JP2007259166A - Tilt adjusting method for imaging device and camera apparatus including imaging device adjusted by the same method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save excessive labor or facilities in title adjustment by obviating an objective lens during the tilt adjustment and to attain the reduction of service cost when exchanging an imaging device. <P>SOLUTION: A title adjusting method for the imaging device includes steps of: disposing an imaging device 1 including an imaging plane 10 while facing a fixed plate 2; measuring the inclination of the fixed plate 2 to the imaging plane 10 in a three-dimensional manner, inclining the fixed plate and setting the imaging plane 10 and the fixed plate 2 in parallel; and adhering the fixed plate 2 and the imaging device 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera device such as a video camera or a digital camera, and more particularly to a camera device in which an image pickup device disposed in the back of a lens barrel is adjusted with respect to a lens optical axis.

In a digital camera, if the imaging surface of an imaging device such as a CCD is not exactly orthogonal to the objective lens, the image is not accurately focused on the imaging surface. Therefore, conventionally, a configuration for adjusting the tilt angle of the image sensor with respect to the optical axis of the lens, that is, so-called tilt adjustment has been proposed (see Patent Document 1). FIG. 6 is a sectional view showing the configuration. At the back of the lens barrel (3) where the objective lens (4) is provided, an image sensor (1) which is a CCD for focusing an image is provided. As described above, since the imaging surface (10) needs to be orthogonal to the lens optical axis L, a mechanism for adjusting the orientation of the imaging device (1) is provided at the base end of the lens barrel (3).
The tilt adjustment mechanism includes a screw (35) (35) that passes through the fixing plate (2) to which the image pickup device (1) is attached and is screwed into the lens barrel (3), and a screw ( 35) and a spring (36) biased toward the head. The image captured by the imaging surface (10) of the imaging element (1) is displayed on a display (not shown) via the flexible substrate (37).
During actual tilt adjustment, the image of the pattern (7) separated from the lens barrel (3) by a distance K is taken, the screw (35) is turned, and the pattern captured by the imaging surface (10) of the image sensor (1) While viewing the image, stop rotating the screw (35) with the optimum tilt adjustment amount.

JP 2003-134383 A

Conventionally, since the tilt adjustment is performed using the lens barrel (3) integrated with the objective lens (4), the scale of the equipment for performing the tilt adjustment has been increased. Further, since the pattern image is focused on the image sensor (1) every time the screw (35) rotates, it takes time to focus and time to turn the screw (35), and it takes time to adjust the tilt. It was. Further, even when the image pickup device (1) is supplied as a replacement service component, the image pickup device (1) can be supplied only by the lens barrel (3) incorporating the objective lens (4) and the image pickup device (1). In general, the objective lens (4) is expensive and incurs extra service costs.
An object of the present invention is to eliminate the need for an objective lens at the time of tilt adjustment, to save extra labor and equipment at the time of tilt adjustment, and to reduce the service cost at the time of image sensor replacement.

The tilt adjustment method of the image pickup device includes a step of disposing the image pickup device (1) having the image pickup surface (10) opposite the fixed plate (2),
The inclination of the fixed plate (2) with respect to the imaging surface (10) is measured three-dimensionally, and the fixed plate (2) or the imaging device (1) is moved up and down to move the imaging surface (10) and the fixed plate (2). A step of setting them in parallel;
A step of bonding the fixing plate (2) and the image sensor (1).

The image pickup device (1) measures the inclination of the fixed plate (2) with respect to the image pickup surface (10) three-dimensionally, and sets the image pickup surface (10) and the fixed plate (2) in parallel based on the result. In a state where the imaging surface (10) and the fixed plate (2) are set in parallel, the fixed plate (2) and the imaging element (1) are bonded. By attaching the fixing plate (2) to the lens barrel (3), the imaging device (1) is set in a state where the imaging surface (10) and the lens optical axis are orthogonal to each other.
Thereby, since the objective lens (4) is unnecessary at the time of tilt adjustment, it is possible to save extra labor and equipment at the time of tilt adjustment. Moreover, the service cost at the time of image pick-up element (1) exchange can also be aimed at. Furthermore, the spring (36) required in the conventional configuration shown in FIG. 6 is not required, and the number of components can be reduced.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a schematic diagram of a system for adjusting the tilt of an image sensor (1) having an image pickup surface (10). The image sensor (1) is supported by the receiving jig (52) and does not move. A fixed plate (2) is provided apart from the image sensor (1). The fixed plate (2) is held by an arm (51) and supported so as to be tiltable and horizontally movable with respect to the image pickup surface (10). The The arm (51) is connected to a moving mechanism (50) that moves the arm (51) up and down or horizontally, and the moving mechanism (50) is connected to a control means (5) that controls the operation of the moving mechanism (50). The control means (5) is connected to the non-contact three-dimensional measuring device (6), and the non-contact three-dimensional measuring device (6) obtains the inclination angle of the imaging surface (10) with respect to the fixed plate (2). Further, the horizontal position of the imaging surface (10) with respect to the fixed plate (2) may be obtained.

  FIG. 2 is a diagram showing the measurement principle of the non-contact three-dimensional measuring device (6). The non-contact three-dimensional measuring device (6) includes a light emitting element (60), a galvano mirror (61) that reflects light from the light emitting element (60) toward an arbitrary position, and an object to be measured (in this example) Comprises a fixed plate (2) and a sensor (62) for receiving the light reflected by the imaging surface (10). Since the distance L1 between the sensor (62) and the galvanometer mirror (61) and the reflection angle θ1 of the light by the galvanometer mirror (61) are known, if the sensor (62) detects the incident angle θ2 of the light, the triangulation From this principle, the distance L2 from the sensor (62) to the object to be measured is known. By changing the tilt angle of the galvanometer mirror (61), the distance to any point on the object to be measured can be determined. Further, the horizontal distance between the locations can be obtained by changing the tilt angle of the galvanometer mirror (61) and applying light from the light emitting element (60) to any location on the object to be measured.

