JPS58102222A - Malfunction preventing device for automatic dimming flash device - Google Patents

Abstract

PURPOSE:To obtain a correct automatic dimming flash, by displaying ''charging completion'', that is to say, ''light emitting preparation completion'' only when charging of a main capacitor for main light emission and a subcapacitor for stand-by light emission is completed. CONSTITUTION:To an electric power supply 1, a DC-DC converter 3 is connected through an electric power supply switch 2. To an output of the converter 3, retifying diodes (D) 4, 5 are connected, and to D4, a main capacitor (C) 9 for storing the light emitting energy is connected in parallel with a series circuit of a coil 12 a photographing main discharge tube 13 and a main thyristor 18. Also, to D5, a parallel circuit of a range measuring subdischarge tube 7 and a sub-C 6 for supplying the light emitting energy is connected. Resistances (R) 21, 22 detect charging voltage of C9, apply it to a comparator 50, and R21A and 22A detect charging voltage of C6, and apply it to a comparator 50A. Outputs of the comparators 50, 50A are connected to an AND gate 200, and only when charging of C9 and C6 is completed, a light emission diode 53 is made to emit light, and ''light emitting preparation completion'' is displayed.

Description

[Detailed Description of the Invention] The present invention is an automatic flash device (hereinafter referred to as an auto strobe) that automatically controls the amount of light emitted according to the distance of the subject.
In particular, the present invention relates to a malfunction prevention device for automatic flash photography in which the dimming level is controlled by preliminary flashing performed prior to main flash photography.

Conventionally, in this type of auto strobe, in order to ensure correct flash photography, the charge level of the main capacitor for main flash or the secondary capacitor for preliminary flash is detected, and when the level reaches a level above which flash is possible. A technology has been proposed that allows flash photography only at certain times.However,
For example, in a type that detects only the charge level of the main capacitor, the charge completion detection circuit takes a long time to indicate the charge completion state even if the sub capacitor has not reached the full state St immediately after preliminary light emission. There are cases where flash photography is executed regardless of the situation, and as a result, the flash energy for distance measurement is insufficient, the -1 distance result is inaccurate, and a photograph with an appropriate exposure cannot be obtained. there were.

In addition, in the case of a type that detects only the charge level of the sub-capacitor, even if the main capacitor has not reached the charge completion state mK immediately after full light emission, the charge completion detection circuit detects such a situation in order to indicate the charge completion state. Despite this, flash photography is often performed, and as a result, there is a drawback that inappropriate flash photography is performed in which there is no main light emission, or even if the main light emission is performed, a sufficient amount of light cannot be obtained.

The object of the present invention is to solve all of the drawbacks of these conventional devices at once and provide nine devices.

Fig. 1 is a circuit connection diagram of an auto strobe to which the present invention is applied and which is used as a flash photography device.
A known Do-Do converter 3 that boosts the low voltage of is connected.

Two rectifying diodes 4.5 are connected to the converter 3, and the anode of a main thyristor 18 is connected to the cathode side of the diodes 4 via a coil 12 and a main discharge for photographing w13.

Further, a parallel path consisting of an open distance measuring tube 7 and a sub-capacitor 6 for supplying luminous energy to the discharge tube 7 is connected to the cathode side of the diode 5. The sub-discharge tube 7
A trigger circuit 8 is connected to the trigger electrode of the trigger circuit 8, and an input terminal Kti of the trigger circuit 8 is also connected to a monostable multivibrator 130. A main capacitor 9 for storing luminous energy is connected in parallel to the main discharge tube 13tC, and a known trigger circuit IO is connected to its trigger electrode. On the other hand, the second output terminal of the trigger circuit IO is connected to the gate of the main thyristor 18 and a resistor 917 connected to the gate thereof.

15 and 16 are resistors forming a charging path for the commutating capacitor 14, and among these resistors, the resistor 15 is also connected to the anode of the sub-thyristor 19 for interrupting the main thyristor. 20 is a resistor connected to the gate of the sub-thyristor 19, 21.22
23 is a resistor for a voltage dividing circuit connected in parallel to the main capacitor 9 to detect the charging voltage of the main capacitor 9; 23 is a phototransistor that receives reflected light from an object (not shown); A constant voltage power supply 24 and a distance measuring capacitor 57 are connected. 50 is a comparator connected to the output terminal of the voltage dividing circuit 21 and 22, and the negative input ffi(-)m of the comparator 50 is The negative input terminal (-) of the comparator 51 is connected to the output terminal of the constant voltage power supply 24 in order to receive the reference voltage from the constant voltage power supply 24.

22A is a resistor of a voltage divider circuit connected to the sub capacitor 6 via a resistor 21A, and the output terminal of the voltage divider circuit is connected to the positive input terminal (+)K of a comparator 50A that determines the charge level of the sub capacitor 6. . 200 is a comparator 50,
An AND gate connected to the output of 5OA, 53 a light emitting diode (hereinafter referred to as an LED) connected to the output terminal of the AND gate 200 via a resistor 52 to indicate the completion of charging of the main capacitor 9, and 54, which will be described later. The output nA of the circuit 54 is a buffer circuit connected to the connection terminal 1 which is connected to the camera side connection terminal. Connected to the positive input terminal (+).

Reference numeral 41 denotes an npn transistor connected via a resistor 56, and the base of the transistor 41 is connected to the output 1 of the AND gate 200 via the resistor 55, and the emitter is connected to the negative electrode of the battery 1. Ru. An element 58 connected in series with the switching transistor 62 is a capacitor that forms the first timing circuit of the photometry circuit in the flash amount control circuit, and an element 59 connected in series with the switching transistor 63 forms the first timer circuit of the photometry circuit in the flash amount control circuit. A second capacitor forming a second time setting circuit, and a third capacitor connected in series with the switching transistor 64 to form a third time setting circuit of a nine-element 60Fi flash amount control photometry circuit. is the discharge resistor 1
42, 143, and 144 are connected to each other.

