JP5274881B2 - Imaging lens module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens unit capable of soldering processing in a reflow oven, in such a state that all components are incorporated in a holder and packaged. <P>SOLUTION: The fitting parts 5 and 6 of a first lens 2 and a second lens 3 are fitted to each other and further, the fitting parts 9 and 10 of the second lens 3 and a lens pressing frame 8 are fitted to each other, to insert, fix and hold the first lens 2 and the second lens 3 between a flange part 7 and the lens pressing frame 8. A lens barrel 15 is fastened to a holder 40 and the focusing of the lens unit 4 is performed. After that, a substrate 30 is incorporated in the holder 40, to be assembled as an imaging module 1 and then, the soldering processing of the substrate 30 is performed in a reflow soldering oven. The thermal expansion of the first lens 2 and the second lens 3 caused by heating for soldering is absorbed by elastically deforming the lens barrel 15, so that the first lens 2 and the second lens 3 never strongly butt against the inner circumferential surface of the lens barrel 15. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to an image pickup lens module using a digital camera or a mobile camera or the like mounted in a mobile phone, in particular, when packaging as IMAGING lens module relates to the assembly easy imaging lens module.

  In recent years, many photographing functions have been added for mobile phones, and the lens unit mounted on this type of mobile phone's caramel has a plurality of lenses stacked in the optical axis direction in the lens barrel to accommodate high pixels. A structure using a combined lens unit is common.

  By the way, the lens barrel incorporating the lens unit composed of a plurality of lenses in this manner is assembled to the holder, and the substrate on which the holder and the image sensor are mounted is assembled and finally packaged as a small imaging module. It is important that the optical axes of a plurality of lenses constituting the lens unit are positioned and held by the lens barrel without being inclined with respect to the light receiving surface of the image sensor. As a technique for aligning each lens in the optical axis direction and incorporating it into the lens barrel, for example, Patent Document 1 discloses a plurality of lenses having different outer diameters and a lens holding portion having a size corresponding to each lens diameter in a stepped shape. A lens barrel device for a lens unit has been proposed in which each lens is incorporated in the lens barrel in order according to the lens diameter. Further, in Patent Document 2, a conical tapered surface that is fitted to each other on the overlapping surface of a plurality of lenses is formed, and the tapered surfaces are fitted to each other so as to align the optical axis direction between the lenses. A method for positioning and fixing the lens is proposed.

  In the lens units proposed in Patent Document 1 and Patent Document 2, since the outer peripheral surface of each lens is fitted into the inner peripheral surface of the lens barrel, alignment between the lenses in the optical axis direction is performed. If there is a gap between each lens on the inner peripheral surface of the cylinder, each lens will move in the radial direction, resulting in eccentricity between the lenses. In the lens unit, the inner diameter of the lens barrel and the outer diameter of each lens are dimensionally controlled with high accuracy so that no gap is formed between the inner peripheral surface of the lens barrel and each lens.

JP 2002-82272 A JP 2006-284788 A

  By the way, the board | substrate used for a small imaging module mounts many electronic components containing an image pick-up element, and the lead terminal of an electronic component is electrically connected to the conductive pattern formed in the board | substrate by soldering. As a method of soldering the electronic component, it is common to solder the electronic component to the substrate by reflow soldering for the purpose of improving production efficiency by automation. When soldering various electronic components to the board with reflow solder, the electronic parts are transported to the reflow furnace with the electronic components mounted on the board, and the solder is melted by circulating the heating gas in the reflow furnace to solder the electronic parts. Attach. Therefore, in the lens units proposed in Patent Document 1 and Patent Document 2, reflow is performed in a state where a lens barrel in which the lens unit is incorporated and a substrate on which an imaging element is mounted are assembled in a holder and packaged as a small imaging module. It is impossible to solder various electronic components to the board with solder.

