A license plate assembly includes a frame receiving a conventional license plate and at least one blanking flash generator arranged to generate a blanking flash at the license plate in response to a monitoring flash from an external monitoring device. The monitoring device is designed to take an image of the license plate and the blanking flash is obscuring the license plate to prevent or interfere with the taking of the image.
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1. A license plate assembly for a motor vehicle, comprising:
a frame sized and shaped to extend around and receive a license plate;
a sensor arranged in said frame to sense a monitoring flash generated by a license plate recording device;
a control device coupled to said sensor and arranged in said frame; and
a plurality of blanking flash generators that are each coupled to said control device and housed in said frame, said control device configured to control an operation of the blanking flash generators to generate a blanking flash in response to said monitoring flash and obscure said license plate and thereby prevent the license plate recording device from recording at least part of said license plate.
6. A license plate assembly for a motor vehicle, and comprising:
a frame sized and shaped to extend around a perimeter of a license plate and receive the license plate;
a sensor disposed in said frame and arranged to sense a monitoring flash generated by a license plate recording device;
a control device disposed in said frame and coupled to said sensor; and
a plurality of flash generators mounted in said frame and coupled to said control device, configured to generate said blanking flash at said license plate,
wherein said control device is configured to control an operation of the blanking flash generators to each generate a blanking flash in response to said monitoring flash and direct said blanking flash at the license plate to obscure said license plate and thereby prevent the license plate recording device from recording at least part of said license plate.
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11. The license plate assembly of
12. The license plate assembly of
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This application claims priority to provisional application Ser. No. 61/472,384 filed Apr. 6, 2011 and incorporated herein in its entirety
A. Field of Invention
This invention pertains to an apparatus and method for selectively blanking a license plate, said apparatus including one or more light sources embedded in a bezel surrounding the license plate, the light sources firing on demand to illuminate the license plate, rendering it unreadable.
B. Description of the Prior Art
Motor vehicles, and, by extension, the owners of motor vehicles, are uniquely identified by their license plates. However, the license plates of motor vehicles are routinely photographed or videotaped by many entities in various locations without permission from the owners of the respective motor vehicles. Since most entities, especially private entities, do not have the right to monitor the license plates of motor vehicles, these activities often constitute flagrant violations of the expectations of privacy of the respective individuals. The present invention provides a means of preventing such privacy violations.
Briefly, the present invention provides a plate assembly that prevents an external monitoring device from making a useful image of a motor vehicle license plate. Typically, monitoring devices for performing such recording include a camera and a generator producing a monitoring flash consisting of at least one short burst of radiation that could be either in the visible light range or in the infrared range. The monitoring flash is a precursor to the actual recording and is used to insure that the motor vehicle and license plate are properly illuminated and/or to focus a camera associated with or incorporated into the monitoring device. Because it is important to obtain a clear image of the license plate, some monitoring device include means for generating a first monitoring flash used to determine the actual distance from the monitoring device (or camera) to the license plate.
Moreover, some monitoring device may include two cameras spaced apart from each by several feet and arranged to provide better coverage for the monitoring device. In such an arrangement, two monitoring flashes may be generated for each camera; the first being used to determine the distance to the license plate and the second for illuminating the license plate for a good image. Of course, typically, the two cameras do not take the image at exactly the same time but one may be delayed somewhat with respect to the other.
The present invention detects the monitoring flashes and, in response, generates a blanking flash in the form of an intense light beam directed at shallow angle at the license plate thereby blanking the license plate for a short time period. This blanking coincides with the generation of an image by the camera.
Specifically, after releasing the monitoring flash, the recording device triggers the camera and the camera then captures either a single image (for a photograph) or a plurality of images (for a video clip). In the present invention, the intense light pattern from the blanking flash causes the license plate to appear as a featureless or bright surface and the license plate in any image or images taken by the cameras appear blank because the camera's light sensors become oversaturated. As a result the alphanumeric characters on the license plate will be invisible, or at least partially obstructed so that they cannot be recognized.
