Night vision device and method
First Claim
1. A night vision device (NVD) comprising:
- an image intensifier tube;
a source of electrical power for said image intensifier tube;
a switch circuit which in a first position of said NVD relative to the earth allows electrical power supply to said image intensifier tube, in a second position of said NVD relative to the earth said switch circuit causing electrical power supply to said image intensifier tube to be discontinued;
whereby in said second position of the night vision device, said image intensifier tube is turned off;
wherein said switch circuit includes an acceleration-responsive switch sensing movement of said NVD between the first and second positions;
in which said acceleration-responsive switch senses accelerations applied to the night vision device;
wherein said switch circuit further includes a time delay circuit portion delaying the turning off of said image intensifier tube for a certain interval after each of;
the sensing by said acceleration-responsive switch of movement of the NVD to said second position, and after the application of a sufficient acceleration to the NVD affecting said acceleration-responsive switch.
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0 Petitions
Accused Products
Abstract
A night vision device (NVD) includes a control circuit having an acceleration-responsive switch. When the NVD is in a generally horizontal use position, the acceleration-responsive switch enables a circuit allowing voltage to be applied to an image intensifier tube of the night vision device, so that night vision is provided. On the other hand, when the device is flipped up to a stowed position allowing the user of the device unobstructed natural vision, the acceleration-responsive switch senses the changed orientation of the gravitational acceleration vector, and turns off the image intensifier tube as well as other light-emitting sources of the night vision device. The acceleration responsive switch controls operation of voltage step-up circuit, which allows the NVD to be operated with a single one and on-half volt battery cell, and which also insures when it is turned off that not only is the image intensifier tube turned off, but also that all other possible sources of light emissions from the NVD are turned off.
38 Citations
14 Claims
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1. A night vision device (NVD) comprising:
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an image intensifier tube; a source of electrical power for said image intensifier tube; a switch circuit which in a first position of said NVD relative to the earth allows electrical power supply to said image intensifier tube, in a second position of said NVD relative to the earth said switch circuit causing electrical power supply to said image intensifier tube to be discontinued; whereby in said second position of the night vision device, said image intensifier tube is turned off; wherein said switch circuit includes an acceleration-responsive switch sensing movement of said NVD between the first and second positions;
in which said acceleration-responsive switch senses accelerations applied to the night vision device;wherein said switch circuit further includes a time delay circuit portion delaying the turning off of said image intensifier tube for a certain interval after each of;
the sensing by said acceleration-responsive switch of movement of the NVD to said second position, and after the application of a sufficient acceleration to the NVD affecting said acceleration-responsive switch. - View Dependent Claims (2, 3)
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4. A night vision device (NVD) comprising:
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an image intensifier tube, said image intensifier tube being capable of providing a visible image in response to receipt of light; a single battery cell providing battery voltage for providing the sole source of electrical power to the image intensifier tube; a low-voltage voltage step-up circuit receiving battery power at battery voltage and responsively providing as an output an intermediate voltage which is above battery voltage, said low-voltage voltage step-up circuit further having a shutdown terminal to which supply of a signal causes said circuit to discontinue supply of said intermediate voltage as an output and to provide substantially zero voltage as an output; a high-voltage voltage step-up circuit receiving said intermediate voltage and responsively providing high voltage levels to the image intensifier tube to provide said visible image; and a switch circuit in response to a pre-determined criteria connecting a signal to said shutdown terminal; whereby, occurrence of said pre-determined criteria causes said low-voltage voltage step-up circuit to shut down, causing said high-voltage voltage step-up circuit to cease providing said high voltage levels to said image intensifier tube, and causing said image intensifier tube to cease providing said image. - View Dependent Claims (5, 6)
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7. A method of operating a NVD having an image intensifier tube, said method comprising steps of:
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providing a source of electrical power for said image intensifier tube; and providing a switch circuit within said NVD which in a first position of said NVD relative to the earth allows electrical power supply to said image intensifier tube, and which in a second position of said NVD relative to the earth causes electrical power supply to said image intensifier tube to be discontinued; wherein said step of providing said switch circuit includes the step of using an acceleration-responsive switch to sense movement of said NVD between the first and second positions; further including the step of using said acceleration-responsive switch to also sense accelerations applied to the night vision device; further including the steps of including a time delay circuit in association with said switch circuit, and utilizing said time delay circuit to delay the turning off of said image intensifier tube for a certain interval after movement of the NVD from said first to said second position. - View Dependent Claims (8, 9)
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10. A method of providing night vision, said method comprising steps of:
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providing an image intensifier tube; using a single battery cell to provide battery voltage as the sole source of electrical power to the image intensifier tube, and utilizing the image intensifier tube to provide a visible image in response to receipt of light when battery voltage is connected to provide said sole source of electrical power to the image intensifier tube; providing a low-voltage voltage step-up circuit receiving battery power at battery voltage and responsively providing an intermediate voltage which is above battery voltage; providing a high-voltage voltage step-up circuit receiving said intermediate voltage and responsively providing high voltage levels to the image intensifier tube for operation of the image intensifier tube; providing said low-voltage voltage step-up circuit with a shutdown terminal causing said low-voltage voltage step-up circuit to reduce its output from said intermediate voltage to substantially less than battery voltage when a certain signal is provided at said shutdown terminal, so that said battery voltage is not connected to provide said sole source of electrical power to the image intensifier tube upon said certain signal being provided to said shutdown terminal; and utilizing a switch circuit responsive to a pre-determined criteria to provide said certain signal to said shutdown terminal. - View Dependent Claims (11, 12)
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13. A night vision device (NVD) comprising:
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an image intensifier tube; a source of electrical power for said image intensifier tube; and a tilt switch in a first position of said NVD allowing electrical power supply to said image intensifier tube, and in a second position of said NVD said tilt switch causing electrical power supply to said image intensifier tube to be discontinued so that said image intensifier tube is turned off;
further including a time delay circuit in association with said tilt switch and delaying the turning off of said image intensifier tube for a certain interval after movement of the NVD from said first to said second position.
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14. A night vision device (NVD) comprising:
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an image intensifier tube providing a visible image in response to a supply of electrical power and the receipt of light; a source of electrical power for the image intensifier tube; an optical system admitting light to the image intensifier tube; a switch circuit supplying electrical power from said source to said image intensifier tube, and being responsive to an output response to effect a shut down of said image intensifier tube; an acceleration-responsive element responding to acceleration applied to said NVD to provide said output response; and a time delay element which for a certain time interval after said output response delays the shutting down of said image intensifier tube.
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Specification