CN107436482B - Turning type telescopic fixed-focus lens and camera device - Google Patents
Turning type telescopic fixed-focus lens and camera device Download PDFInfo
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- CN107436482B CN107436482B CN201610370288.0A CN201610370288A CN107436482B CN 107436482 B CN107436482 B CN 107436482B CN 201610370288 A CN201610370288 A CN 201610370288A CN 107436482 B CN107436482 B CN 107436482B
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
Abstract
A turning telephoto lens system includes a reflector, a lens group, a filter and an image plane in order from an object side to an image side, the reflector is used for reflecting light beams from an object side to a lens group, and the lens group sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with negative diopter and a fifth lens with negative diopter from the object side to the image side, the reflector has a reflection surface for reflecting the light beam from the object side to the lens group, the turning type telescopic prime lens is provided with a first optical axis and a second optical axis, the first optical axis penetrates through the reflector, the second optical axis penetrates through optical centers of the first lens, the second lens, the third lens, the fourth lens and the fifth lens and the reflector, the first optical axis is vertically intersected with the second optical axis, and an intersection point of the vertical intersection is on the reflecting surface. In addition, the invention also provides a camera device applying the turning type telescopic fixed-focus lens.
Description
Technical Field
The invention relates to a turning type telescopic fixed-focus lens and a camera device using the same.
Background
With the trend of light, thin, short and small electronic products, the optical lens in the electronic product also needs to meet the requirements of light, thin, short and small. The turning type telephoto focus lens generally includes a plurality of lenses, and the long-focus lens has a much higher lens height than the wide-angle lens in design, so that the requirement of light, thin, short and small optical lens cannot be satisfied.
Disclosure of Invention
In view of the above, it is desirable to provide a novel folding telescopic focusing lens to solve the above problems.
In addition, it is necessary to provide an image pickup apparatus using the above turning type telescopic fixed focus lens.
A turning type telescope focusing lens comprises a reflector, a lens group, a filter and an imaging surface in sequence from an object side to an image side, wherein the reflector is used for reflecting light beams from the object side to the lens group, the lens group comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with negative diopter and a fifth lens with negative diopter in sequence from the object side to the image side, the reflector is provided with a reflecting surface used for reflecting the light beams from the object side to the lens group, the turning type telescope focusing lens is provided with a first optical axis and a second optical axis, the first optical axis passes through the reflector, the second optical axis passes through optical centers of the first lens, the second lens, the third lens, the fourth lens and the fifth lens and the reflector, and the first optical axis is vertically intersected with the second optical axis, and the intersection point of the vertical intersection is on the reflecting surface.
An image pickup device using the turning type telescopic fixed-focus lens.
The turning type telescopic fixed-focus lens can change the propagation path of the light beam from the object side from the direction propagation along the first optical axis into the direction propagation along the second optical axis through the arrangement of the reflecting mirror, so that the height of the turning type telescopic fixed-focus lens in the direction of the first optical axis can be greatly reduced, and the turning type telescopic fixed-focus lens is better suitable for thin electronic products.
Drawings
Fig. 1 is a schematic structural diagram of a turning telescopic fixed-focus lens according to a preferred embodiment of the invention.
Fig. 2 is a field curvature characteristic curve diagram of the turning telescopic fixed-focus lens according to embodiment 1 of the present invention.
Fig. 3 is a distortion characteristic curve diagram of the turning telephoto focus lens according to embodiment 1 of the present invention.
Fig. 4 is a field curvature characteristic curve diagram of the turning telescopic fixed-focus lens according to embodiment 2 of the present invention.
Fig. 5 is a distortion characteristic curve diagram of the turning telephoto focus lens according to embodiment 2 of the present invention.
Fig. 6 is a field curvature characteristic curve diagram of the turning telephoto focus lens according to embodiment 3 of the present invention.
Fig. 7 is a distortion characteristic graph of the turning telephoto focus lens according to embodiment 3 of the present invention.
