Operating microscope zoom illumination system

Abstract

The utility model discloses a zoom illumination system of an operating microscope. The zoom illumination system comprises the zoom illumination system (100) of the operating microscope and a zoom system (200) of the operating microscope, the operating microscope zoom illumination system (100) comprises a light source module (1), a collimating lens group (2), a field diaphragm (3), a condenser group (4), an illumination reflector (5), an aperture diaphragm (6), a third condenser (7) and a large objective lens group (8). The collimating lens group (2) consists of a first collimating lens (201) and a second collimating lens (202); the collecting lens group (4) consists of a first collecting lens (401) and a second collecting lens (402); the large objective lens group (8) is composed of a first balsaming lens (801), a second balsaming lens (802) and a third balsaming lens (803). A new zoom structure is not needed, the structure and assembly are simple, and the cost is low.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a zoom illumination system for an operating microscope. Background Art

[0002] The illumination system of a surgical microscope uses multiple optical components to make the light emitted by the light source evenly incident on the object surface, thereby achieving uniform illumination of the object surface.

[0003] At present, there are generally two design methods for the illumination system of surgical microscopes: one is critical illumination, which is relatively simple in design. The illuminated surface and the light source are conjugate, and the illumination uniformity of the illuminated surface depends on the brightness uniformity of the light source itself, which has high requirements on the light source; the other is Köhler illumination, which is relatively complex in design. The illuminated surface and the field aperture are conjugate, and the illumination uniformity of the illuminated surface is less affected by the brightness uniformity of the light source. Therefore, Köhler illumination is generally used for the system with high requirements on the illumination uniformity of the illuminated surface. For Köhler illumination, a fixed focal length design is generally considered during design, that is, there is no axial movement of the lens or other means to achieve zoom in the illumination system, and the field diaphragm is only conjugate with the illuminated surface at a certain working distance (such as a working distance of 250mm). When the working distance of the surgical microscope changes, the illumination uniformity of the illuminated surface will be reduced and the center point of the illuminated surface will deviate from the center point of the field of view of the imaging light path. In order to prevent the field of view of the illuminated surface from deviating from the field of view of the imaging light path, the spot size of the illuminated surface will greatly exceed the field of view of the imaging light path, thereby reducing the energy utilization rate of the light source and the illumination of the illuminated surface.

[0004] In the Chinese patent "CN107315241A, a large objective lens system with continuous zoom for surgical microscope", the present invention belongs to the field of optical system design technology, and specifically relates to a large objective lens system for surgical microscope, especially a large objective lens system with continuous zoom. The large objective lens system with continuous zoom for surgical microscope proposed by the present invention has a fixed negative lens group, and a mechanical compensation method is used for zooming. The positive lens group is moved along the optical axis to achieve continuous zoom and adjustable depth of field, realizing a zoom design with a focal length range from 230mm to 400mm, a working distance from 150mm to 350mm, and a surgical surface observation range from Φ20mm to Φ125mm. At the same time, apochromatic technology is used in the optical design, and specific optical glass with abnormal dispersion coefficient is selected, so that the system has high resolution and clear images.

[0005] The existing surgical microscope zoom illumination technology currently uses the axial movement of the zoom group and compensation group inside the illumination system to achieve the centering and size scaling of the illumination spot. This zoom method has a complex optical element structure, is difficult to process and assemble, and is costly. Summary of the invention

[0006] The object of the present invention is to provide a zoom illumination system for a surgical microscope to solve:

[0007] 1. After the working distance of the surgical microscope is changed, the center of the illumination spot deviates from the center of the imaging optical path field of view;

[0008] 2. The size of the illumination spot is too large, far exceeding the field of view of the imaging light path;

[0009] 3. The uniformity of illumination on the illuminated surface decreases after the working distance changes;

[0010] 4. The optical components of the zoom method have complex structures, difficult assembly and high costs.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] The present invention provides a surgical microscope zoom illumination system, comprising a surgical microscope zoom illumination system and a surgical microscope magnification system.

[0013] The surgical microscope zoom illumination system comprises a light source module, a collimator lens group, a field diaphragm, a condenser lens group, an illumination reflector, an aperture diaphragm, a third condenser lens and a large objective lens group;

[0014] A collimator lens group is arranged on one side of the light source module, and a field stop is arranged on one side of the collimator lens group, and the collimator lens group consists of a first collimator lens and a second collimator lens;

[0015] A condenser lens group is arranged on a side of the field aperture away from the collimator lens group, and the condenser lens group consists of a first condenser lens and a second condenser lens;

[0016] An illumination reflector is arranged on one side of the condenser group, and an aperture stop is arranged on one side of the illumination reflector, and a third condenser is arranged on one side of the aperture stop;

[0017] The large objective lens group is arranged on one side of the third condenser, and the large objective lens group consists of a first cemented lens, a second cemented lens and a third cemented lens.

[0018] Preferably, the light emitted by the light source module passes through the collimating lens group and is incident on the field diaphragm as parallel light; the field diaphragm serves as the light source surface, and the light emitted by it passes through the condenser lens group and the third condenser to collimate the light beam, and the collimated light beam is incident on the large objective lens group as parallel light, and the large objective lens group focuses the parallel light and uniformly illuminates the object plane, wherein the object plane is the working surface of the surgical microscope, thereby forming an imaging light path of the surgical microscope.

[0019] Preferably, the light source module is a high-brightness LED light source, and the collimator lens group consists of a first collimator lens and a second collimator lens.

[0020] Preferably, the light source module is conjugate with the aperture diaphragm, wherein the conjugate is an object-image correspondence relationship, and is used for that when the aperture of the aperture diaphragm is changed, the size of the object plane illumination spot remains unchanged, but its illumination changes, and the larger the aperture of the aperture diaphragm, the greater the object plane illumination, the field diaphragm and the aperture diaphragm are multiple diaphragms of different apertures, and the diaphragm diameter can be 1 to 12 mm, and the illumination reflector is a 45° reflector, which is used to fold the light path and reduce the volume of the illumination light path in the vertical direction.

[0021] Preferably, the condenser lens group consists of a first condenser lens and a second condenser lens.

[0022] Preferably, the field stop is conjugate with the object plane, so that when the aperture of the field stop is changed, the illumination of the object plane remains unchanged, but the size of the illumination spot changes. The larger the aperture of the field stop, the larger the object plane spot.

[0023] Preferably, the large objective lens group is composed of a first cemented lens, a second cemented lens and a third cemented lens, wherein the first cemented lens and the second cemented lens constitute a zoom group for changing the spacing between the zoom group and the third cemented lens, and can be used to focus the imaging light path of the surgical microscope so that it can observe object planes at different working distances, and can also be used to focus the illumination light path of the surgical microscope so that it can illuminate object planes at different working distances and always keep the illumination spot centered.

[0024] Preferably, the working distance of the imaging optical path of the surgical microscope is 200 mm to 455 mm, the focusing distance of the large objective lens group is 0 to 21 mm, and the corresponding maximum imaging field diameter is 67 mm to 121 mm.

[0025] Preferably, the lens of the zoom illumination system of the surgical microscope consists of a first collimator, a second collimator, a first condenser, a second condenser and a third condenser.

[0026] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0027] 1. At the working distance of the surgical microscope, the center of the object illumination spot always coincides with the optical axis of the large objective lens, and the center of the field of view of the imaging light path always coincides with the optical axis of the large objective lens. That is, the zoom illumination system of the surgical microscope can satisfy the requirement that within the working distance range, the center of the illumination spot always coincides with the center of the field of view of the imaging light path.

[0028] 2. The size of the object surface illumination spot and the imaging field of view are constantly changing with the internal focusing of the large objective lens group, and the diameter of the illumination spot can always be slightly larger than the diameter of the imaging field of view, between 0 and 10 mm. The object surface spot size can be fully reduced according to design requirements to improve the utilization rate of light energy.

[0029] 3. Within the working distance range, the overall uniformity of the object surface illumination is above 90%, and a high uniformity is always maintained.

[0030] 4. The zoom illumination system of the surgical microscope utilizes a large objective lens group in the imaging light path for internal focusing, without the need for a new zoom structure, and has a simple structure and assembly and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a zoom illumination system for a surgical microscope according to the present invention;

[0032] Figure 2 The illumination light path and imaging light path diagram of a zoom illumination system of a surgical microscope of the present invention at a working distance of 200 mm;

[0033] Figure 3 This is a diagram of the illumination light path and imaging light path of a surgical microscope zoom illumination system at a working distance of 455 mm;

[0034] Figure 4 A light path diagram of a combination of white light and fluorescent illumination light paths in a zoom illumination system of a surgical microscope of the present invention;

[0035] Figure 5 This is a diagram of the illumination spot illumination distribution of a zoom illumination system of a surgical microscope of the present invention at a working distance of 200 mm;

[0036] Figure 6 This is the illumination spot illumination distribution diagram of a surgical microscope zoom illumination system at a working distance of 200mm;

[0037] Figure 7 The present invention is a schematic diagram of the process of a zoom illumination system for a surgical microscope.

