JP2969535B2 - Camera with strobe device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention, flash equipment camera with, details by the light distribution characteristics of the flash light emission device to the ranging information of the object
Te are those related to a camera having a variable and the strobe equipment.

[0002]

2. Description of the Related Art Conventionally, a strobe has been used when the illuminance of a subject is lower than a certain level.
The strobe light distribution normally applied to the subject from the camera side is designed to have uniform characteristics within the angle of view. Therefore, a conventional strobe light distribution will be described below with reference to FIGS.

FIG. 23 shows the light distribution characteristics in the long side direction of a screen in a conventionally used strobe device. The horizontal axis indicates the left and right angles from the optical axis direction of the photographing lens, and the vertical axis indicates the light emission from the strobe. The quantities are indicated respectively. Since the photographing range in this case is about 25 degrees on one side, the light distribution pattern is set to 30 degrees on one side with some margin.

When a strobe device having such a light distribution characteristic is used to photograph an object a1, b1, c1 as shown in FIG.
If the positional relationship between 1 and c1 is the same distance d1 for each subject as shown in FIG. 25, it is possible to take a picture in which the entire photographing screen is substantially properly exposed.

[0005] However, when the subject having the positional relationship between the camera 1 with built-in flash and the subjects a2, b2, and c2 as shown in FIG. 27 is to be photographed in a composition as shown in FIG. Since the focus is often on the subject a2, the subject distance d in FIG.
The first subject a2 has an appropriate exposure, but the subject distance d2
The subject b2 and c2 of d3 will be underexposed.

As described above, in actual flash photography, only one proper exposure can be obtained for a plurality of distances within the field of view.

Therefore, when it is necessary to obtain a state closer to natural light, a plurality of strobes have been used to emit multiple lights or perform bounce photography.

[0008] In addition to this, means for changing the light distribution within the angle of view according to the type of the subject with a single strobe is disclosed in Japanese Utility Model Publication No. 59-28416 and Japanese Patent Publication No. 61-1902.
No. 1. These means dispose a liquid crystal plate or the like that can affect a part of the strobe light transmission range in front of the luminous body having a uniform light distribution pattern, and, when a release operation is performed, before the main light emission, To determine whether there is an object at a short distance, and if so, drive the liquid crystal to reduce the strobe light in that area, thereby overexposing the object at the short distance. Was trying to prevent that from happening.

[0009]

However, the above-mentioned means using a plurality of strobes or performing bounce photography not only increases the size and complexity of the strobe light emitting device, but also makes it difficult for the photographer to use each device. Since it was necessary to find the optimal setting for the subject and required a high level of skill, it was only possible for some skilled workers and it was difficult for ordinary users to master it. Further, the light distribution can be changed by a liquid crystal member disposed in front of the light emitting section.
In the means disclosed in, for example, Japanese Patent No. 28416, it is necessary to provide a liquid crystal member and a liquid crystal control device which are not directly related to the strobe device. Further, in this means, since the light distribution characteristics are changed by blocking the effective light rays with liquid crystal or the like, the loss due to diffusion and heat generation is extremely large, and even if the desired light distribution characteristics are obtained, the light emission from the strobe light is obtained. There was also a disadvantage that the amount was greatly reduced.

In actual use, the above-mentioned Japanese Patent Publication No.
In the means disclosed in No. 19021, prior to the main light emission, infrared light is emitted to measure the reflected light, and then the liquid crystal is driven. Since the release time lag from the start to the actual exposure is extremely long, there is a possibility that a shutter chance may be missed. In addition, since the main object is to reduce the strobe light to a nearby object with respect to the main subject, there is also a drawback that it is effective only in preventing a subject at a short distance from being overexposed. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and reduce the release time lag during flash photography.
Together, to provide a more easy with a single structure, a plurality of strobe <br/> equipment camera with as possible out to provide a proper exposure for an object in a different position.

