JP2005292202A - Optical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical apparatus capable of detecting positional information on an optical element without increasing the number of components and without upsizing the apparatus, and capable of making the most of merits of an electrostatic actuator which is small in size, but, which has a satisfactory driving force. <P>SOLUTION: Regarding the optical apparatus having the electrostatic actuator for moving the optical element held by a needle in an optical axis direction, the apparatus is provided with a detection electrode for detecting a contact with an initial position detecting part arranged in the needle when the needle holding the optical element moves to a prescribed position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical device. More specifically, the present invention relates to an optical device that moves an optical system by an electrostatic actuator.

  In recent years, an imaging device that captures a subject image with a solid-state imaging device has been mounted on a small and thin portable terminal such as a mobile phone or a PDA (Personal Digital Assistant), thereby not only providing audio information to a remote place. Image information can also be transmitted to each other. These imaging devices are desired to be extremely small and thin so that they can be built in a portable terminal.

  On the other hand, these imaging devices are aiming for higher functionality as the penetration rate improves, and not only pan-focus shooting using a deep depth of field by fixing the imaging optical system but also moving the imaging optical system. There is a demand for mounting close-up photography (macro photography) and variable focal length optical system (zoom optical system).

  In response to these demands for miniaturization and higher functionality, various optical devices using electrostatic actuators have been proposed as actuators capable of directly moving optical systems individually (for example, Patent Document 1). Patent Document 2).

  An optical device described in Patent Literature 1 and Patent Literature 2 includes a pair of stators having stator electrodes arranged on opposite surfaces, and a mover that is disposed between the stators and holds an optical element. The electrostatic force is generated by applying a voltage to the stator electrode in a predetermined pattern, and the optical element provided on the mover is moved. Accordingly, since the optical element can be moved with a sufficient driving force even in a small size, an optical device having a high-performance adjustment function can be obtained.

On the other hand, the drive control of the optical system by a general actuator such as a stepping motor controls the position of the lens while obtaining the position information of the lens that is an optical element. The lens position is generally detected using a photo interrupter, a magnetic encoder, or the like (for example, Patent Document 3 and Patent Document 4).
Japanese Patent Laid-Open No. 10-239578 JP 2001-346385 A JP 2003-295034 A JP 2003-90706 A

  However, in the optical device of Patent Document 1 or Patent Document 2, when a photo interrupter or a magnetic encoder is used for detecting the lens position, a light shielding unit for detecting the lens position, a magnetic body, and a signal processing circuit for detecting them are provided. It is necessary to newly install, which leads to an increase in the number of parts and the size of the device, and offsets the advantage of the optical device using the electrostatic actuator that the optical element is moved with a sufficient driving force even if it is small. There is.

  Therefore, the present invention can detect the position information of the optical element without increasing the number of parts or increasing the size of the apparatus, and can maximize the advantages of the electrostatic actuator having a sufficient driving force even with a small size. An object of the present invention is to provide an optical device that can be used.

  The object of the present invention can be achieved by the following constitution.

The invention of claim 1 includes a pair of stators having stator electrodes arranged on opposite surfaces, and
A movable element disposed between the stators and holding an optical element;
In the optical device in which the movable element moves in the optical axis direction of the optical element in response to the potential switching of the stator electrode,
An initial position detector provided in the mover;
An optical apparatus comprising: a detection electrode that detects contact with the initial position detection unit when the movable element moves to a predetermined position.

  According to a second aspect of the present invention, there is provided control means for controlling the amount of movement of the mover by switching the potential of the stator electrode, with the position at which the detection electrode detects contact with the initial position detector as the initial position. The optical device according to claim 1.

Invention of Claim 3 has a fixing means which fixes the said needle | mover,
3. The optical device according to claim 1, wherein the fixing unit fixes the movable element so that the detection electrode and the initial position detection unit are in contact with or close to each other.

