JPS6061733A - Flash device - Google Patents

Abstract

PURPOSE:To prevent an incorrect exposure from being executed by sliding a frame body after a diaphragm and a dimming level is determined by the first stroke, and giving warning when an irradiating angle is set to that different in an irradiating angle characteristic in case the diaphragm is determined. CONSTITUTION:After determining a diaphragm value and a dimming level by executing the first stroke, a frame body 2 is slid, and in case a flash irradiating angle is reset, a slide contact piece 6 cuts off once contact to contact pieces 7', 7'' by a displacement from the set position of the frame body, and thereafter, the frame body 2 is shifted to the engaged position determined by a click mechanism, therefore, the switch is turned off once, and turned on again when the frame body is shifted to the clock engaged position. This device is provided with an indicator to warn into a finder in response to a prescribed voltage determined by a voltage dividing ratio of a voltage dividing circuit by turning off of the switch, therefore, after the first stroke operation, it is warned and displayed that the frame body 2 is slid. Also, in this case, a light emission diode is lighted, and in a flash device, too, it is warned and displayed that the frame body 2 is slid after the first stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an automatic adjustment device that performs a preliminary flash in conjunction with the first stroke of the shutter button of the camera, and specifies the aperture value of the camera according to the amount of reflected light, prior to flash light emission for photography. The present invention relates to an optical strobe, and particularly to a strobe of this type that has a built-in zoom function that allows the angle of illumination of a subject to be varied.

Conventionally, automatic 6Jh control type strobes perform self-lighting by receiving the amount of light reflected from the subject of the flash light emission for photography, and check whether the appropriate light amount is obtained, that is, whether it is outside the linked distance. After taking a picture, it was displayed and placed on a stand. For this reason, when the out-of-linkage distance warning is displayed, the distance between the flash and the subject must be adjusted so that it is within the linkage distance, and the same scene must be photographed again, which is a disadvantage in that it wastes film and batteries. was there. In order to eliminate this drawback, prior to the main flash for photography, a preliminary flash is performed in conjunction with the first stroke of the camera's shutter button, the reflected light is received, and the aperture p value of the camera is specified according to the amount of reflected light. In addition, there is also known a strobe that solves the above-mentioned drawbacks by displaying a notification that the specified aperture is outside the range of interlocking distances before taking a photograph. On the other hand, in recent single-lens cameras, there has been a trend toward zoom lenses, and in response to this trend, many camera strobes equipped with a variable illumination angle function, so-called zoom strobes, are now on the market. When this zoom strobe is equipped with the above-mentioned light control system that warns of out-of-linkage range before photographing with the preliminary flash and all flash photography is carried out, the following disadvantages occur. That is, in modern cameras, information is often displayed in the finder during the first stroke of the shutter button, and the photographing operation is performed by adjusting the focus while pressing the first stroke of the shutter button. Operate the camera's zoom device #X to obtain the desired screen. After that, the user operates the zoom control of the strobe to match the selected focal length of the camera's zoom lens and takes a picture.

Now, in that case, change the shutter button of the camera to double,
If the above-mentioned operation is performed while holding down the first stroke, the strobe flash will pre-flash the first time the shutter button is touched, and the specified aperture will be determined based on the reflected light at that time.

Therefore, the zoom state (flash angle state) of the strobe differs between the time of actual flash photography and the time of preliminary exposure, and there is an inconvenience that the specified aperture determined by the above operation will never provide the proper exposure. arise.

The present invention has been made in view of the above-mentioned matters, and the first step of the operation of the release operation member of the camera triggers the flash tube to emit a preliminary flash, and the light reflected from the subject due to the preliminary flash is received by the light receiving section. The light receiving section output is stored and held in a memory circuit, and the light receiving section output at the time of preliminary light emission stored in the memory circuit is transmitted to the aperture 9 control circuit of the camera by a second step operation of the release operation member of the camera. In a flash device that controls an aperture based on the output of a light receiving section and emits main light, the light receiving section is disposed in a main body, and a front illumination angle variable member that is slidable with respect to the main body is disposed in front of the flash tube. Further, a detection means for detecting the sliding of the illumination angle variable member with respect to the main body and outputting a slide signal, and an operation signal forming means for forming an operation signal in the first stage operation of the release operation member are provided. By issuing a warning using the warning means that responds to the operation signal and the slide signal, when the zoom state becomes different from that at the time of the preliminary flash after the preliminary flash, a warning is displayed and the photographer is informed. This was done to let people know.

