Slit light generating assembly and handheld slit lamp microscope

Abstract

The present invention discloses a slit light generating component and a handheld slit lamp microscope, wherein the slit light generating component comprises: a lens barrel, a light source lens, a slit sheet and an LED lamp circuit board; the slit sheet is arranged inside the lens barrel along the cross-sectional direction, and a slit sheet support portion is arranged on the inner wall of the lens barrel and is located in front of the slit sheet along the optical path direction; an LED lamp is arranged on the LED lamp circuit board and is located in the rear of the slit sheet along the optical path direction, and a slit sheet pressing ring is arranged between the slit sheet and the LED lamp circuit board; the rear end of the lens barrel is provided with a lens barrel rear end cover sleeved therewith, and under the support of the lens barrel rear end cover, the slit sheet, the slit sheet pressing ring and the LED lamp circuit board are positioned in sequence along the optical path direction between the lens barrel rear end cover and the slit sheet support portion. The slit light generating component provided by the present invention has a simple structure and is easy to assemble, which can not only reduce production costs, but also has stable optical performance and is easy to use, which helps to improve inspection efficiency and inspection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of eye disease examination equipment, in particular to a slit light generating assembly of a slit lamp microscope used in ophthalmological examinations. The present invention also relates to a handheld slit lamp microscope provided with the slit light generating assembly. Background Art

[0002] The slit lamp microscope is an essential instrument for ophthalmic examination. During use, the light from the slit lamp illuminates the eye through a slit. Because it is a narrow slit light source, it is called a "light knife".

[0003] By shining this "light knife" on the eye to form an optical section, the health status of various parts of the eye can be observed. The principle is to utilize the "Tyndall phenomenon" of British physicist Tyndall, that is, when a beam of light passes through a colloid, a bright "path" can be observed in the colloid from the vertical direction of the incident light. This phenomenon is called the Tyndall phenomenon, also known as the Tyndall effect.

[0004] In order to effectively observe the health of the eyes, the slit lamp is usually installed in a relatively dimly lit room. The slit light source illuminates the eyes, and then the doctor observes the health of various parts of the eyes through a microscope.

[0005] The traditional slit lamp microscope consists of two parts: the lighting system and the binocular microscope, namely the "slit lamp" and the "microscope". In order to facilitate the slit light source to illuminate different parts of the eye from different angles, and the microscope to observe the eye from different angles, most slit lamps and microscopes have a left and right swing angle mechanically. Moreover, the light source of the slit lamp requires that the edge of the slit must be very flat, and the slit must be clearly imaged on the vertical plane of the center of the circle that swings left and right, and the focus of the microscope must also be focused on this vertical plane of the center of the circle.

[0006] Although this slit lamp microscope can observe superficial lesions very clearly, and can adjust the focus and light source width to make an "optical section" so that lesions in deep tissues can also be clearly seen, the slit light needs to go through a relatively complex optical path from the light source to finally form a usable light beam. Not only is the structure complex, the assembly is difficult, and the production cost is high, but the optical performance is not stable enough, and further improvements are needed. Summary of the invention

[0007] The object of the present invention is to provide a slit light generating assembly which has a simple structure and is easy to assemble, which can not only reduce production costs, but also has stable optical performance and is easy to use, thus helping to improve inspection efficiency and inspection accuracy.

[0008] Another object of the present invention is to provide a handheld slit lamp microscope equipped with the slit light generating component.

[0009] To achieve the above-mentioned purpose, the present invention provides a slit light generating component, comprising a lens barrel, a light source lens located at the front end of the lens barrel, and a slit piece and an LED lamp circuit board located inside the lens barrel; the slit piece is arranged inside the lens barrel along the cross-sectional direction, and a slit piece supporting portion located at the front side of the slit piece along the light path direction is provided on the inner wall of the lens barrel; an LED lamp located at the rear side of the slit piece along the light path direction is provided on the LED lamp circuit board, and a slit piece pressing ring is provided between the slit piece and the LED lamp circuit board; a lens barrel rear end cover which is sleeved therewith is provided at the rear end of the lens barrel, and under the support of the lens barrel rear end cover, the slit piece, the slit piece pressing ring and the LED lamp circuit board are positioned in sequence along the light path direction between the lens barrel rear end cover and the slit piece supporting portion.

