JP3183914U - Lighting device having LED and optical fiber, and lighting fixture - Google Patents

Abstract

A simple surgical lighting device suitable for providing a surgeon or doctor with a good lighting situation is provided.
A lighting device having an LED and an optical fiber, the first LED generating a white light having a first color temperature, and a white having a second color temperature different from the first color temperature. A second LED 11b that generates light, an optical fiber harness 13 that carries the light generated by the first and second LEDs to the illumination outlet 20, and a power supply means 17a that supplies different currents to the LEDs 11a and 11b, respectively. As a result, each illumination outlet 20 has a white color temperature that can be adjusted over a range from the first color temperature to the second color temperature by changing the power supply current of the LEDs 11a, 11b. Produce light.
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Description

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

  In medical situations, especially in operating rooms, lighting conditions need to be adapted so that the surgeon or physician can operate accurately.

  In particular, the illumination needs to allow the surgeon to distinguish between different types of tissue. For this purpose, generally white light must meet various standards and provide light with a color rendering index (CRI) in the range of 85 to 100 and a color temperature in the range of 3000 Kelvin (K) to 6700K. I must.

  More specifically, the term “color temperature” of light means the corresponding color temperature evaluated in a conventional manner based on the color coordinates (x, y) of the light in the International Commission on Illumination (CIE) color diagram. As used herein.

  In addition, good lighting must allow the surgeon to change the color temperature to meet the requirements.

  Currently, there are various types of lighting devices that meet these requirements by mixing white light and colored light to obtain white illumination with variable color temperature.

In the conventional method, for example, a light flux from a light source such as a light emitting diode (LED) is defined as light power (expressed in lumens) emitted by the light source, and the visible illumination of the illumination device in the illumination area is illumination per unit area. It is defined as the amount of luminous flux that illuminates the area (expressed in lux, ie lumens per square meter (lm / m ² )).

  In particular, the patent document US Pat. No. 6,513,962 discloses the illumination device described above, and uses two light sources, a halogen lamp that emits white light and an LED that emits red light. In this document, the two light sources are coupled to an optical fiber that is connected to a light guide that serves to mix white light and red light uniformly and in an appropriate ratio to obtain good quality white illumination. Nevertheless, the device requires measurement of the color temperature of the illumination light in order to adjust the proportion of white light and red light, which is very complicated to perform.

  There are also lighting devices that use multiple white LEDs and colored LEDs such as green or red LEDs as light sources, each LED being coupled to an optical system for focusing on the illumination area and adjustable together A white light source having a color temperature is formed. Nevertheless, with this type of device it is difficult to obtain uniform illumination, and the illumination of the surgical area varies depending on the color temperature selected by the surgeon. In addition, this type of illumination device has the major drawback of creating a colored shadow in the surgical area when part of the illumination light is blocked, for example by the surgeon's head.

  Furthermore, it is known that LEDs deteriorate with time in various ways depending on colors, and in particular, red LEDs deteriorate with age faster than white LEDs, thus causing a problem that the luminous flux from the LEDs changes with time.

  The patent document DE 102006040393 discloses an example of such an improved illumination device, where both white and colored LEDs are coupled to a common focus optics that can obtain good quality white light for illumination. Is done. A light guide may be interposed between the LED and the focus optics for improved color mixing. Nevertheless, that type of device only partially reduces the formation of colored shadows in the illumination area and cannot overcome the problems associated with various aging of LEDs depending on the color.

US Pat. No. 6,513,962 German Patent No. 102006040393

  The object of the present invention is to remedy all of these drawbacks by proposing a simple lighting device suitable for providing a surgeon or doctor with a good lighting situation, in particular for the selected color temperature. It is to provide illumination that is uniform, stable over time, and does not produce colored shadows in the surgical area.

  The concept on which the present invention is based is an illuminating device having two white LEDs that are identical except for having different color temperatures, for example. An optical fiber harness having two head bundles is coupled to two white LEDs. The harness may have arms that transmit light coming from the white LED, and the number and diameter of the arms depends on the harness. Each arm is coupled to an illumination outlet that can be provided with focusing optics for focusing light in the surgical area. At the exit from the harness, the white light coming from mixing together the two white lights generated by the LEDs is obtained, and the color temperature of the exit luminous flux is adjusted by appropriately adjusting the power supply current for each LED Can do.

