TWM363000U - Photographic lens and photographic device - Google Patents

Description

.M363000 V. New description: [New technical field] This creation is about photographic lenses and photographic devices. More specifically, it is suitable for use with CCD (Charge Coupled Device) or CMOS (Complementary). A vehicle-mounted camera, a camera for a mobile terminal, a camera lens such as a surveillance camera, and the like, and an imaging device including the imaging lens, such as a metal Oxide semiconductor. [Prior Art] In recent years, miniaturization and high pixelation of photographic elements such as CCD and CMOS have been extremely advanced. At the same time, the size of the photographic apparatus having these photographic elements has also been reduced, and the photographic lens mounted thereon is required to be smaller and lighter in addition to good optical performance. On the one hand, it is required to have a high weather resistance in a vehicle-mounted camera or a surveillance camera, and it can be used in a wide temperature range from the atmosphere of a cold area to a summer in a tropical place. High performance lens. In particular, in a camera that is placed in a vehicle and monitored in front of the vehicle, a wide wavelength band 20 having a small F number and a visible light range to the infrared region is required, so that it can be used at night. Further, when used as a vehicle-mounted camera, it is required to require a small lens portion to be exposed from the viewpoint of the appearance of the vehicle. The photographic lens which can be used in the above field is proposed by the applicant in Japanese Patent Application No. 2007-132334. Further, as a six-piece junction 3 known in the past, the M363000 lens has the imaging lenses described in Patent Documents 1 to 4 below. In the patent document IU, a photographic lens in which a negative, positive, positive, light paste, negative, positive, and a mirror are arranged from the object side is described. Patent Document 2 discloses that a lens arrangement in which a lens is arranged in a negative, positive, negative, positive, and negative direction from the object side is described as a negative, positive, and optical column in the order from the object side. A photographic lens with a positive, positive, and positive lens configuration. In the patent document, record

A photographic lens that is arranged in the negative, positive, positive, diaphragm, negative, positive, and positive lenses from the object side. [Patent Document 1] Japanese Patent Laid-Open Publication No. 55-45-7. 1 [Patent Document 2] Japanese Patent Publication No. Hei. [Patent Document 3] Japanese Patent Laid-Open Publication No. Hei 9-230232. [Patent Document 4] Japanese Patent Laid-Open Publication No. Hei. However, it is also considered that an in-vehicle camera or a surveillance camera is used at night, and therefore an optical system having a small F number is desired. However, the number of the imaging lenses F described in Patent Documents i and 2 is as large as 3.3 to 45, which is a so-called dark optical system, and is not preferable. Patent Document 4 also discloses that the F number is 2.5, and there is room for improvement in this point, and an aspherical lens is used, so that it is cost-effective. In addition, the angle of view proposed in the patent application No. 2-7-132334 is about 20, which is a portion for requiring a wide angle of the approach as a vehicle-mounted camera or a surveillance camera. [New content] The present invention has been made in view of the above circumstances, and an object thereof is to provide a photographic 4 M363000 lens which realizes a wide angle, a small size, a small F number, and a low cost, and has excellent optical performance, and a photographic apparatus having the same . Side and ==!= from the object side in order: facing the concave surface toward the image lens, ... the lens has a positive power of the second two:: the third lens of the power, the light barrier, the biconcave lens and the focus sound The fourth lens of the degree of Chu, and the positive light of the convex surface facing the image side: the five-lens of the heart, the younger one with the convex surface facing the object side, and the material of the fourth lens of the lens The Abbe number of the entangled line is 3 〇 or less 10 15 Set the composite focal length from the fourth lens to the sixth lens: When ί456, the following conditional expression (〗) is satisfied. 1.00<f456/f<i.88 (1) The photographic lens of the present invention is suitably selected as described above to facilitate the realization of an optical system having a wide-angle, small, and F-number optical performance. It may be that the structure of the aspherical surface is not necessarily used, so that cost reduction can be achieved. Further, in the photographic lens of the present invention, the Abbe number of the fourth lens having a large negative refractive power placed near the diaphragm is 3 Å or less', thereby facilitating the correction of the chromatic aberration, and the transmission is configured to satisfy Conditional formula (1) makes correction of distortion and field curvature easy, and becomes advantageous for wide angle. In the photographic lens of the present invention, preferably, the absolute value of the radius of curvature of the object side of the second lens is larger than the absolute value of the radius of curvature of the surface of the image side, and the absolute radius of curvature of the surface of the object side of the second lens is absolute. The value is smaller than the absolute value of the radius of curvature of the face on the image side, the absolute value of the radius of curvature of the face on the object side of the fifth lens is larger than the absolute value of the radius of curvature of the face on the image side, and the radius of curvature of the face on the object side of the sixth lens The absolute value is less than the 5 -M3 63 000 absolute value of the radius of curvature of the face on the image side. Further, as a preferred mode of the radius of curvature of the surface on the object side and the image side, any one of the second, fifth, and sixth lenses may be satisfied, or any combination may be satisfied. Further, in the photographic lens of the present invention, the following conditional expressions, (2) and (6) are preferably satisfied. Further, as a preferred embodiment, any of the following conditional expressions (2) to (6) may be satisfied, or any combination may be satisfied. 0.30<|R8/R9|<0.90··· (2)

