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Lens reflectivity measuring method and device

A measurement method and measurement device technology, applied in the field of optical measurement, can solve the problems that the size of the fixture cannot be made too large, cannot be reused, and the plate is damaged, and achieve the effect of ingenious design, simple structure and high precision

Active Publication Date: 2019-12-06
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method will still have a small amount of diffuse reflection light to reach the receiver, and the process is more complicated, which will cause certain damage to the plated sheet and cannot be reused; the second method is limited by the size of the fixture in the coating process and cannot be done. is very large, so it is difficult to implement

Method used

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  • Lens reflectivity measuring method and device
  • Lens reflectivity measuring method and device
  • Lens reflectivity measuring method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to attached figure 2 And attached image 3 , a method for measuring the reflectivity of a lens, particularly for detecting the method for measuring the reflectivity of a lens used in imaging devices such as AR or VR, comprising the following steps:

[0034] S1: select the plated sheet with the same film system as the lens to be tested;

[0035] Install the fixture in the test light path of the spectrophotometer;

[0036] Place the prepared refractive index matching solution between the plated sheet and the flat glass, and make sure that no air bubbles exist between the plated sheet and the flat glass, then fix the plated plate and the flat glass on the upper end of the fixture, and then Plated sheet, refractive index matching liquid and flat glass form the composition to be tested;

[0037] Adjust the rotation direction of the fixture so that the incident light emitted by the light source of the spectrophotometer is reflected and received by the receiver o...

Embodiment 2

[0048] Such as figure 2 As shown, a device for measuring lens reflectivity includes a spectrophotometer, a refractive index matching liquid, flat glass and a jig;

[0049] The coated sheet has the same film system as the lens to be tested;

[0050] The spectrophotometer includes a light source and a receiver, the light source is used to emit incident light, and the receiver is used to receive outgoing light reflected and refracted by the sample to be measured;

[0051] The fixture is installed in the test light path of the spectrophotometer, and is used to fix the plated sheet and flat glass;

[0052] The refractive index matching liquid is arranged between the plated plate and the flat glass.

[0053] The refractive index of the refractive index matching liquid is the same or close to that of the plated sheet.

[0054] The refractive index matching liquid is a liquid with a specific refractive index, and it is prepared from liquids with different components. According to ...

Embodiment 3

[0068] Taking the lens used in a VR product as an example, the lens material is EP6000, the thickness of the coating is 3mm, and the refractive index is n s =1.64, the refractive index of the selected refractive index matching liquid is n l =1.63, the maximum reflection angle that needs to be tested is θ=75 °, flat glass is the same as plated sheet material, and thickness is 18mm, by the measurement method in the embodiment 1 and the measuring device in the embodiment 2, this mirror reflectance is carried out Measurement, set as the experimental group;

[0069] Similarly, taking the lens used in a VR product as an example, the material of the lens is EP6000, the thickness of the coating is 3mm, and the refractive index is n s =1.64, the maximum reflection angle to be tested is θ=75°, and the reflectance of the lens is measured at a single degree in the prior art, without refractive index matching liquid and flat glass, as a control group;

[0070] Experimental group measurem...

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Abstract

The invention discloses a lens reflectivity measuring method and device. The method comprises the following steps: putting a to-be-detected composition which is at least composed of a plating accompanying sheet, plate glass and refractive index matching liquid positioned between the plate glass and the plating accompanying sheet into a light path of a spectrophotometer to make incident light emitted by a light source of the spectrophotometer received by a receiver of the spectrophotometer after the incident light is reflected and refracted by the to-be-detected composition; turning on the light source of the spectrophotometer, wherein the incident light emitted by the light source is reflected and refracted by the to-be-detected composition to form emergent light, and the emergent light received by the receiver comprises three paths of light; and measuring light intensity of the emergent light received by the receiver, measuring light intensity of the incident light emitted by the light source, and calculating the ratio of the light intensity value of the emergent light to the light intensity value of the incident light, so that the reflectivity of the plating accompanying sheet isobtained. The device realizes accurate measurement of the reflectivity of the lens, is high in precision, simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a method and a measurement device for measuring the reflectivity of a lens. Background technique [0002] Optical lenses generally used in VR products have a larger field of view to obtain a better sense of immersion and user experience. Therefore, in the reflectivity test of optical lenses, it is particularly important to test the reflectivity of large angles. The surface of optical lenses is generally Coated with a film system, the reflectivity of the film system is generally used as the reflectivity of the optical lens. A spectrophotometer is generally used as a test instrument for large-angle reflectivity. The light with a certain cone angle emitted from the light source is reflected by the surface of the sample to be tested and then enters the detector window. The minimum included angle between the outgoing light path and the receiver light path is required to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/0228
Inventor 董会庞博
Owner GOERTEK OPTICAL TECH CO LTD
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