Optical smoke detector with optical trap and light guiding and blocking member thereof

Abstract

A smoke detector includes a light source, a diffractive optical assembly, a light sensor, a reflective ramp, and a light trap region. And the light source projects a shaping light beam on the reflective inclined plane through the diffraction optical assembly. And the reflective inclined plane is positioned above the light trap area and is used for reflecting the shaping light beam to the light trap area. A first light blocking wall is arranged between the light source and the light sensor. A second light blocking wall is arranged between the light sensor and the light trap area and is higher than the first light blocking wall.

Description

Technical Field

[0001] The present invention relates to a smoke detector, and more particularly to an optical smoke detector having a light trap region to reduce stray light interference and its light guiding and light blocking members. Background Art

[0002] Optical smoke detectors typically use light emitting diodes as light sources to irradiate smoke particles to generate scattered light. The optical smoke detector also includes a light sensor for measuring the energy of the scattered light to determine the smoke concentration or the type of smoke, and accordingly to decide whether to trigger a fire alarm.

[0003] However, even on a pre-set optical path, not all light rays will scatter with smoke particles. Those light rays that do not scatter with smoke particles will continuously reflect with the inner surface of the chamber of the smoke detector, forming stray light. Although the stray light will eventually disappear due to continuous reflection and energy consumption, some of the stray light may enter the light sensor before the energy is exhausted, forming noise, resulting in the signal value of the measured light energy not being entirely caused by the scattering of smoke particles. This will not only cause signal measurement errors in the smoke sensor, but also lead to an unexpected signal error range caused by the tolerance of the chamber module during actual mass production. Summary of the Invention

[0004] In view of this, a smoke detector capable of reducing stray light interference in the chamber (or detection space) of the smoke detector is indeed needed.

[0005] The present invention provides a light trap structure disposed in the opto-mechanical structure of the smoke detector to capture the light rays that do not scatter with smoke particles, so as to prevent them from being received by the light sensor, thereby reducing stray light interference and reducing false alarms.

[0006] The present invention also provides a smoke detector in which a light source and a light sensor are disposed on the same inner surface of the chamber of the smoke detector, which has the effect of reducing the overall size.

[0007] The present invention provides a smoke detector comprising a light guiding and light blocking member, a light source, and a light sensor. The light guiding and light blocking member includes a first accommodation space, a second accommodation space, a light trap region, a first reflecting inclined surface, and a second reflecting inclined surface. Among them, the first reflecting inclined surface is located above the first accommodation space, the second reflecting inclined surface is located above the light trap region, and the second accommodation space is located between the first accommodation space and the light trap region in a first direction. The light source is disposed in the first accommodation space for projecting a shaped light beam onto the first reflecting inclined surface. The first reflecting inclined surface is used to reflect the shaped light beam towards the second reflecting inclined surface, and the second reflecting inclined surface is used to reflect the reflected shaped light beam from the first reflecting inclined surface to the light trap region. The light sensor is disposed in the second accommodation space for receiving scattered light generated when the reflected shaped light beam irradiates smoke particles.

[0008] The present invention also provides a smoke detector comprising a light guiding and light blocking member, a light source, and a light sensor. The light guiding and light blocking member includes a bearing wall, an accommodation space, a light trap region, and a reflecting inclined surface. Among them, the reflecting inclined surface is located above the light trap region, and the accommodation space is located between the bearing wall and the light trap region in a first direction. The light source is disposed on the bearing wall for projecting a shaped light beam onto the reflecting inclined surface. The reflecting inclined surface is used to reflect the shaped light beam to the light trap region. The light sensor is disposed in the accommodation space for receiving scattered light generated when the shaped light beam irradiates smoke particles.

[0009] The present invention also provides a light guiding and light blocking member of a smoke detector comprising a light trap region, a reflecting inclined surface, an accommodation space, a first light blocking wall, and a second light blocking wall. The reflecting inclined surface is disposed above the light trap region for reflecting a light beam to the light trap region. The accommodation space is used to accommodate a light sensor. The first light blocking wall is disposed on a side of the accommodation space away from the light trap region. The light blocking wall is disposed on a side of the accommodation space close to the light trap region and is between the light trap region and the accommodation space, where the second light blocking wall is higher than the first light blocking wall.

[0010] In order to make the above and other objects, features, and advantages of the present invention more obvious, the following will be described in detail in conjunction with the accompanying drawings. In addition, in the description of the present invention, the same components are denoted by the same reference numerals, which are stated herein in advance. Description of the Drawings

[0011] Figure 1A is a cross-sectional view of the smoke detector according to the first embodiment of the present invention;

[0012] Figure 1B is Figure 1AUpper view along line A-A' in the smoke detector;

[0013] Figure 1C Schematic diagram of the shaping light beam of the reflective inclined plane of the smoke detector according to an embodiment of the present invention;

[0014] Figure 2A Cross-sectional view of the smoke detector according to the second embodiment of the present invention;

[0015] Figure 2B is Figure 2A Upper view along line B-B' in the smoke detector;

[0016] Figure 3A Cross-sectional view of the smoke detector according to the third embodiment of the present invention;

[0017] Figure 3B is Figure 3A Upper view along line C-C' in the smoke detector;

[0018] Figure 4A Cross-sectional view of the smoke detector according to the fourth embodiment of the present invention; and

[0019] Figure 4B is Figure 4A Upper view along line D-D' in the smoke detector.

[0020] Description of reference numerals

[0021] 100, 200, 300, 400 Smoke detectors

[0022] 11, 31 Substrate

[0023] 12, 32 Light source

[0024] 13, 33 Light sensor

[0025] 14, 24, 34, 44 Light guiding and light blocking member

[0026] 140A, 340A First accommodation space

[0027] 140B, 340B Second accommodation space

[0028] 140C, 340C Light trap region

[0029] 141 First reflective inclined plane

[0030] 142, 342 Second reflective inclined plane

[0031] 143, 343 First light blocking wall

[0032] 144, 344, 444 Second light blocking wall

[0033] Light-absorbing members 2401 and 4401

[0034] Protruding member 2422

[0035] Load-bearing wall 341

[0036] Upper cover 80

[0037] Smoke particles 90 Detailed implementation manners

[0038] An object of the present invention is to provide a smoke detector that can reduce the stray light interference formed by the reflected light on the inner surface of the detection space (or cavity) of the smoke detector. In this smoke detector, the illumination range of the light source can be controlled by using a diffractive optical element (DOE) to shape the emitted light beam of the light source, and then the stray light can be absorbed by setting a light trap region to improve the signal-to-noise ratio (SNR) of the detection signal. The detection signal reflects the light energy scattered by the smoke particles 90. It should be noted that the component for controlling the illumination range of the light source is not limited to the diffractive optical element. For example, when the chip of the light source (such as a light-emitting diode) is coated with epoxy resin, the epoxy resin can be configured to control the illumination range of the light source to the desired range. That is, other components can be used to replace the diffractive optical element as long as the component can be used to control the illumination range of the light source.

[0039] Please refer to Figures 1A to 1C as shown Figure 1A is a cross-sectional view of the smoke detector 100 according to the first embodiment of the present invention; Figure 1B is Figure 1A a top view of the smoke detector 100 along line A-A'; Figure 1C is a schematic diagram of the shaped light beam 12LS on the first reflective inclined surface 141 of the smoke detector 100 according to the embodiment of the present invention.

[0040] The opto-mechanical part of the smoke detector 100 includes a substrate 11, a light source 12, a diffractive optical element 121, a light sensor 13, and a light guiding and light blocking member 14, wherein the light source 12, the light sensor 13, and the light guiding and light blocking member 14 are arranged on the substrate 11. In one implementation manner, the light source 12 and the diffractive optical element 121 are pre-formed into a module and no position calibration is required when assembling the smoke detector 100, but the present invention is not limited thereto.

[0041] The smoke detector 100 is formed by combining a base (on which the substrate 11 is disposed) and an upper cover 80 through side walls to form a detection space (or cavity) inside, and the optical mechanism part is disposed in the detection space. The base is used to be disposed at positions such as the ceiling and the wall surface that are conducive to smoke detection. Since the light beam does not transfer from one inner surface of the cavity to another inner surface from emission to reception, the optical mechanism part of the smoke detector 100 according to the embodiment of the present invention can be disposed on the base, the upper cover 80 or the side wall, without specific limitation.

