JPH01296229A - Camera with stroboscopic device - Google Patents

Abstract

PURPOSE:To effectively shorten the waiting time for a stroboscopic device charging completion by providing a changing means which changes charging current to height current in response to the operation stop of an operation device. CONSTITUTION:When a film feeder 14 is stopped, mode is shifted from a first mode to a second mode, a switch 50 is closed at the trailing edge of a signal which indicates that a film is being fed, and both ends of a resistance 44 are shorted. Therefore, the base current of a transistor 43 and corrector current become heavier than those in the first mode, and a main condenser 30 is rapidly charged. Thus, the waiting time for the subsequent shot is shortened during the operation which discharges the film to the outside of the camera immediately after one shot photographing is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camera equipped with a strobe device that incorporates a strobe device or is connected to a strobe device.

(Prior art) Many strobe devices built into or connected to cameras are
A battery (e.g., DC6V) is used as a power source, and the power extracted from the battery is boosted (e.g., 300 V) by a DC-DC converter, and then charged into the main capacitor (e.g., 180 μF), and this charged energy is discharged. It is configured to emit flash light by flowing it all at once through a tube.

When charging the main capacitor mentioned above, the battery outputs as much power as it can, so the operating devices (
For example, it may not be possible to supply enough power to the actuating device (for example, a film transport device, a shutter driving device, etc.) to enable the actuating device to operate normally. For this reason, while the strobe device is being charged, the operation of the actuating device such as the film transport device is stopped (for example, see Japanese Patent Laid-Open No. 50-97327).

(Problem to be Solved by the Invention) As described above, by creating a sequence in which charging the strobe device and operating the actuating device do not occur at the same time, charging the strobe device may cause the actuating device to not operate normally. This can be prevented.

Even if the above is a self-sequence, there is little problem if you only take one shot with the camera, but if you use a strobe device to take several shots in succession, you will need to wait until the strobe is fully charged after taking one shot. If it takes a long time to fully charge the flash, you may miss an important photo opportunity, or it may become very frustrating.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a camera with a strobe device that shortens the waiting time until charging of the strobe device is completed without adversely affecting the operation of the camera's operating device. It is.

(Means for Solving the Problems) A camera with a strobe device of the present invention includes a main capacitor, a charging circuit that charges the main capacitor,
A light emitting unit that emits flash light by discharging electric power stored in a main capacitor, a strobe device built into or connected to the camera, and an actuating device other than the strobe device, and both the strobe device and the actuating device. a first mode in which power is supplied to these two devices simultaneously from a power source that supplies power to the strobe device; and a second mode in which power is supplied to the strobe device from the power source and no power is supplied to the actuating device. , comprising a switching means for switching the charging current to a high current in response to the stoppage of the actuating device so that the charging current in the second mode is higher than the charging current of the main capacitor in the first mode; It is characterized by:

Here, since the main load for the charging circuit is the main capacitor, as the main capacitor is charged, the equivalent load for the charging circuit changes greatly. Therefore, the above statement "so that the charging current in the second mode is higher than the charging current of the main capacitor in the first mode" means that the equivalent load seen from the charging circuit to the main capacitor side has changed significantly. It is not necessary that the charging current in the second mode is always higher than the charging current in the first mode in all cases, and the average current in each of the first mode and the second mode has the above relationship. It is sufficient if Specifically, the above-mentioned charging circuit is one that supplies a substantially constant current over time (however, changes in current value due to large fluctuations in the equivalent load are allowed) to the load, or one that supplies a constant current per unit time. This includes those that supply approximately constant power to a load.

In the camera with a strobe device, the charging circuit includes:
For example, a step-up circuit using a flyback transformer is provided, and the switching means is configured to switch the current value of the primary 71S flow flowing into the flyback transformer.

Further, the actuation device is, for example, when the camera is a camera that photographs and records images on a photographic material built into the camera, and which transports the photographic material built into the camera within the camera, or , refers to a conveying device for conveying from inside the camera to outside the camera, that is, an electromagnetic device that performs mechanical operation by operating a motor, solenoid, etc., for example.

Furthermore, the above power source does not include a commercial power source from which the camera can draw almost unlimited power, but refers to a power source that has a limit on the power that can be drawn per unit time, such as a battery built into the camera.

