TW201837519A - Zoom lens - Google Patents

Abstract

A zoom lens includes a zoom lens group, a focus lens group, a first driving mechanism, a second driving mechanism, and a first photointerrupter. After the completion of the focus action, the position of the zoom lens group and the corresponding position of the focus lens group can be in a rectangular coordinate plane to form a corresponding curve. Wherein the first photointerrupter is provided with a position corresponding to a position of the zoom lens group, the position of the zoom lens group being a point of the corresponding curve at a projection point on the horizontal axis, the point of the corresponding curve meets one of the following conditions: (1) 0.1 ≤ S ≤ 5.7, (2) -5.7 ≤ S ≤ -0.1, S is the slope of the point of the corresponding curve.

Description

Zoom lens

The present invention relates to a zoom lens, and more particularly, to a zoom lens having a photo interrupter.

In recent years, security cameras have been widely used in security surveillance. Whether in homes, businesses, government agencies, or even general public places, security cameras have become an indispensable monitoring tool for personal safety and property protection. In general, security cameras can monitor the dynamics of a monitoring environment to keep abreast of special events. Therefore, when a special event occurs, the user can detect the occurrence of the event through the security camera, or the security camera can automatically notify the user so that the user can handle the special event immediately.

In the prior art, the lens module included in the security camera can be divided into various forms such as a fixed focus lens or a zoom lens. Among them, fixed-focus lenses are relatively simple in structure, have the advantages of small size, light weight, better image quality, and relatively cheap prices. They are widely used by general consumers, but they have the disadvantage of being unable to change the focal length at will, resulting in When using a security camera with a fixed focus lens, users will be limited. In addition, even if a security camera with a zoom lens is used to allow the user to adjust the focal length according to their own needs, with the development of high-pixel security cameras, it often happens that the zoom accuracy of the zoom lens does not increase correspondingly, resulting in high The image quality of the security camera of the pixel can not exert its maximum effect, and further the image quality of the security camera is affected by the insufficient precision of the zoom lens. Therefore, how to provide a way to achieve high zoom accuracy is a problem that manufacturers need to solve.

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

An embodiment of the present invention provides a zoom lens including a zoom lens group, a focusing lens group, a first driving mechanism, a second driving mechanism, and a first light interrupter. The zoom lens group and the focusing lens group have the same optical axis. The first driving mechanism can drive the zoom lens group to move along the optical axis, and the second driving mechanism can drive the focus lens group to move along the optical axis. Among them, after the focus of the zoom lens is completed, the position of the zoom lens group and the corresponding position of the focus lens group can form a corresponding curve in the rectangular coordinate plane. The rectangular coordinate plane uses the position of the zoom lens group at the wide-angle end as the origin. The direction from the wide-angle end to the telephoto end along the optical axis is the horizontal axis of the Cartesian coordinate plane. The relative distance between the zoom lens group position and the wide-angle end position of the zoom lens group is the horizontal axis coordinate, and a focus reference line position is the rectangular coordinate. The vertical axis of the plane is 0. The direction of the focus lens group moving from the focus reference line position to the wide-angle end of the focus lens group along the optical axis is the vertical axis of the rectangular coordinate plane. The relative distance between the focus lens group position and the focus reference line position is Vertical axis coordinates, where the first photo interrupter is provided with a placement position corresponding to a position of the zoom lens group, and the position of the zoom lens group is a point corresponding to a point of the curve on the horizontal axis, corresponding to the point of the curve One of the following conditions is satisfied: (1) 0.1 ≦ S ≦ 5.7, (2) -5.7 ≦ S ≦ -0.1, where S is the slope of the corresponding curve.

An embodiment of the present invention provides a zoom lens including a zoom lens group, a focusing lens group, a first driving mechanism, a second driving mechanism, and a first light interrupter. The zoom lens group and the focusing lens group have the same optical axis. The first driving mechanism can drive the zoom lens group to move along the optical axis, and the second driving mechanism can drive the focus lens group to move along the optical axis. Among them, after the focus of the zoom lens is completed, the position of the zoom lens group and the corresponding position of the focus lens group can form a corresponding curve in the rectangular coordinate plane. The rectangular coordinate plane uses the position of the zoom lens group at the wide-angle end as the origin. The direction from the wide-angle end to the telephoto end along the optical axis is the horizontal axis of the Cartesian coordinate plane. The relative distance between the zoom lens group position and the wide-angle end position of the zoom lens group is the horizontal axis coordinate, and a focus reference line position is the rectangular coordinate. The vertical axis of the plane is 0. The direction of the focus lens group moving from the focus reference line position to the wide-angle end of the focus lens group along the optical axis is the vertical axis of the rectangular coordinate plane. The relative distance between the focus lens group position and the focus reference line position is Vertical axis coordinates, where the corresponding curve has an inflection point with a slope of 0, the projection point of the inflection point on the horizontal axis is C, the point of the zoom lens group at the telephoto end corresponding to the horizontal axis is A10, and the point C on the horizontal axis is The distance from the point A10 is divided into 10 equal parts, and the 9 equal points are set as A1, A2, ..., A8, A9, and A1 is closest to the point C. The distance from the point C to the origin on the horizontal axis is divided into 10 divisions, and 9 division points B1, B2 ..., B8, B9, B9 is closest to point C. The first photo interrupter is provided with a placement position corresponding to a position of the zoom lens group, and the position of the zoom lens group meets one of the following conditions: (1) Between points A1 and A9, (2) Between points B1 and B9.

