JP2015158558A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prompt a user to properly install an electromagnetic wave irradiation part for position detection to a projection surface of a projector.SOLUTION: A projector includes a projection part that projects images, an electromagnetic wave irradiation part that radiates electromagnetic waves, an electromagnetic wave detection part that detects an electromagnetic wave reflected on an object, a position measuring part that measures the position of the object on the basis of the detected electromagnetic wave, an installation state detection part that detects the installation state of the electromagnetic wave irradiation part, and a control part that controls whether or not to radiate the electromagnetic wave on the basis of the detected installation state.

Description

  The present invention relates to a projector.

As disclosed in Patent Document 1, a contact position of a finger or a stick with respect to a projection surface is detected by an infrared laser and an infrared sensor, and the detected contact position is expressed by coordinates of a projection image. There is known a bidirectional projector that reflects the contact and the locus thereof on a projected image.

JP 2013-206373 A

In order to represent the contact position of the fingertip or the stick with respect to the projection surface by the coordinates of the projection image, calibration for specifying the conversion parameters between the coordinates of the infrared sensor and the coordinates of the projection image is required.
However, if the infrared laser is not properly installed on the projection surface, even if the infrared laser is activated, the contact position of the fingertip or stick on the projection surface cannot be detected, or the calibration fails. There is.

The present invention was created in order to solve such a problem, and aims to prompt the user to appropriately install an electromagnetic wave irradiation unit for position detection with respect to the projection surface of the projector. I will.

(1) A projector for achieving the above object includes: a projection unit that projects an image; an electromagnetic wave irradiation unit that radiates electromagnetic waves; an electromagnetic wave detection unit that detects the electromagnetic waves reflected by an object; and the detected electromagnetic waves A position measuring unit for measuring the position of the object based on the installation state detecting unit for detecting the installation state of the electromagnetic wave irradiation unit, and controlling whether or not to irradiate the electromagnetic wave based on the detected installation state A control unit.

According to the present invention, since the irradiation of electromagnetic waves is controlled according to whether or not the installation state of the electromagnetic wave irradiation unit is appropriate, the user is prompted to appropriately install the electromagnetic wave irradiation unit on the projection surface of the projector. be able to. That is, when the installation state of the electromagnetic wave irradiation unit is inappropriate, the electromagnetic wave irradiation unit can be appropriately installed on the projection surface of the projector.

(2) In the projector for achieving the above object, the control unit may control whether to calibrate the position measurement unit based on the detected installation state.
When this configuration is adopted, inappropriate calibration can be prevented.

(3) In the projector for achieving the above object, the installation state detection unit may detect a contact state between the bottom surface of the electromagnetic wave irradiation unit and the installation surface.
When this configuration is adopted, it is possible to detect a state where the user has the electromagnetic wave irradiation unit in his / her hand and a state where the bottom surface of the electromagnetic wave irradiation unit is not in contact with the installation surface with a simple configuration.

(4) The projector for achieving the above object may further include a notification unit that notifies the abnormality based on the detected installation state.
When this configuration is adopted, it is possible to explicitly notify the user so that the electromagnetic wave irradiation unit is appropriately installed on the projection surface of the projector.

(5) In the projector for achieving the above object, the electromagnetic wave may be an infrared laser beam.
When this configuration is adopted, since the optical system can be used, the electromagnetic wave irradiation unit and the electromagnetic wave detection unit can be downsized as compared with the case of using radio waves such as millimeter waves.

(6) In the projector for achieving the above object, the installation state detection unit includes an imaging unit that images a predetermined direction with respect to the projection unit, and the digital image captured and output by the imaging unit Based on this, the position or irradiation direction of the electromagnetic wave irradiation unit with respect to the region where the projection unit projects an image may be detected.
When this configuration is adopted, the position or irradiation direction of the electromagnetic wave irradiation unit in the direction parallel to the irradiation surface of the projector can be detected.

