JPS63141030A - Information output device for interchangeable lens with correction information on intermediate accessory - Google Patents

Abstract

PURPOSE:To perform exposure control, automatic focus adjustment, and display operation normally even when an intermediate accessory is interposed between an interchangeable lens and a camera body by providing a fixed storage circuit where interchangeable lens characteristic information and various kinds of information corrected according to characteristics of plural kinds of intermediate accessories are stored fixedly. CONSTITUTION:The address space of a ROMRO is divided into four areas and the interchangeable lens characteristic information and various kinds of information corrected by the characteristics of three kinds of intermediate accessories are stored. Information obtained by correcting information on an interchangeable single body by the characteristics of a 1.4 times rear converter is stored in an address area of '00H'-'1FH' (H denotes, hexagonal) when the 1.4 times rear converter is interposed between the interchangeable lens and a camera body. Information corrected by the characteristics of a 2 times rear converter is information in an address area of '5FH', information corrected by the characteristics of an extension ring is stored in an address area of '80H'-'9FH', and information when no extension accessory is interposed is stored in an address area of 'C0H'-'DFH'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a camera that is equipped with an intermediate accessory, such as a rear converter, an intermediate ring, and a bellows, which are interposed between an interchangeable lens and a camera body. The present invention relates to an output device for outputting a lens information signal to a camera body.

(Prior art) Various unique information of interchangeable lenses, such as open aperture, focal length, and conversion coefficients for matching the focus shift amount for automatic focus adjustment with the driving amount of the focusing lens, are exchanged. Information output devices in which information is electrically transmitted from a lens to a camera body are already known. Conventionally, this type of device has been limited to cases in which the interchangeable lens is attached directly to the camera body, and intermediate accessories such as a rear converter, intermediate ring, and bellows are interposed between the interchangeable lens and the camera body. No countermeasures had been considered for the case where it was used in Generally, when an intermediate accessory such as a rear converter is inserted between the interchangeable lens and the camera body, the maximum aperture and focal length will be the combined FR value of the interchangeable lens and the intermediate accessory. There was a problem that exposure control, automatic focus adjustment, and display did not function properly with only lens-specific information.

As a device to solve this problem, JP-A-58-1886
What is shown in Publication No. 22 has been proposed. This device includes a calculation circuit that performs correction calculations according to the characteristics of the intermediate accessory itself on the unique information received from the interchangeable lens on the negative side of the intermediate accessory, and outputs the calculated information to the camera body. It is an intermediate accessory with an output circuit. However, this device requires an IC equipped with a correction calculation circuit based on characteristics for each intermediate accessory, resulting in high cost. However, since rear converters and the like are generally used as auxiliary tools, they are required to be cheaper than consumers, and cost remains a problem.

(Objective) An object of the present invention is to provide an information output device for an interchangeable lens that allows exposure control, automatic focus adjustment, and display to function normally even when an intermediate accessory is interposed between the interchangeable lens and the camera body. shall be.

(Means for Solving the Problems) The present invention is used in a camera system in which various types of information about an interchangeable lens are electrically transmitted from the interchangeable lens to the camera body, and information specific to the interchangeable lens and between the interchangeable lens and the camera body are used. a fixed memory circuit that fixedly stores various information corrected according to the characteristics of a plurality of types of intermediate accessories interposed between the intermediate accessories; and a detection means that detects the type of the intermediate accessories;
The address of the fixed memory circuit is specified according to the detected type, and only information corresponding to the characteristics of the intermediate accessory inserted between the interchangeable lens and the camera body is selectively stored.
It is configured to read data from the fixed storage circuit and output it to the camera body.

(Example) The present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram showing an information output device for an interchangeable lens equipped with intermediate accessory correction information to which the present invention is applied. The left side of the constant chain line is the camera body (X), and the center is the intermediate accessory (Y). , the circuit on the right side is the interchangeable lens (Z) side.

The terminal (Bo) on the camera body side is a power output terminal, and is connected to the power input terminal (Pa) on the interchangeable lens side via the intermediate accessory terminal (ACo).

