JPH09133949A - Flash light emitting illuminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a red-eye phenomenon with small energy without giving a user an unnatural feeling caused by a situation that the flash light emission is executed or not executed by disregarding the intention of the user. SOLUTION: The luminance of a subject is measured by a photometry part 26, and a distance to the subject is measured by a range-finding part 24. When the luminance measured by the photometry part 26 is higher than a specified luminance value or the distance to the subject measured by the range-finding part 24 is longer than a specified distance, the emitted light quantity in the case of preliminary light emission is changed and set smaller than the normal one by a CPU 10. The preliminary light emission by a stroboscopic circuit 14 and a light emission part 12 is controlled by a light emission control part 16 based on the set emitted light quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flashlight illuminating device for preventing a red-eye phenomenon that occurs during flashlight photography.

[0002]

2. Description of the Related Art The red-eye phenomenon is a phenomenon in which a person's pupil is reproduced in red when a person shoots a color image from the front with a flash light source flashing. When the optical axis of the camera and the optical axis of the flash light source are close to each other. When the light from the flash light source enters the eyeball through the pupil, red light is reflected by the blood vessels in the eyeball, and the pupil part is reproduced in red.

Heretofore, various proposals have been made regarding a flash light emitting device for preventing such a red-eye phenomenon.
For example, according to Japanese Patent Application Laid-Open No. 1-235933, the brightness of a subject is obtained, and it is determined whether or not the obtained brightness meets the condition that red eye occurs. If it is not the condition that red eye occurs, pre-emission is prohibited. The method of doing is proposed.

Further, according to US Pat. No. 4,510,481, when an object is present at a long distance where light due to flash emission does not reach, flash emission is prohibited to prevent energy from being wasted. That method has been proposed.

[0005]

However, in the method disclosed in Japanese Patent Laid-Open No. 1-235933, the pre-flash is prohibited regardless of the user's will, even though the user sets the pre-flash. Therefore, there is a feeling of strangeness in operation. In particular, since the time from the start of pre-flashing to the start of main flashing for exposure is about 1 second,
There is a large difference in the release time lag between when the pre-flash is emitted and when the pre-flash is not emitted, and the user is very confused.

The method according to the above-mentioned US Pat. No. 4,501,481 also gives a strange feeling that the stroboscopic light emission is prohibited irrespective of the user's intention, and in some cases, it may be a strobe failure that the stroboscopic light does not shine. May be mistaken for.

Another problem is the problem of pre-emission when performing flat emission. Usually, when performing flat light emission, more energy is required than in normal flash light emission. Therefore, if the pre-light emission is performed before the flat light emission, energy is consumed by the pre-light emission, and sufficient energy for performing the flat light emission does not remain, and the flat light emission may become unstable. There is a nature.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and does not give the user an uncomfortable feeling due to the flash light emission being performed or not performed regardless of the user's intention. An object of the present invention is to provide a flash light emitting illuminator capable of preventing the occurrence of the red eye phenomenon with a small amount of energy.

[0009]

In order to achieve the above object, a flash light emitting illuminating device of the present invention comprises a main light emitting means having a flash light emitting tube for irradiating main irradiation light for illuminating a subject, and the main light emitting means. A flash light illuminating device comprising pre-light emitting means for irradiating the subject with sub-irradiation light as pre-emission prior to light emission of the flash light emitting tube by the light emitting means, the photometric means for measuring the brightness of the subject, Subject light emitting unit having at least one of distance measuring units for measuring the distance to the subject, and pre-emission light amount change for setting and changing the light emission amount of the pre-emission by the pre-light emitting unit according to the measurement result of the object measurement unit Means, and pre-light emission control means for controlling pre-light emission by the pre-light emission means based on the light emission light amount set by the pre-light emission light amount changing means. It is characterized in.

Further, in the flash light emitting device of the present invention, the discharge arc tube which emits the electric charge accumulated in the capacitor to emit light, and the main discharge of the discharge arc tube is preceded by the set pre-emission light quantity. At least one of the pre-flash control means for controlling the pre-flash, the photometric means for measuring the brightness of the subject, and the distance measuring means for measuring the distance to the subject.
And a determination means for determining whether or not the brightness measured by the photometric means is higher than a predetermined brightness value, or whether the distance to the object measured by the distance measuring means is longer than a predetermined distance. If the result of the determination by the determining means is that the brightness measured by the photometric means is higher than a predetermined brightness value, or if the distance to the subject measured by the distance measuring means is longer than the predetermined distance, the pre-flash control is performed. Means for changing the pre-emission light amount of the means to be smaller than usual and changing the pre-emission light amount.

Further, the flash-lighting illumination device of the present invention discharges the electric charge stored in the capacitor to emit light, and performs pre-light emission for red-eye prevention prior to main light emission of the discharge arc tube. The pre-light emission means, the pre-light emission control means for controlling the pre-light emission of the discharge arc tube according to the set light emission amount of the pre-light emission for the red eye prevention, and the mode for performing the flat light emission as the main light emission are set. A flat light emission setting means and a pre light emission light amount changing means for changing the setting of the light emission amount of the pre light emission of the pre light emission control means when the flat light emission mode is set by the flat light emission setting means. It is characterized by

That is, the flash light emitting device of the present invention is
A main light emitting means having a flash light emitting tube for irradiating a main irradiation light for illuminating a subject, and a pre-irradiating pre-light emitting as a sub light emission toward the subject as a pre light emission of the flash light emitting tube by the main light emitting means. In the flash light emitting device including a light emitting means, the brightness of the subject is measured by the photometric means, and the distance to the subject is measured by the distance measuring means.

Here, when the brightness measured by the photometry means is higher than a predetermined brightness value, or when the distance to the object measured by the distance measurement means is longer than the predetermined distance, the pre-emission light amount changing means is used to change the pre-emission light amount. The amount of emitted light is smaller than usual and the setting is changed. Then, based on the set amount of emitted light, the pre-emission control unit controls the pre-emission by the pre-emission unit.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A flash light emitting illumination device according to an embodiment of the present invention will be described below. FIG. 1 is a diagram showing a configuration of a camera to which a flash light emitting device according to an embodiment of the present invention is applied.

A camera to which the flash light emitting device is applied has a control unit (hereinafter referred to as CPU) 10 for controlling the operation of the entire camera, a light emitting unit 12 for irradiating a subject with light, and a light emitting unit 12 for emitting light. A strobe circuit 14 for controlling the light emission, a light emission control part 16 for controlling the light emission of the light emitting part 12 through the strobe circuit 14, an aperture control part 18 for controlling the aperture, and a film for controlling the winding and rewinding of the film. The control unit 20, a shutter control unit 22 that controls the operation of the shutter, a distance measuring unit 24 that measures the distance to the subject, and a photometric unit 26 that measures the brightness of the subject.

FIG. 2 is a circuit diagram of a flash light illuminating device including the CPU 10, the light emitting unit 12, the strobe circuit 14, and the light emission control unit 16 shown in FIG. The CPU 10 for controlling the operation of the flash light illuminating device includes a power supply battery E1, a main capacitor C5, a power supply filter circuit 32, a strobe boosting power supply circuit 34, and a voltage detection circuit 36 for detecting a charging voltage of the main capacitor C5. A series circuit of a trigger circuit 38, a flash discharge tube (Xe tube) 40, a diode D5 and a gate control type switching element (hereinafter referred to as an IGBT) 42 is connected in parallel.

The power supply filter circuit 32 includes a power supply battery E.
It is composed of a capacitor C1 connected in parallel with 1, and a diode D1 connected between the positive side of the capacitor C1 and the positive side of the power supply battery E1.

The step-up power supply circuit 34 has a resistor R1.
A series circuit of R2 and R2, transistors Q1 and Q2 and a resistor R4 connected in parallel with the power supply battery E1, a diode D2, a capacitor C2 and a transformer T connected in parallel.
1, the transistor Q3 connected to the primary side of the transformer T1, the resistor R3 connected between the transistor Q3 and the resistor R4, and the resistor R5 and the diode D3 connected to the secondary side of the transformer T1. , As shown.

The voltage detecting circuit 36 includes resistors R6 and R6.
7 series circuit, a capacitor C4 connected in parallel with the series circuit, and a diode D4 connected between the capacitor C4 and the main capacitor C5.

Further, the trigger circuit 38 has a resistor R8.
, R9 and R10, thyristor SCR1, capacitors C6 and C7, resistor R11, and trigger transformer T2 are connected as shown. This trigger transformer T2 is
A trigger is applied to the flash discharge tube 40. IGB
T42 is connected in series with the flash discharge tube 40 and the diode D5. The IGBT 42 switches the light emission current to the flash discharge tube 40 and controls the amount of light emission, and operates according to the state of the SCONT signal from the CPU 10.

A power switch SW1 and a release switch SW2 are connected to the CPU 10.
SC supplied from the CPU 10 to the IGBT 42
In addition to the ONT signal, the CHG signal is supplied to the boosting power supply circuit 34.
The voltage detection circuit 36 is supplied with the VST signal, and the trigger circuit 38 is supplied with the STRG signal.

The CPU 10 controls the flash light emitting illumination device, and the power supply VDD of the CPU 10 is supplied from the power supply battery E1 through the power supply filter circuit 32.
Here, before explaining the operation of the flash light emitting illumination device,
The IGBT will be described.

FIG. 3 is a diagram showing a sectional structure of a general IGBT. As shown in the figure, a P layer 52 and an N layer 54 are sequentially formed on the upper side of the collector electrode 50. Then, on the surface of the N layer 54, a P layer 56 having a lower impurity concentration than the P layer 52 and an N layer having a higher impurity concentration than the N layer 54 are formed.
Layer 58 is formed. The surface of the P layer 56 sandwiched between the N layer 54 and the N layer 58 serves as a channel region.

A gate oxide film 6 is formed on the channel region.
The gate electrode 62 is formed via 0. An emitter electrode 66 is formed on the gate electrode 62 with an insulating film 64 interposed therebetween.

In the IGBT thus constructed,
When a positive voltage is applied to the gate electrode 62 with respect to the emitter electrode 66, the above-mentioned channel is formed, and the collector electrode 50
-A current flows between the emitter electrodes 66. The voltage applied to the gate electrode 62, so-called gate voltage, is usually 10V.
The gate oxide film 60 requires a voltage of about -40V.
By adopting the thinning and miniaturization design rule, it is possible to manufacture an IGBT capable of flowing a sufficient collector-emitter current even when the gate voltage is 4V.
The present embodiment describes a flash light emitting illumination device using this low voltage gate drive IGBT.

Next, with reference to the timing chart shown in FIG. 4, the basic operation of the flash light emitting illumination device will be described. Now, when the CHG signal is set to low level (Fig. 4
(A)), the boosting power supply circuit 34 operates, and the boosted voltage is charged in the main capacitor C5 (FIG. 4 (b)).
This charge voltage is monitored by the voltage detection circuit 36, and when it reaches a predetermined charge voltage (FIG. 4C), the CHG signal is set to the high level to stop the boosting operation.

Next, regarding light emission, in order to turn on the IGBT 42 prior to the light emission start signal, SCONT
The signal is set to high level (FIG. 4 (d)). Then, in response to the light emission start signal, the STRG signal becomes high level (FIG. 4 (e)), the thyristor SCR1 is turned on, and the trigger circuit 38 excites the flash discharge tube 40 to start light emission (FIG. 4). (F)). After that, when the SCONT signal is set to the low level during light emission, the IGBT 42 is turned off and the light emission of the flash discharge tube 40 is stopped.

FIG. 5 shows a C for outputting the SCONT signal.
It is a circuit diagram of the output part of the CONT terminal inside PU10.
This output section includes a NAND circuit 70, a NOR circuit 72, an inverter 74, a P-channel (P-ch) transistor 76 and an n-channel (N-ch) transistor 78.
It is configured as shown in FIG. Then, when the transistor 76 is turned on and the transistor 78 is turned off, the voltage VDD is output to the CONT terminal. Also, the transistor 7
When 6 is off and the transistor 78 is on, the ground level voltage is output.

Here, when the power source E1 is a 6V battery, VDD drops to about 5.5V by VF of the diode D1. At that time, since the high-level voltage output to the CONT terminal has a voltage drop of the transistor 76,
It is about 5.3V. Here, since the low voltage drive IGBT is used for the IGBT as described above, 5.
Even with a voltage of 3V, the IGBT is sufficiently turned on.

