TWM354075U - Photographic lens, camera module and photographing equipment - Google Patents

Description

M354075 V. New description: [New technical field] This is a photographic lens that images an optical image of an irradiated body on a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) camera. And a camera module that converts an optical image formed by the photographic lens into a photographic signal, and a digital camera or a camera-equipped mobile phone that carries the photographic lens for photography, and a personal digital assistant (PDA: personal Digital Assistance) device. 10 Prior Art 15 In recent years, with the spread of personal computers in general households, digital cameras that capture image information such as landscapes or portraits to personal computers have become popular. And ^ ' on the mobile phone to load the image input camera module on the eve of the use of this camera function on the device using CCD or 〇 s search for w%. In recent years, the miniaturization of these photographic elements has been demanded, and the photographic apparatus as a whole and the (4) ray mirror are also required to be miniaturized. The high pixelation of the photographic element is also progressing, and the surface resolution and high performance of the photographic lens are required. M354075 The requirements for the operation are as follows: for example, in order to reduce the number of parts, to reduce the size of the optical axis (the shortening of the optical axis direction), to reduce the price, and to increase the score, the number of lenses is set to four. In order to achieve high performance, we can consider the active use of aspheric surfaces. Patent Documents 1 to 4 disclose the use of an aspherical photographic lens which is constructed for such a four-micro-slice. [Patent Document 1] Patent Publication No. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ In the above-described photographing apparatus, it is required to limit the deterioration of optical performance to a minimum while considering mass production, and to reduce the length (= height) of the entire camera module in the optical axis direction. However, if the back focal length of the lens (the distance from the position closest to the image side of the lens to the image surface) is simply set too small, it is generally difficult to satisfy the standard of the light emission angle or the scratches and foreign matter on the surface of the final lens 15. Such as the appearance of the standard. Further, if the thickness DL (DL. total thickness of the lens = the distance from the vertex of the lens surface closest to the object side to the vertex of the most image side lens surface) is simply set too small, it is necessary to separate the lens elements. The center thickness D of the center is set too small to make the effect of the aspherical surface too strong. This causes deterioration of the manufacturing suitability due to the internal distortion of the lens shape at the time of molding, the 20-axis offset dumping, and the appearance standard. Therefore, in the case of shortening the total length of M354075, it is necessary to set the lens back focal length, the thickness DL of the lens system, the center thickness of each lens element, and the like, and to assemble them in a balanced manner under appropriate conditions, and maintain good in mass production. Optical performance. In the photographic lens described in the above Patent Document 1, since the light is blocked on the rear side of the second permeable mirror, if the total length is shortened, there is a problem that the light emission angle is likely to increase. Further, Patent Document 2 discloses various types of four-piece imaging lenses, but it is difficult to say that it is a very suitable design for each configuration example. For example, with respect to an embodiment of a type having a small focal length (representing a value before and after 4), the ratio of the total length to the focal length is greater than 125. The lens of the embodiment 1 other than the above is considered to have insufficient consideration of the manufacturability for the center thickness of the miniaturization or the like. In the imaging lens shown in Patent Document 3 and Patent Document 4, since the focal length, the total length, and the lens thickness of the embodiment are large, it is considered that the center of miniaturization of the imaging element has not been sufficiently considered in recent years. Manufacturability such as thickness. 15 [New content] This creation is based on the above situation, and its purpose is to provide a photographic lens that uses aspherical surface to maintain full-length shortening while maintaining high imaging ability and can produce a lens with good appropriateness. : M354075 and a photographic lens created by a camera model in which a photographic lens group and a photographic apparatus can obtain a high-resolution photographic signal are configured to have, in order from the object side, a first lens having at least a face-shaped aspherical shape. And the surface on the object side has a positive optical ability in the vicinity of the optical axis; the second lens has a concave side near the optical axis and has a negative optical power; the third lens has its optical axis; The concave surface is adjacent to the object side and is a positive f-shaped lens; the fourth lens 'is aspherical on both sides thereof, and the image side surface has a concave shape in the vicinity of the optical axis 10 and a convex shape in the peripheral portion and 'According to the following conditional formula: Ol^MIN (D) /f^ io ......(1) l.Omm^ R1 ^ 2.1 mm ..· ( 2) 0.3mm^ R8^ 1.5mm (3) -0.01 ( 1/ Mm) ^ 1/R7^0.4 ( 1/mm)......(4) 15 Where f is the focal length of the whole, MIN (D): the value of the smallest central thickness among the first to fourth lenses, R1: the paraxial radius of curvature of the surface of the object side of the first lens, R7: the fourth lens The paraxial radius of curvature of the surface on the object side, 20 M3 54075 is the radius of curvature of the near surface of the image side of the fourth lens, and the unit of f and MIN (8) in the equation (1) is set to follow. In the photographic lens of the present invention, a four-piece lens configuration is used as a whole, and the center thickness of the lens system is maintained in an appropriate range, and the aspherical surface is effectively used to optimize the shape of each lens, and the transmission meets predetermined conditions. In order to achieve manufacturability, the optimization of the lens configuration can be achieved while taking into consideration the manufacturability while achieving full-length shortening and high imaging performance. It is more advantageous for the shortening or imaging performance of the full length. In the photographic lens of the present invention, it is preferable to appropriately satisfy the following conditions.

