JP2011033847A - Lens device and photographing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten time required for the setup for positional control of a lens holding member moved by a cam ring. <P>SOLUTION: A lens device includes: the lens holding member 2 holding a lens; a cam 7b with which a cam follower 26, provided on the lens holding member, engages; a cam ring 7 rotated in a direction around an optical axis, and thereby moving the lens holding member in the direction of the optical axis; and a position detecting means 36 for detecting whether the lens holding member is located at a predetermined position in the direction of the optical axis. In the cam, the inclined angle, with respect to the direction around the optical axis of a first cam part 7e with which the cam follower engages when the lens holding member is located at the predetermined position, is made to be smaller than the inclined angle of a second cam part adjacent to the first cam part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a lens apparatus used in a photographing apparatus such as a compact digital camera. More specifically, the lens apparatus moves a lens holding member in the optical axis direction by rotation of a cam ring and detects the position of the lens holding member. About.

As such a lens apparatus, there is a lens barrel disclosed in Patent Document 1. In this lens barrel, the cam follower provided on the lens holding member is engaged with the cam groove formed on the cam ring, and the lens holding member is moved in the optical axis direction by rotating the cam ring around the optical axis. Let
In addition, the lens holding member is formed with a light shielding portion, and the light shielding portion enters between the light emitting portion and the light receiving portion of the photo interrupter fixed to the lens barrel, so that the lens holding member is placed on the optical axis. It is detected that it is located at a predetermined reference position in the direction. The position of the lens holding member in the optical axis direction can be detected by counting from the reference position the number of pulse signals generated by a pulse generation mechanism provided in the motor unit that rotationally drives the cam ring. And the position of the lens holding member can be accurately controlled.

JP 2004-198499 A

However, generally, the cam follower that engages with the cam groove is formed to have an outer diameter smaller than the width of the cam groove in order to ensure smooth movement within the cam groove. In this case, if the inclination angle of the cam groove with respect to the direction around the optical axis (the rotation direction of the cam ring) is large (that is, the cam lift is large), the amount of cam follower that can be rattled in the cam groove also increases. For this reason, a difference (hysteresis) occurs in the rotation position of the cam ring that positions the lens holding member at the reference position depending on the rotation direction of the cam ring and the attitude of the lens barrel, and an operation and processing for eliminating the hysteresis are required. Become. As a result, the time required for the setup until the accurate position control of the lens holding member becomes possible becomes longer.

  The present invention provides a lens apparatus capable of shortening the time required for setup for position control of a lens holding member moved by a cam ring, and an imaging apparatus equipped with the lens apparatus.

A lens apparatus according to an aspect of the present invention includes a lens holding member that holds a lens, and a cam that engages with a cam follower provided on the lens holding member. A cam ring that moves the member in the optical axis direction and a position detection unit that detects that the lens holding member is located at a predetermined position in the optical axis direction. In the cam, the second cam adjacent to the first cam portion has an inclination angle with respect to the direction around the optical axis of the first cam portion to which the cam follower engages when the lens holding member is located at a predetermined position. It is smaller than the inclination angle of the part.
A lens device according to another aspect of the present invention includes a lens holding member that holds a lens, and a first cam that engages a first cam follower provided on the lens holding member, and an optical axis. A first cam ring that moves the lens holding member in the optical axis direction by rotating in the rotation direction, and a second cam that engages with a second cam follower provided on the first cam ring. A second cam ring for moving the first cam ring rotating in the direction around the optical axis in the optical axis direction, and a position detecting means for detecting that the lens holding member is located at a predetermined position in the optical axis direction. Have In at least one of the first and second cams, the cam follower that engages one of the first and second cam followers engages when the lens holding member is positioned at a predetermined position. The inclination angle of the first cam portion with respect to the direction around the optical axis is smaller than the inclination angle of the second cam portion adjacent to the first cam portion.
Note that a photographing apparatus including the lens device and a photographing device main body for photographing a subject image formed by the lens device also constitutes another aspect of the present invention.