Next, a flash device according to the present invention will be explained.

FIG. 1 is a front view showing the external appearance of a flash device according to the present invention, and FIG. 2 is a side sectional view thereof. FIG. 5 is a partial sectional view of the top surface thereof. In Figs. 1, 2, and 5, 1 is a main body, 2 is a frame that has a lens 2' for focusing light from a light emitting section (to be described later) onto a subject, and is slidable in the front and rear directions with respect to the main body 1. The illumination angle is adjusted by adjusting the sliding amount of the frame body. 3 is a main light emitting part having a main light emitting tube, 4 is a preliminary light emitting part having a sub light emitting tube,
Flash light from these light emitting units is irradiated onto the subject via the above-mentioned lens 2'.

Reference numeral 5 denotes a light receiving section provided at the bottom of the main body 1 near a portion of the shutter, and the light receiving section receives the light beam from the subject reflected by the flash.

Reference numeral 7 denotes a printed circuit board fixed to the main body, and conductor contact pieces 7, 7' are provided on the circuit board as shown in FIG. Reference numeral 6 denotes a sliding contact piece that is fixed to the frame 2 as shown in the fourth figure and slides on the contact piece on the substrate Z in conjunction with the sliding of the frame.

The frame body 2 is click-connected as shown in Fig. 5 by a click mechanism consisting of a coil spring and a click member provided on the upper part of the main body 1, and a click retainer provided on the frame body. When the hole 2-1 and the click mechanism engage, the contact piece 6 connects with the contact piece C of the printed board, and when the engagement hole 2-2 and the click mechanism engage, the contact piece 6 connects with the contact piece C of the printed board. When the contact piece 4 is connected and the click mechanism 8 is further engaged with the retaining hole 2-3, the contact piece 6 is connected to the contact piece A.

In the embodiment, the printed board may be interlocked with the frame, the contact piece 6 may be fixed to the main body, and the printed board may be slid against the contact piece 6 by sliding the frame.

6 is a circuit diagram of the flash device shown in FIG. 1. In FIG. 6, 32 is a normally open power switch connected in series to a battery 61, A known DC-DC converter 35 that boosts the voltage is connected. The converter 55 includes two rectifying diodes 54.
35 is connected to the cathode side of the diode 34, as well as the coil 12 and the main discharge tube 1 for photographing that constitutes the main light emitting section 3.
The anode of the main thyristor 18 is connected via 3.

Further, a preliminary light emitting section 4 is provided on the cathode side of the diode 65.
A parallel circuit consisting of a sub-discharge tube 37 for ranging and a sub-capacitor 36 supplying luminous energy to the discharge tube 37 is connected. A trigger circuit 38 is connected to the trigger electrode of the sub-discharge tube 37.
A monostable multivibrator 130 is connected to the input terminal of 8. A main capacitor '59 for storing luminous energy is connected in parallel to the main discharge tube 13, and a known trigger circuit 10 is connected to its trigger electrode. On the other hand, the second output terminal of the trigger circuit 10 is connected to the gate of the main thyristor 18 and the resistor 17 connected to the gate.
connected to.

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
FT is a voltage dividing circuit resistor connected in parallel to the main capacitor 39 to detect the charging voltage of the main capacitor 39, and FT is a phototransistor that receives reflected light from an object (not shown) constituting the light receiving section 5. , the phototransistor PT
A constant voltage power supply 24 and a capacitor 57 for distance measurement are connected to. Reference numeral 50 denotes a comparator connected to the output terminals of the voltage dividing circuits 21 and 22, and the negative input terminal (-) of the comparator 50 and the negative input terminal (-) of the comparator 51 receive a reference voltage from the constant voltage power supply 24. is connected to the output end of the constant voltage power supply. 53 is a light emitting diode (hereinafter referred to as LED) connected to the output terminal of the comparator 50 via a resistor 52 to indicate the completion of charging of the main capacitor 39.
, 54 is a buffer circuit connected to a connection terminal a connected to a camera side connection terminal, which will be described later, and the output terminal of this circuit 54 determines whether or not the shirt release button, which will be described later, has been pressed down to the first stroke position tit. Comparator 5 to detect
1, and its output is latched via a switch 140 constituted by contact pieces 6, 7', and 7' in Fig. 3, which is turned on when the zoom click stop position is located. Connected to the anodes of circuits 85-87.

