JPS5864581A - Input equipment for handwritten character pattern - Google Patents

Abstract

PURPOSE:To obtain high resolution and high reliability by detecting input position coordinates of an input pen on an input surface through plural beams of light or from the rotational angle of an ultrasonic sensor. CONSTITUTION:When the tip of an input pen is placed at one point P of an input surface 11, photosensors 13 and 14 traces toward the point P under the control of motor drive control circuits 15c and 16c by light emitted radially from the point P. When the angles of the sensors 13 and 14 to the X axis of the center during the tracing are theta1 and theta2 and the interval between the sensors 13 and 14 is l, the input position coordinates of the pen 12 are found from those theta1, theta2, and l by triangulation. This pen 12 emits an ultrasonic wave and ultrasonic sensors with strong directivity are usable as the photosensors 13 and 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a handwritten character/figure input device that uses light or ultrasonic waves to detect input position coordinates of handwritten characters or figures entered on an input surface.

Handwritten character/figure input devices that detect the input position th screen input by beckoning to a human hand are called data taglets, digitizers, touch sensor panels, etc., and are used as computer input devices, handwritten figure communication terminal devices, design drawing creation, etc. It has been widely put into practical use. This handwritten character/figure input device uses a touch panel method in which two resistive sheets or conductive sheets are stacked at a certain interval, and a light is illuminated on the display screen of a television screen. There are many methods such as a pen-applied method, a mechanical method that scans an arm parallel to the input surface, and a method that scans light in the X-Y direction of a plane parallel to the input surface. There are pros and cons.

For example, in the touch panel method, a transparent touch panel made of a resistive sheet or a conductive sheet is layered on the side of the display, and when you press your finger or electric pen on the touch panel, the position of the pressure point changes the box current ratio and voltage flowing through the touch panel. It is detected from the division ratio, and the versatility of using three inputs is very high. However, since the touch panel is almost translucent,
Only half of the light from both sides of the display passes through the touch panel, so it's hard to see, and the touch panel is cumbersome and expensive. The light-ben method is effective for selecting characters displayed on the screen of a television screen, but it can only be used on both sides of a screen such as a screen that is self-luminous or a self-luminous display. is extremely low.

In the mechanical system, for example, as shown in the first factor, a first arm (21
Then, rotate the second arm (3), one end of which is rotatably connected to the tip of the first arm (21), by 1J over the surface parallel to the input surface (1), and position the tip of the first core arm (3). The moving coordinates are detected using the rotation angle ψ of the second arm (21) and the rotation angle 9□ of the second arm (3) with respect to the i!! directrix of the input plane (lj. This method has a simple structure. There is, but the input screen filO
The visual field is partially blocked by the arm (21+3+) and becomes narrow, resulting in poor operability.

The optical scanning method still uses a large number of light emitting diodes and light receiving elements lined up around the input surface (VC), or a group of mirror pieces (5a) (5b) (6a) on the four sides of the input surface (4) as shown in 21st M1.
) (6b), a rotating mirror (7) and a light receiving element (8) are placed at both ends of the seven diagonal lines of the input surface (41), and the laser beam i10 from the external light source (91) is transferred to the rotating needle (7). At the same time, the laser beam (+01
When reflected by the iron pieces (5a) (6a), the input surface (
4) Parallel to either the X direction or the Y direction, the chain on the opposite side I is reflected again by the group (5b) (6b) and is incident on the photodetector (8) of -. A billiard scanner of one type is known in which the mirror angles of each mirror group (5a), (5b), (6a), and (6b) are set as follows. However, such optical scanning systems generally have low resolution because they are digital detection systems, and billiard scanners in particular are expensive because they require a large number of mirror pieces to manufacture and install.

The present invention has been made in view of the above-mentioned problem, and provides a novel 4-handed character/graphic input device using an input ben that emits light or ultrasonic waves.

Hereinafter, the configuration of the present invention will be explained with reference to a first embodiment of the drawings.

In Figure j, (11) - input surface, t12'd dedicated input pen, the tip of which emits light or ultrasonic waves radially along a plane parallel to the input surface (11) - a light source or ultrasonic oscillation The input pen (12) will be described below as a first input pen that emits light (infrared light).For example, a light emitting diode is used as the light source of the input pen 021, and its power supply A dry battery built into the input pen 02) is used. In this way, a cordless input pen (12) with good operability can be used.