Note that the function of each means described in the claims is realized by a hardware resource whose function is specified by the configuration itself, a hardware resource whose function is specified by a program, or a combination thereof. The functions of these means are not limited to those realized by hardware resources that are physically independent of each other.

The perspective view concerning the embodiment of the present invention. The perspective view concerning the embodiment of the present invention. The block diagram concerning embodiment of this invention. The schematic diagram concerning embodiment of this invention. The flowchart concerning embodiment of this invention. The perspective view concerning other embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the corresponding component in each figure, and the overlapping description is abbreviate | omitted.
1. Overview As shown in FIGS. 1 and 2, a projector according to an embodiment of the present invention includes a main body 1 and a light curtain unit 2. The main body 1 is installed on the ceiling C, the wall W, the desk T, etc., and projects an image. The light curtain unit 2 is installed on a wall W, a desk T, or the like that becomes a projection surface of the main body 1, irradiates infrared laser light, and detects infrared rays reflected by the indicator O as an object, thereby preventing the projection surface from being projected. The contact position of the indicator O is measured. When the tip of the indicator O such as a fingertip, pen, or indicator stick contacts the projection surface and the position of the indicator O is detected by the light curtain unit 2, the main body 1 overwrites the projected image or changes the mode. To do. For example, characters corresponding to the contact locus of the indicator O are displayed in a superimposed manner on a chart displayed in the projection area S according to the image data to be projected. Since the main body 1 and the light curtain unit 2 are separate bodies,
Whenever the main body 1 and the light curtain unit 2 are installed, calibration is required to associate the coordinates of the indicator O detected by the light curtain unit 2 with the coordinates of the image projected by the main body 1. Such calibration must be performed with the light curtain unit 2 properly installed. Therefore, in this embodiment, the installation state of the light curtain unit 2 is detected, and based on the detected installation state, the operation of the light curtain unit 2 such as irradiation with infrared laser light or execution of calibration is controlled.

2. Configuration of Light Curtain Unit As shown in FIG. 3, the light curtain unit 2 includes infrared lasers 201 and 203, infrared light receiving units 202 and 204, a position measuring unit 21, an installation state detecting unit 22, a power supply unit 23, and the like. Infrared lasers 201 and 203 as electromagnetic wave irradiation units irradiate laser beams having infrared wavelengths from different positions. When the light curtain unit 2 is properly installed, the irradiation directions of the infrared lasers 201 and 203 are substantially parallel to the wall W and the surface of the desk T on which the projection area S is formed by the main body 1. The direction passes between S and the main body 1. Infrared light receivers 202 and 204 serving as electromagnetic wave detectors are infrared sensors that receive infrared light at different positions and output a signal corresponding to the intensity of the received infrared light. By using an electromagnetic wave having an infrared wavelength, an optical system can be used for the electromagnetic wave irradiation unit and the electromagnetic wave detection unit without impairing the relative brightness of the image projected by the main body 1. Can be miniaturized. The position measurement unit 21 includes a processor, a main memory, an input / output interface, and an external memory (not shown). The position measurement unit 21 measures the position of the indicator O based on the outputs of the infrared light receiving units 202 and 204 by executing a measurement program stored in the external storage. The distance from the infrared laser 201 through the indicator O to the infrared receiver 202 and the infrared receiver 20 from the infrared laser 203 through the indicator O
The distance to 4 differs depending on the position of the indicator O. Therefore, the position measuring unit 21 includes a time until the infrared light irradiated from the infrared laser 201 enters the infrared light receiving unit 202 through the indicator O, and the infrared light receiving unit through which the infrared light irradiated from the infrared laser 203 passes through the indicator O. 2
The position of the indicator O is measured based on the difference from the time until the light enters 04, and a position signal indicating the position of the indicator O is output to the main body 1.