The terminal (B1) on the camera body side is the intermediate accessory terminal (A
ct) is connected to the reset terminal (RE) of the counter (CO+) p (CO2) via the input terminal CP, ) on the interchangeable lens side and the inverter (!N).

This input terminal (Pl) remains "High" while receiving information from the interchangeable lens, and the counter (GO+
) y (COz ) is set to the reset elimination state.

The output terminal (B2) on the camera body side sends clock pulses from the camera body to the interchangeable lens side to synchronize the electrical operation between the interchangeable lens and the camera body.
It is connected to the terminal (CL) of the counter (Co, ) via the terminal (ACz) of the interchangeable lens and the input terminal (B2) of the interchangeable lens.

The counter (Go, ") * (Go□) is a 3-bit pinary count, and the counter (Co,) counts the rising edge of the clock pulse from the input terminal (B2), and counts the rising edge of the 8 clock pulses. The carry-1 terminal (CY) is set to "High" from the time until the rising of the next clock pulse.The counter (CO□) counts the falling edge of this carry-1 terminal (C'Y), and the 8th At each rising edge of the first clock pulse, the count value of the counter (CO□) increases by one.

3-bit output (E2 to Eo) of the counter (COZ)
is input to the decoder (DE2), and this decoder (D
Ez), Table 1 according to the contents of the counter (CO2)
(Outputs t1.

(Hereinafter referred to as gold and white) Table 1 The output terminal (Ss) of the decoder (DEz) is connected to the select terminal <SC> of the data selector (DS), and the data selector (05) Data from input terminal (A,) to output terminal (SA)
and when it is “H”Hgh*#, input terminal (A2)
The data from the ROM (RO) is output to the output terminal (SA) as address data of the ROM (RO).

Input terminal (P5) on the interchangeable lens (Z) side? (Pa)
is the terminal (ACs) of the intermediate accessory (Y) * (
The information indicating the type of intermediate accessory set to ACd) is detected, and the data selector (DS) input terminal (A
1), the next three bits are connected to ground, and the lower three bits are directly read by the output terminals (52 to So) of the decoder (DE2). Therefore, R.O.
The address of M (RO) is the output of the counter (Co2).
Between “000” and “100” (7) is “##00000”
0” to “##000100” are specified next.

In 2S, # is the type information terminal (A) set on the intermediate accessory (Y) inserted between the interchangeable lens and the camera body.
Cs ), (ACd ) as shown in Table 2. Information indicating the type of intermediate accessory is connected to the upper 2 bits of the input terminal (A2) as well as the input terminal (A,), and the next 3 bits are connected to the decoder (DE2).
tM* is sent to the output terminals (52 to So) of the zoom lens, and the lower three bits are inputted as data from the encoder (ENC) linked to the focal length variable magnification member (not shown) of the variable magnification lens.

Therefore, the address of ROM (RO) is the counter (Co2
) (7) When the output is between '101' and '111°', the output is '#'.
#0011 *” to “##011****” (1) Addresses are specified sequentially. At knee, * indicates that the focal length is determined by the focal length changing operation.

Table 2 Next, the memory map of the ROM (RO) that stores interchangeable lens information corresponding to intermediate accessory characteristics is shown in Table 3-right and will be described.

(The following is a blank space) The address space of the ROM (RO) is divided into four areas to store information unique to the interchangeable lens and various information corrected based on the characteristics of the three unique intermediate accessories. OOH
When a 1.4x rear converter is inserted between the interchangeable lens and the camera body, the address area from ``'' to IFH (H indicates a hexadecimal number) contains information about the single interchangeable lens. Information corrected based on the characteristics of the double rear converter is stored. The address area from “40H” to “5FH” contains information corrected based on the characteristics of the double rear converter, and the address area from “80H” to “9FH” contains information corrected based on the viscosity of the intermediate ring, COH'”～” DFH
The address area ``'' stores information when no intermediate accessory is inserted, that is, the unique information of the interchangeable lens alone. The information contents of the interchangeable lens alone are shown and explained in Table 3-left.