  The invention according to claim 4 is the optical device according to any one of claims 1 to 3, wherein the detection electrode is arranged on a surface on which the stator electrodes are arranged.

The invention of claim 5 is an imaging device provided on the optical axis and at an imaging position of the optical element,
A substrate on which the image sensor is disposed;
The optical device according to claim 1, wherein the detection electrode is disposed on a substrate on which the imaging element is disposed.

  According to the first aspect of the present invention, there is provided a detection electrode that detects contact with an initial position detection unit provided on the movable element when the movable element holding the optical element moves to a predetermined position. The exact position of the optical element can be detected without increasing the number of points and the size of the apparatus, and the driving accuracy of the optical element can be increased.

  That is, since the mover of the electrostatic actuator is maintained at a predetermined voltage, the mover is provided with an initial position detection unit, and a detection electrode that detects energization with the initial position detection unit when the mover moves to a predetermined position. By providing this, the contact between the initial position detection unit and the detection electrode can be detected by energization of the initial position detection unit and the detection electrode.

  If the detection electrode is provided in a predetermined position in advance, when the mover reaches the predetermined position, the initial position detection unit and the detection electrode come into contact with each other and current flows through the detection electrode, so that the position of the mover can be detected. Become. Therefore, it is possible to detect the position of the mover without providing a member such as a light shielding part or a magnetic body for position detection on the mover. By performing drive control of the electrostatic actuator using the predetermined position thus detected as the initial position of the mover, high-precision drive control is possible.

  According to the second aspect of the present invention, the potential of the stator electrode is set with the position where the detection electrode detects the energization with the initial position detection unit, that is, the position where the movable element has reached the predetermined position as the initial position. Since the movement amount of the mover is controlled by switching, the movement control of the mover may be performed by performing a potential change set in advance in association with the movement amount of the mover with respect to the stator electrode. The drive accuracy can be increased without increasing the size of the apparatus.

  According to the third aspect of the present invention, the fixing means fixes the movable element so that the detection electrode and the initial position detection unit are in contact with or close to each other, so that, for example, when the optical device is not operating, that is, the stator electrode When no voltage is applied to the detection electrode, the detection electrode and the initial position detection unit can be brought into contact with or close to each other at the fixed position. In order to shift an optical device equipped with an electrostatic actuator from a non-operating state to an operating state, an initial operation such as moving the mover to an initial position is required. Are fixed in contact with each other or in close proximity to each other, the movement of the mover to the initial position can be completed in a very short time. Therefore, the time required for the optical device to transition from the non-operating state to the operating state can be extremely short.

  According to the invention of claim 4, since the detection electrode is arranged on the surface on which the stator electrode is arranged, it becomes possible to form the detection electrode and the stator electrode in the same electrode manufacturing process, The number of steps in the manufacturing process can be reduced, the detection electrode can be attached with high accuracy, and the optical element can be driven with high accuracy.

  According to the fifth aspect of the present invention, since the detection electrode is arranged on the substrate on which the image sensor is arranged, the number of parts can be reduced, and the mounting accuracy of the detection electrode with respect to the image sensor and The drive accuracy of the movable element with respect to the image sensor can be increased, and the drive accuracy of the optical element can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a schematic configuration of an optical apparatus according to the present invention. In the figure, 1 represents the optical axis of the optical device.

  The optical device includes an imaging device 2, stators 3 a and 3 b, wall surfaces 4 a and 4 b, a mover 5, and a mounting substrate 6. These are held in a housing (not shown).

  The imaging device 2 is a solid-state imaging device such as a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor. The image sensor 2 is mounted on an extension line of the optical axis 1 on the mounting substrate 6.

  The stators 3a and 3b are arranged to face the Y direction (vertical direction) in the figure with the optical axis 1 in between. Each of the stators 3a and 3b has a drive electrode and a holding electrode, which will be described later, as stator electrodes.