[0010] Preferably, a protrusion supporting the LED lamp circuit board is provided on the inner surface of the rear end portion of the rear end cover of the lens barrel.

[0011] Preferably, the front end of the lens barrel is provided with a lens barrel front end cover which is sleeved therewith, and the front end portion of the lens barrel front end cover is provided with a through hole which passes through front and back along the center line of the optical path.

[0012] Preferably, the slit piece is circular with at least one straight edge, and the slit piece support portion is provided with a positioning groove for accommodating the slit piece, and the shape of the positioning groove matches the slit piece to limit the rotation of the slit piece in the positioning groove.

[0013] Preferably, the slit piece pressing ring is provided with symmetrically or circumferentially distributed arc-shaped pressing portions on the annular surface at the front end thereof, so as to press the slit piece through the arc-shaped pressing portions.

[0014] Preferably, the rear end of the lens barrel is provided with at least one open groove on the barrel wall which penetrates the wall thickness and extends axially, and the inner wall of the rear end cover of the lens barrel is provided with a convex rib which can engage with the open groove. After the lens barrel and the rear end cover of the lens barrel are sleeved, the unshielded front end part of the open groove forms a hole connecting the inner cavity of the lens barrel with the outside world, so as to lead out the wires of the LED lamp circuit board.

[0015] Preferably, a symmetrical wing-shaped protrusion is provided on the outer circumference of the lens barrel; and / or, at least one lateral positioning protrusion is provided on the outer circumference of the rear end cover of the lens barrel.

[0016] To achieve the above-mentioned other purpose, the present invention provides a handheld slit lamp microscope, comprising a handheld shell body, a macro lens arranged in the middle of the shell body and penetrating the shell body, and a slit lamp located above the macro lens, wherein the slit lamp is the above-mentioned slit light generating component, and the center line of the optical path of the slit light generating component is inclined forward and downward, forming an angle of 20° to 45° with the center line of the optical path of the macro lens.

[0017] Preferably, the optical path center line of the slit lamp and the optical path center line of the macro lens form an angle of 30°.

[0018] Preferably, the front surface of the shell body is formed with a forward-protruding fixing seat in the upper area of ​​the macro lens, and the lower side of the fixing seat has a sloped portion, and the sloped portion is provided with a lens hole; the lens barrel is located on the inner side of the lens hole, and the light source lens is located on the outer side of the lens hole; the light source lens passes through the lens hole and is connected to the lens barrel and / or the fixing seat by a thread.

[0019] The slit light generating assembly provided by the present invention arranges the slit sheet and the LED lamp, the core components for forming the slit light, inside the lens barrel, and at the same time, a slit sheet support portion is provided on the inner wall of the lens barrel, and a slit sheet pressing ring is provided between the LED lamp circuit board and the slit sheet. During assembly, the slit sheet, the slit sheet pressing ring and the LED lamp circuit board can be put in from the rear end of the lens barrel in sequence, and then the LED lamp circuit board, the slit sheet pressing ring and the slit sheet can be pressed onto the slit sheet support portion in an axially stacked manner along the direction of the light path through the lens barrel rear end cover located at the rear end of the lens barrel, and the light source lens can be connected to the front end of the lens barrel, most of the components are located in the straight line direction determined by the light path, and are nested and connected with each other based on the lens barrel to form a complete assembly, and the light does not need to be turned during the travel process. Compared with the prior art, the structure is simple, easy to assemble, and easy to use, which can not only reduce the production cost, but also have stable light performance and better imaging effect, which is helpful to improve the inspection efficiency and the accuracy of the inspection.

[0020] The present invention also provides a handheld slit lamp microscope. Since the slit light generating component has the above-mentioned technical effects, the handheld slit lamp microscope provided with the slit light generating component should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a slit light generating assembly provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the slit light generating assembly shown;

[0023] Figure 3A schematic diagram of the structure of a handheld slit lamp microscope provided by an embodiment of the present invention;

[0024] Figure 4 for Figure 3 A partial cross-sectional view of the handheld slit lamp microscope shown;

[0025] Figure 5 This is a structural schematic diagram showing that the optical path center line of the slit light generating assembly forms a 30° angle with the optical path center line of the macro lens.

