JP4750452B2 - Optical equipment - Google Patents

Description

  The present invention relates to an optical apparatus such as an imaging apparatus or a replaceable lens apparatus.

  2. Description of the Related Art Conventionally, an imaging device and a replaceable lens device are provided with an actuator of a type that drives using a magnetic action as a drive source for a focus lens (movable member), for example. The actuator includes a yoke extending in the moving direction of the movable member, a coil wound around the yoke, and a magnet disposed so as to face the coil.

Here, the magnet is fixed to the yoke by adhesion. In addition, there is one in which a magnet is brought into contact with a yoke using a sheet metal material (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-23037 (paragraph numbers 0019 to 0025, FIGS. 4 and 5)

  However, when the yoke and the magnet are fixed by adhesion, they must be supported until the yoke and the magnet are fixed, and the assembly work becomes complicated.

  Moreover, in the configuration using a separate member such as a sheet metal material as in Patent Document 1, there is a problem that the number of parts increases, so that the number of assembling steps increases and the assembling work becomes complicated or the cost increases. .

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an optical apparatus that can reduce the number of parts and the number of assembly steps.

The optical apparatus according to the present invention includes a fixed member, a movable member movable in the optical axis direction with respect to the fixed member, a yoke, a magnet, and a coil. An electromagnetic drive unit for driving, the coil being wound around an axis parallel to the moving direction of the movable member, the magnet being attracted to the yoke, and the magnet being a light The fixing member is provided with one first positioning projection that penetrates the positioning hole of the yoke, and the first positioning projection is The magnet has a first step portion that can be brought into contact with a surface of the magnet that faces the contact surface with the yoke, and that is in contact with one end of the magnet. 1's A second positioning projection that engages with the two notches of the yoke is provided at a position spaced apart from the positioning projection in the optical axis direction, and the second positioning projection is provided on the yoke of the magnet. A second step portion and a third step portion that are capable of abutting on a surface opposite to the abutting surface of the magnet and abutting on the other end of the magnet and spaced apart in a direction perpendicular to the optical axis. Each of the first step portion, the second step portion, and the third step portion includes a first contact surface that restricts a position of the magnet in the optical axis direction and light of the magnet. A second abutting surface for limiting the position in the direction perpendicular to the axis is provided.

  According to the present invention, by forming the support portion on the fixing member, it is possible to support the yoke with a simple configuration or to prevent the magnet from falling off the yoke.

  Examples of the present invention will be described below.

  A camera that is Embodiment 1 of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view of the camera of this embodiment. In FIG. 1, L is a lens barrel capable of zooming, and B is a camera body.

  2 is an exploded perspective view showing the configuration of the lens barrel L shown in FIG. 1, and FIG. 3 is a cross-sectional view of the lens barrel L. As shown in FIG.

  In the lens barrel L, four lens units L1 to L3b, which are convex, concave, convex, and convex, are arranged in this order from the object side (left side in FIG. 3), and the variable magnification optical system (zoom lens) is arranged by these lens units. ) Is configured.

  2 and 3, L1 is a first lens unit, L2 is a second lens unit that performs a zooming operation by moving in the optical axis direction, L3a is a first afocal lens unit, and L3b is a second afocal lens. Is a unit. L4 is a fourth lens unit that performs focus adjustment by moving in the optical axis direction. These lens units L1 to L4 constitute a photographing optical system.

  Reference numeral 1 denotes a front lens barrel that holds the first lens unit L1. Reference numeral 5 denotes a fixed barrel, one end on the object side is fixed to the front lens barrel 1, and the other end on the image plane side is fixed to a second afocal base (second fixing member) 3b described later. Thereby, the first lens unit L1 is fixed at a predetermined position.

  Reference numeral 2 denotes a variator moving frame that holds the second lens unit L2. 3a is a first afocal base that holds the first afocal lens unit L3a, and 3b is a second afocal base that holds the second afocal lens unit L3b.

  The first afocal lens unit L3a is fixed to the first afocal base 3a in advance by adhesion or heat caulking. Similarly, the second afocal lens unit L3b is fixed to the second afocal base 3b in advance by adhesion or heat caulking.

  The first afocal base 3a and the second afocal base 3b are relatively aligned and fixed with an adhesive. As this adhesive, for example, an ultraviolet curable adhesive is used.

