JP2005135081A - Light pen and electronic blackboard using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a user-friendly light pen such as a usual whiteboard marker and an electronic blackboard using this. <P>SOLUTION: The light pen used for a screen to obtain coordinates of a pointer by capturing an image through an imaging device has a light emitting element 1 disposed at a tip of the pointer; a pressure detection part 3 detecting that the tip of the pointer is pressed to the screen; and a light emitting control part 4 controlling the element 1. The light pen varies a light emitting state of the element 1 on the basis of the detection result of the detection part 3. Thereby a luminescent spot is present on the screen, so that a projector can always detect the coordinates (position) of the element 1 on the screen. The projector can detect operations of the light pen by a light receiving element. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light pen and an electronic blackboard using the same.

  Conventionally, in an electronic blackboard, a button switch provided on an LED light-emitting pen (hereinafter referred to as a light pen) is turned ON / OFF, for example, a user presses a button to cause the LED to emit light only while the switch is ON. An image pickup device captures a bright spot, and draws a line from the coordinates of the bright spot to a corresponding position on the screen. There is no electronic blackboard that acquires the coordinates of a pointer by capturing an image with the image sensor.

  Next, another conventional example will be described. Referring to FIG. 3, the light pen is provided with a spring receiving seat 22 in the cap 21, and the light emitter holding member 23 is interposed between the spring receiving seat 22 and the light emitter holding member 23. A spring 24 for urging the projection in the protruding direction is mounted.

  Here, when the tip of the light pen is held and pressed against the drawing display device with a predetermined force, the light emitter holding member 23 moves to the main body 25 side. It is detected that a point-like force is applied to the display device, and the light emitter 27 is turned on.

  Next, when the pressing force at the tip is released, the light emitter holding member 23 is returned by the urging force of the spring 24, so that the action of the pressure detecting member 26 is released and the light emitter 27 is turned off. As a result, there is no variation in the output of the pressure-sensitive rubber constituting the press detection member 5, and malfunction can be prevented (see, for example, Japanese Patent Laid-Open No. 63-155318).

JP-A-63-155318

  However, in the other conventional example described above, the imaging element captures the luminescent spot that emits light, and draws a line from the coordinates of the luminescent spot to the corresponding position on the screen, so that the coordinates of the pointer are obtained. Not something.

  The object of the present invention is to realize an easy-to-use light pen like a normal whiteboard marker, and also to perform typical operations of a personal computer such as click, double click and drag on an electronic blackboard comprising a light pen and an image sensor. Be able to reproduce naturally.

  The light pen of the present invention is a light pen used for a screen that acquires the coordinates of a pointer by capturing an image with an image sensor, and light emitting means provided at the tip of the pointer and the tip of the pointer are pressed against the screen. And a light emission control means for controlling the light emission means.

  The light emission control means changes the light emission state of the light emission means based on the detection result of the press detection means, and the light beam of the light emission means is infrared light.

  Further, in the present invention, in an electronic blackboard provided with a projector that projects characters and figures on the screen, the light pen of the present invention is used, and the light receiving element that receives light emitted from the light pen and the light pen on the screen And an image data generating unit configured to generate image data for the projector based on a light reception signal from the light receiving element and an image pickup signal from the image pickup element.

  The image data generating unit includes a function selecting unit that selects a function when the light pen is pressed on the screen at a predetermined timing.

  A light pen of the present invention and an electronic blackboard using the light pen are coordinate designation pointers used for a screen for acquiring the coordinates of a pointer by capturing an image by an image pickup device, the light emitting means provided at the tip of the pointer, and the pointer A pressure detecting means for detecting that the tip of the light is pressed against the screen, and a light emission driving means for driving the light emitting means.

  Since the light pen of the present invention is always in a light emitting state and there is always a bright spot on the image sensor, the projector can always know the coordinates (position) of the light emitting element on the screen. The operation of the light pen can be known by the light receiving element.

