JPS62187830A - Lens information arithmetic unit - Google Patents

Abstract

PURPOSE:To secure proper exposure by calculating effective converging value information determined by both a master and a conversion lens from information which is characteristic to the master lens or variable and information corresponding to the power varying operation of the conversion lens. CONSTITUTION:The master lens ML encodes a signal DELTAZ corresponding to zooming operation into a 4-bit signal by a zoom encoder 1 and outputs the signal. An address assigning circuit 3 selects signals from the encoder 1 and a decoder 2 to specify an address of a ROM 4. The ROM 4 is stored previously with information on the master lens ML at every address and when an address is specified by the address assigning circuit 3, the information in the address is outputted. The conversion lens CL uses a converter capable of varying photographic power by the movement of some lens in it. Consequently, the arithmetic circuit 11 calculates the effective converging value information determined through the power varying operation of the master lens and conversion lens.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an interchangeable lens camera system in which a conversion lens is selectively inserted between a master lens and a camera body. The present invention relates to a photographic information calculation device in an interchangeable lens camera system that uses a conversion lens (so-called macro converter) that moves a lens in the camera section and thereby changes the photographing magnification.

2. Description of the Related Art It is well known that the effective aperture value of a photographing optical system changes as the shadow magnification changes (especially in close-up photography). Therefore, in a conversion lens with a constant t141' magnification, a calculation circuit that adds predetermined data corresponding to the shooting magnification to the aperture value data of the master lens and outputs the combined value (effective aperture value) to the camera body is installed in the conversion lens. Japanese Patent Application Laid-open No. 188622/1983 proposes that the structure be provided within the same area.

Starting tg1. , 6 < Blind Ll U - and 1 length. One point, however, is that the above-mentioned conventional device does not compensate for changes in photographic magnification due to focus adjustment of the master lens itself, and is not perfect. In addition, if the conversion lens is a macro converter that can change the magnification by moving a part of the lens, the shooting magnification will change variously depending on the magnification changing operation and the focus adjustment of the master lens.
It was impossible to accurately determine the effective aperture value.

In this way, in a camera system where the effective aperture value changes due to the variable magnification operation of the macro converter, if the effective aperture value remains unknown, it is not only impossible to guarantee proper exposure, but also focus detection based on the light passing through the photographic lens. There were cases where proper focus detection could not be guaranteed with the 1σ 1 path of pre-detection.6 In particular, when shooting at high magnification using a macro converter, the effective aperture value becomes large and it becomes difficult to adjust the focus visually, so the focus detection result For example, it is of great significance to perform automatic focus adjustment based on this, but there is the inconvenience of performing focus adjustment based on an incorrect focus detection result without knowing that the effective aperture value has exceeded the limit aperture value at which focus detection is possible. Easy to occur.

The present invention aims to provide a device that can obtain accurate effective aperture value information in a camera system in which a macro converter is inserted between a master lens and a camera body. The present invention provides means for calculating FF effect aperture value information determined by variable f& operations of both lenses from information specific to or variable in the master lens and information corresponding to variable magnification operations of the macro converter. The information on the master lens includes the lens distance, which changes according to focus adjustment, as well as the open aperture value, setting or control aperture value, etc.

OPERATION: With the above configuration, effective aperture value information can be accurately calculated based on information that changes in response to the magnification adjustment wheel of the macro converter and the focus adjustment of the master lens.

In practice, a method for calculating composite lens information calculated according to the present invention will be explained based on FIG. 22. Figure 22 shows the convergence 1 between the master lens (ML) and the camera body (CB).
I''A''C' schematically shows an optical system in which a lens (CL) is inserted. In the figure, the distance (S) is from the subject (0) to the point (P) in front of the master lens (ML).
The distance (B,) is the distance from the rear principal point (P2') of the conversion lens (CL) to the film (F), and the distance #(d,), (dt> is Master lens (ML) and conversion lens (C) respectively.
L) principal point spacing, distance (el) is the distance from the rear principal point (PI') of the master lens (M) to the convergence lens side mount surface, and distance # (e*) is the distance of the conversion lens (CL).゛?This is the distance from the star lens side mount surface to the front principal point (P,).

Here, l/II# (C1) of the master lens (Ml)
The distance M(d,) changes depending on the 1'-movement operation of the focusing ring (not shown) of the lens, and the distance M(d,) is the focal length of the lens if it is a zoom lens. It changes according to manual operation of the J-node ring (not shown). Also, conversion lens (C
In L), if the imaging magnification of the lens is fixed, the distances (dt), (C2), and (B1) are fixed, but by moving some of the lenses with a manual operation ring (not shown), If the imaging magnification can be changed, the distance u(C2) is <8.
) becomes common. In addition, in the following F, for simplicity, it is assumed that when (B,) increases, (C2) decreases by the same amount.In the example described below, master lens X (ML)
and the combined focal length # (It) of both lenses using the conversion lens (C), the combined shooting magnification (β), and the shooting distance (
D), front and back composite depth of field ([1), (b)
, the effective aperture value (Fe) is calculated from the following formula.

First, the focal length of the master lens is ``, the focal length of the conversion lens is r2, and the tM shadow magnification of the master lens when the conversion lens is attached is β.

Conversion lens shooting f, ``de β7. Allowed g
B random circle diameter is 1/b -■? ■, If the aperture value of the master lens is 1-'□, rt = β2・f1 β −1βI・ β, ID = S 10 dl+e, +e2+d, + B +a
=b=(1+1/β)2-Fco/30Fe=Foo
(1+β) However, β,=(f,-B,)/I.

β+ = 1 <c+ +ep +B +/β,)
/f1s = L(t, -L/β1) F ■ = de, · β 2 The relational expression holds true.

Here, when the focal length of the master lens (ML) and the imaging magnification of the conversion lens (CL) are both fixed, B + +dl +d2+elelfl is constant, so β7. "t is uniquely determined. However,
Since el changes depending on the distance adjustment, β1 changes, and therefore β1. β, D, a, b, Fc change. On the other hand, if the master lens is a zoom lens, β2 is constant, but d,,r, changes according to the focal length adjustment, so rt, β, D, a, b, and Fe all change, and as mentioned above, The calculation becomes more complicated. Furthermore, if the photographing magnification of the convergence lens can be changed, B + +62 changes and β2 also changes, making the calculation even more complicated.

