TWI676819B - Camera device - Google Patents

Abstract

A lens device includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is a biconcave lens with negative refractive power. The third lens has a positive refractive power. The fourth lens has refractive power and includes a concave surface facing the object side. The fifth lens has refractive power and includes a convex surface facing the object side. The sixth lens has refractive power. The seventh lens has a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along the optical axis from the object side to the image side.

Description

Lens unit (3)

The present invention relates to a lens device.

In addition to the continuous development of wide-view angle lens devices, with the different application requirements, it is also necessary to have the ability of low distortion and resistance to environmental temperature changes. Unable to meet today's needs, another lens architecture with a new architecture is required to meet the needs of large viewing angles, low distortion, and resistance to environmental temperature changes.

In view of this, the main object of the present invention is to provide a lens device with a larger viewing angle, less distortion, and resistance to environmental temperature changes, but still has good optical performance.

In one embodiment, the lens device of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is a biconcave lens with negative refractive power. The third lens has a positive refractive power. The fourth lens has refractive power and includes a concave surface facing the object side. The fifth lens has refractive power and includes a convex surface facing the object side. The sixth lens has refractive power. The seventh lens has a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens follow a light The axes are arranged in order from the object side to the image side.

In another embodiment, the fourth lens has, for example, a positive refractive power. Furthermore, the fourth lens may, for example, further include a convex surface facing the image side, the fifth lens may have a negative refractive power and may further include a concave surface toward the image side, and the sixth lens, such as a lenticular lens, may have positive refractive power.

In still another embodiment, the fourth lens described above has, for example, a negative refractive power and can further include a concave surface toward the image side, the fifth lens has a positive refractive power and can further include a convex surface toward the image side, and the sixth lens can be a double A concave lens has negative refractive power.

In yet another embodiment, the lens device satisfies the following conditions: f ₁ + f ₂ <-6 mm; where f ₁ is an effective focal length of the first lens and f ₂ is an effective focal length of the second lens.

In yet another embodiment, the lens device satisfies the following conditions: CTE ₁ + CTE ₂ > 50 × 10 ^-6 / ° C; wherein CTE ₁ is a coefficient of thermal expansion of the first lens, and CTE ₂ is the first Coefficient of thermal expansion of one of the two lenses.

In yet another embodiment, the lens device satisfies the following condition: 80 <Vd ₁ + Vd ₂ <1 4; wherein Vd ₁ is an Abbe coefficient of one of the first lenses and Vd ₂ is an Abbe coefficient of one of the second lenses.

In yet another embodiment, the third lens is a lenticular lens.

In yet another embodiment, the seventh lens is a lenticular lens.

In yet another embodiment, the third lens is cemented with the fourth lens, and the fifth lens is cemented with the sixth lens.

In yet another embodiment, the lens device of the present invention may further include an aperture disposed between the fourth lens and the fifth lens.

In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

1, 2, 3, 4‧‧‧ lens units

L11, L21, L31, L41‧‧‧First lens

L12, L22, L32, L42‧‧‧Second lens

L13, L23, L33, L43‧‧‧ Third lens

L14, L24, L34, L44‧‧‧ Fourth lens

L15, L25, L35, L45‧‧‧ fifth lens

L16, L26, L36, L46 ‧‧‧ Sixth lens

L17, L27, L37, L47‧‧‧ Seventh lens

ST1, ST2, ST3, ST4‧‧‧ aperture

OF1, OF2, OF3, OF4‧‧‧ filters

OA1, OA2, OA3, OA4‧‧‧ Optical axis

IMA1, IMA2, IMA3, IMA4‧‧‧ imaging surface

CG1, CG2, CG3, CG4‧‧‧protective glass

S11, S21, S31, S41 ‧‧‧ the image side of the first lens

S12, S22, S32, S42 ‧‧‧ the object side of the first lens

S13, S23, S33, S43‧Image side of the second lens

S14, S24, S34, S44‧‧‧ Object side of the second lens

S15, S25, S35, S45‧Image side of the third lens

S16, S26, S36, S46 ‧‧‧ Third lens, fourth lens joint surface

S17, S27, S37, S47‧Image side of the fourth lens

S18, S28, S38, S48

S19, S29, S39, S49‧Image side of the fifth lens

S110, S210, S310, S410 ‧‧‧ fifth lens, sixth lens joint surface

S111, S211, S311, S411‧‧‧ the object side of the sixth lens

Image side of S112, S212, S312, S412 ‧‧‧ seventh lens

S113, S213, S313, S413 ‧‧‧ the object side of the seventh lens

Image side of S114, S214, S314, S414‧‧‧ filters

Object side of S115, S215, S315, S415‧‧‧ filter

S116, S216, S316, S416‧‧‧ side of the protective glass

S117, S217, S317, S417‧‧‧ side of the protective glass

FIG. 1 is a schematic diagram of a lens configuration and an optical path of a first embodiment of a lens device according to the present invention.

FIG. 2A is a Field Curvature diagram of the first embodiment of the lens device according to the present invention.

FIG. 2B is a distortion diagram of the first embodiment of the lens device according to the present invention.

FIG. 2C is a diagram of a Modulation Transfer Function when the temperature is equal to 20 ° C. according to the first embodiment of the lens device according to the present invention.

FIG. 2D is a modulation transfer function diagram when the temperature is equal to 40 ° C. according to the first embodiment of the lens device according to the present invention.

FIG. 2E is a graph of the modulation transfer function when the temperature is equal to 60 ° C. according to the first embodiment of the lens device according to the present invention.

Figure 2F is a graph of the modulation transfer function when the temperature is equal to -20 ° C according to the first embodiment of the lens device according to the present invention.

FIG. 3 is a schematic diagram of a lens configuration and an optical path of a second embodiment of a lens device according to the present invention.

FIG. 4A is a field curvature diagram of a second embodiment of a lens device according to the present invention.

FIG. 4B is a distortion diagram of the second embodiment of the lens device according to the present invention.

FIG. 4C is a graph of a modulation transfer function when the temperature is equal to 20 ° C. according to the second embodiment of the lens device according to the present invention.

Figure 4D is a second embodiment of a lens device according to the present invention. Diagram of modulation transfer function.

FIG. 4E is a modulation transfer function diagram when the temperature is equal to 60 ° C. according to the second embodiment of the lens device according to the present invention.

FIG. 4F is a modulation transfer function diagram when the temperature is equal to -20 ° C according to the second embodiment of the lens device according to the present invention.

FIG. 5 is a schematic diagram of a lens configuration and an optical path of a third embodiment of a lens device according to the present invention.

FIG. 6A is a field curvature diagram of a third embodiment of a lens device according to the present invention.

FIG. 6B is a distortion diagram of a third embodiment of a lens device according to the present invention.

FIG. 6C is a modulation transfer function diagram of the third embodiment of the lens device according to the present invention when the temperature is equal to 20 ° C.

FIG. 6D is a modulation transfer function diagram when the temperature is equal to 40 ° C. according to the third embodiment of the lens device according to the present invention.

FIG. 6E is a modulation transfer function diagram of the third embodiment of the lens device according to the present invention when the temperature is equal to 60 ° C.

FIG. 6F is a modulation transfer function diagram of the third embodiment of the lens device according to the present invention when the temperature is equal to -20 ° C.

FIG. 7 is a schematic diagram of a lens configuration and an optical path of a fourth embodiment of a lens device according to the present invention.

FIG. 8A is a field curvature diagram of a fourth embodiment of a lens device according to the present invention.

FIG. 8B is a distortion diagram of a fourth embodiment of a lens device according to the present invention.

FIG. 8C is a fourth embodiment of a lens device according to the present invention. Diagram of modulation transfer function.

FIG. 8D is a graph of a modulation transfer function when the temperature is equal to 40 ° C. according to the fourth embodiment of the lens device according to the present invention.

FIG. 8E is a modulation transfer function diagram when the temperature is equal to 60 ° C. according to the fourth embodiment of the lens device according to the present invention.

FIG. 8F is a modulation transfer function diagram of the fourth embodiment of the lens device according to the present invention when the temperature is equal to -20 ° C.