  That is, in the conventional small imaging module, a plastic lens that can be easily molded as a material of each lens, and a holder that incorporates a lens barrel that incorporates a lens unit and a substrate that mounts a large number of electronic components including an imaging element, etc. Molded with a synthetic resin different from the lens unit. For this reason, when soldering in a reflow furnace, the lens unit thermally expands and interferes with the lens barrel due to a difference in thermal expansion coefficient between the lens unit and the lens barrel. In other words, as described above, each lens fitted in the inner peripheral surface of the lens barrel is dimensionally controlled with high accuracy so that no gap is generated between the lens barrel and the inner peripheral surface. Since there is no room for thermal expansion in the radial direction inside the lens unit, when the lens unit is thermally expanded and interferes with the lens barrel and the lens unit is strongly pressed against the inner peripheral surface of the lens barrel, deformation and stress occur in the lens. The performance of the lens and the assembly accuracy are significantly reduced. As a result, the focal length between each lens and the image sensor is also distorted, and the optical performance cannot be ensured.

  Therefore, in the past, after mounting only the board with various electronic components assembled to the holder and soldering in the reflow furnace, the lens barrel with the lens assembled is screwed into the holder to adjust the screwing amount of the lens barrel Thus, the focal length between the lens and the image sensor is adjusted, and finally the lens barrel and the holder are bonded and fixed, and finally packaged as a small image pickup module. In such a work process, since the lens barrel is retrofitted, the assembly work to the holder cannot be performed continuously, and thus there is a problem that improvement in efficiency cannot be expected.

The present invention has been made in view of the above problems, and provides an imaging lens module that can be soldered in a reflow furnace while all components are assembled and packaged in a holder. With the goal.

The present invention is to retract the lens unit obtained by superimposing a plurality of lenses in the optical axis direction in a cylindrical lens barrel, an imaging lens for receiving and positioning the respective lenses in the radial direction in the cylindrical lens barrel In the module , the lens barrel is formed of a synthetic rubber material having flexibility and heat resistance.

According to the imaging lens module of the present invention, even if the lens unit accommodated in the lens barrel is thermally expanded, the lens barrel made of a synthetic rubber material having flexibility is elastically deformed to prevent thermal expansion of the lens unit. The lens unit does not excessively hit the lens barrel and interfere with it.

The imaging lens module of the present invention forms conical fitting portions centered on the optical axis and positioned on the overlapping surface of the lenses as positioning means for the plurality of lenses, and the taper of the fitting portions A pair of lens pressers for holding and holding each of the lenses is provided, and at least one of the lens pressers is positioned on an overlapping surface with the lens. And forming conical fitting portions around the optical axis, and fitting the tapered surfaces of the fitting portions to position and hold the lenses in the radial direction with respect to the lens barrel. It is characterized by comprising.

According to the imaging lens module of the present invention, by fitting the tapered surfaces of the fitting portions formed on the respective lenses, the optical axes of the respective lenses are accommodated in the lens barrel so as to match each other. By fitting the fitting portions formed on the overlapping surfaces, the lenses are positioned and held in the lens barrel in a state where the optical axes of the lenses coincide with the axis of the lens barrel.

The imaging lens module according to the present invention includes a lens presser frame in which one of the lens pressers is formed by a flange portion formed in the lens barrel, and the other lens presser is slidably fitted into the inner peripheral surface of the lens barrel. A plurality of lenses constituting the lens unit and the lens pressing frame are sequentially inserted into the lens barrel so that the preceding lens is brought into contact with the flange portion, and the lens pressing frame is pressed against the rearmost lens. The lens holding frame and the lens barrel are fixed integrally after the lenses are positioned and held in the radial direction with respect to the lens barrel.

According to the imaging lens module of the present invention, by inserting a plurality of lenses into the lens barrel and fitting the tapered surfaces of the fitting portions formed on the lenses, the optical axes of the lenses are aligned with each other. It is stored in the lens barrel. After that, when the lens holding frame is inserted into the lens barrel, the lens and the tapered surface of the fitting portion formed on the lens holding frame are fitted, and the optical axis of each lens is aligned with the axis of the lens barrel. In addition, the lens unit is sandwiched and held between the flange portion formed on the lens barrel and the lens pressing frame.

