JPH04372936A - Video camera - Google Patents

Abstract

PURPOSE:To allow recording concurrently with the start of photographing by setting a recording means recorder to the record waiting state when a lens fitting recognizing means judges that lenses are fitted to a camera main body. CONSTITUTION:A video camera capable of fitting or removing lenses 1-3 has a lens fitting recognizing means 26 detecting that the lenses 1-3 are fitted to a camera main body and outputting the lens fitting information and a control means S receiving the lens fitting information and controlling a recording means to the record waiting state. The lens fitting recognizing means 26 detects the fitting of the lenses 1-3 when the lenses 1-3 are fitted to the camera main body and outputs the lens fitting information. The control means S receives the lens fitting information from the lens fitting recognizing means 26 and controls the recording means to the record waiting state. The recording means is automatically set to the record waiting state by this control and can perform recording concurrently with the start of photographing. The means 26 is practically a switch short-circuiting the signal from a camera micro-computer 25 to the ground.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a video camera with a detachable lens.

0002

2. Description of the Related Art Conventionally, in a video camera with a removable lens, the attachment of the lens is unrelated to the recorder, and when the recording is stopped to replace the lens, the recorder is inevitably stopped. Even after the lens was attached, the recorder remained stopped.

0003

[Problems to be Solved by the Invention] However, in the above conventional example, when the lens is attached, the recorder remains in the state before attachment. Even if the camera is still in a stopped state and you want to change the lens and start shooting immediately,
Recording standby state (hereinafter referred to as REC), in which the recorder starts recording in conjunction with the start of shooting by manually operating the button on the recorder.
This required the troublesome effort of starting shooting and recording after the camera was in a pose (called a pause).

[0004] Furthermore, there is also the problem that photo opportunities are lost.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a video camera that can take pictures and record images as soon as the lens is attached, even if the lens is removed for lens replacement or the like. This is the purpose.

[0006]

[Means for Solving the Problems] Therefore, the video camera according to the present invention is a video camera in which a lens can be attached and detached, and which detects that a lens is attached to a camera body and outputs lens attachment information. With a configuration characterized by comprising a wearing recognition means and a control means for inputting the lens wearing information and controlling the recording means to a recording standby state,
This aims to achieve the above objectives.

[0007]

[Operation] With the above structure, the lens attachment recognition means provided in the video camera with a removable lens detects attachment of the lens and outputs lens attachment information when the lens is attached to the camera body. Then, the control means inputs the lens attachment information from the lens attachment recognition means and controls the recording means to be in a recording standby state. By this control, the recording means automatically enters a recording standby state, and can record at the same time as the start of photographing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a video camera according to the present invention will be explained with reference to embodiments. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 1 is a focus lens, 2 is a zoom lens group, 3 is a relay lens group, 4 is a focus encoder, 5 is a zoom encoder, 6 is an iris encoder, 7 is a focus motor, 8 is a zoom motor, 9 is an iris driver, 10 is a lens It is a control device, and the above-mentioned parts constitute a lens section L, which can be attached to and detached from the camera body C. When attached, a communication line is also connected, and the lens control device 10 communicates control information with the control device S of the camera body C. The configuration allows communication such as

Next, the configuration of the camera body C will be explained. 20 is an image sensor, 21 is an amplifier, 22 is a process circuit, 23 is a band pass filter, 24 is a detection circuit, 25
26 is a microcomputer that controls the camera unit (hereinafter referred to as a camera microcomputer), and 26 is a lens unit L that controls the camera body C.
It automatically turns on when attached to the camera microcontroller 2.
A lens attachment recognition switch 27 short-circuits the signal from 5 to ground, a microcomputer (hereinafter referred to as a recorder microcomputer) that controls a recorder that is a recording means, and the recorder to be controlled can be built into the camera body C or as a separate unit. It may be configured to connect a control communication line for control. Reference numeral 28 denotes an auto-iris circuit, which generates a signal to control the opening degree of the iris to achieve appropriate exposure conditions.

Next, the operation of the embodiment will be explained. Light from the subject passes through the lens groups 1, 2, and 3 and the aperture 6a, reaches the image sensor 20, and is converted into an electrical signal. Then, it is amplified by the amplifier 21 and the signal processing circuit 22 outputs N.
It is converted into a video signal such as TSC and output to a recorder built into a video camera or an external recording device or playback device.

The electric signal amplified by the amplifier 21 is band-limited by a bandpass filter 23, detected by a detection circuit 24, and inputted to a camera microcomputer 25 as a focus evaluation signal. Further, the electrical signal amplified by the amplifier 21 is input to the auto iris circuit 28 and then input to the camera microcomputer 25 as an auto iris evaluation signal.

