JP2012083871A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of detecting a position of a detection object in a height direction of in an almost whole area of a projection screen.SOLUTION: A projector 100 has an infrared LD64a that irradiates an infrared laser beam that has a larger range than a projection range of red, green and blue visible laser beams irradiated from a red LD61a, a green LD62a and a blue LD63a.

Description

  The present invention relates to a projector, and more particularly, to a projector including a laser light generation unit.

  2. Description of the Related Art Conventionally, a projector including a laser light generation unit is known (see, for example, Patent Document 1).

  Patent Document 1 includes three laser light sources (laser light generation units) that respectively generate laser beams of three colors of red, green, and blue, and a scanning unit that scans the laser light emitted from the laser light sources. A projector is disclosed. In this projector, the laser light of three colors red, green and blue emitted from the laser light source is scanned by the scanning unit, so that a projection area such as a table or a wall surface is provided via a lens provided above the projector. The projection screen is projected on the screen. In addition, when the touch pen held by the user approaches the projection screen projected on the table, the laser light emitted from the laser light source is reflected by the touch pen, and the reflected laser light is provided in the projector. The position (coordinates) of the touch pen held by the user is detected by receiving the light. When projecting a projection screen on the table, laser beams of three colors of red, green, and blue are irradiated obliquely downward from above the projector.

JP 2009-123006 A

  However, in the projector described in Patent Document 1, since laser beams of three colors of red, green, and blue are irradiated obliquely downward from above the projector, the projector among the projection screens projected on the table is irradiated. Above the projection screen on the near side, laser beams of three colors of red, green and blue are irradiated to a relatively high position. Thereby, when the touch pen is located above the projection screen closer to the projector among the projection screens projected on the table, the position of the touch pen in the height direction can be detected. On the other hand, in the upper part of the projection screen far from the projector among the projection screens projected on the table, the height of the laser light of the three colors red, green, and blue to be irradiated is relatively low. When the touch pen is located at a relatively high position on the projection screen far from the projector, the laser light is not reflected by the touch pen. For this reason, when the touch pen is located above the projection screen far from the projector, there is a disadvantage that the position in the height direction of the touch pen is not detected. As a result, there is a problem that it is difficult to detect the position of the detection target in the height direction in almost the entire area of the projection screen.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to detect the position of the detection target in the height direction in almost the entire area of the projection screen. It is to provide a projector.

Means for Solving the Problems and Effects of the Invention

  A projector according to an aspect of the present invention includes a first laser light generation unit that irradiates a first laser beam of visible light for image projection, and a second laser beam that does not contribute to image projection and that detects a detection target. The second laser beam generator that irradiates the first laser beam, the first laser beam generator, and the second laser beam generator. The second laser beam emitted from the second laser beam generator is detected by an object to be detected. The second laser beam emitted from the second laser beam generator is received by receiving the reflected second laser beam and detecting the height position of the detection object from the projection area. A range larger than the projection range of the first laser beam irradiated from the one laser beam generator is configured to be irradiated.

  In the projector according to this aspect, as described above, the range in which the second laser light emitted from the second laser light generator is larger than the projection range of the first laser light emitted from the first laser light generator. When the first laser beam and the second laser beam are irradiated obliquely downward from above the projector, the second laser beam irradiates above the height at which the first laser beam is irradiated. Therefore, the second laser beam is also applied to a relatively high region of the image far from the projector among the images projected on the table. Thereby, the position of the detection target in the height direction can be detected in almost the entire area of the projection screen.

  In the projector according to the above aspect, preferably, the second laser light has an end portion in a direction away from the first laser light generation unit in a projection range of the first laser light irradiated from the first laser light generation unit, A range larger than the projection range of the first laser beam is irradiated to the side end portion of the projection range of one laser beam with respect to the irradiation direction of the first laser beam. If comprised in this way, the edge part of the direction away from the 1st laser beam generation part of the projection range of the 1st laser beam irradiated from the 1st laser beam generation part, and the 1st laser of the projection range of the 1st laser beam Since the second laser beam is irradiated above the height at which the first laser beam is irradiated at the side end portion with respect to the irradiation direction of the light, the first laser beam irradiated from the first laser beam generator The position in the height direction of the detection target at the end of the projection range away from the first laser light generator and the detection target at the side end with respect to the irradiation direction of the first laser light in the projection range of the first laser light Since the position of the object in the height direction can be detected, the position of the detection object in the height direction can be detected more reliably over almost the entire area of the projection screen.

  In the projector according to the above aspect, the detection unit preferably includes a first detection unit and a second detection unit provided above the first detection unit, and the second laser beam is the first laser beam. By irradiating a range larger than the projection range, the region corresponding to the height position of the second detection unit at the end of the projection range of the first laser beam is irradiated. If comprised in this way, when a detection target object is located in the area | region corresponding to the height position of the 2nd detection part of the edge part of the projection range of a 1st laser beam, it will be reflected by the detection target object. Since the laser beam is detected by the detection unit, it is possible to detect the position in the height direction of the detection target in the region corresponding to the height position of the second detection unit at the end of the projection range of the first laser beam. .

