Rear-view system for vehicles

• US 5,526,195 A
• Filed: 04/29/1994
• Issued: 06/11/1996
• Est. Priority Date: 10/31/1991
• Status: Expired due to Fees

• Current Assignee: Optical Perspectives Limited
• Original Assignee: Optical Perspectives Limited
• Inventors: Thomas, Justin M.
• Primary Examiner(s): Dzierzynski, Paul M.
• Assistant Examiner(s): SIKDER, MOHAMMAD YUNUS
• Application Number:
  US08/232,175
• Time in Patent Office: 774 Days
• Field of Search: 359/850, 359/854, 359/857, 359/837, 359/867, 359/866, 359/853, 359/726, 359/727, 359/729, 359/731, 359/861, 359/737
• US Class Current: 359/850
• CPC Class Codes: B60R 1/10 Front-view mirror arrangements; specially adapted for covering the peripheral part of the vehicle B60R1/002; Periscope arrangements , i.e. optical devices using combinations of mirrors, lenses, prisms or the like specially adapted for covering the peripheral part of the vehicle B60R1/002; for viewing traffic-lights B60R1/005; Other mirror arrangements giving a view from above or under the vehicle

Abstract

A rear view system for a vehicle (10) includes in combination a light transmitting member (2) and a light reflective medium (16) spatially displaced from the member. The member has a first face (4) for light emergence from which in use light rays are directed towards the medium (16) and a second face (6) for light incidence, each face being disposed on a respective side of a median plane (8). The member (2) comprises a plurality of elemental prismatic sections, the prismatic angles of the elemental sections progressively changing along the length of the member whereby rays of refracted light emerging through the first face are in parallelism or substantial parallelism one with the other irrespective of the angles of incidence of the rays. The shape of the light transmitting member (2) is such as to afford a wide angular scope of view to the system thereby to enhance safety.

Claims

1. A motorized road vehicle having a driving position (14) and a rear view system which comprises in combination:

a) a prismatic lens located at a front side door position of the vehicle and having a first portion with a concave first face for light emergence, and having a second portion with a convex second face for light incidence, each face being disposed on a respective side of a median plane, the second face being arranged to capture rays of light incident from a rear and from a side of the vehicle, and each of the first face and the second face having angles of curvature which progressively change along the length of the lens, wherein rays of light emerge through the first face parallel or substantially parallel one with the other irrespective of the angle of incidence of the rays, and are directed by said first face across a portion of the vehicle interior; and

b) a light reflective member separated by a distance from said prismatic lens, and directly in or adjacent to the direct forward line of sight of a driving position, wherein said directed rays of light pass directly from the first face to the light reflective member and are reflected by the light reflective member for viewing by a driver.

2. The vehicle of claim 1, wherein a forward end of the lens has first and second faces disposed so that light passes substantially undeviated from a side of the vehicle to the light reflective member.

3. A vehicle according to claim 1, wherein the lens has first and second faces arranged so that the rays of light undergo essentially minimum deviation through the lens.

4. A vehicle according to claim 1, in which the shape of the first face of the member is generated by a locus of points calculated by the following formulae wherein the `y` axis is aligned along the median plane and the `x` axis extends orthogonally thereto:

space="preserve" listing-type="equation">x.sub.n =sin [(A.sub.n +d.sub.n)/2]·

f.sub.n /cos (A.sub.n /2)+x.sub.n-1

space="preserve" listing-type="equation">y.sub.n =cos [(A.sub.n +d.sub.n)/2]·

f.sub.n /cos (A.sub.n /2)+y.sub.n-1

wherein ##EQU3##

5. A vehicle according to claim 1, in which the shape of the second face of the member is generated by a locus of points calculated by the following formulae wherein the `y` axis is aligned along the median plane and the `x` axis extends orthogonally thereto:

space="preserve" listing-type="equation">x.sub.n =[sin {(A.sub.n -d.sub.n)/2}]·

[f.sub.n +sin {(d.sub.n -d.sub.n-1 /2}·

W.sub.n-1 ]/cos (A.sub.n /2)+x.sub.n

space="preserve" listing-type="equation">y.sub.n =[cos {(A.sub.n -d.sub.n)/2}]·

[f.sub.n +sin {(d.sub.n -d.sub.n-1 /2}·

W.sub.n-1 ]/cos (A.sub.n /2)+y.sub.n

wherein ##EQU4##

6. A vehicle according to claim 1, in which the light reflective member is a mirror.

7. A vehicle according to claim 1, in which the first face is angularly oriented relative to the median plane.

8. A vehicle according to claim 1, in which a a second prismatic lens is located on a a second front side door of the vehicle.

9. A vehicle according to claim 1, including means for positively directing the rays emerging from the first face of the lens onto the light reflective member.

10. A vehicle according to claim 1, in which the lens is integral with the door.

11. A vehicle according to claim 10, in which the lens is streamlined.

12. A vehicle according to claim 1, in which the light reflective member is disposed on or in a dashboard of the vehicle for ease of visibility.

13. A vehicle according to claim 1, in which the light reflective member is orientable.

14. A rear view system for a motorized road vehicle which comprises in combination:

a) a prismatic lens adapted for mounting on a front side door of the vehicle and having a first portion with a concave first face for light emergence and a second portion with a convex second face for light incidence, each face being disposed on a respective side of a median plane, the second face being arranged to capture rays of light incident from a rear and from a side of the vehicle, and each of the first face and the second face have angles of curvature which progressively change along the length of the lens, wherein rays of light pass directly from said second portion to said first portion, emerge from the first face parallel or substantially parallel one with the other irrespective of the angle of incidence of the rays, and are directed by said first face across a portion of the vehicle interior; and

b) a light reflective member separated by a distance from said prismatic lens, and adapted for mounting directly in or adjacent to the direct forward line of sight of a driving position, wherein said directed rays of light pass in a substantially straight line from the first face to the light reflective member and are reflected by the light reflective member for viewing by a driver.

15. A vehicle rear vision system comprising:

a mirrorless light transmitting means, located on a right side or left side of a vehicle, for collecting light rays representing an object located a distance from said side of the vehicle; and

a reflective device, separated by a distance from said light transmitting means and disposed in a direct forward line of sight of a vehicle operator, for directly receiving said light rays from the light transmitting means and for reflecting said light rays to be within the direct forward line of sight of the vehicle operator;

wherein said light rays are directed by said light transmitting means to said reflective device in a substantially straight line.

16. A vehicle rear vision system according to claim 15, wherein said mirrorless light transmitting means is a prismatic lens and said reflective device is a mirror.

17. A vehicle rear vision system according to claim 15, wherein said reflective device includes a mirror and the system includes only a single reflective device.

18. A vehicle rear vision system according to claim 15, further comprising:

a second mirrorless light transmitting means, located on another side of the vehicle and separated by a distance from said reflective device, for collecting second light rays representing an object located a distance from said another side of the vehicle;

wherein said second light rays are directed by said second light transmitting means to said reflective device in a substantially straight line and said reflective device reflects said second light rays to be within the direct forward line of sight of the vehicle operator.

19. A vehicle rear vision system according to claim 18, wherein each of said mirrorless light transmitting means and said second mirrorless light transmitting means is a prismatic lens and said reflective device includes at least one mirror.

20. A vehicle rear vision system according to claim 18, wherein said reflective device includes a mirror and the system includes only a single reflective device.