JPH10177854A - Flashing device and flash photographic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize an arc position at the initial time of light emission and a light irradiation direction so as to eliminate causes for uneven irradiation and an unstable light emission output to a subject by providing a trigger electrode positioned in the inner diameter side of an electric discharge tube and on the shortest line connecting two electric discharge electrodes together. SOLUTION: A trigger electrode 4 of a conductor is disposed in the inner diameter side of an arc-shaped electric discharge tube and on a shortest line connecting the positive and negative electrode side terminals of an electric discharge tube 5, and set to be shorter in width than the half circumferential length of the electric discharge tube 5. Since the trigger electrode 4 is disposed on a shortest line connecting the positive and negative electrode side terminals A and B of the electric discharge tube 5 and set to be shorter in width than the half circumferential length of the electric discharge tube 5, ionization occurs along the trigger electrode 4 after the electric discharge tube 5 starts light emission and arc electric discharge produces an arc 1 along an ionized part. The arc 1 is produced to the shortest distance between the positive electrode and the negative electrode to stabilize an arc position without receiving fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash device and a flash photographing device, and more particularly to an arrangement position of a trigger electrode for stabilizing a light emitting arc position of a circular arc discharge tube and eliminating irradiation unevenness of light emission. Things.

[0002]

2. Description of the Related Art In a conventional flash device, the position of an arc in a flash discharge tube is generally not stable during the initial period of light emission, for example, several tens of microseconds from the start of flash light emission, or when the peak value of light emission output is low. For this reason, when the amount of emitted light is small, the arc position in the discharge tube glass tube and the direction of light irradiation are not stable, causing irradiation unevenness on the film. Also, in a system in which emitted light is detected by a light-receiving sensor provided in the vicinity of the light-emitting portion and the emitted light is controlled based on the detection result, the arc position in the discharge tube glass tube even when the detection and control system operates normally. Is not stable, the irradiation direction of the light is not stable, which causes inconsistencies in the irradiation on the film and the instability of the light output as viewed from the subject.

[0003] In order to solve these inconveniences, a light emitting section of a conventional flash device as shown in FIG. 6 has been proposed.
In the figure, reference numeral 101 denotes a linear flash discharge tube. Reference numeral 102 denotes a transparent conductive electrode as a trigger electrode applied to a part of the outer surface of the glass tube of the linear cylindrical discharge tube 101, and is applied in a strip shape in the longitudinal direction of the discharge tube. Reference numeral 103 denotes a reflection shade, and the discharge tube 101 is arranged on the bottom (bottom) side, and a surface facing the discharge tube is a mirror surface, and determines an irradiation angle from the discharge tube 101. Reference numeral 104 denotes an arc immediately after the start of discharge, and shows a state along the trigger electrode 102.

In the flash device of FIG. 6 having such a configuration, a transparent conductive electrode as a trigger electrode is applied in a strip shape on the outer wall of the glass tube of the discharge tube 101, so that the trigger discharge at the time of applying the trigger is performed along the trigger electrode. To be generated,
An arc discharge that is generated subsequent to the trigger discharge is also generated along the trigger electrode 102 like an arc 104 shown in FIG. 6 to stabilize the position of the light-emitting arc and to eliminate inconveniences such as uneven irradiation.

[0005]

However, when the above-mentioned technique is applied to a circular light emitting portion using an arc discharge tube used in a strobe for close-up photography, the following disadvantages occur.

The reason will be described with reference to the drawings. FIG.
(A) shows the relationship between the arc discharge tube and the reflector. Although not shown in FIG. 7A, a panel 207 shown in FIG. 7B is provided on the front surface of the discharge tube 201. FIG.
FIG. 7B shows a cross section taken along the dotted line in FIG. Discharge tube 20
When a trigger is applied to the trigger electrode 1, a trigger discharge occurs
7B, an initial discharge arc is also generated along the trigger electrode at a portion 205 showing the arc in FIG. 7B.
However, the arcs generated were anode 202 and cathode 203
7B, it moves from the portion 205 showing the arc shown in FIG. 7B to the portion 206 immediately after the arc is generated, and the initial arc is not stabilized.

