CN201015008Y - Focusing device - Google Patents

Abstract

The utility model discloses a focusing device, which comprises a bracket, a bearing seat, a magnetic element, a magnetic conduction piece, an elastic element and a magnetic field generating device. The bearing seat is movably sleeved in the bracket and is used for bearing a lens. The magnetic element is arranged on the bearing seat. The magnetic conducting piece is arranged on one side of the bearing seat and is used for attracting the magnetic element. The elastic element is arranged on one side of the support and connected to the bearing seat, and is used for positioning the bearing seat at a first position. The magnetic field generating device is arranged on the bracket in a surrounding way and is used for generating a magnetic field to drive the bearing seat to be positioned at a second position due to the attraction between the magnetic element and the magnetic conduction piece.

Description

Focusing device

technical field

The utility model relates to a focus device, in particular to a focus device with segment focus function.

Background technique

The integrated electronic products that set digital cameras in portable electronic devices (such as mobile phones, personal digital assistants (PDAs), notebook computers, etc.) have become common commodities in daily life. Due to its light, thin and small features, installing a camera with a certain volume inside the portable electronic device is the subject of current mechanism design efforts.

As far as digital cameras are concerned, most of them have a mechanism for adjusting the focal length of the lens because they need to adjust the position of the lens to obtain an appropriate focal length for shooting. The relative position of the sensor and the photosensitive element is used to achieve the purpose of focusing. However, in addition to the difficulty of assembling with the portable electronic device, the complex transmission mechanism will also generate annoying mechanical noises.

In order to overcome the above problems, a two-stage camera lens focusing mechanism was developed. This mechanism uses the interaction of the magnetic field generated by the internal coil group after being energized, the magnet installed on the lens module, and the magnetically conductive element (such as a yoke). To drive the lens module to move back and forth, for example, when the user needs to take a close-up shot, this mechanism uses the magnetic field generated by the energized coil group and the magnet set on the lens module to generate an interactive magnetic force to move the lens module Push away from the photosensitive element until the lens module is attracted by the attraction force between the magnet and the magnetic element so that the lens module is positioned at the close-up focal length. Conversely, when the user wants to take a long-distance shot, the mechanism changes the direction of the energized current to change the direction of the magnetic field generated by the energized coil group, and generates an interactive magnetic force with the magnet set on the lens module so that The lens module moves towards the direction of approaching the photosensitive element until the lens module is attracted by the attraction force between the magnet and another magnetic element, so that the lens module is positioned at the position of the telephoto focal length. It can be seen that whether it is a close-up or a long-distance shooting, the lens module is positioned at the focal length of the close-up or the focal length of the long-range through the attraction between the magnet and the magnetic element. However, if the mechanism is not driven (At this time, the lens module is attracted by the suction force between the magnet and the magnetic conductive element and is located at the position of the telephoto focal length and the coil group is in a non-energized state). Insufficient suction between the magnetic elements causes the lens module to separate from the magnetic element, resulting in the phenomenon that the lens module hits the inside of the mechanism back and forth, which not only increases the probability of particles appearing inside the mechanism, but also makes the sound of the lens module hit back and forth Let the user have a negative impression that the mechanism is damaged.

Utility model content

The purpose of this utility model is to provide a focusing device with a segmented focusing function to solve the above problems.

The purpose of this utility model is achieved by providing a focusing device, which includes a bracket; a bearing seat, which is movably socketed in the bracket, and the bearing base is used to carry a lens; a magnetic A component is arranged on the bearing seat; a magnetic guide is arranged on one side of the bearing seat for attracting the magnetic element; an elastic element is arranged on one side of the bracket and connected to the bearing seat for positioning the bearing seat at a first position; and a magnetic field generating device surrounding the bracket for generating a magnetic field to drive the bearing seat to be positioned at a second position.

The utility model also discloses a focusing device, which includes a bracket; a bearing base, which is movably socketed in the bracket, and the bearing base is used to carry a lens; a magnetic guide is arranged around the bracket. On the bearing seat; a magnetic element is arranged on one side of the bearing seat for attracting the magnetic guide; an elastic element is arranged on one side of the bracket and connected to the bearing seat for positioning the bearing seat at a first position; and a magnetic field generating device, which is arranged around the bearing base, for generating a magnetic field to drive the bearing base to be positioned at a second position due to the attractive force between the magnetic element and the magnetic conductive member .

The utility model has the advantage that it utilizes the arrangement of the elastic element to fix the position of the bearing seat inside the focusing device. When the focusing device is in the non-driven state, the elastic element provides a force so that the bearing seat can be fixed in a certain position, so if the focusing device is in a shaking state, the bearing base can still remain at this position, even if the shaking is too violent and the bearing base is detached At this position, the elastic element can still fix the bearing seat at this position again without the phenomenon that the bearing seat hits the inside of the device back and forth. In this way, the probability of particles inside the device and damage to the internal components of the device can be greatly reduced.

Description of drawings

Fig. 1 is an exploded view of the focusing device of the first embodiment of the present invention;

Fig. 2 is a combined schematic diagram of the focusing device of Fig. 1;

Fig. 3 is a schematic cross-sectional view of the bearing seat in Fig. 1 at the second position along the section line 3-3' in Fig. 2 (without lens);

Fig. 4 is another schematic cross-sectional view of the bearing seat in Fig. 1 at the first position along the section line of Fig. 23-3' (without lens);

Fig. 5 is an exploded view of the focusing device of the second embodiment of the present invention;

Fig. 6 is a schematic cross-sectional view of the focusing device in Fig. 5;

Fig. 7 is an exploded view of the focusing device of the third embodiment of the present invention;

Fig. 8 is a combined schematic diagram of the focusing device in Fig. 7;

Fig. 9 is a schematic cross-sectional view of the bearing seat in Fig. 7 at the fourth position along the section line 9-9' in Fig. 8 (without lens);

Fig. 10 is another schematic cross-sectional view of the bearing seat in Fig. 7 at the third position along the section line 9-9' in Fig. 8 (without lens);

Description of main component symbols:

10, 50, 100 focusing device 12, 102 bracket

14, 54, 104 bearing seat 16, 108 magnetic components

18, 106 Magnetic parts 20, 52, 110 Elastic elements

22, 112 Magnetic field generating device 24, 114 Lens

26, 118 spring 28, 116 bottom plate

5 6 Groove 113 Upper cover

Detailed ways

Please refer to FIG. 1 . FIG. 1 is an exploded view of a focusing device 10 according to a first embodiment of the present invention. The focusing device 10 includes a bracket 12 , a bearing seat 14 , a magnetic element 16 , a magnetically conductive element 18 , an elastic element 20 , and a magnetic field generating device 22 . The bearing seat 14 is movably sleeved in the bracket 12 , and the bearing seat 14 is used for carrying a lens (lens) 24 . The magnetic element 16 is disposed on the bearing seat 14 , as shown in FIG. 1 , the magnetic element 16 may be a plurality of magnets surrounding and disposed on the bearing base 14 . The magnetic element 18 can be a yoke, which is arranged on one side of the supporting seat 14 to attract the magnetic element 16 . In addition, it can also concentrate the magnetic field lines generated by the magnetic field generating device 22 to enhance the magnetic force. The elastic element 20 can be a reed, including a spring 26 and a bottom plate 28 . The spring 26 is installed on the bottom plate 28 and connected to the bearing seat 14. The connection method between the spring 26 and the bearing seat 14 is an existing common technology, that is to say, the spring 26 can be fitted, snapped, hot-melted or glued and other existing connection methods It is connected with the bearing seat 14, and the structure of the spring 26 is not limited to the design shown in FIG. 1 , the design method has been disclosed in many prior art, and will not be repeated here. In addition, as can be seen from FIG. 1 , the bottom plate 28 is connected to the frame 12 in a four-corner locking manner, but it is not limited to this connection method, and the bottom plate 28 can also be connected to the frame 12 in the above-mentioned conventional connection method. The elastic element 20 is disposed on a side of the bracket 12 different from the magnetically conductive element 18, and is used for positioning the bearing seat 14 at a first position. The magnetic field generating device 22 is arranged around the bracket 12, and is used to generate a magnetic field to drive the bearing seat 14 to be positioned at a second position due to the suction force between the magnetic element 16 and the magnetically conductive part 18. The magnetic field generating device 22 can be a Coil, when the coil is energized, it will generate a corresponding magnetic field.

The operation principle of the above-mentioned focusing device 10 will be described in detail here. Please refer to FIG. 1 , FIG. 2 and FIG. 3 . FIG. 2 is a combined schematic view of the focusing device 10 in FIG. 1 , and FIG. 3 is a schematic cross-sectional view of the bearing seat 14 in the second position in FIG. 1 along the 3-3' section line in FIG. 2 . When the direction of the magnetic field generated by the magnetic element 16 and the magnetic field generated by the magnetic field generating device 22 are perpendicular to each other, the magnetic force it can generate is the maximum, and then it can be seen from Figure 3 that the side of the magnetic element 16 near the bearing seat 14 is the magnetic south pole S, the other side is the magnetic north pole N, so the direction of the magnetic field lines generated by the magnetic element 16 is radially outwardly emitted by the bearing seat 14, so when the user needs to take a close-up shot, the magnetic field generating device 22 will be reversed due to the reverse direction of the coil. The clockwise direction is energized to generate a magnetic field perpendicular to the magnetic field of the magnetic element 16 (the direction of the magnetic force lines of this magnetic field is upward emission). (not shown in Fig. 3) and the magnetic element 16 that is arranged on it is pulled up by the magnetic force that the magnetic field of magnetic element 16 and the magnetic field generating device 22 generate under the vertical interaction, spring 26 will be due to the bearing seat The connection of 14 is then stretched (as shown in Figure 3), and then a downward pulling force is generated to pull the bearing seat 14, so the magnetic field generated by the magnetic field of the magnetic element 16 and the magnetic field of the magnetic field generating device 22 under the vertical interaction It must be adjusted to overcome the tension of the spring 26, so as to drive the carrier 14 to move upwards, and finally the lens 24 carried by the carrier 14 will be positioned at the close-up focal length due to the suction force between the magnetic element 16 and the magnetic guide 18 position (this second position as shown in Figure 3). Please continue to refer to FIG. 4. FIG. 4 is another schematic cross-sectional view of the bearing seat 14 in FIG. 1 at the first position along the 3-3' section line in FIG. Focusing device 10 then can provide the electric current that flows in the clockwise direction so that magnetic field generator 22 produces a magnetic field perpendicular to the magnetic field of magnetic element 16 (the direction of the magnetic force line of this magnetic field is downward emission) because of coil energization, so that , the magnetic force generated by the magnetic field of the magnetic element 16 and the magnetic field of the magnetic field generating device 22 under the vertical interaction and the pulling force provided by the spring 26 will overcome the attraction between the magnetic element 16 and the magnetic guide 18, and drive the bearing seat 14 returns downward to the position of the telephoto focal length (the first position as shown in FIG. 4 ), and now the bearing seat 14 will be positioned at the telephoto focal length position due to the tension provided by the spring 26 . In addition, as can be seen from FIGS. 3 and 4 , the spring 26 is in an unstressed original state when the bearing seat 14 is in the first position, and is in a tensioned state when the bearing seat 14 is in the second position. Therefore, when the bearing base 14 is pulled back from the second position to the first position, since there is an elastic restoring force provided by the spring 26 at the same time, the required magnetic force can be relatively small, which means that the required current can be relatively small. Small.

It is worth mentioning that the arrangement of the elastic element 20 is not limited to the above-mentioned positions, the elastic element 20 can also be arranged between the bracket 12 and the magnetic guide 18, and the connection method is also as described above, the difference is that the elastic element 18 provides The force will be changed from pulling force to pushing force. In this way, when the user needs to take a close-up shot, the magnetic force generated by the interaction between the magnetic field of the magnetic element 16 and the magnetic field generating device 22 will overcome the force provided by the spring 26. Pushing force, so that the lens 24 carried by the carrier seat 14 is positioned at the position of the close-up focal length (the second position shown in FIG. 3 ) due to the attraction force between the magnetic element 16 and the magnetic member 18 . And when the user needs to take a long-distance shot, along with the opposite magnetic field generated by the magnetic field generating device 22 due to energization, the magnetic force generated by the magnetic field of the magnetic element 16 and the magnetic field of the magnetic field generating device 22 under the vertical interaction and the magnetic force generated by the spring 26 The thrust provided will overcome the suction force between the magnetic element 16 and the magnetic guide 18, and push the bearing seat 14 back to the position of the telephoto focal length. Take the position of the focal length (the first position as shown in FIG. 4 ).

Then please refer to Fig. 5. Fig. 5 is an exploded view of a focusing device 50 of the second embodiment of the present invention. The difference between the focusing device 50 and the focusing device 10 of the first embodiment is only the structure and position of the elastic element. The elements described in the embodiment and the elements described in the first embodiment are numbered the same, indicating that they have the same function or relative position, and will not be repeated here. The elastic element 52 can be a spring, one end of which is connected to the magnetic conducting part 18, and the other end is connected to the bearing seat 54. The connection mode of the elastic element 52, the magnetic conducting part 18 and the bearing seat 54 is an existing common technology, that is, That is to say, the elastic element 52 can be connected with the magnetic-conducting member 18 and the bearing seat 54 by existing connection methods such as fitting, clamping, heat-melting or gluing. The elastic element 52 is disposed between the bracket 12 and the magnetic guide 18 . A groove 56 is provided on the supporting seat 54, and the groove 56 is used to accommodate the elastic element 52. Please refer to FIG. 6, which is a schematic cross-sectional view of the focusing device 50 in FIG. The magnetic force generated by the magnetic field of the element 16 and the magnetic field of the magnetic field generating device 22 under the vertical interaction overcomes the thrust of the elastic element 52, so that the lens 24 carried by the bearing seat 54 is due to the attraction between the magnetic element 16 and the magnetic guide 18. When positioned at the position of the close-up focal length, the groove 56 can provide a space to accommodate the compressed elastic element 52, so that the lens 24 carried by the carrier seat 54 can be smoothly positioned at the close-up focal length without being blocked by the elastic element 52 Location. In addition, the arrangement of the elastic element described in the first embodiment can also be applied to the arrangement of the elastic element 52, that is to say, the elastic element 52 can be arranged on the side of the bracket 12 different from the magnetic guide 18, and the elastic element One end of the elastic element 52 is connected to the bracket 12 , and the other end of the elastic element 52 is connected to the bearing seat 54 .

Please refer to FIG. 7 . FIG. 7 is an exploded view of a focusing device 100 according to a third embodiment of the present invention. The difference between the focusing device 100 and the focusing device 10 of the first embodiment lies in the arrangement positions of the magnetic element, the magnetic field generating device and the magnetic conducting member. The focusing device 100 includes a bracket 102 , a bearing base 104 , a magnetic element 106 , a magnetic element 108 , an elastic element 110 , a magnetic field generating device 112 , and an upper cover 113 . The carrying seat 104 is movably sleeved in the bracket 102 , and the carrying seat 104 is used for carrying a lens 114 . The magnetically conductive part 106 can be a yoke, which is arranged around the supporting seat 104 . The magnetically conductive part 106 can concentrate the magnetic field lines generated by the magnetic field generating device 112 to enhance the magnetic force. The magnetic element 108 is disposed on one side of the bearing base 104 for attracting the magnetically conductive element 106 . The elastic element 110 can be a reed, including a bottom plate 116 and a spring 118 . The spring 118 is installed on the bottom plate 116 and connected to the bearing seat 104. The connection method between the spring 118 and the bearing seat 104 is a common technology in the prior art. It is connected with the bearing seat 104, and the structure of the spring 118 is also not limited to the design shown in FIG. 7 , the design method has been disclosed in many prior art, and will not be repeated here. In addition, as can be seen from FIG. 7 , the bottom plate 116 is connected to the frame 102 in a four-corner locking manner, but it is not limited to this connection method, and the bottom plate 116 can also be connected to the frame 102 in the above-mentioned conventional connection method. The elastic element 110 is disposed on a side of the bracket 102 different from the magnetic element 108 for positioning the supporting seat 104 at a third position. The magnetic field generating device 112 is disposed around the bearing base 104 for generating a magnetic field to drive the bearing base 104 to be positioned at a fourth position due to the attraction force between the magnetic element 108 and the magnetic conductive element 106 . The magnetic field generating device 112 can be a coil, and the corresponding magnetic field will be generated when the coil is energized. The upper cover 113 is disposed on one side of the magnetic element 108 for combining with the bracket 102 to jointly cover the internal elements of the focusing device 100 .