  In the projector according to the above aspect, the laser beam that irradiates a range other than the projection range of the first laser beam in the second laser beam preferably irradiates the projection range of the first laser beam in the second laser beam. It is configured to irradiate with an output larger than the laser beam. If comprised in this way, even if the position of a detection target object is away from a detection part, it becomes impossible to detect a detection target object due to the intensity | strength of the 2nd laser beam reflected by a detection target object being small. Can be suppressed.

  In this case, preferably, the second laser light generation unit and the detection unit are arranged on the same side in plan view, and the second laser light emitted from the second laser light generation unit is detected. It is configured to increase the output according to the distance from the unit. If comprised in this way, it will be located in the position away from the detection part resulting from the detection sensitivity of the 2nd laser beam reflected by the detection target object of a detection part falling according to the distance from a detection part. It can suppress that a detection target object becomes undetectable.

  In the projector in which the second laser light generation unit and the detection unit are arranged on the same side in plan view, preferably, the output of the second laser light is set to the square of the distance according to the distance from the detection unit. It is configured to irradiate while changing in proportion. If comprised in this way, even if the detection sensitivity of a detection part becomes small in inverse proportion to the square of distance according to the distance from a detection part, a detection target object can be detected easily.

  In the projector in which the second laser light generation unit and the detection unit are arranged on the same side in plan view, preferably, the second laser light linearly increases the output according to the distance from the detection unit. It is comprised so that it may be irradiated. If comprised in this way, even if the detection sensitivity of a detection part becomes linearly small according to the distance from a detection part, for example, a detection target object can be detected easily.

  In the projector according to the above aspect, it is preferable that the common projection unit projects the first laser beam emitted from the first laser beam generator and the second laser beam emitted from the second laser beam generator onto the projection region. The first laser light emitted from the first laser light generation unit and the second laser light emitted from the second laser light generation unit use a common projection unit, and the second laser light is first A range larger than the projection range of the laser beam is irradiated. If comprised in this way, the projection part which projects the 1st laser beam irradiated from a 1st laser beam generation part on a projection area, for example, and the 2nd laser beam irradiated from a 2nd laser beam generation part will be a projection area Unlike the case where a projection unit for projecting is separately provided, the structure can be simplified.

  In the projector according to the above aspect, preferably, the first laser light emitted from the first laser light generator and the second laser light emitted from the second laser light generator are emitted based on a common signal. The first laser beam is controlled to be in an off state in a predetermined period of the period in which the common signal is activated, so that the second laser beam is projected within the projection range of the first laser beam. It is comprised so that a larger range may be irradiated. With this configuration, by controlling the off state of the first laser light, it is easy to irradiate only the second laser light to the region outside the projection range of the first laser light using one common signal. Therefore, even when the projection ranges of the first laser beam and the second laser beam are made different, it is possible to prevent the control from becoming complicated.

  In the projector according to the above aspect, it is preferable that the width of the irradiation range of the second laser light irradiation range that exceeds the projection range of the first laser light is smaller than the width of the projection range of the first laser light. With such a configuration, the detection target in the vicinity of the projection range of the first laser light is detected without detecting the detection target positioned at a position far away from the projection range of the first laser light. Can be detected.

It is the schematic diagram which showed the use condition of the projector by 1st Embodiment of this invention. 1 is a block diagram showing a configuration of a projector according to a first embodiment of the present invention. It is a figure for demonstrating the operation | movement which detects the height of the detection target object in the comparatively low position of the projector by 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement which detects the height of the detection target object in the comparatively high position of the projector by 1st Embodiment of this invention. It is a figure for demonstrating the irradiation range of the visible laser beam and infrared laser beam of the projector by 1st Embodiment of this invention. It is a figure for demonstrating the irradiation timing of the visible laser beam and infrared laser beam of the projector by 1st Embodiment of this invention. It is a graph which shows the detection sensitivity of the infrared detector with respect to the projection distance of the infrared laser beam of the projector by 1st Embodiment of this invention. It is a graph which shows the output of the infrared laser beam with respect to the projection distance of the infrared laser beam of the projector by 1st Embodiment of this invention. It is the flowchart which showed operation | movement of the control part of the projector by 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement which moves the pointer of the projector by 1st Embodiment of this invention. It is a top view for demonstrating the operation | movement which moves the pointer shown in FIG. It is a figure for demonstrating the operation | movement of dragging and dropping of the projector by 1st Embodiment of this invention. It is a top view for demonstrating the operation | movement of dragging and dropping shown in FIG. It is a figure for demonstrating the operation | movement which removes a touch pen from the icon of the projector by 1st Embodiment of this invention. It is a graph which shows the detection sensitivity of the infrared detector with respect to the projection distance of the infrared laser beam of the projector by 2nd Embodiment of this invention. It is a graph which shows the output of the infrared laser beam with respect to the projection distance of the infrared laser beam of the projector by 2nd Embodiment of this invention. It is a block diagram which shows the 1st modification of the projector by 1st and 2nd embodiment of this invention. It is a block diagram which shows the 2nd modification of the projector by 1st and 2nd embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(First embodiment)
With reference to FIG. 1 and FIG. 2, the structure of the projector 100 by 1st Embodiment of this invention is demonstrated.

