JPS5870133A - Detecting circuit for light signal - Google Patents

Abstract

PURPOSE:To obtain a detecting circuit which can detect the micro electric charge signals accumulated in micro equivalent electrostatic capacitors of charge accumulation type photosensors as a large output signal of low noises and low distortions irrespectively of the value of the large capacity capacitor to be added to an output line, is simple in a circuit constitution and have a high speed of detection. CONSTITUTION:When all switching elements are held open in a period 82, the electric charge accumulated in a capacitor 32 is discharged successively through said resistance element 33; therefore the potentials of terminals 35, 37 change (increase in this case) successively. When a switch 1 is closed in a detection period 83, redistributions of electric charge arise in respective capacitors 32, 41, 51, 62 and the potentials of a terminal 54 (similarly 35, 37, 52, 53) fluctuates. On the other hand, an OP Amp 61 operates so as to return the potential of said terminal 52 to a reference voltage level (ground level). When the above-mentioned operations are repeated, the potential of the terminal 53 is reset to the ground level in the final. Therefore, the capacitor 51 charges and discharges the electric charge tempolarily but in the final no electric charges are accumulated in the capacitor 51.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a production circuit which is used in a signal ejection circuit, and which is suitable for the emergence of a minute signal of a storage nuclear type photosensor.
Ru. In more detail, the small equivalent capacitance (capacitor with a capacitance of less than c) & It can be detected as a large output signal with low distortion, and the circuit configuration has a uniform quantity rate, and it is related to a 4 degree curved loading circuit.

Figure 1 shows an example of the production circuit that was required in the past, as well as the optical horizontal output circuit O.L and 2 are the switch elements C and below, respectively. (hereinafter referred to as photosensor, senna or photodiode), 4
is the wiring connecting the sensor 3 and the switch l, 5 is the switch,
ChilI! : The sui.

6 is the output terminal, 7 is the sensor 3
The voltage source for charging is a 50fi negative condenser. Figures 2 and 3 are equivalent circuits of the Senna 30. In Figure 0, 31 is an equivalent diode (hereinafter referred to as a diode), 32 is an equivalent junction capacitor (hereinafter referred to as a capacitor), and 33 is an equivalent resistance element (hereinafter referred to as a resistor). ), 34ij
It is a constant current source. Hereinafter, the 213th sensor 3t will be explained. An equal m circuit of J is used. Note that the resistance value of the nuclear resistance 33 changes depending on the light intensity. When the light intensity is strong, the resistance value is small, and when the light intensity is weak, the resistance value is large, and when there is no light pA radiation, the resistance value is usually vague.
Vertical sensor 3 is large enough to be considered as I@large, as shown in Fig. 4 V.
This is an equal m circuit of the 8g1 diagram shown using FIG. In addition, in the figure, elements having the same numbers as in FIGS. 1 and 2 are the same as the elements in FIG. 1 and 2WJ. 41ri wiring 4
It is a similar capacitor.

51d The 41+dii capacitor of the output line 5 often has an extremely large capacitance due to its structure.

FIG. 5 shows the timing of opening and closing of the switches 1 and 2 and the timing of the output signal waveform. 113 and 12 correspond to the switches 1 and 2, respectively, and the period when 11 or 12 is shown as high level and the period that is shown as low level corresponds to the period when the switch is closed and the period when it is open, respectively. Compatible. Next, the operation of this detection circuit will be explained using FIGS. 4 and 5. - It is assumed that during the operation period of 12 detection times 1, there is always an original contact with the intermediate failure sensor 3, and the resistance value of the resistor 33 is - within a certain f limit. In the current set period 14, J switch 2 is closed, so the capacitors so and si are short-circuited, and the accumulated charge is released. Therefore, the power level of the terminal 60 is set to the production area level as shown in numbers 7 to 13. On the other hand, since the switch l is also closed, the J capacitor 32r! charged,
The terminal 35μ is set to the ground level, and the terminal 36 is set to the voltage level B volts of the voltage #i7 (assuming E>O here).

