Proximity detector
First Claim
1. Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source (1) and a light detector (3) adapted to receive resulting back-scattered light from the reference object when illuminated from the light source (1), whereby the intensity of back-scattered light to the light detector (3) is utilized as a measure of said proximity, characterized in that the target object (2) comprises an optical device (4) having a focal plane (7) and being adapted to be illuminated by the light source (1), that the axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions, and that said proximity corresponds to a spacing (relative position) between the target object (2) and the reference object (6,8) wherein the reference object is located substantially at the focal plane.
3 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source and a light detector adapted to receive resulting back-scattered light from the reference object when illuminated from the light source, whereby the intensity of back-scattered light to the light detector is utilized as a measure of said proximity. The target object comprises an optical device having a focal plane and being adapted to be illuminated by the light source. The axes of the light rays from the light source and the back-scattering to the light detector have mutually closely adjacent and substantially parallel or coincident portions. Said proximity corresponds to a distance (relative position) between the target object and the reference object wherein the reference object is located substantially at the focal plane.
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Citations
12 Claims
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1. Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source (1) and a light detector (3) adapted to receive resulting back-scattered light from the reference object when illuminated from the light source (1), whereby the intensity of back-scattered light to the light detector (3) is utilized as a measure of said proximity, characterized in that the target object (2) comprises an optical device (4) having a focal plane (7) and being adapted to be illuminated by the light source (1), that the axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions, and
that said proximity corresponds to a spacing (relative position) between the target object (2) and the reference object (6,8) wherein the reference object is located substantially at the focal plane.
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11. Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source (1) and a receiver for resulting back-scattered light from the reference object when illuminated from the light source (1), whereby the intensity of back-scattered light to the receiver is utilized as a measure of said proximity,
characterized in that the target object (2) comprises an optical device (4) having a focal plane (7) and being adapted to be illuminated by the light source (1), that the axes of the light rays from the light source (1) and back-scattering to the receiver have mutually closely adjacent and substantially parallel or coincident portions, that said proximity corresponds to a distance (relative position) between the target object (2) and the reference object (6,8) wherein the reference object is located substantially at the focal plane, and that the receiver is adapted to cooperate with an eye belonging to a user of the apparatus.
Specification