JPH019941Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a strobe device, and more specifically to a strobe device used in a camera.

Conventionally, strobe devices used in cameras include:
There are ordinary strobe devices that emit flash light in conjunction with the opening and closing operations of the shutter, and auto strobe devices that automatically and appropriately control the amount of flash light (hereinafter simply referred to as strobe devices). , at least a flashlight discharge tube (hereinafter referred to as
It has a built-in flash tube (referred to as a flash tube) and an electric circuit for emitting light.

By the way, in addition to the above-mentioned general strobe devices, strobe devices include close-up strobe devices that have a ring-shaped flash tube and are detachably attached to the front end of a camera lens barrel. Like the general strobe device mentioned above, this close-up strobe device is composed of a flash tube and a light emitting electric circuit.
In general, the flashlight emitting tube and its electric circuit for emitting light are often constructed separately, but if this is used, the flashlight emitting device consisting of the flashlight emitting tube and the electric circuit for emitting light are built-in. A controlled control box must be used.

Comparing this close-up strobe device and a normal general-purpose strobe device in terms of their configurations, as mentioned above, both have a flash tube and a light emitting electric circuit, and it depends on whether they are integrated or separate. They are just different. This means that if a user who owns a strobe device for general photography purchases a strobe device for close-up photography, he or she will have to purchase the same electric circuit for emitting light, creating a double burden for the user. Become.

The purpose of the present invention is to provide a changeover switch so that the light emitting electric circuit of a general-purpose strobe device can also be used for the light emitting electric circuit of a close-up strobe device, in order to eliminate the unnecessary drawbacks mentioned above. ,
It is an object of the present invention to provide a strobe device in which a light emitting electric circuit is connected as an electric circuit of a close-up strobe device by the switching operation of this switch.

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, a general strobe device 2 as a general purpose strobe device is detachably attached to the upper surface of a camera body 1. As shown in FIG. This strobe device 2
is a series control type auto strobe, and the front of its housing 2a is a light-emitting surface 2b, and a flash tube FL is arranged in the housing 2a corresponding to this light-emitting surface 2b. Furthermore, a light emitting electric circuit is built inside.

As is well known, series controlled auto strobes are
The light emission of the flash tube is appropriately controlled by a stop signal from the received light amount control circuit. That is,
The flash tube emits synchronized light by closing the camera's X contact, and the reflected light from the subject is received by the received light amount control circuit. A stop signal issued from the circuit activates the auxiliary discharge tube to stop the flash tube from emitting light.

Next, an example of the electrical circuit of the main parts of this series control type auto strobe will be explained with reference to Fig. 3.
The main capacitor C ₀ is connected to both ends E ₁ and E ₂ of a power supply (not shown). A flash tube FL and a thyristor SR are connected in series to both ends of this main capacitor C ₀ via a coil L. A resistor R ₁ is connected in parallel to the thyristor SR, and a diode D ₁ is connected to the coil L.
are connected in parallel. In addition, an X contact operating circuit _X0 is connected to both ends of the main capacitor _C0 through a coil L, and a trigger transformer T is connected to the output end of the circuit through a trigger capacitor _C1 . 2 of the same transformer
Next coil T ₁ is the trigger electrode for the flash tube FL.
Connected to FT.

Further, a resistor _R2 is connected between the gate and cathode of the thyristor SR, and the gate is further connected to the thyristor drive circuit _Y0 .
This thyristor drive circuit Y ₀ is operated by the output signal of the X contact operating circuit X ₀ and serves to fire the gate of the thyristor SR.

Furthermore, at both ends of the above main capacitor C ₀ ,
The auxiliary discharge tube BL and the received light amount control circuit LC are connected through the coil L and the diode _D2 . A commutation capacitor _C2 is connected between the connection point of the diode _D2 and the auxiliary discharge tube BL and the anode of the thyristor SR. Further, a light emission stop signal is applied to the trigger electrode BT of the auxiliary discharge tube BL from the light reception amount control circuit LC through the trigger transformer TT.

The light emitting electric circuit configured in this manner is incorporated into the housing 2a to form a series control type autostroboscopic device 2.

The strobe device 2 includes a connecting portion 3 for coupling an external light emitter, and a connecting portion 3 disposed near the connecting portion 3 for connecting a light emitting electric circuit to the external light emitter, that is, the close-up strobe device. changeover switch S
and is provided.

As shown in FIG. 1, the connection part 3 is composed of a coupling socket 4 provided on the lower front part 2c of the housing 2a of the strobe device 2, and a connection socket 4 for the close-up strobe device 5 is provided in the socket. The plug 6 is designed to be inserted.

Then, as shown in Fig. 2, the changeover switch S
is arranged near the socket 4 in the housing 2a, and the tip of the movable switching contact Sa of the switch S is connected to an opening window 4d provided in a part of the inner wall of the socket 4. It penetrates through and extends into the socket 4.

Further, the close-up strobe device 5 is constituted by a ring strobe, and is connected to the electric circuit of the strobe device 2 through an electric cord 7 and the plug 6. This plug 6 has three coupling pins 6a, 6b, 6c, and these pins 6
When the plug 6 is inserted into the socket 4, the three connecting terminals 4a and 4 in the socket 4 are connected to each other.
b and 4c, respectively, and are electrically connected.

