CN103018796A - Double-film PC (Polycarbonate) lens for optical display and preparation method thereof - Google Patents

Abstract

The invention relates to a double-film PC lens for optical display and a preparation method thereof; it is characterized in that the PC lens is composed of three layers: a reflection film, a PC base and an anti-reflection film; wherein, the PC base is a curved lens; PC|(HL) _n H| is designed as a basic film system and coated with a reflective film, and the reflective film is deposited on the concave surface of the PC lens with a thickness of 300nm-2000nm; PC|(LH) _m L| or PC|(LH ) _m |As the basic film system, anti-reflection coating is applied, and the anti-reflection coating is deposited on the convex surface of the PC lens, with a thickness of 300nm-2000nm. The PC lens for optical display provided by the present invention has two concave and convex surfaces, the reflective film plated on the concave surface can reflect most of the visible light, and the antireflection film on the convex surface can transmit the unreflected visible light better, thereby reducing the secondary Reflection enhances the visual effect of the PC lens.

Description

A kind of double-film system PC lens for optical display and preparation method thereof

technical field

The invention belongs to the technical field of optical thin film materials, and relates to a double-film PC lens for optical display and a preparation method thereof. the

Background technique

The task of display technology is to use appropriate methods to change the intensity of light, the wavelength of light (ie color) and other characteristics of light according to the psychological and physiological characteristics of people to form different forms of visual information. In terms of military use, the head-up display is a kind of flight auxiliary display instrument commonly used on aircraft. The working principle of the head-up display is closely related to the film on the surface of the display. Foreign countries have not stopped research on the head-up display. The purpose is to develop a display with higher clarity, reliability and resolution, longer life, and higher cost performance. Coating on the display can improve the visual performance of the display. In a complex environment, it can help soldiers gain a preemptive advantage or better grasp the changing battle situation on the battlefield. the

The working principle of the display screen of the head-up display is to reflect the green spectrum emitted by the internal instruments back to the pilot's eyes, and the pilot can clearly see the green graphic data on the screen. Traditional head-up displays use glass as the display screen. Although the optical performance of the glass screen is relatively excellent, its mechanical performance cannot be well adapted to the special environment. the

PC material has good transparency and visibility, and is suitable as an optical display lens in terms of optical and mechanical properties, and has great application prospects in display components. At present, foreign research on the application of optical display films on the surface of PC materials is relatively mature, and many companies have been able to produce series products. GE Advanced Materials Group recently launched a new type of polycarbonate (PC) resin as raw material. Optical display film—LEXAN ILLUMINEX ^TM film, the product has excellent optical characteristics, and the quality and performance of the film have reached an unprecedented high level, but there are no related reports about it being used as a surface medium for display. In China, thin-film materials started late, and there are relatively few related researches on PC surface coating by vacuum coating, but related research and development work is also actively carried out. Zhang Qitu et al. (Composite multi-band laser protection PC material [J]. Laser and Infrared, 2008, 38(5): 421-423.) developed a composite PC coating material with specific visible light band absorption characteristics for laser protection , but there is no relevant information in the relevant domestic fields on the PC display mirror plated reflective film.

Contents of the invention

The object of the present invention is to provide a dual-film PC lens for optical display in order to improve the deficiencies of the prior art. Another object of the present invention is to provide a method for preparing the above-mentioned dual-film PC lens for optical display. Using polycarbonate (PC) as the matrix, HfO ₂ and SiO ₂ as high and low refractive index film materials, a dual-film PC lens for optical display is prepared. The prepared dual-film PC lens for optical display can meet the requirements of the head-up display screen. skills requirement.

The technical solution of the present invention is: a dual-film PC lens for optical display, characterized in that the PC lens is composed of three layers of reflective film, PC base and anti-reflection film in sequence; wherein, the PC (polycarbonate) base is a piece with Curved lens; the reflective film is deposited on the concave surface of the PC lens, and its thickness is 300nm-2000nm; the antireflection film is deposited on the convex surface of the PC lens, and its thickness is 300nm-2000nm. the

Preferably, the reflective film is a thin film formed by alternately stacking high and low refractive index materials, and the reflectivity in the visible light band (400-700nm) is 60%-100%; The formed film has a reflectance of 0.01%-5% in the visible light band (400-700nm); the polycarbonate (PC) substrate has a visible light band (400-700nm) transmittance of 80%-98%, and is resistant to bending The strength is 100MPa-200MPa; the low refraction material is SiO ₂ or MgF ₂ , and the high refraction material is HfO ₂ or ZrO ₂ .

