KR200475527Y1 - A lighting device having leds and optical fibers, and a lighting appliance - Google Patents

Abstract

An illumination device (10) having an LED and an optical fiber includes a first LED (11a) arranged to emit white light having a first color temperature and a second LED (11b) arranged to emit white light having a second color temperature different from the first color temperature A harness 13 of an optical fiber arranged to transmit the light generated by the first LED and the second LED to the illumination irradiator 20, 11a and 11b so that each of the illumination irradiating units 20 changes the power supply current of the LEDs 11a and 11b from the first color temperature to the second color temperature by changing the power supply current of the LEDs 11a and 11b. And is suitable for generating white light having a color temperature that can be adjusted over a range up to the second color temperature.

Description

TECHNICAL FIELD [0001] The present invention relates to a lighting apparatus and a lighting apparatus having an LED and an optical fiber,

The present invention relates to a lighting apparatus having an LED and an optical fiber, and more particularly to a device for illuminating a medical surgical field.

In medical situations, especially in the operating room, the lighting conditions need to be adjusted to allow the surgeon or doctor to work correctly.

In particular, lighting should enable surgeons to differentiate between different types of tissue. To this end, white light typically has to conform to a variety of standards and provide a color rendering index in the range of 85-100 and a color temperature in the range of 3000K to 6700K.

More specifically, the term "color temperature" in light refers to the equivalent color temperature conventionally evaluated based on the hue coordinates (x, y) of light in the tint chart of the International Commission on Illumination Is used.

Also, good lighting should be able to change the color temperature so that the physician applies it as a requirement.

Currently, there are various types of lighting devices that meet the requirements by mixing white light and color light to obtain white light dimming at variable color temperatures.

Conventionally, a light flux from a light source, for example a light emitting diode (LED), is defined as the light power emitted by the light source (represented by the lumen), and the visible light intensity of the illumination device in the light modulation field is defined as the unit area Is defined as the amount of light flux illuminating the per-illumination field (represented as lux, e.g., ㏐ / ㎡).

In particular, the patent document US 6 513 962 discloses a lighting apparatus as described above in which two light sources, namely a halogen lamp emitting white light and an LED emitting red light are used. In that document, the two light sources are coupled to an optical fiber connected to a light guide which serves to uniformly mix the white light and the red light in an appropriate ratio to obtain white light control of good quality. However, the apparatus is required to measure the color temperature of the dimming light so as to adjust the ratio of the white light and the red light, which is very complicated to execute.

There is also an illumination device using a plurality of white LEDs and a color LED, for example a green or red LED, as the light source, each LED being coupled to an optical lens for focusing in the dimming field and having an adjustable color temperature A white light source is formed together. However, it is difficult to obtain uniform illumination in such a type of apparatus, and the dimming of the surgical field changes with the function of the color temperature selected by the surgeon. In addition, such a type of illuminator provides a major drawback in generating color shading within the surgical field when a portion of the dim light is blocked, for example, by the physician's head.

It is also known that LEDs degrade in a manner that varies with their color, and in particular red LEDs degrade faster than white LEDs, causing problems with light flux from LEDs that change over time.

Patent document DE 10 2006 040393 describes an example of such an improved illumination device in which white and color LEDs are coupled together to a common focal optic lens which enables good quality white light to be obtained for dimming. The light guide may be interposed between the LED and the focus optical lens to improve color mixing. However, such a device does not overcome the problems associated with variable degradation of the LED as a function of color, reducing the formation of color shadows only partially in the dimming field.

The object of the present invention is to provide a simple illumination device suitable for providing an excellent illumination condition for the surgeon or physician and, in particular, to provide uniform illumination regardless of the selected color temperature, stable color modulation over time To improve all such disadvantages.

The idea based on the present invention relates to a lighting device having the same two white LEDs, for example, except that it provides different color temperatures. The optical fiber harness with two head bundles is coupled to two white LEDs. The harness may have an arm that transmits light originating from a white LED, and the number and diameter of the arms depend on the harness. Each arm is coupled to an illuminating portion, which may be provided with an optical focus lens for focusing the light within the surgical field. From the harness to the irradiation part, the white light is obtained by mixing together the two white lights generated by the LEDs, and it is possible to adjust the color temperature of the irradiation part light flux by appropriately adjusting the power supply current for each LED.

