WO2005043211A1 - レンズ鏡筒 - Google Patents
レンズ鏡筒 Download PDFInfo
- Publication number
- WO2005043211A1 WO2005043211A1 PCT/JP2004/015813 JP2004015813W WO2005043211A1 WO 2005043211 A1 WO2005043211 A1 WO 2005043211A1 JP 2004015813 W JP2004015813 W JP 2004015813W WO 2005043211 A1 WO2005043211 A1 WO 2005043211A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- barrel
- focus
- lens
- drive
- cam
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
Definitions
- the present invention relates to a lens barrel that can perform automatic focus adjustment and manual focus adjustment without switching.
- a lens barrel attached to a camera having an AF (automatic focus adjustment) function has an automatic motor and other components to cope with an application that requires focusing on a desired position with respect to a subject.
- a manual focus adjusting means capable of adjusting the focus manually.
- the focus lens can be moved without rotating the manual operation ring for manual focus adjustment at the time of automatic focus adjustment, and the focus lens can be moved by rotating the manual operation ring at the time of manual focus adjustment, Automatic focus adjustment and manual focus adjustment can be performed without switching.
- Patent Document 1 Japanese Patent No. 2721408
- the front focus method in which the front lens group of the zoom lens barrel is a focus lens for performing focus adjustment, once the focus is achieved, the focus position does not change even if the zoom is moved (out of focus). No).
- the focal position changes (out of focus) if the zoom is moved. It is necessary to control the focus lens in conjunction with the zoom position. Therefore, in the AF control, the front focus method has an advantage that the focus lens can be easily controlled as compared with the inner focus method.
- the focus lens adjustment drive range is wider in the front focus method than in the inner focus method, there is a problem that when performing automatic focus adjustment, it takes more time to reach the in-focus state.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lens barrel that can perform automatic focus adjustment and manual focus adjustment without switching by a clutch or the like.
- An object of the present invention is to provide a configuration of a lens barrel that can sometimes eliminate the need for torque adjustment of each unit as in the conventional example.
- Another object of the present invention is to provide a configuration in which automatic focus adjustment can be performed in a short time even when the adjustment drive range (movement range) of the focus lens is wide as in a front focus type zoom lens barrel.
- the present invention relates to a lens barrel
- a drive lens barrel that is rotated by driving a motor that is a drive source of the automatic focus adjustment mechanism and is fixed by stopping the motor;
- An operation ring for manual focus adjustment which is loosely fitted to the outside of the drive lens barrel, is locked with a predetermined locking torque, and is rotatably provided with a torque larger than the locking torque;
- a cam groove is formed for moving the focus lens along the optical axis along with the rotation, and has a cam barrel rotatably provided adjacent to the front side of the drive barrel and the operation ring.
- a planetary gear rotatably supported at the rear end of the cam barrel is engaged with a gear formed at the outer periphery of the front end of the drive barrel and at the inner periphery of the front end of the operating ring, respectively.
- the focus lens becomes It is characterized by being moved along the axial direction.
- the drive barrel of the present invention at the time of automatic focus adjustment, the drive barrel is rotated by driving the motor without rotating the operation ring locked with the predetermined locking torque.
- the focus lens can be moved and the focus ring can be moved by rotating the operation ring with the torque equal to or greater than the above-mentioned locking torque, regardless of the control during or after the automatic focus adjustment control. Adjustment can be performed without switching using a clutch, etc., making it easy to use. Since the rotating force is transmitted through the planetary gears, the torque adjustment of each part as in the conventional example is unnecessary at the time of assembly. It should be noted that the locking torque of the operating ring can be set as desired if the locking member is configured as designed, so that the adjustment is unnecessary. Therefore, assembly can be performed easily.
- the automatic focusing is performed in relation to the range of the focus position due to the shape of the cam groove of the cam barrel and the movement amount of the focus lens according to the amount of rotation of the cam barrel. Adjustments can be made in a short time.
- FIG. 1 is a sectional view showing the structure of a zoom lens barrel according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing a shape of a cam groove of a focus cam barrel of the zoom lens barrel, and the like.
- FIG. 3 is an enlarged sectional view showing a structure around a planetary gear of a zoom lens barrel.
- FIG. 4 is a sectional view taken in the direction of arrow A in FIG. 3.
- FIG. 5 is an explanatory view showing the shape and dimensions of a bar spring.
- FIG. 6 is an explanatory diagram illustrating a zoom operation of a zoom lens barrel.
- FIG. 7A is a front view showing another shape and dimensions of the bar spring.
- FIG. 7B is a top view showing another shape and dimensions of the bar spring.