3.0mm^ DL^ 4.0mm -10mm^ R5 ^ - 3.5mm —1.5mm^ R6^ — 0.5mm 〇.3mm^R8^ 1.0mm Here, DL: from the apex of the object side of the first lens to the fourth lens The distance on the optical axis of the apex of the imaging side; R5: the paraxial curvature of the surface of the object side of the third lens; M354075 R6: the paraxial radius of curvature of the image side surface of the third lens; R8··4th lens The paraxial radius of curvature of the side of the image side. Further, in the photographic lens of the present invention, the following conditional expression is satisfied as "2+u 3+")/3g 〇.. (8) 5 Here, u 1 : Abbe number of the first lens, y2 : Abbe number of the second lens, y3: Abbe number of the third lens, U4: Abbe number of the fourth lens. 10 15 The face is preferably a surface on the imaging side of the first lens from the center portion to the periphery, and the object side portion of the second lens does not have a concave shape of the inflection point. Moreover, the car father has a convex shape near the optical axis. Further, it is preferable that the first lens, the second lens, the brother lens, and the fourth lens are made of a resin material. By.彳. Conducive to the reduction of manufacturing costs, in order to achieve high performance, such as mirrors. The photographic image that constitutes the first-permeability lens, the camera of the five tigers The camera module according to the present invention includes: the photographic output of the present creation and the optical image-forming element formed by the photographic lens. M354075 Obtains a high-resolution photographic signal from which high-resolution photographic images can be obtained. [Embodiment] 5 The following describes the manner in which the creation is performed with reference to the drawings. Fig. 1 shows a first configuration example of a photographic lens according to an embodiment of the present invention. This configuration example corresponds to the first numerical embodiment (the lens configuration of FIG. 6 and FIG. 1) which will be described later. The same applies to the second to the first embodiment of the second to fifth numerical values which will be described later. The cross-sectional configuration of the five configuration examples is shown in Fig. 10 to Fig. 5. In Fig. 1 to Fig. 5, the symbol of the tiger element is the first one of the lens elements closest to the object side (the light barrier is the first) The curvature of the i-th surface of the symbol is attached in such a manner as to sequentially increase toward the image side (imaging side). The apostrophe Di represents the optical axis Z1 of the first and second +1 faces In addition, since the basic configuration of each configuration example is the same, the configuration example of the imaging lens shown in FIG. 1 will be described below as a basic configuration, and the configuration examples of FIGS. 2 to 5 are also performed as necessary. The photographic lens according to the present embodiment is applicable to various photographic apparatuses using photographic elements such as CCD or CMOS, in particular, relatively small portable terminal devices, for example, digital cameras, mobile phones with camera functions, 2 PDAs, and PDAs. Etc. This photographic lens, along the optical axis Z1 Side, comprising: 12

15 M354075 The light bar st, the first lens, the second lens L2, the third lens L3, and the fourth lens 匕4. A photographing element (not shown) such as a CCD is disposed on the imaging surface (photographing surface) Simg of the photographic lens. An optical cover cG such as an infrared cut filter or a low pass filter may be disposed between the fourth lens and the image forming surface (photographing surface) Simg for protecting the image forming surface. The diaphragm St is an optical aperture diaphragm, and is preferably disposed on the most near side of the object. Here, the "closest to the object side" indicates that the optical axis 21 is closer to the object side than the surface vertex position on the image side of the first lens U, and includes, for example, that the optical column St is disposed on the optical axis Z1. The case where the object side vertex position 10 is set, or the light block St is disposed between the surface vertex position of the first transparent object side and the surface vertex position of the image side. The light barrier is preferably disposed closer to the object side, for example, the surface vertex position on the object side of the first lens u and the edge position E of the object side surface of the first lens on the optical axis (refer to the figure) 1) can be between. The photographic lens, in particular, at least one surface of the first lens is aspherical, and both surfaces of the fourth lens L4 are aspherical. Preferably, each of the second lens L2 and the third lens L3 includes an aspherical surface at least in the plane. Here, in particular, when the aspherical shape is used, the second lens 2, the third lens L3, and the fourth lens L4 are more likely to have a complicated shape than the first lens u, and the shape is also likely to become large. Therefore, the second lens B2 and the third lens 13 20 M354075 are preferably composed of the resin material L3 and the fourth lens L4 in terms of workability or manufacturing cost. However, in order to achieve a high-performance lens L1, it is also possible. The composition of the material is better. When the manufacturing cost is emphasized, the first lens L1 is also made of a resin material and is made of a glass material. The first lens L1 has a positive optical power (the eighth lens U, and the surface on the object side is convex near the optical axis). Preferably, the image side surface has a convex shape in the vicinity of the optical axis, so as to have a biconvex shape in the vicinity of the wire. The second lens L2 has a negative optical power. The first: the red color 2, preferably the image side surface is in the light The vicinity of the shaft is a concave surface. The second transparent surface (10) has a concave shape in the vicinity of the optical axis of 10, and has a biconcave shape in the vicinity of the optical axis. In particular, the object-side surface of the second lens L2 is preferably from the center portion. a concave shape that does not have an inflection point (curved point) in the peripheral portion. However, as in the third configuration example of Fig. 3, the surface on the object side is formed into a convex shape in the vicinity of the optical axis. The first lens L3 has a positive meniscus lens with a concave surface facing the object side in the vicinity of the optical axis. The fourth lens L4 has a concave surface toward the image side in the vicinity of the optical axis. The aspherical surface having a convex shape toward the image side in the peripheral portion. The fourth lens L4, for example In the first configuration example of 圊i and the second configuration example of FIG. 2, the surface on the object side can be concave in the vicinity of the optical axis, so that the shape is biconcave in the vicinity of the optical axis of 20. Further, other configurations are possible. In the case of the light 14 M354075, the surface of the fourth lens L4 on the object side can be made convex in the vicinity of the axis in the vicinity of the optical axis. The photographic lens satisfies the following conditional expressions (1) to (4 Ol^MIN ( D) /f^L〇...(〇1.0mm^R1^2.1mm (2) 〇.3mm^ R8^ 1.5mm ( 3 )

