JP2004325830A - Optical part drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the drive unit of an optical part whose structure is simple and by which the optical part is precisely driven even though it is made small-sized, light in weight and inexpensive. <P>SOLUTION: The drive unit of the optical part possesses the optical part (10), a support member to support the optical part in a specified direction in a movable state through a suspension (40) having elasticity, an electric coil (20) provided at the optical part, a metallic land (30) provided at the optical part and a permanent magnet (50) provided at a position corresponding to the electric coil on the supporting member. The electric coil and the metallic land are respectively and directly formed on the optical part in a coating state. The suspension is soldered to the metallic land. Voltage is applied to the electric coil, so that the optical part is driven in the specified direction by the electromagnetic induction work of the permanent magnet and the electric coil. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical component such as a lens and an optical component driving device having a means for driving the optical component.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an optical pickup device in an optical disk drive for handling an optical disk such as a CD and a DVD or a magneto-optical disk such as an MO, an optical unit in a digital camera, an optical unit in a camera-equipped mobile phone, and a so-called silver halide having an electric zoom Optical components such as lenses, polarizers, analyzers, optical prisms, wave plates, mirrors, and half mirrors are used for optical means in film cameras, etc., optical means in liquid crystal projectors, and optical means in scanners. Have been.
[0003]
Some of these optical components are fixedly attached to the support member, while others are supported by the support member and driven in the predetermined direction while being movable in a predetermined direction.
[0004]
The driven optical component is, for example, one that is supported by the support member while being movable in a predetermined direction with respect to the support member and driven by a power source in order to perform functions such as focusing, zooming, and scanning. is there. The drive power source may be artificial or purely mechanical. However, in a device having a configuration using at least a part of electricity as described above, an electromagnetic induction effect may be used (such as a rotary motor or a rotary motor). Linear motors (voice coils), which are electrically driven using a piezoelectric effect. These optical components include those made of glass and those made of resin.
[0005]
2. Description of the Related Art Conventionally, in an optical component driving device having a relatively small optical component and a means for driving the optical component, one of components of a voice coil, that is, an optical component to which an electric coil or a permanent magnet is attached and a plastic lens or the like is attached. Is generally supported via a suspension by the other of the components of the voice coil, that is, a supporting member to which a permanent magnet or an electric coil is attached, while being movable in a predetermined direction. .
[0006]
In an optical component driving device used for relatively precise equipment, positioning of an optical component such as a plastic lens is important. Therefore, the optical component is bonded to the holder with an ultraviolet curing resin, an epoxy adhesive, or the like. Fixed.
[0007]
Also, the electric coil is adhered to a holder or a support member as an electric coil assembly formed by winding a thin wire around a bobbin and fixed with an adhesive or the like, or is adhered after winding a thin wire around the holder or the support member. By being fixed with an agent or the like, it is attached to the holder or the support member.
[0008]
[Patent Document 1]
JP 2001-256660 A
[Problems to be solved by the invention]
In recent years, the above-described optical disk drive, digital camera, camera-equipped mobile phone, and the like have been required to be further reduced in size, weight, and cost. And cost reduction are required.
[0010]
In particular, since an optical component driving device having an optical component and a means for driving the optical component must movably support and drive the optical component, it is usually inevitable that the optical component has a complicated structure. This is a major factor that hinders downsizing, weight reduction, and cost reduction. Conversely, if the optical component driving device can be reduced in size, weight, and cost, it is very useful and desirable for reducing the size, weight, and cost of the device.
[0011]
Therefore, an object of the present invention is to provide an optical component driving device which has a simple structure, is small in size, light in weight, and low in cost, but can precisely drive an optical component.
