JPS5821720A - Automatic dimming and flashing device - Google Patents

Abstract

PURPOSE:To obtain a flashing device enabled to flash continuously in case of detecting a motor driven device is fitted to a camera. CONSTITUTION:A signal for turning on/off having a synchronous contact Sx built in a camera is supplied to an input terminal (g) of a control circuit 3. A signal for turning on/off a MD turning switch S2 is supplied to an input terminal (h) of the control circuit 3. The switch S2 is turned on when a motor driven device is attached to the camera to attain continuous photographing. The control circuit 3 emits trigger pulses to output terminals (c), (d) synchronously with the turning on of the synchronous contact Sx. When the switch S2 is on, the control circuit 3 outputs the 1st pulse after passing a prescribed time from the turning on of the synchronous contact Sx. Said prescribed time is varied in proprotion to the frame speed of the motor driven device. In addition, the control circuit 3 outputs photometric pulses to a terminal 1 during a prescribed period corresponding to the maximum flashing time of a speed light synchronously with the turning on of the synchronous contact Sx.

Description

[Detailed description of the invention] The present invention relates to a flashlight emitting device.

When using a series-controlled automatic dimming speedlight, the speedlight can re-flash for a short period of time when the amount of light emitted is relatively small, making it possible to emit continuous flashes at a rate of several frames per second. It can emit light in conjunction with a camera equipped with a drive device.

When performing continuous photographing using such continuous flash emission, a problem arises as to whether or not a motor drive device is attached to the camera.

Therefore, an object of the present invention is to provide a flash light emitting unit that can emit 1 or 2 consecutive flashes when it detects that the camera 1: motor drive device is attached.

,/ / / /′ /′ /′ The present invention will be explained below based on examples.

FIG. M1 is a block diagram showing an embodiment of the present invention. When the power switch 81 is on, the DC/DCC/formula 1 boosts the voltage of the power supply E and connects it to the high voltage power supply line V, -GND.
Supply to Seki. Further, the voltage of the low voltage voltage #E is supplied between the power supply v8° and 〇ND. Main capacitor CM is DC
/DCC/The output voltage of the formula-ta 1 is stored as energy for flashlight emission.

The on/off signal of the synchro contact Sx internally connected to the camera 2 is applied to the input terminal g of the control circuit 30. The on/off signal of the M1wl tone switch S- is applied to the input gate hK of the 1111 circuit 3. The switch sl is turned on at 11 when the motor drive device is attached to the camera and continuous shooting is performed.For example, the switch sl is turned on at 11 when the motor drive device is attached to the camera and continuous shooting is performed. It is turned on by a disposed operating member (not shown).

In the case of wave cloth, the switch 8 itself is provided in the camera body or motor drive device, and is electrically connected to the speedlight side. The control circuit 3 outputs the output terminal* and the die trigger pulse a1g in synchronization with the turning on of the synchro contact 8x.
-1%81g-2. In addition, when the control circuit 31 S switch S is on, the lth control pulse -1g is applied for a certain period of time τ1 after the synchro paddle point Sx is turned on.
- generates s. This fixed time is variable depending on the speed of the motor drive device. Historically, the control circuit 3 synchronizes with the ON of the synchronizer 48x and outputs a photometry pulse of -1g for a certain period of time fl corresponding to the maximum light emission time of the speedlight.
-4 is generated at terminal t.

The resistor R1% capacitor C1, the transformer L and the first thyristor TI constitute a trigger circuit for the flash discharge tube FT. #
12 Thyristor T, discharge tube FT and main capacitor C
Opens and closes the main discharge loop with M. The commutating capacitor CI is 9 [
-3 thyristor Tl is converted capacitor Cmtl
Opens and closes the commutation loop for connecting the A2 thyristor T to a reverse bias state. The photodiode DP and the capacitor CS constitute a light amount integrating circuit. The transistor Tr1 is turned on while the -J light pulse sth -4 is applied from the control circuit 3, and charges the capacitor cl to the LoE function. Comparator cP has a reference voltage determined by resistor R1 and Zener diode Dsl, and capacitor CS
When the photovoltaic voltage of is in the errand state, a control pulse s1g-5 of @42 is generated. Bottom line 3 thyristor T1 is OR
When a 1% or 20th control pulse is applied through the gate Gl, it turns on and closes the commutation loop.

