Oral cavity endoscope
By designing a multi-angle oral endoscope and utilizing a lens combination of an objective lens group, an aberration correction group, and an image-side telecentric lens group, the problems of small field of view and fixed viewing angle were solved, enabling multi-angle observation and clear imaging.
Patent Information
- Application Number
- CN202423019733.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Current oral endoscopes have a small field of view and a fixed viewing angle, which makes them inconvenient for doctors to use.
An oral endoscope was designed, comprising an objective lens group, an aberration correction group, and an image-side telecardioscope group. By adjusting the combination of lenses and optical path compensation, multi-angle observation can be achieved.
It meets the needs of multi-angle observation, improves the convenience and observation effect for doctors, and enhances the clarity of imaging and the uniformity of light.
Smart Images
Figure CN223845643U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to endoscope technical field, especially a kind of oral endoscope. BACKGROUND
[0002] Oral health is closely related to everyone's life, and oral endoscope is one of the most important medical devices in oral examination. Doctors observe and treat patients' oral conditions through oral endoscope.
[0003] The field of view of the existing oral endoscope is usually between 3°-50°, which is relatively small, and the viewing angle of the oral endoscope is 0°, which brings inconvenience to doctors during use. Therefore, we propose an oral endoscope with high adaptability and convenient for doctors to use and observe. UTILITARY MODEL CONTENT
[0004] The utility model aims to provide an oral endoscope to solve the problems raised in the background.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an oral endoscope, comprising:
[0006] An objective lens group, which includes a protective glass, a plano-concave lens, an equivalent flat lens and an optical path compensation lens. The plano-concave lens is arranged on the back of the protective glass, the equivalent flat lens is arranged on the back of the plano-concave lens, and the optical path compensation lens is arranged on the back of the equivalent flat lens.
[0007] An aberration correction group, which is arranged on the back of the objective lens group. The aberration correction group includes a first lens, a second lens, a third lens and a fourth lens. The second lens is arranged on the back of the first lens, the third lens is arranged on the back of the second lens, and the fourth lens is arranged on the back of the third lens.
[0008] An image-side telecentric lens group, which is arranged on the back of the aberration correction group. The image-side telecentric lens group includes a fifth lens and a sixth lens. The sixth lens is arranged on the back of the fifth lens.
[0009] Preferably, the protective glass is a flat glass, the thickness of the protective glass is 2mm, the protective glass is double-sided coated with a visible light band anti-reflection film, the plano-concave lens is a lanthanide crown glass, the concave curvature of the plano-concave lens is 0.48<ρ<0.52, the refractive index of the plano-concave lens is 1.68<n<1.74, the Abbe number of the plano-concave lens is v<55, the equivalent flat lens is an equivalent flat flint glass, the equivalent thickness of the equivalent flat lens is 10mm-20mm, the optical path compensation lens is a positive focal length, the convex curvature of the optical path compensation lens is 0.07<ρ<0.08, the refractive index of the optical path compensation lens is 1.75<n<1.83, and the Abbe number of the optical path compensation lens is v<44.6.
[0010] Preferably, the protective glass, the plano-concave lens, the equivalent flat lens, and the optical path compensation lens are arranged separately from each other and used to match different prisms.
[0011] Preferably, the first lens is a positive focal length meniscus thick lens, the convex curvature radius of the front surface of the first lens is 0.025<ρ<0.03, the convex curvature radius of the back surface of the first lens is 0.08<ρ<0.11, the refractive index of the first lens is 1.68<n<1.74, the Abbe number of the first lens is v<54, the second lens is a negative focal length meniscus lens, the concave curvature radius of the second lens is 0.08<ρ<0.11, the convex curvature radius of the second lens is 0.02<ρ<0.028, the refractive index of the second lens is 1.78<n<1.83, the Abbe number of the second lens is v<45, and the first lens and the second lens are arranged in a cemented manner.
[0012] Preferably, the third lens is a negative focal length meniscus lens, the convex curvature radius of the third lens is 0.08<ρ<0.1, the concave curvature radius of the third lens is 0.09<ρ<0.11, the refractive index of the third lens is 1.79<n<1.85, the Abbe number of the third lens is v<44.7, the fourth lens is a positive focal length meniscus thick lens, the convex curvature radius of the fourth lens is 0.085<ρ<0.11, the concave curvature radius of the fourth lens is 0.05<ρ<0.06, the refractive index of the fourth lens is 1.79<n<1.89, the Abbe number of the fourth lens is 52<v<55, and the third lens and the fourth lens are arranged in a cemented manner.