[0026] In the figure:

[0027] 1. Slit light generating assembly 2. Lens barrel 2-1. Opening groove 2-2. Outer edge 2-3. Wing-shaped protrusion 3. Light source lens 4. Slit sheet 5. LED lamp 6. LED lamp circuit board 7. Lens barrel rear end cover 7-1. Raised rib 7-2. Positioning protrusion 8. Slit sheet support 9. Lead wire 10. Slit sheet pressure ring 10-1. Notch 11. Pressing part 12. Protrusion 13. Lens barrel front end cover 14. Handheld housing body 15. Macro lens 16. First support member 17. Second support member 18. Stop member 19. Fixing seat 20. Battery 21. USB charging port 22. Switch DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] In this article, the terms "upper, lower, left, right" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0030] Please refer to Figure 1 , Figure 2 , Figure 1 A schematic structural diagram of a slit light generating assembly provided in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the exploded structure of the slit light generating component shown.

[0031] As shown in the figure, in one embodiment, the provided slit light generating assembly 1 is mainly assembled from components such as a lens barrel 2, a light source lens 3, a slit plate 4, an LED lamp 5, an LED lamp circuit board 6 and a lens barrel rear end cover 7.

[0032] The lens barrel 2 is generally cylindrical, and its inner cavity forms an optical path channel that runs through the front and back. The slit plate 4, LED lamp 5 and LED lamp circuit board 6 are all installed inside the lens barrel 2. The light source lens 3 has a focusing function and is detachably installed at the front end of the lens barrel 2. The rear end of the lens barrel 2 is provided with a lens barrel rear end cover 7 that is sleeved therewith. The inner diameter of the lens barrel rear end cover 7 is slightly larger than the outer diameter of the rear end of the lens barrel 2, and the lens barrel rear end cover 7 is sleeved on the rear end of the lens barrel 2 from the outside.

[0033] A slit piece supporting portion 8 is provided on the inner wall of the middle part of the lens barrel 2. The supporting portion 8 is in an inner ring shape, dividing the inner cavity of the lens barrel 2 into a front cavity and a rear cavity, and is provided with an optical path through hole connecting the front cavity and the rear cavity. The outer diameter of the front cavity is slightly larger than the outer diameter of the rear cavity, and the inner diameter of the front cavity is also slightly larger than the inner diameter of the rear cavity. The slit piece 4 is arranged in the rear cavity of the lens barrel 2 along the cross-sectional direction and is located on the rear side of the slit piece supporting portion 8 along the optical path direction. The entire slit piece 4 is supported on the annular surface of the slit piece supporting portion 8 facing the rear side through the peripheral portion, and the slit thereon extends along the longitudinal direction.

[0034] The slit piece 4 is circular with a straight edge, which is equivalent to cutting off a small part of a circular slit piece 4. A positioning groove for accommodating the slit piece 4 is provided on the annular surface of the slit piece support portion 8 facing the rear side, and the shape of the positioning groove matches the shape of the slit piece 4. In this way, when the slit piece 4 is placed in the positioning groove, the straight edges of the two can limit the rotation of the slit piece 4 in the positioning groove, thereby ensuring that the slit light passing through the slit piece 4 will not be deflected.

[0035] The LED lamp circuit board 6 is disc-shaped, and the LED lamp 5 is welded at the central position of the LED lamp circuit board 6 on the side facing the slit piece 4, and is electrically connected to the LED lamp circuit board 6. Power supply wires 9 are welded at the upper and lower ends of the LED lamp circuit board 6. After the LED lamp circuit board 6 with the LED lamp 5 is installed in place, it is located on the rear side of the slit piece 4 along the direction of the light path, and can be spaced at an appropriate distance from the slit piece 4 without contacting the slit piece 4 to avoid damaging the slit piece 4. A slit piece pressing ring 10 is provided between the slit piece 4 and the LED lamp circuit board 6. The slit piece pressing ring 10 is provided with symmetrically distributed (or circumferentially distributed) arc-shaped clamping portions 11 on the annular surface at its front end to clamp the slit piece 4 through the arc-shaped clamping portion 11.

