JPH01108538A - Multi-lamp light emission stroboscopic photographing device - Google Patents

Abstract

PURPOSE:To obtain a photograph in which a light beam has detoured each part of an object to be photographed containing both a short distance object and a long distance object by placing (n) pieces of electronic flash discharge tubes so that the irradiation center axis is positioned near the outside from the center part corresponding to each of areas which are divided into (n) pieces. CONSTITUTION:The title device is constituted of (n) pieces of photometric circuits 171-174 for executing the photometry of each of object reflected light beams corresponding to each of areas which have divided a photographic picture into (n) pieces. Irradiation angles of flash discharge tubes 151-154 are provided so that the irradiation center axis is positioned near the outside from the center part against each of areas A1-A4, and set so as to supply directly an optical component and a bounce optical component to each of the areas A1-A4. For instance, the irradiation center axis C1-C4 are positioned near the outside from the center part corresponding to each of the areas A1-A4, and also, its each irradiation angle is provided so as to go to about 60 deg.. In such a way, in case of executing stroboscopic photographing of the photographic picture containing both a short distance object and a long distance object, it does not occur that a part of the object is sacrificed and an unnatural shadow is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-flash flash device, and more particularly, to a photographic image that includes both a distant subject and a close subject. This invention relates to a multi-flash emitting strobe device suitable for contrasting with ordinary auto strobes.

[Prior Art] In general, a strobe body is provided with a photoreceptor for automatic flash control, and this strobe body is integrally fixed to a hot shoe or the like of a camera body, and light metering for automatic flash control is started at the same time as the flash fires. When performing photography in which a switching element such as a thyristor is activated to stop flash emission when the photometric value reaches a value corresponding to the appropriate exposure amount (hereinafter referred to as "stroboscopic exposure"), If the distances of multiple objects included in the copy are approximately constant, most of the objects in the rain can be photographed using light emitted from one flash discharge tube of a strobe body that is integrated into the camera body or a separate strobe body. Irradiation can be uniformly performed, and as a result, a substantially satisfactory strobe transport image can be obtained.

However, when performing such strobe photography, since the object illumination light source is a so-called point light source, a fairly strong shadow is produced on a wall or the like in the background of the object. This results in the final photograph being unnatural and unsightly.

On the other hand, if the transport image includes both a subject located at a far distance and a subject located at a close distance, the exposure amount ratio of the subject located at a far distance and the subject located at a close distance is becomes so large that it exceeds the upper or lower limit of the predetermined latitude of the film.

That is, as shown in FIGS. 10 and 11, the shadow angle of view θ is the shooting area A. Strobe photography is performed with emphasis on the irradiation angle θP, which is the irradiation light P of the strobe body 200 fixed to the camera body 100, and the light reception angle θ1, which is the light receiving beam R of the automatic light receiving unit fixed to the strobe body 200. When doing so, the subject distance ρ from the strobe body 200 is the reference point. A subject Q having . And this subject Q. If the objects 01 to Q4 located at the object distances f11 to j4 are included in each of the longer distances, the light receiving angle OR of the light receiving beam R of the light receiving section is metered with emphasis on the center of the photographing area A. Therefore, the subjects 01 to Q3 having intermediate subject distances 91 to β3 have approximately proper exposure.

On the other hand, at extremely close subject distances. The subject Qo with , is overexposed, and the subject is far away! Subject Q4 having J4 will be underexposed.

For this purpose, adjust the position of the strobe body 200 to the camera body 1.
00 and each subject Q from the same strobe body 200.

~ Q4 may be set at substantially equal distances to emit strobe light, but due to space constraints, etc., it is not always possible to perform a satisfactory setting.

