TWI547886B - Fingerprint identification board light guide structure - Google Patents

Description

Fingerprint identification board light guiding structure

The invention relates to a light guiding structure of a fingerprint identification board, in particular to a fingerprint identification board light guiding structure which is applied to an electronic device and can be placed by a finger and provides brightness required for acquiring a fingerprint.

Electronic devices, such as smart phones, laptops, flash drives, and more like smart door locks, often need to store important information such as personal letters or photos, or to unlock, burglar, and so on.

Most of the early electronic devices used password settings to prevent malicious or deliberate stealing of important data or to prevent thieves from invading. However, in order to avoid password forgetting, the general user often uses the important number such as the birthday of himself or his family to set the password when using the password setting. In this way, it is easy for the person concerned to use various methods to obtain the password, which is important. The leakage of information.

Therefore, in order to improve the functionality of theft prevention, today's electronic devices have gradually adopted the effect of fingerprint recognition. The advantage of fingerprint recognition is that others can't copy it, which can greatly improve the effect of confidentiality. As shown in Figure 1, today's smart phone A has become a necessity for life. Most users will use the smart phone A to send and receive mail or store personal data.

Therefore, most of the existing smart phone As are imported with fingerprint recognition. Can, and then emphasize the effect of theft. For example, the smart phone A is provided with a fingerprint identification area B, so that the user can read the fingerprint to achieve the unlocking effect, and then log in to the smart phone A.

The existing fingerprint identifier is mainly provided with an image capturing device on the circuit board, and a light guiding plate is disposed above the image capturing device, and a light emitting diode is disposed on a side of the light guiding plate to utilize the light emitting diode The released light is introduced into the light guide plate, so that when the user places the finger on the fingerprint recognition area, the light guide plate can be used to increase the brightness of the finger, so that the image capturing device can read the fingerprint on the finger, and then Perform a fingerprint comparison.

However, in the existing fingerprint recognizer, most of the light-emitting diodes and the image capturing device are simultaneously disposed on the circuit board, which causes the process of the process to be cumbersome and increases the manufacturing cost.

Another existing fingerprint identifier integrates the image capturing device, the light guide plate and the light-emitting diode together, and then fixes it on the circuit board. However, the overall structure design and volume of this type of fingerprint reader are quite large. Therefore, when it is mounted on a smart phone, the smart phone is too large to meet the slim and portable effect.

In this way, how to provide a fingerprint identification plate light guiding structure and a manufacturing method thereof for use in an electronic device, which can be placed by a finger and provide brightness required for fingerprint collection, and which can satisfy the volume and thickness, is The technical means to be solved and its main purpose.

In view of the above problems, the present invention relates to a light guide structure of a fingerprint identification board and a manufacturing method thereof, and particularly to a light guide structure of a fingerprint identification board which is applied to an electronic device and can be placed by a finger and provides brightness required for fingerprint collection and Its manufacturing method.

In order to achieve the above object, the light guide structure of the fingerprint identification board of the present invention and the manufacturing method thereof comprise a frame body having a hollow portion, a plurality of light emitting diodes and a light guide plate. Wherein, the frame system is formed by injection molding a mixed material of a mixed material of a plastic material and a metal material, and then the texture is engraved on the frame by Laser Direct Structuring, and then the grain of the frame is electroplated or electrolessly plated. Forming a plurality of conductive portions thereon to form a frame having a conductive line; and then bonding the plurality of light-emitting diodes to the conductive portion of the frame by the SMT process to cause the light emitted by the light-emitting diodes Can be projected into the light guide plate.

Therefore, the frame body is formed by the laser engraving process and the electroplating method, so that the frame body can be minimized, and when it is applied to an electronic device, the requirements for thinning and thinning of the electronic device can be met.

A‧‧‧Smart Phone

B‧‧‧ fingerprint identification area

C‧‧‧Board

D‧‧‧Image capture device

E‧‧‧protection board

10‧‧‧ Fingerprinting plate light guiding structure

20‧‧‧ frame

21‧‧‧ Hollow

22‧‧‧ upper surface

23‧‧‧ Lower surface

24‧‧‧ accommodating slots

25‧‧‧ positioning slot

26‧‧‧ first through hole

27‧‧‧Second through hole

28‧‧‧stop block

29‧‧‧Positioning column

30‧‧‧Light guide

40‧‧‧First electrode

50‧‧‧second electrode

60‧‧‧Lighting diode

61‧‧‧ lateral illumination area

62‧‧‧Positioning bumps

63‧‧‧First electrode foot

64‧‧‧second electrode foot

70‧‧‧IR Receiver

71‧‧‧IR emitter

72‧‧‧IR receiver

73‧‧‧Positioning bumps

74‧‧‧First electrode foot

75‧‧‧second electrode foot

Figure 1 is a perspective view of a conventional smart phone.

Fig. 2 is a cross-sectional view showing the state of use of the light guiding structure of the present invention.

Figure 3 is an exploded perspective view of the light guiding structure of the present invention.

Figure 4 is a perspective view of the light guiding structure of the present invention.

Figure 5 is a plan view of the frame of the present invention.

Figure 6 is a schematic view of the back of the light guiding structure of the present invention.

Figure 7 is a front elevational view of the light guiding structure of the present invention.

Figure 8 is a schematic cross-sectional view taken along line A-A of Figure 7.

Figure 9 is a cross-sectional view taken along line B-B of Figure 7.

As shown in FIG. 2, the present invention relates to a light guide junction for a fingerprint identification board. The fingerprint recognition board light guiding structure 10 is configured to be disposed on a circuit board C and used to cover an image capturing device D.

In this embodiment, the fingerprint light guide structure 10 is disposed on the smart phone. The fingerprint light guide structure 10 is disposed on the circuit board C and covers the image capture device D. The fingerprint recognition light guide structure 10 is provided. The cover plate is further covered with a protective plate E, so that the light guide structure 10 of the fingerprint identification plate is fixed between the circuit board C and the protection board E. In this embodiment, the protection board E can be made of glass, plastic or any see-through material. production.

As shown in FIG. 3 and FIG. 4, the light guiding structure includes a frame 20, a light guide plate 30, a plurality of first electrodes 40, a plurality of second electrodes 50, a plurality of light emitting diodes 60, and a pair. The IR receivers 70.

As shown in FIG. 5 and FIG. 6, the frame 20 is surrounded by a plurality of side strips, and a hollow portion 21 is formed in the center of the frame 20, and the frame 20 has an upper surface 22 and an upper portion. The surface 22 corresponds to the lower surface 23; each of the side strips is formed with a plurality of accommodating grooves 24 extending from the upper surface 22 toward the lower surface 23, and a positioning groove 25 is formed and penetrates the upper surface 22 respectively. And a first through hole 26 and a second through hole 27 of the lower surface 23, a stop block 28 is formed between the first through hole 26 and the second through hole 27, and the lower surface 23 of the frame body 20 extends downwardly at least one Positioning post 29.

As shown in FIG. 3, the light guide plate 30 is disposed on the upper surface 22 of the frame 20 and covers the hollow portion 21 of the frame 20.

As shown in FIG. 3 , FIG. 5 , and FIG. 6 , the first electrodes 40 are formed in the first through holes 26 . In the embodiment, the first electrodes 40 extend to the frame 20 . The upper surface 22 is electrically connected to each other, and the at least one first electrode 40 extends to the lower surface 23 of the frame 20.

The second electrodes 50 are formed in the second through holes 27, and in the embodiment, the second electrodes 50 extend to the upper surface 22 of the frame 20, electrically connected to each other, and at least a second electrode 50 extends to the lower surface 23 of the frame 20. The first electrode 40 and the second electrode 50 are not electrically connected to each other on the frame 20 .

It should be noted that the frame 20, the first electrode 40 and the second electrode 50 in this embodiment are formed by injection molding combined with Laser Direct Structuring. The so-called injection molding combined with the Laser Direct Structuring process uses a mixture of plastic and metal materials through injection molding, and then through the laser engraving, electroplating and other process technology, the first electrode 40 and the second electrode 50 are directly It is formed on the frame body 20, whereby the thickness of the frame body 20 can be reduced, and the frame body 20 can be made thinner. Of course, the frame body 20, the first electrode 40, and the second electrode 50 can also be formed by a metal injection molding process. This embodiment will be described only with an optimized effect.

Each of the light-emitting diodes 60 is disposed in each of the accommodating grooves 24 and is disposed around the light guide plate 30 . Each of the light-emitting diodes 60 has a lateral light-emitting area 61, and each of the lateral light-emitting areas 61 is located at a side of the light-guiding plate 30, and a positioning bump 62 is formed below each of the light-emitting diodes 60. An electrode leg 63 and a second electrode leg 64 are located between the first electrode leg 63 and the second electrode leg 64, and the length of the first electrode leg 63 and the second electrode leg 64 is greater than the positioning bump 62. length.

As shown in FIG. 5 , FIG. 7 , FIG. 8 , and FIG. 9 , the positioning protrusion 62 of each of the light-emitting diodes 60 is embedded in the positioning groove 25 of the receiving groove 24 and is disposed on the positioning groove 25 . Above the stop block 28; the first electrode leg 40 is exposed to the lower surface 23 of the frame 20 through the first through hole 26, and is electrically connected to the first electrode 40; the second electrode 50 passes through the second The through hole 27 is also exposed to the frame 20 The lower surface 23 is electrically connected to the second electrode 50.