During the accumulation period 15 during which the switches 1 and 2 are both open, the charge stored in the capacitor 32 is discharged through the resistor 33. As a result, the potential of the terminal 35, which was set at the ground level between the eyebrows 14, gradually rises, and B
approach. Now, at the end of the accumulation period 15, the terminal 35
represents that the potential of has reached V port (V≦8). At the same time, the capacitor 41 is charged during the period 15. Next, since only switch 1 closes during the detection period 16, the configuration +3
A redistribution of electricity occurs between 2.41 and 50.51, and 13
As shown in , the potential of terminal 6 rises slightly above the ground level. 4, the increase is the output 1JI- of this detection circuit.
number. The above period of 14°15.16 is one cycle of signal detection, and by repeating this, the signal detection is sequentially f? be called.

In the circuit shown in FIG. 1, since the output line 5 is usually long, the equivalent capacitor 51 is also 500 pF to 100 pF.
It is often a very large value such as 0 pF. Therefore, there is no need to separately connect the load capacitor 50,
The wrinkled capacitor 51 alone can be considered as a load capacitor. Therefore, the conventional cough detection circuit will be referred to as a capacitor type detection circuit hereinafter. Now - as an example, the said conde/su 32,4
1,50°51 (D capacitance values are o, zpr, 4, respectively)
．． 8pF'gQ, ZpF.

419.89F, and if the potential V at the terminal 35 is 1-5 volts during the accumulation period 15, the output signal will be approximately 1
y=v, which decreases to about 1/100. The capacitance value of the capacitor 51 is often larger than the previous 8J2'4 value. In this case, output No. 11 becomes even smaller. The biggest drawback of the conventional capacitor-type detection circuit is that since the curve of the cutting line 5 and the capacitor 51 are very large, the output signal becomes extremely small as described above. Also, the switches 1 and 2 are normally)'E
Since T, etc. are used, 74-to-through is superimposed on the output signal, and there is also one person who has a strange problem. For this reason, Dyna I and cleanliness are extremely reduced. Furthermore, output 1
Since No. 8 is very small, the output terminal 6 and the 4-width circuit t-bar,
It is necessary to connect the signal through the F1 circuit and amplify the signal. For this reason, the circuit becomes more complicated, the power consumption increases, and the low 87N
This results in extremely inconvenient results such as oxidation.

Another example of a conventionally used detection circuit is shown in FIG.
Since this circuit uses the resistive element 21 as a load,
Here, it is called a resistance type detection circuit.

hill! IK#, each 41 system having the same elements as those shown in FIGS. 1 and 2 is designated by No. 10. In addition, the said Sen f
Assume that Figure 2 is used as the price circuit for No. 3. 7th-
22 shows an example of a signal liquid type obtained from the tie 1 indicating opening/closing of the switch 1 shown in FIG. 6 and the terminal 6 shown in FIG. Note that, similarly to the figure 5, the period S when 22 of Rin 7- is at the bird level and the low level 0III correspond to the period between the eyebrows when the switch 1 is closed and the period when it is open, respectively. Next, the operation of the conventional resistance type detection circuit will be explained using FIG. 6 and FIG. Note that the row construction properties are the same as in Figure 4. It is assumed that the terminal 35 is set to the ground level in the final state of the current period 24. When the switch 1 is opened during the accumulation period 25, the charges accumulated in the capacitor 32 are irradiated with light and are discharged through the resistor 33 which has b)) growth. After that, the voltage at the terminal 35, which was at the II ground level during the period 24, gradually increases and approaches E. Assume that the potential of the terminal 35 reaches V volts at the end of the storage period 25 (V≦g). Next, detection period 26
When the switch l is closed, the potential ζ of the terminal 6 first rises from the ground level as shown in 23, and reaches the peak value KMI,
, then decreases and finally returns to pavement level again. Therefore, during this period, the transfer capacitor f32#i is charged again.

The above is one cycle of No. 11 detection, and since the accumulation and detection periods are not repeated, signals are detected one after another. Now - as an example, the condensate? The static m capacitance value of 32,41.51 is 0.21)F, 4.81)F, 5001)F
(!: Suppose that the dV power is 1.5 tk. The peak value of the output signal 23 at this time is about t7 at most.
mVICJginai. Similar to the nine conventional condenser type lead-out circuits described above, this has a serious drawback in that the signal read out is extremely small even though V is large. When the switch 1 is a FIST, for example, the output No. 15 appearing in the period 26 is superimposed with the sound of the switch 1 generated when the switch 1 is closed. Further, when the switch is opened, a negative direction (downward direction in the figure) noise is generated in the output signal 23 at the beginning of the period 25. In this way, since there is a large switch/ch/g s11 for a small signal output, the dynamic range and 8/N become very small. The issue is that the reading speed of the issue becomes slower. Therefore, it becomes impossible to completely read out the signal within the detection period (incomplete readout). That is, a foreshadowing occurs in which the potential of the terminal 6 does not return to the ground level at the detection glabella 26. Furthermore, the output signal is small and the waveform 23
As shown in , since the output 1d is not held, it is necessary to hold and increase the output signal. For this reason, it becomes necessary to add a buffer circuit, an 8/H circuit, an integral circuit, and an amplifier circuit, resulting in serious drawbacks such as oxidation of the 1g circuit, increased power consumption, and increased power consumption.

The purpose of the present invention is to solve the above-mentioned disadvantages of the conventional IJI, completely eliminate the influence of a large equivalent capacitor on the - side of the output line, obtain a large output, have a fast readout speed, and achieve 8/N8 and dynamism.

The object of the present invention is to provide a detection circuit with a large range and a simple configuration.

According to the present invention, a photodiode and a switching element for repeatedly charging and discharging the photodiode are connected, and the unit includes an integrating circuit including at least a condenser, a switching element, and an itch amplifier 1-1; The switch element side terminal and the inverting input terminal of the integrating circuit are connected to the wiring electrostatic capacitor 6.
114, the terminals on the photodiode side of the terminals are connected to a voltage source, the non-inverting input terminal of the armpit integrating circuit is connected to the reference voltage source, and the inverting voltage of the integrating circuit is An original signal detection path is obtained, characterized in that the input terminal 3 and the non-inverting input terminal are connected to each other via a switching element. Further: a plurality of the units and the integrating circuit are provided, and each unit has a switch element on the positive side O.
Connect the terminals to each other K11Jil! At the same time, the terminal and the non-inverting input terminal of the integrating circuit are connected via an output line, and the terminals on the photodiode side of the unit are connected to the upper limb terminal and the voltage source, and the non-inverting input terminal of the integrating circuit is connected to the terminal. An optical signal detection circuit is obtained, characterized in that the terminal is connected to a reference voltage source, and the inverting and non-inverting input terminals of the wrinkle integrating circuit are connected via a switch element. Also, m pieces (m”
There are n pieces (12,) of positive integers)
A total of m switching elements including a (a positive number), an m-th integral 1ω path, a first switching element, @2 switching element, m-th switch, and a switch element, Each boo, RiO
Connect the upper limb terminals that connect the switch element side AM elements in the 14th unit to one end of the first switch element, and connect the switch A element side terminals in the 211th unit of each block. Connect the ball chain terminal with K1141 through i1 to one end of the second switch element, and similarly,
Switch A in the llth unit of each group
Connect the terminals on the child side to the upper limb terminals that are inherited from each other and one end of the m-th switch element, and connect the at-th . Second,...-
・Connect the other ends of the m-th switch element to each other! Connect the I-connected bead chain end and the inverting input terminal of the wrinkle integrator circuit via the output line, and connect the photodiode side terminals of each unit to the II-connected bead chain terminal and voltage source. An optical signal detection circuit is obtained, characterized in that a non-inverting input terminal of an integrating circuit is connected to a reference voltage source, and the inverting and non-inverting input terminals of the integrating circuit are connected via a switch element.
L.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 8 shows a first embodiment of the present invention, in which 1 and 2r are switch elements, 3#i are charge accumulation type photosensors (hereinafter referred to as C and above sensors, photosensors or photodiodes), 4 is the sensor 3, 1 switch, and 4. Wiring to connect, 5 is output line/,
6 is the output terminal, 7 is the voltage # of -ratio value B volts (Here, B>0), 31, 32, and 33 are the equivalent diode and equivalent capacitor of the power sensor 3, respectively, ': 4
Biting resistance element corresponds to Figure 2. 41 is the 4-bit tundenna of the distribution @4, sl is the equivalent capacitor of the output line S, ・O
is the operand -I) (hereinafter referred to as OFA) 61.:I
ydenser 62. Integrating circuit 64 including switch element 63
Reference voltage of company voltage value IB volt + 1 [(In the following explanation, Bv& is assumed to be the ground level), 35° 36.37, 5
2.53 is a terminal, and 54 and 55 are inverting and non-inverting input terminals of the integrating circuit 60, respectively. Note that the circuit including the sensor 3 and the switch 1 is referred to here for convenience.
Call it 30. FIG. 9 shows an example of the timing of opening and closing of the switch elements 1 and 63 and changes in the potentials of the terminals 35 and 6.