(Function) The camera with a strobe device of the present invention corresponds to the stoppage of the actuating device so that the charging current in the second mode is higher than the charging current of the main capacitor in the first mode. Since it is equipped with a switching means for switching the charging current to a high current, even when the actuating device (for example, film transport device) is in operation (for example, during film transport), the current is high enough to cause no problem in the operation of the actuating device (for example, film transport device). Electric power is drawn from the power source to charge the main capacitor, and after the actuating device stops operating (for example, after film transport is complete), all the power that can be drawn from the power source is diverted to charging, so that the actuating device is not activated. Compared to the case where charging is not performed while the camera is in use, the waiting time until charging is completed is reduced, making it easier to take continuous pictures and reducing missed photo opportunities.

Further, in the camera with a strobe device, a step-up circuit using a flyback transformer is adopted as the charging circuit, and the switching means is configured to switch the current value of the primary current flowing into the flyback transformer. Therefore, it is possible to have a relatively simple circuit configuration, and the camera with a strobe device of the present invention can be made inexpensive, compact, and highly reliable.

Further, the above-mentioned actuation device is not limited to a specific device among devices built into the camera or connected to the camera other than a strobe device, (a film feeding device that winds and unwinds regular photographic film wound inside the cartridge inside the camera; an instant camera that takes instant photographs, ejecting the photographed instant photographic film outside the camera) By combining a strobe device (e.g. a discharging device) with the strobe device, the waiting time until charging of the strobe device is completed can be further effectively shortened.

(Example) Examples of the present invention will be described below with reference to the drawings.

FIG. 3 is a front view showing an example of the external shape of the camera.

A photographic lens 2 is provided approximately at the center of the camera 1,
Light incident from the photographic lens 2 reaches a photographic film (not shown) via a shutter (not shown), and an image of the subject is photographed and recorded on the photographic film. A photometric window 3 is provided on the left side of the photographic lens 2. Light incident through the photometric window 3 is received by a photosensor (not shown), and exposure is controlled according to the amount of incident light. A finder 4 is provided at the upper right of the photographic lens 2, through which a subject can be observed. On the left side of the finder 4, a light emitting section 5a and a light receiving section 5b of a so-called active automatic focus adjustment device are provided. 5b receives the light, the distance to the object is determined by the principle of triangulation, and the photographing lens 2 moves on the optical axis of the lens according to the determined distance. Further, a light emitting section 6 of a strobe device is provided at the upper left end of the figure. When the shutter button 7 is pressed, a shutter (not shown) is operated, and in synchronization with the operation of the shutter, strobe light is emitted from the light emitting section 6 toward the subject. A self-timer switch 8 is provided below the light emitting section 6, and when the switch 8 is turned on and the shutter button 7 is pressed, self-timer photography is performed.

An exposure adjustment slide switch 9 is provided above the metering section 3 to finely adjust the exposure. If you slide this switch 9 left or right to take a picture, the overall photo may look pale or pale depending on the photographer's preference. It is possible to obtain a dark photograph as a whole. The camera 1 in this embodiment is an instant camera that takes instant photographs, and immediately after photography is completed, a sheet of instant photographic film (not shown) that is built into the camera 1 and has been photographed is transferred to the camera by a film transport device. is discharged from the top of the camera to the outside of the camera. Further, this camera 1 has a built-in battery (not shown), and power is supplied from this battery to various devices in the camera 1 such as a flash device and a film transport device.

FIG. 4 is a power system diagram showing an outline of the power supply system for each device built into the camera shown in FIG.

The battery 10 is connected to a flash device 11, an exposure control device I2 that controls exposure based on light incident from a photometry window 3 (see FIG. 3), and the slide position of a slide switch 9 (see FIG. 3), and a camera 1. An automatic focus adjustment device 13 that fixes the distance to the subject 4-1, a film transport device 14 that discharges the film after shooting out of the camera, and a camera 1
Sequence control device 1 that controls the overall order of operations, etc.
5, and supplies power for each of these devices to operate.

FIG. 5A is a circuit diagram schematically showing the circuit of the film transport device 14 of FIG. 4, and FIG. 5B is a timing chart thereof.