Description of the main elements
Turning type telescopic fixed focus lens 100
Mirror 10
Reflecting surface 11
First surface S11
Second surface S12
Third surface S13
Fourth surface S14
Fifth surface S15
Sixth surface S16
Seventh surface S17
Eighth surface S18
Ninth surface S19
Tenth surface SS20
Eleventh surface S21
Twelfth surface S22
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, a turning telescopic fixed focus lens 100 is provided in a camera (not shown) with a camera function, such as a camera and a mobile phone. The turning telephoto focus lens system 100 includes a mirror 10, a lens group 20, a filter 30, and an image plane 40 sequentially from an object side to an image side. The reflector 10 is used for reflecting the light beam from the object side to the lens group 20.
The reflector 10 may be a flat mirror or a prism having total reflection capability. The reflector 10 has a reflective surface 11 adjacent to the lens group 20. The reflecting surface 11 is used for reflecting the light beam from the object side to the lens group 20.
The lens group 20 includes, in order from the object side to the image side, a first lens 21 having a positive refractive power, a second lens 22 having a negative refractive power, a third lens 23 having a positive refractive power, a fourth lens 24 having a negative refractive power, and a fifth lens 25 having a negative refractive power.
In order to ensure that the first lens 21 has a strong light-receiving capability, the first lens 21 satisfies the following condition: 0.3<f1/f<0.5. Wherein f is1Is the focal length of the first lens element 21, and f is the focal length of the turning telephoto focus lens system 100.
In order to ensure the proportion of the optical power of the second lens 22 in the optical system of the folding telescopic fixed-focus lens 100 so as to reduce aberrations such as spherical aberration and coma aberration, the second lens 22 satisfies the following conditions: -0.6<f2/f<-0.2. Wherein f is2Is the focal length of the second lens 22.
In order to ensure the proportion of the focal power of the third lens 23 in the optical system of the folding telescopic fixed-focus lens 100 so as to reduce aberrations such as spherical aberration and coma aberration, the third lens 23 satisfies the following conditions: 0.5<f3/f<1. Wherein f is3Is the focal length of the third lens 23.
The turning telescopic fixed-focus lens 100 has a first optical axis OA and a second optical axis OB. The first optical axis OA passes through the reflecting mirror 10, the second optical axis OB passes through optical centers of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24 and the fifth lens 25, and the second optical axis OB also passes through the reflecting mirror 10. The first optical axis OA perpendicularly intersects the second optical axis OB, and an intersection point of the perpendicular intersections is a center of the reflecting surface 11 of the mirror 10. The light beam from the object side first enters the turning telescopic fixed focus lens 100 along the direction of the first optical axis OA, irradiates on the reflecting surface 11 of the reflecting mirror 10, changes the light propagation path after being reflected by the reflecting surface 11, sequentially passes through the lens group 20 and the optical filter 30 on the second optical axis OB, and finally irradiates on the image forming surface 40. The reflector 10 is disposed to change the propagation path of the light beam from the object side from the direction of the first optical axis OA to the direction of the second optical axis OB, so as to greatly reduce the height of the turning type telescopic fixed focus lens 100 in the direction of the first optical axis OA, so that the turning type telescopic fixed focus lens 100 is better suitable for use in a thin electronic product.
The Total Track Length (TTL) of the turning telescopic fixed focus lens 100 is less than 18 mm. The total track length TTL is equal to TTL1+TTL2. Wherein, TTL1Is the distance from the object side of the reflecting mirror 10 to the intersection point of the first optical axis OA and the second optical axis OB, TTL2Is the distance from the intersection of the first optical axis OA and the second optical axis OB to the image plane 40.
To ensure that the total length of the turning telephoto zoom lens 100 is small, the turning telephoto zoom lens 100 satisfies the following conditions: 1.3< TTL/f < 1.6.