In order to completely eliminate the above-mentioned problems, it is possible to shoot with multiple strobe bodies set up at positions corresponding to each distance so as to provide strobe light corresponding to each of the close, middle, and far distances of the subject. It would be possible to shoot with multiple flash flashes, but doing so would make connecting the synchro cords of each strobe body, fixing the strobe bodies, etc. very complicated, and the light receiving part for strobe dimming would be attached to the strobe body. This requires complex operations such as adjusting the exposure state such as moving the camera from the 200 side to the camera body 100 side, which significantly impedes maneuverability and is not suitable for flash photography where operability is important, such as snapshots. It is.

On the other hand, strobe photography for boat fishing is often done indoors, and in this case, the illumination of the subject is dominated by the direct light component from the light emitting part of the strobe body, and at the same time, the illumination of the subject is dominated by the direct light component from the light emitting part of the strobe body. It can also be used for indirect light components (bounce light components) from surfaces such as surfaces and floors.

Therefore, by directing the light emitting part of the strobe body toward a bounce surface such as the ceiling and illuminating the subject with light from this bounce surface, both near and far objects are illuminated almost equally. Bounce photography is being used.

However, in this type of bounce photography, compared to the case where the illumination of the subject is dominated by the direct light component from the light emitting part of the strobe body, it is possible to obtain a photograph in which the entire subject is illuminated with light. However, since the brightness difference between both a near object and a long distance object is often slightly large, there is a risk that the film's latitude may exceed the upper limit value or be under the upper limit value.

In addition, the photos obtained when taking strobe shots indoors are
What is desired is a photograph in which light surrounds all objects at various distances.

For this purpose, it is possible to perform bounce photography using a multi-flash strobe similar to the one described above, but this significantly impedes mobility and is not suitable for flash photography where operability is important for snapshots etc. It is something that cannot be adapted.

U Problems to be Solved by the Invention J In such conventional strobe photography, when performing strobe photography of a photographing surface that includes both close and far objects, unnatural shadows may appear or the subject may be obscured. It is only possible to shoot at a partial exposure sacrifice, and removing that sacrifice requires extremely complicated installation and adjustment of multiple strobes, which is not a realistic solution. There is a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to achieve excellent maneuverability without requiring complicated installation or adjustment when performing strobe photography of a shooting surface that includes both close-range subjects and long-distance subjects, and to enable light to circulate around each part of the subject. The object of the present invention is to provide a multi-light emitting strobe device that can take photographs.

[Means for Solving the Problems] A multi-flash strobe device according to the present invention is a multi-flash strobe @shadow device that includes a plurality of flash discharge tubes integrally arranged in a strobe device main body. n light-receiving elements each receiving reflected light from the subject corresponding to each of the n areas divided into n areas, and an irradiation center axis located outward from the center corresponding to each of the n areas divided into n areas. n flash discharge tubes each connected to a switching element for stopping light emission, and each output of each light receiving element having a value corresponding to the appropriate exposure amount in each region. The present invention is characterized in that it is configured to include n photometry circuits that actuate switching elements of flash discharge tubes provided corresponding to the light receiving elements to stop emitting light when the light receiving element reaches the light receiving element.

C Effect] The multi-flash flash photography device according to the present invention has n flash discharge tubes each connected to a switching element for stopping light emission, and the center of gravity of each of the areas obtained by dividing the photographing surface into n areas. irradiated as n corresponding to each of the above regions.
Strobe photography in which the switching elements of the n flash discharge tubes are selectively activated based on the outputs of the n flash discharge tubes to stop emitting light, thereby sufficiently following the conditions of the photographing surface and allowing light to circulate around each part of the subject. Can be done.

[Example] Examples of the present invention will be described in detail below with reference to FIGS. 1 to 9.

FIG. 1 is a circuit diagram showing an embodiment of a multi-flash flash device according to the present invention. In the figure, the strobe body 20
0 is connected to a series circuit of a power supply battery 11 and a main switch 12 on the input side, and outputs a DC voltage of several hundred volts.
A C-DC converter 13 is provided, and this DC-DC converter 13 is provided.
The output end of the DC converter 13 is connected to both ends of a main capacitor 14 which provides flash light emission energy. A flash discharge tube 151 is connected to one end of this main capacitor 14.
One end of the discharge electrode is connected, and the other end of the discharge electrode is connected to a thyristor 191, which is a switching element for stopping light emission.
The above main capacitor 1 through the anode and cathode of
It is connected to the other end of 4.

