KR102605607B1 - Ppg sensor package - Google Patents

Abstract

A PPG sensor package is disclosed. A PPG sensor package according to an embodiment of the present invention includes a base substrate; A light emitting module coupled to the top of the base substrate; A light receiving module is coupled to the upper part of the base substrate and arranged to be spaced apart from the outside around the light emitting module; It is disposed between the light-emitting module and the light-receiving module, and includes a light-shielding module that blocks light between the light-emitting module and the light-receiving module centered on the light-emitting module to form a receiving space.

Description

PPG sensor package {PPG SENSOR PACKAGE}

The present invention relates to a PPG sensor package, and more specifically, to a PPG sensor package capable of effectively detecting a blood flow signal from a PPG signal by reducing the deviation of a received optical signal and amplifying the intensity of the signal.

With the recent increase in interest in health care, there is a growing interest in and demand for healthcare devices that can check and manage one's health anytime, anywhere, not only in hospitals.

Among them, photoplethysmography (Photo-Electromyography or PhotoPlethysmoGraphy: hereinafter referred to as PPG) is a method of measuring health information such as heart rate by measuring blood flow through blood vessels.

This type of photoplethysmography device can easily measure heart rate information. It measures heart rate through changes in the volume of blood vessels that occur during the relaxation and contraction of the heart. Usually, red or infrared light is irradiated to the blood vessels and is transmitted or reflected to the blood vessels. Heart rate can be measured by measuring the change in red or infrared light (change in blood flow).

However, photoplethysmography as described above has many difficulties in measuring heart rate reliably due to individual physical differences caused by fixed placement of the heart rate sensor (PPG sensor) at a certain point due to motion noise caused by movement and individual physical differences. come.

Additionally, PPG is a method of extracting information related to heartbeat using a predetermined number of LEDs and photodetectors, and the PPG signal has the disadvantage of causing large-amplitude motion noise even with slight movement.

This motion noise can be defined as a noise signal caused by body tremors and small movements when detecting heart rate, and removal of motion noise is required for highly reliable heart rate measurement.

Therefore, the existing photoplethysmography measurement had a limitation in that it was difficult to detect an accurate signal while the user was moving, making effective heart rate detection impossible.

In addition, the existing optical blood flow measurement was set up without dividing the wavelength band, so it had the disadvantage of not being able to utilize the optical characteristics of a specific wavelength band, and the inability to utilize a dedicated transmitting and receiving device and the low efficiency of transmitting and receiving light, resulting in various There were difficulties in applying healthcare wearable devices suitable for their intended use.

Korean Patent Publication No. 10-2009-0067549 (published on June 25, 2009)

The problem that the present invention aims to solve is to reduce the deviation of the optical signal according to the wavelength of light, amplify the intensity of the signal, enable effective blood flow signal detection from the PPG signal, and utilize a multi-directional optical path to achieve signal detection accuracy. provides an excellent PPG sensor package.

According to one aspect of the present invention, a base substrate; A light emitting module coupled to the top of the base substrate; a light receiving module coupled to the upper part of the base substrate and arranged to be spaced apart from the outside around the light emitting module; And a PPG sensor package including a light-shielding module disposed between the light-emitting module and the light-receiving module and forming a receiving space by blocking light between the light-emitting module and the light-receiving module centered on the light-emitting module.

The light emitting module is in the form of a plurality of divided pieces, and includes a first light emitting unit that outputs light in a first wavelength band of 400 nm to 900 nm; a second light emitting unit that outputs light with a longer wavelength than the wavelength band output by the first light emitting unit; and a third light emitting unit that outputs light with a longer wavelength than the wavelength band output by the second light emitting unit.

The light receiving module is in the form of a plurality of equally divided pieces, and includes a first light receiving part that receives the light output from the first light emitting part; a second light receiving unit that receives the light output from the second light emitting unit; and a third light receiving unit that receives the light output from the third light emitting unit, and the light receiving area of the first light receiving unit may be larger than that of the second light receiving unit and the third light receiving unit.

The first light emitting unit may include a plurality of pieces, and each of the second light emitting unit and the third light emitting unit may include one piece.

The first light receiving unit may be an organic photodiode (OPD) in which a plurality of pieces are connected.

Each of the first light emitting unit, the second light emitting unit, and the third light emitting unit may be disposed adjacent to the first light receiving unit, the second light receiving unit, and the third light receiving unit, with the light blocking module interposed therebetween.

The PPG sensor package of the present invention can reduce the deviation of the optical signal according to the wavelength of light and amplify the intensity of the signal, enabling effective blood flow signal detection from the PPG signal, and improving signal detection accuracy by utilizing a multi-directional optical path. It has excellent effects.

Figure 1 is a diagram showing the overall configuration of a PPG sensor package according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a central portion of the PPG sensor package shown in FIG. 1.
Figure 3 is a diagram showing a modified example of the light receiving module of the PPG sensor package.
FIG. 4 is an enlarged view of the PPG sensor package shown in FIG. 1.

In order to fully understand the present invention, its operational advantages, and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In the description of embodiments of the present invention, terms including ordinal numbers such as first, second, etc. may be used to describe various components, but the components are not limited by the terms, and are one component. It is used only for the purpose of distinguishing from other components.

Additionally, in the embodiments of the present invention, singular expressions should be understood to include plural expressions, unless the context clearly indicates otherwise.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings. The same reference numerals in each drawing indicate the same member.

FIG. 1 is a diagram showing the overall configuration of a PPG sensor package according to an embodiment of the present invention, FIG. 2 is a diagram showing a cross section at the central portion of the PPG sensor package shown in FIG. 1, and FIG. 3 is a PPG sensor package. This is a diagram showing a modified example of the light receiving module, and FIG. 4 is an enlarged view of the PPG sensor package shown in FIG. 1.

Hereinafter, the overall configuration of the PPG sensor package according to an embodiment of the present invention shown in FIGS. 1 and 2 will first be described, and then the modified embodiment in FIG. 3 and the detailed configuration in FIG. 4 will be described.

First, as shown in FIG. 1, the PPG sensor package 10 includes a base substrate 100, a light emitting module 300, a light receiving module 500, and a light blocking module 700.

That is, the light emitting module 300 is coupled to the upper part of the base substrate 100, and the light receiving module 500 is arranged to be spaced apart from the outside of the light emitting module 300 with the light emitting module 300 as the center.

Here, the base board 100 is in the form of a circuit board on which the light emitting module 300 and the light receiving module 500 are mounted, and forms the lower surface of the PPG sensor package 10.

Accordingly, the base substrate 100 is electrically connected to elements such as the light-emitting module 300 and the light-receiving module 500 located on it through conductive pads or wiring located on the upper and lower portions of the base substrate 100, thereby transmitting electrical signals. Enables input/output operations with the corresponding device.

This base board 100 may be made of a flexible printed circuit board or a rigid printed circuit board.

Next, the light emitting module 300 emits light and outputs it to the outside of the PPG sensor package 10, which functions to irradiate light to the user's body. The PPG sensor package 10 measures the blood vessel thickness according to the heartbeat. It uses the fact that the degree of absorption and reflection of light changes depending on the change.

The PPG sensor package 10 is capable of detecting a blood flow signal (heart rate) by detecting light emitted from the light emitting surface of the light emitting module 300 and reflected from the user's body, and can detect a blood flow signal (heart rate) in a wide wavelength range or multiple wavelengths. One or more parts capable of emitting light in a range may be provided.

The light emitting module 300 basically has the function of emitting light in all directions, and the light emitted from the light emitting module 300 is reflected by the user's body (blood vessels, etc.) for which blood flow signals are to be detected through the PPG sensor. .

The light emitting module 300 can use various light sources that can detect changes in blood vessel thickness by irradiating light, examples include light emitting diodes (LEDs), organic light emitting diodes (OLEDs), and infrared emitting diodes. and a laser diode.

If such a light source is used, the light emitting module 300 can emit light in the infrared or green light wavelength band.

Meanwhile, when the PPG sensor package 10 is used for proximity detection, the light emitted and received by the light emitting module 300 and the light receiving module 500 is illustratively in the infrared band of 700 nm to 1100 nm and the visible band of 350 nm to 750 nm. A wavelength band including a light band or a wavelength band of light including an ultraviolet band of 400 nm or less may be used.

When the light emitting module 300 emits infrared rays, the heart rate can be measured by measuring the amount of infrared absorption of red blood cells in the blood vessels.

Additionally, when the light emitting module 300 emits green light, red blood cells present in blood vessels tend to absorb green light, so the heart rate can be measured by measuring the amount of green light absorbed.

The light emitting module 300 may include at least one light emitting unit that emits light within the PPG sensor package 10. Although four light emitting units are shown as an example in FIG. 1, if two or more light emitting units are included, the light emitting unit 300 may emit light. Units can be arranged spaced apart from each other in various forms.

The light emitting module 300 may be composed of unit pieces having a specific unit area, and the number of unit pieces may be smaller than that of the light receiving module 500.

If the PPG sensor package (100) is used in this way, the power supplied can be minimized, but the amount of light received through the light receiving module (500) can be significantly increased, thereby improving the efficiency of the device being used.

Details of the light emitting module 300 will be described later.

Meanwhile, the light receiving module 500 is coupled to the upper part of the base substrate 100 and arranged spaced apart on the outside with the light emitting module 300 as the center, and is a part that can receive light in a wide wavelength range or multiple wavelength ranges. One or more of these may be provided.

The light emitted from the light emitting module 300 is reflected by a sensing target located outside the PPG sensor package 10 and is incident toward the light receiving module 500.

In this case, if the light receiving module 500 forms a structure arranged to surround the light emitting module 300, the light receiving efficiency can be significantly improved because less part is lost to the outside.

Here, the light receiving module 500 is arranged to be spaced apart on the outside based on the center point of the light emitting module 300, and is exemplarily arranged based on the center point of the light emitting module 300, as in an embodiment of the present invention in FIG. The light receiving units of eight unit pieces may be arranged in a symmetrical manner.

If the light receiving module 500 is biased to one area at a specific location rather than at an equal distance from the light emitting module 300, a deviation in the receiving sensitivity of an even optical signal occurs, and the light receiving efficiency is low, making it difficult to accurately and precisely transmit the PPG signal. Because it is difficult to measure, it can be placed in an evenly divided form.

However, unlike the above case, if the light receiving module 500 is used biased to one area of a specific location, there is also an example of use in which a specific light emitting unit and light receiving unit can be used for exclusive purposes to increase optical transmission and reception efficiency for a certain wavelength band.

The light receiving module 500 receives an optical signal by detecting light emitted from the light emitting module 300 and reflected from the user's body, and generates a current signal for the received optical signal.

That is, the light receiving module 500 functions to receive an optical signal about the blood flow of the user's body and generate a current signal about health information such as heart rate.

The light receiving module 500 is capable of receiving optical signals by detecting light irradiated and reflected by the user's body, and is commonly used in the relevant technology field. Examples of application include organic photodiode (OPD) and silicon. It may be any one of photodiodes.

Next, the light blocking module 700 is disposed between the light emitting module 300 and the light receiving module 500, and accommodates the light between the light emitting module 300 and the light receiving module 500 with the light emitting module 300 as the center. It plays a role in forming space.

The light blocking module 700 has light blocking properties and may be made of a material that blocks light. The light blocking module 700 may block light between the light emitting module 300 and the light receiving module 500. It may be formed as a ring type between the light emitting module 300 and the light receiving module 500.

In this regard, referring to the cross-sectional view of the PPG sensor package 10 in FIG. 2, the light-shielding module 700 is formed between the light-emitting module 300 and the light-receiving module 500, with the light-emitting module 300 as the center. It may be formed in a ring type to surround the light emitting module 300.

In addition, the vertical height of the light blocking module 700 from the base substrate 100 is higher than the height of the light emitting module 300 and the light receiving module 500, and through this, the light blocking module 700 is connected to the light emitting module 300. Light can be shielded more efficiently between the light receiving modules 500.

According to one embodiment of the present invention, although not shown in the drawings, the light blocking module 700 may be a divided ring type formed between the light emitting module 300 and the light receiving module 500 with the light emitting module 300 as the center. there is.

In one embodiment of the present invention, the split ring type (or 'split-ring type') refers to a ring-type shape, where the ring is divided into two or more pieces.

At this time, 'split' means divided into a plurality of pieces, and may mean divided in a direction perpendicular to the circumference of the ring.

In other words, as an example, the split-ring type can exist as a minimum of 2 pieces, so it can be called a 2-split-ring type, and similarly, if it exists with 3 pieces, it can be called a 3-split-ring type. Furthermore, if it exists as n pieces, it can be said to be an n split-ring type.

The light blocking module 700 may be composed of a plurality of pieces corresponding to a plurality of divided pieces of the light receiving module 500. At this time, 'corresponding to a plurality of pieces' means that each piece of the light receiving module 500 is formed substantially parallel to each piece of the light blocking module 700 in correspondence with the number of divisions, division positions, etc. It can mean.

