JPS59126522A - Intermediate accessory for camera - Google Patents

Abstract

PURPOSE:To secure accurate information transferring by connecting electrically an electric member which has an electric physical quantity corresponding to a peculiar optical physical quantity to the detecting circuit of a camera body through electric contacts. CONSTITUTION:A front mount part 6a and a rear mount part 6b are provided to the front and rear part of an intermediate accessory 6 respectively, and the 1st electric contacts e19 and e20 and the 2nd electric contact e21 are connected electrically to the electric contacts e9, e10, and e23 of the camera body coupled with the rear mount part 6b. Then, the electric member Rt1 has the electric physical quantity corresponding to the optical physical quantity characteristic to the intermediate accessory 6 and is connected between the 1st electric contacts e19 and e20, and the 2nd electric contact e21.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to intermediate accessories such as rear converters, intermediate rings, and bellows that are interposed between a camera body and an interchangeable lens.

Conventional technology When a rear converter is installed between a camera body and an interchangeable lens, the effective F-number (aperture value) of the entire combination of the interchangeable lens and rear converter is different from the F-number set by the aperture setting section of the interchangeable lens. will have different values. Therefore, since the effective F value can only be detected on the camera body side, it has been impossible to set the effective F value and display the effective F value using an aperture setting means provided in the camera body.

Conventionally, in the above-mentioned case, a rear contourer has been proposed that corrects the set F value of the interchangeable lens and transmits the effective F value to the camera2.
There are 1. The rear converter is installed between an interchangeable lens that has a signal member positioned according to the f-number and a camera body that has a detection member that comes into contact with the signal member and detects the position of the signal member. A slide member for transmitting the position to the detection member is formed so as to transmit to the detection member the position after a correction amount corresponding to the F value changed by the rear converter from the position of the signal member. However, with this F-value adjustment mechanism using the sliding member of the rear converter, errors occur due to misalignment of the coupling between the rear converter and the camera body, and misalignment of the coupling between the rear converter and the interchangeable lens. do.

Further, in this rear converter, there is a space restriction on the maximum amount of movement of the detection member of the camera body, so there is a limit to the amount of information that can be obtained by dividing the amount of movement.

Further, in a rear converter installed between a camera body having two electric switches and an interchangeable lens having a signal means that transmits the minimum aperture F value by turning the electric switches ON and OFF, the signal means is turned ON,
01; Tell the F function as is and turn it on.

It is known to have a correction transmission means that turns off the electric switch and also turns off the other electric switch.

However, in this configuration, two switches are ON and OFF.
Since it is only a combination of
Furthermore, when a plurality of rear converters are connected, the correct F value cannot be transmitted.

The problem of a difference between the set F value and the effective F value of an interchangeable lens also occurs when an intermediate link, bellows, etc. is attached between the interchangeable lens and the camera body. In other words, when an intermediate link etc. is installed, the aperture of the interchangeable lens is extended, so the effective F
The value becomes large.

Furthermore, separately from this, there is provided a camera body having a drive motor driven based on a signal from the focus detection means and a drive force output member driven by this motor, and a drive output section of this camera body. The following disadvantages also occur in an autofocus rear converter that is coupled with an interchangeable lens having a driven member that drives a focusing optical system for focusing.

For example, in order to effectively utilize the phase difference method that can detect not only the direction of so-called out-of-focus but also its amount (the direction of deviation of the image point from the intended image formation plane and the flame) in the autofocus system of an interchangeable lens camera, it is necessary to detect The camera body must understand how long the driving force output member on the camera body side should be driven in response to the amount of out-of-focus. In other words, the amount of drive of the driving force output member depends on factors such as the ratio of the focusing optical system extension amount to the amount of defocus in the interchangeable lens, the lead of the focusing optical system extension mechanism such as a helicoid screw, and the reduction ratio of the drive transmission system. It is determined by the type of interchangeable lens (this is specific to each type of lens (however, with lenses such as zoom lenses with a moving front group focusing method, the ratio of the amount of focusing optical system extension to the amount of out-of-focus due to zooming) ).As a countermeasure for this, in interchangeable lens cameras that use a variety of interchangeable lenses, these elements are given to each interchangeable lens as signals, and when the interchangeable lens is attached to the camera body, it is sometimes The driving amount of the driving force output member can be controlled by introducing it into the camera body, or the driving amount of the driving force output member on the camera body side can be adjusted individually regardless of which interchangeable lens is attached. It is conceivable to change the lead of the focusing optical system feeding mechanism and the reduction ratio of the driving force transmission system on the interchangeable lens side so that they are common to all interchangeable lenses.However, it is possible to change the rear converter between the interchangeable lens and the camera body. When interposed between the lenses, the overall focal length of the photographic optical system changes from the focal length of the interchangeable lens alone to the combined focal length of the interchangeable lens and rear converter (this changes the amount of out-of-focus from that combined focal length). However, focusing still has to be performed only by extending the focusing optical system of the interchangeable lens, so the difference between the change in the image point on the camera body and the amount of extension of the focusing optical system on the interchangeable lens This is true no matter which of the above countermeasures are taken, and if these countermeasures are significantly disrupted, a situation may arise in which it becomes difficult or impossible to focus.

