JPS6017428A - Flash device - Google Patents

Abstract

PURPOSE:To determine a diaphragm value in accordance with a bounce position of a light emitting part by controlling a light emitting trigger circuit by detecting a turning of the body of the light emitting part, and executing a pre-light emission again in case when the light emitting part has turned. CONSTITUTION:A brush 7 of a bounce head part 3 and comb-teeth 6A2, 6A3 contact, a switch becomes on, and a diaphragm value for flash is determined by a light emission of a pre-light emitting part. When the head part 3 turns by a prescribed quantity after the pre-light emission, the brush 7 and the comb-teeth 6A2, 6A3 become a non-contact state, the switch becomes off, and it is detected that the head part has turned. When the head part 3 is further turned to a click position of the lower part by 10 deg. from the horizontal position, the brush 7 and the comb-teeth 6A2, 6A3 contact again, the switch is turned on, the prelight emission is executed again through a trigger circuit, and a diaphragm value corresponding to a bounce position is determined automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flashlight emitting device for a camera, and more particularly to a dimmable flashlight emitting device having the function of pre-emission and automatically setting an appropriate aperture value using the reflected light.

In the above-mentioned type of flash device, since the appropriate aperture value is set in the pre-flash before flash photography, accurate exposure control can be performed at all times, especially when the light emitting section is aimed at the subject. When performing so-called bounce photography by rotating the light receiving section up and down or left and right with respect to the light receiving section for light adjustment, it is convenient because the interlocking range can be confirmed by pre-emission.

However, even when performing balanise photography using the above type of flash device, if the light emitting unit rotates after the aperture is determined in the pre-flash, the determined aperture value will no longer be the appropriate aperture value. If the photographer does not notice the rotation of the light emitting section after the pre-flash and continues to take a flash photograph, this will result in improper exposure.

The present invention has been made in view of this point, and includes a detection means for detecting the rotation of the light emitting section with respect to the main body, and the detection means is connected to a trigger circuit for pre-flash, so that the light emitting section rotates after the pre-flash. Provided is a flash device that allows the trigger circuit to be restarted if the object moves, and in the above case, performs the pre-flash again and always determines the aperture value according to the bounce position of the light emitting part. It is something to do.

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

FIG. 1 shows an embodiment of a flash device according to the present invention, which is provided with a position that faces the same direction as the photographing lens when the main body is attached to a camera. 3 is the bounce head section, which is attached to the main body 1 above.
It is arranged so that it can rotate vertically and horizontally. 4 is a main light emitting section, and 5 is a pre-light emitting section, and these light emitting sections are provided in the head section.

FIG. 2(a) is a side cross-sectional view showing the vertical bounce state of the embodiment in FIG. 1, and FIG. 2(b) is a side cross-sectional view showing the main part. In FIG. 2, reference numeral 6 denotes a printed board which is fixed to a member integral with the side case of the main body 1 and has a comb-tooth electrode pattern, a turn 6A, and a donut-shaped electrode pattern 6B serving as a common terminal.

7 is coupled to the bounce head section 3 and rotates integrally with the rotation of the head section 3 to form the pattern section 6A.

Fork-shaped brush contact piece (movable contact piece) that slides on 6B
Together with the electrode pattern of the printed board 6, this constitutes a switch 140a, which will be described later. Further, two-dot chain lines 3' and 7' indicate the state of the head section and the brush when the bounce head section is bouncing upward.

The <L tooth 6A1 of the electrode pattern in FIG. 2(b) is connected to the brush 7 when the head portion 3 is set at the horizontal position (normal photographing position) shown by the solid line in FIG. 2(a). The comb teeth 6A2 and 6A3 are arranged at positions where they connect with the brush when the head portion is rotated upward by 45° and 60° from the horizontal position, respectively. Also comb teeth 6
A4 is disposed at a position where it connects with the brush when the head portion is rotated 10° downward from the horizontal position.

