JPS63155132A - Lighting method - Google Patents

Abstract

PURPOSE:To light a subject brightly when the quantity of light is adjusted by adjusting the output of the incandescent lamp of a lighting fixture whose discharge tube output is adjusted to the maximum output among lighting fixtures to a preset output which is as large as possible while holding the output ratio among respective discharge tubes equal to the output ratio of respective incandescent lamps. CONSTITUTION:A ratio dimming circuit 5 has a reception part which receives a light quantity ratio signal from a momentary light quantity ratio decision circuit 4, a decision part which selects a maximum light quantity ratio signal, and an output part which adjusts the outputs of incandescent lamps of respective lighting fixtures so that they are proportional to the outputs of the discharge tubes, and is equipped with a setting part which maximizes the output of a reference incandescent lamp. Then the outputs of the incandescent lamps 3 in the respective lighting fixtures 1 are connected to a dimming circuit 6, which is controlled. This control is carried out by increasing the output of the incandescent lamp 3 of the lighting fixture whose discharge tube output is adjusted to the maximum output to the preset output which is as large as possible while the output ratio among the respective discharge tubes 2 is held equal to the output ratio among the respective incandescent lamps 3. Consequently, the respective incandescent lamps are made to illuminate brightly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to illumination and a method for illuminating during photography.

<Prior Art> In photo studios and in photography that requires a large amount of light, a large electronic flash device is used to illuminate a subject. FIG. 3 shows the configuration of an electronic flash device used for such conventional lighting methods.

This electronic flash device consists of a power supply unit 31 and a lamp 32. The lamp 32 includes a discharge tube 33 such as a xenon discharge tube that emits instantaneous light during shooting, and a constant light source for observing the light distribution state with the naked eye. An incandescent light bulb 34 that emits light is provided. Further, the power supply unit 31 includes a capacitor 35 that stores energy for instantaneous light emission, and a triac 3 that changes the constant light according to the energy.
6, and a control circuit 37 that adjusts the illuminance of the instantaneous light and the constant light so that they are proportionally different.

When photographing, one or more of these lamps are used to illuminate the subject, but before photographing, the lamps are properly placed and the light intensity is adjusted using constant light. In this scene adjustment, since it is impossible to judge the light distribution state with the naked eye with the instantaneous light from the discharge tube 33, a bulb 34 is used to emit incandescent light with an output proportional to the instantaneous light. Observe the three-dimensional effect, texture, etc. and predict the state that will be reproduced on film.

At this time, in order to appropriately set the aperture value of the camera, it is often necessary to lower the overall illuminance of the instantaneous light.

In this case, a dimming method is usually used in which the illuminance of each stationary light is reduced while maintaining the same ratio of the illuminance between the stationary lights of each lamp and the illuminance of the instantaneous lights of each lamp.

Next, an example of light N adjustment will be explained with reference to FIG.

In the figure, 41 is a camera that casts an image of the subject 42, and 43 is a back screen. light! , 44, 45° 46 and 4
Four units 7 are arranged around the subject 42. The discharge tubes of all lamps 44, 45, 46 and 47 have maximum output,
That is, the maximum accumulated power amount is 120 (1, s), and the output can be adjusted within a range up to 1/32 of this.

On the other hand, the incandescent bulbs in each of the lamps 44, 45, 46, and 47 are, for example, halogen lamps, and discharge tubes capable of outputting a maximum output of 200 W at a maximum output of 120 (US) are used. (not shown) is used to set the film sensitivity to the subject 42.
100. When the aperture of the lens of the camera 41 is F8 and the output of the electronic flash is adjusted, the output of each discharge tube of each lamp and the output of each incandescent bulb linked thereto will be as shown in Table 1 below.

(Left below) <Problems to be solved by the invention> However, in the method described above, the illuminance of instantaneous light instantly releases the charging energy of the capacitor and emits light with high brightness, whereas the illuminance of constant light is delayed. There is a considerable difference between the level of illuminance of instantaneous light and the level of illuminance of steady light of each lamp due to reasons such as the fact that the lamp emits light in a typical manner and structural limitations of the lamp. Another problem was that when the illumination intensity was lowered, the range visible to the naked eye became dark, making it impossible to recognize Ta with the naked eye.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an illumination method that can brightly illuminate a subject when adjusting the amount of light.

Means for Solving Problems> To achieve the above object, the present invention provides a geometric dimming method that increases the illuminance of constant light at a set ratio regardless of the illuminance of instantaneous light. It is.

That is, the lighting method according to the present invention maintains the output ratio of each discharge tube at the same rate as the output ratio of each incandescent bulb, and adjusts the output of the incandescent bulb of the lamp whose discharge tube output has been adjusted to the maximum among the above-mentioned lamps. , special effects are adjusted to achieve a preset maximum output.

<Function> The brightness of the incandescent bulb of each lamp is adjusted to brighten the overall brightness in proportion to the output of the incandescent bulb of the lamp whose discharge tube output is adjusted to the maximum output is adjusted to the preset maximum output. This makes it easier to check the shadow condition of the subject with the naked eye.

