JPH0267878A - Video camera - Google Patents

Abstract

PURPOSE:To prevent useless operations by standing by for recording when a lens is not mounted yet or it is incompletely mounted. CONSTITUTION:A microcomputer 6 outputs a control signal to circuits 8-10 based on switch information selected by a mode switch 4 and discriminates whether or not a lens 1 is already mounted in a prescribed position based on a signal from a detecting switch 2A. When the lens 1 is not fitted, the whole system stands by in a stop mode, and after the mounting of the lens 1 is completed, a picture-recordable condition is automatically obtained and it waits for a picture-recording start instruction. When the lens 1 is not mounted yet or imperfectly mounted, the picture-recording is inhibited like this, therefore, imperfect continuous photographing and the wasteful power consumption of a battery can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video camera with interchangeable lenses, in which recording operation is controlled by detecting the lens attachment state. .

[Conventional technology]

Camera systems with interchangeable lenses have so far been mainly incorporated into silver halide eye reflex cameras, and have become widely popular because they allow a variety of photographs to be taken that take advantage of the characteristics of each lens.

In recent years, there has been a growing need to introduce such a lens exchange system to video cameras and to shoot videos that are different from those of the past.

[Problem to be solved by the invention]

If an exchange system is introduced into a video camera, for example, when recording is started without a lens attached or with a lens attached incorrectly, the tape will essentially be running blank, and the tape will have to be rewound and taken again. This not only results in missed photo opportunities, but also affects the amount of battery power consumed in continuous shooting.

Furthermore, in the case of a video camera using an optical finder, it is not possible to check the shooting status, so there is a problem in that the video camera continues to take out-of-focus images.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video camera that solves the above problems.

[Means for Solving the Problems] The present invention provides a detection means for detecting the wearing state of an interchangeable lens;
It is characterized by comprising means for stopping recording when the detecting means detects that the device is not attached.

[Function] According to the present invention, if the lens is not attached (incorrectly attached), recording is prohibited to prevent the tape from running idle, thereby preventing poor splicing and unnecessary battery power consumption. Can be done.

(Embodiment) Fig. 1 is a block diagram of an embodiment of the present invention, in which 1 is an exchangeable lens, 2 is a lens holder that constitutes a part of the camera body, and is a side mount to which the lens is attached. A lens attachment terminal (protrusion) IA is provided at the base end of the lens 1, and a detection switch 2A is provided on the mount 2, which is turned on by the attachment terminal when the lens 1 is attached to a predetermined position (attachment is completed). 3 is an imaging means (CO
D), which converts the optical image obtained through the lens 1 into an electrical signal.

4 is a mode selection switch, which includes switches for recording, playback, fast forward, rewind, stop, line/camera switching, etc.

5 is a power switch, and 6 is a microcomputer, which has a CPU, a RAM having a temporary storage area for data, and a ROM storing a program (FIGS. 2 and 3) to be described later.

A recorder 7 records a video signal on a loaded videotape or reproduces a video signal from a recorded videotape.

Reference numeral 8 denotes a video signal processing circuit of the camera section, which separates the signal from the imaging means 3 into, for example, a luminance signal and a color signal, based on a control signal from the microcomputer 6, and outputs the signals. Reference numeral 9 denotes a recording/playback video signal processing circuit which performs processing such as FM modulation on the output signal from the camera section video signal processing circuit 8 so that it can be recorded on the video tape loaded in the recorder 7. The reproduced video signal is subjected to processing such as FM demodulation on the reproduced video signal from the recorder 7 and outputted. Switching between recording and reproduction in this circuit 9 is performed based on a control signal from the microcomputer 6.

Reference numeral 10 denotes a recorder drive control circuit, which controls drive of the recorder 7 in a mode based on a drive mode selection signal from the microcomputer 6, and inputs the resulting drive information from the recorder 7.

The power to each circuit 8, 9, 10 is turned on and off by a switch 5 via a microcomputer 6.

The microcomputer 6 sends a control signal to each circuit 8.9.10 based on the switch information selected by the mode selection switch 4.
to use human power. The microcomputer 6 also determines whether the lens 1 is completely attached to a predetermined position based on a signal from the detection switch 2A.

Next, the operation of this embodiment will be explained with reference to FIG. When the program starts, step Sl (hereinafter S only) determines whether the power supply is 0N10FF, and S2 determines whether the camera/
Determination of line mode: In S3, it is determined whether the lens has been completely attached. Sl, S2. If S3 is Yes, Rec Pause @ is processed in S4, and Re is processed in S5.
c Determine whether the Start button has been pressed and press Y.
If it is es, Rec 5tart processing is performed in S6. Next, it is determined in S7 whether or not the Rec Pause button has been pressed, and if it has not been pressed, it is determined in S8 whether or not the 5top button has been pressed, and if it has been pressed, it is determined in S9.
Process Rec Pause with sio and 5t from Rec with sio.
Preparations for transition to the OP state are made, and in Sll it is determined whether the preparations are complete, and when the preparations are complete, 5top processing is performed in S12 and the process ends. Note that if the camera mode is not set in S2, line recording or playback processing is performed in 513, and if the lens attachment is not completed in S3, 5top processing is performed in 514.

Whether or not lens attachment is complete is determined only when the camera mode is in effect after the power is turned on, and if no lens is attached, the entire device stands by in 5top mode (512, 14). After the lens is attached, the camera automatically enters a recording ready state (S4) and waits for a recording start command.

FIG. 3 shows another operation of the embodiment, and blocks having the same functions as in FIG. 2 are numbered the same.

In other words, in Fig. 2, the presence or absence of the lens attachment is only detected when the power is turned on, but in Fig. 3, the S
6 and 57, the step of determining whether the lens attachment is complete (5
15), and even if the lens comes off for some reason during recording, the entire device can be set to 5top mode (
514), the system waits for the completion of reinstallation of the lens.

Note that a program (S15) for shifting to the 5top mode when the lens is improperly attached may be provided at any location in the flowchart, and it is possible to shift to the 5top mode whenever the lens comes off.

〔Effect of the invention〕

As described above, according to the present invention, if the lens is not attached or if it is attached but incomplete, recording is put on standby, and tape running, rewind search, etc. It is possible to prevent unnecessary operations such as wasteful battery power consumption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts explaining the operation of this embodiment. Diagram

Claims (1)

[Claims] 1. A video camera comprising: a detection means for detecting whether an interchangeable lens is attached; and means for stopping recording when the detection means detects that an interchangeable lens is not attached.