Resin lenses

Resin lenses are lenses made of organic materials. Internally, it is a polymer chain like structure that is connected to form a three-dimensional network structure. The intermolecular structure is relatively relaxed, and there is space for relative displacement between the molecular chains. The light transmittance is 84% -90%, with good transparency, and the optical resin lens has strong impact resistance.

Resin can be divided into two types: natural resin and synthetic resin. Natural resin is a hydrocarbon secretion from various plants, especially pine and cypress plants. Due to its unique chemical structure and its ability to be used as latex paint and adhesive, it is highly valued. Due to its mixture of various polymer compounds, its melting point is also different. There are many types of resins, which are widely used in light and heavy industries, and can also be seen in daily life, such as plastics, resin glasses, and coatings. Resin lenses are lenses formed by chemically synthesizing and processing resin as raw material.

Advantages and disadvantages:

advantage

1. Light: The density of general resin lenses is 0.83-1.5, while that of optical glass is 2.27-5.95.

2. Strong impact resistance: The impact resistance of resin lenses is generally 8-10 kg/cm ², which is several times that of glass, making them less prone to breakage and safe and durable.

3. Good transparency: In the visible light range, the transmittance of resin lenses is close to that of glass; Infrared light range, slightly higher than glass; In the ultraviolet region, the transmittance decreases with decreasing wavelength starting at 0.4um. Light with a wavelength less than 0.3um is almost completely absorbed, resulting in poor UV transmittance.

4. Low cost: Injection molded lenses can be mass-produced with precision molds, greatly reducing the cost per piece.

5. Can meet special needs: such as the production of non spherical lenses is no longer difficult, while glass lenses are difficult to achieve.

shortcoming

Disadvantages: The surface wear resistance and chemical corrosion resistance are worse than glass, the surface is easy to scratch, and the water absorption is greater than glass. These disadvantages can be improved by coating methods. The fatal disadvantage is high thermal expansion coefficient, poor thermal conductivity, low softening temperature, and easy deformation, which affects optical performance.

characteristic:

optical characteristics

1. The surface gloss and smoothness of resin lenses are no less than those of ordinary glass lenses.

2. The refractive index of resin lenses is lower than that of ordinary glass lenses, so resin lenses of the same degree are thicker.

3. The dispersibility of resin lenses is extremely similar to that of ordinary glass lenses.

4. The transmittance of resin lenses reaches 92%, which is more than 2% higher than that of ordinary glass lenses.

5. The surface reflection of resin lenses is lower than that of ordinary glass lenses, and it is also less dazzling, due to its higher transmittance and lower refractive index.

6. The dual lens of resin lenses is made up of a whole piece, not fused together like ordinary glass dual lenses, so resin dual lenses have no color difference.

7. The optical properties of resin lenses are extremely stable and will not change at high or low temperatures.

mechanical properties

1. Resin lenses can be cast into various shapes with high transparency and meet optical requirements.

2. Resin lenses are easier to frame at the edge of a car than regular glass lenses.

3. Resin lenses are easy to dye and can be dyed into various colored lenses with different light transmittance as needed.

Physical characteristics:

1. Resin lenses have a lightweight texture and weigh only half of regular glass lenses.

2. Resin lenses have strong impact resistance.

3. When resin lenses are shattered by impact, there are fewer fragments, and the fragment area is large with blunt edges; Minimize injuries to the eyes and face.

4. Although resin lenses have been used for a long time, the surface of the lenses is not easily cracked.

5. Resin lenses have strong impact resistance against objects with high temperatures and small body shapes. When such objects collide with resin lenses, they will immediately pop open; Unlike regular glass lenses, which can easily cause dents and spots. Therefore, when welding or using grinding wheels, resin lenses can be used as a defense to prevent eye damage from splashing sparks.

6. Due to the lower thermal conductivity of resin lenses, their anti fog performance is better than that of ordinary lenses.

chemical properties

1. Resin lenses have a wide range of resistance to chemicals and chemical solvents. Household chemicals and solvents almost never cause harm to resin lenses.

2. The thermal conductivity of resin lenses is low, and when heated, they have extremely high heat resistance. At a certain high temperature, they are not prone to bending or twisting deformation.

Maintenance and use:

1. When not wearing glasses, they should be placed in the glasses case and the outer surface of the lens should not come into contact with hard objects.

2. Rinse with tap water before wiping the lenses. If there is oil stains, you can drip a little dishwashing detergent and rinse it off with tap water, then use a soft tissue to absorb the water.

3. Use a specialized fiber cloth to wipe the lenses. If the fiber cloth is dirty, it can be cleaned and reused.

4. Resin film or universe film should be guarded against high temperatures, do not wear glasses to take a hot shower, and do not wear glasses to take a sauna; Do not place your glasses in an unmanned car during summer; Do not blow hot air directly onto the lens when blowing.

5. Although the surface of resin lenses has undergone special hardening treatment, they are still slightly inferior to glass, so it is necessary to avoid friction with hard objects. Try not to wear it while swimming at the seaside.