[0038] Legend: 100, surgical microscope zoom illumination system; 200, surgical microscope zoom system; 1, light source module; 11, white light LED; 12, purple light LED; 2, collimator lens group; 201, first collimator lens; 202, second collimator lens; 3, field aperture; 4, condenser lens group; 401, first condenser lens; 402, second condenser lens; 5, illumination reflector; 6, aperture aperture; 7, third condenser lens; 8, large objective lens group; 9, dichroic mirror; 10, object plane. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can all be obtained from commercial channels.

[0040] To achieve the above object, the present invention provides the following technical solutions:

[0041] Reference Figure 1 - Figure 7 As shown, the present invention provides a surgical microscope zoom illumination system, including a surgical microscope zoom illumination system 100 and a surgical microscope magnification system 200;

[0042] The surgical microscope zoom illumination system 100 comprises a light source module 1, a collimating lens group 2, a field diaphragm 3, a condenser lens group 4, an illumination reflector 5, an aperture diaphragm 6, a third condenser lens 7 and a large objective lens group 8;

[0043] A collimator lens group 2 is arranged at one side of the light source module 1, and a field stop 3 is arranged at one side of the collimator lens group 2. The collimator lens group 2 consists of a first collimator lens 201 and a second collimator lens 202;

[0044] The condenser lens group 4 is arranged on a side of the field aperture 3 away from the collimator lens group 2, and the condenser lens group 4 is composed of a first condenser lens 401 and a second condenser lens 402;

[0045] An illumination reflector 5 is arranged on one side of the condenser lens group 4, and an aperture stop 6 is arranged on one side of the illumination reflector 5, and a third condenser lens 7 is arranged on one side of the aperture stop 6;

[0046] The large objective lens group 8 is arranged at one side of the third condenser 7 , and the large objective lens group 8 consists of a first cemented lens 801 , a second cemented lens 802 and a third cemented lens 803 .

[0047] The present invention is further configured such that the light emitted by the light source module 1 is incident on the field diaphragm 3 as parallel light after passing through the collimating lens group 2; the field diaphragm 3 serves as a light source surface, and the light emitted by it is collimated by the condenser lens group 4 and the third condenser lens 7, and the collimated light beam is incident on the large objective lens group 8 as parallel light, and the large objective lens group 8 focuses the parallel light to uniformly illuminate the object plane 10, wherein the object plane 10 is the working surface of the surgical microscope, thereby forming an imaging optical path of the surgical microscope.

[0048] The present invention is further configured as follows: the light source module 1 can be an LED light source of different colors or a halogen lamp of different colors, preferably a high-brightness LED light source, and the collimator lens group 2 is composed of a first collimator lens 201 and a second collimator lens 202 .

[0049] The present invention is further configured as follows: the light source module 1 is conjugate with the aperture diaphragm 6, wherein the conjugate is an object-image correspondence relationship, and is used for changing the aperture of the aperture diaphragm 6 so that the size of the object surface illumination spot remains unchanged, but its illumination changes. Within a certain range, the larger the aperture of the aperture diaphragm 6, the greater the illumination of the object surface. The field diaphragm 3 and the aperture diaphragm 6 can be one or more diaphragms of different apertures, or can be continuously adjustable diaphragms, and the diaphragm diameter can be 1 to 12 mm. The illumination reflector 5 is a 45° reflector, which is used to fold the light path and reduce the volume of the illumination light path in the vertical direction.

[0050] The present invention is further configured as follows: the condenser lens group 4 is composed of a first condenser lens 401 and a second condenser lens 402 .

[0051] The present invention is further configured as follows: the field stop 3 is conjugate with the object plane 10, so that when the aperture of the field stop 3 is changed, the illumination of the object plane remains unchanged, but the size of the illumination spot changes. Within a certain range, the larger the aperture of the field stop 3, the larger the object plane spot.