In order to ensure the thinness of the turning telephoto focus lens 100 in the direction of the first optical axis OA, the turning telephoto focus lens 100 further satisfies the following conditions: h<5.7mm；D<5 mm. Where H is the height of the projection of the mirror 10 on the first optical axis OA; d is the effective diameter size of the largest diameter lens of the lens group 20. In at least one embodiment, H is 2 × TTL1In this case, the angle between the mirror 11 and the first optical axis OA and the angle between the mirror and the second optical axis OB are both 45 degrees.
The filter 30 is located between the lens group 20 and the imaging surface 40. The filter 30 is used to filter out the invisible light before the light beam is imaged on the imaging plane 40. The filter 30 may be an infrared filter.
The image plane 40 is provided with an image capturing unit having a photoelectric conversion function, and the image capturing unit is configured to receive the light beam passing through the optical filter 30. The image capturing unit with photoelectric conversion function can be a photo sensor.
The material of each of the first lens element 21, the second lens element 22, the third lens element 23, the fourth lens element 24 and the fifth lens element 25 may be plastic or glass. Preferably, the first lens 21, the second lens 22, the third lens 23, the fourth lens 24 and the fifth lens 25 are all made of plastic, so that the weight of the bending telescopic fixed focus lens 100 can be reduced. The second lens 22 and the third lens 23 have an abbe number (abbe number Vd) of less than 30.
The surface of each of the first, second, third, fourth and fifth lenses 21, 22, 23, 24 and 25 facing the reflector 10 and the surface facing the image side are aspheric surfaces, that is, the first, second, third, fourth and fifth lenses 21, 22, 23, 24 and 25 are aspheric lenses. The 5 aspheric lenses can enable the turning type telescopic fixed focus lens 100 to realize low-view-angle image capture and low aberration and high image resolution, thereby greatly improving the imaging quality of the turning type telescopic fixed focus lens 100.
The aspheric surface may satisfy the following mathematical formula:
wherein Z is a coordinate value in the second optical axis OB direction and takes the light transmission direction as a positive direction; c is 1/R, and R is the curvature radius of the reference spherical surface; h is a coordinate value orthogonal to the second optical axis OB direction and having a positive direction above, k is a conic constant, E4、E6、E8、E10、E12、E14、E16Are aspheric coefficients. The parameter values or coefficient values of the two aspheric mathematical formulas of each aspheric lens can be respectively set to determine the focal length of the aspheric lens.
The first lens 21 has a first surface S11 facing the mirror 10 and a second surface S12 facing the image side. The second lens 22 has a third surface S13 facing the mirror 10 and a fourth surface S14 facing the image side. The third lens 23 has a fifth surface S15 facing the mirror 10 and a sixth surface S16 facing the image side. The fourth lens 24 has a seventh surface S17 facing the mirror 10 and an eighth surface S18 facing the image side. The fifth lens 25 has a ninth surface S19 facing the mirror 10 and a tenth surface S20 facing the image side. The filter 30 has an eleventh surface S21 facing the mirror 10 and a twelfth surface S22 facing the image side.
In at least one embodiment, the first surface S11 is a convex surface facing the mirror 10, the second surface S12 is a convex surface facing the image side, the third surface S13 is a concave surface facing the mirror 10, the fourth surface S14 is a concave surface facing the image side, the fifth surface S15 is a convex surface facing the mirror 10, the sixth surface S16 is a convex surface facing the image side, the seventh surface S17 is a concave surface facing the mirror 10, the eighth surface S18 is a convex surface facing the image side, the ninth surface S19 is a concave surface facing the mirror 10, and the tenth surface S20 is a convex surface facing the image side.
The turning telephoto focus lens 100 further includes an aperture stop 50, and the aperture stop 50 has a through hole (not shown). The center of the diaphragm 50 is on the second optical axis OB, the diaphragm 50 is sleeved on the first lens 21, and the convex first surface S11 of the first lens 21 passes through the through hole of the diaphragm 50 and protrudes relative to the diaphragm 50. The aperture 50 serves to limit the light flux of the light beam reflected by the mirror 10 entering the lens group 20 and to make the light beam passing through the aperture 50 more symmetrical.
