JP2016114847A - Lens barrel, and optical device and imaging device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an appearance quality of a lens barrel from being impaired.SOLUTION: A lens barrel having: a plurality of optical members (1001, 1003 and 1004); and a holding frame (2) holding the plurality of optical members has: a light shield member (1002) that is arranged between a first optical member (1001) of the plurality of optical members and a second optical member (1003); and an introduction part (301) that is formed in a second holding part (1003a) holding the second optical member in the holding frame, and is for introducing a fix member fixing the second optical member. In an optical axis direction of the plurality of optical members, the light shield member has: the introduction part; and a protrusion part (1002a) that superposes a first holding part (1001a) holding the first optical member.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a lens barrel, and more particularly to a lens barrel provided with an optical member position adjusting mechanism.

  Conventionally, by decentering or tilting the lens, which is an optical member, with respect to the optical axis, optical performance deterioration due to variations in the position of other lenses, for example, in-focus position shift or frame There is a lens barrel provided with a mechanism for correcting performance such as aberration.

  The lens barrel disclosed in Patent Document 1 has a configuration in which a hole is formed in a lens barrel that holds a lens, and the position of the lens is adjusted by inserting an adjustment jig from there, and the adhesive is fixed after adjustment. It is disclosed. This configuration assumes that the lens cannot be fixed due to space restrictions by the so-called heat caulking method that thermally deforms the lens barrel, and even if there is no need for lens adjustment, the adhesive is put into the lens barrel from the lens barrel hole. The lens can be fixed by pouring.

Japanese Patent Laid-Open No. 7-5352

  However, even when the lens is adjusted, the lens is not adjusted, but simply considering the space-saving and miniaturization of the lens barrel, the adhesive is used when the adhesive is used to fix the lens. The agent may be visible through the lens from the exterior. In that case, since the adhesive can be seen through the lens from the appearance, the quality of the lens barrel may be impaired.

  In view of the above problems, an object of the present invention is to prevent the quality of a lens barrel from being impaired.

  A lens barrel according to one aspect of the present invention is a lens barrel having a plurality of optical members and a holding frame that holds the plurality of optical members, and the first optical among the plurality of optical members. A light-shielding member disposed between the member and the second optical member, and a second holding portion for holding the second optical member in the holding frame, and fixing the second optical member An introduction portion for introducing a member, wherein the light shielding member holds the introduction portion and the first optical member in the holding frame in the optical axis direction of the plurality of optical members. It has the projection part which overlaps with 1 holding | maintenance part, It is characterized by the above-mentioned.

  Other objects and features of the present invention are illustrated in the following examples.

  According to the present invention, it is possible to prevent the quality of the lens barrel from being impaired.

It is sectional drawing of the retracted state of the interchangeable lens by the Example of this invention. It is sectional drawing of the imaging | photography (TELE) state of the interchangeable lens by the Example of this invention. It is sectional drawing of the imaging | photography (WIDE) state of the interchangeable lens by the Example of this invention. It is a 1 group lens unit perspective view of the interchangeable lens by the Example of this invention. It is a system block diagram of an interchangeable lens and a camera body according to an embodiment of the present invention. It is sectional drawing of the 1st group lens unit of the interchangeable lens by the Example of this invention. It is 1st group lens barrel sectional drawing of the interchangeable lens by the Example of this invention. It is a 1 group lens unit detailed enlarged view of the interchangeable lens by the Example of this invention. It is the 1st group lens barrel detailed enlarged view of the interchangeable lens by the Example of this invention. It is a 1st group lens barrel perspective view of an interchangeable lens by the example of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, with reference to FIGS. 1-8, the interchangeable lens 200 which is an optical instrument by the Example of this invention is demonstrated. FIG. 1 is a cross-sectional view of an interchangeable lens 200 according to an embodiment of the present invention. FIG. 1 shows a cross-sectional view of the interchangeable lens 200 in a retracted state whose overall length is shorter than that in the photographing state.