[0012] The strobe equipment with a camera of the present invention, photographing
Asymmetric in the horizontal direction with respect to a vertical line passing through the center in the angle of view
It has a light distribution pattern and covers almost the entire area within the field of view.
A first light-emitting unit that emits constant illumination light,
A light distribution pattern of the first light emitting unit with respect to a vertical line passing through the heart;
To a vertical line that is approximately line-symmetric with the
It has a light distribution pattern that is asymmetrical in the horizontal direction
A second method of irradiating predetermined illumination light over substantially the entire area within the corner;
A light emitting unit, a distance measuring means for measuring a distance to an object of a plurality箇plant shadows the screen shooting, based on the output of the distance measuring means,
At least two subjects out of multiple locations in the shooting screen
The light emission amount suitable for each of the distance to the light emission amount calculating means for calculating each for the above two light-emitting portions,
The light emitting amount calculating means said first and second follow the output of the
The quantity of light from the light emitting portion Gyosu in Rukoto braking independently, shooting
A light emission amount control means for changing a light distribution pattern within a shadow angle of view .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. First, prior to describing an embodiment of the present invention, the basic concept of a strobe device according to the present invention will be described. Distance measuring means for detecting the distance between a plurality of subjects and a plurality of distance measuring means obtained by the same means. Calculating means for determining a light distribution characteristic so that exposure is appropriate for at least one subject other than the focused object based on the distance information; and varying the light distribution characteristic based on information of the calculation means. Light emitting means,
The light distribution characteristics optimal for the situation of the subject can be obtained only by pressing the shutter.

When the light distribution characteristic optimal for the situation of the subject is applied to a photographing screen as shown in FIG.
In order to obtain a photograph in which each of the subjects a2, b2, and c2 is properly exposed, it is necessary to irradiate strobe light having a light distribution characteristic corresponding to each subject position as shown in FIG.

However, in order to obtain the light distribution characteristics shown in FIG. 2, the mechanism becomes complicated and large. Therefore, in the strobe device of the present invention, as shown in FIG. 3, by controlling the weight based on distance measurement information of a plurality of subjects so as to obtain a light distribution characteristic with one weight increased. At least one subject other than the focused subject can be photographed in a state close to proper exposure.

That is, the strobe device is arranged so that the direction in which the amount of light emitted from the strobe device changes substantially coincides with the direction in which a plurality of distance measuring positions are arranged within the field of view. . This makes it possible to easily obtain light distribution characteristics suitable for a subject.

The above is the basic concept of the present invention. Next, a flash device according to a first embodiment of the present invention will be described with reference to FIGS.
7 will be described below.

FIG. 4 is a perspective view of a camera with a built-in strobe device having a built-in strobe device according to the first embodiment of the present invention. When a release button 18 is pressed, distance measurement, photometry, exposure, and winding are fully automatic. In the zoom camera to be performed, each operation is performed by a known technique.

The distance measurement operation of the camera with a built-in flash is performed by A
An active type system using the F light projecting unit 12 and the AF light receiving unit 13 is set so that distance measurement can be performed at three locations on the screen. The three locations are the circles 2a, 2b, and 2c indicated by broken lines in FIGS. 24 and 26, respectively, so that three locations in the long side direction of the screen can be measured.

Reference numeral 10 denotes a strobe light emitting unit, which is indicated by A- in FIG.
As shown in the A 'sectional view, two arc tubes 23 and 25,
It is mainly composed of two reflectors 22 and 24 and a strobe panel 21 that covers them. That is, the strobe panel 21 is a transparent plate-like member fixed to the exterior member of the camera. Further, the first reflector 22 and the second reflector 24 are independently fixed to a fixing member (not shown). Further, the first arc tube 23 and the second arc tube 2
Reference numeral 5 is fixed to the inner surfaces of the first and second reflectors 22 and 24 by a fixing member (not shown).

As shown in the perspective view of FIG. 6, the first and second reflectors 22 and 24 are formed such that the lengths of the reflectors are asymmetric. Therefore, the light distribution characteristics when each of the first and second arc tubes 23 and 25 having the reflector having such a shape emit light independently are shown in FIGS. 7A and 7B. And a non-uniform pattern in the angle of view. Since these light distribution characteristics are substantially symmetric with respect to the optical axis 0 in FIGS. 7A and 7B, they are combined when the first and second arc tubes 23 and 25 emit light with the same light amount. Since the light distribution characteristics are the sum of the respective light distribution characteristics, uniform light distribution characteristics can be obtained over the entire photographing screen.

