JP2020144244A - Image projection device - Google Patents

Abstract

To provide an image projection device capable of easily selecting an area to shift the focus position in the image plane when adjusting the curvature of the image field.SOLUTION: An image projection device 100 projects images onto a projection surface via projection optics 200a. The image projection device 100 includes: area display means 111, 112 for displaying multiple areas which are capable of shifting the focal position on the projection surface; and control means 104 that controls the projection optics to shift the focal position of the selected area of the multiple areas to bend the image plane.SELECTED DRAWING: Figure 1

Description

The present invention relates to an image projection device (hereinafter referred to as a projector) capable of bending an image plane.

Some projectors have a function of bending an image plane so that the entire projected image can be focused on a curved screen. Patent Document 1 discloses a projector capable of adjusting curvature of field by changing the distance between lens groups of a projection optical system. Patent Document 2 discloses a projector capable of reducing the fluctuation of the angle of view due to the adjustment of the curvature of field of the projection optical system.

Japanese Unexamined Patent Publication No. 2011-145580 Japanese Unexamined Patent Publication No. 2017-049422

However, in the projectors disclosed in Patent Documents 1 and 2, it is not possible to select a region of the image plane where the focus position is moved when adjusting the curvature of field. Therefore, when the curvature of field is adjusted, it is often necessary to adjust the focus subsequently.

The present invention provides a projector capable of easily selecting a region of the image plane to move the focus position in the curvature of field adjustment.

An image projection device as one aspect of the present invention projects an image onto a projected surface through a projection optical system. The image projection device has an area display means for displaying a plurality of areas in which the focus position on the projected surface can be moved, and the image plane is curved by moving the focus position of a selected area among the plurality of areas. It is characterized by having a control means for controlling the projection optical system.

The control method as another aspect of the present invention is applied to an image projection device that projects an image onto a surface to be projected through a projection optical system. The control method includes a step of causing the image projection device to display a plurality of areas in which the focus position on the projected surface can be moved, and a step of moving the focus position of a selected area among the plurality of areas to move the image plane. It is characterized by having a step of controlling the projection optical system so as to be curved.

A computer program that causes the computer of the image projection device to execute a process according to the above control method also constitutes another aspect of the present invention.

According to the present invention, the region for moving the focus position can be easily selected, and the curvature of field can be easily adjusted.

The block diagram which shows the structure of the projector which is Example 1 of this invention. The figure which shows the focus adjustment and the image plane in Example 1. FIG. The figure which shows the curvature of field curvature adjustment in Example 1. FIG. Another figure which shows the curvature of field curvature adjustment in Example 1. FIG. The figure which shows the adjustment guide image in Example 1. FIG. Another figure which shows the adjustment guide image in Example 1. FIG. Yet another diagram showing an adjustment guide image in Example 1. Another figure which shows the adjustment guide image in Example 1. FIG. The flowchart which shows the process in Example 1. The block diagram which shows the structure of the projector which is Example 2 of this invention. The figure which shows the lens shift adjustment and curvature of field in Example 2. FIG. The figure which shows the adjustment guide image in Example 2. FIG. The figure which shows the zoom adjustment and curvature of field in Example 2. FIG. Another figure which shows the adjustment guide image in Example 2. FIG. Yet another diagram showing an adjustment guide image in Example 2. The flowchart which shows the process in Example 2. The block diagram which shows the structure of the projector which is Example 3 of this invention. The flowchart which shows the process in Example 3. The figure which shows the adjustment guide image in the projector which is Example 4 of this invention.

Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a projector (image projection device) 100 according to a first embodiment of the present invention. The light source unit 101 is composed of various lamps such as a high-pressure mercury lamp and a metal halide lamp, an LED, a laser diode, and the like, and emits illumination light.

The light modulation unit 102 is composed of a light modulation element such as a liquid crystal panel or a digital micromirror device (DMD). The optical modulation unit 102 is driven in response to a modulation drive signal from the modulation drive unit 110, which will be described later, to form an original image on the modulation surface, and modulates the illumination light according to the original image.

