JPH0879582A - Television camera - Google Patents

Abstract

PURPOSE: To eliminate the need of severely managing the dimensions with a special jig or improving the precision of parts to simplify the parts by fixing an optical system, where an image pickup element is set, to an optical lens. CONSTITUTION: A supporting frame 8 and an optical system 2 with a solid-state image pickup element aligned to a lens optical axis 9 are fixed to the rear face of an optical lens 1 for television camera. A lens mount 6 has an engaging member 7 which is fixed to the upper part of the front, and this member 7 is engaged with the supporting frame 8 fixed to the lens 1 to fix and support the lens 1. Since the lens 1 is aligned to an optical axis and is attached/detached together with the combined optical system 2 at the time of attaching/detaching the lens 1 and a camera 3, the engaging member 7 in the attachment/detachment part between the camera 3 and the lens 1 doesn't cause the deviation of the optical axis 9, and any special jigs are not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in optical axis alignment structure in a television camera.

[0002]

2. Description of the Related Art In a television camera, an optical image input from an optical lens fixedly supported by a lens mount is passed through an optical system, and in the case of a color image, R (red), G (green),
After being decomposed into light image signals of the three primary colors of B (blue), they are converted into electric image signals by the image pickup device, and further subjected to various processes and output as video signals. By the way, in such a television camera, it is necessary to accurately match the optical axis of the optical lens with the optical axis of the optical system and the image pickup element integrated with the optical system. For example, suppose that the center 0 of the imaging surface coincides with the optical axis of the optical system during zoom-up photography, and a deviation amount Δt occurs between this and the optical axis 0 ′ of the optical lens. When the image is expanded to a wide image of X times from that state, the image located at the center 0 at the time of zoom-up shooting is moved by Δt (x−1) / x in the optical axis 0 ′ direction.

When this is viewed on the monitor screen, there is a case in which there is a considerable shift, and the portion to be photographed may extend off the screen. This becomes remarkable as the optical lens has a higher magnification. In particular, in the case where the solid-state image sensor is used as the image sensor for downsizing, the optical axis shift cannot be absorbed by the beam deflection adjustment unlike the case where the image pickup tube is used. Therefore, the optical axis shift is large. It becomes a problem. Further, there is an optical axis adjusting device for a TV camera disclosed in Japanese Patent Laid-Open No. 2-226876, but this technique has a large number of parts, and the constituent parts also have complicated shapes such as eccentric cams, which are costly. In addition, it takes time to assemble the components.

[0004]

Therefore, it is necessary to minimize the deviation of the optical axis between the optical lens and the optical system.
Conventionally, when assembling the engaging member of the attachment / detachment part of the optical lens and the television camera, which is a major factor of increasing the deviation of the optical axis, a special jig is used to tighten the dimensional control and improve the accuracy of the parts. There is no choice but to raise it, and even if the deviation is small at the time of assembly, the backlash of each member increases with time, and the deviation may increase, or the deviation may increase when the lens is replaced. Then, the deviation of the optical axis generated as described above was readjusted after assembling. An object of the present invention is to provide a structure in which the optical lens and the television camera attachment / detachment portion, which are such conventional problems, are not affected by the deviation of the optical axis.

[0005]

Therefore, according to the present invention, an optical image input from an optical lens is input via an optical system to an image pickup device mounted integrally with the optical system, and the image pickup device outputs an electric image signal. In a television camera that converts to and outputs the image, the image sensor integrated with the optical system is fixed to the rear part of the optical lens, and when the optical lens is attached to or detached from the television camera, the image is integrated with the optical lens. The structure is such that each element is attached and detached. The electric image signal converted by the image pickup device is connected to the output signal terminal attached to the optical lens side and the input signal terminal attached to the television camera side.

[0006]

As a result, even if the television camera is repeatedly attached and detached, since the image pickup element integrated with the optical system is fixed in accordance with the optical axis of the optical lens, the television camera shifts the optical axis. Never. Further, since the engaging member at the attaching / detaching portion between the optical lens and the television camera does not cause the optical axis to be displaced, a simple structure for fixing and supporting the optical lens is sufficient.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The television camera 3 has a lens mount 6 and an electric image signal input terminal 5 on the front surface. The optical lens 1 for a television camera has a support frame 8 and an optical system 2 with a solid-state image pickup device, which is aligned with the optical axis 9 of the optical lens, fixed to the rear surface thereof, and has an electric image signal output terminal 4. The lens mount 6 has a trapezoidal cross-section-shaped engaging member 7 fixed to an upper front surface, and by this, a supporting frame 8 fixed to the optical lens 1 is engaged to generate an optical lens for a television camera. 1 is fixedly supported.

This operation will be described below. When the optical lens 1 is attached to or detached from the television camera 3, the optical axis of the optical lens 1 is aligned with the optical lens 1, and the optical system 2 with a solid-state image pickup device is attached or detached. Therefore, the engagement member 7 at the attachment / detachment portion between the television camera 3 and the optical lens 1 does not cause the deviation of the optical axis.

[0009]

According to the present invention, when assembling the engaging members of the attachment / detachment portion of the optical lens and the television camera, it is not necessary to use a special jig to perform strict dimensional control or increase the accuracy of the parts. Therefore, the parts can be simplified. Further, by fixing and supporting the optical system with a solid-state image sensor on the optical lens side, the optical axes are made to coincide with each other, so that it is possible to realize a television camera in which there is no optical axis shift due to attachment and detachment of the optical lens.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Optical Lens for Television Camera 2 Optical System with Solid-State Image Sensor 3 Television Camera 4 Electrical Image Signal Output Terminal 5 Electrical Image Signal Input Terminal 6 Lens Mount 7 Engaging Member with Trapezoidal Cross Section 8 Optical Lens Support Frame

Claims (2)

[Claims] 1. A television camera having a detachable optical lens, wherein the optical lens has an optical system in which an image pickup device is attached to the optical lens. 2. The television camera according to claim 1, wherein the optical lens is configured to transmit an electric image signal output to the television camera side.