Fresnel lens

Fresne lens have been used in many fields recently because they can exceed the limitations of thickness and area of existing lenses. Also, it can be made according to the shape that the customer wants, and in special cases, it can be made with a cover lens.

Recently, there was a request from a foreign company, KEEPEN and Russia's ARSIBEX, to produce Fresnel lens in the desired color of Fresnel Factory Korea. The condition was to maintain the quality such as performance and strength of Fresnel lens.

Therefore, Fresnel Factory Korea injected Fresnel lens by changing the color to the color that the customer wants while maintaining the quality or specification of the Fresnel lens.

Fresnel Factory Korea designs lenses by selecting materials that suit where customers want them to use, and provides additional services such as sensor-covered Fresnel lens for waterproofing and color changes for Fresnel lens to enhance product completeness.

If you want to change the color, please log on through the link and request it to [Design Request Form.]

Fresnel Factory Korea is a professional optical company that provides not only optical design and lens production, but also product design services that meet customer needs.

Ashton Myung Joong KIM

CEO of FresnelFactory Inc.

USA : +1 415 779 5317 

MOBILE : +82 10-5248-4630

Ashton@fresnelfactory.com

Recently, more and more people are asking about security optics. Usually, security optics use invisible infrared rays. It is constructed by transmitting infrared light to receive light coming back from an object.

There was also an inquiry about the development of a security optics system in FresnelFactory, So we proceeded with the design of an infrared optical system using Fresnel lenses and reflectors.

The following is about the design of an infrared optical system for security conducted by FresnelFactory.

FresnelFactory has modeled NIR lasers, reflectors, and receiver Fresnel lenses through its optical design program.

The security optical system must have as much light as possible on the receptor sensor to increase detection sensitivity. Therefore, we designed it in the form of a reflector, reflecting it with a reflector, and collecting as much light as possible with a Fresnel lens.

The picture below shows a comparison of the distribution of light that reaches the sensor before(left) optimizing and the distribution of light that reaches the sensor after(right) optimizing.

If you look at the results of the optical simulation, the results of fresnel lens pre-optimization(left) show a lot of light spread out of the sensor. After optimization, light was collected into the sensor, and the total amount of light that reached the sensor was about twice the increase.

FresnelFactoryKorea is a professional optical company that designs and manufactures optical systems with specifications that customers want through optical simulation programs.

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Ashton Myung Joong KIM

CEO of FresnelFactory Inc.

USA : +1 415 779 5317 

MOBILE : +82 10-5248-4630

Ashton@fresnelfactory.com

Recently, the development of Fresnel lens for NIR(Near Infrared) is increasing. Near infrared, also called NIR (Near Infrared), has various applications. Used in ADAS, Internet of Thing (IoT), Time of Flight (ToF), beauty and healthcare.

In addition, the demand in the sensor sector is steadily increasing. FresnelFactory Inc. also recently received a request for the development of Fresnel lens that condense the light emitted from the LED with NIR-sensor(Photodiode).

Through optical simulation, Fresnel Factory designed fresnel lens for NIR sensors that increases the light collection efficiency by 37%.

However, these was a mechanical problem with the lens mounting. So FresnelFactory Inc designed a Fresnel lens with TIR(Total Internal Reflection) structure that considered not only the light collecting efficiency but also the mechanical problem.

The Fresnel lens with TIR structure increases the light collecting efficiency by 46%

This lens was developed to condense the light from the LED with NIR-sensor(Photodiode). However, when used in a laser, the efficiency is reduced.

FresnelFactory Inc. is a professional optics company that performs optical design that considers the optical needs of customer and mechanical problems.

In addition, as it has several optical materials, it is possible to respond quickly to the production stage.

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Ashton Myung Joong KIM

CEO of FresnelFactory Inc.

USA : +1 415 779 5317 

MOBILE : +82 10-5248-4630

Ashton@fresnelfactory.com

Fresnel Factory Co,.Ltd exhibited various Fresnel lens for NIR(near-infrared), FIR(Far-infrared) and Motion sensor(PIR, Passive-infrared) at the 2020 SPIE Photonics West. We had a meeting with 83 companies and planned cooperation research with a global optics company.

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Recently, as the interest in the field of IR(Infrared) increased rapidly, many companies visited the Fresnel Factory booth.

We held a development meeting of Fresnel lenses for NIR(near infrared), with a global optics companies. NIR lenses are widely used in beauty, healthcare equipment, breast cancer screening devices, blood flow measuring devices, automotive detectors, safe equipment, distance detectors and smart furniture.

