JP2009229939A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of preventing worsening of balance between sound volume and tone quality of right and left speakers. <P>SOLUTION: Since a user observes projected image at the center of the front of the projected image usually, positional relationship in the right and left directions between an installation position of the projector and a projected image forming position is positional relationship in the right and left directions between the installation position of the projector and user's observation position. Parameter acquiring means 51, 52, 53, 621 acquire positional relationship parameters indicating the positional relationship in the right and left directions between the installation position of the projector and the projected image forming position. Since a correcting means 631 corrects sound signals based on the positional relationship parameters indicating the positional relationship in the right and left directions between the installation position of the projector and user's observation position, at least either of balance of sound volume and balance of tone quality of each speaker 31, 32 installed in positions being different in distance in the right and left directions from the user can be adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector.

  Conventionally, a light source device (illumination optical system), a light modulation device (liquid crystal light valve) that modulates a light beam emitted from the light source device (illumination optical system) according to image information to form image light, and image light A projector including a projection optical device (projection optical system) that performs enlarged projection on a screen or a wall surface and a stereo speaker is known (see, for example, Patent Document 1). In the projector described in Patent Document 1, the stereo speaker is provided on the left side of the housing (left channel speaker) provided on the left side of the housing when viewed from the rear of the projector and on the right side of the housing when viewed from the rear of the projector. Right speaker (right channel speaker). The left and right speakers can output two-channel realistic sound.

JP 2005-77912 A

  By the way, in the projector, the user generally appreciates the image at the front center of the projection image. Therefore, in the projector described in Patent Document 1, when the image light is projected onto the area in front of the projector on the projection surface, the installation position of the projector and the viewing position of the user are both in the image light projection direction. Since the user's viewing position is located at a position where the distance from the left and right speakers of the projector is equal, the projector must output sound with a balanced sound volume and sound quality to the user. Can do.

  However, the projector is installed at a position shifted in the left-right direction with respect to the region to be projected on the projection surface. For example, the position of the projection image is positioned on the region to be projected on the projection surface by moving the projection lens to the left and right. There is a case. In this case, the viewing position of the user viewing the image in front of the projected image is located on either the left or right side of the projector installation position. However, in the projector disclosed in Patent Document 1, when the viewing position of the user is located on either the left or right side with respect to the installation position of the projector, the distance from the left and right speakers to the viewing position of the user is large. Therefore, there is a problem that the user cannot output a sound with a balanced sound volume and sound quality.

  The objective of this invention is providing the projector which can suppress the deterioration of the balance of the volume and sound quality of a speaker on either side.

The projector according to the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information to form image light, and enlarges and projects the image light on a projection surface. A projector including a projection optical device that forms a projection image on a projection surface and a plurality of speakers, an audio acquisition unit that acquires an audio signal, an installation position of the projector, and the projection on the projection surface A parameter acquisition unit that acquires a positional relationship parameter related to a positional relationship with an image forming position; a correction unit that corrects the acquired audio signal based on the positional relationship parameter acquired by the parameter acquisition unit; Output means for outputting the audio signal to the plurality of speakers.
Here, “the positional relationship between the installation position of the projector and the formation position of the projection image” specifically refers to the installation position of the projector and the position on the projection plane in a state of facing the projection plane from the rear side of the projector. Means the positional relationship in the left-right direction between the installation position of the projector and the formation position of the projection image. Hereinafter, the left-right direction means the left-right direction when the projection surface side is viewed from the rear side of the projector in a state of facing the projection surface.

The user usually appreciates the projected image at the front center of the projected image. Therefore, the positional relationship in the left-right direction between the installation position of the projector and the formation position of the projection image indicates the positional relationship in the left-right direction between the installation position of the projector and the viewing position of the user.
On the other hand, according to the present invention, the parameter acquisition unit acquires the positional relationship parameter indicating the positional relationship in the left-right direction between the installation position of the projector and the formation position of the projection image. Then, the correcting means is based on the positional relationship parameter indicating the positional relationship in the left-right direction between the installation position of the projector and the formation position of the projection image, that is, the positional relationship in the left-right direction between the installation position of the projector and the viewing position of the user. Therefore, at least one of volume balance and sound quality balance (including phase, delay amount, etc.) of each speaker having a different distance in the left-right direction from the user can be adjusted.

For example, when the positional relationship parameter indicates that the user's viewing position (projected image formation position) is on the left side of the projector installation position, the correction unit, on the left side of the plurality of speakers (user The audio signal can be corrected so that the volume of the speaker on the side closer to the viewing position is reduced and the volume of the speaker on the right side (side away from the viewing position of the user) is increased. In addition, when the positional relationship parameter indicates that the viewing position of the user (projection image formation position) is away from the projector in the left-right direction, the correction unit is arranged on the side closer to the user. The audio signal can be corrected so that the volume of the speaker is further reduced and the volume of the speaker on the side farther from the user is increased. Conversely, if the positional relationship parameter indicates that the viewing position of the user is close to the projector in the left-right direction, the audio signal can be corrected so as to reduce the difference in volume between the left and right. Therefore, it is possible to suppress the deterioration in the balance between the volume and sound quality of the left and right speakers caused by the positional relationship between the installation position of the projector and the viewing position of the user.
In addition, since the correcting means automatically corrects the audio signal based on the acquired positional relationship parameter, the user does not have to manually adjust the volume and sound of each speaker, and the convenience of the projector can be improved. .

  In the projector according to the aspect of the invention, the projector may include a projection position adjustment device that adjusts a left-right position of the projection image on the projection surface by moving the projection optical device in the left-right direction, and the parameter acquisition unit includes the projection position adjustment device. It is preferable that an optical device movement amount acquisition unit that acquires a movement amount in the left-right direction of the projection optical device as described above as the positional relationship parameter is provided.

  Here, there is a case where the projector is installed at a position shifted in the left-right direction with respect to a region where the image light is desired to be projected on the projection surface. In this case, the projection position adjusting device may move the projection image from the front of the projector to the region by moving the projection optical device in the left-right direction. In such a case, for example, when the projection position adjustment device moves the projection optical device to the left side and moves the projection image from the front side of the projector to the left side, the user who appreciates the projection image at the front center of the projection image The viewing position is located on the left side of the projector. Conversely, when the projection position adjusting device moves the projection optical device to the right side and moves the projection image to the right side of the projector, the viewing position of the user is located on the right side of the projector.

Further, as the projection position adjustment device moves the projection optical device to the left and right, the formation position of the projection image is further away from the projector in the left-right direction. In other words, the user's viewing position moves away from the projector in the left-right direction.
That is, the amount of movement of the projection optical device in the left-right direction by the projection position adjusting device is determined by whether the viewing position of the user is on the left or right side of the projector, Indicates the distance in the direction.
In contrast, according to the present invention, since the projector includes the optical device movement amount acquisition unit, the movement amount of the projection optical device that indicates the positional relationship between the installation position of the projector and the viewing position of the user in the left-right direction. As a result, the correcting means can correct the audio signal based on the movement amount of the projection optical apparatus, so that it is possible to reliably suppress the deterioration of the balance between the sound volume and the sound quality of the speaker.

  In the projector according to the aspect of the invention, an image acquisition unit that acquires image information relating to the image light to be projected, and a distortion correction unit that corrects the image information acquired by the image acquisition unit so that the projection image is not distorted. The parameter acquisition unit preferably includes a correction amount acquisition unit that acquires the correction amount of the image information by the distortion correction unit as the positional relationship parameter.

