TWI407175B - Device and method for center aligning - Google Patents

Abstract

A center aligning device includes a positioning board a light source with a emitting portion and a reflection body. The light source is embedded in the positioning board. The emitting portion emits a light beam perpendicular to the positioning board. The reflection body is a solid or hollow right circular cone and the apex angle of the reflection body is 90 degree. The central axis of reflection body is perpendicular to the positioning board. The side surface of the reflection body is a reflecting surface, which is used for reflecting the light beam back to the positioning board. A center-aligning method using the center-aligning device is also provided.

Description

Center alignment fixture and center alignment method

The present invention relates to a center alignment jig and a center alignment method applied to a lens assembly device.

With the development of camera technology, the lens module has been widely used in various types of camera devices. The combination of lens modules and various portable electronic devices such as mobile phones, video cameras, computers, etc., has been favored by many consumers. The assembly process of the lens module generally consists of first assembling an optical lens into the lens barrel and then screwing the lens barrel into the lens holder.

When assembling, the lens barrel is placed on the assembly platform, and the central axis of the lens barrel is aligned with the assembly center of the assembly platform, and then the optical lens or the like is sucked into the lens barrel by using a suction device such as a suction nozzle, the lens barrel and the optical lens. When the components are assembled in the assembly center, the central axis coincides with a slight deviation, and the image quality of the assembled lens module will be affected. Alpheus W. Burner et al. 1995 SPIE System Image Metrology The paper published in the fourth conference (Videometrics IV) zoom lens calibration for wind tunnel measurements reveals the effect on imaging due to the misalignment of the optical axes of the lenses in the lens module. Therefore, the alignment of the central axis of the nozzle with the assembly center becomes particularly important.

In view of the above, it is necessary to provide a center alignment jig and center alignment method that can better align the center axis of the nozzle with the assembly center.

A center alignment fixture for aligning a nozzle center axis of a lens module assembly machine with an assembly center of an assembly platform, comprising a positioning plate, a light generator and a reflector; the light generator is embedded The light generator is disposed in the positioning plate, and the light generator has a light emitting portion for emitting light perpendicular to the surface of the positioning plate; the reflector is a solid positive cone or a hollow positive cone having a 90 degree apex angle, the reflection The central axis of the body is perpendicular to the surface of the positioning plate adjacent to the reflector, and the side of the reflector is a reflecting surface for reflecting the light emitted by the light generator back to the surface of the positioning plate.

A center alignment method using the center alignment jig for realizing alignment of a nozzle of an assembly of a lens module assembly machine with an assembly center of an assembly platform, comprising the steps of: the nozzle adsorbing the reflector, so that the The apex of the reflector is opposite to the nozzle, and the central axis of the reflector coincides with the central axis of the nozzle; the positioning plate is positioned on the surface of the assembly platform such that the illuminating portion is opposite to the assembly center; the ray generator emits light, The light is emitted to the reflector in a direction perpendicular to the surface of the positioning plate, and reflected by the reflector returns to the surface of the positioning plate to form a light spot; the nozzle is moved until the light reflected by the reflector forms The light spot on the positioning plate coincides with the light emitting portion.

The center is aligned with the fixture by the positioning plate and the assembly platform, and the light generator cooperates with the reflector. When the light reflected by the reflector is coincident with the light portion at the spot formed by the positioning plate, the light is reflected. The apex of the body is post-reflected, at which point the central axis of the nozzle is precisely aligned with the assembly center of the assembly platform.

The invention will now be described in further detail with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, a first embodiment of the present invention provides a center alignment jig 100. The center alignment jig 100 includes a reflector 10, a positioning plate 12, and a light generator 14 for assembling the center axis 302 of the nozzle 30 and the assembly surface of the assembly platform 20. 202 alignment.

The reflector 10 is a solid ortho-conical body having a vertex angle of 90 degrees, which is generally a light-weight polymer material such as an acrylic resin, a polycarbonate resin or a polyethylene resin. The inner side surface 102 of the reflector 10 is a reflecting surface for reflecting the light emitted by the light generator 14.

