JPS592129A - Optical input device - Google Patents

Abstract

PURPOSE:To raise the performance and to realize a long life, by improving a pen-touch detecting means to a CRT, when an optical input device having both functions of a CRT light pen and a bar-code reader is used as a light pen. CONSTITUTION:A light emitting element 3 and a photodetector 4 are provided on the same surface of the tip inside of a pen body 1. When this device is used as a bar-code reader, light from the light emitting element 3 is reflected on a bar-code, it is received by the photodetector 4 and the bar-code is read, in the same way as before. When it is used as a light pen, the light emitting element is made to emit light only in a flyback time of a beam of a CRT, a reflected ray of its light by the CRT surface is received by the photodetector, by which it is detected that the light pen contacts with the CRT surface, and the light pen is switched to the operating state. The light pen is detected optically in this way, therefore, the detection accuracy is raised and its long life can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical input device that is installed in a personal computer, etc. and has the functions of both a phytoben and a barcode reader, and improves the performance by improving the Bent touch detection means used as a Light Bent. The purpose is to extend the service life.

2. Description of the Related Art Recently, computer-based devices, typified by personal computers, have become widespread in general households, offices, etc., and various input devices such as barcode leagues and light pens have been developed in conjunction with this widespread use. The barcode reader is an optical input device effective for writing programs into the combiator, and has a pair of light-emitting elements and a light-receiving element arranged inside the tip of a pen called the barcode reader, and one light-emitting element emits infrared rays. While emitting special light from the pen tip, the pen tip is scanned over a barcode that is encoded with a program and printed in black and white vertical stripes on a paper surface, etc., to read from the barcode surface. A stone that has the function of receiving reflected light from the special light with a light receiving element, converting it into an electrical signal, and reading a barcode. It is important to use special light such as infrared rays as an optical means for reading barcodes in this barcode reader in order to improve accuracy by eliminating the influence of external light such as visible light.

In addition, the light pen has a light-receiving element arranged inside the tip of the pen, which receives visible light and outputs electricity.
(Cathode ray tube) It is used as an optical input device where the pen tip is placed on the screen, and the raster light at the moment when the scanning line of the electron beam comes below is detected by the light receiving element and sent to the near/viator.

In this case, 〇RT where the combiator is placed
The position coordinates on the screen are detected and memorized by counting the time from the start of scanning of the ORT's electron beam to the output of the trigger signal generated when the light receiving element of the Light Ben detects the raster light, and at the same time Light up that position and turn it on! Draw various graphs and shapes on the screen. This type of light pen has an OR7 nib.
A built-in Bentouch detection means detects when the screen (more precisely, the face surface of ORT pulp) is pressed accurately without a large inclination, and extracts only the signal from the light-receiving element at that time as a significant signal. Signals other than the signal are treated as voluntary signals to prevent malfunctions.

The above-mentioned bend touch detection means in the 2-item screen include those equipped with an optical system movable part that moves when the pen tip faces the OR7 screen and allows raster light to enter the light receiving element, and the pen tip that moves when the pen tip faces the 0TIT screen. There are some that use a touch sensor with one switch and four switches that closes and sends the output of the light-receiving element to the combiator, but all of them have moving parts that move frequently, so the facing is short. And it is unreliable. There is also a pen that has a light-emitting element and a light-receiving element dedicated to touch detection built into the tip of the pen, omitting the movable part, but this has the problem of complicating the inside of the light pen and making it expensive.

By the way, a light ben and a barcode reader are often used together as a personal combination tool, and both a light ben and a barcode reader use a ben that can be held with one hand, and both have a light receiving element inside the original ben. Because of their similar structure, it is easy to combine a light ben and a barcode reader into one, and an optical input device that combines this has been proposed. This optical input device with Light Ben function and barcode reader function is a Ben with the same structure as a barcode reader but with Light Ben's Ben touch detection function added.It is convenient to combine both Light Ben and barcode reader into one. Although this method has the effect of reducing costs, it is difficult to put it into practical use because it has the aforementioned problems with the conventional single-piece light sensor Bent touch detection means.

The present invention has been made in view of these problems, and it combines a light vent and a barcode reader into one, and uses a light emitting element used in the barcode reader as a vent touch detection means when used as a light vent. The present invention provides an optical input device that can solve the above problems.

In the present invention, a pair of a light emitting element and a light receiving element are placed inside the tip of the pen, and when used as a bar food reader, the light emitting element emits light continuously, and when used as a light pen, an electron beam is displayed on the OR7 screen. The present invention is characterized in that it causes the light emitting element to emit limited light only during the retrace period when there is no retrace, and includes an optical bent touch detection means that confirms a bent touch by the light reflected from the ORT due to the limited light emission of the light emitting element. By combining the LightVen and the barcode reader into one and applying the light emitting element used as the barcode reader's light source to the LightVen's Bentouch detection means, Bentouch detection is an optical method that does not require any moving parts. Therefore, it is highly accurate, stable, and has a long service life, and the internal structure of the sensor is similar to that of a barcode reader, so it can be simplified.

The M configuration of the present invention will be explained below with reference to embodiments of the drawings.

