CN117257214A - Light guide device, lighting assembly and endoscope system - Google Patents

Light guide device, lighting assembly and endoscope system Download PDF

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Publication number
CN117257214A
CN117257214A CN202210662699.2A CN202210662699A CN117257214A CN 117257214 A CN117257214 A CN 117257214A CN 202210662699 A CN202210662699 A CN 202210662699A CN 117257214 A CN117257214 A CN 117257214A
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CN
China
Prior art keywords
light
illumination
fiber bundle
light guide
guide device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210662699.2A
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Chinese (zh)
Inventor
莫庆艳
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Sonoscape Medical Corp
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Sonoscape Medical Corp
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Publication date
Application filed by Sonoscape Medical Corp filed Critical Sonoscape Medical Corp
Priority to CN202210662699.2A priority Critical patent/CN117257214A/en
Publication of CN117257214A publication Critical patent/CN117257214A/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/07—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements using light-conductive means, e.g. optical fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0638—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements providing two or more wavelengths
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0669—Endoscope light sources at proximal end of an endoscope
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0684—Endoscope light sources using light emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2461—Illumination
    • G02B23/2469—Illumination using optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0008—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted at the end of the fibre

Abstract

The invention discloses a light guide device, which changes the transmission direction of at least part of light rays of an illumination light beam to enable the at least part of light rays of the illumination light beam to be redistributed at an emergent end, so that when an incident light spot of the illumination light beam is smaller than the end face of the incident end of the light guide device, the form of the emergent light spot of the illumination light beam corresponds to that of the emergent end of the light guide device, the influence of the form of the incident light spot of the illumination light beam can be avoided, and the emergent light spot corresponding to the shape and the size of the emergent end can be always emergent. Furthermore, when the light guide device provided by the invention is used for transmitting multicolor illumination light beams, even if various color light spots incident on the incident end of the light guide device are not completely overlapped, illumination light spots with uniform color mixing can be output, so that the problem of color cast can be corrected. The invention also discloses an illumination assembly and an endoscope system.

Description

Light guide device, lighting assembly and endoscope system
Technical Field
The present invention relates to the technical field of endoscopes, and in particular, to a light guide device, a lighting assembly, and an endoscope system.
Background
The endoscope is an inspection device widely applied in the medical field, the endoscope can enter the cavity through a duct or a small incision made by operation, the condition of relevant parts in the body can be directly peeped, and a doctor can observe the pathological changes in the cavity and diagnose diseases by means of the endoscope.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional endoscope system, which at least includes a light source 10 and a scope. The light source 10 may be a multi-wavelength light source for outputting multi-color illumination light to meet illumination requirements of various imaging modes. The scope body is used for performing an endoscopic examination, and includes a light guide portion 11, an operation portion 14, and an insertion portion 13 connected in this order, and a light guide optical fiber 12 is inserted into the light guide portion 11, the operation portion 14, and the insertion portion 13. After the light guide 11 is connected to the light source 10, illumination light output from the light source 10 is coupled into the light guide fiber 12, transmitted to the distal end of the insertion portion 13 through the light guide fiber 12, and emitted to illuminate the cavity, so that the condition in the cavity can be observed through the endoscope.
In practical application, because the light guide fiber 12 disposed in the lens body is longer, the light energy loss is more during the light transmission process, so in order to ensure the light output of the lens body, the light source 10 needs to use a high-power light emitting chip, which results in large overall size of the light source 10, development of a single light source, and higher cost; in addition, the light source 10 outputs a large amount of light, and the coupling loss generated at the portion connected to the mirror body increases accordingly, which may cause the light guide portion 11 to have a high temperature and may cause a burn to the human body.
In order to solve the above-described problems of the endoscope, a method of incorporating a light source into a scope, for example, a method of disposing the light source on an operation portion of the scope, has been proposed. The light emitting chip with small volume and small light emitting area can only be selected to provide illumination light beams of various wave bands.
However, during development, the present inventors found that: when the multi-wavelength light source with small volume and small light emitting area is adopted, the problem of color cast of the illumination light spot emitted by the mirror body is easy to occur, and then the imaging effect is poor.
Disclosure of Invention
The invention aims to provide a light guide device, which can avoid the influence of incident light spots of illumination light beams, always emit emergent light spots corresponding to the shape and the size of an emergent end, and further output illumination light spots with uniform color mixing and correct the problem of color cast even if the incident light spots of various colors incident on the light guide device are not completely overlapped. The invention also provides an illumination assembly and an endoscope system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a light guide device for guiding out an illumination beam emitted from a light source, the light guide device having an incident end and an emitting end, the incident end being configured to be coupled to the light source to receive the illumination beam, the illumination beam being transmitted by the light guide device and emitted from the emitting end;
the light guide device is further configured to change a transmission direction of at least part of light in the illumination beam, so that the at least part of light is redistributed at the exit end, and when an incident light spot of the illumination beam is smaller than an end face of the incident end, a shape of the exit light spot of the illumination beam corresponds to a shape of the exit end.
Optionally, the light guiding device includes:
an optical fiber bundle for transmitting the illumination beam;
and the light mixing component is connected with the optical fiber bundle and is used for changing the transmission direction of at least part of light rays of the illumination light beam.
Optionally, the light mixing component comprises a light homogenizing rod with a cavity inside, and the light homogenizing rod is used for making the illumination light beam reflected for multiple times.
Optionally, the light mixing component comprises a birefringent light homogenizing rod, and the birefringent light homogenizing rod is used for enabling the illumination light beam to generate multiple total reflections.
Optionally, the light mixing component includes a light transmissive lens for scattering the illumination beam.
Optionally, the light mixing component is disposed on an optical path between the light source and the optical fiber bundle, or/and the light mixing component is disposed on an optical path of the optical fiber bundle.
Optionally, the optical fiber bundle is a hybrid fiber bundle, the hybrid fiber bundle includes a plurality of optical fibers, and an arrangement position of an exit end of at least some of the plurality of optical fibers at the exit end of the hybrid fiber bundle is different from an arrangement position of an incident end of the present optical fiber at the incident end of the hybrid fiber bundle.
Optionally, the light guiding device includes a hybrid fiber bundle, the hybrid fiber bundle includes a plurality of optical fibers, and an arrangement position of an exit end of at least some of the plurality of optical fibers at the exit end of the hybrid fiber bundle is different from an arrangement position of an incident end of the present optical fiber at the incident end of the hybrid fiber bundle.
Optionally, the at least part of the optical fibers are optical fibers located at the outer periphery of the hybrid fiber bundle.
Optionally, an arrangement position of the exit end of each optical fiber in the mixed fiber bundle at the exit end of the mixed fiber bundle is different from an arrangement position of the incident end of the present optical fiber at the incident end of the mixed fiber bundle.
A lighting assembly comprising a light source and a light guiding device as described above.
Optionally, the light source is a multi-wavelength light source, and is configured to emit at least two illumination light beams with different colors to the light guide device, where the incident light spots of the illumination light beams with different colors to the light guide device do not completely overlap.
An endoscope system, comprising: the light source is arranged in the mirror body, and the light guide device penetrates through the mirror body and extends to the far end of the mirror body.
Optionally, the light source is disposed at an operation portion of the mirror body.
According to the technical scheme, the beneficial effects of the invention are as follows:
according to the light guide device provided by the invention, at least part of light rays of the illumination light beam are redistributed at the emergent end by changing the transmission direction of at least part of light rays of the illumination light beam, so that when the incident light spot of the illumination light beam is smaller than the end face of the incident end of the light guide device, the form of the emergent light spot of the illumination light beam corresponds to that of the emergent end of the light guide device, the influence of the form of the incident light spot of the illumination light beam can be avoided, and the emergent light spot corresponding to the shape and the size of the emergent end can be always emergent. Furthermore, when the light guide device provided by the invention is used for transmitting multicolor illumination light beams, even if various color light spots incident on the incident end of the light guide device are not completely overlapped, illumination light spots with uniform color mixing can be output, so that the problem of color cast can be corrected.