An object of the first invention according to the present application is to provide a flash device which can easily stabilize the arc position at the initial stage of light emission of an arc discharge tube and can eliminate irradiation unevenness.

A second object of the present invention is to provide a flash photographing apparatus capable of stabilizing the position of a light-emitting arc when performing light-emission intensity control by flat light-emitting even if an arc-shaped discharge tube is used. It is in.

A third object of the present invention is to provide a flash photographing apparatus capable of stabilizing the position of a light-emitting arc when controlling a light-emitting amount even when an arc-shaped discharge tube is used.

[0010]

A first configuration for realizing the object of the first invention according to the present invention is an arc-shaped discharge tube having discharge electrodes to both ends of which a charge stored in a capacitor is applied. And a trigger electrode provided on the discharge tube, wherein the trigger electrode is provided at a position on the inner diameter side of the discharge tube at least including a line connecting the two discharge electrodes in the shortest distance. A flash device characterized in that:

In this configuration, the trigger electrode may have a width shorter than a half circumference of the discharge tube.
The discharge tube may have a semicircular arc or an annular shape.

[0012] A configuration for realizing the object of the second invention according to the present application comprises an arc-shaped discharge tube provided with discharge electrodes to both ends of which a charge stored in a capacitor is applied; A trigger electrode provided at a position including at least a line connecting the two discharge electrodes in the shortest distance between the two discharge electrodes, a first light receiving element for receiving light emitted from the discharge tube, and a first light receiving element; Control means for controlling the light intensity of the emitted light to be substantially constant based on information received by the light receiving element.

[0013] A configuration for realizing the object of the third invention according to the present application includes an arc-shaped discharge tube provided with discharge electrodes to both ends of which a charge stored in a capacitor is applied; A trigger electrode provided at a position including at least a line connecting the two discharge electrodes in the shortest distance between the two discharge electrodes, a second light receiving element for receiving light emitted from the discharge tube, and the second Control means for controlling the amount of emitted light based on information received by the light receiving element.

In the configuration for realizing the objects of the second and third aspects, the trigger electrode may have a width shorter than a half circumference of the discharge tube.

In the structure for realizing the objects of the second invention and the third invention, the discharge tube may be formed in a semicircular arc or an annular shape.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 5 show a first embodiment of the present invention.

FIG. 1 is a structural view of a main part of a flash photographing apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along a dotted line shown in FIG. 1, and FIG. FIG. 4 is a block diagram applied to the reflex camera, FIG. 4 is a flowchart of the operation of the camera unit shown in FIG. 3, and FIG. 5 is a flowchart of the operation of the flash unit shown in FIG.

In FIG. 1, 2 is an anode of a discharge tube 5, 3 is a cathode, 4 is a trigger electrode, and 5 is a discharge tube. Reference numeral 6 denotes a reflection shade whose surface facing the discharge tube 5 is mirror-finished.

FIG. 2 is a sectional view taken along the dotted line in FIG. FIG.
, 1 is an arc at the initial stage of discharge of the discharge tube 5 described later. Although not shown in FIG. 1, a transparent panel 7 is provided on the front surface of the discharge tube 5. Reference numeral 8 denotes a surface provided on an end face of the panel 7 for guiding emitted light to the light receiving element 9. 9 is the first
And receives a part of the light from the discharge tube 5 through the panel 7 and the surface 8.

Reference numeral 10 denotes a surface provided on the end face of the panel 7 for guiding the emitted light to the light receiving element 11, and reference numeral 11 denotes a second light receiving element for transmitting a part of the light from the discharge tube 5 to the panel 7, Received via 12a and 12b are a pair of protrusions for supporting the discharge tube 5 provided on the reflector 6. Each point ABCDEFG in the figure is a block diagram of a camera described later.
Each operating point corresponds to ABCDEFG.

