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JP2008283716

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DESCRIPTION JP2008283716
[PROBLEMS] To provide a projector capable of improving usability in a configuration having a
function having directionality other than trapezoidal distortion correction. SOLUTION: An audio
signal inputted from a terminal 25 is amplified by left and right amplifiers 31, 32 and the left
and right speakers 4, 5 different in the direction of sound amplification are driven to amplify the
sound attached to an image. The image processor 21a performs keystone correction of the image
data of the image input from the terminals 22 to 24 in response to the operation by pressing the
push switch 35. The microprocessor 21b is operated to calculate the installation angle with
respect to the screen of the apparatus body from the correction amount of the keystone
correction, and control the volume of the left and right amplifiers 31, 32 according to the
calculation result. The volume balance according to the installation angle can be automatically
secured to the left and right speakers 4 and 5 only by performing the keystone correction
operation. [Selected figure] Figure 3
プロジェクタ
[0001]
The present invention relates to a projector having a keystone correction function.
[0002]
2. Description of the Related Art Conventionally, in lectures such as presentations such as project
explanations and product descriptions and research presentations, a projector is used to project
an explanatory image created on a personal computer, for example, on a screen.
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1
In addition, in business presentation such as planning explanation, an image (document) with
sound may be used to enhance the presentation effect. Therefore, some projectors for business
use are provided with an audio signal input terminal, a speaker, and the like, and there are also
projectors capable of projecting an audio attached to the projector while projecting an
explanatory image.
[0003]
On the other hand, projectors are generally provided with a keystone correction function
(keystone correction) that eliminates keystone distortion that occurs on the projected screen
viewed from the front of the screen when not facing the screen. The keystone correction is
performed by distorting the input image in the direction opposite to the direction of distortion
occurring on the projection screen and then projecting. Also, as a correction method, a method of
manually adjusting the direction and amount of distortion (correction amount) of the distortion
while looking at the projection screen to the user, and a pair of distance sensors which are
separated from each other in the projector are detected. A method of calculating the inclination
(installation angle) of the projector with respect to the screen based on the result, and
automatically distorting the input image based on the calculation result (see, for example, Patent
Document 1). )とがある。
[0004]
JP 2000-122617 A
[0005]
However, the projector that can expand the sound attached to the above-described explanatory
image has the following problems.
[0006]
That is, in the projector described above, in order to allow the viewer to hear the sound from
anywhere, for example, the speaker is provided on the upper surface of the projector, the sound
is directed upward and the plural speakers are provided on the outer peripheral surface of the
projector Is projected from the projector in a plurality of directions.
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2
[0007]
However, in the case of the former, the sound reaching the viewer is mainly reflected by the
ceiling, wall, etc. of the room, and it becomes difficult for the viewer to hear the sound.
On the other hand, in the latter case, the above problem does not occur, but for example, when
used in a presentation, the projector is often arranged on the front side of the viewer and on the
left or right side not facing the screen. In the normal use state, the voice is large for the viewer
near the projector, and the voice is small for the far viewer.
Therefore, it is necessary to configure the projector so that a user such as an explainer can adjust
the volume of each speaker, and to allow the user to adjust the volume of each speaker according
to the use state.
Therefore, in that case, there is a problem that the volume adjustment operation prior to use
becomes complicated.
[0008]
The present invention has been made in view of such conventional problems, and it is an object
of the present invention to provide a projector capable of improving the usability in a
configuration having a function having directivity other than trapezoidal distortion correction. I
assume.
[0009]
In order to solve the above-mentioned problems, according to the invention of claim 1, in a
projector provided with a correction means for correcting trapezoidal distortion of a projected
image projected on a screen, the projector has a predetermined directivity different from that of
the correction means. Operating means for realizing the operation, angle acquisition means for
acquiring angle information indicating the installation angle of the device body with respect to
the screen, and the angle acquired by the angle acquisition means along with the trapezoidal
distortion correction operation by the correction means And control means for controlling the
directionality of the predetermined operation realized by the operation means based on the
information.
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[0010]
In such a configuration, as the trapezoidal distortion of the projected image is corrected, the
directionality of the predetermined operation having a directionality different from that is
controlled based on the installation angle of the device body with respect to the screen.
That is, in conjunction with the correction of the trapezoidal distortion, the predetermined
operation having the other directionality can be automatically adjusted based on the installation
angle of the apparatus body with respect to the screen.
[0011]
Further, according to the invention of claim 2, the angle acquisition means acquires angle
information based on a correction amount of trapezoidal distortion by the correction means.
