TWI822688B - Main barrel - Google Patents

Abstract

A main barrel includes a cell, a guide rod and a magnet. The guide rod is disposed on the cell and has paramagnetic properties. The magnet is disposed on the cell.

Description

Lens tube

The present invention relates to a lens barrel and a manufacturing method thereof, and in particular, to a lens barrel with a magnet and a manufacturing method thereof.

The imaging device contains several components. Due to factors such as machining tolerances, assembly tolerances or low-temperature operation, there is inevitably clearance between these components. In this way, during the relative movement of the components of the imaging device, such as during the image zooming process (zooming), the camera image displayed on the screen of the imaging device will shake. Based on this, there is a need to propose a new lens barrel that can improve the aforementioned problems.

The present invention relates to a lens barrel and a manufacturing method thereof, which can improve the aforementioned problems.

According to an embodiment of the present invention, a lens barrel is provided. The lens barrel includes a sleeve, a first guide rod and a magnet. The first guide rod is disposed on the sleeve and has paramagnetic properties. The magnet is arranged on the sleeve. In this way, the sleeve and the first guide rod can move relative to each other smoothly.

According to another embodiment of the present invention, a lens barrel is provided. The lens barrel includes a sleeve, a first guide rod and a magnet. The first guide rod is arranged on the sleeve. Magnet configured in sleeve superior. There is a shortest distance between the magnet and the first guide rod, some blocks of the sleeve are located within the shortest distance, and the magnetic lines of force between the magnet and the first guide bar pass through some blocks. In this way, the sleeve and the first guide rod can move relative to each other smoothly

According to another embodiment of the present invention, a lens barrel is provided. The lens barrel includes a sleeve, a first guide rod and an elastic element. The first guide rod is arranged on the sleeve. The elastic element connects the sleeve and the first guide rod. In this way, the sleeve and the first guide rod can move relative to each other smoothly.

According to another embodiment of the present invention, a method for manufacturing a lens barrel is provided. The manufacturing method includes the following steps. Arrange the magnet on the sleeve; and install the first guide rod and the sleeve in the lens barrel, wherein the first guide rod has paramagnetism.

In order to have a better understanding of the above and other aspects of the present invention, examples are given below and are described in detail with reference to the accompanying drawings:

100, 200: Lens barrel

110:Sleeve

110r: Accommodation tank

111:Sleeve body

111s: End face

112:Slider

112a1: first through hole

112a2: Second through hole

112b: Lower surface

112s: medial surface

112u: Upper surface

112w1, 112w2: inner wall

120:First guide rod

130:Magnet

130s: Configuration surface

140:Second guide rod

150:drive

160:Third guide rod

170:Sleeve

230: Elastic element

231:Butt part

232: Flexible Department

2321:First end

2322:Second end

AC1, AC2: axis

C1, AC3: center

C2: middle position

c: Clearance

F11, F12: contact force

F21: elastic force

F22: Reaction force

L1: connection

M1: Partial block

S1: shortest distance

T1: Arrival point

Figures 1 and 2 are schematic diagrams of a lens barrel according to an embodiment of the present invention.

Figure 3 shows the front view of the lens barrel in Figure 1 looking towards the -Z direction.

Figure 4 shows a cross-sectional view of the lens barrel of Figure 3 along the direction 4-4'.

Figure 5 shows a cross-sectional view of the lens barrel in Figure 3 along the direction 5-5'.

Figure 6 is a schematic diagram of a lens barrel according to another embodiment of the present invention.

Figure 7 shows a cross-sectional view of the lens barrel of Figure 6 along the direction 7-7'.

Please refer to Figures 1 to 3. Figures 1 and 2 illustrate a schematic diagram of a main barrel 100 according to an embodiment of the present invention, and Figure 3 illustrates the main barrel 100 of Figure 1 viewed in the -Z direction. front view.

The lens barrel 100 can be applied to an imaging device, such as a video camera or a camera. It can also be used in projection devices such as projectors or home theaters. The lens barrel 100 includes a cell 110 , a first guide rod 120 , a magnet 130 , a second guide rod 140 , a driver 150 , a third guide rod 160 and a sleeve 170 . In addition, the lens barrel 100 may further include a housing (not shown), the sleeve 110, the first guide rod 120, the magnet 130, the second guide rod 140, the driver 150, the third guide rod 160 and the sleeve 170 may be configured inside the shell.

The first guide rod 120 is provided on the sleeve 110 and the magnet 130 is arranged on the sleeve 110 . The first guide rod 120 has paramagnetic properties, so a magnetic attraction force can be generated between the magnet 130 and the first guide rod 120 . In this way, as shown in FIG. 3 , under the action of magnetic attraction, the first guide rod 120 abuts the sleeve 110 . During the sliding process of the sleeve 110 relative to the first guide rod 120 (such as the image zooming process), the first guide rod 120 and the sleeve 110 remain in contact (the clearance at the contact point is 0), which can reduce or even avoid The camera screen shakes.