65, 66, and 67 are base resistors connected to the respective bases of the transistors 62, 63, and 64; 6B is a resistor connected to the base of each of the transistors 62, 63, and 64; npn) transistor, 69 is a resistor connected to the base of TR/DISTERO 8, 73.74.75#i Comparator element for selecting the dimming level, that is, the aperture value to be used, 7G , 71.72 are these comparators 73-7
5 is connected to a reference voltage supplying resistor; 61 is a resistor whose resistance value is varied according to the set film sensitivity; 76 to
78 is a nine AND gate connected to each of the transistors 62 to 64 through resistors 65 to 67 in order to turn on any one of the transistors 62 to 64 in synchronization with the generation of a light emission trigger signal to be described later. , 8° is an OR gate connected to the pace of the switching transistor 68 via an inverter 79 and a resistor 69, and 81 is a light emission stop signal generated from the comparator 73,
AND gates 82 to 84# connected between the comparator 73 and the sub-thyristor 19 to lead to the gates of 9 and 9;
This is an AND gate for guiding the nine dimming level selection signals, that is, the aperture value selection signals generated from the i comparators 73 to 75, to the latch circuits 85 to 87. The output terminal of the gate 83 is connected to the gate of the thyristor forming the latch circuit 86, and the output terminal of the gate 84 is connected to the gate of the thyristor forming the latch circuit 87. Reference numerals 85 to 87 are the latch circuits each formed of a thyristor, and the anode of the thyristor forming the latch circuit 85 is connected to the output terminal of the AND gate 128, and its cathode is connected to the transistor 1130 through the resistor 110. . Further, the anode of the thyristor forming the latch circuit 86 is connected to the output terminal of the AND gate 128, and its cathode is connected to the output terminal of the AND gate 128.
60, connected to transistor 1140 through resistor 111. Further, the anode of the thyristor forming the latch circuit 87 is connected to the output terminal of the ant gate 128, and its cathode is connected to the OR gate 89.

90-93 are inverters, 105-107 are resistors 101
-103 to the AND gates 94 to 96, these LEDs display the selected dimming level, in other words, the aperture value prior to the main light emission. 10
8 is connected to AND gate 1G9, 160 9 inverter, 110~112ef apn) transistor 1
Nine base resistors connected to paces of 13-115, 116
118 is a resistor for generating a running voltage according to the selected aperture speed value, 119 is a resistor, and 120 is the resistor 116 to 1.
18. resistors for forming a voltage divider circuit connected in parallel to each of the 1
21 is a buffer circuit; 122 is a comparator for determining the aperture f-number signal of the lens supplied from the camera side via a terminal; 125. 126c comparator 122
123 is an operational amplifier; 124 is a terminal for transmitting the aperture value signal to the camera side; and a resistor 127 connected to the negative input terminal of the amplifier 123; 128 is an AND gate; 131 is a monostable multivibrator (hereinafter referred to as a one-shot circuit) connected to the OR gate 80; 97. 98 is an anime game
), 104 is connected to the OR gate 99 via the current limiting resistor 100. The underexposure warning LED S a is supplied with a constant voltage from the camera side when the camera release button is pressed at the first stroke position tt. When the charging of the main capacitor 9 is completed, the terminal b transmits the shutter speed switching signal to the camera side, and the terminal b transmits the voltage corresponding to the selected aperture value signal from the strobe to the camera@, and also transmits the voltage corresponding to the selected aperture value signal from the camera side. C is a known synchro terminal, and d is a ground terminal for transmitting an open aperture value signal of the photographing lens used to the flash processing circuit.

In order to facilitate understanding of the present invention, before explaining the camera in the Moeki flash photography device, the operation of the auto strobe will be explained with reference to FIGS. 1 to 3.

Here, Figures J@2 (m) and e (b) show the relationship between the distance from the strobe to the liquid photographic object and the selected photographing aperture value, where the horizontal axis is the distance and the vertical axis is the aperture value. Further, FIG. 3(1) shows the charging voltage characteristics of the distance measuring intermediate capacitor 57, where the horizontal axis is time and the vertical axis is the charging voltage value.

In the output waveform of the ttits diagram rb>Fi raw shot circuit 130, the time t, ~t, is approximately several 10 (11s
).

FIG. 3(C) shows the discharge characteristics of the sub-discharge tubes 7, respectively. In the following explanation, it is assumed that the photographing lens attached to the camera is a bright lens, the output of the comparator 122 is LL, the output of the AND gate 98 is also LL, and the output of the inverter 108 is HL. .

First, when the auto strobe shown in the first figure is attached to the hot shoe (not shown) K of the camera and the power switch 2 is closed, the DO-DO converter 3 and the constant voltage power supply 24 start operating, and the main capacitor 9 and the sub capacitor 6th class charging starts. When the charging voltage level of the main capacitor 9 reaches a predetermined value, the output level of the comparator 5o changes to p.
- level (hereinafter referred to as LL) to high level (hereinafter referred to as HL)
). Furthermore, when the charging voltage level of the sub-capacitor 6 reaches a predetermined value, the output level of the comparator 50A is also inverted from LL to HLK. Therefore, the output level of the AND gate 〇 which receives the output signals of both comparators 50.5OA is also inverted from LL to HLK, lights up the LED 53, and informs the user that charging of both the main capacitor 9 and the sub-capacitor 6 has been completed. . On the other hand, the AND gate 200 also applies a high-level voltage to the base of the transistor 41, so the transistor 41 becomes conductive.
K invert.

Next, the photographer presses the shirt release button (not shown) to the first stroke position (at this position, as will be described later, the shutter release or the aperture adjustment of the photographic lens does not start, but the shutter release button (not shown) is simply pressed into the camera. 1 (only the optical circuit, display circuit, etc. starts operating), a constant voltage is applied to the terminal aK through the hot shoe of the camera, so the transistor 41 is inverted to 11 VC, as will be described later. The mode of the shutter speed control circuit inside the camera switches from natural light photography mode to flash photography mode. At the same time, the constant voltage generated at the terminal JIK is applied to the positive input terminal (+) of the comparator 51 via the buffer circuit 54, so the output level of the comparator 51 is LL.
In addition, the output level of the anime game) 128 is also inverted from LL to HL. When the output level of the AND gate 128 is inverted to HL, the one-shot circuit 130 is triggered, and the circuit 130 is set to the preset number 10 [
Since the HL output voltage is generated for a period of [μS], the trigger circuit is triggered at the same time as a pulse is generated from the 8-piece one-shot circuit 130, and a trigger pulse for triggering the sub-discharge tube 8 is generated from its output terminal. At this time, the rigid capacitor 6 is charged to a sufficiently high voltage, so when a trigger pulse is applied from the trigger circuit 8, a current flows from the capacitor 6 to the sub-discharge tube 7, and preliminary light emission is started.

Note that when charging of either the main capacitor 9 or the sub-capacitor 6 is not completed, the output of the AND gate 200 remains at LL, so the shirt release button/
Needless to say, even if the above-mentioned button is pressed, the preliminary light emission will not be performed and the photographing mode will not be switched.