〇.15<Bf/ ( L-Bf) <0.25··· (3) 1.20<f5/f<1.50··· (4) 〇.3<D6/D7<1.2··· ( 5 ) 〇 .3<|fl/f2|<l.〇··. (6) where f is the focal length fi of the entire system: the focal length f2 of the first lens: the focal length of the second lens: the focal length of the fifth lens R8: Radius of curvature R9 of the face of the object side of the four lens. Radius of curvature D6 of the face of the image side of the fourth lens: Air space D7 of the optical axis of the third lens and the light barrier: on the optical axis of the light interceptor and the fourth lens Air gap L. Distance from the object side surface of the lens closest to the object side to the optical axis on the image plane (the rear load portion is the air conversion length) B f : from the image side of the lens closest to the image side The distance from the top to the image plane (air conversion length) 6 , M363000 and in the case of 'aspherical lens, the above-mentioned "concave surface", "convex surface", "double concave", "curvature radius", assume The near-axis area is considered. The photographing apparatus of the present invention includes the photographing lens of the present invention described above. / 5 According to the present creation, in a lens system composed of at least six sheets, it is appropriately set. The configuration of the shape, the power, the material, and the like of each lens satisfies the conditional expression (1). Therefore, it is possible to provide a photographic lens that can achieve wide angle, small size, small F number, low cost, and good optical performance. [Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. First, an embodiment of the imaging lens of the present invention will be described, and then an embodiment of the imaging device will be described. A lens cross-sectional view of the photographic lens 1 according to an embodiment of the present invention is shown. In Fig. 1, the left side of the figure is the object side, and the right side is the image side, and the beam 2 from the object point at a distance of infinity is the largest. The off-axis rays 3, 4 of the angle of view are also shown together. Here, the on-axis ray refers to the beam from the object point on the optical axis z, and the off-axis optical axis refers to the object from outside the optical axis Z. In Fig. 1, considering the case where the photographing lens 1 is applied to the photographing apparatus, the photographing element 5 disposed on the image plane including the imaging position Pirn of the photographing lens 1 is also illustrated. The photographing element 5 is to be photographed by the photographing lens 1. The resulting optical image is converted into a telecommunication signal, for example, by a CCD image sensor, etc. Further, in Fig. 1, a parallel plate plate disposed between the lens system and the photographic element 25 5 (image surface) is shown together. The optical member pp and the light shielding means 丨丨, i2 disposed on the image side of the seventh, M3 63 000 lens L1 and the second lens L2. The optical member PP and the light blocking mechanisms 11 and 12 are not essential for the present invention. The photographic lens 1 includes, in order from the object side, a first lens L1 having a negative refractive power with a concave surface facing the image side, a second lens L2 having a positive refractive power, and a positive optical focus. The third lens L3, the aperture stop st, the biconcave lens, that is, the fourth lens L4 having a negative refractive power, the fifth lens L5 having a positive refractive power toward the image side, and the convex surface toward the object side The sixth lens L6 having a positive refractive power. The photographic lens 构成 is composed of a minimum of six such relatively small number of through lenses, so that the total length in the optical axis direction can be miniaturized. Moreover, the aperture stop st in Fig. 1 does not indicate a shape or size, but represents a position on the optical axis z. The first lens L1 is a lens having a negative refractive power toward the image side, so that the entire system can be wide-angled. The first lens L1 is a lens having a negative refractive power with a concave surface facing the image side of 15 so that the off-axis light can be refracted in the direction along the optical axis, and the radial direction of the lens system can be made small. In the example shown, when the first lens is a double concave lens, the negative refractive power of the first lens u can be increased, and the radial direction of the lens system can be made smaller. Preferably, the absolute value of the radius of curvature of the surface on the object side of the first lens 11 is large; the absolute value of the radius of curvature of φ on the image side is * * This can well correct the image curvature. Preferably, the material of the flute and the co-worker L1 has an Abbe number of 40 for the d-line, and is used to suppress the occurrence of axial chromatic aberration and chromatic aberration of magnification. 