JP2012203340A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a feeling at the time of switching by slide movement of ring members that rotate relative to a lens barrel body and slidably move in an optical axis direction.SOLUTION: When a first focus ring 20, that is arranged to be capable of endlessly rotating relative to a lens barrel body 10 and is slidably arranged between a first slide position and a second slide position in an optical axis direction, is moved to the first slide position, the first focus ring 20 is adsorbed by magnetic force, in which a magnet 22 on the first focus ring 20 side and a magnet 32 provided on a second focus ring 30 side whose rotation range is controlled are abutted. Similarly, when the first focus ring 20 is moved to the second slide position, the first focus ring 20 is absorbed by magnetic force, in which a magnet 24 on the first focus ring 20 side and a magnet 42 provided on a third focus ring 40 side capable of endlessly rotating are abutted.

Description

  The present invention relates to a lens device, and more particularly to a click mechanism for a ring member of the lens device.

  Conventionally, in a lens device used in a portable ENG (Electronic News Gathering) camera used for TV coverage, etc., manual focus is performed by moving the focus lens by manually rotating the focus ring. At the time of (MF), a first MF mode for outputting an absolute position signal corresponding to the rotation position of the focus ring as a focus lens movement command, and a relative position signal corresponding to the rotation amount of the focus ring as a focus lens movement command And a second MF mode that is output as (Patent Document 1).

  FIG. 11 is an enlarged cross-sectional view of a main part of the lens device described in Patent Document 1.

  In this lens apparatus, a first focus ring 2 and a second focus ring 3 are rotatably arranged on an outer peripheral portion of a front fixed ring 1 that constitutes a part of a lens barrel body. The rotation range is not restricted, it can be rotated endlessly and is slidable in the optical axis direction, and the second focus ring 3 can be rotated within a range of about 120 degrees by a stopper. So that it is regulated. Endless rotation refers to a configuration that has no starting point or end point of rotation and is capable of rotating 360 degrees or more.

  Sawtooth-shaped clutch portions 2A and 3A are formed on the end faces where the first focus ring 2 and the second focus ring 3 face each other. In the state shown in FIG. 12, the clutch portions 2A and 3A are connected (engaged). Then, the first focus ring 2 and the second focus ring 3 rotate integrally. Therefore, when the first focus ring 2 is manually rotated in this state, it can be rotated only within a range of about 120 degrees.

  On the other hand, when the first focus ring 2 is slid forward so as to get over the click elastic member 4, the clutch portions 2A and 3A are disconnected. As a result, the first focus ring 70 can be rotated endlessly.

  As shown in FIG. 13, the click elastic member 4 is disposed at each position obtained by dividing the periphery of the front fixed ring 1 into three equal parts, and a convex portion 4 </ b> A having a semi-cylindrical shape is formed on the upper surface of the central portion. A contact portion 2B having a triangular cross section having two inclined surfaces is formed on the inner peripheral surface of the substantially central portion of the inner peripheral surface of the first focus ring 2. When the first focus ring 2 is slid and the contact portion 2B of the first focus ring 2 moves down to the position shown in FIG. The clutch portion 2A formed at the end of 2 engages with the clutch portion 3A formed at the end of the second focus ring 72 so that the first focus ring 70 and the second focus ring 72 can rotate integrally. It becomes like this.

  On the other hand, the first focus ring 2 is slid leftward in FIG. 11, and the contact portion 2B of the first focus ring 2 moves down to a predetermined position where the convex portion 4A of the click elastic member 4 is pushed down. Then, the clutch portions 2A and 3A are disconnected. As a result, the first focus ring 2 can be rotated endlessly.

  Then, when the first focus ring 2 is slid and the contact portion 2B of the first focus ring 2 moves over the convex portion 4A of the click elastic member 4, a click force is generated, and a click feeling is obtained. .

  Also, an operation mode selection device using a magnet has been proposed in order to give a click feeling to an operator (Patent Document 2).

  In this operation mode selection device, a click feeling movable magnet having N poles and S poles alternately arranged on the same circumference is arranged on the operation dial, and at the same pitch at a position facing the click feeling movable magnet. A click feeling fixed magnet having different magnetic poles alternately arranged on the same circumference is arranged, and a click feeling generated by an attractive force and a repulsive force with the click feeling fixed magnet is imparted to the operation dial. I have to.

JP 2011-43706 A JP 2010-176971 A

  The click mechanism of the lens device described in Patent Document 1 has a problem that the touch when the slide position of the first focus ring 2 is switched (clicking feeling “click”) is weak. Further, when the first focus ring 2 gets over the click elastic member 4, there is a problem that the pulling force to both ends provided by the click elastic member 4 is weak. Although it is conceivable to solve the above problem by increasing the elastic force of the click elastic member 4, in this case, the operating force of the first focus ring 2 to get over the click elastic member 4 is small. There is a problem that it becomes excessive and difficult to operate.

  On the other hand, every time the operation dial is rotated by a predetermined angle, the operation mode selection device described in Patent Document 2 is clicked by the mutual attractive force and repulsive force of the click feeling fixed magnet and the click feeling movable magnet. This feeling of clicking is a change in the load of the operation dial that occurs when the operation dial is rotated, and a “click” feeling does not return to the fingertip after the operation dial is moved.

  The present invention has been made in view of such circumstances, and a lens device capable of improving the touch at the time of switching by sliding movement of a ring member that rotates relative to the lens barrel body and slides in the optical axis direction. The purpose is to provide.

  In order to achieve the above object, a lens apparatus according to one aspect of the present invention is disposed so as to be capable of endless rotation with respect to a lens barrel body, and has a first slide position and a second slide in the optical axis direction. A first ring member that is slidably arranged between the slide position and a second ring member that is arranged to be rotatable only within a predetermined rotation range with respect to the lens barrel body. When the first ring member moves to the first slide position, a second ring member disposed so as to be in contact with one side surface of the first ring member, and the lens barrel A third ring member arranged to be endlessly rotatable with respect to the main body, and when the first ring member moves to the second slide position, the other side surface of the first ring member; A third ring member disposed so as to be capable of contacting; A first magnetic member provided on both end surfaces in the sliding direction of the first ring member, and a surface of the second ring member and a third ring member facing the end surface of the first ring member. A second magnetic member, wherein at least one of the first and second magnetic members is constituted by a magnet, and the first ring member is moved to a first slide position of the first ring member. When it is moved or moved to the second slide position, it is attracted to the second ring member or the third ring member by a magnetic force and rotates in conjunction with the second ring member or the third ring member. It is characterized by having been comprised.

  According to the lens device of one aspect of the present invention, when the first ring member is moved to the first slide position, the first magnetic member provided on one end surface of the first ring member; A second magnetic member provided on a surface of the second ring member facing one end surface of the first ring member is in contact with at least one of the first and second magnetic members. Similarly, when the first ring member is moved to the second slide position, the first magnetic member provided on the other end surface of the first ring member, and the third magnetic member can be adsorbed by magnetic force. A second magnetic member provided on a surface of the ring member facing the other end surface of the first ring member abuts and is attracted by a magnetic force generated by at least one magnet of the first and second magnetic members. be able to. When the first and second ring members are in contact with each other by the magnetic force, or when the first and third ring members are in contact, a good switching feel (feeling of “clicking back”) is obtained. Can do. Further, since the first ring member and the second ring member are attracted by a magnetic force, the second ring member can be rotated within a predetermined rotation range by operating the first ring member. In addition, the first and second magnetic members can function as a clutch unit for transmitting a turning force from the first ring member to the second ring member or for cutting.

  The lens device according to another aspect of the present invention is disposed so as to be capable of endless rotation with respect to the lens barrel body, and slides between a first slide position and a second slide position in the optical axis direction. A first ring member arranged freely, and a second ring member arranged rotatably with respect to the lens barrel body only within a predetermined rotation range, When the ring member moves to the first slide position, endless rotation is performed with respect to the second ring member disposed so as to be in contact with one side surface of the first ring member and the lens barrel body. A third ring member arranged to be able to come into contact with the other side surface of the first ring member when the first ring member moves to the second slide position. A third ring member and an outer peripheral surface of the lens barrel body. A pair of first and second magnets, each of which includes a first magnet and a second magnet provided on an inner peripheral surface of the first ring member, wherein the first ring member is When it is located at an intermediate position between the first slide position and the second slide position, an S pole and an N pole are provided so as to repel each other, and when the first ring member is displaced from the intermediate position, And a first magnet and a second magnet biased by a magnetic force so as to press the first ring member against an end surface of the second ring member or an end surface of the third ring member. .

  According to the lens device according to another aspect of the present invention, a pair of the first magnet provided on the outer peripheral surface of the lens barrel body and the second magnet provided on the inner peripheral surface of the ring member. The first and second magnets are respectively provided with an S pole and an N pole so as to repel each other when the first ring member is positioned between the first slide position and the second slide position. When the first ring member is displaced from the intermediate position, the first ring member is biased by a magnetic force so as to press the end surface of the second ring member or the end surface of the third ring member. Can do. When the first ring member is slid, a large operating force is required as the first ring member approaches the intermediate position. When the first ring member is exceeded, the first ring member becomes the first and second magnets. It is moved to the other slide position by the magnetic force of, and abuts against the second or third ring member and is urged by the magnetic force. A good switching feeling can be obtained when the first ring member abuts, and the operating force of the first ring member changes before and after the slide position of the first ring member is in the middle position, and a click feeling is obtained. Can be obtained.

