Magnification and depth of field linkage adjustment method and surgical microscope

Abstract

The application discloses a linkage adjustment method of magnification and depth of field and a surgical microscope, and comprises the following steps: acquiring magnification information of the microscope, acquiring a preset depth of field depth associated with the magnification information, determining a target depth of field depth according to user input and / or the preset depth of field depth, and adjusting the size of a variable diaphragm so that the optical system obtains the target depth of field depth. Based on the difference between the requirements of doctors for the depth of field and the resolution, the optical system can be manually or automatically adjusted to the target depth of field depth according to the user input or the system preset information, the depth of field depth is flexibly adjusted, and the adaptability of the microscope and the user experience are improved.

Description

Technical Field

[0001] This invention relates to the field of signal control of optical microscopy systems, and in particular to a method for the coordinated adjustment of magnification and depth of field, and a surgical microscope. Background Technology

[0002] In ophthalmic surgery, ophthalmic surgical microscopes require depth-of-field enhancement to enable doctors to clearly observe the three-dimensional layered structure of the fundus tissue, thereby smoothly treating complex lesions or performing delicate operations.

[0003] In existing technologies, depth of field is improved by reducing the aperture diameter (i.e., the aperture stop diameter) of the microscope. This approach sacrifices some light transmission to reduce the numerical aperture (NA) of the optical system, thereby expanding the imaging depth of field range. Consequently, the greater the depth of field, the worse the resolution of the optical system. Furthermore, the microscope uses only a single, fixed aperture stop diameter at different magnifications, resulting in only one level of depth of field enhancement at each magnification. However, different surgeons have different needs for depth of field and resolution. Therefore, surgeons cannot flexibly adjust the depth of field according to individual operating habits or surgical scenarios, reducing the microscope's adaptability and leading to a poor user experience. Summary of the Invention

[0004] This invention provides a method for linking magnification and depth of field adjustment, as well as a surgical microscope, to at least solve the technical problems of low microscope adaptability and poor user experience in related technologies.

[0005] This invention provides a method for the coordinated adjustment of magnification and depth of field, comprising:

[0006] Obtain the magnification information of the microscope; Obtain preset depth of field information associated with the magnification information; The target depth of field is determined based on user input and / or the preset depth of field information; Adjusting the size of the variable aperture allows the optical system to obtain the target depth of field.

[0007] The preset depth of field information includes multiple preset magnifications and preset depth of field values ​​corresponding to multiple preset magnification levels. The preset depth of field information is editable.

[0008] The preset depth of field information includes preset depth of field values ​​for multiple magnification levels other than the preset magnification obtained through interpolation or fitting.

[0009] As one implementation method: there is a control module, which acquires real-time magnification information; The control module is communicatively connected to the variable aperture adjustment mechanism to control the adjustment of the variable aperture size. The control module controls the direction and rate of the variable aperture size adjustment based at least on real-time current magnification information, thereby adjusting the depth of field to approach or equal the target depth of field. The current magnification information includes the current magnification and changes in the current magnification.

[0010] As another implementation method: obtain the updated microscope magnification and the updated magnification, and automatically adjust the variable aperture size according to the updated magnification value to obtain the target depth of field, so that the target depth of field is the target preset depth of field value, which is the preset depth of field value of the corresponding magnification obtained according to the preset depth of field information and the updated magnification.

[0011] The target preset depth of field value is the preset depth of field value of a specific setting corresponding to the magnification.

[0012] The process of acquiring the updated microscope magnification and the updated magnification includes acquiring information on the change and stop states of the magnification adjustment. Based on this information, the aperture size adjustment is initiated or stopped to ensure the depth of field reaches the target depth of field, while ensuring that the magnification and depth of field adjustments are not performed simultaneously. When the depth of field reaches the target depth of field, the stop state information is updated to a non-stop state.

[0013] This invention provides a surgical microscope, comprising: A variable magnification body, consisting of multiple optical lens groups, can achieve different magnifications of the optical system; The size of the variable aperture can be adjusted via a variable aperture adjustment mechanism; The control module acquires the magnification information of the surgical microscope and adjusts the size of the variable aperture through the variable aperture adjustment mechanism. The storage module is used to store preset depth of field information.

[0014] This invention can automatically adjust to the target depth of field based on user input, allowing users to input according to their individual operating habits or surgical scenario requirements to flexibly adjust the depth of field, thereby improving the adaptability of the microscope and the user experience.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the relationship between optical elements and depth of field in an optical system; Figure 2 This is a flowchart illustrating a method for the coordinated adjustment of magnification and depth of field according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the optical system framework of the present invention. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] Depth of field is the range of distances in front of and behind a photographed object that can form a sharp image at the front of a camera lens or other imaging device. In other words, objects at the focus point plane of the photographed object will form a sharp image on the film, and there is a range from a certain point in front of the focus point plane to a certain point behind it, within which objects can form a sharp image. This range is called the depth of field.

