JPS593477A - Graphic display by deflection of laser beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a graphic display device using deflection of laser light, and more specifically, the present invention relates to a graphic display device that uses deflection of laser light. A horizontal system that modulates laser light based on information such as a figure, and vibrates the modulated laser light in a sine wave.
This invention relates to a vertical deflection mirror device.

Traditionally, electronic circuit diagrams and designs for various products were drawn on cathode ray tube displays (CRTs) using a light ben using an electronic computer, and the necessary additions and corrections were made using the light ben to design the electronic circuits and create the goods. Design etc. are being done. However, since the tube surface of a CRT that displays images is formed of a thick glass plate, and the glass plate is curved, parallax inevitably occurs in the image, making it difficult to draw the desired shape using the light beam or make any necessary additions. , the disadvantage is that it is extremely difficult to modify and difficult to use.

On the other hand, as an input device for displaying on CR and T, a device that allows drawing with a stylus on a tablet can also be used. However, in this case, the figure drawn on the tablet cannot be displayed on the tablet as it is, and is placed in a different position than the one drawn. It is practically impossible to make additions or corrections from the original.

Therefore, a translucent digitizer is used in place of the above-mentioned tablet, etc., and as a figure, etc. is drawn on the translucent digitizer with a stylus, the translucent digitizer is used as a screen, and a laser beam controlled according to the drawing is horizontally drawn. It is conceivable to perform vertical scanning and project and display images such as the above-mentioned figures.

In this case, the horizontal and vertical deflection required for laser beam scanning can be achieved by reflecting the laser beam with a horizontal and vertical deflection mirror that vibrates in a sine wave. This is accompanied by technical difficulties, and it is difficult to provide accurate sine wave vibration with a simple configuration.

In order to solve these problems, the present invention makes use of the elasticity of a metal rod whose end is fixed, and applies fast-cycle torsional vibration to it due to the torque generated by an alternating magnetic field, thereby reducing the deflection on the metal rod. The laser beam is deflected by minute vibrations of a plane mirror, and since the deflection is minute, the deflection angle is expanded by a curved columnar deflection curved mirror. This allows deflection by changing the deflection angle. Such a deflection is particularly effective when applied to a horizontal deflector in which the mirror must be vibrated at a fast period.

In order to achieve the above object, the present invention includes a polarization modulator that modulates a laser beam projected from a laser tube with a modulation signal corresponding to the coordinates of a figure drawn with a stylus on a translucent digitizer. , is equipped with an AC electromagnet that torsionally vibrates near the laser light point outputted from this polarization modulator with a fast period, and is constructed by providing a plane mirror on the metal rod, and the laser light outputted from this horizontal deflector. A horizontal deflection curved mirror is formed in the shape of a curved column, and the vertical deflection angle of the laser beam whose horizontal deflection angle is enlarged is further enlarged in this curved mirror, so that the horizontal deflection angle of the laser beam is , is characterized by being provided with a vertical deflector that enables display of images by vertical scanning.

According to the graphic display device of the present invention, by twisting a metal bar equipped with a mirror that deflects a laser beam using torque generated by a variable current magnetic field, the mirror is vibrated sinusoidally by a minute angle, and the mirror deflects the laser beam by a minute angle. The deflection angle of the laser beam is magnified by the next-stage deflection curved mirror, making it easy to obtain a laser beam with a deflection angle large enough to scan the screen. An image corresponding to the modulation signal can be drawn.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The graphic display device shown in FIG. 1 is used for interacting with an electronic computer, and forms a screen by reflecting laser light on a vibrating mirror. The back side of the translucent digitizer 1 is scanned horizontally and vertically, and images such as figures drawn on the front side of the digitizer 1 with the stylus 2 are displayed in real time at the marked position. It consists of a physical control circuit section and a laser beam processing section.

The electrical control circuit unit includes a coordinate detection/input circuit that detects coordinate signals of a position on the translucent digitizer 1 pressed with the stylus 2 and inputs the detected coordinate signals to a computer, and has software for processing the coordinate signals. A video signal generation circuit is connected to an electronic computer, and this video signal generation circuit is connected to a deflection control circuit that controls the deflection in order to synchronize the video signal with the horizontal and vertical deflection of the laser beam. In order to modulate light, a polarization modulator is connected to the video signal generation circuit via a laser light modulation circuit.

