JPH01221728A - Camera system - Google Patents

Abstract

PURPOSE:To eliminate the need for storing enormous data in a camera body by imparting 1st and 2nd lens groups and carrying out a prescribed control based on the result made by a discriminating means. CONSTITUTION:Based on data identifying lens group of mounted lens, it is judged to belong to which lens group. When the lens belonging to the 1st lens group is mounted, a prescribed control is performed based on 1st lens data stored in it and 2nd lens data stored in the camera body specified by type discriminating data. When the lens belonging to the 2nd lens group is mounted, a prescribed control is performed based on 1st and 2nd lens data stored in it. Namely, type identifying data specifies 2nd lens data inherent to the lens, and a 2nd function is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camera system that performs predetermined control using lens data stored in a lens and lens data stored in a camera body.

(Prior Art) As cameras become more multifunctional, the amount of lens data required for control on the camera body side is increasing.

Conventionally, data transmission through the mechanical connection between the lens and body is limited in both the type and accuracy of data that can be transmitted from the lens side to the camera body side. It is already well known that a ROM (read only memory) storing lens data unique to the lens is stored in the lens, and the lens data is electrically transmitted between the lens and the body.

In addition, each lens stores electrical signals specific to the lens, and the body stores unique lens data for each lens, and the data is stored on the body based on the electrical signals transmitted from the lenses. West German Patent No. 3,518,887 discloses a camera capable of controlling exposure by selecting the lens data of the lens in use.

(Problem to be solved by the invention) However, when cameras become more multi-functional and the lens data required for control on the camera body further increases, only the lens data necessary for the functions of the conventional camera is stored. With traditional lenses equipped with ROM, even if there is a mount integrity that guarantees data transmission between the lens and the new camera body, when the traditional lens is attached to a new body, the newly added functionality is lost. The camera body is not able to run.

Also, if the camera body stores unique lens data for each lens, this problem does not occur, but since unique lens data must be stored for each lens, it is necessary to store unique lens data for each lens. This means that a huge amount of data will be stored, making it impractical.

Therefore, an object of the present invention is to provide a camera system that can perform new functions using a conventional lens even when a camera body acquires new functions.

(Means for Solving the Problems) In order to achieve the above object, the camera system of the present invention provides a lens group indicating that it belongs to a first lens group among predetermined first and second lens groups. a first lens group having identification data, type discrimination data indicating the type of lens, and lens-specific first lens data necessary for the camera system to perform a predetermined first function; Lens group identification data indicating that it belongs to a lens group, first lens data, and lens-specific second lens data necessary for the camera system to perform a new second function that is not included in the first function. It consists of a second lens group and a camera body. The camera body has a second lens for the first lens group.
The lens comprises a storage means that stores lens data, a determination means that determines which lens group the attached lens belongs to, and a control means that performs predetermined control based on the result of the determination means.

(Function) With the above configuration, the determining means determines which lens group the attached lens belongs to, based on the lens group identification data of the attached lens, and based on the result, the controlling means determines which lens group the attached lens belongs to. When a lens belonging to the lens group is attached, both the first lens data stored in that lens and the second lens data stored in the camera body specified by the type discrimination data If a lens belonging to the second lens group is attached, predetermined control is performed based on the first and second lens data stored in the lens. conduct.

In other words, even if a lens belonging to the first lens group that does not have the second lens data necessary to perform the second function is attached, the second lens according to the type of lens is attached. Since the data is stored within the camera body, the system is not prevented from performing the second function.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall circuit configuration of an embodiment of the present invention. In Figure 1, the circuit inside the camera body (1
) and the circuit inside the photographing lens (β-), the mount part (
7) are electrically connected by contact groups (711) to (715) and (721) to (725).

(100) is a control circuit (hereinafter referred to as control CPU) that controls this system, and all of the circuits described below operate under instructions from the control CPU (100). (10) is a power supply that supplies a constant voltage to the control ficPU (100) and the circuit (6) in the photographing lens.

(310) is a photometry circuit that A/D converts the amount of photometric photoelectric conversion (corresponding to the subject brightness value) by a photometric element (not shown) that performs TTL photometry to obtain information regarding the subject brightness BV (more precisely, B V A V o: AV o is the open aperture value of the photographic lens) and is sent to the control CPU (100).

(320) is an exposure control circuit, and control CPU (100)
), the aperture device 1 (not shown) of the photographing lens and the shutter mechanism (not shown) of the camera are controlled.

<330) is a focus detection/control circuit, which includes a focus detection circuit (not shown) and a lens drive control circuit (not shown).

(340) is the camera's exposure mode, exposure control value (aperture value and shutter speed value), frame counter value,
This is a display circuit that displays photographing information such as in-focus/out-of-focus.

Reference numeral (350) is an auxiliary light circuit, which is turned on when focus detection is impossible under visible light.

The auxiliary light circuit built into the camera body is the same as that already filed by the present applicant in Japanese Patent Application No. 141538/1982.

(360) is a film sensitivity information circuit, which controls film sensitivity information based on the DX code read from the film cartridge of the film loaded in the camera.
Send to U (100).

(112) is a switch (SWl) that is closed by pushing the release button (not shown) to the first step, and (114) is a switch that is closed by pushing the release button deeper than the first step to the second step. This is the switch (SW2).

The oscillation circuit (370) supplies pulses to the control CPU (100).

Next, the mount section (7) will be explained. Mount part (
7) consists of a camera body side mount (71) and a photographic lens side mount (72), and in this embodiment, five pairs of electrical contact groups (711) to (715) and (721) to (725) are provided. Serial communication is possible between the camera body and lens through the circuit connection described below.

The control CPU (100) in the camera body has a clock output terminal 5ck (102) for serial input/output, and an input terminal 5in (10) for serially reading input data from the lens.
3), and an output terminal C3 (104) that commands the drive timing of the photographic lens internal circuit (0), and a contact point (712) on the body side mount section is connected to a clock output terminal 5ck (104).
02), the mount contact (713) has an input terminal of 5 inches (
103), the mount contact (714) is connected to the output terminal C3 (
104), respectively.