[0020] The relationship between depth of field and the aperture value, focal length, shooting distance, and image quality requirements (expressed as the size of the permissible circle of confusion) used in the optical system is as follows:

[0021]

[0022]

[0023] in, It is the diameter of the permissible circle of confusion. For the lens focal length, This is the aperture value used by the lens. Object distance (e.g.) Figure 1 (As shown).

[0024] Therefore, appropriate depth-of-field settings facilitate better three-dimensional observation of objects and a fuller understanding of the field of vision. For a long time, related products lacked depth-of-field adjustment and configuration functions, and the crucial role of depth-of-field settings in enabling clearer observation of the visual field during surgery was not recognized.

[0025] In one embodiment of the present invention, Figure 2 This disclosure provides a method for the coordinated adjustment of magnification and depth of field, which may include the following steps: S201, Obtain the magnification information of the microscope; Obtain the preset depth of field information associated with the magnification information; S202, determine the target depth of field based on user input and / or the preset depth of field information; S203 adjusts the size of the variable aperture to allow the optical system to obtain the target depth of field.

[0026] The preset depth of field information is the preferred value or preferred range of depth of field at the corresponding magnification.

[0027] Generally, as a microscope or surgical microscope, its magnification can be set between 3.4 and 20.

[0028] See Figure 3 Within a single field of view, the magnification of an object can be adjusted by modifying the zoom element and related optical components. The zoom element comprises multiple optical lenses / groups. Furthermore, the magnification of the entire optical system can be adjusted by regulating the distance between the relevant optical lenses / groups.

[0029] The depth of field of the optical system can be adjusted by the size of the variable aperture.

[0030] It also features a variable aperture adjustment mechanism for adjusting the size of the variable aperture. The adjustment of the variable aperture size can be achieved via a motor, meaning that by changing the aperture size of the variable aperture, the depth of field of the entire optical system can be adjusted.

[0031] Furthermore, magnification can be adjusted in various ways. For example, as a surgical microscope, the magnification of the optical system can be adjusted via a foot pedal, maximizing the convenience of the surgical procedure. Magnification can also be adjusted using knobs or other methods; it can also be adjusted during surgery via a display device or a handheld device.

[0032] Furthermore, the magnification can be adjusted steplessly. For example, the magnification of the system can be continuously adjusted by a foot pedal; or it can be quickly adjusted to the corresponding magnification by using a preset magnification on the display device.

[0033] It is customizable, and the foot pedal can also quickly adjust to a specific magnification.

[0034] As an example, you can set 13 magnification levels, such as 20.4x, 17x, 15x, 13.6x, 12x, 10x, 9x, 8.5x, 8x, 7x, 6.3x, 5x, and 3.4x, as quick adjustment settings for the magnification.

[0035] It should be noted that foot pedals, knobs, or display devices can all serve as user input for magnification adjustment. Through this user input, the movement of specific optical components can be achieved, thereby adjusting the magnification.

[0036] Furthermore, the change in current magnification can be obtained through the user input or the control component that controls the movement of the associated optical components. For example, the direction and rate of change of the current magnification can be obtained. Obtaining the value of the current magnification is self-evident.

[0037] The system presets depth of field information associated with the magnification, and this preset depth of field information can be manually edited.

[0038] Furthermore, the depth of field can be adjusted steplessly or in increments.

[0039] For example, when using a motor to adjust the variable aperture size to change the depth of field, the stepless adjustment is based on actual needs and the performance of the motor, and is not an absolutely continuous adjustment.

[0040] Preferably, the size of the variable aperture is adjustable, meaning the diameter or aperture of the variable aperture is adjustable within the range of 2.6 mm to 5.2 mm.

[0041] Preferably, the motor controls the stroke change at 0.2mm intervals.

[0042] Similarly, depth of field can be adjusted via foot pedal, knob, or display device. Depth of field can also be adjusted automatically through the system's control program.

[0043] The user input can be direct user input, such as input via a foot pedal, knob, or display device; the user input can also be a program input or selection, such as a program parameter or process configuration.

[0044] Furthermore, the target depth of field can be obtained directly through user input; alternatively, it can be obtained through user configuration.

[0045] For example, the user input is a program configuration that determines the target depth of field as a certain set value of the preset depth of field for the corresponding magnification based on the current magnification and preset depth of field information.

[0046] Based on extensive testing and practical experience, this invention selects the optimal depth of field range for commonly used magnifications and provides depth of field values ​​for five different settings at each magnification level, offering various depth of field configurations, as shown in the table below: Table 1

[0047] The variable aperture size corresponding to different depths of field in this invention can be calculated according to the following formula:

[0048] in, This represents the depth of field of the lens, in millimeters (mm). For magnification, The wavelength is measured in millimeters (mm). The appropriate wavelength can be selected based on the product and its application. This is the numerical aperture value of the objective lens, in millimeters (mm).

