JP2009122704A - Optical module and its manufacturing method, imaging apparatus and its manufacturing method, and camera system and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a fixing spacer to interpose between an optical filer and a lens is needed in order to incorporate the optical filter into a lens barrel, resulting in an increase in the number of components and a hinderance to a size reduction. <P>SOLUTION: The optical module 6 includes: a lens barrel 8 having a diaphragm part 8A formed at its leading end; and an lens 11 and the optical filter 10 incorporated in the lens barrel 8. The lens 11 is an integrally molded one, wherein a holding part 11C projecting in the direction of lens thickness further than the effective face of the lens, is integrally included on a peripheral part of the lens, and the holding part 11C is fixed in the lens barrel 8 in a state of being abutted on the optical filter 10. The optical filter 10 is formed like a plate having a size corresponding to the inner diameter of the lens barrel 8, and incorporated in the lens barrel 8 so as to be adjacent to the diaphragm portion 8A. The position of the direction of an optical axis is restricted by abutting of the holding part 11C of the lens 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical module suitable for use as an imaging optical system, an imaging device using the same, a camera system using the imaging device, and a method for manufacturing the same.

  FIG. 10 is a side sectional view showing a configuration of a conventional imaging apparatus. The illustrated imaging apparatus mainly includes an optical module 81 and an imaging module 82.

  The optical module 81 includes a lens barrel 83, a lens barrel holder 84, an optical filter 85, a fixing spacer 86, a lens 87, a lens pressing member 88, and the like. A male screw is formed on the outer peripheral surface of the lens barrel 83. On the other hand, a female screw is formed on the inner peripheral surface of the barrel holder 84. Then, the barrel 83 and the barrel holder 84 are coupled by screwing the screws together. In addition, a diaphragm 83A is integrally formed at the tip of the lens barrel 83. The optical filter 85 is incorporated in the lens barrel 83 in a form adjacent to the aperture portion 83A. Further, the fixing spacer 86 is interposed between the optical filter 85 and the lens 87, and the lens 87 is pressed by the lens pressing member 88 in this state, so that the optical filter 85, the fixing spacer 86, and the lens 87 are in the lens tube 83. Are held together.

  On the other hand, the imaging module 82 includes a package body 89, an imaging element 90, a seal glass 91, and the like. The image sensor 90 is fixed to the bottom surface of the recess of the package body 89 using a die bond material (not shown). In the recess of the package body 89, the image sensor 90 is sealed in an airtight state by a seal glass 91. The image sensor 90 and an external connection lead terminal (not shown) are electrically connected via a bonding wire (not shown).

  The optical module 81 and the imaging module 82 having the above-described configuration are coupled to each other with the lower end portion of the lens barrel holder 84 placed on the upper end portion of the package body 89 and the portions being fitted to each other. Yes.

  In the imaging apparatus configured as described above, the light incident from the aperture portion 83A of the lens barrel 83 is received by the imaging unit of the imaging device 90 through the optical filter 85, the lens 87, and the seal glass 91.

  FIG. 11 is a side sectional view showing the configuration of another conventional optical module. The illustrated optical module 92 includes a lens barrel 93, an optical filter 94, a lens 95, a lens pressing member 96, and the like. A diaphragm portion 93 </ b> A is integrally formed at the rear end portion of the lens barrel 93, and a diaphragm portion 96 </ b> A is also integrally formed at the distal end portion of the lens pressing member 96. Among these, the diaphragm portion 96 </ b> A corresponds to the light incident side of the optical module 92, and the diaphragm portion 93 </ b> A corresponds to the light emission side of the optical module 92. The optical filter 94 is fixed to the rear end surface (outer surface) of the lens barrel 93 with an adhesive 97. The lens 95 is held by a lens pressing member 96 in the lens barrel 93.

  In the imaging apparatus shown in FIG. 10, when the optical filter 85 is incorporated in the lens barrel 83, the effective surface (convex surface) 87 </ b> A of the lens 87 is not between the optical filter 85 and the lens 87. A fixing spacer 86 is interposed. For this reason, the number of parts is increased, which is disadvantageous for downsizing.