The surface of the positioning plate 12 defines an opening 126. The light generator 14 is embedded in the positioning plate 12. The light generator 14 of the embodiment is a laser generator, and the light generator 14 has a light emitting portion 142. The light emitting portion 142 is opposite to the opening 126. The light emitted from the light emitting portion 142 is emitted from the positioning plate 12 through the circular opening 126. The diameter of the opening 126 is preferably less than 1 mm. Of course, the shape of the opening 126 is not limited to a circular shape. The other surface 124 of the positioning plate 12 has a positioning protrusion 128. The position of the positioning protrusion 128 on the surface 124 of the positioning plate 12 is opposite to the position of the light-emitting portion 142 of the surface 122. The positioning protrusion 128 of the embodiment is a conical protrusion.

The positioning plate 12 is disposed on the surface of the assembly platform 20 when in use. The surface of the assembly platform 20 is provided with a conical positioning recess 204 that cooperates with the positioning protrusion 128. The apex of the positioning recess 204 coincides with the assembly center 202. The cooperation of the 204 with the locating projection 128 aligns the assembly center 202 with the position of the illuminating portion 142. It can be understood that the positioning of the positioning plate 12 and the assembly platform 20 can be other forms, as long as the opening 126 can be opposite to the position of the assembly center 202, and is not limited to the positioning protrusion 128 and the positioning recess 204 of the embodiment. Cooperation.

Referring to FIG. 3 together, the center alignment method using the center alignment jig 100 includes the following steps: 1) adsorbing the reflector 10 by the suction nozzle 30, so that the apex of the reflector 10 is opposite to the suction nozzle 10, and the nozzle The central axis 302 of the 10 is perpendicular to the surface of the positioning plate 12, and the bottom surface 104 of the reflector 10 is opposite and parallel to the surface 122 of the positioning plate 12; the positioning plate 12 is disposed on the surface of the assembly platform 20 and the positioning protrusion 128 is positioned The recess 204 cooperates such that the light emitting portion 142 is opposite the position of the assembly center 202 of the assembly platform 20. The diameter of the bottom surface 104 of the reflector 10 is larger than the diameter of the opening of the nozzle 30, so that the reflector 10 can be fixed to the opening of the nozzle 30, since the reflector 10 is a positive cone, so that the central axis of the reflector 10 It coincides with the central axis of the nozzle 30.

2) The light generator 14 emits light 144 from the opening 126 which is perpendicular to the surface 122 of the positioning plate 12. Since the bottom surface 104 of the reflector 10 is parallel to the surface of the positioning plate 12, the light ray 144 vertically passes through the reflector. The bottom surface 104 of the 10 enters the reflector 10, is reflected twice by the inner side surface 102 of the reflector 10, and returns to the surface 122 of the positioning plate 12. Since the apex angle of the reflector 10 is 90 degrees, the light after the secondary reflection of the light ray 144 is still perpendicular to the surface 122 of the positioning plate 12. Referring to FIG. 3, the surface 122 of the positioning plate 12 is provided with a plurality of X, -Y coordinate tick marks 130 originating from the center of the opening 126, and the light 144 is reflected back to the surface 122 of the positioning plate 12 to form a light spot (Fig. Not shown), the distance between the position coordinate of the light spot and the opening 126 can be seen from the tick mark 130. According to the position of the light spot, the direction and distance of the suction nozzle 10 need to be moved, for example, when the coordinates of the light spot are (2) 2), the nozzle 10 also needs to move 2 units in the negative direction of the X-axis and 2 units in the negative direction of the Y-axis.

3) moving the nozzle 30 until the light spot 144 is reflected back to the surface 122 of the positioning plate 12 by the reflector 10 and coincides with the position of the opening 126, that is, the light 144 is reflected by the apex of the reflector 10, and the nozzle 30 is at this time. The central axis 302 is aligned with the assembly center 202 of the surface of the assembly platform 20, i.e., the nozzle 30 is aligned with the center of the assembly center 202. The position coordinates of the nozzle 30 are recorded, and when the lens module is assembled, the nozzle 30 can be controlled to move to the recorded coordinate position and then moved downward for assembly.

Compared with the prior art, the center-aligning jig 100 of the present embodiment adopts a positive-cone reflector 10 with a apex angle of 90 degrees and the light generator 14 to match the assembly center of the nozzle 30 and the assembly platform 20. 202 is centered so that the nozzle 30 can accurately position the optical elements adsorbed thereon during assembly so that the optical axes of the respective optical elements coincide with each other.