  Reference numeral 1 denotes a first group lens (optical member) constituting a part of the optical system, 2 denotes a first group barrel (lens barrel) that holds the first group lens 1 as a lens holding frame, and 17 denotes The 1st group cylinder which fixes a 1st group barrel is shown. Reference numeral 3 denotes a second group lens constituting a part of the optical system, and reference numeral 4 denotes a second group unit holding the second group lens 3. The second group unit 4 performs an optical image stabilization function for correcting so-called camera shake by moving the second group lens 3 on a plane perpendicular to the optical axis. Reference numeral 5 denotes a third group lens that constitutes a part of the optical system, and reference numeral 6 denotes a third group lens barrel that holds the third group lens 5. Reference numeral 7 denotes a fourth group lens that constitutes a part of the optical system, and reference numeral 8 denotes a fourth group lens barrel that holds the fourth group lens 7, which is fixed to the third group lens barrel 6. Reference numeral 9 denotes a focus lens that constitutes a part of the optical system. Reference numeral 10 denotes a focus lens barrel that holds the focus lens 9. An optical axis is provided by a straight guide mechanism and a drive mechanism (not shown) provided in the third group lens barrel 6. Move in the direction and perform the focusing operation. Reference numeral 11 denotes a fifth group lens constituting a part of the optical system, and reference numeral 12 denotes a fifth group lens barrel that holds the fifth group lens 11. Each lens (optical member) described above is not composed of a single lens but may be composed of a plurality of lenses. However, for the sake of convenience of explanation, the details are omitted. Reference numeral 34 denotes an aperture unit that adjusts the amount of light, and is fixed to the third group barrel 6. After fixing the aperture unit 34, the second group unit 4 is also fixed to the third group barrel 6. The above-described lenses and diaphragm unit 34 constitute a photographing optical system in the interchangeable lens 200 of the present embodiment. Reference numeral 14 denotes a guide cylinder, and 16 denotes a cam ring rotatably fitted on the outer periphery of the guide cylinder 14. Reference numeral 18 denotes a cam ring urging spring that urges the cam ring 16 toward the guide cylinder 14 at a rotational phase position different from the illustrated cross section. Reference numeral 23 denotes a fixed barrel, which fixes the guide tube 14. Reference numeral 31 denotes a printed circuit board on which a lens driving IC, a microcomputer, and the like are arranged, and is fixed to the fixed barrel 23. 27 is an external ring unit, and 32 is a mount. The mount 32 is screwed to the fixed barrel 23. The appearance ring unit 27 is sandwiched and fixed between the fixed barrel 23 and the mount 32. A back cover 36 is fixed to the mount 32. Reference numeral 19 denotes a manual focus ring unit, which is supported so as to be rotatable at a fixed position with the fixed barrel 23 as an axis. When the manual focus ring unit 19 is rotated, the rotation is detected by a sensor (not shown), and the focus lens 9 and the focus lens barrel 10 are driven according to the rotation amount to perform focusing control. The focus lens 9 and the focus lens barrel 10 are supported by a guide mechanism (not shown) so as to advance and retreat along the optical axis. The focus barrel 10 is provided with a nut (not shown) or a so-called rack that is screwed with a screw serving as a rotation shaft of a stepping motor as a focus drive source (not shown). Therefore, when a voltage is applied to a stepping motor (not shown), the screw rotates, the nut and the rack move along the screw, and the focus barrel 10 advances and retreats along the guide mechanism (not shown). In this embodiment, this guide mechanism uses two cylindrical members called optical guides called so-called guide bars, one of which determines the tilt / eccentricity of the focus lens barrel 10 and the other. The focus barrel 10 is supported so as to be able to advance and retract while determining the rotational position. The position reference in the optical axis direction of the focus lens barrel 10 is determined by electrically detecting the light interrupt / transmission switching of a photo interrupter (not shown) by a light shield wall (not shown) attached to the focus lens barrel 10. . Reference numeral 33 denotes a contact block, which is connected to the printed circuit board 31 by wiring (not shown) (flexible circuit board or the like) and fixed to the mount 32 by screws. Reference numeral 500 denotes a camera body which is an image pickup apparatus. The interchangeable lens 200 of this embodiment is bayonet-fixed to the camera body 500 by a mount 32. When the interchangeable lens 200 is fixed to the camera body 500 with the mount 32, the printed circuit board 31 that controls the operation of each lens can communicate with the camera body 500 through the contact block 33. Reference numeral 600 denotes an imaging device mounted on the camera body 500, which is a photoelectric conversion device such as a CMOS or CCD that receives light from a subject that has passed through the interchangeable lens 200 and converts the light into an electrical signal. As described above, the camera body 500 that is an imaging device includes the imaging element 600 that receives light via the interchangeable lens 200 (imaging optical system). In this embodiment, a case where the present invention is applied to an interchangeable lens type imaging apparatus will be described. However, the present invention is not limited to this, and the present invention can also be applied to a lens integrated type imaging apparatus.

