JPS62159132A - Interchangeable lens - Google Patents

Abstract

PURPOSE:To accurately set an aperture value while the quantity of movement of a stop control member correspond to a stop-down quantity one to one by providing a defining member which defines the maximum displacement position of a stop-down member by a control member at a reference open aperture position. CONSTITUTION:A stopper 21 which functions as the defining member is provided in a slide groove 11 and when an interchangeable lens 100 is mounted on a camera body, a stop lever 12 is displaced by the top control member 6 of the camera body side to a stop opening side against the spring force of a spring 13. Then, the stop lever 12 is held at the maximum displacement position where the stop lever 12 abuts on the stopper 21, thereby obtaining an open aperture. Here, the position the stop 10 called the reference open aperture position, and then the fitting position of the stopper 21 is so determined that the stop is held at the reference open aperture position by the abutting stop lever 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention provides a method for measuring the brightness of a subject in an open aperture state.
The present invention relates to an interchangeable lens that can be used in a so-called aperture 71111 type camera.

(Background of the invention): Figure 5IO shows the mount part of the camera body, and Figure 11 shows the mount part of the interchangeable lens. In Figure 10, l is the mount of the camera body, and 2 is the mount. 3 is a detachable pin which is always elastically biased in front of the mount 1, 4 is an aperture,
A diaphragm control member 6 connected to a diaphragm setting mechanism (not shown) is slidably disposed in a sliding groove 5 provided on the side of the aperture 4 . The aperture control member 6 is always biased toward the upper portion 5a of the sliding groove 5 by an elastic member of the aperture setting mechanism.

In FIG. 11, 7 is the engaging claw 2 when the lens is attached.
8 is the mount base surface that comes into contact with the camera body mount when the lens is attached, 9 is the engagement groove into which the detachable pin 3 falls when the lens is attached, 10 is the aperture, and the aperture lO is inside the sliding groove 11. The aperture lever 12 is connected to the aperture lever 12 as a slidable aperture member, and the aperture IO is biased in the aperture direction by an elastic member (not shown). 11 is always biased towards the lower part 11a of the lens 11, and the aperture is kept at the minimum aperture.

Fit the claw part 7 of the lens into the engagement claw 2 of the camera body, and then push the lens into the 11th position until the detachable pin 3 aligns with the engagement groove 9.
When rotated in the direction of the arrow in the figure, the aperture lever 12 is biased upward in FIG. 11 by the aperture control member 6 of the camera body, and the aperture 10 becomes open. In an aperture metering camera, the brightness of the subject is measured with the aperture open in response to a release operation, and the aperture value is calculated based on other exposure control factors and the photometric value. Then, the aperture control member 6 is driven until the measured value of the operation amount in the aperture control member 6 matches the aperture value calculated and stored as described above, and the aperture lever 12 follows the aperture control member 6. moves in the aperture direction to aperture 10
is narrowed down to a predetermined value.

By the way, the aperture amount of the aperture 10 between the position Po where the aperture lever 12 abuts on the upper part 11b of the sliding groove 11 and the position P2 where the aperture lever 12 abuts on the lower part 11a has a relationship as shown in FIG. When the lever 12 is in the range of positions P0 to P1, the open aperture state does not change, and when the lever 12 exceeds position P1, the aperture is gradually closed down, and reaches the minimum aperture at position P2. That is, the first positions P and -P are the dead zone areas of the diaphragm 10.

When the lens is attached, if the aperture lever 12 is set to position P+ by the aperture control member 6 of the camera body (referred to as the open reference position, the position where the aperture actually starts from the open aperture), the amount of movement of the aperture control member 6 will be adjusted to the aperture control member 6. Although there is a one-to-one correspondence with the amount of
2 is defined as the position P0 or Po', there will be a region R where the aperture control member 6 is moved but the aperture does not actually start.

Therefore, the calculated aperture value is converted into the amount of movement of the aperture control member 6 and stored, and when the stored value and the measured value of the actual amount of movement of the aperture control member 6 match, the aperture control member 6
In a camera that attempts to obtain proper exposure by stopping the movement of the aperture control member 6, if the above region R exists, the amount of movement of the aperture control member 6 is originally small, so the influence of the above region R occurs and the aperture value does not change to the appropriate aperture value. The problem is that it deviates from the

(Purpose of the invention) The purpose of the present invention is to solve these problems.

To provide an interchangeable lens in which a diaphragm member is prevented from being biased beyond an open reference position value at which diaphragm actually starts from an open aperture.

