CN204520654U - An optical sensing device for heart rate and blood pressure monitor - Google Patents

Abstract

The utility model discloses an optical sensing device for a heart rate and blood pressure monitor, which comprises a light emitting device, an optical lens, a photoelectric receiving tube and a shading black frame, wherein the optical lens comprises a light gathering window positioned above the light emitting device and a light transmitting window positioned above the photoelectric receiving tube; the shading black frame is positioned above the light-emitting device and arranged between the light-gathering window and the light-transmitting window; the light gathering window adopts a Fresnel structure and at least comprises a transmission surface and one or more tooth-shaped reflection surfaces. Because the Fresnel lens with the inclined axis is adopted, the purposes of light condensation and light path turning can be achieved by the aid of a thinner thickness, LED light rays are concentrated and converged to the position of a measured point on skin in an inclined direction, and are reflected by blood vessels in the measured point and then received by the photoelectric receiving tube through the transparent window, so that pulse and blood signals are generated. The optical sensing device has the characteristics of strong signal, low noise, high sensitivity, accuracy, good reliability and the like.

Description

An optical sensing device for heart rate and blood pressure monitor

technical field

The utility model relates to the technical field of optical sensing devices, in particular to an optical sensing device for heart rate and blood pressure monitors.

Background technique

With the increasing pressure of modern urban life, smoking and alcohol, overeating, obesity, insomnia, anxiety and other problems, the pressure on people's heart is also increasing, and the human heart rate carries a lot of information about the health status of the heart and body , Arrhythmia is facing a younger trend, if you do not pay attention to your own health, the consequences will be disastrous. The so-called arrhythmia refers to changes in the normal sequence of pulses that cause the heart to pump blood between the body. Since abnormal heart rhythms may only occur sporadically, it often takes long-term continuous monitoring to detect abnormal heart rhythms. Fast, accurate and smart heart rate and blood pressure monitors are necessary.

The patent document with the publication number CN102046085B proposes an optical sensor device and a method of using the optical sensor device, which proposes a device for sensing characteristics of a catheter (ie blood vessel) in the body and the fluid conveyed in the catheter and methods. It includes an implantable sensor assembly comprising a plurality of emitters and a plurality of detectors for generating a plurality of signals, the emitters and the detectors facing a side of the catheter, the plurality of emitters configured emitting an infrared beam at a frequency selected to be reflected from hemoglobin when the infrared beam impinges on said catheter; each detector is operatively paired with an emitter.

In addition, the patent with the publication number CN103547211A also proposes an optical sensor device, which includes a light emitter that flashes the light of the second wavelength at a specified frequency and irradiates it to the living body, and a light receiving device that receives the light emitted by the living body. device. And the corresponding signal processing circuit and method.

The basic features of these existing optical sensors described in the above patent documents are composed of a light transmitter, a light receiver, and a signal processing circuit. The light emitted by the light transmitter hits the measured object directly without being converged and aligned. The light reflected by the measured object is received by the sensor, and finally the signal is processed. Such a sensor structure has several problems: 1. Because the light-emitting angle of the light-emitting device is relatively large, especially the smaller patch-type light emitters generally have a Lambertian distribution with a beam angle of 120 degrees, which only has a small A small part of the light will hit the desired detection position, be reflected by the blood vessel and then be received by the light receiver. Most of the light is wasted where it is not needed, so the resulting signal is weaker. 2. Due to the relatively large light-emitting angle of the light-emitting device, when some large-angle light passes through the transparent glass window in front of the light transmitter and light receiver, due to the light-guiding effect of the transparent glass window, this part of the light has the opportunity to be inside the window. The back and forth reflections and refractions are then picked up by the light receiver, creating stray light and generating noise. These sensors in the prior art have common technical problems such as low detection sensitivity, poor reliability, and inaccurate detection signals due to their weak signal and high noise.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art, and provide an optical sensing device for heart rate and blood pressure monitors. The sensing device module can be integrated into a watch or a smart wearable device, which can monitor the heart rate and pulse through the skin 24 hours a day. It is composed of a light-emitting device (such as LED light-emitting diode), an optical lens, a photoelectric receiving tube, a light-shielding black frame and a casing. The heart rate and blood pressure monitor using the optical sensing device disclosed in the utility model, its optical lens is a Fresnel lens structure with an oblique axis, which simultaneously plays the role of light gathering, emission and receiving windows, and has strong signal, Low noise, high sensitivity, accuracy, good reliability and so on.

The purpose of this utility model is achieved through the following technical solutions:

An optical sensing device for a heart rate and blood pressure monitor, comprising a light-emitting device 1, an optical lens 2, a photoelectric receiving tube 3 and a light-shielding black frame 4, wherein the optical lens 2 includes a light-gathering window 2a located above the light-emitting device 1 And the light-transmitting window 2b located above the photoelectric receiving tube 3 and the light-gathering window 2a; the light-shielding black frame 4 is located above the light-emitting device 1, and is arranged between the light-gathering window 2a and the light-transmitting window 2b; the light-gathering window 2a is The Fresnel structure includes at least one transmissive surface and one or more serrated reflective surfaces.

Preferably, the optical axis of the light-gathering window 2a is arranged obliquely.

Preferably, the light-transmitting window 2b is a planar structure.

Preferably, the light-shielding black frame 4 and the optical lens 2 are integrally formed by double injection molding.

Preferably, the light-shielding black frame 4 is made of black light-absorbing PMMA resin or other plastic materials that can realize light-tightness, as well as metal materials and various synthetic materials that can realize light-proof.

Preferably, the light-shielding black frame 4 is straight, circular, arc or zigzag.

Preferably, the transmission surface and the tooth-shaped total reflection surface of the light-gathering window 2a are straight strips.

Preferably, the light emitting device 1 is an LED light emitting diode or a laser emitting tube.

Preferably, the light-gathering window 2a is a ruled Fresnel lens, including a first transmission surface 21, a second transmission surface 22, a first total reflection surface 23, a third transmission surface 24 and a second total reflection surface. face 25,

Wherein the first transmission surface 21 is an inclined refracting surface, and its central axis OP forms an angle α with the optical axis OZ perpendicular to the center point O of the light emitting device 1, and the angle α is between 15 degrees and 50 degrees;

At the same time, the focal points of the first transmission surface 21, the first total reflection surface 23, and the second total reflection surface 25 coincide with the central point O of the light emitting device 1, and the first transmission surface 21, the first total reflection surface 23, the second The central axes of the total reflection surfaces 25 are parallel to each other.

Preferably, the angle α is 28.29 degrees.

Preferably, the light-gathering window 2a is a ruled-type Fresnel structure lens, and the side of the light-gathering window 2a close to the light-emitting device 1 is a Fresnel surface, including at least one transmission surface, and more than one tooth-shaped A total reflection surface; the side away from the light emitting device 1 is a toothed total reflection surface.

Preferably, the light-gathering window 2a is made of transparent PMMA resin, and the light-transmitting window 2b is made of transparent PMMA resin. The above two are integrally formed by injection molding, and there is no gap at the joint.

Preferably, the light-gathering window 2a is a ruled-type Fresnel lens, and the side of the light-gathering window 2a close to the light-emitting device 1 is an inclined plane; the side away from the light-emitting device 1 is an inclined plane. The Fresnel surface includes at least one transmission surface and one or more tooth-like total reflection surfaces.

Preferably, the light-transmitting window 2b is made of transparent PMMA resin, which is integrally injection-molded with the light-concentrating window 2a by double injection molding, and there is an air gap between them.

Preferably, the light-gathering window 2a is a revolving Fresnel lens, the light-shielding black frame 4 is arc-shaped, and the transmission surface and the tooth-shaped total reflection surface of the light-gathering window 2a are circular.

