JP2017098721A - Adjustment mechanism for imaging element and photographing device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adjustment mechanism for an imaging element for preventing a positional deviation in a focus direction when inclination adjustment is performed by using a position adjustment mechanism for a lens barrel and the imaging element and to provide a photographing device using the adjustment mechanism for the imaging element.SOLUTION: An optical instrument includes a lens barrel member 101 which holds an imaging optical system, an imaging element 301 which converts a subject image after passing through the imaging optical system into an electrical signal, a holding member 302 which fixes and holds the imaging element, and a holding part which holds an optical element. A spherical projection centering on an imaging element light-receiving surface is formed in front of the imaging element holding member 302, a spherical recess centering on the imaging element light-receiving surface is formed behind the lens barrel member, and the projection of the imaging element holding member is moved along the recess of the lens barrel member, to adjust the inclination of an imaging surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image sensor adjustment mechanism, such as a video camera or a digital still camera, and an optical apparatus having the same.

  2. Description of the Related Art Electronic cameras represented by a video camera using an image sensor and a digital still camera that convert an object image formed by a photographing optical system into an electric signal have become widespread.

  In recent years, the number of photographic pixels has been increasing, and the permissible depth of focus has become shallower. Adopting an adjustment mechanism that corrects single blurring caused by tilting of the image sensor surface by adjusting the tilt of the image sensor An imaging device has also been proposed. Patent Document 1 proposes a lens barrel structure in which an image sensor unit is attached to an image sensor holder by a compression spring.

JP 2008-283358 A

  However, since the lens barrel of Patent Document 1 is a position adjustment mechanism using three screws and compression springs around the image sensor, there is a problem that the position in the focus direction is shifted when tilt adjustment is performed. It was.

In order to solve the above problems, an optical instrument according to the present invention is
A lens barrel member that holds the imaging optical system, an imaging element that converts a subject image that has passed through the imaging optical system into an electrical signal, a holding member that holds the imaging element fixedly, and the lens barrel member includes the optical member A holding portion that holds the element, and has a spherical convex portion centering on the light receiving surface of the image pickup element in front of the image pickup element holding member, and an image pickup element light receiving surface behind the lens barrel member. And the convex portion of the image sensor holding member moves along the concave portion of the lens barrel member, thereby adjusting the inclination of the imaging surface.

  According to the present invention, the front of the image sensor holding member has a spherical convex portion centered on the image sensor light receiving surface, and the rear of the barrel member has a spherical shape centered on the image sensor light receiving surface. By adjusting the tilt of the imaging surface by moving the convex part of the image sensor holding member along the concave part of the lens barrel member, the adjustment in which the position in the optical axis direction is difficult to shift during tilt adjustment. It is possible to provide an imaging device that has been made possible.

It is a block diagram of the imaging device (optical apparatus) of this embodiment. It is sectional drawing of the imaging device concerning embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of an imaging apparatus according to an embodiment of the present invention.

<First Embodiment>
In FIG. 1, L1, L2, and L3 are a first lens group, a second lens group, and a third lens group as variable power lens groups that perform a variable power operation by moving in the optical axis direction, respectively, and L4 is an optical axis. A fourth lens group L5 that performs a focusing operation by moving in the Z direction, L5 is a fixed lens group. The first lens unit L1 to the fifth lens unit L5 constitute a photographing optical system that forms an optical image of a subject.

  Reference numeral 1 denotes a moving member (lens holding frame) that holds the first lens group L1, 2 denotes a moving member (lens holding frame) that holds the second lens group L2, and 3 denotes a moving member (lens holding the third lens group L3). (Holding frame) 4 is a moving holding member (lens holding frame) for holding the fourth lens unit L4. Reference numeral 5 denotes a fixing member that holds the fifth lens unit L5. The movement holding member 1, the movement holding member 2, the movement holding member 3a, and the movement holding member 4 are supported so as to be movable in the optical axis Z direction of the photographing optical system.

  Reference numeral 6 denotes an aperture device that changes the aperture diameter of the optical system. The aperture device changes the aperture diameter by moving the aperture blade in the plane orthogonal to the optical axis by the drive unit 6a.

  An image pickup means 30 including an image pickup element such as a CCD or CMOS, a low-pass filter, an infrared cut filter, and the like is fixedly held in a fixed barrel 101 described later. A photographing signal is output to the camera signal processing circuit 31 through a signal line from the image sensor.

