KR101178430B1 - Strobe lighting unit for camera - Google Patents

Abstract

PURPOSE: A strobe for a camera provides various photographing environment because lights being emitted having no infrared rays and ultraviolet rays is harmless and a synchronous speed range of the photography of a camera is large. CONSTITUTION: A strobe for a camera comprises an LED module(10), a diffusion plate(20), a radiator(30), and a controller(100). The diffusion plate is arranged in a front side of the LED module. The radiator emits radiating heat of the LED module. The controller attunes to the photography of a camera, thereby controlling lighting of the LED module. The controller comprises a power module, an amplifying unit, a switching unit, and a controlling unit.

Description

[0001] Strobe lighting unit for camera [0002]

The present invention relates to a strobe device for a camera, and more particularly, using a LED module and a controller for the same, low power high efficiency, even light distribution, various variability of the light irradiation surface, various tuning speed control, fast charging, harmless to the human body, A strobe device for a camera having various color temperatures, excellent durability, and low heat generation.

In general, a strobe device refers to a device that illuminates a subject or its surroundings when photographing a camera.

Photography is the art of light, and the use of a strobe device is considered necessary to obtain a good picture in a situation where there is a lack of natural light.

Advantages of using the strobe device are that it is possible to obtain a proper exposure even in a low light amount, and to secure a shutter speed for a camera free image in a low light situation.

In the past, xenon lap was mainly used as a light source for strobe devices.

A xenon lamp is a lamp-type light source that is turned on by using a discharge of xenon gas enclosed in a quartz tube (or glass tube). The spectral distribution of the xenon lamp is a strong line in the continuous spectrum and near infrared rays from the ultraviolet region to the visible ray region. It has a spectrum, and the color temperature is almost constant and the brightness is very high during identification with natural daylight. In addition, the light output is stable at the same time as the lighting, and has the feature that instantaneous lighting after the light is turned off.

The xenon lamp, which is a lamp-type light source, has various drawbacks as follows.

First of all, although a large amount of light is easily obtained, it is widely used as a light source of a strobe device, but the light efficiency at the time of a large amount of light (600 W class) is not as good as about 30 lm / W at most.

In addition, due to the inherent limitations of the point light source, which is a lamp type, various diffusers (diffusion plate; soft box, reflector, etc.) are used to make the shape of light, but it is difficult to distribute the light by selecting and uniformly illuminating the area to be illuminated. .

In addition, the tuning speed for camera shooting is about 1/25 to 1/250, and the tuning speed adjustable range is limited.

In addition, a large amount of current is supplied by discharging the charging power for an instantaneous large amount of light. Since the power consumption is large, it takes a long time to charge the large amount of light to discharge the large amount of light.

In addition, there is a problem that adversely affects the cornea and skin because it contains ultraviolet rays and infrared rays harmful to the human body.

Also, it is impossible to adjust the color temperature of light.

In addition, they are rated as consumables that often require thousands of hours of life and must be replaced frequently.

The present invention has been made in order to solve the problem caused by the conventional strobe device using a lamp-type light source, using an LED module as a light source, low power consumption, high efficiency, has a semi-permanent life It has light of various color temperature, can select illumination area and illuminate constantly, and can adjust the tuning speed in a wide range from a few seconds to a few thousandth of a second to provide various shooting scenes, and it consumes fast It is an object of the present invention to provide a strobe device for a camera having a charging speed and a rapid light emission interval.

In addition, the heat sink is introduced to prevent the LED module from being damaged by heat, and the temperature sensor is provided so that the instantaneous large current is supplied to the LED module to cut off the power before the temperature rises above the critical limit. It is another object of the present invention to provide a strobe device for camel that prevents the LED module from being damaged while outputting several times to several times higher power.

Camera strobe device according to the present invention for achieving the above object is

LED module;

A diffusion plate disposed on the front surface of the LED module;

A radiator for dissipating heat dissipation of the LED module;

And a controller for controlling lighting of the LED module by synchronizing with photographing of a camera.

And the controller

A power module for supplying power to the LED module;

An amplifier for charging and discharging the power of the power module to amplify the power supplied to the LED module;

A switching unit which is provided between the amplifying unit and the LED module to control power supply to the LED module by switching;

And a controller configured to receive a synchronization signal for camera photographing and control switching of the amplifier, the discharge, and the switching unit.

Further comprising: a temperature sensor for detecting the radiant heat of the LED module to transmit to the controller,

The control unit cuts off the power supply to the LED when the detected temperature of the temperature sensor exceeds a reference temperature,

The controller

Light amount volume for adjusting the light amount of the LED module,

Characterized in that it further comprises a notification unit for informing the user of the state of charge of the amplifier and the temperature of the temperature sensor.