The imaging lens module of the present invention includes a holder that is assembled to the lens barrel and a substrate on which the imaging element is mounted, and an internal thread portion is formed on the inner peripheral surface of the holder, and the outer periphery of the lens barrel is formed on the female thread portion. After screwing the male screw part formed on the surface, and adjusting the position of the lens unit assembled in the lens barrel in the optical axis direction according to the screwing amount, and focusing the lens unit with respect to the imaging device, integrating the said holder and the lens barrel, and reflow soldering of electronic components to be mounted on the substrate in the packaged state as an imaging lens module by assembling the substrate for mounting the lens barrel and the image sensor in the holder A process is performed.

According to the imaging lens module of the present invention, a compact imaging module is assembled by assembling the lens barrel and the substrate on which the imaging element is mounted to the holder, and the lens barrel is assembled in the lens barrel according to the screwing amount of the lens barrel screwed to the holder. The focal length of the image pickup element and the lens unit is adjusted by adjusting the position of the lens unit in the optical axis direction. Then, conveys the IMAGING lens module in a reflow soldering furnace, performing soldering of the imaging device and various electronic components have been assembled on the substrate. At this time, even if the lens unit is thermally expanded by heating by the soldering process, the lens barrel made of a synthetic rubber material having flexibility can be elastically deformed and the thermal expansion of the lens unit can be absorbed by the lens barrel. The lens unit does not collide with the lens barrel excessively.

The imaging lens module of the present invention is configured to absorb the thermal expansion of each lens during the reflow soldering process by the elasticity of the lens barrel.

According to the imaging lens module of the present invention, when soldering the imaging device and various electronic components assembled on the substrate, the solder is heated to about 250 to 255 ° C., and the lens unit is thermally expanded. Even if the lens unit is thermally expanded by heating due to the attaching process, the lens barrel made of a synthetic rubber material having flexibility can be elastically deformed so that the lens unit can absorb the thermal expansion of the lens unit. It does not hit the tube excessively and interfere with it.

The imaging lens module of the present invention is characterized in that each of the lenses and the holder is made of a plastic material.

According to the imaging lens module of the present invention, the lens and the holder can be easily molded.

The imaging lens module of the present invention is characterized in that the lens unit is mounted on a mobile phone.

According to the imaging lens module of the present invention, it is possible to image pickup lens module mounted in a mobile phone, to produce at the same time the module integration.

According to the imaging lens module of the present invention, a plurality of lenses are stacked in the optical axis direction and stored in a cylindrical lens barrel, and each lens is positioned and stored in the cylindrical lens barrel in the radial direction. Since the lens barrel is formed of a synthetic rubber material having flexibility and heat resistance, the lens barrel is elastically deformed even if the lens unit is thermally expanded in the radial direction due to heat. Since the lens can be absorbed, the lens is not strongly pressed against the lens barrel, the generation of deformation and stress can be suppressed, and the deterioration of the optical performance due to the positional deviation of the lens unit can be prevented.

According to the imaging lens module of the present invention, each of the plurality of lenses is positioned on the overlapping surface of the lenses as a positioning unit, and each of the conical fitting portions centered on the optical axis is formed. And a pair of lens holders for holding each lens in a sandwiched manner, and at least one of the lens holders is an overlapping surface with the lens. The conical fitting portions centered on the optical axis are formed, and the tapered surfaces of the fitting portions are respectively fitted to position and hold the lenses in the radial direction with respect to the lens barrel. With this configuration, the lens unit can be accurately positioned in the lens barrel in a state where the optical axis of the lens unit and the axis of the lens barrel coincide.