The lighting assembly and the endoscope system provided by the invention both comprise the light guide device, so that the beneficial effects can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art endoscope system;
FIG. 2 (a) is a schematic diagram showing the position distribution of each color spot in an illumination beam emitted by a light source according to an embodiment of the present invention;
FIG. 2 (b) is a schematic diagram showing the relative positions of the light spots of each color in the illumination beam emitted by the light source and the incident end face of the light guiding device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an arrangement of a light guide device and a light source according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating an arrangement of a light guiding device and a light source according to another embodiment of the present invention;
FIG. 5 (a) is a schematic diagram of a conventional optical fiber bundle according to an embodiment of the present invention;
FIG. 5 (b) is a schematic diagram of a hybrid fiber bundle according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an illumination assembly according to an embodiment of the present invention;
fig. 7 is a schematic view of an endoscope system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Currently, in order to reduce light loss and use cost of an endoscope, there is proposed a related art in which a light source is built into a scope, for example, the light source is provided on an operation portion of the scope. The light emitting chip (for example, LED chip) with small volume and small light emitting area can only be selected to provide illumination light beams of each band (i.e., illumination light beams of each color), and then the illumination light beams corresponding to the target light emitting spectrum are modulated by beam combination. However, during development, the present inventors found that: when the multi-wavelength light source is applied, the color cast problem of the illumination light spot emitted by the mirror body is easy to occur, and the imaging effect is poor.
The reason for this is mainly because: the multi-wavelength light source generally combines two or more colors of illumination light into a beam of combined light through a preset number of dichroic filters and emits the combined light. Among the emitted combined light, the spots of the illumination light of the respective colors are substantially hardly completely overlapped. For example, taking the formation of white light by combining red light, green light and blue light as an example, as shown in fig. 2 (a), a schematic diagram of the position distribution of each color spot in an illumination beam emitted by a light source in an embodiment of the present invention is shown, where the red light spot, the green light spot and the blue light spot are offset in position and cannot be completely overlapped, and only the overlapped parts of the three spots can be mixed to form a white light spot.
When the light source adopts a light emitting chip with a large light emitting area, the emergent light spot area is large, and correspondingly, the overlapping area of the light spots with different colors is large, so that when the light source and the light guide device are coupled, the illumination light with uniform color mixing can be output from the light guide device as long as the light rays entering the light guide device are all the light rays corresponding to the overlapping area of the light spots with different colors.
However, when a light emitting chip having a small light emitting area is used as the light source, the area of the emitted light spots is small, and accordingly, the overlapping area of the light spots of each color is small, and in this case, as shown in fig. 2 (b), the area of the end face of the incident end of the light guide is generally larger than the overlapping area of the light spots of each color, and further, the light spots of each color incident on the incident end of the light guide are not completely overlapped, because the area (aperture) of the end face of the incident end of the light guide is generally fixed.
Further, since the incident light spot and the emergent light spot of the conventional light guide device are substantially the same, the light spots of each color in the illumination light beam led out by the conventional light guide device are not completely overlapped, so that white light is formed only in the area (usually the central area) where the light spots of each color overlap, and other undesired colors are displayed in the area (usually the peripheral area) where the light spots of each color do not overlap, that is, color deviation (color shift) occurs, and the imaging effect is poor.
In view of the above, an embodiment of the present invention provides a light guide device, and an illumination assembly and an endoscope system including the light guide device to solve the above-mentioned color cast problem.
Specifically, the light guide device provided by the embodiment of the invention can be used for transmitting the illumination light beam emitted by the light source, and also can be used for changing the transmission direction of at least part of light rays of the illumination light beam, so that at least part of light rays of the illumination light beam are redistributed at the emitting end, when the incident light spot of the illumination light beam is smaller than the end face of the incident end of the light guide device, the shape of the emitting light spot of the illumination light beam (namely, the illumination light spot emitted from the emitting end of the light guide device) corresponds to the shape of the emitting end, the influence of the shape of the incident light spot of the illumination light beam can be avoided, and the emitting light spot corresponding to the shape (shape and size) of the emitting end is always emitted.
Thus, when the light guide device provided by the embodiment of the invention is used for transmitting multicolor illumination light beams, the form of each color light spot emitted by the light guide device is irrelevant to the form of each corresponding color incident light spot and always corresponds to the form of the emergent end, so that the forms of each color light spot emitted by the light guide device are consistent and are completely overlapped, the colors of the formed mixed light spots are uniform, and even if the light spots of each color incident on the incident end of the light guide device are not completely overlapped, the illumination light spots with uniform color mixing can be output, and the problem of color cast can be corrected.
The light guide device, the illumination assembly and the endoscope system provided by the embodiment of the invention are described in detail below with reference to the accompanying drawings.
The present embodiment provides a light guiding device for guiding out an illumination beam emitted from a light source, and fig. 3 may be referred to, and fig. 3 is a schematic layout diagram of the light guiding device and the light source provided in an embodiment, as shown in the drawing, the light guiding device 101 has an incident end 102 and an emitting end 103, the incident end 102 is configured to be coupled with the light source 100 so as to receive the illumination beam emitted from the light source 100, and the illumination beam is transmitted by the light guiding device 101 and then emitted from the emitting end 103; the light guiding device 101 is further configured to change a transmission direction of at least part of light in the illumination beam, so that the at least part of light is redistributed at the exit end 103, so that when an incident light spot of the illumination beam is smaller than an end face of the entrance end 103, a shape of the exit light spot of the illumination beam corresponds to a shape of the exit end 103.
The change in the transmission direction of the light refers to that the light deflects relative to the axial direction of the light guiding device 101, so that the incident position and the emergent position of the light in the light guiding device 101 deviate in the radial direction.
The incident spot of the illumination beam is a spot where the illumination beam is incident on the incident end 102 of the light guide 101 and enters the inside of the light guide 101. The emission light spot of the illumination light beam is a light spot formed when the illumination light beam is emitted from the emission end 103 of the light guide 101.
The shape of the outgoing spot of the illumination beam corresponds to the shape of the outgoing end 103, and at least includes that the shape of the outgoing spot of the illumination beam is identical to the end face shape of the outgoing end 103. Specifically, the shape of the outgoing spot of the illumination beam may correspond to the shape of the outgoing end 103, and the shape and the size of the outgoing spot of the illumination beam may be the same as the shape and the size of the end face of the outgoing end 103. Alternatively, the shape of the outgoing spot of the illumination beam may correspond to the shape of the outgoing end 103, and the shape of the outgoing spot of the illumination beam may be the same as the shape of the end surface of the outgoing end 103, but the outgoing spot of the illumination beam may be an enlarged spot or a reduced spot, depending on the spot shape defined by the outgoing end 103.
The light guiding device 101 is configured to change a transmission direction of at least part of light in the illumination beam, so that at least part of the light is redistributed at the emitting end 103, and based on this, the light quantity distribution of the illumination spot emitted by the light guiding device 101 can also be controlled by the light guiding device 101. For example, in practical applications, the light guide device 101 may be further configured to perform a corresponding optical design, so that when the incident light spot of the illumination beam is smaller than the end face of the incident end of the light guide device 101, no matter where the incident light spot of the illumination beam is located at the input end 102 of the light guide device 101, the transmission direction of part or all of the light rays of the illumination beam may be changed, so that the illumination light spot emitted by the light guide device 101 meets a preset light distribution requirement. Therefore, the light guide device can not only improve the color cast problem of the emergent illumination light beam, but also improve the illumination uniformity of the emergent illumination light beam. In this embodiment, the preset light quantity distribution requirement is not limited, for example, gaussian distribution; or, the requirement of uniform light quantity distribution in practical application is met.
Alternatively, as an alternative embodiment, the light guide 101 may include: an optical fiber bundle for transmitting the illumination beam; and the light mixing component is connected with the optical fiber bundle and is used for changing the transmission direction of at least part of light rays of the illumination light beam. In the present embodiment, the structure of the light mixing member or the optical principle for realizing the change of the transmission direction of at least part of the light of the illumination light beam is not limited as long as the change of the transmission direction of at least part of the light of the illumination light beam can be realized.
Alternatively, the light mixing component may include a light homogenizing rod with a cavity inside, for reflecting the illumination beam multiple times. The illumination beam is reflected for multiple times in the cavity of the light homogenizing rod, so that the transmission direction of at least part of light rays of the illumination beam is changed, a virtual light source image is formed by each reflection, a two-dimensional virtual light source image matrix is formed by multiple reflections, and at least part of light rays of the illumination beam are redistributed after passing through the light homogenizing rod. Alternatively, the cavity of the light bar may be polygonal such that multiple reflections of the illumination beam occur within the cavity.
Alternatively, the light mixing means may comprise a birefringent light rod for total reflection of said illumination beam a plurality of times. The double-refraction light homogenizing rod comprises a first refraction layer and a second refraction layer, the refraction indexes of the first refraction layer and the second refraction layer are different, total reflection can occur when an illumination beam is incident to the interface of the first refraction layer and the second refraction layer, multiple total reflections occur when the illumination beam passes through the double-refraction light homogenizing rod, and at least part of light rays of the illumination beam are redistributed.
Optionally, the light mixing means may comprise a light transmissive lens for scattering said illumination beam such that at least part of the light of the illumination beam is redistributed after passing through the light transmissive lens. Optionally, the light-transmitting lens may be an optical medium lens with at least one optical surface frosted, but is not limited thereto, and the light-transmitting lens may be in other forms, which are all within the scope of the present invention.
It should be noted that, the above embodiments of the light mixing component are only used to illustrate the manner in which the light mixing component changes the transmission direction of at least part of the light beam of the illumination beam, and are not limited to the light mixing component in the present application, and in other embodiments, the light mixing component may also adopt other structures or implement changing the transmission direction of at least part of the light beam of the illumination beam based on other optical principles so that at least part of the light beam of the illumination beam is redistributed at the exit end, which is also within the scope of the present invention.
Alternatively, a light mixing element may be arranged in the light path between the light source and the optical fibre bundle, such that the illumination beam passes through the light mixing element before entering the optical fibre bundle. Alternatively, the light mixing member may be disposed on the light emitting path of the optical fiber bundle. The illumination beam is emitted from the optical fiber bundle and then passes through the light mixing member. Alternatively, a light mixing member may be provided on the optical path between the light source and the optical fiber bundle, and a light mixing member may also be provided on the light exit path of the optical fiber bundle, such that the illumination light beam passes through the light mixing member before entering the optical fiber bundle and passes through the light mixing member after exiting the optical fiber bundle. The light mixing component arranged on the light path between the light source and the optical fiber bundle and the light mixing component arranged on the light emitting light path of the optical fiber bundle can be the same or different. Referring to fig. 4, fig. 4 is a schematic layout diagram of a light guiding device and a light source according to another embodiment, as shown in the fig. 4, the light guiding device 101 includes an optical fiber bundle 104 and a light mixing component 105, the light mixing component 105 is disposed between the light source 100 and the optical fiber bundle 104, and an illumination beam emitted by the light source 100 passes through the light mixing component 105 and then is incident on an end face of the optical fiber bundle 104 coupled to the light mixing component 105.
Further preferably, the optical fiber bundle is a hybrid optical fiber bundle, the hybrid optical fiber bundle includes a plurality of optical fibers, and an arrangement position of an exit end of at least some of the plurality of optical fibers at the exit end of the hybrid optical fiber bundle is different from an arrangement position of an incident end of the present optical fiber at the incident end of the hybrid optical fiber bundle. Then, the illumination beam enters the optical fiber bundle from the incident end of the optical fiber bundle, and each part of light is transmitted along the optical fiber bundle, and since the arrangement position of the exit end of at least part of the optical fibers of the optical fiber bundle at the exit end of the optical fiber bundle is different from the arrangement position of the incident end of the optical fiber at the incident end of the optical fiber bundle, the distribution of at least part of light of the illumination beam exiting from the exit end of the optical fiber bundle is changed compared with that before the illumination beam enters the optical fiber bundle, so that the influence of the form of the incident light spot of the illumination beam can be further avoided, and the exit light spot and the incident light spot of the light guide device 101 are different.