Meanwhile, the PPG sensor package 10 according to an embodiment of the present invention may further include a cover located on the upper side of the light blocking module 700 and an adhesive layer for bonding the cover and the light blocking module 700.

This cover can be made of glass or colorless transparent polyimide, and the light-emitting module 300 and light-receiving module 500 located inside the PPG sensor package 10 are protected from external impacts or foreign substances, thereby increasing the lifespan. .

If a cover made of polyimide is used compared to a cover made of glass, the PPG sensor package 10 is easier to install because it is lighter, the load transmitted to the partition is reduced, and manufacturing costs are reduced.

As an application example, the adhesive layer may be a general adhesive film or may be made of a die attach film (DAF).

In general, DAF is a film that is attached to the bottom of a die, and has the advantage of being very thin and having a consistent thickness compared to using polymer-based materials.

Hereinafter, details of the light emitting module 300 and the light receiving module 500 will be described.

First, the light emitting module 300 may be arranged in the form of a plurality of pieces divided into pieces, and the light emitting module 300 includes a first light emitting unit 310, a second light emitting unit 330, and a third light emitting unit 350. ) includes.

The first light emitting unit 310 outputs light in a first wavelength band, which is a 400 nm to 900 nm wavelength band, and the second light emitting unit 330 outputs light with a longer wavelength than the wavelength band output by the first light emitting unit 310. The third light emitting unit 350 outputs light with a longer wavelength than the wavelength band output by the second light emitting unit 330.

Here, this means that the length of the wavelength transmitted by each of the first light emitting unit 310, the second light emitting unit 330, and the third light emitting unit 350 is relatively long and short.

Since the second light emitting unit 330 has a longer wavelength band than the first light emitting unit 310 and the third light emitting unit 350 has a longer wavelength band than the second light emitting unit 330, exemplarily, the second light emitting unit 330 The light emitting unit 330 can output light in the 900 nm to 1450 nm wavelength band, and the third light emitting unit 350 can output light in the 1450 nm to 2000 nm wavelength band, and it is obvious that the scope of the present invention is not limited thereto.

Here, the first light emitting unit 310 itself includes a plurality of pieces, and each of the second light emitting unit 330 and the third light emitting unit 350 may include one piece.

If it is composed of a plurality like this, the first light emitting unit 310 divides the light in various wavelength bands, so there is an advantage that the light of 400 nm to 900 nm output by the first light emitting unit 310 can be divided and output more finely. there is.

Even in this case, each of the second light emitting unit 330 and the third light emitting unit 350 may be implemented as one. If an embodiment of the present invention is configured in this way, there is a second light emitting unit 330 and a third light emitting unit 350 in addition to the light of 400 nm to 900 nm, so it is possible to arrange a dedicated light emitting unit for each wavelength band.

In other words, if each light emitting part is configured with a different color, the transmission and reception of light in various wavelength bands can be distributed in various ways, which can be utilized for various purposes in healthcare products.

Accordingly, although the light emitting module 300 has been described as being composed of three light emitting units in one embodiment of the present invention, it is obvious that it may be composed of a plurality of light emitting units or more than three light emitting units.

In addition, the light receiving module 500 may be arranged in the form of a plurality of equally divided pieces. In this case, the light receiving module 500 includes the first light receiving part 510, the second light receiving part 530, and the third light receiving part 550. Includes.

For reference, the light receiving module 500 is also composed of three light receiving units according to an embodiment of the present invention, but it is obvious that, like the light emitting module 300, it may be composed of a plurality of light receiving units or more than three light receiving units.

The first light receiving unit 510 receives the light output from the first light emitting unit 310, the second light receiving unit 530 receives the light output from the second light emitting unit 330, and the third light receiving unit 550 receives the light output from the third light emitting unit 350.

Here, the light receiving area of the first light receiving unit 510 is formed to be larger than that of the second light receiving unit 530 and the third light receiving unit 550.

For reference, in one embodiment of the present invention, the large light receiving area means that when the components of the light receiving unit are composed of the same unit piece with a certain area, the first light receiving unit 510 is composed of a plurality of unit pieces. It means that the area receiving light is large because the number of unit numbers is greater.

If the first light receiving unit 510, the second light receiving unit 530, and the third light receiving unit 550 are divided into pieces, the number of pieces may be the same, but in this case, they are not made of unit pieces of the same area, but the difference in area It means that it is implemented in various forms of pieces.

Meanwhile, the first light receiving unit 510 may be implemented as an organic photodiode (OPD) in which a plurality of pieces are connected.

