JPH03136479A - Video equipment - Google Patents

Abstract

PURPOSE:To easily adjust an optical axis position relationship being a photographing lens and an image pickup part with high accuracy by providing an adjusting means on an adjusting base so as to move and adjust the photographing lens. CONSTITUTION:A main body 2 of a camera and a mount 3 are moved on a position adjusting surface 9 and the optical axis position of a photographing lens 1 is adjusted to an image pickup part 8. At such a time, however, a fitting vis 4 as the adjusting means is unfastened at a certain degree so that the backlash of the mount 3 can not be generated. Next, the mount 3 fitting the photographing lens 1 is adjusted by being moved on the position adjusting surface 9 of the main body 2 of the camera for making coincident the position relationship in horizontal, vertical and rotating directions to the optical axis of the image pickup part 8. After the adjustment, the fitting vis 4 is fastened and locked. Thus, even when using the image pickup part 8 fixing solid-state image pickup elements 7a-7c to one part of a color separation prism 6, the optical axis of the photographing lens 1 can be easily and high-accurately made coincident with the optical axis of the image pickup part 8.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a video device such as a color television camera or a color video camera that uses a solid-state image pickup device as an image pickup means, and particularly relates to a video device such as a color television camera or a color video camera that uses a solid-state image pickup device as an image pickup means. The present invention relates to a video device that can easily and accurately adjust the position W* relative to the axis.

(Prior art) Conventionally, in order to perform high-precision imaging with, for example, a television camera, the object image must be accurately positioned at a predetermined position on the imaging unit, that is, the optical axis must be in the horizontal, vertical, and rotational directions, and the object must be in focus. It is required that the position coincides with the optical axis direction with high precision.

BACKGROUND ART Conventionally, in television cameras that use an image pickup tube as an imaging means of an image pickup section, the optical axes of the photographing lens and the image pickup tube are aligned by electrically controlling the deflection of the electron beam of the image pickup tube.

Further, tracking in the optical axis direction including the rotational direction is performed using a tracking adjustment mechanism of the image pickup tube.

For example, FIG. 5 is a schematic diagram of a portion of a conventional mounting device for mounting a photographic lens on a camera body. As shown in the figure, conventionally, the position and assembly accuracy of the camera body side housing 2 and the photographing lens mount section 3 are determined by mechanical fitting.

In the figure, reference numeral 4 indicates a screw for attaching the mount portion 3 to the housing 2.

(Problem to be solved by the invention) However, when a solid-state image sensor, which has been rapidly put into practical use in recent years, is used in the image sensor, the arrangement of photoelectric elements is determined geometrically on the chip, and the image sensor Since it is configured by firmly adhering to the end face of the image resolving prism, either directly or via a fixture, the degree of coincidence between the intended imaging plane and the imaging plane is determined by the mechanical accuracy of the mechanism that supports it. Another problem is that it is difficult to electrically correct the positional relationship as in the conventional method.

Therefore, when a zoom lens is used as a photographic lens, there is a problem in that when zooming from the wide side to the telephoto side, the misalignment of the optical axis is emphasized and the image shifts, resulting in a deterioration of image quality. Regarding tracking, if the tracking adjustment of the image sensor of the TV camera is not performed accurately with a shooting lens that does not have a flange back adjustment mechanism on the shooting lens itself, the focus position may shift, the image may become blurred, or the image quality may deteriorate. There was a problem that it appeared.

The present invention fixes a solid-state image sensor to the exit surface of a color separation prism directly or through a fixture, and allows the image sensor to be moved and adjusted easily in a video apparatus that does not have an adjustment mechanism. An object of the present invention is to provide a video device suitable for a television camera, etc., which can adjust the optical axis positional relationship between a photographing lens and an imaging section with high precision.

Means for Solving Problem C) The video apparatus of the present invention has an adjusting means for moving and adjusting the photographing lens on the surface of the erroneous adjustment board when the photographing lens is attached to a predetermined position with respect to the imaging unit via the adjustment board. is provided, and the positional relationship between the optical axis of the photographing lens and the optical axis of the imaging section is adjusted by the adjustment means.

In particular, the present invention is characterized in that the adjustment means moves and adjusts the photographic lens horizontally, vertically, rotationally, and in the optical axis direction with respect to the surface of the adjustment board.

(Embodiment) FIG. 1 is a schematic diagram of a main part of an embodiment in which the present invention is applied to a color television camera.

In the figure, l is a photographic lens, for example, a zoom lens or the like. Reference numeral 2 denotes a camera body, and 3 a mount, which detachably connects the photographic lens l to the camera body 2. 4
The mount 3 is attached to the camera body 2 using screws. 5 is an infrared cut filter, a color temperature conversion filter, a filter member of the ND filter list, and 6 is a color separation prism, which separates the light beam incident from the photographing lens l into three colored lights, for example red, green, and blue. are doing.

7a, 7b, and 7C are solid-state imaging devices, each of which is fixed to the exit surface of the color separation prism 6 either directly or via a fixture. Reference numeral 8 denotes an imaging section, which includes a color separation prism 6 and solid-state imaging elements 7a, 7b, and 7C. 9 is an adjustment board, which also uses a part of the camera body 2, and mount 3.
This corresponds to the position adjustment surface.

In this embodiment, the camera body 2 and mount 3 are placed on the position adjustment surface 9.
The optical axis position of the photographing lens 1 is adjusted with respect to the imaging section 8 by moving the lens 1 upward. At this time, first, the screw 4 used as the adjusting means is loosened to an extent that the mount 3 does not play.

