Ultra-miniature interval control method for imaging components

Abstract

The object of the present invention is to provide a method for controlling the ultra-small interval of an imaging component. It replaces the traditional ultra-small air interval with a transparent optical resin, uses the optical resin to glue adjacent lens groups together, and there is no need to adopt a fixed structure with extremely high precision between the lens group and the lens barrel, reducing the processing cost. The imaging component is composed of multiple lens groups, each lens group contains at least one lens, and there is an ultra-small interval between at least two adjacent lens groups. The ultra-small interval is filled with a liquid optical resin, and then the optical resin is cured to obtain an imaging component in which the lens groups are filled and glued with the transparent optical resin.

Description

Technical Field

[0001] The present invention relates to a method for controlling ultra - micro intervals of an imaging component. Background Art

[0002] In the design of optical imaging components such as lenses, in order to eliminate various optical aberrations, a combined structure composed of multiple lens groups is adopted to eliminate chromatic aberration, coma, spherical aberration, astigmatism, distortion, field curvature and other aberrations caused by the spherical lens system.

[0003] The air interval between each lens group of the imaging component, called the air layer, is an important factor affecting the spherical aberration, astigmatism, magnification, chromatic aberration coefficient and other aberrations of the imaging component due to the deviation between the air layer and the design value caused by part manufacturing errors or assembly errors.

[0004] For high - end optical lenses, in order to better eliminate the aberrations caused by the air layer between lens groups, the design value of the relevant air layer and its tolerance are controlled very strictly. The design value of the air layer is at the 10 - um level, and its manufacturing tolerance reaches the um level.

[0005] For such a small air layer, how to fix the lens group on the lens barrel is a difficult problem, which puts extremely high requirements on the processing accuracy of the lens group and the lens barrel for fixing the lens group, increasing the manufacturing and assembly difficulties.

[0006] In the case where the working space requirements for the imaging component are very compact, such as in an endoscope optical system with a clear aperture of only 1 - 2 mm, an air layer at the 10 - um level is basically impossible to achieve. Summary of the Invention

[0007] The object of the present invention is to provide a method for controlling ultra - micro intervals of an imaging component, which replaces the traditional ultra - micro air interval with a transparent optical resin, glues adjacent lens groups with the optical resin, and does not require a fixed structure with extremely high precision between the lens group and the lens barrel, reducing the processing cost.

[0008] The method for controlling ultra - micro intervals of the imaging component of the present invention, the imaging component is composed of multiple lens groups, each lens group contains at least one lens, there is an ultra - micro interval between at least two adjacent lens groups, the ultra - micro interval is filled with a liquid optical resin, and then the optical resin is cured to obtain an imaging component in which the lens groups are filled and glued with the transparent optical resin.

[0009] For the above method for controlling the ultra - minute interval of the imaging component, when assembling the imaging component, first place the first lens group on the base, with at least a part of the upper outer circumference of the first lens group exposed from the base. Then, sleeved the lower part of the sleeve with the second lens group inside on the upper outer circumference of the first lens group. Adjust the lifting of the sleeve through the lifting mechanism until the axial interval distance between the first lens group and the second lens group meets the requirements. Inject liquid optical resin through the glue injection port opened on the sleeve wall and communicating with the interval between the first lens group and the second lens group. The liquid optical resin fills the interval. After the optical resin cures, disconnect the first lens group and the second lens group glued together from the base and the sleeve.

[0010] For the above method for controlling the ultra - minute interval of the imaging component, a lifting ring is fixed on the upper outer part of the sleeve, and a lifting rod is fixed on the end face of the lifting ring. The upper part of the lifting rod is in threaded cooperation with the rotating handle, and the rotating handle rotates on the bracket.

[0011] For the above method for controlling the ultra - minute interval of the imaging component, the optical resin selected is an optical resin with a refractive index close to that of air.

[0012] Advantages of the present invention:

[0013] The present invention changes the traditional air layer, replaces the traditional air layer with transparent optical resin, and reduces the requirements for the processing and installation accuracy of components such as lens groups and lens barrels. After replacing the air layer with transparent optical resin, due to the different refractive indices of the optical resin and the air layer, the relevant optical parameters of the lens group in the imaging component will be slightly different from those of the imaging component with an air layer. This needs to be considered when designing the overall optical system of the imaging component. Of course, the design of the overall optical system belongs to the prior art.

[0014] Optical resin belongs to the prior art. When selecting optical resin, it is necessary to select one with a refractive index as close to that of air as possible to reduce the impact on imaging quality.

[0015] As for how to fill the ultra - minute interval with liquid optical resin, there are many methods. The method using the devices such as the sleeve, base, and lifting mechanism of the present invention is relatively simple and easy to implement. Description of the Drawings

[0016] Figure 1 It is a schematic diagram when assembling the imaging component;

[0017] Figure 2 It is an overall view when assembling the imaging component. Detailed Embodiments

[0018] See Figure 1 、 2As shown in the figure, when assembling the imaging component, first place the first lens group 8 on the base 1, with at least a part of the upper outer circle of the first lens group exposed from the base. Then, fit the lower part of the sleeve 2 with the second lens group 9 inside onto the upper part of the outer circle of the first lens group. A lifting ring 3 is fixed to the upper outer part of the sleeve, and a lifting rod 4 is fixed to the end face of the lifting ring. The upper part of the lifting rod 4 is in threaded engagement with the rotating handle 5, and the rotating handle 5 rotates on the bracket 6. By rotating the rotating handle 5, the lifting rod 4, the lifting ring 3, and the sleeve 2 are lifted or lowered until the axial spacing distance between the first lens group and the second lens group meets the design requirements.

[0019] Inject the liquid optical resin 10 through the glue injection port 21 opened on the sleeve wall and communicating with the space 7 between the first lens group and the second lens group. The liquid optical resin fills the space. After the optical resin is cured (for example, it can be cured by ultraviolet light irradiation or other curing methods), the first lens group and the second lens group glued together can be separated from the base and the sleeve by conventional methods.

[0020] The optical resin 10 is selected as an optical resin with a refractive index close to that of air.

Claims

1. Method for controlling ultra - micro interval of imaging components, wherein the imaging components are composed of multiple lens groups, each lens group contains at least one lens, and there is an ultra - micro interval between at least two adjacent lens groups, and the method is characterized in that: Fill the ultra-small gap with a liquid optical resin, and then cure the optical resin to obtain an imaging assembly in which the lens groups are filled and glued with a transparent optical resin; When assembling the imaging assembly, first place the first lens group on the base, with at least a part of the upper outer circle of the first lens group exposed from the base. Then, fit the lower part of the sleeve with the second lens group inside onto the upper outer circle of the first lens group. Adjust the lifting of the sleeve through the lifting mechanism until the axial spacing distance between the first lens group and the second lens group meets the requirements. Inject the liquid optical resin through the injection port opened on the sleeve wall and communicating with the gap between the first lens group and the second lens group. The liquid optical resin fills the gap. After the optical resin cures, disconnect the glued first lens group and second lens group from the base and the sleeve.

2. The method for controlling the ultra - small interval of the imaging component according to claim 1, characterized in that: A lifting ring is fixed to the upper outer part of the sleeve, and a lifting rod is fixed to the end face of the lifting ring. The upper part of the lifting rod is in threaded cooperation with the rotating handle, and the rotating handle rotates on the bracket.

3. The method for controlling the ultra-small interval of the imaging component according to claim 1, wherein: The optical resin selected is an optical resin with a refractive index close to that of air.

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