JPS6177997A - Operation diagnostic apparatus for light emitting element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a previous diagnostic device for light emitting devices, which is preferably implemented in copying machines and the like.

BACKGROUND ART Conventionally, copying machines have been equipped with a reduction key and a display lamp in order to copy an original image not only at the same size but also at a reduced size. When performing reduced copying.

When the reduction key is operated and pressed, the display lamp lights up to indicate that the reduction copy mode is in effect.

Problems to be Solved by the Invention In the prior art, when the 9 indicator lamp remains off due to some kind of failure, the display state is such that it indicates that a pre-copy operation at 1-1 magnification is to be performed. Therefore, if the operator performs a pre-copying process while forgetting that he is making a full-size copy, he will obtain a reduced-size copy. What's more, chanting with a set number of copies results in unnecessary copying and wasted time. I will do it.

The purpose of the present invention is to solve the technical problems described in f-i and fy.
Ii Even with a simple configuration, it is possible to reliably detect abnormalities in light emitting diodes.
#Jf'f of the light emitting element that can identify the operation: diagnostic mounting is provided.

means to solve the problem The present invention provides a switching element having a control f11 terminal.

A light emitting element connected in series with a switching element.

and an impedance element connected in series to the light emitting element.

fI+control terminal 1; means for providing a control signal;

and a control W for making the switching element conductive.

The voltage corresponding to the turning off of the light-emitting element at the connection point between the light-emitting element and the impedance satin and the voltage that corresponds to the state.

In response to the control signal for cutting off the switching element and the lighting of the light emitting element at one connection point between the light emitting element and the impedance element, #P'F, abnormal power generation occurs based on the combined effect of the fc main voltage. This is a light-emitting device diagnostic device that is characterized by identifying the occurrence of a defect.

Embodiment FIG. 1 is a nausea circuit diagram showing the configuration of an embodiment of the present invention. Copying mechanism 1t-j that performs the same size and reduction copying 4Il] operation panel 2 whose plane is shown in FIG.
The number of copies θ is set using the numeric keypad 3. Further, the copy separation is adjusted by the 0 degree adjustment key 4. Further, each time the reduction key 5 is pressed, the reduction mode and the same size mode are switched. The display lamp 6 is lit only in the reduction mode, and is turned off in the normal size mode.

When the print button 7 is operated at the time of starting copying.

The power-on display lamp 8 lights up and the number of copies is displayed on the 5 display means 9.

Numeric keypad 3. 'L) Degree adjustment key 4. Control of the copying machine 1 corresponding to the operations of the print button 7 and the reduction key 5 is controlled by a processing circuit 10 realized by a microcomputer or the like.

When the processing circuit 10 is operated to cause the copying mechanism 1 to make a copy 91, a high level signal is output on the line 15. Line 15nX is connected to the base of transistor 16 as a switching element. A resistor 17 and a reduced u'J light emitting diode 6 are connected between a line 12 on the high potential side of the power supply +Vl and a ground line 13 on the low potential side.

The transistor 16 is connected in series. Processing time Ff4
When a high level signal is applied from line 10 to line 15, transistor I6 conducts and light emitting diode 6
A torrent of light flows through the lamp and lights it up.

Next, when the reduction key 5 is pressed and a copy is made at the same size, a low level signal is applied to the line 15, the transistor 16 is cut off, and the first light emitting diode 6 is turned off.

18 connection points with 6 light emitting diodes and 17 resistors.

One input terminal 201c of the comparison circuit 19 is connected.

The other input terminal 21 of the comparator circuit 19 resistor 22°231
Thus, a divided reference ui pressure is provided.

When the voltage at the input terminal 20 is lower than the reference voltage at the input terminal 21, the comparison circuit 19Vi outputs a high level signal, and the voltage at the input terminal 20 is lower than the reference voltage at the input terminal 21.
When the pressure is higher than the pressure, a low level <g is derived.

The signals from these comparison circuits 19 are input to the processing circuit 10 via a signal line 24.

During reduction copying, when the signal applied via the line 15 is at a high level, the transistor 16 becomes conductive as described above, and the connection point 18 and therefore the input terminal 20 become conductive.
voltage is less than the reference voltage of the input terminal 21, therefore the output light of the comparator circuit 19 is high level tonal.

During full-size copying, the signal applied via line 15 is at a low level, transistor 16 is cut off, and the connection point]
8. Therefore, the input terminal 20 becomes a high level, which is higher than the reference level of the input terminal 21, and the output of the comparator circuit 19 becomes a low level.

In this way, when the light emitting diode 6 is performing a normal display operation, the determination result shown in the table 1 is obtained.

(Leaving space below) Table 1: When the transistor 16 is short-circuited due to a failure of the transistor 16 and remains conductive, the line 15 that follows the input operation of the reduction key 5 (the difference between the high level and the low level) Regardless of the 1 light emitting diode 6 if lit up to 1.When the reduction key 5 is operated and the signal on line 15 is at a high level, the signal on line 24 is at a high level. becomes high level as described above, and the processing circuit lO#-1 is determined to be normal and 1=11.When the reduction key 5 is operated to copy at the same size, even though the signal on line I5 is at low level, Because transistor 16Vi+j is connected.

