JP2530619B2 - interchangeable lens - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable lens for mounting on a single-lens reflex camera or the like, and in particular, a novel motorized exposure apparatus (motorized aperture diaphragm or motorized lens shutter device). The present invention relates to an interchangeable lens having a built-in lens, a zoom mechanism, and a structure that does not cause a dead space in the lens barrel.

[Background of the Invention]

The non-interchangeable lens type 35mm camera is generally called a compact camera, and this type of camera is equipped with a lens shutter device that has both a shutter and an aperture as an exposure device. The lens shutter device mounted on recent compact cameras has a direct electromagnetic drive structure. In such a lens shutter device having a direct electromagnetic drive structure, a sector that carries shutter blades (that is, aperture blades) is used. The ring itself is the rotor of the electromagnetic drive (or motor). Although not put into practical use, a lens shutter device of a type in which a sector ring is rotated by a cylindrical (or ring-shaped) stepping motor having a ring-shaped rotor having a diameter similar to that of the lens barrel is also proposed. (See, for example, Japanese Patent Laid-Open No. 58-17428).

In these known lens shutter devices, the sector ring carrying the diaphragm blades (sectors) is driven by a motor directly coupled to it, which is complicated to rotate and position the sector ring by any angle. Since it does not require any mechanical mechanism, it is small and lightweight and suitable for electronic control.

On the other hand, in a single-lens reflex camera (hereinafter abbreviated as single-lens reflex camera) equipped with a lens having a larger aperture than a compact camera (hereinafter abbreviated as single-lens reflex camera), a focal plane shutter is mounted in the camera body and The lens) has a structure in which a diaphragm device is provided, and the diaphragm device is configured to be mechanically driven by a diaphragm driving device provided in the camera body via an interlocking lever. In the conventional single-lens reflex camera having such a structure, not only is the mechanical structure of the diaphragm driving device in the camera body complicated, but the mechanical structure of the lens barrel including the interlocking lever is related to the diaphragm device. Due to its complicated structure, the entire camera including the lens barrel is heavy and the volume of the entire camera is large.
Further, since power transmission to the diaphragm device is performed via a complicated mechanical power transmission mechanism, the response of the control operation is poor and it is not suitable for electronic control.

Therefore, in the conventional single-lens reflex camera, it is necessary to improve the diaphragm device to reduce the weight of the entire camera and to realize a diaphragm device that operates at high speed and has a good control response.

In order to reduce the weight and volume of the camera body and interchangeable lens, and to realize a diaphragm device that operates at high speed and has good control responsiveness, the diaphragm device for single-lens reflex cameras is a direct motorized type, as is the case for compact cameras. It is desirable to be configured as a diaphragm device.

However, conventionally, in the electromagnetic drive device of the lens shutter equipped in the compact camera, as described above, the sector ring itself (or the rotating plate having the same size as the sector ring) that carries the diaphragm blade becomes the rotor. Also, in the lens shutter device disclosed in the above publication, since the large-diameter ring serves as the rotor, the inertia of the rotor itself is very large (as is well known, the diameter of the rotor is D, and the dynamic acceleration is Assuming G, the inertial mass of the rotating body is proportional to GD ₂ , so in the above electromagnetic drive device in which the annular body having a large D is used as the rotor, the inertial mass of the rotor is very large). However, since the stator coil is an annular coil wound around the optical axis, it is not possible to increase the number of windings, resulting in high unwinding. There are drawbacks such as not being able to obtain a pair turn and thus obtaining only a small starting torque.
Therefore, it can be practically used as a diaphragm driving motor for a small-diameter lens like a compact camera, but it is impossible to adopt the structure of the electromagnetic driving device as a motor of a large-diameter diaphragm device for a single-lens reflex camera. It was That is, when a motor for a large-diameter diaphragm device having the same structure as that of the electromagnetic drive device is designed, it is difficult to start the rotor because the magnetomotive force cannot be increased despite the very large inertial mass of the rotor. As a result, step-out easily occurs and the rotor frequently vibrates at the stop position and does not rotate.

Therefore, it has been proved that a diaphragm device having the same structure as a lens shutter device equipped in a conventional compact camera cannot realize an electric diaphragm device for a large-diameter lens.

[Object of the Invention]

An object of the present invention is to provide an interchangeable lens having a built-in motorized exposure device (motorized diaphragm device or motorized lens shutter device) and having a zoom machine, and particularly configured to have a small volume. It is to provide an interchangeable lens.