Objective: The present invention provides an intermediate accessory interposed between an interchangeable lens and a camera body, in which a physical quantity of a photographing optical system that is changed by attachment of an intermediate accessory can be detected on the camera body side. The purpose is to provide intermediate accessories.

Summary The intermediate accessory of the present invention is characterized in that an electrical system having an electrical physical quantity corresponding to an optical physical quantity unique to the intermediate accessory is provided so as to be detectable on the camera body side.

Example (In the rear converter, the intermediate accessory of the present invention transmits its magnification information to the intermediate ring and iJ.
Here, information on the amount of movement of the photographing optical system is indicated by the number of a resistor or capacitor having a resistance value or capacitance corresponding to the information. Also, in the embodiments, When a plurality of intermediate accessories are connected, the resistor or capacitor is connected in parallel so that the magnification or the amount of extension of the entire connected intermediate accessories is transmitted to the camera body. There is.

Example The present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of a rear converter capable of transmitting information about double magnification to a camera body using electrical resistance.

Remove the camera mount part (2a) of the interchangeable lens (2) and obtain information about the interchangeable lens (2), such as the aperture 1.' value, the number of aperture steps, the amount of helicoid extension, and the focal length FI.
In order to electrically transmit information such as 411, interchangeable lenses (
Electrical contact (el) connected to the information circuit (3) in 2)
, (c2), (e3), (e4) and (e5) are arranged. On the other hand, the lens mount part (4a) of the camera body (4) has electrical contacts (e6 ), (e7), (e8
), (e9) and (e to ) are provided. Among these, the electric contact (e9) is connected to the constant voltage power supply (Vcc)
The electrical contact (exo) is connected to earth.

When the rear converter (6) is installed between the sill body (4) and the interchangeable lens (2), the lens mount part (6a) of the rear converter is contacted with each electrical contact of the interchangeable lens (2). ) electrical contacts arranged inside (ell) , (el2) , (el3) , (
es4) and (el5), and the inside of the camera mount part (6b) of the rear converter (the electrical contacts arranged in this manner (el6
), (el7), (el8), (el9)
and (ezo), and the electrical contact (ett
), (el2) (el3), (C14) and (el5
) are electrical contacts (el6), (el7), (e
18), (el9), and (ezo)i are directly electrically connected, so that an electrical signal transmitted to one electrical contact is directly transmitted to the other electrical contact.

In this embodiment, the interchangeable lens (2) and the camera body (4) are connected by five electrical contacts, or the number of such electrical contacts is transmitted to the rear lens (6). , electrical contacts (C21) and (C22) for transmitting the magnification thereof are provided in a state where they are directly electrically connected to each other.

As shown in Figure 2, when one rear converter (6) is attached, the electrical contact (C21) located inside the camera mount part (6b) is the electrical contact provided on the camera body (4). (ez3) and the electrical contacts (ezz) arranged inside the lens mount part (6a) are connected to the insulating plate (5) that supports each electrical contact of the interchangeable lens (2).
It is kept insulated from each electrical contact simply by touching it. If it is a rear converter or a teleconverter with a magnification greater than 1, the electrical contacts (C14) and (etc.
) and the electrical contacts (C21) and (C22),
An electrical resistance (Lt+,) having a predetermined resistance value is provided. As shown in Table 1, the resistance value of this resistor (Rtt) is set to a value inversely proportional to the logarithm of the magnification of the teleconverter (6). For example, when the magnification is 1.4 times (L times), Ro(
Ω), 2 times ((stone-) 2 times) -RO(Ω), 2.
8 times (F) 3 times), it is Ro, and when multiple such teleconverters are connected in Table 1, the camera mount part number of the front teleconverter should be connected to each electrical contact such as (c+r+), (C17).

(ez8), (ets), (e2o), (czt) are
The electrical contacts (c++), (et2), (c
+3), (ez), (ets).

(ezz) (This is electrically connected.

FIG. 3 shows the connection state of the electrical contacts related to the transmission of magnification information when the interchangeable lens (2) and camera body (41) are separated. That is, each teleconverter (Tl), (T2) ,... (=l'n) resistance (Rt +) , (Rt 2) ,..., (艮[
■1) are connected in parallel. Now, let us calculate the concealment rate of each teleconverter ('I'l), (T2), ... (rn) as (F) old, (Jv) 2,...,(J'
)”' (!: Then, the resistance (Rtt), (R(2)
, -= (Rtn) each resistance value is -Ro -Ro, ・
...-1(o(Ω)).