  Reference numeral 4 denotes a focus movement frame (movable member) that holds the fourth lens unit L4, and reference numeral 6 denotes a rear barrel (first fixing member) whose one end is fixed to the second afocal base 3b.

  Reference numeral 601 denotes an image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor, which photoelectrically converts an optical image (subject image) formed by the photographing optical system. Reference numeral 602 denotes an intermediate member for attaching the image sensor 601 to the rear barrel 6. That is, the imaging element 601 is fixed to the intermediate member 602 with an adhesive or the like, and the intermediate member 602 is fixed to the rear barrel 6 with screws or the like. Reference numeral 603 denotes an optical filter disposed on the object side with respect to the image sensor 601 and functions as a low-pass filter, an infrared cut filter, an ultraviolet cut filter, and the like.

  Reference numeral 8 denotes a first guide bar whose both ends are supported by the fixed barrel 5 and the rear barrel 6. The second guide bar 9 is supported at both ends by the fixed barrel 5 and the second afocal base 3b. The fourth guide bar 11 is supported at both ends by the second afocal base L3b and the rear barrel 6. Also, the third guide bar (not shown) is supported at both ends by the second afocal base 3 b and the rear barrel 6, similarly to the fourth guide bar 11.

  The variator moving frame 2 is supported by the first and second guide bars 8 and 9 so as to be movable in the optical axis direction, and the focus moving frame 4 is supported by the third and fourth guide bars 11 so as to be movable in the optical axis direction. Has been.

  The second afocal base 3 b is positioned with respect to the rear barrel 6 and then fixed to the rear barrel 6. The second afocal base 3 b is also fixed to the fixed barrel 5 and is disposed between the rear barrel 6 and the fixed barrel 5.

  Reference numeral 7 denotes a light amount adjustment unit that adjusts the amount of light incident on the image plane, and includes two diaphragm blades 702 and 703. The amount of light can be adjusted by moving the diaphragm blades 702 and 703 in a plane substantially orthogonal to the optical axis to change the diameter of the opening through which the imaging light flux passes. The diaphragm blades 702 and 703 operate by receiving a driving force from the diaphragm motor 704.

  The light quantity adjustment unit 7 includes an ND (Neutral Density) filter 706 having a plurality of different densities (optical densities). The ND filter 706 can move back and forth in the imaging optical path, and operates independently of the aperture blades 702 and 703 in response to the driving force from the ND motor 705.

  The light amount adjustment unit 7 is disposed between the first afocal lens L3a and the second afocal lens L3b, and is fixed to the second afocal base 3b with screws 707.

  Reference numerals 401 and 402 respectively denote a coil and a drive magnet that constitute a focus motor (voice coil motor as an electromagnetic drive unit) that drives the fourth lens unit L4 in the optical axis direction. Reference numerals 403 and 405 denote first and second yokes for closing the magnetic flux.

  Here, when a current is passed through the coil 401, a Lorentz force is generated between the drive magnet 402 and the coil 401 due to repulsion between the magnetic lines of force, and the focus moving frame 4 moves in the optical axis direction together with the coil 401.

  The focus moving frame 4 holds a sensor magnet (not shown) magnetized with multiple poles in the optical axis direction. An MR sensor 404 that reads a change in magnetic field lines accompanying the movement of the sensor magnet (focus movement frame 4) is fixed to the position of the rear barrel 6 facing the sensor magnet with screws.

  A detection signal corresponding to the movement of the focus movement frame 4 is output from the MR sensor 404. Based on this detection signal, the amount of movement of the focus movement frame 4 (fourth lens unit L4) from the reference position can be detected. it can.

  A zoom motor (stepping motor) 201 drives the second lens unit L2 in the optical axis direction. A lead screw 202 is formed on the output shaft of the zoom motor 201. The zoom motor 201 is fixed to the fixed barrel 5 via a support member 210 with screws.

  A rack 203 attached to the variator moving frame 2 is engaged with the lead screw 202. For this reason, when the lead screw 202 rotates by energization of the zoom motor 201, the variator moving frame 2 (second lens unit L2) moves in the optical axis direction by the engagement action of the lead screw 202 and the rack 203.