Here, there is a case where the projector is installed at a position shifted in the left-right direction with respect to a region where the image light is desired to be projected on the projection surface. In this case, the projection image may be positioned in the region by arranging the projector so as to be inclined with respect to the projection surface (arranged so that the image light emission direction of the projector is inclined with respect to the projection surface). .
In such a case, for example, when the projector is installed on the right side with respect to the area to be projected on the projection surface and is inclined toward the area, the projected image is formed on the left side of the projector. That is, the viewing position of the user is located on the left side of the projector. In this case, the width on the left side of the projected image is widened and the width on the right side is narrowed. Therefore, the distortion correction unit performs horizontal trapezoidal distortion correction that narrows the width on the left side of the image related to the image information and widens the right side. To the information.
On the contrary, when the projector is installed on the left side with respect to the area to be projected on the projection surface and is inclined toward the area, the projection image is formed on the right side of the projector. It will be located on the right side of the projector. In this case, since the right side width of the projected image is widened and the left side width is narrowed, the distortion correction unit performs horizontal trapezoidal distortion correction that narrows the right side width of the image related to the image information and widens the left side width. To the information.

In addition, as the projector is inclined with respect to the projection surface, the formation position of the projected image is further away from the projector in the left-right direction, and the viewing position of the user is further away from the projector in the left-right direction. It will be. And since the distortion amount which arises in a projection image also increases, the correction amount with respect to the image information of a distortion correction means also increases.
That is, the correction amount of the image information by the distortion correcting unit indicates whether the viewing position of the user is on the left or right side of the projector, and the distance in the left-right direction between the installation position of the projector and the viewing position of the user. .
On the other hand, according to the present invention, since the projector includes the correction amount acquisition unit, the correction of the image information by the distortion correction unit indicating the positional relationship between the installation position of the projector and the viewing position of the user in the left-right direction. Thus, the correction means can correct the audio signal based on the correction amount of the image information, so that it is possible to reliably suppress the deterioration of the balance between the sound volume and the sound quality of the speaker.

  In the projector according to the aspect of the invention, the projection optical device includes a zoom lens and a magnification adjustment unit that adjusts the magnification of the projection optical device by moving the zoom lens forward and backward along the incident direction of the image light incident on the zoom lens. The parameter acquisition unit preferably includes a zoom lens movement amount acquisition unit that acquires a movement amount of the zoom lens by the magnification adjustment unit as the positional relationship parameter.

When the projector forms a projection image on the projection surface, for example, on the left side of the projector, the viewing position of the user is located on the left side of the projector. In such a case, when the magnification adjusting means moves the zoom lens from a predetermined reference position to one side along the incident direction of the incident image light to increase the magnification of the projection optical device, the image of the projected image is displayed. As the outline is enlarged, the center of the projected image is further away from the projector to the left, and the user's viewing position is further away from the projector to the left. Conversely, when the magnification adjustment means moves the zoom lens from the predetermined reference position to the other side along the incident direction of the incident image light to reduce the magnification of the projection optical device, the reduction of the contour of the projection image Accordingly, the center of the projection image approaches the projector, so that the user's viewing position approaches the projector.
That is, the movement amount of the zoom lens indicates the distance in the left-right direction between the installation position of the projector and the viewing position of the user.
In contrast, according to the present invention, since the projector includes the zoom lens movement amount acquisition unit, the zoom lens movement amount indicating the distance in the left-right direction between the installation position of the projector and the viewing position of the user is acquired. This makes it possible for the correction means to correct the audio signal based on the amount of movement of the zoom lens, so that it is possible to reliably suppress the deterioration in the balance between the volume and sound quality of the speaker.

  In the projector according to the aspect of the invention, the projection optical device may adjust the focus position of the projection optical device by moving the focus lens and the focus lens back and forth along the incident direction of the image light incident on the focus lens. It is preferable that the parameter acquisition unit includes a focus lens movement amount acquisition unit that acquires a movement amount of the focus lens by the focus position adjustment unit as the positional relationship parameter.

When the projector forms a projection image on the left side of the projector on the projection surface, the viewing position of the user is located on the left side of the projector. In such a case, the focus position adjusting means moves the focus lens from the predetermined reference position to one side along the incident direction of the incident image light, and the focus position of the projection optical device is set to the front end side of the image light emission direction. Since the projected image is formed at a position away from the projector, the contour of the projected image is enlarged, and the center of the projected image is further away from the projector to the left. Is farther left from the projector. Conversely, the focus position adjustment means moves the focus lens from the predetermined reference position to the other side along the incident direction of the incident image light, and moves the focus position of the projection optical device to the proximal side in the image light emission direction. In this case, the projected image is formed at a position close to the projector, so that the outline of the projected image is reduced and the center of the projected image approaches the projector, so that the user's viewing position approaches the projector. Become.
That is, the movement amount of the focus lens indicates the distance in the left-right direction between the installation position of the projector and the viewing position of the user.
On the other hand, according to the present invention, since the projector includes the focus lens movement amount acquisition unit, the movement amount of the focus lens indicating the distance in the horizontal direction between the installation position of the projector and the viewing position of the user is acquired. This makes it possible for the correction means to correct the audio signal based on the amount of movement of the focus lens, so that it is possible to reliably suppress deterioration in the balance between the volume and sound quality of the speaker.

[Configuration of projector]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a projector 1 according to the present embodiment.
The projector 1 enlarges and projects image light onto the screen Sc (see FIG. 2) and outputs sound. In this embodiment, the screen Sc is used as a projection surface for projecting image light, but a wall surface may be used as the projection surface. As shown in FIG. 1, the projector 1 includes a rectangular parallelepiped outer casing 11 and a projector main body 12 that is housed in the outer casing 11 and a part thereof is exposed from the outer casing 11. Yes.

From the front surface 111 of the exterior casing 11, a projection optical device 43 that constitutes the projector main body 12 and enlarges and projects image light onto the screen Sc is exposed. The projection optical device 43 is provided with a zoom ring 4321 for adjusting the magnification and a focus ring 4331 for adjusting the focus position. The configurations of the projection optical device 43, the zoom ring 4321, and the focus ring 4331 will be described later. The top surface 112 of the exterior housing 11 is provided with a dial 441 which will be described later in detail for moving the projection optical device 43 and adjusting the position of the projected image on the screen Sc.
Further, the operation means 2 is provided on the top surface 112 of the exterior housing 11. The operation means 2 outputs an operation signal corresponding to the input operation by the user to the projector main body 12. By the operation of the operation means 2 by the user, the distortion correction of the projected image and the volume adjustment of the stereo speaker 3 (see FIG. 2) described later (volume adjustment of the speaker 3 as a whole, not volume adjustment of individual speakers) are performed. Done.

FIG. 2 is a block diagram showing the configuration of the projector body 12.
As shown in FIG. 2, the projector main body 12 includes a stereo speaker 3, an optical unit 4, lens parameter acquisition means 5, and a control device 6.
The stereo speaker 3 outputs sound under the control of the control device 6. The stereo speaker 3 includes a left speaker 31 provided on the left side of the projector 1 in the image light emission direction and a right speaker 32 provided on the right side of the projector 1 in the image light emission direction. Yes.

