JP3550602B2 - Interchangeable lens camera - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an interchangeable lens camera, and more particularly to an interchangeable lens camera provided with a barrier that covers an opening of a lens barrel unit insertion portion of a camera body.
[0002]
[Prior art]
Conventionally, in an interchangeable lens camera, in order to prevent dust from entering the camera body, if a lens is not attached to a fastening portion between the interchangeable lens and the camera body, that is, a so-called mount portion, a separate body is required. He was wearing a cap. In addition, when a lens was attached to the camera body, a separate lens cap was attached to the lens side.
[0003]
[Problems to be solved by the invention]
However, when attaching a separate body cap without mounting a lens on the mount portion of the camera body as described above, it is not easy to attach or remove the body cap to or from the camera body, and the camera body When a body cap is not required, such as when a lens is attached to the camera, there is a risk that the body cap may be lost, resulting in inconvenience in handling.
[0004]
Furthermore, when a lens is attached to the camera body, the lens cap is usually attached to the lens side without using the body cap. Usually, in the interchangeable lens type camera, the body cap and the lens cap cannot be used in many cases, and the handling is further inconvenient. This is because when using interchangeable lenses having various focal lengths, the lens aperture varies, so that the lens cap itself must have various sizes.
[0005]
Accordingly, it is an object of the present invention to provide an interchangeable lens camera having a barrier that is easy to handle and has good operability.
[0006]
Another object of the present invention is to make it possible to accurately close the opening of the lens barrel unit insertion portion without using a separate body cap, in a state where a lens is not mounted, in an interchangeable lens camera. An object of the present invention is to make it possible to accurately perform dustproof measures in a camera body without sacrificing operability.
[0007]
Still another object of the present invention is to allow the lens opening to be covered even when the lens is mounted on the camera body, so that dust does not enter the lens and the camera body without using a separate lens cap. Is to be able to prevent the problem accurately.
[0008]
Still another object of the present invention is to provide an interchangeable lens camera that can accurately close a lens opening without requiring a separate body cap and lens cap, regardless of whether an interchangeable lens is attached or not. Is to do.
[0009]
Still another object of the present invention is to cover the lens opening properly when an interchangeable lens is mounted, regardless of the type of the interchangeable lens, and without requiring a lens cap or the like for each interchangeable lens. It is an object of the present invention to provide an interchangeable lens camera capable of performing such operations.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an interchangeable lens camera in which a lens barrel unit having a photographing lens is mounted on a camera body, and wherein the lens barrel unit is mounted on a camera body. A movable mechanism for fixing, and a barrier covering a front surface of the lens barrel unit insertion portion, wherein the movable mechanism opens at least the barrier and makes the lens barrel unit detachable from a camera body. And a second position for closing the barrier when the lens barrel unit is not mounted.
[0011]
Further, the movable mechanism may be configured to have a third position in which the barrier is opened when the lens barrel unit is mounted. In this case, when the movable mechanism is in the third position, it is advantageous that the barrier is opened, and the photographing lens of the lens barrel unit is extended to a photographing position to prepare for photographing. .
[0012]
Further, the movable mechanism may be configured to have a fourth position for closing the barrier when the lens barrel unit is mounted. In this case, it is advantageous that the barrier is configured to cover the front surface of the lens barrel.
[0013]
Further, it is convenient that the camera body includes a light-shielding device that shields the exposure opening, and the light-shielding device is configured to be opened and closed according to attachment and detachment of the lens barrel when the movable mechanism is at the first position. is there.
[0014]
The movable mechanism includes a lens attachment / detachment lever, and an attachment / detachment ring having a cam groove that rotates in conjunction with the lens attachment / detachment lever and is engageable with a cam pin of the lens barrel unit. When the lens barrel unit is mounted on the camera body, the cam pins of the lens barrel unit engage with the cam grooves of the attachment / detachment ring, and the lens attachment / detachment lever moves to define the lens barrel unit by the cam grooves. It can also be configured to perform an exercise.
[0015]
In this case, a rotation limiting groove is provided on the camera body side, and when the movable mechanism is at the first position, the rotation limiting groove and the cam groove of the detachable ring are aligned, and the lens mirror is passed through the rotation limiting groove. Conveniently, the cam pin of the cylinder unit is configured to be insertable into the cam groove.
[0016]
In addition, it is advantageous that the barrier is opened and closed in conjunction with the movement of the lens attaching / detaching lever.
