JPH08179403A - Stroboscopic consecutively photographing camera - Google Patents

Abstract

PURPOSE: To provide a stroboscopic consecutive photographing camera capable of consecutively photographing at a high speed by consecutively emitting strobe light with a single main capacitor. CONSTITUTION: The stroboscopic consecutive photographing camera capable of consecutively photographing by the consecutive light emission of a stroboscopic device 11 is provided with a mode setting means 25 for switching to a single light emission mode or a consecutive light emission mode in accordance with the fact that the stroboscope device 11 is used or not at the time of consecutively photographing, a power source circuit 12 for boosting a power supply voltage and charging a main capacitor 13 and a control circuit 18 simultaneously driving the power source circuit 12, while a winding circuit 22 executes the winding operation of a film 28, to charge the main capacitor 13, when a changeover to the consecutive light emission mode by the mode setting means 25 is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a flash continuous shooting camera,
More specifically, the present invention relates to a flash continuous shooting camera capable of continuously shooting by stroboscopically emitting a flash.

[0002]

2. Description of the Related Art Conventionally, various techniques have been proposed for causing a strobe to continuously emit light during continuous shooting.

As an example of such a device, for example, Japanese Unexamined Patent Publication No. 48-47328 has a plurality of main capacitors to store a larger amount of electric charge than a device having a single capacitor to continuously emit light. It is described that enables the.

Further, Japanese Laid-Open Patent Publication No. 61-289936 discloses a technical means for reducing the continuous shooting speed when the continuous light emission by the strobe does not follow the continuous shooting.

[0005]

However, in the one disclosed in Japanese Patent Laid-Open No. 48-47328, a plurality of main capacitors are required, so that the cost is increased and these capacitors are arranged. This requires a large space.

Further, the one disclosed in Japanese Patent Laid-Open No. 61-289936 has a drawback that when continuous light emission is carried out, the speed of continuous shooting is slowed down and high-speed continuous shooting may not be possible. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a strobe continuous shooting camera capable of continuously striking a strobe and performing high-speed continuous shooting using a single main capacitor. Has an aim.

[0008]

In order to achieve the above object, a strobe continuous shooting camera according to claim 1 of the present invention comprises:
In a flash continuous shooting camera that can continuously shoot with a flash, it can switch between single-flash mode and continuous-flash mode depending on whether or not the flash is used during continuous shooting, and boost the power supply voltage. It is provided with a charging means for charging the capacitor and a charging control means for driving the charging means during winding while switching to the continuous light emission mode.

The strobe continuous shooting camera according to claim 2 of the present invention is a strobe continuous shooting camera capable of continuously shooting by stroboscopically emitting a flash, and a single flash according to whether or not the strobe is used during continuous shooting. Mode switching means for switching to the mode or continuous light emission mode, and when the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode. Based on the charging voltage setting means for setting the voltage of the capacitor to the second voltage higher than the first voltage, and the second voltage value set by the charging voltage setting means when the continuous light emission mode is set. And a light emission amount control means for controlling the light emission amount of the strobe by discharging the charging voltage of the capacitor by a predetermined amount.

Further, in the strobe continuous shooting camera according to claim 3 of the present invention, in the strobe continuous shooting camera capable of continuously shooting the strobe, the single flash is performed depending on whether or not the strobe is used during the continuous shooting. Mode switching means for switching to the mode or continuous light emission mode, and when the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode. Discharge voltage setting means for setting the voltage of the capacitor to a second voltage higher than the first voltage and determining a discharge voltage for one time based on the exposure value determined by the camera and the second voltage value; Charging voltage control means for controlling the charging voltage of the capacitor based on the voltage set by the discharging voltage setting means.

[0011]

In the strobe continuous shooting camera according to the first aspect of the present invention, the strobe can continuously emit light to continuously shoot, and the single flash mode is selected depending on whether or not the mode switching means uses the strobe during continuous shooting. Alternatively, switching to the continuous light emission mode, the charging means boosts the power supply voltage to charge the capacitor, and the charging control means drives the charging means during winding while switching to the continuous light emission mode.

Further, the stroboscopic continuous shooting camera according to the second aspect of the present invention is capable of continuously shooting by stroboscopically emitting the strobe, and the mode switching means takes a single shot depending on whether or not the strobe is used during continuous shooting. When switching to the light mode or the continuous light emission mode, the charging voltage setting means sets the charging voltage of the capacitor to the first voltage when the mode switching means switches to the single light emission mode, and switches to the continuous light emission mode. Sets the voltage of the capacitor to a second voltage which is higher than the first voltage, and to the second voltage value set by the charging voltage setting means when the light emission amount control means is set to the continuous light emission mode. Based on this, the amount of light emitted from the strobe is controlled by discharging the charging voltage of the capacitor by a predetermined amount.

Furthermore, the continuous stroboscopic camera according to the third aspect of the present invention is capable of continuously shooting by stroboscopically emitting the strobe, and the mode switching means takes a single shot depending on whether or not the strobe is used during continuous shooting. When the discharge voltage setting means is switched to the light mode or the continuous light emission mode and the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when the continuous light emission mode is switched to. Sets the voltage of the capacitor to a second voltage higher than the first voltage and determines a discharge voltage for one time based on the exposure value and the second voltage value determined by the camera, and the charge voltage control means Controls the charging voltage of the capacitor based on the voltage set by the discharging voltage setting means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 and 9 show a first embodiment of the present invention, and FIG. 1 is a block diagram showing the main configuration of a strobe continuous shooting camera.

