JP5468790B2 - Lens module manufacturing method - Google Patents

Description

The present invention relates to a manufacturing how such a lens module.

  In recent years, camera modules have been mounted on portable electronic devices such as mobile phones and portable computers, and so-called wafer level camera modules have been proposed.

  As such a wafer level camera module, Patent Document 1 discloses a camera module configured by a solid-state imaging device chip having a wafer level, a chip size, and a package structure and a cylindrical outer frame covering the periphery of the solid-state imaging device chip. It is disclosed. In the camera module, a lens barrel holding a plurality of lenses focused on a light receiving surface of a solid-state image sensor chip is screwed and fixed to one end of an outer frame body, and a flush end surface of the solid-state image sensor chip is connected to the other end. It is mated. Then, the optical axis of the lens is fixed vertically to the center of the light receiving surface of the solid-state image sensor chip, so that the optical axis shift when the solid-state image sensor chip is attached to the lens barrel is minimized.

JP 2008-166939 A

  However, camera modules used in electronic devices such as mobile phones are required to be further miniaturized and to have higher performance such as functions such as zoom and autofocus as the electronic devices become smaller. For example, not only the intra-group eccentricity in the lens unit but also the inter-lens eccentricity between the lens units in a camera module including a plurality of lens units does not occur. Required. The camera module includes a folding optical system that disperses, refracts, totally reflects, and birefringes light by a prism or the like, in addition to a rectilinear optical system that includes a lens group through which light travels straight. When manufacturing the folding optical system camera module, for example, the adhesive applied between the laminated lens group and the prism is irradiated with UV light and bonded. There is a concern that the UV light is totally reflected and the UV light does not reach the adhesion site, resulting in insufficient adhesion.

  According to some aspects of the present invention, a highly accurate lens module and camera module can be efficiently manufactured.

  One aspect of the present invention is a method of manufacturing a lens module including an optical path bending element that bends an optical path with respect to the optical axis direction, and a lens substrate forming step of forming a lens substrate having a plurality of lenses formed on the substrate; An optical path bending member installation step of installing an optical path bending member for forming a plurality of optical path bending elements in the optical axis direction of the lens substrate, and in the optical path bending member installation step, the optical path bending member is The present invention relates to a method of manufacturing a lens module in which an outer frame member that fixes the optical path bending member is provided so as to cover an outer periphery of the lens substrate when the lens substrate is installed in the optical axis direction.

  According to one aspect of the present invention, when the optical path bending member is installed in the optical axis direction of the lens substrate, the optical path bending member and the optical system composed of the lens substrate are restrained from generating eccentricity, and manufactured. The accuracy of the manufactured lens module can be increased.

  At this time, in one aspect of the present invention, the optical path bending member includes a plurality of the optical path bending members in a second direction that is perpendicular to the first direction when the optical axis direction is the first direction. It is good also as a prism member of the triangular prism shape which has the length which can cut | divide an optical path bending element.

  In this way, it is possible to efficiently manufacture a plurality of lens modules including the optical path bending element.

  In one aspect of the present invention, a positioning member having a positioning through-hole for determining a position where the prism member is installed is provided on one end surface of the prism member in the second direction. The other end face of the prism member in the second direction is provided with a rotation stop member in which a through hole for rotation prevention for preventing the rotation of the prism member is formed, and in the optical path bending member installation step, When the optical path bending member is installed in the optical axis direction of the lens substrate, an outer frame member that fixes the prism member via the positioning member and the rotation stopper member is provided so as to cover the outer periphery of the lens substrate. May be.

  In this way, by using the outer frame member, the work efficiency when the prism member is installed in the optical axis direction of the lens substrate is improved.

  In the aspect of the invention, the outer frame member may be inserted through the positioning boss of the prism member for inserting the through hole formed in the positioning member and the through hole formed in the rotation stopping member. A rotation-stop boss of the prism member, and in the optical path bending member installation step, the positioning boss is inserted through a through-hole formed in the positioning member, and the rotation-stop boss is The optical path bending member may be installed in the optical axis direction of the lens substrate by inserting a through hole formed in the rotation stop member.

  In this way, by inserting the positioning member into the positioning boss and inserting the anti-rotation member into the anti-rotation boss, the accuracy in installing the prism member in the optical axis direction of the lens substrate is improved.

  Also, in one aspect of the present invention, a lens module array fitting in which two lens module arrays formed by installing the optical path bending element on the lens substrate are fitted so that the inclined surfaces of the optical path bending members are in contact with each other. A bonding step and an adhesion fixing step of irradiating and fixing at least a bonding portion between the optical path bending member and the lens substrate after the lens module array fitting step may be included.

  In this way, the optical path bending members included in the two lens module arrays formed by installing the optical path bending members for forming a plurality of optical path bending elements in the optical axis direction of the lens substrate are brought into contact with each other. After the fitting, the adhesive fixing step is executed. For this reason, it can prevent that the adhesion | attachment of the said adhesion location becomes inadequate because the ultraviolet light to irradiate is totally reflected on the slope of an optical path bending member, and does not reach an adhesion location.

