KR100228218B1 - High brightness light source forming device and method thereof - Google Patents

Abstract

The present invention relates to a high-brightness light source forming apparatus and a method for forming the light source for acquiring the appropriate luminance required when recording various physical phenomena generated in a process such as welding and processing by using a high speed photographing apparatus. Inverter 20 for generating square wave alternating current by the primary rectifying bridge 10 for smoothing and the DC voltage converted by the primary rectifying bridge 10 according to the control conditions of the inverter control circuit 90 of the PWM control method. ), A transformer 30 for converting to a secondary AC voltage, a secondary rectifying bridge 40 and a reactor 50 for rectifying and smoothing again, and a xenon connected to the reactor 50 to generate an arc Since it is composed of a lamp 70, various physical phenomena generated in welding and processing and other processes, such as melting, heat generation, instantaneous deformation, movement, etc. This high-intensity light source for obtaining a suitable brightness required when you want to be obtained.

Description

High brightness light source forming apparatus and method for forming the light source

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high brightness light source forming apparatus and a light source forming method thereof, and particularly, to a high brightness light source for obtaining proper luminance required when recording various physical phenomena generated in a process such as welding and processing by using a high speed photographing apparatus. A forming apparatus and a light source forming method thereof.

In general, when recording various physical phenomena using a high speed recording device such as a high speed camera or an image processor, the light source device should be able to obtain very high brightness white light in order to improve the color reproduction and recording degree of the development recording. Minimal flicker should be avoided and stable light should be obtained without any change in illuminance.

As a method of obtaining such a high brightness light, a color temperature of 3,200K or 5,500K, which is a white light series, should be obtained in relation to the color balance of a film used for photographing a mercury lamp, a sodium lamp, a halogen lamp, and the like.

However, mercury lamps and sodium lamps are not easily reproduced when they are used for photographing beyond the color temperature range, and thus, a special optical filter may be used. However, the use of filters is almost avoided because of practical problems.

Since the optical spectrum of the mercury lamp is light mainly composed of a color wavelength of 6,000K or more and a short wavelength of 500 nm or less, the blue system is particularly emphasized when the light source is used, so that the original color cannot be represented.

On the other hand, the output wavelength of sodium lamp is almost monochromatic light of 590 nm, showing only yellow-based light, so that it is impossible to reproduce a wide color of 470 nm to 700 nm.

Compared to these light sources, arc lamps and xenon arc lamps have a short wavelength region, but because they generate very wide wavelengths, they have a wide range of use as natural light.

The normal arc light source uses a thyristor-controlled power supply to turn on the light source, so there is no problem when the speed is relatively slow. However, when shooting at a high speed of 1,000 f / s or higher, light flickering occurs and the recording phenomenon is observed. The picture is reproduced on the screen as it is, greatly reducing the quality of the recording.

In high-speed shooting or high-speed observation recording, lighting requires a light source of 1,000W or more and 1,000W. Normally, when shooting with a camera, the shutter speed is assumed to be 1/125 sec. Since more than 125,000 records are required, a very high brightness light source is required, and the power supply is varied from 0 to 100% without any ripple (ripple or harmonic content superimposed on the AC fundamental wave). shall.

Until now, since the power source ripple cannot be completely removed, when used for lighting during high-speed shooting, overexposure is performed in the section containing ripple. Since the synchronization with the shooting speed due to the fluctuation is not constant, the change of exposure due to continuous light emission cannot be excluded, and the resolution of the high-speed shooting recording is greatly reduced, and in some cases, the shape reproduction is impossible.

To obtain a few thousand watts of light, it is required to have a capacity of 50 ~ 100A, assuming a 24V bulb, similarly need a power capacity of 40 ~ 200A, power must be changed without ripple up to 0 ~ maximum There is a problem, and in order to change the illuminance change to "0", changing the light source (power supply) to "0" has been applied so far. It is virtually impossible to set the variation of the light source (power source) to "0" and there is a problem that continuous light emission is more difficult at 1,000 W or more.

