JP2017097125A - Imaging element adjustment mechanism and photograph device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical apparatus with which it is possible to adjust the inclination of an image element holding member so that its position in optical axis direction hardly shifts.SOLUTION: In an imaging device comprising a lens barrel member for holding an imaging optical system, an imaging element for converting a subject image having passed through the imaging optical system into an electric signal, and a holding member for fixedly holding the imaging element, the lens barrel member being provided with a holding part for holding an optical element, the position of the holding member being determined by an adjustment screw 104 that sustains substantially the upper part of the optical axis on the rear side of the holding member and adjustment screws 105 and 106 that sustain the peripheral part on the rear side of the holding member, the holding member has, on the imaging element side, a spring member for urging the adjustment screws 104, 105, 106, and adjusts the position of the imaging element in the optical axis direction by the adjustment screw 104 and adjusts inclination by the adjustment screws 105, 106.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 the position of the holding member is adjusted by an adjusting screw 104 that receives a substantially upper optical axis on the back side of the holding member, and adjustment screws 105 and 106 that receive a peripheral portion on the back side of the holding member. In the determined imaging apparatus, the holding member has a spring member that biases the adjustment screws 104, 105, and 106 on the imaging element side, and the adjustment screw 104 adjusts the position in the optical axis direction of the imaging element. The tilt adjustment is performed by the adjusting screws 105 and 106.

  According to the present invention, the position of the image pickup element 301 in the optical axis direction is adjusted by the adjustment screw 104 that receives the substantially upper optical axis on the back side of the image pickup element holding member 302, and thereafter, the adjustment screw 104 is set at the apex and arranged at about 90 degrees. In addition, by adjusting the tilt with the adjusting screws 105 and 106 that receive the peripheral portion on the back surface side of the image sensor holding member 302, an optical device that enables an adjustment in which the position in the optical axis direction is difficult to shift during tilt adjustment can be provided.

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. It is sectional drawing of the imaging device concerning embodiment of this invention. 1 is a rear plan view of an imaging apparatus according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a block diagram of an imaging apparatus according to an embodiment of the present invention.

  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 perspective view of the imaging apparatus according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of the imaging apparatus according to the embodiment of the present invention. FIG. 4 is a rear plan view of the imaging apparatus according to the embodiment of the present invention.

  2, 3, and 4, 301 is an image sensor such as a CCD or CMOS, 302 is a holding member that adheres and holds the image sensor 301, and 303 is a flexible print mounted on a terminal portion of the image sensor 301 that penetrates the holding member 302. A through hole 303a is provided at the approximate center of the back surface of the image sensor.

  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 image sensor is regulated in the position perpendicular to the optical axis by fitting the positioning holes 302 a and 302 b provided in the holding member 302 and the positioning pins 101 b and 101 c provided in the fixed barrel 101.

  A fixing member 103 serving as an adjustment reference is disposed behind the imaging unit 30 in the optical axis direction, and the fixing member 103 is fixedly held on the fixed barrel 101 by screws or the like.

  Adjustment screws 104, 105, and 106 having tips or cones at their tips are screwed onto the fixing member 103, and the adjustment screws 104, 105, and 106 can be advanced and retracted in the optical axis direction by rotating.

  The image sensor holding member 302 is urged and held by the adjustment screws 104, 105, and 106 by three spring members 102 arranged in the fixed barrel 101.

  The spring member 102 is arranged at one location between the screws 105 and 106, and the other two locations are equally arranged at about 120 degrees to urge the screws 104, 105, and 106 with equal force. ing.

  The adjustment screw 104 is disposed at a position that receives the substantially upper optical axis on the back side of the image sensor holding member 302, and receives the back side peripheral portion of the image sensor holding member 302 at a position of approximately 90 degrees with the adjustment screw 104 as a vertex. Adjustment screws 105 and 106 are arranged.

  Next, a process of 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 that is 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 and Adjust the optical axis spacing.

  First, the holding member 4 that holds the fourth lens unit L4 that performs the focusing operation is moved to a predetermined design position. The adjustment screw 104 is rotated so that the center chart of the tool chart is focused at this position, and the image sensor 301 is moved in the optical axis direction.

  After focusing, the screws 105 and 106 are rotated to adjust the tilt 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 adjustment screws 104, 105, 106 and the image sensor holding member 302 are bonded and fixed to the fixing member 103.

  The fixing member 103 is provided with holes 103a and 103b for filling the adhesive 107 for fixing the image sensor holding member 302 between the adjusting screw 104 and the screw 105 and between the screw 104 and the screw 106. Thus, even when the adhesive is cured and contracted, the direction is the same as the direction of being urged by the spring, and the structure is such that no deviation occurs.

  As described above, the image pickup apparatus according to the present embodiment adjusts the position of the image pickup element 301 in the optical axis direction with the adjustment screw 104 that receives the substantially upper optical axis on the back side of the image pickup element holding member 302. Since the tilt adjustment is performed by the adjustment screws 105 and 106 that are arranged at approximately 90 degrees with the apex as the apex and receive the peripheral portion on the back side of the image sensor holding member 302, it is possible to perform an adjustment in which the position in the optical axis direction is difficult to shift during the tilt adjustment Yes.

  The image sensor adjustment mechanism of this embodiment can be applied to an image pickup apparatus (optical apparatus) 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,
102 spring member, 103 fixing member serving as an adjustment reference, 104 optical axis direction adjusting screw,
105, 106 Tilt adjustment screw, 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 (1)

  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 for holding an element, and the position of the holding member is determined by an adjusting screw 104 for receiving the upper part of the optical axis on the back side of the holding member and an adjusting screw 105 and 106 for receiving a peripheral portion on the back side of the holding member. In the image pickup apparatus, the holding member has a spring member biased to the adjustment screws 104, 105, and 106 on the image pickup element side, and the adjustment screw 104 adjusts the position in the optical axis direction of the image pickup element. An optical apparatus characterized in that tilt adjustment is performed by adjusting screws 105 and 106.