JP2743411B2 - Video camera equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera device including a camera device main body including an image pickup unit for obtaining a video signal, and a lens device mounted on the camera device main body.

[Summary of the Invention]

The present invention relates to a video camera device including a camera device main body including an imaging unit for obtaining a video signal, and a lens device mounted on the camera device main body, wherein the camera device main body and the lens device can communicate with each other. The camera device main body includes a transmission and reception terminal and a power supply of the microcomputer and a power supply voltage output terminal of the microcomputer, and the lens device includes a reception and transmission terminal of the microcomputer and a power supply voltage input terminal. When the lens device is attached to the camera device main body, between the transmission terminal of the camera device main body and the reception terminal of the lens device, between the reception terminal of the camera device main body and the transmission terminal of the lens device, the power supply voltage output terminal of the camera device main body and Connecting means for electrically connecting the power supply voltage input terminals of the lens device to each other; An electric connection between the camera device main body and a lens device mounted on the camera device main body, by having a current detecting means provided in the main body for detecting whether or not a power supply current flows between a power supply and a power supply voltage output terminal. The state can be easily detected.

[Conventional technology]

In a conventional optical still camera device, a plurality of lens devices (interchangeable lenses) having different optical characteristics are prepared for a camera device main body, and a lens device arbitrarily selected from the plurality of lens devices is replaced with a camera device. What is used by attaching to a main body is widely used.

On the other hand, also in a video camera device provided with an image pickup means for obtaining a video signal, a plurality of lens devices (interchangeable lenses) having different optical characteristics are prepared for the camera device main body, and arbitrarily selected from the plurality of lens devices. Lens device
It becomes very convenient if it is used by attaching it to the camera device body. Such a video camera device is described, for example, in Japanese Patent Application No. 63-422745, which is unknown at the time of filing the present application.

[Problems to be solved by the invention]

2. Description of the Related Art In a video camera device, a moving image is picked up by an image pickup means such as a CCD and converted into an electric signal, that is, a video signal.

Such a video camera device is divided into a camera device main body and a lens device, and as the lens device, from among a plurality of lens devices having different optical characteristics such as telephoto, wide-angle, and zoom lens devices each having a different focal length, When one arbitrary lens device is selected and used by being mounted on the camera device body, the camera device body performs automatic control such as automatic focus control, automatic exposure control, and automatic white / black balance control. In this case, the control mode differs depending on the optical characteristics of the lens device, that is, for example, the focal length, the F-number, the spectral characteristics, and the like. Also, the types of optical characteristics that can be controlled differ depending on the lens device.

In view of such a point, an object of the present invention is to propose a video camera that can easily detect an electrical connection state between a camera device main body and a lens device attached thereto.

[Means for solving the problem]

A video camera device according to the present invention is a video camera including: a camera device main body including an imaging unit for obtaining a video signal, a viewfinder to which a video signal from the imaging unit is supplied, and a lens device mounted on the camera device main unit. In the device, the camera device main body and the lens device each include a microcomputer capable of communicating with each other, the camera device main body includes a transmission and reception terminal of the microcomputer, a power supply, and a power supply voltage output terminal,
The lens device includes a receiving and transmitting terminal of the microcomputer and a power supply voltage input terminal. When the lens device is mounted on the camera device main body, the lens device is provided between the transmitting terminal of the camera device main body and the receiving terminal of the lens device, and the camera. Connecting means for electrically connecting between a receiving terminal of the apparatus main body and a transmitting terminal of the lens apparatus, a power supply voltage output terminal of the camera apparatus main body and a power supply voltage input terminal of the lens apparatus, and a power supply provided in the camera main body. And current detection means for detecting whether or not a power supply current flows between the power supply voltage output terminals, so that a current detection signal from the current detection means is supplied to a microcomputer on the camera device body side. When the current detecting means detects that the power supply current does not substantially flow between the power supply and the power supply voltage output terminal, An electrical connection disable signal is generated from the microcomputer, and based on the electrical connection disable signal, the viewfinder displays an electrical connection disable signal, and communication between the microcomputers of the camera device body and the lens device. Is to be stopped.

[Action]

According to the present invention described above, if the mounting of the lens device with respect to the camera device main body is not reliable, the connection means causes the connection between the transmission terminal of the camera device main body and the reception terminal of the lens device, the reception terminal of the camera device main body, and the transmission of the lens device. Between terminals,
If the electrical connection between the power supply voltage output terminal of the camera device main body and the power supply voltage input terminal of the lens device is not made at all or is incomplete, the current detection means will cause a substantial connection between the power supply and the power supply voltage output terminal. It is detected that the power supply current is not flowing, and at this time, an electrical connection disable signal is generated from the microcomputer, and based on the electrical disable signal, the viewfinder displays an electrical disable status. In addition, the communication between the microcomputers of the camera device main body and the lens device is stopped.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

First, the overall configuration of the video camera device will be described with reference to FIG. This camera device includes a camera device main body (1) and an interchangeable lens device (2). The camera device body (1) and the interchangeable lens device (2) are provided with separate microcomputers (3) and (4), respectively, and these microcomputers (3) and (4) communicate with each other. It is made to be able to do.

