JP2005221959A - Optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of a ghost and a flare by preventing a luminous flux passing through an optical equipment from being made incident on an actuator. <P>SOLUTION: The optical equipment is provided with an optical unit having the actuator (49), a control unit for controlling the actuator, and a flexible board (46) for transmitting an electric signal between the control unit (22) and the actuator, and the actuator is provided with a luminous flux side part facing the luminous flux passing through the optical unit, and the flexible board is arranged so as to cover the luminous flux side part, and also, antireflection processing is applied on the luminous flux side surface of the flexible board. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens barrel having elements using coils, yokes, and magnets, such as a shake correction device and an electromagnetic diaphragm, and an optical apparatus using the same, and particularly to an image ghost obtained by the lens barrel and the optical apparatus. This is to prevent problems such as flare and flare.

  Current cameras often automate all tasks important for shooting, such as determining exposure and focusing, and there is very little possibility of mistakes in shooting operations even for those who are not yet familiar with camera operations. Recently, a system (anti-vibration system) for preventing camera shake applied to the camera has been commercialized, and there are almost no factors that cause a photographer to make a shooting mistake. Here, a system for preventing camera shake will be briefly described.

  The camera shake at the time of shooting is normally a vibration of 1 Hz to 12 Hz as a frequency. When releasing the shutter button, the basic idea for making it possible to take a picture with no image blur even if such camera shake occurs is to detect the camera vibration due to the above-mentioned camera shake, and depending on the detected value Displace the correction lens.

  Therefore, in order to take a photograph that does not cause image shake even if camera shake occurs, first, the camera vibration is accurately detected, and secondly, the optical axis change due to camera shake is corrected. In principle, this vibration (camera shake) is detected by integrating a vibration detection unit that detects angular acceleration, angular velocity, angular displacement, etc., and an output signal from this vibration detection unit electrically or mechanically. The camera shake detection unit that outputs the displacement is mounted on the camera.

  Then, based on this detection information, the lens holding frame holding the correction lens is driven in a plane orthogonal to the optical axis to prevent image blur.

  Various optical devices such as a camera having such an image blur correction function have been proposed, and examples thereof are disclosed in Patent Documents 1 and 2 below.

  In Patent Document 1, a light-shielding member is disposed on the object side of the correction optical system for shake correction in order to prevent image deterioration due to light leakage, ghost, and flare in the vicinity of the shake correction unit. Moreover, in patent document 2, it is set as the structure which integrally formed the light shielding member in the latching means. As a result, harmful light incident through the space formed when the lens holding frame holding the correction lens is driven in the plane orthogonal to the optical axis is mixed in the photographic light beam, for example, in a camera. Is preventing.

Further, in an optical device such as a lens barrel, a light amount adjusting device as disclosed in Patent Document 3 is used.
Japanese Patent No. 3044930 (paragraph numbers 0039 and 0040) JP-A-9-61879 (paragraph numbers 0085 and 0086) Japanese Patent Laid-Open No. 10-20359 (FIG. 1, etc.)

  In the lens barrel of Patent Document 2, as shown in FIG. 8, the light shielding portion of the locking means 719 is extended in the optical axis direction, but the side surface on the light flux side of the coil 720 that is the drive source of the locking means 719. Since the locking means 719 cannot be disposed on the 720a due to its configuration, the color of the coil wire is exposed to the light beam side. For this reason, when a light beam entering the lens barrel hits the exposed portion, a ghost is generated. In order to suppress the occurrence of ghosts, there is a method of applying an antireflection coating to the coil. However, there is a limit to the coating material that can be applied, and a more advanced coating operation is required, which takes time.

  Further, when the locking means 719 is configured so as to cover the inner peripheral surface 720a of the drive coil 720, the drive coil 720 must be arranged greatly shifted to the outer diameter side. In this case, the lens barrel itself becomes larger in the radial direction, which is against the demand for downsizing.