[0036] With the support of the rear end cover 7 of the lens barrel, the LED lamp circuit board 6, the slit piece pressure ring 10 and the slit piece 4 are positioned in sequence along the light path direction between the rear end cover 7 of the lens barrel and the slit piece supporting portion 8. That is to say, after the slit piece 4, the slit piece pressure ring 10 and the LED lamp circuit board 6 are sequentially loaded into the lens barrel 2 from the rear end, the rear end of the lens barrel 2 is sealed with the rear end cover 7 of the lens barrel, and the LED lamp circuit board 6, the slit piece pressure ring 10 and the slit piece 4 are sequentially pressed and positioned through the rear end cover 7 of the lens barrel, thereby completing the assembly quickly without the need to fix them separately.

[0037] In at least one embodiment, in order to facilitate the assembly of the above components, the rear end cover 7 of the lens barrel can fully support the LED lamp circuit board 6, and then press the slit sheet 4 through the slit sheet pressure ring 10, a protrusion 12 can be set on the inner end surface of the rear end cover 7 of the lens barrel to support the LED lamp circuit board 6 through the protrusion 12. The protrusion 12 shown in the figure is cylindrical and is located at the center of the inner end surface of the rear end cover 7 of the lens barrel, supporting the LED lamp circuit board 6 from the middle. In addition, the protrusion 12 may not be located at the center of the rear end cover 7 of the lens barrel. For example, a plurality of protrusions 12 can be designed on the inner end surface of the rear end cover 7 of the lens barrel, and these protrusions 12 can be distributed in a rectangular array or a circular array. This type of structure can also achieve the supporting effect on the LED lamp circuit board 6.

[0038] The front end of the lens barrel 2 is provided with a lens barrel front end cover 13 which is sleeved therewith. The inner diameter of the lens barrel front end cover 13 is slightly larger than the outer diameter of the front end of the lens barrel 2. The lens barrel front end cover 13 is sleeved on the front end of the lens barrel 2 from the outside. The front end of the lens barrel front end cover 13 is provided with a through hole which passes through front and back along the center line of the optical path to facilitate the installation of the light source lens 3.

[0039] In other embodiments, as a further improvement, the rear end of the lens barrel 2 is provided with two vertically symmetrical opening grooves 2-1 on the barrel wall, the two opening grooves 2-1 penetrate the wall thickness of the lens barrel 2 and extend along the axial direction of the lens barrel, and the inner wall of the rear end cover 7 of the lens barrel is provided with two vertically symmetrical convex ribs 7-1, and during the assembly process, the two convex ribs 7-1 can be engaged with the two opening grooves 2-1, and the relative positioning of the rear end cover 7 of the lens barrel and the lens barrel 2 can be achieved through the cooperation of the convex ribs 7-1 and the opening grooves 2-1, and the rear end cover 7 of the lens barrel can be prevented from rotating relative to the lens barrel 2. At the same time, the length of the opening groove 2-1 is greater than the depth of the rear end cover 7 of the lens barrel, and after the lens barrel 2 and the rear end cover 7 of the lens barrel are sleeved, the front end portion of the opening groove 2-1 that is not covered forms a hole that connects the inner cavity of the lens barrel 2 with the outside. In this way, the upper and lower wires 9 on the LED lamp circuit board 6 can be led outward from the upper and lower holes respectively.

[0040] During assembly, the wire 9 on the LED lamp circuit board 6 can enter the open groove 2-1 from the opening, and while pushing the LED lamp circuit board 6 inward, it slides to the front end of the open groove 2-1 with the LED lamp circuit board 6, and naturally forms a structure that passes outward after being sleeved. Compared with the structure of opening a hole on the lens barrel 2 and then passing the wire 9 out, there is no need to add additional perforation operations, which can not only greatly improve the assembly efficiency, but also, there is no need to bend or pull the wire 9, which can avoid damaging the wire 9 or pulling the wire 9 off the LED lamp circuit board 6.

[0041] In some other embodiments, if the thickness of the slit sheet pressure ring 10 is relatively large, the wire 9 of the LED lamp circuit board 6 needs to pass through the slit sheet pressure ring 6 before being led out. In this case, the same method can be used to design a symmetrical notch 10-1 on the slit sheet pressure ring 10. The depth of the notch 10-1 is greater than the diameter of the wire 9. After assembly, the notch 10-1 corresponds to the hole formed by the front end part of the opening groove 2-1, so that the wire 9 of the LED lamp circuit board 6 can be easily led out.