[0042] In one embodiment, when the light emission angle of the light source 12 is controlled within a predetermined range (for example, the area range of the first reflective inclined surface 141), the smoke detector 100 may not include the diffractive optical component 121.

[0043] The substrate 11 is, for example, a printed circuit board (PCB) or a flexible substrate, and is electrically connected to the light source 12 and the optical sensor 13.

[0044] The light guiding and light blocking member 14 is made of, for example, plastic or rubber, and can be integrally formed by injection molding, or formed into a plurality of separate parts and then disposed on the substrate 11 together when assembling the smoke detector 100.

[0045] The light guiding and light blocking member 14 includes a first accommodation space 140A, a second accommodation space 140B, a light trap region 140C, a first reflective inclined surface 141, and a second reflective inclined surface 142. The first reflective inclined surface 141 is located above the first accommodation space 140A, and the second reflective inclined surface 142 is located above the light trap region 140C. Preferably, the first reflective inclined surface 141 and the second reflective inclined surface 142 are polished to facilitate light reflection. The second accommodation space 140B is located between the first accommodation space 140A and the light trap region 140C in a first direction (for example Figure 1A and Figure 1B the left - right direction).

[0046] The light guiding and light blocking member 14 further includes a first light blocking wall 143 disposed on the side of the second accommodation space 140B away from the light trap region 140C (that is, between the first accommodation space 140A and the second accommodation space 140B), for preventing the emitted light of the light source 12 from directly reaching the optical sensor 13. That is, the first accommodation space 140A is disposed on the side of the first light blocking wall 143 away from the second accommodation space 140B.

[0047] The light guiding and light blocking member 14 further includes a second light blocking wall 144 disposed on the side of the second accommodation space 140B close to the light trap region 140C (that is, between the second accommodation space 140B and the light trap region 140C), for preventing the stray light in the light trap region 140C from reaching the optical sensor 13. In one embodiment, the second light blocking wall 144 is higher than the first light blocking wall 143, but is not limited thereto.

[0048] In one embodiment, the upper edge 141UE of the first reflective inclined surface 141 extends above the first light-blocking wall 143 in the first direction (more specifically, the direction towards the light sensor 13), but the present invention is not limited thereto. In an embodiment where the diffractive optical component 121 is used to limit the emission beam of the light source 12, as long as the first reflective inclined surface 141 covers the range of the emission beam of the light source 12, the upper edge 141UE of the first reflective inclined surface 141 is not necessarily required to extend above the first light-blocking wall 143.

[0049] In one embodiment, the upper edge 142UE of the second reflective inclined surface 142 does not extend above the second light-blocking wall 144 in the first direction (more specifically, the direction towards the light sensor 13), but the present invention is not limited thereto. According to the angle at which the first reflective inclined surface 141 reflects the emission beam of the light source 12, the upper edge 142UE of the second reflective inclined surface 142 may also extend above the second light-blocking wall 144.

[0050] The light source 12 is, for example, a vertical cavity surface emitting laser (VCSEL), a light emitting diode, or a laser diode. The light source 12 and the diffractive optical component 121 are disposed in the first accommodation space 140A, and the light source 12 is used to project (e.g., upward) a shaped beam onto the first reflective inclined surface 141 through the diffractive optical component 121. In one embodiment, the diffractive optical component 121 is used to shape the emission beam of the light source 12 into a linear beam 12LS (e.g., Figure 1C displayed on the first reflective inclined surface 141), an elliptical beam, or a circular beam, but is not limited to these shapes as long as the range of the shaped beam does not exceed the range of the first reflective inclined surface 141. The linear beam 12LS is better than a point beam and can increase the illumination range.

[0051] It should be noted that although Figure 1A the light source 12 is shown to emit light vertically (relative to the surface of the substrate 11), the present invention is not limited thereto. In other embodiments, the light source 12 may emit the shaped beam obliquely.

[0052] The first reflective inclined surface 141 is used to reflect the shaped beam towards the second reflective inclined surface 142, and the second reflective inclined surface 142 is used to reflect the reflected shaped beam from the first reflective inclined surface 141 to the light trap region 140C. According to the inclination angle of the first reflective inclined surface 141, the first reflective inclined surface 141 may reflect the shaped beam horizontally, with an elevation angle, or a depression angle relative to the surface of the substrate 11. Since the second reflective inclined surface 142 is used to reflect the reflected shaped beam towards the bottom surface of the light trap region 140C and the second reflective inclined surface 142 is located above the light trap region 140C, stray light escaping from the light trap region 140C and being transmitted to the light sensor 13 can be reduced.