A shutter close signal S1 indicating the moment when the shutter closes at time A is manually supplied to the monostable multivibrator 141 from the exposure control device 12 in FIG. From the monostable multi-by-break 141, a micro switch 142, which will be described later, is connected.
A pulse signal SL' which falls after the signal S1' outputted from the circuit rises is output. This pulse signal 81
' is input to the OR circuit 143 from the input terminal 143a of the OR circuit 143.

The microswitch 142 has a contact point [42a is electrically m+a(
(See FIG. 4), and the contact 142b is grounded (connected to the ~ side of the battery 10). Contact 142
c is connected to the input terminal 143b of the OR circuit +43. This microswitch 142 is engaged with a cam 147 that rotates once in conjunction with the rotation of the film transport motor 14B from the start of film transport until the end of ejecting the film out of the camera. As shown in the figure, the switch switching arm 142d of the microswitch 142 is connected to the cam 1.
47, the contacts 142b and 142c are connected, and when the cam 147 rotates and the switch switching arm 142d is pushed upward in the figure,
Contact 142b is opened and contacts 142a and 142c
is connected.

As will be described later, when the film transport motor 146 starts rotating in response to the output signal 81' from the monostable multivibrator 141, the cam 147 also rotates, and the switch switching arm 142d of the microswitch 142 switches before the output signal 81' falls. Pushed up contact 142a and contact 14
2c is connected, and the signal S' is output from the microswitch. Therefore, the film conveyance signal Sz, which is the output signal of the OR circuit, is a continuous signal from the time when the shirt shutter close signal S1 is manually applied to the time when the cam 147 completes one rotation (the end of film ejection), as shown in FIG. 5B. Become.

The output terminal 143c of the OR circuit 143 is connected to the base 144b of the NPN l-transistor 144. Emitter 144C of transistor 144 is grounded.

Collector 144a of transistor 144 and + of battery 10
A coil 145d of a relay 145 is connected between the two sides. A contact 145a of the relay 145 is connected to the + side of the battery 10, and a contact 145b is grounded. Further, the contact 145c is grounded via the film transport motor 146.

When the film conveyance signal S2 is applied to the base 144b of the transistor 144, the coil 145d of the relay 145
is energized, contacts 145a and 145c are connected, and motor 14B rotates. When the film discharge is completed and the signal 81' from the microswitch 142 falls, the current to the coil 145d of the relay 145 is cut off, and the contact 145b of the relay 145 and the contact 145
c is connected, and the motor 146 is stopped.

The film transporting signal S2 is the NPN t-transistor 1.
It is also input to the base 149b of No. 49. transistor 1
The emitter 149c of 49 is grounded, and the collector 1
49a is the battery 1 via the coil 148d of the relay 148.
Connected to the + side of 0. While the film transport signal S2 is at H level (between time A and time B in FIG. 5B), the coil 148d of the relay 148 is energized, and the switch 50 (contact of the relay 148) of the strobe circuit, which will be described later, is in an open state. As a result, the switch 50 shifts to the closed state in response to the stoppage of the film transport device 14.

FIG. 1 is a circuit diagram showing an embodiment of a strobe circuit built into the strobe device 11 shown in FIG. 4. FIG.

This strobe circuit 20 includes a main capacitor 30, a charging circuit 40 that charges the main capacitor 30, and a main capacitor 30.
A light emitting unit 60 that emits the electrical power charged to 0 and generates a flash.
It is made up of. The charging circuit 40 also converts the DC power supplied from the battery IO into AC power, passes through a flyback transformer 41, and converts it back into DC power through a diode 42 to charge the main capacitor 30.
It consists of a C converter 40a and an oscillation stop circuit 40b that detects that the voltage across the main capacitor 30 has reached a predetermined value (for example, 300) and stops the oscillation of the DC-DC converter 4 (la). .

The flyback transformer 41 is a transformer designed using the distributed capacitance and leakage inductance of the secondary winding 41C, and is mainly used in television receivers to create a DC voltage at the anode of the cathode ray tube. be.

A capacitor 16 is connected to both ends of the battery 10 to stabilize the voltage, and then power is supplied to the strobe circuit 20 via the main switch 17.

