JP2704969B2 - Flash device and camera - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a flash device used for flash photography and a camera having the device.

BACKGROUND OF THE INVENTION It has been found that the red-eye effect is caused by the following principle.

The pupil inside the human eye is closed when looking at bright objects and open when dark. When a person is photographed using a strobe light at night or in a dark place, as shown in FIG. 4, the strobe light emitted from the strobe device 11 passes through the pupil 13 and reaches the retina 14 before being reflected. Pupil again
Go through 13 and go outside. At this time, it is said that the light reflected by the retina 14 is diffused and radiated within a range of ± 2 ° with the incident light as an axis. As shown in FIG. 4, when the lens 12 of the camera exists within a range of ± 2 ° from the axis connecting the strobe device 11 and the retina 14, the pupil appears red in the color of the capillaries of the retina 14. This is the red-eye phenomenon.

As a method for preventing the above-mentioned red-eye phenomenon, there is a method of increasing the distance between the lens 12 and the strobe device 11, as shown in FIG. However, in recent years, the opportunity to perform telephoto shooting has increased due to the high magnification zoom of compact cameras. In telephoto shooting, the distance between the camera and the subject is generally long.
Must be kept away from each other, and it becomes impossible to mount the strobe 11 on the camera, which impairs the portability of the compact camera.

Therefore, a method has been proposed in which preliminary irradiation is performed shortly before irradiation with strobe light to prevent the red-eye effect. This method uses the property that the pupil closes when a bright object is viewed, and closes the pupil by pre-irradiation, thereby narrowing the range of reflected strobe light that is emitted thereafter and preventing it from entering the camera lens. It is. There are the following methods for this.

1) Preliminary irradiation is performed with a xenon tube in a strobe device.

2) Preliminary irradiation is performed using another lamp.

The above 1) is a method in which a pre-irradiation capacitor and a switching circuit for switching between a circuit for pre-irradiation and a circuit for main light emission are loaded, and the above-mentioned 2) uses a lamp as a light-emitting body separate from the strobe device. This is a method of preparing and performing preliminary irradiation. However, these methods have the following disadvantages.

That is, in the method 1), the addition of a capacitor and a switching circuit complicates the circuit configuration and increases the cost. In the method 2),
Since a sufficient amount of light cannot be obtained because the amount of light emitted by the lamp alone is small, it is necessary to use a large lamp and the cost is increased. Further, the camera becomes large because a space for mounting the lamp is required.

In view of these points, a method in which a pre-irradiation lamp is inserted into a reflector to increase the amount of light emission has been proposed in Japanese Patent Application No. 1-31741 filed by the present applicant. In this method, a lamp is provided separately from the strobe device as in the above-mentioned method 2). However, in order to increase the amount of light emission without increasing the size, the lamp is inserted in the reflector of the strobe device. .

In this method, a xenon tube and a lamp are fixed in the reflector, but in this configuration, four lamps are attached to the reflector.
When a method of causing a xenon tube to emit light by applying a high-voltage trigger of about 5 KV is employed, it must be insulated and fixed to prevent leakage from the reflector to the xenon tube and the lamp.

FIG. 6 is a diagram showing an example of a configuration in which the xenon tube and the lamp are insulated and fixed to the reflector in consideration of the above points,
1 is a xenon tube emitting a strobe light, 2 is a xenon tube 1
A lamp, which is disposed in the reflector 1 and is used as preliminary irradiation for preventing red-eye, as described above, 3 is a reflector that reflects light emitted from the xenon tube 1 and the lamp 2, and 15 is a reflector that reflects the xenon tube 1. Reference numeral 16 denotes rubber for insulatingly fixing the shade 3, and reference numeral 16 denotes rubber for insulatingly fixing the lamp 2 to the reflective shade 3.

As is clear from this figure, in this method, since the distance between the reflector 3 and the xenon tube 1 and the lamp 2 is very short, insulation is provided to prevent leakage from the reflector 3 to the xenon tube 1 and the lamp 2. As described above, rubber 15,1
6 is used, but the rubber 15 that insulates and fixes the xenon tube 1 and the rubber 16 that insulates and fixes the lamp 2 are separate. Since the number of steps and the number of parts are increased, the cost is increased.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and emits a reflection shade for reflecting light from a discharge tube that emits light for flash photography in order to prevent a red-eye phenomenon. While commonly used to reflect the light from the light emitting means, in such a configuration that applies a trigger voltage for causing the discharge tube to emit light to the reflector, while achieving insulation retention of the discharge tube and the light emitting means, An object of the present invention is to provide a flash device and a camera capable of realizing cost reduction by reducing the assembly cost and the number of parts.