  A projector 100 according to the first embodiment of the present invention is configured to be used on a table 1 as shown in FIG. The projector 100 is configured such that a presentation (display) image 2a is projected onto a projection area such as the screen 2. The table 1 and the screen 2 are examples of the “projection area” in the present invention. Further, the projector 100 is configured to project an image 1a similar to the presentation image 2a onto the upper surface of a projection area such as the table 1. The size of the image 1a projected on the table 1 is projected to be smaller than the size of the image 2a projected on the screen 2.

  Further, the side surface of the projector 100 on the side on which the image 1a is projected does not contribute to image projection, and detects infrared laser light (substantially invisible laser light) having a wavelength of about 780 nm. Two infrared detectors 10a and 10b are provided. The two infrared detectors 10a and 10b are formed of a photodiode or the like. Further, the infrared detector 10b is arranged such that the height of the infrared detector 10b from the surface of the table 1 is larger than the height of the infrared detector 10a from the surface of the table 1. The infrared detector 10a is an example of the “first detector” in the present invention, and the infrared detector 10b is an example of the “second detector” in the present invention.

  Further, above the infrared detector 10b of the projector 100, there is provided a laser projection port 10c that is irradiated with infrared laser light and red, green, and blue visible laser light described later. Further, as shown in FIG. 2, a visible light filter 10d for cutting red, green and blue visible laser beams is provided on the projection area side of the infrared detectors 10a and 10b.

  The projector 100 includes an operation panel 20, a control processing block 30, a data processing block 40, a digital signal processor (DSP) 50, a laser light source 60, a video RAM (SD RAM) 71, a beam splitter 80, 2 Two magnifying lenses 90 and 91.

  The control processing block 30 includes a control unit 31 that controls the entire projector 100, a video I / F 32 that is an interface (I / F) for receiving an external video signal, an SD-RAM 33, and an external I / F 34. including.

  The data processing block 40 includes a data / gradation converter 41, a bit data converter 42, a timing controller 43, and a data controller 44.

  The digital signal processor 50 includes a mirror servo block 51 and a converter 52.

  The laser light source 60 includes a red laser control circuit 61, a green laser control circuit 62, a blue laser control circuit 63, and an infrared laser control circuit 64. Also, red laser light that irradiates red laser light (visible laser light) to the red laser control circuit 61, the green laser control circuit 62, the blue laser control circuit 63, and the infrared laser control circuit 64, respectively. (Laser diode) 61a, green LD 62a that emits green laser light (visible laser light), blue LD 63a that emits blue laser light (visible laser light), and infrared laser light An infrared LD 64a is connected. The red LD 61a, the green LD 62a, and the blue LD 63a are examples of the “first laser light generation unit” of the present invention, and the infrared LD 64a is an example of the “second laser light generation unit” of the present invention. The red laser beam, the green laser beam, and the blue laser beam are examples of the “first laser beam” of the present invention, and the infrared laser beam is the “second laser beam” of the present invention. It is an example.

  The laser light source 60 includes four collimating lenses 65, three polarization beam splitters 66a, 66b and 66c, a photodetector 67, a lens 68, and a MEMS for scanning the laser light in the horizontal direction and the vertical direction. The mirror 69a and the actuator 70 for driving the MEMS mirror 69a in the horizontal direction and the vertical direction are included. The MEMS mirror 69a is an example of the “projection unit” in the present invention.

  Further, the laser beams emitted from the red LD 61a, the green LD 62a, the blue LD 63a, and the infrared LD 64a are configured to be incident on a common MEMS mirror 69a. The red, green, and blue laser beams emitted from the red LD 61a, green LD 62a, and blue LD 63a are scanned onto the MEMS mirror 69a, thereby projecting images 1a and 2a on the table 1 and the screen 2, respectively.

  Here, in the first embodiment, as shown in FIGS. 3 and 4, the infrared laser light emitted from the infrared LD 64a is visible in red, green and blue visible from the red LD 61a, the green LD 62a and the blue LD 63a. It is configured to irradiate a range larger than the projection range of the laser light. Specifically, red, green, and blue visible laser beams are between a position B in the direction of arrow Y1 immediately below the position A where the projector 100 is disposed and a position C in the direction of arrow Y1 of position B. It is configured to irradiate the projection area. Further, the infrared laser light emitted from the infrared LD 64a is projected to a projection region between a position B in the arrow Y1 direction at a position A immediately below where the projector 100 is disposed and a position D in the arrow Y1 direction at the position B. It is configured to be irradiated. In other words, the projection region between the position C and the position D is configured to be irradiated with only infrared laser light without being irradiated with red, green, and blue visible laser light.

  Further, as shown in FIG. 5, in the region irradiated with both red, green and blue visible laser beams and infrared laser beam (projection range of visible laser beam and infrared laser beam), red LD 61a. The laser light emitted from each of the green LD 62a and the blue LD 63a and the infrared laser light emitted from the infrared LD 64a are configured to be scanned along the same scanning path. The light emitted from the infrared LD 64a and reflected by the detection target (touch pen) is configured to be detected by the infrared detectors 10a and 10b. That is, the planar position (coordinates) of the laser light emitted from the red LD 61a, the green LD 62a, and the blue LD 63a on the table 1, and the planar position (coordinates) of the infrared laser light emitted from the infrared LD 64a. Are configured to be the same. Also, based on the difference in intensity of the reflected light from the detection object (touch pen) detected by the infrared detectors 10a and 10b at the same time that the planar position (coordinates) of the detection object (touch pen) is detected, The position of the detection target (touch pen) in the height direction is detected.