According to the imaging lens module of the present invention, one of the lens pressers is configured by a flange portion formed on the lens barrel, and the other lens presser is slidably fitted on the inner peripheral surface of the lens barrel. The plurality of lenses constituting the lens unit and the lens holding frame are sequentially inserted into the lens barrel so that the preceding lens is brought into contact with the flange portion, and the lens holding frame is used as the last lens. After pressing and positioning and holding each lens in the radial direction with respect to the lens barrel, the lens retaining frame and the lens barrel are integrally fixed. The lens unit can be accurately positioned in the lens barrel in a state in which the axis of the lens barrel coincides, and the lens unit is interposed between the flange portion formed on the lens barrel and the lens holding frame. Preparative it is possible to fix the lens unit and clamped.

According to the imaging lens module of the present invention, a holder to be assembled to the lens barrel and the substrate on which the imaging element is mounted is provided, an internal thread portion is formed on the inner peripheral surface of the holder, and the lens barrel is formed on the internal thread portion. The male screw part formed on the outer peripheral surface of the lens unit is screwed, and the lens unit assembled in the lens barrel is adjusted in the optical axis direction according to the screwing amount so that the lens unit is focused on the image sensor. after the integrating the holder and the lens barrel, and an electronic component of reflow implemented in packaged state to the substrate as an imaging lens module by assembling the substrate for mounting the lens barrel and the image sensor in the holder Since the soldering process is performed, there is no need to attach the lens unit to the holder later, and the imaging lens module is assembled by assembling the lens unit and the substrate on which the imaging element is mounted to the holder. And because it is possible soldering process of various electronic components including an imaging element mounted on the substrate by reflow soldering while packaged is to improve productivity, it is possible to reduce the manufacturing cost.

According to the imaging lens module of the present invention, since the thermal expansion of each lens when the reflow soldering process is performed is configured to be absorbed by the elasticity of the lens barrel, the lens unit and the imaging device are attached to the holder. When soldering processing of various electronic components including an image sensor mounted on a substrate in a state where the mounted substrate is assembled and packaged as an imaging lens module, the lens barrel is elastically deformed even if the lens unit is thermally expanded. The generation of deformation and stress can be suppressed without being strongly pressed against the lens barrel.

According to the imaging lens module of the present invention, since each of the lenses and the holder is made of a plastic material, the molding process of the lens and the holder is easy, and the thermal expansion coefficient between the lens and the lens barrel is reduced. Even if a difference occurs, interference between the lens and the lens barrel can be prevented.

According to the imaging lens module of the present invention, since the lens unit is mounted on a mobile phone, the productivity of the imaging lens module incorporating the lens unit is improved, thereby reducing the manufacturing cost of the mobile phone. Can also be granted.

  Hereinafter, an embodiment as the best mode for carrying out the present invention will be described with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to other than those described in the embodiments without departing from the spirit of the invention.

  FIG. 1 is a sectional view of an imaging lens module according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an exploded state of the lens unit. In FIG. 1, an imaging lens module 1 includes a lens unit 4 composed of two first lenses 2 and a second lens 3, a lens barrel 15 incorporating the lens unit 4, a lens barrel 15 and a CCD. A holder 40 in which a substrate 30 on which various electronic components including the image sensor 20 are mounted is configured. The first lens 2 and the second lens 3 and the holder 40 constituting the imaging lens module 1 are molded articles made of resin, and the lens barrel 15 is a synthetic rubber material (for example, silicone rubber) having excellent flexibility and heat resistance. ).

  The lens barrel 15 has a male screw portion 16 formed on the outer peripheral surface, and the male screw portion 16 is screwed to a female screw 17 formed on the inner peripheral surface of the holder 40, whereby the lens barrel 15 is attached to the holder 40. Include. At this time, the position of the lens barrel 15 and the lens unit 4 integrally incorporated in the lens barrel 15 can be adjusted in the optical axis direction by the screwing amount of the lens barrel 15, and the optical axis of the lens barrel 15 with respect to the holder 40 can be adjusted. After adjusting the position in the direction, the holder 40 and the lens barrel 15 are integrated by an adhesive.