[Outline of Invention]

The interchangeable lens according to the present invention includes a light-shielding blade (that is, an aperture blade or a shutter blade) and the like, is connected to a zoom mechanism, and is moved in the lens barrel along the optical axis direction. And a light-shielding blade drive motor projecting at a position eccentric with respect to the optical axis on one end face of the lens mirror, and the lens mirror so as to be parallel to the light-shielding blade drive motor at one stroke end position of the exposure apparatus body. And a device fixed in the cylinder. The exposure apparatus main body and the light-shielding blade drive motor are integrated to form an electric exposure apparatus.
The exposure apparatus main body includes a rotating member that carries a light-shielding blade, and a support member that rotatably supports the rotating member.
And another supporting member that supports the light-shielding blade driving motor and constitutes one end plate of the exposure apparatus main body, and the light-shielding blade driving motor is configured to emit light from the end surface of the latter supporting member. It projects parallel to the axis.

In the interchangeable lens of the present invention, the exposure apparatus main body and the motor are connected to the zoom mechanism of the lens barrel so as to be movable in the lens barrel along the optical axis. A device arranged in parallel with the light-shielding blade driving motor is fixed at the stroke end position. That is, in the above-described electric exposure apparatus, since the light-shielding blade drive motor projects from a part of one end surface of the exposure apparatus main body, the exposure apparatus main body is at the stroke end position in the lens barrel with this motor at the top. When it is moved up to, the dead space is generated between the end surface of the exposure apparatus main body and the inner end surface of the lens barrel. However, in the interchangeable lens of the present invention, the electronic circuit and other devices are arranged in this dead space. Is characterized by. Therefore, the interchangeable lens of the present invention can be made extremely small because it has a built-in electric exposure apparatus that is smaller than the conventional mechanical interlocking exposure apparatus and fully utilizes the space in the lens barrel.

Example of Invention

An embodiment of the interchangeable lens of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing the relationship between an electric exposure apparatus 19 inside an interchangeable lens 20 according to the present invention and a device 20b fixed inside a lens barrel 20a. The electric exposure apparatus 19 includes an exposure apparatus main body 19A having a light-shielding blade (aperture blade) built therein and an optical path hole formed therethrough, and a motor 19B protruding from one end surface of the exposure apparatus main body 19A in parallel with the optical axis direction. (That is, an electromagnetic drive device). The motorized exposure device 19 includes a lens barrel 20a.
A zoom mechanism provided inside moves the lens barrel 20a from the _first stroke end position Z ₁ to the second stroke end position Z ₂ in the optical axis direction. Since the motor 19B projects only at the portion, when the electric exposure apparatus 19 is stopped at the first stroke end position Z ₁ , the motor 19B is provided between the inner end surface of the lens barrel 20a and the end surface of the exposure apparatus main body 19A. A space where 19B does not exist is left as a dead space, so that the utilization efficiency of the space in the lens barrel is poor and the volume of the lens barrel is increased.

In the interchangeable lens of the present invention, at the first stroke end position of the electric exposure apparatus 19, the device 20b which can be brought close to the end surface of the exposure apparatus main body 19A in the space where the motor 19B does not exist is attached to the lens barrel.
It is characterized in that it is provided in 20a to effectively utilize the dead space. In general, the device 20b may be any device, but it is preferable that the device 20b is a case or a static device in which an electronic circuit component such as a control IC for the motor 19B, an autofocus motor, or an open protection switch is incorporated.

FIG. 2 is a perspective view showing the electric exposure apparatus 19 and the device 20b. In FIG. 2, an annular disc-shaped portion is an exposure apparatus main body 19A having a light-blocking blade, that is, a diaphragm blade 16 and a supporting mechanism for the same, and the optical axis direction from a part of one end surface of the exposure apparatus main body 19A. The arc-shaped portion projecting in is a motor 19B for driving the light shielding blade 16. The device 20b fixed in the lens barrel 20a is a case accommodating an electronic circuit for controlling the motor 19B and an electronic circuit to be provided in the interchangeable lens. The motor 19B and the device 20b are each formed in a partial arc shape so as to surround the optical path hole of the exposure apparatus main body 19A as shown in the figure.

Next, the structure of the electric exposure apparatus will be described in more detail with reference to FIGS. 2 and 3.