This strobe continuous shooting camera has a strobe circuit 41 for emitting light, a mode switching means 42 for switching the light emission state of the strobe circuit 41 to a single light emission mode or a continuous light emission mode, and a main capacitor included in the strobe circuit 41. Control means 44 for controlling the charging operation of the
And film winding control means 43 for controlling the film winding operation after shooting, and when the mode switching means 42 is switched to the continuous light emission mode, during film winding performed after the end of each frame shooting. By simultaneously charging the strobe, the continuous emission time is made shorter than in the case where the strobe is charged after the film winding is completed.

FIG. 2 is a block diagram showing the configuration of the electric circuit of the strobe continuous shooting camera. This strobe continuous shooting camera drives a strobe device 11 that emits light toward a subject, a photometric circuit 19 that measures the luminance of the subject, a subject distance detection circuit 20 that detects the distance to the subject, and a focus lens 29. Lens drive circuit 21 and film 2
8, a hoisting circuit 22 for hoisting, a focal length detection circuit 23 for detecting the focal length of the zoom lens, a shutter drive circuit 24 for driving a shutter at the time of exposure, and a mode as a mode switching means for setting continuous shooting mode. Setting means 25
A power switch SW1 for turning on and off the power of the camera, a release switch SW2 for inputting a shooting start signal, a status display unit 30 for displaying the status such as the mode setting and the number of frames, and charging control. And a control circuit 18 for controlling the entire camera including these circuits.

The strobe device 11 has a power supply circuit 12 which is a charging means whose power supply output is controlled by the control circuit 18, and a main capacitor 13 which is connected to + and-output terminals of the power supply circuit 12 to be charged. The anode terminal is connected to the + output terminal of the power supply circuit 12, and the cathode terminal is connected to the insulated gate bipolar transistor (In
A flash arc tube which is connected to the collector of a simulated gate bipolar transistor (hereinafter referred to as an IGBT) 16 and discharges the charged charge of the main capacitor 13 by applying a trigger voltage to the trigger electrode to emit a flash light. 14, a trigger circuit 15 having an output terminal connected to the trigger electrode terminal of the flash light emitting tube 14 and applying a trigger voltage to the flash light emitting tube 14 in response to a light emission signal from the control circuit 18, and the flash light emitting tube 14 A collector is connected to the negative pole terminal, an emitter is connected to the negative output terminal of the power supply circuit 12, and a gate is connected to the gate control circuit 17 to control the flash emission of the flash arc tube 14. And an output terminal is connected to the IGBT 16 and a gate of the IGBT 16 is supplied by a signal from the control circuit 18. It is constituted by a gate control circuit 17 biasing.

When the strobe device 11 is caused to emit light, the light emission signal from the control circuit 18 is
The signals are output to the trigger circuit 15 and the gate control circuit 17 at the same time.

A photometric command signal is input from the control circuit 18 to the photometric circuit 19 to measure the subject brightness in order to determine the exposure for photographing. It is input from the photometric circuit 19 to the control circuit 18.

A subject distance detection command signal is inputted from the control circuit 18 to the subject distance detecting means 20 to detect the subject distance, and the detected subject distance signal is outputted from the subject distance detecting means 20. It is input to the control signal 18.

The control circuit 18, which receives the subject distance signal, outputs a lens drive signal to the lens drive circuit 21 to drive the focus lens 29 in order to adjust the focal length of the photographing lens, and the focus lens 29 is driven by a predetermined amount. Whether or not it is driven is input to the control circuit 18.

A film winding command signal is input from the control circuit 18 to the film winding circuit 22, and the film 28 is wound by one frame by this command, and the film 28 is rotated by one frame. A signal indicating the result of whether or not it is wound up is input to the control circuit 18.

A focal length detection command signal from the control circuit 18 is input to the focal length detection circuit 23 to detect the focal length of the zoom lens.
The detected focal length signal of the zoom lens is input from the focal length detection circuit 23 to the control circuit 18.

A shutter drive command signal is input to the shutter drive circuit 24 from the control circuit 18 to drive the shutter, and a signal indicating whether or not the shutter has been driven in a predetermined manner is input to the control circuit 18. It is like this.

Further, the continuous shooting mode is set by the mode setting means 25, and a signal indicating whether or not continuous shooting is performed is input to the control circuit 18.

Next, the operation of the strobe device 11 will be described. First, the signal output from the control circuit 18 controls the output of the power supply circuit 12, and the power supply circuit 12 controls the output of the main capacitor 13
Is charged.

The gate control circuit 17 biases and controls the IGBT 16 by the signal from the control circuit 18, and at the same time, the trigger circuit 15 sends a trigger signal to the flash light emitting tube 14 by the signal from the control circuit 18. Outputs the above main capacitor 13
By discharging the charged electric charge of the flash light emitting tube 14
Emits a flash of light.