  The first lens 2 and the second lens 3 inserted into the lens barrel 15 are formed slightly larger in diameter than the inner periphery of the lens barrel 15, and the outer periphery of the first lens 2 and the second lens 3 is formed on the lens barrel 15. The first lens 2 and the second lens 3 are positioned in the radial direction in the lens barrel 15 by lightly pressing into the inner periphery. Further, in order to accurately match the optical axes S of the first lens 2 and the second lens 3 inserted in the lens barrel 15, the first lens 2 and the second lens 3 are positioned on the overlapping surface, and Conical fitting portions 5 and 6 centering on the optical axis S are formed on the outer periphery of the edge of each of the first lens 2 and the second lens 3, and the inner portion of the fitting portion 5 formed on the first lens 2 is formed. By fitting the taper surface 6a of the outer peripheral surface of the fitting portion 6 to the taper surface 5a of the peripheral surface, the first lens 2 and the second lens 3 are positioned in the radial direction, and the first lens 2 and the second lens 2 Each lens 3 is held in a state where the optical axes S thereof coincide. In the present embodiment, the first lens 2 and the second lens 3 are sandwiched and held by a pair of lens pressers in the lens barrel 15. This lens presser includes a flange portion 7 formed inward from the front peripheral edge of the lens barrel 15 and a lens presser frame 8 inserted into the lens barrel 15. The first lens 2 and the second lens 2 are provided inside the lens barrel 15. The lens 3 and the lens holding frame 8 are inserted in this order, and the lens holding frame 8 is pressed against the second lens 3 in a state where the previously inserted first lens 2 is abutted against the flange 7. 8, the first lens 2 and the second lens 3 are sandwiched from the front and rear. The presser frame 8 is provided with a protruding protrusion at the periphery with a space therebetween, and the protrusion is press-fitted and held inside the lens barrel 15, and the lens barrel 15 and the lens presser frame 8 are bonded by the adhesive A. Adhere and fix. The lens holding frame 8 is a molded product made of a hard synthetic resin different from the lens barrel 15. Further, in order to make the axis of the lens barrel 15 coincide with the optical axes of the first lens 2 and the second lens 3, conical fitting portions 9 centered on the optical axis S are respectively provided on the second lens 3 and the lens holding frame 8. , 10 are respectively formed, and the tapered surface 10a of the outer peripheral surface of the fitting portion 10 of the lens pressing frame 8 is fitted to the tapered surface 9a of the inner peripheral surface of the fitting portion 9 formed on the second lens 3. In this way, the lens holding frame 8 fixed to the lens barrel 15 and the fitting portions 9 and 10 of the second lens 3 are fitted, and the fitting portions of the first lens 2 and the second lens 3 are fitted. By fitting 5 and 6, the first lens 2 and the second lens 3 are fixed to the lens barrel 15 in a state where the optical axes of the first lens 2 and the second lens 3 coincide with the axis of the lens barrel 15. To do. In the present embodiment, a light-shielding diaphragm plate 45 is interposed between the first lens 2 and the second lens 3.

  Various electronic components including the image sensor 20 are soldered to the substrate 30 by reflow soldering. In the reflow soldering process of the substrate 30, the imaging lens module 1 is packaged, that is, the lens barrel 15 incorporating the lens unit 4 including the two first lenses 2 and the second lens 3, and the substrate 30. Are transferred to the reflow soldering furnace in a state of being incorporated in the holder 40.