Also, a light receiving element 16 for receiving reflected light from the subject.
1 is provided, and all output ends of this light receiving element 161 are connected to a drive circuit 181 via a photometric circuit 171.

The anode and cathode of the thyristor 191,
Each of the gates is connected to a drive circuit 181 provided to turn it on and off to cause the flash discharge tube 151 to start or stop emitting light.

Flash discharge tube 151 made as described above. Thyristor 19
1. Light receiving element 161. Photometry circuit 171° drive circuit 181
n similar circuits are provided. Note that n above is 4.

Therefore, n photometry circuits 171 to 174 are configured to respectively measure the reflected light from the subject corresponding to each of the n areas obtained by dividing the photographic surface.

As shown in FIG.
It is disposed at the inner part of the light emitting windows 151' to 154' which are formed in sections.

On the other hand, as shown in FIG. 3, each of the light receiving elements 161 to 164 has light receiving areas 81 to 164 that respectively receive the reflected light from the subject corresponding to each of the areas A1 to A4 obtained by dividing the rectangular area A of the photographing plane into four. It is arranged so that it becomes B4.

Each of the light receiving elements 161 to 164 is arranged at the back of the light receiving windows 161' to 164', which are arranged at the front corners of the light emitting windows 151' to 154'.

On the other hand, the irradiation angles of the flash discharge tubes 151 to 154 are arranged such that the irradiation center axis is located outward from the center of each of the areas A1 to A4, and direct light is applied to each of the areas A1 to A4. component and bounce light component. For example, the irradiation center axes C1 to C1 are located outward from the center corresponding to each of the areas A1 to A4.
4, and each of them is arranged so that the irradiation angle thereof is approximately 60'.

Therefore, area A of the imaging surface formed by areas A1 to A4 is irradiated with 120'(60' x 2) light in the vertical and horizontal directions. In other words, the shooting angle of view θA (
In the case of a standard lens, the subject is illuminated at an angle of 120 degrees in the vertical and horizontal directions, compared to approximately 60 degrees in the case of a standard lens.

Furthermore, the distribution of light intensity on the virtual axis of the light receiving area B2 and the light receiving area viB1 is as shown in FIG.
The strength in the central part of A1 is weak, and it is strong in the outer part. In other words, the irradiation center axis is positioned outward from the center corresponding to each of the four divided regions.

Note that the distribution of light intensity on the virtual axis of the light receiving area B3 and the light receiving area B4 is similar to that described above, with the intensity being weak at the center of the areas A3 and A4 of the photographing plane, and being strong at the outside thereof. In other words, the irradiation center axis is 03.03 mm outward from the center corresponding to each of the four divided areas. It is arranged so that C4 is located.

On the other hand, the output end 11- of the high voltage trigger circuit 21 is connected to each trigger electrode of the flash discharge tubes 151 to 154, and the input end of the high voltage trigger circuit 21 is connected to the trigger electrode of each of the flash discharge tubes 151 to 154.
A control circuit 20, which is a system controller, is connected.

The multi-flash light emitting strobe device according to this embodiment configured as described above operates as follows.

That is, when the main switch 12 is turned on, the voltage of the power supply battery 11 is boosted to several hundred volts by the DC-DC converter 13, and the shirt release is performed when the main capacitor 14 is in a fully charged state. and,
A synchro signal X is generated in synchronization with the shutter being fully opened, and a light emission start signal S1 is generated at the output of the control circuit 20. Along with this, the flash discharge tubes 151 to 154 are connected to the high voltage trigger circuit 21.
A high voltage trigger signal 81' is applied to each trigger electrode of the
is supplied, and the xenon gas within the flash discharge tubes 151 to 154 is ionized. At the same time, the drive circuit 181
- 184 supply the H-level light emission control signals T1 to T4 to the respective gates of thyristors 191 to 194, all of the thyristors 19 to 194 are turned on, and the flash discharge tubes 15 to 154 begin to emit flash light.

