JP5011539B2 - Focusing actuator using voice coil motor - Google Patents

Description

  The present invention relates to a focusing actuator using a voice coil motor, and more particularly to a focusing actuator using a voice coil motor that is high performance and can save power.

  A conventional focusing actuator using a voice coil motor mainly includes a fixed frame and a lens mounting cylinder that can be moved and mounted in the fixed frame. However, since the structure of a focusing actuator using these voice coil motors is too complicated, the assembly process is cumbersome and time is wasted. Furthermore, the bonding method of this structure was not ideal and lacked the stability of the structure. Moreover, it was easy to receive foreign matters such as dust.

  Regarding the drawbacks of the focusing actuator using the above voice coil motor, the present inventor has submitted an improvement measure disclosed in the patent literature. The focusing actuator using the improved voice coil motor mainly includes a fixed frame. The fixed frame is constituted by a plastic frame covering a metallic molding. The fixed frame has a space in which four magnets are arranged, and becomes a fixed mounting unit together with the magnets. The fixed mounting unit is used to arrange an activity unit consisting of a lens mounting cylinder and a coil. A bilaterally symmetric elastic support member is disposed between the fixed mounting unit and the lens mounting portion. The fixed mounting unit is disposed in the cover and constitutes a focusing actuator using a voice coil motor.

  Although the above improvement has effectively overcome the shortcomings of focusing actuators using conventional voice coil motors, it has been found that the inventor's long-term use and testing is still insufficient. The first is a defect in the magnetic circuit. The fixed frame is constructed with a plastic frame covering a metal molding. However, because the frame of the fixed frame is an insulator design, the four magnets arranged in the magnet arrangement part in the fixed frame are in contact with each other. The magnetic field lines that were released caused magnetic leakage locally, and the effect of the magnetic circuit could not be fully exhibited.

Second is the complexity of processing. Since the fixed frame is composed of a plastic frame covering a metallic molding, there are naturally processing difficulties and instability in bonding because two different materials are used as one member for processing. . Insufficient stability of the fixed frame on which the magnet was placed indirectly affected the strength of the magnetic field lines. As described above, there is still a need for improvement in the above improvement measures.
Taiwan Patent No. 95210175

SUMMARY OF THE INVENTION A first object of the present invention is to provide a focusing actuator using a voice coil motor capable of saving power with a high performance having an excellent magnetic circuit.
It is a second object of the present invention to provide a focusing actuator using a voice coil motor that increases the stability in assembly and the integrity of a magnetic circuit.

  To achieve the above object, the present invention provides a focusing actuator using a voice coil motor. The improved fixed mounting unit has a separately manufactured plastic fixed frame and a metal rear cover. The fixed mounting unit in which the fixed frame and the metal rear cover are fitted and connected increases the stability of the connection and the performance of the magnetic circuit. In addition, the metal rear cover and the iron frame are newly arranged by arranging the magnet arrangement groove for arranging the magnet between the inner plate body and the outer plate body of the metal rear cover and the iron frame for fixing and sealing the magnet. In the closed space between the magnet and the magnet, the magnetic field lines that radiate can be further concentrated, and a focusing actuator using a voice coil motor having a high performance and a power saving function has been realized.

  As can be seen from the above, in the focusing actuator using the voice coil motor of the present invention, the magnetic circuit acts sufficiently, and the magnetic field lines can be further concentrated, thus enabling power saving. Also, the plastic fixing frame and the metal back cover were made separately, solving the problem of stability due to the combination of materials with different attributes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 6, the focusing actuator 1 using the voice coil motor of the present invention is mainly composed of a fixed mounting unit, an activity unit arranged in the fixed mounting unit, and a fixed mounting unit and an activity unit. It consists of a fixed case part.

  The fixed mounting unit is slightly protruded inwardly formed at two oblique corners inside the plastic fixing frame 10, the storage space 11 inside the rectangular plastic fixing frame 10 having a hollow inside, and the plastic fixing frame 10. The two pairs of symmetrical slide portions 12 are provided. In addition, the fixed mounting unit has a fitting portion 122 formed by an insertion hole 13 penetrating the other pair of oblique corners, and a protruding portion 121 protruding outside the slide portion 12.

  The metal rear cover 14 corresponding to the shape of the plastic fixing frame 10 has a storage space 141 coaxially with the storage space 11 in the center, and has an outer plate body 142 on the outer frame. Has a slope 144 at a location corresponding to the slide portion 12. The bottom of the slope 144 has a fitting groove 143 into which the fitting portion 122 is fitted. Further, the metal rear cover 14 has four inner plate bodies 145 that fit into the slide portion 12 inside the inclined surface 144. Between the inner plate body 145 and the outer plate body 142, there are four magnet arrangement grooves 146 at intervals, and one magnet M is arranged in each magnet arrangement groove 146.

  The activity unit has a lens mounting part 20 and a coil 23 that fits outside the lens mounting part 20. The lens mounting portion 20 includes a cylinder 21 that is disposed in the storage space 11, and a lens is disposed in a lens mounting cylinder 22 having a tap hole shape inside the cylinder 21. The cylindrical body 21 has a coil mounting portion 24 into which the coil 23 is fitted, and the cylindrical body 21 has fitting protrusions 25 protruding at the four corners of the bottom portion. The two elastic support members 30 are disposed at the bottom of the cylindrical body 21 and are fitted with the fitting protrusions 25.

