JP2011102847A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of attaining power saving by displaying an image in a drawing area, when necessary, and of displaying an image which is readily recognized by humans in the drawing area, by changing an image processing pattern for an image displayed in the drawing area, according to the distance from the human located close to a screen. <P>SOLUTION: The image forming apparatus 1 includes: a projector 2 for displaying an image in the drawing area 911; a human-detecting sensor 7 for detecting the presence or the absence of humans in first and second detection areas; and control means 8 for controlling the drive of the projector 2 so as to display an image in the drawing area 911, only when the presence of a human is detected in the first detection area or in the second detection area, and for controlling the drive of the projector 2 so as to change an image pattern for the image displayed, in the drawing area 911 between the case where the presence of a human in the first detection area is detected, and the case where the presence of a human in the second detection area is detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

A projector is used as an instrument that projects light onto the surface of an object such as a screen and displays a desired image on a projection surface of the screen. As such a projector, a projector using an optical scanner capable of scanning light one-dimensionally or two-dimensionally is widely known (for example, see Patent Document 1).
In the projector described in Patent Document 1, when the x axis and the y axis that are orthogonal to each other are set, the movable plate having the light reflecting portion rotates around the x axis, and the movable having the light reflecting portion. The plate has a second optical scanner that rotates about the y-axis, and a light source device that emits light such as a laser. In such a projector, the light emitted from the light source device is scanned by the first optical scanner, and the scanned light is further scanned by the second optical scanner, whereby the light is scanned two-dimensionally on the screen. A desired image is displayed.
Here, in recent years, for example, a screen is installed in a street such as a street, a station premises, a building, a hotel lobby, etc., and a desired image (promotion video, CM video, etc.) is displayed on the screen using the projector as described above. By displaying it, advertising / advertising is performed to people around the screen.

However, with the projector described in Patent Document 1, even if an image can be displayed on the screen, it is impossible to grasp the presence of a person looking at the screen (the presence of a person around the screen). For this reason, for example, an image may continue to be displayed on the screen even though there is no person looking at the screen. In other words, the projector disclosed in Patent Document 1 requires a lot of wasted driving (for example, driving in a state in which almost no advertising / advertisement effect is obtained), and power saving (low power consumption) cannot be achieved.
Furthermore, in the projector described in Patent Document 1, even if an image can be displayed on the screen, the image pattern is changed in accordance with the distance from a person located near the screen and viewing the image displayed on the screen. I can't. Therefore, there is a problem that the image that is easily recognized by the human cannot be displayed on the display surface.

JP 2008-116668 A

  An object of the present invention is to save power by displaying an image in a drawing area when necessary, and to display an image displayed in the drawing area according to the distance from a person located near the drawing area. It is an object of the present invention to provide an image forming apparatus capable of displaying an image easily recognized by humans in a drawing area by changing the image processing pattern.

Such an object is achieved by the present invention described below.
An image forming apparatus of the present invention includes a projector configured to display an image by scanning light on a drawing area on which a display surface is formed, and
When the first detection area and the second detection area located outside the drawing area with respect to the first detection area are set, each of the first detection area and the second detection area A human sensor for detecting whether or not a person is present in the area,
When the human sensor detects the presence of a person in the first detection area or the second detection area, the human sensor displays the image in the drawing area, and the human sensor detects the first detection area. When the presence of a person is not detected in any of the area and the second detection area, the projector is controlled so that the image is not displayed in the drawing area, and the human sensor is The image pattern of the image displayed in the drawing area is changed when the presence of a person in the first detection area is detected and when the human sensor detects the person in the second detection area. And a control means for controlling the driving of the projector.

  As a result, it is possible to save power by displaying an image in the drawing area when necessary, and image processing of an image displayed in the drawing area according to the distance from a person located near the drawing area. By changing the pattern, it is possible to provide an image forming apparatus capable of displaying an image that can be easily recognized by humans in a drawing area. Therefore, an excellent advertising function can be exhibited particularly when the image is an advertisement such as a commercial or a promotion video.

In the image forming apparatus of the present invention, the projector includes a light emitting unit that emits a laser,
A movable plate provided with a light reflecting portion for reflecting the laser emitted from the light emitting portion is provided so as to be rotatable in at least one direction or two directions orthogonal to each other, and the laser reflected by the light reflecting portion by the rotation It is preferable to have an optical scanner that scans the drawing area.
Thereby, the configuration of the projector becomes relatively simple.
In the image forming apparatus according to the aspect of the invention, the controller emits the light when the human sensor does not detect the presence of a person in any of the first detection area and the second detection area. It is preferable to stop the emission of laser from the part.
Thereby, it is possible to further reduce the power consumption of the image forming apparatus.

In the image forming apparatus of the present invention, the projector has speckle reduction processing means for reducing the speckle of the laser,
The control means performs the speckle reduction processing of the laser by the speckle reduction treatment means when the human sensor detects the presence of a person in the first detection area, and the human sensor When the presence of a person in the second detection area is detected, it is preferable to control the drive of the projector so that the speckle reduction processing unit does not perform the speckle reduction processing of the laser.

  As a result, attention can be focused on the image displayed in the drawing area, and an image that is easier to see can be provided to a person who has approached the drawing area. In other words, it is possible to make more people recognize the image displayed in the drawing area by properly using the image shifted to be more conspicuous than the visibility and the image shifted to easier to see than the visibility. it can. Therefore, particularly when the image displayed in the drawing area is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

In the image forming apparatus according to the aspect of the invention, when the human sensor detects the presence of a human in the first detection area, the controller detects the human in the second detection area. It is preferable to control the driving of the projector so that the brightness of the image displayed in the drawing area is lower than when the presence of the image is detected.
As a result, attention can be focused on the image displayed in the drawing area, and an image that is easier to see can be provided to a person who has approached the drawing area. In other words, it is possible to make more people recognize the image displayed in the drawing area by properly using the image shifted to be more conspicuous than the visibility and the image shifted to easier to see than the visibility. it can. Therefore, particularly when the image displayed in the drawing area is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

In the image forming apparatus according to the aspect of the invention, when the human sensor detects the presence of a human in the first detection area, the controller detects the human in the second detection area. It is preferable to control the driving of the projector so that the size of the characters displayed in the drawing area is smaller than when the presence of is detected.
As a result, it is possible for a person observing the drawing area to recognize the image (character) displayed in the drawing area without a sense of incongruity. Therefore, particularly when the image displayed in the drawing area is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

In the image forming apparatus according to the aspect of the invention, when the human sensor detects the presence of a person in both the first detection area and the second detection area, the control unit includes the first detection area. It is preferable to control the projector so that an image pattern corresponding to a person existing in the detection area is displayed in the drawing area.
As a result, an image that can be easily recognized by a person close to the drawing area (a person located in the first detection area) can be displayed in the drawing area. Because people who are closer to the drawing area are more likely to be interested in (or more likely to be interested in) the images displayed in the drawing area, they have better advertising effects. be able to.

In the image forming apparatus according to the aspect of the invention, when the human sensor detects the presence of a human in both the first detection area and the second detection area, the control unit includes the second detection area. It is preferable to control the projector so that an image pattern corresponding to a person existing in the detection area is displayed in the drawing area.
As a result, a person who is far from the drawing area (a person located in the second detection area) is strongly impressed and interested in the image displayed in the drawing area, and a person close to the drawing area (the first detection area). An image displayed in the drawing area can also be recognized by a person located inside. Therefore, it is possible to exert an excellent advertising effect.

In the image forming apparatus according to the aspect of the invention, it is preferable that the drawing area is formed in the vicinity of the projector, and the projector displays an image in the drawing area by proximity projection.
Thereby, since the optical path length of the light emitted from the projector can be shortened, the light can be scanned more reliably at a desired position in the drawing area. In addition, the light emitted from the projector can be prevented from being blocked by, for example, a pedestrian, so that a desired image can be displayed in the drawing area without being affected by the surrounding environment (population density, etc.). Can do.

In the image forming apparatus according to the aspect of the invention, it is preferable that the projector displays an image that can be recognized from a position far from the drawing area of the second detection area in the drawing area.
As a result, all persons located in the detection area can recognize the contents of the image displayed in the drawing area.
In the image forming apparatus according to the aspect of the invention, it is preferable that the drawing area is set in the first detection area.
This makes it possible to reliably detect the presence of a person near the drawing area without overlooking it.

In the image forming apparatus according to the aspect of the invention, it is preferable that the projector includes a distortion correction unit that corrects distortion of an image displayed in the drawing area.
Thereby, an image in which distortion is corrected can be displayed in the drawing area.
In the image forming apparatus according to the aspect of the invention, it is preferable that the projector is provided on the lower side in the vertical direction with respect to the drawing area.
Thereby, it becomes easy to adjust the amount of external light applied to the drawing region.

In the image forming apparatus of the present invention, the display surface is a surface of a wall,
The drawing region is preferably formed on the surface of the wall.
This improves the convenience of the image forming apparatus.
In the image forming apparatus of the present invention, the display surface is a floor surface or a ceiling surface,
It is preferable that the drawing area is formed on the surface of the floor or the surface of the ceiling.
This improves the convenience of the image forming apparatus.

In the image forming apparatus of the present invention, the display surface is a wall surface and a floor surface,
The drawing area is preferably formed across the surface of the wall and the surface of the floor.
This improves the convenience of the image forming apparatus.
In the image forming apparatus of the present invention, the display surface is a wall surface and a ceiling surface,
The drawing area is preferably formed across the surface of the wall and the surface of the ceiling.
This improves the convenience of the image forming apparatus.
In the image forming apparatus of the present invention, the display surface is a surface of a screen,
It is preferable that the drawing area is formed on the surface of the screen.
Thereby, the visibility of an image improves.

