Optica Lens

Biconvex Lenses

Product IntroductionBiconvex lenses are primarily used to converge light from a point source or to transmit images to other optical systems. Biconvex lenses are suitable for use in many applications w

A biconvex lens is a type of lens with two convex surfaces, meaning both sides curve outward like the exterior of a sphere. These lenses are thicker at the center and thinner at the edges. Biconvex lenses are fundamental components in optics and are widely used due to their ability to converge (focus) light rays that pass through them, hence they are also referred to as converging lenses.


Key Features of Biconvex Lenses:
1.Convex Surfaces:
 Both surfaces of the lens bulge outward, resembling the external shape of a segment of a sphere.
2.Positive Focal Length:
 Unlike biconcave lenses, biconvex lenses have a positive focal length because they cause parallel incident light rays to converge after passing through the lens, potentially forming a real image.
3.Image Formation:
 Depending on the position of the object relative to the lens, a biconvex lens can form real inverted images (beyond the focal point), virtual upright images (between the lens and the focal point), or can magnify objects when placed close to the lens.
4.Magnification:
 Biconvex lenses can produce both magnified and demagnified images, depending on the location of the object and the properties of the lens.
5.Correction of Vision:
 In corrective eyewear, biconvex lenses are used to correct hyperopia (farsightedness), helping to bring the focus of incoming light forward onto the retina.


Applications of Biconvex Lenses:
1.Corrective Eyewear:
 For individuals with farsightedness, biconvex lenses help to converge light entering the eye so that it properly focuses on the retina.
2.Cameras:
 In camera systems, biconvex lenses are used to focus incoming light onto the film or digital sensor, capturing clear images.
3.Magnifying Glasses and Loupes:
 Due to their ability to magnify, biconvex lenses are used in simple magnifiers and more complex devices like jeweler's loupes.
4.Telescopes and Microscopes:
 In compound microscopes and refracting telescopes, biconvex lenses are often part of the objective or eyepiece systems to magnify and focus images.
5.Projectors:
 In overhead projectors and slide projectors, biconvex lenses are used to project images onto a screen by converging light from a smaller source.'


Properties Influencing Function:
- Lens Material:
 The refractive index of the lens material determines how much the light is bent as it travels through the lens.
- Curvature of the Surfaces:
 The curvature of each surface affects the degree of convergence and the position of the focal point.
- Thickness:
 The thickness of the lens, particularly the central part, influences its optical power and can affect aberrations like spherical aberration.
- Lens Separation (in Compound Lenses):

 In multi-lens systems, the spacing between lenses also plays a significant role in the final image quality and focusing abilities.


camera filter


Biconvex lenses

Material

K 9, optical glass, UV quartz, fluorine

Focallength(f)

±2%@587.6nm

Dimensional tolerances

-0.02~0.1mm

Center thickness tolerance

±0.02~0.1mm

Centering(arcmin)

30"~3'

Power

1~5

Irregularity

0.2~0.5

Surface quality

60-40 40-20

Clear aperture

>90%

Coating

AR coating

Conventional Model

Diameter

Focal length

Back focal length

Center thickness

Edge thickness

Radius of curvature

6.0mm

10.0mm

9.2mm

2.4mm

1.5mm

9.9mm

6.0mm

12.0mm

11.2mm

2.3mm

1.5mm

12.0mm

9.0mm

20.0mm

19.0mm

2.8mm

1.8mm

20.1mm

12.7mm

15.0mm

13.4mm

4.7mm

1.8mm

14.6mm

12.7mm

25.0mm

23.8mm

3.4mm

1.8mm

25.2mm

12.7mm

30.0mm

28.9mm

3.1mm

1.8mm

30.4mm

12.7mm

50.0mm

49.1mm

2.6mm

1.8mm

51.1mm

25.4mm

25.4mm

22.2mm

9.0mm

1.8mm

24.5mm

25.4mm

40.0mm

37.9mm

6.1mm

2.0mm

40.1mm

50.8mm

150.0mm

147.6mm

7.2mm

3.0mm

153.3mm

 

 Product Parameters

Biconvex lenses

Material

K 9, optical glass, UV quartz, fluorine

Focallength(f)

±2%@587.6nm

Dimensional tolerances

-0.02~0.1mm

Center thickness tolerance

±0.02~0.1mm

Centering(arcmin)

30"~3'

Power

1~5

Irregularity

0.2~0.5

Surface quality

60-40 40-20

Clear aperture

>90%

Coating

AR coating

 camera filter

Conventional Model

Diameter

Focal length

Back focal length

Center thickness

Edge thickness

Radius of curvature

6.0mm

10.0mm

9.2mm

2.4mm

1.5mm

9.9mm

6.0mm

12.0mm

11.2mm

2.3mm

1.5mm

12.0mm

9.0mm

20.0mm

19.0mm

2.8mm

1.8mm

20.1mm

12.7mm

15.0mm

13.4mm

4.7mm

1.8mm

14.6mm

12.7mm

25.0mm

23.8mm

3.4mm

1.8mm

25.2mm

12.7mm

30.0mm

28.9mm

3.1mm

1.8mm

30.4mm

12.7mm

50.0mm

49.1mm

2.6mm

1.8mm

51.1mm

25.4mm

25.4mm

22.2mm

9.0mm

1.8mm

24.5mm

25.4mm

40.0mm

37.9mm

6.1mm

2.0mm

40.1mm

50.8mm

150.0mm

147.6mm

7.2mm

3.0mm

153.3mm

 




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