Reference numeral 11 denotes a photographing lens, 17 denotes a zoom button for zooming, and 15 denotes a display unit for displaying a photographing state and an operation state.

FIG. 1 is a block diagram showing a circuit configuration of this embodiment. A first arc tube 23 has a first trigger circuit 31 having a trigger transformer for light emission, and a first trigger circuit 31 for accumulating light emission energy. And one main capacitor 32. Similarly, the second arc tube 25 has a second arc tube.
Trigger circuit 33 and a second main capacitor 34 are connected to each other.

Both trigger circuits 31 and 33 have both arc tubes 2
A light amount control circuit 35 for controlling the light emission amounts of the light source 3 and the light source 25 is connected to the light amount control circuit 35. A comparison operation circuit 36 as a light emission amount calculating means for calculating the appropriate light emission amount for each of the two arc tubes 23 and 25 is connected to each other.

Next, the operation of the first embodiment configured as described above will be described. When the release button 18 is pressed, distance measurement and photometry are first performed.

The distance measurement is performed as shown in FIGS.
Distance detection is performed at two locations, and distance measurement data of the closest subject is adopted as distance data. In the photometry, the brightness of the center of the screen and the brightness of the entire screen are measured, and it is determined that the strobe can be automatically emitted at the time of low luminance and backlight. Thereafter, the exposure operation on the film surface and the winding of the film are performed, and a series of photographing operations ends.

By the way, in the case of the subject as shown in FIGS. 24 and 25, the first and second arc tubes 23 and 25 emit the same amount of light, so that three subjects a1, b1 and
It becomes possible to properly expose c1.

On the other hand, in the case of the subject shown in FIGS. 26 and 27, in this embodiment, three subjects a2, b2 and c2 are used.
The distance measurement data d1 of the subject a2 located at the shortest distance is adopted as the distance data from the distance measurement data of the three places, and the lens is extended to the position of the distance d1. In this case, subject b
2 and c2, and the distance measurement data d1
Are both input to the comparison operation circuit 36.

Here, the relationship between the flash emission amount and the subject distance will be described. Generally, the amount of light emitted from the strobe and reaching the subject is inversely proportional to the square of the distance. Therefore, the distance d1 of the focused object a2 is larger than the object distance d.
It is possible to calculate how much light is required to properly expose the subjects b2 and c2 at 2 and d3.

That is, the distance to the focused object a2 is d1,
When the distance to the subject c2 is d3, the focused subject a
If the light amount applied to the object c2 is G1, the light amount G2 to be applied to the subject c2 is given by G2 = G1 × (d3 / d1) ² .

When the subject a2 at the distance d1 is set to the proper exposure as shown in FIG. 3 from the light distribution patterns stored in advance in the comparison operation circuit 36, the distances d2 and d3 The light distribution pattern that can be set to a state close to the proper exposure for the subjects b2 and c2 is determined.

The non-uniform light distribution characteristics as shown in FIG. 3 can be obtained by controlling the light emission amounts of the two arc tubes 23 and 25, respectively.
Transmits the determined light quantity ratio between the two light emitting units at the time of light distribution to the light quantity control circuit 35, and, in conjunction with a shutter operation, that is, an exposure operation, outputs a signal corresponding to the light emission amount of each of the light emitting tubes 23 and 25 to 1, and transmitted to the second trigger circuits 31, 33.

As described above, the first and second arc tubes 23, 2
5 emit light with a predetermined light amount, and as a result, the light distribution characteristics as shown in FIG. 3 can be obtained.

As described above, according to the first embodiment, the photographer can obtain a photograph close to the proper exposure even for subjects other than the focused subject simply by pressing the release button 18 (see FIG. 4). Becomes possible. In the first embodiment,
Although an example using an AF device for three-point ranging is shown, the number of ranging points is three.
It is needless to say that the light distribution characteristics can be determined based on more accurate information if more multi-point distance measurement is performed.

In the above-described embodiment, an example has been shown in which the light distribution characteristics are determined so that both the subjects b2 and c2 at the distances d2 and d3 are close to the proper exposure for the in-focus subject a2 at the distance d1. Is not always d1 <d2 <d3. Therefore, as a modified example of this embodiment, a case where the distances of the three subjects a2, b2, and c2 shown in FIG. 26 are, for example, d1 <d2> d3 and d1 <d3 is considered.
Consider below.

