# US 11,994,660 B2 · Light-emitting module

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- Number: US 11,994,660 B2
- Document ID: US11994660B2
- Status: Granted
- Kind: B2
- Application number: 17/881,565
- Filed: 2022-08-04
- Published: 2024-02-08
- Granted: 2024-05-28
- Earliest claimed: 2022-08-04
- Assignees: Hergy International Corp.
- Applicants: Hergy International Corp.
- Inventors: Chun-Hung Lu; Hong-Jyun Wang
- Web page: https://patentgrep.com/patent/US11994660B2

## CPC

- G02B 19/0009: {having refractive surfaces only}
- G02B 3/06: with cylindrical or toric faces
- G02B 19/0066: {in the form of an LED array}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A light-emitting module (1) includes a light-emitting unit (10) and a rod lens (20). The light-emitting unit (10) outputs a light (11). The rod lens (20) is adjacent to the light-emitting unit (10), and converges the light (11) along an optical axis (100). A radial direction of the rod lens (20) is parallel to the optical axis (100). A distance between an axis (21) of the rod lens (20) and a light-emitting center (12) of the light-emitting unit (10) along the radial direction is greater than or equal to a focal length of the rod lens (20) along the radial direction.

## Claims

### Claim 1

A light-emitting module (1) comprising:
a light-emitting unit (10) configured to output a light (11); and
a rod lens (20) adjacent to the light-emitting unit (10), and configured to converge the light (11) along an optical axis (100);
wherein a radial direction of the rod lens (20) is parallel to the optical axis (100), a distance between an axis (21) of the rod lens (20) and a light-emitting center (12) of the light-emitting unit (10) along the radial direction is greater than or equal to a focal length of the rod lens (20) along the radial direction;
wherein a light-emitting angle of the light-emitting unit (10) outputting the light (11) is less than or equal to 2θ;
wherein a following relationship is satisfied:
θ
=
tan
-
1
(
(
W
2
)
/
f
)
wherein f is the focal length of the rod lens (20) along the radial direction and W is a diameter of the rod lens (20) along the radial direction.

### Claim 2 (depends on 1)

The light-emitting module (1) of claim 1, wherein the number of the light-emitting units (10) is plural, and the light-emitting units (10) are arranged in parallel along the axial direction of the rod lens (20) as a linear array light source (101).

### Claim 3 (depends on 1)

The light-emitting module (1) of claim 1, further comprising:
a lens holder (30) configured to hold the rod lens (20) along the radial direction of the rod lens (20) perpendicular to the optical axis (100);
wherein the distance between the axis (21) of the rod lens (20) and the light-emitting center (12) of the light-emitting unit (10) along the radial direction is equal to the focal length of the rod lens (20) along the radial direction.

### Claim 4 (depends on 3)

The light-emitting module (1) of claim 3, wherein the lens holder (30) comprises:
two bracket units (31) arranged opposite to each other along the radial direction of the rod lens (20), and symmetrically bent at a non-zero angle along the optical axis (100).

### Claim 5 (depends on 3)

The light-emitting module (1) of claim 3, wherein the lens holder (30) comprises:
a protection mechanism (40, 40A, 40B) arranged on at least one side surface of the rod lens (20) along the axial direction, and protruding out of the side surface along the optical axis (100).

### Claim 6 (depends on 5)

The light-emitting module (1) of claim 5, wherein a portion of the protection mechanism (40, 40A, 40B) protruding beyond the side surface is a plane.

### Claim 7 (depends on 1)

The light-emitting module (1) of claim 1, further comprising:
a protection mechanism (50, 50A, 50B) arranged on at least one side surface of the rod lens (20) along the axial direction, and protruding out of the side surface along the optical axis (100).

### Claim 8 (depends on 7)

The light-emitting module (1) of claim 7, wherein, a portion of the protection mechanism (50, 50A, 50B) protruding beyond the side surface is a plane.