  Next, the zoom operation of each lens will be described.

  The first group barrel 2 and the first group cylinder 17 are engaged with the cam ring 16 by a roller (not shown) installed in the first group cylinder 17, and the optical axis direction is accompanied by the rotation of the cam ring 16 around the optical axis. Can be moved to. Reference numeral 28 denotes filtering capable of fixing accessories such as a color filter and a hood, and reference numeral 29 denotes a name ring fixed to the filtering 28. The filtering 28 is screwed to the first group cylinder 17 and moves together with the first group cylinder 17. Reference numeral 15 denotes a first key ring fixed to the object side tip of the guide tube 14. Three projections (not shown) installed on the first key ring 15 are respectively engaged with three linear movement grooves (not shown) installed on the inner surface of the first group cylinder 17 to support the straight movement of the first group cylinder 17. The third group barrel 6 is engaged with the cam ring 16 by a roller (not shown). Accordingly, the third group lens barrel 6 includes the second group unit 4 fixed to the third group lens barrel 6, the aperture unit 34, the fourth group lens barrel 8, the focus lens barrel 10 and its guide mechanism / drive mechanism, and the fifth group lens barrel 12. At the same time, the cam ring 16 can move in the optical axis direction as the cam ring 16 rotates around the optical axis. Reference numeral 13 denotes a second key ring fixed to the third group barrel 6. Three projections (not shown) installed on the second key ring 13 respectively engage with three rectilinear grooves (not shown) installed on the inner surface of the first group cylinder 17 to support the rectilinear movement of the third group lens barrel 6. . A mask 30 is fixed to the second group unit 4 and functions to cut unnecessary light and to blind the internal structure.

  Reference numeral 35 denotes a manual zoom ring, which is rotatably supported by the fixed barrel 23. The cam ring 16 is connected to the manual zoom ring 35 via a roller (not shown) installed on the outer diameter surface, and the cam ring 16 rotates when the photographer rotates the manual zoom ring 35. Although not shown, a cam groove that engages with a roller (not shown) installed in the first group cylinder 17 is installed on the outer surface of the cam ring 16, and installed on the third group lens barrel 6 on the inner surface. A cam groove that engages with a roller (not shown) is provided. These cam grooves rotate the manual zoom ring 35 to change the interchangeable lens 200 from the retracted state of FIG. 1 to the WIDE photographing state of FIG. In the shooting state, each lens has a trajectory that provides an optically desired lens interval between WIDE and the TELE shooting state in FIG. The rotation of the manual zoom ring 35 is detected by a sensor (not shown), and the signal is detected by the IC of the printed circuit board 31 to determine the zoom position according to the amount of rotation, and focus, image stabilization, and aperture control according to the zoom position are performed. Do. The manual zoom ring 35 is provided with a lock mechanism (not shown) so that the manual zoom ring 35 is simply rotated and the camera is not retracted from the photographing state.

  As described above, the interchangeable lens 200 which is an optical apparatus has a plurality of lens barrels (lens barrels) inside thereof, and the optical lens (the optical axis or the central axis of the lens barrel) of the photographing optical system A moving mechanism for moving a plurality of lens barrels is provided.

  FIG. 5 shows the electrical configuration of the camera system (imaging system) of the interchangeable lens 200 that is the optical apparatus of the present embodiment and the camera body 500 that is the imaging apparatus.

  Reference numeral 501 denotes a camera CPU constituted by a microcomputer. The camera CPU 501 controls the operation of each unit in the camera body 500. The camera CPU 501 communicates with the lens CPU 201 provided in the interchangeable lens 200 via the electrical contacts 502 and 202 when the interchangeable lens 200 is mounted. The information (signal) transmitted from the camera CPU 501 to the lens CPU 201 includes focus lens drive amount information, parallel shake information, and focus shake information. The information (signal) transmitted from the lens CPU 201 to the camera CPU 501 includes imaging magnification information. The electrical contacts 502 and 202 include contacts for supplying power from the camera body 500 to the interchangeable lens 200.

