TWI686038B - Voice coil motor - Google Patents

Abstract

A voice coil motor includes a base, a magnetic component, a carrier and at least one insulation substrate. The magnetic component is disposed in the base. The carrier is movably disposed in the base. The insulation substrate is disposed at a periphery of the carrier and includes a coil and a wire. The coil is formed to be embedded in the insulation substrate and faces the magnetic component. A bottom surface of the coil is lower than a top surface of the insulation substrate. The wire is connected to the coil and extended to an edge of the insulation substrate.

Description

Voice coil motor

The embodiments of the present invention relate to a voice coil motor, and particularly to a voice coil motor with a coil embedded.

The voice coil motor has the advantages of small size, low power consumption, and low price. It is suitable as a driver for electronic products with camera functions such as digital cameras, mobile phones, and digital video cameras.

The existing voice coil motor usually includes a copper wire coil, a movable bearing base and a magnet. The coil is wound on the outer wall of the movable carrier, the magnet is opposite to the coil, and the movable carrier is used to accommodate the lens. When current is applied to the coil, the interaction force between the coil and the magnet will drive the movable carrier to move along the optical axis of the lens, thereby changing the distance between the lens and the image sensor of the electronic product to achieve zooming. effect.

In the assembly process of the voice coil motor, it is usually necessary to manually wind the copper wire around the outer wall of the movable carrier to form a coil. Because the copper wire is extremely thin, it is easy to break during winding. In addition, after the winding is completed, the reserved copper wire used as a conductive lead is often easily broken in the paint stripping and welding process. The above-mentioned factors lead to material waste and even lower product yield.

Embodiments of the present invention provide a voice coil motor, which can have a higher yield.

The voice coil motor of the embodiment of the present invention includes a base, a magnetic element, a carrying base and at least one insulating substrate. The magnetic element is arranged in the base. The bearing seat is movably arranged in the base. The insulating substrate is disposed around the carrier and includes a coil and a wire. The coil is formed and embedded in the insulating substrate and faces the magnetic element. A bottom surface of the coil is lower than a top surface of the insulating substrate. The wire is connected to the coil and extends to an outer edge of the insulating substrate.

In an embodiment of the invention, the above-mentioned coil is suitable for electrical conduction through a wire, and generates magnetic induction with a magnetic element to drive the carrier to move relative to the base.

In an embodiment of the invention, the above-mentioned bearing base includes a bearing groove, and the bearing groove is suitable for carrying a lens to drive the lens to move relative to the base when the bearing base moves relative to the base.

In an embodiment of the invention, the above-mentioned insulating substrate further includes a coil trench formed by laser, at least part of the coil is buried in the coil trench.

In an embodiment of the present invention, a width of the above-mentioned coil groove decreases from the top surface of the insulating substrate away from the top surface.

In an embodiment of the invention, the above-mentioned coil includes an embedded portion and a protruding portion, the embedded portion fills the coil groove, the protruding portion is connected to the embedded portion and protrudes from the top surface of the insulating substrate.

In an embodiment of the invention, a thickness of the above-mentioned buried portion is substantially between 20 μm and 40 μm.

In an embodiment of the invention, a thickness of the protrusion is substantially between 5 microns and 15 microns.

In an embodiment of the present invention, the number of the above-mentioned insulating substrates is multiple, which are respectively arranged around the carrier.

Based on the above, the voice coil motor of the embodiment of the present invention embeds at least part of the coil in the insulating substrate, so that the coil can generate magnetic induction with the magnetic element disposed in the base after conduction, thereby generating a driving force for the movable carrier, To drive the carrier to move relative to the base. Furthermore, the lens in the bearing seat is moved relative to the base to realize the zoom function. In this way, the coil of this embodiment can be formed in the insulating substrate by the method of embedding the circuit, so there is no need to manually wind the copper wire around the carrier to cause the copper wire to break, and there is no need to pass the plating on the top surface of the insulating substrate. A high-thickness coil is formed at a time, but the coil is at least partially embedded in the insulating substrate, thereby improving the yield of the manufacturing process. Therefore, the voice coil motor of the embodiment of the present invention can effectively improve the process yield.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

100‧‧‧Voice coil motor

110‧‧‧Dock

120‧‧‧Magnetic components

130‧‧‧Carrier

132‧‧‧Bearing slot

140‧‧‧Insulated substrate

142‧‧‧coil

142a‧‧‧Seed layer

144‧‧‧wire

146‧‧‧coil groove

150‧‧‧patterned photoresist layer

160‧‧‧Guide column

D1, D2‧‧‧thickness

S1‧‧‧Top

S2‧‧‧Bottom

W1‧‧‧Width

FIG. 1 is a schematic diagram of a voice coil motor according to an embodiment of the invention.