Here, a transparent trigger electrode 4 which is a conductor
Is arranged on the inner diameter side of the discharge tube 5 formed in an arc shape, including a line connecting the anode terminal A and the cathode terminal B of the discharge tube 5 in the shortest distance. Is also short. The trigger electrode 4 may be a wire. In this case, the anode terminal A and the cathode terminal B of the discharge tube 5 are used.
It will be arranged on the line connecting the shortest.

As described above, the trigger electrode 4 is arranged so as to include the shortest line between the anode terminal A and the cathode terminal B of the discharge tube 5 and has a width shorter than a half circumference of the discharge tube 5. When the light emission of the discharge tube 5 starts, ionization due to the operation of the trigger circuit occurs along the transparent trigger electrode 4 shown in FIG. 2, and the subsequent arc discharge follows the ionization portion as shown in the arc 1 in FIG. Occurs. Since the arc is generated at the shortest distance between the anode 2 and the cathode 3, the arc does not fluctuate and the position of the arc is stabilized.

In FIG. 3, reference numeral 41 denotes a power supply battery on the flash device side, and reference numeral 42 denotes a booster circuit, which charges the main capacitor 43 to about 300 V from the power supply battery 41. Step-up circuit 42
Is a port P5 of a microcomputer FPU57 described later.
, The booster circuit 42 operates with a high input and becomes inactive with a low level input. 44,4
Reference numeral 5 denotes a series-connected resistor, which is connected in parallel to the main capacitor 43, and the connection point is connected to the port P7 of the FPU 57.

Reference numeral 46 denotes a well-known trigger circuit of the flash discharge tube 5, and when a high-level signal is applied to the input terminal Ti,
A high-frequency high voltage is applied to the trigger electrode 4 of the flash discharge tube 5 from the output terminal TO to ionize the inside of the discharge tube 5 and start light emission. A coil 47 is connected to the positive terminal of the main capacitor 43 and the anode terminal A of the discharge tube 5. Reference numeral 5 denotes the above-mentioned flash discharge tube, which discharges the electric charge stored in the main capacitor 43 and converts it into light energy. Reference numeral 49 denotes a diode. The anode is connected to the cathode terminal B of the discharge tube 5 and the cathode is connected to the positive pole of the main capacitor 43.

Reference numeral 50 denotes a known flash control circuit, and an input terminal S
When a high-level signal is applied to I1 or SI2, the state becomes conductive, and when a low-level signal is applied, the state becomes non-conductive. The input terminal SI3 of the flash control circuit 50 is connected to F
The signals from the port P1 of the PU 57 are used to set SI1, SI2
Is controlling the input.

A comparator 53 has a negative input to the output terminal IO of the integration circuit 51 and a positive input to the FPU 57.
Output to the input terminal S of the flash control circuit 50
I1 and the port P8 of the FPU 57. The comparator 54 also has a negative input to the output terminal KO of the light intensity detection circuit 52, a positive input to the port P2 of the FPU 57, and an output to the input terminal SI2 of the flash control circuit 50.
Connected to

The integrating circuit 51 integrates the photocurrent of the light receiving element 9 and outputs a voltage corresponding to the integrated value to an output terminal IO. The input terminal II of the integration circuit 51 is connected to the port P6 of the FPU 57, and starts an integration operation when a high level signal is input, and stops integration when a low level signal is input. The light intensity detection circuit 52 outputs a voltage proportional to the photocurrent of the light receiving element 11 to the output terminal KO. Input terminal K of light intensity detection circuit 52
I is connected to the port P10 of the FPU 57, and starts a detection operation when a high level signal is input, and stops the detection operation when a low level signal is input.

As shown in FIG. 1, the light receiving elements 9 and 11 are arranged near the reflection shade 6 of the flash discharge tube 5 and
Is configured to directly receive the emitted light. The microcomputer FPU57 on the flash device side has nine ports and a terminal group FL1, and the terminal group FL1 is a terminal group CL1 of a microcomputer CPU61 of a camera unit described later.
And a plurality of signal lines. Reference numeral 18 denotes an operation start switch for turning on / off the flash device.