In this modified example, the point that the in-focus subject is set as the subject a2 located at the closest distance d1 is the same as in the first embodiment. As a subject (hereinafter, referred to as a second subject), instead of the subject b2 located at the farthest distance d2, a subject having a distance measurement value closest to the distance measurement value of the in-focus subject, that is, the subject c2 Is selected as the second subject.

Further, the focusing distance in FIG.
In other words, the case of (2), that is, the case where the focused object is the object b2 at the center of the screen and d2 <d1, d2 <d3, and d1 ≠ d3, will be considered below as another modified example of the present embodiment. In this other modification, since both d1 and d3 cannot be properly exposed, both light-emitting portions emit light with the same amount of light so as to obtain uniform light distribution characteristics.

In other words, the in-focus subject is located at the center of the screen, and the distance d ″ of the other subject opposes the in-focus subject to the second subject with respect to the distance d ′ to the second subject. When the relationship of d ′ ≠ d ″ is satisfied on the side, the same amount of light as that of the in-focus subject is emitted to the entire area within the shooting angle of view.

In FIG. 26, the focusing distance d1
On the other hand, the case where the difference in the distances that satisfies d2 / d1> 4 d3 / d1> 4 is considered as still another modified example of the present embodiment will be described below. In this case, since the difference in subject distance is too large, it is not possible to determine a light distribution pattern that makes exposure to all subjects appropriate. It is assumed that the light amount is irradiated.

The above is the description of the first embodiment. Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 8 is a perspective view of a camera with a built-in strobe device having a built-in strobe device according to a second embodiment of the present invention, in which distance measurement, photometry, exposure, and winding are automatically performed by a release button 18. Although the camera is the same as the first embodiment, the second embodiment is different from the first embodiment in that the left strobe light emitting unit 10 and the right strobe light emitting unit 111 are disposed on both sides of the photographing lens 11, respectively.

That is, in the first embodiment, FIG.
Although the light distribution characteristics in the case of taking a photograph in which a plurality of subjects are arranged in a horizontal direction as shown in FIG. 26, in actual photographing, the camera may be vertically set and photographed on a vertically long screen. Therefore, in the second embodiment, in addition to the usual horizontally long photographing screen as shown in FIG. 14 described below, appropriate exposure is given to each subject when photographing on a vertically long screen as shown in FIG. I can do it.

In this case, if the distance measuring points are set as in the first embodiment, when the camera is changed from a horizontal position to a vertical position, three vertical distances are measured. I will. However, since a normal subject is a person, a tree, or the like, it is meaningless to perform multi-point distance measurement in the vertical direction, so that the distance measurement direction is also changed. In the second embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

Returning to FIG. 8, the left-side strobe light emitting section 10,
The right strobe light emitting unit 111 is provided with two light emitting tubes therein. The left flash unit 10
As shown in FIG. 9 in section BB ', the first and second arc tubes 2 are formed in the same manner as in FIG.
The central axes of the cameras 3 and 25 are arranged so as to coincide with the vertical direction of the camera.

The right strobe light emitting unit 111 includes the first and second reflectors 22, 22 in the left strobe light emitting unit 10.
A third reflector 132 and a fourth reflector 134, which are similar to or slightly narrower in light distribution characteristics, are respectively fixed to a fixing member (not shown). It is arranged to match the direction.

The third arc tube 133 and the fourth arc tube 135
Are fixed to the third and fourth reflecting umbrellas 132 and 134 by fixing members (not shown), respectively.

In this embodiment, four arc tubes 23, 25,
133 and 135, the light distribution characteristics of each arc tube alone are as shown in FIG.
As shown in (A) and (B), the screen is not uniform in the horizontal direction (horizontal direction of the camera). In the case of the right strobe light emitting unit 111, as shown in FIGS. It is uneven in the vertical direction.

The light distribution characteristics shown in FIGS. 11A and 11B and the light distribution characteristics shown in FIGS. 12A and 12B are symmetrical with respect to the center of the screen. When the first and second arc tubes 23 and 25 emit the same amount of light, the third and fourth arc tubes 13 and 25
When 3,135 emits the same amount of light, it is possible to obtain uniform light distribution characteristics over the entire screen.

