JPH0782184B2 - Camera system - Google Patents

Description

The present invention relates to a camera system, and more particularly to a camera system using an interchangeable zoom lens.

<Prior art> With a zoom lens, it opens depending on the zoom state.
There is a change in FNo, etc., and when using this variable open FNo zoom lens mounted on the camera, it is necessary to notify the camera of the open FNo according to the zoom state. In recent years, as a method of transmitting this open FNo to the camera, a ROM is provided inside the lens, and each open FNo information determined according to the zoom state is stored in this ROM, and the open FNo information according to the zoom state is stored in the camera. It has been proposed that the control aperture data be obtained by performing arithmetic processing in the camera based on the open FNo information.

According to this method, it is possible to deal with the change of the open FNo, but it is necessary to perform all the calculation processing by a calculation circuit such as a computer in the camera, which makes the calculation processing complicated.

Also, if the above method is applied to a system in which a diaphragm driving device is installed in the lens barrel to control the diaphragm, the open diaphragm data is sent from the lens side to the camera once, and the processed data is processed again in the camera. Has to be returned to the lens side to drive the lens diaphragm based on the processed data, and there is a drawback that data communication between the camera and the lens becomes complicated.

<Purpose> The present invention has been made in view of the above matters, and as its configuration, a camera main body having a main computer that outputs data processing and commands from an output port, an optical unit (zoom optical system, etc.), and an optical unit of the optical unit. A memory circuit for storing a plurality of different fixed data according to the setting state, an operating member for adjusting the shooting state, and a drive circuit for driving the operating member are provided, and the setting state of the optical means is repeatedly detected to detect the setting state. Detection processing means for reading the data of the memory circuit based on the detection result and storing the read data in the store portion; and stored in the store portion in response to a predetermined command communicated from the main computer. Processing means for calculating the stored data and the data communicated from the main computer, and the processing means. A sub computer having a control processing means for controlling the drive of the operating member by the drive circuit based on a logical result is built-in, and is detachable from the camera body, and is connected to the main computer in a mounted state with the camera body. A camera system is composed of the lens barrel that performs data communication with the sub computer, and the setting state of the zoom optical system etc. is constantly monitored inside the lens barrel, and the data corresponding to the set state of the optical system is stored in the memory. It is read out from the circuit and stored in the sub computer inside the lens barrel, and when a command is input from the camera to the lens barrel, the sub computer immediately executes the arithmetic processing with the above store data. By controlling the aperture in the lens based on the calculation result, the above problem is solved and further processing is performed. It is intended to measure the reduction as well as improvement in the continuous shooting of the time.

<Embodiment> FIG. 1 is a block diagram showing an embodiment of a camera system according to the present invention.

In the figure, reference numeral 100 denotes a camera body, which includes a photometry circuit C6, a distance measurement circuit C7, a main microcomputer C ₁ (hereinafter referred to as a main microcomputer), a ROMC ₃ , a lens barrel and a strobe device described later. An interface C ₂ , a power supply C _4, and a disk drive C ₅ for data communication are provided. Reference numeral 200 denotes an interchangeable zoom lens barrel that is mounted on the camera body.
Lens side interface L ₂ that sends and receives data via C ₂ and terminals C 21 to 24, L 21 to L 24, sub-microcomputer L ₁ (hereinafter referred to as sub-microcomputer), ROML ₃ , focus drive system L ₅ , zoom It has a drive system L ₅ and a diaphragm drive system L ₄ . Reference numeral 300 denotes a strobe device mounted on the accessory shoe part of the camera body, and the strobe-side interface for transmitting / receiving data to / from the camera body is provided in the strobe device.
S _2, sub-microcomputer S _1, ROMS _3, are provided flash emitter S _4.

FIG. 2 is a detailed block diagram showing the internal structure of the lens barrel 200.

In FIG. 2, ZD is a zoom code plate provided on the lens barrel, DET ₁ is moved on the code plate in conjunction with the zoom operation ring of the lens barrel, and on the zoom code plate according to the set zoom state. Is a detection member that comes into contact with the pattern. The detection member transmits the detection signal (zoom signal) to the sub-microcomputer L ₁ . AD ₁ is an aperture driver that drives the aperture AP ₁ by a command from the microcomputer L ₁ , and the driver has a built-in step motor and drives the aperture AP ₁ by the step motor.
The diaphragm AP ₁ and diaphragm driver AD ₁ are the diaphragm drive system L ₄
Make up.