  The lens device according to still another aspect of the present invention is disposed so as to be capable of endless rotation with respect to the lens barrel body, and between the first slide position and the second slide position in the optical axis direction. A first ring member that is slidably disposed, and a second ring member that is pivotally disposed within a predetermined rotation range with respect to the lens barrel body, wherein When the ring member moves to the first slide position, the second ring member disposed so as to come into contact with one side surface of the first ring member and endless rotation with respect to the lens barrel body The third ring member is disposed so as to be capable of contacting the other side surface of the first ring member when the first ring member moves to the second slide position. Third ring member and the outer periphery of the lens barrel body A pair of first and second magnets, each of which includes a first magnet provided on the inner peripheral surface of the first ring member and a second magnet provided on an inner peripheral surface of the first ring member. When an S pole and an N pole are provided so as to repel each other when positioned at an intermediate position between the first slide position and the second slide position, the first ring member is displaced from the intermediate position. The first and second magnets biased by magnetic force so as to press the first ring member against the end surface of the second ring member or the end surface of the third ring member; and A first magnetic member provided on both end surfaces in the sliding direction, and a second magnetic member provided on a surface of the second ring member and a third ring member facing the end surface of the first ring member. And at least one of the first and second magnetic members The first ring member is formed by a magnetic force when the first ring member is moved to the first slide position or to the second slide position. It is characterized by being adsorbed to the third ring member.

  According to the lens device in accordance with still another aspect of the present invention, the first and second magnetic members can generate the first by both the magnetic force of at least one of the magnets and the magnetic force of the first and second magnets. A good switching feeling can be obtained at the time of contact between the second ring members or at the time of contact between the first and third ring members.

  In the lens device according to still another aspect of the present invention, at least one of the first magnetic member and the second magnetic member is formed in a ring shape. Accordingly, an attractive force can be obtained between the first and second magnetic members regardless of the rotational position of the first ring member.

  In the lens device according to still another aspect of the present invention, at least one of the first magnet and the second magnet is formed in a ring shape. Accordingly, a magnetic force is obtained between the first and second magnets regardless of the rotational position of the first ring member.

  In the lens device according to still another aspect of the present invention, an absolute position signal corresponding to the rotational position of the second ring member is transmitted to the focus lens when the first ring member is moved to the first slide position. A first manual focus mode that is output as a movement command, and a relative position according to the amount of rotation of the first ring member or the third ring member when the first ring member moves to the second slide position A focus mode switching means for switching between a second manual focus mode for outputting a signal as a focus lens movement command is provided. As a result, when the first ring member is moved to the first slide position, the first ring member is switched to the first manual focus mode, and the second ring member is rotatable by the first ring member. An absolute position signal corresponding to the position can be output as a focus lens movement command, and when the first ring member is moved to the second slide position, it is switched to the second manual focus mode, A relative position signal corresponding to the amount of rotation of the first ring member or the amount of rotation of the third ring member that can be rotated by the first ring member can be output as a focus lens movement command.

  In the lens device according to still another aspect of the present invention, the first ring member and the first ring member are moved in accordance with the movement of the first ring member to the first slide position or the second slide position in the optical axis direction. A clutch portion for mechanically connecting or disconnecting the ring member 2 is provided. As a result, when the first ring member and the second ring member abut, the first ring member and the second ring member are mechanically connected. The rotational force can be reliably transmitted to the second ring member.

  According to the present invention, when the ring member that rotates relative to the lens barrel body and slides in the optical axis direction slides, the ring member is attracted to or biased by another ring member at the moving end. Since they are in contact with each other, a good switching feeling can be obtained when the ring members are in contact with each other.

It is principal part sectional drawing which shows 1st Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the intermediate position of a slide direction It is principal part sectional drawing which shows 1st Embodiment of the lens apparatus which concerns on this invention, and is a figure which shows the state in which the 1st focus ring is located in the end of a slide direction It is principal part sectional drawing which shows 1st Embodiment of the lens apparatus which concerns on this invention, and is a figure which shows the state in which the 1st focus ring is located in the other end of a slide direction It is principal part sectional drawing which shows 2nd Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the intermediate position of a slide direction It is principal part sectional drawing which shows 2nd Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the end of a slide direction It is principal part sectional drawing which shows 2nd Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the other end of a slide direction Enlarged view of the main part of FIG. It is principal part sectional drawing which shows 3rd Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the intermediate position of a slide direction It is principal part sectional drawing which shows 3rd Embodiment of the lens apparatus which concerns on this invention, The figure which shows the state in which the 1st focus ring is located in the end of a slide direction It is principal part sectional drawing which shows 3rd Embodiment of the lens apparatus which concerns on this invention, and is a figure which shows the state in which the 1st focus ring is located in the other end of a slide direction Sectional view of the main part of a conventional lens device The perspective view which shows the state with which the 1st focus ring and 2nd focus ring of the conventional lens apparatus were connected. The perspective view which shows the principal part of the lens barrel main body of the conventional lens apparatus.

  Hereinafter, embodiments of a lens apparatus according to the present invention will be described with reference to the accompanying drawings.

  The lens device according to the present invention is a lens device applied to, for example, consumer video cameras, ENG cameras for television broadcasting, surveillance cameras, and the like.

  A focus lens that changes the focal position of the optical system is disposed so as to be movable in the optical axis direction, and is electrically driven in the optical axis direction by power such as a voice coil motor (VCM).