Next, the configuration of the camera device body (1) will be described.
(5) denotes an image sensor, which is formed of a CCD, for example. The imaging device (5) receives imaging light from the imaging lens (16) of the lens device (2) and forms a subject image on the imaging surface. The video signal from the image sensor (5) is amplified by an amplifier (6), and then supplied to a recording device (8) through a video signal processing circuit (7) to be recorded. As the recording device (8), a VCR of a helical scan system, a magnetic disk recording device, an optical recording device, and the like can be used, and it also has a reproducing function.

The video signal from the video signal processing circuit (7) is supplied to the optical information detection circuit (9). In the optical information detection circuit (9), various kinds of information such as the in-focus state of the subject image projected on the image pickup surface of the image pickup device (5) by the image pickup lens (16) and the light amount thereof are obtained from the video signal supplied thereto. Optical information is detected and the detection signal is sent to a microcomputer (11)
Supplied to To detect this in-focus state, for example,
The high frequency component may be extracted from the video signal obtained from the imaging element (5), and the state in which the level of the high frequency component becomes maximum may be detected as the in-focus state. The light amount may be determined by detecting the level of the video signal.

A manual data selection switch (12) is connected to the microcomputer (11), and a data selection signal corresponding to the switching state, for example, switching of the zoom state of the imaging lens (16) is transmitted to the microcomputer (11). ).

(10) is a power supply such as a battery, whose positive and negative power supply terminals are
It is connected to the microcomputer (11), the recording device (8), and the circuits of the respective units, whose connection states are not shown.

(11) is a current detecting means. The power supply voltage from the power supply (10) is passed through the contacts (25) and (26) that come into contact with each other when the lens device (2) is mounted on the camera device body (1). It is provided in a current path supplied to the lens device (2). The current detection signal from the current detection means (11) is supplied to the microcomputer (3).

When the current is not detected by the current detecting means (11) or when the current is weak,
The microcomputer (3) generates an electrical connection disable signal, and the CRT of the viewfinder (14)
(15) The electric connection disabled is displayed on the tube surface.

A vertical synchronizing signal Sv from a synchronizing signal generating circuit (not shown) that generates a vertical synchronizing signal, a vertical synchronizing signal, a color subcarrier signal, and the like based on an oscillation signal from a crystal oscillator is input to an input terminal ( 13) to the microcomputer (3), and based on the vertical synchronizing signal Sv, the microcomputer (3) forms various signals to be described later. The frequency of the vertical synchronization signal Sv is 52
The frequency is 60 Hz for the 5/60 television system and 50 Hz for the 625/50 television system.

(14) is a view finder equipped with a CRT (15), and a video signal from a video signal processing circuit (7) is used for the CRT (15).
Supplied to (15).

Next, the configuration of the lens device (2) will be described. (16) is an imaging lens, for example, a zoom lens, which is composed of a plurality of lenses (18), and some of the lenses are moved in the axial direction by a driving means (19), whereby focus adjustment, The zoom adjustment and the like are performed. The imaging lens (16) is provided with a stop (17), and the diameter of the stop is also controlled by the driving means (19). The driving means (19) is composed of a plurality of motors and the like, and the driving means (19) is controlled by the microcomputer (4).

Optical data such as the focal length and aperture ratio of the imaging lens (16) are detected by a detecting means (20) comprising a plurality of detecting elements, and the detection signal is transmitted through a microcomputer (4) to a memory (22). And stored.

(21) is an automatic control device for automatic focus adjustment and the like, which receives a detection signal such as a focus state detection signal of the imaging lens (16) from the detection means (20) and, based on this, drives the drive means (19) Is controlled so that focus adjustment and the like of the imaging lens (16) can be performed only on the lens device (2) side by the user's selection.

Next, the electrical connection between the camera device body (1) and the lens device (2) will be described. As shown in FIGS. 2 and 3, the camera device body (1) and the lens device (2) are respectively provided with six contact surfaces (23) and (24) provided in contact with each other. The contacts (25) and (26) are electrically connected.

