Image intensifiers having means to reduce electromagnetic interference
AssigneeEEV Limited
InventorKevin A. D. Hadfield
Life of this patent
Estimating the term…
Abstract
The high voltage power supply of an image intensifier is operated intermittently to minimize the effect on a resulting intensified image of interference produced by the power supply, the input capacitance of the intensifier maintaining the high voltage at an acceptable level when the power supply is not operating. When used in conjunction with a video camera, the power supply may be allowed to operate only during the frame synch and/or line synch periods. A shutter may inhibit operation of the image intensifier while its power supply is operating.
Claims15
Image intensifier apparatus utilizing a high operating voltage, said apparatus comprising:
- image intensifier means for receiving an input image and producing an intensified output image;
- power supply means coupled to said image intensifier means for producing said high operating voltage;
- means coupled to said power supply means for operating said power supply means in an intermittent manner such that said power supply means is alternately enabled and inhibited, said power supply means being enabled to produce said high operating voltage for a first period of time and being inhibited from producing the high operating voltage for a second period of time, said first period of time being less than aid second period of time;
- and
- means for inhibiting operation of said image intensifier means during said first period of time.
Image intensifier apparatus utilizing a high operating voltage, said apparatus comprising:
- image intensifier means for receiving an input image and producing an intensified output image;
- power supply means coupled to said image intensifier means for producing said high operating voltage;
- means coupled to said power supply means for operating said power supply means in an intermittent manner such that said power supply means is alternately enabled and inhibited, said power supply means being enabled to produce said high operating voltage for a first period of time and being inhibited from producing the high operating voltage for a second period of time, said first period of time being less than said second period of time;
- and
- video camera means for capturing the intensified output image, said video camera means comprising a line blanking period, and said first period of time occurs within said line blanking period.
Dependencies are inferred from the claim text.