  The lens device is provided with operation switches such as an AF / MF switching switch and a non-locking AF push switch, and the focus lens can be controlled by operating these switches.

  The AF / MF selector switch manually rotates the autofocus (AF) mode in which the focus lens is automatically moved to adjust the focus so that the contrast of the subject image is maximized, and the first focus ring 20 described later is manually operated. This is a switch for switching between a manual focus (MF) mode for adjusting the focus by moving the focus lens. The AF push switch is a switch that switches to the AF mode only during a period when the key top is pressed (pushed) when the AF / MF switch is switched to the MF mode.

[First Embodiment]
FIG. 1 is a cross-sectional view of a main part showing a first embodiment of a lens apparatus according to the present invention, and shows a state in which a first focus ring 20 is located at an intermediate position in a sliding direction.

  In FIG. 1, a lens barrel main body 10 of the lens apparatus is formed of an aluminum alloy that is a non-magnetic material. The lens barrel main body 10 includes a first focus ring 20 made of a resin such as polycarbonate, and a first focus ring 20. The 2 focus ring 30 and the 3rd focus ring 40 are each arrange | positioned so that rotation is possible.

  The first focus ring 20 is not restricted in rotation range, and is disposed so as to be capable of endless rotation, and is slidable in the optical axis direction (the directions of arrows A and B). Further, the second focus ring 30 is regulated so as to be able to rotate within a range of about 120 degrees by a stopper (not shown), and the third focus ring 40 is not restricted in the rotation range, and is arranged so as to be capable of endless rotation. It is installed.

  A circumferential concave groove 12 having a predetermined width is formed by a part of the outer peripheral surface of the lens barrel body 10 and the second focus ring 30 and the third focus ring 40, and is formed on the lower surface side of the first focus ring 20. A convex portion 20 </ b> A that engages with the concave groove 12 is formed.

  Magnets 22 and 24 are respectively provided on both side surfaces of the convex portion 20A of the first focus ring 20, and on the side surfaces of the second focus ring 30 and the third focus ring 40 facing the magnets 22 and 24, respectively. Are provided with magnets 32 and 42, respectively.

  Here, the directions of the magnetic poles of the pair of magnets 22 and 32, and the pair of magnets 24 and 42 are determined so that the attractive force acts on each other (the N pole and the S pole face each other). Are arranged. In addition, at least one of the pair of magnets 22 and 32 and the pair of magnets 24 and 42 is formed in a ring shape, thereby regardless of the rotational position of the first focus ring 20. An attractive force can be obtained between the magnets.

  Further, gears 34 and 44 are formed around the second focus ring 30 and the third focus ring 40, respectively. These gears 34 and 44 are respectively absolute position detection sensors (absolute encoders), not shown. And a gear of a detection shaft of a relative position detection type sensor (incremental encoder).

  The absolute rotation position of the second focus ring 30 can be detected by the absolute position detection sensor, and the relative rotation amount of the third focus ring 40 can be detected by the relative position detection sensor. It has become.

  Next, the operation of the lens apparatus according to the first embodiment having the above-described configuration will be described.

  FIG. 1 shows a state in which the first focus ring 20 is located at an intermediate position in the sliding direction (arrow AB direction). In this state, since the distance between the magnet 22 and the magnet 32 and the distance between the magnet 24 and the magnet 42 are the same, they are attracted to each other with the same magnetic force, but this is an unstable state. The first focus ring 20 does not stop at this intermediate position.

  2 and 3 are cross-sectional views showing the main part of the lens device according to the first embodiment of the present invention. The first focus ring 20 is a first slide position at one end in the slide direction (arrow A direction). And a state where the first focus ring 20 is located at the second slide position at the other end in the slide direction (arrow B direction).

  As shown in FIG. 2, when the first focus ring 20 is manually slid in the direction of arrow A and exceeds the intermediate position shown in FIG. 1, the first focus ring 20 is placed between the magnet 22 and the magnet 32. It is attracted by the generated magnetic force and moves to the moving end (first slide position) in the direction of arrow A.

  At the moving end of the first focus ring 20 in the arrow A direction, the magnet 22 on the first focus ring 20 side contacts the magnet 34 on the second focus ring 30 side, and the magnet 22 and the magnet 34 are attracted and fixed. When the magnets 22 and 32 are brought into contact with each other by the attractive force, the fingertip touching the first focus ring 20 is transmitted with a “click” feeling, and a good switching feeling is obtained.

  Here, when the first focus ring 20 is rotated, the second focus ring 30 adsorbed to the first focus ring 20 by magnetic force is simultaneously rotated. Since the rotation range of the second focus ring 30 is limited to about 120 ° as described above, the first focus ring 20 can be rotated within the limited rotation range.

  On the other hand, the first focus ring 20 is slid in the direction of arrow B against the attractive force between the magnets 22 and 32 from the state shown in FIG. 2, and the first focus ring 20 is moved to the intermediate position shown in FIG. 3, as shown in FIG. 3, it is attracted by the magnetic force generated between the magnet 24 and the magnet 42 and moves to the moving end (second slide position) in the arrow A direction.

