TW201518763A - Composite filter element - Google Patents

Abstract

Disclosed is a composite filter element in which a Reflection and/or absorption IR material layer is formed on a surface of a transparent substrate. The Reflection and/or absorption IR material layer can be used for reflecting and/or absorbing Infrared light, and boost visible light transmittance of the transparent substrate; the Reflection and/or absorption IR material layer comprises a reflection interference Infrared light cut-off filter (IRCF) film and an Infrared light absorption material layer, that are stacked on the transparent substrate in order or disorder, or are stacked on the same side and/or another side of the transparent substrate. Accordingly, the formed composite filter element is provided at front end of an image photoreceptor so as to avoid generation of glare and/or ghost image. The transparent substrate can be made thinly or entirely excluded so that thickness of packaging size can be reduced.

Description

Composite filter element

The invention relates to a composite filter element, in particular to a composite filter element used for a high-order image lens, which is coated on a surface of a transparent substrate with a reflective dry material and/or an infrared absorption material layer (Reflection absorption material). ) formed by.

A general photographic lens is provided with a plurality of optical lenses, filters, and image sensors inside a lens holder. In the case of a digital camera, the filter is a infrared cut filter that mainly filters infrared rays. (Infrared cut filter, IRCF), to correct the color shift phenomenon of the image sensor by preventing infrared rays from being image sensor (Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (CMOS)).

The conventional filter is coated with a layer of infrared (IR) film for reflecting infrared rays (wavelengths of 700 nm to 1200 nm) on the surface of a glass material, and the infrared rays pass through the infrared rays (IR). After the film is reflected, reflection and refraction are repeated between most of the optical lenses, and because the infrared (IR) film does not reflect all of the infrared rays, some of the infrared rays still pass through the filter, so that when the image sensor senses When it comes to infrared light, it will produce images such as glare and ghosts. For this reason, blue glass that can be used to absorb infrared rays is Gradually use.

Blue glass is characterized by a high transmittance of blue wavelength and a low transmittance to red-orange wavelengths, and is used for optical instruments that require correction of color, blue color, or use for low reflection. The general blue glass filter is made by adding iron, nickel and other formulas to the glass raw material, and then melting into glass bricks, and then being processed by cutting, grinding and polishing processes, which absorbs light by using the material of the glass itself, thereby achieving No penetration.

However, since the blue glass is made by mixing other materials into the glass raw material, the thickness cannot be made very thin, mostly between 0.3 mm (mm) and 1 mm (mm), and because the material itself is water vapor. It absorbs severely and can only withstand temperatures of around 120 degrees Celsius (°C). Therefore, there is still room for improvement in material reliability and the trend toward thin mobile devices.

In view of this, the research and development team of the applicant of this case is aimed at improving the lack of research, and the invention is produced by long-term research.

Accordingly, the present invention is directed to providing a composite filter element such that, under the optical characteristics of the same blue glass, the thickness of the filter element can still be ultra-thin (total thickness <0.3 mm).

The composite filter element according to the present invention is characterized in that a surface of the transparent substrate is coated with a reflection and/or absorption IR material to form a filter element having blue glass characteristics. The second object of the present invention.

The composite filter element according to the present invention, which comprises a reflection and/or absorption IR material formed on the surface of the transparent substrate, and includes a reflective interference type infrared cut filter (IRCF) film. And an infrared light absorbing material layer, so that the infrared light can be completely intercepted, so that the interference of the infrared light on the image sensor is minimized, which is another object of the present invention.

According to the composite filter element of the present invention, since the reflection dry//or absorption IR material constituting the blue glass characteristic is formed on the surface of the transparent substrate, it is not mixed in the transparent substrate. Therefore, the thickness of the transparent substrate can be made very thin (total thickness <0.3 mm) to meet the requirements of thinning, which is another object of the present invention.

According to the composite filter element of the present invention, since the reflection dry//or absorption IR material constituting the blue glass characteristic is formed on the surface of the transparent substrate, it is not mixed in the transparent substrate. It is another object of the present invention to avoid the material itself being cracked by moisture absorption to achieve high reliability requirements.

As for the detailed construction, application principle, function and effect of the present invention, please refer to the following description according to the drawings to obtain a complete understanding.

