CN112664909B

CN112664909B - Facula adjusting part, lighting device and operating lamp

Info

Publication number: CN112664909B
Application number: CN202011573608.5A
Authority: CN
Inventors: 王磊
Original assignee: Nanjing Mindray Bio Medical Electronics Co Ltd
Current assignee: Nanjing Mindray Bio Medical Electronics Co Ltd
Priority date: 2017-03-15
Filing date: 2017-03-15
Publication date: 2023-05-30
Anticipated expiration: 2037-03-15
Also published as: CN109073206A; ES2926223T3; EP3597993A4; WO2018165880A1; EP3597993B1; CN109073206B; EP3597993A1; CN112664909A

Abstract

The light spot adjusting assembly consists of two layers of light-transmitting structures, wherein the two layers of light-transmitting structures are provided with air gaps, light emitted by a light source passes through the air gaps in the light spot adjusting assembly, the shape of the two layers of light-transmitting structures is adjusted, the shape of the air gaps can be changed, the divergence angle of the light beam is increased when the light passes through the air gaps, the deflection angle of the light beam reaching a preset area is changed, and the size of a light beam converging light spot is changed by changing the deflection angle of the light beam under the condition that the distance between a light emitting device and the preset area of the light spot is unchanged. The application also discloses a light-emitting device and an operating lamp.

Description

Facula adjusting part, lighting device and operating lamp

The present application is a divisional application, the application number of the original application is 201780024468.6, the application date is 15 days of 3 months in 2017, and the name of the present application is a light-emitting device and an operating lamp.

Technical Field

The invention relates to the field of illumination, in particular to a light spot adjusting assembly, a light emitting device and an operating lamp adopting the light emitting device.

Background

The operating lamp is used as a special lamp for an operating room, and besides meeting the brightness requirement, the operating lamp is required to achieve a shadowless effect. Therefore, the operating lamp is generally large in size, the lamp cap can reach 600-700mm in size, and multiple beams of light are converged into a desired light spot so as to illuminate an operating field.

The common operating lamp generally adopts a technical scheme of a star, in the scheme, an LED light source is arranged in a reflector or a lens to form an independent lighting unit, a plurality of lighting units are distributed in a lamp cap, the irradiation directions of the lighting units point to an operating area, and finally, a surface light source with a certain direction and converging light rays is formed to realize the shadowless effect. In this scheme, when the size of the light spot formed by the operating lamp in the operating area is adjusted, a method of changing the light intensity distribution in the operating area by changing the irradiation angle of the illumination unit or a method of changing the light intensity distribution in the operating area by changing the relative intensities of the light output by the illumination units irradiated at different positions in the operating area is generally used.

In another variation of the starry approach, the plurality of illumination units comprising the LED light sources and the lenses are distributed around the lamp cap, a large reflector is placed in the middle of the inside of the lamp cap, and the light rays emitted by the illumination units directly or indirectly irradiate the center of the lamp cap and irradiate the reflector, and the reflector reflects the light rays to the operation area. In the scheme, the method for changing the spot size of the operation area is to use two (or more) groups of illumination units, wherein the positions and the illumination angles of the groups of illumination units in the lamp cap are different, so that the directions of light rays after the light rays are reflected by the reflecting cover are also different, different light intensity distribution is formed in the operation area, and the light intensity distribution of the operation area is changed by changing the relative intensities output by the two groups of illumination units.

The above proposal needs a plurality of lighting units, which increases the weight of the lamp cap, the material cost and the installation time because of the large number of the lighting units, and has higher requirements on the positioning and the installation structure because of higher requirements on the irradiation angle of the lighting units.

Disclosure of Invention

The invention mainly solves the technical problem of providing a light spot adjusting scheme different from the prior art, and the light spot can be adjusted without adjusting the positions and angles of a plurality of lighting units.

According to a first aspect, there is provided in one embodiment a spot-adjusting assembly comprising:

the light emitting device comprises a first columnar cylinder, a second columnar cylinder and a first lens, wherein the inner surface of the first columnar cylinder is a light incident surface, the outer surface of the first columnar cylinder is a light emitting surface, and the light emitting surface of the first columnar cylinder is provided with a first concave-convex surface structure;

the second cylindrical barrel, the internal surface of second light transmission structure is the light incident surface, and the surface is the light emergent surface, have the unsmooth face structure of second on the light incident surface of second cylindrical barrel, first cylindrical barrel nestification is inside second cylindrical barrel, makes first unsmooth face structure and second unsmooth face structure are facing to set up and have air gap between the two, second cylindrical barrel and first cylindrical barrel can relatively move, in order to change the shape of air gap, thereby change the facula size that gathers at predetermined region.

According to a second aspect, there is provided in one embodiment a light emitting device comprising:

a light source for emitting light;

the reflector comprises a top end, a bottom end with an annular opening and a reflector extending from the top end to the bottom end, so that light projected to the inner side of the reflector is reflected and converged into a light spot with a preset size in a preset area;

the light spot adjusting assembly surrounds the light path between the light source and the reflector and is used for adjusting the light incident on the reflector so as to change the size of the light spot converged in the preset area after the light is reflected by the reflector.

In the above embodiment, the light spot adjusting assembly is composed of an inner layer of light transmitting structure and an outer layer of light transmitting structure, the two layers of light transmitting structures are provided with air gaps, light emitted by the light source passes through the air gaps in the light spot adjusting assembly, the shape of the air gaps can be changed, the divergence angle of the light when the light is transmitted through the air gaps is increased, the light is more diverged when irradiated to the reflecting cover, the deflection angle of the light beam reaching the preset area is changed, and the size of the light beam converging light spot is changed by changing the deflection angle of the light beam under the condition that the height of the light emitting device from the preset area presenting the light spot is unchanged.

