# US 12,000,567 B2 · Light source device including first substrate supporting first and second laser diodes and second substrate supporting third laser diode

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- Number: US 12,000,567 B2
- Document ID: US12000567B2
- Status: Granted
- Kind: B2
- Application number: 17/996,339
- Filed: 2021-03-19
- Published: 2023-06-29
- Granted: 2024-06-04
- Earliest claimed: 2020-04-15
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Tadaaki Miyata
- Web page: https://patentgrep.com/patent/US12000567B2

## CPC

- F21V 19/0015: {Fastening arrangements intended to retain light sources}
- H01S 5/02315: Support members, e.g. bases or carriers
- H01S 5/02326: Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
- H01S 5/405: {Two-dimensional arrays}
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2113/30: {of visible and non-visible spectrum}
- F21Y 2115/30: Semiconductor lasers
- H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)}
- H01S 5/02208: characterised by the shape of the housings
- H01S 5/02345: Wire-bonding
- H01S 5/02469: {Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC}
- H01S 5/02476: {Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements}
- H01S 5/042: Electrical excitation {; Circuits therefor (monolithically integrated laser drive components H01S5/0261)}
- H01S 5/06825: {Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation}
- H01S 5/4093: {Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- 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

A light source device 100 includes a first substrate 10 having a first mounting surface 10a, a second substrate 11 having a second mounting surface 11a that opposes the first mounting surface, a first laser diode 30a directly or indirectly supported by the first mounting surface, a second laser diode 30b directly or indirectly supported by the first mounting surface, and a third laser diode 30c directly or indirectly supported by the second mounting surface. The emission point of the third laser diode is positioned between the emission point of the first laser diode and the emission point of the second laser diode in the width direction, and in a plan view, when viewed in the direction perpendicular to the first mounting surface, at least one the first laser diode and the second laser diode at least partially overlaps the third laser diode.

## Claims

### Claim 1

A light source device comprising:
a first substrate having a first mounting surface;
a second substrate having a second mounting surface that opposes the first mounting surface;
a first laser diode directly or indirectly supported by the first mounting surface;
a second laser diode directly or indirectly supported by the first mounting surface;
a third laser diode directly or indirectly supported by the second mounting surface; and
a frame that defines a space for housing the first laser diode, the second laser diode, and the third laser diode, the frame being in contact with the first and second mounting surfaces, wherein
the emission point of the third laser diode is positioned between the emission point of the first laser diode and the emission point of the second laser diode in the width direction, and
in a plan view, when viewed in the direction perpendicular to the first mounting surface, at least one of the first laser diode or the second laser diode at least partially overlaps the third laser diode.

### Claim 2 (depends on 1)

The light source device according to claim 1, wherein
the width direction distance from the emission point of the first laser diode to the second laser diode is smaller than the width direction distance from the center of the first laser diode to the second laser diode, or the width direction distance from the emission point of the second laser diode to the first laser diode is smaller than the width direction distance from the center of the second laser diode to the first laser diode.

### Claim 3 (depends on 1)

The light source device according to claim 1, wherein
the width of the gap between the first laser diode and the second laser diode is equal to or smaller than the width of the third laser diode.

### Claim 4 (depends on 3)

The light source device according to claim 3, wherein
the third laser diode is disposed to oppose the first laser diode, and
the distance in the height direction from the first mounting surface to the emission point of the second laser diode is equal to or larger than the distance in the height direction from the first mounting surface to the emission point of the first laser diode, and smaller than the distance in the height direction from the first mounting surface to the third laser diode.

### Claim 5 (depends on 4)

The light source device according to claim 4, wherein
the first laser diode is directly or indirectly face-up mounted on the first mounting surface, and
the third laser diode is directly or indirectly face-up mounted on the second mounting surface.

### Claim 6 (depends on 5)

The light source device according to claim 5, further comprising:
a first submount bonded to the first mounting surface and having the first laser diode disposed thereon, and
a second submount bonded to the second mounting surface and having the third laser diode disposed thereon, wherein
the first laser diode is face-up mounted on the mounting surface of the first submount, and
the third laser diode is face-up mounted on the mounting surface of the second submount.

### Claim 7 (depends on 6)

The light source device according to claim 6 wherein the second laser diode is bonded to the mounting surface of the first submount.

### Claim 8 (depends on 6)

The light source device according to claim 6, further comprising
a third submount bonded to the first mounting surface and having the second laser diode disposed thereon, wherein
the second laser diode is face-down mounted on the mounting surface of the third submount, and
the third submount is thicker than the first submount.

### Claim 9 (depends on 1)

The light source device according to claim 1, wherein the first laser diode, the second laser diode, and the third laser diode emit laser light of different peak wavelengths from one another.

### Claim 10 (depends on 8)

The light source device according to claim 8 wherein the second laser diode emits red light.

### Claim 11 (depends on 10)

The light source device according to claim 10 wherein the first laser diode emits green light and the third laser diode emits blue light.

### Claim 12 (depends on 1)

The light source device according to claim 1, wherein the optical axis of the outgoing laser light from the first laser diode, the optical axis of the outgoing laser light from the second laser diode, and the optical axis of the outgoing laser light from the third laser diode are positioned within a circle whose diameter is the smallest width among the widths of the first laser diode, the second laser diode, and the third laser diode.

### Claim 13 (depends on 10)

The light source device according to claim 10, further comprising
a fourth laser diode directly or indirectly supported by the second mounting surface, wherein
the distance in the height direction from the first mounting surface to the emission point of the fourth laser diode is equal to or larger than the distance in the height direction from the first mounting surface to the emission point of the first laser diode, and smaller than the distance in the height direction from the first mounting surface to the emission point of the third laser diode.

### Claim 14 (depends on 13)

The light source device according to claim 13 wherein the fourth laser diode emits infrared light.

### Claim 15 (depends on 13)

The light source device according to claim 13, further comprising
a fourth submount bonded to the second mounting surface and having the fourth laser diode disposed thereon.

### Claim 16 (depends on 6)

The light source device according to claim 6,
wherein
the frame includes a light transmitting part through which the outgoing light from each laser diode passes,
the light transmitting part has an incident surface on which the outgoing laser light from each laser diode becomes incident, and an emission surface through which the outgoing laser light from each laser diode exits, and
one end surface of each of the first submount and the second submount is partially in contact with the incident surface.

### Claim 17 (depends on 16)

The light source device according to claim 16, wherein
the portion of the end surface of the first submount in contact with the incident surface forms a first contact surface, the first contact surface being spaced apart from the first mounting surface, and
the portion of the end surface of the second submount in contact with the incident surface forms a second contact surface, the second contact surface being spaced apart from the second mounting surface.

### Claim 18 (depends on 17)

The light source device according to claim 17, wherein
a first wiring layer is disposed between the first submount and the first substrate and between the frame and the first substrate, the groove created in the first wiring layer spacing the first contact surface apart from the first mounting surface, and
a second wiring layer is disposed between the second submount and the second substrate and between the frame and the second substrate, the groove created in the second wiring layer spacing the second contact surface apart from the second mounting surface.

### Claim 19 (depends on 1)

The light source device according to claim 1, further comprising
a single lens for collimating the outgoing laser light from the first laser diode, the outgoing laser light from the second laser diode, and the outgoing laser light from the third laser diode.

### Claim 20 (depends on 1)

The light source device according to claim 1, wherein
the first laser diode, the second laser diode, and the third laser diode are hermetically sealed by the first substrate, the second substrate, and the frame.