  In the above-described embodiment configured as described above, first, the first lens 2 is inserted into the lens barrel 15 through the opening of the lens barrel 15, and then the second lens 3 is inserted via the light-shielding diaphragm plate 45. Insert into the lens barrel 15. At this time, by fitting the tapered surface 6a of the fitting portion 6 of the second lens 3 to the tapered surface 5a of the fitting portion 5 formed on the first lens 2, the taper surface 5a of the first lens 2 is aligned. The tapered surface 6a of the second lens 3 is guided, and the optical axes S of the first lens 2 and the second lens 3 coincide with each other. A light-shielding diaphragm plate 45 is provided on the first lens 2 and the second lens 3. It is pinched and held. Further, by inserting the lens pressing frame 8 into the lens barrel 15, the fitting portions 9 and 10 of the second lens 3 and the lens pressing frame 8 are respectively fitted, and the flange portion 7 of the lens barrel 15 and the lens pressing frame are fixed. The first lens 2 and the second lens 3 are sandwiched and held between the frame 8. Thereafter, the lens barrel 15 and the lens holding frame 8 are bonded and fixed, so that the optical axis of the first lens 2 and the second lens 3 and the axis of the lens barrel 15 coincide with each other inside the lens barrel 15. The first lens 2 and the second lens 3 are housed and fixed. Thereafter, the male screw portion 16 formed on the outer peripheral surface of the lens barrel 15 is screwed onto the female screw 17 formed on the inner peripheral surface of the holder 40 to temporarily fix the lens barrel 15 to the holder 40, and to image the holder 40. A substrate 30 on which various electronic components including the element 20 are mounted is assembled into a module. In this way, the amount of screwing of the lens barrel 15 screwed to the holder 40 in a state where the component parts are assembled to the holder 40 is adjusted, and the position of the lens barrel 15 in the optical axis direction with respect to the holder 40 is adjusted to adjust the lens for the image sensor 20. After the unit 4 is focused, the holder 40 and the lens barrel 15 are integrated with an adhesive. Thereafter, the imaging lens module 1 is transported to a reflow soldering furnace, and various electronic components including the imaging element 20 are soldered to the substrate 30. At this time, the imaging lens module 1 is heated to about 250 to 255 ° C. where the solder melts. As described above, when various components are assembled in the holder 40 and packaged as the imaging lens module 1 and soldered in a reflow soldering furnace, the holder 40, the first lens 2, the second lens 3, and the lens barrel 15. It is heated entirely including. At this time, the first lens 2 and the second lens 3 are thermally expanded by heating in a reflow soldering furnace. However, since the lens barrel 15 is formed of a synthetic rubber having flexibility and heat resistance, the first lens 2 and Even if the second lens 3 is thermally expanded, the lens barrel 15 is elastically deformed so that the first lens 2 and the second lens 3 can absorb the thermal expansion, and strongly strike the inner peripheral surface of the lens barrel 15. There is no interference. In addition, the second lens 3 and the fitting portions 9 and 10 of the lens pressing frame 8 fixed to the lens barrel 15 are fitted to each other, but the lens pressing frame 8 is a synthetic rubber having flexibility and heat resistance. Therefore, even if the first lens 2 and the second lens 3 are thermally expanded, the lens barrel 15 is elastically deformed via the lens pressing frame 8 and the first lens 2 and the second lens 3 are fixed. The lens 3 can absorb the thermal expansion. Thereby, interference with the 1st lens 2 and the 2nd lens 3, the lens-barrel 15, and the lens holding frame 8 can be prevented in a soldering process. Further, after the soldering process, the cooling process of the imaging lens module 1 is performed, and the fitting portions 9 and 10 of the lens pressing frame 8 fixed to the second lens 3 and the lens barrel 15 in a state where the imaging lens module 1 is cooled. Are fitted again, and the first lens 2 and the second lens 3 are aligned between the optical axis S of the first lens 2 and the second lens 3 and the axis of the lens barrel 15 to coincide with each other between the flange portion 7 of the lens barrel 15 and the lens pressing frame 8. The lens 2 and the second lens 3 can be sandwiched and held.

