CN216434530U

CN216434530U - Endoscope polarization beam splitter

Info

Publication number: CN216434530U
Application number: CN202123178172.2U
Authority: CN
Inventors: 郭毅军; 刘剑
Original assignee: Chongqing Xishan Science and Technology Co Ltd
Current assignee: Chongqing Xishan Science and Technology Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-05-03
Anticipated expiration: 2031-12-16

Abstract

The utility model discloses an endoscope polarized light beam splitter, including first prism and second prism, first prism is half pentaprism prism, the second prism is trapezoidal prism, and the two glues each other, and the plane of splitting that is located the veneer is provided with and is used for dividing into the optical wavelength and divides into the optical wavelength and divide into 380nm ~ lambda and lambda ~ 700nm two wave bands and carry out the optical medium layer of selection; the lambda is any value within the range of 600-670 nm. In the application of the polarized light endoscope device, the light splitter of the utility model can be additionally arranged in the optical back focus of the optical adapter through the adaptation with the optical adapter; the system can be used for splitting light, selecting frequency of a spectrum, extracting a special spectrum and performing special spectrum polarization imaging; under the condition of blurring in the operation, the polarized light imaging can provide a clearer image, and the functions of penetrating blood, penetrating bone residues and the like are realized, so that the operation visual field in the operation can be kept continuously clear, and the safety and the effectiveness of the operation are greatly improved.

Description

Endoscope polarization beam splitter

Technical Field

The utility model relates to an endoscope technical field, concretely relates to endoscope device's optical device.

Background

The medical endoscope device is a medical electronic optical instrument which can be inserted into human body cavity and internal organ cavity to make direct observation, diagnosis and treatment, and is characterized by that it adopts optical lens with very small size to make optical imaging of intracavity object to be observed by means of miniature objective lens imaging system, then the optical imaging is sent to image processing main machine, and finally the observed image after image processing is outputted on the display screen for doctor to observe and diagnose.

Referring to fig. 1, the endoscope apparatus generally includes a light source, an endoscope, a camera, and a host. The optical system of the camera generally includes an optical adaptive lens, which is divided into a fixed focal length adapter (i.e., an optical fixed focus adapter) and a variable focal length adapter (i.e., an optical zoom adapter), and a mechanical structure supporting the adapters. After the eyepiece connecting module is connected with the eyepiece of the endoscope, the image information of the endoscope is transmitted to the optical fixed-focus adapter, imaged to the rear-end image sensor to acquire the image information, and amplified and displayed on the display.

The phenomenon of scattering of light is a phenomenon in which a part of light propagates in a direction deviated from the original direction when the light passes through an inhomogeneous medium, and the light deviated from the original direction is called scattered light. Scattered light can affect the image sharpness, causing blurring of the target and even failure of the target to detect. In clinical operations (such as orthopedic operations, urinary surgery operations, gynecological operations and the like) using an endoscope device, a surgical cavity is filled with physiological saline, blood, bone residues, soft tissue residues, stone particles and the like under a physiological saline medium, and the substances form an inhomogeneous medium, so reflected light of the medium can be scattered, and the imaging definition of the endoscope device is influenced. Whether the scattered light in the inhomogeneous medium can be effectively inhibited or not is particularly important for improving the field definition in the operation.

Disclosure of Invention

The utility model aims to provide an optical device which can improve the imaging performance of an endoscope device.

Accordingly, an embodiment of the present invention provides an endoscope polarization beam splitter, comprising a first prism and a second prism, wherein the first prism is a semi-pentagonal prism, and the second prism is a trapezoidal prism, which are glued to each other; the light splitting surface at the gluing part is provided with an optical medium layer for selecting two wave bands of 380 nm-lambda and lambda-700 nm of light wave wavelength, and the lambda is an arbitrary value in the range of 600 nm-670 nm.

The utility model discloses an in the embodiment, an arris face of half pentaprism prism with trapezoidal prism's big inclined plane veneer, trapezoidal prism's big bottom surface with half pentaprism's minimum arris face is in the coplanar.

In an embodiment of the present invention, the optical medium layer includes a multi-layer medium optical film.

The utility model discloses an in the embodiment, optical medium layer includes multilayer medium optical film for the realization falls into 380nm ~ 635nm and two wave bands of 635nm ~ 700nm to the light wave wavelength and carries out the optical characteristic who selects.

In one embodiment of the present invention, the multilayer medium optical film includes a high refractive index material film layer and a low refractive index material film layer, and the two are stacked in sequence.

In an embodiment of the present invention, the multi-layer dielectric optical film is a dichroic filter.

The utility model discloses an in the embodiment, high refracting index material rete and low refracting index material rete plate in proper order and locate on the first prism beam splitting face.

The utility model discloses an in the embodiment, high refracting index material rete and low refracting index material rete plate in proper order and locate on the beam splitting face of second prism.