As shown in Figure 3, there is a non-air medium between the first guide rod 120 and the magnet 130, such as a partial block M1 of the sleeve 110 (indicated by a dotted line). The partial block M1 is, for example, a partial entity of the sleeve 110. block. Specifically, there is a shortest distance S1 between the magnet 130 and the first guide rod 120 , the partial block M1 of the sleeve 110 is located within the shortest distance S1 , and the magnetic force between the magnet 130 and the first guide rod 120 is A line (not shown) passes through part of block M1.

As shown in Figures 1 and 2, the second guide rod 140 is connected to the sleeve 110. The driver 150 is connected to the second guide rod 140 and can drive the second guide rod 140 to rotate, so as to drive the sleeve 110 to move along the axial direction of the sleeve 110, such as moving along the Z direction. The driver 150 is, for example, a motor. In another embodiment, the device for driving the sleeve 110 may be a voice coil motor, a stepper motor, a piezoelectric element, a magnetic levitation induction element, an electromagnet or other suitable elements. The second guide rod 140 may be a lead screw. In addition, the third guide rod 160 is provided on the sleeve 110 . The first guide rod 120 and the third guide rod 160 can guide the sleeve 110 to move along the axial direction of the sleeve 110 . Although not shown in the figure, at least one lens is disposed inside the sleeve 110 . The light from the object side is incident on the image sensing element (not shown) through the at least one lens, so that the image sensing element senses the image of the object on the object side.

In this embodiment, as shown in Figures 1 and 2, the sleeve 110 is a moving sleeve, and the sleeve 170 is a fixed sleeve. Although not shown, at least one lens may be disposed inside the sleeve 170 . The light from the object side is incident on the image sensing element (not shown) through the at least one lens, so that the image sensing element senses the image of the object on the object side. When the lens barrel 100 is used in an imaging device, the object side can be the image magnification side, and the image side can be where the image sensing element is located; when the lens barrel 100 is used in a projection device, the object side can be the image reduction side. , such as the light valve position side, and the image side can be the image magnification side, such as a screen.

As shown in FIG. 1 , the sleeve 110 includes a sleeve body 111 and a slider 112 . The sleeve body 111 has an end surface 111s. The slider 112 is connected to the sleeve body 111 and protrudes relative to the end surface 111s, for example, along an axial direction of the first guide rod 120 extends, where the axis direction is, for example, the Z direction. The magnet 130 is disposed on the slider 112, for example, on the inner side 112s of the slider 112. The normal direction of the inner side 112s is, for example, substantially perpendicular to the optical axis direction, such as substantially toward the -X direction. In another embodiment, the magnet 130 may also be disposed on the upper surface 112u (the upper surface 112u is shown in FIG. 1 ), the lower surface 112b (the lower surface 112b is shown in FIG. 1 ) or the outer side of the slider 112 .

As shown in Figure 3, the slider 112 of the sleeve 110 has a first through hole 112a1, and the first guide rod 120 passes through the first through hole 112a1. As shown in the figure, the outer diameter of the first guide rod 120 is smaller than the inner diameter of the first through hole 112a1, so there is a clearance c between the first guide rod 120 and the first through hole 112a1. Under the action of magnetic attraction, the first guide rod 120 maintains one-sided contact with the inner wall of the first through hole 112a1, and the clearance at the contact point T1 is 0. In addition, as shown in the figure, the connection line L1 between the axis AC1 of the first guide rod 120 and the axis AC2 of the third guide rod 160 passes through the magnet 130 . In this way, the center AC3 of the first through hole 112a1 can be close to the connection line L1. In this way, the imaging quality of the sleeve 110 can be kept stable during rotation and/or movement, and will not be affected by rotation variation and/or movement variation of the sleeve 110 .

As shown in Figure 3, the axis AC1 of the first guide rod 120 and the center AC3 of the first through hole 112a1 have a connection line L2, where the angle A1 between the connection line L2 and the connection line L1 is less than 20 degrees, preferably Unlimited less than 10 degrees, such as 5 degrees or 0 degrees. When the connecting line L1 and the connecting line L2 approximately overlap, it means that the included angle A1 is approximately 0 degrees. In this way, the mechanism center of the sleeve 110 roughly coincides with the optical axis (that is, the coaxiality is good). In other words, the mechanical center of the lens barrel 100 overlaps with the optical axis of the optical system, so that the lens barrel 100 provides excellent imaging quality.