Mt ' M2 ' Mn If the combined resistance value of those resistors is 1 (χ (Ω)), then to detect the resistance value Rx, the teleconverter (TL), (1'
2), ... and (Tn) +7) Overall magnification (Eν) (M1+M2+°°゛°°+Mn) camera angle.

In FIG. 3, the camera body (4) is provided with a detection circuit (8) for detecting the combined resistance value. The detection circuit (8) consists of a constant voltage power supply σcc), a resistor (1) and (tt2) connected in series between the ground contact
) and resistances (R3) and (R4), with resistances (1<
t)! There is an electrical contact (C2) at the connection point of 4-way (R2).
3) and the negative input terminal of the differential amplifier (A1) are connected, and the positive input terminal of the differential amplifier (A1) is connected to the connection point of the resistors (R3) and (R4). Resistance-
(R5) is connected between the output terminal and negative input terminal of the differential amplifier (A1) to form a negative feedback circuit. Note that the resistors (R1) and (R2) have similar resistance values to each other,
Moreover, its resistance value is sufficiently larger than Ro, and the resistance value (R
3) and (l(-4)) have mutually equal resistance values.

The power supply voltage of this detection circuit (8) is vcc, the resistor (R5
) is the resistance value r5, and the output voltage of the output terminal of the differential amplifier (A1) is 0, then the following equation is obtained. Therefore, for example, two pre-converters are installed between the interchangeable lens (2) and the camera body (4), and their magnifications are 14x (8x) and 2x ((7T) 2x), respectively. , then Vcc 3rs vo = −+ 1−−(1+2 ) )=−(1−−
)2 Ro 2
It becomes 0.

If this detection circuit (8) is used, even if the magnification of the rear converter is smaller than 1, that is, in the case of a wide converter, it can be connected to the electrical contact (C21) of the wide converter (Wn) to transmit information about the magnification. Then, the resistance of each wide converter (Rwl), (RWz),...
- (Rwn) are connected in parallel with each other.

Now, each wide converter (Wl'), (W2),...
・I・Vn) are respectively C(r)−old and (J
-)→2,...(J)-Mn, then the resistance (Rw
l) , (ltw2), 1 --- (Rwn) 0) Each resistance value is -Ro, -Ro,
-----R.

If the combined resistance value of those resistances is expressed as Iζx by M t M2 λin, then 1 121 (M+10 to 12+...→-M1]) Rx R
.

becomes. At this point, the output voltage of the detection circuit (8) is \'
cc Vccl's V ec r5V
o=-+ = (1+ (!vl++fV1
2+...-M+1))2 2RX 2 R.

becomes.

Note that in the above configuration (in this case, even when a teleconverter and a wide converter are connected, information on their combined magnification can be transmitted. For example, 2x ((jJT) 2x) and 2, When an 8x ((σ) 3x) teleconverter and a 0.7x (ha) - 1x) wide converter are connected, Vec rs
Vcc 4r5VO--(1--(2+3~1
) )−−+ 1−− )'l Ro
2R.

Therefore, it is detected that it is 4 times ((JT)' times). Note that when the magnification is 1, no resistor may be provided. In addition, in this way, the electrical contact (C15), (
If ezo) and (ero) are connected to ground,
Instead of the electrical contacts (C15), (ezo), (ezo), a mount made of a conductive material may be used.

・Figures 5 and 6 show an example of a rear converter that transmits magnification information using a capacitor (Xl),
(X2), -... (Xn), between each electrical contact (e3t) and (C32) and (C33) and (C34),
respectively, capacitors (Cc 1), CCC2), -,
-(Ccn) is provided. Rear converter (χ1
), (X2)...(Xn) are connected, capacitor (Ccl), (C; cz ), ---(
Ccn) are connected in parallel with each other. Each capacitor (
The capacities of CCV), (CC2), ... (Ccn) are
For example, Table 2 (as shown, 14' times (, /T times)
Co(PF) when , 2CO(PF) when 2 times ((,ff) 2 times), 3Co when 28 times ((σ) 3 times)
(P F ), and when (you-)M times 4Co(
PF).

(Left below) Table 2 Now, each rear converter (Xl), (X2),...(
The magnification of Xn), (ζ) M I, (stone-
) M2,..., (r)'', the capacitances of the capacitors (CCV), (CC2) ---, (Ccn) are MICo, M2C,o, ---MnC.

(' I) F ), and the combined capacitance of those capacitors is Cx (P F ), which is Cx = GO, (Ml-1-M2+...-1-Mn)
Therefore, when Cx is detected, the rear converter (xl),
Overall magnification (6-) of (X2), ... and (Xn)
M 1 +M 2 ″(−″ 10 anus is required.

