JPH0315769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pixel detection device using a light pen, and more specifically, the present invention relates to a pixel detection device using a light pen. In order to do this, the brightness of the only pixel captured by the light pen is changed.

When capturing a pixel with a light pen, a method has been proposed in which the brightness of the captured pixel is changed in order for the operator to visually confirm that the target pixel has been captured. Here, changing the brightness means lowering the brightness of the captured pixel when the CRT screen is displaying at high brightness, and when the CRT screen is displaying at low brightness, This refers to increasing the brightness of captured pixels. However, if the light receiving entrance of the light pen is wide, there is a problem that the light pen will capture multiple pixels, the brightness of multiple pixels will change, and it will not be possible to specify the single pixel that should be input to the computer. .

The present invention was made in view of the problems of the conventional light pen pixel detection device, and by changing the brightness of only the only pixel captured by the light pen, the operator can visually check the pixel captured by the light pen accurately. This makes it possible to accurately input the desired pixel into the computer.
The present invention aims to provide a pixel detection device using a light pen.

The pixel detection device using a light pen of the present invention includes a pulse generation means that outputs one pulse signal when the light pen captures light from a pixel, and a pulse signal outputted from the pulse generation means, which and a switch means for receiving a pulse signal output from the pulse generating means and inputting the pixel captured by the light pen to a computer according to an input instruction from an operator, By changing the brightness of the pixels captured by the light pen, the operator visually confirms the pixels captured by the light pen, and by inputting instructions to the switch means, the operator transfers the pixels captured by the light pen to the computer. It is applied to an input pixel detection device, and includes a timer means for counting a predetermined refresh period starting from the point in time when a pulse signal is output from the pulse generating means, and a timer means counting the refresh period. The device is configured to include a brightness control means for the pulse signal outputted from the pulse generation means and a gate circuit for cutting off input to the switch means.

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. When the light pen 2 captures the pixels displayed on the CRT 1, light is emitted through the glass fiber 4.
It is input to the voltage converter 5. The output of the light/voltage converter 5 is input to a one shot circuit 6. Therefore, the one-shot circuit 6 outputs one pulse each time the light pen 2 captures a pixel.

The flip-flop 8 is according to the present invention, and is reset by a clear signal S at the initial stage. Therefore, the output of flip-flop 8 is at a high level. When a pulse is output from the one-shot circuit 6 in this state, the output of the AND circuit 7 becomes high level, and the flip-flop 8 is set. At the same time, the output of the one-shot circuit 6 is input to the brightness control circuit 12,
Change the brightness of CRT1 momentarily.

Since flip-flop 8 is in the set state,
The Q output becomes low level, and the AND circuit 7 is then closed. Therefore, one shot circuit 6
The brightness of CRT1 does not change even if it outputs a pulse. This state is the Q of flip-flop 8.
The timer 10 is started by the output, and after a predetermined time (refresh cycle 30 msec) has elapsed, the output of the timer 10 becomes high level, and this is input to the reset terminal R of the flip-flop 8 via the OR circuit 13. Continue until Therefore, even if light from other pixels is input to the light pen 2 during this time, it is blocked by the AND circuit 7 and becomes invalid. This makes it possible to change the brightness of only one pixel while not changing the brightness of other pixels displayed on the CRT 1.

When the flip-flop 8 is reset by the output of the timer 10, the light pen 2 detects the first detected pixel, and the AND circuit 7 opens again to change the brightness. When the light pen switch 3 is turned on in this state, the AND circuit 9 is set to a high level when the AND condition is satisfied by the output of the one-shot circuit 6 and the output of the light pen switch 3, that is, the AND circuit 9 is set to a high level by the target pixel. When this happens, it can be input to the computer 11.

FIG. 2 is an example of display of pixels on a CRT, and is an example of a case where the present invention is not implemented. That is, CRT
Pixels 15, 16, and 17 are displayed on the screen 14. Now, if you want to specify pixel 16, the light pen's light receiving port 18 captures pixels 15 and 16, so the brightness of the two pixels 15 and 16 will change, and even if you turn on the light pen switch in this state, It is not possible to confirm which pixels are input to the computer. To capture only pixel 16, shift the light pen position to dotted line 18',
This time it captures pixels 16 and 17, and again the brightness of the two pixels 16 and 17 changes, making it impossible to see which pixel will be input to the computer when the light pen switch is turned on.

FIG. 3 is an example of a CRT display when the present invention is implemented. Among the three pixels 19, 20, 21,
Suppose we want to specify pixel 20. Suppose that when the light receiving port 22 of the light pen captures the pixels 19 and 20 initially, the brightness of only the pixel 19 changes. Since pixel 19 is not the pixel desired to be input, suppose that the light pen is shifted to the position indicated by dotted line 22'. In this case as well, pixels 20 and 21 will be captured, but
The brightness change occurs only in the pixel 20, and it can be confirmed that the pixel 20 is input to the computer.

As is clear from the above description, according to the present invention,
Even if the light pen has a wide light receiving entrance and light from multiple pixels is input, by moving the light pen, it is possible to change the brightness of the only target pixel. Therefore, there is an effect that the target pixel can be accurately input to the computer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIGS. 2 and 3 are explanatory diagrams showing display examples of pixels on a CRT. 1...CRT, 2...Light pen, 3...Light pen switch, 4...Glass fiber, 5...
...light/voltage converter, 6...one shot circuit,
7, 9...AND circuit, 8...Flip-flop, 10...Timer, 11...Computer,
12... Brightness control circuit, 13... OR circuit.

Claims (1)

[Scope of Claims] 1. Pulse generation means that outputs one pulse signal when the light pen captures light from a pixel; and a pulse generation means that outputs a pulse signal when the light pen captures light from a pixel; and a switch means for receiving a pulse signal output from the pulse generating means and inputting the pixels captured by the light pen to a computer according to an input instruction from an operator. Pixel detection in which the operator visually confirms the pixels captured by the light pen by changing the brightness of the pixels captured by the light pen, and inputs the pixels captured by the light pen into the computer by inputting instructions to the switch means. In the apparatus, a timer means for counting a predetermined refresh period starting from the time when the pulse signal is outputted from the pulse generating means, and until the timer means counts the refresh period,
1. A pixel detection device using a light pen, comprising a brightness control means for a pulse signal output from a pulse generation means and a gate circuit for blocking input to a switch means.