JP2007047590A - Camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera module capable of stably holding a holder and preventing center displacement of a lens. <P>SOLUTION: In the camera module, a first thread part 3 is formed on either the holder 2 or a holding member 4 and a second thread part 6 is formed on the other, such that the flat faces of the tops of the upper edges 3a of the first thread part 3 are slidably disposed in contact with the corresponding flat faces of the bottoms of the lower edges 6b of the second thread part 6. This prevents movement of the holder 2 in a lateral direction (i.e., in the direction of arrow A2), and hence center displacement of the holder 2 from an imaging element 8. In addition, engaging of the flat faces of the upper ridges and lower ridges of the threads minimizes movement of the holder 2 in a vertical direction (i.e., in the direction of arrow A1) relative to the holder member 4. Accordingly, the holder 2 is stably held. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera module suitable for application to a mobile phone or the like.

  FIG. 3 is a cross-sectional view of a main part of a conventional camera module, and FIG. 4 is an explanatory view showing a meshed state of a male screw and a female screw according to the conventional camera module. The configuration of the camera module will be described with reference to FIGS. 3 and 4. A male screw 53 is provided on the outer peripheral portion of a cylindrical holder 52 in which a lens 51 is held. A thread 53a having a shape and a trapezoidal trough 53b located between the threads 53a are provided.

  The holding member 54 that holds the holder 52 includes a cylindrical portion 55 and a female screw 56 provided in the cylindrical portion 55. The female screw 56 includes a screw thread 56a having a trapezoidal cross section, and a screw. While having the trapezoidal trough part 56b located between the peaks 56a, the male screw 53 of the holder 52 is screwed into the female screw 56 of the holding member 54, and the holder 52 is attached to the holding member 54.

As shown in FIG. 4, the male screw 53 and the female screw 56 are formed with trapezoidal screw threads 53a and 56a and trapezoidal valley portions 53b and 56b with a clearance from each other to facilitate screwing. The space between the top of the thread 53a and the bottom of the trough 56b and the bottom of the trough 53b and the top of the thread 56a are spaced from each other. For this reason, when the male screw 53 is screwed into the female screw 56, the upper side surface of the screw thread 53a is screwed in sliding contact with the lower side surface of the screw thread 56a. A gap S4 is formed between the upper surface of the screw thread 56a, and the holder 52 moves up and down (backlash in the direction of the arrow A1) within the range of the gap S4, and the top part of the screw thread 53a and the bottom part of the valley part 56b. Between the bottom of the trough 53b and the top of the thread 56a (gap S5), the holder 52 moves in the lateral direction within the range of the gap S5 (arrow (Rattle in the A2 direction). Then, the circuit board 58 to which the image sensor 57 is attached is attached to the lower part of the holding member 54 to form a conventional camera module (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-32525 (2nd to 3rd pages, FIGS. 2 and 4)

  However, in the conventional camera module, the male screw 53 and the female screw 56 are engaged with each other with a vertical gap S4 and a horizontal gap S5, so that the holder 52 has a large play in the vertical and horizontal directions. As a result, there is a problem that the holder 52 cannot be stably held, and the backlash in the lateral direction of the holder 52 becomes a center defect of the lens 51 with respect to the image sensor 57 and becomes a serious drawback.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to provide a camera module in which the holding of the holder is stable and the center deviation of the lens can be prevented.

  In order to achieve the above object, as a first solving means of the present invention, a lens, a cylindrical holder that holds the lens inside and is provided with a threaded portion on the outer peripheral surface, and meshes with the threaded portion. A cylindrical holding member provided on an inner peripheral surface, and one of the holder and the holding member is provided with the first screw part, and the holder and the holding member Either one is provided with a second threaded portion that meshes with the first threaded portion, and the first threaded portion is formed with a flat top surface of a thread, and the second threaded portion. The bottom of the trough located between the threads is formed on a flat surface, and the top of the thread of the first thread and the bottom of the trough of the second thread are in sliding contact with each other It was.

  Further, as a second solving means, the thread of the second threaded portion has a triangular or trapezoidal cross section, and the side surface of the threaded thread of the second threaded portion and the first threaded portion It was set as the structure which provided the clearance gap between the side surfaces of the screw thread.

  As a third solution, a gap is provided between the top of the thread of the second screw portion and the bottom of the valley located between the threads of the first screw portion.

  As a fourth solution, an adhesive is provided in the gap, and the holder and the holding member are bonded.

  In the camera module of the present invention, either the holder or the holding member is provided with the first screw portion, and the other is provided with the second screw portion, which is positioned at the top of the screw thread of the first screw portion. Since the flat surface to be slidably contacted with the flat surface located at the bottom of the valley portion of the second screw portion, movement of the holder in the lateral direction (arrow A2 direction) can be prevented, and the center of the holder with respect to the image sensor In addition to preventing displacement, the vertical movement of the holder relative to the holding member (in the direction of the arrow A1) can be suppressed as much as possible by meshing the flat surfaces of the top and valley of the thread, so that the holder can be held stably. Things are obtained.

  In addition, the thread of the second threaded portion has a triangular or trapezoidal cross section, and a gap is formed between the side surface of the threaded thread of the second threaded portion and the side surface of the threaded thread of the first threaded portion. Since it is provided, friction during the screwing operation is reduced, screwing is facilitated, and a reliable filling of the adhesive into the gap is obtained.