In addition, the contact (711) is connected to the power supply (10) via a short-circuit protection resistor (14), and the mount contact (711)
15) is grounded to the earth line of the circuit (1) inside the camera body.

Now assume that the photographic lens is a zoom lens.

A zoom encoder (61) encodes a signal ΔZ corresponding to a zoom operation, that is, a focal length setting operation, into 3 bits and outputs the encoded signal ΔZ. The decoder (62) counts and decodes clock pulses from the clock output terminal 5ck (102) of the control CPU (100). Addressing circuit (63
) is the encoder (61) and the decoder (62).
), and specify the address of a read-only memory (64...hereinafter referred to as ROM), which will be described later.

The ROM (64) stores in advance unique information for each address regarding the photographic lens in which the ROM (64) is mounted.

ROM (64) by the above addressing circuit (63)
When an address is designated, the information stored at that address is output in parallel from the ROM (64). The P/S conversion circuit (65) converts the parallel signal sent from this ROM (64) into a serial signal and sends it to the control CPU (10) via the mount contacts (723) and (713).
0) is output to the input terminal S in (103).

In addition, the circuit inside the photographic lens (6) has a mount contact (7).
A constant voltage Vcc is supplied via the terminal 21), and is connected to the ground line via the mount contact (725).

FIG. 2 shows three input/output terminals 5ck (102), 5in (103), and C in the control CPU (100) shown in FIG.
3 (104) in detail.

A high enable circuit is connected to the output terminal 5ck (102), and a serial boat control register (S
CKC) is high, a clock pulse is output from the body side to the lens side. Serial counter (12
0) is a 3-bit counter for counting 1 byte (8 clock pulses). When the serial counter (120) counts clock pulses for 1 byte (8 pieces), the serial counter (120)
Generates an interrupt signal (INT) to the PU (100).

The input terminal 5in (103) is connected to the serial register (12
1), and the serial register (121) holds data transmitted one bit at a time from a specific address of the ROM (64) in response to a clock pulse. ROM (64) held in serial register (121)
) is stored in a random access memory (hereinafter referred to as RAM) in the body in response to an interrupt signal generated by the serial counter (120).

Next, FIG. 3 shows an exploded perspective view of the schematic structure of the focus detection optical device used in the present invention.

In FIG. 3, TL, TL are photographic lenses, and these photographic lenses TL, TL are located at distances PZ, , PZ2 (PZI<PZ2) from the expected imaging plane FP (hereinafter referred to as this distance). (referred to as the exit pupil distance). Then, a field mask F is placed near the planned imaging plane FP.
M is placed. A horizontally long rectangular opening Eo is provided in the center of the field mask FM, while vertically long rectangular openings EOI and EO2 are provided on both sides. Above field mask F
Each rectangular opening Eo of M.

The light beams that have passed through E O+ and E o2 are passed through condenser lenses Lo, Lo1. They each pass through Lo2 and are focused.

The re-imaging lens plate includes re-imaging lenses ,L, arranged in the horizontal direction in the center, and re-imaging lenses 3+L4 and Lj, L, arranged in the vertical direction on both sides. ing. The re-imaging lenses 1 to L6 are all plano-convex lenses having the same radius of curvature. The aperture mask AM is provided with aperture openings A1 to A at positions corresponding to the reimaging lenses L1 to L6. This diaphragm mask AM is placed just in front of the re-imaging lens plate, and is in close contact with the flat portion of the re-imaging lens plate.

The CCD line sensor Po is arranged horizontally in the center of the board.1. In addition, CCDC line sensor PoPO2
are arranged vertically on both sides of the substrate, and are aligned with the arrangement direction of the re-imaging lens pair on the re-imaging lens plate and the CC
The direction is made to be the same as that of the D line sensor.

The above CCD line sensors Po, Pop, and Po2 are 1. 1st each. It has two second rows of light-receiving elements, and separately photoelectrically converts the two images re-formed on the CCD line sensor by the re-imaging lens pair.

A block AF surrounded by a dotted line in the figure indicates an AF (autofocus) sensor module.

The focus detection optical device having the above configuration detects the focus position in the following manner. Chief ray 1. ．． 1. Photographic lens T including
The light beam for off-axis pressure measurement of the object in the area off the optical axis of L enters the field mask FM and passes through the rectangular opening Eo so as to leave the optical axis at a predetermined angle with respect to the optical axis. and enters the condenser lens Lo. The off-axis distance light flux incident on the condenser lens Lo is the condenser lens Lo.

The light is bent and focused toward the optical axis by the diaphragm mask AM, and is incident on the re-image forming lens plates L s and L 4 of the re-image forming lens plate through the aperture openings A 3 and A 4 of the aperture mask AM. The optical axis distance measuring light beam incident on the re-imaging lens L3 + L4 is converted to C by the re-imaging lens L, , L.
The light is focused onto the CD line sensor Po, and a pair of images is re-imaged onto this CCD line sensor Po+. Similarly, chief rays 17,1 . The optical axis distance measuring light beam including the above-mentioned predetermined angle is incident on the field mask FM so as to be separated from the optical axis, and passes through the rectangular opening Eo2, the condenser lens Lo2, the diaphragm opening A1 . A@ and reimaging lens L,.

After passing through L6, the light is focused onto the CCD line sensor Po2, and a pair of images is re-formed on this CCD line sensor Poz.

On the other hand, the light beam for distance measurement on the optical axis from the subject in the area including the principal rays 1+ and 12 and including the optical axis of the photographing lens TL includes a rectangular aperture Eo on the optical axis, a condenser lens Lo, an aperture aperture A, , A2, and reimaging lenses L + , L
2, is focused on the CCD line sensor Po,
A pair of images is re-imaged on this CCD line sensor Po. And the above CCD line sensor P o , P
o By determining the positions of the three pairs of re-imaged images formed on I and Po2, the taking lens TL,
and TL, the focal position of the subject is detected.

In terms of correspondence with the viewfinder view shown in Figure 4,
The CCD line sensor Po is located in the axial focus detection area Fa,
The CD line sensor Po1 has an optical axis focus detection area Fa, and the CCDC line sensor Pa has an optical axis focus detection area Fa.
2 respectively.

A mouth + A 2 indicated by a broken line on the above photographing lens TLI
11 A 311 A 411 A s + and A
61 and A1□ indicated by a broken line on the photographic lens T L 2.
, A2□+ A321 A421A5□ and A62 respectively represent the aperture opening A + of the aperture mask AM.
, A 2 , A 3 , A 4 , A s and A6 are condenser lenses Lo, Lot and LO2
2 shows images back-projected onto the photographing lens TL and the photographing lens TL2. That is, the aperture opening A +
, A 2 , A 3 , A 4 As, and A6, the distance measuring light beams passing through the photographing lenses TLI and TL are shown. Therefore, this back projection image A1. .

A 21 , A 3 H, A 41 , A 51 and A6. Or A1□.

A22, A32, A42, A52
If A6□ and A6□ fit within the aperture of the photographing lens TL or TL, the CCD line sensors P o, P
The luminous flux incident on the photographing lens TL
Alternatively, high focusing accuracy can be obtained without vignetting for the pupil of TL2.

Here, in any case, the fact that the light flux for optical axis distance measurement incident on the CCD line sensors Po, Po2 does not eclipse the pupil of the photographing lens means that Chief ray l of the distance beam.

In a state where the distance y from the optical axis on the planned imaging plane FP of 14, ls, and 16 is large and the aperture of the photographing lens is small with respect to the distance from the optical axis of the CCD line sensors Pa, Po2, Even if the exit pupil distance is
This means that the optical axis distance measuring light beams incident on the D-line sensors P o, P 02 pass through the aperture of the photographing lens TL.

In the present invention, which CCD line sensor Po is used as various lens-specific information as described later.

Whether P Ol and P O2 can be used without vignetting or not is determined by the RO in each lens as an AF availability signal.
It is stored in M.

FIG. 5 shows the aperture apertures of the aperture mask AM (A1°A2,
A 3 , A 4 , A , and A, ) and the back projection image A I of the condenser lenses LO, LO,, LO2
21 A 221 A :l 21A 42 , A
52 and A6. shows.

FIG. 5(a) shows the case of a lens with a large aperture. Because the aperture is large, all back-projected images can pass through the aperture for focus detection of the photographic lens TL, and the CCD
All of the distance measuring light beams incident on the line sensors Po, Pop, and Po2 can be used without being eclipsed by the pupil of the photographing lens TL. That is, focus detection can be performed in all the focus detection areas FallFallFal shown in FIG. 4 (see Table 1).

FIG. 5(b) shows the case of a lens with a small aperture, such as an interchangeable lens equipped with a teleconverter. Since the aperture is small, the only light beam that can enter the CCD line sensor without being eclipsed by the pupil of the photographing lens TL is the light beam for distance measurement on the optical axis, and the focus detection can be performed only with the fourth lens. This is only the focus detection area Fa in the figure.

FIG. 5(c) shows the case of a lens whose aperture position changes, such as a shift lens (here, a shift lens).
When the shift amount is 0, the focus detection area that is effective for focus detection is only Fa, but when the shift amount is X + , X 2
As it increases (0<X+<X2), the effective focus detection area also changes (see Table 1).

FIG. 5(d) shows the case of a lens with an irregularly shaped aperture, such as a reflective telephoto lens. The shaded area is the part where the light beam is vignetted due to the reflecting mirror (secondary mirror), and the light beam for distance measurement on the optical axis is CC
It cannot enter the D-line sensor Po, and it is impossible to perform focus detection in the focus detection area Fa.

On the other hand, in the reflective telephoto lens shown in FIG. 5(e), the part where the light beam is eclipsed by the reflecting mirror is small, so the light beam for distance measurement on the optical axis can be incident on the CCD line sensor Po.

As mentioned above, which focus detection area is valid during focus detection differs depending on the type of interchangeable lens, so it is stored in the ROM inside the lens as lens-specific information (AF availability signal). (see 1).

Margin Table 1 Table 1 shows usable focus detection areas (F al Fa, -F a2) and CCD line sensors (PG, PG, PO2) and AF availability signals depending on the type of lens. The focus detection area indicated by rOJ in Table 1 and the CCD line sensor arranged corresponding thereto can be used for focus detection. The AF enable/disable signal is 8-bit data.

FIG. 6 shows the relationship between the image plane best position and the stop position of the photographing lens under visible light and infrared light of a CCD line sensor (hereinafter referred to as AF sensor). The horizontal axis In the diagram showing distance, the position indicated as on-axis is the position where the imaging performance of the image formed by on-axis light (incident light parallel to the optical axis) is best. If it is placed in this position, the aberration performance against off-axis light (incident light tilted with respect to the optical axis) will deteriorate, and focus detection using the optical axis distance measuring light beam will result in a good defocus amount. You will no longer be able to obtain it. Therefore, considering on-axis light and off-axis light, the aberration curve shown as 6 images configured so that the film plane is located at a position slightly off-axis (best image plane position) is as follows. The amount of deviation caused by the light transmitted through the actual photographing lens (open aperture,
For example, F=2.0), indicating the position with the best image contrast.

On the other hand, as mentioned above, the AF sensor uses a light beam for distance measurement on the optical axis,
Alternatively, focus detection is performed using only the on-axis distance-measuring light flux, resulting in an effect equivalent to increasing the aperture value of the photographic lens, and the aberration performance on the AF sensor is the aberration of the entire photographic lens. Better than performance. The focus determination position by this AF sensor is shown as the AF sensor stop position under visible light or infrared light. Focus detection under infrared light means that when focus detection using visible light is not possible, infrared light is emitted from the auxiliary light circuit built into the camera body. This is the result. This auxiliary light circuit may be provided in a VC device outside the camera, for example, in an electronic flash device.

In this way, there is a shift between the AF sensor stop position and the image plane best position, and the amount of shift changes depending on the distance from the optical axis (image height). Therefore, in the present invention, the deviation amounts Δ5Bon and Δ5Boff shown in the figure.