Next, strobe charging control and hoisting motor control will be described. FIG. 3 shows a strobe device 11
3 is a circuit diagram showing a more detailed configuration of FIG.

As shown in the figure, a main capacitor 13 is provided at both ends of the power source E1 constituting the power source circuit 12, a power source boosting circuit 1 constituting the power source circuit 12 for boosting the voltage of the power source E1, and a main circuit. The voltage detection circuit 2 for detecting the charging voltage of the capacitor 13 and the trigger circuit 15 are connected. The operations of the power supply booster circuit 1, the voltage detection circuit 2, and the trigger circuit 15 are controlled by the control circuit 18.

The power supply boosting circuit 1 includes transistors Tr1 and Tr2 and a resistor R5 connected in series, a series circuit of a primary winding of the transformer T1 and a transistor Tr3, a secondary winding of the transformer T1 and a resistor R6, and a rectifier. And a series circuit of the fast recovery diode D1.

The resistor R1 is between the emitter and the base of the transistor Tr1, and the resistor R2 is the transistor Tr1.
Of the transistor Tr2 and the CHG terminal of the control circuit 18, and the resistor R4 is connected between the collector of the transistor Tr2 and the base of the transistor Tr3.

The voltage detection circuit 2 has resistors R7 and R
8 is composed of a voltage dividing circuit by a series circuit, and the connection point of these resistors R7 and R8 is the control circuit 18
Is connected to the VST terminal.

Further, the trigger circuit 15 includes a resistor R1.
1 and thyristor SCR1 and this thyristor SCR
Resistor R9 and R10 connected to the gate of the first resistor and resistor R1
1 and a thyristor SCR1. One end of the capacitor C1 is connected, and the other end of the capacitor C1 is connected to a transformer T2. The resistor R9 is connected to the STRG terminal of the control circuit 18.

Between the voltage detection circuit 2 and the trigger circuit 15, a slow recovery diode D2 for preventing the electric charge of the main capacitor 13 from leaking through the voltage detection circuit 2 is connected.

Further, a flash arc tube 14 and a gate control type semiconductor element (IGBT) 1 are provided between both ends of the power source E1.
6 series circuit, resistor R13 and Zener diode D3
, A transistor Tr4 whose collector is connected to the cathode of the Zener diode D3 and whose base is connected to the SCONT terminal of the control circuit 18 via a resistor R15, and between the base and emitter of this transistor Tr4. And a resistor R14, and a resistor R12 is connected between the gate of the IGBT 16 and the cathode of the Zener diode D3.

Here, the slow recovery diode D
2 will be described. This slow recovery diode D
In No. 2, a current as described below flows when positive and negative voltages are alternately applied.

Since accumulated charges exist near the junction of the diode in which a current flows in the forward direction, even if a reverse bias current is suddenly applied, the accumulated charges are recombined and disappear. During this period, current flows in the opposite direction. The time during which the current flows in this reverse direction is called the reverse recovery time of the diode.

The reverse recovery time is fast in the fast recovery diode, and the diode used in the strobe circuit in the past is the fast recovery diode.

On the other hand, the slow recovery diode has a longer reverse recovery time than the fast recovery diode.

In order to manufacture this slow recovery diode, it is necessary to prolong the life of carriers, which is a major factor that determines the reverse recovery time of the diode. For this reason, the diffusion temperature of silicon is lowered, and Increase impurity purity. Furthermore, the capacity of the joint portion is increased by increasing the joint area.

In this embodiment, the strobe device 11 is constructed by using the slow recovery diode thus produced.

Next, referring to the flow chart of FIG.
The operation of the strobe device 11 will be described.

When the power switch SW1 is turned on (step S1), charging of the main capacitor 13 is first started (step S2). And the control circuit 1
8 monitors the voltage of the VST terminal (step S3),
When the VST terminal reaches the set voltage, the charging of the main capacitor 13 is stopped (step S4).

Now, it is assumed that the main capacitor 13 has already been charged with a voltage of, for example, 300V. Here, when the release switch SW2 is turned on (step S
5) Start charging (step S6), operate the power supply booster circuit 1 for a short period of time, and start VS of the control circuit 18.
The voltage of the main capacitor 13 is checked by determining whether the T terminal is equal to or higher than a predetermined voltage (step S7).

This will be described in detail with reference to the time chart of FIG.

When the CHG terminal of the control circuit 18 is set to the low level, the power supply booster circuit 1 operates and its output generates a voltage of 300 V in VMC1 (see FIG. 3). At this time, of course, VMC2 (see FIG. 3) is also 300 V (actually, about 0.
VMC1 becomes higher by 8V, but it is ignored here. ). Then, VS of the control circuit 18
A voltage obtained by dividing the voltage of VMC1 by the resistors R7 and R8 is generated at the T terminal.

When a normal fast recovery diode is used as the diode D2, the waveform of the VMC1 drops to about 200 V in accordance with the oscillation cycle of the power supply booster circuit 1 as shown by the dotted line in FIG. I will end up.

On the other hand, when the slow recovery diode is used as the diode D2, a constant voltage (300 V) can be maintained as shown by the solid line in the figure, and the voltage is the same as when the fast recovery diode is used. There is no depression.

This is for the reason described below.