Here, first, the configuration of the charging circuit 40 will be explained.

One end a of the winding 41a of the flyback transformer 41 is connected to the + side 10a of the battery 10 via the main switch 17 (hereinafter simply referred to as "connected to the battery IO"), and the other end C is NPN) Collector 43a of transistor 43
is connected to. Emitter 43c of transistor 43
is connected to one side 10b of the battery 10 (hereinafter referred to as "grounding"; the unfixed point connected to one side of the battery 10 is referred to as a grounding point e). One end 44a of the resistor 44 is connected to the battery IO, and the other end 44b is connected to the base 43b of the transistor 43 via a resistor 45, a winding 41b of the flyback transformer 4, and a resistor 46. A capacitor 47 is connected between a connection point d between the resistor 45 and the winding 41b and a ground point e. A resistor 48 and a resistor 49 are connected to both ends of the battery 10 in order from the + side 10a of the battery IO.
, switches 50 are connected in series. A base 51b of a PNP transistor 51 is connected to a connection point r between the resistor 48 and the resistor 49. The emitter 51c of the transistor 51 is connected to the battery IO. transistor 5
The collector 51a of the resistor 44 is connected to the other end 44b of the resistor 44. Secondary winding 4 of flyback transformer 41
One end g of 1c is connected to the anode 42a of the diode 42, and the cathode 42b of the diode 42 is connected to the + side 30a of the main capacitor 30. Main capacitor 3
One side 30b of 0 is grounded. The above secondary winding 41c
The other end is connected to the emitter 52c of the NPN transistor 52. A collector 52a of the transistor 52 is connected to a base 43b of the transistor 43. The base 52b of the transistor 52 is grounded.

A resistor 53 and a variable resistor 54 are connected in series between the cathode side 42b of the diode 42 and the ground point e, and an intermediate terminal 54c of the variable resistor 54 is connected to the + side input terminal 5 of the comparator 55.
5a. One side input terminal 55 of comparator 55
Anode 56a of light emitting diode 56 and one end 57a of resistor 57 are connected to b. A cathode 56b of the light emitting diode 56 is grounded. The other end 57 of the resistor 57
b is connected to battery lO. Here, the light emitting diode 56 plays the role of applying a predetermined constant voltage to the one side input terminal 55b of the comparator 55 by utilizing the potential difference generated at the PN junction of the light emitting diode 56. Comparator 55
The output terminal 55c of is connected to the base 59b of an NPN transistor 59 via a resistor 58. A collector 59a of the transistor 59 is connected to a base 43b of the transistor 43.

Emitter 59c of transistor 59 is grounded.

Next, the configuration of the light emitting section 60 will be explained.

A resistor B1 is installed at both ends 30a and 30b of the main capacitor 30.
and neon tube 6B are connected in series. Further, a flash discharge tube B2 is connected to both ends of the main capacitor 30. One end 63a of the resistor 63 is connected to the + side 30 of the main capacitor 30.
connected to a. The other end 63b of the resistor 63 is connected to one end l of the primary winding 85a of the transformer 65 via a capacitor 64. The other end j of the primary winding 1IB5a is grounded together with one end of the secondary winding 65b.

The other end 1 of the secondary winding B5b is connected to the trigger electrode 62a of the flash discharge tube 62. The other end B3b of the resistor 63
An X contact 70 is connected between the camera and the ground point e, and the contact closes at the timing to emit light from the strobe in conjunction with the operation of the shutter of the camera.

Next, the circuit operation of the strobe circuit 20 configured as described above will be explained.

The switch 50 supplies power to the strobe circuit 20 from the battery 1O, and also serves as a film transport device 14 (FIG. 5A), which is an example of an actuating device in the present invention and discharges the film contained in the camera to the outside of the camera.

In the first mode, in which power is simultaneously supplied to the capacitor (see FIG. 5B), the capacitor 30 is opened and the main capacitor 30 is charged with a low current as will be described later. When the film transport device 14 stops, the battery 10 supplies power to the strobe circuit 20 and shifts to a second mode in which no power is supplied to the film transport device 14. In this second mode, the switch 50 is closed. As will be described later, the main capacitor 30 is charged with a higher current than in the first mode.