[0042] A ring-shaped outer edge 2-2 is also provided on the outer circumferential surface of the lens barrel 2, and symmetrical wing-shaped protrusions 2-3 are provided on the ring-shaped outer edge 2-2. By providing the wing-shaped protrusions 2-3, the lens barrel 2 can be easily assembled with other parts. For example, during the assembly process, the wing-shaped protrusions 2-3 on the lens barrel 2 can be clamped with fingers to place the lens barrel 2 in the lens barrel front end cover 13. Moreover, since the lens barrel 2, the lens barrel rear end cover 7 and the lens barrel front end cover 13 are injection molded parts, by designing the wing-shaped protrusions 2-3 on the lens barrel 2, it is also convenient to accurately shape during the injection molding process to prevent excessive deformation during the production process, which makes the parts unusable.

[0043] In addition, at least one lateral positioning protrusion 7-2 is provided on the outer peripheral surface of the rear end cover 7 of the lens barrel, so as to limit the position during assembly through the positioning protrusion 7-2. The positioning protrusion 7-2 in the figure is designed to be in the form of a limiting handle.

[0044] Please refer to Figure 3 , Figure 4 , Figure 3 A schematic diagram of the structure of a handheld slit lamp microscope provided by an embodiment of the present invention; Figure 4 for Figure 3 A partial cross-sectional view of a handheld slit lamp microscope is shown.

[0045] As shown in the figure, in addition to the above-mentioned slit light generating component, the present invention also provides a handheld slit lamp microscope, which is mainly composed of a handheld shell body 14, a macro lens 15, etc., wherein the macro lens 15 is arranged in the middle of the shell body 14 and is fixed on the shell body 14 through the body, and the slit lamp is located above the macro lens 15, wherein the slit lamp is the slit light generating component 1 described above.

[0046] Specifically, the housing body 14 has a flat shape with a set thickness, and the center line of the macro lens 15 is perpendicular to the flat surface of the housing body 14 .

[0047] The handheld shell body 14 has a front surface, a rear surface and an outer peripheral surface between the front surface and the rear surface. When held in one hand, the thumb of the medical staff can be supported on the rear surface, and the other four fingers can be supported on the front surface. It has high portability. The front surface and the rear surface can be either a plane or an arc surface with a certain curvature. The outer peripheral surface includes an upper peripheral surface, a lower peripheral surface, a left peripheral surface and a right peripheral surface. There is a smooth transition between two adjacent peripheral surfaces. Each outer peripheral surface can be a plane or an arc surface.

[0048] After being assembled into a finished product, the center line of the optical path of the slit light generating assembly 1 tilts forward and downward, forming an angle of 20° to 45° with the center line of the optical path of the macro lens 15 , and the intersection of the optical paths is located directly in front of the macro lens 15 .

[0049] As a more preferred solution, the optical path center line of the slit light generating assembly 1 and the optical path center line of the macro lens 15 form an angle of 30° (see Figure 5 ). When the light source lens 3 is 30° to the center line of the macro lens 15 and the macro lens 15 can clearly image the eye surface, the slit light can be guaranteed to be the thinnest and the imaging effect is better. For example, for a certain light source lens 3, it can be guaranteed that a common focus is formed at the 40mm focal point. Through the light source lens, the thinnest and brightest light can be adjusted at this distance, and during the imaging process, it will not affect the imaging of the macro lens and no interference effect will occur.

[0050] The housing body 14 is formed by the front housing and the rear housing, which are connected by buckles and screws. A first supporting component 16 is provided inside the rear housing at a position corresponding to the rear end cover of the lens barrel. The first supporting component 16 is located on the rear side of the rear end cover 7 of the lens barrel, has an inclined surface perpendicular to the axis of the slit light generating component 1, and supports the slit light generating component 1 from the rear through the inclined surface. Specifically, the first supporting component 16 can be a multi-channel supporting plate, the inclined surfaces of the multi-channel supporting plates are located in the same plane, and abut against the rear surface of the rear end cover 7 of the lens barrel through the inclined surface; at the same time, a second supporting component 17 is provided inside the rear housing at a position corresponding to the rear end cover 7 of the lens barrel. The second supporting component 17 is located below the rear end cover 7 of the lens barrel, has a supporting surface parallel to the axis of the slit light generating component 1, and supports the slit light generating component 1 from the lower part of the tail of the slit light generating component 1 upward through the supporting surface. Specifically, the second supporting component 17 can be a supporting block or a plurality of supporting plates, and the supporting surface formed by the second supporting component 17 can be a plane or an arc surface that matches the curvature of the outer peripheral surface of the lens barrel, and the slit light generating assembly 1 is supported upward through the supporting surface.