  At the moving end of the first focus ring 20 in the arrow B direction, the magnet 24 on the first focus ring 20 side abuts on the magnet 42 on the third focus ring 40 side, and the magnet 24 and the magnet 42 are attracted and fixed. When the magnets 24 and 42 are brought into contact with each other by the attractive force, a touch of “click” is transmitted to the fingertip touching the first focus ring 20, and a good switching feeling is obtained.

  Here, when the first focus ring 20 is rotated, the third focus ring 40 adsorbed to the first focus ring 20 by magnetic force is simultaneously rotated. As described above, the rotation range of the third focus ring 40 is not restricted, and the third focus ring 40 is disposed endlessly (without an end end) so as to be rotatable. Therefore, the first focus ring 20 is coupled with the third focus ring 40. Can be rotated endlessly.

  By the way, as described above, when the mode is switched to the MF mode by the AF / MF switching switch, the movement control of the focus lens by the manual operation of the first focus ring 20 becomes possible. When the mode is switched to the MF mode, switching between the full MF mode (with end end) and the AF / MF mode (without end end) is performed according to the slide position of the first focus ring 20.

  The slide position of the first focus ring 20 (the first slide position shown in FIG. 2 and the second slide position shown in FIG. 3) is turned ON / OFF according to the slide position of the first focus ring 20. It can be detected by a detection signal of a detection means (not shown) such as a photo interrupter or a micro switch. The focus mode switching means switches to the full MF mode (with end end) when the detection means detects that the first focus ring 20 is at the first slide position shown in FIG. When it is detected that the focus ring 20 is at the second slide position shown in FIG. 3, the mode is switched to the AF / MF mode (no end end).

  As shown in FIG. 2, when the first focus ring 20 and the second focus ring 30 are connected by the magnets 22 and 32 and the MF mode is switched to the full MF mode (with end end), the second focus ring 30 The focus lens is driven and controlled on the basis of an absolute position signal (a signal for instructing an imaging distance within a range from close to infinity) from an absolute position detection type sensor connected to the gear 34. When the mode is switched to the full MF mode in this way, the focus lens can be moved to a position corresponding to a desired shooting distance by manually operating the first focus ring 20. Since the first focus ring 20 is connected to the second focus ring 30 with an end whose rotation range is regulated by a stopper, the rotation range is regulated similarly to the second focus ring 30. It can be rotated within a rotation range corresponding to the infinity end from the closest end.

  In the full MF mode, the rotation range of the first focus ring 20 is limited via the second focus ring 30, and the operator can focus by operating feeling when the first focus ring 20 reaches the end end. It can be recognized that the lens has reached the near end or the infinity end. Such a focus operation using only the first focus ring 20 is a method familiar to professional photographers and the like.

  On the other hand, as shown in FIG. 3, when the first focus ring 20 and the third focus ring 40 are connected by the magnets 24 and 42 and the MF mode is switched to the AF / MF mode (no end end), the first focus ring Focus control can be performed by appropriately using the MF mode in which the focus lens is moved by rotating the ring 20 and the AF mode in which the AF push switch is pressed as described above.

  That is, when the first focus ring 20 is operated in the AF / MF mode, the relative position signal from the relative position detection type sensor connected to the gear 44 of the third focus ring 40 rotating together with the first focus ring 20 is obtained. Based on this, the focus lens can be moved by an amount corresponding to the amount of rotation of the first focus ring 20.

  When the AF push switch is pressed during AF / MF mode, the AF lens is temporarily switched to AF mode. After that, when the AF push switch is released and switched to MF mode, the position of the focus lens automatically focused by the AF mode is changed. As a result, the focus lens can be displaced by the amount of operation of the first focus ring 20, which improves usability.

  In the first embodiment, the pair of magnets 22 and 32, and the magnet 24 and magnet 42 are used, but one of the pair of magnets is made of a soft magnetic material such as iron instead of the magnet. It is good also as a magnetic member.

[Second Embodiment]
FIG. 4 is a cross-sectional view of an essential part showing a second embodiment of the lens apparatus according to the present invention, and shows a state in which the first focus ring 120 is located at an intermediate position in the sliding direction.

  In the lens apparatus of the first embodiment described above, the magnets that attract each other are provided between the rings of the first focus ring 20, the second focus ring 30, and the third focus ring 40. As shown in FIG. 4, the lens apparatus mainly includes a magnet 112 and a magnet 122 that repel each other between the lens barrel body 110 and the first focus ring 120. Is different.

  The structure of the first focus ring 120, the second focus ring 130, and the third focus ring 140 attached to the lens barrel body 110 is the same as that of the first focus ring 20 and the second focus ring of the first embodiment. 30 and the third focus ring 40.

  A magnet 112 is provided on the outer peripheral surface of the lens barrel body 110 (the outer peripheral surface between the second focus ring 130 and the third focus ring 140).

  On the other hand, a magnet 122 is disposed on the inner peripheral surface of the first focus ring 120 (position facing the magnet 112).