The present invention provides a lens device including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and the first lens, the second lens, and the third lens. The lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along an optical axis from the object side to the image side. The first lens has negative refractive power. The first lens includes a convex surface facing an object side and a concave surface facing an image side. The second lens has negative refractive power, and the second lens is a biconcave lens. The third lens has a positive refractive power. The fourth lens has refractive power, and the fourth lens includes a concave surface facing the object side. The fifth lens has refractive power, and the fifth lens includes a convex surface facing the object side. The sixth lens has refractive power. The seventh lens has a positive refractive power.

In one or more embodiments of the present invention, the first lens may be made of a plastic material, for example, the object side surface may be an aspherical surface, and the image side surface may be an aspherical surface, for example.

In one or more embodiments of the present invention, the second lens may be made of a glass material, for example, the object side surface may be a spherical surface, and the image side surface may be a spherical surface, for example.

In one or more embodiments of the present invention, the third lens may be made of glass material, for example, the object side surface may be a spherical surface, and the image side surface may be a spherical surface, for example.

In one or more embodiments of the present invention, the fourth lens may be made of glass material, for example, the object side surface may be a spherical surface, and the image side surface may be, for example, a spherical surface.

In one or more embodiments of the present invention, the third lens may be cemented with the fourth lens, for example, thereby improving the resolution of the lens device.

In one or more embodiments of the present invention, the fifth lens may be made of glass material, for example, the object side surface may be a spherical surface, and the image side surface may be, for example, a spherical surface.

In one or more embodiments of the present invention, the sixth lens may be made of glass material, for example, the object side surface may be a spherical surface, and the image side surface may be a spherical surface, for example.

In one or more embodiments of the present invention, the fifth lens may be cemented with the sixth lens, for example, thereby improving the resolution of the lens device.

In one or more embodiments of the present invention, the object side surface of the seventh lens may be, for example, an aspherical surface, and the image side surface may be, for example, an aspherical surface.

In the present invention, the aspheric surface depression z of a lens is obtained by the following formula: z = ch ² / {1+ [1- (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ + Dh ¹⁰ + Eh ¹² + Fh ¹⁴ + Gh ¹⁶

Among them, c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A ~ G: aspheric coefficient.

In addition, the lens device meets at least one of the following conditions: f ₁ + f ₂ <-6mm (1)

CTE ₁ + CTE ₂ > 50 × 10 ^-6 / ℃ (2)

80 <Vd ₁ + Vd ₂ <140 (3)

Among them, f ₁ is an effective focal length of the first lens, f ₂ is an effective focal length of the second lens, CTE ₁ is a thermal expansion coefficient of the first lens, CTE ₂ is a thermal expansion coefficient of the second lens, and Vd ₁ is the first One lens has an Abbe coefficient, and Vd ₂ is an Abbe coefficient of a second lens. The lens device can effectively improve the viewing angle, effectively reduce distortion, effectively improve resolution, effectively resist environmental temperature changes, and effectively correct aberrations.

When the condition (1) is satisfied: f ₁ + f ₂ <-6mm, the lenses in the lens device can effectively distribute the refractive power to achieve the design requirements, and the better effect range is to satisfy the condition: -16mm <f ₁ + f ₂ <-6mm.

When the condition (2) is satisfied: CTE ₁ + CTE ₂ > 50 × 10 ^-6 / ℃, the distortion of the lens device can be effectively reduced, and the better effect range is to satisfy the condition: 50 × 10 ^-6 / ℃ <CTE ₁ + CTE ₂ <80 × 10 ^-6 / ° C.

When the condition (3) is satisfied: 80 <Vd ₁ + Vd ₂ <140, the resolution of the lens device can be effectively improved.

Various embodiments of the lens device of the present invention will now be described in detail.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a lens configuration and an optical path of a first embodiment of a lens device according to the present invention. The lens device 1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, an aperture ST1, and a first lens L11 in order from an object side to an image side along an optical axis OA1. The five lenses L15, a sixth lens L16, a seventh lens L17, a filter OF1, and a protective glass CG1. During imaging, the light from the object side is finally imaged on an imaging surface IMA1.

The first lens L11 is, for example, a meniscus lens, the object side surface S11 is a convex surface, and the image side surface S12 is a concave surface. The first lens L11 has, for example, a negative refractive power.

