TWM495526U - Surface mounted device type diffractive optical laser module - Google Patents

Abstract

The present invention discloses a surface mounted device type diffractive optical laser module. The surface mounted device type laser module includes a housing, an edge-emitting type laser diode unit, a reflective element, a diffractive optical element and a substrate accommodated in the housing for integrating the edge-emitting type laser diode unit. The substrate has at least one surface transmitting structure exposed to the housing and the substrate so as to have an electronic signal passes through the surface transmitting structure. The laser beam provided by the edge-emitting type laser diode unit is reflected by the reflective element for passing through an opening of the housing. Since the diffractive optical element is integrated with the surface mounted device type diffractive optical laser module, the specified laser projection pattern designed by the diffractive optical element can be well performed.

Description

Surface-fixed diffractive optical laser module

This creation is directed to a laser module, and more particularly to a diffractive optical laser module of the type of surface mount component.

Please refer to FIG. 1 , which is a perspective view showing a partial structure of a conventional laser module. The conventional laser module 1 adopts a coaxial package (TO CAN) type, including a mask 11, a susceptor 12, a laser diode 13, a photodiode 14, a heat sink 15, and a first solder fillet 16. And the second soldering leg 17, and the heat sink 15 and the photodiode 14 are fixed on the base 12, and the laser diode 13 is disposed on the heat sink 15; wherein the laser diode 13 and The photodiode 14 is connected to the first solder fillet 16 and the second solder fillet 17 through the wires 18 and 19, respectively, and the first solder fillet 16 and the second solder fillet 17 respectively pass down through the base 12 and protrude. In addition, it is used to pass through the perforation of an external circuit board (not shown) to be soldered on the circuit board, so that the electronic signal can be transmitted between the laser module 1 and the circuit board. .

Furthermore, the mask 11 is disposed on the base 12 for covering the laser diode 13, the light-sensitive diode 14 and the heat sink 15, and the mask 11 has an opening 111 and a collimating lens. Placed thereon; when the laser diode 13 receives power via the first solder fillet 16, a laser beam L1 can be provided, and most of the laser beam L11 will travel toward the opening 111 of the mask 11 and The collimator lens 10 is output to the outside, and A small portion of the laser beam L12 is projected in the direction of the light-sensitive diode 14 for light detection by the light-sensitive diode 14; wherein the light-sensitive diode 14 generates a detection during the detection process. The test signals are transmitted to the circuit board via the second solder pins 17 for subsequent control programs.

In particular, in the past, in order to solder the laser module 1 to the circuit board, the laser module 1 is additionally provided for passing through the first solder fillet 16 and the second solder fillet 17 of the circuit board; however, this type of soldering The foot has a limitation of its minimum size, otherwise the soldering foot is easily broken by external force, but the package method causes the laser module 1 to be ineffectively miniaturized, let alone apply it to a handheld device, a wearable device, etc. Thin, short design on electronic devices.

Moreover, the conventional laser module 1 often has too much space due to the limitation of its structure when integrating optical components (such as the collimator lens 10), and is also one of the reasons why the miniaturization demand cannot be achieved. In addition, the conventional laser module 1 is mostly based on a single light source, and thus cannot meet the requirements of multiple light sources or multiple wavelengths required by today's electronic devices, thereby limiting the speed of electronic devices such as handheld devices and wearable devices. Development; according to the above description, the conventional laser module 1 still needs to be improved.

The main purpose of this creation is to provide a surface mounted device (SMD) type of laser module, which reduces the overall size of the electronic device to be applied, and uses reflection in the housing of the laser module. The optical component changes the transmission path of the laser beam provided by the edge-emitting laser diode unit, so that the thickness of the surface-fixed diffractive optical laser module can be effectively reduced, so it is suitable for use in a handheld device or a wearable device. On electronic devices that are light, thin, and short.