When the switch 50 is open, the voltage of the battery 10 is applied to the base 51b of the transistor 51, and the emitter 51c and collector 51a are in an open state. When switch 50 is closed, resistor 48 and resistor 49
Since a partial voltage determined by the ratio of the resistance value to the resistor 44 is applied to the base 51b of the transistor 51, a current flows from the emitter 51c to the collector 51a, so that both ends of the resistor 44 are short-circuited. Hereinafter, a state in which the switch 50 is open (first mode) will be described.

When the main switch 17 is closed, the resistor 44 and the resistor 4
5, the capacitor 47 is charged, and the voltage at the connection point d between the resistor 45 and the capacitor 47 increases.

When the voltage at the connection point d increases, a base current flows into the transistor 43 via the winding 41b and the resistor 46, and accordingly, a current flows into the collector 43a of the transistor 43 via the winding 41a.

When current flows through the windings 41a and 41b as described above, both ends g of the secondary winding 41c of the flyback transformer 41
, h, a voltage is generated in the direction in which the current flows from one end g to the other end, but the current is blocked by the diode 42 and the current does not flow, and a predetermined amount of energy is accumulated in the secondary winding 41c. be done. Further, the other end of the secondary winding 41c becomes a negative voltage, and a base current flows from the base 52b of the transistor 52, so that the collector 5 of the transistor 52
2a and emitter 52c become short-circuited, lowering the base voltage of transistor 43, and opening between collector 43a and emitter 43c of transistor 43, thereby blocking the current flowing through winding 41a. Winding 4
When the current flowing through 1a is interrupted, an electromotive force is generated in the secondary winding 41c due to the back electromotive force caused by this interruption in a direction that causes the current to flow from the other end to the - end g, and the above-mentioned In this way, the charge stored in the capacitor 47 and the charge flowing from the battery 10 via the resistors 44, 45, 46, etc., flow into the transistor 52 by a predetermined amount of energy stored in the secondary winding 41c. The secondary current flows through the secondary current, and the main capacitor 30 is charged.

When the secondary current flows by the amount of energy stored in the secondary winding 41c, the capacitor 47 is charged again via the resistor 44 and the resistor 45. In this way, the main capacitor 30 is charged via the flyback transformer 41 by repeatedly turning on and off to oscillate.

Note that when the charging circuit 40 in this embodiment stores a predetermined amount of energy in the secondary winding 41c of the flyback transformer 41, the main capacitor 30 is disconnected from the main capacitor 30 by the diode 42. A certain amount of energy is accumulated in the secondary winding 41c, regardless of the charge U (voltage across the main capacitor 30) that has been charged up to that point, and the charge equal to this accumulated energy is transferred at the next moment. Since it is configured to feed into the main capacitor 30,
It acts as a constant power charging circuit that sends a constant amount of power to the main capacitor per unit time.

When the main capacitor 30 reaches a predetermined voltage (for example, 270 V) that allows strobe photography, the neon tube 66 lights up to notify the photographer that it has been charged.

When the main capacitor 30 reaches a so-called fully charged state, the voltage at the input terminal 55a of the comparator 55, which is predetermined by setting the variable resistor 54 to the node A, changes to the light emitting diode 56 applied to the input terminal 55b. This increases the voltage at the output terminal 55c of the comparator 55, increasing the base voltage of the transistor 59 via the resistor 58, shorting the collector 59a and emitter 59c and causing the transistor to 43 is lowered to near ground potential, the oscillation is stopped and main capacitor 30 is prevented from being charged any further.

Also, at the same time as the main capacitor 30 is charged, the resistor 6
3, the capacitor 64 is also charged.

After charging is performed as described above, press the shirt button 7.
When (see FIG. 3) is pressed, the shutter of the camera is operated, and in conjunction with this operation, the X contact 70 is closed. When the X contact 70 is closed, the connection point between the resistor 63 and the capacitor 64 is grounded, so the primary winding 65 of the transformer 65
One end l of a momentarily becomes a negative voltage, and a current flows from the other end j to one end 1. This current generates a high voltage on the secondary side of the transformer 65, and this high voltage is applied to the flash tube 62.
As a result, the charge stored in the main capacitor 30 momentarily flows through the flash discharge tube B2, and a flash (stroboscopic light) is emitted from the flash discharge tube.
is emitted. When a flash is emitted in this way, the voltage across the main capacitor 30 decreases, so the voltage at the + side input terminal 55a of the comparator 55 also decreases, and the output terminal 55c and the base voltage of the transistor 59 also decrease. collector 59a.

