KR101951204B1 - LED Lighting Device for Mobile Phones - Google Patents

Abstract

The LED lighting device for a mobile phone according to an embodiment of the present invention includes a plurality of LED packages each having a plurality of LED elements for emitting a white light source and controlling the current supplied to each of the LED devices to 5,500K to 5,700K And a color rendering index of 90Ra or more. It is equipped with a fixing device to be mounted on a plurality of mobile phones. By attaching a handle to the mobile phone so that it can be gripped when taking a picture, Since both the requester and the worker generate data related to color reproduction under the same illumination during reproduction, it is widely used as an LED lighting device for a mobile phone which can increase the efficiency of operation and can accurately determine the data.

Description

TECHNICAL FIELD [0001] The present invention relates to an LED lighting device for a mobile phone,

More specifically, the present invention relates to an LED lighting device for a mobile phone, and more particularly, to a color light source having a color temperature (5,500K) and a high color rendering property (90Ra or more) similar to natural light by improving the structure of a light source, , It is possible to prevent irregular reflection by a light diffusion plate and to be mounted on a plurality of mobile phones by applying a spring fixing device, and to efficiently perform color analysis efficiency, efficient management of photo data, and color reproduction among practitioners Technology.

In recent years, various mobile communication devices have become popular due to the development of the Internet, and mobile phones such as smart phones are widely used.

In addition, due to the development of IT technology, such a mobile phone has been used in various fields by various functions besides telephone functions

For example, a mobile phone is used in the field of dentistry for the treatment of teeth or in the manufacture of dental prosthesis.

In other words, in areas where collaboration is required in color management, such as dental laboratories, dental laboratories, apparel designers, and textile companies, the lighting differs from one work space to another, so that a reference color is determined due to differences in color temperature, There are many inconveniences of communication in communication.

As such a lighting device, a lighting device such as a halogen lamp, a halogen-tungsten lamp or a fluorescent lamp capable of irradiating light of a high intensity ranging from 1,500 lux to 2,500 lux (lux) is used.

By using the illumination capable of irradiating the light with such a strong illumination, the space for shadows in the work space is minimized.

However, such illumination devices such as halogen lamps, halogen-tungsten lamps or fluorescent lamps are distant from the standards required in the dental field in terms of color temperature, color rendering index and illumination. In the dental field, illumination at a color temperature of 5,500K and a color rendering index of 90Ra or more is required, but generally used illumination devices such as halogen lamps, halogen-tungsten lamps or fluorescent lamps do not meet these standards.

Here, the color temperature represents the color of the light emitted from the light source by the temperature, and is denoted by the absolute temperature (K). The lower the color temperature, the higher the ratio of red color. The higher the color temperature, the higher the blue color ratio. All objects shine and color by light. And the color of the object changes according to the color temperature and wavelength of light shining on these objects.

Since natural light at about noon has a color temperature of about 5,500K, when a light having a color temperature of about 5,500K is illuminated on an object, the object has a color similar to that seen in natural light.

However, in general, a halogen lamp has a color temperature of 2,900K to 3,000K, so it has a red color and a color temperature of 4,000K has a yellow color. Therefore, when such illumination is projected onto the teeth, the teeth are not able to have their own colors.

The CRI (Color Rendering Index) is a numerical representation of how much the color of an object seen in natural light is similar to the color seen in a specific light. It is expressed in the unit of 0Ra ~ 100Ra, and the closer to 100Ra, the closer the illumination is to the natural color.

The halogen lamp has good color rendering index of 95Ra ~ 100Ra but it does not satisfy the color temperature condition. In case of fluorescent lamp, the color rendering index is only 70Ra ~ 80Ra.

In addition, conventional illumination devices such as halogen lamps, halogen-tungsten lamps, or fluorescent lamps are diffused light, which increases the space for shadows in the work space, diffuse reflection, and difficulty in determining the internal color of teeth in dentistry There is a problem with this.