During tilt adjustment tilt adjustment, first determine the distance to several points on the fixed plate (2) in a non-contact three-dimensional measuring device (6), a reference plane surface formed by connecting said numerical point. Next, a distance to several points on the imaging surface (10) is obtained, and a surface formed by connecting the several points is obtained. The control means (5) calculates a difference amount between the inclinations of the reference plane and the imaging surface (10), and moves the arm (51) up and down via the moving mechanism (50) based on the difference amount. Specifically, as shown in FIG. 1 (b), the fixing plate (2) is tilted in accordance with the imaging surface (10), and the imaging surface (10) and the fixing plate (2) are set in parallel. To do.
Note that the imaging plane (10) may be set as a reference plane, and the difference in inclination from the fixed plate (2) may be obtained. Alternatively, the image sensor (1) may be held and tilted by the arm (51).

  With the imaging surface (10) and the fixed plate (2) in parallel, as shown in FIG. 3, the UV curing adhesive (8) is placed between the imaging device (1) and the fixed plate (2). ) Is applied and the image pickup device (1) is bonded to the fixing plate (2). After the adhesive (8) is sufficiently cured, the imaging device (1) and the fixing plate (2) are removed from the arm (51) and the receiving jig (52), and as shown in FIG. 4, the lens barrel (3) Attach to the end opposite to the objective lens (4). From the applicant's experience, when the fixed plate (2) is attached to the lens barrel (3), the optical axis L of the objective lens (4) and the fixed plate (2) are often almost exactly orthogonal, The optical axis L of the surface (10) and the objective lens (4) is almost exactly orthogonal.

In this example, the inclination of the fixed plate (2) with respect to the image pickup surface (10) of the image pickup device (1) is measured three-dimensionally, and from the result, the image pickup surface (10) and the fixed plate (2) are parallel to each other. Set. In a state where the imaging surface (10) and the fixed plate (2) are set in parallel, the fixed plate (2) and the imaging element (1) are bonded. By attaching the fixed plate (2) to the lens barrel (3), the imaging surface (10) of the imaging device (1) and the lens optical axis L are set to be orthogonal to each other.
Thereby, since the objective lens (4) is unnecessary at the time of tilt adjustment, it is possible to save extra labor and equipment at the time of tilt adjustment. Moreover, since the objective lens (4) is expensive, it is possible to reduce the service cost when replacing the imaging device (1). Furthermore, the spring (36) required in the conventional configuration shown in FIG. 6 is not required, and the number of components can be reduced.
In recent years, high-precision tilt accuracy is required for a high-pixel imaging device (1). Specifically, for an image sensor (1) of 1 / 2.5 inch in which the horizontal width of the imaging surface (10) shown in FIG. 5 is 5.6 mm, the tilt amount is several tens of microns. Only a degree may be allowed. The tilt adjustment method of this example is effective when the tilt amount of the image sensor (1) or the image sensor itself that requires such a high tilt accuracy is large.

  In the non-contact three-dimensional measuring device (6), as described above, the horizontal distance between the imaging surface (10) and the fixed plate (2) can also be obtained. Therefore, if the arm (51) is moved in the horizontal direction (in the direction of arrow C in FIG. 1) based on the relative horizontal distance between the imaging surface (10) and the fixed plate (2), the objective lens (4) and the imaging are obtained. Horizontal position adjustment with the surface (10) is also possible. Thereby, it is possible to adjust the bias of luminance shading (brightness unevenness) and adjust the center of the imaging surface (10).

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

(a), (b) is the schematic of the system which carries out the tilt adjustment of the image pick-up element provided with the imaging surface. It is a figure which shows the measurement principle of a non-contact three-dimensional measuring device. It is a figure which shows the state which adhered the image pick-up element to the stationary plate. It is a figure which shows the state which attached the stationary plate to the lens-barrel. It is a top view of an image sensor. It is a figure which shows the conventional tilt adjustment mechanism.

Explanation of symbols

(1) Image sensor
(2) Fixed plate
(3) Lens tube
(4) Objective lens
(10) Imaging surface

Claims (4)

A step of disposing an image pickup element (1) having an image pickup surface (10) opposite to a fixed plate (2);
Measure the inclination of the fixed plate (2) with respect to the imaging surface (10) three-dimensionally, tilt the fixed plate (2) or the imaging device (1), and set the imaging surface (10) and the fixed plate (2) in parallel. And a process of
An orientation adjustment method for an image sensor, comprising a step of bonding the fixed plate (2) and the image sensor (1). The tilt adjustment method for an image sensor according to claim 1, further comprising a step of attaching the fixing plate (2) to which the image sensor (1) is bonded to the lens barrel (3). The image pickup device according to claim 1, further comprising a step of horizontally moving the fixed plate (2) or the image pickup device (1) when measuring the three-dimensional inclination of the fixed plate (2) with respect to the image pickup surface (10). Aori adjustment method. A fixed plate (2) set parallel to the imaging surface (10) of the image pickup device (1) and bonded to the image pickup device (1), and the fixed plate (2) is an optical axis of the objective lens (4). Camera equipment comprising a lens barrel (3) mounted orthogonally to L.

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