The operation principle of the focusing device 100 described above will be described in detail here. Please refer to FIG. 7 , FIG. 8 and FIG. 9 . FIG. 8 is a combined schematic view of the focusing device 100 in FIG. 7 , and FIG. 9 is a schematic cross-sectional view of the bearing seat 104 in the fourth position in FIG. 7 along the section line 9-9' in FIG. 8 . When the direction of the magnetic field generated by the magnetic element 108 and the magnetic field generated by the magnetic field generating device 112 are perpendicular to each other, the magnetic force it can generate is the maximum. Then, as can be seen from FIG. S), the outer side is the magnetic north pole (N), so the direction of the magnetic field lines generated by the magnetic element 108 is radially outwardly emitted by the bearing seat 104, so when the user needs to take a close-up shot, the magnetic field generating device 112 will be caused by the coil Electricity is applied in the counterclockwise direction to generate a magnetic field perpendicular to the magnetic field of the magnetic element 108 (the direction of the magnetic force lines of this magnetic field is upward emission). 114 (not shown in FIG. 9 ) and the magnetic element 108 disposed thereon are pulled up by the magnetic force generated by the magnetic field of the magnetic element 108 and the magnetic field generating device 112 under the vertical interaction, the spring 118 will be due to the contact with the bearing seat 104 is connected and then stretched (as shown in Figure 9), and then a downward pulling force is generated to pull the bearing seat 104, so the magnetic field generated by the magnetic field of the magnetic element 108 and the magnetic field of the magnetic field generating device 112 under the vertical interaction It must be adjusted to overcome the tension of the spring 118, so as to drive the carrier 104 to move upwards, and finally the lens 114 carried by the carrier 104 will be positioned at the close-up focal length due to the suction force between the magnetic element 108 and the magnetic guide 106 position (the fourth position as shown in Figure 9). Please continue to refer to FIG. 10. FIG. 10 is another schematic cross-sectional view of the bearing base 104 in FIG. 7 at the third position along the section line 9-9' in FIG. The focusing device 100 will provide a clockwise current so that the magnetic field generating device 112 will generate a magnetic field perpendicular to the magnetic field of the magnetic element 108 due to the electrification of the coil (the direction of the magnetic field line of this magnetic field is downward emission), so that, The magnetic force generated by the interaction between the magnetic field of the magnetic element 108 and the magnetic field of the magnetic field generating device 112 and the pulling force provided by the spring 118 will overcome the attractive force between the magnetic element 108 and the magnetic conductive member 106, and push the bearing seat 104 downward. Returning to the position of the telephoto focal length (the third position shown in FIG. 10 ), at this moment, the bearing base 104 will be positioned at the telephoto focal length position due to the tension provided by the spring 118 . In addition, it can be seen from FIG. 9 and FIG. 10 that the spring 118 is in an unstressed original state when the bearing seat 104 is at the third position, and when the bearing seat 104 is at the fourth position, the spring 118 is in a tensioned state. Therefore, when the bearing seat 104 is pulled back from the fourth position to the third position, due to the elastic restoring force provided by the spring 118 at the same time, the required magnetic force can be relatively small, which means that the required current can be relatively small. Small.

It is worth mentioning that the changes in the position and structure of the elastic element mentioned in the above-mentioned first and second embodiments can be applied to the third embodiment, which will not be repeated here. In addition, the magnetic pole direction of the magnetic element in all the embodiments is not limited to the above-mentioned arrangement. For example, the side of the magnetic element close to the bearing seat can be changed to the magnetic north pole N, and the other side is the magnetic south pole S, and The direction of the magnetic field generated by the magnetic field generating device also needs to be changed accordingly to meet the requirements.

Compared with the magnetic adsorption method in the prior art, the utility model uses elastic elements to fix the position of the bearing seat inside the focusing device. When the focusing device is in a non-driven state, the elastic element provides a force so that the bearing seat can be fixed at the first position as shown in Figure 4, so if the focusing device is in a shaking state, the bearing seat can still remain at the first position, even if The shaking is too violent and the bearing base is separated from the first position. At this time, the elastic element can still fix the bearing base at the first position again without the phenomenon that the bearing base hits the inside of the device back and forth. In this way, the inside of the device can be greatly reduced. Chance of particulates and damage to internal components of the device.

Claims (21)

1. A focusing device, characterized in that it includes: a bracket; a bearing seat, which is movably socketed in the bracket, and the bearing base is used to carry a lens; a magnetic element, arranged on the On the bearing seat; a magnetic guide, arranged on one side of the bearing seat, for attracting the magnetic element; an elastic element, arranged on one side of the bracket and connected to the bearing seat, for positioning the bearing seat at a first position; and a magnetic field generating device, which is disposed around the bracket, and is used to generate a magnetic field to drive the bearing seat to be positioned at a second position due to the attraction force between the magnetic element and the magnetic conductive part. 2 . The focusing device as claimed in claim 1 , wherein the elastic element comprises: a bottom plate connected to the bracket; and a spring installed on the bottom plate and connected to the supporting base. 3 . 3 . The focusing device according to claim 1 , wherein the elastic element is a spring, one end of the spring is connected to the bracket, and the other end of the spring is connected to the bearing seat. 4 . 4 . The focusing device according to claim 1 , wherein the elastic element is a spring, one end of the spring is connected to the magnetic guide member, and the other end of the spring is connected to the supporting base. 5. The focusing device as claimed in claim 4, wherein a groove for accommodating the spring is provided on the supporting seat. 6 . The focusing device according to claim 1 , wherein the elastic element is disposed on a side of the bracket different from the magnetic conductive member. 7 . 7 . The focusing device according to claim 1 , wherein the elastic element is disposed between the magnetic conductive member and the bracket. 8. The focusing device as claimed in claim 1, wherein the magnetically conductive member is a yoke. 9. The focusing device as claimed in claim 1, wherein the magnetic field generating device is a coil. 10 . The focusing device according to claim 1 , wherein the direction of the magnetic force lines generated by the magnetic field generating device is perpendicular to the direction of the magnetic force lines generated by the magnetic element. 11 . 11. A focusing device, characterized in that it includes: a bracket; a bearing seat, which is movably socketed in the bracket, and the bearing base is used to carry a lens; a magnetically conductive part, arranged around On the bearing seat; a magnetic element is arranged on one side of the bearing seat for attracting the magnetic guide; an elastic element is arranged on one side of the bracket and connected to the bearing seat for the bearing The base is positioned at a first position; and a magnetic field generating device is disposed around the bearing base and is used to generate a magnetic field to drive the bearing base to be positioned at a first position due to the attraction force between the magnetic element and the magnetic permeable member. Second position. 12 . The focusing device as claimed in claim 11 , wherein the elastic element comprises: a bottom plate connected to the bracket; and a spring installed on the bottom plate and connected to the supporting base. 13 . 13 . The focusing device according to claim 11 , wherein the elastic element is a spring, one end of the spring is connected to the bracket, and the other end of the spring is connected to the supporting base. 14 . 14. The focusing device according to claim 11, wherein the elastic element is a spring, one end of the spring is connected to the magnetic element, and the other end of the spring is connected to the supporting base. 15. The focusing device as claimed in claim 14, wherein a groove for accommodating the spring is provided on the supporting base. 16. The focusing device as claimed in claim 11, wherein the elastic element is disposed on a side of the bracket different from the magnetic element. 17. The focusing device as claimed in claim 11, wherein the elastic element is disposed between the magnetic element and the bracket. 18. The focusing device according to claim 11, wherein the magnetically conductive member is a yoke. 19. The focusing device as claimed in claim 11, wherein the magnetic field generating device is a coil. 20. The focusing device as claimed in claim 11, wherein the direction of the magnetic flux generated by the magnetic field generating device is perpendicular to the direction of the magnetic flux generated by the magnetic element. 21. The focusing device as claimed in claim 11, further comprising an upper cover disposed on one side of the magnetic element.

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