As shown in FIG. 4, the installation state detection unit 22 includes a bottom surface and a wall W of the light curtain unit 2.
A plurality of contact sensors 221 for detecting a contact state with an installation surface such as a desk T are provided. The contact sensor 221 may be any sensor that can distinguish between a contact state and a non-contact state, and may be a mechanical type such as a push button switch, a pressure-sensitive type, or a non-contact type. For example, by providing the contact sensors 221 in three protruding positions on the bottom surface of the light curtain unit 2, it is possible to detect a state in which the bottom surface of the light curtain unit 2 is inclined with respect to the installation surface. When the contact sensor 221 is separated from the installation surface, the installation state detection unit 22 outputs a signal corresponding to the state to the position measurement unit 21. The position measurement unit 21 sets the installation state signal to “abnormal” when one or more contact sensors 221 are separated from the installation surface, and the installation state signal when all the contact sensors 221 are in contact with the installation surface. Set to “Normal”.

3. Configuration of Main Body The main body 1 includes a light source 17, a liquid crystal light valve 10, and a dichroic mirror 100 shown in FIG.
, Dichroic prism 101, lens 102, concave mirror 103, liquid crystal driving unit 11, OSD processing unit 12, image signal processing unit 13, image signal input unit 14, control unit 15, external storage 151, light source driving unit 16, shown in FIG. An operation unit 18, a power supply unit 19 and the like are provided. The light source 17 is composed of a high-pressure mercury lamp, LED, laser, or the like, and is driven by the light source driving unit 16.
Various image signals are input to the image signal input unit 14 from an external device. Image signal processor 1
3 generates image data corresponding to a projection state based on an image signal input from an external device. The OSD processing unit 12 synthesizes image data based on an image signal input from an external device and image data representing characters and the like generated by the control unit 15. The liquid crystal drive unit 11 converts the image data output from the OSD processing unit 12 into an analog signal for driving each pixel of the liquid crystal light valve 10. The liquid crystal light valve 10 includes three liquid crystal panels 10a, 10b, and 10c that control the transmittance of light of red, green, and blue wavelengths emitted from the light source 17 and separated by the dichroic mirror 100 for each pixel. As shown in FIG. 4, the light transmitted through the liquid crystal light valve 10 is synthesized by the dichroic prism 101, and the lens 1
02 and the concave mirror 103 form an image on a projection surface such as a wall W or a desk T. The control unit 15 serving as a notification unit generates image data based on the position signal output from the light curtain unit 2 by executing a control program stored in the external storage 151 and outputs the image data from the light curtain unit 2. Each part of the main body 1 and the light curtain unit 2 are controlled based on the installed state signal. The operation unit 18 inputs various instructions to the control unit 15. The main body 1 and the light curtain unit 2 can communicate with each other by wire or wirelessly.

4). Light Curtain Unit Installation Abnormality Detection Processing Next, the light curtain unit 2 installation abnormality detection processing will be described with reference to FIG. The installation abnormality detection process may be executed periodically or in response to an interruption from the installation state detection unit 22.

The position measuring unit 21 of the light curtain unit 2 determines whether or not the installation state of the light curtain unit 2 is abnormal based on the output of the installation state detection unit 22 (S1). When the installation state of the light curtain unit 2 is normal, the installation abnormality detection process ends.

When the installation state of the light curtain unit 2 is abnormal, the position measurement unit 21 sets the installation state signal to “abnormal”, stops the infrared lasers 201 and 203, and stops the position measurement (S2).

When the position measurement unit 21 sets the installation state signal to “abnormal”, the main body 1 projects a warning message (S3). Specifically, for example, when the control unit 15 acquires the “abnormal” installation state signal output from the position measurement unit 21, a character string for notifying the user that the installation state of the light curtain unit 2 is abnormal. Is rasterized, and image data for displaying a warning message is output to the OSD processing unit 12. As a result, the main body 1 projects a character string for notifying the user that the installation state of the light curtain unit 2 is abnormal.
Thereby, the user is prompted to appropriately install the light curtain unit 2 with respect to the projection surface of the main body 1. The warning message may be projected on an image based on the image signal input from the external device, or the projection content may be switched from the image based on the image signal input from the external device to the warning message.