On the other hand, when making an artificial tooth at a dental laboratory, refer to the tooth photograph of the patient taken at the dental office and adjust the color of the artificial tooth most similar to the color of the patient's tooth, and refer to the brief description of the artificial tooth do.

As described above, the color of the tooth is different according to the kind of illumination that illuminates the teeth. The illumination used in the dental office and the illumination used in the dental laboratory are often different from each other. Therefore, when an artificial tooth is manufactured at a dental laboratory by referring to a photograph of a patient taken at a dental office, there is a problem that the color of the manufactured artificial tooth is often inconsistent with the teeth color of the patient.

Even in the case of illuminance representing the brightness of illumination, the light source is located close to the subject in close-up photographing due to the nature of the mobile phone. In this case, the object to be photographed may be diffused, so that it is difficult to maintain proper illuminance.

Patent application No. 10-2015-17750 (name: auxiliary light module for smartphone self-camera photography)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to efficiently communicate with a work requester and a work practitioner by providing an LED lighting device for a mobile phone and a mobile app.

Another object of the present invention is to provide an LED lighting device for a mobile phone, which prevents shadows and diffuse reflection from occurring when a patient's teeth are observed in a dental office, and can clearly identify the internal color of the teeth.

Another object of the present invention is to provide a dental laboratory which can prevent errors in color of artificial teeth from being inconsistent with the color of a patient's tooth when manufacturing artificial teeth in dental laboratories by matching the characteristics of illumination and color criteria used in dental clinics and dental laboratories A light emitting diode (LED) illuminating device.

It is a further object of the present invention to provide a method and apparatus for color matching that can be widely used in fields related to color work in various industrial fields in addition to dental and dental engineering work and prevent color operation errors due to lighting devices in different work spaces of job requesters and work practitioners , The details of the operation can be easily transmitted through the memo function of the application and the voice recording of the moving picture, and it is possible to efficiently store and manage such data, thereby preventing the rework and improving the work efficiency. .

According to an embodiment of the present invention,

A main body 105 to which power is applied; A fixing part 170 provided at a lower portion of the main body 105 and detachably coupled to the mobile phone; An illumination unit 130 connected to the front of the main body 105 to emit light when DC power is applied; And a connection bar 135 connecting the main body 105 and the illumination unit 130.

The illumination unit 130 includes a base 142 mounted at the tip of the connection bar 135; A pair of LED mounting portions 120 movably mounted on the base 142 to emit light; An LED package 140 disposed on the pair of LED mounting portions 120 and emitting light; A pair of guide bars 155 arranged in the radial direction from the base 142 and supporting the pair of LED mounting portions 120 movably in the radial direction inward or outward; And a power control unit 160 for controlling power of the LED package 140.

The LED package 140 is characterized by using an achromatic light source.

A guide groove h is formed on the bottom surface of the pair of LED mounting portions 120. The guide groove h is slidably coupled to the upper surfaces of the pair of guide bars 155. [

The fixing portion 170 includes a pair of fixing plates 172; And a spring (not shown) disposed between the pair of fixing plates 172 to elastically pull the fixing plate 172 inward.

The LED package 140 has a color temperature of 5,500K to 5,700K and a color rendering index of 90Ra or more.

In the LED package used for the LED lighting device for mobile phones, the anode of the LED element can be commonly used, and the cathode can be used separately.

The LED lighting device for a mobile phone may include a power supply unit for supplying power, a control unit for supplying power suitable for the LED device, and an LED driving unit for driving the LED package 140 according to a signal of the control unit.

At this time, the control unit applies a voltage of 2.9 V to the one LED device, and the LED driver controls the current to flow to the LED device by about 10 mA.

The LED lighting device for a mobile phone according to an embodiment of the present invention has the following advantages.

First, we developed LED light source with color temperature of 5,500K ~ 5,700K, color rendering index of 90Ra or more, light close to natural light (5,500K), and light intensity of 650Lux ~ 700Lux when measuring 10cm distance from light source, Can be effectively used in color reproduction work.