  The camera signal processing circuit 31 performs amplification, gamma correction and the like on the output of the imaging means. A signal subjected to amplification or gamma correction by the camera signal processing circuit 31 is output to the microcomputer 32.

  The microcomputer performs signal processing by taking in a large number of signals and outputs a large number of signals in accordance with an input signal to control the optical device. Reference numeral 33 denotes a recording means for recording an image signal processed by the microcomputer 32 and other recording conditions.

  Reference numeral 34 denotes an aperture sensor circuit that detects the rotational position of the drive magnet of the drive unit 6a with a Hall element. The microcomputer 32 outputs an aperture drive signal output to the aperture drive circuit 37 in accordance with an input signal from the camera signal processing circuit 31 and an input signal such as the rotation amount of the aperture drive unit from the aperture sensor 34 to adjust the light amount. .

  50 is a zoom switch for instructing a zooming operation, 51 is a focus switch for instructing a manual focus operation (focusing operation) consciously by the photographer, and 52 is a power switch.

  Reference numeral 7 denotes a cam ring for driving and holding the variable magnification optical system in the optical axis direction.

  Reference numeral 8 denotes a guide ring having a long hole that guides the variable magnification optical system in a straight line.

  A cam follower 3a is provided on the outer periphery of the moving member 3 so as to be distributed substantially evenly (every 120 degrees). The cam groove 7a of the cam ring 7 and the elongated hole of the linear guide guides the moving member 3 in the optical axis direction. I have decided the position.

  A cam follower 1 a is provided on the inner periphery of the moving member 1, and the position of the moving member 1 in the optical axis direction is determined by a pair of cam followers 1 a and a cam groove 7 b of the cam ring 7.

  A cam follower 2 a is provided on the outer periphery of the moving member 2, and the position of the moving member 2 in the optical axis direction is determined by the cam follower 2 a and the cam groove 7 c of the cam ring 7.

  When the zoom motor 10 rotates, the cam ring 7 rotates at a fixed position around the optical axis and moves by meshing interlocking between a gear 10 a attached to the output shaft of the zoom motor 10 and a gear portion 7 a provided on the cam ring 7. The members 1, 2, and 3 are moved to positions in the optical axis direction to perform a zooming operation.

  An arc-shaped encoder 9 is attached to the outer peripheral portion of the cam ring 7, and a zoom position is detected by a sensor 20 attached to the fixed barrel member.

  A diaphragm unit 6 is fixedly held on the moving member 3.

  An ultrasonic vibrator 11 is attached to a movable holding member (lens holding frame) 4 that holds the fourth lens unit L4, and an ultrasonic motor that can move and stop in the optical axis direction by friction with the slider 12. Is configured.

  The movement holding member 4 is supported by a pair of guide bars 106 and 107 (not shown) extending in parallel with the optical axis direction so as to be movable in the optical axis direction of the photographing optical system. Further, an encoder (not shown) is attached to the movement holding member 4, and the position in the optical axis direction is detected by the focus position sensor 21.

  When the power switch 52 of the camera is turned on, the zoom position is detected by the sensor 20. The movement holding frame 4 moves in the optical axis direction and stops at the target position so that the value of the position sensor 21 meets the position corresponding to the detected zoom position.

  The microcomputer 32 controls the fourth group drive circuit 36 based on the camera signal 31 from the image pickup means, vibrates the vibrator 11 with the drive signal, and moves the movable holding frame 4 in the optical axis direction to perform a focusing operation.

  When the zoom switch 50 is operated, the microcomputer 32 determines how the moving direction and moving speed are operated, and the zoom operation is performed.

  The zoom motor 10 receives a drive signal from the zoom drive circuit 35 in response to a control signal from the microcomputer 32 and rotates the cam ring 7 by a direction and an amount corresponding to the operation of the zoom switch 50. At this time, the microcomputer 32 performs feedback control based on the value of the sensor 20 that measures the position of the cam ring 7.

  The ultrasonic motor constituted by the ultrasonic transducer 11 and the slider 12 receives a drive signal from the fourth group drive circuit 36 by a control signal from the microcomputer 32 and moves by a direction and an amount corresponding to the operation of the zoom switch 50. The holding frame 4 is driven. At this time, the microcomputer 32 performs feedback control based on the value of the sensor 21 that measures the position of the movable holding frame 4.

  FIG. 2 is a cross-sectional view of the imaging apparatus according to the embodiment of the present invention.