- FIG. 1 is a cross-sectional view showing the structure of a zoom lens barrel according to an embodiment of the present invention.
- This zoom lens barrel is mounted on a ground with a digital camera (not shown) by a mount 44 provided at the rear end thereof. Connected to the digital camera section of the telescope.
- Reference numeral 1 denotes a fixed main lens barrel, and a focus lens barrel 2 holding a focus lens 2a at an inner peripheral front portion thereof is slidable in the axial direction of the main lens barrel 1, that is, in the optical axis direction. Mated.
- a zoom lens barrel 10 is fitted on the inner periphery of the main barrel 1 behind the focus lens barrel 2, and a zoom lens holding the variable power lenses 4a and 4b is provided on the inner periphery in front of the zoom lens barrel 10.
- a magnification lens holding lens barrel 4 and a correction lens holding lens barrel 7 holding a correction lens 7a are fitted on the rear side so as to be slidable in the optical axis direction.
- a master lens holding barrel 8 holding a master lens 8a and a master lens holding barrel 9 holding a master lens 9a are fixed to the rear end of the main barrel 1.
- the light transmitted through the focus lens 2a, the variable power lenses 4a and 4b, the correction lens 7a, and the master lenses 8a and 9a is split into two by a quick return half mirror (not shown), and one of the light is transmitted and an image sensor (not shown)
- the other is reflected, re-imaged by a relay optical system (not shown), and observed by a user through an eyepiece (not shown).
- a focus cam barrel 15 for moving the focus lens 2a in the optical axis direction is provided at a front portion of the outer periphery of the main barrel 1, and a state (not shown) serving as a driving source of an automatic focus adjustment mechanism is provided behind the focus cam barrel 15.
- AF driving lens barrels 13 that are rotated by bing motors (hereinafter, referred to as AF driving motors) are fitted so as to be rotatable about optical axes.
- the rotation of the AF drive motor (not shown) is transmitted through a gear box (not shown) to a gear portion 13b formed on the outer periphery of the rear end portion of the AF drive lens barrel 13. It is designed to rotate.
- the focus lens 2a is moved along the optical axis direction.
- a substantially spiral cam groove 15a is formed as shown in FIG.
- a linear groove (not shown) is formed along the optical axis in a front part of the main lens barrel 1 which is in contact with the focus cam lens barrel 15, and the focus lens mirror is aligned with the groove and the cam groove 15a.
- the focus cam pin 12 fixed to the outer periphery of the cylinder 2 is engaged.
- the focus cam pin 12 is pressed in the optical axis direction via the cam groove 15a and the linear groove of the main barrel, and the focus lens barrel 2 moves along the optical axis direction. And the focus lens 2a moves!
- a flange 15b is formed at the rear end of the focus cam barrel 15, and planetary gears 37 are provided at three positions on the back surface of the flange 15b, for example. It is rotatably supported by 37a in a direction along the optical axis. Then, as shown in FIGS. 3 and 4, the planetary gear 37 is engaged with a gear portion 13a formed on the outer periphery of the front end of the AF drive lens barrel 13, and is further rotatable outside the AF drive lens barrel 13. A loosely fitted gear portion 19a formed on the inner periphery of the front end of the MF operation ring 19 for manual focus adjustment is formed.
- the MF operation ring 19 has a rear end engaged with a front end of a first exterior barrel 20 that forms a fixing portion of a main body exterior of the zoom lens barrel together with a second exterior barrel 22,
- the engaging portion is pressed by a bar spring 41 and locked with a predetermined locking torque, and can be turned around the optical axis by applying a torque larger than the locking torque.
- the bar spring 41 is formed by thinning a leaf spring into a bar shape, and is formed in a crushed M-shape as shown in FIG. 5, and has an elastic force in the vertical direction of the M-shape.
- the dimensions are, for example, the length of one side of the M character is 410 mm, the angle of bending of each side is 145 °, and the height of the M character is about 3 mm.
- the bar spring 41 is sandwiched between, for example, three places in the circumferential direction between engagement portions (for example, concave and convex portions) between the front end of the first exterior lens barrel 20 and the rear end of the MF operation ring 19.
- the MF operation ring 19 is pressed against the first exterior lens barrel 20 by an elastic force in a direction radiating from the optical axis, and is locked with a predetermined locking torque.
- the locking torque is set by the design of the bar spring 41 so that the planetary gear 37 rotates and the MF operation ring 19 is rotated by the rotation of the AF drive lens barrel 13.
- the bar spring 41 may be curved in an arc shape as a whole, and may be bent in one end into a shape as shown in the drawing. With such a shape, the locking torque is weaker than in the case of the M shape. It can be used properly depending on the use of the lens barrel, the weight of the MF operation ring 19, and the like.