71#i corresponding to the switch 63,
During periods when 1 or 72 is shown as ^ level and low level, each switch is in the closed or 110 state, respectively. 73 and 74 are the potential change at the terminal 35 and the tt level change at the terminal 6 (ie, the output signal), respectively. s'-1:875 will be described below.

The operation of α in the absence of the switch 2 will be described below. Note that, similarly to the description of the conventional detection circuit, it is assumed that the sensor 3 is constantly irradiated with light and that the resistance element 33 has a certain finite resistance value.

Further, the potential E of the voltage source 7 is assumed to be a certain positive value (for example, 10 volts), and the potential EkL of the reference solder pressure source 64 is assumed to be at the j-ground level. When the switch 63 is closed during the reset period 81, the capacitor 62 is discharged and the potential of the quadruplets 54 is
Since P Amp 61 , /) is at the ground level through the imaginary terminal, the potential of the terminal 6 also returns to the ground level as shown at 74 . Since the terminals 52 and 53 are also at the ground level at f1, the capacitor 51 is! ! ! L11
In the 0th order 43 wire 82 with K, any switch element is -
It is in the state of lIt. Therefore, while the ma stored in the capacitor 32 is sequentially discharged through the resistive element 33, the terminals 35 and 370m are not connected to the switch l in the next period J3, as shown at 73. The capacitor 32 changes sequentially (increases in this case) until the closing time.
and 411C accumulated ttto variation is terminal 35.37
This is the result of multiplying the change in potential by the phase of the capacitance of both capacitors. In the next detection period s3, when the switch l closes, each capacitor! ! , 41, 51.62, and the terminal 54 (also 35.37, 52 .
The potential of j3) changes, while OP ADIg) 61
By repeating the above operation of returning the potential of the terminal 54 to the reference voltage level (ground level) via an imaginary short circuit, the potential of the four terminals 53 is finally returned to the ground level. . Therefore, the scissors are buzzing temporarily.
? -51 performs charging and discharging of electric charge, but ultimately no electric charge is accumulated in the capacitor 51 (in the C steady state).

On the other hand, since the potential of terminals 35 and 37 is also at ground level,
The capacitor 32 is photoelectrically restored to its original state, and the code/de/su 41 is discharged. Therefore, as mentioned above, the period 83
It fluctuates just before the start of the nine-car capacitors 32 and 41.
At this point, the amount of variation in the voltage is calculated by %1-IE, and the amount of charge corresponding to the amount of variation is integrated into the capacitor 62.