  More particularly, the present invention provides a surgical lighting device using an LED, the lighting device having a first LED configured to generate white light having a first color temperature, and the first LED. A second LED adapted to generate white light having a second color temperature different from the color temperature, and power supply means adapted to supply different currents to the LED, the first and The second LED is coupled to a plurality of illumination outlets of the illuminator by an optical fiber harness having two head bundles of optical fibers and a plurality of exit bundles of optical fibers, and the two optical fiber head bundles are respectively the first and the first bundles. Coupled to two LEDs, the outlet bundle is respectively coupled to the illumination outlet, and the optical fibers of the two head bundles have the same proportion of optical fibers, each outlet bundle coming from each of the head bundles Uniformly cross-connected in the harness so that each lighting outlet is regulated over the range of the first color temperature to the second color temperature by changing the respective currents to which the LEDs are powered Suitable for producing white light with a color temperature that can be.

  This arrangement facilitates obtaining white light at the illumination outlet with uniform illumination over the entire range of color temperatures, and no colored shadows are formed in the illuminated area when there is a hindrance to the light flux. In addition, there is no longer a problem of time-varying luminous flux as a result of differently colored LEDs that age in different ways.

  Furthermore, the LEDs may be placed away from the illumination outlet to obtain compatibility between overhead lights and luminous flux required in the operating room. Furthermore, by being spaced apart, the LEDs do not interfere with the surgeon's view, thus allowing the surgeon to take advantage of the better comfort of the overall view.

The lighting device of the present invention advantageously has the following features:
-The power supply means is adapted to change the respective currents transmitted to the LEDs on the basis of the principle of the communication container, which has the advantage that the illumination can be kept constant when changing the color temperature from the illumination outlet .

  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 to 100, preferably in the range of 90 to 100;

  The present invention is given as a non-limiting example and will be better understood and other advantages will become apparent upon reading the following detailed description of the embodiments illustrated in the accompanying drawings.

It is a perspective view of the lighting fixture which illuminates an operation area | region and contains the illuminating device of this invention. FIG. 2 is a detailed diagram of the lighting device of FIG. 1. FIG. 3 is a diagram illustrating an example of current passing through the LEDs of the illumination device of FIG. 2 to obtain various different color temperatures at the illumination outlet.

  FIG. 1 shows a luminaire 1 that illuminates a surgical area 2 for illumination, which is the area where a surgeon performs an operation on a patient.

  The lighting fixture 1 in this example is of the type suspended from the ceiling of the operating room by a conventional method, and includes two suspension arms 3 each connected by a hinge that supports the overhead lamp 4 as an example. As can be seen in FIG. 1, each lamp 4 may have a plurality of illumination outlets, such as 20 of the illumination device of the present invention.

  FIG. 2 is a high level diagram of an embodiment of the lighting device 10 of the present invention.

  In this example, the lighting device includes two light sources, and each light source includes LEDs 11a and 11b that generate white light. The two LEDs 11a and 11b are coupled to the two head bundles 15a and 15b of the optical fiber in the optical fiber harness 13, respectively. The LEDs 11a, 11b may be directly pressed against the head of the harness 13, or they may be coupled via focusing optical elements 14a, 14b such as lenses, prisms, reflectors, collimators, etc., or combinations thereof. . Upstream from the head of the harness 13, each LED 11a, 11b is preferably connected to the cooling radiators 12a, 12b, for example using thermal grease.

  The optical fibers in the two head bundles 15a, 15b are distributed to a plurality of outlet bundles or arms 18 of optical fibers which are coupled to respective illumination outlets 20 via respective focusing optical elements, for example. Cross-connected (ie mixed) within the body 16. Such optical elements may be lenses, prisms, reflectors, collimators, etc., or combinations thereof.

  Therefore, the harness 13 having two head bundles 15a and 15b and a large number of outlet bundles 18 such as 32 or 64 can be seen. It should be understood that the harness 13 may have hundreds or thousands of optical fibers. The optical fiber of the harness 13 is preferably made of glass in order to contribute to good lighting efficiency without diminishing the red length of the fiber optic harness that is of considerable length and to reduce the risk of the harness igniting. . In addition, for better efficiency of the harness 13, the optical fibers of the harness 13 are preferably fused together in the harness 13, and an optical fiber having a large acceptance angle is preferably used to reduce loss.

  The cross-connecting or mixing of the optical fibers in the harness 13 achieves a uniform distribution of the fibers, so that each outlet bundle 18 has, for example, the same number of half coming from the head bundle 15a and half coming from the head bundle 15b. It has the same proportion of optical fibers coming from each of the two head bundles 15a, 15b which are optical fibers.

  FIG. 2 starts with two head bundles 15a, 15b and is a harness that forms two groups 19a, 19b of 16 outlet bundles 18 fitted into two overhead lamps 4 or two parts of one overhead lamp 4, for example. 13 shows a cross-connection of optical fibers at 13.

  In the present invention, the LEDs 11a and 11b are supplied with power by power supply means adapted to separately transmit different currents to the LEDs 11a and 11b. The power supply means may be in the form of a single power supply or in the form of two power supplies 17a and 17b as shown in FIG.

  In the present invention, the LED 11a as the first light source generates white light having a first color temperature, and the LED 11b as the second light source generates white light having a second color temperature different from the first color temperature. . Thus, white light is obtained from the illumination outlet 20 having an intermediate color temperature that is between the first color temperature and the second color temperature, and the total luminous flux from the illumination outlet 20 is the two LEDs 11a including the loss, Equal to the sum of the respective beams from 11b (in the case of a fiber, for example in the coupling of the fiber and the focusing optical element).

  The selected white LED should have a high color rendering index in the range of 85 to 100, preferably in the range of 90 to 100, in fact in the range of 95 to 100, and a color temperature in the range of 3000K to 6700K. As an example, the LED 11a may have a color temperature of 3000K, and the LED 11b may have a color temperature of 5000K. This provides white light illumination at an intermediate color temperature of about 3900K when both LEDs 11a and 11b are each powered by the same current.

  Preferably, the LEDs 11a and 11b are selected to be geometrically identical except for their color temperature to avoid any other differences in the luminous flux between the LEDs 11a and 11b. This difference between the LEDs may be, for example, within the composition of the powder mixture of phosphorus that forms the LED. In particular, it is preferred to select LEDs that come from the same supplier, such as LEDs that have the same package, the same electronic chip and require the same type of power supply.

  The illuminating device 10 of the present invention has only white LEDs, thereby ensuring that no colored shadows occur in the surgical area 2 even if there are obstacles in the luminous flux at the exit from the illuminating device. Understood.

  The present invention relies on the fact that the luminous flux from the LED depends on the current passing through the LED. By changing the current supplied to each of the two LEDs 11a and 11b, the luminous flux from each of the LEDs 11a and 11b is changed, so that it is always adjusted over the first to second color temperature range of the LEDs 11a and 11b. It becomes possible to obtain light from the illumination outlet 20 having a possible intermediate temperature.

  In the present invention, the currents that supply power to the LEDs 11a and 11b respectively change so as to change each of the light beams from the LEDs 11a and 11b based on the principle of the communication container, in other words, to keep the total light flux constant. As a result, the intermediate color temperature from the illumination outlet 20 is changed, and the illumination of the surgical region 2 is kept constant. The term “constant” is used to mean that the luminous flux is the same as within 5%.

  The lighting device 10 of the present invention is uniform and constant by appropriately changing the currents supplied to the LEDs 11a and 11b, and is adjusted from the first color temperature of the LED 11a to the second color temperature of the LED 11b. It is understood that a white light beam having a possible color temperature is obtained at the illumination outlet 20.

  FIG. 3 is a table showing various color temperatures of illumination light from the illumination outlet 20 obtained with different currents to power the LEDs 11a and 11b in a manner that preserves that the total luminous flux at the illumination outlet 20 is constant. It is. From this table it can be seen that the appropriate current for powering the two LEDs 11a and 11b varies with the principle of the communication container, ie, in a complementary and opposite manner, with minor modifications.

