Combined prism for endoscope
By designing the second prism so that the light-transmitting and reflective surfaces are connected in parallel and staggered manner to form a stepped structure, the optical imaging problem of the light-transmitting and reflective surfaces being coplanar is solved, thereby improving the optical imaging quality and stability of the endoscope.
Patent Information
- Application Number
- CN202520066222.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-10
AI Technical Summary
In existing endoscopes, the coplanarity of the light-transmitting and reflective surfaces in the combined prisms affects the optical imaging effect and thus the quality of the optical image.
Design a combined prism structure in which the light-transmitting surface and the reflective surface of the second prism are parallel and connected by a staggered light-shielding surface to form a stepped structure. The first and second stepped parts fit together to facilitate alignment and enhance stability, and are fixed by adhesive bonding.
It improves optical imaging performance, enhances the stability of the combined prism, facilitates subsequent processing, and avoids the problem of interference between the light-transmitting and reflective surfaces.
Smart Images
Figure CN223728017U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a combined prism for endoscopes. Background Technology
[0002] An endoscope is a diagnostic instrument that integrates optical, electronic, and software technologies. It enters through the body's natural orifices to reach the location of the lesion to be examined, so as to perform real-time dynamic imaging monitoring of the lesion.
[0003] Optical prisms are an important component of endoscopes. Among the existing technologies, there is a type of combined prism used in endoscopes, such as... Figure 1 As shown, it includes a first prism 10', a second prism 20', and a third prism 30'. Figure 1 A broken line with continuous arrows indicates the propagation direction of the incident light beam. For example... Figure 2 As shown, the S1 surface of the second prism 20' is the light-transmitting surface, and the S2 surface is the light-reflecting surface. However, the light-transmitting surface and the light-reflecting surface are coplanar (on the same plane) and are prone to interference with each other, which affects the optical imaging effect. Utility Model Content
[0004] The purpose of this invention is to provide a combined prism for an endoscope, comprising a first prism, a second prism, and a third prism, wherein the second prism is disposed between the first and third prisms; the first prism has a first light-transmitting surface on one side and a first stepped portion on the other side; the first stepped portion includes a second light-transmitting surface, a first light-shielding surface, and a third light-transmitting surface connected in sequence, the second and third light-transmitting surfaces being parallel, and the first light-shielding surface being perpendicularly connected to the second and third light-transmitting surfaces; the second prism has a first reflective surface on one side and a second stepped portion on the other side; the second stepped portion... The second prism includes a fourth light-transmitting surface, a second light-shielding surface, and a second reflective surface connected in sequence. The fourth light-transmitting surface and the second reflective surface are parallel, and the second light-shielding surface is perpendicularly connected to the fourth light-transmitting surface and the second reflective surface. The second prism also has a fifth light-transmitting surface connecting the first reflective surface and the second reflective surface. The first stepped portion and the second stepped portion are shaped to match and abut against each other, wherein the second light-transmitting surface abuts against the fourth light-transmitting surface, the first light-shielding surface abuts against the second light-shielding surface, and the third light-transmitting surface abuts against the second reflective surface. The third prism has a sixth light-transmitting surface. The sixth light-transmitting surface and the first reflective surface are shaped to match and abut against each other.
[0005] In use, the first light-transmitting surface is used to allow the light beam to enter the first prism, the second light-transmitting surface is used to allow the light beam to exit from the first prism, the fourth light-transmitting surface is used to allow the light beam exiting from the second light-transmitting surface to enter the second prism, the first reflective surface is used to reflect the light beam entering the second prism to the second reflective surface, the second reflective surface is used to reflect the light beam to the fifth light-transmitting surface, and the fifth light-transmitting surface is used to allow the light beam to exit from the second prism.
[0006] The fourth light-transmitting surface and the second light-reflecting surface of the second prism are parallel, the light-transmitting and light-reflecting angles are consistent, and the fourth light-transmitting surface and the second light-reflecting surface are connected in a staggered manner through the second light-blocking surface to form a stepped second step part, so that the fourth light-transmitting surface and the second light-reflecting surface do not affect each other.
[0007] In addition, the second light-transmitting surface of the first prism and the first light-blocking surface and the third light-transmitting surface form a first step part, the first step part is matched in shape with the second step part, alignment is facilitated, the step structure has high stability after splicing, and the two are not easy to separate, facilitating subsequent combination of the prisms for further polishing and processing. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 It is a structural schematic view of a combined prism of the background technology, and the broken line with continuous arrows in the figure represents the propagation direction of the incident light beam.