The present invention uses a microcomputer to calculate composite lens information that requires such complex mathematical formulas, and uses information unique to the master lens or i+
1-variable information (dl, (!+, rl) and conversion lens-specific information or "1[variable information (d,,a,.

14+) from each lens. It's ours.

Examples of the carrier will be described below.

FIG. 1 is a block diagram showing an 1811-way configuration of an embodiment of the present invention. In this embodiment, when a conversion lens is attached between a camera body and a master lens, the combined focal length of both lenses is determined.

In the figure, the camera body (CB) and the conversion lens (CL) are electrically connected by a contact (TA>), and the conversion lens (CL) and the master lens (ML) are electrically connected by a contact (TB). The master lens (ML) is connected to the camera body (CLI).
) or a conversion lens (CL), and an 8-bit microcomputer (MC) (hereinafter referred to as microcomputer) that controls exposure calculations, focus adjustment, etc. is provided. This microcomputer (MC) has an output that commands the drive time of each circuit: a clock terminal (CLK) for serial output, an input terminal (SIN) for serially inputting data, a conversion lens (CL), and a master lens (ML). It is equipped with a terminal (C3) (hereinafter referred to as "chitsub select terminal").

Currently, Zoo 1 Lens is used as the master lens (Ml,). In this master lens (ML), a zoom encoder (1) encodes a signal ΔZ corresponding to a zoom operation, that is, a focal length setting operation, into 4 bits and outputs the encoded signal ΔZ. The decoder (2) counts and decodes the clock from the camera body (CB). Addressing circuit (3
) selects the signals from the encoder (1) and decoder (2) and specifies the address of the read-only memory (hereinafter referred to as R, OM), which will be described later.
I) is the master lens (Ml,,) for each address.
14 is stored in advance, and when an address is designated by this address circuit (3), the information written at that address is output in parallel. The P/S conversion circuit (5) converts the parallel signal sent from this ROM (4) into a serial signal and outputs it. The macro converter, which can change the magnification by changing the shooting magnification, is a conversion lens (
In CL), an encoder (6) for changing the photographing magnification encodes and outputs a signal ΔB corresponding to the photographing magnification (β2) that changes when a part of the lens is moved by an external operation. Decoder (7), address circuit (8), R,
The OM (9) and P/S conversion circuit (10) are the same as the decoder (2), address circuit (3), ROM (4), and P/S conversion circuit (5) of the master lens (ML>) described above, respectively. It has the following functions.

Further, the arithmetic circuit (11) is configured to operate P/S! φ conversion circuit (5) L
Information on the taking lens and the conversion lens that are projected from (10) is calculated, and the conversion lens is attached to the camera body (CB) and the master lens (Ml, ).
It serially outputs a signal indicating the lens information of the special 7 lens when it is installed between the camera and the camera. The S/P conversion circuit (12) converts the serial signal output from the arithmetic circuit (]T1 into a parallel signal 1a and outputs the 41 display circuit (13).
A conversion lens (CI) is provided on the outer cylinder, and an arithmetic circuit (1) is installed to decode and display this parallel signal.
1) and the drive timing of the S/P conversion circuit (12) are controlled by the output of the decoder (7).

Next, we will explain the contact parts (TA), ('l'')3) 6 Each contact part is made up of five contacts (Tl)~<75) and (T11)~(T15) W4 Contacts ('r 1 ) and (1' 11 ) are contacts for power supply from the camera body (CB) to the conversion lens (CL) and master lens (ML) circuits;
), (Tl2) is a contact for the input/output clock, (T3) is a contact for outputting the output signal of the calculation circuit (11) of the conversion lens (CL) to the camera side, and (T13) is the contact for the master lens (ML). , ) are the contacts for outputting the output signal of the P/S conversion circuit (5) to the conversion lens (C1, ), (T 4 ), (T l 4 ) are the contacts of the chip select river, (T5), ( T15> is a grounding contact.

FIG. 2 is a circuit diagram showing a specific example of the zoom encoder (1), decoder (2), and address circuit (3) of the master lens (ML). In 1 and 4, decoder (2)
is an 8n counter (21) that outputs a carry river pulse when 8 pulses are counted, and this counter (21).
), and depending on the count value of this counter (22), ROM<
Decoder 1 (4) specifies the contents of the lower 4 bits and the 11th 4 bits of the 8 bits of the address.
23) and decoder 2 (24). The selector (25) of the address circuit (3) is connected to the decoder 2
Depending on the content specified in (24), it is selected whether the lower 4 bits of the address in ROM (4) are to be used as data for decoder 1 (23) or data for zoom encoder (1).

This will be explained with reference to Tables 1 and 2 showing the data contents of the ROM. I! II, contact lT1
/I) via Chi7 Select! - When fdon4+(C8>) is input, the counters (21) and (22) are reset. At this time, the decoder (24) outputs the upper 4 bits as OH
, decoder (23) sets the lower 4 bits to OH and designates them as initial addresses. A check signal indicating attachment of the master lens is stored at address OOH of this ROM (4).

When eight clocks (CL, K) are input through the contact ('T'12>), the octal counter (21) generates one pulse 1. The counter (22) counts this pulse.

When the count number is ゛°bi', decoder 1 (23)
The content of is the 1st day, and the selector (25) is lt OM (
This RO specifies 01)1 as the address of 4).
The apex value (AVo) of the open aperture value at the shortest focal length of the zoom lens is stored at address 01H of M(4).When 2 pulses [1 are generated by manual input of the 0th-order 8 clocks, the counter (22 ) counts are °
゛2°', and the address of ROM (4) is 02.
H is specified 4 This +(,OM</I) address 0
2H stores the apex value (AVmax) of the minimum aperture value of the second master lens.