An embodiment of the present invention provides a zoom lens including a zoom lens group, a focusing lens group, a first stepping motor, a second stepping motor, and a first light interrupter. The zoom lens group and the focusing lens group have the same optical axis. The first stepping motor can drive the zoom lens group to move along the optical axis, and the second stepping motor can drive the focus lens group to move along the optical axis. Among them, after the focus of the zoom lens is completed, the position of the zoom lens group and the corresponding position of the focus lens group can form a corresponding curve in the rectangular coordinate plane. The rectangular coordinate plane uses the position of the zoom lens group at the wide-angle end as the origin. The direction from the wide-angle end to the telephoto end along the optical axis is the horizontal axis of the Cartesian coordinate plane. The relative distance between the zoom lens group position and the wide-angle end position of the zoom lens group is the horizontal axis coordinate, and a focus reference line position is the rectangular coordinate. The vertical axis of the plane is 0. The direction of the focus lens group moving from the focus reference line position to the wide-angle end of the focus lens group along the optical axis is the vertical axis of the rectangular coordinate plane. The relative distance between the focus lens group position and the focus reference line position is Vertical axis coordinates, where the corresponding curve has an inflection point with a slope of 0, the projection point of the inflection point on the horizontal axis is C, and the first stepper motor drives the zoom lens group to the telephoto direction at the inflection point position to complete the step One step forward, the projection point corresponding to the horizontal axis on the corresponding curve is H1, and the second stepper motor drives the focus lens group to move in one step in the full-step manner at the telephoto position to the inflection point. The projection point on the corresponding horizontal axis of the corresponding curve is I1. The first stepping motor drives the zoom lens group to move in one step in the full-angle direction at the inflection point position, and the projection point on the corresponding curve corresponding to the horizontal axis is J1, the second stepping motor drives the focusing lens group to move in one step in the direction of the inflection point at the wide-angle end position, and its projection point on the corresponding curve corresponding to the horizontal axis is L1, of which the first photo interrupter is provided with a The placement position corresponds to a position of the zoom lens group. This position of the zoom lens group satisfies one of the following conditions: (1) between points H1 and I1, and (2) between points J1 and L1. .

With the design of the embodiment of the present invention, the limitation of the placement position of the light interrupter through the zoom lens group and the focus lens group can make the zoom lens have high zoom accuracy. Therefore, it is possible to provide a zoom lens design that has good zoom accuracy and can provide better imaging quality.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of various embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as "up", "down", "front", "rear", "left", "right", etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used for illustration, not for limiting the present invention. In addition, the terms "first" and "second" used in the following examples are used to identify the same or similar elements, and are not intended to limit the elements. In addition, the following embodiments are only further described for the projection device and the display system. Those skilled in the art can apply this connection system to any required situation according to actual needs.

An embodiment of the present invention provides an imaging apparatus using a zoom lens. FIG. 1 shows a schematic configuration diagram of an imaging apparatus 10 according to an embodiment of the present invention. Examples of the imaging device 10 include a security camera, a digital camera, a smartphone, and a drone. The imaging device 10 includes a zoom lens 1, a filter 7 disposed on the image side of the zoom lens 1, an image sensor 8 that receives an image generated by the zoom lens 1, and a micro process that performs an arithmetic process on an output signal from the image sensor 8 Device 4, a zoom lens group control module 5 for zooming the zoom lens 1, and a focus lens group control module 6 for focusing the zoom lens 1. It is shown in FIG. 1 that the zoom lens 1 is composed of a first lens group G1 to a fifth lens group G5, but the zoom lens of the present invention is not limited to this, and may be a two lens group, a three lens group, or The number of other lens groups is sufficient as long as it has both a zoom lens group and a focusing lens group. The number of lenses included in the zoom lens group may be single or multiple, and the number of lenses included in the focus lens group may be single or multiple, which is not limited in the present invention. The image sensor 8 is, for example, a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). It should be noted that FIG. 1 shows only one image sensor 8, but the imaging device of the present invention is not limited to this, and may be a so-called three-plate type imaging device having three image sensors.