The head portion 3 is of various types that are click-locked at the above-mentioned comb tooth positions.

FIG. 3 (3) is a configuration diagram showing a state in which the head portion of the flash device shown in FIG. 1 is in a horizontal horizontal bounce state;
FIG. 3(b) is a drawing showing the main part of FIG. 3(a).

Reference numeral 8 denotes a printed board having a comb-like electrode pattern 8A provided on the main body 1 and fixed in the joining direction of the main body 1 and the head portion, and a donut-like electrode pattern 8B serving as a common terminal;
The pattern parts 8A, 8 are connected to the bounce head part 3 and integrally rotated in conjunction with the horizontal rotation of the head.
A fork-shaped brush contact piece (movable contact piece) that slides on B constitutes a switch 140B, which will be described later, together with the printed board 8.

In FIG. 3(b), the head portion 3 of the lower comb tooth 8A1 is the third
It is arranged so as to be connected to the brush when it is in a front position (normal photographing position) facing the subject shown by the solid line in FIG. 2(a). Comb teeth 8A2゜8A3, 8A4, 8A
5 respectively move the head part 3 to the left from the front position 3
0°, 45°, 55°.

It is placed at the position where it connects with the brush when rotated 65',
Also, the comb teeth 8A6, 8A7.8A8, 8A9 are the head part 3.
30' and 45° to the right from the front position, respectively.
It is arranged at a position where it connects with the brush when rotated by 55° or 65°. The head portion 3 is locked with a chryso JC at each of the comb tooth positions.

FIG. 4 is a circuit connection diagram of an auto strobe in a flash photography device 1t to which the present invention is applied, and 22 is a normally open power switch connected in series to the battery 21;
The known method for boosting the low voltage of the battery 21 is I) C-D.
C converter 23 is connected. Two rectifying diodes 24 and 25 are connected to the converter 23 fL, and the anode of a king thyristor 38 is connected to the cathode side of the diodes 24 via a coil 32 and a main discharge tube 33 for photographing. Further, connected to the cathode side of the diode 25 is a parallel circuit consisting of an auxiliary flash discharge tube 27 for distance measurement and an auxiliary capacitor 26 for supplying luminous energy to the flash discharge tube 27. A trigger circuit 28 is connected to the trigger electrode of the sub-discharge tube 27, and a monostable multivibrator 130 is connected to the input end of the trigger circuit 28. A main capacitor 29 for storing luminous energy is connected in parallel to the main discharge tube 3, and a known trigger circuit 30 is connected to its trigger electrode. On the other hand, the second output terminal of the trigger circuit 30 is connected to the main thyristor 38.
and a resistor 37 connected to the gate.

35 and 36 are resistors forming a charging path for the commutating capacitor 34, and among these resistors, the resistor 35 is also connected to the anode of the sub-thyristor 39 for interrupting the main thyristor. 40 is a resistor connected to the gate of the sub-thyristor 39, 41.42
43 is a resistor for a voltage dividing circuit connected in parallel to the main capacitor 29 in order to detect the charging voltage of the main capacitor 29, and 43 is a resistor for receiving reflected light from a subject (not shown); A constant voltage power supply 44 and a distance measuring capacitor 57 are connected to the transistor 43 . 50 is a comparator connected to the output terminals of the voltage dividing circuits 41 and 42, and the negative input terminal (-) of the comparator 50
The negative input terminal of the comparator 51 is connected to the output terminal of the constant voltage power supply 44 in order to receive the reference voltage from the constant voltage power supply 44 . 53 is connected to the output terminal of the comparator 50 via a resistor 52 in order to indicate the completion of charging of the main capacitor 29.
54 is a buffer circuit connected to a connection terminal a connected to a camera side connection terminal described later, and the output terminal of the circuit 54 is connected to a shirt release button described later. The positive input terminal of the comparator 51 (
+).

The output is a switch 140a that is turned on when it is in the up and down bounce click stop position.