100‧‧‧Composite filter elements

200‧‧‧Transparent substrate

21‧‧‧ upper surface

22‧‧‧ Lower surface

300‧‧‧Reflective material layer

301‧‧‧ Reflection Interferometric Infrared Cut Filter (IRCF) Film

302‧‧‧Infrared light absorbing material layer

400‧‧‧Anti-reflection film

500‧‧‧Second reflection interference type infrared cut filter (IRCF) film

600‧‧‧Composite infrared cut filter

Fig. 1 is a schematic cross-sectional view showing a composite filter element of the present invention.

Fig. 2 is a graph showing the wavelength-transmittance characteristics of the composite filter element of the present invention and conventional blue glass (BG).

Fig. 3 is a graph showing the wavelength-transmittance characteristics of the composite filter element of the present invention and a conventional infrared cut filter element (IRCF).

Fig. 4 is a graph showing the characteristics of the half transmittance (T50%) of the composite filter element of the present invention and the conventional infrared cut filter element (IRCF) at an incident angle of 0 degrees and 30 degrees, respectively.

Fig. 5 is a schematic cross-sectional view showing a second embodiment of the composite filter element of the present invention.

Fig. 6 is a schematic cross-sectional view showing a third embodiment of the composite type filter element of the present invention.

Fig. 7 is a view showing the wavelength-transmission characteristics of the second embodiment of the present invention at incident angles of 0, 15, 20, 25, 30 and 35 degrees, respectively.

Figure 8 is a view showing the composite infrared cut filter element and the conventional infrared cut filter element (IRCF) of the present invention at half angles of incidence angles of 0, 15, 20, 25, 30 and 35 degrees. The tolerance range value.

Figure 9 shows the field of the composite infrared cut filter element (B-6) and the conventional infrared cut filter element (IRCF), blue glass A (BG-A), and blue glass B (BG-B) of the present invention. Test chart.

The composite filter element of the present invention is as shown in Fig. 1, The composite filter element 100 includes a transparent substrate 200. The transparent substrate 200 is preferably made of a glass material having an upper surface 21 and a lower surface 22 opposite to the upper surface; a reflective dry/infrared light A reflection and/or absorption IR material 300 includes a reflective interference type infrared cut filter (IRCF) film 301, and an infrared light absorbing material layer 302 that reflects an interference type infrared cut filter (IRCF) film. The 301 and the infrared light absorbing material layer 302 are formed on the upper surface 21 and the lower surface 22 of the transparent substrate 200, respectively.

The infrared light absorbing material layer 302 of the reflection and/or absorption IR material 300 contains a cyclohexanone, an epoxy resin, and a metal-containing pigment ( The blue dye of the metal-containing pigment component is coated on the surface of the transparent substrate 200, so that the transparent substrate 200 can have the characteristics of blue glass, and has a higher transmittance for blue light, and the transmittance of infrared light is higher. Low and absorb infrared light.

Fig. 2 is a graph showing the wavelength-transmittance characteristics of the composite filter element of the present invention and conventional blue glass (BG). As shown in the figure, in the wavelength range of human visible light (400 nm to 700 nm), the composite filter element of the present invention and the conventional blue glass can all achieve a transmittance of 95% to 98%. That is, the composite filter element of the present invention has the same characteristics as conventional blue glass.

Composite filter element of the invention and conventional blue glass (BG) In contrast, traditional blue glass cannot be produced in large sizes, and production is limited. The composite filter element of the present invention can be mass-produced with a size of 8 inches of glass, and the thickness of the glass can be less than 0.3 millimeters (mm), 0.21 millimeters (mm), or even 0.145 millimeters (mm), but the conventional blue glass. Since the thickness of the glass is brittle, the thickness cannot be obtained by limiting the processing ability, and it is usually 0.3 mm or more. Moreover, it has been experimentally proved that the thickness of the transparent substrate 200 of the present invention can reach 0.145 mm (mm) to 0.3 mm (mm), and the thickness of the infrared light absorbing material layer 302 can be 2 micrometers (μm), and the reflection interference type infrared cut filter The thickness of the light (IRCF) film 301 may be 2.5 micrometers (μm). Therefore, the thickness of the entire composite filter element can be very thin, which is much smaller than the thickness of the conventional blue glass filter element.

Figure 3 is a graph showing the wavelength-transmittance characteristics of the composite filter element of the present invention and a conventional infrared cut filter element (IRCF), and Fig. 4 is a composite filter element of the present invention and a conventional infrared cut filter. A characteristic representation of the half-transmission ratio (T50%) of the element (IRCF) at an incident angle of 0 degrees and 30 degrees, respectively. As shown in the figure, the composite filter element of the present invention has an incident angle of 0 degrees and The 30-degree half-transmission rate (T50%) has a tolerance of 5 nm, and the conventional infrared cut-off filter element (IRCF) has a tolerance range of half-transmission (T50%) at an incident angle of 0 degrees and 30 degrees. Since it is 28 nm, the composite filter element of the present invention has high control precision.