FIG. 2 is a schematic cross-sectional structural diagram of a zoom lens 1 according to an embodiment of the present invention. The zoom lens 1 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The second lens group G2 (zoom lens group) moves along the direction of the optical axis 20 for zooming, and uses the position of the wide-angle end of the zoom lens group G2 as the zoom reference line 42. The fourth lens group G4 (focusing lens group) moves along the direction of the optical axis 20 for focusing, and uses a mechanism (not shown) as the focusing reference line 44. The directions of the arrows X and -X and the light The direction of the axis 20 is the same. The direction of the arrow X is the direction in which the zoom lens group G2 moves from the wide-angle end to the telephoto end, and the direction of the arrow-X is the direction in which the zoom lens group G2 moves from the telephoto end to the wide-angle end. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed to a frame (not shown).

The driving mechanism 22 drives the zoom lens group G2 along the direction of the optical axis 20 for zooming, and the driving mechanism 24 drives the focusing lens group G4 along the direction of the optical axis 20 for focusing. Examples of the driving mechanisms 22 and 24 include stepping motors, voice coil motors, and piezoelectric elements. In this embodiment, the driving mechanisms 22 and 24 are stepping motors. It should be noted that stepping motors can be divided into full-step, half-step, and micro-step. The full step is the cogging of the rotor. Align the cogging of the stator, so the distance of each stepping stepper motor is a multiple of one step. Half stepping is to move the cogging of the rotor to the middle of the two coggings of the stator. The distance of each movement is a multiple of 1/2 step, while micro-stepping uses current and magnetic technology to achieve more fine positioning (resolution) by electronic segmentation. In this embodiment, although a full-stepping stepping motor is used, it is not limited to this, and a half-stepping or micro-stepping stepping motor may also be used.

The light interrupter 32 detects the switching between the light-shielding state and the light propagation state caused by the movement of the light-shielding portion 222 provided in the zoom lens group G2 along the optical axis 20 to confirm the position of the zoom lens group G2. Similarly, the light interrupter 34 detects the switching between the light-shielding state and the light propagation state caused by the movement of the light-shielding portion 242 provided in the focus lens group G4 along the optical axis 20 to confirm the focus of the focus lens group G4. position.

FIG. 3 shows a schematic diagram of a corresponding curve 60 drawn on the rectangular coordinate plane 50 by the zoom lens group position and the corresponding focus lens group position after the zoom lens 1 according to an embodiment of the present invention is focused. The rectangular coordinate plane 50 uses the position of the zoom lens group G2 at the wide end as the origin O, and the direction in which the zoom lens group G2 moves from the wide angle end to the telephoto end is the positive of the horizontal axis (X axis) In the direction (+ X), the relative distance between the position of the zoom lens group G2 and the position of the wide-angle end is the horizontal axis coordinate. Taking the position of the focus reference line 44 in FIG. 2 as the vertical axis (Y axis) of 0 points, and the direction in which the focusing lens group G4 moves from the reference line to the wide-angle end is the positive direction of the vertical axis (+ Y), and the focusing lens The relative distance between the position of the group G4 and the position of the reference line is the vertical axis coordinate. Table 1 shows the values of the several coordinate points K1 ~ K7 of the rectangular coordinate plane 50 after the focus lens group position and the corresponding focus lens group position are taken as the focus. Figure 3 also shows the approximate positions of K1 ~ K7 in the corresponding curve 60. Table I

In order to make the zoom lens have high zoom accuracy, an embodiment of the present invention is achieved by limiting the placement position of the zoom lens group and the photo interrupter of the zoom lens group. Please refer to FIG. 2, FIG. 3 and FIG. 4 at the same time. The corresponding curve 60 has an inflection point K4 with a slope of 0, the projection point of the inflection point K4 on the horizontal axis is C, and the zoom lens group G2 corresponds to the horizontal position at the telephoto position K7. One point on the axis is A10. The distance from point C to A10 on the horizontal axis is divided into 10 equal parts, and the 9 equal points are set to A1, A2, ..., A8, A9, and A1 is closest to point C. The distance from the point C on the axis to the origin is divided into 10 equal divisions, and the 9 division points are set to B1, B2, ..., B8, B9, and B9 is closest to the C point. Among them, the light interrupter of the zoom lens group G2 The placement position of 32, corresponding to the position of the zoom lens group, is between A1 and A9, or between B1 and B9. The better can be between A2 and A8, or between B2 and B8. The better can be between A3 and A7, or between B3 and B7. It should be noted that the placement position of the photo interrupter 32 of the zoom lens group G2 corresponds to the position of the zoom lens group, which means that the positions of the photo interrupter 32 and the zoom lens group G2 in the direction of the arrow X are the same.