On the other hand, since the pulse of the one-shot circuit 130 mentioned above is also applied to the AND gates 82 to 84 and the ORG 80, the AND gates 82 to 84 become in a standby state, the transistor 68 becomes non-conductive, and the distance measuring capacitor The short circuit of 57 is released, and the distance measuring photometry circuit starts operating simultaneously with the start of the preliminary light emission. At this point, since no light emission trigger signal is applied to the synchro terminal 0KLL, the transistors 62 to 64 are all kept in a non-conducting state, and the dimming capacitors 58 to 60a are all in an inactive state.

When the light from the discharge tube 7 reflected by the object upon the start of preliminary light emission enters the phototransistor 23, the output voltage of the ranging capacitor 57 increases with the passage of time in accordance with the photocurrent flowing through the phototransistor 23.

Furthermore, the capacitor 570's optical voltage remains constant even after the discharge tube 70 stops emitting light, depending on the intensity of natural light that illuminates the subject.
Figure (a) rises as shown by K [In Figure 3, IF
If the photometry is carried out for several tens of Cμs, and the brightness of the natural light illuminating the subject is low, and the distance to the subject cloth is medium, then 2 is the same photometry time, but the distance to the subject cloth is far, and the natural light is also low. 3 shows the change in the photoelectric voltage of the capacitor 57 when the brightness of the natural light is high, 3 shows the change in the photoelectric voltage of the capacitor 57 when the distance to the subject cloth is medium, and the brightness of natural light is high i, with the same photometry time). The charging voltage of the capacitor 57 during the distance measurement process is latched as distance information by the latch circuits 85 to 87 when the output level of the one-shot circuit 130 is inverted to LL several tens (μS) after the start of preliminary light emission. Here, the distance of the subject cloth is d2 (m
) to d3(m) and when only the comparator 75 becomes HLK due to the charging voltage of the capacitor 57, only the output level of the latch circuit 87 becomes HL, so each of the OR gate 89 and the AND gate 109 The output level at the output terminal becomes HL, and only the transistor 115 becomes conductive, and the resistor 118 is connected in parallel with the resistor 120K.

Resistor 118 for setting aperture value PI, for example F2.0
is connected in parallel with a resistor of 120 K, the buffer circuit 12
The potential at the positive input terminal of the amplifier 123 drops in accordance with the resistance value of the resistor 11g connected in parallel, and the potential at the non-inverting input terminal of the amplifier 123 also drops accordingly. As a result, a voltage is generated at the terminal bK that causes the aperture of the photographing lens of the camera to be set to the aperture value F1.

When the OR gate 89 becomes KHL as described above, the AND gate 78 and the transistor 64#-i each become ML and conductive.

In other words, the above-mentioned aperture value F is applied to the flash amount control circuit of the auto strobe.
1 can be set.

Furthermore, when the OR gate 89 becomes 1 (I) as mentioned above,
Output ij HL of AND gate 128, latch circuit 8
Since the output of 6 is LL, the output of the AND gate 96 is also HL, the LED 105 lights up, and the aperture of the camera's photographing lens and the light control level (aperture value) of the strobe are set to the above-mentioned aperture value FIKIJ4. Notify the photographer.

On the other hand, the distance of the subject's breath is d2(
m) to di(m), and when the outputs of the comparators 75 and 74 become HLK due to the charging voltage of the capacitor 57, the latch circuit 86.8
Since the output of 7 becomes HL, the output of AND gates 160 and 109 becomes HL via OR gates 88 and 89. For a second, transistors 114 and 115 become conductive, and the aperture value setting resistors 117 and 118 become HL. Connected in parallel to resistor 120.

Resistance 117. 118 is connected in parallel to the resistor 120, the potential at the positive input terminal of the buffer circuit 121 is equal to the potential of both resistors 117.118 connected in parallel to the resistor 120. The potential at the non-inverting input terminal of the amplifier 123 also drops in accordance with the drop.

As a result, in order to connect the terminal, the camera's photographing aperture is set to a smaller aperture than the aforementioned aperture value Fl (see Figure 2 (a)), that is, the photographing lens's aperture is set to F2 (see Figure 2 (a)), for example F.
A voltage with a value that adjusts to 4.0 is generated.

Also, when 88.89 becomes HL as described above, one input terminal of each AND gate 77.78 becomes HL.
Therefore, each of the transistors 63 and 64 becomes conductive.

In other words, the aperture value F2 described above can be adjusted to autostro & [the aperture value F2 described above can be adjusted to f&♀.

Furthermore, when 88.89 is inverted to 14L as described above, the output of the AND gate 128 is 11L1, and the output of the latch circuit 85 is #'iLL. Then, IJD, 1
06 is lit to inform the photographer in advance that the aperture of the camera's photographing lens and the light control level (aperture value) of the strobe will be adjusted to the aperture value F2 described above.

Also, the distance of the subject cloth is dl (m) in Figure 2 (a)
~O(m), and when the respective outputs of the comparators 75, 74, and 73 become HLK due to the charging voltage of the capacitor 57, all the latch circuits 85~
Since the output of 87 becomes HL, OR gate 88.89
and ANDGATE 109. The output of the transistor 160 becomes HL, the transistors 113 to 115 become conductive, and the throttling value setting resistors 116, 117, and 118 are connected in parallel to the resistor 120 of the voltage dividing circuit. When the resistors 116 to 118 are connected in parallel to the resistor 120, the potential at the positive input terminal of the buffer circuit 121 is equal to the potential of the resistors 116 to 118 connected in parallel to the resistor 120.
The potential at the non-inverting input terminal of the amplifier 123 also drops in accordance with the drop.

As a result, terminal bK sets the aperture of the camera lens to 11! from the aperture value F2 (see FIG. 2(a)). A voltage is generated to adjust the small aperture, that is, the aperture of the photographing lens, to F3 (see FIG. 2(a)), for example, F8.0KAll.

In addition, the output of the latch circuit 85 becomes HL, and the output of each of the gates 88 and 89 becomes HLK as described above. Each of 62 to 64 is in a state where it can become conductive. In other words, the above-mentioned co-diaphragm F3 can be set in the autostro.

Furthermore, when the output of the latch circuit 85 becomes HL, the output of the AND gate 128 becomes HL, so only the LED 107 lights up, and the camera's shooting aperture and the flash control level (aperture value) of the line-up shutter become the aforementioned aperture value. Notify the photographer in advance that F3K1m will be set.

At this time, since the output of the latch circuit 85 is KHL as described above, it becomes the output qLL of the inverter 90. Therefore, the output of the AND gate 95 becomes LL and the LED 106
does not light up.

t+ At this time, the output of the latch circuit 86 is KHL as described above, so the output of the OR gate 88 is HL, and the output of the inverter 9
The output of 1 is LL. Therefore and gate 96
The output of 9IJD105 is LL and will not light up.

When the shirt release button is pressed down again to the first stroke position after releasing the press F of the shirt release button (described later), a constant voltage is applied from the terminal alc camera side. When the charging of the rain capacitor 6.9 is completed, the preliminary light emission is performed again, and the distance measuring operation as described above is performed again.

Next, a case will be described in which a dark lens, for example, an F2.8 lens is attached to the single-lens reflex camera (not shown).

When such a lens is attached to the camera, the potential of the positive input terminal (+) of the comparator 122 becomes the negative input terminal (-).
Since the potential of 88.89 is also high, the output terminal of the comparator 122 becomes HL, and the output terminal of 88.89 becomes forced I? : Becomes HL.

Then, after the charging of the main capacitor 9 and the sub-capacitor 6 is completed, the above-mentioned shirt release button (not shown) is pressed after death.
When is pressed down to the first stroke position, the output terminal of the AND gate 128 becomes HL as in the case described above, the one-shot circuit 130 is triggered, and the one-shot circuit holds the HL signal for several tens (μS). is generated, the transistor 68 is inverted to the above-mentioned mechanically non-conductive state, and Illll
Set the photometering circuit to operable status S.

On the other hand, when the HL signal is output from the one-shot circuit 130, a flash is generated from the discharge tube 7 as described above, and preliminary light emission is performed.

Here, the subject is further away than the distance d3 (see Figure 2),
Number 10 (μS) determined by the output of the one-shot circuit 130
If none of the comparators 73 to 75 undergo HLK inversion even after the elapse of time, the transistor 113 remains non-conductive because the output of the latch circuit 85 is LL. Also at this time it was an anime game) 160. 109
The output of the latch circuit 85 is LL, and the output of the AND gate 9
The output of inverter 8 is HL, and the output of inverter 108 is LL because it is LL. Therefore, when the subject is as described above, all of the transistors 113 to 115 that determine the aperture #) Il of the photographic lens (not shown) maintain a non-conducting state, and the amplifier 123 The aperture value FO determined by the pressure ratio (see second opening), for example, Fl, corresponds to 0, and nine voltages are transmitted to an aperture control circuit on the camera side, which will be described later, via a terminal. Also, at this time, as mentioned above, the latch circuit 8
The output of 7 is LL, and the output of AND gate 97 is HL.
Therefore, the LED 104 lights up to notify the photographer that underexposed flash photography will be executed. Furthermore, when the subject is in the above-mentioned situation, it's oh goo) 88.
Since the output of 89 is forced to KHL, HL is applied to one input terminal of each AND gate 77.7B, and transistors 63 and 64 are in a state where they can become conductive. That is, the capacitors 59 and 60 are selected in the photometry circuit of the flash amount control circuit (hereinafter also referred to as a dimming circuit), and as a result, the aperture value F2 can be selected as the dimming level.

Next, when the object is at a distance between d2 and d3 (see FIG. 2(b)), and only the output of the comparator 75 is inverted to HL, the transistor 113 remains non-conductive as in the previous case. .

Moreover, the output of the inverter 108 is LL as mentioned above,
anime) 160. 109, so the transistor 114. ．． 115 remains non-conductive in this case as well. Therefore, in this case as well, the amplifier 12
3 is a voltage dividing circuit 119. A voltage corresponding to the aperture value FO determined by the partial voltage ratio of 120 is outputted to the camera side via the terminal. Furthermore, in this case, the output of the latch circuit 86 is LL and the output of the AND gate 98 is HL, so LED 1
04 is also lit in this case to notify the photographer that an insufficiently calculated flash photography will be executed. Further, in this case as well, the aperture value F2 can be selected in the side light circuit of the dimming circuit.

Furthermore, when the object is between distance di-d2 (see FIG. 2(b)) and only the outputs of the co/parators 74 and 75 are HLK inverted, the transistor 113 remains non-conductive as in the previous case. do. On the other hand, the output of the co/parator 74 is H
When the output of the latch circuit 86 is inverted to HLK by L, the output of the inverter 92 is LL, and the AND gate 98
The output of the inverter 108 becomes LL, and the output of the inverter 108 becomes HL.

Therefore, the output of the AND gate 160 becomes HL at the same time as the output of the two-way circuit 86 is inverted to HL, the transistor 114 becomes conductive, and the resistor 117 is connected in parallel with the resistor 120K. Also, the output of the AND gate 109 is also the latch circuit 8.
At the same time as the output of 7 is inverted to HL, the transistor 115 also becomes conductive, and the resistor 118 is also connected in parallel with the resistor 120IC. Therefore, the amplifier 123 is connected to the voltage divider circuit 117.
A voltage corresponding to an aperture value of 12 determined by a partial voltage ratio of 119 and 120 to 119 and 120 is output to the camera side through a terminal. On the other hand, the outputs of the latch circuits 86 and 87 for the LED 104 are both K.
The light is turned off for HL and the photographer is notified that 7-shot photography with proper exposure will be executed. Further, in this case as well, the aperture value F2 can be selected in the photometry circuit of the light control circuit.

Next, when the object is at a distance of 0 to dl (see second open can), and all of the comparators 73 to 75 are inverted to HL, the output of the inverter 108 is also changed by the HLK of the output of the latch circuit 86. 160° 109 is inverted to KHL when the outputs of the latch circuits 86 and 87 are inverted to HL, and the aperture value setting resistors 117 and 118 are connected in parallel to the resistor 120. . Further, in this case, since the output FiHL of the latch circuit 85 is inverted, the transistor 113 is also inverted to the conductive state 11, and the resistor 116 is connected in parallel to the resistor 120. Therefore, the amplifier 123 outputs a voltage corresponding to the aperture value F3 determined by the voltage dividing ratio of the voltage dividing circuits 116 to 120 to the camera side through the terminal. Note that the LED 104 does not light up in this case as well. - Since the outputs of the latch circuits 85 to 87 in the photometry circuit of the dimming circuit are both KHL, the aperture and value F3 can be selected. When the above-mentioned shirt release button is pressed to the second stroke position, the mirror (not shown) is activated as described later. The aperture diameter of the photographic lens (not shown) is determined based on the aperture value information predetermined by the preliminary light emission described above. After these operations are performed at 1, the shutter (not shown) is fully opened, and the 4 sink contacts (not shown) are activated, and the 7 ncro terminal 0 is grounded, the AND gate 132 inverts HLK, and the one-shot circuit 131 is turned on. When triggered, the one-shot circuit generates the HL signal for the time required for flash photography, for example 5-6 (ms). For this reason, one-shot circuit 1
In synchronization with the fall of the signal from 30, the transistor 68, which had been conducting, is turned non-conducting again, and the photometry circuit of the dimming circuit is turned into an operable state.

