JP2009175209A - Lens unit, lens device, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the optical performance of a lens unit having a plurality of lenses. <P>SOLUTION: A second lens group 107 having a plurality of lenses on the same light axes is composed by combining a second lens group frame 116 holding a G3 lens 112 and a G04/G05 frame 201 holding a G4 lens 113 and a G5 lens 114. The second lens group frame 116 and the G04/G05 frame 201 have a plurality of projection groups formed on the same circumference around the optical axis to be projected in directions opposite to each other. The projection groups are disposed in contact with each other so as to minimize the inclination of the optical axes of the G3 lens 112 and G4 lens 113, and the G5 lens 114 relative to the optical axis. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens unit including a plurality of lenses provided on the same optical axis, a lens apparatus including the lens unit, and an imaging apparatus including the lens apparatus.

  Conventionally, a lens holding member that holds a lens in a lens barrel is supported by a plurality of support portions, and the distance between the lens frame and the lens barrel is adjusted in the optical axis direction in the remaining support portions except for one support portion. There has been a technique for adjusting the tilt of a lens held by a lens holding member (see, for example, Patent Document 1 below).

  Conventionally, there has been a technique in which adjustment means for moving one lens constituting the group lens with respect to the other lenses in the group lens is provided, and the inclination of the lens with respect to the optical axis is adjusted by the adjustment means. (For example, see Patent Document 2 below.) The adjusting means in this technique rotates in the X-axis direction and the Y-axis direction on a plane perpendicular to the optical axis direction, and rotates to tilt the lens with respect to the optical axis in the X-axis direction and the Y-axis direction, respectively. Adjust independently.

JP 2007-279525 A JP 2002-357755 A

  However, in the conventional techniques including the above-described Patent Document 1, since a plurality of lenses are attached to one lens frame in the lens unit, the parallelism between the lenses is between the lens support surfaces that support each lens in the lens frame. Depends on the parallelism. That is, there is a problem that the parallelism between the lenses is determined only by the manufacturing accuracy of the lens frame, and the optical performance is lowered depending on the manufacturing accuracy of the lens frame.

  Also, the parallelism between lenses tends to decrease as the lens unit components such as lenses and lens frames become smaller when the parallelism deviation between the lens support surfaces is the same. When a lens unit using a conventional technique is mounted on an imaging apparatus such as the above, there is a problem that imaging accuracy is reduced.

  An object of the present invention is to provide a lens unit, a lens apparatus, and an imaging apparatus that can improve the optical performance of a lens unit that includes a plurality of lenses, in order to eliminate the above-described problems caused by the related art. .

  In order to solve the above-described problems and achieve the object, a lens unit according to the present invention is a lens unit including a plurality of lenses provided on the same optical axis, and is an arbitrary one of the plurality of lenses. A first lens frame for holding a lens; a second lens frame for holding a lens different from the arbitrary lens in the plurality of lenses; and the second lens frame in the first lens frame. A first frame abutting member that is provided at a plurality of positions on the same circumference centered on the optical axis and protrudes toward the second lens frame from the end surface of the first lens frame. And a second frame abutting member that is in a position facing the first lens frame in the second lens frame and is in contact with the first frame abutting member, and the first frame The abutting member and the second frame abutting member are arranged on the optical axis. Wherein the inclination quantity of the optical axis of the arbitrary lens and the further lens is configured to abut at least amount becomes combination. According to this invention, by adjusting the combination of the first frame contact member and the second frame contact member, the parallelism can be adjusted after the lens is attached to the lens frame.

  The lens unit according to the present invention is the lens unit according to the first aspect, wherein the first frame contact member is an end of the first frame contact member on the second frame contact member side or the second frame contact member. At least one of the end portions on the side is a plane orthogonal to the optical axis. According to this invention, by managing the parallelism of the plane in at least one of the first frame contact member or the second frame contact member, the combination of the first frame contact member and the second frame contact member is achieved. The parallelism can be adjusted by adjusting.