-0.01 (1/mm) ^l/R7^〇.4 (i/mm) Here, f: overall focal length, 1〇MIN(D): the smallest among the first lens L1 to the fourth lens L4 The value of the thickness of the center of the heart, R1: the paraxial radius of curvature of the surface of the object side of the first lens L1, R7: the paraxial radius of curvature of the surface of the object side of the fourth lens L4, • R8: the image side of the fourth lens L4 The paraxial radius of curvature of the face. In the formula (1), f of the formula (1) and # of the MIN(D) are set to _〇 and it is preferable that the following conditional expression is satisfied as appropriate. 3 .Omm ^ DL ^ 4.0 mm ...... —1 Omm ^ R5 ^ — 3.5mm ..... (6) —1.5mm ^ R6 ^ — 0.5mm ...... i Ί ) 20 0.3mm^R8^ 1.0mm ..... r 〇. Λ 15 M354075 Here, DL : the distance from the apex of the object side of the first lens L1 to the optical axis of the imaging side apex of the fourth lens (refer to the figure)丨), R5. the paraxial radius of curvature of the object-side surface of the second lens L3, R6: the paraxial radius of curvature of the image side surface of the third lens L3, and R8: the near side of the image side surface of the fourth lens L4 The radius of curvature of the axis, and 'preferably satisfy the following conditional formula. Here, υ 1- ( υ 2+υ 3+y 4) /3^ 〇... (8) 10

15 u 1 : Abbe number of the first lens L1, u 2 : Abbe number of the second lens L2, D 3 : Abbe number of the third lens L3, L > 4: Abbe number of the fourth lens L4. Further, 'appropriately selected to preferably satisfy the following conditions. 0.6^ f3/f^ 0.8 ...... (9) (10) A 1.0S R1/R2S 0 fl/f^ 0.8