It is connected to the input terminal of the AND gate 128 via a switch 140b which is turned on when the left and right bounce click stop positions are located, and is also connected to the anodes of the latch circuits 85 to 87.

45 is an npn transistor connected to terminal a via a resistor 56, and the base of the transistor 45 is connected to the resistor 55.
It is connected to the output end of the comparator 50 via the emitter, and the switched emitter is connected to the negative electrode of the battery 21. 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 an element 60 connected in series with the switching transistor 64 are a third capacitor forming a third time setting circuit of the photometry circuit for flash amount control, and these capacitances 58 to 60 is the discharge resistor 1
42, 143, and 144 are connected to each other.

65, 66, and 67 are base resistors connected to one base of each of the transistors 62, 63, and 64, and 68 is a base resistor connected to one base of each of the transistors 62, 63, and 64; 69 is a resistor connected to the base of transistor 68; 73, 74, 75 are comparators for selecting the dimming level, i.e. the aperture value to be used;
70, 71, and 72 are reference voltage supply resistors connected to these comparators 73 to 75, 6D is a resistor whose resistance value is varied according to the set film sensitivity, and 76 to 78 are light emission trigger signal resistors that will be described later. An AND gate 80 is connected to the base of each of the transistors 62 to 64 via a resistor 65 to 67 in order to turn on any one of the transistors 62 to 64 in synchronization with the generation of the signal.
9. An OR gate connected to the base of the switching transistor 68 via a resistor 69; 81 is a gate connected to the comparator 73 and the sub-thyristor 3 in order to guide the light emission stop signal generated from the comparator 73 to the gate of the sub-thyristor 39;
9 and 82 to 84 are dimming level selection signals generated from comparators 73 to 75;
That is, it is an AND gate for guiding the aperture value selection signal to the latch circuits 85 to 87, and the output terminal of the gate 82 is connected to the latch circuit 8.
5 and connected to the gate of the thyristor forming gate 8.
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 latch circuit 87.
It connects to the gate of the thyristor forming the thyristor. 85~
87 are the latch circuits each formed of a thyristor;
The anode of the thyristor forming the latch circuit 85 is connected to the switches 140a, 140b, its cathode is connected to the base of the transistor 113 via the resistor 110, and the anode of the thyristor forming the latch circuit 86 is connected to the switch 140a.

140b, whose cathode is connected to the OR gate 88
, an AND gate 160, and a resistor 111 to the base of the transistor 1140. Furthermore, the anode of the thyristor forming the latch circuit 87 is connected to the switch 140a, 1.
40b, and its cathode is connected to OR gate 89.

Reference numerals 90 to 93 are inverters, and 105 to 107 are LEDs connected to AND gates 94 to 96, which display the selected light control repenope, in other words, the aperture value υ prior to the main light emission.

108 is an inverter connected to AND gate 109, 160, 110 to 112 are npn) transistors 113
base resistor connected to the base of ~115, 116~1
18 is a resistor for generating a voltage according to the selected aperture value, 119 is a resistor, and 120 is the resistor 116 to 118.
, 121 is a buffer circuit, 122 is a comparator for determining the open F-number signal of the lens supplied from the camera side via the terminal, 125 and 126 are comparators. Resistor 1 for forming a voltage divider circuit for supplying a reference voltage to the negative input terminal of 122
23 is an operational amplifier, 124 is a resistor connected to a terminal for sending an aperture value signal to the camera side and the negative input terminal of the amplifier 123, and 127 is connected to a synchro terminal C for a light emission trigger signal and an input terminal of an AND gate 132. 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 AND gate, and 104 is connected to the OR gate 99 via a current limiting resistor 100. 1) A connected LED for warning of insufficient exposure; a is a shutter time switching signal when a constant voltage is supplied from the camera side when the camera's release button is pressed down to the first stroke position, and when charging of the main capacitor 29 is completed; The terminal b transmits the voltage corresponding to the selected aperture value signal from the strobe to the camera side, and also transmits the open aperture value signal of the photographing lens used from the camera side to the strobe processing circuit. C is a known synchro terminal, and d is a ground terminal. In the following explanation, the photographing lens attached to the camera is a bright lens, and comparator 1
The output of 22 is LL, and the output of AND gate 98 is also low.
It is assumed that the output of the inverter 108 is HL.

