JPS61166618A - Input device - Google Patents

Abstract

PURPOSE:To simplify the constitution of an input device by providing plural key array parts and opening parts on a base board together with sensors set at both terminal parts of each key array part and performing the detection of keys from the difference of time points during which the vibrations reach the sensors set at both ends of the key array part when the key array part is pushed. CONSTITUTION:Plural key array parts 6, 8... and opening parts 7 are provided on a base board 9, and sensors 1-5 and 1'-5' are provided at both end parts of each of parts 6, 8.... When the key at an optional position A is pushed among those parts 6, 8..., the vibrating waves produced with push of the key at the position A are transmitted like ripples within the part 6. These waves reach first the sensor 1' and then the sensor 1' with a prescribed delay of time. Then the arriving time points of the waves are detected by the sensors 1' and 1. The input position in the Y axis direction is detected from the time during which the vibrating wave reaches first the sensor. Then the input position in the X axis direction is detected from the difference of time points between sensors at both ends. In such a way, the input positions are detected with high accuracy in a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input device for detecting a suppressed position due to keystrokes.

[Conventional technology]

Conventional coordinate detection methods include resistive film method, capacitive method, and L
The resistive film method, which uses the FJD method, extracts the voltage corresponding to the coordinates by stacking sheets with conductive material arranged in a lattice pattern in the vertical and horizontal directions and pressing them at the desired position. was detected. Further, in the capacitive method, the capacitance value is changed by pressing the electrode portion, and the X and Y coordinates are detected based on the change in the capacitance. In the LED method, the coordinate position is detected by blocking the light between the light emitting element and the light receiving element with a finger or the like.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, since the resistive film method is a voltage division method, it is necessary to make the resistance value of the conductive material uniform, which results in poor yield and also reduces the transparency of the resistive film to 62°C.
Since it is as low as ~63%, the image becomes difficult to see when attached to the surface of CR1. In the capacitive method, the electrode needs to be a certain size in order to obtain changes in capacitance, which limits the input range and lowers the resolution.Also, since it uses capacitance, it may malfunction due to being affected by the surrounding environment. tends to occur. In addition, since the surface film is a film, it is easily damaged. The LED system will malfunction if the light is blocked by dust or the like. In the end, all of the above methods have problems such as high cost.

Therefore, the technical object of the present invention □ is to obtain an input device that can detect the suppressed position at low cost and without causing malfunction.

[Means for solving problems]

In order to solve the above-mentioned technical problem, the present invention provides a plurality of key arrangement sections and openings on a substrate, and includes sensors at both ends of the key arrangement section, so that when a key is pressed on the key arrangement section, both ends The mission is to detect the key based on the time difference between the vibration waves reaching the sensor. [Operation] The above technical means operates as follows. For example, when a person at the key arrangement section 6 is first pressed with a keystroke pen, the imaging wave of the keystroke pen propagates through the key arrangement section 6 in the left and right direction.

Then, the vibration waves are detected in the order of sensor 1' and sensor 1. In other words, the sensor where the vibration wave due to the suppression of the key pen reaches first detects the position in the Y-axis direction, and the sensor where the vibration wave reaches first detects the position in the X-axis direction, and the sensor detects the position in the X-axis direction. is called, converted to a key code, and output the key code every time the key pen is pressed.

〔Example〕

FIG. 1 is a diagram showing the configuration of the input device of the present invention, FIG. 2 is a diagram showing the Z-2 cross section of FIG. 1, and FIG. 3 is a flowchart of the input device of the present invention.

In the figure, 1 to 5. 1' to 5' are sensors that detect vibration waves caused by the depression of the typing pen, 6.8 is a key arrangement unit that transmits the image captured by the pressing of the typing pen to the sensor as a propagation wave, and 7 is a key. Openings 9 each represent a relatively hard substrate such as an iron plate to prevent vibrations caused by the suppression of the arrangement section 6 and the key arrangement section 8 from mixing.