FIG. 3 is an explanation showing the relationship between the open aperture information AV ₀ stored in the ROML ₃ and the zoom state and the output (zoom signal) of the code plate ZD detected by the detection member DET ₁ according to the zoom state. It is a figure.

Figure 4 (a), (b) is a program flow for explaining the operation of the sub-microcomputer L _1, the sub-microcomputer L ₁ operates according to the program flow.

Next, the operation of the present invention will be described using the above flow.

First, when the sub-microcomputer L ₁ is activated, the step is # 1.
Move to. Each step will be described below in order. Step #
1: Reset the interface ICL _{2 in the} lens and initialize the aperture.

This initialization of the diaphragm is performed by sending a return signal from the sub-microcomputer L ₁ to the diaphragm driver and supplying a pulse for moving the diaphragm to the initial position to the step motor that drives the diaphragm by the driver.

Step # 2: Detecting member detecting the zoom code plate ZC
Input the zoom code signal detected by DET ₁ .

Step # 3: The previously read zoom code signal is compared with the zoom code signal read in Step # 2, and if both zoom code signals match, the step #
If it does not coincide with step 5, the process proceeds to step # 4.

Step # 4: Store the zoom data. The zoom data is, for example, open aperture value AV _O information that changes depending on the zoom state of the lens, and the zoom state in the present embodiment, that is, the relationship between the zoom code signal and the AV _O information is set as shown in FIG. Stored in a predetermined address in ROML ₃ .

In step # 4, the address of ROML ₃ corresponding to the detected zoom code signal is designated, and AV _O information corresponding to the zoom code signal is input to the sub-microcomputer L ₁ .

Step # 5: Wait for a command from the camera (wait for command). When no command is sent from the camera, the process proceeds to step # 2 again, and when no command is sent from the camera thereafter, step # 2 → # 3 → # 5 or # 2 → # 3.
→ Repeat # 4 → # 5.

Therefore, the zoom state of the lens is always detected, and the AV _O information according to the latest zoom state is fetched.

The step # 2 to # terminal L ₂₁ of 5 the repeated Kaee camera operation member is operated in to process commands from INTERFACE C ₂ cameras via a terminal C ₂₁ -C ₂₄ lens INTERFACE L ₂ ~L It is assumed that the command is input to ₂₄ and this command is read by the sub-microcomputer L ₁ . In this case, it is determined in step # 5 that a command has been input from the camera, and the process proceeds to step # 6.

Step # 6: Move the step to the command interpreter.

In this embodiment, the command interpreter is after step # 7, and in step # 6, the step shifts to # 7.

Step # 7: The content of the command whose input is detected in Step # 5 is judged.

In this determination, it is determined whether or not the input command is preset in the camera system and an existing command is present. If the input command is an existing command, the process proceeds to step # 9, and if the command does not exist, the process proceeds to step # 8.

Step # 8: Send a command error indicating that the input command was inappropriate to the camera side, and inform the camera of this.

Step # 9: Send a return command to the camera to inform the camera that the input command is accepted.

If the input command is confirmed in the above steps # 7, # 8 and # 9 and the input command is not appropriate, the above error is notified to the camera side, and then the process proceeds to step # 2 again.

Therefore, if the command sent from the camera to the lens is not the correct command (preset command), the command is ignored and the process returns to step # 2. If the command is correct, the process proceeds to step # 10.

Step # 10: shift to the command routine according to the input command.

In step # 10, the process in the command routine designated by shifting to the routine corresponding to the input command is executed.

FIG. 4B is a program flow showing an aperture control command routine. When the command is aperture control, the routine is executed following step # 10. The routine will be described below on the assumption that the aperture control command is designated. Step # 11: Jump from the command interpreter and move to step # 11.

Step # 12: Receive operand data from the camera. Since the operand data in this case is the aperture control routine, it corresponds to the control aperture value AV.