More specifically, the present invention relates to a surgical lighting apparatus (10) using an LED, comprising a first LED (11a) arranged to emit white light having a first color temperature, a second LED A second LED (11b) arranged to emit white light having a color temperature, and power supply means (17a, 17b) adapted to power the LEDs (11a, 11b) with different currents , The first LED and the second LED are coupled to a plurality of illuminating parts 20 of the illuminating device by an optical fiber harness having two head bundles 15a and 15b of optical fibers and a plurality of illuminating part bundles 18 of optical fibers And two fiber optic head bundles 15a and 15b are individually coupled to the first and second LEDs 11a and 11b and the irradiation bundle is individually coupled to the illumination irradiation part, The optical fiber of the bundle is fused in the harness Each illuminating section 20 is configured to change the individual current to which the LEDs 11a and 11b are supplied with power because each illuminating section bundle 18 has the same proportion of optical fibers originating from each of the head bundles, To produce white light having a color temperature that can be adjusted over a range from the first color temperature to the second color temperature.

In this arrangement, it is easy to obtain white light in the illuminating part which provides uniform dimming over the entire range of color temperatures, and no color shade is formed in the surgical field when the obstruction is present in the light flux. In addition, no problem arises for the light flux that changes over time as a result of the LEDs of different colors being degraded in different ways.

Also, the LED may be remotely located from the illumination section to obtain compatibility between the overhead light and the light flux required in the operating room. Also, by being remotely positioned, the LEDs do not interfere with the surgeon's vision, allowing the surgeon to enjoy better general visual comfort.

The lighting device of the present invention can preferably provide the following features:

The power supply means is arranged to vary the individual currents delivered to the LEDs according to the communicating-vase principle, thereby enabling the dimming to be maintained constant, preferably when changing the color temperature from the illumination section.

Each LED has a color temperature in the range of 3000K to 6700K, and each LED can have a color rendering index in the range of 85-100, preferably 90-100.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood with reference to the following detailed description of an embodiment given in the accompanying drawings and given as a non-restrictive example.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic perspective view of a lighting fixture for lighting and a surgical field and including a lighting fixture of the present invention.
2 is a detailed schematic view of the illumination device of FIG.
Fig. 3 shows an example of the current passing through the LED of the illuminator of Fig. 2 to obtain various different color temperatures at the illuminating part.

Fig. 1 shows a lighting device 1 for illuminating the surgical field 2 for dimming, wherein the field is where the doctor operates the patient.

In this example, the luminaire 1 is of a type that is suspended from the ceiling of the operating room in a conventional manner and comprises two hinge-like suspension arms 3, each holding an overhead light 4, for example. As can be seen in FIG. 1, each light 4 may provide a plurality of illuminating units, such as reference numeral 20, of the lighting system of the present invention.

2 is a detailed schematic diagram of an embodiment of the lighting device 10 of the present invention.

In this embodiment, the illumination device 10 comprises two light sources and each includes individual LEDs 11a, 11b emitting white light. The two LEDs 11a and 11b are individually coupled to the two head bundles 15a and 15b of the optical fiber in the optical fiber harness 13. [ The LEDs 11a and 11b may be directly pressed against the head of the harness 13 or may be coupled through focus optic lens elements 14a and 14b such as a lens, a prism, a reflector, a collimator, or the like or a combination thereof. The LEDs 11a and 11b are preferably connected to the cooling radiators 12a and 12b from the head of the harness 13 by using, for example, thermal grease.

The optical fibers in the two head bundles 15a and 15b are connected to a plurality of irradiation bundles 18 of optical fibers coupled to the individual illumination irradiating portions 20 via individual focus optical lens elements or harnesses 13, (E. G., Mixed) within body 16 of body < / RTI > Such an optical lens element may be a lens, a prism, a reflector, a collimator, or the like, or a combination thereof.