[0017]
According to a second aspect of the present invention, in a lens-interchangeable camera in which a lens barrel unit having a photographic lens is mounted on a camera body and used, a movable mechanism for fixing the lens barrel unit to a camera body is provided. A barrier that covers a front surface of the lens barrel unit insertion portion, wherein the movable mechanism opens at least the barrier to allow the lens barrel unit to be attached to and detached from a camera body; A second position for closing the barrier in the mounted state.
[0018]
Further, the movable mechanism may be configured to have a third position in which the barrier is opened when the lens barrel unit is mounted. In this case, when the movable mechanism is in the third position, it is advantageous that the barrier is opened and the taking lens of the lens barrel unit is extended to the taking position to prepare for taking a picture.
[0019]
Further, when the movable mechanism is in the second position, the barrier is preferably configured to cover the front surface of the lens barrel unit.
[0020]
Further, it is advantageous that a light-shielding device for shielding the exposure opening is provided, and the light-shielding device is configured to be opened and closed according to attachment and detachment of the lens barrel unit when the movable mechanism is in the first position.
[0021]
In addition, the movable mechanism includes a lens attachment / detachment lever, and an attachment / detachment ring that rotates in conjunction with the lens attachment / detachment lever and has a cam groove engageable with a cam pin of the lens barrel unit, When the lens barrel unit is mounted on the camera body, the cam pins of the lens barrel unit engage with the cam grooves of the attachment / detachment ring, and the lens attachment / detachment lever moves to define the lens barrel unit by the cam grooves. It can also be configured to perform an exercise.
[0022]
Further, a rotation restricting groove is provided on the camera body side, and when the movable mechanism is at the first position, the rotation restricting groove and the cam groove of the detachable ring are aligned, and the lens barrel unit passes through the rotation restricting groove. It is convenient to configure the cam pin so that it can be inserted into the cam groove.
[0023]
Further, the cam groove of the detachable ring mounts the lens barrel unit when the movable mechanism is at the first position, and retracts and fixes the lens barrel unit when the movable mechanism is switched to the second position. It may be configured to have a spiral cam groove portion to be formed.
[0024]
Further, it is advantageous that the barrier is opened and closed in conjunction with the movement of the lens attaching / detaching lever.
[0025]
[Action]
In the above-described interchangeable lens camera according to the first aspect of the present invention, the lens barrel unit can be attached to or detached from the camera body by setting the movable mechanism to the first position. Then, when the lens barrel unit is not mounted on the camera body or removed from the camera body and the movable mechanism is switched to the second position, the barrier is closed with the lens barrel unit not mounted. This closes the lens opening of the camera body when the interchangeable lens is not mounted. Therefore, dust and other intrusion into the camera body can be prevented with a simple operation. Further, since a separate body cap or the like is not required, a camera body which is extremely easy to handle without fear of losing the body cap can be obtained.
[0026]
Further, when the movable mechanism is provided with a third position in which a barrier is opened when the lens barrel unit is mounted, the lens barrel unit is mounted on the camera body at the first position, and then the movable body is moved. By moving the mechanism to the third position, it is possible to quickly take a picture. In this case, when the movable mechanism is moved to the third position, the barrier is opened and the taking lens of the lens barrel unit is extended to the taking position to prepare for taking a picture. Operability is improved, and quick photographing can be performed.
[0027]
Furthermore, by providing the movable mechanism with a fourth position for closing the barrier when the lens barrel unit is mounted, it is possible to accurately protect the taking lens without requiring a separate lens cap or the like. The reliability of the camera can be improved, and the handling of the camera becomes extremely convenient.
[0028]
Further, when the movable mechanism is in the first position, a light-shielding device that opens and closes in accordance with attachment and detachment of the lens barrel is provided in the exposure opening, so that light is completely shielded from a film for photographing and the like. Exposure can sometimes be made quickly.
[0029]
The movable mechanism includes a lens attaching / detaching lever and the attaching / detaching ring. When the lens barrel unit is mounted on the camera body, the cam pins of the lens barrel unit engage with the cam grooves of the attaching / detaching ring. By configuring the lens barrel unit to move by moving the lens attaching / detaching lever, a highly reliable camera can be realized with a simple device configuration.
[0030]
Further, a rotation restricting groove is provided on the camera body side so that the rotation restricting groove and the cam groove of the detachable ring are aligned when the movable mechanism is at the first position, and the lens barrel passes through the rotation restricting groove. By configuring the cam pins of the unit to be inserted into the cam grooves, the lens barrel unit can be mounted on the camera body very easily and with a simple operation.
[0031]
Further, by configuring the opening and closing of the barrier in conjunction with the movement of the lens attaching / detaching lever, the barrier is automatically moved when the movable mechanism is moved from the first position to the second position. The camera body and the lens can be configured to be closed, and the camera body and the lens can be properly protected by a simple operation without requiring a separate body cap and a lens cap.