[0049] The NA value is used to determine the corresponding variable aperture size. Generally, the variation of the NA value is determined by changing the size of the variable aperture.

[0050] The changes in the size of the variable aperture at different corresponding magnifications and depth of field settings are shown in the table below: Table 2

[0051] For magnifications other than those mentioned above, interpolation or fitting can be used to obtain the optimal depth of field range and corresponding depth of field values ​​for each magnification level. For example, Lagrange interpolation can be used to obtain the optimal depth of field range and corresponding depth of field values ​​for other magnification levels.

[0052] In another embodiment of the present invention, the following may be further included: It has a control module that acquires real-time magnification information; The control module is communicatively connected to the variable aperture adjustment mechanism, thereby controlling the adjustment of the variable aperture size; The control module controls the direction and rate of the variable aperture size adjustment based at least on the real-time current magnification information, thereby adjusting the depth of field to approach or equal the target depth of field.

[0053] The current magnification information includes the current magnification and changes in the current magnification.

[0054] Among them, the magnification information of the optical system can be obtained based on the movement and positional relationship of the optical components, or the current magnification of the optical system, as well as the direction and rate of change of the magnification, can be obtained based on the signal adjusted by the user.

[0055] It is common knowledge to those skilled in the art that the magnification of a current optical system can be obtained. The real-time magnification of an optical system can be derived from the parameters and positional relationships of its optical components.

[0056] It can also continuously obtain user input signals to obtain real-time adjustment direction and adjustment rate of magnification.

[0057] In this embodiment, the adjustment of magnification and the adjustment of depth of field are linked, or in other words, at least for a certain period of time, the adjustment of magnification and the adjustment of depth of field are performed simultaneously.

[0058] This implementation method ensures that the depth of field and magnification maintain or approach a specific relationship. This specific relationship can be obtained based on preset depth of field information.

[0059] The control module controls the direction and rate of the variable aperture size adjustment based at least on the real-time current magnification information, thereby adjusting the depth of field to approach or equal the target depth of field, where the target depth of field is a preset depth of field value for the corresponding magnification obtained based on preset depth of field information.

[0060] In another embodiment of the present invention, the following may be further included: The microscope magnification is updated and the updated magnification is obtained. Based on the updated magnification value, the variable aperture size is automatically adjusted to obtain the target depth of field, so that the target depth of field is the target preset depth of field value. The target preset depth of field value is the preset depth of field value of the corresponding magnification obtained based on the preset depth of field information and the updated magnification.

[0061] For example, the target depth of field value can always be the preset depth of field value of the third level of the updated magnification.

[0062] Furthermore, it also includes obtaining the updated microscope magnification and the updated magnification, including obtaining the change status information and stop status information of the magnification adjustment, and starting or stopping the size adjustment of the aperture according to the change status information and stop status information of the magnification, so that the depth of field reaches the target depth of field.

[0063] In this embodiment, the variable aperture is not adjusted when the magnification is adjusted, that is, the magnification and depth of field are not adjusted at the same time.

[0064] Specifically, the change state information includes a change state and a non-change state; the stop state information includes a stop state and a stop state. When the change state information is a non-change state and the stop state information is a stop state, the size adjustment of the aperture is initiated; in other states, the size adjustment of the aperture is stopped or not initiated.

[0065] Furthermore, when a change in magnification is detected, the magnification change status information is updated to 1 (i.e., change state) and the stop status information is updated to 0 (i.e., non-stop state); when the magnification remains constant and is maintained for a preset time, the magnification stop status information is updated to 1 (i.e., stop state), while the magnification change status information is updated to 0 (i.e., no change state). The preset time can be set to 0.1-1s, preferably 0.5s. When the depth of field reaches the target depth of field, the stop status information is updated to non-stop state.

[0066] When the depth of field reaches the target depth of field, a prompt message can be issued to indicate that the adjustment is complete. This prompt message can be sound, vibration, text on a display screen, or other conventional technical means that can be used by those skilled in the art to prompt the operator.

[0067] It should be noted that in this embodiment, when the motor is already running and a change in magnification is triggered, that is, when the magnification change status information is 1, the size adjustment of the variable aperture is triggered to stop or be interrupted.

[0068] It should be noted that the methods for identifying changes in magnification and stopping status information include, but are not limited to, the above-mentioned means, and will not be elaborated upon in this embodiment of the invention.

[0069] The present invention also discloses another embodiment, namely a surgical microscope, comprising: a variable magnification body, including multiple optical lens groups, which can realize the adjustment of different magnifications of the optical system; a variable aperture, the size of which can be adjusted by a variable aperture adjustment mechanism; a control module, which acquires the magnification information of the surgical microscope and adjusts the size of the variable aperture by the variable aperture adjustment mechanism; and a storage module for storing preset depth of field information.

