OCT (optical coherence tomography) lens with target display

Abstract

The utility model discloses an OCT (Optical Coherence Tomography) lens with target display, which comprises a shell with a connecting port arranged on the front side and a visual port arranged on the rear side; the target module comprises a light source, a pinhole diaphragm and an aspheric condensing lens which are obliquely arranged downwards and forwards, and the convex surface of the aspheric condensing lens is located on the bottom side; the lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from front to back, the first lens is obliquely arranged forwards from bottom to top, the first lens is located below the aspheric condensing lens, the first lens is used for refracting incident light of the aspheric condensing lens to the second lens, and the fifth lens is used for refracting the incident light of the aspheric condensing lens to the fifth lens. The second lens is used for converging incident light, the third lens is used for diverging the incident light, the fourth lens is used for collimating the incident light, and the fifth lens is used for converging the incident light. According to the utility model, the display with the target can be conveniently combined on the lens of the OCT system, the assembly and the use are convenient, and the accuracy and the stability of shooting are improved.

Description

Technical Field

[0001] The utility model relates to a visual instrument, in particular to an OCT lens with a target display. Background Art

[0002] Optical coherence tomography (OCT) is an imaging technique that uses near-infrared light to perform cross-sectional imaging of biological tissues. There are currently two common types of anterior segment OCT. One is achieved by switching the optical path between the anterior and posterior segments through the internal system of the OCT device, which has high requirements for the optical path system and is more complex. The second is an OCT module that can be directly installed on the original device to shoot the anterior segment. Although this type of OCT module can be installed on the existing OCT system to switch to shooting the anterior segment, it lacks a "target" for the human eye to look at, so there are limitations in the positioning and accurate shooting of the eyeball. Therefore, there is an urgent need for an OCT lens that can facilitate shooting of the anterior segment. Utility Model Content

[0003] The utility model aims to provide an OCT lens with a target display to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The solution of the utility model to solve the technical problem is:

[0005] An OCT lens with a target display comprises: a housing, a connection port is arranged on the front side, and a visual port is arranged on the rear side; a target module comprises a light source, a pinhole aperture and an aspheric condensing lens arranged obliquely downward and forward, wherein the convex surface of the aspheric condensing lens is located on the bottom side; a lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from front to back, wherein the first lens is arranged obliquely forward from bottom to top, the first lens is located below the aspheric condensing lens, the first lens is used to refract the incident light of the aspheric condensing lens to the second lens, the second lens is used to converge the incident light, the third lens is used to diverge the incident light, the fourth lens is used to collimate the incident light, and the fifth lens is used to converge the incident light.

[0006] This technical solution has at least the following beneficial effects: when in use, the connection port of the housing is connected to the OCT system, combined with the optical path of the original OCT system, the light emitted by the light source in the OCT system is parallel light of different fields of view after being emitted, and enters the lens group, at which time the light passes through the first lens, the second lens and the third lens in sequence to form divergent light, and then is emitted to the fourth lens for collimation, and then converged by the fifth lens, and the converged light is irradiated onto the anterior segment tissue of the person being photographed behind the visual port, and then the reflected light will return to the OCT system along the original optical path, be received by the instrument, and then be processed accordingly and displayed on the computer as a two-dimensional tomographic image of the anterior segment tissue, thereby realizing the switching of the original OCT system from shooting the posterior segment of the eye to shooting the anterior segment of the eye; and when it is necessary to bring When the target is displayed, most of the light emitted by the light source is blocked by the pinhole aperture, and a small part of the light passes through the aperture in the center of the micro pinhole aperture and is incident on the aspheric condensing lens for convergence. The converged light is incident on the inclined first lens and reflected, and then passes through the second lens, the third lens, the fourth lens, and the fifth lens and is incident on the anterior segment tissue of the subject behind the eye port, and finally converges and forms an image at the fundus. At this time, the human eye can observe the small green light spot in the center as the target from the eye port. The subject can reduce the movement of the eyeball by looking at the green light spot as the target, and ensure that the center of the eyeball is within the shooting range. In this way, the target display can be conveniently combined with the lens of the OCT system, which is easy to assemble and use, and improves the accuracy and stability of shooting.