  The wall surfaces 4a and 4b hold the stators 3a and 3b as a part of the housing of the optical device, and are disposed so as to face the X direction (horizontal direction) in the figure with the optical axis 1 interposed therebetween. That is, the stators 3a and 3b and the wall surfaces 4a and 4b are arranged in a square tube shape so as to surround the optical axis 1. Furthermore, the mover 5 is disposed inside a quadrangular cylinder formed by the stators 3a and 3b and the wall surfaces 4a and 4b.

  The mover 5 is formed in a square cylinder shape, and a mover electrode portion 5a is formed on a surface facing the stator 3a, and a mover electrode (not shown) is formed on a surface facing the holding electrode 33 of the stator 3b. A portion is formed and is configured to be driven in a direction parallel to the optical axis 1 by a pair of stators 3a and 3b. A lens group 5c, which is an optical element, is assembled at the center.

  The mover 5 is made of a conductive material such as a metal or a conductive resin. For example, the vapor grown carbon fiber (VGCS) and polyphenylene sulfide (PPS) described in JP-A-2003-284359 are used. It is desirable that it be formed of a conductive resin molded from a resin composition that is melt-kneaded with the thermoplastic resin, because it is lightweight and inexpensive.

  A conductive initial position detector 5e is formed on the surface of the mover 5 facing the stator 3a. The initial position detection unit 5e is formed as a convex portion similarly to the mover electrode unit 5a.

  1 will be described with reference to FIG. FIG. 2 is a perspective view of the mover 5. This figure is a perspective view of the mover 5 from a direction different from that in FIG. In the following drawings, the same symbols are assigned to the same elements as those described above in order to avoid duplication of explanation.

  A mover electrode portion 5a formed on the surface of the mover 5 facing the stator 3a in FIG. 1 is formed as a convex portion at a predetermined pitch at a twisted position in a direction perpendicular to the optical axis 1. FIG. The mover electrode portion 5b formed on the surface facing the stator 3b is formed as a convex portion (two locations in the figure) in a direction parallel to the optical axis 1. Further, four protrusions 5d are formed on one side of the surface of the mover 5 facing the wall surfaces 4a and 4b. The protrusion 5d of the mover 5 can slide smoothly with the wall surfaces 4a and 4b and supports the mover 5. Note that the mover electrode unit 5a, the initial position detection unit 5e, and the above-described mover electrode unit 5b shown in FIG. 1 are connected to a switching circuit, which will be described later, so that the voltage is maintained constant or the charge is removed. .

  Stator 3a, 3b of FIG. 1 is demonstrated using FIG. FIG. 3A is a schematic diagram showing an electrode pattern formed on the stator 3a, and FIG. 3B is a schematic diagram showing an electrode pattern formed on the stator 3b.

  A detection electrode 34 and drive electrodes 31a, 31b, 31c, and 31d, which are stator electrodes, are formed on the surface of the stator 3a facing the mover electrode portion 5a in FIG.

  The four drive electrodes 31a, 31b, 31c, and 31d are formed in a state of being arranged in a stripe pattern in order, and are connected to a switching circuit described later via wiring pads 32a, 32b, 32c, and 32d, respectively. Yes. The relationship between the arrangement pitch of the stripe-shaped drive electrodes 31a, 31b, 31c, and 31d and the pitch of the convex portions formed on the mover electrode portion 5a is that the width of the convex portion of the mover electrode portion 5a is L. Assuming that the arrangement pitch is 2L (see FIG. 2), the arrangement pitch of the drive electrodes 31a, 31b, 31c, and 31d is arranged to be approximately L / 2. L can be set as appropriate according to the driving accuracy of the mover 5 and the gap between the stators 3a, 3b and the mover 5, but is preferably 10 μm to 100 μm.

  The drive electrodes 31a, 31b, 31c, and 31d move the mover 5 by being sequentially switched by a switching circuit described later and applied with a voltage.