  In the first embodiment, as shown in FIGS. 3 and 4, the projector 100 side (arrow Y2 direction side) of the end portion (position C) of the projection range of the laser light of red, green, and blue visible light is shown. It is configured to irradiate a region E (shaded portion) corresponding to the height direction (arrow Z1 direction) of the infrared detectors 10a and 10b. As a result, as shown in FIG. 4, the detection object (touch pen) gripped by the user is detected by infrared detectors 10a and 10b at the end (position C) of the projection range of laser light of red, green and blue visible light. Since the infrared laser beam is reflected by the detection object (touch pen) when it is located in the region corresponding to the height direction, the infrared detector 10a or 10b detects the position of the detection object in the height direction. It becomes possible.

  In the first embodiment, as shown in FIG. 5, the infrared laser beam is viewed from the end in the arrow Y1 direction (position) of the projection range of the red, green, and blue visible laser beams in a plan view. C) and the side (arrow X1 direction and arrow X2 direction) of the projection range of the red, green, and blue visible laser beams with respect to the irradiation direction (arrow Y1 direction) of the red, green, and blue visible laser beams And a range larger than the projected range of visible laser beams of red, green, and blue. Also, the end in the arrow Y2 direction of the irradiation range of the infrared laser light and the end in the arrow Y2 direction of the projection range of the red, green, and blue visible light laser beams are at the same position (position B). It is configured as follows.

  Also, the width W1 of the irradiation range of the infrared laser beam irradiation range that extends in the direction of the arrow Y1 of the red, green, and blue visible laser beam projection ranges is red, green, and blue visible light lasers. The light projection range is configured to be smaller than the width W2 in the Y direction. In addition, the width W3 of the irradiation range in the region exceeding the projection range of the red, green, and blue visible laser beams in the arrow X1 direction and the arrow X2 direction among the irradiation ranges of the infrared laser beams is red, green, and blue. The visible laser beam projection range is configured to be smaller than the width W4 in the X direction.

  As shown in FIG. 2, the operation panel 20 is provided on the surface or side surface of the housing of the projector 100. Operation panel 20 includes, for example, a display device (not shown) for displaying operation details, a switch for receiving an operation input to projector 100, and the like. The operation panel 20 is configured to transmit a signal corresponding to the operation content to the control unit 31 of the control processing block 30 when receiving an operation from the user.

  An external video signal given from the outside of the projector 100 is input to the Video I / F 32. Further, the external I / F 34 is configured to be capable of mounting a memory such as an SD card 92, for example. A PC or the like can be connected to the external I / F 34 via a cable or the like, and is configured to function as an output unit that can transmit position information of a touch pen held by the user to the PC. The control unit 31 reads data from the SD card 92, and the read data is configured to be stored in the video RAM 71.

  The control unit 31 is configured to control display of video based on image data temporarily stored in the Video RAM 71 by communicating with the timing controller 43 of the data processing block 40.

  In the data processing block 40, the timing controller 43 is configured to read data held in the video RAM 71 via the data controller 44 based on a signal output from the control unit 31. The data controller 44 is configured to transmit the read data to the bit data converter 42. The bit data converter 42 is configured to transmit data to the data / gradation converter 41 based on a signal from the timing controller 43. The bit data converter 42 has a function of converting image data given from the outside into data suitable for a format that can be projected by laser light. The timing controller 43 is connected to the infrared laser control circuit 64, and controls the infrared laser so that the laser light is emitted from the infrared LD 64a in synchronization with the laser light emitted from the red LD 61a, the green LD 62a, and the blue LD 63a. A signal is transmitted to the circuit 64.

  The data / gradation converter 41 converts the data output from the bit data converter 42 into gradations of three colors of red (R: Red), green (G: Green), and blue (B: Blue), The converted data is transmitted to the red laser control circuit 61, the green laser control circuit 62, and the blue laser control circuit 63, respectively.

  The red laser control circuit 61 is configured to transmit data from the data / gradation converter 41 to the red LD 61a. The green laser control circuit 62 is configured to transmit data from the data / gradation converter 41 to the green LD 62a. The blue laser control circuit 63 is configured to transmit data from the data / gradation converter 41 to the blue LD 63a.

  Further, the signals received by the two infrared detectors 10 a and 10 b provided on the side surface of the projector 100 on which the image 1 a is projected are configured to be input to the control unit 31 via the converter 52. ing. The control unit 31 is configured to calculate the height of the detection target from the table 1 based on the intensity difference of the reflected light from the detection target detected by the infrared detectors 10a and 10b. And the control part 31 discriminate | determines the operation | movement which drags an icon, and the operation | movement which a detection target leaves | separates from an icon based on the height from the table 1 of the detection target detected by the infrared detectors 10a and 10b. After determining that the icon has been dragged, the icon is dragged and a video for moving the icon in conjunction with the movement of the detection target is projected.