The second lens L12 is, for example, a biconcave lens, the object side surface S13 is a concave surface, and the image side The surface S14 is a concave surface. Both the object side surface S13 and the image side surface S14 are, for example, spherical surfaces. The second lens L12 has, for example, a negative refractive power and is made of, for example, a glass material.

The third lens L13 may be, for example, a biconvex lens, and the object side surface S15 is a convex surface, and the image side surface S16 is a convex surface. Both the object side surface S15 and the image side surface S16 are, for example, spherical surfaces. The third lens L13 has, for example, a positive refractive power, and is made of, for example, a glass material.

The fourth lens L14 may be, for example, a meniscus lens. The object side surface S16 is a concave surface, and the image side surface S17 is a convex surface. Both the object side surface S16 and the image side surface S17 are, for example, spherical surfaces. The fourth lens L14 has, for example, a positive refractive power.

The fifth lens L15 may be, for example, a meniscus lens, and an object side surface S19 thereof is a convex surface, and an image side surface S110 is a concave surface. Both the object side surface S19 and the image side surface S110 are, for example, spherical surfaces. The fifth lens L15 has, for example, a negative refractive power, and is made of, for example, a glass material.

The sixth lens L16 may be, for example, a biconvex lens, and an object side surface S110 thereof is, for example, a convex surface, and an image side surface S111 is, for example, a convex surface. Both the object side surface S110 and the image side surface S111 are spherical surfaces. The sixth lens L16 has, for example, a positive refractive power, and is made of, for example, a glass material.

The seventh lens L17 may be, for example, a biconvex lens, and an object side surface S112 thereof is a convex surface, and an image side surface S113 is a convex surface. The seventh lens L17 has a positive refractive power. The seventh lens L17 may be made of, for example, a glass material.

Both the object side S114 and the image side S115 of the filter OF1 are flat.

Both the object side surface S116 and the image side surface S117 of the cover glass CG1 are flat.

By using the lens, the aperture ST1, and a design that meets at least one of the conditions (1) to (3), the lens device 1 can effectively improve the viewing angle, effectively reduce distortion, effectively improve resolution, and effectively resist ambient temperature Variation and effective correction of aberrations.

Table 1 is the relevant parameter table of each lens of the lens device 1 in the first figure. The data in Table 1 shows that the effective focal length of the lens device 1 of the first embodiment is equal to 0.968 mm, the aperture value is equal to 2.6, the total lens length is equal to 30.0 mm, The viewing angle is equal to 149.2 degrees.

Table 2 is a table of related parameters of the aspheric surface of each lens in Table 1, where k is the Conic Constant and A ~ G are aspheric coefficients.

Table 3 shows the relevant parameter values of the lens device 1 of the first embodiment and the calculated values of corresponding conditions (1) to (3). As can be seen from Table 3, the lens device 1 of the first embodiment can satisfy the condition (1 ) To the requirements of condition (3).

In addition, the optical performance of the lens device 1 of the first embodiment can also meet the requirements, which can be seen from FIGS. 2A to 2C. FIG. 2A is a field curvature diagram of the lens device 1 of the first embodiment. FIG. 2B is a distortion diagram of the lens device 1 of the first embodiment. FIG. 2C shows a modulation transfer function diagram of the lens device 1 of the first embodiment when the temperature is equal to 20 ° C. FIG. 2D is a modulation transfer function diagram of the lens device 1 of the first embodiment when the temperature is equal to 40 ° C. FIG. 2E shows a modulation transfer function diagram of the lens device 1 of the first embodiment when the temperature is equal to 60 ° C. Figure 2F is a graph of the modulation transfer function of the lens device 1 of the first embodiment when the temperature is equal to -20 ° C.

It can be seen from FIG. 2A that the lens device 1 of the first embodiment has a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, 0.650 μm in the direction of the Tangential and Sagittal directions. The field curvature is between -0.045mm and 0.040mm.

It can be seen from FIG. 2B that the distortion caused by the lens device 1 of the first embodiment for light having a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, 0.650 μm is between -10% and 5%.