Alternatively, as yet another alternative embodiment, the light guiding device 101 includes a hybrid fiber bundle, where the hybrid fiber bundle includes a plurality of optical fibers, and an arrangement position of an exit end of at least some of the plurality of optical fibers at the exit end of the hybrid fiber bundle is different from an arrangement position of an entrance end of the present optical fiber at the entrance end of the hybrid fiber bundle. Then, the illumination light beam enters the optical fiber bundle from the incident end of the mixed-woven optical fiber bundle, and each part of light is transmitted along the optical fiber bundle, and since the arrangement position of the emitting end of at least part of the optical fibers of the mixed-woven optical fiber bundle at the emitting end of the mixed-woven optical fiber bundle is different from the arrangement position of the incident end of the optical fibers at the incident end of the mixed-woven optical fiber bundle, the distribution of at least part of light of the illumination light beam emitted from the emitting end of the mixed-woven optical fiber bundle is changed compared with the distribution of at least part of light of the illumination light beam before the illumination light beam enters the optical fiber bundle, so that at least part of light of the illumination light beam is redistributed at the emitting end of the light guiding device 101.
In this embodiment, the changing manner of the arrangement positions of the optical fibers of the hybrid fiber bundle at the exit end and the entrance end is not limited, the number of the optical fibers of the hybrid fiber bundle with the arrangement positions of the optical fibers at the exit end and the entrance end being changed is not limited, and in practical application, the arrangement may be set according to the incident light spot condition before the illumination light beam enters the optical fiber bundle and the requirement for the illumination light spot output by the light guiding device 101. For example, in the case of each color spot in the illumination light beam emitted from the light source shown in fig. 2 (a), the red light spot, the green light spot, and the blue light spot are not completely overlapped, and the overlapping area of each color spot is the center area, and the light spots of each color are not overlapped in the peripheral area. According to the light spot situation, at least the optical fibers at the periphery of the mixed-woven optical fiber bundle are arranged at different positions from the arrangement positions of the incident ends of the optical fibers, so that after the illumination light beams are transmitted through the mixed-woven optical fiber bundle, at least the light rays in the peripheral area of the illumination light beams are redistributed, and the illumination light spots with uniform mixed colors can be output, so that the problem of color cast can be corrected.
Exemplary reference may be made to fig. 5 (a) and fig. 5 (b), where fig. 5 (a) is a schematic diagram of a conventional optical fiber bundle provided by an embodiment, fig. 5 (b) is a schematic diagram of a hybrid optical fiber bundle provided by an embodiment, and as shown in fig. 5 (a), the arrangement positions of the two ends of each optical fiber of the optical fiber bundle are the same, and in the hybrid optical fiber bundle shown in fig. 5 (b), the arrangement positions of the outgoing end and the incoming end of the optical fiber at the periphery of the optical fiber bundle are changed.
Preferably, in order to improve the illumination uniformity of the outgoing light spot, the arrangement position of the outgoing end of each optical fiber in the mixed-woven optical fiber bundle at the outgoing end of the mixed-woven optical fiber bundle is different from the arrangement position of the incoming end of the optical fiber at the incoming end of the mixed-woven optical fiber bundle. That is, the arrangement position of the outgoing end and the arrangement position of the incoming end of each optical fiber of the mixed-woven optical fiber bundle are different, and the optical fiber bundle adopts a completely mixed-woven mode, so that each part of light is redistributed after the illumination light beam is transmitted through the mixed-woven optical fiber bundle.
The embodiment also provides a lighting assembly comprising a light source and a light guiding device as described above.
In the lighting assembly of this embodiment, the light guide device is used to change the transmission direction of at least part of the light of the lighting beam, so that at least part of the light of the lighting beam is redistributed at the exit end, when the incident light spot of the lighting beam is smaller than the end face of the incident end of the light guide device, the shape of the exit light spot of the lighting beam corresponds to the shape of the exit end of the light guide device, so that the influence of the shape of the incident light spot of the lighting beam can be avoided, and the exit light spot corresponding to the shape and size of the exit end can be always emitted. Furthermore, even if the light spots of each color emitted by the light source are not completely overlapped, the illumination light spots with uniform color mixing can be output, so that the problem of color cast can be corrected.