The control aperture value AV is a value based on the photometric output obtained by a known calculation in the camera or manually set in the camera.

Step # 13: Send an operand reception end signal to the camera.

Step # 14: The input operand data AV is compared with the input aperture data AV ₀ corresponding to the zoom state by inputting at step # 4, and the process proceeds to AV <AV ₀ step # 16.

Step # 15: AV = AV _{0 is set,} and the value of the operand data AV from the camera is set to AV ₀ according to the zoom information. That is, when the operand data AV is smaller than AV _{0 of the} lens, there is no value on the open side of the open aperture, so AV ₀ is used as control aperture data.

Step # 16: The maximum small aperture value AVmax of the zoom data stored in Step # 4 according to the zoom state.
Is compared with the operand data AV from the above camera and AV
When> AVmax, the process proceeds to step # 17, and when AV <AVmax, the process proceeds to step # 18.

Step # 17: AV = AVmax is set, and the operand data AV value from the camera is set to AVmax. That is, when the operand data AV is larger than the AVmax of the lens, there is no smaller diaphragm side than the maximum small diaphragm value, so AVmax is used as the control diaphragm data.

The data AVmax is also stored at a predetermined address in the ROML ₃ like the AV _0, and is stored in step # 2 in accordance with the zoom signal.

In steps # 14 to 17 above, the operand data AV from the camera is evaluated, and AV ₀ <AV <AVmax or A in relation to the data AV ₀ and AVmax that vary according to the zoom state.
It is determined whether V <AV ₀ or AVmax <AV, and when AV <AV ₀ , AV
= AV ₀ , AVmax <AV, AV = AVmax.

Step # 18: AV-AV ₀ is performed on the operand data AV from the camera to obtain the number of control aperture steps, and at the same time, the AV determined and processed in the above step is sent to the camera.

Step # 19: Information corresponding to AV-AV ₀ above is the sub-microcomputer.
It is sent from L ₁ to the diaphragm driver, and the stepper motor is driven by the driver by the number of steps corresponding to the AV-AV ₀ information. As a result, the aperture linked to the step motor is controlled to the AV value specified based on the operand data from the camera.

Step # 20: Send a routine execution end signal to the camera.

Step # 21: The above command routine is terminated and the process proceeds to Step # 5, where the camera waits for a new command.

Although the number of apertures is controlled in the above embodiment, in the case of absolute value control, the aperture is directly driven based on the AV determined in steps # 14 to # 17.

Further, in the embodiment, the open FNo (AV ₀ ) is used as the variable data, but the same applies to other lens-specific data that changes by manual operation of the lens (for example, correction data for autofocus adjustment). It is obvious that it can be processed. Further, as the ROM, EEPROM or the like can be used.

<Effect> As described above, according to the present invention, the computer in the lens processes the lens-specific data that can be changed manually by operating the lens. Therefore, the calculation process in the camera can be simplified. The processing time between the camera and the lens can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the camera system according to the present invention, FIG. 2 is a block diagram showing the internal construction of the lens barrel shown in FIG. 1, and FIG. 3 is a relation between code plate output and AV ₀ . And FIGS. 4 (a) and 4 (b) are explanatory views showing the program flow of the present invention. L ₁ …… Sub-microcomputer L ₂ …… Lens side interface circuit L ₃ …… ROM L ₄ …… Aperture drive system

Claims (1)

[Claims] 1. A camera body having a main computer for outputting data processing and commands from an output port, an optical means and a memory circuit for storing a plurality of different fixed data according to a setting state of the optical means, and an image pickup state are adjusted. And a driving circuit for driving the operating member, the setting state of the optical means is repeatedly detected, the data of the memory circuit is read out based on the detection result, and the read data is obtained. Detection processing means for storing the data in the storage portion, and operation processing means for performing an operation on the data stored in the storage portion and the data communicated from the main computer in response to a predetermined command transmitted from the main computer. Control processing means for performing drive control of the operating member by the drive circuit based on the calculation processing result With a built-in sub-computer comprises a camera system composed of said a detachable from the camera body, a lens barrel for performing data communication with the main computer and the auxiliary computer in the mounted state of the camera body.