  Next, the irradiation timing of visible laser light and infrared laser light from the projector will be described with reference to FIG.

  In the first embodiment, red, green and blue visible laser beams and infrared laser beams are configured to be irradiated based on a common signal. Specifically, a period in which a common signal in which the horizontal synchronization signal and the vertical synchronization signal are at the H level is activated (a period between the horizontal scanning period h1 to the period h4 and a vertical scanning period). v1 to period v3) during a predetermined period (horizontal scanning period h1 to period h2 and vertical scanning period v1 to period v2). Laser light irradiation is controlled to be in an off state, and infrared laser light irradiation is controlled to be in an on state. Thereby, it is configured so that only visible laser light is irradiated without red, green and blue visible laser lights being irradiated.

  Also, the laser light irradiation of red, green, and blue visible light is controlled to be in the off state between the period h2 to the period h3 that is scanned horizontally and between the period v1 to the period v2 that is scanned vertically. In addition, irradiation with infrared laser light is controlled to be in an on state. Thereby, it is configured so that only visible laser light is irradiated without red, green and blue visible laser lights being irradiated.

  Further, the laser light irradiation of red, green, and blue visible light is controlled to be in an off state between the period h3 to the period h4 that is scanned horizontally and between the period v1 to the period v2 that is scanned vertically. In addition, irradiation with infrared laser light is controlled to be in an on state. Thereby, it is configured so that only visible laser light is irradiated without red, green and blue visible laser lights being irradiated.

  Also, the laser light irradiation of red, green, and blue visible light is controlled to be in the off state between the period h1 to the period h2 that is scanned horizontally and between the period v2 to the period v3 that is scanned vertically. In addition, irradiation with infrared laser light is controlled to be in an on state. Thereby, it is configured so that only visible laser light is irradiated without red, green and blue visible laser lights being irradiated.

  In addition, during the period h2 to the period h3 that is scanned horizontally and between the period v2 and the period v3 that are scanned vertically, the laser light irradiation of red, green, and blue light and the infrared laser light Both irradiation and irradiation are configured to be controlled to an on state. Thereby, both red, green and blue visible laser beams and infrared laser beams are irradiated.

  Also, the laser light irradiation of red, green, and blue visible light is controlled to be in the off state between the period h3 to the period h4 that is scanned horizontally and between the period v2 to the period v3 that is scanned vertically. In addition, irradiation with infrared laser light is controlled to be in an on state. Thereby, it is configured so that only visible laser light is irradiated without red, green and blue visible laser lights being irradiated.

  Next, the detection sensitivity of the infrared detector and the output of the infrared laser light with respect to the projection distance of the infrared laser light of the projector will be described with reference to FIGS.

  In the first embodiment, as shown in FIG. 7, the infrared laser light detection sensitivity of the infrared detectors 10a and 10b is increased as the projection distance from the projector 100 increases from position B to position C. It is assumed that it decreases in inverse proportion to the square. In this case, the detection sensitivity (s1) of the infrared detection units 10a and 10b at the position C is about 0.4 (about two-fifths) of the detection sensitivity (s2) of the infrared detection units 10a and 10b at the position B.

  Further, as shown in FIG. 8, the infrared laser beam is irradiated with the output increased in proportion to the square of the distance according to the projection distance from the infrared detectors 10a and 10b (projector 100). It is configured. That is, the infrared laser light is configured to be irradiated with an increased output so that the projection distance from the projector 100 increases from the position B to the position C in proportion to the square of the distance. The output (p1) of the infrared laser beam at the position C of the infrared laser beam is about 2.5 times the output (p2) at the position B.

  Next, the operation of the control unit 31 when the projector 100 detects the detection target will be described with reference to FIGS. 1, 3, 4, and 9 to 14.

  As shown in FIG. 1, red, green, and blue laser beams are emitted from red LD 61a, green LD 62a, and blue LD 63a (see FIG. 2), respectively, and the laser beam is scanned to scan table 1 and screen 2 Images 1a and 2a are projected on the top, respectively. For example, an image such as an icon is projected on the table 1 and the screen 2. Further, in synchronization with the red LD 61a, the green LD 62a, and the blue LD 63a, infrared laser light is emitted from the infrared LD 64a, and the laser light is scanned. As shown in FIG. 9, in step S1, it is determined whether or not the infrared laser light emitted from the infrared LD 64a and reflected by the detection target (touch pen) is detected by the infrared detectors 10a and 10b. . If the infrared laser light reflected by the detection target is not detected by the infrared detectors 10a and 10b, the operation of step S1 is repeated.

  If it is determined in step S1 that the infrared laser light reflected by the detection target is detected by the infrared detectors 10a and 10b, the process proceeds to step S2. In step S2, the coordinates of the image 1a scanned by the laser light emitted from the red LD 61a, the green LD 62a, and the blue LD 63a during the period in which the infrared detectors 10a and 10b detect the reflected light from the detection target (table) 1) is determined as the coordinates on the table 1 of the detection object.