That is, two types of strobe light emitting units are provided so that the direction in which the amount of irradiation light of the strobe device can be changed is substantially orthogonal, and one of them is operated at the time of exposure. Returning to FIG. 8 again, the AF light projecting unit 12 and the AF light receiving unit 1
The distance measuring unit 3 is an active multi-point distance measuring method, and circles indicated by five broken lines 2a to 2e in the figure as shown in FIG. Measure the distance inside.

In other words, in contrast to the three-point distance measuring method of the first embodiment, in the second embodiment, the distance can also be measured above and below the central portion, that is, in the long-side direction of the screen within the shooting angle of view. It is configured to be able to measure at least five points so as to be orthogonal to the short side direction.

FIG. 13 is a block diagram showing a circuit configuration of the second embodiment. The first to fourth arc tubes 23, 25, and 13 are shown in FIG.
3 and 135 include first to fourth trigger circuits 3 respectively.
1, 33, 142, and 145 are provided side by side. As for the main capacitor for storing the emission energy, the first main capacitor 32 is connected to the first arc tube 23 and the third arc tube 133.
The second main condenser 34 is connected to the second arc tube 25.
And the fourth arc tube 135. First
The fourth to fourth trigger circuits 31, 33, 142, and 145 are controlled by a light amount control circuit 147 to which a distance measuring unit 37 and a comparison operation circuit 36 are connected.

The operation of the second embodiment constructed as described above will be described. Of the five measurable locations, three are usually measured along the long side of the screen, and the closest subject distance is determined by focusing data. And When the composition is as shown in FIG.
As in the first embodiment, a calculation is performed to bring each subject closer to the proper exposure from the distance measurement data d1, d2, and d3 as shown in FIG. However, as shown in FIG. 16, when the camera is held in the vertical position, 2a, 2b, 2
At the distance measurement position c, accurate screen information cannot be obtained.

As described above, when photographing in the vertical position,
A detection switch (not shown) is provided inside the camera so that the distance measurement position is automatically switched between 2d, 2b, and 2e. Here, the detection switch (not shown) is configured by a switch using gravity, but the detection method is not particularly limited.

When the release operation is performed in the composition shown in FIG.
Distance information of the positions 2d, 2b, and 2e is obtained by the distance measuring unit 37 shown in FIG. The comparison operation circuit 36 first determines the distance measurement point 2d located on the short distance side, that is, the distance d1 as the focus data.

Next, the light distribution characteristics are determined. In FIG. 16, since there is no subject at the distance measurement point 2e and the distance measurement data close to infinity is obtained, the light distribution characteristics are determined as shown in FIG. 17 is determined only by d2 data with respect to the distance measurement data d1.

The light distribution characteristics obtained in this manner are of a type that changes in the direction of the short side of the screen.
As shown in (A) and (B), the right and left strobe light emitting units 111 having uneven light distribution characteristics in the vertical direction are used, and the third and fourth flash units are used.
The required light distribution characteristics can be obtained by appropriately changing the light amounts of the light emitting tubes 133 and 135.

Therefore, the comparison operation circuit 36 performs the third and fourth operations.
The light emission ratio of the light emitting tubes 133 and 135
7 Then, the light amount control circuit 147 sends a trigger signal to the third and fourth trigger circuits 142 and 145 in accordance with the actual exposure timing of the shutter, and controls each light emission amount. As described above, the total light amount is shown in FIG.
The optimum light distribution characteristic for the photographing of No. 6 can be obtained.

Further, as shown in FIG. 14, in the case of the horizontal position (normal position), the light amount control circuit 147 sends a signal to the first and second trigger circuits 31 and 33 so that necessary light distribution characteristics are obtained. It goes without saying that you get it.

As described above, according to the second embodiment, the light emitting section capable of distributing light in the long side direction of the screen and the light emitting section capable of distributing light in the short side direction are provided. Since the measurement can be performed in both the long side direction and the short side direction, appropriate light distribution characteristics can be always obtained in any of the horizontal and vertical compositions.

In this embodiment, the method of automatically switching the distance measurement position by the detection switch is used. However, the automatic switching is not particularly required to reflect the intention of the photographer. There is no problem even if the method of switching is used.

