JP2005070386A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging element mounting mechanism capable of making, swing and tilt adjustment with high accuracy by taking the distance from the center of an imaging surface to an installation position of an adjusting member longer. <P>SOLUTION: The imaging element mounting mechanism which can performance the swing and tilt adjustment of the imager in an optical axis direction by adjusting the adjusting member is adapted such that the mounting position of the adjusting member is provided on the side outer than a cylindrical member constituting a lens barrel. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus such as a digital still camera and a video camera.

  Conventionally, in an image pickup apparatus such as a digital still camera using an image pickup device such as a CCD, since the focal depth of the lens on the image pickup surface of the image pickup device is shallow, a tilt adjustment mechanism is provided in the image pickup device mounting portion to provide an optical axis of the lens. The inclination of the image sensor with respect to can be adjusted.

A conventional image sensor mounting mechanism will be described with reference to FIGS. FIG. 6 is a main cross-sectional view of the image pickup apparatus, which includes an image pickup lens 101, an image pickup element 102, and a CCD plate 103 to which the image pickup element is integrally bonded and fixed substantially at the center. The optical low-pass filter 104 is inserted and fixed in a recess provided at the rear end of the lens barrel 109 so as to be disposed in front of the image sensor 102. Further, a CCD rubber 105 is installed between the image sensor 102 and the optical low-pass filter 104 to prevent dust near the image pickup surface of the image sensor 102. The CCD rubber 105 attaches the CCD plate 103 to the lens mirror. When attached to the tube 109, the imaging element 102, that is, the integrally fixed CCD plate 103 is attached in a direction away from the lens barrel 109 (upward in FIG. 6) by elastically deforming and repulsive force. To force. The compression spring 106 is disposed in two holes provided in the lens barrel 109 and urges the CCD plate 103 away from the lens barrel 109 in the same manner as the CCD rubber 105. When the CCD plate 103 is disposed on each of the above components, the rear end surface of the lens barrel 109 after three adjustment screws 107 are passed through the through holes provided in the CCD plate 103 as shown in FIG. The CCD plate 103 is disposed and fixed with respect to the lens barrel 109 by being screwed into the screw holes 108 provided in the lens barrel 108. Further, since the CCD plate 103 is biased in the direction away from the lens barrel 109 by the CCD rubber 105 and the compression spring 106 as described above, as a result, the heads of the three adjusting screws 107 are obtained. 107a abuts. The tilt adjustment of the image pickup surface of the image pickup element 102 is performed by changing the screwing amounts of the three adjustment screws 107 to change the inclination angle of the CCD plate with respect to the lens optical axis of the image pickup lens 101. Is possible.
JP-A-9-212536

  However, in the above conventional example, as shown in FIG. 7, the adjustment screw 107 is disposed inside the outer shape of the lens barrel 109. In addition to the photographing lens 101 and the optical low-pass filter 104 shown in FIG. 6, the lens barrel 109 includes components such as a focus mechanism and a lens barrier driving member that covers the front surface of the lens barrel. Therefore, the degree of freedom of installation of the screw hole 108 is originally limited. In recent years, the lens barrel has been downsized. However, when the lens barrel is downsized, the distance from the center of the imaging surface to the installation position of each adjustment screw is inevitably shortened. Since the ratio of the other constituent members in the cylinder increases, the installation positions of the screw holes are increasingly limited, making it difficult to take as long a distance as possible from the center of the imaging surface to each adjustment screw. In contrast to the current situation, in recent years, CCDs that are image pickup devices have been increasing in the number of pixels and the pitch of pixels has been narrowed. Therefore, higher accuracy of tilt adjustment has begun to be demanded. Because there is no longer distance from each adjustment screw to each adjustment screw, there is a problem that fine adjustment cannot be performed.

  Therefore, in the present invention, an imaging apparatus including an imaging lens and an imaging element is provided with an adjustment member that fixes a fixing member that fixes the imaging element to the lens barrel. By adjusting the adjustment member, the orientation of the imaging element is adjusted. In the image sensor mounting mechanism that performs adjustment, the distance from the center of the imaging surface to the installation position of the adjustment member is increased by providing the mounting position of the adjustment member outside the cylindrical member constituting the lens barrel. An object of the present invention is to provide an image sensor mounting mechanism that can be adjusted.

