CN111854982A - Interferometer for measuring transmission wavefront of ink hole of mobile phone panel - Google Patents
Interferometer for measuring transmission wavefront of ink hole of mobile phone panel Download PDFInfo
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- CN111854982A CN111854982A CN202010863730.XA CN202010863730A CN111854982A CN 111854982 A CN111854982 A CN 111854982A CN 202010863730 A CN202010863730 A CN 202010863730A CN 111854982 A CN111854982 A CN 111854982A
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- interferometer
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- light source
- ink hole
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000003708 edge detection Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J2009/002—Wavefront phase distribution
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses an interferometer for measuring the transmission wavefront of an ink hole of a mobile phone panel, which comprises a base and an industrial personal computer arranged on the base; the base is provided with a light path structure and a light source structure corresponding to the light path structure; a camera is mounted on the base; the light path structure comprises light source equipment and a reflection reference mirror corresponding to the light source equipment; a collecting mirror, a beam splitter prism, a quarter-wave plate, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and an optical filter and a second collimating mirror are arranged between the lens of the camera and the beam splitting prism. The test wavelength of the interferometer is completely consistent with the design wavelength of the ink hole of the mobile phone panel, and the measurement result can correctly evaluate the production quality of the ink hole.
Description
Technical Field
The invention relates to the field of interferometers, in particular to an interferometer for measuring the transmission wavefront of an ink hole of a mobile phone panel.
Background
With the continuous upgrade of the biometric identification technology and the camera shooting function of the smart phone, the 3D structured light system and the TOF camera gradually become the technical bright spots of the flagship mobile phone. A940 nm light source and a collecting camera are installed inside the mobile phone, a projecting window and a collecting window are arranged at the corresponding positions of a mobile phone panel, and special ink coatings are arranged on the surfaces of the windows to form ink holes which can be penetrated by near infrared light beams and isolate visible light. The transmitted wave front of the ink hole can affect the accuracy of biological identification, and accurate measurement becomes a new issue.
Conventional laser interferometers are in the visible wavelength band, with a typical wavelength of 632.8 nm. This band cannot penetrate the ink hole and cannot complete the measurement of the transmitted wavefront of the ink hole.
Laser interferometers with near infrared wavelength have only 1053nm or 1064nm wavelength at present. This wavelength can penetrate the ink orifice and complete the measurement of its transmitted wavefront. However, the design wavelength of the ink hole of the mobile phone panel is 940nm, and under the wavelength of 1053nm, although a light beam can penetrate through the ink hole, the transmittance, the scattering and the characteristics of other ink particles can have great differences, and the characteristics under the 940nm wave band cannot be truly reflected and the production quality of the ink hole can not be accurately evaluated by measuring with 1053nm laser and then simply converting numerical values.
At present, the wavelength of output laser of a common visible light laser interferometer is 632.8nm (or other similar wavelengths), and light beams in the wave band cannot pass through the ink hole, so that the measurement of the transmitted wavefront of the ink hole cannot be realized.
At present, the output laser wavelength of a common near-infrared laser interferometer is 1053nm (or other similar wavelengths), light beams with the wavelength can pass through the ink hole but are not consistent with the design waveband of the ink hole, and simple numerical conversion is carried out after measurement, so that partial characteristics of the ink hole in an actual use scene cannot be accurately reflected.
In view of this, it is an urgent need to solve the problem of the technical staff in the art to develop an interferometer for measuring the transmission wavefront of the ink hole of the mobile phone panel, and the measurement result can correctly evaluate the production quality of the ink hole and maximize the profit.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an interferometer for measuring the transmission wavefront of the ink hole of the mobile phone panel, and solves the defects of the technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
an interferometer for measuring the wave front transmitted by an ink hole of a mobile phone panel comprises a base and an industrial personal computer arranged on the base; the method is characterized in that: the base is provided with a camera, and the camera is connected with an industrial personal computer; the base is provided with light source equipment and a reflection reference mirror corresponding to the light source equipment; a collecting mirror, a beam splitter prism, a quarter-wave plate, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and an optical filter and a second collimating mirror are arranged between the lens of the camera and the beam splitting prism.