0.9^ ( R3+R4) / ( R3-R4) ^ 1>5 1.0^ fl2/f^ 1.6 ...... ( 13) 20 Here, 16 (12) M354075 f: overall focal length, fl : The focal length of the first lens L1, f3 : the focal length of the third lens L3, fl2 : the combined focal length of the first lens L1 and the second lens L2, 5 R1 : the paraxial curvature of the object-side surface of the first lens L1 R2: paraxial radius of curvature of the image side surface of the first lens L1, R3: paraxial radius of curvature of the object side surface of the second lens L2, R4: paraxial curvature of the image side surface of the second lens L2 radius. Fig. 22 is a view showing an example of a configuration of a camera module 1A in which the imaging lens of the present embodiment is assembled. Further, FIGS. 23(A) and (8) show a mobile phone having a camera function as an example of a photographing device in which the camera module of FIG. 22 is mounted. The camera-equipped mobile phone shown in Figs. 23(A) and (B) is provided with an upper casing 2A and a lower casing 2B, and both of them are configured to be rotatable in the direction of the arrow of _(A). An operation key 21 or the like is provided in the lower casing 2B. The upper casing 15 body 2A is provided with a camera unit 1 (Fig. 23(B)), a display unit 22 (Fig. 23(A)), and the like. The display unit 22 is composed of a display panel such as an LCD (Liquid Crystal Panel) or an Ekctr® scence panel. The display unit is disposed on the side that becomes the inner surface at the time of folding. In addition to the various function tables relating to the tongue force, the display unit 22 can display an image of 17 M354075 or the like that is imaged through the camera unit 1. The camera unit 1 is disposed, for example, on the inner surface side of the upper casing 2A. However, the position of the camera unit 1 is not limited thereto. The camera unit 1 includes the camera module of the present embodiment. The camera module includes a lens barrel 3 that houses the imaging lens 20, and a support lens barrel 3 as shown in FIG. a support substrate 4 of 5; an image pickup element (not shown) provided on the support substrate 4 at a position corresponding to the image forming surface of the photographing lens 2q. The camera module further includes: a photographing element electrically connected to the support substrate 4 The flexible substrate 5 and the external connection terminal 6 are electrically connected to the flexible substrate 5, and can be electrically connected to a signal processing circuit on the terminal body side of a terminal device such as a camera having a camera function. These 10 constituent elements are integrally formed. In the camera module shown in FIG. 22, the optical image formed by the photographic lens 2 is converted into an electrical photographic signal by the photographic element, and the photographic signal is output to the photographic setting via the prismatic substrate 5 and the external connection terminal 6. A signal processing circuit on the main body side. Here, in the camera module, the imaging lens according to the present embodiment is used as the imaging lens, so that a high-resolution imaging signal in which aberrations are sufficiently corrected can be obtained. A high-resolution image can be generated on the main body side of the photographing apparatus according to the s-photography signal. The photographing apparatus involved in the present palladium mode is not limited to a camera-equipped mobile phone, such as a digital camera or a pDA. 18 M354075 Next, the operation and effect of the photographic lens configured as described above, and in particular, the action and effect of the conditional expression will be described in more detail. In the photographic lens according to the present embodiment, each of the four lens configurations is used. The center thickness of the lens is maintained in an appropriate range, and the aspherical surface is efficiently used to optimize the shape of each lens, and the lens configuration is optimized by satisfying a predetermined conditional expression. To achieve high-definition shortening and high imaging performance while making the cost constant, the aspheric shape is especially The fourth lens L4 is changed into a different shape at the center portion and the peripheral portion 10, and the curvature of field (image surface curvature) is well corrected from the central portion of the image plane to the peripheral portion. In the fourth lens "with the first lens u" Compared with the second lens L2 and the third lens L3, the light beam is separated from each angle of view. Therefore, the image side surface of the fourth lens L4, which is the final lens surface closest to the image pickup element, has a concave shape toward the image side in the vicinity of the optical axis, and has a convex shape toward the image side 15 in the peripheral portion, so that the angle of view can be appropriately corrected. Aberration, beam to photography element

The incident angle of the piece is controlled to be below the fixed angle. Therefore, correction of field curvature or distortion can be favored while reducing the amount of light unevenness in the entire area of the S image plane. , telecentricity (in the case of ρ seven incident angle with respect to light in the photographic lens system, preferably y 7 eve) is close to parallel to the 19 M354075 axis of the chief ray of the photographic element (incident angle at the photographic surface relative to photography) The normal of the face is close to zero). In order to ensure this telecentricity, it is preferable that the light stop St is disposed on the object side as much as possible. On the other hand, if the light stop st is disposed at a position away from the lens surface of the object side of the first lens L1 toward the object side, the portion (the distance between the light intercept & 5 and the lens surface of the most sinful object side) Since the optical path length is added, it is disadvantageous in terms of miniaturization of the overall configuration. Therefore, the light column 8 is disposed on the optical axis zi at the same position as the vertex position of the object side lens surface of the first lens u, or at the surface vertex position and the image side of the object side of the first lens u. Between the vertex positions of the faces, 彳 achieves a full-length shortening of 10' and ensures telecentricity. When the telecentricity is further emphasized, the diaphragm St is placed on the optical axis on the surface vertex position on the object side of the first lens and the edge position E on the object side surface of the first lens L1 (see FIG. You can do it. Hereinafter, the specific meaning of each conditional expression will be described. 15 Conditional Formula (1) specifies the center thickness of the lens unit. In this photographic lens, aspherical surfaces are actively used for achieving high performance. The aspherical surface contributes to miniaturization and high performance, but in the case of injection molding or molding, it is a lens product that can stably form a good quality, and can appropriately maintain the fluidity of the molding material or the molding. It is necessary to consider the specified processing conditions for injection pressure and pressure retention. If the upper limit of conditional expression (1) is exceeded, then 20

l 〇 Value Conditional Formula (2) The radius of the paraxial curvature of the surface on the object side of the first lens Lut. In order to maintain the full length, viewing angle, and shooting angle to be appropriate, M354075 ^ facilitates lens miniaturization. If the lower limit is exceeded, it is not good to prevent the transfer of the surface shape of the material from the movement of the material & In order to achieve miniaturization and to make the manufacturing suitability better, the numerical range of the conditional expression (1) is preferably: O.ll^MIN (D) /f^〇.5 ...... ( Γ More preferably: υ.12^ΜΙΝ (D) /f^〇.5 The optical capacity of the first permeable 1 and the curvature of the front surface of the first lens U give a large influence. When the upper limit of the conditional expression (1) is exceeded, there is a tendency that the _' lens emission angle which is disadvantageous to the shortening of the entire length is deteriorated. Further, when the lower limit is exceeded, there is a phenomenon in which the spherical aberration and the peripheral ray (four) are different (the force d component is deteriorated. The conditional expression (3) is about the paraxial radius of curvature R8 of the surface on the imaging side of the fourth lens (10). Moreover, the conditional expression (4) The paraxial radius of curvature R7 of the surface of the object_ of the fourth lens ^. The two equations of the conditional expression (1) and the conditional expression (4) indicate the effect of multiplication. In the conditional expression (3) and the conditional expression (4) The bending condition of the four lens L4 is such that the balance of the image field curvature of the intermediate viewing angle between the image plane of the main connecting corner (隅) 2〇 and the best image plane on the axis is good. If the conditional expression (1) is exceeded. Or ^ The upper limit of the conditional formula U) is like the % bowing easy to negative side (7 y, one, sub- and 歪 易 easy to negative side. If super (' then the field curvature is easy to be positive side (only ~ positive side )) and the distortion is easy to bias 5 In order to get better performance, the strip is better than ^^. The value range of the warranty type (3) is better.

