CN105404879A - Fingerprint acquisition apparatus, imaging device of fingerprint acquisition apparatus, manufacturing method for imaging device and electronic device - Google Patents

Abstract

The present invention discloses a fingerprint acquisition apparatus, an imaging device of the fingerprint acquisition apparatus, a manufacturing method for the imaging device and an electronic device. The imaging device of the fingerprint acquisition apparatus comprises an acquisition surface and an imaging surface which are opposite. The acquisition surface has an acquisition region; the imaging surface has an imaging region corresponding to the acquisition region; the imaging device is provided with a plurality of small holes that connect the acquisition region with the imaging region; and the small holes are optically insulated. The imaging device provided by an embodiment of the invention is high in resolution and small in volume.

Description

Fingerprint collection device, its imaging device, preparation method, and electronic equipment

technical field

The invention relates to the technical field of fingerprint collection, in particular to a fingerprint collection device, an imaging device, a preparation method thereof, and electronic equipment.

Background technique

With the development of high technology, the miniaturization of imaging system has become one of the research contents of information identification and verification system. For example, fingerprint collection devices, image recognition devices, etc. are gradually applied in electronic devices such as mobile phones and desktop computers. The imaging device of the existing imaging system adopts a prism, and since the collection plane and the imaging plane are not in two parallel planes during imaging by the prism, the volume of the existing imaging system is relatively large. Therefore, the existing imaging system does not meet the development trend of thinner and thinner electronic devices such as mobile phones and tablet computers. In addition, because the existing imaging system uses a prism as an imaging device for imaging, its resolution is poor, and it can no longer adapt to the development trend of high-resolution imaging.

Contents of the invention

In view of this, an embodiment of the present invention provides an imaging device of a fingerprint collection device, the main purpose of which is to improve the imaging resolution and reduce the volume of the imaging system.

In order to achieve the above object, the present invention mainly provides the following technical solutions:

On the one hand, an embodiment of the present invention provides an imaging device of a fingerprint collection device, including an opposite collection surface and an imaging surface, the collection surface has a collection area, and the imaging surface has an imaging area corresponding to the collection area. The imaging device has a plurality of small holes passing through the collection area and the imaging area, and the small holes are optically insulated.

Preferably, the collection area and the imaging area are located in the middle of the imaging device, and the outside of the collection area and the imaging area form an installation area.

Preferably, the cross section of the imaging device is circular or regular hexagonal.

On the other hand, an embodiment of the present invention provides a method for manufacturing the imaging device of the fingerprint collection device described in the above embodiments, including the following steps:

Set the glass tube of acid-resistant glass material on the glass rod of acid-soluble glass material with matching size to obtain the glass rod tube;

drawing the glass rod tube to obtain the first glass filament;

arranging and bundling the drawn first glass strands to obtain a first composite glass rod;

drawing the first composite glass rod to obtain the first composite glass filament;

arranging and bundling the first composite glass strands to obtain a second composite glass rod;

drawing the second composite glass rod to obtain a second composite glass filament;

Cutting the second composite glass filament to a fixed length according to the thickness required by the imaging device, and performing typesetting on the cut second composite glass filament according to the required shape and size of the imaging device to obtain a hot-press mold blank;

placing the hot-press mold blank in a hot-press furnace for melting and pressing to obtain an imaging device blank;

Carry out shaping treatment on the blank to obtain semi-finished glass pieces of the size required by the finished product;

Perform microporous forming treatment on semi-finished glass parts to remove acid-soluble glass material to obtain microporous glass parts;

The above-mentioned microporous glass piece is subjected to reduction treatment to form a light absorbing layer on the inner wall of the microporous channel to realize insulation between the micropores and prevent light crossing, thereby obtaining an imaging device.

Preferably, the cross section of the first composite glass rod is a regular hexagon.

Preferably, when the first glass filaments are arranged on the first composite glass rod, the gaps between the first glass filaments are filled with third glass filaments, and the third glass filaments are drawn once by the glass rod tube or rearranged after drawing once. obtained by secondary drawing.

Preferably, the glass tube is made of glass whose main component is B ₂ O ₃ -SiO2-Al ₂ O ₃ -RO-R ₂ O, where R0 is a divalent oxide, and R ₂ O is a monovalent oxide; the glass The rod is made of glass whose main component is B ₂ O ₃ -La ₂ O ₃ -BaO.