  In the aspect of the invention, in the lens module array fitting step, the positioning boss included in the outer frame member provided when forming one lens module array in the optical path bending member installation step. The through hole formed in the positioning member of the prism member included in the other lens module array is inserted, and the rotation stop boss included in the outer frame member is included in the other lens module array. By inserting a through hole formed in the rotation stop member of the prism member, the inclined surfaces of the optical path bending members included in the one lens module and the other lens module may be fitted to each other. .

  In this case, the positioning members of both lens module arrays are inserted into the positioning bosses of the outer frame member, and the rotation stopping members of both lens module arrays are inserted into the rotation stopping bosses. The accuracy of fitting the two lens module arrays by bringing the inclined surfaces into contact with each other is improved.

  Further, in one aspect of the present invention, a cutting step of cutting into each of the plurality of lenses formed on the lens substrate after the bonding and fixing step, and two lenses in which slopes of the bending elements are in contact with each other after the cutting step An assembly step of assembling the lens module by dividing the module.

  If it does in this way, a plurality of lens modules which installed an optical path bending element can be manufactured efficiently.

  In the aspect of the invention, in the lens substrate forming step, a plurality of lens substrates are formed, and after the lens substrate forming step, the peripheral portions of the lenses formed on the lens substrate are arranged in the optical axis direction. A through hole forming step for forming at least one through hole penetrating into the optical axis, and a laminating step for laminating the plurality of lens substrates in the optical axis direction after the through hole forming step, and the optical path bending element installation step Then, you may provide the said outer frame member after the said lamination process.

  If it does in this way, when installing a prism member in the lens array formed by the lamination process, it becomes possible to install a prism member using an outer frame member.

  In the aspect of the invention, the lens substrate forming step includes a thickness adding step of adding a thickness in the optical axis direction to the peripheral portion of each lens, and the through-hole forming step includes the thickness. At least one through-hole penetrating in the optical axis direction through the peripheral edge portion to which is added, and in the laminating step, the penetration formed in the peripheral edge portion to which the thickness is added as viewed from the optical axis direction The plurality of lens substrates may be stacked in the optical axis direction so that the positions of the holes overlap.

  In this way, the manufacturing accuracy when manufacturing a lens module array by stacking a plurality of lens substrates is improved.

  Further, in one aspect of the present invention, the method includes a shaft portion insertion step of inserting a shaft portion into the through hole after the through hole forming step, and the assembly step includes a plurality of lens substrates stacked in the stacking step. In order to form a lens unit, the lens module may be assembled by moving the plurality of lens units in the optical axis direction through the shaft portion inserted in the shaft portion insertion step.

  In this way, a lens module including a lens unit movable in the optical axis direction can be efficiently manufactured.

  In one aspect of the present invention, in the lens substrate forming step, a plurality of lens substrates are formed, and after the lens substrate forming step, the plurality of lens substrates are stacked in the optical axis direction; A through hole forming step of forming at least one through hole penetrating a peripheral edge of each lens formed on the lens substrate in the optical axis direction after the laminating step, and in the optical path bending element installing step, The outer frame member may be provided after the stacking step.

  Thus, by laminating a plurality of lens substrates in the optical axis direction and performing a through-hole forming step, the positional accuracy of the through-holes when forming the through-holes in the peripheral portions of the lenses of the plurality of lens substrates is increased. Can be secured.

  In one aspect of the present invention, in the lens substrate forming step, a plurality of lens substrates are formed, and after the lens substrate forming step, the plurality of lens substrates are stacked in the optical axis direction; A through hole forming step of forming at least one through hole penetrating a peripheral edge portion of each lens formed on the lens substrate in the optical axis direction during the laminating step, and the optical path bending element installation step Then, you may provide the said outer frame member after the said lamination process.

  Thus, by performing a through-hole forming step between the laminating steps of laminating a plurality of lens substrates in the optical axis direction, through-holes when forming through-holes in the peripheral portions of the lenses of the plurality of lens substrates Position accuracy can be ensured.

  Another aspect of the present invention is a lens module including an optical path bending element that bends an optical path with respect to the optical axis direction, and is formed by cutting each lens from a lens substrate on which a plurality of lenses are formed. And a lens module including an optical path bending element installed in the optical axis direction of the optical element.

  At this time, in another aspect of the present invention, a shaft portion penetrating at least one through hole formed in a peripheral portion of each lens of the optical element in the optical axis direction, and a peripheral edge of the lens of the optical element A spacer provided to add a thickness to the optical axis direction with respect to a portion, and the shaft portion is formed in the peripheral portion of each lens to which the thickness is added by the spacer. A hole may be penetrated in the optical axis direction.

  In another aspect of the invention, the optical path bending element may include at least one lens unit movable in the optical axis direction.

  Another aspect of the present invention relates to a camera module including the lens module described above and an image sensor that converts light imaged by the lens module into an electrical signal.

  Another aspect of the present invention relates to an electronic device including the camera module described above.

