Method and system for deploying a mirror assembly from a recessed position
There is disclosed a method and apparatus for deploying a mirror assembly from a recessed position that includes rotating the mirror assembly in a first direction about a first axis, the mirror assembly coupled proximate the first axis to at least one lifting arm and rotating each lifting arm in a second direction about a second axis such that the mirror assembly moves to an operational position. The first direction may be opposite from the second direction.
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The present application is a divisional of U.S. Ser. No. 10/162,797 filed Jun. 4, 2002, entitled Method and System for Deploying a Mirror Assembly from a Recessed Position, now U.S. Pat. No. 6,808,274.
TECHNICAL FIELD OF THE INVENTIONThis invention relates generally to mirror display systems and, more particularly, to a method and system for deploying a mirror assembly from a recessed position.
BACKGROUND OF THE INVENTIONDuring daylight hours, the driver of a vehicle is able to readily detect and recognize objects that would be difficult or impossible to detect or recognize at night. For example, assume that a deer wanders into the road approximately 500 meters ahead of the vehicle. If this scenario occurs in the middle of a sunny day, the driver will not only be able to detect the fact that something is present ahead, but will readily recognize that it is a deer. On the other hand, if this same scenario occurs at night, particularly when the only illumination is from the headlights of the vehicle, the driver will not be able to detect that anything is there, much less recognize that it is a deer, because the deer will be beyond the range of the headlights. Moreover, by the time the driver does detect that something is in the road, and well before the driver can recognize what it is, the driver will be much closer to the deer than would be the case during daylight hours. Accordingly, the risk of a resulting accident is much higher at night than during the day.
Consequently, in order to supplement the natural vision of a driver, and thus reduce the risk of accidents, night vision systems have been developed for vehicles, including automobiles sold in the consumer market. Typical night vision systems include an infrared camera unit, which gathers information regarding the scene in front of the vehicle, mounted in the grill of the vehicle and a head-up display, which projects an image derived from information provided by the camera unit onto an imaging mirror for view by the driver of the vehicle.
SUMMARY OF THE INVENTIONThe present invention provides a method and system for deploying a mirror assembly from a recessed position that substantially eliminates or reduces at least some of the disadvantages and problems associated with previous methods and systems.
In accordance with a particular embodiment of the present invention, a method for deploying a mirror assembly from a recessed position includes rotating the mirror assembly in a first direction about a first axis, the mirror assembly coupled proximate the first axis to at least one lifting arm and rotating each lifting arm in a second direction about a second axis such that the mirror assembly moves to an operational position. The first direction may be opposite from the second direction.
The method may also include directing energy from a scene toward a detector, receiving energy from a portion of the scene at each of a plurality of detector elements, converting the energy received at each detector element into information representative of the received energy and forming a visible image using the information representative of the received energy. The visible image may be projected onto a fold mirror and reflected to an imaging mirror of the mirror assembly.
In accordance with another embodiment, a system for deploying a mirror assembly from a recessed position includes a mirror assembly coupled proximate a first axis to at least one lifting arm. The mirror assembly is operable to rotate in a first direction about the first axis. Each lifting arm is operable to rotate in a second direction about a second axis such that the mirror assembly moves to an operational position. The first direction may be opposite from the second direction.
The system may also include a lens system operable to direct energy from a scene toward a detector and a display unit coupled to the detector. The display unit is operable to form a visible image using information received from the detector. The detector may include an array of detector elements each operable to receive energy from a portion of the scene and to convert the received energy into information representative of the received energy and to send the information associated with at least some of the detector elements to the display unit. The display unit may comprise a liquid crystal display operable to project the visible image onto a fold mirror, wherein the fold mirror is configured to reflect the visible image to an imaging mirror of the mirror assembly.
Technical advantages of particular embodiments of the present invention include a mirror assembly that deploys by rotating in a first direction so that there is enough clearance between an end of the mirror assembly and a cover surrounding the mirror assembly to avoid contact between the end and the cover when the mirror assembly rotates in a second direction into an operational position. In addition, the mirror assembly can be aesthetically and effectively integrated with a surrounding cover and dashboard of a vehicle while in its recessed and non-operational position. For example, gaps between the mirror assembly and surrounding cover may be sized to allow for small manufacturing variances in the size of components of the assembly while still small enough for cosmetic integration with the dashboard.
Other technical advantages will be readily apparent to one skilled in the art from the following figures, descriptions and claims. Moreover, while specific advantages have been enumerated above, various embodiments may include all, some or none of the enumerated advantages.