Next, when the third pulse is generated from the counter (21), the contents of the decoder 2 (24) become IH, and the selector (25) uses this as information on the lower 4 bits of the ROM (4) to output the zoom encoder (1). ). Therefore, l*H (* indicates the content of zoom encoder (1) at that time, for example, if the content of zoom encoder (1) is 0000, the address is +OH
Specify the contents of the ROM with the address ( ). This R
At address 1*H of OM(4), aperture value change data (ΔΔV) indicating how many Ev the aperture has changed j7 from the open aperture value at the focal length of [1 due to zooming is stored.

At the next 4th pulse, decoder 2 (24) becomes 2H, and R
The contents of the zoom encoder (1) are taken as the information of the lower 4 bits of OM (4). ROM (/I) address 2
*■(tI'1.' which changes depending on zooming)
, j data (",") indicating the distance is stored.

Based on Figure 3, the conversion lens (CL) encoder (6), decoder (7), address circuit (8)
Explain how it works. The decoder (7) has the same configuration as the decoder (2) in FIG. 2, and has an octal counter (51
), a counter (52), a decoder 3 (53), and a decoder 4 (54). Here, the decoder (5
3) and decoder 4 (54) specify the high-order 4 bits and low-order 4 bits of the 8 bits of the address of ROM (9) according to the count value of the counter (52).
x, the selector (55) of the address circuit (8) selects the lower four address bits of the ROM (9) in response to the signal from the decoder 3 (53).・Encoder (6) or decoder 4
(54) Select which data to use. Also, a ROM in which the lower 4 bits are specified by the encoder (6)
At address 1*H in (9), the image magnification (β2) that changes as the lens moves is stored in logarithmically compressed form.

-m, camera body (CB) and master lens (ML)
VT1 conversion lens between? Then, since the shooting information (for example, the maximum aperture value) related to the lens necessary for performing exposure calculation changes, the master lens (Ml
) If you send the shooting information as it is to the camera, you will not be able to perform accurate exposure calculations.7Especially, if you attach a conversion lens whose magnification changes as in this example, the shooting + ft information which changes according to the change in magnification will not work. The calculation to obtain is complicated as mentioned above. Therefore, in this embodiment, when the convergence lens (CL) is attached, the camera's photometry mode becomes aperture metering (so-called real aperture metering).
Exposure calculations can be performed even without lens shooting information such as the maximum aperture value.6 In other words, the shooting information C of the master lens (ML> does not change, but specific data from the conversion lens (CL) Send FF11 to the camera side, and the camera side receives this data and sets the aperture to metering mode.Then, this specific information is sent to the RO.
It is stored in memory at address OOH of M(9), and when the third pulse is sent from the octal counter (51), this data is sent to the camera l! through the arithmetic circuit (11).
Control (signal) to send to Ill.

Note that if you attach a conversion lens with a fixed magnification, you only need to change the aperture of the master lens (ML) by that magnification bone, so correct the aperture in the conversion lens (CL) before sending it to the camera. may be,
That is, in this case, all you have to do is add the magnification bone (ΔA'v) to ΔAv and send this data. Then, the camera body (C
In B), AVo+(ΔAv+ΔA'v), Avmax
+(ΔAv+ΔA'v) to find the maximum aperture value and minimum aperture value of the entire photographing optical system, and #ll
The combined focal length (r[) of the entire photographing optical system changes depending on the data of the Ill vehicle shadow β2). In the camera body (CB), the camera shake warning shutter speed is changed according to the value of this composite focal length. Therefore, the data of the photographing magnification (β2) is sent to the camera body (CB) following the above specific information, that is, the data of the octal counter (5
When 4 pulses occur from 1), address 1*g in ROM (9) is specified, and the image magnification (β2) data is set to R.
The timing of this data output is determined by the octal counter (2) of the master lens (ML).
4 pulses are generated from 1), address 2*to1 of ROM (4>) is specified, and P/S'ff1tlkri!
l road <5), t1 point ('l' 13) wosuke 1. This is when the focal length (1) information is sent. Therefore, when the fourth pulse is counted by the counter (22), the address 1*H of the ROM (9) is specified. The calculation circuit (11) then calculates the composite focal length.The control signal (a) is also sent to the S/P conversion circuit (12).
As a result, the result of the above calculation is converted into a serial signal, and the resulting focal length (ie, the combined focal length) is displayed on the display circuit (13).

Next, the arithmetic circuit (11) will be explained based on FIGS. 4 and 5. The arithmetic circuit in Fig. 4 is composed of a series addition circuit, and consists of the logarithm value of the focal pressure M (fl) sent from the P/S conversion circuit (5) of the master lens (ML) and the conversion lens (CL). P/S conversion circuit (10)
This is to calculate the sum of the logarithm of the shadow magnification (β2) of 111'1 sent from 111'1 and the resultant focal point 21'', (-4,·β,).

First 1 Kotoku pulse (chip before CLI<>.

The select signal % (CS) is input, and the carry information (Cy) output from the block 4.1 of the flip-flop (FF1) is reset by this 1,000-tube select signal (C8). Next, in synchronization with the clock pulse (CLK), the master lens (ML) and the conversion lens (
Two serial data D sent from each P/S conversion circuit (5) and (10) of CL). and Dl are input to two input terminals A and B after +lIa from the lower bit. The gate (ERl> outputs the exclusive OR of inputs A and B, and this output (So) is then exclusive ORed with the carry information (Cy) in gates 1 to (ER,). (Output S1
), and gate (AN)) through / agate (OR
The carry information output (S,) that is inverted by , ) is the addition of the next digit? For l1ll calculation, D flip-flop (FF
1), the signal is delayed by one clock and output. In the example of FIG. 5, the data D0 of the photographing lens (ML) is “0001111.
0", conversion lens (data D1 of C1, j is "00001010" and digit 1-8 signal is 00
011 + On''', and the sum signal (S) is '0
('l l (11(l O(1''), control number 18 (a) from decoder 3 ("+3) is "1.ou+
When the level is °, open the Antogame h <AN5) and take the data 1) of the photographing lens (M). Let H pass through as is.
When the level is “high”, open the AND gate (AN6),
1- Output the calculation result S. On the other hand, control signal (b)
is at the AND gate (AN8
), open the conversion lens (CL) data [),
is passed through as it is, and when it is at the "Low" level, the 1st data or calculation result is output.