〇-3mm^R8^i.〇mm, conditional expression (5) regarding the thickness of the lens system on the optical axis. In order to satisfy the following two requirements, namely, the total length of the shortening lens and the fact that the final lens surface closest to the photographic element is not so close to the photographic surface, it is necessary to set the thickness DL of the lens system to an appropriate range. If the upper limit of the conditional expression (5) is exceeded, it is disadvantageous for the shortening of the full length. When the thickness is shortened by the thickness DL', the deterioration of the aberration performance and the sharp decrease in the manufacturing assembly sensitivity (sensitivity) 15 occur when the thickness DL' is excessively reduced by the lower limit of the conditional expression (5). In order to shorten the overall length and obtain better performance, the numerical range of conditional formula (5): 3.0mm^ DL ^ 3.8mm ...... (5,) is ideal. More desirably: 20 3.0mm ^ DL^ 3.5mm ...... (5''). 22 M354075 Further, it is preferable that the conditional expression (5) satisfies the following conditions. 0.85^ DL/f^ 0.93 , ...... (14) In order to shorten the overall length, it is better to pass the white 丄 2 k to achieve better performance. The value range of conditional formula (14) is preferably: 0.85^ DL /f^ 0.92 f , ...·.·(14,) More preferably: 0-87^ DL/f^ 〇.9〇( , ......(14''). Conditional formula (6 Regarding the first: broadcast on τ. ^ λ The paraxial surface of the object side of the music lens L3 has a paraxial curvature of half light R5. Moreover, the condition 戎 γ 1 and the day 弋 (7) regarding the image side of the third lens L3 10 15 20-degree paraxial radius of curvature R6. The effect of multiplication is shown in the two formulas: the rhododendron r, the remaining part (6) and the conditional formula (7). In equation (7), the curved path of the third lens L3 is expressed in a one-week condition, so that the balance between the image plane of the main connecting plane corner and the image plane of the intermediate viewing angle between the axes is Good. If the upper limit of the conditional expression (6) or the strip '·, , ^ and the condition (7) is exceeded, the curvature of the field is easily biased to the positive side, and the total distortion is #丁/, and the positive curve is easy to be positive. Above the lower limit, the field curvature tends to be negative side and is distorted The conditional expression (4) defines the dispersion (dispersion) of each lens, satisfies the value range, and sets the Abbe number 第一 of the first lens L1 to be relatively large, thereby abolishing the reduction of the axial chromatic aberration. The lower limit of the formula (8) is corrected for the axial chromatic aberration. 23, M354075 To better correct the chromatic aberration, it is preferable to further satisfy the following conditions. ' U Bu "3+y 4) /2g5 ...... (8,) The conditional expression (8) is satisfied, and for example, a material having a relatively large dispersion is used in the third lens L3 and the fourth lens 5 L4, which is advantageous for the correction of the chromatic aberration of magnification. Regarding the focal length f3 of the third lens L3, if the upper limit of the conditional expression (9) is exceeded, there is a tendency for the angle of incidence of the light to become a pure angle. If the lower limit of the conditional expression (9) is exceeded, the image field of the intermediate viewing angle is excessively curved. The conditional expression (10) specifies the paraxial angle of the first lens (four) on the object side and the imaging side surface, and the relationship between the half lion and the R2 is out of the conditional expression (the upper limit of (8) is especially spherical aberration. Larger positive side. If the lower limit is exceeded, especially spherical aberration The ground side is negative. 15 In order to obtain better performance, the value range of conditional formula (1)) is smaller than the focal length fi of conditional equation (11) with respect to the first lens L1 ^ mL1. If the upper limit of conditional u 1) is exceeded, it is zooming out. The full-length square J is unfavorable. If the lower limit is exceeded, 24 M354075 the beam width after the second lens L2 becomes larger, the image field f is easy to be larger toward the negative side, and it is particularly difficult to correct the coma aberration in order to obtain a better one. For the performance, the range of values of the conditional formula (η) is preferably: 5 fl/f^ 0.73 ...... (11,) More preferably: _ fl/f^ 0.6 ...... ( u'' ) Just fine. The conditional expression (12) relates to the shape of the second lens [2]. If the conditional expression (the upper limit of (1) is exceeded, it is not advantageous to reduce the angle of incidence of the light. If the lower limit is exceeded, the sensitivity of each axis of the first lens L1 and the second lens L2 becomes large, which is not satisfactory for proper manufacture. The conditional expression (13) relates to the combined focal length of the first lens u and the second lens ^. If the conditional expression (the upper limit of (1) is exceeded, it becomes the anti-distance type (the direction of the end of the mouth) The main point (main point) is shifted by 15 toward the image side. Therefore, it is difficult to shorten the total length according to the principle. If the lower limit is exceeded, the tangent image surface tends to be too small. Further, the amount of peripheral light tends to be too small. For better performance, the value range of conditional formula (13) is discarded 20 13, 25 M354075. More preferably: ^1^'127^1·2 ·.·... U3,,). As explained above According to the imaging lens of the present embodiment, it is possible to realize the imaging performance while achieving the shortening of the entire length, and to maintain the image forming performance, and to realize the lens which is excellent in the appropriateness of the manufacturing. ^, ', ,, and According to the 10 camera module of the present embodiment, A photographic signal corresponding to an optical image formed by a photographic lens having a short length and a high imaging performance, so that miniaturization as a 4 m body can be achieved, and a high-resolution photographic signal can be obtained. By mounting the camera module, the photographic image portion can be miniaturized, and a high-resolution photographic signal can be obtained, and a high-resolution photographic image can be obtained based on the photographic signal. The specific numerical example of the imaging lens according to the present embodiment will be described. The following describes the numerical implementation of the fifth to fifth embodiments. Fig. 6 and Fig. 11 show the photography corresponding to the image shown in Fig. The "body lens" of the structure of the lens. In particular, the basic lens data is shown in Fig. 6, and the information about the aspheric surface is shown in Fig. 11. The face number of the lens data shown in Fig. 6 is represented by 襕In the image transmission 35 according to the first embodiment, the surface of the lens element closest to the body side of the object M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M The number of the first face of the symbol is attached to the face of the curvature radius Ri, and the value of the radius of curvature of the first face from the object side (mm) is indicated in the column of the radius of curvature Ri. The intercept 5 of the opposite surface interval Di also represents the interval (mm) on the optical axis of the first solid surface Si and the i+th surface Si+Ι from the object side. The Nj block represents the jth optical from the object side. The value of the refractive index of the element's confrontation line (5 87.6 nm). The value of the Abbe number of the j-th optical element from the object side is represented by 一 #一拦. The data indicates the value of the focal length f (mm) of the entire system. 10 In the photographic lens of the first embodiment, the first lens L1 to the fourth lens L4 are all made of a resin material. In the imaging lens according to the first embodiment, both surfaces of the first lens L1 to the fourth lens L4 have an aspherical shape. In the basic lens data of Fig. 6, the radius of curvature of these aspherical surfaces indicates the value of the radius of curvature of the vicinity of the optical axis. The aspherical surface data of the photographing lens of the first embodiment is shown in Fig. 11 . In the numerical value shown as aspherical data, m T,5 唬Ε 唬Ε 不 其 其 其 其 其 其 其 数值 数值 数值 表示 表示 m m m m m m m m m m m m m m m m m m m m The value is multiplied by the value before "Ε". For example, if it is "1〇Ε 20 - 02", it means "1.0χ1〇-2". 27 M354075 The value of each coefficient Ai, K in the equation of the aspherical shape represented by the following formula (A) is entered as the aspherical material. In detail, z represents the length (mm) of the perpendicular line drawn from the point on the aspheric surface at a position away from the optical axis height h to the aspherical vertex. The _ plane (the plane perpendicular to the optical axis). In the photographic lens of the first embodiment, each aspherical surface is expressed as an aspheric coefficient ^ which is effective by using the coefficient of the third to the first order from 3 to 八〇. • Z=C.h2/{l+ ( 1 —K.C2.h2)丨/2}+Σ Ai.hi ......(A) Here, Z: the depth of the aspheric surface (mm), 10 h: from the light Distance from the shaft to the lens surface (height) (mm) K: eccentricity,