(Summary of the Invention) The present invention is characterized in that it includes a regulating member that defines the maximum deflection position of the aperture member by the aperture control member, and that the regulating member is provided at the open reference position where the aperture actually starts to narrow down from the open aperture. shall be.

(Example) An example of the interchangeable lens of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a front view of the interchangeable lens 100 seen from the mount side, FIGS. 2 and 3 are configuration diagrams schematically showing the area around the aperture lever, and FIG. 2 shows the state of the interchangeable lens cii body. , FIG. 3 shows the state where it is attached to the camera body. As is well known, the aperture lever 12, which is connected to the aperture 10 and determines the amount of aperture, is constantly biased in the aperture direction by the aperture spring 13, and when the lens TII is in use, the aperture lever 12 is connected to the aperture 10 and determines the amount of aperture. The lever 12 is in the sliding groove 11
The minimum aperture shape fE is maintained by contacting the lower part 11a of the aperture.

In this embodiment, a stopper 21 that functions as a regulating member is provided in the sliding groove 11, and the interchangeable lens 100 is mounted on the camera body.
When the aperture control member 6 on the camera body side biases the aperture lever 12 toward the open aperture side against the spring force of the spring 13, the aperture lever 12 reaches the maximum deflection position where it contacts the stopper 21. The aperture lever 12 is held to open the aperture.

Here, if the position where the diaphragm 10 in the open aperture state actually starts narrowing down is called the open base position 11, then the stopper 2
1 is installed so that the aperture lever 12 in contact with the aperture lever 12 holds the aperture lO at the open reference position.

Therefore, as shown in FIG. 4, the opening reference position 5! where the aperture reel <-12 is in contact with the stopper 21! In response to the movement from t P I to position P2 where it contacts the lower part 11a of the sliding groove 11, the aperture l is moved by the spring force of the spring 13.
The amount of O throttle gradually decreases.

That is, in the interchangeable lens of the present invention, the aperture is insensitive to the aperture when the aperture is wide open. is not present, and the movement start position of the aperture control member 6 of the camera body, where the aperture lever is brought into contact with the stopper, can be set to the open reference position where the aperture actually starts to stop down from the open aperture. As a result, the aperture value determined by defining the position of the aperture lever 12 will always match the calculated aperture value. In addition, in FIG. 1, 22 indicates a lens identification pin for identifying the interchangeable lens of the present invention.

Hereinafter, an embodiment of a self-winding camera with a built-in motor using an interchangeable lens configured as described above will be described with reference to FIGS. 5 to 9.

FIG. 5 is a view of the winding side mirror box substrate 31 viewed from the winding lever side, and lOO indicates the above-mentioned interchangeable lens. As can be seen from this figure, the aperture lever 12 is
The aperture spring 13 as an elastic member is biased downward in FIG. 55, that is, in the direction in which the aperture lO is narrowed down.

The state jfj' in FIG. 5 is the state in which the shutter is charged and before the release operation, and the aperture control member 6 rotatably supported on the shaft 32 is biased counterclockwise by the spring 43 as an elastic member. The aperture lever 12 is brought into contact with the stopper 21, so that the aperture 10 becomes an open aperture. Further, a lens identification switch 46 is closed by the lens identification pin 22.

To explain the camera body in detail, the reflecting mirror 33 is attached to the axis 3.
It is held by a mirror holding member 35 which is rotatably supported by a mirror. A spring retaining pin 35a is attached to the mirror holding member 35.
is erected, and a mirror-down spring 36 is hung between the pin 35a and a spring hook 1)-pin 31a erected on the base plate 31, biasing the mirror holding member 35 clockwise. The mirror holding member 35 is attached to a stopper pin 51 which is provided upright on a rewind side mirror box substrate 51, which will be described later.
e receives the urging force, and as a result, the reflecting mirror 33 becomes 45
It is maintained at a certain degree.

A mirror drive lever 37, an aperture control member 6, and a biasing lever 38 are sequentially rotatably attached to a shaft 32 erected on the winding-side mirror box substrate 31 from the substrate 31 side.

The mirror drive lever 37 has a cam surface 37a, an arm portion 37b, a vertically bent portion 37c at the lower end, and two spring hooks 1L portions 37d, 3.
7e, and a spring hanging pin 31 erected on the board 31.
It is biased counterclockwise by a spring 39 stretched between the spring hook 1F portion 37d and the spring hook 1F portion 37d, and is positioned by coming into contact with a pin 31c erected on the base plate 31. In addition, the arm portion 37
b is an opening 31 of the substrate 31 that is erected on the mirror holding member 35;
It is possible to abut and engage with a pin 35a protruding from d. Further, the vertically bent portion 37c is connected to the arm 38 of the biasing lever 38.
(motor stop): It is possible to come into contact with the switch 40. The mirror drive lever 37 configured in this manner is moved clockwise against the spring 39 by a drive lever 41 that is disposed in contact with the cam surface 37a and is driven to the right by reverse rotation of a motor (not shown). It is possible to rotate in the direction.

The biasing lever 38 has arms 38a, 38b and spring latches Fffi.
The arm 38
a is in contact with the vertically bent portion 37c of the mirror drive lever 37. Further, the arm 38b is capable of abutting and engaging with a pin 6a provided upright in the aperture control member 6.

The aperture control member 6 includes vertical pins 6a, 6b and an arm 6C.
A spring 43 has a spring catch part 6d and is stretched between the spring catch part 38d and the spring catch W part 6d of the biasing lever 38.
The tip 6e of the arm 6C is pushed counterclockwise by the stopper 21 through the aperture/<-12 of the interchangeable lens 100.
It is in contact with. As a result, as described above, the diaphragm 10 is set at its maximum aperture when the interchangeable lens is attached. In addition, as mentioned above, the position of the aperture lever 12 that comes into contact with the stopper 21 (
4) and the position of the diaphragm control member 6 at this time is called the open reference position. Also, pin 6a
As described above, the pin 6b can come into contact with the arm 38b of the biasing lever 38, while the pin 6b can come into contact with the lever 45 fixed to the connecting shaft 44 which is rotatably supported on the base plate 31. It is possible to engage. This connecting shaft 44 is connected to the substrate 31
and an unwinding side mirror box substrate 51 that forms a mirror box together with this substrate 31.

FIG. 6 is a view of the rewind-side mirror box board 51 viewed from the rewind lever side, and shows the state before the release operation, similar to FIG. 5.

The float operating lever 52 fixed to the connecting shaft 44 is connected to the base plate 5
a switch contact piece 53 that can slide on patterns 54a and 54b of a reference switch board 54-1- provided in 1;
It has an upright pin 55. A fan-shaped tooth Ilj 56 is rotatably attached to a pin 51a erected on the base plate 51, and the arm 56a is brought into contact with the pin 55 of the gear actuating lever 52 by the spring force of a spring 60, which will be described later.
6b meshes with a small gear 57a of a reduction gear 57 rotatably attached to a shaft 51b erected on the base plate 51. The large gear 57b is connected to a shaft 51c erected on the board 51.
Gear portion 5 of ratchet wheel 58 rotatably attached to
8a, and also meshes with a gear portion 59a of a light-shielding disc 59 rotatably attached to a shaft 51d erected on the base plate 51. Reference numeral 65 denotes a photointerrupter that constitutes a pulse generating means together with the light-shielding disk 59, and as shown in FIG. The light receiving element 65b is arranged between the light receiving element 65b and the light receiving element 65b so that a pulse signal can be obtained from the light receiving element 65b.

In the gear train arranged in this way, the reduction gear 57
is biased counterclockwise by the spring 60, the sector gear 56 is biased clockwise, and its arm 56a is held in contact with the pin 55 of the gear operating lever 52.

Further, a control magnet 64 is provided on the substrate 51, and a pin 61 is also provided upright, and a locking lever 62 is rotatably attached to the pin 61. The locking lever 62 has a claw portion 62a, an arm 62b, and an armature 62c, and is biased counterclockwise by a spring 63. In FIG. 6, the armature 62c is attracted to the control magnet 64, thereby suppressing the rotational force of the locking lever 62 in the counterclockwise direction. The arm 62b is capable of abutting and engaging with a return lever 66 that is moved to the left by the above-mentioned IF rotation of the motor, and when the locking lever 62 is released from the control magnet 64 and engaged with the ratchet portion 58b. After that, the return lever 66 drives the arm 62b to the left to release the engagement between the claw portion 62a and the ratchet portion 58b.