A pair of IR receivers 70 includes an IR emitter 71 and an IR receiver 72. The IR receivers 70 are disposed on two corresponding side strips of the housing 20. In this embodiment, the frame 20 is formed by two short side strips and two long side strips, and the two short side strips and the two long side strips are correspondingly arranged, and the pair of IR receivers are arranged. 70 is disposed on the two long side strips, that is, the IR emitter 71 is disposed in the receiving slot 24 of one of the long side strips, and the IR receiver 72 is disposed on the other long side strip. In the slot 24, the IR emitter 71 and the IR receiver 72 are disposed corresponding to each other, and the IR emitter 71 and the IR receiver 72 have the same positioning bump 73 and the first electrode leg 74 as each of the LEDs. The second electrode leg 75 is electrically connected to the first electrode 40 and the second electrode 50 in the first through hole 26 and the second through hole 27, and exposes the first electrode leg 74 and the second electrode leg 75. On the lower surface 23 of the frame 2.

Therefore, when the fingerprint light guide structure 10 of the present embodiment is mounted on the circuit board C, the light transmission structure 10 of the present embodiment is mainly extended to the lower surface of the frame 20, as shown in FIG. 2, FIG. 3, and FIG. The first electrode 40 and the second electrode 5 of the 23 are electrically connected to the circuit board C, and can also pass through the light emitting diodes 60 and the first electrode legs 63, 74 and the second of the pair of IR receivers 40. The electrode legs 64 and 75 are electrically connected to the circuit board C, and then the circuit board C is turned on to drive the LEDs 60 and the pair of IR receivers 70.

When the user's finger is placed on the light guide plate 30, the pair of IR receivers 70 receive the signal of the finger placement, and the light-emitting diodes 60 are driven to release the light-emitting diodes 60. The light is projected through the lateral light-emitting area 61 of each of the light-emitting diodes 60, and the light enters the light guide plate 30 from the side of the light guide plate 30 to illuminate the light guide plate 30, thereby making the circuit board The image capturing device D on C can clearly read the fingerprint on the finger.

In this embodiment, the accommodating groove 24 is formed in the frame body 20, and the light-emitting diodes 60 and the pair of IR receivers 70 are received in the accommodating groove 24, and then transmitted through the illuminating diode. The body 60 and the positioning projections 6273 on the IR receiver 70 are embedded in the positioning grooves 24 of the housing 20, so that the LEDs and the IR receiver 70 can be effectively fixed to the housing 20.

In addition, the height of the frame 20 can be effectively reduced, and the frame can be made through the LDS process, and the thinning of the light guiding structure of the fingerprint identification plate can be effectively improved when applied to an electronic device. The thickness can reach the thinning requirements of the electronic device, and the time for assembling the electronic device can be reduced, the manufacturing man-hour can be shortened, the assembly efficiency can be improved, and the cost can be reduced.

20‧‧‧ frame

30‧‧‧Light guide

40‧‧‧First electrode

50‧‧‧second electrode

60‧‧‧Lighting diode

70‧‧‧IR Receiver

Claims (10)

A light guide structure of a fingerprint identification board comprises: a frame surrounded by a plurality of side strips and formed with a hollow portion, wherein the frame body has an upper surface and a lower surface, and the plurality of side strips are formed with a plurality of housings a groove, each of the accommodating grooves is formed with a first through hole and a second through hole penetrating the upper surface and the lower surface; a light guide plate covering the hollow portion of the frame body; the plurality of first electrodes, Forming in the first through hole of the frame; a plurality of second electrodes are formed in the second through hole of the frame; and a plurality of light emitting diodes, wherein each of the light emitting diodes is respectively disposed on the frame Each of the accommodating slots is disposed around the light guide plate, each of the light emitting diodes has a first electrode leg and a second electrode leg, and the first electrode leg passes through the first through hole The first electrode is electrically connected, and the second electrode is electrically connected to the second electrode through the second through hole, so that the first electrode and the second electrode are exposed to the lower surface of the frame. The fingerprint identification plate light guiding structure of claim 1, wherein the first electrodes are electrically connected to each other on an upper surface of the frame. The fingerprint recognition plate light guiding structure of claim 2, wherein at least one of the first electrodes extends to a lower surface of the frame. The fingerprint identification plate light guiding structure of claim 1, wherein the second electrodes are electrically connected to each other on an upper surface of the frame. The fingerprint recognition plate light guiding structure of claim 4, wherein at least one of the second electrodes extends to a lower surface of the frame. The light-receiving structure of the fingerprint identification board of claim 1, further comprising a pair of IR receivers embedded in the corresponding receiving slots and respectively in the receiving slot and the first electrode And the second electrodes are electrically connected to each other. The light-receiving structure of the fingerprint-recognition board of claim 1, wherein each of the light-emitting diodes is convexly disposed with a positioning protrusion, and each of the receiving slots of the frame is received by each of the housings The slot extends downwardly to form a positioning slot corresponding to each of the positioning protrusions, so that each positioning protrusion is embedded in each positioning slot. The fingerprint identification plate light guiding structure of claim 7, wherein each positioning protrusion is located between the first electrode leg and the second electrode leg of each of the light emitting diodes. The light guide structure of the fingerprint identification board of claim 6, wherein a stopper is formed between the first through hole and the second through hole of the frame. The light guide structure of the fingerprint identification board of claim 1, wherein at least one positioning post extends downward from a lower surface of the frame.