The timing at which the IGBT is turned on before the above-described light emission start signal, that is, the high-level timing of the SCONT signal may be any time before the STRG signal is input, or may be at the power-on of the flash light emitting illumination device or the camera. Alternatively, it may be when it is determined that strobe light emission is necessary at low brightness. Further, it may be when the release is pressed or when the mirror is raised in the SLR.

Next, a flash light emitting illumination device of a modified example of the embodiment according to the present invention will be described. FIG. 6 is a circuit diagram of a flash light emitting illumination device according to a modified example of the embodiment.

The configuration of this flash light emitting illumination device is similar to that of the circuit of the flash light emitting illumination device shown in FIG.
1 is added, that is, the voltage application by the SCONT signal to the gate of the IGBT 42 is applied to the buffer U
1 is performed. The other configurations are the same as those in the above-described embodiment, and thus the description is omitted here.

Since the buffer U1 is provided in this way, the gate drive current to the IGBT 42 increases and the IG
The BT42 can be turned on and off at high speed. Next, with reference to the timing chart shown in FIG. 7, the basic operation of the flash light emitting illumination device will be described. FIG.
(G) is an enlarged view of a portion of the SCONT signal shown in (d) of FIG. 9 which is represented by time t2.

When the CHG signal is set to the low level, the boosting power supply circuit 34 operates and the boosted voltage is charged in the main capacitor C5. The received voltage is monitored by the voltage detection circuit 36, and when it reaches a predetermined charging voltage, the CHG signal is set to high level to stop the boosting operation.

Next, regarding the light emission, when the STRG signal and the SCONT signal are set to the high level in response to the light emission start signal, the IGBT 42 is turned on and, at the same time, the flash discharge tube 40.
Is excited by the trigger circuit 38 to start emitting light. S
The CONT signal outputs a high / low level pulse train at a very fast cycle. Then, the IGBT 42 also repeats on / off at the same cycle. Once in the excited state, the flash discharge tube 40 can repeat a small light emission by turning on / off the IGBT 42 without triggering the trigger circuit 38 again, and can realize a substantially flat light emission.

When this flat light emission is used, a strobe can be used even in slit exposure in a camera using a focal plane shutter, and high speed strobe synchronization can be realized.

Further, in the flash light illuminating device shown in FIGS. 2 and 6, it is possible to perform normal pre-light emission for reducing the red-eye phenomenon. The operation of this pre-emission will be described with reference to the timing chart shown in FIG.

When the CHG signal is set to the low level, the boosting power supply circuit 34 operates and the boosted voltage is charged in the main capacitor C5. This charging voltage is monitored by the voltage detection circuit 36, and when it reaches a predetermined charging voltage, the CHG signal is set to a high level to stop the boosting operation.

Next, regarding light emission, when the STRG signal and the SCONT signal are raised to high level in response to the light emission start signal, the flash discharge tube 40 is excited by the trigger circuit 38 to start light emission. Then, when the SCONT signal is set to the low level after the time tw, the light emission is stopped. Small light emission corresponding to this time tw is repeated at intervals of several tens of ms for about 1 second, and then main light emission for photographing is performed.

The normal flash light emission, the flat light emission, and the pre-light emission for red-eye prevention have been described above. Next, the minute pre-light emission for red-eye prevention, which is a feature of the present invention, will be described. FIG. 9 is a flowchart showing the processing of the CPU 10 as the operation of the minute pre-light emission for red eye prevention.

First, the CPU 10 releases the release switch SW.
It is determined whether 2 has been pressed (step S1). When the release switch SW2 is pressed, photometry is performed (step S2), and the obtained photometric value BV is stored in the memory in the CPU 10 (step S3). On the other hand, when the release switch SW2 has not been pressed, it waits until it is pressed.