The optical unit 4 forms image light according to image information output from the control device 6 and enlarges and projects the image light. The optical unit 4 includes a light source device 41, a light modulation device 42, a projection optical device 43, and a projection position adjustment device 44. Although not shown in the drawing, the optical unit 4 is a color that separates the light emitted from the light source device 41 into light of each color of R (red), G (green), and B (blue) in addition to these configurations. A separation optical device; and a color synthesis optical device such as a cross dichroic prism that synthesizes each color light.
The light source device 41 includes a discharge-type light source lamp and a reflector that reflects the emitted light emitted from the light source lamp, and emits a light beam to the color separation optical device side. The light beam emitted from the light source device 41 is separated into R, G, and B color lights by the above-described color separation optical device.

The light modulation device 42 is composed of three liquid crystal panels respectively arranged on the optical paths of the R, G, and B color lights separated by the color separation optical device, and the incident light flux is output from the control device 6. Modulates according to image information. Image light corresponding to each color light modulated by each liquid crystal panel is synthesized by a color synthesis optical device.
The projection optical device 43 enlarges and projects the image light emitted from the light modulation device 42 and synthesized by the color synthesis optical device. The projection optical device 43 includes a projection lens 431, a magnification adjustment unit 432, and a focus position adjustment unit 433.

  The projection lens 431 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical barrel 4311 (see FIG. 1). The projection lens 431 includes a zoom lens that contributes to the magnification adjustment of the projection lens 431 and a focus lens that contributes to the focus position adjustment of the projection lens 431. The lens barrel 4311 is configured by connecting a plurality of members, and includes a zoom unit and a focus unit (not shown) to be described later.

  The magnification adjusting unit 432 adjusts the magnification of the projection lens 431 by moving the zoom lens back and forth along the incident direction of the light beam incident on the zoom lens (the central axis of the transmission region of the incident light beam and the traveling direction of the incident light beam). To do. The magnification adjusting unit 432 includes a zoom unit of the lens barrel 4311 and a zoom ring 4321 (see FIG. 1) that drives the zoom unit. The zoom unit rotates to move the zoom lens back and forth along the incident direction of the light beam incident on the zoom lens. The zoom ring 4321 is fitted to the lens barrel 4311 in a rotatable state. A knob 4322 is formed on the zoom ring 4321. The zoom ring 4321 is rotated by the user operating the knob 4322, thereby rotating the zoom unit to change the magnification of the projection lens 431. Specifically, the zoom ring 4321 increases the magnification of the projection lens 431 by rotating from a predetermined reference position (position in FIG. 1) to the arrow A1 side (wide end side) in FIG. Enlarge the area. Further, the zoom ring 4321 rotates from a predetermined reference position to the arrow A2 side (tele end side) in FIG. 1, thereby reducing the magnification of the projection lens 431 and reducing the contour of the projected image.

  The focus position adjusting unit 433 moves the focus lens forward and backward along the incident direction of the light beam incident on the focus lens (the central axis of the transmission region of the incident light beam and the traveling direction of the incident light beam), thereby moving the focus position of the projection lens 431. Adjust. The focus position adjusting unit 433 includes a focus unit of the lens barrel 4311 and a focus ring 4331 (see FIG. 1) that drives the focus unit. The focus unit rotates to move the focus lens back and forth along the incident direction of the light beam incident on the focus lens. The focus ring 4331 is fitted to the lens barrel 4311 in a rotatable state. The outer periphery of the focus ring 4331 is knurled. The focus ring 4331 is operated and rotated by the user, thereby rotating the focus unit and moving the focus position of the projection lens 431. Specifically, the focus ring 4331 is rotated from the predetermined reference position to the arrow A1 side in FIG. 1, thereby moving the focus position of the projection lens 431 from the predetermined reference position to the front side in the image light projection direction (away from the projector). 1) and rotating from the predetermined reference position to the arrow A2 side in FIG. 1, the focus position is moved from the predetermined reference position to the projection direction base end side (side approaching the projector).

Returning to FIG. 2, the projection position adjustment device 44 moves the lens barrel 4311 to the left and right and moves the projection lens 431 (projection optical device 43) to the left and right to adjust the left and right positions of the projection image on the screen Sc. To do. The projection position adjusting device 44 includes a fixed plate (not shown), a moving plate, a pressing member, and a drive mechanism.
The fixed plate is fixed so that the plate surface is parallel to a plane orthogonal to the projection direction of the image light of the projection optical device 43, and other configurations (moving plate, pressing member) in the lens barrel 4311 and the projection position adjusting device 44. , Driving mechanism).

The movable plate supports the lens barrel 4311 (projection lens 431) and is configured to be movable in the left-right direction along the plate surface of the fixed plate.
The pressing member presses and fixes the moving plate to the fixed plate in a state where the moving plate is movable.
A drive mechanism is comprised with a gearwheel and a link member, and moves a moving board to right and left. This drive mechanism includes the above-described dial 441 (see FIG. 1) exposed from the exterior housing 11. Then, the drive mechanism causes the dial 441 to be rotated in the X1 direction by the user, thereby moving the moving plate to the left side (arrow L side in FIG. 1) when viewed from the rear of the projector. That is, the drive mechanism moves the lens barrel 4311 (projection lens 431) to the left side via the moving plate and moves the position of the projection image on the screen Sc to the left side by rotating the dial 441 in the X1 direction. . Further, the driving mechanism moves the moving plate to the right side (the arrow R side in FIG. 1) when the user rotates the dial 441 in the X2 direction when viewed from the rear of the projector. That is, the driving mechanism moves the lens barrel 4311 (projection lens 431) to the right side via the moving plate and moves the position of the projection image on the screen Sc to the right side by rotating the dial 441 in the X2 direction. .

  The lens parameter acquisition unit 5 acquires various parameters related to the projection lens 431, that is, the magnification of the projection lens 431, the movement amount of the focus position, and the lens shift amount that is the movement amount of the projection lens 431 (projection optical device 43). . As will be described later, these parameters are positional relationship parameters of the present invention that vary depending on the positional relationship in the left-right direction between the installation position of the projector 1 and the projection image formation position. The lens parameter acquisition unit 5 includes a zoom lens movement amount acquisition unit 51, a focus lens movement amount acquisition unit 52, and a lens shift amount acquisition unit 53.

  The zoom lens movement amount acquisition unit 51 acquires the movement amount of the zoom lens and outputs it to the control device 6. The zoom lens movement amount acquisition unit 51 includes, for example, a resistor provided in the zoom ring 4321 and a circuit connected to the resistor. Here, the resistance value of the circuit corresponds to the rotation amount of the zoom ring 4321, and the rotation amount of the zoom ring 4321 corresponds to the movement amount of the zoom lens. That is, the movement amount of the zoom lens can be calculated from the resistance value. Therefore, the zoom lens movement amount acquisition unit 51 calculates and acquires the movement amount of the zoom lens from the detected resistance value of the circuit. Specifically, in the zoom lens movement amount acquisition unit 51, when the zoom ring 4321 is turned to the wide end side (A1 side) and the zoom lens moves in a direction to increase the magnification of the projection lens 431 from a predetermined reference position. When the zoom lens 4321 is moved to the telephoto end side (A2 side) and the zoom lens is moved from the predetermined reference position in the direction of decreasing the magnification of the projection lens 431, the zoom lens 4321 is small. Get the zoom lens movement amount of the value.