On the other hand, in the laser beam processing section, the laser beam L1 projected from the laser tube 3 is sent to the polarization modulator 5 through the lens system 4. This polarization modulator 5q modulates the laser light based on the video signal, thereby giving the laser light gradation information corresponding to the displayed figure on the semi-transparent digitizer 1, and as described later, it modulates the laser light based on the video signal. It outputs the necessary intermittent signals to make the scanning lines of the laser beam that horizontally scans the screen parallel to each other, and as shown in Figure 2, the laser beam from the laser tube 3 is divided into two types of polarization. The modulator is equipped with a beam splitter 7 that separates polarized light into t1 and z2, and by arranging modulators 8 and 9 with good rise characteristics connected to the laser light modulation circuit in the optical path of each polarized light t, , and t2. The polarized waves t, , t2 inputted to 8 and 9 are modulated based on the video signal, and the modulated polarized wave t3 after modulation.

The signal t4 is outputted as an intermittent signal7.

That is, the plane mirror I6 in the horizontal deflector 13 described later
One modulator 8 is based on the period of the sinusoidal vibration of α.
From, (21L+-)π~(zrL0-)π (n: integer) 0
・A modulated polarized wave that is extinguished outside the range of (S2) is output, and from the other modulator 9,
(2) A modulated polarized wave that is extinguished outside the range of 2 is output. Furthermore, after the modulators 8 and 9, the pair of modulated polarized waves t3
, t4 into a composite laser beam L2. The 13% horizontal signal adjuster 14 and the horizontal deflection curved mirror 15 horizontally deflect the combined laser beam L2. First, a horizontal deflector 13 horizontally deflects the combined laser beam by a minute angle.
As shown in FIGS. 6 to 5, it is equipped with a substantially cylindrical metal rod 16 with high magnetic permeability fixed at both ends, and a part of its outer peripheral surface is planarized and polished, or metal rod 16 is coated with gold by vapor deposition. By doing so, a plane <5-16α is formed, and the metal rod 16 is loosely inserted into the ring-shaped AC electromagnet 17 in a fixed state, and the electromagnet 17
Two pairs of magnetic poles 18 (L, 18.
6 and 19a.

The coil of 19b is connected to the lead wire 20, and the metal rod 16 is twisted in opposite directions alternately using its own elasticity, so that the metal rod 16 is within the shear strength at a fast cycle near its resonance point. When the metal rod 16 is slightly torsionally elastically vibrated, the plane mirror 16α on the metal rod 16 vibrates in a sinusoidal frequency at a minute displacement angle, and the synthesized laser beam L2 is reflected by the plane mirror 16α. The combined laser beam L2 can be horizontally deflected by a small angle. Note that the metal rod 16 may have only one end fixed. Therefore, the deflection angle displacement of the composite laser beam L3 horizontally deflected in this way is equal to (it
, (In the range of Equation 23, the displacement is reversed with a phase shift of π.

The horizontal signal adjuster 14 at the next stage into which the synthesized laser beam L3 is input matches the optical path length and deflection angle displacement of the pair of polarized waves ts and t6 constituting one synthesized laser beam L3, as shown in FIG. As shown, it is composed of a pair of beam splitters 23 and 24 that separate and combine the combined laser beam L3, and an inverting prism section and a plurality of mirrors 26 that are arranged between them to reverse the left and right images. The optical path of one polarized wave t6 transmitted through the beam splitter 23 is connected to the mirror 2.
6 to match the optical path lengths of the pair of polarized waves, and invert the other polarized wave t5 with an inverting prism to match the polarization displacement angles of the pair of polarized waves, and further convert those polarized waves into a beam. The laser beams are synthesized by a splitter to obtain a synthesized laser beam L4 having a deflection angle displacement with a period of π.

The horizontal deflection angle of the next-stage horizontal deflection curved surface to which the combined laser beam L4 is inputted is expanded, and each horizontal scanning line scans at a uniform speed. It is provided with a curved mirror surface 15α formed in relation to the horizontal deflection speed of the input combined laser beam L4. Note that the mirror surface 15
Since it is unavoidable that the beam of the combined laser beam L5 itself expands due to reflection at a, it is necessary to give a negative angle of expansion to the beam itself using a lens in advance. Furthermore, if a single horizontally deflecting curved mirror 15 cannot obtain a deflection angle large enough to scan the screen of the translucent digitizer 1 from side to side, the horizontally deflecting curved mirror 15 can be provided in multiple stages. .

The vertical deflector 27 and the four vertical deflection curved mirrors into which the synthesized laser beam L5 obtained in this manner is input, continue to vertically deflect the horizontally deflected synthesized laser beam L5. First, the vertical deflector 27 Lds shown in FIGS. 7 to 9 for vertically deflecting by a small angle is formed, and
The metal rod 3I is loosely inserted into a pair of fixed ring-shaped AC electromagnets 32, 32, and the pair of electromagnets 32, 32 are radially opposed to each other.
・°°6・and "°"・34 A (7) : I - (The metal rod 31 is alternately twisted in opposite directions with torques T1' and T2' to cause the mirror 31 el to vibrate slightly torsionally, thereby The combined laser beam L6 is reflected by a mirror 31α vibrating in a sinusoidal manner, and is configured to be vertically deflected.