  In FIG. 2, reference numeral 301 denotes an image sensor such as a CCD or a CMOS, which has a mounting terminal on the back surface of the package.

  Reference numeral 302 denotes a holding member for adhering and holding the image sensor 301, and 303 denotes a flexible printed board mounted on a terminal portion of the image sensor 301.

  Reference numeral 304 denotes an optical element such as a low-pass filter or an infrared cut filter, 305 denotes an elastic member that is disposed between the imaging element 301 and the optical element 304 and has an aperture through which a subject light beam passes, and 101a is provided in the fixed barrel 101. The image pickup means 30 is configured by 301 to 305.

  The holding member 302 of the imaging element has a spherical convex portion with the imaging element light receiving surface as the center in front of the holding member 302, and has the imaging element light receiving surface as the center behind the fixed barrel 101. It has a spherical recess.

  Next, a process of adjusting, fixing and holding the image sensor 301 in the imaging device will be described.

  Since the image pickup device 301 and the image pickup device 301 bonded and fixed to the holding member 302 have component variations and assembly errors, when the image pickup device 301 is assembled to the image pickup device, individual blur adjustment of the image pickup surface is performed. Do.

  The convex portion of the image sensor holding member biased by the spring force of a tool (not shown) can move along the concave portion of the lens barrel member.

  The imaging element holding member is rotated to adjust the inclination of the imaging surface so that the peripheral charts at the four corners of the tool chart are balanced.

  After the adjustment is completed, the image sensor holding member 302 is fixed to the fixed barrel 101 with the adhesive 102.

  As described above, the imaging apparatus according to the present embodiment has a spherical convex portion with the imaging element light-receiving surface as the center in front of the imaging element holding member, and the imaging element behind the barrel member. It has a spherical concave portion centered on the light receiving surface, and the convex portion of the image sensor holding member moves along the concave portion of the lens barrel member to adjust the inclination of the imaging surface. The adjustment that the position in the axial direction is difficult to shift is possible. The same applies to the structure in which the concave portion of the image sensor holding member moves along the convex portion of the lens barrel member.

  The image sensor adjustment mechanism of this embodiment can be applied to an image pickup apparatus (optical device) such as an electronic camera represented by a video camera and a digital still camera.

L1 first lens group, L2 second lens group, L3 third lens group,
L4 fourth lens group (competitive focus group), L5 fifth lens group,
1 holding member for the first lens group, 2 holding member for the second lens group,
3 holding member of the third lens group, 4 holding member of the fourth lens group,
5 5th lens group holding member, 7 cam ring, 8 rectilinear guide ring, 101 fixed barrel,
301 Image sensor, 302 Image sensor holding member, 303 Flexible printed circuit board,
304 Optical elements such as low-pass filters and infrared cut filters, 305 elastic members

Claims (4)

  A lens barrel member that holds the imaging optical system, an imaging element that converts a subject image that has passed through the imaging optical system into an electrical signal, a holding member that holds the imaging element fixedly, and the lens barrel member includes the optical member A holding portion that holds the element, and has a spherical convex portion centering on the light receiving surface of the image pickup element in front of the image pickup element holding member, and an image pickup element light receiving surface behind the lens barrel member. An optical apparatus having a spherical concave portion centered at the center, and the inclination of the imaging surface is adjusted by moving the convex portion of the imaging element holding member along the concave portion of the lens barrel member.   A lens barrel member that holds the imaging optical system, an imaging element that converts a subject image that has passed through the imaging optical system into an electrical signal, a holding member that holds the imaging element fixedly, and the lens barrel member includes the optical member A holding portion that holds the element, and has a spherical concave portion centered on the light receiving surface of the image pickup element in front of the image pickup element holding member, and an image pickup element light receiving surface behind the lens barrel member. An optical apparatus having a spherical convex portion at the center and adjusting the inclination of the imaging surface by moving the concave portion of the imaging element holding member along the convex portion of the lens barrel member.   A surface-mount type image pickup device having a mounting terminal on the back surface of the package, a flexible printed circuit board mounted on the terminal portion of the image pickup device, and a hole through which the image pickup device penetrates with a space in the peripheral portion The optical apparatus according to claim 1, further comprising a holding member, wherein the optical device is fixedly held by filling a hole in the imaging element and the holding member with a UV adhesive.   The optical apparatus according to any one of claims 1 to 3, wherein the imaging element holding member is a molded member.