  In addition, since a gap is provided between the top of the thread of the second screw portion and the bottom of the valley located between the threads of the first screw portion, the friction during the screwing operation is further reduced, and screwing is reduced. In addition to being easy, it is possible to obtain a reliable filling of the adhesive into the gap.

  Further, since the adhesive is provided in the gap and the holder and the holding member are bonded, the holder and the holding member are securely fixed, and there is no backlash of the holder, so that a highly accurate one can be obtained.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a main part according to a first embodiment of the camera module of the present invention, and FIG. FIG. 1 is a sectional view of a part of the camera module according to the first embodiment of the present invention. Referring to FIG. 1, a cylindrical holder 2 with a lens 1 held therein is a cylindrical part 2a. And a projecting piece 2b provided to project from the upper portion of the cylindrical portion 2a and screwed therein, and a first screw portion (male screw) 3 provided on the outer peripheral surface (outer peripheral portion) of the cylindrical portion 2a. . The first screw portion 3 has a top portion formed on a flat surface, and has a screw thread 3a having a square cross section and a valley portion 3b positioned between the screw threads 3a. That is, the first screw portion 3 that is a male screw has a flat top surface of the thread 3a.

  The holding member 4 that holds the holder 2 includes a cylindrical portion 5 and a second screw portion (female screw) 6 provided on an inner peripheral surface (inner peripheral portion) in the cylindrical portion 5. The second threaded portion 6 includes a thread 6a having a trapezoidal cross section and a valley 6b located between the threads 6a and having a bottom formed on a flat surface. That is, the second screw portion 6 that is a female screw has a flat bottom surface of the valley portion 6b.

  Then, the first screw portion 3 of the holder 2 is screwed into the second screw portion 6 of the holding member 4, and the holder 2 is attached to the holding member 4. By rotating 2b, the flat top portion of the thread 3a of the first screw portion 3 enters while being in sliding contact with the flat bottom portion of the trough portion 6b of the second screw portion 6. Is completed, a gap S1 exists between the upper and lower side surfaces of the screw thread 3a of the first screw portion 3 and the upper and lower side surfaces of the screw thread 6 of the second screw portion 6, and the first screw A gap S <b> 2 exists between the bottom of the valley portion 3 b of the portion 3 and the top of the thread 6 a of the second screw portion 6. Therefore, at the time of screwing, only the portion between the top of the thread 3 of the first screw 3 and the bottom of the valley 6b of the second screw 6 is prevented from sliding. Here, the first screw portion 3 is provided on the holder 2 and the second screw portion 6 is provided on the holding member 4. However, the first screw portion 3 is provided on the holding member 4. The second screw portion 6 may be provided on the holder 2.

  In addition, an infrared removing filter (IR cut filter) 7 is disposed in the lower part of the holding member 4, and a circuit board 9 to which the image sensor 8 is attached is attached to the lower part of the holding member 4. Then, after the holder 2 to which the lens 1 is attached is screwed into the holding member 3 and the adjustment of the focal length between the lens 1 and the imaging element 8 is completed, the adhesive 10 is filled in the gaps S1 and S2, and the holder 2 When the holding member 4 is bonded, the camera module of the present invention is formed. When the adhesive 10 is filled, the presence of the gap S1 and / or S2 allows the adhesive 10 to flow between the first and second screw portions 3 and 6, and the holder 2 and Adhesion between the holding members 4 can be ensured.

  FIG. 2 shows a second embodiment of the camera module according to the present invention. The second embodiment will be described. The second screw portion 6 has a thread 6a having a triangular cross section and a second screw. The configuration of the portion 6 is simplified, and the other configurations are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals, and the description thereof is omitted here.

It is principal part sectional drawing which concerns on 1st Example of the camera module of this invention. It is principal part sectional drawing which concerns on 2nd Example of the camera module of this invention. It is principal part sectional drawing concerning the conventional camera module. It is explanatory drawing which shows the meshing state of the external thread and internal thread which concern on the conventional camera module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens 2 Holder 2a Cylindrical part 2b Projection piece 3 1st thread part (male thread)
3a Thread 3b Valley 4 Holding member 5 Cylindrical part 6 Second thread part (female thread)
6a Thread 6b Valley 7 Infrared filter 8 Image sensor 9 Circuit board S1, S2 Gap

Claims (4)

A lens, a cylindrical holder that holds the lens inside and has a threaded portion on the outer peripheral surface, and a cylindrical holding member that has a threaded portion that meshes with the threaded portion on the inner peripheral surface; One of the holder and the holding member is provided with the first screw portion, and the other of the holder and the holding member is the second screw that meshes with the first screw portion. A first threaded portion is formed on the flat surface of the top of the thread, and the second threaded portion is formed on the flat surface of the bottom of the valley located between the threads, A camera module, wherein the top of the thread of the first screw portion and the bottom of the valley of the second screw portion are in sliding contact with each other. The thread of the second threaded portion has a triangular or trapezoidal cross section, and a gap is formed between the side surface of the threaded thread of the second threaded portion and the side surface of the threaded thread of the first threaded portion. The camera module according to claim 1, further comprising: 3. The camera module according to claim 2, wherein a gap is provided between the top of the thread of the second threaded portion and the bottom of the valley located between the threads of the first threaded portion. The camera module according to claim 2, wherein an adhesive is provided in the gap so that the holder and the holding member are bonded to each other.

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