The present invention also provides the method for the above-mentioned dual-film PC lens for optical display, and its specific steps are as follows:

(1) Preparation of reflective film: On the concave surface of the PC substrate, PC|(HL) _n H| is used as the design of the basic film system to coat the reflective film, and the total thickness of the reflective film is controlled to be 300nm-2000nm; where H stands for high refraction HfO ₂ or ZrO ₂ , L represents low refractive index material SiO ₂ or MgF ₂ , n represents the alternating period of high and low refractive index materials, n=1~5; the physical thickness of each layer of high refractive index material is 50nm~100nm, The physical thickness of each layer of low refractive index material is 250nm~350nm;

(2) Preparation of anti-reflection coating: on the convex surface of the PC substrate coated with a reflective film on the concave surface, PC|(LH) _m L| or PC|(LH) _m | is used as the design of the basic film system to coat the anti-reflection coating. Control the total thickness of the anti-reflection coating to 300nm-2000nm; where H represents the high refractive index material HfO ₂ or ZrO ₂ , L represents the low refractive index material SiO ₂ or MgF ₂ , m represents the alternating period of high and low refractive index materials, m=1 ~8; The specific physical thickness of a thin film (single-layer thin film) formed by alternately stacking low and high refractive index materials is 10nm-500nm; a double-film PC lens for optical display is produced.

The coatings in the above steps (1) and (2) all adopt the method of ion-assisted deposition and electron beam vacuum coating; wherein the coating vacuum is 0.001Pa~0.003Pa, and the coating temperature is: 50°C~80°C. the

Beneficial effect:

The PC lens for optical display provided by the present invention has two concave and convex surfaces, the reflective film plated on the concave surface can reflect most of the visible light, and the antireflection film on the convex surface can transmit the unreflected visible light better, thereby reducing the secondary Reflection enhances the visual effect of the PC lens. the

Detailed ways

Below in conjunction with example the present invention is further described, but should not limit protection scope of the present invention with this. The coatings of the following examples all adopt the methods of ion-assisted deposition and electron beam vacuum coating;

Example 1 ^#

Based on PC, the reflective film adopts a film structure of (HL)^1H with a total of 3 layers. (Wherein, (HL)^1H means: the first layer of each period is a high refractive index material HfO ₂ with a thickness of 1 optical thickness, and the second layer is a low refractive material SiO ₂ with a thickness of 3 optical thicknesses, a total of one The cycle ends with _HfO2 , a high refractive index material; the coating temperature is 50°C, and the coating pressure is 0.001MPa;

The anti-reflection coating adopts a film structure Sub|LHL| with a total of 3 layers. (Where, Sub|LHL|A means: the first layer of each cycle is low refractive index material SiO ₂ , the second layer is high refractive index material HfO ₂ , and finally ends with L low refractive index material SiO ₂ ; coating temperature is 50°C , the coating pressure is 0.002MPa;

Table 1 The refractive index and thickness of each layer of the three-layer reflective film

Only the reflection spectrum of the PC lens concave surface coated with reflective film was tested, and the highest reflectance of the reflection curve of the PC coated reflective film reached 65%. the

Table 2 The refractive index and thickness of each layer of the three-layer AR coating

Only the reflection spectrum of the anti-reflection coating on the convex surface of the PC lens was tested. The highest reflectance of the reflection curve of the anti-reflection coating after PC coating does not exceed 2.8%, and the average distribution is about 2.5%. the

After coating the concave and convex surface of the PC lens with reflective coating and anti-reflection coating at the same time, the reflection spectrum test shows that the reflectance curve of the lens reaches 63.2%, which is 1.8% lower than that of the lens without anti-reflection coating, which effectively reduces the The secondary reflection caused by the mirror when reflecting the spectrum. the

Example 2 ^#

Based on PC, the reflective film adopts a film structure of (HL)^2H with a total of 5 layers. The coating temperature is 80°C, and the coating pressure is 0.003MPa;

The AR coating adopts a film structure Sub|LHLHLHL|A with a total of 7 layers; the coating temperature is 50°C, and the coating pressure is 0.003MPa;

Table 3 The refractive index and thickness of each film layer of the five-layer film

Only the reflection spectrum of the PC lens concave surface coated with reflective film was tested, and the highest reflectance of the reflection curve of the PC coated reflective film reached about 72%. the

Table 4 The refractive index and thickness of each layer of the seven-layer anti-reflection coating

