JP2007011409A - Optical lens unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical lens unit that is capable of simplifying a mechanism for adjusting the focal point of a lens and can be miniaturized. <P>SOLUTION: The optical lens unit 10 comprises an optical lens 40 for focusing a light beam, a hollow cylindrical lens holder 20 having, on an inner circumferential surface, a support section 23 supporting an outer circumferential part of one surface of the optical lens 40, an elastic member 30 interposed between the support section 23 and the optical lens 40, and a lens fastener 50 disposed in the lens holder 20 so as to be movable along an optical axis of the optical lens 40, and holding the optical lens 40 by clamping the optical lens 40 jointly with the lens holder 20. The lens fastener 50 pushes the outer circumferential part of the other surface of the optical lens 40, thereby to deform the elastic member 30 to adjust the position of a focal point of the optical lens 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical lens unit, and more particularly to an optical lens focal position adjustment mechanism in an optical lens unit mounted on a portable communication device.

  Recent progress in portable imaging devices and mobile communication devices is remarkable. Currently, with the expansion of the information transmission capacity of mobile communication devices, development of mobile communication devices such as mobile phones equipped with imaging devices is underway. This realizes a mobile phone not only as a voice communication device but also as an imaging device and a communication device for the image. There is an optical lens unit as an indispensable part for the imaging device, and it is incorporated on the image sensor. In a camera that connects an image through a lens system, it is indispensable to adjust the lens so that the imaging surface comes to the light receiving surface of the image sensor. A configuration of a conventional optical lens unit will be described with reference to FIG. FIG. 22 is a cross-sectional configuration diagram of the optical lens unit.

  As shown in the figure, the optical lens unit 200 includes a lens holder 210, an optical lens 220, a lens holder 230, and an optical lens mounting ring 240.

  The lens holder 210 has a cylindrical shape, and a thread groove 250 is formed on the inner wall.

  The lens retainer 230 has a cylindrical shape in which a part of the outer peripheral wall is in contact with the inner peripheral wall of the lens holder 210, and a screw groove 260 is formed on the outer wall thereof, and is fitted to the screw groove 250 of the lens holder 210. is doing. The lens retainer 230 is a movable mechanism that can move in the lens holder 210 in the direction along the optical axis 4 by the screw-type rotation of the thread grooves 250 and 260. By providing a focus adjustment mechanism in a very small range, it is possible to adjust the focal position deviation due to variations in focal length due to lens molding and flange back variations during assembly.

  The optical lens 220 has an edge, and the edge is held and fixed by being sandwiched between the lens holder 230 and the optical lens mounting ring 240.

  In the above configuration, the light emitted from the light source 5 is collected by the optical lens 220 and forms an image on the imaging surface. Further, the optical lens 220 fixedly held by the lens presser 230 and the optical lens mounting ring 240 is moved in the direction along the optical axis 4 in the lens holder 210 by the movable mechanism. In this way, adjustment can be performed after the optical lens unit is assembled to the sensor, so that a low-cost manufacturing method that does not require high assembly accuracy can be applied. Moreover, high adjustment accuracy of the lens can be achieved by adjusting the focus after assembling the lens.

  Conventionally, in the optical lens unit, the focal position adjustment mechanism of the optical lens as described above has been an essential component. This is because the optical lens has variations in focal length. Optical lenses are generally mass-produced by mold molding. This is a method of manufacturing an optical lens by pouring a heat-melted resin into a mold and gradually cooling the resin. In this method, it is usual to produce a plurality of optical lenses with one mold. By the way, in the mold forming, the characteristics of the optical lens can be improved by increasing the slow cooling time, but this slow cooling time tends to be short from the viewpoint of production efficiency. It is difficult to equalize the cooling environment for each optical lens, and variations in characteristics such as focal length occur. In order to correct this variation in focal length and mounting position variation during assembly, the focal position adjustment mechanism as described above is required.

  As shown in FIG. 22, in the conventional optical lens unit, the focal position adjusting mechanism is configured by screw grooves 250 and 260 provided between the lens holder 230 and the lens holder 210. Then, the optical lens 220 and its holding body are integrally moved. Therefore, it is difficult to reduce the size of the optical lens unit 200. Further, as the number of parts for configuring such a movable mechanism increases, the assembly accuracy may deteriorate. Furthermore, a sliding portion between the screw groove 250 and the screw groove 260 exists in the lens holder 210, which is a space connecting the optical lens and the imaging surface. For this reason, the rubbing dust generated at the sliding portion may adversely affect the image formed on the imaging surface.

  The present invention provides an optical lens unit that can be miniaturized by simplifying the lens focal position adjusting mechanism.

  An optical lens unit according to an aspect of the present invention includes an optical lens that collects light, a cylindrical lens holder that has a support portion that supports an outer peripheral portion of one surface of the optical lens on an inner peripheral surface, An elastic member interposed between the support portion and the optical lens, having a ring shape and having a sealing property, and being in close contact with the support portion and the optical lens; and in the lens holder, A lens retainer provided so as to be movable along the optical axis direction of the optical lens, and holding the optical lens by sandwiching an outer peripheral portion of the optical lens together with the support portion of the lens holder; and one surface of the lens retainer A lens cover that is in contact with and covers the one opening end of the optical lens, and the lens pressing member presses the outer peripheral portion of the other surface of the optical lens with the other opening end. The elastic member is deformed to control the focal position of the optical lens, and when the lens cover applies a pressing force to the lens holder, the lens holder moves along the optical axis in the lens holder. Therefore, the pressing force to the elastic member is controlled via the optical lens.

  According to the present invention, it is possible to provide an optical lens unit that can be made compact by simplifying the lens focal position adjusting mechanism.

  Embodiments of the present invention will be described below with reference to the drawings. In the description, common parts are denoted by common reference symbols throughout the drawings.

  FIG. 1 is a perspective view of each member constituting an optical lens unit having a focal position adjustment mechanism for an optical lens according to the first embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are optical lenses. It is sectional drawing of a unit.

  As shown in the drawing, the optical lens unit 10 includes a lens holder 20, a cushion material 30 (elastic member), an optical lens 40, and a lens presser 50.

  The lens holder 20 has a cylindrical shape having an opening 21 in a part of the bottom surface, and a thread groove 22 (first thread groove) is formed on the inner wall.

  The cushion material 30 is a black light absorber having a refractive index similar to that of the optical lens 40 and having sealing properties and elasticity, and has a ring shape. The cushion material 30 is provided on the bottom surface (flange surface 23; support portion) of the lens holder 20, and is in close contact with the flange surface 23 due to its sealing property.

