CN102375224A - Zoom Lens and Its Temperature Compensation Method - Google Patents

Abstract

The invention relates to a zoom lens and a temperature compensation method thereof. The zoom lens mainly comprises a plurality of lenses and a compensation lens, wherein the plurality of lenses comprise two plastic lenses, focal lengths of the two plastic lenses have a ratio, and the temperature compensation method comprises the step of displacing the compensation lens along an optical axis according to temperature so as to compensate for focal length deviation. In one embodiment, the ratio is greater than or equal to 0.5 and less than or equal to 2. On the premise of reducing the manufacturing cost, the volume of the zoom lens can be reduced, and the manufacturability of the zoom lens is improved.

Description

Zoom Lens and Its Temperature Compensation Method

technical field

The invention relates to a zoom lens and a temperature compensation method thereof.

Background technique

An imaging device, such as a digital camera or a digital video camera, mainly combines a lens module and an image sensor to gather image light and convert it into an electronic signal for subsequent storage, processing and transmission.

The zoom lens of the camera device is usually composed of several lenses. In order to reduce the cost of the lens and increase the market competitive advantage, one or more plastic lenses are usually used in the zoom lens. However, the plastic lens will change with the change of the ambient temperature. Changing the refractive index causes focus deviation.

In order to compensate for the focus deviation, it is necessary to increase the moving distance of the focusing lens to compensate for the loss of focal length. Because the movement space required for compensation must be reserved, the volume of the zoom lens will increase significantly, and the design difficulty of the zoom lens will also increase.

Therefore, it is urgent to propose a new zoom lens or compensation method, which can reduce the volume of the zoom lens and improve the manufacturability of the zoom lens under the premise of reducing the manufacturing cost.

It can be seen that the above-mentioned existing zoom lens obviously still has inconvenience and defects in product structure, manufacturing method and use, and needs to be further improved urgently. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve. Therefore, how to create a new zoom lens and its temperature compensation method is one of the current important research and development topics, and it has also become a goal that the industry needs to improve.

Contents of the invention

The main purpose of the present invention is to overcome the defects of the existing zoom lens and provide a new zoom lens. The technical problem to be solved is to reduce the volume of the zoom lens under the premise of reducing the manufacturing cost, and Improves the manufacturability of zoom lenses and is ideal for practical use. A zoom lens or compensation method is proposed, which can reduce the volume of the zoom lens and improve the manufacturability of the zoom lens under the premise of reducing the manufacturing cost

Another purpose of the present invention is to overcome the defects of the existing compensation method and provide a new temperature compensation method. The technical problem to be solved is to reduce the volume of the zoom lens, so that it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to a zoom lens proposed by the present invention, it includes sequentially from the object side to the image side: a first lens group with negative optical refraction power, including a first lens and a second lens; a second lens group with Positive optical refractive power, including a third lens, a fourth lens, and a fifth lens; and a third lens group, with positive optical refractive power, including a sixth lens; wherein, the second lens, the fifth lens , The sixth lens is a plastic lens, the focal length of the second lens is f2, the focal length of the fifth lens is f5, and f2 and f5 satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; .</span>$

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

The aforementioned zoom lens, wherein the first lens is a negative meniscus lens with a convex surface facing the object side, and the second lens is a positive meniscus lens with a convex surface facing the object side.

In the aforementioned zoom lens, the third lens is a biconvex lens, the fourth lens is a biconcave lens, and the fifth lens is a negative meniscus lens with a convex surface facing the object side.

The aforementioned zoom lens, wherein the sixth lens is a biconvex lens.

The aforementioned zoom lens, wherein said f2 and f5 satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.8</span>}$

The aforementioned zoom lens, wherein said f2 and f5 satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.7</span>}$

The aforementioned zoom lens, wherein the second lens, the fifth lens, and the sixth lens are aspheric lenses, and the two sides of each aspheric lens all satisfy the following aspheric mathematical formula: Among them, Z is the mirror depth, A, B, C, D are the aspheric coefficients, K is the quadratic surface coefficient, C=1/R, R is the radius of curvature, Y is the height of the mirror center, and each aspheric lens has two The values of various parameters or coefficients of the aspheric mathematical formula can be set separately to determine the focal length of the aspheric lens and comply with the focal length ratio relational expression.

The aforementioned zoom lens, wherein the material of the plastic lens comprises polycarbonate or OKP4 or APEL.

In the aforementioned zoom lens, wherein the sixth lens element is displaced along an optical axis according to temperature to compensate for focal length loss.

In the aforementioned zoom lens, when the temperature range of the sixth lens is -10°C to 50°C, the compensation displacement of the wide-angle mode is less than or equal to 0.1 mm, and the compensation displacement of the telephoto mode is less than or equal to 0.11 mm.