[0007] As a further improvement of the above technical solution, a stopper protruding forward is provided on the front side of the shell, and a plurality of positioning holes are provided on the shell around the stopper.

[0008] As a further improvement of the above technical solution, the first lens is a bidirectional color mirror, both side surfaces of the first lens are coated with anti-reflection films, and the side of the first lens close to the second lens is coated with a high-reflection film.

[0009] As a further improvement of the above technical solution, the second lens is a double-cemented lens, and both side surfaces of the second lens are coated with anti-reflection films.

[0010] As a further improvement of the above technical solution, the third lens is a doublet lens, and both side surfaces of the third lens are coated with anti-reflection films.

[0011] As a further improvement of the above technical solution, the fourth lens is a meniscus lens, and both side surfaces of the fourth lens are coated with anti-reflection films.

[0012] As a further improvement of the above technical solution, the fifth lens is a meniscus lens, and both side surfaces of the fifth lens are coated with anti-reflection films.

[0013] As a further improvement of the above technical solution, the outer shell includes a straight cylinder and an oblique cylinder, the connecting port and the visual port are respectively arranged at two ends of the straight cylinder, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all arranged in the straight cylinder, the oblique cylinder is obliquely connected to the outside of the straight cylinder, and the light source, the pinhole aperture and the aspheric focusing lens are all connected in the oblique cylinder.

[0014] As a further improvement of the above technical solution, a push switch is connected to the top side of the housing, and the push switch is electrically connected to the light source.

[0015] As a further improvement of the above technical solution, a battery is arranged in the housing, and the battery is electrically connected to the light source.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following is a brief description of the drawings required for the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present utility model, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 It is an overall stereogram of the utility model.

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0020] Figure 3 The utility model needs to be equipped with a target display when the light path diagram.

[0021] Figure 4 This is a light path diagram when the utility model is not provided with a target display.

[0022] In the accompanying drawings: 110 - straight cylinder, 111 - connecting port, 112 - viewing port, 120 - inclined cylinder, 121 - push switch, 122 - battery, 210 - light source, 220 - pinhole aperture, 230 - aspheric focusing lens, 310 - first lens, 320 - second lens, 330 - third lens, 340 - fourth lens, 350 - fifth lens. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 and Figure 2 An OCT lens with a target display includes a housing, a target module and a lens group, wherein a connection port 111 is arranged on the front side of the housing, and a visual port 112 is arranged on the rear side of the housing. The target module includes a light source 210, a pinhole aperture 220 and an aspheric condensing lens 230 arranged obliquely downward and forward, wherein the convex surface of the aspheric condensing lens 230 is located at the bottom side, and the lens group includes a first lens 310, a second lens 320, a third lens 330, and a fourth lens 340 arranged in sequence from front to back. Together with the fifth lens 350, the first lens 310 is tilted forward from bottom to top, the first lens 310 is located below the aspheric condensing lens 230, the first lens 310 is used to refract the incident light of the aspheric condensing lens 230 to the second lens 320, the second lens 320 is used to converge the incident light, the third lens 330 is used to diverge the incident light, the fourth lens 340 is used to collimate the incident light, and the fifth lens 350 is used to converge the incident light.

[0028] As can be seen from the above, when in use, the connection port 111 of the housing is connected to the OCT system and combined with the optical path of the original OCT system, such as Figure 4 As shown, the light emitted by the light source 210 in the OCT system is parallel light of different fields of view after being emitted, and enters the lens group. At this time, the light passes through the first lens 310, the second lens 320 and the third lens 330 in sequence to form divergent light, and then is emitted to the fourth lens 340 for collimation, and then converged by the fifth lens 350. The converged light is irradiated onto the anterior segment tissue of the person being photographed behind the visual port 112, and then the reflected light will return to the OCT system along the original optical path, and will be received by the instrument and then processed accordingly, and then a two-dimensional tomographic image of the anterior segment tissue will be displayed on the computer, thereby realizing the switching of the original OCT system from photographing the posterior segment of the eye to photographing the anterior segment of the eye; as shown in FIG. Figure 3 As shown, when a target display is required, most of the light emitted by the light source 210 is blocked by the pinhole aperture 220, and a small part of the light passes through the aperture in the center of the micro pinhole aperture 220 and is incident on the aspheric condensing lens 230 for convergence. The converged light is incident on the inclined first lens 310 and reflected, and then passes through the second lens 320, the third lens 330, the fourth lens 340, and the fifth lens 350 and is incident on the anterior segment tissue of the subject behind the eye port 112, and finally converges and forms an image at the fundus. At this time, the human eye can observe a small green light spot in the center as a target from the eye port 112. The subject can reduce the rotation of the eyeball by looking at the green light spot as the target, and ensure that the center of the eyeball is within the shooting range. In this way, the target display can be conveniently combined with the lens of the OCT system, which is easy to assemble and use, and improves the accuracy and stability of shooting.