  Further, in the imaging apparatus, the optical imaging characteristics are greatly influenced by the positional relationship between the diaphragm portion 83A and the lens 87 in the optical axis direction (vertical direction in the figure), whereas conventionally, a lens pressing member Since the optical filter 85 is held via the lens 87 by the pressing force provided by the 88, if the thickness of the optical filter 85 varies due to manufacturing tolerances, the variation causes a positional shift between the aperture portion 83A and the lens 87. May occur, and the imaging performance of the imaging apparatus may be deteriorated. Further, there is a problem that the assembly accuracy in the lens barrel 83 is lowered due to the accumulated tolerance in assembly due to the interposition of the fixing spacer 86.

  On the other hand, in the optical module 92 shown in FIG. 11, since the optical filter 94 is attached to the outside of the lens barrel 93, the positional relationship between the diaphragm portion 93A and the lens 95 is displaced due to the thickness tolerance of the optical filter 94. However, since the optical filter 94 is fixed using the adhesive 97, a fixing time is required for curing the adhesive 97 in the manufacturing process. Further, the adhesive 97 flows out on the surface of the optical filter 94, which may cause the adhesive 97 to flow into the optical effective diameter of the optical module 92 and cause contamination.

  An optical module according to the present invention includes a lens barrel having a stop portion formed at the tip, a lens incorporated in the lens barrel, and an optical element other than the lens, and the lens is an integrally molded lens. A holding portion that protrudes in the lens thickness direction from the effective surface of the lens, and is fixed in the lens barrel in a state in which the holding portion is in contact with the optical element. The optical element has a plate shape having a size corresponding to the inner diameter of the lens barrel, and is incorporated in the lens barrel adjacent to the aperture portion, and is brought into contact with the holding portion of the lens. The position in the optical axis direction is restricted. The imaging apparatus according to the present invention has a configuration in which the optical module is mounted on the imaging module, and the camera system according to the present invention has a configuration using the imaging apparatus.

  In the optical module, the imaging device, and the camera system configured as described above, the optical module has a structure in which the holding portion is integrally formed on the outer peripheral portion of the lens so as to protrude from the lens effective direction in the lens thickness direction. The position of the optical element can be directly regulated by the lens without bringing the effective surface of the lens into contact with the optical element. This eliminates the need for adhesives for fixing components such as fixing spacers and optical elements such as optical filters that have been conventionally used.

  Further, the concave portion is formed integrally with the lens barrel, and the optical element is inserted into the concave portion, and the position of the optical element is regulated by the holding portion of the lens. It is possible to absorb at a depth dimension of. Thereby, the position of the lens in the lens barrel is uniquely determined without being influenced by the thickness dimension of the optical element.

  According to the present invention, as an optical module configuration, the lens is integrally formed on the outer peripheral portion of the lens so as to protrude in the lens plate thickness direction from the effective surface of the lens. Since the position of the element is regulated, it is possible to adjust the position directly with the lens while ensuring a gap between the effective surface of the lens and the optical element without using parts such as fixing spacers or adhesive as in the past. It becomes possible to hold the optical element. As a result, the number of parts can be reduced, and a decrease in assembly accuracy due to the interposition of a fixing spacer or the like can be avoided. In addition, in the manufacturing process, it is not necessary to fix a flat optical element such as an optical filter with an adhesive, so that the adhesive can be prevented from flowing into the optically effective diameter and the adhesive can be cured. It is possible to reduce the cost by reducing the fixing time of manufacturing from the number of manufacturing steps. Furthermore, by eliminating the use of fixing spacers and adhesives, material costs can be reduced, and the space previously occupied by the fixing spacers and the like is released, so that the optical module can be downsized. On the other hand, since the degree of freedom of optical layout in the lens barrel is increased, it is possible to improve optical performance such as resolution and peripheral light amount ratio.

  In addition, the concave portion is integrally formed in the lens barrel, and the optical element is inserted into the concave portion, and the position of the optical element is regulated by the lens holding portion, so that the variation in the thickness dimension of the optical element can be reduced. Can be absorbed in the depth dimension. As a result, the position of the lens in the lens barrel is uniquely determined without being influenced by the thickness dimension of the optical element. Therefore, in the case of using a lens barrel integrally having the aperture section, the aperture section and the lens are used. Imaging performance can be improved by increasing the relative positional accuracy (assembly accuracy).