Next, the mount 3 to which the photographic lens l is attached is moved horizontally (H direction) and vertically (V direction) to the optical axis of the imaging section 8.
And in order to match the positional relationship in the rotation direction (0 direction),
Adjustments are made by moving the camera body 2 on the position adjustment surface 9. At this time, the optical axis position adjustment method for finding the best position on the position adjustment surface 9 of the photographic lens l is to use, for example, a pattern projection device with a built-in suitable pattern instead of the photographic lens l, and actually use a color television camera to match the desired position. The pattern may be photographed and displayed on a monitor as a video signal, and the pattern may be observed while being observed on the monitor surface.

Alternatively, the measurement may be performed while being detected using a measuring device such as an oscilloscope.

After adjusting the position of the photographic lens l on the position adjustment surface 9, the mounting screw 4 is tightened and locked. In this example, the method for adjusting the optical axis position 1 is, for example, when a zoom lens is used as the photographic lens 1, the magnification is changed from the wide end to the tele end, and the optical axis position 1 is observed on the monitor screen at this time. You may also make adjustments while doing so.

In this embodiment, an adjustment board 9 is newly provided and attached to the mount 3 or the camera body 2, and the photographing lens l is moved using the adjustment board using a linear bearing or a micro head as a driving source. The optical axis position of the imaging unit 8 may be adjusted in the horizontal direction, vertical direction, or the like.

2 to 4 are schematic diagrams of the main parts near the adjustment board among other embodiments of the present invention. In this embodiment, an eccentric bottle is used as an adjustment means to perform position adjustment. 2. FIG. 3 shows a mount portion, and FIG. 4 shows a cross section of the position adjustment mechanism.

10 in the figure is an adjustment board, which includes a camera body 2 and a mount 3.
It is located between. 11a.

11b and llc are eccentric bins, 12 is an eccentric bin support plate, 13 is an L-shaped lock ring, and the eccentric bins 11a and 11 are
lb, llc are attached to the eccentric bottle support plate 12.

Reference numeral 14 is a screw for attaching the eccentric bottle support plate 12 to the adjustment board IO.

Reference numerals 15a and 15b are horizontal elongated holes provided in the g4 adjustment board lO, which are used to move the mount 3 in the direction of arrow 16, and are fitted into the eccentric pins lIa and 11c. 17
is a vertical elongated hole provided in the adjustment board 10, which is used to move the mount 3 in the direction of the arrow 18, and is fitted into the eccentric bottle llb. 19 is a lock lever.

When performing tracking adjustment in this embodiment, first move the lock lever 19 to the arrow En2 position to the extent that no play occurs.
Rotate in the opposite direction to the 0 direction to loosen. and eccentric bottle l
By rotating la and llb in the direction of arrow 21,
Adjustment board IO is aligned with arrow 1 through horizontal long holes 15a and 15b.
6 direction.

That is, it is moved in the vertical direction.

Next, in the same way, adjust the adjustment board 10 by using the vertical elongated hole 17 as indicated by the arrow 1.
8, that is, in the horizontal direction.

At this time, the position of the mount 3 is adjusted in the horizontal direction, vertical direction, and rotational direction (0 direction) by a combination of movements of the three eccentric bins lla, llb, and 11c.

In this embodiment, the position adjustment mechanism uses a method similar to that of the embodiment shown in FIG.

After adjusting the optical axis position, the lock lever 19 is rotated in the direction of arrow 20 to fix and lock the substrate lO to the camera body 2.

In each of the above embodiments, tracking was performed by adjusting the horizontal direction, vertical direction, and rotational direction, but it is preferable to adjust only the functions necessary for the target video device, such as only the horizontal direction and vertical direction. You can also perform tracking using

(Effects of the Invention) According to the present invention, even when using an imaging unit in which a solid-state image sensor is fixed to a part of a color separation prism, the optical axis of the photographing lens can be easily matched with the optical axis of the imaging unit with high precision. A video device particularly suitable for a television camera can be achieved. According to this belief invention, a video device has been achieved that has the feature that it can easily absorb variations between units of the imaging section, especially errors in the mounting position of the solid-state image sensor with respect to the fitting hole of the prism stand, and so-called optical axis misalignment. can do.

[Brief explanation of the drawing]

FIG. 1 is a schematic view of the main part of an embodiment when the present invention is applied to a color camera, FIGS. 2 to 4 are schematic views of the main part near the adjustment board of other embodiments of the invention, The figure is an explanatory diagram of a conventional mount part. In the figure, l is the photographic lens, 2 is the camera body, 3 is the mount,
4 is a screw for mounting, 5 is a filter member, 6 is a color separation prism, 7a, 7b, 7C are solid-state image pickup devices, 8 is an image pickup unit,
9.10 is an adjustment board, 11a, llb, liC are eccentric bins, 12 is an eccentric bin support plate, 13 is an L-shaped lock ring,
14 is a screw for installation, and 19 is a lock lever 1.

Claims (3)

[Claims] (1) When attaching the photographing lens to a predetermined position with respect to the imaging unit via the adjustment board, an adjusting means for moving and adjusting the photographing lens is provided on the surface of the adjustment board, and the optical axis of the photographing lens is adjusted by the adjusting means. A video device characterized in that the positional relationship between the image pickup section and the optical axis of the imaging section is adjusted. (2) The imaging unit includes a color separation prism that separates the light flux from the photographic lens into a plurality of colored lights, and a solid-state image sensor fixed to the exit surface of the color separation prism. 1. The video device according to 1. (3) The video apparatus according to claim 1, wherein the adjusting means moves and adjusts the photographic lens horizontally, vertically, rotated, and in the optical axis direction with respect to the surface of the adjustment board. (4) The video apparatus according to claim 1, further comprising a locking mechanism provided on a part of the surface of the adjustment board for fixing the photographic lens to the adjustment board after adjustment of the photographic lens.