[0053] The optical sensor 13 includes, for example, a complementary metal oxide semiconductor (CMOS) image sensor or a single photon avalanche diode (SPAD) image sensor. The optical sensor 13 is disposed in the second accommodation space 140B and is configured to receive the scattered light generated when the reflected shaped light beam irradiates the smoke particles 90 in the cavity. It can be understood that the distribution of the smoke particles 90 in the detection space of the smoke detector 100 (for example, the space below the upper cover 80) is not limited to the content shown in the drawings of this case.

[0054] Please refer to Figure 2A and Figure 2B shown in Figure 2A is a cross-sectional view of the smoke detector 200 according to the second embodiment of the present invention; Figure 2B is Figure 2A a top view of the smoke detector 200 along the line B - B' in Figure 2A and Figure 2B The components identical to those in Figure 1A and Figure 1B are labeled with the same reference numerals.

[0055] The difference between the smoke detector 200 of the second embodiment and the smoke detector 100 of the first embodiment is that an absorbent member 2401 is further disposed on the bottom surface of the light trap region 140C of the light guiding and light blocking member 24 to absorb the reflected light of the second reflecting inclined surface 142. The absorbent member 2401 is, for example, a black light-absorbing cardboard, a black light-absorbing flannelette, a black matte light-absorbing polyvinyl chloride (PVC) plate, etc., and there is no specific limitation as long as it can effectively absorb the reflected light from the second reflecting inclined surface 142. In addition, the smoke detector 200 may further provide an extension portion 2422 on the second light blocking wall 144 extending perpendicularly or obliquely towards the second reflecting inclined surface 142 to reduce the stray light in the light trap region 140C from escaping from the light trap region 140C. Except for the additional configuration of the absorbent member 2401 and / or the extension portion 2422, the other components of the smoke detector 200 are the same as those of the smoke detector 100, so they will not be described in detail here.

[0056] Please refer to Figure 3A and Figure 3B shown in Figure 3A is a cross-sectional view of the smoke detector 300 according to the third embodiment of the present invention; Figure 3B is Figure 3A a top view of the smoke detector 300 along the line C - C' in

[0057] The optical-mechanical part of the smoke detector 300 includes a substrate 31, a light source 32, a diffractive optical component 321, a light sensor 33, and a light guiding and light blocking member 34. Among them, the light sensor 33 and the light guiding and light blocking member 34 are arranged on the substrate 31. In one embodiment, the light source 32 and the diffractive optical component 321 are pre-formed on the same module, and no position calibration is required during the assembly of the smoke detector 300, but this is not limited thereto.

[0058] The smoke detector 300 is also formed by combining a base and an upper cover 80 through side walls to form a detection space inside, and the optical-mechanical part is arranged in the detection space. The optical-mechanical part of the smoke detector 300 in the embodiment of the present invention can also be arranged on the base, the upper cover 80 or the side wall, without specific limitation.

[0059] In one embodiment, when the light emission angle of the light source 32 is controlled within a predetermined range (for example, the area range of the reflective inclined surface 342), the smoke detector 300 may not include the diffractive optical component 321.

[0060] The substrate 31 is selected from a printed circuit board or a flexible substrate, and is electrically connected to the light source 32 and the light sensor 33.

[0061] The light guiding and light blocking member 34 is made of, for example, plastic or rubber, and can be integrally formed by injection molding, or formed into multiple separate parts and then arranged on the substrate 31 together during the assembly of the smoke detector 300.

[0062] The light guiding and light blocking member 34 includes a first accommodation space 340A, a second accommodation space 340B, a light trap region 340C, a bearing wall 341, and a reflective inclined surface 342. The bearing wall 341 is located on one side of the first accommodation space 340A (for example Figure 3A and Figure 3B the left side), the reflective inclined surface 342 is located above the light trap region 340C, and the second accommodation space 340B is located between the first accommodation space 340A and the light trap region 340C in a first direction (for example Figure 3A and Figure 3B the left-right direction). The first accommodation space 340A is located between the bearing wall 341 and the second accommodation space 340B in the first direction.