1 is a diagram illustrating a first embodiment of an image forming apparatus of the present invention. FIG. 2 is a block diagram of the image forming apparatus illustrated in FIG. 1. It is a block diagram of the projector shown in FIG. FIG. 4 is a partial cross-sectional perspective view of the optical scanner shown in FIG. 3. FIG. 5 is a cross-sectional view illustrating driving of the optical scanner shown in FIG. 4. It is a block diagram which shows the distortion correction means, the optical scanning part, and light source unit of the projector shown in FIG. FIG. 4 is a diagram (a is a side view, and b is a front view) for explaining the operation of the projector shown in FIG. 3. 4 is a graph showing a deflection angle (a change with time of the deflection angle) of the movable plate of the optical scanner (horizontal scanning optical scanner) during operation of the projector shown in FIG. 3. FIG. 4 is a graph showing an angle (change in angle with time) of a movable plate of an optical scanner (optical scanner for vertical scanning) during operation of the projector shown in FIG. 3. It is a figure (a is a side view and b is a front view) which shows the modification of the projector shown in FIG. 3, and its operation | movement. It is a figure which shows the detection area | region of the human sensitive sensor shown in FIG. It is a figure which shows 2nd Embodiment of the image forming apparatus of this invention. It is a figure which shows 3rd Embodiment of the image forming apparatus of this invention. It is a figure which shows the modification of 3rd Embodiment of the image forming apparatus of this invention. It is a figure which shows 4th Embodiment of the image forming apparatus of this invention. It is a figure which shows the modification of 4th Embodiment of the image forming apparatus of this invention. It is a figure which shows 5th Embodiment of the image forming apparatus of this invention. It is a figure which shows the modification of 5th Embodiment of the image forming apparatus of this invention. It is a figure which shows 6th Embodiment of the image forming apparatus of this invention. It is a figure which shows the modification of 6th Embodiment of the image forming apparatus of this invention. It is a typical plane which shows the optical scanner which the projector with which the image forming apparatus which concerns on 2nd Embodiment of this invention is provided has. It is the BB sectional view taken on the line in FIG. It is a block diagram which shows the voltage application means of the drive means with which the optical scanner shown in FIG. 21 is provided. It is a figure which shows an example of the voltage which generate | occur | produces in the 1st voltage generation part shown in FIG. 23, and a 2nd voltage generation part. FIG. 16 is a diagram (a is a side view, and b is a front view) for explaining an operation of a projector included in an image forming apparatus according to a seventh embodiment of the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an image forming apparatus of the invention will be described with reference to the accompanying drawings.
<First Embodiment>
1 is a diagram illustrating a first embodiment of an image forming apparatus according to the present invention, FIG. 2 is a block diagram of the image forming apparatus illustrated in FIG. 1, FIG. 3 is a configuration diagram of a projector illustrated in FIG. 2, and FIG. 3 is a partial sectional perspective view of the optical scanner shown in FIG. 3, FIG. 5 is a sectional view for explaining driving of the optical scanner shown in FIG. 4, and FIG. 6 is a distortion correcting means, an optical scanning unit and a light source of the projector shown in FIG. FIG. 7 is a block diagram showing the unit, FIG. 7 is a diagram for explaining the operation of the projector shown in FIG. 3 (a is a side view, b is a front view), and FIG. 8 is in operation of the projector shown in FIG. FIG. 9 is a graph showing the deflection angle (change of the deflection angle with time) of the movable plate of the optical scanner (horizontal scanning optical scanner). FIG. 9 is an optical scanner (vertical scanning optical scanner) during operation of the projector shown in FIG. ) Movable plate angle (change in angle over time) 10 is a graph showing a modification of the projector shown in FIG. 3 and its operation (a is a side view, b is a front view), and FIG. 11 is a detection of the human sensor shown in FIG. It is a figure which shows an area | region. In the following, for convenience of explanation, the upper side in FIGS. 4, 5, 7, and 10 is referred to as “upper”, the lower side as “lower”, the right side as “right”, and the left side as “left”.

  The image forming apparatus 1 shown in FIG. 1 includes a still image on a drawing area 911 formed on a display surface (front surface) 91 of a screen 9 installed on a wall W of a building such as a station premises, a building, or a hotel. And a predetermined image such as a moving image (particularly a commercial or a promotional video). In this way, by displaying an image in the drawing area 911 only when necessary, it is possible to save power in the image forming apparatus 1.

  Thus, in this embodiment, since the image is displayed in the drawing area 911, the visibility of the image is improved. The constituent material of the screen 9 is not particularly limited, and for example, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, acrylic resin, ABS resin, fluorine resin, epoxy resin, silicone resin, or these are mainly used. Copolymers, blends, polymer alloys and the like can be mentioned, and one or more of these can be used in combination.

  As shown in FIG. 2, the image forming apparatus 1 includes a projector 2 that scans light in a drawing area 911 and draws an image, a human sensor 7 that detects the presence or absence of a human near the screen 9, and a human sensor 7 and a control means 8 for controlling the driving of the projector 2 based on the detection result 7. Further, the image forming apparatus 1 includes a housing 11, and the projector 2, the human sensor 7, and the control unit 8 are accommodated in the housing 11. Such an image forming apparatus 1 is configured to display an image in the drawing area 911 only when a person is present near the screen 9.

As shown in FIG. 3, the projector 2 includes a light source unit (light emitting unit) 3 that emits light, a light scanning unit 4 that scans light emitted from the light source unit 3 with respect to the display surface 91, and a display surface 91. And a distortion correction means 5 that corrects distortion (trapezoid correction) of the image displayed on the screen, and a speckle reduction processing means (operation control device) 6 that reduces the speckle of light.
The light source unit 3 includes laser light sources 31r, 31g, and 31b for the respective colors, collimator lenses 32r, 32g, and 32b and dichroic mirrors 33r, 33g, and 33b provided corresponding to the laser light sources 31r, 31g, and 31b for the respective colors. I have.

  Further, as shown in FIG. 6, the laser light sources 31r, 31g, and 31b for the respective colors have drive circuits 310r, 310g, and 310b, a red light source 320r, a green light source 320g, and a blue light source 320b, respectively. As shown in FIG. 3, red, green, and blue laser beams RR, GG, and BB are emitted. The laser beams RR, GG, and BB are emitted in a modulated state corresponding to drive signals transmitted from a light source modulation unit 54 (to be described later) of the distortion correction unit 5, and collimator lenses 32r that are collimating optical elements, respectively. The beams are collimated by 32g and 32b to form a thin beam.

The dichroic mirrors 33r, 33g, and 33b have characteristics of reflecting the red laser beam RR, the green laser beam GG, and the blue laser beam BB, respectively, and combine the laser beams RR, GG, and BB of the respective colors into one laser beam. (Light) LL is emitted.
A collimator mirror can be used in place of the collimator lenses 32r, 32g, and 32b. In this case as well, a narrow beam of parallel light beams can be formed. Further, when parallel light beams are emitted from the laser light sources 31r, 31g, and 31b of the respective colors, the collimator lenses 32r, 32g, and 32b can be omitted. Further, the laser light sources 31r, 31g, and 31b can be replaced with light sources such as light emitting diodes that generate similar light beams.

  Further, the order of the laser light sources 31r, 31g, and 31b, the collimator lenses 32r, 32g, and 32b, and the dichroic mirrors 33r, 33g, and 33b in FIG. 3 is merely an example, and combinations of the colors (red indicates the laser light source 31r). , Collimator lens 32r, dichroic mirror 33r, green is laser light source 31g, collimator lens 32g, dichroic mirror 33g, blue is laser light source 31b, collimator lens 32b, dichroic mirror 33b) and the order is freely set it can. For example, a combination of blue, red, and green is also possible in the order closer to the optical scanning unit 4.

Next, the optical scanning unit 4 will be described.
The optical scanning unit 4 scans the drawing region 911 with the laser light LL emitted from the light source unit 3 in the horizontal direction (first direction) (horizontal scanning: main scanning) and is slower than the scanning speed in the horizontal direction. Two-dimensional scanning is performed by scanning (vertical scanning: sub-scanning) in the vertical direction (second direction orthogonal to the first direction) at the scanning speed.

  The optical scanning unit 4 includes an optical scanner (first direction scanning unit) 41 that is a horizontal scanning mirror that scans the drawing region 911 in the horizontal direction with the laser light LL emitted from the light source unit 3, and the optical scanner 41. The angle detection means (behavior detection means) 43 for detecting the angle (behavior) of the movable plate 411a, which will be described later, and the vertical scanning mirror for scanning the laser light LL emitted from the light source unit 3 in the vertical direction with respect to the drawing region 911. And an angle detection means (behavior detection means) 44 for detecting an angle (behavior) of a movable plate 421a (to be described later) of the optical scanner 42.

Hereinafter, the configuration of the optical scanners 41 and 42 will be described. Since the optical scanners 41 and 42 have the same configuration, the optical scanner 41 will be described below as a representative, and the optical scanner 42 will be described. Omitted.
As shown in FIG. 4, the optical scanner 41 is a so-called one-degree-of-freedom vibration system, and includes a base 411, a counter substrate 413 provided to face the lower surface of the base 411, a base 411, a counter substrate 413, and the like. And a spacer member 412 provided therebetween.

The base 411 includes a movable plate 411a, a support portion 411b that rotatably supports the movable plate 411a, and a pair of connecting portions 411c and 411d that connect the movable plate 411a and the support portion 411b.
The movable plate 411a has a substantially rectangular shape in plan view. On the upper surface of the movable plate 411a, a light reflecting portion (mirror) 411e having light reflectivity is provided. The surface (upper surface) of the light reflecting portion 411e constitutes a reflecting surface that reflects light. The light reflecting portion 411e is made of a metal film such as Al or Ni, for example. A permanent magnet 414 is provided on the lower surface of the movable plate 411a.
The support portion 411b is provided so as to surround the outer periphery of the movable plate 411a in a plan view of the movable plate 411a. That is, the support part 411b has a frame shape, and the movable plate 411a is located inside thereof.

The connecting portion 411c connects the movable plate 411a and the support portion 411b on the left side of the movable plate 411a, and the connecting portion 411d connects the movable plate 411a and the support portion 411b on the right side of the movable plate 411a. Yes.
Each of the connecting portions 411c and 411d has a longitudinal shape. Further, each of the connecting portions 411c and 411d can be elastically deformed. The pair of connecting portions 411c and 411d are provided coaxially with each other, and the movable plate 411a is located with respect to the support portion 411b around this axis (hereinafter referred to as “rotation center axis J1”). Rotate.

  Such a base 411 is made of, for example, silicon as a main material, and a movable plate 411a, a support portion 411b, and connection portions 411c and 411d are integrally formed. As described above, by using silicon as a main material, it is possible to realize excellent rotation characteristics and to exhibit excellent durability. Further, fine processing (processing) is possible, and the optical scanner 41 can be downsized.

The spacer member 412 has a frame shape, and its upper surface is joined to the lower surface of the base 411. The spacer member 412 is substantially equal to the shape of the support portion 411b in the plan view of the movable plate 411a. Such a spacer member 412 is made of, for example, various glasses, various ceramics, silicon, SiO ₂ or the like.
The method for joining the spacer member 412 and the base 411 is not particularly limited. For example, the spacer member 412 may be joined via another member such as an adhesive, or anodic joining may be performed depending on the constituent material of the spacer member 412. It may be used.

Similar to the spacer member 412, the counter substrate 413 is made of, for example, various kinds of glass, silicon, SiO ₂ or the like. A coil 415 is provided on the upper surface of the counter substrate 413 and on a portion facing the movable plate 411a.
The permanent magnet 414 has a plate bar shape and is provided along the lower surface of the movable plate 411a. Such a permanent magnet 414 is magnetized (magnetized) in a direction orthogonal to the rotation center axis J1 in a plan view of the movable plate 411a. That is, the permanent magnet 414 is provided such that a line segment connecting both poles (S pole and N pole) is orthogonal to the rotation center axis J1.
The permanent magnet 414 is not particularly limited, and for example, a neodymium magnet, a ferrite magnet, a samarium cobalt magnet, an alnico magnet, or the like can be used.

The coil 415 is provided so as to surround the outer periphery of the permanent magnet 414 in the plan view of the movable plate 411a.
Further, the optical scanner 41 includes a voltage applying unit 416 that applies a voltage to the coil 415. The voltage application unit 416 is configured to be able to adjust (change) each condition such as the voltage value and frequency of the voltage to be applied. The voltage applying unit 416, the coil 415, and the permanent magnet 414 constitute a driving unit 417 that rotates the movable plate 411a.

A predetermined voltage is applied from the voltage applying unit 416 to the coil 415 under the control of the distortion correcting unit 5, and a predetermined current flows.
For example, when an alternating voltage is applied from the voltage application unit 416 to the coil 415 under the control of the distortion correction unit 5, a current flows accordingly, and a magnetic field in the thickness direction of the movable plate 411a (up and down direction in FIG. 4) is generated. And the direction of the magnetic field is periodically switched. That is, the state A in which the vicinity of the upper side of the coil 415 is the S pole and the vicinity of the lower side is the N pole, and the state B in which the vicinity of the upper side of the coil 415 is the N pole and the vicinity of the lower side is alternately switched.