  The optical lens 40 is provided on the flange surface 23 of the lens holder 20 so that the edge portion (the outer peripheral portion of one surface) is in contact with the cushion material 30. The optical lens 40 is arranged so that the center portion thereof and the opening 21 of the lens holder 20 are located on the optical axis 1. The cushion material 30 is also in close contact with the edge of the optical lens 40.

  The lens retainer 50 has a cylindrical shape having openings on the upper surface and the bottom surface, and a part of the outer periphery thereof is formed to be equal to the inner periphery of the lens holder 20. A screw groove 51 (second screw groove) that fits into the screw groove 22 of the lens holder 20 is provided on the outer peripheral wall of the lens holder 50. The optical lens 40 is fixed and held by sandwiching the edge of the optical lens 40 between the opening end (one opening end) of the lens presser 50 on the optical lens 40 side and the cushion material 30.

  In the above configuration, the light emitted from the light source 2 is collected by the optical lens 40 and forms an image on the imaging plane 3 through the opening 21 of the lens holder 20. Note that an optical sensor (not shown) is positioned on the image plane 3.

  Next, a method for adjusting the focal position of the optical lens 40 will be described with reference to FIGS. 2A is a cross-sectional view of the optical lens unit when the focal position of the optical lens is moved away, and FIG.

  In order to adjust the focal position, the lens holder 50 is moved with respect to the lens holder 20 in the direction along the optical axis 1 (vertical direction in FIGS. 2A and 2B) by the screw-type rotation mechanism. As shown in FIG. 2A, when the lens presser 50 is pushed into the lens holder 20, the cushion material 30 contracts due to its elastic force. Therefore, the optical lens 40 moves to the flange surface 23 side of the lens holder 20. On the other hand, as shown in FIG. 2B, when the lens presser 50 is pulled out with respect to the lens holder 20, the cushion material 30 expands due to its elastic force. Therefore, the optical lens 40 moves from the flange surface 23 of the lens holder 20 to the lens holding member 50 side. In this way, the focal position of the optical lens 40 can be adjusted.

  In the case of an optical lens unit having an optical lens focal position adjusting mechanism as described above, the lens holder 50 may simply be configured to be able to push in the optical lens 40. That is, it is not necessary to integrally mold the optical lens and its holding body, and specifically, the lens mounting ring in FIG. 22 described in the related art can be omitted. Then, the focal position of the optical lens 40 is adjusted by elastic deformation of the cushion material 30. Therefore, the number of parts of the focal position adjusting mechanism can be reduced, the configuration can be simplified, and the downsizing and assembling process of the optical lens unit can be simplified.

  Further, a cushion material 30 is provided between the optical lens 40 and the flange surface 23 of the lens holder 20. Therefore, it is possible to prevent the rubbing dust generated in the screw grooves 22 and 51 from entering the space connecting the optical lens 40 and the imaging surface. Further, the cushion material 30 is made of a material having a refractive index similar to that of the optical lens 40. Therefore, the stray light that has entered the edge enters the cushion material 30 with almost no reflection at the interface between the optical lens 40 and the cushion material 30. Since the cushion material 30 is also a black light absorber, the stray light incident on the cushion material 30 is absorbed by the cushion material 30. Therefore, it is possible to prevent unnecessary stray light from entering the image plane 3. Further, by reducing false signals such as flare, the contrast of the image formed on the image plane 3 can be improved.

  Next, an optical lens unit according to a second embodiment of the present invention will be described with reference to FIGS. 3, 4A, and 4B. FIG. 3 is a perspective view of each member constituting an optical lens unit having a focal position adjustment mechanism of the optical lens, and FIGS. 4A and 4B are cross-sectional configuration views of the optical lens unit after assembling each member. is there.

  As shown in the figure, the optical lens unit 10 includes a lens holder 20, a cushion material 30, an optical lens 40, a lens holder 50, and a lens cover 60.

  The lens holder 20 has a cylindrical shape having an opening 21 in a part of the bottom surface, and a protrusion 24 is provided on the outer peripheral wall.

  The cushion material 30 is a black light absorber having a refractive index similar to that of the optical lens 40 and having sealing properties and elasticity, and has a ring shape. The cushion material 30 is provided on the bottom surface (flange surface 23) of the lens holder 20, and is in close contact with the flange surface 23 due to its sealing property.

  The optical lens 40 is provided on the flange surface 23 of the lens holder 20 so that the edge portion is in contact with the cushion material 30. The optical lens 40 is arranged so that the center portion thereof and the opening 21 of the lens holder 20 are located on the optical axis. The cushion material 30 is also in close contact with the edge of the optical lens 40.

  The lens retainer 50 has a cylindrical shape, and a groove 54 for sandwiching the lens holder 20 is provided in the wall thereof. Further, a cavity 53 is provided at a position corresponding to the protrusion 24 of the lens holder 20. Further, a protrusion 52 is provided at the opening end (the other opening end) in contact with the lens cover 60. The protrusions 52 are provided to determine the surface direction of the lens cover 60 with respect to the lens holder 50, and at least three protrusions 52 need to be provided.

  The lens cover 60 is a transparent cover that protects the optical lens 40, for example, and is fitted to the protrusion 52 of the lens holder 50.

  As described above, in the optical lens unit 10 according to the present embodiment, the lens holder 50 and the lens holder 20 are not particularly fixed. This optical lens unit 10 has a floating structure in which the lens holder 50 can freely move along the optical axis 1 in a state where the lens holder 20 is sandwiched in the groove 54. The movable range of the lens holder 50 is limited to a range in which the protrusion 24 can move in the cavity 53.

  In the above configuration, the light emitted from the light source 2 enters the optical lens unit 10 via the lens cover 60, is collected by the optical lens 40, passes through the opening 21 of the lens holder 20, and the imaging surface 3 Tie a statue to.

  Next, a method for adjusting the focal position of the optical lens 40 will be described with reference to FIGS. 4 (a) and 4 (b). 4A is a cross-sectional view of the optical lens unit when the focal position of the optical lens is moved away, and FIG.

  In order to adjust the focal position, the lens cover 60 is moved in the direction along the optical axis 1 (the vertical direction in FIGS. 4A and 4B). As shown in FIG. 4A, when the lens cover 60 is pushed into the optical lens 40, the lens presser 50 presses the optical lens 40 against the flange surface 23 side of the lens holder 20 accordingly. This pressing pressure causes the cushion material 30 to contract due to its elastic force. Therefore, the optical lens 40 moves to the flange surface 23 side. Conversely, as shown in FIG. 4B, when the lens cover 60 is moved away from the optical lens 40, the cushion material 30 expands due to its elastic force. As a result, the optical lens 40 moves from the flange surface 23 to the lens cover 60 side. In this way, the focal position of the optical lens in the optical lens unit can be adjusted.