  Further, in the diaphragm unit disclosed in Patent Document 3, the drive unit of the diaphragm unit has a shape protruding in the optical axis direction. Therefore, the inner peripheral surface of the drive unit on the light beam side is in a state where the yoke is exposed to the light beam side, and depending on the arrangement of the optical system, ghosts and flares may be caused by harmful light incident on the inner peripheral surface of the drive unit. is there. Therefore, apply anti-reflection paint to the beam side of the yoke, shift the drive part to the outer diameter side (increase the outer diameter), and place another part between the light beam and the drive part. Although there is a method for preventing the occurrence of ghosts and the like, it is disadvantageous in terms of work man-hours as in the case of the above-described shake correction device, and has become a factor that hinders downsizing.

  In view of the above problems, the present invention prevents ghosts and flares caused by the incidence of a light beam on the light beam side (inner peripheral side) surface of an actuator composed of a coil, a yoke, etc. The purpose is to reduce the size of the optical device while saving the time and effort.

  In order to solve the above-described problems, an optical apparatus according to the present invention includes an optical unit having an actuator, a control unit that controls the actuator, and a flexible substrate that transmits an electrical signal between the control unit and the actuator. Has a light beam side portion facing a light beam passing through the optical unit, the flexible substrate is disposed so as to cover the light beam side portion, and the light flux side surface of the flexible substrate is subjected to an antireflection treatment. It is characterized by that.

  According to the present invention, the light beam side portion facing the light beam of the actuator is covered with the flexible substrate, and the light beam side surface of the flexible substrate is subjected to antireflection treatment, so that the light beam passing through the optical device is By preventing the light from entering the actuator, it is possible to prevent the occurrence of ghost and flare.

  In addition, since the flexible substrate that transmits an electrical signal to the actuator of the optical device is subjected to an antireflection treatment and generation of ghosts and flares can be prevented without adding new parts, the optical device can be miniaturized.

  When the actuator is, for example, a coil, the surface has an uneven shape, so that advanced work is required to perform the antireflection treatment, but in the present invention, the flexible substrate is subjected to the antireflection treatment. The cost can be reduced.

Examples of the present invention will be described below.

  First, an outline of a camera as an optical apparatus of the present embodiment will be described with reference to FIG. Here, FIG. 1 is a front perspective view of the camera.

  Reference numeral 100 denotes a camera body, and a mount 9 (described later) is provided on the front surface of the camera body 100, and a lens barrel 200 that can be zoomed is detachably mounted on the mount 9. A detailed description of the lens barrel 200 will be described later.

  A dial-type shooting mode dial 300 for determining a shooting mode is provided on the right side of the camera main body 100, and a strobe light emitting device 400 is provided on the left side of the shooting mode dial 300. A release button 500 is provided on the left side of the light emitting device 400.

  The strobe light emitting device 400 can be opened and closed with respect to the camera body 100, and is driven in the opening direction to irradiate the subject with strobe light when photographing.

  The release button 500 is a two-stage operation switch. The shooting preparation operation (focus detection operation, photometry operation, etc.) is started by the first stroke operation, and the shooting operation (CCD, not shown) is started by the second stroke operation. Exposure to an image sensor such as a CMOS sensor and recording of an image signal output from the image sensor onto a recording medium are started. The description of the other camera body 100 is omitted.

  Next, the structure of the lens barrel 200 will be described with reference to FIG. FIG. 2 is a cross-sectional view including the optical axis direction of the lens barrel 200. In the drawing, the configuration above the center line represents the configuration at the wide-angle end (wide end), and the configuration below the center line represents the configuration at the telephoto end (tele end).

  In the lens barrel 200, L <b> 1 to L <b> 6 each represent a lens unit, and the focal length can be changed according to the advancement / retraction of the zoom operation ring 1. An operation rubber 1a is arranged on the outer periphery of the zoom operation ring 1 so that it can be easily operated, a claw 1b for attaching a hood (not shown) is arranged at the front end, and a focus operation ring 2 and a rear end. A zoom operation adjustment ring 3 is arranged. By rotating the zoom operation adjustment ring 3, the frictional force with the fixed cylinder 4 inside the zoom adjustment ring 3 changes, and the operation load of the zoom operation ring 1 can be adjusted.