- a zoom operation ring 21 for zoom operation is rotatably fitted on the slightly outer periphery of the rear side of the first exterior lens barrel 20.
- a mounter 44 is fixed to the rear end of the second exterior lens barrel 22.
- the mechanism for performing the zoom operation by operating the zoom operation ring 21 is not related to the features of the present invention, and thus the description thereof will be omitted, and only the outline of the zoom operation will be described later.
- the MF operation ring 19 is manually operated with the AF drive motor (not shown) that drives the AF drive lens barrel 13 turned off and stopped. And rotate it.
- the AF drive motor (not shown) that drives the AF drive lens barrel 13 turned off and stopped.
- the locking of the MF operation ring 19 can be released and the MF operation ring 19 can be rotated.
- the rotating power is transmitted to the planet gear 37 via the gear portion 19a, and the planet gear 37 rotates on its own.
- the AF drive lens 13 is not held (fixed) at a predetermined rotation phase by energization because of the gear ratio of a gear train (not shown) that transmits the power of the AF drive motor to the AF drive motor 13.
- the planetary gear 37 since the planetary gear 37 is fixed so as not to rotate by the rotation of the planetary gear 37, the planetary gear 37 revolves with the rotation.
- the focus cam barrel 15 to which the support shaft 37a of the planetary gear 37 is fixed rotates, and the cam pin 12 is pressed in the optical axis direction through the cam groove 15a and the straight groove of the main barrel, thereby turning the focus lens mirror.
- the cylinder 2 moves along with the focus lens 2a in the optical axis direction.
- the focus lens 2a can be moved back and forth along the optical axis direction to perform focus adjustment.
- the AF drive motor is driven, and its rotational force is transmitted through a gear train (not shown).
- the power is transmitted to the gear portion 13b at the rear end of the lens barrel 13, and the AF drive lens barrel 13 rotates.
- the power is transmitted to the planetary gear 37 via the gear 13a at the front end of the AF drive lens barrel 13, and The star gear 37 rotates.
- the MF operating ring 19 is locked by the bar spring 41, and as described above, the locking torque is adjusted to be stronger than the torque by which the planetary gear 37 rotates the MF operating ring 19 by rotation.
- MF operation ring 19 does not rotate. Therefore, the planetary gear 37 revolves with the rotation, the focus cam barrel 15 rotates as described above, and the focus lens barrel 2 moves along with the focus lens 2a along the optical axis.
- the focus lens 2a is moved to a position at infinity, which is the nearest position (shortest distance) to the focus position, under the control of a control circuit (not shown). Scanning is performed by the detection means aiming at the position with the highest focus evaluation value.
- the adjustment drive range of the focus lens is wider than that of the inner focus type, when performing auto focus adjustment, it takes time to reach the in-focus state. I'll work hard.
- the cam groove 15a of the focus cam barrel 15 has a substantially spiral shape inclined with respect to the axial direction (optical axis direction) of the barrel 15.
- a non-linear shape in which the inclination changes according to the range of the focal position is adopted.
- the focus position is in the range from the nearest (shortest distance) 5 m position to the 20 m position.
- the focus evaluation value is sampled over the entire moving range of the focus lens at the time of automatic focus adjustment, but the focus position and the cam groove of the focus cam barrel 15 are sampled as shown in FIG.
- the relationship with the length of the focus lens movement range in the optical axis direction due to 15a is non-linear, and the length of the movement range from the closest 5m position to the 20m position is the position of the 20m focus position. It is much longer than the length of the movement range from to infinity.
- the shape of the cam groove 15a as described above, it is assumed that the commonly used focal position is the 20m position, and the focal position is the nearest 5m position.
- the rotation direction of the AF drive lens barrel 13 and the MF operation ring 19 is changed.
- the force V causes the revolving speed of the planetary gear 37 to increase synergistically or to be canceled out and slows down depending on whether or not the force V coincides.
- the focus can be adjusted by moving the lens to the MF operation ring 19 and the AF drive motor without any extra load. Therefore, for example, even if the MF operation ring 19 is held, the focus lens can be driven by AF control without rotating it, and the AF mode is turned off after the focus position is determined by AF control. Then, it is possible to easily operate the MF operation ring 19 to move to a focus position desired by the user.
- the zoom lens holding barrel 4 and the correction lens holding barrel 7 are moved in the optical axis direction, and the zoom lenses 4a, 4b and the correction lens 7a are telephotoly moved in the optical axis direction.
- the focal length can be changed, for example, in the range of 75 mm to 225 mm.
