JP2014191032A - Camera module and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera module that can dissolve a problem of color shading and a problem of a ghost even with a small size, and to provide a portable terminal using the camera module.SOLUTION: Unnecessary frequency light such as an infrared ray included in subject light is cut by forming an infrared cut coat IRC on an image side surface 13a of a third lens L3 of an imaging lens 12. Since the image side surface 13a of the third lens L3 has a convex surface on an image side, an angle of incidence can be made close with respect to light advancing to a center of an imaging plane 11a of an image pickup element 11 and light advancing to a periphery of the imaging plane 11a, and thus, dependency on an angle of the infrared cut coat is overcome and color shading can be effectively suppressed. Further, since an optical element 14 having an anti-reflection coat ARC formed is arranged between the imaging lens 12 and the image pickup element 11, a reflection upon the optical element 14 is suppressed, therefore, a ghost is effectively suppressed. Further, the image pickup element 11 is covered by the optical element 14, thereby a dust and the like can be suppressed from being adhered on the imaging plane.

Description

  The present invention relates to a small camera module using an image sensor such as a CCD type image sensor or a CMOS type image sensor, and a portable terminal using such a camera module.

  In recent years, as mobile terminals equipped with camera modules using solid-state image sensors such as CCD (Charge Coupled Device) type image sensors or CMOS (Complementary Metal Oxide Semiconductor) type image sensors have increased in popularity, higher-quality images have been developed. In order to obtain the above, those equipped with a camera module using an image sensor with a high number of pixels have been supplied to the market. As mobile terminals, thin smartphones and the like are becoming mainstream, and in response to this, demands for further miniaturization of camera modules are increasing.

  By the way, in the conventional camera module, an infrared cut filter is installed between the image pickup element and the image pickup lens, so that unnecessary frequency light other than visible light (mainly infrared light) is generally blocked. is there. Here, as shown in FIG. 1, the reflection-type infrared cut filter IF, which is currently mainstream, generates a reflective film IRC that reflects infrared light on the surface of the transparent glass substrate ST, and reflects unnecessary frequency light to cut it. It is the structure to do. However, in FIG. 1, the reflection film IRC on the infrared cut filter IF is changed by the difference in the incident angle between the light beam LB1 toward the center of the imaging surface of the image sensor below the infrared cut filter IF and the light beam LB2 toward the periphery of the imaging surface. When the optical path length of the light beam passing therethrough changes, there is a problem that the reflection characteristics thereof change and color shading occurs.

  Such a problem is due to the angle dependency of the reflective film IRC. According to the characteristics of the reflective film shown in FIG. 2, the infrared light is reflected at an incident angle of 25 degrees (obliquely incident on the infrared cut filter IF) as compared to an incident angle of 0 degrees (incident perpendicular to the infrared cut filter IF). This is because the range shifts to the short wavelength side. This phenomenon is called the angle dependency of the reflective film.

  On the other hand, in order to suppress color shading, an infrared cut filter is also configured by using glass mixed with an absorbent that absorbs unnecessary frequency light. However, the infrared absorption characteristics of this type of infrared cut filter do not depend on the angle of incident light, but tend to depend on the thickness of the infrared cut filter. Therefore, it is easy to adopt in a digital camera that can relatively secure the thickness in the optical axis direction, but in the camera module for mobile terminals, miniaturization is strictly demanded, so the infrared cut filter must be made thin, There is a problem that sufficient absorption characteristics cannot be obtained.

  On the other hand, a hybrid type infrared cut filter in which a reflective film is applied to glass in which an absorbent is mixed has attracted attention (see Patent Document 1). As shown in FIG. 3, the hybrid type infrared cut filter has an advantage that it has a sufficient infrared cut function even if it is thin, as well as being effective in suppressing color shading because it has little angle dependency.