The light emitting diode 6 is on, the voltage at the point 18 becomes low, and the output from the second line 19 becomes high level. The display state of one light emitting diode 6 is determined to be abnormal according to the combination of the low level signal outputted via the line 24 and the high level signal outputted via the line 24. At this time, the processing circuit 1O selects the reduction key 5 The copying mechanism 1 is controlled so as to achieve the same size copying that should be performed when the light emitting diode 6 is off, regardless of the operation.

Note that when the 1 light emitting diode 6 is normal, the copying mechanism 1iCj performs the 411+ operation as displayed.

Next, the infant state of the diagnostic device described above will be explained below using the flowchart of the third cause. Moving from step n1 to step n2, the reduction key 5 is depressed and the input display is read. Next, proceeding to step n3, a control signal is derived from the processing circuit lO to the transistor 16 rL
, In step n4, the output signal from the comparison circuit 19 is read, and in step n5, it is determined whether or not it is normal. If it is normal in step n5, in step n6, copy ah corresponds to the input content of reduction key 5, and copy 8M horizontal 1
It is carried out by If it is not normal in step n5, move to step n7.

Copy-spinning corresponding to the display shape of the light emitting diode 6, that is,
The copying mechanism 1 is controlled so that reduction copying can be achieved when the light emitting diode 6 is off in the reduction mode, and it is controlled so that a reduction copy can be achieved when the light emitting diode 6 is turned on in the life size mode. The copying mechanism is controlled so that the following can be achieved.

In the above embodiment, the display part of the light emitting diode 6 corresponds to the abnormality. Although the photo-cutting operation is performed in this embodiment, abnormal conditions may be notified by, for example, a warning sound.

Figure M4 is an electric circuit diagram showing a +rn configuration of another practical example of the present invention, and Figure 5 is a plan view of the operation panel 30. This implementation is similar to the previous example and has a corresponding F+l
The same reference numeral is given to the S portion. What should be noted is that the operation panel 30 is equipped with a note key 31, and when this sort key 31 is pressed, the display lamp 32 lights up and the mode is set to sort mode. If the sort key 31 is pressed again, the display lamp 32 is turned off and the sort mode is switched to the non-sort mode. Between the line 40 on the high potential side and the line 41 on the ground side, a resistor 17a and a light emitting diode 32 are connected.
A series circuit of the transistor 16a and the transistor 16a are connected in parallel. Also, 1g between line 40 and resistor 17a + connection point 42
A series circuit including resistors 17b and 17C is connected in parallel to the connection point 43 between the line 41 and the transistor 16a. Further, between the connection point 44 between the resistor 17a and the light emitting diode 32 and the connection point 45 between the resistors 17b and 17c,
A diode Dl is interposed. The cathode side of this diode DI is connected to the connection point 44, and the anode side is connected to the connection point 45. Another diode D2 is interposed between the 1x connection point 46 between the connection point 44 and the light emitting diode 32, and the connection point 47 between the connection point 45 and the resistor 17c.

The cathode In of this diode D2 is connected to the connection point 469. The anode side is connected to the first connection point 47.

When at least one of the light emitting diodes 6 and 32 lights up as a result of such a stroke, the output from the comparator circuit 19 becomes high level, and although it is difficult to say which light emitting diode is abnormal, Figure 6 (1)
, as shown in (2), fxl, different signals in the first period,
When derived from the processing circuit IO, it is possible to obtain determination results that cannot be shown in the @2 table.

Since one comparator circuit 19 detects whether or not the light emitting diodes 6 and 32 are normal or not, the circuit configuration can be simplified.

FIG. 7 of Table 2 shows a nausea circuit 1 according to an eleventh embodiment of the present invention. A light emitting diode 72 and a resistor 73 are connected in series to a transistor 71 serving as a switching element, and a power supply voltage +v2 is applied thereto. A control signal is applied from processing circuit 74 to the base of transistor 71 via line 75.

Light from the light emitting diode 72 is received by a phototransistor 76 as a light receiving element. light emitting diode 7
2 and a phototransistor 76 constitute a photocoupler 77. A resistor 78 is connected in series with the phototransistor 76, and a power supply voltage of 1 V3 is applied thereto. A line 79 is connected to the connection point between the resistor 78 and the phototransistor 76 at 41!
It has been continued.

A specific output is derived corresponding to the light receiving state of the phototransistor 76.

By using such a photocoupler 77, the voltage TR1 of the transistor 71 and its related circuits can be reduced by +V.
2. Even when the power supply voltage +v3 of the phototransistor 76 and its related circuits are different, signals can be exchanged.

When the line 80 between the photocoupler 77, the light emitting diode 72 and the transistor 71 extends for a relatively long time, e.g. It will be necessary to determine whether this is being done. For this purpose, the connection point between the light emitting diode 72 and the resistor 73 is connected to the processing circuit j'674 via the line 81.