BRIEF DESCRIPTION OF THE DRAWINGSFor a more complete understanding of particular embodiments of the invention and their advantages, reference is now made to the following descriptions, taken in conjunction with the accompanying drawings, in which:
The camera unit 30 is also electrically coupled to a computer 60 at 69. The computer 60 is also part of the auxiliary vision system 20 and provides instructions to camera unit 30 based on heading information it receives from an angle encoder 70, which is coupled to a steering column 16 of vehicle 10 and electrically coupled to computer 60 at 79, and/or an inclinometer 80, which is coupled to the frame of vehicle 10 and electrically coupled to computer 60 at 89. Angle encoder 70 and inclinometer 80, which are two types of sensors, are also a part of auxiliary vision system 20. In general, any type of sensor that can provide information regarding the heading of vehicle 10, such as, for example, steering rate, inclination rate, and/or orientation, may be used in auxiliary vision system 20. Additionally, one, two, or even several sensors may be used in different embodiments. Particular embodiments, however, may not include an angle encoder or inclinometer. The auxiliary vision system 20 of
When a driver is operating a vehicle at night, the driver's ability to see the road ahead is substantially more limited than would be case for the same section of road during daylight hours. This is particularly true in a rural area under conditions where there is little moonlight, there are no street lights, and there are no headlights of other vehicles. If an animal such as a deer happens to wander into the road at a location 500 meters ahead of the vehicle, the driver would readily notice and recognize the deer during daylight hours, whereas at night the deer may initially be beyond the effective reach of the illumination from the vehicle's headlights. Moreover, even when the headlights begin to illuminate the deer, the driver may not initially notice the deer, because the deer may be a brownish color that is difficult to distinguish from the surrounding darkness. Consequently, at the point in time when the driver first realizes that there is a deer in the road, the vehicle will be far closer to the deer in a nighttime situation than would be the case during daylight hours. There are many other similar high risk situations, for example, where a pedestrian is walking along the road.
A primary purpose of auxiliary vision system 20 of
Thus, in addition to the visible image that is directly observed by the driver through the windshield of the vehicle based on headlight illumination and any other available light, the auxiliary vision system 20 provides a separate and auxiliary image, based on infrared radiation, that is reflected onto imaging mirror 17. This auxiliary image can provide a detectable representation of lifeforms or objects ahead that are not yet visible to the naked eye. Further, the auxiliary image can provide a much more striking contrast than a visible image between the lifeforms or objects and the surrounding scene. Note that the auxiliary vision system 20 may also be useful during daylight hours to supplement the view of objects seen with natural light.
In the disclosed embodiment, the chopper 34 is a rotating disk of a known type. As the chopper 34 is rotated, it modulates the incoming infrared radiation to the detector 36.
Also in the disclosed embodiment, the detector 36 is a commercially available focal plane array or staring array detector, which has a two-dimensional matrix of detector elements, where each detector element produces a respective pixel of a resulting image. In particular, detector 36 is an uncooled pyroelectric barium strontium titanate (BST) detector, although numerous other types of detectors would also be useful in auxiliary vision system 20.
The circuitry 38 is provided to control the detector 36 and read out the images that it detects, and also to synchronize the chopper 34 to operation of the detector 36. Further, based on information from computer 60, the circuitry 38 sends the information obtained from detector 36 through the electrical coupling 39 to the circuitry 42 within the display unit 40.
The circuitry 42 controls a liquid crystal display (LCD) 44, which in the disclosed embodiment has a two-dimensional array of pixel elements. The display unit 40 has a horizontal to vertical aspect ratio of 10:3.3. Other embodiments may include a display unit having a different horizontal to vertical aspect ratio. The circuitry 42 takes successive images obtained from the detector 36 through circuitry 38, and presents these on the LCD 44. The LCD 44 may include backlighting that makes the image on LCD 44 visible at night.
This visible image is projected onto a fold mirror 48 that reflects the image so as to be directed onto imaging mirror 17, creating a virtual image for the driver. Although fold mirror 48 and imaging mirror 17 are shown diagrammatically in
Once the driver has finished adjusting the imaging mirror to a suitable position, it remains in that position during normal operation of the auxiliary vision system 20.
In
In
In
Frame 130 is coupled to lifting arms 136 by coupling members 132. Coupling members 132 may comprise shoulder bolts or any other suitable components configured to couple frame 130, to lifting arms 136. In this embodiment, coupling members 132 comprise shoulder bolts that tighten against frame 130 and rotate freely within lifting arms 136 to allow mirror assembly 102 to rotate about the ends of lifting arms 136. As shown, the frame 130 is coupled to two lifting arms 136; however, in other embodiments frame 130 may be coupled to one or more than two lifting arms.
Bias springs 140 are located between frame 130 and a notch 142 of lifting arms 136. Bias springs 140 push frame 130 away from notch 142 of lifting arms 136 to provide for the rotation of the mirror assembly about the end of lifting arm 136 during deployment described above with respect to
As illustrated, lifting arms 136 are coupled to gears 138. The gears 138 rotate lifting arms 136 which provides for the rotation of mirror assembly 102 to a fully deployed and operational position as described above with respect to
At step 202, each lifting arm 136 is rotated in a second direction about a second axis (crosshair 116) such that the mirror assembly 102 moves to an operational position. In particular embodiments the second direction of rotation may be opposite the first direction of rotation. Moreover, the rotation described in step 202 may occur simultaneous with the rotation described in step 200.