  According to the present invention, by setting the tilt angle of the first cam portion to be smaller than the tilt angle of the second cam portion, the lens holding member, which is generated depending on the rotation direction of the cam ring or the posture of the lens device, is set at a predetermined position. Hysteresis of the rotational position of the cam ring for positioning can be reduced. For this reason, the time required for the setup for the position control of the lens holding member moved by the cam ring can be shortened. In addition, since the inclination angle of the second cam portion can be increased, the amount of movement of the lens holding member by the second cam portion relative to the rotation amount of the cam ring can be increased.

1 is an exploded perspective view of a lens barrel that is an embodiment of the present invention. Sectional drawing of the lens-barrel (accommodated state) of an Example. Sectional drawing of the lens-barrel (WIDE end state) of an Example. Sectional drawing of the lens-barrel (TELE end state) of an Example. FIG. 3 is a development view of a moving cam ring used in the lens barrel of the embodiment. FIG. 3 is a development view of a fixed cam ring used in the lens barrel of the embodiment. FIG. 3 is a perspective view of a movable cam ring and a straight guide cylinder in the lens barrel of the embodiment. The perspective view which shows the 2nd lens barrel and photointerrupter in the lens barrel of an Example. The enlarged view of the cam groove part formed in the said moving cam ring. The development view of the conventional moving cam ring. The enlarged view of the cam groove part formed in the conventional dynamic cam ring. FIG. 6 is a development view of a fixed cam ring used in a lens barrel that is Embodiment 2 of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an exploded view of a lens barrel (lens device) provided in a photographing apparatus that is an embodiment of the present invention. The lens barrel of this embodiment is provided in the camera main body (shooting apparatus main body) 100 shown in FIGS. 2 and 3, and protrudes from the camera main body 100 and is stored in the camera main body 100. Projecting / storing operation is performed between (collapsed state). Further, the lens barrel performs a zoom operation in the protruding state. The camera main body 100 is equipped with an electronic circuit for photoelectrically converting a subject image formed by the lens barrel by an image sensor described later to generate image data of the subject.
2, 3 and 4 show cross-sectional configurations of the lens barrel in the retracted state, wide angle (WIDE) end state, and telephoto (TELE) end state, respectively. Further, FIGS. 5 to 9 partially show the configuration of the lens barrel of the present embodiment.
In these drawings, L1 is a first lens unit, L2 is a second lens unit, L3 is a third lens unit that moves in a plane orthogonal to the optical axis and performs an image blur correction (anti-shake) operation, and L4 is a light beam. This is a fourth lens unit that moves in the axial direction and performs a focus adjustment operation.
Reference numeral 1 denotes a first lens barrel as a first lens holding member that holds the first lens unit L1, and reference numeral 2 denotes a second lens barrel as a second lens holding member that holds the second lens unit L2. Reference numeral 3 denotes a shift unit as a third lens holding member that holds the third lens unit L3 so as to be movable (shiftable) in a plane orthogonal to the optical axis. Reference numeral 4 denotes a fourth lens holding frame that holds the fourth lens unit L4, and reference numeral 5 denotes an aperture / shutter unit that adjusts the amount of light.
Reference numeral 6 denotes a shift unit cam pin as a conical third cam follower fixed to the rear end portion of the shift unit 3 by press-fitting or bonding. Three shift unit cam pins 6 are provided in the circumferential direction of the shift unit 3.
Reference numerals 8 and 9 are guide bars for guiding the movement of the fourth lens holding frame 4 in the optical axis direction. Reference numeral 11 denotes an image sensor holder that positions and fixes the rear ends of the guide bars 8 and 9, and further holds an image sensor (not shown) such as a CCD sensor or a CMOS sensor. Reference numeral 12 denotes a rear barrel that positions and fixes the front ends of the guide bars 8 and 9, and is coupled to the image sensor holder 11 by screws.