The irradiation at this time is directed to the irradiation center axes C1 to C4 at an angle and direction such that the irradiation center axis is located outward from the center of each of the areas A1 to A4.

Also, at the same time as the flash light emission starts, the photometry circuits 171 to 174
The integrating capacitors in each of the above are discharged, and photometric integration is started in the photometric circuits 171 to 174 with the respective outputs from the light receiving elements 161 to 164, and the photometric circuit 1
When each photometric integral value of 71 to 174 reaches a value corresponding to obtaining proper exposure, each light receiving element 161 to 16
The outputs U1 to U4 of the photometric circuits 171 to 174 provided corresponding to 4 generate light emission control signals @T1 to T4 corresponding to the stop of light emission from any one of the drive circuits 181 to 184, and the outputs from one of the thyristors 191 to 194 are generated. The anode and cathode of are reverse biased and turned off.

For this reason, when the amount of light reflected from the subject in each area A1 to A4 reaches a predetermined value and proper exposure is achieved, the corresponding flash discharge tubes 151 to 154 sequentially stop emitting light.

Therefore, strobe bounce illumination is performed such that all subjects corresponding to each of the areas A1 to A4 are properly exposed.

Further, in this embodiment, since the main capacitor 14 is connected in parallel to the plurality of flash discharge tubes 151 to 154, the flash light emission energy can be used effectively.

In other words, when a single main capacitor is provided for each of the plurality of flash discharge tubes 151 to 154, the main capacitor that has stopped emitting light earlier based on the condition of the subject will store its residual energy in the current state. It does not contribute to the light emission of another flash discharge tube that is currently emitting light, but rather contributes during charging prior to the next flash photography.

Therefore, it is necessary to set the respective capacitances of the main capacitors provided in each of the plurality of flash discharge tubes 151 to 154 to be large enough to provide redundancy, which results in an increase in the size of the device.

However, in this embodiment, the common main capacitor 14 is provided for the plurality of flash discharge tubes 151 to 154, so that the light emission energy of the main capacitor 14 can be contributed to the light emission until the end.

In the above description, it goes without saying that the light emission stop point is determined based on comprehensive conditions that take into account the reflectance of the subject, the reflection efficiency of the bounce surface, and the like.

Further, in the above-described embodiment, when the output of the photometric circuits 171 to 174 reaches a value corresponding to the appropriate exposure amount, the switching element of the flash discharge tube provided corresponding to the photometric circuit is activated to stop light emission. However, the present invention
Although not limited to this, even after the light emission of any flash discharge tube is stopped, some additional illumination is provided by the light in the flash discharge tube that is currently emitting light, so the photometry circuit 17
The integral reference voltages 1 to 174 may be set slightly lower.

Further, in the above embodiment, four flash discharge tubes are provided to irradiate the areas A1 to A4 divided into four rectangular shapes, but the invention is not limited to this, and as shown in FIG. A light-receiving area E1. E2 may also be placed.

In this case, the distribution of light intensity on the virtual axis of the light-receiving areas E1 to E2 is as shown in FIG. The strength is weak in the area, and strong above and below it. In other words, the irradiation center axis is positioned outward from the center corresponding to each of the two divided regions.

In addition, the light intensity of strobe irradiation by a flash discharge tube is
As shown in the figure, the upper portion of the central axis may be made stronger and the lower portion may be made weaker.

This modification is based on the idea that when fishing on a boat, there is a background such as a wall that is far away above the shooting side. By increasing the light intensity in the upper part of the side, it is possible to perform photometry control in a multi-flash flash photography device that more closely matches the actual situation.

