Laser collimating module

Abstract

A laser collimating module includes a heat dissipating base having a fixing element on a top thereof and a plurality of pins at a bottom thereof, a laser diode chip disposed on the fixing element, a cap covering on the heat dissipating base with a placing space therein and an opening on a top thereof, and a cylindrical lens disposed in the placing space. The opening of the cap is connecting to the placing space and aligning with the laser diode chip correspondingly. The cylindrical lens has a first surface facing toward the laser diode chip with a first minimized distance arranged therebetween and a second surface facing toward the opening with a second minimized distance arranged therebetween. The laser diode chip is stimulated and emits an elliptical laser beam, and a light emitting angle is formed. As the elliptical laser beam passes through the cylindrical lens, the light emitting angle is narrowed and the laser beam is collimated to be a linear beam.

Claims

1. A laser collimating module comprising: a heat dissipating base including a fixing element on a top thereof and a plurality of pins at a bottom thereof; a laser diode chip disposed on said fixing element; a cap covering on said heat dissipating base and including a placing space therein and an opening on a top thereof, said opening arranged above said placing space and connecting thereto, correspondingly aligning with said laser diode chip; and a cylindrical lens disposed in said placing space, having a first surface facing toward said laser diode chip with a first minimized distance arranged therebetween and a second surface facing toward said opening with a second minimized distance arranged therebetween, thereby said laser diode chip being stimulated, emitting an elliptical laser beam to said cylindrical lens and forming a light emitting angle; as said laser beam passing through said cylindrical lens, said light emitting angle being narrowed and said laser beam being collimated and becoming a linear beam emitted from said laser collimating module, wherein the cap includes a flat surface on a lateral side thereof connecting to the placing space, forming a circular opening to be filled in with an adhesive for fixing a position of the cylindrical lens.

2. The laser collimating module as claimed in claim 1, wherein the cylindrical lens has a radius arranged between 0.5-1 mm.

3. The laser collimating module as claimed in claim 1, wherein the cylindrical lens is arranged in a shape of either cylindrical or semi-cylindrical.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1A is an exploded diagram of a conventional laser adjusting assembly;

(2) FIG. 1B is a schematic diagram illustrating an assembling process of the conventional laser adjusting assembly of FIG. 1A;

(3) FIG. 1C is a schematic diagram illustrating an optical path of the conventional laser adjusting assembly of FIG. 1A;

(4) FIG. 2A is a perspective view of the present invention before a cylindrical lens thereof is placed inside the laser collimating module;

(5) FIG. 2B is a perspective view of the present invention illustrating the cylindrical lens placed inside the laser collimating module before an adhesive is filled therein;

(6) FIG. 2C is a perspective view of the present invention illustrating the cylindrical lens placed inside the laser collimating module after an adhesive is filled therein;

(7) FIG. 3A is a partially sectional view of the present invention illustrating an inner structure thereof before the cylindrical lens is placed therein;

(8) FIG. 3B is a partially sectional view of the present invention illustrating an inner structure thereof after the cylindrical lens is placed therein;

(9) FIG. 3C is a sectional view of FIG. 3B;

(10) FIG. 4A is another partially sectional view of the present invention illustrating an inner structure thereof after the cylindrical lens is placed therein;

(11) FIG. 4B is a sectional view of FIG. 4A;

(12) FIG. 5A is a schematic diagram illustrating an optical path of the present invention;

(13) FIG. 5B is another schematic diagram illustrating the optical path of the present invention; and

(14) FIG. 6 is a picture for comparison of volumes between the conventional laser adjusting assembly and the laser collimating module of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(15) Referring to FIGS. 2A-6, in a preferred embodiment, a laser collimating module 20 includes a heat dissipating base 21, a laser diode chip 22, a cap 23 and a cylindrical lens 24.

(16) The heat dissipating base 21 has a fixing element 211 on a top thereof and a plurality of pins 212 at a bottom thereof.

(17) The laser diode chip 22 is disposed on the fixing element 211 of the heat dissipating base 21.

(18) The cap 23 is covering on the heat dissipating base 21 and has a placing space 231 therein and an opening 232 on a top thereof. The opening 232 is arranged above the placing space 231 and connecting thereto, correspondingly aligning with the laser diode chip 22.

(19) The cylindrical lens 24 is disposed in the placing space 231 and has a first surface 241 facing toward the laser diode chip 22 with a first minimized distance D.sub.1 arranged therebetween and a second surface 242 facing toward the opening 232 with a second minimized distance D.sub.2 arranged therebetween. In this embodiment, the cylindrical lens 24 is either cylindrical or semi-cylindrical, but the present invention is not limited to such application.

(20) Referring to FIGS. 2A-2C, the cap 23 includes a flat surface 233 on a lateral side thereof connecting to the placing space 231, forming a circular opening 234 to be filled in with an adhesive 25 for fixing a position of the cylindrical lens 24. Further referring to FIGS. 3A-4B, the first minimized distance D.sub.1 between the first surface 241 of the cylindrical lens 24 and the laser diode chip 22 and the second minimized distance D.sub.2 between the second surface of the cylindrical lens 24 and the opening 232 allow the laser collimating module 20 to be assembled with a height of 4 mm But the present invention is not limited to such application.

(21) With reference to FIGS. 5A and 5B, the laser diode chip 22 is stimulated and emits an elliptical laser beam L.sub.21 to the cylindrical lens 24, forming a light emitting angle θ.sub.2 due to the primary optics design of the present invention. As the laser beam L.sub.21 passes through the cylindrical lens 24, the light emitting angle θ.sub.2 is narrowed and the laser beam L.sub.21 is collimated to become a linear beam L.sub.22 emitted from the laser collimating module 20. In this embodiment, the cylindrical lens 24 has a radius R arranged between 0.5-1 mm for the purpose of narrowing a width W of the linear beam L.sub.22 within 2 mm. But the present invention is not limited to such application.

(22) With the structure disclosed above, a comparison chart can be concluded in the following with reference to FIG. 6.

(23) TABLE-US-00001 Whether it is Optics possible to narrow Amount of design the laser beams components Volume structure emitted therefrom Conventional More Greater Secondary No laser optics adjusting design assembly Laser Less Less Primary Yes collimating optics module design

(24) In short, the laser collimating module 20 of the present invention has a miniature volume of 4 mm-height H and a narrowed linear beam L.sub.22 of 2 mm width W, thereby solving the problems of conventional laser adjusting assembly including great volumes and impossibility of reducing the height of the assembly and the width of the laser beams emitted therefrom.