The motorized exposure apparatus of this embodiment shown in the assembled state in FIG. 2 has a motor 19B (a two-phase stepping motor in this embodiment) for driving the diaphragm blade, that is, the light-shielding blade, which will be described later. The rotor 2 and the stators 6 to 9 and the coils 12 and 13 for exciting the stator, the rotor-stator and the annular disk-shaped first supporting member 1 for supporting one end side of the coil, and the supporting member 1. The cam plate 15 (that is, the second support member) to be fastened, the cam plate 15
A rotary ring 17 which is rotatably supported by the rotor 2 and is rotated by the rotor 2, a diaphragm blade 16 pivotally mounted on the rotary ring 17 and whose movement is controlled by a cam plate 15, and fastened to one end surface of the support member 1. Conductive pattern plate 14,
The flexible printed board 18, which is electrically connected to the conductive pattern board 14 and also to the coils 12 and 13, the rotor 2 and the stators 6 to 9, the coil 12 and
The bearing plate 5 supports the other end of the bearing 13.

Support member 1, cam plate 15, rotating ring 17 and blades
16 and a portion fixed to them constitute an exposure apparatus main body 19A, and the support member 1 and the cam plate 15 constitute an end plate of the exposure apparatus main body 19A.

The support member 1, the cam plate 15, and the rotating ring 17 are provided with optical path holes 1a and 15i having inner diameters corresponding to the diameter of the taking lens, respectively.
And has 17 g. The support member 1 has a bearing 1b that rotatably supports one end 2a of the shaft of the rotor 2 at a position outside the optical path hole 1a.
Hole 1d for inserting and fixing the iron core 10 of the coil 1, hole 1c for inserting and fixing the iron core 11 of the coil 13, screw holes 1e for screwing the screws 3 for fastening the cam plate 15 to the support member 1, and the support member 1 An elongated hole 1f for changing the fastening position of the conductive pattern plate 14 is provided.

On the other hand, in the arcuate bearing plate 5 that is arranged to face one end surface of the support member 1 at a predetermined interval, in addition to the bearing 5a that rotatably supports the other end 2b of the shaft of the rotor 2, the coil 12
A hole 5b for inserting and fixing the iron core 10 and a hole 5c for inserting and fixing the iron core 11 of the coil 13 are provided.

The rotor 2 and the stators 6 to 9 and the coils 12 and 13 are located at a position between the support member 1 and the bearing plate 5, and
The space outside the optical path hole 1a (in other words, the rotating ring
The optical path holes 17g of 17 are arranged in a space outside the virtual cylinder having a cross section of 17g and are arranged in an arc shape along the peripheral edge of the optical path hole 1a. And only the rotor 2 has a bearing 1b
And 5a are rotatably supported, and the other members (that is, the stators 6 to 9 and the iron cores 10 and 11 of the coils 12 and 13, respectively) cannot rotate and move in the axial direction. Supported by 5 and 5.

The stators 6 to 9 have a plurality of teeth 6a to 9a arranged in an arc shape along the outer peripheral surface of the rotor 2 and holes 6b to 9b into which the iron cores 10 and 11 are fitted and fixed. The stators 6 and 7 are fitted into the iron core 10 of the coil 12 in the holes 6b and 7b, respectively, and are supported by the support member 1 and the bearing plate 5 together with the iron core 10 in a stationary state. At 8b and 9b, the coil 13 is fitted into the iron core 11 and is supported by the support member 1 and the bearing plate 5 together with the iron core 11 in a stationary state.

The rotor 2 is a columnar body composed of permanent magnets, and on its outer peripheral surface, N pole pieces and S pole pieces parallel to the axial direction are alternately arranged in the circumferential direction, and each N pole piece and each S pole piece are arranged. The circumferential length of the pole piece is substantially equal to the circumferential length of the teeth 6a-9a of the stators 6-9. In this embodiment, the number of N poles and S poles on the outer peripheral surface of the rotor 2 is 11, respectively, that is, the outer peripheral surface of the rotor 2 is formed by alternately arranging 11 N pole pieces and S pole pieces. ing.

The teeth 6a of the stator 6 and the teeth 7a of the stator 7 are alternately arranged along the outer peripheral surface of the rotor 2 as shown in FIG. 4 (a), and the teeth 8a of the stator 8 and the teeth of the stator 9 are also arranged. Similarly, 9a and 9a are alternately arranged along the outer peripheral surface of the rotor 2. The width l of the inner end surface of each stator tooth (the circumferential length l in the surface facing the outer peripheral surface of the rotor 2) is approximately equal to the circumferential length of each pole piece of the rotor 2 facing it, and therefore the stator teeth And the magnetic pole pieces of the rotor 2 can face each other. However, in this embodiment, as shown in FIG. 4 (a), the teeth 6a and 7a of the stators 6 and 7 are
Are arranged so as to face each pole piece of the rotor 2, and the teeth 8a and 9a of the stators 8 and 9 are arranged at an intermediate position between the N pole piece and the S pole piece of the rotor 2.