8 M363000 The first lens L2 and the third lens [3 are positive lenses, so that the positive power is divided into two lenses on the object side than the aperture first stop St, so that the spherical aberration can be well corrected (also called the ball). Poor), for example, even an optical system of 2. 〇 or less, it is easy to achieve good optical performance. The second lens L2 has a convex surface on the image side, so that the curvature of field can be corrected satisfactorily. The second lens L2 has an absolute value of the radius of curvature of the surface on the object side larger than the absolute value of the radius of curvature of the surface on the image side, so that the spherical aberration and the field curvature can be satisfactorily corrected. Preferably, the Abbe number of the material of the second lens L2 to the d line is 25 or more, and thus the occurrence of axial coloring (four) and chromatic aberration of magnification can be suppressed. The third lens L3 has a convex surface on the object side, so that the image plane curvature can be satisfactorily corrected. The absolute value of the radius of curvature of the surface on the object side of the third lens L 3 is smaller than the absolute value of the radius of curvature of the surface on the side of the image 15, so that spherical aberration and field curvature can be satisfactorily corrected. The Abbe number of the material of the second lens L3 to the d line is preferably 4 Å or more, whereby the occurrence of axial chromatic aberration and chromatic aberration of magnification can be suppressed. The fourth lens L4 is set as a biconcave lens so that it has a large negative focus of 20 degrees. The Abbe number of the material of the fourth lens L4 to the d line is preferably 3 Å or less, so that the axial chromatic aberration and the chromatic aberration of magnification can be favorably corrected. The fifth lens L5 and the sixth lens are positive lenses, so that the positive power is dispersed to the two lenses on the image side of the aperture stop St, so that the 9·M3 63 000 can be well-forged. Aberration, for example, even? Optical systems with a number of 2 〇 or less can also achieve good optical performance. The surface on the image side of the fifth lens L5 is a convex surface, whereby the field curvature can be satisfactorily corrected. 5 The absolute value of the radius of curvature of the surface on the object side of the fifth lens L5 is larger than the absolute value of the radius of curvature of the surface on the image side, so that spherical aberration and field curvature can be satisfactorily corrected. The material pair of the fifth lens L5 (the Abbe number of one line is preferably 4 Å or more, whereby occurrence of axial chromatic aberration and lateral chromatic aberration can be suppressed.) 1 物 Object side of the sixth lens 1^6 Since the surface is a convex surface, the image surface and the curvature can be satisfactorily corrected. The absolute value of the radius of curvature of the surface on the object side of the sixth lens L6 is smaller than the absolute value of the radius of curvature of the surface on the image side, so that it can be satisfactorily Correcting the spherical aberration and the curvature of field. 15 The material of the sixth lens [6 is preferably 40 or more in the Abbe number of the d line, thereby suppressing the occurrence of axial chromatic aberration and chromatic aberration of magnification. The photographic lens of the embodiment preferably satisfies the following conditional expressions (1) to (9). Further, as a preferred embodiment, any one of the conditional expressions (1) to (9) may be satisfied or may be satisfied. Any group of 20. 1.00<f456/f<1.88...(1) 0.30<|R8/R9|<0.90... (2) 〇.15<Bf/(L-Bf) <0.25. .. (3) 1.20<f5/f<1.50...(4) /M363000 0.3<D6/D7<1.2... (5) 0.3<|fl/f2|<1.0... (6) 2.0<ED1/IH<4.0... (7) 2.0<L/f<7.0 ··· (8) 5 0.3<Bf/f<1.2··· (9) where f: the focal length fl of the entire system: the focal length f2 of the first lens L1: the focal length of the second lens L2 10 f5: the fifth lens The focal length f5 of L5. The combined focal length R8 from the fourth lens L4 to the sixth lens L6. The radius of curvature R9 of the surface of the object side of the fourth lens L4. The radius of curvature D6 of the image side of the fourth lens L4: The air gap 15 D7 on the optical axis of the three lens L3 and the aperture stop St: the air gap L on the optical axis of the aperture stop St and the fourth lens L4: from the object side surface of the first lens L1 to the image plane Distance on the optical axis (the back intercept is the air conversion length)