  The detection electrode 34 is formed adjacent to the arrangement of the drive electrodes 31a, 31b, 31c, 31d, and the two detection electrodes 34a, 34b arranged on the stator 3a with a predetermined interval are respectively connected to the wiring pads. It is connected to a control unit described later via 32f and 32g. When the initial position detection unit 5e contacts the detection electrode 34, the two detection electrodes 34a and 34b are short-circuited and energized, thereby transmitting to the control unit that the movable element 5 is in the initial position as an electrical signal. ing.

  In addition to detecting contact with the initial position detection unit 5e due to a short circuit between the two detection electrodes 34a and 34b, the detection electrode 34 applies a voltage to the initial position detection unit 5e to detect the initial position. The detection electrode 34 a may be energized by the contact between the part 5 e and the detection electrode 34.

  A holding electrode 33 which is a stator electrode is formed on a surface of the stator 3b facing the mover electrode portion 5b in FIG. The one-system holding electrode 33 is formed at a position corresponding to the mover electrode portion 5b in FIG. 2, and is connected to a switching circuit described later via a wiring pad 32e.

  Stator 3a, 3b is created by forming the conductor film of the said electrode pattern on the board | substrate consisting of insulators, such as glass or ceramics, by methods, such as photolithography. Moreover, it is preferable to provide an insulator film on the formed conductor film except for the detection electrode 34.

  The arrangement and functional configuration of each part of the optical device according to the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing a cross section and a schematic configuration of the optical device according to the present invention, in which the stators 3 a and 3 b and the movable element 5 are cut along the optical axis 1.

  The optical device includes a control unit 101, a storage unit 102, and a switching circuit 103 in addition to the imaging device 2, the stators 3 a and 3 b, the mover 5, and the mounting substrate 6 described with reference to FIGS.

  The control unit 101 includes a CPU (central processing unit) (not shown), a work memory, and the like, reads a program stored in the storage unit 102 into the work memory, and centrally controls each unit of the optical device according to the program.

  The storage unit 102 includes a nonvolatile semiconductor memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory), and stores various programs and settings that can be executed by the control unit 101. In the storage unit 102, the number of steps associated with a reference position (for example, the infinity position of the lens 5c) moved by a predetermined distance from the initial position of the mover 5 is written for each optical device adjusted at the time of factory shipment. Yes.

  The switching circuit 103 is controlled by the control unit 101 and applies the voltage generated by the voltage source 104 to the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33 while sequentially switching them at the timing, and the movable electrode unit This is a circuit for keeping the voltages 5a and 5b constant or removing charges.

  The switching circuit 103 has a plurality of fixed contacts (not shown) connected to the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33, a movable contact (not shown) connected or grounded to the voltage source 104, and the like. When any one of the contacts is connected to the voltage source 104 via the movable contact, the other fixed contact is connected to the ground or the voltage source 104 and maintained at a negative potential. Further, the mover electrode portions 5a and 5b and the initial position detection portion 5e are connected to the ground or the voltage source 104 and maintained at a negative potential.

The voltage source 104 is a battery, a current conversion circuit, or the like, and applies a predetermined voltage to each part of the optical device. With respect to the initial position detection unit 5e and the detection electrode 34, as shown in FIG. When moved, the upper surface of the initial position detector 5e and the detection electrode 34 come into contact with each other. However, the initial position detector 5e and the detection electrode 34 have shapes that do not hinder the movement of the stator 5. Specifically, the height of the upper surface of the detection electrode 34 is substantially the same as or slightly higher than that of the drive electrodes 31a to 31d, and the surface thereof is flat. About the same or slightly higher, and its surface is flat. By doing in this way, even if the initial position detection part 5e and the detection electrode 34 contact | abut, since the stator 5 moves, an excessive driving force is not required, and a vibration and noise do not generate | occur | produce.

  In the case where the mover 5 is formed of a conductive material, the initial position detection unit 5e may be configured such that the surface in contact with the detection electrode 34 has conductivity. In this case, the initial position detector 5e can be formed together with the molding of the mover 5, which is preferable in the manufacturing process.