As can be seen from Figures 2C to 2F, the lens device 1 of the first embodiment has a pair of rays with a wavelength ranging from 0.4700 μm to 0.6500 μm in the meridional and sagittal directions, and the field angles are 0.00 degrees and 30.00, respectively. Degrees, 50.00 degrees, 60.00 degrees, 72.40 degrees, and the spatial frequency between 0 lp / mm and 150 lp / mm, at a temperature equal to 20 ° C Between 0.14 and 1.0 (as shown in Figure 2C), the value of the modulation transfer function at a temperature equal to 40 ° C is between 0.12 and 1.0 (as shown in Figure 2D), and at a temperature equal to 60 ° C The value of the modulation transfer function is between 0.01 and 1.0 (as shown in Figure 2E), and the value of the modulation transfer function at a temperature equal to -20 ° C is between 0.13 and 1.0 (as shown in Figure 2F) .

It is obvious that the field curvature and distortion of the lens device 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a schematic diagram of a lens configuration and an optical path of a second embodiment of a lens device according to the present invention. The lens device 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, an aperture ST2, and a first lens L21 in order from an object side to an image side along an optical axis OA2. Five lenses L25, a sixth lens L26, a seventh lens L27, a filter OF2, and a protective glass CG2. During imaging, the light from the object side is finally imaged on an imaging surface IMA2.

The surface shapes of the first lens L21, the second lens L22, the third lens L23, the fourth lens L24, the fifth lens L25, the sixth lens L26, the seventh lens L27, the filter OF2, and the protective glass CG2 and the refractive power The first lens L11, the second lens L12, the third lens L13, the fourth lens L14, the fifth lens L15, the sixth lens L16, the seventh lens L17, the filter OF1, and the protective glass in the first embodiment, respectively CG1 is similar, and the materials of the first lens L21 to the sixth lens L26 are similar to those of the first lens L11 to the sixth lens L16 of the first embodiment, respectively, and will not be repeated here.

In this embodiment, the seventh lens L27 may be made of a plastic material, for example.

By using the lens, the aperture ST2, and a design that satisfies at least one of the conditions (1) to (3), the lens device 2 can effectively improve the viewing angle, effectively reduce distortion, and have Effectively improve the resolution, effective resistance to environmental temperature changes, and effective correction of aberrations.

Table 4 is the relevant parameter table of each lens of the lens device 2 in the third figure. The data in Table 4 shows that the effective focal length of the lens device 2 of the second embodiment is equal to 0.966mm, the aperture value is equal to 2.6, the total lens length is equal to 30.0mm, The viewing angle is equal to 149.2 degrees.

Table 5 is a table of related parameters of the aspheric surface of each lens in Table 4, where k is the conic coefficient and A ~ G are aspheric coefficients.

Table 6 shows the relevant parameter values of the lens device 2 of the second embodiment and the calculated values of corresponding conditions (1) to (3). As can be seen from Table 6, the lens device 2 of the second embodiment can satisfy the condition (1 ) To the requirements of condition (3).

In addition, the optical performance of the lens device 2 of the second embodiment can also meet the requirements, which can be seen from FIGS. 4A to 4C. FIG. 4A is a field curvature diagram of the lens device 2 of the second embodiment. FIG. 4B is a distortion diagram of the lens device 2 of the second embodiment. FIG. 4C is a modulation transfer function diagram of the lens device 2 of the second embodiment when the temperature is equal to 20 ° C. FIG. 4D is a modulation transfer function diagram of the lens device 2 of the second embodiment when the temperature is equal to 40 ° C. FIG. 4E is a graph of the modulation transfer function of the lens device 2 of the second embodiment when the temperature is equal to 60 ° C. Figure 4F is a graph of the modulation transfer function of the lens device 2 of the second embodiment when the temperature is equal to -20 ° C.

As can be seen from Figure 4A, the lens device 2 of the second embodiment has a field curvature of -0.035 for the light rays with a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm. mm to 0.040mm.

It can be seen from FIG. 4B that the distortion caused by the lens device 2 of the second embodiment for light having a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, 0.650 μm is between -10% and 5%.

