JPS62296224A - Coordinate input device - Google Patents

Abstract

PURPOSE:To eliminate a parallax between a position on a displaying means and a position instructed by an oscillation generating means by forming an oscillation propagating means and a displaying means in a single body. CONSTITUTION:The device is composed of a vibrator pen 4-1, sensors 4-2a and 4-2b, a flat display 4-3 such as a liquid crystal display and a reflecting preventing material 4-4 to prevent an edge surface reflection. The display may be not only a liquid crystal but the plane display such as an electroluminescence, electrochromic and plasma display. Thus, by directly fitting a sensor to the display, the influence of the parallax can be decreased and the effect of a low cost operation by simplifying a structure can be obtained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a coordinate input device, and particularly to a digitizer that is integrated with a display section and uses elastic waves.

(Prior Art) Conventionally, one example of this type of apparatus is constructed as shown in FIG. In the figure, 1-1 is a vibrator that generates elastic waves, and 1-3 is a glass plate that transmits elastic waves (
or metal plate), 1-2a, 1-2b, t-2c are sensors that detect elastic waves, 1-4 is a circuit that detects the output from the sensor, 1-5 is the vibrator of the vibrator Ben 1-1 1
The driving circuit 1-6 is an arithmetic and control section that controls each section and performs arithmetic operations, and has a timer 1-7 inside.

In this configuration, first, a start signal is output from the calculation and control section 1-6, and a one-shot pulse as shown in FIG. 2-1 is output from the drive circuit 1-5. At this time, counter 1-7 starts counting and starts measuring time. The one-shot pulse 2-1 sent to the vibrator Ben 1-1 causes the piezoelectric vibrator in the vibrator Ben 1-1 to become electrically
Performing mechanical conversion, a bullet FI wave is generated within the glass plate 1-3. This elastic wave is generated by the vibrator Ben 1-1 and the sensor 1-2.
a, 1-2b, ]-2c, each sensor 1-2a is delayed by an amount corresponding to its respective distance from the sensor 1-2a.

1-2b and 1-2c are detected. This waveform is shown in Figure 2.
-2 waveform, and the threshold value vt in this waveform is
The detection circuit 1-4 outputs a stop signal to the arithmetic control section 1-6 for h or for the peak Vp of the envelope 2-3. This stop signal causes counters 1-7 to
is stopped, and each sensor 1-2a, l-2b, 1-
Delay time until elastic wave reaches 2c, Tth or T
p is measured, and from this the position of the camera element Ben 1-1 is detected.

By using a transparent object such as glass as the elastic wave propagation body of such a coordinate input device using elastic waves, it was possible to integrate the number of people by placing a display below the propagation body.

[Problem that the invention seeks to solve]

However, since the propagating bodies such as glass are stacked, the thickness of the propagating bodies has the disadvantage that parallax creates distortion between the position indicated by the pen and the display position. Furthermore, since the display and the propagation body are separate, there is also the disadvantage that the structure, such as support for each, becomes complicated.

[Means for solving problems]

In order to solve this problem, the present invention includes a display means in which a vibration propagation means and a display means are integrally formed.

(Function) Since the vibration propagation means and the display means are integrally formed, there is no parallax between the position on the display means and the position indicated by the vibration generation means.

[Example] FIG. 3 shows one example of the configuration of the present invention. 4-1 is a vibrator pen, 4-2a and 4-2b are sensors, 4-3 is a flat display such as a night crystal display, and 4-4 is an anti-reflection material for preventing edge reflection. As in this configuration, parallax can be reduced by using the display itself as an elastic wave propagator.

The sensor may be placed on the back side as shown in FIG. In this case, it can be implemented by changing the size of the front side substrate and the back side substrate of the display.

The display in the above embodiments is not limited to liquid crystal, but may be a flat display such as electroluminescence (EL), electrochromic (EC), or plasma display (DD).

Further, it does not have to be a flat display like a CRT. A similar effect can be obtained by arranging the sensor on the 5-3 CRT surface as shown in FIG. Also in this case, the arrangement is not limited to the front side of the CRT, but may be arranged inside the tube. When using the above-mentioned liquid crystal display, if the substrate pitch of the liquid crystal display changes due to external pressure, the alignment of the liquid crystal will be disturbed. In order to reduce the flicker caused by this disturbance, it is desirable to mix in as much glass fiber spacer or the like as a spacer to the extent that it is not included in the display.

The antireflection material may be placed over the sensor. By adopting such a configuration, it is possible to remove unnecessary vibrations around the sensor and increase sensitivity by lowering the Q of the resonance frequency of the sensor.

With the coordinate input device configured in this way, the coordinate input device shown in FIGS.
The usage method shown in the figure becomes possible.

That is, in FIG. 6, a virtual keyboard is displayed on the display 6-1, and the keys displayed at the positions corresponding to the positions indicated by the vibrator pen 4-1 are operated by the control device,
This can be recognized by the arithmetic unit 6-2 including a detection circuit and the like.

Further, in FIG. 7, a point corresponding to the position indicated by the vibrator Ben 4-1 can be displayed on the display 7-1.

In either case, it is possible to eliminate parallax between the vibrator Ben 4-1 and the position on the display.

(Effects) As described above, by attaching the sensor directly to the display, it is possible to generate j1% without being affected by parallax, and there is also the effect of lowering costs by simplifying the structure.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional coordinate input using elastic waves and a 7i position. FIG. 2 is a diagram showing the progression and detection of elastic waves. FIG. 3 is a diagram showing an embodiment of the present invention. Fig. 4 shows another embodiment of the present invention, Fig. 5 shows an example in which a CRT is used as an embodiment of the invention, and Fig. 6 shows an example in which the coordinate input device of the invention is used in a DPK. FIG. 7 is a diagram showing an example of use of the coordinate input device of the present invention.

Claims (1)

[Scope of Claims] Vibration generation means for generating elastic waves; Vibration propagation means for propagating the elastic waves generated by the vibration generation means; Detection means for detecting the elastic waves of the propagation means; and the propagation means. 1. A coordinate input device comprising: a display means formed integrally with the device;