[0063] The light guiding and light blocking member 34 further includes a first light blocking wall 343 arranged on the side of the second accommodation space 340B away from the light trap region 340C (that is, between the bearing wall 341 and the second accommodation space 340B), for preventing the emitted light of the light source 32 from directly reaching the light sensor 33. The first accommodation space 340A is arranged on the side of the first light blocking wall 343 away from the second accommodation space 340B.

[0064] The light guiding and light blocking member 34 further includes a second light blocking wall 344 disposed on a side of the second accommodation space 340B close to the light trap region 340C (i.e., between the second accommodation space 340B and the light trap region 340C) for preventing stray light in the light trap region 340C from being transmitted to the light sensor 33. In one embodiment, the second light blocking wall 344 is higher than the first light blocking wall 343, but is not limited thereto.

[0065] In one embodiment, the upper edge 342UE of the reflective inclined surface 342 does not extend above the second light blocking wall 344 in the first direction (more specifically, the direction toward the light sensor 33), but the present invention is not limited thereto. According to the angle of the emission beam of the light source 32, the upper edge 342UE of the reflective inclined surface 342 may also extend above the second light blocking wall 344. The reflective inclined surface 342 is preferably polished to enhance the light reflection ability.

[0066] The light source 32 is, for example, a vertical cavity surface emitting laser, a light emitting diode, or a laser diode. The light source 32 and the diffractive optical component 321 are disposed on the carrier wall 341. The light source 32 is used to project a shaped beam onto the reflective inclined surface 342 through the diffractive optical component 321, wherein the reflective inclined surface 342 is used to reflect the shaped beam to the light trap region 340C. The light source 32 can project the shaped beam onto the reflective inclined surface 342 horizontally, with an elevation angle, or with a depression angle relative to the surface of the substrate 31. In one embodiment, the diffractive optical component 321 is used to shape the emission beam of the light source 32 into a linear beam (e.g., 12LS shown in Figure 1C displayed), an elliptical beam, or a circular beam, but is not limited to these shapes as long as the range of the shaped beam does not exceed the range of the reflective inclined surface 342. Preferably, the length direction of the linear beam is parallel to Figure 3B the up and down direction. The light source 32 is disposed on the carrier wall 341 at a height higher than the heights of the first light blocking wall 343 and the second light blocking wall 344. The carrier wall 341 is disposed on a side of the first light blocking wall 343 away from the second accommodation space 340B for carrying the light source 32, and its height is higher than that of the second light blocking wall 344.

[0067] Since the reflective inclined surface 342 is used to reflect the shaped beam toward the bottom surface of the light trap region 340C and the reflective inclined surface 342 is located above the light trap region 340C, stray light escaping from the light trap region 340C and being transmitted to the light sensor 33 can be reduced.

[0068] The optical sensor 33 includes, for example, a CMOS image sensor or a SPAD image sensor. The optical sensor 33 is disposed within the second accommodation space 340B and is configured to receive scattered light generated when the shaped light beam irradiates the smoke particles 90 within the cavity. It can be understood that the distribution of the smoke particles 90 within the detection space of the smoke detector 300 (such as the space below the upper cover 80) is not limited to that shown in the drawings of this case.

[0069] In one embodiment, in order for the processors of the smoke detectors 100 - 400 of the present invention, such as a microcontroller unit (MCU), an application specific integrated circuit (ASIC), or a field programmable gate array (FPGA), to distinguish different types of smoke, the light sources 12, 32 are configured to emit light of a first wavelength (such as red light, but not limited thereto) and light of a second wavelength (such as blue light, but not limited thereto). Among them, the chip emitting the light of the first wavelength and the chip emitting the light of the second wavelength can be different or the same chips, and different light wavelengths can be achieved by controlling driving parameters or configuring filters. The optical sensors 13, 33 have a first detection area and a second detection area respectively configured to detect the light of the first wavelength and the light of the second wavelength. In one embodiment, the first detection area and the second detection area can be located in the same pixel array, but different filter layers are configured thereon to detect different light wavelengths.