The six sets of contacts (25) and (26) are electrically connected to each other to transmit a packet from the control signal transmitting terminal of the microcomputer (3) on the camera side to the control signal receiving terminal of the microcomputer (4) on the lens side. A serial control signal CTL of the communication system is transmitted, and a chip select signal CS is transmitted from a chip select signal transmitting terminal of the microcomputer (3) on the camera side to a chip select signal receiving terminal of the microcomputer (4) on the lens side. A system clock signal SCK is transmitted from a system clock signal transmission terminal of the camera microcomputer (3) to a system clock signal reception terminal of the lens microcomputer (4), and the status of the lens microcomputer (4) is transmitted. From the signal transmission terminal, the microcomputer on the camera side (3) The status signal receiving terminal, a serial status signal LTC of packet communication system
Is transmitted, and the power supply (1) of the camera device body (1) is transmitted.
0) positive and negative currents + I, -I from the power supply voltage output terminal
Is supplied to a power supply voltage input terminal of the lens device (2). From the camera device body (1), the lens device (2)
Power supply voltage supplied to the microcomputer (4)
The connection state is supplied to each circuit not shown.

Next, the control signal CTL, status signal LTC signal, chip select signal CS, and system clock SCK transmitted between the microcomputer (3) on the camera side and the microcomputer (4) on the lens side will be described with reference to FIG. Will be explained.

The chip select signal CS, as shown in FIG.
It is generated in synchronization with the vertical synchronization signal Sv shown in FIG. A, has a constant phase with respect to the vertical synchronization signal Sv, rises and falls within one field period, and has a high level in a predetermined period shorter than one field period. This signal is a low level signal before and after (the chip select signal CS may be switched between a high level and a low level depending on the signal format). FIG. 4C shows this chip select signal CS.
Is enlarged in the time direction.

Then, during the high level period of the chip select signal CS, the control signal CTL and the status signal LTC are transmitted one packet at a time in synchronization with the vertical synchronization signal Sv, as shown in FIGS. The bit signals b0, b1,..., B7 of the word signals constituting the control signal CTL and the status signal LTC are
It is formed so as to be synchronized with the system clock signal SCK.

Based on the detection output of the current detection means (1), the microcomputer (3) on the camera side electrically connects the camera device body (1) and the lens device (2) attached thereto. If it is determined that there is no electrical connection, as described above, the electric connection failure is displayed on the screen of the CRT (15) of the viewfinder (14), and the microcomputer (3) on the camera side and the lens side The control signal CTL and the status signal LTC are not transmitted / received to / from the microcomputer (4). A control signal CTL and a status signal LTC are exchanged between the microcomputer 3 on the camera side and the microcomputer 4 on the lens side.
When the microcomputer (3) on the camera side determines that the camera device main body (1) and the lens device (2) attached thereto are not electrically connected even when transmission / reception of is performed. In the same manner, the display of the electrical connection is not displayed on the screen of the CRT (15) of the viewfinder (14), and the microcomputer (3) on the camera side and the microcomputer (4) on the lens side are displayed. The transmission and reception of the control signal CTL and the status signal LTC are immediately stopped.

〔The invention's effect〕

According to the present invention described above, in a video camera device including a camera device main body including an imaging unit that obtains a video signal and a lens device mounted on the camera device main body, the camera device main body and the lens device mounted thereon In addition to being able to easily detect the electrical connection state of the camera, it is possible to reliably recognize that the electrical connection is impossible from the screen of the viewfinder, and automatically perform communication between the microcomputers of the camera device body and the lens device. Can be stopped temporarily.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a mounting surface of a camera device body of the embodiment, FIG. 3 is a diagram showing a mounting surface of a lens device of the embodiment, FIG. 4 shows a waveform diagram of signals transmitted and received between the microcomputers of the camera device main body and the lens device. (1) is a camera device main body, (2) is a lens device, (3)
Is a microcomputer on the camera side, (4) is a microcomputer on the lens side, (5) is imaging means, (11) is current detection means, and (25) and (26) are contacts.

Claims (1)

(57) [Claims] 1. A video camera device comprising: a camera device main body including an image pickup means for obtaining a video signal, a viewfinder to which a video signal from the image pickup device is supplied, and a lens device mounted on the camera device main body. The camera device main body and the lens device each include a microcomputer capable of communicating with each other. The camera device main body includes a transmission and reception terminal of the microcomputer, a power supply, and a power supply voltage output terminal. Comprises a reception and transmission terminal of the microcomputer and a power supply voltage input terminal, when the lens device is mounted on the camera device body, between the transmission terminal of the camera device body and the reception terminal of the lens device, Between the receiving terminal of the camera device body and the transmitting terminal of the lens device, Connecting means for electrically connecting a power supply voltage output terminal of the device main body and a power supply voltage input terminal of the lens device, respectively; and a power supply current provided between the power supply and the power supply voltage output terminal provided on the camera device main body. Current detection means for detecting whether or not the current is flowing, wherein a current detection signal from the current detection means is supplied to a microcomputer on the camera device main body side, and the current detection means When it is detected that the power supply current does not substantially flow between the power supply and the power supply voltage output terminal, an electrical connection disable signal is generated from the microcomputer, and the viewfinder indicates that the electrical connection is not possible. And communication between the microcomputers of the camera device main body and the lens device is stopped. Video camera and wherein the door.