  As shown in FIG. 4, the first focus ring 120 is located at an intermediate position in the sliding direction (arrow AB direction). In this state, the magnet 112 on the lens barrel body 110 side and the first focus ring 120 side are located. The magnetic poles of the same polarity are opposed to the magnet 122 so as to repel each other. Further, at least one of the magnet 112 and the magnet 122 is formed in a ring shape, so that a magnetic force such as a repulsive force can be obtained between the magnets regardless of the rotational position of the first focus ring 120. It has become.

  In the second embodiment, serrated mechanical clutch portions 124 and 126 are formed on both end faces of the first focus ring 120, and the inner sides of the second focus ring 130 and the third focus ring 140. On the other end face, serrated clutch portions 132 and 142 that mesh with the clutch portions 124 and 126 are formed.

  Next, the operation of the lens apparatus according to the second embodiment having the above-described configuration will be described.

  FIG. 4 shows a state in which the first focus ring 20 is located at an intermediate position in the sliding direction (arrow AB direction) as described above. In this state, the magnet 112 and the magnet 122 repel in the radial direction of the lens barrel main body 110, and no repulsive force is generated in the sliding direction (arrow AB direction) of the first focus ring 120. As in the first embodiment, since this state is unstable, the first focus ring 20 does not normally stop at this intermediate position.

  FIG. 5 and FIG. 6 are cross-sectional views showing the main part of a second embodiment of the lens apparatus according to the present invention, respectively, where the first focus ring 120 is at the first slide position at one end in the slide direction (arrow A direction). And a state where the first focus ring 120 is located at the second slide position at the other end in the slide direction (arrow B direction).

  As shown in FIG. 5, when the first focus ring 120 is manually slid in the direction of arrow A and exceeds the intermediate position shown in FIG. 4, the first focus ring 120 is repulsive between the magnet 112 and the magnet 122. To move to the moving end in the direction of arrow A.

  At the moving end of the first focus ring 120 in the arrow A direction, the clutch portion 124 on the first focus ring 120 abuts on the clutch portion 132 on the second focus ring 130 side, and the clutch portions 124 and 132 are engaged. When the clutch portions 124 and 132 are engaged, the first focus ring 120 is urged toward the second focus ring 130 by the magnetic force of the magnets 112 and 122 as shown in FIG.

  FIG. 7 is an enlarged view of a main part of FIG. As shown in FIG. 7, between the magnet 112 and the magnet 122, a repulsive force is generated between the magnetic poles of the same polarity, and an attracting force is generated between the magnetic poles of different polarities. The urging force that contacts the second focus ring 130 is applied.

  A good switching feeling can be obtained via the first focus ring 120 when the magnets 112 and 122 are brought into contact with each other by the urging force.

  Here, when the first focus ring 120 is rotated, the first focus ring 120 is biased by a magnetic force, and the second focus ring 130 mechanically connected by the clutch portions 124 and 132 can be rotated simultaneously. Accordingly, an absolute position signal corresponding to the rotation position of the second focus ring 130 can be output.

  Since the first focus ring 120 is mechanically coupled to the second focus ring 130 by the clutch portions 124 and 132, when the second focus ring 130 reaches the end end, the first focus ring 120 can be securely connected. Can be stopped. Thereby, the operational feeling when the first focus ring 120 reaches the end end is obtained.

  On the other hand, the first focus ring 120 is slid in the direction of arrow B against the urging force of the magnets 112 and 122 from the state shown in FIG. 5, and the first focus ring 120 exceeds the intermediate position shown in FIG. As shown in FIG. 6, the first focus ring 120 moves to the moving end in the arrow B direction by the magnetic force of the magnets 112 and 122 (the magnetic force in the direction opposite to that in the case of FIG. 5).

  Further, when the first focus ring 120 is slid, a large operating force is required as the first focus ring 120 approaches the intermediate position. When the first focus ring 120 exceeds the intermediate position, the operating force is not required rapidly and the first focus is increased. The ring 120 moves to the moving end in the arrow B direction by the magnetic force of the magnets 112 and 122. Due to the change in the operating force of the first focus ring 120, a good switching feeling can be obtained.

  At the moving end of the first focus ring 120 in the arrow B direction, the clutch portion 126 on the first focus ring 120 abuts on the clutch portion 142 on the third focus ring 140 side, and the clutch portions 126 and 142 are engaged. When the clutch portions 126 and 142 are engaged, the first focus ring 120 is urged toward the third focus ring 140 by the magnetic force of the magnets 112 and 122 as shown in FIG. It is mechanically connected to the third focus ring 140 via

  Here, when the first focus ring 120 is rotated, the third focus ring 140 that is urged by the magnetic force to the first focus ring 120 and mechanically connected by the clutch portions 126 and 142 can be simultaneously rotated. As a result, a relative position signal corresponding to the rotation amount of the third focus ring 140 can be output.

  At least one of the magnets 112 and 122 is formed in a ring shape, so that a magnetic force such as a repulsive force can be obtained between the magnets regardless of the rotational position of the first focus ring 20. It has become.

