KR100793939B1 - A flash emitting device for decreasing a red-eye phenomenon in camera and a method - Google Patents

Abstract

The present invention relates to a flash light emitting device and a method for reducing red eye of a camera. According to an aspect of the present invention, there is provided a flash light emitting apparatus including: a switching unit including a release switch for selecting a first release stage and a second release operation and a shooting mode selection switch for selecting a shooting mode; A shooting mode display unit displaying a shooting mode of the subject; A measuring unit measuring a distance to a subject; A light metering unit measuring luminance of a subject; A controller which controls the ranger and the photometer and varies and outputs a frequency signal for preliminary light emission; A preliminary light emitting unit which emits light according to a first frequency signal output from the control unit; After the preliminary light emission of the preliminary light emitting unit is completed, a light emitting unit for emitting light suitable for photographing a subject by emitting from the second frequency signal output from the control unit, a flash unit having a charging unit for supplying the power accumulated so that the light emitting unit emits light It includes a drive unit.

The present invention can minimize the blur caused by the camera shake by immediately performing the main flash without time delay after the preliminary flash, and the red eye of the subject effectively by performing the preliminary flash to reduce the red eye according to the measured distance. You can shoot with reduced phenomenon.

Preliminary flash, red eye flash, flash

Description

Flash emitting device and method for reducing red eye of camera {A FLASH EMITTING DEVICE FOR DECREASING A RED-EYE PHENOMENON IN CAMERA AND A METHOD}

1 is a block diagram illustrating a red eye light emitting device of a camera according to a first embodiment of the present invention.

2A to 2B are waveform diagrams showing operating frequencies of the preliminary light emitting unit of FIG. 1.

3 is a flowchart illustrating a red-eye light emitting method of the camera according to the first embodiment of the present invention.

4A to 4B are waveform diagrams showing operating frequencies of the preliminary light emitting unit according to the second exemplary embodiment of the present invention.

5 is a flowchart illustrating a red-eye light emitting method of the camera according to the second embodiment of the present invention.

The present invention relates to a flash light emitting device and method for reducing the red-eye of the camera, and in particular, to accelerate the flash charging time without time delay after the flash of the camera flash, it is possible to minimize the blur caused by the camera shake of the photographer The present invention relates to a flash light emitting device and a method of a camera.

When photographing a subject using a camera or the like, the photographing state is determined according to the luminance state of the surrounding environment. When taking pictures indoors or at night, the ambient brightness is very low. Therefore, by using a flash unit that produces flashes that have almost the same characteristics as the sun rays with a large amount of light and a high color temperature for a very short time, It improves the ability to take pictures with adequate exposure.

Such a flash device generates an instant flash in conjunction with a shutter. When a low luminance flash is emitted to capture a person, red light is emitted by blood vessels in the eye when the optical axis of the flash light source enters the eye through the human pupil. RED-EYE PHENOMENON occurs when the pupil is reflected and the pupil is red.

Therefore, in order to prevent such a red-eye phenomenon, the photographing can be performed after the irradiation angle of the flash light source is dropped from the lens optical axis, or the enlarged pupil by using preliminary light emission is reduced to a small size by sudden flash.

As such, in order to prevent red eyes occurring when photographing a subject at night or in a dark place, a separate red eye prevention device is additionally installed in the camera. By the control device controlling the photographing operation of the camera, preliminary light emission is executed before the main photographing of the subject is performed to reduce the enlarged pupil when the main photographing is executed to prevent the red-eye phenomenon. When photographing a subject, the photographer arbitrarily selects a separate red-eye removal device to switch the shooting mode of the camera to the red-eye reduction mode.

Conventionally, a xenon tube for preliminary light emission and a xenon tube for main light emission are used as a method for preventing red eye, and one xenon tube is used for preliminary light emission and the other xenon tube is used for main light emission. As another method for preventing red eye, a preliminary light emitting diode and a lamp were used for preliminary light emission by using a single xenon tube separately from the preliminary light emitting capacitor.