In an embodiment of the present invention, the high refractive index material film layer is plated on the splitting surface of the first prism, and the low refractive index material film layer is plated on the splitting surface of the second prism; or the high-refractive-index material film layer is plated on the light splitting surface of the second prism, and the low-refractive-index material film layer is plated on the light splitting surface of the first prism.

In an embodiment of the present invention, the dichroic filter film is separately sandwiched between the first prism and the second prism.

In the application of a polarized light endoscope device, the optical splitter provided by the embodiment of the utility model is applied, and the optical splitter can be additionally arranged in the proper optical back focus of the optical adapter through the effective matching of the optical adapter and the optical splitter; the light splitter of the utility model can split light and select frequency of spectrum, extract special spectrum, and is used for special spectrum polarization imaging; under the condition that the working environment of the endoscope in the operation is complex and fuzzy, the polarized light imaging can provide clearer images, and the functions of blood penetration, bone residue penetration and the like are realized, so that the continuous and clear operation visual field in the operation can be kept, and the safety and the effectiveness of the operation are greatly improved.

Drawings

FIG. 1 is a schematic view of an endoscopic device of the prior art;

fig. 2 is a schematic structural diagram of an endoscope polarization beam splitter according to an embodiment of the present invention;

fig. 3 is a schematic partial structural view of an endoscope polarization beam splitter according to an embodiment of the present invention;

fig. 4 is a schematic partial structure view of an endoscope polarization beam splitter according to another embodiment of the present invention;

fig. 5 is a partial structural schematic view of an endoscope polarization beam splitter according to still another embodiment of the present invention;

fig. 6 is a schematic structural diagram of an endoscope polarized light splitter according to an embodiment of the present invention, which is used for a camera of an endoscope apparatus.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

In an embodiment of the present invention, please refer to fig. 2, the light splitter includes a first prism 1 and a second prism 2, the first prism 1 is a half-pentagonal prism, the cross-sectional shape of the first prism is half of that of a regular pentagonal prism, and the second prism 2 is a trapezoidal prism; after one edge surface of the semi-pentagonal prism is glued with the large inclined surface of the trapezoidal prism, the large bottom surface of the trapezoidal prism and the semi-edge surface of the semi-pentagonal prism are positioned on the same plane; the semi-prism surface of the semi-pentagonal prism is a prism surface with a half area left when the pentagonal prism is divided into two parts; the trapezoidal prism has two inclined planes, wherein the larger area is called the large inclined plane, and has two bottom planes, wherein the larger area is called the large bottom plane. The inclined plane at the bonding position of the optical adapter and the optical adapter, namely the light splitting plane, is provided with an optical medium layer for frequency selection of the light waves transmitted from the optical adapter, namely the selection of the wavelength of the light waves, the reflection of the light waves with the wavelength of 380 nm-lambda, the transmission of the light waves with the wavelength of lambda-700 nm, or the transmission of the light waves with the wavelength of 380 nm-lambda and the reflection of the light waves with the wavelength of lambda-700 nm; lambda is any value within the range of 600nm to 670 nm; light waves with wavelengths of 380nm to lambda are received by the white light image sensor 11, and light waves with wavelengths of lambda to 700nm are received by the polarized light image sensor 12. The positions of the white light image sensor 11 and the polarized light image sensor 12 are determined by the light splitter, namely the positions may be reversed according to the light splitting characteristics of the light splitter. The white light image sensor receives a common white light image, and the polarized light image sensor receives a polarized light image of a special spectrum.

In an embodiment of the present invention, please refer to fig. 3, and the light beam incident direction is overlapped in sequence through the low refractive index material film layer and the high refractive index material film layer at the splitting plane, so as to select the frequency of the light wave, i.e. select the wavelength of the light wave, and divide the light wave into two wave bands of 380-635 nm and 635-700 nm. Reflecting the light beam with the wavelength of 380-635 nm for common white light imaging; transmitting a light beam with the wavelength of 635-700 nm for polarized light imaging; respectively on the first image sensor 11 and the second image sensor 12.

In an embodiment of the present invention, please refer to fig. 4, and the light beam incident direction is overlapped in sequence through the high refractive index material film layer and the low refractive index material film layer at the splitting plane, the splitting mode of the splitter is the light reflection of wavelength 635-700 nm, and the light transmission of wavelength 380-635 nm is imaged on the corresponding image sensor respectively. The specific value of lambda is 635nm, on one hand, the light wave range of white light is fully covered, and the reduction degree and the imaging quality of white light imaging are ensured; on the other hand, the polarized light in a sufficient wavelength range can be acquired, and the quality and clinical reference value of the polarized light imaging are ensured.

In one embodiment, the multi-layer dielectric optical thin film directly adopts a discrete dichroic filter film, is positioned on the light splitting surface, and is clamped between the first prism and the second prism.

In an embodiment of the present invention, the optical medium layer is a multi-layer medium optical film, and the multi-layer medium optical film includes multiple layers of different refractive index materials, and generally, a high refractive index material film layer and a low refractive index material film layer are stacked in sequence.