The camera microcomputer 25 sends control data to the lens via a communication line based on the auto-iris evaluation signal and focus evaluation signal. The lens control device 10 controls the optical system in accordance with the control data.

FIG. 2 shows the camera microcomputer 25 of the above embodiment.
1 is a flowchart showing the operation of the embodiment, and the operation of the embodiment will be described with reference to the same figure. Step S0 is a declaration of procedures related to start. Step S1 is a program that determines that the lens is attached, that is, that the lens attachment recognition switch 26 is turned on. Step S2 is execution of a program that determines whether initial communication with the lens can be performed. Step S3 is a program to set the SET flag to 0, step S4 is a program to output the SET flag to the recorder, step S5 is a program to perform initial communication, step S6 is a program to perform automatic focusing control (hereinafter referred to as AF), and step S7 is a program to perform automatic focusing control (hereinafter referred to as AF). The program that performs control communication, step S8, sets the SET flag to 1.
Step S9 is a program that outputs a SET flag to the recorder.

Next, the operation of each of the above steps will be explained. The process starts from step S0, proceeds to step S1, determines whether or not a lens is attached, and if so, proceeds to step S2. If it is not attached, the process proceeds to step S3, sets the SET flag to 0, proceeds to step S4, outputs the SET flag to the recorder, and proceeds to step S3.
Return to 1.

[0015] In step S2, it is determined whether initial communication can be performed normally. If communication can be performed normally, the process advances to step S5 and initial communication is performed. If communication cannot be performed normally in step S2, the series of operations of steps S3→S4→S1→S2 is repeated. In step S6, AF and automatic exposure control (hereinafter referred to as AE) data are calculated, and the process proceeds to step S7, where the control data of step S6 is sent to the lens. The process then proceeds to step S8, sets the SET flag to 1, outputs the SET flag to the recorder in step S9, and returns to step S1. These operations are performed at a cycle of 1V per revolution.

If the lens is properly attached and the communication is normal, the camera microcomputer 25 sets the SET flag to 1 and outputs it to the recorder, and if the lens is not attached and the lens attachment recognition switch 26 is off, or the communication is normal. If it is not normal, the program is designed to set the SET flag to 0 and output it to the recorder.

Next, control on the recorder side will be explained. FIG. 3 is a flowchart showing control by the recorder microcomputer 27, and will be described with reference to the same chart.

Step S10 is a start declaration, step S11 is a program that determines whether the SET flag 1V before was 0, and step S12 is a program that determines whether the current SET flag is 1.
The program for determining whether or not the recorder is in the REC pause state, step S13, is a program for setting the recorder to the REC pause state.

Next, the control operation in each of the above steps will be explained. Starting from step S10, it is determined in step S11 whether the SET flag 1V before is 0 or 1. If it is 0, the process proceeds to step S12, and if it is 1, step S11 is repeated. In step S12, it is determined whether or not the current SET flag is 1. If it is 1, the process proceeds to step S13, and if it is 0, the process proceeds to step S11.
Return to

In step S13, the recorder is placed in a REC pause. That is, the recorder microcomputer 27 changes from the SET flag to 0, that is, the lens is not attached, and when the SET flag changes from the uncontrollable state to 1, that is, when the lens is attached and becomes controllable, recording can be performed at the same time as shooting. Set the recorder to the REC pause state.

As described above, the lens attachment recognition switch 26 forms a lens attachment recognition means for detecting attachment of a lens to the camera body and outputting lens attachment information, and is composed of a camera microcomputer 25 and a recorder microcomputer 27. The control device S also constitutes a control means that inputs lens attachment information and controls a recorder, which is a recording means, to a recording standby state.

[0022]

As explained above, according to the present invention, when the lens attachment recognition means transitions from a state in which it is determined that a lens is not attached to the camera body to a state in which it is determined that a lens is attached, By placing the recorder in a recording standby state, recording can be performed simultaneously with the start of photographing.

That is, unlike conventional devices, there is no need for the troublesome operation of manually putting the recorder in recording standby mode before taking pictures, and problems such as mistakes in recording, delays in the start of shooting, and missed photo opportunities are avoided. It is possible to provide a video camera that does not cause any problems.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment.

FIG. 2 is a camera microcomputer control flowchart of one embodiment.

FIG. 3 is a recorder microcomputer control flowchart of one embodiment.

[Explanation of symbols]

C Camera body L Lens part S Control device (control means) 1, 2, 3, 5 Lens 10 Lens control device

Claims (1)

[Claims] [Claim 1] A lens attachment recognition means for detecting that a lens is attached to a camera body and outputting lens attachment information, and a control means for inputting the lens attachment information and controlling a recording means to a recording standby state. A video camera with a detachable lens.