1 is a block diagram schematically showing an overall configuration of a camera system according to the present invention. 1 is a side sectional view showing a configuration of an imaging apparatus according to a first embodiment of the present invention. It is a sectional side view which shows the structure of the other optical module which concerns on 1st Embodiment of this invention. It is a sectional side view which shows the structure of the imaging device which concerns on 2nd Embodiment of this invention. It is a sectional side view which shows the structure of the other optical module which concerns on 2nd Embodiment of this invention. It is a sectional side view which shows the structure of the imaging device which concerns on 3rd Embodiment of this invention. It is a figure explaining the 1st modification of the imaging device concerning the present invention. It is a figure explaining the 2nd modification of the imaging device concerning the present invention. It is a sectional side view which shows the application example of the imaging device which concerns on this invention. It is a sectional side view which shows the structure of the imaging device in the past. It is a sectional side view which shows the structure of the other conventional optical module.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram schematically showing the overall configuration of a camera system according to the present invention. The illustrated camera system 1 is processed by the imaging device 2, a signal processing unit 3 that performs various processing (for example, image compression processing) on the image signal obtained by the imaging device 2, and the signal processing unit 3. The signal output unit 4 outputs an image signal to the outside, and a power supply unit 5 that supplies power to these functional units.

  FIG. 2 is a side sectional view showing the configuration of the imaging apparatus according to the first embodiment of the present invention. The illustrated imaging apparatus is mainly composed of an optical module 6 and an imaging module 7.

  The optical module 6 includes a lens barrel 8, a lens barrel holder 9, an optical filter 10, a lens 11, and the like. A male screw is formed on the outer peripheral surface of the lens barrel 8. On the other hand, a female screw is formed on the inner peripheral surface of the lens barrel holder 9. Then, the barrel 8 and the barrel holder 9 are coupled by screwing the screws together. In addition, an aperture 8A is integrally formed at the tip of the lens barrel 8.

  The optical filter 10 is, for example, an optical element having a function of attenuating infrared rays (infrared cut function), a function of attenuating light of a specific wavelength such as visible light (such as an optical low-pass filter function), or both of these functions. is there. The optical filter 10 is a thin flat plate having a size corresponding to the inner diameter of the lens barrel 8, and is incorporated in the lens barrel 8 so as to be adjacent to the aperture portion 8A.

  The lens 11 is an integrally molded lens made of glass or plastic, and the effective surfaces 11A and 11B on both sides (upper and lower sides) each form a convex surface curved outward. The lens 11 forms an image of light incident on the effective surface 11A by an imaging unit of the imaging device 14 described later. A holding portion 11C is integrally formed on the outer peripheral portion of the lens 11 so as to protrude in the lens thickness direction (vertical direction in the drawing) from the effective surface 11A. In the lens barrel 8, the lens 11 is fixed by the adhesive 12 in a state where the holding portion 11 </ b> C of the lens 11 is in contact with the optical filter 10. The holding portion 11C of the lens 11 only needs to be formed in a state of protruding from the effective surface 11A only on the side facing the optical filter 10 (upper side in the drawing).

  On the other hand, the imaging module 7 includes a package body 13, an imaging element 14, a seal glass 15, and the like. The image sensor 14 is composed of, for example, a CCD image sensor, a CMOS image sensor, or the like, and is fixed to the bottom surface of the recess of the package body 13 using a die bond material (not shown). In the recess of the package body 13, the image sensor 14 is sealed in an airtight state by a seal glass 15. Further, the image sensor 14 and an external connection lead terminal (not shown) are electrically connected via a bonding wire (not shown).

  The optical module 6 and the imaging module 7 having such a configuration are coupled to each other in a state in which the lower end portion of the lens barrel holder 9 is placed on the upper end portion of the package body 13 and these portions are fitted to each other. Has been.