Second, by using an LED lighting device for mobile phones with a high straightness and a light diffusion plate, it is possible to prevent shadows and diffuse reflection when observing a patient's teeth in a dental office, .

Third, because LED lighting devices and mobile apps for mobile phones with the same characteristics can be used in the dental office and dental laboratory, differences in lighting used in the dental office and dental laboratories cause the color of artificial teeth It can provide accuracy and efficiency in the manufacture of esthetic prostheses by avoiding discrepancies in the color of the patient's teeth.

Fourth, when the light source is analyzed with reference color, it is advantageous when color analysis is performed through the ring structure. When photographing, it is symmetrically divided into two types of light sources, so that the contour of the object is clearly captured. If the work is done, communication between the worker and the worker can be facilitated and work efficiency can be improved by preventing rework.

Fifth, the dental office uses mobile light source of natural light specification to accurately determine the color of the patient's teeth, analyze the color using the application, and utilize the imaging and editing functions of other materials necessary for artificial tooth production. , It is possible to accurately determine the color of the patient's teeth in the dental laboratory and to produce an artificial tooth faithful to the requirements of the client's dental office.

Sixth, by using DC as the power source of the light source, it is possible to observe the color of the tooth precisely by preventing flickering.

Seventh, it can be applied to mobile phones of various sizes by applying a spring-type fixed portion.

FIG. 1 (a) is a perspective view of an LED lighting device for a mobile phone according to an embodiment of the present invention, and FIG. 1 (b) is a view illustrating a state in which the LED mounting portion moves in an outward direction.
2 is a cross-sectional view illustrating an LED device used in the LED lighting device for a mobile phone shown in Fig. 1 (a).
3 is a diagram showing an LED package and its circuit diagram used in an LED lighting device for a mobile phone.
4 is a graph showing a change in color temperature of light emitted from the LED device on a black body radiation line according to an amount of current applied to the LED device.
Fig. 5 is an enlarged view showing the vicinity of the blackbody radiation line in Fig.
6 is a circuit diagram of the LED lighting device for a mobile phone shown in Fig.
FIG. 7 is a view showing the state in which the LED mounting portion shown in FIG. 1 (a) is slidably coupled to the guide bar.
8A is a view showing a state in which the LED attaching portion is rotated 90 degrees in the radially outward direction, and FIG. 8B is a view showing a state in which the LED attaching portion is rotated in a 90 degree state .
Fig. 9 is a view seen from the line "AA" in Fig. 8 (b).

Hereinafter, an LED lighting device for a mobile phone according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the LED illumination device 100 proposed by the present invention can be used in various fields. For example, the LED illumination device 100 will be described in connection with dental and dental applications.

The LED lighting device 100 for a mobile phone includes a main body 105 in which a power source, a power terminal, and a switch are disposed; A fixing portion 170 provided at a lower portion of the main body 105 and detachably coupled to the mobile phone M; An illumination unit 130 connected to the front of the main body 105 and emitting light; And a connection bar 135 connecting the main body 105 and the illumination unit 130.

In the LED lighting device 100 for a mobile phone having such a structure,

The main body 105 is provided with a handle 110 so that the user can grasp it. A power supply unit 150 for supplying power is provided inside the handle 110.

In this case, various types of power supply methods may be applied to the power supply unit 150, and the power supply unit 150 preferably includes a method of supplying power by a battery 111. The battery 111 supplies the DC power, and the DC power is supplied to the illumination unit 130 through the power terminal 112.

As the DC power is supplied to the illumination unit 130, it is possible to eliminate flicker when observing the patient's teeth, so that the color of the teeth of the patient can be accurately observed.

A power switch 113 is provided on the side surface of the main body 105 to turn on or off the power of the illumination unit 130.

In addition, the fixing part 170 may be provided at the lower part of the handle 110 so as to be detachably coupled to the upper part of the mobile phone.

