JP2003108309A - Presentation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a presentation system that can establish safety while using laser light of good visibility, and also can restrict the unintentional movement of hands and correspond to a multi-screen or the like. SOLUTION: When infrared light is projected from a pointer 3 onto a screen 10, an operation part seeks the position of the infrared light on the screen 10 from the image taken with an imaging means. The operation part computes the emerging angle of the laser light from the sought position of the infrared light, and a laser projection means 5 emits the laser light at the computed emerging angle. Therefore, the point of the laser light is projected onto the position of the infrared light projected with an indicating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presentation system which uses a projector such as a liquid crystal projector or the like to indicate a point on a screen by laser light, and more particularly to the development of new point display means.

[0002]

2. Description of the Related Art When a presentation such as a lecture is given using a liquid crystal projector, a laser pointer that projects a laser beam to clearly indicate a point on a screen is often used. Such a laser pointer has drawbacks in that hand shake is largely reflected and it is difficult to stabilize the point, or erroneous projection of laser light causes the laser pointer to enter the eyes of the audience and pose a danger.

Therefore, various proposals have been made in the past for solving these problems. For example, JP-A-8-2861
According to Japanese Patent Publication No. 47 (1), a rotating disk having a plurality of refraction grids for refracting a laser beam is rotated by a drive motor, and the gyro effect of the rotating disk reduces hand shake. As a safety measure, as disclosed in Japanese Patent Laid-Open No. 10-4228 (2), laser light projection is automatically turned on according to the brightness of a laser light projection target (screen or the like). / OFF
However, it has been proposed to project the laser light only when the light exceeds a certain threshold and is bright. In addition, JP-A-2000-
Japanese Patent No. 321530 (3) discloses a technique of detecting a vertical or horizontal angle and projecting a laser beam only when the angle is within a predetermined range.

[0004]

According to the laser pointer described in the above publication (1), since the number of parts is relatively large, the weight is heavy and it is difficult to reduce the size, and the laser pointer resists the moment generated by the rotating disk. It is not easy to use because it requires you to operate it. Also,
The safety measures according to the above-mentioned gazettes (2) and (3) cannot be a fundamental measure because the laser beam is projected if a case where the device does not operate properly occurs. On the other hand, the laser pointer has an advantage that the visibility of the point is good. Therefore, a presentation system having safety while using laser light has been demanded. Further, in any of the conventional techniques, if there is a demand for a large-scale presentation that is performed while projecting the same image on a plurality of screens and simultaneously projecting points on those screens, a so-called multi-screen presentation,
I couldn't handle it.

Thus, the present invention provides a presentation system which can establish safety while using a laser beam with good visibility, can prevent hand shake, and can be applied to multiple screens. It is intended to be provided.

[0006]

A presentation system according to the present invention comprises screen means, instruction means for projecting invisible light on the screen means, photographing means for photographing the invisible light projected on the screen means, and this photographing means. It is characterized in that it is provided with a calculating means for obtaining the position of the invisible light photographed by the means on the screen means, and a laser projecting means for projecting laser light to the position obtained by the calculating means.

In the above-mentioned presentation system, the position of the invisible light photographed by the photographing means on the screen means is obtained by the calculation means, and the laser beam is projected to that position by the laser projection means. It is possible to project points at any place. Also,
In the present invention, although the laser beam is used, it is not emitted from the pointing device, and therefore, the laser beam is safe from being projected to the audience by the careless operation of the pointing device. Furthermore, since the pointer is projected at the position obtained by the calculation means, the camera shake can be prevented by controlling the pointer so that it does not move unless the position moves by a predetermined amount or more. Moreover, by distributing the position information of the pointer to the plurality of laser projecting means, it is possible to project the laser light on the plurality of screen means, and it is possible to deal with a multi-screen.

Here, in the present invention, it is possible to give a presentation while describing an image or the like on the imitation paper or the like and providing it on the screen means and pointing it with the instruction means. Alternatively, an image can be projected by an image projection means such as a liquid crystal projector. In this case, it is preferable to provide a light projecting / receiving unit including a photographing unit and a laser projecting unit separately from the image projecting unit. Thus, the light projecting / receiving unit can be arranged closer to the screen unit than the image projecting unit, and the risk of a person passing between the laser projecting unit and the screen unit is reduced and the safety is further improved.

Further, the laser projection means is provided with infrared detection means for detecting infrared rays emitted by the human body, and an interlock mechanism for prohibiting projection of the laser light when the infrared rays are detected in the laser light projection direction side. Further increases safety. As such an infrared sensor, a pyroelectric infrared sensor is most suitable for human body detection.

If a finder, an autofocus mechanism and a zoom mechanism are provided in the photographing means, the initial setting becomes easy. That is, at the time of initial setting, the screen means and the image are enlarged to the maximum extent in the field of view of the finder so that at least the size of the screen means or the like in the vertical direction or the horizontal direction is matched with the visual field. Then, invisible light such as infrared light is projected from the pointing means to the four corners of the screen means, and the contours of the screen means are stored in the computing means from these reference points. In this case, since the reference points substantially coincide with the edges of the visual field, the calculation means can quickly and accurately determine the positional information of the reference point in the visual field.

In the presentation, when invisible light is projected on the screen means by the instructing means, the calculating means obtains the relative position of the instructing point on which the invisible light is projected with respect to the reference point as coordinates, and also performs the autofocus. The emission angle of the laser light projected from the laser projection means can be obtained from the distance information to the screen means obtained from the mechanism and the position information of the designated point in the visual field. The initial setting may be performed based on the image projected on the screen unit by the projecting unit.

A CCD can be used as the photographing means, but it is convenient to use a four-division type photodiode (PSD) which does not require complicated data processing. In this photodiode, the value of the current flowing out from the four sides changes according to the position of the light incident on its surface, and it is possible to easily obtain the two-dimensional information of the incident light.

In order to control the projection direction of the laser beam in the laser projection means, various known means can be adopted. For example, in a configuration in which the laser generation mechanism is rotated in the X-axis direction and the Y-axis direction respectively, or in a configuration in which laser light emitted from the laser generation mechanism is projected through two reflection mirrors, one of the reflection mirrors is in the X-axis direction. To the other reflector Y
It is possible to use an axially rotatable member. Alternatively, in the configuration in which the laser light emitted from the laser generation mechanism is projected through the optical fiber, it is possible to employ a configuration in which the tip end portion of the optical fiber is rotated in the X-axis direction and the Y-axis direction, respectively.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Configuration of Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a schematic diagram showing the entire presentation system of the embodiment. In FIG. 1, reference numeral 1 is a liquid crystal projector (projection means), and the liquid crystal projector 1
Is a screen (screen means) 1 provided in the front
The image displayed on the CRT of the personal computer 4 is projected on 0. Reference numeral 3 is a pointer (instructing means), and the pointer 3
Are configured to project infrared light onto the screen 10.

In FIG. 1, reference numeral 2 is a light projecting / receiving section, and the light projecting / receiving section 2 is arranged on the screen side of the liquid crystal projector 1. The light projecting / receiving unit 2 includes a photographing unit having a four-division photodiode (PSD) for photographing the screen 10, and a laser projecting unit 5 for projecting the laser light L onto the screen 10. The light projecting / receiving unit 2 also has a finder 20 for visually recognizing an image captured by the image capturing means.
It has an auto focus mechanism and a zoom mechanism.
In addition, the light projecting / receiving unit 2 is provided with a pyroelectric infrared sensor that detects infrared rays emitted by the human body. The pyroelectric dam sensor detects a person coming to the screen 10 side, outputs an interlock signal to the laser projection means 5, and prohibits laser light projection.

FIG. 3 is a schematic view of the laser projection means 5. In FIG. 3, reference numeral 50 is a laser generating mechanism,
The laser generating mechanism 50 is horizontally rotated by the X-axis motor 51 and the reduction gear 52, and further vertically rotated by the Y-axis motor 53 and the reduction gear 54. As a result, the laser generation mechanism 50 can be oriented in any direction.

The light projecting / receiving section 2 has a computing section. This computing unit obtains the coordinates of the designated point P in the field of view when the designated point P of the infrared light projected by the pointer 3 is photographed by the photographing means. Then, the calculation unit calculates the tilt angle of the laser generation mechanism 50 based on the obtained coordinates of the designated point P and the distance to the screen 10 measured by the autofocus mechanism, and the X, Y axis motors 51, The rotation angle is output to each motor driver 53 (not shown).

2. Operation of Embodiment A. Initialization Next, the operation of the presentation system having the above configuration will be described. FIG. 2A shows the screen 10 seen in the field of view V of the finder 20 of the light projecting / receiving unit 2. The screen 10 looks trapezoidal because it is seen from slightly below the front. First, the position of the light emitting / receiving unit 2 is adjusted while looking at the finder 20 of the light emitting / receiving unit 2, and the screen 10 is arranged in the center of the field of view of the finder 20.
Then, the size of the screen 10 in the visual field V is enlarged by the zoom mechanism so that the screen 10 becomes the maximum in the visual field V as shown in FIG.

Next, from the pointer 3 to the screen means 1
Infrared light is projected on the four corners of 0, and the contour of the screen means 10 is stored in the calculation unit. In this case, since the four reference points O on which the invisible light is projected almost coincide with the edges of the visual field V, the calculation section can quickly and accurately determine the position information of the reference point O in the visual field V. You can

B. Presentation In the presentation, the liquid crystal projector 1 projects the personal computer image displayed on the CRT of the personal computer 4 on the screen 10. When the infrared light is projected from the pointer 3 onto the screen 10, the infrared light designated point P is shown in the image taken by the photographing means of the light projecting / receiving unit 2. Calculate the relative position as coordinates. Then, the calculation unit calculates the distance information to the screen means obtained from the autofocus mechanism and the designated point P in the visual field V.
Of the laser beam projected from the laser projecting means 5 and the angle information is obtained.
Output to 0 motor driver. The motor driver rotates the motors 51 and 53 based on the input angle information, whereby the laser generation mechanism 50 is directed to the designated point P, and the laser light is projected there.

