WO2007043508A1

WO2007043508A1 - Imaging device

Info

Publication number: WO2007043508A1
Application number: PCT/JP2006/320171
Authority: WO
Inventors: Masaaki Tsuchida
Original assignee: Konica Minolta Opto, Inc.
Priority date: 2005-10-14
Filing date: 2006-10-10
Publication date: 2007-04-19
Also published as: JPWO2007043508A1

Abstract

Provided is an imaging device mounted with an actuator which has excellent versatility and has sufficient drive power even for driving a plurality of lenses. The diameters of lenses other than a fourth lens (L4) arranged closest to an image plane are smaller than the diameter of the fourth lens. An actuator (30) is arranged and the number of windings of a coil (33) is increased by using such diameter difference, and drive power of the actuator (30) required for driving the four lenses (L1-L4) is ensured. The imaging device can be mounted on a socket (40) having smaller dimensions, conforming to the standards such as SMIA95, and the highly versatile imaging device is provided.

Description

Specification

Imaging device

Technical field

The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus suitable for use in an imaging apparatus using a solid-state imaging element such as a CCD image sensor or a CMOS image sensor.

Background art

In recent years, CCD (Charge Coupled Device) type or CMOS (Complementary

With the improvement in performance of imaging devices using a metal oxide semiconductor (solid state) imaging device, mobile phones equipped with an imaging device equipped with an autofocus mechanism (hereinafter referred to as AF mechanism) are becoming popular. . Here, when an imaging device is mounted on a mobile phone or the like, there is a camera module standard (for example, SMIA95) on the premise that a socket is attached. Therefore, if an imaging device is designed according to this standard, the socket insertion is compatible. Therefore, an imaging device with high versatility can be obtained (see Patent Document 1).

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-153855

Disclosure of the invention

Problems to be solved by the invention

By the way, in an imaging apparatus having a plurality of lenses, when focusing is performed by moving one lens in the optical axis direction, if the optical axis tilts or shifts due to the movement of the lens, the optical performance May deteriorate. Such a problem is likely to occur when the lens is moved using a voice coil motor as an actuator. On the other hand, there is an attempt to move all of the plurality of lenses in the optical axis direction during focusing, and according to this, tilting or shifting of the optical axis between the lenses is suppressed, so that high optical performance can be obtained. In order to move all the lenses, it is necessary to increase the driving force of the actuator.

For example, in the case of a voice coil motor, the driving force can be increased by increasing the number of coil windings, increasing the coil length, increasing the current, and increasing the magnetic flux density. While doing In general, the magnetic flux density is determined depending on the performance of the magnet, so it is difficult to achieve a high density. In addition, when the current is increased, the amount of heat generation increases, and when the driving target is a plastic lens, there is a risk of deteriorating optical performance. On the other hand, an increase in the number of coil wires and an increase in coil length leads to a large force actuator that can be relatively easily made, and may not be mounted on a standard socket.

[0005] The present invention has been made in view of the problems of the prior art, and is equipped with an actuator that has excellent versatility and can exhibit sufficient driving force even when driving a plurality of lenses. An object of the present invention is to provide an imaging apparatus.

Means for solving the problem

[0006] The imaging device according to claim 1 is:

A housing attached to the socket; an imaging lens including at least one movable lens movable in the optical axis direction relative to the housing; and an actuator for driving the movable lens in the optical axis direction. Among the photographing lenses, the diameter of the final lens arranged closest to the image plane is configured to be the largest, and the actuator is arranged using the difference in diameter between the final lens and a lens other than the final lens. It is characterized by that.

[0007] Even in an imaging device mounted on a mobile phone or the like, it is advantageous that the size of the imaging device is as large as possible in terms of the number of pixels, dynamic range, and the like. Tends to grow. In view of this, the present inventor has adopted a photographing lens in which the diameter of the final lens immediately before the image sensor is increased corresponding to the image sensor, and the front lens group is configured with a small diameter lens while ensuring telecentric characteristics. By utilizing the difference in diameter between the final lens and the front lens, an actuator was placed to create an overall small-size imaging device.

[0008] The imaging device according to claim 2 is,

A housing attached to the socket; an imaging lens including at least one movable lens movable in the optical axis direction relative to the housing; and an actuator for driving the movable lens in the optical axis direction. And when the said actuator is seen in the attachment direction of the said socket, a part of the said actuator has protruded outward from the said socket, It is characterized by the above-mentioned. [0009] The present inventor has paid attention to the fact that at least the socket mounting portion of the housing can be mounted on a standard socket as long as it has a size conforming to the standard. More specifically, when the above-mentioned actuator is viewed in the mounting direction of the socket, a part of the actuator is designed to protrude outward from the socket, so that the actuator with high driving force can be obtained. In this way, we have created an imaging device that can be mounted in a smaller socket.

[0010] The imaging device according to claim 3,

A housing attached to the socket; an imaging lens including at least one movable lens movable in the optical axis direction relative to the housing; and an actuator for driving the movable lens in the optical axis direction. Among the photographic lenses, the diameter of the final lens arranged closest to the image plane is configured to be the largest. When the actuator is viewed in the mounting direction of the socket, a part of the actuator is more than the socket. It is characterized by protruding outward.

[0011] The inventor makes the photographic lens in which the front lens group is configured by a small-diameter lens while ensuring the telecentric characteristics by making the final lens diameter the largest, and the diameter of the final lens and the front lens is Using the difference, the actuator is arranged so that a part of the actuator protrudes outward from the socket when viewed in the socket mounting direction. An imaging device that can be mounted in a socket with a smaller size was created.

[0012] The imaging device according to claim 4 is the invention according to any one of claims 1 to 3, wherein the final lens has a refractive power in which the center is negative and the periphery is positive. It has a surface shape having

[0013] The imaging device according to Claim 5 is the imaging device according to any one of Claims 1 to 4, wherein the photographing lens has a four-lens configuration and is arranged closest to the object side. The first lens is a lens having a positive refractive power.

[0014] The imaging device according to Claim 6 is the imaging device according to any one of Claims 1 to 5, wherein the photographic lens has positive, negative, positive in order of object side force. It is composed of a lens having a negative refractive power. [0015] The imaging device according to claim 7 is the imaging device according to any one of claims 1 to 6, wherein the actuator is cylindrical and the socket is attached in a rectangular shape. It has a surface.

[0016] The imaging device according to Claim 8 is characterized in that in the invention according to any one of Claims 1 to 7, the actuator is a voice coil motor. The

[0017] The imaging device according to claim 9 is the invention according to any one of claims 1 to 7, wherein the actuator uses a piezoelectric element. It is characterized by.

The invention's effect

[0018] According to the present invention, it is possible to provide an imaging apparatus equipped with an actuator that has excellent versatility and can exhibit a sufficient driving force even when driving a plurality of lenses.

Brief Description of Drawings

FIG. 1 is a perspective view of an imaging apparatus 50 according to a first embodiment.

2 is a view of the imaging device 50 of FIG. 1 cut along a plane including the line II and viewed in the direction of the arrow.

FIG. 3 is a perspective view of an imaging apparatus 50 according to a second embodiment.

4 is a view of the imaging device 50 in FIG. 3 cut along a plane including the line II and viewed in the direction of the arrow.

FIG. 5 is a diagram showing a state in which the imaging device 50 is installed in a mobile phone 100 as a mobile terminal.

FIG. 6 is a control block diagram of mobile phone 100.

Explanation of symbols

[0020] 10 Imaging lens

20 Assembly case

21 outer cylinder

21 A Box section

21B Upper tube

21a Flange

21b recess Moving cylinder a Large cylindrical part b Small cylindrical part c Flange 咅 d Holding member Spring member Spring member Actuator Yoke Magnet

Coil

Socket bottom

a Metal terminal side

a Engagement part

Imaging device Image sensor a Photoelectric converter Board

a External connection terminal Input unit Display unit Wireless communication unit Storage unit

0 Mobile phone 1 Control unit Adhesive BT button

F cut filter

Hl +, H2 +, HI—, H2— wiring

L1 ~ L4 lens

S Aperture stop

W wire

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an image pickup apparatus 50 including an image pickup apparatus according to the present embodiment, and shows a socket to be attached. FIG. 2 includes the image pickup apparatus 50 of FIG. It is the figure which cut | disconnected by the surface and looked at the arrow direction.

As shown in FIG. 1, the socket 40 has a box shape including a rectangular bottom surface (also referred to as a mounting surface) 41 and a side surface 42 formed around the bottom surface 41. The bottom surface 41 will be described later. It has a plurality of metal terminals 41a that are electrically connected to the cellular phone and extend obliquely upward. In addition, a plurality of engaging portions 42a having a spring plate force bent in a “<” shape are formed on the inner wall of each side surface 42.

[0023] An imaging device 50 according to the first embodiment shown in Figs. 1 and 2 includes a CMOS image sensor 51 as a solid-state imaging device having a photoelectric conversion unit 51a, and a photoelectric conversion unit of the image sensor 51. The image pickup lens 10 as an image pickup lens for picking up a subject image by 51a, the IR cut filter F arranged between the image sensor 51 and the image pickup lens 10, the image sensor 51 on the upper surface, and the image sensor 51 on the lower surface. A substrate 52 having an external connection terminal 52a for transmitting and receiving electrical signals, an assembly housing 20 for supporting an imaging lens, and an actuator (also called a focus actuator) 30 for driving a focusing lens, These are formed in one piece. The height Δ in the optical axis direction of the imaging device 50 is 10 mm or less.

[0024] The image sensor 51 has a photoelectric conversion unit 51a as a light receiving unit, which is arranged in a pixel (photoelectric conversion element) force dimensionally in the center of the plane on the light receiving side. A signal processing circuit (not shown) is formed in the enclosure. Powerful signal processing circuit A driving circuit unit that sequentially drives the signal charges to obtain signal charges, an AZD conversion unit that converts each signal charge into a digital signal, and a signal processing unit that forms an image signal output using the digital signal are also configured. In addition, a large number of knots (not shown) are arranged near the outer edge of the plane on the light receiving side of the image sensor 51, and are connected to the substrate 52 via wires W. The image sensor 51 converts the signal charge from the photoelectric conversion unit 51a into an image signal such as a digital YUV signal and outputs the image signal to a predetermined circuit on the substrate 52 via the wire W. Here, Y is a luminance signal, U (= RY) 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-described CMOS image sensor, and other devices such as a CCD may be used.

[0025] The substrate 52 has a large number of signal transmission pads provided on the front surface, which are connected to the wires W from the image sensor 51 described above and arranged in a plurality of rows on the back surface. Is connected to the terminal 52a. When the imaging device 50 is mounted in the socket 40, the external connection terminals 52a are in contact with the metal terminals 41a, respectively.

[0026] The substrate 52 is connected to an external circuit (for example, a control circuit included in a host device on which the imaging device is mounted) via the external connection terminal 52a, and a voltage for driving the image sensor 51 from the external circuit It is possible to receive a clock signal and output a digital YUV signal to an external circuit.

[0027] The assembly housing 20 that also serves as a light-shielding member is disposed so as to surround the image sensor 51, and has a rectangular box portion 21A that has a lower end bonded to the base plate 52 using an adhesive B. An outer cylinder 21 including an upper cylinder 21B attached to an upper portion of the box portion 21A. As shown in FIG. 1, a concave portion 21b corresponding to the engaging portion 41a of the socket 40 is formed on the opposite side surface of the box portion 21A.

In FIG. 2, an IR cut filter F is attached to a flange portion 21a in which the inner peripheral force of the box portion 21A extends in the direction perpendicular to the optical axis.

[0029] The movable cylinder 22 disposed so as to be movable with respect to the assembly housing 20 includes a large cylindrical portion 22a, a small cylindrical portion 22b connected to the upper end thereof, and a flange portion 22c formed on the upper end thereof. Holding member 22d attached so as to close the large cylindrical portion 22a, and these are fixedly fixed in the order of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 from the object side. Comprehension I have it. The center opening of the flange 22c is the aperture stop S. The holding member 22d is attached to the lower surface of the flange portion of the fourth lens L4.

[0030] A cylindrical actuator 30 is disposed outside the small cylindrical portion 22b of the movable cylinder 22 in the direction perpendicular to the optical axis. The actuator 30 includes a coil 33 attached to the upper end of the large cylindrical portion 22a, a magnet 32 attached to the upper end of the upper cylinder 21B, and a yoke 31 attached to the upper cylinder 21B and covering the periphery of the magnet 32 and the coil 33. It is made up of.

[0031] The spring member 27 having a shape in which donut discs having different diameters are connected to each other while shifting the phase of the connection position is fixed to the vicinity of the lower end of the upper tube portion 21B, and the inner periphery side of the spring member 27 is a holding member. It is fixed to the lower surface of 22d. On the other hand, the spring member 28 having a shape similar to that of the spring member 27 has its outer peripheral side fixed to the upper surface of the yoke 31 and its inner peripheral side fixed to the upper end of the movable cylinder 22. The spring members 27 and 28 generate an urging force in response to the movement cylinder 22 moving in the optical axis direction.

[0032] The plus terminal of the coil 33 of the actuator 30 is connected to the spring member 27 via a wiring HI + extending through the outer wall of the large cylindrical portion 22a of the movable cylinder 22. Further, the spring member 27 is connected to the substrate 52 through H2 + that penetrates the outer wall of the upper tube 21B and further extends the outer wall of the box portion 21A. Further, the negative terminal of the coil 33 is connected to the spring member 28 via the wiring H 1-extending through the outer wall of the small cylindrical portion 22b of the movable cylinder 22. The spring member 28 is connected to the substrate 52 via the yoke 31, the upper cylinder 21B, and the H2— extending on the outer wall of the box portion 21A. The driving principle of the voice coil motor is well known, so the force to be omitted is generated by supplying power to the coil 33 from the outside through the spring members 27, 28, wiring H1 +, H2 +, H1—, H2— The coil 33 can be displaced with respect to the magnet 32 according to the supplied electric power by the magnetic force applied.

The imaging lens 10 includes, in order from the object side, an aperture stop S, a first lens Ll having a positive refractive power and a convex surface facing the object side, a second lens L2 having a negative refractive power, and a positive refraction. A third lens L3 having power and a fourth lens L4 having negative refractive power. Each of the lenses Ll, L2, L3, and L4 is positioned by fitting the flange portions with each other, and is held by the moving cylinder 22 in a state where the optical axes thereof are coincident with each other. Here, the total length of the optical system can be shortened by employing a positive lens for the first lens L1. In addition, the optics of an imaging device using an imaging device As a system, securing telecentric characteristics is important. In the present embodiment, in order to make the incident angle to the imaging element substantially parallel to the optical axis, the effective diameter of the fourth lens L4 is configured to be substantially the same as the diagonal length of the imaging element. The fourth lens L4 has an excellent telecentric characteristic as an imaging device using an imaging device by making the center negative and making the periphery have positive refractive power. Furthermore, by setting the fourth lens L4 as described above, the effective diameters of the first lens L1 to the third lens L3 in front of the fourth lens L4 can be reduced. In addition, lens performance can be improved by using a four-lens optical system, and a clear image of the subject can be obtained by moving in the optical axis direction. In this embodiment, the lenses Ll, L2, L3, and L4 have a smaller outer diameter than the force lenses L3 and L4 that constitute the focusing lens (also referred to as a movable lens). By utilizing the difference in diameter, a coil 33 having a larger number of windings and a larger thickness can be incorporated into the movable cylinder 22.

The imaging lens 10 is for performing imaging of a subject image on a solid imaging element using the aperture stop S and the lenses Ll, L2, L3, and L4 as an optical system. The aperture stop S is a member that determines the F number of the entire imaging lens system.

The IR cut filter F held by the flange portion 21a of the outer cylinder 21 between the imaging lens 10 and the image sensor 51 is a member formed in, for example, a substantially rectangular shape or a circular shape.

[0036] Further, a light shielding mask may be disposed between the third lens L3 and the fourth lens L4, so that unnecessary light is incident outside the effective diameter of the fourth lens L4 close to the solid-state imaging device. This can prevent ghosts and flares.

A mode in which the imaging device 50 is attached to the socket 40 will be described. In FIG. 1, the box portion 21 A of the imaging device 50 is directed toward the socket 40, and the substrate 52 is pressed toward the bottom plate 41. Then, the external connection terminals 52a (FIG. 2) formed on the back surface of the substrate 52 come into contact with the metal terminals 41a, and signals can be exchanged. Further, the engaging portion 42a of the side surface 42 elastically deforms to allow the passage of the box portion 21A, and when the concave portion 21b comes to the opposite position, it returns to the concave portion 21b by returning from the elastic deformation. Engaging, thereby preventing the imaging device 50 from coming out of the socket 40.

[0038] That is, the imaging apparatus according to the first embodiment has the largest diameter of the fourth lens L4, which is the final lens disposed closest to the image plane, among the photographing lenses, and the fourth lens L4. And beyond The actuator 30 is arranged using the difference in diameter with the outside lens. This makes it possible to create a small-sized imaging device as a whole, ensuring the driving force of the actuator 30 required to drive the four lenses L1 to L4, and sockets that conform to standards such as SMIA95. Therefore, it is possible to obtain a highly versatile imaging device.

Hereinafter, the second embodiment will be described with reference to the drawings. FIG. 3 is a perspective view of the imaging device 50 including the imaging device according to the second embodiment, and shows the socket with a socket to be attached. FIG. 4 shows the imaging device 50 of FIG. It is the figure which cut | disconnected in the surface containing and was seen in the arrow direction.

[0040] In order to avoid duplication of explanation, the same reference numerals are given to the same functional members, and the parts different from those in Figs. 1 and 2 will be described.

[0041] The socket 40 shown in FIG. 3 is the same as the socket shown in FIG. 1, and a description thereof will be omitted.

The imaging device 50 according to the second embodiment shown in FIGS. 3 and 4 is similar to the description in the imaging device according to the first embodiment, and has a photoelectric conversion unit 51a. A CMOS image sensor 51 as an element, an imaging lens 10 as an imaging lens that causes the photoelectric conversion unit 51 a of the image sensor 51 to capture an object image, and the image sensor 51 and the imaging lens 10. An IR cut filter F arranged, a substrate 52 having an external connection terminal 52a for holding the image sensor 51 on the upper surface and transmitting and receiving the electric signal on the lower surface, and an assembly case 20 for supporting the imaging lens And an actuator 30 (also referred to as a focus actuator) for driving the focusing lens, which are integrally formed. Note that the height Δ in the optical axis direction of the imaging device 50 is 10 mm or less.

A cylindrical actuator 30 is disposed outside the small cylindrical portion 22b of the moving cylinder 22 in the direction perpendicular to the optical axis. The actuator 30 includes a coil 33 attached to the upper end of the large cylindrical portion 22a, a magnet 32 attached to the upper end of the upper cylinder 21B, and a yoke 31 attached to the upper cylinder 21B and covering the periphery of the magnet 32 and the coil 33. It is made up of.

The imaging device 50 according to the second embodiment is apparent from FIGS. 3 and 4, but the maximum outer diameter D of the yoke 31 is the length of one side of the substrate 52 and the box portion 21A. It is larger than L. Even if the magnet 32 is attached to the moving cylinder 22 and the coil 33 is attached to the upper cylinder 21B. good.

[0045] The plus terminal of the coil 33 of the actuator 30 is connected to the spring member 27 via a wiring HI + extending on the outer wall of the large cylindrical portion 22a of the movable cylinder 22. Further, the spring member 27 is connected to the substrate 52 through H2 + that penetrates the outer wall of the upper tube 21B and further extends the outer wall of the box portion 21A. Further, the negative terminal of the coil 33 is connected to the spring member 28 via the wiring H 1-extending through the outer wall of the small cylindrical portion 22b of the movable cylinder 22. The spring member 28 is connected to the substrate 52 via the yoke 31, the upper cylinder 21B, and the H2— extending on the outer wall of the box portion 21A. The driving principle of the voice coil motor is well known, so the force to be omitted is generated by supplying power to the coil 33 from the outside through the spring members 27, 28, wiring H1 +, H2 +, H1—, H2— The coil 33 can be displaced with respect to the magnet 32 according to the supplied electric power by the magnetic force applied.

The imaging lens 10 includes, in order from the object side, an aperture stop S, a first lens Ll having a positive refractive power and a convex surface facing the object side, a second lens L2 having a negative refractive power, and a positive refraction. A third lens L3 having power and a fourth lens L4 having negative refractive power. Each of the lenses Ll, L2, L3, and L4 is positioned by fitting the flange portions with each other, and is held by the moving cylinder 22 in a state where the optical axes thereof are coincident with each other. Here, the total length of the optical system can be shortened by employing a positive lens for the first lens L1. In addition, it is important to ensure telecentric characteristics as an optical system of an imaging device using an imaging device. In the present embodiment, in order to make the incident angle to the imaging element substantially parallel to the optical axis, the effective diameter of the fourth lens L4 is configured to be substantially the same as the diagonal length of the imaging element. The fourth lens L4 has an excellent telecentric characteristic as an imaging device using an imaging device by making the center negative and making the periphery have positive refractive power. Furthermore, by setting the fourth lens L4 as described above, the effective diameters of the first lens L1 to the third lens L3 in front of the fourth lens L4 can be reduced. In addition, lens performance can be improved by using a four-lens optical system, and a clear image of the subject can be obtained by moving in the optical axis direction. In this embodiment, the lenses Ll, L2, L3, and L4 have a smaller outer diameter than the force lenses L3 and L4 that constitute the focusing lens (also referred to as a movable lens). In addition to using the diameter difference, when the actuator 30 is viewed in the mounting direction of the socket 40, By configuring the portion to protrude outward from the socket 40, the coil 33 having a larger number of windings and a greater thickness can be incorporated into the movable cylinder 22.

A mode in which the imaging device 50 is mounted on the socket 40 will be described. In FIG. 3, the box portion 21 A of the imaging device 50 is directed toward the socket 40, and the substrate 52 is pressed toward the bottom plate 41. Then, the external connection terminal 52a (FIG. 4) formed on the back surface of the substrate 52 comes into contact with the metal terminal 41a, and signals can be exchanged. Further, the engaging portion 42a of the side surface 42 elastically deforms to allow the passage of the box portion 21A, and when the concave portion 21b comes to the opposite position, it returns to the concave portion 21b by returning from the elastic deformation. Engaging, thereby preventing the imaging device 50 from coming out of the socket 40.

That is, according to the imaging apparatus of the second embodiment, the maximum outer diameter D of the yoke 31 is larger than the length L of one side of the substrate 52 and the box portion 21A, that is, the actuator 30 is When viewed in the mounting direction (here, the optical axis direction), the box portion 21A protrudes. Therefore, it is possible to secure the high driving force of the actuator 30 necessary to drive the four lenses L1 to L4 by increasing the number of windings of the coil 33, and to a smaller size according to the standard such as SMIA95. Therefore, the imaging device can be obtained with high versatility.

[0049] Further, the actuator 30 is arranged by utilizing the difference in diameter between the fourth lens L4 and the front lens while ensuring the telecentric characteristics by enlarging the diameter of the fourth lens L4 as the final lens. The actuator 30 is configured so that a part of the actuator 30 protrudes outward from the socket 40 when viewed in the mounting direction of the socket 40. It is possible to obtain a highly versatile imaging device that can be used.

[0050] Usage modes of the imaging device 50 according to the first and second embodiments described above will be described. FIG. 5 is a diagram showing a state in which the imaging device 50 is installed in a mobile phone 100 as a mobile terminal. FIG. 6 is a control block diagram of the mobile phone 100.

[0051] In the imaging device 50, for example, the object-side end surface of the outer cylinder 21 in the imaging lens is provided on the back surface of the mobile phone 100 (the liquid crystal display unit side is the front), and the position corresponding to the lower part of the liquid crystal display unit酉 I will be established by myself. [0052] The external connection terminal 52a of the imaging device 50 is connected to the control unit 101 of the mobile phone 100 via the socket 40, and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.

[0053] On the other hand, as shown in FIG. 6, the cellular phone 100 controls each part in an integrated manner, and also supports a control part (CPU) 101 that executes a program corresponding to each process, and supports numbers and the like with keys. An input unit 60 for displaying data, a display unit 70 for displaying captured images and videos in addition to predetermined data, a wireless communication unit 80 for realizing various types of information communication with an external server, A storage unit (ROM) 91 that stores necessary data such as system programs, various processing programs, and terminal IDs of the mobile phone 100, and various processing programs and data executed by the control unit 101, or processing data, Alternatively, the imaging device 50 includes a temporary storage unit (RAM) 92 that is used as a work area for temporarily storing imaging data and the like.

[0054] When the photographer holding the mobile phone 100 directs the optical axis of the imaging lens 10 of the imaging device 50 toward the subject, a force for capturing an image signal into the image sensor 51, for example, image plane AF processing is performed. Thus, it is possible to detect a focus shift. Since the control unit 101 supplies power to the actuator 30 so as to drive the lenses L1 to L4 in the direction to cancel the defocus, the wiring HI +, H2 +, HI— is supplied from the external connection terminal 52a. , Power is supplied to coil 33 via H2—. At this time, the magnetic flux density is increased by the yoke 31 disposed around the magnet 32, and the electric power can be efficiently converted into a magnetic force. By balancing the magnetic force generated by this and the biasing force of the deformed spring members 27 and 28, the lenses L1 to L4 can be moved and held together with the movable barrel 22 to the optimum focusing position. Appropriate autofocus operation can be realized. If the drive power of the actuator 30 disappears due to the interruption of the power supply, the movable cylinder 22 returns to the original position.

When the photographer presses the button BT shown in FIG. 5 at a desired shirt chance, the release is performed and the image signal is taken into the imaging device 50. The image signal input from the imaging device 50 is transmitted to the control system of the mobile phone 100 through the socket 40, stored in the storage unit 92, or displayed on the display unit 70. Further, the wireless communication unit 80 It will be sent to the outside as video information. [0056] While the present invention has been described with reference to the embodiment, it should be understood that the present invention should not be construed as being limited to the above-described embodiment, but can be modified or improved as appropriate. The For example, the movable lens should be one or more of lenses L1 to L4, and the total number of lenses is not limited to four.

Further, in the present embodiment, an example in which a voice coil motor is used as an actuator has been described. However, for example, a piezoelectric element as described in Japanese Patent No. 3141714, Japanese Patent No. 3266025, and the like is used. The lens group can be moved using an actuator with a shaft member attached, or a stepping motor can be used.

Claims

The scope of the claims

[1] a housing attached to the socket;

An imaging lens including at least one movable lens movable in the optical axis direction with respect to the housing;

An actuator for driving the movable lens in the direction of the optical axis,

Of the imaging lenses, the diameter of the final lens arranged closest to the image plane is configured to be the largest,

An imaging apparatus, wherein the actuator is arranged using a difference in diameter between the final lens and a lens other than the final lens.

[2] a housing attached to the socket;

An actuator for driving the movable lens in the direction of the optical axis,

An imaging apparatus according to claim 1, wherein when the actuator is viewed in the mounting direction of the socket, a part of the architect protrudes outward from the socket.

[3] a housing attached to the socket;

An actuator for driving the movable lens in the direction of the optical axis,

Of the imaging lenses, the diameter of the final lens arranged closest to the image plane is the largest,

[4] The imaging device according to any one of claims 1 to 3, wherein the final lens has a surface shape having a negative refractive power at the center and a positive refractive power at the periphery. .

[5] The photographic lens has a four-lens configuration, and the first lens arranged closest to the object side is a lens having a positive bending force. The imaging device according to any one of the above.

6. The photographing lens according to any one of claims 1 to 5, wherein the photographing lens is composed of lenses having positive, negative, positive, and negative refractive power in order from the object side. The imaging device described in 1.

[7] The imaging device according to any one of [1] to [6], wherein the actuator is cylindrical, and the socket has a rectangular mounting surface.

[8] The imaging apparatus according to any one of claims 1 to 7, wherein the actuator is a voice coil motor.

[9] The imaging device according to any one of claims 1 to 6, wherein the actuator uses a piezoelectric element.