  As described above, in this embodiment, it is not necessary to attach the lens unit 4 to the holder 40 later, and the imaging lens module 1 is obtained by attaching the lens unit 4 and the substrate 30 on which the imaging element 20 is mounted to the holder 40. With the packaged and the focusing of the imaging device 20 and the lens unit 4 completed, the imaging lens module 1 is transferred to a reflow soldering furnace, and various electronic components including the imaging device 20 are soldered to the substrate 30. Therefore, the production work efficiency is improved, and the production cost can be reduced by improving the production. Further, when the lens unit 4 is soldered in the reflow soldering furnace, even if the first lens 2 and the second lens 3 are thermally expanded in the radial direction, the lens barrel 15 is bent and the first lens 2 and the second lens are bent. 3 can absorb the thermal expansion, and interference between the inner peripheral surface of the lens barrel 15 and the lens unit 4 can be prevented. Further, the first lens 2 and the second lens 3 are not positioned by the lens barrel 15, but the fitting portion 5 formed on the first lens 2 and the fitting portion 6 of the second lens 3 are fitted. As a result, the optical axes S of the first lens 2 and the second lens 3 coincide with each other, and the fitting portions 9 and 10 of the lens holding frame 8 fixed to the second lens 3 and the lens barrel 15 are fitted. By doing so, the optical axis S of the first lens 2 and the second lens 3 is accommodated with respect to the lens barrel 15, and between the flange portion 7 of the lens barrel 15 and the lens pressing frame 8. The first lens 2 and the second lens 3 are sandwiched between the lens unit 4 and the lens unit 4 without being changed. Therefore, the optical performance is not deteriorated by the positional deviation between the first lens 2 and the second lens 3.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes are possible. For example, the number of lenses incorporated in the lens barrel, the shape of the holder or the lens barrel, or the shape of the fitting portion formed on the first lens, the second lens, and the presser frame may be appropriately selected. For example, in the above-described embodiment, the conical fitting portions 5 and 6 are formed on the overlapping surface of the first lens 2 and the second lens 3, respectively, and the second lens 3 and the lens pressing frame 8 are overlapped. By forming conical fitting parts 9 and 10 on the mating surfaces, and fitting these fitting parts 5, 6, 9, and 10, respectively, the first lens 2, the second lens 3, and the second lens The first lens 2 and the second lens in the lens barrel 15 in a state where the lens 3 and the lens holding frame 8 are positioned in the radial direction and the optical axes S of the first lens 2 and the second lens 3 are aligned with each other. In the example shown in FIG. 3, the lens unit 4 is configured by the first lens 2 and the second lens 3 having different outer diameters. , 3 in a stepped manner on the inner peripheral surface of the lens barrel 15 corresponding to the diameter of 3 Difference surfaces 50 and 60 are formed, and the lenses 2 and 3 are sequentially press-fitted into the step surfaces 50 and 60 so that the first lens 2 and the second lens 3 are positioned in the radial direction with respect to the lens barrel 15. It may be configured. Thus, even if the outer periphery of the first lens 2 and the second lens 3 having different outer diameters is press-fitted into the stepped surfaces 50 and 60 formed on the inner peripheral surface of the lens barrel 15, the lens barrel 15 is flexible. When the first lens 2 and the second lens 3 are thermally expanded in the radial direction when molded in a reflow soldering furnace by molding with synthetic rubber having heat resistance and heat resistance, the lens barrel 15 is outward. Therefore, the first lens 2 and the second lens 3 can absorb the thermal expansion, and interference between the inner peripheral surface of the lens barrel 15 and the lens unit 4 can be prevented. In the embodiment, the outer diameters of the first lens 2 and the second lens 3 are formed slightly larger than the inner diameter of the lens barrel 15, and the outer periphery of the first lens 2 and the second lens 3 is the inner periphery of the lens barrel 15. In this example, the outer diameters of the first lens 2 and the second lens 3 are formed slightly smaller than the inner diameter of the lens barrel 15, and the lens barrel 15, the first lens 2 and the second lens 3 are formed. A slight clearance may be formed in between in the radial direction. Even if a slight clearance is formed between the lens barrel 15 and the first lens 2 and the second lens 3 in this way, the outer periphery of the edge of the first lens 2 and the second lens 3 is the same as in the above embodiment. Respectively have conical fitting portions 5 and 6 centered on the optical axis S, and the optical axes of the lens pressing frame 8, the second lens 3 and the lens pressing frame 8 press-fitted into the lens barrel 15, respectively. Conical fitting portions 9 and 10 centering on S are formed, and the fitting portions 5 and 6 formed on the first lens 2 and the second lens 3 and the second lens 3 and the lens pressing frame 8 are formed. By fitting the fitting portions 9 and 10 respectively, the first lens 2 and the second lens 2 are attached to the lens barrel 15 in a state where the optical axes of the first lens 2 and the second lens 3 are aligned with the axis of the lens barrel 15. The lens 3 can be fixed. Furthermore, in the said Example, although the example which shape | molded the lens holding frame 8 with the hard synthetic resin different from the lens-barrel 15 was shown, the lens holding frame 8 was equipped with the same flexibility and heat resistance as the lens-barrel 15. You may shape | mold with a synthetic rubber material.