Bf: distance from the image side surface of the sixth lens L6 to the optical axis on the image plane (corresponding to the back intercept, air conversion length). EDI: The maximum ray height of the surface on the object side of the first lens L1. IH: maximum image height and 'ED, IH' can be determined, for example, according to the specifications of the photographic lens or the specifications of the applicable imaging device. When the upper limit exceeds the upper limit of the conditional expression (1), it is closer to the image side than the aperture stop st. The three of the M363000, the combined power of the mirror is reduced, and it is difficult to correct the distortion well and the wide angle is lower than the conditional expression (1). The lower limit is larger than the combined power of the three lenses on the image side of the aperture light, and it is difficult to correct the curvature of field, the back intercept k & the lens system and the image placed on the image plane Various filters, cover glass, and the like are disposed between the five components. When the upper limit of the conditional expression (2) is exceeded, it is difficult to satisfactorily correct the curvature of field to the right lower than the lower limit of the conditional expression (2), and the absolute value of the radius of curvature of the surface on the object side of the fourth lens ridge is too small, which is difficult. machining. When the upper limit of the conditional expression (3) is exceeded, the overall size of the system is increased. When the lower limit of the conditional expression (3) is lower than the lower limit of the conditional expression (3), the rear intercept is shortened, and it is difficult to arrange various filters or cover glass between the lens system and the imaging element disposed in the image. When the right is beyond the upper limit of the conditional expression (4), it is difficult to correct the curvature of field well. If the lower limit of the conditional expression (4) is lower, the power of the fifth lens (10) becomes too large, and the manufacturing error and assembly error with respect to the eccentricity are excessive. The allowable amount is reduced by 15 and it is difficult to assemble or become a cause of rising costs. If the right is beyond the upper limit of the conditional expression (5), the lens diameter of the lens that is closer to the object side than the aperture side of the aperture light stop St will be t if the lens is smaller than the lower limit of the conditional expression (5). The diaphragm St is excessively close to the first pass L3, so that the lens diameter 20 of the lens on the image side of the aperture stop is larger. When the right exceeds the upper limit of the conditional expression (6), the power of the first lens li is decreased, it is difficult to widen the angle, or it is difficult to take a long back intercept. If it is lower than the lower limit of the gas (6), it is difficult to correct the curvature of field and the surface change satisfactorily. When the upper limit of the conditional expression (7) is exceeded, the effective straightness of the first lens L1 is 12 - M363000 η: it is difficult to downsize the portion of the lens exposed to the outside. When the lens is mounted on a vehicle-mounted camera, it is desirable that the portion of the lens exposed to the outside is small so as not to impair the appearance of the vehicle. Therefore, the upper limit of conditional expression (7) is satisfied. If the lower limit of the ( (4) part (7) is set, the optical system separation shaft that can be exposed to the outside can be placed on the side of the object side:: 旦: The image fabric is well corrected by the specific aperture light. Cutting and off-axis light, and it is difficult to "the upper limit of the part (8)", the optical axis direction = the mirror system will become large, or it will be difficult to wide-angle. If it is lower than the stop, the total length becomes too short, and the lenses become thin. It is difficult to process and assemble the lens. 』"丄, and ^ exceeds the upper limit of the conditional expression (9), and the rear intercept becomes too long. (9) Down; "Difficult to change the distance" It is difficult to arrange various light-passing sheets or cover glass between the lens system and the imaging elements disposed on the image surface. In addition, it is easy to cause a ghost which is caused by the return light from the photographing element to the lens system. Further, the 'photographic lens of the present embodiment' preferably satisfies the following condition = r (2 - D, (y (1-1) ' (2- l ; 6 - i ) (7 - i ) l.l < f456/ f<1.88 ... 0.4<|R8/R9|<0.90 . 〇.4<|fl/f2|<0.8 ... 3.0<ED1/IH<4.0 ... 2.0<L/f&lt ;4.0 ..· ( 8 13 -1) M363000 0.5<Bf/f<l.〇... ( 9__ j ^ by satisfying the conditional formula (1 - n for various filters or cover glass two-surface curvature) The correction and the use of the mm intercept are made easier. The Thai, Λ, Λ m, become a more favorable structure in processing. By satisfying the conditional formula (6-υ upper limit or long back intercept. Conditional formula (6-υ: see = good correction of curvature of field, distortion. School: over-satisfying conditional Ο-D 'is more conducive to good curvature of the surface curvature. In the conditional formula (8-υ In the case where the lens system can be made smaller, the effect obtained by satisfying the conditional expression (9-υ(1) s can be achieved. The condition of the 15 纟 满足 满足 20 20 20 20 20 20 20 20 20 20 20 20 20 20 严格 严格 严格 严格 严格 严格 严格 严格Μ·/ 'The lens L1 disposed on the object side closest to the object side is preferably Uses a surface that is stronger than 'resistance' and wind and rain, and the temperature of direct sunlight. Use a chemical that is stronger than grease/salting agent, that is, high in weatherability, weather resistance, acid resistance, and chemical resistance. In addition, it is preferable to use a material that is placed on the object side closest to the object side, and it is preferable to use a material that is hard to break. According to the above, as the first lens _ material, the father of the eight places, the glass, or It is also possible to use a transparent ceramic material. The ceramic-strength is superior to ordinary glass and has high heat resistance. The center thickness of the lens L1 is preferably 〇_5 mm or more. For example, when used in a vehicle-mounted camera, the lens system requires various types of lenses. The strength of the impact. 14

