JPH06196004A - Spotlight - Google Patents

Abstract

PURPOSE:To keep an imaging state constant even when an illuminating point is moved to change the illuminating distance by detecting the illuminating direction according to the illuminating position, and regulating the illuminating angle according to the illuminating distance. CONSTITUTION:In a spotlight which is set in the rear of seats to illuminate a stage, a motor control device 10 for controlling its illuminating direction controls the vertical rotation of a motor M2 directly connected to a support shaft for vertically rotating a spotlight A. A potentiometer 13 mounted on the support shaft of the spotlight A detects the present illuminating direction (optical axis), and the information of the detected present position is fed back to a computing element 14. The motor control device 10 controls the optical axis of the spot light A so as to be situated in the position specified by the computing element 14. Namely, the detecting device for detecting the illuminating direction of the spotlight A is formed of the potentiometer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging system spotlight (for example, a cutter spotlight, a follow pin spotlight, a projector spotlight, etc.) for illuminating an actor (moving object) on the stage or stage of a theater. The present invention relates to a spotlight of an image forming system spotlight (for example, a single-piece spotlight, a lensless spotlight, etc.).

[0002]

2. Description of the Related Art On the stage of a theater or on the stage of various halls, a spotlight for projecting and illuminating the performers on the stage or stage is generally installed at a high place behind the second-floor seats to move the performers. If the irradiation point moves and the irradiation distance changes, the irradiation diameter, focus, etc. will change, so the irradiation diameter (imaging system spotlight or non-imaging system spotlight can be changed manually). ), The focus (only in the case of the image forming system spotlight) and the like had to be adjusted.

The irradiation diameter (φ) is determined by the irradiation distance and the irradiation angle, and the irradiation distance (L) is when the vertical distance from the spotlight to the irradiation point is (H) and the tilt angle is (θ). The irradiation distance (L) is represented by the following formula. L = H / sin θ Further, the irradiation angle (ε) in the spotlight has different parameters depending on the optical system, but in most cases, the light source,
It depends on the position of the lens and the opening of the iris shutter.

Further, in the so-called imaging system spotlight of the type that projects an aperture or an original image such as a follow pin spotlight, it is necessary to adjust the focus when projecting in addition to the adjustment of the irradiation diameter. The focus is determined by the projection distance (irradiation distance), and the adjustment is performed by adjusting the lens position. The relationship between the projection distance and the lens position differs depending on the lens configuration.

[0005]

Therefore, in the above-described conventional spotlight, it is considerably necessary to make the irradiation diameter of the performer projecting and irradiating the performer constant while keeping track of the performer's movement, and to perform focusing. As a matter of fact, it requires a lot of skill, and even the skilled person uses a lot of nerves in the adjustment. Therefore, the present invention has been made in view of the problems of the above-described conventional technique, and an object thereof is to keep the irradiation diameter constant even when the irradiation point moves and the irradiation distance changes, and the imaging state It is to provide a spotlight that automatically adjusts so as to keep constant.

[0006]

In order to achieve the above-mentioned object, the technical means taken by the present invention is a self-adjusting spotlight for keeping the irradiation diameter constant, which is an optical system part such as a light source (lamp), a lens and the like. Equipped with a drive mechanism that changes the relative position of the group, a detection device that detects the relative position of these optical system parts, and a detection device of the irradiation direction (tilt angle), and the relationship between the illuminated horizontal plane and the installation position of the spotlight. It is characterized by comprising a storage device for storing the height (vertical distance) and the relationship (function or actual measurement data) between the relative angle of the optical system component group in the spotlight and the irradiation angle.

Further, the spotlight which is automatically adjusted to keep the focus constant is a drive mechanism for changing the relative positions of optical system parts such as a light source (lamp) and a lens, and detection for detecting the relative positions of the optical system parts. Device, irradiation direction (tilt angle) detection device, storage device that stores the relationship (function or actual measurement data) between the relationship position of the optical system component group and the imaging distance, and the installation position of the illuminated horizontal plane and spotlight It is characterized by comprising a calculator for automatically calculating the irradiation distance from the relation height (vertical distance).

As the above spotlights for keeping the irradiation diameter constant, non-imaging system spotlights such as single-lens spotlights, lensless spotlights, and cutter spotlights, follow pin spotlights, projector spotlights, etc. Any image type spotlight may be used. Further, as a spotlight for keeping the focus constant, an image forming system spotlight is targeted.

Further, the driving mechanism for changing the relative position (light source-lens or light source-reflecting mirror) of the optical system parts in the non-imaging system spotlight is composed of a combination of a motor and a ball screw mechanism. The relative position between the two is configured to be detected by a detection device such as a linear potentiometer. Further, the irradiation direction detecting device is composed of a potentiometer attached to a support shaft for rotating the spotlight up and down, and the means for changing the irradiation direction is a drive control of a motor directly connected to the support shaft by an output of a motor control device. Either automatic control or manual control may be used.