It is sectional drawing of the imaging module which shows one Example of this invention. It is sectional drawing of an imaging module which shows a decomposition | disassembly state same as the above. It is sectional drawing of the principal part which shows the modification of this invention same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging lens module 2 1st lens 3 2nd lens 4 Lens unit 5, 6, 9, 10 Fitting part 5a, 6a, 9a, 10a Tapered surface 7 Flange part 8 Lens holding frame 15 Lens barrel 20 Imaging element 30 Substrate 40 holder

Claims (4)

A lens unit in which a plurality of lenses are overlapped in the optical axis direction is stored in a cylindrical lens barrel, and each lens is positioned and stored in the cylindrical lens barrel in the radial direction. A holder for assembling the substrate on which the element is mounted is provided, and the lens barrel and the substrate on which the imaging element is mounted are assembled to the holder, and the female screw portion is formed on the inner peripheral surface of the holder on the outer peripheral surface of the lens barrel. The lens unit is fixed to the image pickup device by adjusting the position of the lens unit in the optical axis direction according to the screwing amount, and the lens barrel and the image pickup device are mounted on the holder. with assembling the substrate for mounting, reflow of electronic components to be mounted on the substrate in a state of being packaged as a focus iMAGING lens module together with said lens unit with respect to the imaging element In the imaging lens module for performing data processing step, each of said lens and the holder is molded by resin, the lens barrel and by molding a synthetic rubber material which includes a flexible and heat resistance when performing the reflow soldering process An imaging lens module configured to absorb thermal expansion of each lens by elasticity of the lens barrel. As the positioning means for the plurality of lenses, a conical fitting portion is formed on the overlapping surface of the lenses and centered on the optical axis, and the tapered surfaces of the fitting portions are respectively fitted to each other. The lens is positioned in the radial direction and provided with a pair of lens pressers for holding and holding each of the lenses, and at least one of the lens pressers is positioned on the overlapping surface with the lens and is centered on the optical axis A conical fitting portion is formed, and a tapered surface of the fitting portion is fitted, and each lens is positioned and held in the radial direction with respect to the lens barrel. Item 2. The imaging lens module according to Item 1. One of the lens pressers is configured by a flange portion formed on the lens barrel, and the other lens presser is configured by a lens presser frame that is slidably fitted on the inner peripheral surface of the lens barrel, A plurality of lenses constituting the lens unit and the lens holding frame are sequentially inserted to bring the preceding lens into contact with the flange portion, and the lens holding frame is pressed against the last lens to 3. The imaging lens module according to claim 2, wherein each lens is positioned and held in the radial direction, and then the lens holding frame and the lens barrel are integrally fixed. Imaging lens module according to any one of claims 1 to 3, characterized in that the imaging lens module is mounted in a mobile phone.

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