Another object of the present invention is to provide a surface-fixed laser module incorporating a diffractive optical element, so that the effect of laser diffraction projection can be exerted, and the laser module can also have multiple edge-emitting lasers. The diode unit can meet the multi-source or multi-wavelength requirements of today's electronic devices, thereby accelerating handheld devices and wearing Development of electronic devices such as wearable devices.

In a preferred embodiment, the present invention provides a surface-fixed diffractive optical laser module comprising: a housing having an opening; a base housed in the housing and having exposure to the base At least one surface transmission structure outside the housing and the housing for passing at least one electronic signal therein; a side-emitting laser diode unit fixed to the base and providing at least one laser beam; a collimating optical element Fixed on the housing and located on the opening; an optical diffraction element fixed to the housing and located on the opening, wherein the collimating optical element is disposed between the optical diffractive element and the base; And a reflective optic for projecting a first portion of the at least one laser beam and reflecting the first portion of the at least one laser beam to sequentially pass the first portion through the shell The opening of the body, the collimating optical element and the optical diffractive element.

In a preferred embodiment, the surface-fixed diffractive optical laser module further includes a photo-sensing diode unit disposed on the pedestal, and the edge-emitting laser diode unit is located at the reflective optics And between the photodiode units; wherein a second portion of the at least one laser beam is projected to the photodiode unit for detection by the photodiode unit.

In a preferred embodiment, a center laser beam of the at least one laser beam is projected onto the reflective optic from a center of one of the illumination regions of the edge-emitting laser diode unit. Reflected vertically to travel toward the optical center of at least one of the collimating optical element and the optical diffractive element.

In a preferred embodiment, the angle between the first optical axis of one of the collimating optical elements and the second optical axis of one of the optical diffractive elements is less than 2.5 degrees.

In a preferred embodiment, the effective focal length f of one of the collimating optical elements satisfies the following conditional formula: 0.5 mm < f < 3 mm.

In a preferred embodiment, the numerical aperture N.A. of one of the collimating optical elements satisfies the following conditional formula: N.A.<0.4.

In a preferred embodiment, the reflective optic includes a mirror, and the mirror has an aspherical surface for projecting the first portion of the at least one laser beam onto the mirror And reflecting such that the first portion of the at least one laser beam travels in a direction that is less than 2 degrees from the first optical axis of the collimating optical element.

In a preferred embodiment, the surface-fixed diffractive optical laser module further includes a further edge-emitting laser diode unit and a further reflective optical member; wherein the edge-emitting laser diode And any one of the laser beam provided by the unit and the other edge-emitting laser diode unit is reflected after being projected to at least one of the reflective optics and the other reflective optic to pass the shell The opening of the body.

In a preferred embodiment, the edge-emitting laser diode unit includes a plurality of laser diode wafers to provide a plurality of laser beams.

1‧‧‧Laser module

2‧‧‧Surface-fixed diffractive optical laser module

11‧‧‧ mask

12‧‧‧ Pedestal

13‧‧‧Laser diode

14‧‧‧Light diopter

15‧‧‧ Heat sink

16‧‧‧First solder fillet

17‧‧‧Second solder fillet

18‧‧‧Wire

19‧‧‧Wire

21‧‧‧ housing

22‧‧‧ pedestal

23‧‧‧Side-emitting laser diode unit

24‧‧‧Light diode unit

25‧‧‧Reflective optics

26‧‧‧Optical components

111‧‧‧ openings

211‧‧‧ openings

212‧‧‧ Groove

221‧‧‧Surface transmission structure

231‧‧‧Laser Diode Wafer

251‧‧‧Mirror

261‧‧‧ Collimating optics

262‧‧‧Optical diffractive components

2611‧‧‧ optical axis

2612‧‧‧Lightheart

2612‧‧‧ optical axis

2622‧‧‧Lightheart

L1‧‧‧Laser beam

L2‧‧‧Laser beam

L11‧‧‧Laser beam

L12‧‧‧Laser beam

L21‧‧‧Laser beam

L22‧‧‧Laser beam

L211‧‧‧Center laser beam

Figure 1: is a partial structural diagram of a conventional laser module.