  In the second embodiment, the clutch portions 124 and 132 are provided on the end surface where the first focus ring 120 and the second focus ring 130 come into contact with each other. By allowing the rotational force of the first focus ring 120 to be transmitted to the second focus ring 130 by the frictional force generated on the contact surface between the ring 120 and the second focus ring 130, the clutch portions 124 and 132 are omitted. It may be. Similarly, the clutch portions 126 and 142 provided on the end surfaces where the first focus ring 120 and the second focus ring 130 abut can be omitted.

[Third Embodiment]
FIG. 8 is a cross-sectional view of an essential part showing a third embodiment of the lens apparatus according to the present invention, and shows a state in which the first focus ring 120 is located at an intermediate position in the sliding direction.

  The lens apparatus according to the third embodiment is a combination of the first embodiment and the second embodiment. In FIG. 8, the same reference numerals are given to portions common to the first embodiment and the second embodiment, and detailed description thereof is omitted.

  As shown in FIG. 8, the first focus ring 220 of the third embodiment is located on the inner peripheral surface of the first focus ring 20 of the first embodiment (position facing the magnet 112 on the lens barrel body 110 side). The difference from the first focus ring 20 of the first embodiment is that a magnet 122 is provided.

  As a result, the first focus ring 220 of the lens device of the third embodiment has the magnets 22 and 24 on both end faces of the first focus ring 220, the second focus ring 30 and the first focus ring 220, as in the first embodiment. A suction force generated between the magnets 32 and 42 on the three focus ring 40 side is applied, and the magnet 112 provided on the outer peripheral surface of the lens barrel main body 110 and the first focus ring 220 are applied as in the second embodiment. An urging force in the sliding direction by a magnetic force (repulsive force or the like) generated between the magnet 122 and the magnet 122 provided on the inner peripheral surface is applied.

  Next, the operation of the lens apparatus according to the third embodiment having the above-described configuration will be described.

  FIG. 8 shows a state in which the first focus ring 220 is located at an intermediate position in the sliding direction (arrow AB direction). Since this state is an unstable state as in the first and second embodiments, the first focus ring 220 does not normally stop at this intermediate position.

  FIG. 9 and FIG. 10 are cross-sectional views showing the principal part of a third embodiment of the lens apparatus according to the present invention, respectively, and the first focus ring 220 is the first slide position at one end in the slide direction (arrow A direction). And a state where the first focus ring 220 is located at the second slide position at the other end in the slide direction (arrow B direction).

  As shown in FIG. 9, when the first focus ring 220 is manually slid in the direction of arrow A and exceeds the intermediate position shown in FIG. 8, the first focus ring 220 is moved between the magnet 22 and the magnet 32. It moves to the moving end in the direction of arrow A by the attractive force and the repulsive force between the magnet 112 and the magnet 122.

  At the moving end of the first focus ring 220 in the direction of arrow A, the magnet 22 on the first focus ring 220 side contacts the magnet 34 on the second focus ring 30 side, and the magnet 22 and the magnet 34 are attracted and fixed. When the magnets 22 and 32 are brought into contact with each other by the attractive force, the fingertip touching the first focus ring 220 is transmitted with a “click” feeling, and a good switching feeling is obtained.

  On the other hand, the first focus ring 220 is slid in the direction of arrow B against the attractive force between the magnet 22 and the magnet 32 and the magnetic force (repulsive force etc.) between the magnet 112 and the magnet 122 from the state shown in FIG. When the first focus ring 220 is operated and exceeds the intermediate position shown in FIG. 8, as shown in FIG. 10, the magnetic force (attraction force) generated between the magnet 24 and the magnet 42, and the magnet 112 and the magnet 122 are displayed. And is moved to the moving end (second slide position) in the direction of arrow B.

  At the moving end of the first focus ring 220 in the arrow B direction, the magnet 24 on the first focus ring 220 side contacts the magnet 42 on the third focus ring 40 side, and the magnet 24 and the magnet 42 are attracted and fixed. When the magnets 24 and 42 are brought into contact with each other by the attractive force, a touch of “click” is transmitted to the fingertip touching the first focus ring 20, and a good switching feeling is obtained.

  Further, when the first focus ring 220 is slid, a large operating force is required as the first focus ring 220 approaches the intermediate position. When the first focus ring 220 exceeds the intermediate position, the operating force is not required rapidly, and the first focus The ring 220 moves to the moving end in the arrow B direction by the magnetic force between the magnet 24 and the magnet 42 and the magnetic force between the magnet 112 and the magnet 122. Due to the change in the operating force of the first focus ring 220, a good switching feeling can be obtained.

[Others]
In the above embodiment, a permanent magnet is used as a magnet. However, the present invention is not limited to this, and an electromagnet may be used.