Compared with the prior art, the utility model has the following advantages and effects:

The optical sensing device disclosed in the utility model adopts the oblique-axis Fresnel lens, which can achieve the purpose of concentrating light and turning the light path with a relatively thin thickness. The measured points gathered on the skin are reflected by the blood vessels inside the measured points, and then received by the photoelectric receiving tube through the transparent window, thereby generating pulse and blood signals. The optical sensing device has the characteristics of strong signal, low noise, high sensitivity, accuracy, good reliability and the like.

Description of drawings

Fig. 1 is a schematic structural view of an optical sensor device disclosed in the prior art;

Fig. 2 is a schematic diagram of an optical sensing device for a heart rate and blood pressure monitor in the present invention;

Fig. 3 is a cross-sectional view of an optical sensing device for a heart rate and blood pressure monitor disclosed in Embodiment 1;

4A is a front view of the optical lens in the optical sensing device disclosed in Embodiment 1;

4B is an isometric cross-sectional view of the optical lens in the optical sensing device disclosed in Embodiment 1;

4C is a top view of the optical lens in the optical sensing device disclosed in Embodiment 1;

Fig. 4D is a side view of the optical lens in the optical sensing device disclosed in Embodiment 1;

4E is a bottom view of the optical lens in the optical sensing device disclosed in Embodiment 1;

Fig. 5 is a design schematic diagram of an optical sensing device for a heart rate and blood pressure monitor disclosed in Embodiment 1;

Fig. 6 is a schematic diagram of light distribution of an optical sensing device used in a heart rate and blood pressure monitor disclosed in Embodiment 1;

Fig. 7 is a ray tracing diagram of an optical sensing device used in a heart rate and blood pressure monitor disclosed in Embodiment 1;

Fig. 8A is a computer simulation diagram of the distribution shape of light spots on the surface of the photoreceiving tube of an optical sensing device used in a heart rate and blood pressure monitor disclosed in Embodiment 1;

Fig. 8B is a computer simulation diagram of the illuminance data on the surface of the photoelectric receiving tube of the optical sensing device used in the heart rate and blood pressure monitor disclosed in the first embodiment;

9A is a front view of the optical lens in the optical sensing device disclosed in Embodiment 2;

Fig. 9B is an isometric cross-sectional view of the optical lens in the optical sensing device disclosed in Embodiment 2;

9C is a top view of the optical lens in the optical sensing device disclosed in Embodiment 2;

Fig. 9D is a side view of the optical lens in the optical sensing device disclosed in Embodiment 2;

Fig. 9E is a bottom view of the optical lens in the optical sensing device disclosed in Embodiment 2;

Fig. 10 is a three-dimensional model transmission diagram of the optical sensing device disclosed in Embodiment 2;

Fig. 11 is a design schematic diagram of an optical sensing device for a heart rate and blood pressure monitor disclosed in Embodiment 3;

Fig. 12 is a design schematic diagram of an optical sensing device for a heart rate and blood pressure monitor disclosed in Embodiment 4;

Among them, 1-light-emitting device, 2-optical lens, 21-first transmission surface, 22-second transmission surface, 23-first total reflection surface, 24-third transmission surface, 25-second total reflection surface, 2a - Concentrating window, 2b-light-transmitting window, 3-photoelectric receiving tube, 4-shading black frame, 5-housing, 6-PCB printed circuit board.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model more clear and definite, the utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment one

This embodiment discloses an optical sensing device used in a heart rate and blood pressure monitor, and the cross-sectional view of its specific implementation is shown in FIG. 3 . As can be seen from Fig. 3, this optical sensing device is made of light-emitting device 1 (light-emitting device 1 can adopt LED light-emitting diode or laser emitting tube in each embodiment of the utility model), optical lens 2, photoelectric receiving tube 3, light-shielding black frame 4. The casing 5 and the PCB (printed circuit board) 6 are composed. Wherein, the optical lens 2 includes a light-gathering window 2 a and a light-transmitting window 2 b, the light-gathering window 2 a is located above the light emitting device 1 , and the light-transmitting window 2 b is located above the photoelectric receiving tube 3 .