  In the lens unit according to the present invention as set forth in the invention described above, the first frame contact member and the second frame contact member are in contact with each other outside the outer diameters of the arbitrary lens and the another lens. It is comprised as follows. According to this invention, the parallelism can be adjusted by combining the first frame contact member and the second frame contact member in a range wider than the effective diameter of the lens.

  In the lens unit according to the present invention as set forth in the invention described above, the first frame contact member and the second frame contact member are provided at equal intervals. According to the present invention, the parallelism can be adjusted by combining the first frame contact member and the second frame contact member at an equal position with respect to the optical axis.

  In the lens unit according to the present invention as set forth in the invention described above, the first frame contact member and the second frame contact member are provided at three locations or multiples of three. According to this invention, the first frame contact member and the second frame contact member are brought into contact with each other with equal force at each contact location between the first frame contact member and the second frame contact member. Can do.

  The lens device according to the present invention includes one or a plurality of lens units provided on an optical axis, and makes the light that has passed through the lens unit enter an imaging medium. The lens unit includes a plurality of lenses provided on the same optical axis, a first lens frame that holds an arbitrary lens in the plurality of lenses, and the arbitrary lens in the plurality of lenses. Is provided with a second lens frame for holding another lens, and a plurality of positions on the same circumference centered on the optical axis at positions facing the second lens frame in the first lens frame. A first frame abutting member projecting toward the second lens frame from the end surface of the first lens frame, and a position facing the first lens frame in the second lens frame, First frame rest A second frame abutting member with which the first frame abutting member and the second frame abutting member are in contact with the light of the arbitrary lens and the other lens with respect to the optical axis. It is configured to make contact with a combination that minimizes the amount of tilting of the shaft. According to this invention, a lens apparatus can be comprised using the lens unit which adjusted the parallelism.

  An imaging device according to the present invention is an imaging device including an imaging device and a lens device that causes external light to enter the imaging device, and the lens device is a plurality of lenses provided on the same optical axis. A first lens frame for holding an arbitrary lens; a second lens frame for holding a lens different from the arbitrary lens among the plurality of lenses; and the second lens frame in the first lens frame. A first frame that is provided at a position opposite to the lens frame and is provided on the same circumference centered on the optical axis, and that protrudes toward the second lens frame from the end surface of the first lens frame. A lens unit comprising: an abutting member; and a second frame abutting member that is in a position facing the first lens frame in the second lens frame and is in contact with the first frame abutting member. The lens unit in the lens unit The frame contact member and the second frame contact member are configured to come into contact with a combination that minimizes the amount of tilt of the optical axis of the arbitrary lens and the other lens with respect to the optical axis. And According to the present invention, an imaging apparatus can be configured using a lens apparatus configured using a lens unit with adjusted parallelism.

  According to the lens unit, the lens device, and the imaging device according to the present invention, since the parallelism can be adjusted after the lens is attached to the lens frame, the parallelism of the plurality of lenses in the lens unit can be improved. There is an effect.

  Exemplary embodiments of a lens unit, a lens apparatus, and an imaging apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Schematic configuration of the lens device)
First, a schematic configuration of a lens apparatus according to an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing a schematic configuration of a lens apparatus according to an embodiment of the present invention. In FIG. 1, a lens apparatus 100 according to an embodiment of the present invention includes a lens barrel 101. The lens barrel 101 includes a fixed cylinder 102, a cam cylinder 103, and a rectilinear guide cylinder 104. The fixed cylinder 102 is attached to a mount 105, and is attached to the main body of an imaging device (not shown) via the mount 105.

  An imaging element is disposed in the main body of the imaging apparatus. The image sensor photoelectrically converts external light received through the lens device 100 and outputs an electrical signal corresponding to the amount of incident light. Specifically, the imaging element is realized by, for example, a CCD. The cam cylinder 103 is slidably connected to the fixed cylinder 102 along the axial direction of the optical axis C (hereinafter referred to as “optical axis direction”). Since the configuration in which the cam cylinder 103 is connected to the fixed cylinder 102 so as to be slidable in the optical axis direction is a known technique, description thereof is omitted.

