JP5555196B2 - Lens device - Google Patents

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. 12 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.

  Sawtooth-shaped clutch portions 2A and 3A are formed on end faces where the first focus ring 2 and the second focus ring 3 face each other. In the state shown in FIG. 13, 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. 14, 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 kamaboko shape is formed on the upper surface of the center portion thereof. 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. 12, 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 click mechanism comprising an electromagnet provided on an outer peripheral surface of a lens barrel body and a permanent magnet provided on an inner peripheral surface of the first ring member, wherein the first ring member is the first slide. When the first ring member is displaced from the intermediate position, the S and N poles are provided so as to repel each other when positioned at an intermediate position between the position and the second slide position. A click mechanism that urges the ring member by magnetic force so as to press the end surface of the second ring member or the end surface of the third ring member, and switching of the first ring member by adjusting the magnetic force of the electromagnet. And an operation feeling adjusting means for adjusting the operation feeling at the time.

  According to an aspect of the present invention, the click mechanism including the electromagnet provided on the outer peripheral surface of the lens barrel body and the permanent magnet provided on the inner peripheral surface of the ring member is the first ring member. When the first ring member is positioned between the first slide position and the second slide position, an S pole and an N pole are provided to repel each other, and when the first ring member is displaced from the intermediate position, The first ring member can be 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. 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 has a magnetic force between the electromagnet and the permanent magnet. Is moved to the other slide position, abutted against the second or third ring member, and biased by 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. Furthermore, the operation feeling at the time of switching of the first ring member can be arbitrarily adjusted by adjusting the magnetic force of the electromagnet by the operation feeling adjusting means.

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

  In the lens device according to still another aspect of the present invention, the first magnetic member provided on both end surfaces in the sliding direction of the first ring member, the second ring member, and the third ring member A second magnetic member provided on a surface opposite to an end surface of the first ring member, wherein at least one of the first and second magnetic members is constituted by a permanent magnet, and the first ring member Is attracted to the second ring member or the third ring member by a magnetic force when the first ring member moves to the first slide position or to the second slide position. Yes.

  According to still another aspect of the present invention, a first magnetic member provided on one end face of the first ring member and a first end face of the first ring member of the second ring member are provided. The second magnetic member provided on the opposing surface comes into contact with the first magnetic member and can be attracted by the magnetic force of at least one of the first and second magnetic members. Similarly, the first ring member is attached to the second magnetic member. The first magnetic member provided on the other end surface of the first ring member and the surface of the third ring member facing the other end surface of the first ring member The provided second magnetic member comes into contact with the first magnetic member and can be attracted by the magnetic force of at least one of the first and second magnetic members. 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.

  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. Thus, 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, 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.

  In the lens device according to still another aspect of the present invention, when the first ring member is in the first slide position or the second slide position, the energization to the electromagnet is turned off or a weak current is applied. When the first ring member is moved from the first slide position or the second slide position, control means for turning on the energization of the electromagnet is provided. If the electromagnet is always energized, the power consumption becomes excessive, but the power consumption can be reduced by energizing only when the first slide member slides.

  In the lens device according to still another aspect of the present invention, detection in which movement of the first ring member from the first slide position or the second slide position is detected by an induced electromotive force generated in a circuit of the electromagnet. It is characterized by having means. When the first ring member is slid, the permanent magnet is moved at the same time, and an induced electromotive force is generated in the coil of the electromagnet. The detection means detects the movement of the first ring member by detecting the induced electromotive force.

  In the lens device according to still another aspect of the present invention, the operation feeling adjusting means further includes means for changing a rising characteristic of energization to the electromagnet when the electromagnet is turned on. When the electromagnet is turned on, the initial operation feeling when the first ring member is moved can be adjusted by making it possible to change the rising characteristic of energization to the electromagnet.

  According to the present invention, the ring member is rotated by the magnetic force generated between the electromagnet capable of adjusting the magnetic force and the permanent magnet during the sliding movement of the ring member that rotates relative to the lens barrel body and slides in the optical axis direction. Since the switching force at the time of switching during the slide movement can be adjusted, it is possible to obtain the switching feeling that the operator likes.

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 2 is an enlarged view of the main part of FIG. Circuit diagram showing a first embodiment of an electromagnet Circuit diagram showing a second embodiment of an electromagnet Flow chart showing control operation of electromagnet Circuit diagram showing a third embodiment of an electromagnet 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 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 (permanent magnets) 22 and 24 are disposed on both side surfaces of the convex portion 20A of the first focus ring 20, respectively, and a second focus ring 30 and a third focus ring facing the magnets 22 and 24, respectively. Magnets (permanent magnets) 32 and 42 are disposed on the side surfaces of 40.