The present invention has been invented to solve various problems caused in the conventional light source device in view of the above situation, and a light source for changing the illuminance to "0" by using an inverter controlled power supply device employing a high speed power device of power control. Avoiding the conventional technique of setting the ripple to "0", and artificially providing at least twice as much ripple to the number of recordings per second without making the ripple of the light source to "0", at least two or more equally sized lights every minute of the number of recordings. By providing output pulse, it is possible to minimize the change of illuminance irradiated on the film surface of high-speed developing record.It provides very stable light so that there is no flicker or change of illuminance even at high speed shooting over 1,000f / s. Can be used as a light source to generate white light with very high brightness, allowing a wide color temperature range to reproduce colors To provide a high luminance light source forming the light source apparatus and a forming method capable of it is an object.

1 is a block diagram showing a high brightness light source forming apparatus of the present invention.

2 is an output waveform diagram of a conventional thyristor-controlled power supply.

3 is an output waveform diagram of an inverter controlled power supply according to the present invention.

4 is an output cycle distribution diagram of a conventional thyristor-controlled power supply.

5 is an output cycle distribution diagram of the inverter-controlled power supply according to the present invention.

6 (a) and (b) are photographs taken of light formed by a conventional light source forming apparatus.

7 is a photograph of the light formed by the light source forming apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

1: primary rectification bridge 2: inverter

3: transformer 4: secondary rectification bridge

5: reactor 6: ignition

7: xenon lamp 8: magnetic lens

9: Inverter Control Circuit 100: Feedback Control Sensor

The high brightness light source forming apparatus of the present invention for achieving the above object inputs a DC voltage converted by the primary rectifying bridge 1 through a capacitor to a primary rectifying bridge 1 rectifying and smoothing an AC input voltage and PWM. Inverter 2 for generating square wave alternating current under the control of the controller according to the control condition of the inverter control circuit 9 of the control method and converting the primary AC voltage input to the inverter 2 into the secondary AC voltage To the transformer 3 and to the inverter control circuit 9 through a controller, and to the inverter 2 through a secondary rectifying bridge 4 to rectify the output of the inverter 2. A reactor 5 for smoothing the output of the rectifying bridge 4 is connected, and an xenon lamp 7 for generating an arc is connected to the reactor 5, and an initial arc generation of the xenon lamp 7 can be easily performed. Of high voltage circuit The ignition device 6 is connected, and a magnet lens 8 for inducing cathode electron emission is connected to one side of the xenon lamp 7, and on the other side according to the current flowing in the xenon lamp 7 during arc stabilization. By connecting a feedback control sensor 100 which is a feedback signal source for sustaining arc stability by obtaining a constant output, and connecting the secondary rectifying bridge 4 and the feedback control sensor 100 to the inverter control circuit 9 Characterized in that configured.

In addition, the high brightness light source forming method of the present invention for achieving the above object is a method for forming a light source used when recording various physical phenomena generated in other processes such as welding, processing, etc. using a high-speed imaging device, AC input power Rectifying and smoothing by the primary rectifying bridge 1; A process of converting the converted DC voltage into a secondary AC voltage by feeding the transformer 3 by generating square wave AC by the inverter 2 under the control of the controller according to the control condition of the inverter control circuit 90 of the PWM control method. and; Rectifying and smoothing the converted AC voltage to a secondary rectifying bridge (4) and a reactor (5); The rectified and smooth voltage is supplied to the xenon lamp 7 to generate an arc.

In the method of forming the high brightness light source of the present invention, the secondary AC voltage converted by the transformer 3 has a control frequency capable of adding at least two or more optical pulses to one screen of the maximum photographing proxy, and the xenon lamp 7 The initial arc generation of) uses the high voltage of the ignition device (6). In addition, the arc generated by the xenon lamp 7 is a signal detected by the feedback control sensor 100 to stabilize the current to maintain the stability of the arc, and the xenon lamp 7 is connected to the magnet lens 8. It is preferable that the emission of the cathode electrons is induced.