[0032]
Next, in the above-described interchangeable lens camera according to the second aspect of the present invention, the movable mechanism is set to the first position, and the lens barrel unit is attached to the camera body. By moving to the position, the barrier can be closed with the lens barrel unit mounted. Therefore, the taking lens can be protected without the need for a separate lens cap or the like, and a lens interchangeable camera with good operability and high reliability can be realized.
[0033]
Further, by providing the movable device with a third position in which the barrier is opened in a state where the lens barrel unit is mounted, it is possible to perform photographing or preparation for photographing only by setting the movable mechanism to the third position. This makes it possible to realize a camera with excellent operability. In this case, when the movable mechanism is set to the third position, the barrier is opened, and the photographing lens of the lens barrel unit is extended to the photographing position to prepare for photographing. The operability is improved, and quick shooting can be performed.
[0034]
Furthermore, a light-shielding device that shields the exposure opening is provided, and the light-shielding device is configured to be opened and closed in accordance with attachment and detachment of the lens barrel unit when the movable mechanism is in the first position, so that a photographic film portion is provided. This makes it possible to accurately perform light-shielding and the like, and to perform quick shooting at the time of shooting.
[0035]
The movable mechanism includes a lens attachment / detachment lever and the attachment / detachment ring.When the lens barrel unit is mounted on the camera body, a cam pin of the lens barrel unit engages with a cam groove of the attachment / detachment ring, By configuring the lens barrel unit to move by the movement of the lens attaching / detaching lever, a highly reliable lens interchangeable camera with a simple structure can be realized.
[0036]
Also, a rotation limiting groove is provided on the camera body side, and when the movable mechanism is in the first position, the rotation limiting groove and the cam groove of the detachable ring are aligned and the lens barrel unit is inserted through the rotation limiting groove. The cam pin can be inserted into the cam groove so that the lens barrel unit can be accurately mounted on the camera body by a simple operation.
[0037]
Further, the cam groove of the detachable ring is a spiral in which the lens barrel unit is mounted when the movable mechanism is at the first position, and then when the movable mechanism is switched to the second position, the lens barrel unit is retracted and fixed. By having the cam groove portion, the lens barrel unit can be securely retracted and fixed in the camera body only by rotating the detachable ring by operating the lens detachable lever. This greatly improves operability when the lens is mounted.
[0038]
Furthermore, by configuring the opening and closing of the barrier in conjunction with the movement of the lens attaching / detaching lever, the camera body and the photographing lens can be quickly protected without using a separate body cap or lens cap. become. Therefore, an interchangeable lens camera that is highly reliable and easy to handle can be realized.
[0039]
In short, in the interchangeable lens camera according to the above configuration, since the opening of the insertion portion of the lens barrel unit is covered in accordance with the movement of the movable mechanism, the camera body or the lens regardless of whether the lens is mounted or not mounted It is possible to prevent dust and foreign matter from entering the taking lens. Therefore, the camera body and the photographing lens can be protected without using a separately provided body cap or lens cap, and an extremely interchangeable lens camera can be realized.
[0040]
Further, since the operation of the barrier is performed in conjunction with the movable mechanism for fixing the lens barrel unit, the operability is extremely good.
[0041]
Furthermore, since a light-shielding device that opens and closes in accordance with the attachment and detachment of the lens barrel unit is provided in the exposure opening, there is no danger of exposure to a photographic film or the like even when the lens barrel unit is removed from the camera body. Further, when the lens barrel unit is mounted, the light shielding device is open, so that the photographing operation can be performed quickly.
[0042]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the appearance of an interchangeable lens camera according to one embodiment of the present invention. In FIG. 1, a camera body 1 has an outer shell covered by a cover 2. For example, a release button 3 is provided on the upper surface of the camera, and a window 4 and a speedlight 5 are arranged on the front surface. A well-known photometric device, distance measuring device, finder, and the like are arranged in the window 4. An opening 2a is provided at the center for the lens barrel unit 51 to advance and retreat. The portion of the camera body 1 following the opening 2a has a cylindrical shape. The cylindrical portion is provided with a rotation limiting groove 1a for attaching and detaching a lens barrel unit described later. A detachable ring 8 is provided at the rear of the cylindrical portion of the camera body so as to be rotatable with respect to the camera body 1 and immovable in the optical axis direction. The detachable ring 8 is provided with a cam groove 8a, which engages with a cam pin 52b provided on the outer periphery of the outer cylinder 52 of the lens barrel unit 51. A rotation limiting pin 52a is provided on the outer periphery of the outer cylinder 52 of the lens barrel unit 51, and engages with the rotation limiting groove 1a.