The rear converter electrical contacts (
Electric contacts (C35) and (C36) connected to C31) and (C32), respectively, and a detection circuit (12) for detecting the combined capacitance Cx are provided.

The detection circuit (12) includes a resistor (R6), (l support 7), (R
8), (Technique 9), (ltlQ), a constant current circuit composed of a differential amplifier (A2) and a transistor (Trl) and connected to its output terminal power ≦ electrical contact (C35), and a resistor ( 11), (R12) and differential amplifier (A
3) consists of a first charging voltage detection circuit connected to the input terminal or electric contact (C35), and the collector and emitter, respectively, connected to the electric contact (C35) and (C36);
) connected to a switching transistor (Trl) and a resistor (it
13) and a reset circuit (13) connected to a resistor (13).

As shown in Fig. 6 (ta), the reset node circuit (13) operates and raises the base voltage of the transistor (Trz) to
By changing from h to Low, the transistor (Trl
) is switched from a conducting state to a non-conducting state,
Each capacitor (CC1), (CC2),..., (Cc
n) is charged by a constant current from a constant current circuit, and the sixth
As shown in Figure fbl, the charging voltage (Vx) rises to a predetermined voltage vb determined by the resistors (R1l) and (R12).
The output of the differential amplifier (A3) is determined by the time τ until the output of the differential amplifier (A3) changes from I-1high to Low as shown in FIG. □ I.

becomes. For example, the time τ is converted into a digital signal by a circuit that generates a reference/curse during this time and a pulse counter that detects the number of pulses output from that circuit, and is input to an arithmetic circuit in the camera body. Ru.

According to each of the above-described embodiments, the information about the magnification of the rear converter transmitted to the camera body can be used for various operations within the camera body.

For example, when a rear converter is installed between an interchangeable lens and a camera body, the effective F-number of the entire combination of the interchangeable lens and rear converter is determined by the magnification factor relative to the F-number set by the aperture setting section of the interchangeable lens. ] - increases by one stop each time it is multiplied (i.e., the same way the aperture is stopped down, so the amount of light to the camera body, e.g.
In Fig. 2, electrical contacts (el), (elt), (eI
Information on the F value preset by the aperture setting section of the interchangeable lens is transmitted to the exposure calculation circuit (14) via electrical contacts (C19) and (C6).
9), (C21) and (ez3), and the detection circuit (8) outputs a voltage signal according to the information. The item a) is the A-D converter (1
6), the signal is converted into a digital signal, inputted to the exposure calculation circuit (14), and then stored in the camera body to calculate the effective F.
Value can be detected. This makes it possible to display the effective F value, and also uses the drive mechanism inside the camera body and the drive force transmission mechanism provided in the rear converter to drive the aperture setting section of the interchangeable lens to display the effective F value. It is possible to perform automatic settings.

In addition, the drive force of the autofocus drive member of the camera body equipped with a phase-difference focus detection means is transferred to the driven shaft connected to the focusing optical system of the interchangeable lens. In a rear converter/computer equipped with a rear converter, accurate autofocusing can be performed by transmitting information about the magnification of the rear converter to the camera body.In other words, the rotation speed of the driven part of the drive transmission shaft of the rear converter and the amount of defocus can be The ratio KMC is the rotation amount and defocus amount of the driven shaft of the interchangeable lens, KM is the lead of the helicoid screw connected to the focusing optical system, and the gear ratio of the drive transmission system from the driven shaft of the interchangeable lens to the helicoid screw is 1M. μM, and if the magnification of the rear converter is m, then By transmitting information to 7. The camera body (here, the composite focal length of the entire combination of rear converter and interchangeable lens is detected,
The composite focal length can be displayed within the camera body. In addition, if the shutter speed is lower than a predetermined level, [in a camera body equipped with a camera shake warning device that issues this warning, the level of the shutter speed that issues a camera shake warning is automatically changed according to the information on the composite focal length, You can also use composite focal points, long distances, and fast shutter speeds to provide camera shake warning. In addition, when information about the effective l value of the rear convergence and the interchangeable lens, the combined focal length, and the shooting setting side division of the interchangeable lens is given, and the allowable diameter of the irregular circle is set, the field of view within the camera body is Depth can be calculated and displayed. That is, if the shooting setting distance is D, the effective F value is Fx, the composite focal length is fX, and the allowable diameter of the circle of confusion is d, the near field distance 1) n is T) - fx2 /X2+ 1) −d−Wx.

Information on the composite focal length can be obtained when using an auxiliary light device such as an electronic flash (in this case, the light irradiation angle of the auxiliary light device exceeds the angle of view of the photographing optical system consisting of an interchangeable lens and a γ converter). - It can be used to judge whether to It is configured to input information on the light irradiation angle, and r+! -Compare the magnitude of the +i angle and the irradiation angle. The results of this comparison will determine whether it is necessary to install a beam angle changing adapter such as a tele panel or wide panel in the light emitting part of the auxiliary light device, or whether to set the beam angle to It can be used to judge whether or not to do so.