  Returning to FIG. 4, the driving principle of the optical device according to the present embodiment will be described. FIG. 4 schematically shows the drive electrode and the mover electrode portion in an enlarged manner for the sake of explanation, but in actuality, the drive electrodes are arranged at intervals of about 10 μm to 100 μm at several tens to thousands. Established.

  In the state of FIG. 4, when the voltage application to the holding electrode 33 is stopped and the voltage is applied to the drive electrodes 31a and 31b, it is movable by the electrostatic force acting between the drive electrodes 31a and 31b and the mover electrode portion 5a. The child electrode portion 5a is attracted to the drive electrodes 31a and 31b of the stator 3a. At this time, since the state in which the drive electrodes 31a and 31b and the mover electrode part 5a overlap is most stable, the mover 5 is formed on the stator 3a so that the drive electrodes 31a and 31b and the mover electrode part 5a overlap. The drive electrode moves to the right side of the paper by one pitch.

  Subsequently, the voltage application to the drive electrodes 31 a and 31 b is stopped, and the voltage is applied to the holding electrode 33. The mover 5 is attracted to the stator 3b side. As a result, the movable element 5 is moved from the state shown in FIG. 4 to the right side of the drawing sheet in the optical axis direction by one pitch of the drive electrodes formed on the stator 4a.

  Further, when the voltage application to the holding electrode 33 is stopped and the voltage is applied to the drive electrodes 31b and 31c, the movable element 5 is driven by the same mechanism as when the voltage is applied to the drive electrodes 31a and 31b. And the mover electrode portion 5a are moved to the right side of the paper by one pitch of the drive electrodes formed on the stator 3a so that they overlap each other. Such a series of operations, that is, the electrodes to which the voltage is applied, are the driving electrodes 31a and 31b → the holding electrode 33 → the driving electrodes 31b and 31c → the holding electrode 33 → the driving electrodes 31c and 31d → the holding electrode 33 → the driving electrodes 31d and 31a. .. Are sequentially and repeatedly applied (voltages are alternately applied to the drive electrodes 31a, 31b, 31c, 31d provided on the stator 3a and the holding electrode 33 provided on the stator 3b, and the electrodes provided on the stator 3a) Are sequentially switched in a predetermined direction), the movable element 5 is microscopically moved in the vertical direction while being macroscopically moved in the arrangement direction (right side of the drawing) of the electrodes arranged on the stator 3a.

  When the order of applying voltages to the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33 is reversed, the mover 5 moves macroscopically in a direction opposite to the above-described direction (left side of the drawing).

  As described above, the moving distance of the mover 5 is determined by the number of times of voltage application switching. Therefore, the control unit 101 controls the switching timing and the number of times of voltage application by the switching circuit 103 by outputting forward and backward commands and the number of moving steps. That is, when the movement distance of the movable element 5 is determined by a focus detection unit or an operation unit (not shown), the control unit 101 moves based on the number of steps of the reference position written in the storage unit 102. The number of steps is calculated, and the forward and backward commands and the calculated number of movement steps are output to the switching circuit 103. The switching circuit 103 performs voltage application switching at the timing and the number of times according to the forward and backward commands output from the control unit 101 and the number of movement steps.

  An initial position adjusting operation in the optical apparatus of the present invention will be described with reference to FIG. FIG. 6 is a flowchart showing an initial position adjustment operation performed after the main power supply of the optical apparatus is turned on.

  In step S101, it is determined whether or not the mover 5 is at a predetermined position, that is, whether or not the detection electrode 34 provided on the stator 3a is energized with the initial position detection unit 5e provided on the mover 5. Is done. If it is determined that the initial position detection unit 5e has been energized (step S101; YES), the process of step S102 is executed assuming that the mover 5 is at a predetermined position, and the initial position detection unit 5e is not energized. If it is determined that the mover 5 has not reached the predetermined position (NO in step S101), the process in step S103 is executed.