<Examples> The present invention will be specifically described below with reference to illustrative examples.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. This example shows a case where four lamps 1 are installed, and each lamp 1 includes a discharge tube 2 that emits instantaneous light during shooting, and a discharge tube 2 that emits constant light to adjust the scene before shooting. There are also 3 incandescent light bulbs. Here, as the discharge tube 2, for example, a xenon discharge tube is used, and as the incandescent light bulb 3, for example, a halogen lamp is used. Each light fixture 1
The discharge tube 2 is an instantaneous destination light amount ratio discrimination circuit 4 during instantaneous light emission.
, and an equal proportional optical circuit 5 is connected to the instantaneous destination light amount ratio discrimination circuit 4 . The instantaneous destination light amount ratio discrimination circuit 4 is
For example, a charging circuit (not shown) as shown in FIG. 3, a capacitor 35. A control circuit 37 is used, and a proportional device (not shown) for comparing the light amount of each discharge tube 33 is used.

The geometrical dimming circuit 5 adjusts the output of the incandescent light bulb 3 in each lamp 1 to yJv! The light control circuit 6 is connected to the light control circuit 6 to control the light control circuit 6. As this geometrical dimming circuit 1155, software means such as a microcomputer is used to control the dimming circuit 6. Such control maintains the output ratio of each discharge tube 2 at the same rate as the output ratio of each incandescent bulb 3, and adjusts the output of the incandescent bulb 3 of the lamp whose discharge tube output is adjusted to the maximum to a preset maximum value. This is done by adjusting it to produce a large output. For this reason, the equal proportional light circuit 5 includes a receiving section that receives the scene ratio signal from the instantaneous destination light amount ratio discriminating circuit 4, a determining section that selects the maximum Ω light amount ratio signal, that is, the maximum accumulated power amount, and the incandescence of each lamp. It has at least an output section that adjusts the output of the light bulb so that it is proportional to the output of the discharge tube, and further includes a setting section that can maximize the output of the incandescent light bulb that serves as a reference.

In Fig. 1, 7 is an interlocking circuit for interlocking the discharge tube 2 and incandescent bulb 3 of each lamp 1, and 8 is a switch for switching between a method in which the discharge tube output and incandescent bulb output are proportional and an equal proportion light method. .

Next, an example of adjusting the amount of light using the above configuration will be described with reference to FIG. 2. In the figure, 21 is a camera, 22 is a subject, and 23 is a back screen.

Reference numerals 24, 25, 26, and 27 are lamps, and these are arranged in the same arrangement as in Fig. 4, and each lamp 24, 25° 26, 27
(7) The maximum output of each group m tube is x200W, s.

The maximum output of each incandescent light bulb installed is 200W. In this state, I adjusted the scene while looking at the shadow of the subject, and adjusted the output of each discharge tube to 150W, S.

Set to 75 items S, 37.5W, S, 37.5W, S.

Next, among the discharge tubes at this time, the one whose output is adjusted to the maximum output can set the output of the incandescent bulb of the lamp 24 to the preset value t! This is a large output, i.e. the maximum output of this incandescent bulb 2
Adjust to 00W. At the same time, if the output of the other incandescent bulbs is adjusted so that the output ratio between the incandescent Ti bulbs is maintained at the same rate as the output ratio between the respective discharges, the output of each incandescent bulb will be as shown in Table 2 below.

(Left below) Comparing this with Table 1, we can see that the output of each incandescent bulb has improved overall, and since it is colored -C, the subject becomes brighter and the condition of the subject can be confirmed with the naked eye.

In this example, the reference output when adjusting the light amount was set to the maximum output of an incandescent light bulb whose discharge tube output was adjusted to the maximum, but it may be less than the maximum output, and it may be used for other lamps. The brightness of the incandescent bulb may be proportionalized manually.

Also, the number of lamps, output values, etc. can be changed as appropriate.

<Effects of the Invention> As described above, according to the present invention, the output of the reference incandescent bulb is adjusted to a preset maximum output while keeping the output ratio of each discharge tube at the same rate as the output ratio of each incandescent bulb. Since the adjustment is made so that each incandescent bulb is lit brightly, it becomes extremely easy to confirm the subject with the naked eye.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a layout diagram for imaging using the same embodiment, Fig. 3 is a block diagram showing the configuration of a conventional example, and Fig. 4 is the same. It is a layout diagram for photographing. 1.24, 25, 26, 27・Lighting equipment, 2-Discharge tube, 3.Incandescent light bulb, 5.Geometric dimming circuit Patent applicant Comet Co., Ltd. Representative Patent attorney Akira Sato: 42) ¥1 S' 24 Kaya 3) ffi top

Claims (1)

[Claims] One or more lamps equipped with a discharge tube that emits instantaneous light and an incandescent bulb that emits constant light are used, and the output of the discharge tube of each lamp is adjusted to illuminate the subject. In the lighting method, while keeping the output ratio of each discharge tube at the same rate as the output ratio of each incandescent bulb, the output of the incandescent bulb of the lamp whose discharge tube output has been adjusted to the maximum among the above-mentioned lamps is adjusted to the preset maximum level. A lighting method characterized by adjusting to have a large output.