Furthermore, based on this comparison result, the variable illumination angle auxiliary light device can be driven to automatically set the appropriate illumination angle.

As an example of the actual rotation of the child chain to show the f7 degree angle rate of the rear converter, the ring is installed between the interchangeable lens and the camera body (11 in the middle ring).
] Ring can also be used for a configuration in which information is transmitted between the interchangeable lens (2) and the camera body (18). In other words, as shown in FIG. The intermediate ring (20) is equipped with an interchangeable lens (2).
Electric contacts (ell,)-, (el2), (C13), for transmitting information to the camera body (]8),
(C14), (C15), (C16), (
C17).

(cls), (el9) and (C20) are provided, as well as an electric contact (c37) for transmitting the movement of the photographing optical system due to the thickness of the intermediate ring, and an electric contact of the camera body (18) ((! 39), an electrical contact (C38) connected to the electrical contact (C37),
An electrical resistance (Rr) is connected between ((!38) and the electrical contact (!1/IL(C15).The resistance value of the resistor □□□r) is shown in Table 3, for example. As shown, when the feeding amount is 7N (gate), it is set to NRO (Ω)O, and for example, when it is 7 mm, it is 1 (0 α 14 theory - R
OΩ, 21 songs and @TRoΩ etc.

Table 3 When multiple intermediate rings are connected, the electrical contacts inside the rear end mount i'21 ((201)) of the front intermediate ring (C16), (C17) + (C18)
, (c19'+ + and (C20) are the electrical contacts (elf) inside the front end mount part (20a) in the rear intermediate ring, (C12), (C13),
(el, 4) and (c 15) to transmit the information of the interchangeable lens (2) to the camera body (18), and also connect the electrical contacts (C38) of the front intermediate ring to the electrical contacts of the rear intermediate ring. The resistors ar> of each intermediate ring are connected in parallel to each other V-. Now, n intermediate rings are connected, and their respective feeding amounts are 7N+, 7N2, -・-7Nn (
ram), each resistor 1 1
The resistance value of 1 σζr) is group, Ro, N2Ro,...
...N, Ro @), so the combined resistance value Rx of r) to the resistors connected in parallel is +-U・(Nl+N2-1- ・=・+Nn)Rx
R.

becomes. 'Therefore, if the resistance value Rx is detected by the detection circuit (22) within the camera body (18), these n
Extending the entire intermediate ring @dR dR = 7・(Nl + N2 + −−+ Nn)
(+n+n) is obtained.

Incidentally, in place of the electrical resistance in the embodiment shown in FIG. 7, a capacitor can be provided between the electrical contacts (el4), (el9) and the electrical contacts (e37), ((!38). For example, when the payout amount is 7N (in), the capacitor in the ring is NCo, that is,
As shown in Table 4, when performing @7 songs, CoPF is 1
2COFF at 4am, 3CoPF at 21am
etc.

Table 4 Now, n intermediate rings are connected, and the amount of each of them is 7N + r 7N" +..., 7Nn (
+n+n), the capacitance of each capacitor is NlC
o , N2GO, -・, NnCo (PF) T Ant, total capacitance of n capacitors connected in parallel Cx
is, Cx = Co (Nl +N2 +-...-1-Nn
), and if Cx is detected within the camera body, the amount of extension of the entire intermediate ring dR1 dR” 7' (Nl +N2 +・−・−+Nn)
(+nm) is required5 Information on the extension of the intermediate ring can be used in various ways within the camera body.

In other words, the effective F value (Fx) of the entire interchangeable lens and intermediate ring is calculated by changing the set F value of the interchangeable lens to the Ft1 helicoid.
dH1 The focal length is f1 The amount of power fed out by the intermediate ring is (IR), which is calculated as t FX-T (f + dH + dB). This calculation is performed by the exposure calculation circuit (23) to calculate the effective F. Once the value is determined, the effective F value can be displayed on the camera body and the effective F value can be set based on it, as in the case of a rear converter.In this case, the information on the interchangeable lens side, that is, the set F value The blowout dH1 and focal length f by the muhelicoid are the electrical contacts (ell) and (el6) of the intermediate ring, respectively.
, (el2), (el7) and (e13)
(e18).

In addition, the shooting distance Gx and the focal length of the interchangeable lens are 11
The amount of payout by the helicoid is determined from the first principal point of dH1 and the second principal point. If the distance between the principal points is 11 and the amount of extension by the intermediate ring is dR, then dH+dR is obtained, and the image magnification M is as follows. Gx and M can be calculated in the camera body.

8 and 9 show an intermediate ring whose delivery amount can be changed continuously. The intermediate ring (24) has a lens mount part (24a) at the front end and a camera marlant part (24b) at the rear end.