[0012]
[Means for Solving the Problems]
According to the present invention, an optical component (10), a supporting member that supports the optical component in a movable state in a predetermined direction via an elastic suspension (40), and an electric coil ( 20), a metal land (30) provided on the optical component, and a permanent magnet (50) provided on the support member at a position corresponding to the electric coil. Each of the metal lands is formed directly on the optical component in the form of a coating, and the suspension is soldered to the metal lands, and by applying a voltage to the electric coil, the permanent magnet is formed. An optical component driving device characterized in that the optical component is driven in the predetermined direction by an electromagnetic induction action between the optical component and the electric coil.
[0013]
According to the present invention, at least one of the metal lands is electrically connected to the electric coil, and at least one of the suspensions has conductivity and is connected to the electric coil. By applying a voltage to the electric coil through the suspension having conductivity and being soldered to a metal land and the metal land to which the suspension is soldered, the optical component is provided with the permanent magnet. The optical component driving device driven in the predetermined direction by the electromagnetic induction action between the optical component and the electric coil is obtained.
[0014]
According to the present invention, there is further provided the optical component driving device, wherein two or more of the metal lands connected to the electric coil and the conductive suspension are provided for each of the electric coils. Can be
[0015]
Further, according to the present invention, the optical component drive device in which the suspension has a wire shape or a strip shape is obtained.
[0016]
Further, according to the present invention, the optical component has a line-symmetric or rotationally symmetric shape, and the plurality of suspensions are provided in a symmetrical arrangement corresponding to the symmetric shape of the optical component. A device is obtained.
[0017]
According to the present invention, the optical component driving device is obtained in which the optical component is a plastic lens, a plastic prism, or a plastic optical plate.
[0018]
According to the present invention, there is further obtained the optical component driving device, wherein the electric coil and the metal land are formed on a portion other than a functional surface that performs an optical function of the optical component.
[0019]
Further, according to the present invention, the optical component driving device in which the electric coil and the metal land are formed on the optical component using MID technology can be obtained.
[0020]
It should be noted that the reference numerals in the parentheses are added to facilitate understanding of the present invention, and the present invention is not limited to these.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
1 and 2, an optical component driving device according to the present invention is, for example, a focusing adjustment device for an objective lens in an optical pickup device, and includes a plastic lens 10 and a plastic lens 10 via an elastic suspension 40. (Not shown) for supporting the lens in a predetermined direction (vertical direction in the figure), an electric coil 20 provided on the plastic lens 10, and a metal land 30 provided on the plastic lens 10. And a permanent magnet 50 provided at a position corresponding to the electric coil 20 on the support member.
[0023]
The plastic lens 10 is a convex lens protruding downward in the figure.
[0024]
Each of the electric coil 20 and the metal land 30 is formed directly on the plastic lens 10 in the form of a film using a three-dimensional injection circuit component (MID: Molded Interconnect Device) technology described later.
[0025]
The plastic lens 10 has a line-symmetric or rotationally symmetric shape (in the present example, a substantially disk shape), and two suspensions 40 are provided in a symmetrical arrangement according to the symmetric shape of the optical component. . That is, they are provided at intervals of 180 degrees. Thereby, it is stably movably supported. Note that the number of symmetrical arrangements of the suspensions 40 is not limited to two at 180-degree intervals, but may be three at every 120 or four at 90-degree intervals. The number and position of the permanent magnets 50 are also determined so as to perform an electromagnetic induction action with the electric coil 20 as described later, but are further determined in consideration of the position and number of the suspension 40. Is also good.
[0026]
Further, the suspension 40 does not have to be wire-shaped as in this example, but may be strip-shaped or coil-spring-shaped.
[0027]
Each of the metal lands 30 connected to the electric coil 20 and the conductive suspension 40 is provided two for one electric coil 20. Thereby, as described later, the support of the plastic lens 10 and the supply of power to the electric coil 20 can be shared.
