JPH04172070A - Video camera - Google Patents

Abstract

PURPOSE:To eliminate an unnecessary video recording part, and to unnecessiate a troublesome operation for deleting the unnecessary part by providing a means discriminating whether enabling to control a lens or not, and making a video recording a prohibiting state when the lens becomes uncontrollable. CONSTITUTION:In a video camera to whose main body a photographing lens is attachable and detachable, a discriminating means 9 discriminating whether the lens is in a controllable state or an uncontrollable state, and a control means 8 prohibiting the video recording when the lens is in the uncontrollable state are provided. That is, when the lens becomes the uncontrollable state, the video recording is prohibited. Thus, in spite of the inappropriate photographing state, the unnecessary video is not recorded by touching a recording switch by mistake, and the troublesome operation for deleting the unnecessary part is unnecessiated.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a video camera with interchangeable lenses. (Prior Art) In a video camera system, it has been proposed to attach an interchangeable lens such as a still camera to the camera body of a general video camera. Video cameras such as these that are configured to have interchangeable lenses record with the lens properly attached, but if the lens is removed or the contacts between the lens and the camera body come into contact with each other, When a defect occurs, the lens becomes uncontrollable. At this time, if you accidentally touch the push-button recording switch, unnecessary video will be recorded even though proper photography cannot be done. In this case, to delete unnecessary recorded parts,
You will need to perform a predetermined operation such as rewinding later.

[Problem to be solved by the invention] For video cameras with interchangeable lenses like the one above, if you accidentally touch the recording switch when the lens is out of control, recording will occur when the shooting conditions are not appropriate, and unnecessary recorded portions may be deleted. However, there is a problem in that troublesome operations are required to do so. The present invention was made in view of the above-mentioned problems, and provides a video camera with interchangeable lenses that prohibits recording when the lens becomes uncontrollable, and does not require troublesome operations to delete unnecessary parts. The purpose is to obtain. Means to solve Section C]