  As described above, the optical lens unit according to the present embodiment adjusts the position of the lens holder 50 on the optical axis in the lens holder 20 by applying a pressing pressure to the lens cover 60. Then, the elastic deformation amount of the cushion material 30 is controlled by pushing or pulling out the lens holder 50 into the lens holder 20, and thus the focal length of the optical lens 40 is adjusted. Therefore, it is not necessary to provide screw grooves in the lens holder 20 and the lens holder 50. By eliminating the screw grooves, the shapes of the lens holder 20 and the lens holder 50 are greatly simplified, and the optical lens unit can be miniaturized. Therefore, the manufacturing process of these members is simplified and the manufacturing cost is reduced. As a result, the manufacturing cost of the optical lens unit can be greatly reduced. Furthermore, since the assembly process is simplified, the assembly accuracy can be improved, and the problem of rubbing debris generated by rubbing the screw grooves can be solved. Further, by providing the projection 52 on the lens holder 50, the pressing pressure applied to the lens cover 60 is applied only to the projection 52. Therefore, it is possible to reduce a load that tends to shift in the lateral direction of the lens holder 50 with respect to the lens cover 60.

  As described above, according to the present embodiment, an optical lens unit that is superior in productivity and image reliability on the imaging surface can be realized.

  Next, an optical lens unit according to a third embodiment of the present invention will be described with reference to FIGS. 5 (a) and 5 (b) and FIGS. 6 (a) and 6 (b). This embodiment uses a spring instead of the cushion material 30 in the second embodiment. Fig.5 (a) is a perspective view of the member which comprises a part of optical lens unit based on this embodiment, FIG.5 (b) is a top view of the lens holder in the optical lens unit shown to Fig.5 (a). 6A and 6B are cross-sectional views of the optical lens unit.

  As illustrated, the optical lens unit 10 according to the present embodiment uses a spring 31 provided on the flange surface 23 of the lens holder 20 instead of the cushion material 30. The spring 31 is, for example, a flap-shaped spring that is a part of the flange surface 23 and protrudes beyond the flange surface 23. The upper end surface of the spring 31 is in contact with the edge of the optical lens 40. As described in the first and second embodiments, the focal position of the optical lens 40 can be adjusted by increasing or decreasing the pressing force applied to the spring 31 by adjusting the pressing force applied to the lens presser 50. (See FIGS. 6A and 6B).

  As described above, according to the present embodiment, since the spring 31 integrally formed with the lens holder 20 is used as the cushion material 30, it is possible to reduce the number of assembly parts of the optical lens unit, simplify the assembly process, and reduce the cost. Can be reduced. In addition, although this embodiment is the structure which replaced the cushion material 30 with the spring 31 in 2nd Embodiment, of course, you may apply to the structure of 1st Embodiment. However, considering the problem of scraps generated in the screw-type rotating mechanism, it is desirable to apply to a structure that does not use a screw (second embodiment).

  Next, an optical lens unit according to a fourth embodiment of the present invention will be described with reference to FIGS. 7, 8A, and 8B. The present embodiment relates to a configuration for controlling the pressing force against the cushion material 30 in the optical lens unit having the focal position adjusting mechanism that does not employ the screw type rotation described in the second embodiment. FIG. 7 is a perspective view of each member constituting the optical lens unit, and FIGS. 8A and 8B are cross-sectional configuration diagrams of the optical lens unit after assembling the members.

  In the second embodiment, a focus adjustment slide plate is further provided in the second embodiment, and the lens cover and the focus adjustment slide plate are used as a lens focus position adjustment mechanism.

  As shown in the drawing, an optical lens 40 is placed on the flange surface 23 of the lens holder 20 with a cushion material 30 interposed therebetween, and the edge of the optical lens 40 is sandwiched with the flange surface 23 of the lens holder 20. In this way, the lens holder 50 is provided. A lens cover 60 is provided on the lens retainer 50, and the lens cover 60 and the lens retainer 50 are fitted by a protrusion 52.

  In the lens cover 60, a surface 61 (one surface) in contact with the lens holder 50 has a perpendicular line parallel to the optical axis 1 of the optical lens 40. On the other hand, the opposite surface 62 (the other surface) is inclined such that its perpendicular has a predetermined angle with respect to the optical axis 1.

  On the lens cover 60, a focus adjustment slide plate 63 is provided so that one surface is in contact with the surface 62 of the lens cover 60. The surface 64 of the focus adjustment slide plate 63 that contacts the lens cover 60 is also provided with the same inclination as the surface 62 of the lens cover 60.

  In the above configuration, the light emitted from the light source 2 enters the optical lens unit 10 via the focus adjustment slide plate 63 and the lens cover 60. The incident light is collected by the optical lens 40 and forms an image on the imaging plane 3 through the opening 21 of the lens holder 20.

  Next, a method for adjusting the focal position of the optical lens 40 will be described with reference to FIGS. FIG. 8A is a cross-sectional view of the optical lens unit when the focal position of the optical lens is moved away, and FIG.

  The focus position is adjusted by moving the focus adjustment slide plate 63 in a direction perpendicular to the optical axis 1 (the left-right direction in FIGS. 8A and 8B). When the focus adjustment slide plate 63 having an inclination on the surface 64 in contact with the lens cover 60 moves in parallel, a pressing force is generated in the lens cover 60 having the same inclination on the surface 62 in contact with the focus adjustment slide plate 63. . Specifically, in FIG. 7, when the focus adjustment slide plate 63 is translated in the right direction, a force that is pressed downward is generated in the lens cover 60 as shown in FIG. 8A. As a result, the lens holder 50 presses the optical lens 40 against the flange surface 23 of the lens holder 20. This pressing pressure causes the cushion material 30 to contract due to its elastic force. Conversely, as shown in FIG. 8B, when the focus adjustment slide plate 63 is translated in the left direction, the pressing force applied to the lens cover 60 is reduced, and the lens cover 60 moves in the upward direction. . Then, the cushion material 30 expands due to its elastic force. As a result, the optical lens 40 moves from the flange surface 23 to the lens cover 60 side. Thus, the cushion member 30 is elastically deformed by the force applied to the lens cover 60, and the position of the optical lens 40 in the direction along the optical axis 1 can be adjusted.

  According to the configuration and the focus position adjustment method as described above, the focus position is adjusted by moving the focus adjustment slide plate 63 in a direction orthogonal to the optical axis 1. Therefore, the focal position of the optical lens can be finely adjusted by reducing the inclination angle of the surfaces 62 and 64.

  In this embodiment, a window for allowing light to pass is provided in the focus adjustment slide plate 63. However, if the focus adjustment slide plate 63 is made of a material transparent to light, it is not necessary to provide this window.

