# US 9,439,274 B2 · Discharge lamp driving device, projector, and discharge lamp driving method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,274 B2 - Document ID: US9439274B2 - Status: Granted - Kind: B2 - Application number: 14/795,386 - Filed: 2015-07-09 - Published: 2016-03-03 - Granted: 2016-09-06 - Earliest claimed: 2014-09-01 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Yoichi Nakagomi; Tetsuo Terashima - Web page: https://patentgrep.com/patent/US9439274B2 ## CPC - H05B 41/3927: {by pulse width modulation (H05B41/3922 takes precedence)} - G03B 21/2026: {Gas discharge type light sources, e.g. arcs} - G03B 21/2053: {Intensity control of illuminating light (controlled by video signal processing H04N5/74 or H04N9/31)} - H04N 9/312: {Driving therefor (driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08)} - H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406)} - H04N 9/3197: {using light modulating optical valves} - H05B 41/2928: {for protecting the lamp against abnormal operating conditions} - Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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 - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A discharge lamp driving device according to an aspect includes: a discharge lamp driving section configured to supply driving power to a discharge lamp including electrodes and a control section configured to control the discharge lamp driving section. The control section is configured to perform a steady lighting driving for supplying first driving power to the discharge lamp and a high power driving for supplying second driving power larger than the first driving power to the discharge lamp. The magnitude of heat load on the electrodes by the high power driving changes on the basis of the first driving power. ## Claims ### Claim 1 A discharge lamp driving device comprising: a discharge lamp driving section configured to supply driving power to a discharge lamp including electrodes; and a control section configured to control the discharge lamp driving section, wherein the control section is configured to perform a steady lighting driving for supplying first driving power to the discharge lamp and a high power driving for supplying second driving power larger than the first driving power to the discharge lamp, and magnitude of heat load on the electrodes by the high power driving changes on the basis of the first driving power. ### Claim 2 (depends on 1) The discharge lamp driving device according to claim 1, wherein the magnitude of the heat load is set to be smaller as the first driving power is smaller. ### Claim 3 (depends on 1) The discharge lamp driving device according to claim 1, wherein the magnitude of the heat load changes on the basis of the first driving power in previous steady lighting driving. ### Claim 4 (depends on 1) The discharge lamp driving device according to claim 1, wherein the magnitude of the heat load is adjusted according to a value of the second driving power in the high power driving. ### Claim 5 (depends on 1) The discharge lamp driving device according to claim 1, wherein the magnitude of the heat load is adjusted according to a waveform of a driving current supplied to the discharge lamp in the high power driving. ### Claim 6 (depends on 1) The discharge lamp driving device according to claim 1, wherein the control section controls the discharge lamp driving section to perform the high power driving in a launching period from a start of lighting of the discharge lamp to a shift to a steady lighting period when the steady lighting driving is performed. ### Claim 7 (depends on 1) The discharge lamp driving device according to claim 1, wherein the control section controls the discharge-lamp driving section to perform the high power driving in a steady lighting period when the steady lighting driving is performed. ### Claim 8 (depends on 1) The discharge lamp driving device according to claim 1, wherein the control section performs the high power driving when the set first driving power is lower than rated power of the discharge lamp. ### Claim 9 (depends on 1) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 1; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 10 (depends on 2) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 2; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 11 (depends on 3) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 3; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 12 (depends on 4) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 4; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 13 (depends on 5) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 5; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 14 (depends on 6) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 6; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 15 (depends on 7) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 7; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 16 (depends on 8) A projector comprising: the discharge lamp configured to emit light; the discharge lamp driving device according to claim 8; a light modulating device configured to modulate, according to a video signal, light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating device. ### Claim 17 A discharge lamp driving method for supplying driving power to a discharge lamp including electrodes and driving the discharge lamp, the discharge lamp driving method comprising: performing a steady lighting driving for supplying first driving power to the discharge lamp; and performing a high power driving for supplying second driving power larger than the first driving power to the discharge lamp, wherein magnitude of heat load on the electrodes by the high power driving changes on the basis of the first driving power.