JPS61272728A - Flashing and illuminating device with variable irradiating angle - Google Patents

Abstract

PURPOSE:To vary the angle of irradiation to a subject side by arranging an optical member consisting of an optical elastic body in the front of a light emitting part and changing the shape of the optical member by shape regulating means to change the light diffusing property of passed light flux. CONSTITUTION:The optical member 4 with variable light diffusing property consists of a transparent optical elastic body such as silicone rubber. Plural minute lenses 4a are formed on the approximately same plane by transparent shape regulating means 4b having many fine openings and the shape of the minute lenses 4a is changed by pressing the optical member 4 or reducing the pressure of the member 4 by the shape regulating means 4b. Consequently, the light diffusing property of the optical member 4 is changed and the angle of irradiation can be changed continuously and rapidly.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a flash illumination device with a variable illumination angle, and particularly when used with a photographing system, the flash illumination device can be used to adjust the angle of view of the photographing system, distance to the subject, etc. This invention relates to a flash illumination ia with a variable irradiation angle that continuously changes the irradiation angle to provide efficient illumination.

(Prior art) Conventionally, in order to provide efficient illumination in a flash illumination device used together with a photographing system, the light source is adjusted according to changes in the photographing angle of view of the photographing system, that is, according to changes in the focal length of the photographing system or subject distance. It is desired to illuminate the subject side by changing the irradiation angle accordingly.

Various methods have been proposed in the past for changing the irradiation angle in a flash illumination device. For example, the front face of the light emitting part.
This is done by arranging diffuser plates with various light diffusing properties on the front panel, or by arranging 7 Lenel plates made of Y Lenel lenses with different optical powers.

Also, a reflecting mirror was placed behind the light emitting part, and the angle of arrangement of this reflecting mirror was varied.

However, in all of Nire et al.'s methods, it took a considerable amount of time to change the irradiation angle, and the entire device was large, making it mechanically difficult to change it continuously ◇ In particular, the imaging system was a zoom lens. In this case, it is preferable to change the irradiation angle quickly and continuously as the magnification changes, but this is difficult with conventional methods.

(Problems to be Solved by the Invention) An object of the present invention is to provide a flash illumination device with a variable illumination angle, which has a simple structure and is capable of rapidly and continuously changing the illumination angle.

A further object of the present invention is to provide a flash illumination device with a variable illumination angle, which can arbitrarily change the illumination angle in the horizontal and vertical directions and enable efficient illumination 8A.

(Means for solving the problem) When irradiating a subject with a light beam from a light emitting section, an optical member made of an optical elastic body is arranged in front of the light emitting section, and the shape of the optical member is controlled by a shape regulating means. By changing the light diffusivity of the passing light flux, the illumination angle toward the subject can be made variable.

The characteristics of which pond water invention are explained in the implementation PI.

(Example) FIG. 1 is a schematic diagram of an embodiment of the present invention.

In the figure, 1 is a light emitting part, 2 is a reflective umbrella, 3 is a heat insulating glass, and 4 is an optical member whose light diffusivity is variable. In this embodiment, it is made of a transparent optical elastic material such as silicone rubber. 5 is a Fresnel plate.

Figures 2 and 2 are explanatory views of the optical member 4 shown in Figure 1. Figure 2 is a plan view, ■ is a side view, and Figure 0 is a perspective view. . In the same figure, 4a Fi 1st
This is one of the microlens groups made up of the optical member 4 shown in the figure. In this embodiment, a plurality of microlenses 4& are formed on substantially the same plane by a transparent shape regulating means 4b having a large number of fine apertures, and the optical member 4 is pressurized or depressurized by the shape regulating means 4b. The shape of the microlens 4a is changed. 4c is a transparent member that houses the optical member 4 made of an optical elastic body.

In this embodiment, the optical member 4 is pressurized or depressurized by the shape regulating means 4b, and the refractive power of the minute lens 4a is variously changed by protruding or intruding an optical elastic body from the minute opening of the shape regulating means 4b. The light diffusivity of the light beam passing through the optical member 4 is changed.

Figure 3 (6) is an explanation of the light diffusivity of the light flux passing through the optical member 4t of this lens. FIG. 2(2) shows a case where the pressure applied to the optical member 4 by the shape regulating means 4b is reduced, the □ refractive power of the microlens 4a is reduced, and the light diffusivity is weakened. In contrast, ■ in the same figure shows the optical member 4 due to the shape regulating means 4b.
6 when the refractive power of the microlens 4 is increased and the beam diffusivity is strengthened.