Sectional drawing in the optical axis direction of one Embodiment of the camera module of this invention. 6 is a flowchart showing a method for manufacturing the lens module according to the embodiment. FIG. 3A and FIG. 3B are schematic explanatory views of the manufacturing method of the lens module of the embodiment. 4 (A) and 4 (B) are schematic explanatory views of the method for manufacturing the lens module of the embodiment. The flowchart which shows the thickness addition process of the manufacturing method of the lens module which concerns on this embodiment. Schematic explanatory drawing of the manufacturing method of the lens module of the embodiment. FIG. 7A and FIG. 7B are schematic explanatory views of the manufacturing method of the lens module of the embodiment. FIG. 8A and FIG. 8B are schematic explanatory views of the manufacturing method of the lens module of the embodiment. Schematic explanatory drawing of the manufacturing method of the lens module of the embodiment. Schematic explanatory drawing of the manufacturing method of the lens module of the embodiment. FIG. 11A is an external perspective view of the lens module of the embodiment, and FIG. 11B is a cross-sectional view taken along the line CC in FIG. The perspective view of the electronic device containing the camera module of this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

1. Configuration FIG. 1 is a cross-sectional view illustrating the configuration of a camera module including a lens module according to an embodiment of the present invention.

  As shown in FIG. 1, the camera module 100 of the present embodiment includes a prism 104 that is an optical path bending element that bends an optical path L of subject light incident from the subject side with respect to the optical axis directions D2 and D4 of the subject side lens 102. The lens module 123 includes lens units 122 and 124 that are bent substantially at right angles and guided to the image sensor 108.

  Specifically, as shown in FIG. 1, the camera module 100 includes a subject-side lens 102, a first lens unit 122, a second lens unit 124, a shaft 126 (shaft portion) on a substantially cylindrical main body portion 105. ), The image sensor 108, and the IR cut filter 110. In the present embodiment, in the camera module 100, the first lens unit 122 is fixed to the subject side lens 102 side of the main body 105, and the second lens unit 124 is in the optical axis direction of the lens unit 124 via the shaft 126. Light imaged by the lens module 123 configured to be movable to D1 and D3 is converted into an electrical signal by the image sensor 108.

  The image sensor 108 is a CCD, for example, and outputs a signal corresponding to the received light. As shown in FIG. 1, the image sensor 108 is provided on the circuit board 106, and an IR cut filter 110 for cutting infrared rays is provided between the image sensor 108 and the lens unit 102.

  In the present embodiment, in the first lens unit 122, a spacer 136 is provided between the front end side optical element 128 in which the front end side lens 130 is formed and the rear end side optical element 132 in which the rear end side lens 134 is formed. They are stacked in the optical axis directions D1 and D3. That is, the spacer 136 is laminated in the optical axis directions D1 and D3 so that the peripheral portions 129 and 133 of the lenses 130 and 134 of the optical elements 128 and 132 are thick in the optical axis directions D1 and D3. In the first lens unit 122, as shown in FIG. 1, the prism 104 is installed via a spacer 137 on the optical axis direction D1 of the distal end side optical element 128 and on the D1 side of D3. Further, in the present embodiment, the first lens unit 122 has the spacer 136 laminated between the front end side optical element 128 and the rear end side optical element 132, and the front end side in the optical axis directions D1 and D3 of the shaft 126. (D1 side) is fitted and fixed.

  On the other hand, in the second lens unit 124, the spacer 146 is disposed in the optical axis direction between the front end side optical element 138 on which the front end side lens 140 is formed and the rear end side optical element 142 on which the rear end side lens 144 is formed. Laminate on D1 and D3. That is, the spacers 146 are stacked in the optical axis directions D1 and D3 so that the peripheral portions 139 and 143 of the lenses 140 and 144 of the optical elements 138 and 142 are thick in the optical axis directions D1 and D3. The second lens unit 124 is slidably fitted to the shaft 126 using the spacer 146 as a sleeve portion.

  As described above, in the present embodiment, the optical elements 128, 132, 138, 142 formed by separating the lenses of the plurality of lenses from the lens substrate are provided with the spacers 136, 146, thereby providing the optical axis directions D1, D3. The thickness is secured. By doing so, even if the optical elements 128, 132, 138, 142 become thinner as the camera module 100 becomes smaller, the lens units 122, 124 are made thicker in the optical axis directions D1, D3 by the spacers 136, 146. Can be given.

  For this reason, the part which penetrates and fits the front-end | tip of the shaft 126 from the D1 side of the optical axis directions D1 and D3 to the 1st lens unit 122 can be ensured largely in the optical axis directions D1 and D3. Accordingly, the first lens unit 122 is stably fixed to the distal end side of the shaft 126 without being shaken with respect to the optical axis directions D1 and D3. On the other hand, a portion where the shaft 126 that moves the second lens unit 124 in the optical axis directions D1 and D3 is fitted in the second lens unit 124 can be largely secured in the optical axis directions D1 and D3. Accordingly, when the second lens unit 124 moves in the optical axis directions D1 and D3 via the shaft 126, the lens unit 124 does not move with respect to the optical axis directions D1 and D3, and the optical axis directions D1 and D3. Can be prevented from occurring.