Preferably, the core-skin ratio of the glass rod tube (the ratio of the diameter of the glass rod to the wall thickness of the glass tube) is 5-12:1. 10:1 is preferred.

Preferably, when the micropores of the semi-finished glass are formed, the semi-finished glass is soaked in flowing acid until all the glass filaments drawn from the glass rod are dissolved, and then ultrasonically cleaned in pure water to obtain micropores. Glass pieces.

Preferably, the sizing treatment of the blank includes rounding, cutting, flat grinding and flat polishing, so that the obtained semi-finished glass piece reaches the required size of the finished product.

Preferably, the microporous glass piece is subjected to reduction treatment in a hydrogen reduction furnace, the hydrogen pressure is 0.01-0.3 MPa, the temperature is 400-480° C., and the treatment time is 1-5 hours.

Preferably, when the second composite glass filament is typesetting, glass sheets or glass filaments of the same material as the glass tube are arranged outside the main body composed of the second composite glass filament, so as to form an installation area.

On the other hand, an embodiment of the present invention provides a fingerprint collection device, including an imaging device, and the imaging device is the imaging device described in the above embodiments.

On the other hand, an embodiment of the present invention provides an electronic device, including a fingerprint collection device, where the fingerprint collection device is the fingerprint collection device described in the above embodiments.

Preferably, the electronic equipment includes a mobile phone and a tablet computer.

Compared with prior art, the beneficial effect of the present invention is:

The imaging device of the fingerprint collection device in the embodiment of the present invention has the characteristics of ultra-thin, miniaturized, and ultra-high resolution, and provides key components for the information identification and verification system. When the fingerprint collection device of the present invention is used in electronic equipment, it occupies a small volume, which conforms to the development trend of ultra-thin electronic equipment.

Description of drawings

Fig. 1 is the schematic cross-sectional view of the first composite glass rod obtained in Example 1 of the present invention;

Fig. 2 is a schematic cross-sectional view of the second composite glass rod obtained in Example 1 of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with specific examples, but not as a limitation of the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

Example 1

The glass tube made of acid-resistant glass material is selected. The main component of the glass used in the general glass tube is B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ -RO-R ₂ O, and R0 is a divalent oxide, such as MgO , BaO, etc., R ₂ O is a monovalent oxide, such as K ₂ 0, Na ₂ O, etc.; use glass rods made of acid-soluble glass materials, and the main component of glass used for glass rods is B ₂ O ₃ -La ₂ O ₃ -BaO.

The specification of the glass tube used is 30±0.2mm in inner diameter, 39±0.3mm in outer diameter, and the specification of the glass rod used is 29.8±0.2mm, and the glass tube is sheathed outside the glass rod to form a glass rod tube. The core-skin ratio of the glass rod tube is selected as 10:1.

After the glass tube and the glass rod are matched, the glass rod tube is drawn, cleaned and dried, and then installed on a high-precision fiber drawing machine to make the first glass filament. The drawing speed is 4.5mm/min; where the diameter of the first glass filament 2.8mm;

Arrange a plurality of first glass filaments tightly in a regular hexagonal mold. The number of arrangement is determined by the diameter of the first glass filaments and the size of the mold. After the arrangement is completed, tightly bind the two ends with copper wire or iron wire, and wrap the middle part with a raw material tape. Bundle at a certain interval to obtain the first composite glass rod, the cross section of the first composite glass rod is a regular hexagon; the length of the opposite side of the first composite glass rod is 25mm;

The first composite glass rod is clamped and hung on a wire drawing machine for drawing. The drawing method is the same as that for drawing the first glass filament, and the first composite glass rod is drawn into a first composite glass filament with a regular hexagonal cross section;

Arrange the first composite glass filaments tightly in the regular hexagonal mold. After the arrangement is completed, tightly bind the two ends with copper wire or iron wire, and bind the middle part with a raw material tape at a certain distance to obtain the first composite glass with a regular hexagonal cross section. Two composite glass rods, the length of the opposite side of the second composite glass rod is 25mm;

Hanging the second composite glass rod on a wire drawing machine for secondary multifilament drawing after being clamped, the drawing method is the same as that of the monofilament, and the second composite glass filament with a regular hexagonal cross section is obtained;

The second composite glass filament is cut to a fixed length according to the height of the hot-pressing mold, and the second composite glass filament of fixed length obtained after cutting is arranged to obtain a hot-pressing mold blank, and the hot-pressing mold blank is loaded into the hot-pressing mold, placed Heat up and pressurize in a hot-press furnace for melt-press molding to obtain imaging device blanks;

Carry out sizing treatment on the blank: After removing the two ends of the plate segment formed by melting and pressing, it is placed on a rounding machine for rounding. The size of the rounding is based on the size of the finished product and the subsequent processing allowance is considered. For thick cutting, the cutting thickness is 0.3mm; then finish the fine polishing of both ends on the double-sided polishing machine, the thickness tolerance is controlled at ±0.01mm, and the semi-finished glass parts that meet the size required by the finished product are obtained;

Put the semi-finished glass parts in an acid-resistant container for micropore forming, and use nitric acid with a molar concentration of 0.5mol/L to acid-etch the semi-finished glass parts. The acid-etching temperature is 60°C, and the acid solution is kept in a flowing state during the acid-etching process. , until all the silk drawn by the first glass rod dissolves, the acid etching time is 2-5 hours; after the acid etching is finished, the second glass part after the acid etching process is ultrasonically cleaned with pure water, and the obtained microporous glass;

Put the microporous glass piece into the hydrogen reduction furnace for reduction treatment, so as to form a light absorbing layer from the substrate on the inner wall of the microporous channel, realize the insulation between the micropores, and prevent cross-lighting. The hydrogen pressure during the reduction treatment is 0.01-0.3 MPa, the reduction treatment temperature is 400-480° C., and the reduction treatment time is 1-5 hours. After the reduction treatment is completed, an imaging device is obtained.

Example 2

The difference between this embodiment and embodiment 1 is that when the first glass filaments are arranged, the third glass filaments are inserted into the gaps between the closely arranged first glass filaments, and the third glass filaments fill the gaps between the first glass filaments. The third glass filament can be drawn from a glass rod tube at one time, referring to the drawing of the first glass filament, but the diameter is smaller than that of the first glass filament, so as to be able to fill the gap between the first glass filaments. Since the requirement for the third glass filament is relatively low, the quality of the finished imaging device will not be affected even if a glass filament with a smaller diameter is obtained through one drawing. Of course, in order to improve the quality of the third glass filament, the third glass filament can be obtained by secondary drawing from the glass rod tube in the same way as the first composite glass filament or the second composite glass filament, so as to avoid the wall breakage caused by the first drawing of the third glass filament. By filling the third glass filaments, not only the connection strength of the first composite glass filaments can be improved, but also the resolution of the finished imaging device can be further improved.

Example 3

The difference between this embodiment and Embodiment 1 or Embodiment 2 is that when the second composite glass filaments are arranged, the second composite glass filaments are arranged to form a main body, and glass sheets or glass filaments made of glass tubes are arranged outside the main body, or arranged with glass Sheets or strands of glass made of glass with similar coefficients of expansion to form the installation area. Since the installation area is a non-imaging area, the requirement is relatively low, and the material cost and production cost are both low, which can reduce the overall cost of the imaging device. The acquisition area of the imaging device in this embodiment is the main part on the side of the acquisition surface, the imaging area is the main part on the imaging side, and the installation area does not have micropores, so the preparation is simple. The installation area of the imaging device obtained in Example 1 and Example 2 is the same as the main part of the acquisition area and the imaging area, so the cost is higher than that of Example 3.

The performance indexes of the imaging devices obtained in Example 1 and Example 2 are shown in Table 1.

Table 1

It can be seen that the preparation method of the microporous imaging device provided by the present invention can produce a high-resolution, ultra-thin, and miniaturized optical imaging device, and the focal length can be adjusted arbitrarily according to the system design requirements, breaking through the input of glass materials and optical fiber panel materials. The limitation of distance has become the key material of the information identification and verification system. In addition, this molding material is not limited by the target wavelength, and can be imaged from deep ultraviolet to mid-to-far infrared.

Therefore, the volume of the fingerprint collection device adopting the imaging device of the embodiment of the present invention is reduced, and the resolution is greatly improved.