The three coupling terminals 4a to 4c and the changeover switch S are connected to the light emitting electric circuit as shown in FIGS. 2 and 3. That is, the coupling terminal 4a is connected to one fixed contact terminal Sb of the changeover switch S, the coupling terminal 4b is connected to the negative terminal _E2 of the power source of the electric circuit for light emission, and the connection terminal 4c is connected to the positive terminal of the power source of the electric circuit for light emission. The movable switching contact Sa of the switching switch S is connected to E ₁ respectively.
The secondary coil _T1 of the trigger transformer T in the light emitting electric circuit and the other fixed contact terminal Sc of the switch S are connected to the trigger electrode FT of the flash tube FL in the light emitting electric circuit. ing.

In the changeover switch S, the switching movable contact piece Sa is normally in contact with the other fixed contact piece terminal Sc. That is, when the plug 6 is not inserted into the socket 4, the movable contact piece Sa and the other fixed contact piece terminal Sc are in contact with each other, and in this state, as shown in FIG. The secondary coil T ₁ of T is connected to the trigger electrode FT of the flash tube FL. Therefore, when the plug 6 is not inserted, the flash device 2 operates as an auto flash.

In a strobe device configured in this way, when the camera's X contact closes, the flash tube
When FL and thyristor SR are triggered and thyristor SR becomes conductive, discharge tube FL emits light. The reflected light from the subject due to this light emission is received by the received light amount control circuit LC, and when the received light amount reaches the appropriate light amount, a stop signal is generated from the circuit. This stop signal is applied to the trigger electrode BT through the trigger transformer TT, so the auxiliary discharge tube BL becomes conductive, and the potential of the commutation capacitor _C2 is applied between the cathode and anode of the thyristor SR, making the thyristor SR non-conductive. By doing so, the flash light bulb FL stops emitting light.

In addition, after the thyristor SR is cut off, the auxiliary discharge tube BL is connected to the commutation capacitor _C2 ,
A charging current is passed in the opposite direction to that before cut-off, and when the current drops below the holding current, the arc tube FL
completely stops emitting light. Then, when the arc tube FL completely stops, the commutation capacitor _C2 is charged in the opposite direction again.

In addition, when using a strobe for close-up photography, attach it to the outer periphery of the photographic lens, and attach it to the plug 6.
into the socket 4 provided on the lower front part 2c of the strobe device 2. When the plug 6 is inserted into the socket 4, the movable contact piece Sa of the changeover switch S is pushed by the front part of the plug 6.
The contact piece switches, moves away from the other fixed contact piece terminal Sc, and comes into contact with one fixed contact piece terminal Sb.
When this is switched, the electrical connection between the secondary coil _T1 of the trigger transformer T and the trigger electrode FT of the flash tube FL in the electric circuit for light emission is cut off.
The secondary coil T ₁ of the trigger transformer T is connected to a trigger electrode (not shown) of a flash tube of the special strobe device 5 .

Therefore, in this state, when the X contact of the camera is closed, the light emitting electric circuit is activated and the close-up strobe device 5 emits light. At this time, the flash tube FL of the strobe device 2 is not triggered, so
It does not emit light.

According to the above embodiment, the changeover switch for connecting the light emitting electric circuit of the strobe device to the close-up strobe device is automatically switched by the connecting operation of the plug of the close-up strobe device. Therefore, there is no need to manually change the switch. Moreover, the changeover switch is inserted into the trigger circuit, which has the least burden on the light-emitting electric circuit, and changes the voltage application to the trigger electrode, so a changeover switch with a relatively simple structure can be used. , the manufacturing cost can be reduced accordingly.

In the above embodiment, the present invention was applied to an auto strobe, but it goes without saying that the present invention can be similarly applied to a general strobe device.

Further, in the above embodiment, the changeover switch is automatically switched by the plug connection operation of the close-up strobe device, but this may be due to the connection operation of the close-up strobe device to the camera, or a completely different operation. Of course, the switching may be performed manually.

In this way, the present invention allows the light emitting electric circuit of a general-purpose strobe device to be used as the light emitting electric circuit of a close-up strobe device by skillfully using a changeover switch. Since the device can be constructed only from a flashlight emitting tube and there is no need to provide an electric circuit for emitting light, the burden on the user can be greatly reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a strobe device showing an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of the main parts of the strobe device of the present invention, and Fig. 3 is a strobe device to which the present invention is applied. FIG. 2 is a diagram of a main part of a light emitting electric circuit. FL...Flashlight discharge tube, 1...Camera body,
2...General-purpose strobe device, 3...Connection part, 5...
Close-up strobe device, S... switch.

Claims (1)

[Claims for Utility Model Registration] A flashlight discharge tube, a trigger electrode, a trigger circuit for applying a trigger voltage to the trigger electrode, and a light emission electric circuit including a main capacitor connected in parallel to the discharge tube. It has a general-purpose strobe device that is detachably attached to the camera's accessory shoe, a ring-shaped flash discharge tube, and a trigger electrode, and is detachably attached to the front end of the camera's lens barrel. A close-up strobe device and a flash discharge tube of this close-up strobe device are connected in parallel to the main capacitor in the general-purpose strobe device, and a trigger electrode of the close-up strobe device is connected to a trigger circuit in the general-purpose strobe device. a connection means provided in the general-purpose strobe device, when the close-up strobe device and the general-purpose strobe device are connected by the connection means, the trigger circuit of the general-purpose strobe device and the trigger electrode of the flash discharge tube of the general-purpose strobe device; A strobe device characterized by comprising: a switch for cutting off connection with the flash device;