As can be seen from FIGS. 4C to 4F, the lens device 2 of the second embodiment has a pair of rays with a wavelength ranging from 0.4700 μm to 0.6500 μm in the meridional and sagittal directions, respectively. The field of view angles are 0.00 degrees, 30.00 degrees, 50.00 degrees, 60.00 degrees, 72.40 degrees, and the spatial frequency is between 0 lp / mm and 150 lp / mm. At a temperature equal to 20 ° C, the value of the modulation transfer function is 0.15. Between 1.0 and 1.0 (as shown in Figure 4C), the modulation transfer function value at a temperature equal to 40 ° C is between 0.05 and 1.0 (as shown in Figure 4D), and the modulation at a temperature equal to 60 ° C The transfer function value is between 0.01 and 1.0 (as shown in Figure 4E), and the modulation transfer function value at a temperature equal to -20 ° C is between 0.03 and 1.0 (as shown in Figure 4F).

It is obvious that the field curvature and distortion of the lens device 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of a lens configuration and an optical path of a third embodiment of a lens device according to the present invention. The lens device 3 includes a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, an aperture ST3, and a first lens L31 in order from an object side to an image side along an optical axis OA3. Five lenses L35, a sixth lens L36, a seventh lens L37, a filter OF3, and a protective glass CG3. During imaging, the light from the object side is finally imaged on an imaging surface IMA3.

The surface shapes of the first lens L31, the second lens L32, the third lens L33, the seventh lens L37, the filter OF3, and the protective glass CG3 are respectively the same as those of the first lens L11 and the second lens in the first embodiment. The lens L12, the third lens L13, the seventh lens L17, the filter OF1, and the protective glass CG1 are similar, and the materials of the first lens L31 to the sixth lens L36 are respectively the first lens L11 to the sixth lens of the first embodiment. L16 is similar and will not be repeated here.

In this embodiment, the fourth lens L34 may be a biconcave lens, for example, the fourth lens L34 may have a negative refractive power, the fifth lens L35 may be, for example, a biconvex lens, for example, have a positive refractive power, and the sixth lens L36 may be, for example, a biconcave lens. , For example, with negative refractive power; seventh penetration The mirror L37 may be made of, for example, a glass material.

By using the lens, the aperture ST3, and a design that meets at least one of the conditions (1) to (3), the lens device 3 can effectively improve the viewing angle, effectively reduce distortion, effectively improve resolution, and effectively resist ambient temperature Variation and effective correction of aberrations.

Table 7 is a table of related parameters of each lens of the lens device 3 in FIG. 5. The data in Table 7 shows that the effective focal length of the lens device 3 of the third embodiment is equal to 0.972 mm, the aperture value is equal to 2.6, and the total lens length is equal to 28.338 mm. The viewing angle is equal to 149.1 degrees.

Table 8 is a table of related parameters of the aspheric surface of each lens in Table 7, where k is the conic coefficient and A ~ G are aspheric coefficients.

Table 9 shows the relevant parameter values of the lens device 3 of the third embodiment and the corresponding values calculated from the conditions (1) to (3). As can be seen from Table 9, the lens devices 3 of the third embodiment are all Can meet the requirements of conditions (1) to (3).

In addition, the optical performance of the lens device 3 of the third embodiment can also meet the requirements, which can be seen from FIGS. 6A to 6C. FIG. 6A is a field curvature diagram of the lens device 3 of the third embodiment. FIG. 6B is a distortion diagram of the lens device 3 of the third embodiment. FIG. 6C is a graph of the modulation transfer function of the lens device 3 of the third embodiment when the temperature is equal to 20 ° C. FIG. 6D is a modulation transfer function diagram of the lens device 3 of the third embodiment when the temperature is equal to 40 ° C. FIG. 6E shows a modulation transfer function diagram of the lens device 3 of the third embodiment when the temperature is equal to 60 ° C. FIG. 6F is a graph of the modulation transfer function of the lens device 3 of the third embodiment when the temperature is equal to -20 ° C.

It can be seen from FIG. 6A that the lens device 3 of the third embodiment has a field curvature in the meridional direction and the sagittal direction between -0.01 and 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm. mm to 0.08mm.

It can be seen from FIG. 6B that the distortion caused by the lens device 3 of the third embodiment for light having a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, 0.650 μm is between -10% and 5%.