To ensure the symmetry of the third lens element 23 in the turning telephoto zoom lens 100 for more effective aberration compensation, the third lens element 23 is a biconvex lens, i.e., the fifth surface S15 and the sixth surface S16 of the third lens element 23 are both convex surfaces, i.e., the third lens element 23 is a biconvex lens, and the third lens element 23 satisfies the following condition: -2<(R1/R2)/f<-0.5. Wherein R is1Is a radius of curvature, R, of the fifth surface S15 of the third lens 232Is the radius of curvature of the sixth surface S16 of the third lens 23.
The invention is further illustrated by the following specific examples.
In the following embodiments, the first lens 21, the second lens 22, the third lens 23, the fourth lens 24 and the fifth lens 25 are all made of plastic. The filter 30 is made of glass. The first surface S11, the second surface S12, the third surface S13, the fourth surface S14, the fifth surface S15, the sixth surface S16, the seventh surface S17, the eighth surface S18, the ninth surface S19 and the tenth surface S20 are all aspheric surfaces.
Example 1
In this embodiment, a length TTL from the object side of the reflecting mirror 10 to an intersection point of the first optical axis OA and the second optical axis OB12.5mm, the height H of the projection of the mirror 10 on said first optical axis OA is 5mm, and the effective diameter D of the largest diameter lens of the group of lenses 20 is 4.08 mm. The thickness of the diaphragm 50 is 0.62mm, wherein the thickness refers to the distance from the center of the diaphragm 50 to the intersection point of the first surface S11 of the first lens 21 and the second optical axis OB. The focal length f of the turning telescopic fixed-focus lens 100 is 10.9mm, the relative aperture (FNO) is 2.8, the view angle (FOV) is 29.6 degrees, and the total track length is 15.9 mm.
In the present embodiment, the radius of curvature R, the thickness, the refractive index, the abbe number, and the focal length of the surface of each lens and filter 30 are shown in table one. Conic constant k and aspheric coefficient E of each aspheric surface4、E6、E8、E10、E12、E14、E16See table two.
Table one:
referring to fig. 1, the surfaces S1, S2, and S3 show that S1 is an object plane, and S2 and S3 are virtual surfaces.
Table two:
| surface of | k | E4 | E6 | E8 | E10 | E12 | E14 | E16 |
| S11 | -0.19 | -4.431E-04 | 6.366E-04 | -6.670E-04 | 4.110E-04 | -1.366E-04 | 2.402E-05 | -1.594E-06 |
| S12 | 0.00 | -5.228E-04 | -1.034E-02 | 6.983E-03 | -2.305E-03 | 4.498E-04 | -2.625E-05 | -3.128E-06 |
| S13 | 0.00 | 2.572E-02 | -3.607E-02 | 2.290E-02 | -8.627E-03 | 1.973E-03 | -2.022E-04 | -1.222E-09 |
| S14 | -8.11 | 1.403E-02 | -2.848E-02 | 1.649E-02 | -5.419E-03 | 6.532E-04 | 1.677E-04 | -4.851E-05 |
| S15 | -33.54 | 1.227E-02 | -6.568E-03 | 1.501E-03 | -7.838E-04 | 3.629E-04 | -6.923E-05 | 4.228E-06 |
| S16 | 0.00 | 1.428E-02 | -3.141E-03 | -2.466E-03 | 2.359E-03 | -1.090E-03 | 2.845E-04 | -2.993E-05 |
| S17 | 0.00 | -1.124E-02 | 4.103E-02 | -4.658E-02 | 3.132E-02 | -1.258E-02 | 2.770E-03 | -2.474E-04 |
| S18 | 2.00 | -3.289E-02 | 4.740E-02 | -4.270E-02 | 2.307E-02 | -7.599E-03 | 1.356E-03 | -9.730E-05 |
| S19 | 0.49 | -5.683E-03 | 3.525E-02 | -2.257E-02 | 8.846E-03 | -2.077E-03 | 2.528E-04 | -1.221E-05 |
| S20 | 14.98 | 3.804E-03 | 2.090E-02 | -1.508E-02 | 6.758E-03 | -1.870E-03 | 2.919E-04 | -1.938E-05 |
The field curvature characteristic curve of the light with the wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm and 0.470 μm of the turning telephoto focus lens 100 of the present embodiment is shown in fig. 2, and the distortion characteristic curve is shown in fig. 3. Where a denotes light having a wavelength of 0.650 μm, B denotes light having a wavelength of 0.610 μm, C denotes light having a wavelength of 0.555 μm, D denotes light having a wavelength of 0.510 μm, E denotes light having a wavelength of 0.470 μm, T denotes an aberration of the turning telephoto focus lens 100 with respect to a tangential beam (tangential ray), and S denotes an aberration of the turning telephoto focus lens 100 with respect to a sagittal beam (sagittal ray).
