JP2016003884A - Particle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a particle detection device in which a decline in detection sensitivity due to an abnormal electric discharge is suppressed.SOLUTION: A particle detection device comprises: an enclosure having an introduction port and an exhaust port facing the introduction port; a collection cylinder 190 located inside the enclosure and extending from the introduction port side to the exhaust port side; a discharge unit, located inside the enclosure, for causing the particles included in the air introduced from the introduction port into the enclosure to be charged with electricity; a collection unit for causing the particles electrically charged by the charge unit to be adhered to a collection member by an electrostatic force and collecting the adhered particles; and particle detection means for detecting the amount of organism-derived particles that are included in the particles collected by the collection unit. The collection unit includes a conductive frame part 177 surrounding the outer circumference of the collection member and electrically grounded to earth, and having a surface facing the discharge unit. The collection member has a surface facing the discharge unit and has its surface opposite the surface facing the discharge unit electrically grounded to earth.

Description

  The present invention relates to a particle detection device, and more particularly, to a particle detection device that detects biologically derived particles.

  JP-A-2003-337086 (Patent Document 1) is a prior art document that discloses an apparatus for collecting suspended particulate matter in the atmosphere. The airborne particulate matter collection device described in Patent Document 1 is arranged in a collection container, a pump that sucks air into the collection container, and the collection container. A discharge electrode that generates and charges floating particulate matter in the collection container, and a dust collection electrode that draws and collects the suspended particulate matter charged in the collection container by applying a potential difference to the discharge electrode With. This dust collecting electrode is composed of a transparent member having a recess formed on the surface and a transparent electrode film coated on at least the bottom surface of the recess.

JP 2003-337086 A

  In the apparatus for collecting suspended particulate matter in the atmosphere described in Patent Document 1, a dust collecting electrode for collecting suspended particulate matter is formed in the recess of the insulator so that the surface is electrically grounded. The transparent electrode film is included. When a high voltage is applied to the discharge electrode, the surface of the transparent electrode film may be damaged by abnormal discharge. In this case, an error may occur in the detection of the suspended particulate matter collected by the dust collection electrode.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a particle detection apparatus capable of suppressing a reduction in detection sensitivity due to abnormal discharge.

  The particle detector according to the present invention is a particle detector that detects biologically derived particles. The particle detector includes a casing having an inlet and a discharge port facing the inlet, a collection cylinder located inside the casing and extending from the inlet side toward the outlet, A discharge unit for charging particles contained in the air introduced into the housing from the introduction port, and a collection unit for collecting the particles charged by the discharge unit by attaching them to the collection member by electrostatic force And a particle detecting means for detecting the amount of biologically-derived particles contained in the particles collected by the collecting unit. The collection part includes a conductive frame part that surrounds the outer periphery of the collection member and is electrically grounded and has a surface facing the discharge part. The collecting member has a surface facing the discharge portion, and a surface opposite to the surface facing the discharge portion is electrically grounded.

  In one form of this invention, the electrical resistance of an electroconductive frame part is smaller than the electrical resistance of a collection member.

  In one form of this invention, a discharge part contains the acicular electrode in which a front-end | tip part is located inside a collection cylinder. The apex angle of the virtual cone having the tip of the needle-like electrode as the apex and the bottom of the surface facing the discharge portion in the conductive frame is 90 ° or less.

  In one form of this invention, the surface facing the discharge part in a conductive frame part and the surface facing the discharge part in a collection member are located on the same plane.

  In one aspect of the present invention, the particle detecting means is located in the housing and irradiates excitation light toward the particles attached to the collecting member, and is located in the housing and irradiated with the excitation light. A fluorescence detection unit that detects fluorescence emitted from the particles, a heating unit that is positioned so as to be in contact with the collection member and heats the particles attached to the collection member, and fluorescence that is detected from the particles irradiated with the excitation light Calculating means for calculating the amount of biologically-derived particles from the amount whose amount has been changed by heating of the heating unit. The heating unit includes a ground wiring that is grounded. The conductive frame is electrically connected to the ground wiring.

  ADVANTAGE OF THE INVENTION According to this invention, in the particle | grain detection apparatus, the reduction of the detection sensitivity by abnormal discharge can be suppressed.

It is a graph which shows the fluorescence intensity of the particle | grains of biological origin before a heating and after a heating. It is a graph which shows the fluorescence intensity of the dust before a heating and after a heating. It is a schematic diagram for demonstrating a collection process. It is a schematic diagram for demonstrating the fluorescence measurement process before a heating. It is a schematic diagram for demonstrating a heating process. It is a schematic diagram for demonstrating the fluorescence measurement process after a heating. It is a graph which shows the correlation with the increase amount of the fluorescence amount by heating, and the density | concentration of the particle | grains of biological origin. It is a perspective view which shows the external appearance of the particle | grain detection apparatus which concerns on Embodiment 1 of this invention. It is the perspective view which looked at the particle | grain detection apparatus of FIG. 8 from another direction. It is a perspective view which shows the state which removed the fan from the particle | grain detection apparatus of FIG. It is a disassembled perspective view which shows the structure of the particle | grain detection apparatus of FIG. It is a disassembled perspective view which shows the structure of a collection part and a heating part. It is a bottom view which shows the external appearance of a collection part and a heating part. It is a bottom view which shows the connection state of a collection board | substrate and a heater. It is sectional drawing which looked at the collection board | substrate and heater of FIG. 14 from the XV-XV line arrow direction. It is a disassembled perspective view which shows the attachment state of each structure of a particle | grain detection apparatus. It is the figure which looked at the particle | grain detection apparatus of FIG. 16 from the arrow XVII direction. It is a perspective view which shows the state to which the collection part and the moving mechanism were connected. It is sectional drawing which looked at the state where the collection board | substrate is located in the 1st position from the downward direction of the collection board | substrate. It is sectional drawing which looked at the state where the collection board | substrate is located in the 2nd position from the downward direction of the collection board | substrate. It is sectional drawing which looked at the state where the collection board | substrate is located in the 3rd position from the downward direction of the collection board | substrate. It is sectional drawing which looked at the state where a collection board is located in the 4th position from the lower part of a collection board. It is a flowchart which shows the flow of operation | movement of the particle | grain detection apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the collection part of the particle | grain detection apparatus which concerns on Embodiment 1 of this invention. It is the figure which looked at the collection part of FIG. 24 from the arrow XXV direction. It is sectional drawing which shows the state which has arrange | positioned the collection board | substrate to the 1st position which is a collection position. It is a perspective view which shows the external appearance of the electroconductive frame part in the particle | grain detection apparatus which concerns on Embodiment 2 of this invention. In the particle | grain detection apparatus which concerns on Embodiment 2 of this invention, it is sectional drawing which shows the state which has arrange | positioned the collection board | substrate to the 1st position which is a collection position. In the particle | grain detection apparatus which concerns on Embodiment 3 of this invention, it is sectional drawing which shows the state which has arrange | positioned the collection board | substrate to the 1st position which is a collection position. In the particle | grain detection apparatus which concerns on Embodiment 4 of this invention, it is sectional drawing which shows the state which has arrange | positioned the collection board | substrate to the 1st position which is a collection position. In the particle | grain detection apparatus which concerns on Embodiment 5 of this invention, it is sectional drawing which shows the state which has arrange | positioned the collection board | substrate to the 1st position which is a collection position.

  First, a method for detecting biologically derived particles in the particle detection apparatus of the present invention will be described. The biological particles are particles derived from organisms including microorganisms and fungi such as molds and pollen, and do not include dusts such as minerals and refined petroleum products.

  Particles floating in the air are mixed with dusts such as minerals and petroleum refined products and biological particles. In order to measure the amount of biological particles contained in the mixed particles, when the mixed particles are irradiated with ultraviolet light or blue light, the biological particles emit fluorescence. However, the mixed particles include chemical fiber dust that emits fluorescence (hereinafter also referred to as dust) in addition to biologically derived particles. Therefore, the amount of biologically derived particles cannot be measured only by detecting the fluorescence emitted from the mixed particles.

  Therefore, the present inventors utilize the fact that the fluorescence intensity (fluorescence amount) changes when the biological particles are heated, and that the fluorescence intensity does not change even when dust such as chemical fibers is heated. A particle detection method was developed to measure the amount of particles.

  FIG. 1 is a graph showing fluorescence intensity of biological particles before and after heating. FIG. 2 is a graph showing the fluorescence intensity of the dust before and after heating. 1 and 2, the vertical axis represents the fluorescence intensity, and the horizontal axis represents the wavelength of the fluorescent light.

  As shown in FIG. 1, in the biological particles, the amount of fluorescence after heating is remarkably increased in comparison with the amount of fluorescence before heating in a wide wavelength range. On the other hand, as shown in FIG. 2, in the dust, the amount of fluorescence after heating is substantially the same as the amount of fluorescence before heating.

  Therefore, by measuring the amount of fluorescence before heating of the mixed particles and the amount of fluorescence after heating, and obtaining the difference between the amount of fluorescence before heating and the amount of fluorescence after heating, the biological particles contained in the mixed particles The amount of can be calculated.

  Hereinafter, each step of the particle detection method will be described. The particle detection method includes a step of collecting mixed particles, a step of measuring mixed particles before heating, a step of heating mixed particles, a step of measuring mixed particles after heating, and a step of calculating the amount of biological particles. including.

  FIG. 3 is a schematic diagram for explaining the collection process. FIG. 4 is a schematic diagram for explaining the fluorescence measurement process before heating. FIG. 5 is a schematic diagram for explaining the heating step. FIG. 6 is a schematic diagram for explaining the fluorescence measurement process after heating. FIG. 7 is a graph showing the correlation between the amount of increase in fluorescence due to heating and the concentration of biological particles. In FIG. 7, the vertical axis indicates the amount of increase in fluorescence due to heating, and the horizontal axis indicates the concentration of biological particles.

  As shown in FIG. 3, the mixed particles floating in the air are collected on a collection substrate 510 in the collection step. In this step, the collection substrate 510 is disposed to face the needle electrode 530. A DC power source 540 is connected to the collection substrate 510 and the needle electrode 530, and a potential difference is generated between the collection substrate 510 and the needle electrode 530. For example, the positive electrode of the DC power supply 540 is connected to the needle electrode 530, and the negative electrode of the DC power supply 540 is connected to the collection substrate 510.

  By driving the fan 500 positioned below the collection substrate 510, external air is introduced so as to pass through the periphery of the needle electrode 530 toward the collection substrate 510. The mixed particles 600 floating in the air are charged with a positive charge around the needle electrode 530. The collection substrate 510 has a charge opposite to that of the charged mixed particles 600. Therefore, the charged mixed particles 600 are collected by adhering to the surface of the collection substrate 510 by electrostatic force. The mixed particles 600 collected on the collection substrate 510 include biological particles 600A and dust 600B such as chemical fiber dust.

  As shown in FIG. 4, in the fluorescence measurement step before heating, excitation light is irradiated from the light emitting element 550 such as a semiconductor laser toward the mixed particles 600 collected on the collection substrate 510. The fluorescence emitted from the mixed particles 600 irradiated with the excitation light is condensed by the lens 560 and received by the light receiving element 565.

  As shown in FIG. 5, in the heating step, the mixed particles 600 collected on the collection substrate 510 are heated by heating the collection substrate 510 with a heater 520 attached to the lower surface of the collection substrate 510. After heating, the collection substrate 510 is air-cooled.

  As shown in FIG. 6, in the fluorescence measurement step after heating, excitation light is irradiated from the light emitting element 550 toward the mixed particles 600 collected on the collection substrate 510. The fluorescence emitted from the mixed particles 600 irradiated with the excitation light is condensed by the lens 560 and received by the light receiving element 565.

As shown in FIG. 7, based on the relationship between the increase amount ΔF of the fluorescence amount and the biological particle concentration N, the fluorescence measured in the fluorescence measurement step before heating from the fluorescence amount measured in the fluorescence measurement step after heating. From the difference ΔF1 obtained by subtracting the amount, the concentration (particles / m ³ ) of organism-derived particles is calculated. The correlation between the increase amount ΔF and the biological particle concentration N is obtained by conducting an experiment in advance.

  Hereinafter, a particle detection device according to each embodiment of the present invention that detects biologically-derived particles using the above particle detection method will be described. In the drawings referred to in the following embodiments, the same or corresponding members are denoted by the same reference numerals and description thereof will not be repeated. For convenience of explanation, the upper and lower expressions are used, but this is based on the referenced drawings and does not limit the configuration of the invention.

(Embodiment 1)
FIG. 8 is a perspective view showing the appearance of the particle detection apparatus according to Embodiment 1 of the present invention. FIG. 9 is a perspective view of the particle detector of FIG. 8 as seen from another direction. FIG. 10 is a perspective view showing a state where the fan is removed from the particle detection apparatus of FIG. FIG. 11 is an exploded perspective view showing the configuration of the particle detection apparatus of FIG.

  As shown in FIGS. 8 to 11, the particle detection apparatus 100 according to the first embodiment of the present invention includes a housing 110, an exhaust unit, a discharge unit, a collection unit, an irradiation unit 130, and a fluorescence detection unit 160. A heating unit, a calculating means, a moving mechanism, and a cleaning unit.

