# US 5,189,555 A · Parallax free optical sighting device

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- Number: US 5,189,555 A
- Document ID: US5189555A
- Status: Granted
- Kind: A
- Application number: 07/521,151
- Filed: 1990-05-08
- Granted: 1993-02-23
- Earliest claimed: 1989-05-10
- Assignees: Aimpoint AB
- Inventors: Rickard Jorlov
- Web page: https://patentgrep.com/patent/US5189555A

## CPC

- G02B 23/14: Viewfinders (for photographic apparatus G03B13/02)
- G02B 23/105: {Sighting devices with light source and collimating reflector (reflecting sights for small arms having light source F41G1/34)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A parallax free sight which utilizes a concave-convex lens with a parabolic shaped optical surface attached to one end of a light channel, the concave side of the lens faces into the light channel, the perimeter dimensions of the lens is adapted to the rectangular shape and dimensions of the light channel, with the longer sides of the rectangular lens perimeter positioned in a horizontal plane when the sight is in use. A transparent body is attached to the other end of the light channel. A light emitting source is arranged at the focal point of the concave side of the lens, between the lens and the transparent body. The light source can be a light emitting material or an electrical light source, powered by a rechargeable battery or a solar cell, or both. A light reflective layer is attached to the concave side of the lens to only reflect light of the wavelengths corresponding to the light emitted by the light emitting source.

## Claims

### Claim 1

Parallax free sight, comprising:
a casing having a rectangular cross section forming an elongated light channel;
a concave-convex lens with a parabolic shaped optical surface attached to one end of said light channel, said concave side of said lens facing into said light channel, the perimeter dimensions of said lens being adapted to the rectangular shape and dimensions of said light channel, the longer sides of said rectangular lens perimeter positioned in a horizontal plane when the sight is in use;
a semi-reflective mirror surface provided on said concave side of said lens, said semi-reflective mirror surface having a focal point;
a transparent body attached to the other end of said light channel;
an electrical light emitting means arranged at said focal point of said semi-reflective mirror surface, said semi-reflective mirror surface reflecting light of a wave length corresponding to the light emitted by said light emitting means;
a battery contained within a protected space connected to said light emitting means; and
at least one solar cell on an outside surface of said casing, said solar cell being electrically connected to said electrical light emitting means.

### Claim 2 (depends on 1)

Parallax free sight according to claim 1, further wherein said solar cell supplies charging current to said battery.

### Claim 3 (depends on 1)

Parallax free sight according to claim 1, wherein a power supply circuit is provided for the driving of said light emitting means, said power circuit being adjustable so as to control the intensity of the light emitted from said light emitting means.

### Claim 4 (depends on 1)

Parallax free sight according to claim 1, wherein said light emitting means comprises a luminous material.

### Claim 5 (depends on 1)

Parallax free sight according to claim 1, wherein said light emitting means is formed as a spot.

### Claim 6 (depends on 1)

Parallax free sight according to claim 1, wherein said light emitting means comprises a plurality of spots mutually spaced along the periphery of a circle.

### Claim 7 (depends on 1)

Parallax free sight according to claim 1, wherein said light emitting means is bar-shaped.

### Claim 8 (depends on 1)

Parallax free sight according to claim 1, wherein said light emitting means is cross-shaped.

### Claim 9

Parallax free sight, comprising:
a casing having a rectangular cross section forming an elongated light channel;
a concave-convex lens with a parabolic shaped optical surface attached to one end of said light channel, said concave side of said lens facing into said light channel, the perimeter dimensions of said lens being adapted tot he rectangular shape and dimension of said light channel, the longer sides of said rectangular lens perimeter positioned in a horizontal plane when the sight is in use;
a semi-reflective mirror surface provided on said concave side of said lens, said semi-reflective mirror surface having a focal point;
a transparent body attached to the other end of said light channel;
an electrical light emitting means arranged at the focal point of said semi-reflective mirror surface; and
at least one solar cell on an outside surface of said casing, said solar cell being electrically connected to said electrical light emitting means.