Further, since the signal from the one-shot circuit 131 triggers the trigger circuit IO, the main discharge tube 13 is supplied with electrical energy from the main capacitor 9 in a known manner.
The discharge tube 13 generates a flash of light that illuminates the subject. In this way, main light emission is started, and when the reflected light from the subject due to the main light emission enters the phototransistor 23, the capacitor 57 of the distance measuring side optical circuit and the capacitor selected at the time of preliminary light emission, for example, the capacitor 60 Charging will start. When the charge level of these capacitors 57 and 60 rises to a predetermined level and the comparator 73 inverts the HLK, the output of the anti-gauge 81 inverts the HLK, so the thyristor 19 is triggered and the main light emission is interrupted in a known manner. Seven exposure exposure shots are executed.

Next, the above-mentioned single-lens reflex camera used in the flash photography shown in FIGS. 1 to 3 will be explained with reference to FIGS. 4 to 6.

FIG. 4 is a block diagram showing the electric circuit of the camera, and the part surrounded by dotted lines shows the part built into the camera body. Incidentally, MD is an electric drive device, and EF is the S(cotropo) explained using FIGS. 1 to 3. Also, terminals a e b * C+
%@1 Illustrated terminals m, b, c, and d are shown. In FIG. 4, ■ is an integrated circuit (LSI) constituting a sequence control section and an automatic exposure control section, and P.

-P0 are input/output terminals for the integrated circuit I and external component connection terminals. The reference numeral is an integrated circuit (LSI) constituting the photometry section, calculation section, and time control section, and pta to h are its input/output and external component terminals.

M is an information display meter, Mg+ 0Mg* -Mgs
Each is electromagnetic! ), Tr is a transistor of the power supply holding circuit from the power supply BAT, LEDI-LED3 is a display light emitting diode, S ~ SW is a switch, VB, ~
V is a variable resistor for information settings and other settings, and RAT is a power supply battery.

In the figure, SW is a switch that is turned on when the aforementioned shutter release button RLB is pressed down to the first stroke position, and 8 is a switch that is turned on when the shutter release button RLB is pressed down to the second stroke position.
SW is the switch that is turned on when exposing the pulp, SW is the counting switch that is turned off when the shutter is opened, SW@
is an auto-manual shooting switch that is turned on when shooting in manual mode. SW is a switch for self-timer photography and is turned on when using the timer.

8 When photographing ducks using the electric drive device MD,
This is a switch that alternately switches between film winding operation and camera shooting operation, and switches to N and O1m when winding is completed, and to N and O when the shutter trailing curtain finishes running. 8W
, is the well-known synchro contact mentioned above, and is turned on when the shutter is fully open. Mgs is a magnet for automatic exposure control), Mgt
is a magnet for starting camera operation, and Mgs is a magnet for controlling shutter speed.

In the camera shown in Figure 4, photometry, calculations, and time control are performed analogously using the circuit element 2, and aperture control for automatic exposure and sequential control of various shooting modes are performed digitally using the circuit element 2. . The details of these operations will be omitted from the explanation of the detailed circuit diagrams of FIGS. 5 and 6.

FIG. 5 is a connection diagram of the circuit shown in the fourth diagram. In FIG. 5, A~AR, AR, ~A- are operational amplifiers, OP
, ~OP, are comparators, and A8 and OP. are controlled by control inputs (arrows). 301 is a constant voltage source, 30
2 is a switching circuit, a silicon photodiode for SPD #'i photometry, and a log diode for obtaining D, +i logarithmic compression characteristics. -1 of external individual parts is POSISTOR-S 04
- vt% is a circuit for eliminating rapid fluctuations in photometric values caused by the light source illuminating the subject, v- is a variable resistor for setting shutter time information and film sensitivity information, and ■8 is lens aperture information. The input variable resistor has a resistance value that changes depending on the open F value information through a signal transmission pin of a lens (not shown). M is the display meter, VB is the variable resistor for adjusting the shutter speed, ■ Bird is the variable resistor for setting the shutter time, and Bird is the aperture F of the photographic lens used.
The resistance associated with value information, Rβ4a is its brush, R
, 34b is the resistor pad surface, and the brush R34a slides on the pad surface R34b in conjunction with the resistor VR. The aperture of the lens of the brush 34 heat is the second
When the aperture value is greater than or equal to the aperture value between Fl and F2 in figures (a) and (b),
It slides on the pad surface R34b and separates from the pad surface R34b when the aperture value is smaller than the aperture value. That is, when a photographic lens with an aperture value larger than a certain aperture value is attached to the camera KM, a resistor R34 is connected between the terminal and the ground, and the lens has an aperture value smaller than a certain aperture value. When the lens is attached to the camera, one terminal of 834 is in an open state, and the resistor 1'L34 is not connected between the terminal and ground. C1 is a capacitor of the time constant circuit.

Next, the operation of the circuits shown in FIGS. 4 and 5 will be explained.

First, the shutter release getter RLB (see Figure 4) is pressed, the switch SwI is turned off, and then the transistor TR+ (see Figure 4) is turned on, and power is supplied via the power supply holding circuit. At the time of flash photography, at the start of this power supply, the preliminary flash of the strobe shown in FIGS. 1 to 3 is executed as described above. □The above-mentioned power supply starts. The light-receiving photovoltaic element 5PD (see Figure 5), which receives light from the subject through the photographing lens (not shown) of the camera, generates optical power corresponding to the subject brightness. . This signal is amplified by an operational amplifier having a logarithmic characteristic element in its return path, and brightness information (BY) is produced at its output.

In order to compensate for changes in the logarithmic diode D due to temperature K, an operational amplifier AR having a diode D having the same characteristics as the feedback path VCDs is provided, as well as a POSITOR bird 3 on the output side. Further, the output from AR is inputted to an operational amplifier AR through a POSISTOR bird, and this amplifier outputs 04. (2) The high frequency component of the input signal is attenuated by the characteristic (-) and is input to the flicker input terminal. Also, to this 1% terminal, shutter speed information (TV) and film sensitivity information (
8v) is set and input to the variable resistor VR,
These O information are calculated by humans and birds.