The thickness of the electronic equipment adopting the fingerprint collection device of the embodiment of the present invention can be further reduced. It can be seen that the fingerprint collection device of the embodiment of the present invention conforms to the current development trend of ultra-thin electronic equipment. The aforementioned electronic devices include mobile phones, tablet computers, and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (15)

1. the image device of fingerprint acquisition device, it is characterized in that, comprise relative collection face and imaging surface, described collection mask has acquisition zone, described imaging surface has the imaging area corresponding with acquisition zone, described image device has the aperture of multiple through acquisition zone and imaging area, light insulation between described aperture.

2. the image device of fingerprint acquisition device according to claim 1, is characterized in that, described acquisition zone and imaging area are positioned at the middle part of described image device, and the outside of described acquisition zone and imaging area forms installing zone.

3. the image device of fingerprint acquisition device according to claim 1, is characterized in that, the xsect of described image device is circular or regular hexagon.

4. the preparation method of the image device of fingerprint acquisition device according to claim 1, comprises the steps:

The glass tube of acid proof glass material is sleeved on the glass bar that can be dissolved in the glass material of acid of size coupling, obtains glass bar pipe;

Wire drawing is carried out to glass bar pipe, obtains the first glass fiber;

By drawing shaping first glass fiber arrangement, tie up and obtain the first compound glass rod;

Wire drawing is carried out to the first compound glass rod, obtains the first compound glass silk;

By first compound glass silk arrangement, tie up obtain second compound glass rod;

Wire drawing is carried out to the second compound glass rod, obtains the second compound glass silk;

According to image device desired thickness, fixed length cutting is carried out to the second compound glass silk, and carry out typesetting according to the second compound glass silk after image device required form and large young pathbreaker's cutting, obtain hot-die base;

Hot-die base is placed in fusion pressure in hot pressing furnace shaping, obtains image device blank;

Heat treatment is carried out to blank, obtains the Semi-finished glass part of the size required by finished product;

Micro molding process is carried out to Semi-finished glass part, removes the glass material that can be dissolved in acid, obtain micropore glass part;

Above-mentioned micropore glass part is carried out reduction treatment, generates light absorbing zone at micro channel inwall, realize insulating between micropore, prevent optical crosstalk, obtain image device.

5. preparation method according to claim 4, is characterized in that, the xsect of described first compound glass rod is regular hexagon.

6. preparation method according to claim 4, it is characterized in that, when described first glass fiber arranges the first compound glass rod, be filled with the 3rd glass fiber in gap between first glass fiber, described 3rd glass fiber rearranges secondary drawing after once being drawn by glass bar pipe or once drawing and obtains.

7. preparation method according to claim 4, is characterized in that, described glass tube selects major component to be B ₂o ₃-SiO2-Al ₂o ₃-RO-R ₂the glass of O, R0 is oxides, divalent, R ₂o is univalent oxide; Described glass bar selects major component to be B ₂o ₃-La ₂o ₃the glass of-BaO.

8. preparation method according to claim 4, is characterized in that, the diameter of described glass bar is 5-12:1 with the ratio of the wall thickness of glass tube.

9. preparation method according to claim 4, it is characterized in that, during described Semi-finished glass part micro molding process, Semi-finished glass part is soaked in the acid solution of flowing, until the glass fiber that glass bar is drawn into all dissolves away, then ultrasonic cleaning in pure water, obtains micropore glass part.

10. preparation method according to claim 4, is characterized in that, to blank carry out heat treatment comprise round as a ball, cutting, plain grinding peace throw operation, the Semi-finished glass part obtained reaches the size required by finished product.

11. preparation methods according to claim 4, is characterized in that, described micropore glass part carries out reduction treatment in hydrogen reducing furnace, and Hydrogen Vapor Pressure is 0.01-0.3MPa, and temperature is 400-480 DEG C, and the time of process is 1-5 hour.

12. preparation methods according to claim 4, is characterized in that, when carrying out typesetting to the second compound glass silk, at the identical glass sheet of material or the glass fiber of the outside arrangement glass tube of the main body of the second compound glass silk composition, to form installing zone.

13. fingerprint acquisition devices, comprise image device, it is characterized in that, described image device is image device according to claim 1.

14. electronic equipments, comprise fingerprint acquisition device, it is characterized in that, described fingerprint acquisition device is fingerprint acquisition device according to claim 13.

15. electronic equipments according to claim 14, is characterized in that, described electronic equipment comprises mobile phone and panel computer.