Patent Description:
The camera module photographs a subject and stores it as an image or video, and is installed in mobile terminals such as cell phones, laptops, drones, and vehicles.

Meanwhile, portable devices such as smartphones, tablet PCs, and laptops have built-in micro camera modules, and these camera modules automatically adjust the distance between the image sensor and the lens, thereby performing autofocus (AF) function that aligns the focal length of the lens.

In addition, recent camera modules may perform zooming function of zooming up or zooming out which enables photographing of distant subjects with increased or decreased magnification through a zoom lens.

In addition, recent camera modules employ image stabilization (IS) technology to correct or prevent image shaking due to camera movement caused by unstable fixing devices or user movement.

Meanwhile, a camera module being applied to a mobile terminal such as a mobile phone recently uses a prism to reduce the size of a product while implementing a zooming function.

<CIT> discloses a fixed part equipped with the movable plate which is journaled in a swingable state by torsion bars, a driving coil for driving the movable plate, and static electric field producing means which make a static electric field operate on the driving coil, and the movable plate is driven by supplying current to the driving coil to make opposite-directional electromagnetic forces operate on the side parts of the movable plate facing each other and parallel to the axial direction of the torsion bars; and a resistance means applying resistance to the side parts of the movable plate facing each other, the resistance being in a direction opposite to the elastic restoring forces of the torsion bars which are generated accompanying the turning of the movable plate. <CIT> discloses a reflectometer driving device with a multi-axial structure comprising: a support frame in which a first groove part rail is formed and in which a first driving magnet is provided; the reflectometer installed in the support frame, and reflecting light to a lens; a middle frame forming a first guide rail corresponding to the first groove part rail and a second groove part rail, and having a second driving magnet; a base frame forming a second guide rail corresponding to the second groove part rail; a first coil moving the support frame in a first direction perpendicular to an optical axis based on the middle frame by generating an electromagnetic force in the first driving magnet; and a second coil moving the middle frame in a second direction perpendicular to the first direction based on the base frame by generating the electromagnetic force in the second driving magnets.

An object to be solved by the present invention is to provide a prism driving device that can reduce the size of a product.

A prism driving device according to an aspect of the present invention for achieving the above object comprises: a housing; a mover disposed in the housing; a prism disposed in the mover; a first magnet disposed in the mover; a coil disposed in the housing; a guide part disposed between the housing and the mover and configured to guide the tilting of the mover, wherein the first magnet comprises first and second magnet units, wherein the coil comprises first and second coils, wherein the first and second magnet units are configured to tilt the prism and the mover with respect to a first axis through electromagnetic interaction with the first and second coils, characterized in that the prism driving device comprises a second magnet disposed on the housing and facing the first magnet, the second magnet comprises a fourth magnet unit disposed at a position corresponding to the first magnet unit, and the fourth magnet unit is overlapped with the first magnet unit in a direction parallel with the first axis.

In addition, the mover may be supported by the guide part by the repulsive force of the first magnet and the second magnet.

In addition, the central region of the guide part and the first magnet may not be overlapped in an optical axis direction.

In addition, the first magnet may comprise first to third magnet units, and the coil may comprise first to third coils.

In addition, the first magnet unit is disposed on a first side surface of the mover, the second magnet unit is disposed on a second side surface facing the first side surface of the mover, and the third magnet unit may be disposed on a lower surface of the mover.

In addition, the first coil is disposed at a position corresponding to the first magnet unit, the second coil is disposed at a position corresponding to the second magnet unit, and the third coil may be disposed at a position corresponding to the third magnet unit.

In addition, the first and second magnet units allow the mover to be tilted with respect to a first axis, and the third magnet unit may allow the mover to be tilted with respect to a second axis perpendicular to the first axis.

In addition, a normal line of the first side surface may be parallel to the normal line of the second side surface, and the normal line of the first side surface or the second side surface may be orthogonal to the normal line of the lower surface.