  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.

  An electromagnet 14 is provided on the outer peripheral surface of the lens barrel body 110 (the outer peripheral surface between the second focus ring 30 and the third focus ring 40).

  On the other hand, a magnet (permanent magnet) 26 is disposed on the inner peripheral surface (position facing the electromagnet 14) of the first focus ring 20. In this embodiment, the electromagnet 14 on the lens barrel body 10 side is configured such that when energized, the upper side is the N pole and the lower side is the S pole in FIG. 1, and the magnet 26 on the first focus ring 20 side is configured. Has an N pole on the side facing the electromagnet 14.

  As shown in FIG. 1, the first focus ring 20 is located at an intermediate position in the sliding direction (arrow AB direction). In this state, the electromagnet 14 on the lens barrel body 10 side and the first focus ring 20 side are located. The magnetic poles of the same polarity are opposed to the magnet 26 so as to repel each other. In addition, at least one of the electromagnet 14 and the magnet 26 is formed in a ring shape, so that a repulsive force or the like is generated between the electromagnet 14 and the magnet 26 regardless of the rotational position of the first focus ring 20. Magnetic force can be obtained.

  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 gap between the magnet 22 and the magnet 32 and the gap between the magnet 24 and the magnet 42 are the same, they are attracted and balanced with the same magnetic force, but this state is unstable. In addition, the energized electromagnet 14 and the magnet 26 face each other with the same polarity magnetic poles (N poles) and generate a repulsive force, so this state is unstable. Therefore, normally, 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.

  Similarly, when the first focus ring 20 exceeds the intermediate position shown in FIG. 1, the first focus ring 20 moves to the moving end in the direction of arrow A due to the repulsive force between the electromagnet 14 and the magnet 26.

  FIG. 4 is an enlarged view of a main part of FIG. As shown in FIG. 4, a repulsive force is generated between the electromagnet 14 and the magnet 26 by the magnetic poles having the same polarity, and the repulsive force causes the first focus ring 20 to abut against the second focus ring 30. Will be added.

  Thus, the first focus ring 20 is attracted by the magnetic force generated between the magnet 22 and the magnet 32 and moved to the first slide position in the direction of arrow A by the repulsive force between the electromagnet 14 and the magnet 26. . At the moving end of the first focus ring 20 in the direction of arrow A, the magnet 22 on the first focus ring 20 side contacts the magnet 32 on the second focus ring 30 side, and the magnet 22 and the magnet 32 are attracted and fixed. . At the time of contact by the attractive force between the magnets 22 and 32 and the biasing force of the electromagnet 14 and the magnet 26, the fingertip touching the first focus ring 20 is transmitted with a “click” feeling, and a good switching feeling is obtained. can get.

  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, from the state shown in FIG. 2, the first focus ring 20 is slid in the direction of arrow B against the attracting force of the magnet 22 and the magnet 32 and the biasing force of the electromagnet 14 and the magnet 26. When 20 exceeds the intermediate position shown in FIG. 1, the first focus ring 20 is attracted by the magnetic force generated between the magnet 24 and the magnet 42 as shown in FIG. The repulsive force moves to the movement end (second slide position) in the direction of arrow B. Then, at the moving end of the first focus ring 20 in the direction of arrow B, 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. . At the time of contact by the attractive force between the magnets 24 and 42 and the biasing force of the electromagnet 14 and the magnet 26, the fingertip touching the first focus ring 20 is transmitted with a “click” feeling, and a good switching feeling is obtained. can get.

  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).

  When the first focus ring 20 and the second focus ring 30 are connected as shown in FIG. 2 and the MF mode is switched to the full MF mode (with end end), the first focus ring 20 and the second focus ring 30 are connected to the gear 34 of the second focus ring 30. The focus lens is driven and controlled on the basis of an absolute position signal from the absolute position detection type sensor (a signal for instructing an imaging distance within a range from close to infinity). 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, when the first focus ring 20 and the third focus ring 40 are connected as shown in FIG. 3 and the MF mode is switched to the AF / MF mode (no end end), the first focus ring 20 is rotated. Accordingly, the focus control can be performed by appropriately using the MF mode in which the focus lens is moved 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.