The “COH” address contains an information identification code “OIH” that identifies the quantity and content of unique information output from this lens.
, and if the lens has a large amount of information, the information identification code ゛0
2H” is stored.

The camera body reads this identification code and selects the subsequent information reading method.

The address of "'CIH" has a function code of 441 It if the automatic diaphragm mechanism is built in, and the next bit if the linking mechanism for driving the focusing lens from the camera body is built in. The bit is set to "1", and if the direction in which the focusing lens is extended is counterclockwise, the most significant bit is set to "°1".

The open aperture value is stored at the address "C2H". In addition, in the case of a lens whose maximum aperture value changes with a magnification change operation, the maximum aperture value at the maximum aperture value is stored. “C3H
The minimum aperture limit is stored in the address ``.
In the case of a lens whose minimum aperture value changes with zooming operations, the most open aperture value is stored.

At the address "C4H", a wide open photometry error correction value for correcting errors included in wide open photometry is stored.

Addresses "C8H" to "'CFH" determine the amount of aperture change from the effective aperture at the shortest focal length when the focal length of the zoom lens is changed from the shortest focal length by the focal length changing operation. stored in the address.

At addresses "'D OH'" to "'07H", focal lengths are stored at addresses determined by the coarse focal length variable magnification device. The addresses "08H" to "'DFH" are used to drive the focusing lens toward the expected focal position based on the shift amount of the imaging position of the object to be focused detected by the camera body relative to the expected focal position. A conversion coefficient for making the amounts correspond is stored at an address determined by the focal length changing operation.

Intermediate accessories for the above single interchangeable lens information
Information corrected based on the characteristics of is stored in the other three address areas. For example, the information content when a 2x converter is installed is that an automatic aperture linkage mechanism and a focusing-like lens drive shaft linkage mechanism are built into intermediate accessories so that all functions of the interchangeable lens can be used. Therefore, the information identification code and function code are the same as the interchangeable lens unit information. The maximum aperture value and the minimum aperture value tVt may be doubled depending on the characteristics of the 2x rear converter. For example, if the maximum aperture value of the interchangeable lens is F:1.4, Fl, 4X2 = F2.8, and the minimum aperture value is F. :16, information corresponding to F16X2=F32 is stored. In the wide open photometry error correction, since the position of the entrance pupil moves forward when a 2x converter is attached to the interchangeable lens, the photometry error can be ignored, so the correction amount is set to 0.

The amount of change in actual aperture is information based on the characteristics of the interchangeable lens, so it is made the same as the information on the interchangeable lens alone. The focal length may be doubled depending on the characteristics of the 2x converter. For example, if the focal length of the interchangeable lens is f=35mm, 50mm, or 70mm.
Then f = 70mms 100 as the focal length doubled
Information corresponding to mm and 140 mm is stored. Due to the characteristics of the 2x converter, the defocus conversion coefficient is stored as information corresponding to 1/4 times the information on the single interchangeable lens.

The explanation will be given by returning to FIG. 1 again.

The 3-bit output (Cz~Co) of the counter (GO+)
) is input to the decoder (DEN), and this decoder (
DE, ) outputs the signals shown in Table 4 according to the contents of the counter (Go, ).

Table 4 The output terminal (Do"Dy) of the decoder (DEN) is connected to one input terminal of the anime game) (ANo to AN7), and the other is connected to the output terminal (O) of the ROM (RO).

~02), and the AND gate (ANo~AN,)
The output is output as a signal to the camera body side (X) via the OR gate (OR), the terminal (P3), and the intermediate accessory terminals (AC3) and (B3).

When the counter advances by one at the rising edge of the clock pulse, the output terminal (Do) of the decoder (DEI) goes high.
h'', the gate of the AND gate (ANo) is opened, and the signal at the output terminal (Oo) of the ROM (RO) is outputted via the OR gate (OR).

In this way, every time the clock pulse rises, the ROM
The signals at the output terminals (Oo to 07) of (RO) are passed through an AND gate (A No
NA N y ), OR gate (OR), terminal (P3
), (ACx), and (B3) to the camera body side (X)
A signal is output to.