[0009] Figure 2 It is a structural schematic view of a second prism of the background technology.
[0010] Figure 3 It is a structural schematic view of a combined prism of the present application, and the broken line with continuous arrows in the figure represents the propagation direction of the incident light beam.
[0011] Figures 4-6 It is a structural exploded view of different angles of the present application. DETAILED DESCRIPTION
[0012] The present application will be further described below in combination with the drawings:
[0013] Referring to the accompanying Figures 3-6 A combined prism for an endoscope includes a first prism 10, a second prism 20, and a third prism 30, and the second prism 20 is arranged between the first prism 10 and the third prism 30.
[0014] One side of the first prism 10 is provided with a first light-transmitting surface 11, and the other side is provided with a first step part 101; the first step part 101 includes a second light-transmitting surface 12, a first light-blocking surface 14, and a third light-transmitting surface 13 connected in sequence, the second light-transmitting surface 12 and the third light-transmitting surface 13 are parallel, and the first light-blocking surface 14 is connected perpendicularly to the second light-transmitting surface 12 and the third light-transmitting surface 13.
[0015] The second prism 20 has a first reflective surface 21 on one side and a second stepped portion 201 on the other side. The second stepped portion 201 includes a fourth light-transmitting surface 22, a second light-shielding surface 24, and a second reflective surface 23 connected in sequence. The fourth light-transmitting surface 22 and the second reflective surface 23 are parallel, and the second light-shielding surface 24 is perpendicularly connected to the fourth light-transmitting surface 22 and the second reflective surface 23. The second prism 20 also has a fifth light-transmitting surface 25 connecting the first reflective surface 21 and the second reflective surface 23.
[0016] The first step portion 101 and the second step portion 201 are shaped and abut against each other, wherein the second light-transmitting surface 12 abuts against the fourth light-transmitting surface 22, the first light-shielding surface 14 abuts against the second light-shielding surface 24, and the third light-transmitting surface 13 abuts against the second reflective surface 23.
[0017] The third prism 30 is provided with a sixth light-transmitting surface 31; the sixth light-transmitting surface 31 and the first reflective surface 21 are shaped and close to each other.
[0018] like Figure 3 As shown, the first light-transmitting surface 11 is used to allow the light beam to enter the first prism 10, the second light-transmitting surface 12 is used to allow the light beam to exit from the first prism 10, the fourth light-transmitting surface 22 is used to allow the light beam exiting from the second light-transmitting surface 12 to enter the second prism 20, the first reflective surface 21 is used to reflect the light beam entering the second prism 20 to the second reflective surface 23, the second reflective surface 23 is used to reflect the light beam to the fifth light-transmitting surface 25, and the fifth light-transmitting surface is used to allow the light beam to exit from the second prism 20. That is, the light beam enters the combined prism from the first light-transmitting surface 11, passes through the second light-transmitting surface 12 and the fourth light-transmitting surface 22, reaches the first reflective surface 21, is reflected by the first reflective surface 21 to the second reflective surface 23, is then reflected again to the fifth light-transmitting surface 25, and exits from the fifth light-transmitting surface 25.
[0019] In this technical solution, the fourth light-transmitting surface 22 and the second reflective surface 23 of the second prism 20 are parallel, and the light transmission and reflection angles are consistent. The fourth light-transmitting surface 22 and the second reflective surface 23 are connected at intervals through the second light-shielding surface 24 to form a stepped second step portion 201, so that the fourth light-transmitting surface 22 and the second reflective surface 23 do not affect each other.
[0020] In addition, the second light-transmitting surface 12 of the first prism 10, together with the first light-blocking surface 14 and the third light-transmitting surface 13, forms the first step portion 101. The first step portion 101 and the second step portion 201 have matching shapes, which facilitates alignment. Moreover, the step structure has high stability after splicing, and the two are not easy to separate, which facilitates further grinding and processing of the subsequent assembled prism.
[0021] The first prism 10 is further provided with a seventh light-transmitting surface 15, and the third prism 30 is further provided with an eighth light-transmitting surface 32, the fifth light-transmitting surface, the seventh light-transmitting surface 15 and the eighth light-transmitting surface 32 are coplanar, and constitute the light-out surface of the combined prism.
