JPH02288484A - Video equipment - Google Patents

Abstract

PURPOSE:To attain excellent image pickup without provision of a mechanism adjusting the position of a solid-state image pickup element directly by providing a means moving a pickup section and adjusting it to match an image pickup face in a desired state on an equipment main body. CONSTITUTION:A screw 10 is loosened to a degree not causing a play, a knob 13 is turned to move a prism base 9 in the optical axis direction shown in the arrow 27 by a pin 11 and a slot 12. As a result, the image forming location of a pickup lens 1 and the image forming location of solid-state image pickup elements 6a-6c are made coincident. In this case, as the method to find out the best point of the focus, a proper chart is picked up actually by a color television camera, the video signal is detected visually by using a monitor or by using a measuring instrument such as an oscilloscope, the screw 10 is tightened after the adjustment to be locked. Thus, even after the solid-state image pickup element is fixed to an image separation prism, the image pickup state is compensated.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a video device equipped with a plurality of fixed image pickup devices such as a color television camera, and particularly relates to a video device including a plurality of fixed image pickup devices such as a color television camera. 11).

[Prior Art] In order to accurately capture an image with a television camera, it is required that the object image and the imaging device be accurately aligned, that is, the optical axes should be aligned, the horizontal and vertical directions should be aligned, and the rotational direction should be aligned. Conventionally, in television cameras that use an image pickup tube as an imaging device, 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 front-rear direction including the rotational direction is performed using a tracking adjustment mechanism of the image pickup tube.

However, in the case where a solid-state image sensor is used for the imaging unit, which has been rapidly put into practical use in recent years, the arrangement of photoelectric elements is determined geometrically on the chip, and moreover, it is firmly attached to the end face of the image resolving prism either directly or through a fixture. Since the target image plane and the imaging plane are bonded to each other, the degree of coincidence between the intended image plane and the imaging plane is determined by the mechanical accuracy of the mechanism that supports it. Furthermore, it is not possible to electrically correct the positional relationship as in the conventional case.

Therefore, when zooming from the wide side to the telephoto side with a zoom shooting lens, the misalignment of the optical axis is emphasized and the image shifts, resulting in a deterioration in image quality. Regarding tracking, lenses that do not have a flange hack adjustment mechanism on the shooting lens itself may cause the tracking adjustment of the TV camera's image sensor to be inaccurate, resulting in misalignment of the focus position, blurred images, and deterioration of image quality. It appears.

[Problems to be Solved by the Invention] The present invention aims to solve the above-mentioned problems, and makes it possible to realize good imaging since there are video devices that do not have a mechanism for directly adjusting the position of a solid-state imaging device. It is.

[Means for Solving the Problem 1] The apparatus main body is provided with a means for moving and adjusting the imaging section in order to align the imaging surface with the image plane of the objective system in a desired state. is equipped with an image resolving prism and a solid-state image sensor that receives each of the separated images.

[Example] Hereinafter, the present invention will be explained in detail using the drawings. First, the fourth
The figure shows an overview of a television camera, where l is a photographic lens such as a zoom lens, 2 is the television camera body including the workpiece and case, and 3 is a mount so that the photographic lens l and camera body 2 can be attached and removed at will. join in a similar manner. 4 is ND, C
Filters such as C, LP, and IR cut are diagrammatically drawn. Reference numeral 5 denotes a well-known image resolving prism which uses a dichroic film to separate the image produced by the photographing lens 1 into images of each color. 6a
, 6b.

Solid-state image pickup devices 6c are firmly fixed to the prisms either directly or via fixtures, facing each exit surface of the image resolving prism. In this example, an image resolving prism 5 and solid-state image sensors 6a and 6b.

6c will be referred to as an imaging section 7.

Next, FIG. 1 depicts the imaging unit 7 viewed from the rear (right side in FIG. 4), and an adjustment mechanism characteristic of the present invention has been added. Figure 2 is a view of Figure 1 from the left side. FIG. 3 shows a horizontal cross section of the main part 18a of FIG. Note that the notations "horizontal" and "vertical" are for convenience, and essentially refer to two orthogonal directions on a plane. In addition, equivalent parts are given the same number.

In the figure, reference numeral 8a is an adjustment board, and 8b is a support plate.The support plate 8b is erected perpendicularly to the adjustment board 8a, and supports the image resolving prism 5 via a prism stand 9. In FIG. 2, 10 is a screw for fixing the prism stand 9 to the support plate 8b, 11 is a positioning pin attached to the support plate 8b, and 12 is a long screw that is opened in the prism stand 9 and fits into the positioning pin 11;
13 is a tracking adjustment knob, 14 is a spring for always pressing the image resolving prism 5 in one direction, 15 is a spring stop attached to the ninth prism and has a spring applied thereto, and 16 is a spring stop attached to the support plate 8b. be. On the other hand, 17a and 17b are eccentric pins, 18 is an eccentric pin support plate, and 19 is an eccentric pin support plate 1.
L-type lock ring for attaching to 8. 20 is a screw for attaching the eccentric pin support plate 18 to the adjustment board 8a. Reference numeral 21 is a horizontal elongated hole that is drilled in the workpiece 2 of the camera body and that fits into the eccentric pin 17a in order to move the imaging section 7 in the direction of the arrow 22. 23 is a vertical elongated hole drilled in the workpiece 2 and fitted into +7b in order to move the imaging unit 7 in the direction of the arrow 24. 25 is a lever of a locking mechanism.