<Control of electromagnet>
FIG. 5 is a circuit diagram showing a first embodiment of the electromagnet 14. As shown in FIG. 5, when the switch 50 is turned on, a direct current flows from the direct current power source 52 to the coil 14A of the electromagnet 14 via the variable resistor 54, and the electromagnet 14 is magnetized to generate a magnetic force. For example, the switch 50 can be turned ON / OFF in synchronization with ON / OFF of a power switch of a camera or the like to which the lens device is attached.

  The variable resistor 54 can change the resistance value stepwise or continuously according to the operation of an operation feeling adjuster (not shown). With this variable resistor 54, the current flowing through the coil 14A of the electromagnet 14 can be adjusted, and the magnetic force generated from the electromagnet 14 can be adjusted. That is, the switching force when the first focus ring 20 is slid can be made variable, and can be adjusted so as to obtain the switching feeling desired by the operator.

  FIG. 6 is a circuit diagram showing a second embodiment of the electromagnet 14. In addition, the same code | symbol is attached | subjected to the part which is common in the circuit shown in FIG. 5, and the detailed description is abbreviate | omitted.

  The circuit of the electromagnet 14 shown in FIG. 6 is different from the first embodiment shown in FIG. 5 in that an ammeter 60 and a control unit 62 are added.

  If the electromagnet 14 is always energized, the power consumption becomes excessive, but the power consumption can be reduced by energizing only when the first focus ring 20 slides.

  The ammeter 60 detects a change in the current value due to the induced electromotive force generated when the first focus ring 20 is slid in a state where the energization to the electromagnet 14 is turned off. When the control unit 62 detects the sliding movement of the first focus ring 20 based on the change in the current value detected by the ammeter 60, the control unit 62 turns on the switch 50 for a predetermined time.

  FIG. 7 is a flowchart showing the control operation of the electromagnet 14 by the control unit 62.

  As shown in FIG. 7, the control unit 62 first turns on the electromagnet 14 for a predetermined time (steps S10 and S12). The certain time is an appropriate time longer than the time during which the first focus ring 20 is slid.

  After the electromagnet 14 is turned on for a predetermined time, the electromagnet 14 is turned off (step S14). Thereafter, the control unit 62 detects whether or not an induced electromotive force has been generated based on the detected current from the ammeter 60 (step S16). And if it detects that the induced electromotive force generate | occur | produced, it will judge that the 1st focus ring 20 started the slide movement, it changes to step S10, and the electromagnet 14 is turned ON. Thereby, a repulsive force is generated between the electromagnet 14 and the magnet on the first focus ring 20 side, so that a switching feeling is generated.

  In step S14, the electromagnet 14 is turned off to reduce the power consumption. However, the present invention is not limited to this, and the electromagnet 14 is switched to a weak current, thereby reducing the power consumption. Good. Further, the first focus ring 20 detects whether or not the first focus ring 20 has started sliding movement depending on whether or not induced electromotive force is generated. However, the present invention is not limited to this, and the first slide position of the first focus ring 20 and Based on the detection output of the detector that detects the second slide position, it may be detected whether or not the first focus ring 20 has started the slide movement.

  FIG. 8 is a circuit diagram showing a third embodiment of the electromagnet 14. The parts common to the circuit shown in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The circuit of the electromagnet 14 shown in FIG. 8 is different from the second embodiment shown in FIG. 6 in that a CR integration circuit using capacitors C1 and C2 and a resistor R and switches S1 and S2 are added.

  The operator can select ON / OFF of the switches S1 and S2 as appropriate, and set the rising characteristics of energization to the electromagnet 14. Now, when the capacitance of the capacitors C1 and C2 is larger than C1, when the switches S1 and S2 are both OFF, the energization rises fastest, and then only the switch S1 is ON and only the switch S2 is ON The rise of energization is delayed in the order that the switches S1 and S2 are both ON.

  In this way, by appropriately selecting ON / OFF of the switches S1 and S2, the rising characteristic of energization to the electromagnet 14 is set, that is, the initial operation feeling when the first focus ring 20 is moved is adjusted. be able to.

[Second Embodiment]
FIG. 9 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 device of the first embodiment described above, 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. The lens device is different in that a clutch portion is provided instead of a magnet.