  According to a first aspect of the present invention, there is provided a lens group for forming an optical image, a lens barrel in which the lens group is disposed, and the lens group. In an imaging device comprising an imaging device that converts optical image information into an electrical signal, a fixing member that fixes the imaging device, an adjustment member that fixes the fixing member to the lens barrel, and the lens barrel And an urging member that urges the fixing member in the optical axis direction, and is an image sensor mounting mechanism that can adjust the image sensor in the optical axis direction by adjusting the adjustment member. The image sensor mounting mechanism is characterized in that the mounting position of the adjustment member is provided on the outer side of the cylindrical member constituting the lens barrel.

  According to this configuration, it is possible to increase the distance from the center of the imaging surface to the adjustment screw that performs tilt adjustment, and it is possible to easily perform fine tilt adjustment and perform high-precision adjustment.

  According to a second aspect of the present invention, the lens barrel includes: a lens holding tube that holds the lens group; and The imaging according to claim 1, comprising: a driving cylinder that applies an axial driving force; and at least one cylindrical member among the lens holding cylinder and the fixed cylinder that holds the driving cylinder. It is in the element mounting mechanism.

  As described above, according to the present invention, it is possible to increase the distance from the center of the imaging surface to the adjustment screw for adjusting the tilt, facilitating fine tilt adjustment, and performing high-precision adjustment. There is an unprecedented breakthrough effect.

  The best mode for carrying out the invention will be described below.

  FIG. 1 is a front view of an image pickup apparatus according to the present embodiment (an image pickup lens, a lens holding cylinder, and a shutter / aperture drive unit which will be described later are not shown). FIG. 2 is a main cross-sectional view AA of the image pickup apparatus in the present embodiment. FIG. 3 is a main cross-sectional view BB of the image pickup apparatus in the present embodiment. FIG. 4 is a rear view of the image pickup apparatus in the present embodiment. FIG. 5 is a distance comparison diagram from the center of the imaging surface to the adjustment screw attachment position.

  1 to 4, the image pickup apparatus according to this embodiment includes an image pickup lens 1 for guiding an optical image to the image pickup element, an image pickup element 2, a CCD plate 3 in which the image pickup element is integrally bonded and fixed substantially at the center, and a lens. A lens barrel 9 and a base member 10 are included. The lens barrel 9 is composed of three cylinder members, a fixed cylinder 11, a cam cylinder 12, and a lens holding cylinder 13. The fixed cylinder 11 is fixed to the base member 10. The cam cylinder 12 is fitted to the inner periphery of the fixed cylinder 11, and is lighted by a lens barrel driving device and a gear train which are not shown and connected to a gear portion (not shown) provided on the outer periphery thereof. It is driven to rotate around the axis. The cam cylinder 12 is sandwiched between a flange portion 11a provided at the distal end of the fixed cylinder 11 in the optical axis direction and the base member 10, and rotates around the optical axis without moving in the optical axis direction. Only allowed. The lens holding cylinder 13 includes three cam pins 13 a that engage with cam grooves 12 a formed on the inner periphery of the cam cylinder 12, and a rectilinear key that engages with a rectilinear key 14 that is fixed to the base member 10. And a groove 13b. Since the lens holding cylinder 13 is only allowed to advance straight by the rectilinear key 14, the lens holding cylinder 13 is driven along the cam groove portion 12 a without rotating as the cam cylinder 12 rotates. Advances and retracts in the optical axis direction. The base member 10 is provided with a driving member 10 a for driving a lens barrier (not shown) disposed on the front surface of the lens holding cylinder 13 in addition to fixing the fixed cylinder 11 and the straight advance key 14. Yes. The shutter / aperture driving unit 15 is fixed to the lens holding cylinder 13 and drives a shutter and an aperture (not shown) provided on the lens holding cylinder 13. The optical low-pass filter 4 is inserted into a recess provided in the base member so as to be disposed on the front surface of the image pickup device 2 and is bonded and fixed. Further, a CCD rubber 5 is installed between the image pickup device 2 and the optical low-pass filter 4 to prevent dust in the vicinity of the image pickup surface of the image pickup device 2, and the CCD rubber 5 has the image pickup device 2 fixed thereto. When the CCD plate 3 is attached to the base member 10, the imaging element 2, that is, the integrally fixed CCD plate 3 is separated from the base member 10 by the elastic deformation and the repulsive force (upper side in FIG. 3). Then, it is energized upward. The compression spring 6 is disposed in two holes provided in the base member 10 and urges the CCD plate 3 in a direction away from the base member 10 in the same manner as the CCD rubber 5. When the CCD plate 3 is disposed on each of the above components, as shown in FIG. 4, three adjustment screws 7 are passed through the through holes provided in the CCD plate 3 and then the rear end surface of the base member 10 is formed. The CCD plate 3 to which the image pickup device 2 is fixed integrally is disposed and fixed to the base member 10 by being screwed into the provided screw holes 8 respectively. Further, since the CCD plate 3 is urged in the direction away from the base member 10 by the CCD rubber 5 and the compression spring 6 as described above, the heads 7a of the three adjusting screws 7 are consequently obtained. Abut. In the present embodiment, as shown in FIG. 1, the lens barrel 9 is provided with a wall or the like for disposing the linear key 14, the driving member 10 a, and the compression spring 6. The space for providing the screw hole 8 for the adjustment screw 7 inside the lens barrel 9 is very limited, and the distance from the center of the imaging surface to the installation position of each adjustment screw 7 is shortened. End up. Therefore, as shown in FIG. 4, the adjustment screw 7 is disposed at a position further outside the fixed cylinder 11 having the maximum outer diameter among the cylindrical members constituting the lens barrel 9. Thus, by adopting the configuration of the image sensor mounting mechanism in the present invention, the screw hole 8 of the adjustment screw 7 can be freely set regardless of the components inside the lens barrel 9 even if the lens barrel 9 is downsized. In addition to the arrangement, it is possible to increase the distance from the center of the imaging surface to the installation position of each adjustment screw 7 as compared with the imaging device of the conventional example.