  In the present embodiment, the lens units 122 and 124 are made thick in the optical axis directions D1 and D3 by the spacers 136 and 146, so that the lenses 130, 134, 140, and 144 in the lens units 122 and 124 are within the group. Suppresses the occurrence of eccentricity. In addition, by providing the lens units 122 and 124 with thicknesses in the optical axis directions D1 and D3, it is possible to secure a large portion in the optical axis directions D1 and D3, so that the lens units 122 and 124 can be secured. Can be prevented from decentering between the lens units 122 and 124 without being shaken with respect to the optical axis directions D1 and D3.

2. Manufacturing Method FIG. 2 is a flowchart showing a manufacturing method of the lens module according to this embodiment. The lens module manufacturing method of the present embodiment is mainly used for manufacturing a lens module included in a wafer-level camera module, and particularly relates to a lens module manufacturing method in which a prism is installed. As shown in FIG. 2, the manufacturing method includes a lens substrate forming step S11, a through hole forming step S12, a laminating step S13, a shaft portion inserting step S14, an optical path bending member installing step S15, a lens module array fitting step S16, an adhesion It includes a fixing step S17, a cutting step S18, and an assembly step S19.

  FIG. 3 is a schematic explanatory view of the lens substrate forming step S11 and the through hole forming step S12. In the lens substrate forming step S11, as shown in FIG. 3, a plurality (for example, several thousand) of glass substrates for lenses, for example, an optical wafer made of glass, transparent resin, or a composite material thereof is used. A lens 152 is formed. In the present embodiment, the lens substrate 150 is formed using, for example, a lithography technique or an etching technique that is common in semiconductor manufacturing. The lens substrate forming step S11 includes a thickness forming step of adding a thickness to the peripheral portion 153 in order to give the thickness in the optical axis directions D1 and D3 of the peripheral portion 153 of each lens 152 formed on the lens substrate 150. It is good as well. That is, before the through-hole forming step S12, the peripheral edge 153 of each lens 152 may be thickened in the optical axis directions D1 and D3, and then the through-holes 154 and 156 may be formed in the thickened peripheral edge 153.

  Next, in the through-hole forming step S12, through-holes 154 and 156 penetrating in the optical axis directions D1 and D3 are formed in the periphery 153 of each lens 152 formed on the lens substrate 150 as shown in FIG. It is formed by an etching technique or the like. As described later, the through holes 154 and 156 formed in the through hole forming step S12 are positioned when the plurality of lens substrates 150 and 160 and the plurality of spacers (before cutting) 170 and 180 are stacked in the stacking step S13. It is used as a marking. In the shaft portion insertion step S14, the through holes 154 and 156 are used as through holes through which the shafts SH1 and SH2 (shaft portions) serving as moving means when moving the lens unit in the optical axis directions D1 and D3 are inserted. The In the through hole forming step S12, the surface of the through holes 154 and 156 is made of a slidable material so that the lens unit moves smoothly in the optical axis directions D1 and D3. It is preferable to coat.

  FIG. 4 is a schematic explanatory view of the stacking step S13. In the stacking step S13, as shown in FIG. 4, for example, a plurality of lens substrates 150 and 160 that are the same size, and have the same number and arrangement of lenses 152 and 162 are formed in the optical axis direction. Laminate on D1 and D3. At this time, the plurality of lens substrates 150 and 160 are arranged in the optical axis directions D1 and D3 so that the positions of the through holes 154 and 156 formed in the plurality of lens substrates 150 and 160 overlap each other when viewed from the optical axis directions D1 and D3. Laminate. In the present embodiment, as shown in FIG. 4, in the stacking step S <b> 13, an opening 172 is formed on the lens substrates 150 and 160 with a predetermined thickness and in contact with the lenses 152 and 162 by an etching technique or the like. , 182 formed spacers (before cutting) 170 and 180 and the lens substrates 150 and 160 are laminated to increase the thickness in the optical axis directions D1 and D3 of the lens unit. That is, in the present embodiment, the stacking step S13 is a thickness that adds thickness to the peripheral portions 153 and 163 in order to give the peripheral portions 153 and 163 of the lenses 152 and 162 thickness in the optical axis directions D1 and D3. It also serves as an additional process.

  Further, in this embodiment, spacer side through holes 184 and 186 penetrated in the optical axis directions D1 and D3 by an etching technique or the like at the peripheral portions of the openings 172 and 182 of the spacers (before cutting) 170 and 180, It is provided at a position overlapping with the through holes 154 and 156 formed in the lens substrates 150 and 160. In this embodiment, the through-hole forming step S12 is performed before the stacking step S13. However, the through-hole forming step S12 may be performed after the stacking step S13 or during the stacking step S13. That is, for example, if positioning markings are separately formed on the end portions of the lens substrates 150 and 160 and the spacers 170 and 180 by an etching technique or the like, the lens substrates 150 and 160 and the spacers 170 and 180 are stacked. The through holes 154, 156, 184, 186 may be formed. As described above, when the lens substrates 150 and 160 and the spacers 170 and 180 are stacked and then the through holes 154, 156, 184, and 186 are formed, the positions of the through holes 154, 156, 184, and 186 are the positions of the lens substrates 150, 160 and the spacers 170 and 180 do not shift each other, which is desirable because the positional accuracy can be ensured.