  Reference numeral 5 denotes a rectilinear cylinder which moves forward and backward in the optical axis direction together with the zoom operation ring 1 and the first lens barrel 13 holding the lens unit L1. Since the rectilinear barrel 5 is provided with a cam 5a, and the cam follower of the cam 5a is fixed to the cam ring 6, it moves toward the subject while rotating around the optical axis as the first barrel 13 advances and retreats. .

  The amount of movement of the cam ring 6 in the optical axis direction is the same as the amount of movement of the fifth lens barrel (shake correction unit) 12 in the optical axis direction, and the fifth lens barrel 12 is fixed to the moving tube 11. The cam follower fixed to the movable cylinder 11 slides in a circumferential groove (not shown) provided in the cam ring 6 so that the driving force in the optical axis direction of the cam ring 6 is transmitted.

  Reference numeral 7 denotes a guide cylinder configured in a two-stage shape, and a focus unit 8 is fixed at a position indicated by a shaded portion of the step on the image plane side, and a fixed cylinder 4 and a mount 9 are provided at the end on the image plane side. Is fixed by screws. A waterproof rubber 10 prevents water from entering the mount 9 when it is attached to the camera.

  A cam follower fixed to the focus cam ring 15 is engaged with a guide groove provided in the cam ring 6 extending in the optical axis direction and a cam 11a provided in the movable cylinder 11. The focus cam ring 15 By moving to the subject side while rotating around the axis, the second lens holding unit 14 advances and retreats without rotating around the optical axis.

  The second lens barrel 14 holds the focus lens unit L2, and the driving force corresponding to the output from the focus unit 8 (autofocus) and the rotation operation of the focus operation ring 2 (manual focus) is the focus key 16. It is driven by being transmitted through.

  In the lens barrel 200 of the present embodiment, the amount of movement of the second barrel 14 in the optical axis direction is changed by changing the use area of the focus cam by the rotation of the focus cam ring 15.

  A diaphragm unit 17 is fixed to the third lens barrel 18 holding the lens unit L3. In the third lens barrel 18, a cam follower (not shown) integral with the third lens barrel 18 slides in a cam groove 6 a provided in the cam ring 6 and a straight advance groove (not shown) provided in the movable cylinder 11. Thus, it advances and retreats in the optical axis direction.

  Similarly, the fourth lens barrel 19 holding the lens unit L4 is integrated with the fourth lens barrel 19 in a cam groove 6b provided in the cam ring 6 and a straight groove not shown provided in the movable cylinder 11. The cam follower (not shown) slides forward and backward in the optical axis direction.

  Similarly, the sixth lens barrel 20 holding the lens unit L6 is also integrated with the sixth lens barrel 20 in a cam groove portion 6c provided in the cam ring 6 and a straight groove portion (not shown) provided in the guide tube 7. The cam follower (not shown) slides forward and backward in the optical axis direction.

  Reference numeral 21 denotes a tripod seat, which is provided with a screw portion 21a for fixing to a support member such as a tripod.

  Reference numeral 22 denotes a control circuit that controls the entire lens barrel 200 and is fixed to the guide tube 7 in a state where a plurality of plane portions are formed so as to surround the optical axis as a center. Further, the control circuit 22 is electrically connected to the focus unit 8 and the camera body 100 via the contact point 22 and further to the shake correction unit 12 via the shift FPC 40 shown in FIG. It is connected to the diaphragm unit 17 via the FPC 62 shown.

  The vibration gyro as a shake detector that determines the drive target of the shake correction unit 12 is soldered to the control circuit 22 and is fixed to the guide cylinder 7 via rubber.

