JPH1164933A - Stroboscope device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sufficient strobe light quantity over the entire photographing range of a camera, in a stroboscope device. SOLUTION: The stroboscope device is constituted in such a manner that first and second stroboscope light sources 1 and 2 are combined. Intensity center lines X1 and X2 for showing maximum intensity in the luminous intensity distribution characteristics of the respective stroboscope light sources 1 and 2 are inclined to a stroboscope light irradiation center line C by 20 deg.-40 deg., preferably 25 deg.-35 deg. and more preferably 30 deg. respectively. Thus, a strobe light quantity in the range of about 30 deg. on both sides of an irradiation center can be drastically increased. Especially, the stroboscope light quantities at positions of 20 deg. and 30 deg. to the irradiation center can be made into about 90% and 85% of the stroboscope light quantity at the irradiation center respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe device used in a camera, and more particularly to a strobe device capable of irradiating a peripheral portion of an image to be shot with a sufficient amount of strobe light.

[0002]

2. Description of the Related Art The structure of a conventional strobe light is shown in FIG. As shown in FIG. 4, a conventional strobe light 11 is:
A strobe valve 15 is provided in a space defined by a lenticular lens 13 formed by combining a plurality of lenses and a reflector 14. And
When the strobe valve 15 emits light at the time of photographing, the light emitted to the reflection plate side is reflected by the reflection plate 14 and irradiated to the subject together with the light emitted from the lenticular lens side. Here, the strobe light emitted from such a strobe light 11 has a light distribution characteristic as shown in FIG. 5 in the horizontal direction (when the camera is held horizontally). Note that the light distribution characteristics shown in FIG. 5 are based on the light amount (center light amount) L0 of the irradiation center at a position L meters from the position S of the strobe light 11, and a predetermined value on both sides of the irradiation center at a predetermined distance L meters. Light amount L20, L at angular position (20 degrees, 30 degrees)
Numeral 30 indicates the degree of decrease from the central light amount.

[0003]

Generally, in a camera for photographing a film of 35 mm size, when a standard lens of 50 mm is used, the photographing range is about 20 degrees on both sides of the optical axis of the lens. When a 28-mm wide-angle lens is used, the range of about 30 degrees on both sides of the optical axis of the lens is the photographing range. However, the above-mentioned conventional strobe light has a light distribution characteristic as shown in FIG. 5, and is approximately 60% of the central light amount at a position 20 degrees on both sides from the irradiation center, and is a central light amount at a position 30 degrees on both sides from the irradiation center. About 40% of the light amount. Therefore, even when shooting with a strobe light, the surrounding image becomes significantly darker than the image at the center of the shooting, and only the center image rises white, a so-called white phenomena. Will occur.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a strobe device capable of irradiating a sufficient amount of strobe light also around an irradiation center.

[0005]

A strobe device according to the present invention is a strobe device comprising at least two, preferably two, strobe light sources which emit light simultaneously, and the light distribution characteristics of strobe light emitted from each of the strobe light sources. Is approximately 20 to 40 degrees, preferably 25 degrees, substantially symmetrically with respect to the center of irradiation by each of the strobe light sources.
It is characterized by being inclined at an angle of about 35 degrees, more preferably about 30 degrees.

[0006] Here, "the distribution of the highest intensity in the light distribution characteristics of the strobe light" refers to the distribution of the highest intensity in the direction in which the emission surface of the strobe light source faces. The “irradiation center of each strobe light source” is an irradiation point of strobe light substantially in the optical axis direction of a photographing lens in a camera using the strobe device of the present invention, that is,
This is a position substantially at the center of the imaging range of the camera.

In the strobe device of the present invention,
It is preferable that the irradiation light amount in a range of approximately 30 degrees on both sides with respect to the irradiation center is 80% or more of the maximum intensity.

Further, it is preferable to provide an angle changing means capable of changing the angle.

[0009]

According to the strobe device of the present invention, at least two strobe light sources are provided, and the maximum intensity distribution of the light distribution characteristics of the strobe light emitted simultaneously from each strobe light source is set to 20 degrees substantially symmetrically with respect to the irradiation center. To increase the amount of strobe light in the range of 20 to 40 degrees, which is approximately symmetrical with respect to the center of irradiation, compared to a conventional strobe device using only a single strobe light source. Can be. When only one strobe light source emits light, the amount of irradiation light decreases at the center of irradiation, but the amount of strobe light emitted from all strobe light sources is added to the center of irradiation. Therefore, a sufficient amount of light can be secured even at the irradiation center. Therefore, whether shooting using the above-described standard lens or shooting using a wide-angle lens, a sufficient amount of strobe light can be obtained over the entire shooting range, and as a result, It is possible to obtain a good photographed image without any.