In the state A, as shown in FIG. 5A, the right side of the permanent magnet 414 is displaced upward by the repulsive force with the magnetic field generated by energizing the coil 415, and the left side of the permanent magnet 414 is the magnetic field. It is displaced downward by the suction force. Thereby, the movable plate 411a is rotated counterclockwise and tilted.
On the contrary, in the state B, as shown in FIG. 5B, the right side of the permanent magnet 414 is displaced downward and the left side of the permanent magnet 414 is displaced upward. Thereby, the movable plate 411a rotates clockwise and tilts.
By alternately repeating the state A and the state B, the movable plate 411a rotates (vibrates) around the rotation center axis J1 while twisting and deforming the connecting portions 411c and 411d.

Further, the current flowing can be adjusted by adjusting the voltage applied from the voltage applying unit 416 to the coil 415 under the control of the distortion correcting unit 5, whereby the movable plate 411 a (the reflecting surface of the light reflecting portion 411 e). The swing angle (amplitude) about the rotation center axis J1 can be adjusted.
The configuration of such an optical scanner 41 is not particularly limited as long as the movable plate 411a can be rotated. For example, the drive system is replaced with electromagnetic drive using a coil 415 and a permanent magnet 414. For example, piezoelectric driving using a piezoelectric element or electrostatic driving using electrostatic attraction may be used.

  As shown in FIG. 3, the optical scanners 41 and 42 having the above-described configuration are provided so that the rotation center axes J1 and J2 are orthogonal to each other. By providing the optical scanners 41 and 42 in this way, the laser light LL emitted from the light source unit 3 can be scanned two-dimensionally (in two directions orthogonal to each other) with respect to the drawing region 911. Thereby, a two-dimensional image can be drawn in the drawing area 911 with a relatively simple configuration.

  More specifically, the light emitted from the light source unit 3 is reflected by the reflecting surface of the light reflecting portion 411e of the light scanner 41, and then reflected by the reflecting surface of the light reflecting portion 421e of the light scanner 42, and the screen 9 Is projected (irradiated) onto the drawing area 911. The laser beam LL emitted from the light source unit 3 is rotated by rotating the light reflecting portion 411e of the optical scanner 41 and rotating the light reflecting portion 421e of the optical scanner 42 at an angular velocity slower than the angular velocity (speed). Is scanned in the horizontal direction with respect to the drawing region 911 and in the vertical direction at a scanning speed slower than the scanning speed in the horizontal direction. Thereby, the laser beam LL emitted from the light source unit 3 is scanned two-dimensionally with respect to the drawing area 911, and an image is drawn in the drawing area 911.

Here, in order to rotate the light reflecting portion 421e of the optical scanner 42 at an angular velocity slower than the angular velocity of the light reflecting portion 411e of the optical scanner 41, for example, the optical scanner 41 is set to resonance driving using resonance, and the optical scanner 42 is used. Is preferably non-resonant driving without using resonance.
The light emitted from the light source unit 3 may be reflected first by the light reflecting portion 421e of the light scanner 42 and then reflected by the light reflecting portion 411e of the light scanner 41. That is, it may be configured such that the vertical scanning is performed first and then the horizontal scanning is performed.

Next, the angle detection unit 43 that detects the angle of the movable plate 411a of the optical scanner 41 will be described. Note that the angle detection unit 44 that detects the angle of the movable plate 421a of the optical scanner 42 has the same configuration as the angle detection unit 43, and thus description thereof is omitted.
As shown in FIG. 4, the angle detection means 43 includes a piezoelectric element 431 provided on the connecting portion 411 c of the optical scanner 41, an electromotive force detection unit 432 that detects an electromotive force generated from the piezoelectric element 431, and an electromotive force. And an angle detection unit 433 that obtains an angle of the movable plate 411a based on the detection result of the detection unit 432 (detects the behavior).

  When the connecting portion 411c is torsionally deformed with the rotation of the movable plate 411a, the piezoelectric element 431 is deformed accordingly. When the piezoelectric element 431 is deformed from a natural state to which no external force is applied, the piezoelectric element 431 has a property of generating an electromotive force having a magnitude corresponding to the amount of deformation. Therefore, the angle detection unit 433 includes the electromotive force detection unit 432. Based on the magnitude of the electromotive force detected in step 1, the degree of twist of the connecting portion 411c is obtained, and the angle of the movable plate 411a (the reflection surface of the light reflecting portion 411e) is obtained from the degree of twist. In addition, the angle detection unit 433 obtains a deflection angle around the rotation center axis J1 of the movable plate 411a. A signal including information on the angle and deflection angle of the movable plate 411 a is transmitted from the angle detection unit 433 to the distortion correction unit 5.

The angle of the movable plate 411a to be detected may be set to an angle when any state of the optical scanner 41 is used as a reference (angle is 0 °). For example, the initial state of the optical scanner 41 ( It is possible to set the angle when the reference (angle is 0 °) when the voltage is not applied to the coil 415.
Further, the detection of the angle of the movable plate 411a may be performed in real time (continuously) or may be performed intermittently. Further, the angle detection unit 43 is not limited to the one using the piezoelectric element as in the present embodiment as long as the angle of the movable plate 411a can be detected.

Next, the speckle reduction processing means 6 will be described.
Here, since the projector 2 uses a laser light source (light source 320r, 320g, 320b) having high coherence as the light source, so-called “speckle noise” is generated in the image displayed in the drawing area 911. The speckle noise is generated when the laser beams LL diffused at each point in the drawing region 911 interfere with each other at random when the laser beams LL are diffused in the drawing region 911. An image in which speckle noise has occurred gives a viewer a glare and glimmer.
The speckle reduction processing means 6 has a function of reducing (preferably removing) such speckle noise. That is, the speckle reduction processing means 6 makes the image displayed in the drawing area 911 a clear image without flickering.

  As shown in FIG. 3, the speckle reduction processing unit 6 has three high-frequency current superimposing units 6r, 6g, and 6b. The high frequency current superimposing means 6r has a function of superimposing a high frequency current on a laser drive signal (current) applied to the light source 320r from the drive circuit 310r. Similarly, the high frequency current superimposing means 6g has a function of superimposing a high frequency current on the laser drive signal applied from the drive circuit 310g to the light source 320g, and the high frequency current superimposing means 6b is connected to the light source 320b from the drive circuit 310b. It has a function of superimposing a high-frequency current on the laser drive signal applied to.

  The laser light RR emitted from the light source 320r by the laser drive signal on which the high frequency is superimposed by the high frequency current superimposing means 6r is wider than that in the case where the high frequency is not superimposed. Ease). The same applies to the high-frequency current superimposing means 6g and 6b. Thereby, speckle noise of the image displayed in the drawing area 911 is reduced.

Next, the distortion correction means (operation control device) 5 will be described.
In the projector 2, when an image is displayed (drawn) in the drawing area 911 using the pair of optical scanners 41 and 42 as described above, distortion caused by an optical path difference to the drawing area 911, for example, the drawing area 911 is displayed. Distortion called “trapezoidal distortion” occurs in which the length in the horizontal direction (horizontal direction) differs between the upper side and the lower side of the displayed image. The distortion correction means 5 has a function of correcting such image distortion.

  As shown in FIG. 6, the distortion correction unit 5 includes a video data storage unit (video data storage unit) 51 that stores video data (image data) used when drawing an image, a video data calculation unit 52, A drawing timing generation unit 53, a light source modulation unit (light modulation unit) 54, a deflection angle calculation unit (amplitude calculation unit) 55, an angle instruction unit 56, and a calibration curve storage unit (a calibration curve storage unit) that stores a calibration curve 57).

The projector 2 performs vertical scanning (hereinafter, also simply referred to as “vertical scanning”) in each of the forward path and the backward path. The image is displayed (drawn) in the drawing area 911 by performing each of the forward pass and the return pass.
Further, when performing horizontal scanning, the projector 2 in the horizontal direction of the laser light LL on the drawing region 911 in a light emission state in which the laser light LL is emitted from the light source unit 3 (hereinafter also simply referred to as “light emission state”). Of the movable plate 411a (hereinafter, also simply referred to as “the width of the laser beam (light) LL”) is a swing angle around the rotation center axis J1 of the movable plate 411a (hereinafter, simply “the swing angle of the movable plate 411a”). In other words, the swing angle of the movable plate 411a is adjusted so as to be aligned in the vertical direction as compared with the case where the adjustment (adjustment by the adjusting means) is not performed. In particular, it is preferable to adjust the deflection angle of the movable plate 411a so that the deflection width of the laser beam LL is constant along the vertical direction in the light emission state. As a result, it is possible to prevent the trapezoidal distortion of the image while increasing the time aperture ratio. In the present embodiment, a description will be given of a case where the deflection width is typically adjusted to be constant along the vertical direction.

  The deflection width is the position of the laser beam LL on the same plane as the drawing region 911 when the movable plate 411a is rotated clockwise (predetermined direction) to the maximum angle in the light emission state, and subsequently. The horizontal distance (interval) between the drawing area 911 and the position of the laser beam LL on the same plane when the movable plate 411a rotates counterclockwise (in the opposite direction) to the maximum angle, 7, when the laser beam LL is two-dimensionally scanned on the drawing region 911 in the light emitting state, a plurality of drawing lines (scanning lines) that are the locus of the laser beam LL on the drawing region 911 are obtained. The horizontal length of each L.

  As shown in FIG. 7, the plurality of drawing lines L are arranged in a zigzag manner. Of each drawing line L, the left end portion and the right end portion each have a small angular velocity (speed) of the light reflecting portion 411e of the optical scanner 41, and are not suitable for drawing. For this reason, a drawing area (display area) 911 which is an area for drawing (displaying) an image is set except for the left end and the right end. The drawing area 911 is set so as to form a rectangle (including a square), for example.

  When the deflection angle of the movable plate 411a of the optical scanner 41 is constant, the deflection width of the laser beam LL in the light emission state changes according to the angle of the movable plate 421a of the optical scanner 42, and the laser beam LL scans. The position in the vertical direction on the drawing area 911 (the position in the vertical direction of the drawing line L) becomes longer as the distance from the projector 2 increases. Therefore, in the projector 2, the deflection angle of the movable plate 411a is adjusted according to the angle of the movable plate 421a. That is, light emission is achieved by reducing the deflection angle of the movable plate 411a as the vertical position (the vertical position of the drawing line L) on the drawing area 911 scanned with the laser light LL is farther from the projector 2. The fluctuation width of the laser beam LL in the state is made constant along the vertical direction.

  The calibration curve storage unit 57 stores the vertical position (drawing line) of the laser beam LL to be scanned in the drawing region 911 in the light emission state, where the fluctuation width of the laser beam LL is constant along the vertical direction. A calibration curve such as a table or an arithmetic expression (function) indicating the relationship between the vertical position of L) and the deflection angle of the movable plate 411a is stored (stored). When drawing an image, the calibration curve is used to obtain a target value (target shake angle) of the shake angle based on the vertical position on the drawing area 911 of the laser beam LL that scans the drawing area 911. The calibration curve can be obtained by calculation and is stored in advance in the calibration curve storage unit 57.

  In the projector 2, in the drawing area 911, the vertical intervals between the adjacent drawing lines L are constant for the odd-numbered drawing lines L from the upper side, and similarly, the even-numbered drawing lines from the upper side. For L, it is preferable to adjust the angle and angular velocity of the movable plate 421a so that the vertical interval between adjacent drawing lines L is constant. Thereby, the distortion of the image in the vertical direction can be prevented.

  In the present embodiment, for example, at the left end and the right end of the drawing area 911 at the start of drawing of each drawing line L, the vertical spacing between adjacent drawing lines L is constant. The angle of the movable plate 421a is adjusted, and the angular velocity of the movable plate 421a is set to a predetermined value. That is, for each drawing line L, the angle of the movable plate 421a is adjusted so that the vertical interval between adjacent drawing start points is constant, and the angular velocity of the movable plate 421a is set to a constant value for each drawing line L. To do. Note that the angular velocity of the movable plate 421a is set to be smaller as the vertical position of the drawing line L is farther from the projector 2. Thereby, it is possible to prevent distortion of the image in the vertical direction with relatively simple control.

