JPS6232276Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a camera system equipped with a strobe device and a motor drive device.

2. Description of the Related Art There have conventionally been camera systems in which a motor drive device and a strobe device can be attached to a camera, but in the conventional camera system, the strobe device and the motor drive device are each provided with an independent power source. For this reason, when the strobe device and motor drive device are attached to the camera, the overall size and weight become large and heavy.

Therefore, an object of this invention is to provide a camera system that can operate a strobe device and a motor drive device using a common power source.

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 1, a motor drive device 12 is attached to a camera 11, and a strobe device 13 is attached to this motor drive device 12 by a coupling member, for example, a bracket 14. A power source such as a battery 15 is housed in the strobe device 13 as shown in FIG. 2a. Further, the strobe device 13 is provided with a trigger button 16 for starting the motor drive device and a trigger signal terminal 17 for supplying a trigger signal to the motor drive device 12 in response to a pressing operation of the trigger button. Trigger terminal 17
is connected to a trigger signal input terminal 19 of the motor drive device 12 by a cord 18. A control circuit unit 20 for controlling the motor drive device 12 is built into the bracket 14 (FIGS. 1 and 3a). This control circuit unit 20 is connected to the strobe device by a terminal 21 (FIG. 3b) provided on the end surface 14a of the bracket connected to the strobe device 13 and a terminal 22 (FIG. 2b) provided on the strobe device 13. electrically connected. Further, this control circuit unit 20 includes the motor drive device 1
It is connected to a terminal 23 (FIG. 3c) provided on the end surface 14b of the bracket 14 which is coupled to the bracket 2. The terminal 23 of the bracket 14 is connected to the motor drive device 1.
The control circuit unit 20 is electrically connected to the motor drive device by contacting the terminals 24 (FIGS. 4a and 4b) provided corresponding to the terminals 24 (FIGS. 4a and 4b).

FIG. 5 shows an electric circuit when the motor drive device 12, strobe device 13, and bracket 14 are attached to the camera 11 as shown in FIG. In the strobe device 13, a battery power supply 15 is connected to a strobe power supply circuit 26 via a switching circuit 25. The output of this strobe power supply circuit 26 is connected to a light emitter 27 consisting of a flash discharge tube. A trigger circuit 28 is connected to a trigger electrode (not shown) of the flash discharge tube of the light emitter 27. A strobe power supply circuit 26 and a trigger switching 29 are connected to a gate circuit 30. This gate circuit 3
0 is configured to generate an output signal in response to the completion of charging of the main capacitor included in the strobe power supply circuit 26 and the operation of the trigger switch 29, and its output end is connected to the motor of the control circuit unit 20 built in the bracket 20. It is connected to the drive control circuit 31. This motor drive control circuit is connected to a motor drive circuit 32. This motor drive circuit 32
is connected to the power source 15 and the motor 33 so that the motor 33 of the motor drive device 12 is driven to rotate by the power of the power source 15 of the strobe device 13 in response to a control signal from the motor drive control circuit 31 .
The motor drive control circuit 31 is also connected to the output end of a film winding signal generating circuit 34 which generates a film winding signal in response to the operation of the release mechanism of the camera 11, and responds to the gate output signal and the film winding signal. It is configured to operate. A power supply detection circuit 35 is connected to the motor drive circuit 32 . This power supply detection circuit 35 detects the current flowing into the motor 33, generates an output signal, and controls the switching circuit 25 of the strobe device 13 to open. The synchronization contact (X contact) 36 of the camera 11 is the strobe device 13
is connected to the trigger circuit 28 of.

In the above circuit configuration, when the power source 15 is set, the capacitor of the strobe power source circuit 26 is charged via the switching circuit 25. When charging is completed, a charging completion signal is supplied to the gate circuit 30. In this state, when the trigger button 16 of the strobe device 13 is pressed and the trigger switch 29 is closed, an output signal is generated from the gate circuit 30.
At this time, the release mechanism operates and synchro contact 3
6 is closed. In response to the closing of this synchro contact, the trigger circuit 28 of the strobe device 13 is activated and supplies a trigger signal to the light emitter 27. As a result, the light emitter 27 emits light. On the other hand, when the mirror that has been raised in conjunction with the release mechanism is lowered, the winding signal generating circuit 34 generates a film winding signal in response to the lowering of the mirror. Motor drive control circuit 31
generates a motor drive control signal in response to the film winding signal and the output signal of the gate circuit 30. The motor drive circuit 32 is activated by this control signal, and a drive current is supplied to the motor 33 from the power source of the strobe device 13. This causes the motor 33 to rotate and operate the film winding mechanism. At this time,
The power supply detection circuit 35 detects the drive current of the motor 33, generates an output signal, and opens the switching circuit 25 of the strobe device 13. As a result, the charging current path from the power supply 15 to the strobe power supply circuit 26 is cut off. Therefore, a sufficient driving current is supplied to the motor 33 from the power supply 15, and the motor 33 can obtain sufficient rotational torque. This condition continues as long as current is flowing to the motor. When the film winding is completed, the motor 33
When the drive current is cut off, the power supply detection circuit 35 no longer generates an output signal, and the switching circuit 25 is closed again. Therefore, the strobe power supply circuit 26
A charging current flows from the power supply 15 to the terminal.

As explained above, the power supply that supplies power to the motor drive device is the power supply built into the strobe device, so the strobe device and motor drive device can be operated with one power source, and when both devices are attached to the camera, the overall power is The size and weight of the camera are reduced, and the operability of the camera is improved. In addition, when drive current is supplied from the common power supply to the motor of the motor drive device to operate the film winding mechanism, the charging current path to the capacitor of the strobe device is cut off, so that both the strobe device and the motor drive device are simultaneously supplied with drive current. It is possible to eliminate the problem of not being able to rotate the motor because a sufficient drive current is not supplied to the motor due to the need for power supply. In addition, the motor drive device is configured so that it does not operate unless a signal indicating that the capacitor of the strobe device has been fully charged is supplied, so flash photography will not be taken while charging is incomplete, making it possible to avoid underexposed flash photography. . Furthermore, since the motor drive device, bracket, and strobe device are connected by direct contact points without using a cord, reliability of connection, operability, and design are improved.

In the above embodiment, if the strobe device is not required, the strobe device can be removed from the motor drive device and a power supply device 40 dedicated to the motor drive device can be attached to the motor drive device as shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a front view of a camera system according to an embodiment of the invention, FIGS. 2a and 2b are front and partial side views of a strobe device, FIGS. 3a and 3b.
Figures 3 and 3c are front, side and top views of the bracket, Figures 4a and 4b are side and bottom views of the motor drive device, Figure 5 is a block circuit diagram of the camera system, and Figure 6 is a block diagram of the camera system. FIG. 2 is a front view of the motor drive camera system when no strobe device is attached. 11... Camera, 12... Motor drive device, 13... Strobe device, 14... Bracket, 15... Battery, 16... Trigger button, 20
...Control circuit unit, 21, 22, 23...terminals.

Claims (1)

[Scope of utility model registration request] a camera; configured to be detachably attached to the camera;
a motor drive device that drives a film winding mechanism of the camera; a strobe device that is configured to be detachably attached to the camera and has a built-in power source; a coupling member that detachably connects the strobe device and the motor drive device; provided within the coupling member;
A control circuit unit for controlling the motor drive device; and an electrical path provided in the coupling member for electrically connecting the motor drive device and the power supply in the strobe device to the control unit. A camera system featuring: