Parfocal mechanism for camera and eyepiece of operating microscope

Abstract

The utility model discloses a parfocal mechanism for a camera and an eyepiece of an operating microscope, which comprises a variable camera shooting objective lens mechanism arranged in a shell, the variable camera shooting objective lens mechanism comprises a camera shooting objective lens capable of axially moving, and an adjusting assembly for driving the camera shooting objective lens to axially move is arranged on the shell. And the adjusting assembly is in threaded connection with the camera objective lens. The camera objective lens is adjustable, so that the focal length of the camera is compensated, the camera and the binocular lens cone are synchronous and clear, and the problem that the camera and the binocular lens cone cannot be completely synchronous and clear is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical microscopes and relates to a parfocal mechanism for a surgical microscope camera and an eyepiece. Background Art

[0002] The surgical microscope consists of two single-person binocular surgical microscopes with small objective lenses, a binocular tube and a display screen for camera imaging, and the clarity of the two images needs to be synchronized when in use. The existing surgical microscope has the problem that when the camera image is clear, the binocular tube image is not clear enough. When the doctor operates and uses it, the camera imaging and the binocular tube are not synchronized, resulting in visual aberration, which affects the judgment.

[0003] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. Utility Model Content

[0004] The utility model aims to provide a parfocal mechanism for a surgical microscope camera and an eyepiece, and the focal length of the camera objective lens can be adjusted by designing the camera objective lens, so that the camera and the binocular tube can image synchronously and clearly, thereby making the use effect of the surgical microscope more perfect.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A surgical microscope camera and eyepiece parfocal mechanism comprises a variable imaging objective lens mechanism arranged in a shell, the variable imaging objective lens mechanism comprises an axially movable imaging objective lens, the shell is provided with an adjustment component for driving the imaging objective lens to move axially, the adjustment component is connected to the imaging objective lens via a thread.

[0007] Furthermore, the adjustment assembly includes a rotating shaft fixing seat arranged on the shell, a driving shaft is pivoted inside the rotating shaft fixing seat, one end of the driving shaft is connected to the adjustment knob, and the other end of the driving shaft is connected to the active bevel gear; a driven bevel gear that can rotate in situ is arranged on the camera objective lens, the driven bevel gear is meshed with the active bevel gear for transmission, and the driven bevel gear is threadedly connected to the camera objective lens.

[0008] Furthermore, the shaft fixing seat is arranged on the inner side of the shell, and the adjusting knob is arranged on the outer side of the shell.

[0009] Furthermore, a damping plate and a cap are arranged on the driving shaft, and the damping plate and the cap are arranged between the shell and the rotating shaft fixing seat.

[0010] Furthermore, the objective lens fixing seat is arranged in the housing, and an axial through hole for the camera objective lens to pass through is provided on the objective lens fixing seat.

[0011] Furthermore, one side of the driven bevel gear has a cylindrical structure, the cylindrical structure has a threaded chamber in the axial direction, and the outer surface of the camera objective lens is provided with an external thread corresponding to the threaded chamber.

[0012] Furthermore, a limiting groove is provided on the columnar structure, and the locking piece is inserted into the limiting groove and locked on the objective lens fixing seat.

[0013] Furthermore, the objective lens fixing seat is provided with a slot for installing a locking plate, and the slot is communicated with the axial through hole.

[0014] The above technical solution has the following beneficial effects: by making the camera objective lens adjustable, the camera focal length is compensated, so that the camera and the binocular lens barrel are synchronized and clear, solving the problem of incomplete synchronization and clarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0017] Figure 1 This is a schematic diagram of the local state structure provided by the utility model.

[0018] Figure 2 for Figure 1 Cross-sectional view along AA direction (including optical path routing).

[0019] Figure 3 This is a schematic diagram of a partial three-dimensional structure provided by the utility model.

[0020] Figure 4 The present invention is a three-dimensional schematic diagram of a variable camera objective lens mechanism provided by the present invention.

[0021] In the figure: 1-housing; 2-variable camera objective lens mechanism; 201-objective lens fixing seat; 202-camera objective lens; 203-driven bevel gear; 204-locking plate; 205-active bevel gear; 206-driving shaft; 207-adjusting knob; 208-rotating shaft fixing seat; 209-damping plate; 210-parallel cap; 3-beam splitter prism; 4-binocular tube. DETAILED DESCRIPTION

[0022] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example

[0024] See also Figure 1-Figure 4 As shown, a camera and eyepiece parfocal mechanism for a surgical microscope is arranged in a housing 1, and includes a variable camera objective lens mechanism 2. The variable camera objective lens mechanism 2 includes an objective lens fixing seat 201 fixed in the housing 1. An axial through hole is provided in the objective lens fixing seat 201 for a camera objective lens 202 to pass horizontally. A card slot is provided on the objective lens fixing seat 201. The card slot is communicated with the axial through hole and is used for installing a locking plate 204. The camera objective lens 202 is arranged in the axial through hole. An adjustment component for driving the camera objective lens 202 to move is arranged on the outer side. The adjustment component includes a driven bevel gear 203 threadedly connected to the camera objective lens 202, and an active bevel gear 205 meshed with the driven bevel gear 203. A driving shaft 206 is fixed on the active bevel gear 205. A rotating shaft fixing seat 208 is provided on the housing 1, and the driving shaft 206 is arranged on the rotating shaft fixing seat 208. An adjusting knob 207 is provided on the outside of the housing 1 , and the adjusting knob 207 is fixed on the driving shaft 206 .