FIG. 2 is a schematic view showing the appearance of a surface-fixed diffractive optical laser module according to a preferred embodiment.

3 is a perspective exploded view of the surface-fixed diffractive optical laser module shown in FIG. 2.

Figure 4 is a partial front elevational view of the surface-mounted diffractive optical laser module of Figure 2.

FIG. 5 is a schematic view showing the appearance of a part of another embodiment of the surface-fixed diffractive optical laser module of the present invention.

Please refer to FIG. 2 to FIG. 4 . FIG. 2 is a schematic diagram showing the appearance of a surface-fixed diffractive optical laser module according to a preferred embodiment. FIG. 3 is a schematic diagram of FIG. FIG. 4 is a front perspective view showing a partial structure of the surface-fixed diffractive optical laser module shown in FIG. 2. FIG. The surface-fixed diffractive optical laser module 2 includes a housing 21, a susceptor 22, an edge-emitting type LD unit 23, a photodiode (PD) unit 24, and a reflection The optical member 25 and the plurality of optical components 26, and the susceptor 22 is housed in the housing 21, and carries one or more edge-emitting laser diode units 23, a photodiode unit 24, and a reflective optics 25, and may provide a flat surface or a recess having a bottom surface for fixing one or more edge-emitting type laser diode units 23, a light-sensitive diode unit 24, and a reflective optical member 25; wherein the base 22 has The plurality of surface transfer structures 221 exposed to the outside of the susceptor 22 and the housing 21 have a thickness that is much smaller than the thickness of the susceptor 22 and the housing 21, and can be soldered to the circuit board through a solder paste (not shown) so that The electronic signal of the surface-fixed diffractive optical laser module 2 can be transmitted into the circuit board through the surface transmission structure 221, and the electronic signal from the circuit board can also be transmitted through the surface transmission structure 221 into the surface-fixed type. Diffractive optical laser module 2; preferably, surface transmission structure 221 can be electrically gasketed Form or pin form, but not limited to the above.

Furthermore, in addition to being fixed to the susceptor 22, the reflective optics 25 described above may be fixed in place in the housing 21. In addition, the reflective optics 25 in the present case may broadly include a mirror, a fixing mechanism for fixing the mirror, or an adjustment mechanism for adjusting the angle of the mirror, which is merely illustrative and practical. The mirror, the fixing mechanism and the adjustment mechanism may be fixed to the base 22 or the housing 21, or may be fixed at different places. Moreover, although the pedestal 22 is shown in the form of a rectangular parallelepiped, it is not limited thereto, and the application can be designed according to actual needs.

Moreover, the housing 21 and/or the base 22 can provide heat dissipation, and the housing 21 has an opening 211. The circular shape and size of the opening 211 are not limited to those shown in the drawings, and may be other shapes and sizes. The laser beam within the light transmissive housing 21 can pass through to the outside world. Furthermore, the plurality of optical elements 26 are disposed at the opening 211 or adjacent to the opening 211, and the edge-emitting laser diode unit 23 includes a laser diode wafer 231 which is located in the horizontal direction. Between the optical member 25 and the photodiode unit 24, in the vertical direction, the susceptor 22 and the plurality of optical components Between 26; wherein the edge-emitting laser diode unit 23 can provide a plurality of laser beams L2 after receiving power (such as receiving power via the surface transmission structure 221), and the first portion of the laser beams L2 The (main portion) light beam L21 travels in the direction of the reflective optics 25 so as to be projected onto the reflective optics 25 and then reflected by the reflective optics 25 to travel toward the opening 211 of the housing 21 for the plurality of optical components. 26 is optically processed and outputted outward; in addition, the second (secondary) beam L22 of the laser beam L2 is projected in the direction of the photodiode unit 24 for the photodiode The unit 24 performs light detection, and the light sensing diode unit 24 generates a detection signal during the detection process, and transmits the detection signals to the outside through the surface transmission structure 221 for subsequent related control programs. .