It can thus be seen that the harness 13 has two head bundles 15a and 15b and a plurality of irradiation bundles 18, for example 32, and 64 irradiation bundles 18. It should be understood that the harness 13 may have hundreds or even thousands of optical fibers. Preferably, the optical fiber of the harness 13 is made free of the harness of the optical fiber, which may have a considerable length, contributes to good illumination efficiency without weakening red and also reduces the risk of any ignition of the harness. It should also be noted that for better efficiency of the harness 13 the optical fiber of the harness 13 is hot-fused together in the harness 13 and the use of an optical fiber with a large receiving angle desirable.

The crossing or mixing of the optical fibers in the harness 13 achieves a uniform distribution of the fibers so that each irradiance bundle 18 can be divided into two head bundles 15a and 15b, One half from the head bundle 15a and the other half from the head bundle 15b.

Figure 2 shows a schematic view of two of the 16 irradiation bundles 18 for fitting to two parts of the overhead lights 4 or overhead lights 4, for example starting from two head bundles 15a, Of the optical fibers in the harness 13 defining the groups 19a, 19b.

In the present invention, the LEDs 11a, 11b are powered by a power supply arranged to deliver different currents to the LEDs 11a, 11b in an independent manner. The power supply means may be in the form of a single power supply, or in the form of two other power supplies 17a, 17b as shown in Fig.

The LED 11a of the first light source emits white light having the first color temperature and the LED 11b of the second light source emits white light having the second color temperature different from the first color temperature . Thus, white light having a middle color temperature between the first color temperature and the second color temperature is obtained from the illuminating unit 20, and the total light flux from the illuminating unit 20 is reflected by the two LEDs 11a and 11b. (In the fiber upon coupling between the fiber and the focal optical lens element or the like) to the individual light flux from the optical fiber.

The selected white LED should have a high color rendering index in the range of 85 to 100, preferably 90 to 100, actually 95 to 100, and a color temperature in the range of 3000K to 6700K. By way of example, LED 11a may have a color temperature of 3000K, and LED 11b may have a color temperature of 5000K. This provides dimming with white light at a medium color temperature of about 3900K when all of the LEDs 11a, 11b are individually powered by the same current.

Preferably, the LEDs 11a, 11b are selected so that their geometric shapes are identical except for their color temperature so as to avoid any other difference in light flux between the LEDs 11a and 11b. The difference between the LEDs can be, for example, in the mixed structure of the phosphorus forming the LED. In particular, it is desirable to select, for example, LEDs from the same package, the same electronic chip, and from the same feeder requiring the same type of power supply.

Therefore, it can be understood that the illumination device 10 of the present invention has only white light, so that no color shade can occur in the surgical field 2 even if an obstruction exists in the light flux from the illumination device to the irradiation part There will be.

The present invention is based on the fact that the light flux from the LED depends on the current passing through the LED. The light flux from each LED 11a and 11b can be changed by changing the current to which the two LEDs 11a and 11b are separately powered and consequently the first color temperature of the LEDs 11a and 11b It is possible to obtain light from the illumination irradiating part 20 that provides an intermediate temperature that can be always adjusted over a range from the first color temperature to the second color temperature.

In the present invention, the current supplying power to the LEDs 11a and 11b individually causes the individual light fluxes from the LEDs 11a and 11b to change according to the communicating tube principle, in other words, The dimming of the field 2 is kept constant while changing the middle color temperature from the illuminating unit 20. [ The term "constant" is used to mean that the light flux is equal to within 5%.

Thus, the lighting system 10 of the present invention is uniform and constant, and by suitably varying the current that powers the LEDs 11a, 11b appropriately, it is possible to vary the first color temperature of the LED 11a to the second color temperature of the LED 11b It will be appreciated that a light flux having a white light that provides a color temperature that can be adjusted up to the color temperature, can be obtained at the illumination irradiating portion 20.

3 is a graph showing the relationship between the various color temperatures of the illuminating light from the illumination irradiating part 20 when the color temperature is obtained with different currents that supply power to the LEDs 11a and 11b in such a manner as to maintain a constant total light flux in the illuminating part 20. [ Fig. From this chart, it can be seen that the appropriate current for supplying power to the two LEDs 11a, 11b varies according to the communicator principle, i.e., in some complementary but complementary and contradictory manner.