[0070] Other embodiments of the present invention and the methods described herein can be applied to the surgical microscope described above. That is, one or more methods for the linkage adjustment of magnification and depth of field disclosed in the present invention can be applied to the surgical microscope.

[0071] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples, without contradiction.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for linking magnification and depth of field adjustment, characterized in that, include: Obtain the magnification information of the microscope; Obtain preset depth of field information associated with the magnification information; The target depth of field is determined based on user input and / or the preset depth of field information; Adjusting the size of the variable aperture allows the optical system to obtain the target depth of field.

2. The method according to claim 1, characterized in that: The preset depth of field information includes multiple preset magnifications and preset depth of field values ​​corresponding to multiple preset magnification levels.

3. The method according to claim 2, characterized in that: The preset depth of field information includes preset depth of field values ​​for multiple magnification levels other than the preset magnification obtained through interpolation or fitting.

4. The method according to any one of claims 1-3, characterized in that, include: It has a control module that acquires real-time magnification information; The control module is communicatively connected to the variable aperture adjustment mechanism, thereby controlling the adjustment of the variable aperture size; The control module controls the direction and rate of the variable aperture size adjustment based at least on the real-time current magnification information, thereby adjusting the depth of field to approach or equal the target depth of field. The current magnification information includes the current magnification and changes in the current magnification.

5. The method according to any one of claims 1-3, characterized in that, include: The microscope magnification is updated and the updated magnification is obtained. Based on the updated magnification value, the variable aperture size is automatically adjusted to obtain the target depth of field, so that the target depth of field is the target preset depth of field value. The target preset depth of field value is the preset depth of field value of the corresponding magnification obtained based on the preset depth of field information and the updated magnification.

6. The method according to claim 5, characterized in that, include: The target preset depth of field value is the preset depth of field value of a specific setting corresponding to the magnification.

7. The method according to claim 5 or 6, characterized in that, include: The process of acquiring the updated microscope magnification and the updated magnification includes acquiring the change status information and stop status information of the magnification adjustment, and based on the change status information and stop status information of the magnification, starting or stopping the adjustment of the aperture size so that the depth of field approaches or reaches the target depth of field, and ensuring that the adjustment of magnification and depth of field are not performed simultaneously.

8. The method according to claim 7, characterized in that: When the depth of field reaches the target depth of field, the stopping state information is updated to a non-stop state.

9. The method according to claim 3, characterized in that: The relationship between the magnification M and the preset depth of field value is as follows: When the magnification M = 20.4, the corresponding preset depth of field values ​​are 0.5mm, 0.7mm, 0.9mm, 1.1mm or 1.3mm; When the magnification M = 17, the corresponding preset depth of field values ​​are 1mm, 1.3mm, 1.6mm, 1.9mm or 2.2mm; When the magnification M = 15, the corresponding preset depth of field values ​​are 1.2mm, 1.7mm, 2.2mm, 2.5mm or 2.7mm; When the magnification M = 13.6, the corresponding preset depth of field values ​​are 1.5mm, 1.8mm, 2.2mm, 2.5mm or 3mm; When the magnification M = 12, the corresponding preset depth of field values ​​are 2mm, 2.5mm, 3mm, 3.5mm or 4mm; When the magnification M = 10, the corresponding preset depth of field values ​​are 3mm, 4mm, 4.5mm, 5mm or 5.5mm; When the magnification M = 9, the corresponding preset depth of field values ​​are 4.5mm, 5mm, 5.5mm, 6mm or 6.5mm. When the magnification M = 8.5, the corresponding preset depth of field values ​​are 5mm, 5.5mm, 6mm, 6.5mm or 7mm; When the magnification M = 8, the corresponding preset depth of field values ​​are 4.5mm, 5.5mm, 6.5mm, 7.5mm or 8.5mm; When the magnification M = 7, the corresponding preset depth of field value is 6mm, 7mm, 8mm, 9mm or 10mm; When the magnification M = 6.3, the corresponding preset depth of field values ​​are 6mm, 8mm, 10mm, 13mm or 15mm; When the magnification M = 5, the corresponding preset depth of field values ​​are 10mm, 12mm, 15mm, 18mm or 22mm. When the magnification M = 3.4, the corresponding preset depth of field values ​​are 20 mm, 25 mm, 30 mm, 35 mm or 40 mm.

10. A surgical microscope, characterized in that, include: A zoom lens, comprising multiple optical lens groups, allows for the adjustment of different magnifications of the optical system. The variable aperture can be adjusted in size via a variable aperture adjustment mechanism; The control module acquires the magnification information of the surgical microscope and adjusts the size of the variable aperture through the variable aperture adjustment mechanism. The storage module is used to store preset depth of field information.

Images