# US 12,007,580 B2 · Reticle unit and optical sighting device

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- Number: US 12,007,580 B2
- Document ID: US12007580B2
- Status: Granted
- Kind: B2
- Application number: 17/290,993
- Filed: 2018-11-28
- Published: 2022-02-10
- Granted: 2024-06-11
- Earliest claimed: 2018-11-28
- Assignees: Light Optical Works, Ltd.
- Applicants: Light Optical Works, Ltd.
- Inventors: Masatomi Iwanami; Kan Hanaoka; Toru Murakami
- Web page: https://patentgrep.com/patent/US12007580B2

## CPC

- G02B 27/34: illuminated
- F41G 1/345: {for illuminating the sights}
- F41G 1/38: Telescopic sights specially adapted for smallarms or ordnance (telescopic sights in general G02B); Supports or mountings therefor {(Means for mounting sighting or aiming devices on firearms F41G11/001)}
- G02B 23/00: Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B)

## Abstract

Provided is a reticle unit 40 that includes a reticle 41 with a sight line 410, and an optical fiber 42 that forms a dot by guiding light from a light source to a center 410a of the sight line 410, wherein a light incident portion 42a for receiving light is formed at one end of the optical fiber 42, a light-emitting portion 42b for emitting light is formed at the other end 42b of the optical fiber 42, the light incident portion 42a has a spherical surface having a diameter greater than that of the optical fiber 42, the light-emitting portion 42b has an inclined surface that reflects light passing through the optical fiber 42, and the optical fiber 42 is fixed along a part of the sight line 410 so that the light-emitting portion 42b is positioned at the center 410a of the sight line 410.

## Claims

### Claim 1

A reticle unit comprising:
a reticle that has a sight line;
an optical fiber that forms a dot by guiding light from a light source to a center of the sight line; and
a metal frame to which the reticle is attached,
wherein a light incident portion for receiving light is formed at one end of the optical fiber and arranged in a cutout portion of the metal frame,
a light-emitting portion for emitting light is formed at another end of the optical fiber,
the light incident portion has a spherical surface that has a diameter greater than a diameter of the optical fiber,
the light-emitting portion has an inclined surface that reflects light passing through the optical fiber, and
the optical fiber is fixed along a part of the sight line so that the light-emitting portion is positioned at the center of the sight line.

### Claim 2 (depends on 1)

The reticle unit according to claim 1, wherein the optical fiber has a diameter equal to or smaller than a line width of the sight line and is bonded along a part of the sight line.

### Claim 3 (depends on 1)

The reticle unit according to claim 1, wherein the optical fiber is composed of a glass material, and the light incident portion is formed by thermally melting one end of the optical fiber.

### Claim 4 (depends on 1)

The reticle unit according to claim 1, wherein an angle of the inclined surface of the light-emitting portion is 45 degrees, and the inclined surface reflects light passing through the optical fiber at a right angle.

### Claim 5 (depends on 1)

The reticle unit according to claim 1, wherein the reticle is made of a thin metal plate, and the sight line is integrally provided on the metal plate.

### Claim 6

An optical sighting device with a reticle unit built in a lens barrel,
wherein the reticle unit comprises a reticle that has a sight line, an optical fiber that forms a dot by guiding light from a light source to a center of the sight line, and a metal frame to which the reticle is attached,
a light incident portion for receiving light is formed at one end of the optical fiber and arranged in a cutout portion of the metal frame,
a light-emitting portion for emitting light is formed at another end of the optical fiber,
the light incident portion has a spherical surface that has a diameter greater than a diameter of the optical fiber,
the light-emitting portion has an inclined surface that reflects light passing through the optical fiber, and
the optical fiber is fixed along a part of the sight line so that the light-emitting portion is positioned at the center of the sight line.

### Claim 7 (depends on 2)

The reticle unit according to claim 2, wherein the optical fiber is composed of a glass material, and the light incident portion is formed by thermally melting one end of the optical fiber.

### Claim 8 (depends on 2)

The reticle unit according to claim 2, wherein an angle of the inclined surface of the light-emitting portion is 45 degrees, and the inclined surface reflects light passing through the optical fiber at a right angle.

### Claim 9 (depends on 3)

The reticle unit according to claim 3, wherein an angle of the inclined surface of the light-emitting portion is 45 degrees, and the inclined surface reflects light passing through the optical fiber at a right angle.

### Claim 10 (depends on 2)

The reticle unit according to claim 2, wherein the reticle is made of a thin metal plate, and the sight line is integrally provided on the metal plate.

### Claim 11 (depends on 3)

The reticle unit according to claim 3, wherein the reticle is made of a thin metal plate, and the sight line is integrally provided on the metal plate.

### Claim 12 (depends on 4)

The reticle unit according to claim 4, wherein the reticle is made of a thin metal plate, and the sight line is integrally provided on the metal plate.