means for controlling the rotation axis based on the control of the rotation axis and the arrival time difference of a plurality of infrared rays to the screen apparatus, and adjusting the irradiation position of the infrared rays irradiated to the screen apparatus in the vertical direction of the screen apparatus. A projection angle correction system comprising: 2. Infrared irradiation means irradiates a plurality of different positions of a screen device with infrared rays to detect a difference in arrival times of the plurality of infrared rays detected by the screen device, and the infrared rays are detected based on the difference in arrival times of the plurality of infrared rays. A projection angle correction method, comprising: each step of controlling an irradiation unit to adjust an irradiation position of infrared rays applied to the screen device in a vertical direction of the screen device. 3. The projection angle correction system according to claim 1, wherein the screen device includes a screen that projects an image, a tripod that leans against the screen, and a detection unit that detects infrared rays from the projection device. A screen device characterized by the above. 4. An infrared irradiating unit for irradiating infrared rays to a plurality of different positions of the screen unit with respect to a screen unit for detecting infrared rays, and an infrared irradiating control unit for controlling irradiation of infrared rays to the infrared irradiating unit, Detection means for detecting the arrival time difference of a plurality of infrared rays radiated to the screen device, a rotary shaft fixed to the infrared radiating means and rotating to adjust the irradiation of infrared rays to the screen device in the vertical direction of the screen device, A projection apparatus, comprising: a rotation axis control unit that controls the rotation axis based on a difference in arrival time of a plurality of infrared rays with respect to the screen apparatus and adjusts an irradiation position of the infrared rays irradiated to the screen apparatus in a vertical direction. 5. An infrared ray radiated to the screen device by controlling the step of irradiating the infrared ray and the infrared ray irradiating means when the arrival time difference of a plurality of infrared rays detected from the screen device decreases to a certain amount. 3. The projection angle correction method according to claim 2, further comprising the step of stopping the step of adjusting the irradiation position in the vertical direction of the screen device. 6. A plurality of infrared irradiating means are individually controlled based on the detected arrival time differences of the plurality of infrared rays to individually irradiate the screen device with infrared light irradiation positions in the vertical direction of the screen device. The projection angle correction method according to claim 2, further comprising an adjusting step. 7. The detecting means detects a difference in the irradiation amount of a plurality of infrared rays with which the screen device is irradiated, and the rotation axis control means controls the rotating shaft based on the difference in the irradiation amount of a plurality of infrared rays with respect to the screen device. The projection angle correction system according to claim 1, wherein the irradiation position of the infrared rays with which the screen device is irradiated is adjusted in the vertical direction of the screen device. 8. An infrared ray irradiating means irradiates a plurality of different positions of the screen device with infrared rays to detect a difference in irradiation amount of the plurality of infrared rays detected by the screen device,
Projection angle including each step of controlling the infrared irradiation means based on the difference in the irradiation amount of the plurality of infrared rays to adjust the irradiation position of the infrared rays applied to the screen device in the vertical direction of the screen device. Correction method. 9. The detecting means detects a difference in the irradiation amount of a plurality of infrared rays with which the screen device is irradiated, and the rotation axis control means controls the rotating shaft based on the difference in a irradiation amount of the infrared rays with respect to the screen device. 5. The projection apparatus according to claim 4, wherein the irradiation position of infrared rays with which the screen device is irradiated is adjusted in the vertical direction of the screen device. 10. When the difference in the irradiation amount of a plurality of infrared rays detected from the screen device decreases to a certain amount, the step of irradiating the infrared ray and the infrared irradiating means are controlled to irradiate the screen device. 9. The projection angle correction method according to claim 8, further comprising: stopping the step of adjusting the irradiation position of infrared rays in the vertical direction of the screen device. 11. A screen device for projecting an image, comprising a means for detecting infrared rays, a tripod for leaning a screen, and a rotating shaft means for rotating an axis of the tripod, and a projection device for projecting the image on the screen device. The projection device comprises an infrared irradiating unit for irradiating the screen device with infrared rays at a plurality of different positions, an infrared irradiating control unit for controlling irradiation of the infrared ray by the infrared irradiating unit, and irradiating the screen device. Detecting means for detecting the arrival time difference of a plurality of infrared rays, and rotating the rotating shaft means based on the arrival time difference of the plurality of infrared rays with respect to the screen device to adjust the horizontal irradiation angle of the infrared rays emitted to the screen device. A projection angle correction system comprising: a rotation axis control means. 12. An infrared irradiation unit irradiates a plurality of different positions of a screen device with infrared rays to detect a difference in arrival times of the plurality of infrared rays detected by the screen device, and the screen is based on the difference in arrival times of the plurality of infrared rays. A projection angle correction method comprising: each step of rotating an axis of a tripod of the apparatus in a left-right direction to adjust an irradiation angle of an infrared ray applied to the screen apparatus in a left-right direction. 13. The projection angle correction system according to claim 11, wherein the screen device includes a screen for projecting an image, a tripod for leaning the screen, a rotating shaft means for rotating an axis of the tripod, and the projection. A screen device comprising: a detection unit that detects infrared rays emitted from the device. 14. An infrared irradiating unit for irradiating infrared rays to a plurality of different positions of the screen unit with respect to a screen unit for detecting infrared rays, and an infrared irradiating control unit for controlling irradiation of infrared rays to the infrared irradiating unit, Detecting means for detecting the arrival time difference of a plurality of infrared rays applied to the screen device, and rotating the rotating shaft means for rotating the axis of the tripod of the screen device in the left-right direction based on the arrival time difference of the plurality of infrared rays with respect to the screen device. A projection apparatus comprising: a rotation axis control unit that adjusts a horizontal irradiation angle of infrared rays with which the screen device is irradiated. 15. An infrared ray irradiating the screen device by controlling the step of irradiating the infrared ray and the infrared ray irradiating means when the arrival time difference of a plurality of infrared rays detected from the screen device decreases to a certain amount. 13. The projection angle correction method according to claim 12, further comprising a step of stopping the step of adjusting the irradiation angle in the left-right direction. 16. The screen device is adapted to control the position of the infrared irradiating means in the left-right direction based on the detected arrival time differences of the plurality of infrared rays so that the left-right irradiation position of the infrared light radiated to the screen device is adjusted. 13. A step of individually adjusting in the left-right direction of the
The projection angle correction method described. 17. The detecting means detects a plurality of infrared ray irradiation amount differences applied to the screen device, and the rotary axis control means controls the rotary shaft means based on the plurality of infrared ray irradiation amount differences to the screen device. The projection angle correction system according to claim 11, wherein the projection angle correction system controls and adjusts an irradiation angle of the infrared light with which the screen device is irradiated in the left-right direction. 18. An infrared ray irradiating means irradiates a plurality of different positions of a screen device with each other to detect a plurality of infrared ray irradiation amount differences detected by the screen device, and based on the plurality of infrared ray irradiation amount differences. A projection angle correction method comprising: each step of rotating an axis of a tripod of the screen device in a left-right direction to adjust an irradiation angle of an infrared ray applied to the screen device in a left-right direction. 19. When the difference in the irradiation amount of a plurality of infrared rays detected from the screen device decreases to a certain amount, the step of irradiating the infrared ray and the infrared irradiating means are controlled to irradiate the screen device. 13. The projection angle correction method according to claim 12, further comprising the step of stopping the step of adjusting the irradiation angle of infrared rays in the left-right direction.