JP2016080736A - Lens barrel and optical device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a simple configuration to perform a separation-prevention of a roller and the like implementing a thrust regulation of a zoom ring.SOLUTION: By pressing-in, a press-in part 72b of a zoom ring roller 72 and a press-n part 71a of an inner zoom ring 71 stay stationary without looseness in a radial direction of the zoom ring roller 72. In a state where the zoom ring roller 72 is completely pressed in, an abutting part 72d is abutted against an abutting part 71d of the inner zoom ring 71. In this case, a burr section 72a rides over the press-in part 71a of the inner zoom ring 71. The burr part 72a has a face that vertically rises at θ1=90 degrees from a face of a press-in part 72b side, which in turn prevents the zoom ring roller 72 from being separated.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a lens barrel and an optical apparatus using the same.

  Patent Document 1 relates to the incorporation of a back piece for performing thrust regulation of an operation member (zoom ring). First, the back piece is formed into a stepped shape and assembled inside the operation member. In this state, the operation member is assembled into the fixed frame to prevent the operation member from coming off, and the thrust of the operation member is stably controlled.

JP 2000-27596 A

  However, the configuration of Patent Document 1 must incorporate a stepped-shaped play piece from the inside of the operation member and be able to be incorporated in the fixed frame in that state, which is a great limitation in terms of assembly and configuration. End up. If the thrust restricting roller is simply incorporated from the outside, another restricting member or adhesion is required to prevent the roller from coming off, resulting in an increase in size and cost of the apparatus.

The optical instrument of the present invention is
Koro and
A fixing member for fixing the roller and having a press-fitting portion with the roller;
The roller has a sliding member that slides and moves relatively,
The roller is a press-fit portion that is press-fitted and fixed to the fixed portion;
A sliding portion sliding with the sliding member;
It has a joint part and a burr part that prevent it from being sandwiched from both sides of the press-fitting part,
When the slope angle on the press-fitting part side of the burrs is θ1, and the slope angle on the opposite side is θ2, θ1> θ2.

  According to the optical apparatus of the present invention, it is possible to prevent the zoom ring thrust regulating roller from coming off without performing any special additional parts or bonding, thereby reducing costs and downsizing the apparatus.

It is sectional drawing of the imaging system of this embodiment. It is a system block diagram of the imaging system shown in FIG. It is the figure which looked at the 1st group unit from the sensor side. FIG. 4 is a view of the first group unit viewed from the arrow C side in FIG. 3. BB sectional drawing of FIG. The figure which showed the zoom ring roller. Cross section of zoom ring roller using part in optical axis direction Cross section of the zoom ring using the optical axis Assembly drawing of zoom ring roller. Another embodiment of the zoom ring roller. Assembly drawing of zoom ring roller. The optical axis direction sectional view of a 1st group roller use part. Example of using conventional 1 group rollers.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Example 1]
FIG. 1 is a cross-sectional view of an imaging system (optical apparatus) that includes an interchangeable lens 200 and a camera body 500. The interchangeable lens (lens unit) 200 is an optical device configured to be detachable from the camera body 500. The camera body 500 is configured as a single-lens reflex camera (optical device) in the present embodiment, but may be configured as a mirrorless camera. The present invention is applicable not only to digital still cameras but also to digital video cameras and lens-integrated cameras.

  The interchangeable lens 200 has a photographing optical system that forms an optical image of a subject. The photographing optical system according to the present embodiment includes a first group lens 1, a second group lens 3, a third group lens 5, an anti-vibration lens 7, a focus lens 9, a fifth group lens 12, and an aperture unit 34. Reference numeral 2 denotes a first group lens barrel that holds the first group lens 1, 17 denotes a first group cylinder that fixes the first group lens barrel, 4 denotes a second group lens barrel that holds the second group lens 3, and 6 denotes a third group lens 5. This is a third group barrel (holding member). The image stabilizing lens 7 corrects image blur by moving in a direction perpendicular to the optical axis, and is held by the image stabilizing device 8. The vibration isolator 8 is fixed to the third group barrel 6.