  The focus lens movement amount acquisition unit 52 acquires the movement amount of the focus position of the projection lens 431 and outputs it to the control device 6. Similar to the zoom lens movement amount acquisition unit 51, the focus lens movement amount acquisition unit 52 includes, for example, a resistor provided in the focus ring 4331 and a circuit connected to the resistor, and detects the resistance of the detected circuit. The amount of movement of the focus lens is calculated and acquired from the value. Specifically, the focus lens movement amount acquisition unit 52 rotates the focus ring 4331 to the A1 side, and the focus lens moves the focus position of the projection lens 431 from the predetermined reference position to the front end side in the image light emission direction. When the lens moves in the direction, a positive focus lens movement amount is acquired. In addition, the focus lens movement amount acquisition unit 52 rotates the focus ring 4331 to the A2 side so that the focus lens moves the focus position of the projection lens 431 from the predetermined reference position to the proximal side in the image light emission direction. If it has moved, a negative focus lens movement amount is acquired.

  The lens shift amount acquisition unit 53 is an optical device movement amount acquisition unit of the present invention, acquires a movement amount (lens shift amount) in the left-right direction of the projection lens 431 (projection optical device 43), and outputs the movement amount to the control device 6. . The lens shift amount acquisition unit 53 includes, for example, a resistor provided on the dial 441 and a circuit connected to the resistor, as in the detection units 51 and 52. From the detected resistance value of the circuit. The lens shift amount is calculated and acquired. Specifically, the lens shift amount acquisition unit 53 acquires the lens shift amount as a positive value when the dial 441 is turned to the X1 side and the projection lens 431 moves to the left side as viewed from the rear of the projector 1. Further, the lens shift amount acquisition unit 53 acquires the lens shift amount as a negative value when the dial 441 is turned to the X2 side and the projection lens 431 moves to the right side when viewed from the rear of the projector 1.

  In the present embodiment, each of the acquisition units 51 to 53 is provided separately from the control device 6, but may be provided in the control device 6. That is, for example, a detection unit that detects a parameter corresponding to the movement amount of the zoom ring 4321 (for example, a resistance value in the present embodiment) is provided separately from the zoom lens movement amount acquisition unit 51, and the zoom lens movement amount acquisition unit 51 includes: The amount of movement of the zoom lens may be calculated and acquired from the parameter detected by the detection means. The same applies to the acquisition units 52 and 53.

  In this embodiment, the zoom lens, the focus lens, and the projection lens 431 are manually moved, but may be moved electrically. That is, for example, a pulse motor that rotates the zoom lens according to the operation of the operation unit 2 is provided, and a detection unit such as a rotary encoder that detects the amount of rotation of the pulse motor is provided, and is detected by the detection unit such as the rotary encoder. The zoom lens movement amount acquisition unit 51 may calculate and acquire the movement amount of the zoom lens from the rotation amount of the pulse motor. The same applies to the acquisition units 52 and 53.

The control device 6 is configured as a circuit board on which a CPU (Central Processing Unit) and a storage device are mounted, and controls the projector 1 as a whole. In addition, the control device 6 performs volume adjustment and sound quality adjustment of the left and right speakers 31 and 32 based on the acquired positional relationship parameters. For this purpose, the control device 6 includes an image acquisition unit 60, a sound acquisition unit 61, a first control unit 62, a second control unit 63, and a storage unit 64.
The storage unit 64 stores various correction value tables T1 to T4 related to the correction of the audio signal, which will be described in detail later.

The image acquisition means 60 acquires image information related to the emitted image light from an external device such as a laptop computer connected to the projector.
The sound acquisition unit 61 acquires a sound signal related to the output sound from an external device such as a notebook computer connected to the projector. The audio signal includes a left audio signal for the left speaker 31 and a right audio signal for the right speaker 32.

The first control means 62 performs a predetermined process on the acquired image information and outputs it to the light modulation device 42. The predetermined processing includes image size adjustment, trapezoidal distortion correction, image quality adjustment, and gamma correction related to image information. The size adjustment, image quality adjustment, and gamma correction are well-known techniques. Therefore, only the trapezoidal distortion correction related to the feature of the present invention will be described below. The first control unit 62 includes a distortion correction unit 621, a correction amount acquisition unit 622, and a first output unit 623.
The first output unit 623 outputs the image information corrected by the distortion correction unit 621 and the like to the light modulation device 42.

FIG. 3 is a diagram illustrating an image related to the corrected image information.
The distortion correction unit 621 is a distortion correction unit of the present invention, and performs horizontal trapezoidal distortion correction (horizontal keystone correction) on the acquired image information. Here, as shown in FIG. 3, when the projector 1 is installed on the right side (right side when viewed from the rear of the projector, the same applies hereinafter) with respect to the screen Sc, and is inclined toward the screen Sc, In the projection image A formed on the right side, the width on the right side becomes narrower and the width on the left side (left side as viewed from the rear of the projector, hereinafter the same) becomes wider. Therefore, in such a case, the distortion correction unit 621 expands the right side width and the left side width of the image related to the image information to the image information by the operation of the operation unit 2 by the user. Distortion correction is performed to suppress distortion that occurs in the projected image formed on the screen Sc. In the case where the projector 1 is installed on the left side with respect to the screen Sc and is inclined with respect to the screen Sc, the distortion correction unit 621 is related to the image information in contrast to the above case. Horizontal trapezoidal distortion correction is performed to widen the left side of the image and narrow the right side.

  The correction amount acquisition unit 622 acquires the distortion correction amount (keystone correction amount) of the distortion correction unit 621 for the image information. For example, when the distortion correction unit 621 performs horizontal trapezoidal distortion correction on the image information to increase the width on the right side and the width on the left side of the image related to the image information, the correction amount acquisition unit 622 adds positive distortion. When the correction amount is acquired, and the distortion correction unit 621 performs horizontal trapezoidal distortion correction on the image information to widen the left side width and narrow the right side width of the image related to the image information, the negative distortion correction amount To get. Further, when the distortion correction unit 621 performs correction for further distorting the image, a larger value of distortion correction amount is acquired. As will be described in detail later, this distortion correction amount is a positional relationship parameter of the present invention that varies depending on the positional relationship in the left-right direction between the installation position of the projector 1 and the formation position of the projection image. The parameter acquisition unit of the present invention includes the correction amount acquisition unit 622 and the acquisition units 51 to 53 described above.

The second control means 63 performs volume adjustment and sound quality adjustment for each of the speakers 31 and 32. The second control unit 63 includes a determination unit 630, a correction unit 631, and a second output unit 632 that is an output unit of the present invention.
The determination unit 630 determines whether or not both the lens shift amount acquired by the lens shift amount acquisition unit 53 and the distortion correction amount acquired by the correction amount acquisition unit 622 are zero. In the present embodiment, the determination unit 630 determines whether the acquired lens shift amount and the distortion correction amount are both 0, but the acquired lens shift amount and the distortion correction amount are determined. It is good also as what determines whether both are in a predetermined range.

  Here, when the projector 1 is installed in front of the center of the screen Sc (a region where image light is desired to be projected on the projection surface), the lens shift in the left-right direction is unnecessary and is not performed, so the lens shift amount is 0. And get. Further, since no distortion occurs in the projected image and no distortion correction is performed, the distortion correction amount is also acquired as 0.

  When the projector 1 is installed in the center front of the screen Sc, the installation position of the projector and the viewing position of the user are both positioned in the image light projection direction, and the viewing position of the user is left and right. Therefore, even if the left and right audio signals are not corrected, it is possible to output the sound with balanced left and right volume and sound quality from the speakers 31 and 32. Accordingly, when the acquired lens shift amount and distortion correction amount are both determined to be 0 by the determination unit 630, the correction unit 631 described later does not correct the audio signal.