As shown in FIG. 3 , the magnet 130 has a placement surface 130s, and the magnet 130 is placed on the sleeve 110 with the placement surface 130s. In one embodiment, the connection line L1 between the axis AC1 of the first guide rod 120 and the axis AC2 of the third guide rod 160 can pass through the center C1 of the configuration surface 130s, so that the center AC3 of the first through hole 112a1 It roughly coincides with the connection line L1, that is, the connection line L1 passes through the center AC3 of the first through hole 112a1. In this way, the finished product of the lens barrel 100 can be made close to the design specifications.

Please refer to Figures 4 to 5. Figure 4 shows a cross-sectional view of the lens barrel 100 of Figure 3 along the direction 4-4', and Figure 5 shows a cross-sectional view of the lens barrel 100 of Figure 3 along the direction 5-5'. .

As shown in Figures 4 and 5, the slider 112 further has a second through hole 112a2, and the first guide rod 120 passes through the first through hole 112a1 and the second through hole 112a2. The center C1 of the magnet 130 substantially corresponds to the intermediate position C2 between the first through hole 112a1 and the second through hole 112a2. In this way, under the action of the magnetic attraction force, the contact force F11 between the first guide rod 120 and the inner wall 112w1 of the first through hole 112a1 and the contact force F12 between the first guide rod 120 and the inner wall 112w2 of the second through hole 112a2 are substantially the same. , can make the movement of the sleeve 110 relative to the first guide rod 120 smoother, and the wear pattern of the inner wall 112w1 of the first through hole 112a1 and the wear pattern of the inner wall 112w2 of the second through hole 112a2 are also relatively consistent.

Although the interaction between the first guide rod 120 and the magnet 130 in the aforementioned embodiment The force is explained using magnetic attraction as an example, but it can also be magnetic repulsion. For example, the material of the first guide rod 120 may include magnets, and the first guide rod 120 and the magnet 130 are arranged oppositely with the same magnetic surface. In this way, a magnetic repulsion force is generated between the magnet 130 and the first guide rod 120 to produce a technical effect similar to the one-sided contact between the first guide rod 120 and the sleeve 110, except that the contact point is the contact shown in Figure 3 the opposite side of the location.

In addition, the lens barrel 100 of the aforementioned embodiment uses non-contact force (such as magnetic force) to realize the contact between the first guide rod 120 and the sleeve 110. However, the embodiment of the present invention is not limited to the non-contact force.

Please refer to Figures 6 to 7. Figure 6 shows a schematic diagram of the lens barrel 200 according to another embodiment of the present invention, and Figure 7 shows a cross-sectional view of the lens barrel 200 of Figure 6 along the direction 7-7'. The lens barrel 200 can be applied to an imaging device, such as a video camera or a camera, and can also be applied to a projection device, such as a projector or a home theater.

The lens barrel 200 includes a sleeve 110, a first guide rod 120, an elastic element 230, a second guide rod 140, a driver 150, a third guide rod 160 and a sleeve 170. In addition, the lens barrel 200 may further include a housing (not shown), the sleeve 110, the first guide rod 120, the elastic element 230, the second guide rod 140, the driver 150, the third guide rod 160 and the sleeve 170. Disposed inside the casing. The lens barrel 200 of the embodiment of the present invention has similar or identical technical features to the aforementioned lens barrel 100 . The difference is that the lens barrel 200 uses a contact force to realize the contact between the first guide rod 120 and the sleeve 110 .

Specifically, as shown in Figure 7, the elastic element 230 connects the sleeve 110 and the first guide rod 120, and can provide elastic force F21 to the first guide rod 120, so that the first guide rod 120 can The guide rod 120 is in contact with the sleeve 110 . In this embodiment, the elastic force F21 acts on the first guide rod 120, and the first guide rod 120 provides a reaction force F22 to the sleeve 110. Under the action of the reaction force F22, the sleeve 110 moves relative to the first guide rod 120 in the direction of the reaction force F22 (such as moving in the -X direction), so that the first guide rod 120 offsets the inner wall 112w1 of the first through hole 112a1. Then, the normal direction of the inner wall 112w1 is generally toward the direction of the reaction force F22.

The elastic element 230 includes a contact portion 231 and an elastic portion 232 . The contact portion 231 is in contact with the first guide rod 120 . The texture of the contact portion 231 is softer than that of the first guide rod 120 , which can reduce wear on the first guide rod 120 . The material of the contact portion 231 may include, for example, sponge, plastic, rubber or other suitable materials.

In addition, the contact portion 231 and the first guide rod 120 are not in a fixed relationship, so that the contact portion 231 and the first guide rod 120 can slide relative to each other. In this way, when the sleeve 110 moves relative to the first guide rod 120 , the contact portion 231 can slide relative to the first guide rod 120 . During the relative sliding process, under the elastic force of the elastic portion 232 , the contact portion 231 and the first guide rod 120 maintain a contact state.

As shown in FIG. 7 , the elastic part 232 connects the contact part 231 and the sleeve 110 . The elastic part 232 is, for example, a spring, a spring piece, a spring pin mechanism or other suitable mechanical components. In addition, the sleeve 110 further has an accommodating groove 110r, and the first guide rod 120 passes through the accommodating groove 110r. The first end 2321 of the elastic part 232 of the elastic element 230 is fixed on the inner wall of the accommodating groove 110r, and the second end 2322 of the elastic part 232 of the elastic element 230 is connected to the abutting part 231. The elastic part 232 provides the aforementioned elastic force F21 to The contact portion 231 is made to contact the first guide rod 120 .

As shown in FIG. 7 , the elastic force F21 provided by the elastic element 230 substantially passes through the axis AC1 of the first guide rod 120 . In this way, the stability of the sleeve 110 and the first guide rod 120 can be increased during the relative sliding process of the sleeve 110 and the first guide rod 120, which helps to reduce or even avoid camera shake.

In addition, the manufacturing method of the lens barrel 100 may include: first, arranging the magnet 130 on the sleeve 110; and then, installing the first guide rod 120 and the sleeve 110 in the lens barrel 100, wherein the first guide rod 120 has paramagnetic properties. . The manufacturing method of the aforementioned lens barrel 200 may include: first, setting the elastic element 230 on the sleeve 110; then, installing the first guide rod 120 and the sleeve 110 in the lens barrel 100, and connecting the elastic element 230 to the sleeve 110 and the second lens barrel 100. A guide rod 120. Another method of manufacturing the lens barrel 200 may include: first, installing the first guide rod 120 and the sleeve 110 in the lens barrel 100; then, installing the elastic element 230 in the sleeve 110, and connecting the elastic element 230 to the sleeve 110. The first guide rod 120.

In summary, although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended patent application scope.

100: Lens tube

110:Sleeve

111:Sleeve body

111s: End face

112:Slider

112b: Lower surface

112s: medial surface

112u: Upper surface

120:First guide rod

130:Magnet

140:Second guide rod

160:Third guide rod

170:Sleeve

Claims (9)

A lens barrel, including: a sleeve, including a sleeve body; a slider, the slider is connected to the sleeve body, the slider has a first through hole and a second through hole; a first through hole; A guide rod is provided at a position passing through the first through hole and the second through hole; a magnet is arranged on the sleeve, and a magnetic attraction force can be generated between the magnet and the first guide rod; a lead screw , connected to the sleeve; and a driver, connected to the lead screw, capable of driving the lead screw to rotate to drive the sleeve and the slider to move along an axial direction of the sleeve. The lens barrel of claim 1, wherein the first guide rod is provided on the sleeve, the sleeve body has an end surface, the slider is connected to the sleeve body, and protrudes relative to the end surface and along the first One axis of the guide rod extends, and the magnet is arranged on the slider. The lens barrel according to claim 2, wherein the center of the magnet substantially corresponds to an intermediate position between the first through hole and the second through hole. The lens barrel as claimed in claim 1, further comprising: a third guide rod disposed on the sleeve; Wherein, the connection between the axis center of the first guide rod and the axis center of the third guide rod passes through the magnet; there is a shortest distance between the magnet and the first guide rod, and a part of the sleeve Located within the shortest distance, a magnetic field line between the magnet and the first guide rod passes through the partial block. The lens barrel of claim 4, which satisfies at least one of the following conditions: (1) the magnet has a placement surface, the magnet is placed on the sleeve with the placement surface, and the axis of the first guide rod The connection line between the axis center of the third guide rod and the axis center of the third guide rod passes through the center of the arrangement surface; (2) the connection line between the axis center of the first guide rod and the axis center of the third guide rod passes through the The center of the first through hole. A lens barrel, including: a sleeve, including a sleeve body; a slider, the slider is connected to the sleeve body, the slider is further provided with a first through hole and a second through hole; a first through hole; A guide rod is provided on the sleeve, and the first guide rod passes through the first through hole and the second through hole; a magnet is arranged on the sleeve, and there is a gap between the magnet and the first guide rod. Generating magnetic attraction; a lead screw connected to the sleeve; and a driver connected to the lead screw and capable of driving the lead screw to rotate to drive the sleeve and the slider to move along an axial direction of the sleeve; wherein , there is a shortest distance between the magnet and the first guide rod, and a part of the sleeve is located within the shortest distance. The lens barrel of claim 6 further includes: an elastic element connecting the sleeve and the first guide rod and providing an elastic force to make the first guide rod and the sleeve abut. The lens barrel of claim 7, wherein the elastic element includes: a contact portion that contacts the first guide rod; and an elastic portion that connects the contact portion and the sleeve. The lens barrel according to claim 8, wherein the sleeve has an accommodating groove, the first guide rod passes through the accommodating groove, and a first end of the elastic part is fixed to the inner wall of the accommodating groove, A second end of the elastic part is slidably abutted against the first guide rod.