  In the lens barrel 101, a first lens group 106, a second lens group 107, and a third lens group 108 are provided. The first lens group 106 includes a G01 lens 109 and a G02 lens 110, and is connected to the cam cylinder 103 via a first lens group frame 111. The first lens group frame 111 is connected in a state of being suspended from the cam cylinder 103 by a first group cam pin 111 a, so that the first lens group frame 111 is movable in the optical axis direction with respect to the cam cylinder 103. Has been.

  The second lens group 107 includes a G3 lens 112, a G4 lens 113, and a G5 lens 114, and is connected to the cam cylinder 103 via a second lens group frame 116. The second lens group frame 116 is connected in a state suspended from the cam cylinder 103 by a projection 117 provided on the second lens group frame 116, and is thereby movable in the optical axis direction with respect to the cam cylinder 103. Linked in state.

  The configuration in which the first lens group frame 111 and the second lens group frame 116 are connected to the cam cylinder 103 so as to be movable in the optical axis direction can be realized by using various known techniques, and thus description thereof is omitted. The third lens group 108 includes a G6 lens 115. The G6 lens 115 is provided in the lens barrel 101 while being held by a third group frame (focus frame) 115a. The third group frame 115a (G6 lens 115) is connected in a suspended state to a mount or a guide pole (not shown) protruding from the second lens group frame 116, and is driven in the optical axis direction by a drive source such as a motor. It is connected in a movable state.

  In the cam cylinder 103, an iris shutter 118 is provided between the first lens group 106 and the second lens group 107. The iris shutter 118 adjusts the amount of light that passes through the first lens group 106 and enters the second lens group 107. Since the iris shutter 118 can be realized using various known techniques, description thereof is omitted. A plurality of metal rings 119 are provided on the subject side (first lens group 106 side) of the cam cylinder 103. By providing the metal ring 119, the design of the lens device 100 can be improved.

  A lens cover 120 is provided on the subject side of the cam cylinder 103 (on the first lens group 106 side relative to the second lens group 107). The lens cover 120 is driven in conjunction with another lens barrel component. Specifically, the lens cover 120 opens the first lens group 106 to the outside so that an image can be captured, or covers the first lens group 106 to protect the first lens group 106.

  The lens cover 120 includes blades (barriers) for opening the first lens group 106 to the outside and covering the first lens group 106. In FIG. 1, the lens cover 120 is shown in a simplified manner, and blades (barriers) and the like are omitted. Since the lens cover 120 can be realized using various known techniques, description thereof is omitted.

(Configuration of the second lens group)
Next, the second lens group 107 will be described. FIG. 2 is a sectional view showing the second lens group 107, and FIGS. 3 and 4 are exploded perspective views showing the second lens group 107. 3 shows a state in which the second lens group 107 is viewed from the subject side, and FIG. 4 shows a state in which the second lens group 107 is viewed from the third lens group 108 side. In this embodiment, the lens unit of the present invention is realized by the second lens group 107.

  2 to 4, the second lens group 107 includes a second lens group frame 116 as a first lens frame that holds the G3 lens 112, and a G04 / G05 frame 201 that holds the G4 lens 113 and the G5 lens 114. And. In this embodiment, an arbitrary lens is realized by the G3 lens 112, and another lens is realized by the G4 lens 113 and the G5 lens 114.

  The second lens group frame 116 and the G04 / G05 frame 201 are provided separately and are fixed to each other using an adhesive or the like. The second lens group frame 116 includes an opening 301 that allows external light incident on the first lens group 106 to pass to the second lens group 107. The G04 / G05 frame 201 includes an opening 302 through which light that has passed through the first lens group 106 passes to the third lens group 108.

  A concave portion 401 for holding an adhesive is provided at a position facing the G04 / G05 frame 201 in the second lens group frame 116. The G04 / G05 frame 201 includes a comb tooth portion 303 that protrudes toward the second lens group frame 116 at a position facing the recess 401. The second lens group frame 116 and the G04 / G05 frame 201 are fixed by fitting a comb tooth portion 303 into each recess 401 in a state where an adhesive is poured into the recess 401.