[0051] In addition, a stop component 18 can be set in the rear shell body. The stop component 18 is located on the front side of the positioning protrusion 7-2. It can limit the rear end cover 7 of the lens barrel by blocking the positioning protrusion 7-2 from moving forward. Specifically, it can be designed into various forms such as a stop block, a stop bar or a stop ring. It can be connected to the rear shell body internally by screws or by snaps, so as to be fixed on the front side of the positioning protrusion 7-2. It can also be an integrated structure with the rear shell body, and form a limit seat together with the first support component 16 and the second support component 17.

[0052] The front surface of the shell body 14 is formed with a forward-protruding fixing seat 19 in the upper area of ​​the macro lens 15. The fixing seat 19 and the shell body 14 are an integral structure. The lower side of the fixing seat 19 has a sloped portion, which is substantially perpendicular to the center line of the optical path of the slit light generating component 1. The sloped portion is provided with a lens hole. The lens barrel 2 of the slit light generating component 1 is located on the inner side of the lens hole, and the light source lens 3 is located on the outer side of the lens hole. The light source lens 3 passes through the lens hole and is connected to the fixing seat 19.

[0053] Of course, the light source lens 3 can also be connected to the front end of the lens barrel 2, or connected to the fixing seat 19 and the front end of the lens barrel 2 at the same time. For example, the light source lens 3 is provided with an external thread, the front end of the lens barrel 2 is provided with an internal thread, and the light source lens 3 is screwed and connected to the lens barrel 2 through the thread, and / or the lens hole of the fixing seat 19 is provided with an internal thread, and the light source lens 3 is connected to the fixing seat 19 through the thread.

[0054] It should be noted that the connection between the light source lens 3 and the front end of the lens barrel 2 and / or the fixing seat 19 is not limited to direct connection, and an adapter may be provided between the two, and then an indirect connection is performed through the adapter.

[0055] The lower part of the housing body 14 is provided with a rechargeable battery 20 in the slit lamp power supply circuit assembly and a USB charging port 21 at the bottom. The side of the housing body 14 is provided with a dial switch 22 for controlling the on and off of the circuit. The USB charging port 21 is connected to the battery 20, and the battery 20 is connected to the LED light circuit board 6 through the switch 22. When the switch is closed, the LED light circuit board 6 is connected to the battery 20, and the battery 20 supplies power to the LED light circuit board 6; when the switch 22 is opened, the LED light circuit board 6 is disconnected from the battery 20, and the battery 20 no longer supplies power to the LED light circuit board 6.

[0056] The above embodiments are only preferred solutions of the present invention, and are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementations. For example, the slit plate pressure ring 10 and the rear end cover 7 of the lens barrel are an integrated structure; or a part of the light source lens 3 is located inside the fixing seat 19, and another part is located outside the fixing seat 19, etc. Since there are many possible implementation methods, they will not be described one by one here.

[0057] The slit light generating assembly provided by the present invention arranges the slit sheet 4 and the LED lamp 5, the core components for forming the slit light, inside the lens barrel 2, and at the same time, a slit sheet support portion 8 is provided on the inner wall of the lens barrel 2, and a slit sheet pressing ring 10 is provided between the LED lamp circuit board 6 and the slit sheet 4. During assembly, the slit sheet 4, the slit sheet pressing ring 10 and the LED lamp circuit board 6 can be put in from the rear end of the lens barrel 2 in sequence, and then the LED lamp circuit board 6, the slit sheet pressing ring 10 and the slit sheet 4 can be pressed on the slit sheet support portion 8 in an axially stacked manner along the light path direction through the lens barrel rear end cover 7 located at the rear end of the lens barrel 2, and the light source lens 3 can be connected to the front end of the lens barrel 2, and its components are basically located in the straight line direction determined by the light path, and are nested and connected with each other based on the lens barrel 2 to form a complete assembly, and the light does not need to be turned during the travel process. Compared with the prior art, the structure is simple, easy to assemble, and easy to use, which can not only reduce the production cost, but also have stable optical performance and better imaging effect, which helps to improve the inspection efficiency and accuracy.