[0013] Preferably, the fifth lens is a negative focal length lens, the convex curvature radius of the fifth lens is 0.08 < p < 0.12, the concave curvature radius of the fifth lens is 0.09 < p < 0.11, the refractive index of the fifth lens is 1.5 < n < 1.6, the Abbe number of the fifth lens is v < 45, the sixth lens is a positive focal length double-convex lens, the convex curvature radius of the front surface of the sixth lens is 0.08 < p < 0.10, the convex curvature radius of the back surface of the sixth lens is 0.05 < p < 0.06, the refractive index of the sixth lens is 1.48 < n < 1.6, the Abbe number of the sixth lens is 61 < v < 65, and the fifth lens and the sixth lens are arranged in a cemented manner.
[0014] The technical effects and advantages of the present utility model are as follows:
[0015] (1) The thickness of the equivalent flat-plate lens in the objective lens group can be designed according to different turning angles of the prism optical path, which facilitates doctors to observe the turning angles of the intraoral endoscope, which are 0°, 20°, 70° and 90°, and the thickness of the optical path compensation lens is adjusted to compensate for the optical path difference caused by the lens with different turning angles. The protection glass, the plano-concave lens, the equivalent flat-plate lens and the optical path compensation lens are arranged separately, which are used to cooperate with different prisms to form an objective lens group with variable observation angles, and the requirement of doctors for multi-angle observation is met.
[0016] (2) The first lens and the second lens are cemented to effectively correct spherical aberration, coma and chromatic aberration, reshape the light beam, reduce the light divergence angle, and effectively reduce the size of the lens. The third lens and the fourth lens are approximately symmetrical to the first lens and the second lens in structure, which has a good balancing effect on the vertical aberration such as distortion and magnification chromatic aberration under the condition of optimizing spherical aberration and coma.
[0017] (3) The fifth lens and the sixth lens are cemented to further adjust the parallelism of the chief ray, so that the chief ray of the outgoing light is parallel to the optical axis direction, forming an image telecentric type light structure, ensuring sufficient focal depth, and enabling the receiver to move forward and backward within a focal depth range, which can ensure clear imaging of the optical system, and the light incident to the receiver is more uniform. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a side structure schematic view of the present utility model.
[0019] In the figure: 101, protection glass; 102, plano-concave lens; 103, equivalent flat-plate lens; 104, optical path compensation lens; 201, first lens; 202, second lens; 203, third lens; 204, fourth lens; 301, fifth lens; 302, sixth lens. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of the utility model.
[0021] The utility model provides a kind of oral cavity endoscope as Figure 1 As shown in a kind of oral cavity endoscope, including objective lens group, aberration correction group and image far focus lens group, objective lens group includes protection glass 101, plano-concave lens 102, equivalent flat lens 103 and optical path compensation lens 104, plano-concave lens 102 is set to the back of protection glass 101, equivalent flat lens 103 is set to the back of plano-concave lens 102, optical path compensation lens 104 is set to the back of equivalent flat lens 103, protection glass 101 is flat glass, the thickness of protection glass 101 is 2 millimeter, protection glass 101 double side is coated with visible light wave band antireflection film, can protect endoscope lens from external acid-base corrosion and dust oil stain pollution, plano-concave lens 102 is lanthanide crown plate glass, light is incident by the front plane of plano-concave lens 102, and is emitted from concave surface, the concave curvature of plano-concave lens 102 is 0.48 < p < 0.52, the refractive index of plano-concave lens 102 is 1.68 < n < 1.74, the Abbe number v of plano-concave lens 102 < 55, equivalent flat lens 103 is equivalent flat flint glass, the equivalent thickness of equivalent flat lens 103 is 10 millimeter-20 millimeter, optical path compensation lens 104 is positive focal length, the thickness of equivalent flat lens 103 can be designed according to different turning angle prism optical path, it is convenient for doctor to observe the turning angle of in-mouth endoscope for treatment 0 °, 20 °, 70 °, 90 °, the convex curvature of optical path compensation lens 104 0.07 < p < 0.08, the refractive index of optical path compensation lens 104 1.75 < n < 1.83, the Abbe number v of optical path compensation lens 104 < 44.6, light is incident from the plane of optical path compensation lens 104, and is emitted from convex surface, can be compensated by adjusting the thickness of optical path compensation lens 104 the optical path difference introduced by different turning angle lens, protection glass 101, plano-concave lens 102, equivalent flat lens 103 and optical path compensation lens 104 are mutually separated and set, for cooperation different prism, protection glass 101, plano-concave lens 102, equivalent flat lens 103 and optical path compensation lens 104 form the objective lens group of variable observation angle, realize the demand of doctor multi-angle use observation.