According to a third aspect, there may also be provided in an embodiment a light emitting device comprising:

a plurality of light sources for emitting light, at least one light source comprising a first light source emitting light of a first color temperature and a second light source emitting light of a second color temperature;

the light deflection element is positioned between the light source and the reflector, is used for collecting forward light and lateral light emitted by the light source, and adjusts the light propagation direction so that the light emitted from the light deflection element is projected to the inner side of the reflector;

the reflector comprises a top end, a bottom end with an annular opening and a reflector extending from the top end to the bottom end, so that light projected to the inner side of the reflector is reflected and converged into a light spot with a preset size in a preset area.

In this embodiment, two monochromatic light sources with different color temperatures are closely combined together to form a point light source, and after the mixed light with two color temperatures emitted by the point light source is reflected by the reflecting cover, a light spot with more uniform mixing can be obtained.

According to a fourth aspect, there is also provided an operating lamp comprising a lamp cap made of the above-described light emitting device.

Drawings

FIG. 1 is a cross-sectional view of an operating lamp in an axial direction;

FIGS. 2A-2H are schematic diagrams illustrating various embodiments of a light source;

FIGS. 3A-3C are schematic diagrams of various embodiments of light deflecting elements;

FIG. 4 is a schematic view of a structure of a broken-line reflector according to an embodiment;

FIG. 5 is a schematic view of a reflector according to another embodiment;

FIG. 6 is a schematic diagram of adjusting a spot by changing a light source in one embodiment;

FIG. 7 is a schematic diagram of a light emitting device in one embodiment for adjusting a spot by a spot adjusting assembly;

8A-8F are schematic diagrams of spot adjustment processes for the embodiment of FIG. 7;

FIG. 9 is a schematic diagram of a light emitting device in another embodiment for spot adjustment by a spot adjustment assembly;

FIG. 10 is a schematic diagram of a light emitting device in yet another embodiment for spot adjustment by a spot adjustment assembly;

fig. 11 is a schematic structural view of a light emitting device with an added filter.

Detailed Description

The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

The light-emitting device disclosed in the embodiment of the invention does not adopt a starlike scheme consisting of a plurality of small-sized lighting units, but one or more light sources share a set of optical system, and the optical system collects light emitted by the light sources and then converges the light into a desired light spot after reflection. The following description will be made by taking an example in which the light emitting device is applied to an operating lamp.

Referring to fig. 1, fig. 1 is a sectional view of an operation lamp in an axial direction, the operation lamp including a lamp cap, the lamp cap further including a light emitting device 100, a lamp cap rear cover 200, and a lamp cap front cover 300, the light emitting device 100 being mounted on the lamp cap rear cover 200, the lamp cap rear cover 200 and the lamp cap front cover 300 enclosing a receiving chamber, and the light emitting device 100 being enclosed in the receiving chamber. The light emitting device 100 comprises a light source 1, a light deflecting element 2 and a reflector 3, the reflector 3 comprising a top end 301, a bottom end 302 and a reflector 303, the reflector gradually expanding from the top end to the bottom end, the bottom end having an annular opening, the top end also having a smaller annular opening, the annular opening being circular in shape or elliptical or polygonal in shape. In other embodiments, the tip may also take the form of a closure, such as a tip or a platform. The reflector 3 is umbrella-shaped and fixed on the lamp cap rear cover. The light source 1 is located in the top area of the reflector, the light emergent surface faces the bottom end of the reflector, the light source 1 is preferably arranged on a circuit board (not shown in the figure), the circuit board is fixed on the lamp cap rear cover, and the circuit board is equivalent to the position, close to the central top of the operating lamp, of the light source 1, so that heat generated by the light source can be quickly conducted to the lamp cap rear cover through a large-area heat conduction path. The light deflecting element 2 is located between the light source 1 and the reflector 3, the light deflecting element 2 being mounted on the burner rear cover or on the top end of the reflector 3 or on the circuit board.

The following describes each part of the light emitting device and the light processing concept thereof.

In this embodiment, the light source 1 employs a forward light source, and the forward light source is characterized in that light is emitted substantially in the range of 0-180 degrees, so that the light emitted from the light source 1 includes forward light and side light. In other embodiments, the light source 1 may be a light source that emits light around. As defined herein, the angle between the light beam and the optical axis is referred to as a divergence angle, and then forward light refers to a light beam having a divergence angle of less than or equal to a certain value, and side light refers to a light beam having a divergence angle of greater than or equal to a certain value and less than a maximum divergence, for example, for a light source emitting light in a range of 180 degrees, a light beam having a divergence angle of less than or equal to 40 degrees, 45 degrees, or 50 degrees is referred to as forward light, and a light beam having a divergence angle of greater than or equal to 40 degrees, 45 degrees, or 50 degrees and less than 90 degrees is referred to as side light. For a light source that emits light in the 90 degree range, a light beam having a divergence angle of less than or equal to 30 degrees or 35 degrees is referred to as forward light, and correspondingly, a light beam having a divergence angle of more than 30 degrees or 35 degrees and less than 45 degrees is referred to as side light. It can be seen that the divergence angle of the lateral light is greater than the divergence angle of the forward light, whichever source is.