First, when the auto strobe shown in the fourth figure is attached to the hot shoe (not shown) of the camera and the power switch 22 is closed, the DC-I)C converter 23 and the constant voltage power supply 44 start operating, and the main capacitor 29 , charging of the auxiliary capacitor 26, etc. is started. When the charging level of the main capacitor 29 reaches the F9 constant value and the output level of the comparator 50 is reversed from a low level (hereinafter referred to as LL) to a high level (hereinafter referred to as HL),
The LED 53 lights up to indicate that charging of the main capacitor 29 is completed, and a high level voltage is applied to the base of the transistor 45, turning the transistor 45 into a conductive state.

Next, the photographer presses the shirt release button (not shown) to the first stroke position (at this position, the shutter release or the aperture adjustment of the photographic lens does not start, but the light metering circuit and display circuit in the camera are simply activated). When the camera is pressed down to the point where the shutter speed control circuit starts, a constant voltage is applied to terminal a through the hot shoe of the camera. In response to turning on, the mode is switched from natural light photography mode to flash photography mode. At the same time, the constant voltage generated at terminal a is also applied to the positive input terminal (G) of the comparator 51 via the buffer circuit 54, so the output level of the comparator 51 is L.
Flip from L to HL. Assuming that the head part shown in Fig. 1 is now located in the normal photographing position relative to the main body or in the bounce position where it is locked by clicking (the contact position of the comb teeth and brush in Figs. 2 and 3), the switch 140a , 140b are turned on, and the HL from the comparator 51 is transmitted to one input terminal of the AND gate 128. Also, since the comparator 50 also outputs HL, the AND gate 128
The output of is also inverted from LL to HL. Furthermore, at this time, the output HL of the comparator 51 is connected to the switches 140a, 1.
40b to the anodes of latch circuits 85-87. When the output level of the AND gate 128 is inverted to HL, the one-shot circuit 130 is triggered and the circuit 130 generates an output voltage of ■■L for a preset period of several tens [μS], so the trigger circuit 28 L- is triggered at the same time that a pulse is generated from the one-shot circuit 130, and triggers the sub-discharge tube 28 from its output terminal.
Generates IJ Gar pulse. At this time, the sub capacitor 26 is charged with a sufficiently high voltage 1, so the trigger circuit 2
When a trigger pulse is applied from 8, a current flows from the capacitor 26 to the auxiliary discharge tube 27, and preliminary light emission is started.

On the other hand, the pulse from the one-shot circuit 130 is also applied to the AND gates 82 to 84 and the OR gate 80, so the AND gates 82 to 84 enter a standby state, the transistor 68 becomes non-conductive, and the distance measuring capacitor 57 The short circuit is released, and the distance measuring photometry circuit starts operating simultaneously with the start of the preliminary light emission. Incidentally, at this point, since the light emission trigger signal of the synchro terminal cIcLL is not applied, the transistors 62 to 64 maintain a non-conducting state, and the dimming capacitors 58 to 60 are all in an inactive state. It is in.

When the light from the discharge tube 27 reflected by the object upon the start of preliminary light emission enters the phototransistor 43, the output voltage of the ranging capacitor 57 increases with the passage of time in accordance with the photocurrent flowing through the phototransistor 43. The charging voltage of the capacitor 57 during this distance measurement process is changed to the latch circuits 85 to 85 by the output level of the one-shot circuit 130 being inverted to LL after approximately several tens [μS] from the start of preliminary light emission.
87 as distance information.

