TWM635739U - Curved surface prism applied in infrared sensor devices - Google Patents

Abstract

A curved surface screen applied to an infrared sensing device. The infrared sensing device includes an infrared sensing element capable of detecting a fixed stereoscopic field of view. The curved screen has a non-parallel incident focusing plane and a plurality of outgoing focusing planes , when the incident focusing surface receives an infrared signal from outside the fixed stereo field of view, the infrared signal can be deflected towards the infrared sensing element through the outgoing focusing surface, so that the fixed stereo of the infrared sensing element Field of view is expanded.

Description

Curved surface for infrared sensor devices

This creation is about a curved surface that is applied to an infrared sensing device, especially a curved surface that can expand the fixed stereoscopic field of view of an infrared sensing device.

Generally, pyroelectric infrared sensing element (pyroelectric infrared sensing element, hereinafter referred to as pyro) uses the temperature difference between human body temperature and ambient temperature to pass through a set of optical lenses, and the optical lenses are usually made of high-density polyethylene (HDPE) material (such as lens , 稜鏡 or mirror) to focus the infrared rays emitted by the body temperature in motion in the wavelength range of 5-14 μm, and accurately project the infrared radiation of the body temperature on the internal sensing element to sense the movement of people in the area body temperature.

Because most of the infrared sensing devices will be equipped with optical elements to focus and accurately project the infrared radiation on the sensing elements inside, as known in US Patent Nos. US4,268,752, US6,653,635, and US4,271,360, generally Infrared sensing elements usually have infrared filter windows to filter infrared rays other than 5-14um wavelengths. However, the size of the opening limits the vertical field of view. Therefore, in order to expand the vertical field of view of the infrared sensing device, it is necessary Used with the signal reflector to gather incident rays that are larger than the vertical field of view of the infrared sensing device at different focal points and enter the reflector before projecting on the infrared sensing element; However, such a design often has a complex structure, large size, increased cost due to materials and processing, and lack of assembly. Such problems need to be solved urgently.

Therefore, this case further designed a curved surface that can expand the fixed stereoscopic field of view of the infrared sensing device. The stereoscopic field of view is capable of detecting infrared signals beyond the fixed stereoscopic field of view, so this invention should be an optimal solution.

This creation is applied to the curved surface of the infrared sensing device. The infrared sensing device includes at least one infrared sensing element. The infrared sensing element can detect an infrared signal with a fixed stereoscopic field of view. The infrared sensing element is set on the curved surface Inside, the curved surface includes an incident focus plane; and a plurality of exit focus planes, the exit focus planes face the infrared sensing element; the exit focus plane and the incident focus plane are formed to have a non-uniform thickness The optical focusing structure makes the outgoing focusing plane and the incident focusing plane non-parallel, resulting in the expansion of the fixed stereoscopic field of view of the infrared sensing element. When the incident infrared ray is incident, the incident infrared ray will be guided by the focusing direction of the incident focusing surface, deflected at an angle to form an internal infrared ray entering between the incident focusing surface and the outgoing focusing surface, and the internal infrared ray will be guided to the outgoing The focusing surface is guided by the focusing direction of the outgoing focusing surface, deflects an angle to form an outgoing infrared ray towards the infrared sensing element, and can expand the fixed stereoscopic field of view of the infrared sensing element.

More specifically, the outgoing focusing surface is formed by cutting, and the outgoing focusing surface is an optical surface capable of focusing within a fixed stereoscopic field of view of the infrared sensing element.

More specifically, the fixed stereo viewing range includes a vertical viewing range and a horizontal viewing range.

More specifically, each outgoing focal plane has a first end point and a second end point corresponding to the incident focal plane, and the distance from the first end point to the incident focal plane is greater than the second end The distance from the point to the incident focal plane so that the outgoing focal plane is not parallel to the incident focal plane.

More specifically, the thickness from the first end point to the incident focal plane is less than 1.2 mm.

More specifically, the thickness from the second end point to the incident focal plane is greater than 0.25 mm.

More specifically, the incident focus plane is a curved surface or a plane.

More specifically, the outgoing focusing surface is a curved surface or a plane.

More specifically, the incident infrared rays at the same detection point are all parallel to each other, and the outgoing infrared rays deflected by each outgoing focusing plane are all converged within the vertical field of view of the infrared sensing element to increase the same detection distance the signal gain.

More specifically, the infrared sensing element is a pyroelectric infrared sensing element.