The operation input unit 103 receives an input of an operation signal according to a user operation. The operation signal is generated by a user operation on an operation unit such as a button or a switch provided in the projector 100, a remote controller device, a mobile terminal device having a communication function, or the like. The operation input unit 103 that has received the input of the operation signal transmits the operation information to the control unit 104.

The control unit 104 as a control means is composed of a program-controllable processor including a CPU, RAM / ROM, and the like. The modulation drive unit 110, the curvature of field adjustment unit 106, and the focus adjustment unit 105 are controlled based on the operation information received from the operation unit 103.

The modulation drive unit 110 includes an OSD unit 111 and a video processing unit 112. The video processing unit 112 performs various corrections such as signal decoding, interlaced progressive conversion, frame rate conversion, resolution conversion, aspect conversion, color correction, and shape conversion on the video signal input from the outside, and the video for modulation. A signal is generated, converted into a modulation drive signal, and output to the optical modulation unit 102. The OSD unit 111 generates an OSD image signal for displaying an OSD image such as a menu, a pointer, and a chart. The video processing unit 112 generates a modulation video signal obtained by synthesizing an OSD image signal with a video signal, converts this into a modulation drive signal, and outputs the modulation drive signal to the optical modulation unit 102. The optical modulation unit 102 is driven in response to the modulation drive signal from the modulation drive unit 110 to form an original image, and modulates the illumination light according to the original image to respond to the video signal (and OSD image signal). Generates image light for projecting an image.

The projection lens unit 200 has a projection optical system 200a that forms a projected image by magnifying and projecting image light (projected light) onto a projected surface 300 such as a screen. The projection optical system 200a is composed of optical elements (hereinafter, referred to as lenses) such as a plurality of lens elements arranged in the optical axis direction in which the optical axis extends. The projection lens unit 200 includes a focus adjustment unit 105 that drives a focus lens for adjusting an image plane position (focus position on the projected plane), which is a position of the entire image plane of the projection optical system 200a in the optical axis direction. It has an image plane curvature adjusting unit 106 that drives a curvature adjusting lens for adjusting the curvature of the image surface. The image plane is a plane in which the projected image, which is an image projected from the projection optical system onto the projection plane, is in focus. In the following description, the adjustment of the image plane position is referred to as focus adjustment, and the adjustment of curvature of field is referred to as curvature of field adjustment. The projection lens unit 200 may be integrally provided with the projector 100, or may be mounted interchangeably.

Focus adjustment will be described with reference to FIGS. 2 (a) to 2 (c). 2 (a) to 2 (c) show a focus lens (focus optical system) 105a driven by the optical modulation unit 102 shown in FIG. 1, a focus adjustment unit 105, and an image plane curvature adjustment unit 106. The curvature adjustment lens (curvature field optical system) 106a and the image plane 400 are shown. 500 is the position of the modulation surface in the optical modulation unit 102, 501 is the reference position of the curvature adjusting lens 106a, 502 is the reference position of the focus lens 105a, and 503 is the reference position of the projected surface 300 (hereinafter referred to as the screen reference position). ) Are shown respectively.

Further, 600 is a focal length on the optical axis of the projection optical system 200a (center of the projected image in the figure), and 601 and 602 are focal lengths at peripheral positions away from the optical axis, respectively. Of the projected image (image plane), the region close to the intersection of the optical axes of the projection optical system 200a is called the central region as the first region, and the region outside the central region is called the central region. It is called a peripheral area as a second area.

FIG. 2A shows a state in which the position of the image plane 400 as a plane is aligned with the screen reference position 503 and the projected image is in focus. As shown in FIGS. 2 (b) and 2 (c), the position of the image plane 400 is moved by the focus lens 105a moving back and forth from the reference position 502 in the optical axis direction with respect to the state of FIG. 2 (a). It moves back and forth with respect to the screen reference position 503. As a result, the focus is adjusted.