In addition, the second magnet may comprise a fourth magnet unit disposed at a position corresponding to the first magnet unit, and a fifth magnet unit disposed at a position corresponding to the second magnet unit.

In addition, the length of the fourth and fifth magnet units in a first direction is longer than the length of the first and second magnet units in a first direction, respectively; and the length of the fourth and fifth magnet units in a second direction perpendicular to the first direction may be shorter than lengths of the first and second magnet units in the second direction, respectively.

In addition, the fourth and fifth magnet units may be disposed higher than central regions of the first and second magnet units, respectively.

In addition, the housing comprises a first groove being formed on an upper surface, and the second magnet may be disposed in the first groove.

In addition, the second magnet may be disposed on one side of the first magnet, and the guide part may be disposed on the other side of the first magnet.

In addition, the guide part may be disposed between the surfaces facing each other of the mover and the housing.

In addition, the guide part may comprise a first protruding portion disposed on a first surface facing the mover and a second protruding portion disposed on a second surface facing the housing.

In addition, the first protruding portion comprises a first protruding unit disposed on one side with respect to the center of the first surface, and a second protruding unit disposed on the other side, wherein the second protruding portion may comprise a third protruding unit disposed at one side with respect to the center of the second surface and a fourth protruding unit disposed at the other side.

In addition, the mover is formed on the outer side surface of the mover facing the first surface and comprises a first recess corresponding to the first protruding portion, wherein the housing is formed on an inner side surface of the housing facing the second surface, and wherein a second recess corresponding to the second protruding portion.

In addition, a substrate being disposed in the housing may be comprised, wherein the coil may be electrically connected to the substrate.

In addition, it may comprise a yoke being disposed between the mover and the first magnet.

A prism driving device according to an aspect of the present invention for achieving the above object comprises: a housing; a mover disposed in the housing; a prism disposed in the mover; a first magnet disposed in the mover; a coil disposed in the housing; a guide part disposed between the housing and the mover to guide tilting of the mover; and a second magnet disposed in the housing and facing the first magnet, wherein the mover and the guide part are supported by the housing by a repulsive force between the first magnet and the second magnet.

Through the present embodiment, it is possible to provide a prism driving device capable of reducing the size of a product.

However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various forms, and within the scope of the technical idea of the present invention, one or more of the constituent elements may be selectively combined or substituted between embodiments.

In addition, the terms (comprising technical and scientific terms) used in the embodiments of the present invention, unless explicitly defined and described, can be interpreted as a meaning that can be generally understood by a person skilled in the art, and commonly used terms such as terms defined in the dictionary may be interpreted in consideration of the meaning of the context of the related technology.

In addition, terms used in the present specification are for describing embodiments and are not intended to limit the present invention.

In the present specification, the singular form may comprise the plural form unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it may comprise one or more of all combinations that can be combined with A, B, and C.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are merely intended to distinguish the components from other components, and the terms do not limit the nature, order or sequence of the components.

And, when a component is described as being 'connected', 'coupled' or 'interconnected' to another component, the component is not only directly connected, coupled or interconnected to the other component, but may also comprise cases of being 'connected', 'coupled', or 'interconnected' due that another component between that other components.

In addition, when described as being formed or disposed in "on (above)" or "below (under)" of each component, "on (above)" or "below (under)" means that it comprises not only the case where the two components are directly in contact with, but also the case where one or more other components are formed or disposed between the two components. In addition, when expressed as "on (above)" or "below (under)", the meaning of not only an upward direction but also a downward direction based on one component may be comprised.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

<FIG> is a perspective view of a prism driving device according to an embodiment of the present invention. <FIG> is an exploded perspective view of a prism driving device according to an embodiment of the present invention. <FIG> is a plan view of a prism driving device according to an embodiment of the present invention. <FIG> is a perspective view of a partial configuration of a prism driving device according to an embodiment of the present invention. <FIG> is a plan view of a partial configuration of a prism driving device according to an embodiment of the present invention. <FIG> are views illustrating a guide part of a prism driving device according to an embodiment of the present invention. <FIG> is a plan view of a partial configuration of a prism driving device according to an embodiment of the present invention. <FIG> are perspective views of a partial configuration of a prism driving device according to an embodiment of the present invention.