  In the imaging apparatus according to the first embodiment having the above-described configuration, the holding portion 11C is integrally formed on the outer peripheral portion of the lens 11 so as to protrude from the effective surface 11A of the lens 11, and the holding portion 11C forms the optical axis direction. The position of the optical filter 10 is regulated. Therefore, the optical filter 10 is held directly by the lens 11 in a state where a gap is secured between the effective surface 11A of the lens 11 and the optical filter 10 without using a fixing spacer as in the prior art. Is possible. Thereby, the number of parts of the optical module 6 can be reduced, and a decrease in assembly accuracy due to the interposition of the fixing spacer can be avoided.

  FIG. 3 is a side sectional view showing the configuration of another optical module according to the first embodiment of the present invention. The optical module 16 shown in FIG. 3 includes a lens barrel 17, an optical filter 18, a lens 19, a lens pressing member 20, and the like. A diaphragm portion 17 </ b> A is integrally formed at the rear end portion of the lens barrel 17, and a diaphragm portion 20 </ b> A is also integrally formed at the distal end portion of the lens pressing member 20. Among these, the diaphragm portion 20 </ b> A corresponds to the light incident side of the optical module 16, and the diaphragm portion 17 </ b> A corresponds to the light emission side of the optical module 16.

  The optical filter 18 is, for example, an optical element having a function of attenuating infrared rays (infrared cut function), a function of attenuating light of a specific wavelength such as visible light (such as an optical low-pass filter function), or both of these functions. is there. The optical filter 18 is a thin flat plate having a size corresponding to the inner diameter of the lens barrel 17 and is incorporated in the lens barrel 17 so as to be adjacent to the diaphragm portion 17A.

  The lens 19 is an integrally molded lens made of glass or plastic, and the effective surfaces 19A and 19B on both sides thereof form convex surfaces that are curved outward. The lens 19 forms an image of light incident on the effective surface 19A by an imaging unit (not shown) of an imaging device. A holding portion 19C is integrally formed on the outer peripheral portion of the lens 19 so as to protrude in the lens thickness direction (vertical direction in the drawing) from the effective surface 19B. In the lens barrel 17, the lens 19 is fixed by the lens pressing member 20 in a state where the holding portion 19 </ b> C of the lens 19 is in contact with the optical filter 18.

  In the optical module 16 having the above-described configuration, the holding portion 19C is integrally formed on the outer peripheral portion of the lens 19 so as to protrude from the effective surface 19B of the lens 19, and thereby the effective surface 19B of the lens 19 and the optical filter 18 are formed. Since the position of the optical filter 18 in the optical axis direction is regulated (held) by the holding portion 19C of the lens 19 in a state where a gap is secured between the optical filter and the optical filter, the optical filter is fixed with an adhesive as in the past. There is no need to do it. This eliminates the need for fixing time for curing the adhesive in the manufacturing process of the optical module 16, and avoids the occurrence of contamination within the optical effective diameter due to the flow of the adhesive on the optical filter surface. be able to.

  FIG. 4 is a side sectional view showing a configuration of an imaging apparatus according to the second embodiment of the present invention. In the imaging apparatus according to the second embodiment, only the configuration of the optical module 6 is different from that of the first embodiment, and other configurations are common.

  In other words, in the optical module 6 shown in FIG. 4, a diaphragm 8A is integrally formed at the tip of the lens barrel 8, and a recess 8B is integrally formed adjacent to the diaphragm 8A. The optical filter 10 is inserted into the recess 8B of the lens barrel 8, and the position of the optical filter 10 in the lens barrel 8 is regulated by the holding portion 11C of the lens 11 in this state.

  More specifically, the concave portion 8B of the lens barrel 8 has a planar dimension (vertical / horizontal dimension) that is substantially the same as or slightly larger than the outer method of the optical filter 10 if the optical filter 10 is a rectangular flat plate, for example. ) To form a rectangle. Further, the depth dimension of the recess 8B is set to be equal to or greater than the thickness dimension including the manufacturing tolerance of the optical filter 10 so that the optical filter 10 does not protrude from the recess 8B when the optical filter 10 is fitted therein.