Here, if only the comparator 75 becomes HL due to the charging voltage of the capacitor 57, only the output level of the latch circuit 87 becomes HL, so the output levels of the respective output terminals of the OR gate 89 and the AND gate 109 become HL. Only transistor 115 is conductive, connecting resistor 118 in parallel with 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.
The potential at the non-inverting input terminal of amplifier 123 also drops accordingly.

As a result, a voltage corresponding to the resistance value of the resistor 118 is generated at the terminal bK. For example, if the resistor bK is set to a value corresponding to the aperture value F'2.0, the voltage at the terminal bK corresponds to the aperture value F'2.0. occurs.

Further, when the OR gate 89 becomes HL as described above, the AND gate 78 and the transistor 64 become in a state where they can become HL and conductive, respectively.

In other words, the third time-setting circuit corresponding to the aperture value F2,0 is selected among the time-setting circuits of the flash amount control circuit of the auto strobe.

Furthermore, when the OR gate 89 becomes HL as described above, the output of the comparator 51 becomes T(L), and the output of the latch circuit 86 becomes LL.Therefore, the output of the AND gate 96 also becomes fi L, and the LED 105 lights up. The photographer is informed in advance that the aperture of the photographing lens of the camera and the light control level (aperture value) of the strobe will be adjusted to the aforementioned aperture value of F2.0.

On the other hand, when the outputs of the comparators 75 and 74 become HL due to the charging voltage of the capacitor 57, the output of the latch circuit 86.87 becomes HL.
The output of 09 becomes HL, and the transistors 114 and 115
conducts, and the aperture value setting resistors 117 and 118 are connected in parallel to the resistor 120 of the voltage dividing circuit. Resistor 117, its
is connected in parallel to the resistor 120, the buffer circuit 121
The potential at the positive input terminal of the amplifier 123 drops according to the resistance value of both resistors 117 and 118 connected in parallel to the resistor 120 (for example, the resistance value corresponding to F4.0), and the potential at the non-inverting input terminal of the amplifier 123 also decreases. It descends as it descends.

As a result, a voltage is generated at the terminal of such a value that the photographing aperture of the camera is adjusted further from the aperture value F2.0 to, for example, F4.0.

Also, when 88.89 becomes HL as mentioned above, one input terminal of each AND gate 77.78 becomes i(
The voltage becomes L, and each of the transistors 63 and 64 becomes conductive.

In other words, the above-mentioned aperture value F4 in the auto strobe time constant circuit
．． The second corresponding to 0. The third time constant circuit is selected.

Furthermore, when the OR gates 88 and 89 are inverted to HL as described above, the output of the comparator 51 becomes HL, and the latch circuit 85
Since the output of is LL, only the output of gate 95 of AND gates 94 to 96 becomes ML, and the LED 106 lights up, and the aperture of the camera's photographing lens and the light control level (aperture value) of the strobe become the aperture value mentioned above. The photographer is informed in advance that the adjustment will be made to F4.0. Furthermore, when the respective outputs of the comparators 75, 74 and 73 become HL due to the charging voltage of the capacitor 57, all the latch circuits 85 to 8
Since the output of 7 becomes HL, OR gate 88.89i
The output of 109.160 (1+2 and 109.160) becomes HL, transistors 113 to 115 become conductive, and aperture value setting resistors 116 and 117.118 are connected in parallel to resistor 120 of the voltage dividing circuit. is resistance 1
20, the potential at the positive input terminal of the buffer circuit 121 is the same as that of the resistors 116 to 11 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, the terminal is connected to the camera. The aperture 9 of the photographic lens is set to a smaller aperture than the above-mentioned aperture value F4.0, that is, the aperture of the photographic lens is set to the above-mentioned F8.0. A voltage that adjusts to O is generated.