In this embodiment, the light source 1 may be one light source or a combination of a plurality of light sources, and the types of the light sources include, but are not limited to, LEDs, OLEDs, lasers, optical fibers, optical fiber bundles, fluorescent powder, light pipes, etc., and the optical fibers, optical fiber bundles, light pipes, etc. may be collectively referred to herein as a light guide, for introducing the light emitted from the light source outside the lamp cap into the light source position of the light emitting device, and for use as the light source in the light emitting device. When the light source 1 adopts a plurality of light source combinations, parameters such as spatial distribution characteristics, spectral characteristics, intensity characteristics and the like of the whole light source can be changed by utilizing different types of light source combinations so as to meet different clinical requirements. When a plurality of light sources are used for combination, the mixing degree of different light sources after being reflected can be changed by controlling the size of the light emitting area of the light sources and the parameters of the reflecting cover, so that uniform light mixing is realized. For example, as shown in fig. 2, in fig. 2A, one LED light source 101 is used as the light source 1; fig. 2B uses two light sources, namely a high color temperature LED102 and a low color temperature LED103, to combine into a light source 1, and the color temperature adjusting function of the operation lamp is realized by adjusting the relative brightness of the two light sources; because the two different color temperature LEDs 102 and the LED103 are combined in one light source 1, the distance between the LED102 and the LED103 is very close, compared with the reflector 3 which is far larger than the light source 1 in size, the combined light source 1 can be regarded as a point light source, the light emitted by the point light source is the mixed light of the two different color temperature LEDs 102 and the LED103, and the mixed light is reflected by the reflector 3 to obtain more uniform mixed light, so that when the brightness of one of the LEDs is regulated, the color temperature of the light source can be changed, and the light spot obtained in a preset area can be more uniform. In fig. 2C, an OLED surface light source 104 is used as the light source 1; the light of the light source 106 outside the operatory lamp cap is introduced into the operatory lamp cap at the light source location using an optical fiber or bundle of optical fibers or a light guide 105 in fig. 2D to form the light source 1; the divergence angle of the light rays emitted from the optical fiber (bundle) is further expanded by using the lens 107 in fig. 2E in combination with the optical fiber (bundle) 108 to form the light source 1; in fig. 2F, the emitted light from the head end of the optical fiber (bundle) further excites the fluorescent powder 109 to form the light source 1, so that the wavelength conversion of light can be realized; in fig. 2G, different phosphors or optical fibers (bundles) of the light source are used to form the light source 1, for example, a high color temperature phosphor and a low color temperature phosphor are used to realize the color temperature adjusting function; fig. 2H is an example of a combination of different types of light sources.

For the light source with light distribution in the range of 0 to 180 degrees, how to collect and utilize light as much as possible is important, under the condition that the light deflection element 2 is not used, part, most or all of the lateral light emitted by the light source 1 can be irradiated to the inner side of the reflector due to the large divergence angle, but the forward light emitted by the light source 1 is limited by the longitudinal dimension due to the small divergence angle, and the size of the reflector cannot be made in the longitudinal direction is too large, so that the forward light cannot be irradiated to the inner side of the reflector, and the light emitted by the light source cannot be fully utilized. If the reflector is considered to be arranged on the light path of the forward light to collect the forward light, the lateral light cannot be collected due to the design constraint of the reflector in space of the operating lamp. For this reason, one light deflecting element 2 is employed in the embodiment of the present invention to collect light rays in the range of 0 ° to 180 ° (i.e., the range of divergence angle 0 ° or more and less than 90 °). The light deflection element 2 is located between the light source 1 and the reflector 3, and is specifically located on the light paths of the forward light and the lateral light, and is used for collecting the forward light and the lateral light, and adjusting the deflection directions of the forward light and the lateral light, so that the forward light and the lateral light emitted after adjustment can be projected to the inner side of the reflector. In a specific embodiment, the light deflecting element 2 may adjust the light propagation directions of the forward light and the side light by one or more of refraction, reflection and total reflection, so that the forward light and the side light emitted from the light deflecting element propagate in a direction projecting toward the reflector. In some embodiments, the light propagation directions of the forward light and the side light exiting from the light deflecting element are adjusted to be close to or uniform, as shown in fig. 3. In order to compress the thickness of the reflector in the longitudinal direction as much as possible, a smaller deflection of the lateral light and a larger deflection of the forward light can be performed.

In order to make full use of the lateral light emitted by the light source, the light deflecting element 2 reflects the lateral light at most twice and/or totally reflects it, i.e. the total number of times the light deflecting element 2 reflects the lateral light and/or totally reflects it at most twice. After the light is reflected, the energy of the light is lost, and cascade loss is caused by repeated reflection, so that the light energy cannot be effectively utilized. The reflection or total reflection of the light is limited by factors such as the manufacturing process and assembly of the optical element, the reflected or total reflection light has a certain angle deviation from the theoretical reflection angle, the reflection angle deviation can influence the size or positioning of the light spots formed by the convergence of the reflecting cover, and the reflection angle deviation can be further amplified by multiple reflection or total reflection. For the above reasons, the light deflecting element 2 of the present application is at most reflective twice and/or totally reflective for lateral light.

To enhance the rational utilization of the forward light, the total number of reflections and/or total reflections of the forward light may also be set to at most two times for the reasons described above.

The specific structure of the light deflecting element 2 is illustrated in fig. 3A to 3C, and the light deflecting element 2 of these examples may be symmetrical about its center, the light source 1 emits light within a range of 180 °, directions shown as 90 ° are optical axes (i.e., centers), and 0 ° and 180 ° are edges.

In the embodiment shown in fig. 3A, the light deflecting element 2 collects side light near the edge by refraction (e.g., rays having a divergence angle between 60 degrees and 90 degrees, 60 ° < divergence angle <90 °), and collects forward light near the center by total reflection (e.g., rays having a divergence angle between 0 degrees and 60 degrees, 0 ° -60 °). The light deflecting element 2 includes a refractive portion 201 and a total reflection portion 202, the refractive portion 201 and the total reflection portion 202 being transparent media, the refractive portion 201 being disposed on an optical path of the lateral light for collecting the lateral light, and the total reflection portion 202 being disposed on an optical path of the forward light for collecting the forward light. Fig. 3A is a cross-sectional view of the light deflection element 2 along the central axis, and the solid body of the light deflection element 2 is formed by rotating the figure shown in fig. 3A around the central axis. The refraction portion 201 is bowl-shaped, the bowl mouth is upwards fixed at the lamp holder rear portion, and the refraction portion 201 includes surface 2011 and internal surface 2012, and the internal surface 2012 encloses into a square groove, and the upper surface opening forms the bowl mouth, and light source 1 sets up in the bowl mouth region of refraction portion 201. The lateral light emitted from the light source 1 enters the inner surface 2012, and exits from the outer surface 2011 after being refracted. The outer surface 2011 is convex and for ease of description, this convex is referred to as the first convex. The curvature of the first convex surface 2011 varies with the divergence angle of the lateral light such that the direction of light propagation approaches or coincides after the lateral light is refracted by the first convex surface. The total reflection portion 202 is located below the refraction portion 201, specifically, on the optical path of the forward light. The total reflection portion 202 includes a light incident surface 2021, a total reflection surface 2022, and a light exit surface 2023, and the incident surface 2021 and the light exit surface 2023 may be flat surfaces, and the total reflection surface 2022 is a convex surface, referred to herein as a second convex surface, which extends obliquely downward from a central axis. The forward light emitted from the light source 1 is incident from the incident surface 2021 and irradiates the second convex surface 2022, the curvature of the second convex surface 2022 changes with the divergence angle of the forward light, so that the incident angle of the forward light on the inner side surface of the second convex surface is greater than or equal to the critical angle, and therefore the forward light is totally reflected on the second convex surface 2022, and the propagation direction of the forward light reflected by the second convex surface is close to or consistent, and the totally reflected forward light is emitted from the light emitting surface 2023. In the embodiment shown in fig. 3A, after the lateral light and the forward light pass through the light deflecting element 2, the propagation directions of the respective light rays are substantially parallel, and the light rays are irradiated to the reflector 3 in the horizontal direction.