The curvature of field adjustment will be described with reference to FIGS. 3 (a) and 3 (b) and FIGS. 4 (a) and 4 (b). As shown in FIGS. 3A and 3B, when the curvature adjustment lens 106a moves back and forth from the reference position 501, the focal lengths 601 and 602 of the projection optical system 200a with respect to the peripheral region of the image plane 400 do not fluctuate. The focal length 600 with respect to the central region changes. That is, the focus position of the central region moves back and forth while the focus position of the peripheral region of the image plane 400 is fixed. As a result, the image plane 400 is curved. Moving the focus position of the central region of the image plane 400 to bend the field 400 in this way is called the first curvature of field adjustment.

Further, as shown in FIGS. 4A and 4B, the focus lens 105a and the curvature adjustment lens 106a both move back and forth from their reference positions 501 and 502, so that the focal length 600 with respect to the central region of the image plane 400 The focal lengths 601 and 602 with respect to the peripheral region change without changing. That is, the focus position of the peripheral region moves back and forth while the focus position of the central region of the image plane 400 is fixed. As a result, the image plane 400 is curved. Moving the focus position of the peripheral region of the image plane 400 in this way to bend the image plane 400 is called the second curvature of field adjustment.

Next, an OSD image (hereinafter referred to as an adjustment guide image) that serves as a guide for the user to select a region of the image plane 400 in which the focus position is to be moved back and forth by adjusting the curvature of field (hereinafter referred to as a focus position moving region). ) Is projected and displayed. The guide display process will be described.

This guide display process is performed by the area display means composed of the OSD unit 111 and the video processing unit 112. Specifically, the control unit 104, which receives the focus position adjustment instruction as the operation information from the operation input unit 103, causes the OSD unit 111 to create an adjustment guide image signal as the OSD image signal. The video processing unit 112 converts the modulation video signal obtained by combining the adjustment guide image signal and the video signal into a modulation drive signal and outputs the modulation drive signal to the optical modulation unit 102. By driving the optical modulation unit 102 in response to this modulation drive signal, the adjustment guide image is projected and displayed on the projected surface 300.

FIG. 5 shows an example of the adjustment guide image 310. The adjustment guide image 310 includes a first guide part 311 showing a central region that can be selected as a focus position moving region, and a second guide part 312 showing peripheral regions (regions near the four corners).

The user refers to the displayed adjustment guide image and selects the central area or the peripheral area as the focus position moving area through the operation input unit 103. The control unit 104 adjusts the curvature of field of the first image plane shown in FIGS. 3 (a) and 3 (b) according to the information of the focus position moving area received as the operation information from the operation input unit 103, and FIG. 4 (a). , (B) Performs one of the second curvature-of-field curvature adjustments. The information in the focus position moving area also includes information on the moving direction (near or far side of the projector 100) of the focus position selected (instructed) by the user, and the control unit 104 focuses in the moving direction. Move the position.

6 (a) to 6 (c) show an example of the adjustment guide image 310. In FIGS. 6A to 6C, the adjustment guide image 310 is composited (superimposed) on a part of the projected image 301. When the central area is selected by the user as the focus position moving area, the first guide part 311 is highlighted as shown in FIG. 6A, and when the peripheral area is selected, it is shown in FIG. 6B. The second guide part 312 is highlighted as shown. Further, when both the central region and the peripheral region are selected as the focus position moving region, that is, when the focus adjustment shown in FIG. 2 is selected, the first and first are as shown in FIG. 6 (c). 2 Guide parts 311, 312 are highlighted. In this way, the selected focus position moving area can be displayed visually in an easy-to-understand manner to the user.