It can be seen from FIGS. 6C to 6F that the lens device 3 of the third embodiment has a pair of rays with a wavelength ranging from 0.4700 μm to 0.6500 μm in the meridional direction and the sagittal direction, and the field angles are 0.00 degrees and 30.00, respectively. Degrees, 50.00 degrees, 60.00 degrees, 72.40 degrees, and the spatial frequency between 0 lp / mm and 150 lp / mm, at a temperature equal to 20 ° C, the modulation transfer function value is between 0.12 and 1.0 (as shown in Figure 6C) (Shown), the modulation transfer function value at a temperature equal to 40 ° C is between 0.12 and 1.0 (as shown in Figure 6D), and the modulation transfer function value at a temperature equal to 60 ° C is between 0.02 and 1.0 (As shown in Figure 6E), the value of the modulation transfer function at a temperature equal to -20 ° C is between 0.01 and 1.0 (as shown in Figure 6F).

It is obvious that the field curvature and distortion of the lens device 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 7, which is a schematic diagram of a lens configuration and an optical path of a fourth embodiment of a lens device according to the present invention. The lens device 4 includes a first lens L41, a second lens L42, a third lens L43, a fourth lens L44, an aperture ST4, and a first lens L41 in order from an object side to an image side along an optical axis OA4. Five lenses L45, a sixth lens L46, a seventh lens L47, a filter OF4, and a protective glass CG4. During imaging, the light from the object side is finally imaged on an imaging surface IMA4, among which: the first lens L41, the second lens L42, the third lens L43, the seventh lens L47, the filter OF4, and the surface type of the protective glass CG4 The concave-convex shape and refractive power are similar to the first lens L41, the second lens L42, the third lens L43, the seventh lens L47, the filter OF1, and the protective glass CG1 in the first embodiment, and the first lens L41 to the sixth The material of the lens L46 is similar to that of the first lens L11 to the sixth lens L16 of the first embodiment, and will not be repeated here.

In this embodiment, the fourth lens L44 may be, for example, a biconcave lens having a negative The fifth lens L45 may be, for example, a biconvex lens with positive refractive power; the sixth lens L46 may be, for example, a biconcave lens with negative refractive power; and the seventh lens L47 may be made of plastic material, for example.

Utilizing the above lens, aperture ST4 and a design that satisfies at least one of the conditions (1) to (3), the lens device 4 can effectively improve the viewing angle, effectively reduce distortion, effectively improve resolution, and effectively resist ambient temperature Variation and effective correction of aberrations.

Table 10 is a table of related parameters of each lens of the lens device 4 in FIG. 7. The data in Table 10 shows that the effective focal length of the lens device 4 of the fourth embodiment is equal to 0.976 mm, the aperture value is equal to 2.6, and the total lens length is equal to 29.222 mm. The viewing angle is equal to 151.1 degrees.

Table 11 is a table of related parameters of the aspheric surface of each lens in Table 10, where k is the conic coefficient and A ~ G are aspheric coefficients.

Table 12 shows the relevant parameter values of the lens device 4 of the fourth embodiment and the calculated values of corresponding conditions (1) to (3). As can be seen from Table 12, the lens device 4 of the fourth embodiment can meet the conditions. (1) to the requirements of condition (3).

In addition, the optical performance of the lens device 4 of the fourth embodiment can also meet the requirements, which can be seen from FIGS. 8A to 8C. FIG. 8A is a field curvature diagram of the lens device 4 of the fourth embodiment. FIG. 8B is a distortion diagram of the lens device 4 of the fourth embodiment. FIG. 8C shows a modulation transfer function diagram of the lens device 4 of the fourth embodiment when the temperature is equal to 20 ° C. FIG. 8D is a graph of the modulation transfer function of the lens device 4 of the fourth embodiment when the temperature is equal to 40 ° C. FIG. 8E is a graph of the modulation transfer function of the lens device 4 of the fourth embodiment when the temperature is equal to 60 ° C. FIG. 8F is a graph of the modulation transfer function of the lens device 4 of the fourth embodiment when the temperature is equal to -20 ° C.