[0022] The first reflecting surface 21 and the second reflecting surface 23 are coated with reflecting films.
[0023] The first light-transmitting surface 11, the second light-transmitting surface 12, the third light-transmitting surface 13, the fourth light-transmitting surface 22, the fifth light-transmitting surface 25, the sixth light-transmitting surface 31, the seventh light-transmitting surface 15 and the eighth light-transmitting surface 32 are polished bright surfaces, wherein the first light-transmitting surface 11, the second light-transmitting surface 12, the fourth light-transmitting surface 22 and the fifth light-transmitting surface 25 are coated with anti-reflection films to improve the light-transmitting rate.
[0024] The first light-blocking surface 14 and the second light-blocking surface 24 are coated with light-blocking inks to effectively separate the second light-transmitting surface 12 and the third light-transmitting surface 13, and the fourth light-transmitting surface 22 and the second reflecting surface 23, so as to avoid interference.
[0025] The first prism 10 and the second prism 20, and the second prism 20 and the third prism 30 are fixed by glue.
[0026] The first prism 10 is a five-prism with a stepped surface, the second prism 20 is a four-prism with a stepped surface, and the third prism 30 is a three-prism, and the initial state of the combined prism is a four-prism, and the subsequent prisms need to be polished into a circle.
[0027] The above preferred embodiments should be regarded as examples of the embodiments of the present application, and any technical deduction, replacement, improvement and the like made on the basis of the embodiments of the present application should be regarded as the protection scope of the present patent.
Claims
1.A combined prism for an endoscope, comprising a first prism, a second prism and a third prism, the second prism being arranged between the first prism and the third prism; characterized in that: one side of the first prism is provided with a first light-transmitting surface, and the other side is provided with a first stepped portion; the first stepped portion comprises a second light-transmitting surface, a first light-blocking surface and a third light-transmitting surface connected in sequence, the second light-transmitting surface and the third light-transmitting surface are parallel, and the first light-blocking surface is connected perpendicularly to the second light-transmitting surface and the third light-transmitting surface; one side of the second prism is provided with a first reflecting surface, and the other side is provided with a second stepped portion; the second stepped portion comprises a fourth light-transmitting surface, a second light-blocking surface and a second reflecting surface connected in sequence, the fourth light-transmitting surface and the second reflecting surface are parallel, and the second light-blocking surface is connected perpendicularly to the fourth light-transmitting surface and the second reflecting surface; the second prism is further provided with a fifth light-transmitting surface connecting the first reflecting surface and the second reflecting surface; the first stepped portion and the second stepped portion are in shape and abut against each other, wherein the second light-transmitting surface and the fourth light-transmitting surface abut against each other, the first light-blocking surface and the second light-blocking surface abut against each other, and the third light-transmitting surface and the second reflecting surface abut against each other; the third prism is provided with a sixth light-transmitting surface; the sixth light-transmitting surface and the first reflecting surface are in shape and abut against each other. 2.The combined prism for an endoscope according to claim 1, characterized in that: the first prism is further provided with a seventh light-transmitting surface, the third prism is further provided with an eighth light-transmitting surface, and the fifth light-transmitting surface, the seventh light-transmitting surface and the eighth light-transmitting surface are coplanar. 3.The combined prism for an endoscope according to claim 2, characterized in that: the first reflecting surface and the second reflecting surface are coated with a reflecting film. 4.The combined prism for an endoscope according to claim 2, characterized in that: the first light-transmitting surface, the second light-transmitting surface, the third light-transmitting surface, the fourth light-transmitting surface, the fifth light-transmitting surface, the sixth light-transmitting surface, the seventh light-transmitting surface and the eighth light-transmitting surface are polished bright surfaces. 5.The combined prism for an endoscope according to claim 4, characterized in that: the first light-transmitting surface, the second light-transmitting surface, the fourth light-transmitting surface and the fifth light-transmitting surface are coated with an anti-reflection film. 6.The combined prism for an endoscope according to claim 2, characterized in that: the first light-blocking surface and the second light-blocking surface are coated with light-blocking ink. 7.The combined prism for an endoscope according to any one of claims 1-6, characterized in that: the first prism and the second prism, and the second prism and the third prism are fixed by glue.