Further, as shown in FIGS. 7 (a) to 7 (c), the first and second guide parts 311, 312 of the adjustment guide image 310 can be combined and displayed on the entire projected image 301. In this case as well, when the central region is selected as the focus position movement region, when the peripheral region is selected, and when both of them are selected, FIGS. 7 (a), 7 (b) and 7 respectively. As shown in (c), one or both of the first and second guide parts 311, 312 are highlighted. Even in this case, the selected focus position moving area can be displayed visually in an easy-to-understand manner to the user.

Further, as shown in FIG. 8, an adjustment guide image 310 may be displayed in which the selectable focus position moving area is represented by characters. FIG. 8 shows how the peripheral region is selected as the focus position moving region.

The focus position movement process performed by the control unit 104 in this embodiment will be described with reference to the flowchart of FIG. This focus position moving process also includes the guide display process described above. The control unit 104 as a computer executes this process according to a computer program. In the following description, "S" means a step.

In S101, the control unit 104 causes the OSD unit 111 to create an adjustment guide image signal in response to the focus position adjustment instruction output from the operation input unit 103 in response to the user operation, and further causes the video processing unit 112 to create the adjustment guide image signal. The modulation drive signal including the above is output to the optical modulation unit 102. As a result, the adjustment guide image is projected and displayed.

Next, in S102, the control unit 104 acquires information on the focus position moving area selected by the user from the operation input unit 103. As described above, the information of the focus position moving area also includes the information of the moving direction of the focus position (hereinafter, referred to as the focus moving instruction direction) instructed by the user.

Then, in S103, the control unit 104 determines whether or not the selected focus position moving region is only the central region, and if it is only the central region, proceeds to S104, and if not, proceeds to S105.

In S104, the control unit 104 causes the field curvature adjustment unit 106 to drive the curvature adjustment lens 106a in the focus movement designated direction. As a result, the first curvature of field adjustment shown in FIG. 3A or FIG. 3B is performed.

On the other hand, in S105, the control unit 104 determines whether or not the selected focus position moving region is only the peripheral region, and if it is only the peripheral region, proceeds to S106, and if not, proceeds to S107.

In S106, the control unit 104 drives the focus adjustment unit 105 and the curvature of field adjustment unit 106 to drive the focus lens 105a and the curvature adjustment lens 106a in the focus movement designated direction, respectively. As a result, the second curvature of field adjustment shown in FIG. 4A or FIG. 4B is performed.

In S107, the control unit 104 determines whether or not the selected focus position moving region is both the central region and the peripheral region, and if both, the process proceeds to S108, and if not, the present process ends.

In S108, the control unit 104 causes the focus adjustment unit 105 to drive the focus lens 105a in the focus movement designated direction. As a result, the focus adjustment shown in FIG. 2 (b) or FIG. 2 (c) is performed.

As described above, according to the present embodiment, it is possible to display an adjustment guide image that serves as a guide when the user selects a focus position moving area in the image plane. Therefore, the user can easily perform the curvature of field adjustment and the focus adjustment.

When returning the curved image plane to a flat surface by adjusting the curvature of field of the first or second image plane, the user is made to select the central region or the peripheral region as the focus position moving region, and the control unit 104 is set according to the result. The curvature of field adjustment unit 106 or this and the focus adjustment unit 105 are controlled.
In other words, depending on the user's choice of returning the focus position of the central region to the position before the movement and returning the image plane to the plane, or returning the focus position of the peripheral region to the position before the movement and returning the image plane to the plane. The projection optical system 200a is controlled. As a result, the curved image plane can be easily returned to a flat surface according to the user's selection.

FIG. 10 shows the configuration of the projector 100', which is the second embodiment of the present invention. In this embodiment, the components common to those in the first embodiment are designated by the same reference numerals as those in the first embodiment. The projector 100'of this embodiment is different from the projector 100 of the first embodiment in that it has a lens shift adjusting unit 107. Further, the projection lens unit 200'in the present embodiment is different from the projection lens unit 200 of the first embodiment in that it has a zoom adjusting unit 108.