In an optimized scheme, the light source equipment adopts a laser with 940nm wavelength output.
According to the optimized scheme, 940nm narrow-band antireflection films are plated on the outer surfaces of the collecting mirror, the beam splitter prism, the quarter-wave plate, the first collimating mirror, the transmission reference mirror and the reflection reference mirror.
According to the optimized scheme, 940nm narrow-band antireflection films are plated on the outer surfaces of the optical filter and the second collimating mirror.
In an optimized scheme, a 940nm narrow-band filter is adopted as the filter.
Due to the adoption of the technology, compared with the prior art, the invention has the beneficial effects that:
1. the test wavelength of the interferometer is completely consistent with the design wavelength of the ink hole of the mobile phone panel, and the measurement result can correctly evaluate the production quality of the ink hole.
2. The 4f image transmission system formed by the first collimating mirror and the second collimating mirror adopts the structural design of object space telecentricity, and can ensure that the edge detection can be correctly realized when ink accumulation exists at the boundary of an ink hole.
3. According to the invention, the response curve of the camera is higher in visible light wave band response rate and lower in near infrared wave band response rate, and a 940nm narrow-band filter is placed at the front end of the camera to avoid the influence of stray light.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in FIG. 1, the interferometer for measuring the wave front transmitted by the ink hole of the mobile phone panel comprises a base and an industrial personal computer installed on the base. Base and industrial computer belong to interferometer's conventional configuration, and this patent also adopts current product. This part is known in the art and therefore will not be described in detail in order to understand the structure, principle and connection relationship.
The base is provided with a camera, and the camera is connected with an industrial personal computer. The camera is also a purchased product, belongs to the prior art, and can be grasped by a person skilled in the art, so the structure, the principle and the connection relationship are not described in detail.
The optical path structure includes the light source device 1 and a reflection reference mirror 11 corresponding to the light source device. A collecting mirror 2, a beam splitter prism 3, a quarter wave plate 7, a first collimating mirror 8 and a transmission reference mirror 9 are sequentially arranged between the light source device 1 and the reflection reference mirror 11. The handset panel ink hole 10 to be detected is placed at a position between the transmissive reference mirror 9 and the reflective reference mirror 11. The other side position on the beam splitting prism 3 corresponds to a camera 6, and a light filter 5 and a second collimating mirror 4 are arranged between the lens of the camera 6 and the beam splitting prism 3.
The light source device employs a laser of 940nm wavelength output, taking into account the parameters of the handset panel ink well 10. 940nm narrow-band antireflection films are plated on the outer surfaces of the collecting mirror, the beam splitter prism, the quarter-wave plate, the first collimating mirror, the transmission reference mirror and the reflection reference mirror. And 940nm narrow-band antireflection films are plated on the outer surfaces of the optical filter and the second collimating mirror. The filter adopts a 940nm narrow-band filter. The beam splitter prism 3 is a polarization beam splitter prism.
In the embodiment, the laser emitted by the interferometer is 940nm, which is completely consistent with the design waveband of the mobile phone panel ink hole. The main light path of the interferometer adopts the structural design of object space telecentric, and the edge detection can be correctly realized when ink accumulation exists at the boundary of the ink hole. The optical elements are specially coated at 940nm, so that the influence of stray light is eliminated.
The test wavelength of the interferometer is completely consistent with the design wavelength of the ink hole of the mobile phone panel, and the measurement result can correctly evaluate the production quality of the ink hole.
The 4f image transmission system formed by the first collimating mirror and the second collimating mirror adopts the structural design of object space telecentricity, and can ensure that the edge detection can be correctly realized when ink accumulation exists at the boundary of an ink hole.
