JP2016008995A - Lens barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel that is excellent in assemblability without increasing the number of components, and can suppress a damage of a pin part of a potentiometer due to external force to be applied when assembled.SOLUTION: A lens barrel comprises a movable part (151), and the movable part includes: a first barrel (23) that fixes position detection means (15) performing a position detection by movement of the movable part in a prescribed direction; a second barrel (14 and 16) that engages with the movable part, and has a groove part (161) for moving the movable part in the prescribed direction; and an assembly mechanism for assembling the second barrel into the first barrel. The assembly mechanism has: a first concavity part (231a1) provided in one of the first barrel and the second barrel and for guiding the movable part to an introduction part (161a) of the groove part; and a convexity part (141) that is provided in other of the first barrel and the second barrel, and engages with the first concavity part.

Description

  The present invention relates to a lens barrel, and more particularly to assembly of a lens barrel.

  2. Description of the Related Art Conventionally, a method using a potentiometer as a mechanism for detecting the amount of rotation of a rotating member in a lens barrel that enables a zoom operation by operating the rotating member or the like is known. At this time, the structure in which the pin portion of the potentiometer held by the fixing member is engaged with the cam groove portion of the cam member rotating in conjunction with the operation of the rotating member has been common.

  However, when the pin portion of the straight type potentiometer is driven by being engaged with the cam groove portion of the rotating cam member, the pin portion is engaged with the inclined surface, and the pin portion is divided in a direction perpendicular to the straight direction. There was a problem that force was applied and the potentiometer was damaged in the worst case.

  Therefore, Patent Document 1 discloses a structure in which an intermediate member is provided between the pin portion of the potentiometer and the cam groove portion of the cam member in order to prevent the pin portion of the potentiometer from being deformed or damaged by an external force. In addition, a structure is disclosed in which a wide assembly region is provided at a position different from the use region of the cam groove portion in order to improve assembly.

JP 7-43596 A

  However, in the structure of Patent Document 1, it is necessary to separately provide an intermediate member in addition to the potentiometer and the cam member, which increases the number of parts. In addition, simply providing a wide assembly area does not fundamentally improve the assemblability, but as a countermeasure against deformation and damage of the pin part at the time of assembly where the pin part is most likely to be deformed or damaged by external force. The effect of is thin.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel that has good assembling performance and can prevent damage to a pin portion of a potentiometer by an external force applied during assembly without increasing the number of parts.

  A lens barrel according to an aspect of the present invention includes a first lens barrel that includes a movable portion, and that fixes a position detection unit that performs position detection by moving the movable portion in a predetermined direction, and the movable portion. A second lens barrel having a groove for moving the movable part in the predetermined direction, and an assembly mechanism for incorporating the second lens barrel into the first lens barrel, The built-in mechanism includes a first recess provided in one of the first lens barrel and the second lens barrel for guiding the movable portion to the introduction portion of the groove portion, and the first lens barrel. And a convex portion that is provided on the other side of the second lens barrel and engages with the first concave portion.

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

  According to the present invention, it is possible to provide a lens barrel that has good assemblability without increasing the number of parts and can suppress breakage of the pin portion of the potentiometer by an external force applied during assembly.

It is a principal part disassembled perspective view of the lens barrel by Example 1 of this invention. It is sectional drawing of the optical instrument by the Example of this invention. It is a system block diagram of the optical apparatus by the Example of this invention. It is a principal part disassembled perspective view of the lens barrel by Example 1 of this invention. It is detail drawing of the built-in guide groove by Example 1 of this invention. It is an external view of the cam ring by Example 1 of this invention. It is a principal part disassembled perspective view of the lens barrel by Example 1 of this invention. It is a principal part disassembled perspective view of the lens barrel by Example 2 of this invention. It is a principal part disassembled perspective view of the lens barrel by Example 2 of this invention. It is detail drawing of the built-in guide groove by Example 2 of this invention. It is an external view of the cam ring by Example 2 of this invention. It is a perspective view of the guide cylinder by Example 2 of this invention.