41 and connected to terminal a via resistor 56)
transistor, the transistor 41 has a resistor 55
The emitter is connected to the output terminal of the comparator 50 through the terminal, and the emitter is connected to the negative electrode of the battery 31. An element 58 connected in series with the switching transistor 62 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 timing circuit of the photometry circuit in the flash amount control circuit. The element 60 connected in series with the second capacitor forming the second time setting circuit and the switching transistor 64 is the third capacitor forming the 50th time setting circuit of the photometry circuit for flash amount control. Discharge resistor 14
2, 143, and 144 are connected, respectively.

65, 66, and 67 are pace resistors connected to the respective bases of transistors 62, 63, and 64; 68 is a resistor connected to the base of each of the transistors 62, 63, and 64; 69 is a resistor connected to the base of transistor 68, 73, 74.75 is a dimming level,
That is, a comparator for selecting the aperture value to be used, 7
0,71.72 iResistors for supplying reference voltage connected to these comparators 75 to 75; 61 is a resistor whose resistance value is varied according to the set film sensitivity fK; 76 to 78u
AND gates 8o connected to the bases of the transistors 62-64 through resistors 65-67 in order to turn on one of the transistors 62-64 in synchronization with the generation of a light emission trigger signal to be described later. is inverter 7
9. The comparator 76 and the sub-thyristor 19 are connected to the switching transistor 68 through the resistor 69 to guide the light emission stop signal generated from the +31i comparator 73 to the gate of the sub-thyristor 19.
AND gates 82 to 84 are AND gates connected between the comparators 75 to 75 to guide the dimming level selection signals, that is, the aperture value selection signals, to the latch circuits 85 to 87. The end is a latch circuit 85
connected to the gate of the cyrisk forming the gate 83
The output terminal of gate 84 is connected to the gate of a thyristor forming latch circuit 86, and the output terminal of gate 84 is connected to the gate of a thyristor forming latch circuit 87. 85-87
are the latch circuits each formed of a thyristor, and seven nodes of the thyristor forming the latch circuit B5 are connected to the switch 140, and its cathode is connected to the base of the transistor 113 via the resistor 110. Further, the anode of the thyristor forming the latch circuit 86 is connected to the switch 1.
40, and its cathode is connected to OR gate 88, AND GO) 160. Transistor 11 through resistor 111
Connected to the base of 4. Additionally, the anode of the cyrisk forming the latch circuit 87 is connected to the switch 140;
Its cathode is connected to an OR gate 89.

90 to 96 are inverters, and 105 to 107 are LIICDs connected to AND gates 94 to 96, which display the selected dimming level, in other words, the aperture value prior to main light emission. 108 is a/toge) 1
Inverter connected to 09+j60, 110-112
is a base resistor connected to the bases of npn transistors 113 to 115, 116 to 118 are resistors for generating a voltage according to the selected aperture value, 119 is a resistor, 1
20 is a voltage dividing circuit forming resistor connected in parallel to each of the resistors 116 to 118, 121 is a buffer circuit, and 122 is a lens opening y supplied from the camera side via a terminal.
This is a comparator for determining a value signal and normally outputs a low level signal. 125 and 126 are resistors for forming a voltage dividing circuit for supplying a reference voltage to the negative input terminal of the comparator 122, 123 is an operational amplifier, and 124 is a terminal for sending an aperture value signal to the camera side and the negative input of the amplifier 123. 127 is an inverter connected to the input terminal of AND gate 152, 127 is an AND gate, and 161 is AND gate). (referred to as a one-shot circuit), 97.98 is an AND gate, and 104 is an underexposure switching signal L]iiD connected to an OR gate 99 via an 11L flow-limiting resistor 100.

A is a terminal to which a constant voltage is supplied from the camera side when the camera's release button is pressed down to the M1 stroke position, and a terminal that sends a shutter speed switching signal to the camera side when charging of the main capacitor 39 is completed, and b is a selection terminal. A terminal that transmits a voltage corresponding to the aperture value signal from the camera to the camera side, and transmits an open aperture value signal of the photographing lens used from the camera (Ill) to the processing circuit of the strobe; C is a known synchro terminal, and d is a ground terminal.

Next, the operation of the flash device according to the present invention will be explained.