1: Infrared sensor device

11: base

12: Infrared sensing element

121: Normal

13: Circuit board

14: curved surface

141: Incident focal plane

142: Outgoing focus plane

1421: first endpoint

1422: second endpoint

21: Incident infrared rays

22: Internal infrared

23: Outgoing infrared rays

24: emit infrared rays

25: incident infrared

26: incident infrared

A1:Thickness

A2:Thickness

B1: Outgoing focus plane

D: fixed sensing distance

D _X : Expand the sensing distance

X: Fixed sensing area range

X': Expand the range of sensing area

[Picture 1] is a schematic cross-sectional view of the curved surface of this creation applied to the infrared sensor device.

[Fig. 2A] is a schematic diagram of the three-dimensional structure of the curved surface of the curved surface of this creation applied to the infrared sensor device.

[Fig. 2B] is a schematic cross-sectional structure diagram of the curved surface of this creation applied to the curved surface of the infrared sensor device.

[Figure 2C] This is the thickness cut of the curved surface of the curved surface of the infrared sensor device applied to this creation Cutting diagram.

[Figure 3] is a schematic diagram of the application and implementation of this creation applied to the curved surface of the infrared sensor device.

[Figure 4A] is a schematic diagram of the expansion of the vertical field of view after the expansion of the curved surface of this creation applied to the infrared sensor device.

[Figure 4B] is a schematic diagram of the expansion of the horizontal field of view after the expansion of the curved surface of the infrared sensor device applied to this creation.

Other technical contents, features and functions of this creation will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings.

Please refer to Figure 1, which is a schematic cross-sectional view of the curved surface of the infrared sensor device used in this creation. As shown in the figure, the infrared sensor device 1 includes a base 11, one of which is arranged on the base 11 The infrared sensing element 12, a circuit board 13 and a curved surface 14, wherein the infrared sensing element 12 is a pyroelectric infrared sensing element (pyroelectric infrared sensing element).

The circuit board 13 is electrically connected with the infrared sensing element 12 for receiving an infrared signal detected by the infrared sensing element 12 within a fixed stereoscopic field of view.

The curved surface 14, as shown in Figures 2A and 2B, has an incident focal plane 141 facing a detection site (detection object) and a plurality of outgoing focal planes 142, as shown in Figure 2C, the The outgoing focusing surface 142 is formed by cutting the outgoing focusing surface B1 of the raw material, and the outgoing focusing surface 142 is an optical surface capable of focusing within a fixed stereoscopic field of view of the infrared sensing element 12 .

The outer surface of the curved surface 14 can be a single incident focusing surface 141 or an incident focusing surface 141 with multiple curved surfaces/planes.

The curved surface 14 can expand the fixed stereoscopic field of view (solid-angled FOV) of the infrared sensing element 12, and the fixed stereoscopic field of view includes a vertical field of view (vertical field of view) and a horizontal field of view ( horizontal field of view).

If both the incident focus surface 141 and the exit focus surface 142 are curved surfaces, the curvature of the two surfaces can be formed.

If the incident focusing surface 141 is a curved surface and the outgoing focusing surface 142 is a flat surface, the curvature of one surface can be formed.

If the incident focusing surface 141 is a flat surface and the outgoing focusing surface 142 is a curved surface, the curvature of one surface can be formed.

As shown in Fig. 2B, each outgoing focusing plane 142 has a first end point 1421 and a second end point 1422 corresponding to the incident focusing plane 141, and the thickness from the first end point 1421 to the incident focusing plane 141 A1 is greater than the thickness A2 from the second end point 1422 to the incident focus surface 141, so that the exit focus surface 142 is not parallel to the incident focus surface 141, so that an incident infrared ray that enters from the incident focus surface 141 will be subjected to various The outgoing focusing surface 142 is deflected and converged within the fixed stereoscopic field of view of the infrared sensing element 12 .

The focal plane (incident focal plane 141 and outgoing focal plane 142) mentioned in this case refers to the optical surface perpendicular to the normal, and the focal planes all have focal points, which can make the incident rays all concentrate on the focal point on the focal plane .

The outgoing focusing surface 142 and the incident focusing surface 141 corresponding to the outgoing focusing surface 142 form a curved surface similar to a biconvex lens with non-uniform thickness (curved prism), wherein the incident focusing surface 141 and the outgoing focusing surface 142 are not parallel (incident The focus surface 141 and the exit focus surface 142 can be partially parallel, partially non-parallel, or can also be designed to be non-parallel), but these two surfaces can match each other and focus, Therefore, it is a curved surface, and since the outgoing focusing surface 142 is not parallel to the incident focusing surface 141, the infrared rays can be deflected into the infrared beam when performing long-distance or short-distance detection. The infrared sensing element 12 is within a fixed stereoscopic field of view.