Furthermore, when the output of the latch circuit 85 becomes HL and the outputs of the ORG) 88.89 become HL as described above, one input terminal of each of the ANDGOO) 76.77°78 becomes HL, and the transistors 62 to 89 become HL. 64 are in a state where they can become conductive. That is, the first to third time-setting circuits corresponding to the above-mentioned aperture value F8.0 are selected from among the time-setting circuits of the auto strobe.

Furthermore, when the output of the latch circuit 85 becomes HL, the output of the comparator 51 becomes HL, so only the LED 107 lights up, and the camera's photographing aperture and flash light control level (aperture value) are adjusted to the aforementioned aperture value of F8.0. Inform the photographer in advance that this will be done.

Here, if the subject is further away and none of the comparators 73 to 75 are inverted to HL even after a period of approximately several tens [μs] determined by the output of the one-shot circuit 130 has elapsed, the transistor 113 is turned into a latch circuit. 85 output is L
It maintains a non-conducting state due to L. Also, at this time, the output of the AND gate 160.109 is the latch circuit 86°87
The output of is LL because of LL. Therefore, when the subject is as described above, all of the transistors 113 to 115 that determine the aperture value of the photographic lens (not shown) maintain a non-conducting state, and the amplifier 123 operates at the voltage dividing ratio of the voltage dividing circuit 119 and 120. A voltage corresponding to the determined aperture value, for example, Fl, 0 is transmitted to the aperture control circuit on the camera side via the terminal. Also, at this time, as mentioned above, the output of the latch circuit 87 is LL, and the output of the AND gate 97 is HL, so LED1
04 is lit to notify the photographer that underexposed flash photography will be executed. Furthermore, when the subject is in the above-mentioned situation, OAG ~) 88, 89 and latch circuit 8
76.77.
78 also outputs LL, and transistors 62, 63.
64 is off. Therefore, the capacitor capacity of the integrating circuit is determined only by the capacitor 57, and
Since the capacitance of the capacitor 57 is set to a value that corresponds to the normally used wide-open F mode, the light control conditions are also set to a value that corresponds to the aperture value at the time of flash photography.

After performing the preliminary flash as described above and confirming that the preliminary flash has been performed, that is, that the operation for setting the spotlight level of the photographing lens and strobe has been performed, there is no problem such as performing the second stroke operation of the release. The release mechanism of the camera shown in the figure is activated (7, the aperture is adjusted to an appropriate value for flash based on the aperture signal from the above terminal, the shutter front curtain starts traveling, and exposure begins. When the curtain runs, the synchro switch turns on, and a synchro signal is input to the flash device via terminal C, and the inverter 127
The synchro signal is passed through the AND gate 132 as HL.
The AND gate 132 outputs HL.

Therefore, the one-shot circuit 131 is activated, and a pulse from the one-shot circuit is transmitted to the trigger circuit 30, turning on the p-thyristor 38 and causing a flash.

The tube 33 is flash-activated, and the main discharge tube emits main light. Further, the pulse from the one-shot circuit is transmitted to the base of the transistor 68 via the OR gate 80 and the inverter 79f, turning off the transistor 68,
The time constant circuit selected in the preliminary light emission integrates the amount of light reflected from the subject during the main light emission, and when the integrated amount reaches a predetermined value, the comparator 73 sends out HL, and the HL is Thyristor 39 through gate 81
, the thyristor 39 is turned on, and the flash light emission is stopped using a known method. The shutter time is also controlled by a camera circuit (not shown) to be the flash time, and after the flash time the shutter trailing curtain runs to complete the flash exposure.

As described above, the flash aperture and light control circuit light control conditions are selected for the flash flash, and the flash photography is executed using the selected aperture. If you turn the head part 3 without noticing the rotation of the head part and then perform the second stroke operation without noticing the rotation, the aperture value and light control conditions selected in the above pre-flash will be different from the rotation of the head part 3. After the movement, the appropriate aperture value and light control conditions no longer match, and it is no longer possible to obtain an appropriate flash exposure.

