CN212723675U

CN212723675U - Optical device and wearable equipment

Info

Publication number: CN212723675U
Application number: CN202021748887.XU
Authority: CN
Inventors: 汪奎; 王德信
Original assignee: Qingdao Goertek Intelligent Sensor Co Ltd
Current assignee: Qingdao Goertek Intelligent Sensor Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-03-16
Anticipated expiration: 2030-08-19

Abstract

The utility model discloses an optical device and wearable equipment, optical device includes: the shell is internally provided with a cavity, and the shell is provided with a window communicated with the cavity; the optical module is accommodated in the cavity and comprises a substrate, a component and a cover plate, the cover plate is arranged on the substrate in a covering mode, an accommodating space is formed between the cover plate and the substrate, and the component is accommodated in the accommodating space; one side of the cover plate, which is far away from the base plate, protrudes towards the window and is embedded in the window so as to seal the window, and a light-transmitting area is arranged at the position of the cover plate, which corresponds to the window. The utility model discloses the shared space of optical module in wearable equipment has been dwindled greatly, is favorable to realizing the miniaturization of equipment. And, optical module send and receive light only need pass the printing opacity district of apron can, and need not additionally pass the transparent medium of shell, the light efficiency loss is little, and optical module's luminous efficiency is higher, and optical module can obtain stronger light signal with littleer components and parts drive current, has reduced the consumption.

Description

Optical device and wearable equipment

Technical Field

The utility model relates to an electronic equipment technical field, in particular to optical device and wearable equipment.

Background

With the increasing health awareness of people, more and more intelligent electronic devices, such as a bracelet and a watch, are selected on an integrated optical device, such as a heart rate sensor, and the heart rate sensor measures the heart rate and the blood oxygen concentration of a user according to the PPG principle. In the industry, optical modules are generally encapsulated by pouring sealant or attaching a glass cover plate, and when the optical modules are applied to a whole machine, windowing design is often required to be performed on a shell of the equipment. However, the following problems exist in the way of pouring the sealant or attaching the glass cover plate: (1) the upper surface of the optical module is generally a plane, which cannot be well adapted to the situation when the casing of the equipment is a curved surface, and waste of the internal space of the equipment can be caused; (2) a layer of transparent medium is required to be arranged at the window of the shell, the heart rate module is also provided with a layer of transparent medium, so that light signals sent or received by the equipment need to pass through the two layers of transparent media, and the light effect loss is large due to the phenomena of medium absorption and interface reflection; (3) because the distance between the optical module and the shell window cannot be completely eliminated during assembly, part of light emitted by the LED can be reflected to the PD by the lower surface of the window to form optical crosstalk, and the accuracy of a measuring signal is influenced; (4) the module needs to be pasted on FPC or PCB and is positioned by means of PCB or FPC, and errors in pasting and positioning errors of FPC or PCB can influence the position relation between the module and the window of the shell and the actual FOV angle of the optical module.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an optical device and wearable equipment aims at solving the extravagant equipment space of current optical device and the big technical problem of light efficiency loss.

To achieve the above object, the present invention provides an optical device comprising:

the shell is internally provided with a cavity, and the shell is provided with a window communicated with the cavity;

the optical module is accommodated in the cavity and comprises a substrate, a component and a cover plate, the cover plate is arranged on the substrate in a covering mode, an accommodating space is formed between the cover plate and the substrate, and the component is accommodated in the accommodating space;

one side of the cover plate, which is far away from the base plate, protrudes towards the window and is embedded at the window so as to seal the window, and a light-transmitting area is arranged at the position of the cover plate, which corresponds to the window.

Preferably, the cover plate includes a light shielding plate and a light transmitting block, one end of the light shielding plate is mounted on the substrate, the other end of the light shielding plate protrudes toward the window and is embedded at the window, the light shielding plate is enclosed into the accommodating space, an opening is formed in one side of the accommodating space, which faces the window, the light transmitting block is mounted at the opening and seals the opening, and the light transmitting block forms the light transmitting area.

