CN218824878U - Optical structure for internal scanning panoramic imaging - Google Patents

Abstract

The utility model provides an optical structure for internal scanning panorama formation of image relates to the optoelectronic equipment field under water. Optical structure includes the super hemisphere window and the seal structure of transparent, "omega" type, the super hemisphere window includes the super hemisphere face structure on upper portion and the window mounting flange of lower part, the super hemisphere window comprises the spherical crown that exceeds 50% sphere, seal structure with the opening size of spherical crown matches, and follows the both sides of window mounting flange are right in step the super hemisphere window seals. The utility model discloses a scheme can be applied to novel photoelectric imaging equipment under water to solve its internal scan panorama formation of image, the withstand voltage sealed key technological problem under water, can improve comprehensive efficiency such as this equipment photoelectric imaging performance, reliability, environmental suitability.

Description

Optical structure for internal scanning panoramic imaging

Technical Field

The utility model discloses the creation belongs to the optoelectronic device field under water, concretely relates to an optical structure for interior scanning panorama formation of image.

Background

Aiming at the underwater internal scanning panoramic imaging photoelectric equipment, the optical protection window of the underwater internal scanning panoramic imaging photoelectric equipment needs to simultaneously meet the design requirements of optical imaging, pressure resistance, sealing and the like. Compared with the forms of a plane window (a plurality of combined splices), a cylindrical window and the like, the spherical window has the following outstanding advantages: (1) The optical imaging is free of shielding, and the 360-degree panoramic imaging requirement is met; (2) The pressure resistance is stronger, and the thickness of the window can be reduced by more than 50% under the same pressure; and (3) the sealing is relatively simple and reliable, and leakage is easily avoided. Therefore, the spherical window structure is particularly suitable for application occasions with high requirements on pressure resistance.

For common monitoring lenses and other common photoelectric imaging equipment, when a spherical window is designed, a hemispherical window and a local spherical window structure are mostly used, and the common photoelectric imaging equipment is combined with a common optical glass material, so that the manufacturing is relatively simple; in the aspect of fixing and sealing, one of the modes such as a rubber pad, an O-shaped ring or gluing is adopted in many ways so as to simply isolate the internal environment from the external environment, and the requirements for higher fixing and mounting precision are not met. However, for the photoelectric imaging device used underwater, when the factors such as the optical imaging range, the large alternating pressure, the sealing reliability and the like are comprehensively considered, the conventional ball window structure design and the fixed sealing mode are difficult to meet the design requirements. In addition, for specific use requirements such as multispectral optical imaging and optical high-precision measurement, requirements of optical materials and installation precision need to be considered, and the difficulty of designing the pressure-resistant sealing structure of the optical window is further increased.

SUMMERY OF THE UTILITY MODEL

This patent proposes an optical structure that can be applicable to underwater equipment, and this optical structure is including being used for the optics window of inside scan panorama formation of image and withstand voltage seal structure thereof. The optical structure of this patent can satisfy 360 panorama formation of image of optical window simultaneously, withstand voltage sealed, installation location etc. design operation requirements under water, can solve novel optoelectronic equipment's under water internal scanning panorama formation of image, environmental suitability problem.

Particularly, the utility model provides an optical structure for internal scanning panorama imaging, optical structure includes transparent, "omega" type hyper-hemispherical window and seal structure, hyper-hemispherical window includes the hyper-hemispherical structure on upper portion and the window mounting flange of lower part, hyper-hemispherical window comprises the spherical cap that exceeds 50% sphere, seal structure with the opening size of spherical cap matches, and follows window mounting flange's both sides are in step right hyper-hemispherical window seals.

Further, smooth transition is carried out between the hyper-hemispherical surface structure of the hyper-hemispherical window and the annular fixing part.

Further, seal structure includes back cover structure and window clamp plate, the back cover structure has the annular groove, window mounting flange with the size matching of annular groove and the lower extreme stretches into in the annular groove, the window clamp plate is followed window mounting flange's upper end is right window mounting flange fixes, and the window clamp plate with back cover structure is from outside fixed connection in order to realize right window mounting flange's sealed fixed.