  Next, the configuration of the shake correction unit 12 will be described with reference to FIG. Here, FIG. 3 is an exploded perspective view of the shake correction unit.

  In the drawing, the base member 30 is formed in a cylindrical shape, and roller seats 30a (two not shown) are provided on the outer peripheral surface at three locations in the circumferential direction, and these roller seats 30a are not. The illustrated barrel roller is screwed.

  The base member 30 is fixed to the movable cylinder 11 by these lens barrel rollers engaging with attachment holes (not shown) provided in the movable cylinder 11.

  The first yoke 32 as a magnetic body is fixed by screwing three screws 34 penetrating through the three holes 32 a formed in the first yoke 32 into the holes 30 b of the ground plate 30. A permanent magnet 33a (shift magnet) such as a neodymium magnet is attracted to the first yoke 32 by a magnetic force. L5 is a fifth lens unit that is driven in the plane orthogonal to the optical axis and prevents image shake, and is held by the support frame 31.

  The bobbin unit 35 is fixed to the object side (left side in the figure) of the support frame 31 by three non-magnetic screws 36 and the image side (right side in the figure) is projected on the surface such as IRED. An optical element (not shown) is bonded. The light beam from the light projecting element is incident on a position detecting element 40b such as a PSD described later through the slit 31a. Thereby, the position of the support frame 31 can be detected.

  Further, shift coils 35p and 35y are bonded and fixed to the bobbin unit 35, and the ends of these coil wires are wound around the bobbin pin 35a and soldered.

  On the outer peripheral surface of the support frame 31, holes 31b are formed at three locations in the circumferential direction (two are not shown), and support pins 37 are engaged with these holes 31b. These support pins 37 pass through the three cam groove portions 30 c formed in the base plate 30 and extend in the circumferential direction, and protrude outward in the radial direction of the base plate 30.

  Thereby, the support frame 31 is positioned in the optical axis direction with respect to the base plate 30 and can be moved smoothly in the plane orthogonal to the optical axis.

  Reference numeral 38 denotes an L-shaped shaft made of a nonmagnetic stainless material. One end is supported by the support frame 31 and the other end is supported by a bearing portion 30 d formed on the ground plate 30. Since the L-shaped shaft 38 serves as a stopper, the support frame 31 can be prevented from rotating around the optical axis.

  Note that the L-shaped shaft 38, the bearing portion 30d formed on the base plate 30, and the backlash of the support frame bearing portion are set large in the optical axis direction, and light from the support pin 37, the cam groove portion 30c of the base plate 30, and the hole portion 31b. This prevents the axial limit and overlapping fitting.

  A plurality of protrusions are formed on the object-side surface of the second yoke 39, and a position detection element 40b, an output amplification IC (not shown), a connection connector 40c, and the like are mounted on the tips of these protrusions. The shift substrate 40 is in contact. The shift substrate 40 is formed with three positioning holes 40a. The positioning projections 30d of the base plate 30 are engaged with the positioning holes 40a, and the three screws 41 are screwed into the first position. 2 Screwed to the yoke 39. As described above, the shift substrate 40 is electrically connected to the control circuit 22.

  The plurality of protrusions formed on the second yoke 39 are designed so as not to contact the wiring pattern formed on the shift substrate 40 except for one protrusion, and the pattern breaks due to the contact. It is preventing. One protrusion that does not contact the wiring pattern is in contact with the ground pattern of the shift substrate 40, whereby the second yoke 39 can be grounded (grounded), thereby preventing elements in the shift substrate 40 from being damaged by static electricity. Can do.

  A permanent magnet 33b having the same shape as the permanent magnet 33a is magnetically attracted and fixed to the image side surface of the second yoke 39.