That is, a forward bias and a reverse bias are alternately applied to the diode D2 in accordance with the oscillation cycle of the power supply booster circuit 1. At this time, in the fast recovery diode, a small amount of current flows in the reverse direction only for the first short time at the moment when the reverse bias is applied, but thereafter, the reverse current does not flow. Therefore, at this time, the voltage of VMC1 drops.

On the other hand, when the slow recovery diode is used as the diode D2, the current flows in the reverse direction while the reverse bias is applied. Therefore, this current flows through the resistors R7, R8, and these resistors R7, R8
A voltage is generated at both ends of VMC, and VMC1 is maintained at the same voltage as VMC2.

That is, the characteristics of the slow recovery diode used here satisfy IR × R ≧ VMC2, where IR is the current flowing in the reverse direction and R is the series resistance value of the resistors R7 and R8. There is a need. For example, R = 10 MΩ, VMC
When 2 = 300V, IR ≧ 30 μA.

In this way, since a reverse current flows during charging of the main capacitor 13, the main capacitor 13
It is possible that the charging time will be longer, but the current flowing in the reverse direction is several tens of microamperes, which is very small compared to the forward current, that is, the current that charges the main capacitor 13, and the increase in charging time is neglected. It's so small that it doesn't really matter.

Thus, in step S7, if the VST terminal of the control circuit 18 is equal to or higher than the predetermined voltage, the process shifts to the shutter sequence (step S8) and ends, otherwise release lock is performed (step S).
9).

Next, FIG. 6 is a circuit diagram showing a winding circuit 22 for winding the film 28.

The hoisting circuit 22 has a motor driving circuit 4 and a motor energizing circuit 5.

That is, the motor control signals I1, I2, I3 are sent from the control circuit 18 to the motor drive circuit 4 as shown in FIG.
The motor drive circuit 4
Outputs a signal to each terminal of the motor energizing circuit 5.

More specifically, the output terminals O1, O2, O3, O4 of the motor drive circuit 4 are transistors Q for controlling the forward / reverse rotation of the motor M provided in the motor energizing circuit 5.
5, Q6, Q7, and Q8, respectively. Further, the motor energizing circuit 5 is connected with diodes D2, D3, D4 and D5 for absorbing the back electromotive force of the motor M.

Next, the winding and rewinding operations of the film 28 by the winding circuit 22 will be described.

The control of the winding / rewinding operation of the film 28 is performed by controlling the forward / reverse rotation of the motor M depending on which transistor of the motor energizing circuit 5 is operated by the output of the motor driving circuit 4. .

When the motor control signals I1, I2, I3 are supplied from the control circuit 18 to the motor drive circuit 4, the motor drive circuit 4 outputs its output terminals O1, O.
2, O3 and O4 are set in the states shown in Table 1 below.

[0062]

[Table 1]

From the control circuit 18, I1 = I2 =
When a motor control signal of 0, I3 = 1 is applied to the motor drive circuit 4, the output terminals O1 and O3 become "L" and the output terminals O2 and O4 become "L" as shown in the case (ii) of Table 1 above. Becomes "H". As a result, the motor energizing circuit 5
The transistors Q5 and Q7 are turned off, and the transistors Q6 and Q8 are turned on.

In this way, the motor M is energized in the CW direction indicated by the right arrow in FIG. 6 to rotate in the forward direction to wind up the film 28.

When the motor control signal from the control circuit 18 becomes I1 = 0 and I2 = I3 = 1, as shown in the case (i) of Table 1, the output terminals O1, O2, Since both O3 and O4 are "L", the transistors Q5, Q6, Q7 and Q8 are all off.

Therefore, the power supply to the motor M is stopped, and the electromagnetic energy stored in the motor M is transferred to the back electromotive force prevention diodes D2 and D3, the power source impedance of the DC power source, and the back electromotive force prevention diodes D4 and D5. Discharged by a closed loop. Thus, the motor M is braked.

Further, when the motor control signal from the control circuit 18 becomes I1 = I3 = 0, I2 = 1, as shown in the case (iii) of Table 1, the output terminals O1 and O3 of the motor drive circuit 4 become At the "H" level, O2 and O4 become the "L" level, so that the transistors Q5 and Q7 are turned on and the transistors Q6 and Q8 are turned off.

Therefore, the motor M is energized in the CCW direction indicated by the left arrow in the figure to reversely rotate and rewind the film 28.

When the motor control signal I1 from the control circuit 18 becomes 1, regardless of I2 and I3, as shown in the case (iv) of Table 1, the output terminal O1 of the motor drive circuit 4 is outputted. , O2, O3, O4 have high impedance.

Therefore, the transistors Q5, Q6, Q7, Q8 of the motor energizing circuit 5 are all turned off, and the motor M remains stopped.

Further, when the motor control signal from the control circuit 18 becomes I1 = I2 = I3 = 0, as shown in the case (v) of Table 1 above, the output terminals O1, O2, O3,
Since all of O4 becomes high impedance, the motor M remains stopped as in the case (iv).

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the power switch SW1 is turned on (step S11), charging of the strobe is started (step S12). The charging operation is continued until the set voltage, which is usually called full charge, is reached (step S13), and when the set voltage is reached, the charging is stopped (step S14).