As a method of continuously performing preliminary light emission, there is a method of preliminary light emission after a predetermined time interval of charging energy charged in a flash light emitting capacitor with one xenon tube and main light emission. In this case, an IGBT (Insulated Gate Bipolar Transistor) is used as a light emitting device.

By the way, in the conventional method for preventing red-eye phenomenon, since the main emission is always performed after a predetermined time has elapsed after the preliminary flash, the shooting time until the main flash is performed after the preliminary flash is necessary, and especially a human In the case of the subject, when the subject is preliminary light emission, the subject may be mistaken for the main emission, and eyes may be closed, or it may be determined that the photographing is finished. In addition, if the photographer lacks the concept of preliminary light emission to reduce the red-eye phenomenon, there is a problem that a camera shake phenomenon may occur by correcting the shooting posture by mistaking the operation of the camera during preliminary light emission as the main light emission.

In addition, among the conventional methods for preventing red eye, a method of preliminarily preliminarily emitting the charging energy charged in the flash light emitting capacitor by a predetermined time interval using a single xenon tube and then performing the main emission is a continuous preliminary method. Since the IGBT element is necessarily used for light emission, not only the circuit configuration of the light emitting unit is complicated, but also the cost of the component is expensive. In addition, since the flash must be fired more than once regardless of the distance, a certain amount of energy is required for the flash regardless of the distance, and thus the charging time is longer than that of the normal flash, not the flash for red-eye reduction. There was a losing problem.

In order to solve such a problem, the technical problem to be achieved by the present invention is to flash the preliminary light emission for red-eye reduction differently depending on the distance, to effectively reduce the red-eye phenomenon.

Another technical problem to be solved by the present invention is to minimize photo blur due to camera shake by immediately performing main light emission without time delay after preliminary light emission for red eye reduction.

Another technical problem of the present invention is to reduce the production cost by miniaturizing the circuit part by using a light emitting device having a low cost and a simple circuit configuration.

Flash emitting device for reducing the red eye of the camera according to an aspect of the present invention for achieving the above object

A flash light emitting device that uses a preliminary light emitting element to reduce a red-eye phenomenon that occurs when photographing a subject.

A switching unit having a release switch for measuring a distance to a subject and a luminance of the subject, a release switch for selecting a release two-stage operation for photographing a subject, and a shooting mode selection switch for selecting a shooting mode;

A shooting mode display unit displaying a shooting mode of the subject by the operation of the shooting mode selection switch;

A measuring unit for measuring a distance to a subject in one step of operation of the release switch;

A light metering unit measuring luminance of a subject by one step operation of the release switch;

Receives an operation signal of the release switch and outputs a control signal for controlling the ranger and the metering unit, outputs an operation signal to operate the shooting mode display unit, the frequency signal for operating the preliminary light emitting unit to the distance to the subject A control unit for outputting differently accordingly;

A preliminary light emitter which emits light according to a first frequency signal output from the controller in order to eliminate red eye occurring when a subject is photographed;

After the preliminary light emission of the preliminary light emitting unit is completed, the light emitting unit emits light by the second frequency signal output from the control unit to emit light suitable for photographing a subject, and the light emitting unit has a charging unit supplying power accumulated to emit light. Flash drive

It is made, including.

The preliminary light emitting unit may further include a preliminary light emitting diode and a resistor for controlling current of the preliminary light emitting diode.

Preferably, the first frequency signal has a higher frequency than the second frequency signal.

Flash emission method for reducing the red eye of the camera according to another aspect of the present invention

A flash light emitting method for reducing a red eye of a subject by using a flash device including a preliminary light emitting element of a camera and the light emitting element,

A photographer selecting a red-eye reduction photographing mode in the camera to perform a release switch 1 step to measure a distance to a subject and brightness of the subject;

Charging the flash by determining whether the measured brightness is the brightness at which the flash should emit light;

It is determined whether the distance to the subject is within a specific distance, and the blinking of the preliminary light emitting element is flickered with the first frequency signal. When the distance to the subject is greater than or equal to the specific distance, the flashing of the preliminary light emitting element is second. Flashing with a frequency signal;

After the flashing of the preliminary light emitting device is completed, operating the main light emitting device with a signal for driving the main light emitting device;

It is made, including.