Reference numeral 16 denotes a focus motor serving as a drive source for moving the fourth lens holding frame 4 in the optical axis direction. The output shaft of the focus motor 16 is formed as a lead screw 16a, and a rack 17 attached to the fourth lens holding frame 4 is screwed into the lead screw 16a. When the lead screw 16 a is rotated by the focus motor 16, the fourth lens holding frame 4 is driven in the optical axis direction via the rack 17. The focus motor 16 is fixed to the rear barrel 12 with screws.
Reference numeral 18 denotes a rack spring for removing looseness between the fourth lens holding frame 4 and the rack 17. Reference numeral 35 denotes a photo interrupter that detects that the fourth lens holding frame 4 is positioned at the reference position. A light shielding portion formed on the fourth lens holding frame 4 enters between the light emitting portion and the light receiving portion of the photo interrupter 35. Thus, it is detected that the fourth lens holding frame 4 is located at the reference position.
Reference numeral 13 denotes a fixed cam ring as a second cam ring. As shown in FIG. 9, three cam groove portions 13 a for moving the movable cam ring 7 in the optical axis direction are formed on the inner peripheral surface of the fixed cam ring 13. Further, on the inner peripheral surface of the fixed cam ring 13, three keys that engage with a key 10 h provided on a guide cylinder 10 serving as a linear guide ring and perform eccentric positioning and linear guide with respect to the optical axis of the guide cylinder 10 are provided. A guide groove 13b is also formed. The fixed cam ring 13 is fixed to the image sensor holder 11 with screws.
Reference numeral 7 denotes a moving cam ring as a first cam ring. On the inner peripheral surface of the movable cam ring 7, as shown in FIG. 7, a first cam groove 7a for moving the first lens barrel 1, the second lens barrel 2 and the shift unit 3 in the optical axis direction, respectively. Three second cam groove portions (first cams) 7b and three third cam groove portions 7c are formed. The first to third cam groove portions 7a to 7c have different cam shapes (cam loci). The movable cam ring 7 is coupled to the guide tube 10 so as to be rotatable around the optical axis in a state where movement in the optical axis direction is prevented by a bayonet structure (not shown). Therefore, the movable cam ring 7 moves in the optical axis direction with respect to the fixed cam ring 13 integrally with the guide tube 10 while rotating around the optical axis.
Reference numeral 14 denotes a cylindrical gear, which is formed long in the optical axis direction so as to be always screwed with a gear portion formed in the movable cam ring 7 movable in the optical axis direction. The cylindrical gear 14 rotates at a fixed position around a gear shaft 15 sandwiched between the fixed cam ring 13 and the image sensor holder 11.
A zoom motor unit 28 is fixed to the image sensor holder 11 with screws. An output gear (not shown) provided in the zoom motor unit 28 is screwed into the cylindrical gear 14. Thereby, the rotational force from the zoom motor unit 28 can be transmitted to the movable cam ring 7 via the cylindrical gear 14, and this can be rotated.
Reference numeral 36 denotes a photo interrupter (position detecting means) for detecting that the second lens barrel 2 is located at a reference position as a predetermined position. As shown in FIG. 8, when the light shielding part 2a formed in the second lens barrel 2 enters between the light emitting part and the light receiving part of the photo interrupter 36, it is detected that the second lens barrel 2 is located at the reference position. can do.
Three cam pins (second cam followers) 27 provided in the circumferential direction on the movable cam ring 7 are engaged with cam groove portions 13 a as three second cams provided on the fixed cam ring 13. First cam pins 25 serving as first cam followers provided on the first barrel 1 in the circumferential direction are engaged with the first cam grooves 7 a provided on the movable cam ring 7. Further, three second cam pins (first cam followers) 26 provided in the circumferential direction in the second barrel 2 are engaged with the three second cam grooves 7b. Further, three shift unit cam pins 6 provided in the circumferential direction of the shift unit 3 are engaged with the three third cam grooves 7c. By moving the movable cam ring 7 in the optical axis direction while rotating around the optical axis, the first lens barrel 1, the second lens barrel 2, and the shift unit 3 move in the optical axis direction. As a result, the lens barrel projects and retracts with respect to the camera body and performs a zoom operation.