According to the invention, the response curve of the camera is higher in visible light wave band response rate and lower in near infrared wave band response rate, and a 940nm narrow-band filter is placed at the front end of the camera to avoid the influence of stray light.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. An interferometer for measuring the wave front transmitted by an ink hole of a mobile phone panel comprises a base and an industrial personal computer arranged on the base;
the method is characterized in that:
the base is provided with a camera, and the camera is connected with an industrial personal computer;
the base is provided with light source equipment and a reflection reference mirror corresponding to the light source equipment; a collecting mirror, a beam splitter prism, a quarter-wave plate, a first collimating mirror and a transmission reference mirror are sequentially arranged between the light source equipment and the reflection reference mirror; the other side position on the beam splitting prism corresponds to the camera, and an optical filter and a second collimating mirror are arranged between the lens of the camera and the beam splitting prism.
2. The interferometer for measuring the transmitted wavefront of an ink hole of a mobile phone panel according to claim 1, wherein: the light source equipment adopts a laser with 940nm wavelength output.
3. The interferometer of claim 2, wherein: 940nm narrow-band antireflection films are plated on the outer surfaces of the collecting mirror, the beam splitter prism, the quarter-wave plate, the first collimating mirror, the transmission reference mirror and the reflection reference mirror.
4. The interferometer of claim 3, wherein: and 940nm narrow-band antireflection films are plated on the outer surfaces of the optical filter and the second collimating mirror.
5. The interferometer of claim 4, wherein: the filter adopts a 940nm narrow-band filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863730.XA CN111854982A (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring transmission wavefront of ink hole of mobile phone panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863730.XA CN111854982A (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring transmission wavefront of ink hole of mobile phone panel |
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| CN111854982A true CN111854982A (en) | 2020-10-30 |
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| CN202010863730.XA Pending CN111854982A (en) | 2020-08-25 | 2020-08-25 | Interferometer for measuring transmission wavefront of ink hole of mobile phone panel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05164991A (en) * | 1991-12-17 | 1993-06-29 | Fuji Photo Optical Co Ltd | Interferometer device |
| US20080062428A1 (en) * | 2006-09-07 | 2008-03-13 | 4D Technology Corporation | Synchronous frequency-shift mechanism in Fizeau interferometer |
| CN104315971A (en) * | 2014-10-30 | 2015-01-28 | 中国科学院长春光学精密机械与物理研究所 | Dual-wavelength Fizeau laser interferometer |
| US20180328711A1 (en) * | 2015-11-12 | 2018-11-15 | Universitaet Stuttgart | Interferometer using tilted object waves and comprising a fizeau interferometer objective |
| CN109029244A (en) * | 2018-07-10 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Multiwavelength laser interferometer |
| CN211291335U (en) * | 2019-12-24 | 2020-08-18 | 常州光波远见科技有限公司 | Dual-wavelength laser interferometer |
| CN212378916U (en) * | 2020-08-25 | 2021-01-19 | 上海乾曜光学科技有限公司 | Interferometer for measuring transmission wavefront of ink hole of mobile phone panel |
-
2020
- 2020-08-25 CN CN202010863730.XA patent/CN111854982A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05164991A (en) * | 1991-12-17 | 1993-06-29 | Fuji Photo Optical Co Ltd | Interferometer device |
| US20080062428A1 (en) * | 2006-09-07 | 2008-03-13 | 4D Technology Corporation | Synchronous frequency-shift mechanism in Fizeau interferometer |
| CN104315971A (en) * | 2014-10-30 | 2015-01-28 | 中国科学院长春光学精密机械与物理研究所 | Dual-wavelength Fizeau laser interferometer |
| US20180328711A1 (en) * | 2015-11-12 | 2018-11-15 | Universitaet Stuttgart | Interferometer using tilted object waves and comprising a fizeau interferometer objective |
| CN109029244A (en) * | 2018-07-10 | 2018-12-18 | 中国科学院上海光学精密机械研究所 | Multiwavelength laser interferometer |
| CN211291335U (en) * | 2019-12-24 | 2020-08-18 | 常州光波远见科技有限公司 | Dual-wavelength laser interferometer |
| CN212378916U (en) * | 2020-08-25 | 2021-01-19 | 上海乾曜光学科技有限公司 | Interferometer for measuring transmission wavefront of ink hole of mobile phone panel |
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