Next, the distance to the subject (subject distance)
(Step S4), and the obtained object distance DV is C
It is stored in the memory in the PU 10 (step S5). Next, the CPU 10 determines whether or not it is in the red-eye prevention mode (step S6). In the red-eye prevention mode, it is determined whether the photometric value BV is larger than the predetermined value BVT (step S7). Here, the predetermined value BVT is a photometric value corresponding to a predetermined high brightness, and is a photometric value corresponding to the lowest subject brightness at which the red-eye phenomenon does not occur. Above photometric value B
If V is larger than the predetermined value BVT, the process proceeds to step S9, and if not, the subject distance DV is the predetermined value DV.
It is determined whether it is larger than T (step S8). Here, the predetermined value DVT is a value corresponding to the farthest distance where the light emitted from the discharge arc tube 40 reaches the subject.

In step S8, the subject distance D
If V is larger than the predetermined value DVT, the process proceeds to step S9, and if not, the process proceeds to step S10. That is, when it is determined in step S7 that BV> BVT is satisfied and the brightness of the subject is higher than the above-mentioned minimum brightness at which the red-eye phenomenon does not occur, the human pupil is small and the red-eye is small. Occurrence rate is low. Therefore, in step S9, in order to make the pre-light amount in the pre-light emission small, the time tw that is the pre-light emission time is set to a time twmin shorter than tw, and the process proceeds to step S10.

In step S8, DV> DV
When T is satisfied and the subject distance DV is determined to be so far that the light emitted from the discharge arc tube 40 does not reach,
The size of the subject's eyes in the photograph is also very small. Therefore, even if a red eye occurs, it does not pose a problem for a photograph. Therefore, in step S9, in order to make the pre-light amount in the pre-light emission small, the time tw is set to a time twmin shorter than tw, and the process proceeds to step S10. To do.

Next, in step S10, the CPU 1
0 starts pre-emission, and when time tw has elapsed (step S11), stops emission (step S12). In steps S10 to S12, one pre-emission is completed.

Subsequently, it is determined whether or not the predetermined number of pre-flashes has been reached (step S13). If the predetermined number of pre-flashes has not been reached, the process returns to step S10 and the processes of steps S10 to S13 are repeated. Then, when the predetermined number of times of pre-light emission has been reached, main light emission for exposure is performed (step S14), and the main processing ends.

When it is determined in step S6 that the red-eye prevention mode is not in effect, the processes of steps S7 to S13 are not performed, and the main light emission is performed in step S14, and the process is terminated.

FIG. 10 is a diagram showing the light emission waveforms of the above-described minute pre-emission and normal pre-emission. FIG. 10A is a diagram showing a light emission waveform of normal pre-light emission, and FIG. 9B is a diagram showing a light emission waveform in the case of a minute pre-light emission. The minute pre-emission has a considerably shorter emission time and smaller emission brightness than the normal pre-emission.

As described above, according to the present embodiment, pre-light emission is minutely performed under high brightness where red-eye is unlikely to occur and at a long distance where strobe light does not reach, thereby consuming energy by wasted pre-light emission. It can be lost.

Further, in the present embodiment, since the minute light emission is performed without prohibiting the pre-light emission, it is possible to let the user recognize that the pre-light emission for preventing the red eye is being performed. In the above-described embodiment, the main light emission is not particularly controlled, but the main light emission can also be made to be a minute light emission to eliminate waste of emission energy when the subject distance is a long distance. Further, in the above-described embodiment, whether or not the pre-emission is made minute is controlled by the luminance information and the distance information, but the present invention is not limited to this. In the case of light emission that is supposed to be used and uses a large amount of light emission energy to perform light emission, the pre-light emission before this light emission may be unconditionally made to be small.

In the above embodiment, the pre-light emission and the main light emission are performed by the same discharge arc tube, but the same applies when a separate discharge arc tube, a lamp, an LED or the like is provided for the pre-light emission. Can be obtained.

According to the above-described embodiment, when the subject has a high brightness or a long distance, by making the pre-light emission for red-eye prevention and the main light emission for exposure minute, the waste of energy due to these light emission is wasted. It can be eliminated, and further, unlike when the light emission is prohibited, the user does not feel uncomfortable such that the pre-light emission is not performed regardless of the user's intention.