At this time, the fixing portion 170 may have a spring structure so that it can be combined and combined with mobile phones of various sizes.

That is, the fixing portion 170 is constituted by a pair of fixing plates 172, and a spring (not shown) is arranged between the pair of fixing plates 172 in the lateral direction. The spring elastically pulls the pair of fixing plates 172 inward.

Therefore, when the lighting device for a mobile phone is fixed to the upper portion of the mobile phone M, after the pair of fixing plates 172 are pulled to the both sides and the upper portion of the mobile phone M is lifted, The fixing plate 172 can be fixed by returning to the home position by the restoring force of the spring.

Meanwhile, the illumination unit 130 includes a base 142 mounted at the tip of the connection bar 135; A pair of LED mounting portions 120 movably mounted on the base 142 to emit light; An LED package 140 disposed on the pair of LED mounting portions 120 and emitting light; A pair of guide bars 155 arranged in the radial direction from the base 142 and supporting the pair of LED mounting portions 120 movably in the radial direction inward or outward; And a power control unit 160 for controlling power of the LED package 140.

In more detail, the base 142 is circularly disposed at the tip of the connecting bar 135 to support the LED mounting portion 120.

In this base 142, a pair of guide bars 155 are disposed outward along the radial direction.

In addition, the pair of LED mounting portions 120 have a hollow ring shape. The pair of LED mounting portions 120 are composed of two LED mounting portions 120 each having a semi-circular shape and are movable independently of each other.

Accordingly, the pair of LED mounting portions 120 can move inward or outward along the pair of guide bars 155.

At this time, the pair of LED mounting portions 120 can be coupled to the upper portions of the pair of guide bars 155 in various manners such as the male and female coupling.

7, a guide groove h is formed on the bottom surface of the LED mounting portion 120. The guide groove h is formed on the guide rail r formed on the pair of guide bars 155 ).

Therefore, the guide groove h of the LED mounting portion 120 can be moved in the inner or outer direction along the radial direction while being inserted into the guide rail r of the guide bar 155. [

Since the pair of LED mounting portions 120 can move inward and outward along the guide bar 155, the position of the LED mounting portion 120 can be appropriately changed in accordance with the lighting environment and the like.

In addition, the pair of LED mounting portions 120 are rotatable by 90 degrees as shown in Figs. 8 (a) and 8 (b).

More specifically, a base 142 is connected to the tip of the connection bar 135, and this base has a two-layer structure.

That is, the base includes a lower base 143 connected to the tip of the connecting bar 135; And an upper base 144 rotatably disposed on an upper portion of the lower base 143 and on which a pair of guide bars are mounted.

In the base 142, a guide groove 148 is formed in the upper surface of the lower base 143 along the circumferential direction. A rail 146 protrudes from the upper surface of the upper base 144, As shown in Fig.

Thus, the rails 146 of the upper base 144 can rotate along the guide grooves 148 of the lower base 143. Of course, in the above description, the rails protrude from the upper base 144 and the guide grooves are formed in the lower base 143. However, the present invention is not limited thereto and can be reversed. That is, a guide groove is formed in the upper race and a rail is formed in the lower race.

Alternatively, a structure in which the upper race is rotatable by arranging the bearings between the upper and lower races is also possible.

When the upper race 144 rotates as described above, the pair of guide bars 155 mounted on the pair of guide bars 155 rotates together. Thus, a pair of the LED mounting portions 120 mounted on the pair of guide bars 155, Can rotate as well.

As a result, the illumination angle of the illumination unit 130 can be changed to 90 degrees by rotating the LED mounting unit 120 by 90 degrees.

In addition, the angle of the illumination can be variously changed by moving each of the LED mounting portions 120 in the radial direction along the guide bar 155 while rotating the LED mounting portion 120 by 90 degrees.

Therefore, it is possible to appropriately adjust the angle of illumination in the horizontal direction or the vertical direction depending on the photographing purpose.