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

  Hereinafter, an optical apparatus 100 (camera system, imaging device) according to the first embodiment of the present invention will be described with reference to FIGS. In the following, as the optical apparatus 100, an interchangeable lens type imaging apparatus composed of an interchangeable lens single-lens reflex camera (camera body) 500 and an interchangeable lens (lens apparatus) 200 will be exemplarily shown. It is not limited to. For example, it is also possible to apply a lens-integrated imaging device in which a camera body and a lens device are integrally formed.

  FIG. 2 is a cross-sectional view of the optical device 100 in which the interchangeable lens 200 (lens device, optical device) is connected to the camera body 500 (imaging device body). Here, 1 denotes a first group lens, 2 denotes a first group barrel that holds the first group lens 1, and 17 denotes a first group barrel that fixes the first group barrel. Reference numeral 3 denotes a second group lens, and reference numeral 4 denotes a second group unit that holds the second group lens 3. Reference numeral 5 denotes a third group lens, and reference numeral 6 denotes a third group lens barrel that holds the third group lens 5. Reference numeral 7 denotes an anti-vibration lens that corrects so-called camera shake by moving on a plane perpendicular to the optical axis, and reference numeral 701 denotes an anti-vibration lens holding frame that holds the anti-vibration lens 7. Reference numeral 94 denotes a rolling ball for moving the image blur correction member 700 composed of the image stabilization lens 7 and the image stabilization lens holding frame 701 in a plane orthogonal to the optical axis. The image blur correction member 700 is held by the image stabilizer 8. The vibration isolator 8 is fixed to the third group barrel 6. Reference numeral 9 denotes a focus lens, and reference numeral 10 denotes a focus lens barrel that holds the focus lens 9, which is moved in the optical axis direction by a guide mechanism and a drive mechanism provided in the fourth group lens barrel 11, and performs a focusing operation. Reference numeral 12 denotes a fifth group lens, and reference numeral 13 denotes a fifth group barrel that holds the fifth group lens 12. Reference numeral 34 denotes an aperture unit that adjusts the amount of light, and is fixed to the third group barrel 6. Reference numeral 14 denotes a guide cylinder which is a holding member, and 16 denotes a cam ring which is rotatably fitted to the outer periphery of the guide cylinder 14. The guide tube 14 has a linear groove extending in the optical axis direction for guiding a lens movable in the optical axis direction. The cam ring (cam cylinder) 16 has a cam groove for driving the lens in the optical axis direction. A lens (lens holding frame) movable in the optical axis direction engages with the linear groove and the cam groove, and can move in the optical axis direction when the cam ring 16 rotates around the optical axis. Reference numeral 23 denotes a fixed barrel, which fixes the guide tube 14. Here, the fixed barrel 23 (first barrel) holds and fixes a potentiometer 15 (position detecting means) therein, as will be described later. The potentiometer 15 includes a pin portion 151 (movable portion), and is configured to detect a position when the pin portion 151 moves in a predetermined direction (optical axis direction, straight direction). The cam ring 16 has a sensor cam groove 161 (groove portion) that engages with the pin portion 151 as will be described later. The sensor cam groove 161 has a sensor cam groove notch 161a (notch region) provided at an end (one end) of the cam ring 16, and the pin 151 is introduced from the sensor cam groove notch 161a. The guide tube 14 holds the cam ring 16 on the outer periphery thereof, and the guide tube 14 (second barrel) holding the cam ring 16 is incorporated in the fixed barrel 23 (first barrel). One of the guide tube 14 and the fixed barrel 23 has a convex positioning portion, and the other has a concave positioning portion. After the guide tube 14 and the fixed barrel 23 are positioned by the positioning portion, the guide tube 14 can be fixed to the fixed barrel 23. 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. Reference numeral 19 denotes a manual focus ring unit, which is supported so as to be rotatable about the fixed barrel 23 as an axis. When the manual focus ring unit 19 is rotated, a sensor (not shown) detects the rotation, and performs focus control of the focus lens 9 according to the rotation amount. A manual zoom ring 35 is supported so as to be rotatable about the fixed barrel 23 as an axis. When the manual zoom ring 35 is rotated, a sensor (not shown) detects the rotation and moves the zoom lens in the optical axis direction according to the rotation amount. Reference numeral 33 denotes a contact block which is connected to the printed circuit board 31 by a wiring (not shown) (such as a flexible printed circuit board) and fixed to the mount 32 with screws. Reference numeral 500 denotes a camera body, and 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.