The emitter 59c is cut off, and oscillation starts again as described above.

As described above, the switch 50 is open in the first mode (the mode in which power is supplied from the battery IO to both the strobe circuit 20 and the film transport device 14), and the base of the transistor 43 is open. The current is resistance 44
The collector current of the transistor 43 is also limited accordingly, and the amount of power transferred from the battery IO to the main capacitor 30 per unit time is just enough to operate the film transport device 14. limited to.

When the film transport device 14 stops, it shifts from the first mode to the second mode, and as described above, the switch 5 is turned on at the fall of the film transport signal S2 (see FIG. 5A).
0 is closed, and both ends of the resistor 44 are short-circuited, so that the base current and collector current of the transistor 43 are larger than in the first mode.
Main capacitor 30 is rapidly charged.

In this way, immediately after shooting one shot,
Even during the operation of ejecting the film out of the camera, by starting charging to the extent that this operation is not affected, it is possible to reduce the waiting time until the next shot.

As shown in the above embodiment, if a flyback transformer is used in the charging circuit that charges the main capacitor, the primary current flowing into the flyback transformer can be controlled for a unit time using a relatively simple circuit configuration. This is particularly useful because it allows control of the power transferred from the power supply to the main capacitor.

Further, in the above embodiment, the switch 50 is switched using the film transport signal S2 using the circuit configuration shown in FIG. 5A, but the switch 50 is switched by detecting, for example, a change in the current value flowing through the motor 14B. It is also possible to detect the end of film ejection by detecting the end of film ejection, and to switch the switch 50 accordingly (Japanese Patent Laid-Open No. 54-56
(See Japanese Patent Application Laid-open No. 824, and Japanese Patent Application Laid-open No. 52-34718 regarding detection of the end of winding of a conventional photographic film wound in a cartridge.) In addition, the gap between the developing rollers that rotate while holding the film while transporting the film out of the camera is narrow (when there is no film between the rollers).
When the gap between the developing rollers is wide (when the film is between the developing rollers), the switch 50 is closed.
The unfolding roller and the switch 50 may be mechanically interlocked so as to open. As described above, the means for interlocking the operation of the film transport device 14 and the switching of the switch 50 is not limited to a specific means, and can be configured in various ways.

Next, an example of the results of an experiment conducted by the present inventor using the servo circuit 20 and a general film transport device will be shown below.

FIGS. 2A and 2B show that the strobe device is charged when the film transport device and the strobe device are operated independently at different times, and also when the strobe device is charged using the circuit shown in FIG. 1 while the film transport device is operating. The current when
FIG. 3 is a diagram showing an example of a change in voltage over time. The horizontal axis t is the time axis. Further, 11 shown in FIGS. 2A and 2B indicates the magnitude of the primary current flowing from the power source. V,
12 are the main capacitors 30 of the strobe circuit 20, respectively.
and the voltage across 2 flowing into the main capacitor 30
The following current is shown.

Part A shown in FIG. 2A shows the primary current (1) when only the film transport device is operated.

Time t1 from when this film transport device starts operating (time t^) until one film is ejected from the camera
was tl = 2.2 sec. In addition, a portion B shown in FIG. 2A indicates that the strobe circuit is in charge, and immediately after the main switch 17 is closed (at time ta).
), and the voltage V across the main capacitor 30 increases as time passes. The time t2 from the start of charging of the strobe until the voltage V reaches 270 V (the lighting voltage of the neon tube 66) is Lz
-4.8 (seconds). Therefore, if charging is stopped while the film transport device is operating, the time t from when one shot is taken to when the next shot can be taken is t - t, +tz -2, 2 + 4.8 -6.8
(seconds).