When the installation state of the light curtain unit 2 is abnormal, the position measurement unit 21 determines whether or not the installation state of the light curtain unit 2 is normal until all the contact sensors 221 are in contact with the installation surface. Continue (S4).

When the installation state of the light curtain unit 2 becomes normal, the position measurement unit 21 of the light curtain unit 2 sets the installation state signal to “normal”, activates the infrared lasers 201 and 203, and measures the position of the indicator O. It resumes (S5).

When the installation state of the light curtain unit 2 becomes normal, the control unit 15 of the main body executes calibration of the light curtain unit 2 (S6). Specifically, for example, when the installation state signal acquired by the control unit 15 from the position measurement unit 21 changes from “abnormal” to “normal”,
The control unit 15 projects a mark indicating a position where the user should contact the tip of the indicator O and a message prompting the user to touch the mark with the tip of the indicator O on the projection surface. When the user brings the tip of the indicator O into contact with the mark, the position measuring unit 21 detects the contact position based on the outputs of the infrared light receiving units 202 and 204. As a result, the control unit 15 acquires the coordinates of the position measurement unit 21 corresponding to the display position of the mark from the position measurement unit 21. The control unit 15 determines the coordinates of the indicator O detected by the light curtain unit 2 and the coordinates of the image projected by the main body 1 based on the coordinates of the mark in the projected image and the coordinates acquired from the position measurement unit 21. Can be associated.

According to the embodiment described above, the installation state detector 22 on the bottom surface of the light curtain unit 2.
Since the contact sensor 221 is provided, an abnormal state where the infrared laser light emitted from the infrared lasers 201 and 203 and the projection surface of the main body 1 are not parallel can be detected with a simple configuration. When the light curtain unit 2 is in an abnormal installation state, the infrared laser light is not emitted from the infrared lasers 201 and 203, so that the user can be prompted to install the light curtain unit 2 appropriately. Further, when the light curtain unit 2 is in an abnormal installation state, a warning message for notifying the user of the abnormality is projected by the main body 1 so that the user can more reliably recognize the light curtain unit installation abnormality. Can do. Further, it is possible to prevent the user from being irradiated with infrared laser light when the user moves the light curtain unit 2. Further, since the calibration is not performed when the installation state of the light curtain unit 2 is abnormal, it is possible to prevent inappropriate calibration from being performed.

5. Other Embodiments The technical scope of the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

For example, in order to project an image, the light may be modulated using a single liquid crystal panel, the light may be modulated using a reflective liquid crystal panel, or a DMD (Digital Mirror Device) may be used. The light may be modulated. Further, for example, a convex mirror may be used to enlarge and project a projected image, or a mirror may not be used.

An electromagnetic wave having a wavelength different from that of infrared rays such as a microwave may be used as an electromagnetic wave for detecting the indicator. Further, the electromagnetic wave may traverse the entire projection area while moving the irradiation direction of the linear electromagnetic wave, or a planar electromagnetic wave that traverses the entire projection area may be irradiated. As a method for measuring the position of the indicator, a known radar method such as an unmodulated continuous wave radar, a frequency modulated continuous wave radar, a phase modulated continuous wave radar, or a pulse radar can be applied.

Further, a magnetic sensor that detects geomagnetism, a posture sensor that detects gravity, or the like may be used as a sensor that detects the installation state of the light curtain unit 2.

The calibration method may be any method as long as a specific position on the projection area and a position at which the indicator contacts the projection surface can be associated with the user.

In addition, the abnormal installation state may be notified by a warning sound, or may be notified by a display or an indicator provided in the main body or the light curtain unit.

In the above embodiment, the state in which the irradiation direction of the infrared laser beam is not parallel to the projection surface is detected as an abnormal installation state. However, as described below, the position or irradiation direction of the light curtain unit with respect to the projection area Also, an abnormal installation state may be detected.