Next, a flash device according to a third embodiment of the present invention will be described with reference to FIGS. In each of the above embodiments,
In the third embodiment, the present invention is applied to a camera using a zoom lens. In the third embodiment, the present invention is applied to a camera using a zoom lens. The characteristics change. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 18 is a cross-sectional view of a main part of the strobe light emitting section in the wide state. The strobe panel 221 has a Fresnel formed on the inner side thereof to constitute a convex lens. The first and second reflecting umbrellas 22 and 24 are respectively the first and second reflecting umbrellas.
It has second arc tubes 23 and 25 and is fixed to a strobe stand 226. The strobe base 226 is installed by an interlocking member (not shown) so as to be movable in conjunction with the zooming operation of the taking lens.

FIG. 19 shows light distribution characteristics in a wide state. When the first and second arc tubes 23 and 25 emit the same amount of light, uniform light distribution characteristics can be obtained in a range of about 25 degrees on one side. It is shown that.

FIG. 20 is a cross-sectional view of a main part of the strobe light emitting unit when the photographing lens is telephoto. The strobe panel 221 and the first and second light emitting tubes 23 and
25 distances have increased. Therefore, if the amounts of light emitted from the first and second arc tubes 23 and 25 are the same, the light distribution characteristics in the telephoto state become a uniform pattern in a range of about 15 degrees on one side as shown in FIG. .

The distance measuring section in this embodiment is a TTL three-point distance measuring method using a photographic lens, and the distance measuring position on the screen is constant even if the focal length changes.

FIG. 22 is a block diagram showing the circuit configuration of the third embodiment, which differs from FIG. 1 in the first embodiment in that a focal length detector 238 is added. There is no difference from FIG.

The operation of the third embodiment configured as described above will be described. In the third embodiment, an arbitrary angle of view can be selected by zooming in photographing.
However, at any angle of view, as shown in the light distribution patterns of wide and tele in FIGS. 19 and 21, if the light emission amounts of the first and second arc tubes 23 and 25 are the same, a uniform light distribution can be obtained. Since the same is not changed, the light distribution pattern suitable for each subject can be obtained by performing the distance measurement by the release operation and calculating the obtained distance measurement data of the three points in the same manner as in the first embodiment.

At this time, the comparison operation circuit 36 shown in FIG.
, The focal length information detected by the focal length detector 238 is input together with the distance measurement information. And the comparison operation circuit 3
6 stores changes in light distribution characteristics at each focal length, and an optimum light distribution and exposure can be determined from the data and the distance measurement data. Then, similarly to the first embodiment, the first and second arc tubes 23 and 25 are controlled in light amount, and optimal photographing can be performed. As described above, according to the third embodiment, the present invention can be used more efficiently within the shooting angle of view when applied to a zoom strobe.

In the three embodiments described above, the present invention is applied to a camera with a built-in strobe. However, the present invention is not limited to these, and can be applied to an external strobe of a single-lens reflex camera. . In addition, the second
When changing the light distribution in two directions as in the embodiment,
It is also possible to use a built-in strobe for one direction and an external strobe for the other direction.

As described above, according to each of the above embodiments,
Since the strobe light distribution characteristics necessary to photograph the subject to be focused and at least one subject other than the subject with proper exposure are determined based on a plurality of distance measurement information,
The photographer can always photograph with appropriate light distribution characteristics simply by pressing the release button.

Therefore, when a plurality of subjects are photographed, the subject in front of the subject is not extremely overexposed and floats, or the subject behind is not underexposed and collapsed. You can get a photo that is very close to the image that can be seen with.

As means for changing the light distribution characteristics,
Since the light amount control of the two light emitting units is used and the distance measurement information is used as the light distribution determining means, it is not necessary to operate a new drive system or a dedicated detection system to implement the present invention.
The time lag from the release operation to the exposure control is not sacrificed at all.