Therefore, at 74 and 5, the potential at terminal 6 falls below the ground level and becomes an output signal component. Next hold period 8
4, even if the switch l is open, the output signal at terminal 6 is 7.
4, the value of the detection period 83 is held. At the same time, the original capacitor 32 starts discharging via the resistive element 33 (see 73) between 0 and #4m01 81, 82
83.84 is one period, and by repeating this cycle, signals are sequentially detected.

Now, the capacitance of the capacitors 32 and 41.62 is 0.2p each? , t8pF, 5.0. F, and if the potential at the terminal 35 rises by about 1 volt just before the yield switch l closes, then the output at the terminal 6 will change depending on the capacitance value K11li of the capacitor 51, which usually has a large value of 500 to 1.0009F. The signal voltage is approximately 1 volt. This voltage is extremely large compared to conventional detection circuits.

In addition, when the switch element 1 is made up of FNT→7L, switching noise occurs due to mutually opposing forces 1- when the switch is opened and closed. However, since the current signal #41 is integrated in the direction of mutual &'+'C cancellation by the capacitor 62, the signal damaged in the period 84 is an output signal with very little interaction. Become.

The case where the cough switch 2 is not added has been described above. Next, a case where Km switch 2 is added will be explained. Now cough sui, Chi 2's i;ll review status.

The timing of opening and closing of the switch 63 is the same as that of FIG.
2. If the potential at the terminals 52 and 53 rises to the ground level for some reason, for example due to a disturbance, the capacitor 51 can be forcibly discharged by the charge t due to the accumulated noise. Further, the opening/closing timing of the switch 1 is 75, and the switch 4
If the timing of 2 and 63 is shown at 72, the cough capacitor 32, 41.51 can be forced and rapidly reset during the reset period 81. In other words, when noise is superimposed on the wiring 4° output line 5 or the resistance element 70, or when the drive mode is extremely high speed, resetting using the transfer switch 1 and 2 is extremely effective. .

An actual example of the 1061Kth uninvented stripe 2 is shown. In this embodiment, the units 30 shown in FIG. 8 are expanded into a plurality of units and arranged into an array. , 410, 81°82.83 corresponds to the unit 30 in FIG.

Total of 1 reviews (/=correct! II number) I can chew. Note that each component in this figure is the same as the component with the same number in FIG.

FIG. 11 shows an example of the open/close state of each switch (10117) and the output signal waveform.

91 corresponds to the switch 1 of the unit 81, 92 the nuclear unit, the switch 1 of the unit 82, 93Fi the switch 1 of the unit 83, and the switch 94 corresponds to the switches 2 and 6, respectively, and indicates the high level and low level period of each waveform. correspond to the period when each switch is closed and the period when it is open, respectively. 95 is an output signal waveform superior to terminal 6 -b. In addition, the operation of the unfaithful 14i example is 41J! Example (Fig. 8) and 'Basically, there are four tanks. 'fc and each unit 81, 8
As shown in Fig. 11, the switches 2 and 83 are opened and closed in regular order and at regular intervals, and the switches 81
The J11 method is used to read out the sensor 3tJ times at 82.83 degrees. Therefore, the number 11 td does not protrude simultaneously from the sensor 3 with iIl number -.

Figure 12 shows the third embodiment of the present invention.
This is a further pc enlargement of the nine fruit example shown in Figure s10. That is, the configuration is such that m units (rn=positive integer) of the above units are used as one block, and n units (the number of units) are further provided. 101,103゜111.113,
121,123Fi Figure 8, /) Uniy) 30
Compatible with K. 101 and 103 constitute the first group and ri, respectively, and the first and m1l in the limb group p and ri, respectively.
It is a unit of l. Note that the second block in the first block
Units from th to (ml) $d are omitted in FIG. 12, and are shown as striped sword 1t'L. between fiK111,11
3 Each m2-1 Noa'f, the first in the
The m-th unit, 121 and 123, is the first m-th unit in the yh41/th professional unit. However, in Figure 12, the goo and ri from the F13th to the (n1)th eye are omitted. 201, 202
, 203 are switch cables, respectively, for each goo, the 1st unit (101, 111° 121), the 2nd unit (Ilr abbreviated), and the irises! 2. ) (103, 113, 123) K compatible. In addition, other components in the figure 1 with the same numbers in Figure 8
! Same as nest.