M363000 In addition, the photographic lens! For example, when it is applied to a car camera, it is required to be used in a wide temperature range from the atmosphere in a cold area to the summer in a tropical place. When used in a wide temperature range, as a material of the lens, a material having a small coefficient of linear expansion is preferably used. In the case of a vehicle-mounted camera or the like, when it is required to be used in a wide temperature range, it is preferable that all of the lens materials are glass. In this case, the first lens L1 may be provided with a waterproof structure to block the flow of air with the atmosphere so that fog does not occur inside due to a sudden temperature change or humidity change. As the waterproof structure, a sealing structure can be formed by bonding the first lens and the lens frame, or a hermetic member such as a 〇-shaped ring can be placed between the first lens L1 and the lens frame to form a sealed structure. Further, when the lens system is used in a sharp temperature environment or a humidity environment, it is preferable that the lens system does not use a cemented lens (also referred to as a bonded lens). For example, when it is applied to a car camera, the condition can be used in a wide temperature range in the car in the cold region to the summer in the tropical region. When using a bonded lens, it is necessary to use a special adhesive for a wide temperature range, which may cause a cost increase. Further, in order to fabricate the lens at a low cost, preferably, all of the lenses are spherical and rectangular lenses. Alternatively, an aspherical lens may be used in order to more accurately correct various aberrations when performance is emphasized. Further, plastic can be used as a material of the lens in order to form an aspheric surface with high precision and at a low cost. Further, when the photographic lens 1 is applied to a photographing apparatus, it is preferable to provide a cover glass, a low-pass filter, or 15 &gt;1363000 = an outer-line cut-off glazing sheet according to the structure of the camera side on which the lens is mounted, and the optical portion is For these envisaged parts. : If the 'photo lens 丨 is used in the car (4) position, it can be used as a squint camera for night vision, and a filter such as a cut-off ultraviolet to blue light can be inserted between the lens system and the photographic element.曰 or ' Instead of arranging various filters such as a low-light film or a specific wavelength band between the lens system and the photographic element 5, these _ light sheets may be disposed between the respective permeable layers. Alternatively, in the lens surface of any (four) mirror which the photographic lens i has, it is possible to apply the same beam as the respective illuminating sheets (4) 10 叩 and 15 • the beam outside the effective diameter between the nickel at the splicing edge becomes stray light When the image plane is reached, it is possible to form a ghost image. Therefore, it is preferable to provide a light blocking mechanism that blocks the stray light, as needed. As the light blocking means, for example, an opaque paint may be applied to a portion other than the effective diameter of the lens, or an opaque plate may be provided. Alternatively, a member such as a hood that blocks stray light may be disposed on the object side of the lens closest to the object side. As an example, in the picture! In the above, an example in which the light shielding mechanisms 11 and 12 are provided on the image side surfaces of the first lens L1 and the second lens L2 is shown. However, the portion in which the light shielding mechanism is provided is not limited to the example shown in FIG. 1 and may be disposed in other lenses. Or between lenses. Further, a member that blocks peripheral light may be disposed between the lenses. The peripheral light refers to light passing through the peripheral portion of the entrance of the optical system among the light rays from the object point outside the optical axis Z. The peripheral light is blocked in a range in which the peripheral light amount is practically no problem, so that the image quality of the peripheral portion of the image forming area can be improved. In addition, the ghosting light is blocked by the component, so that ghosting can be reduced. 16 M363000 [Embodiment] Next, a specific numerical embodiment of the photographic lens of the present invention will be described. <Example 1> Fig. 2 is a view showing a lens configuration of a photographing lens of Example 1, and Table 1 shows lens data and various materials. [Table 1]