To explain the operation in detail based on these figures, when you press any point on the key arrangement section on the board 9, for example, position A on the key arrangement section 6, the key arrangement section 6 is pressed in a ripple pattern. The vibration caused by the suppression of the pen propagates, and first the sen f-
The vibration wave reaches 1'. and sensor 1~5.1'
The count value of ~5' is reset and started when the imaging wave reaches sensor 1'. However, since the count value of sensor 1' serves as a reference, it is not allowed to start. Then, it is detected that the key pen is pressed between the sensor 1 and the sensor-1'. That is, the sensor 1' can detect the position in the Y-axis direction. Next, when the vibration wave due to the suppression of the typing pen reaches sensor 1, the count a@θ'' of sensor 1' when the vibration wave reaches sensor 1' and the imaging wave reaches sensor 1'. The suppressed position of the key pen is detected based on the respective count values from when the vibration wave reaches sensor 1. Therefore, the position in the X-axis direction can be detected from the force/runt values of sensor 1' and sensor 1. Can be done.

Next, when position B is pressed with the key pen, the vibration wave reaches sensor 2 first in the same way as when pressing A.
In this case, the position in the Y-axis direction and the position in the X-axis direction can be detected using the count values of sensor 2 and sensor 2, respectively. Then, by comparing each detected count value with a table in the ROM (not shown) determined in advance by measurement, it is converted into a key code corresponding to the count value of the two sensors, and when the key code is sent to the host side, it is pressed. The keys in the key layout section can be detected. This series of operations is performed every time the key pen is pressed.

As mentioned above, when pressing position A with the keystroke pen, sensor 1' moves the Y-axis direction, sensor 1 moves the X-axis direction, and then when position B is pressed with the keystroke pen, sensor 2 moves the Y-axis direction. The direction is as if the X-axis direction was detected by sensor 2'.
Regardless of the left and right sensors, the sensor to which the keystroke pen is suppressed first detects the position in the Y-axis direction and sets the count value to "0", and the sensor to which the vibration reaches next detects the position in the Y-axis direction and sets the count value to "0". The position in the X-axis direction is detected based on the sensor count value "0" and the sensor value.

In the above embodiment, five columns of sensors 1 to 5 and sensors 1' to 5' are shown, but it is also possible to change the number of columns depending on the need, and input by suppressing keystrokes is also possible. In this case, it is also possible to reset all sensors 1 to 5 and sensors 1' to 5' and operate only the sensors at both ends of the pressed key arrangement even though it has been started. The openings and the key arrangement section are provided alternately, for example, the key arrangement section 6.
．． If 8 is pressed continuously, if the opening 7 is not provided, the vibration waves pressed by the key arrangement part 6 and the key arrangement part 8 will mix, so this is provided in order to accurately detect the numerical value with the sensor. .

In the example, the sensor is provided in the horizontal direction, but it is also possible to provide the sensor in the vertical direction.
It is made of lead titanate with a side of 5 mm, a thickness of 1 mm, and a size of 25 mm.

〔effect〕

As described above, the input device of the present invention has a simple basic structure and can accurately detect the position where a keystroke is suppressed in the key arrangement section. In addition, key detection is performed based on the shock wave arrival time difference in only one direction, and since only an opening and a sensor are provided on the board, a low-cost input device can be obtained, and the suppression position is detected using relative values, making it highly reliable. This has advantages such as being able to obtain a gender input device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an input device of the present invention, FIG. 2 is a diagram showing a Z-Z cross section of FIG. 1, and FIG. 3 is a flowchart of the input device of the present invention. 1-5.1'-5'...Sensor 6.8...Key arrangement section 7...Opening 9...Substrate patent applicant Alps Electric Co., Ltd. Figure 1 Figure 2 Figure 2-2 cross section Figures

Claims (1)

[Claims] A plurality of key arrangement sections and openings are provided on the board, and sensors are provided at both ends of the key arrangement section, and when the key arrangement section is pressed, a key is activated based on the time difference in which vibration waves reach the sensors at both ends. An input device characterized by performing detection.