According to the above embodiment of the present invention, the following configuration can be obtained. (1) A discharge arc tube that emits light by discharging an electric charge stored in a capacitor, and a pre-light emission control unit that controls pre-light emission of the discharge arc tube according to a set amount of pre-light emission light for red-eye prevention. If the brightness by the photometric means is higher than a predetermined value, or if the subject distance by the distance measuring means is farther than a predetermined value, the photometric means for measuring the brightness of the shooting scene, the distance measuring means for measuring the distance to the subject, And a pre-emission light amount changing means for setting and switching the pre-emission light amount of the pre-emission control means to be smaller than usual. (2) In accordance with the set discharge arc tube that emits light by discharging the electric charge stored in the capacitor, the pre-light emitting unit that performs the pre-light emission for the set red-eye prevention, and the set pre-light emission amount for the red-eye prevention, When the pre-light emission control means for controlling the pre-light emission of the discharge arc tube, the photometric means for measuring the brightness of the shooting scene, the distance measuring means for measuring the distance to the object, and the brightness by the photometric means being higher than a predetermined value Alternatively, when the subject distance by the distance measuring means is farther than a predetermined value, a pre-emission light amount changing means for setting and switching the pre-emission light amount of the pre-emission control means to a setting smaller than usual is provided. apparatus. (3) In accordance with the set discharge arc tube which emits the electric charge stored in the capacitor to emit light, the set pre-light emitting means for performing pre-light emission for red-eye prevention, and the set pre-light emission amount for red-eye prevention. A pre-light emission control means for controlling the pre-light emission of the discharge arc tube, a flat light emission setting means for setting a mode for performing flat light emission, and a pre-light emission control means for the pre-light emission control means when the flat light emission mode is set. A flash emission lighting device, comprising: a pre-emission light amount changing means for setting and switching a light amount smaller than usual. (4) Flash light including a main light emitting means having a flash light emitting tube for irradiating the main irradiation light for illuminating the subject, and a pre-light emitting means for irradiating the subject with the sub irradiation light prior to the light emission of the main light emitting means. In the light emitting illumination device, a subject measuring unit having at least one of a photometering unit for measuring the brightness of the photographed subject and a distance measuring unit for measuring the distance to the subject, and the measurement result of the subject measuring unit Pre-emission light amount changing means for setting and switching the pre-emission light amount of the pre-emission means, and pre-emission control means for controlling the pre-emission light amount of the pre-emission means to the pre-emission light amount set by the pre-emission light amount changing means. A flash-lighting illumination device characterized by comprising. (5) Flash light including main light emitting means having a flash light emitting tube for irradiating main irradiation light for illuminating a subject, and pre-light emitting means for irradiating the subject with secondary irradiation light prior to light emission of the main light emitting means. In the light emitting illuminating device, a flat light emission setting means for setting a mode for performing flat light emission different from the normal light emission as the main irradiation light; And a pre-emission light amount changing means for setting and switching the pre-emission light amount of the pre-emission control means to be smaller than that for the normal pre-emission. (6) The flash light emitting illuminator according to any one of (4) and (5), wherein the main light emitting means and the pre-light emitting means irradiate with light emitted from the flash light emitting tube. (7) The main light emitting means irradiates by the light emission of the flash light emitting tube, and the pre-light emitting means irradiates by the light emission of an illumination device different from the flash light emitting tube. (4) or (5) 2. A flash light emitting device according to any one of 1. Flash emission lighting device. (8) The flash light emitting device according to any one of (4) to (7), wherein the pre-light emitting means performs pre-light emission for preventing red eye. (9) A determination unit that determines whether or not the subject distance is longer than a predetermined distance based on the output of the distance measurement unit that measures the distance to the subject in the subject measurement unit, and the result of the determination unit is the distance measurement unit. When the subject distance is larger than a predetermined value, the pre-emission control unit switches the pre-emission light amount to a smaller value than that during the normal pre-emission, and the main emission light amount of the main emission light is set to the normal emission light amount. The flash emission lighting device according to (4) above, further comprising: a light emission control unit that controls the setting by switching the setting to be smaller than the light emission. Flash emission lighting device.

[0054]

As described above, according to the present invention, the red-eye effect can be prevented with a small amount of energy without giving the user an uncomfortable feeling that the flash light emission is performed or not performed regardless of the user's intention. It is possible to provide a flash light-emitting illumination device that can prevent the occurrence.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a camera to which a flash light emitting device according to an embodiment is applied.