2 is a schematic top view of an insulating substrate of a voice coil motor according to an embodiment of the invention.

3 to 6 are coils of a voice coil motor according to an embodiment of the invention Schematic diagram of the production process.

FIG. 1 is a schematic diagram of a voice coil motor according to an embodiment of the invention. 2 is a schematic top view of an insulating substrate of a voice coil motor according to an embodiment of the invention. Please refer to FIG. 1 and FIG. 2 at the same time. The voice coil motor 100 of this embodiment can be applied to a lens of an electronic device as a mechanism for achieving zoom. In this embodiment, the voice coil motor 100 includes a base 110, a magnetic element 120, a carrier 130, and at least one insulating substrate 140. The magnetic element 120 is disposed in the base 110. In this embodiment, the magnetic element 120 can be, for example, a permanent magnet. The carrier 130 is movably disposed in the base 110. The insulating substrate 140 is disposed around the carrier 130, and as shown in FIG. 2, the insulating substrate 140 includes a coil 142 and a wire 144. The coil 142 is formed on the insulating substrate 140 and is at least partially embedded in the insulating substrate 140. The coil 142 faces the magnetic element 120 and is suitable for generating magnetic induction with the magnetic element 120. The wire 144 is connected to the coil 142 and extends to the outer edge of the insulating substrate 140.

In this configuration, the wire 144 can be connected to a power source, so that the coil 142 can be electrically conducted through the wire 144 to generate an electromagnetic field, and the electromagnetic field and the magnetic field of the magnetic element 120 generate magnetic induction to generate the driving force of the movable carrier 130 to The carrier 130 is driven to move relative to the base 110. In this embodiment, the number of insulating substrates 140 is plural, and can be symmetrically arranged around the carrier 130 as shown in FIG. 1 to provide a driving force to the carrier 130 symmetrically and evenly. In this embodiment, the bearing base 130 includes a bearing slot 132 as shown in FIG. When carrying a lens, when the carrying base 130 moves relative to the base 110, the lens is driven to move relative to the base 110, thereby changing the distance between the lens in the lens and the image sensor, thereby achieving the zoom function. In this embodiment, the voice coil motor 100 may further include a plurality of guide posts 160 to guide the carrier 130 to move along the optical axis of the lens.

3 to 6 are schematic cross-sectional views of a manufacturing process of a coil of a voice coil motor according to an embodiment of the invention. The method for manufacturing the coil of the voice coil motor of this embodiment may include the following steps. Referring to FIG. 3 first, a coil groove 146 formed by laser is formed on the insulating substrate 140. As such, the bottom surface of the coil trench 146 is lower than the top surface S1 of the insulating substrate 140, and the width W1 of the coil trench 146 can be reduced from the top surface S1 of the insulating substrate 140 away from the top surface S1 as shown in FIG. small.

Next, referring to FIG. 4, an electroless plating process is performed on the surface of the insulating substrate 140 to form a seed layer 142 a, wherein the seed layer 142 a covers the top surface S1 of the insulating substrate 140 and the inner wall of the coil trench 146. Next, a patterned photoresist layer 150 is formed on the insulating substrate 140, and the opening of the patterned photoresist layer 150 exposes the coil trench 146 as shown in FIG.

Next, referring to FIG. 5, the patterned photoresist layer 150 is used as a mask, and the seed layer 142 a is used as a plating path to perform an electroplating process to form the coil 142 shown in FIG. 5. The electroplating process of this embodiment may, for example, connect a power source to the outer edge of the insulating substrate 140 to connect the wires 144, and then may conduct electroplating through the conductive path provided by the wires 144 to form the coil 142.