[0012]
In such a configuration, even in a configuration that does not use a device such as a distance
sensor, it is possible to control the directivity of a predetermined operation having directivity
based on the installation angle of the device body with respect to the screen.
[0013]
Further, in the invention of claim 3, the operating means is a loudspeaker that amplifies a voice
input incidentally to the image to be projected, and the control means is configured to set the
loudspeaker direction of the voice by the loudspeaker as It shall be controlled.
[0014]
In such a configuration, as the trapezoidal distortion of the projection image is corrected, the
direction of sound amplification of the sound input incident to the image to be projected is
controlled based on the installation angle of the device body with respect to the screen.
[0015]
Further, in the invention of claim 4, the loudspeaker means comprises a plurality of loudspeaker
means for amplifying voices in different directions, and the control means comprises a plurality
of loudspeakers each of which is voiced by each of the plurality of loudspeaker means. The
volume was to be controlled.
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4
[0016]
In such a configuration, the volume of the sound to be amplified is controlled by each of the
plurality of loudspeakers, whereby the direction of sound amplification of the sound input
accompanying the image to be projected is controlled.
[0017]
Further, in the invention of claim 5, the operating means is a cooling means for performing
exhaust for the purpose of cooling the apparatus, and the control means controls the exhaust
direction of the cooling means.
[0018]
In such a configuration, as the trapezoidal distortion of the projection image is corrected, the
exhaust direction of the cooling means is controlled based on the installation angle of the
apparatus body with respect to the screen.
[0019]
In the invention of claim 6, the operation means is communication means, and the control means
controls the communication direction of the communication means.
[0020]
In such a configuration, as the trapezoidal distortion of the projected image is corrected, the
directivity of the communication means is controlled based on the installation angle of the device
body with respect to the screen.
[0021]
According to the seventh aspect of the present invention, there is provided a correction means
for correcting trapezoidal distortion of an image projected on the screen, and an operation means
for realizing a predetermined operation having a directionality different from that of the
correction means. Control the directionality of the predetermined operation realized by the
operation means based on angle information indicating the installation angle of the apparatus
body with respect to the screen, in accordance with the trapezoidal distortion correction
operation by the correction means, the computer included in the projector It is a program that
functions as control means.
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[0022]
As described above, in the first aspect of the present invention, in conjunction with the correction
of the trapezoidal distortion, the predetermined operation having the other directionality is
automatically adjusted based on the installation angle of the apparatus main body with respect to
the screen. I was able to do it.
Therefore, it becomes possible to improve the usability in the configuration provided with a
function having directionality other than the trapezoidal distortion correction.
[0023]
In the second aspect of the invention, even in the configuration without using a device such as a
distance sensor, it is possible to control the directivity of the predetermined operation having
directivity based on the installation angle of the device body with respect to the screen.
Thus, the cost of the apparatus can be reduced.
[0024]
According to the third aspect of the present invention, as the trapezoidal distortion of the
projected image is corrected, the direction of sound amplification of the sound input incidentally
to the image to be projected is controlled based on the installation angle of the device body with
respect to the screen. I did it.
Therefore, it becomes possible to automatically secure a better sound loudening operation
suitable for the difference in installation angle.
[0025]
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6
Further, in the invention of claim 4, by controlling the volume of the sound to be amplified by
each of the plurality of loudspeakers, the direction of sound amplification of the sound input
incidentally to the image to be projected is controlled. did.
This also makes it possible to automatically secure a better sound loudening operation suitable
for the difference in installation angle.
[0026]
According to the fifth aspect of the present invention, the exhaust direction of the cooling means
is controlled based on the installation angle of the apparatus body with respect to the screen as
the trapezoidal distortion of the projected image is corrected.
Therefore, it is possible to automatically secure a better cooling operation suitable for the
difference in installation angle.
[0027]
According to the sixth aspect of the present invention, the communication direction of the
communication means is controlled based on the installation angle of the apparatus main body
with respect to the screen as the trapezoidal distortion of the projection image is corrected.
Therefore, it is possible to automatically secure a better communication operation suitable for
the difference in installation angle.
[0028]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
FIG. 1 is a rear perspective view of the projector 1 according to the present invention as viewed
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from the rear side.
The projector 1 has a structure in which a projection unit 3 for emitting projection light is
provided on the front side of the main body 2, and left and right speakers 4 and 5 are provided
on left and right corners on the back side of the main body 2. A power cord 6 extends on the
back of the camera, and an input cable 7 corresponding to various video sources is attached for
inputting video signals and the like.
[0029]
FIG. 2 is an overall block diagram showing a schematic configuration of the projector 1.
