JP5101683B2 - Lens transfer device - Google Patents

Description

  The present invention relates to a lens transfer device used for transferring an optical pickup lens and a camera lens of a media-related device, and more specifically, a drive motor in which a lead screw is coupled to an output shaft having a certain length; A base on which the drive motor is mounted, a nut that is screwed to the lead screw and moves linearly as the drive motor rotates, and a lens is mounted along with the linear movement of the nut to light the lens A lens transfer device including a lens holder portion that moves in an axial direction, wherein the base has an outer periphery with respect to a through hole provided in a vertical wall surface perpendicular to the optical axis direction on which the drive motor is mounted. By having an opening that extends, the drive motor and the nut are pre-threaded and then engaged with the base Obtained was thus provide improved savings and operating loss of production cost, a lens transfer device.

  In an optical pickup lens and a camera lens of a media-related device, a lens transfer device that transfers the lens for correcting aberrations of the lens includes a drive motor in which a lead screw is coupled to an output shaft having a certain length. A base on which the drive motor is mounted, a nut that is screwed to the lead screw and moves linearly as the drive motor rotates, and a lens is mounted along with the linear movement of the nut. And a lens holder portion that is moved in the optical axis direction.

  In the operation process of moving the lens in the optical axis direction, the lead screw coupled to the output shaft of the drive motor rotates as the drive motor rotates, and the lead screw rotates to the lead screw as the lead screw rotates. The screwed nut moves linearly. At this time, the nut linearly moves a lens holder transfer operation unit that moves the lens holder unit in the optical axis direction of the lens. A lens holder that moves in conjunction with the linear movement of the lens holder transfer operation unit moves the lens in the optical axis direction.

  In the conventional assembly structure of the lens transfer device as described above, when a motor as a drive source is assembled and mounted on the base, a positioning hole is engaged with the drive motor on one surface of the base perpendicular to the optical axis direction. Protrusions were provided, and a method of assembling the positioning holes and engaging protrusions of the drive motor was used.

  The positioning hole is larger than the outer diameter of the lead screw, and is manufactured in a mechanical relationship that is the same as or larger than the outer diameter of the engaging protrusion of the drive motor.

In the assembly structure as described above, after assembling the drive motor on the base, an assembly method in which the nut is screwed onto a lead screw coupled to the output shaft of the drive motor has been used. At this time, since the outer diameter of the nut is larger than that of the positioning hole, the nut cannot be assembled through the positioning hole.
As described above, when the nut is assembled after the drive motor is mounted on the base, there is a problem in that the manufacturing cost for the process is increased and the work loss is large during the assembly.

  The present invention is to solve the above-described problems of the prior art, and an object of the present invention is to provide a drive motor in which a lead screw is coupled to an output shaft having a certain length, and the drive motor is mounted. A base that is screwed to the lead screw and linearly moves as the drive motor rotates, and a lens that is attached to move the lens in the optical axis direction along with the linear movement of the nut. A lens transfer device including a holder portion, wherein an opening extending outward from a through hole provided in a vertical wall surface perpendicular to an optical axis direction in which the drive motor is mounted is provided in the base. Thus, after the drive motor and the nut are screwed together in advance, it can be mounted on the base, thereby reducing the manufacturing cost and improving the work loss. And to provide a the lens driving device.

To achieve the above object, the present invention includes a driving motor lead screw is coupled to an output shaft having a predetermined length, it is screwed before Symbol lead screw, linear movement as said drive motor rotates A lens holder unit that includes a lens holder moving operation unit that contacts the nut and moves the lens holder on which the lens is mounted in the optical axis direction along with the linear movement of the nut, and the drive motor, wherein a nut and a lens transport apparatus comprising a base, a said lens holder portion is attached to said base, provided with a vertical perpendicular walls surface with respect to the optical axis direction in which the drive motor is mounted is Rutotomoni, said lead screw, said nut and said lens holder transporting operation unit space for receiving are provided, on the vertical wall, a through hole And an opening extending from the outer peripheral edge of the through hole is further provided, and the nut and the lens holder transfer operation unit are guided by a first shaft provided in the base and moved in the optical axis direction. The width of the opening is larger than the diameter of the output shaft of the drive motor, and is equal to or smaller than the diameter of the through hole .

Here, a second shaft provided on the opposite side to the first shaft with respect to the lead screw is provided, and the second shaft penetrates the lens holder portion in the optical axis direction. .