For reference, organic photodiode (OPD) is based on organic materials and is a device that can replace photodetectors. It improves the light sensitivity of electronic devices such as cameras, and is used when investigating whether displays can be produced with uniform color composition. can be used

In particular, organic materials may have sensitivity only in a specific wavelength range (ex: red light, green light, blue light, etc.) depending on the material of the organic material, so select an appropriate material for the intended use to determine the spectrum of the PPG sensor package 10. Sensitivity can be adjusted.

In addition, compared to inorganic materials, it is significantly lighter, can reduce production costs, and has flexible characteristics, so it can be used in various wearable devices such as smartphones and smartwatches.

Therefore, when using an organic photodiode (OPD) as a light receiving unit, there is an advantage in that the structure of the light receiving unit can be designed without restrictions on area and shape due to its characteristics, so the arrangement of the light emitting module 300 and the light receiving module 500 of the present invention There are useful advantages in forming .

Accordingly, the light receiving module 500 can be formed in a structure surrounding the light emitting module 300, and the amount of light received through the light receiving module 500 can be significantly increased in the same product size, thereby ensuring accurate PPG signals and It can be measured precisely.

In addition, organic photodiode (OPD) can reduce the deviation of reception sensitivity of optical signals and utilize a multi-directional optical path rather than a unidirectional path, so it has the effect of forming an optimal sensing environment even under the user's movement. .

According to another embodiment of the present invention, the first light receiving unit 510 may be a silicon photodiode.

When using a silicon photodiode as above, the light receiving part can be formed as a ring type or split-ring type, so the light receiving part can be arranged in a structure surrounding the light emitting part.

Accordingly, the amount of light received through the light receiving unit can be significantly increased, allowing the PPG signal to be measured accurately and precisely. In addition, it is possible to utilize a multi-directional optical path rather than a unidirectional path, and the deviation in reception sensitivity of optical signals can be reduced, which has the effect of forming an optimal sensing environment even under the user's movement.

According to one embodiment of the present invention, the light receiving unit may be a split-ring type made up of a plurality of divided pieces. Here, the split-ring type refers to a ring type shape, where the ring is divided into two or more pieces. means.

That is, the light receiving part is formed in a ring type with the light emitting part as the center, but the ring may be divided into several pieces and divided into a plurality of ring types. In this way, when the light receiving part is formed as a split-ring type, the light receiving part is formed to surround the light emitting part, significantly improving light receiving efficiency, and a multi-directional optical path can be utilized, allowing accurate and precise measurement of the PPG signal.

In addition, when the light receiving part is formed as a split-ring type, the shock is divided and absorbed because it is composed of a split shape, so durability can be further improved, which has the effect of preventing cracks or breakage due to physical shock.

In this regard, Figure 3 is a layout diagram showing the arrangement of the light receiving unit within the PPG sensor package 10 according to a modified embodiment of the present invention.

Referring to FIG. 3 (a), it can be seen that the light receiving modules 500, which are divided into two different areas with the light emitting unit as the center, are formed to surround the light emitting module 300 in a long arc shape. .

If formed in this way, the long light receiving part 510 formed in an arc shape can receive light of more wavelength bands, and the small light receiving parts 530 and 550 can be used to receive the wavelength band of a specific area.

In addition, referring to FIG. 3 (b), it can be seen that the light receiving modules 500, which are asymmetrically divided into various ways with the light emitting module 300 as the center, are formed to surround the light emitting module 300.

In other words, the light receiving module 500 is formed like a disconnected circumferential ring, but it is obvious that the light receiving part can be formed in the form of an arc of various lengths.

In this way, when the light receiving module 500 is formed as a split-ring type with the light emitting module 300 as the center, each light receiving part constituting the light receiving module 500 can be formed to an appropriate size, making it vulnerable to physical shock. There is an advantage to improving this point.

Accordingly, there is no risk of damage such as breaking or cracking of each light receiving unit even with a small physical impact, and the problem of damage at the processing or distribution stage can be solved. In addition, when installed in a user's wearable device, the risk of failure, such as easily breaking down when the user wears it, can be reduced.

That is, when the light receiving module 500 of the present invention is formed as a split-ring type, all problems such as physical damage can be solved while maintaining excellent light receiving efficiency and the effect of utilizing a multi-directional optical path. I mentioned above that it is effective.

Therefore, the light receiving unit can be formed and arranged in various ways to surround the light emitting unit as a split-ring type. Although not specifically shown in the drawings, the light receiving unit may be made of a plurality of pieces evenly divided with the light emitting unit as the center, or may be made of a plurality of pieces unevenly divided.