[0029] In order to facilitate the connection of the housing to the OCT system, in this embodiment, the front side of the housing is provided with a stopper protruding forward, and the housing is provided with a plurality of positioning holes around the stopper. When connected, the entire quick-matching connection can be connected to the OCT system through the stopper on the front side of the housing, and the plurality of positioning holes can respectively cooperate with the plurality of connection points on the OCT system, thereby achieving connection positioning and improving the stability of the housing when connected.

[0030] The first lens 310 is used to refract the incident light of the aspheric focusing lens 230 to the second lens 320. In this embodiment, the first lens 310 is a two-way color mirror. Both sides of the two-way color mirror are planes, one plane is arranged close to the connecting port 111, and the other plane is arranged close to the second lens 320. Both sides of the first lens 310 are coated with anti-reflection films, and the average reflectivity in the wavelength range of 780 to 1100nm is less than 0.6% and the maximum reflectivity is less than 1.2%, and the coating incident angle is 30°±20°. The side of the first lens 310 close to the second lens 320 is coated with a high-reflection film, and the average reflectivity in the wavelength range of 450 to 680nm is greater than 98.5%, and the coating incident angle is 30°±20°.

[0031] The second lens 320 is used to converge the incident light. In this embodiment, the second lens 320 is a doublet lens. One side surface of the second lens 320 is a convex surface, which is arranged close to the first lens 310, and the other side surface is a concave surface, which is arranged close to the third lens 330. Both sides of the second lens 320 are coated with an anti-reflection film, and the average transmittance in the wavelength range of 700 to 880nm is greater than 99.5% and the minimum transmittance is greater than 98.8%. The coating incident angle is 0°±35°, the coating range is greater than 95%, and the transmission eccentricity is less than 90″.

[0032] The third lens 330 is used to diverge the incident light. In the present embodiment, the third lens 330 is a doublet lens. One side surface of the third lens 330 is a convex surface, which is arranged close to the fourth lens 340, and the other side surface is a concave surface, which is arranged close to the second lens 320. Both sides of the third lens 330 are coated with an anti-reflection film, and the average transmittance in the wavelength range of 700 to 880 nm is greater than 99.5% and the minimum transmittance is greater than 98.8%. The coating incident angle is 0°±35°, the coating range is greater than 95%, and the transmission eccentricity is less than 90″.

[0033] The fourth lens 340 is used to collimate the incident light. In this embodiment, the fourth lens 340 is a meniscus lens. One side surface of the fourth lens 340 is a convex surface, which is arranged close to the fifth lens 350, and the other side surface is a concave surface, which is arranged close to the third lens 330. Both sides of the fourth lens 340 are coated with an anti-reflection film, and the average transmittance in the wavelength range of 700 to 880nm is greater than 99.5% and the minimum transmittance is greater than 98.8%, the coating incident angle is 0°±25°, the coating range is greater than 95%, and the transmission eccentricity is less than 90″.

[0034] The fifth lens 350 is used to converge the incident light. In the present embodiment, the fifth lens 350 is a meniscus lens. One side surface of the fifth lens 350 is a convex surface, which is arranged close to the fourth lens 340, and the other side surface is a concave surface, which is arranged close to the eye port 112. Both sides of the fifth lens 350 are coated with an anti-reflection film, and the average transmittance in the wavelength range of 700 to 880 nm is greater than 99.5% and the minimum transmittance is greater than 98.8%. The coating incident angle is 0°±15°, the coating range is greater than 95%, and the transmission eccentricity is less than 90″.