  A power switch 503 that can be operated by the photographer is a switch for starting the camera CPU 501 and starting power supply to each actuator, sensor, and the like in the camera system. Reference numeral 504 denotes a release switch that can be operated by the photographer, and includes a first stroke switch SW1 and a second stroke switch SW2. A signal from the release switch 504 is input to the camera CPU 501. The camera CPU 501 enters a shooting preparation state in response to an ON signal input from the first stroke switch SW1. In the shooting preparation state, measurement of subject brightness by the photometry unit 505 and focus detection by the focus detection unit 506 are performed. The camera CPU 501 calculates the aperture value of the aperture unit 34, the exposure amount of the image sensor 600 (in shutter seconds), and the like based on the photometric result. Further, based on focus information (defocus amount and defocus direction) that is a detection result of the focus state of the photographing optical system by the focus detection unit 506, the focus lens 9 and the focus lens barrel 10 for obtaining a focus state with respect to the subject. Drive amount (including the drive direction) is determined. The information on the driving amount (focus lens driving amount information) is transmitted to the lens CPU 201. Furthermore, when the camera CPU 501 enters a predetermined photographing mode, the camera CPU 501 starts shift driving of the second group unit 4, that is, control of the image stabilization operation. The lens CPU 201 controls the operation of each component of the interchangeable lens 200.

  When an ON signal is input from the second stroke switch (SW2), the camera CPU 501 transmits an aperture drive command to the lens CPU 201 to set the aperture unit 34 to the previously calculated aperture value. In addition, the camera CPU 501 transmits an exposure start command to the exposure unit 507 to perform a mirror retracting operation (not shown) and an opening operation of a shutter (not shown), and the imaging unit 508 including the imaging device 600 captures the subject image. Photoelectric conversion, that is, exposure operation is performed.

  An image pickup signal from the image pickup unit 508 (image pickup element 600) is digitally converted by a signal processing unit in the camera CPU 501 and further subjected to various correction processes to be output as an image signal. An image signal (data) is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, or an optical disk in an image recording unit 509.

  Reference numeral 204 denotes an MF ring rotation detection unit, which includes a manual focus ring unit 19 and a sensor (not shown) that detects the rotation.

  Reference numeral 205 denotes a ZOOM ring rotation detection unit, which includes a manual zoom ring 35 and a sensor (not shown) that detects the rotation.

  Reference numeral 206 denotes an IS drive unit, which includes a drive actuator of the second group unit 4 that performs a vibration isolation operation and a drive circuit thereof.

  Reference numeral 209 denotes an AF driving unit that performs AF driving of the focus barrel 10 through an AF motor (not shown) in accordance with focus lens driving amount information transmitted from the camera CPU 501.

  An electromagnetic aperture driving unit 208 is controlled by the lens CPU 201 that has received an aperture driving command from the camera CPU 501 and operates the aperture unit 34 shown in FIG. 1 in an aperture state corresponding to a specified aperture value.

  Reference numeral 211 denotes an angular velocity sensor mounted on the interchangeable lens 200 and connected to the printed circuit board 31. The angular velocity sensor 211 outputs to the lens CPU 201 angular velocity signals indicating respective angular velocities of vertical (pitch direction) shake and lateral (yaw direction) shake, which are angular shakes of the camera system. The lens CPU 201 integrates the pitch velocity and yaw angular velocity signals from the angular velocity sensor 211 electrically or mechanically, and the pitch direction shake amount and the yaw direction shake amount, which are displacement amounts in the respective directions (summarizing them). (Also referred to as angular deflection). Then, the lens CPU 201 controls the IS driving unit 206 based on the above-described combined displacement amount of the angular shake amount and the parallel shake amount to shift-drive the second group unit 4, thereby performing the angular shake correction and the parallel shake correction.

  Further, the lens CPU 201 controls the AF driving unit 209 based on the focus shake amount to drive the focus lens barrel 10 in the optical axis direction and performs focus shake correction.

  Next, an optical adjustment mechanism (position adjustment mechanism) in the lens of the present embodiment will be described.

  The interchangeable lens 200 of this embodiment performs optical adjustment for obtaining desired optical performance by decentering or tilting some lenses or moving them along the optical axis direction. As one of them, when the fourth group barrel 8 supporting the fourth lens 7 is fixed to the third group barrel 6, a washer is sandwiched between the receiving surfaces and the thickness thereof is changed to change the fourth group barrel 8. The thrust position with respect to the third group lens barrel 6, that is, the distance between the lenses supported by each lens barrel is changed. This optical adjustment is an optical adjustment in which the lens and the lens barrel are moved together. However, in some cases, only one of a plurality of lenses supported by the lens barrel may be adjusted in position within the lens barrel and fixed. . The configuration will be described below with reference to FIGS. 4, 6, 7, 8, 9, and 10.

  FIG. 4 is an exploded perspective view of the first group lens 1 composed of a plurality of lenses (optical members) supported by the first group barrel 2. As described above, the first group barrel 2 of the present embodiment is a lens barrel including a plurality of optical members and a holding frame that holds the plurality of optical members.

  Reference numeral 1001 denotes a first lens which is a first optical member. Reference numeral 1003 denotes a second lens which is a second optical member. The first lens 1001 and the second lens 1003 are inserted into the first group barrel 2 from the object side. At this time, a mask 1002 serving as a light shielding member is interposed between the first lens 1001 and the second lens 1003. Reference numeral 1004 denotes a third lens which is a third optical member. The third lens 1004 is inserted into the first group barrel 2 from the image sensor 600 side (image side). As described above, the first group lens 1 described with reference to FIG. 1 (and FIGS. 2 and 3) includes the first lens 1001, the second lens 1003, the mask 1002, and the third lens 1004. The mask 1002 is adjacent to the first lens 1001 and is also adjacent to the second lens 1003. That is, the mask 1002 is disposed between the first lens 1001 and the second lens 1003. The second lens 1003 is adjacent to the third lens 1004. That is, the second lens 1003 is disposed between the first lens 1001 and the third lens 1004. In this embodiment, the smallest outer diameter of the first lens 1001 is larger than the outer diameter of the second lens 1003, and the outer diameter of the second lens 1003 is larger than the outer diameter of the third lens 1004. That is, the outer diameter of the second lens 1003 is smaller than the outer diameter of the first lens 1001, and the outer diameter of the third lens 1004 is smaller than the outer diameter of the second lens 1003. In FIG. 1 (and FIGS. 2 and 3), the first lens 1001, the second lens 1003, the mask 1002, and the third lens 1004 are collectively described as one lens. Reference numeral 1002a denotes mask projections installed on the mask 1002, and is installed at three locations equally 120 ° on the circumference (outer periphery) of the mask 1002.

  6 is a cross-sectional view of the first group lens 1 and the first group lens barrel 2 (lens barrel). The first lens 1001, the mask 1002, the second lens 1003, and the third lens 1004 are inserted into the first group lens barrel 2. The state that has been done. As shown in FIG. 6, the first group lens barrel 2 includes a first holding unit 1001 a that houses and holds the first lens 1001 and the mask 1002. In addition, it has a second holding portion 1003 a that houses and holds the second lens 1003. In addition, a third holding unit 1004 a that stores and holds the third lens 1004 is provided. That is, the first group barrel 2 (holding frame) includes a first holding unit 1001a, a second holding unit 1003a, and a third holding unit 1004a. FIG. 7 is a sectional view of only the first group barrel 2 (holding frame).