Next, a camera-side circuit, 61 is a camera-side microcomputer CPU, 62 is shutter control means having a terminal group SL, and the terminal group SL is connected to the terminal group CL11 of the CPU 61 via a plurality of signal lines. Connected.
Reference numeral 63 denotes aperture control means having a terminal group AL. The terminal group AL is connected to the terminal group CL2 of the CPU 61 via a plurality of signal lines.

Numeral 64 denotes a photometer having a terminal group ML. The terminal group ML is connected to the terminal group CL3 of the CPU 61 via a plurality of signal lines. The photometric unit 64 has a light receiving element (not shown) so that the luminance of the subject can be measured.

A switch 25 is turned on by a first stroke of a release button (not shown), and a switch 26 is turned on by a second stroke of the release button.
The above-described camera-side CPU 61, shutter control means 62,
The aperture control unit 63, the photometry unit 64, and the like are supplied with power from a camera-side power supply (not shown).

Next, the operation of this embodiment will be described.

Next, the basic principle of the embodiment will be described.

First, referring to the flowchart of FIG. 4 (in this case, an example of a camera having a so-called manual type of exposure control in which the shutter speed and the aperture value are manually set), a power switch (not shown) is turned on. Then, the shutter speed and the aperture value are set in advance (S1).

The state of the switch 25, which is turned on by the first stroke of the release button, is detected. If it is on, the process proceeds to S3, and if it is off, the process returns to S2 (S2).

A completion state signal indicating the completion state of charging of the main capacitor 43 of the flash device is inputted from the flash device side (S
3).

If the charging completion signal has been input, the process proceeds to S5, and if not, the process returns to S3 (S4).

The state of the switch 26, which is turned on by the second stroke of the release button, is detected. If it is on, the process proceeds to S6, and if it is off, the process returns to S5 (S5).

An instruction for photometry of reflected light from the subject due to external light is issued to the photometry means 64, and the photometry result is stored. (S6).

A preliminary light emission start signal is output to the flash device (S7).

Activate a timer. In this case, the time until the timer expires is set to a time slightly longer than the photometric time of the photometric means 64 (for example, about 1 millisecond) (S
8).

In response to the expiration of the timer, the reflected light from the subject in the preliminary light emission and the reflected light from the subject due to external light are measured a plurality of times, and the average value is stored (S9).

A light emission stop signal for preliminary light emission is output to the flash device side (S10).

Based on the results of the photometry in S6 and S10, the flash emission amount of the main flash required to make the subject proper is calculated and stored (S11).

The flash light amount in the main light emission is output to the flash device side (S12).

The shutter opening operation is started (S4).

After a lapse of time from the start of the shutter opening operation to the full opening, a light emission start signal is output to the flash device side (S1).
4).

After the set shutter time has elapsed, the shutter is closed (S15), and a series of operations is terminated (S16).

Next, the operation of the flash device will be described with reference to FIG.

The operation starts with the power supply battery 41 inserted (S21).

If the state of the switch 18 is detected and the switch 18 is on, the process proceeds to S23, and if the switch 18 is off, the process returns to S22 (S2).
2).

The port P5 is set to the high level, and the booster 42
Is driven (S23).

The voltage of the main capacitor 43 is detected through the port P7, and it is detected whether the charging voltage has reached a predetermined value (for example, 260 V). If the charging voltage has reached the predetermined value, the process proceeds to S25, and if not, returns to S24. (S24). The predetermined value of the charging voltage in this case is set to the lowest voltage suitable for flash light emission.

A charge completion signal indicating that the charging voltage of the main capacitor has reached a predetermined value is output to the camera side (S
25).

A preliminary light emission start signal, which is a signal for starting preliminary light emission, is input from the camera side (S26).

The port P10 is set to the high level to enable the operation of the light intensity detection circuit 52 (S27). Port P1
Is set to the high level (S28).

The port P4 is set to a high level for about 10 microseconds. Thereby, the trigger circuit 46 operates to ionize the flash discharge tube 5 (S29). At this point,
Since the emitted light has not yet been input to the light receiving element 11, the output of the light intensity detection circuit 52 is low and the comparator 54
Is high level, the flash control circuit 50 is conductive.