Preferably, the light source is a multi-wavelength light source, and is configured to emit at least two illumination light beams of colors to the light guide device, and the illumination light beams of at least two colors are combined into an emission light beam of the light source. Preferably, the light output amounts of the respective illumination light beams of the at least two color illumination light beams are adjustable. By adjusting the light output of each illumination beam of the illumination beams with at least two colors and combining the adjusting function of the light guide device in the illumination assembly on the light distribution of the illumination beams, the optical parameters such as the color temperature, the color rendering index, the color coordinates and the like of the illumination beams emitted by the illumination assembly can be adjusted. In practical applications, the light output of each color light beam can be adjusted by adjusting the driving current or the driving voltage of the light emitting chip corresponding to each color light beam. Wherein the incident spots of the illumination beam of each color to the light guide may not completely overlap.
In the present embodiment, the structure of the light source is not limited, and a desired illumination beam may be emitted. The light source may include at least two kinds of light emitting chips, and the outgoing light beams of the various kinds of light emitting chips are combined into the outgoing light beam of the light source. Referring to fig. 6, fig. 6 is a schematic structural diagram of an illumination assembly according to an embodiment, and as shown in the drawing, a light source 100 includes a first light emitting chip 106, a second light emitting chip 107, a third light emitting chip 108, a first light combining element 109 and a second light combining element 110. The light emitted from the first light emitting chip 106 and the light emitted from the second light emitting chip 107 are respectively incident on the first light combining element 109, and the first light combining element 109 is configured to combine the light emitted from the first light emitting chip 106 and the light emitted from the second light emitting chip 107 and emit the combined light. The light emitted from the first light combining element 109 and the light emitted from the third light emitting chip 108 are respectively incident on the second light combining element 110, and the second light combining element 110 is configured to combine the light emitted from the first light combining element 109 and the light emitted from the third light emitting chip 108 and emit the combined light.
As shown in fig. 6, the light source may further include a first lens group 111 disposed on the light emitting path of the first light emitting chip 106, for collimating the light emitted from the first light emitting chip 106. The second lens group 112 is disposed on the light-emitting path of the second light-emitting chip 107, and is used for collimating the light emitted by the second light-emitting chip 107. The lens further includes a third lens group 113 disposed on an outgoing light path of the third light emitting chip 108, for collimating outgoing light of the third light emitting chip 108. The lens assembly further includes a fourth lens assembly 114 disposed on the light-emitting path of the second light-combining element 110, for converging the light emitted from the second light-combining element 110.
It should be understood that the light source structure shown in fig. 6 is only an alternative embodiment, and is not limited to the structure of the light source in the present invention, and other structures may be adopted for the light source in other embodiments of the present invention, which are all within the scope of the present invention.
The present embodiment also provides an endoscope system including: the light source is arranged in the mirror body, and the light guide device penetrates through the mirror body and extends to the far end of the mirror body.
In the illumination assembly applied to the endoscope system of the embodiment, the light guide device changes the transmission direction of at least part of light rays of the illumination beam, so that at least part of light rays of the illumination beam are redistributed at the emitting end, when the incident light spot of the illumination beam is smaller than the end face of the incident end of the light guide device, the shape of the emitting light spot of the illumination beam corresponds to the shape of the emitting end of the light guide device, the influence of the shape of the incident light spot of the illumination beam can be avoided, and the emitting light spot corresponding to the shape and the size of the emitting end can be always emitted. Furthermore, even if the light spots of each color emitted by the light source are not completely overlapped, the illumination light spots with uniform color mixing can be output, so that the problem of color cast can be corrected.
The endoscope system of the embodiment is provided with the light source on the mirror body, so that the propagation distance of the emergent light of the light source can be reduced, and the light loss is reduced. Optionally, the light source may be disposed at an operation portion of the mirror body. In this embodiment, the specific form of the light source disposed on the mirror body is not limited. Referring to fig. 7 for exemplary purposes, fig. 7 is a schematic diagram of an endoscope system according to an embodiment, where the endoscope system includes a light source 200, a light guide 201, and a mirror body, and the mirror body includes an operation portion 202 and an insertion portion 203, and the light source 200 is disposed on the operation portion 202. One end of the light guide 201 is connected to the light source 200, and the light guide 201 extends along the mirror body to the distal end of the insertion portion 203, and the outgoing light of the light source 200 propagates through the light guide bundle 201 and is emitted from the distal end of the insertion portion 203.