  FIG. 3 shows an electrical configuration of the camera system of the interchangeable lens 200 and the camera body 500 which is the optical apparatus of the present embodiment.

  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 lens barrel 200 via the contacts 502 and 202 when the lens barrel 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 lens barrel 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 speed), and the like based on the photometric result of the photometric unit 505. Further, the camera CPU 501 drives the driving amounts (driving) of the focus lens 9 and the focus lens barrel 10 for obtaining a focused state with respect to the subject based on the focus information that is a detection result of the focus state of the photographing optical system by the focus detection unit 506. Including direction). Here, the focus information is information including a defocus amount and a defocus direction. The 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.

  Furthermore, the camera CPU 501 starts control of the image stabilization operation of the image stabilization device 8 when the predetermined shooting mode is set. 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 cause the aperture unit 34 to set 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 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). Then, the lens CPU 201 controls the image stabilizer driving unit 206 based on the combined displacement amount of the angle shake amount and the parallel shake amount described above to shift the image shake correction member 700 of the image stabilizer 8 to perform the angle shake correction and Perform 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.

  Here, the position detection signals such as the zoom, focus, and anti-vibration operations from the sensor and the detection unit to the lens CPU 201 and the energization of the control signals from the lens CPU 201 to the actuators are flexible printed wiring boards. Do it on the substrate.

  Next, a built-in structure using a guide mechanism will be described with reference to FIGS. 1 and 4 to 7. 1 and 4 are exploded perspective views of main parts of a lens barrel according to Embodiment 1 of the present invention.

  The cam ring 16 is rotatably held with respect to the guide tube 14 and is assembled to the fixed barrel 23 together with the guide tube 14. At this time, the pin portion 151 of the potentiometer 15 held by the fixed barrel 23 is inserted into the sensor cam groove 161 provided in the cam ring 16 from the sensor cam groove notch portion 161a. The pin portion 151 is engaged so that the potentiometer 15 detects the amount of rotation of the cam ring 16 relative to the fixed barrel 23 in the sensor cam groove use region 161b.

  In the conventional configuration, since there is no portion between the fixed barrel 23 and the guide tube 14 that comes into contact with the pin portion 151 and the sensor cam groove 161, the pin portion 151 is used during this assembling operation. Only the assembly force was added. As a result, the pin portion 151 may be deformed or damaged. Further, after this assembling work, it is necessary to perform an operation of inserting the positioning pin 142 of the guide tube 14 into the positioning hole 232 of the fixed barrel 23. The assembling operation is somewhat complicated, and the pin portion 151 is always during the operation. The power of assembly will be concentrated on. Therefore, the risk of deformation and breakage of the pin portion 151 was high.

  In the present invention, an assembling mechanism (guide mechanism) is provided between the guide cylinder 14 (second lens barrel) holding the cam ring 16 and the fixed lens barrel 23 (first lens barrel). Is also received at the position of the guide mechanism, and an excessive force is prevented from being applied to the pin portion 151. Thus, in the present invention, the assembly mechanism is used when the guide tube 14 (second lens barrel) holding the cam tube 16 is assembled into the fixed lens barrel 23 (first lens barrel).