The aforementioned zoom lens is applied to a camera device. The aforementioned zoom lens, wherein the imaging device includes a digital camera.

The purpose of the present invention and the solution to its technical problem also adopt the following technical solutions to achieve. According to the temperature compensation method of a zoom lens proposed by the present invention, the zoom lens includes a plurality of lenses and a compensation lens in sequence from the object side to the image side, the plurality of lenses include two plastic lenses, and the two plastic lenses The focal length has a ratio, and the temperature compensation method includes displacing the compensation lens along an optical axis according to the temperature to compensate for focal length deviation. The range of displacement of the compensation lens is in the temperature range of -10°C to 50°C, wide-angle mode In telephoto mode, it is less than or equal to 0.1mm, and in telephoto mode, it is less than or equal to 0.11mm.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the temperature compensation method for the aforementioned zoom lens, if the focal lengths of the two plastic lenses are f1 and f2, then f1 and f2 satisfy the following relationship:

$\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; |</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; .</span>$

Compared with the prior art, the present invention has obvious advantages and beneficial effects. As can be seen from the above, in order to achieve the above object, the present invention provides a zoom lens, which includes in sequence from the object side to the image side: a first lens group with negative optical refraction power, including a first lens and a second lens; The lens group has a positive optical refraction power and includes a third lens, a fourth lens, and a fifth lens; and the third lens group has a positive optical refraction power and includes a sixth lens; wherein, the second lens, the fifth lens, the fifth lens The six lenses are plastic lenses, the focal length of the second lens is f2, the focal length of the fifth lens is f5, and f2 and f5 satisfy the following relationship:

According to the above purpose, an embodiment of the present invention also provides a temperature compensation method for a zoom lens. The zoom lens includes a plurality of lenses and a compensation lens in sequence from the object side to the image side. The plurality of lenses include two plastic lenses, two plastic lenses The focal length of the lens has a ratio, and the temperature compensation method includes compensating the displacement of the lens along an optical axis according to the temperature to compensate the focal length deviation, and compensating the displacement range of the lens. When the temperature range is from -10°C to 50°C, the wide-angle It is less than or equal to 0.1mm in telephoto mode and less than or equal to 0.11mm in telephoto mode.

By virtue of the above technical solutions, the present invention has at least the following advantages and beneficial effects:

The displacement of the compensation lens of the zoom lens can be reduced, and the space reserved for the displacement becomes smaller. Therefore, on the premise of reducing the manufacturing cost, the volume of the zoom lens can be effectively reduced, and the manufacturability of the zoom lens can be improved.

To sum up, the present invention discloses a zoom lens and its temperature compensation method. The zoom lens mainly includes a plurality of lenses and a compensation lens. The plurality of lenses include two plastic lenses. The focal lengths of the two plastic lenses have a ratio. The method includes compensating the displacement of the lens along an optical axis according to the temperature to compensate for the focal length deviation. The present invention has significant progress in technology, and has obvious positive effects, and is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the zoom lens of preferred embodiment of the present invention;

Fig. 2A and Fig. 2B are according to the displacement amount of the compensating lens of conventional zoom lens at various temperatures; and

3A and 3B are the displacements of the compensation lens of the zoom lens at various temperatures according to an embodiment of the present invention.

1: First lens 2: Second lens

3: Third lens 4: Fourth lens

5: fifth lens 6: sixth lens

7: flat glass 8: flat glass

9: Imaging surface 10: Optical axis

L1: First lens group L2: Second lens group

L3: The third lens group

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure and method of the zoom lens and its temperature compensation method according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. , steps, features and effects thereof are described in detail below.

Fig. 1 is a zoom lens of a preferred embodiment of the present invention. In order to show the features of this embodiment, only structures related to this embodiment are shown, and other structures are omitted. The zoom lens shown in this embodiment can be applied to an imaging device, such as a digital camera.

In this embodiment, the zoom lens mainly includes a first lens group L1, a second lens group L2, and a third lens group L3 in order from the object side to the image side. Among them, the first lens group L1 has a negative optical refraction power and includes the first lens 1 and the second lens 2; the second lens group L2 has a positive optical refraction power and includes the third lens 3, the fourth lens 4, and the fifth lens 5; the third lens group L3 has a positive optical refractive power and includes the sixth lens 6 . In addition, there may be a flat glass 7 and a flat glass 8 between the sixth lens 6 and the imaging surface 9 .

