# US 2008/0185001 A1 · Head-up display unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0185001 A1 - Document ID: US20080185001A1 - Status: Published application - Kind: A1 - Application number: 11/962,694 - Filed: 2007-12-21 - Published: 2008-08-07 - Earliest claimed: 2007-01-31 - Assignees: Draeger Safety UK Limited - Inventors: Robin McWilliams - Web page: https://patentgrep.com/patent/US20080185001A1 ## CPC - G02B 27/017: {Head mounted} - B63C 11/12: Diving masks - A62B 18/08: Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices (eye-pieces for protective goggles A61F9/02; composition of materials for the windows or other transparent parts A62D7/00) - B63C 2011/121: {comprising integrated optical signalling means or displays for data or images} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B63C: LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS (floating nets, floating slipways, or the like for recovering aircraft from the water B63B35/52) - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) ## Abstract A head-up display unit 10 comprises a microprocessor 30 which controls four light-emitting diodes (LEDs) which constitute the head-up display 20. The microprocessor 30 and LEDs 20 are powered by a battery 40 and a switch 50 is in series with the battery. A temporary store 60 in the form of a capacitor is in parallel with the battery 40 after the switch 50. A data receiver 32 is connected to the microprocessor 30 and communicates received data 34 to the microprocessor 30. The head-up display unit 10 is located in the face-mask 100 of a self contained breathing apparatus unit. The LEDs 20 are located in the periphery of the viewable region of the face-mask 100 so that they can be seen by the user when the face-mask is worn. The switch 50 comprises two conductive rubber strips which conduct current between them when sufficient pressure is applied. The switch 50 is located on a portion of the face-mask seal 102 such that when the face-mask 100 is worn i.e. held against the face of the wearer, the rubber strips conduct current between them and when the face-mask is not being worn the rubber strips do not conduct. The switch 50 is embedded in the face-mask seal 102 in such a way that a tight seal between the user and the face-mask 100 is still achieved when the face-mask is worn. ## Claims ### Claim 1 A face-mask of a breathing apparatus comprising: a face mask unit; a switch located on a portion of the face mask unit arranged such that when the unit is donned by a user the switch closes causing power from a power-supply to be supplied to the unit, and when the unit is removed the switch is opened causing the power-supply to be disconnected from the unit; and, a temporary power storage device which is charged when the switch is closed and which powers the unit when the switch is opened. ### Claim 2 (depends on 1) A face mask according to claim 1, wherein the switch is arranged to be closed by pressure when the unit is donned by the user. ### Claim 3 (depends on 1) A face mask according to claim 1 wherein the temporary power storage device comprises a capacitor. ### Claim 4 (depends on 1) A face mask according to claim 1 including a display element for indicating one or more conditions relating to data. ### Claim 5 (depends on 1) A face mask according to claim 1 including an electronic processor means for processing data. ### Claim 6 (depends on 1) A face mask according to claim 1, wherein the switch comprises conductive rubber strips which conduct current between them when sufficient pressure is applied to at least one strip. ### Claim 7 (depends on 4) A face mark according to claim 4, wherein the display element includes at least one LED. ### Claim 8 (depends on 4) A face mask according to claim 4, wherein the display element comprises an LCD display. ### Claim 9 (depends on 1) A face mask according to claim 1, wherein the power-supply is a battery located within the unit. ### Claim 10 (depends on 1) A face mask according to claim 1, further including a receiver for wirelessly receiving data and transmitting it to a processor. ### Claim 11 (depends on 10) A face mask according to claim 10, wherein the receiver is an inductive receiver. ### Claim 12 (depends on 4) A face mask according to claim 4, wherein the data displayed by the display element relates to the pressure in a cylinder of pressurised gas.