Preferably, the light shading plate and the light transmitting block are integrally formed by adopting a double-shot injection molding, secondary injection molding or encapsulation process.

Preferably, the optical module has a plurality of receiving spaces arranged at intervals, any two adjacent receiving spaces are separated by the light shielding plate, and each receiving space is correspondingly provided with one light-transmitting block; the component comprises a light-emitting element and a light-receiving element, and the light-emitting element and the light-receiving element are respectively arranged in different accommodating spaces.

Preferably, the light shielding plate is bonded to the substrate through an adhesive, a vent hole is formed in the position of the substrate corresponding to the accommodating space, the vent hole is used for communicating the accommodating space with the cavity, and the vent hole is filled with an adhesive which seals the through hole.

Preferably, the side wall of the window forms an inclined surface, the inclined surface is arranged in a tapered manner in a direction away from the cavity, and the outer wall of the cover plate forms a slope surface which is matched with the inclined surface and is abutted to the inclined surface.

Preferably, the cover plate is provided with a step, the edge of the shell where the window is located is arranged on the step, and a sealing ring for sealing the step and the shell is arranged at the corner of the step.

Preferably, the optical module further comprises a connector mounted on a side of the substrate facing away from the accommodating space;

and the number of the first and second electrodes,

the shell and the optical module are positioned and installed through the hot melting column.

Preferably, the outer surface of the shell and the surface of the cover plate, which is away from the cavity, are smoothly and transitionally connected into an integral surface, and the integral surface is provided with a scratch-proof layer.

The utility model discloses still provide a wearable equipment, wearable equipment includes as above the optical device.

The utility model discloses among the optical device, optical module's apron protrusion is inlayed and is located window department with the window shutoff, the apron can directly be as wearable equipment's optics windowing, the window position department of shell need not additionally to set up the transparent medium of one deck, part quantity has been reduced, moreover, the steam generator is compact in structure, and embedded structure has reduced optical module shared space in wearable equipment greatly, reduce the extravagant condition of equipment inner space, be favorable to realizing the miniaturization of equipment, especially be TWS earphone to wearable equipment, the miniaturization advantage is more obvious. And, optical module send and receive light only need pass the printing opacity district of apron can, and need not additionally pass the transparent medium of shell, the light efficiency loss is little, and optical module's luminous efficiency is higher, and optical module can obtain stronger light signal with littleer components and parts drive current, has reduced the consumption.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of an optical device according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of an optical module in an optical device according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of an optical module in an optical device according to an embodiment of the present invention;

fig. 4 is a sectional view of an optical module and a housing of an optical device according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of an optical device according to an embodiment of the present invention, the optical device being provided with a scratch-resistant layer;

fig. 6 is another schematic cross-sectional view of an optical module in an optical device according to an embodiment of the present invention;

fig. 7 is an assembled perspective view of an optical module and a housing in an optical device according to an embodiment of the present invention.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied.

The present invention is described in the directions "up", "down", "left", "right", etc. with reference to the direction shown in fig. 1, and is only used to explain the relative positional relationship between the components in the posture shown in fig. 1, and if the specific posture is changed, the directional indication is also changed accordingly.

The utility model provides an optical device.

In the embodiment of the present invention, as shown in fig. 1 to 7, the optical device 100 includes a housing 10 and an optical module 20, wherein the housing 10 has a cavity 11 therein, and the housing 10 is provided with a window 12 communicated with the cavity 11; the optical module 20 is accommodated in the cavity 11, the optical module 20 comprises a substrate 21, a component 22 and a cover plate 23, the cover plate 23 is arranged on the substrate 21 in a covering manner, an accommodating space 24 is formed between the cover plate 23 and the substrate 21, and the component 22 is accommodated in the accommodating space 24; the side of the cover plate 23 facing away from the base plate 21 protrudes toward the window 12 and is embedded in the window 12 to block the window 12, and the position of the cover plate 23 corresponding to the window 12 has a light-transmitting area.

The optical module 20 of this embodiment can be used on wearable device, for example, on bracelet, wrist-watch or earphone, and after bracelet or wrist-watch were worn on human wrist, window 12 was located wearable device's inboard, and window 12 faces human skin side one side promptly. As shown in fig. 1, a window 12 is opened at the bottom of the housing 10, a cover plate 23 of the optical module 20 is located at the bottom of the substrate 21, and the lower side of the cover plate 23 protrudes downward and is embedded in the window 12, so that the window 12 is sealed, and the optical module 20 and the housing 10 are assembled.

It will be appreciated that the components 22 of the optical module 20 may be used to receive light. Optical module 20 monitors human rhythm of the heart through the photoelectric projection measuring method, through components and parts 22 promptly, sends light through for example the LED lamp and shines the skin, because blood has the absorption to the light of specific wavelength, when the heart pump blood at every turn, this wavelength all can be absorbed by a large amount to this just can confirm the heartbeat, realizes the monitoring to human rhythm of the heart. The monitoring of blood oxygen of human body is similar to heart rate monitoring, and is not repeated herein. The position that the apron 23 of this embodiment corresponds window 12 has the printing opacity district, and the light that components and parts 22 sent shines human skin through the printing opacity district, and the light through human skin reflection passes through the printing opacity district and is received by components and parts 22 to realize optical module 20 to the monitoring of human rhythm of the heart, blood oxygen.

In this embodiment optical device 100, the cover plate 23 of the optical module 20 protrudes and is embedded in the window 12 to plug the window 12, the cover plate 23 can be directly used as an optical window of the wearable device, the position of the window 12 of the housing 10 does not need to be additionally provided with a layer of transparent medium, the number of parts is reduced, the structure is compact, and the embedded structure greatly reduces the space occupied by the optical module 20 in the wearable device, reduce the waste of the internal space of the device, which is beneficial to realizing the miniaturization of the device, especially for the TWS earphone of the wearable device, the miniaturization advantage is more obvious. Moreover, the optical module 20 only needs to transmit and receive light rays through the light-transmitting area of the cover plate 23, and does not need to additionally pass through a transparent medium of the shell 10, so that the light effect loss is small, the light emitting efficiency of the optical module 20 is higher, the optical module 20 can obtain stronger light signals by using smaller component 22 driving current, and the power consumption is reduced.

Further, the cover plate 23 of the present embodiment includes a light shielding plate 231 and a light transmitting block 232, one end of the light shielding plate 231 is installed on the substrate 21, the other end of the light shielding plate 231 protrudes toward the window 12 and is embedded at the window 12, the light shielding plate 231 is enclosed to form an accommodating space 24, one side of the accommodating space 24 facing the window 12 is provided with an opening 241, the light transmitting block 232 is installed at the opening 241 and seals the opening 241, and the light transmitting block 232 forms a light transmitting area.

The light shielding plate 231 of the present embodiment is embedded at the window 12 of the housing 10 to seal the window 12. The light-transmitting block 232 is arranged at the opening 241 of the accommodating space 24 enclosed by the light-shielding plate 231, so that the light-transmitting block 232 and the light-shielding plate 231 are assembled, the light-transmitting block 232 forms a light-transmitting area, light transmission is facilitated, and light receiving and transmitting of the component 22 in the accommodating space 24 are realized.

The light shielding plate 231 and the light transmitting block 232 of the present embodiment are integrally formed by two-shot molding, two-shot molding or encapsulation. Specifically, the light shielding plate 231 of the embodiment may be made of PA (Polyamide), ABS (Acrylonitrile Butadiene Styrene), etc., the light transmitting block 232 may be made of PMMC (polymethyl methacrylate), PC (Polycarbonate), etc., and the light shielding plate 231 of the cover plate 23 and the light transmitting block 232 are integrally formed by two-color injection molding, secondary injection molding or encapsulation, which not only omits the assembly step, improves the production efficiency, but also avoids the assembly error, improves the consistency of the finished product, and is beneficial to improving the accuracy of the measurement algorithm.

Moreover, the light shielding plate 231 and the light transmitting block 232 are integrally formed by a double-shot injection molding, secondary injection molding or encapsulation process, so that a complex structure matched with the shape of the housing 10 can be formed, for example, after the cover plate 23 is embedded at the window 12, the outer surface of the cover plate 23 is fitted with the outer surface of the housing 10, and can be smoothly and transitionally connected into an integrated surface, specifically, when the outer surface of the housing 10 is a plane, the outer surface of the cover plate 23 is flush with the outer surface of the housing 10, so that an integrated smooth plane is formed; when the outer surface of the housing 10 is a curved surface, the outer surface of the cover plate 23 is also a curved surface, and forms an integrated optical curved surface with the outer surface of the housing 10, so that the optical curved surface is flexible and convenient, and meets various use requirements.

In this embodiment, the optical module 20 has a plurality of receiving spaces 24 arranged at intervals, any two adjacent receiving spaces 24 are separated by a light shielding plate 231, and each receiving space 24 is correspondingly provided with a light transmitting block 232; the component 22 includes a light emitting element 221 and a light receiving element 222, and the light emitting element 221 and the light receiving element 222 are separately provided in different housing spaces 24. The light emitting element 221 of the present embodiment is an LED lamp, the light receiving element 222 is a PD, and the LED and the light receiving element 222 are separately provided in different housing spaces 24.

As shown in fig. 1 to 5, the number of the receiving spaces 24 is four, the four receiving spaces 24 are arranged at intervals in the left-right direction, and the first, second, third, and fourth receiving spaces 24 are respectively arranged from left to right, wherein the second receiving space 24 and the fourth receiving space 24 are respectively provided with a light emitting element 221, such as an LED lamp, and the first receiving space 24 and the third receiving space 24 are respectively provided with a light receiving element 222, such as a PD, light emitted from the LED irradiates the skin of a human body, and is reflected and received by the PD adjacent to the LED.

In addition, the opening 241 of the accommodating space 24 is blocked by the light-transmitting block 232, any two adjacent accommodating spaces 24 are separated by the light-shielding plate 231, so that the periphery of the light-transmitting block 232 is surrounded by the light-shielding plate 231, the light-shielding plate 231 is completely divided by the light-transmitting block 232, the light crosstalk between the light-transmitting block 232 and the light-shielding plate cannot occur, the signal to noise ratio is improved, and the accuracy of a measurement signal is improved.

In this embodiment, the light shielding plate 231 is adhered to the substrate 21 by the adhesive 30, the substrate 21 is provided with a vent hole 211 corresponding to the accommodating space 24, the vent hole 211 is used for communicating the accommodating space 24 with the cavity 11, and the vent hole 211 is filled with an adhesive for sealing the through hole.

Specifically, the integrally formed cover plate 23 is attached to the substrate 21 by means of a scribing and SMT process, and is cured at a high temperature by curing the adhesive 30 between the light shielding plate 231 of the cover plate 23 and the substrate 21, so as to improve the assembly stability of the cover plate 23 and the substrate 21. In order to balance the air pressure in the accommodating space 24 and the cavity 11 during the high-temperature curing process and prevent the cover plate 23 from being separated from the substrate 21 due to gas expansion, the vent hole 211 is formed in the substrate 21 at a position corresponding to the accommodating space 24, the vent hole 211 communicates the accommodating space 24 and the cavity 11, and the air pressure in the accommodating space 24 and the cavity 11 can be balanced during the high-temperature curing process. After the high temperature curing is finished, the viscose is injected into the vent holes 211 from the outer side of the base plate 21, the viscose can be selected from UV glue, the UV glue seals the through holes, the assembling sealing performance of the cover plate 23 and the shell 10 is guaranteed, and the light leakage phenomenon is prevented. It can be understood that the adhesive is UV glue, and UV irradiation curing treatment is performed after the UV glue is filled into the vent holes 211, so as to optimize the sealing effect.

In this embodiment, the side wall of the window 12 forms an inclined surface 121, the inclined surface 121 is tapered in a direction away from the cavity 11, and the outer wall of the cover plate 23 forms a slope surface 2311 matching and abutting against the inclined surface 121. As shown in fig. 1 to 5, the inclined surface 121 is tapered from top to bottom, that is, the size of the window 12 on the housing 10 is gradually reduced from top to bottom, and the outer wall of the cover plate 23 forms a slope surface 2311, the slope surface 2311 is matched with the inclined surface 121 and is abutted against each other, specifically, the slope surface 2311 and the inclined surface 121 are adhered together by an adhesive 30, and the adhesive 30 may be epoxy resin with low water absorption rate, or the like. Slope 2311 and inclined plane 121 bond the cooperation and both be convenient for and realize the embedded assembly of apron 23 and shell 10, can play the positioning action again in the assembling process, reduce the assembly error between apron 23 and the shell 10, and then keep optical module 20's FOV angle invariable, the uniformity of different finished products is more excellent, further improves measurement algorithm's precision. It can be understood that the slope surface 2311 of the cover plate 23 is a draft plane, the inclination angle of the slope surface 2311 is a draft angle, the draft angle ranges from 5 to 25 °, and the inclination angle of the slope surface 2311 of the window 12 are the same.

In order to improve the assembling convenience of the cover plate 23 and the housing 10, the cover plate 23 is formed with a step 2312, the edge of the housing 10 where the window 12 is located is installed on the step 2312, and the corner of the step 2312 is provided with a sealing ring 40 for sealing the step 2312 and the housing 10, so that the assembling tightness of the cover plate 23 and the housing 10 is improved while the assembling is facilitated.

In this embodiment, the optical module 20 further includes a connector 25, the connector 25 is mounted on a side of the substrate 21 away from the receiving space 24; the housing 10 and the optical module 20 are positioned and mounted by the heat-melting column 26. As shown in fig. 1, the connector 25 is attached to the upper side of the substrate 21 and located outside the accommodating space 24, the optical module 20 can form stable electrical connection with the main board of the wearable device by using the connector 25 to form communication and power supply, and the optical module 20 does not need to be attached to an FPC or a PCB, and the position thereof can be flexibly set according to actual conditions. In addition, in the process of assembling the housing 10 and the optical module 20, the positioning function can be achieved by arranging the heat-melting column 26, so that the assembling accuracy of the housing 10 and the optical module 20 is improved. The heat-fusible pillars 26 are provided on the upper side of the substrate 21, and after the housing 10 and the optical module 20 are assembled, the heat-fusible pillars 26 may be eliminated.

The substrate 21 of the optical module 20 of this embodiment may further mount a plurality of functional chips 27, and the plurality of functional chips 27 may be an AFE chip, an acceleration chip, an ECG chip, a temperature sensor chip, a resistor, a capacitor, an inductor, and the like of PPG, respectively, so that the optical module 20 may perform operations such as amplification, filtering, analog-to-digital conversion, and the like on a received signal, or integrate other functions with the optical module 20. The functional chip 27 may be attached to the upper surface of the substrate 21, attached to the lower surface of the substrate 21 and located outside the accommodating space 24, or attached to the lower surface of the substrate 21 and located in the accommodating space 24, and stacked with the light emitting element 221 or the light receiving element 222 in the up-down direction. The type and mounting position of the functional chip 27 can be flexibly selected according to the actual situation. The cover plate 23, the light emitting element 221, the light receiving element 222, the connector 25 and the plurality of functional chips 27 of the optical module 20 of the present embodiment are all unpackaged dies.

As shown in fig. 1, 4 and 7, in the present embodiment, the outer surface of the housing 10 and the surface of the cover plate 23 facing away from the cavity 11 are smoothly and transitionally connected into an integral surface, and the integral surface is provided with a scratch-resistant layer 50. The surface of the cover plate 23 facing away from the cavity 11 is the outer surface of the cover plate 23, and the outer surface of the cover plate 23 and the outer surface of the housing 10 are connected into a whole in a smooth transition manner. It can be understood that when the outer surface of the housing 10 is other shaped surfaces, the outer surface of the cover plate 23 can be smoothly and transitionally connected with the outer surface of the housing 10 to form an integral surface all the time, which meets different requirements of use.

After the optical module 20 is assembled with the housing 10, the outer surface of the cover plate 23 is directly coupled to the window 12 of the housing 10, the cover plate 23 can be used as a part of the housing 10, so as to improve the structural compactness of the optical device 100, and the light receiving element 222 and the light emitting element 221 of the optical module 20 are closer to the outer surface of the housing 10, and further closer to the skin of the human body, which is also beneficial to improving the measurement accuracy.

After the optical module 20 and the housing 10 are assembled, a layer of transparent optical UV glue with shore hardness of above D70 is coated on the surface of the optical device 100, that is, the outer surface of the cover plate 23 and the outer surface of the housing 10, and the thickness is about 30um, so as to form the scratch-resistant layer 50, thereby improving the scratch-resistant performance of the optical device 100, improving the sealing performance of the optical device, and improving the appearance aesthetic property of the optical device 100. In addition, the scratch-resistant layer 50 has a small thickness, so that the light collecting and releasing conditions of the optical module 20 are not affected.

The invention further provides a wearable device, which includes the optical apparatus 100. It can be understood that the wearable device can be an electronic product such as a smart watch, a bracelet, and an earphone. Since the wearable device adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and are not repeated herein.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. An optical device, comprising:

2. The optical device according to claim 1, wherein the cover plate includes a light shielding plate and a light transmitting block, one end of the light shielding plate is mounted on the substrate, the other end of the light shielding plate protrudes toward the window and is embedded in the window, the light shielding plate is enclosed into the accommodating space, one side of the accommodating space facing the window has an opening, the light transmitting block is mounted at the opening and blocks the opening, and the light transmitting block forms the light transmitting region.

3. The optical device of claim 2, wherein the light shielding plate and the light-transmitting block are integrally formed by two-shot molding, two-shot molding or encapsulation.

4. The optical device according to claim 2, wherein the optical module has a plurality of receiving spaces arranged at intervals, any two adjacent receiving spaces are separated by the light shielding plate, and each receiving space is provided with one of the light-transmitting blocks; the component comprises a light-emitting element and a light-receiving element, and the light-emitting element and the light-receiving element are respectively arranged in different accommodating spaces.

5. The optical device according to claim 2, wherein the light shielding plate is bonded to the substrate by an adhesive, a vent hole is formed in the substrate at a position corresponding to the receiving space, the vent hole is used for communicating the receiving space with the cavity, and the vent hole is filled with an adhesive which seals the vent hole.

6. The optical device according to any one of claims 1 to 5, wherein the side wall of the window forms an inclined surface that tapers away from the cavity, and the outer wall of the cover plate forms a ramp surface that mates with and abuts the inclined surface.

7. The optical device according to any one of claims 1 to 5, wherein the cover plate is formed with a step, the edge of the housing where the window is located is mounted on the step, and a sealing ring for sealing the step and the housing is provided at a corner of the step.

8. The optical device according to any one of claims 1 to 5, wherein the optical module further comprises a connector mounted on a side of the substrate facing away from the receiving space;

and the number of the first and second electrodes,

9. An optical device as claimed in any one of claims 1 to 5, characterized in that the outer surface of the housing and the surface of the cover plate facing away from the cavity are smoothly blended into a single surface, and the single surface is provided with a scratch-resistant layer.

10. A wearable device, characterized in that the wearable device comprises an optical apparatus according to any of claims 1-9.