Aperture step number information Vtj,v is outputted to the output of AR, which is taken out from terminal P1m and sent to sequence control and automatic exposure control circuit I as shown in the fourth diagram. In addition, the step number information VAA v for the aperture is combined with the aperture aperture information (AVO) of the lens set in v'RQ, and the information corresponding to the aperture value (AV) is obtained as the output, and this is used to display the aperture value. The meter MK is displayed in the viewfinder, for example. Also, as will be described later, when the magnet Mg, which performs the camera start operation, is excited, the signal is sent from the terminal PUS to the comparator OP, IC, which controls OP. The output from the magnet Mgs is excited and holds the rear curtain of the shutter.

When the shutter starts, the switch S'w4 is turned off in conjunction with the start of the shutter front curtain, and 0.0 charging of the capacitor is started through the resistors VR, , VR, of the time constant circuit. Incidentally, during flash photography, as the shutter is fully opened, the fourth synchro contact SW shown in the figure closes, and the main light emission is performed in the process described above. The terminal voltage of the capacitor C6 marked # is applied to the non-inverting input of the comparator OP, and this signal and the voltage from the switch 302 are divided by Tori, Tame,
The partial voltage of HI and the reference voltage are compared at CP, and when they match, OP is reversed and the rear curtain is held, and the selector switch SW shown in Figure 4 is switched to the NO side and the circuit is reset. I lower it. In addition, the circuit surrounded by a dashed line in FIG. 5 is used to switch the shutter time circuit to the above-mentioned flash photography-dedicated time sent from terminal 1 of the strobe gF shown in Figures 1 to 3 during strobe photography. The A- and switch 302 are controlled by its output. ! Specifically, when the main capacitor 9 of the strobe BP shown in FIGS. 1 to 3 reaches a predetermined charge and becomes ready to emit light, the transistor 41 in FIG. This means that the first illustrated resistor 56 is connected between the terminal portion and the ground. If the strobe is not connected, or if it is not ready to emit light, the output of the six operational amplifiers R (see Figure 5) is the same as the voltage of the constant voltage source 301, but it is not ready to emit light as described above. In the completed state, the resistor 56 shown in FIG. 1 is connected between the terminal a and the ground, so that the operational amplifier AR
, 0 output exceeds the voltage of the constant voltage source 301 according to the resistance ratio of the resistor 56 in FIG. On the other hand, comparator C
Since the (+) input terminal of P, , OP, is connected to the inverting input terminal of the operational amplifier AR, the 70 voltage is the constant voltage source 3.
01, and the (-) input terminal has each k B+, ,
, Rlv and Rsa - R1@o connection points are connected, rounded, comparison @OP, in light emission ready state.

The output of CP is inverted and becomes LL. As a result, the states of the operational amplifier AR connected to the output of the cough comparators OP, OP, and the switch 302 are switched, and the feedback resistance of the operational amplifier AR is switched to a resistor. That is, during flash photography, the voltage according to the above-mentioned aperture value is applied to the KFi strobe BFOm resistor through the resistor. is applied to the resistors 21, 22 and K, and is calculated by the operational amplification akR*.
Output Ay. Furthermore, the resistance bird, ~ bird 1, operational amplifier AR
, Yo! 11 ARs, the output of ARs is calculated,
Meter M displays aperture information from the strobe to which terminal blc is applied. Further, when the output of the switch 302 Fi comparator CP is at a high level, a voltage is applied to the variable resistor VR, and when it is at a low level, a voltage is applied to the resistor -8. That is, when the strobe is ready to emit light, the magnet Mgs is controlled at the flash photography time according to the time constant of the resistor R,t and the capacitor C1, and when the flash is not ready to emit light, the magnet Mgs is controlled by the second time information resistor v bird. , the magnet Mgs is controlled according to the variable resistor V- and the capacitor's 0.0 time constant (time constant according to the setting value of the magnet dial (not shown)).

FIG. 6 is a circuit connection diagram showing details of the circuit I portion in FIG. 114. The cough circuit is constructed as a digital control circuit, and terminals P and 1Ptv are connected to external individual components or circuits as shown. In Figure 6, 0-1 to 0-20 are binary counters, P is a preset input terminal, QI...ζ@=QH'... is an output, and CP
is the clock pulse input terminal. That is, input P is HL
O time Qn is HL.

Qn becomes LLK. O20 is a clock/< pulse oscillator, which oscillates a pulse with a period determined by the time constant of the resistor and the capacitive jitter. 308 is an AD-DA converter, and A to G are its binary counters; LAD is a resistor network. 303 is a power-up clear circuit, 30
4 is a one-shot circuit, 305. 306 and 307 are respectively) IJ tube 70 tube circuits, and 1010 to 1
210 is a NAND gate, 201 to 213 are in/(-
Ta, Aya are operational amplifiers, OP, , OP, , OP
, and OF are converters. VR is a variable resistor for setting aperture information that is linked to the aperture value of a lens (not shown).

Next, the operation of the camera will be explained using FIG.

(1) The camera is now in the state where winding is completed, the shirt release buttons R1 and B (see Figure 4) are pressed down to the first stroke position, and when the winding operation is completed, the switch S is turned to N. , O to N, O. When the button RLB is pressed down to the first stroke position, the switch SwI is turned on as described above, the transistor Tr of the power supply circuit is turned on, and the circuit becomes operational. (B+ becomes HL) In this state, O20
is activated and the clock pulse is supplied from O20 to O-1 of the clock pulse counter. Also E.

When C1 is supplied to the circuit, the transistor Tr is initially off, and then turned on, so the transistor Tr is turned on for a moment.For this reason, the waag clear circuit 303 Output momentarily LL
Then, the output of the NAND 1090 becomes m-HL, and the counters O-1 to 0-20 are preset.

In addition, the clip full tube (FF) 305 is also in its initial state, that is, g
t is preset to HL. Also, with the inverted output ratio of E, F
F 306 is also set to the initial state and the output ratio is HLK
eru. Furthermore, F F' 307 is also set to the initial state by the inverted output E of E, and the output E4 is set to HL.

As a result, the preset input of the AD-DA converter 308, that is, the output of M01210 becomes HL, and the counter ANG is preset. Also, since E is HL, operational amplifier ABQ is controlled and its output is connected to ground. Here, since the output of CP is HL, the automatic exposure control (AI) magnet Mgl is not excited in this state. As described above, in state (1), B,,g,.

Both E and E4 are KHLK.