  Reference numeral 10 denotes a focus lens barrel that holds the focus lens 9 and is moved in the optical axis direction by a guide mechanism and a drive mechanism provided in the fourth group lens barrel 11 to perform focus adjustment. Reference numeral 13 denotes a fifth group barrel that holds the fifth group lens 12. The diaphragm unit 34 adjusts the amount of light and is fixed to the third group barrel 6. Reference numeral 14 denotes a guide tube (guide member), which is provided with a plurality of guide grooves (in this embodiment, parallel to three optical axes in the circumferential direction). When the cam ring 16 rotates, the third group barrel 6 slides along the guide groove and moves in the optical axis direction. It is assumed that the guide tube 14 is fixed. Further, the guide tube 14 is fitted to the cam ring 16 on the outer periphery thereof and slides with respect to the cam ring 16.

  A cam ring (cam member) 16 is rotatably fitted to the outer periphery of the guide cylinder 14. A plurality of cam grooves 1 are provided in the circumferential direction of the cam ring 16 (in the present embodiment, three in total in the circumferential direction for each lens in 12 positions). 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 appearance ring, and 32 is a mount. The mount 32 is screwed to the fixed barrel 23. The appearance ring 27 is fixed between the fixed barrel 23 and the mount 32. Reference numeral 19 denotes a manual focus ring (MF) unit, which is supported so as to be rotatable about a fixed barrel 23.

  When the MF unit 19 is rotated, the rotation is detected by a sensor (not shown), and manual focus adjustment is performed according to the rotation amount. Reference numeral 33 denotes a contact block, which is connected to the printed circuit board 31 by wiring (not shown) (FPC or the like) and fixed to the mount 32 with screws. The interchangeable lens 200 is bayonet-fixed to the camera body 500 with 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 element mounted on the camera body 500, which is a photoelectric conversion element such as a CMOS or CCD that photoelectrically converts an optical image formed by the photographing optical system.

  FIG. 2 is a block diagram illustrating an electrical configuration of the imaging system. Reference numeral 501 denotes a camera CPU (camera control means) constituted by a microcomputer, which controls the operation of each unit in the camera body 500. The camera CPU 501 communicates with the lens CPU 201 (lens control means) of the interchangeable lens 200 via the electrical contacts 502 and 202 when the interchangeable lens 200 is mounted. Information (signals) transmitted from the camera CPU 501 to the lens CPU 201 includes drive amount information, parallel shake information, and out-of-focus information of the focus lens 9. 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. Based on the focus detection result (defocus amount and defocus direction) by the focus detection unit 506, the camera CPU 501 drives the focus lens 9 and the focus lens barrel 10 to obtain the in-focus state (including the drive direction). ).

  Information on the driving amount (focus lens driving amount information) is transmitted to the lens CPU 201. The lens CPU 201 controls the operation of each component of the interchangeable lens 200. The camera CPU 501 controls image stabilization by the image stabilization device 8. When the ON signal from the second stroke switch SW2 is input, the camera CPU 501 transmits an aperture drive command to the lens CPU 201 to set an aperture value via the aperture unit 34. Further, the camera CPU 501 transmits an exposure start command to the exposure unit 507, causes the mirror (not shown) to be retracted and the shutter (not shown) to be opened, and exposes the imaging unit 508 including the imaging element 600.

  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, subjected to various correction processes, and 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 the MF unit 19 and its rotation detection unit. 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 anti-vibration device drive unit, which includes a drive actuator of the anti-vibration device 8 that performs an anti-vibration operation and a drive circuit thereof.

  Reference numeral 209 denotes an AF driving unit that performs AF driving of the focus lens barrel 10 through an AF motor in accordance with focus lens driving amount information transmitted from the camera CPU 501. Reference numeral 208 denotes an electromagnetic aperture drive unit, which is controlled by the lens CPU 201 that has received an aperture drive command from the camera CPU 501 to operate the aperture unit 34 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). Further, the lens CPU 201 controls the image stabilization device driving unit 206 based on the combined displacement amount of the angle shake amount and the parallel shake amount to shift the moving group 700 of the image stabilization device 8 to perform the angle shake correction and the parallel shake correction. I do. Further, the lens CPU 201 controls the AF driving unit 209 based on the focus shift amount to drive the focus lens barrel 10 in the optical axis direction to perform focus adjustment.

  Energization of detection signals such as zoom, focus, and anti-vibration operations from the detection means to the lens CPU 201 and control signals from the lens CPU 201 to each actuator is performed by FPC. From now on, the left side (front side) of FIG. 1 will be referred to as the object side, and the right side (rear side) of FIG.