  The housing 110 includes a lid portion 111 having an introduction port 111a, and a discharge port 112a facing the introduction port 111a, and includes a main body portion 112 that is combined with the lid portion 111 and has a box shape.

  The casing 110 has a substantially rectangular parallelepiped shape, and houses a discharge part, a collection part, an irradiation part, a fluorescence detection part, a heating part, a moving mechanism, and a cleaning part. The main body 112 has an opening on the side opposite to the discharge port 112a. The lid portion 111 has a flat plate shape that closes the opening of the main body portion 112. For example, the housing 110 has a size of 60 mm × 50 mm (length and width of the lid portion 111) × 30 mm (height).

  The collection tube 190 is connected to the lid portion 111 so as to be orthogonal to each other. In the casing 110, the collection tube 190 extends in a cylindrical shape toward the main body 112 so as to be continuous with the introduction port 111a. The collection tube 190 is provided so as to surround a needle electrode 140 described later. The collection tube 190 guides the air containing the mixed particles toward the collection substrate 170 positioned facing the needle electrode 140.

  The fan 120, which is an exhaust unit, exhausts the air in the housing 110 from the exhaust port 112a. The fan 120 can be driven to rotate in the forward direction and the reverse direction. By driving the fan 120 in the forward rotation direction, the air inside the casing 110 is discharged to the outside of the casing 110 through the fan 120. By driving the fan 120 in the reverse direction, air outside the casing 110 is introduced into the casing 110 through the fan 120. The fan 120 is attached to the position of the discharge port 112a of the main body 112.

  The discharge unit is located in the casing 110 and charges the mixed particles contained in the air introduced into the casing 110 from the introduction port 111a by the exhaust of the fan 120. The discharge part has a high-voltage DC power supply 141 as a power supply part and a needle-like electrode 140 as a discharge electrode. The acicular electrode 140 extends from the high-voltage DC power supply 141, penetrates through the collection tube 190, and reaches the inside of the collection tube 190. The tip of the needle electrode 140 is located inside the collection tube 190 and extends in the axial direction of the collection tube 190.

  The positive electrode of the high voltage DC power supply 141 is connected to the needle electrode 140. Note that the negative electrode instead of the positive electrode of the high-voltage DC power supply 141 may be connected to the needle electrode 140. The collection substrate 170 is electrically connected to the high-voltage DC power supply 141 and a heater 180 described later, so that a potential difference is generated between the collection substrate 170 and the needle electrode 140.

  The irradiation unit 130 is located in the housing 110 and irradiates excitation light toward the mixed particles attached to the collection substrate 170. The irradiation unit 130 includes a light emitting element 131 as a light source, an element frame 132, a lens frame 133, a condenser lens 134, and a lens holder 135.

  As the light emitting element 131, a semiconductor laser, an LED (Light Emitting Diode) element, or the like is used. The light emitted from the light emitting element 131 may have a wavelength in either the ultraviolet or visible region as long as it excites biological particles to emit fluorescence.

  The fluorescence detection unit 160 is located in the housing 110 and detects fluorescence emitted from the mixed particles irradiated with excitation light. The fluorescence detection unit 160 includes a noise shield 161, an amplifier circuit 162, a light receiving element 163, a light receiving frame 164, a Fresnel lens 165, and a lens presser 166. As the light receiving element 163, a photodiode or an image sensor is used.

  The moving mechanism moves the collection substrate 170. The moving mechanism includes a motor holder 175, a rotation motor 174 as a rotation drive unit, and a motor presser 173. The rotation motor 174 is connected to the rotation base 172 of the collection unit.

  The cleaning unit removes the mixed particles that have undergone the fluorescence detection from the collection substrate 170. The cleaning unit includes a brush 150, a brush press 151, and a brush fixing unit 152. The brush 150 is sandwiched between a brush press 151 and a brush fixing portion 152 and fixed at one end. The cleaning unit is fixed to the lower surface of the high-voltage DC power supply 141.

  The brush 150 is formed from a fiber assembly. The brush 150 is formed from a fiber assembly having conductivity. The brush 150 is made of, for example, carbon fiber. The fiber aggregate forming the brush 150 preferably has a diameter of φ0.05 mm or more and φ0.2 mm or less. By using the conductive brush 150, the charge of the charged mixed particles can be removed.

  FIG. 12 is an exploded perspective view illustrating the configuration of the collection unit and the heating unit. FIG. 13 is a bottom view showing the external appearance of the collection unit and the heating unit. FIG. 14 is a bottom view showing a connection state between the collection substrate and the heater. 15 is a cross-sectional view of the collection substrate and the heater of FIG. 14 as viewed from the direction of the arrows XV-XV.

  The collection unit has a collection substrate 170 that is a collection member, and collects the charged mixed particles by attaching them to the collection substrate 170 by electrostatic force. In the present embodiment, the collection substrate 170 is a silicon substrate having an electric resistance of 1 MΩ or more and a mirror surface. A conductive transparent film is formed on the surface of the silicon substrate. However, the collection substrate 170 is not limited to a silicon substrate, and may be a glass substrate or a ceramic substrate. A film is not limited to a transparent film, For example, a metal film may be sufficient.

  The collection substrate 170 is fixed on the substrate holder 171. The substrate holder 171 is connected to a rotation base 172 connected to the moving mechanism. An arm portion 176 protrudes from the rotation base 172. The substrate holder 171, the rotation base 172, and the arm portion 176 are integrally formed of a resin material. The collection unit includes a substrate holder 171, a rotation base 172, and an arm unit 176.

  The collection portion further includes a conductive frame portion 177 that surrounds the outer periphery of the collection substrate 170 and is electrically grounded and has a surface facing the needle electrode 140 of the discharge portion. The electrical resistance of the conductive frame portion 177 is smaller than the electrical resistance of the collection substrate 170. The detailed configuration of the conductive frame portion 177 will be described later.

  The collection part has an engagement hole 172a, which is an engaged part engaged with an output shaft 174a of a rotary motor 174, which will be described later, in the rotation base 172. The collection part has the collection board | substrate 170 in the position away from radial direction centering | focusing on the engagement hole 172a.

  As shown in FIGS. 12 and 13, the arm portion 176 extends in the radial direction with the engagement hole 172 a of the rotation base 172 as the rotation center. The arm portion 176 is provided at a position shifted in the circumferential direction from the substrate holder 171 around the axis of the shaft portion 172b. The arm portion 176 has a thin arm tip 176a at the tip.

  The heater 180 serving as a heating unit is positioned so as to contact the collection substrate 170 and heats the mixed particles attached to the collection substrate 170. In the present embodiment, the heater 180 is attached to the lower surface of the collection substrate 170.

  The heater 180 includes a power supply wiring 181 to the heater 180, a temperature sensor signal line 182 built in the heater 180, and a grounded ground wiring 183. The power supply wiring 181, the temperature sensor signal line 182, and the ground wiring 183 are connected to one end of a flexible printed wiring board 184 that is a flat wiring that can follow the rotation of the collection board 170. Note that the potential of the power supply wiring 181 may be higher or lower than the ground potential of the ground wiring 183. Further, an alternating current may be passed through the power supply wiring 181.

  The other end of the flexible printed wiring board 184 is pulled out of the casing 110 and connected to a control unit that receives a signal from the temperature sensor and a DC power source. The surface of the flexible printed wiring board 184 is orthogonal to a plane including the radial direction with the engagement hole 172a as the rotation center.

  With this configuration, when the rotary base 172 rotates as shown by the arrow 10 in FIG. 13, the flexible printed wiring board 184 moves and deforms following the rotation, so that the power supply wiring 181 and the temperature sensor It is possible to suppress the load on each of the signal line 182 and the ground wiring 183.

  As shown in FIGS. 14 and 15, the collection substrate 170 and the heater 180 are bonded by a conductive adhesive 185. In the collection substrate 170, the lower surface 170 b opposite to the upper surface 170 a facing the discharge portion is electrically connected to the ground via the ground wiring 183 of the heater 180 and the conductive adhesive 185 and grounded. Due to the electrostatic force generated by the potential difference between the charged mixed particles and the surface of the collection substrate 170, the mixed particles can be attached to the collection substrate 170 and collected.

  As the conductive adhesive 185, for example, an epoxy resin adhesive manufactured by adding a noble metal powder to a one-pack type epoxy resin adhesive can be used. In the present embodiment, the collection substrate 170 and the ground wiring 183 are electrically connected using the conductive adhesive 185, but may be connected using, for example, solder.

  In the present embodiment, the collection substrate 170 and the ground wiring 183 are connected. For example, an electrode connected to the ground wiring 183 is provided on the upper surface of the heater 180, and the lower surface of the collection substrate 170 is connected to this electrode. 170 b may be electrically connected to the conductive adhesive 185.

  As described above, the number of wirings can be reduced by combining the wiring for generating electrostatic force and the wiring for heating the collecting member. As a result, the wiring around the collection substrate 170 can be easily routed, and the occurrence of mixed wiring and disconnection can be suppressed.

  Hereinafter, the attachment state of each component will be described. FIG. 16 is an exploded perspective view showing an attachment state of each component of the particle detection device. FIG. 17 is a view of the particle detection device of FIG. 16 as viewed from the direction of arrow XVII.

  As shown in FIGS. 16 and 17, the discharge part, the irradiation part 130, the fluorescence detection part 160 and the cleaning part are attached to the lid part 111. In the present embodiment, the moving mechanism is also attached to the lid 111. However, the moving mechanism may be attached to the main body 112. An output shaft 174 a that is an engaging portion that transmits the driving force of the rotary motor 174 protrudes below the rotary motor 174.

  The collecting part is attached to the main body part 112. Since the heater 180 that is a heating unit is attached to the lower surface of the collection substrate 170, the heater 180 is attached to the main body 112 together with the collection unit.

  FIG. 18 is a perspective view illustrating a state in which the collecting unit and the moving mechanism are connected. In FIG. 18, the casing 110 is not shown. By engaging the engagement hole 172a of the rotation base 172 and the output shaft 174a of the rotation motor 174, as shown in FIG. 18, the collection part and the moving mechanism are connected. As the rotation motor 174 is driven, the rotation base 172 rotates (forward rotation, reverse rotation) about the engagement hole 172a.

  Hereinafter, the arrangement of the components of the particle detection device and the position of the collection substrate 170 in plan view will be described.

  FIG. 19 is a cross-sectional view of the state where the collection substrate is located at the first position, as viewed from below the collection substrate. FIG. 20 is a cross-sectional view of the state where the collection substrate is located at the second position, as viewed from below the collection substrate. FIG. 21 is a cross-sectional view of the state where the collection substrate is located at the third position, as viewed from below the collection substrate. FIG. 22 is a cross-sectional view of the state where the collection substrate is located at the fourth position, as viewed from below the collection substrate.

  As shown in FIGS. 19-22, in this embodiment, the discharge part, the fluorescence detection part, and the cleaning part are arrange | positioned along with the circumferential direction centering on the axial part 172b of the rotation base 172. As shown in FIG. Specifically, a fluorescence detection unit, a discharge unit, and a cleaning unit are arranged in order counterclockwise. The irradiation unit 130 is disposed adjacent to the fluorescence detection unit.

  The first position is the position of the collection substrate 170 when the charged particles are attached to the collection substrate 170 while charging the mixed particles by the discharge unit. The second position is the position of the collection substrate 170 when the fluorescence is detected by the fluorescence detection unit while irradiating excitation light to the mixed particles attached to the collection substrate 170 by the irradiation unit 130.

  The third position is the position of the collection substrate 170 when the cleaning unit starts removing the mixed particles on the collection substrate 170. The fourth position is the position of the collection substrate 170 when the removal of the mixed particles on the collection substrate 170 by the cleaning unit is completed. A turning range around the shaft portion 172b from the first position to the fourth position is within about 180 °.

  The collection substrate 170 is rotated by driving the rotation motor 174 to move between the first position and the second position. Further, the collection substrate 170 is rotated by driving the rotation motor 174 and moves between the second position and the third position. Further, the collection substrate 170 is rotated by driving the rotation motor 174 to move between the third position and the fourth position.

  As shown in FIGS. 19 to 22, in the main body 112, the proximity sensor 112 b and the proximity sensor 112 c are arranged on inner walls that are orthogonally adjacent to each other. Each of the proximity sensor 112 b and the proximity sensor 112 c has a pair of terminal portions extending from the inner wall of the main body portion 112 toward the inside of the main body portion 112.

  The collection part is attached to the main body part 112 so that the arm tip part 176a passes between the pair of terminal parts when the shaft part 172b is rotated about the rotation center axis. The proximity sensor 112b and the proximity sensor 112c are sensors that detect the position of the collection substrate 170 by detecting the proximity of the arm tip 176a.

  Hereinafter, the operation of the particle detection apparatus 100 according to the present embodiment will be described. FIG. 23 is a flowchart showing a flow of operations of the particle detection apparatus according to the present embodiment. In the following description, in FIGS. 19 to 22, clockwise rotation around the shaft portion 172b is referred to as normal rotation direction, and counterclockwise rotation is referred to as reverse direction.

  As shown in FIGS. 19 and 23, first, the collection substrate 170 is arranged at the first position which is the collection position. In this state, as a collection step, the fan 120 is driven in the forward rotation direction to introduce air into the housing 110 from the introduction port 111a, and the collection substrate 170 is electrically connected to the high-voltage DC power supply 141 and the heater 180. By connecting, a potential difference is generated between the needle electrode 140 and the collection substrate 170, and the mixed particles floating in the air are charged and attached to the surface of the collection substrate 170 for collection (S101). ).

  In this embodiment, since the acicular needle-like electrode 140 is used as the discharge electrode, the charged mixed particles are irradiated on the upper surface of the collection substrate 170 facing the acicular electrode 140 and irradiated by the irradiation unit 130. It can be attached to a very narrow area corresponding to the area. Thereby, in the fluorescence measurement process of a post process, the fluorescence emitted from the collected mixed particles can be detected efficiently.

  Next, as shown in FIGS. 20 and 23, the rotation motor 174 is driven to rotate the rotation base 172 in the forward rotation direction, and the collection substrate 170 is moved to the second position that is the fluorescence detection position (S102).

  Thereafter, as a fluorescence measurement step of the mixed particles before heating, the irradiation unit 130 irradiates the excitation light toward the mixed particles that are attached to the collection substrate 170 and collected, and the fluorescence detection unit irradiates the excitation light. Fluorescence emitted from the mixed particles is received. Thereby, the amount of fluorescence before heating of the mixed particles collected by being attached to the collection substrate 170 is measured (S103).

  As shown in FIGS. 19 and 23, next, the rotation motor 174 is driven to rotate the rotation base 172 in the reverse direction, and the collection substrate 170 is moved from the second position to the first position (S104).

  Next, as a heating process, the mixed particles collected by being attached to the collection substrate 170 are heated by energizing the heater 180 and heating the collection substrate 170 (S105).

  Thereafter, the energization to the heater 180 is stopped, and the collection substrate 170 is cooled (S106). At this time, by driving the fan 120 in the reverse direction, air may be introduced into the housing 110 from the discharge port 112a to promote cooling of the collection substrate 170.

  As shown in FIGS. 20 and 23, next, the rotation motor 174 is driven to rotate the rotation base 172 in the normal rotation direction, and the collection substrate 170 is moved from the first position to the second position (S107).

  Thereafter, as a fluorescence measurement process of the mixed particles after heating, the irradiation unit 130 irradiates excitation light toward the mixed particles that are attached to the collection substrate 170 and collected, and the fluorescence detection unit irradiates excitation light. Fluorescence emitted from the mixed particles is received. Thereby, the amount of fluorescence after heating of the mixed particles collected by being attached to the collection substrate 170 is measured (S108).

  As shown in FIGS. 21 and 23, as a cleaning process, the rotation motor 174 is driven to rotate the rotation base 172 in the reverse direction, and the collection substrate 170 is moved from the second position to the third position. Further, the collection base 170 is moved from the third position to the fourth position by rotating the rotation base 172 in the reverse direction. While the collection substrate 170 moves from the third position to the fourth position, the upper surface of the collection substrate 170 slides with the tip of the brush 150. Thereby, the mixed particles are removed from the collection substrate 170 (S109).

  During the cleaning process, the fan 120 is driven in the normal direction to discharge the mixed particles removed from the collection substrate 170 to the outside of the housing 110 from the discharge port 112a. At this time, as the collection substrate 170 approaches the third position from the first position, a range in which the collection substrate 170 and the collection cylinder 190 overlap with each other decreases, and thus the opening area of the collection cylinder 190 increases. Thereby, mixed particles can be efficiently discharged to the outside of the casing 110. On the other hand, since the opening area of the collection cylinder 190 is reduced by being shielded by the collection substrate 170 during the collection process, it is possible to reduce air introduction loss.

  In this embodiment, since the cleaning process is performed by moving the collection substrate 170 while the cleaning unit is stationary, there is no need to separately provide a moving mechanism for the cleaning unit. For this reason, size reduction and cost reduction of the particle | grain detection apparatus 100 can be achieved.

  As shown in FIGS. 19 and 23, the rotation motor 174 is driven to rotate the rotation base 172 in the forward rotation direction, and the collection substrate 170 is moved from the fourth position to the first position (S110). By repeating the above steps S101 to S110, it is possible to continuously detect biological particles.

  The detection of biological particles is measured in the fluorescence measurement process before heating and the fluorescence measurement process after heating by a calculation means such as a CPU (Central Processing Unit) connected to the fluorescence detection unit. This is done by calculating the amount of biologically-derived particles contained in the mixed particles from the difference from the fluorescence amount. The calculating means may be attached to the lid portion 111 inside or outside the housing 110, or may be arranged outside the housing 110.

  As described above, the collection substrate 170 is electrically connected to the ground wiring 183 of the heater 180, and an electrostatic force is generated between the charged mixed particles, so that the complicated wiring is not routed. The mixed particles can be attached and collected on the collecting substrate 170.

  As a result, it is possible to prevent the wiring from being mixed or disconnected due to the rotation of the collection substrate 170. Further, by using the flexible printed wiring board 184, the flexible printed wiring board 184 moves and deforms following the rotation of the rotating base 172, so that a load is applied to the wiring connected to the collection unit and the heating unit. Can be suppressed. Thus, the durability of the particle detector 100 can be improved by reducing the load on the wiring.

  In the present embodiment, the collection position (first position), the fluorescence detection position (second position), and the cleaning position (third to fourth positions) are arranged side by side on the circumference, and the collection substrate 170 is By rotating in the forward rotation direction and the reverse rotation direction, these positions are moved. With this configuration, the particle detector 100 can be downsized.

  In the present embodiment, the heating step of heating the mixed particles collected on the collection substrate 170 is the same position (first position) as the collection step of collecting the particles on the collection substrate 170 and collecting them. By implementing in, it can attain size reduction of the particle | grain detection apparatus 100. FIG.

  In this embodiment, the engaging portion of the rotary motor 174 is configured by the output shaft 174a and the engaged portion of the rotating base 172 is configured by the engaging hole 172a. You may comprise the to-be-engaged part of the rotation base 172 with an input shaft.

  The particle detection device 100 according to the present embodiment may be used as a single device for detecting biological particles, or an air purifier, an air conditioner, a humidifier, a dehumidifier, a vacuum cleaner, a refrigerator, a television. It may be incorporated into household appliances such as.

  Hereinafter, a detailed configuration and function of the conductive frame portion 177 of the particle detector 100 according to the present embodiment will be described.

  FIG. 24 is a perspective view showing the appearance of the collection unit of the particle detection device according to the present embodiment. FIG. 25 is a view of the collection part of FIG. 24 as viewed from the direction of the arrow XXV. FIG. 26 is a cross-sectional view illustrating a state in which the collection substrate is disposed at the first position, which is the collection position. In FIG. 25, the flexible printed wiring board 184 is not shown. In FIG. 26, in order to explain the electrical connection of the ground wiring 183, a part of the ground wiring 183 in different cross-sectional views is illustrated.