In the above configuration, the effect of tracking adjustment will be explained first. Loosen the screw 10 as shown in Figure 2 to the extent that no looseness occurs. By turning the knob 13, the prism base 9 is set to pin 1.
1. It is moved in the direction of the optical axis indicated by the arrow 27 by the elongated hole 12.

As a result, the imaging position of the photographing lens l and the solid-state image sensor 6a,
The image planes of 6b and 6c coincide.

At this time, the best way to find the focus point is to actually photograph an appropriate chart with a color television camera and detect the video signal visually using a monitor, or by using a measuring device such as an oscilloscope. It is. After adjustment, tighten and lock screw 10.

Next, make adjustments in the horizontal, vertical, and rotational directions.

Loosen the lock lever 25 by turning it in the opposite direction of the arrow 26 to the extent that no rattling occurs. By rotating the eccentric pin 17a in the direction of arrow 28, the adjustment board 8a is moved by the elongated hole 21 in the direction of arrow 22, that is, in the vertical direction.

Further, the adjustment board 8a is moved in the direction of the arrow 24, that is, in the horizontal direction, by the elongated hole 23. 3 eccentric pins +7a, 17
The imaging unit 7 can be adjusted horizontally, vertically, and in the rotational direction by combining the movement of the adjustment board 8a with the rotation of b.

In this poem, there are two ways to align the relationship between the optical axis and the center and rotation direction of the solid-state image sensor: focus alignment,
You can make the same adjustment, or as a simple method, use a zoom lens as the photographic lens and adjust it so that the optical axis does not shift on the monitor at the wide end and telephoto end.

After adjustment, turn the lock lever 25 in the direction 26 to lock it. Note that this configuration may have a structure in which the lock can be easily released, or it may be difficult to release the lock.

In the above explanation, the water movement, vertical direction, rotation, and tracking adjustment have been described. Of course, horizontally, 37 is a signal processing circuit and a solid-state photographing element 6a.

[Other Examples] In the above example, one key! Alternatively, the Li board could be moved horizontally and vertically, or there could be two adjusting boards, each with a linear bearing so that they can move orthogonally, and a micro head or the like used as a drive source to adjust the horizontal and vertical directions independently. Conceivable.

Also, Fig. 5 shows a device for electrically carrying out the adjustment.
0 is a chart projector mounted in front of the photographing lens l; a chart 31, a projection lens 32. An illumination light source 33 is provided. It is assumed that alignment of the center of the chart 31, the optical axis of the projection lens 32, and the optical axis of the projection lens l is ensured with high precision. The chart design includes a mark 35 that allows the center and rotation to be detected, as shown in the drawing on the monitor 34.
It consists of three bars arranged with optical path differences so that the front and rear focus positions are slightly off the focal plane and depth of focus.

It is sufficient to process the signals from Δ, or in order to eliminate various errors, each signal may be used to minimize each position error. The horizontal, vertical and rotational position shift signals obtained by detecting the mark 35 are sent to the motor drive circuit 37.
The driver 38 and the like connected to each eccentric pin are independently driven through the eccentric pins to eliminate misalignment. The driver may include a motor, a reduction gear train, and an eccentric pin drive float. on the other hand,
For adjustment in the optical axis direction, the mark 36 is detected, the driver 40 is driven so that the signals of the bars on both sides disappear, and the tracking adjustment knob is rotated. The front pin and the rear pin can also be determined depending on which signal of the bars on both sides appears.

Incidentally, the present invention can also be applied to a video device for reading information, etc.

[Effects of the Invention] According to the present invention described above, it is possible to compensate for the imaging state even after the solid-state imaging device is fixed to the image resolving prism.

Furthermore, even when replacing the photographing lens or the imaging section, it is possible to obtain the best positional relationship.

In addition, it has the effect of easily absorbing variations between units of the imaging section, especially errors in the mounting position of the CCD':g solid-state imaging device with respect to the fitting hole of the prism stand, so-called optical axis deviation.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a partial sectional view, and FIG. 4 is a diagram showing the entire optical arrangement. FIG. 5 is a diagram for explaining the electrical adjustment method. In the figure, 2 is the TV camera body, 5 is the image resolving prism, and 6
a, 6b, 6c are solid-state image sensors, 8a is an adjustment board, 8b
is a support plate, 13 is a tracking adjustment knob, 17a, 1
7b is an eccentric bottle, 21,2:l is a long hole. 25 is a lever of a locking mechanism.

Claims (6)

[Claims] (1) A video device characterized in that the device body is provided with means for moving and adjusting the imaging section to a desired position with respect to the photographing lens, so that the relationship between the optical axis, focus position, etc. of the photographing lens and the imaging section coincides with each other. . (2) The imaging unit includes an image resolving prism that decomposes image light from the front photographing lens and a solid-state image sensor, and the solid-state image sensor is coupled to the image resolving prism. Video equipment. (3) The video device according to claim 1, wherein the imaging unit moves horizontally, vertically, rotationally, and in the front-rear direction. (4) The video apparatus according to claim 1, wherein the moving mechanism is provided with a locking mechanism for fixing the moving mechanism after adjustment. (5) In a video device equipped with a mount section for attaching and detaching a photographing lens, an image resolving prism for image resolving the light emitted from the photographing lens and a solid-state image sensor coupled to the image resolving prism are provided. . A video device, comprising: a device for positioning and fixing the solid-state image pickup device relative to the video device so that it receives an object image formed by the photographing lens in a predetermined state; (6) The video device according to claim 5, wherein the position adjustment is performed at least in horizontal, vertical, and rotational directions.