In a preferred embodiment, the refraction portion 201 and the total reflection portion 202 of the light deflection element 2 may be integrated together, and integrally formed using a mold at the time of manufacturing.

In the embodiment shown in fig. 3B, the light deflecting element 2 collects light rays of all angles by total reflection twice. The light deflecting element is a transparent medium and comprises a third convex surface 203, a fourth convex surface 204 and a light emergent surface 205, the third convex surface 203 and the fourth convex surface 204 face each other, the third convex surface 203 extends obliquely downwards from the plane of the light source and is positioned on the light path of the lateral light and is used for collecting the lateral light, and the curvature of the third convex surface 203 changes along with the incident angle of the lateral light, so that the lateral light is totally reflected on the inner side surface of the third convex surface 203 and is reflected to the inner side of the fourth convex surface 204. The fourth convex surface 204 extends obliquely downward from the central axis and is located on the optical path of the forward light and is used for collecting the total reflected light of the forward light and the lateral light, and the curvature of the fourth convex surface changes along with the incidence angle of the total reflected light of the forward light and the lateral light, so that the incidence angle of the total reflected light of the forward light and the lateral light on the inner side surface of the fourth convex surface is greater than or equal to a critical angle, and the propagation directions of the total reflected light of the forward light and the lateral light are close to or consistent after the total reflected light of the forward light and the lateral light is reflected by the fourth convex surface. Fig. 3B is a cross-sectional view of the light deflecting element 2 along the central axis, the light exit surface 205 is a plane connecting the edges of the third convex surface 203 and the fourth convex surface 204, and the solid body of the light deflecting element 2 is formed by rotating the figure shown in fig. 3B around the central axis. In the embodiment shown in fig. 3B, after the lateral light and the forward light pass through the light deflecting element 2, the propagation directions of the respective light rays are substantially parallel, and the light rays are irradiated to the reflector 3 in the horizontal direction.

In the embodiment shown in fig. 3C, the light deflecting element 2 refracts the collection edge light by one individual element and collects the light near the center by reflection by another element. The deflecting element 2 includes a refractive portion 206 and a reflective portion 207. The refraction portion 206 is a transparent medium, the refraction portion 206 is disposed on an optical path of the lateral light for collecting the lateral light, and the refraction portion 206 is composed of a light incident surface 2061, a fifth convex surface 2062 as a light exit surface, and a top surface 2063. The top surface 2063 is fixed to the rear of the lamp base, the light incident surface 2061 may be made flat, and the curvature of the fifth convex surface 2062 may be changed according to the divergence angle of the lateral light, so that the propagation direction of the lateral light after being refracted by the fifth convex surface is close to or uniform. The reflecting portion 207 is a concave mirror located below the refracting portion 206, and the concave mirror extends obliquely downward from the central axis and is symmetrical with respect to the central axis. Fig. 3C is a cross-sectional view of the light deflection element 2 along the central axis, and the entity of the light deflection element 2 is rotated about the central axis from the figure shown in fig. 3C. In the embodiment shown in fig. 3C, after the lateral light and the forward light pass through the light deflecting element 2, the propagation directions of the respective light rays are substantially parallel, and the light rays are irradiated to the reflector 3 in the horizontal direction. In actual manufacturing, the refraction portion 206 and the reflection portion 207 may be separate elements, the refraction portion 206 is fixed to the rear portion of the base, and the reflection portion 207 may be fixed to a support frame, which is fixed inside the base.

The above-described fig. 3A-3C are only exemplary embodiments of the light deflecting element 2. The light deflecting element 2 of other shapes may be designed to adjust the light propagation directions of the lateral light and the forward light based on the transmission (particularly refraction), reflection or total reflection processing manner of the light deflecting element 2 for the lateral light and the forward light.

In one embodiment, an optical element may be added to the light deflecting element 2 of fig. 3A, and the optical element is located on the optical path between the light deflecting element 2 and the reflector. The optical element is used for further shaping the lateral light and the forward light, which are adjusted via the light deflecting element 2, for example, further refraction may be performed such that the light propagation directions of the lateral light and the forward light are close to or coincide.

In one embodiment, the light deflecting element 2 includes a refractive portion made of a transparent material and including a first curved surface located on an optical path of the lateral light, a curvature of the first curved surface varying with a divergence angle of the lateral light. The first curved surface refracts the lateral light projected thereon, and the refracted lateral light exits from the light deflection element to the reflector of the reflector.

In one embodiment, the light deflecting element 2 includes a first non-transmissive portion, which means that incident light does not penetrate out, but does not limit whether or not it is transparent itself. For example, the first non-transmissive portion may be a total reflection portion made of a transparent material, or a non-transparent reflection portion coated with a reflective coating. The first non-transmissive portion includes a second curved surface located on the optical path of the lateral light, the curvature of the second curved surface varying with the incident angle of the lateral light. When the first non-transmission part is a total reflection part, the second curved surface totally reflects the lateral light projected on the first curved surface, and the lateral light after total reflection is emitted to the reflector of the reflector from the light deflection element. When the first non-transmission part is a reflection part, the second curved surface reflects the lateral light projected on the first curved surface, and the reflected lateral light is emitted to the reflector of the reflector from the light deflection element.