As can be seen from fig. 2, the maximum field curvature of the turning telescopic prime lens 100 of the present embodiment is controlled within a range of (-0.01mm, 0.025 mm). As can be seen from fig. 3, the maximum distortion of the turning telescopic prime lens 100 of the present embodiment is not more than 1.8%, and the distortion curves of the light with the five wavelengths are substantially overlapped.
Example 2
In this embodiment, a length TTL from the object side of the reflecting mirror 10 to an intersection point of the first optical axis OA and the second optical axis OB12.7mm, the height H of the projection of the mirror 10 on said first optical axis OA is 5.4mm, and the effective diameter D of the largest diameter lens of the group of lenses 20 is 4.36 mm. The thickness of the diaphragm 50 is 0.53mm, wherein the thickness refers to the distance from the center of the diaphragm 50 to the intersection point of the first surface S11 of the first lens 21 and the second optical axis OB. The focal length f of the turning telescopic fixed-focus lens 100 is 11.8mm, the relative aperture (FNO) is 2.8, the view angle (FOV) is 27.6 degrees, and the total track length is 17.9 mm.
In the present embodiment, the radius of curvature R, the thickness, the refractive index, the abbe number, and the focal length of the surface of each lens and filter 30 are shown in table three. Conic constant k and aspheric coefficient E of each aspheric surface4、E6、E8、E10、E12、E14、E16See table four.
Table three:
referring to fig. 1, the surfaces S1, S2, and S3 show that S1 is an object plane, and S2 and S3 are virtual surfaces.
Table four:
| surface of | k | E4 | E6 | E8 | E10 | E12 | E14 | E16 |
| S11 | -0.22 | 1.224E-04 | 1.683E-04 | -1.193E-04 | 5.830E-05 | -1.422E-05 | 1.847E-06 | -7.608E-08 |
| S12 | 0.00 | -1.227E-03 | -6.119E-03 | 3.485E-03 | -9.154E-04 | 1.117E-04 | 6.216E-06 | -2.173E-06 |
| S13 | 0.00 | 2.599E-02 | -3.635E-02 | 2.278E-02 | -8.656E-03 | 1.975E-03 | -2.004E-04 | 1.340E-06 |
| S14 | -6.56 | 1.346E-02 | -3.349E-02 | 2.119E-02 | -8.198E-03 | 1.595E-03 | 3.596E-05 | -4.491E-05 |
| S15 | -33.65 | 6.833E-03 | -6.567E-03 | 4.621E-03 | -2.706E-03 | 9.460E-04 | -1.634E-04 | 1.067E-05 |
| S16 | 0.00 | 1.589E-02 | -2.070E-02 | 1.702E-02 | -8.030E-03 | 2.062E-03 | -2.657E-04 | 1.357E-05 |
| S17 | 0.00 | 1.702E-02 | -2.328E-02 | 1.876E-02 | -7.744E-03 | 1.531E-03 | -9.702E-05 | -3.618E-06 |
| S18 | 20.39 | -3.213E-03 | -3.151E-05 | 1.533E-04 | -2.765E-04 | 9.830E-05 | -1.187E-05 | 4.449E-07 |
| S19 | 1.65 | 1.403E-03 | 9.710E-03 | -5.888E-03 | 1.676E-03 | -2.250E-04 | 1.249E-05 | -1.628E-07 |
| S20 | 4.66 | 5.219E-03 | 6.573E-03 | -3.938E-03 | 1.341E-03 | -2.689E-04 | 3.150E-05 | -1.676E-06 |
The field curvature characteristic curve of the light with the wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm and 0.470 μm of the turning telephoto focus lens 100 of the present embodiment is shown in fig. 4, and the distortion characteristic curve is shown in fig. 5. Where a denotes light having a wavelength of 0.650 μm, B denotes light having a wavelength of 0.610 μm, C denotes light having a wavelength of 0.555 μm, D denotes light having a wavelength of 0.510 μm, E denotes light having a wavelength of 0.470 μm, T denotes an aberration of the turning telephoto focus lens 100 with respect to a tangential beam, and S denotes an aberration of the turning telephoto focus lens 100 with respect to a sagittal beam.
As can be seen from fig. 4, the maximum curvature of field of the turning telephoto focus-fixing lens 100 of the present embodiment is controlled within a range of (-0.01mm, 0.06 mm). As can be seen from fig. 5, the maximum distortion of the turning telescopic prime lens 100 of the present embodiment is not more than 1.5%, and the distortion curves of the light with five wavelengths are substantially overlapped.
Example 3
In this embodiment, a length TTL from the object side of the reflecting mirror 10 to an intersection point of the first optical axis OA and the second optical axis OB12.55mm, the height H of the projection of the mirror 10 on said first optical axis OA is 5.1mm, and the effective diameter D of the largest diameter lens of the group of lenses 20 is 4 mm. The thickness of the diaphragm 50 is 0.53mm, wherein the thickness refers to the distance from the center of the diaphragm 50 to the intersection point of the first surface S11 of the first lens 21 and the second optical axis OB. The focal length f of the turning telescopic prime lens 100 is 11mm, the relative aperture (FNO) is 2.8, the view angle (FOV) is 29.4 degrees, and the total track length is 17.1 mm.
In the present embodiment, the radius of curvature R, the thickness, the refractive index, the abbe number, and the focal length of the surface of each lens and filter 30 are shown in table one. Conic constant k and aspheric coefficient E of each aspheric surface4、E6、E8、E10、E12、E14、E16See table two.
Table five:
referring to fig. 1, the surfaces S1, S2, and S3 show that S1 is an object plane, and S2 and S3 are virtual surfaces.
Table six:
| surface of | k | E4 | E6 | E8 | E10 | E12 | E14 | E16 |
| S11 | -0.31 | 1.861E-04 | 2.973E-04 | -2.390E-04 | 1.585E-04 | -4.966E-05 | 8.300E-06 | -5.319E-07 |
| S12 | 0.00 | -3.792E-04 | -1.100E-02 | 7.919E-03 | -2.654E-03 | 4.961E-04 | -3.664E-05 | -7.934E-07 |
| S13 | 0.00 | 2.644E-02 | -3.622E-02 | 2.276E-02 | -8.675E-03 | 1.965E-03 | -2.003E-04 | 1.988E-06 |
| S14 | -8.18 | 1.204E-02 | -2.238E-02 | 1.444E-02 | -6.362E-03 | 1.279E-03 | 5.924E-05 | -4.040E-05 |
| S15 | -33.65 | 2.020E-04 | 1.876E-04 | 2.332E-03 | -2.669E-03 | 1.052E-03 | -1.754E-04 | 1.055E-05 |
| S16 | 0.00 | 8.833E-04 | -2.676E-03 | 9.776E-04 | -2.056E-04 | 2.316E-05 | 4.005E-07 | -1.649E-07 |
| S17 | 0.00 | 1.222E-02 | -7.254E-04 | -7.013E-03 | 6.147E-03 | -2.641E-03 | 6.236E-04 | -6.232E-05 |
| S18 | 20.39 | -6.211E-03 | 6.660E-03 | -4.747E-03 | 1.247E-03 | -1.150E-04 | 8.660E-07 | 1.972E-07 |
| S19 | 1.98 | -1.875E-02 | 2.482E-02 | -1.189E-02 | 3.187E-03 | -4.711E-04 | 3.418E-05 | -1.396E-07 |
| S20 | 4.66 | -5.247E-03 | 1.759E-02 | -9.648E-03 | 3.415E-03 | -7.708E-04 | 1.029E-04 | -6.160E-06 |
The field curvature characteristic curve of the light with the wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm and 0.470 μm of the turning telephoto focus lens 100 of the present embodiment is shown in fig. 6, and the distortion characteristic curve is shown in fig. 7. Where a denotes light having a wavelength of 0.650 μm, B denotes light having a wavelength of 0.610 μm, C denotes light having a wavelength of 0.555 μm, D denotes light having a wavelength of 0.510 μm, E denotes light having a wavelength of 0.470 μm, T denotes an aberration of the turning telephoto focus lens 100 with respect to a tangential beam, and S denotes an aberration of the turning telephoto focus lens 100 with respect to a sagittal beam.