Similarly, please refer to FIG. 2, FIG. 3 and FIG. 4 at the same time. The corresponding curve 60 has an inflection point K4 with a slope of 0, the projection point of the inflection point K4 on the vertical axis is D, and the focus lens group G4 is at the telephoto position. The point corresponding to the vertical axis of K7 is E10. The distance from point D to E10 on the vertical axis is divided into 10 equal parts, and the 9 equal points are set to E1, E2 ..., E8, E9, and E1 is closest to point D. The point of the focusing lens group G4 at the wide-angle end position K1 corresponding to the vertical axis is F10, and the distance from the point D on the vertical axis to the point F10 is divided into 10 equal divisions, and the 9 equal division points are respectively set to F1, F2 ..., F8, F9, and F9 are closest to point D. The position of the photo interrupter 34 of the focus lens group G4 corresponds to the position of the focus lens group, between points E1 and E9, or between points F1 and F9. Between points. The better can be between E2 and E8, or between F2 and F8. The better can be between E3 and E7, or between F3 and F7. It should be noted that the placement position of the photo interrupter 34 of the focus lens group G4 corresponds to the position of the focus lens group, which means that the positions of the photo interrupter 34 and the focus lens group G4 in the direction of the arrow X are the same.

Please refer to FIG. 2, FIG. 3 and FIG. 5 at the same time, the corresponding curve 60 has a inflection point K4 with a slope of 0, the projection point of the inflection point K4 on the horizontal axis is C, and the driving mechanism (the first stepping motor) 22 At the inflection point K4, the zoom lens group G2 is driven to the telephoto end K7 in one step (full step). The projection point of the corresponding horizontal axis on the corresponding curve 60 is H1, and the driving mechanism (the second step) The motor) 24 drives the focusing lens group G4 to move in one step in the direction of the inflection point K4 at the telephoto position K7. The projection point of the corresponding horizontal axis on the corresponding curve 60 is I1, and the driving mechanism (first step The motor) 22 drives the zoom lens group G2 at the inflection point K4 toward the wide-angle end K1 in a full-step manner, and its projection point on the corresponding horizontal axis corresponding to the curve 60 is J1. The driving mechanism (the second stepping motor) 24) At the wide-angle end K1 position, the focus lens group G4 is driven to move in one step in a full-step manner. The projection point on the corresponding horizontal axis of the corresponding curve 60 is L1, and the light interrupter of the zoom lens group G2 The placement position of 32, which corresponds to the position of the zoom lens group, is between H1 and I1, or between J1 and L1. It should be noted that the placement position of the photo interrupter 32 of the zoom lens group G2 corresponds to the position of the zoom lens group, which means that the positions of the photo interrupter 32 and the zoom lens group G2 in the direction of the arrow X are the same.

Similarly, please refer to FIG. 2, FIG. 3 and FIG. 5 at the same time, the corresponding curve 60 has a inflection point K4 with a slope of 0, the projection point of the inflection point K4 on the vertical axis is D, and the driving mechanism (the first step The motor) 22 drives the zoom lens group G2 at the inflection point K4 toward the telephoto end K7 in a full step manner, and its projection point corresponding to the vertical axis on the corresponding curve 60 is H2, and the driving mechanism (No. Two stepping motors) 24 drives the focusing lens group G4 to move in one step in the direction of the inflection point K4 at the telephoto end K7 position, and its projection point on the corresponding vertical axis corresponding to the curve 60 is I2. A stepping motor) 22 drives the zoom lens group G2 at a step K1 toward the wide-angle end K1 in a full-step manner, and its projection point on the corresponding vertical axis corresponding to the curve 60 is J2. The driving mechanism (second Stepping motor) 24 drives the focusing lens group G4 at a wide-angle end K1 in the direction of the inflection point K4 in a full step manner, and its projection point on the corresponding vertical axis corresponding to the curve 60 is L2, where the light of the focusing lens group G4 The position of the interrupter 34 corresponds to the position of the focusing lens group, between the points H2 and I2, or between the points J2 and L2 Between. It should be noted that the placement position of the photo interrupter 34 of the focus lens group G4 corresponds to the position of the focus lens group, which means that the positions of the photo interrupter 34 and the focus lens group G4 in the direction of the arrow X are the same.

In addition, the placement positions of the photo-interrupter 32 of the aforementioned zoom lens group G2 and the photo-interrupter 34 of the focus lens group G4 are both restricted by the driving mechanism (stepping motor) moving in one step in a full step. The present invention is not limited to this. Preferably, the driving mechanism (stepping motor) can be used to move the two steps in a full stepping manner to determine the positions of the H1, H2, I1, I2, J1, J2, L1, and L2 points. The better one can use the driving mechanism (stepping motor) to move the three steps in full step to determine the position of the H1, H2, I1, I2, J1, J2, L1 and L2 points.