  FIG. 5 is a perspective view showing the second lens group 107. FIG. 5 shows a state in which the second lens group 107 is viewed from the third lens group 108 side. As shown in FIG. 5, even when the area of the recess 401 is limited due to the size reduction of the second lens group frame 116 accompanying the size reduction of the lens device 100, the comb tooth portion 303 is provided. Thus, the contact area between the adhesive and the G04 / G05 frame 201 in the adhesive portion 501 can be increased. Thus, the second lens group frame 116 and the G04 / G05 frame 201 can be favorably bonded at the bonding portion 501.

  As an adhesive used for bonding the second lens group frame 116 and the G04 / G05 frame 201, for example, an ultraviolet curable adhesive (UV adhesive) can be used. By providing the comb-tooth portion 303, even when the comb-tooth portion 303 is fitted in each of the recesses 401, the ultraviolet rays can easily circulate around the entire adhesive, thereby the second lens group frame 116 and the G04 / G05 frame 201. Can be bonded well.

  The second lens group frame 116 includes a lens support surface 304 that supports the G3 lens 112. The G3 lens 112 is positioned with respect to the second lens group frame 116 by being brought into contact with the lens support surface 304, and is fixed to the second lens group frame 116 in a state where the G3 lens 112 is positioned with respect to the second lens group frame 116. . The G3 lens 112 is fixed to the second lens group frame 116 using an adhesive (for example, UV adhesive). The fixing of the G3 lens 112 is not limited to adhesion using a UV adhesive, and may be, for example, heat caulking or fusion using laser light.

  The G04 / G05 frame 201 includes a lens support surface 402 that supports the G5 lens 114 in a state where the G4 lens 113 is fixed. The G4 lens 113 and the G5 lens 114 are positioned with respect to the G04 / G05 frame 201 when the G5 lens 114 is brought into contact with the lens support surface 402.

  The G4 lens 113 and the G5 lens 114 are fixed to the G04 / G05 frame 201 while being positioned with respect to the G04 / G05 frame 201. The G5 lens 114 is fixed to the G04 / G05 frame 201 using an adhesive (for example, UV adhesive). The fixing of the G5 lens 114 is not limited to adhesion using a UV adhesive, and may be, for example, heat caulking or fusion using laser light.

  The second lens group frame 116 and the G04 / G05 frame 201 include protrusions 305A, 305B, 305C, 403A, 403B, and 403C provided on the same circumference with the optical axis C as the center. The tips of the protrusions 305A, 305B, 305C, 403A, 403B, and 403C are planes orthogonal to the optical axis.

  In this embodiment, the first frame contact member is realized by the projections 403A, 403B, and 403C provided on the second lens group frame 116, and the first frame contact is realized by the flat surface at the tip of the projections 403A, 403B, and 403C. A plane provided in the member is realized. In this embodiment, the second frame abutting member is realized by the projections 305A, 305B, and 305C provided on the G04 / G05 frame 201, and the second frame is formed by the flat surface of the tip of the projections 305A, 305B, and 305C. A plane provided in the contact member is realized.

  The plane orthogonal to the optical axis may be provided on any one of the protrusions 403A, 403B, and 403C or the protrusions 305A, 305B, and 305C. In this case, the tip of the other projection not provided with a flat surface is, for example, hemispherical such that the projections 403A, 403B, 403C and the projections 305A, 305B, 305C are in point contact.

  The first frame contact member may be realized by the protrusions 305A, 305B, and 305C provided on the G04 / G05 frame 201, and the second frame contact member is the protrusions 403A and 403B provided on the second lens group frame 116. , 403C.

  The second frame contact member is not limited to the protruding shape, and at least the protrusions 403A, 403B, and 403C (or the protrusions 305A, 305B, and 305C) that realize the first frame contact member are the second frame contact members. It only has to protrude toward the. In this case, the second frame contact member may be formed at a position recessed inward along the optical axis direction, or in the optical axis direction with respect to the first frame contact member or the second frame contact member. It may be formed on a flat surface directly opposite to.