Next, the shape (trajectory) of the first, second and third cam groove portions 7a, 7b and 7c formed on the inner peripheral surface of the movable cam ring 7 and the fixed cam ring 13 will be described with reference to FIGS. The shape of the cam groove part 13a formed in the inner peripheral surface will be described. 5 and 6 show the movable cam ring 7 and the fixed cam ring 13 developed in the circumferential direction (direction around the optical axis).
In FIG. 5, the left direction is the rotation direction of the movable cam ring 7 (hereinafter referred to as the storage rotation direction) during the zoom operation from the TELE side to the WIDE side and during the storage operation. The right direction is the rotation direction of the movable cam ring 7 (hereinafter referred to as the protrusion rotation direction) during the protrusion operation and the zoom operation from the WIDE side to the TELE side.
First, the shape of the cam groove 13a formed on the inner peripheral surface of the fixed cam ring 13 will be described with reference to FIG. As described above, the cam pins 27 provided at three positions in the movable cam ring 7 at intervals of 120 ° in the circumferential direction are engaged with the cam groove portions 13 a of the fixed cam ring 13. The moving cam ring 7 is rotated in the projecting rotation direction from the housed state, so that the movable cam ring 7 is extended from the housed position to the TELE end position via the WIDE end position. The cam groove 13a has a flat cam shape (parallel to the direction around the optical axis) in the vicinity of the storage position, the WIDE end position, and the TELE end position. 13c is an introduction groove part for introducing the cam pin 27 into the cam groove part 13a, and is connected to the storage side end part of the cam groove part 13a.
In FIG. 5, the first cam pins 25 provided at three locations in the first lens barrel 1 at intervals of 120 ° in the circumferential direction engage with the first cam groove portions 7 a of the movable cam ring 7. The first lens barrel 1 is monotonously extended from the storage position toward the WIDE end position toward the subject side as the movable cam ring 7 rotates in the protruding rotation direction from the storage state. Then, the image is once retracted from the WIDE end position toward the TELE end position toward the image plane side, and then is extended toward the subject side from the WIDE end position to reach the TELE end position. At this time, since the moving cam ring 7 itself is also extended to the fixed cam ring 13, the first lens barrel 1 is moved by the cam groove portion 13a and the first lens barrel 1 by the first cam groove portion 7a. It moves to a position corresponding to the combined movement amount with the movement amount.
The storage-side end of the first cam groove 7a and the storage-side end of the second cam groove 7b are connected by a connection groove 7f. The connection groove 7f is a groove formed to introduce the first cam pin 25 introduced from the introduction groove described later into the second cam groove 7b into the first cam groove 7a from the second cam groove 7b. is there.
The second cam pins 26 provided at three positions in the second lens barrel 2 at intervals of 120 ° in the circumferential direction engage with the second cam groove portions 7 a of the movable cam ring 7. When the movable cam ring 7 rotates in the projecting rotation direction from the housed state, the second lens barrel 2 is monotonously extended from the housed position toward the WIDE end position, and is monotonously extended from the WIDE end position toward the TELE end position. Include. At this time, since the moving cam ring 7 itself is also extended to the fixed cam ring 13, the second lens barrel 2 is moved by the cam groove portion 13a and the second lens barrel 2 by the second cam groove portion 7b. It moves to a position corresponding to the combined movement amount with the movement amount.
The first and second cam groove portions 7a and 7b have a flat cam shape in the vicinity of the storage position, the WIDE end position, and the TELE end position.
In the following description, among the cam groove portion 13a and the first to third cam groove portions 7a to 7c, the movable cam ring 7, the first lens barrel 1, the second lens barrel 2 and the shift unit 3 are set to the storage position and WIDE. A portion that is moved between the end positions is referred to as a storage cam region. A portion that is moved between the WIDE end position and the TELE end position is referred to as a zoom cam region.