  7 and 8A and 8B show the configuration of the optical lens unit using the cushion material 30. FIG. However, as shown in the cross-sectional view of the optical lens unit in FIG. 9, the present embodiment can be applied to the configuration using the spring 31 as described in the third embodiment.

  Next, an optical lens unit according to a fifth embodiment of the present invention will be described with reference to FIGS. 10 and 11A and 11B. Similar to the fourth embodiment, this embodiment also relates to a technique for controlling the pressing force against the cushion material 30 in an optical lens having a focal position adjustment mechanism that does not employ screw rotation. FIG. 10 is a perspective view of each member constituting the optical lens unit, and FIGS. 11A and 11B are cross-sectional views of the optical lens unit after assembling the members.

  In the present embodiment, instead of changing the lateral movement to the pressing force as in the fourth embodiment, the rotational movement is converted to the pressing force.

  As shown in the figure, the lens holder 20 has a cylindrical shape having an opening 21 in a part of the bottom surface. And the inclination 27-1-27-3 (1st protrusion) along the circumferential direction is formed in three places of the opening end (one opening end) of an upper surface.

  The cushion material 30 is a black light absorber having a refractive index similar to that of the optical lens 40 and having sealing properties and elasticity, and has a ring shape. The cushion material 30 is provided on the bottom surface (flange surface 23) of the lens holder 20, and is in close contact with the flange surface 23 due to its sealing property.

  The optical lens 40 is provided on the flange surface 23 of the lens holder 20 so that the edge portion is in contact with the cushion material 30. The optical lens 40 is arranged so that the center portion thereof and the opening 21 of the lens holder 20 are located on the optical axis 1. The cushion material 30 is also in close contact with the edge of the optical lens 40.

  The lens retainer 50 has a cylindrical shape, and has at least two outer peripheral portions (a first outer peripheral portion 55 and a second outer peripheral portion 56). The first outer peripheral portion 55 has an outer periphery equal to the inner periphery of the lens holder 20, with the lower surface opening end (one opening end) being in contact with the edge of the optical lens 40. The lower surface of the second outer peripheral portion 56 abuts on the upper surface opening end (one opening end) of the lens holder 20. The portion of the second outer peripheral portion 56 that contacts the upper opening end of the lens holder 20 is provided with three inclinations 57-1 to 57-3 along the circumferential direction (in FIG. -1 and 57-2 are shown; the second protrusions) are provided so as to correspond to the inclinations 27-1 to 27-3 of the lens holder 20. The optical axis 1 exists in a cylindrical cavity formed in the lens holder 50. The lens pressing member 50 and the cushion material 30 on the flange surface 23 of the lens holder 20 sandwich, fix, and hold the peripheral portion of the optical lens 40.

  In the above configuration, the incident light is collected by the optical lens 40 and forms an image on the imaging surface 3 through the opening 21 of the lens holder 20.

  Next, a method for adjusting the focal position of the optical lens 40 will be described with reference to FIGS. FIG. 11A is a cross-sectional view of the optical lens unit when the focal position of the optical lens is moved away, and FIG.

  In order to adjust the focal position, the lens holder 50 is rotated along the circumferential direction with the second outer peripheral portion 56 in contact with the upper surface opening end of the lens holder 20. As a result, the lens holder 50 is moved in the direction along the optical axis 1 with respect to the lens holder 20. FIG. 11A shows a state where the focal position of the optical lens 40 is moved away. For example, each of the inclinations 27-1 to 27-3 of the lens holder 20 is brought into contact with the entire surface of the inclinations 57-1 to 57-3 of the lens holder 50. Then, since the lens holder 50 is pushed into the lens holder 20, the cushion material 30 contracts due to its elastic force. Therefore, the optical lens 40 moves to the flange surface 23 side of the lens holder 20. Assume that the lens retainer 50 is rotated counterclockwise in the state shown in FIG. FIG. 11B shows this state. When the lens holder 20 is rotated counterclockwise, the region where the inclinations 27-1 to 27-3 of the lens holder 20 and the inclinations 57-1 to 57-3 of the lens holder 50 are in contact with each other is reduced. Drawn from. As a result, the cushion material 30 expands due to its elastic force. Therefore, the optical lens 40 moves from the flange surface 23 of the lens holder 20 to the lens holding member 50 side. In this way, the focal position of the optical lens in the optical lens unit can be adjusted.

  The pressing force on the cushion material 30 can also be controlled by the method as described above. Needless to say, the present invention can also be applied to an optical lens unit having a configuration in which a spring 31 is used instead of the cushion member 30 as shown in FIG.

  Next, an optical lens unit according to a sixth embodiment of the present invention will be described with reference to FIGS. 13, 14A and 14B. FIG. 13 is a perspective view of each member constituting an optical lens unit having a focal position adjustment mechanism of the optical lens, and FIGS. 14A and 14B are cross-sectional configuration views of the optical lens unit after assembling each member. is there.

  This embodiment is an optical lens that can adjust the focal position of an optical lens without using an elastic member (cushion material 30, spring 31 or the like) and without using a screw-type rotation mechanism as in the first to fifth embodiments. The unit will be described.

  As illustrated, the optical lens unit 10 includes a lens holder 20, an optical lens 40, and a lens holder 50.

  The lens holder 20 has a cylindrical portion having an opening 21 through which the optical axis 1 passes through a part of the bottom surface 23 (flange surface 23; support portion). The bottom surface has three slopes 25-1 to 25-3 (second protrusions) along the circumferential direction.

  The optical lens 40 has an edge and is provided on the flange surface 23 in the cylinder of the lens holder 20. On the surface (one surface) in contact with the flange surface 23 of the edge of the optical lens 40, three inclinations 41-1 to 41-3 (first protrusions) along the circumferential direction are provided to the lens holder 20. Are provided so as to correspond to the inclinations 25-1 to 25-3. In addition, three protrusions 42-1 to 42-3 are provided on the surface of the edge that does not contact the flange surface 23 at substantially equal intervals. Then, the optical lens 40 is placed in the lens holder 20 so that the inclinations 41-1 to 41-3 of the optical lens 40 abut on the inclinations 25-1 to 25-3 of the lens holder 20, respectively.

  The lens retainer 50 has an opening formed in a region where the optical axis exists, and is fitted to the protrusions 42-1 to 42-3 of the optical lens 40.

  In the above configuration, the light emitted from the light source 2 is collected by the optical lens 40 and forms an image on the imaging plane 3 through the opening 21 of the lens holder 20.

  Next, a method for adjusting the focal position of the optical lens 40 will be described with reference to FIGS. 14 (a) and 14 (b). FIG. 14A is a cross-sectional view of the optical lens unit when the focal position of the optical lens is moved away, and FIG.