  According to the above-described configuration, a closed magnetic path is formed by the first yoke 32, the permanent magnet 33a, the permanent magnet 33b, and the second yoke 39, and the inside of the magnetic circuit is energized to the coil 35p of the bobbin unit 35, etc. 31 is driven. Also. Since the first yoke 32 and the second yoke 39 are attracted to each other at the portion where the magnets are opposed by this magnetic circuit, even if the second yoke 39 to which the shift substrate 40 is attached is fixed to the base plate 30 with only the screws 42. The second yoke 39 does not cause a positional shift.

  Reference numeral 43 denotes a shift FPC. A first mounting portion 43a disposed at both ends of the shift FPC 43 and a second mounting portion 43b disposed on the optical axis side of the first mounting portion 43a are respectively provided on the bobbin unit 35. This is soldered to two IREDs (not shown) bonded to the support frame 31 so as to face the bobbin pins 35a and the position detection element 40b mounted on the shift substrate 40.

  43c is a connection part electrically connected to the connector mounted on the shift board 40, and a bent part is formed between the connection part 43c and the second attachment part 43b. When the support frame 31 is shifted, the bent portion is elastically deformed accordingly, so that the shift FPC 43 can be prevented from being stretched.

  Accordingly, the IRED and the coils 35p and 35y are driven from the shift substrate 40 via the shift FPC 43.

Next, the arrangement of the components constituting the shake correction unit 12 will be described with reference to FIGS.
Here, FIG. 4 is a structural diagram when the shake correction unit 12 is viewed from the image plane side. For ease of explanation, FIG. 4 is a diagram with the lock yoke 47 and the lock magnet 48b in FIG. 3 removed. Show.

  First, a through hole 30f is formed in the ground plate 30, from which the back surface of the first yoke 32 is exposed. A lock magnet 48a is incorporated into the through hole 30f from the back side, and is magnetically coupled to the first yoke 32.

  In the lock ring 45, lock cam portions 45 a that are recessed radially outward are formed on the inner peripheral side at four locations in the circumferential direction, and lock ring recesses 45 d that are recessed radially inward are formed on the outer peripheral side at four locations in the circumferential direction. Is formed. The support frame 31 is formed with a protrusion 31c at the same phase as the lock cam portion 45a.

  Therefore, when the lock ring 45 rotates around the optical axis, the rotation phase of the protrusion 31c is shifted from the lock cam 45a (that is, the protrusion 31c and the inner peripheral portion 45f of the lock ring are in contact with each other). ) Is a state in which the support frame 31 is locked (locked state), and when the rotation phases of the lock cam portion 45a and the projection portion 31c coincide with each other, the support frame 31 is free to be perpendicular to the optical axis. Can move inside (unlocked state).

  Further, a lock coil 49 is bonded to the flat portion 45c of the lock ring 45, and the tip end of the coil wire is soldered to a tip end portion 46b of a lock FPC (flexible printed circuit board) 46 attached to the outer periphery of the lock ring 45. Has been. A hole 46a for inserting the connection pin 50a of the suction coil 50 is formed at the base end of the lock FPC 46, and the connection pin 50a is soldered to the hole 46a. The lock FPC 46 is formed with a wiring pattern for transmitting an electric signal output from the control circuit 22 to the lock coil 49.

  Further, the connection portion 46 e of the lock FPC 46 is electrically connected to the connector 40 c of the shift board 40. The lock FPC 46 is provided with a U-turn portion 46 d that changes from a bent state to an extended state in accordance with the rotation operation around the optical axis of the lock ring 45.

  Therefore, since the lock FPC 46 does not stretch against the rotation of the lock ring 45, the lock ring 45 can be rotated around the optical axis with a small load.

  The suction yoke 51 enters the central axis of the suction coil 50, the armature 56, which is a magnetic body held by the lock ring 45, contacts the suction yoke 51, and the lock ring 45 is held by the suction force of the suction coil 50. In this state, the support frame 31 can move freely in the plane perpendicular to the optical axis. The adsorption coil 50 is fixed by screwing the adsorption yoke 51 to the base plate 30 with screws 52.