First and second cam pins 25 and 26 (first shafts) are inserted into the TELE side end portion of the second cam groove portion 7b from an insertion port opened at the end surface in the optical axis direction of the moving cam ring 7 (lower end surface in FIG. 5). An introduction groove 7d for introducing the second lens barrel 1 and 2) into the second cam groove 7b in this order is connected.
Shift unit cam pins 6 provided at three positions at 120 ° intervals in the circumferential direction of the shift unit 3 engage with the third cam groove portion 7 c of the moving cam ring 7. The shift unit 3 is retracted from the storage position to the WIDE end position when the movable cam ring 7 rotates in the protruding rotation direction from the storage state. Then, after further retracting from the WIDE end position toward the TELE end position, the WIDE end position is extended beyond the WIDE end position to reach the TELE end position. At this time, the moving cam ring 7 itself is also fed out with respect to the fixed cam ring 13, so that the shift unit 3 has a moving amount of the moving cam ring 7 by the cam groove portion 13a and a moving amount of the shift unit 3 by the third cam groove portion 7c. It moves to the position according to the amount of the combined movement.
The TELE side end portion of the third cam groove portion 7c is connected to an intermediate position of the introduction groove portion 7d that connects the aforementioned insertion port and the second cam groove portion 7b. That is, the third cam groove portion 7c is formed so as to branch from the middle of the introduction groove portion 7d. Then, after the shift unit cam pin 6 is introduced from the insertion port to a midway position of the introduction groove 7d, it is introduced into the third cam groove 7c.
In the zoom operation and the projecting / storing operation, the movable cam ring 7 having the cam groove portions 7a to 7c having the shape as described above moves in the optical axis direction by the cam groove portion 13a of the fixed cam ring 13 while rotating around the optical axis. . As a result, the first lens barrel 1, the second lens barrel 2, and the shift unit 3 move in the optical axis direction while being guided by the guide groove portions 10a and 10b formed in the guide tube 10 as shown in FIG.
As shown in a circled region Y in FIG. 5, the intermediate cam portion (first cam portion) 7 e in the storage cam region of the second cam groove portion (one cam) 7 b rotates the moving cam ring 7. It is formed to extend in parallel to the direction around the optical axis, which is the direction (circumferential direction). On the other hand, the cam portion (second cam portion) adjacent to the intermediate cam portion 7e in the same storage cam region on the storage position side and the WIDE end position side is the intermediate cam portion in the direction around the optical axis. The tilt angle is larger than 7e. In other words, the inclination angle of the intermediate cam portion 7e with respect to the direction around the optical axis is greater than the inclination angle of the cam portion adjacent to the intermediate cam portion 7e (hereinafter referred to as the storage side cam portion and the WIDE side cam portion) with respect to the direction around the optical axis. Is also small.
The intermediate cam portion 7e engages with the second cam pin 26 when the second lens barrel 2 (the light shielding portion 2a) is located at the reference position detected by the photo interrupter 36.
However, the intermediate cam portion may be formed so as not to be parallel to the direction around the optical axis but to have a smaller angle of inclination than the storage-side cam region and the WIDE-side cam region.
In this embodiment, as shown in FIG. 8, the photo interrupter 36 is fixed near the image sensor holder 11 disposed at the rear end of the lens barrel, and the optical axis direction of the photo interrupter 36 and the shift unit 3 or the like is fixed. Interference during the storing operation with the member that moves to the position is avoided. For this reason, it is necessary to detect the reference position of the second barrel 2 by the photo interrupter 36 not in the zoom cam area of the second cam groove 7b but in the storage cam area. The protrusion / storage operation is preferably performed basically at high speed. For this reason, the inclination angle of the storage cam area with respect to the direction around the optical axis is preferably as large as possible.
However, if the inclination angle of the entire storage cam area is uniformly increased, a large hysteresis is generated in the rotational position of the movable cam ring that positions the second barrel at the reference position depending on the rotational direction of the movable cam ring and the attitude of the lens barrel. .