  For assembling the first group lens 1, first, the second lens 1003 is inserted, and then inserted until the mask 1002 receives the surface 304. That is, the first group barrel 2 has a step portion between the first holding portion 1001a and the second holding portion 1003a, and the step portion has a receiving surface 304 with which the mask 1002 abuts. Accordingly, the mask 1002 can be easily positioned in the direction in which the central axis of the first group barrel 2 extends. Positioning of the mask 1002 in the eccentric direction depends on the fitting diameter 306 of the first group barrel 2 and the outer diameter of the mask 1002. Here, the mask 1002 is provided with three mask protrusions 1002a having a second outer diameter that is larger than the first outer diameter, and an assembly method thereof will be described later. Next, the first lens 1001 is inserted until it hits the mask 1002, and the first lens 1001 is fixed by so-called heat caulking, in which a part of the first group barrel 2 is deformed by heat. Accordingly, the first lens 1001 is in contact with one surface (first surface) of the mask 1002 while being fixed to the first group barrel 2. The first lens 1001 is positioned in the eccentric direction by fitting the maximum outer diameter of the first lens 1001 and the first group barrel 2. As described above, the third lens 1004 has a fixed aperture 307 which is a fixed aperture portion integrally formed with the first lens barrel 2 between the second lens 1003 and the second lens 1003 from the side opposite to the first lens 1001. Insert into the first group barrel 2 at the pinching position. In other words, when the first lens group 1 is assembled, the fixed diaphragm 307 for restricting the amount of light is disposed between the second lens 1003 and the third lens 1004. Then, the third lens 1004 inserted into the first group barrel 2 is abutted against a predetermined receiving surface installed beside the fixed aperture 307 and the outer diameter is fitted to the first group barrel 2. Positioned and fixed by heat caulking.

  However, the mask 1002 and the second lens 1003 assembled prior to the first lens 1001 have a clearance in the optical axis direction and the eccentric direction with respect to the first lens barrel 2 as shown in FIG. It is not in a state. This is because the position of the second lens 1003 can be adjusted in the eccentric direction. The second lens 1003 is decentered in the direction of the arrow in FIG. 6 while being in contact with the mask 1002, and an adhesive 302 is applied to the adhesive reservoir 301 which is an introduction portion provided in three places in the first lens barrel 2. It is applied and fixed at a desired eccentric position. As described above, the first group lens barrel 2 is provided with the adhesive pool portion 301 (introducing portion) for introducing the adhesive 302 (fixing member) for fixing the second lens 1003 in the first lens barrel 2. The adhesion pool part 301 is formed in the second holding part 1003a that holds the second lens 1003 in the first group barrel 2 (holding frame), and is formed at three positions in the circumferential direction of the holding frame. As will be described later, the mask protrusions 1002a formed at three locations in the circumferential direction of the mask 1002 are arranged so as to correspond to the adhesive pool portions 301 formed at three locations in the circumferential direction of the holding frame. Since the second lens 1003 is in contact with one surface of the mask 1002 (second surface opposite to the first surface) and is adjusted by the adhesive 302 after being adjusted on the second surface, In a state of being fixed to the lens barrel 2, it comes into contact with one surface (second surface) of the mask. Of course, if the adhesive 302 is applied only between the second lens 1003 and the mask 1002, the position of the second lens 1003 cannot be fixed because the mask 1002 is a deformable member. Therefore, the adhesive 302 is attached and applied to both the first group barrel 2 and the second lens 1003, thereby fixing the second lens 1003. The position adjustment of the second lens 1003 is performed so that the optical axis of the second lens 1003 is aligned with the optical axis of the first lens 1001 and the third lens 1004. In this embodiment, it is necessary to adjust only this lens unit in order to obtain desired optical performance as the entire interchangeable lens 200. This position adjustment is performed in a state where the second lens 1003 is pressed against the mask 1002, that is, the first lens 1001, by an adjustment jig (not shown), and the first lens 1001, the third lens 1004, the second lens 1003, The lens interval is made constant. Of course, the position of the second lens 1003 can be adjusted even when the second lens is pressed against the wall of the first lens barrel 2 on the third lens side. However, in the optical system of the present embodiment, the lens distance change between the first lens 1001 and the second lens 1003 has a higher influence on optical performance (so-called sensitivity) than the third lens 1004. Such a configuration is adopted. In addition, the adhesive pool 301 provided near the outer diameter of the second lens 1003 is on the outer side than the outer diameter of the third lens 1004. In other words, the adhesion reservoir 301 of the first group barrel 2 is disposed outside the outer diameter of the third lens 1004 in the direction orthogonal to the central axis of the first group barrel 2. Due to the magnitude relationship of the outer diameters, the adhesive pool 301 having a shape in which the adhesive 302 does not easily protrude outside the first group barrel 2 can be molded.