[0028]
Each of the two metal lands 30 is electrically connected to an end of the electric coil 20. In this example, the metal lands 30 are formed in a series on the electric coil 20 in advance by MID technology. The suspension 40 has conductivity and is soldered to a metal land 30 connected to the electric coil 20. By applying a voltage to the electric coil 20 via the suspension 40 and the metal land 30 to which the suspension 40 is soldered, the plastic lens 10 is moved in a predetermined direction by the electromagnetic induction between the permanent magnet 50 and the electric coil 20. Is driven.
[0029]
According to the present invention, the electric coil 20 and the metal land 30 are further formed on a portion other than the functional surface of the plastic lens 10 that performs the optical function. That is, in this example, the electric coil 20 and the metal lands 30 are formed on the side surfaces other than the upper and lower main surfaces, which are the functional surfaces performing the optical function of the plastic lens 10.
[0030]
Now, as a method of forming an electric coil and a metal land using the MID technique, for example, after applying an electroless plating such as Cu to a plastic lens 10 which is an injection molded product, a resist having a desired circuit pattern is applied. Perform etching.
[0031]
In addition, a method of forming a circuit pattern by directly punching a copper foil with a heated stamping die, and press-fitting the resin into a resin molded product to make it adhere to the resin molded product may be used. This method is also called MID-IVONDING method.
[0032]
The optical components in the optical component driving device according to the present invention are not limited to lenses, but other optical components that need to be driven for operation and adjustment, such as a polarizer, an analyzer, an optical prism, a wave plate, and a mirror. Of course, it can be applied to optical components such as a half mirror. The present invention can be applied not only to focusing adjustment but also to an apparatus for operating and adjusting various optical functions such as an optical zoom mechanism. Further, the optical component driving device according to the present invention is an optical pickup device, a digital camera, a camera-equipped mobile phone, and a silver halide film camera equipped with an electric zoom in an optical disk drive that handles optical disks such as CDs and DVDs or magneto-optical disks such as MOs. , A liquid crystal projector, or a scanner.
[0033]
【The invention's effect】
As described above, the optical component driving device according to the present invention has a simple structure, is small in size, light in weight, and low in cost, but can drive optical components precisely.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of an optical component driving device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an optical component driving device according to the embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 plastic lens 20 electric coil 30 metal land 40 suspension wire 50 permanent magnet

Claims (8)

An optical component, a support member that supports the optical component in a movable state in a predetermined direction via an elastic suspension, an electric coil provided on the optical component, and a metal land provided on the optical component. A permanent magnet provided at a position corresponding to the electric coil on the support member,
Each of the electric coil and the metal land is directly formed on the optical component in a film shape,
The suspension is soldered to the metal land,
An optical component driving device, wherein by applying a voltage to the electric coil, the optical component is driven in the predetermined direction by electromagnetic induction between the permanent magnet and the electric coil. At least one of the metal lands is electrically connected to the electric coil;
At least one of the suspensions has electrical conductivity and is soldered to the metal land connected to the electric coil;
By applying a voltage to the electric coil via the conductive suspension and the metal land to which the suspension is soldered, the optical component is driven by electromagnetic induction between the permanent magnet and the electric coil. The optical component driving device according to claim 1, wherein the optical component driving device is driven in the predetermined direction. The optical component driving device according to claim 2, wherein two or more of the metal lands connected to the electric coil and the conductive suspension are provided for each electric coil. 4. The optical component driving device according to claim 1, wherein the suspension has a wire shape or a strip shape. The optical component has a line-symmetric or rotationally symmetric shape,
The optical component driving device according to claim 1, wherein a plurality of the suspensions are provided in a symmetrical arrangement according to a symmetrical shape of the optical component. The optical component driving device according to claim 1, wherein the optical component is a plastic lens, a plastic prism, or a plastic optical piece. The optical component driving device according to any one of claims 1 to 6, wherein the electric coil and the metal land are formed on a portion other than a functional surface that performs an optical function of the optical component. The optical component driving device according to any one of claims 1 to 7, wherein the electric coil and the metal land are formed on the optical component by using a MID (Molded Interconnect Device) technique.

Images