JP4805705B2 - The camera module - Google Patents

Description

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

  FIG. 4 relates to a conventional camera module, and is a partially exploded cross-sectional view. Next, the configuration of the conventional camera module will be described with reference to FIG. In addition, a lens 52 is mounted in the lens barrel 51.

  The cylindrical holder 53 has a through hole 53a provided in the center portion and a screw portion 53b provided on the inner surface of the through hole 53a. The screw portion 53b of the holder 53 includes a screw of the lens barrel 51. The part 51a is screwed.

  A plate-shaped infrared ray removal filter (IR cut filter) 54 is mounted in the holder 53, and a substrate 55 made of an insulating material is disposed so as to close a lower portion of the holder 53. Is fixed by an adhesive 56.

The image sensor 57 is fixed to the substrate 55 in the holder 53 by an adhesive, and in order to obtain a good image, the lens barrel 51 and the image sensor are screwed into the holder 53 or screwed back. The conventional camera module is formed by adjusting the distance between the frames 57 (see, for example, Patent Document 1).
US Pat. No. 6,383,101

  However, in the conventional camera module, the lens barrel 51 and the holder 53 are provided with threaded portions 51a and 53b, and the lens barrel 51 is rotated to adjust the position of the lens 52, which increases the number of manufacturing processes and costs. In addition to the increase in size, there is a problem that due to the recent demand for miniaturization, only the adhesion between the holder 53 and the substrate 55 by the adhesive 56 causes the adhesion strength between the holder 53 and the substrate 55 to be weak and peeling occurs.

  The present invention has been made in view of the situation of the prior art as described above, and an object of the present invention is to provide a camera module with high productivity, low cost, and high fixing strength.

In order to achieve the above object, the present invention provides a cylindrical holder, a lens disposed in the holder, a substrate fixed to a lower portion of the holder, and a state located in the holder. An image sensor fixed on a substrate, and the holder includes a top surface portion of a cylindrical inner periphery located on the image sensor, a protrusion projecting from the top surface portion toward the image sensor, and the top surface. A cylindrical outer peripheral portion provided on an outer side than the surface portion and extending on the substrate, the protrusion between the top surface portion and the imaging element in a state of contacting the upper surface of the imaging element; and Between the cylindrical outer peripheral portion and the substrate is fixed through an adhesive, the cylindrical inner peripheral portion of the holder is located inwardly spaced from the cylindrical outer peripheral portion, the top surface portion and the The protrusion is provided on the lower surface of the cylindrical inner peripheral portion .

  According to the present invention configured as described above, the distance between the lens and the image sensor is made constant only by setting the dimension between the lens and the protrusion due to the presence of the protrusion that does not include the adhesive contacting the image sensor. This eliminates the need for screw part formation and adjustment work, and provides a product with good productivity and low cost. If the dimensions are set, a very accurate distance between the lens and the image sensor can be obtained, and the holder is fixed between the substrate and the image sensor by an adhesive. Even if it exists, the adhesion strength between a holder and a board | substrate will become large and the thing without peeling will be obtained.

Further , according to the present invention configured as described above, since the top surface portion and the projecting portion are provided on the lower surface of the cylindrical inner peripheral portion, it is possible to suppress the spread of the adhesive and to obtain a material with good adhesion. .

  Further, according to the present invention, in the above invention, a plurality of protrusions are provided at intervals, and the top surface portion and the image sensor are fixed via an adhesive at a position away from the protrusions. It is characterized by.

  In the present invention configured as described above, the posture of the image sensor with respect to the holder is stabilized by the presence of the plurality of protrusions, and the adhesive to the lower surface of the protrusion is fixed by being fixed at a position away from the protrusion. Can be prevented, and an accurate distance can be obtained.

  Further, the present invention is characterized in that, in the above-mentioned invention, the cylindrical inner peripheral portion is formed in a square cylindrical shape, and one protrusion is provided on each of the lower surfaces of the three sides of the rectangular cylindrical shape.

  According to the present invention configured as described above, a more stable posture of the image sensor with respect to the holder can be obtained.

  Moreover, the present invention is characterized in that, in the above-described invention, a gap dimension between the top surface portion and the image sensor is set to 15 to 25 μm.

  According to the present invention configured as described above, the gap between the top surface portion and the image sensor can be made extremely small, and dust can be effectively prevented from entering the image sensor.

  According to the present invention, the distance between the lens and the image sensor can be made constant only by setting the dimension between the lens and the protrusion due to the presence of the protrusion that does not interpose the adhesive contacting the image sensor. This eliminates the need for the formation and adjustment of the part, and provides a product with good productivity and low cost, and the holder is fixed by an adhesive between the substrate and the image pickup device. Even if required, the fixing strength between the holder and the substrate is increased, and a product without peeling can be obtained.