The outgoing focusing surface 142 is an optical surface that can focus on the fixed stereoscopic field of view of the infrared sensing element 12, and the thickness between the incident focusing surface 141 and the outgoing focusing surface 142 is too large to attenuate the infrared signal energy. Therefore, as shown in FIG. 2C, in this case, the inner surface of the curved surface 14 will be cut to form a plurality of outgoing focusing surfaces 142 (retaining the curved surface radian of the original outgoing focusing surface B1, And cut the flesh thickness of the outgoing focusing surface B1 of the original 稜鏡 to separate and form a plurality of outgoing focusing surfaces 142), so as to avoid attenuating the infrared signal energy due to excessive thickness.

In order to avoid attenuation of infrared signal energy, the thickness A1 from the first end point 1421 to the incident focusing surface 141 is less than 1.2 mm.

In order to avoid that the thickness is too small to affect the filling and extension of the HDPE segments during injection molding, the thickness A2 from the second end point 1422 to the incident focal plane 141 is greater than 0.25mm.

The actual application of this case is shown in Figure 3, wherein when the incident infrared ray 21 touches the incident focusing surface 141, it will be affected by the focusing direction of the incident focusing surface 141 according to Snell's Law, so that the incident infrared ray 21 The turning angle enters the curved surface 14 (the material medium between the incident focus plane 141 and the exit focus plane 142 ), and its optical path is the internal infrared ray 22 .

After the internal infrared ray 22 touches the outgoing focusing surface 142, it will be affected by the focusing direction of the outgoing focusing surface 142 according to Snell's law, and the internal infrared ray 22 will be deflected at an angle and travel towards the sensing range of the infrared sensing element 12. And the optical path is to emit infrared rays 23 .

From the above, it can be known that by adjusting the arrangement direction of the incident focus surface 141 and the exit focus surface 142, the vertical field of view can be expanded to a maximum of nearly 180 degrees (similarly, it can also be achieved through design Align the direction so that the vertical field of view is less than 180 degrees).

From the above, it can be seen that by adjusting the arrangement direction of the incident focus surface 141 and the exit focus surface 142, the maximum horizontal field of view can be expanded to 360 degrees (similarly, the horizontal field of view can also be made less than 360 degrees by designing the arrangement direction. 360 degrees).

As can be seen from Figure 3, taking five incident infrared rays 21 (labeled only for the outermost side, and other labels are the same, so no additional labeling) is used as an implementation example, the five incident infrared rays 21 are all facing the same detection point and parallel to each other. , and the outgoing infrared rays 23 deflected by each outgoing focusing surface 142 are converged within the vertical field of view of the infrared sensing element 12 to increase the signal gain at the same detection distance.

This case can expand the fixed stereoscopic field of view of the infrared sensing element 12, as shown in Figure 4A, for the expansion of the vertical field of view: (1) assume that a general lens (lens) is used (the general lens is not shown in the figure) The lens is only shown by the effect achieved by a general lens), and is shown by the range that can be sensed on the outermost side, where the incident infrared ray 25 is the boundary that can be sensed on the outermost side. When the incident infrared ray 25 enters and passes through the general lens, it emits infrared rays 24 can move towards the infrared sensing element 12. Due to the characteristics of the general lens, the fixed angle with the normal line 121 of the infrared sensing element as the center and the maximum sensing area range of the general lens is θ; (2) However, if the present case is used The curved surface 稜鏡 14 can be sensed towards the outside, which is also indicated by the range that can be sensed on the outermost side, wherein the incident infrared ray 26 is the boundary that can be sensed on the outermost side, when the incident infrared ray 26 enters the curved surface 稜菡 14 , the outgoing infrared ray 24 can travel toward the infrared sensing element 12; (3) Compared with the general lens, the maximum sensing area range can be increased by using the curved surface 14 of this case. The expansion angle is θ _x , so the infrared sensing element The normal line 121 of 12 is the center, and the angle after the expansion of the maximum sensing area range of the curved surface 14 is θ ' (θ ' = θ+θ _x ), it can be seen that using the curved surface 14, it can The vertical field of view of the fixed stereoscopic field of view of the infrared sensing element 12 is expanded so as to be able to detect areas beyond the fixed stereoscopic field of view.