  A plurality of protrusions 305A, 305B, 305C, 403A, 403B, and 403C are provided at equal intervals (in this embodiment, at 120 ° intervals) on the same circumference around the optical axis C (three in this embodiment). ) Is provided. Further, the protrusions 305A, 305B, 305C, 403A, 403B, and 403C are provided outside the optically effective effective diameter of the G3 lens 112, the G4 lens 113, and the G5 lens 114 with respect to the optical axis C. .

  The protrusions 403A, 403B, and 403C provided on the second lens group frame 116 are provided so as to protrude toward the G04 / G05 frame 201 side. The protrusions 403A, 403B, and 403C are provided on a plurality (three in this embodiment) of the arm portions 306A, 306B, and 306C that protrude in the radial direction of a circle centered on the optical axis C, respectively.

  In this embodiment, three protrusions 403A, 403B, and 403C are provided on the second lens group frame 116, and three protrusions 305A, 305B, and 305C are provided on the G04 / G05 frame 201. The number of protrusions provided on the second lens group frame 116 and the G04 / G05 frame 201 is not limited to three. The number of protrusions provided on the second lens group frame 116 and the G04 / G05 frame 201 is preferably, for example, three or a multiple of three.

  The number of the protrusions 305A, 305B, 305C, 403A, 403B, and 403C only needs to be provided in at least one of the second lens group frame 116 or the G04 / G05 frame 201. In this case, the other is a multiple of three. It is preferable that Further, in this case, the multiple projections of 3 are such that all the three projections provided on at least one of the second lens group frame 116 or the G04 / G05 frame 201 are always in contact with the projections provided on the other. It is preferable to provide at an interval.

  The projections 305A, 305B, 305C, 403A, 403B, and 403C only need to be provided on the same circumference, and the intervals between the projections 305A, 305B, 305C, 403A, 403B, and 403C may be different. In this case, the intervals between the abutting protrusions on the same circumference around the optical axis C are set to be equal. Further, the number of protrusions provided on the second lens group frame 116 and the number of protrusions provided on the G04 / G05 frame 201 are not limited to the same number, and may be different numbers.

  That is, the number of protrusions provided on the second lens group frame 116 and the number of protrusions provided on the G04 / G05 frame 201 may be different. It is preferable that the number of protrusions is 3 or a multiple of 3 as the number of protrusions provided on at least the second lens group frame 116 or the G04 / G05 frame 201.

  A mark portion 404 is provided on the arm portion 306A on the third lens group 108 side. The mark portion 404 can be realized by, for example, a protrusion protruding from the G04 / G05 frame 201 toward the third lens group 108. Moreover, the mark part 404 may be implement | achieved by the recessed part provided in G04 / G05 frame 201, and may be implement | achieved by marking by a seal | sticker or paint.

  The protrusions 305A, 305B, and 305C provided on the G04 / G05 frame 201 are provided so as to protrude toward the second lens group frame 116 side. The second lens group frame 116 and the G04 / G05 frame 201 are fixed in a state in which the opposing protrusions 305A, 305B, 305C, 403A, 403B, and 403C are in contact with each other.

(Assembly method of the second lens group)
Next, a method for assembling the second lens group 107 will be described. FIGS. 6A and 6B are explanatory diagrams illustrating a method of assembling the second lens group 107. FIGS. FIG. 6A shows a state in which the second lens group 107 is disassembled and viewed from the first lens group 106 side, and FIG. 6-2 shows that the second lens group 107 is disassembled and viewed from the third lens group 108 side. Indicates the state.

  When assembling the second lens group 107, first, the G3 lens 112 is attached to the second lens group frame 116, and on the other hand, the G4 lens 113 and the G5 lens 114 are attached to the G04 / G05 frame 201. Next, the second lens group frame 116 and the projections 403A, 403B, and 403C provided on the second lens group frame 116 and the projections 305A, 305B, and 305C provided on the G04 / G05 frame 201 are opposed to each other. The G04 / G05 frame 201 is opposed.

  When the second lens group frame 116 and the G04 / G05 frame 201 are opposed to each other, the projections 403A, 403B, and 403C provided on the second lens group frame 116 and the projections 305A and 305B provided on the G04 / G05 frame 201 are used. , 305C are opposed to each other multiple times so as to face each other in different combinations. Then, a combination in which the parallelism between the support surface 304 and the support surface 402 is the smallest (close to 0) is selected, and the second lens group frame 116 and the G04 / G05 frame 201 are opposed to each other in the selected combination. And fix.