  The built-in mechanism includes a built-in guide groove 231 provided in the fixed barrel 23 and a built-in guide follower 141 provided in the guide tube 14 that can be fixed to the fixed barrel 23. The built-in guide groove 231 has a first region 231 a for inserting the pin portion 151 of the potentiometer 15 into the sensor cam groove notch 161 a of the cam ring 16. In other words, it has the 1st recessed part 231a1 for guiding the pin part 151 of the potentiometer 15 to the sensor cam groove notch part 161a (introduction part). As shown in FIG. 5, the first recess 231a1 is formed so as to extend in the optical axis direction of the lens barrel. Moreover, it has the 2nd area | region 231b for moving the pin part 151 of the potentiometer 15 to the sensor cam groove use area | region 161b of the cam ring 16. FIG. In other words, it has the 2nd recessed part 231b1 which connects with the 1st recessed part 231a1 and guides the pin part 151 to the use area | region 161b of the sensor cam groove 161 to which the pin part 151 moves when the potentiometer 15 performs position detection. As shown in FIG. 5, the second recess 231b1 is formed to extend around the optical axis of the lens barrel. In addition, a third region 231 c for engaging the positioning pin 142 of the guide tube 14 with the positioning hole 232 of the fixed barrel 23 is provided. In other words, it has a third recess 231c1 that is connected to the second recess 231b1 and engages the positioning pin 142 (positioning portion) of the guide tube 14 with the positioning hole 232 (positioning portion) of the fixed barrel 23. . As shown in FIG. 5, the third recess 231c1 is formed to extend in the optical axis direction of the lens barrel. If such a configuration is used, the assembling work may be performed in accordance with the guide mechanism, which is simplified.

  As described above, by providing an assembling mechanism for the fixed barrel and the cylindrical member, it is possible to improve assembly without increasing the number of parts, and to prevent the potentiometer pin portion from being deformed or damaged by an external force applied during assembling. Can do. As a result, it is possible to provide a lens barrel that has good assemblability without increasing the number of parts and can suppress damage to the pin portion of the potentiometer by an external force applied during assembly.

  A lens barrel according to a second embodiment of the present invention will be described with reference to FIGS. As in the first embodiment, the potentiometer 15 is fixed to the fixed barrel 23, and the pin portion 151 is engaged with the sensor cam groove 161 provided in the cam ring 16. In addition, the positioning of the guide tube 14 with respect to the fixed barrel 23 is performed by the engagement of the positioning convex portion 233 provided in the fixed barrel 23 and the positioning concave portion 143 provided in the guide barrel 14.

  The built-in mechanism includes a built-in guide groove 231 provided in the fixed barrel 23 and a built-in guide follower member 144 fixed to the cam ring 16. The built-in guide follower member 144 is also used as a member for fixing a roller member (not shown) to the cam ring 16 and does not increase the number of parts.

  The built-in guide groove 231 has a first region 231 a for inserting the pin portion 151 of the potentiometer 15 into the sensor cam groove notch 161 a of the cam ring 16. In other words, it has the 1st recessed part 231a1 for guiding the pin part 151 of the potentiometer 15 to the sensor cam groove notch part 161a (introduction part). As shown in FIG. 10, the first recess 231a1 is formed to extend in the optical axis direction of the lens barrel. Moreover, it has the 2nd area | region 231b for moving the pin part 151 of the potentiometer 15 to the sensor cam groove use area | region 161b of the cam ring 16. FIG. In other words, it has the 2nd recessed part 231b1 which connects with the 1st recessed part 231a1 and guides the pin part 151 to the use area | region 161b of the sensor cam groove 161 to which the pin part 151 moves when the potentiometer 15 performs position detection. As shown in FIG. 10, the second recess 231b1 is formed to extend around the optical axis of the lens barrel. Further, a third region 231 c for engaging the positioning convex portion 233 of the fixed barrel 23 with the positioning concave portion 143 of the guide tube 14 is provided. In other words, the third concave portion 231c1 is connected to the second concave portion 231b1 to engage the positioning convex portion 233 (positioning portion) of the fixed barrel 23 with the positioning concave portion 143 (positioning portion) of the guide tube 14. Have. As shown in FIG. 10, the third recess 231c1 is formed to extend in the optical axis direction of the lens barrel.