C : paraxial curvature = 1 / R (R: paraxial radius of curvature), • Ai : aspheric coefficient of the yoke (丨 is an integer of 3 or more). 15 Like the photographic lens of the first embodiment, the specific lens data corresponding to the configuration of the photographic lens shown in FIG. 2 is taken as the second embodiment, and is shown in FIG. 7, and FIG. 12 and 'will also correspond to FIG. 3 to FIG. The specific lens data of the configuration of the photographic lens shown in Fig. 5 is shown in Figs. 8 to 10 and Figs. 13 to 15 as Examples 3 to 5. In the second to fifth embodiments, as in the case of the photographic lens of Example 28, M354075, the first surface of the first lens Τ 1 $ 哲. The lens L1 to the fourth lens L4 are all aspherical. Further, in the second to fifth embodiments, the first lens L i to the fourth lens L4 are all made of a resin material. 5 ❿® 1 6 ' is a summary of the values of the above basic conditional expressions (1) to (14) and other conditional expressions (8,) for each of the embodiments. As shown in Fig. 16 , the conditional expression (1) i (1) is in the numerical range in which all the examples are in the conditional expression. Fig. 17 (A) to Fig. π (C) respectively show spherical aberration, astigmatism, and distortion (distortion aberration) of the photographing 10 lens in the embodiment. In each aberration diagram, the aberration of the reference wavelength is not taken by the e-line (546.07 nm). In the spherical aberration diagram and the astigmatism diagram, the aberrations on the F line (wavelength 486 13 nm) and the c line (wavelength 656.27 nm) are also shown. In the astigmatism diagram, the solid line indicates the sagittal direction (s), and the broken line indicates the aberration of the tangential direction (T). FNo. indicates the F value and Y indicates the 15 image height. Similarly, Figs. 18(A) to 18(C) show aberrations with respect to the photographic lens of the second embodiment. Similarly, FIGS. 19(A) to 19(C) show aberrations with respect to the photographic lens of Embodiment 3, and FIGS. 2(a) to 20(C) show images of the photographic lens of Embodiment 4. Poor, Fig. 21 (A) to Fig. 21 20 (C) show aberrations of the photographic lens of Example 5. 29