Wherein, the three-dimensional view of the optical lens 2 is shown in FIG. 4 . As shown in Fig. 4A-Fig. 4E, the part near the light-emitting device 1 on the lower right is a ruled, oblique-axis Fresnel lens, which is used as the light-gathering window 2a, which includes a first transmission surface 21, a second transmission surface 22 . The first total reflection surface 23 , the third transmission surface 24 and the second total reflection surface 25 . The part on the left close to the photoreceiving tube 3 is a flat plate structure, which is used as the light-transmitting window 2b. The material of the optical lens 2 is transparent optical plastic, which is transparent PMMA resin or PC resin. The light-shielding black frame 4 is made of black light-absorbing PMMA resin or other plastic materials that can achieve light-tightness, as well as metal materials that can achieve light-proofness and various synthetic materials, and adopts double-material injection molding method and optical lens 2 For one-piece injection molding. The light-shielding black frame can be designed as a straight strip, a circle, an arc or a zigzag, and is designed as a straight strip in this embodiment.

FIG. 5 is a schematic design diagram of an optical sensing device used in a heart rate and blood pressure monitor disclosed in this embodiment. The light emitted from the center O of the light-emitting surface of the light-emitting device 1 passes through the light-gathering window 2a of the optical lens 2, and the light is converged and collimated. On the blood vessels in the skin in between, the light reflected by the blood vessels passes through the light-transmitting window 2b on the left side of the optical lens 2, and is finally received by the photoelectric receiving tube 3. Because the blood in the blood vessel pulsates regularly with the heart rate, its reflected light will also generate pulsed signals. By monitoring the pulsed signal of the reflected light in the blood vessels, the monitoring results of heart rate and blood pressure can be obtained.

In the optical sensing device used for heart rate and blood pressure monitors involved in the utility model, the light-gathering window 2a of the optical lens 2 in the first embodiment is a Fresnel lens with an oblique axis, and its first transmission surface 21 , the light distribution principle of the second transmission surface 22 , the first total reflection surface 23 , the third transmission surface 24 and the second total reflection surface 25 for a single light ray is shown in FIG. 6 . In the figure, OZ is the optical axis passing through the center O of the light-emitting surface of the light-emitting device 1 and perpendicular to the light-emitting surface of the chip. The first transmissive surface 21 is an inclined refracting surface, and its central axis OP forms an angle α with the optical axis OZ, and the angle α is between 15° and 50°, and the inclination angle is preferably 28.29°. The focal point of the first transmissive surface 21 is located at point O in the center of the light-emitting surface of the light-emitting device 1, the light emitted from point O along the direction of OP, the output light QR forms an included angle θ1 with the optical axis OZ, which is called output here. Angle, θ1 is between 30° and 60°, and preferably the outgoing angle θ1 is 45°. Since the point O is the focal point of the first transmission surface 21 of the inclined curved surface, all light rays emitted from the point O and incident on the first transmission surface 21 are parallel to QR and have an exit angle of θ1.

Similarly, the focal point of the first total reflection surface 23 is also located at the center O of the light emitting surface of the light emitting device 1 , and its central axis is also parallel to OP. Any light Oa emitted from the center O of the light-emitting surface of the light-emitting device 1 is incident on the inclined second transmission surface 22, and is reflected by the first total reflection surface 23. The reflected light bS has the distance between the outgoing light ST and the optical axis OZ. The included angle is θ2, θ2=θ1, that is, ST is parallel to QR.

Similarly, the focal point of the second total reflection surface 25 is also located at the center O of the light emitting surface of the light emitting device 1 , and its central axis is also parallel to OP. Any ray Ob emitted from the center O of the light-emitting surface of the light-emitting device 1 is incident on the inclined third transmission surface 24, and is reflected by the second total reflection surface 25. The reflected ray dU has the distance between the outgoing ray UV and the optical axis OZ. The included angle is θ3, θ3=θ1, that is, UV is parallel to QR.