  Next, FIG. 10 is a perspective view of the first group barrel 2.

  It has been described that an adjustment tool (not shown) is used to adjust the position of the second lens 1003 in the eccentric direction. However, the adjustment tool is provided from three adjustment holes 305 provided in the first group barrel 2. The second lens 1003 is inserted and can be decentered. In other words, the first group barrel 2 further includes an adjustment hole 305 that is a position adjustment unit for adjusting the position of the second lens 1003. In the present embodiment, the adjustment holes 305 are arranged at 120 ° equal divisions that are different from the separately provided adhesive pool 301 in the circumferential direction. That is, the adjustment hole 305 is disposed at a position different from the adhesion pool portion 301 in the circumferential direction of the central axis of the first group barrel 2. Therefore, the bonding work can be performed even when the adjustment tool is in contact with the second lens 1003.

  Next, the incorporation of the mask 1002 and the mask protrusion 1002a will be described with reference to FIGS. FIG. 8 is a detailed enlarged view of a portion B described in the cross-sectional view of FIG. FIG. 9 is an enlarged detail view of a portion D described in the cross-sectional view of FIG.

  As shown in FIG. 9, the first holding portion 1001a has a non-penetrating notch 1001b for accommodating the mask protrusion 1002a on the inner peripheral surface. Further, as shown in FIG. 9, the adhesive pool portion 301 has a through hole 1003 b that penetrates the second holding portion 1003 a. The through hole 1003b is connected to the notch 1001b.

  In the process of assembling the mask 1002 into the first group lens barrel 2, the three mask projections 1002 a that are convex from the fitting diameter 306 and the first outer diameter of the mask 1002 until they are abutted against the receiving surface 304. , While being deformed in the direction opposite to the insertion direction. In other words, the length (second outer diameter) of the portion including the mask projection 1002a of the mask 1002 in the direction orthogonal to the central axis of the first group barrel 2 is the first holding portion 1001a of the first group barrel 2. Is larger than the smallest inner diameter (that is, the fitting diameter 306). Then, when the mask protrusion 1002a is further pressed in a state where the mask 1002 is in contact with the receiving surface 304, the mask protrusion 1002a enters the notch 1001b of the first holding part 1001a. At this time, the bottom part 303 (end part) of the notch 1001b has a shape that bites into the first lens 1001 side (object side) from the receiving surface 304. As a result, the mask 1002 is not deformed as in the case of incorporation. It becomes a state. In other words, the notch 1001b is configured to be able to store the mask protrusion 1002a (part) of the mask 1002, and the mask protrusion 1002a is not deformed when the mask protrusion 1002a is inserted (stored). Can be returned to. The reason why the mask protrusion 1002a enters the adhesive pool portion 301 (notch 1001b) is to prevent the adhesive 302 from flowing into the lens barrel. The mask projection 1002a is larger than the fitting diameter 306 by the illustrated diameter difference, and the gap between the first lens 1001 and the fitting diameter 306 is overlapped, and the adhesive is prevented from entering the gap. That is, the mask 1002 overlaps with the adhesion pool portion 301 and the first holding portion 1001a in the direction in which the central axis of the first group barrel 2 extends (the optical axis direction of the plurality of optical members held by the holding frame). It has a mask protrusion 1002a. By doing so, the contact of the supplied adhesive with the first lens 1001 is reduced. Of course, the mask 1002 can be eliminated, and the second lens 1003 can be directly pressed against the first lens 1001 to adjust the position and can be bonded. However, the first lens 1001 is a lens that is an appearance of the interchangeable lens 200, and the adhesive can be seen through the first lens 1001 and the second lens 1003, which may impair the quality of the interchangeable lens 200. Generally, the vicinity of the outer diameter of the lens is painted black, and the adhesive is difficult to see in the shapes of the first lens 1001 and the second lens 1003 of this embodiment. However, when the adhesive adheres to the black painted surface, the adhered portion may look like a stain on the painted portion from the appearance. Therefore, in this embodiment, because of the appearance quality of the interchangeable lens 200, a mask 1002 that prevents the adhesive 302 from flowing into the lens barrel and hides the adhesive 302 is provided between the first lens 1001 and the second lens 1003. It is arranged. As described above, the mask 1002 is provided between the first lens 1001 and the second lens 1003 as a protective member that reduces the contact of the adhesive 302 introduced from the adhesive reservoir 301 with the first lens 1001. Function.