FIG. 13 shows an example of the open/closed states and output waveforms of each switch cord shown in FIG. 12. 300 corresponds to the switch elements 1 of uni, ) 101, 103 belonging to the first group. Similarly, K 310 is the second goo,
The switch element IK of ) 111, 113, 320 corresponds to the switch element I of ) 141, 123, which belongs to the 'dEna-th Gutsk. 401, 402, 403 are Rusui respectively.

This corresponds to elements 201, 202, and 203. SOO is Sui.

It corresponds to chip elements 2 and 63. Note that the high level and low level periods of each liquid type correspond to the periods when each switch cord is closed and open, respectively. 600 is an example of the output waveform from the terminal 6, where the high level corresponds to a quasi-voltage level, and the low level corresponds to a signal component.

Since the basic operation of this embodiment is completely the same as that of the first and second embodiments, the open/close states of each switch element and the order in which signals are successively outputted from each unit will be briefly explained here.

This period 6 (at 11, 11th floor goo, evening uni, )
Switch elements 101 and 103 are closed,
The switch elements 1 of the other professional units are all open. During the period 601, the switch elements 201, 202, 2
03 respectively; 1L 401, 402, 403, IjI are closed in sequence. Each switch element 201,! Ore2
03 are sequentially closed and then opened, the switch elements 2,
62, the circuit of FIG. 12 is set to zero each time. Therefore, Uni in the first block, ) 101,1
The signal 03 is sequentially read out from the terminal 6 at 5 as indicated by 600. The 111th Boo, Rino's m# Yu=,,)
In the first period 602 after the O1J was extracted, the
The switch cable 1 of the second professional unit opens, and the switch cable l of the 24th professional unit 111, 113 closes. On the other hand, Sui y + 1 child 201, 202, 203
As with a*sa, the circuit shown in Figure 12 is closed each time because it is closed sequentially. Therefore, in the period 602, signals are sequentially output from the 21st I-th goo, Rinouni, ) 111, 113. Thereafter, the process returns to the signal readout from the 0th-order first program, unit, unit, and g, which are sequentially read from the n-th program ρ, unit, and unit of interest. Thereafter, by repeating this process, the optical signals are read out and signals are not emitted from the sensors of a plurality of units at the same time.

As stated above, according to the present invention, no signal charge is accumulated in the extremely large capacitor of the output line 5. Therefore, in the present invention, the output signal of the conventional detection circuit is significantly smaller.

It can completely eliminate the drawback that the output line's capacitance value is extremely large, such as the extremely slow rate of cutting and output, and also has the nine outstanding benefits of being able to obtain a large output signal at a very low speed. . Furthermore, since the output signal is large, complicated signals such as buffer circuits and amplifier circuits are not recommended. Therefore, the circuit can be simplified, and an increase in noise and noise can be prevented. In addition, the dynamic range is greatly expanded because the shadows of feedthrough, switching, and noise can be suppressed. Furthermore, since the speed of the signal d-projection is fast, it is possible to completely d-project the signal and produce an excellent effect.

In the above, the present invention has been explained with reference to different embodiments, and in the above, the method of operation and the tie 1 node of opening and closing of the switch are only one example. , but not limited to the above example, of photosensors (photodiodes)! l! The direction of the equivalent diode used in the description (
The polarity), the voltage source, the size of the reference voltage source, and their characteristics are also examples, and are not limited to these.The switch element used in the example may be any switch as long as it is a Swiss-Nang switch, for example, transistor, FE
There is a T-shirt. Furthermore, the detection circuit of the present invention may be formed on the same semiconductor substrate as the scanning circuit that sequentially scans the switches to open and close them.