The light guide device, the lighting assembly and the endoscope system provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (14)

1. The light guide device is used for guiding out an illumination light beam emitted by a light source and is characterized by comprising an incident end and an emitting end, wherein the incident end is used for being coupled with the light source so as to receive the illumination light beam, and the illumination light beam is emitted from the emitting end after being transmitted by the light guide device;
the light guide device is further configured to change a transmission direction of at least part of light in the illumination beam, so that the at least part of light is redistributed at the exit end, and when an incident light spot of the illumination beam is smaller than an end face of the incident end, a shape of the exit light spot of the illumination beam corresponds to a shape of the exit end.
2. A light guide as recited in claim 1, wherein said light guide comprises:
an optical fiber bundle for transmitting the illumination beam;
and the light mixing component is connected with the optical fiber bundle and is used for changing the transmission direction of at least part of light rays of the illumination light beam.
3. A light guide as recited in claim 2, wherein the light mixing element comprises a light rod having a cavity therein for reflecting the illumination light beam a plurality of times.
4. A light guide as recited in claim 2, wherein the light mixing element comprises a birefringent light rod for causing multiple total reflections of the illumination beam.
5. A light guide as recited in claim 2, wherein the light mixing element comprises a light transmissive lens for diffusing the illumination light beam.
6. A light guide device according to any one of claims 2 to 5, wherein the light mixing member is provided on an optical path between the light source and the optical fiber bundle, or/and the light mixing member is provided on an outgoing optical path of the optical fiber bundle.
7. The light guide device of claim 6, wherein the optical fiber bundle is a hybrid fiber bundle, the hybrid fiber bundle comprises a plurality of optical fibers, and an arrangement position of an exit end of at least some of the plurality of optical fibers at the exit end of the hybrid fiber bundle is different from an arrangement position of an entrance end of the present optical fiber at the entrance end of the hybrid fiber bundle.
8. The light guide device according to claim 1, wherein the light guide device comprises a mixed fiber bundle including a plurality of optical fibers, and wherein an arrangement position of an exit end of at least some of the plurality of optical fibers at an exit end of the mixed fiber bundle is different from an arrangement position of an entrance end of the present optical fiber at an entrance end of the mixed fiber bundle.
9. The light guide of claim 8, wherein the at least some optical fibers are optical fibers located at an outer periphery of the hybrid fiber bundle.
10. The light guide device according to claim 8, wherein an arrangement position of an exit end of each optical fiber in the mixed fiber bundle at an exit end of the mixed fiber bundle is different from an arrangement position of an entrance end of the present optical fiber at an entrance end of the mixed fiber bundle.
11. A lighting assembly comprising a light source and a light guide as claimed in any one of claims 1 to 10.
12. A lighting assembly as recited in claim 11, wherein said light source is a multi-wavelength light source for emitting at least two color illumination beams toward said light guide, and wherein the incident light spots of each color illumination beam into said light guide do not completely overlap.
13. An endoscope system, comprising: a mirror and a lighting assembly according to claim 11 or 12, wherein the light source is disposed in the mirror, and the light guide extends through the mirror to a distal end of the mirror.
14. The endoscope system of claim 13, wherein the light source is disposed at an operation portion of the scope.
CN202210662699.2A 2022-06-13 2022-06-13 Light guide device, lighting assembly and endoscope system Pending CN117257214A (en)

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CN202210662699.2A CN117257214A (en) 2022-06-13 2022-06-13 Light guide device, lighting assembly and endoscope system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210662699.2A CN117257214A (en) 2022-06-13 2022-06-13 Light guide device, lighting assembly and endoscope system

Publications (1)

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CN117257214A true CN117257214A (en) 2023-12-22

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