  The direction of tilt adjustment with respect to the optical axis of the imaging lens of the imaging device 2 fixed integrally with the CCD plate 3 and the magnitude of the inclination angle are set so that one of the three adjusting screws 7 or each of them is in a predetermined direction. It is determined by changing the distance of each head 7a from the lens barrel 9 or by changing the screwing amount of the three adjusting screws 7 into the lens barrel 9. In this embodiment, since the screw hole for the adjustment screw is provided outside the tube member of the lens barrel, the distance from the center of the imaging surface to the installation position of each adjustment screw is long. Therefore, if the distance from the center of the imaging surface to the adjustment screw in the present embodiment is L1, and the distance from the center of the imaging surface to the adjustment screw in the conventional example is L2, the adjustment range of the inclination angle θ of the imaging element as shown in FIG. Are the same, the stroke width of the adjustment screw is h1 and h2, respectively. In this embodiment, it is possible to increase the stroke amount of the adjustment screw. Can be adjusted.

Front view of the image pickup apparatus in the present embodiment Main sectional view AA of the image pickup apparatus in the present embodiment Main sectional view BB of the image pickup apparatus in the present embodiment Rear view of the image pickup apparatus in the present embodiment Comparison of distance from the center of the imaging surface to the adjustment screw mounting position Main cross-sectional view of imaging device in conventional example Rear view of imaging device in conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging lens 2 Imaging element 3 CCD plate 4 Optical low-pass filter 5 CCD rubber 6 Compression spring 7 Adjustment screw 8 Screw hole 9 Lens barrel 10 Base member 11 Fixed cylinder 12 Cam cylinder 13 Lens holding cylinder 14 Straight advance key 15 Shutter / stop drive unit

Claims (2)

A lens group for forming an optical image, a lens barrel in which the lens group is disposed, and an image sensor that converts optical image information from the lens group into an electrical signal;
A fixing member for fixing the image sensor;
An adjustment member for fixing the fixing member to the lens barrel;
An urging member disposed in the lens barrel and urging the fixing member in an optical axis direction;
An image sensor mounting mechanism capable of tilting the image sensor in the optical axis direction by adjusting the adjustment member, wherein the mounting position of the adjustment member is provided outside the tube member constituting the lens barrel. An imaging apparatus characterized by that.   The lens barrel includes: a lens holding cylinder that holds the lens group; a driving cylinder that applies a driving force in the optical axis direction to the lens holding cylinder; and a fixed cylinder that holds the lens holding cylinder and the driving cylinder. The imaging apparatus according to claim 1, wherein the imaging apparatus includes at least one cylindrical member.

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