[0022] The aberration correction group is arranged on the back surface of the objective lens group, and includes a first lens 201, a second lens 202, a third lens 203 and a fourth lens 204.
[0023] The first lens 201 is a positive focal length meniscus thick lens, the convex surface of the first lens 201 has a curvature radius of 0.025 < p < 0.03, the convex surface of the back surface of the first lens 201 has a curvature radius of 0.08 < p < 0.11, the refractive index of the first lens 201 is 1.68 < n < 1.74, the Abbe number of the first lens 201 is v < 54, the first lens 201 can balance aberration and improve system clarity, the second lens 202 is a negative focal length meniscus lens, the concave surface of the second lens 202 has a curvature radius of 0.08 < p < 0.11, the convex surface of the second lens 202 has a curvature radius of 0.02 < p < 0.028, the refractive index of the second lens 202 is 1.78 < n < 1.83, the Abbe number of the second lens 202 is v < 45, the first lens 201 and the second lens 202 are arranged in a cemented manner, the cementing of the first lens 201 and the second lens 202 effectively corrects spherical aberration, coma and chromatic aberration, shapes the light beam, reduces the light divergence angle, and effectively reduces the size of the lens.
[0024] The third lens 203 is a negative focal length meniscus lens, the convex surface of the third lens 203 has a curvature radius of 0.08 < p < 0.1, the concave surface of the third lens 203 has a curvature radius of 0.09 < p < 0.11, the refractive index of the third lens 203 is 1.79 < n < 1.85, the Abbe number of the third lens 203 is v < 44.7, the fourth lens 204 is a positive focal length meniscus thick lens, the convex surface of the fourth lens 204 has a curvature radius of 0.085 < p < 0.11, the concave surface of the fourth lens 204 has a curvature radius of 0.05 < p < 0.06, the refractive index of the fourth lens 204 is 1.79 < n < 1.89, the Abbe number of the fourth lens 204 is 52 < v < 55, the third lens 203 and the fourth lens 204 are arranged in a cemented manner, and the third lens 203 and the fourth lens 204 are approximately symmetrically arranged with the first lens 201 and the second lens 202, which has a good balancing effect on vertical aberrations such as distortion and magnification chromatic aberration under the condition of optimizing spherical aberration and coma.
[0025] The image-side telecentric lens group is arranged on the back surface of the aberration correction group, and includes a fifth lens 301 and a sixth lens 302, and the sixth lens 302 is arranged on the back surface of the fifth lens 301.
[0026] The fifth lens 301 is a negative focal length lens, the convex radius of curvature of the fifth lens 301 is 0.08 < p < 0.12, the concave radius of curvature of the fifth lens 301 is 0.09 < p < 0.11, the refractive index of the fifth lens 301 is 1.5 < n < 1.6, the Abbe number of the fifth lens 301 is v < 45, the sixth lens 302 is a positive focal length double-convex lens, the convex radius of curvature of the front surface of the sixth lens 302 is 0.08 < p < 0.10, the convex radius of curvature of the back surface of the sixth lens 302 is 0.05 < p < 0.06, the refractive index of the sixth lens 302 is 1.48 < n < 1.6, the Abbe number of the sixth lens 302 is 61 < v < 65, the fifth lens 301 and the sixth lens 302 are arranged in a cemented manner, the chief ray parallelism is further adjusted, the chief ray of the outgoing light is parallel to the direction of the optical axis, the image-side telecentric light structure is formed, sufficient focal depth is ensured, the receiver can be moved forward and backward within a focal depth range, the optical system can ensure clear imaging, and the light incident to the receiver is more uniform.