  The drive motor to which the nut is coupled is directly attached to the base through the opening, and the main body of the drive motor is disposed outside the base.

  The thickness of the vertical wall surface is smaller than the length of the output shaft.

  The thickness of the vertical wall surface is smaller than the length between the end of the lead screw and the drive motor case when the output shaft is pulled to the maximum extent from the drive motor in the output shaft direction.

  The lens transfer device according to the present invention has a structure in which the drive motor is connected to the lead screw that is coupled to the output shaft of the drive motor that is engaged with the base. The drive motor and the nut are screwed together in advance by having an opening extending outwardly with respect to a through hole provided in a vertical wall surface perpendicular to the direction of the optical axis to be mounted. As a result, it is possible to reduce not only manufacturing costs but also work losses.

It is a perspective view showing the state where the lens transfer device concerning the present invention was assembled. It is a perspective view which shows the base of the lens transfer apparatus which concerns on this invention. It is a figure which shows an example of the drive motor applied to this invention.

  The lens transfer device according to the present invention will be specifically described below with reference to the accompanying drawings.

  1 is a perspective view showing a state in which a lens transfer device according to the present invention is assembled, FIG. 2 is a perspective view showing a base of the lens transfer device according to the present invention, and FIG. 3 is an example of a drive motor applied to the present invention. FIG.

  As shown in FIG. 1, the lens transfer device according to the present invention includes a drive motor 20 having a lead screw coupled to an output shaft having a certain length, a base 10 to which the drive motor 20 is mounted, A nut 30 that is screwed into the lead screw 22 and linearly moves as the drive motor 20 rotates, and a lens 60 is attached and moves the lens 60 in the optical axis direction as the nut 30 moves linearly. And a lens holder portion.

  As shown in FIGS. 1 and 3, the drive motor 20 protrudes by a certain length from the drive motor main body serving as a drive source of the drive motor, and rotates by the rotational force from the drive motor main body. An output shaft, a lead screw 22 coupled to the output shaft and having a thread, an FPC (Flexible Printed Circuit) 24 for generating a control signal for controlling the drive motor body, and application of an electric signal from the outside The output shaft protrudes from the drive motor main body and is composed of an output shaft 21 that is a part before being coupled to the lead screw 22 and the lead screw 22. The

  A first shaft 40 is provided on one side of the base 10. The first shaft 40 guides a portion of the nut 30 that is extended from a portion screwed with the lead screw 22, and moves in the optical axis direction without swinging when the nut 30 moves linearly. In addition to making it move smoothly, it guides one side of a lens holder transfer operation unit 74, which will be described later, so that the lens holder transfer operation unit 74 can move smoothly in the optical axis direction without swinging. Fulfill.

  The lens holder portion is provided on a lens holder 71 to which the lens 60 is mounted, a lens holder support portion 72 that supports the lens holder 71 in the optical axis direction, and a side surface of the lens holder support portion 72, and a second shaft. A shaft penetrating portion 73 provided with a partition wall through which 50 can penetrate in the optical axis direction, and a coil spring 51 provided on one side of the second shaft 50 can be contracted and loosened on the other surface in the optical axis direction. The other side surface of the shaft penetrating portion 73 is provided so as to be long perpendicular to the optical axis direction and comes into contact with the nut 30 and linearly moves in the optical axis direction in conjunction with the linear movement of the nut 30. The lens holder transfer operation unit 74 and the like are integrally formed.

  As the drive motor 20 rotates, the nut 30 linearly moves in the optical axis direction. As the nut 30 moves linearly, the lens holder transfer operation unit 74, the shaft through portion 73, and the lens holder are supported. The part 72 and the lens holder 71 also move linearly in the optical axis direction in conjunction with each other, but the shaft penetration part 73 contracts and relaxes the coil spring 51 along the linear movement direction.

  As the coil spring 51 contracts and relaxes, the lens holder 71 moves elastically in the optical axis direction.

  As shown in FIG. 2, the base 10 has an “L” shape. A space for accommodating the second shaft 50 and the coil spring 51 is provided on the left side of FIG. A vertical wall surface 11 perpendicular to the optical axis direction is provided, and an internal space defined by the vertical wall surface 11 accommodates a lead screw 22 of the drive motor 20 and is defined by the vertical wall surface 11. The main body of the drive motor 20 is disposed in the external space.