A shaft 2a on one end side of the rotor 2 penetrates a bearing 1b provided on the support member 1 and projects to the other end side of the support member 1, and a pinion 4 is attached to the projecting portion. The pinion 4 meshes with teeth 17c on the outer peripheral surface of the rotating ring 17, which will be described later, and transmits the rotation of the rotor 2 to the rotating ring 17.

At the lower part of the left end face of the support member 1 (the end face on the side where the rotor 2 and the like are arranged), the power supply line 12a to the coil 12 is provided.
The flexible printed board 1 to which the power supply line 13a to the coil 13 and the power supply line 14b to the conductive pattern plate 14 are connected
8 is attached with screws or adhesive. on the other hand,
A conductive pattern plate 14 having a conductive pattern 14a is fastened to the right end surface of the support member 1 with screws 14c, and the conductive pattern plate 14 is provided through the support member 1 so that the fastening position of the conductive pattern plate 14 can be changed. The screw 14c is inserted into the circumferential elongated hole 1f. The conductive pattern board 14 is electrically connected to the flexible printed board 18 by the power supply line 14b, and is connected to the control circuit via the flexible printed board 18.

The cam plate 15 fastened to the support member 1 is provided with four flat projections 15b to 15e corresponding to the positions of the screw holes 1e of the support member 1, and the projections 15b to 15e are provided on the projections 15b to 15e. An elliptical hole 15f into which the screw 3 can be inserted is provided. The hole 15f is long in the circumferential direction. Therefore, when the screw 3 is inserted into the hole 15f and screwed into the screw hole 1e of the support member 1 to fix the cam plate 15 to the support member 1, the cam plate 15 is fixed. By slightly rotating in the circumferential direction, the fastening position of the cam plate 15 with respect to the support member 1 can be changed.

The projections 15b to 15e of the cam plate 15 are configured as spacers for forming a gap between the support member 1 and the cam plate 15, and the inner peripheral surface of the projections 15b to 15e is the support surface of the rotating ring 17. The outer peripheral surface of the rotating ring 17 is formed by the protrusion 15
It is rotatably supported on the inner peripheral surface of b to 15e.

The rotating ring 17 is formed with five pin holes 17a, and each of the pin holes 17a has five diaphragm blades 16 (only one is shown in FIG. 3). The pin 16b that protrudes from the
Has been inserted. That is, five aperture blades 16 are pivotally attached to the rotating ring 17. The movement of each diaphragm blade 16 is controlled by a cam groove 15a formed in the cam plate 15, and a pin 16a protruding from each diaphragm blade 16 is inserted into the cam groove 15a so as to be slidable relative to each other. There is.

The outer peripheral surface of the rotary ring 17 is provided with teeth 17c that form a reduction gear driven gear portion that meshes with the pinion 4 and a protrusion 17b. A contact piece 17d that is in sliding contact with the conductive pattern 14a on the conductive pattern plate 14 is attached to the protrusion 17b, and the conductive pattern 14a and the contact piece 17d electrically detect whether the diaphragm is open or small. An on / off type detection means for the above is configured. In the case of this embodiment, the contact piece
When 17d is in contact with the conductive pattern 14a, the diaphragm is in a small diaphragm state, and when the contact piece 17d and the conductive pattern 14a are not in contact, the diaphragm is open. The detection means is for determining whether or not the diaphragm is open. For example, when the diaphragm blade moves toward the small diaphragm due to an external impact or the like, photometry is prohibited (that is, photographing is prohibited). A safety system has been configured to enable this.

When the support member 1, the cam plate 15 and the rotating ring 17 are assembled, the protrusion 15b of the cam plate 15 is the protrusion 17b of the rotating ring 17.
And the tooth 17c. Therefore, when the rotary ring 17 is rotated clockwise in FIG.
When one end 17f contacts one end surface 15g of the protrusion 15b, rotation of the rotary ring 17 in the clockwise direction is blocked, and when the rotary ring 17 is rotated counterclockwise, one of the protrusions 17b When the end surface 17e comes into contact with the other end surface 15h of the protrusion 15b, the counterclockwise rotation of the rotating ring 17 is blocked. That is, the protrusion 15b of the cam plate 15, the protrusion 17b of the rotating ring 17, and the one end 17f of the tooth 17c are configured as a stopper for limiting the rotation of the rotating ring 17 within a certain rotation angle range.