In the preferred embodiment, the plurality of optical elements 26 include a collimating optical element 261 and a diffractive optical element (DOE), and the collimating optical element 261 is fixed to the housing 21. At the opening 211, the optical diffractive element 262 is located above the collimating optical element 261 and is fixed to the recess 212 on the housing 21; wherein the collimating optical element 261 is used to collimate the reflected optic 25 The reflected laser beam L21 causes the laser beam L21 passing through the collimating optical element 261 to be incident on the optical diffractive element 262 in a preferred incident direction, and the optical diffractive element 262 is used to pass the collimating optical element 261. The laser beam L21 performs beam shaping and is externally outputted. Generally, the surface-fixed diffractive optical laser module 2 becomes a generator of a specific structure light source through the grain design of the optical diffraction element 262. The effect of the laser diffraction projection can be exerted; however, the optical diffraction element itself is known to those skilled in the art and will not be described again here.

Preferably, the collimating optical element 261 and/or the optical diffractive element 262 are respectively coated with an anti-reflection coating to increase the light transmittance, and the effective focal length f of the collimating optical element 261 and The numerical aperture NA satisfies the following conditional formula: 0.5 mm < f < 3 mm, NA < 0.4, but not limited to the above.

Furthermore, the reflective optics 25 includes at least one mirror 251, and the mirror 251 has an aspherical surface, such as a biconic surface, for projecting to The laser beam L21 thereon can travel in a direction less than 2 degrees from the optical axis 2611 (first optical axis) of the collimating optical element 261, and the aspherical surface also has modified surface-fixed diffractive optics. The effect of the spot shape output by the laser module 2. Preferably, a central laser beam L211 of the plurality of laser beams L21 is projected from the center of the light-emitting region of the edge-emitting laser diode unit 23 to the mirror 251 and then vertically upward. The reflection travels in the direction toward the optical centers 2612, 2622 of the optical elements 26 (the light rays passing through the front and rear directions of the dots). Moreover, in the present case, considering the error caused by the reflective optics 25 such that the central laser beam L211 cannot be reliably reflected vertically, the optical axis 2611 of the collimating optical element 261 and the optical axis 2612 of the optical diffractive element 262 (second The offset between the optical axes) is preferably less than 0.2 mm, and the angle between the optical axis 2611 of the collimating optical element 261 and the optical axis 2612 of the optical diffractive element 262 is preferably less than 2.5 degrees.

Moreover, in another preferred embodiment, the collimating optical element 261 and the optical diffractive element 262 are integrated into a single optical structure; alternatively, a plate is disposed between the collimating optical element 261 and the optical diffractive element 262. In order to overcome the error caused by the integration of the collimating optical element 261 and the optical diffractive element 262, the plate system uses materials different from the collimating optical element 261 and the optical diffractive element 262 to oppose the laser beam L21. The direction of penetration is corrected and the light transmittance is increased.

In particular, the present invention provides that the laser diode 231 of the edge-emitting laser diode unit 23 is disposed parallel to the susceptor 22 such that the laser provided by the laser diode 231 is provided. The light beam L21 is incident on the reflective optical member 25 in a nearly horizontal manner, and is transmitted through the reflective optical member 25 to cause the laser light beam L21 incident thereon to be reflected from the opening 211 of the casing 21 to be substantially outwardly reflected upward, thereby being effective. Reducing the thickness of the laser module, and because the design of the laser module is a surface mounted device (SMD) type, it can effectively reduce the overall volume, so that it can be applied to handheld devices, wearable Light, thin, and short design of electronic devices such as devices.