  Specifically, if the thickness dimension T of the optical filter 10 in FIG. 4 is “T = Tref ± Δt (Tref is a design center value, Δt is a manufacturing tolerance)”, the depth dimension D of the recess 8B is “ It is set under the condition of “D ≧ Tref + Δt”. However, if the depth dimension D of the recess 8B is extremely increased with respect to the thickness dimension T of the optical filter 10, the play of the optical filter 10 in the recess 8B increases. Therefore, it is preferable to set the difference (D−T) between the depth dimension D and the thickness dimension T to the minimum necessary. In addition, when pursuing downsizing of the optical module 6, there is a concern that the dimensional ratio of the manufacturing tolerance Δt of the optical filter 10 becomes excessively large with respect to the depth dimension D of the concave portion 8B. In such a case, without adding the manufacturing tolerance Δt as it is, for example, a value obtained by reducing the manufacturing tolerance Δt by a predetermined ratio (for example, a ratio of ½) is added to the design center value Tref, and thus obtained. By setting the depth dimension D of the concave portion 8B with the measured value, it is possible to cope with it suitably.

  In FIG. 4, the inner method L1 of the holding unit 11C of the lens 11 and the outer method L2 of the optical filter 10 are set on the condition that the holding unit 11C can be brought into contact with at least four opposite corners of the optical filter 10. . Thereby, in the lens barrel 8, the position of the optical filter 10 in the optical axis direction (vertical direction in the figure) is held (restricted) with the lower surface of the optical filter 10 in contact with the upper end surface of the holding portion 11C of the lens 11. ) Further, under this holding state, a gap is always ensured between the lower surface of the optical filter 10 and the effective surface 11A of the lens 11 by the protrusion of the holding portion 11C from the effective surface 11A of the lens 11.

  In FIG. 4, the holding portion 11 </ b> C of the lens 11 contacts the optical filter 10, whereby a gap corresponding to the difference between the depth dimension D and the thickness dimension T exists on the side opposite to the contact portion. However, such a gap may exist between the holding portion 11 </ b> C of the lens 11 and the optical filter 10.

  In the optical module 6 configured as described above, the concave portion 8B is integrally formed in the lens barrel 8, and the optical filter 10 is held in the optical axis direction while the optical filter 10 is fitted in the concave portion 8B. The part 11C regulates it. Therefore, even if the thickness dimension T of the optical filter 10 varies due to manufacturing tolerances, the variation is absorbed by the depth dimension of the recess 8B. As a result, it is possible to increase the relative positional accuracy of the aperture 8A and the lens 11 and avoid a decrease in imaging performance.

  FIG. 5 is a side sectional view showing the configuration of another optical module according to the second embodiment of the present invention. In the optical module 16 shown in FIG. 5, the coupling state of the lens barrel 17, the optical filter 18, and the lens 19 is different from that of the optical module structure shown in FIG.

  That is, a diaphragm portion 17A is integrally formed at the rear end portion of the lens barrel 17, and a concave portion 17B is integrally formed adjacent to the diaphragm portion 17A. An optical filter 18 is fitted into the concave portion 17B of the lens barrel 17, and the position of the optical filter 18 in the optical axis direction (vertical direction in the figure) is held by the holding portion 19C of the lens 19 in this state.

  The relationship between the planar dimension of the recess 17B in the lens barrel 17 in FIG. 5 and the external method of the optical filter 18 incorporated in the lens barrel 17, the depth dimension D of the recess 17B, and the thickness dimension T of the optical filter 18 are as follows. And the relationship between the inner method L1 of the holding portion 19C of the lens 19 and the outer method L2 of the optical filter 18 are the same as the dimensional relationship described with reference to FIG.

  In FIG. 5, a gap corresponding to the difference between the depth dimension D and the thickness dimension T exists between the holding part 19 </ b> C of the lens 19 and the optical filter 18, but the holding part 19 </ b> C of the lens 19. Is in contact with the optical filter 18, a similar gap exists on the side opposite to the contact portion.

  In the optical module 16 having the above-described configuration, the holding portion 19C is integrally formed on the outer peripheral portion of the lens 19 so as to protrude from the effective surface 19B of the lens 19, and thereby the effective surface 19B of the lens 19 and the optical filter 18 are formed. The position of the optical filter 18 in the optical axis direction is regulated (held) by the holding portion 19C of the lens 19 in a state in which a gap is secured between them. Therefore, there is no need to fix the optical filter with an adhesive as in the prior art. This eliminates the need for fixing time for curing the adhesive in the manufacturing process of the optical module 16, and avoids the occurrence of contamination within the optical effective diameter due to the flow of the adhesive on the optical filter surface. be able to.

  In addition, the concave portion 17B is integrally formed in the lens barrel 17, and the position of the optical filter 18 in the optical axis direction is regulated by the holding portion 19C of the lens 19 with the optical filter 18 fitted in the concave portion 17B. Yes. Therefore, even if the thickness dimension T of the optical filter 18 varies due to manufacturing tolerances, the variation is absorbed by the depth dimension of the recess 17B. As a result, it is possible to increase the relative positional accuracy of the diaphragm portion 17A and the lens 19 and to avoid a decrease in imaging performance.

  FIG. 6 is a side sectional view showing the configuration of the imaging apparatus according to the third embodiment of the present invention. In the imaging apparatus according to the third embodiment, only the configuration of the imaging module 7 is different from that of the second embodiment, and other configurations are common.

  That is, the imaging module 7 shown in FIG. 6 includes a substrate 21 and an imaging element 22. The substrate 21 is, for example, a wiring substrate obtained by bonding a thin metal plate and a flexible wiring substrate, or a wiring substrate mainly composed of a resin material, a ceramic material, a glass material, or the like. A through hole 21 </ b> A for light transmission is provided in a substantially central portion of the substrate 21.

  The image pickup device 22 is composed of, for example, a CCD image pickup device, a CMOS image pickup device or the like, and an image pickup unit (not shown) is provided on the main surface thereof. In the imaging unit, a large number of pixels having a photoelectric conversion function are two-dimensionally arranged. In addition, a plurality of electrode portions (aluminum pads or the like) are formed on the periphery of the main surface of the image pickup element 22 so as to surround the image pickup portion.

  The image pickup device 22 is mounted (directly attached) on the lower surface (wiring pattern forming surface) of the substrate 21 in a bare chip state by a flip chip method or the like, whereby an electrode portion (not shown) of the image pickup device 22 and the substrate are mounted. 21 wiring patterns are electrically connected. Further, in this mounted state, the image pickup unit of the image pickup element 22 is arranged in a state of being exposed from the through hole 21 </ b> A of the substrate 21.

  With respect to the imaging module 7 having such a configuration, the lower end portion of the lens barrel holder 9 is fitted to the outer edge portion of the substrate 21, whereby the optical module 6 is mounted on the imaging module 7. Even when the configuration of the imaging module 7 is different as described above, the optical module 6 has a configuration in which a concave portion 8B is integrally formed in the lens barrel 8 and an optical filter is formed in the concave portion 8B, as in the second embodiment. 10 is inserted, the position of the optical filter 10 in the optical axis direction is restricted by the holding portion 11C of the lens 11 to increase the relative positional accuracy of the aperture portion 8A and the lens 11, and the imaging performance is deteriorated. Can be avoided.

  In the first to third embodiments, the lens barrel holder 9 is provided in the optical module 6 and the optical module 6 is mounted on the imaging module 7 via the lens barrel holder 9. Not limited to this, as shown in FIGS. 7A and 7B, the optical module 6 is attached to the imaging module 7 in a state where the lower end portion of the lens barrel 8 is in direct contact (placement) with the imaging module 7. It can also be installed.

  The lens structure in the optical module is not limited to a lens structure having both convex surfaces as described above, and various lens structures can be employed. That is, as shown in FIGS. 8A and 8B, each of the effective surfaces 11A and 11B and 19A and 19B of the lenses 11 and 19 form a plane, and a diffraction grating is formed on the plane to produce light. It is also possible to employ binary optics with a convergence function. It is also possible to adopt a lens in which the lens effective surfaces on both sides are both concave, or a lens having a convex surface on one side and a concave surface on the other side.