Referring to FIG. 4, a second embodiment of the present invention provides a center alignment jig 200. The center alignment jig 200 is substantially the same as the center alignment jig 100 of the first embodiment, except that the center alignment jig 200 is used to reflect the light source 14 to emit light. The conical cylinder, that is, a hollow positive conical structure, has an axial cross-sectional apex angle of 90 degrees on the inner conical surface of the reflector 22. The center alignment method using the center alignment jig 200 is similar to the center alignment method using the center alignment jig 100, and will not be described herein.

Referring to FIG. 5, a third embodiment of the present invention provides a center alignment jig 300. The center alignment jig 300 is substantially the same as the center alignment jig 100 of the first embodiment, except that the light generator 34 of the center alignment jig 300 has a light emitting portion 342, and the surface 322 of the positioning plate 21 There is an opening 326 through which the light emitting portion 342 passes, preferably having a diameter of less than 1 mm.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Positioning plate. . . 12,21

surface. . . 122,124,322

Light generator. . . 14,34

Opening. . . 126,326

Reflector. . . 10,22

Positioning bulge. . . 128

Nozzle. . . 30

Tick. . . 130

Assembly platform. . . 20

Light department. . . 142,342

Center alignment fixture. . . 100,200,300

Light. . . 144

Inner side. . . 102

Assembly center. . . 202

Bottom surface. . . 104

Positioning depression. . . 204

The central axis. . . 302

1 is a perspective view of a center alignment jig of a first embodiment of the present invention.

2 is a plan view showing the alignment of the center alignment jig of FIG. 1 with the nozzle and the assembly platform.

3 is a plan view showing the positioning plate of the center alignment jig in FIG.

4 is a schematic cross-sectional view showing a center alignment jig of a second embodiment of the present invention.

Figure 5 is a schematic cross-sectional view showing a center alignment jig of a third embodiment of the present invention.

Positioning plate. . . 12

Light department. . . 142

Light generator. . . 14

Light. . . 144

Reflector. . . 10

Assembly platform. . . 20

Inner side. . . 102

Assembly center. . . 202

Bottom surface. . . 104

Positioning depression. . . 204

surface. . . 122

Nozzle. . . 30

Opening. . . 126

The central axis. . . 302

Positioning bulge. . . 128

surface. . . 322

Claims (9)

A center alignment jig for aligning the center axis of the nozzle of the lens module assembly machine with the assembly center of the assembly platform, comprising: a positioning plate; a light generator embedded in the positioning plate The light generator has a light emitting portion for emitting light perpendicular to the surface of the positioning plate; and a reflector is a solid positive cone or a hollow positive cone having a 90 degree apex angle, and the central axis of the reflector is vertical The side of the reflector is adjacent to the surface of the reflector, and the side of the reflector is a reflective surface for reflecting light from the light generator back to the surface of the positioning plate. The center alignment jig according to claim 1, wherein the light generator is a laser generator. The center alignment jig according to claim 1, wherein the material of the reflector is selected from one of an acrylic resin, a polycarbonate resin, and a polyethylene resin. The center alignment jig according to the first aspect of the invention, wherein the surface of the positioning plate adjacent to the reflector is provided with an opening, and the position of the light emitting portion is opposite to the position of the opening. The center alignment jig of claim 1, wherein the opening has a diameter of less than 1 mm. The center alignment jig of claim 4, wherein the positioning plate is disposed away from the surface of the opening with a positioning protrusion, and the positioning protrusion is located opposite to the position of the light emitting part. The center alignment jig according to claim 6, wherein the positioning protrusion has a shape of a cone. The center alignment jig according to claim 4, wherein the surface of the opening of the positioning plate is provided with a coordinate mark. A center alignment method using the center alignment jig according to claim 1 for realizing the alignment of the nozzle of the lens module assembly machine with the assembly center of the assembly platform, comprising the following steps: The nozzle adsorbs the reflector such that the apex of the reflector is opposite to the nozzle, and the central axis of the reflector coincides with the central axis of the nozzle; the positioning plate is positioned on the surface of the assembly platform such that the light emitting portion is opposite to the assembly center The light generator emits light, and the light is emitted to the reflector in a direction perpendicular to the surface of the positioning plate, and is reflected by the reflector and returned to the surface of the positioning plate to form a spot; the nozzle is moved until the The light reflected by the reflector is formed on the positioning plate and the light spot overlaps with the light emitting portion.