  The focal position is adjusted by rotating the lens retainer 50 along its circumferential direction. When the lens presser 50 is rotated, the optical lens 40 is similarly driven in the lens holder 20 because it is fitted to the protrusions 42-1 to 42-3. In this way, the optical lens 40 is moved in the direction along the optical axis 1 with respect to the lens holder 20 by rotating along the circumferential direction while the optical lens 40 is in contact with the flange surface 23. . FIG. 14A shows a state in which the focal position is moved away. For example, it is assumed that each of the inclinations 41-1 to 41-3 of the optical lens 40 comes into contact with the inclinations 25-1 to 25-3 of the lens holder 20. Then, the optical lens 40 is pushed into the lens holder 20. Assume that the lens retainer 50 is rotated clockwise in the state shown in FIG. FIG. 14B shows this state. By rotating the lens clockwise, the region where the inclinations 25-1 to 25-3 of the lens holder 20 and the inclinations 41-1 to 41-3 of the optical lens 40 abut each other becomes smaller. Drawn from. In this way, the focal position of the optical lens in the optical lens unit can be adjusted.

  According to the above configuration and method, since the elastic member is not used, the configuration of the optical lens unit can be further simplified. Therefore, the manufacturing cost of the optical lens unit can be reduced, and the assembly accuracy can be improved.

  Next, an optical lens unit according to a seventh embodiment of the present invention is described with reference to FIGS. FIG. 15 is a perspective view of each member constituting an optical lens unit having a focal position adjustment mechanism of the optical lens, and FIG. 16 is a diagram of members constituting the optical lens unit when FIG. 15 is viewed from different angles. It is a one part perspective view.

  Depending on the application, an optical filter that cuts or passes a certain wavelength region may be used for the optical lens unit. In the sixth embodiment, such an optical filter is housed in an optical lens unit in the sixth embodiment.

  As shown in the figure, the lens holder 20 includes a cylindrical portion having an opening (not shown) through which the optical axis 1 passes in a part of the bottom surface 23. The bottom surface (flange surface 23) covers the opening. ) Is provided with an optical filter 26. In addition, slopes 25-1 to 25-4 along the circumferential direction are provided in four regions of the flange surface 23 that become empty regions when the optical filter 26 is disposed on the flange surface 23.

  At the edge of the optical lens 40, there are four inclinations corresponding to the inclinations 25-1 to 25-4 of the lens holder 20 (in FIGS. 15 and 16, only three inclinations 41-1 to 41-3 are shown for convenience of drawing). Is provided).

  As described above, the effect of providing the four inclinations 25-1 to 25-4 in the empty area of the flange surface 23 will be described below.

  Although it is common practice to use an optical filter for an optical lens unit, a normal optical filter is manufactured in a square shape. Therefore, in view of cost, it is preferable to use an optical filter having a square shape also in the optical lens unit. For example, if a circular shape matching the flange surface 23 of the lens holder 20 is used, an optical filter must be manufactured particularly for an optical lens, which increases costs.

  Further, it is not desirable that the optical filter is provided in a region between the lens holder 20 and the imaging plane 3. This is because the end face of the optical filter can be a place where dust is generated. Therefore, the optical filter needs to be provided outside the space where the imaging surface exists, in other words, the optical sensor exists.

  Therefore, in the present embodiment, first, the square optical filter 26 is disposed on the flange surface 23. Then, an inclination is provided in an empty area where the optical filter 26 and the flange surface 23 do not overlap. Then, the number of inclinations is inevitably 4 places. As a result, the above two requirements can be satisfied.

  In addition, the inclination and the number of the inclination in the optical lens unit according to the present embodiment are determined according to the shape of the optical filter. Therefore, as described above, it is the most preferable embodiment to use the square optical filter to provide four slopes in the four empty areas, but the present invention is not limited to this case.

  Next, an optical lens unit according to an eighth embodiment of the present invention will be described with reference to FIGS. 17, 18A and 18B. FIG. 17 is a perspective view of each member constituting an optical lens unit having a focal position adjusting mechanism of the optical lens, and FIGS. 18A and 18B are sectional configuration views thereof. In this embodiment, one optical lens is added to the seventh embodiment.

  As shown in the drawing, the lens holder 20 includes a cylindrical portion having an opening 21 through which the optical axis 1 passes through a part of the bottom surface 23. An optical filter 26 is provided on the bottom surface (flange surface 23) so as to cover the opening 21. The four protrusions 25-1 to 25-4 are provided on the flange surface 23 so as to surround the optical filter 26.

  The optical lens 40 (second optical lens) has an edge. Further, four inclinations are provided at the edge of the optical lens 40 (in FIG. 17, only three inclinations 41-1 to 41-3 are shown for convenience of drawing). These four inclinations are in contact with the protrusions 25-1 to 25-4 of the lens holder 20, respectively. Furthermore, a guide 45 (second guide) is provided on the surface of the edge of the optical lens 40 opposite to the flange surface 23. The central axis of the guide 45 is formed so as to coincide with the optical axis of the optical lens 40. Further, projections 47-1 to 47-3 (first projections) as illustrated are provided at three locations on the outer wall of the guide 45. Further, three protrusions 46-1 to 46-3 (second protrusions) are provided on the edge of the optical lens 40 so as to surround the guide 45.

  The optical lens 90 (first optical lens) is provided on the optical lens 40 so that their optical axes coincide with each other. The optical lens 90 has an edge. Three inclinations 91-1 to 91-3 (first guide) are provided on the edge. These three inclinations are in contact with the protrusions 46-1 to 46-3 of the optical lens 40, respectively. Further, as shown in FIG. 18A, the inclinations 91-1 to 91-3 of the lens 90 are provided only at the outer edge of the edge. That is, the inclinations 91-1 to 91-3 are provided so as to protrude from the edge surface (one surface). Further, three protrusions 92-1 to 92-3 are provided on the surface of the edge of the optical lens 90 opposite to the optical lens 40. The optical lens 90 and the optical lens 40 are assembled such that the guide 45 of the optical lens 40 fits inside the slopes 91-1 to 91-3 protruding from the surface of the optical lens 90. At this time, since the guide 45 is provided with acute-angle protrusions 47-1 to 47-3 on the outer periphery thereof, the guide 45 and the inner periphery of the inclinations 91-1 to 91-3 are not in direct contact with each other. Only the tips of the acute angle protrusions 47-1 to 47-3 are in contact with the inner periphery of the inclinations 91-1 to 91-3. The acute angle protrusions 47-1 to 47-3 are equally arranged in the circumferential direction so that each protrusion has an acute angle, so that deformation at the time of contact starts from a tip portion that is easily deformed by stress. If a biased assembly is performed, a projecting portion with a large amount of deformation is generated. However, since the strain concentrates on the projecting portion with a biased distortion, the repulsive force is increased and automatically adjusted in a direction to correct the deviation.