As described above, in the above presentation system, the position on the screen 10 of the invisible light photographed by the photographing means of the light projecting / receiving part 2 is obtained by the calculating part, and the laser projecting means 5 causes the laser to project to that position. Since the light is projected, it is possible to project a point at an arbitrary position on the projected image. Further, although the laser light is used, it is not emitted from the pointer 3, so that the laser light is safe from being projected to the audience by the careless operation of the pointer 3. Furthermore, since the pointer is projected at the position obtained by the calculation unit, the camera shake can be prevented by controlling the pointer so that it does not move unless the position moves by a predetermined amount or more. Moreover, by distributing the position information of the pointer to the plurality of laser projecting means, it is possible to project the laser light on the plurality of screen means, and it is possible to deal with a multi-screen.

In particular, in the above-described embodiment, the light projecting / receiving unit 2 including the photographing unit and the laser projecting unit 5 is provided separately from the liquid crystal projector 1, and the light projecting / receiving unit 2 is arranged closer to the screen 10 than the liquid crystal projector 1. Therefore, the risk of a person passing between the laser projection means 5 and the screen 10 is reduced, and the safety is further improved. Further, since the laser projection means 5 is provided with an infrared detection means for detecting infrared rays emitted by the human body, when a person comes in the direction of the projection of the laser light, an interlock works and the projection of the laser light is prohibited. Further, the safety is improved. In addition, in the above-described embodiment, since the light emitting / receiving unit 2 is provided with the finder, the auto focus mechanism, and the zoom mechanism, there is an advantage that the initial setting is easy.

Next, FIGS. 4 and 5 are views showing a modification of the laser projection means 5. The laser projection means 6 shown in FIG. 4 is an application of the galvano-scanner system, in which a reflecting mirror 61 is arranged on the tip side of the laser generating mechanism 60 and a reflecting mirror 62 is arranged on the side of the reflecting mirror 61. ,
The reflecting mirror 61 is rotated horizontally by the X-axis motor 63,
The reflecting mirror 62 is rotated vertically by a Y-axis motor 64. With this configuration, the laser light emitted from the laser generation mechanism 60 can be directed to any direction on the screen 10.

The laser projection means 7 shown in FIG. 5 has an optical fiber 71 connected to the laser emission part of the laser generation mechanism 70.
The tip portion of the optical fiber 71 is rotated in the horizontal direction by the X-axis motor 72, and is also rotated in the vertical direction by the Y-axis motor 73. With this configuration, the laser generation mechanism 70 can be oriented in any direction on the screen 10.

[0025]

As described above, according to the present invention,
Since the laser beam is projected by the laser projecting unit to the position of the invisible light projected on the screen unit by the supporting unit, it is possible to safely use the laser beam with good visibility, and to suppress the hand shake. In addition to being able to do so, it is also possible to support multiple screens and enhance the presentation.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a presentation system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a field of view of a finder according to an embodiment of the present invention.

FIG. 3 is a perspective view showing an outline of laser projection means in the embodiment of the present invention.

FIG. 4 is a perspective view showing a modified example of the laser projection means in the embodiment of the present invention.

FIG. 5 is a perspective view showing another modified example of the laser projection means in the embodiment of the present invention.

[Explanation of symbols]

1 Liquid crystal projector (projection means) 2 Emitter / receiver (photographing means) 3 pointers (pointing means) 5 Laser projection means 10 screens (screen means) 50, 60, 70 Laser generation mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H021 AA00                 2H088 EA12 HA28 MA01                 5B087 AA09 AB04 CC09 CC21 CC26                       CC33 DE07 DG02

Claims (4)

[Claims] 1. A screen means, an instruction means for projecting invisible light on the screen means, a photographing means for photographing the invisible light projected on the screen means, and a means for photographing the invisible light photographed by the photographing means. A presentation system comprising: a calculation unit for calculating a position on the screen unit; and a laser projection unit for projecting a laser beam to the position calculated by the calculation unit. 2. An image projecting means for projecting an image onto the screen means is provided, and a light projecting / receiving section provided with the photographing section and the laser projecting section is provided separately from the image projecting section, and the light projecting / receiving section is provided with the image. The presentation system according to claim 1, wherein the presentation system is arranged closer to the screen means than the projection means. 3. The laser projection means is provided with infrared detection means for detecting infrared rays emitted by a human body, and an interlock mechanism is provided for prohibiting projection of the laser light when the infrared rays are detected on the laser light projection direction side. The presentation system according to claim 2, wherein the presentation system is provided. 4. The presentation system according to claim 2, wherein the photographing means is provided with a finder, an autofocus mechanism and a zoom mechanism.