This intermediate ring (24) has electrical contacts (el, 1), (el2), (e'13) for information transmission between the interchangeable lens and the camera body, similar to those shown in FIGS. 1 and 2.
(el4), (el5) and electrical contacts (el6)
, (el7), (el8), (el9)
, (e20) not shown) is the lens mount part (24a
) and the inside of the camera mount part (24b), respectively, and the corresponding electrical contacts are 7 flexible conductive wires c? 6), 7j is electrically connected to A1°. The helicoidal female thread (28a) of the operating ring (28)
) id, the helicoid male part 30 a) of the fixed tube (30) integrated with the camera body + part (24I) 3 engages, and the helicoid male part 28 b) engages with the lens mount part (2/Ia). It meshes with the integral helicoid (32 a). Movable cylinder (32
a) is supported by a V-mechanism (not shown) so that rotation about the optical axis is driven relative to the fixed barrel (30), and only linear movement along the optical axis is possible; When the operating ring (28) is rotated toward the optical axis, the moving tube (32)
moves along the optical axis, and the feeding angle of the photographing optical system is changed depending on the thickness of the first intermediate ring (24).

The potentiometer make (34) includes an electric resistance (P) and a conductive plate (36) provided in parallel to each other on the peripheral wall inside the fixed cylinder (30) of the operation ring (28).
A contact piece (38) and (
40), and the light 11#l+ of the operation ring (28)
By rotating by i, the contact points of the contact pieces (38) and (40) with respect to the resistor (Rp) and the conductive plate (36) change, and the resistance value changes continuously. As shown in FIG. 9, one terminal of this potentiometer make (34) is connected to an electrical contact (C19), and the other terminal is connected to an electrical contact (C38).
) V is connected. The feeding amount of the intermediate ring is αlv
When l (mm), 1 Resistance value of tension meter (31I) n Ro (Ω)
If configured so that
111) can be read by the configuration of the detection circuit (8) shown in FIG.

In addition, in the above embodiment, the potentiometer (34)
Instead, a variable capacitor whose capacitance changes in conjunction with the operation of the operating ring (28) is provided, and its capacitance 1~2 is MCo (
1'F').

In addition, in the delivery place city / strange bellows, the delivery ■
(A potentiometer or a variable capacitor that changes the resistance value or capacitance according to the changing action is installed, so that when the amount of feeding is αN brain, the resistance value becomes NRoΩ, or when the feeding amount is αr'1 mm) When the capacity is N
It may be set to be CoPF. However, α is a constant that is set as appropriate.

Furthermore, the configuration in which the electrical physical quantity of the electrical part Io is changed in response to the change of the optical physical quantity of the intermediate accessory, as shown in this practical example, can also be applied to a variable magnification rear converter, that is, a zoom converter. .

The zoom converter has a plurality of optical elements that move as the operating unit side is operated to move relative to the fixed unit, and the magnification is continuously changed by a predetermined movement of these optical elements. It is something that

In this zoom converter, for example, a potentiometer is provided that changes the resistance value according to the relative movement of the operation part and the fixed member, and one end of the potentiometer is connected to a contact point (C
19), the other end is connected to the contact point (C21), and the resistance value thereof is configured to be n RoΩ when the magnification is λ·■. In this zoom converter as well, a variable capacitor may be used instead of the potentiometer, and the capacitance thereof may be set to be tMCo (]) where ■ is the magnification M.

10 to 12 (shown in FIGS. 10 to 12) are intermediate lens barrels installed between the interchangeable lens and the camera body, in which the optical system within the lens barrel is provided with a removable G, and acts as a rear converter when the optical system is attached. It shows the lens barrel that acts as an intermediate ring when the optical system is removed.

A lens mount part (4,
21), and the rear end (911) is provided with a camera mount part (42b).The contact pin (114) constituting the electrical contact is connected to the lens mount part (42;
) is supported to move in the optical axis direction by a support wall (42C), and the rear! 71'A1 is elastically pressed forward (to the left in the figure) by an electric contact piece (45) made of an elastic plate, while the collar (44, 8) is pressed against the support wall (45).
2C), and the support wall (4, 2C)
) protrudes from the front and stops at the puko position. When a camera mount of an interchangeable lens, an intermediate ring, a rear converter, etc. is attached to the lens mount (42a), the contact bin (44) is configured to be resilient to electrical contacts provided inside the camera mount. come into contact with On the other hand, an electric contact (46) is provided inside the camera mount part (42b), and the electric contact (46) is connected to the camera, intermediate ring, rear converter, etc. that can be attached to the camera mount part (42b). It is electrically connected to a contact pin provided inside the lens mount section of the GC.