We specifically discussed the supply of Fresnel lenses for infrared cameras and thermal imaging camera with a global optics company. Infrared cameras are installed in autonomous vehicles, IoT(Internet of Things), mobile phones and medical devices to complement the image cameras. Therefore, the demand for infrared sensors and lenses is increasing.

Motion Sensors (PIR, Passive Infrared) are recently installed in all applications due to the demand of smart furniture, IoT and counter sensors. Fresnel factory provides lens design and measuring the performance of Fresnel lens to the customer’s needs.

Fresnel factory has a lot of experience in the design, development and manufacture of Fresnel IR lenses. We select the right lens material for your application wavelength and select the right mold method. In addition, we have performance measuring equipment for IR lenses, so we can conduct quality inspections to meet customer needs.

Ashton Myung Joong KIM

CEO of FresnelFactory Inc.

UAS : +1 415 779 5317

KOR : +82 10-5248-4630

Ashton@fresnelfactory.com

Recently, the development of Fresnel lens for near infrared ray is increasing.

Near infrared, also called NIR (Near Infrared), has various uses.

Used in self-driving cars, Internet of Thing (IoT), Time of Flight (ToF), beauty and healthcare.

Near infrared has a wavelength of 0.75 ~ 3um and has 12 times higher penetration than far infrared.

Therefore, it is widely used in beauty, healthcare equipment, breast cancer screening devices, and blood flow measuring devices.

In addition, the demand in the sensor sector is steadily increasing.

It is widely used for car detectors, safe equipment, street detectors and smart furniture.

When used in the transmitter, the FOV of the NIR light source can be adjusted. When used in the receiver, the sensing distance and detection area can be controlled.

FresnelFactory Inc. has materials with good transmittance at NIR wavelengths to cope with the development of near-infrared lenses.

The lens material and molding are selected according to the customer's application.

In addition, quality measurement equipment for NIR lenses will be completed by 2020.

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Ashton Myung Joong KIM

CEO of FresnelFactory Inc.

USA : +1 415 779 5317 

CEL : +82 10-5248-4630

Ashton@fresnelfactory.com

glassy carbon mold for glass press molding upto 2000° C

Introduces the development of glassy carbon mold, which is 99.2% carbon, capable of glass press molding with high melting point glass upto 2000 ° C.

In the past, the lens was thermoformed with low melting glass material by using DLC (Diamond-like carbon) to increase the heat resistance of the Tungsten-Carbide mold. At this time, cracks occur because the coefficient of thermal expansion of the mold and that of carbon are different.

The glassy carbon mold developed is made up of 99.2% carbon, which enables glass press molding from 800 ° to 2000 °. Therefore, high melting point glass materials (BK7, borosilicate, fused silica, etc.) can be used. It is suitable for NIR, PIR, IR laser, IR sensor which are difficult to polymer because of using high melting point glass material. Finally, copying is possible and production costs are low due to low mold costs.

The following is a comparison table.

Fresnel Factory Korea is an optical company specializing in fine patterns, developing and manufacturing precision optical lenses, Fresnel lenses, MLA and lenticular lenses and optical molds.
We recommend the suitable lens producing method and material according to the customer's application.

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Ashton Myung Joong KIM
CEO of FresnelFactory Inc.
USA : +1 415 779 5317
CEL : +82 10-5248-4630
Ashton@fresnelfactory.com

This is an example of developing Fresnel lens for Augmented Reality(AR) according to the development STEP of FresnelFactory Co., Ltd.

Proceed as follows to develop high-performance lenses quickly

1. Confirm customer requirements and set development goals

The customer had a requirement of more than Field Of View (FOV)65 while showing the AR smartphone screen clearly.

2. Check the difference between human-eye-test result and ZEMAX simulation result off-the-shelf

For AR lenses, there is a big difference in performance between ZEMAX simulation and AR lens human-eyes-test.

In order to consider the difference in performance, the difference was confirmed through the comparison between the existing AR lenses and ZEMAX simulation. 

3. To adjust Optical design by the difference from 2.

In consideration of the results of the preceding experiment at 2., we have designed the optical suitable for the customer's condition.

In addition, the amount of light from both eyes was compared because it can be dizzy due to the characteristics of AR equipment.

4. mold design and Tooling

Optical molds are produced that show excellent shaping of fine prism patterns.

5. Lens production .

The lens has beenproduced by Hotpress methodology.