That is, all the rays refracted and reflected by the oblique-axis Fresnel light-gathering window 2 a have an exit angle θ1 = θ2 = θ3 , which is between 30 degrees and 60 degrees. In this specific embodiment, it is preferred that these outgoing angles are all 45 degrees. In actual situation, slight difference between θ1, θ2 and θ3 can be allowed, and the error of 5-10 degrees has little influence on the receiving effect of the photoelectric receiving tube 3 .

The computer simulation and photometric analysis of the optical sensing device used in the heart rate and blood pressure monitor involved in this embodiment are as follows:

In the computer simulation, it is stipulated that the light-emitting device 1 is a green LED with a false luminous flux of 28 Lumen, and its peak wavelength is 518 nm. Fig. 7 is the ray tracing of the optical sensing device (housing 5 is hidden). The small square at the lower right in the figure is a green LED light-emitting diode, the upper part is the light-gathering window 2a of the oblique-axis ruled Fresnel lens, the uppermost position is a virtual blood vessel, and the larger square at the lower left is a photoelectric receiver Tube 3. It can be seen that after the light emitted from the LED passes through the light-gathering window 2a of the oblique-axis Fresnel lens, the light converges and irradiates the upper virtual blood vessel obliquely to the left. After being diffusely reflected by the upper virtual blood vessel, the light is incident on the photoelectric receiving tube 3 through the light-transmitting window 2b on the left side of the lens.

FIG. 8A and FIG. 8B are computer simulation diagrams of the light spot distribution shape and illuminance data on the surface of the photoreceiving tube of an optical sensing device used in a heart rate and blood pressure monitor disclosed in this embodiment.

FIG. 8A shows a spot illuminance distribution graph, and the curves in FIG. 8B are illuminance distribution curves along the horizontal direction on the contour map, and the unit is Lux (lux). If the absorption of the human epidermis is not calculated, and the reflection characteristic of blood vessels is assumed to be diffuse reflection with a reflectance of 100%. It can be seen that the light energy received by the photoelectric receiving tube 3 is very concentrated, reaching 10 to the 5th power Lux, so the detected signal is very strong, even if the current of the LED is greatly weakened, the signal of the blood vessel reflected light can be detected. In addition, due to the design of the light-shielding black frame 4 around the light-gathering window 2a of the inclined Fresnel lens, stray light can be effectively blocked, and stray light can be prevented from directly entering the photoelectric receiving tube 3 through the light guide of the transparent window 2b to generate noise signals. This interferes with the detection results.

Embodiment two

This embodiment discloses an optical sensing device for a heart rate and pressure monitor. The cross-sectional view of the second embodiment is basically similar to that of the first embodiment, as shown in FIG. 3 in the first embodiment. The design principle is also the same, as shown in Figure 5 in the first embodiment. The only difference is that the light-gathering window 2a of the optical lens 2 is an oblique Fresnel lens that rotates around the axis OP. This embodiment 2 discloses an optical sensing device for a heart rate and pressure monitor consisting of a light emitting device 1, an optical lens 2, a photoelectric receiving tube 3, a light-shielding black frame 4, a housing 5, and a PCB (printed circuit board) 6 composition. The optical lens 2 includes a light-gathering window 2a and a light-transmitting window 2b, the three-dimensional views of which are shown in FIGS. 9A-9E. Its three-dimensional model perspective view (housing 5 is hidden) is shown in Figure 10, and the part near the light-emitting device 1 on the lower right is a concentrating window 2a composed of a rotating, oblique-axis Fresnel lens, which is also composed of a transmission surface and two toothed total reflection surfaces. The part near the photoreceiving tube 3 on the lower left is a flat plate, which is used as the light-transmitting window 2b for receiving. The material of the optical lens 2 is transparent optical plastic, which is transparent PMMA resin or PC resin. The light-shielding black frame 4 is an arc-shaped black light-absorbing PC resin, which is integrally injection-molded with the optical lens 2 by double-material injection molding.