The operation of the microcomputer (MC) of the camera body (CB) will be explained and explained according to the flowchart shown in FIG.

When the camera's metering switch (Sl) is turned on (#1)
, the microcontroller (MC) sends the chip select signal (C8) to “
"Low" level #3), initialize the count number N to "0"(#4), output a serial command, and connect the serial input/output 1fl clock (CL, K) to the contact (T2). (#5). When this input/output operation is performed 5 times (#7), the chip select signal (C8) is set to "HiR".
h” level (#8), completes the serial input/output of data, performs photometry in the sixth step, and performs exposure calculation based on this result (#12° #14). Note that steps #5 to #
ΔA of the data read into the camera body (CB) in step 7
Determine the contents of v, and if ΔAv is FF11, set the aperture metering mode and calculate only the shutter speed.8-4<) (#12); If ΔAv is FF11, then Avn+ΔA v,
Calculate A vsax + ΔAv and calculate in the set mode (#14), ? l11 optical switch (Sl
) is still ON or not #15)
If it is ON, the process returns to step #3 and the above-described operation is repeated. On the other hand, if it is OFF, the microcomputer (MC)
Stop the oscillation of the system clock and enter the stop 1 mode. Also, when the release switch is closed, exposure control is performed based on calculation results.

Next, see section 11'; 4 for the overall circuit operation.1. I will explain. The time chart is shown in No. 71211. When the photometry switch (Sl) is turned on, the chip select signal becomes “Low” level, and the decoders (2) and (7)
) starts counting. And master lens (ML)
), the 8-bit R specified by the address circuit (3)
The content of OM (4) is read out, and the most significant bit of this content is sent from the P/S conversion circuit (5) via the contact (Tll) at the first 1γ1/4 of the serial input/output clock (CLK). At this time, the arithmetic circuit (11) outputs both the control signals (a) and (1,) of the decoder (7) as "
Since it is 'Low', the above bit signal is output directly to the camera body (CB) via the contact (T3).Hereafter,
In synchronization with the rising edge of the 111st clock, ROM (4)
The contents of 6F are converted bit by bit into a serial signal by the P/S conversion circuit (5) and output to the camera body (CB).
As described above, the operation of outputting the data in the ROM (4) as is to the camera body (CB) is performed three times.

Then, when three 1 pulses are output from the octal counter (51) of the convergence lens (CL), the decoder (53) and decoder (54) designate address 00■ of the ROM (9). At this time, the control signal (b) is “”
HiI? h” level, and the contents of this ROM (9), for example, FFI+, are converted into a serial signal and transmitted to the camera body (CB).

Next, when the fourth pulse is output, the master lens (
Focal length information (r,) of ML) tends to be in ROM (4) P/
It is output to the 1.
At the same time, the content of the WI shadow magnification (β, ) of the conversion lens (CL) is read out, calculated, and output to the calculation circuit (11) of the conversion lens (CL).
A control signal is output from the decoder (7) for conversion. In synchronization with this control signal, the decoder (7) and encoder (6)
) is output to the P/S conversion circuit (10), and the P/S conversion circuit (10)
The signal is S-converted and output to the arithmetic circuit (11). The arithmetic circuit (11) operates in synchronization with the control signal 12.
)/S conversion circuits (5) and (10) sequentially output from the F position, and the result of this calculation is output to the camera side! (S, /P conversion circuit (12) is output. When the S / P conversion circuit (12) finishes inputting the calculation result signal, it converts it into a parallel signal and outputs it to the display circuit (13). Then, this display circuit (13) displays the composite focal length 1111 ("t").Microcomputer (MC)
When the input of the above calculation result is completed, the chip select I
- Set the signal to “High” level and end serial input/output.

Figures 8 and 9 show the external appearance of the conversion 1/lens (CL,) of this embodiment.The outer cylinder is provided with a display section (D>) in the direction perpendicular to the optical axis.The display contents The first
The +fTOTAL and ml11 displays shown in Figure 0 are printed out, and only the 4-digit, 7-segment numerical value is displayed, for example, on a liquid crystal display. Further, the outer cylinder is provided with an operation ring (C) for manually changing the photographing magnification.

In the shoes example, a zoom lens was used as the master lens, but a lens with a fixed focus may also be used. In that case, delete the zoom encoder (1) [7. The contents of the open aperture value, minimum aperture value, and focal length are stored in memory. [7taF(OM
(!'i) If you need each piece of information in 7 and 1-9, you can read out each piece of information separately.

In the above-described embodiment, the composite focal length was calculated, but the following 4 embodiments also calculate the composite photographic magnification, photographing distance, depth of field, etc. in addition to the composite focal length. In this embodiment, the circuit configuration of the conversion lens is mainly shown with respect to the W round portion and its operation, which is different from the previous embodiment.

FIG. 11 shows a 11792 diagram of the circuit. It is in the figure,
S/P conversion circuit (101H, f, 4 encoders (102
) is a switch (SWt) for selecting the shooting information to be displayed.
) to (SW5) are input, and this switch f
Code f19N. Microcontroller (MC2) is ROM
, a one-chip microcomputer with built-in RAM,
Calculates information sent from the master lens (ML>)
Process. The P/S conversion circuit (103) is a microcomputer (v
The parallel signal sent from t':z> is converted to a serial signal and sent to the camera body (
The decoder 7 (104) transmits the signal from the microcomputer (M c ,) to the decoder 11 and the display unit 2 (
105)). encoder <1.07)
detects the extended position of the operating ring (C) of the converter lens (lens position), encodes a signal corresponding to the edge position, and outputs the coded signal to the microcomputer (MC).

-1 The operation of the two-legged circuit is shown in the flowchart of the microcomputer (MC) of the camera 1111 in Figure 12, the microcomputer (MC2) of the convergence lens of the 131A and 14 countries.
7 First, the flowchart of the microcomputer (MC) on the camera side is explained with reference to flowchart 1.
7 compared with the flowchart in Figure 6, the serial human output (
SIO) The difference is that the number of tied moves is now 7 times instead of 5. Furthermore, the data sent from the conversion lens in the 6th and 7th STO @ work will not be used.