FIG. 2 is a circuit diagram of a flash light emitting illumination device including a CPU 10, a light emitting unit 12, a flash circuit 14, and a light emission control unit 16 shown in FIG.

FIG. 3 is a diagram showing a cross-sectional structure of a general IGBT.

FIG. 4 is a timing chart showing a basic operation of the flash light emitting illumination device.

FIG. 5 is a C inside the CPU 10 that outputs a SCONT signal.
It is a circuit diagram of the output part of an ONT terminal.

FIG. 6 is a circuit diagram of a flash light emitting illumination device according to a modification of the embodiment.

FIG. 7 is a timing chart showing a basic operation of the flash light emitting device.

FIG. 8 is a timing chart showing a normal pre-emission operation.

FIG. 9 shows C as an operation of a minute pre-light emission for preventing red eye.
It is a flow chart which shows processing of PU10.

FIG. 10 is a diagram showing emission waveforms of the minute pre-emission and normal pre-emission.

[Explanation of symbols]

10 ... Control unit (CPU), 12 ... Light emitting unit, 14
... Strobe circuit, 16 ... Emission control section, 18 ... Aperture control section, 20 ... Film control section, 22 ... Shutter control section, 2
4 ... Distance measuring unit, 26 ... Photometric unit, 32 ... Power supply filter circuit,
34 ... Step-up power supply circuit, 36 ... Voltage detection circuit, 38 ... Trigger circuit, 40 ... Flash discharge tube (Xe tube), 42 ... Gate control type switching element (IGBT), 50 ... Collector electrode, 52 ... P layer, 54 ... N layer, 56 ... P layer having low impurity concentration, 58 ... N layer having high impurity concentration, 60 ... Gate oxide film, 62 ... Gate electrode, 64 ... Insulating film, 66 ... Emitter electrode, 70 ... NAND circuit, 72 ... NOR Circuits, 74 ... Inverters, 76 ... P-channel (P-ch) transistors, 78 ... N-channel (N-ch) transistors.

Claims (3)

[Claims] 1. A main light emitting means having a flash light emitting tube for irradiating a main irradiation light for illuminating an object, and a sub irradiation light as a pre light emission to the object prior to light emission of the flash light emitting tube by the main light emitting means. In a flash light emitting illuminating device including pre-light emitting means for irradiating toward a subject, a photometric means for measuring the brightness of the subject, and a subject measuring means having at least one of distance measuring means for measuring the distance to the subject. The pre-emission light amount changing means for changing the setting of the pre-emission light amount of the pre-emission light by the measurement result of the object measuring means, and the pre-emission light amount changing means for setting the pre-emission light amount A flash emission lighting device comprising: a pre-emission control unit that controls pre-emission by the light emission unit. 2. A discharge arc tube that emits light by discharging the electric charge stored in a capacitor, and a pre-flash that controls the pre-flash so that the pre-flash emits light at a preset amount of light before the main discharge of the discharge arc tube. Control means, photometric means for measuring the brightness of the subject, subject measuring means having at least one of the distance measuring means for measuring the distance to the subject, and the brightness measured by the photometric means is higher than a predetermined brightness value. Whether or not the distance to the subject measured by the distance measuring means is longer than a predetermined distance, and the result of the determination by the determining means is that the brightness measured by the photometric means is a predetermined brightness value. When it is higher, or when the distance to the subject measured by the distance measuring means is longer than a predetermined distance, the pre-emission light amount of the pre-emission control means is set to be higher than usual. Flashlight illumination apparatus comprising: the pre-emission light quantity changing means for changing fence setting, the. 3. A discharge arc tube that emits light by discharging electric charge stored in a capacitor, pre-light emitting means that performs pre-light emission for red-eye prevention prior to the main light emission of the discharge arc tube, and the set-up described above. Pre-emission control means for controlling the pre-emission of the discharge arc tube according to the amount of pre-emission light for red-eye prevention, flat emission setting means for setting a mode for performing flat emission as the main emission, and the flat emission When the flat light emission mode is set by the setting means, a pre-emission light amount changing means for changing the pre-emission light amount of the pre-emission control means to be smaller than usual, and a flash light emitting illumination characterized by the following: apparatus.