The slope S of the corresponding curve 60 may also be used to limit the placement positions of the light interrupter 32 of the zoom lens group G2 and the light interrupter 34 of the focus lens group G4. Please refer to FIG. 2 and FIG. 3 at the same time. The placement position of the photo interrupter 32 corresponds to a position of the zoom lens group G2. This position of the zoom lens group G2 is a point corresponding to the curve 60 on the horizontal axis, corresponding to This point of the curve 60 satisfies 0.1 ≦ S ≦ 5.7 or -5.7 ≦ S ≦ -0.1, and S is the slope of the point corresponding to the curve 60. Preferably, the point corresponding to the curve 60 satisfies 0.1 ≦ S ≦ 4.7 or -4.7 ≦ S ≦ -0.1. More preferably, the point corresponding to the curve 60 satisfies 0.1 ≦ S ≦ 2.7 or -0.56 ≦ S ≦ -0.1. It should be noted that the placement position of the photo interrupter 32 of the zoom lens group G2 corresponds to the position of the zoom lens group, which means that the positions of the photo interrupter 32 and the zoom lens group G2 in the direction of the arrow X are the same. Similarly, please refer to FIG. 2 and FIG. 3 at the same time. The placement position of the photo interrupter 34 corresponds to a position of the focusing lens group G4. This position of the focusing lens group G4 is a point corresponding to the curve 60 on the vertical axis. Point, the point corresponding to the curve 60 satisfies 0.1 ≦ S ≦ 5.7 or -5.7 ≦ S ≦ -0.1, and S is the slope of the point corresponding to the curve 60. Preferably, the point corresponding to the curve 60 satisfies 0.1 ≦ S ≦ 4.7 or -4.7 ≦ S ≦ -0.1. More preferably, the point corresponding to the curve 60 satisfies 0.1 ≦ S ≦ 2.7 or -0.56 ≦ S ≦ -0.1. It should be noted that the placement position of the photo interrupter 34 of the focus lens group G4 corresponds to the position of the focus lens group, which means that the positions of the photo interrupter 34 and the focus lens group G4 in the direction of the arrow X are the same.

According to the design of the above embodiment, the limitation of the placement position of the light interrupter through the zoom lens group and the focus lens group can make the zoom lens have high zoom accuracy. Therefore, it is possible to provide a zoom lens design that has good zoom accuracy and can provide better imaging quality.

It should be noted that the parameters listed in Table 1 are for illustration only and do not limit the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application. In addition, any embodiment of the present invention or the scope of patent application does not need to achieve all the purposes or advantages or features disclosed by the invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not intended to limit the scope of rights of the present invention.

1‧‧‧ zoom lens

4‧‧‧ Microprocessor

5‧‧‧Zoom lens control module

6‧‧‧Focus lens group control module

7‧‧‧ Filter

8‧‧‧Image Sensor

10‧‧‧ Camera

20‧‧‧ Optical axis

22, 24‧‧‧ Drive mechanism (stepping motor)

222, 242‧‧‧‧ Shading Department

32, 34‧‧‧light interrupter

42‧‧‧Zoom Reference Line

44‧‧‧ focus reference line

50‧‧‧ Cartesian coordinate plane

60‧‧‧corresponding curve

A1-A9, B1-B9‧‧‧ equal points

E1-E9, F1-F9‧‧‧ equal points

A10‧‧‧ The point of the telephoto end of the zoom lens group corresponding to the horizontal axis

E10‧‧‧point at the telephoto end of the focusing lens group corresponding to the vertical axis

F10‧‧‧ The point of the wide-angle end of the focusing lens group corresponding to the vertical axis

C, D‧‧‧ projection point

G1, G3, G5 ‧‧‧ lens group

G2‧‧‧Zoom lens group (lens lens group)

G4‧‧‧Focus lens group (lens lens group)

K1-K7‧‧‧ Coordinate points

H1, H2, I1, I2, J1, J2, L1, L2‧‧‧ Projection points

X, -X‧‧‧ arrows

FIG. 1 is a schematic configuration diagram of an imaging device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional structural diagram of a zoom lens according to an embodiment of the present invention.

FIG. 3 shows a schematic diagram of a corresponding curve drawn by a zoom lens group position and a corresponding focusing lens group position on a rectangular coordinate plane after the zoom lens according to an embodiment of the present invention is focused.

FIG. 4 is a schematic diagram showing the restriction of the placement position of the photo-interrupter of the zoom lens group and the focus lens group of the zoom lens according to an embodiment of the present invention.

FIG. 5 is a schematic diagram showing the restriction of the placement position of the photo-interrupter of the zoom lens group and the focusing lens group of the zoom lens according to an embodiment of the present invention.