Next, when the strobe light emission mode for emitting the strobe light is set (step S15) and the release switch SW2 is turned on (step S16), the voltage of the main capacitor 13 is checked first (step S1).
7).

This voltage value is usually lower than the set voltage (full charge voltage) in step S13 and the flash tube 1
The voltage is set to be higher than the lowest light-emission possible voltage of 4.

If the voltage is less than the predetermined voltage, the release lock is performed (step S18). If the voltage is more than the predetermined voltage, the AF sequence is performed (step S19) and the light emission and exposure sequence is performed (step S20). It is judged whether or not the continuous shooting mode is set (step S21). When the single shooting mode is not the continuous shooting mode, the film 28 is wound up (step S22), strobe charging is performed (step S23), and a series of operations is ended. To do.

When the continuous shooting mode is set in step S21, the film 28 is wound up and the flash charging is simultaneously performed (step S24) until the predetermined continuous shooting frame ends (step S25). The flash continuous shooting is performed by repeating steps S19 to S25.

Further, here, the AF sequence is performed for each frame of continuous shooting, but AF is performed only for the first frame of continuous shooting frames and not for subsequent frames. Is also good.

As described above, in the continuous shooting mode, the continuous shooting speed can be increased by simultaneously charging the strobe during film winding.

The operation in the continuous shooting mode described above will be described with reference to the time chart of FIG. 9 showing the present embodiment in comparison with the time chart of FIG. 8 showing the conventional example.

FIG. 8 shows a case of conventional stroboscopic continuous shooting, in which the power switch SW1 is turned on and the strobe is charged, and then the release switch SW2 is turned on to emit light, and then the film is wound. Then, after the film winding is completed, the flash is charged, and the next flash is emitted, and the flash continuous shooting is performed.

On the other hand, in the case of the continuous flash photographing of the present embodiment, as shown in FIG.
It emits light when W2 is turned on, and then film 2
While winding 8, the strobe is being charged at the same time. In this way, since the film winding and strobe charging are activated at the same time, the strobe charging time will be slightly longer, but compared to the conventional case where strobe charging is performed after film winding is completed, the total continuous shooting speed Can be raised.

Further, here, when the winding of the film 28 and the charging of the strobe are both completed, the next light emission is started. However, if the strobe charging is not completed when the winding is completed, the strobe light is discharged. The charging may be terminated and the next light emission may be started.

If the light emission permission voltage is not reached even after the charge is terminated, after charging up to the light emission permission voltage,
The charging operation may be terminated.

According to the first embodiment, the continuous shooting speed can be increased because the strobe is charged at the same time when the film is wound during continuous shooting.

10 to 12 show the second embodiment of the present invention, and FIG. 10 is a block diagram showing the main structure of a strobe continuous shooting camera. In the second embodiment, description of the same parts as those of the first embodiment described above will be omitted, and mainly different points will be described.

As shown in FIG. 10, this strobe continuous shooting camera changes the light emission state of the strobe circuit 41 to a single light emission mode depending on whether or not the strobe is used during continuous shooting. Alternatively, the mode switching means 42 for switching to the continuous light emission mode, and when the mode switching means 42 is switched to the single light emission mode, the charging voltage of the capacitor of the strobe circuit 41 is set to the first voltage, and the continuous light emission mode is set. The charging voltage setting means 46 for setting the voltage of the capacitor to the second voltage higher than the first voltage when switched to the above, and the capacitor based on the voltage set by the charging voltage setting means 46. By including the charging voltage control means 45 for controlling the charging voltage of the continuous light emission, it is possible to increase the amount of light for each continuous light emission, and Those that are configured to be able to or.

Next, the operation of the strobe continuous shooting camera of the second embodiment will be described with reference to the flowchart of FIG.

In the above-described first embodiment, the strobe is recharged for each frame, but in the second embodiment,
This is a case where a series of strobe continuous shooting is performed without using the recharge for each frame and using the charge of the main capacitor initially stored when performing continuous shooting.

When the power switch SW1 is turned on (step S31), charging of the strobe is started (step S32). Then, the charging operation is continued until the set voltage is reached (step S33), and the charging is stopped when the set voltage is reached (step S34).

Next, when the strobe light emission mode for strobe light emission is set (step S35) and the release switch SW2 is turned on (step S36), the voltage of the main capacitor 13 is checked first (step S3).
7).

If the voltage is less than the predetermined voltage, the release lock is performed (step S38). If the voltage is more than the predetermined voltage, the AF sequence is performed (step S39), the shutter is opened (step S40), and then the light is emitted. The light emission is started (step S41), and when the predetermined light emission time t1 has elapsed (step S42), the light emission is stopped (step S4).
3).

This light emission time t1 depends on the control circuit 1
It can be obtained by calculating in the control circuit 18 from the necessary amount of strobe light and the voltage of the first main capacitor 13 calculated in step 8 or by referring to the table value.

Next, the shutter is closed (step S4
4), the film 28 is wound by one frame (step S4
5) Until the continuous shooting frame ends (step S46), the continuous shooting is repeatedly performed while changing the light emission time t1 of each frame (step S47).