- First, after attaching the flash device shown in the first figure to the hot shoe (not shown) of the camera and then closing the power switch 62,
The DC-DC converter 33 and the constant voltage power supply 24 start operating, and charging of the lifetime capacitor 39, sub-capacitor 36, etc. is started. Then, when the charging voltage level of the main capacitor 69 lags behind a predetermined value K and reverses from the output level of the comparator 50 (hereinafter referred to as LL) to the current level (hereinafter referred to as HL), J, , FfD 53
lights up to indicate that charging of the main capacitor 39 is completed, and a high level voltage is applied to the base of the transistor 41, turning the transistor 41 into a conductive state.

Next, the photographer presses the shirt release button (not shown)
When pressed down to the 1st stroke position (at this position, the shutter release or photographing lens aperture measurement operation does not start, but only the light metering circuit and display circuit in the camera start operating), the camera's hot shoe Since a constant voltage is applied to the terminal a via the transistor 41, the transistor 41 is inverted to a conductive state. As a result, a current flows from the camera through the terminal a, and in response to this flowing current, the mode of the shutter time control circuit in the camera is switched from the natural light photography mode to the flash photography mode. At the same time, the constant voltage generated at terminal a is transferred to the buffer circuit 5.
4 to the positive input terminal (+) of the comparator 51, the output level of the comparator 51 is either LL or
It is reversed from HL to HL.

At this time, if the click retaining holes (2-1 to 2-6) of the frame body 2 are engaged with the click mechanism of the main body, the contact pieces 6 and 7'
, 7N are on, so the switch 140 is on. Therefore, HL of the comparator 51 is applied to the anodes of the latch circuits 85 to 87 via the switch 140.

Furthermore, the output level of the AND gate 128 is also inverted from LL to HL.

When the output level of AND gate 128 inverts to 11 L, one-shot circuit 130 is triggered and the circuit 1
Since the trigger circuit 30 generates the HL output voltage for a preset divisor of several tens [μ壓], the trigger circuit 3 is triggered at the same time as the pulse is generated from the one-shot circuit 130, and the open capacitor 38 is output from its output end. Generates an l trigger pulse that triggers the At this time, the sub-cabinet 56 is charged to a sufficiently high voltage, so when a trigger pulse is applied from the trigger circuit 38, it opens (α waves flow from the capacitor 36 into the tube 57, and preliminary light emission begins).

On the other hand, the pulse from the one-shot circuit 160 is also applied to the AND gates 82 to 84 and the OR gate 80, so the AND gates 82 to 84 are in a standby state, and
The transistor 68 becomes non-conductive, and the distance measuring capacitor 5
7 is released, and the distance measuring side optical circuit starts operating at the same time as the start of the preliminary light emission. Incidentally, at this point, since the LL light emission trigger signal is not applied to the synchro terminal C, the transistors 62 to 64 are all kept in a non-conducting state, and the dimming capacitors 58 to 60 are all in an inactive state. .

When the light from the discharge tube 37 reflected by the subject upon the start of preliminary light emission enters the phototransistor FT, the output voltage of the ranging capacitor 57 increases with the passage of time in accordance with the photocurrent flowing through the phototransistor PT. The charging voltage of the capacitor 57 during such a distance measurement process is changed to the latch circuit 85 by reversing the output level of the one-shot circuit 130 to LL after approximately several tens of microseconds from the start of preliminary light emission.
~87 is latched as distance information.

Here, when the distance to the subject is long and the charging voltage of the capacitor 57 is low after the distance measurement time (one-shot circuit output time) has elapsed, only the comparator 75 becomes HL, and only the output level of the Siratte circuit 87 becomes HL. The output level of each of the output ends of the OR gate 89 and the AND gate 109 becomes HL, so that only the transistor 15 becomes conductive, and the resistor 118 is connected in parallel to the resistor 120. When the resistor 118 is connected in parallel to the resistor 120, the potential at the positive input terminal of the buffer circuit 121 drops according to the resistance value of the resistor 118 connected in parallel, and the potential at the non-inverting input terminal of the amplifier 123 also decreases accordingly. and descend. As a result, the above resistor 1 is required to connect to the terminal.
The voltage determined at 18 is output. Assuming that the resistance value of the resistor 118 is set to a value corresponding to, for example, P2.0, the aperture value? A voltage corresponding to 2.0 is generated.

Also, if ORGATE 89 becomes HL as mentioned above, 7y
to! -) 78,) Ranjistaro 41fi are respectively in the HL and conductive state.

Due to this, the third time setting circuit of the flash amount control circuit is brought into a selected state. Capacitor 60 of the third time constant circuit
Is the above aperture 9 value? As a result, the dimming level of the dimming circuit is set to a value corresponding to F2.0.