The high brightness light source forming apparatus and the light source forming method of the present invention configured as described above are rectified and smoothed at an input AC voltage to be 10,000 f / s, which is a high region among the speeds of the high-speed development recording applied to date by the inverter control circuit 9. Is converted to control and square wave alternating current at a sufficiently high frequency so as to give at least two light output pulses per element field, and then the transformer 3 is fed to the secondary to rectify the converted output. By supplying a smooth and very stable output power to the xenon lamp 7 to generate an arc, stable light of very high brightness can be obtained without flickering.

The present invention provides a high brightness light source forming apparatus required for proper shooting conditions when recording various physical phenomena with a high speed photographing apparatus, etc., and can obtain a color temperature of 3,200K or 5,500K, which is a very high brightness white light series, Even in this case, there is an effect of obtaining a very stable illuminance without a phenomenon such as flickering.

EXAMPLE

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a high brightness light source forming apparatus of the present invention, FIG. 2 is an output waveform diagram of a conventional die Lister controlled power supply, and FIG. 3 is an output waveform diagram of an inverter controlled power supply according to the present invention. Output Cycle Distribution Diagram of Controlled Power Supply, FIG. 5 is an output cycle distribution diagram of the Inverter Controlled Power Supply according to the present invention.

As shown in FIG. 1, the present invention uses the primary control rectification bridge (1) for rectifying and smoothing the AC input voltage and the direct current voltage converted by the primary rectification bridge (1). Inverter 2 for generating square wave alternating current, transformer 3 for converting into secondary AC voltage, and secondary rectifying bridge 4 for rectifying smoothing under control of the controller according to (9). And a xenon lamp 7 connected to the reactor 5 and generating an arc.

The reactor 5 includes an ignition device 6 having a high voltage circuit configuration for facilitating the initial arc generation of the xenon lamp 7, and on one side of the xenon lamp 7 for inducing cathode electron emission. The magnet lens 8 is connected and connected, and the other side of the xenon lamp 7 is a Hall sensor element which is a feedback signal source for sustaining arc stability by obtaining a constant output according to the current flowing in the xenon lamp 7 during arc stabilization. The feedback control sensor 100 is configured to be additionally installed.

The operation of the high brightness light source forming apparatus of the present invention configured as described above will be described.

AC power is rectified and smoothed by the primary rectifying bridge 1, and the inverter control circuit 9 feeds the transformer 3 by PWM control in order to generate a square wave alternating current of 20 kV or more in the inverter 2. It converts the power supply into the square wave AC region of very high frequency.

An arc is generated by supplying the converted voltage by the transformer 3 to the xenon lamp 7 by rectifying and smoothing it as the secondary rectifying bridge 4 and the reactor 5.

The ignition device 6 is a device for facilitating initial arc generation, and generates a predetermined high voltage. The magnet lens 8 induces electron emission from the cathode of the xenon lamp 7, and the feedback The control sensor 100 obtains a constant signal according to the current flowing in the xenon lamp 7 during arc discharge to maintain the stability of the arc.

In order to achieve arc stability, that is, stable light, the output of the power supply must be changed from 0 to maximum. However, the power supply device in the conventional thyristor control method is very difficult to make a DC power supply with a ripple of "0".

When using a power source containing ripple, the brightness of the illumination light changes, so the brightness of the recorded image of the high-speed observation record is not constant. Therefore, the image is difficult to analyze. The amount of light energy, that is, the amount of energy (pulse) of light irradiated per frame is controlled to be constant. If there are two or more constant pulses per frame, the brightness of the image is almost unchanged. If the light pulse output is 4 or more, the brightness of the image is constant without any problem.

The photographing light source should be able to obtain a color temperature of 3,200K or 5,500K, which is a standard white light series, in relation to the color temperature balance of the film used for photographing.

However, mercury lamps and sodium lamps are greatly out of this color temperature range, so color reproduction is impossible when used for photography. Compared with these light sources, xenon arc lamps have a very wide wavelength, and thus have a wide range of use as light similar to natural light.