The detection circuit 5 detects the photoelectric voltage of the main capacitor cII,
The possible number of times the flash generator can be generated is determined and outputted to a number of pulses t-receiver a corresponding to the number of times.

Resistor R and capacitor C4 form a circuit for several minutes and connect to connection point 1.
Generates heavy output. The display selection switch Ss is connected in parallel with the capacitor C4, and is turned off in the flash light output mode and turned on prior to flash photography. The latch circuit consisting of NAND gates G, , G, is synchro contact 8! The on/off signals of the connection point PR and the output signal of the connection point PR are input. Resistance FK R
v, the differentiator circuit consisting of capacitor Cl%C- is NAN
D game) The Q output of Gs and the Q output of NAND gate G are used as thermal power, and a connection point pm<output signal is generated.

The AND gate G4 inputs the output of the detection circuit 5 OIIA+a and the Q output of the NAND gate Gs. AND
Output of terminal f of gate G 11 tl J 11 circuit 3 (
slg-4) and the Q' output input of the NAND gate G1. The Q output of the NAND gate G is applied to the terminal bK of the horizontal output circuit 5, and when the Q output is @H#, an output is prevented from being generated at the terminal a of the detection circuit 5. Connection point Pl
The output of is applied to the reset terminal RK of the shift register 8H via an OR gate G. When the switch S4 is on, the shift register SR operates on the output of the connection point P3, and when the switch 84 is off, the shift register SR is reset.

The output of OR gate G, which receives the output of AND gate G'4 and the output of AND gate G-, is sent to shift register S.
applied to the clock input terminal of R. AND gate G4
The output of the OR gate Ga, which receives the output of the comparator CP and the output of the comparator CP, is applied to the data input terminal DK of the shift register SR. The left register SR outputs 1L1 to the output terminals Q1 to Qn according to the count value. Each of the light emitting diodes D1 to Dn lights up when the corresponding output is 1L.The relay circuit 4 connects the output of the shift register SR to the camera body 1t7J.
The signal is transmitted to source diodes p/1 to 0'3.

% charged diode D breath and D' breath e Dl and D' father...D
n and D'n are lit at the same time. Light emitting diode L)1~
Dn; D'1 to Dn' may be placed on the speedlight side and/or the camera @ as necessary.

Next, take a look at the action.

(1) Operation when using the motor drive device 1': In a scene where flash photography is performed continuously using the motor drive device, the four-subject condition is considered to be constant. Therefore, while keeping the % subject distance and aperture value constant, the speedlight's light emitted by 1k (i.e., light emitting time) is limited to a predetermined value GNLK, and the correspondence between the arm speed of the motor drive device and the light emitting time is expressed as follows. If you do this, several consecutive flashbacks will become an orbe.In other words,
Arm speed represents the number of emotions per unit time, so if you make a plan to finish emitting light with the value GN& at the peak of the firing point for each shot, the number of temporary shots may be limited. The shooting of the pillow flash became the Noh performance. Specifically, by turning on the switch S=↓, turn on the synchro contact 8X, and then turn on the lth
The time τ1 until the Sth pulse S-3 is generated is made to correspond to the arm speed.゛Now, when you turn on the power switch S1, D C/D
In the C converter 1, the main capacitor C5, capacitors cl and cl are connected to the photovoltaic start gate. It is assumed that the switch s4 is about to be turned on at this time. At the same time, since Kmm point 1 outputs @L" when the power is turned on (switch S8 is off at this time), the Q output of NAND gate G- becomes "H", and the Q output of NAND gate G- becomes @L".
Therefore, the connection point Pl becomes m-“H” and the contents of the shift register 8R are reset. On the other hand, since the Q output of the NAND gate Gs is @L', the detection circuit 5 generates a pulse at the @Hm level at the terminal aK from the photoelectric voltage of the main capacitor CM, corresponding to the number of times the flash can be emitted. Since the Q output of NAND gate G is @H#, the pulse output from terminal a is output through AND gate Ga t-.
R gate Ga % GW K transmitted. Here, it is assumed that the shift register SR is to sequentially insert the Kameko Do input when the terminal CK is 1 to 4". Then, the input terminals CK and DK of the shift register SR are each connected to the OR gate 01. , Gs', the pulses from the leper field are simultaneously applied, so the shift register 8R is connected to the terminal a.
The output pulses at- will be counted. Therefore, the count value corresponds to the number of times that flash light can be emitted. Then, when the number of times the Sengen Yakosha function is 1, the terminal Q1't@L' is
When twice, K is connected to terminal Qt*Qs@Lm, ...WA
At the time of flashing, the one-element diode DI%D is also lit, and the number of lit light-emitting diodes indicates the number of times that flash light can be emitted. This number of times is passed through the 9-viscous circuit 4 (.