[Brief explanation of drawings]

Figure 1 is a conventional detection circuit, Figures 2 and 43 are Senna's equivalent circuit, Figure 4 is an equivalent circuit of Figure 1, Figure 5 is the opening/closing of the switch in Figure 4, the timing of No. 411, and the 6 is another conventional detection circuit, FIG. 7 is the opening/closing of the switch and signal timing shown in FIG. A diagram showing an example of the switch opening/closing timing and signal waveforms that drive the detection circuit in Figure 8!
Similarly, Figure 10 is a detection circuit showing the tjk2 embodiment according to the present invention, Figure J%11 is a diagram showing an example of the opening/closing timing and signal waveform of the switch that drives the detection circuit in Figure 1θ, and Figure 12 is a diagram showing an example of the signal waveform. FIG. 13 is a diagram showing an example of the opening/closing timing and signal waveform of the switch that drives the skin exit I path shown in FIG. 12. 1, 2, 63, 201゜202.203 is a switch element, 3 is a sensor, 4#'i wiring, 5 is an output line,
6L output terminal, 7 is voltage source, 31 is diode, 32
, 41, 50, 51゜62 is a capacitor, 33 is an a-d element, 34 is a current -160 is a branch circuit, 61 dOP A
mp, 64 t; l1jii quasi-voltage source, 81, 82
, 83, 101. It) 3,111°113.12
1,123 is uni, t. Fig. 1 Fig. 2 w, J3 Fig. 4 Fig. 5 Fig. 6 415 '#16 Fig. 7 Fig. 24 25 25 Fig. 8 Fig. 9 81 82 83 84 85 #+10
FIG.

Claims (1)

[Claims] 1. A unit connected to a photodiode and a switching element for repeatedly photodischarging the photodiode; The unit's terminals and the inverting input terminals of the unit are connected via the output line that connects the fourth wrinkle of the wiring, and the terminals of the photodiode of the unit and the terminal of the unit are connected to the voltage. - the inverting and non-inverting input terminals of the integrator circuit are wired through the switching element; Optical signal detection circuit λ A plurality of -ki unit, t and cocoon integral - path. The terminals of the main switches of each unit are connected to each other, the non-inverting input terminal of the integrator and the integrating circuit are connected via an output line, and the photodiode side terminals of the units are connected to each other. Terminal and voltage pin are connected, and the non-inverting input terminal of the integrating circuit and the reference voltage source are connected to Ii! Next, an optical signal detection circuit characterized in that the inverting and non-inverting input terminals of the integrating circuit 0 are connected via a switch element. 1. A group consisting of ■ units (m = positive integer) of the above-mentioned units, the above-mentioned integrating circuit, and 1 Ml
switch element, second switch. 1m11 total of first switch elements
Equipped with a switch element of #, the upper terminal of which the switch cable side and terminals in the first unit of the wrinkles are connected to each other and one of the first switch elements is connected to one another,
Connect the terminals of the second two parts of each boot, the inner O switch, and the chain element side to each other, and connect the terminal on the upper side and the terminal metal of one of the 20th switch and the element *ML, hereinafter one. Like, each group, evening m
Terminal metalwork of switch element in the second unit KJI
Connect the above-mentioned terminal connected to one end of the m-th switch element, and The other end of the switch element of the second...tsm is connected to the upper mounting plate and the inverting input terminal of the line integrating circuit via the output line, and the terminal on the photodiode side of the unit is connected to the inverting input terminal of the line integrating circuit. Connect the above terminals and voltage source to each other! #Continuously, connect the non-inverting input terminal of the integrating circuit to the base voltage source, and connect the inverting and non-inverting input terminals of the integrating circuit to
; An original No. 14 detection circuit characterized in that it is connected via a switch element.