(Features of the Invention) In order to achieve the above object, the present invention provides a discharge tube that emits light for flash photography, a light emitting unit that emits light to prevent a red-eye effect, and a light emitted from the discharge tube. A reflector which is commonly used to reflect light and reflect light emitted from the light emitting means, and a voltage application circuit which applies a trigger voltage for causing the discharge vessel to emit light to the reflector. And a holding device for holding both the discharge tube and the light emitting device electrically insulated from the reflection shade.

(Embodiment of the Invention) FIG. 1 is a perspective view showing a main part configuration of an embodiment of the present invention. 6 are given the same reference numerals.

In FIG. 1, reference numeral 4 denotes an insulating rubber for fixing the xenon tube 1 and the lamp 2 to the reflection shade 3 respectively.
FIG. 2 shows the insulating rubber 4 before it is attached to the device.

The insulating rubber 4 has a shape obtained by integrating a rubber 15 for insulatingly fixing the xenon tube 1 and a rubber 16 for insulatingly fixing the lamp 2 in FIG. By using the insulating rubber 4 integrated in this manner, it is possible to prevent the leak from the reflector 3 to the xenon tube 1 and the lamp 2, and to reduce the number of parts, thereby reducing costs and assembling costs. ing.

FIG. 3 is a block diagram showing a schematic configuration of a camera having a built-in strobe device provided with the above-mentioned reflection shade 3, and FIG.
Is a battery as a power supply, 6 is a control circuit for controlling various operations of the camera, 7 is a lighting transistor of the lamp 2, 8 is a known DC / DC converter for boosting, and 9 is a light source for causing the xenon tube 1 to emit light. The main capacitor 10 for storing the energy of the trigger is a known trigger circuit.

In FIG. 3, the lamp 2 is connected between the emitter of the transistor 7 and GND. Since the lamp 2 is mounted on the reflection shade 3 and a trigger voltage to the xenon tube 1 is applied to the reflection shade 3, if a leak occurs from the reflection shade 2 to the lamp 2, other circuits and the like are not broken. In order to

According to this embodiment, since the insulating rubber 4 for insulatingly fixing the xenon tube 1 and the lamp 2 to the reflection shade 3 is formed by one member, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced. Can be achieved. In addition, it is expected that the manufacturing process can be simplified and the manufacturing efficiency can be improved (correspondence between the invention and the embodiment). In this embodiment, the xenon tube 1 is the discharge tube of the present invention, the lamp 2 is the light emitting means, and the trigger circuit 10 is the voltage. The insulating rubber 4 corresponds to the application circuit and the holding means, respectively.

(Effects of the Invention) As described above, according to the present invention, a reflector for reflecting light from a discharge tube that emits light for flash photography is provided by a light emitting unit that emits light to prevent a red-eye phenomenon. In a configuration in which the lamp is commonly used to reflect light and a trigger voltage for causing the discharge tube to emit light is applied to the reflector, the insulation cost of the discharge tube and the light emitting means is maintained, and the assembly cost is reduced. Also, it is possible to provide a flash device and a camera capable of realizing cost reduction by reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention, FIG. 2 is a perspective view of an insulating rubber shown in FIG. 1, and FIG. 3 is a schematic view of a camera incorporating a device of the embodiment of the present invention. 4 and 5 are diagrams for explaining a red-eye effect caused by flash photography, and FIG. 6 is a main part of a strobe device capable of preventing the red-eye effect which is a premise of the present invention. It is a perspective view which shows a structure. 1 ... xenon tube, 2 ... lamp, 3 ... reflective shade, 4 ...
... insulating rubber.

Claims (2)

(57) [Claims] A discharge tube for emitting light for flash photography, a light emitting means for emitting light to prevent a red-eye phenomenon, and a light emitting means for reflecting light emitted from the discharge tube and emitted from the light emitting means. A reflector that is commonly used to reflect light, a voltage application circuit that applies a trigger voltage for causing the discharge tube to emit light to the reflector, and a single member,
Holding means for electrically holding both the discharge tube and the light emitting means with respect to the reflection shade; 2. A discharge tube for emitting light for flash photographing, a light emitting means for emitting light to prevent a red-eye phenomenon, and a light emitted from the light emitting means for reflecting light emitted from the discharge tube. A reflector that is commonly used to reflect light, a voltage application circuit that applies a trigger voltage for causing the discharge tube to emit light to the reflector, and a single member,
A camera, comprising: holding means for electrically holding both the discharge tube and the light emitting means with respect to the reflector.