DE102011017733A1 - Operating room lamp has reflection surface, which is designed, such that light of light medium is reflectable in visible spectral region in selected range of angles to main reflector - Google Patents

Abstract

The operating room lamp (1) has a main reflector (2), where a lamp carrier (3) is aligned concentric to an optical axis (A) of the lamp. A light medium is arranged in a light entry opening, where a light exit opening is arranged inclined with respect to the optical axis. A reflection surface is designed, such that a light of the light medium is reflectable in the visible spectral region in a selected range of angles to the main reflector.

Description

The invention relates to an operating room light with a main reflector, a light source carrier aligned concentrically to the optical axis A of the surgical light, at least one illuminant arranged inclined on the lateral surface of the illuminant carrier with respect to the optical axis A and in operative connection with the light source arranged primary reflector with a light inlet opening, a reflection surface and a light exit opening.

Such a surgical light provides for a surgical room of a hospital a focusable light cone with a particularly high luminance in focus. The bulbs include LED bulbs (LED, OLED or laser diode). As an advantage over surgical lights with conventional bulbs such as halogen and discharge lamps radiate the aforementioned bulbs to produce a white light significantly less infrared light and thus heat.

The main reflector is preferably arranged in a luminaire housing and has a lower light exit opening in the operating position. The optical axis A is perpendicular to the light exit opening and is arranged centrally to the main reflector. For total focusing of the light cone of the surgical light, the illuminant carrier comprises a first means with which the vertical distance of the illuminant carrier and thus also of the illuminant and the primary reflector with respect to the main reflector is adjustable.

Out DE 10 2007 042 646 A1 are already surgical lights with circumferentially arranged on the LED carrier LED rows known, designed as a ring reflector primary reflector is arranged concentrically to the optical axis below the illuminant carrier.

Furthermore, surgical lights are still off DE 10 2007 048 115 A1 with a flat, designed as a swivel plate illuminant carrier, wherein the optical axis of the arranged bulbs runs substantially parallel to the optical axis of the surgical light. There is also a portable medical head lamp with LEDs GB 2 404 972 A known.

A disadvantage of the prior art is that a large number of such lamps must be used for surgical lights with the described light sources (LED, OLED and laser diode) in order to realize sufficiently homogeneous and shadow-free illumination for the operating surface. The large number of bulbs requires high production costs and places high demands on the thermal management of the surgical light, because the heat generated by the bulbs must be dissipated upward, ie away from the surgical area.

It is the object of the invention to avoid the disadvantages of the prior art mentioned at least in part and in particular to provide an operating light which realizes a sufficiently large homogeneous shadow-free illumination for the surgical area and which is comparatively inexpensive to produce.

The object is achieved according to the invention already in that a light source is arranged in the light inlet opening of a primary reflector, that the light exit opening is aligned substantially inclined to the optical axis A, that the reflection surface is formed such that almost exclusively incident on the reflection surface of the light Illuminant in the visible spectral range in a selected angular range to the main reflector is reflected.

The angle of inclination of the luminous means and the light exit opening of the primary reflector is preferably determined for optimal illumination of the main reflector. This can preferably be formed substantially perpendicular to the optical axis of the surgical light. The angle of inclination may also be between 10 ° and 90 °.

By the primary reflector, a very good light output is realized and a color change of the light is avoided. Compared to collimator lenses, the luminous efficacy is almost lossless. Furthermore, no color edges occur in reflectors. The use of reflectors and collimator lenses in optical systems is known.

In order to take into account the known drop in intensity in the edge region of the described bulbs, especially in LEDs, the angular ranges of the reflection of the primary reflector to the main reflector are preferably selected such that the emitted light cone of several bulbs overlap at least partially when hitting the main reflector. Preferably, the angular range may coincide with the respective designated angular range of the illuminant at 50% intensity. The formula for calculating the angle range is:
360 ° / number of lamps + overlap area, preferably 15 °. This corresponds to half the beam angle at which the light intensity of the bulb has dropped to 50%. With 8 bulbs, the angular range is therefore 75 °.

To take account of different operating situations or bulbs, the production of the primary reflector in modular design be realized. It can be provided for this purpose that the reflection surface is formed in several parts of concentric rings and that the rings of the reflection surface are arranged radially circumferentially around a respective lighting means.

Particularly uniform light cones are achieved when the reflector surface is formed such that incident light is directed almost completely to the main reflector. For this purpose, the reflector surface z. B. may be formed in total as a rotationally symmetrical annular half-shell. Furthermore, the reflector surface may have a parabolic and / or elliptical contour in cross section. As described, the reflector surface may be formed of concentric rings. These rings can have a contour that merges steadily into the contour of the respective adjacent ring.

In the sense of the described modular construction of the primary reflector, the rings can each also have an individual contour which as a whole does not run continuously to the contour of the respectively adjacent ring.

So that different operating situations or lighting means can be taken into account, the reflector surface can have differently colored annular reflection zones. These reflection zones may be formed as the described rings. For color adjustment of the radiated light of the surgical light, these rings may be formed in different colors. Furthermore, a color adjustment can also be done in a known manner by switching of different colored bulbs or by electronic control of color-tunable bulbs.

Furthermore, a second means may be formed between the illuminant carrier and the primary reflector, so that an axial distance between the primary reflector and illuminant is adjustable. As a result, different operating situations or light sources can also be taken into account. This second means may, for. B. include a thread or a piezoelectric adjustment. Further, this second means may include, for example, an eccentric, a miniature motor, an engine / transmission assembly including a camshaft or a piezoelectric element.

Although the lamps used emit relatively little heat, a high temperature of about 120 ° C is generated in the light generation in a semiconductor junction layer. In order to dissipate this heat, the illuminant carrier must comprise a heat-conducting agent, which rests against the illuminant. The heat is preferably dissipated in the direction of the upper-side lamp housing. This heat conducting means may be formed of the elements silver, copper or aluminum. The agent may also comprise composite materials and be designed as a "heat pipe". Furthermore, the means may also comprise liquid cooling or Peltier cooling.

Thus, in an adjustment of the surgical light for different operating situations, a simple handling for the OR staff can be realized, the light source is preferably designed such that a simple replacement of the illuminant carrier and thus the arranged light source and the primary reflector is possible. For this purpose, the illuminant carrier may comprise, for example, a thread, a latching closure and / or a bayonet closure.

The invention will now be described with reference to a preferred embodiment, reference being made to the accompanying drawings. In these show:

1 a side view in section of the embodiment of the surgical light according to the invention and

2 an enlarged section of the surgical light according to 1 ,

Accordingly, the surgical light according to the invention comprises 1 a main reflector 2 which is arranged in a luminaire housing and which has a lower light exit opening in the operating position. The optical axis A is perpendicular to the light exit opening and is also arranged centrally or concentrically to the main reflector. The surgical light according to the invention 1 also includes a concentric with the optical axis A of the surgical light aligned illuminant carrier 3 and two annular rows of eight each on the lateral surface of the illuminant carrier 3 with respect to the optical axis A inclined arranged bulbs 4 , The bulbs 4 a row have a uniform distance from each other. The rows are arranged offset from one another in such a way that in a plan view, not shown, of the illuminant carrier, the total 16 Lamp 4 are also equally spaced. In operative connection with one illuminant each 4 is a primary reflector 5 with a light entrance opening, a reflection surface 6 and a light exit opening arranged.

One light bulb each 4 is in the light entrance opening of a primary reflector 5 arranged. The light exit opening of the primary reflector and the primary reflector 5 themselves are substantially inclined to the optical axis A on the illuminant carrier 3 arranged.

The angle of inclination of the luminous means and of the light exit opening of the primary reflector is intended for optimum illumination of the main reflector and, as illustrated, formed substantially perpendicular to the optical axis A of the surgical light.

For overall focusing of the light cone of the surgical light 1 includes the illuminant carrier 3 a first remedy 7 , with which the vertical distance of the illuminant carrier 3 and thus also the bulb 4 and the primary reflector 6 in relation to the main reflector 2 is adjustable. The first means 7 is designed as a thread.

The reflection surface is designed such that almost exclusively on the reflection surface 6 incident light of the bulb 4 in the visible spectral range in a selected angular range to the main reflector 2 is reflective. The selected angle range here is 75 °.

Between the illuminant carrier 3 and the primary reflector 5 is a second means 8th formed, whereby an axial distance between the primary reflector 5 and the bulb 4 is adjustable. The second means 8th is designed as a thread.

Lamp support 3 is made of copper and directs the light from the bulb 4 emitted heat in the direction of the upper-side lamp housing.

LIST OF REFERENCE NUMBERS

A

optical axis

1

Surgical Light

2

main reflector

3

Lamp support

4

Lamp

5

primary reflector

6

reflector surface

7

first means

8th

second means

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007042646 A1 [0004]
• DE 102007048115 A1 [0005]
• GB 2404972 A [0005]

Claims (9)

Surgical light ( 1 ) with a main reflector ( 2 ), concentric to the optical axis (A) of the surgical light ( 1 ) aligned illuminant carrier ( 3 ), at least one on the lateral surface of the illuminant carrier ( 3 ) and in relation to the optical axis (A) inclined arranged bulbs ( 4 ) and in operative connection with the illuminant ( 4 ) arranged primary reflector ( 5 ) with a light entry opening, a reflection surface ( 6 ) and a light exit opening, wherein the illuminant carrier ( 3 ) a first means ( 7 ), so that a vertical distance of the illuminant carrier ( 3 ) and thus also of the illuminant ( 4 ) and the primary reflector ( 5 ) with respect to the main reflector ( 2 ) is adjustable, characterized in that in each case a lighting means ( 4 ) is arranged in the light inlet opening, that the light exit opening is arranged inclined with respect to the optical axis (A) that the reflection surface ( 6 ) is formed such that almost exclusively on the reflection surface ( 6 ) incident light of the bulb ( 4 ) in the visible spectral range in a selected angular range to the main reflector ( 2 ) is reflectable. Surgical light ( 1 ) according to claim 1, characterized in that the reflection surface ( 6 ) is formed of multi-part concentric rings and that the rings of the reflection surface ( 6 ) radially circumferentially around a respective lighting means ( 4 ) are arranged. Surgical light ( 1 ) according to one of the preceding claims, characterized in that on the reflector surface ( 6 ) incident light is directed almost completely to the main reflector. Surgical light ( 1 ) according to one of the preceding claims, characterized in that the reflector surface ( 6 ) has different colored reflection zones. Surgical light ( 1 ) according to one of the preceding claims, characterized in that between the illuminant carrier ( 3 ) and the primary reflector a second means ( 8th ) is formed, so that an axial distance between the primary reflector and lighting means is adjustable. Surgical light ( 1 ) according to claim 5, characterized in that the second means ( 8th ) comprises a thread or a piezoelectric adjustment. Surgical light ( 1 ) according to claim 1, characterized in that the first means ( 7 ) comprises a thread. Surgical light ( 1 ) according to one of the preceding claims, characterized in that the illuminant carrier ( 3 ) comprises a heat conducting means, which on the light source ( 4 ) is present. Surgical light ( 1 ) according to one of the preceding claims, characterized in that the illuminant carrier ( 4 ) is designed such that a simple replacement of the illuminant carrier ( 3 ) and thus the arranged light source ( 4 ) and the primary reflector ( 5 ) is possible.

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