  FIG. 3 is a diagram showing a first group unit. FIG. 4 is a diagram of the first group unit viewed from the arrow C side in FIG. 5 is a cross-sectional view taken along the line BB of FIG. The configuration of the first group unit will be described using these. A mask 70 determines a group of openings. The light beam emitted from the first group is limited by the opening 70d. Further, by covering the back side of the first lens group 1 with the mask 70, it also plays the role of maintaining the aesthetics seen from the front side. Reference numeral 2a denotes a male thread portion of the first group barrel 2. Reference numeral 17 e denotes a female screw portion of the first group cylinder 17. The first group barrel 2 is fixed to the first group cylinder 17 by screwing the male screw portion 2a and the female screw portion 17e. Next, the incorporation of the mask 70 into the first group barrel 2 will be described.

  In the mask 70, 70a is a bayonet claw portion, 70b is a press-fitting projection portion, 70c is an engagement claw, and 70d is a relief portion. 2b of the first group barrel 2 is a fitting part, 2c is an engaging part, and 2d is a notch part. The mask 70 is incorporated into the first group barrel 2 from the sensor side in a phase where the escape portion 70d and the fitting portion 2b of the first group barrel 2 are combined. Thereafter, when viewed from the direction of FIG. 3, the mask 70 is bayonet-coupled to the first group barrel 2 by rotating the mask 70 counterclockwise.

  Specifically, the three bayonet claw portions 70a are similarly fitted into the three fitting portions 2b. At this time, the press fitting protrusion 70b provided on the bayonet claw 70a is press-fitted and fixed to the fitting portion 2b, and the mask 70 is fixed without play in the optical axis direction. Regarding the restriction of the rotation direction, when the bayonet is coupled, the engaging claw 70c rides on the engaging portion 2c and is fixed while being urged so as to prevent reverse rotation. Thereby, the mask 70 can be held in the first group barrel 2 without backlash.

  The first group barrel 2 is made by resin molding, and it is necessary to make a shape that sandwiches a bayonet claw like the fitting portion 2b with a mold. For example, there is a method of forming a fitting portion by making a hole from the object side of the first group barrel 2, but the object side of the first group barrel 2 is an appearance surface, and it is not possible to make unnecessary holes because the appearance is impaired. Can not. Reference numeral 2e denotes a parting line of the first group barrel 2, and a mold slide is formed in the direction of the arrow. The male screw portion 2a is formed by this slide. At the same time, the fitting part 2b is also formed through a through hole like the notch part 2b. Thereby, the fitting part 2b can be formed, without adding a slide newly and without making an unnecessary hole in an external appearance surface.

  As described above, the mask 70 can be fixed to the first group barrel 2 without any backlash, and no additional parts such as an adhesive or a screw are required, thereby contributing to downsizing and cost reduction. The shape of the mask 70 such as the bayonet claw 70a and the engagement claw 70c is accommodated in the male screw portion 2a with respect to the length in the optical axis direction, and can be made compact. The first group barrel 2 is fixed to the first group cylinder 17 while being screwed. If there is a protrusion such as a screw on the mask 70a, all phases must be escaped to escape when screwed. . Otherwise, the mask 70 will interfere with the second group barrel 4. In the present embodiment, the mask 70 is configured without protruding, and even when screwed and fixed, the interference does not occur and the apparatus is downsized.

FIG. 6 shows the zoom ring roller 72. The role of the zoom ring roller will be described with reference to FIGS. The inner side of the manual zoom ring 35 is fixed and integrated with an inner zoom ring 71 adhesive. 71b is a press-fit portion, 71d is a contact portion, and 71e is a groove portion. A zoom ring roller 72 has a cylindrical shape. 72a is a burring portion, 72b is a press-fitting portion, 72c is a fitting portion, and 72d is a contact portion. 23c of the fixed barrel 23 is a circumferential groove.

  The inner zoom ring 71 is rotatably fitted to the fixed barrel 23 in a diameter. Further, the fixed barrel 35 is provided with a mechanical end for limiting the rotation of the inner zoom ring 71, thereby defining the rotation amount from the zoom TELE to the WIDE. The zoom ring roller 72 has a role of regulating the movement of the inner zoom ring 71 in the optical axis direction with respect to the fixed barrel 23. Here, the installation method will be described. The inner zoom ring 71 is inserted into the fixed barrel 23 from the object side to the use position shown in FIG. In this state, as shown in FIG. 9, the zoom ring roller 72 is inserted from the outside of the inner zoom ring 71. As shown in FIG. 7, the zoom ring roller 72 is integrally fixed to the inner zoom ring 71.