When the photometry switch (Sl) is turned on (#21>, the chip select signal C8 changes to "!-0 level", and this t down signal is input to the IN'F terminal of the conversion lens microcomputer (MC7). By microcontroller (M
An interrupt occurs in C, ), and the interrupt flow shown in Figure 13 is executed.
twice as fast).

In the flow shown in Figure 13, first, interrupts are disabled and the internal RA
M and the flag are reset and the count flag (CF
) (#51-853), then set the output terminal (O
P, ) to the "Low" level (#54) 7 This "Low" level signal is the display device R? <105) and controls the display operation of the display device (lr)5)7
Also, the count numbers i and N are seasonal settings (i-0, N=0)
(#'5'+, #56).

Next, the value of N is determined. If it is 11.5 or higher, the process moves to step #62 without outputting data to the P/S conversion circuit, and if it is less than 5, the count flag (CF) is set to 1'+1 constant. Do it (#58). Since this flag (CF) is now set, the process advances to step #59 and the ROM address 0NH is set.
(that is, the upper 4 bits are set to 0 and the lower 4 bits are set to the value N). As a result, the ROM data stored at the specified address is output to the P/S conversion circuit (103) (#61) - then the serial input/output clock (
CLK) stands up and adds 1 to 1 (#62) and (
#63) Determine whether i has become 8 (#6
4). If it is not 8, the specified waiting time (#65
), the process returns to step #62. The reason for providing this waiting time is because the serial input/output clock (CLK)
However, since it is slower than the clock of the microcontroller (MC2), there is a possibility that the loop of steps #62 to #64 will be repeated several times with one falling edge of the serial input/output clock.To prevent this, It is. When i becomes 8 (that is, 8 serial input/output clocks (CLK) are sent), the microcomputer (MCz) inputs the contents of the S/P conversion circuit (1, 01) and stores it in the specified register (INH). (#68.#67).

The P/S changing circuit (5) of the master lens uses a clock (
The S/P conversion circuit (101) of the conversion lens takes in this data and performs S/P conversion on the rising edge of TARLOCK.

Therefore, in this state, the P/S conversion circuit of the master lens (
5) converts 8-bit information into S/P transformation i/II (101
) and output to a converged lens (CI,
The S/P conversion circuit (101) of ) has finished converting a manually generated serial signal into a parallel signal. and N
Add 1 to (#68), I-, write steps #56 to #6
By repeating the operation 8 seven times (#69), the microcomputer (MC2) finishes inputting data from the master lens necessary for calculations to be described later.

In addition, the microcomputer (MC
? ) is assigned a predetermined master lens (for example, f='50m+m, FNllll, 7>), and this converter lens is located at 4QM, which indicates a predetermined magnification. Lens data including the lens is stored.The reason why this specific data is first output to the camera as described in F is for the following reason 6: On the camera side, based on data from the lens, exposure Calculation and focus control are performed, but if a conversion lens is installed between the camera base and the master lens, it is necessary to calculate accurate lens data using the data of the master lens and the data of the conversion lens. In this case, since the calculation takes a certain amount of time, it is not possible to send the +EN data to the camera at the same time as taking out the specified data from the master lens. However, there are problems such as the exposure calculation information not being displayed immediately after pressing the camera's metering switch (Sl), and the start of the focusing operation being delayed because there is no lens data, which is not desirable. , 2,] and 5. Specific data such as , , and 5 are output as dummy data for calculations in the camera.

Data contents, master lens and microcomputer (MC2)
Table 3 shows the relationship between the ROM address, RAM (register) designation described later, and SW1 to SW5.

The circuit tank of the master lens is the same as in Figure 1, but R
The point that OM(4) has two more contents becomes W. One of them is '#M(e-') from the mount of the master lens to the rear principal point, which is stored in address 231 (.The rest are the distances between the front principal point and the rear principal point of the master lens. (d,), which changes with zooming in the case of a zoom lens.

This data is stored at address 3*t* of the ROM (4), where * is input with a signal coded according to zooming.

Let's continue the explanation by referring to the flow of the microcomputer (MC). After the microcomputer (MC2) finishes outputting the data from the master lens and the data to the camera 1111+, it performs necessary data calculations based on the data from the master lens and the data from the conversion lens. #70), the detailed flow of this calculation is shown in Figure 14. First, the microcomputer (MC2)
The contents of M (register 10H) are stored in RAM (register 20H).
H) (#100), then the encoder (107) reads the code data indicating the lens position of the conversion lens, and this data causes the microcomputer (M
Specify register 2*■ in the ROM of C2), read out the logarithm value laRβ of the imaging magnification of the conversion lens, and store it in RAM (register 2AH>) (#
102~#l06).

In addition, data coded according to the position of the conversion lens is input as 4-bit information to the * of address 2*H above, and the logarithm value of the focal length read from the master lens using the flow described above. 1ogf+ to RAM (register 1
4H), and calculate the sum with the logarithm value Flayβ of the photographing magnification of the conversion lens (#108).
#110), 7 microcontrollers (MCt), which calculates the composite focal length (ft=β2·f,) when the conversion lens is attached in a logarithmically compressed form, are 'l!' at this composite focal point. M (logft,) is stored in the RAM (register 24H) (#1t2).

Next, the composite imaging magnification β is calculated. Here, first, the imaging magnification β1 of the master lens when the conversion lens is attached is calculated6.Then, the lens position of the conversion lens is read again from the encoder (107) (#L
14) ROM address 1*H according to this lens position
, 4*H, respectively, one inch behind the conversion lens from the film surface! read out the distance NB1 to the lens 2 and the distance Ne2 from the front principal point of the conversion lens to the mount on the r1 master lens side.
9■(,2D), memorize to +1 (#114~
#118).

Also, R A M (register 148) indicates the logarithm value loI of the master lens focal length? Read f, #120
) Logarithmically expand this and store it in RAM (register 2C11) (#122, 124).Similarly, logarithmically expand the logarithm value 1o1<β2 of the imaging magnification of the conversion lens and store it in RAM (register 2C11). Memory (#
126~#130). Then, the distance ex from the front principal point of the convergence lens to the mount 1 of the master lens 11!1, the focal length of the master lens #r5. Distance met from the mount of the master lens to the rear principal point, tm shadow magnification β2 of the conversion lens. Distance B from the film plane to the rear principal point of the conversion lens.

are RAM registers 2D11, 2C11, and 15, respectively.
+1゜2E11, Read from 29+1 and get β+= 1
1 /f+(e++e2 + B + /β2) # L 32, #134), and this value β is l(AM
(register 2Blf) (#l36), then L7, add this [9 magnification βl vs. Take (#138~#142
). As a result, the composite imaging magnification β (-=β1·β,) is obtained in a logarithmically compressed form.

This value is stored in RAM (register 25H).

(#144>. Next, calculate V + 5 M +) from the film surface to the arytenoid body.Here, the focal point of the master lens is 1. Read the distance between the front principal point and the rear principal point (+1゜ fJc direction of the master lens, 1 ton Ife from the P point to the mount) from the registers 2 CI+ and 2 R11゜1611.1511 of R and AM, respectively. The distance B2 from the film surface to the mount of the master lens IIn of the convergence triple lens is read from the ROM, and the distance ND from the film surface to the subject is calculated using the formula D = "1 (1-1/βl) + d+ + el.
+B2 (#146 to #150), and the shooting distance is stored in the RAM (register 261-1').

Next, the depths of field a and b are calculated. Here, R.A.
M (Register 25H) Logarithmic value eo of composite shooting magnification
Read gβ1. From this value β, (1+β
) and performs logarithmic compression to obtain RAM (register 2
FI+) (#I54 to #160), then the conversion lens photographic magnification statement ORβ2, the composite photographic magnification logβ, foR(1+β), and the master lens (
Open aperture value Avo at the shortest fish point distance (zoom lens),
The aperture change acid ΔAv due to zooming is shown in the RAM register 2AI1.2511°2.
Fil, I I I+, 1311 Read (#
162), Part I, is the depth of field at the time of the lever determined?This is done by assuming the permissible circle of confusion diameter to be I/30 Inm. When is the open aperture value and ΔF is the aperture change from the open aperture value≠, the front depth a and the t pot depth 11 can be obtained by the formula. Taking the logarithm here is + t'ogFo + logΔF, and if the master lens is in the open state, 1o1ta
= 10rb = -foe:to + laRβ
t+2(fog(1+β)−Nogβ)+(^v
0+Δ^v)/2. Therefore, this calculation can be expressed as the logarithmic compression value of the depth of field when the aperture is wide open (loI?a= Nogb
) is determined (#164) and stored in the RAM (register 27H) (#164, #166).

Next, the effective aperture value Ave is calculated. Here, the logarithm of the imaging magnification of the conversion lens loRβ3, oI?
(L+β) and the aperture change range Δ^V due to zooming are stored in rL A M registers 2A11 and 2FI+, respectively.

1311 and find the effective number of aperture steps when the conversion lens is attached (#168, #170
). The current effective aperture value Fe is Fe=Fβ2(1+β)=(Fax△F)β, (1+β
), and this logarithmically compressed result is NogFe=1oHF, +1oHΔF+1ottβ2
+log< 1+β)=(^v0+Δ^v)/2 +
It becomes logβ2+eog(1+β). And if the effective aperture value is expressed in apex, A ve = 21oHF e
= A v6+ΔA V+ 2 ((logβ, +-N
og(1+β)). If we were to transmit the maximum aperture value of the master lens to the camera as is, we would install a convergence 9 lens.1. The overall change in effective aperture when
+β)). The effective aperture change amount ΔAve obtained in this way is stored in the RAM (register 23H) (#172), and then the open aperture value Avo and the two-way effective aperture change number ΔAve are stored in the RAM (register 11H12).
3+1) and find the effective aperture value (Awe),
Memory in RAM (register 28■) (#+7
4 to #178), then move the contents of RAM register 11H to register 21H and the contents of register +21'l to register 22 +-1, and return to the original routine (#180 to #]84 ).

When returning to the original routine, the count flag (CNTI") is first reset (#71), and then the lens information lJ7 f! switch signal is manually input from the encoder (102>) to operate which switch. (#74), and specifies the RAM register in which the corresponding lens information is stored 7, and outputs the specified contents to the decoder (10-1) and outputs a signal indicating the switch information. 1 (#76).In order to display the decoded contents on this decoder (101I), the display device ff (105) is connected to the output terminal (QPI).
A "HiHb" signal is output to (#78>, and the desired lens information is thereby displayed on the display device (1, 05>).

Next, proceed to step #79 and start the timer. This timer is configured by the hardware inside the microcomputer (MC2), and the metering switch (Sl) on the camera side is turned on.
After a certain period of time, this microcomputer (MC2)
It is meant to stop the operation.

Determine whether 3 seconds have elapsed in step #80. If 3 seconds have not elapsed, proceed to step #81 and check the fall of the chip select signal (C3) from the camera body to start the next serial input/output. Determine (#81). If this falling signal is not received, the process returns to step #80 and this routine is repeated. If the photometry switch (Sl) is turned on, the falling edge of the chip select signal (C8) will be output from the camera within 3 seconds, so when this rising signal is input to the input terminal (IPl), the microcontroller ( MC2) sets the timer to stop L (#82) and returns to step #55.

In step #55, the count number, N, i
Initialize and perform step #57. Proceed to #58. In step #58, since the counter flag (CF) is set, the process proceeds to step #60, and register 2NH of the RAM is specified.

This content will be output to camera tilII. Here, the data calculated or transferred in the calculation subroutine of upper 34B is stored in the register 2N11 of the RAM. Therefore, the content output to the camera side at 11 is check data, and the following is the open aperture value A v n
, *Data on the small aperture value Avx, the aperture change range ΔAv due to zooming, and the composite focal length 1rt are sequentially sent to the camera body. Below steps #61 to #71 -E
The calculation section of the camera repeats the above-described flow, and calculates the effective aperture value (A v
Calculation is performed based on ΔA ve), and exposure control is performed based on the result of this calculation.

The display segment in this variation of the display section (D) is shown in FIG. 15, and the display contents are shown in FIG. 16]A. In FIG. ) shows the composite photographing magnification (β), (1) shows the distance from the film surface to the subject (D), (1) shows the effective aperture value (Fe), and (o) shows an example of the display state of the depth of field.