With the camera body 2, the ship will be displayed in the viewfinder, for example.

And -1, I would like to express my gratitude for the calculation of the possible number of flashes.

When the main capacitor Ckl is cut off from the photoelectric pressurization chamber, it is set to v, when the first light is emitted, it is vl, when the second I8J1 is fired, it is Vlm... after the second light emission, it is set to vl, and 11
If the energy required for the 1J era F9T foot launcher GNA is α, then the following relationship holds true. That is.

The energy for the first light emission* is 121g, the first KI! Since the energy applied to the first flash is expressed as h-v (however, CM is the main capacitor Sumire Tani), the main capacitor CMVB voltage at 9 o'clock in the nth flash is , can be expressed as .

From this, the flashing light-I-circulation N can be calculated as. N pulses obtained from this calculation result are output from terminal a.

After confirming the possible number of flashes from the number of light-emitting diodes D, -'-D,, D' to D,' lit, the photographer operates the camera's release (this means that this light-emitting diode is lit). (also indicates that the main capacitor has been photovolted to the voltage that allows light emission), then the synchro contact 8x turns on, so the NAND gates G and Q
It outputs 1H# to its output, and the NAND gate Gl outputs @L# to its i output. Therefore, the connection point PI has one i
11@H' pulse is generated to reset the contents of shift register SR. Further, the AND gate G4 is closed, and the detection circuit 5 is prevented from outputting a pulse to the terminal a. Conversely, AND gate G is opened.

Now, when the synchro contact BK turns on at s#fMt1,
TolJs141 circuit 3 has trigger pulse m on terminals e and d.
Generates 1g −1 and slg −2. As a result, the first thyristor T* and the second thyristor T are turned on, so that the discharge tube rte emits light.

At the same time, the control circuit 3 generates a terminal fK photometric pulse -1-4 to turn off the transistor Trl. I! Then, the capacitor c1 is charged by the current of the photodiode DP in response to the reflection ftK from the object. The charging voltage of capacitor CI is ! When a predetermined relationship with the reference voltage is reached at If t m, the comparator cP is inverted and the second control pulse s1g-5 is generated.The third si-risk TI, to which the second control pulse is applied via the aOR gate 01, is turned on. to close the commutation loop. Is this &C the second Cyrisk? .

is turned off, so the discharge tube FT stops emitting light.

If the time interval between times t1 and t- is shorter than the constant time τl, the operation will be as described in 5 above.