  The circumferential groove 23 of the fixed barrel 23 has a groove shape having a certain width in the optical axis direction and expanding in the circumferential direction. As shown in FIG. 8, the zoom ring roller 72, its attaching portion, and the circumferential groove 23c are provided at approximately three locations in the circumferential direction. The engagement portion 72c of the zoom ring roller 72 is engaged with the circumferential groove 23c, whereby the zoom ring inner 71 is restricted from moving in the optical axis direction and is held rotatably. As described above, by rotating the manual zoom ring 35 fixed integrally with the inner zoom ring 71, the rotation rotates the cam ring integrally through a connecting member (not shown). As a result, each lens group is driven to perform a zoom operation.

  The fixing of the zoom ring roller 72 to the inner zoom ring 71 will be described in detail. The zoom ring roller 72 has a burring portion 72 a, which has a larger diameter than the press-fit portion 71 a of the inner zoom ring 71. Therefore, when inserting, it passes through the press-fit portion 71a while being deformed. Here, as shown in FIG. 6, the angle formed by the press-fit portion 72b side of the burrs 72a is θ1, and the angle formed by the opposite surface is θ2. θ1> θ2 is set, and in this embodiment, θ1 = 90 degrees and θ2 = 25 degrees. Since the burrs 72a are provided with slopes having an angle θ2 that is gentle for introduction, they can pass smoothly during insertion.

  In the fixed state, the press-fitting portion 72b of the zoom ring roller 72 and the press-fitting portion 71a of the inner zoom ring 71 are fixed without play in the radial direction of the zoom ring roller 72 by press-fitting. With the zoom ring roller 72 pushed in, the contact portion 72d and the contact portion 72d of the inner zoom ring 71 are abutted. At this time, the burring portion 72 a gets over the press-fitting portion 71 a of the inner zoom ring 71. The burring portion 72a has a surface that rises perpendicularly by θ1 = 90 degrees from the surface on the press-fitting portion 72b side, thereby preventing the zoom ring roller 72 from coming off. Since the fixed barrel 23 has the chamfered portion 23d, it plays a role of escaping from the burrs and prevents interference.

  As described above, the zoom ring roller 72 is fixed to the inner zoom ring 71 and is prevented from being easily detached. Conventionally, there is a case where it does not have a burr portion 72a and is fixed only by press-fitting, but in this case, the zoom ring roller 72 is detached due to impact or the like, and as a result, the thrust direction of the manual zoom ring 35 It will be loose. As another measure for preventing detachment, there is a method of stopping with an adhesive, but in this case, the operation becomes complicated and the cost increases. In this embodiment, the zoom ring roller 72 uses POM as a material in order to improve the slidability with the circumferential groove 72c. Since this material does not have good adhesion of the adhesive, a sufficient holding power cannot be obtained by bonding.

  Therefore, according to the present embodiment, it is possible to prevent the zoom ring roller from coming off by a simple method without providing an additional fixing member, resulting in cost reduction of the apparatus. When disassembly is necessary, the zoom ring inner 71 is provided with a groove 71e. Therefore, the zoom ring roller 72 can be removed by inserting forceps in the groove and applying force in the direction of disassembly. Will not be damaged.

[Example 2]
9 and 10 show a zoom ring roller according to the second embodiment. Descriptions common to those in the first embodiment are omitted, and only changed portions are described. Reference numeral 172 denotes a zoom ring roller, and reference numeral 171 denotes an inner zoom ring, which corresponds to the first embodiment. 171b is a press-fitting portion, 171d is a contact portion, and 171e is a groove portion. 172a is a burring portion, 172b is a press-fitting portion, 172c is a fitting portion, 172d is a contact portion, and 172g is a parting line. The difference from the first embodiment is that flat portions 171f and 172f are provided. In Example 1, the zoom ring roller is produced by cutting with a resin material POM.

  If this is made by resin molding using a mold, the cost can be reduced. In the shape of the first embodiment, when the mold is divided in the axial direction of the zoom ring roller 72, the burrs 72a are undercut and cannot be created. Moreover, when the parting is provided in the radial direction, a PL step is formed, and the PL step hits the sliding portion depending on the built-in phase.