  Next, it progresses to step S3 and the height from the table 1 of a detection target is calculated based on the intensity difference of the reflected light from the detection target detected by the infrared detectors 10a and 10b. Specifically, for example, as shown in FIG. 3, when the detection object (touch pen) touches the surface of the table 1, the intensity of reflected light from the detection object detected by the infrared detector 10a is: The intensity of the reflected light from the detection object detected by the infrared detector 10b provided at a position higher than that of the infrared detector 10a is increased because the distance to the detection object is small. On the other hand, as shown in FIG. 4, when the detection object (touch pen) is located away from the surface of the table 1, the intensity of the reflected light from the detection object detected by the infrared detector 10b is the infrared detector. The intensity of the reflected light from the detection object detected by the infrared detector 10a provided at a position lower than 10b is larger because the distance to the detection object is smaller. As described above, since the heights of the detection objects from the surface of the table 1 are different, the intensity of the reflected light detected by the infrared detectors 10a and 10b is different. Therefore, the reflected light detected by the infrared detectors 10a and 10b is different. The height of the detection object from the surface of the table 1 can be calculated based on the magnitude of the difference in intensity.

  Next, it progresses to step S4 and it is judged whether the detection target object touched the surface of the table 1 (whether the height from the surface of the table 1 of a detection target object is zero). If it is determined in step S4 that the detection object does not touch the surface of the table 1, the process returns to step S1. That is, the operations of Step S1 to Step S4 are repeated until the detection target object touches the surface of the table 1. If it is determined in step S4 that the detection object has touched the surface of the table 1, the process proceeds to step S5 to determine whether or not the detection object has moved in the horizontal direction on the surface of the table 1. . That is, as shown in FIG. 10, it is determined whether or not the detection object has moved on the surface of the table 1 while the height from the surface of the table 1 remains zero. If it is determined that the detection object has moved horizontally on the surface of the table 1, the process proceeds to step S6, and the pointer is moved in conjunction with the movement of the detection object as shown in FIG. The image to be projected is projected onto the table 1 and the screen 2. Then, it returns to step S1.

  If it is determined in step S5 that the detection target does not move on the surface of the table 1 in the horizontal direction, the process proceeds to step S7 to determine whether or not the detection target is separated from the surface of the table 1 (detection target). Whether or not the height of the object from the surface of the table 1 is greater than zero). Note that the coordinates of the detection target on the table 1 correspond to the icon image. If it is determined in step S7 that the detection target is separated from the surface of the table 1, the process proceeds to step S8, and whether or not the distance that the detection target is separated from the surface of the table 1 is a predetermined distance or more. Is judged. If it is determined in step S8 that the distance from which the detection object is separated from the surface of the table 1 is less than a predetermined distance (see state A in FIG. 12), the process proceeds to step S9, where the detection object (touch pen) is moved. It is determined that the icon projected on the table 1 is dragged. Then, as shown in FIG. 13, a video for dragging the icon is projected on the table 1 (screen 2). Thereafter, the icon image is moved in conjunction with the movement of the detection target (state B in FIG. 12). If it is determined in step S10 that the detection object has touched the surface of the table 1, it is determined in step S11 that the icon has been dropped. Then, an image for dropping the icon is projected on the table 1 (screen 2). Then, it returns to step S1.

  In step S8, when it is determined that the distance that the detection target is separated from the surface of the table 1 is equal to or greater than a predetermined distance (see FIG. 14), the detection target (touch pen) is projected onto the table 1 Is determined to have been released. Then, it returns to step S1.

  In the first embodiment, as described above, the infrared laser light emitted from the infrared LD 64a is compared with the projection ranges of the red, green, and blue visible laser lights emitted from the red LD 61a, the green LD 62a, and the blue LD 63a. Is irradiated with red, green and blue visible laser beams and infrared laser beams obliquely downward from above the projector 100, the infrared laser beams are red, green and Since irradiation is performed above the height at which the blue visible laser beam is irradiated, the infrared laser beam is also applied to a relatively high region of the image far from the projector 100 in the image projected on the table 1. Irradiated. Thereby, the position of the detection target in the height direction can be detected in almost the entire area of the projection screen.

  In the first embodiment, as described above, the red LD 61a, the green LD 62a and the blue LD 63a in the projected range of the visible laser beam of red, green and blue, and the end portions in the direction away from the blue LD 63a and the red, green and blue For the visible laser beam projection range of the red, green, and blue visible laser beam irradiation side, the infrared laser beam is red, green, and blue visible laser beam. If irradiation is performed in a range larger than the projection range, red, green and blue visible laser beam projection ranges of red LD 61a, green LD 62a and blue LD 63a away from the ends (arrow Y1 direction) and red, green And blue and blue visible light at the end of the side (arrow X1 direction and arrow X2 direction) with respect to the irradiation direction of the laser light (arrow Y1 direction). Since the infrared laser beam is irradiated above the height at which the blue visible laser beam is irradiated, the red LD 61a, the green LD 62a and the blue LD 63a in the projection range of the red, green and blue visible laser beams. The position in the height direction of the detection target (touch pen) at the end away from the center, and the irradiation direction of the red, green, and blue visible laser beams in the projection range of the red, green, and blue visible laser beams Since the position in the height direction of the detection target object (touch pen) at the side end with respect to the can be detected, the position in the height direction of the detection target object can be more reliably detected in almost the entire area of the projection screen. it can.

  In the first embodiment, as described above, if the infrared laser beam is irradiated in a range larger than the projected range of the red, green, and blue visible laser beams, the detection target (touch pen) is positioned. In this case, since the infrared laser beam reflected by the detection object (touch pen) is detected by the infrared detector 10b, the infrared detector at the end of the projection range of the red, green and blue visible light laser beams. The position in the height direction of the detection object (touch pen) in the area corresponding to the height position of 10b can be detected.

  In the first embodiment, as described above, if the output of the infrared laser light is changed so as to be proportional to the square of the distance according to the distance from the infrared detectors 10a and 10b, for example, Even when the detection sensitivity of the infrared detectors 10a and 10b decreases in inverse proportion to the square of the distance according to the distance from the infrared detectors 10a and 10b, the detection target (touch pen) can be easily detected.

  In the first embodiment, as described above, the red, green, and blue visible laser beams emitted from the red LD 61a, the green LD 62a, and the blue LD 63a and the infrared laser beam emitted from the infrared LD 64a are commonly used. If the MEMS mirror 69a is used to irradiate a range larger than the projected range of the red, green, and blue visible laser beams, for example, the first laser beam emitted from the first laser beam generator is projected onto the projection area. Unlike the case of separately providing a projection unit that projects onto the projection area and a projection unit that projects the second laser light emitted from the second laser beam generation unit onto the projection region, the structure can be simplified.

  In the first embodiment, as described above, by controlling the OFF state of the red, green, and blue visible laser beams in a predetermined period of the period in which the common signal is activated, If the infrared laser beam illuminates a range larger than the projected range of red, green and blue visible laser beams, it is easy to control the off state of the red, green and blue visible laser beams. In addition, it is possible to irradiate only the infrared laser beam to the outer region of the red, green, and blue visible laser beams using one common signal, so that the red, green, and blue visible laser beams Even when the projection range of the infrared laser beam is different from that of the laser beam, it is possible to prevent the control from becoming complicated.

  Further, in the first embodiment, as described above, the width of the irradiation range of the region exceeding the projection range of the red, green, and blue visible laser beams among the irradiation ranges of the infrared laser beams is set to be red, green, and If the width is smaller than the projection range of the blue visible laser beam, the detection object (touch pen) positioned far away from the red, green, and blue visible laser projection ranges is not detected. In addition, it is possible to detect a detection target (touch pen) in the vicinity of the projection range of the red, green, and blue visible laser beams.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 15 and 16. In the second embodiment, the infrared laser light is irradiated with the output changed in proportion to the square of the distance according to the projection distance from the infrared detectors 10a and 10b (projector 100). In contrast, an example will be described in which infrared laser light is irradiated with the output linearly increased in accordance with the projection distance from the infrared detectors 10a and 10b (projector 100). The configuration of the second embodiment is the same as that of the first embodiment.

  In the second embodiment, as shown in FIG. 15, the infrared laser light detection sensitivities of the infrared detectors 10 a and 10 b are linear as the projection distance from the projector 100 increases from position B to position C. It shall be reduced to In this case, the detection sensitivity (s3) of the infrared detection units 10a and 10b at the position C is about one half of the detection sensitivity (s4) of the infrared detection units 10a and 10b at the position B.

  Further, as shown in FIG. 16, the infrared laser beam is configured to be irradiated with the output linearly increased in accordance with the projection distance from the infrared detectors 10a and 10b (projector 100). That is, the infrared laser beam is configured to be irradiated with a linearly increased output as the projection distance from the projector 100 increases from the position B to the position C. The output (p3) of the infrared laser beam at the position C of the infrared laser beam is approximately twice the output (p4) at the position B.

  In the second embodiment, as described above, if the output of the infrared laser light is linearly increased in accordance with the distance from the infrared detectors 10a and 10b and irradiated, for example, detection by the infrared detectors 10a and 10b is performed. Even when the sensitivity decreases linearly according to the distance from the infrared detectors 10a and 10b, the detection target (touch pen) can be easily detected. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, an example in which an image is projected by irradiating laser beams of three colors of red, green, and blue has been described. However, the present invention is not limited to this. For example, an image may be projected with laser light of one color or two colors, or an image may be projected with laser light of four or more colors.

  Moreover, although the example which detects the position (coordinate) of a detection target object by irradiating an infrared laser beam was shown in the said 1st and 2nd embodiment, this invention is not limited to this. For example, the position (coordinates) of the detection target may be detected by laser light (invisible light) that does not contribute to image projection other than infrared laser light.

  In the first and second embodiments, an example in which two infrared detectors are provided in the projector has been described. However, the present invention is not limited to this. For example, the projector may be provided with one or more infrared detectors.

  In the first and second embodiments, the photodiode is shown as an example of the infrared detector, but the present invention is not limited to this. For example, a CMOS sensor or a CCD sensor may be applied in addition to the photodiode.

  In the first and second embodiments, examples in which red, green, and blue visible laser light and infrared laser light are scanned both in the horizontal direction and in the vertical direction by one MEMS mirror 69a are shown. However, the present invention is not limited to this. For example, red, green and blue visible laser beams and infrared laser beams may be scanned by two MEMS mirrors 69a and 69b as in the first modification shown in FIG. In this case, one of the MEMS mirrors 69a or 69b may function as a horizontal scanning mirror, and the other of the MEMS mirrors 69a or 69b may function as a vertical scanning mirror.

  In the first and second embodiments, an example in which red, green, and blue visible laser beams and infrared laser beams are scanned by a common MEMS mirror is shown. However, the present invention is not limited to this. I can't. For example, as in the second modification shown in FIG. 18, a laser light source 60a that irradiates red, green, and blue visible light laser beams and a laser light source 60b that irradiates infrared laser light are separately configured. Alternatively, the red, green, and blue visible laser beams and the infrared laser beam may be separately scanned using the separate MEMS mirror 69a.

  In the first and second embodiments, the output of the infrared laser beam is increased linearly or proportional to the square of the distance, but the present invention is not limited to this. For example, the output of the infrared laser may be increased stepwise.

  In the first and second embodiments, the infrared laser light is visible in red, green, and blue with respect to the arrow Y1, X1, and X2 directions of the projection range of the red, green, and blue visible laser light. Although the example which irradiates the range larger than the projection range of the laser beam of light was shown, this invention is not limited to this. For example, infrared laser light is projected from the laser light projection range of red, green, and blue visible light with respect to the arrow Y1, Y2, X1, and X2 directions of the laser light projection range of red, green, and blue visible light. May also irradiate an infrared laser beam with respect to one of the arrow Y1, X1 and X2 directions of the projection range of red, green and blue visible laser beams. Alternatively, a range larger than the projected range of the blue visible laser beam may be irradiated.

  In the first and second embodiments, the width W1 and the width W3 of the irradiation range of the infrared laser light are respectively set to the width W2 and the width W4 of the projection range of the red, green, and blue visible light laser beams. However, the present invention is not limited to this. For example, the width W1 and the width W3 of the irradiation range of the infrared laser beam may be the same as the width W2 and the width W4 of the projection range of the red, green, and blue visible laser beams, respectively. The width W1 and the width W3 of the laser light irradiation range may be larger than the width W2 and the width W4 of the red, green, and blue visible light laser light projection ranges, respectively.

10a Infrared detector (first detector)
10b Infrared detector (second detector)
61a Red LD (first laser beam generator)
62a Green LD (first laser beam generator)
63a Blue LD (first laser beam generator)
64a Infrared LD (second laser beam generator)
69a MEMS mirror (projection unit)
100 projector

Claims (10)

A first laser beam generator for irradiating a visible first laser beam for image projection;
A second laser beam generator that does not contribute to image projection and irradiates a second laser beam for detecting a detection object;
The second laser light that is disposed below the first laser light generation unit and the second laser light generation unit and is reflected by the detection object among the second laser light emitted from the second laser light generation unit. A detection unit that detects a height position from the projection region of the detection object by receiving a laser beam;
The second laser light irradiated from the second laser light generation unit is configured to irradiate a range larger than the projection range of the first laser light irradiated from the first laser light generation unit. ,projector.   The second laser light includes an end of the projection range of the first laser light irradiated from the first laser light generation unit in a direction away from the first laser light generation unit, and a projection range of the first laser light. The projector according to claim 1, wherein the projector is configured to irradiate a side end portion with respect to the irradiation direction of the first laser light of a range larger than a projection range of the first laser light. The detection unit includes a first detection unit and a second detection unit provided above the first detection unit,
The second laser beam irradiates a range that is larger than the projection range of the first laser beam, and thereby corresponds to the height position of the second detection unit at the end of the projection range of the first laser beam. The projector according to claim 1, wherein the projector is configured to irradiate a light beam.   The laser beam that irradiates a range other than the projection range of the first laser beam in the second laser beam has a larger output than the laser beam that irradiates the projection range of the first laser beam in the second laser beam. The projector according to claim 1, wherein the projector is configured to be irradiated. The second laser light generation unit and the detection unit are disposed on the same side in a plan view,
The projector according to claim 4, wherein the second laser light emitted from the second laser light generation unit is configured to be emitted with an output increased in accordance with a distance from the detection unit.   The projector according to claim 5, wherein the second laser light is configured to be irradiated with an output changed in proportion to a square of the distance according to a distance from the detection unit.   The projector according to claim 5, wherein the second laser light is configured to be irradiated with an output that linearly increases in accordance with a distance from the detection unit. A common projection unit that projects the first laser beam emitted from the first laser beam generator and the second laser beam emitted from the second laser beam generator onto the projection region;
The first laser light emitted from the first laser light generation unit and the second laser light emitted from the second laser light generation unit use the common projection unit, and the second laser light is The projector according to claim 1, wherein the projector is configured to irradiate a range larger than a projection range of the first laser light. The first laser light emitted from the first laser light generator and the second laser light emitted from the second laser light generator are configured to be irradiated based on a common signal,
In the predetermined period of the period in which the common signal is activated, the first laser light is controlled to be in an off state, so that the second laser light is more than the projection range of the first laser light. The projector according to claim 1, wherein the projector is configured to irradiate a large range.   The width of the irradiation range of the region exceeding the projection range of the first laser light in the irradiation range of the second laser light is configured to be smaller than the width of the projection range of the first laser light. Item 10. The projector according to any one of Items 1 to 9.

Images