Embodiment three

This embodiment discloses an optical sensing device for a heart rate and pressure monitor. The design principle of its specific implementation is shown in FIG. frame 4, housing 5, and PCB (printed circuit board) 6. The optical lens 2 includes a light-gathering window 2a and a light-transmitting window 2b.

It can be seen from the display in Fig. 11 that the light-gathering window 2a is a ruled Fresnel structure lens, and the side of the light-gathering window 2a close to the light-emitting device 1 is an inclined plane; the side away from the light-emitting device 1 is an inclined Fresnel lens. The two surfaces include at least one transmissive surface and one or more toothed total reflection surfaces. The material of the light-gathering window 2a is transparent optical PMMA resin. The function of the light-gathering window 2a is that the Fresnel surface below it first collects and collimates the light emitted by the light-emitting device 1, and the collimated light shoots upward along a direction parallel to the optical axis, and enters the tooth On the tooth-shaped total reflection surface, after being reflected by the tooth-shaped total reflection surface, the light is deflected in one direction, and then passes through the upper light-transmitting window 2b, and is incident on the blood vessel in the measured point of the skin, and the reflected light of the blood vessel passes through again. The light-transmitting window 2b is finally incident on the photoelectric receiving tube 3 for signal processing. Wherein, the material of the light-transmitting window 2b is transparent PMMA, which is integrally injection-molded with the light-gathering window 2a by double injection molding, and there is an air gap between the two, and the air gap can be set in an inclined form.

Embodiment four

This embodiment discloses an optical sensing device for a heart rate and pressure monitor. The design principle of its specific implementation is shown in FIG. frame 4, housing 5, and PCB (printed circuit board) 6. The optical lens 2 includes a light-gathering window 2a and a light-transmitting window 2b.

It can be seen from the display in Fig. 12 that the light-gathering window 2a is a ruled Fresnel structure lens, and the side of the light-gathering window 2a close to the light-emitting device 1 is an inclined plane; the side away from the light-emitting device 1 is an inclined Fresnel lens. The two surfaces include at least one transmissive surface and one or more toothed total reflection surfaces. The material of the light-gathering window 2a is transparent optical PMMA resin. The function of the light-gathering window 2a is that the inclined plane below it close to the light-emitting device 1 first collects the light emitted by the light-emitting device, but it does not play a converging role, and the collected light is obliquely incident on the top of the light-gathering window 2a On the Fresnel surface, after being collimated and deflected by the Fresnel surface, it passes through the light-transmitting window 2b above and is incident on the blood vessels in the measured point of the skin, and the reflected light of the blood vessels passes through the light-transmitting window 2b, finally incident on the photoelectric receiving tube 3 for signal processing.

The material of the light-transmitting window 2b is transparent PMMA resin. The light-concentrating window 2a and the light-transmitting window 2b are integrally injection-molded by double-material injection molding, and there is an air gap between them, which can be set in an inclined form. .

The optical sensing devices for heart rate and blood pressure monitors disclosed in the above embodiments can achieve the purpose of concentrating light and turning light paths with a relatively thin thickness due to the use of oblique-axis Fresnel lenses, which concentrate the LED light Get up and converge to the measured point on the skin in an oblique direction. After being reflected by the blood vessels inside the measured point, it is received by the photoelectric receiving tube through the transparent window, thereby generating pulse and blood signals, achieving strong signal and low noise. Low, high sensitivity, accurate, good reliability and other characteristics of photoelectric sensing effect.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the above-mentioned embodiment, and any other changes, modifications and substitutions made without departing from the spirit and principle of the present utility model , combination, and simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (15)

1. the optical sensing devices for heart rate and blood pressure monitor, it is characterized in that: comprise luminescent device (1), optical lens (2), photoelectric receiving tube (3) and shading black surround (4), wherein, optical lens (2) comprises the optically focused window (2a) being positioned at luminescent device (1) top and the optical transmission window (2b) being positioned at photoelectric receiving tube (3) top; Shading black surround (4) is positioned at luminescent device (1) top, and is arranged between optically focused window (2a) and optical transmission window (2b);

Described optically focused window (2a) is Fresnel structure, and it at least comprises the reflecting surface composition of a transmission plane and one or more dentation.

2. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, it is characterized in that, the optical axis of described optically focused window (2a) is for being obliquely installed.

3. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, it is characterized in that, described optical transmission window (2b) is planar structure.

4. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, is characterized in that, described shading black surround (4) adopts the method for double-shot moulding and described optical lens (2) to make integrated injection molding.

5. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, is characterized in that, described shading black surround (4) adopts the PMMA resin of black light-absorbing.

6. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, is characterized in that, described shading black surround (4) is vertical bar shaped, circle, arc or zigzag.

7. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, it is characterized in that, described luminescent device (1) is LED light emitting diode or LASER Discharge Tube.

8. the optical sensing devices for heart rate and blood pressure monitor according to claim 1, it is characterized in that, transmission plane and the dentation reflecting surface of described optically focused window (2a) are vertical bar shaped.

9., according to the arbitrary described optical sensing devices for heart rate and blood pressure monitor of claim 1 to 8, it is characterized in that,

Described optically focused window (2a) is Fresnel structure lens, comprise the first transmission plane (21), the second transmission plane (22), the first reflecting surface (23), the 3rd transmission plane (24) and the second fully reflecting surface (25)

Wherein the first transmission plane (21) is the refractive curvature tilted, and its central axis OP becomes α angle with the optical axis OZ perpendicular to described luminescent device (1) central point O, described α angle is between 15 degree ~ 50 degree;

The focus of the first transmission plane (21), the first reflecting surface (23), the second reflecting surface (25) all overlaps with described luminescent device (1) central point O simultaneously, and the central axis of the first transmission plane (21), the first reflecting surface (23), the second reflecting surface (25) is parallel to each other.

10. the optical sensing devices for heart rate and blood pressure monitor according to claim 9, it is characterized in that, described α angle is 28.29 degree.

11., according to the arbitrary described optical sensing devices for heart rate and blood pressure monitor of claim 1 to 8, is characterized in that,

Described optically focused window (2a) is Fresnel structure lens, and this optically focused window (2a) is luxuriant and rich with fragrance alunite face near described luminescent device (1) side, comprises at least one transmission plane and more than one dentation fully reflecting surface; It is dentation fully reflecting surface away from described luminescent device (1) side.

12. optical sensing devices for heart rate and blood pressure monitor according to claim 11, is characterized in that:

Described optically focused window (2a) is transparent PMMA resin, and described optical transmission window (2b) is transparent PMMA resin, and the method for the two employing double-material injection-molding above is made integrated injection molding and is shaped.

13., according to the arbitrary described optical sensing devices for heart rate and blood pressure monitor of claim 1 to 8, is characterized in that:

Described optically focused window (2a) is Fresnel structure lens, and this optically focused window (2a) is the plane tilted near described luminescent device (1) side; It is the Fresnel surface tilted away from described luminescent device (1) side, comprises at least one transmission plane and one or more dentation reflecting surface.

14. optical sensing devices for heart rate and blood pressure monitor according to claim 13, is characterized in that:

Described optically focused window (2a) is transparent PMMA resin, and described optical transmission window (2b) is transparent PMMA resin, and the method for the two employing double-material injection-molding above is made integrated injection molding and is shaped, and there is the air gap therebetween.

15., according to the arbitrary described optical sensing devices for heart rate and blood pressure monitor of claim 1 to 7, is characterized in that,

The Fresnel structure lens that described optically focused window (2a) is rotary type, described shading black surround (4) is circular arc, and the transmission plane of described optically focused window (2a) and dentation reflecting surface are circular.