The operation of the second embodiment will be further described with reference to the time chart of FIG.

After the power switch SW1 is turned on and the strobe is charged, when the release switch SW2 is turned on, stroboscopic continuous shooting is started.

Then, as shown in the figure, by making the light emission time t1 of the second light emission longer than that of the first light emission,
Even if the voltage of the main capacitor 13 decreases with each light emission, the emitted light amount of each frame can be the same.

It should be noted that the number of times continuous shooting is possible is determined based on the information on the subject distance, the lens diaphragm, the shutter speed, the ISO sensitivity, etc., and the information on the voltage of the first main capacitor, and the number is displayed. The user may be notified by doing so. In this case, if continuous shooting of a predetermined number of frames cannot be performed, a warning may be issued or release lock may be performed.

According to the second embodiment as described above, the flash is continuously charged at a high speed because it is charged once at the beginning of continuous shooting instead of recharging each frame. Is.

Further, the voltage of the main capacitor is not detected for each light emission, but the light emission time of each frame is predicted from the voltage of the first main capacitor so that the main capacitor is emitted each time. Strobe continuous shooting can be performed at a higher speed than in the case of detecting voltage.

FIG. 13 shows the third embodiment of the present invention and is a flow chart showing the operation of the strobe continuous shooting camera. In the third embodiment, the above-mentioned first and second
A description of the same parts as those in the embodiment will be omitted, and only different points will be mainly described.

The main structure of the strobe continuous shooting camera of the third embodiment is the same as that described in the second embodiment with reference to FIG.

Next, the operation of the strobe continuous shooting camera of the third embodiment is as shown in FIG.

That is, when the power switch SW1 is turned on (step S51), charging of the strobe is started (step S52). Then, the charging operation is continued until the full charge voltage VF is reached (step S53), and when the full charge voltage VF is reached, the charging is stopped (step S54).

Next, after the strobe light emission mode for firing the strobe light is set (step S55) and the continuous shooting mode is set (step S56), the release switch SW is set.
When 2 is turned on (step S57), it is first checked whether the voltage of the main capacitor 13 has become equal to or higher than a predetermined voltage VH higher than the normal full charge voltage VF (step S58).

If the voltage is less than the predetermined voltage VH, flash charging is further performed (step S59), and when the voltage exceeds the predetermined voltage, the AF sequence is performed (step S60) and the shutter is opened (step S61). The light emission is started (step S62), and when the predetermined light emission time t1 has elapsed (step S63), the light emission is stopped (step S64).

Then, the shutter is closed (step S6).
5), film 28 is wound by one frame (step S6
6) Until the continuous shooting frame ends (step S67), the continuous shooting is repeatedly performed while changing the light emission time t1 of each frame (step S68).

As described above, the third embodiment is different from the second embodiment in that the continuous shooting is performed after the shutter is charged to VH higher than the normal full charge voltage VF after the release. Is different.

Normally, the full charge voltage VF is set to the rated work voltage of the main capacitor 13. If this is 330V, the surge voltage rating of the main capacitor 13 is about 350 to 360V, so there is no practical problem if the voltage VH is applied only for a short time as in this embodiment.

Although VH is set to be higher than the full charge voltage VF here, VH = VF may be set when there is no margin in the withstand voltage of the main capacitor and other elements. Even in this case, during continuous shooting, the same effect can be obtained because the battery is fully charged to a voltage higher than the normal release lock voltage.

According to the third embodiment, the same effect as that of the second embodiment described above can be obtained, and the amount of light emission for each light emission can be increased as compared with the second embodiment.

FIG. 14 shows a fourth embodiment of the present invention and is a flow chart showing the operation of the strobe continuous shooting camera. In the fourth embodiment, description of the same parts as those of the first to third embodiments will be omitted, and only different points will be mainly described.

The main structure of the strobe continuous shooting camera of the fourth embodiment is similar to that described in the second embodiment with reference to FIG.

Next, the operation of the continuous flash photographing camera of the fourth embodiment is as shown in FIG.

That is, when the power switch SW1 is turned on (step S71), charging of the strobe is started (step S72). The charging operation is continued until the full charge voltage VF is reached (step S73), and the charging is stopped when the full charge voltage VF is reached (step S74).

Next, the flash emission mode for emitting the flash is set (step S75), and the continuous shooting mode is set (step S76), and then charging is started (step S77). Then, when the voltage of the main capacitor 13 reaches a predetermined voltage VH higher than the normal full charge voltage VF (step S78), the release switch SW2 is released.
When is turned on (step S79), it is checked whether the voltage of the main capacitor 13 is the voltage VH or more (step S80).

If the voltage is less than the predetermined voltage VH, strobe charging is further performed (step S81). When the voltage exceeds the predetermined voltage, the AF sequence is performed (step S82) and the shutter is opened (step S83). The light emission is started (step S84), and when the predetermined light emission time t1 has elapsed (step S85), the light emission is stopped (step S86).

Next, the shutter is closed (step S8
7), film 28 is wound by one frame (step S8
8) Until the continuous shooting frame ends (step S89), the continuous shooting is repeatedly performed while changing the light emission time t1 of each frame (step S90).

