JPH0215249A - Illuminator for image pickup - Google Patents

Abstract

PURPOSE:To save power for an illuminator, to miniaturize a portable power source and to reduce its weight by synchronizing the lighting time and lighting period of the illuminator for image pickup with an image pickup device and controlling a lamp input to an appropriate value. CONSTITUTION:The photographing illuminator for image pickup is composed of the image pickup device 1, the illuminating power source 2 and a lamp 3. Signals (a) synchronous with image pickup are repeatedly outputted form the image pickup device 1. Moreover, an image pickup time (shutter speed) signal (b) and a received light quantity light signal (c) are outputted. Receiving these signals (a), (b) and (c), the illuminating power source 2 makes the lamp 3 emit light as shown by a waveform (d). The light emitting time is synchronous with the photographing frequency, and a brightly lighting time and the light emitting amount are controlled by the received light quantity signal determined by peripheral brightness, a diaphragm and a shutter speed, while a shutter is opened. Through the use of this illuminator, useless illumination apart from photographing time is omitted, and moreover illumination of quantity required for image pickup is carried out, whereby power can be saved further.

Description

[Detailed description of the invention] [Industrial field of use] The present invention relates to a lighting device for photography.

[Prior art] JP-A-57-8528 or JP-A-59-69032
As described in , it has already been done to stop a lighting device from emitting light using a light emission control signal, or to make it emit light in synchronization with a vertical synchronization signal of a TV system. However, although these conventional methods have yielded good results in terms of obtaining good images, they are not sufficient to reduce the power consumption of lighting devices.

[Problems to be Solved by the Invention] The above-mentioned conventional technology does not sufficiently reduce the power consumption of the lighting device, and has the disadvantage that the capacity of the power source becomes large, especially when lighting is performed using a portable power source.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the power consumption of a photographic illumination device, save power, and make a portable power source smaller and lighter.

[Means for Solving the Problems] The above object is achieved by synchronizing the lighting time and lighting cycle of the photography illumination device with the photography device, and by controlling the lamp input to an appropriate value.

[Function] The photographing lighting device according to the present invention receives a photographing time signal from the photographing device and a signal of a repeated photographing cycle, and lights up the device repeatedly in synchronization with the photographing device, and brightly illuminates the device during the photographing time. By setting the pulse width to emit light, you can use not only the light from the photographic lighting device, but also the light from general indoor lighting or natural light, especially at long shutter speeds. This has a great power saving effect when taking pictures. At the same time, since the photographing illumination device is operated only for the necessary time and with the necessary brightness, the effect of power saving is significant in this respect as well.

[Example] Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a photography lighting device according to the present invention, and FIG. 2 is a pulse timing chart in this embodiment.

In FIG. 1, 1 is a photographing device, 2 is an illumination power source, and 3 is a lamp. The photographing device 1 sends a signal synchronized with repeated photographing (a in Fig. 2, which becomes a vertical synchronization signal in a TV system), a photographing time (shutter speed) signal (b in the same figure), and a received light amount signal (a) in the TV system. C) in the same figure is output. The lighting power source 2 receives these signals a, b, and c,
The lamp 3 is made to emit light as shown in (d) in the same figure.

In other words, the flash cycle is synchronized with the shooting cycle, and the bright flash occurs while the shutter is open.Furthermore, the flash output is controlled by the received light amount signal, which is determined by the surrounding brightness, aperture, and shutter speed. Ru. Note that for lamps that have a time delay between lamp input and light emission, it is best to allow that time in advance before emitting light.

[Effects of the Invention] As described above, the lighting device for photography according to the present invention can further reduce power consumption by eliminating unnecessary lighting during times other than photography and by providing the amount of illumination necessary for photography. is achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an illumination device for photographing according to an embodiment of the present invention, and FIG. 2 is a pulse timing diagram in this embodiment. Explanation of symbols 1...Photographing device 2...Lighting power source Fig. 7(d)

Claims (1)

[Scope of Claims] 1. In a photographic illumination device comprising a light source and a power source that pulses the light source in response to a signal from a photographing device, the photographing time signal and the repeated photographing cycle signal from the photographing device are transmitted. A lighting device for photographing, characterized in that the device is repeatedly turned on in synchronization with the photographing device, and the pulse width is determined so that the device emits bright light during the photographing time. 2. The photographing illumination device according to claim 1, wherein the photographing illumination device adjusts lamp power based on a light reception signal from the photographing device.