The method continues at step 204 where energy from a scene 50 is directed towards a detector 36. At step 206, energy from a portion of the scene is received at each of a plurality of detector elements. At step 208, the energy received at each detector element is converted into information representative of the energy received at step 206. At step 210, a visible image is formed using the information representative of the received energy. The visibly image is projected onto a fold mirror 48 at step 212. Such projection may occur by a liquid crystal display (LCD). At step 214, the visible image is reflected by the fold mirror 48 onto an imaging mirror 17 of the mirror assembly 102 for view by the driver of a vehicle. Through the visible image, the driver may detect lifeforms or objects ahead that are not yet visible to the naked eye.
It should be understood that particular embodiments may include a mirror assembly deployed as described herein that displays an image other than an image detected by a camera unit mounted in the grill of a car. For example, in particular embodiments, the mirror assembly may display navigation information, dashboard information or any other information or image, such as an image from any video input.
Particular embodiments of the present invention provide a mirror assembly that deploys by rotating in a first direction so that there is enough clearance between an end of the mirror assembly and a cover surrounding the mirror assembly to avoid contact between the end and the cover when the mirror assembly rotates in a second direction into an operational position. In addition, the mirror assembly can be aesthetically and effectively integrated with a surrounding cover and dashboard of a vehicle while in its recessed and non-operational position. For example, gaps between the mirror assembly and surrounding cover may be sized to allow for small manufacturing variances in the size of components of the assembly while still small enough for cosmetic integration with the dashboard.
Although the present invention has been described in detail, various changes and modifications may be suggested to one skilled in the art. It is intended that the present invention encompass such changes and modifications as falling within the scope of the appended claims.
Claims
1. A method for deploying a mirror assembly from a recessed position, comprising:
- rotating the mirror assembly recessed within a dash of an automobile in a first direction about a first axis, the mirror assembly coupled proximate the first axis to at least one lifting arm; and
- rotating each lifting arm in a second direction about a second axis such that the mirror assembly moves to an operational position that is not recessed within the dash of an automobile.
2. The method of claim 1, wherein rotating the mirror assembly in a first direction about a first axis comprises biasing the mirror assembly such that an end of the mirror assembly lifts from a recessed position.
3. The method of claim 1, wherein rotating the mirror assembly in a first direction about a first axis comprises biasing the mirror assembly such that the mirror assembly rotates about at least one coupling member coupling the mirror assembly to each lifting arm.
4. The method of claim 1, wherein rotating each lifting arm comprises rotating each lifting arm using a gear mechanism.
5. The method of claim 1, wherein rotating the mirror assembly in a first direction comprises relieving compression on a spring adjacent the mirror assembly to rotate the mirror assembly from the recessed position.
6. A system for deploying a mirror assembly from a recessed position, comprising:
- a mirror assembly recessed within a dash of an automobile and coupled proximate a first axis to at least one lifting arm, the mirror assembly operable to rotate in a first direction about the first axis; and
- wherein each lifting arm operates to rotate in a second direction about a second axis such that the mirror assembly moves to an operational position that is not recessed within a dash of an automobile.
7. The system of claim 6, further comprising at least one spring located between the mirror assembly and a notch of each lifting arm, the spring operable to bias the mirror assembly such that an end of the mirror assembly rotates in the first direction from a recessed position.
8. The system of claim 6, further comprising at least one spring located between the mirror assembly and a notch of each lifting arm, the spring operable to bias the mirror assembly such that the mirror assembly rotates in the first direction about at least one coupling member coupling the mirror assembly to each lifting arm.
9. The system of claim 6, further comprising a gear mechanism operable to move each lifting arm to rotate each lifting arm in the second direction about the second axis.
10. The system of claim 6, wherein the first direction and the second direction comprise opposite directions.
11. The system of claim 6, further comprising a stop feature operable to compress a spring adjacent the mirror assembly to maintain the mirror assembly in the recessed position.
12. A method for deploying a mirror assembly from a recessed position, comprising:
- rotating the mirror assembly recessed within a dash of an automobile in a first direction about a first axis, the mirror assembly coupled proximate the first axis to at least one lifting arm; and
- rotating each lifting arm in a second direction opposite the first direction about a second axis such that the mirror assembly moves to an operational position that is not recessed within a dash of an automobile.
Type: Application
Filed: Oct 25, 2004
Publication Date: May 19, 2005
Applicant:
Inventors: Aaron Raines (Dallas, TX), Todd Mendez (Carrollton, TX)
Application Number: 10/973,032