  In the present embodiment, the spacers 170 and 180 are materials that have good compatibility with the adhesive, can be diced, have heat resistance and light shielding properties, have a certain degree of strength, and slide. It is preferable that the material has good properties or can be shaft-coated. Further, in order to make the movement when the lens unit moves in the optical axis directions D1 and D3 smooth, the through holes 184 and 186 formed in the spacers 170 and 180 are made in the same manner as the lens substrates 150 and 160. The surface may be coated with a slidable material.

  As described above, in this embodiment, in order to increase the thickness in the optical axis directions D1 and D3 of the lens unit, as shown in FIG. 4, in the stacking step S13, the lens substrates 150 and 160 and the spacers 170 and 180 are provided. Laminate. In addition, as long as the thickness is ensured in the optical axis directions D1 and D3, the number of stacked spacers is not limited.

  In the stacking step S <b> 13, when the distance between the lens 152 of the lens substrate 150 and the lens 162 of the lens substrate 160 is fixed, the interval between the lens substrate 150 and the spacer 170 and between the spacer 170 and the lens substrate 160. Adhesive etc. are applied and bonded. On the other hand, when both the lenses 152 and 162 can be freely contacted and separated in the optical axis directions D1 and D3, the lens substrate 150 and the spacer 170 or the spacer 170 and the lens substrate 160 are not bonded. Laminate as it is. Hereinafter, details of the operation of laminating the lens substrate and the spacer in the laminating step S13 will be described with reference to the flowchart shown in FIG.

  In the stacking step S13, when the first to Nth lens substrates are stacked via at least one spacer, as shown in FIG. 5, first, the i + 1th lens substrate is placed on the optical axis with respect to the ith lens substrate. It is determined whether or not to move in the direction (S51). When fixing the (i + 1) th lens substrate with respect to the i-th lens substrate, an adhesive is applied between the i-th lens substrate and the spacer (S52), and then on the i-th lens substrate. Spacers are stacked (S53). Thereafter, an adhesive is applied between the spacer laminated on the i-th lens substrate and the i + 1-th lens substrate (S54), and the i + 1-th lens substrate is laminated thereon (S55). Are bonded between the lens substrate and the spacer and between the spacer and the (i + 1) th lens substrate.

  On the other hand, when the i + 1th lens substrate is moved in the optical axis direction with respect to the ith lens substrate, the adhesive between the ith lens substrate and the spacer is removed as shown in FIG. The application is omitted and non-adhesion is performed, and a spacer is laminated on the i-th lens substrate as it is (S53).

  In the present embodiment, as described above, the spacer-side through holes 184 and 186 penetrating in the optical axis directions D1 and D3 are formed on the periphery of the openings 172 and 182 of the spacers 170 and 180, respectively. It is formed at a position overlapping with the through holes 154 and 156 formed in 160. By forming the through holes 184 and 186 in this way, when the lens substrates 150 and 160 and the spacers 170 and 180 are stacked in the stacking step S13, the through holes 154 and 156 of the lens substrates 150 and 160 and the spacer 170 are stacked. , 180 spacer side through-holes 184 and 186 can be used for marking. That is, positioning can be performed so that the through holes 154 and 156 of the lens substrates 150 and 160 and the spacer side through holes 184 and 186 of the spacers 170 and 180 are arranged to penetrate in the optical axis directions D1 and D3. For this reason, the positional deviation at the time of manufacturing the lens unit by stacking the lens substrates 150 and 160 and the spacers 170 and 180 is suppressed, and the accuracy at the time of manufacturing the lens module is improved.

  When the lamination step S13 is completed, the shaft 126 (see FIG. 1) made of a metal such as stainless steel or a hard resin is inserted into the through holes 184 and 186 so as to slide in the through holes 184 and 186 (shaft portion insertion). Step S14).

  When the shaft portion insertion step S14 is completed, an optical path bending member for forming a plurality of prisms 104 serving as optical path bending elements is installed in the optical axis direction of the lens substrate (optical path bending member installation step S15). Hereinafter, the details of the optical path bending member installation step S15 will be described with reference to the drawings. FIG. 6 is a schematic explanatory view showing a state in which an outer frame member for installing the prism member is provided in the optical path bending member installation step S15, and FIG. 7 (A) is an external perspective view of the prism member. FIG. 7B is a schematic explanatory view showing a state in which the prism member is installed via the outer frame member in the optical path bending member installation step S15.

  In the present embodiment, as shown in FIG. 7A, the optical path bending member has a direction perpendicular to the first direction D1 when one of the optical axis directions D1 and D3 is the first direction D1. This is a prism member 104b having a substantially triangular prism shape having a length enough to cut a plurality of prisms 104 (optical path bending elements) in the second direction D2. As shown in FIG. 7A, a positioning member 104c2 in which a positioning through-hole 104c1 for determining a position for installing the prism member 104b is formed on the end surface 104c on the second direction D2 side of the prism member 104b. It is done. On the other hand, on the end surface 104d on the fourth direction D4 side opposite to the second direction D2 of the prism member 104b, the prism member 104b is installed on the optical axis directions D1 and D3 of the lens substrates 150 and 160, respectively. At this time, a rotation stop member 104d2 in which a rotation stop through-hole 104d1 for preventing rotation of the prism member 104b is formed is provided.

