# US 11,122,667 B2 · Floodlight > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,667 B2 - Document ID: US11122667B2 - Status: Granted - Kind: B2 - Application number: 16/628,229 - Filed: 2018-07-10 - Published: 2021-05-13 - Granted: 2021-09-14 - Earliest claimed: 2017-07-18 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Kazunori Tsuge; Koji Takahashi; Kosuke Komiya - Web page: https://patentgrep.com/patent/US11122667B2 ## CPC - H05B 45/56: involving measures to prevent abnormal temperature of the LEDs - F21S 9/02: the power supply being a battery or accumulator - F21V 23/005: {the substrate is supporting also the light source} - F21V 29/61: characterised by control arrangements - F21V 29/677: {the fans being used for discharging} - H05B 47/10: Controlling the light source - H05B 47/165: following a pre-assigned programmed sequence; Logic control [LC] - F21W 2131/1005: {of working places, building sites or the like} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS ## Abstract A floodlight includes a light source, a support member that supports the light source, and a fan that cools the light source by generating an air flow on a surface of the support member. The light source is supported on a front face of the support member and emits light forward with respect to the support member. The fan is disposed rearward of the support member, at a position facing the support member. ## Claims ### Claim 1 A floodlight comprising: a housing having an internal space; a wall that partitions the internal space into a first internal space and a second internal space, and has an opening that connects the first internal space and the second internal space; one or more first vents that connect the first internal space to an external space; a second vent that connects the second internal space to the external space; a support member in the first internal space; a plurality of fins that protrude rearward from the support member, the fins each having a plate-like shape extending in a first direction on a predetermined plane that is in parallel with a rear face of the support member, the fins being arranged in a second direction on the predetermined plane that perpendicularly intersects with the first direction; a light source in the first internal space and supported by a front face of the support member, the light source emitting light forward with respect to the support member; and a fan in the second internal space and that cools the light source by generating an air flow on a surface of the support member, the fan being disposed rearward of the support member, at a position facing the support member via the opening. ### Claim 2 (depends on 1) The floodlight according to claim 1, wherein the support member includes a control board that has a driving circuit for driving the light source and supports the light source, and a heat-radiating member that is in contact with the control board, and the fan generates an air flow on a surface of the heat-radiating member. ### Claim 3 (depends on 2) The floodlight according to claim 2, wherein the light source is disposed on a front face of the control board, the heat-radiating member is disposed rearward of the control board, in a manner to be in contact with the control board, and the fan is disposed at a position facing the heat-radiating member. ### Claim 4 (depends on 3) The floodlight according to claim 3, wherein the heat-radiating member includes a support panel that is in contact with the control board, the fins are supported on a rear face of the support panel and protrudes rearward from the support panel, each of the fins has a through hole that penetrates in the second direction, and the first vents are provided on one side and on another side of the fins in the first direction, and are provided on one side and on another side of the fins in the second direction. ### Claim 5 (depends on 1) The floodlight according to claim 1, further comprising: a temperature sensor that detects a temperature of the support member; and a fan control unit that controls driving of the fan based on a detection signal from the temperature sensor. ### Claim 6 (depends on 5) The floodlight according to claim 5, wherein the fan control unit drives the fan when the temperature of the support member is equal to or higher than a temperature threshold, and stops the fan when the temperature of the support member is lower than the temperature threshold. ### Claim 7 (depends on 1) The floodlight according to claim 1, further comprising: an operation device that is operated to adjust a light emission state of the light source; a light emission state control unit that controls the light emission state based on an amount by which the operation device is operated; and a fan control unit that controls driving of the fan based on the amount by which the operation device is operated. ### Claim 8 (depends on 1) The floodlight according to claim 1, further comprising a battery mounting unit on which an electric-tool battery is mounted, wherein the light source and the fan are driven by power supplied from the electric-tool battery. ### Claim 9 (depends on 1) The floodlight according to claim 1, wherein at least a part of the support member is exposed via the one or more first vents, the one or more first vents are provided on a first side face of the housing, and the second vent is provided on a second side face of the housing. ### Claim 10 A floodlight comprising: a support member; a light source that is supported on a front face of the support member and emits light forward with respect to the support member; a fan that cools the light source by generating an air flow on a surface of the support member, the fan being disposed rearward of the support member, at a position facing the support member; a main-body member that includes a housing supporting the light source and the support member; an arm that is coupled to a coupling mechanism provided to a side face of the main-body member and is pivotable about a rotational axis; and an operation device that is disposed in the coupling mechanism, and is operated to adjusts a light emission state of the light source, the coupling mechanism including a first coupling mechanism that is provided to a first side face of the main-body member, and a second coupling mechanism that is provided to a second side face of the main-body member, the operation device being disposed in the first coupling mechanism. ### Claim 