At this time, 'split' means that the light receiving part is divided into a plurality of pieces, and may mean that it is divided in a direction perpendicular to the circumference of the ring.

Additionally, 'evenly divided' may mean that all of the plurality of pieces have the same size and shape.

In addition, 'unevenly divided' may mean not only a case where the size and shape of all of the plurality of pieces are different, but also a case where the size and shape of only one of the plurality of pieces are different. Additionally, the 'splitting' described above can be done in a direction perpendicular to the circumference of the ring.

Meanwhile, the first light emitting unit 310, the second light emitting unit 330, and the third light emitting unit 350 are respectively connected to the first light receiving unit 510, the second light receiving unit 530, and the third light receiving unit 550. For this reason, they may be placed adjacently with the light blocking module 700 in between.

Referring to FIG. 4, the first light emitting unit 310 and the first light receiving unit 510, which transmit and receive light, are paired and have a relative distance compared to other light emitting units and light receiving unit pairs in the PPG sensor package, which is an embodiment of the present invention. If they get closer and are located close to each other (if they are located eccentrically close to each other rather than the same distance from the same axis), the reception efficiency can increase due to the closer distance.

That is, exemplarily, the distance D1 between the first light emitting unit 310 and the first light receiving unit 510 is the distance D2 between the second light emitting unit 330 and the second light receiving unit 530, and the 3 If the distance D3 between the light emitting unit 350 and the third light receiving unit 550 is formed smaller than the distance D3 between the first light emitting unit 310 and the first light receiving unit 510, the pairing of the other light emitting unit and the receiving unit may occur due to the short distance between the first light emitting unit 310 and the first light receiving unit 510. Compared to , light reception efficiency may increase.

If various settings can be made between each light emitting unit and light receiving unit, it can be used in various forms according to the characteristics required for each healthcare device.

Likewise, the second light emitting unit 330 and the second light receiving unit 530 are located eccentrically close to each other, and the third light emitting unit 350 and the third light receiving unit 550 are also located eccentrically close to each other. The light emitting unit and the light receiving unit exclusively transmit and receive light of a specific wavelength band, and the PPG sensor package 10 can be designed or utilized separately for various purposes, and the reception efficiency of a specific wavelength band can be increased.

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should be considered to fall within the scope of the claims of the present invention.

10: PPG sensor package
100: base substrate 300: light emitting module
500: light receiving module 700: light blocking module

Claims (6)

base substrate;
A light emitting module coupled to the top of the base substrate;
a light receiving module coupled to the upper part of the base substrate and arranged to be spaced apart from the outside around the light emitting module; and
A light-shielding module disposed between the light-emitting module and the light-receiving module and forming a receiving space by blocking light between the light-emitting module and the light-receiving module with the light-emitting module as the center.
Including,
The light emitting modules are positioned spaced apart from each other, and include a first light emitting unit that outputs light in a first wavelength band, a second light emitting unit that outputs light with a longer wavelength than the wavelength band output by the first light emitting unit, and the second light emitting unit. It includes a third light emitting unit that outputs light with a longer wavelength than the additional output wavelength band,
The light receiving modules are positioned to be spaced apart from each other, and are disposed adjacent to the first light emitting unit with the light blocking module in between. A first light receiving unit that receives the light output from the first light emitting unit, and the light receiving unit with the light blocking module in between. A second light receiving unit disposed adjacent to the second light emitting unit and receiving the light output from the second light emitting unit, and a second light receiving unit disposed adjacent to the third light emitting unit with the light blocking module in between, receiving the light output from the third light emitting unit. It includes a third light receiving unit that receives light,
The distance between the first light emitting unit and the first light receiving unit is different from the distance between the second light emitting unit and the second light receiving unit and the distance between the third light emitting unit and the third light receiving unit.
PPG sensor package. According to paragraph 1,
The first wavelength band is a PPG sensor package in a 400nm to 900nm wavelength band. According to paragraph 1,
A PPG sensor package wherein the light receiving area of the first light receiving unit is larger than that of the second light receiving unit and the third light receiving unit. According to paragraph 1,
The first light emitting unit includes a plurality of pieces, and the second light emitting unit and the third light emitting unit each include one piece. According to paragraph 1,
The first light receiving unit is a PPG sensor package in which a plurality of pieces are connected to an organic photodiode (OPD, Organic Photodiode). delete