  1 is a cross-sectional view of a main part of a camera module according to the present invention, and FIG. 2 is a cross-sectional view illustrating a fixing state of a holder and an image sensor according to the camera module of the present invention. FIG. 3 is a bottom view of the holder according to the camera module of the present invention.

  Next, the configuration of the camera module according to the present invention will be described with reference to FIGS. 1 to 3. The cylindrical holder 1 is made of a thermoplastic insulating resin, and has a through hole 2 provided in the center portion and an outer periphery. A cylindrical outer peripheral portion 3 located at the center, a cylindrical inner peripheral portion 4 provided inwardly at a distance from the cylindrical outer peripheral portion 3 and formed lower than the cylindrical outer peripheral portion 3, and the cylindrical shape A top surface portion 5 which is a lower surface of the inner peripheral portion 4, a plurality of (for example, three) protrusions 6 projecting downward from the top surface portion 5, and a step portion provided inside the cylindrical inner peripheral portion 4. 7

  Further, as shown in FIG. 3, the cylindrical inner peripheral portion 4 has a rectangular cylindrical shape, and the protrusions 6 are respectively provided on the lower surfaces of the three sides, and are separated from the protrusions 6 as will be described later. The adhesive 12 is present at the position (three shaded areas).

  In this embodiment, the top surface portion 5 and the protrusion 6 are described as being provided on the lower surface of the cylindrical inner peripheral portion 4. However, the cylindrical inner peripheral portion 4 is eliminated and the cylindrical outer peripheral portion 3 An inner surface step portion formed with a step from the lower surface may be provided, the lower surface of the inner surface step portion may be a top surface portion, and a protrusion may be provided on the lower surface of the inner surface step portion.

  The lens 8 is attached in front of the holder 1, and an infrared filter (IR cut filter) 9 made of a square glass plate is attached at the position of the step 7 in the holder 1.

  On the substrate 10 made of an insulating material, the image pickup device 11 is fixed by an adhesive or the like, and the substrate 10 is a holder that closes the lower portion of the holder 1 in a state where the image pickup device 11 is disposed in the holder 1. 1 is attached.

  Then, the attachment of the holder 1 to the substrate 10 and the image pickup device 11 will be described. First, the adhesive 12 is provided in an annular shape on the substrate 10 facing the lower surface of the cylindrical outer peripheral portion 3, and the cylindrical inner peripheral portion. For example, three adhesives 12 are provided on the upper surface of the imaging element 11 facing the lower surface (the top surface portion 5) away from the four protrusions 6.

  Next, in a state where the protrusion 6 of the holder 1 is in contact with the upper surface of the image sensor 11, the space between the top surface portion 5 and the upper surface of the image sensor 11, and the lower surface of the cylindrical outer peripheral portion 3 and the upper surface of the substrate 10. The space between the top surface 5 and the image sensor 11 is 15 to 25 μm when the protrusion 6 comes into contact with the upper surface of the image sensor 11. Accordingly, the spread of the adhesive 12 provided on the image sensor 11 is suppressed, and dust or the like can be prevented from entering the image sensor 11 side.

It is principal part sectional drawing which concerns on the camera module of this invention. It is sectional drawing which concerns on the camera module of this invention, and shows the adhering state of a holder and an image pick-up element. It is a bottom view of the holder concerning the camera module of the present invention. It is sectional drawing which concerns on the conventional camera module, and decomposed | disassembled one part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holder 2 Through-hole 3 Cylindrical outer peripheral part 4 Cylindrical inner peripheral part 5 Top surface part 6 Projection part 7 Step part 8 Lens 9 Infrared removal filter 10 Substrate 11 Imaging element 12 Adhesive

Claims (4)

A cylindrical holder, a lens disposed in the holder, a substrate fixed to a lower portion of the holder, and an imaging element fixed on the substrate in a state of being positioned in the holder, The holder is provided on the top surface portion of the cylindrical inner peripheral portion located on the image pickup device, a protrusion protruding from the top surface portion toward the image pickup device, and outside the top surface portion, and extends on the substrate. An adhesive is provided between the top surface portion and the imaging element and between the cylindrical outer periphery portion and the substrate in a state having a cylindrical outer peripheral portion and the protrusion contacting the upper surface of the imaging device. It is fixed through the,
The cylindrical inner peripheral portion of the holder is located inwardly at a distance from the cylindrical outer peripheral portion, and the top surface portion and the protrusion are provided on the lower surface of the cylindrical inner peripheral portion. Camera module. A plurality of the protrusions are provided at intervals, and the top surface part and the imaging element are fixed to each other with the adhesive at a position away from the protrusions. Item 1. The camera module according to Item 1 . The cylindrical inner peripheral portion is formed in a square tube shape, the camera module according to claim 1 or 2, wherein said projections are provided one each on the lower surface of the rectangular tubular three sides. The camera module according to any one of claims 1 to 3 , wherein a gap dimension between the top surface portion and the imaging device is set to 15 to 25 µm.

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