  When the second lens group frame 116 and the G04 / G05 frame 201 are opposed to each other, the G04 / G05 frame 201 is rotated around the optical axis with respect to the second lens group frame 116. In this embodiment, since the projections 403A, 403B, 403C in the second lens group frame 116 and the three projections 305A, 305B, 305C in the G04 / G05 frame 201 are provided at equal intervals, the second The G04 / G05 frame 201 is rotated 120 degrees around the optical axis with respect to the lens group frame 116.

  The direction of the optical axis of the G3 lens 112 is determined by the support surface 304, and the direction of the optical axis of the G4 lens 113 and the G5 lens 114 is determined by the support surface 402. That is, the parallelism between the G4 lens 113 and the G5 lens 114 and the G3 lens 112 depends on the parallelism between the support surface 304 and the support surface 402.

  In the combination in which the parallelism between the support surface 304 and the support surface 402 is the smallest (close to 0), the second lens group frame 116 and the G04 / G05 frame 201 face each other in the following conditions (1) to (3). Then, the parallelism between the support surface 304 and the support surface 402 in each state is measured, and the parallelism can be the smallest (close to 0).

(1) Combination in which the protrusions 305A and 403A face each other (2) Combination in which the protrusions 305A and 403B face each other (3) Combination in which the protrusions 305A and 403C face each other

  In the case of the combination (1), the protrusion 305B and the protrusion 403B face each other, and the protrusion 305C and the protrusion 403C face each other. In the case of the combination (2), the protrusion 305B and the protrusion 403C face each other, and the protrusion 305C and the protrusion 403A face each other. In the combination (3), the protrusion 305B and the protrusion 403A face each other, and the protrusion 305C and the protrusion 403B face each other.

  When the second lens group frame 116 and the G04 / G05 frame 201 are opposed to each other by the combination of (1) to (3) described above, the second lens group frame 116 is fixed by using a jig or the like. With the position of the lens group frame 116 fixed, the G04 / G05 frame 201 is rotated about the optical axis C so that the position of the mark portion 404 moves.

  By providing the mark portion 404 on the G04 / G05 frame 201, it can be easily confirmed which of the combinations of (1) to (3), so the parallelism of the same combination is measured repeatedly. This eliminates the loss of work time.

  The combination in which the parallelism between the support surface 304 and the support surface 402 is the smallest (close to 0) is used when the lens device 100 or the second lens group 107 is mass-produced, or the production lot of the second lens group frame 116 or G04 / This is performed when the production lot of the G05 frame 201 changes.

  That is, since the combination of the second lens group frame 116 and the G04 / G05 frame 201 in the same production lot can be regarded as almost the same, the production lot of the second lens group frame 116 or the production lot of the G04 / G05 frame 201 is By measuring the parallelism according to the above procedure at the changing timing, it is possible to save time and effort for measuring the parallelism until the production lot of the second lens group frame 116 or the G04 / G05 frame 201 is changed. . Thereby, the mass productivity of the lens device 100 or the second lens group 107 can be improved.

  When assembling the second lens group, after optimizing the parallelism of the lenses (G3 and G4 / G5) by selecting the rotation of the contact surface as described above, the optical axes of G3 and G4 / G5 are then optimized. (Alignment), so-called shift adjustment. Since the shift adjustment is a known technique, a description thereof will be omitted. After the shift adjustment, the second lens group frame 116 and the G04 / G05 frame 201 are adhered and fixed.

  According to this embodiment, since the second lens group is assembled in the above order, shift adjustment can also be performed. Further, the optical performance of the lens device 100 or the second lens group 107 can be improved by performing the shift adjustment together.

  As described above, with regard to the component accuracy (variation) that can be achieved at present, the frame is divided into the second lens group frame 116 and the G04 / G05 frame 201 for the tilting of the optical axis in the same group of small-diameter lenses. By placing the contact surface of the second lens group frame 116 and the G04 / G05 frame 201 outside the lens diameter so that the optimum combination can be selected from a plurality of combinations, the conventional same frame configuration The optical performance can be further improved.