In the above description, a case has been described in which an intermediate accessory is interposed between the interchangeable lens and the camera body.Next, a case in which the interchangeable lens is directly attached to the camera body will be explained.

The input terminals (P5) and (P6) of the interchangeable lens (Z) are terminals that detect the type of intermediate accessory, but since the body (X) does not have a terminal connected to these terminals, the input terminals (P5) and (P6) are terminals that detect the type of intermediate accessory. Both terminals (Ps) and (Pn) are open, and the input terminals (A, ) and (A) of the data selector (DS)
The upper 2 bits of 2) are designated as "11'°. Therefore, the ROM (RO) address designation is from "'COH" to "DF.
This becomes the address area of "H", and information on the single interchangeable lens is output as a signal to the camera body (X).

In addition, even when an intermediate accessory, which is a conventional technique, is installed between the interchangeable lens (z) and the camera body (X), the intermediate accessory equipped with a correction@arithmetic circuit corresponding to the characteristics on the side of the intermediate accessory, the interchangeable lens (Z) input terminals (P5), (P6
) is not provided in the prior art product, information on the single interchangeable lens is output from the interchangeable lens side (Z) to the intermediate accessory side. Therefore, even if special intermediate accessories that are not included in the prior art product or the ROM (RO) on the interchangeable lens side (Z) are constructed using the prior art, compatibility on the interchangeable lens side is ensured.

In this section, intermediate accessories used in interchangeable lenses equipped with intermediate accessory correction will be explained.

The intermediate accessory (Y) has a terminal (ACs) as a type information setting section to indicate one type of its own accessory.
(AC6) is provided on the mount surface on the side of the interchangeable lens, and each terminal is connected to ground or left open and information on one type of accessory is fixedly set. However, when setting both terminals to be open, the address area of the ROM (RO) is specified in the same way as when the interchangeable lens (Z) is attached directly to the camera body (X), so information about the interchangeable lens alone is output. be done. In this embodiment, a terminal (AC
s), (AC6) and the input terminal on the interchangeable lens side (P5)
, (P6), the number of these electrical contacts can be increased or decreased as appropriate depending on the type of intermediate accessory.

In addition, the intermediate accessory (Y) can directly transmit the signal output from the information output device of the interchangeable lens to the camera body (X).
Terminals and conductive wires are provided to transmit the power, ground, and control signals supplied from the camera body (X) to the interchangeable lens (Z). Signals are transmitted in the same way as when it is attached directly to the camera body (X).

In the above, an example of a fixed magnification rear converter such as a 1.4x rear converter or a 2x rear converter was explained as an intermediate accessory.Next, we will explain the case of a variable magnification rear converter using the block diagram in Figure 2. do.

Power, ground, control signals and information input output from the side control circuit (2) including the CPU of the camera body (1) are connected to terminals (T, ~Ts) provided on the mount surface, and the rear controller with variable magnification The terminals (Ta to T10) installed on the camera body side mount surface of Bark (3) and the terminals (T1) installed on the interchangeable lens side mount surface connected by conductive wires.
1 to T15) and to an interchangeable lens information output circuit (7) via terminals (T19 to T23) provided on the mount surface of the interchangeable lens (6). Then, the exchange intermediate accessory type information is connected to the interchangeable lens information output circuit (7) via the terminals (T16 to T18) and the terminals (T24 to T26) provided on the interchangeable lens side mount surface, and the one accessory type information is connected to the interchangeable lens information output circuit (7). Interchangeable lens information in the designated address area is transmitted to the camera body. The explanation up to this point is the same as that of a fixed magnification converter, but in the case of a variable magnification rear converter, the optical characteristics change from, for example, 1.4 times to 3 times by changing the magnification operation. Interchangeable lens information corresponding to the amount of change must be transmitted to the camera body.

Therefore, in order to correspond to the amount of change in optical characteristics due to the variable magnification operation, a 3-bit encoder (4), for example, is provided in the variable magnification rear converter (3), and the rotating member (5) and the encoder pattern linked to the variable magnification operation are provided. Depending on the position of contact with the
T26) may be input to the interchangeable lens information output circuit (7), and the interchangeable lens information of the address area designated by the characteristic information of the set magnification may be transmitted to the camera body.