Only the reflection spectrum of the anti-reflection coating on the convex surface of the PC lens was tested. The highest reflectance of the reflection curve of the anti-reflection coating before and after PC coating does not exceed 1%, and the average distribution is 0.8%. the

After coating the concave and convex surface of the PC lens with reflective coating and anti-reflection coating at the same time, the reflectance spectrum test was carried out. The reflectivity curve of the lens reached 70.7%, which was 1.3% lower than that of the lens without anti-reflection coating, which effectively reduced the The secondary reflection caused by the mirror when reflecting the spectrum. the

Example 3 ^#

With PC as the substrate, the reflective film adopts a film structure of (HL)^5H with a total of 11 layers; the coating temperature is 80°C, and the coating pressure is 0.001MPa;

The anti-reflection coating adopts a film structure Sub|LHL|A with a total of 3 layers; the coating temperature is 80°C, and the coating pressure is 0.001MPa;

Table 5 Refractive index and thickness of each film layer of seven-layer film

Only the reflection spectrum of the anti-reflection coating on the convex surface of the PC lens was tested, and the highest reflectance of the reflection curve of the reflection film after PC coating reached about 85%. the

Table 6 The refractive index and thickness of each layer of the three-layer anti-reflection coating

Only the reflection spectrum of the anti-reflection coating on the convex surface of the PC lens was tested. The highest reflectance of the reflection curve of the anti-reflection coating before and after PC coating does not exceed 2.8%, and the average distribution is about 2.5%. the

After coating the concave and convex surface of the PC lens with reflective coating and anti-reflection coating at the same time, the reflectance spectrum test is carried out. The reflectivity curve of the lens reaches 83%, which is 2% lower than that of the lens without anti-reflection coating, which effectively reduces the The secondary reflection caused by the mirror when reflecting the spectrum. the

The above-mentioned examples are all preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned examples, and any other modifications, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention are all Equivalent replacement methods are all included in the protection scope of the present invention. the

Claims (4)

1. an optics shows that with pair films be the PC eyeglass, it is characterized in that the PC eyeglass is comprised of three layers of reflectance coating, PC substrate and anti-reflection films successively; Wherein, the PC substrate is an eyeglass that radian is arranged; Reflectance coating is deposited on the concave surface of PC eyeglass, and its thickness is 300nm-2000nm; Anti-reflection film is deposited on the convex surface of PC eyeglass, and its thickness is 300nm-2000nm.

2. optics according to claim 1 shows that with two films be the PC eyeglass, it is characterized in that described reflectance coating is the film that high low-index material alternately is formed by stacking, at the reflectivity 60%-100% of visible light wave range; The film that described anti-reflection film alternately is formed by stacking for low high-index material is at the reflectivity 0.01%-5% of visible light wave range; Described PC substrate is visible light wave range transmitance 80%-98%, bending strength 100MPa-200MPa; Wherein low refractive material is SiO ₂Or MgF ₂, high-refraction material is HfO ₂Or ZrO ₂

3. one kind prepares optics as claimed in claim 1 and shows that with two films be the method for PC eyeglass, and its concrete steps are as follows:

(1) preparation of reflectance coating: at the concave surface of PC substrate, adopt PC| (HL) _nH| plates reflectance coating as the design of underlying membrane system, and the gross thickness of control reflectance coating is 300nm-2000nm; Wherein H represents high-index material HfO ₂Or ZrO ₂, L represents low-index material SiO ₂Or MgF ₂, n represents the cycle that high low-index material replaces, n=1 ~ 5; The physical thickness of every floor height refraction materials is 50nm ~ 100nm, the physical thickness 250nm ~ 350nm of every layer of low-index material;

(2) preparation of anti-reflection film: plate the convex surface of the PC substrate of reflectance coating at concave surface, adopt PC| (LH) _mL| or PC| (LH) _m| the design as underlying membrane system plates anti-reflection film, and the gross thickness of control anti-reflection film is 300nm-2000nm; Wherein H represents high-index material HfO ₂Or ZrO ₂, L represents low-index material SiO ₂Or MgF ₂, m represents the cycle that high low-index material replaces, m=1 ~ 8; The concrete physical thickness 10nm-500nm of the thin film that low high-index material alternately is formed by stacking; Make optics and show that with two films be the PC eyeglass.

4. method according to claim 3 is characterized in that plated film in step (1) and (2) all adopts the method for ion assisted deposition and Electron beam evaporation; Plated film vacuum tightness 0.001Pa ~ 0.003Pa wherein, coating temperature is: 50 ℃ ~ 80 ℃.