Further, the inner surface of the window mounting flange has an inner conical surface, and the bottom sealing structure has an inner conical surface matched with the inner conical surface of the window mounting flange.

Further, a first gasket is arranged in an annular groove of the sealing structure, and a second gasket is arranged between the window mounting flange and the window pressing plate.

Furthermore, a first sealing ring is arranged in the annular groove of the back cover structure at a position matched with the outer end face of the window mounting flange.

Furthermore, a second sealing ring is embedded in the inner conical surface of the bottom sealing structure.

Further, the spherical internal angle corresponding to the hyper-hemispherical window is greater than or equal to 200 degrees.

Introduction to the principle

The optical protection window is the most important pressure-resistant sealing part of the underwater pressure-resistant photoelectric equipment. Based on the basic structure form of the spherical window, the optical structure provided by the patent is improved in the aspects of structure, material, installation, sealing design and the like so as to meet the specific design and use requirements of certain novel photoelectric equipment on the optical window.

The optical window of the patent structurally adopts the design of an ultra-hemispherical window, the inner spherical surface and the outer spherical surface adopt optical precision polishing, the sphericity, the thickness difference, the spherical center distance error and the surface shape precision of the inner spherical surface and the outer spherical surface are controlled, the panoramic imaging requirement of the range of 360 degrees in azimuth and more than 90 degrees in height (calculated by taking the rotary axial direction of the spherical window as 0 degree) can be ensured, and the maximum pressure resistance can meet the use in the environment with 6MPa or even higher pressure.

The optical window is made of multispectral optical materials such as sapphire and spinel, can be used for spectral imaging of visible light-medium wave infrared (0.4-5 mu m) wide wave bands, and meets the use requirements of multiple wave bands, high transmittance, chemical corrosion resistance and the like.

The pressure-resistant sealing structure of the hyper-hemispherical optical window is installed by matching an end face flange with other metal components. Specifically, the bottom of the hyper-hemispherical optical window adopts a back cover structure as a first mounting and supporting surface, and the back cover structure is matched with the end surfaces of metal components such as an outer window pressing plate and the like to realize sealing. The back cover structure is provided with an annular groove for accommodating a lower window mounting flange of the hyper-hemispherical optical window, and a lower gasket (annular flat gasket) is added between the back cover structure and the hyper-hemispherical optical window to avoid direct contact between the optical glass and the back cover structure; the inner surfaces of the window mounting flange of the hyper-hemispherical optical window and the adjacent end surface of the bottom of the flange adopt a certain inclination angle design to form an inner conical surface which is used as a second mounting and supporting surface; furthermore, the inner conical surface is used as a main sealing surface of the hyper-hemispherical optical window, the smoothness meets the sealing requirement, meanwhile, a rectangular groove is designed on the outer conical surface of the bottom sealing structure and is used for placing a rubber sealing ring, and the inner conical surface and the outer conical surface are matched and assisted with the sealing ring so as to realize structural sealing; further, the bottom window mounting flange of the hyper-hemispherical optical window adopts an outer cylindrical surface design as a secondary sealing surface, is polished according to the requirement of sealing finish, and is matched with an inner cylindrical surface on the side surface of the annular groove (the inner surface of the side surface is also provided with a rectangular groove for placing a rubber sealing ring) to form a radial sealing structure; furthermore, the upper end face of a window mounting flange of the hyper-hemispherical optical window is matched with the window pressing plate, and an upper gasket (flexible buffer flat gasket) is additionally arranged between the upper end face and the window pressing plate and used for fixedly connecting the hyper-hemispherical optical window and the photoelectric equipment integral component.

The optical structure of this patent is particularly useful for big alternating pressure service environment under water, and has the optoelectronic device of harsh requirement to light mechanical structure design, formation of image scope and precision. Compared with the conventional panoramic imaging optical window and the pressure-resistant sealing structure thereof, the technical scheme disclosed by the patent has the following beneficial effects:

(1) The hyper-hemispherical optical window made of multispectral materials such as sapphire and spinel can meet the requirements of multiband high transmittance from visible light to infrared and the like and internal scanning panoramic imaging, is not shielded by a structural member in a field range, has compact structural design, and can solve the use problems of pressure resistance, sealing and the like in a deep environment.