[0043]
The lens barrel unit 51 is provided with a barrel gear 53a that engages with a coupling gear incorporated in the camera body 1 described later. A movable barrel 54 including a photographic lens and the like is provided inside the outer barrel 52 of the lens barrel unit 51.
[0044]
FIG. 2 is a plan view showing the bottom surface of the interchangeable lens camera shown in FIG. 1 and shows a state where the lens barrel unit 51 is mounted on the camera body and shooting preparation is being performed. That is, the lens 2 is mounted on the cover 2 so as to be slidable in the direction of the arrow, that is, in the left and right directions with respect to the plane of the drawing. When the lens barrel unit is mounted on the cover 2, an index “OFF” indicating a non-photographing state in which the barrier is closed, the lens barrel unit is mounted and fixed, and the movable barrel 54 of the lens barrel unit is exposed. Indices of “ON” indicating a shooting preparation state, “INSERT” indicating a detachable state of the lens barrel unit, and “CLOSE” indicating a barrier closed state when the lens barrel unit is not attached are provided. . Therefore, by sliding the index 9b of the lens attaching / detaching lever 9 to a desired index position, each of the above-described functions can be obtained. The details of the function at each position will be described later.
[0045]
FIG. 3 is a block diagram showing a configuration of an electric circuit used in the circuit of FIG. The circuit in FIG. 3 includes a control circuit 40 constituted by, for example, a microprocessor. A well-known distance measuring device 41, a photometric device 42, and a film feeding device 43 are connected to the control circuit 40. Further, a lens barrel motor 21 for driving the lens barrel and a photo interrupter 23 for detecting the drive position are connected.
[0046]
In addition, the control circuit 40 is connected with, as operation switches, a half-press switch S1, a full-press switch S2, and a switch KYS for detecting a lens barrel reference position. The functions such as the switch KYS will be described later.
[0047]
Further, the control circuit 40 is connected to a switch encoder 10 which instructs an operation state of the camera in conjunction with a lens attaching / detaching lever 9 described later.
[0048]
Further, the control circuit 40 includes a non-volatile storage device for storing shutter 55 of the lens barrel unit and photographing lens information, for example, E. ² The PROM 58 is connected.
[0049]
The above devices connected to the control circuit 40 are connected to the control circuit 40 via an interface circuit (not shown) as necessary. The operation of the circuit of FIG. 3 will be described later.
[0050]
FIGS. 4 to 8 are cross-sectional views of the camera showing each process when a lens barrel having a single focus lens, for example, a photographic lens having a focal length of 35 mm, is mounted on a camera body and used.
[0051]
FIG. 4 shows a state in which the lens attachment / detachment lever 9 is at the “CLOSE” position and the lens barrel unit 51 is disengaged from the camera body 1. In this state, the barrier 28 is closed to close the lens barrel unit insertion portion on the front of the camera body.
[0052]
In the lower part of the camera body 1, there is provided a rotation limiting groove 1a for preventing the lens barrel from rotating when the lens barrel unit 51 is mounted. A detachable ring 8 for attaching and detaching the lens barrel unit 51 is disposed continuously behind the portion of the camera body 1 where the rotation limiting groove 1a is formed, and the detachable ring 8 is rotatable with respect to the camera body 1. And is supported so as not to move in the optical axis direction. The detachable ring 8 is provided with a spiral cam groove 8a for retracting and fixing the lens barrel unit 51 when the lens barrel unit 51 is mounted.
[0053]
The cover 2 holds a lens attachment / detachment lever 9 which is movable in a direction perpendicular to the plane of the drawing. The lens attachment / detachment lever 9 is provided with a rack 9a that engages with a gear 8b formed on the outer periphery of the attachment / detachment ring 8. Therefore, when the detachable lever 9 is slid in the direction perpendicular to the paper surface, the detachable ring 8 rotates around the optical axis. On the other hand, the detachable lever 9 is provided with a brush 9b, and generates a signal according to the state of the detachable lever 9 by moving on the pattern of the switch encoder 10 in the camera body.
[0054]
The mounting of the lens barrel unit 51 is performed by setting the lens attaching / detaching lever 9 to a predetermined position and engaging the cam pin 52b of the lens barrel unit 51 with the cam groove 8a of the attaching / detaching ring 8. explain.
[0055]
A contact pin 11 for obtaining electrical connection with the lens barrel unit 51 is provided at a rear portion of the camera body 1.
[0056]
A light-shielding blade 13 is provided in front of an aperture 12 for exposing the film, and the light-shielding blade 13 is shown in FIG. 4 when the lens barrel unit 51 is detached from the camera body 1. It is closed as shown to shield the aperture 12 from light.