  The ring 100 is provided between the optical lens 40 and the optical lens 90. The ring 100 is a light absorber and is provided inside the guide 45 of the optical lens 40. The ring 100 is in contact with the optical lenses 40 and 90. Then, the light incident toward the edge of the optical lens 90 is absorbed.

  The lens retainer 50 has an opening formed in a region where the optical axis exists, and is fitted to the protrusions 92-1 to 92-3 of the optical lens 90.

  Adjustment of the focal position in the optical lens unit having the above configuration is performed by the same method as that in the sixth embodiment described with reference to FIGS. In other words, the optical lens 40 moves in the optical axis direction by rotating the four inclinations provided on the edge about the optical axis while contacting the protrusions 25-1 to 25-4 of the lens holder 20. In addition, the optical lens 90 has three inclinations 91-1 to 91-3 provided on the edge rotating around the optical axis while being in contact with the protrusions 46-1 to 46-3 of the optical lens 40. Move in the direction of the optical axis.

  With the optical lens unit having the above configuration, the optical axes of the two optical lenses can be easily adjusted. This is because one optical lens 40 is provided with a guide 45, and the guide 45 is further provided with projections 47-1 to 47-3. This point will be described in detail below.

  The manufacturing process of the optical lens is performed in such a manner that a rough shape of the optical lens is first formed by molding, and then the details of the optical lens are processed using a lathe. The fine processing is, for example, processing of a curved surface of an optical lens or formation of a guide 45. In processing using a lathe, processing is performed while rotating the optical lens around a certain rotation axis, and therefore the rotation axis and the optical axis coincide. Then, the center of the guide 45 formed simultaneously with the curved surface processing or the like coincides with the rotation axis of the lathe, that is, coincides with the optical axis. Therefore, as long as the two optical lenses 40 and 90 are manufactured using the same mold, the optical axes of the optical lenses 40 and 90 should be aligned with each other by assembling the guide 45 together. Thus, by providing the guide 45, the optical axes of the two optical lenses can be easily aligned. This is a great merit particularly in a small optical lens unit. Normally, the optical axes of a plurality of optical lenses in a large optical lens often do not require strict optical axis adjustment because of their gentle curvature. However, in a small optical lens unit, since the curvature of the optical lens is small, the optical performance is remarkably deteriorated by a slight deviation of the optical axis.

  Further, as described above, the guide 45 does not directly contact the inclinations 91-1 to 91-3 of the optical lens 90. The acute angle tips of the protrusions 47-1 to 47-3 provided on the guide 45 are in contact with the inclinations 91-1 to 91-3. Therefore, the stress at the time of fitting between the optical lens 40 and the optical lens 90 can be alleviated by deforming only the sharp end portion of the protrusions 47-1 to 47-3. In the structure in which the guide 45 is in direct contact with the inclinations 91-1 to 91-3, if a large force is applied between the two, distortion occurs in one of them. Then, the guide 45 can no longer play the role of optical axis adjustment. However, if the protrusions 47-1 to 47-3 are provided, the sharp tip portions of the protrusions 47-1 to 47-3 are crushed, so that the distortion can be absorbed, and the light of the two optical lenses 40 and 90 can be absorbed. Axes can be kept in agreement.

  Furthermore, in this embodiment, a ring 100 that is a light absorber is provided between the two optical lenses 40 and 90. The ring 100 absorbs stray light incident on the edge of the optical lens 40. Accordingly, it is possible to remove the influence of stray light on the image formed on the imaging plane.

  As shown in the sectional view of the optical lens unit in FIG. 18B, the protrusions 47-1 to 47-3 are provided on the inner peripheral surfaces of the inclined surfaces 91-1 to 91-3 of the optical lens 90. Also good. In short, the protrusions 47-1 to 47-3 may be provided in a portion of the optical lens 90 that contacts the side surface of the guide 45. Further, the protrusions 46-1 to 46-3 may be provided on the optical lens 90. In this case, the protrusions 46-1 to 46-3 are in contact with the upper surface of the guide 45. Further, it is necessary to provide an inclination such as inclinations 91-1 to 91-3 on the upper surface of the guide 45.

  Further, the protrusions 47-1 to 47-3 are not necessarily required to have an acute angle. It may be obtuse. That is, it is sufficient for the protrusions 47-1 to 47-3 to have a shape with a sharp tip.

  As described in the first to eighth embodiments, according to the present invention, the assembly process is simplified and the optical lens unit is reduced in size by reducing the number of parts constituting the focal position adjusting mechanism. I can do it. That is, as described in the first embodiment, the number of components can be reduced by adopting a configuration in which the focal position is adjusted by the pressing pressure of the cushion member 30 while adopting the screw-type rotation mechanism. Furthermore, the space where the screw is provided and the space where the imaging plane exists can be separated. As a result, it is possible to suppress the dust and screw scraps at the end of the optical filter from entering the surface on which the imaging surface exists, that is, the imaging element surface. Therefore, black scratches and black spot defects caused by these dusts can be suppressed. Further, it is possible to suppress the generation of false signals such as flare and improve the contrast of the image.

  Further, as described in the second embodiment, the screw-type rotation mechanism can be omitted by pushing the lens holding member 50 with the lens cover 60, for example. Since this screw type rotation mechanism can be omitted, the manufacturing cost of the optical lens unit can be greatly reduced. This point will be described with reference to FIGS. 19 (a) and 19 (b). FIG. 19A is a cross-sectional view of a mold necessary for manufacturing one lens holder 20, and FIG. 19B is a perspective view of a mold for manufacturing a plurality of lens holders.

  As shown in FIG. 19A, three molds 110, 120, and 130 are used for manufacturing the lens holder 20. A method for manufacturing a lens holder by molding will be briefly described. First, as shown in FIG. 19A, three molds 110 to 130 are combined. The space formed between these molds is the region that becomes the lens holder 20. In this state, the heated and fluidized material is poured into the gaps of the mold. The fluid material gradually cools while the mold is deprived of heat. Then, after the material poured into the mold is solidified, the molds 110 to 130 are removed. Here, the mold 130 is a mold necessary for creating a space in which the optical lens 40 is set. In the case of an optical lens unit having a conventional screw-type rotation mechanism, a screw groove is provided on the outer periphery of the mold 130. Therefore, if the mold 130 is to be removed after the material poured into the mold is solidified, the mold 130 is pulled out while rotating according to the screw. That is, such a rotation mechanism is essential. However, in this embodiment, the screw type rotation mechanism is omitted. Therefore, there is no need for a screw groove in the mold 130, and in order to remove the mold 130, the mold 130 is simply pulled out. That is, a mechanism for rotating the mold 130 is not required, and not only can the cost required for mold molding be reduced, but also the manufacturing process can be greatly simplified. Further, when the mold 130 provided with the thread groove is pulled out as in the prior art, friction occurs between the mold 130 and the glass or carbon fiber contained in the lens holder material. As a result, the mold is worn and the accuracy of the finished product deteriorates every time it is used repeatedly. In particular, if the screw accuracy is loosened, the lens will loosen in the holder, causing problems such as tilting of the optical axis. However, in this embodiment, the friction between the mold 130 and the material, which is generated when the mold 130 is pulled out, can be greatly reduced, and wear of the mold can be prevented. Therefore, it is possible to manufacture a lens holder with high accuracy.