In this state, the charge of the main capacitor 43 flows from the coil 47 and the discharge tube 5 through the flash control circuit 50 due to the ionization in the flash discharge tube 5, and the discharge tube 5 starts emitting light. At this time, as described above, ionization due to the operation of the trigger circuit occurs along the transparent trigger electrode 4 shown in FIG. 2, and the subsequent arc discharge follows the above-mentioned ionized portion as in arc 1 in FIG. Occurs. Since the arc is generated at the shortest distance between the anode 2 and the cathode 3, the arc does not change and the position of the arc is stabilized.

The port P2 is set to the first level (S3
0).

The peak value control using the first level as a set value will be described. The output of the light intensity detection circuit 52 gradually increases due to the light emission of the discharge tube 5,
4, when the voltage reaches the positive input voltage, that is, the first level, the output of the comparator 54 goes to a low level and is transmitted to the input SI2 of the flash control circuit 50 and
Is turned off. When the non-conducting state is established, the energy stored in the coil 47 flows through the discharge tube 5 and the diode 49, and the luminous intensity temporarily further increases, but the energy is immediately released and the luminous output decreases. When the light emission output decreases and the output of the light intensity detection circuit 52 decreases from the plus input voltage (first level voltage) of the comparator 54, the output of the comparator 54 becomes high level, and the flash control circuit 50 becomes conductive again. The discharge tube 5
When the light emission output of the flash control circuit increases, the flash control circuit 50 becomes nonconductive again. This is repeated to perform flat light emission in which the light output is maintained at a substantially constant value.

A pre-flash stop signal is input (S3
1).

The port P1 is set to low level to inhibit the input from the input terminal of the flash control circuit 50, and the flash control circuit 50 is turned off to stop the preliminary light emission (S3).
2).

The operation of the light intensity detection circuit 52 is prohibited by setting the port P10 to low level (S33).

The amount of light required for the main light emission is input from the camera (S34).

The voltage level of the port P3 is set to the second level corresponding to the main light emission amount (S35).

A main light emission start signal is input from the camera (S
36).

When the port P6 is set to the high level, the integration circuit 5
1 is started (S37).

The port P1 is set to the high level (S3
8).

The port P4 (Ti terminal) is set at a high level for about 10 microseconds to activate the trigger circuit 46 (S39).

Thus, the inside of the discharge tube 5 is ionized. At this time, since no light has been input to the light receiving element 9 yet, the output of the integrating circuit 51 is at a low level and the output of the comparator 53 is at a high level.
Is in a conductive state. In this state, the charge of the main capacitor 43 flows through the coil 47, the discharge tube 5, and the flash control circuit 50 due to the ionization of the discharge tube 5, and the discharge tube 5 starts emitting light. At this time, the light-emitting arc 1 is drawn in the bottom direction of the reflector 6 as shown in FIG. 2 by the same direction current flowing through the trigger electrode 4 as a conductor, and the arc position is stabilized.

The output of the integrating circuit 51 gradually rises due to the light emission, and when it is confirmed that the output reaches the second level set as the plus input of the comparator 53 and the light emission amount reaches the set value, the output of the comparator 53 is checked. The output is inverted to a low level, and the flash control circuit 50 is turned off to stop emitting light.

The output state of the comparator 53 is detected,
If the level is low, the process proceeds to S41, and if the level is high, the process returns to S40 (S40).

When the port P6 is set to low level, the integration circuit 5
1 is prohibited (S41). The port P1 is set to low level (S42), and a series of operations of the flash device is terminated (S43).

As described above, according to the present embodiment, the position of the light emitting arc 1 can be stabilized.

(Other Embodiments) In the above embodiment, a camera having manual exposure control for manually setting a shutter speed and an aperture value and performing preliminary light emission and main light emission using flat light emission is described as an example. Although described above, the present invention is not limited to this, and can be applied not only to the manual setting but also to the fully automatic mode. In addition, the present invention effectively functions even when applied to a case where light emission control corresponding to each zoom position is performed based on a representative zoom position by using a lens exchange system in combination.