[0025] In this embodiment, one side of the driven bevel gear 203 has a cylindrical structure, wherein a limiting groove is provided at the cylindrical structure; the cylindrical structure has a threaded chamber in the axial direction, and the outer surface of the corresponding camera objective lens is provided with an external thread corresponding to the threaded chamber. During assembly, the cylindrical structure is inserted into the axial through hole of the objective lens fixing seat 201 and the limiting groove thereon is exposed in the card slot, and the locking piece 204 is vertically placed downward in the limiting groove and fixed to the objective lens fixing seat 201 with screws. At this time, the locking piece 204 does not affect the transmission of the driven bevel gear 203, but will constrain the axial movement of the driven bevel gear 203.

[0026] Through the above design, the operator can manually rotate the adjustment knob 207 to drive the active bevel gear 205 to rotate clockwise or counterclockwise. Since the driven bevel gear 203 is always in meshing with the active bevel gear 205, the driven bevel gear 203 can only rotate in place and will not move forward and backward. The driven bevel gear 203 is threadedly connected to the camera lens 202, and the driven bevel gear 203 rotates in place to drive the camera lens 202 to move axially, thereby achieving the purpose of adjusting the focal length, improving the clarity of the camera, and making the camera and the binocular lens barrel synchronized and clear.

[0027] In this embodiment, a damping plate 209 and a cap 210 are also provided on the driving shaft 206. The damping plate 209 and the cap 210 are installed between the adjusting knob 207 and the rotating shaft fixing seat 208 (located between the shell and the rotating shaft fixing seat 208), which can play a role in adjusting the hand feel and preventing the gear from rotating.

[0028] The basic working principle of this focusing mechanism: The working principle of the focusing mechanism is that the microscope image light path passes through the large objective lens and the zoom body, and then enters the beam splitter prism 3. The light path is divided into two paths and enters the binocular tube 4 and the camera ( Figure 2 The binocular tube optical path is in the middle and upward, and the camera optical path is in the horizontal direction). Due to the difference between the small objective lens of the binocular tube and the camera objective lens, the images of the two cannot be synchronized to a clear state when the magnification is changed. Therefore, a variable camera objective lens mechanism is designed so that the images of the binocular tube and the camera can be synchronized and clearly used at any magnification to eliminate visual aberration.

[0029] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A camera and eyepiece parfocal mechanism for a surgical microscope, characterized in that: It comprises a variable camera objective lens mechanism arranged in a housing, the variable camera objective lens mechanism comprises a camera objective lens which can be axially moved, the housing is provided with an adjustment component for driving the camera objective lens to move axially, and the adjustment component is connected to the camera objective lens through a threaded connection; The adjustment component includes a rotating shaft fixing seat arranged on the shell, a driving shaft is pivoted in the rotating shaft fixing seat, one end of the driving shaft is connected to the adjustment knob, and the other end of the driving shaft is connected to the active bevel gear; a driven bevel gear that can rotate in situ is arranged on the camera objective lens, the driven bevel gear is meshed with the active bevel gear for transmission, and the driven bevel gear is threadedly connected to the camera objective lens.

2. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 1, characterized in that: The rotating shaft fixing seat is arranged on the inner side of the shell, and the adjusting knob is arranged on the outer side of the shell.

3. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 2, characterized in that: The driving shaft is provided with a damping plate and a cap, and the damping plate and the cap are arranged between the shell and the rotating shaft fixing seat.

4. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 1, characterized in that: The objective lens fixing seat is arranged in the housing, and an axial through hole for the camera objective lens to pass through is arranged on the objective lens fixing seat.

5. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 1, characterized in that: One side of the driven bevel gear has a columnar structure, the columnar structure has a threaded cavity in the axial direction, and the outer surface of the camera objective lens is provided with an external thread corresponding to the threaded cavity.

6. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 5, characterized in that: The columnar structure is provided with a limiting groove, and the locking piece is inserted into the limiting groove and locked on the objective lens fixing seat.

7. The camera and eyepiece parfocal mechanism for a surgical microscope according to claim 6, characterized in that: The objective lens fixing seat is provided with a slot for installing a locking plate, and the slot is communicated with the axial through hole.

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