Claims
- 1. An automatic flashing system, comprising:
- a plurality of flash emitting units each of which includes a first input terminal and a second input terminal;
- first means for supplying an activation signal to the first input terminal of each of said plurality of flash emitting units to have them activated at the same time in response to a trigger signal supplied thereto;
- detecting means for detecting light reflecting from a subject of interest when said plurality of flash emitting units activated to emit flashes, said detecting means supplying a detection signal if a detected value is at least equal to a predetermined reference value corresponding to a proper exposure condition;
- delaying means for delaying activation of said detecting means over a predetermined time period after activation of said plurality of flash units; and
- second means for supplying a deactivation signal; to the second input terminal of each of said plurality of flash emitting units to have them deactivated at the same time in response to said detection signal.
- 2. The system of claim 1 wherein said trigger signal is supplied to said first means when a shutter of camera associated with said system is set in a full open condition.
- 3. The system of claim 1 wherein said second means includes a like plurality of buffer amplifiers each associated with the corresponding one of said plurality of flash emitting units, whereby said detection signal is converted into said deactivation signal when passed through each of said plurality of buffer amplifiers.
- 4. The system of claim 1 wherein said second means includes latching means for latching said deactivation signal before being supplied to each of said plurality of flash emitting means.
- 5. The system of claim 4 wherein said latching means includes a like plurality of flipflops each associated with the corresponding one of said plurality of flash emitting units.
Priority Claims (2)
| Number |
Date |
Country |
Kind |
| 60-102448[U] |
Jul 1985 |
JPX |
|
| 60-108898[U]JPX |
Jul 1985 |
JPX |
|
BACKGROUND OF THE INVENTION
This application is a continuation of application Ser. No. 06/882,354, filed on July 7, 1986, now abandoned.
1. Field of the Invention
This invention generally relates to an automatic flashing system suitable for use in a photographic camera, and, in particular, to an auto-flash photographing system for taking photographs with an automatically controlled flashing operation.
2. Description of the Prior Art
An auto-flash photographic camera is well known in the art, and it has an advantage of allowing to carry out a photographic operation under an optimal exposure condition even in a dark place. However, there is a premise for this advantage in that the amount of light required for auto-flash photography must be equal to or less than the maximum amount of light which can be supplied by a flashbulb of an auto-flashing unit, or the amount of light corresponding to a guide number in a particular setting. For this reason, if the subject to be photographed is located too far away or the stop value is set too large, underexposure will result. It is true that such an undesired situation could be avoided to some extent by moving closer to the subject to be photographed and/or setting the stop smaller in value; however, this would then limit the freedom of flexibility in taking pictures, which is sometimes quite important. In addition, it is not always possible to come closer to the subject of interest, and there are those cases where the stop value cannot be set lower in relation to a particular depth of field and/or depth of focus.
It is therefore a primary object of the present invention to obviate the disadvantages of the prior art as described above and to provide an improved auto-flash photographing system.
Another object of the present invention is to provide an improved auto-flash photographing system capable of insuring an optimal exposure condition for taking photographs at all times.
A further object of the present invention is to provide an improved auto-flash photographing system which carries out a number of flashing operations consecutively for taking a particular photograph so as to insure an optimal exposure condition.
A still further object of the present invention is to provide an improved auto-flash photographing system including a plurality of flash lamps which are controlled suitably to insure an optimal exposure condition.
A still further object of the present invention is to provide an improved auto-flash photographing system which does not impose any limitation in taking photographs even if use is made of an automatic flashing unit.
A still further object of the present invention is to provide an improved auto-flash photographing system reliable in operation.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
US Referenced Citations (9)
Continuations (1)
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Number |
Date |
Country |
| Parent |
882354 |
Jul 1986 |
|
Patent Grant
4897684