FIG. 7 shows the control system of the camera described here; one terminal of the light receiving element 65b is directly connected to the counter 67, and the other terminal is connected to the counter 67 via the count-up switch 68 and the lens identification switch 46. It is also connected to the counter 67 via a reference switch 69 provided in parallel with the switch 46 . Here, the count-up switch 68 is closed by the release operation, the lens identification switch 46 is closed by the lens identification bin 22 when the interchangeable lens 100 shown in FIG. The switch 69 is
It consists of a switch contact piece 53 and patterns 54a and 54b. The quasi-switch 69 is closed when the diaphragm control member 6 is within the range from the above-mentioned open reference position to the position that defines the minimum diaphragm.

The operation of the camera configured in this way will be described below with reference to FIGS. 8 and 9.

In response to the release operation, the brightness of the subject is measured, and other exposure factors are also read to calculate the aperture value. The aperture value is determined in correspondence with the number of pulses obtained from the pulse generating means in accordance with the amount of movement of the aperture control member 6 from the open reference position Pl, and the number of pulses is stored in a predetermined storage area. . Further, the count-up switch 68 is closed by the release operation. here,
The lens identification switch 46 is closed.

After the above operations, the motor starts to rotate in reverse, thereby moving the drive lever 41 to the right and rotating the mirror drive lever 37 clockwise. This rotation of the lever 37 causes the biasing lever 38 to be applied to the lever 3 under the action of the spring force of the spring 42.
It rotates clockwise following the vertical bending portion 37c of No.7.

Further, the arm 37b of the lever 37 abuts and engages with the pin 35a of the mirror holding member 35 and the mirror 33 begins to rise counterclockwise, and the arm 38b of the biasing lever 38 engages with the pin 6a of the aperture control member 6. The aperture control member 6 is rotated clockwise through abutting engagement. Following this movement of the aperture control member 6, the aperture lever 12 is moved downward in the figure by the spring force of the aperture spring 13, so that the aperture lO is gradually narrowed down from the open aperture.

At this time, the pin 6b of the aperture control member 6 is connected to the connecting lever 45.
6 in the counterclockwise direction, the gear operating lever 52 shown in FIG. 6 rotates clockwise.

This movement of the lever 52 causes the sector gear 56 to rotate counterclockwise, and the reduction gear 57 to rotate clockwise via the small float 57a. As a result, the rotation of the sector gear 56 is amplified and transmitted to the ratchet wheel 58 and the light shielding disc 9.

Pulses obtained from the light receiving element 65b by the light shielding disk 59 rotated in this manner are counted by a counter 67 via both switches 68 and 46 which are closed. When the counted value of the counter 67 matches the number of pulses corresponding to the above-mentioned stored aperture value, the aperture control magnet 64
The magnet 64 is demagnetized by being energized. As a result, the armature 62c is opened and the lever 62 rotates counterclockwise due to the spring force of the spring 63.
2a engages with the ratchet portion 58b and the ratchet wheel 58
rotation is stopped. Therefore, the gear 57, the sector gear 56
The rotation of the gear operating lever 52, the connecting shaft 44,
Since the rotation of the connecting lever 45 is stopped, the rotation of the aperture control member 6 and the biasing lever 38 is stopped, and as a result, the movement of the aperture lever 12 is also stopped and the aperture 10 becomes the appropriate aperture value.

Even if each element is stopped as described above, the mirror drive lever 3
7 continues to rotate further to raise the reflecting mirror 33. When the vertical bending section 37c comes into contact with the motor stop switch 40 and closes the switch 40 almost at the same time as the ascent is completed, both ends of the motor terminals are short-circuited and the motor is braked, causing the motor to stop immediately. . This state is shown in FIGS. 8 and 9.

Next, several tens of milliseconds after the motor stop switch 40 is closed and the aperture stabilizes, as is well known, the power to the locking magnet of the shutter front curtain is cut off and the front curtain runs for a pre-calculated time. The rear curtain also runs afterwards. In response to this trailing curtain running signal, the stopped motor starts rotating forward and the drive lever 4
1 moves to the left, the mirror drive lever 37 is rotated counterclockwise by the spring 39, and the reflection mirror 7 is rotated clockwise by the down spring 36 following the lever 37. Further, when the arm 37c of the lever 37 abuts and engages the view 38a of the biasing lever 38, the biasing lever 38 is also rotated counterclockwise. As a result, the aperture control member 6 is rotated counterclockwise via the spring 43, so that the aperture control member 6 is rotated counterclockwise via the spring 43.
The aperture lever 12 moves upward in the figure against the spring force 3, and the aperture 10 gradually rotates.