If a second monitoring flash is detected within a very short time period after the first one, then it is assumed that the first monitoring flash was intended for metering and the second monitoring flash was intended to generate an image of the license plate and, accordingly, the second monitoring flash is followed by a second blanking flash. Preferably the intensity of the second flash is equal to or higher than the first. As previously mentioned, some monitoring devices may be using four sets of monitoring flashes, two for each of two cameras. Since normally there isn't enough time between the operations of the cameras to recharge the charging circuitry driving the flash generators for the blanking flashes, preferably, four separate flash generating means are provided.
In one embodiment, of the invention, a flash suppression means is also provided which discharges the circuitry used to drive the blanking flash generators.
Referring first to
The frame 10 is preferably made of a suitable plastic material and includes a bezel that forms the outside surface of the frame 10 and includes peripheral lip 14 that extends over and covers the peripheral edges 16 of plate 112 as shown. The bezel may be raised to provide sufficient room for the flash generators. Preferably, the generators may be sealed and protected by by a transparent cover of a plastic material such as acrylic, Lexan®, tampered glass, or other similar transparent materials.
The assembly 100 includes an electronic component 18 that can be powered by one or more batteries (not shown) dedicated for the component and included in the frame 100. However preferably, the assembly 100 is powered from the car battery (not shown) using standard wire connectors (not shown). The assembly 100 includes a flash sensor 20 arranged and constructed to sense one or more monitoring flashes as discussed in more detail below.
The sensor 20 is connected to the component 18, which also controls the operation of several flash generators 22. In
The positions of the component 18 and sensor 20 within frame 10 may be changed as well. If there is not enough in the frame, component 18 may be installed behind the license plate 12.
Preferably, the frame 100 is formed with appropriate cavities for housing the component 18, sensor 29 and flash generators 22. The bezel is placed over the cavities and secured to the rest of the frame 10 thereby sealing these cavities to keep the component 18, sensor 20 and flash generators 22 so that they will not come into contact with water (during rain and snow) and other materials, such as salt, etc. The cavities (not shown) holding the flash generators 22 can be coated with a reflective coating that directs light from the flash generator toward the license plate 12. A portion of the bezel disposed above the sensor 20 is made of clear or transparent material that allows radiation to enter into and be sensed by sensor 20. In an alternate embodiment, an IR filter may be placed above the sensor 20 to eliminate the effects or reduce the effects of ambient light.
The flash generators 22 are constructed and arranged to generate a high light pattern directed at plate 12. In
The bezel and lip 14 perform several functions. They hides and protects the circuitry shown in
The operation of the assembly 100 of
Since it is expected the first and third monitoring flashes are used to determine the distance from the cameras to the license plate and the second and fourth monitoring flashes are the ones used to illuminate the license plates, the system 100 is arranged so that the second and fourth blanking flashes have higher intensities (e.g., by 20-50%) to insure that the license plate is blanked (or, more accurately, the sensors of the cameras in the monitoring device are overloaded) and the alphanumeric characters (or any other images) on the license plate will be either invisible or at least unreadable on any images obtained by the camera.
The flash generators are typically strobe-type devices.
As soon as a blanking flash is generated, the capacitor bank is recharged by recharging circuit RC automatically to the nominal voltage value. Usually it takes about 3 seconds to recharge the bank of capacitors C.
The energy stored in the capacitive bank is relatively high and touching any terminals of the bank could be dangerous. Therefore safety elements (not shown) may be added that automatically discharge the capacitor bank through a dummy load (not shown) or other means. This operation may be initiated by a SUPPRESS FLASH signal the control circuit 30. Various conditions can trigger this signal, such as turning the engine off, dismounting the frame 10, etc.
Obviously numerous modifications can be made to the invention without departing from the scope of the invention as defined in the appended claims. For example, a cover plate 19 maybe provided on top of the license plate made of an active material such as an electrochromatic material that is normally transparent and becomes opaque when in the presence of an electric field or when current is passing through it (or vice versa). The cover plate may be made of other similar materials that their light transmissive characteristics in response to an electrical signal.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Apr 04 2012 | NOLIMITS ENTERPRISES INC. | (assignment on the face of the patent) | / | |||
Oct 02 2013 | DANDROW, JONATHAN | NOLIMITS ENTERPRISES INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 031496 | /0224 |
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