# US 10,310,483 B2 · Method and apparatus for protecting heat dissipation fan of projecting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,483 B2 - Document ID: US10310483B2 - Status: Granted - Kind: B2 - Application number: 15/325,089 - Filed: 2014-10-21 - Published: 2017-09-14 - Granted: 2019-06-04 - Earliest claimed: 2014-07-10 - Assignees: Zte Corporation - Applicants: Zte Corporation - Inventors: Wei Yan - Web page: https://patentgrep.com/patent/US10310483B2 ## CPC - G05B 19/406: characterised by monitoring or safety (G05B19/19 takes precedence) - F04D 27/001: {Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring} - F04D 27/008: {Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves} - G03B 21/00: Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) - G03B 21/14: Details - G03B 21/16: Cooling; Preventing overheating - H04N 9/3144: {Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16)} - H04N 9/3173: {wherein the projection device is specially adapted for enhanced portability} - G05B 2219/34465: Safety, control of correct operation, abnormal states - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Disclosed is a method for protecting a heat dissipation fan of a projecting device, including: when a heat dissipation fan is in a working state, obtaining fall-related information when a projecting device is falling; determining fall-related information of the heat dissipation fan according to the fall-related information of the projecting device; terminating the operation of the heat dissipation fan when the fall state information of the heat dissipation fan is in a falling state; resuming the operation of the heat dissipation fan when the fall state information of the heat dissipation fan is that the fall ends. Further disclosed is an apparatus for protecting a heat dissipation fan of a projecting device, corresponding to the method. ## Claims ### Claim 1 A method for protecting a heat dissipation fan of a projecting device, comprising: when the projecting device is in a working state, obtaining time information and acceleration information in real time via a two-axis or three-axis acceleration sensor when the projecting device is falling; when the acceleration of the projecting device obtained through the acceleration sensor reaches a first threshold and that the duration reaches 200 milliseconds is determined according to the time information, determining that fall state information is a falling state, wherein the first threshold is a product of any selected value with an absolute value less than 0.2 and a gravitational acceleration; or when the acceleration of the projecting device obtained through the acceleration sensor is within a second threshold range and that the duration reaches any selected value between 1 and 2 seconds is determined according to the time information, determining that the fall state information is a falling static state, wherein the second threshold is an interval value between products of the gravitational acceleration and 0.8 and 1.2 respectively; when the fall state information of the heat dissipation fan is in the falling state and the heat dissipation fan is in a working state, terminating an operation of the heat dissipation fan; when the fall state information is in the falling static state and the projecting unit is projecting, turning on the heat dissipation fan. ### Claim 2 (depends on 1) The method of claim 1, wherein, before real-time obtaining the fall-related information when the projecting device is falling, the method further comprises obtaining working states of the projecting unit and the heat dissipation fan. ### Claim 3 (depends on 1) A computer program, comprising program instructions which, when executed by a projecting device, enable the projecting device to execute the method of claim 1. ### Claim 4 (depends on 3) A non-transitory computer readable storage medium, carrying the computer program of claim 3. ### Claim 5 An apparatus for protecting a heat dissipation fan of a projecting device, comprising: an obtaining unit and a processing unit; wherein, the obtaining unit consists of a two-axis or three-axis acceleration sensor, and is arranged to, when the projecting device is in a working state, real-time obtain time information and acceleration information when the projecting device is falling; the processing unit is arranged to determine fall state information of the heat dissipation fan according to the fall-related information of the projecting device; wherein, the processing unit comprises: a fall state information analyzing module and a processing module; wherein, the fall state information analyzing module is arranged to, determine that the fall state information is a falling state when the acceleration of the projecting device obtained through the acceleration sensor reaches a first threshold and that a duration reaches 200 milliseconds is determined according to the time information; determine that the fall state information is a falling static state when the gravitational acceleration of the projecting device obtained through the acceleration sensor is within a second threshold range and that the duration reaches any selected value between 1 and 2 seconds is determined according to the time information; wherein the first threshold is a product of any selected value with an absolute value less than 0.2 and a gravitational acceleration; the second threshold is an interval value between the products of the gravitational acceleration and 0.8 and 1.2 respectively; the processing module is arranged to: terminate an operation of the heat dissipation fan when the fall state information is the falling state and the heat dissipation fan is in the working state; or turn on the heat dissipation fan when the fall state information is the falling static state and the projecting unit is projecting. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein, the apparatus further comprises a working state sensing unit of a projecting unit and a heat dissipation fan, arranged to obtain working states of the projecting unit and the heat dissipation fan.