Projector and optical module including extending wire

An optical module including a transparent component and at least one coil device is provided. The at least one coil device is connected to the transparent component and includes a main body and at least one extending wire. The at least one extending wire is extended out from the main body, the at least one coil device is adapted to be driven by a magnetic force to vibrate along at least one rotation axis, and a length of the at least one extending wire is in positive correlation with a width of the transparent component along a direction. The direction is perpendicular to the at least one rotation axis and perpendicular to an optical axis of the transparent component. In addition, a projector having the optical module is also provided.

BACKGROUND

Technical Field

The invention relates to a display device and an optical module thereof, and particularly relates to a projector and an optical module thereof.

Description of Related Art

The projector is a display device for generating a large screen. The imaging principle of a projector includes converting an illumination beam generated by a light source into an image beam via a light valve, and then projecting the image beam on a screen or a wall via a projection lens.

To increase the pixel quality of the projection screen, a pixel offset device is disposed between the light valve and the projection lens of some projectors. In the case of a moving-coil-type pixel offset device, a coil is vibrated by a variation between the coil and a magnet, so as to drive a transparent component to be vibrated. However, due to the vibration of the coil, wires extended out from the coil are easily to be fractured owing to metal fatigue.

SUMMARY

The invention provides a projector and an optical module that may prevent wires extended out from a vibrating coil from being fractured.

Other objects and advantages of the invention can be further understood from the technical features disclosed in the invention.

To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides a projector including a light source, a light valve, an optical module, and a projection lens. The light source is adapted to provide an illumination beam. The light valve is located at a transmitting path of the illumination beam and adapted to convert the illumination beam into an image beam. The optical module includes a transparent component and at least one coil device. The transparent component is located at a transmitting path of the image beam. The at least one coil device is connected to the transparent component and includes a main body and at least one extending wire. The at least one extending wire is extended out from the main body, the at least one coil device is adapted to be driven by a magnetic force to vibrate along at least one rotation axis, and a length of the at least one extending wire is in positive correlation with a width of the transparent component along a direction. The direction is perpendicular to the at least one rotation axis and perpendicular to an optical axis of the transparent component. The projection lens is located at the transmitting path of the image beam and adapted to project the image beam out of the projector.

To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides an optical module including a transparent component and at least one coil device. The at least one coil device is connected to the transparent component and includes a main body and at least one extending wire. The at least one extending wire is extended out from the main body, the at least one coil device is adapted to be driven by a magnetic force to vibrate along at least one rotation axis, and a length of the at least one extending wire is in positive correlation with a width of the transparent component along a direction. The direction is perpendicular to the at least one rotation axis and perpendicular to an optical axis of the transparent component.

To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides a projector including a light source, a light valve, an optical module, and a projection lens. The light source is adapted to provide an illumination beam. The light valve is located at a transmitting path of the illumination beam and adapted to convert the illumination beam into an image beam. The optical module includes a transparent component and at least one coil device. The at least one coil device is connected to the transparent component and includes a main body and at least one extending wire. The at least one extending wire is extended out from a position on the main body, the at least one coil device is adapted to be driven by a magnetic force to vibrate along at least one rotation axis. In a direction, a distance between the at least one rotation axis and the position on the main body is equal to or less than quarter a width of the main body, wherein the direction is perpendicular to the at least one rotation axis and perpendicular to an optical axis of the transparent component. The projection lens is located at the transmitting path of the image beam and adapted to project the image beam out of the projector.

To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides an optical module including a transparent component and at least one coil device. The at least one coil device is connected to the transparent component and includes a main body and at least one extending wire. The at least one extending wire is extended out from a position on the main body, the at least one coil device is adapted to be driven by a magnetic force to vibrate along at least one rotation axis. In a direction, a distance between the at least one rotation axis and the position on the main body is equal to or less than quarter a width of the main body, wherein the direction is perpendicular to the at least one rotation axis and perpendicular to an optical axis of the transparent component.

Based on the above, the embodiments of the invention have at least one of the following advantages or efficacies. In the optical module, the larger the width of the transparent component is, the larger the length of the extending wire of the coil device is. Hence, even if the maximum displacement of the transparent component is large due to a large width thereof, the extending wire has a sufficient length to provide an excellent vibration buffering ability, so as to prevent the extending wire from being fractured. In addition, in the coil device, the position (at which the extending wire is extended out from the main body) is located near the rotation axis of the coil device, and the displacement of the coil device at the position is small by doing this, such that the extending wire is prevented from being fatigued or/and fractured.

DESCRIPTION OF THE EMBODIMENTS

FIG. 1is a schematic of a projector of an embodiment of the invention. Referring toFIG. 1, a projector100of the embodiment includes a light source110, a light valve120, and a projection lens130. The light source110is adapted to provide an illumination beam L1, and the illumination beam L1is adapted to be guided to the light valve120. The light valve120is, for instance, a digital micro-mirror device (DMD) located/disposed at/on the transmitting path of the illumination beam L1, and adapted to convert the illumination beam L1into an image beam L2. In some embodiment, the light valve120may be liquid crystal display (LCD) panel or liquid crystal on silicon (LCoS), but the invention is not limited thereto. The light valve120is adapted to reflect the image beam L2to the projection lens130. The projection lens130is located/disposed at/on the transmitting path of the image beam L2, and is adapted to project the image beam L2out of/from the projector100.

FIG. 2is a top view of an optical module of the projector ofFIG. 1. Referring toFIG. 2, the projector100(as shown inFIG. 1) further includes an optical module140. The optical module140includes a transparent component142and at least one coil device144(four coil devices144are shown inFIG. 2for example). In one embodiment, the transparent component142may be disposed between the light valve120(as shown inFIG. 1) and the lens130(as shown inFIG. 1), but the invention is not limited thereto. In one embodiment, the transparent component142may be disposed between the light source110(as shown inFIG. 1) and the light valve120(as shown inFIG. 1), but the invention is not limited thereto. The transparent component142is located at/on the transmitting path of the image beam L2(as shown inFIG. 1). The optical module140further includes at least one magnetic component146(four magnetic components146are shown inFIG. 2for example). The magnetic components146are aligned to the coil devices144respectively. The coil devices144are connected to the transparent component142, and each coil device144includes a main body144aand at least one extending wire144b(two extending wires144bfor example). In the embodiment, each of the extending wires144bis extended out from a position P (two of the positions P are labeled inFIG. 2for example) on the corresponding main body144a. In one embodiment, the position P may be the center position of the main body144a, but the invention is not limited thereto. In one embodiment, the position P may be the position near the center position of the main body144a, but the invention is not limited thereto.

In the embodiment, two of the coil devices144(e.g. the coil device144at the upper side and the coil device144at the lower side inFIG. 2) are adapted to be driven by magnetic forces generated between the corresponding magnetic components146and the two coil devices144to vibrate along a rotation axis A1, and another two of the coil devices144(e.g. the coil device144at the right side and the coil device144at the left side inFIG. 2) are adapted to be driven by magnetic forces generated between the corresponding magnetic components146and the two coil devices144to vibrate along a rotation axis A2perpendicular to the rotation axis A1. The transparent component142is adapted to be driven (e.g. to be vibrated) by the coil devices144. By doing this, the image beam L2passing through the transparent component142offsets correspondingly, such that the pixels offset back and forth to increase the resolution of the projection image.

In the embodiment, a length of each of two of the extending wires144b(e.g. the coil device144at the right side or/and the coil device144at the left side inFIG. 2) is in positive correlation with a width W1of the transparent component142along a direction D1, wherein the direction D1is perpendicular to the rotation axis A1and perpendicular to an optical axis OA of the transparent component142. Similarly, a length of each of another two of the extending wires144b(e.g. the coil device144at the upper side or/and the coil device144at the lower side inFIG. 2) is in positive correlation with a width W2of the transparent component142along a direction D2, wherein the direction D2is perpendicular to the rotation axis A2and perpendicular to an optical axis OA of the transparent component142. That is, the larger the width of the transparent component142is, the larger each length of the extending wires144bof the coil device140is. Hence, even if the maximum displacement of the transparent component142is large due to a large width thereof, the extending wires144bhave sufficient lengths to provide excellent vibration buffering abilities, so as to prevent the extending wires144bfrom being fractured.

In the embodiment, the length of the extending wire144bis, for example, larger than fifty times a maximum displacement (vibration displacement) of the transparent component142. However, the invention is not limited thereto. In the embodiment, a direction of the vibration displacement of the transparent component142is not parallel to the direction D1/direction D2. In the embodiment, a direction of the vibration displacement of the transparent component142is substantially perpendicular to the direction D1and the direction D2. In the embodiment, the vibration displacement is, for example, 60 μm or 70 μm, but the invention is not limited thereto. In the embodiment, the length of the extending wire144bis, for example, 15 mm, but the invention is not limited thereto.

In addition, in the direction D1, a distance d1between the rotation axis A1and the position P on the corresponding main body144ais equal to or less than quarter a width W3of the main body144a. Similarly, in the direction D2, a distance d2between the rotation axis A2and the position P on the corresponding main body144ais equal to or less than quarter a width W4of the main body144a. That is, in each of the coil devices144, the position P (at which the extending wire144bis extended out from the main body144a) is located near the rotation axis (e.g. rotation axis A1/A2) of the coil device144, and the displacement of the coil device144at the position P is small by doing this, such that the extending wire144bis prevented from being fatigued or/and fractured, therefore the operating/working duration time of the extending wire144bmay be increased. In the embodiment, the displacement of the coil device144at the position P is equal to half a width W3or/and width W4of the main body144a.

In the embodiment, the distance d1between the rotation axis A1and the position P on the main body144ais equal to or less than one-eighth the width W3, and the distance d2between the rotation axis A2and the position P on the main body144ais equal to or less than one-eighth the width W4. However, the invention is not limited thereto.

FIG. 3is a top view of a circuit board of the optical module inFIG. 2. Referring toFIG. 2andFIG. 3, the optical module140further includes a circuit board148. The circuit board148has at least one notche148a(four notches148aare shown inFIG. 2andFIG. 3for example), the notches148aare aligned to the coil devices144respectively, and each of the extending wires144bis extended through the corresponding notch148aand connected to the circuit board148. Accordingly, each of the extending wires144bis arranged well by the corresponding notch148a, so as to prevent the extending wires144bfrom being twisted unexpectedly while the coil devices144are vibrated, and to prevent the extending wires144band the circuit board148from being scraped with each other unexpectedly to further avoid breaking the coil devices144.

In the embodiment, in the direction D1, a width W5of each of the notches148a(e.g. the notch148aat the right side or/and the notch148aat the left side inFIG. 2andFIG. 3) is equal to or less than half a width W3of the main body144a. Similarly, in the direction D2, a width W6of each of the notches148a(e.g. the notch148aat the upper side or/and the notch148aat the lower side inFIG. 2andFIG. 3) is equal to or less than half a width W4of the main body144a. However, the invention is not limited thereto.

Referring toFIG. 2, the optical module140of the embodiment further includes a first frame141, a second frame143, and a base145for assembling the coil devices144and the transparent component142. Particularly, the transparent component142and two of the coil devices144are disposed on the first frame141, the first frame141and the second frame143are pivoted to each other along the rotation axis A2, another two of the coil devices144are disposed on the second frame143, and the second frame143is pivoted to the base145along the rotation axis A1. Accordingly, when the magnetic force is generated between each of the coil devices144and the corresponding magnetic component146, the two coil devices144disposed on the second frame143are able to vibrate along the rotation axis A1through the pivot between the base145and the second frame143, and the two coil devices144disposed on the first frame141are able to vibrate along the rotation axis A2through the pivot between the first frame141and the second frame143.

In the embodiment, the optical module140may include glues, the glues are adhered on one end or two ends of each of the extending wires144b, so as to further prevent the extending wires144bfrom being fractured at the ends thereof.

FIG. 4is a top view of a coil device of another embodiment of the invention. The difference between the coil device144′ inFIG. 4and the coil device144inFIG. 2is that, each of the extending wires144b′ is a spiral wire. In other embodiments, the extending wires could be other types, such as stranded wires (not shown), etc., and the invention is not limited thereto. Thus, the actual length of each of the extending wires144b′ is able to be increased through different designs.

In summary, the embodiments of the invention have at least one of the following advantages or efficacies. In the optical module, the larger the width of the transparent component is, the larger the length of the extending wire of the coil device is. Hence, even if the maximum displacement of the transparent component is large due to a large width thereof, the extending wire has a sufficient length to provide an excellent vibration buffering ability, so as to prevent the extending wire from being fractured. In addition, in the coil device, the position (at which the extending wire is extended out from the main body) is located near the rotation axis of the coil device, and the displacement of the coil device at the position is small by doing this, such that the extending wire is prevented from being fatigued or/and fractured.