The mirror drive lever 37 rotates counterclockwise while pushing the biasing lever 38 until it comes into contact with the stopper 31C.
Further, in the aperture control member 6, the aperture lever 12 is connected to the stopper 21.
However, since the aperture control member 6 stops before the mirror drive lever 37, the biasing lever 38 then rotates counterclockwise to release the spring 4.
3 will be further charged.

In parallel with this movement, the normal rotation of the motor drives the return lever 66 to the left in FIG.
The locking lever 62 abuts and engages with the arm 62b of the locking lever 62b.
is rotated clockwise against the spring force of the spring 63. As a result, the claw portion 62a of the locking lever 62 engages the ratchet portion 5.
The armature 62c is drawn from the diaphragm control magnet 64 and held by the aperture control magnet 64. Therefore, when the gear train return spring 60 rotates the gear 57 counterclockwise and the sector gear 56 rotates clockwise, its arm 56a abuts and engages the pin 55, so that the gear operating lever 52 rotates counterclockwise to return to the initial state shown in FIG. The connecting lever 45 will rotate up to (the state shown in FIG. 5).

Further, the return lever 66 is then driven to the right and returns to the initial position.

Note that the motor continues to rotate in the normal direction, winds up one frame of film, and then stops.

In this way, in the camera of this embodiment, the aperture control member 6
An open aperture is obtained at the open reference position where the aperture lever 12 contacts the stopper 21, and when the aperture control member 6 starts moving in the narrowing direction from that position, the aperture is gradually narrowed down. Therefore, the number of pulses counted during the movement of the aperture control member 6 corresponds to the amount of aperture, so that the aperture value to be set does not contain any error.

(Effects of the Invention) According to the present invention, the regulating member that defines the maximum deviation position of the diaphragm member by the diaphragm control member of the camera body is provided at the open reference position, and the diaphragm member starts moving in the diaphragm direction from the maximum deviation position. Since the aperture starts immediately, there is no dead zone in the aperture even if there is play when the lens is attached, and the aperture value can be accurately set because the amount of movement of the aperture control member corresponds one-to-one with the amount of aperture.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the interchangeable lens of the present invention as seen from the mount side, Figs. 2 and 3 are diagrams showing a schematic configuration around the aperture lever, and Fig. 4 is an aperture in the interchangeable lens of the present invention. Graph showing the relationship between lever position and aperture amount, 5th
6 and 6 show the aperture setting mechanism of the camera body using the interchangeable lens shown in FIGS. 1 to 3, and FIG. 5 is a front view of the parts arranged on the winding side mirror box board. FIG. 6 is a front view of the parts arranged on the mirror box board on the rewind side, FIG. 7 is a block diagram showing an example of its control system, and FIGS. Figure 10 is a diagram showing the mount surface of the camera body, Figure 11 is a diagram of a conventional interchangeable lens viewed from the mount side, and Figure 12 is a diagram of the conventional interchangeable lens. It is a graph showing the relationship between an aperture lever and an aperture height in an interchangeable lens. 6: Aperture control member 10: Aperture 11: Sliding groove 12: Aperture lever 13: Aperture spring 21: Stopper 22: Lens identification pin
33: Reflection mirror 35: Mirror holding member 37: Mirror drive lever 38: Biasing lever 39.42
, 43: Spring 41: Drive lever 40:
Motor stop switch 4B = Lens identification switch 52: Both vehicle operating lever 58: Sector gear 57: G speed gear 58: Ratchet wheel 59: Light shielding disc
62: Locking lever 64: Aperture control magnet 65: Pulse generating means 66: Return lever 67: Counter 68: Count-up switch 69: Reference position switch Applicant: Nippon Kogaku Kogyo Co., Ltd. Representative Patent Attorney Norio Nagai Fuyu 1 Fig. 4 Fig. 2 Fig. 3 Fig. 5 Fig. 3・ Fig. 9 Fig. 1θ Fig. 1f Fig. Straw and relay line x Fig. 12

Claims (1)

[Scope of Claims] A device that is attached to a camera, and includes an aperture, an elastic member that biases the aperture in the aperture direction, and an aperture member that cooperates with an aperture control member on the camera side to define the aperture position of the aperture. In an interchangeable lens in which the aperture control member biases the aperture member toward the open aperture side against the elastic force of the elastic member when the aperture control member 1. An interchangeable lens comprising a member, the maximum deflection position of which is set at an open reference position at which the aperture actually starts narrowing down from an open aperture.