  The armature 56 is held by inserting the armature shaft 57 into the hole 45e provided in the lock ring 45 with the rubber 59 inserted, and then inserting the armature spring 58 into the armature shaft 57. The armature shaft 57 is held by tightening. At this time, the armature shaft 57 is held in a tangential direction with respect to the optical axis at the phase of the armature 56. Further, the armature spring 58 is biased in a direction in which the lock ring 45 and the armature 56 are stretched.

  Next, the incorporation of the lock ring 45 will be described. First, the lock ring recess 45 d of the lock ring 45 is in phase with the four inner diameter protrusions 30 h formed on the base plate 30, and the lock ring 45 is pushed into the base plate 30. One of the inner diameter protrusions 30h is not shown.

  Next, the lock ring 45 is rotated in the unlocking direction (clockwise direction in FIG. 4) and engaged with the main plate 30. As a result, the lock ring 45 can rotate around the optical axis in a state where relative movement in the optical axis direction with respect to the ground plane 30 is prevented.

  Then, by rotating the lock ring 45, the lock ring recess 45d and the projection 30h are again in the same phase, and the lock rubber 54 is attached to the ground plate 30 in order to prevent the lock ring 45 from being detached from the ground plate 30. The drive range of the lock ring 45 is limited by being fixed to the hole 30i.

  Convex-shaped portions are formed on the periphery of the lock rubber 54 so as to surround substantially half of the outer periphery thereof, and the tilt direction of the lock rubber 54 is determined by these convex-shaped portions. Further, when the lock yoke 47 is fixed to the base plate 30 with two screws 53, the lock yoke 47 is sandwiched by a dimensional relationship that is slightly charged to prevent the lock yoke 47 from coming off.

  In the lock yoke 47, a lock magnet 48b is arranged so as to face the lock magnet 48a in the optical axis direction, and a closed magnetic path is formed by these, and the lock coil 49 in the magnetic path is energized. The lock ring 45 is rotationally driven.

  Hooks 45 b and 30 g are formed on the lock ring 45 and the base plate 30, respectively, and these hooks 45 b and 30 g are connected by a spring 55.

  The lock ring 45 is always urged counterclockwise in FIG. 4 due to the non-energizing force of the spring 55, but the stopper 45 f of the lock ring 45 comes into contact with the lock rubber 54, so that the lock ring 45 comes off from the main plate 30. There is no.

  Further, in order to make the shake correction unit 12 and the lens barrel 200 themselves compact, it is necessary to reduce the difference between the inner and outer diameters of the main plate 30 constituting the shake correction unit 12. Therefore, in this embodiment, the wall of the lock ring 45 is not provided between the optical axis side surface of the lock coil 49 and the optical axis.

  Therefore, depending on the arrangement of the lens unit (the telephoto side in this embodiment), the winding of the lock coil 49 is exposed to the light beam passing through the lens barrel 200, and harmful light is incident on this exposed portion. Doing so may cause ghosts and flares.

  Therefore, in this embodiment, the lock FPC 46 is wound around the lock coil 49 (a portion substantially parallel to the optical axis) to prevent the coil wire of the lock coil 46 from being exposed to the light beam side, and the lock FPC 46 The surface 46c on the light beam side (the shaded area in FIG. 4) is coated with an antireflection coating to prevent ghosts and flares.

  In addition, the resin that is the material of the lock ring 45 can be made thinner by covering it with the FPC rather than forming a wall between the lock coil 49 and the light beam, so that the lens barrel can be downsized in the radial direction. it can.

  In addition, when the antireflection paint is directly applied to the coil wire of the lock coil 46, the surface of the coil wire is uneven, so that a high degree of painting work is required in order to prevent the paint piece dust from dropping. In the present embodiment, such a trouble is eliminated, and a portion covering the lock coil 46 is provided between the soldering portion 46b and the shift board connecting portion 46e, so that the cost is not increased and the occurrence of ghost and flare is prevented. be able to.