In the specific distance determining step, if the distance to the subject cannot be determined, the method may further include determining that the distance to the subject is impossible and stopping the shutter operation.

Flash emission method for reducing the red eye of the camera according to another aspect of the present invention

A flash light emitting method for reducing a red eye of a subject by using a flash device including a preliminary light emitting element of a camera and the light emitting element,                     

A photographer selecting a red-eye reduction photographing mode in the camera to perform a release switch 1 step to measure a distance to a subject and brightness of the subject;

Charging the flash by determining whether the measured brightness is the brightness at which the flash should emit light;

It is determined whether the distance to the subject is within a first specific distance, and the blinking of the preliminary light emitting element is flickered with a first frequency signal, and when the distance to the subject is between the first specific distance and the second specific distance, Flashing the preliminary light emitting element with a second frequency signal and continuously performing preliminary light emission and the main light emission using the main light emitting element when the distance to the subject is greater than or equal to the second specific distance;

After the flashing of the preliminary light emitting device is completed, operating the main light emitting device with a signal for driving the main light emitting device;

It is made, including.

Hereinafter, with reference to the drawings will be described in detail the most preferred embodiment that can be easily implemented by those skilled in the art.

1 is a block diagram illustrating a red eye light emitting device of a camera according to a first embodiment of the present invention.

As shown in FIG. 1, a flash light emitting device for reducing a red eye of a camera according to a first exemplary embodiment of the present invention includes a release switch for measuring a distance to a subject and a brightness of a subject and selecting an operation of photographing a subject And a switching unit (100) having a shooting mode selection switch for selecting a shooting mode; A shooting mode display unit 200 which displays a shooting state according to an operation of a shooting mode selection switch; A ranging unit 300 for measuring the distance to the subject by the first step of the release switch; A light metering unit 400 which measures the brightness of the subject for photographing the subject by one step operation of the release switch; A frequency for operating the preliminary light emitting part by receiving an operation signal of the release switch and outputting a control signal for controlling the ranger 300 and the light metering part 400, outputting an operation signal to operate the photographing mode display part 200. A controller 500 that outputs a signal differently according to a distance to a subject; A lens driver 600 which receives a control signal of the controller 500 to move the photographing lens to capture a subject by a two-stage operation of the release switch; A preliminary light emitter 700 which emits light according to a constant frequency signal output from the controller 500 in order to eliminate red eye occurring when a subject is photographed; The charging unit 810 for storing and supplying energy stored to emit light, and the light emitting unit 810 and the charging unit 810 for emitting light suitable for photographing after the preliminary light emission of the preliminary light emitting unit 700 is completed. And a flash portion 800 having a xenon tube 830 that consumes energy to emit substantial light.

The release switch is a switch that is linked to a shutter button (not shown), and when the user presses the shutter button, the release switch is sequentially operated to the first release and the second release.

The controller 500 outputs a first frequency signal that the preliminary light emitter 700 may emit light, and outputs a second frequency signal that the light emitter 820 may perform main emission.

The preliminary light emitter 700 further includes a preliminary light emitting diode LED and a current control resistor R1, and operates by receiving a frequency signal output from the controller 500.                     

The charging unit 810 further includes a flash capacitor for accumulating energy to emit light.

2A to 2B are waveform diagrams showing operating frequencies of the preliminary light emitting unit of FIG. 1.

As shown in FIG. 2, the control unit 500 generates a frequency signal for performing a light emitting operation of the preliminary light emitting diode (LED), transmits the generated frequency signal to the preliminary light emitting unit 700, and the xenon tube of the flash unit 800. The 830 generates a flash trigger signal for performing the light emission and transmits the generated flash trigger signal to the light emission unit 820.

3 is a flowchart illustrating a red-eye light emitting method of the camera according to the first embodiment of the present invention.

Hereinafter, an operation of a flash light emitting device for reducing a red eye of a camera according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

When the photographer selects the red-eye reduction mode by pressing the shooting mode selection switch S3 to capture the subject (S100), a display indicating that the red-eye reduction mode is selected is displayed on the shooting mode display unit 200. From this point, the subject is shot in red-eye reduction mode.