  The third focus ring is formed with a gear 44 that is connected to the relative position detection type sensor, but a gear that is always connected to the relative position detection type sensor is formed on the first focus ring side. Also good. In this case, the third focus ring generates a switching feeling when the first focus ring is switched to the AF / MF mode (no end end) and functions as a ring member that holds the first focus ring. become. Further, the relative position detection type sensor connected to the first focus ring is operable when switched to the AF / MF mode (no end end) by the first focus ring.

  Further, in this embodiment, the click mechanism of the focus ring has been described. However, the present invention is not limited to this, and any ring member that rotates around the lens barrel body and slides in the optical axis direction can be used. It can be applied as a click mechanism in the sliding direction.

  Moreover, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 10, 110 ... Lens barrel main body 20, 120, 220 ... 1st focus ring, 22, 24, 32, 42, 112, 122 ... Magnet, 30, 130 ... 2nd focus ring, 40, 140 ... 3rd focus Ring, 34, 44 ... gear, 124, 126, 132, 142 ... clutch part

Claims (7)

A first ring member arranged to be capable of endless rotation with respect to the lens barrel main body and slidable between a first slide position and a second slide position in the optical axis direction; ,
When the first ring member is moved to the first slide position, the second ring member is rotatably arranged only within a predetermined rotation range with respect to the lens barrel body. A second ring member arranged to be in contact with one side surface of the first ring member;
A third ring member arranged to be capable of endless rotation with respect to the lens barrel body, and when the first ring member moves to the second slide position, A third ring member arranged to be in contact with the other side surface;
A first magnetic member provided on both end faces of the first ring member in the sliding direction;
A second magnetic member provided on a surface of the second ring member and a third ring member facing the end surface of the first ring member;
At least one of the first and second magnetic members is composed of a magnet, and the first ring member is moved when the first ring member moves to the first slide position or to the second slide position. It is configured to rotate in conjunction with the second ring member or the third ring member by being attracted to the second ring member or the third ring member by a magnetic force during movement. Lens device. A first ring member arranged to be capable of endless rotation with respect to the lens barrel main body and slidable between a first slide position and a second slide position in the optical axis direction; ,
When the first ring member is moved to the first slide position, the second ring member is rotatably arranged only within a predetermined rotation range with respect to the lens barrel body. A second ring member arranged to be in contact with one side surface of the first ring member;
A third ring member arranged to be capable of endless rotation with respect to the lens barrel body, and when the first ring member moves to the second slide position, A third ring member arranged to be in contact with the other side surface;
A pair of first and second magnets comprising a first magnet provided on the outer peripheral surface of the lens barrel body and a second magnet provided on the inner peripheral surface of the first ring member; When the first ring member is located at an intermediate position between the first slide position and the second slide position, an S pole and an N pole are provided so as to repel each other, and the first ring First and second magnets that are biased by a magnetic force to press the first ring member against the end surface of the second ring member or the end surface of the third ring member when the member is displaced from the intermediate position; ,
A lens device comprising: A first ring member arranged to be capable of endless rotation with respect to the lens barrel main body and slidable between a first slide position and a second slide position in the optical axis direction; ,
When the first ring member is moved to the first slide position, the second ring member is rotatably arranged only within a predetermined rotation range with respect to the lens barrel body. A second ring member arranged to be in contact with one side surface of the first ring member;
A third ring member arranged to be capable of endless rotation with respect to the lens barrel body, and when the first ring member moves to the second slide position, A third ring member arranged to be in contact with the other side surface;
A pair of first and second magnets comprising a first magnet provided on the outer peripheral surface of the lens barrel body and a second magnet provided on the inner peripheral surface of the first ring member; When the first ring member is located at an intermediate position between the first slide position and the second slide position, an S pole and an N pole are provided so as to repel each other, and the first ring First and second magnets that are biased by a magnetic force to press the first ring member against the end surface of the second ring member or the end surface of the third ring member when the member is displaced from the intermediate position; ,
A first magnetic member provided on both end faces of the first ring member in the sliding direction;
A second magnetic member provided on a surface of the second ring member and a third ring member facing the end surface of the first ring member;
At least one of the first and second magnetic members is composed of a magnet, and the first ring member is moved when the first ring member moves to the first slide position or to the second slide position. A lens device that is attracted to the second ring member or the third ring member by a magnetic force during movement.   4. The lens device according to claim 1, wherein at least one of the first magnetic member and the second magnetic member is formed in a ring shape. 5.   4. The lens device according to claim 2, wherein at least one of the first magnet and the second magnet is formed in a ring shape.   A first manual focus mode for outputting an absolute position signal corresponding to a rotation position of the second ring member as a focus lens movement command when the first ring member is moved to the first slide position; When the first ring member moves to the second slide position, a relative position signal corresponding to the amount of rotation of the first ring member or the third ring member is output as a focus lens movement command. The lens apparatus according to claim 1, further comprising a focus mode switching unit that switches between a manual focus mode and a manual focus mode.   As the first ring member moves to the first slide position or the second slide position in the optical axis direction, the first ring member and the second ring member are mechanically connected or disconnected. The lens device according to any one of claims 1 to 6, further comprising a clutch portion.

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