  Therefore, in this embodiment, a parting line is set as 172g shown in FIG. 10, and the mold is divided in the direction of the arrow. Since the zoom ring roller 172 is incorporated at a phase where the flat surface portion 172f and the flat surface portion 171f are aligned at the time of incorporation, the incorporation phase of the zoom ring roller can be determined. As a result, the fitting portion 172c of the zoom ring roller 172 can also be limited to the top of the arc as shown in FIG. 10, and the dimensions can be easily guaranteed. In the present embodiment, two plane portions 172f are provided in order to determine the phase of incorporation of the zoom ring roller. In addition to the flat portion, a positioning projection shape or the like may be provided.

[Example 3]
FIG. 12 is a view showing the first group cylinder 17 and the first group roller 272. The first group roller 272 has a cylindrical shape and is provided at three locations equally in the circumferential direction. Inside the first group cylinder 17 is a cam ring 16 and further inside is a guide cylinder 16. When the first group roller 172 slides with the rotation of the cam ring in the guide groove parallel to the optical axis of the guide cylinder 14 and the cam groove of the cam ring 16, the first group cylinder 17 is extended. Reference numeral 17b denotes a press-fitting portion, and reference numeral 17d denotes a contact portion. 272a is a burring portion, 272b is a press-fitting portion, 272c is a fitting portion, and 272d is a contact portion.

  The first group roller 272 is fixed to the first group cylinder 17 in the same manner as in the first embodiment. In the fixed state, the press-fit portion 272b of the first group roller 272 and the press-fit portion 17a of the first group cylinder 17 are fixed without play in the radial direction of the first group roller 272. The contact portion 272d and the contact portion 272d of the first group cylinder 17 are abutted with the first group roller 272 being pushed in. At this time, the burring portion 272a gets over the press-fitting portion 17a of the first group cylinder 17. The burr portion 272a has a surface that rises perpendicularly from the surface on the press-fitting portion 272b side, thereby preventing the first group roller 272 from coming off.

  As described above, the present proposal can be applied not only to a roller for a circumferential groove for rotating at a fixed position but also to a roller for sliding with a cam groove and a guide groove. Further, the present invention is not limited to this, and it can also be used for fixing an eccentric roller used for optical adjustment. FIG. 13 is a view showing a conventional fixing method of the first group of rollers. Reference numeral 301 denotes a screw, 302 denotes a roller seat, and 303 denotes a roller cylinder. The roller cylinder 303 and the roller seat 302 are integrated by press-fitting. The roller seat 302 is made of brass and is threaded. As for the assembly into the first group cylinder 317, the roller seat 302 and the roller cylinder 303, which are integrated in advance, are fitted with the guide groove and the cam groove, and the first group cylinder 317 is placed on the outside while being held inside. Cover.

  When the roller seat 302 is in a predetermined position, the roller seat 302 is pulled in from the outside of the first group cylinder 317 and fixed. Such a fixing method increases the number of parts and increases the cost. Also, assembly is very complicated, which limits the shape. In this case, since the first group roller 272 is simply inserted from the outside, it is fixed. Since there is only one part, the cost is reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and change are possible within the range of the summary.

  The present invention can be applied to an optical apparatus such as a lens barrel.

1 1 group lens, 2 1 group lens barrel, 14 guide tube, 16 cam ring, 17 1 group tube,
23 Fixed lens barrel, 35 Manual zoom ring, 70 Mask,
71 Inner zoom ring, 72 Zoom ring roller, 172 Zoom ring roller,
272 Group 1 roller

Claims (3)

Koro,
A fixing member that fixes the roller and has a press-fit portion with the roller;
The roller has a sliding member that slides and moves relatively,
The roller is a press-fit portion that is press-fitted and fixed to the fixed portion,
A sliding portion sliding with the sliding member;
It has a joint part and a burr part that prevent it from being sandwiched from both sides of the press-fitting part,
An optical apparatus characterized in that θ1> θ2 when θ1 is a slope on the press-fit portion side formed with a press-fit portion of the burrs and θ2 is a slope on the opposite side.   The optical apparatus according to claim 1, wherein 45 degrees <θ1 <90 degrees and 0 <θ2 ≦ 45 degrees.   The optical device according to claim 1, wherein the sliding member has a chamfered portion for avoiding interference with a roller burring portion.