(2) The bottom flange of the super-hemispherical optical window adopts a structural design with a plurality of bearing surfaces, so that the bearing capacity of the optical window can be further improved. The first mounting and supporting surface (the bottom end surface of the flange) is used for bearing most of axial pressure borne by the ball window under external pressing; the second mounting supporting surface (flange inner conical surface) adopts an inner conical surface design, can bear the tangential pressure along the circumferential direction under the external pressure of the spherical window, converts the bending stress of the thin wall of the spherical window into the compressive stress, and greatly improves the pressure-bearing capacity.

(3) The bottom flange inner conical surface and the seal structure outer conical surface of hyper-hemispherical optical window cooperate to meet the accurate positioning requirement of the whole component of the football window and the photoelectric equipment, so that the sphere center of the football window is always positioned on the optical axis of the optical system in the photoelectric equipment under the action of alternating external force, and the pointing error of the optical axis caused by non-coaxial is avoided, thereby meeting the requirement of high-precision optical measurement.

(4) The bottom flange of the hyper-hemispherical optical window adopts a multi-stage sealing structure design, so that the optical window can be effectively and reliably sealed under the action of large alternating pressure. The sealing surface between the bottom flange and the sealing structure adopts a conical surface sealing design and has the advantages of end surface and radial sealing modes; the secondary sealing surface outside the annular edge of the optical window plays a role in multi-stage sealing and can prevent water from entering a lower gasket of the bottom end face of the flange (special requirements such as corrosion resistance and electrification).

(5) The design of upper and lower gaskets is added between the upper and lower end faces of the hyper-hemispherical optical window flange and the metal component of the flange, so that the direct contact between the rigid metal surface and the brittle window material can be avoided, and the window is prevented from being broken and damaged due to overlarge local sharp point stress.

To sum up, the technical scheme that this patent relates can be applied to certain novel photoelectric imaging equipment under water to solve its internal scanning panorama formation of image, the withstand voltage sealed key technological problem under water, can improve comprehensive efficiency such as this equipment photoelectric imaging performance, reliability, environmental suitability.

Drawings

Fig. 1 is a cross-sectional structural view of a transparent optical window in a hyper-hemispherical optical window structure.

Fig. 2 is a schematic cross-sectional view of an assembly structure of a hyper-hemispherical optical window and a sealing structure.

Fig. 3 is a partially enlarged view of the junction of the hyper-hemispherical optical window and the sealing structure.

Detailed Description

The technical solution and the specific embodiments of the present invention will be further described with reference to the accompanying drawings.

Fig. 1 to 3 show an exemplary embodiment of the optical structure for internal scanning panoramic imaging according to the present invention.

Fig. 1 is a cross-sectional structural view of a transparent optical window in a hyper-hemispherical optical window structure. The optical window of the present embodiment adopts a super-hemispherical window shape, the cross section of which is shaped like an omega, the upper part of the optical window is a spherical cap with more than 50% of spherical surface, and the lower part of the optical window is provided with an annular flange structure which is used as a mounting flange. The hyper-hemispherical optical window is integrally processed by sapphire crystals or spinel (the c-direction crystal axis is consistent with the axial direction of the window), the outer diameter of the spherical window is 200-400mm, and the thickness of the spherical window is 5-30mm. From the sectional view, the spherical cap should have an internal spherical angle greater than 180 degrees, preferably between 200 and 240 degrees.

The super-hemispherical area in the figure is an imaging light transmission range and adopts optical precision polishing; the angle of the inner conical surface of the flange is generally 15-30 degrees, and the angle deviation is generally less than +/-0.05 degrees; the transition part between the flange and the outer spherical surface is designed as a round angle; the perpendicularity error between the end face of the flange and the rotating shaft of the window is generally less than 0.03.

Fig. 2 is a schematic cross-sectional view of an assembly structure of a hyper-hemispherical optical window and a sealing structure. The hyper-hemispherical optical window 1 is connected and fixed with other metal components of the whole machine through a bottom end flange 11, and a pressure-resistant sealing cavity is formed inside the hyper-hemispherical optical window to isolate the internal and external environments of the photoelectric equipment. And a sealing structure is required to be arranged between the bottom end flange 11 and the whole machine so as to complete the combination of the optical window and the whole machine.

