JPS6134164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parallel light beam projection type graphic input/output device.

Traditionally, graphic input/output devices have been used to display figures drawn on a tablet with a stylus on a CRT, or to display figures drawn on a CRT with a light pen.
There are some that are designed to be displayed on a CRT, but
When observing figures displayed on a CRT, it is unavoidable that parallax will occur due to the front glass of the tube.Furthermore, in large screen CRTs, the figure will be distorted due to the curvature of the tube surface. Since there is a tablet as an output screen and a CRT as an output surface, it is extremely difficult to add and modify figures on the CRT using operations on the tablet. The problem is that it is difficult to draw.

An object of the present invention is to create a figure that allows a figure to be easily drawn, displays the drawn figure in real time with high precision and without distortion at the drawn position, and further allows the figure to be observed without parallax. Its purpose is to provide input/output devices.

In order to achieve the above object, the graphic input/output device of the present invention includes a graphic input/output board composed of a flat semi-transparent digitizer on which a graphic is drawn with a stylus and which functions as a screen, and an electrical signal generated by the graphic input/output board. An atomic computer that converts the coordinate values of each point in the above-mentioned figure, detected as an image memory, a scanning light generator that simultaneously generates a plurality of parallel light beams whose intensity is modulated based on raster data from the image memory, and converts the plurality of light beams into signals from an electronic computer and the synchronization signal. The present invention is characterized by comprising a rotating polyhedral mirror for horizontal scanning and a galvanometer mirror for vertical scanning, which scan horizontally and vertically based on the image data and project the graphic onto the back surface of the graphic input/output board.

In such a light beam parallel projection type graphic input/output device of the present invention, when a figure is drawn on the surface of the figure input/output board with a stylus, the figure is accurately displayed in real time from the back surface of the figure input/output board using the figure input/output board as a screen. Therefore, it is easy to make additions and corrections while accurately viewing the figure as scattered light from the surface without parallax.Also, since the figure input/output board is composed of a flat translucent digitizer, it can be easily accessed using a stylus. Not only can figures be drawn easily, but the projected and displayed figures are not distorted.Furthermore, since the projected figures are displayed using multiple parallel light beams, high-quality images can be obtained with simple scanning. That is, it is possible to obtain a high-quality raster scan display at high speed and high precision suitable for graphic display, for example, a high-quality image displayed at about 1024×1024 points at 1/30 second.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 1, 1 is a figure input/output board composed of a translucent digitizer, and 2 is a stylus for drawing figures on the surface of the figure input/output board. The display position of is detected as an electrical signal. That is, the graphic input/output board 1 and the stylus 2 are connected to the coordinate reader 3.
connected to an electronic computer and image memory via
As a result, the stylus 2 can be used to
If you draw a figure on the top, the coordinate values of the stylus 2 on the figure input/output board 1 in the process will be detected by the coordinate reader 3.
are sequentially detected as digital quantities by
Those coordinate values are sent to a computer. The computer performs processing such as recognition of figures and calculations between figures based on the input coordinate values, manages a figure database for reproducing and displaying the figures, and converts the figure database into digital image data into pixels. After converting to , raster data is organized into raster units, and the raster data is sent to an image memory to be stored. The image memory is configured to be able to simultaneously output raster data for a plurality of lines based on a request from the scanning light generating section 4, which will be described later.

Scanning light generator 4 connected to the image memory
is for generating a large number of parallel light beams for scanning and displaying images on the graphic input/output board 1 based on the raster data stored in the image memory, and for performing intensity modulation, etc. on them. It is equipped with a video signal decoder 5, optical beam generators 6, 6..., beam diameter adjusters 7, 7..., and a beam interval adjuster 8.

The video signal decoder 5 simultaneously reads out multiple lines of raster data stored in the image memory,
It sends it out as an optical modulation signal to the optical beam generator group 6, 6, . Based on the control signal, multiple predetermined pieces of raster data are
These raster data are read out in accordance with the order of the pixels included in them and in synchronization with the synchronization signal from the generator 20, and these raster data are converted into analog video signals, and the light beam generators 6,
6, . . . as optical modulation signals. Blanking during the scanning line retrace period is also performed in synchronization with the synchronization signal.

The light beam generators 6, 6, ... are for generating a plurality of parallel light beam groups, and each light beam is intermittent in synchronization with the synchronization signal and in correspondence with the analog video signal. These light beams are sent to beam diameter adjusters 7, 7, ... and converged to a predetermined beam diameter, and then sent to a beam spacing adjuster 8 to adjust the raster spacing to a predetermined value. The interval between the respective light beams is narrowed while remaining parallel so that the beam spot diameter and raster accuracy are achieved on the graphic input/output board 1. Note that the light beam generator and beam interval adjuster are configured by a lens system.

A scanning unit 11 that scans the graphic input/output board 1 with a plurality of parallel light beams controlled in this manner.
is a horizontal scanning rotating polygon mirror 12 for horizontally scanning the graphic input/output board 1 by horizontally scanning the light beams, and a horizontal scanning rotating polygon mirror 12 for vertically scanning the input/output board 1 by vertically swinging each light beam. A vertical scanning galvanometer mirror 13 is also provided. The rotating polyhedral mirror 12 and the galvanometer mirror 13 control the timing of horizontal scanning and vertical scanning by an optical scanning controller 18 based on the synchronizing signal generated by the rotating synchronizing signal generator 20 and display frame information from the computer. A drive control signal is generated to achieve this, and the drive is controlled by this signal.

That is, the rotating polygon mirror 12 is configured to be rotatable by a rotating polygon mirror driver 15 consisting of a high-precision motor attached to it via a drive shaft 14, and the galvano mirror 13 is configured to have a drive shaft 16 connected thereto. The galvanometer mirror driver 17, which is a high-precision servo-type rotary vibrator, is installed through a galvano mirror driver 17, and each of the drivers 15 and 17 is controlled by a drive control signal from an optical scanning controller 18. The drive control signal is generated based on the synchronization signal applied to the controller 18 and display frame information from the computer. The synchronization signal is generated by projecting a laser beam from a rotation detection light source 19 consisting of a laser light source onto the rotation polygon mirror 12 and receiving the reflected light by the rotation synchronization signal generator 20. The edge is detected and obtained as a rectangular waveform synchronized with the rotation of the mirror 12. The number of frames per second can be controlled by detecting the number of rotations of the rotating polygon mirror 12, generating a signal with a sawtooth waveform in the optical scanning controller 18 at each pre-calculated number of rotations, and transmitting the signal. This is done by adding to the galvanometer mirror driver 17 and vibrating the galvanometer mirror 13 thereby. The number of frames per second is adjusted to an arbitrary value by a signal from the computer.

In the graphic input/output device having such a configuration, digital image data read from the image memory based on the synchronization signal from the rotation synchronization signal generator 20 is converted into an analog video signal in the video signal decoder 5, Thereby, the light beam generator groups 6, 6, . . . are controlled to generate a light beam having the required light intensity. This light beam is
After achieving the required raster accuracy and beam spot diameter, it is subjected to horizontal deflection by the rotating polygon mirror 12 for horizontal scanning and vertical deflection by the galvanometer mirror 13 for vertical scanning, and the entire surface of the graphic input/output board 1 is rasterized. By scanning, the graphics stored in the image memory are projected and displayed on the back surface of a graphics input/output board 1 consisting of a semi-transparent digitizer.

Any figure can be drawn on the figure input/output board 1 using the stylus 2. In this case, the movement of the stylus 2 is determined by detecting the signal output from the stylus 2 with the coordinate reader 3 and inputting the figure. The coordinate values specific to the output plate 1 are converted and sent to an electronic computer.

In the electronic computer, the surface figure database is converted into pixels, organized into raster units, and transmitted as image data to the image memory, and a predetermined number of pixels are transmitted in response to a request from the scanning light generator 4. The corresponding raster is transmitted to the scanning light generator 4 in accordance with the pixel order, and as a result, the figure is displayed on the figure input/output board 1.

In this way, the trajectory of the movement of the stylus 2 can be immediately analyzed and displayed on the graphic input/output board 1, and the graphics to be displayed can be accurately input by superimposing the trajectory on the trajectory while checking the movement of the stylus 2. can do.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention. 1...Graphic input/output board, 2...Stylus, 4...
...Scanning light generating section, 12, 13...Mirror.

Claims (1)

[Claims] 1. A graphic input/output board composed of a flat semi-transparent digitizer on which a graphic is drawn with a stylus and which functions as a screen, and each point in the graphic detected as an electrical signal by the graphic input/output board. an electronic computer that converts the coordinate values of the image into multiple pieces of raster data for each raster, an image memory that stores multiple pieces of raster data and makes it possible to read them in synchronization with a synchronization signal, and raster data from the image memory. a scanning light generator that simultaneously generates a plurality of parallel light beams whose intensity is modulated based on data; and a scanning light generator that scans the plurality of light beams horizontally and vertically based on a signal from an electronic computer and the synchronization signal; A light beam parallel projection type graphic input/output device comprising: a rotating polygonal mirror for horizontal scanning and a galvanometer mirror for vertical scanning, which project the graphic on the back surface of the graphic input/output board.