Auto focusing module, photographing apparatus including the same, and method of manufacturing auto focusing module

Patent metadata

Field	Value
Publication number	US-9915801-B2
Application number	US-201615006483-A
Country	US
Kind code	B2
Filing date	Jan 26, 2016
Priority date	Jan 27, 2015
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

An auto focusing (AF) module includes a fixed base, an AF barrel configured to support a focus lens, an AF base supported by the fixed base and configured to support the AF barrel such that the AF barrel that moves along an optical axis. A stepper motor is fixed to the AF base and provides a driving force to the AF barrel; a bonding member is arranged between the fixed base and the AF base, the bonding member being configured to bond the fixed base and the AF base to each other. The AF module may fix the AF base in an optimum location with respect to the fixed base, so that the assembling error of a first guide shaft assembled in the AF base may be compensated. The AF module may be fixed to the optimum location with respect to another component, such as the lens frame.

First claim

What is claimed is:

1. An auto focusing (AF) module comprising:
a focus lens;
an AF barrel including a structure configured to support a focus lens;
a fixed base;

an AF base supported by the fixed base, and having a structure that supports the AF barrel to permit movement of the AF barrel along an optical axis;
a stepper motor unit fixed to the AF base that provides a driving force to the AF barrel for movement along the optical axis;
a bonding member arranged between the fixed base and the AF base to bond the fixed base and the AF base to each other; and
at least one first guide shaft assembled in the AF base to guide movement of the AF barrel along the optical axis,
wherein the at least one first guide shaft and the AF base are constructed of different materials from each other.

2. The AF module of claim 1 , wherein the AF base includes an AF body having a via hole, through which a portion of the AF barrel penetrates, and a plurality of guide shafts fixed to the AF body and arranged in parallel to a direction of the optical axis.

3. The AF module of claim 1 , wherein the bonding member comprises an ultraviolet bonding agent cured by ultraviolet rays.

4. The AF module of claim 1 , further includes at least one second guide shaft extending from the AF base.

5. The AF module of claim 4 , wherein the AF base and the at least one second guide shaft are constructed of a same material.

6. The AF module of claim 1 , wherein the fixed base includes at least one detachment prevention part that prevents the AF base from being detached from the fixed base, and the AF base is arranged apart from the detachment prevention part by a predetermined distance.

7. The AF module of claim 1 , further comprising a holder unit fixed to the AF base.

8. The AF module of claim 1 , wherein the stepper motor unit comprises a stepper motor, and a lead screw configured to be rotated by the stepper motor.

9. The AF module of claim 8 , wherein the stepper motor unit further comprises a pressurizing member coupled to the lead screw, and the AF barrel further comprises a lead screw insertion part inserted into the lead screw.

10. A photographing apparatus comprising a lens unit including the auto focusing (AF) module of claim 1 , and a main body including a lens mounting module, an image sensor and an aperture.

11. A method of manufacturing an auto focusing (AF) module, the method comprising:
assembling at least one first guide shaft in an AF base to guide movement of an AF barrel along an optical axis, wherein the at least one first guide shaft and the AF base are constructed of different materials from each other;
assembling in a fixed base the AF base configured to support the AF barrel such that the AF barrel that is movable along the optical axis, wherein the AF barrel is configured to support a focus lens;
injecting an uncured bonding member between the AF base and the fixed base;
adjusting a location of the AF base with respect to the fixed base; and
curing the bonding member.

12. The method according to claim 11 , further comprising providing an actuator for driving the focus lens along the optical axis.

13. The method according to claim 12 , further comprising configuring the AF module to be supported by a lens frame.

14. The method of claim 11 , wherein the adjusting of the location of the AF base comprises adjusting the location of the AF base in real time, based on a resolution of an image corresponding to incident light transmitted through the focus lens.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kang Yoon-Seok

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N5/2254

  Electricity · mapped topic

• G02B7/04 Primary

  with mechanism for focusing or varying magnification · CPC title

• G03B3/10 Primary

  Power-operated focusing · CPC title

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title