  As shown in FIGS. 24 to 26, the conductive frame portion 177 of the particle detection device 100 according to the present embodiment surrounds the outer periphery of the collection substrate 170 while being fitted in the substrate holder 171, and the discharge portion Having opposing surfaces.

  Specifically, the conductive frame portion 177 includes an annular upper surface portion 177t facing the needle electrode 140 of the discharge portion, and a peripheral wall portion 177s bent by approximately 90 ° with respect to the upper surface portion 177t. The inner shape of the peripheral wall portion 177 s of the conductive frame portion 177 is formed along the outer shape of the substrate holder 171.

  In the present embodiment, the conductive frame portion 177 is formed by pressing a single metal plate. However, the configuration and the manufacturing method of the conductive frame portion 177 are not limited to this. It may be formed by injection molding a resin having

  As shown in FIGS. 25 and 26, in the present embodiment, the ground wiring 183 is connected to the peripheral wall portion 177s of the conductive frame portion 177. Specifically, as shown in FIG. 25, the ground wiring 183 extends in a straight line so as to be in contact with the peripheral wall portion 177s of the conductive frame portion 177 located on the opposite side to the shaft portion 172b side. As a result, the conductive frame portion 177 is electrically grounded. The ground wiring 183 and the peripheral wall portion 177s of the conductive frame portion 177 are bonded to each other with a conductive adhesive or solder.

  The conductive frame portion 177 does not overlap the collection substrate 170 in plan view. Therefore, by attaching the conductive frame portion 177, the area where the mixed particles can adhere to the upper surface 170a of the collection substrate 170 is not reduced. Further, the conductive frame portion 177 and the collection substrate 170 are not in direct contact.

  As shown in FIG. 26, in the collection process, while introducing air in the direction indicated by the arrow 10, a potential difference is generated between the needle electrode 140 and the collection substrate 170 to float in the air. The mixed particles are charged.

  In this state, the tip of the needle electrode 140 is located above the center of the collection substrate 170. The height from the upper surface portion 177t of the conductive frame portion 177 to the tip portion of the needle electrode 140 is the dimension h, and the shortest distance between the outer peripheral ends of the upper surface portion 177t of the conductive frame portion 177 is the dimension L. The size of the apex angle θ of the virtual cone having the tip of the needle electrode 140 as the apex and the bottom surface of the upper surface portion 177t of the conductive frame portion 177 is 90 ° or less.

  In the particle detection apparatus 100 according to the present embodiment, when a high voltage is applied to the needle electrode 140 and an abnormal discharge occurs, the conductive frame portion 177 induces the abnormal discharge to pass the surge current. As a result, the upper surface 170a of the collection substrate 170 can be prevented from being damaged by abnormal discharge. As a result, in the particle detection apparatus 100 according to the present embodiment, the mirror surface state of the upper surface 170a of the collection substrate 170 can be maintained for a long time, so that reduction in detection sensitivity due to abnormal discharge can be suppressed.

  In the present embodiment, the electrical resistance of the conductive frame portion 177 is smaller than the electrical resistance of the collection substrate 170. In the collection substrate 170, since the lower surface 170b is electrically grounded, the potential of the upper surface 170a is slightly closer to the potential of the needle electrode 140 than the ground potential.

  Therefore, the potential difference between the upper surface portion 177 t of the conductive frame portion 177 and the needle electrode 140 is larger than the potential difference between the upper surface 170 a of the collection substrate 170 and the needle electrode 140. As a result, the location where the abnormal discharge occurs is shifted between the needle electrode 140 and the upper surface portion 177t of the conductive frame portion 177 having a larger potential difference than between the needle electrode 140 and the upper surface 170a of the collection substrate 170. be able to.

  Thereby, since the conductive frame part 177 can induce abnormal discharge to itself more effectively and allow a surge current to pass therethrough, the upper surface 170a of the collection substrate 170 is further prevented from being damaged by the abnormal discharge. Can do.

  As described above, the size of the apex angle θ of the virtual cone with the tip of the needle electrode 140 as the apex and the bottom surface of the upper surface portion 177t of the conductive frame portion 177 is 90 ° or less. A collection substrate 170 is located below the body. As a result, the conductive frame portion 177 can more effectively induce the abnormal discharge to itself and allow the surge current to pass therethrough, thereby further suppressing the upper surface 170a of the collection substrate 170 from being damaged by the abnormal discharge. Can do.

  Hereinafter, the particle | grain detection apparatus which concerns on Embodiment 2 of this invention is demonstrated. In addition, since the particle | grain detection apparatus which concerns on this embodiment differs in the shape of the electroconductive frame part mainly from the particle | grain detection apparatus 100 which concerns on Embodiment 1, description is not repeated about another structure.

(Embodiment 2)
FIG. 27 is a perspective view showing an external appearance of a conductive frame portion in the particle detection apparatus according to Embodiment 2 of the present invention. FIG. 28 is a cross-sectional view showing a state in which the collection substrate is arranged at the first position, which is the collection position, in the particle detection device according to the present embodiment. In FIG. 28, in order to explain the electrical connection of the ground wiring 183, a part of the ground wiring 183 in different cross-sectional views is illustrated.

  As shown in FIGS. 27 and 28, the conductive frame portion 177a of the particle detector according to the present embodiment faces the discharge portion while surrounding the outer periphery of the collection substrate 170 in a state of being fitted into the substrate holder 171a. It has a surface to do.

  Specifically, the conductive frame portion 177a protrudes inward from the annular upper surface portion 177at facing the acicular electrode 140 of the discharge portion, the peripheral wall portion 177as extending downward from the upper surface portion 177at, and the lower end of the peripheral wall portion 177as. Substrate support portion 177ab. The outer shape of the peripheral wall portion 177as of the conductive frame portion 177a is formed along the inner shape of the substrate holder 171a. That is, in this embodiment, the collection board | substrate 170 is fixed on the board | substrate holder 171 in the state accommodated in the electroconductive frame part 177a.

  In the present embodiment, in a state where the collection substrate 170 is accommodated in the conductive frame portion 177a, the upper surface portion 177at of the conductive frame portion 177a and the upper surface 170a of the collection substrate 170 are located on the same plane. ing.

  In the present embodiment, the conductive frame portion 177a is formed by drawing a single metal plate. However, the configuration and manufacturing method of the conductive frame portion 177a are not limited thereto. It may be formed by injection molding a resin having

  As shown in FIG. 28, in the present embodiment, the conductive frame portion 177a is grounded by electrically connecting the substrate support portion 177ab to the ground wiring 183 of the heater 180 via the conductive adhesive 185. Yes.