  However, in addition to being relatively expensive, the hybrid type infrared cut filter has another problem described below. Like the reflection type infrared cut filter, the hybrid type infrared cut filter has a reflective film on the surface of the glass. Therefore, as shown in FIG. For this reason, the light beam LB3 reflected from the object side surface is incident again on the flange portion FL of the imaging lens LS, and is transmitted through the imaging lens LS and reflected from the object side surface. When the incident angle is close to, the infrared cut filter IF is passed, and as a result, a ghost incident as unnecessary light on the imaging surface IP of the imaging element SN often occurs. In addition, a light beam that forms an image on the outside of the imaging surface may be reflected by the reflection film and may enter the imaging surface through a similar path to generate a ghost. Furthermore, as shown in FIG. 5, there is a ghost that is generated when the light beam LB4 reflected by the imaging surface IP of the imaging element SN is reflected again by the image side surface of the infrared cut filter IF and re-enters the imaging surface IP. Such a ghost is more likely to occur as the distance between the imaging surface IP and the infrared cut filter IF is closer, that is, more likely to occur in a camera module for a portable terminal that is required to be thin.

  In order to solve the above-described problem of color shading, in Patent Document 2, a member having a convex surface facing the image side is disposed immediately before the image sensor object side, and an infrared cut coat is applied to the member.

JP 2012-185468 A Japanese Unexamined Patent Publication No. 2005-101911

  According to the configuration of Patent Document 2, since an infrared cut coat is applied to a member having a convex surface facing the image side, the incident angle of the light beam toward the center of the imaging surface of the image sensor and the light beam toward the periphery of the imaging surface The difference can be reduced, thereby overcoming the angular dependence of the reflective film IRC and suppressing color shading. However, the technique of Patent Document 2 still has a problem that the ghost described with reference to FIGS.

  The present invention has been made in view of such problems, and provides a camera module that can solve the problem of color shading and the ghost while being small in size, and a portable terminal using such a camera module. For the purpose.

In order to solve the above problem, a camera module according to claim 1 is provided.
A plurality of imaging lenses for forming a subject image;
An image sensor that photoelectrically converts a subject image formed by the imaging lens;
In a camera module having an optical element disposed between the imaging lens and the imaging element,
When a principal ray having the maximum image height on the imaging surface passing through the imaging lens is incident on the optical element, an angle formed by the normal of the incident surface of the optical element and the principal ray at the incident position is θ1. ,
For each optical surface of the imaging lens, when the principal ray of each angle of view has a maximum value of the angle between the normal of the optical surface at the incident position and the principal ray, respectively θ2,
An infrared cut coat is formed on any one of the optical surfaces of the imaging lens where θ1> θ2 is satisfied, and an antireflection coat is formed on the optical element.

Moreover, in order to eliminate the said subject, the camera module of Claim 2 is
A plurality of imaging lenses for forming a subject image;
An image sensor that photoelectrically converts a subject image formed by the imaging lens;
In a camera module having an optical element disposed between the imaging lens and the imaging element,
When a principal ray having an arbitrary image height on the imaging surface that passes through the effective diameter excluding the optical axis of the imaging lens is incident on the optical element, the normal of the incident surface of the optical element at the incident position And the angle between the principal ray and θ1
When the chief ray of the same image height on the imaging surface is incident on the optical surface of the imaging lens, when the angle between the normal of the optical surface at the incident position and the chief ray is θ2,
An infrared cut coat is formed on any one of the optical surfaces of the imaging lens where θ1> θ2 is satisfied, and an antireflection coat is formed on the optical element.

The present inventor considered whether the problem of color shading and the problem of ghost could be solved from a viewpoint different from the conventional one. First, unnecessary frequency light may be cut at any position before entering the imaging surface of the imaging device. Therefore, in the present invention, an infrared cut coat is formed on any optical surface of the imaging lens. However, as described above, the infrared cut coat has angle dependency. Here, since the optical surface is generally a curved surface, by appropriately selecting the optical surface on which the infrared cut coat is to be formed, a light beam traveling toward the center of the imaging surface of the image sensor and a light beam traveling toward the periphery of the imaging surface Thus, the incident angle can be made closer, and the problem of the angle dependency of the infrared cut coat can be alleviated. For example, a convex surface on the image side and a concave surface on the object side meet this condition. Generalizing the appropriate optical surface to form an infrared cut coat,
(1) When a principal ray having the maximum image height on the imaging surface that passes through the imaging lens is incident on the optical element, an angle formed by a normal line of the incident surface of the optical element at the incident position and the principal ray is θ1, With respect to each optical surface of the imaging lens, the maximum value of the angle between the principal ray of each optical field angle from the vicinity of the optical axis to the peripheral portion and the principal ray at the incident position and the principal ray is θ 2. Then, among the optical surfaces of the imaging lens, an optical surface that satisfies θ1> θ2.
Or
(2) When a principal ray having an arbitrary image height on the imaging surface that passes through the effective diameter excluding the optical axis of the imaging lens is incident on the optical element, the normal of the incident surface of the optical element at the incident position The angle between the principal ray and the principal ray is θ1, and when a principal ray having the same image height on the imaging surface is incident on the optical surface of the imaging lens, the angle between the normal of the optical surface and the principal ray at the incident position is θ2. , An optical surface that satisfies θ1> θ2.
Color shading can be effectively suppressed by forming an infrared cut coat on one of the optical surfaces of such an imaging lens. The details of the infrared cut coat are described in, for example, International Publication WO2009 / 157310. The principal ray is a ray at each angle of view that passes through the center of the aperture stop.