In this way, in this embodiment, by controlling the pressing force of the shape regulating means 4b, a flash illumination device is achieved in which the light diffusivity of the optical member 4 can be changed and the irradiation angle can be changed continuously and rapidly. In this embodiment, the pressurizing force of the shape regulating means 4b is controlled by a mechanical force such as a pin from the photographing system side or an electric force such as a resistance or voltage value depending on the photographing angle of view of the photographing system, subject distance, etc. It is changed by □ means. In particular, when the imaging system is a variable magnification system, the illumination angle is continuously changed in conjunction with the variable magnification.

The shape of the large number of fine openings of the shape regulating means 4b shown in the embodiment of the face tree is not limited to a circle, but may be a circle, a square, a rectangle, etc., and the size of the openings may also be configured by mixing large and small ones. Then, it is 5K and 4JL to variously limit the irradiation angle.

FIG. 4(2), @, 0 is a schematic diagram of another implementation of a portion corresponding to the optical member 4 shown in FIG. 1.

In the figure, reference numerals 4 & □ and 4a3 denote a horizontal optical member and a vertical optical member each made of a transparent elastic material, each having a cylindrical shape. 4b and 4b3 are horizontal and vertical shape regulating means each having a lattice shape, and 4C2 is a holding frame.

In Fig. 4, the horizontal shape regulating means 4bzK pressurizes and controls the horizontal optical member 4a2 to change the optical member 4azt to a cylindrical shape, thereby changing only the refractive power in the horizontal direction and changing the horizontal direction of the light beam passing through. Changing the beam angle. Fig. 4 (6) shows a case where the vertical optical member 4aa is arranged in the vertical direction due to the same configuration as in Fig. 4. By changing the shape of the vertical optical member 4aa by the vertical shape regulating means 4b3, Changing the beam angle. FIG. 40 is an explanatory diagram when the horizontal and vertical optical members of the same figure and the same figure (B) are combined using a frame C2.

In this embodiment, both the horizontal and vertical optical members are integrally constructed, and by independently changing the shapes of both optical members, the irradiation angles in the horizontal direction and the vertical direction can be changed arbitrarily.

This K enables efficient illumination that corresponds to the size of the photographic screen.

(Effects of the Invention) According to the present invention, the illumination angle can be changed quickly and continuously, so a flash with a variable illumination angle can provide efficient illumination based on the focal length information and aperture information of the photographing system. Lighting device i! ct can be achieved. Further, according to the present invention, it is possible to achieve a flash illumination unit with a variable illumination angle that can change the illumination angle completely continuously with a simple configuration in which the member for variable illumination angle is small and there are few MJ parts. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the present invention, y; gz figure, 0
3), (C) is an explanatory diagram of a part of Fig. 1, Fig. 3 prisoner, @
is an explanatory diagram of the light diffusivity of a part of the light beam passing through in Fig. 1, and Fig. 4
The figure is an explanatory diagram of another embodiment of a part of FIG. 1. In the figure, 1 is a light emitting part, 2 is a reflective umbrella, 3Jd insulating glass, 4 is a Fi element material, 5 is a Fresnel plate, 4a is a microlens, and 4b is a shape regulating means.

Claims (3)

[Claims] (1) When irradiating the subject side with the light flux from the light emitting part, an optical member made of an optical elastic body is arranged in front of the light emitting part,
A flash illumination device with variable illumination angle, characterized in that the illumination angle toward the subject is made variable by changing the shape of the optical member using a shape regulating means and changing the light diffusivity of the passing light flux. (2) The optical member is configured such that a plurality of microlenses are formed on substantially the same plane by a shape regulating means, and the light diffusivity is changed by changing the refractive power of the plurality of microlenses. A flash illumination device with variable illumination angle according to claim 1. (3) The optical member is composed of two members: a horizontal optical member whose shape changes in the horizontal direction and a vertical optical member whose shape changes in the vertical direction, and by changing the shape of both members, the horizontal and vertical directions can be adjusted. A flash illumination device with a variable irradiation angle according to claim 1, characterized in that the irradiation angle is variable.