  The case portion has a front cover 50 and a support cover 40 disposed at both ends of the fixed mounting unit. The square support cover 40 has a square relief hole 41 with a protruding rear part used for the cylinder 21 at the center, and has connecting parts 42 at two oblique corners corresponding to the slide part 12. There is a perforation 43 at a position corresponding to the insertion hole 13, and the support cover 40 and the metal rear cover 14 are joined by two fixed insertions A penetrating the perforation 43 and the insertion hole 13. The rectangular front cover 50 has a circular escape hole 51 at the center and a fitting portion 52 corresponding to the protrusion 121 fitted and projected from two corners of the fitting portion 122. The magnet M is fixed in the magnet arrangement groove 146 by the rectangular frame-shaped iron frame 60 arranged between the connecting groove 53 on the inner surface of the front cover 50 and the elastic support member 30, and simultaneously sealed.

  The focusing actuator 1 using the voice coil motor of the present invention can obtain the following two effects by the above-described structural design. The first is power saving. The magnet M is arranged in the magnet arrangement groove 146 of the metal rear cover 14 and is fixed by the iron frame 60. In addition, an insulating plastic fixing frame 10 is placed on the outside of the metal rear cover 14 to fix the outer plate 142 to create a sealed space. The lines of magnetic force emitted by the magnet M in the magnet arrangement groove 146 are further concentrated in the sealed space. The magnet M in the magnet arrangement groove 146 and the inner plate 145 are designed to be in parallel contact with each other, so that conventional magnetic leakage can be solved, the magnetic circuit is further concentrated in the sealed space, and the voice coil motor is The function of the used focusing actuator 1 was improved and further power saving was promoted.

  Secondly, the member processing is simplified. The plastic fixing frame 10 and the metal rear cover 14 having different attributes are made of independent fitting members, and are separately manufactured and quickly assembled by a fitting method. It not only solves the complexity of fixed frame joining processes consisting of materials with different attributes, and stability problems due to the joining of materials with different attributes, but also indirectly increases the integrity of the magnetic circuit.

  Although preferred embodiments of the present invention have been disclosed as described above, they are not intended to limit the present invention in any way, and anyone skilled in the art is within the spirit and scope of the present invention. Various changes and modifications can be made. For example, as shown in FIG. 7, there is a fitting lump 241 protruding on the surface of the coil mounting portion 24 of the rectangular cylinder 21 and is fitted to four coils 23a having a fitting groove in the center. This is also within the scope of protection of the present invention. Therefore, the scope of protection of the present invention is based on the contents specified in the claims.

It is a perspective view which shows the focusing actuator using the voice coil motor by one Embodiment of this invention. It is a perspective view which shows the focusing actuator using the voice coil motor by one Embodiment of this invention. It is a perspective view which shows the focusing actuator using the voice coil motor by one Embodiment of this invention. It is a top view which shows the focusing actuator using the voice coil motor by one Embodiment of this invention. It is sectional drawing of AA of FIG. It is sectional drawing of BB of FIG. It is a perspective view which shows the focusing actuator using the voice coil motor by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Actuator 10 Plastic fixed frame 11 Storage space 12 Slide part 121 Projection part 122 Fitting part 13 Insertion hole 14 Metal rear cover 141 Storage space 142 Outer plate body 143 Fitting groove 144 Slope 145 Inner plate body 146 Magnet arrangement groove 20 Lens mounting portion 21 Tube 22 Lens mounting tube 23 Coil 23a Coil 24 Coil mounting portion 241 Fitting lump 25 Fitting protrusion 30 Elastic support member 40 Support cover 41 Relief hole 42 Connection portion 43 Perforation 50 Front cover 51 Relief hole 52 Fitting Joint 53 Connection groove 60 Steel frame
A Fixed plug-in

M magnet

Claims (6)

A focusing actuator using a voice coil motor having a fixed mounting unit, an activity unit and a case part,
The fixed mounting unit has a plastic fixed frame and a metal rear cover,
The activity unit is located in the fixed mounting unit;
The case portion is configured to couple and fix the fixed mounting unit and the activity unit;
The plastic fixed frame has a rectangular shape on a plane perpendicular to the direction in which the activity unit is driven by the actuator;
The plastic fixing frame has a storage space for arranging the activity unit therein, the plastic fixing frame has a slide part slightly protruding inward formed at an oblique corner, and the slide part is fitted to the outside. Have joints,
The metal rear cover has a quadrangular shape on a plane perpendicular to the direction in which the active unit is driven by the actuator, and has an outer plate body on an outer frame, and the outer plate body includes a fitting portion. It has a fitting groove for fitting the fitting part at the place of contact, and has an inner plate body to which the slide part fits at each corner inside, and between the inner plate body and the outer plate body There are four magnet arrangement grooves, a magnet is arranged in each of the magnet arrangement grooves, and the magnet is fixed by an iron frame arranged between the fixed mounting unit and the case portion. Focusing actuator using a motor. 2. The voice coil motor according to claim 1, wherein the activity unit includes the lens mounting portion disposed in a storage space of the plastic fixed frame and a coil fitted to the outside of the lens mounting portion. There was a focusing actuator. 2. The focusing actuator using a voice coil motor according to claim 1, wherein the activity unit has two elastic support members that are replaced at the tip of the lens mounting portion. The focusing actuator using a voice coil motor according to claim 1, wherein the case portion has a support cover and a front cover disposed at both ends of the fixed mounting unit. The plastic fixing frame has an insertion hole in the slide portion at an oblique corner, and a fitting groove is arranged at a position corresponding to the slide portion in the outer plate body of the metal rear cover. A focusing actuator using the voice coil motor according to claim 1. The coil includes four coils corresponding to a coil mounting portion outside the lens mounting portion having a quadrangular shape on a plane perpendicular to a direction in which the activity unit is driven by the actuator. A focusing actuator using the voice coil motor according to claim 2.

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