Of course, the above is only an embodiment, and those skilled in the art can make any equal change design according to actual application requirements. For example, the design can be changed. In order to fix the reflective optics 25 at the non-base 22, such as in a suitable place in the housing 21; for example, although the surface-mounted diffractive optical laser module of the above embodiment includes only a single The one-shot laser diode unit 23 and the single reflection optics 25 are modified, but as shown in FIG. 5, the pedestal 22 includes a plurality of edge-emitting laser diode units 23 and a plurality of reflective optics. The device 25 is suitably configured to be compatible with the same photodiode unit 24, and any laser beam provided by the laser diode chip 231 of any of the side-emitting laser diode units 23 can be The corresponding reflecting optics 25 are reflected and travel toward the opening 211 of the housing 21 for outward output. Similarly, when a single edge-emitting type laser diode unit 23 has a plurality of laser diode chips 231, the purpose of the present invention can be achieved in a similar manner.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, any equivalent changes or modifications made without departing from the spirit of the present invention should be included in the present case. Within the scope of the patent application.

21‧‧‧ housing

22‧‧‧ pedestal

23‧‧‧Side-emitting laser diode unit

24‧‧‧Light diode unit

25‧‧‧Reflective optics

26‧‧‧Optical components

211‧‧‧ openings

212‧‧‧ Groove

221‧‧‧Surface transmission structure

261‧‧‧ Collimating optics

262‧‧‧Optical diffractive components

Claims (9)

A surface-mounted diffractive optical laser module comprising: a housing having an opening; a base housed in the housing and having at least one surface transmission structure exposed to the base and the housing Providing at least one electronic signal therethrough; a side-emitting laser diode unit fixed to the base and providing at least one laser beam; a collimating optical element fixed to the housing and located on the opening; An optical diffractive element fixed to the housing and located on the opening, wherein the collimating optical element is disposed between the optical diffractive element and the base; and a reflective optic for the at least one thunder Projecting a first portion of the beam of light onto the first portion of the at least one laser beam such that the first portion sequentially passes through the opening of the housing, the collimating optical element, and The optical diffractive element. The surface-mounted diffractive optical laser module of claim 1, further comprising a photo-sensing diode unit disposed on the pedestal, wherein the edge-emitting laser diode unit is located Between the reflective optics and the photodiode unit; wherein a second portion of the at least one laser beam is projected to the photodiode unit for detecting the photodiode unit Measurement. The surface-mounted diffractive optical laser module of claim 1, wherein one of the at least one laser beam is coupled to one of the laser diodes from the edge-emitting laser diode A center of one of the light-emitting regions is projected onto the reflective optic and then vertically reflected to travel toward the optical center of at least one of the collimating optical element and the optical diffractive element. The surface-mounted diffractive optical laser module of claim 1, wherein the first optical axis of the collimating optical element and the second optical axis of the optical diffractive element are The angle between them is less than 2.5 degrees. The surface-fixed diffractive optical laser module of claim 1, wherein the effective focal length f of the collimating optical element satisfies the following conditional formula: 0.5 mm <f<3 PCT. The surface-mounted diffractive optical laser module of claim 1, wherein the numerical aperture N.A. of the collimating optical element satisfies the following conditional formula: N.A.<0.4. The surface-mounted diffractive optical laser module of claim 1, wherein the reflective optical member comprises a mirror, and the mirror has an aspherical surface, the aspherical surface. And the first portion of the at least one laser beam is incident thereon and reflected such that the first portion of the at least one laser beam is along an error angle with the first optical axis of the collimating optical element Travel in directions less than 2 degrees. The surface-mounted diffractive optical laser module of claim 1, 2 or 3, further comprising a further edge-emitting type laser diode unit and a further reflecting optical element; wherein the side And the laser beam diode unit and any of the other side-emitting laser diode units are coupled to the at least one of the reflective optics and the other reflective optic Reflected to pass through the opening of the housing. The surface-mounted diffractive optical laser module of claim 1, wherein the side-emitting laser diode unit comprises a plurality of laser diode chips to provide a plurality of laser diode packages. Laser beams.