# US 12,181,140 B2 · Light irradiation device

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- Number: US 12,181,140 B2
- Document ID: US12181140B2
- Status: Granted
- Kind: B2
- Application number: 18/390,881
- Filed: 2023-12-20
- Published: 2024-07-04
- Granted: 2024-12-31
- Earliest claimed: 2023-01-04
- Assignees: Hamamatsu Photonics K.K.
- Applicants: Hamamatsu Photonics K.K.
- Inventors: Ryota Sawaguchi; Kyoichi Murayama
- Web page: https://patentgrep.com/patent/US12181140B2

## CPC

- B41J 11/00214: {using UV radiation}
- F21V 29/59: {with forced flow of the coolant}
- B41J 11/00218: {Constructional details of the irradiation means, e.g. radiation source attached to reciprocating print head assembly or shutter means provided on the radiation source}
- B41J 29/377: Cooling or ventilating arrangements
- F21V 29/503: of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858)
- F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis}
- F21Y 2105/12: characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
- F21Y 2105/16: square or rectangular, e.g. for light panels
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

In a light irradiation device, a cooling section includes first and second plate-shaped portions, a plurality of first wall portions, a plurality of second wall portions, and a frame portion. The first plate-shaped portion is thermally connected to a plurality of light-emitting elements. Each of the first wall portions and each of the second wall portions are alternately disposed. Each of the first and second wall portions, and the frame portion are thermally connected to each of the first and second plate-shaped portions. The plurality of first passage portions in each of the first wall portions are arranged in a second direction, and are biased to the second plate-shaped portion side in a first direction. The plurality of second passage portions in each of the second wall portions are arranged in the second direction, and are biased to the first plate-shaped portion side in the first direction.

## Claims

### Claim 1

A light irradiation device, comprising:
a light irradiation section including a plurality of light-emitting elements being two-dimensionally arranged along a plane perpendicular to a first direction; and
a cooling section including an inlet port and an outlet port, and configured to cool down the plurality of light-emitting elements by circulating a coolant from the inlet port to the outlet port,
wherein the cooling section includes,
a first plate-shaped portion being thermally connected to the plurality of light-emitting elements,
a second plate-shaped portion facing the first plate-shaped portion in the first direction,
a plurality of first wall portions each extending between the first plate-shaped portion and the second plate-shaped portion in a second direction perpendicular to the first direction, and arranged in a third direction perpendicular to both the first direction and the second direction,
a plurality of second wall portions each extending between the first plate-shaped portion and the second plate-shaped portion in the second direction, and arranged in the third direction, and
a frame portion surrounding the plurality of first wall portions and the plurality of second wall portions between the first plate-shaped portion and the second plate-shaped portion,
the inlet port is disposed on one side in the third direction with respect to the plurality of first wall portions and the plurality of second wall portions,
the outlet port is disposed on the other side in the third direction with respect to the plurality of first wall portions and the plurality of second wall portions,
each of the plurality of first wall portions and each of the plurality of second wall portions are alternately disposed in a state of being spaced apart from each other,
each of the plurality of first wall portions is thermally connected to each of the first plate-shaped portion and the second plate-shaped portion,
each of the plurality of second wall portions is thermally connected to each of the first plate-shaped portion and the second plate-shaped portion,
the frame portion is thermally connected to each of the first plate-shaped portion and the second plate-shaped portion,
each of the plurality of first wall portions includes a plurality of first passage portions through which the coolant passes,
each of the plurality of second wall portions includes a plurality of second passage portions through which the coolant passes,
the plurality of first passage portions are arranged in the second direction and are biased to the second plate-shaped portion side in the first direction, and
the plurality of second passage portions arranged in the second direction and are biased to the first plate-shaped portion side in the first direction.

### Claim 2 (depends on 1)

The light irradiation device according to claim 1,
wherein each of the plurality of first wall portions includes,
a first main body portion extending in the second direction, and being thermally connected to the first plate-shaped portion, and
a plurality of first protrusions arranged in the second direction, and each being thermally connected to the second plate-shaped portion,
each of the plurality of first passage portions is a region between a pair of adjacent first protrusions among the plurality of first protrusions,
each of the plurality of second wall portions includes,
a second main body portion extending in the second direction, and being thermally connected to the second plate-shaped portion, and
a plurality of second protrusions arranged in the second direction, and each being thermally connected to the first plate-shaped portion, and
each of the plurality of second passage portions is a region between a pair of adjacent second protrusions among the plurality of second protrusions.

### Claim 3 (depends on 2)

The light irradiation device according to claim 2,
wherein the first main body portion and the plurality of first protrusions are formed integrally with the first plate-shaped portion,
each of the plurality of first protrusions is joined to the second plate-shaped portion with a brazing material,
the second main body portion and the plurality of second protrusions are formed integrally with the second plate-shaped portion,
each of the plurality of second protrusions is joined to the first plate-shaped portion with a brazing material,
the frame portion is formed integrally with one of the first plate-shaped portion and the second plate-shaped portion, and
the frame portion is joined to the other of the first plate-shaped portion and the second plate-shaped portion with a brazing material.

### Claim 4 (depends on 2)

The light irradiation device according to claim 2,
wherein each of the plurality of first protrusions and each of the plurality of second protrusions are formed in a square column shape.

### Claim 5 (depends on 1)

The light irradiation device according to claim 1,
wherein the thickness of the second plate-shaped portion is larger than the thickness of the first plate-shaped portion.

### Claim 6 (depends on 1)

The light irradiation device according to claim 1,
wherein when viewed in the first direction, a region where the plurality of light-emitting elements are disposed is included in a region where the plurality of first wall portions and the plurality of second wall portions are disposed at least in the third direction.

### Claim 7 (depends on 1)

The light irradiation device according to claim 1,
wherein the inlet port is formed in the second plate-shaped portion so as to face the first plate-shaped portion in the first direction.

### Claim 8 (depends on 1)

The light irradiation device according to claim 1,
wherein the cooling section further includes a plurality of radiation fins provided on a surface on an opposite side of the second plate-shaped portion from the first plate-shaped portion.

### Claim 9 (depends on 1)

The light irradiation device according to claim 1,
wherein at least one of first passage portions located at both ends among the plurality of first passage portions arranged in the second direction and second passage portions located at both ends among the plurality of second passage portions arranged in the second direction faces the frame portion.

### Claim 10 (depends on 9)

The light irradiation device according to claim 9,
wherein when viewed in the first direction, some light-emitting elements among the plurality of light-emitting elements overlap the frame portion.

### Claim 11 (depends on 1)

The light irradiation device according to claim 1,
wherein in a case where the inlet port is formed in the second plate-shaped portion, among the plurality of first wall portions and the plurality of second wall portions, a wall portion closest to the inlet port in the third direction is one of the first wall portions, and
in a case where the inlet port is formed in the first plate-shaped portion, among the plurality of first wall portions and the plurality of second wall portions, a wall portion closest to the inlet port in the third direction is one of the second wall portions.