  On the other hand, when the projector 1 is installed at a position shifted in the left-right direction with respect to the screen Sc, in order to move the projection image onto the screen Sc, the projector 1 is tilted and the projector 1 is inclined and projected. Since distortion correction is performed to suppress distortion generated in the image, the lens shift amount or the distortion correction amount is acquired with a value other than zero. In this case, the installation position of the projector 1 and the formation position of the projected image on the screen Sc (projection surface), that is, the viewing position of the user are shifted in the left-right direction. Getting worse. Therefore, when the determination unit 630 determines that the acquired lens shift amount and distortion correction amount are not 0, the correction unit 631 described later outputs an audio signal so as to suppress the deterioration of the sound volume and sound quality balance. to correct.

The correcting unit 631 is a correcting unit according to the present invention, and based on each positional relationship parameter acquired by each of the acquiring units 51 to 53 and the correction amount acquiring unit 622, the viewing position of the user and the installation position of the projector 1 are calculated. The audio signal is corrected so as to suppress the deterioration of the sound volume balance and sound quality (including phase, delay amount, etc.) balance of the left and right speakers 31, 32 due to the positional relationship in the left-right direction. Specifically, the correction unit 631 obtains a correction coefficient corresponding to each positional relationship parameter from the storage unit 64 and substitutes it in the following equation (1), whereby the volume Lv related to the left audio signal is determined by the user. Is corrected from the reference value Sp set by the operation of the operating means 2 or the like. Further, the correction unit 631 acquires the correction coefficient corresponding to each positional relationship parameter from the storage unit 64, and corrects the volume Rv related to the right audio signal from the reference value Sp by substituting it into the following equation (2). .
Lv = Sp × (1+ (Shle + Shll) × z × f) (1)
Rv = Sp × (1+ (Shre + Shrl) × z × f) (2)
Note that Shle and Shre are correction coefficients related to the lens shift amount, and Shll and Shrl are correction coefficients related to the distortion correction amount. Further, z is a correction coefficient related to the movement amount of the zoom lens, and f is a correction coefficient related to the movement amount of the focus lens. Hereinafter, each of these correction coefficients will be described.

FIG. 4 is a diagram showing the relationship between the lens shift amount and the viewing position of the user with respect to the projector 1.
As shown in FIG. 4, when the magnification adjustment unit 432 moves the projection lens 431 to the left side when viewed from the rear of the projector 1 and moves the position of the projection image to the left side from the projector 1, the lens shift amount acquisition unit 53 The lens shift amount with a positive value is acquired. As described above, when a positive lens shift amount is acquired by the lens shift amount acquisition unit 53, the viewing position of the user viewing the projection image in the center front of the projection image is located on the left side of the projector 1. It becomes. Therefore, when the lens shift amount acquisition unit 53 acquires a positive lens shift amount, the correction unit 631 reduces the volume Lv of the left speaker 31 and increases the volume Rv of the right speaker 32. Correct the signal. Conversely, when a negative lens shift amount is acquired by the lens shift amount acquisition unit 53, the viewing position of the user is positioned on the right side of the projector 1, and thus the correction unit 631 is connected to the right speaker 32. The audio signal is corrected so that the volume Rv of the left speaker 31 is increased while the volume Rv is decreased. Here, the larger the absolute value of the lens shift amount is, the larger the amount of movement of the projected image is, so that the user's viewing position is far from the projector 1 in the left-right direction. Therefore, at the time of the correction, the correction unit 631 corrects the audio signal so that the difference between the left and right sound volumes Lv and Rv increases as the absolute value of the acquired lens shift amount increases.

FIG. 5 is a diagram showing the relationship between the lens shift amount and the correction coefficients Shle and Shre.
Specifically, as described above, the correction unit 631 acquires the correction coefficients Shle and Shre corresponding to the lens shift amount from the storage unit 64, and substitutes them in the equations (1) and (2) to thereby change the left and right. Are corrected from the reference value Sp. Therefore, as shown in FIG. 5, the storage unit 64 stores a first correction value table T1 in which the correction coefficients Shle and Shre are associated with the lens shift amount. In the correction value table T1, the positive lens shift amount is associated with a correction coefficient Shle (minus value) for decreasing the volume Lv of the left speaker 31, and a correction coefficient Shre for increasing the volume Rv of the right speaker 32. (Plus value) is associated. Conversely, a negative lens shift amount is associated with a correction coefficient Shle (a positive value) that increases the volume Lv of the left speaker 31 and a correction coefficient Shre (a negative value) that decreases the volume Rv of the right speaker 32. Is associated. The correction coefficients Shle and Shre are associated with each other so that the difference between the left and right sound volumes Lv and Rv increases as the absolute value of the lens shift amount increases. Accordingly, the correction unit 631 acquires the correction coefficients Shle and Shre corresponding to the acquired lens shift amount from the storage unit 64, and substitutes them in the equations (1) and (2), thereby obtaining the installation position of the projector 1. The audio signal can be corrected in accordance with the positional relationship in the left-right direction with the viewing position of the user, and the deterioration of the volume balance due to the positional relationship between the installation position of the projector 1 and the viewing position of the user can be prevented. .

FIG. 6 is a diagram illustrating the distortion correction amount and the viewing position of the user with respect to the projector 1.
The projector 1 is installed with the left and right positions shifted with respect to the screen Sc, and the projector 1 is inclined with respect to the screen Sc, so that the position of the projected image on the screen Sc can be adjusted regardless of the lens shift as described above. May be adjusted. In such a case, since a distortion occurs in the projected image formed on the screen Sc, as described above, the distortion correction of the projection image is performed by the distortion correcting unit 621.

  At this time, as shown in FIG. 6, when the distortion correction unit 621 performs distortion correction to reduce the width on the left side of the image and increase the width on the right side, that is, distortion of a positive value by the correction amount acquisition unit 622. When the correction amount is acquired, the viewing position of the user is located on the left side of the projector 1. Therefore, when the acquired distortion correction amount is a positive value, the correction unit 631 corrects the audio signal so that the volume Lv of the left speaker 31 is decreased and the volume Rv of the right speaker 32 is increased. Conversely, when the acquired distortion correction amount is a negative value, the correction unit 631 reduces the volume Rv of the right speaker 32 because the user's viewing position is located on the right side of the projector 1. At the same time, the audio signal is corrected so that the volume Lv of the left speaker 31 is increased.

  Further, the larger the absolute value of the distortion correction amount is, the more the projector 1 is arranged to be inclined with respect to the screen Sc, and the projection image formation position (screen Sc) is further away from the projector in the left-right direction. That is, the viewing position of the user is separated from the projector 1 in the left-right direction. Therefore, at the time of the correction, the correction unit 631 corrects the audio signal so that the difference between the left and right sound volumes Lv and Rv increases as the absolute value of the acquired distortion correction amount increases.

FIG. 7 is a diagram illustrating the relationship between the distortion correction amount and the correction coefficients Shll and Shrl.
Specifically, the correction unit 631 acquires the correction coefficients Shll and Shrl corresponding to the distortion correction amounts from the storage unit 64, and substitutes them in the equations (1) and (2), whereby the left and right volume Lv, Rv. Is corrected from the reference value Sp. Therefore, as shown in FIG. 7, the storage unit 64 stores a second correction value table T2 in which the correction coefficients Shll and Shrl are associated with the distortion correction amount. In this correction value table T2, the correction unit 631 can suitably adjust the left and right volume balance based on the positional relationship between the projector 1 and the user in the left-right direction, similar to the correction value table T1 described above. As described above, the correction coefficients Shll and Shrl are associated with the distortion correction amount.