Enter the following Ka3) &b:cB; IJ77 (IIJ c
D - side (7) It is a rotation angle detection unit that detects the rotation angle of the center of each optical sensor f13J (141) for each optical sensor f13J (141) parallel to the 2! quasi (13ji+41 is the fourth
As shown in Figure 1, insert the input pen (1
When light of 21 is incident (5), the output shows a peak, and as the light deviates from the center, it has a strong directivity condition in which the output decreases rapidly. Tracking a
Structure (15) tJ6: Track the light sensor (13' f14) so that its center faces the input point input to the input surface (11) so that the output of the light sensor 031 is always at the peak value. For example, a servo motor (1
5a) (16a), gear mechanism (Lsb) (lab), and a servo motor (15 &) so that the output is always at the peak value by feed puncture of the output of the optical sensor HJi141.
(16a) Motor drive control circuit for tracking operation (]-
5c) (16o).

The above-mentioned rotation angle detection section Oηα~ can be made into a non-contact rotation angle detection device that combines a permanent magnet and a magnetoresistive element as shown below.
Desirable for fine/f north and composition. That is, for example, as shown in Fig. J', an example of the built-in optical sensor (13) is shown in Fig. J'. The permanent magnet Oka is one magnetoresistive element whose magnetically sensitive surface is arranged in a fixed position near the permanent magnet Oshi and parallel to the magnetic axis of the permanent magnet Oshi. The magnetoresistive element (6) 20) has mutually orthogonal folds and (usually Z) stripes of magnetic metal thin film formed on the magnetic sensitive surface, the resistance value of which changes depending on the direction change of the external field. So, there is a constant voltage v between the input 'AM' of this stripe.

If we take the magnetic field of permanent ω, stone (19j) to each stripe and apply 1q at an angle of θ from the reference direction m forming the angle of Jo, the output voltage V between the output terminals is V=KV○sin, 2
θ (where K is a constant), and therefore, by finding V, the rotation angle of the permanent saltpeter (19) and the optical sensor (+37) is detected.

Upper 4e I Ii input pen (121 input position cocoon P
To detect the ischial bone (x, y) of 1θ division triangular side 1 method J
”, it will be exposed to the young ν. That is, when the tip of a human-powered pen (1/1) is input to a point P of a human-powered direction (!), each party's sensor (13
The bar 141 automatically tracks in the direction of P. Good luck,
The angles of the seven jitters of each party sensor (131i14j) with respect to the
.

If the distance between both optical sensors (+3 claws 14) is l (constant), then tanθ1 x, tanθ2 = '-x If we repeat this once to find X%y, we get "" ootθl+ cot I2 °l. ,
Input pen (12
A 9-directional ultrasonic sensor is used in place of the 1-light 7-sensor (lwa 4). In this case, a supersonant wave of about θ KHz is used, and a &-1 piezoelectric ceramic or the like is applied to the oscillation source and sensor, similar to the case of the human-powered position detection mechanism-11 light.

Note that the present invention is not limited to the above-mentioned embodiments; for example, two optical or ultrasonic sensors may be arranged in a diagonal array facing the direction of human power.

As explained in the Keijo theory, according to the 2i-invention, the display surface of the Grakuten tube, the display screen of printed matter, the existing blackboard plane of the electronic blackboard, etc. becomes the direct human power surface.
The versatility for human input is improved, and there is nothing blocking the field of view of the input W1, improving input operability. Since the input position coordinates can be detected as an analog quantity, an input device with high resolution and high reliability can be provided. In addition, by using the input pen d' battery-resistant sliding type, cordless operation is possible, and since only one sensor is required to detect the input assistance of this input pen, the overall structure is simple and easy to manufacture. Therefore, an inexpensive input device can be provided.

[Brief explanation of the drawing]

Figures 7 and 7. Fig. 2 is a schematic perspective view of the main part of a device for explaining two examples of conventional hand-scratched character/graphic input equipment; Output waveform diagram that does not explain the directivity of the sensor in Figure J, Figure J
Fig. 1 is a schematic perspective view of the main part showing an example of the rotation angle detection section in the younger brother JJ, and Fig. (1ri... input surface, (I muddy... input surface, 03R'4J
・Light (9) (or ultrasonic) sensor, (l51Il(...tracking IL(
1η (I8)...Rotation angle detection section. Mr. Shin Nippon Electric Co., Ltd. Mr. Gangwon Province
Hideo Ehara (10)

Claims (1)

[Claims] (1) An input pen that emits light or ultrasonic waves radially in all directions parallel to the input surface during input, and an input pen that is placed at different locations around the input surface to detect the light or ultrasonic waves from the input pen. an optical or ultrasonic sensor having elastic directivity, a tracking mechanism that rotates the optical or ultrasonic sensor in a plane parallel to the input surface in the direction of the input pen where the input value of the optical or ultrasonic wave becomes a peak value; A rotation angle detection unit that outputs the rotation angle of the ultrasonic sensor is provided, and the input position coordinates of the input pen on the input surface are detected using a plurality of lights or the rotation angle of the I''i ultrasonic sensor. A handwritten character/graphic input device that is on standby.