FIG. 10 shows a conventional moving cam ring 7 ′ developed in the circumferential direction. Reference numeral 7b 'denotes a second cam groove. Further, FIG. 11 shows an enlarged circled region Z in FIG.
In FIG. 11, the amount of play between the second cam pin 26 and the second cam groove 7b provided in the second lens barrel 2 (the outer diameter of the second cam pin 26 and the width of the second cam groove 7b ') ) Is B. The amount of play between the second cam pin 26 and the guide groove 10b formed in the guide cylinder 10 (the difference between the outer diameter of the second cam pin 26 and the width of the guide groove 10b) is C. At this time, the maximum hysteresis is A.
The amount of movement of the second lens barrel 2 in the optical axis direction is a combination of the amount of movement by the second cam groove portion 7b 'and the amount of movement by the cam groove portion 13a formed in the fixed cam ring 13 as described above. The amount of movement. For this reason, the amount of play between the cam pin 27 provided on the moving cam ring 7 ′ and the cam groove 13 a is also added, and the maximum amount of hysteresis is almost twice that of A.

When hysteresis increases in this way, it is necessary to identify and remove the movement amount corresponding to the hysteresis in zoom operation control, and to set up until high-precision zoom operation control is possible. It takes longer time.
Therefore, in this embodiment, the intermediate cam that engages with the second cam pin 26 when the second barrel 2 is located at the reference position detected by the photo interrupter 36 in the storage cam region of the second cam groove 7b. The portion 7e is formed to extend in parallel to the direction around the optical axis. Further, the inclination angle of the storage side cam portion and the WIDE side cam portion in the storage cam region with respect to the direction around the optical axis is made larger than the inclination angle of the intermediate cam portion 7e.
The second lens barrel 2 is not moved in the optical axis direction by the intermediate cam portion 7e parallel to the direction around the optical axis at the reference position and in the vicinity thereof, but in the optical axis direction by the cam groove portion 13a of the fixed cam ring 13. Moved. For this reason, the reference position can be detected.
FIG. 9 shows an enlarged circled region Y in FIG. Even if the amount of backlash between the second cam pin 26 and the second cam groove 7b and the backlash between the second cam pin 26 and the guide groove 10b are B and C shown in FIG. Becomes D smaller than A. That is, according to the present embodiment, the hysteresis can be reduced as compared with the conventional case shown in FIG.
Therefore, it is possible to shorten the time required for the setup for zoom operation control (position control of the first lens barrel 1, the second lens barrel 2, and the shift unit 3).
The microcomputer 50 shown in FIG. 1 operates the zoom motor unit 28 so that the lens barrel in the housed state protrudes when the camera is turned on. Further, the microcomputer 50 operates the zoom motor unit 28 so that the protruding lens barrel is retracted when the power of the camera is cut off. In these protruding and retracting operations, the microcomputer 50 resets the pulse counter in the microcomputer 50 when a detection signal indicating that the second lens barrel 2 is located at the reference position is input from the photo interrupter 36. . This operation is called a reset operation.
The microcomputer 50 counts the number of pulse signals generated by a pulse generation mechanism (not shown) provided in the zoom motor unit 28 from the time when the pulse counter is reset. Accordingly, the lens barrel can be accurately stopped at the storage position or the wide end position, and the zoom operation (zoom position) can be controlled with high accuracy.
As the pulse generation mechanism, for example, a mechanism in which a pulse plate and a photo interrupter or a photo reflector are combined can be used. Further, instead of using the pulse generation mechanism, a stepping motor may be used for the zoom motor unit 28, and the number of pulse signals given to the stepping motor may be counted.
Further, when the detection signal indicating that the fourth lens holding frame 4 is located at the reference position is input from the photo interrupter 35, the microcomputer 50 resets the pulse counter in the microcomputer 50. Thereafter, the number of pulse signals applied to the focus motor (stepping motor) 16 is counted to control the position (that is, focusing) of the fourth lens holding frame 4.