Claims (11)

A zoom lens includes: a zoom lens group and a focus lens group, the zoom lens group and the focus lens group are provided with the same optical axis; a first driving mechanism and a second driving mechanism The first driving mechanism can drive the zoom lens group to move along the optical axis, the second driving mechanism can drive the focusing lens group to move along the optical axis; a first photointerrupter, wherein the After the zoom lens has completed focusing, the position of the zoom lens group and the corresponding position of the focus lens group can form a corresponding curve in the rectangular coordinate plane, and the rectangular coordinate plane is set by the zoom lens group at the wide position. Is the origin, the direction in which the zoom lens group moves from the wide-angle end to the telephoto along the optical axis is a horizontal axis of the rectangular coordinate plane, the position of the zoom lens group and the position of the wide-angle end of the zoom lens group The relative distance is the coordinate of the horizontal axis, and a focus reference line position is set to a vertical axis 0 point of the rectangular coordinate plane. The focus lens group moves from the focus reference line position to the wide-angle end of the focus lens group along the optical axis. The direction of the rectangular coordinate plane is The axis is positive, and the relative distance between the position of the focus lens group and the position of the focus reference line is the vertical axis coordinate, wherein the first photo interrupter is provided with a placement position corresponding to a position of the zoom lens group, and the zoom The position of the lens group is a projection point of a point of the corresponding curve on the horizontal axis, and the point of the corresponding curve satisfies one of the following conditions: (1) 0.1 ≦ S ≦ 5.7, (2) -5.7 ≦ S ≦- 0.1, S is the slope of the point of the corresponding curve. The zoom lens according to item 1 of the patent application scope, wherein the zoom lens further includes a second light interrupter, wherein the second light interrupter is provided with a placement position corresponding to a position of the focusing lens group , The position of the focusing lens group is a projection point of the point of the corresponding curve on the vertical axis. A zoom lens includes: a zoom lens group and a focusing lens group, the zoom lens group and the focusing lens group are provided with the same optical axis; a first driving mechanism and a second driving mechanism, the first driving mechanism The second lens driving unit can drive the zoom lens group to move along the optical axis, and the second driving mechanism can drive the focusing lens group to move along the optical axis; a first photointerrupter, wherein the zoom lens is used for zooming after the focusing is completed; The position of the lens group and the corresponding position of the focusing lens group can form a corresponding curve on a rectangular coordinate plane. The rectangular coordinate plane uses the zoom lens group at the wide-angle end position as an origin. The zoom lens group consists of the wide-angle end. The direction of moving toward the telephoto end along the optical axis is a horizontal axis positive direction of the rectangular coordinate plane, and the relative distance between the position of the zoom lens group and the position of the wide-angle end of the zoom lens group is the coordinate of the horizontal axis, with a focus reference position The vertical axis of the rectangular coordinate plane is set to 0. The direction in which the focusing lens group moves from the focus reference line position to the wide-angle end of the focusing lens group along the optical axis is the positive direction of the vertical axis of the rectangular coordinate plane. Focusing lens group position and the pair The relative distance of the focal reference line position is the coordinate of the vertical axis, where the corresponding curve has an inflection point with a slope of 0, a projection point of the inflection point on the horizontal axis is C, and the zoom lens group is at the telephoto position The point corresponding to the horizontal axis is A10. The distance from point C to the point A10 on the horizontal axis is divided into 10 equal parts, and the 9 equal points are set to A1, A2, ..., A8, A9, and A1 are closest to each other. For the point C, the distance from the point C to the origin on the horizontal axis is divided into 10 equal parts, and the 9 equal points are set as B1, B2, ..., B8, B9, and B9 are closest to the point C, where The first photo interrupter is provided with a placement position corresponding to a position of the zoom lens group, and the position of the zoom lens group satisfies one of the following conditions: (1) between points A1 and A9, ( 2) Between B1 and B9. The zoom lens according to item 3 of the scope of patent application, wherein the zoom lens further includes a second light interrupter, and when the position of the zoom lens group is between A1 and A9, the inflection point A projection point on the vertical axis is D, and a point corresponding to the vertical axis at the telephoto position of the focusing lens group is E10. The distance from the D point to the E10 point on the vertical axis is divided into 10 equal parts, and 9 Equal division points are set to E1, E2 ..., E8, E9, and E1 is closest to the D point. The second photointerrupter is provided with a placement position corresponding to a position of the focusing lens group. This position of the group is between points E1 and E9. The zoom lens according to item 3 of the patent application scope, wherein the zoom lens further includes a second light interrupter, and when the position of the zoom lens group is between points B1 and B9, the inflection point A projection point on the vertical axis is D, and a point corresponding to the vertical axis at the position of the wide-angle end of the focusing lens group is F10. The distance from the D point to the F10 point on the vertical axis is divided into 10 equal parts, and 9 The division points are set to F1, F2, ..., F8, F9, and F1 is closest to the D point. The second photo interrupter is provided with a placement position corresponding to a position of the