  If both of these through-holes 104c1 and 104d1 have a round hole shape that fits a positioning boss 194 and a rotation-stop boss 196 of the outer frame member 190 described later, even a slight error may lead to malfunction. There is. For this reason, in the present embodiment, in order to absorb the influence of the error in preparation for the case where an error occurs in the component accuracy at the time of manufacturing, among the through holes 104c1 and 104d1, for example, the positioning through hole 104c1 is provided. A round hole-shaped through hole fitted to the positioning boss 194 may be used, and the rotation-preventing through hole 104d1 may be formed as an elongated hole-shaped through hole. As described above, the positioning through hole 104c1 is a round hole-shaped through hole, the rotation center of the prism member 104b is used, and the rotation stop through-hole 104d1 is a long hole-shaped through hole. The position accuracy when installing the prism member 104b can be ensured by absorbing the influence of the above.

  In the optical path bending member installation step S15, in order to install the prism member 104b (optical path bending member) on the D1 side of the optical axis directions D1 and D3 of the lens substrates 150 and 160, first, as shown in FIG. It is provided so as to cover the outer periphery of the lens substrates 150 and 160 and the spacers 170 and 180 on which the outer frame member 190 for fixing the member 104b is laminated. The outer frame member 190 is formed of a hard material having workability such as metal such as plastic or brass, and is formed on the positioning member 104c2 of the prism member 104b on one side 190L of the outer frame member 190 as shown in FIG. A plurality of positioning bosses 194 of the prism member 104b through which the through-hole 104c1 is inserted are provided along the one side 190L. Then, on one side 190R opposite to one side 190L of the outer frame member 190, a rotation stop boss 196 of the prism member 104b for inserting the through hole 104d1 formed in the prism member 104b rotation stop member 104d2 is formed on the one side 190R. A plurality are provided along. The positioning boss 194 and the rotation stop boss 196 may be formed by integral molding with the outer frame member 190 with resin or the like, or stainless steel or the like with respect to the outer frame member 190 formed with resin or the like. It may be formed by later press-fitting a metal pin made of the above metal or the like. Further, the outer frame member 190 may be integrally formed on the outer edge portions of the spacers 170 and 180 stacked on the lens substrates 150 and 160 provided to add thickness.

  In the optical path bending member installation step S15, when the prism member 104b is installed on the D1 side of the optical axis directions D1 and D3 of the lens substrates 150 and 160, an adhesive is applied to the contact surface between the prism member 104b and the stacked spacer 180. Etc., the prism member 104 b is placed on the spacer 180. At this time, as shown in FIG. 7B, the positioning boss 194 is inserted into the through hole 104c1 formed in the positioning member 104c2 of the prism member 104b, thereby positioning the prism member 104b. Then, in order to prevent the prism member 104b from rotating through the positioning boss 194, the rotation stop boss 196 is inserted into the through hole 104d1 formed in the rotation stop member 104d2 of the prism member 104b.

  In this way, one prism member 104b is fitted to the pair of positioning bosses 194 and the rotation stop boss 196, and as shown in FIG. The prism member 104b is fitted to each of the bosses 196, and the lens module array 50 before being cut into the lens modules 123 is formed. In the present embodiment, when the lens module array 50 is formed, the positioning member 104c2 and the rotation stop member 104d2 are provided on both ends of each prism member 104b included in the lens module array 50. The outer frame member 190 is provided with bosses 194 and 196 for fixing the positioning member 104c2 and the rotation stopper member 104d2 to the laminated lens substrates 150 and 160 and the spacers 170 and 180 on which the prism member 104b is placed. Then, the positioning member 104c2 of each prism member 104b and the rotation stop member 104d2 are fitted. In this way, it is possible to suppress the occurrence of eccentricity between the prism member 104b and the optical system composed of the lens substrates 150 and 160 stacked in the optical axis directions D1 and D3, thereby improving the accuracy of the manufactured lens module. Can be increased.

  FIG. 8A shows a schematic explanatory view of the lens module array fitting step S16, and FIG. 8B shows a schematic explanatory view of the adhesion fixing step S17. In the lens module array fitting step S16, as shown in FIG. 8A, the two lens module arrays 50a and 50b formed through the above-described steps S11 to S15 are installed in the lens module arrays 50a and 50b. The prism members 104b are fitted so that the inclined surfaces 104s come into contact with each other.

  At this time, the positioning boss 194 included in the outer frame member 190 provided when the one lens module array 50a is formed is formed on the positioning member 104c2 of the prism member 104b included in the other lens module array 50b. The through hole 104c1 is inserted. At the same time, the rotation stop boss 196 included in the outer frame member 190 is inserted into the through hole 104d1 formed in the rotation stop member 104d2 of the prism member 104b included in the other lens module array 50b.