Figure 5 is a second embodiment of the composite filter element of the present invention. As shown in the figure, the composite filter element of the present invention can also be implemented The upper surface of the infrared light absorbing material layer 302 is coated with an anti-reflection film 400 to reduce the reflection of incident light and improve the transmittance.

Alternatively, as shown in FIG. 6, a second reflective interference type infrared cut filter (IRCF) film 500 may be coated on the upper surface of the infrared absorbing material layer 302 to enhance the cutoff of the infrared light to form a composite type. Infrared cut filter element 600.

In the composite infrared cut filter element 600, the thickness of the transparent substrate 200A can be controlled to be 0.10 mm to 0.55 mm.

Fig. 7 is a graph showing the wavelength-transmission characteristics of the composite infrared cut filter elements of the present invention at incident angles of 0, 15, 20, 25, 30 and 35 degrees, respectively. Figure 8 is a view showing the composite infrared cut filter element and the conventional infrared cut filter element (IRCF) of the present invention at half angles of incidence angles of 0, 15, 20, 25, 30 and 35 degrees. As can be seen from the figure, the composite infrared cut filter element of the present invention has a low deviation value in various tolerance ranges of incident angles, that is, has high control precision.

Figure 9 shows the field of the composite infrared cut filter element (B-6) and the conventional infrared cut filter element (IRCF), blue glass A (BG-A), and blue glass B (BG-B) of the present invention. As shown in the figure, it is apparent from the figure that the composite infrared cut filter element (B-6) of the present invention can avoid glare or halation.

The composite filter element of the present invention has been experimentally confirmed to have the following characteristics:

1. Anti-reflective (absorbent material).

2. Reduce glare / ghosting.

3. Improve color images.

4. Enlarge the range of incident angles.

5. Reduce costs.

6. Can be mass produced.

7. High reliability, tested by 85 degrees Celsius (°C), humidity of 85%, and 1000 hours.

In summary, the composite filter element of the present invention can indeed improve the lack of the Xishui glass filter, which has not been used in public, and is in compliance with the provisions of the patent law, and is therefore required to grant a patent. .

The above is a preferred embodiment of the present invention. If the function of the present invention is changed, the functional function of the present invention should not be exceeded in the spirit of the specification and the drawings. Within the scope, it is combined with Chen Ming.

100‧‧‧Composite filter elements

200‧‧‧Transparent substrate

21‧‧‧ upper surface

22‧‧‧ Lower surface

300‧‧‧Reflection dry//infrared light absorbing material layer

301‧‧‧ Reflection Interferometric Infrared Cut Filter (IRCF) Film

302‧‧‧Infrared light absorbing material layer

Claims (5)

A composite filter element includes: a transparent substrate having an upper surface and a lower surface opposite to the upper surface; and a reflective dry//absorbing absorption IR material (Reflection and/or absorption IR material) a blue dye containing a cyclohexanone, an epoxy resin, a metal-containing pigment, which is formed on the surface of the transparent substrate to absorb and/or cut off the infrared Light, and can enhance the visible light transmittance of the substrate. The composite filter element of claim 1, wherein the reflection and/or absorption IR material comprises a reflective interference type infrared cut filter (IRCF) film, And an infrared light absorbing material layer, the reflective interference type infrared cut filter (IRCF) film and the infrared light absorbing material layer are respectively formed on the upper surface and/or the lower surface of the transparent substrate. The composite filter element according to claim 1 or 2, wherein the transparent substrate has a thickness of 0.1 mm (mm) to 0.3 mm (mm); and the infrared light absorbing material layer has a thickness of not more than 4 μm. (μm); The thickness of the reflective interference type infrared cut filter (IRCF) film is not more than 4 micrometers (μm). The composite filter element according to claim 3, wherein the transparent substrate covering the reflection and/or absorption IR material is coated with a wavelength of 400 nm (nm). The visible light transmittance of -700 nm (nm) is 95%-98%, and the deviation range of the half penetration position (T50%) of the incident angle of 0 degree or 30 degrees does not exceed 10 nanometers (nm). The composite filter element of claim 4, wherein the upper surface of the infrared light absorbing material layer of the reflection and/or absorption IR material is reflected and dried An anti-reflection film or a second reflection interference type infrared cut filter (IRCF) film.