The projector 1 includes an input image / sound processing circuit 11, an output image
processing circuit 12, an image conversion device 13, and an optical device 14.
[0030]
The input image / audio processing circuit 11 generates image data (digital data) from the video
signal input through the input cable 7 and outputs the data, or amplifies the input audio signal to
generate the left and right speakers 4, It is a circuit for driving 5 and performing processing etc.
for expanding the sound attached to the image.
The details will be described later.
[0031]
The output image processing circuit 12 converts image data (digital signal) sequentially input
from the input image / voice processing circuit 11 into a drive signal for driving the image
conversion device 13.
The image conversion device 13 is a DMD (Digital Micromirror Device) or the like which operates
09-05-2019
8
in response to the drive signal to convert image data into light.
The optical device 14 is composed of a lamp and a lens system for projection disposed in the
projection unit 3, and projects the image converted into light by the image conversion device 13
on the screen.
[0032]
FIG. 3 is a block diagram showing the details of the input image / sound processing circuit 11
described above. The input image / audio processing circuit 11 includes a control block 21 for
processing an image and an audio, a plurality of video input terminals to which various video
sources are input, that is, an "RGB / YCbCr In" terminal 22, "S Video In". And a “Composite
Video In” terminal 24, an “Audio In” terminal 25 to which an audio signal is input, and
components to be described later.
[0033]
The control block 21 incorporates an image processor 21a that performs various image
processing, a ROM, a RAM, etc. stored in a predetermined program, and a microprocessor 21b
that controls the operation of each unit described later according to the program. , And the OSD
controller 21d. Further, a flash memory 26 or the like that functions as a working memory of the
image processor 21a and the microprocessor 21b is connected to the control block 21. In the
present embodiment, the microprocessor 21b functions as an angle acquisition unit and a control
unit of the present invention, and the correction unit of the present invention is realized by the
image processor 21a and the microprocessor 21b.
[0034]
An image signal (RGB) from a personal computer is input from an “RGB / YCbCr In” terminal
22, analog-digital converted by an A / D converter (ADC) 27, and then input to the control block
21. The input image data is subjected to correction of RGB signal size and frame frequency,
correction of expansion and contraction of the image, keystone correction (keystone correction)
described later, etc. by the image processor 21a. The frames are stored and then transferred to
the output image processing circuit 12 (more specifically, the image processing unit in the
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circuit) of FIG.
[0035]
The video signal from the video deck etc. is input from the “S Video In” terminal 23 and the
composite image signal such as the TV image is input from the “Composite Video In” terminal
24 and digitized by the video decoder 28 and then controlled. The block 21 is input. Like the
RGB signals, the input image data is subjected to correction such as expansion and contraction of
the image by the image processor 21a, temporarily stored for one frame in the internal frame
buffer 21c, and transferred to the output image processing circuit 12.
[0036]
An audio signal attached to an image to be projected is input from an "Audio In" terminal 25,
amplified by the left and right amplifiers 31, 32, and then output as audio from the left and right
speakers 4, 5. The left and right amplifiers 31, 32 and the left and right speakers 4, 5 are the
sound amplification means of the present invention, and the amplification factor of the audio
signal in each of the amplifiers 31, 32 ie the volume of the sound amplified by the speakers 4, 5
It is configured to be individually controlled by the microprocessor 21b.
[0037]
Further, the control block 21 receives an infrared operation signal sent from a remote control
unit (not shown) and an image signal sent from an apparatus such as a PDA (Personal Digital
Assistant: portable information terminal) or a notebook computer by infrared rays. Therefore,
according to the USB standard between two infrared receivers (IR Receiver) 33 including infrared
light receiving elements, two display LEDs 34, three operation push switches 35, and peripheral
devices such as a PC and a mouse 37 A USB controller 36 for data transmission is connected. The
projector 1 of the present embodiment is provided with a manual keystone correction function,
and the push switch 35 is a switch used for a keystone correction operation by a user.
[0038]
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10
Next, the operation of the projector 1 configured as above will be described. Here, as shown in
FIG. 4A, the projector 1 is installed on the right side of the projection screen 100 in an arbitrary
room, and a plurality of viewers 200 face the projection screen 100 in a U-shape. Suppose that
you are seated. In addition, it is assumed that an image output from an arbitrary video source
such as a PC and accompanied by audio is input to the projector 1.
[0039]
FIG. 5 is a flowchart showing the operation at that time. That is, the projector 1 starts its
operation by turning on the power, and starts projecting an image (moving image or still image)
based on the input video signal (step S1). At this time, in the use state, as shown in FIG. 4B, the
projection light L of the projector 1 is inclined to the right with respect to the projection screen
100, and the projection distance to the projection screen 100 is left compared to the right. Is
getting longer. Therefore, at the beginning of use, the input image G1 as shown in FIG. 6 (a) (the
letter “positive” in FIG. 6) is left and right on the projection screen 100 as shown in FIG. 6 (b).
A trapezoidal distortion in the direction occurs, and the left side becomes a trapezoidal projected
image S1 expanded in the vertical direction.
[0040]
Therefore, the user looks at the projected image S1 and performs keystone correction of the
image, and the user performs a keystone correction operation by pressing the push switch 35 for
correcting and projecting the image (step S2). YES), the microprocessor 21b recognizes the
operation and causes the image processor 21a to perform keystone correction corresponding to
the user's operation (step S3). That is, correction is performed to narrow the vertical direction on
the left side of the projection image S1. Then, this process is repeated until the end instruction of
the keystone correction operation is given by the user (NO in step S4).
[0041]
As a result, the image data stored for each frame in the frame buffer 21c is distorted in the
opposite direction to the projected image S1 shown in FIG. 6 (b) as shown in FIG. 6 (c). Data of
the enlarged image G2 is sent to the output image processing circuit 12 and, as a result, it is
corrected on the screen 100 to the same shape as the input image G1 as shown in FIG. The
projected image S2 is projected.
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[0042]
Eventually, when the user instructs to end the keystone correction operation by pressing the
push switch 35 (YES in step S4), the microprocessor 21b corrects the input image G1 currently
being performed by the image processor 21a. Of the projection light L with respect to the
projection screen 100 in the horizontal direction (FIG. 4 (b)), based on the amount (eg, the ratio
of the length of the left side and the right side of the image G2 shown in FIG. (Refer to), ie, the
installation angle of the projector 1 is calculated (step S5).
[0043]
Subsequently, the microprocessor 21b calculates the balance (ratio) of the left and right sounds
based on the calculated installation angle (step S6), and changes the volume of the amplifiers 31
and 32 according to the calculation result (step S7).
In the example described above, the balance of the left and right sounds is 3: 1 or the like, and
the volume of the amplifier 32 on the left side is set larger than that of the amplifier 31 on the
right side.
As a result, the sound amplified by the left speaker 5 with more viewers 200 becomes larger
(three times as large as the right side, etc.). Thereafter, whenever the user performs a keystone
correction operation, the operations of steps S3 to S7 described above are repeated.
[0044]
As described above, in the projector 1 according to the present embodiment, if the user performs
the keystone correction manually while viewing the projection screen at the beginning of use, the
volume balance of the sound amplified from the left and right speakers 4 and 5 Is automatically
set in accordance with the installation angle of the projector 1 at that time. That is, it is possible
to listen to both the viewer 200 closer to the projector 1 and the viewer 200 farther from the
projector 1 with a more appropriate voice. Therefore, the user can automatically secure the
above-mentioned good voice amplification operation only by performing the keystone correction
operation, and can easily perform the preparation work of the presentation.
[0045]
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12
In addition, since the sound accompanying the projection screen can be directly transmitted to
the viewers 200 from the left and right speakers 4 and 5 and the quality of the sound is good,
the viewers 200 can easily hear the sound. As a result, it is possible to cope with speech of wider
frequency characteristics.
[0046]
Moreover, since the installation angle of the projector 1 is acquired based on the correction
amount with respect to the input image G1 by keystone correction, no device such as a distance
sensor is required. The effects described above can be obtained.
[0047]
In the present embodiment, after the end of the keystone correction operation by the user, the
installation angle of the projector 1 is calculated based on the correction amount for the final
input image G1, and the volume of the left and right speakers 4 and 5 is controlled. However, for
example, the calculation of the installation angle and the control of the volume may be
sequentially performed each time the user performs the keystone correction operation.
[0048]
Further, in the present embodiment, the present invention is applied to the projector 1 which
manually performs the keystone correction. However, the present invention is not limited to this,
and the present invention is not limited to this, as described in the prior art. The projector can be
adopted in a projector having a configuration in which the installation angle of the projector is
acquired using the distance sensor of the above, and the keystone correction is automatically
performed based thereon.
In such a case, the processing in steps S6 and S7 described above may be performed using the
information on the installation angle acquired to perform the keystone correction as it is.
Even in this case, the same effect as that of the present embodiment can be obtained.
[0049]
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Further, in the present embodiment, the sound volume balance of the left and right speakers 4
and 5 is electrically controlled, and as a result, the sound amplification direction of the sound
attached to the projection screen is controlled. May be For example, while providing only one
rotatable speaker for expanding voice and providing a rotary volume for the user to electrically
adjust the correction amount of the keystone correction, the operation force (rotational force) is
set to a predetermined value. The power is transmitted to the speaker via a power transmission
mechanism, the direction is changed according to the correction amount of the keystone
correction, or the speaker is driven by a motor, and the direction of the speaker is electrically
controlled by the rotary volume. It may be made to change by the operation of the motor
according to the amount of correction transmitted to.
[0050]
Further, in the present embodiment, the projector 1 performing the sound amplification
operation as an operation having directionality other than the keystone correction has been
described, but the present invention has an operation having another directionality other than
the sound amplification function. It can also be employed for other projectors that do. For
example, the present invention is applied to a projector provided with cooling fans on the left and
right of the main body for the purpose of lowering the internal temperature (cooling) and
performing cooling operation by them, and the rotational speed of each cooling fan according to
the installation angle at the time of use Alternatively, the exhaust direction of the internal air may
be controlled by changing the on / off state.
[0051]
In that case, it is possible to automatically reduce the noise emitted toward the viewer as the
cooling fan rotates. In addition, by reducing the amount of warm air (exhaust) blown out from the
exhaust port of the device body and sent to the viewer, it is also possible to eliminate the
discomfort felt by the viewer. In the configuration in which a single cooling fan is provided in the
main body, the direction of exhausting the internal air can be controlled by changing the
direction of the cooling fan or the exhaust path according to the installation angle at the time of
use of the projector. You may
[0052]
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14
Furthermore, for example, in the projector 1 described above, the respective infrared light
receiving elements constituting the two infrared receivers 33 are in different directions (for
example, the same direction as the sound amplification direction in the left and right speakers 4
and 5 in this embodiment. The present invention is applied to the operation of receiving infrared
light by the two infrared receivers 33 when it has the directivity), and the on / off of each of the
two infrared receivers 33 according to the installation angle at the time of use thereof. The state
may be controlled. Further, in the configuration in which only one infrared receiver 33 is
provided, the infrared light receiving unit is configured to be rotatable, and the direction of the
light receiving unit is set to the installation angle of the projector in the same manner as the
speaker described above. It may be made to change according to. That is, the receiving direction
(communication direction) of infrared light in the projector may be changed according to the
installation angle of the projector.
[0053]
In those cases, the projector 1 is transmitted by infrared rays not only from the image prepared
by the presenter but also from devices such as PDAs and notebook computers brought by a
plurality of viewers who watch the projected image (with or without sound). When the received
image data is received and used for a participatory meeting or the like advanced by projecting
the received image, good reception operation of the sent image data can be automatically
secured. .
[0054]
Also, the present invention is not limited thereto, and in a configuration having two infrared
transmitters for transmitting predetermined data by infrared to external devices instead of the
above-described two infrared receivers 33 or together with the infrared receiver 33, The present
invention may be adopted for the infrared transmission operation of the infrared transmitter, and
the on / off state of each of the two infrared transmitters may be controlled according to the
installation angle at the time of use.
Further, in the configuration in which only one infrared transmission lake is provided, the
infrared light emitting portion is configured to be rotatable, and the direction of the light
emitting portion is set to the installation angle of the projector in the same manner as the
speaker described above. It may be made to change according to. That is, the communication
direction (directivity) which is the direction of transmission and reception of infrared light in the
09-05-2019
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projector may be changed. That is, the transmission direction (communication direction) of
infrared light in the projector may be changed according to the installation angle of the projector.
[0055]
In those cases, in the case where predetermined data is transmitted from the projector 1 to PDAs
brought by a plurality of viewers, it is possible to automatically secure a good data transmission
operation.
[0056]
It is a rear perspective view of the projector which shows one embodiment of the present
invention.
FIG. 1 is an overall block diagram showing a schematic configuration of a projector 1; FIG. 5 is a
block diagram of an input image / voice processing circuit. (A) is a use state diagram which
shows the positional relationship of a projection screen and a projector, (b) is a figure which
shows the installation angle in the same state. It is a flowchart which shows operation |
movement of a projector. It is a figure which shows the method of a keystone correction.
Explanation of sign
[0057]
Reference Signs List 1 projector 4, 5 speaker 7 input cable 11 input image / sound processing
circuit 12 output image processing circuit 13 image conversion device 14 optical device 21
control block 21a image processor 21b microprocessor 21c frame buffer 21d OSD controller 31,
32 amplifier 35 push switch
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