  In step S102, in order to set the predetermined position detected in step S101 as an initial position, the control unit 101 initializes position information held for controlling the moving distance and moving direction of the mover 5. The position information is obtained by converting the current position of the mover 5 into a numerical value. The position information is set to a predetermined value or 0 by initialization, and the process ends.

  In step S103, the voltage application to the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33 by the switching circuit 103 is switched, and the mover 5 is moved to the initial position direction of the mover 5, that is, as shown in FIG. The position detection unit 5e is driven by one pitch of the drive electrode in a direction where the position detection unit 5e and the detection electrode 34 come into contact with each other, and the process returns to step S101. Thereafter, this operation is repeated until the detection electrode 34 is energized with the initial position detection unit 5e in step S101.

  As described above, the control unit 101 sets the position where the detection electrode 34 detects contact with the initial position detection unit 5e as the initial position. The movement control of the mover 5 after the initial position adjustment process shown in FIG. 6 corresponds to the required movement distance of the mover 5 based on the number of steps of the reference position written in the storage unit 102. It is only necessary to calculate the number of movement steps to be performed and to control the switching circuit 103 so as to switch the potential corresponding to the number of movement steps. This enables highly precise lens movement control with a very simple configuration.

  Another embodiment of the optical device according to the present invention will be described with reference to FIG. FIG. 7 is a schematic diagram showing a schematic configuration of another embodiment of the optical device according to the present invention. Like FIG. 4, a cross-sectional view of the stators 3a, 3b and the movable element 5 cut along the optical axis 1. It is written together. Elements similar to those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.

  7 includes a magnet 61 and an armature 51 as fixing means.

  A magnet 61 is disposed on the mounting substrate 6 on which the imaging element 2 is disposed. The magnet 61 includes a yoke 61b having an attracting surface and a coil 61a wound around the yoke 61b. The winding is connected to the control unit 101.

  The armature 51 is disposed on the mover 5 so as to face the yoke 61b, and the armature 51 is formed with an attracting surface made of a magnetic material such as an iron plate at a position facing the attracting surface of the yoke 61b.

  The magnet 61 switches energization / non-energization of the coil 61a according to a release / adsorption command from the control unit 101, and releases / adsorbs the armature 51 by the yoke 61b. In the present embodiment, when the coil 61a is not energized, the yoke 61b adsorbs the armature 51 and releases this adsorption by energization.

  While the voltage source 104 is applying a voltage to the drive electrodes 31a, 31b, 31c, 31d or the holding electrode 33, the control unit 101 issues a release command to the magnet 61 to energize the coil 61a and turn off the main power supply. If the voltage source 104 enters a state in which no voltage is applied to any of the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33, the magnet 61 is instructed to be deenergized and the coil 61a is deenergized. . By doing in this way, even if the voltage source 104 does not apply a voltage to any of the drive electrodes 31a, 31b, 31c, 31d and the holding electrode 33, the yoke 61b attracts the armature 51, so the main power supply is turned off. For example, even when no electrostatic force is generated in any of the mover electrode portions 5a and 5b and the drive electrodes 31a, 31b, 31c and 31d and the holding electrode 33, the mover 5 moves freely so that each member The lens group 5c held by the mover 5 is not damaged or displaced.

  Further, the armature 51 has conductivity similar to the initial position detection unit 5e in FIG. 4 and is connected to the switching circuit 103 and applied with a voltage from the voltage source 104. On the other hand, like the detection electrode 34 in FIG. 4, the yoke 61 b is energized between the armature 51 and the armature 51 by contact with the armature 51, and the energization with the armature 51 is transmitted to the control unit 101 as an electric signal. Is done. That is, in the present embodiment, the armature 51 has a function as an initial position detection unit, and the yoke 61b has a function as a detection electrode, and performs an initial position adjustment process similar to that in FIG. In this case, the detection that the stator 5 has moved to the predetermined position is performed in a state where the stator 5 is fixed by the magnet 61. In the initial position adjustment shown in FIG. Is almost unnecessary, and the movement of the mover to the initial position can be completed in a very short time.

