JPS6312337Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a flash discharge tube such as a strobe for photography, and relates to a light emitting device for a flash discharge tube configured to notify the usable status of the strobe and the normal status of the flash discharge tube. be.

Conventionally, a xenon flash discharge tube for photography has generally been a diode discharge tube consisting of two poles, an anode A and a cathode K, as shown in FIG. When the main switch S is turned on, the energy of the power source B is stored in the capacitor C, and when it reaches a predetermined amount, the pilot lamp P lights up to indicate that the light is ready.

The flash discharge tube X is filled with xenon gas, and since the anode and _cathode are separated, no discharge occurs. A current flows through _r , the voltage is increased to a high voltage, and it acts on the external trigger electrode T of the flash discharge tube X, and the xenon gas inside the flash discharge tube An electric discharge occurs instantaneously, causing the light to emit light. However, in the above configuration, it is impossible to determine whether the flash discharge tube X itself is defective or not. If the flash discharge tube X is defective, even if the pilot lamp P indicates that the flash discharge preparation is complete, the flash discharge tube X will not emit light, or even if it does, it will not be able to emit sufficient flash light.

This invention was made in order to solve the above-mentioned conventional drawbacks, and aims to provide a light-emitting device for a flash discharge tube that is configured to be able to detect whether the flash discharge tube is good or not and its lifespan.

Hereinafter, an embodiment according to this invention will be explained in detail based on FIG. 2. In the figure, the charging voltage V _M accumulated in the main flash capacitor C _M from the charging device 1 is the anode A of the xenon flash discharge tube XT,
and is applied to the cathode K. Further, the flash discharge tube XT has an external trigger _T1 installed on the outer wall of the tube. Anode A of the above flash discharge tube XT
To emit the main flash between the external trigger capacitor C2 and the cathode K, the voltage accumulated in the external trigger capacitor _C2 is boosted to a high voltage via the external trigger transformer T _r1 by turning on the switch S _W2 . Light is emitted by applying a voltage to the electrode _T1 .

Also, inside the flash discharge tube XT, there is an internal trigger electrode for auxiliary flash located near the cathode K.
T ₂ is installed as an auxiliary anode.

The voltage accumulated in the auxiliary flash capacitor C ₁ from the charging device 2 is applied to the internal trigger electrode T ₂ via the diode D ₁ , as well as the repeated pulse voltage of several hertz generated by the pulse current generator 3. When the switch _SW1 is turned on, the voltage is boosted to a high voltage by the internal trigger transformer T _r2 and triggered via the diode _D2 .

In addition, the internal trigger electrode in the above embodiment
The repetitive pulse voltage of several hertz is applied to _T2 by applying pulses generated by the pulse current generator 3 by turning on the switch _SW1 . Then, in conjunction with the pilot lamp P that indicates the completion of charging from the charging device 1 of the main flash capacitor C _M , the switch S _W1 is turned on and off by that signal.
It is used to operate. The structure of the pulse current generator 3 is such that the internal trigger capacitor _C3 is charged from the charging device 2 via the auxiliary flash capacitor _C1 and the resistor _R2 , and _SW1 is closed in conjunction with the pilot lamp P. The multivibrator circuit MV is operated by applying a pulse of, for example, 100 to 120Hz to the switch element Q.
Turn on and off.

In the flash discharge tube light emitting device configured as described above, when the main flash capacitor C _M is fully charged and the charging voltage V _M is reached, a pulse from the pulse current generator 3 turns on the switch S _W1 . By connecting the internal trigger electrode of the flash discharge tube XT through the diode _D2 from the internal trigger transformer T _r2
Since the voltage is applied to _T2 , if the flash discharge tube XT is normal, a blinking signal light is generated between the cathode K and the internal trigger electrode _T2 .

Therefore, if the flash discharge tube XT is defective, the electrode T ₂ ,
Since the blinking signal light is not generated between the cathode K or even if it is generated, it is very dark, so it is possible to determine whether the flash discharge tube XT is good or not.

In addition, if a flashing signal is generated between the electrode T ₂ and the cathode K, the auxiliary flash capacitor
Since the capacitance of C ₁ is extremely smaller than that of the main flash capacitor C _M , it not only has almost no effect on the life of the flash discharge tube XT, but also when the camera shutter switch S _W2 is turned on, Since the main discharge is always carried out between the anode A and the cathode K due to the charging voltage V _M of the main flash capacitor C _M , flash errors such as strobe lights do not occur at all.

Furthermore, as mentioned above, the flash discharge tube XT is connected to the anode A by the voltage of the main flash capacitor C _M.
While the discharge is repeated between the cathode K and between the electrode T ₂ and the cathode K, the cathode K on the inner wall of the discharge tube
If blacking occurs in the vicinity due to scattering of cathode material, the blinking signal light becomes darker, which has practical effects such as being able to notify that the flash discharge tube XT is nearing the end of its life.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing a conventional flash light emitting device for a xenon flash discharge tube for photography, and FIG. 2 is an electric circuit diagram showing a light emitting device for a flash discharge tube according to this invention. 1, 2...First and second charging device, 3...Pulse current generator, A...Anode, K...Cathode, C _M ...Capacitor for main flash, C ₁ ... Capacitor for auxiliary flash, C ₂ ...External trigger capacitor, XT...Xenon flash discharge tube, T ₁ ...
External trigger electrode, T ₂ ...Internal trigger electrode,
T _r1 ... External trigger transformer, T _r2 ... Internal trigger transformer, D ₁ , D ₂ ... Diode, S _W1 ,
S _W2 ...Switch, P...Pilot lamp.

Claims (1)

[Scope of utility model registration request] A first charging device and a capacitor for the main flash are connected between the anode and the cathode for the main flash of a xenon flash discharge tube having an external trigger electrode, and an external trigger transformer is connected to the external trigger electrode. An internal trigger electrode to which an internal trigger voltage is applied is provided near the cathode between the anode and the cathode in the discharge tube, and the internal trigger electrode is connected to the secondary side of the internal trigger transformer via a diode, and to the secondary side of the internal trigger transformer via another diode. A flash capacitor is connected to each, a pulse current generator is connected to the primary side of the internal trigger transformer, the capacitance of the auxiliary flash capacitor is made smaller than the capacitor capacity for the main flash, and a second charging device and the A light-emitting device for a flash discharge tube, characterized in that an auxiliary flash capacitor is connected to the main flash capacitor, and a switch of the pulse current generator is operated in conjunction with a pilot lamp installed in parallel with the main flash capacitor to notify the completion of charging. .