JP3085910U - CCD camera with tilted image receiving surface - Google Patents

Abstract

(57) [Problem] To provide a CCD camera that can easily focus on the entire field of view only by manual rotation when shooting a planar subject from an oblique direction. SOLUTION: CCD board 4 or its holder 5
The CCD image receiving surface 3 is tilted with respect to the optical axis 2 by fixing one end of a rotating rod 7 passed from the outside of the camera body 11 to the side of the camera body 11 and turning a rotary knob 8 provided outside the camera body 11. I decided to let it. However, here, the rotation axis 6 of the rotating rod 7 exists in the plane of the CCD image receiving surface 3 and overlaps with a horizontal line passing through the center of the CCD image receiving surface 3.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a camera with a tilt mechanism that can focus on the entire field of view even when a planar subject is photographed from an oblique direction.

[0002]

[Prior art]

 The CCD board of the conventional CCD camera is fixed to the camera body such that the CCD image receiving surface and the main plane of the camera lens are parallel, that is, perpendicular to the optical axis. Therefore, when it is necessary to image a subject (for example, a character string printed on paper) in an oblique direction, a sharp image cannot be formed over the entire subject plane, and a blurred area is included. An image is obtained.

In order to obtain a sharp image over the entire field of view even when a planar subject is photographed from an oblique direction, it is necessary to tilt the camera lens, the image receiving surface, or both at an appropriate angle with respect to the optical axis. . This tilt operation is usually called tilt correction. Cameras with a manual tilt compensation mechanism, which has a tilt mechanism on the camera lens and tilts the camera lens manually, have already become widespread. In addition, an automatic tilt correction method that performs an arithmetic operation on the automatically detected shooting conditions and parameters set by the photographer using an arithmetic unit and tilts the camera lens, the image receiving surface, or both at an appropriate tilt angle has been disclosed. (JP-A-8-190113).

[0004]

[Problems to be solved by the invention]

 The tilt correction method of manually tilting the camera lens has the problems that the field of view moves, the focus at the center of the image plane shifts, and the magnification changes due to the tilt movement of the camera lens. Therefore, to perform the tilt correction by tilting the camera lens while maintaining the same field of view, adjust the position, angle, and focus state of the camera with respect to the subject simultaneously with the tilting operation of the camera lens, and adjust the adjustment until the desired focus state is obtained. It had to be repeated. The automatic tilt correction method requires expensive and complicated systems, such as an automatic detection device for imaging conditions, a parameter calculation device, and an automatic tilt drive system, and the overall size of the camera tends to be large. In addition, if a camera lens with a different focal length and principal plane position is replaced, additional measures will be required.

In view of the above, the present invention provides a CCD capable of performing a correction by a manual rotation operation while maintaining the focus state at the field of view and the center of the image plane irrespective of the focal length of the camera lens and the position of the main plane. The purpose is to provide a camera.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, one end of a rotating rod 7 passed from the outside of the camera body 11 is fixed to the side of the CCD board 4 or the holder 5 thereof, and a rotating knob 8 provided outside the camera body 11 is fixed. By turning, the CCD image receiving surface 3 is inclined with respect to the optical axis 2. However, here, the rotation axis 6 of the rotating rod 7 exists in the plane of the CCD image receiving surface 3 and passes through the center of the image receiving surface.

[0007]

【Example】

 An embodiment of the camera of the present invention will be described with reference to the drawings.

FIG. 1 is a plan sectional view showing the configuration of a camera whose image receiving surface is inclined. The CCD board 4 is mounted on a frame-shaped holder 5, the end of a rotating rod 7 is fixed to one outer surface of the holder frame, and a rotating screw 9 is mounted on the other outer surface of the holder frame. The rotating shaft 6 of the rotating rod 7 and the rotating screw 9 is present in a plane including the CCD image receiving surface 3 and overlaps with a horizontal line passing through the center of the CCD image receiving surface 3. The optical axis 2 passes through the center of the image receiving surface 3. The other end of the rotating rod 7 is guided to the outside of the camera body 11 through a hole in the camera body 11, and a rotating knob 8 is adhered to the tip. Similarly, the other end of the rotary screw 9 is guided to the outside of the camera body 11 through a hole of the camera body 11, and a rotation stop nut 10 is fitted therein. The signal from the CCD board 4 and the lead wire 12 for power supply are loosened so as not to be tangled and entangled even when the CCD board 4 rotates, and connected to the lead wire connector 13 at the rear of the camera body. Have been.

When the photographer takes a picture of a flat subject 14 placed horizontally as shown in FIG. 2 from an obliquely upper right direction, first, the CCD image receiving surface 3 is not tilted and the target subject is not tilted. Select the field of view and focus on the center of the field of view. Since the plane subject 14 and the optical axis 2 of the camera lens 1 are not perpendicular to each other, a blurred image is observed in the peripheral portion of the visual field as in the image example shown in FIG. The change in the image is compared and observed while rotating the rotary knob 8, and when the amount of rotation is optimal, an image in focus is observed over the entire field of view as in the image example shown in FIG. When the entire surface of the subject is in focus, the rotation stop nut 10 is turned to prevent the CCD board 4 from rotating, thereby preventing unexpected vibration or malfunction.

[0010]

[Effect of the invention]

 In the CCD camera according to the first aspect of the present invention, since the center of the CCD image receiving surface is set on the axis of the tilt axis of the CCD image receiving surface, the CCD image receiving surface is tilted with respect to the optical axis along the tilt axis. However, there is a feature that the center position of the CCD image receiving surface does not change. Therefore, when photographing a flat object from an oblique direction, simply turning the rotary knob for tilting the image receiving surface will move the field of view with the rotating operation regardless of the focal length of the attached camera lens and the position of the main plane. It is possible to focus on the entire field of view without causing any defocusing of the entire field of view.

[Brief description of the drawings]

FIG. 1 shows a C in which a CCD image receiving surface of an embodiment of the present invention is tilted.
FIG. 2 is a plan sectional view showing a configuration of the CD camera.

FIG. 2 is an explanatory diagram showing a tilt operation of a CCD image receiving surface when capturing a planar subject.

FIG. 3 is an image example when the CCD image receiving surface is not tilted.

FIG. 4 is an image example when a CCD image receiving surface is tilted at an appropriate angle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera lens 2 Optical axis 3 CCD image receiving surface 4 CCD board 5 Holder 6 Rotating shaft 7 Rotating rod 8 Rotating knob 9 Rotating screw 10 Rotation stop nut 11 Camera body 12 Lead wire 13 Lead wire connector 14 Flat subject

Claims (1)

[Utility model registration claims] 1. An end of a rotating rod 7 passed from the outside of a camera body 11 is set to C so that a horizontal line passing through the center of the CCD image receiving surface 3 and the center thereof overlaps the rotating shaft 6 of the rotating rod 7.
Fix to the side of CD board 4 or its holder 5,
A CCD camera capable of tilting the CCD image receiving surface 3 with respect to the optical axis 2 by turning a rotary knob 8 provided outside the camera body 11.