  As described above, according to this embodiment, the direction in which the second lens group frame 116 and the G04 / G05 frame 201 face each other, that is, the protrusions 403A, 403B, 403C, and G04 provided on the second lens group frame 116. G3 lens 112 is attached to second lens group frame 116 by adjusting the combination of protrusions 305A, 305B, and 305C provided on / G05 frame 201, and G4 lens 113 and G5 lens are attached to G04 / G05 frame 201. After mounting 114, the parallelism between the support surface 304 and the support surface 402, that is, the parallelism between the G4 lens 113 and the G5 lens 114 and the G3 lens 112 can be adjusted.

  Accordingly, the combination having the highest parallelism within the measured range can be set as the parallelism of each lens (G3 lens 112, G4 lens 113, and G5 lens 114) in the second lens group 107, so the second lens group. The parallelism of a plurality of lenses (G3 lens 112, G4 lens 113, and G5 lens 114) can be improved. As a result, the optical performance of the second lens group 107 having a plurality of lenses (G3 lens 112, G4 lens 113 and G5 lens 114) can be improved.

  In addition, by configuring the lens apparatus 100 using the second lens group 107 with improved optical performance, it is possible to prevent the optical axis of the lens apparatus 100 from being shifted and to improve the optical performance of the lens apparatus 100. it can. Furthermore, by configuring the imaging apparatus using the lens apparatus 100 with improved optical performance, it is possible to improve the quality of an image captured by the imaging apparatus.

  In addition, according to this embodiment, since the protrusions 305A, 305B, 305C, 403A, 403B, and 403C abut on the outside of the effective diameters of the G3 lens 112, the G4 lens 113, and the G5 lens 114, the G3 lens 112, The parallelism can be adjusted by combining the projections 403A, 403B, and 403C and the projections 305A, 305B, and 305C in a range wider than the diameters of the receiving surfaces of the G4 lens 113 and the G5 lens 114.

  As a result, when the parallelism (variation amount) of the projections of the frame is the same, it is more relative than when the parallelism is adjusted in the same range as the diameters of the receiving surfaces of the G3 lens 112, G4 lens 113, and G5 lens 114 Since the amount of tilting can be reduced, it is possible to suppress the influence caused by the deviation in parallelism (for example, the decrease in optical performance due to the optical axis deviation).

  Further, according to this embodiment, the parallelism can be adjusted by combining the protrusions 403A, 403B, and 403C and the protrusions 305A, 305B, and 305C at equal positions with respect to the optical axis C. This prevents the positional relationship between the second lens group frame 116 and the G04 / G05 frame 201 from being shifted after adjusting the parallelism, and makes the second lens group frame 116 and the G04 / G05 frame 201 stable. It can be made to contact.

  In addition, according to this embodiment, the number of contact portions between the protrusions 403A, 403B, and 403C and the protrusions 305A, 305B, and 305C is set to 3 or a multiple of 3, so that the protrusions 403A and 403B are provided at the contact points. , 403C and the projections 305A, 305B, 305C can be brought into contact with each other with equal force. This prevents the positional relationship between the second lens group frame 116 and the G04 / G05 frame 201 from being shifted after adjusting the parallelism, and makes the second lens group frame 116 and the G04 / G05 frame 201 stable. It can be made to contact.

  As described above, according to the present embodiment, the G3 lens 112 is attached to the second lens group frame 116, the G4 lens 113 and the G5 lens 114 are attached to the G04 / G05 frame 201, and then the G4 lens 113 and G5 are attached. Since the parallelism between the lens 114 and the G3 lens 112 can be adjusted, the parallelism of the plurality of lenses (G3 lens 112, G4 lens 113, and G5 lens 114) in the second lens group can be improved. As a result, the optical performance of the second lens group 107 having a plurality of lenses (G3 lens 112, G4 lens 113 and G5 lens 114) can be improved.