M354075 As can be seen from the above numerical data and various aberration diagrams, high imaging performance can be achieved while shortening each embodiment. Further, the present creation is not limited to the above embodiment and each embodiment, and various shapes may be employed. For example, the values of the radius of curvature, the interplanar spacing, and the refractive index of each lens component are not limited to the value of the financial value (IV) at the above numerical values, and other values may be adopted. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a first embodiment of a photographic lens according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing a second configuration example of the photographic lens of the embodiment of the invention. Fig. 3 is a cross-sectional view showing a third embodiment of the photographic lens according to the embodiment of the present invention, which corresponds to the lens of the third embodiment. Fig. 4 is a cross-sectional view showing a lens of a fourth embodiment of the photographic lens according to the embodiment of the present invention. Fig. 5 is a cross-sectional view showing a fifth configuration example of the imaging lens according to the embodiment of the present invention, and corresponds to the lens of the fifth embodiment. Fig. 6 is a view showing basic lens data of the photographing lens of the first embodiment of the present invention. Fig. 7 is a view showing basic lens data of the photographing lens of Example 2 of the present invention. The configuration example is a configuration example of the fourth embodiment, and is a pair of 30 20 M354075. Fig. 8 is a view showing the basic lens data of the imaging lens of the third embodiment of the present invention. Fig. 9 is a view showing the basic lens data of the photographic lens of the fourth embodiment of the present invention. Fig. 10 is a view showing the basic lens data of the photographic lens of the fifth embodiment of the present invention. Fig. 11 is a view showing the material relating to the aspherical surface of the photographic lens of the first embodiment of the present invention. Fig. 12 is a view showing information relating to the aspherical surface of the photographing lens of the second embodiment of the present invention. Fig. 13 is a view showing information relating to the aspherical surface of the photographing lens of the third embodiment of the present invention. K) Fig. 图 is a view showing information relating to the aspherical surface of the photographing lens of Example 4 of the present creation. Fig. 15 is a view showing information relating to the aspherical surface of the photographing lens of the fifth embodiment of the present invention. Fig. 16 is a view showing a summary of values relating to conditional expressions for each embodiment. Fig. 17 is a diagram showing aberrations of aberrations of the imaging lens of Example 1 of the present invention, (Α) spherical aberration, (Β) astigmatism, and (c) saturation. Fig. 18 is an aberration diagram of aberrations of the imaging lens of Example 2 of the present invention, (Α) spherical aberration, (8) astigmatism, and (c) distortion. Fig. 19 is an aberration diagram of coma aberration of the image pickup lens of Example 3 of the present invention, 2 〇 (Α) spherical aberration, (8) astigmatism, and (c) distortion. 31 M354075 FIG. 20 is an aberration diagram of aberrations of the imaging lens of Example 4 of the present invention, (A) spherical aberration, (B) astigmatism, and (C) distortion. Fig. 21 is a diagram showing aberrations of aberrations of the imaging lens according to Example 5 of the present invention, (A) spherical aberration, (B) astigmatism, and (c) distortion. Fig. 22 is a perspective view showing a configuration example of a camera module of the present invention. Fig. 23 is a perspective view showing a configuration example of the photographing apparatus of the present invention. 10 [Main component symbol description] L1 first lens L2 second lens L3 third lens L4 fourth lens

St aperture diaphragm Z1 optical axis CG optical component E edge position 1 camera section 21 operation key 2A upper housing 3 lens barrel 5 flexible substrate R1 from the object side R2 from the object side