As can be seen from FIG. 8A, the lens device 4 of the fourth embodiment has a field curvature in the meridional direction and the sagittal direction of -0.035 for light rays with a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm. mm to 0.05mm.

It can be seen from FIG. 8B that the distortion caused by the lens device 4 of the fourth embodiment for light having a wavelength of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, 0.650 μm is between -10% and 5%.

As can be seen from Figures 8C ~ 8F, the lens device 4 of the fourth embodiment has a pair of rays with a wavelength ranging from 0.4700 μm to 0.6500 μm in the meridional and sagittal directions, respectively, and the field angles are 0.00 degrees and 30.00 Degrees, 50.00 degrees, 60.00 degrees, 72.40 degrees, with a spatial frequency between 0 lp / mm and 150 lp / mm, the modulation transfer function value at a temperature equal to 20 ° C is between 0.14 and 1.0 (as shown in Figure 8C) (Shown), the value of the modulation transfer function at a temperature equal to 40 ° C is between 0.12 and 1.0 (as shown in Figure 8D), and the value of the modulation transfer function at a temperature equal to 60 ° C is between 0.01 and 1.0 (As shown in Figure 8E), the value of the modulation transfer function at a temperature equal to -20 ° C is between 0.01 and 1.0.

It is obvious that the field curvature and distortion of the lens device 4 of the fourth embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains may make various changes and modifications without departing from the spirit and scope of the present invention. Retouching, so the scope of protection of the present invention shall be determined by the scope of the attached patent application.

Claims (10)

A lens device mainly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the first lens has a negative refractive power, The first lens includes a convex surface facing an object side and a concave surface facing an image side; the second lens has a negative refractive power, the second lens is a biconcave lens; the third lens has a positive refractive power; and the fourth lens has a refractive power, The fourth lens includes a concave surface facing the object side; the fifth lens has a refractive power, the fifth lens includes a convex surface toward the object side; the sixth lens has a refractive power; the seventh lens has a positive refractive power; wherein the first lens has a positive refractive power; The lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along the optical axis from the object side to the image side; wherein the The third lens is cemented with the fourth lens. The lens device according to item 1 of the patent application scope, wherein the lens device satisfies the following conditions: f ₁ + f ₂ <-6mm; wherein f _{1 is} an effective focal length of the first lens, and f _{2 is} the second Effective focal length of one of the lenses. The lens device according to item 1 of the patent application scope, wherein the lens device satisfies the following conditions: CTE ₁ + CTE ₂ > 50 × 10 ^-6 / ° C; wherein CTE _{1 is a} thermal expansion coefficient of the first lens, CTE _{2 is a} thermal expansion coefficient of one of the second lenses. The lens device according to item 1 of the scope of patent application, wherein the lens device satisfies the following conditions: 80 <Vd ₁ + Vd ₂ <140; wherein Vd _{1 is an} Abbe coefficient of the first lens and Vd _{2 is} the Abbe coefficient of one of the second lenses. The lens device according to item 1 of the scope of patent application, wherein the fifth lens is cemented with the sixth lens. The lens device according to item 1 of the patent application scope further includes an aperture disposed between the fourth lens and the fifth lens. The lens device according to any one of claims 1 to 6, in which the fourth lens has a positive refractive power, and the fourth lens further includes a convex surface facing the image side; the fifth lens has The negative refractive power further includes a concave surface facing the image side; and the sixth lens is a biconvex lens with positive refractive power. The lens device according to any one of claims 1 to 6 of the scope of patent application, wherein the third lens is a lenticular lens. The lens device according to any one of claims 1 to 6 of the scope of patent application, wherein the seventh lens is a lenticular lens. A lens device mainly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the first lens has a negative refractive power, The first lens includes a convex surface facing an object side and a concave surface facing an image side; the second lens has a negative refractive power, the second lens is a biconcave lens; the third lens has a positive refractive power; and the fourth lens has a negative refractive power The fourth lens includes a concave surface toward the object side and another concave surface toward the image side; the fifth lens has a positive refractive power, and the fifth lens includes a convex surface toward the object side and another convex surface toward the image side; the The sixth lens is a biconcave lens with negative refractive power; the seventh lens has positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the The seventh lens is sequentially arranged along the optical axis from the object side to the image side.