For this reason, in the present invention, after the flash is emitted, it is detected whether the head section has rotated or not, and if the head has rotated after the flash is emitted, a warning is given and the photographer is informed of this. It seems to be tightening. That is, when the head section 3 rotates by a predetermined amount after the flash is emitted, the brush and comb teeth shown in the second and third diagrams -
It becomes a non-contact state. Therefore, switch 140a
, 140b is in the off state, the anonide of the latch circuit becomes LL, and the latch circuit k'4V'7 forms the N
The lister transitions off, which causes latch circuit 85
87 cancels the latched state in the pre-light emission as described above, and the contents of all latch circuits are forcibly set to LL. Therefore, as described above, the LED 104 lights up to inform the photographer that the head section has rotated.

After that, when the head part 3 is rotated to the click position, the comb teeth and the brush come into contact again, and the switches 140a and 140b
is turned on, so the AND gate 128 again inverts the output from LL to HLK, and the one-shot circuit i3
0 is triggered again. Therefore, when the pre-flash 6i6 operation is executed again as described above, the information corresponding to the reset bounce position of the head section is latched in the latch circuits 85 to 87, and then the second stroke operation of the release is performed. The aperture is automatically adjusted to the aperture and value based on the information latched in the latch circuit as described above, and the light amount of the main light emission is controlled in accordance with the adjusted aperture.

As described above, in the present invention, when the head section rotates after the flash is flashed, this is detected and the photographer is notified that the head section has rotated, and the camera automatically resets the head section. Since the pre-flash is configured to perform a pre-flash, even if the head section rotates after the pre-flash when performing bounce photography using a flash device that changes the aperture value during the pre-flash, there will be no re-flash. Correct flash exposure control can be achieved by emitting light.

In addition, in the embodiment, the switch 140a.

In addition to directly detecting the rotation of the head section, the LED for improper exposure notification is also used in Furukawa when the head section is rotated, but an LED and a buzzer dedicated to indicating the rotation of the head section are provided. , the LEDs and buzzers are connected to the switches 140a and 140.
b, and the LED or buzzer may be driven when the switches 140a and 140b are turned off.

Of course, the above-mentioned display LED may be provided in the viewfinder of the camera and displayed within the viewfinder.

Further, in the embodiment, the pattern portion is fixed and the brush is moved in conjunction with the rotation of the head portion, but the brush may be fixed in the passage and the pattern portion is moved in conjunction with the rotation of the head portion.

Furthermore, the width of the comb teeth in FIGS. 2(b) and 3(b) is set wider.1. A predetermined position (for example, 5
switch 140a.

b is not turned off, and even if the above-mentioned anti-flashing or pre-flash cannot be performed for rotations within a range where the effect on flash control due to rotation of the head is negligible. good.

[Brief explanation of the drawing]

FIG. 1 is an external view showing the external appearance of the flash device according to the present invention, FIG. 2 (a) is a configuration diagram showing the vertical bounce state of the flash device shown in FIG. FIG. 3(a) is a circuit diagram showing the configuration of the flash device shown in FIG. 1 in a left-right bounce state. DESCRIPTION OF SYMBOLS 1... Main body, 3... Head part, 6.8... Printed pattern board, 140a, 140b° Switch patent applicant Canon Corporation

Claims (1)

[Claims] A main body having a light receiving section that receives pre-flash before shooting and main flash for shooting, and a flash tube for emitting the light,
a head section rotatably disposed relative to the main body; a designation circuit for specifying a flash aperture υ value based on a photometric output from pre-flash received by the light receiving section; The light adjustment circuit adjusts the amount of flash according to the photometric output of the main flash received by the main flash, and the aperture value for flash is specified by pre-flash before shooting, and the head is connected between the main body and the head. A detecting means for detecting the rotation of the head is provided, and the detecting means is connected to a trigger circuit for causing pre-flash, and when the head rotates by more than a predetermined amount after the pre-flash, the detecting means detects the trigger circuit. A flash device characterized in that it allows restarting.