Next, a case will be described with reference to FIG. 3 in which the optical system is removable from the lens barrel in a double converter which is an intermediate accessory.

In FIG. 3, parts that perform the same functions as those in FIG. 2 are given the same numbers and their explanations will be omitted.

In the converter gaIf4, the optical system inside the lens barrel is removably installed, and when the optical system is attached, it exhibits the characteristics as a double rear converter, and when the optical system is detached, the characteristics change as an intermediate ring. Corresponding interchangeable lens information must be transmitted to the camera body. Therefore, a switch (S S
) is installed in the lens barrel, and when the optical system is attached to the lens barrel, the detection switch (SS) is closed, and the terminals (T16-T17) and (T
24-T26) Information indicating 2x convergence is output as accessory characteristic information via the interchangeable lens information output circuit (
7).

Also, when the optical system is detached from the lens barrel, the detection switch CSS
> is opened, information indicating the intermediate ring is input to the exchange lens information output circuit (7), and the exchange lens information of the address area specified by the characteristic information of the detection switch (SS) is transmitted to the camera body. It may be configured as follows.

In the above-described embodiments, the circuit section of the present invention was composed of individual circuit elements, but the entire circuit section could be composed of a microprocessor such as a one-chip microcomputer to sequentially control the information output device of the present invention. Good too.

(Effects of the Invention) The present invention provides a fixed memory circuit that fixedly stores information unique to an interchangeable lens and various information corrected based on the characteristics of several types of intermediate accessories inserted between the interchangeable lens and the camera body. Then, the address of the fixed memory circuit is specified according to the type of intermediate accessory, and only information corresponding to the characteristics of the intermediate accessory inserted between the interchangeable lens and the camera body is selectively stored in the fixed memory circuit. Since the interchangeable lens side is equipped with an information output device configured to read information from the circuit and output it to the camera body, exposure control, automatic focus adjustment, and display of the camera body can function normally.

The intermediate accessory used for the interchangeable lens equipped with the correction information of the present invention is set with one type of accessory information detected by the information output circuit on the interchangeable lens side, and is output from the interchangeable lens (the J number is transmitted directly to the camera body. Therefore, an IC equipped with a correction calculation circuit and an information output circuit on the intermediate accessory side is not required, and the structure is simple and effective in reducing costs.

Furthermore, even if an intermediate accessory, which is a conventional intermediate accessory equipped with a correction calculation circuit corresponding to the characteristics, is inserted between the interchangeable lens equipped with the information output device of the present invention and the camera body, it will work normally. It is possible to output information, and compatibility with conventional technology products is also ensured.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an information output device for an interchangeable lens equipped with intermediate accessory correction information to which the present invention is applied;
FIGS. 2 and 3 are block diagrams showing a rear converter with variable magnification and a rear converter with a detachable optical system. co, , co□・・・・・・・・・Counter, DEL, DE2・・・・・・・・・Decoder, DS・・・・・・・・・・・・Data Selekku,
RO... Old... ROM, ENC... Old... Encoder, SS... Switch, l... Old, group, camera body. , 2...
...Control circuit, 3...Rear converter, 4...Encoder, 5.
・Gun... Old... Sliding members, 6...
Interchangeable lens, 7... Interchangeable lens information output circuit.

Claims (1)

[Claims] In a camera system in which various types of unique information about an interchangeable lens are electrically transmitted from the interchangeable lens to the camera body, characteristics of the unique information of the interchangeable lens and multiple types of intermediate accessories interposed between the interchangeable lens and the camera body a fixed memory circuit that fixedly stores various information corrected by the above at each address; a detection means that detects the type of intermediate accessory; and a detection means that specifies the address of the information in the fixed memory circuit according to the detected type. an addressing circuit;
and an output means for outputting information stored at the address of the fixed storage circuit designated by the address designation circuit to the camera body. Information output of an interchangeable lens with correction information for an intermediate accessory. Device.