Δ5bof r , ΔIRon, ΔIRoffrΔ1r
OFF is stored in the ROM inside the lens to perform correction to the best image plane position. The subscript ON is the correction amount for the focus detection area Fa that performs focus detection using the on-axis distance measurement light flux, and the subscript OFF is the correction amount for the focus detection area F that performs focus detection using the optical axis distance measurement light flux. a l %Fa2
Since the area F11++Fa2, which represents the amount of correction for the optical axis, is oriented at a symmetrical position with respect to the optical axis, it is possible to perform correction using the same correction data.

ΔSB is the amount of deviation between the defocus amount between the AF sensor stop position and the image plane best position under visible light, and Δ5bof
f is the difference between the AF sensor stop positions on the optical axis and off the optical axis under visible light. ΔIR is the amount of deviation between the AF sensor stop position under infrared light and the on-axis AF sensor stop position under visible light, and Δ1roff is the difference between the AF sensor stop position on the optical axis and off-axis under infrared light. This is a difference in position.

Since these deviations 11 (ΔSB, ΔIR) change depending on the zooming adjustment of the photographing lens by 7 focusing, the amount of deviation corresponding to the zooming or 7 focusing is stored in the ROM in the lens as a correction amount. However, the difference (Δ5) between the AF sensor stop positions on the optical axis and off the optical axis
bof r , Δ1roff) hardly changes even when zooming or focusing, so this difference can be stored in the ROM in the lens as a fixed value.

Here, follow the arrow in the figure to Δ5Bon.

It is assumed that Δ5Boff, ΔIRon, and ΔIRoff are positive correction amounts, and Δ5boff and Δ1roff are negative correction amounts.

In addition, correction jl(ΔSB.

If ΔIR) is to be made variable, have a distance encoder inside the lens, similar to the zoom encoder (61) in Figure 1, and specify the ROM address from the output of this encoder and the output of the decoder (62). do it.

The operation of the control CPU (100) in the camera body will be described below with reference to charts 70 in FIGS. 7 to 18.

FIG. 7 is a 70-chart showing the main routine of the operation program of the control CPU (100).

When the switch SWI, which is closed by pressing the release button to the first step, is closed, the program is started from step #700 (hereinafter steps will be omitted), and the program starts from step #702.
At this time, various flags as shown in Table 2 are reset to 0.

Table 2 describes the various seven lags used within the control CPU (100). A detailed explanation of each of the 117 lags will be given later.

Margin table 2 below #704 shows the first ROM after the control CPU is started.
Since we are reading data, set the read flag (Fl) to 1.
, and the process moves to #706, the lens data reading subroutine. As will be described later, in this lens data reading subroutine, reading of ROM data, identification of lens attachment/non-wearing, identification of lens generation, etc. are performed, and the process returns to the main routine.

Next, the process moves to #708, an automatic focus detection subroutine (hereinafter referred to as AF subroutine), and in this AF subroutine, as described later, the focus of the subject is detected and the lens is driven to bring it into focus.

In #710, the film sensitivity data of the film cartridge inserted in the camera is sent to the film sensitivity information circuit (
360) into the control CPU, and in #712, the photometry circuit (310) performs photometry of field brightness and A/D conversion to obtain brightness value data.

Based on the above data, perform a known exposure calculation (#714
), the obtained exposure-related values are sent to the display circuit (340) and displayed (#716).

Next, at $718, it is determined whether the switch SW1 is still on, and if the switch SW1 is off, the process moves to #726, all the displays on the display circuit (340) are turned off, and the data is read. The flag (Fl) is reset to 0 and the control CPU enters the sleep state.

If it is determined in #718 that the switch SWI is on, #7
At step 20, it is determined whether the switch SW2, which is closed by pressing the release button 2 with l1, is on. If the switch SW2 is on, a known release operation is performed at step #722. #724 after the release operation is finished
Wait until the switch SW1 is turned off, and proceed to #726. If the switch SW2 is turned off at #720, return to #706 and repeat the operation from reading the lens data once again.

FIG. 8 is a 70-chart showing the lens data reading subroutine of #706 in FIG.

First, check whether the read flag (Fl) is 1 or 0 in #802.
That is, it is determined whether the ROM data is to be read for the first time or for the second or later time after starting the CPU. If it is the first read, the process moves to #804, and if it is the second time or more, the process moves to #822.

Before explaining the reading operation, the lens information stored in the ROM within the lens will be explained with reference to FIG. Interchangeable lenses store lens-specific information necessary for exposure control, AF control, etc. as 8-bit digital data in each predetermined location of the ROM inside the lens. Information (conventional data) stored in the lens (hereinafter referred to as conventional lens)
By itself, the camera cannot control new functions.

In this regard, new lenses (hereinafter referred to as new lenses) have information that supports new functions in addition to conventional information! 1 (new data) may be installed. Figure 19 shows
It is a comparison diagram of ROM area maps of the conventional lens and the new lens.

Conventional lenses have lens information d1 to address 1 to i.
cli (conventional data) is stored, and the final 1
The 6th addresses i+1 to n-1 where the 11th top lens information dn (lens type identification data) is stored are empty addresses where no lens information is stored. The ROM installed in the new lens uses exactly the same capacity as the ROM of the conventional lens, and addresses 1 to i contain the conventional data d.
, ~di are stored as they are. In addition, the newly added lens information di+, ~dj (new data) is newly stored in the vacant addresses i+1 to j, and the lens type identification data dn is stored in the last address n, as in the case of conventional lenses. remembered.

In addition, in the present invention, what is defined as a conventional lens has a deviation amount between the image plane best position and the AF sensor stop position ( Δ5Bon, ΔrRon) are stored in the ROM in the lens as correction amounts (see a3).On the other hand, the new lens has focus detection areas Fal, F
Amount of deviation due to aberration (ΔI Roff, Δ5
Boff or Δ1rofr, Δ5boff) are newly stored.

Returning to FIG. 8, when the read flag (Fl) is 1 in #802, that is, the ROM of the first day after starting the control CPU.
The data loading operation will be explained. Since this is the first read, first, in #804, set the total number of ROM addresses n in the serial data counter (N) as the number of data to read, and in #806, according to the in-body read subroutine described later, select the current lens by zooming or 7 occursing. Read 1 byte of ROM data indicated by the status into the RAM stored in the body.

Since the first read is now complete, the read flag (Fl) is reset to O (I 808).

The first address of the ROM stores data called ICP, and the first 2 bits out of 8 bits are bit data for identifying whether a lens is attached or not, and the remaining 6 bits are bit data for identifying whether the lens is a conventional lens or a new lens. It consists of lens generation identification bit data indicating whether it is a lens. In $810, the first 2 bits of this ICP data are used to determine whether a lens is attached to the body or not, and if a lens is not attached, move to #836. to reset the lens flag (F3) to 0 indicating that the lens is not attached, and also reset the AF7 lag (AF
F) is set to 1 indicating that no AF operation is performed (#838), and the process returns.

When it is determined in #810 that a lens is attached, first in #812 a lens flag (
F3) is set to 1, and the process moves to step #814, lens generation identification. In #814, it is determined whether the attached lens is a conventional lens or a new lens using the remaining 6 bits of data of the ICP described above. If it is determined that the lens is a new lens, all necessary lens information has been stored in the RAM within the body, so the lens generation flag (F2) is reset to 0 for $816 and the process returns. If the lens generation flag (F2) is set to 1, it indicates that a conventional lens is attached, and if it is set to 0, it indicates that a new lens is attached.

When it is determined in #814 that the attached lens is a conventional lens, the lens generation flag (F2) is set and new data not stored in the conventional lens is stored in the in-body data table according to the in-body data table reference subroutine described later. is read into the RAM stored in the body (
$820), return.

When the read flag (Fl) is determined to be 0 in step 802, the control@CPU has already read the ROM data one or more times, so the lens generation flag (F2) is determined to be 0.
) to determine whether the lens is a conventional lens or a new lens (#822). If it is a new lens, use the serial data counter (
N) should be set to #824), and if it is a conventional lens, it should be set to RO.
Set the data number i of M in the serial data counter (N) (#826), and execute the in-body read subroutine similarly to #806 (#828). However, as mentioned above, j > i, and by specifying the number of data, R
We aim to shorten the time it takes to read OM data.

Similar to #810, #830 is a step to identify lens attachment based on the read ■CP data. If a lens is attached, the process moves to #832 and the lens flag (
F3), it is determined whether the lens was attached or not when the lens data was read last time. If the lens flag (F3) is 0, it means that the lens was not attached last time and a new lens is attached this time, so the lens flag (F3) is 0.
) is set to 1 representing the lens attachment state, and the process moves to #804, where n pieces of ROM data are read.

Figure 9 is Figure 8 #806. RAM in the body of #828
This is a subroutine for reading ROM data into RAM (RAM) in the camera body.

First, in #902, the ROM data storage start address la0 is set in the 7 address pointer (M) of the RAM. RAM
Similarly to ROM, the 0th order has an 8-bit configuration, #
At 904, the serial flag (F4) is reset to 0 to indicate that the ROM serial data reading process is incomplete, and the serial flag (F4) is reset to 8 so that the serial counter (120) in FIG. 2 counts 8 bits worth of clock pulses. Set (#906).

When the output terminal C8 shown in FIG. 2 is set low in #908, serial communication between the body and the lens becomes possible. #
910 is the serial port control register (SCK).
When C) is set to 1, a clock pulse starts to be output from the clock output terminal Sck shown in FIG. I912
is the step of waiting for serial interrupt processing to end, and waits for the serial interrupt to occur and the serial flag (F4) to become 1, that is, for 1 byte of serial data from the ROM to be read into the RAM. It is in a state of being

The serial interrupt processing operation will be explained based on FIG. When the serial counter (120) finishes counting eight clock pulses, it sends an interrupt signal (IN) to the control CPU.
T) is generated. That is, in #912 of FIG.
While U is waiting for the serial flag (F4) to become 1, the serial counter (120) finishes counting 8 clock pulses and generates an interrupt signal (INT), the flowchart is shown in t510. Move to. first#
At 1002, the serial port control register (SCKC) is reset to O in order to stop outputting clock pulses from the body side to the lens side.
At step 004, the 8 bits of data at the specified ROM address read in the serial data (121) is transferred to and stored in the address specified by the address pointer (M) in the RAM (initially "M"). In #1006, the address pointer (M) that specifies the RAM address of the storage destination is set to 1.
Next, in step 1008, the serial flag (F4) is set to 1 to indicate that the reading of 1 byte of serial data from the ROM into the RAM is completed, and the next ROM data is read. Serial counter (1
20) and enter 8 (#1010), Figure 9 #9
Return to 12.

At #912, it is determined that the serial flag (F4) is set to 1, so the 70-chart is set at #91.
4, and in #914 the serial data counter (N
) and reset the serial flag (F4) to O again (Nt915).

Judgment 70- in #916 is based on the serial data counter (N
) is determined whether all the ROM data corresponding to the number set in Set to high to end communication between the body and lens and return. If reading of all data is not completed, the process returns to #910 and the next ROM data is read.

Figure 11 shows the in-body data table reference subroutine of #820 in Figure 8. When a conventional lens is attached, the in-body data table is referenced for lens information (new data) that is not stored in the conventional lens. This shows the operation of storing the data in the RAM in the body.

FIG. 20 is an area map of the in-body data table. The last n address of the ROM in the lens contains the conventional lens,
Lens type identification data (mountain 1) is stored regardless of the new lens. Lens type identification data (cln) is
It has values from dn to dnc depending on the type of lens. The in-body data table shows the lens F of the conventional lens.
Data (cli+1 to dj) corresponding to new data newly stored in the new lens are stored in accordance with the ti types.

Returning to FIG. 11, first in #1102, the control CPU
The lens type identification data (dn) is received from the li RAM. The receiver should set the data table area number k in the body to the counter (K) based on the received dn=dnk (1≦≦1), and set the data table area number k in the body to the serial data counter (N) from the data table in the body. (#1106) L, and the address pointer (M) of the RAM contains the start address of the lens ROM data storage. Set 10i (#1108). RAM ring. ~ Theory. Conventional data already stored in the ROM is stored at address +i-1.

In #1110, 1 byte of data corresponding to the lens type Bn data (dnk) is referenced from the in-body data table and stored in the RAM address specified by the address pointer (M). After that, as in the case of the lens data reading subroutine, the data from the in-body data table to dj is referenced one byte at a time and stored in the RAM.

Table 3 shows what kind of lens information is stored in the RAM stored in the body, limited to the data used in the embodiment, and the addresses are given for convenience. As already explained in detail, in terms of correspondence with the lens side, the ROM of conventional lenses has at least one memory in the RAM.
The lens information of addresses 1 to 5 and n in the RAM of the new lens is stored in the ROM of the new lens. i+1 to i+4. and lens information of addresses n are stored, respectively. In the conventional lens, lens information corresponding to the contents of i+1 to i+4 depending on the type of lens is read from the in-body data table and stored in the in-body RAM.

The symbol (variable) indicates that the data is variable data that changes by zooming or 7-focusing. The conversion coefficient is the amount of lens drive divided by the amount of defocus, and is used to calculate the amount of lens drive necessary for focusing from the amount of defocus for lens control obtained by the non-point detection movement described later. . If the lens is not a shift lens, the shift amount of the shift lens is fixed to zero.

Below is a margin table 3. Figure f512 is a flowchart showing the AF subroutine of #708 in Figure 7.

At $1202, the state of the AF7 lag (AFF) is determined. AF7 lug (AFF) is #8 in Figure 8.
This flag is set to 1 when the lens is not attached in #10 or #830, or after the lens is in focus as described later. In other words, if the AF7 lag (AFF) is set to 1, either the focus is already in place or the lens is not attached, so the focus detection operation is not performed and the process returns (#1246). .

When the AF7 lag (AFF) is 0, the state of the auxiliary light 7 lag (F5) is determined in well 1204, and the auxiliary light 7 lag (F5) is
If is set to 1, the process moves to focus detection operation using auxiliary light (@1218 to #1232).

If the auxiliary light and flag (F5) are O in #1204, @
At 1206, each AF sensor <CCO line sensor) P 0
Integration at 1 P o, , P 02 is performed by a known method, and the integrated data is dumped (#1208).

#1210 is a subroutine for focus detection calculation using the above integral data, which will be explained using FIG. Well 13
02 is each focus detection area Fa, Fal.

This is a focus detection calculation for each fax. Each AF sensor Po
Two light-receiving element rows, a reference part and a standard part, are formed in each of yPo+*POz, and in focus detection calculations, signals from these light-receiving element rows are used to calculate the object's image contrast, correlation calculation, etc. This process creates data necessary for focus detection, such as data related to the amount of defocus and data indicating the reliability of focus detection. For more detailed control, the present applicant has disclosed, for example, Japanese Unexamined Patent Application Publication No. 1986-
The method filed in Japanese Patent No. 4914 may be used. The results obtained by this focus detection calculation are used to determine whether focus detection is possible in each focus detection area and to calculate the amount of defocus, as will be described later.

1304, various low contrast flags (LCF).

LCFI, LCF2. LCF3) respectively. The low contrast flag is a flag that indicates whether focus detection is possible or impossible based on the result of focus detection calculation. 1 indicates that focus detection is impossible, and 0 indicates that focus detection is possible. The AF enable/disable signal stored in the ROM in the lens is a signal that specifies a focus detection area that can be used depending on the shape of the lens, regardless of the result of the focus detection calculation.

In 91306, based on the result of the focus detection calculation for the AF sensor Po arranged corresponding to the focus detection area Fa, it is determined whether focus detection is possible in the focus detection area Fa, and focus detection is performed. If possible, leave it as is.
If focus detection is not possible, set the loaf flag (LCFl) for area Fa+ to 1 in step 1308 for $131.
Transition to 0.

#1310 to 131G are similarly focus detection areas F a
, F a2 is a flow of determining whether focus detection is possible or not.

Next, in #1318, the AF enable/disable signal is received among the lens information stored in the RAM in the body, and if the data is (OOH), it goes to $1320.If it is (0IH), it goes to #133.
0, (02H) to #1336, (03H) to [
344, and (04H) to #1350 (see Table 1). In each 70-, in the focus detection area specified by the AF availability signal, it is determined whether focus detection is possible or not by referring to the low contrast flag for that area, and if the focus detection calculation specified by the AF availability signal is performed. If focus detection by focus detection calculation is impossible in all cases, the low contrast flag (LCF) is set to 1 and the process returns. On the other hand, if there is even one focus detectable area, it returns 0 as is, for example,
If (02H) is received as the AF availability signal, #
Transition from 1318 to well 1336. AP availability signal (0
2H) specifies Fa and Fa2 as the focus detection areas, so it is determined whether or not focus detection by focus detection calculation is possible based on the low contrast flags (LCF2) and (LCF3). #1338, low contrast 7 lag (LCF”2) is 0
If it is determined that this is the case, it means that focus detection is possible at least in the focus detection area Fa, and the process returns directly. Loaf flag is #1338 (LCF2)
is 1, low contrast flag (LCF) is set in #1340.
If 3) is O, focus detection is possible at least in the focus detection area Fa2, so the process returns. If both low contrast flags are 1, it means that focus detection is possible over the entire area, so the low contrast flag (LCF
) to 1 and then return. The same holds true when receiving the AF enable/disable signal from the camera.

Returning to FIG. 12, #1212 is 70- for determining whether or not focus detection is possible over the entire area based on the low contrast flag (LCF) determined in the focus detection calculation subroutine described above; if the low contrast flag (LCF) is 1, then , since focus detection cannot be performed in the entire area, #1216
After setting the auxiliary light 7 lag (F5) to 1, $121
Shifts to focus and ζ detection operation using auxiliary light from 8 onwards. Focus detection calculations often determine that focus detection is impossible because the contrast of the subject is extremely low or the brightness of the subject is extremely low. The auxiliary light built into the body is emitted and the light received by the AF sensor is integrated. #1226. Focus detection calculation of well 1228 and low contrast brag (L C
F ) is used to determine whether focus detection is possible or not based on the above-mentioned well 1210.
．． This is the same as #1212. If focus detection is not possible even with the light reception integral obtained by emitting the auxiliary light, a warning is displayed on the display circuit (340) in #1232 that focus and α detection is not possible, and the AF7 lag (A F F ) is Set to 1 and return ($1240.#1246).

#1214 or #1 according to FIGS. 14 to 17
The defocus amount calculation subroutine 1230 will be explained.

FIG. 14 is an example of the subroutine #1214 of defocus 1 performance K(A) under visible light.

#1402 to #1406 indicate defocus amount calculation in the focus detection area Fal. At $1402, the state of the low contrast flag (LCFI) corresponding to the focus detection area Fal is determined, and if the flag (LCFI) is 1, the area Fa,
Since it is impossible to perform focus detection, that is, calculation of the defocus amount, the process moves to #1408. In #1404, the defocus amount (ΔI:1) is calculated based on the result of the focus detection calculation. As explained using FIG. 6, there is a certain deviation between the image plane best position, which is the actual film surface, and the AF sensor stop position based on focus detection by the AF sensor. Therefore, based on the output of the AF sensor (the defocus amount (Δξ1) obtained from the focus detection calculation result cannot accurately indicate the best position of the image plane.
At step 06, a correction calculation is performed to focus on the best position on the image plane. That is, the following calculation Δξ1°=Δξ1+Δ5Bon +Δ5boff −(1
) is used for correction. Here, Δ5Bon is conventional data and is variable data due to zooming or 7-occursing, and Δ5boff is new data and is fixed data that does not change due to zooming or 7-occursing.

Similarly, $1408 to [412 are the calculation flow of the defocus amount in the focus detection area Fa, and the defocus amount (Δξ2) obtained based on the result of the focus detection calculation is corrected by the following calculation. .

Δξ2゛=Δξ2+Δ5Bon - (2) That is, since the focus detection area Faj is focus detection using the light beam for the upper distance of the optical sleeve, correction is performed using only the conventional data Δ5Bon, and of course Δ5Bon is variable data.

1414 to #1418 are calculations 70- of the defocus amount in the focus detection area Fa2, and the correction calculation is (1
) is the same as the formula, and becomes as follows.

Δξ3゛ = Δξ3 + Δ5Bon + Δ5boH - (3) The feature of this subroutine is that it uses the on-axis variable data Δ5Bon, which is stored as conventional data in the ROM of conventional lenses, to calculate the differential amount under visible light. The point is that new off-axis variable data is created.
For this purpose, the only new data (new data) that needs to be stored is the fixed data Δ5bof f.Furthermore, the focus detection areas Fa1 and Fa2 are based on the light beam that has passed through an area that is almost symmetrical with respect to the optical axis of the lens. Since focus detection is performed,
It is sufficient to store only one correction amount (Δ5boff) used for the correction calculation.

Figure 15 shows defocus 1 using #1230 auxiliary light.
This is an example of the Performance W(A) subroutine, and, like the defocus amount correction and calculation under visible light in Fig. 14, new variable data is created using fixed data of new data and variable data of conventional data. is creating. Since the flow of the 70-chart is exactly the same as that of the fpJ14 diagram, only the correction calculation will be explained.

When performing focus detection by projecting infrared light onto the subject as auxiliary light and receiving the infrared light reflected from the subject,
Due to the chromatic aberration of the lens, a different correction is required in addition to the correction of the amount of defocus when detecting focus under visible light (
(see Figure 6), the defocus amount (Δ
The correction of ξ2) is performed by the following equation.

Δ ξ 2 = Δ(2+Δ5Bon+(aX Δ I
Ron10b) (4) Here, ΔrRon is conventional data, and is variable data by zooming or focusing. a
is a correction coefficient indicating the ratio of the correction amount ΔIRon' at the infrared wavelength of the auxiliary light used in this embodiment and the correction amount ΔIRon when using the infrared light of the wave vc800n theory. The correction amount ΔIRon stored as lens information for both the conventional lens and the new lens is a wavelength of 800 n+a.
Since this is the amount of correction, if auxiliary light having a wavelength other than 800 nm is projected, a correction commensurate with the wavelength is required. ΔIRon' and ΔIRon as correction coefficient a
The reason for this ratio is that the chromatic aberration of the photographing lens changes linearly in the infrared wavelength range, and this ratio does not change much even when zooming or focusing. b
is the infrared light characteristic at the used infrared wavelength of the auto 7 orcus sensor module (dotted line in Figure 3, block AF portion) used in this example, that is, the ΔIR correction value of the auto 7 orcus sensor module. be. The correction coefficients or correction values for a and b are stored in the E2PROM in the body.

On the other hand, the focus detection area F using the light beam for pressure outside the optical axis
The defocus amount (denoted as Δξ) obtained by n or Fa2 is corrected by the following formula.

Δξ゛=Δξ×Δ5Bon+ (aXΔI Ron+b×Δ1roff) −(5)Δ
1roff is new data and is fixed data that does not change due to zooming or 7-orcasing. The data to be stored as new data is fixed data Δ1rof
Just f is enough.

Figure 16 shows defocusing W(B) under visible light.
) is a subroutine, which is another embodiment of FIG.

For correction in the focus detection areas F Ml and F a2, variable data Δ5Boff is stored in advance by zooming or 7-focusing as new data, without using variable conventional data (Δ5Bon). do. That is, the focus detection area Fa+
Alternatively, the defocus amount (denoted as Δξ) obtained by Fa2 is corrected as follows.

Δξ゛=Δξ+Δ5Boff - (6) Regarding the focus detection area Fa, on-axis correction data Δ5Bon
This is the same as equation (2) using .

The capacity of the ROM for storing new data naturally increases by the amount that changes due to zooming or focusing, but the difference between the on-axis and off-axis AF sensor stop positions is Δ5b.
This is effective for lenses whose OFF changes significantly due to zooming or focusing.

Figure 17 shows defocusing using an auxiliary light (B).
This is a subroutine and is another embodiment of FIG. 15. Similar to FIG. 16, data ΔI Roff, which can be changed by zooming or focusing, is stored in the ROM in the lens as new data. Therefore, focus detection area Fa
, or correction of the defocus amount (denoted as Δξ) obtained by Fax is performed as follows.

Δξ1=Δξ+Δ5Bon+ (aXΔI Roff+b) −(7) Regarding the focus detection area Fa, on-axis correction data Δ5Bon, ΔIRo
This is the same as equation (4) using n.

Returning to FIG. 12, #1234 is a lens control that calculates the amount of lens control defrost scum needed for lens drive from the defocus amounts of the plurality of focus detection areas obtained in #1214 or #1230 above. This is a subroutine for calculating defocus amount.

In $1236, it is determined whether the current lens position is in focus based on the calculated control defocus amount, and if it is in focus, the display circuit (34
0) to indicate the in-focus state, and the process moves to #1240. If it is not in focus, calculate the necessary lens drive amount using the control defocus amount obtained by the control defocus amount calculation and the conversion coefficient stored in the ROM.
1242), drive the lens (#1244), $12
The focus display of 38 moves to 70-.

FIG. 18 shows the control defocus amount calculation subroutine #1234 in FIG. 12 in detail. first,#
At 1802, a ΔF enable/disable signal is received from among the lens information stored in the RAM in the body, and the process moves to each step 70- according to the data. For example, if the AF availability signal is (OOH), Δξ=r(Δ
The defocus amount for lens control is calculated by (1', Δξ2゛, Δξ3゛). The function f selects only an effective defocus amount from the defocus amounts Δξ1°, Δξ2゛, and Δξ3゛ of a plurality of focus detection areas, and calculates the defocus amount for lens control according to a predetermined evaluation algorithm. I won't go into details as it has nothing to do with the main point.

When the AF enable/disable signal is (OIH), the defocus amount detected in the focus detection area Fa in #1810 is directly used as the defocus amount for lens control. When the AF availability signal is (02H), (03H), and (04H), the lens control defocus amount is calculated according to each flow. The details are described in, for example, Japanese Patent Laid-Open No. 61-55618, which has already been filed by the present applicant.

(Effects of the Invention) As is clear from the detailed description above, compared to the first lens (conventional lens) that does not have the second lens data (new data) necessary to perform the second function, In this case, the storage means in the camera body has second lens data for each type, the type identification data (lens type identification data) specifies the second lens data specific to the lens, and the second function is controlled.

In addition, a camera body that can perform the second function only needs to store the second lens data necessary for the first lens group, and there is no need to store a huge amount of data within the camera body. do not have.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall circuit configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of input/output terminals of a control CPU, and FIG. 3 is a focus detection optical system in an embodiment of the present invention. A schematic diagram of the device; Figure 4 is an internal view of the finder showing the focus detection area of the subject; Figure 5 is a back projection of the aperture mask on the pupil plane of various interchangeable lenses; Figure 6 is the focus detection area by the AF sensor. A diagram showing the relationship between the focal position and the best image plane position based on the aberration of the photographic lens, Figure 7 is a flowchart showing the main operation of the control mcPU, Figure 8 is a flowchart showing the ROM data reading subroutine, and Figure 9 is a flowchart showing the main operation of the control mcPU. RAM inside
Flowchart showing the loading subroutine to
0 is a flowchart showing a serial interrupt processing routine to the control CPU, FIG. 11 is a flowchart showing an in-body data table reference subroutine, FIG. 12 is a flowchart showing an automatic focus detection subroutine, and FIG.
The figure is a flowchart showing the focus detection calculation subroutine.
Fig. 14 is a flowchart showing an example of the defocus amount calculation subroutine under visible light, Fig. 15 is a flowchart showing an example of the defocus amount calculation subroutine using auxiliary light, and Fig. 16 is under visible light. FIG. 17 is a flowchart showing another embodiment of the defocus amount calculation subroutine using auxiliary light, and FIG. 18 is a flowchart showing another example of the defocus amount calculation subroutine using auxiliary light. A flowchart showing the calculation subroutine, Fig. 19 shows the RO in the lens.
The area map of M, FIG. 20, is the area map of the data table in the body. Applicant: Minolta Camera Co., Ltd. Figure 12 n Yamataka Urn U) Figure 5 (fa) Figure 6 JISq Figure 1I Figure 74

Claims (1)

[Claims] (1) In a camera system that can selectively use a large number of interchangeable lenses, the interchangeable lens has lens group identification data indicating that it belongs to a first lens group among predetermined first and second lens groups. , a first lens group storing type discrimination data indicating the type of lens, and first lens data unique to the lens necessary for the camera system to perform a predetermined first function; and the above two lenses. lens group identification data indicating that the camera system belongs to the second lens group; first lens data specific to the lens necessary for the camera system to perform a predetermined first function; The camera body has a second lens group that stores lens-specific second lens data necessary to perform a new second function that is not included in the function of the first lens group. A storage means that stores second lens data necessary for the camera system to perform the second function according to the type of each lens, and a storage means that stores the second lens data necessary for the camera system to perform the second function, and a storage means that stores the second lens data necessary for the camera system to perform the second function, and a storage means that stores the second lens data necessary for the camera system to perform the second function, a determining means for determining whether the lens belongs to a lens group; and a first lens data stored in the lens when it is determined that a lens of the first lens group is attached based on the determination result of the determining means; When the lens type discrimination data specifies the type according to the second lens data stored in the storage means in the camera body, and a predetermined control is performed, and it is determined that a lens of the second lens group is attached. A camera system comprising: a control means for performing predetermined control based on first and second lens data stored in the lens.