  FIG. 9 is a schematic explanatory view after the lens module array fitting step S16 is completed. In the lens module array fitting step S16, as shown in FIG. 9, the positioning members 104c2 of both lens module arrays 50a and 50b are inserted into the positioning boss 194, and the rotation stopping member 104d2 is inserted into the rotation stopping boss 196. . By inserting the positioning member 104c2 into the positioning boss 194 and the rotation stopping member 104d2 into the rotation stopping boss 196 in this way, the slope of the prism member 104b included in one lens module 50a and the other lens module 50b. 104s are fitted so as to contact each other.

  When the lens module array fitting step S16 is completed, as shown in FIG. 8B, the spacer 180 having the ultraviolet light UV between the prism member 104b and the lens substrate 160, the bonding position between the prism member 104b, and The adhesive material is fixed by irradiating the adhesion portions between the spacers 170 and 180 and the lens substrates 150 and 160 (adhesion fixing step S17). As described above, in this embodiment, the prism member 104b and the spacer 180 are fitted after the slopes 104s of the prism members 104b of the two lens module arrays 50a and 50b are brought into contact with each other in the lens module array fitting step S16. UV light is irradiated to the adhesion part where the adhesive is applied between the spacers 170 and 180 and the lens substrates 150 and 160.

  If the adhesive fixing step S17 is performed after the end of the optical path bending member installation step S15 without passing through the lens module array fitting step S16, the UV light may be inclined on the prism member 104b depending on the irradiation angle of the irradiated UV light. There is a possibility that the prism member 104b and the spacer 180 may not be sufficiently bonded because the total reflection on 104s does not reach the bonding site.

  On the other hand, in the present embodiment, when UV light is applied and bonded and fixed, the inclined surfaces 104s of the prism members 104b of the two lens module arrays are brought into contact with each other, so that the UV light is prism members. It is possible to prevent total reflection on the slope 104s of 104b. For this reason, UV light is reliably irradiated to the said adhesion | attachment location, and a lens module with high adhesive strength between each member can be manufactured more reliably.

  FIG. 10 is a schematic explanatory view after the cutting step S18 is completed. When the bonding and fixing step S17 is completed, the two lens modules 122a are diced and cut into each of the plurality of lenses 150 and 160 formed on the lens substrates 150 and 160 in the cutting step S18, as shown in FIG. , 122b are separately cut in a state where the inclined surfaces 104s of the prism 104 are brought into contact with each other.

  FIG. 11A shows a schematic explanatory view after the assembly step S19 is completed, and FIG. 11B is a cross-sectional view taken along the line CC in FIG. After the cutting step S18, in the assembling step S19, the two lens modules 122a and 122b with which the inclined surfaces 104s of the prism 104 are in contact with each other are divided and the lens unit 122 is assembled as shown in FIG. S19). In this way, through the assembly step S19, as shown in FIG. 11B, the prism 104 is installed on the D1 side of the optical axis directions D1 and D3 of the optical elements 128 and 132 on which the lenses 130 and 134 are formed. A lens unit 122 is formed. In the assembling step S19, when a plurality of lens units are formed from the plurality of lens substrates laminated in the laminating step S13, in order to realize the desired optical performance of the lens unit 122, in the shaft portion insertion step S14. The plurality of lens units are moved in the optical axis direction through the inserted shaft 126 (shaft portion). Then, the distance between the lens units is set to a desired size, and the lens module is assembled.

3. Electronic Device FIG. 12 is a perspective view of a mobile phone which is an example of an electronic device on which a camera module including the lens module of the present embodiment is mounted. The camera module 16 of the present embodiment is provided on the back surface 14 which is the back side of the front surface 12 on which the operation unit and the display screen of the mobile phone 10 are provided. In addition, the site | part in which the camera module 16 is provided is not limited to the back side of the mobile telephone 10, You may install in another site | part. In addition, the electronic device in which the camera module according to the present embodiment is mounted is not limited to a mobile phone, and can be applied to a portable electronic device such as a portable computer, other electronic devices, and the like.

  Although the present embodiment has been described in detail as described above, those skilled in the art can easily understand that many modifications can be made without departing from the novel matters and effects of the present invention. Let's go. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term anywhere in the specification or the drawings. Further, the configurations and operations of the lens module, the camera module, and the electronic device are not limited to those described in the present embodiment, and various modifications can be made.

10 Cellular phone (electronic device) 50, 50a, 50b Lens module array,
16, 100 camera module, 102 subject side lens,
104 prism (optical path bending element),
104b Prism member (optical path bending member),
104c1, 104d1 through-hole, 104c2, positioning member,
104d2 anti-rotation member, 105 main body, 106 circuit board, 108 image sensor,
110 IR cut filter, 122, 124 Lens unit,
123 lens module, 126 shaft (shaft),
128, 132, 138, 142 Optical element, 150, 160 Lens substrate,
129, 133, 139, 143, 153, 163 peripheral edge,
130, 134, 140, 144, 152, 162 lenses,
136, 137, 146 spacers, 154, 156, 184, 186 through holes,
170, 180 spacer (before cutting), 190 outer frame member, 194 positioning boss,
196 Anti-rotation boss

Claims (12)