Optical system component group (light source, reflecting mirror, lens group, iris shutter, etc.) in the image forming spotlight
The drive mechanism that changes the relative position (distance between lenses, distance between lens and iris shutter, etc.) is composed of a combination of a motor and a ball screw mechanism, similar to the case of the non-imaging system spotlight. The position is adapted to be detected by a detection device composed of a linear potentiometer or the like. Further, the irradiation direction detecting device has the same structure as that of the non-imaging system spotlight described above.

[0011]

The irradiation diameter of the spotlight is determined by the irradiation distance and the irradiation angle. When the vertical distance from the spotlight to the irradiation point is (H) and the tilt angle is (θ), the irradiation distance (L) is It is expressed by the formula. L = H / sin θ Moreover, the irradiation angle (ε) of the spotlight has different parameters depending on the optical system, but in most cases the light source,
The function or table data for determining the irradiation angle (ε) from these variables, which is determined by the position of the lens or the like and the opening of the iris shutter, can be obtained in the spotlight of each optical system. From the above data, ε = 2 × tan-1 (φ / 2 / L) = 2 × tan-1 {(φ / 2) × (sin θ / H)}, and the spot at the vertical distance (H) from the irradiation point Tilt angle (θ) to make the light the desired irradiation diameter (φ)
In this case, the irradiation angle may be set to (ε), and the irradiation angle (ε) can be derived from a function consisting of variables such as the position of the light source, the lens and the like and the opening of the iris shutter, or table data.

Therefore, according to the above means, the relational height (vertical distance) between the illuminated horizontal plane and the spotlight installation position and the relation between the relational position of the optical diameter component group and the irradiation angle in the spotlight are measured data. When the irradiation point moves and the irradiation distance changes, the irradiation direction (tilt angle) and the relative position of the optical system parts group are detected by the detection device when the irradiation distance changes and the vertical distance is the same plane. The irradiation distance can be calculated and calculated from the detected data, and the irradiation angle (ε) can be read out from the actual measurement database, and the irradiation diameter can be adjusted to be constant based on it.

The focus adjustment is determined by the projection distance (irradiation distance), and the adjustment can be performed by adjusting the lens position. The relationship between the projection distance and the lens position differs depending on the lens configuration, but since the projection distance is obtained by the method described above, it is possible to automatically control the focus by knowing the lens position data or function. Becomes

[0014]

Since the spotlight of the present invention is constructed as described above, the vertical distance from the irradiation point to the spotlight is preliminarily entered even when the irradiation point moves and the irradiation distance changes. Irradiation direction (tilt angle)
Since it is detected by the detection device, the irradiation diameter can be automatically adjusted so that the irradiation diameter is always constant on the same plane, and the focus can be adjusted automatically. Therefore, it is possible to eliminate the conventional inconvenience of manually adjusting the irradiation diameter and focus with the movement of the irradiation point, and since the adjustment is done automatically, the theater stage and various halls can be adjusted. Not only as a spotlight for an automatic tracking device that automatically tracks the movement of the performer on the stage, but it does not require any skill in the case of manual follow-up, and you can concentrate on following the irradiation point. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a hall in which a spotlight according to the present invention is installed. The spotlight A is arranged so as to illuminate an actor B on a stage D from above the rear portion of a second-floor seat C.

The spotlights used are non-imaging system spotlights such as the single-lens spotlight shown in FIG. 2 and follow-up spotlights such as the aperture or original image projection type shown in FIG. An image-based spotlight is exemplified, and the single-lens spotlight in FIG. 2 is composed of a light source 1, a lens 2, a reflecting mirror 3, and a lamp body 4, and the light source 1 is moved toward or away from the lens 2 by a driving mechanism. It is configured to be movable, and the relative position between the two is detected by a detection means such as a linear potentiometer.

The spotlight of FIG. 3 comprises a light source 5, a lens group 6, a reflecting mirror 7, an aperture 8 and a lamp body 9. The lens group 6 is movable by a drive mechanism, and The relative positional relationship between the lens groups 6 and the aperture 8 is configured to be detected by a detection device including a linear potentiometer and the like.

As shown in FIG. 1, the above-mentioned spotlight is installed in the rear of the passenger seat and illuminates the stage. A motor control device 10 for controlling the illuminating direction of the spotlight A is a spindle for vertically rotating the spotlight A. It controls the vertical rotation of the motor M ₂ which is directly connected, and the potentiometer 13 attached to the support shaft of the spotlight A detects the current irradiation direction (optical axis), and the detected current position information is a calculator. It is fed back to 14, and is controlled by the motor controller 10 so that the optical axis of the spotlight A comes to the position specified by the calculator 14. That is, the detection device for detecting the irradiation direction of the spotlight A is composed of the potentiometer 13.