  The torsion coil spring 204 is provided to suppress backlash between the rack 203, the variator moving frame 2, the first and second guide bars 8, 9 and the lead screw 202.

  Reference numeral 205 denotes a zoom reset switch for detecting the reference position of the variator moving frame 2, which includes a photo interrupter having a light projecting unit and a light receiving unit. The light shielding unit 206 formed on the variator moving frame 2 can be moved back and forth between the light projecting unit and the light receiving unit in accordance with the movement of the variator moving frame 2.

  The zoom reset switch 205 is switched between a light projection state in which light from the light projecting unit reaches the light receiving unit and a light shielding state in which light traveling from the light projecting unit to the light receiving unit is blocked by the light shielding unit 206. The output signal changes. Based on this change, the reference position can be detected. The zoom reset switch 205 is fixed to the fixed barrel 5 with a screw 207 through a substrate.

  After detecting that the second lens unit L2 is at the reference position, the amount of movement of the second lens unit L2 in the optical axis direction is continuously counted by counting the number of pulse signals input to the zoom motor 201 as a stepping motor. (Position relative to the reference position) can be detected.

  Next, the structure for supporting the first yoke 403, the second yoke 405, and the drive magnet 402 will be described in detail with reference to FIGS. FIG. 4 is a cross-sectional view of a part of a lens barrel including a focus motor. 5 and 6 are exploded perspective views showing the peripheral structure of the focus motor, respectively, as seen from different directions. FIG. 7 is a front view of the peripheral structure of the focus motor as viewed from the object side.

  First, a structure for supporting the first yoke 403 will be described.

  The first yoke 403 has a positioning hole 406, and a positioning pin (supporting part) 604 formed in the rear barrel 6 is inserted into the positioning hole 406. Accordingly, the first yoke 403 can be positioned in a plane that is substantially orthogonal to the optical axis (hereinafter referred to as an optical axis orthogonal plane).

  Here, since there is a slight gap (backlash) between the positioning hole 406 and the positioning pin 604 and the first yoke 403 extends in the optical axis direction, the longitudinal direction of the positioning pin 604 (optical axis direction). In contrast, the first yoke 403 is inclined.

  The first yoke 403 has two arm portions 403a and 403b extending in the optical axis direction, and two convex portions 412 are formed on one arm portion 403a as shown in FIGS. . These convex portions 412 are press-fitted into a concave portion 606 formed in the rear barrel 6. Thereby, the inclination of the first yoke 403 can be prevented.

  Here, the magnetization direction of the drive magnet 402 in the plane orthogonal to the optical axis is the X direction, and the direction perpendicular to the X direction is the Y direction. The dimension Y1 in the Y direction of the arm portion 403a including the convex portion 412 is substantially equal to the distance in the Y direction between the two concave portions 606. Further, the dimension X1 of the convex portion 412 in the X direction is substantially equal to the dimension of each concave portion 606 in the X direction.

  When the convex portion 412 is press-fitted into the concave portion 606, a part of the first yoke 403, that is, the surface on which the positioning hole portion 406 is formed abuts against the end surface 607 of the rear barrel 6, thereby Can be positioned in the optical axis direction.

  Next, a structure for supporting the drive magnet 402 will be described.

The drive magnet 402 is attracted to one of the two arm portions 403a and 403b of the first yoke 403. As a result, the drive magnet 402 is positioned in the X direction.

The position of the drive magnet 402 in the Y direction, as shown in FIG. 7, a Y-direction dimension Y2 drive magnet 402, the dimension in the Y direction of the portion drive magnet 402 is housed within the rear barrel 6 Y3 And determined by the relationship. The dimension Y3 is about 0.1 to 0.2 mm longer than the dimension Y2. In other words, the drive magnet 402 is arranged in a state with a predetermined gap with respect to the rear barrel 6 in the Y direction.

  For this reason, when the first yoke 403 to which the drive magnet 402 is attracted is incorporated in the rear barrel 6, the first yoke 403 can be easily assembled without being hindered by the drive magnet 402. .

  Here, with the above-described configuration, the drive magnet 402 can be displaced in the Y direction with respect to the rear barrel 6, which may affect the driving force of the focus motor. However, if the dimension Y2 of the drive magnet 402 is set to a value as large as possible with respect to the dimension Y3 of the rear lens barrel 6, problems such as insufficient driving force of the focus motor will not occur.

  On the other hand, as shown in FIG. 4, one end of the drive magnet 402 can come into contact with a stepped portion 605 formed at the tip of the positioning pin 604 of the rear barrel 6. Further, the other end of the drive magnet 402 can come into contact with a stepped portion 3b2 formed at the tip of the convex portion (supporting portion) 3b1 of the second afocal base 3b.

The stepped portions 605 and 3b2 have optical axis orthogonal surfaces, and the end portions of the drive magnet 402 abut on these surfaces (first abutting surface : indicated by A in FIGS. 4 and 6 ) . The position of the magnet 402 in the optical axis direction (Z direction) is limited.

  The distance Z1 in the optical axis direction between the first contact surfaces of the stepped portions 605 and 3b2 is longer by about 0.1 to 0.2 mm than the dimension Z2 of the drive magnet 402 in the optical axis direction. That is, the distance Z1 is such a value that the drive magnet 402 does not spread the rear barrel 6 and the second afocal base 3b in the optical axis direction even when the dimensions of the members constituting the lens barrel vary. Is set to

  With the above-described configuration, the drive magnet 402 can be displaced in the optical axis direction. Here, since the dimension Z2 of the drive magnet 402 is set to a sufficiently large value with respect to the length of the movable region of the coil 401, the displacement of the drive magnet 402 does not affect the driving force of the focus motor. .

The step portions 605 and 3b2 also have a surface (second contact surface : indicated by B in FIGS. 4 and 6 ) substantially parallel to the optical axis, and the drive magnet is formed by these surfaces and the surface of the first yoke 403. Both ends of 402 are sandwiched. For this reason, when the lens barrel receives an impact from the outside, both ends of the drive magnet 402 come into contact with the second contact surfaces of the step portions 605 and 3b2 even if the drive magnet 402 is separated from the first yoke 403. Become.

  When there is no external impact, the drive magnet 402 is attracted to the first yoke 403 again. That is, the distance between each second contact surface in the step portions 605 and 3b2 and the first yoke 403 is a value that allows the attraction force of the drive magnet 402 to the first yoke 403 to be maintained.

  As described above, the second contact surfaces of the stepped portions 605 and 3b2 can prevent the drive magnet 402 from remaining detached from the first yoke 403.

  In addition, since the coil 401 is located on the optical axis side with respect to the position where the drive magnet 402 abuts on the second abutting surface of the step portions 605 and 3b2, the drive magnet 402 detached from the first yoke 403 is coiled. No collision with 401. Therefore, the coil 401 is not damaged.

  Next, a structure for supporting the second yoke 405 will be described.

  The second yoke 405 is attached to the first yoke 403. Specifically, the protrusions 413 formed at the tips of the arm portions 403 a and 403 b in the first yoke 403 are fitted with the two first cutout portions 408 formed in the second yoke 405. Here, the distance X2 in the X direction between the two protrusions 413 is substantially equal to the distance X3 in the X direction between the two first cutouts 408. Further, the dimension Y4 of each protrusion 413 in the Y direction is substantially equal to the dimension Y5 of each first notch 408 in the Y direction.

  With the above-described configuration, the second yoke 405 can be positioned within the optical axis orthogonal plane. Further, the second yoke 405 contacts the first yoke 403 by receiving the attractive force of the drive magnet 402. Thereby, the second yoke 405 can be positioned in the optical axis direction.

  On the other hand, as shown in FIG. 6, two second cutout portions 407 are formed in the second yoke 405. The 2nd notch part 407 engages with the convex part 3b1 of the 2nd afocal base 3b. Thereby, the 2nd yoke 405 can be positioned within an optical axis orthogonal plane. Here, the convex portion 3b1 is engaged with the second cutout portion 407 at a portion other than the step portion 3b2, and the step portion 3b2 can come into contact with the end portion of the drive magnet 402 as described above.

  Next, the electrical configuration of the camera of this embodiment will be described with reference to FIG. In FIG. 8, the same members as those described in FIGS. 1 to 7 are denoted by the same reference numerals.