Example 1 lens data

Si Ri Di Ndj vdj 1 -23. 43 0.70 1. 7725 49.6 2 6. 15 2. 50 3 30. 05 3.90 1. 8830 40.8 4 -12. 55 0.11 5 9.58 4.50 1. 7550 52. 3 6 -14. 19 0.89 7 (Aperture stop) - 0.97 8 -5, 66 0.70 1. 9229 18.9 9 8. 22 0.64 10 100. 17 3.00 1.7550 52. 3 11 -5.39 0.10 12 8.86 2. 30 1. 7725 49.6 13 -73.14 3.40 14 〇〇0.40 1. 5168 64. 2 15 〇〇0.50 Image----- Example 1 Various Information

Fno. 2 ω L ~~6274~~ ~214T Bf f ~57〇7~~ fl f2 ΐ〇Γ48~~ f3 ~8~2Γ~ f4 f5 6. 86 f6 f456 ·-. 7. 60 IH ~2? 8^ EDI --——-1 The lens data of 10 Μ1 indicates that the surface number closest to the object side is the first one, and the i-th (i 1 and 2) are sequentially increased toward the image side. , 3, ...) face number. Moreover, the lens data of Table i also includes an aperture stop St and an optical member pp.匕17 ' M3 63 000 The Ri of Table 1 represents the radius of curvature of the i-th (iy, 2, 3, ...) plane, and Di represents the i-th (i = 1, 2, 3, ...) plane and The surface spacing on the optical axis 2 of i+i faces. In addition, 'Ndj indicates that the optical factor closest to the object side is set to the first one, and the first one is added sequentially toward the image side (]· = 1, 2, 3, ...) 5 optical factor versus d line V (y represents the Abbe number of the eleventh optical factor to the d line. In Table 1, the radius of curvature is set to be positive when the object side is convex and negative when the image side is convex. In the various materials of Table 1, Fn 〇 denotes an F number, 2 ω denotes a full angle of view, and L denotes a distance 10 from the object side surface of the first lens L1 to the optical axis of the image plane (the back intercept portion) It is the air conversion length), Bf is the distance from the image side surface of the sixth lens to the image plane (corresponding to the back intercept and air conversion length), f is the focal length of the entire system, and f is the first lens L丨The focal length, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, μ is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, and f6 is the focal length of the sixth lens L6 15, f456 Is a composite focal length from the fourth lens L4 to the sixth lens L6 (combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6), It is the maximum image height on the image plane, and the EDI is the maximum light ray height of the object side surface of the first lens L1. In the various materials of Table 1, the unit of 2ω is the degree. As the curvature of Table 1, the radius of 20 and the surface interval are The unit, the L ' Bf of Table 1, the focal length, the combined focal length, the unit of IH, and ED 1 use "mm" here. However, even if the optical system is scaled up or scaled down, the same optical performance is obtained, so the unit is not limited. ''mm'' can also use other suitable units. In Figure 2, the left side of the figure is the object side, and the right side is the image side. The 18 M363000 aperture diaphragm st shown in Figure 2 does not represent the shape or size, indicating light. The symbol scale of the bit on the axis z is equivalent to the definition of the table, the meaning of the symbol in Table 1 described above, and the diagram method of the lens structure diagram are basically the same for the embodiments to be described later.

