Anti-deformation device suitable for optical window in optical system

Abstract

The invention relates to an optical window anti-deformation device suitable for an optical system, and the device comprises a vacuum cavity housing which is internally provided with a vacuum cavity, the vacuum cavity housing is installed on an external supporting part, one end of the vacuum cavity housing is provided with a corrugated pipe, and the other end of the vacuum cavity housing is provided with a sealing part. Connecting flanges are welded to the two ends of the corrugated pipe, and one end of the corrugated pipe is fixed to the vacuum cavity shell. When in use, the vacuum cavity shell is firstly fixed on the external supporting piece, and then one end, far away from the optical lens, of the corrugated pipe is fixed with the vacuum cavity shell through the connecting flange, so that the corrugated pipe bracket is matched with the mounting plate to fix the optical window formed by the connecting flange, the optical lens and the flange gland; when the air pressure change in the vacuum cavity in the vacuum cavity shell causes deformation of the vacuum cavity shell, compensation can be carried out through stretching or shrinking of the corrugated pipe installed between the vacuum cavity shell and the optical window, so that the effect of preventing deformation of the optical window is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of stability testing in optical systems, and in particular relates to an optical window anti-deformation device suitable for use in optical systems. Background Art

[0002] An optical system is a system composed of lenses, mirrors, prisms, apertures and other optical elements in a certain order, usually used for imaging or optical information processing. An optical system consisting of two or more refractive (or reflective) spherical surfaces with the center of curvature on the same straight line is called a coaxial spherical system, and the line where the center of curvature is located is called the optical axis.

[0003] Optical windows are often used in optical systems. In actual use, optical windows are generally installed directly on the vacuum cavity. When there is a pressure difference between the inside and outside of the vacuum cavity, the vacuum cavity will deform, which is then transmitted to the optical window, affecting the optical stability. Summary of the invention

[0004] The purpose of the present invention is to provide an optical window anti-deformation device suitable for an optical system in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A device for preventing deformation of optical windows in optical systems, comprising a vacuum chamber shell with a vacuum chamber arranged inside, the vacuum chamber shell being installed on an external support member, a bellows being arranged at one end of the vacuum chamber shell, connecting flanges being welded at both ends of the bellows, one end of the bellows being fixed to the vacuum chamber shell, an optical lens being embedded in the connecting flange arranged at an end of the bellows away from the vacuum chamber shell, the connecting flange with the optical lens installed inside being connected to a flange gland via a connecting member at the end away from the vacuum chamber shell, a sealing structure being arranged between the optical lens and the connecting flange and an inner wall of the flange gland, and a supporting structure fixed to an external support member being arranged at the bottom of the connecting flange with the optical lens installed inside.

[0007] As a further optimization solution of the present invention, the vacuum chamber shell is made of stainless steel, and the vacuum chamber shell is fixedly connected to the bellows through the connecting flange installed at one end of the bellows close to the vacuum chamber shell.

[0008] As a further optimization scheme of the present invention, the connecting member is a plurality of fixing bolts distributed in a ring around the flange cover near one end of the bellows, and the free ends of the fixing bolts pass through the connecting flange with the optical lens installed inside and are fixed by external nuts.

[0009] As a further optimization scheme of the present invention, a light-transmitting hole is provided on the side wall of the flange cover at one end away from the vacuum chamber shell, and the light-transmitting hole is coaxially arranged with the optical lens.

[0010] As a further optimization scheme of the present invention, an annular receiving groove is opened on the inner wall of the connecting flange in which the optical lens is installed, and the sealing structure includes a sealing ring arranged on the side of the optical lens close to the vacuum chamber shell, the thickness of the sealing ring is greater than the depth of the receiving groove, one side of the sealing ring is embedded in the receiving groove, and the other side of the sealing ring is in contact with the optical lens.

[0011] As a further optimization scheme of the present invention, the sealing structure also includes a polyfluoro gasket fixedly connected to the inner wall of the flange cover, the polyfluoro gasket is annular in structure, and the side of the polyfluoro gasket away from the inner wall of the flange cover abuts against the side of the optical lens away from the sealing ring.

[0012] As a further optimization solution of the present invention, the supporting structure is a bellows bracket fixedly installed at the bottom of the connecting flange, and one side of the bellows bracket extends outward to form a mounting plate.

[0013] The beneficial effects of the present invention are as follows: when in use, the vacuum chamber shell is first fixed on an external support, and then the end of the bellows away from the optical lens is fixed to the vacuum chamber shell through a connecting flange, and the optical window formed by the connecting flange, the optical lens and the flange cover can be fixed by using the bellows bracket in conjunction with the mounting plate. When the air pressure in the vacuum chamber inside the vacuum chamber shell changes, causing the vacuum chamber shell to deform, the bellows installed between the vacuum chamber shell and the optical window can be stretched or contracted for compensation, so as to achieve the effect of deformation of the optical window. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall installation structure diagram of the present invention;

[0015] Figure 2 It is an exploded view of the overall three-dimensional structure of the present invention;

[0016] Figure 3 The present invention Figure 2 A schematic cross-sectional structure diagram of ;

[0017] Figure 4 It is a schematic diagram of the installation structure of the connecting flange, the bellows bracket and the bellows of the present invention;

[0018] Figure 5 The present invention Figure 4 A magnified view of the local details at center A;

[0019] Figure 6 It is a schematic diagram of the installation position of the polytetrafluoroethylene gasket of the present invention.

[0020] In the figure: 1. Vacuum chamber shell; 2. Bellows; 3. Fixing bolts; 4. Flange cover; 5. PTFE gasket; 6. Optical lens; 7. Sealing ring; 8. Bellows bracket; 9. Connecting flange. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example

[0023] like Figure 1 - Figure 6 As shown, an optical window anti-deformation device suitable for an optical system includes a vacuum chamber housing 1 with a vacuum chamber disposed therein, the vacuum chamber housing 1 is made of stainless steel, and the vacuum chamber housing 1 is mounted on an external support member to fix the vacuum chamber housing 1 and minimize the displacement of the vacuum chamber housing 1 when the internal air pressure of the vacuum chamber housing 1 changes;

[0024] A bellows 2 is provided at one end of the vacuum chamber housing 1, and connecting flanges 9 are welded at both ends of the bellows 2. The vacuum chamber housing 1 is fixedly connected to the bellows 2 through the connecting flange 9 installed near one end of the vacuum chamber housing 1. The connection by the connecting flange 9 is not only stable, but also convenient for installing and replacing the bellows 2.

[0025] An optical lens 6 is embedded in a connecting flange 9 provided at one end of the bellows 2 away from the vacuum chamber housing 1, and an end of the connecting flange 9 with the optical lens 6 installed therein away from the vacuum chamber housing 1 is connected to a flange gland 4 through a connecting piece. The connecting flange 9 provided at one end of the bellows 2 away from the vacuum chamber housing 1 can cooperate with the flange gland 4 to cover the periphery of the optical lens 6 to protect the optical lens 6;

[0026] The connecting piece is a plurality of fixing bolts 3 distributed in an annular manner around one end of the flange gland 4 close to the bellows 2. The free ends of the fixing bolts 3 penetrate the connecting flange 9 with the optical lens 6 installed inside and are screwed and fixed by external nuts. When in use, the free ends of the fixing bolts 3 penetrate the connecting holes provided on the connecting flange 9 provided at the end of the bellows 2 away from the vacuum chamber housing 1, and then the external nuts are sleeved on the free ends of the fixing bolts 3, and the external nuts are tightened to make the connecting flange 9 and the flange gland 4 fit tightly, so as to realize the installation of the flange gland 4;

[0027] A light-transmitting hole is provided on the side wall of the flange gland 4 away from the vacuum chamber housing 1. The light-transmitting hole is coaxially arranged with the optical lens 6, so that external light can pass through the light-transmitting hole and enter the optical lens 6, and the optical information of the light is processed by the optical lens 6;

[0028] A sealing structure is provided between the optical lens 6 and the inner wall of the connecting flange 9 and the flange gland 4. An annular receiving groove is provided on the inner wall of the connecting flange 9 in which the optical lens 6 is installed. The sealing structure includes a sealing ring 7 provided on the side of the optical lens 6 close to the vacuum chamber housing 1. The thickness of the sealing ring 7 is greater than the depth of the receiving groove. One side of the sealing ring 7 is embedded in the receiving groove, and the other side of the sealing ring 7 is in contact with the optical lens 6. The sealing ring 7 is used to seal the connection between the peripheral side of the optical lens 6 and the connecting flange 9. At the same time, since the sealing ring 7 is made of a flexible material, it can be buffered when receiving an external force to protect the optical lens 6.

[0029] The sealing structure also includes a polytetrafluoroethylene gasket 5 fixedly connected to the inner wall of the flange gland 4. The polytetrafluoroethylene gasket 5 is annular in structure. The side of the polytetrafluoroethylene gasket 5 away from the inner wall of the flange gland 4 abuts against the side of the optical lens 6 away from the sealing ring 7. The polytetrafluoroethylene gasket 5 is formed by molding and turning of polytetrafluoroethylene resin, has an extremely low friction coefficient and good corrosion resistance, and can play a good sealing role. At the same time, the polytetrafluoroethylene gasket 5 can compensate and balance rigid deformation and installation errors, greatly improving the installation accuracy of the optical lens 6.

[0030] A supporting structure fixed to an external support member is provided at the bottom of a connecting flange 9 with an optical lens 6 installed inside. The supporting structure is a bellows bracket 8 fixedly installed at the bottom of the connecting flange 9. One side of the bellows bracket 8 extends outward to form a mounting plate. The bellows bracket 8 is provided to fix the connecting flange 9 with the optical lens 6 installed inside to an external support member to avoid the connection flange 9 from moving when the air pressure inside the vacuum chamber shell 1 changes, thereby causing deformation of the optical window formed by the connecting flange 9, the optical lens 6 and the flange cover 4. The mounting plate is provided to increase the contact surface between the bellows bracket 8 and the external support member, thereby improving the stability of the installation of the bellows bracket 8.

[0031] It should be noted that the device is suitable for preventing deformation of optical windows in optical systems. When in use, the vacuum chamber shell 1 is first fixed on an external support, and then the end of the bellows 2 away from the optical lens 6 is fixed to the vacuum chamber shell 1 through the connecting flange 9. The optical window formed by the connecting flange 9, the optical lens 6 and the flange cover 4 can be fixed by using the bellows bracket 8 in cooperation with the mounting plate. When the air pressure in the vacuum chamber inside the vacuum chamber shell 1 changes, causing the vacuum chamber shell 1 to deform, the bellows 2 installed between the vacuum chamber shell 1 and the optical window can be stretched or contracted for compensation to achieve the effect of preventing the optical window from deforming.

[0032] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An optical window anti-deformation device suitable for use in an optical system, comprising a vacuum chamber housing (1) with a vacuum chamber arranged inside, the vacuum chamber housing (1) being mounted on an external support, characterized in that: A bellows (2) is provided at one end of the vacuum chamber shell (1), and connecting flanges (9) are welded at both ends of the bellows (2). One end of the bellows (2) is fixed to the vacuum chamber shell (1), and an optical lens (6) is embedded in the connecting flange (9) provided at the end of the bellows (2) away from the vacuum chamber shell (1). The connecting flange (9) with the optical lens (6) installed inside is connected to a flange pressure cover (4) at the end away from the vacuum chamber shell (1) through a connecting piece. A sealing structure is provided between the optical lens (6) and the connecting flange (9) and the inner wall of the flange pressure cover (4), and a supporting structure fixed to an external supporting piece is provided at the bottom of the connecting flange (9) with the optical lens (6) installed inside.

2. The optical window anti-deformation device for an optical system according to claim 1, characterized in that: The vacuum chamber shell (1) is made of stainless steel, and the vacuum chamber shell (1) is fixedly connected to the bellows (2) via the connecting flange (9) installed near one end of the bellows (2) near the vacuum chamber shell (1).

3. The optical window anti-deformation device for an optical system according to claim 1, characterized in that: The connecting member is a plurality of fixing bolts (3) distributed in an annular manner around the flange cover (4) near one end of the bellows (2); the free ends of the fixing bolts (3) penetrate the connecting flange (9) in which the optical lens (6) is installed and are screwed and fixed by external nuts.

4. The optical window anti-deformation device for an optical system according to claim 1, characterized in that: A light-transmitting hole is provided on the side wall of one end of the flange cover (4) away from the vacuum chamber housing (1), and the light-transmitting hole is coaxially arranged with the optical lens (6).

5. The optical window anti-deformation device for an optical system according to claim 1, characterized in that: An annular receiving groove is provided on the inner wall of the connecting flange (9) in which the optical lens (6) is installed. The sealing structure comprises a sealing ring (7) arranged on the side of the optical lens (6) close to the vacuum chamber shell (1). The thickness of the sealing ring (7) is greater than the depth of the receiving groove. One side of the sealing ring (7) is embedded in the receiving groove, and the other side of the sealing ring (7) is in contact with the optical lens (6).

6. The optical window anti-deformation device for an optical system according to claim 5, characterized in that: The sealing structure also includes a polyfluorocarbon gasket (5) fixedly connected to the inner wall of the flange cover (4), the polyfluorocarbon gasket (5) being in an annular structure, and a side of the polyfluorocarbon gasket (5) away from the inner wall of the flange cover (4) abutting against a side of the optical lens (6) away from the sealing ring (7).

7. According to claim 1, an anti-deformation device for optical windows in optical systems, the supporting structure is a bellows bracket (8) fixedly installed at the bottom of the connecting flange (9), and one side of the bellows bracket (8) extends outward to form a mounting plate.

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