- the wide end is when the zoom lens 4a is at position A and the correction lens 7a is at position C
- the tele end is when the zoom lens 4a is at position B and the correction lens 7a is at position D. .
- variable power lenses 4a and 4b are moved in the optical axis direction while keeping a constant interval by the variable power lens holding lens barrel 4, whereas the correction lens 7a is moved independently of the movement. This is because the defocusing caused by the movement of the variable power lenses 4a and 4b is corrected by the correction lens 7a at each position to maintain a focused state.
- the focus lens 2a is moved without rotating the MF operation ring 19 during automatic focus adjustment, and the MF operation ring 19 is moved during manual focus adjustment.
- the focus lens can be moved by rotating, and automatic focus adjustment and manual focus adjustment can be performed without switching by a clutch or the like.
- the locking torque of the MF operating ring 19 is Can be set as desired if it is configured as designed, and no adjustment is required. Therefore, assembly can be performed easily. Further, by setting the shape of the cam groove 15a of the focus cam barrel 15 to the shape described with reference to FIG. 2, the automatic focus adjustment can be performed in a short time even if the adjustment driving range of the focus lens is wide.
- the configuration of the present invention is not limited to the zoom lens barrel according to the embodiment, but may be applied to other lens barrels.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-369769 | 2003-10-30 | ||
JP2003369769A JP2005134588A (ja) | 2003-10-30 | 2003-10-30 | レンズ鏡筒 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005043211A1 true WO2005043211A1 (ja) | 2005-05-12 |
Family
ID=34543832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015813 WO2005043211A1 (ja) | 2003-10-30 | 2004-10-26 | レンズ鏡筒 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2005134588A (ja) |
CN (1) | CN1860396A (ja) |
WO (1) | WO2005043211A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11740431B2 (en) | 2019-10-07 | 2023-08-29 | Hand Held Products, Inc. | Housing of an image capturing device |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101350550B (zh) * | 2007-07-18 | 2011-08-31 | 富准精密工业(深圳)有限公司 | 相机马达及其驱动方法 |
JP5372385B2 (ja) * | 2008-01-25 | 2013-12-18 | セイコーエプソン株式会社 | レンズ装置及びプロジェクタ |
CN101710206B (zh) * | 2009-12-09 | 2011-06-08 | 温州医学院 | 高精度自动对焦装置 |
CN104111513A (zh) * | 2014-06-24 | 2014-10-22 | 苏州世优佳电子科技有限公司 | 一种对焦马达双驱动执行机构 |
CN109154710B (zh) * | 2016-05-27 | 2022-03-08 | 深圳市大疆创新科技有限公司 | 用于平衡变焦镜头的重心的系统 |
JP6727961B2 (ja) * | 2016-07-06 | 2020-07-22 | キヤノン株式会社 | 光学機器 |
CN107703599A (zh) * | 2017-11-24 | 2018-02-16 | 浙江大立科技股份有限公司 | 红外成像设备 |
CN109041590B (zh) * | 2017-12-11 | 2021-02-19 | 深圳市大疆创新科技有限公司 | 手动对焦的提示方法、控制装置、拍摄设备及控制器 |
CN114174884B (zh) * | 2019-07-24 | 2023-08-01 | 富士胶片株式会社 | 镜筒 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120649A (ja) * | 1993-10-21 | 1995-05-12 | Olympus Optical Co Ltd | レンズ鏡筒 |
JPH09281380A (ja) * | 1996-04-11 | 1997-10-31 | Canon Inc | 停止位置制御装置および光学機器 |
JPH1114885A (ja) * | 1997-06-26 | 1999-01-22 | Sigma Corp | レンズ鏡筒 |
-
2003
- 2003-10-30 JP JP2003369769A patent/JP2005134588A/ja active Pending
-
2004
- 2004-10-26 CN CNA2004800285439A patent/CN1860396A/zh active Pending
- 2004-10-26 WO PCT/JP2004/015813 patent/WO2005043211A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120649A (ja) * | 1993-10-21 | 1995-05-12 | Olympus Optical Co Ltd | レンズ鏡筒 |
JPH09281380A (ja) * | 1996-04-11 | 1997-10-31 | Canon Inc | 停止位置制御装置および光学機器 |
JPH1114885A (ja) * | 1997-06-26 | 1999-01-22 | Sigma Corp | レンズ鏡筒 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11740431B2 (en) | 2019-10-07 | 2023-08-29 | Hand Held Products, Inc. | Housing of an image capturing device |
Also Published As
Publication number | Publication date |
---|---|
CN1860396A (zh) | 2006-11-08 |
JP2005134588A (ja) | 2005-05-26 |
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