However, if this time interval is longer than the fixed time r1, the first pulse (wi
g-3) is the terminal of the control circuit 3 and the OR gate G1t-
RS K is applied to the third thyristor through the thyristor RS, and the flash light emission stops. Since the second control pulse automatically generates photons within a certain period of time TI, it is possible to synchronize the flash emission with the frame rate of the motor drive device. In addition, in order to ensure the proper appearance of continuous flashes, it is necessary to use the specified emitting device GN&! Binary values and object distancellll1
1t - If selected in advance, the flash light emission filter is controlled as described above, but the dimming display is performed as shown below. Since the output of the terminal f of the control circuit 3 is τL for a certain period of time, the OR gate G@ outputs 1H during this period.Then, the shift register SR receives the input for each flash yt. Second 1+1 input to terminal DK
Ji141 pulse (8 turtles g-5) t-read. That is.

When the 20th 1j-axis pulse is generated in the first N source light emitting signal, the Qt tB force of the left register becomes "L1" and the light emitting diode FD turtle, DI' lights up, and in the second time, the second
When the control pulse of Q* of the shift register is generated,
Q s output becomes 'L# and detection diode lj1%D
I':D 103' lights up. On the other hand, if the flash light emission is stopped by the mto control pulse 611 without generating the control pulse 2 in the third time, then the shift register's Qt
Since the output is @H1,4 and the Qs output is 1L, the light emitting diodes I) 1%Da':Ds and Ds' are lit.In this way, the ridges where the light emitting diodes are lit are unified. It corresponds to the number of successes, and the lighting and extinguishing of the light emitting diodes in the direction in which the light emitting diodes are arranged is a continuous flash. - Now, when this flash photography is finished and switch Sl is turned on, the NAND gate G
The Q output of l becomes ``H'', and the Q of NAND gate G becomes
The output becomes @L#. 7, it is reset by the 114# pulse of the shift register SR & MAP proverb m-, and enters the display mode of the flash'yt and the number of stitches mentioned in -1. Note that if the switch Bit-off is turned off, the above display operation will not be performed. Further, the constant time TI and the maximum light emission time Tl match, and the transistor Trl is turned on after TI (τ 婁) has elapsed from the time when the synchro contact SX is turned on, discharging the photoelectric charge of the cocidenser CS and starting the next light emission time. Prepare for flash photography.

(2) Operation when the motor drive device is not in use: At this time, the switch 8 is turned off and the first control pulse I-3 is not generated, so the second control pulse I-3 is not generated. 1llll-
A unified operation is performed using only pulses 1g-5. When switch 81 is off, 1H is applied to 4 children R of shift register 8R.
``If you apply it, you can turn off the flash and the display of the number of possible flashes.

Next, the construction circuit 50 will be explained. In Figure 2, A
1 to A- are operational term c1m units (hereinafter referred to as op amps),
cp, ~cp, are comparators. ZD,%ZDI
is a Zener diode. DI-1, DI-m, D
I-I is a diode. T1~Tr4&! The transistors o rl ~rlB &bi rl -I Nr
*-n is the resistance and r1' is the thermistor at 1%'
. -03-1~(:, -tttX capacitor.

IO%I, is a constant current W that generates an absolutely proportional *: current,! . is a fixed frost and a flowing source. ? Shizuku, resistance and feet (
The sign of tIt- represents its value.

Now, let the voltage of the connection point PI between the resistors rl and rl be .e, the voltage of the zener diode ZD be .l, and the transistor Trl connected to the output terminal of the OP amplifier A30. The emitter voltage Me, t' I 11
(S Correct current is calculated as Io. Therefore, OP amplifier A
The output pressure vx of 4 is (where ■ is the reverse saturation w waterfall, q is Kameko's ridge load, T is the viscous temperature, and is a Portsmann number), then the OP amplifier AI
Find the output breakdown voltage ■Y.

Current flowing through diode DI-1! D1 is OP amplifier A
, the non-inverting input particle is grounded f... 1. , =-+-- is 'C124r
I can kill. Therefore, .

Since the OP amplifier AI has a differential increase of 4@, r@ =
r l@= 11 = rll and the resistance 11m
1 constant, the output of the OP amplifier Al (voltage -IV-=9
It can be expressed as x-V. Ck-Cs(be(
3) Equation 1 becomes: Next, the base voltage V11 of the transistor Try is the output voltage V of the OP amplifier A, and the diode D, -s
Since it is the result of subtracting the forward voltage of ...(6) q II.