[0058] The above is a detailed introduction to the slit light generating assembly and the handheld slit lamp microscope provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A slit light generating component, characterized in that: The invention comprises a lens barrel (2), a light source lens (3) located at the front end of the lens barrel (2), and a slit sheet (4) and an LED light circuit board (6) located inside the lens barrel (2); the slit sheet (4) is arranged inside the lens barrel (2) along the cross-sectional direction, and a slit sheet support portion (8) is provided on the inner wall of the lens barrel (2) and is located in front of the slit sheet (4) along the optical path direction; an LED light (5) is provided on the LED light circuit board (6) and is located behind the slit sheet (4) along the optical path direction, and a slit sheet pressing ring (10) is provided between the slit sheet (4) and the LED light circuit board (6); a lens barrel rear end cover (7) which is sleeved therewith is provided at the rear end of the lens barrel (2), and under the support of the lens barrel rear end cover (7), the slit sheet (4), the slit sheet pressing ring (10) and the LED light circuit board (6) are supported on the lens barrel rear end cover (7). ) and the slit piece support portion (8) are positioned in sequence along the optical path direction; the slit piece (4) is circular with at least one straight-side portion, the slit piece support portion (8) is provided with a positioning groove for accommodating the slit piece (4), the shape of the positioning groove being consistent with the slit piece (4) so ​​as to limit the rotation of the slit piece (4) in the positioning groove; the rear end of the lens barrel (2) is provided with at least one opening groove (2-1) penetrating the wall thickness and extending axially, the inner wall of the lens barrel rear end cover (7) is provided with a convex rib (7-1) capable of engaging with the opening groove (2-1), and after the lens barrel (2) and the lens barrel rear end cover (7) are sleeved, the unshielded front end portion of the opening groove (2-1) forms a hole for connecting the inner cavity of the lens barrel (2) with the outside, so as to lead out the wire of the LED lamp circuit board (6) outward.

2. The slit light generating assembly according to claim 1, characterized in that: A protrusion (12) for supporting the LED lamp circuit board (6) is provided on the inner surface of the rear end portion of the lens barrel rear end cover (7).

3. The slit light generating assembly according to claim 1, characterized in that: The front end of the lens barrel (2) is provided with a lens barrel front end cover (13) sleeved therewith, and the front end of the lens barrel front end cover (13) is provided with a through hole that passes through the front and back along the center line of the optical path.

4. The slit light generating assembly according to claim 1, characterized in that: The slit sheet pressing ring (10) is provided with symmetrically or circumferentially distributed arc-shaped pressing portions (11) on the annular surface at the front end thereof, so as to press the slit sheet (4) through the arc-shaped pressing portions (11).

5. The slit light generating assembly according to any one of claims 1 to 4, characterized in that: Symmetrical wing-shaped protrusions (2-3) are provided on the outer circumference of the lens barrel (2); and / or at least one lateral positioning protrusion (7-2) is provided on the outer circumference of the rear end cover (7) of the lens barrel.

6. A handheld slit lamp microscope, characterized in that: The invention comprises a handheld housing body (14), a macro lens (15) arranged in the middle of the housing body (14) and penetrating the housing body (14), and a slit lamp located above the macro lens (15), wherein the slit lamp is a slit light generating assembly as claimed in any one of claims 1 to 5, and the optical path centerline of the slit light generating assembly is inclined forward and downward, forming an angle of 20° to 45° with the optical path centerline of the macro lens (15).

7. The handheld slit lamp microscope according to claim 6, characterized in that: The optical path center line of the slit lamp and the optical path center line of the macro lens (15) form an angle of 30°.

8. The handheld slit lamp microscope according to claim 6 or 7, characterized in that: The front surface of the housing body (14) is formed with a fixing seat (19) protruding forward in an area above the macro lens (14), and a lens hole is provided on the lower side of the fixing seat (19); the lens barrel (2) is located on the inner side of the lens hole, and the light source lens (3) is located on the outer side of the lens hole; the light source lens (3) passes through the lens hole and is connected to the lens barrel (2) and / or the fixing seat (19) by means of threads.

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