[0073]

As described above, according to the present invention, a predetermined amount of illumination light is applied to a plurality of subjects at different positions.
With a strobe device adapted to irradiate
That it had contact to the camera, the light emission amount to be emitted by the light emitting means comprising at least two light emitting portions having different light distribution characteristics, operation control based on the distance information of the plurality of subjects
Is performed, and a plurality of
Irradiation light is applied to the object.
Correct exposure for each of multiple subjects at different positions
Can be given. Then, as compared with the method of arranging the liquid crystal member in front of the light-emitting portion, both the release time lag at the time of flash photography small can Kusuru not require electronic flash device and directly unrelated components, more Numerous remarkable effects such as a simple configuration can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a flash device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing light distribution characteristics for appropriately exposing a plurality of subjects at different distances.

FIG. 3 is a diagram of light distribution characteristics according to the present invention.

FIG. 4 is a perspective view of a built-in strobe camera incorporating a strobe device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the strobe light emitting unit in FIG. 4;

FIG. 6 is a perspective view of the reflector in FIG. 5;

FIG. 7 is a diagram showing light distribution characteristics of each arc tube in FIG. 5;

FIG. 8 is a perspective view of a camera with a built-in flash having a built-in flash device according to a second embodiment of the present invention.

FIG. 9 is a cross-sectional view of the left strobe light emitting unit in FIG. 8;

FIG. 10 is a cross-sectional view of the right strobe light emitting unit in FIG. 8;

FIG. 11 is a diagram showing light distribution characteristics of each arc tube in FIG. 9;

FIG. 12 is a diagram showing light distribution characteristics of each arc tube in FIG. 10;

FIG. 13 is a block diagram showing a circuit configuration according to a second embodiment of the present invention.

FIG. 14 is a composition when the camera is set to a horizontal position in the second embodiment.

FIG. 15 is a diagram showing the distance between each subject in FIG. 14;

FIG. 16 is a view showing a composition when a camera is set in a vertical position in the second embodiment.

FIG. 17 is a view showing the distance between the respective objects in FIG. 16;

FIG. 18 is a cross-sectional view of a strobe light emitting portion at a wide position in a camera having a built-in strobe device according to a third embodiment of the present invention.

FIG. 19 is a diagram showing light distribution characteristics in FIG. 18;

FIG. 20 is a sectional view of a strobe light emitting unit at a telephoto position in a third embodiment.

FIG. 21 is a diagram showing light distribution characteristics in FIG. 20;

FIG. 22 is a block diagram illustrating a circuit configuration according to a third embodiment.

FIG. 23 is a view showing light distribution characteristics in a long side direction of a screen in a conventional flash device.

FIG. 24 is a composition diagram of a conventional flash device.

FIG. 25 is a diagram showing the distance between each subject in FIG. 24;

FIG. 26 is a composition diagram of a conventional flash device.

FIG. 27 is a diagram showing the distance between each subject in FIG. 26;

[Explanation of symbols]

 23 first luminous tube (light-emitting means) 25 second luminous tube (light-emitting means) 35 light-quantity control circuit (luminous-quantity control means) 36 comparison arithmetic circuit (luminous-quantity calculating means) 37 ... Distance measuring unit (distance measuring means) 133 ... third light emitting tube (light emitting means) 135 ... fourth light emitting tube (light emitting means) 147 ... light amount control circuit (light emission amount controlling means)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 15/05 G03B 7/00-7/28 G02B 7/28-7/40

Claims (1)

(57) [Claims] 1. A vertical line passing through a center in a photographing angle of view.
Has a light distribution pattern that is asymmetrical in the horizontal direction
First light emission for irradiating a predetermined illumination light over substantially the entire area of
And the first light emission with respect to a vertical line passing through the center of the shooting angle of view.
Approximately line-symmetric with the light distribution pattern of the part and at the center within the field of view
Light distribution pattern asymmetric in the horizontal direction with respect to the vertical line passing through
Having a predetermined illumination light over substantially the entire area within the shooting angle of view.
And the second light-emitting unit for irradiating, and measures a distance to an object of a plurality箇plants the shooting screen based on the output of the distance measuring means, a plurality of locations of the photographing screen
At least a light emission amount suitable for each of the distances to two points of the subject and the light emission amount calculating means for calculating each for the above two light-emitting portions, said first and follow the output of the light emission amount calculating means of Two
The quantity of light from the light emitting portion Gyosu in Rukoto braking independently, shooting
Strobe equipment with camera characterized by comprising a light emission amount control means for enabling change the light distribution pattern, the in Kagee angle within.