Furthermore, when the OR gate 89 becomes HL as described above, the output of the AND gate 128 becomes HL, and the output of the latch circuit 86 becomes L.
Since the output of the AND gate 96 is also HL, Q,
The LFiD 105 lights up to notify the photographer in advance that the aperture of the camera photographing lens and the light control level (aperture value) of the flash will be adjusted to the aforementioned aperture value of F2.0.

On the other hand, when the subject is located at an intermediate distance, the charging voltage of the capacitor 57 is charged to a higher potential than in the above case. Therefore, the output of the comparator 7'4tO'VC comparator 74 becomes HL, and the outputs of the Shiratsu circuits 86 and 87 become HL, so the outputs of the AND gates 160 and 109 become HL via 88.89, and the transistor 114, 115 force conducts and aperture value setting resistor 1
17 and 118 are connected in parallel to the resistor 120 of the voltage dividing circuit. When the resistors 117 and 118 are connected in parallel to the resistor 120, the potential at the positive input terminal of the buffer circuit 121 drops according to the resistance values of both the resistors 117 and 118 connected in parallel to the resistor 120. The potential at the non-inverting input terminal also drops in accordance with the drop.

Assuming that the potential at the non-inverting input terminal of the amplifier 123 is adjusted to F4.0 when the resistors 117 and 118 are selected, the above operation will cause the terminal to change to the camera's aperture. A voltage is generated having a value that adjusts the aperture of the photographing lens to F4.0 even smaller than the above-mentioned comparison value F2.0.

Also, if ORGATE 88.89 becomes HL as mentioned above,
77. One input terminal of each of 78 is HL.
Therefore, each of the transistors 65 and 64 becomes conductive. As a result, the third time setting circuit and the second time setting circuit described above are selected. The second. When both the sixth time constant circuits are selected, the capacities of contents -59 and -60 are set to correspond to the aperture value F4.0, so the dimming level can also be adjusted by the above operation. The aperture value is set to correspond to the selected aperture value F4.0.

Furthermore, when 88.89 is inverted to HL as described above, the output of AND gate 128 becomes HL, and latch circuit 8
Since the output of 5 is LL, only the output of gate 95 among AND gates 94 to 96 is HI, and LFiD 106
lights up to notify the photographer in advance that the aperture of the camera's photographic lens and the light control level (aperture value) of the strobe will be adjusted to the aforementioned aperture value of F4.0. When the subject is close, the charging voltage of the capacitor 57 causes the outputs of the comparators 75, 74 and 73 to become HL.
Since the outputs of all latch circuits 85 to 87 become HL,
The output of 109°160 becomes HL, and the transistors 113 to 11
5 becomes conductive and the aperture value setting resistors 116, 117, 118
are connected in parallel to the resistor 120 of the voltage divider circuit.

When resistors 116 to 11 are connected in parallel to resistor 120, the potential at the positive input terminal of buffer circuit 121 drops according to the resistance value of resistors 116 to 118 connected in parallel to resistor 120, and the non-inverting potential of amplifier 123 The potential at the input end also drops in accordance with the drop.

As a result, a voltage is generated at the terminal that adjusts the aperture of the photographing lens of the camera to a smaller aperture than the aforementioned aperture value of 74.0, that is, the aperture of the photographic lens, for example, FB, Oi.

Further, when the output of the latch circuit 85 becomes HL and the outputs of the OR gates 88 and 89 become HL as described above,
When one input terminal of each of the transistors 76, 77, and 78 becomes HL, each of the transistors 62 to 64 becomes conductive.

Therefore, in this case, M1 to third time constant circuits are selected and capacitors 58 to 6o are selected.

When all of these capacitors are selected, the capacitor capacitance is set to correspond to FB, 0, so the dimming level is set to correspond to F8.0.

Furthermore, when the output of the latch circuit 85 becomes HL, the output of the AND gate 128 becomes HL, so only the IJD 107 lights up, and the camera's photographing aperture and the light control level (aperture value) of the strobe are adjusted to the aforementioned aperture value of F8.0. inform the photographer in advance that the

As described above, by performing the first step operation, the aperture value and light control level are automatically selected in accordance with the subject distance. After this, when performing the second stroke operation,
The aperture of the camera is adjusted and the shutter is released by a voltage from the terminal according to the aperture value determined in the distance measurement process described above. As is well known in the art, the synchro switch is turned on at the shutter release, a synchro switch on signal (LL) is input from terminal C, HL is sent out from the AND gate 132, and the one-shot circuit 131
is triggered.

The output from the one-shot circuit is transmitted to the trigger circuit 10, which triggers the main discharge tube 13 to emit the main light for photographing.

On the other hand, the output of the one-shot circuit 131 is the AND gate 7
6 to 78, a predetermined AND gate outputs HL according to the aperture value determined in the above operation, and the first
- A predetermined time-setting circuit is selected among the third circuits.

Therefore, the reflected light from the subject due to the main light emission is received by the phototransistor FT, and the received light output current is charged in the capacitor 57 and the capacitor of the selected time circuit, and the charging level of these capacitors reaches a predetermined value. When reaching , the comparator 73 outputs IL, the AND gate 81 outputs HL, and the thyristor 19
When it turns on, the electric charge in the commutating capacitor 14 is discharged and the flash ends, as is known in the art.

In this way, the multiple control and flash area adjustment performed in the second stroke are performed based on the aperture p value that corresponds to the subject distance determined in the first stroke, so that proper flash photography is always possible. is executed. On the other hand, suppose that after performing the first stroke and determining the aperture value and dimming level, the frame body 2 shown in the first diagram is slid and the flash irradiation angle is reset.

In this case, the sliding contact piece 6 (
(Fig. 6) breaks contact with the -tank pieces 7/, 7#,
The frame body 2 moves to the locking position determined by the click mechanism. Therefore, the switch 140 is turned off, and the anodes of the frame 2 shown above are T and +L, and their outputs are also all I and L.) The output of 88.89 is LL,
Therefore, the AND gate 109,1 (5 gates) also outputs LL and keeps the transistors 114, 115 in the off state.

Furthermore, since the output of the latch circuit 85 is LL as described above, the transistor 113 is also turned off.

Accordingly, the multiplier 123 transmits a predetermined voltage determined by the voltage dividing ratio of the voltage dividing circuits 119 and 120 to the camera via the terminal.

The camera is equipped with a display that displays KM in the viewfinder in response to a predetermined voltage determined by the voltage division ratio of the voltage division circuits 119 and 120. Slide (+- display notice.

Also, at this time, the inverter 93 outputs the latch circuit output (LL
), the AND gate 97 also sends out the HL, and the HL is transmitted to the light emitting diode 104 via the OR gate 99. Therefore, the light emitting diode 104 lights up, and even in a flash device, a warning is displayed that the frame body 2 has slid after the first stroke.

As described above, when the frame body 2 slides after the aperture and dimming level are determined in the first stroke and the illumination angle is set to a different illumination angle characteristic from the illumination angle characteristic when the aperture was determined, this This will prevent the photographer from performing the second stroke without noticing this and resulting in improper exposure.

As described above, in the present invention, when the zoom state shifts to a state different from that at the time of the preliminary flash after the preliminary flash, this is detected and a warning is issued. It is possible to know the transition of the zoom state before photographing, and it is possible to prevent inappropriate exposure.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the external appearance of a flash device according to the present invention, FIG. 2 is a side sectional view of the flash device shown in FIG. 1, and FIG. 3 is an M2
A partial cross-sectional view from the upper side of the illustrated printed circuit board 7, No. 6
The figure is a circuit diagram showing an example of the circuit configuration of the first illustrated flash device. 140...Switch 97...AND gate 104...Light emitting diode 128...AND gate Patent applicant Canon Corporation

Claims (1)

[Claims] The first stage operation of the camera's release operating member triggers the flash tube to emit a preliminary flash, the light reflected from the subject due to the preliminary flash is received by the light receiving section, and the output of the light receiving section is stored and stored in the memory circuit. In a second stage operation of the release operating member of the camera, the output of the light receiving section at the time of preliminary light emission stored in the memory circuit is transmitted to the aperture control circuit of the camera, and the aperture is controlled based on the output of the fluorescent section. In a flash device that emits main light, the light receiving section is disposed in a main body, and a variable illumination angle member that is slidable with respect to the main body is disposed in front of the flash tube, and further, the variable illumination angle member is attached to the main body. A detection means for detecting a slide and outputting a slide signal, and an operation 1g forming means for forming an operation signal in the first stage operation of the release operation member are provided, and a warning is provided in response to the operation signal and the slide signal. A flashing device that makes it clear that the person was forced to use his/her mouth.