  That is, the positive distortion correction amount acquired when the user is located on the left side of the projector 1 is associated with the correction coefficient Shle (negative value) for reducing the volume Lv of the left speaker 31 and the right speaker. A correction coefficient Shrl (plus value) that increases the volume Rv of 32 is associated. Further, the negative distortion correction amount acquired when the user is located on the right side of the projector is associated with a correction coefficient Shrl (negative value) for reducing the volume Rv of the right speaker 32 and the left speaker 31. Is associated with a correction coefficient Shll (a positive value) that increases the volume Lv of. Further, the correction coefficients Shll and Shrl are associated so that the difference between the left and right sound volumes Lv and Rv increases as the absolute value of the distortion correction amount increases. Therefore, the correction unit 631 acquires the correction coefficients Shll and Shrl corresponding to the acquired distortion correction amount from the storage unit 64 and substitutes them into the equations (1) and (2), thereby obtaining the installation position of the projector 1. The audio signal can be corrected in accordance with the positional relationship in the left-right direction with the viewing position of the user, and the deterioration of the volume balance due to the positional relationship between the installation position of the projector 1 and the viewing position of the user can be prevented. .

FIG. 8 is a diagram illustrating the amount of movement of the zoom lens and the viewing position of the user with respect to the projector 1.
As shown in FIG. 8, as the magnification adjusting unit 432 moves the zoom lens to increase the magnification of the projection lens 431, the outline of the projection image is enlarged and the center of the projection image is separated from the projector. Therefore, as the movement amount of the zoom lens acquired by the zoom lens movement amount acquisition unit 51 is larger, the viewing position of the user who views the projection image at the center of the front of the projection image is a position away from the projector 1 in the left-right direction. Become. Accordingly, the correction unit 631 increases the volume of the speaker closer to the user and increases the volume of the speaker farther from the user as the acquired amount of movement of the zoom lens increases (right and left). The sound signal is corrected so as to increase the difference between the sound volumes Lv and Rv. Further, when the movement amount of the zoom lens is small, that is, when the user's viewing position is close to the projector 1, the correction unit 631 corrects the audio signal so as to reduce the difference between the left and right volume Lv, Rv. To do.

FIG. 9 is a diagram showing the relationship between the movement amount of the zoom lens and the correction coefficient z.
Specifically, the correction unit 631 acquires the correction coefficient z corresponding to the amount of movement of the zoom lens from the storage unit 64, and substitutes the left and right volume Lv, Rv into the equations (1) and (2). to correct. Therefore, as shown in FIG. 9, the storage unit 64 stores a third correction value table T3 in which the correction coefficient z is associated with the amount of movement of the zoom lens. In this correction value table T3, for a large amount of zoom lens movement obtained when the viewing position of the user is far from the projector 1 in the left-right direction, the volume of the speaker closer to the user is made smaller. A correction coefficient z (1.1) for increasing the volume of the speaker farther to the user (increasing the difference between the left and right volume Lv, Rv) is associated with the projector so that the viewing position of the user is in the horizontal direction. A correction value z (0.9) for reducing the difference between the left and right sound volumes Lv and Rv is associated with the small amount of movement of the zoom lens acquired when it is close to 1. Accordingly, the correction unit 631 acquires the correction coefficient z corresponding to the acquired movement amount of the zoom lens from the storage unit 64, and substitutes the correction coefficient z into the expressions (1) and (2), thereby obtaining the installation position of the projector 1. The audio signal can be corrected in accordance with the positional relationship in the left and right direction with the user's viewing position, and the volume balance is deteriorated due to the positional relationship in the left and right direction between the installation position of the projector 1 and the viewing position of the user. Can be prevented.

FIG. 10 is a diagram showing the amount of movement of the focus lens and the viewing position of the user with respect to the projector 1.
As shown in FIG. 10, as the focus position adjusting unit 433 moves the focus lens and moves the focus position of the projection lens 431 toward the front end side in the projection direction of the image light, a projection image is formed at a position farther from the projector 1. Therefore, the outline of the projected image is enlarged, and the center of the projected image is separated from the projector 1. In other words, the viewing position of the user moves away from the projector 1 in the left-right direction.

  Here, when the focus position adjustment unit 433 moves the focus lens so as to move the focus position of the projection lens 431 from the predetermined reference position to the front side in the projection direction of the image light, the focus lens movement amount acquisition unit 52 The focus lens movement amount of plus value is acquired. Conversely, when the focus position adjustment unit 433 moves the focus lens so as to move the focus position of the projection lens 431 from the predetermined reference position to the proximal side in the projection direction of the image light, the focus lens movement amount acquisition unit 52 Obtains a negative focus lens movement amount.

  Therefore, when the viewing position of the user is away from the projector 1 in the left-right direction, that is, when the acquired focus lens movement amount is a positive value, the correction unit 631 is connected to the speaker closer to the user. And the sound signal is corrected so that the volume of the speaker farther from the user is increased (the difference between the left and right volume Lv and Rv is increased). In addition, when the viewing position of the user is close to the projector 1 in the left-right direction, that is, when the acquired amount of movement of the focus lens is a negative value, the correction unit 631 calculates the difference between the left and right volume Lv, Rv. Correct the audio signal to make it smaller.

FIG. 11 is a diagram illustrating the relationship between the movement amount of the focus lens and the correction coefficient f.
Specifically, the correction unit 631 acquires the correction coefficient f corresponding to the focus lens movement amount from the storage unit 64, and corrects the left and right sound volumes Lv and Rv by substituting them into the equations (1) and (2). To do. Therefore, as shown in FIG. 11, the storage unit 64 stores a fourth correction table T4 in which the correction coefficient f is associated with the focus lens movement amount. In the correction table T4, the positive focus lens movement amount acquired when the user's viewing position is far from the projector 1 reduces the volume of the speaker closer to the user and further away from the user. Is associated with a correction coefficient f (1.1) that increases the volume of the speakers (increases the difference between the left and right volume Lv, Rv). Further, a correction coefficient f (0.9) for reducing the difference between the left and right sound volumes Lv and Rv is associated with the negative focus lens movement amount acquired when the viewing position of the user is close to the projector 1. ing. Accordingly, the correction unit 631 acquires the correction coefficient f corresponding to the acquired focus lens movement amount from the storage unit 64, and substitutes the correction coefficient f into the above formulas (1) and (2) to thereby determine the installation position and use of the projector 1. The audio signal can be corrected in accordance with the positional relationship in the left and right direction with respect to the viewing position of the user, and the volume balance caused by the positional relationship in the lateral direction between the installation position of the projector 1 and the viewing position of the user can be reduced. Can be prevented.

[Audio signal correction by projector]
Hereinafter, the audio signal correction processing by the projector 1 will be described.
FIG. 12 is a flowchart showing audio signal correction processing by the projector 1.
The following steps are executed when the projector 1 is turned on. When the projector 1 is turned on, the sound acquisition unit 61 acquires left and right audio signals related to the sound output from the left and right speakers 31 and 32 from an external device such as a laptop computer connected to the projector 1. (Step S1).