Figure 1 shows an example of a pen structure when used as a barcode reader. (1) is a cylindrical ben body that can be held with one hand, and (2) is a screw that can be detachably attached to the tip of the pen body +1+. The installed cylindrical caps (3), (4), and (5) are a light emitting element, a light receiving element, and a lens system of 1 Jl fixed at a predetermined position at the tip of the ben main body (1). The light emitting element (3) is rounded to avoid the influence of extraneous light and emits special light, for example infrared, and this light passes through the lens system (6) to the cap (2).
The image is formed near the tip of the The light receiving element (4) is sensitive to both special infrared light and visible light from the ORT screen, etc., and outputs electricity. When using it, wire the code extending from the pen body (1) to the barcode reading circuit (6) built into the personal computer, as in the past. In this case, the tip of the cap (2) It is pressed lightly onto the barcode (8) printed on the paper surface (7) to scan the barcode (8), and during this period the light emitting element (3) continuously emits light. Then, the special light from the light emitting element (3) passes through the lens system (+1) and illuminates the barcode (8) as a light spot, and the special light reflected by the barcode (8) passes through the lens system +51 and reaches the light receiving element ( 4) The light receiving element (4) outputs a pulse signal according to the information of the barcode (8) to the barcode reading circuit (6). 8
This will be explained with a diagram. In this case f) % mark is the above pen body (1)
The hood extending from the hood is switched and connected to the vent touch detection circuit (9). The bent touch detection circuit (9) with
(a light emitting drive circuit 0 to which causes the light emitting element (8) to emit light upon input of one of the horizontal and vertical synchronizing signals, for example, the vertical synchronizing signal a, applied to the lateral light beam (11) of 1Fjl; The light-receiving factor (4) is opened at the input of d.
A monostable multi-pipe rake (14) that outputs for a certain period of time T by the trigger input of the signal passing through the gate circuit (13), and a light-receiving element (4). An amplifier circuit (16) that amplifies the output signal, and an amplifier circuit (16) that amplifies the output of the monostable multi-noise (ibrator 04)
An AND circuit (consisting of 1:00 It is set to 20m5.

On the other hand, as shown in Fig. 8, the Ben operation is performed using the cap (2).
Push the tip of the pulp (+o) at an almost perpendicular angle to the front surface of the 7-face part Oη of the pulp, and use the light-receiving element to receive the rusk light that shines when the electron beam scans the fluorescent film on the inner surface of the face part Qη. Detected by (4). At this time, the bent touch detection circuit (
9) performs the following operations. The screen of the CRT t]o) emits light only during the horizontal scanning period of the electron beam, and does not emit light during the blanking period when the horizontal synchronizing signal and vertical synchronizing signal are input. Therefore,
The light emitting element (3) is caused to selectively emit light by the light emitting drive circuit O''4 only during the vertical retrace period, which has a long period υ.Then, the cap +2] is accurately pressed against the 7th part rJη. In this case, special light is emitted only when the light emitting element (3) emits light, hits the fluorescent film (c), is reflected there, enters the cap (21), is detected by the light receiving element (4), and is detected by the light receiving element (4). During the retrace period, the gate circuit 01 is opened by the vertical synchronizing signal a, so the signal passes through the gate circuit ring and triggers the monostable multivibrator 04), and the AND circuit (1G) is output. The gate is closed for 99 ms time.

Therefore, when the cap (21) is in normal contact with the face portion 0η, the AND circuit 0 clause is closed for the scanning time of one frame of the ORT screen, so no matter where the position of the vent touch is, the light emitting element (4) detects the rask light during the scanning period of the ORT screen and outputs it to an external coordinate detection circuit etc. via the AND circuit 0@. On the other hand, the cap (2) is located slightly away from the face part (lη). ], or if the pen body (1) as a whole is tilted significantly and the bent touch condition is poor, the special light emitted to the outside of the cap (2) by the light emission of the light emitting element (3) during the retrace period will be dispersed. , the amount of light reflected back into the cap (2) is extremely reduced or completely eliminated, so the light receiving element (4) does not output during the retrace period, and the monostable multivibrator (14)
does not operate, the gate of the AND circuit θ6) remains open. In this case, even if visible light such as rusk light enters the light receiving element (4) during the scanning period of (2) and the light receiving element (4) outputs it, the signal will not pass through the AND circuit. It is treated as an invalid signal.

Note that the bent touch detection circuit (8) is not limited to the above circuit example.
For example, it is possible to use a horizontal synchronization signal for light emission during the retrace period, and in this case, the setting time of the monostable multivibrator 04) may be about 10100P. Also, when using it as a phytopen, use the character 7' (tl) tip 1wo (J n
In order to detect the reflected light from the inner surface of the face part (lη), the image point of the emitted light from the light emitting element (3) that has passed through the lens system (I5) is The length t of the cap (2) should be made shorter by the thickness of the face part η than the length tl when used as a barcode league so that it comes close to the inner surface of the face part +17). good.

As described above, according to the present invention, barcode
In addition to the convenience and cost reduction benefits of combining 4 top pens, detection accuracy is improved by optically detecting the pen tip when using it as a light pen using the light emitted from the light emitting element that is the light source of Barcode League. The structure can be simplified by improving performance, extending the lifespan, and making effective use of parts.

[Brief explanation of the drawing]

The drawings show each operation of the present invention, and FIG. 1 is when it is used as a barcode league! Partial cross-sectional side view,
Figure 2 is a diagram of the entire Pudafuku when used as a light ben.
FIG. 8 is an enlarged sectional view of the ORT face portion of FIG. 2.

Claims (1)

[Claims] (1) The pen has a built-in light-emitting element that emits special light such as infrared light from the tip, and a light-receiving element that receives visible light incident from the tip and the special light reflected from an external object and outputs electricity. It is equipped with a light ben function and a barcode league function, and the external object is 03 guns (
The cathode ray tube (cathode ray tube) screen has a built-in touch detection means that causes the light emitting element to emit light only during the retrace period of the ORT screen, receives the reflected light from the light receiving element, and detects the state of contact of the pen with the ORT using the output. An optical input device characterized by: