TWI605791B - Light-sensing device for wearable devices - Google Patents

Description

Light-sensing device for wearing equipment

The present invention relates to a light sensing device, and more particularly to a light sensing device for a wearable device.

In general, monitoring heart rate is usually divided into three methods. The first method is photoelectric detection, which mainly uses reflected light to detect changes in blood in blood vessels due to small fluctuations. The second method is detection. The method, principle and electrocardiogram of ECG signal are similar, mainly to locate the electrode in the chest and detect the ECG pulse signal. The disadvantage is that it is susceptible to electromagnetic interference, and the electrode must be close to the skin, which is a fatal problem for sports wear; The third way is the vibrating measurement method, which mainly captures the vibration of the body caused by the high-precision sensor, and the disadvantage is that it is not suitable for wearing during exercise.

The mainstream wearable devices on the market, such as the light-sensitive version of the Xiaomi bracelet and the Apple Watch, generally use photoelectric detection. The main reason is low power consumption and relatively low component cost. However, the photoelectric detection method is used for signal sampling. The most direct impact is that the wearer chooses the difference in wearing tightness due to wearing comfort, and has the disadvantage that the signal is unstable and the reliability and stability are insufficient.

Although each manufacturer has a special compensation design, such as using "light" to measure the change of distance, in addition to increasing the power consumption, shortening the standby time of the wearable device, and importantly, using light There are too many restrictions on measuring the distance from the skin. For example, it is easy to have skin color, skin depth, tattoos, etc., and there is also a problem of signal instability.

Furthermore, as shown in FIG. 1, the aforementioned photodetection method is generally disposed at an adjacent position, and is provided with at least one light emitter 91 that emits light, and one light receiver 92 that receives the reflected light. However, since the light is scattered when the light is emitted, the light receiver 92 is easily exposed to the strong interference source formed by the scattered light 911 due to the proximity of the light emitter 91, which affects the accuracy of the signal.

Accordingly, it is an object of the present invention to provide a light sensing device of a wearable device capable of improving reliability and stability.

Thus, the light sensing device of the wearable device of the present invention is adapted to sense a heartbeat change of an animal, the animal comprising a skin surface layer, the light sensing device comprising: a metal member, a light sensing unit, a light guiding unit, and A control unit.

The light sensing unit includes at least one light emitter that emits light toward the skin surface layer along an optical axis direction, and at least one light receiver for receiving the reflected light, the light receiver sends a sensing signal.

The light guiding unit converges the scattering angle of the emitted light relative to the light emitter to cause the emitted light to travel toward the skin surface layer.

The control unit is electrically connected to the light sensing unit and the metal member, and reads a tight fitting signal when the metal member is in the proximal position, and reads a first when the metal member is in the first distal position Responding to the signal, and then calculating a measured value related to the heart rate based on the sensing signal, and executing a preset motion instruction according to the corresponding first response signal.

The utility model has the advantages that: the light guiding unit reduces the scattering and interference of light, and the signal fed back by the metal piece improves the calculation of the heart rate without affecting the wearing comfort due to the adjustment of the wearing tightness. Stability and reliability.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 2, 3 and 4, a first embodiment of the light sensing device of the present invention is mounted to a wearable device 1. The wearable device 1 is a wristband in the present embodiment and comprises an annulus 11 capable of surrounding the skin layer 2 of the animal, and a carrier 12 attached to the annulus 11. The light sensing device comprises a metal member 3, a light sensing unit 4, a light guiding unit 5, and a control unit 6.

The metal member 3 is disposed on the carrier 12 and includes a flat surface 31 facing the skin surface layer 2, a through hole 32 extending through the flat surface 31, two through openings 33 extending through the flat surface 31, and defining respective wears. Two reflecting annulus 34 of the port 33. The reflecting annulus 34 is separated from the plane 31 by an angle θ, and the angle θ is greater than 90 degrees. The metal member 3 is elastically changed with the endless belt 11 at a proximal position L1 (Fig. 7) capable of generating electrical induction with the skin surface layer 2, a first distal end position L2 (Fig. 7), and a The second distal position L3 (as shown in FIG. 7) is moved, and the metal member 3 is further located at a disengagement position that does not cause electrical induction with the skin surface layer 2.

When the metal member 3 is located at the proximal end position L1, the metal member 3 is adjacent to the skin surface layer 2, and when the metal member 3 is located at the first distal end position L2, the metal member 3 is located away from the skin surface layer 2 An extreme position capable of generating electrical induction with the skin surface layer 2, the metal member 3 being located between the skin surface layer 2 and the first distal end position L2 when the metal member 3 is at the second distal end position L3.

Referring to FIG. 4, FIG. 5, and FIG. 6, the light sensing unit 4 includes a light emitter 41 that emits light toward the skin surface layer 2 along an optical axis L direction of one axis, and two light receivers 42 for receiving reflected light. . Each of the light emitters 41 has a transmitting end 411 that is disposed between the respective reflecting annulus 34. The light receiver 42 sends a sensing signal W and has a receiving end 421 that faces the skin surface layer 2 and passes through the port 32 of the metal member 3.

The light guiding unit 5 includes a panel 51 covering the light sensing unit 4 and permeable to light, two light guiding columns 52, and two light conducting media 53. Each of the light guides 52 is disposed between the panel 51 and the transmitting end 411 of the respective light emitter 41. In this embodiment, the light guide columns 52 are integrally formed with the panel 51 and are plastic materials, which may be PC, acrylic, but are not limited thereto. Each of the light guides 52 has a function of converging the scattering angle of the emitted light with respect to the light emitter 41. Each of the light-conducting media 53 is filled between the emitting end 411 of the respective light emitter 41 and the respective light guiding column 52. The refractive index of the light-conducting medium 53 and the refractive index error of the light-guiding column 52 are between -0.5. Preferably, the refractive index of the light-conducting medium 53 is the same as the refractive index of the light-guiding column 52, and the deflection angle of the light can be reduced, and the speed of traveling of the light can be increased.

The control unit 6 is disposed on the carrier 12, and is electrically connected to the light sensing unit 4 and the metal member 3, and reads a tight fitting signal M _on when the metal member 3 is located at the proximal position L1. When the piece 3 is located at the first distal position L2, a first response signal M1 is read, and when the metal piece 3 is located at the second distal position L3, a second response signal M2 is read, where the metal piece 3 is located. Reading a detachment signal M _off when the position is disengaged, and calculating a measured value D related to the heart rate according to the sensing signal W, according to a first compensation mechanism corresponding to the first response signal M1, the measured value D is Basically, a first heart rate value D1 is calculated, and a second heart rate value D2 is calculated based on the measured value D according to a second compensation mechanism corresponding to the second response signal M2, and according to the off signal M _off It is determined that the wearable device is detached from the body 1, and the light sensing unit 4 is controlled to stop the sensing operation.

It should be noted that the foregoing electrical induction may be a capacitive sensing technology, or an electrical induction technology, or a resistance sensing technology, whereby the tight matching signal M _on , the first response signal M1, the second response signal M2, the separation The signal M _{off is} respectively amplified and analogized by one of the capacitance value, the inductance value and the resistance value respectively generated. In this embodiment, the aforementioned electrical induction uses a capacitive sensing technique. Since the general knowledge in the art can infer the details of the expansion based on the above description, it will not be explained.

Referring to FIG. 3 and FIG. 6, when the heartbeat changes of the animal are sensed, the light emitters 41 emit light toward the skin surface layer 2, and at this time, the emitted light passes through the light-conducting media 53 to enter the front side. In the isolometer 52, since the refractive index of the light-conducting medium 53 is close to or the same as the refractive index of the light-guiding column 52, the deflection angle of the emitted light can be reduced, so that most of the emitted light is along the optical axis L. The direction smoothly enters the light guiding columns 52, and reduces the loss caused by the spacing or the joint when the emitted light enters the respective light guiding columns 52 by the respective light emitters 41, and increases the speed of the light traveling.

And because the light guiding columns 52 respectively have the effect of converge the scattering angle of the emitted light, most of the emitted light entering the light guiding columns 52 will follow the optical axis L direction toward the front skin surface 2, and a small portion The emitted light is also reflected after traveling to the reflecting ring faces 34, and continues to travel toward the front skin surface 2 in the direction of the optical axis L, respectively.

Thereby, not only can the loss of the emitted light be effectively reduced, but also the emitted light can be prevented from traveling toward the light receiver 42, and the light energy traveling to the skin surface layer 2 can be greatly improved, so that the light receiver 42 can be smoothly received by the skin. The reflected light reflected from the surface layer 2 obtains a stable sensing signal W.

Referring to FIG. 3, FIG. 6, and FIG. 7, when the wearer adjusts the tightness of the annulus 11 due to the difference in personal preference, the carrier 12 and the panel 51 of the light guiding unit 5 are placed against the panel 51. When the skin surface layer 2, or a gap is formed with the skin surface layer 2, the metal member 3 may have different capacitance changes due to the difference with the skin surface layer 2, whereby the control unit 6 may be based on the tightness generated. The heart rate is calculated by a different mechanism in conjunction with the signal M _on , or the first response signal M1, or the second response signal M2.

For example, when the control unit 6 reads the tight fitting signal M _on , it indicates that the carrier 12 and the panel 51 of the light guiding unit 5 abut on the skin surface layer 2, in this state, due to the light receiving The controller 42 can obtain a stable sensing signal W, whereby the control unit 6 can directly calculate the heart rate-related measured value D according to the sensing signal W without introducing other compensation modes.

When the control unit 6 reads the first response signal M1 or the second response signal M2, it indicates that the carrier 12 and the panel 51 of the light guiding unit 5 form a gap with the skin surface layer 2, and the light receiver 42 It is highly probable that a stable sensing signal W cannot be obtained because of the aforementioned gap, whereby the control unit 6 introduces a first compensation mechanism or a second compensation mechanism, and based on the measured value D, the first heart rate is calculated. The value D1, or the second heart rate value D2.

It should be noted that, in this embodiment, the first compensation mechanism or the second compensation mechanism respectively uses the energy of the lifting light as a means to drive the light sensing unit when the metal member 3 is located at the first distal position. 4 the energy of the light required > the energy of the light required to drive the photosensitive unit 4 when the metal member 3 is at the second distal position > the light perception when the metal member 3 is at the proximal position The energy of the light required by unit 4.

Certainly, the foregoing first compensation mechanism or the second compensation mechanism may also introduce a manner of increasing the sampling frequency or other correction mechanism, thereby improving the stability when acquiring the sensing signal W. Since the general knowledge in the art can infer the details of the expansion based on the above description, it will not be explained.

Referring to FIG. 8, a second embodiment of the present invention is substantially the same as the first embodiment. The difference is that the wearable device 1 further includes a warning device 13 and a communication module 14.

The alerter 13 may be a speaker that transmits sound, or a light-emitting element that transmits bright light, or a display that displays characters, graphics, or a vibrator that generates vibration.

The control unit 6 is electrically connected to the alarm device 13, the light sensing unit 4, the metal member 3, and the communication module 14, and the metal member 3 is read at the proximal position to read a tight fitting signal M _on When the metal member 3 is located at the distal position, a first response signal M is read, and when the metal member 3 is in the disengaged position, a detachment signal M _off is read, and then the heart rate is calculated according to the sensing signal W. a measured value, a warning message is generated based on the first response signal S M, and the wearable device is separated from the skin surface 2, the control unit 4 stops the light-sensing operation based on the sensing signal from the M _off determination. The warning message S cooperates with the warning device 13 to be one of sound, light, text, graphics, and vibration.

When the control unit 6 reads the first response signal M, it indicates that the carrier 12 and the panel 51 of the light guiding unit 5 form a gap with the skin surface layer 2, and the light receiver 42 is likely to be unable due to the aforementioned gap. A stable sensing signal W is obtained, whereby the control unit 6 generates a warning message S to cause the warning message S to propagate through the warning device 13, and warns the wearer that the distance between the carrier 12 and the skin surface layer 2 is abnormal. The tightness of the annulus 2 needs to be adjusted.

At the same time, the control unit 6 can also transmit the warning message S to the third party through the communication module 14, for the third party to assist in adjusting the tightness of the annulus 2, so that the gap between the carrier 12 and the skin surface layer 2 is met. demand. Thereby, the third party can assist the wearer who has no self-care ability, thereby improving the stability when acquiring the sensing signal W.

Through the above description, the advantages of the foregoing embodiments can be summarized as follows:

1. The invention can cooperate with the skin surface layer 1 to change the distance, automatically improve the stability and reliability when calculating the heart rate by using the compensation mechanism, or notify the wearer to adjust the tightness to the demand by the warning message S, and can also improve Stability and reliability when calculating heart rate.

Second, due to the aforementioned compensation mechanism, under the premise that the heart rate calculation has reliability, the wearer can arbitrarily adjust the tightness of the annulus 2 to improve the comfort when wearing for a long time.

3. The invention can obtain the change of the gap with the skin surface layer 2 without affecting the original sensing mode of the light sensing unit 4 by using only one metal member 3, without being affected by skin color, skin depth, tattoo, etc. Interference, not only the sensitivity of sensing, but also low power consumption.

Fourth, it is important that the light guide unit 5 can reduce the scattering and interference of light, not only can effectively reduce the loss of emitted light, but also prevent the emitted light from traveling toward the light receiver 42 and greatly improve the travel to the skin. The light energy of the surface layer 2 can not only obtain a more stable sensing signal W, but also further improve the stability and reliability when calculating the heart rate, and can also greatly reduce the power consumption, so that the endurance of the wearable device is better.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

1‧‧‧Wearing equipment

11‧‧‧环带带

12‧‧‧ Carrier

13‧‧‧ Warning device

14‧‧‧Communication module

2‧‧‧Skin surface

3‧‧‧Metal parts

31‧‧‧ plane

32‧‧‧ mouth

33‧‧‧ wearing a mouth

34‧‧‧Reflecting torus

4‧‧‧Light unit

41‧‧‧Light emitter

411‧‧‧transmitter

42‧‧‧Optical Receiver

421‧‧‧ receiving end

5‧‧‧Light guide unit

51‧‧‧ panel

52‧‧‧Light guide

53‧‧‧Light conducting medium

6‧‧‧Control unit

7‧‧‧Communication module

W‧‧‧Sensing signal

L1‧‧‧ proximal position

L2‧‧‧ first remote location

L3‧‧‧ second remote location

L‧‧‧ distal location

M _on ‧‧‧ tight fit signal

M _off ‧‧‧ off signal

M1‧‧‧ first response signal

M2‧‧‧ second response signal

M‧‧‧First response signal

D‧‧‧Measured value

D1‧‧‧ first heart rate value

D2‧‧‧ second heart rate value

S‧‧‧ warning message

L‧‧‧ optical axis

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a schematic diagram illustrating a light emitter emitted by a general photodetection method and a light receiver receiving light. Figure 2 is a perspective view showing a first embodiment of the light sensing device of the wearable device of the present invention; Figure 3 is a block diagram of the first embodiment; Figure 4 is a bottom view of the first embodiment Figure 5 is a schematic cross-sectional view of the first embodiment; Figure 6 is a schematic cross-sectional view of the first embodiment; Figure 7 is a schematic view showing the positional relationship between the first embodiment and a skin surface layer; Figure 8 is a block diagram showing a second embodiment of the light sensing device of the wearable device of the present invention.

2‧‧‧Skin surface

3‧‧‧Metal parts

31‧‧‧ plane

32‧‧‧ mouth

33‧‧‧ wearing a mouth

34‧‧‧Reflecting torus

4‧‧‧Light unit

42‧‧‧Optical Receiver

421‧‧‧ receiving end

5‧‧‧Light guide unit

51‧‧‧ panel

52‧‧‧Light guide

53‧‧‧Light conducting medium

6‧‧‧Control unit

41‧‧‧Light emitter

411‧‧‧transmitter

L‧‧‧ optical axis

Claims (24)

A light sensing device for a wearable device adapted to sense a heartbeat change of an animal, the animal comprising a skin surface layer, the light sensing device comprising: a metal member in a proximal position capable of generating electrical induction with the skin surface layer Moving between a first distal position, the metal member being adjacent to the skin surface layer, the metal member being away from the skin surface layer at the first distal position; a light sensing unit including a strip At least one light emitter that emits light toward the skin surface layer, and at least one light receiver for receiving reflected light, the light receiver sends a sensing signal; a light guiding unit opposite to the light emitter Converging the scattering angle of the emitted light to cause the emitted light to travel toward the surface layer of the skin; and a control unit electrically connected to the photosensitive unit and the metal member, and reading a tight fitting signal when the metal member is in the proximal position Reading a first response signal when the metal member is in the first distal position, and then calculating a measured value related to the heart rate according to the sensing signal, And executing a preset one of the motion instructions according to the first response signal. The light sensing device of the wearable device of claim 1, wherein the metal member comprises a plane facing the skin surface layer, the light emitter having a transmitting end facing the skin surface layer, the light receiver having an orientation A receiving end of the skin surface. The light sensing device of the wearable device of claim 2, wherein the metal member further comprises at least one through hole penetrating through the plane and passing through the light receiver, and at least one through which the light emitter is worn A piercing. The light sensing device of the wearable device of claim 3, wherein the metal member further comprises a reflective annulus surrounding the emitting end of the light emitter and defining the opening, the reflective annulus capable of reflecting light The light is deflected toward the optical axis and travels toward the skin surface. The light sensing device of the wearable device of claim 4, wherein the reflecting annulus is at an angle from the plane, and the angle is greater than 90 degrees. The light sensing device of the wearable device of claim 3, wherein the light guiding unit comprises at least one light guiding column, the light guiding column is opposite to the emitting end of the light emitting device, and the light emitting device is located on the skin surface layer between. The light sensing device of the wearable device of claim 6, wherein the light guiding unit further comprises a light-conducting medium filled between the emitting end of the light emitter and the light guiding column, and the light-conducting medium is refracted The refractive index error between the rate and the light guide column is between -0.5 and 0.5. The light sensing device of the wearable device of claim 7, wherein the light sensing unit further comprises a plurality of light emitters, the metal member further comprising a plurality of openings, and the light guiding unit further comprises a plurality of guides The light columns, each of which is for the respective light emitters to be placed, each of the light guides being located between the respective light emitters and the skin surface layer relative to the respective emitters of the respective light emitters. The light sensing device of the wearable device of claim 6, wherein the light guiding unit further comprises a panel permeable to light and covering the light sensing unit, the light guiding column being disposed between the panel and the light emitter . The light sensing device of the wearable device of claim 9, wherein the panel of the light guiding unit is integrally formed with the light guiding rod and is a plastic material. The light-sensing device of the wearable device of claim 1, wherein the first response signal and the tight-fit signal are respectively converted by an analogy of one of a capacitance value, an inductance value, and a resistance value respectively generated. The light sensing device of the wearable device of claim 1, wherein the metal member is further located at a disengagement position that does not cause electrical induction with the skin surface layer, and the control unit is located when the metal member is in the disengaged position. A detachment signal is read and the wearable device is determined to be detached from the skin surface layer based on the detachment signal. The light sensing device of the wearable device of claim 12, wherein the control unit controls the light sensing unit to stop the sensing action after reading the detachment signal. The light sensing device of the wearable device of claim 1, wherein the action command executed by the control unit is based on a first compensation mechanism corresponding to the first response signal, and the calculated value is used to calculate a The first heart rate value. The light sensing device of the wearable device of claim 14, wherein the first compensation mechanism is to increase the energy of the light, and the light sensing unit is required when the metal member is located at the first distal position. The energy of the light > the energy of the light required by the light sensing unit when the metal member is in the proximal position. The light sensing device of the wearable device of claim 15, wherein the metal member is further located at a second distal position between the skin surface layer and the first distal end position, and wherein the metal member is located at the second distal end position In the second remote position, the control unit reads a second response signal and calculates a second heart rate value based on the measured value based on a second compensation mechanism corresponding to the second response signal. The light sensing device of the wearable device of claim 16, wherein the second compensation mechanism is configured to increase the energy of the light, and the light sensing unit is required when the metal member is located at the first distal position. Energy of the light> the energy of the light required by the photosensitive unit when the metal member is at the second distal position> the energy of the light required by the photosensitive unit when the metal member is at the proximal position . The light sensing device of the wearable device of claim 1, wherein the action command executed by the control unit generates an alert message according to the first response signal for alerting that the distance between the carrier and the skin surface is abnormal. The light-sensing device of the wearable device of claim 18, the wearable device comprising a carrier on which the light sensing device is mounted, and a warning device disposed on the carrier, wherein the warning message transmits the warning Spread. The light sensing device of the wearable device of claim 19, wherein the warning message is one of sound, light, text, graphics, and vibration. The light sensing device of the wearable device of claim 19, further comprising a communication module electrically connected to the control unit and configured to communicate with a third party, and the control unit further transmits the signal according to the response signal The communication module transmits the warning message to the third party for assistance by the third party to adjust the gap between the carrier and the skin surface layer. A light sensing device for a wearable device adapted to sense a heartbeat change of an animal, the animal comprising a skin surface layer, the light sensing device comprising: a metal member in a proximal position capable of generating electrical induction with the skin surface layer Moving between a first distal position, the metal member being adjacent to the skin surface layer, the metal member being away from the skin surface layer at the first distal position; a light sensing unit including a strip a light emitter that emits light toward the skin surface, and at least one light receiver for receiving the reflected light, the light receiver sends a sensing signal; a light guiding unit including at least one light guiding column, a light guiding column opposite to the emitting end of the light emitter, and located between the light emitter and the skin surface layer for converging the scattering angle of the emitted light to cause the emitted light to travel toward the surface layer of the skin; and a control unit, and the light sense The unit, the metal member is electrically connected, and reads a tight fitting signal when the metal member is in the proximal position, and reads when the metal member is at the first distal position a first response signal, and then calculating a measured value related to the heart rate based on the sensing signal, and executing a preset one of the motion commands according to the first response signal. A light sensing device for a wearable device adapted to sense a heartbeat change of an animal, the animal comprising a skin surface layer, the light sensing device comprising: a metal member in a proximal position capable of generating electrical induction with the skin surface layer Moving between a first distal position, the metal member being adjacent to the skin surface layer, the metal member being away from the skin surface layer at the first distal position; a light sensing unit including a strip a light emitter that emits light toward the skin surface, and at least one light receiver for receiving the reflected light, the light receiver sends a sensing signal; a light guiding unit including at least one light guiding column, a light guiding column opposite to the emitting end of the light emitter, located between the light emitter and the skin surface layer, for blocking an interference source formed by the emitted light toward the light ejector; and a control unit, and the light sensation The unit and the metal member are electrically connected, and a tight fitting signal is read when the metal member is in the proximal position, and a first reading is performed when the metal member is in the first distal position And responding to the signal, and then calculating a measured value related to the heart rate according to the sensing signal, and executing a preset motion instruction according to the first response signal. A light sensing device for a wearable device adapted to sense a heartbeat change of an animal, the animal comprising a skin surface layer, the light sensing device comprising: a metal member in a proximal position capable of generating electrical induction with the skin surface layer Moving between a first distal position, the metal member being adjacent to the skin surface layer, the metal member being away from the skin surface layer at the first distal position; a light sensing unit including a strip a light emitter that emits light toward the surface layer of the skin, and at least one light receiver for receiving the reflected light, the light receiver sends a sensing signal; a light guiding unit that includes the light transmissive and covers the light a panel of the light sensing unit, and a light-conducting medium filled between the emitting end of the light emitting device and the light guiding column, the refractive index of the light-conducting medium and the refractive index error value of the light guiding column are between -0.5 and 0.5 And a control unit electrically connected to the light sensing unit and the metal member, and reading a tight fitting signal when the metal member is in the proximal position, wherein the metal member is located at the first Reading a first end position when the response signal, is then calculated based on the sensing signal a measured value associated with the heart rate, and based on the first response signal performs a predetermined operation command.