The lens shift adjustment unit 107 includes a shift mechanism that shifts the projection lens unit 200'in the direction orthogonal to the optical axis (horizontal direction and vertical direction) electrically or manually by the user, and the projection lens unit 200'in each shift direction. It has a sensor that acquires a position (hereinafter referred to as a shift position). Further, the zoom adjustment unit 108 includes a zoom drive mechanism that changes the projection angle of view by moving the zoom lens (zoom optical system) of the projection optical system 200a'electrically or manually in the optical axis direction, and the position of the zoom lens. It has a sensor that acquires (hereinafter referred to as a zoom position).

11 (a) to 11 (d) show the projector 100', the projection lens unit 200', the image plane (projected image) 400, and the screen reference position 503 as viewed from the side. Reference numeral 610 is the optical axis of the projection optical system 200a', and 620 indicates the projection light.

11 (a) and 11 (b) show a case where the center of the image plane 400 is located on the optical axis 610, that is, a state in which the projection lens unit 200'is not shifted. When the second curvature of field curvature adjustment described in the first embodiment in FIG. 11A is performed, the focus position of the central region of the image plane 400 does not move from the screen reference position 503, and the focus position of the peripheral region is closer. Or move to the far side. Further, when the first curvature of field curvature adjustment described in the first embodiment in FIG. 11B is performed, the focus position of the peripheral region of the image plane 400 does not move from the screen reference position 503, and the focus position of the central region is close. Move to the side or far side. In these cases, the amount of movement of the focus position from the screen reference position 503 increases concentrically as the distance from the position on the optical axis 610 increases.

On the other hand, in FIGS. 11 (c) and 11 (d), the projection lens unit 200'is shifted only in the vertical direction so that the lower side of the image plane 400 is located on the optical axis 610 (this shift position is vertically 50%). Indicates the state (called the shift position). When the second and first curvatures of field are adjusted in this state, the amount of movement of the focus position differs between the upper side region and the lower side region of the image plane 400. By changing the positional relationship between the image plane 400 and the optical axis 600 in this way, the region where the focus position moves and the amount of movement thereof change due to the curvature of field adjustment.

Therefore, in this embodiment, the control unit 104 acquires the current shift position of the projection lens unit 200'from the lens shift adjustment unit 107 and notifies the OSD unit 111 of the modulation drive unit 110. Then, the OSD unit 111 is made to calculate the positions of the first and second guide parts according to the shift position, and generate an adjustment guide image signal capable of displaying these guide parts. As a result, the adjustment guide image including the first and second guide parts according to the shift position is projected and displayed.

12 (a) to 12 (c) show the adjustment guide image 310'when the current shift position is the above-mentioned vertical 50% shift position (shift position where the shift amount is 0% in the horizontal direction). The adjustment guide image 310'has a first guide part 311'showing a first region including a position on the optical axis 600 on the projected image 301 (image plane 400) near the lower side thereof, and a first guide part 311' on the upper side. Includes a second guide part 312'showing a second region outside the region.

FIG. 12A shows a state in which the first guide part 311'is highlighted when the first region is selected as the focus position moving region. FIG. 12B shows a state in which the second guide part 312'is highlighted when the second area is selected as the focus position moving area. FIG. 12C shows a state in which the first and second guide parts 311 ′ and 312 ′ are highlighted when both the first and second regions are selected as the focus position movement region. Shown. In this way, even when the projection lens unit 200'is shifted, the selected focus position moving area can be visually displayed to the user in an easy-to-understand manner.

The OSD unit 111 may adjust the expansion and contraction of the first and second guide parts according to the shift position of the projection lens unit 200'. Further, the first and second guide parts for each shift position may be prepared (stored) in advance, and the first and second guide parts according to the actual shift position may be selected and used.