As described above, the fourth embodiment is almost the same as the above-mentioned third embodiment, except that charging to VH is started when the continuous shooting mode is set.

According to the fourth embodiment as described above, substantially the same effect as the above-mentioned third embodiment is obtained, and the time for recharging after the release is shorter than that in the third embodiment.
Release time lag can be shortened.

FIGS. 15 and 16 show the fifth embodiment of the present invention, and FIG. 15 is a block diagram showing the main structure of a strobe continuous shooting camera. In the fifth embodiment, description of the same parts as those of the first to fourth embodiments will be omitted, and only different points will be mainly described.

As shown in FIG. 15, this strobe continuous shooting camera has a strobe circuit 41 for emitting light, a mode switching means 42 for switching the light emitting state of the strobe circuit 41 to a single light emission mode or a continuous light emission mode, and this mode. Exposure setting means 49 for setting the exposure by the strobe light to the under side when the switching means 42 is switched to the continuous light emission.
And a light emission quantity setting means 48 for setting the light quantity of the strobe based on the exposure setting means 49, and a light quantity controlling means 47 for controlling the light quantity of the strobe circuit 41 based on the light emitting quantity setting means 48. , A structure configured to shorten the continuous light emission time by reducing the consumption of the electric charge of the main capacitor of the stroboscope, which is consumed for each light emission, and shortening the charging time of the main capacitor after the light emission. Is.

Next, the operation of the strobe continuous shooting camera of the fifth embodiment is as shown in FIG.

That is, when the power switch SW1 is turned on (step S91), charging of the strobe is started (step S92). Then, the charging operation is continued until the predetermined voltage is reached (step S93), and the charging is stopped when the predetermined voltage is reached (step S94).

Next, when a strobe light emission mode for emitting a strobe light is set (step S95) and the release switch SW2 is turned on (step S96), it is checked whether the voltage of the main capacitor 13 is equal to or higher than a predetermined voltage (step S96). Step S97).

If the voltage is less than the predetermined voltage, the release lock is performed (step S98). If the voltage is more than the predetermined voltage, the AF sequence is performed (step S99).

Subsequently, it is judged whether or not the continuous shooting mode is set (step S100). If the continuous shooting mode is not set, the strobe light emission time t1 is set (step S102), the shutter is opened, and the exposure is started ( In step S103, the flash light emission is started with the normal light emission amount (step S1).
04), after waiting for the light emission time t1 to elapse (step S105), the light emission is stopped (step S106), the shutter is closed, and the exposure is finished (step S107). After that, the film 28 is wound up by one frame (step S1
08), the strobe is charged (step S109), and in this case, the continuous shooting mode is not set (step S11).
0) It ends as it is.

On the other hand, if the continuous shooting mode is set in step S100, under-correction of the strobe light amount is performed (step S101). This under-correction amount is preferably set within an allowable latitude on the under side of the negative film, for example.

After that, the above steps S102 to S109 are performed. Since it is the continuous shooting mode this time (step S110), it is judged whether or not the continuous shooting frame is finished (step S111), and the continuous shooting frame is finished. If not, the light emission time t1 is changed (step S112) and the process returns to step S102.

Although the strobe is charged here after the film is wound up, the strobe may be charged at the same time during the film winding as in the first embodiment. Needless to say.

According to the fifth embodiment, the amount of light emitted from each frame at the time of continuous shooting can be reduced to shorten the recharging time and increase the continuous shooting speed.

[Additional Notes] According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.

(1) In a strobe continuous shooting camera capable of continuously shooting by stroboscopically emitting a flash, a mode switching means for switching to a single flash mode or a continuous flash mode depending on whether or not the flash is used during continuous shooting. , When the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode, the voltage of the capacitor is set to the first voltage. The charging voltage setting means sets the second voltage higher, and determines the discharge voltage for one discharge based on the exposure value determined by the camera and the second voltage value, and the set mode continues. In the case of the light emission mode, a correction means for correcting the voltage value set by the charging voltage setting means with respect to the exposure value, and the charging voltage setting means or the correction hand. A strobe continuous shooting camera, comprising: a charging voltage control means for controlling a charging voltage of a capacitor based on a step.

(2) The strobe continuous shooting camera according to appendix 1, wherein the correction means corrects the exposure value so that the exposure value becomes a predetermined undershoot within the latitude range of the film.

(3) In a strobe continuous shooting camera capable of continuously shooting by stroboscopically emitting a flash, a mode switching means for switching to a single flash mode or a continuous flash mode depending on whether or not the flash is used during continuous shooting. , When the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode, the voltage of the capacitor is set to the first voltage. A charging voltage setting means for setting a higher second voltage, and when the set mode is the single light emission mode, the charging voltage of the capacitor is charged to the first voltage set above, and in the continuous light emission mode. And a charging voltage control means for emitting light by a predetermined voltage value after each photographing after charging to the second voltage. camera.

(4) In a strobe continuous shooting camera capable of continuously shooting by stroboscopically emitting a flash, a mode switching means for switching to a single flash mode or a continuous flash mode depending on whether or not the flash is used during continuous shooting. Charging means for boosting the power supply voltage to charge the capacitor, charging control means for driving the charging means during winding while switching to the continuous light emission mode, and exposure value setting means for setting the exposure value. A light emission level determining means for determining the lowest level of light emission that allows exposure based on the exposure value setting means; and a light emission amount control means for controlling the strobe continuous shooting light emission amount based on the light emission level determining means. ,
A flash continuous shooting camera characterized by being equipped with.