When the first stage of the release switch S1 is pressed to take a picture in consideration of the photographing composition of the subject (S110), the distance measuring unit 300 measures the distance to the subject, and the metering unit 400 measures the luminance appropriate for capturing the subject. The brightness of the subject is measured to determine the recognition (S120). The measured distance to the subject and the brightness are input to and stored in the storage device of the controller 500 (not shown).

The resultant value of the luminance measured by the light metering unit 400 is input to the controller 500, and the controller 500 determines whether the luminance is to emit the flash (S130). It is determined through the charging unit 810 whether the flash charging is completed (S140). If it is not charged, it is charged in the flash capacitor of the charging unit 810 (S150).

The controller 500 determines whether the distance to the subject is within 3m by receiving the measurement result through the ranging unit 300 (S160), and depending on whether the release switch S2 is operated in two stages (S170). The preliminary light emitting diode (LED) of 700 is continuously blinked (S180). At this time, the light emission of the preliminary light emitting diode (LED) is flickered by the frequency signal output from the controller 500 as shown in FIG. 2A. The frequency signal for preliminary light emission output from the control unit 500 is 1/4 Hz, and the preliminary light emitting diode LED blinks by the frequency signal. The frequency signal for preliminary light emission can be adjusted by the controller 500. The frequency signal for preliminary light emission used in the present embodiment is 1/4 Hz, but is not limited to the embodiment of the present invention.

The preliminary light emitting diode used in the embodiment of the present invention uses a light emitting diode (LED), and the light emission uses a xenon tube 830. The xenon tube 830 used for the present light emission is a discharge lamp using high-pressure xenon gas, and the luminance at the time of light emission is very high. In addition, a low cost Silicon Controlled Rectifier (SCR) device is used as a flash trigger device. Here, the SCR element is a device that is used in a device for irradiating light by bonding the P-type and N-type portions alternately by using a silicon single crystal, and is attached to the electrode, and compared with conventional IGBT (Insulated Gate Bipolar Transistor) elements. The circuit configuration is simple and the price is low.

After the preliminary light emission ends, the control unit 500 outputs a flash trigger signal for operating the xenon tube 830 to perform the main light emission (S190). Flash emission is performed through the light emitting unit 810 using energy charged in a flash capacitor (not shown) of the charging unit 820, and the subject is photographed at the same time as the flash light is emitted (S200).

In the step of determining the distance to the subject (S160), if the distance to the subject is 3 m or more, the operating frequency of the red-eye reduction preliminary light emitting diode (LED) according to whether or not the second release switch is operated is 2 Output doubled and blink. That is, the controller 500 outputs a frequency signal of 1/2 Hz so that the preliminary light emitting diode (LED) blinks. As described above, the reason why the operating frequency of the preliminary light emitting diode (LED) for preliminary light emission at a short distance is larger than the operating frequency at a long distance is higher than that of a red eye phenomenon at a long distance and a preliminary light emitting diode at a long distance. If you flash (LED) quickly, the time interval for stimulating the pupil of the subject is short, so the effect of red-eye reduction can be maximized.

As a result of the ranging of the subject, if the subject is out of the distance to be photographed by flashing light, the control unit 500 determines that the ranging unit 300 cannot measure the distance to the subject (S240). In order to prevent the shutter from operating by performing the above, the photographer is reminded to check the target of the subject to be photographed (S250).

In the step of determining the flash light emission brightness (S130), if the photometric result of the subject to be photographed is not the flash light brightness, depending on whether the second release switch operation is performed (S260), the flash light is immediately executed and the camera is photographed (S190). ~ S200)

Hereinafter, a flash light emitting device and a method for reducing red eye of a camera according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

The flash light emitting device for reducing the red eye of the camera according to the second embodiment of the present invention is the same as that of the flash light emitting device of the first embodiment of the present invention, and among the configurations of the flash light emitting device according to the second embodiment, The same as that of the flash light emitting device of the first embodiment of the present invention is denoted by the same reference numerals, and a description thereof will be omitted below.