The present invention is also effective when applied to a camera of the type capable of magnetically recording information called APS.

The present invention is also effective when applied to the case of switching between flash light emission and flat light emission by a synchro operation according to the shutter speed of the camera and corresponding light emission control.

The present invention also functions effectively when applied to a case in which light emission control is performed in which the set value of the light emission intensity is changed in accordance with the charging voltage of the main capacitor in flat light emission or flash light emission.

In the above embodiment, a ring-shaped discharge tube is used as an example of an arc-shaped discharge tube, but a semi-circular discharge tube may be used.

[0080]

According to the first to third aspects of the present invention, it is easy to stabilize the arc position at the initial stage of light emission and to stabilize the direction of light irradiation. The cause of the unstable light emission output can be eliminated.

According to the fourth, sixth and seventh aspects of the present invention, even when the arc discharge tube is used, the light emission arc position can be stabilized by a simple control structure when the light emission intensity is controlled by flat light emission.

According to the fifth, sixth and seventh aspects of the present invention, even when a circular arc discharge tube is used, the position of the light emitting arc can be stabilized by a simple control structure when controlling the light emission amount.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a flash photographing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a dotted line shown in FIG.

FIG. 3 is a block diagram in which the apparatus shown in FIG. 1 is applied to a single-lens reflex camera.

FIG. 4 is a flowchart of the operation of the camera unit shown in FIG. 3;

FIG. 5 is a flowchart of the operation of the flash device shown in FIG. 3;

FIG. 6 is a configuration diagram of a conventional flash device.

FIG. 7 is a configuration diagram of a flash device to which a conventional technique is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light emission arc 2 ... Anode 3 ... Cathode 4 ... Trigger electrode 5 ... Discharge tube 6 ... Reflector shade 7 ... Panel 8, 10 ... Light guide surface 9, 11 ... Light receiving element 12 ... Projection

[Procedure amendment]

[Submission date] January 24, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art In a conventional flash device, an initial period of light emission, for example, several tens of microseconds from the start of flash light emission , is taken.
That is, when the amount of emitted light is small, or the light output of the light output
When the intensity is low, the position of the arc inside the flash discharge tube is generally not stable, so that the direction of light irradiation is not stable, causing irradiation unevenness on the film. Also, in a method of detecting emitted light by a light receiving sensor provided near a light emitting unit and controlling the emitted light based on the detection result,
Even if the detection and control system operates normally, the detection result emits light because the arc position in the discharge tube glass tube is not stable
There is an inconvenience that the light emission output is unstable when viewed from the subject.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

The reason will be described with reference to the drawings. FIG.
(A) shows the relationship between the arc discharge tube and the reflector. Although not shown in FIG. 7A, a panel 207 shown in FIG. 7B is provided on the front surface of the discharge tube 201. FIG.
FIG. 7B shows a cross section of the portion indicated by the arrow in FIG. When a trigger is applied to the discharge tube 201, a trigger discharge is generated along the trigger electrode 204, and an initial discharge arc is also generated along the trigger electrode at a portion 205 shown in FIG. However, since the generated arc has a property of trying to pass the shortest distance between the anode 202 and the cathode 203 in the glass tube, it immediately moves from the portion 205 showing the arc in FIG. Is not stable.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

An object of a second invention according to the present application is that the light emission output intensity value is substantially constant even when an arc-shaped discharge tube is used .
Light emission to obtain a so-called flat light emission
When performing output intensity control, the stabilization of the emission arc position
It is an object of the present invention to provide a flash photographing apparatus which can be easily achieved and can eliminate unstable light output intensity detection .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

An object of a third invention according to the present application is to stabilize the position of a light-emitting arc and to make the detection of the light-emitting amount unstable when controlling the light-emitting amount even when using an arc-shaped discharge tube.
An object of the present invention is to provide a flash photographing device that can be eliminated .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