  Reference numeral 34 denotes a focus motor which is a drive source of the fourth lens unit 4 and is driven in response to a control signal from a CPU 37 which will be described later. Specifically, the CPU 37 controls energization to the coil 401 constituting the focus motor 34.

  An aperture encoder 36 detects the positions of the aperture blades 702 and 703 and outputs the detection result to the CPU 37. As the diaphragm encoder 36, there is a diaphragm encoder in which a Hall element is disposed in the diaphragm motor 704 and a rotational positional relationship between the rotor and the stator is detected.

  Reference numeral 37 denotes a CPU that controls the operation of the entire camera. A camera signal processing circuit 38 generates a video signal (image data) by performing signal processing such as predetermined amplification and gamma correction on the output of the image sensor 601. The contrast signal in the video signal generated by the camera signal processing circuit 38 is supplied to the AE gate 39 and the AF gate 40.

  Each of the AE gate 39 and the AF gate 40 sets an optimum signal extraction range for exposure control and focus adjustment from the video signals of the entire screen. The size of the gate may be variable, or a plurality of gates may be provided.

  Reference numeral 41 denotes an AF signal processing circuit that processes an AF signal used for AF (autofocus), and generates one or a plurality of signals related to high-frequency components in the video signal generated by the camera signal processing circuit 38.

  Reference numeral 42 denotes a zoom switch for instructing zooming of the photographing optical system, and the CPU 37 drives the zoom motor 201 based on a signal from the zoom switch 42.

  Reference numeral 43 denotes a zoom tracking memory which stores position information of the fourth lens unit L4 corresponding to the subject distance and the position (zoom position) of the second lens unit L2 during zooming operation. That is, the information in the zoom tracking memory 43 is used to move the fourth lens unit L4 and correct the displacement of the image plane due to the zooming operation. Note that the memory in the CPU 37 may be used as the zoom tracking memory.

  For example, when the zoom switch 42 is operated by the photographer, the CPU 37 moves in a state in which the second lens unit L2 and the fourth lens unit L4 maintain a predetermined positional relationship based on information in the zoom tracking memory 43. In this way, the driving of the zoom motor 201 and the focus motor 34 is controlled.

  That is, the zoom motor 201 and the focus motor 34 are set so that the current position (count value) and the target position of the second lens unit L2 match and the current position (count value) and the target position of the fourth lens unit L4 match. Control the drive. Here, the target position indicates position information in the zoom tracking memory 43.

  In the autofocus operation, the CPU 37 controls the drive of the focus motor 34, that is, the energization amount of the coil 401 based on the output of the AF signal processing circuit 41 and the output of the MR sensor 404. Then, when the output of the AF signal processing circuit 41 shows a peak, the driving of the focus motor 34 is stopped. As a result, the photographing optical system is brought into focus.

  Further, the CPU 37 controls the driving of the aperture motor 704 so that the output of the aperture encoder 36 becomes the reference value with the average value of the output of the Y signal passing through the AE gate 39 as the reference value. Thereby, the amount of light incident on the image plane can be adjusted, and appropriate exposure can be obtained.

  Next, a camera that is Embodiment 2 of the present invention will be described. The description of the same configuration as the camera of the first embodiment is omitted, and a different configuration will be described with reference to FIGS. 9 and 10. FIG. 9 is a front view of the first yoke and the rear barrel viewed from the object side, and FIG. 10 is an external perspective view of the first yoke and the rear barrel. Here, the same reference numerals are used for members having the same functions as those described in the first embodiment.

  First, a structure for supporting the first yoke 403 will be described.

The first yoke 403 has a notch 418 used for positioning the first yoke 403 . The rear barrel 6 is formed with a protrusion 608 that fits into the notch 418. By fitting the notch 418 of the first yoke 403 with the protrusion 608 of the rear barrel 6, the first yoke 403 can be positioned in the plane orthogonal to the optical axis.

  Here, the dimension X10 of each protrusion 608 in the X direction is substantially equal to the dimension of each notch 418 in the X direction. Further, the distance Y10 between the protrusions 608 in the Y direction is substantially equal to the distance between the notches 418 in the Y direction.