  The conductive frame portion 177a does not overlap the collection substrate 170 in plan view. Therefore, by attaching the conductive frame portion 177a, the area where the mixed particles can adhere to the upper surface 170a of the collection substrate 170 is not reduced.

  As shown in FIG. 28, in the collection process, while introducing air in the direction indicated by the arrow 10, a potential difference is generated between the needle electrode 140 and the collection substrate 170 to float in the air. The mixed particles are charged.

  In this state, the tip of the needle electrode 140 is located above the center of the collection substrate 170. The height from the upper surface portion 177at of the conductive frame portion 177a to the tip portion of the needle electrode 140 is the dimension h, and the shortest distance between the outer peripheral ends of the upper surface portion 177at of the conductive frame portion 177a is the dimension L. The size of the apex angle θ of the virtual cone having the tip of the needle electrode 140 as the apex and the bottom surface of the upper surface portion 177at of the conductive frame portion 177a is 90 ° or less.

  In the particle detection device according to the present embodiment, when a high voltage is applied to the needle electrode 140 and an abnormal discharge occurs, the conductive frame portion 177a induces the abnormal discharge to cause the surge current to pass therethrough. Thus, the upper surface 170a of the collection substrate 170 can be prevented from being damaged by abnormal discharge. As a result, in the particle detection apparatus according to the present embodiment, since the mirror surface state of the upper surface 170a of the collection substrate 170 can be maintained for a long time, reduction in detection sensitivity due to abnormal discharge can be suppressed.

  In the present embodiment, the electrical resistance of the conductive frame portion 177a is smaller than the electrical resistance of the collection substrate 170. In the collection substrate 170, since the lower surface 170b is electrically grounded, the potential of the upper surface 170a is slightly closer to the potential of the needle electrode 140 than the ground potential.

  Therefore, the potential difference between the upper surface portion 177 at of the conductive frame portion 177 and the needle electrode 140 is larger than the potential difference between the upper surface 170 a of the collection substrate 170 and the needle electrode 140. As a result, the location where the abnormal discharge occurs is shifted between the needle electrode 140 and the upper surface portion 177at of the conductive frame portion 177a, which has a larger potential difference than between the needle electrode 140 and the upper surface 170a of the collection substrate 170. be able to.

  As a result, the conductive frame portion 177a can induce the abnormal discharge to itself more effectively and allow the surge current to pass therethrough, thereby further suppressing the upper surface 170a of the collection substrate 170 from being damaged by the abnormal discharge. Can do.

  As described above, the size of the apex angle θ of the virtual cone having the tip of the needle electrode 140 as the apex and the bottom surface of the upper surface portion 177at of the conductive frame portion 177a is 90 ° or less. A collection substrate 170 is located below the body. As a result, the conductive frame portion 177a can induce the abnormal discharge to itself more effectively and allow the surge current to pass therethrough, thereby further suppressing the upper surface 170a of the collection substrate 170 from being damaged by the abnormal discharge. Can do.

  Further, in the state where the collection substrate 170 is accommodated in the conductive frame portion 177a, the upper surface portion 177at of the conductive frame portion 177a and the upper surface 170a of the collection substrate 170 are located on the same plane, It is easy to remove the mixed particles adhering to the upper surface 170a of the collection substrate 170. Thereby, in the particle | grain detection apparatus which concerns on this embodiment, since the upper surface 170a of the collection board | substrate 170 can be maintained for a long time in a clean state, the reduction of the detection sensitivity accompanying the increase in the frequency | count of a detection can be suppressed.

  Hereinafter, the particle | grain detection apparatus which concerns on Embodiment 3 of this invention is demonstrated. In addition, since the particle | grain detection apparatus which concerns on this embodiment differs from the particle | grain detection apparatus 100 which concerns on Embodiment 1 only in the position of a needle-like electrode, description is not repeated about another structure.

(Embodiment 3)
FIG. 29 is a cross-sectional view showing a state in which the collection substrate is arranged at a first position, which is a collection position, in the particle detection apparatus according to Embodiment 3 of the present invention. In FIG. 29, in order to explain the electrical connection of the ground wiring 183, a part of the ground wiring 183 in different cross-sectional views is illustrated.

  As shown in FIG. 29, in the collection step, while introducing air in the direction indicated by the arrow 10, a potential difference is generated between the needle electrode 140a and the collection substrate 170 to float in the air. The mixed particles are charged.

  In this state, the tip of the needle electrode 140a of the particle detector according to the third embodiment of the present invention is located above the end of the collection substrate 170. The height from the upper surface portion 177t of the conductive frame portion 177 to the tip portion of the needle electrode 140a is the dimension hb. The dimension hb is smaller than the dimension h of the height from the upper surface part 177t of the conductive frame part 177 to the tip part of the needle electrode 140 in the first embodiment.

  As described above, by disposing the tip of the needle-like electrode 140a away from the center of the collection substrate 170 and close to the upper surface 177t of the conductive frame 177, the conductive frame 177 further causes abnormal discharge. Since the surge current can be effectively induced to pass through itself, the upper surface 170a of the collection substrate 170 can be further prevented from being damaged by abnormal discharge as compared with the particle detection device 100 according to the first embodiment. be able to.

  Hereinafter, the particle | grain detection apparatus which concerns on Embodiment 4 of this invention is demonstrated. Note that the particle detection device according to the present embodiment differs from the particle detection device 100 according to the first embodiment only in that the tip of the needle electrode extends in a direction intersecting the axial direction of the collection tube. The description of other configurations will not be repeated.

(Embodiment 4)
FIG. 30 is a cross-sectional view showing a state in which the collection substrate is arranged at the first position, which is the collection position, in the particle detection apparatus according to Embodiment 4 of the present invention. In FIG. 30, in order to explain the electrical connection of the ground wiring 183, a part of the ground wiring 183 in different cross-sectional views is illustrated.

  The needle-like electrode 140b of the particle detector according to the fourth embodiment of the present invention extends from the high-voltage DC power supply 141 and passes through the collection cylinder 190 and reaches the inside of the collection cylinder 190 as shown in FIG. ing. The tip of the needle-like electrode 140b is located inside the collecting cylinder 190 and extends in a direction intersecting with the axial direction of the collecting cylinder 190. That is, the virtual extension line of the tip of the needle electrode 140b and the upper surface 170a of the collection substrate 170 are not orthogonal.

  By disposing the tip of the needle-like electrode 140b in this way, the discharge is dispersed in the extending direction of the tip of the needle-like electrode 140b, and the discharge directed directly below the tip of the needle-like electrode 140b can be reduced. it can. In particular, when the virtual extension line of the tip of the needle electrode 140b and the upper surface 170a of the collection substrate 170 are parallel, the discharge can be most dispersed in the extension direction of the tip of the needle electrode 140b.