In a more specific optional embodiment, the high refractive index material film layer and the low refractive index material film layer are sequentially plated on the prism splitting surface of the first prism, that is, the prism surface of the first prism at the prism bonding position.

Or the high refractive index material film layer and the low refractive index material film layer are sequentially plated on the light splitting surface of the second prism, namely the inclined surface of the second prism at the prism gluing position.

Or the high-refractive-index material film layer is plated on the light splitting surface of the first prism, and the low-refractive-index material film layer is plated on the light splitting surface of the second prism.

Or the high-refractive-index material film layer is plated on the light splitting surface of the second prism, and the low-refractive-index material film layer is plated on the light splitting surface of the first prism.

Please refer to fig. 6, an embodiment of the present invention is applied to a camera optical system of a polarized light endoscope apparatus, the optical system includes an optical fixed focus adapter and the optical splitter of an embodiment of the present invention, the optical adapter employs a focal length 27-35 mm, a total length 30-40 mm (the total length is a distance from a front protection plate to a rear protection plate), for adapting the optical splitter, an inverse distance ratio structure is employed, a ratio of a working distance L (i.e. a distance from the rear protection plate to an image plane of an image sensor) to a focal length f is an inverse distance ratio, in this example, the inverse distance ratio is 1-1.5, an incident angle CRA of a principal ray is less than 15 °, and the optical splitter is well matched with the image sensor.

In the application of the polarized light endoscope device, the ratio of the working distance L (namely the distance between the rear protection plate and the image surface of the image sensor) to the focal length f is the inverse-far ratio, and the inverse-far ratio is 1-1.5 through the design of the large inverse-far ratio of the optical adapter, so that the light splitter of the utility model can be added in the proper optical back focus provided by the optical adapter; the light can be split, the frequency of the spectrum is selected, and a special spectrum is extracted and used for polarization imaging of the special spectrum; under the condition of blurring in the operation, the polarized light imaging can provide a clearer image, and the functions of blood penetration, bone residue penetration and the like are realized, so that the operation visual field in the operation can be kept continuously clear, and the safety and the effectiveness of the operation are greatly improved.

In the above embodiments of the present invention, the white light image sensor or the polarized light image sensor may adopt an image sensor of the prior art, such as a CCD image sensor or a CMOS image sensor. The lenses can be made of materials in the prior art, such as glass, crystal or organic glass. The symbol "-" represents the value range of a certain parameter, and the value range comprises two endpoint values; such as: a lambda of 600nm to 670nm means that the lambda takes any value within the range of 600nm to 670nm, including both 600nm and 670nm end values.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical personnel in the technical field of the utility model, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replace.

Claims

1. An endoscopic polarizing beam splitter, comprising: the prism comprises a first prism and a second prism, wherein the first prism is a semi-pentagonal prism, the second prism is a trapezoidal prism, and the first prism and the second prism are glued with each other; the light splitting surface at the gluing part is provided with an optical medium layer for selecting the light wavelength divided into two wave bands of 380 nm-lambda and lambda-700 nm; the lambda is any value within the range of 600-670 nm.

2. The endoscopic polarizing beam splitter as defined in claim 1 wherein: one edge surface of the semi-pentagonal prism is glued with the large inclined surface of the trapezoidal prism, and the large bottom surface of the trapezoidal prism and the minimum edge surface of the semi-pentagonal prism are positioned on the same plane.

3. The endoscopic polarizing beam splitter as defined in claim 2 wherein: the optical media layer includes a multilayer media optical film.

4. The endoscopic polarizing beam splitter as defined in claim 2 wherein the optical media layer comprises a multilayer dielectric optical film for achieving optical properties for selective wavelength division of light into two bands of 380nm to 635nm and 635nm to 700 nm.

5. The endoscopic polarizing beam splitter as defined in claim 3 or 4 wherein the multilayer dielectric optical film comprises a high refractive index material film layer and a low refractive index material film layer, which are laminated in this order.

6. The endoscopic polarizing beam splitter as defined in claim 3 or 4 wherein the multi-layer dielectric optical film is a dichroic filter.

7. The endoscopic polarizing beam splitter according to claim 5 wherein the high index of refraction material film and the low index of refraction material film are sequentially plated onto the first prism splitting surface.

8. The endoscopic polarizing beam splitter as defined in claim 5 wherein the high refractive index material film layer and the low refractive index material film layer are sequentially plated on the splitting surface of the second prism.

9. The endoscope polarizing beamsplitter of claim 5, wherein the high index of refraction material film is plated on the splitting surface of the first prism, and the low index of refraction material film is plated on the splitting surface of the second prism; or the high-refractive-index material film layer is plated on the light splitting surface of the second prism, and the low-refractive-index material film layer is plated on the light splitting surface of the first prism.

10. The endoscope polarizing beamsplitter of claim 6 wherein the dichroic filter film is discretely sandwiched between the first prism and the second prism.