[0070] Please refer to Figure 4A and Figure 4B shown in Figure 4A is a cross-sectional view of the smoke detector 400 according to the fourth embodiment of the present invention; Figure 4B is Figure 4A a top view of the smoke detector 400 along the line D - D' in Figure 4A and Figure 4B The same components as those in Figure 3A and Figure 3B are labeled with the same reference numerals.

[0071] The difference between the smoke detector 400 of the fourth embodiment and the smoke detector 300 of the third embodiment is that an absorbing member 4401 is further disposed on the bottom surface of the light trap region 340C of the light guiding and light blocking member 44 to absorb the reflected light of the reflecting inclined surface 342. The absorbing member 4401 is also, for example, black light-absorbing cardboard, black light-absorbing flannel, black matte light-absorbing polyvinyl chloride board, etc., without specific limitation. In addition, the upper half of the second light blocking wall 444 of the smoke detector 400 can be arranged to extend obliquely towards the reflecting inclined surface 342 such that the upper half of the second light blocking wall 444 in the first direction is wider than the lower half, so as to prevent stray light within the light trap region 340C from escaping from the light trap region 340C. Except for additionally configuring the absorbing member 4401 and / or changing the shape of the second light blocking wall 444, the other components of the smoke detector 400 are the same as those of the smoke detector 300, and thus will not be described in detail herein.

[0072] In another embodiment, Figure 4B the second light-blocking wall 444 can be configured to have an extension portion 2422 as shown in Figure 2A , or Figure 2A the second light-blocking wall 144 can be configured to have the shape of the second light-blocking wall 444 as shown in Figure 4A . That is, Figure 2A and Figure 4A the shapes of the second light-blocking walls can be combined.

[0073] It should be noted that although Figures 3A - 3B and Figures 4A - 4B in the embodiments of

[0074] it is shown that the light guiding and light blocking members 34 and 44 still include the first accommodating space 340A, the present invention is not limited thereto. Since the light source 32 and the diffractive optical component 321 are disposed on the carrier wall 341 and not within the first accommodating space 340A, in other embodiments, the first light-blocking wall 343 can be directly connected to the carrier wall 341 without providing the first accommodating space 340A.

[0075] It should be noted that although in the above embodiments it is shown that the light absorbing member is only disposed on the bottom surface of the light trap region, the present invention is not limited thereto. In other embodiments, the light absorbing member can also be disposed on the vertical surface of the light trap region to enhance the light absorption effect.

[0076] In summary, in the existing optical smoke detector, the light that does not scatter with the smoke particles will continuously reflect with the inner surface of the cavity in the smoke detector, forming stray light and thus noise. Therefore, the present invention further provides an optical smoke detector (refer to Figures 1A - 4B ) and its light guiding and light blocking members that can reduce the interference of stray light. It uses a diffractive optical component to control the projection of the emitted light beam to a predetermined position, and sets a light trap region to absorb the light energy of the light that does not scatter with the smoke particles, so as to prevent the stray light from being transmitted to the light sensor to form noise interference, improve the signal-to-noise ratio, and reduce false alarms.

[0077] Although the present invention has been disclosed by the foregoing examples, it is not intended to limit the present invention. Any person having ordinary knowledge and skills in the technical field to which the present invention pertains may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the appended claims.

Claims

1. A smoke detector, the smoke detector comprising: Light guiding and light blocking member, the light guiding and light blocking member includes a first accommodating space, a second accommodating space, a light trap region, a first reflecting inclined surface, and a second reflecting inclined surface, wherein, The first reflective inclined surface is located above the first accommodating space, the second reflective inclined surface is located above the light trap region, and the second accommodating space is located between the first accommodating space and the light trap region in a first direction; A light source configured in the first accommodating space for projecting a shaped light beam onto the first reflective inclined surface, wherein the first reflective inclined surface is configured to reflect the shaped light beam towards the second reflective inclined surface, and the second reflective inclined surface is configured to reflect the reflected shaped light beam from the first reflective inclined surface into the light trap region; And A light sensor configured in the second accommodating space for receiving scattered light generated when the reflected shaped light beam irradiates smoke particles.

2. The smoke detector according to claim 1 further includes a substrate, wherein, The light source, the light sensor, and the light guiding and light blocking member are configured on the substrate.

3. The smoke detector according to claim 1, further comprising: A diffractive optical component for shaping the emitted light beam of the light source into a linear light beam, an elliptical light beam, or a circular light beam as the shaped light beam.