  The shake correction unit incorporated in the lens barrel of the present invention will be described with reference to FIG. In addition, the same component as Example 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  Here, FIG. 5 is a view of the shake correction unit of this embodiment as viewed from the object side. The lock ring 45 is rotatable around the optical axis in a state where relative movement in the optical axis direction with respect to the base plate 30 is prevented. Lock magnets 48a and 48b shown in FIG. 3 are arranged on the lock yoke 47 so as to face each other. The lock ring 145 is driven by energizing the lock coil 49 located in the closed magnetic path formed by these.

  The lock ring 145 has three recesses 145a in the circumferential direction for avoiding interference with other lens barrels when the lock ring 145 is incorporated into the lens barrel. Since the portion corresponding to the shaded portion A of the suction yoke 50 and the suction coil 51 is exposed to the light beam side from the concave portion 145a, the light beam incident on the lens barrel at the time of shooting is reflected by the exposed portion, and ghost, flare May occur.

  Therefore, in the present embodiment, the region facing the light beam of the adsorption coil 50 and the adsorption yoke 51, that is, the above-described region A is covered with the FPC 146 for energizing the adsorption coil 50, and the antireflection paint is applied to the covered portion. Is applied. Thereby, it is possible to prevent problems such as ghost and flare from occurring.

  In addition, since the power supply soldering portion 146a and the shift substrate 40 are covered with each other, the problem can be solved without significant cost increase and advanced work.

  Next, the case where the present invention is applied to the aperture unit 17 (see FIG. 2) will be described with reference to FIGS. FIG. 6 is a perspective view of the aperture unit, and FIG. 7 is an exploded view of a stepping motor that drives the aperture unit 17. First, the configuration of the stepping motor will be described with reference to FIG.

  Reference numerals 191 and 192 denote stator yokes in which a plurality of (six) sheets of the same shape of soft magnetic material are stacked and fixed. The stator yoke 192 is used with the stator yoke 191 turned upside down.

  Reference numeral 193 denotes a plastic magnet rotor which can be rotated by excitation of the stator yokes 191 and 192. The outer periphery of the rotor is magnetized in a divided and alternate manner, and is anisotropically oriented. A gear 193 a is attached to the tip of the output shaft 193 b of the rotor 193 and rotates together with the rotor 193. The gear 193a is connected to the aperture spring 63 via a transmission mechanism (not shown), and is configured such that the aperture spring 63 opens and closes according to the rotation operation of the rotor 193.

  Reference numerals 194 and 195 denote coils for exciting the stator yoke 191 and the stator yoke 192, respectively. The coils 194 and 195 are composed of the same parts. The coils 194 and 195 are configured to excite the stator yokes 191 and 192 when energized from the connection terminals 194a, 194b, 195a and 195b, respectively.

  The stator yokes 191 and 192 are positioned and supported by a shaft portion 197e provided on the base plate 197. Further, the rotation shaft 193b of the rotor 193 is rotatably supported by the main plate 197. Reference numeral 196 denotes a motor case lid, which rotatably supports the rotating shaft 193c of the rotor 193, and is unitized as a stepping motor 19 by hooking the claw portions 196a to 196e into groove portions (not shown) of the base plate 197. .

  Next, the operation of the stepping motor 19 will be described. When the coils 194 and 195 are energized through the connection terminals 194a, 194b, 195a and 195b, a magnetic field is generated in the stator yokes 191 and 192 and interacts with the magnetic field of the magnet rotor 193 to form a closed magnetic circuit. At this time, if the coil 195 is not energized, the magnetic path generated by the energized coil 194 becomes dominant, and rotational torque is generated in the magnet rotor 193 (the same applies when only the coil 195 is energized).

  Similarly, when both the coils 194 and 195 are energized, magnetic paths are formed in the stator yokes 191 and 192, respectively, and interact with the magnet roller 193 to give a rotational torque to the magnet rotor 193.