Referring to <FIG>, a prism driving device <NUM> according to an embodiment of the present invention may comprise a housing <NUM>, a guide part <NUM>, a mover <NUM>, a prism <NUM>, a first driving unit <NUM>, a substrate <NUM>, a second driving unit <NUM>, a cover can <NUM>, a sensor <NUM>, and a second magnet <NUM>, but may be implemented except for some of these configurations, and additional configurations are not excluded.

The prism driving device <NUM> may comprise a housing <NUM>. The housing <NUM> may form the outer appearance of the prism driving device <NUM>. The housing <NUM> may be formed in a hexahedral shape with open upper and side surfaces. In the housing <NUM>, a guide part, <NUM>, a mover <NUM>, a prism <NUM>, a first driving unit <NUM>, a substrate <NUM>, a second driving unit <NUM>, a sensor <NUM>, and a second magnet <NUM> may be disposed.

The housing <NUM> may comprise a lower surface <NUM>, a first sidewall <NUM>, a second sidewall <NUM> facing the first sidewall <NUM>, and a third sidewall <NUM> connecting the first sidewall <NUM> and the second sidewall <NUM>.

A substrate <NUM> may be disposed on a lower surface <NUM>, the first sidewall <NUM>, and the second sidewall <NUM> of the housing <NUM>. The second driving unit <NUM> may be disposed on the lower surface <NUM>, the first sidewall <NUM>, and the second sidewall <NUM> of the housing <NUM>. The lower surface <NUM> of the housing <NUM>, the first sidewall <NUM>, and the second sidewall <NUM> may comprise a groove <NUM> in which the second driving unit <NUM> is disposed.

The guide part <NUM> may be disposed between the third sidewall <NUM> of the housing <NUM> and the mover <NUM>. The guide part <NUM> may be coupled to the third sidewall <NUM> of the housing <NUM>. The second protruding portions <NUM> and <NUM> of the second surface <NUM> of the guide part <NUM> may be coupled to the third sidewall <NUM> of the housing <NUM>. The third sidewall <NUM> of the housing <NUM> may comprise a second recess <NUM> in which the second protruding portions <NUM> and <NUM> of the guide part <NUM> are disposed. The second recess <NUM> may be formed to have a shape corresponding to that of the second protruding portions <NUM> and <NUM>. The second recess <NUM> may comprise a plurality of second recesses in which the second protruding portions <NUM> and <NUM> and the fourth protruding unit <NUM> of the third protruding unit <NUM> are respectively disposed. The plurality of second recesses may be disposed to be spaced apart from one another in a vertical direction or a second direction.

The prism driving device <NUM> may comprise a guide part <NUM>. The guide part <NUM> may be disposed between the housing <NUM> and the mover <NUM>. The guide part <NUM> may be disposed between the surfaces facing each other of the mover <NUM> and the housing <NUM>. Specifically, the first surface <NUM> of the guide part <NUM> may face the mover <NUM>, and the second surface <NUM> may face the third sidewall <NUM> of the housing <NUM>.