focusing lens group. This position of the group is between F1 and F9. A zoom lens includes: a zoom lens group and a focusing lens group, the zoom lens group and the focusing lens group are provided with the same optical axis; a first stepping motor and a second stepping motor, the first stepping A motor can drive the zoom lens group to move along the optical axis, and the second stepping motor can drive the focus lens group to move along the optical axis; a first light interrupter, wherein the zoom lens is used for zooming after focusing The position of the lens group and the corresponding position of the focusing lens group can form a corresponding curve on a rectangular coordinate plane. The rectangular coordinate plane uses the zoom lens group at the wide-angle end position as an origin. The zoom lens group consists of the wide-angle end. The direction of moving toward the telephoto end along the optical axis is a horizontal axis positive direction of the rectangular coordinate plane, and the relative distance between the position of the zoom lens group and the position of the wide-angle end of the zoom lens group is the coordinate of the horizontal axis, with a focus reference position The vertical axis of the rectangular coordinate plane is set to 0. The direction in which the focusing lens group moves from the focus reference line position to the wide-angle end of the focusing lens group along the optical axis is the positive direction of the vertical axis of the rectangular coordinate plane. Focusing lens group position and the pair The relative distance of the focal reference line position is the vertical axis coordinate, wherein the corresponding curve has a inflection point with a slope of 0, a projection point of the inflection point on the horizontal axis is C, and the first stepping motor is at the The position of the inflection point drives the zoom lens group to move one step in a full step manner, a projection point corresponding to the horizontal axis on the corresponding curve is H1, and the second stepping motor is in the telephoto The end position drives the focusing lens group to move in one step in the direction of the inflection point. A projection point corresponding to the horizontal axis on the corresponding curve is I1. The first stepping motor moves toward the inflection point. The wide-angle end direction drives the zoom lens group to move in one step in a full-step manner. A projection point corresponding to the horizontal axis in the corresponding curve is J1. The second stepping motor drives the wide-angle end position toward the inflection point direction. The focusing lens group moves one step in a full-step manner, and a projection point corresponding to the horizontal axis on the corresponding curve is L1, wherein the first light interrupter is provided with a placement position corresponding to a position of the zoom lens group , The position of the zoom lens group satisfies the following conditions : (1) between points H1 and I1 point, (2) between the point J1 and the point L1. The zoom lens described in item 6 of the scope of patent application, wherein the zoom lens further includes a second light interrupter, and when the position of the zoom lens group is between H1 and I1, the recurve A projection point on the vertical axis is D, and the first stepping motor drives the zoom lens group to move in a full step manner at the inflection point position toward the telephoto end, which is in the corresponding curve An upper projection point corresponding to the vertical axis is H2, and the second stepping motor drives the focusing lens group to move in one step in a full step manner at the telephoto position toward the inflection point, which corresponds to the vertical axis in the corresponding curve A projection point of is I2, wherein the second light interrupter is provided with a placement position corresponding to a position of the focusing lens group, and the position of the focusing lens group is between point H2 and point I2. The zoom lens described in item 6 of the scope of patent application, wherein the zoom lens further includes a second light interrupter, and when the position of the zoom lens group is between the point J1 and the point L1, the recurve A projection point on the vertical axis is D, and the first stepping motor drives the zoom lens group to move in a full step manner at a wide-angle direction at the inflection point position, which is in the corresponding curve An upper projection point corresponding to the vertical axis is J2, and the second stepping motor drives the focusing lens group to move in one step in a full-step manner at the wide-angle end position toward the inflection point, which corresponds to the vertical axis in the corresponding curve A projection point of is L2, wherein the second light interrupter is provided with a placement position corresponding to a position of the focusing lens group, and the position of the focusing lens group is between point J2 and point L2. A zoom lens includes: a zoom lens group and a focusing lens group, the zoom lens group and the focusing lens group are provided with the same optical axis; a first driving mechanism and a second driving mechanism, the first driving mechanism The second lens driving unit can drive the zoom lens group to move along the optical axis, and the second driving mechanism can drive the focusing lens group to move along the optical axis; a second light interrupter, wherein after the zoom lens completes focusing, the zooming The position of the lens group and the corresponding position of the focusing lens group can form a corresponding curve on a rectangular coordinate plane. The rectangular coordinate plane uses the zoom lens group at the wide-angle end position as an origin. The zoom lens group consists of the wide-angle end. The direction of moving toward the telephoto end along the optical axis is a horizontal axis positive direction of the rectangular coordinate plane, and the relative distance between the position of the zoom lens group and the position of the wide-angle end of the zoom lens group is the coordinate of the horizontal axis, with a focus reference position The vertical axis of the rectangular coordinate plane is set to 0. The direction in which the focusing lens group moves from the focus reference line