(When used in the state of 21 (1) and in manual shooting mode, turn on the switch S at this time. By turning on SW @, the output of the inverter (Iv) 212 is changed to HL, and the above-mentioned The transistor T- of * −w , −< sita 0
When 1 is charged, it flips from on to off, and NAND 1
090's single person is designated as HL.

Also, at this time, all other inputs of NAND 1090 are HT.

Therefore, the output of the NAND 1090 immediately changes from HL to LL, and the counters C-1 to C-0-20 start counting operations. Therefore NAND 11600
Å force is the output of the counter q, and Q10 are both KHLK:
When running, all become HL and NAND 1160 FiL
Output L. This causes an output from the light emitting diode LED1 through the terminal P, and this LED1 lights up to indicate the manual mode.

(If the light from the subject is below the reference value in the state of 31 (1) or (2), in this case, as mentioned above, the light metering circuit shown in the figure 5 will start when the switch Sw is turned on by pressing the release button RLH. is operating, the aperture step number information V-□v input from the photometric circuit input to terminal Pl is compared with reference voltage Vc,
V△Av is strangely lower than VC (Vmu request wY (Vc
). Therefore, the output of the comparator OP is HLKeD, and the input of the kite M1150 is the counter operating as described above, so when both q and 4 become HLK, all become HLK.
The output of NAND 1150 becomes LLK. As a result, the light emitting diode LBD2 connected to the terminal P lights up to display a warning that the brightness is low. The light emitted from these LIDs blinks in accordance with the period of the counter, and is displayed, for example, in the viewfinder.

(4) When the shooting operation is started by pressing the release button RLB to the #I2 stroke position from the state of '11 (1) where low brightness and auto/manual are checked by the above-mentioned (2) ia) o operation. , the switch SW is turned on in conjunction with the operation up to the second stroke position. When S bird is turned on, the output of Iv202 becomes HLK, and the output of Iv201 is also HLIIC because Sw is connected to No, and in this state, the power supply voltage E
, and the constant voltage Vc are the humparator OF.

The partial pressure value of E is sufficiently high compared to VcK (
Since the outputs of (the power supply voltage is sufficient) and CP are HL, all the inputs of the NAND 1070 become HL due to these signals, and the M mountain 1070 outputs LL.

Now the output of NAND 1020 becomes HL, so F
F 305 is inverted and its output E changes from HL to LLK.

Also, due to the output of NAND 1020, the output of Iv 203 changes from HL to LLK and becomes Tr through terminals P and 4.

Since 8 is connected to the ground to the base resistor of Tr*Vi, even if the switch S is turned off, Tr*Vi is kept in the on state and the power supply to the circuit is maintained. From the above, B becomes LLK, so Iv 204 (7) Output E1 becomes HL, and the outputs of the one-shot circuit 304 are Iv 205 , 206 , 207
The delay time due to K becomes LLK, and then NAND 1
09o output becomes m-HLK and counter 0-1 to 0-
20 is preset again and then NAND 1090
is inverted from HL to LL-7 and starts counting clock pulses CP from 08C. Also, E, becomes LL.K, second AD-DA converter 308 operational amplifier A
The control of R is released and the output of AR% is released from the ground state. As a result, the output of AR, is transmitted to the input terminal of OF, and since the output of AR, corresponds to the set state LK of the preset counters A-G, the potential of the inverting input terminal of CP is a high potential. Therefore, CP is reversed and A
H magnet) Mgl is excited. NA in the state of jin
Input signal E to ND 1200 is HL.

Since the output of op is HL and the output of NAND 1190 is also HL, the signal of output Q1 of counter O-1 is transmitted through WAND 1200 to counters AG of the AD-DA converter.

(5) In the above state, when switched to manual mode (8 birds are on), the NAND of converter 308
The output of 1210 becomes HL, and the papermaking counters A to G maintain their preset states. Also, when switching to auto shooting mode and tail (SW, #off), NAN
D1210(7) output changes from HL to LL and counters 8 to () start counting. From this trap, the output of the operational amplifier AR falls stepwise, and when the signal V8O from the photometric circuit and the output of this AR become equal, the converter O
F, is inverted, outputs the LL signal, and NAND 12
The output of 00 outputs HL regardless of ζ, and the output is
-G's counting operation is stopped, and a digital value corresponding to V crystal vK is stored in counters A-G. In addition, honey 120
By controlling OP with an output of 0, the influence of noise during counting by the counter is removed.

(6) When using the self-timer in the state of (4).

At this time, the switch S kite is on and the output of Iv 208 is HL, so the counter output ζ.

When the sound became Kl-II, NAND 1ioo
The output changes from HL to LLK. This is NID112 from K
0 is output to HL, and the output of Iv 213 is LLK. is HL, so FF
306 is inverted, and its output E changes from HL to LLK.

Therefore, it outputs NAND 1130 FiLL, and NAND
D The output of 1090 becomes HL and the counter 0-1-0
-20 is preset again. When the counter is preset, Q, ~Q, , becomes LL, f, NAND 1
120k is LL, so NAND 1130 is HL
At the ninth point when K returns, the output of the NAND 1090 becomes the L sum, and counting is restarted.This ninth El changes from HL to L.
The NAND 1180 from the time of death when it becomes L until both Q, , and Q become KHL becomes LL and Mg is excited, and a camera start member (not shown) is actuated to start the photographing operation. In other words, when using the self-timer, the trigger is counted from the second stroke position of the release button RLB (see diagram #I4), and the second control pulse is output with a delay of the counting time until both QtseQ** become KHL. K becomes.

(7) When not using the self-timer and in auto shooting mode. At this time, 8% of the switches are turned off. Therefore, the output of Iv 208 is L L , Iv 209
The output of is HL, and the output from the counter is Q, , Q
, and Qts both become HL, NAND 11
The output of 10 changes from HL to LI.

From this K, the output E of F F 306 is Qa from the second stroke position of the release button RLB? Qa t4
,. When both become HL[, HL is reversed to LL. In other words, when not using the self-timer, release button R
The output E of F F 306 from the second stage stroke position of LH is the counter Q.

Q,,Q,. The camera start member (not shown) is activated in a shorter time than when the self-timer is used as described above, since the count reaches LL after the counting time until both reach ML.

Note that when the crane reaches LLK at the second stroke position of the release methane RLB, the outputs of the NANDs 1150 and 1160 both become KHI, and the displays I, ED 1, and FJ) 2 are turned off.