Next, the irradiation diameter of the above-mentioned spotlight,
Explaining the focus adjustment, the irradiation diameter (φ) is determined by the irradiation distance (L) and the irradiation angle (ε). The spotlight A, which illuminates the performer B on the stage, is installed at a high place behind the audience seats. As shown in FIG. 4, the vertical distance from the illuminated horizontal plane to the installation position of the spotlight is (H),
When the tilt angle of the spotlight A is (θ), the irradiation distance (L) is represented by the following formula. L = H / SINθ Therefore, the installation position of spotlight A is decided,
If the vertical distance (H) is constant, the irradiation distance (L) can be calculated from the tilt angle (θ) on the same plane. The tilt angle (θ) can be detected by the potentiometer 13.

The irradiation angle (ε) of the spotlight A has different parameters depending on the optical system, but in most cases, the relative position between the light source (lamp) and the lens or the relative position between the light source (lamp) and the reflecting mirror. Determined by position. Then, their relative position (x) is detected by a detection device such as a linear potentiometer, and a function [ε = f for obtaining the irradiation angle (ε) from these variables is detected.
(x)] or table data (ε = actually measured database) can be obtained in the spotlight of each optical system. From the above data, ε = 2 × tan-1 (φ / 2 / L) = 2 × tan-1 {(φ / 2) × (sin θ / H)}, which is at the vertical distance (H) from the irradiation point. Tilt angle (θ) to make the spotlight an arbitrary irradiation diameter (φ)
In this case, the irradiation angle may be set to (ε), and the irradiation angle (ε) can be derived from the function [ε = f (x)] or table data (ε = measurement database).
Therefore, the irradiation diameter (φ) is φ = 2 · L · tan (ε / 2), and the irradiation diameter (φ) can be specified by adjusting the irradiation distance (L) and the irradiation angle (ε). . (See Figure 6)

The above is the irradiation diameter control in the case of the non-imaging system spotlight, but the irradiation diameter control of the imaging system spotlight is as shown in the explanatory view of FIG. Since the distance (s) between the lens and the aperture and the aperture diameter (φ ₁ ) are detected by the detection device, the irradiation diameter can be similarly controlled in the image forming system spotlight.

In a spotlight of a type that projects an aperture or an original image (cutter spot, follow pin spot, projector spot, etc.), focus adjustment is required when projecting, and the focus depends on the projection distance (irradiation distance). The lens position is adjusted. By the way, although the relationship between the projection distance and the lens position differs depending on the lens configuration, the projection distance (irradiation distance) is obtained by the above-described method, and therefore, the adjustment of the focusing can be performed by knowing the data or the function of the lens position. It can be done automatically.

Further, in the apparatus equipped with the above-mentioned irradiation diameter (φ) and focus adjusting mechanism, even if the vertical distance (H) from the illuminated horizontal plane to the spotlight installation position changes, the By calculating the irradiation diameter or finding the focus position (imaging distance), the irradiation distance (L) can be reversed from the position of the light source, lens, iris shutter, etc.
It is possible to calculate the vertical distance (H) to the installation position of the spotlight A, and by storing it in a storage device, the above-mentioned irradiation diameter can be applied to a spotlight installed arbitrarily. The focus can be controlled in the same manner.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an installation example of a spotlight according to the present invention.

FIG. 2 is an explanatory diagram of a single-lens spotlight.

FIG. 3 is an explanatory diagram of a follow pin spotlight.

FIG. 4 is an explanatory diagram showing a relationship among an installation height of a spotlight, a tilt angle, and an irradiation distance.

FIG. 5 is a schematic diagram of a control device that controls the irradiation direction of a spotlight.

FIG. 6 is an explanatory diagram showing control of an irradiation diameter of a non-imaging system spotlight.

FIG. 7 is an explanatory diagram showing control of an irradiation diameter of an imaging system spotlight.

[Explanation of symbols]

 A ... Spotlight 1,5 ... Light source 2,6 ... Lens (lens group) 3,7 ... Reflecting mirror 8 ... Aperture

Claims (2)

[Claims] 1. A drive mechanism for a related position of an optical system component group, a detection device for the related position, and a detection device for an irradiation direction,
The relationship height between the illuminated horizontal plane and the lamp installation position, and the relationship between the relationship position of the optical system group in the lamp and the irradiation angle are stored, the irradiation direction is detected according to the change of the irradiation position, and the irradiation distance is automatically calculated. The spotlight is characterized by adjusting the irradiation angle after calculation and automatically adjusting the irradiation diameter to keep it constant. 2. A relationship between a relational position of an optical system component group in a lamp and an imaging distance is stored, focus adjustment is performed according to an automatically calculated irradiation distance, and automatic adjustment is performed so as to maintain a constant imaging state. The spotlight according to claim 1, which is performed.