[0035] Since the target module is installed in the housing at an angle, in order to facilitate the assembly of the module, in this embodiment, the housing includes a straight body 110 and an oblique body 120, the connection port 111 and the visual port 112 are respectively arranged at the two ends of the straight body 110, the target module is installed in the oblique body 120, the first lens 310, the second lens 320, the third lens 330, the fourth lens 340 and the fifth lens 350 are all arranged in the straight body 110, the oblique body 120 is obliquely connected to the outside of the straight body 110, the light source 210, the pinhole aperture 220 and the aspheric focusing lens 230 are all connected in the oblique body 120, and the lens group is arranged in the straight body 110. In practical applications, the straight body 110 and the oblique body 120 can be formed separately, so that the internal components can be easily assembled, and the straight body 110 and the oblique body 120 are detachably connected, so as to realize the assembly of the two.

[0036] In some embodiments, a push switch 121 is connected to the top side of the housing, and the push switch 121 is electrically connected to the light source 210. When in use, the light source 210 is turned on and off by pressing the switch 121, so as to select whether to use the target module, thereby improving the flexibility of use. In addition, a circuit board can be arranged in the housing, and the push switch 121 and the light source 210 are electrically connected to the circuit board respectively.

[0037] In some embodiments, the light source 210 may be a green LED light, which can improve people's usage experience.

[0038] In order to make the overall structure more compact, in this embodiment, a battery 122 is disposed in the housing, and the battery 122 is electrically connected to the light source 210. In this way, no other power supply device needs to be connected during use, and the overall structure is more concise.

[0039] The preferred implementation modes of the present invention are specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An OCT lens with target display, characterized in that: include: The housing has a connection port on the front side and a visual port on the rear side; The target module comprises a light source, a pinhole aperture and an aspheric condensing lens arranged obliquely downward and forward, wherein the convex surface of the aspheric condensing lens is located at the bottom side; The lens group includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from front to back, wherein the first lens is arranged to tilt forward from bottom to top, the first lens is located below the aspheric condensing lens, the first lens is used to refract the incident light of the aspheric condensing lens to the second lens, the second lens is used to converge the incident light, the third lens is used to diverge the incident light, the fourth lens is used to collimate the incident light, and the fifth lens is used to converge the incident light.

2. The OCT lens with target display according to claim 1, characterized in that: The front side of the shell is provided with a stopper protruding forward, and the shell is provided with a plurality of positioning holes around the stopper.

3. The OCT lens with target display according to claim 1, characterized in that: The first lens is a two-way color mirror, both side surfaces of the first lens are coated with anti-reflection films, and a side of the first lens close to the second lens is coated with a high-reflection film.

4. The OCT lens with target display according to claim 1, characterized in that: The second lens is a doublet lens, and both side surfaces of the second lens are coated with anti-reflection films.

5. The OCT lens with target display according to claim 1, characterized in that: The third lens is a doublet lens, and both side surfaces of the third lens are coated with anti-reflection films.

6. The OCT lens with target display according to claim 1, characterized in that: The fourth lens is a meniscus lens, and both side surfaces of the fourth lens are coated with anti-reflection films.

7. The OCT lens with target display according to claim 1, characterized in that: The fifth lens is a meniscus lens, and both side surfaces of the fifth lens are coated with anti-reflection films.

8. The OCT lens with target display according to claim 1, characterized in that: The outer shell includes a straight cylinder and an oblique cylinder, the connecting port and the visual port are respectively arranged at two ends of the straight cylinder, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all arranged in the straight cylinder, the oblique cylinder is obliquely connected to the outside of the straight cylinder, and the light source, the pinhole aperture and the aspheric focusing lens are all connected in the oblique cylinder.

9. The OCT lens with target display according to claim 1, characterized in that: A push switch is connected to the top side of the housing, and the push switch is electrically connected to the light source.

10. The OCT lens with target display according to claim 1, characterized in that: A storage battery is arranged in the housing, and the storage battery is electrically connected to the light source.

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