Meanwhile, in step #80, the photometry switch (Sl)
When 3 seconds have passed since 01SF was performed, the microcontroller (MC)
2) resets RAM and flags and also outputs (O
P, ) is set to "Low" level to prohibit the display operation of the display device (105) #84), enable interrupts (#85), and then stop ($86).

Furthermore, the 141st:? In the calculation subroutine 1, the distance e1 from the mount surface of the master lens to the rear principal point was set constant, but in reality, this distance varies somewhat.

However, the amount of change is very small compared to the whole, so
Even if this is almost constant, it will not result in a large error. In order to eliminate this error, a code plate is provided on the 114-node ring of the master lens, and an encoder is installed that reads the code data of this code plate and specifies the address of It OM. established,
The information of the distance j; and the distance #c corresponding to the position of the 1-node ring may be stored in the corresponding address of Ft OM.

The contents of each signal in the flow shown in -1- will be explained with reference to the time chart shown in No. 1714. First, when the photometry switch (Sl) on the camera side is turned on, the chip select signal (C9) falls, a falling signal is input to the interrupt terminal (INT) of the microcomputer (MC2), and the flow described above is executed. . Then, from the camera side, input terminal (when 8 locks are sent to the IP, one data input/output is input/output) 1
ends.

When such data input/output is repeated 312 a total of seven times, the chip select signal (C8) goes to High+'' level.The chip select signal (C9) falls to perform serial input/output again. When the input/output of the same seven pieces of data is completed, the output terminal (OP,) of the microcomputer (MC2) becomes ``High'' level, and the display section W
(io5) Open the lens information display (lfJ6) Then, after the photometry switch (Sl) is turned OFF,
When the microcomputer (MC, ) reaches step #80, if 3 seconds is suitable, the output terminal (01), ) is set to °'1. ow
The display turns off and the microcontroller (MC)
stops working. Below, examples are shown based on the present invention, but the present invention is not limited thereto. For example, a display device! (1
As shown in Fig. 18, the content of the display in 05) is more convenient if it is possible to display the subject pressure 1ll (DJ and depth of field at the same time. A circuit similar to that of the conversion lens may be installed to display the subject distance and depth of field.Also, the conversion lens is not limited to the Makame 7 converter, but can be used with a teleconverter as well. You can do things.

A third embodiment of the invention will be described below. In this example,
Where simple calculations are possible, they are performed using the calculation circuit shown in No. 4m, and the data is sent via a single serial input/output to the camera side, and all complex information from the master lens side is input beforehand. Operations that would otherwise be impossible are performed by a microcomputer.

Shown in Figure 19! The circuit configuration shown in Figure 7 is basically as shown in Figures 1 and 1.
The 6 differences, which are a combination of the configurations in Figure 1, are the 11th
By adding serial input/output functions and display control functions compared to the microcontroller shown in the figure, the S/P conversion circuit i shown in Fig.
? 8 (101), P/S conversion circuit <1.03), and decoder (104) were deleted. Also selector 1
By adding selector 2, it is possible to select whether to send the data output to the camera side from the arithmetic circuit or from the microcomputer (MC1). In addition, in the above-mentioned embodiment, the ROM address OnH is set to F.
Contains FH specific information, and this content is sent to the arithmetic circuit, which then sends it as is to the camera and is used for initial calculations in the camera body.In this example, the conversion lens Depending on the position of 2*H
, and add β to that address.
Enter the logarithm value of (1+β). Here, β is the imaging magnification of the conversion lens that changes depending on the lens position of the convergence lens, and β is the composite imaging magnification β=β1β2. In this case, since 0 and β≦1, the intermediate value β=0.5 is adopted. Then, the arithmetic circuit calculates the sum of the aperture change amount ΔAV due to zooming sent from the zoom lens (master lens), and transmits the sum to the camera side.

To briefly explain the overall flow, from the first serial input/output to 311!10, the master lens information is sent as is to the camera side, as in Figure 1. 4
times I], the calculation times 1/3 (211) as described above.
In this step, information obtained by adding the information of β, (1+β) of the conversion lens and the aperture change amount ΔAν of the master lens is sent to the camera side. The focal length of the master lens is 1oI? The sum of f1 and the imaging magnification log β2 of the conversion lens is calculated as the composite focal length 1.
Find olIft and transmit it to the camera side. Microcomputer (MC)
1) Among the above information, the open aperture value AVO and the aperture change amount Δ at the shortest focal length of the master lens (zoom lens)
Input Av and the composite focal length "t," and then use the following two serial inputs and outputs to calculate the distance Mel from the master lens's mount; to the rear principal point, and the distance d1 between the master lens's front 1: point and the rear principal point. After the serial input is performed seven times in F, the microcomputer (MC3) calculates the shooting distance, and performs the same operation as the flow shown in Figure 13 to perform serial input/output again. At this time, the 4th serial input/output, that is, the input f#J on the camera side.
When transmitting the number of aperture stages (ΔAve), the accurate value obtained by performing the distribution calculation is transmitted to the camera side. Other than that, it is the same as the serial input/output described above.

Next, the operation of the microcontroller (MCs) will be explained with reference to the flowchart shown in the 20th country. Only the points that differ from the flowchart shown in Fig. 13 will be explained. First, when an interrupt occurs, , the timer is started in step #204.The microcomputer (MC3) related to this timer
), the microcomputer (M c j) completes serial input/output t1 7 times (#2"30), performs the calculation (#232), and checks whether 3 seconds have elapsed in step #242. If 3 seconds have not elapsed, the chip select signal (C3) is changed to °“l-1-1” in the next step.
Determine whether or not the level has reached "i". "Hi1?" h
” level, the count flag (CNTF) is reset (#246), the timer is reset and restarted (#250), and the process returns to step #210.

Selector 1 in Figure 19. (214), selector 2 (21
5) After interrupt 6 to explain the control and serial input/output, in step #208, the output terminals (o p p), (o
p,) to “Low” level, and the arithmetic circuit <21
'I lot' of 4 serial input/outputs to output the outputs of 1> to the microcomputer (MC*) - camera body, respectively.
"+, that is, the number of effective aperture stages ΔAv (1), except for data transfer, the process moves from step #212 to step #222 where a serial command is executed. When the serial input/output is the fourth time, the output terminal (OR3) is set to "HiHl+ ” level, the amount of aperture change ΔA due to master lens zooming
The microcomputer (M c ,) makes v human-powered (#
214), and after the calculation has been performed once (step #23
Pass 2 once! , W-), at the fourth serial input/output, the calculation result of the microcomputer < MC,) is output to the camera body.The output terminal (oP,) is set to "High" level and the RAM (register 231) is output to the camera body. -1), set the specified data in the serial input/output register, and then use the next serial command to set In1 to the rising edge of the serial clock, output the data one bit at a time, and synchronize with the falling edge of the serial clock. The data to be sent to the arithmetic circuit (211) is taken into the serial input/output register bit by bit (#218 and #220). Then, in step #222, a serial command is executed, and in 2.4, the RAM (register 12H114H) is specified to store the data necessary for the operation (#224.#226), and [7, 1, 3. In the same way for the fifth time, output terminal (o P 2), (OP
3) Set to "Low" level (#228) The above points are different from the flowchart shown in FIG. FIG. 21 shows a flowchart of the calculations in this embodiment. It is basically the same as the flowchart in FIG. 14, except that the register 1n1 is no longer needed.
transfer and a few operations.

Table 4 corresponds to Table 3 and shows the relationship between the contents of lens data, the R and OM addresses of the master lens and conversion lens, the RAM (register) designation of the microcomputer (MC3), and SW1 to SW5. be.

The present invention is not limited to the above-mentioned actual AP)4, but may take various forms. For example, in the above embodiment, the conversion lens performs 7am and then transfers the data to the camera. Increase the number of outputs [2
, all the lens information of the master lens and conversion lens is output to the microcomputer on the camera side, and the 141st-
All calculations may be performed on the camera side using the flow shown in FIG.

In addition, one contact point is added to the camera and the conversion lens, and the aperture value information calculated on the camera side and used for exposure control is sent to the conversion lens, and the conversion lens side calculates the effective aperture value and control mI based on this information.
The depth of field may be calculated using binary values4.The calculation is as follows: F notation tn + aperture value is the maximum aperture value (A
Information on how many stops to narrow down from vo+△Avp>
Av) is added to 1-th open aperture value (Avo+ΔAve) to obtain the limit (n aperture value<Avo+ΔAve+ΔAv). Also, the depth of field can be obtained by adding the above ΔAv. This information may be calculated on the camera side and transferred to the conversion lens.

In the embodiment described in L, everything is performed electrically, but such information may also be calculated mechanically.

For example, a bottle with a length corresponding to the focal length of the master lens (a protrusion from the mount) is provided on the master lens side, and a bottle with a length corresponding to the shooting magnification of the convergence lens (in other words, an operation ring for changing the shooting magnification) is provided on the convergence lens. When the conversion lens is attached between the master lens and the camera, the two bins connect and connect to each other. The length is the combined focal length, or rt=
β,・f, and the camera +11! f reaches l, and the camera jjjll also responds to this length [Explain the pin that changes with Z, detect this length 1. All you have to do is to detect the synthetic fish bis distance information. Further, even with a conversion lens, by detecting how much the pin of the conversion lens is pushed by the pin of the master lens, the combined focal length can be determined. If we consider rt=β2·rl in a logarithmically compressed form, we can find the composite focal length by the sum, so it becomes easier to simply consider the sum of the lengths.

Regarding the display, it was made to be displayed only on the conversion lens, but if you use mm on the camera side or 1v1. Needless to say, if the content is sent to the camera, it can be displayed on the camera.

Furthermore, in the embodiment, calculations and displays are shown only when a conversion lens is attached, but even when only a master lens is attached, calculations for obtaining each lens information can be performed and displayed. good.

Table 1 Table 2 Table 3 Table 4 According to the present invention, as described in E, both the lenses are Since the effective aperture value information determined by It is possible to prevent the inconvenience of adjusting the focus without knowing the aperture value.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the circuit configuration of a camera system to which the present invention is applied, Fig. 2 is a circuit diagram showing main parts of the master lens shown in Fig. 1, and Figs. The circuit diagram of the main part of the conversion lens and its timing chart, Fig. 6 is a flowchart showing the operation of the microcomputer in the camera body of Fig. 1, Fig. 7 is a timing chart of the flow of Fig. 6, Fig. 8 and Fig. 91M are A perspective view and a plane showing an example of a conversion lens [A, 10th
The figure is an external view showing an example of the display section in Fig. 8, Fig. 11 is a circuit diagram showing the other side of the circuit diagram in Fig. 3, and Figs.
Figure 4 is a flowchart showing the operation of the microcomputer of No. 111511, Figures 15 and 16 are diagrams showing the appearance of the display section and its display format adapted to the display in the flow of Figure 14, and Figure 17 is the diagram shown in Figure 12. Fig. 18 is a diagram showing the other side of the display section in Fig. 15, Fig. m19 is a circuit diagram showing still another example of the circuit diagram in Fig. 3, and Fig. Sakaki is a flowchart showing the operation of the microcomputer in No. 191A, Fig. 21 is a flowchart showing the main part of the flow in Fig. 20, and Fig. 22 shows the master lens and It is a diagram showing an optical system when a conversion lens is inserted between the camera body. ML: master lens, CL = conversion lens,
CB, camera body, 1-5: first information output means, 6-1
0: 2nd + r1 information output means, 1.1: output means Fig. 4 ANθ Fig. 5 S Lk Fig. 6 I1 Fig. 7

Claims (1)

[Claims] (1) In a camera system in which a conversion lens that can change magnification by moving a part of the lens is selectively inserted between the master lens and the camera body, output information that is unique or variable to the master lens. a first information output means, a second information output means that outputs information corresponding to the magnification changing operation of the conversion lens, and a master lens and a conversion lens based on the information of both the first and second information output means. A lens information calculation device comprising: calculation means for calculating effective aperture value information determined by a zooming operation.