[0052] The present invention is further configured as follows: the large objective lens group 8 is composed of a first cemented lens 801, a second cemented lens 802 and a third cemented lens 803, wherein the first cemented lens 801 and the second cemented lens 802 form a zoom group for changing the spacing between the zoom group and the third cemented lens 803, and can be used to focus the imaging optical path of the surgical microscope so that it can observe object planes at different working distances, and can also be used to focus the illumination optical path of the surgical microscope so that it can illuminate object planes at different working distances and always keep the illumination spot centered.

[0053] The present invention is further configured as follows: the working distance of the imaging optical path of the surgical microscope is 200 mm to 455 mm, the focusing distance of the large objective lens group is 0 to 21 mm, and the corresponding maximum imaging field diameter is 67 mm to 121 mm.

[0054] The illumination light path spot of the surgical microscope is designed to be slightly larger than the imaging field diameter, which can be slightly larger than the imaging field by 0 to 50 mm, preferably 0 to 10 mm. When the working distance is 200 mm, the illumination light path and the imaging light path are as follows: Figure 2 The imaging optical path shown in the figure is not fully displayed, and only the zoom system 200 is displayed, and the illumination distribution of the illumination spot is as follows: Figure 4 As shown, the diameter of the light spot on the illuminated surface is about 73mm, and its illumination uniformity is above 90%;

[0055] When the working distance is 455mm, the illumination light path and imaging light path are as follows: Figure 3 The imaging optical path is not fully shown, only the zoom system 200 is shown, and the illumination spot illumination distribution is as follows: Figure 5 As shown, the diameter of the light spot on the illuminated surface is about 130 mm, and the illumination uniformity is above 90%.

[0056] The present invention is further configured as follows: the lens of the surgical microscope zoom illumination system 100 is mainly composed of a first collimator 201 , a second collimator 202 , a first condenser 401 , a second condenser 402 and a third condenser 7 .

[0057] Table 1:

[0058]

[0059] Table 1 shows the parameters of the surgical microscope illumination system.

[0060] like Figure 4 As shown, the present invention is further configured as follows: the surgical microscope zoom illumination system has three embodiments, which can be used as a surgical microscope white light illumination optical path, can also be used as a fluorescent illumination optical path, or can be used as both.

[0061] When using this system alone as white light illumination or fluorescent illumination, you only need to select different light source modules to achieve it. When using it at the same time, you need to use two sets of illumination light paths and use a dichroic mirror to combine the two beams of light.

[0062] In one embodiment, the white light illumination optical path is composed of a white light LED or a white light halogen lamp 11 , a collimator lens group 2 , a field aperture 3 and a condenser lens group 4 .

[0063] In another embodiment, the fluorescent illumination light path is composed of a purple LED 12, a collimating lens group 2, a field aperture 3 and a condenser lens group 4. The two light paths are combined through a dichroic mirror 9, and the illumination reflector 5 folds the light path, and finally focuses on the object plane 10 through a third condenser 7 and a large objective lens group 8, wherein the dichroic mirror 9 has high transmittance to white light and high reflectivity to purple light, preferably with a transmittance greater than 99% at 450-680nm and a reflectivity greater than 90% at 370-420nm.

[0064] In view of the above, in this application:

[0065] 1. At the working distance of the surgical microscope, the center of the object illumination spot always coincides with the optical axis of the large objective lens, and the center of the field of view of the imaging light path always coincides with the optical axis of the large objective lens, that is, the zoom illumination system of the surgical microscope can ensure that within the working distance range, the center of the illumination spot always coincides with the center of the field of view of the imaging light path;

[0066] 2. The size of the object surface illumination spot and the imaging field of view are constantly changing with the internal focusing of the large objective lens group, and the diameter of the illumination spot can always be slightly larger than the diameter of the imaging field of view, between 0 and 10 mm. The object surface spot size can be fully reduced according to design requirements to improve the utilization rate of light energy;

[0067] 3. Within the working distance range, the uniformity of the object surface illumination is above 90% overall, and it always maintains a high uniformity;

[0068] 4. The zoom illumination system of the surgical microscope utilizes a large objective lens group in the imaging light path for internal focusing, without the need for a new zoom structure, and has a simple structure and assembly and low cost.