The guide part <NUM> may be formed in a plate shape. The guide part <NUM> may comprise first protruding portions <NUM> and <NUM> formed by being protruded from the first surface <NUM> toward the mover <NUM>, and the second protruding portions <NUM> and <NUM> formed by being protruded from the second surface <NUM> toward the mover <NUM>. Grooves <NUM> and <NUM> or recesses may be formed at positions where the first protruding portions <NUM> and <NUM> among the second surface <NUM> of the guide part <NUM> are being formed. Grooves <NUM> and <NUM> or recesses may be formed at positions where the second protruding portions <NUM> and <NUM> among the first surface <NUM> of the guide part <NUM> are being formed. Through this, the easiness of manufacturing the first and second protruding portions <NUM>, <NUM>, <NUM>, and <NUM> may be improved. The first protruding portions <NUM> and <NUM> and the second protruding portions <NUM> and <NUM> may not be overlapped in a first axial direction. In an embodiment of the present invention, the first axial direction may mean a traveling direction of light reflected from the prism <NUM>. In addition, in an embodiment of the present invention, the second axis direction may mean a direction perpendicular to the first axial direction and perpendicular to the propagation direction of light being incident on the prism <NUM>.

The first protruding portions <NUM> and <NUM> may be formed to have a shape corresponding to the first recess <NUM> of the mover <NUM>. The first protruding portions <NUM> and <NUM> may be seated in the first recess <NUM> of the mover <NUM>. At least a portion of the first protruding portions <NUM> and <NUM> may be disposed in the first recess <NUM> of the mover <NUM>. The first protruding portions <NUM> and <NUM> may comprise a first protruding unit <NUM> and a second protruding unit <NUM> being spaced apart in a horizontal direction. The first protruding unit <NUM> may be disposed on one side with respect to the center of the first surface <NUM>, and the second protruding unit <NUM> may be disposed on the other side with respect to the center of the first surface <NUM>.

The second protruding portions <NUM> and <NUM> may be formed to have a shape corresponding to the second recess <NUM> of the third sidewall <NUM> of the housing <NUM>. The second protruding portions <NUM> and <NUM> may be seated in the second recess <NUM> of the third sidewall <NUM> of the housing <NUM>. At least a portion of the second protruding portions <NUM> and <NUM> may be disposed in the second recess <NUM> of the third sidewall <NUM> of the housing <NUM>. The second protruding portions <NUM> and <NUM> may comprise a third protruding unit <NUM> and a fourth protruding unit <NUM> that are vertically spaced apart from each other. The third protruding unit <NUM> may be disposed on one side with respect to the center of the second surface <NUM>, and the fourth protruding unit <NUM> may be disposed on the other side with respect to the center of the second surface <NUM>.

Through this, the guide part <NUM> may guide the tilting of the mover <NUM> in a second axis direction. The guide part <NUM> may be formed of a non-magnetic material. For example, the guide part <NUM> may be formed of a stainless (SUS) material. Through this, electromagnetic interference to the first driving unit <NUM> and the second driving unit <NUM> may be prevented.

The prism driving device <NUM> may comprise a mover <NUM>. The mover <NUM> may be disposed in the housing <NUM>. The mover <NUM> may be disposed inside the housing <NUM>. The mover <NUM> may be tiltably supported inside the housing <NUM> by the guide part <NUM>. The mover <NUM> may comprise an accommodating portion in which the prism <NUM> is disposed. The mover <NUM> may be supported by the guide part <NUM> by the repulsive force of the first magnet <NUM> and the second magnet <NUM>. The mover <NUM> may be supported by the housing <NUM> by the repulsive force of the first magnet <NUM> and the second magnet <NUM>.

The mover <NUM> may comprise a lower surface, a first side surface <NUM>, a second side surface <NUM> facing the first side surface <NUM>, and a third side surface <NUM> connecting the first side surface <NUM> and the second side surface <NUM>. The first side surface <NUM> of the mover <NUM> may face the first sidewall <NUM> of the housing <NUM>. A first magnet unit <NUM> may be disposed on the first side surface <NUM> of the mover <NUM>. The second side surface <NUM> of the mover <NUM> may face the second side wall <NUM> of the housing <NUM>. A second magnet unit <NUM> may be disposed on the second side surface <NUM> of the mover <NUM>. A third magnet unit <NUM> may be disposed on a lower surface of the mover <NUM>. A normal line of the first side surface <NUM> may be parallel to a normal line of the second side surface <NUM>. A normal line of the first side surface <NUM> or a normal line of the second side surface <NUM> may be orthogonal to a lower surface of the mover <NUM> or a normal line of the third side surface <NUM>.

The mover <NUM> may comprise a first recess <NUM>. The first recess <NUM> of the mover <NUM> may be formed on the third side surface <NUM> of the mover <NUM>. The first recess <NUM> of the mover <NUM> may be formed at a position corresponding to the first protruding portions <NUM> and <NUM> of the guide part <NUM>. The first protruding portions <NUM> and <NUM> of the guide part <NUM> may be disposed in the first recess <NUM> of the mover <NUM>. At least a portion of the first protruding portions <NUM> and <NUM> of the guide part <NUM> may be disposed in the first recess <NUM> of the mover <NUM>. The first recess <NUM> of the mover <NUM> may comprise: a first protruding unit <NUM> of the first protruding portions <NUM> and <NUM> of the guide part <NUM>; and a plurality of first recesses <NUM> in which the second protruding units <NUM> are respectively disposed. The plurality of first recesses <NUM> may be spaced apart from each other in a horizontal direction, a first direction, or a second axis direction.

Through this, the mover <NUM> may be tiltably disposed inside the housing <NUM>. In addition, the mover <NUM> is tilted with respect to the first axis and may be tilted with respect to the second axis through the above-described guide part <NUM>. The mover <NUM> may be tilted with respect to the first axis by the first magnet <NUM> and the second magnet <NUM>. The mover <NUM> may be tilted in a third direction perpendicular to the first direction by the third magnet <NUM>.

The prism driving device <NUM> may comprise a prism <NUM>. The prism <NUM> may be disposed inside the housing <NUM>. The prism <NUM> may be disposed in the mover <NUM>. The prism <NUM> may have an upper surface and a side surface exposed to the outside. The prism <NUM> may vertically change the movement path of the light by reflecting the light propagating from the upper portion. The prism <NUM> is coupled to the mover <NUM>, and may be tilted with respect to the first axis according to the movement of the mover <NUM>, and may be tilted with respect to the second axis.

The prism driving device <NUM> may comprise a first driving unit <NUM>. The first driving unit <NUM> may be disposed in the mover <NUM>. The first driving unit <NUM> may comprise a first magnet. The first driving unit <NUM> may face the second driving unit <NUM>. The first driving unit <NUM> may tilt the mover <NUM> through electromagnetic interaction with the second driving unit <NUM>.

The first driving unit <NUM> may comprise: a first magnet unit <NUM> disposed on a first side surface <NUM> of the mover <NUM>; a second magnet unit <NUM> disposed on a second side surface <NUM> of the mover <NUM>; and a third magnet unit <NUM> disposed on a lower surface of the mover <NUM>. The first to third magnet units <NUM>, <NUM>, and <NUM> may face the first to third coils <NUM>, <NUM>, and <NUM>, respectively. The first and second magnet units <NUM> and <NUM> may tilt the prism <NUM> and the mover <NUM> with respect to a first axis through electromagnetic interaction with the first and second coils <NUM> and <NUM>. The third magnet unit <NUM> may tilt the prism <NUM> and the mover <NUM> with respect to a second axis through electromagnetic interaction with the third coil <NUM>.

The first driving unit <NUM> may be a first magnet <NUM>. The first magnet <NUM> may be overlapped or may not be overlapped with the guide part <NUM> in an optical axis direction. Specifically, the first magnet <NUM> may be overlapped or may not be overlapped with the central region of the guide part <NUM> in an optical axis direction. In the present invention, the optical axis direction may comprise: a first axis direction in which light is reflected from the prism <NUM>; and a third axis direction in which light is incident to the prism <NUM>. In this case, the first axis, the second axis, and the third axis may be orthogonal to each other.

The prism driving device <NUM> may comprise a yoke (not shown). The yoke may be disposed between the first driving unit <NUM> and the mover <NUM>. The yoke may surround at least a portion of the first driving unit <NUM> except for the surface facing the second driving unit <NUM> to prevent magnetic field leakage.

The prism driving device <NUM> may comprise a substrate <NUM>. The substrate <NUM> may be disposed in the housing <NUM>. The lower surface of the substrate <NUM> may be disposed on a lower surface <NUM> of the housing <NUM>. The substrate <NUM> may be disposed on the first sidewall <NUM> and the second sidewall <NUM> of the housing <NUM>. The second driving unit <NUM> may be disposed on the substrate <NUM>. The substrate <NUM> may be electrically connected to the second driving unit <NUM>. The substrate <NUM> may receive power from the outside and supply current to the second driving unit <NUM>. The substrate <NUM> may be electrically connected to a sensor <NUM>. The substrate <NUM> may supply current to the sensor <NUM>.

At least a part of the substrate may be bent. The substrate <NUM> may comprise first to third surfaces. The first to third surfaces of the substrate <NUM> may be respectively disposed on the lower surface <NUM> of the housing <NUM> and the first and second sidewalls <NUM> and <NUM>.

The substrate <NUM> may comprise a printed circuit board (PCB). The substrate <NUM> may comprise a flexible printed circuit board (FPCB).

The prism driving device <NUM> may comprise a second driving unit <NUM>. The second driving unit <NUM> may be disposed in the housing <NUM>. The second driving unit <NUM> may be disposed inside the housing <NUM>. The second driving unit <NUM> may be disposed in the housing <NUM>. The second driver <NUM> may be disposed on the substrate <NUM>. The second driving unit <NUM> may be electrically connected to the substrate <NUM>. The second driving unit <NUM> may comprise a coil. The second driving unit <NUM> may face the first driving unit <NUM>. The second driving unit <NUM> may tilt the prism <NUM> and the mover <NUM> through electromagnetic interaction with the first driving unit <NUM>.

The second driving unit <NUM> may comprise: a first coil <NUM> being disposed on a first surface of the substrate <NUM> or the first sidewall <NUM> of the housing <NUM>; a second coil <NUM> being disposed on a second surface of the substrate <NUM> or the second sidewall <NUM> of the housing <NUM>; and a third coil <NUM> being disposed on a third surface (lower surface) of the substrate or a lower surface <NUM> of the housing <NUM>. The first coil <NUM> is disposed at a position corresponding to the first magnet unit <NUM>; the second coil <NUM> is disposed at a position corresponding to the second magnet unit <NUM>; and the third coil <NUM> may be disposed at a position corresponding to the third magnet unit <NUM>. The first and second coils <NUM> and <NUM> may tilt the prism <NUM> and the mover <NUM> with respect to the first axis through electromagnetic interaction with the first and second magnet units <NUM> and <NUM>. The third coil <NUM> may tilt the prism <NUM> and the mover <NUM> with respect to the second axis through electromagnetic interaction with the third magnet unit <NUM>.

The prism driving device <NUM> may comprise a cover can <NUM>. The shield can <NUM> may surround the housing <NUM>. The shield can <NUM> may be formed of a metal material. The shield can <NUM> may prevent the electromagnetic field generated inside the prism driving device <NUM> from being emitted to the outside. The shield can <NUM> may prevent electromagnetic interference in the prism driving device <NUM> that may be generated from the outside.

The prism driving device <NUM> may comprise a sensor <NUM>. The sensor <NUM> may be disposed in the second driving unit <NUM>. The sensor <NUM> may face the first driving unit <NUM>. The sensor <NUM> may be electrically connected to the substrate <NUM>. The sensor <NUM> may comprise a Hall sensor. The sensor <NUM> may detect the movement of the first driving unit <NUM>. Through this, feedback control is possible. The sensor <NUM> may comprise first to third sensor units disposed inside the first to third coils <NUM>, <NUM>, and <NUM>, respectively.