Also, when using the self-timer, when E is at LLK, the melon is at HL, and when E is at HL and 8 kites are on, Q14 tQI
When I becomes KHI, the output of NAND 1170 becomes LLk, which causes LBD3 to blink through terminal P. LB
D3 blinks to indicate that the self-timer is in use, and when the timer operation ends, E is set to LLVC and NA is set.
ND 1170cD output is HL! IC becomes LBD
3 goes out. Also, when the self-timer operation ends and Ha changes from HL to LLKfk as described above, Iv 211
The output of becomes HLK, F F 30712) Output I
L u HL VCfk Le.

Also, since Es is HL, the counter output 4゜Qs is KHLk, and the NAND 118 (1) output is L.
It becomes L, and as mentioned above, it is for camera start! Gnet M
g is excited and the camera starts photographing operation, Q, ,
When Q and Q are both KHLK, the output of NAND 1140 becomes LL and the excitation of Mg is refreshed. Also, the Mgm
When CP is excited, the magnetic dynamic signal of Mgm is applied to the control terminal (P□) of the comparator circuit OP in figure t45, the output of CP becomes LL, Mg is excited, and the rear curtain of the shutter is held. At the same time, F F 307 is reversed and E4
changes from HL to LLK, and the output of NAND 1090 becomes H
LK and set the counters O-1 to 0-20 to the preset state.

According to the above, #: JMg is excited, and in conjunction with this, the camera start member (not shown) is activated to start the photographing operation,
In conjunction with this, a well-known member unlocks the raag and aperture information variable resistor vR9, operates an aperture drive member (not shown), and aperture is performed. The output of AR and the reference value Vc are compared by a comparator CP, and when they match, CP.

HLK is inverted, the AB control i-magnet Mgl is demagnetized, and the above-mentioned aperture of the photographic lens is clamped, thereby determining the aperture value of the photographic lens. At this time, the shutter front curtain is moved by a member not shown, and when the shutter front curtain is moved, the switch 8W4 shown in FIG. 5 is turned off, and the resistors VR, , VR are turned off.

through capacitor 0. is charged, and after the set shutter time, OP is reversed, Mgm is de-energized, the shutter trailing curtain is run, and the photographing operation is completed.

In addition, when the camera shown in FIGS. 4 to 6 and the strobe EF are connected through II4 terminals I b, c, and d, and the strobe is in the light emission ready state mK as described above, the How to get the operational amplification good person in Figure 5 (VΔ, v)
is applied to the b terminal and corresponds to the aperture information voltage from the nine strobes, and similarly, the (-) of the comparator CP in FIG.
) The voltage applied to the input terminal (V, center, v) is the same as the 4 rounding, and the aperture output from the strobe is controlled by the AH control magf Mg, which determines the aperture value of the photographic lens (not shown). It goes without saying.

When the photographing operation of the camera is completed in this manner, the switch SW1 is turned to N in conjunction with the rear curtain of the shutter.

Switched from C@ to N, O side, and at this time electric drive device M
Winding operation is started by D.

In this state, the output of Iv 201 #iLL[naII
) FF305 is reversed and E changes from LL to HL, and I
The output of the motor 203 also changes from LL to HL. Therefore, when the switch SWl is turned off, the transistor Tr of the power supply circuit
, is turned off and the power supply holding state is released. This will return you to the state before you started shooting.

The above is a case of single-frame photography, but when continuous photography is performed using the electric drive device MD, the release mechanisms R1 and B are kept pressed to the second stroke position, so the sw, , s kite remains on. Therefore, when the camera's photographing operation is completed and the S bird is switched from the N, O side to the N, O@ side, and the turtle becomes HL as described above, the louse becomes LLK, F F 306, #! Reverse and Ea becomes HLK&.

As a result, F F 307 is also reversed and the courtesy becomes HLK.
AND 109G (D output changes from HL to r, L nine), the counter ot-0-20 starts counting again and the display operation is performed as described above.

In this state, the power supply from the power source BAT is maintained by turning on the transistor Tr due to turning on of sw, and the output of Iv 202 becomes HL. Therefore, to complete the winding operation, when the S duck is turned on to the N and O sides, the I
The output of v 201 changes from LL to HL, and F F 3
05 is inverted and E and HL and LLK are inverted. Since this inverts E from K and HLK from LL, it is a one-shot as described above) 304 instantaneously outputs LL, and charging is completed only when the secondary capacitor for secondary light emission is completed as described above.
In other words, since the flashlight preparation completion is displayed, the present invention prevents the photographer from starting flash photography at an inappropriate time, and allows the photographer to always take appropriate photographs. .

In the above embodiment, the LgD for indicating completion of charging is provided inside the strobe, but it may also be provided inside the camera. In the above embodiment, Autos).

Although the camera is constructed as a separate body, it is not impossible to obtain the same effect as described above even if it is incorporated into the camera.

[Brief explanation of the drawing]

Fig. 1 is a circuit connection diagram of one embodiment of a strobe in a flash photography device to which the present invention is applied, and Fig. 2 (a) and (b) are arranged in a row. 4 to 6 are circuit connection diagrams of an embodiment of a single-lens reflex camera in the flash photography device. In the figure, 6... sub capacitor, 9... main capacitor, 21. 22.21A, 22A river resistance, 50
゜5OA... Comparator, 53... LED for indicating completion of charging, 200... AND gate. Patent Applicant: Canon Co., Ltd. - Time Closed - Time - Ichishi Ichi Procedural Amendment (Voluntary) February 18, 1981 Patent Application No. 201135 No. 2,
Name of the invention: Automatic dimming flash device malfunction prevention device 3, Relationship with the person making the amendment Patent applicant address: 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. Representative: Ryu Kaku Sanbu 4; To the agent: m146 3-3O-2 Shimomaruko, Ota-ku, Tokyo (
1) "Detailed explanation of the invention" column in the specification (2) Drawing 6, contents of amendment (1) 1-Optical power source 1 described in page 32, line 11 of the specification is changed to "photocurrent""1' to the output" written on the 16th line of the page is corrected to "output", and "of the input signal" written on the 19th line of the same page is corrected to "by flicker of one input signal". (2 Specification, page 67, line 12 to line 16 and line 4
i A D-DAJ written in page 3, line 16 to line 14
Correct to [ADJ. (6) In the drawings, each of Figures 1, 5, and 6 will be corrected as shown in the attached sheet.

Claims (1)

[Claims] In the malfunction prevention device i for an automatic flash device having a main capacitor for main light emission and a sub-capacitor for preliminary light-emission, the power is supplied to the charging completion display means only when charging of both the main capacitor and the sub-capacitor is completed. A malfunction prevention device for an automatic dimming flash device, characterized in that it is provided with means for generating a charging completion display signal.