4A to 4B are waveform diagrams illustrating an operating frequency of a preliminary light emitting unit according to a second exemplary embodiment of the present invention, and FIG. 5 is a flowchart illustrating a red eye light emitting method of a camera according to a second exemplary embodiment of the present invention.

As shown in FIG. 4, in the red eye light emitting device and method of the camera according to the second embodiment of the present invention, the preliminary light emission for a subject located at a short distance within 3 m and a medium distance within 3 m to 5 m is performed by using a preliminary light emitting diode ( LED), and preliminary light emission for a subject located at a distance of 5 m or more is performed using a xenon tube. In particular, the charging capacitor for emitting light of the flash uses two charging capacitors, one for each of preliminary light emission and one for main light emission.

Hereinafter, the operation of the flash light emitting device for reducing the red eye of the camera according to the second embodiment of the present invention will be described.                     

When the photographer selects the red-eye reduction mode by pressing the shooting mode selection switch (S3) to shoot the subject (S300), the recording mode display unit 200 displays an indication that the red-eye reduction mode has been selected, and from this time on, the red-eye reduction mode is selected. Shoot the subject.

When the photographer presses the first stage of the release switch S1 (S310), the ranger 300 measures the distance to the subject, and the metering unit 400 measures the luminance of the subject to determine whether the luminance is suitable for photographing the subject. Measure (S320).

The resultant value of the luminance measured by the photometric unit 400 is input to the controller 500, and the controller 500 determines whether the luminance is to emit the flash (S330). It is determined through the charging unit 810 whether the flash charging is completed (S340). If it is not charged, it is charged in the flash capacitor of the charging unit 810 (S350).

The controller 500 determines whether the distance to the subject is within 3 m through the measuring unit 300 (S360), and determines whether the second stage operation of the release switch S2 is performed (S370), and reserves the preliminary light emitting unit 700. The light emitting diode (LED) is continuously blinked (S380). At this time, the light emission of the preliminary light emitting diode (LED) is flickered by the frequency signal output from the controller 500 as shown in FIG. 2A. The frequency signal for preliminary light emission output from the control unit 500 is 1/4 Hz, and the preliminary light emitting diode LED blinks by the frequency signal. The frequency signal for preliminary light emission can be adjusted by the controller 500. The frequency signal for preliminary light emission used in the present embodiment is 1/4 Hz, but is not limited to the embodiment of the present invention.                     

After the preliminary light emission ends, the control unit 500 outputs a flash trigger signal for operating the xenon tube 830 to perform the main light emission (S390). Flash emission is performed through the light emitting unit 810 using energy charged in a flash capacitor (not shown) of the charging unit 820, and the subject is photographed at the same time as the flash is emitted (S400).

In the step of determining the distance to the subject (S360), if the distance to the subject is within 3 m to 5 m (S410), depending on whether the release switch is operated in two stages (S420), an operation of the red-eye reduction light emitting diode (LED) is performed. The frequency is output at twice the operating frequency when within 3m to flicker (S430). That is, the controller 500 outputs a frequency signal of 1/2 Hz so that the preliminary light emitting diode (LED) blinks.

In the step of determining the distance to the subject (S360), if the distance to the subject is 5 m or more (S440), depending on whether the release switch is operated in two stages (S450), the preliminary light emission for red-eye reduction is performed by using the xenon tube 830. Is performed once (S460), and the present light emission is also performed using the xentone tube 830 (S390).

As a result of the ranging of the subject, if the subject is out of the distance to be photographed by flashing light, the control unit 500 determines that the ranging unit 300 cannot measure the distance to the subject (S470). In order to prevent the shutter from being operated (S480), the photographer is reminded to identify a target of a subject to be photographed.

In the step of determining the flash light emission luminance (S330), if the metering result of the subject to be photographed is not the flash light emission brightness, the light emission is immediately performed according to whether the release switch 2 is operated (S490) and photographing is performed.