Fig. 3 is a partially enlarged view of the junction of the hyper-hemispherical optical window and the sealing structure.

As shown in fig. 2-3, a sealing structure 10 is provided below the hyper-hemispherical window 1. The sealing arrangement serves to receive and seal the underlying window mounting flange 11. Seal structure 10 includes back cover structure 8 and window clamp plate 2, and back cover structure 8 has the annular groove, and window mounting flange 11 matches with the size of annular groove and in the lower extreme stretched into the annular groove, window clamp plate 2 was right from window mounting flange's upper end window mounting flange fixes to window clamp plate 2 and back cover structure 8 are from outside fixed connection in order to realize the sealed fixed to window mounting flange 11. It should be noted that all the drawings shown in this patent are cross-sectional views, and the overall structure of the product is an axisymmetric structure, and the structure of the product can be known to those skilled in the art based on the cross-sectional views.

In this embodiment, the window pressing plate 2 is a semicircular structural member, and both the window pressing plate 2 and the back cover structure 8 are titanium alloy structural members, and have good seawater corrosion resistance. And a first sealing ring 5 is arranged in the annular groove of the back cover structure 8 and at a position matched with the outer end face of the window mounting flange 11. And a second sealing ring 7 is embedded in the inner conical surface of the bottom sealing structure 8, and the first sealing ring 5 and the second sealing ring 7 are fluororubber O-shaped sealing rings. When the optical window contacts the sealing structure, the O-shaped ring has a compression amount to isolate seawater from entering the inner cavity. A first gasket 6 is arranged in the annular groove of the sealing structure, and a second gasket 2 is arranged between the window mounting flange 11 and the window pressing plate 2. The first gasket 6 and the second gasket 2 may be made of rubber compound or polytetrafluoroethylene as a buffer material to prevent direct contact between glass and metal parts. Screws 4 connect the window press plate and the back cover structure 8 to form an integral window assembly.

It should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the scope of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some technical features may be substituted equally. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An optical structure for internal scanning panoramic imaging, characterized in that, the optical structure includes transparent, "omega" type hyper-hemispherical window and seal structure, the hyper-hemispherical window includes the hyper-hemispherical structure on upper portion and the window mounting flange of lower part, the hyper-hemispherical window comprises the spherical cap that exceeds 50% sphere, seal structure with the opening size of spherical cap matches, and follows the both sides of window mounting flange are in step right the hyper-hemispherical window seals.

2. The optical structure for intra-scan panoramic imaging according to claim 1, wherein there is a smooth transition between the hyper-hemispherical structure of the hyper-hemispherical window and the window mounting flange.

3. An optical structure for internally scanning panoramic imaging, as claimed in claim 1, wherein the sealing structure includes a back cover structure and a window press plate, the back cover structure has an annular groove, the window mounting flange matches the size of the annular groove and the lower end extends into the annular groove, the window press plate fixes the window mounting flange from its upper end, and the window press plate is fixedly connected with the back cover structure to realize the sealing fixation of the window mounting flange.

4. The optical structure for inside scan panoramic imaging of claim 3, wherein the inner surface of the window mounting flange has an inner conical surface and the back cover structure has a conical surface that matches the inner conical surface of the window mounting flange.

5. The optical structure for internally scanning panoramic imaging according to claim 4, wherein a first gasket is disposed within the annular groove of the sealed structure and a second gasket is disposed between the window mounting flange and the window platen.

6. The optical structure for inside scanning panoramic imaging according to claim 4, wherein a first sealing ring is arranged in the annular groove of the bottom sealing structure at a position matched with the outer end face of the window mounting flange.

7. The optical structure for internally scanning panoramic imaging according to claim 6, wherein a second sealing ring is embedded in the inner conical surface of the bottom sealing structure.

8. The optical structure for internally scanning panoramic imaging of claim 4, wherein the corresponding internal spherical angle of the hyper-hemispherical window is 200 degrees or more.

9. The optical structure for intra-scan panoramic imaging of claim 4, wherein the hyper-hemispherical window is made of sapphire or spinel.

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