JPS59191256A - Brightness adjuster for lightening tube - Google Patents

Abstract

PURPOSE:To enable correct adjusting within short time through easy operation while to enable self-diagnosis of system by employing two sets of signal comparison circuits. CONSTITUTION:First referential level (voltage) A to be matched with the input voltage is set in first voltage comparator and upon droppage of voltage from a light receiver below first referential level, an output is produced to light a lamp 9. On the other hand, second voltage comparator 8 has the second referential level (volage) B set below the first referential level (voltage). Consequently when setting the upper and lower limits of brightness as the referential levels A and B for the voltage comparator, the brightness of all lightening tubes can be controlled within predetermined range by adjusting the variable resistor in the lightening tube and setting to the positions for lighting two lamps 9, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for adjusting the brightness of an electric light tube, particularly an electric light tube used to construct a large display device by arranging a large number of tubes in a matrix.

The configuration of this conventional seeding device is shown in FIG. In this figure, (1) is an electric light tube, and although only one is shown in this figure, there are three types that emit red, blue, and green light.
Several hundred of these are arranged in a matrix, and by controlling their blinking states, they are used to construct a large-sized display device that displays various contents.

(2) is a variable resistor for brightness adjustment connected to the above-mentioned electric light tube, and by increasing or decreasing this value, the brightness of the electric light tube can be adjusted.

(3) is a brightness meter that measures the brightness of the above-mentioned electron tube, and as shown in the figure, the worker adjusts the above-mentioned variable resistor (2) while viewing the light tube (1) with his/her own eyes (4). The brightness is adjusted so that it falls within a predetermined range.

However, according to this conventional method, one electric tube
Adjusting one book at a time causes noise, so adjusting all tens of thousands of books takes a very long time and requires special techniques. It was extremely difficult to set the luminance of the tube within a predetermined range.

This invention was made in order to eliminate such inconveniences, and by using two sets of signal comparison circuits, it can be operated easily and in a short period of time (accurate adjustment can be made). .

An embodiment of the present invention shown in FIG. 2 will be explained below. (7) and (8) are signals whose input is the output signal of the light receiving device (6). The comparator is normally configured as a voltage comparator because the signal from the light receiving device is supplied in the form of voltage.

In addition, the first voltage comparison device (7) is set with a first reference value (voltage) that is compared with the input electrician, and outputs when the voltage from the light receiving device is below the first reference value. is generated to light up the lamp (9). On the other hand, the second voltage comparator (8) is set to a value lower than the first reference value (voltage IIE) as the reference value (voltage) to be compared with the person's voltage. It has a reference value (voltage) of Then, when the input voltage is higher than the second reference value, an output is generated to light the lamp (lO).

Therefore, if the standard value of @1 is A, and the standard value of $2 is B, the relationship between the input of each voltage comparator, the first and second reference values, and the output of each voltage comparator is summarized. The result is as shown in FIG.

As is clear from this figure, each voltage comparator (7),
When the input voltage to (8) is less than A (fj<Ff4), the first 'voltage comparator (7) generates an output, and when the input voltage is greater than B (however, the second voltage comparator (7) Since the voltage comparator (8) generates an output, only the lamp (9) lights up in the range where the input voltage is lower than B.
When the input voltage is between B and A, the two lamps (9) and (10) light up; In a large range, only the lamp (10) will be lit.

Therefore, if the upper and lower limits of the brightness of the light tube are set as the reference values A and A of the voltage comparator, then when adjusting the brightness, adjust the variable resistor (2) of the light tube and set the two By setting the lamps (9) and (10) in a position where they are lit, the brightness of all the tubes can be controlled within a predetermined range. According to this method, the time required for adjustment can be reduced to approximately 115 times compared to the conventional method.

Since the present invention is constructed as described above, anyone can easily operate it, and adjustments can be made in an extremely short time. Furthermore, since both lamps do not go out, self-diagnosis of the device can be easily carried out.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional device, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram for clarifying the operation and effect of the above embodiment. In the figure, (1) is the electron tube, (6) is the light receiving device, and (7) is the radiation tube.
(8) 7 is a second signal comparison device fft;
(9). (10) is a lamp.

Claims (1)

[Claims] 1. A light receiving device that receives the light emitted by the electron tube and emits a signal according to the amount of light, and a first device that receives the signal of this light receiving device as input.
and a second signal comparison device, and a lamp connected to each of the signal comparison devices and capable of being lit by the respective outputs, the first signal comparison device having a first reference to be compared with the input signal. The second signal comparator is set to a value lower than the first reference value, and is configured to generate an output for lighting the lamp when an input signal smaller than the reference value is received. 1. A brightness adjustment device for an electric light tube, characterized in that the device has a second reference value to be compared, and is configured to generate an output for lighting a lamp when receiving an input signal greater than the second reference value.