In one embodiment, the light deflecting element 2 may further include a second non-transmissive portion, which may be a total reflection portion made of a transparent material, or a non-transparent reflection portion coated with a reflective coating, similar to the first non-transmissive portion. The second non-transmissive portion includes a third curved surface located on the optical path of the lateral light, the curvature of the third curved surface varying with the incident angle of the lateral light. When the second non-transmission part is a total reflection part, the third curved surface totally reflects the lateral light projected on the third curved surface, the lateral light after the total reflection is projected on the first non-transmission part, and the first non-transmission part totally reflects the total reflection light of the lateral light for the second time; in this case, the side light which is projected onto the reflector is reflected twice. When the second non-transmission part is a reflection part, the third curved surface reflects the lateral light projected on the third curved surface, the reflected lateral light is projected on the first non-transmission part, and the first non-transmission part secondarily reflects the reflected light of the lateral light; in this case, the reflected side light impinges on the reflector.

In the above-described embodiments, the light deflecting element 2 is capable of adjusting the light propagation direction of the side light to be projected onto the reflector after refracting, reflecting and/or totally reflecting the side light, for example, for a light source arranged on the optical axis, the light propagation direction of the side light may be adjusted to be projected to different positions on the reflector approximately in parallel. In the above embodiments, the first curved surface may be, for example, the first convex surface or the fourth convex surface in fig. 3A-3C, the second curved surface may be, for example, the third convex surface of the total reflection type in fig. 3A-3C, the fourth convex surface of the total reflection type, or the reflective concave mirror, and the third curved surface may be, for example, the second convex surface of the total reflection type in fig. 3A-3C or the composite curved surface; or the first curved surface, the second curved surface and the third curved surface can be compound curved surfaces matched with the concave-convex surfaces.

In one embodiment, as shown in fig. 1, the reflector 3 may be formed of a mirror using a reflection principle, and the light irradiated on the mirror is reflected, superimposed, and then converged to the operation area 5. In order to reduce the height of the reflector, the lamp cap of the operating lamp is lighter, thinner and more attractive, and the section of the reflector can be in a similar fold line form. Referring to fig. 1, the cross section of the reflector along the central axis is in a folded line shape. As shown in fig. 4, each bend in the reflector forms an annular reflective band 304 with a radius that increases stepwise in a top-to-bottom direction.

The reflection band may be formed by enclosing a plurality of planes, which are herein referred to as reflection band flaking, and the planes may be trapezoid planes, triangle planes, etc., as shown in fig. 4, and the trapezoid planes 305 are connected end to form an annular reflection band, so that the section of the reflection band along the radial direction is polygonal.

In another embodiment, as shown in fig. 5, the reflector may also be formed of a total reflection transparent element 6 employing the principle of total reflection. The light is transmitted into the reflecting surface through the first surface, and when the light reaches the reflecting surface, the light emits total reflection if the incident angle is larger than the total reflection angle, and the reflected light is refracted through the lower surface, emitted, overlapped and converged in the operation area 5. The cross section of the transparent element 6 in fig. 5 may also take the form of a fold line like in the figure, in order to reduce weight and height.

In general, the production process of the reflector determines that the reflecting surface of the reflector is more easily influenced by factors such as environment, wiping and the like; therefore, the operating lamp using the reflecting shade also comprises a lamp cap rear cover, a light-transmitting lamp cap front cover and other elements on the lamp cap, and the reflecting shade is protected between the two elements. The transparent element in the total reflection scheme is generally processed by adopting an injection molding or mould pressing process, a reflective film layer is not needed, and the surface of the transparent element has good weather resistance and scratch resistance, so that the transparent element can be directly presented to a user without the protection of a lamp cap rear cover and/or a lamp cap front cover. Thus, the total reflection scheme can reduce the components of the operating lamp, and the operating lamp is more beautiful, and has more design sense and high-grade sense.

When the light-emitting device works, light 4 emitted by the light source 1 is collected through the light deflection element 2, and the light is deflected in the emergent direction by utilizing the transmission, reflection or total reflection effect, and then is deflected at a large angle and is emitted to the periphery of the lamp cap in a nearly horizontal direction. The light rays emitted to the periphery are collected by the reflecting cover 3 and reflected to the operation area 5, and the reflected light rays 4 are mutually overlapped in the operation area 5, so that the operation lamp with a certain lamp base area and good shadowless effect is finally formed.

According to the embodiment, through the cooperation of the light deflection element and the reflecting shade, light rays of all angles emitted by the light source can be effectively utilized, and when the operating lamp is installed, the size of a formed light spot can be changed by changing the distance from the operating lamp to an operating area.

Because the geometric dimension of the reflecting cover in the scheme is far larger than the dimension of the combined light source, for example, when the operating lamp only uses one large reflecting cover, the diameter of the circular large reflecting cover is generally 400-750 mm, and the dimensions of the LED light source, the optical fiber bundle and the like are generally 0.01-20 mm, compared with the reflecting cover, the combined light sources can be regarded as an approximate small light source, and sub light sources of the small light source form overlapped diffuse spots in an operation area after being reflected by the reflecting cover, so that the large reflecting cover in the scheme is very favorable for uniformly mixing light of the combined light source. In addition, the reflector is further flaked, so that the uniformity of mixed light can be further enhanced, and light rays emitted by all different types of light sources can uniformly irradiate the operation area after being reflected, mixed and overlapped by the reflector, so that the non-uniformity of spectral space distribution in light spots of the operation area can be avoided or reduced.