  The vertical wall surface 11 is provided with a through hole 12 in which the output shaft 21 of the drive motor is installed, and the through hole 12 has an opening 13 extending outwardly.

  As shown in FIGS. 1 and 2, the opening 13 preferably extends upward in the vertical direction, but is provided so as to be inclined upward at a certain angle or a structure into which the output shaft 21 can be inserted. If so, it may be provided in any direction such as a side surface or downward.

  The through-hole 12 having the opening 13 has a keyhole shape when viewed from the direction in which the optical axis is projected.

  A bearing (not shown) that supports the output shaft 21 of the drive motor 20 when the drive motor 20 is mounted on the base, and prevents the bearing from coming off and engages with the through hole 12 of the base 10. Further, a ring member 25 is provided. Inside the base 10, a photo interrupter 80 is provided as a sensor capable of detecting the position of the lens holder portion.

  The diameter of the output shaft 21 in the drive motor 20 is smaller than the diameter of the lead screw 22.

  The width of the opening 13 is equal to or smaller than the diameter of the through hole 12 and larger than the diameter of the output shaft 21.

  Further, the thickness of the vertical wall surface 11 is made smaller than the length of the output shaft 21 protruding from the main body of the drive motor 20. The thickness of the vertical wall surface 11 is preferably smaller than the length between the end of the lead screw 22 and the drive motor case when the output shaft 21 is pulled to the maximum extent from the drive motor in the output shaft direction.

  Since the outer diameter of the output shaft 21 of the drive motor 20 passes through the keyhole-shaped opening 13 and the ring member 25 is engaged with the through-hole 12 provided in the vertical wall surface 11, the through-hole The drive motor 20 can be mounted on the base 10 even when a nut larger than 12 is screwed.

  That is, as described above, the structure of the base 10 has an opening 13 extending outward from the through hole 12 provided in the vertical wall surface 11 perpendicular to the optical axis direction where the drive motor 20 is mounted. Thus, since the drive motor 20 and the nut 30 are screwed together in advance, the drive motor 20 and the nut 30 can be attached to the base 10, so that there is an advantage that the lens transfer device can be easily assembled.

  Although the present invention has been described with reference to the preferred embodiments, those skilled in the art will recognize that the present invention is within the scope and spirit of the invention described in the claims. It will be understood that various modifications and changes may be made.

DESCRIPTION OF SYMBOLS 10 Base 11 Vertical wall surface 12 Through-hole 13 Opening part 20 Drive motor 21 Output shaft 22 Lead screw 23 Terminal part 24 FPC
25 Ring member 30 Nut 40 First shaft 50 Second shaft 51 Coil spring 60 Lens 71 Lens holder 72 Lens holder support portion 73 Shaft penetration portion 74 Lens holder transfer operation portion 80 Photo interrupter

Claims (5)

A drive motor lead screw is coupled to an output shaft having a predetermined length, is screwed before Symbol lead screw, and a nut that performs linear movement as the drive motor is rotated, in contact with the said nut, said A lens holder unit including a lens holder transfer operation unit that moves a lens holder on which a lens is mounted in the optical axis direction along with a linear movement of the nut, and a base on which the drive motor, the nut, and the lens holder unit are mounted A lens transfer device comprising:
Wherein the base, Rutotomoni provided perpendicular vertical wall surface with respect to the optical axis direction in which the drive motor is mounted, the lead screw, the nut and the space for accommodating the lens holder transfer operation portion is provided,
The vertical wall surface is provided with a through hole, and further provided with an opening extending from the outer peripheral edge of the through hole,
The nut and the lens holder transfer operation unit are guided by a first shaft provided on the base and move in the optical axis direction,
The width of the opening is larger than the diameter of the output shaft of the drive motor, and is equal to or smaller than the diameter of the through hole .   A second shaft provided on the opposite side of the first shaft with respect to the lead screw;
  The lens transfer device according to claim 1, wherein the second shaft penetrates the lens holder portion in an optical axis direction.   The drive motor coupled with the nut is directly attached to the base through the opening,
  The lens transfer device according to claim 1, wherein a main body of the drive motor is disposed outside the base. The thickness of the vertical wall being smaller than the length of the output shaft, the lens driving device as set forth in any one of claims 1 to 3. The thickness of the vertical wall surface is smaller than the length between the terminal end of the lead screw and the drive motor case when the output shaft is pulled from the drive motor to the maximum in the output shaft direction. Item 5. The lens transfer device according to Item 4 .

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