Imaging surface of the Simg photographic lens (photographic surface) Total thickness of the DL lens system 20 Photographic lens 22 Display portion 2B Lower housing 4 Support substrate 6 External connection terminal Value of curvature radius of the first surface The radius of curvature of the second surface Value 32 M354075 R3 From the object side, the value R4 of the radius of curvature of the third face is calculated from the object side, and the value R5 of the radius of curvature of the fourth face is calculated from the object side, and the radius of curvature of the fifth face is The value R6 is calculated from the object side, and the value of the radius of curvature of the sixth face R7 is calculated from the object side, and the value of the radius of curvature of the seventh face is R8 from the object side, and the value of the radius of curvature of the eighth face is - R9 is the value of the radius of curvature of the first surface from the object side, and the value of the radius of curvature of the first surface from the object side. • D0 aperture diaphragm and light from the first side from the object side. The interval D1 on the axis is calculated from the object side, and the interval D2 on the optical axis of the second surface and the second surface is calculated from the object side, and the interval D3 on the optical axis of the second surface and the third surface is from On the object side, the interval D4 on the optical axis of the third surface and the fourth surface is the optical axis of the fourth surface and the fifth surface from the object side. The interval D5 from the object side, the interval D6 on the optical axis of the fifth surface and the sixth surface is from the object side, and the interval D7 on the optical axis of the sixth surface and the seventh surface is from the object side. In the calculation, the interval φ D8 on the optical axis of the seventh surface and the eighth surface is calculated from the object side, and the interval D9 on the optical axis of the eighth surface and the ninth surface is counted from the object side, and the ninth The interval D10 on the optical axis of the face and the second face is the interval 33 on the optical axis of the first and second faces from the object side.

Claims (1)

M354075 WT:12.—2 5;:^:Γ| i JJ. [Year/1 R II j is still filled I. VI. Patent scope: 1 type of lens~ lens, including: from the object side: first lens ,:& δ small-r- « ” ^ One side is aspherical, and the surface on the object side is convex near the optical axis. It has a positive optical power. The first lens has a surface on the image side. The vicinity of the light vehicle is concave and has a negative optical power; φ the first lens, which has a concave surface toward the object side near the optical axis, and is a positive meniscus lens; 15 The fourth lens has an aspherical shape on both sides, and the image side surface has a concave shape in the vicinity of the optical axis and a convex shape in the peripheral portion, and is configured to satisfy the following conditional formula: Ol^MIN (D) /^! .〇...(ι) 1.0mm^R1^2.1mm ( 2) 0.3mm^ R8^ 1.5mm ., -0.01 (1/mrn) Mine Ho""- (4) Here, 20 value f: overall focal length; MIN (D): R1 of the smallest central thickness among the first to fourth lenses: paraxial radius of curvature of the object-side surface of the first lens; 34 M354075 97.12. 2 5 years E1 ---- || Jgj R7: paraxial radius of curvature of the object-side surface of the fourth lens; R8 · paraxial radius of curvature of the image side surface of the fourth lens; and, units of f, MIN(D) in the formula (1) K.mm. 2. The photographic lens described in the scope of claim 2, wherein the following conditional formula is satisfied in 5 steps: (6) (7) 10 3.0mm^ DL^ 4.0mm A lOmmg R5S - 3.5mm A 1.5mm$R6S -0.5mm 〇.3mm^R8^ 1.0mm Here, DL: from the apex of the object side of the first lens to the image side of the fourth lens The distance on the optical axis of the vertex; R5: the paraxial radius of curvature of the surface of the third lens on the object side; R6. the paraxial radius of curvature of the image side surface of the third lens; 15 R8. Image side of the fourth lens The paraxial curvature of the face is half-checked. 3. The photographic lens according to claim 1, wherein the following conditional expression is satisfied: 3.0 mm^ DL^ 4.0 mm (5) wherein DL: an apex from the side of the object of the first lens The distance to the optical axis of the 20-side apex of the fourth lens. 35 M354075 4. The photographed as described in item 1 of the patent application is sufficient for the following condition: A shadow lens in which R5 ^ — 3.5 mm (6) where R5 is a paraxial radius of curvature of the object-side surface of the third lens. 5. The photographic lens of claim 1, wherein the conditional expression is sufficient: 1 · 5ηιηι^ R6^ A 0.5mm (7) where R5 is the paraxial radius of curvature of the object-side surface of the third lens. The photographic lens, wherein the object-side surface of the second lens having no central portion to the peripheral portion is a concave shape from the inflection point. 7. If you apply for a patent brain! The photographic lens 'where' described in any one of item 5 further satisfies the following conditional formula: ^ 1-( κ 2+^ 3+y 4) /3>〇... (8) Where, U 1 : Abbe number of the first lens, u 2 : Abbe number of the second lens, U 3 : Abbe number of the third lens, U4: Abbe number of the fourth lens. A lens according to any one of claims 1 to 5, wherein the image side surface of the first lens has a convex shape in the vicinity of the optical axis. A camera module comprising: .5 a photographic lens as recited in any one of claims 1 to 5; and/or an output of the _element formed by the photographic lens The corresponding photographic signal of the optical image. The invention relates to a photographic apparatus, which comprises: 10 a camera module as claimed in claim 9 of the patent application. 37