What are the factors associated with optical lens resolution?

Release time:

2024-06-25

An optical lens is an optical element made of transparent material and is an independently assembled part. It includes a lens barrel (including an aperture), a lens, a spacer, a stopper and other structures. The more mature technology of optical lens manufacturers is the single substrate coating process, that is, the use of glass, crystal, PC or resin and other materials, through the optical technology to make the lens substrate, and then use the coating process to coat the surface, with wear resistance, anti-fouling, anti-ultraviolet, anti-radiation, anti-blue, anti-glare and other functions. So what are the factors related to the resolution of the optical lens?

optical lens resolution related to what factors:

1. Color difference

Chromatic aberration is a serious defect of lens imaging, which occurs when polychromatic light is the light source, and monochromatic light does not produce chromatic aberration. White light is composed of seven kinds of red, orange, yellow, green, cyan, blue and purple. The wavelengths of all kinds of light are different, so the refractive index when passing through the lens is also different, so that a point on the object side may form a color spot on the image side. Chromatic aberration generally has position chromatic aberration, chromatic aberration of magnification. Position chromatic aberration makes the image observed in any position with color spots or halos, making the image blurred. And the chromatic aberration of magnification gives the image a colored edge.

2. Spherical aberration

Spherical aberration is the monochromatic phase difference of a point on the axis, caused by the spherical surface of the lens. The result of spherical aberration is that after imaging, a point is not a bright spot, but a bright spot with a bright middle and gradually blurred edges. This affects the imaging quality.

The correction of spherical aberration is often eliminated by the combination of lenses. Since the spherical aberration of convex and concave lenses is opposite, convex and concave lenses of different materials can be selected to be cemented to eliminate. In the old type of microscope, the spherical aberration of the objective lens is not completely corrected, and it should be matched with the corresponding compensation eyepiece to achieve the correction effect. The spherical aberration of the general new type microscope is completely eliminated by the objective lens.

3. Huicai

The coma is a monochromatic phase difference at the point outside the axis. When an off-axis object point is imaged with a large aperture beam, after the emitted beam passes through the lens and no longer intersects one point, the image of the light point will get a comma shape, which is like a comet, so it is called "coma".

4. Astigmatism

Astigmatism is also an off-axis point monochromatic phase difference that affects sharpness. When the field of view is large, the object point on the edge is far away from the optical axis, and the beam tilt is large, causing astigmatism after passing through the lens. Astigmatism causes the original object point to become two separate and perpendicular short lines after imaging, which form an elliptical spot after synthesis on the ideal image plane. Astigmatism is eliminated by complex lens combinations.

5. Field song

Field song is also called "like field bending". When there is a field curvature in the lens, the intersection of the entire beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface. In this way, the entire phase cannot be seen clearly at the same time during microscopic examination, causing difficulties in observation and photography. Therefore, the objective lens of the research microscope is generally a flat field objective lens, which has corrected the field curvature.

6. Distortion

All the above-mentioned differences, except for field curvature, affect the clarity of the image. Distortion is a phase difference of another nature, and the concentricity of the beam is not destroyed. Therefore, the sharpness of the image is not affected, but the image is distorted in shape compared with the original object.

The above content is an introduction to the optical lens resolution and what factors are related. Different types of optical lens filters can not only filter out ultraviolet rays, but also filter out ultraviolet rays, which can only pass ultraviolet rays, etc. Nowadays, the development of optical lens has experienced a long process, and its role has been fully played in various fields, such as security, vehicle, digital camera, laser, optical instrument and other fields. With the rapid development of optoelectronic technology, its application level has been extended to communication, electronics, manufacturing, medical treatment, people's livelihood and other fields.

Key words:

Changchun International Optoelectronics Expo

Surface defects of optical components

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