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Processing method of Fresnel lens

A Fresnel lens and processing method technology, applied in the field of Fresnel lens processing, can solve the problems of high reject rate, incapable of mass production, and unsaturated flashing

Inactive Publication Date: 2017-07-18
联钢精密科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Processing lenses by injection molding method can generally process lenses with a thickness of 0.5mm, but if the lens is processed by injection molding less than 0.5mm, it is prone to poor appearance, unsaturated flashes and other phenomena are prone to occur during injection molding, the scrap rate is high, and it cannot be processed. mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A processing method for a Fresnel lens, comprising the steps of:

[0038] Step 1: Making a silicone mold mainly includes the following steps:

[0039] S1: Clean the jig, clean the finished jig and keep the surface clean;

[0040] S2: preparing silica gel, mixing silica gel and curing agent at a ratio of 15:1 to obtain mixed silica gel, and stirring for 2 to 5 minutes;

[0041] S3: Jig filling, fill the mixed silica gel into the jig, and keep it at a vacuum pressure of 2mmHg for 5 minutes;

[0042] S4: sealing the jig, sealing the jig filled with mixed silica gel, and baking in an oven at 200°C for 10 minutes to obtain a silicone mold;

[0043] Step 2: Add UV photocurable silica gel to the prepared silica gel mold and put it into the UV equipment. The temperature of the UV equipment is kept at 25°C and the air pressure is 0.25MPa;

[0044] Step 3: Forming by UV irradiation, keep the silicone mold after adding UV light-cured silicone in an environment with a vacuum pre...

Embodiment 2

[0047] A processing method for a Fresnel lens, comprising the steps of:

[0048] Step 1: Making a silicone mold mainly includes the following steps:

[0049] S1: Clean the jig, clean the finished jig and keep the surface clean;

[0050] S2: preparing silica gel, mixing silica gel and curing agent at a ratio of 25:1 to obtain mixed silica gel, and stirring for 2 to 5 minutes;

[0051] S3: Filling the jig, filling the mixed silica gel into the jig, and keeping it at a vacuum pressure of 5mmHg for 8 minutes;

[0052] S4: sealing the jig, sealing the jig filled with mixed silica gel, and baking in an oven at 250°C for 20 minutes to obtain a silicone mold;

[0053] Step 2: Add UV photocurable silica gel to the prepared silica gel mold and put it into the UV equipment. The temperature of the UV equipment is kept at 30°C and the air pressure is 0.35MPa;

[0054] Step 3: UV irradiation molding, the silicone mold after adding UV light-cured silicone is kept for 10 minutes in an envi...

Embodiment 3

[0057] A processing method for a Fresnel lens, comprising the steps of:

[0058] Step 1: Making a silicone mold mainly includes the following steps:

[0059] S1: Clean the jig, clean the finished jig and keep the surface clean;

[0060] S2: preparing silica gel, mixing silica gel and curing agent at a ratio of 20:1 to obtain mixed silica gel, and stirring for 2 minutes;

[0061] S3: Jig filling, fill the mixed silica gel into the jig, and keep it at a vacuum pressure of 2mmHg for 5 minutes;

[0062] S4: sealing the jig, sealing the jig filled with mixed silica gel, and baking in an oven at 220°C for 10 minutes to obtain a silicone mold;

[0063] Step 2: Add UV photocurable silica gel to the prepared silica gel mold and put it into the UV equipment. The temperature of the UV equipment is kept at 28°C and the air pressure is 0.3MPa;

[0064] Step 3: UV irradiation molding, the silicone mold after adding UV light-cured silicone is kept for 5 minutes in an environment with a va...

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Abstract

The invention discloses a processing method of a Fresnel lens. The method comprises following steps: firstly, a silicone mould is manufactured and mainly comprises following sub steps of S1, jig cleaning, S2, silicon blending, S3, jig filling, S4, jig seal and obtaining the silicone mould; secondly, UV photocured silicone is added, and is put into a UV device, and the temperature of the UV device is kept to range from 25 DEG C to 30 DEG C, and the air pressure ranges from 0.25 MPa to 0.35 MPa; thirdly, UV irradiation molding is carried out, and under the environment with the vacuum air pressure ranging from 2 mmHg to 5 mmHg, and the temperature ranges from 180 DEG C to 220 DEG C, and UV irradiation molding is kept for 5 minutes to 10 minutes; fourthly, the manufactured Fresnel lens is taken out. The processing method has the beneficial effects that the UV curing method is used, the lens is cured to be in solid state from the liquid state, the thickness of the formed lens can be about 0.2 mm, large-batch production can be carried out, phenomena of insufficient punching, trimmings and the like during injection molding can be avoided, the machined lens is in order in appearance, the rejection rate is greatly reduced, and the production cost is further reduced.

Description

technical field [0001] The invention relates to the field of lens processing, in particular to a method for processing a Fresnel lens. Background technique [0002] At present, the mobile phone camera is one of the necessary functions of the mobile phone. People have higher and higher requirements for the quality of the picture taken, which puts forward higher requirements for the pixels of the camera. Correspondingly, the thickness will become thinner and thinner to meet the needs of mobile phone assembly thickness. However, single or double lamps are currently used, and the thickness is generally above 0.5mm. With the demand for thinner and thinner mobile phones, the thickness of the lampshade It needs to be about 0.2mm-0.3mm, which requires the thickness of the lens to be about 0.2mm. [0003] Processing lenses by injection molding method can generally process lenses with a thickness of 0.5mm, but if the lens is processed by injection molding less than 0.5mm, it is prone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/40B29C35/08B29L11/00
CPCB29C33/405B29C33/3842B29C35/0805B29C2035/0827B29L2011/005
Inventor 凌卫锋
Owner 联钢精密科技(苏州)有限公司