13 (a) and 13 (b) also show the projector 100', the projection lens unit 200', the image plane (projected image) 400, and the screen reference position 503 as viewed from the side. As can be seen from these figures, when the projection optical system 200a'is zoomed, the width of the projection light 620, that is, the projection angle of view changes. Then, the region where the focus position moves and the amount of movement thereof change by adjusting the curvature of field according to the projected angle of view. Specifically, when the projection angle of view is small as shown in FIG. 13, the peripheral region where the focus position can be moved becomes smaller than when the projection angle of view is large as shown in FIG. 13A. The amount of movement is also small.

The control unit 104 determines the projection distance (distance from the projection optical system 200a'to the screen reference position 503) from the position of the focus lens (focus position) acquired from the focus adjustment unit 105 and the zoom position acquired from the zoom adjustment unit 108. Ask. Then, the projection angle of view is calculated from the relationship between the magnification (projection ratio) and the projection distance for each zoom position of the projection optical system 200a'held in advance. The control unit 104 notifies the modulation drive unit 110 of the calculated projection angle of view, so that the OSD unit 111 calculates the positions of the first and second guide parts according to the notified projection angle of view. Generates an adjustment guide image signal that can be displayed. As a result, the adjustment guide image including the first and second guide parts according to the zoom position is projected and displayed.

FIG. 14 shows an adjustment guide image when the projection angle of view is reduced from the projection angle of view shown in FIG. 13 (a) to the projection angle of view shown in FIG. 13 (b) when the projection lens unit 200'is not shifted. Shown. The size of the projected image 302 after zooming is smaller than the size of the projected image 301 before zooming. At this time, as the peripheral area where the focus position can be moved becomes smaller, the second guide part 312'in the adjustment guide image is also made smaller than the size before zooming. As a result, the focus position moving area that changes according to the projected angle of view (zoom position) can be displayed in an easy-to-understand manner.

The OSD unit 111 may adjust the expansion and contraction of the first and second guide parts according to the zoom position of the projection lens unit 200'. Further, the first and second guide parts for each zoom position may be prepared (stored) in advance, and the first and second guide parts according to the actual zoom position may be selected and used.

Next, a case where the optical modulation unit 102 forms an original image on a part of the modulation surface will be described with reference to FIG. For example, the case where the aspect ratio of the modulation surface of the optical modulation unit 102 is 16:10 and the aspect ratio (input aspect) of the input video signal is 4: 3 will be described. In this case, as shown in FIG. 15, the video processing unit 112 has a projection aspect of 16:10 including a video area 320 having a 4: 3 aspect ratio corresponding to the input aspect and black areas 321 arranged at both left and right ends thereof. A modulation drive signal for projecting the projected image 301 is generated. The control unit 104 causes the OSD unit 111 to calculate the positions of the first and second guide parts 311'and 312' corresponding to the input aspect and the projection aspect, and generate an adjustment guide image signal capable of displaying these. As a result, the adjustment guide image can be displayed in the image area 320 excluding the black area 321 of the projected image 301, and the focus position moving area can be displayed in an easy-to-understand manner.

The OSD unit 111 may adjust the expansion and contraction of the first and second guide parts according to the input aspect and the projection aspect. It is also possible to prepare (memorize) the first and second guide parts for each combination of the input aspect and the projection aspect in advance, and select and use the first and second guide parts according to the actual combination. Good.

Further, although not shown, information on the resolution and aspect of the input video signal is acquired from the AVI Infoframe or the like of the input video signal detected in the modulation drive unit 110, and the OSD unit 111 displays the guide parts corresponding to the information. A possible adjustment guide image signal may be generated.

Further, when the video processing unit 112 has a function of correcting the video signal (for example, trapezoidal correction processing) in order to reduce the distortion of the projected image as a distortion correction means, the OSD unit 111 corrects the distortion. An adjustment guide image signal capable of displaying guide parts according to the amount may be generated.

In this case as well, the OSD unit 111 may adjust the expansion and contraction of the first and second guide parts according to the amount of distortion correction. Further, the first and second guide parts for each distortion correction amount may be prepared (stored) in advance, and the first and second guide parts according to the actual combination may be selected and used.