If we rearrange the equation (6), the constant radio wave I is 4 waves proportional to the feed temperature TK, so T rv IB = −−Lv*Q (61(1i
tL and Q are proportionality constants). Therefore, 141 R1,.

Let me do it.

By comparing equation (1) and equation (8) t, the collector KMk of the construction term Trl is unified resistance rllQ inner end turtle pressure vll=rl
l'' I(,, is proportional to the number NK of flash light emission 61 Th 1m. In other words, the voltage of Ji!I connection point P4 decreases as N increases. @ - @ ~ rrn and constant 11111 I
(Reference voltage determined as 2K) is the highest for comparator CP1 and gradually decreases thereafter, so when the voltage at connection point P4 decreases as the photovoltaic voltage of main capacitor CM increases, the output of comparator CPI changes from @Lm to '''H. ” to be reversed. Thereafter, the comparators CP=, CPs, . . . are inverted. Capacitors 03-1 to C1-n and resistor rl
The differential circuit emitted from l is the comparator CP1~CP! A pulse of Km is generated every time I is inverted. Waveform gIl Sugi circuit A
, applies this line segment pulse vertically to terminal a.

On the other hand, the terminal is 1 at the Q output of the NAND gate G.
When it becomes H#, the transistor Tr4 turns on and the connection point P
Reduce the voltage of s to ground potential. Therefore, ii continuation point P
The voltage and power of 4 rise in the potential trench of the electric cocoon line V, and the outputs of the comparators CP1 to CPn never invert from @L1 to @Hm.

Further, the thermistor r1 is arranged near the flash discharge tube FT, and changes its resistance value depending on the -H temperature of the flash discharge tube FT. In other words, as the temperature of the discharge WFT rises (for example, the discharge energy at the time of flash light emission is cited as a factor), the voltage at which flash light can be emitted tends to decrease, so the resistance value of the thermistor r, The voltage at the connection point Ps is increased by decreasing the voltage at the connection point Ps. From equation (7), voltage φ
If the value increases, the electric fiI also increases, and as a result, the number of pulses generated at the terminal 1 increases.

FIG. 3 is a circuit diagram showing another embodiment of the construction circuit. Components having the same functions as those in FIG. 2 are given the same reference numerals. In this embodiment, the outputs of comparators CP1 to CPt5 are “L”.
to 1H", the light emitting diodes D3-1~D
This is to display the number of times the corresponding light emitting diode lights up and flashes.

The 41st is an example of the firing circuit of the control circuit 3. In the figure, when the synchro contact 8x turns on and the terminal g becomes @L1, the first The one-shot multivibrator operates, and the output of the inverter Gel becomes @Lm for a certain period of time τ1. This way of output is inverter G1
4 through the inverter Ums through the terminal CK%
Child dK is transmitted. The time during which the inverter 011 is 1L'' is at% Silk 2 thyristor Tl % T
It's a long time since I turned on.

NAND gate Ga4, inverter G■, capacitor C
The second one-shot multivibrator consisting of 11% resistors R and l is activated when the output of the inverter Gll becomes 'L', and is a function of the time T1 when the output of the inverter Gll is -.
L". If the resistance Rss'1 is adjusted according to the speed, T1 will change. Inverter Gll, Contin f
The third one-ray multivibrator consisting of C■ and resistor R1m starts operating when the output of inverter Gll changes from @L" to @H# after a time τ has elapsed, and at a certain time i
Output @H11 during JJ r s.

A switch S is turned on and an inverter Gl is connected to a terminal t.
? When the output of is @Hm, synchro contact sX
When is turned on, the signal ``''L#'' is outputted through the ND gate Gll and the OR gate Gss for a subsequent period of -1 time. Similarly, the AND gate Gll outputs ``H'' to the terminal Ik for a certain period of time τ3 after the cutting edge of the inverter 011 becomes ``H''. That is, when the switch 83 is on (when photographing continuous interval 5), the first III control output signal Ig-3 and the narrow light pulse 1g-4 are for the same time period 1Lm.