On the other hand, if the film transport device is charged to the extent that it does not interfere with its operation while it is operating, the time ti / for one film to be ejected is tl ' as shown in FIG. 2B.
-2,3 (seconds), the time L2' until the voltage V reaches 270V after the film transport device stops is tz'''
3.4 (seconds), and the time t' from when one shot is taken until the next one can be taken is t'" tt
' + tz ' 2.3 +3.4-5.7 (seconds), which is 1.1 seconds shorter than the above t.

In addition, many photographers do not think to take another picture while the already shot film is being transported, so whether or not the photographer feels irritated due to the slow charging of the flash depends on the film being transported. The problem is the length of time from the end of transportation until the timed strobe charging is completed (the neon tube 66 (see FIG. 1) is turned on). Comparing the above data from this point of view, t2' -3,4 (seconds) versus tz-4,8 (seconds)
, which is shortened by tz - t2' wl, 2 (seconds).

In the above embodiment, the film transport device is a device that discharges a sheet of photographic film out of the camera, but the film transport device is a winding device that winds a normal photographic film wound inside a cartridge. Of course, it is also possible to do so.

Further, the actuating device according to the present invention is not limited to a film transport device, and the present invention can be applied to cases in which various other devices that require electric power are operated simultaneously with a strobe device.

Further, the camera with a strobe device of the present invention is similar to a conventional camera (so-called compact camera) that takes pictures on a photosensitive material.
- eye reflex cameras, instant cameras, etc.), but can also be applied to other cameras that do not use photosensitive materials, such as electronic still cameras and video cameras.

(Effects of the Invention) As described above in detail, the camera with a strobe device of the present invention has two modes: a first mode in which power is supplied from the power source to the strobe device and the actuating device at the same time, and a first mode in which power is supplied from the power source to the strobe device. and a second mode in which no power is supplied to the actuating device, and the actuating device is configured such that the charging current in the second mode is higher than the charging current of the main capacitor in the first mode. Since it is equipped with a switching means that switches the charging current to a high current in response to the stoppage of operation, it is possible to shorten the waiting time until charging of the strobe device is completed without adversely affecting the operation of the above-mentioned operating device of the camera. I can do it.

Further, if the charging circuit is provided with a booster circuit using a flyback transformer, and the switching means is configured to switch the current value of the primary current flowing into the flyback transformer, the present invention can be achieved with a relatively simple circuit configuration. Accordingly, the camera with a strobe device of the present invention can be made inexpensive, compact, and highly reliable.

Furthermore, if the film transport device is the actuating device described above, the waiting time can be further effectively shortened.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a strobe circuit built into a strobe device, and FIGS. 2A and 2B are diagrams showing when the film transport device and strobe device are operated independently, and when the film transport device and strobe device are operated independently, respectively. FIG. 3 is a front view showing an example of temporal changes in voltage and current when the transport device and strobe device are operated simultaneously; FIG. 3 is a front view showing an example of the external shape of the camera; FIG. Power system diagram of the camera shown in Figure 3, Figures 5A and 5B
The figures are a circuit diagram showing an outline of the circuit of the film transport device and a timing chart thereof. 1...Camera 2...Photographing lens 3...
・Photometry window 4...Finder 5...Strobe light emitting part 7...Shutter button 10...Battery
14... Film transport device 17... Main switch 20... Strobe circuit 30... Main capacitor 40... Charging circuit 40a -DC-D
C:l:,/Bark 40b...Oscillation stop circuit 41...Flyback transformer 80...Light emitting part 62...Flash discharge tube F0...X contact No. 2A Fig. 5B Fig. A B■
1

Claims (1)

[Claims] A strobe device built into or connected to a camera, which includes a main capacitor, a charging circuit that charges the main capacitor, and a light emitting unit that emits a flash by discharging the power charged in the main capacitor, and the strobe device. a first mode in which power is provided to the strobe device and the actuator at the same time from a power source that supplies power to both the strobe device and the actuator; and a first mode that supplies power to the strobe device from the power source; and a second mode in which no power is supplied to the actuating device, such that the charging current in the second mode is higher than the charging current of the main capacitor in the first mode. ,
A camera with a strobe device, comprising a switching means for switching the charging current to a high current in response to the stoppage of the actuating device.