  In the present embodiment, the yoke 61b that also functions as a detection electrode is arranged on the mounting substrate 6 on which the image pickup device 2 is arranged, so that the position of the stator 4 can be detected as in the optical device of FIG. The number of parts can be reduced, and the mounting accuracy of the yoke 61b with respect to the image sensor 2 and the drive accuracy of the movable element 5 with respect to the image sensor 2 can be increased. .

  The detection of the movement of the stator 5 to a predetermined position is performed by using the initial position detection unit 5e as shown in FIG. 5 instead of using the armature 51 as an initial position detection unit and the yoke 61b as a detection electrode. The detection electrode 34 may be provided. In this case, it is not necessary for the initial position detection unit 5e and the detection electrode 34 to be in contact with each other when the magnet 61 and the armature 51 are in contact with each other, and within a few pitches from the state in which the magnet 61 and the armature 51 are in contact with each other. Therefore, the initial position detector 5e and the detection electrode 34 may be in contact with each other. That is, the magnet 61 only needs to fix the mover 5 so that the detection electrode 34 and the initial position detection unit 5e are close to each other. In this way, the detection electrode 34 and the drive electrodes 31a, 31b, 31c, 31d can be formed in the same manufacturing process, man-hours in the manufacturing process can be reduced, and the detection electrode 34 can be attached. The accuracy can be increased.

  In each of the embodiments described in the present application, the optical device having the image sensor 2 is described as an example of the optical device. However, a camera that exposes a silver halide photosensitive material such as a color film, an optical device such as a telescope or binoculars, and the like. The present invention can also be applied to a device.

  In addition, the detailed configuration and detailed operation of each component constituting the optical device can be changed as appropriate without departing from the spirit of the present invention.

It is a disassembled perspective view which shows schematic structure of the optical apparatus which concerns on this invention. It is a perspective view of a needle | mover. It is the schematic which shows the electrode pattern formed in a stator. It is a schematic diagram which shows the cross section and schematic structure which cut | disconnected the optical apparatus based on this invention along the optical axis. It is a schematic diagram which shows the state which the initial position detection part which concerns on this invention, and the detection electrode contact | abutted. It is a flowchart which shows the initial position adjustment operation performed with the optical apparatus which concerns on this invention. It is a schematic diagram which shows schematic structure of other embodiment of the optical apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical axis 2 Image pick-up element 3a, 3b Stator 31a, 31b, 31c, 31d Drive electrode 33 Holding electrode 34 Detection electrode 5 Movable element 5a, 5b Movable electrode part 5e Initial position detection part 51 Armature 61 Magnet 7 Mounting board 101 Control Unit 102 storage unit 103 switching circuit

Claims (5)

A pair of stators having stator electrodes arranged on opposite surfaces;
A movable element disposed between the stators and holding an optical element;
In the optical device in which the movable element moves in the optical axis direction of the optical element in response to the potential switching of the stator electrode,
An initial position detector provided in the mover;
An optical apparatus comprising: a detection electrode that detects contact with the initial position detection unit when the movable element moves to a predetermined position. The control means for controlling the amount of movement of the mover by switching the potential of the stator electrode, with the position at which the detection electrode detects contact with the initial position detector as an initial position. 2. The optical device according to 1. A fixing means for fixing the mover;
The optical device according to claim 1, wherein the fixing unit fixes the movable element so that the detection electrode and the initial position detection unit are in contact with each other or close to each other. The optical device according to claim 1, wherein the detection electrode is disposed on a surface on which the stator electrodes are arranged. An image sensor on the optical axis and provided at an imaging position of the optical element;
A substrate on which the image sensor is disposed;
The optical device according to claim 1, wherein the detection electrode is disposed on a substrate on which the imaging element is disposed.

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