 Unitary LCD display holder |
| The present invention provides for a one-piece or unitary holder for positively locating and ... |
|
| Video camera apparatus with grip axis and viewfinder optical axis in parallel relation |
| Accordingly, a primary object of the present invention is to provide a viewfinder interlinked-type ... |
|
| Liquid crystal display device |
| The present invention was made to overcome the above mentioned problems. Accordingly, an object of ... |
|
| Self-powered optically addressed spatial light modulator |
| This invention relates to a device that modulates a reading light wavefront that is transmitted ... |
|
| 2,3-difluorobenzene derivatives |
| We claim: 1. A compound having a 2,3-difluorophenylene group of the formula ##STR8## wherein R.sup.1... |
|
| Color phase control for projection display using spatial light modulator |
| A first aspect of the invention is a memory for a display system that uses a SLM and a motor-driven ... |
|
| Parallel and series electro-optic viewing and recording apparatus |
| What is claimed is: 1. An electro-optic device of the type having a photoconductive sheet and an ... |
|
| Liquid crystal device |
| It is therefore an object of the present invention to provide a liquid crystal display which can be ... |
|
| Method for improvidng the spatial resolution in an integrated adaptive optics apparatus |
| The present invention, by improving the resolving capability of a liquid crystal liquid valve ... |
|
| Local reference beam generator |
| It is an object of the present invention to provide an improved spatial filter and beam generator ... |
|
|
High intensity light shut-down circuit for night vision goggle
| Details |
Inventors: Kastendieck, William A.; Lee, Darrell E.;
Assignee: Varo, Inc. (Garland, TX)
Primary Examiner: Moore; David K.
Assistant Examiner: Powell; Mark R.
Attorney, Agent or Firm: Mills; Jerry W., Chauza; Roger N.
A circuit for automatically removing battery power from a night vision goggle (10) upon its detachment from a headgear (12) or when subjected to excessive light. A magnet (34) on the headgear (12) is magnetically coupled to a magnetic reed switch (36) fixed to the goggle (10). On detachment of the goggle (10) from the headgear (12), the reed switch (36) switches battery current to a goggle location monitor (75) for drilling on/off control logic (79) to remove power from an image intensifier tube (40). A high intensity light monitor (80) senses when the ambient light exceeds a predefined intensity, for a predetermined period of time, and also drives the control logic (79) to open a switch (86) in series with the battery (38) and the image intensifier tube (40). A low voltage monitor (82) provides a visual indication (84) of reduced battery voltages. |
|
DETAILED DESCRIPTION In accordance with the present invention, an electrical circuit for night vision goggles is provided which substantially reduces or eliminates the shortcomings previously associated with prior night vision goggles.
In accordance with the present invention, a battery control circuit is responsive to the detachment of the night vision goggle from the headgear to disconnect the battery.
The battery control circuit is responsive to a manual switch to reconnect the battery to appropriate circuits.
In order to detect detachment of the night vision goggle, a magnet is fixed to the headgear, and a magnetic reed switch is attached to the night vision goggle.
The magnet and magnetic reed switch are magnetically coupled when the night vision goggle is attached to the headgear.
A battery On-Off switch is provided on the night vision goggle, and is manually activated to control the application of battery power to the photomultiplier tube.
A low power bistable logic circuit is responsive to the removal of the goggle from the headgear by opening of the reed switch, to thereby disconnect the battery from the image intensifier tube of the night vision goggle.
The bistable logic circuit is placed in the other state when goggle is reattached and the reed switch closes, and the manual switch is cycled from the Off position to the On position.
A light intensity monitor is provided for sensing the brightness of light to which the image intensifier tube is subjected.
When the light intensity reaches a preset threshold value, such as when in a lighted room, a timer is activated.
If the light intensity exceeds the threshold for more than a minute, for example, the timer is operative to open a switch to automatically remove power from the image intensifier tube, as well as from other circuitry.
The switch is driven by control logic circuits in response to the light intensity monitor, and comprises a field effect transistor (FET) placed in series with the battery and the tube.
To provide an extremely low series resistance, the FET is driven by a voltage which is larger than the battery voltage
|
| Related patents |
|
|
Light level responsive control for light intensifier in night vision system
What is claimed is: 1. A night vision telescope, comprising: an electrically powered image intensifier; a source of electrical energy for operating said image ...
|
|
|
Mirror with dazzle light attenuation zone
OF THE APPARATUS OF THE INVENTION FIG. 1 is a cross-sectional view of a multilayered liquid-crystal matrix-type reflection mirror 10 of the invention, together with a ...
|
|
|
Active matrix LCD device with image signal lines having a multilayered structure
The first object of the present invention is to provide a liquid-crystal display device and a manufacturing method therefor where the number of processes for ...
|
|
|
Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester
OF THE INVENTION The catalyst for polyester production according to the present invention, a process for producing a polyester using the catalyst, a polyester obtained ...
|
|
|
Image enhancement method and apparatus
Referring now to FIG. 1 in one embodiment arranged for edge enhancement and size discrimination the subject invention includes a two barrel imaging system ...
|
|
|
LWIR sensor system with improved clutter rejection
A principal object of the present invention is to provide a radiant imaging system which is capable of distinguishing point source targets from background, illumination ...
|
|
|
Optical system
With this background of the invention in mind it is therefore an object of this invention to provide an improved optical system having a focusing system adapted to ...
|
|
|
Method of compensating scattered characteristics of outputs of an infrared detector of multiple-element type
It is a general object of the invention, therefore, to provide a simple and accurate method for compensating scattered characteristics of infrared temperature detecting ...
|
|
|
Radiometer with correction device
In accordance with the present invention, a radiometer mounted on a flying body for observing radiations or reflections of visible rays or infrared rays from the land or ...
|
|
|
Optoelectronic multibit beamsteering switching apparatus
In order to meet the above objectives, present invention comprises optoelectronic switching apparatus that is adapted for use in multibit beamsteering applications. The ...
|
|
|
LCD 