The camera strobe device according to the present invention having such a configuration has high efficiency while using a LED module as a light source, high efficiency, and a fast charging speed for supplying a large current at the time of camera shooting. It is possible to irradiate various color lights, has a semi-permanent life, and is economical, and it is harmless to the human body because there is no ultraviolet ray or infrared ray in the divergent light, and the range of synchronization speed for the camera shooting is large, so it can provide various shooting environments. You can choose the lighting area according to the shooting situation and distribute the light constantly and efficiently.

In addition, LED module generates less heat than lamp, and heat generated from LED module is quickly released through heat sink, and when heat is accumulated in LED module, it becomes high temperature due to the detection of temperature sensor and damage to product and fire. Prevent danger

1 is a perspective view of a strobe device according to an example of the present invention;
FIG. 2 is an exploded perspective view of the strobe device shown in FIG. 1. FIG.
Figure 3 is a perspective view showing a coupling structure of the heat sink and the LED module and the diffusion plate.
4 is a block diagram of a controller according to the present invention.

Hereinafter, with reference to the drawings will be described in more detail with respect to the camera strobe device according to the present invention.

As shown in the drawing, the camera strobe device according to the present invention includes a large component called an LED module 10, a diffusion plate 20, a heat sink 30, and a controller 100.

The LED module 10 includes a PCB 13 and a plurality of LEDs 11 mounted on the PCB 13.

The LED 11 is preferably a high brightness chip LED 11, it is preferable to use a color LED 11 that can emit light of various colors. The color LED is a combination of R (red), G (green), and B (blue) devices that emit three primary colors of light. The three LEDs can combine various primary colors of light to emit various colors including white.

When shooting, white light is used the most, so in order to reduce manufacturing cost, the LED emitting one of R, G, and B colors is covered with a specific color phosphor lens, and the light emitted from the LED passes through the lens. It may be desirable to be illuminated in white color. Such LEDs with phosphor lenses are commonly referred to as high color rendering white LEDs.

When using high color rendering white LEDs, some of the LEDs of the entire LED module use high color rendering white LEDs, some use color LEDs, and high color rendering white LEDs and color LEDs are appropriately arranged to reduce costs while providing various colors of lighting. It is desirable to make this possible.

Although the PCB 13 is shown as a planar shape in the drawing, a polygonal shape may be used depending on a photographing purpose, an environment, and the like. Also, the LEDs 11 may have a space or arrangement Can be varied.

The diffusion plate 20 is disposed on the front surface of the LED module 10 to protect the LED module 10 and at the same time diffuse the light emitted from the LED module 10.

The heat sink 30 is in contact with the rear surface of the LED module 10 to quickly dissipate the heat of dissipation of the LED module 10 to the outside. The radiator 30 is preferably made of a light aluminum material having excellent thermal conductivity.

And in order to increase the heat radiation efficiency, the radiator 30 may be preferably provided with cooling means (not shown) capable of forcibly cooling the conducted heat.

As the cooling means, a circulation pipe and a circulation pump for circulating the refrigerant, a cooling fan and a motor, a cooling element that is a semiconductor element, and the like may be used.

The LED module 10 and the diffusion plate 20 are detachably coupled to the heat sink 30, respectively, and the LED module 10 has a heat sink 30 so that the heat of dissipation can be more effectively transmitted to the heat sink. ) It is in close contact with the front.

Referring to FIG. 3, a step 31 is formed at the front edge of the heat sink 30 to assemble and engage the inner end of the diffusion plate 2, and the step 31 is connected to the side. A connecting groove 32 is formed, and a hook hole 33 is formed at an end of the connecting groove, and a connecting portion 22 seated in the connecting groove 32 protrudes from the rear surface of the diffusion plate 20. Is formed, the hook portion 23 is hooked into the hook hole 33 is hooked to the end of the connecting portion 22 is formed to protrude outward.

When the diffuser plate 20 is pushed so that the rear end portion of the diffusion plate 20 fits into the step 31 of the heat sink 30, the connection part 22 is advanced along the connection groove 32, so that the hook protrusion 23 is moved. By being inserted into and hooked into the hook hole 33, the diffusion plate 20 is coupled so as not to be separated from the heat sink, and the hook protrusion 23 is pressed out of the hook hole 33 by pressing the connection part 22 with a finger. Pulling the diffuser plate 20 in a state in which the hook coupling is released, the diffusion plate 20 is easily separated and separated from the heat sink 30.

Referring to FIG. 3, an accommodating groove 36 is formed on the front surface of the heat sink 30 to receive and seat the LED module 10, and a straight insertion hole is formed at the bottom of the accommodating groove 36. 37 is formed everywhere, and the insertion hole 17 is formed in various places in the PCB 13 of the LED module 10 corresponding to the insertion hole 37.