The control signal sent over line 75 is low. 1, the transistor 71 is turned off, and the light emitting diode 72 is turned off () line 81.
A signal at the low level is applied to the processing circuit 74 via. Also, when the control signal sent via line 75 is at a high level, the transistors 71, i, I7
, the i-mounted light emitting diode 72 lights up, and a low level signal is applied from the line 81 to the processing circuit 74.

When the logic state m'Q- between the input from the z5 line 75 and the output from the line 81 is the same as described above, the light emitting diode 72 is normal! It is determined by the processing circuit 74 that IIIJ is being produced.
When one light-emitting diode 72 is turned on due to a fault, only one light emitting diode 72 remains lit, which causes a high level signal to be output from line 81 even though the control signal applied via line 75 is low level. The signal is sent to the processing circuit 74. Such an input signal is provided via line 75 and sent out via line 81.

The combination of logic states with the output signal is detected by the processing circuit 74 and determined to be abnormal.

Furthermore, when there is a disconnection between the transistor 71 and the light emitting diode 72, one light emitting diode 72t'iM remains lit, and even if a high level signal is applied from the line 75, the signal is sent out through the line 81. is a high level of 11. Such n input signals provided via line 75 and output (3) sent via line 81.
F4J 1rJT is determined to be abnormal by the logical state combination processing circuit 74.

In this way, the processing circuit 74 determines the logical state of the input signal given through the line 75 and the output signal sent out through the line 81, and determines whether an abnormal condition has occurred. By identifying this, it is possible to immediately know if the transistor 71 or the light emitting diode 72 is out of order.

is the 8th section + f-j of the present invention (“Electric circuit 1 of the embodiment of Le”)
It is Ql. Transistor 9 as the Swinging Prince
1, the light emitting diode 92, and the resistor 93 are connected in series, and a source air pressure +v4 is applied. 1tii is connected to transistor 91 via line 95 from processing circuit 94.
l j'ail signal cannot be given. light emitting diode 92
The light from the phototriac 96 is received by the phototriac 96.

The phototriac 96 is connected in series with resistors 97 and 98, and the gate electrode of the triac 99 is connected to the
, I continue to force. This triac 99 AC power supply 100
and the load 101, and conduction angle control is performed. Also, a capacitor 102 is connected in connection with the triac 991.

In order to determine whether or not the light emitting diode 92 is operating normally, the connection point between the light emitting diode 92 and the resistor 93 is disconnected from the processing circuit via a line 103. No. 43 of I to I level is applied to the pace of the transistor 91 through the line 95, and only the LT 1 light emitting diode 92 lights up, and at this time, a low level signal is sent to the processing circuit 94 through the line 103. When the control signal provided via line 95 is low, the light emitting diode 92 remains fully open and the output from line 103 is therefore low. Processing circuit 94
The combination of logic states of the input signal from line 95 and the output signal from line 103 is determined to
2 is correctly assisted.

When the transistor 91 is in the 1-2 state and the light emitting diode 92 remains lit, the output signal from the line 103 is at a low level even if the input signal from the line 95 is at a low level.

Based on this combination of logic states, the processing circuit 94 identifies that the light emitting diode 92 is operating abnormally. When there is a disconnection between the transistor 91 and the light emitting diode 92, even if the input signal from the line 95 is at the no-y level, the output signal from the line 103 ranges from no to no-y level (1).

Processing circuit 94 1) Light emitting diode 92 as described above
Identifies that there is an abnormality 01 fE I.

Although a transistor was used as the switching element in the disaster case described in MU, it goes without saying that a relay switch may also be used.

According to the present invention, it is possible to reliably identify the abnormality 11r' in the light emitting diode with a simple configuration.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention (rx air circuit width: 1 rod, 2 factors, operation according to the implementation example shown in Figure 1) (front view of flannel, salt 3).
The figure is a flowchart showing abnormal state identification paper, 箪4U
FIG. 5 is an electrical circuit diagram of another embodiment of the present invention. Fig. 5 is a front view of the control panel according to the actual example shown in Fig. 4, and Fig. fJS6 is a waveform diagram of the 'ju control (No. 2) from the processing circuit. Electrical circuit diagram of the embodiment. Figure 8 is an electrical circuit diagram of another embodiment of the present invention. 1... Copying machine type, 6.32.72.92... Light emitting diode, 16.16a, 7 ], 76.91...) transistor, 17.73.91... resistance, 10,74.
94...Processing circuit agent Patent attorney Kei Nishi part +■1 Figure 1

Claims (1)

[Scope of Claims] A switching element having a control terminal, a light emitting element connected in series to the switching element, an impedance element connected in series to the light emitting element, and means for applying a control signal to the control terminal. a combination state of a control signal for making the switching element conductive and a voltage corresponding to turning off the light emitting element at the connection point between the light emitting element and the impedance element, a control signal for cutting off the switching element, and a control signal for turning off the light emitting element; 1. An operation diagnostic device for a light emitting element, characterized in that an abnormal operation is identified based on a combination state of a voltage corresponding to a lighting operation of a light emitting element at a connection point between the element and an impedance element.