  Furthermore, by providing a function selection means for selecting a necessary function by pressing the screen at a predetermined timing of the light pen, an easy-to-use light pen such as a whiteboard marker is realized, and the electronic blackboard can be clicked and A typical operation such as a double click can be performed.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram for explaining an embodiment to which the present invention is applied. First, referring to FIG. 1, the light pen of the present invention is provided with a light emitting portion 1 that is provided at a tip portion and emits light (infrared light), and when the light emitting portion 1 is pressed from the outside, the pressing force is applied. The pressure detection element 2 to detect, the pressure detection part 3 which calculates | requires pressing force from the detection signal from the pressure detection element 2, and the light emission control part 4 for modulating the light beam of the light emission part 1 are comprised.

  Next, referring to FIG. 2, in the present invention, in the electronic blackboard provided with the projector 14 that projects characters and figures on the screen 11, the light receiving element that receives light emitted from the light pen using the light pen of the present invention. 13, an image sensor 12 that captures a bright spot on the screen with a light pen, and an image data generator that generates image data for the projector 14 based on a light reception signal from the light receiver 13 and an image signal from the image sensor 12. (Not shown).

  Next, the operation of the light pen of the present invention configured as described above will be described. Referring to FIG. 2, the present embodiment is an example of application to an electronic blackboard by the projector 14. In this embodiment, a light pen is used on the screen 11. However, in the light pen of the present invention, the light emitting unit 1 always emits light when in use, and the light emitting unit 1 is pressed from the outside and the pressure detecting element 2 is pressed. When the pressure detection unit 3 detects the signal from the light emission control unit 4, the light emission control unit 4 controls to perform modulation determined for light emission of the light emitting element 1 based on the detection result.

  In addition, since there are always bright spots on the image sensor 13, the projector 14 can always know the coordinates (position) on the screen 11 of the light emitting element 1. The operation of the light pen can be known by the light receiving element 13.

That is, the light receiving element 13 and the light emitting element 1 are similar to the relationship of a general infrared remote controller, and for example,
(1) When the light pen is separated (floating) from the screen (2) When the light pen is pressed against the screen, the state of the light pen at that time is sent to the light receiving element 13 as a light pulse code. Furthermore, in the present invention, as another embodiment, in addition to the above operation, for example,
(3) When the screen is knocked once with a light pen (4) Click, which is a typical operation of a personal computer, by detecting and recognizing actions such as when the screen is knocked twice with the light pen It is also possible to have functions such as double-clicking, etc., and further expand the application range of operation.

  The light pulse used in the so-called infrared remote controller such as the light pen of the present invention is generally modulated at about 38 kHz, so that it can be regarded as a normal bright spot by the image sensor 12, so that the coordinates are acquired. There will be no problems.

  The present invention realizes an easy-to-use light pen such as a normal whiteboard marker, and can perform typical operations such as clicking on a personal computer and double clicking on an electronic blackboard.

It is a figure which shows one embodiment of this invention. It is a figure explaining the state to which this invention is applied. It is a figure which shows an example of the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Pressure detection element 3 Pressure detection part 4 Light emission control part 11 Screen 12 Image pick-up element 13 Light receiving element 14 Projector 21 Cap 22 Receptacle 23 Light emitter holding member 24 Spring 25 Main body 26 Press detection member 27 Light emitter

Claims (6)

A light pen used for a screen for acquiring the coordinates of a pointer by capturing an image by an image pickup device, a light emitting means provided at the tip of the pointer, and a press detection means for detecting that the tip of the pointer is pressed against the screen And a light emission control means for controlling the light emission means. The light pen according to claim 1, wherein the light emission control means changes a light emission state of the light emission means based on a detection result of the press detection means. The light pen according to claim 1, wherein the light beam of the light emitting means is infrared light. An electronic blackboard provided with a projector for projecting characters and figures on a screen, wherein the light pen according to claim 3 is used, a light receiving element for receiving light emitted from the light pen, and a bright spot on the screen by the light pen. An electronic blackboard comprising: an imaging device for photographing; and image data generating means for generating image data for the projector based on a light reception signal from the light receiving device and an image pickup signal from the imaging device. The electronic blackboard according to claim 4, wherein it is detected whether or not the tip of the light pen is pressed against the screen. 6. The electronic blackboard according to claim 4, further comprising a function selection unit that selects a function in the image data generation unit by pressing the light pen on the screen at a predetermined timing.

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