As can be seen from fig. 6, the maximum curvature of field of the turning telephoto focus-fixing lens 100 of the present embodiment is controlled within a range of (-0.02mm,0.04 mm). As can be seen from fig. 7, the maximum distortion of the turning telescopic prime lens 100 of the present embodiment is not more than 0.9%, and the distortion curves of the light with the five wavelengths are substantially overlapped.
The turning telescopic fixed focus lens 100 of the present invention can change the propagation path of the light beam from the object side from propagating along the first optical axis OA to propagating along the second optical axis OB by the arrangement of the reflecting mirror 10, so that the height of the turning telescopic fixed focus lens 100 in the first optical axis OA direction can be greatly reduced, and the turning telescopic fixed focus lens 100 is better suitable for the thin electronic product. The materials of the lenses in the lens group 20 of the turning telescopic fixed-focus lens 100 are plastics, so that the weight of the turning telescopic fixed-focus lens 100 can be reduced, and the cost can be reduced. In addition, all the lenses in the lens group 20 of the turning telephoto fixed focus lens 100 of the present invention are aspheric lenses, so that the turning telephoto fixed focus lens 100 can realize low-angle image capture, low aberration and high image resolution, thereby greatly improving the imaging quality of the turning telephoto fixed focus lens 100.
In addition, it is obvious to those skilled in the art that other various corresponding changes and modifications can be made according to the technical idea of the present invention, and all such changes and modifications should fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a turning telescope tight shot which characterized in that: the turning type telephoto focusing lens sequentially comprises a reflecting mirror, a lens group, a light filter and an imaging surface from an object side to an image side, the reflecting mirror is used for reflecting light from the object side to the lens group, the lens group sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with negative diopter and a fifth lens with negative diopter from the object side to the image side, the reflecting mirror is provided with a reflecting surface used for reflecting light beams from the object side to the lens group, the turning type telephoto focusing lens is provided with a first optical axis and a second optical axis, the first optical axis passes through the reflecting mirror, the second optical axis passes through optical centers of the first lens, the second lens, the third lens, the fourth lens and the fifth lens and the reflecting mirror, and the first optical axis is perpendicularly intersected with the second optical axis, and the intersection points of the vertical intersection are on the reflecting surface;
the turning type telescopic fixed-focus lens meets the following conditions: 1.3<TTL/f<1.6；TTL＝TTL1+TTL2Wherein, TTL is total track length of the turning type telescopic fixed focus lens1Is the distance from the object side of the reflector to the intersection point of the first optical axis and the second optical axis, TTL2F is the distance from the intersection point of the first optical axis and the second optical axis to the imaging plane, and f is the focal length of the turning type telescopic prime lens.
2. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the first lens satisfies the following condition: 0.3<f1/f<0.5, wherein f1F is the focal length of the turning type telescopic fixed-focus lens.
3. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the second lens satisfies the following condition: -0.6<f2/f<-0.2, wherein f2F is the focal length of the turning type telescopic fixed-focus lens.
4. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the third lens satisfies the following condition: 0.5<f3/f<1, wherein f3F is the focal length of the turning type telescopic fixed-focus lens.
5. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the third lens is a biconvex lens, and the third lens satisfies the following conditions: -2<(R1/R2)/f<-0.5, wherein R1Is the radius of curvature, R, of the surface of the third lens facing the reflector2Is facing the image side of the third lensThe radius of curvature of the surface of (a).
6. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the surfaces of the first lens, the second lens, the third lens, the fourth lens and the fifth lens, which face the reflecting mirror, and the surfaces facing the image side are aspheric surfaces.
7. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the total track length of the turning type telescopic prime lens is less than 18 mm.
8. A folding telescopic fixed focus lens as claimed in claim 1, wherein: the turning type telescopic fixed-focus lens further meets the following conditions: h <5.7 mm; d <5mm, wherein H is the height of the projection of the reflector on the first optical axis, and D is the effective diameter size of the lens with the largest diameter in the lens group.
9. An image pickup apparatus characterized in that: the image pickup device uses the turning type telescopic fixed focus lens according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610370288.0A CN107436482B (en) | 2016-05-28 | 2016-05-28 | Turning type telescopic fixed-focus lens and camera device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610370288.0A CN107436482B (en) | 2016-05-28 | 2016-05-28 | Turning type telescopic fixed-focus lens and camera device |
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| CN107436482A CN107436482A (en) | 2017-12-05 |
| CN107436482B true CN107436482B (en) | 2021-05-11 |
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| CN201610370288.0A Active CN107436482B (en) | 2016-05-28 | 2016-05-28 | Turning type telescopic fixed-focus lens and camera device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101963591B1 (en) | 2016-12-29 | 2019-04-01 | 삼성전기주식회사 | Optical system and portable electronic device including the same |
| TWI613480B (en) | 2017-02-08 | 2018-02-01 | 大立光電股份有限公司 | Optical imaging system, imaging apparatus and electronic device |
| CN110412705B (en) * | 2018-04-26 | 2022-02-22 | 信泰光学(深圳)有限公司 | Lens module |
| TWI778776B (en) * | 2021-08-13 | 2022-09-21 | 大立光電股份有限公司 | Optical lens module and electronic device |
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| US4249798A (en) * | 1978-09-11 | 1981-02-10 | Vivitar Corporation | Miniature camera with zoom lens |
| JP2005173191A (en) * | 2003-12-11 | 2005-06-30 | Olympus Corp | Optical path bending optical system |
| KR20100026621A (en) * | 2008-09-01 | 2010-03-10 | 엘지이노텍 주식회사 | Zoom lens |
| CN202693895U (en) * | 2012-03-08 | 2013-01-23 | 大立光电股份有限公司 | Monofocal optical lens system |
| CN103487919A (en) * | 2012-06-13 | 2014-01-01 | 华晶科技股份有限公司 | Camera shooting lens set and camera shooting device of camera shooting lens set |
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| US4249798A (en) * | 1978-09-11 | 1981-02-10 | Vivitar Corporation | Miniature camera with zoom lens |
| JP2005173191A (en) * | 2003-12-11 | 2005-06-30 | Olympus Corp | Optical path bending optical system |
| KR20100026621A (en) * | 2008-09-01 | 2010-03-10 | 엘지이노텍 주식회사 | Zoom lens |
| CN202693895U (en) * | 2012-03-08 | 2013-01-23 | 大立光电股份有限公司 | Monofocal optical lens system |
| CN103487919A (en) * | 2012-06-13 | 2014-01-01 | 华晶科技股份有限公司 | Camera shooting lens set and camera shooting device of camera shooting lens set |
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| CN107436482A (en) | 2017-12-05 |
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