  The first yoke 403 has two arm portions 403a and 403b extending in the optical axis direction (Z direction). On the tip side (object side) of one arm portion 403a, 2 is provided as in the first embodiment. Two convex portions 412 are formed. These convex portions 412 are press-fitted into a concave portion 606 formed in the rear barrel 6. By supporting the first yoke 403 with the protrusion 608 and the recess 606 in this manner, the first yoke 403 can be prevented from falling.

  When the convex portion 412 is press-fitted into the concave portion 606, the first yoke 403 can be positioned in the optical axis direction by abutting the first yoke 403 against the end surface 607 of the rear barrel 6.

  Next, a structure for supporting the drive magnet 402 will be described.

As shown in FIG. 10, a step 609 is formed on the protrusion 608 of the rear barrel 6. The step portion 609 has a first contact surface (indicated by C in FIG. 10) that is a surface substantially orthogonal to the optical axis, and a second contact surface (indicated by D in FIG. 10) that extends in the optical axis direction . And have. Similarly to the first embodiment, a step 3b2 is formed on the convex portion 3b1 of the second afocal base 3b. The step portion 3b2 also has a first contact surface that is a surface substantially orthogonal to the optical axis and a second contact surface that is a surface extending in the optical axis direction.

  The first contact surfaces of the step portions 609 and 3b2 can be in contact with both ends of the drive magnet 402, and limit the displacement of the drive magnet 402 in the optical axis direction.

  The distance in the optical axis direction (corresponding to Z1 in FIG. 4) between the first contact surfaces of the step portions 609 and 3b2 is 0 than the dimension in the optical axis direction of the drive magnet 402 (corresponding to Z2 in FIG. 4). .1 to 0.2 mm longer. That is, the distance between the first contact surfaces causes the drive magnet 402 to spread the rear barrel 6 and the second afocal base 3b in the optical axis direction even if the dimensions of the members constituting the lens barrel vary. It is set to a value that never happens.

  Since the distance in the optical axis direction between the first contact surfaces is longer than that of the drive magnet 402, the drive magnet 402 can be displaced in the optical axis direction by this difference. Here, the dimension of the drive magnet 402 in the optical axis direction is set to be sufficiently longer than the size of the movable region of the coil 401 in the optical axis direction. For this reason, even if the drive magnet 402 is displaced in the optical axis direction, the driving force of the focus motor is not affected.

  On the other hand, the second contact surfaces of the step portions 609 and 3b2 can contact both ends of the drive magnet 402, and limit the displacement of the drive magnet 402 in the X direction. That is, both ends of the drive magnet 402 are sandwiched between one arm portion 403a of the first yoke 403 and the second contact surfaces of the step portions 609 and 3b2, and limit the displacement of the drive magnet 402 in the X direction. .

  Even if an external force is applied to the lens barrel L so as to disengage the drive magnet 402 from the first yoke 403 in the X direction, both ends of the drive magnet 402 are in contact with the second contact surfaces of the step portions 609 and 3b2. Abut. Thereby, it is possible to prevent the drive magnet 402 from being detached from the first yoke 403.

  Further, the coil 401 is disposed on the optical axis side from the position where the drive magnet 402 abuts on the second abutting surfaces of the step portions 609 and 3b2. Therefore, it is possible to prevent the drive magnet 402 from being detached from the first yoke 403 and damaging the coil 401.

  As described above, in the first and second embodiments, the drive magnet 402 is formed by the stepped portion 605 (609) formed in the rear barrel 6 and the stepped portion 3b2 formed in the second afocal base 3b. This prevents the yoke 403 from being detached. In the configuration of the above-described embodiment, the first yoke 403 and the like need only be incorporated into the rear barrel 6 and the second afocal base 3b, and it is necessary to fix the drive magnet 402 and the first yoke 403 using an adhesive or the like. Absent.

  Thereby, the lens barrel L can be easily assembled. In addition, in this embodiment, the step portions 605, 609 and 3b2 formed integrally with the rear barrel 6 and the second afocal base 3b are used, and no separate member is used as in Patent Document 1. The number of parts can be reduced, and the number of assembly steps can be reduced.

  In the above-described embodiment, as shown in FIG. 4, the first yoke 403 having a substantially U-shaped cross section in the optical axis direction and the flat second yoke 405 are used. The shape is not limited to the shape described above.