(there are 4 more methodology in FresnelFactory Co., Ltd.

6. Quality check

We measured the lens performance and tested the FOV through the following measurements..

The customer was satisfied with the FOV75 and the clear image.

FresnelFactory Co., Ltd. is a Fresnel lens company that provides one-stop service for lens development.

I would like to know which point you want to check.

1. NIR Transmittance of Material
2. Verifying the optic design of the lens

For 1. We can provide a sample Fresnel lens. Even it has different Focal and size from your design.

It is specially tuned for NIR wavelength and has high hardness and heat resistance.

The sample is free, but shipping is USD 40 as DHL.

For 2. Verifying the optical design of the lens, I recommend you Hot-press sample mold.

However, we can only use optical PMMA, not NIR material that I mentioned above.

2 lenses grouped hot press mold is USD xxxx.

Provide sample is 3pcs and PMMA

If you want to check no1. And no2 at the same time, I strongly recommend you to go directly.

50lenses grouped together injection mold is USD xxxxx.

Provide sample is 10pcs with NIR high transmittance material. MOQ is 100 pcs for further production. Please discuss MOQ price later.

We need fresnel lens arrays of a specific design which we will give you the Zemax files for.

The diameter of each is xx.xxmm, and they are packed into a hexagonal array.  They are Zemax designs, but the FL is about 83mm.

We would like to a material that is pretty good in the near IR.  We do not specifically need the lenses to be Fresnel, we wanted to make the lenses thin for transmission reasons, but if you have access to a material that transmits particularly well we could just go with regular lenses.

We do not have a specific hexagonal arrangement in mind, we will tile these into a larger 2D array.  ~50 lenses grouped together would be a good number; if NRE is affected by size we could revisit that.

We would probably want to start with a lower NRE cost proof of principle which would probably be a smaller two lens array which we could use to verify the optical performance.  Once that is demonstrated we will make the full sized arrays.  If the cost of going to the full array is low enough we could consider doing that directly.

We introduce case of mold production for injection molding of ultra-small precision optical lens.

In order to make injection molding of ultra-small precision optical lens which uses five sides of hexahedron as effective lens surface, we adopt fine mold processing, Surface roughness of 50nm or less, and tunnel gate.

Hello, This is Fresnel Factory Co., Ltd.

We introduce case of mold production for injection molding of ultra-small precision optical lens.

Customer wanted to make molds for ultra-small precision optical lenses
Unlike ordinary lenses, we use 5 sides of hexahedron as the effective side, so we have processed fine molds on all sides.

In addition, for lens quality, the surface roughness is less than 50nm and the tunnel gate is used to minimize the influence of the lens surface.

<Completed mold>

Fresnel Factory Co., Ltd is a fine pattern optical company that develops and manufactures precision optical lenses, Fresnel lenses, MLA, lenticular lenses and molds.

Introducing Fresnel lens manufactured by casting mold.

While improving optical lenses to be used as 3D optical elements for TV-sized glassfree 3D optics of 55 inches in Fresnel Factory, we introduced Fresnel lenses for the first time by introducing a casting mold that improves optical characteristics for obtaining high-quality images  

Hello, This is Fresnel Factory.

Introducing Fresnel lens manufactured by casting mold.

While improving the optical lens to be used as a 3D optical element in TV-sized glassfree 3D optics of 55 inches or larger, Fresnel Factory has decided to consider a casting mold that will improve optical properties for obtaining high-quality images.

Casting is a method of making a shape by pouring a liquid material into a mold and solidifying it.

Molding method suitable for mold thickness, precision, optical improvement The Fresnel lens is mainly formed by Hotpress method, but it has a disadvantage in tolerance of thickness.

In the casting mold, the flow is good and the purity is high because the raw material, PMMA, is injected into the mold with the liquid phase.

As a result, thickness uniformity, precision, and optical characteristics of materials are relatively superior. Below is a comparison of the new casting mold and the existing Hotpress method.  

The casting mold is more suitable for production of lenses that require precise quality because it has better thickness uniformity and transmittance than Hotpress method.

Below is a sample of a Fresnel lens made by casting mold

<Fresnel lens manufactured by CASTING mold> Fresnel Factory will continue to improve the casting process starting with this development case.

The following posting will compare the properties of lenses made with casting and Hotpress.

Fresnel Factory is a Fresnel specialty optics company that proposes the right method among the six lens manufacturing methods that Fresnel Factory possesses according to the customer's application.