A method of manufacturing a lens module including an optical path bending element for bending an optical path with respect to an optical axis direction,
A lens substrate forming step of forming a lens substrate having a plurality of lenses formed on the substrate;
An optical path bending member installation step of installing an optical path bending member for forming a plurality of optical path bending elements in the optical axis direction of the lens substrate;
Including
In the optical path bending member installation step,
When the optical path bending member is installed in the optical axis direction of the lens substrate, an outer frame member for positioning the optical path bending member is provided so as to cover the outer periphery of the lens substrate. Method. In claim 1,
The optical path bending member is
When the optical axis direction is the first direction, a prism having a prism shape having a length enough to cut the plurality of optical path bending elements in a second direction perpendicular to the first direction. A method of manufacturing a lens module, which is a member. In claim 2,
On one end surface of the prism member in the second direction is provided a positioning member in which a positioning through-hole for determining a position where the prism member is installed is formed,
The other end face of the prism member in the second direction is provided with a rotation stop member having a through hole for rotation prevention for preventing the rotation of the prism member,
In the optical path bending member installation step,
When the optical path bending member is installed in the optical axis direction of the lens substrate, an outer frame member that fixes the prism member via the positioning member and the rotation stopper member is provided so as to cover the outer periphery of the lens substrate. A method for manufacturing a lens module. In claim 3,
The outer frame member is
A positioning boss of the prism member for inserting a through hole formed in the positioning member;
A boss for rotation prevention of the prism member for inserting a through hole formed in the rotation prevention member;
Including
In the optical path bending member installation step,
By inserting the positioning boss through a through-hole formed in the positioning member, and inserting the rotation-stop boss through a through-hole formed in the rotation-stopping member, the optical path bending member is attached to the lens substrate. A lens module manufacturing method, wherein the lens module is installed in the optical axis direction. In any one of Claims 1 thru | or 4,
After the optical path bending member installation step,
A lens module array fitting step of fitting two lens module arrays formed by installing the optical path bending element on the lens substrate so that the inclined surfaces of the optical path bending members are in contact with each other;
An adhesive fixing step of irradiating and fixing at least an adhesive spot between the optical path bending member and the lens substrate after the lens module array fitting step;
The manufacturing method of the lens module characterized by including. In claim 5,
In the lens module array fitting step,
Formed on the positioning member of the prism member included in the other lens module array on the positioning boss included in the outer frame member provided when forming one lens module array in the optical path bending member installation step By inserting the through hole formed in the anti-rotation member of the prism member included in the other lens module array into the anti-rotation boss included in the outer frame member. A method of manufacturing a lens module, wherein the slopes of the optical path bending members included in the one lens module and the other lens module are fitted so as to contact each other. In claim 5 or 6,
A cutting step of cutting into each of the plurality of lenses formed on the lens substrate after the adhesive fixing step;
An assembly step of assembling the lens module by dividing two lens modules in which the inclined surfaces of the bending elements are in contact with each other after the cutting step;
The manufacturing method of the lens module characterized by including. In any of claims 3 to 7,
In the lens substrate forming step, a plurality of lens substrates are formed,
After the lens substrate forming step, a through hole forming step of forming at least one through hole penetrating a peripheral portion of each lens formed on the lens substrate in the optical axis direction;
A laminating step of laminating the plurality of lens substrates in the optical axis direction after the through-hole forming step,
In the optical path bending element installation step, the outer frame member is provided after the lamination step. In claim 8,
In the lens substrate forming step,
A thickness adding step of adding a thickness in the optical axis direction to the peripheral edge of each lens;
In the through hole forming step,
Forming at least one through-hole penetrating the peripheral edge to which the thickness is added in the optical axis direction;
In the lamination step,
The lens module, wherein the plurality of lens substrates are stacked in the optical axis direction so that the positions of the through holes formed in the peripheral edge portion to which the thickness is added as viewed from the optical axis direction overlap. Production method. In claim 8 or 9,
Including a shaft portion insertion step of inserting a shaft portion into the through hole after the through hole forming step,
In the assembly process,
In order to form a plurality of lens units from a plurality of lens substrates stacked in the stacking step, the plurality of lens units are moved in the optical axis direction via the shaft portion inserted in the shaft portion insertion step. And assembling the lens module. In any of claims 3 to 7,
In the lens substrate forming step, a plurality of lens substrates are formed,
After the lens substrate forming step, a laminating step of laminating the plurality of lens substrates in the optical axis direction;
A through-hole forming step of forming at least one through-hole penetrating a peripheral edge portion of each lens formed on the lens substrate in the optical axis direction after the laminating step;
In the optical path bending element installation step,
A method for manufacturing a lens module, comprising providing the outer frame member after the laminating step. In any of claims 3 to 7,
In the lens substrate forming step, a plurality of lens substrates are formed,
After the lens substrate forming step, a laminating step of laminating the plurality of lens substrates in the optical axis direction;
A through hole forming step of forming at least one through hole penetrating a peripheral edge portion of each lens formed on the lens substrate in the optical axis direction during the laminating step,
In the optical path bending element installation step,
A method for manufacturing a lens module, comprising providing the outer frame member after the laminating step.

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