Further, in the above example, four flash discharge tubes are provided to bounce irradiate the areas A1 to A4 divided into four rectangular areas, but the light receiving area in this case is the area A1 as shown in FIG. ．． Two light-receiving areas F2. F3 may also be formed. This modification is based on the idea of preventing underexposure, which is likely to occur because in boat fishing, there is often a background such as a wall that is far away above the photographing side.

Further, as shown in FIG. 8, area A3. Two light-receiving areas F3 correspond to the axis shifted by O' with respect to the central axis of A4.
．． F4 may also be formed. This modification is based on the idea that - In boat fishing, there are often objects located at a very close distance at the bottom of the sketch, so overexposure is likely to occur. .

Roughly speaking, three flash discharge tubes are provided, and the photographing side is divided into two vertically in a rectangular shape, and the upper part is further divided into two so that they are arranged in areas G1 to G3 as shown in Fig. 9. Good too,
In this case, the light receiving area is area G1. It is conceivable to form two light-receiving regions H1 and H2 corresponding to the central axis of region G2, and to form a light-receiving region H3 corresponding to the central axis of region G3. In this case as well, the flash discharge tubes that irradiate the areas G1 to G3 correspond to the respective areas G1 to G3.
Of course, it is necessary to arrange the irradiation center axis so that it is located outward from the center corresponding to G3.

In addition, the main capacitor can be charged not only by a DC/DC converter but also by using a high-voltage laminated battery or an A
Of course, it is also possible to use a C power source.

[Effects of the Invention] As described above, the multi-flash flash device according to the present invention uses n flash discharge tubes each connected to a switching element for stopping light emission, and divides the reflected light image of the subject into n pieces. Each area is irradiated, the n light receiving elements receive the reflected light from the subject corresponding to each area, and when the output reaches a value corresponding to the appropriate exposure amount, each switching element is activated to emit light. Because it is designed to stop, there is no need to sacrifice part of the subject or create unnatural shadows when performing strobe shadows on portraits that include both close and long-distance subjects. Since it does not require very complicated installation or adjustment, it is possible to perform multi-flash light emitting strobe R shadows with excellent maneuverability and excellent operability.

Furthermore, since the multi-flash strobe device according to the present invention can obtain proper exposure in all areas of the photographed image, it can be used not only for strobe photography of photographic images that include both close and long-distance subjects, but also for strobe photography of subjects. This makes it possible to uniformly illuminate each part of the photographed image even when photographing with a strobe light where there is little difference in distance between objects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a multi-flash flash device showing an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG.
Similarly, FIG. 4 is a diagram showing the relationship between the light emitting position and the light receiving area, FIG. 4 is a waveform diagram for explaining the operation, FIG. 5 is a diagram showing a modification of the above embodiment, and FIG. FIG. 7 is a diagram showing another example of the relationship of light intensity; FIG. 8 is a diagram showing another modification of the photographing area and the light receiving area; FIG. 9 is a diagram showing still another modification of the photographing area and the light receiving area, and FIGS. 10 and 11 are
It is a diagram for explaining a conventional problem. 14... Main capacitor 15-154
......Flash discharge tubes 161-164...
...... Light receiving elements 171 to 174 ......
Photometric circuits 181 to 184... Drive circuit 1
91-194 Thyristor (switching element) Patent applicant Kako Co., Ltd.

Claims (1)

[Scope of Claims] In a multi-flash flash photography device including a plurality of flash discharge tubes integrally arranged in a strobe device main body, a photographic image is divided into n areas, and the reflected light from the subject corresponds to each of the n areas. n light-receiving elements that respectively receive light, and are arranged so that the irradiation center axis is located outward from the center corresponding to each of the n divided regions, and each has a light-emission stopper. n flash discharge tubes connected to switching elements, and a flash light provided corresponding to the light receiving element when each output of each of the light receiving elements reaches a value corresponding to the appropriate exposure amount in each of the above regions. A multi-flash flash photography device characterized by comprising n photometry circuits that actuate a switching element of a discharge tube to stop light emission.