As described above, the trigger electrode 4 is arranged so as to include the shortest line between the anode terminal A and the cathode terminal B of the discharge tube 5 and has a width shorter than a half circumference of the discharge tube 5. When the light emission operation of the discharge tube 5 starts, ionization due to the operation of the trigger circuit occurs along the transparent trigger electrode 4 shown in FIG. 2, and the subsequent arc discharge follows the above-mentioned ionization portion as in arc 1 in FIG. Occurs. Since the arc is generated at the shortest distance between the anode 2 and the cathode 3, the arc does not fluctuate and the position of the arc is stabilized.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

As shown in FIG. 2 , the light receiving elements 9, 11 are arranged near the reflector 6 of the flash discharge tube 5, and
Is received directly through the panel 7 . Microcomputer FPU on the flash device side
57 has ten ports and a terminal group FL1 and a terminal group F
L1 is a microcomputer CPU of a camera unit described later.
It is connected to 61 terminal groups CL1 via a plurality of signal lines. 18 is a start operation switch of the flash device.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

A preset shutter time, aperture value
Based on the photometry result in S6 and the photometry result in S10, the flash emission amount of the main emission necessary for making the subject proper is calculated and stored (S11).

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Change

[Correction contents]

[0045] The outgoing light intensity in the main light emission output to the flash device side (S12).

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

The shutter opening operation is started by the shutter control means 62 (S 13 ).

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction contents]

A preliminary light emission stop signal is input from the camera (S31).

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0070

[Correction method] Change

[Correction contents]

Thus, the inside of the discharge tube 5 is ionized. At this time, since no light has been input to the light receiving element 9 yet, the output of the integrating circuit 51 is at a low level and the output of the comparator 53 is at a high level.
Is in a conductive state. In this state, the charge of the main capacitor 43 flows through the coil 47, the discharge tube 5, and the flash control circuit 50 due to the ionization of the discharge tube 5, and the discharge tube 5 starts emitting light. At this time, as described above, the operation of the trigger circuit is performed.
Ionization along the transparent trigger electrode 4 shown in FIG.
Occurs and the subsequent arc discharge follows the ionization
It occurs like arc 1 in FIG. The arc is shaded with anode 2
It does not fluctuate because it occurs at the shortest distance of pole 3.
Position is stabilized.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0077

[Correction method] Change

[Correction contents]

Also, according to the shutter speed of the camera,
Blende light emitting, it is also effective when applied to the case of the corresponding emission control by switching the flat emission.

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 14]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

Claims (7)

[Claims] 1. A flash device comprising: an arc-shaped discharge tube provided at both ends with discharge electrodes to which accumulated charge of a capacitor is applied; and a trigger electrode provided on the discharge tube. A flash device provided on the inner diameter side of a discharge tube, at a position including at least a line connecting a shortest distance between the two discharge electrodes. 2. A flash device according to claim 1, wherein said trigger electrode has a width shorter than a half circumference of said discharge tube. 3. The flash device according to claim 1, wherein the discharge tube has a semicircular or annular shape. 4. An arc-shaped discharge tube provided with discharge electrodes to both ends of which a charge stored in a capacitor is applied, and said trigger electrode being located on the inner diameter side of said discharge tube and having a shortest distance between said two discharge electrodes. A trigger electrode provided at a position including at least a line connecting the first and second light-receiving elements, a first light-receiving element for receiving light emitted from the discharge tube, and a light intensity of the emitted light based on information received by the first light-receiving element. And a control means for controlling the temperature to be substantially constant. 5. An arc-shaped discharge tube provided with discharge electrodes to both ends of which a charge stored in a capacitor is applied, and said trigger electrode being located on the inner diameter side of said discharge tube and having a shortest distance between said two discharge electrodes. A trigger electrode provided at a position including at least a line connected by the above, a second light receiving element for receiving light emitted from the discharge tube, and controlling the amount of emitted light based on information received by the second light receiving element. A flash photographing device comprising a control unit. 6. A flash photographing apparatus according to claim 4, wherein said trigger electrode has a width shorter than a half circumference of said discharge tube. 7. A flash photographing apparatus according to claim 4, wherein said discharge tube has a semicircular or annular shape.