In this case, since both sides of the mirror 31a in the metal rod 31 are twisted by a pair of electromagnets 32, deformation of the mirror 31 (L) is prevented, and since a low frequency current is caused to flow through the coil, Since the torsional spring constant of the metal rod 31 is large, the metal rod 31 vibrates in accordance with the applied torque.

Note that the metal rod 31, like the metal rod 16 described above and the one-end mirror 15, expands the deflection angle of the composite laser beam L6 deflected by the vertical deflector 27, and equalizes the scanning speed in vertical scanning. Curved ξ curved surface 2812 for velocity
The combined laser beam L7 reflected by the mirror surface 281Z repeatedly scans the screen horizontally and vertically from the back surface of the translucent digitizer I.

Next, the operation of the above device will be explained.

First, when a figure, etc. is drawn on the translucent digitizer 1 with the stylus 2, the coordinate signals of each point constituting the figure, etc. are sequentially detected by the coordinate detection/input circuit and input into the electronic calculator, and these signals are is processed by a computer and input to a video signal generation circuit, and in the video signal generation circuit, the gray level signal from the computer becomes a video signal synchronized with the horizontal and vertical deflection according to the control signal from the deflection control circuit. A signal is sent to a laser light modulation circuit.

In parallel with this, the polarization modulator 5 is individually modulated based on the shira modulation signal to give shading information such as a figure, and the horizontal deflector 13 has a plane mirror 16 (sine wave vibration of L). With the period of becomes.

The synthesized laser beam L2 is reflected by a plane mirror 16α that vibrates in a sine wave in the horizontal deflector 13 of the next stage, and is horizontally deflected at high speed, and the above (1) in the sine wave is reflected.
% (2) The laser beam L3 is extinguished outside each range of formula (2).

The laser beam L3 obtained in this way is separated again into two types of polarized waves t5 and 16 by a beam splitter 23 in the next stage horizontal signal conditioner 14 shown in FIG. 6, and each of them passes through a different optical path. The combined laser beam L4 has optical path lengths that match each other, and one of the polarized waves is horizontally polarized 15 times.
4, the deflection angle is expanded by a horizontal deflection curved mirror 15.

Furthermore, the horizontally deflected laser beam LsFi, the seventh
It is vertically deflected by a vertical deflector 27 shown in FIGS. 9 to 9, and then the vertical deflection angle is expanded by a vertical deflection curved mirror 4 to horizontally and vertically scan the back surface of the translucent digitizer 1,
Draw an image of the above figure, etc.

In this way, an image such as a figure is drawn on the back side of the semi-transparent digitizer 1, so while observing the image from the front side of the semi-transparent digitizer 1, it is said that ``Drawing a sword is the input of figure information to a computer. The translucent digitizer can also be used as a device for outputting graphical information stored and processed in an electronic computer.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an overall configuration diagram of the graphic display device of the present invention, FIG. 2 is a configuration diagram of its polarization modulator, and FIGS. 6 to 5 are plan views of its horizontal deflector. , a front view and a sectional view taken along the line A-A in FIG. 3, FIG. 6 is a configuration diagram of the horizontal signal conditioner, and FIGS. It is a sectional view taken along the line BB in the figure. 1...Semi-transparent digitizer, 2...Stylus,
3... Laser tube, 5... Polarization modulator, 13...
...Horizontal deflector, 15...Horizontal deflection curved mirror, 16
・φ・Metal rod, I6a, 31α・・ψ plane mirror,
17... AC electromagnet, 27... Vertical deflector. Designated Agent: Director of Product Science Research Institute, Agency of Industrial Science and Technology, Keiji Takahashi

Claims (1)

[Claims] 1. Equipped with a polarization modulator that modulates the laser light projected from the laser tube with a modulation signal corresponding to the coordinates of a figure drawn with a stylus on the translucent digitizer, and A horizontal deflector that is equipped with an AC electromagnet that vibrates torsionally at a fast period near the resonance point of the body, and is constructed by providing a plane mirror on the metal rod, and expands the deflection angle of the laser beam output from this horizontal deflector. The curved mirror is formed into a curved columnar shape, and the vertical deflection angle of the laser beam whose horizontal deflection angle has been enlarged is further enlarged by this curved mirror, and the ms obtained by horizontal and vertical scanning of the laser beam is displayed on the back surface of the translucent digitizer. A graphic display device using deflection of laser light, characterized in that it is provided with a vertical deflector that allows the deflection of laser light.