  However, even if color shading can be effectively suppressed, the problem of ghost due to reflection from the optical element disposed between the imaging lens and the imaging element remains in order to prevent dust and the like from adhering to the imaging surface. . Therefore, in the present invention, an antireflection coating is formed on the optical element disposed between the imaging lens and the imaging element. Thereby, since reflection at the optical element is suppressed, the ghost shown in FIGS. 4 and 5 is effectively suppressed. Further, since the optical surface on which the infrared cut coat is formed can be arranged at a position farther from the image sensor than in the past, the influence of the reflected light is small. In the present invention, the reflectance of the optical element in the visible light region is preferably suppressed to 2% or less by forming an antireflection coating. Moreover, it is more preferable if the reflectance is 1% or less in the visible light and infrared light regions. The antireflection coating can be formed of, for example, a dielectric multilayer film.

  According to a second aspect of the present invention, in the camera module according to the first aspect, the optical element is a parallel plate.

  When the optical element is a parallel plate, flat glass or the like can be used, and the cost can be reduced.

  According to a third aspect of the present invention, in the camera module according to the first or second aspect, the optical surface of the imaging lens forming the infrared cut coat has a convex surface facing the image side.

  By forming the infrared cut coat on the optical surface with the convex surface facing the image side, the incident angle of the light beam toward the center of the imaging surface of the image sensor and the light beam toward the periphery of the image pickup surface is made closer, Angle dependence can be relaxed.

  According to a fourth aspect of the present invention, in the camera module according to the first or second aspect, the optical surface of the imaging lens forming the infrared cut coat has a concave surface directed toward the object side.

  By forming the infrared cut coat on the optical surface with the concave surface facing the object side, the incident angle of the light beam toward the center of the imaging surface of the image sensor and the light beam toward the periphery of the image pickup surface is made closer, Angle dependence can be relaxed.

  According to a fifth aspect of the present invention, there is provided the camera module according to any one of the first to fourth aspects, wherein the optical surface on which the infrared cut coat is formed has an arbitrary image height passing through an effective diameter excluding the optical axis. The angle between the normal of the optical surface at the incident position of the principal ray and the principal ray is 25 degrees or less.

  Of the chief rays incident on a conventional flat-plate infrared cut filter, the incident angle at the maximum image height on the imaging surface is around 30 degrees, and this angle may increase as the camera module becomes lower in the future. is there. If the angle between the principal ray of any image height and the normal of the optical surface at the incident position is 25 degrees or less on the optical surface on which the infrared cut coat is formed, the angle dependency of the infrared cut coat is large. There is no problem, and color shading can be improved. This is because the angle dependency of the infrared cut coat changes relatively greatly when the incident angle exceeds 25 degrees, and is desirably 25 degrees or less. In addition, if it is 20 degrees or less, it is more desirable.

  A camera module according to a sixth aspect is characterized in that, in the invention according to any one of the first to fifth aspects, the antireflection coat is formed on both surfaces of the optical member.

  Thereby, the reflection by an optical member can be suppressed more and, thereby, a ghost can be suppressed.

  A portable terminal according to claim 7 is a camera module according to any one of claims 1 to 6, a display unit for displaying a subject image obtained by the camera module, and / or a subject obtained by the camera module. And a wireless communication unit that transmits an image.

  According to the present invention, it is possible to provide a camera module that can solve the problem of color shading and the problem of ghost, and a portable terminal using such a camera module, while being small.

It is a figure which shows the state through which the light ray which goes to the center of the image pick-up surface 11a of the image pick-up element 11, and the light ray which goes to the periphery of the image pick-up surface 11a pass in the parallel plate in which the infrared cut coat was formed. It is a graph which shows the angle dependence characteristic of a general infrared cut filter. It is a graph which shows the angle dependence characteristic of a hybrid type infrared cut filter. It is a figure which shows an example of the cause of a ghost. It is a figure which shows an example of the cause of a ghost. It is sectional drawing along the optical axis of the camera module 10 concerning this Embodiment. It is the front view (a) of the smart phone which mounts a camera module, and the back view (b) of the smart phone which applied the camera module. It is a control block diagram of the smart phone of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 6 is a cross-sectional view of the camera module 10 according to the present embodiment. In addition, the structure shown below is schematic and there exists a thing from which an actual shape, a dimension, etc. differ.

  As shown in FIG. 6, the camera module 10 forms a subject image on a CMOS image sensor 11 as a solid-state image sensor having a photoelectric conversion unit (imaging surface) 11 a and the photoelectric conversion unit 11 a of the image sensor 11. An imaging lens 12, a lens barrel 13 that holds the imaging lens 12, a parallel plate-like optical element 14 disposed between the imaging lens 12 and the imaging element 11, an actuator 15 that drives the imaging lens 12, and an imaging element 11, and a base member 17 that holds the imaging lens 12 and the actuator 15.

  As shown in FIG. 6, the imaging element 11 has a photoelectric conversion unit 11 a as an imaging surface in which a plurality of light receiving pixels (photoelectric conversion elements) are two-dimensionally arranged on a wafer chip 11 b. A signal processing circuit (not shown) is formed around the periphery. Such a signal processing circuit includes a driving circuit unit that sequentially drives each pixel to obtain an output signal, an A / D conversion unit that converts each output signal into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like.

  A plurality of pads (not shown) formed near the outer edge of the wafer chip 11b of the image sensor 11 on the light receiving surface side are connected to the circuit board 16 by wires 11c.

  The pedestal member 17 integrally formed of resin has a generally rectangular parallelepiped housing shape, and includes four side wall portions 17a provided so as to surround the image pickup device 11 and an upper wall portion 17b intersecting with the upper end thereof. Have. A rectangular opening 17c is formed at the center of the upper wall portion 17b, and the optical filter 14 is attached to the upper wall portion 17b so as to cover the opening 17c.

  The image sensor 11 converts an output signal from the photoelectric conversion unit 11a into an image signal such as a digital YUV signal, and an external circuit (for example, a camera module) (not shown) is connected from the wire 11c through the wiring pattern of the circuit board 16. To the control circuit of the higher-level device mounted). Further, it is also possible to receive power and a clock signal for driving the image pickup device 11 from an external circuit through the wire 11c from the wiring pattern of the circuit board 16. Here, Y is a luminance signal, U (= R−Y) is a color difference signal between red and the luminance signal, and V (= BY) is a color difference signal between blue and the luminance signal. Note that the image sensor is not limited to the above CMOS image sensor, and other devices such as a CCD may be used.

  In FIG. 6, an imaging lens 12 is provided inside the lens barrel 13. The imaging lens 12 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 that are arranged in order from the object side, and each has a light shielding plate that shields a light beam outside the effective diameter. It is assembled with the flange part attached. In this example, the aperture stop corresponds to the object side aperture of the first lens L1 formed in the lens barrel 13.

  The optical surface on which the infrared cut coat IRC is formed is determined based on the following conditions. When the principal ray LB having the maximum image height on the imaging surface that passes through the imaging lens 12 is incident on the optical element 14, the angle formed between the normal line NL1 of the incident surface 14a of the optical element 14 and the principal ray at the incident position is determined. θ1 and the optical surface normal NL2 at the incident position of the principal ray at each angle of view for each of the optical surfaces L1a, L1b, L2a, L2b, L3a, L3b, L4a, and L4b of the imaging lens and the principal An infrared cut coat IRC is formed on an optical surface satisfying θ1> θ2 among the optical surfaces of the imaging lens 12 where θ2 is the maximum value of angles formed with light rays. θ2 is preferably 25 degrees or less, and more preferably 20 degrees or less. Specifically, in this example, the image side surface L3a with the convex surface facing the image side of the third lens L3 is the most preferable target, but the object side surface L3b with the concave surface facing the object side or the first lens L1 An infrared cut coat IRC may be formed on the image side surface L1a with the convex surface facing the image side.

    Moreover, you may determine the optical surface which forms the infrared cut coat IRC based on the following conditions. When a principal ray LB having an arbitrary image height on the imaging surface that passes through the effective diameter excluding the optical axis O of the imaging lens 12 is incident on the optical element 14, the incident surface 14a of the optical element 14 at the incident position thereof. When the chief ray LB having the same image height on the imaging surface is incident on the optical surface of the imaging lens 12, the normal NL2 of the optical surface at the incident position is defined as θ1. An infrared cut coat IRC is formed on the optical surface of the imaging lens 12 where θ1> θ2 is satisfied, where θ2 is an angle formed by the principal ray LB. θ2 is preferably 25 degrees or less, and more preferably 20 degrees or less. Specifically, in this example, the image side surface L3a with the convex surface facing the image side of the third lens L3 is the most preferable target, but the object side surface L3b with the concave surface facing the object side or the first lens L1 An infrared cut coat IRC may be formed on the image side surface L1a with the convex surface facing the image side.

    In addition, it is more preferable that the lens forming the infrared cut coat IRC is made of glass in consideration of heat resistance in the manufacturing process.

  Furthermore, an antireflection coat is formed on the optical element 14 disposed between the imaging lens 12 and the imaging element 11. Thereby, since reflection by the optical element 14 is suppressed, the ghost shown in FIGS. 4 and 5 can be effectively suppressed. In addition, it is preferable that the antireflection coating is applied on both sides.

  The actuator 15 includes a cylindrical carrier 15a screwed into the lens barrel 13, a coil 15b attached to the carrier 15a and extending in the direction of the optical axis, a magnet 15c arranged to oppose the coil 15b, and a magnet 15c. It consists of a supported housing-like yoke 15d. The coil 15b is connected to an external circuit via a wiring (not shown). The lower end of the yoke 15d is bonded onto the upper wall portion 17b of the base member 17. The carrier 15a is urged toward the image pickup device 11 by an elastic member (not shown).

  According to the present embodiment, unnecessary frequency light such as infrared light included in the subject light is cut by forming the infrared cut coat IRC on the image side surface 13a of the third lens L3 of the imaging lens 12. Yes. Since the image side surface 13a of the third lens L3 has a convex surface directed to the image side, it is incident on the center of the image pickup surface 11a of the image pickup device 11 and a light ray directed toward the vicinity thereof and a light ray directed toward the periphery of the image pickup surface 11a. The value of the angle difference and the incident angle itself can be reduced, so that the angle dependency of the infrared cut coat can be overcome and color shading can be effectively suppressed. Further, since the optical surface on which the infrared cut coat IRC is formed is disposed at a position farther from the image sensor than in the past, the influence of the reflected light generated on the optical surface on which the infrared cut coat IRC is formed on the image sensor. Can be reduced. Furthermore, since the anti-reflection coating is formed on the optical element 14 disposed between the imaging lens 12 and the imaging element 11, reflection on the optical element 14 is suppressed, and thus, while being small, A camera module can be obtained in which the problem of color shading and the problem of ghost are solved.

  Furthermore, in this embodiment, since the optical element 14 with the antireflection coating ARC is disposed between the imaging lens 12 and the imaging element 11, reflection at the optical element 14 is suppressed, so that ghosting is effective. To be suppressed. In addition, by covering the image sensor 11 with the optical element 14, it is possible to suppress dust and the like from adhering to the image pickup surface.

    In this example, the imaging lens having four lenses is described, but the present invention is not limited to this.

  The operation of the camera module 10 described above will be described. FIG. 7 shows a state in which the camera module 10 is mounted on a smartphone 100 that is an example of a mobile terminal. FIG. 8 is a control block diagram of the smartphone 100.

  In the camera module 10, for example, the object-side end surface of the lens barrel 13 is provided on the back surface of the smartphone 100 (see FIG. 7B), and a liquid crystal display unit is disposed on the surface side of the smartphone 100.

  The camera module 10 is connected to the control unit 101 of the smartphone 100 via an external connection terminal (arrow in FIG. 7), and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.

  On the other hand, as shown in FIG. 8, the smartphone 100 controls each unit in an integrated manner, and a control unit (CPU) 101 that executes a program corresponding to each process, a switch such as a power source, a number, and the like using a touch pad. An input unit 60 for inputting instructions, and a display unit 65 for displaying captured images and the like in addition to predetermined data on a liquid crystal panel (however, the touch panel 70 serves as both the liquid crystal panel of the display unit and the touch pad of the input unit) And a wireless communication unit 80 for realizing various information communications with an external server, and a storage unit (ROM) storing necessary data such as a system program, various processing programs, and a terminal ID of the smartphone 100 91, various processing programs and data executed by the control unit 101, processing data, or camera module 10. And a temporary storage unit used as a work area for temporarily storing the imaging data and the like and a (RAM) 92.

  The camera module 10 is operated by the operation of the input unit 60 of the smartphone 100. The camera module 10 is operated by driving the imaging lens 12 by the actuator 15 to perform an autofocus operation and pressing the release button 71 or the like. Imaging. The image signal input from the camera module 10 is stored in the storage unit 91 or the temporary storage unit 92 by the control system of the smartphone 100 or displayed on the display unit 65, and further via the wireless communication unit 80. It is transmitted to the outside as video information.

  The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are apparent to those skilled in the art from the embodiments and ideas described in the present specification. It is.

DESCRIPTION OF SYMBOLS 10 Camera module 11 Image pick-up element 11a Photoelectric conversion part 11b Wafer chip 11c Wire 12 Imaging lens 13 Lens tube 14 Optical element 15 Actuator 15a Carrier 15b Coil 15c Magnet 15d Yoke 16 Circuit board 17 Base member 17a Side wall part 17b Upper wall part 17c Opening 60 Input key unit 65 Display unit 70 Touch panel 71 Release button 80 Wireless communication unit 92 Storage unit 100 Smartphone 101 Control units L1 to L4 Imaging lens IRC Infrared cut coat ARC Antireflection coat

Claims (8)

A plurality of imaging lenses for forming a subject image;
An image sensor that photoelectrically converts a subject image formed by the imaging lens;
In a camera module having an optical element disposed between the imaging lens and the imaging element,
When a principal ray having the maximum image height on the imaging surface passing through the imaging lens is incident on the optical element, an angle formed by the normal of the incident surface of the optical element and the principal ray at the incident position is θ1 ,
For each optical surface of the imaging lens, when the principal ray of each angle of view has a maximum value of the angle between the normal of the optical surface at the incident position and the principal ray, respectively θ2,
An infrared cut coat is formed on any one of the optical surfaces of the imaging lens that satisfies θ1> θ2, and an antireflection coat is formed on the optical element. A plurality of imaging lenses for forming a subject image;
An image sensor that photoelectrically converts a subject image formed by the imaging lens;
In a camera module having an optical element disposed between the imaging lens and the imaging element,
When a principal ray having an arbitrary image height on the imaging surface that passes through the effective diameter excluding the optical axis of the imaging lens is incident on the optical element, the normal of the incident surface of the optical element at the incident position And the angle between the principal ray and θ1
When the chief ray of the same image height on the imaging surface is incident on the optical surface of the imaging lens, when the angle between the normal of the optical surface at the incident position and the chief ray is θ2,
An infrared cut coat is formed on any one of the optical surfaces of the imaging lens that satisfies θ1> θ2, and an antireflection coat is formed on the optical element.   The camera module according to claim 1, wherein the optical element is a parallel plate.   4. The camera module according to claim 1, wherein an optical surface of the imaging lens forming the infrared cut coat has a convex surface directed to the image side. 5.   4. The camera module according to claim 1, wherein an optical surface of the imaging lens forming the infrared cut coat has a concave surface directed toward the object side. 5.   In the optical surface forming the infrared cut coat, the angle formed between the normal of the optical surface at the incident position of the principal ray of any image height passing through the effective diameter and the principal ray is 25 degrees or less. The camera module according to any one of claims 1 to 5.   The camera module according to claim 1, wherein the antireflection coat is formed on both surfaces of the optical member.   A camera module according to any one of claims 1 to 7, a display unit that displays a subject image obtained by the camera module, and / or a wireless communication unit that transmits a subject image obtained by the camera module. A portable terminal comprising:

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