JP-7857164-B2 - Laser device and method for manufacturing a laser device

JP7857164B2JP 7857164 B2JP7857164 B2JP 7857164B2JP-7857164-B2

Inventors

山澤賢悟
藤井憲晃
田村覚
越後武志

Assignees

フォックスコン福山テクノロジーズ株式会社

Dates

Publication Date: 20260512
Application Date: 20220606

Claims (6)

A laser package comprising a substrate, a laser diode mounted on the substrate and emitting light in a direction parallel to the main surface of the substrate, and a cap for sealing the laser diode, the cap having a surface that transmits the emitted light, A plano-convex lens that collimates the emitted light, A support plate disposed between the laser package and the plano-convex lens, the support plate having an aperture through which the emitted light passes, The plano-convex lens is fixed such that the outer periphery of the planar side of the lens surface of the plano-convex lens is in contact with the first plane, which is the surface of the support plate on the plano-convex lens side . The optical axis of the plano-convex lens is parallel to the main surface of the substrate, The first plane of the support plate is perpendicular to the main surface of the substrate, The support plate has a uniform thickness and is bonded to the surface of the cap through which the emitted light passes. The plano-convex lens is directly fixed to the first plane of the support plate in the laser device.
The laser apparatus according to claim 1, wherein the optical distance between the light-emitting surface of the laser diode and the planar lens surface of the plano-convex lens is 0.8 mm or more and 1.2 mm or less.
The laser apparatus according to claim 2, wherein the thickness of the plano-convex lens along its optical axis is 0.4 mm or more and 1.0 mm or less.
The laser apparatus according to claim 3, wherein the effective diameter of the plano-convex lens is 1.2 mm or more and 1.6 mm or less.
The laser package has a plurality of laser diodes, The laser apparatus according to any one of claims 1 to 4, further comprising a plurality of plano-convex lenses for collimating the light emitted from each of the laser diodes.
A method for manufacturing a laser apparatus according to claims 1 to 4, A step of adjusting the position of the plano-convex lens in the first plane perpendicular to the optical axis of the laser diode by sliding the support plate and the surface of the cap through which the emitted light is transmitted, A method for manufacturing a laser apparatus, comprising the step of subsequently bonding the support plate to the surface of the cap through which the emitted light is transmitted.

Description

This invention relates to a laser device. Laser devices equipped with laser diodes are widely used. In recent years, the development of wearable devices has progressed, and glasses for VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality) have been developed. These glasses often utilize laser scanning (LBS) optical systems. In the LBS (Laser-Blind Spot) method, a beam emitted from a laser device is scanned using a MEMS (Micro Electro Mechanical Systems) mirror, such as a piezoelectric type, to form an image. Strength Specification No. 10656426 This is a schematic diagram showing the configuration of the main parts of the laser device 1 according to Embodiment 1.This is a perspective view showing the configuration of the laser package according to Embodiment 1.This is a schematic diagram showing the optical geometric relationships of a typical convex lens 5d.This graph shows the correlation between working distance and radius of curvature.This graph shows the correlation between the working distance WD and the beam radius y² .This is a schematic diagram showing the configuration of the main parts of the laser device 1a according to Embodiment 2.This is a schematic diagram showing the configuration of the main parts of the laser device 1b according to Embodiment 3.This is a perspective view showing the configuration of the laser package according to Embodiment 3.This is a schematic diagram showing the configuration of the main parts of the laser device 1c according to Embodiment 4.This is a perspective view showing the configuration of the laser package according to Embodiment 4. [Embodiment 1] One embodiment of the present invention will be described in detail below. Figure 1 is a schematic diagram showing the configuration of the main parts of the laser device 1 according to Embodiment 1. (Configuration of laser device 1) As shown in Figure 1, the laser device 1 comprises a substrate 2, a laser diode 3, a cap 4, a plano-convex lens 5, and a support plate 6. The substrate 2, laser diode 3, and cap 4 are also referred to as the laser package. Figure 2 is a perspective view showing the configuration of the laser package according to Embodiment 1. The substrate 2 is the base component of the laser package. Preferably, the substrate 2 is made of a metal plate. A pattern is formed on the substrate 2 so that the laser diode 3 can be positioned at a location determined based on the design conditions described later. The laser diode 3 is a light source that emits laser light. The main direction of the emitted light from the laser diode 3 is parallel to the main surface of the substrate 2. While the wavelength of the light emitted by the laser diode 3 is not limited, it is preferably a wavelength that constitutes the image. The position of the laser diode 3 in the Z direction (the direction of propagation of the laser light emitted from the laser diode 3) is defined by a pattern formed on the substrate 2. The emission surface of the laser light emitted from the laser diode 3 is referred to as the emission surface 31. Cap 4 is a glass cap that seals the space in which the laser diode 3 is mounted. Cap 4 has a side surface (transmitting portion 41) that transmits the emitted light. The material of cap 4 is not limited to glass; any material with high transmittance at the desired wavelength is acceptable. Cap 4 does not need to be entirely made of glass; only the transmitting portion 41 that transmits the laser light emitted by the laser diode 3 needs to be made of glass (or a material with high transmittance). Furthermore, the transmitting portion 41 has a plane perpendicular to the laser light emitted by the laser diode 3. While the transmitting portion 41 is the side surface of cap 4, it may also be a part of the side surface. The plano-convex lens 5 is a convex lens in which one of its two surfaces is flat and the other is convex. The plano-convex lens 5 collimates the incident laser light. The flat lens surface of the plano-convex lens 5 is referred to as the lens surface 51. The lens surface 51 faces the transmissive portion 41 of the cap 4. The support plate 6 is a support member for the plano-convex lens 5, positioned between the laser package and the plano-convex lens 5. Its main surface is positioned parallel to the XY plane (the plane perpendicular to the laser beam emitted by the laser diode 3). The support plate 6 has an opening in the area through which the laser beam passes. This opening is slightly smaller than the diameter of the plano-convex lens 5, and the support plate 6 supports the plano-convex lens 5 at the overlapping portion. The plano-convex lens 5 may be fixed to the support plate 6 using adhesive. The surface (XY plane) on the support plate 6 that faces the lens surface 51 of the plano-convex lens 5 is called the first plane 61. The first plane 61 is perpendicular to the laser light emitted by the laser diode 3. The plano-convex lens 5 can slide while its lens surface 51 is in