  FIG. 9 is a side sectional view showing an application example of the imaging apparatus according to the present invention. In the illustrated imaging apparatus, as a configuration of the optical module 6, a plurality of (two in the illustrated example) lenses 23 and 24 are incorporated in one lens barrel 8 together with the optical filter 10. A holding portion 23 </ b> C is formed on the outer peripheral portion of one lens 23 so as to protrude from the effective surfaces 23 </ b> A and 23 </ b> B of the lens 23 in the lens plate thickness direction. A holding portion 24 </ b> C is formed on the outer peripheral portion of the other lens 24 so as to protrude in the lens plate thickness direction from the effective surface 24 </ b> A of the lens 24.

  A concave portion 8B is formed integrally with the aperture portion 8A at the distal end portion of the lens barrel 8, and the optical filter 10 is positioned in the optical axis direction by the holding portion 23C of the lens 23 in a state where the optical filter 10 is fitted into the concave portion 8B. It is regulated. A diaphragm 25 is interposed between the lenses 23 and 24. The diaphragm 25 is fitted into a stepped portion 24D formed integrally with the other lens 24, and the holding portions 23C and 24C of the lenses 23 and 24 are brought into contact with each other in this state, so that the diaphragm in the optical axis direction is obtained. The position 25 is regulated by the holding portions 23C and 24C. Further, the other lens 24 is fixed to the lens barrel 8 with an adhesive 26.

  The imaging module 7 includes a package body 13, an imaging element 14, a seal glass 15 and the like, similar to the one shown in FIG. The optical module 6 and the imaging module 7 are coupled to each other with the lower end portion of the lens barrel holder 9 placed on the upper end portion of the package body 13 and the portions fitted to each other. . As the imaging module 7, the one having the configuration shown in FIG. 6 can be used. Further, when mounting the optical module 6 on the imaging module 7, as shown in FIGS. 7A and 7B, the lens barrel 8 of the optical module 6 is placed in direct contact with the imaging module 7. It is also possible.

  In this application example, the concave portion 8B is formed integrally with the lens barrel 8, and the position of the optical filter 10 in the optical axis direction is restricted by the holding portion 23C of the lens 23 in a state where the optical filter 10 is fitted into the concave portion 8B. As a result, the relative positional accuracy of the aperture 8A and the lens 23 can be increased. Further, since the diaphragm 25 is interposed between the lenses 23 and 24 in a state where the holding portions 23C and 24C of the two lenses 23 and 24 are in contact with each other, the assembly accuracy due to the intervention of the diaphragm 25 is achieved. The relative positional accuracy of the aperture 8A and the lens 24 can also be improved while avoiding the decrease of. As a result, it is possible to realize an imaging apparatus with excellent imaging performance.

  DESCRIPTION OF SYMBOLS 1 ... Camera system, 2 ... Imaging device, 6, 16 ... Optical module, 7 ... Imaging module, 8, 17 ... Lens barrel, 8A, 17A ... Aperture part, 8B, 17B ... Recessed part 10, 18 ... Optical filter, 11 , 19 ... Lens, 11A, 11B, 19A, 19B ... Effective surface, 11C, 19C ... Holding part

Claims (17)