The chart of FIG. 3 can be obtained by measuring the light spectrum generated by the illumination unit 20 with the spectroscope and based on the spectrum and by evaluating the color temperature of the light generated by the illumination unit 20 in a conventional manner. This enables the illumination device 10 to be calibrated by specifying the power supply current to be delivered to the LEDs 11a, 11b for each color temperature in the illumination irradiator 20. [

3, the color temperature of the light flux in the illuminating unit 20 in the LEDs 11a and 11b having the individual color temperatures of 5000K and 3000K is changed stepwise from about 3400K to about 4500K in this example, 11a, 11b can be powered with a current in the range of about 200 mA to about 900 mA.

For example, a color temperature of about 3400K is obtained at illumination source 20 when power is supplied at about 200mA with an LED having a color temperature of 5000K and at about 900mA with an LED having a color temperature of 3000K. Which corresponds to an arbitrary light flux from the illuminating unit 20. [

By way of example, to increase the current supplying power to the LED with a color temperature of 5000K to about 450mA and to obtain a color temperature of about 3800K from the illuminating unit 20 while maintaining the same light flux from the illuminating unit 20, Lt; RTI ID = 0.0 > 600mA. ≪ / RTI >

In a variant, it is possible to provide a sensor, for example a spectrometer, for measuring the color temperature of the light from the illumination irradiating part 20 so as to optimize the electric current supplying the LEDs 11a and 11b, respectively.

It is to be understood that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention.

As described above, the LEDs 11a and 11b may be remote from the overhead light 4 for dimming the surgical field 2, for example, may be located outside the operating room, And can provide benefits in terms of hygiene. This also improves the compatibility of the light 4 in the light flux used in the operating room by providing a major advantage in terms of temperature since the overhead light 4 no longer contains the heat source and thus remains cooled. .

Alternatively, the LEDs 11a, 11b and the harness 13 of the lighting device 10 of the present invention may be located entirely inside the overhead light 4, so that they have harnesses that pass along the suspension arms 3 Can be avoided.

Depending on the power of the LEDs available on the market and the desired optical power, it is possible to mount one or more LEDs in each light source. Using a very powerful LED (e.g. 13W or 41W), it is possible to provide economical and ecological advantages by reducing the size of the electronic card.

Without departing from the scope of the present invention, the harness 13 may include a larger number of head bundles 15a, 15b, preferably a multiple of two, and each head bundle may have one LED. It is then preferred that all head bundles 15a, 15b are connected inside a single body 16 of the harness 13.

It is also possible to provide a plurality of harnesses 13 fitted to a single overhead light 4.

Claims (4)

A surgical illumination device (10) using an LED,
A first LED (11a) arranged to emit white light having a first color temperature,
A second LED (11b) arranged to emit white light having a second color temperature different from the first color temperature, and
An apparatus comprising power supply means (17a, 17b) adapted to power the LEDs (11a, 11b) with different currents,
The first LED and the second LED are connected to a plurality of illumination irradiating portions 20 of the illuminating device by an optical fiber harness 13 having two head bundles 15a and 15b of optical fibers and a plurality of irradiating portion bundles 18 of optical fibers Two optical fiber head bundles 15a and 15b are respectively coupled to the first LED and the second LED 11a and 11b and the irradiation bundle is coupled to each of the illumination irradiation sections, The optical fibers of the bundles are cross-connected in a uniform manner within the harness 13 such that each irradiation bundle 18 has the same proportion of optical fibers originating from each of the head bundles, And 11b produce white light having a color temperature that can be adjusted over a range from the first color temperature to the second color temperature by varying the respective currents supplied thereto, (10). The method according to claim 1,
Wherein the power supply means (17a, 17b) are arranged to vary respective currents delivered to the LEDs (11a, 11b) according to the principle of communicating tubes. 3. The method according to claim 1 or 2,
Characterized in that each LED (11a, 11b) has a color temperature in the range of 3000K to 6700K. The method of claim 3,
Characterized in that each LED (11a, 11b) has a color rendering index in the range of 90-100.

Images