  That is, serrated mechanical clutch portions 124 and 126 are formed on both end surfaces of the first focus ring 120, and the clutches are disposed on the inner end surfaces of the second focus ring 130 and the third focus ring 140. Sawtooth-shaped clutch portions 132 and 142 that mesh with the 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. 9 shows a state in which the first focus ring 120 is located at an intermediate position in the sliding direction (arrow AB direction). In this state, the electromagnet 14 on the lens barrel body 10 side and the magnet 26 on the first focus ring 120 side repel in the radial direction of the lens barrel body 110, and the sliding direction of the first focus ring 120 (the direction of arrow AB) No repulsive force has been generated. Note that, as in the first embodiment, since this state is unstable, the first focus ring 120 does not normally stop at this intermediate position.

  FIG. 10 and FIG. 11 are cross-sectional views showing the main part of a second embodiment of the lens apparatus according to the present invention, respectively, and 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. 10, when the first focus ring 120 is manually slid in the direction of arrow A and exceeds the intermediate position shown in FIG. 9, the first focus ring 120 is repulsive between the electromagnet 14 and the magnet 26. 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. In the state where the clutch portions 124 and 132 are engaged, the first focus ring 120 is urged toward the second focus ring 130 by the repulsive force between the electromagnet 14 and the magnet 26 as shown in FIG.

  When the electromagnet 14 and the magnet 26 are brought into contact with each other by an urging force, a good switching feeling can be obtained through the first focus ring 120.

  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 electromagnet 14 and the magnet 26 from the state shown in FIG. 10, and the first focus ring 120 moves to the intermediate position shown in FIG. If it exceeds, as shown in FIG. 11, the 1st focus ring 120 will move to the moving end of the arrow B direction by the repulsive force of the electromagnet 14 and the magnet 26 (repulsive force opposite to the case of FIG. 10).

  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 repulsive force between the electromagnet 14 and the magnet 26. 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. In the state where the clutch portions 126 and 142 are engaged, the first focus ring 120 is urged toward the third focus ring 140 side by the repulsive force between the electromagnet 14 and the magnet 26, and the clutch portions 126 and 142 are interposed. The third focus ring 140 is mechanically connected.

  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.

  In the second embodiment, at the first slide position or the second slide position of the first focus ring 120, the electromagnet 14 is connected so that the clutch portions 124 and 132 or the clutch portions 126 and 142 are securely connected. It is preferable to always energize or to allow a weak current to always flow.

[Others]
In the above embodiment, the third focus ring is formed with the gear 44 connected to the relative position detection type sensor, but the first focus ring is formed with a gear that is always connected to the relative position detection type sensor. You may do it. 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.

  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, 14 ... Electromagnet, 20, 120 ... First focus ring, 22, 24, 26, 32, 42 ... Magnet (permanent magnet), 30, 130 ... Second focus ring, 40, 140 3rd focus ring, 34, 44 ... Gear, 50 ... Switch, 52 ... DC power supply, 54 ... Variable resistance, 60 ... Ammeter, 62 ... Control part, 124, 126, 132, 142 ... Clutch part

Claims (9)

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 click mechanism comprising an electromagnet provided on an outer peripheral surface of the lens barrel body and a permanent magnet provided on an inner peripheral surface of the first ring member, wherein the first ring member is the first ring member. When positioned at an intermediate position between the 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 deviates from the intermediate position, A click mechanism that urges the ring member by magnetic force so as to press the end member of the second ring member or the end surface of the third ring member;
An operation feeling adjustment means for adjusting an operation feeling when switching the first ring member by adjusting the magnetic force of the electromagnet;
A lens device comprising:   The lens device according to claim 1, wherein at least one of the electromagnet and the permanent magnet is formed in a ring shape. 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 constituted by a permanent magnet, and the first ring member is moved to the first slide position or to the second slide position. 3. The lens device according to claim 1, wherein the lens device is attracted to the second ring member or the third ring member by a magnetic force during movement of the lens device.   The lens device according to claim 3, wherein at least one of the first magnetic member and the second magnetic member 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 claim 1, further comprising a clutch portion to be operated.   When the first ring member is in the first slide position or the second slide position, the energization to the electromagnet is turned off or switched to a weak current, and the first ring member is moved to the first position. The lens apparatus according to claim 1, further comprising a control unit that turns on energization of the electromagnet when moved from the first slide position or the second slide position.   8. The detection device according to claim 7, further comprising a detection unit configured to detect movement of the first ring member from the first slide position or the second slide position by an induced electromotive force generated in a circuit of the electromagnet. The lens device described.   9. The lens apparatus according to claim 7, wherein the operation feeling adjusting means further includes means for changing a rising characteristic of energization to the electromagnet when the electromagnet is turned on.

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