Therefore, a xenon arc lamp was used as a light source in the present invention. In addition, the flickering phenomenon of the conventional thyristor-controlled power supply is caused by the frequency influence of the AC input power supply, and as shown in FIG. 4, the magnitude of the light output pulse irradiated onto the film surface is not constant for each recording number. .

In order to prevent this, by using an inverter-controlled power supply, as shown in FIG. 5, the number of light output pulses irradiated onto the film surface is constant for each recording number, and at least two light output pulses are displayed on one screen. By controlling the switching frequency so as to obtain a very stable output, it is possible to obtain a high brightness light that can satisfactorily satisfy the quality of the high-speed developing recording without changing the illuminance.

FIG. 6 is a photograph photographing light formed by a conventional light source apparatus, and FIG. 7 is photograph photographing light formed by the light source forming apparatus of the present invention. In FIG. 6 (a), the dark part is photographed at the moment due to unstable low brightness, and (b) is the picture taken when there is an appropriate number of pulses per frame.

As described above, in the conventional light source device, the brightness required for photographing is not guaranteed, and the dark part and the normal part are photographed alternately, and according to the device of the present invention, even brightness is formed in any part as shown in FIG. Therefore, there is an effect that enables the analysis of various normal physical phenomena.

Therefore, the high brightness light source forming apparatus and the method of forming the light source of the present invention use various high-speed imaging apparatuses for various physical phenomena, such as melting phenomenon, exothermic phenomenon, instantaneous deformation, moving phenomenon, etc., generated in welding and processing processes. A high brightness light source is obtained to obtain the proper brightness required when recording.

As described above, according to the present invention, when recording various physical phenomena and the like with a high speed photographing device, a color temperature of 3,200K or 5,500K, which is a very high brightness white light series necessary for proper shooting conditions, can be obtained. Even in this case, there is an effect of obtaining a very stable illuminance without a phenomenon such as flickering.

Claims (4)

In accordance with the control conditions of the inverter control circuit 9 of the PWM control method by inputting the DC voltage converted by the primary rectifying bridge 1 through the capacitor to the primary rectifying bridge 1 rectifying and smoothing the AC input voltage. Connect the inverter 2 for generating square wave alternating current by the control of the controller, and connect the transformer 3 for converting the primary AC voltage input to the inverter 2 into the secondary AC voltage and through the controller. A reactor (5) connecting the inverter control circuit (9) and smoothing the output of the secondary rectifying bridge (4) through the secondary rectifying bridge (4) rectifying the output of the inverter (2) to the inverter (2). And an xenon lamp (7) generating an arc to the reactor (5) and an ignition device (6) of a high voltage circuit configuration for facilitating initial arc generation of the xenon lamp (7). And a cathode electron at one side of the xenon lamp 7 The feedback control sensor 100 which is a feedback signal source for maintaining the arc stability by connecting a magnet lens 8 for inducing the discharge and obtaining a constant output according to the current flowing in the xenon lamp 7 during arc stabilization on the other side And a secondary rectifying bridge (4) and a feedback control sensor (100) connected to the inverter control circuit (9). In the method of forming a light source used when recording various physical phenomena generated in other processes such as welding, processing, etc. by using a high speed photographing apparatus, the AC input power is rectified and smoothed by the primary rectifying bridge 1. Process of doing; A process of converting the converted DC voltage into a secondary AC voltage by feeding the transformer 3 by generating square wave AC by the inverter 2 under the control of the controller according to the control condition of the inverter control circuit 90 of the PWM control method. and; Rectifying and smoothing the converted AC voltage to a secondary rectifying bridge 4 and a reactor 5; And supplying the rectified and smooth voltages to the xenon lamp (7) to generate an arc. The method of claim 2, wherein the secondary AC voltage converted by the transformer 3 has a control frequency capable of adding at least two or more optical pulses to one screen of the maximum photographing proxy. . The arc generated by the xenon lamp (7) is a signal detected by the feedback control sensor 100 to stabilize the current to maintain the stability of the arc, the xenon lamp (7) is a magnet lens A method of forming a high brightness light source, characterized in that the cathode electron emission is induced by (8).