The photographic lens of Embodiment 1 is, in order from the object side, a first lens L of a biconcave lens, a second lens of the lenticular lens, a third lens of the lenticular lens, an aperture stop st, a fourth lens L4 of the biconcave lens, and a double lens. The fifth lens L5 of the convex lens and the sixth lens L6 of the lenticular lens are formed. 10 &lt;Example 2&gt; Fig. 3 shows a lens configuration diagram of the photographing lens of Example 2, and Table 2 shows lens data and various materials. The photographic lens of the second embodiment is composed of a second lens L1 of a biconcave lens, a second lens L2 of a positive meniscus lens having a convex surface toward the image side, a third lens L3 of a lenticular lens, an aperture diaphragm, and a double lens from the object side. The fourth lens L4 of the concave 15 lens, the fifth lens L5 of the lenticular lens, and the sixth lens L6 of the lenticular lens are formed.

Set. Figure 2, Di. [Table 2] Example 2 Lens data Si Ri Di Ndj vdj 1 -22.50 0. 70 1. 7725 • 49.6 2 6. 47 ~~ — 1. 75 3 -30.17 2.T〇-~-·~-__ 1.8893 38 4 -9. 57 1. 14 5 7.24 4.50 1. 7550 52. 3 6 -14.54 0. 90 7 (aperture stop) — 1.04 8 -5. 27 0. 70 1. 9229 I. 18.9 9 8.61 Example 2 various materials

Fno. 2.00 ~ 2 ω 62.8 L 23.46 Bf 4.36 f 5.09 fl ------- ~6. 44 f2 14.82 f3 7.02~~ f4 -3· 46 f5 7.17 19 M363000 11 12 200.01 ^53* 2.70οΓϊο

13 8.40 14 60 15 Image surface

2.20 ^60 0^40 050

F6 8. 89 f456 7.56 IH 2.8 EDI 8.29 &lt;Example 3 &gt;

The sinus and the photographic lens of the photographic lens of Example 3 are shown in Table 3. Table 3 shows: 枓 and various materials. The photographic lens of the third embodiment is sequentially composed of the first lens U of the biconcave lens, the second lens L2 of the positive meniscus lens having the convex surface toward the image side, the third lens u of the lenticular lens, and the aperture light from the object side. The fourth lens L4 of the biconcave lens, the fifth lens L5 of the positive meniscus lens having the convex surface toward the image side, and the sixth lens of the positive meniscus lens having the convex surface facing the object side are formed. 10 [Table 3]

Example 3 Lens Information Si Ri Di Ndj v dj 1 -23. 96 0.70 1. 7725 49.6 2 7.88 2. 50 3 -43. 22 2.80 1. 8780 39. 1 4 -10. 39 3.0 Factory 5 6.47 4.50 1.7550 52 3 6 -17. 58 Γ 0.25 7 (aperture stop) - 1.06 — 8 -5. 17 0. 70 1.9229 18.9 9 8. 65 0.57 10 -42. 76 2. 50 1.8348 42. 7 11 -5.41 0. 10 —— L. Example 3 Various materials Fno, 2ω 62ΤΓ L ~5749^ Bf --------- 4.26 f fl ---- -7/60^ f2 1198 f3 Τδϊ ~ f4 :3Γ4Γ~~ ~ f5 -------- f6 ϊ〇7〇5~~~~ f456 9^5~~^ 20 M363000

IH 2.8 EDI 9.05 &lt;Example 4&gt; Fig. 5 shows a lens configuration diagram of the photographing lens of Example 4, and Table 4 shows lens data and various materials. The photographic lens of the fourth embodiment is a first lens L1 of a double concave lens from the object side, a first lens L2 of a positive meniscus lens having a convex surface toward the image side, a third lens L3 of a lenticular lens, and an aperture stop light St. The fourth lens L4 of the biconcave lens, the fifth lens L5 of the lenticular lens, and the sixth lens L6 of the lenticular lens are formed. [Table 4]

Example 4 lens data

Si Ri Di Ndj v dj 1 '134.90 0. 70 1.7725 49.6 2 5. 76 2. 50 3 2^1. 86 2.21 1.8679 40.2 4 -9. 33 1.59 5 5. 75 4. 50 1.8348 42.7 6 '15.17 1. 10 7 (aperture stop) — 1.03 8 -5.34 0.70 1.9229 18.9 9 6.59 0.60 10 171.34 r 2. 70 1 1.8348 42.7 11 '5. 91 0. 10 12 7. 12 2.00 1. 7550 52. 3 13 '39.28 3.30 14 〇〇0. 40 1.5168 64.2 15 〇〇0. 50 Image surface ------- Example 4 various information