In the embodiment of the present invention, many modifications and variations are possible without departing from the gist of the present invention. In particular, in the present invention, the preliminary emission operating frequency may be changed in order to maximize the red-eye reduction effect.

As described above, the flash light emitting device and method for reducing the red-eye of the camera of the present invention shortens the overall shooting time by performing the main flash immediately after the preliminary flash without any time delay, thereby minimizing the blurring of the photo caused by the camera shake. can do.

In addition, by performing the preliminary flash to reduce the red-eye according to the distance measured, not only can the subject be photographed with the effective red-eye reduction, but also compared to a device that emits only two flashes during the preliminary flash. The consumption of the charging energy is reduced, thereby shortening the charging time.

In addition, by using a low-cost device having a simple circuit configuration as the light emitting device for light emission of the present light emission, the circuit portion can be miniaturized to lower the production cost.

Claims (6)

A flash light emitting device using a preliminary light emitting element in order to reduce a red eye phenomenon occurring when photographing a subject, A switching unit having a release switch for measuring a distance to a subject and a luminance of the subject, a release switch for selecting a release two-stage operation for photographing a subject, and a shooting mode selection switch for selecting a shooting mode; A shooting mode display unit displaying a shooting mode of the subject by the operation of the shooting mode selection switch; A measuring unit for measuring a distance to a subject in one step of operation of the release switch; A light metering unit measuring luminance of a subject by one step operation of the release switch; Receives an operation signal of the release switch and outputs a control signal for controlling the ranger and the metering unit, outputs an operation signal to operate the shooting mode display unit, the frequency signal for operating the preliminary light emitting unit to the distance to the subject A control unit for outputting differently accordingly; A preliminary light emitter which emits light according to a first frequency signal output from the controller in order to eliminate red eye occurring when a subject is photographed; After the preliminary light emission of the preliminary light emitting unit is completed, the light emitting unit emits light by the second frequency signal output from the control unit to emit light suitable for photographing a subject, and the light emitting unit has a charging unit supplying power accumulated to emit light. Flash drive Flash emitting device for reducing the red eye of the camera comprising a. In claim 1, The preliminary light emitting unit And a preliminary light emitting diode and a resistor for controlling current of the preliminary light emitting diode. In the flash light emitting method for reducing the red-eye of the subject by using a flash device including a pre-light emitting device of the camera and the light emitting device, A photographer selecting a red-eye reduction photographing mode in the camera to perform a release switch 1 step to measure a distance to a subject and brightness of the subject; Charging the flash by determining whether the measured brightness is the brightness at which the flash should emit light; The preliminary light emitting device blinks with the first frequency signal by determining whether the distance to the subject is within a specific distance, and the preliminary light emitting device blinks with the second frequency signal when the distance to the subject is greater than or equal to the specific distance. Making; After the flashing of the preliminary light emitting device is completed, operating the main light emitting device with a signal for driving the main light emitting device; Flash emission method for reducing the red eye of the camera comprising a. In claim 3, The first frequency signal is Flash emission method for reducing the red eye of the camera, characterized in that having a higher frequency than the second frequency signal. In claim 3, The specific distance determination step If the distance to the subject cannot be determined, determining that the distance to the subject is impossible and stopping the shutter operation. In the flash light emitting method for reducing the red-eye of the subject by using a flash device including a pre-light emitting device of the camera and the light emitting device, A photographer selecting a red-eye reduction photographing mode in the camera to perform a release switch 1 step to measure a distance to a subject and brightness of the subject; Charging the flash by determining whether the measured brightness is the brightness at which the flash should emit light; It is determined whether the distance to the subject is within a first specific distance, and the blinking of the preliminary light emitting element is flickered with a first frequency signal, and when the distance to the subject is between the first specific distance and the second specific distance, Flashing the preliminary light emitting element with a second frequency signal and continuously performing preliminary light emission and the main light emission using the main light emitting element when the distance to the subject is greater than or equal to the second specific distance; After the flashing of the preliminary light emitting device is completed, operating the main light emitting device with a signal for driving the main light emitting device; Flash emission method for reducing the red eye of the camera comprising a.

Images