A lens barrel having a stop formed at the tip;
A lens incorporated in the lens barrel and an optical element other than the lens;
The lens is an integrally molded lens, and integrally includes a holding portion that protrudes in the lens thickness direction from the effective surface of the lens on the outer peripheral portion of the lens, and the holding portion is brought into contact with the optical element. Fixed in the barrel in a state,
The optical element has a plate shape having a size corresponding to the inner diameter of the lens barrel, and is incorporated in the lens barrel adjacent to the aperture portion, and receives light by contact of the lens holding portion. An optical module with restricted axial position. The optical module according to claim 1, wherein the lens is an integrally molded lens made of glass or plastic. The optical module according to claim 1, wherein the optical element is an optical filter having a function of attenuating infrared rays, a function of attenuating light of a specific wavelength, or both. The optical module according to claim 1, wherein the lens holding portion is formed so as to protrude in the lens thickness direction from the effective surface of the lens only on the side facing the optical element. The optical module according to claim 1, wherein the lens is fixed by an adhesive. The optical module according to claim 1, further comprising: a lens pressing member that presses the lens, and a diaphragm portion that is integrally formed on a distal end side of the lens pressing member. A screw is formed in a male-female relationship on the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens barrel holder that supports the lens barrel, and the screws are screwed together. The optical module according to claim 1, wherein the optical module is coupled to a tube holder. A lens barrel having a stop portion formed at the tip, a lens incorporated in the lens barrel and an optical element other than the lens, and the lens is an integrally molded lens, and is provided on the outer periphery of the lens. A holding portion that protrudes in the lens thickness direction from the effective surface of the lens is integrally formed, and is fixed in the lens barrel in a state in which the holding portion is in contact with the optical element. It is a plate having a size corresponding to the inner diameter of the tube, and is incorporated in the lens barrel adjacent to the diaphragm portion, and the position in the optical axis direction is regulated by the contact of the lens holding portion. An optical module,
An imaging apparatus comprising: an imaging module on which the optical module is mounted. In the optical module and the imaging module, the lower end portion of the lens barrel holder that supports the lens barrel is placed on the upper end portion of the package body of the imaging module, and the lens barrel holder and the package body are fitted to each other. The imaging device according to claim 8, wherein the imaging devices are coupled to each other in a state. A lens barrel having a stop portion formed at the tip, a lens incorporated in the lens barrel and an optical element other than the lens, and the lens is an integrally molded lens, and is provided on the outer periphery of the lens. A holding portion that protrudes in the lens thickness direction from the effective surface of the lens is integrally formed, and is fixed in the lens barrel in a state in which the holding portion is in contact with the optical element. It is a plate having a size corresponding to the inner diameter of the tube, and is incorporated in the lens barrel adjacent to the diaphragm portion, and the position in the optical axis direction is regulated by the contact of the lens holding portion. An optical module,
A camera system using an imaging device comprising: an imaging module on which the optical module is mounted. When manufacturing an optical module using a lens barrel having a stop formed at the tip, and a lens and an optical element other than the lens,
The optical element is formed in a plate shape having a size corresponding to the inner diameter of the lens barrel, and the optical element is incorporated in the lens barrel so as to be adjacent to the aperture portion,
A holding portion is integrally formed on the outer peripheral portion of the lens so as to protrude in the lens thickness direction from the effective surface of the lens, and the lens is placed in the lens barrel while the holding portion is in contact with the optical element. A method of manufacturing an optical module that regulates the position of the lens in the optical axis direction in the lens barrel by fixing and fixing. The method of manufacturing an optical module according to claim 11, wherein a glass or plastic integrally molded lens is used as the lens. The method for manufacturing an optical module according to claim 11, wherein the lens is fixed with an adhesive. The method of manufacturing an optical module according to claim 11, wherein the lens is fixed by a lens pressing member. A screw is formed in a male-female relationship on the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens barrel holder that supports the lens barrel, and the screws are screwed together. The manufacturing method of the optical module of Claim 11 which couple | bonds a cylinder holder. When manufacturing an imaging apparatus using an optical module including a lens barrel having a stop portion formed at the tip, a lens and an optical element other than the lens, and an imaging module for mounting the optical module,
The optical element is formed in a plate shape having a size corresponding to the inner diameter of the lens barrel, and the optical element is incorporated in the lens barrel so as to be adjacent to the aperture portion,
A holding portion is integrally formed on the outer peripheral portion of the lens so as to protrude in the lens thickness direction from the effective surface of the lens, and the lens is placed in the lens barrel while the holding portion is in contact with the optical element. A method of manufacturing an imaging device that regulates the position of the lens in the optical axis direction in the lens barrel by fixing and incorporating the lens. When manufacturing a camera system using a lens barrel having a stop portion formed at the tip, an optical module including a lens and an optical element other than the lens, and an imaging module for mounting the optical module,
The optical element is formed in a plate shape having a size corresponding to the inner diameter of the lens barrel, and the optical element is incorporated in the lens barrel so as to be adjacent to the aperture portion,
A holding portion is integrally formed on the outer peripheral portion of the lens so as to protrude in the lens thickness direction from the effective surface of the lens, and the lens is placed in the lens barrel while the holding portion is in contact with the optical element. A method for manufacturing a camera system, in which the position of the lens in the optical axis direction is regulated in the lens barrel by fixing and fixing.

Images