  Therefore, the stepping motor 19 can be driven by energizing both coils 194 and 195 while sequentially switching the current direction. As a result, the driving force of the gear portion 193a that rotates together with the magnet rotor 193 is transmitted to the diaphragm blade 63 via a transmission mechanism (not shown), and the opening area of the light passage opening formed by the diaphragm blade 63 changes.

  Next, the attachment position of the FPC 62 with respect to the stepping motor 19 will be described with reference to FIG. Here, FIG. 6 is a perspective view of the stepping motor 19 to which the FPC 62 is attached.

  As shown in FIG. 6, the FPC 62 is attached so as to cover a portion of the stepping motor 19 in a direction orthogonal to the motor case lid 196, and an antireflection paint is applied to the region 62 b of the FPC 62 facing the light beam. Is applied. Thereby, since the antireflection paint is arranged between the light flux side portions of the stator yokes 191 and 192 and the light flux, the cause of internal reflection such as ghost and flare can be eliminated. Further, since it is not necessary to provide a wall between the stator yokes 191 and 192 and the light beam, it is not necessary to perform advanced work.

  The present invention can also be applied to a coil used for focus drive and a coil of a shift drive system of a shake correction unit. The present invention can also be applied to an actuator having components other than a coil, a magnet, and a yoke, for example, a vibration type motor (a configuration in which a piezoelectric element is driven with a frequency signal to rotate a rotor). In the configuration using the vibration type motor described above, the ring type vibration type motor has a configuration in which a flexible substrate with antireflection treatment applied to the light beam side is disposed on the inner periphery (light beam side) of the annular portion. In addition, in a configuration using a cylindrical vibration type motor, a configuration may be adopted in which a flexible substrate that has been subjected to antireflection treatment on the light beam side is disposed along a portion of the cylindrical portion facing the light beam. it can.

  In addition, as an antireflection treatment applied to the light flux side surface of the flexible substrate, an antireflection coating is applied, but as another method, a configuration in which a sheet-like member having flocking such as flocking paper is attached to the flexible substrate, or a flexible substrate It is good also as a structure which performed the flocking process.

The front view of the camera which is an example of the optical instrument of this invention Cross section of lens barrel 1 is an exploded perspective view of the shake correction unit of FIG. View of shake correction unit viewed from the optical axis direction The figure which looked at the shake correction unit of Example 2 from the optical axis direction The perspective view of the aperture unit of Example 3 Exploded view of the stepping motor that is the drive source of the aperture unit View of conventional shake correction unit viewed from the optical axis direction

Explanation of symbols

12: shake correction unit 17: aperture unit 30: base plate 31: support frame 45: lock ring 46: lock FPC
49: Lock coil

Claims (6)

An optical unit having an actuator;
A control unit for controlling the actuator;
A flexible substrate for transmitting an electrical signal between the control unit and the actuator;
The actuator has a light beam side portion facing a light beam passing through the optical unit;
An optical apparatus, wherein the flexible substrate is disposed so as to cover the light beam side portion, and an antireflection treatment is applied to a surface of the flexible substrate on the light beam side.   The wiring pattern for transmitting the electrical signal is formed in a region on the light flux side of the flexible substrate on a region where the antireflection treatment is performed or a region on the back side of the region. The optical apparatus according to 1. The actuator includes a coil, a magnet, and a yoke,
3. The optical apparatus according to claim 1, wherein the flexible substrate is disposed so as to cover at least one of the coil, the magnet, and the yoke. The optical unit is a light amount adjusting unit that moves a light blocking member to change a passing amount of the light beam,
The optical apparatus according to claim 1, wherein the actuator drives the light shielding member.   4. The optical apparatus according to claim 1, wherein the optical unit is a shake correction unit that suppresses shake of an image formed by the light flux by moving an optical element. 5.   The optical apparatus according to claim 5, wherein the shake correction unit includes a lock mechanism that holds the optical element in a predetermined position, and the actuator drives the lock mechanism.

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