JPS60212704A - Reflection mirror - Google Patents

Abstract

PURPOSE:To obtain the reflectivity meeting the requirements specified in automotive standards and the spectral reflective characteristic which can decrease dazzle by laminating alternately a quarter-wave film consisting of a high refractive index material and a quarter-wave film consisting of a low refractive index material on the rear surface of a glass substrate then laminating a half-wave film consisting of a high refractive index film thereon and laminating a metallic reflecting film on the outside thereof. CONSTITUTION:A TiO2 film 2 and an SiO2 film 3 are laminated both to a quarter-wave thickness on the rear of the glass substrate 1 and thereafter a TiO2 film 4 is laminated to a half-wave thickness thereon. The metallic reflecting film 5 consisting of Cr or an alloy contg. Cr as an essential component is laminated to a suitable thickness on the outside thereof. The films 2, 4 have a high refractive index and the film 3 has a low refractive film. The reflection mirror is further provided with the film 5 and has therefore about 49% reflectivity meeting substantially the requirements specified in automotive standards and the satisfactory spectral reflecting characteristic which has a peak wavelength at about 470mmu and can decrease dazzle.

Description

[Detailed Description of the Invention] Field of Application in E & Industry] This invention relates to an anti-QA mirror suitable for example as a rearview mirror for own #JXTi.

[Prior Art] Generally, as a reflecting mirror, there is one in which a vacuum heat film of aluminum is formed on the back surface of a glass substrate and a protective coating film is applied on the outside of the film. However, this is sufficiently heavy-bearing to be used as a rearview mirror for an automobile (the automobile standard requires a reflectance of 38% or more to be 4iU).
However, since the spectral reflection characteristics are nearly flat, glare cannot be reduced, making it unsuitable for use as a rearview mirror for automobiles.

Therefore, conventionally, as shown in FIG. 1, a TiO2 film 12, S! Ox film 13 under film 3 O2 film 1
4 in sequence with a thickness of 174 wavelengths, and a light absorption device w1 on the back side of the glass substrate 11! An optical interference 3m film surface reflector with 15 is used.

However, while these conventional products have a reflectance that complies with automobile standards and a spectral reflection characteristic that has a bead wavelength around 410 mμ and can reduce glare,
Since the three-layer optical interference film 12, 13, and 14 is exposed on the surface of the glass substrate 11, it has a durable quality that prevents sand and dust from getting on it, scratches and peeling when washing the car with a brush or rubbing it. In addition, during manufacturing, after cutting, molding, and cleaning the glass, the optical interference three-layer film 12.1
Since the vacuum deposition of step 3.14 and the coating and baking of the light-absorbing coating film 15 must be performed in separate steps, there are drawbacks such as poor workability.

In order to prevent the film from peeling off due to optical interference 3FmliJ12.13.14, for example, as shown in FIG.
If layer films 12, 13, and 14 were formed, the reflectance would be lower than the IXX standard, and the
Vacuum deposition of Wd film 12.13.14 and light absorption coating film 15
This does not solve the drawback that painting and firing must be performed in separate steps.

[Object of the invention] The present invention eliminates the drawbacks of the above-mentioned conventional products, has reflectance that meets automotive standards, and spectral reflection characteristics that can reduce glare, and is easy to manufacture and durable. The purpose of this invention is to provide an excellent reflecting mirror for the general public.

[Structure of the Invention] In order to achieve the above object, the present invention alternately stacks 1/4 wavelength films made of a high refractive index material and 174 wavelength films made of a low refractive index material on the back surface of a glass substrate, and It has a structure in which a 172-wavelength film made of a high diffraction index material is laminated, and a metal anti-fouling film is laminated on the outside thereof.

[Embodiments of the invention] Embodiments of the invention shown in the drawings will be described below.

FIG. 3 shows an embodiment of the present invention, in which Ti02PIA2, SiOz1g#3@both 1
1 layer of 8I with a thickness of 74 wavelengths and 4 T i 02 films
are laminated to a thickness of 1/2 wavelength, and a metal anti-fouling film 5 made of Cr or an alloy containing Cr as a main component is laminated to an appropriate thickness on the outside thereof. Ti0z film 2.4 has a high refractive index,
In addition, the SiO2 film 3 has a low refractive index, and the metal antifouling film 5 has a low refractive index.
This reflector has a reflectance of approximately 49%, which fully complies with automobile standards, and has a peak wavelength around 470 mμ, and has good spectral reflection characteristics that can reduce glare. Moreover, this reflecting mirror has a three-layer optical interference film 2.3.
4 is not exposed on the front surface of the glass substrate 1, and there is a metal plate 1.4 on the back surface of the glass substrate 1. ) The IC is protected by the J crotch 5, so even if it gets stuck or is wiped with a brush when washing the car, the three-layer optical interference film 2.3.4
No scratches or peeling of the film. Furthermore, during manufacturing, this reflecting mirror is manufactured by cutting, molding, and cleaning glass, and after IC, optical interference of 3 m1) 2.3.
4 #3 J: Cf gold'ffs anti-h b5 can be formed by vapor deposition/=Me, workability is good, and quality can be stabilized and cost can be reduced.

Na Jj, T! Instead of the Oz film 2, a similar 174-wavelength film may be formed using ZnS or CeO2, or 5iO
A similar 174-wavelength film may be formed using tvlF instead of 2vA3, a similar 172-wavelength film may be formed using ZnS or LJ CeO2 instead of Ti021Q4, and Ni, Co or The metal anti-fouling film 5 may be formed of an alloy containing these as main components.

[Effects of the Invention] Since the present invention is configured as described above, it has sufficient reflectance to meet automobile standards and good spectral reflection characteristics that can reduce glare, and is 1131! It has good workability and can stabilize quality and reduce costs. It is also durable and can improve quality, making it suitable for automobile rearview mirrors and other uses. It is also widely applicable and has outstanding effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional device, FIG. 2 is a sectional view showing a reference example, and FIG. 3 is a sectional view showing an embodiment of the present invention. 1.11...Glass substrate, 2,12...TiOz film, 3゜13-S f O2 film, 4.14-T i 0
2 film, 5...Metal reflective film, 15...Light absorption coating film Applicant: Murakami Kaimeido Co., Ltd. Agent Asakura 1 person other than the royal family Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. 1/4 made of a high emissivity refractive index material on the back surface of the glass substrate.
A 174-wavelength film made of a low refractive index material such as a wave film is laminated alternately, and a 172-wavelength film made of an a-refractive index material is laminated one by one.
A reflecting mirror characterized by having one layer of 3I and a metal anti-QA film laminated on the outside. 2IyJik! 2. A reflecting mirror according to claim 1, wherein the high refractive index material is TiO2, ZnS or CeO2. 3. The reflecting mirror according to claim 1 JJI, wherein the low diffraction index material is made of 5tOz or MgF. 4. The reflecting mirror according to claim 1, wherein the bottom anti-tA film is made of Cr1NiSCo or an alloy containing these as main components.