Continuing from the description in Figure 4A, as shown in Figure 4B, the expansion of the horizontal field of view will be described: (1) Assume that a general lens is used, since the infrared sensing element 12 uses a fixed angle of the maximum sensing area of the general lens is θ, so a fixed sensing area range X can be defined, and in the fixed sensing area range X, the maximum fixed sensing distance is D; (2) If the curved surface 14 of this case is used, since the expanded angle is θ ' (θ ' = θ+θ _x ), through the increase of θ _x , it also increases an expanded sensing distance D _X at the same time, so it can define an expanded sensing area X' when used with the curved surface 稜鏡14 It can be seen that, using the curved surface 14, the horizontal field of view of the fixed stereoscopic field of view of the infrared sensing element 12 can be expanded, so as to be able to detect areas beyond the fixed stereoscopic field of view.

Compared with other conventional technologies, the curved surface of the infrared sensing device provided by this creation has the following advantages:

(1) This case designs an infrared curved surface that can expand the sensing range. When it is applied to an infrared sensing device, the vertical field of view of the infrared sensing element can be expanded by a maximum of nearly 180 degrees through this curved surface. The horizontal field of view of the infrared sensing element can be extended to 360 degrees at most, so it can detect areas beyond the fixed stereoscopic field of view of the infrared sensing element.

(2) In this case, both the incident focusing surface and the outgoing focusing surface can be any curved surface or plane, which is used to expand the stereoscopic field of view, which can deflect the beam and focus the light, which means that the outer surface is used as the focal point. The curvature can be changed by focusing, and the outer surface can be of any shape, so the degree of design freedom is higher.

(3) The focal length of this creative design cannot be too small or too large, and the focal length is determined by the outer surface, so the outer surface of the curved surface is very beneficial for this kind of lens or lens that can detect both distance and near.

This creation has been disclosed above through the above-mentioned embodiments, but it is not intended to limit this creation. Anyone who is familiar with this technical field and has common knowledge can understand the above-mentioned technical characteristics and embodiments of this creation, and in the spirit and spirit of this creation Within the scope, slight changes and modifications are not allowed, so the scope of patent protection of this creation shall be defined by the claims attached to this manual.

1: Infrared sensor device

11: base

12: Infrared sensing element

13: Circuit board

14: curved surface

Claims (10)

A curved surface for infrared sensing device, the infrared sensing device at least includes an infrared sensing element, the infrared sensing element can detect an infrared signal of a fixed stereoscopic field of view, the infrared sensing element is set on the curved surface edge In the mirror, the curved surface includes: an incident focus plane; and a plurality of exit focus planes, the exit focus planes face the infrared sensing element; the exit focus plane and the incident focus plane are formed into a non-uniform thickness The optical focusing structure makes the outgoing focusing plane and the incident focusing plane non-parallel, resulting in the expansion of the fixed stereoscopic field of view of the infrared sensing element. When the incident infrared ray is incident, the incident infrared ray will be guided by the focusing direction of the incident focusing surface, deflected at an angle to form an internal infrared ray entering between the incident focusing surface and the outgoing focusing surface, and the internal infrared ray will be guided to the outgoing The focusing surface is guided by the focusing direction of the outgoing focusing surface, deflecting an angle to form an outgoing infrared ray towards the infrared sensing element, so as to expand the fixed stereoscopic field of view of the infrared sensing element. As described in claim 1, the curved surface for infrared sensing devices, wherein the outgoing focusing surface is formed by cutting, and the outgoing focusing surface is an optical lens that can be focused within the fixed stereoscopic field of view of the infrared sensing element surface. According to claim 1, the curved surface area applied to the infrared sensing device, wherein the fixed three-dimensional field of view includes a vertical field of view and a horizontal field of view. As described in claim 1, the curved surface for infrared sensing devices, wherein each outgoing focal plane has a first end point and a second end point corresponding to the incident focal plane, and the first end point is connected to the The distance of the incident focus plane is greater than the distance from the second end point to the incident focus plane, so that the exit focus plane is not parallel to the incident focus plane. According to claim 4, the curved surface for infrared sensing devices, wherein the thickness from the first end point to the incident focal plane is less than 1.2mm. According to claim 4, the curved surface for infrared sensing device, wherein the thickness from the second end point to the incident focal plane is greater than 0.25 mm. According to claim 1, the curved surface for infrared sensing device, wherein the incident focusing plane is a curved surface or a plane. According to claim 1, the curved surface for infrared sensing device, wherein the outgoing focusing surface is a curved surface or a plane. As described in claim 1, the curved surface of the infrared sensing device is applied, wherein the incident infrared rays at the same detection point are parallel to each other, and the outgoing infrared rays deflected by each outgoing focusing plane are all converged at the vertical direction of the infrared sensing element Within the field of view, it is used to increase the signal gain of the same detection distance. As described in Claim 1, the curved surface coating applied to an infrared sensing device, wherein the infrared sensing element is a pyroelectric infrared sensing element (pyroelectric infrared sensing element).

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