In addition, the insertion hole 37 and the insertion hole 17 has elasticity and has a mid-light front and rear narrow structure, and at the rear end, an advance portion 51 for guiding the insertion advance is formed, and elasticity that closely adheres to the elastic force from the middle portion to the front end. Part 53 is formed, the front end of the elastic close contact member 50 is coupled to the engaging portion 55 is formed, the PCB 13 of the LED module 10 to the front surface of the heat sink (30). Close contact

The LED module 10 is arranged in the receiving groove 36 of the heat sink to be aligned with the insertion hole 17 of the PCB 13 and the insertion hole 37 of the heat sink 30, in this state When the forward part 51 of the elastic contact member 50 is pushed into the insertion hole 17 of the PCB 13, the forward part 51 and the elastic part 53 are contracted so that the width is narrowed and the insertion hole is narrowed. An insertion hole 37 of the radiator 30 is inserted into the insertion hole 37 and a boundary (that is, the widest part) between the forward part 51 and the elastic part 53. When it reaches the forward portion 51 and the elastic portion 53 is restored to the elastic force, even if there is no pushing force is automatically inserted into the inner surface of the insertion hole 37, when the engaging portion 55 is caught on the surface of the PCB (13) The insertion force of the elastic contact member 50 is stopped, but the elastic force to be restored of the elastic portion 53 is continued to pull the PCB 13 toward the heat sink 30 to thereby open the rear surface of the PCB 13. It is in close contact with the front of the radiator (30).

When the LED module 10 is separated and detached from the heat sink 30, the elastic contact member 50 is inserted into the insertion hole 37 and the insertion hole by grasping and pulling the locking part 55 of the elastic contact member 50. After the separation from the LED module 10 is lifted off the receiving groove 36 is easily separated and separated.

By bonding the LED module 10 to the heat sink 30 using an adhesive, the LED module 10 and the heat sink 30 can be easily brought into close contact with each other, but according to the shooting environment, It is necessary to change the arrangement position and spacing, etc. in the PCB (13), that is, it is necessary to replace the LED module 10, by replacing the LED module 10 to the heat sink 30 as described above only replace the LED module. And it is desirable to use the heat sink as it is to increase the economics.

The controller 100 is a device for controlling the driving of the LED module 10, the main board 40 attached to the rear of the heat sink 30, various electronic devices mounted on the main board, and the main It is mounted on the board 40 and includes a control button (41, 43) for the user's operation, and a display unit 45 for displaying the output light amount of the LED module 10.

The operation button includes a power button 41 for turning on / off the power and a volume switch 43 for adjusting the amount of light emitted by the LED module 10.

The display unit 45 includes an LED and a cover covering the LEDs, the power button 41 is turned on to be notified when the power is supplied, and the LED module 10 according to the operation position of the volume switch 43. The level of the amount of light to be output is indicated by changing the color. For example, the display unit 45 is turned on in a deep red color as the output light quantity level of the LED module 10 increases so that the user can check the intensity of the output light quantity in the color of the display unit 45.

As shown in FIG. 4, the controller 100 includes a power module 110, an amplifier 120, a switching unit 130, a temperature sensor 150, a feedback unit 160, and a buzzer 147 as a notification unit. And a display unit 145, a light volume 143, and a controller 170.

The power module 110 supplies power for turning on the LED module 10 and driving power for driving the controller 170.

The power module 110 constant-voltage or constant-current power supplied from a battery or commercial power.

The amplifier 120 is charged with the power supplied by the power module 110, and is discharged by being tuned at the time of camera shooting under the control of the controller 170.

The power discharged from the amplifying unit 120 is combined with the power output from the power module 110 to be amplified so that a large current is instantaneously supplied to the LED module 10 at the time of photographing so as to light up with a large amount of light.

The switching unit 130 is switched on and off under the control of the control unit 170, so that the output power of the amplifier 120 is supplied to the LED module 10 at the moment of photographing. Transistors (BJT, FET, IGBT), thyristors, triacs, etc. may be used as the switching elements of the switching unit 130.

The temperature sensor 150 detects the radiant heat of the LED module 10 and transmits it to the controller 170.

When the temperature sensed by the temperature sensor 150 exceeds the reference temperature, the controller 170 cuts off the power supply of the power module 110 so that the temperature of the LED module 10 is no longer increased. Protect.

The feedback unit 160 senses a current supplied to the LED module 10 and feeds it back to the control unit 170.

The controller 170 controls the switching of the power module 110 according to the strength of the current sensed by the feedback unit 160 so that the power module 110 outputs a constant current (or constant voltage).

The notification unit includes a buzzer 147 and a display unit 145 for informing the operation state of the strobe device by sound and time, respectively.

The notification unit notifies the user when the charging of the amplifying unit 120 is completed, so that photographing is possible, that is, it indicates that large light quantity illumination is possible.

The light volume 143 has a variable resistance value according to an operation of the volume switch 43 and transmits the variable resistance value to the controller 170.

The controller 170 adjusts the amount of light emitted by the LED module 10 according to the resistance value of the light volume 147. That is, the intensity of the power output from the power module 110 is adjusted.

The controller 170 controls the controller 100 as a whole, and the control method is as follows.

When the power button 141 is turned on, the power module 110 causes the power to be output so that the LED module 10 is turned on with a low light quantity and the amplification unit 120 is charged.

At this time, the entire LED 11 of the LED module 10 may be turned on with low light quantity, and only some of the LEDs 11 may be turned on with low light quantity.

After the LED module 10 is turned on, by receiving the feedback of the strength of the current (or voltage) supplied to the LED module 10 from the feedback unit 160 to control the switching of the power module 110, the LED Constant current (or constant voltage) is continuously supplied to the module 10.

When the resistance value of the light volume 143 is variable, the output power of the power module 110 is adjusted by adjusting the pulse width (that is, duty ratio) or amplitude of the output power of the power module 110 according to the variable resistance value. The intensity of the LED module 10 is controlled by varying the intensity.

When the charging of the amplifying unit 120 is completed, the power supply of the power module 110 is cut off to the amplifying unit 120 to prevent overcharging, and the amplifying unit 120 is filled through the notification unit to synchronize with the photographing. Inform the user that the large amount of light emission of the LED module 10 is possible.

When the shutter of the camera is pressed and the corresponding synchronization signal is transmitted by wire or wirelessly, the control unit 170 discharges the amplifying unit 120, and after the amplifying unit 120 discharges the switching unit according to the set synchronizing speed. 130 is turned on so that a large current is instantaneously applied to the LED module 10 such that the output power of the amplifier 120 and the output power of the power module 110 are simultaneously supplied to the LED module 10. Turn on the light.

When the LED module 10 receives a synchronization signal, all the LEDs 11 are turned on with a large amount of light instantaneously.

When the temperature sensed and transmitted by the temperature sensor 150 exceeds a reference temperature, the LED module 10 is blocked by blocking the power output of the power module 110 so that no more power is supplied to the LED module 10. The heat is no longer generated at a high temperature, and when the heat generation temperature of the LED module 10 falls below another reference temperature, the power of the power module 110 is output again.

In the above description of the present invention has been described with respect to the camera strobe device having a specific shape and structure with reference to the accompanying drawings, the present invention can be variously modified and changed by those skilled in the art, such modifications and changes are It should be interpreted as being within the scope of protection.

10: LED module 20: diffuser plate
30: heat sink 40: main board
100: controller 110: power module
120: amplification unit 130: switching unit
150: temperature sensor 160: feedback unit
170:

Claims (4)

LED module;
A diffusion plate disposed on the front surface of the LED module;
A radiator for dissipating heat dissipation of the LED module;
A controller for controlling the lighting of the LED module in synchronization with the shooting of the camera;

The controller
A power module for supplying a constant current or a constant voltage electrostatic source to the LED module;
An amplifier for charging and discharging the power of the power module to amplify the power supplied to the LED module;
A switching unit which is provided between the amplifying unit and the LED module to control power supply to the LED module by switching;
And a controller configured to receive a synchronization signal for camera photographing and control discharge of the amplifier and switching of the switch.

The front edge of the heat sink is formed with a stepped to engage the inner end of the diffusion plate to be assembled, the side is formed with a connecting groove connected to the stepped, the end of the connecting groove is formed with a hook hole There is,
The rear surface of the diffusion plate is formed with a connecting portion which is seated in the connecting groove is formed, the end of the connecting portion is characterized in that the hook projection which is hooked into the hook hole is hooked to protrude outward,

The front surface of the heat sink is formed with a receiving groove for receiving the LED module is seated, the bottom of the receiving groove is formed with a plurality of straight insertion holes,
PCB of the LED module is formed with a plurality of insertion holes corresponding to the insertion hole,
The insertion hole and the insertion hole has elasticity and has a medium-light back and forth narrow structure, the forward end is formed in the rear end to guide the insertion advance, the elastic portion is formed in close contact with the elastic force from the middle portion to the front end, the engaging portion is formed in the front end Strobe device for the camera, characterized in that the elastic contact member is inserted and coupled. delete The method of claim 1,
Further comprising a temperature sensor for detecting the heat of the emission of the LED module and transmitting to the controller,
The control unit is a camera strobe device, characterized in that to cut off the power supply to the LED module when the detected temperature of the temperature sensor exceeds a reference temperature. The method of claim 3, wherein
The controller
Light amount volume for adjusting the light amount of the LED module,
Strobe device for a camera, characterized in that it further comprises a notification unit for notifying the user the state of charge of the amplifier and the temperature of the temperature sensor.

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