A plurality of LED packages 140 are annularly mounted on the respective LED mounting portions 120. The present invention is not limited to this, but the LED package 140 may be mounted on or below the LED package 140, Can be mounted.

The illumination unit 130 is formed in an achromatic color as a whole. The reason why the LED lighting device 100 for a mobile phone is formed in an achromatic color is that when the color of the tooth is discriminated by using the light of the LED lighting device 100 for a mobile phone, So as to prevent interference with the color of the light.

A light diffusion plate 141 is mounted on an outer circumferential surface of the LED package 140 (110).

The light diffusing plate 141 diffuses the light emitted from the LED element 130 to prevent irregular reflection which may be generated on the tooth surface when the straight light is irradiated on the tooth, So as to prevent it from being photographed.

At this time, the LED package 140 preferably emits white light.

As shown in FIG. 2, a manufacturing method of the LED device 130 mounted on the LED package 140 will be described. A nitride semiconductor 135 is stacked on the engine 131.

The nitride semiconductor 135 includes an n-type semiconductor layer 136, an active layer 137, and a p-type semiconductor layer 138.

At this time, a buffer layer 132 may be grown between the nitride semiconductor 135 and the substrate 131. The buffer layer 132 may be a low-temperature grown GaN layer, an AlN layer, or the like for reducing the lattice mismatching and the thermal expansion coefficient of the material. .

The n-type semiconductor layer 136, the active layer 137 and the p-type semiconductor layer 138 are formed by a vapor deposition method such as MOCVD (Metal Organic Chemical Vapor Deposition), MBE (Molecular Beam Epitaxy), or HVPE (Hydride Vapor Phase Epitaxy) Can grow.

The n-type semiconductor layer 136, the active layer 137, and the p-type semiconductor layer 138 may be grown at a temperature of 700 to 1100 ° C. Specifically, the substrate 131 may be a sapphire (Al 2 O 3) substrate, a silicon carbide (SiC) substrate, a silicon (Si) substrate, a gallium arsenide (GaAs) substrate, or the like. Especially, a sapphire substrate may be used.

And the n-type semiconductor layer 136 is an n-doped semiconductor material having an AlxInyGa (1-xy) N composition formula (where 0? X? 1, 0? Y? 1, 0? X + y? 1) N-GaN can be used.

The active layer 137 has a multi-quantum well (MQW) structure and may be made of GaN or InGaN

The p-type semiconductor layer 138 is formed of an AlxInyGa (1-xy) N composition formula (0? X? 1, 0? Y? 1, 0? X + y? Lt; / RTI > and is p-doped.

On the other hand, a transparent electrode 139 is formed on the p-type semiconductor layer 138 to improve ohmic characteristics, and a p-electrode is formed on the transparent electrode.

Then, an n-electrode is formed on the n-type semiconductor layer exposed by mesa etching.

When voltage is applied to the p-electrode and the n-electrode in the LED device 130, electrons supplied from the n-type semiconductor layer and holes supplied from the p-type semiconductor layer flow into the active layer having a different indium composition, - Hole recombination occurs and emits white light.

At this time, the color of the emitted light changes drastically according to the amount of current flowing in the LED device 130. When a small amount of current flows through the LED element 130, electrons and holes are mainly coupled in a region where the indium composition is relatively large, so that red light having a small energy and a long wavelength is mainly emitted. When a large amount of current flows, electrons and holes mainly combine in a region where the indium composition is relatively small, so that blue light having a large energy and a short wavelength can be mainly emitted.

2 is used to form the LED package 140 for use in the LED lighting device 100 for a mobile phone. FIG. 3 illustrates an LED package 140 used in the LED lighting device 100 for a mobile phone, And shows the circuit diagram thereof.

In this case, in the case of the LED package 140 used in the LED lighting device 100 for a mobile phone, three LED elements 130 are packaged to form one LED package 140 as shown in FIG.

