JPS5947440B2 - Flashlight with two lights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flash device used as a light source for photography, and more particularly to a two-lamp flash device having two light emitting parts.

Lighting is the most important thing when taking pictures.

When photographing using an artificial light source, it is not possible to obtain good photographs simply by shining light on the subject from the front. Therefore, professional photographers use multiple light sources for lighting. Amateurs cannot use many light emitters, so they usually shoot with just one light. Therefore, it is not possible to obtain very good photographs.

Recently, automatic flash devices have appeared that can automatically control the amount of light emitted by the flash device, and even amateurs can now easily perform bounce lighting. In the case of bounce lighting, you can get a photo with a lot of light going around. Although it is possible to obtain better photographs than by directly illuminating the subject, it is not as good as multi-flash lighting.Therefore, recently, two-lamp flash units have appeared that have two light-emitting parts in one case. At least one of the lamps is rotatable so that bounce printer ink can be produced. In other words, it is possible to perform multi-flash lighting, including bounce lighting and direct lighting, with a single flash unit, making it possible to obtain good photographs. Since it is for amateur use, it is usually an automatic flash device. This conventional two-lamp automatic flasher fires and stops at the same time, just like a single flash. The light emission ratio is fixed at about 6 for bounce light and 4 for direct light. However, in actual use, direct light is slightly more visible than expected.

Also, the ratio will differ slightly depending on the location where the photo is taken. The object of the present invention is to provide a two-lamp automatic flash device that prevents such drawbacks.

Therefore, in the present invention, instead of making the two lights emit light at the same time, the one that can bounce is made to emit light first, and when it reaches a certain brightness, it stops emitting light, and then the other light emitting parts are made to emit light to meet the shooting conditions. The system is designed to stop emitting light when the optimum condition is reached. The illustrated embodiment will be described below. A first discharging capacitor 1 and a second discharging capacitor 2 are connected to be charged from a power source 3 via diodes 4 and 5. A first discharge tube 6 is connected in parallel to the first discharge capacitor 1 . This discharge tube 6 and a reflecting mirror (not shown) constitute a first light emitting section. A second discharge tube 7 is connected in parallel to the second discharge capacitor 2.
The circuit for starting the discharge of the first discharge tube 6 is a conventional trigger.
It can be exactly the same as the circuit, the first trigger capacitor 8
, a first trigger transformer 9, and a synchro contact 10. The circuit for starting the discharge of the second discharge tube 7 is as follows:
The second trigger capacitor 11, the second trigger transformer 12, and the SCR13 are connected, and the second discharge tube 7 is operated by the operation of the SCR13. This SCR
13 is for stopping the discharge of the first discharge tube 6, as will be described later. Therefore, the second discharge tube 7 is started to discharge at the same time as the first discharge tube 6 is stopped.

The quench tube 14 connected in parallel to the first discharge tube 6 bypasses the electric charge of the first discharge capacitor 1 to stop the discharge of the first discharge tube 1. The SCR13 operates the first quench pipe 1. That is, the SCR13 operates to discharge the second discharge tube 7 and the first quench tube 14 simultaneously. The second quench tube 15 is also used to stop the discharge of the second discharge tube 7, and is used to stop the discharge of the second discharge tube 7.
Discharge is started at l6. The SCR13 and 36 are operated by a photometric circuit shown in FIG. This photometric circuit is energized by the Zener diode 17, which is adapted to generate a Zener voltage by the discharge of the first discharge tube 6 and the second discharge tube 7, and starts operating. It has an optical integration circuit including a phototransistor 18 that receives reflected light from a subject and converts it into an electrical signal, and an integrating capacitor 19, and includes an integrating capacitor 19 and a variable resistor 2.
0, and a second comparison circuit 24 connected between an integrating capacitor 19, a resistor 23, and a variable resistor 20. variable resistance 2
5, the resistor 23, and the variable resistor 20 are connected in series, and a voltage is applied from the Zener diode 17. The output of the first comparator circuit 22 is output when the integrated value of the integrating capacitor 19 reaches the first output level determined by the sliding piece 21 of the variable resistor 20, and the output of the second comparator circuit 24 is It is output when the integral value of the integrating capacitor 19 reaches the second output level, which is the optimum value for photographing. SCRl3 is operated by the output of the first comparison circuit 22, and SCRlq is operated by the output of the second comparison circuit 24. The variable resistor 25 is for adjusting both the first output level and the second output level simultaneously, and the variable resistor 20 is for controlling the first output level. The first output level can be changed from O to the second output level depending on the position of the sliding piece 21. In other words, it is possible to change the level from a level where the first discharge tube 6 is turned off almost simultaneously with the emission of light to a level where an appropriate exposure value is obtained only by this. The operation of the illustrated embodiment will be explained below.

When the first discharging capacitor 1 and the second discharging capacitor 2 are charged from the power source 3, they are ready to emit light. When the shutter of the camera (not shown) is then turned off, the synchro contact 10 closes. The first trigger capacitor 8 is discharged, and the first discharge tube 6 is discharged. This discharge causes Zener diode 1
A voltage is generated at 7, and the photometry circuit starts operating. Therefore, the reflected light from the object is received and integrated by the integrating circuit. When the integrating capacitor 19 reaches the first output level, the SCR13 operates, operating the quench tube 14, discharging the second trigger capacitor 11, and discharging the second discharge tube 7. The operation of the quench tube 14 causes the first discharge tube 6 to stop discharging. After the object is illuminated by the discharge from the first discharge tube 6, it is further illuminated by the second discharge tube 7. The photometry circuit further continues photometry and operates SCR16 when the second output level is reached. The quench tube 15 is operated by the operation of the SCR16, and the discharge of the second discharge tube 7 is stopped. As described above, in the present invention, first, the first discharge tube 6 discharges and emits light, stops emitting light at the first output level of the photometry circuit, and further illuminates the subject with the second discharge tube 7 that emits light almost simultaneously. Then, when the second output level is reached, the second discharge tube also stops emitting light.

The first output level can be changed, but if we set the second output level to 6 when the second output level is 10, the amount of light emitted from the first discharge tube 6 will stop at 6, and the remaining 4 will be the second output level. This is covered by the light emitted from the discharge tube 7. Since the output of the photometry circuit is set in two ways so that the light emitting parts emit light separately, if the first light emitting part is set to bounce, no matter what the reflection conditions on the ceiling are, no matter what the distance to the ceiling is. However, the proportion of bounced light can always be kept constant. Conventionally, lights were emitted at the same time and stopped at the same time, so depending on the reflection conditions of the ceiling or the distance to the ceiling,
Although the ratio of bounced light was different, according to the present invention,
As mentioned above, it can always be kept constant. Further, if the second output level is made variable as in this embodiment, the ratio can be changed as desired.

[Brief explanation of the drawing]

The figures relate to an embodiment of the present invention; FIG. 1 is a circuit diagram excluding a photometric circuit, and FIG. 2 is a circuit diagram of the photometric circuit. 1... First discharge capacitor, 2...
... Second discharge capacitor, 6 ... First discharge tube, 7 ... Second discharge tube, 17 ... Zener diode, 13, 16 ...・SCR)
18...Phototransistor, 19...
- Integral condenser.

Claims (1)

[Claims] 1. A first light emitting section that is rotatably attached and capable of bouncing; and 2.
a photometric circuit that outputs an output signal based on a value; a first light emission stopping means that stops the light emission of the first light emitting section at the output of the first output level of the photometry circuit; A flashlight emitting device characterized by having a second light emitting section that emits light afterward, and a second light emitting stop means that stops emitting light from the second light emitting section at the output of the second output level of the photometry circuit.