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Projection apparatus for projecting at least one image onto a projection surface and method therefor

A projection device and image projection technology, applied in image communication, color TV parts, color TV, etc., can solve the problem of too small luminous flux, and achieve the effect of uniform distribution

Active Publication Date: 2017-08-01
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The result is too little luminous flux

Method used

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  • Projection apparatus for projecting at least one image onto a projection surface and method therefor
  • Projection apparatus for projecting at least one image onto a projection surface and method therefor
  • Projection apparatus for projecting at least one image onto a projection surface and method therefor

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Embodiment Construction

[0061] In order to illustrate the present invention, in figure 1 A strongly simplified embodiment of the current waveform 12 , in particular without amplitude modulation, is shown in . In this case, the absolute value of the current waveform 12 has a constant value and changes sign in each case at the commutation position over the entire shown range of time t, which occurs at times t0, t2, t4, t6, t8, t10 and t12 Transition from negative current to positive current, transition from positive current to negative current occurs at instants t1 , t3 , t5 , t7 , t9 , t11 and t13 .

[0062] The interval t4-t5 is significantly longer than the intervals t0-t1, t1-t2, t2-t3, t3-t4 and is referred to as the time interval tDCLength. The intervals t5-t6, t6-t7, t7-t8, and t8-t9 are approximate in their respective lengths to the intervals t0-t1 to t3-t4. The interval t9 - t10 has a similar length to the interval t4 - t5 , wherein in this DC phase the current now flows in the opposite dire...

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Abstract

The invention relates to a projection apparatus for projecting at least one image onto a projection surface. The projection apparatus includes a discharge lamp and a control apparatus for controlling a discharge current through the lamp. The control apparatus is designed, in a first drive mode, to control the discharge current in accordance with a pre-definable basic current waveform, in a second drive mode, to control the discharge current in accordance with amplitude variance of absolute value of the basic current waveform in a direct current phase without effective reversion and with constant current flow direction, and to change between the first drive mode and the second drive mode in continuous succession. The time when two successive starts of direct current phases differs by a first time interval, and the direct current phase exists in a second time interval. A measurement device determines the measured voltage value of the lamp. An adjustment device determines a first adjustment variable from the difference and adjustment deviation between a target voltage value and the measured voltage value and determines the first time interval and / or the second time interval therefrom. The invention further relates to a method for operating the projection apparatus.

Description

technical field [0001] The invention relates to a projection device for projecting at least one image onto a projection surface according to the preamble of claim 1 . Furthermore, the invention relates to a method for projecting at least one image onto a projection surface according to the preamble of claim 11 . Background technique [0002] The discharge lamps usually used in projection devices for operation with alternating current, such as those commercially available by the applicant under the type P-VIP for use in video projectors, projection Mercury high-pressure discharge lamps used in television equipment and other projection applications. For this purpose, during the first run, a small tip is grown on the electrode head, ie the process of accumulation and migration of tungsten takes place on the arc attachment area. Furthermore, the tip growth is related to the frequency of the lamp current. [0003] The investigations of the inventors here show that when operati...

Claims

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Application Information

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IPC IPC(8): H05B41/288G03B21/20
CPCG03B21/2053H05B41/288H04N9/3114H04N9/3155H04N9/3182
Inventor 米夏埃尔·海泽马克·齐希巴斯蒂安·多布勒
Owner OSRAM GMBH
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