At this time, as shown in 3, three LED elements 130 are disposed on the substrate 141, and then an LED package 140 connected to the terminals 142 is manufactured.

At this time, as shown in the circuit diagram, the anode 145 of the three LED elements 130 is commonly used and the cathode 146 is used separately.

FIG. 4 is a graph showing a change in the color temperature of light emitted from the LED device on the blackbody radiation line according to the amount of current applied to the LED device. FIG. 5 is a graph will be.

As shown in FIG. 5, when a small amount of current flows through the LED element 130, red light having a low color temperature is mainly emitted. When a large amount of current flows through the LED element 130, Blue light is mainly emitted.

As shown in FIG. 5, the B3 region and the B4 region have color temperatures of 5300K to 5600K near the blackbody radiation line.

A voltage of about 2.9 V, preferably 2.9 V, is applied to each LED device 130 in the LED package 140 used in the LED device 100 for a mobile phone. ), A light close to the B3 region and the B4 region, especially the color of daylight (5550K), is emitted from the LED element 130 through experiments. At this time, a current of 30 mA flows in one LED package 140 and one LED package 140 emits light having a color rendering index of about 90Ra.

Accordingly, the LED lighting apparatus 100 for a mobile phone of the present invention has a circuit for allowing a current of 10 mA to flow through the LED element 130. [

6 is a circuit diagram of the LED lighting device for a mobile phone shown in Fig.

6, the LED lighting apparatus 100 for a mobile phone includes a power supply switch 113, a power supply unit 150 for supplying power to various components installed in the mobile phone LED illumination apparatus 100, A control unit 160 for supplying an appropriate power to the LED to drive the LED package 140 according to the power of the power supply unit 150 and a driving unit 161 for driving the LED according to the signal of the control unit 160 Respectively.

The controller 160 controls the power source using a PFM (Pulse Frequency Modulation) mode of 2.0 MHz switching frequency so as to supply power suitable for the LED driver 161. The LED driver 161 drives the LED package 140, So that a current of 10 mA flows through the LED element 130. [

Through the above-described control, the LED lighting apparatus 100 for a mobile phone can emit light close to the daylight color (5500K).

Claims (6)

A main body 105 to which power is applied;
A fixing portion 170 provided at a lower portion of the main body 105 and detachably coupled to the mobile phone M;
An illumination unit 130 rotatably connected to the front of the main body 105 to emit light when DC power is applied; And
And a connection bar 135 connecting the main body 105 and the illumination unit 130,
The illumination unit 130 includes a base 142 mounted on the tip of the connection bar 135 and having a ring shape;
A pair of LED mounting portions 120 movably mounted on the base 142 to emit light and having a ring shape;
An LED package 140 disposed on the pair of LED mounting portions 120 and emitting light;
A pair of guide bars 155 arranged in the radial direction from the base 142 and supporting the pair of LED mounting portions 120 movably in the radial direction inward or outward; And
And a power control unit (160) for controlling power of the LED package (140). delete The method according to claim 1,
The base 142 has a lower base 143 connected to the tip of the connecting bar 135; And an upper base 144 rotatably disposed on an upper portion of the lower base 143 and on which a pair of guide bars 155 are mounted,
A guide groove 148 is formed on the upper surface of the lower base 143. A rail 146 protrudes from the upper surface of the upper base 144 and is rotatably coupled to the guide groove 148, (144) is rotatable with respect to the lower base (143). The method according to claim 1,
A guide groove h is formed on the bottom surface of the pair of LED mounting portions 120 and the guide groove h is slidably coupled to the upper surfaces of the pair of guide bars 155. [ Lighting device. The method according to claim 1,
The fixing portion 170 includes a pair of fixing plates 172; And a spring disposed between the pair of fixing plates (172) to elastically pull the fixing plate (172) inward. The method according to claim 1,
The LED package 140 is an achromatic light source having a color temperature of 5,500K to 5,700K and a color rendering index of 90Ra or more.

Images