In order to detect the position or irradiation direction of the light curtain unit 2 with respect to the projection area S, for example, as shown in FIG. 6, marks 27a and 27b that can be optically recognized are provided on the upper surface of the light curtain unit 2. The main body 1 is provided with a digital camera 26 as an imaging unit. The digital camera 26 may be provided so that the area near the projection area S where the light curtain unit 2 is to be installed falls within the angle of view with reference to the projection direction. When the light curtain unit 2 is installed at an appropriate position with respect to the projection area S in an appropriate direction, marks 27 a and 27 b appear in the image data output from the digital camera 26. The position and angle of view of the digital camera 26 are fixed with respect to the projection area S. Therefore, by analyzing the image data output from the digital camera 26 and specifying the positions and orientations of the marks 27a and 27b, the position and irradiation direction of the light curtain unit 2 with respect to the projection area S can be detected. If the detected position and irradiation direction of the light curtain unit 2 are not appropriate for the projection area S, it may be detected that the installation state of the light curtain unit 2 is abnormal. In this way, the user is prompted to properly install the light curtain unit 2 by detecting the installation state of the light curtain unit 2 and controlling whether or not to irradiate the infrared laser according to the detection result. It is also possible to prevent the user from being irradiated with infrared laser light when the user is moving the light curtain unit 2.

In place of the digital camera 26, the main body 1 is used for keystone correction and autofocusing.
You may use the imaging device with which it is equipped as an imaging part. Further, an imaging device used for detecting the position of the indicator by a method other than the light curtain may be used as the imaging unit.

DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Light curtain unit, 10 ... Liquid crystal light valve, 10a ... Liquid crystal panel, 10b ... Liquid crystal panel, 10c ... Liquid crystal panel, 11 ... Liquid crystal drive part, 12 ... OSD process part,
DESCRIPTION OF SYMBOLS 13 ... Image signal processing part, 14 ... Image signal input part, 15 ... Control part, 16 ... Light source drive part, 17
... light source, 18 ... operation part, 19 ... power supply part, 21 ... position measuring part, 22 ... installation state detection part, 23
DESCRIPTION OF SYMBOLS ... Power supply part 26 ... Digital camera 27a ... Mark 27b ... Mark 100 ... Dichroic mirror 101 ... Dichroic prism 102 ... Lens 103 ... Concave mirror 1
DESCRIPTION OF SYMBOLS 51 ... External memory, 201 ... Infrared laser, 203 ... Infrared laser, 202 ... Infrared light receiver, 204 ... Infrared light receiver, 221 ... Contact sensor, C ... Ceiling, O ... Indicator, S ... Projection area, T ... Desk, W ... wall

Claims (6)

A projection unit for projecting an image;
An electromagnetic wave irradiation unit for irradiating electromagnetic waves;
An electromagnetic wave detection unit for detecting the electromagnetic wave reflected by the object;
A position measuring unit for measuring the position of the object based on the detected electromagnetic wave;
An installation state detection unit for detecting the installation state of the electromagnetic wave irradiation unit;
A control unit for controlling whether to irradiate the electromagnetic wave based on the detected installation state;
A projector comprising: The control unit controls whether or not to calibrate the position measurement unit based on the detected installation state;
The projector according to claim 1. The installation state detection unit detects a contact state between the bottom surface of the electromagnetic wave irradiation unit and the installation surface.
The projector according to claim 1 or 2. A notification unit for notifying the abnormality based on the detected installation state;
The projector according to any one of claims 1 to 3. The electromagnetic wave is an infrared laser beam,
The projector according to any one of claims 1 to 4. The installation state detection unit includes an imaging unit that images a predetermined direction with respect to the projection unit,
Based on image data captured and output by the imaging unit, the projection unit detects a position or an irradiation direction of the electromagnetic wave irradiation unit with respect to a region where an image is projected.
The projector according to any one of claims 1 to 5.

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