The video camera of the present invention is a video camera in which an imaging lens is detachably attached to a camera body, and includes an identification means for identifying whether the lens is in a controllable state or an uncontrollable state;
It is equipped with a control means for prohibiting recording when the lens is in an uncontrollable state. (Function) In the video camera of the present invention, the identification means identifies whether the lens is in a controllable or uncontrollable state, and recording is prohibited when the lens becomes uncontrollable. [Embodiment] First The figure is a block diagram showing the configuration of a video camera with interchangeable lenses according to an embodiment of the present invention.In this video camera, a lens unit is detachably attached to the camera body using a mount part as a connecting part. , 1 is an imaging lens, 2 is an aperture, 3 is an image sensor, 4 is a preamplifier that amplifies the signal output from the image sensor 3, and 5 is a process circuit that processes the amplified signal. For example, a video signal of the NTSC system is output from 6. 6 is a band-pass filter (BPF) that limits the band of the output of the preamplifier 4, 7 is a detection circuit to which the band-limited signal is input, and 8 is an autofocus control circuit. A camera logic control section is used to perform auto-iris control, etc., and 9 is an identification switch for identifying whether or not the lens unit is properly attached to the camera body, and whether the lens unit is in a controllable or uncontrollable state. 10 is a communication path for performing control communication between the camera body and the lens unit, 11 is a lens logic control unit that controls the inside of the lens unit, and 12 is a communication path for controlling the aperture 2. 13 is a motor drive unit that drives a motor 14, which drives the lens 1 in the direction of the arrow; 15 is a zoom/focus encoder that detects the zoom and focus state; 16 is a zoom/focus encoder that detects the state of the aperture; The detecting aperture encoder 17 is a recorder logic control unit that controls recording. The camera logic control unit 8 constitutes a control means that prohibits recording when the lens is in an uncontrollable state. Next, the operation will be explained. Imaging light from the subject passes through the lens 1 and the aperture 2 and enters the image sensor 3. Then, a subject image is formed on the light-receiving surface of the image sensor 3. This subject image is photoelectrically converted by the image sensor 3, converted into a video signal, and inputted to the preamplifier 4, where it is amplified to an appropriate level and inputted to the process circuit 5. The output of the preamplifier 4 is converted into a standardized video signal and output to the outside.
The high frequency components contained in the video signal are extracted here. Then, the detection circuit 7 generates a signal corresponding to the absolute amount of the high frequency component, and this signal is input to the camera logic control section 8 as a signal for autofocus and auto iris control. The camera logic control unit 8 performs a logical operation on the signal to create autofocus and auto iris control data, and when it confirms that the lens unit is attached by the signal from the identification switch 9, it transmits the control data to the communication channel. 10 to the lens logic control section 11. The lens logic control section 11 operates the drive means 12 according to the control data, and also operates the motor drive section 13.
Chiyu 14 is operated via. The focus state and aperture state thus controlled are detected by each encoder 15, 16, and transmitted from the lens logic control section 11 to the camera logic control section 8 through the communication path 0. Here, the camera logic control section 8 places the recording in a prohibited state when the lens unit is in the IIJal disabled state as described above. That is, the communication data from the lens logic control section 11 is abnormal for a certain period of time (for example, 0.5 seconds or more), or the identification signal from the identification switch 9 indicating that the lens unit is not attached (L (low) level in the figure) When the signal) is input, a control signal is output to the recorder logic control section 17 to prohibit recording. For this reason,
Unnecessary recorded portions are eliminated, and the troublesome iz operation for deleting unnecessary portions is no longer necessary. FIG. 2 is a flowchart showing the processing operation of the camera logic control section 8. When the signal from the detection circuit 7 is input, a command (control data) for controlling the lens unit is determined in step 21 as described above, and in step 22
communication is performed to transmit the command to the lens unit. Then, in step 23, it is determined whether the data communication with the lens unit is normal, and if it is normal, the process returns to step 21. However, if the communication abnormality is not normal in step 23, the process proceeds to step 24, where it is determined whether the communication abnormality has continued for a certain period of time, and if it has not been within a certain period of time, the process returns to step 21. Proceed to step 25. And this step 2
At step 5, a permission signal for prohibiting recording is output to the recorder logic control unit 17, thereby prohibiting recording. Further, FIG. 3 is a flowchart showing the operation of the recorder logic control section 17. First, in step 31, it is determined whether recording is prohibited or not, and if recording is not prohibited, step 32
Go to and enable recording here. However, if &1 stroke is prohibited, the process proceeds to step 33, where recording is prohibited. Then, the process returns to step 31 and repeats the series of operations described above. In this way, for example, if the lens unit comes off and the lens unit becomes inoperable, the camera logic control section 8 detects this and outputs a recording prohibition signal to the recorder logic control section 17. That is, when the lens unit becomes uncontrollable, recording is prohibited. Therefore, unnecessary video will not be recorded by accidentally touching the recording switch even if the shooting conditions are not appropriate, and troublesome operations such as cueing to delete unnecessary parts will be avoided. It will no longer be necessary. (Effects of the Invention) As described above, according to the present invention, a means for identifying whether the lens is controllable or not is provided, and recording is prohibited when the lens becomes uncontrollable. This has the effect of eliminating unnecessary recorded parts and eliminating the need for troublesome operations to delete unnecessary parts.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
2 is a flowchart showing the operation of the camera logic control section shown in FIG. 1, and FIG. 3 is a flowchart showing the operation of the recorder logic control section shown in FIG. 1...Lens 2...Aperture 3...Image sensor 8...Camera logic control section (control means) 9...
. . . Identification switch (identification means) 10 --- Communication path 11 -- Lens logic control section 17 -- Recorder logic control section

Claims (1)

[Claims] A video camera in which an imaging lens is detachably attached to the camera body, and includes an identification means for identifying whether the lens is in a controllable state or an uncontrollable state, and a method for prohibiting recording when the lens is in an uncontrollable state. A video camera characterized in that it is equipped with a control means for controlling.