  In other words, any shape may be used as long as the two yokes are used to have a surface facing each other in the optical axis direction and a surface facing each other in the optical axis orthogonal direction. For example, the above-described configuration can be obtained by combining two yokes having a substantially L-shaped cross-section in the optical axis direction.

  Then, these yokes may be supported by the positioning pins 604 (protrusions 608) and the convex portions 3b1 as in the first and second embodiments.

  On the other hand, in the above-described embodiment, the camera (optical apparatus) in which the lens barrel L is integrally provided in the camera body B has been described. However, the present invention is a lens apparatus (optical apparatus) that is detachable from the camera body. ) And optical equipment such as binoculars. Further, the present invention can be applied not only to a camera provided with an image sensor but also to a camera using a silver salt film.

1 is an external perspective view of a camera that is Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of a lens barrel in Embodiment 1. FIG. 1 is a cross-sectional view of a lens barrel of Embodiment 1. FIG. FIG. 3 is a cross-sectional view of a portion including a focus motor in the lens barrel of Embodiment 1; FIG. 3 is an exploded perspective view of a portion including a focus motor in the lens barrel of the first embodiment. FIG. 3 is an exploded perspective view of a portion including a focus motor in the lens barrel of the first embodiment. The front view when the focus motor in Example 1 is seen from the object side. 1 is a diagram illustrating a circuit configuration of a camera that is Embodiment 1. FIG. The front view when the focus motor in the lens barrel of Embodiment 2 of the present invention is viewed from the object side. FIG. 6 is an exploded perspective view of a portion including a focus motor in the lens barrel of Embodiment 2.

Explanation of symbols

L: Lens barrel B: Camera body L4: Fourth lens unit 3b: Second afocal base 4: Focus movement frame 6: Rear barrel 401: Coil 402: Drive magnet 403: First yoke 405: Second yoke 605 3b2: Stepped portion

Claims (6)

A fixing member;
A movable member movable in the optical axis direction with respect to the fixed member;
An electromagnetic drive unit having a yoke, a magnet, and a coil, and driving the movable member together with the coil by energizing the coil;
The coil is wound around an axis parallel to the moving direction of the movable member,
The magnet is attracted to the yoke,
The magnet is displaceable in the optical axis direction and the optical axis orthogonal direction,
The fixing member includes one first positioning protrusion that passes through the positioning hole of the yoke.
The first positioning protrusion has a first step portion that can be brought into contact with a surface of the magnet facing the contact surface with the yoke and is in contact with one end of the magnet. ,
The fixing member includes a second positioning protrusion that engages with the two notches of the yoke at a position spaced apart from the first positioning protrusion in the optical axis direction.
The second positioning projection can be in contact with a surface of the magnet facing the contact surface with the yoke, can be in contact with the other end of the magnet, and is separated in the direction perpendicular to the optical axis. A second step portion and a third step portion,
Each of the first step portion, the second step portion, and the third step portion includes a first contact surface that limits a position of the magnet in the optical axis direction and a position of the magnet in the direction perpendicular to the optical axis. An optical apparatus comprising a second contact surface for limiting   The optical apparatus according to claim 1, wherein the first contact surface is capable of contacting an end surface of the magnet in a moving direction of the movable member. The coil is disposed on a side opposite to the magnet side with respect to the second contact surface of the first step portion, the second step portion, and the third step portion. The optical apparatus according to claim 1. Before SL yoke includes a first yoke and a second yoke having each a mutually opposed surfaces in the direction of movement of said movable member,
The first yoke has the positioning hole, and the second yoke has the two notches;
The fixing member includes a first fixing member having the first positioning protrusion, and a second fixing member having the second positioning protrusion,
Wherein the first yoke is supported by the first positioning protrusion and the second yoke according to any one of claims 1 to 3, characterized in that it is supported by the second positioning projection Optical equipment. Said first yoke extends in the moving direction of said movable member includes an arm portion engaging said first stationary member at the distal end side,
Said second yoke, and characterized by having an engaging portion for engaging said two notches, and the first yaw click engaging said second positioning protrusion of the second fixing member The optical apparatus according to claim 4 .   The optical apparatus according to claim 1, wherein the movable member includes a lens unit that constitutes a part of a photographing optical system.

Images