  In general, a plurality of lens holders are manufactured with one mold. FIG. 19B shows a case where four lens holders are manufactured with one mold. Conventionally, a mechanism for rotating the mold 130 is required at the tip of each mold 130. That is, a space for providing this rotation mechanism is required between adjacent molds 130. However, this mechanism includes a plurality of gears and the like, and it is difficult to reduce the size. Therefore, the interval between adjacent molds 130 cannot be reduced, and the number of lens holders that can be manufactured with one mold is limited. However, in this embodiment, since the rotation mechanism of the mold 130 is unnecessary, the interval between the adjacent molds 130 may be narrower than the conventional one. That is, a single mold can simultaneously manufacture a larger number of lens holders than in the past. Therefore, the cost for manufacturing the lens holder can be reduced.

  Further, if the screw-type rotation mechanism of the lens holder can be omitted, the assembly process of the optical lens unit can be simplified, and variations in characteristics occurring during the assembly can be suppressed. Furthermore, the problem of screw scraps can be solved. By realizing the focal position adjustment mechanism that omits the screws in this way, a great advantage is obtained in terms of the manufacturing surface of the optical lens unit and the focal position adjustment capability of the optical lens unit itself.

  As described in the third embodiment, the spring 31 can be used instead of the cushion material 30. If the spring 31 is integrally formed with the flange 23, the number of parts can be further reduced. Further, the alternative to the cushion material 30 is not limited as long as it has elasticity. Here, the material of the elastic member will be described. As the elastic member, it is desirable to use an elastic member that is a black light absorber having the same refractive index as that of the optical lens unit as described above. As a result, stray light or the like can be prevented from adversely affecting the image formed on the imaging plane. Specific examples of this material include rubber, resin, and spring. It is desirable to use a material having an elastic deformation ratio of the elastic member to the lens holder 50 of 1:10 to 1: 100 or more, that is, an elastic deformation ratio of 1/10 to 1/100 or less. In this case, only the elastic member can be elastically deformed substantially when the lens presser 50 is moved for focus position adjustment. This is because the elastic deformation of the optical lens 40 can be minimized, and the reliability of the image connected by the optical lens unit can be improved.

  As a technique for fixing the optical component, there is a case where a spring-like ring having elasticity is used on a surface to which the optical component is attached. Such a ring is mainly used for a flat filter or the like whose fixing position is not important. However, the purpose is to alleviate the mounting pressure on the filter mounting parts, and the adjustment of the focal position of the optical lens is not a problem.

  Further, unlike the spring-like attachment ring used in the above-described planar filter, the cushion material in the present embodiment plays a role of blocking the space surrounded by the optical lens and the imaging plane from the outside. At the same time, the pressing force is evenly applied to the peripheral portion of the optical lens, which contributes to the improvement of the focus adjustment function of the optical lens unit and the improvement of the reliability of the image connected by the optical lens unit.

  Further, as described in the fourth and fifth embodiments, the parallel operation and the rotation operation are performed by the inclination provided on the lens cover 60 and the focus adjustment slide plate 63 and the inclination provided on the lens holder 20 and the lens holding member 50. The focal length can be finely adjusted by converting the pressing force of the lens presser 50 into the lens holder 20.

  The imaging diameter of an image sensor used in a mobile device such as a mobile phone has been reduced year by year. It is not preferable to directly apply a load to the optical lens used in such a micro optical system, which may damage the optical lens. However, as described in the fourth and fifth embodiments, the optical lens 40 is not pressed directly, but the slide of the focus adjustment slide plate and the rotation of the lens presser 50 are converted into a pressing force. By doing so, the load on the optical lens can be reduced. “Focus position adjustment” as used in this specification does not focus on focus adjustment for each shooting performed by a normal camera, but the manufacturing variation of lenses, that is, daily molding conditions, The main focus is on adjustments for correcting differences in molding pieces, optical characteristics variations such as molding material lot variations, or lens mounting variations with respect to the image sensor. The focus adjustment mechanism is effective in manufacturing a camera module in which a lens unit is mounted on an image sensor. In other words, it is because the mounting accuracy up to the lens mounting can be realized with a cheaper mounting apparatus by adjusting the focus variation due to the manufacturing and mounting last. In addition, the focal length of the lens used in the image sensor and its movement amount are short. Therefore, the range of the focal position adjustment is sufficiently sufficient for the elastic deformation of the elastic member (cushion material 30, spring 31, etc.). This adjustment range is, for example, about several μm to several tens of μm. Furthermore, as described above, in a micro optical system used in a portable device, a plurality of lens groups are rarely used, and a monocular lens is generally used. Therefore, in the first to seventh embodiments, the optical lens unit having one optical lens has been described. However, even an image sensor used in a portable device may use an optical lens group including a plurality of optical lenses. The present invention can also be applied to such an optical lens unit. FIG. 20 shows this example. As shown in the figure, two optical lenses 43 and 44 are held by a holding member 70, and the two optical lenses 43 and 44 operate as a unit. Further description will be made by paying attention to the optical lens, and the present invention is naturally applied even when an optical lens having no edge is used. FIG. 21A is a perspective view of each member constituting an optical lens unit using an optical lens having no edge, and FIG. 21B is a cross-sectional view of the optical lens unit after assembling each member. is there. As shown in the drawing, the holding member 80 holds the peripheral portion of the optical lens 40 having no edge so as to sandwich it. The holding member 80 is in contact with the cushion material 30 and the lens presser 50. As described above, the present invention can be applied even to a lens having no edge, and the present invention can also be applied to an optical lens unit having a plurality of optical lenses.

  Further, in the sixth and seventh embodiments, the inclination described in the fifth embodiment is provided on the flange surface 23 of the lens holder 20 and the optical lens 40. Then, the focal position of the optical lens 40 is directly adjusted by the rotation of the flange surface 23 and the optical lens 40. Therefore, there is no need to provide an elastic member, and the number of parts constituting the optical lens can be further reduced. Further, when an optical filter is inserted, a generally used square shape can be used.