  After step S1, the lens shift amount acquisition unit 53 acquires the amount of movement (lens shift amount) of the projection lens 431 in the left-right direction and outputs it to the control device 6 (step S2). This lens shift amount is a positional relationship parameter of the present invention that varies depending on the positional relationship in the left-right direction between the installation position of the projector 1 and the formation position of the projection image. When the projector 1 is installed at the front center of the screen Sc (a region where image light is desired to be projected on the projection surface), the lens shift amount is acquired as zero.

  After step S2, the correction amount acquisition unit 622 acquires the distortion correction amount of the distortion correction unit 621 for the image information (step S3). This distortion correction amount is also a positional relationship parameter. In addition, when the projector 1 is installed in the front center of the screen Sc (a region where image light is desired to be projected on the projection surface), this distortion correction amount is also acquired as zero. Even when the projector 1 is installed at a position shifted in the left-right direction with respect to the screen Sc, if the projection image is moved on the screen Sc by performing lens shift, the distortion correction amount is Acquired as 0.

After step S3, the zoom lens movement amount acquisition unit 51 acquires the movement amount of the zoom lens, which is a positional relationship parameter, and outputs it to the control device 6 (step S4).
After step S4, the focus lens movement amount acquisition unit 52 acquires the movement amount of the focus lens, which is a positional relationship parameter, and outputs it to the control device 6 (step S5).

  After step S5, the determination unit 630 determines whether or not both the lens shift amount acquired by the lens shift amount acquisition unit 53 and the distortion correction amount acquired by the correction amount acquisition unit 622 are 0 (step). S6). When the determination unit 630 determines that both the acquired lens shift amount and the complementary distortion correction amount are 0 (step S6: YES), the audio signal is output to the second output without being corrected by the correction unit 631. The signal is output to the speakers 31 and 32 by the unit 632 (step S8).

  On the other hand, when the determination unit 630 determines that the acquired lens shift amount and the complementary distortion correction amount are not both 0 (step S6: NO), the correction unit 631 is based on each acquired positional relationship parameter. The left and right audio signals are corrected so as to suppress the deterioration of the sound volume and sound quality balance caused by the positional relationship between the installation position of the projector 1 and the viewing position of the user in the left-right direction (step S7). At this time, when the projection image is moved by the lens shift, the distortion correction amount is not normally performed and the distortion correction amount is acquired as 0. Therefore, the correction unit 631 moves the lens shift amount and the zoom lens. The audio signal is corrected based on the amount and the movement amount of the focus lens. When the projection image is positioned on the screen Sc by arranging the projector 1 so as to be inclined toward the screen Sc, the lens shift is not normally performed and the lens shift amount is acquired as 0. The correction unit 631 corrects the audio signal based on the distortion correction amount, the movement amount of the zoom lens, and the movement amount of the focus lens. However, when the movement of the projection image is performed by both the lens shift and the inclination arrangement of the projector 1, the correction unit 631 performs the lens shift amount, the distortion correction amount, the zoom lens movement amount, and the focus lens movement amount. Based on the above, the audio signal may be corrected. The audio signal corrected by the correcting unit 631 is output to the speakers 31 and 32 by the second output unit 632 (step S8). Thereby, the deterioration of the balance of sound volume and sound quality resulting from the positional relationship between the installation position of the projector 1 and the viewing position of the user in the left-right direction is suppressed.

[Effect of this embodiment]
According to the projector 1 of the present embodiment as described above, the following effects can be obtained.
The parameter acquisition means 51, 52, 53, 622 acquires positional relationship parameters related to the positional relationship in the left-right direction between the installation position of the projector 1 and the formation position of the projection image. Then, the correcting unit 631 has a positional relationship in the left-right direction between the projector 1 and the projected image, that is, a positional relationship in the left-right direction between the projector 1 and the viewing position of the user who views the projected image at the front center of the projected image. On the basis of the positional relationship parameters indicating the sound volume, the balance between the volume and sound quality of the left and right speakers 31 and 32 having different distances in the left and right direction from the user is adjusted.
For example, when the positional relationship parameter indicates that the user's viewing position (projected image formation position) is on the left side of the projector 1, the correction unit 631 determines that the left speaker 31 (from the user's viewing position). The sound signal is corrected so that the volume of the speaker on the side closer to the distance is reduced and the volume of the right speaker 32 (the speaker on the side far from the viewing position of the user) is increased. Further, when the positional relationship parameter indicates that the viewing position of the user is away from the projector 1 in the left-right direction, the correction unit reduces the volume of the speaker on the side closer to the user. Then, the audio signal is corrected so as to increase the volume of the speaker on the side farther from the user. Conversely, if the positional relationship parameter indicates that the viewing position of the user is close to the projector in the left-right direction, the audio signal is corrected so as to reduce the difference in volume between the left and right. Therefore, it is possible to suppress the deterioration in the balance between the volume and sound quality of the left and right speakers 31 and 32 due to the positional relationship between the installation position of the projector 1 and the viewing position of the user.
Further, since the correcting unit 631 automatically corrects the audio signal based on the acquired positional relationship parameter, the user does not need to manually adjust the volume and sound of each speaker 31 and 32, and the projector 1 Convenience can be improved.

  The amount of movement of the projection optical device 43 in the left-right direction by the projection position adjusting device 44 is based on whether the viewing position of the user is on the left or right side of the projector 1, and the installation position of the projector 1 and the viewing position of the user. The distance in the left-right direction is shown. On the other hand, since the projector 1 includes the lens shift amount acquisition unit 53, the amount of movement in the left-right direction of the projection optical device 43 indicating the positional relationship between the installation position of the projector 1 and the viewing position of the user in the left-right direction. As a result, the correction unit 631 can correct the audio signal based on the movement amount of the projection optical device 43, so that it is possible to reliably suppress the deterioration of the balance between the sound volume and the sound quality of the speaker.

  The distortion correction amount of the image information by the distortion correction unit 621 is based on whether the viewing position of the user is on the left or right side of the projector, and the distance in the horizontal direction between the installation position of the projector 1 and the viewing position of the user. Show. On the other hand, since the projector 1 includes the correction amount acquisition unit 622, it is possible to acquire a distortion correction amount indicating the positional relationship between the installation position of the projector 1 and the viewing position of the user in the left-right direction. Since the unit 631 can correct the audio signal based on the correction amount of the image information, it is possible to more reliably suppress the deterioration of the balance between the volume and the sound quality of the speaker.

  The movement amount of the zoom lens indicates the distance in the left-right direction between the installation position of the projector 1 and the viewing position of the user. On the other hand, according to the present invention, since the projector 1 includes the zoom lens movement amount acquisition unit 51, the movement of the zoom lens indicating the distance in the left-right direction between the installation position of the projector 1 and the viewing position of the user. As a result, the correction unit 631 can correct the audio signal based on the amount of movement of the zoom lens, so that it is possible to more reliably suppress the deterioration of the balance between the loudness and sound quality of the speaker.

  The amount of movement of the focus lens indicates the distance in the left-right direction between the installation position of the projector 1 and the viewing position of the user. On the other hand, since the projector 1 includes the focus lens movement amount acquisition unit 52, the movement amount of the focus lens indicating the distance in the left-right direction between the installation position of the projector 1 and the viewing position of the user can be acquired. As a result, the correcting unit 631 can correct the audio signal based on the amount of movement of the focus lens, so that it is possible to more reliably suppress the deterioration of the balance between the sound volume and the sound quality of the speaker.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, the speaker is provided inside the outer casing 11, but the speaker may be attached to the projector 1 and provided outside the outer casing 11.
In the embodiment, only two speakers are provided, but a plurality of speakers may be provided.