  As described above, the lens unit, the lens device, and the imaging device according to the present invention are useful for a lens unit that includes a plurality of lenses provided on the same optical axis, and in particular, a lens barrel or the like for each lens unit. It is suitable for a lens unit attached to a lens unit, a lens device including the lens unit, and an imaging device including the lens device.

It is sectional drawing which shows schematic structure of the lens apparatus of embodiment concerning this invention. It is sectional drawing which shows a 2nd lens group. It is a disassembled perspective view (the 1) which shows a 2nd lens group. It is a disassembled perspective view (the 2) which shows a 2nd lens group. It is a perspective view which shows a 2nd lens group. It is explanatory drawing (the 1) which shows the assembly method of a 2nd lens group. It is explanatory drawing (the 2) which shows the assembly method of a 2nd lens group.

Explanation of symbols

100 Lens device 107 Second lens group 112 G3 lens 113 G4 lens 114 G5 lens 116 Second lens group frame 201 G04 / G05 frame 305A, 305B, 305C, 403A, 403B, 403C Projection

Claims (7)

A lens unit including a plurality of lenses provided on the same optical axis,
A first lens frame for holding an arbitrary lens among the plurality of lenses;
A second lens frame for holding a lens different from the arbitrary lens among the plurality of lenses;
A plurality of the first lens frames are provided on the same circumference centered on the optical axis at positions facing the second lens frame, and the second lens frame is positioned more than the end surface of the first lens frame. A first frame contact member protruding toward the lens frame side of
A second frame contact member that is in a position facing the first lens frame in the second lens frame and is in contact with the first frame contact member;
With
The first frame contact member and the second frame contact member are configured to contact with a combination that minimizes the amount of tilt of the optical axis of the arbitrary lens and the other lens with respect to the optical axis. A lens unit characterized by that.   At least one of the end of the first frame contact member on the second frame contact member side or the end of the second frame contact member on the first frame contact member side is orthogonal to the optical axis. The lens unit according to claim 1, wherein the lens unit is a flat surface.   The said 1st frame contact member and the said 2nd frame contact member are comprised so that it may contact | abut on the outer side rather than the outer diameter of the said arbitrary lens and said another lens. The lens unit according to 2.   The lens unit according to claim 1, wherein the first frame contact member and the second frame contact member are provided at equal intervals.   The lens unit according to claim 4, wherein the first frame contact member and the second frame contact member are provided at three places or multiples of three places. A lens device that includes one or a plurality of lens units provided on an optical axis, and causes light that has passed through the lens units to enter an imaging medium,
At least one of the lens units includes a plurality of lenses provided on the same optical axis,
A first lens frame for holding an arbitrary lens among the plurality of lenses;
A second lens frame for holding a lens different from the arbitrary lens among the plurality of lenses;
A plurality of the first lens frames are provided on the same circumference centered on the optical axis at positions facing the second lens frame, and the second lens frame is positioned more than the end surface of the first lens frame. A first frame contact member protruding toward the lens frame side of
A second frame contact member that is in a position facing the first lens frame in the second lens frame and is in contact with the first frame contact member;
The first frame contact member and the second frame contact member are configured to contact with a combination that minimizes the amount of tilt of the optical axis of the arbitrary lens and the other lens with respect to the optical axis. A lens device. An imaging device including an imaging device and a lens device that causes external light to enter the imaging device,
The lens device is
A first lens frame for holding an arbitrary lens among a plurality of lenses provided on the same optical axis;
A second lens frame for holding a lens different from the arbitrary lens among the plurality of lenses;
A plurality of the first lens frames are provided on the same circumference centered on the optical axis at positions facing the second lens frame, and the second lens frame is positioned more than the end surface of the first lens frame. A first frame contact member protruding toward the lens frame side of
A lens unit comprising: a second frame abutting member at a position facing the first lens frame in the second lens frame, the second frame abutting member being in contact with the first frame abutting member;
The first frame contact member and the second frame contact member in the lens unit are in contact with a combination that minimizes the amount of tilt of the optical axis of the arbitrary lens and the other lens with respect to the optical axis. An imaging apparatus characterized by being configured.

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