The prism driving device <NUM> may comprise a second magnet <NUM>. The second magnet <NUM> may be disposed in the housing <NUM>. The second magnet <NUM> may be disposed in the groove <NUM> formed on an upper surface of the housing <NUM>. The second magnet <NUM> may face the first driving unit <NUM>. At this time, the first driving unit <NUM> may comprise a first magnet. That is, the mover <NUM> may be supported by the housing <NUM> by using the repulsive force between the second magnet <NUM> and the first driving unit <NUM>. The second magnet <NUM> and the first magnet <NUM> may face each other with the same pole. For example, surfaces of the second magnet <NUM> and the first magnet <NUM> facing each other may be magnetized to have the same pole.

The second magnet <NUM> may comprise: a fourth magnet unit <NUM> disposed at a position corresponding to the first magnet unit <NUM>; and a fifth magnet unit <NUM> disposed at a position corresponding to the second magnet unit <NUM>. The length of the fourth and fifth magnet units <NUM> and <NUM> in a first direction may be longer than the length of the first and second magnet units <NUM> and <NUM> in a first direction. The lengths of the fourth and fifth magnet units <NUM> and <NUM> in a second direction perpendicular to the first direction may be formed to be shorter than the lengths of the first and second magnet units <NUM> and <NUM> in a second direction. The fourth and fifth magnet units <NUM> and <NUM> may be disposed higher than the central area of the first and second magnet units <NUM> and <NUM>, respectively. The fourth and fifth magnet units <NUM> and <NUM> may be disposed above the central region of the first and second magnet units <NUM> and <NUM> in a second direction, respectively. Through this, the mover <NUM> can be stably attached to the housing <NUM>.

The fourth magnet unit <NUM> may be disposed on one side of the first magnet unit <NUM>, and the guide part <NUM> may be disposed on the other side of the first magnet unit <NUM>. The fifth magnet unit <NUM> may be disposed on one side of the second magnet unit <NUM>, and the guide part <NUM> may be disposed on the other side of the second magnet unit <NUM>.

According to one embodiment of the present invention, through the simple structure of the guide part <NUM>, the tilting of the prism <NUM> with respect to the first axis and the tilting of the prism <NUM> with respect to the second axis become possible, thereby reducing the size of the product. Here, the tilting angle of the prism <NUM> with respect to the first axis may be within <NUM> degrees, and the tilting angle of the prism <NUM> with respect to the second axis may be within <NUM> degrees.

In addition, according to an embodiment of the present invention, since the mover <NUM> can be supported in the housing <NUM> by the repulsive force between the second magnet <NUM> and the first driving unit <NUM>, the size of the product can be reduced.

Claim 1:
A prism driving device, comprising:
a housing (<NUM>);
a mover (<NUM>) disposed on the housing (<NUM>);
a prism (<NUM>) disposed on the mover (<NUM>);
a first magnet (<NUM>) disposed on the mover (<NUM>);
a coil (<NUM>) disposed on the housing (<NUM>); and
a guide part (<NUM>) disposed between the housing (<NUM>) and the mover (<NUM>) to guide a tilting of the mover (<NUM>),
wherein the first magnet (<NUM>) comprises first and second magnet units (<NUM>, <NUM>),
wherein the coil (<NUM>) comprises first and second coils (<NUM>, <NUM>),
wherein the first and second magnet units (<NUM>, <NUM>) are configured to tilt the prism (<NUM>) and the mover (<NUM>) with respect to a first axis through electromagnetic interaction with the first and second coils (<NUM>, <NUM>),
characterized in that
the prism driving device comprises a second magnet (<NUM>) disposed on the housing (<NUM>) and facing the first magnet (<NUM>),
the second magnet (<NUM>) comprises a fourth magnet unit (<NUM>) disposed at a position corresponding to the first magnet unit (<NUM>), and
the fourth magnet unit (<NUM>) is overlapped with the first magnet unit (<NUM>) in a direction parallel with the first axis.