Next, when switch s3 is turned off, NAND gate Gl
l outputs @H# only when synchro contact t3X is turned on. A fourth one-shot multivibrator f! consists of a NAND gate G■, an inverter Gam5 capacitor cHa, and a resistor R■. KoI'LK! It starts working,
Invar 9 Gs* appears for a certain period of time T4 @L”K
do. At this time, the output of the ND gate G is 1L'', so the terminal f remains at L'' for a certain period of time T4, which is the time required for the speedlight to emit maximum light.

FIG. 5 is a block diagram showing another embodiment of the MD tuning switch. The switch sl on the camera body side connected to the switch s■ and lJI+a cannot be set to 1L1. In this way, I can't do consecutive flashes nine great colors easily and make it 5.

According to the present invention, not only can it be used as a motor-tuned strobe, but it also has the advantage of being able to perform automatic flash control when automatic flash control is possible, as well as being able to warn you where the brightness has not adjusted during one flash. Furthermore, there is an advantage that a warning can be issued even when no light is emitted.

[Brief explanation of the drawing]

Figure s1 is a block diagram showing one embodiment of the present invention. FIG. 2 shows an example of a specific configuration of the detection circuit 5 in FIG. 1, and FIG. 113 is a T circuit diagram showing another example of the detection circuit. Figure iI4 is a diagram showing another example of the MD tuning device. ] CM Main capacitor FT Flash discharge tube 3 Control circuit G, OR gate T, 5th thyristor 9, MD tuning switch output - Person Nippon Kogaku Kogyo Co., Ltd. No. 4, Figure t5, 3 Procedural amendment September 1981 11th 2 Name of the invention Automatic flash control flashlight emitting device 3, Relationship to the case of the person making the amendment Patent applicant 41" 3-2-3 Marunouchi, Chiyoda-ku, Tokyo"
(4'11) Nippon Kogaku Kogyo Co., Ltd. (Name) 4 Agent 5 Subject of amendment "Detailed description of the invention" in the specification
Column (1) Insert "to terminal e" before "occurrence" on page 4, line 8 of the specification. (2) In the 11th line of the same page as above, insert "during continuous light emission" before "most-". (3) Correct "on" in line 6 of page 5 of the same page to "off". (4) "G2" in the third line of page 10 of the same page is corrected to "G6". (5) Correct "G," in line 4 of the same page to "G," (6) Correct "τ1" in line 13 of page 14 to "τ,". (7) Delete "circuit" on page 16, line 16 of the same letter. (8) "Thermistor" in the third line of page 17 of the same page is corrected to "POSITOR 1". (9) Correct "grain" in line 8 of page 18 of the same article to "end". (7) In the specification, page 19, page 19, line 19, insert ``a quadratic equation holds. That is,'' after ``put''. 0υ Same as above Fang Page 21 Fang Correct the left side rIJ of formula (8) to "Ic3". Correct "Thermistor" in the second line of page 23 of the same page to "Posistor". 031 Correct "thermistor" in line 8 of the same page as above to "posistor". 0# Insert "(" between "if it rises" and "for example" in the 5th line of the same page. Correct "decrease" in the 7th line of the same page to "rise." In the 1st line of the same page, ``decrease'' is corrected to ``increase.'' Correct "increase" in line 11 of the same page to "decrease". (19 Correct "increase" in line 12 of the same page to "decrease". Correct "Another embodiment" to "Modified example". Ql) Insert "In case of non-continuous flashing" before "Speedlight" on page 26, line 4 of the same.

Claims (1)

[Claims] a first circuit that supplies energy stored in the main capacitor C2 to a flash discharge tube for a certain amount of light; and a second circuit that enables the first circuit to operate when it is detected that a motor drive device is attached to the camera. An automatic light control flashlight emitting device characterized by comprising a circuit.