[0069] The zoom illumination system of the surgical microscope in the present invention includes but is not limited to a large objective lens group of this type and parameters. Any large objective lens group with other combination structures and parameters that can be adjusted for focus can be applied to this zoom illumination.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A zoom illumination system for a surgical microscope, characterized in that: It comprises a surgical microscope zoom illumination system (100) and a surgical microscope magnification system (200); The surgical microscope zoom illumination system (100) comprises a light source module (1), a collimating lens group (2), a field diaphragm (3), a condenser lens group (4), an illumination reflector (5), an aperture diaphragm (6), a third condenser lens (7) and a large objective lens group (8); A collimator lens group (2) is arranged on one side of the light source module (1), and a field stop (3) is arranged on one side of the collimator lens group (2), wherein the collimator lens group (2) is composed of a first collimator lens (201) and a second collimator lens (202); A condenser lens group (4) is arranged on a side of the field aperture (3) away from the collimator lens group (2), and the condenser lens group (4) is composed of a first condenser lens (401) and a second condenser lens (402); An illumination reflector (5) is arranged on one side of the condenser lens group (4), and an aperture diaphragm (6) is arranged on one side of the illumination reflector (5), and a third condenser lens (7) is arranged on one side of the aperture diaphragm (6); The large objective lens group (8) is arranged on one side of the third condenser (7), and the large objective lens group (8) is composed of a first cemented lens (801), a second cemented lens (802) and a third cemented lens (803).

2. A surgical microscope zoom illumination system according to claim 1, characterized in that: The light emitted by the light source module (1) passes through the collimating lens group (2) and is incident on the field stop 3 as parallel light; the field stop (3) serves as a light source surface, and the light emitted by it passes through the condensing lens group (4) and the third condensing lens (7) to collimate the light beam, and the collimated light is incident on the large objective lens group (8) as parallel light; the large objective lens group (8) focuses the parallel light and evenly illuminates the object surface (10), wherein the object surface (10) is the working surface of the surgical microscope, thereby forming an imaging optical path of the surgical microscope.

3. A surgical microscope zoom illumination system according to claim 2, characterized in that: The light source module (1) is a high-brightness LED light source, and the collimator lens group (2) consists of a first collimator lens (201) and a second collimator lens (202).

4. The zoom illumination system for a surgical microscope according to claim 1, characterized in that: The light source module (1) is conjugate with the aperture stop (6), wherein the conjugate is an object-image correspondence relationship, and when the aperture of the aperture stop (6) is changed, the size of the object surface illumination spot remains unchanged, but its illumination changes; the larger the aperture of the aperture stop (6), the greater the illumination of the object surface; the field stop (3) and the aperture stop (6) are multiple stoppers of different apertures, and the stop diameter can be 1 to 12 mm; the illumination reflector (5) is a 45° reflector, and is used to fold the light path and reduce the volume of the illumination light path in the vertical direction.

5. The zoom illumination system for a surgical microscope according to claim 2, characterized in that: The condenser lens group (4) consists of a first condenser lens (401) and a second condenser lens (402).

6. The zoom illumination system for a surgical microscope according to claim 1, characterized in that: The field diaphragm (3) is conjugate with the object plane (10), and is used for changing the aperture of the field diaphragm (3), while the illumination of the object plane (10) remains unchanged, but the size of its illumination spot changes; the larger the aperture of the field diaphragm (3), the larger the spot on the object plane (10).

7. The zoom illumination system for a surgical microscope according to claim 2, characterized in that: The large objective lens group (8) is composed of a first cemented lens (801), a second cemented lens (802) and a third cemented lens (803), wherein the first cemented lens (801) and the second cemented lens (802) form a zoom group, which is used to change the distance between the zoom group and the third cemented lens (803), and can be used to focus the imaging light path of the surgical microscope so that object planes at different working distances can be observed. At the same time, it can be used to focus the illumination light path of the surgical microscope so that object planes at different working distances can be illuminated and the illumination spot can always be kept centered.

8. The zoom illumination system for a surgical microscope according to claim 7, characterized in that: The working distance of the imaging optical path of the surgical microscope is 200 mm to 455 mm, the focusing distance of the large objective lens group is 0 to 21 mm, and the corresponding maximum imaging field diameter is 67 mm to 121 mm.

9. The zoom illumination system for a surgical microscope according to claim 1, characterized in that: The lens of the surgical microscope zoom illumination system (100) is composed of a first collimator (201), a second collimator (202), a first condenser (401), a second condenser (402) and a third condenser (7).

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