11 (depends on 10) The floodlight according to claim 10, wherein the second coupling mechanism includes a fastening mechanism that fastens the arm to the main-body member. ### Claim 12 (depends on 11) The floodlight according to claim 11, wherein the fastening mechanism includes a cam that restricts a pivoting movement of the arm. ### Claim 13 (depends on 10) The floodlight according to claim 10, wherein the operation device includes a switch that has at least a part thereof disposed along the rotational axis and is displaceable in a direction parallel with the rotational axis, and a dial that is disposed around the switch and is rotatable about the rotational axis. ### Claim 14 (depends on 13) The floodlight according to claim 13, further comprising a light emission state control unit that controls the light emission state based on an amount by which the operation device is operated, wherein the amount by which the operation device is operated includes an amount by which the switch is displaced, and an amount by which the dial is rotated. ### Claim 15 (depends on 14) The floodlight according to claim 14, further comprising a displacement sensor that detects the amount by which the switch is displaced, wherein the light emission state control unit includes a first light emission state control unit that controls the light emission state based on a detection signal from the displacement sensor. ### Claim 16 (depends on 15) The floodlight according to claim 15, wherein control of the light emission state, which is performed by the first light emission state control unit, includes at least one of control for causing the light source to switch between an on state, a blinking state, and an off state, and control for switching a color of light emitted from the light source. ### Claim 17 (depends on 14) The floodlight according to claim 14, further comprising a rotation sensor that detects the amount by which the dial is rotated, wherein the light emission state control unit includes a second light emission state control unit that controls the light emission state based on a detection signal from the rotation sensor. ### Claim 18 (depends on 17) The floodlight according to claim 17, wherein control of the light emission state, which is performed by the second light emission state control unit, includes control of illuminance on a predetermined illuminance reference surface irradiated with light emitted from the light source. ### Claim 19 (depends on 18) The floodlight according to claim 18, further comprising a storage unit that stores therein the illuminance controlled by the second light emission state control unit, wherein the second light emission state control unit controls, when the light source having been off is to be turned on, the light source in such a manner that light is emitted at an illuminance stored in the storage unit when the light source is off. ### Claim 20 (depends on 14) The floodlight according to claim 14, further comprising a battery mounting unit that is provided to the main-body member and on which a battery is mounted, wherein the light emission state control unit controls the light emission state based on remaining charge in the battery that is mounted on the battery mounting unit. ### Claim 21 A floodlight comprising: a heat-radiating member; a light emitter unit including a light source and a control board that supports the light source, the light source being supported on a front face of the heat-radiating member and emits light forward with respect to the heat-radiating member; a fan that cools the light source by generating an air flow on a surface of the support member, the fan being disposed rearward of the heat-radiating member, at a position facing the heat-radiating member; a housing that has an internal space in which the light emitter unit, the heat-radiating member, and the fan are housed, the housing including vents that connect an internal space to an external space of the housing, at least a part of the heat-radiating member being exposed via the vents, the vents including a first vent on a first side face of the housing, and a second vent on a second side face of the housing; and a plurality of fins on the heat-radiating member, the heat-radiating member being in contact with the control board, the fins each having a plate-like shape extending in a first direction on a predetermined plane that is in parallel with a rear face of the heat-radiating, the fins being arranged in a second direction on the predetermined plane that intersects perpendicularly with the first direction. ### Claim 22 (depends on 21) The floodlight according to claim 21, wherein the first side face is a top face of the housing, and the second side face is a bottom face of the housing. ### Claim 23 (depends on 22) The floodlight according to claim 22, wherein the housing includes a third side face and a fourth side face, the third side face is a left face of the housing, the fourth side face is a right face of the housing, the vents includes a third vent provided on the third side face, and a fourth vent provided on the fourth side face, and the heat-radiating member is exposed via the first vent, the second vent, the third vent, and the fourth vent. ### Claim 24 (depends on 23) The floodlight according to claim 23, wherein the heat-radiating member includes a support panel that supports the control board, the fins protrude from the support panel, and the fins each have a through hole. ### Claim 25 (depends on 24) The floodlight according to claim 24, wherein the fins each have a plate-like shape extending in an up-and-down direction, and are provided with a space therebetween in a left-and-right direction, the though holes penetrate through the fins in the left-and-right direction, the first vent is provided on an upper side of the fins, the second vent is provided on a lower side of the fins, the third vent is provided on a left side of the fins, and the fourth vent is provided on a right side of the fins. ### Claim 26 (depends on 25) The floodlight according to claim 25, wherein the internal space of the housing is partitioned by a wall into a first internal space in which the light emitter unit and the heat-radiating member are housed, and a second internal space in which the fan is housed, the wall has an opening that connects the first internal space and the second internal space, and the fan faces the heat-radiating member via the opening.