  In the above embodiment, the audio signal is composed of two general channels (left and right). However, in addition to the normal left and right, the audio signal is a center left surround right surround and a low frequency sound effect ( It may be configured with three or more channels such as 5.1 channels including LFE). Therefore, a plurality of speakers may be provided outside the exterior housing 11 and may be configured to support audio output of 3 channels or more such as 5.1 channels. Even in such a case, the correcting means, based on the positional relationship between the installation position of the projector and the viewing position of the user in the left-right direction, the volume and sound quality of each speaker having different distances in the left-right direction from the user. You just have to adjust the balance. For example, the correcting means may reduce the volume of a speaker that is close to the user's viewing position in the left-right direction, and increase the volume of a speaker that is far from the user's viewing position among the plurality of speakers. The signal may be corrected.

  When a test image related to image information with uniform pixel luminance values is formed on the projection surface and the luminance values in the left-right direction of the test image are acquired by the imaging device, the peak position of the luminance value is the position of the projection image on the projection surface. The positional relationship in the left-right direction between the formation position (viewing position of the user) and the installation position of the projector is shown. Therefore, in the embodiment, the lens shift amount, the distortion correction amount, and the movement of the focus lens are used as the positional relationship parameters indicating the positional relationship between the installation position of the projector and the formation position of the projected image on the projection surface (user viewing position). Although the amount and the movement amount of the zoom lens are acquired, the peak position of the luminance value in the left-right direction of the test image may be acquired as the positional relationship parameter. In this case, the parameter acquisition unit includes a determination unit that determines the peak position of the luminance value.

FIG. 13 is a diagram showing a projector 1A according to a modification of the present invention.
Further, as shown in FIG. 13, the projector 1A includes a geomagnetic sensor that is a main body side detection unit, a main body 100 that has a relative angle calculation unit, and a remote device 110 that has a geomagnetic sensor that is a device side detection unit. . Then, the relative angle calculation means acquires the azimuth angle θ1 of the main body side reference line B1 by the geomagnetic sensor of the main body 100. Further, when the user or the like causes the remote device 110 to contact the screen Sc, the remote device 110 acquires the azimuth angle θ2 of the screen Sc (the azimuth angle θ2 of the device-side reference line B2) and outputs it to the main body 100. . Then, the relative angle calculation means calculates the relative angle θ3 from the azimuth angle θ1 of the main body side reference line B1 and the azimuth angle θ2 of the screen Sc. This relative angle θ3 is the positional relationship in the left-right direction between the installation position of the projector 1A in the left-right direction and the formation position of the projection image (user viewing position), that is, the user viewing position is on the right or left side of the projector 1A. This indicates how far the viewing position of the user is from the projector 1A in the left-right direction. Therefore, the relative angle θ3 may be acquired as the positional relationship parameter. In this case, the parameter acquisition unit includes a relative angle calculation unit.

  In the embodiment, the light modulation device is configured to include a transmissive liquid crystal panel having a light incident surface and a light emission surface different from each other. However, the light modulation device has the same light incident surface and light emission surface. It may be configured with a certain reflective liquid crystal panel, or may be configured with DMD (Digital Micromirror Device: trademark of Texas Instruments, USA).

  The present invention can be used for a projector because deterioration in the balance between the volume and sound quality of the left and right speakers can be suppressed, and can be suitably used particularly for a projector used for a presentation or home theater.

1 is a perspective view showing a projector according to an embodiment of the invention. The block diagram which shows the structure of the projector main body which concerns on the said embodiment. The figure which shows the image which concerns on the corrected image information which concerns on the said embodiment. The figure which shows the relationship between the lens shift amount which concerns on the said embodiment, and the user's viewing position with respect to a projector. The figure which shows the relationship between the lens shift amount and correction coefficient which concern on the said embodiment. The figure which shows the distortion correction amount which concerns on the said embodiment, and the user's viewing position with respect to a projector. The figure which shows the relationship between the distortion correction amount and correction coefficient which concern on the said embodiment. The figure which shows the moving amount | distance of the zoom lens which concerns on the said embodiment, and the user's viewing position with respect to a projector. The figure which shows the relationship between the movement amount of the zoom lens which concerns on the said embodiment, and a correction coefficient. The figure which shows the moving amount | distance of the focus lens which concerns on the said embodiment, and the user's viewing position with respect to a projector. The figure which shows the relationship between the movement amount of the focus lens which concerns on the said embodiment, and a correction coefficient. The flowchart which shows the correction | amendment process of the audio | voice signal which concerns on the said embodiment. The figure which shows the projector which concerns on the modification of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Projector, 31 ... Projection lens, 41 ... Light source device, 42 ... Light modulation device, 43 ... Projection optical device, 44 ... Projection position adjustment device, 51 ... Zoom lens movement amount acquisition part, 52 ... Focus lens movement amount Acquisition unit 53... Lens shift amount acquisition unit (optical device movement amount acquisition unit) 60. Image acquisition unit 61. Audio acquisition unit 432. Magnification adjustment unit 433 Focus position adjustment unit 621 Distortion correction unit ( Distortion correction means), 622... Correction amount acquisition section, 631... Correction section (correction means), 632... Second output section (output means).

Claims (5)

A light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information to form image light; and a projection image on the projection surface that is enlarged and projected on the projection surface. A projection optical device that forms a projector and a plurality of speakers,
An audio acquisition means for acquiring an audio signal;
Parameter acquisition means for acquiring positional relationship parameters relating to the positional relationship between the installation position of the projector and the formation position of the projection image on the projection surface;
Correction means for correcting the acquired audio signal based on the positional relationship parameters acquired by the parameter acquisition means;
An output means for outputting the corrected audio signal to the plurality of speakers. The projector according to claim 1,
A projection position adjusting device for adjusting the left and right position of the projection image on the projection surface by moving the projection optical device in the left and right direction;
The said parameter acquisition means is provided with the optical apparatus movement amount acquisition part which acquires the movement amount of the left-right direction of the said projection optical apparatus by the said projection position adjustment apparatus as said positional relationship parameter. The projector according to claim 1,
Image acquisition means for acquiring image information relating to image light to be projected;
Distortion correction means for correcting the image information acquired by the image acquisition means so that distortion does not occur in the projected image,
The projector, wherein the parameter acquisition unit includes a correction amount acquisition unit that acquires the correction amount of the image information by the distortion correction unit as the positional relationship parameter. The projector according to claim 2 or 3, wherein
The projection optical device includes a zoom lens, and a magnification adjustment unit that adjusts the magnification of the projection optical device by moving the zoom lens forward and backward along the incident direction of image light incident on the zoom lens.
The projector according to claim 1, wherein the parameter acquisition unit includes a zoom lens movement amount acquisition unit that acquires the movement amount of the zoom lens by the magnification adjustment unit as the positional relationship parameter. The projector according to any one of claims 2 to 4,
The projection optical device includes a focus lens, and a focus position adjustment unit that adjusts the focus position of the projection optical device by moving the focus lens forward and backward along the incident direction of image light incident on the focus lens.
The projector according to claim 1, wherein the parameter acquisition unit includes a focus lens movement amount acquisition unit that acquires a movement amount of the focus lens by the focus position adjustment unit as the positional relationship parameter.

Images