4. The smoke detector according to claim 1, wherein, The light guiding and light blocking member further comprises: A first light blocking wall configured between the first accommodating space and the second accommodating space; and A second light blocking wall configured between the second accommodating space and the light trap region, wherein the second light blocking wall is higher than the first light blocking wall.

5. The smoke detector according to claim 4, wherein, The upper edge of the first reflective inclined surface extends above the first light blocking wall in the first direction.

6. The smoke detector according to claim 4, wherein The upper edge of the second reflective inclined surface does not extend above the second light blocking wall in the first direction.

7. The smoke detector according to claim 1, wherein An absorbent member is further disposed on the bottom surface of the light trap region, and the absorbent member is configured to absorb the reflected light of the second reflective inclined surface.

8. The smoke detector according to claim 1, wherein, The light source is configured to emit light of a first wavelength and light of a second wavelength, and The light sensor has a first detection region and a second detection region, and the first detection region and the second detection region are respectively configured to detect the light of the first wavelength and the light of the second wavelength.

9. A smoke detector, the smoke detector comprising: Light guiding and light blocking member, the light guiding and light blocking member includes a bearing wall, a receiving space, a light trap region, and a reflective inclined surface, wherein, The reflective inclined surface is located above the light trap region, and the accommodating space is located between the bearing wall and the light trap region in a first direction; A light source configured on the bearing wall for projecting a shaped light beam onto the reflective inclined surface, wherein the reflective inclined surface is configured to reflect the shaped light beam into the light trap region; And A light sensor configured in the accommodating space for receiving scattered light generated when the shaped light beam irradiates smoke particles.

10. The smoke detector according to claim 9 further includes a substrate, wherein, The light sensor and the light guiding and light blocking member are configured on the substrate.

11. The smoke detector according to claim 9, further comprising: A diffractive optical component for shaping the emitted light beam of the light source into a linear light beam, an elliptical light beam, or a circular light beam as the shaped light beam.

12. The smoke detector according to claim 9, wherein, The light guiding and light blocking member further comprises: A first light blocking wall configured between the bearing wall and the accommodating space; and A second light blocking wall configured between the accommodating space and the light trap region, wherein the second light blocking wall is higher than the first light blocking wall.

13. The smoke detector according to claim 12, wherein, The upper edge of the reflective inclined surface does not extend above the second light-blocking wall in the first direction.

14. The smoke detector according to claim 12, wherein, The light source is disposed at a height on the bearing wall that is higher than the heights of the first light-blocking wall and the second light-blocking wall.

15. The smoke detector according to claim 9, wherein, An absorbent member is further disposed on the bottom surface of the light trap region, and the absorbent member is used to absorb the reflected light of the reflective inclined surface.

16. The smoke detector according to claim 9, wherein, the light source is used to emit light of a first wavelength and light of a second wavelength, and the light sensor has a first detection region and a second detection region, and the first detection region and the second detection region are respectively used to detect the light of the first wavelength and the light of the second wavelength.

17. A light guiding and light blocking member for a smoke detector, the light guiding and light blocking member comprising: a light trap region; a reflective inclined surface, which is disposed above the light trap region and is used to reflect a light beam to the light trap region; a receiving space, which is used to receive a light sensor; a first light-blocking wall, which is disposed on a side of the receiving space away from the light trap region; and a second light-blocking wall, which is disposed on a side of the receiving space close to the light trap region and is between the light trap region and the receiving space, wherein the second light-blocking wall is higher than the first light-blocking wall.

18. The light guiding and light blocking member according to claim 17, further comprising: another receiving space, which is disposed on a side of the first light-blocking wall away from the receiving space and is used to receive a light source; and another reflective inclined surface, which is disposed above the another receiving space and is used to reflect the emitted light beam of the light source to the reflective inclined surface.

19. The light guiding and light blocking member according to claim 17, further comprising: A load-bearing wall, configured on a side of the first light-blocking wall away from the accommodating space, for bearing a light source, wherein, the bearing wall is higher than the second light-blocking wall.

20. The light guide and light blocking member according to claim 17, wherein, An absorbent member is further disposed on the bottom surface of the light trap region, and the absorbent member is used to absorb the light beam reflected by the reflective inclined surface.

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