(5) The charge control means includes a booster circuit for charging the capacitor, and activates the booster circuit only during film winding regardless of whether or not charging to a predetermined voltage is completed. The stroboscopic continuous shooting camera described in Appendix 4.

(6) The above charge control means, when charging to a predetermined voltage is not completed during film winding,
5. The strobe continuous shooting camera according to appendix 4, further comprising a light emission permission unit that allows the next light emission after charging to the predetermined voltage.

(7) The above charge control means, when charging to a predetermined voltage is not completed during film winding,
5. The strobe continuous shooting camera according to appendix 4, further comprising a light emission prohibiting unit that prohibits the next light emission.

(8) In a strobe continuous shooting camera capable of continuously photographing by strobe light emission, charging means for boosting a power supply voltage to charge a capacitor, and charging control means for driving the charging means during winding. A strobe continuous shooting camera characterized by being equipped with.

[0141]

As described above, according to the strobe continuous shooting camera of the present invention, a single main capacitor can be used to continuously emit light from the strobe for high-speed continuous shooting.

[Brief description of drawings]

FIG. 1 is a block diagram showing the main configuration of a strobe continuous shooting camera according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an electric circuit of the strobe continuous shooting camera according to the first embodiment.

FIG. 3 is a circuit diagram showing a configuration of a strobe device according to the first embodiment.

FIG. 4 is a flowchart showing the operation of the strobe device according to the first embodiment.

FIG. 5 is a time chart showing the operation of the strobe device according to the first embodiment.

FIG. 6 is a circuit diagram showing a winding circuit for winding the film of the first embodiment.

FIG. 7 is a flowchart showing the operation of the strobe continuous shooting camera according to the first embodiment.

FIG. 8 is a time chart showing an operation at the time of conventional continuous shooting with a flash.

FIG. 9 is a time chart showing an operation at the time of continuous shooting with a flash according to the first embodiment.

FIG. 10 is a block diagram showing the main configuration of a strobe continuous shooting camera according to a second embodiment of the present invention.

FIG. 11 is a flowchart showing an operation of the strobe continuous shooting camera according to the second embodiment.

FIG. 12 is a time chart showing an operation at the time of continuous shooting with a flash according to the second embodiment.

FIG. 13 is a flowchart showing the operation of the strobe continuous shooting camera according to the third embodiment of the present invention.

FIG. 14 is a flowchart showing the operation of a strobe continuous shooting camera according to a fourth embodiment of the present invention.

FIG. 15 is a block diagram showing the main configuration of a strobe continuous shooting camera according to a fifth embodiment of the present invention.

FIG. 16 is a flowchart showing the operation of the strobe continuous shooting camera according to the fifth embodiment.

[Explanation of symbols]

 11 ... Strobe device 12 ... Power supply circuit 13 ... Main capacitor 14 ... Flash arc tube 18 ... Control circuit (charging control means) 22 ... Winding circuit 25 ... Mode setting means (mode switching means) 41 ... Strobe circuit 42 ... Mode switching means 43 ... Film winding control means 44 ... Charging control means 45 ... Charging voltage control means 46 ... Charging voltage setting means 47 ... Emission light amount control means 48 ... Emission light amount setting means 49 ... Exposure setting means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akira Inoue 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Hitoshi Maeno 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A strobe continuous shooting camera capable of continuously shooting a strobe for continuous shooting, and mode switching means for switching to a single-flash mode or a continuous-flash mode depending on whether or not the strobe is used during continuous shooting, Strobe continuous shooting, comprising: charging means for boosting a power supply voltage to charge a capacitor; and charging control means for driving the charging means during winding while being switched to the continuous light emission mode. camera. 2. A strobe continuous shooting camera capable of continuously shooting a strobe to continuously shoot, and mode switching means for switching to a single-flash mode or a continuous-flash mode depending on whether or not the flash is used during continuous shooting, When the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode, the voltage of the capacitor is set to be higher than the first voltage. A charging voltage setting means for setting a high second voltage, and a predetermined amount of charging voltage for the capacitor based on the second voltage value set by the charging voltage setting means when the continuous light emission mode is set. A strobe continuous shooting camera, comprising: a light emission amount control means for controlling the light emission amount of the strobe by discharging each strobe. 3. A strobe continuous-shooting camera capable of continuously striking a strobe for continuous shooting, and mode switching means for switching to a single-flash mode or a continuous-flash mode depending on whether or not the strobe is used during continuous shooting. When the mode switching means is switched to the single light emission mode, the charging voltage of the capacitor is set to the first voltage, and when switched to the continuous light emission mode, the voltage of the capacitor is set to be higher than the first voltage. The discharge voltage is set to a high second voltage and is set by the discharge voltage setting means for determining a discharge voltage for one time based on the exposure value determined by the camera and the second voltage value. A strobe continuous shooting camera comprising: a charging voltage control unit that controls a charging voltage of a capacitor based on a voltage.