In the first embodiment, a case where the intermediate cam portion (first cam portion) 7e is provided in the second cam groove 7b has been described. However, as shown in FIG. 12, the first cam portion 13e ′ is provided in the storage cam region of the cam groove portion 13a ′ of the fixed cam ring 13 ′, and the second cam groove portion 7b of the moving cam ring 7 is shown in FIG. You may form similarly to the conventional example.

An intermediate cam portion (first cam portion) 7e parallel to the direction around the optical axis is provided in the second cam groove portion 7b, and the cam groove portion 13a of the fixed cam ring 13 has a small angle with respect to the direction around the optical axis. You may provide the 1st cam part which inclines. Thereby, the second lens barrel 2 can be moved in the optical axis direction at and near the reference position, and the hysteresis can be further reduced.
Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.
For example, the shape of the first to third cam groove portions of the moving cam ring and the shape of the cam groove portion of the fixed cam ring in the above embodiment are merely examples, and may be formed to have other shapes. Moreover, the flat part formed in the storage position in each cam groove part, a WIDE end position, and a TELE end position is not necessarily provided.
Furthermore, the overall configuration of the lens barrel is merely an example, and the present invention can be applied to a lens barrel having another configuration including at least a rotating cam ring. In each of the above embodiments, the cam groove portion is formed in the cam ring, but a convex cam may be formed instead of the cam groove portion.

It is possible to provide a lens device that takes a short time for setting up the position of the lens holding member that is moved by the cam ring, and a photographing device including the lens device.

DESCRIPTION OF SYMBOLS 1 1st lens barrel 2 2nd lens barrel 3 Shift unit 6, 25, 26 Cam pin 7 Moving cam ring 7a, 7b, 7c, 13a Cam groove part 7e Intermediate cam part 10 Guide cylinder 13 Fixed cam ring 100 Camera body

Claims (6)

A lens holding member for holding the lens;
A cam ring having a cam engaged with a cam follower provided on the lens holding member, and rotating the lens holding member in the optical axis direction by rotating around the optical axis;
Position detecting means for detecting that the lens holding member is located at a predetermined position in the optical axis direction;
In the cam, an inclination angle of the first cam portion with which the cam follower engages when the lens holding member is located at the predetermined position with respect to the direction around the optical axis is a second adjacent to the first cam portion. A lens device characterized in that it is smaller than the tilt angle of the cam portion. The lens apparatus according to claim 1, wherein the first cam portion is formed in parallel to the direction around the optical axis. A lens holding member for holding the lens;
A first cam ring that has a first cam with which a first cam follower provided on the lens holding member engages, and moves the lens holding member in the optical axis direction by rotating around the optical axis. When,
A second cam that is engaged with a second cam follower provided on the first cam ring, and that moves the first cam ring rotating in the direction around the optical axis in the optical axis direction. Two cam rings,
Position detecting means for detecting that the lens holding member is located at a predetermined position in the optical axis direction;
In at least one of the first and second cams, a cam follower that engages with the one of the first and second cam followers when the lens holding member is located at the predetermined position. A lens apparatus, wherein an inclination angle of the first cam portion to be combined with respect to a direction around the optical axis is smaller than the inclination angle of a second cam portion adjacent to the first cam portion. The lens device according to claim 3, wherein the first cam portion is formed in parallel to the direction around the optical axis. The lens device is capable of projecting / storing with respect to the image taking device body, and is capable of zooming in the projecting state.
5. The lens device according to claim 1, wherein the cam follower engages with the first and second cam portions in the projecting / storing operation. 6. A lens device according to any one of claims 1 to 5;
An imaging apparatus comprising: an imaging apparatus body that captures a subject image formed by the lens apparatus.