Next, the operation (action) of the projector 2 when drawing an image on the drawing area 911 of the screen 9 will be described.
First, video data is input to the projector 2. The input video data is temporarily stored in the video data storage unit 51, read from the video data storage unit 51, and an image is drawn using the video data. In this case, drawing of the image may be started after all of the video data is stored in the video data storage unit 51, and after part of the video data is stored in the video data storage unit 51, Drawing may be started, and the video data storage unit 51 may store the video data that follows the drawing of the image.

  When drawing an image after a part of the video data is stored in the video data storage unit 51, first, video data of at least one frame, preferably two frames or more (for example, two frames). Is stored in the video data storage unit 51, and then image drawing is started. This is because the projector 2 draws an image by performing horizontal scanning in each of the forward and backward passes of the vertical scanning (hereinafter, also simply referred to as “reciprocating drawing in the vertical direction”). The drawing order of the video data from the video data storage unit 51 is reversed between when the image is drawn in the forward pass and when the image is drawn in the return pass of the vertical scan, so that the drawing of the image is started in the return pass of the vertical scan. This is because, in order to read the video data from the opposite side, at least one frame of video data used for drawing an image on the return path needs to be stored in the video data storage unit 51.

The drawing timing generation unit 53 generates drawing timing information and drawing line information, respectively. The drawing timing information is sent to the video data calculation unit 52, and the drawing line information is sent to the deflection angle calculation unit 55.
The drawing timing information includes drawing timing information and the like. Further, the drawing line information includes information on the vertical position (angle of the movable plate 421a) of the drawing line L for drawing. Note that the position of any part of the drawing line L may be set as the position in the vertical direction of the drawing line L, and examples include the left end, the right end, and the center.
Based on the drawing timing information input from the drawing timing generation unit 53, the video data calculation unit 52 reads the video data corresponding to the pixel to be drawn from the video data storage unit 51, performs various correction calculations, and the like. The luminance data of each color is sent to the light source modulator 54.

The light source modulation unit 54 modulates each light source 320r, 320g, 320b via each drive circuit 310r, 310g, 310b based on the luminance data of each color input from the video data calculation unit 52. That is, the light sources 320r, 320g, and 320b are turned on / off, the output is adjusted (increased / decreased), and the like.
Here, as described above, each high frequency current superimposing means is applied to the laser drive signal applied to each light source 320r, 320g, 320b from each drive circuit 310r, 310g, 310b based on the drive signal from the light source modulator 54. A high frequency current can be superimposed by 6r, 6g, and 6b.

  The angle detection unit 43 on the optical scanner 41 side detects the angle and the swing angle of the movable plate 411 a, and draws the information on the angle and the swing angle (angle information of the movable plate 411 a) in the drawing timing generation unit 53 of the distortion correction unit 5. And sent to the deflection angle calculation unit 55. Further, the angle detector 44 on the optical scanner 42 side detects the angle of the movable plate 421 a, and sends information on the angle (angle information of the movable plate 421 a) to the angle instruction unit 56 of the distortion correction unit 5.

  When the drawing of the current drawing line L is completed and information on the deflection angle of the movable plate 411a is input from the angle detection unit 43, the drawing timing generation unit 53 synchronizes with the angle indication unit 56 and then Target angle information (angle instruction) indicating the target angle of the movable plate 421a when the laser beam LL is irradiated to the drawing start point of the drawing line L for drawing is sent. The target angle of the movable plate 421a is set so that the vertical interval between adjacent drawing start points is constant. The angle instruction unit 56 compares the angle of the movable plate 421a detected by the angle detection unit 44 with the target angle of the movable plate 421a and performs correction so that the difference becomes zero. Drive data is sent to the drive means 427.

The driving unit 427 drives the optical scanner 42 based on the driving data (applies a voltage to the coil). Thereby, when the laser beam LL is irradiated to the drawing start point, the angle of the movable plate 421a becomes the target angle.
In the present embodiment, in each drawing line L, the angular velocity of the movable plate 421a may be constant from the drawing start point to the drawing end point, and the vertical scanning speed of the laser light LL may be constant. The angular velocity of 421a may be gradually changed, and the scanning speed of the laser beam LL in the vertical direction may be gradually changed.
In addition, the drawing timing generation unit 53 sends drawing line information, that is, information on the position in the vertical direction of the drawing line L to be drawn next, to the deflection angle calculation unit 55.

  The deflection angle calculation unit 55 uses the calibration curve read from the calibration curve storage unit 57 and based on the vertical position information of the drawing line L to be drawn next input from the drawing timing generation unit 53. Next, the target deflection angle of the movable plate 411a in the drawing line L for drawing is obtained. Then, based on the information on the deflection angle of the movable plate 411a input from the angle detection means 43 and the target deflection angle of the movable plate 411a, the optical scanner is configured so that the deflection angle of the movable plate 411a becomes the target deflection angle. Drive data is sent to 41 drive means 417.

  Based on the driving data, the driving unit 417 applies an effective voltage having the same frequency as the resonance frequency of the optical scanner 41 to the coil 415 to cause a current to flow to generate a predetermined magnetic field. By changing the phase difference between 41 and the drive waveform, energy is supplied to the optical scanner 41, and conversely, energy is taken from the optical scanner 41. As a result, the deflection angle of the movable plate 411a that is in resonance is the target deflection angle. In this way, based on the information (detection result) of the deflection angle of the movable plate 411a detected by the angle detection means 43 and the target deflection angle (target value), the deflection angle of the movable plate 411a is the target deflection angle. The laser beam LL is sequentially scanned on each drawing line L in the drawing area 911 while adjusting the deflection angle of the movable plate 411a so as to draw an image.

  In addition, the drawing timing generation unit 53 manages whether a frame to be drawn is an odd frame (odd number frame) or an even frame (even number frame), so that the movable plate 421a The rotation direction (movement direction) and the reading order of the video data from the video data storage unit 51 are determined. That is, the video data reading order is reversed between when an image is drawn in an odd frame (vertical scanning forward path) and when an image is drawn in an even frame (vertical scanning backward path).

Further, the laser beam LL is scanned on the same line in the drawing area 911 in the odd frame and the even frame. In other words, the laser beam LL is scanned so that each drawing line L in the odd frame matches each drawing line L in the even frame.
Specifically, for example, as shown in FIG. 8, for the first frame (odd-numbered frame), the drawing starts from the upper left, draws to the lower right zigzag, and the second frame (even-numbered frame) For the frame), the direction of rotation of the movable plate 421a is reversed, and drawing is performed from the lower right to the upper left in the opposite direction. Thereafter, similarly, the odd-numbered frame is drawn from the upper left to the lower right, and the even-numbered frame is drawn from the lower right to the upper left.

In this embodiment, the vertical scanning forward path is an odd frame and the vertical scanning backward path is an even frame. However, the present invention is not limited to this, and the vertical scanning backward path is an odd frame. The scanning forward path may be an even frame.
In the present embodiment, the drawing start position for the first frame is at the upper left, but is not limited thereto, and may be, for example, the upper right, the lower left, the lower right, or the like.
Further, the laser beam LL may be scanned on different lines in the drawing area 911 in the odd frame and the even frame.

Here, the change with time of the deflection angle of the movable plate 411a and the change with time of the deflection angle of the movable plate 421a at the time of drawing the image are as follows.
In the horizontal scanning, as shown in FIG. 8, the swing angle of the movable plate 411a gradually increases from the minimum swing angle, reaches the maximum swing angle, gradually decreases, reaches the minimum swing angle, and then again. The operation is gradually increased, and thereafter the operation is repeated in the same manner. As described above, in the projector 2, the swing angle of the movable plate 411a does not change abruptly. Therefore, the swing angle of the movable plate 411a of the optical scanner 41 configured to operate using resonance can be adjusted easily and reliably. it can.

Further, in the vertical scanning, as shown in FIG. 9, after the swing angle of the movable plate 421a gradually increases from the minimum swing angle, reaches the maximum swing angle, gradually decreases, and then reaches the minimum swing angle. Then, it gradually increases again, and thereafter the operation is repeated in the same manner. As described above, in the projector 2, the swing angle of the movable plate 421 a does not change abruptly. Therefore, the swing angle of the movable plate 421 a of the optical scanner 42 can be adjusted easily and reliably. In addition, an image is displayed between a display period (drawing period) in which an image is drawn in an odd frame (vertical scanning forward path) and a display period in which an image is drawn in an even frame (vertical scanning backward path). A non-display period (non-drawing period) during which no drawing is performed is provided. In this display period, each timing such as a timing for starting drawing of the next frame can be adjusted.
And since the image is drawn both in the forward and backward passes of the scanning in the vertical direction, that is, when the movable plate 421a is rotated in a predetermined direction and when it is rotated in the opposite direction, the conventional method is used. A vertical blanking period becomes unnecessary, and the non-display period can be shortened. Thereby, a time aperture ratio (ratio of the period which draws an image) can be made high.

In other words, the vertical non-display period in one frame can be shortened by reciprocatingly drawing, thereby increasing the vertical time aperture ratio and drawing an image by performing horizontal scanning only in the forward path of vertical scanning. When the angular velocity (velocity) of the movable plate 411a is the same as the case, the number of frames (frame number) per unit time can be increased compared to the case of drawing an image only on the forward path. Thereby, it is possible to easily cope with a fast movement in a moving image. In other words, when the image is drawn by performing horizontal scanning only in the forward path of the vertical scanning and when the number of frames per unit time is the same, the angular velocity of the movable plate 411a is larger than when the image is drawn only in the forward path. Can be made smaller, whereby an image can be stably drawn. In the above case, when the angular velocity of the movable plate 411a is not changed, drawing with higher vertical resolution is possible.
Here, in practice, for example, the inertia (inertia moment) of the movable plates 411a and 421a of the optical scanners 41 and 42 may be large, and the movable plates 411a and 421a may not follow instantaneously. In such a case, for example, the drive current of the optical scanners 41 and 42 may be set to zero, or the optical scanners 41 and 42 may be driven in reverse phase (braking).

As described above, according to the projector 2, trapezoidal distortion of the image is prevented by the distortion correcting unit 5 without increasing the deflection angle of the movable plates 411a and 421a while increasing the time aperture ratio. be able to.
In addition, since the image is drawn by performing horizontal scanning in each of the forward path and the backward path of the vertical scanning, the swing angle of the movable plate 421a is suddenly changed when switching from the forward path to the backward path in the vertical scanning or when switching from the backward path to the forward path. Therefore, the deflection angle of the movable plate 421a can be adjusted easily and reliably.

Next, a modified example will be described based on FIG.
In the projector 2 shown in FIG. 10, the deflection width of the laser beam LL is not constant along the vertical direction in the light emission state, but the deflection width of the laser beam LL in the light emission state is the deflection angle of the movable plate 411a. Compared to the case where the above adjustment is not performed, the deflection angle of the movable plate 411a is adjusted so as to be aligned along the vertical direction. As a result, the upper width of the drawable area 912 where the image can be drawn is reduced, the shape of the drawable area 912 approaches a rectangle (including a square), and the non-drawn area can be reduced.
In the projector 2, a rectangular drawing area 911 is set on the drawing area 911, that is, in the drawable area 912, and the laser light LL emitted from the light source unit 3 is projected (irradiated) into the drawing area 911. The driving of the light source unit 3 is controlled. Thereby, the trapezoid distortion of an image can be prevented.

The configuration of the projector 2 has been described above. By using the optical scanners 41 and 42 for the present embodiment, the configuration of the projector 2 becomes relatively simple.
Such a projector 2 is provided in the vicinity of the screen 9 and displays (draws) an image in the drawing area 911 by proximity projection. Thereby, since the optical path length of the laser beam LL emitted from the projector 2 can be shortened, the laser beam LL can be more reliably scanned at a desired position in the drawing region 911 and a denser image ( High-pixel image) can be displayed. Further, since the laser light LL emitted from the projector 2 can be prevented from being blocked by, for example, a pedestrian or the like, a desired image is displayed in the drawing region 911 without being affected by the surrounding environment (population density or the like). Can be displayed. In addition, arrangement | positioning of the projector 2 is not specifically limited, For example, you may arrange | position in the position far from the screen 9 (namely, it may not be a proximity | contact projection).

  In the present embodiment, the projector 2 is provided on the lower side in the vertical direction of the screen 9, and displays (draws) an image in the drawing area 911 by scanning the laser beam LL upward. It is configured. As described above, by arranging the projector 2 below the screen 9, it becomes easy to adjust the amount of external light applied to the drawing area 911 of the screen 9. The arrangement of the projector is not limited to this. For example, the projector may be provided above the screen 9, may be provided beside the screen, or may be provided behind the screen 9 (back side). It may be done.

Next, the human sensor 7 will be described.
As shown in FIG. 2, the human sensor 7 includes a sensor unit 71, a storage unit 72, and a determination unit 73. Such a human sensor 7 has a function of detecting whether or not a person is present in each of the first detection area S1 and the second detection area S2 described later. . Such a human sensor 7 is accommodated in the housing 11 (however, a part of the sensor unit 71 may be exposed from the housing 11 so that the function can be exhibited). , Provided in the vicinity of the screen 9. In the present embodiment, the human sensor 7 is housed in the housing 11. However, the human sensor 7 is not limited to this, and the human sensor 7 may be provided separately from the housing 11.

  The sensor unit 71 can detect the presence or absence of a human near the sensor unit 71, and can measure the separation distance between the sensor unit 71 and the detected human. The sensor unit 71 is not particularly limited as long as the above-described functions can be exhibited. For example, an infrared sensor using infrared rays or an ultrasonic sensor using ultrasonic waves can be used. Furthermore, a sensor in which an infrared sensor and an ultrasonic sensor are combined can also be used.

  The infrared sensor detects the presence or absence of a human in the vicinity of the sensor unit 71 by detecting the temperature change using infrared rays when an object (human) having a temperature difference from the ambient temperature moves within the sensing area. It is a sensor that detects the distance to humans. One ultrasonic sensor transmits an ultrasonic wave by a transmitter, receives a reflected wave by a receiver, and calculates the relationship between the time required from transmission to reception and the speed of sound, and thereby near the sensor unit 71 It is a sensor that detects the presence or absence of humans and the distance to humans.

In the storage unit 72, a first detection area S1 and a second detection area S2, which are areas for determining the presence or absence of a human being, are set.
As shown in FIG. 11, the first detection region S1 is set to include the screen 9 when viewed from the vertical direction. Thus, by setting the first detection area S1 to include the screen 9, it is possible to reliably detect the presence of a human in the vicinity of the screen 9.

  The first detection region S1 has a semicircular shape centered on the center of the drawing region 911 of the screen 9 when viewed from the vertical direction. Thereby, the distance to the edge of the first detection region S1 can be made substantially equal in any of the radial directions starting from the center of the drawing region 911. Therefore, the presence of a person near the screen 9 can be reliably detected without missing. The shape of the first detection region S1 is not particularly limited, and may be, for example, a rectangle or a polygon such as a positive direction. It may be a mold.

The second detection region S2 is set at a position farther from the screen 9 than the first detection region S1. Specifically, the second detection region S2 is set so as to be in contact with and surround the outer periphery (edge) of the first detection region S1. The second detection region S2 has a semicircular shape concentric with the first detection region S1.
The size (radius) of the second detection region S2 varies depending on the size (size) of the drawing region 911 of the screen 9, but the second detection region S2 is located at a position farthest from the screen 9 in the second detection region S2. It is preferable that the size is such that the image content displayed in the drawing area 911 can be recognized (identified) even by a human being. As a result, all persons located in the second detection area S2 and the first detection area S1 can recognize the contents of the image displayed in the drawing area 911. Here, “the degree that can be identified” means that, for example, when the image displayed in the drawing area 911 is a human face, the gender, the approximate age, etc. can be determined, or the image displayed in the drawing area 911 is displayed. If the image is a character, it means that the character can be recognized.

  Here, when the radius of the first detection region S1 is RS1, and the radius of the outer periphery of the second detection region S2 is RS2, the relationship between RS1 and RS2 is not particularly limited, but RS1 is 0.4RS2 or more. It is preferably about 0.7RS2 or less. By setting RS1 in the numerical range as described above, the first detection region S1 and the second detection region S2 can be set in a well-balanced manner.

  When the sensor unit 71 detects a person, the determination unit 73 stores the person in the storage unit 72 based on a separation distance between the person and the sensor unit 71 (hereinafter also simply referred to as “separation distance D”). It is determined which of the first detection area S1 and the second detection area S2 is located. Then, the determination unit 73 transmits this determination result to the control means 8. Such determination by the determination unit 73 may be performed in real time (continuously) or intermittently.

  Specifically, the storage unit 72 stores the radius RS1 of the first detection region S1 and the radius RS2 of the outer periphery of the second detection region S2, and the determination unit 73 determines that the separation distance D is greater than the radius RS1. If it is smaller, it is determined that the person is located in the first detection area S1, and if the separation distance D is larger than the radius RS1 and smaller than the radius RS2, the person is located in the second detection area S2. Judge that In the present embodiment, since the sensor unit 71 is provided in the vicinity of the screen 9, the separation distance D can be regarded as the separation distance between the screen 9 (the center of the drawing region 911) and the person. Therefore, according to the determination method as described above, it is possible to accurately determine in which of the first detection area S1 and the second detection area S2 the person is located. .

  The human sensor 7 has been described above, but the configuration of the human sensor 7 is not limited to the above configuration. For example, as the sensor unit 71, a sensor that cannot measure the separation distance from the detected person may be used. In this case, a first sensor and a second sensor having a wider effective detection area than the first sensor are prepared. The first sensor and the second sensor are arranged close to each other, the effective detection area of the first sensor is defined as a first detection area S1, and the effective detection area of the first sensor is changed from the effective detection area of the second sensor. The area excluding the effective detection area is defined as a second detection area S2. When both the first sensor and the second sensor detect a person, it is determined that the person is located in the first detection area S1, and only the second sensor detects the person. In such a case, it may be determined that a person is located in the second detection region S2. In this case, the storage unit 72 can be omitted.

Further, for example, as the sensor unit 71, one or a plurality of first pressure sensors installed under the floor of the first detection region S1 and one or a plurality of sensors installed under the floor of the second detection region S2. A second pressure sensor may be used. In this case, if the first pressure sensor reacts, it is determined that a person is located in the first detection area S1, and if the second pressure sensor reacts, a person exists in the second detection area S2. What is necessary is just to judge that it is located. Also in this case, the storage unit 72 can be omitted.
The number of sensor units 71 is not limited to one as in the present embodiment, and two or more sensor units 71 may be arranged. This is advantageous when one sensor unit 71 cannot cover the entire area of the first detection area S1 and the second detection area S2.

Next, the control means 8 will be described.
When the human sensor 7 detects the presence of a person in the first detection area S1 or the second detection area S2, the control means 8 displays an image in the drawing area 911, and the human sensor 7 When the presence of a person in any one of the first detection area S1 and the second detection area S2 is not detected, the driving of the projector 2 is controlled so that no image is displayed in the drawing area 911. In other words, the operation of the projector 2 is performed so that an image is displayed in the drawing area 911 only when the human sensor 7 detects the presence of a person in the first detection area S1 or the second detection area S2. To control.

  By such control, it is possible to prevent unnecessary driving of the projector 2 such as displaying an image in the drawing area 911 even though there is no human who may recognize the image displayed in the drawing area 911. it can. That is, power saving driving of the image forming apparatus 1 can be achieved, and the life of the projector 2 can be extended by eliminating unnecessary driving of the projector 2.

  For example, when a person who has entered the first detection area S1 or the second detection area S2 is detected and an image is displayed in the drawing area 911, the person is suddenly displayed in the drawing area 911. There is a possibility that the user is interested in the image and stares at the image displayed in the drawing area 911. For this reason, by performing the control as described above, it is possible to give an interest (interest) to an image displayed in the drawing area 911 for a person passing near the screen 9. In the case of advertising for commercials, promotional videos, etc., it is possible to exert an excellent advertising effect.

In the present embodiment, the control means 8 is a driving circuit that the projector 2 has when the human sensor 7 does not detect the presence of a person in any of the first detection area S1 and the second detection area S2. By stopping the driving of 310r, 310g, and 310b, an image is not displayed in the drawing area 911. Thereby, the display of the image in the drawing area 911 is surely stopped. Further, according to this, the laser light RR, GG, and BB are not emitted from the light source 320r, the light source 320g, and the light source 320b, so that the power saving driving of the projector 2 can be achieved.
Further, the control means 8 includes a case where the human sensor 7 detects the presence of a person in the first detection area S1 and a case where the human sensor 7 detects a person in the second detection area S2. The drive of the projector 2 is controlled so as to change the image pattern of the image displayed in the drawing area 911.

  Specifically, when the human sensor 7 detects the presence of a person in the second detection region S2, the control unit 8 performs speckle reduction processing of the laser light LL by the speckle reduction processing unit 6. If the human sensor 7 detects the presence of a person in the first detection area S1 without the high frequency current being superimposed on each of the drive circuits 310r, 310g, 310b, the speckle reduction processing means 6 The driving of the projector 2 is controlled so that the speckle reduction processing of the laser beam LL is performed (that is, the high-frequency current is superimposed on each of the driving circuits 310r, 310g, and 310b).

  For example, when the human sensor 7 detects a person who has entered the second detection area S2 by such control, an image having a glare and glimmering feeling in which the speckle noise is not reduced is displayed in the drawing area 911. Is displayed. Such an image is difficult to see compared to an image with reduced speckle noise, but is conspicuous compared with an image with reduced speckle noise. Therefore, by causing a person in the second detection region S2 to observe an image in which the speckle noise is not reduced (that is, a person relatively far from the screen 9), The image displayed in the drawing area 911 can be impressed strongly.

  The person who is strongly impressed with the image displayed in the drawing area 911 is expected to approach the screen 9 in order to observe the image in more detail, and the person starts from the second detection area S2 to the first detection area S2. Move to the detection area S1. When the person moves to the first detection area S1, a clear image with reduced speckle noise and no flicker is displayed in the drawing area 911. Therefore, the image displayed in the drawing area 911 can be observed without giving the human an uncomfortable feeling caused by speckle noise.

Therefore, according to the control of the control means 8 as described above, attention (attention, interest, interest) of a person who is relatively far from the drawing area 911 can be collected in the image displayed in the drawing area 911. It is possible to provide a more easily viewable image to a person who has approached the drawing area 911 or a person who is originally located in the first detection area S1. In other words, it is possible to allow more people to recognize the image displayed in the drawing area 911 by properly using an image shifted to be more conspicuous than visibility and an image shifted to easier to see than visibility. Can do. Therefore, particularly when the image displayed in the drawing area 911 is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.
From the above description, the second detection area S2 can also be referred to as a “customer area”, and the first detection area S1 can also be referred to as an “advertisement area”.

In addition to the control as described above, the control means 8 also performs the following control. That is, when the human sensor 7 detects the presence of a person in the first detection area S1, the control means 8 detects when the human sensor 7 detects the presence of a person in the second detection area S2. In contrast, the driving of the projector 2 is controlled so that the luminance (brightness) of the image displayed in the drawing area 911 is lower. The change in luminance can be achieved, for example, by correcting the drive signal transmitted from the light source modulator 54 to the drive circuits 310r, 310g, and 310b.
By such control, for example, when the human sensor 7 detects a person who has entered the second detection area S2, a relatively bright and conspicuous image is displayed in the drawing area 911. By causing a person in the second detection area S2 to observe such a bright and conspicuous image, the person displayed in the drawing area 911 can be strongly impressed.

  The person who is strongly impressed with the image displayed in the drawing area 911 is expected to approach the screen 9 in order to observe the image in more detail, and the person starts from the second detection area S2 to the first detection area S2. Move to the detection area S1. When the person moves to the first detection area S1, an easy-to-see image with reduced brightness (brightness) is displayed in the drawing area 911. Therefore, the image displayed in the drawing area 911 can be observed without giving unpleasant feeling to the human.

  Therefore, according to the control of the control means 8 as described above, attention can be paid to the image displayed in the drawing area 911, and the person who has approached the drawing area 911 or the first detection area from the beginning. It is possible to provide an image that is easier to see to the person located in S1. In other words, it is possible to allow more people to recognize the image displayed in the drawing area 911 by properly using an image shifted to be more conspicuous than visibility and an image shifted to easier to see than visibility. Can do. Therefore, particularly when the image displayed in the drawing area 911 is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

  Furthermore, the control means 8 is a case where character information is included in the image displayed in the drawing area 911, and when the human sensor 7 detects the presence of a person in the first detection area S1, The driving of the projector 2 is controlled so that the size of the characters displayed in the drawing area 911 is smaller than when the human sensor 7 detects the presence of a person in the second detection area S2. According to such control, the character size is changed according to the distance between the screen 9 (drawing area 911) and the person, so the character size is not too large and not too small, and the person recognizes. It becomes the size suitable for. Therefore, the person can recognize the image (character) displayed in the drawing area 911 without a sense of incongruity. In particular, when the image displayed in the drawing area 911 is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

  Here, when a person is located in any of the first detection area S1 and the second detection area S2 (that is, the human sensor 7 is in the first detection area S1 and the second detection area). The control means 8 can perform the following control (determination) when human presence is detected in both areas S2. In the following, a person located in the first detection area S1 is also referred to as a “person close to the screen 9”, and a person located in the second detection area S2 is “a person far from the screen 9”. Also say.

  First, the control means 8 performs control corresponding to the case where a person is present in the first detection area S1. That is, speckle reduction processing is performed on the drawing area 911 and the brightness is suppressed (the brightness is suppressed compared to the image displayed in the drawing area 911 when a person is located in the second detection area S2. The driving of the projector 2 is controlled so as to display an image. This control method is a control method in which a person located in the first detection area S1 is given priority over a person located in the second detection area S2. Since it is considered that the person near the screen 9 is more likely to be interested in the image displayed in the drawing area 911 (or is more likely to be interested), the person closer to the screen 9 By displaying an image that can be easily recognized by humans in the drawing area 911, an excellent advertising effect can be exhibited.

  Secondly, the control means 8 performs control corresponding to the case where a human is present in the second detection region S2. That is, the speckle reduction process is not performed on the drawing area 911 and the luminance is high (the luminance is higher than that of the image displayed in the drawing area 911 when a person is located in the first detection area S1. The driving of the projector 2 is controlled so as to display a high image. This control method is a control method in which a person located in the second detection area S2 is given priority over a person located in the first detection area S1. As described above, it is said that a person close to the screen 9 is more likely to be interested in the image displayed in the drawing area 911. This is because a person close to the screen 9 This means that even if the image displayed in the area 911 is somewhat difficult to see due to speckle noise or the like, the possibility of observing the image is high. Therefore, the speckle reduction processing is not performed in the drawing area 911 and an image with high brightness is displayed, so that a person far from the screen 9 has a strong impression of the image displayed in the drawing area 911. In addition to interest, the person on the side near the screen 9 can recognize the image displayed in the drawing area 911. Therefore, even with such a control method, an excellent advertising effect can be exhibited as in the first control method.

Second Embodiment
Next, a second embodiment of the image forming apparatus of the present invention will be described.
FIG. 12 is a diagram showing a second embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the second embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the second embodiment is substantially the same as the first embodiment except that the display object is a wall surface instead of a screen. In FIG. 12, the same reference numerals are given to the same configurations as those in the above-described embodiment.

  As shown in FIG. 12, in the present embodiment, a drawing region W11 is formed above the image forming apparatus 1 on the wall surface (surface) W1 of the wall W. The image forming apparatus 1 (projector 2) is configured to display (draw) a desired image in the drawing area W11 by scanning the drawing area W11 with the laser beam LL. In this way, by directly displaying an image on the wall surface W1, it is not necessary to arrange a screen as in the first embodiment described above. In other words, since the image can be displayed anywhere on the wall surface, the convenience of the image forming apparatus 1 is improved.

Also by such 2nd Embodiment, the effect similar to 1st Embodiment can be exhibited.
Note that the “wall W” of the present embodiment substantially has a function of assuring the strength of the building, such as a glass window (glass plate) provided so as to separate the display product from the observer. Some of them are not included. If an advertisement image relating to a display product is drawn on the surface of the glass plate, an excellent advertisement effect can be obtained.

<Third Embodiment>
Next, a third embodiment of the image forming apparatus of the present invention will be described.
FIG. 13 is a diagram showing a third embodiment of the image forming apparatus of the present invention, and FIG. 14 is a diagram showing a modification of the third embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the third embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the third embodiment is substantially the same as that of the first embodiment except that the screen arrangement is different. In FIG. 13 and FIG. 14, the same reference numerals are given to the same configurations as those of the above-described embodiment.

As shown in FIG. 13, the screen 9 is provided on the floor F. On the other hand, the image forming apparatus 1 is provided on the wall W. The image forming apparatus 1 (projector 2) is configured to display (draw) a desired image in the drawing area 911 by scanning the drawing area 911 of the screen 9 with light. Here, for example, since a pedestrian often walks downward (slanting forward), displaying the image in the drawing area 911 of the screen 9 provided on the floor F can attract the pedestrian's attention. it can.
In this embodiment, the image forming apparatus 1 is installed on the wall W, but the installation position of the image forming apparatus 1 is not particularly limited, and may be installed on the floor F. Further, the image forming apparatus 1 may be arranged so as to be embedded in the wall W.

As a modification of the present embodiment, as shown in FIG. 14, the screen 9 may be omitted and an image may be displayed in the drawing area F <b> 11 formed on the floor surface F <b> 1 of the floor F. The effect mentioned above can be exhibited also by this. Furthermore, the convenience of the image forming apparatus 1 is improved by displaying the image directly on the floor surface F1.
According to the third embodiment, the same effect as that of the first embodiment can be exhibited.

<Fourth embodiment>
Next, a fourth embodiment of the image forming apparatus of the present invention will be described.
FIG. 15 is a diagram showing a fourth embodiment of the image forming apparatus of the present invention, and FIG. 16 is a diagram showing a modification of the fourth embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the fourth embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the fourth embodiment is substantially the same as that of the first embodiment except that the screen arrangement is different. In FIG. 15 and FIG. 16, the same reference numerals are given to the same configurations as those of the above-described embodiment.

As shown in FIG. 15, the screen 9 is provided to bend across the wall W and the floor F. On the other hand, the image forming apparatus 1 is provided on the wall W. The image forming apparatus 1 (projector 2) is configured to display (draw) a desired image in the drawing area 911 by scanning the drawing area 911 of the screen 9 with light. Here, since the screen is normally provided in a plane, a human (pedestrian) in the vicinity of the screen 9 is displayed by displaying an image on the drawing area 911 of the bent screen 9 as in the present embodiment. Etc.).
In this embodiment, the image forming apparatus 1 is installed on the wall W, but the installation position of the image forming apparatus 1 is not particularly limited, and may be installed on the floor F.

Further, as a modification of the present embodiment, as shown in FIG. 16, the screen 9 is omitted, and an image is displayed on a drawing area WF11 formed across the wall surface W1 of the wall W and the floor surface F1 of the floor F. Also good. The effect mentioned above can be exhibited also by this. Furthermore, the convenience of the image forming apparatus 1 is improved by displaying the images directly on the wall surface W1 and the floor surface F1.
According to the fourth embodiment, the same effect as that of the first embodiment can be exhibited.

<Fifth Embodiment>
Next, a fifth embodiment of the image forming apparatus of the present invention will be described.
FIG. 17 is a view showing a fifth embodiment of the image forming apparatus of the present invention, and FIG. 18 is a view showing a modification of the fifth embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the fifth embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus according to the fifth embodiment is substantially the same as the first embodiment except that the arrangement of the image forming apparatus and the screen is different. In FIG. 17 and FIG. 18, the same reference numerals are given to the same components as those in the above-described embodiment.

As shown in FIG. 17, the screen 9 is provided on the ceiling C. The image forming apparatus 1 is also provided on the ceiling C. The image forming apparatus 1 (projector 2) is configured to display (draw) a desired image in the drawing area 911 by scanning the drawing area 911 of the screen 9 with light. In this way, by providing the screen 9 on the ceiling, the position of the screen 9 can be increased, so that attention can be gathered from the image displayed in the drawing area 911.
In the present embodiment, the image forming apparatus 1 is installed on the ceiling C. However, the installation position of the image forming apparatus 1 is not particularly limited, and may be installed on the wall W.

As a modification of the present embodiment, as shown in FIG. 18, the screen 9 may be omitted and an image may be displayed in the drawing area C <b> 11 formed on the ceiling surface C <b> 1 of the ceiling C. The effect mentioned above can be exhibited also by this. Furthermore, the convenience of the image forming apparatus 1 is improved by displaying the image directly on the ceiling surface C1.
According to the fifth embodiment, the same effect as that of the first embodiment can be exhibited.

<Sixth Embodiment>
Next, a sixth embodiment of the image forming apparatus of the present invention will be described.
FIG. 19 is a diagram showing a sixth embodiment of the image forming apparatus of the present invention, and FIG. 20 is a diagram showing a modification of the sixth embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the sixth embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the sixth embodiment is substantially the same as the first embodiment except that the arrangement of the image forming apparatus and the screen is different. In FIG. 19 and FIG. 20, the same reference numerals are given to the same configurations as those in the above-described embodiment.

As shown in FIG. 19, the screen 9 is bent and provided across the wall W and the ceiling C. On the other hand, the image forming apparatus 1 is provided on the ceiling C. The image forming apparatus 1 (projector 2) is configured to display (draw) a desired image in the drawing area 911 by scanning the drawing area 911 of the screen 9 with light. Here, since the screen is normally provided in a plane, a human (pedestrian) in the vicinity of the screen 9 is displayed by displaying an image on the drawing area 911 of the bent screen 9 as in the present embodiment. Etc.).
In the present embodiment, the image forming apparatus 1 is installed on the ceiling C. However, the installation position of the image forming apparatus 1 is not particularly limited, and may be installed on the wall W.

Further, as a modification of the present embodiment, as shown in FIG. 20, the screen 9 is omitted, and an image is displayed on the drawing area WC11 formed across the wall surface W1 of the wall W and the ceiling surface C1 of the ceiling C. Also good. The effect mentioned above can be exhibited also by this. Furthermore, the convenience of the image forming apparatus 1 is improved by displaying an image directly on the wall surface W1 and the ceiling surface C1.
Also according to the sixth embodiment, the same effect as that of the first embodiment can be exhibited.

<Seventh embodiment>
Next, a seventh embodiment of the image forming apparatus of the present invention will be described.
21 is a schematic plan view showing an optical scanner included in a projector included in an image forming apparatus according to a second embodiment of the invention, FIG. 22 is a cross-sectional view taken along line BB in FIG. 21, and FIG. FIG. 24 is a block diagram showing a voltage applying unit of a driving unit included in the optical scanner shown in FIG. 21, and FIG. 24 is a diagram showing an example of voltages generated in the first voltage generating unit and the second voltage generating unit shown in FIG. 25A and 25B are diagrams (a is a side view, and b is a front view) for explaining the operation of a projector included in an image forming apparatus according to a seventh embodiment of the present invention. In the following, for convenience of explanation, the front side in FIG. 21 is referred to as “up”, the back side in FIG. 21 is referred to as “down”, the right side is referred to as “right”, and the left side is referred to as “left”. The upper side, the lower side is called “lower”, the right side is called “right”, and the left side is called “left”.

Hereinafter, the image forming apparatus according to the seventh embodiment will be described focusing on the differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the seventh embodiment is different from that of the first embodiment except that the configuration of the optical scanner provided in the projector is different and that the trajectory of scanning (horizontal scanning) in the first direction on the drawing area 911 is not a straight line. Is almost the same. In FIG. 23 and FIG. 25, the same reference numerals are given to the same configurations as those in the above-described embodiment.

The optical scanning unit 4 has one optical scanner 45 of a so-called two-degree-of-freedom vibration system.
The optical scanner 45 includes a base 46 provided with a first vibration system 46a, a second vibration system 46b, and a support portion 46c as shown in FIG. 21, a counter substrate 47 disposed to face the base 46, and the base 46. A spacer member 48 provided between the counter substrate 47, a permanent magnet 491, and a coil 492 are provided.

The first vibration system 46a includes a frame-shaped drive unit 461a provided inside the frame-shaped support unit 46c, and a pair of first connection units 462a that support the drive unit 461a on the support unit 46c. 463a.
The second vibration system 46b includes a movable plate 461b provided inside the drive unit 461a, and a pair of second coupling portions 462b and 463b that support the movable plate 461b on both sides of the drive unit 461a. Yes.
The drive unit 461a has an annular shape in a plan view of FIG. The shape of the drive unit 461a is not particularly limited as long as it has a frame shape. For example, the drive unit 461a may have a quadrangular ring shape in a plan view of FIG. A permanent magnet 491 is joined to the lower surface of the driving unit 461a.

Each of the first connecting portions 462a and 463a has a longitudinal shape and can be elastically deformed. The first connecting portions 462a and 463a connect the driving portion 461a and the supporting portion 46c so that the driving portion 461a can be rotated with respect to the supporting portion 46c. The first connecting portions 462a and 463a are provided coaxially with each other, and the drive portion 461a is located with respect to the support portion 46c around this axis (hereinafter referred to as “rotation center axis J3”). And is configured to rotate.
The first connecting portion 462a is provided with a piezoelectric element 465a for detecting the angle (the turning angle around the turning central axis J3) (behavior) of the driving portion 461a.

  The movable plate 461b has a circular shape in plan view of FIG. The shape of the movable plate 461b is not particularly limited as long as the movable plate 461b can be formed inside the driving unit 461a. May be. A light reflecting portion 464b having light reflectivity is formed on the upper surface of the movable plate 461b.

Each of the second connecting portions 462b and 463b has a longitudinal shape and can be elastically deformed. The second connecting portions 462b and 463b connect the movable plate 461b and the driving portion 461a so that the movable plate 461b can be rotated with respect to the driving portion 461a, respectively. Such second connecting portions 462b and 463b are provided coaxially with each other, and the movable plate 461b is located with respect to the drive portion 461a around this axis (hereinafter referred to as “rotation center axis J4”). It is configured to rotate.
The second connecting portion 462b is provided with a piezoelectric element 465b for detecting the angle (rotation angle around the rotation center axis J4) (behavior) of the movable plate 461b.

As shown in FIG. 21, the rotation center axis J3 and the rotation center axis J4 are orthogonal to each other. Further, the centers of the drive unit 461a and the movable plate 461b are respectively located on the intersections of the rotation center axis J3 and the rotation center axis J4 in the plan view of FIG. Hereinafter, for convenience of explanation, an intersection of the rotation center axis J3 and the rotation center axis J4 is also referred to as an “intersection point G”.
As shown in FIG. 22, the base 46 as described above is bonded to the counter substrate 47 via the spacer member 48. A coil 492 that generates a magnetic field acting on the permanent magnet 491 is provided on the upper surface of the counter substrate 47.

  The permanent magnet 491 passes through the intersection point G in the plan view of FIG. 21 and is inclined with respect to the rotation center axis J3 and the rotation center axis J4 (this line segment is referred to as “line segment M”). (Also called). Such a permanent magnet 491 has an S pole on one side in the longitudinal direction with respect to the intersection point G and an N pole on the other side. In FIG. 22, the left side of the permanent magnet 491 in the longitudinal direction is the S pole and the right side is the N pole.

  In the plan view of FIG. 21, the inclination angle θ of the line segment M with respect to the rotation center axis J3 is preferably 30 to 60 degrees, more preferably 40 to 50 degrees, and approximately 45 degrees. Is more preferable. By providing the permanent magnet 491 in this manner, the movable plate 461b can be smoothly rotated around the rotation center axis J3 and the rotation center axis J4. In the present embodiment, the line segment M is inclined about 45 degrees with respect to the rotation center axis J3 and the rotation center axis J4.

  Further, as shown in FIG. 22, a recess 491 a is formed on the upper surface of the permanent magnet 491. The recess 491a is an escape portion for preventing contact between the permanent magnet 491 and the movable plate 461b. By forming such a recess 491a, it is possible to prevent the movable plate 461b from coming into contact with the permanent magnet 491 when the movable plate 461b rotates around the rotation center axis J3.

The coil 492 is formed so as to surround the outer periphery of the drive unit 461a in the plan view of FIG. Thereby, when the optical scanner 45 is driven, contact between the drive unit 461a and the coil 492 can be reliably prevented. As a result, the distance between the coil 492 and the permanent magnet 491 can be made relatively short, and the magnetic field generated from the coil 492 can be efficiently applied to the permanent magnet 491.
The coil 492 is electrically connected to the voltage application unit 493, and when a voltage is applied to the coil 492 by the voltage application unit 493, the respective axes of the rotation center axis J3 and the rotation center axis J4 from the coil 492. A magnetic field is generated in the axial direction perpendicular to.

  As shown in FIG. 23, the voltage applying means 493 includes a first voltage generator 493a that generates a first voltage V1 for rotating the movable plate 461b about the rotation center axis J3, and a movable plate 461b. A second voltage generator 493b that generates a second voltage V2 for rotating around the rotation center axis J4 is superimposed on the first voltage V1 and the second voltage V2, and the voltage is applied to the coil 492. And a voltage superimposing portion 493c to be applied.

Similarly to FIG. 9 of the first embodiment, the first voltage generator 493a, as shown in FIG. 24A, has a first voltage V1 (vertical scanning) that periodically changes at a period T1 that is twice the frame frequency. Voltage).
The first voltage V1 has a waveform like a triangular wave. Therefore, the optical scanner 45 can perform vertical reciprocating scanning (sub scanning) of light effectively. Note that the waveform of the first voltage V1 is not limited to this. Here, the frequency (1 / T1) of the first voltage V1 is not particularly limited as long as it is a frequency suitable for vertical scanning, but is preferably 15 to 40 Hz (about 30 Hz).
In the present embodiment, the frequency of the first voltage V1 is different from the torsional resonance frequency of the first vibration system 46a configured by the drive unit 461a and the pair of first coupling units 462a and 463a. Has been adjusted.

On the other hand, as shown in FIG. 24B, the second voltage generator 493b generates a second voltage V2 (horizontal scanning voltage) that periodically changes at a period T2 different from the period T1. .
The second voltage V2 has a waveform like a sine wave. Therefore, the optical scanner 45 can perform main scanning of light effectively. Note that the waveform of the second voltage V2 is not limited to this.

  The frequency of the second voltage V2 is not particularly limited as long as it is higher than the frequency of the first voltage V1 and is suitable for horizontal scanning, but is preferably 10 to 40 kHz. As described above, the frequency of the second voltage V2 is set to 10 to 40 kHz, and the frequency of the first voltage V1 is set to about 30 Hz as described above, so that the movable plate 461b can be moved at a frequency suitable for drawing on the screen. It can be rotated around the rotation center axis J3 and the rotation center axis J4. However, if the movable plate 461b can be rotated around each of the rotation center axis J3 and the rotation center axis J4, the combination of the frequency of the first voltage V1 and the frequency of the second voltage V2 can be obtained. There is no particular limitation.

In the present embodiment, the frequency of the second voltage V2 is adjusted to be equal to the torsional resonance frequency of the second vibration system 46b configured by the movable plate 461b and the pair of second connecting portions 462b and 463b. Has been. Thereby, the rotation angle of the movable plate 461b around the rotation center axis J3 can be increased.
When the resonance frequency of the first vibration system 46a is f ₁ [Hz] and the resonance frequency of the second vibration system 46b is f ₂ [Hz], f ₁ and f ₂ are f ₂ > f. ₁ is preferably satisfied, and more preferably f ₂ ≧ 10f ₁ is satisfied. As a result, the movable plate 461b is rotated more smoothly around the rotation center axis J3 at the frequency of the first voltage V1, and more smoothly at the frequency of the second voltage V2 around the rotation center axis J4. Can do.

The first voltage generation unit 493a and the second voltage generation unit 493b are each connected to a distortion correction unit (operation control device) 5 and driven based on a signal from the distortion correction unit (operation control device) 5. The voltage superimposing unit 493c is connected to the first voltage generating unit 493a and the second voltage generating unit 493b.
The voltage superimposing unit 493c includes an adder 493d for applying a voltage to the coil 492. The adder 493d receives the first voltage V1 from the first voltage generator 493a and receives the second voltage V2 from the second voltage generator 493b, and superimposes these voltages and applies them to the coil 492. It has become.

The optical scanner 45 configured as described above is driven as follows.
For example, the first voltage V1 as shown in FIG. 24A and the second voltage V2 as shown in FIG. 24B are superimposed by the voltage superimposing unit 493c, and the superimposed voltage is applied to the coil 492. Applied (this superimposed voltage is also referred to as “voltage V3”).
Then, with the voltage corresponding to the first voltage V1 in the voltage V3, the magnetic pole that tries to attract the south pole side of the permanent magnet 491 to the coil 492 and the N pole side away from the coil 492, and the permanent The magnetic poles of the magnet 491 that try to move the S pole side away from the coil 492 and that try to attract the N pole side to the coil 492 are alternately switched. Thereby, the drive part 461a rotates around the rotation center axis J3 at the frequency of the first voltage V1 together with the movable plate 461b while twisting and deforming the first coupling parts 462a and 463a.