The focus position movement process performed by the control unit 104 in this embodiment will be described with reference to the flowchart of FIG. In S201, the control unit 104 outputs the shift position, zoom position, input aspect, and projection of the projection lens unit 200'to the OSD unit 111 in response to the focus position adjustment instruction output from the operation input unit 103 in response to the user operation. Get information on aspect and distortion correction amount. Then, the OSD unit 111 is made to calculate the positions of the first and second guide parts 311'and 312'using these information.

Next, in S202, the control unit 104 causes the OSD unit 111 to create an adjustment guide image signal for displaying the first and second guide parts 311'and 312' whose positions have been calculated, and further, the video processing unit 112. The optical modulation unit 102 outputs a modulation drive signal including the adjustment guide image signal. As a result, the adjustment guide image is projected and displayed.

The following S203 to S209 are the same as S102 to S108 described with reference to FIG. 9 of the first embodiment, respectively.

As described above, according to the present embodiment, it is possible to display the adjustment guide image according to the shift position, the zoom position, the input aspect, the projection aspect, and the distortion correction amount. Therefore, the user can easily perform curvature of field and focus adjustment.

FIG. 17 shows the configuration of the projector 100 ″ which is the third embodiment of the present invention. In the present embodiment, the components common to the second embodiment are designated by the same reference numerals as those of the second embodiment. The projector 100 ″ is the same as the projector 100 ′ of the second embodiment in terms of components, but is different from the projector 100 ′ of the second embodiment in that the projection lens unit 200 ″ is interchangeably mounted. The projection lens unit 200 ″ in the embodiment is different from the projection lens unit 200 ′ in the second embodiment in that it has a lens recording unit 109 as a storage means.

The lens recording unit 109 records lens information such as the model and identification information of the projection lens unit 200 "or information on the amount of curvature of field obtained by the projection optical system 200a'. The control unit 104 records the projection lens unit 200. The lens information or the curvature of field information of "" is acquired from the lens recording unit 109 and notified to the modulation driving unit 110.

The OSD unit 111 in the modulation drive unit 110 stores in advance a plurality of projection lens units or first and second guide parts corresponding to the amount of curvature of field. The OSD unit 111 corresponds to the lens information or the curvature of field information (that is, the currently mounted projection lens unit 200 ″) received from the control unit 104 from among the first and second guide parts. The first and second guide parts are selected, and the adjustment guide image signal for displaying the first and second guide parts is generated. The video processing unit 112 generates a modulation including the adjustment guide image signal. A drive signal is generated, whereby an adjustment guide image including the first and second guide parts for the projection lens unit 200 ″ is projected and displayed. That is, when a plurality of projection lens units having different curvatures of field can be mounted on the projector 100 ", it is possible to display an adjustment guide image including guide parts corresponding to the currently mounted projection lens units. ..

The focus position movement process performed by the control unit 104 in this embodiment will be described with reference to the flowchart of FIG. In S301, the control unit 104 transmits the lens information or the curvature of field amount information acquired from the lens recording unit 109 to the OSD unit 111 in response to the focus position adjustment instruction output from the operation input unit 103 in response to the user operation. Notice. Then, the OSD unit 111 is made to select the first and second guide parts corresponding to the lens information or the curvature of field information notified.

Next, in S302, the control unit 104 sends the OSD unit 111 the shift position, zoom position, and input aspect of the projection lens unit 200 ″ in response to the focus position adjustment instruction output from the operation input unit 103 in response to the user operation. , The information on the projection aspect and the amount of distortion correction is acquired, and the OSD unit 111 is made to calculate the positions of the first and second guide parts using the information.

Next, in S303, the control unit 104 causes the OSD unit 111 to create an adjustment guide image signal for displaying the first and second guide parts whose positions have been calculated, and causes the video processing unit 112 to generate the adjustment guide image signal. The including modulation drive signal is output to the optical modulation unit 102. As a result, the adjustment guide image is projected and displayed.