Meanwhile, when a plurality of light sources are arranged, the light rays of different light sources are firstly mixed at the reflecting shade inside the lamp cap and then reflected to the operation area, which is equivalent to the emission of the light rays through one lighting unit, so that when objects such as the head, the arm, the hand and the like of a doctor are shielded between the lamp cap and the operation area, obvious color stripes can not appear in the operation area.

In general, the distance from the operating lamp to the operating area in the operating process is kept unchanged after being adjusted according to the height of a doctor, but in the using process of the operating lamp, different operating processes and types can be required for the operating field, and then the spot size of the operating lamp needs to be adjusted. In the case of multiple light sources, the spot size can be varied by adjusting the illumination of the different light sources.

As shown in fig. 1, the light source 1 is located at the center of the operating lamp, that is, the optical axis of the light source 1 coincides with the central axis of the operating lamp, and after the light 4 is collected and deflected by the light deflecting element 2 and reflected by the reflecting shade, the collected light spots are located on the central axis of the operating lamp. In this embodiment, a multiple light source scheme is adopted, and multiple light sources may be arranged in a square array or may be arranged in multiple concentric circles. When the spot size needs to be changed, a peripheral light source of the central light source or a combination light source of the central light source and the peripheral light source can be adopted. When the peripheral light source or the combined light source works, the light is collected by the reflecting cover and reflected to the operation area. Because the optical axis of the light source is deviated from the central axis, the light can not be completely converged by the reflector, so that a large light spot is formed in the operation area. As shown in fig. 6, the light rays emitted by the off-center peripheral light source 7 are deflected by the light deflecting element 2 to generate light rays in different directions, the light rays are not kept horizontal any more relative to the light rays in fig. 1, and have larger deflection angles, the light rays are reflected by the reflecting cover 3 to generate divergent light rays 8 with different irradiation directions and positions, finally, a larger area illumination spot is formed in the operation area 5, and the illumination spot is deviated from the optical axis of the light source. Therefore, by adopting the operating lamp provided by the embodiment of the invention, if the size of the illumination spot of the operating area needs to be adjusted to adapt to the operation of different incision sizes, the operation can be realized by adjusting the light emitting area of the light source combination; when a small light spot is needed, only a light source close to the center is used for emitting light; when a large spot is desired, the intensity can be increased away from the central light source. By the method, the light spot size can be quickly and quietly adjusted, and clinical experience of a user is facilitated.

Spot size may be adjusted by means of a spot adjusting assembly, examples of which are shown in fig. 7-9. As shown in fig. 7, the spot adjusting assembly includes a first cylindrical barrel 9 and a second cylindrical barrel 10, which may be cylindrical barrels or prismatic barrels, the first cylindrical barrel 9 is nested inside the second cylindrical barrel 10, the first cylindrical barrel 9 and the second cylindrical barrel 10 are wound around the outside of the light deflecting element 2 and are disposed on the optical path between the light deflecting element 2 and the reflecting shade 3, a space is provided between the first cylindrical barrel 9 and the second cylindrical barrel 10 to form an air gap, and when the morphology of at least one of the first cylindrical barrel and the second cylindrical barrel is changed, the shape of the air gap is changed, and the spot size is adjusted by changing the shape of the air gap. The morphology of the first and second cylindrical barrels referred to herein includes shape and state, including positional variation. The morphology of the first and second cylinders can be adjusted by an adjusting device, as will be explained in detail below; the morphological changes of the first and second cylinders may also be achieved by the structural or material characteristics of the first and second cylinders themselves. For example, the outer surface of the first cylindrical barrel and the inner surface of the second cylindrical barrel may be deformed by being retracted and/or extended to change the shape of the air gap between the first cylindrical barrel and the second cylindrical barrel.

Referring to fig. 8A, the first cylindrical barrel 9 has a first concave-convex surface structure 9a on its outer surface, the second cylindrical barrel 10 has a second concave-convex surface structure 10a on its inner surface, and the first concave-convex surface structure and the second concave-convex surface structure may be directly formed on the outer surface of the first cylindrical barrel and the inner surface of the second cylindrical barrel, respectively, or a layer of concave-convex structure may be attached to the outer surface of the first cylindrical barrel and the inner surface of the second cylindrical barrel. An air gap 12 is provided between the first concave-convex surface structure and the second concave-convex surface structure, and the first cylindrical barrel 9 and the second cylindrical barrel 10 are relatively movable, and the shape of the air gap 12 is changed by the movement.

In this embodiment, the first concave-convex surface structure 9a is a first wave surface structure, and the second concave-convex surface structure 10a is a second wave surface structure, and in other embodiments, the first concave-convex surface structure and the second concave-convex surface structure may be concave points or convex points, or may be grooves or convex edges. The first wave surface structure and the second wave surface structure fluctuate along the circumferential direction, and the first columnar cylinder and the second columnar cylinder can be controlled to relatively move along the circumferential direction through the adjusting device, so that the shape of the air gap 12 is changed, and the adjusting principle is as follows:

The light source is placed in the center, an air gap is formed between two cylindrical waves, and the two waves are similar in shape. As shown in fig. 8A, which is a horizontal cross-sectional view showing the relative positions of the two cylinders in the small spot state, the peak point of the first cylindrical cylinder 9 corresponds to the valley point of the outer-ring second cylindrical cylinder 10, and an approximately parallel air gap 12 is formed between the first cylindrical cylinder 9 and the second cylindrical cylinder 10, as shown in fig. 8D. FIG. 8D shows the light ray direction in the horizontal section of the small spot, the light ray passes through the parallel air gap 12, the included angle 13 between the two boundaries of the air gap 12 is zero, which is equivalent to the light ray passing through a piece of flat glass, so that the outgoing direction of the light ray 14 is not changed after passing through two cylinders, and the light ray is deviated by a small displacement but is kept parallel to the incident direction; so that the light rays remain substantially in their original state after passing through the cylinder. After the first cylindrical barrel 9 is rotated, the peak point of the first cylindrical barrel 9 and the valley point of the outer ring second cylindrical barrel 10 are staggered for a certain distance, as shown in fig. 8B, a wedge-shaped air gap 12 with different sizes is formed between the first cylindrical barrel 9 and the second cylindrical barrel 10, as shown in fig. 8E, the included angle between the two boundaries of the air gap 12 is not zero, which is equivalent to the gradual change of the air gap 12 into an air convex lens, the refractive index of the cylindrical material is higher than that of air, and then the air convex lens has a divergent function, so that light rays are outwardly diverged through the wedge-shaped air gap 12, and the light spot size is increased. When the angle of rotation of the first cylindrical barrel is small, the wedge angle 15 of a portion of the air gap is small as light passes through the gap 12, through which light 16 is deflected by a small angle; the wedge angle 17 with an air gap is larger, through which the light ray 18 is deflected by a larger angle; therefore, after the light passes through the first and second cylindrical barrels, some of the light deflects less and some of the light deflects more, some of the light reflected by the reflecting cover deviates nearer from the central axis and some of the light deviates farther from the central axis, and finally the light is overlapped and combined together to form a light field with certain light intensity distribution; when the light rays deviating more from the nearer light rays, the light intensity is more concentrated on the optical axis, and a smaller light spot is observed and perceived by a user; when the light rays deviating far are more, the light intensity is increased around, and a larger light spot is observed by a user. Therefore, the light spot gradually becomes larger from smaller as the first cylindrical barrel rotates. Continuing to rotate the first cylindrical barrel 9, the peak point of the first cylindrical barrel 9 corresponds to the peak point of the outer ring second cylindrical barrel 10, the valley point corresponds to the valley point, and fig. 8C is a horizontal sectional view of the relative positions of the two cylinders in the maximum spot state, and a completely wedge-shaped air gap 12 is formed between the first cylindrical barrel 9 and the second cylindrical barrel 10. Fig. 8F shows the light ray with the largest light spot, the light ray passes through the wedge-shaped air gaps 12, all the air gaps have the largest wedge angle 19, and the light ray deflection angle 20 is the largest deflection angle, so that the light ray forms a largest light spot after being reflected by the reflector.

Therefore, when the air gap is in a parallel state, the light rays do not change angles, pass through the two cylinders to the reflecting cover, and form small light spots in the operation area after being reflected by the reflecting cover. When the light spot needs to be enlarged, one of the cylinders is rotated, the shape of the air gap is changed, wedge-shaped air is formed, light rays deflect left and right when passing through the two cylinders, and therefore after being reflected by the reflecting cover, the divergence angle of the light rays is further enlarged, and the large light spot is formed in an operation area.

In a further embodiment, as shown in fig. 9, the first and second wave surface structures fluctuate in the axial direction, and the first and second

cylindrical drums

21 and 22 are relatively movable in the axial direction. When the first cylindrical drum 21 and the second cylindrical drum 22 relatively move in the axial direction, the corresponding positions of the peak points and the valley points of the first wave surface structure and the second wave surface structure are changed, so that the wedge angle of the air gap is changed, and the spot size can be changed in the same way.

Fig. 10 discloses another solution of the spot adjusting assembly, as shown in fig. 10, the spot adjusting assembly includes a first light-transmitting plate 24 and a second light-transmitting plate 25, where the first light-transmitting plate 24 and the second light-transmitting plate 25 are disposed opposite to each other, for example, the first light-transmitting plate 24 and the second light-transmitting plate 25 are disposed parallel to each other, and the first light-transmitting plate 24 and the second light-transmitting plate 25 are located on a light path of light reflected by the reflector, where the first light-transmitting plate 24 and the second light-transmitting plate 25 can move relatively, where a surface of the first light-transmitting plate 24 facing the second light-transmitting plate has a third concave-convex surface structure, where a surface of the second light-transmitting plate 25 facing the first light-transmitting plate has a fourth concave-convex surface structure, and where an air gap 26 is formed between the third concave-convex surface structure and the fourth concave-convex surface structure. Based on the same principle as the third embodiment, when the relative positions of the first light-transmitting plate 24 and the second light-transmitting plate 25 are adjusted by the adjusting means, the shape of the air gap 26 can be changed, and the spot size can be changed based on the same principle as the third embodiment.

As shown in fig. 11, in the above embodiment, a filter 23 may be added between the light source 1 and the light deflecting element 2 to filter or reduce unwanted wavelength energy, and modulate the light source spectrum. For example, an infrared cut-off filter is added, near infrared light is reduced, and the lamplight luminescence performance of the operating lamp is improved; for another example, an optical filter for modulating a visible light wave band is added, so that the color temperature or the color rendering index of the light source is improved; for another example, a blue light partial cut-off filter is added, so that the blue light characteristic of the white light LED light source is improved, and the blue light hazard of the operating lamp is reduced. The scheme can also directly plate an optical film on the surface of the light deflection element to filter or reduce the unwanted wavelength energy.

In some embodiments, the lamp cap of the operating lamp includes a plurality of light emitting modules, each of which includes one of the above light emitting devices, and the plurality of light emitting modules may be individually mounted or integrally mounted and inclined at a predetermined angle such that the respective light emitting devices have a predetermined angle of inclination and such that their central axes intersect at one point. In this case, the light emitted by the light sources is reflected by the respective reflectors and then collected in one light spot.

The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Variations of the above embodiments may be made by those of ordinary skill in the art in light of the present teachings.

Claims

1. A spot adjustment assembly, characterized in that:

the light spot adjusting assembly is used for being arranged on a light path between the light source and the reflecting shade, and the reflecting shade comprises a top end, a bottom end with an annular opening and a reflecting body which gradually expands from the top end to the bottom end;

the light source is positioned at the top end area of the reflecting shade, the light emergent surface of the light source faces the bottom end of the reflecting shade, the light rays emitted by the light source at least comprise forward light and lateral light, at least part of the lateral light emitted by the light source passes through the light spot adjusting assembly and then is projected to the inner side of the reflecting body, and the reflecting body is used for reflecting the light rays emitted by the light source so as to be converged into light spots with preset sizes in a preset area;

the flare adjustment assembly includes:

the light incident surface of the second cylindrical barrel is provided with a second concave-convex surface structure, the first cylindrical barrel is nested inside the second cylindrical barrel, so that the first concave-convex surface structure and the second concave-convex surface structure are oppositely arranged and are provided with an air gap therebetween, and the second cylindrical barrel and the first cylindrical barrel can relatively move to change the shape of the air gap, so that the size of a light spot converged in a preset area is changed.

2. The spot-adjusting assembly of claim 1 wherein the first and second concave-convex structures are wavy structures and the wavy surfaces of the first and second concave-convex structures extend in a same direction.

3. The spot-adjusting assembly of claim 2 wherein the wave surfaces of the first and second concave-convex structures respectively undulate in a circumferential direction of a first cylindrical barrel nested within a second cylindrical barrel, the first and second cylindrical barrels being relatively rotatable in the circumferential direction; or the wave surfaces of the first concave-convex surface structure and the second concave-convex surface structure respectively fluctuate along the axial direction of the first columnar cylinder nested in the second columnar cylinder, and the first columnar cylinder and the second columnar cylinder can move relatively along the axial direction.

4. A light emitting device, comprising:

a light source for emitting light;

the reflector comprises a top end, a bottom end with an annular opening and a reflector extending from the top end to the bottom end, the light source is positioned in the top end area of the reflector, the light emergent surface of the light source faces the bottom end of the reflector, the light emitted by the light source at least comprises forward light and lateral light, at least part of the lateral light emitted by the light source passes through the light spot adjusting assembly and then is projected to the inner side of the reflector, and the reflector is used for reflecting the light emitted by the light source to be converged into a light spot with a preset size in a preset area;

The light spot adjusting assembly comprises a first cylindrical barrel and a second cylindrical barrel, the first cylindrical barrel and the second cylindrical barrel are surrounded on a light path between the light source and the reflecting cover, the first cylindrical barrel is nested inside the second cylindrical barrel, an air gap is formed between the first cylindrical barrel and the second cylindrical barrel, when the morphology of at least one of the first cylindrical barrel and the second cylindrical barrel changes, the shape of the air gap is changed, so that light incident on the reflecting cover can be adjusted by changing the shape of the air gap, and the size of a light spot converged in a preset area after the light is reflected by the reflecting cover is changed.

5. The light-emitting device according to claim 4, wherein an inner surface of the first columnar cylinder is a light incident surface, an outer surface is a light emitting surface, and the light emitting surface of the first columnar cylinder has a first concave-convex surface structure thereon;

the inner surface of the second cylindrical barrel is a light incident surface, the outer surface of the second cylindrical barrel is a light emergent surface, the light incident surface of the second cylindrical barrel is provided with a second concave-convex surface structure, the first concave-convex surface structure and the second concave-convex surface structure are arranged in a facing way, an air gap is arranged between the first concave-convex surface structure and the second concave-convex surface structure, and the second cylindrical barrel and the first cylindrical barrel can relatively move to change the shape of the air gap, so that the size of a light spot converged in a preset area is changed.

6. The light-emitting device according to claim 5, wherein the first concave-convex surface structure and the second concave-convex surface structure are wavy surface structures, and the extending directions of the wavy surfaces of the first concave-convex surface structure and the second concave-convex surface structure are identical.

7. The light-emitting device according to claim 6, wherein the wavy surfaces of the first concave-convex surface structure and the second concave-convex surface structure respectively oscillate in a circumferential direction of the first cylindrical barrel nested in the second cylindrical barrel, the first cylindrical barrel and the second cylindrical barrel being relatively rotatable in the circumferential direction, or the wavy surfaces of the first concave-convex surface structure and the second concave-convex surface structure respectively oscillate in an axial direction of the first cylindrical barrel nested in the second cylindrical barrel, the first cylindrical barrel and the second cylindrical barrel being relatively movable in the axial direction.

8. The light-emitting device according to claim 7, further comprising a light-deflecting element, which is located between the light source and the reflector, for collecting forward light and side light emitted from the light source, and adjusting a light propagation direction so that light emitted from the light-deflecting element is projected to an inside of a reflector of the reflector; the light spot adjusting assembly surrounds the light path between the light deflecting element and the reflector.

9. The light-emitting device according to claim 6, wherein the plurality of light sources is provided, and wherein the at least one light source comprises a first light source that emits light of a first color temperature and a second light source that emits light of a second color temperature.

10. A light emitting device, comprising:

a plurality of light sources for emitting light, the plurality of light sources including a first light source emitting light of a first color temperature and a second light source emitting light of a second color temperature;

wherein the predetermined size of the spot is varied by adjusting the illumination of different light sources;

or, the light emitting device further includes a light spot adjusting component, the light spot adjusting component is located on the light path after the light exits from the light deflection element, and the light spot adjusting component includes:

the light emitting device comprises a first columnar cylinder, a second columnar cylinder and a first lens, wherein the inner surface of the first columnar cylinder is a light incident surface, the outer surface of the first columnar cylinder is a light emitting surface, and the light emitting surface of the first columnar cylinder is provided with a first concave-convex surface structure; the light incident surface of the second cylindrical barrel is provided with a second concave-convex surface structure, the first cylindrical barrel is nested inside the second cylindrical barrel, so that the first concave-convex surface structure and the second concave-convex surface structure are oppositely arranged and are provided with an air gap therebetween, and the second cylindrical barrel and the first cylindrical barrel can relatively move to change the shape of the air gap, so that the size of a light spot converged in a preset area is changed.

11. The light emitting apparatus of claim 10, wherein the reflector has a bottom end diameter greater than a top end diameter, and the reflector gradually expands from the top end to the bottom end.

12. The light-emitting device according to claim 10, wherein the color temperature of the light source is adjusted by adjusting relative brightness of the first light source and the second light source.

13. An operating lamp comprising a lamp cap, characterized in that the lamp cap comprises a light emitting device according to any one of claims 4 to 12.