  Further, in the eighth embodiment, two optical lenses 40 and 90 are mounted on the optical lens unit. One optical lens 40 is provided with a guide 45 having a central axis equal to the optical axis, and the optical lens 40 and the optical lens 90 are combined using the guide 45. Therefore, the optical axes of the two optical lenses can be easily adjusted. Further, the guide 45 is not in direct contact with the inclinations 91-1 to 91-3 of the optical lens 90, and the protrusions 47-1 to 47-3 provided on the guide 45 are inclined to the inclinations 91-1 to 91-3. Direct contact. Therefore, the stress between the optical lens 40 and the optical lens 90 can be relaxed.

  Note that the method of pressing the elastic member is not limited to the methods described in the first to fifth embodiments. In the sixth embodiment, the inclinations 41-1 to 41-3 have been described as being integrated with the optical lens. However, it goes without saying that the optical lens unit may be configured with the inclined portion as another member. Various modifications are possible.

  In the fifth to seventh embodiments, the optical lens is moved in the optical axis direction by rotating one of the two inclined surfaces with respect to the optical axis while making contact with each other. However, as described in the eighth embodiment, the same action can be obtained even if one inclined surface is a simple protrusion. Conversely, the protrusions 25-1 to 25-4 and 46-1 to 46-3 in the eighth embodiment may be formed to have the same inclination as the inclination provided on the edge of the optical lenses 40 and 90. .

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

1 is a perspective view of an optical lens unit according to a first embodiment of the present invention. 2A and 2B are cross-sectional views of the optical lens unit shown in FIG. 1, in which FIG. 1A is a cross-sectional view when the focal position is moved away, and FIG. The perspective view of the optical lens unit which concerns on 2nd Embodiment of this invention. 4A and 4B are cross-sectional views of the optical lens unit shown in FIG. 3, wherein FIG. 5A is a cross-sectional view when the focal position is moved away, and FIG. The optical lens unit which concerns on 3rd Embodiment of this invention is shown, (a) A figure is a partial perspective view, (b) A figure is a top view of a lens holder. FIG. 7A is a cross-sectional view of the optical lens unit shown in FIG. 6, and FIG. 7A is a cross-sectional view when the focal position is moved away, and FIG. The perspective view of the optical lens unit which concerns on 4th Embodiment of this invention. 8A is a cross-sectional view of the optical lens unit shown in FIG. 7, and FIG. 8A is a cross-sectional view when the focal position is moved away, and FIG. Sectional drawing of the optical lens unit which concerns on the modification of the 4th Embodiment of this invention. The perspective view of the optical lens unit which concerns on 5th Embodiment of this invention. FIG. 11 is a cross-sectional view of the optical lens unit shown in FIG. 10, where (a) is a cross-sectional view when the focal position is moved away; The perspective view of the optical lens unit which concerns on the modification of the 5th Embodiment of this invention. The perspective view of the optical lens unit which concerns on 6th Embodiment of this invention. FIG. 14A is a cross-sectional view of the optical lens unit shown in FIG. 13, and FIG. 14A is a cross-sectional view when the focal position is moved away, and FIG. The perspective view of the optical lens unit which concerns on 7th Embodiment of this invention. The partial perspective view of the optical lens unit which concerns on 7th Embodiment of this invention. The perspective view of the optical lens unit which concerns on 8th Embodiment of this invention. FIG. 18A is a cross-sectional view of the optical lens unit shown in FIG. 17, and FIG. 18A is a cross-sectional view when the focal position is moved away, and FIG. It is a figure which shows the metal mold | die for manufacturing the lens holder of the optical lens unit which concerns on the 2nd thru | or 8th embodiment of this invention, (a) A figure is sectional drawing of the metal mold | die which manufactures one lens holder, (B) The figure is a perspective view of the metal mold | die for manufacturing several lens holders. Sectional drawing of the optical lens unit which concerns on the 1st modification of 1st thru | or 8th embodiment of this invention. It is a figure which shows the optical lens unit according to the 2nd modification of 1st thru | or 8th embodiment of this invention, (a) A figure is a perspective view, (b) A figure is sectional drawing. Sectional drawing of the conventional optical lens unit.

Explanation of symbols

  1, 4 ... Optical axis, 2, 5 ... Light source, 3 ... Imaging plane, 10, 200 ... Optical lens unit, 20, 210 ... Lens holder, 21 ... Opening, 22, 51, 250, 260 ... Screw groove, 23 ... Flange surface, 24, 52, 42-1 to 42-3, 46-1 to 46-3, 47-1 to 47-3, 92-1 to 92-3 ... Protrusions, 25-1 to 25-4, 27-1 to 27-3, 41-1 to 41-3, 57-1 to 57-3, 91-1 to 91-3 ... Inclined, 26 ... Optical filter, 30 ... Cushion material, 31 ... Spring, 40, 43, 44, 90, 220 ... optical lens, 45 ... guide, 50, 230 ... lens holder, 53 ... cavity, 54 ... groove, 55, 56 ... outer periphery, 60 ... lens cover, 61, 62, 64 ... surface, 63: Focus adjustment slide plate, 70, 80 ... Holding member, 100 ... Ring, 110-130 ... Mold, 240 ... Optical lens mounting ring

Claims (3)

An optical lens that collects the light;
A cylindrical lens holder having a support portion supporting an outer peripheral portion of one surface of the optical lens on an inner peripheral surface;
An elastic member interposed between the support portion and the optical lens, having a ring shape and having a sealing property, and being in close contact with the support portion and the optical lens;
A lens holder that is provided in the lens holder so as to be movable along the optical axis direction of the optical lens, and holds the optical lens by sandwiching the outer periphery of the optical lens together with the support portion of the lens holder;
A lens cover that is in contact with one opening end of the lens holder and covers the opening, and the lens holder has an outer peripheral portion of the other surface of the optical lens as the other opening. Deform the elastic member by pressing at the end to control the focal position of the optical lens;
When the lens cover applies a pressing force to the lens holder, the lens holder moves along the optical axis in the lens holder, and thus controls the pressing force to the elastic member via the optical lens. An optical lens unit. Provided on the other surface of the lens cover that is inclined with respect to a surface perpendicular to the optical axis, and further provided with a focus adjustment slide plate having the same inclination as the lens cover on a surface in contact with the lens cover;
When the focus adjustment slide plate moves in parallel with respect to a plane perpendicular to the optical axis, a pressing force is applied to the lens holder via the lens cover, so that the lens holder moves in the lens holder through the optical axis. The optical lens unit according to claim 1, wherein the pressing force to the elastic member is controlled via the optical lens. 2. The optical lens unit according to claim 1, wherein the elastic member has an elastic deformation rate higher than that of the lens holder, and an elastic deformation ratio with the lens holder is 1:10 to 1: 100.

Images