Further, by making it possible to change the distribution angle of the maximum intensity of the strobe light, it is possible to optimize the light amount distribution of the strobe light according to the photographing range of the lens to be used.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a strobe device according to an embodiment of the present invention. As shown in FIG. 1, a strobe device according to an embodiment of the present invention has a first
And a second strobe light source 2 in combination. Each of the strobe light sources 1 and 2 has strobe bulbs 5A and 5B disposed in a space defined by lenticular lenses 3A and 3B formed by combining a plurality of lenses and reflectors 4A and 4B. . The intensity center lines X1 and X2 indicating the highest intensity in the light distribution characteristics of each of the strobe light sources 1 and 2 are each inclined by 30 degrees with respect to the irradiation center C. The irradiation center C refers to an irradiation point of strobe light substantially in the optical axis direction of a photographing lens in a camera using the strobe device of the present invention, that is, a substantially center position of an imaging range of the camera.

FIG. 2 is a diagram showing light distribution characteristics of the strobe device according to the embodiment of the present invention. As shown in FIG. 2, the distribution of the highest intensity in the light distribution characteristics of the strobe light is in the direction in which the emission surfaces of the strobe light sources 1 and 2 are directed. Although shown by the middle broken line, the light distribution characteristics obtained by combining the respective light distribution characteristics are shown by the solid lines in the figure. Therefore, as compared with the conventional light distribution characteristics shown in FIG. 5 described above, the strobe light amount in a range of about 30 degrees on both sides with respect to the irradiation center C can be greatly increased. The strobe light amount at the position and the 30-degree position can be about 90% and about 85%, respectively, with respect to the strobe light amount at the irradiation center.

Accordingly, even in the range of about 20 degrees on both sides of the optical axis of the lens, which is the shooting range of the standard lens of 50 mm, and the range of about 30 degrees on both sides of the optical axis of the lens, which is the shooting range of the wide-angle lens of 28 mm, A sufficient amount of strobe light can be obtained, whereby the periphery of the shooting range does not become dark, and a good shot image without whitening can be obtained.

In the above embodiment, the intensity center lines X1 and X2 indicating the highest intensity in the light distribution characteristics of each of the strobe light sources 1 and 2 are inclined by 30 degrees with respect to the irradiation center C. Is not limited to
The angle may be set to any angle within a range of 0 to 40 degrees, preferably 25 to 35 degrees. Further, in the above embodiment, the angle of the highest intensity distribution of the strobe light with respect to the irradiation center C is fixed, but may be changed in an arbitrary range from 20 degrees to 40 degrees. This makes it possible to optimize the light amount distribution of the strobe light in a camera having interchangeable lenses according to the shooting range of the lens to be used.

In the above embodiment, the two strobe light sources 1 and 2 are integrated to constitute a strobe device. However, as shown in FIG.
The two strobe light sources 1 and 2 may be provided separately.

Further, in the above embodiment, the strobe device is constituted by the two strobe light sources 1 and 2, but the strobe device may be constituted by using three or more strobe light sources. In this case, it is preferable to dispose each strobe light source such that the highest intensity distribution of the light distribution characteristics of the strobe light emitted from each strobe light source is symmetrical with respect to the irradiation center.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a strobe device according to an embodiment of the present invention.

FIG. 2 is a diagram showing light distribution characteristics obtained by a strobe device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a camera using a strobe device according to another embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional strobe device.

FIG. 5 is a diagram showing light distribution characteristics obtained by a conventional strobe device.

[Explanation of symbols]

 1, 2 Strobe light source 3A, 3B Lenticular lens 4A, 4B Reflector 5A, 5B Strobe bulb

Claims (4)

[Claims] 1. A strobe device comprising at least two strobe light sources that simultaneously emit light, wherein a distribution of a maximum intensity in a light distribution characteristic of strobe light emitted from each of the strobe light sources is determined with respect to a center of irradiation by each of the strobe light sources. A strobe device characterized by being substantially symmetrically inclined at an angle of 20 to 40 degrees. 2. The strobe device according to claim 1, wherein the angle is in a range of 25 degrees to 35 degrees. 3. The strobe light device according to claim 1, wherein an irradiation light amount in a range of approximately 30 degrees on both sides with respect to the irradiation center is 80% or more of the maximum intensity. 4. A strobe device according to claim 1, further comprising an angle changing means for changing said angle.