Next, as shown in FIG. 6, the patterned photoresist layer 150 is removed, and a portion of the seed layer 142a exposed by the patterned photoresist layer 150 is removed, thereby forming this embodiment. Of the coil 142. Of course, this embodiment is for illustration only. In other embodiments, the coil 142 can also be formed on the insulating substrate 140 by using the circuit manufacturing process of other circuit boards, as long as at least part of the coil 142 is buried in the coil groove 146 can.

In this embodiment, at least part of the coil 142 is buried in the coil trench 146, and the bottom surface S2 of the coil 142 is lower than the top surface S1 of the insulating substrate 140. For example, the coil 142 may include an embedded portion and a protruding portion, wherein the embedded portion fills the coil trench 146, the protruding portion is connected to the embedded portion, and protrudes above the top surface S1 of the insulating substrate 140. As such, in this embodiment, it is not necessary to form a high-thickness coil at a time through electroplating on the top surface S1 of the insulating substrate 140, but the coil 142 is at least partially embedded in the insulating substrate 140, thereby improving the yield of the manufacturing process. For example, the thickness D1 of the buried portion is approximately between 20 μm and 40 μm. The thickness D2 of the protrusion may be between 5 microns and 15 microns. In this embodiment, the thickness D1 of the buried portion is about 30 microns, and the thickness D2 of the protrusion is about 10 microns. Of course, the embodiment of the present invention is not limited.

In summary, the voice coil motor of the embodiment of the present invention embeds at least a part of the coil in the insulating substrate, so that the coil can generate magnetic induction with the magnetic element disposed in the base after being turned on, thereby generating the driving of the movable carrier Force to drive the carrier to move relative to the base. Furthermore, the lens in the bearing seat is moved relative to the base to realize the zoom function.

With this configuration, the coil of this embodiment can be formed in the insulating substrate using the method of embedding the circuit, so there is no need to manually wind the copper wire around the carrier to cause the copper wire to break, and there is no need to pass plating on the top surface of the insulating substrate While forming high The thickness of the coil is to bury the coil at least partially in the insulating substrate, which can improve the yield of the manufacturing process. Therefore, the voice coil motor of the embodiment of the present invention can effectively improve the process yield.

Although the present disclosure has been disclosed as above with the embodiments, it is not intended to limit the embodiments of the present invention. Any person with ordinary knowledge in the technical field can make some changes without departing from the spirit and scope of the embodiments of the present invention. With retouching, the scope of protection of the embodiments of the present invention shall be deemed as defined by the appended patent application.

100‧‧‧Voice coil motor

110‧‧‧Dock

120‧‧‧Magnetic components

130‧‧‧Carrier

132‧‧‧Bearing slot

140‧‧‧Insulated substrate

160‧‧‧Guide column

Claims (7)

A voice coil motor includes: a base; a magnetic element disposed in the base; a supporting base movably disposed in the base; and at least one insulating substrate disposed around the supporting base and It includes a coil and a wire, wherein the insulating substrate further includes a coil groove formed by laser, at least part of the coil is embedded in the coil groove, the coil is formed and embedded in the insulating substrate and faces the magnetic Device, a bottom surface of the coil is lower than a top surface of the insulating substrate, wherein the coil includes an embedded portion and a protruding portion, the embedded portion fills the coil groove, the protruding portion connects and protrudes from the embedded portion On the top surface of the insulating substrate, the wire is connected to the coil and extends to an outer edge of the insulating substrate. The voice coil motor as described in Item 1 of the patent application range, wherein the coil is adapted to be electrically conducted through the wire, and generates a magnetic induction with the magnetic element to drive the carrier to move relative to the base. The voice coil motor as described in item 1 of the patent application scope, wherein the bearing base includes a bearing groove, the bearing groove is suitable for carrying a lens, so as to drive the lens relative to the base when the bearing base moves relative to the base mobile. The voice coil motor as described in item 1 of the patent application range, wherein a width of the coil groove decreases from the top surface of the insulating substrate away from the top surface. The voice coil motor as described in item 1 of the patent application range, wherein a thickness of the embedded portion is substantially between 20 μm and 40 μm. The voice coil motor as described in item 1 of the patent application range, wherein a thickness of the protrusion is substantially between 5 microns and 15 microns. The voice coil motor as described in item 1 of the patent application range, wherein the number of the insulating substrates is plural, which are symmetrically arranged around the carrier.

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