FIG. 4 is a diagram for explaining the relative positional relationship between the rotor 2 and the stators 6 to 9 and the rotation indexing operation of the rotor 2.

Further, FIG. 5 is a table for explaining the excited states of the stators 6 to 9 corresponding to FIG.

FIG. 4 (a) shows the relative positional relationship between the rotor 2 and the stators 6 to 9 when the coils 12 and 13 are not energized. At this time, the S pole piece of the rotor 2 is the stator 6. The rotor 2 is stationary while the N pole piece of the rotor 2 faces each tooth 7a of the stator 7. On the other hand, at this time, each tooth of the stator 8 and the stator 9
Half of the S pole piece and half of the N pole piece of the rotor 2 face each other at 8a and 9a. In this case, the angle θ between the endmost tooth of the stator 7 and the tooth of the stator 8 closest to the tooth is Is represented by (However, P is the pitch between adjacent teeth of the stators 6 and 7, and is the pitch between adjacent teeth of the stators 8 and 9.) The rotor 2 stopped in the state of FIG. In order to rotate the coils 12 and 13 by a predetermined angle, the energization time (or the number of control pulses) and the energization direction for the coils 12 and 13 are controlled, for example, as shown in FIG.

FIG. 5 shows the energization direction and energization time for the coils 12 and 13, with the abscissa representing the energization time (or the number of pulses) and the ordinate representing the on / off state. Also, A
4A to 4D show the energization of the coil 13 in the forward direction, is the energization of the coil 13 in the reverse direction, B is the energization of the coil 12 in the forward direction, and is the energization of the coil 12 in the reverse direction. Represents the energization of each.

A method for controlling the rotation of the rotor 2 will be described below with reference to FIGS. 4 (b) to 4 (d) and FIG.

As shown in FIGS. 4 (b) and 5, when the coil 13 is energized with A and the coil 12 is energized, the teeth 6a of the stator 6 become N.
The teeth 7a of the stator 7 are S, and the teeth 8a of the stator 8 are N.
, And the teeth 9a of the stator 9 are magnetized to S, respectively. Therefore, the teeth of the stators 6 to 9 and the magnetic pole pieces on the outer peripheral surface of the rotor 2 attract or repel each other, and
Although it rotates counterclockwise by 1 / 4P, the force exerted on the rotor 2 by the stators 6 and 7 when rotating by 1 / 4P and the stator 8
Since the forces exerted by the rotors 9 and 9 on the rotor 2 are equal and opposite to each other, the rotor 2 stops. At this time, as shown in FIG. 5, when only the energization to the coil 12 is cut off, the stators 6 and 7 are demagnetized and, as shown in FIG. 4 (c), only the excited states of the stators 8 and 9 are continued. It Therefore, the rotor 2 stopped at a position displaced by 1 / 4P with respect to each tooth of the stators 6 and 7 until its N pole piece faces the tooth 9a (magnetized by S) of the stator 9 directly. It will rotate counterclockwise and then stop again. And
The rotation angle of the rotor 2 in this case is also 1 / 4P.

Next, as shown in FIG. 4 (d), B is applied to the coils 12 and 13, respectively.
When the energization and the A energization are performed, the tooth 6a of the stator 6 is excited by S, the tooth 7a of the stator 7 is excited by N, while the tooth 8a of the stator 8 is N and the tooth 9a of the stator 9 is S
Since they are excited respectively, the rotor 2 rotates counterclockwise by 1 / 4P and then stops by the same principle as described above.

As shown in FIG. 5, the number of combinations of the energizing directions to the coils 12 and 13 is 5 in addition to the above, B, B, ..., There are 8 ways of energizing in total. In the apparatus of the present embodiment, the rotor 2 is rotated stepwise by pulse-controlling the energization of the coils 12 and 13 with one pulse of the above-mentioned energization method.

The electric exposure apparatus of the present embodiment having the structure as shown in FIGS. 2 and 3 is incorporated in the lens barrel of the interchangeable lens as shown in FIG. 1, and the interchangeable lens is attached to the camera body to perform AE (automatic exposure control device). Fig. 6 shows a part of a control block diagram in the case of a camera.

In FIG. 6, 21 is a photometric circuit, 22 is a light amount setting circuit,
Reference numeral 23 is a shutter drive circuit, 24 is a clock pulse generation circuit, 25 is a distribution circuit, and 26 is a motor control circuit.

Next, the control operation and the diaphragm blade when shooting with the camera
The operation of 16 will be described with reference to FIGS. 3 and 6.

When you press the release button of the camera at the time of shooting, the photometry circuit 21 operates to automatically perform photometry, and the light quantity setting circuit 22 uses the film sensitivity, based on the photometry value obtained as a result.
The required number of aperture steps is determined by calculation from the required shutter speed, required aperture value, etc. (In the case of the present embodiment, when the rotor 2 rotates one step, the aperture diameter becomes 1/8.
The shape of the cam groove 15a and the rotation angle of the rotating ring 17 are designed so as to change stepwise. That is, in the case of the present embodiment, the relationship between the shape of the cam groove 15a and the rotating ring 17 is determined so that the aperture changes by one step when the rotor 2 is rotated by 8 steps. The number of diaphragm stages determined by the light amount setting circuit 22 is input to the distribution circuit 25, which divides the clock pulse into predetermined steps and inputs the divided pulses to the motor control circuit 26. The motor control circuit 26 controls the direction of the current flowing through the coils 12 and 13 and which coil is to be supplied according to the input signal, and as a result, the rotor 2 is rotated in a predetermined direction by a predetermined angle. (The control of the rotation of the rotor 2 has already been described, so the description is omitted.) Therefore, the ring 17 is rotated via the pinion 4,
The diaphragm blade 16 pivotally attached to the ring 17 is rotated around the axis of the ring 17 together with the ring 17, and is swung along the cam groove 15a about its own pin 16b.
When the diaphragm blade 16 is rotated clockwise about the pin 16b in FIG. 1, the diaphragm is opened, and the pin 16b is opened.
When a reaches the outermost position of the cam groove 15a, the diaphragm is opened. (When the diaphragm is opened, the contact piece 17d carried on the rotating ring 17 and the conductive pattern 14a on the conductive pattern plate 14 are no longer in contact with each other. [Effects of the Invention] As described above, in the interchangeable lens of the present invention, the electric exposure apparatus 19 having the motor 19B protruding from one end of the exposure apparatus main body 19A. Is incorporated in the lens barrel with the zoom mechanism, while the device 20b that can enter the space where the motor 19B does not exist is fixed in the lens barrel 20a at one stroke end position of the electric exposure apparatus, so that the diaphragm operation is performed electrically. It is possible to realize a small interchangeable lens having no dead space in the lens barrel.

[Brief description of drawings]

FIG. 1 is a diagram conceptually showing the structure of an interchangeable lens according to the present invention, and FIG. 2 is a perspective view showing an electric exposure apparatus and a lens barrel-installed device equipped in the interchangeable lens of the present invention. 3 is an exploded perspective view of the electric exposure apparatus shown in FIG. 2, and FIGS. 4 (a) (b) (c) (d) and FIG. 5 are motors of the electric exposure apparatus shown in FIG. 6 is a block diagram showing a part of the exposure-related control circuit in the camera equipped with the interchangeable lens of the present invention. DESCRIPTION OF SYMBOLS 1 ... Support member, 2 ... Rotor 4 ... Pinion, 5 ... Bearing plate 6-9 ... Stator 10 and 11 ... Stator coil iron core 12 and 13 ... Stator coil 14 ... Conductive pattern plate, 15 ... Cam plate 16 ... Diaphragm blade , 17 ... Rotating ring 18 ... Flexible printed board 19 ... Electric exposure device, 19A ... Exposure device main body 19B ... Motor, 20 ... Interchangeable lens 20a ... Lens barrel, 20b ... Equipment

Claims (1)

(57) [Claims] 1. An interchangeable lens having a zoom mechanism built in a lens barrel, which has an optical path hole centering on an optical axis, a light-shielding blade for opening and closing the optical path hole, and the like, which is connected to the zoom mechanism. An exposure apparatus main body that is moved in the lens barrel along the optical axis direction, and a light shield that is provided outside one of the optical path holes on one end face of the exposure apparatus main body and that is projecting at a position eccentric to the optical axis. A blade driving motor, and a device fixed in the lens barrel so as to enter a space where the light shielding blade driving motor does not exist at one stroke end position of the exposure apparatus main body,
An interchangeable lens characterized by having.