  Similar to the first embodiment, the sensor cam groove 161 has a sensor cam groove notch portion 161a for inserting the pin portion 151 of the potentiometer 15 and a sensor cam groove use region 161b.

  As described above, by providing an assembling mechanism for the fixed barrel and the cylindrical member, it is possible to improve assembly without increasing the number of parts, and to prevent the potentiometer pin portion from being deformed or damaged by an external force applied during assembling. Can do. As a result, it is possible to provide a lens barrel that has good assemblability without increasing the number of parts and can suppress damage to the pin portion of the potentiometer by an external force applied during assembly.

  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.

  In the first and second embodiments, the configuration in which the built-in guide groove 231 (concave portion) is provided in the fixed barrel 23 and the built-in guide followers 141 and 144 (convex portions) are provided in the guide tube 14 or the cam ring 16 has been described. Is not limited to this. For example, a built-in guide follower (projection) is provided in the fixed barrel 23 (first barrel), and a built-in guide groove (in the second barrel) or cam ring 16 (second barrel) is provided. You may comprise so that a recessed part) may be provided. In other words, the built-in mechanism of the present invention is provided with a recess in one of the first lens barrel and the second lens barrel, and a projection that engages the recess in the other of the first lens barrel and the second lens barrel. A portion may be provided.

  The present invention can be suitably used for an imaging apparatus such as a compact digital camera, a single-lens reflex camera, and a video camera.

14: Guide tube 141: Built-in guide follower 15: Potentiometer 151: Pin portion 16: Cam ring 161: Sensor cam groove 161a: Sensor cam groove notch 23: Fixed lens barrel 231: Built-in guide groove

Claims (14)

A first barrel that includes a movable part, and fixes a position detection unit that detects a position by moving the movable part in a predetermined direction;
A second lens barrel having a groove for engaging the movable part and moving the movable part in the predetermined direction;
An assembly mechanism for incorporating the second lens barrel into the first lens barrel;
The built-in mechanism is
A first recess provided in one of the first lens barrel and the second lens barrel for guiding the movable portion to the introduction portion of the groove;
A protrusion provided on the other of the first lens barrel and the second lens barrel and engaging with the first recess;
A lens barrel comprising:   The lens barrel according to claim 1, wherein the first recess extends in an optical axis direction of the lens barrel. The built-in mechanism is
The second concave portion is connected to the first concave portion, and has a second concave portion that guides the movable portion to a use region of the groove portion where the movable portion moves when the position detection unit performs position detection. The lens barrel according to 1 or 2.   The lens barrel according to claim 3, wherein the second recess extends around an optical axis of the lens barrel. The built-in mechanism is
5. A third recess for connecting to the second recess and engaging the positioning portion of the second lens barrel with the positioning portion of the first lens barrel. The lens barrel according to any one of the above.   The lens barrel according to claim 5, wherein the third recess extends in an optical axis direction of the lens barrel. One of the positioning part of the first lens barrel and the positioning part of the second lens barrel has a convex shape,
The lens barrel according to claim 5, wherein the other of the positioning portion of the first lens barrel and the positioning portion of the second lens barrel has a concave shape.   The lens barrel according to claim 1, wherein the movable portion is movable in an optical axis direction of the lens barrel.   9. The lens barrel according to claim 1, wherein the position detecting means is a potentiometer, and the movable part is a pin part of the potentiometer. The first lens barrel is a fixed lens barrel,
The said 2nd lens-barrel consists of a cam cylinder which has the said groove part, and a guide cylinder which hold | maintains the said cam cylinder and can be fixed to the said fixed lens-barrel. The lens barrel described in 1.   The lens barrel according to claim 10, wherein the built-in mechanism of the second barrel is provided in the cam barrel.   The lens barrel according to claim 10, wherein the built-in mechanism of the second barrel is provided in the guide barrel.   The lens barrel according to any one of claims 10 to 12, wherein the introduction portion is a cutout region provided at an end portion of the cam barrel. The lens barrel according to any one of claims 1 to 13,
An imaging device comprising: an imaging element that receives light from the lens barrel.