Wherein, the second lens 2, the fifth lens 5, and the sixth lens 6 are plastic lenses, the focal length of the second lens 2 is f2, the focal length of the fifth lens 5 is f5, and f2 and f5 satisfy the following relationship:

In this embodiment, the first lens 1 is a negative meniscus lens with a convex surface facing the object side, the second lens 2 is a positive meniscus lens with a convex surface facing the object side, the third lens 3 is a biconvex lens, and the fourth lens 4 is a biconcave lens. The fifth lens 5 is a negative meniscus lens whose convex surface faces the object side, and the sixth lens 6 is a biconvex lens, but the present invention is not limited thereto.

In another embodiment of the present invention, the above f2 and f5 satisfy the following relationship: $0.8\&le;\frac{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}2}{\left|\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}5\right|}\&le;1.8.$

In another embodiment of the present invention, the above f2 and f5 satisfy the following relationship: $1\&le;\frac{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}2}{\left|\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}5\right|}\&le;1.7.$

In another embodiment of the present invention, the above f2 and f5 satisfy the following relationship: $1.2\&le;\frac{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}2}{\left|\mathrm{<figure-callout\; id="5"\; label="f"\; filenames="HSA00000222669400011.png"\; state="\{\{state\}\}">f</figure-callout>}5\right|}\&le;1.6.$

其中Z为镜面深度(Sag)，A、B、C、D为非球面系数，K为二次曲面常数，C＝1/R，R为曲率半径，Y为镜面中心高度，且每一非球面透镜的两非球面数学式的各项参数或系数的值可分别设定，以决定该非球面透镜的焦距，并符合以上各焦距比值关系式。According to the embodiment of the present invention, the second lens 2, the fifth lens 5, and the sixth lens 6 are aspheric lenses, and both sides of each aspheric lens satisfy the following aspheric mathematical formula:

Where Z is the mirror depth (Sag), A, B, C, D are the aspheric coefficients, K is the quadratic surface constant, C=1/R, R is the radius of curvature, Y is the center height of the mirror, and each aspheric surface The values of the parameters or coefficients of the two aspherical mathematical formulas of the lens can be set separately to determine the focal length of the aspheric lens, and conform to the above-mentioned focal length ratio relational expressions.

Tables 1 to 3 show detailed data of zoom lenses according to embodiments of the present invention. Table 1 shows the coefficient data of each aspheric lens, because each aspheric lens has two sets of parameters, so the three aspheric lenses will have six sets of parameters, where the R1 surface faces the object side, and the R2 surface faces the image side. Taking the R1 surface of the second lens 2 facing the object side as an example, the curvature radius R of the R1 surface is 8.000, the coefficient K is 0.0000, the coefficient A is -4.49399E-04, the coefficient B is 1.26778E-05, and the coefficient C is - 4.49887E-07, coefficient D is 0.00000E+00.

Table I

Table 2 shows the detailed data of the aspheric lens according to Table 1, applied to the zoom lens of the embodiment of FIG. The surface numbers of the lens are arranged sequentially from the object side (obj) to the image side (image), for example, "surface 1" represents the surface of the first lens 1 facing the object side, and "surface 2" represents the surface of the first lens 1 facing the image side The "surface 3" represents the surface of the second lens 2 facing the object side. In addition, the distance (zoom) represents the distance between the mirror and the previous mirror, indicating that the distance between the two mirrors is different according to the wide-angle mode (wide) and the telephoto mode (tele). The detailed data is shown in Table 3. In addition, the seventh lens, i.e. flat glass 7, its surface facing the object side, i.e. "surface 14", may have an infrared filter coating (IR-cut coating), and the eighth lens 8, i.e. flat glass 8. It can be used to protect the imaging surface.

Table II

bifocal wide-angle mode telephoto mode Surface 4 9.969133501 0.480593903 Surface 10 4.772135672 15.61327916 Surface 12 0.777833558 0.1

Table three

According to an embodiment of the present invention, the material of the plastic aspheric lens may include polycarbonate, OKP4, APEL, and the like.

In the zoom lenses of the above-mentioned embodiments, one of the lenses, such as the sixth lens 6, is used as a focus compensation lens, which is displaced along an optical axis 10 according to the operating temperature to compensate for the loss of focal length. According to the zoom lens of the embodiment of the present invention, at the same operating temperature, the displacement of the compensation lens can be greatly reduced compared with the prior art. For example, FIG. 2A and FIG. 2B show the displacement of the compensation lens of the conventional zoom lens at various temperatures, and FIG. 3A and FIG. 3B show the displacement of the compensation lens of the zoom lens according to the embodiment of the present invention at various temperatures. As shown in the figure, when the temperature ranges from -10°C to 50°C, the displacement of the compensation lens of the existing conventional zoom lens is less than or equal to 0.12 mm in the wide-angle mode (wide), and less than or equal to 0.12 mm in the telephoto mode (tele). Or equal to 0.3 mm; the displacement of the compensation lens of the zoom lens of the present invention is less than or equal to 0.1 mm in wide-angle mode and less than or equal to 0.11 mm in telephoto mode in the same temperature range. The embodiment of the present invention can reduce the displacement of the compensation lens of the zoom lens, and the space reserved for the displacement becomes smaller. Therefore, on the premise of reducing the manufacturing cost, the volume of the zoom lens can be effectively reduced, and the manufacturability of the zoom lens can be improved.