  The table of FIG. 3 is obtained by measuring the light spectrum generated by the conventional method by evaluating the color temperature of the light generated by the illumination outlet 20 with the spectrometer and based on the spectrum. be able to. Thereby, the illuminating device 10 can be calibrated by specifying the power supply current transmitted to LED11a and 11b for every color temperature in the illumination exit 20. FIG.

  In FIG. 3, LEDs 11a and 11b having color temperatures of 5000K and 3000K, respectively, can be used to change the color temperature of the luminous flux at the illumination outlet 20, in this example stepped from about 3400K to about 4500K. In addition, it can be seen that LEDs 11a and 11b are powered with a current in the range of about 200 milliamps (mA) to about 900 mA.

  For example, if an LED with a color temperature of 5000 K is powered at about 200 mA and an LED with a color temperature of 3000 K is powered at about 900 mA, a color temperature of about 3400 K is obtained at the illumination outlet 20, which is It corresponds to a certain luminous flux.

  As an example, in order to obtain a color temperature of about 3800K from the illumination outlet 20 while preserving the same luminous flux from the illumination outlet 20, the current for powering the LED having a color temperature of 5000K is increased to about 450 mA, and the color temperature is It is appropriate to reduce the current supplying the 3000K LED to about 600 mA.

  As a modification, a sensor, such as a spectrometer, that measures the color temperature of the light from the illumination outlet 20 can be installed to optimize the currents that power the LEDs 11a and 11b, respectively.

  Naturally, the present invention is not limited to the above description as one of the embodiments, and various modifications can be made without exceeding the scope of the present invention.

  As mentioned above, it will be appreciated that the LEDs 11a and 11b may be remote from the overhead light 4 that illuminates the surgical area 2, and may be located, for example, outside the operating room, thereby facilitating maintenance work and hygiene. There are advantages in terms. In addition, since the overhead lamp 4 no longer has a heat source and remains cold, this has a great advantage in terms of temperature, thereby increasing the compatibility of the lamp 4 with the luminous flux used in the operating room.

  Further, the LEDs 11a and 11b and the harness 13 of the lighting device 10 of the present invention may be disposed in the overhead lamp 4 as a whole, and thus the harness can be prevented from passing along the suspension arm 3.

  Depending on the LED power available on the market and the desired illumination power, one or more LEDs can be attached to each illumination source. If very powerful LEDs are used (e.g. 13 watts (W) or 41 W), the size of the electronic card can be reduced, thus providing economic and environmental advantages.

  Without exceeding the scope of the present invention, the harness 13 may include a number of head bundles 15a, 15b, preferably a multiple of 2, each head bundle having one LED. Furthermore, all head bundles 15 a, 15 b can be advantageously connected within a single body 16 of the harness 13.

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

Claims (4)

A surgical lighting device (10) using an LED,
A first LED (11a) adapted to generate white light having a first color temperature;
A second LED (11b) adapted to generate white light having a second color temperature different from the first color temperature;
Power supply means (17a, 17b) adapted to supply different currents to the LEDs (11a, 11b),
The first and second LEDs are coupled to a plurality of illumination outlets (20) of the lighting device by an optical fiber harness having two head bundles (15a, 15b) of optical fibers and a plurality of outlet bundles (18) of optical fibers. The two optical fiber head bundles (15a, 15b) are coupled to the first and second LEDs (11a, 11b), respectively, and the outlet bundle is coupled to the illumination outlet, respectively. The optical fibers are evenly cross-connected in the harness so that each outlet bundle (18) has the same proportion of optical fibers coming from each of the head bundles, so that each illumination outlet (20) is connected to the LED ( 11a, 11b) can be adjusted over a range from the first color temperature to the second color temperature by changing the respective currents supplied with power. Characterized in that a suitably to produce white light with a surgical lamp.   The lighting device (10) according to claim 1, wherein the power supply means (17a, 17b) is adapted to change respective currents transmitted to the LEDs (11a, 11b) based on the principle of a communication container.   Lighting device (10) according to claim 1 or 2, wherein each LED (11a, 11b) has a color temperature in the range of 3000K to 6700K.   4. A lighting device according to claim 3, wherein each LED (11a, 11b) has a color rendering index in the range of 85 to 100, preferably in the range of 90 to 100.

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