21 • M363000 &lt;Example 5&gt; Fig. 6 shows a lens configuration diagram of the photographing lens of Example 5, and Table 5 shows lens data and various materials. The photographic lens of Embodiment 5 is sequentially composed of a first lens L1 of a biconcave lens, a second lens L2 of a biconvex lens, a third lens L3 of a lenticular lens, an aperture stop Bar, a fourth lens 双 of a biconcave lens, and a convex surface from the object side. The fifth lens L5 of the positive meniscus lens toward the image side and the sixth lens L6 of the lenticular lens are formed. [table 5]

Example 5 lens data

Si Ri Di Ndj vdj 1 -49.23 0.70 1.7725 49.6 2 5. 78 2. 50 3 17.06 2.20 1. 8679 40.2 —_ 4 -14. 38 1.28 5 9. 71 4. 50 1. 8348 42. 7 6 -9· 62 0. 10 ---- 18.9 7 (Aperture diaphragm) — 1. 17 h ——— 8 ---- -4.67 0. 70 1. 9229 9 ------ . , 9, 02 0.67 __ 10 -19.11 2.70 1.8348 ^ 42.7 -Li_ -4.70 0. 10 ______12 6. 52 2. 00 1· 7550 52.3 -1662. 50 3. 30 —~ .. -mu] 〇〇0. 40 1.5168 64.2 〇〇0. 50 ------ __1 elephant face - Example 5 various information

Table 6 shows values corresponding to the conditional expression (1) to the imaging lenses of Examples 1 to 5. In the first to fifth embodiments, the d line is set as the reference wavelength, and =6^22

Claims (1)

M363000 VI. Patent Application Range: 1. A photographic lens comprising, in order from the object side, a first lens having a concave surface facing the image side and having a negative power; a second lens having a positive power; a lens having a positive power; a light shed; a fourth lens being a 5-double concave lens and having a negative optical focus; a fifth lens 'having a convex surface toward the image side and having a positive & optical focus; and a sixth lens, The convex surface is oriented toward the object side and has a positive refractive power; the Abbe number of the material of the fourth lens to the d line is 3 〇 or less, and the focal length of the entire system is fm, and the synthesis of the fourth lens to the sixth 10 lens is described. When the focal length is f456, the following conditional formula (丨) is satisfied: 1.00&lt;f456/f&lt;1.88 (1). 2. The photographic lens according to claim 2, wherein the absolute value of the radius of curvature of the surface on the object side of the second lens is larger than the absolute value of the radius of curvature of the surface on the image side, The absolute value of the radius of curvature of the surface on the object side of the second lens is smaller than the absolute value of the radius of curvature of the surface on the image side, and the absolute value of the radius of curvature of the surface on the object side of the fifth lens is larger than the radius of curvature of the surface on the image side. The absolute value of the radius of curvature of the surface on the object side of the sixth lens is smaller than the absolute value of the radius of curvature of the surface on the side of the image 2〇. 3. The photographic lens according to the first or second aspect of the invention, wherein the radius of curvature of the surface on the object side of the fourth lens is r8, and the radius of curvature of the surface on the image side of the fourth lens is In the case of milk, the following clause (2) is satisfied: 27 M363000 〇.30&lt;|R8/R9|&lt;0.90&quot;. (2). 4. The photographic lens according to claim 1 or 2, wherein the distance from the object side surface of the lens closest to the object side to the optical axis on the image plane is L, and is set to be closest When the distance on the optical axis from the image side surface of the image side lens to the image surface 5 is Bf, the following conditional expression is satisfied: 〇.15 &lt; Bf / ( L - Bf) &lt; 0.25 (3). 5. The photographic lens of claim 2 or 2, wherein 'the focal length of the entire system is f', and the focal length of the fifth lens is f5, the following conditional expression (4) is satisfied: 10 1.20 &lt;f5/f&lt;1.5〇...(4). 6. The photographic lens of claim 2, wherein the air space on the optical axis of the second lens and the diaphragm is D6' § history of the light barrier and the fourth lens When the spatial interval on the optical axis is D?, 'the following conditional expression (5) is satisfied: 15 0.3&lt;D6/D7&lt;1.2... (5). The photographic lens according to the first or second aspect of the invention, wherein the focal length of the first lens is f1, and when the focal length of the second lens is f2, the following conditional expression (6) is satisfied. ): 〇.3&lt;|fl/f2|&lt;l.〇... (6). 8. A photographic apparatus comprising a photographic lens as described in claim 丨 or item 2. 28