  The frequency of the first voltage V1 is set to be extremely lower than the frequency of the second voltage V2, and the resonance frequency of the first vibration system 46a is the resonance frequency of the second vibration system 46b. Designed lower than. Therefore, the first vibration system 46a is easier to vibrate than the second vibration system 46b, and the first voltage V1 causes the movable plate 461b to rotate around the rotation center axis J4. Can be prevented.

On the other hand, a magnetic field that attempts to attract the south pole side of the permanent magnet 491 to the coil 492 and to separate the north pole side from the coil 492 with a voltage corresponding to the second voltage V2 in the voltage V3, and a permanent The magnetic poles of the magnet 491 that try to move the S pole side away from the coil 492 and that try to attract the N pole side to the coil 492 are alternately switched. As a result, the movable plate 461b rotates around the rotation center axis J4 at the frequency of the second voltage V2 while twisting and deforming the second connecting portions 462b and 463b.
Since the frequency of the second voltage V2 is equal to the torsional resonance frequency of the second vibration system 46b, the movable plate 461b is predominantly rotated around the rotation center axis J4 by the second voltage V2. Can do. Therefore, it is possible to prevent the movable plate 461b from rotating around the rotation center axis J3 together with the drive unit 461a by the second voltage V2.

  According to the optical scanner 45 as described above, laser light (light) can be scanned two-dimensionally with one actuator, and space saving of the optical scanning unit 4 can be achieved. For example, when a pair of optical scanners are used as in the first embodiment, the relative positional relationship between these optical scanners must be set with high accuracy, but this is not necessary in this embodiment. The manufacturing can be facilitated.

Further, in the present embodiment, unlike FIG. 7 of the first embodiment, as shown in FIG. 25, the laser light LL is emitted on the drawing region 911 in the light emission state in which the laser light (light) LL is emitted from the light source unit 3. A plurality of drawing lines (scanning lines) L that are the locus of the laser beam LL on the drawing region 911 when two-dimensionally scanned are arranged in a zigzag manner and distorted.
Further, since the scanning line is distorted, the video data calculation unit 52 reads out from the video data storage unit 51 while calculating data corresponding to pixel data to be drawn on the line to be scanned, and draws the drawing timing generator 53. After performing various correction calculations based on the drawing timing information input from, luminance data of each color is sent to the light source modulator 54.
Regarding processing other than the above, the same processing as in the first embodiment is performed.
Also according to the seventh embodiment, the same effect as that of the first embodiment can be exhibited.

  The image forming apparatus of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit is replaced with an arbitrary configuration having the same function. can do. In addition, any other component may be added to the present invention. Further, the present invention may be a combination of any two or more configurations (features) of the above embodiments.

In the above-described embodiment, the image forming apparatus has been described as drawing an image on a screen or drawing an image on a wall, a floor, a ceiling, or the like. However, the present invention is not limited thereto. The transmitted / diffused light may be viewed from the opposite side using.
In the above-described embodiment, the form in which the drawing area is formed on the surface of a screen, a wall, a floor, a ceiling, or the like (hereinafter simply referred to as “target object”) has been described. When the object has a pair of glass substrates and a screen sandwiched between them, a drawing region may be formed on the surface of the screen located inside the object, or on the surface of the glass substrate and the surface of the screen. Each of the drawing regions may be formed. That is, the drawing area may not be formed on the surface of the object.

In the first embodiment, a pair of optical scanners is used as the optical scanning unit. However, the present invention is not limited to this. For example, an optical scanner and a galvanometer mirror may be used. In this case, the galvanometer mirror is preferably used for vertical scanning.
In the present embodiment, the first direction is the “horizontal direction” and the second direction is the “vertical direction”. However, the present invention is not limited to this. For example, the first direction is the “vertical direction”. The second direction may be the “horizontal direction”.

In the above embodiment, the three dichroic mirrors are used to combine the red laser light, the green laser light, and the blue laser light to emit one laser light (light). However, the dichroic prism or the like is used. May be combined.
In the above-described embodiment, the light source unit has a configuration including a laser light source that emits a red laser, a laser light source that emits a blue laser, and a laser light source that emits a green laser. For example, a laser light source that emits a red laser, a laser light source that emits a blue laser, and a laser light source that emits an ultraviolet laser may be provided. In this case, the screen includes a phosphor that generates green fluorescence when irradiated with an ultraviolet laser. As a result, a full-color image can be displayed on the display surface.
Further, in the above-described embodiment, the form in which the human sensor (sensor unit) is provided in the vicinity of the screen has been described. However, the arrangement of the human sensor is not particularly limited, and is, for example, far from the screen. It may be provided at a position. Specifically, when the screen is hung on the wall, the human sensor may be provided on the ceiling.

  In the above-described embodiment, the speckle reduction processing unit is configured to superimpose a high-frequency current on the laser drive current. However, the speckle noise is not particularly limited as long as speckle noise can be reduced. When a screen is used as the object, the speckle reduction processing unit may be a vibration mechanism that vibrates the screen. By vibrating the screen, the position of the screen (display surface) changes sequentially, so that the interference state of laser light on the display surface changes and the speckle pattern changes. Although the speckle does not disappear instantaneously, the pattern changes at high speed due to vibration, and the observer recognizes the pattern averaged over time, so that the speckle noise is observed to disappear.

  In the above-described embodiment, the first detection area and the second detection area located farther from the first detection area are set as the detection areas. However, the present invention is not limited to this. In addition, third, fourth,... Detection regions located distal to the second detection region may be set. In this case, control is performed such that the speckle is gradually reduced or the brightness is lowered from the detection region located at the distal side toward the detection region located at the proximal side. May be performed.

  DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 11 ... Housing 2 ... Projector 3 ... Light source unit 31r, 31g, 31b ... Laser light source 310r, 310g, 310b ... Drive circuit 320r, 320g, 320b ... Light source 32r, 32g, 32b: Collimator lenses 33r, 33g, 33b: Dichroic mirror 4: Optical scanning unit 41: Optical scanner 411: Substrate 411a: Movable plate 411b ... Supporting unit 411c, 411d ... Connection unit 411e ... Light reflecting portion 412 ...... Spacer member 413 ...... Counter substrate 414 ...... Permanent magnet 415 ...... Coil 416 ...... Voltage applying means 417 ...... Driving means 42 ...... Optical scanner 421 a ...... Movable plate 421 e ...... Light reflecting portion 427 …… Drive means 43 …… Angle detection means 431 …… Piezoelectric Child 432 …… Electromotive force detection unit 433 …… Angle detection unit 44 …… Angle detection means 45 …… Optical scanner 46 …… Substrate 46a …… First vibration system 46b …… Second vibration system 46c …… Supporting unit 461a …… Driver 461b …… Moving plate 462a, 462b, 463a, 463b …… Connecting part 464b …… Light reflecting part 465a, 465b …… Piezoelectric element 47 …… Counter substrate 48 …… Spacer member 491 …… Permanent magnet 491a ...... Recess 492 ...... Coil 493 ...... Voltage application means 493a ...... First voltage generation part 493b ...... Second voltage generation part 493c ...... Voltage superposition part 493d ...... Adder 5 …… Distortion correction means 51 ...... ... Video data storage unit 52 ... Video data calculation unit 53 ... Drawing timing generation unit 54 ... Light source modulation unit 55 ... Deflection angle calculation 56 …… Angle indicating unit 57 …… Calibration curve storage unit 6 …… Speckle reduction processing means 6r, 6g, 6b …… High frequency current superimposing means 7 …… Human sensor 71 …… Sensor part 72 …… Storage part 73… ... Judgment unit 8 ... Control means 9 ... Screen 91 ... Display surface 911, W11, F11, WF11, C11, WC11 ... Drawing area 912 ... Drawable area J1, J2, J3, J4 ... Center of rotation Axis L ... Drawing line S1, S2 ... Detection area W ... Wall W1 ... Wall surface F ... Floor F1 ... Floor surface C ... Ceiling C1 ... Ceiling surface G ... Intersection M ... Line segment

Claims (18)

A projector configured to display an image by scanning light in a drawing area formed on a display surface;
When the first detection area and the second detection area located outside the drawing area with respect to the first detection area are set, each of the first detection area and the second detection area A human sensor for detecting whether or not a person is present in the area,
When the human sensor detects the presence of a person in the first detection area or the second detection area, the human sensor displays the image in the drawing area, and the human sensor detects the first detection area. When the presence of a person is not detected in any of the area and the second detection area, the projector is controlled so that the image is not displayed in the drawing area, and the human sensor is The image pattern of the image displayed in the drawing area is changed when the presence of a person in the first detection area is detected and when the human sensor detects the person in the second detection area. And an image forming apparatus having control means for controlling driving of the projector. The projector includes a light emitting unit that emits a laser;
A movable plate provided with a light reflecting portion for reflecting the laser emitted from the light emitting portion is provided so as to be rotatable in at least one direction or two directions orthogonal to each other, and the laser reflected by the light reflecting portion by the rotation The image forming apparatus according to claim 1, further comprising: an optical scanner that scans the drawing area.   When the human sensor does not detect the presence of a human in any of the first detection area and the second detection area, the control unit stops emitting the laser from the light emitting unit. The image forming apparatus according to claim 2. The projector has speckle reduction processing means for reducing the speckle of the laser,
The control means performs the speckle reduction processing of the laser by the speckle reduction treatment means when the human sensor detects the presence of a person in the first detection area, and the human sensor 4. The drive of the projector is controlled so that the speckle reduction processing means does not perform the speckle reduction processing of the laser when the presence of a human in the second detection area is detected. The image forming apparatus described in 1.   When the human sensor detects the presence of a person in the first detection area, the control means detects the presence of a human in the second detection area. The image forming apparatus according to claim 1, wherein the driving of the projector is controlled so that the brightness of the image displayed in the drawing area is lowered.   When the human sensor detects the presence of a person in the first detection area, the control means detects the presence of a human in the second detection area. The image forming apparatus according to claim 1, wherein the driving of the projector is controlled so that the size of characters displayed in the drawing area is reduced.   When the human sensor detects the presence of a person in both the first detection area and the second detection area, the control means includes a person in the first detection area. The image forming apparatus according to claim 1, wherein the projector is controlled so that an image pattern corresponding to a case is displayed in the drawing area.   When the human sensor detects the presence of a person in both the first detection area and the second detection area, the control means includes a human being in the second detection area. The image forming apparatus according to claim 1, wherein the projector is controlled so that an image pattern corresponding to a case is displayed in the drawing area.   The image forming apparatus according to claim 1, wherein the drawing area is formed in the vicinity of the projector, and the projector displays an image in the drawing area by proximity projection.   The image forming apparatus according to claim 1, wherein the projector displays an image recognizable even from a position far from the drawing area of the second detection area in the drawing area.   The image forming apparatus according to claim 1, wherein the drawing area is set in the first detection area.   The image forming apparatus according to claim 1, wherein the projector includes a distortion correction unit that corrects distortion of an image displayed in the drawing area.   The image forming apparatus according to claim 1, wherein the projector is provided on a lower side in a vertical direction with respect to the drawing area. The display surface is a wall surface;
The image forming apparatus according to claim 1, wherein the drawing area is formed on a surface of the wall. The display surface is a floor surface or a ceiling surface;
The image forming apparatus according to claim 1, wherein the drawing area is formed on a surface of the floor or a surface of the ceiling. The display surface is a wall surface and a floor surface;
The image forming apparatus according to claim 1, wherein the drawing area is formed across the surface of the wall and the surface of the floor. The display surface is a wall surface and a ceiling surface;
The image forming apparatus according to claim 1, wherein the drawing area is formed across the surface of the wall and the surface of the ceiling. The display surface is a screen surface;
The image forming apparatus according to claim 1, wherein the drawing area is formed on a surface of the screen.

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