In addition, the zoom lens in the embodiment of the present invention can be changed into equivalent functions, and is not limited to the above-mentioned 6-element structure. Therefore, another embodiment of the present invention provides a temperature compensation method for a zoom lens. The zoom lens includes a plurality of lenses and a compensation lens in sequence from the object side to the image side. The plurality of lenses include two plastic lenses, two The focal length of the plastic lens has a ratio, and the temperature compensation method includes compensating the displacement of the lens along an optical axis according to the temperature to compensate for the focal length deviation, and compensating the displacement range of the lens. When the temperature range is from -10°C to 50°C, the wide-angle It is less than or equal to 0.1mm in telephoto mode and less than or equal to 0.11mm in telephoto mode.

In addition, if the focal lengths of the two plastic lenses are f1 and f2, then f1 and f2 satisfy the following relationship: In another embodiment of the present invention, the above f1 and f2 satisfy the following relationship:

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the method and technical content disclosed above to make some changes or modifications to equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (14)

1. A kind of zoom lens is characterized in that, comprises sequentially from object side to image side: A first lens group, with negative optical refractive power, includes a first lens and a second lens; A second lens group, with positive optical refractive power, includes a third lens, a fourth lens, and a fifth lens; and A third lens group with positive optical refractive power, including a sixth lens; Wherein, the second lens, the fifth lens, and the sixth lens are plastic lenses, the focal length of the second lens is f2, and the focal length of the fifth lens is f5, and f2 and f5 satisfy the following relationship: $\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; .</span>$ 2. The zoom lens according to claim 1, wherein the first lens is a negative meniscus lens with a convex surface facing the object side, and the second lens is a positive meniscus lens with a convex surface facing the object side. 3. The zoom lens according to claim 1, wherein the third lens is a biconvex lens, the fourth lens is a biconcave lens, and the fifth lens is a negative meniscus lens with a convex surface facing the object side. 4. The zoom lens according to claim 1, wherein the sixth lens is a biconvex lens. 5. The zoom lens according to claim 1, wherein said f2 and f5 satisfy the following relationship: $\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.8</span>}$ 6. The zoom lens according to claim 1, wherein said f2 and f5 satisfy the following relationship: $\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; |</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 1.7</span>}$ 7. zoom lens according to claim 1, is characterized in that, wherein said second lens, the 5th lens, the 6th lens are aspheric lens, and the two sides of each aspheric lens all satisfy following aspherical surface mathematical formula:

Among them, Z is the mirror depth, A, B, C, D are the aspheric coefficients, K is the quadratic surface coefficient, C=1/R, R is the radius of curvature, Y is the height of the mirror center, and each aspheric lens has two The values of various parameters or coefficients of the aspheric mathematical formula can be set separately to determine the focal length of the aspheric lens and comply with the focal length ratio relational expression. 8. The zoom lens according to claim 1, wherein the material of the plastic lens comprises polycarbonate, OKP4 or APEL. 9. The zoom lens according to claim 1, wherein the sixth lens element is displaced along an optical axis according to temperature to compensate for focal length loss. 10. The zoom lens according to claim 1, wherein when the temperature range of the sixth lens is -10°C to 50°C, the compensation displacement of the wide-angle mode is less than or equal to 0.1 mm, and the telephoto mode The amount of compensation displacement is less than or equal to 0.11mm. 11. The zoom lens according to claim 1, wherein it is applied to an imaging device. 12. The zoom lens according to claim 11, wherein the imaging device comprises a digital camera. 13. A temperature compensation method for a zoom lens, characterized in that the zoom lens includes a plurality of lenses and a compensation lens in sequence from the object side to the image side, the plurality of lenses include two plastic lenses, and the two plastic lenses The focal length of the lens has a ratio, and the temperature compensation method includes displacing the compensation lens along an optical axis according to the temperature to compensate the focal length deviation. The displacement range of the compensation lens is in the temperature range of -10°C to 50°C, Less than or equal to 0.1 mm in wide-angle mode, and less than or equal to 0.11 mm in telephoto mode. 14. The temperature compensation method of the zoom lens according to claim 13, wherein if the focal lengths of the two plastic lenses are f1 and f2, then f1 and f2 satisfy the following relationship: $\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; |</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; .</span>$

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