[0027] It should be finally pointed out that: the above only describes preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. An intraoral camera, characterized by comprising: It includes: Objective lens group, the objective lens group includes protection glass (101), flat concave lens (102), equivalent flat lens (103) and optical path compensation lens (104), the flat concave lens (102) is arranged at the back of protection glass (101), the equivalent flat lens (103) is arranged at the back of flat concave lens (102), the optical path compensation lens (104) is arranged at the back of equivalent flat lens (103); Aberration correction group, the aberration correction group is arranged at the back of objective lens group, and the aberration correction group includes first lens (201), second lens (202), third lens (203) and fourth lens (204), the second lens (202) is arranged at the back of first lens (201), the third lens (203) is arranged at the back of second lens (202), and the fourth lens (204) is arranged at the back of third lens (203); Image telecentric lens group, the image telecentric lens group is arranged at the back of aberration correction group, and the image telecentric lens group includes fifth lens (301) and sixth lens (302), and the sixth lens (302) is arranged at the back of fifth lens (301).
2. The intra-oral camera of claim 1, wherein The protection glass (101) is flat glass, the thickness of the protection glass (101) is 2mm, the protection glass (101) is double-sided coated with visible light band antireflection film, the flat concave lens (102) is lanthanide crown glass, the concave curvature of the flat concave lens (102) is 0.48 < p < 0.52, the refractive index of the flat concave lens (102) is 1.68 < n < 1.74, the Abbe number v of the flat concave lens (102) is less than 55, the equivalent flat lens (103) is equivalent flat flint glass, the equivalent thickness of the equivalent flat lens (103) is 10mm-20mm, the optical path compensation lens (104) is positive focal length, the convex curvature of the optical path compensation lens (104) is 0.07 < p < 0.08, the refractive index of the optical path compensation lens (104) is 1.75 < n < 1.83, and the Abbe number v of the optical path compensation lens (104) is less than 44.
6.
3. An intra-oral camera according to claim 2, wherein The protection glass (101), flat concave lens (102), equivalent flat lens (103) and optical path compensation lens (104) are arranged separately, and are used for matching different prisms.
4. The intra-oral camera of claim 1, wherein The first lens (201) is a positive focal length meniscus thick lens, the convex curvature radius of the front surface of the first lens (201) is 0.025<ρ<0.03, the convex curvature radius of the back surface of the first lens (201) is 0.08<ρ<0.11, the refractive index of the first lens (201) is 1.68<n<1.74, the Abbe number v of the first lens (201) is <54, the second lens (202) is a negative focal length meniscus lens, the concave curvature radius of the second lens (202) is 0.08<ρ<0.11, the convex curvature radius of the second lens (202) is 0.02<ρ<0.028, the refractive index of the second lens (202) is 1.78<n<1.83, the Abbe number v of the second lens (202) is <45, and the first lens (201) and the second lens (202) are cemented.
5. The intra-oral camera of claim 1, wherein The third lens (203) is a negative focal length meniscus lens, the convex curvature radius of the third lens (203) is 0.08<ρ<0.1, the concave curvature radius of the third lens (203) is 0.09<ρ<0.11, the refractive index of the third lens (203) is 1.79<n<1.85, the Abbe number v of the third lens (203) is <44.7, the fourth lens (204) is a positive focal length meniscus thick lens, the convex curvature radius of the fourth lens (204) is 0.085<ρ<0.11, the concave curvature radius of the fourth lens (204) is 0.05<ρ<0.06, the refractive index of the fourth lens (204) is 1.79<n<1.89, the Abbe number v of the fourth lens (204) is 52<v<55, and the third lens (203) and the fourth lens (204) are cemented.
6. The intra-oral camera of claim 1, wherein, The fifth lens (301) is a negative focal length lens, the convex curvature radius of the fifth lens (301) is 0.08<ρ<0.12, the concave curvature radius of the fifth lens (301) is 0.09<ρ<0.11, the refractive index of the fifth lens (301) is 1.5<n<1.6, the Abbe number v of the fifth lens (301) is <45, the sixth lens (302) is a positive focal length double convex lens, the convex curvature radius of the front surface of the sixth lens (302) is 0.08<ρ<0.10, the convex curvature radius of the back surface of the sixth lens (302) is 0.05<ρ<0.06, the refractive index of the sixth lens (302) is 1.48<n<1.6, the Abbe number v of the sixth lens (302) is 61<v<65, and the fifth lens (301) and the sixth lens (302) are cemented.