position to the wide-angle end of the focusing lens group along the optical axis is the positive direction of the vertical axis of the rectangular coordinate plane. Focusing lens group position and the pair The relative distance of the focal reference line position is the vertical axis coordinate, wherein the second light interrupter is provided with a placement position corresponding to a position of the focusing lens group, and the position of the focusing lens group is a point of the corresponding curve At a projection point on the vertical axis, the point of the corresponding curve satisfies one of the following conditions: (1) 0.1 ≦ S ≦ 2.7, (2) -0.56 ≦ S ≦ -0.1, where S is the slope of the point of the corresponding curve . A zoom lens includes: a zoom lens group and a focusing lens group, the zoom lens group and the focusing lens group are provided with the same optical axis; a first driving mechanism and a second driving mechanism, the first driving mechanism The second lens driving unit can drive the zoom lens group to move along the optical axis, and the second driving mechanism can drive the focusing lens group to move along the optical axis; a first photointerrupter, wherein the zoom lens is used for zooming after the focusing is completed; The position of the lens group and the corresponding position of the focusing lens group can form a corresponding curve on a rectangular coordinate plane. The rectangular coordinate plane uses the zoom lens group at the wide-angle end position as an origin. The zoom lens group consists of the wide-angle end. The direction of moving toward the telephoto end along the optical axis is a horizontal axis positive direction of the rectangular coordinate plane, and the relative distance between the position of the zoom lens group and the position of the wide-angle end of the zoom lens group is the coordinate of the horizontal axis, with a focus baseline The vertical axis of the rectangular coordinate plane is set to 0. The direction in which the focusing lens group moves from the focus reference line position to the wide-angle end of the focusing lens group along the optical axis is the positive direction of the vertical axis of the rectangular coordinate plane. Focusing lens group position and the pair The relative distance of the focal reference line position is the coordinate of the vertical axis, the corresponding curve has a inflection point with a slope of 0, a projection point of the inflection point on the vertical axis is D, and the focusing lens group is at the telephoto end position. One point on the vertical axis should be E10. The distance from the D point to the E10 point on the vertical axis should be divided into 10 equal parts, and the 9 equal points should be set to E1, E2, ..., E8, E9, and E1 is closest to the point. Point D. The point at the wide-angle end of the focusing lens group corresponding to the vertical axis is F10. The distance from the point D on the vertical axis to the point F10 is divided into 10 equal parts, and the 9 equal points are set to F1. , F2 ..., F8, F9, F1 is closest to the D point, wherein the second photo interrupter is provided with a placement position corresponding to a position of the focusing lens group, and the position of the focusing lens group satisfies the following conditions: One: (1) between points E1 and E9, and (2) between points F1 and F9. A zoom lens includes: a zoom lens group and a focusing lens group, the zoom lens group and the focusing lens group are provided with the same optical axis; a first stepping motor and a second stepping motor, the first stepping A motor can drive the zoom lens group to move along the optical axis, and the second stepping motor can drive the focus lens group to move along the optical axis; a second light interrupter, wherein after the zoom lens completes focusing, the zoom The position of the lens group and the corresponding position of the focusing lens group can form a corresponding curve on a rectangular coordinate plane. The rectangular coordinate plane uses the zoom lens group at the wide-angle end position as an origin. The zoom lens group consists of the wide-angle end. The direction of moving toward the telephoto end along the optical axis is a horizontal axis positive direction of the rectangular coordinate plane, and the relative distance between the position of the zoom lens group and the position of the wide-angle end of the zoom lens group is the coordinate of the horizontal axis, with a focus reference position The vertical axis of the rectangular coordinate plane is set to 0. The direction in which the focusing lens group moves from the focus reference line position to the wide-angle end of the focusing lens group along the optical axis is the positive direction of the vertical axis of the rectangular coordinate plane. Focusing lens group position and the pair The relative distance of the focal reference line position is the coordinate of the vertical axis, where the corresponding curve has a inflection point with a slope of 0, a projection point of the inflection point on the vertical axis is D, and the first stepping motor is in the The inflection point position drives the zoom lens group to move one step in a full step manner, a projection point corresponding to the vertical axis on the corresponding curve is H2, and the second stepping motor is in the telephoto The end position drives the focusing lens group to move in one step in a full step manner. A projection point corresponding to the vertical axis on the corresponding curve is I2. The first stepping motor moves toward the inflection point position. The wide-angle end direction drives the zoom lens group to move one step in a full-step manner. A projection point corresponding to the vertical axis on the corresponding curve is J2. The second stepping motor drives the wide-angle end position toward the inflection point direction. The focusing lens group moves one step in a full-step manner, and a projection point corresponding to the vertical axis on the corresponding curve is L2. The second light interrupter is provided with a placement position corresponding to a position of the focusing lens group. , The position of the focusing lens group satisfies the following conditions : (1) point between H2 and I2 point, (2) L2 between the point and the point J2.