  As shown in FIG. 30, in the collection process, while introducing air in the direction indicated by the arrow 10, a potential difference is generated between the needle electrode 140b and the collection substrate 170 to float in the air. The mixed particles are charged.

  In this state, the tip of the needle electrode 140b is located above the center of the collection substrate 170. The height from the upper surface portion 177t of the conductive frame portion 177 to the tip portion of the needle electrode 140b is the dimension h, and the shortest distance between the outer peripheral ends of the upper surface portion 177t of the conductive frame portion 177 is the dimension L. The size of the apex angle θ of the virtual cone having the tip of the needle-like electrode 140b as a vertex and the upper surface portion 177t of the conductive frame portion 177 as the bottom surface is 90 ° or less.

  In the particle detection device according to the present embodiment, when a high voltage is applied to the needle electrode 140b and an abnormal discharge occurs, the conductive frame portion 177 induces the abnormal discharge to pass the surge current. Thus, the upper surface 170a of the collection substrate 170 can be prevented from being damaged by abnormal discharge. As a result, in the particle detection apparatus according to the present embodiment, since the mirror surface state of the upper surface 170a of the collection substrate 170 can be maintained for a long time, reduction in detection sensitivity due to abnormal discharge can be suppressed.

  Further, by disposing the tip of the needle electrode 140b so that the virtual extension line of the tip of the needle electrode 140b and the upper surface 170a of the collection substrate 170 are not orthogonal to each other, the tip of the needle electrode 140b is arranged. The discharge can be dispersed in the extending direction. As a result, since the conductive frame portion 177 can more effectively induce abnormal discharge to itself and allow a surge current to pass therethrough, compared to the particle detector 100 according to the first embodiment, the collection substrate 170 It is possible to further prevent the upper surface 170a from being damaged by abnormal discharge.

  Hereinafter, the particle | grain detection apparatus which concerns on Embodiment 5 of this invention is demonstrated. In addition, since the particle | grain detection apparatus which concerns on this embodiment differs from the particle | grain detection apparatus which concerns on Embodiment 4 only in the position of a needle-like electrode, description is not repeated about another structure.

(Embodiment 5)
FIG. 31 is a cross-sectional view showing a state in which the collection substrate is arranged at the first position, which is the collection position, in the particle detection apparatus according to Embodiment 5 of the present invention. In FIG. 31, in order to explain the electrical connection of the ground wiring 183, a part of the ground wiring 183 in different cross-sectional views is illustrated.

  As shown in FIG. 31, in the collection process, while introducing air in the direction indicated by the arrow 10, a potential difference is generated between the needle electrode 140c and the collection substrate 170 to float in the air. The mixed particles are charged.

  In this state, the tip of the needle electrode 140c of the particle detector according to Embodiment 5 of the present invention is located above the end of the collection substrate 170. The height from the upper surface part 177t of the conductive frame part 177 to the tip part of the needle electrode 140c is the dimension hb. The dimension hb is smaller than the dimension h of the height from the upper surface part 177t of the conductive frame part 177 to the tip part of the needle electrode 140b in the fourth embodiment.

  As described above, by disposing the tip of the needle electrode 140c away from the center of the collection substrate 170 and close to the upper surface 177t of the conductive frame 177, the conductive frame 177 further causes abnormal discharge. Since the surge current can be effectively guided to itself and passed, the upper surface 170a of the collection substrate 170 can be further prevented from being damaged by abnormal discharge as compared with the particle detection device according to the fourth embodiment. Can do.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  140, 140a, 140b, 140c, 530 Needle electrode, 100 particle detector, 110 housing, 111 lid, 111a inlet, 112 body, 112a outlet, 112b, 112c Proximity sensor, 120, 500 fan, 130 irradiation Part, 131, 550 Light emitting element, 132 element frame, 133 lens frame, 134 condenser lens, 135, 166 lens holder, 141 high voltage DC power supply, 150 brush, 151 brush holder, 152 brush fixing part, 160 fluorescence detection part, 161 Noise shield, 162 amplifier circuit, 163,565 light receiving element, 164 light receiving frame, 165 Fresnel lens, 170,510 current collector, 170a upper surface, 170b lower surface, 171, 171a substrate holder, 172 rotating base, 172a Hole, 172b shaft portion, 173 motor holding, 174 rotation motor, 174a output shaft, 175 motor holder, 176 arm portion, 176a arm tip portion, 177, 177a conductive frame portion, 177ab substrate support portion, 177as, 177s peripheral wall portion, 177at, 177t Top surface portion, 180, 520 heater, 181 Power supply wiring, 182 Signal line, 183 Ground wiring, 184 Flexible printed wiring board, 185 Conductive adhesive, 190 Collection tube, 540 DC power supply, 560 Lens, 600 Mixed particles, 600A particles, 600B dust.

Claims (5)

A particle detection device for detecting biological particles,
A housing having an inlet and an outlet facing the inlet;
A collection cylinder located inside the housing and extending from the inlet side toward the outlet side;
A discharge unit that is located in the casing and charges particles contained in the air introduced into the casing from the inlet;
A collection unit for collecting particles charged by the discharge unit by electrostatic force attached to the collection member; and
A particle detecting means for detecting the amount of biological particles contained in the particles collected by the collecting unit;
The collection portion includes a conductive frame portion that surrounds an outer periphery of the collection member and is electrically grounded, and has a surface facing the discharge portion,
The particle detection apparatus, wherein the collection member has a surface facing the discharge portion, and a surface opposite to the surface facing the discharge portion is electrically grounded.   The particle detection apparatus according to claim 1, wherein an electric resistance of the conductive frame portion is smaller than an electric resistance of the collecting member. The discharge part includes a needle-like electrode whose tip is located inside the collection tube,
The magnitude | size of the vertex angle of the virtual cone which makes the front-end | tip part of the said acicular electrode a vertex and makes the surface which faces the said discharge part in the said conductive frame part into a bottom face is 90 degrees or less. The particle | grain detection apparatus as described in.   The surface facing the said discharge part in the said electroconductive frame part and the surface facing the said discharge part in the said collection member are located on the same plane, The any one of Claim 1 to 3 Particle detector. The particle detection means includes
An irradiation unit that is located in the housing and irradiates excitation light toward the particles attached to the collection member;
A fluorescence detection unit that is located within the housing and detects fluorescence emitted from the particles irradiated with the excitation light;
A heating unit that is positioned so as to contact the collecting member and that heats particles adhering to the collecting member;
Calculating means for calculating the amount of biologically derived particles from the amount of fluorescence detected from the particles irradiated with the excitation light changed by the heating of the heating unit;
The heating unit includes grounded ground wiring,
The particle detection device according to claim 1, wherein the conductive frame portion is electrically connected to the ground wiring.

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