In the lens barrel (42), a predetermined number of contact pins and electrical contacts having the same configuration as the contact pins (dll) and electrical contacts (46) are arranged inside the mount part (42a), (/12+)). A holding tube (50) that holds the spare optical system (=18) that constitutes the rear converter is inserted into a fitting tube (52) that is fixed inside the lens barrel (42). A detachable pin (5=
1) is fixed within the fitting tube (52) by being engaged with the tip. This removable bottle (54) has a fitting tube (54).
2) Between the position where the tip Vli+! part protrudes into the fitting cylinder (52) from the completed through hole (52a) and the position where it retreats to the outside of the fitting cylinder (52) is movably supported by the outer wall cylinder (56), and the detachable pin (
The collar (5/Ia) fixed to 54) is elastically pressed by a spring (58). The other end of the X1 de-pin (54) passes through the outer wall tube (56) and is fixed to the operating clamp (54b). Operation knob (54b
) to the outside against the spring (58), the detachable pin (5
4) is separated from the circumferential groove (50a) of the holder TN (50), so the holder H (50) is moved away from the camera mount part (
It can be removed to the outside of the fitting tube (52) through the opening of 42b). An interior board (6) fixed inside the lens barrel (42)
The detection switch (62) provided in the fitting tube (52) has a movable contact piece (62a) and a detection pin (62b)
) (7) The through hole (52b) in the wall is arranged so as to be in contact with the outer circumferential wall of the holding cylinder (50).
IJtl in Fig. 10 is held in the fitting tube (52) f6i
(50) is pushed by the detection pin (621) or the peripheral wall of the holding cylinder (50), and the movable contact piece (62
a) contacts the contact piece (62C), and the detection switch (62C)
) is closed and the holding cylinder (50) is completely removed, the detection pin (
62b) penetrates deeply into the water passage (521)) of the fitting tube (52), and the detection switch (62) opens.

In FIG. 12, the lens barrel (42) has electrical contacts (Q1.4) and (e19) for directly electrically connecting the electrical contacts of the interchangeable lens and the camera body.
Electrical contacts (C21) and (e22) for transmitting magnification information when using 42) as a rear converter
, and electric contacts (C37) and (C38) for transmitting information on the amount of feed when used as an intermediate ring, and a resistor (a) connected at one end to the electric contact (e21). and a resistor σ (10), one end of which is connected to the electrical contact (238).
) is connected to the detection switch (62) as shown in Figure 10.
) is closed, the other end of the resistor (RC) is connected to the electrical contact (
C19) and the detection switch (6
2) is opened, the other end of the resistor (R1ζ) is connected to the electrical contact (e 1.9). Resistance 0 (the meat is the holding cylinder (5
0) has a resistance value corresponding to the amount of extension of the intermediate ring by the lens barrel (42) from which the lens barrel (42) is removed, and the resistance 0 (C) is the resistance value when the holding tube (50) is installed in the lens barrel (ll2). It has a resistance value corresponding to the magnification as a rear converter.

Therefore, when the holding tube (50) is installed, the lens barrel (42) acts as a rear converter and transmits information on the magnification as a rear converter to the electrical contact (C14).
, (C19), (C21) and (C22), and when the first holding cylinder (50) is removed, it acts as an intermediate ring and transmits the information of the amount of feed as an intermediate ring to the electric contact ( C14), (C19), (C3
7) and (C38).

FIG. 13 shows the changeover switch circuit (
64) and a detection switch (62). Detection changeover switch (66) of intermediate lens barrel (68)
is a fixed contact piece (66a) connected to the resistor (RQ), a fixed contact piece (66b) connected to the resistor 0tR, and a movable contact piece (66a) that connects the detection pin similar to the detection switch (62).
66C), and when the holding cylinder (50) is installed,
Since the detection pin is pushed by the holding cylinder (50), the movable contact piece (66c) is connected to the fixed contact piece (66a), and the holding tube (50) is moved.
When the first cylinder (50) is removed, the detection pin is inserted into the fitting cylinder (50).
2), the movable contact piece (6
6C) is connected to the fixed contact piece (66b).

The embodiments shown in FIGS. 10 to 13 can also be used when attaching and detaching a parallel plane glass such as an optical filter in the intermediate ring (C. In addition to the resistor or capacitor, an electric resistor or capacitor having a physical quantity corresponding to the actual amount p~':output 4i1, which differs from the amount of movement of the focal point due to the introduction of the plane glass, is provided, and it is possible to attach and detach the plane glass. Switch the resistor or condenser accordingly.

In each of the above embodiments, even when a plurality of intermediate accessories (111j) are connected, electrical contacts (
C22), (C34), and ((!37)), but in intermediate accessories where only one is used, the electrical contacts CC22), (C34), and (C37) are omitted. In that case, electrical contacts ((!14),
(C32) does not need to be connected to the electrical contacts of the front interchangeable lens, the electrical contacts (C14), (C
Even if 32) is omitted, information on optical physical quantities can be transmitted.

1. In order to transmit information specific to the interchangeable lens, such as focal length and aperture f-number, to the camera body, the interchangeable lens and camera body are directly electrically connected without using any intermediate accessory contacts. A line may also be used.

Effect The intermediate accessory of the present invention has its inherent optical physics 111
Electrical object ρi corresponding to ■! By electrically connecting the electric member having Jj, ゛ to the detection circuit of the camera body through the electric contact, the optical physical information can be completely transmitted to the camera body, so that the deviation of the coupling position at the mount part can be avoided. Accurate information can be transmitted without being influenced. Also,
Since the electrical physics R of the electrical component can be varied over a wide range, it is possible to convey information for optical physics that varies widely or in many ways.

As in the embodiment, when a plurality of intermediate accessories are connected, if the electrical members of each intermediate accessory are electrically connected to each other in parallel, the optical components of the entire plurality of intermediate accessories are connected. y11 quantity can be transmitted accurately without significantly increasing the number of electrical contacts of each intermediate accessory.1. /'1° If the rear converter is shifted to transmit magnification information, the camera body can detect the effective 1' value by processing that information appropriately.
Accurate autofocus operation tube can be used for various operations.

Furthermore, if the intermediate ring transmits information on the amount of extension, the information can be processed appropriately and used in the camera body for detecting the effective F-number and for various operations of the detector tube for image magnification.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention; Figure 1 is a perspective view, Figure 2 is a circuit diagram, Figure 3 is a circuit diagram showing the main parts of the teleconverter, and Figure 4 1 is a circuit diagram showing the main parts of a wide converter. 5 and 6 show modified embodiments of the embodiment shown in FIGS. 1 to 4, and FIG. 5 is a circuit diagram showing the main parts;
FIG. 6 is a waveform diagram related to the operation of the detection circuit of the camera body. FIG. 7 is a diagram showing another embodiment. 8 and 9 show another embodiment, and FIG.
The figure is a partially cutaway perspective view, and Figure @9 is a circuit diagram showing the main parts. 10 to 12 show still other embodiments, FIGS. 1O and 11 are side sectional views, and FIG. 12 is a circuit diagram showing the main parts. FIG. 13 is a circuit diagram showing the main parts of a modified embodiment of the embodiment shown in FIGS. 10 to 12. +6L (20), (24), (42),
(68)・・・・・・Intermediate equipment (6a),
(20a), (24a), (42a), (68a
)...Front end mount part (6b), (20b),
(24b), (42b), (6813) ・=・
After %j? Run) part (C19), (C20), (
C31) ------First electrical contact (C21)
, (C33>, (C38)...
Second electrical contact ((!14.) l Ce15) l
(C32) ...=-... 3rd 'tEf
Air contact point (C22), <C34>, (C37)...
・・・・・・・・・・・・・4th electrical contact applicant Minolta Camera Co., Ltd. Figure 7 Figure 8 Figure 10 Figure 42

Claims (1)

[Scope of Claims] 1. An intermediate flexible product installed between an interchangeable lens and a camera body, which includes front and rear end mounts provided at the front and rear ends, respectively, and a rear end mount at the rear end mount. first and second electrical contacts provided to be electrically connected to the electrical contacts of the combined camera body or another intermediate accessory, and having electrical physical quantities corresponding to the optical physics specific to the intermediate accessory; and an electrical member connected between the first and second electrical contacts. 2. A third electrical contact 7-1 and a second electrical contact provided to be electrically connected to the first electrical contact and to the first electrical contact of another intermediate accessory coupled to the front end mount. A fourth electrical contact is provided to be electrically connected to the electrical contact and to be electrically connected to the second electrical contact of the intermediate accessory on the side, and the electrical member is the electrical member of the intermediate accessory on the side. 2. The intermediate accessory according to claim 1, wherein the intermediate accessory is connected in parallel to the intermediate accessory. 3. An optical system for changing the focal length of the imaging optical system coupled to the front end mount part by a predetermined magnification, and
3. The intermediate accessory according to claim 1, wherein the electric member has an electrical physical quantity corresponding to the magnification. 4. Claims characterized in that the imaging optical system coupled to the front end mount part has a thickness for extending the imaging optical system by a predetermined amount, and the electrical member has an electrical physical quantity corresponding to the amount of extension due to the thickness. Intermediate accessories for the war described in Paragraph 1 or Paragraph 2. 5. An intermediate item according to any one of claims 1 to 4, characterized in that the electric member is constituted by an electric resistance and is constituted by an electrical physical quantity or a resistance value;] Accessories. 6. Any one of claims 1 to 4 (intermediate accessory according to this description) characterized in that the electrical member is composed of a capacitor and the electrical physical quantity is capacitance.