  In this embodiment, the second lens 1003 is configured to be adjusted by position and fixed by an adhesive, but may not be bonded by an adhesive as long as the second lens 1003 can be fixed. For example, any method can be used as long as the second lens 1003 can be fixed at the position, such as a method of thermally deforming the first lens barrel 2 or a method of filling clay or a material equivalent thereto in the adhesion reservoir. Regardless of the method, the mask 1002 is very effective because it prevents an object having an influence on the appearance from entering the inside of the lens barrel and does not impair the appearance quality.

  As described above, in the present invention, six holes are formed in the side surface of the first group barrel 2 (lens barrel), the jig is inserted from three locations, and the lens position is adjusted. Adhesive is applied from the holes in the place, and the second lens 1003 (adjusting lens) is fixed. At that time, a mask 1002 is arranged on the barrel projection surface of the adjustment lens so as to blind the adhesive so as to prevent the adhesive from being seen from the appearance and to prevent the adhesive from flowing into the lens barrel. To do.

  With such a configuration, it is possible to prevent the lens barrel and optical equipment and imaging apparatus using the lens barrel from being deteriorated in appearance and contribute to downsizing.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. The material is not limited as long as it is a material considering the design function.

  The lens barrel of the present invention can be suitably used for optical devices such as binoculars, microscopes, and projectors, and imaging devices such as compact digital cameras, single-lens reflex cameras, and video cameras.

2: 1 group lens barrel 301: adhesion reservoir 1001: first lens 1001a: first holding unit 1002: mask 1002a: mask protrusion 1003: second lens 1003a: second holding unit

Claims (15)

A plurality of optical members;
A lens barrel having a holding frame for holding the plurality of optical members,
A light shielding member disposed between the first optical member and the second optical member among the plurality of optical members;
An introduction part for introducing a fixing member that is formed in a second holding part for holding the second optical member in the holding frame and fixes the second optical member;
The light-shielding member has a protrusion that overlaps the introduction portion and a first holding portion that holds the first optical member in the holding frame in the optical axis direction of the plurality of optical members. Lens barrel to be used.   2. The lens barrel according to claim 1, wherein the first holding portion stores and holds the light shielding member, and has a notch for storing the protrusion on an inner peripheral surface.   The lens barrel according to claim 1, wherein the first optical member is in contact with a first surface of the light shielding member.   The second optical member is in contact with a second surface of the light shielding member opposite to the first surface, and after being adjusted on the second surface of the light shielding member, is fixed by the fixing member. The lens barrel according to claim 3.   The lens barrel according to claim 2, wherein the introduction part has a through hole that penetrates the second holding part, and the through hole is connected to the notch.   The said holding frame has a step part between the said 1st holding | maintenance part and the said 2nd holding | maintenance part, and has a receiving surface with which the said light-shielding member contacts, The one of Claim 1 thru | or 5 characterized by the above-mentioned. The lens barrel according to item 1. A third optical member adjacent to the second optical member;
The lens barrel according to any one of claims 1 to 6, wherein the second optical member is disposed between the first optical member and the third optical member.   The lens barrel according to claim 7, wherein the holding frame has a fixed aperture portion for regulating the amount of light between the second optical member and the third optical member.   9. The lens barrel according to claim 7, wherein the introduction portion is disposed outside an outer diameter of the third optical member.   10. The lens barrel according to claim 1, further comprising a position adjusting unit for adjusting a position of the second optical member. 11.   The lens barrel according to claim 10, wherein the position adjusting unit is disposed at a position different from the introduction unit in a circumferential direction of a central axis of the lens barrel.   The lens barrel according to any one of claims 1 to 11, wherein the diameter of the first optical member is larger than the diameter of the second optical member.   The lens barrel according to claim 1, wherein the fixing member is an adhesive. The lens barrel according to any one of claims 1 to 13,
A moving mechanism for moving the lens barrel along the optical axis of the lens barrel;
An optical apparatus comprising: The lens barrel according to any one of claims 1 to 13,
An image sensor for receiving light through the lens barrel;
An imaging device comprising: