JP4963387B2 - Portable device - Google Patents

Description

  The present invention relates to a mobile device such as a mobile phone having a function of correcting image shake.

  With the current camera, all the important tasks for shooting such as determining exposure and focusing are automated, and it is very unlikely that people who are unskilled in camera operation will fail to shoot. Recently, many products have also been equipped with a shake correction device that prevents image shake due to camera shake applied to the camera, and there has been almost no cause for a photographer to make a shooting mistake.

  Here, the shake correction apparatus will be briefly described. The camera shake at the time of shooting is usually a vibration of 1 Hz to 10 Hz as a frequency. In order to be able to take a picture without image shake even when the above-mentioned camera shake occurs at the time of shooting, the camera shake due to camera shake is detected, and the lens is set in a direction to cancel the shake according to the detected value. Displace. For this reason, firstly, it is necessary to accurately detect camera shake, and secondly, it is necessary to correct an optical axis change due to camera shake.

  In principle, camera shake is detected by detecting acceleration, angular acceleration, angular velocity, angular displacement, and the like, and mounting a means for appropriately calculating the output for camera shake correction in the camera. Then, based on this detection information, image blur suppression is performed by driving a correction lens that decenters the photographic optical axis.

  FIG. 12 is an external view of a digital compact camera having a shake correction device, and performs shake correction for the camera vertical shake 122p and the horizontal shake 122y with respect to the optical axis 120. FIG. In the camera body 121, 121a is a release button, 121b is a mode dial (including a main switch), and 121c is a retractable strobe.

  In FIG. 12, a liquid crystal monitor is provided on the back surface of the camera body 121, which is arranged on the back surface of the camera body 121, so that an image captured by an image sensor 54 described later can be confirmed. The photographer confirms the composition of the photographed image on the LCD monitor, and then performs photographing.

  FIG. 13 is an internal perspective view of FIG. In FIG. 13, reference numeral 54 denotes an image pickup device which is an image pickup means, and 131 denotes a correction mechanism which performs image blur correction in the directions of arrows 122p and 122y by driving the correction lens 130 freely in directions 132p and 132y in the figure. Reference numerals 21p and 21y denote vibration detection units such as an angular velocity meter and an angular accelerometer that detect vibrations around the arrows 21a and 21b, respectively. The outputs of the vibration detection units 21p and 21y are converted into shake correction drive target values via the calculation units 81p and 81y, input to the correction mechanism 131, and the correction mechanism 131 performs shake correction.

By the way, in recent digital cameras, the image sensor has become very small and has been mounted even on mobile phones. In the past, proposals have been made for mounting on mobile phones. In Patent Document 1, both the photographing optical system and the image pickup device that is an image pickup unit are integrally swung with respect to the substrate. In Patent Document 2, as an image shake correction device for a mobile phone, a vibration detection unit is attached to a side surface of the shake correction unit, and the shake correction unit is controlled so that the output of the vibration detection unit is always zero.
JP 2005-173372 A JP 2004-153503 A

  Since mobile phones are small and light, there is a problem that camera shake during shooting is large. Therefore, countermeasures against image blur due to camera shake are an important issue. However, in the conventional shake correction apparatus, the shake correction means is particularly large and complicated, so that it is difficult to mount it on a mobile phone. In the above-mentioned patent document 1, since both the photographing optical system and the image pickup device are integrally swung with respect to the substrate, the size is large, and the connection of the image pickup device to the substrate becomes a driving load. There is a problem.

  Moreover, the control method (zero method) like the above-mentioned patent document 2 has the merit that it is stable against the output linearity deficiency of the vibration detection unit and the temperature fluctuation. However, since the shake correction unit and the vibration detection unit need to be integrated, the apparatus becomes large. In order to reduce the size of the image shake correction apparatus, it is preferable to disperse the vibration detection unit and the shake correction unit and arrange them in an empty space of the portable device.

(Object of invention)
An object of the present invention is to provide a portable device that can achieve downsizing while having an image blur correction function.

In order to achieve the above object, the present invention provides an imaging means, a substrate holding the imaging means, a lens barrel having a photographing optical system in which a plurality of lenses are arranged in the optical axis direction, and the lens mirror. Three rolling members sandwiched between a tube and the substrate, and attached between the lens barrel and a portion of the lens barrel on the subject side in the optical axis direction of the housing to which the substrate is attached, A biasing member that biases the lens barrel in a direction in which the lens barrel is pressed against the substrate; and a driving member that drives the lens barrel. The driving member includes a coil and a magnet. One of them is arranged on the substrate, and the other of the coil and the magnet is arranged at a part of the lens barrel facing the coil or the magnet.

  According to the present invention, the lens for reducing the size of the lens barrel is swung while holding all the lenses for imaging the luminous flux of the subject on the imaging means, so that the shake correction function can be realized with a small and simple configuration. . Moreover, since the lens barrel is swung in units, the assembly workability is improved.

  The best mode for carrying out the present invention is as shown in Examples 1 to 4 below.

  FIG. 1 is a front view of a mobile phone, which is a portable device equipped with an image blur correction device, and includes casings 10 a and 10 b that can be folded by a hinge 11. Reference numeral 12 denotes a sub-display which displays a call / mail reception status and serves as a monitor for shooting in a folded state. Reference numeral 13 denotes an LED (light-emitting diode) for displaying a call or mail.

  2 is a cross-sectional view taken along the line AA of the mobile phone in FIG. 1, and the same parts as those in FIG. In FIG. 2, 12a is a sub-display protection window, and 13a is an LED window. Reference numeral 20 denotes a main camera unit provided with a shake correction device, and reference numeral 21 denotes a vibration detection unit. Reference numeral 20a denotes a protective window made of a transparent material. Reference numeral 22 denotes a substrate fixed to the housing 10a, on which an operation pad 210 made of conductive rubber or the like, an IC (integrated circuit) 22a, and the like are mounted. The operation pad 210 is provided with a decorative plate 210a. An image sensor described later of the main camera unit 20 is connected to a connector 20c on the substrate 22 by a flexible substrate 20b. Reference numeral 23 denotes a sub-board on which an IC 23a is mounted.

  Reference numeral 24 denotes a main display, which is used as a monitor at the time of a game or shooting together with display of a telephone number. Reference numeral 24 b denotes a flexible substrate for connection of the main display 24, which is connected to the connector 24 c on the sub substrate 23. Reference numeral 24a denotes a main display protection window. Similarly, the sub display 12 is also connected to the connector 12c by the flexible substrate 12b. Reference numeral 25a denotes an image sensor for the sub camera, 25b denotes an optical system for the sub camera unit, and 25c denotes a protective window. The imaging device 25a and the optical system 25b constitute a sub camera unit 25 (see FIG. 4). 26 is a speaker when using the telephone, and 27 is a microphone. 28 is a battery, and 28a is its lid. Reference numeral 29 denotes an antenna.

  FIG. 3 is a rear view of the mobile phone of FIG. 1, and the casing 10a, the protective window 20a, and the lid 28a shown in FIGS. 1 and 2 can be seen. Reference numeral 28b denotes a claw hook for opening the lid 28a.

  FIG. 4 shows a state where the mobile phone of FIG. 2 is opened. In this state, it is possible to take a picture while checking the video of the main camera unit 20 on the main display 24. Further, by using the sub camera unit 25 and the main display 24, it is possible to take a self-portrait and a videophone.

  FIG. 5 is a detailed cross-sectional view of the main camera unit 20, omitting members not directly related to the present invention.

  In FIG. 5, lenses 51 and 52 constituting a photographing optical system having a common optical axis 50 are accommodated in a lens barrel 53 having an aperture 53a on the objective surface. In addition, an imaging element 54 as imaging means is fixed on the substrate 22 so as to face the imaging optical system. As described above, the image sensor 54 is electrically connected to the substrate 22 by the flexible substrate 20b and the connector 20c (see FIG. 2). Here, the image sensor 54 may be directly mounted on the substrate 22. Here, the lenses 51 and 52 are all lenses for forming an image of a subject light beam on the image sensor 54.

  A ferromagnetic material yoke 57p is attached to the lens barrel 53, and a permanent magnet 58p such as neodymium is attracted and fixed to the yoke 57p. A rolling ball 55 is disposed in the recess 53 b of the lens barrel 53, and the rolling ball 55 is sandwiched between the substrate 22 and the lens barrel 53. The compression coil spring 56 is arranged to be charged between the housing 10 a and the lens barrel 53, and presses the lens barrel 53 against the substrate 22. Therefore, the rolling ball 55 does not come off the lens barrel 53. The compression coil spring 56 is tapered as shown in FIG. 5 so that it does not hit the lens barrel 53 when the lens barrel 53 swings in the direction of the arrow 132p. The lens barrel 53 is also centered by the elastic force of the compression coil spring 56 in the direction of the arrow 132p.

  The inner diameter portion 10 c of the housing 10 a faces the outer diameter portion 53 c of the lens barrel 53 with a slight gap, and regulates the swing range of the lens barrel 53. For this reason, the lens barrel 53 is not greatly swung due to a disturbance shock or the like, and no breakage occurs. A coil 59p is mounted on the substrate 22 so as to face the permanent magnet 58p. In the example of FIG. 5, the substrate 22 and the coil 59p are shown as separate components and are fixed by adhesion or the like, but the coil 59p may be a printed coil integrally printed in the substrate 22.

  When a current is passed through the coil 59p, the lens barrel 53 is driven in a direction substantially orthogonal to the optical axis 50 (in the direction of the arrow 132p parallel to the mounting surface of the image sensor 54 of the substrate 22). A position detector 510p such as a Hall element is mounted on the substrate 22 and detects the swing amount of the lens barrel 53 in relation to the opposing permanent magnet 58p.

  The vibration detection unit 21 is a vibration gyro mounted on the surface of the substrate 22 opposite to the main camera unit 20 and detects a rotational angular velocity around the arrow 21a and around the arrow 21b orthogonal thereto. The vibration detection unit 21 is illustrated as an example in which the vibration detection unit 21 is configured with a vibration gyro that detects rotation about the two axes, but two single-axis detection vibration gyros are arranged in the detection direction. May be.

  As shown in FIG. 5, when the vibration detector 21 is mounted on the surface opposite to the main camera unit 20, the mounting area can be effectively used, and the whole can be compactly assembled.

  FIG. 6 is a front view of the main camera unit 20. As described with reference to FIG. 5, the lens barrel 53 is provided with the permanent magnet 58p via the yoke 57p. However, the yoke 57y and the permanent magnet 58y are also provided in the direction orthogonal thereto. In FIG. 6, the yokes 57p and 57y are shown by outline only in order to illustrate the permanent magnets 58p and 58y. The rolling balls 55 are arranged at three positions with respect to the lens barrel 53. Although the rolling ball is not actually visible in the front view of FIG. 6, the arrangement is shown for explanation.

  FIG. 7 is an enlarged front view of the substrate 22 near the main camera unit 20. Coils 59p and 59y are arranged on the substrate 22 at positions facing the permanent magnets 58p and 58y of FIG. Position detection units 510p and 510y are mounted at the centers of the coils 59p and 59y. Further, a metal pattern 60 such as a copper foil is provided at a position for receiving the rolling ball 55 in FIG. 6 so that the rolling ball 55 rolls smoothly. The imaging element 54 is fixed to the substrate 22 and is electrically connected to the substrate 22 via the flexible substrate 20b and the connector 20c.

  6 and 7, when a current is passed through the coils 59p and 59y, the lens barrel 53 is swung in two directions indicated by arrows 132p and 132y.

  FIG. 8 is a block diagram illustrating a circuit configuration of a main part of the image blur correction apparatus. Angular velocity signals from the vibration gyro which is the vibration detector 21 (differentiated to 21p and 21y for detecting the angular velocity in the biaxial direction) are input to the signal processors 81p and 81y. In the signal processing units 81p and 81y, the angular velocity signals are integrated and converted into angle signals, and DC components are removed and panning measures are taken to convert them into image blur correction target values. A current is applied to the coils 58p and 58y based on the obtained target value, and the lens barrel 53 starts to swing for image blur correction. The position detectors 510p and 510y construct a known feedback control with a negative feedback (broken line 83) configuration that detects the swing of the lens barrel 53 and applies current to the coils 58p and 58y. For this reason, the lens barrel 53 is accurately driven according to the image blur correction target value.

  In the first embodiment, the image blur correction is performed by fixing the imaging device 54 to the substrate 22 of the mobile phone and swinging the lens barrel 53 having the photographing optical system including the lenses 51 and 52 with respect to the substrate 22. Since the apparatus is configured, the shake correction apparatus is downsized, thereby contributing to downsizing of the mobile phone. In addition, the lenses 51 and 52 are all lenses for forming an image of the subject light flux on the image pickup device, and both are incorporated in the lens barrel 53 to form an integral unit, which contributes to an improvement in assembly workability. ing.

  FIG. 9 is a cross-sectional view showing the vicinity of the main camera portion of the mobile phone according to the second embodiment of the present invention. Portions similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The difference from FIG. 5 is that the permanent magnets 58 p and 58 y are provided on the substrate 22, and the coils 59 p and 59 y are provided on the lens barrel 53. Accordingly, the yoke 57p is also provided on the substrate 22, and the yoke 90p is provided on the housing 10a to close the magnetic path.

  When the magnetic path is closed as described above, it is possible to reduce the influence of magnetic noise during photographing or when using a mobile phone, and to increase the magnetic flux density penetrating the coils 59p and 59y. Therefore, driving efficiency can be increased.

  FIG. 10 is a sectional view showing the vicinity of the main camera portion of the mobile phone according to the third embodiment of the present invention. Portions similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the mobile phone according to the third embodiment, the compression coil spring 100 is provided between the lens barrel 53 and the housing 10a, and the position detection units 510p and 510y are omitted. The protective window 20a is provided with a print 101 that hides the compression coil spring 100.

  The compression coil spring 100 is hung so that the lens barrel 53 is aligned with the center of the image sensor 54. If necessary, the protective window 20a is removed, and spring adjustment (replacement with an optimal spring so that the optical axis 50 of the lens barrel 53 and the center of the image sensor 54 are aligned) can be performed.

  In the first and second embodiments, feedback control is performed. However, in the third embodiment of the present invention, the position of the lens barrel 53 is adjusted by causing a current to flow through the coils 59p and 59y so as to generate a thrust balanced with the spring 100. I have control. Therefore, the position detectors 510p and 510y can be omitted, and an image blur correction apparatus can be realized with a simple configuration.

  FIG. 11 is a cross-sectional view showing the vicinity of a main camera portion of a mobile phone according to Embodiment 4 of the present invention. Portions similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The difference from the first to third embodiments described above is that the lenses 51 and 52 in the lens barrel 53 are movable in the direction of the optical axis 50 and perform focus adjustment and zoom, respectively.

  The lens 51 is held by a holding frame 51 a, and the outer diameter of the holding frame 51 a is fitted with the inner diameter of the lens barrel 53. Therefore, although it can move in the direction of the optical axis 50, it cannot move with respect to the lens barrel 53 in the direction perpendicular to it (the direction of arrows 132p, 132y). Similarly, the lens 52 is held by a holding frame 52 a, and the outer diameter of the holding frame 52 a is fitted with the inner diameter of the lens barrel 53. Therefore, it can move in the direction of the optical axis 50, but cannot move with respect to the lens barrel 53 in the direction perpendicular thereto (directions of arrows 132p and 132y).

  The holding frame 51a is urged in the direction of the arrow 51f by a compression coil spring 51b. An arm 51d is provided so as to face the urging force. The arm 51d is slidable in the direction perpendicular to the optical axis 50 (directions of arrows 132p and 132y) with respect to the holding frame 51a. Similarly, the holding frame 52a is urged in the direction of the arrow 51f by the compression coil spring 52b. An arm 52d is provided to face the urging force. The arm 52d is slidable in the direction perpendicular to the optical axis 50 (directions of arrows 132p and 132y) with respect to the holding frame 52a.

  The arm 51d is screwed to a focus motor 51c having a screw shaft through a nut 51e. Therefore, when the focus motor 51c is rotated, the lens 51a moves in the direction of the optical axis 50 and performs focus adjustment. Defocus for focus adjustment is detected by a change in contrast of an image formed on the image sensor 54, that is, a so-called TV-AF method. The arm 52d is screwed to a zoom motor 52c having a screw shaft through a nut 52e. Therefore, when the zoom motor 52c is rotated, the lens 52a moves in the direction of the optical axis 50 and performs a zooming operation. The zooming amount is adjusted by the photographer while confirming the size of the subject on the main display 24 or the like.

  The operation of the lens barrel 53 in the direction perpendicular to the optical axis 50 (arrows 132p and 132y) is performed by passing a current through the coils 59p and 59y so as to generate a thrust balanced with the spring 100, as in the third embodiment. The position of the lens barrel 53 is controlled.

  As described above, the lenses 51 and 52 constituting the photographing optical system are each held in the lens barrel 53, but they are driven in the direction of the optical axis 50 by the focus motor 51c and the zoom motor 52c outside the lens barrel 53. It is configured to adjust the focus and zoom. Therefore, the size and weight of each motor do not become a driving load for the lens barrel 53 by the image shake correcting means.

  The image blur correction apparatus in the mobile phone has been described above as an example. However, since the image blur correction apparatus can be reduced in size, it can be applied not only to the mobile phone but also to mobile devices and mobile terminal devices. it can.

It is a top view which shows the mobile telephone which concerns on Example 1 of this invention. It is AA sectional drawing of FIG. It is a reverse view which shows the mobile telephone which concerns on Example 1 of this invention. It is sectional drawing which shows the expansion | deployment state of the mobile telephone which concerns on Example 1 of this invention. It is sectional drawing which shows the main camera part vicinity of the mobile telephone which concerns on Example 1 of this invention. It is a top view which shows a part of image blur correction apparatus with which the main camera part of the mobile phone which concerns on Example 1 of this invention was equipped. It is a top view which shows a part of image blur correction apparatus with which the main camera part of the mobile phone which concerns on Example 1 of this invention was equipped. 1 is a block diagram illustrating a circuit configuration of an image shake correction apparatus according to Embodiment 1 of the present invention. It is sectional drawing which shows the main camera part vicinity of the mobile telephone which concerns on Example 2 of this invention. It is sectional drawing which shows the main camera part vicinity of the mobile telephone which concerns on Example 3 of this invention. It is sectional drawing which shows the main camera part vicinity of the mobile telephone which concerns on Example 4 of this invention. It is a perspective view which shows the conventional anti-vibration camera. It is a perspective view which shows the image blur correction apparatus of the conventional vibration-proof camera.

Explanation of symbols

10a housing 20 main camera unit 20a protective window 21 vibration detection unit 22 substrate 51, 52 lens 53 lens barrel 54 imaging element 55 rolling ball 56 compression coil spring 57p, 57y yoke 58p, 58y permanent magnet 59p, 59y coil 510p, 510y position Detection unit

Claims (5)

Imaging means;
A substrate holding the imaging means;
A lens barrel having a photographing optical system in which a plurality of lenses are arranged in the optical axis direction ;
Three rolling members sandwiched between the lens barrel and the substrate;
The lens barrel is attached between the lens barrel and a portion on the subject side of the optical axis direction of the lens barrel in the casing to which the substrate is attached, and is urged to press the lens barrel against the substrate. A force member;
A drive member for driving the lens barrel;
The driving member includes a coil and a magnet, and either the coil or the magnet is disposed on the substrate, and the other of the coil and the magnet is disposed at a part of the barrel facing the coil or the magnet. A portable device characterized by that. Vibration detecting means for detecting the shake of the device;
Further comprising control means for calculating the drive amount of the lens barrel based on the detection result of the vibration detection means;
The portable device according to claim 1, wherein the driving unit drives the lens barrel based on a driving amount calculated by the control unit. It further has a position detection means for detecting the position of the lens barrel,
The position detecting means is provided on a surface of the substrate on which the imaging means is fixed, and the vibration detecting means is provided on a surface of the substrate different from the surface on which the imaging means is fixed. The portable device according to claim 1 or 2 . Among the substrate, the portable device according to any one of claims 1 to 3, characterized in that a metal pattern portion receiving at least the rolling member. The imaging optical system, any one of claims 1 to 4, wherein a portion of said plurality of lenses performs a zoom operation and / well focusing operation by moving in the direction of the optical axis of the imaging optical system Item 1. A portable device according to item 1 .

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