The following S304 to S310 are the same as S102 to S108 described with reference to FIG. 9 of the first embodiment, respectively.

As described above, according to the present embodiment, it is possible to display the adjustment guide image corresponding to the currently mounted projection lens unit among the plurality of projection lens units. Therefore, the user can easily perform curvature of field and focus adjustment.

FIG. 19 shows an adjustment guide image 310 ″ projected and displayed by a projector according to a fourth embodiment of the present invention. The adjustment guide image 310 ″ is a modification of the adjustment guide image 310 shown in the first embodiment. ..

The adjustment guide image 310 ″ includes a first guide part 311 ″ as a rectangular frame indicating a central area that can be selected as a focus position movement area, and four second guide parts 312 ″ as a rectangular frame indicating a peripheral area. including.
Also in this embodiment, it is possible to display an adjustment guide image that serves as a guide when the user selects a focus position moving area in the image plane. Therefore, the user can easily perform the curvature of field adjustment and the focus adjustment.
(Other Examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

Each of the above-described examples is only a representative example, and various modifications and changes can be made to each of the examples in carrying out the present invention.

100, 100', 100 "Projector 104 Control unit 105 Focus adjustment unit 106 Image curvature adjustment unit 110 Modulation drive unit 200, 200', 200" Projection lens unit 310 Adjustment guide image

Claims (13)

An image projection device that projects an image onto the projected surface through a projection optical system.
Area display means for displaying a plurality of areas capable of moving the focus position on the projected surface, and
An image projection apparatus comprising: a control means for controlling the projection optical system so as to move the focus position of a selected region among the plurality of regions to bend an image plane. The image projection apparatus according to claim 1, wherein the plurality of regions include at least a first region of the image plane and a second region outside the first region. The control means is characterized in that when the projection optical system is controlled so as to return the curved image plane to a plane, the focus position of a selected region among the plurality of regions is returned to the position before movement. The image projection apparatus according to claim 1 or 2. The control means is characterized in that when the projection optical system is controlled so as to return the curved image plane to a plane, the focus position of a region different from the selected region among the plurality of regions is moved. The image projection apparatus according to claim 1 or 2. When all of the plurality of regions are selected, the control means moves the focus position of the plurality of regions in the direction of the optical axis so as to move the image plane in a plane. The image projection apparatus according to any one of claims 1 to 4, wherein the image projection apparatus is controlled. It has a shift mechanism that shifts the projection optical system in a direction orthogonal to the optical axis direction.
The image projection device according to any one of claims 1 to 5, wherein the region display means changes the display of the plurality of regions according to a shift position of the projection optical system. The projection optical system can be zoomed to change the projection angle of view.
The image projection device according to any one of claims 1 to 5, wherein the area display means changes the display of the plurality of areas according to the projection angle of view. The image projection device projects the image according to the input video signal.
The image projection device according to any one of claims 1 to 5, wherein the area display means changes the display of the plurality of areas according to an input aspect of the video signal. The image projection device according to any one of claims 1 to 5, wherein the area display means changes the display of the plurality of areas according to the projection aspect of the image. The image projection device has a distortion correction means for correcting distortion of the image.
The image projection device according to any one of claims 1 to 5, wherein the area display means changes the display of the plurality of areas according to the correction of the distortion. In the image projection device, the projection optical system can be replaced.
The image projection device according to any one of claims 1 to 5, wherein the area display means changes the display of the plurality of areas according to a projection optical system mounted on the image projection device. .. It is a control method of an image projection device that projects an image onto a surface to be projected through a projection optical system.
To the image projection device
A step of displaying a plurality of areas where the focus position on the projected surface can be moved, and
A control method for an image projection apparatus, which comprises a step of controlling the projection optical system so as to move the focus position of a selected region among the plurality of regions to bend an image plane. A computer program comprising causing a computer of an image projection apparatus that projects an image through a projection optical system to execute a process according to the control method according to claim 12.