[0057]
A lens barrel motor 21 for driving a lens barrel is provided on the upper part of the camera body 1. At one end 21a of the shaft of the lens barrel motor 21, an impeller 22 having a radially formed slit is mounted. Then, the passage through the slit is read by the photo interrupter 23, and the rotation amount of the lens barrel motor 21 is detected as a pulse. A pinion gear 24 is mounted on the other end 21 b of the shaft of the lens barrel motor 21, and the pinion gear 24 is engaged with a coupling gear 25 supported by a bearing 1 b of the camera body 1. The coupling gear 25 is urged leftward by a compression spring 26, that is, leftward by the photographing optical axis.
[0058]
A friction member 27 that contacts the outer periphery of the outer cylinder 52 of the lens barrel unit 51 is arranged in an arc shape at the lens barrel unit insertion portion of the camera body 1.
[0059]
Next, the configuration of the lens barrel unit 51 will be described. In the lens barrel unit 51, a movable barrel 54 is disposed inside an outer barrel 52 so as to be movable in the optical axis direction. The front lens group 81 is fixedly held in the movable cylinder 54. Similarly, the shutter 55 is also fixed to the movable barrel 54. Shutter 55 includes shutter blade 55a. The rear group lens 83 behind the shutter blade 55a is held in a rear group lens chamber 84, and the rear group lens chamber 84 is fixed to the movable cylinder 54.
[0060]
A male helicoid screw 54a is formed on the outer periphery of the rear end of the movable cylinder 54, and is screwed with a female helicoid screw 53b formed on the inner periphery of the rotary cylinder 53. The outer periphery of the rotating cylinder 53 is rotatably supported in the outer cylinder 52, and is immovably supported by the outer cylinder 52 and the decorative plate 56 in the optical axis direction. A lens barrel gear 53a is provided on the outer periphery of the rear end of the rotary cylinder 53.
[0061]
The decoration plate 56 is provided with a straight key 56 a, which is in contact with a key groove 84 a provided in the rear lens chamber 84. Therefore, when the rotary cylinder 53 rotates, the rotation of the movable cylinder 54 is restricted by the rectilinear key 56a and the key groove 84a, and the movable cylinder 54 advances and retreats in the optical axis direction by the helicoid screw.
[0062]
The decoration plate 56 is provided with the above-mentioned lens barrel switch KYS. The lens barrel switch KYS is in contact with one end 84b of the rear lens chamber 84 when the movable cylinder 54 is housed inside the outer cylinder 52.
[0063]
Extending from the shutter 55 is a flexible printed circuit (FPC) 59 for transmitting a signal related to shutter drive. The elements of the nonvolatile storage device 58 are mounted on the FPC 59. In the nonvolatile storage device 58, information on the photographic lens, such as the focal length of the photographic lens, the F number, and the amount of extension, is written. The FPC 59 is once guided to the front of the camera, folded back at the tip of the rectilinear key 56a, extended to the rear end of the decorative plate 56, and joined. The FPC 59 has a communication pattern 59 a at a position facing the contact pins 11 of the camera body 1 at the rear end of the decorative plate 56.
[0064]
In the present embodiment, the rotation limiting pin 52a and the cam pin 52b are provided on the outer circumference of the outer cylinder 52 at three places (three sets) on the circumference. The three sets of pins are arranged at different angular intervals on the circumference of the outer cylinder 52, and are configured to limit the mounting angle position of the lens barrel unit 51 to one. However, one set of rotation limiting pins 52a and cam pins 52b are arranged at the same angle.
[0065]
Next, a process of attaching the lens barrel unit 51 having the above configuration to the camera body 1 will be described. In this description, reference is also made to FIGS. 4 to 8 and FIGS. 9 to 12 which are developed views showing the operation of the detachable ring 8 during the mounting process of the lens barrel unit.
[0066]
FIGS. 4 and 9 both show a state in which the detachable lever 9 is at the “CLOSE” position and the lens barrel unit 51 is detached from the camera body 1. In this state, as shown in FIG. 9, the barrier 28 is closed, and the rotation restricting groove 1a of the camera body 1 and one end 8c of the cam groove of the detachable ring 8 are at positions shifted from each other.
[0067]
In this state, when the detachable lever 9 is slid from the “CLOSE” position to the “INSERT” position, the barrier 28 is opened by a mechanism described later. Further, the detachable ring 8 rotates in response to the movement of the detachable lever 9, and as shown in FIG. 10, one end 8c of the cam groove of the detachable ring 8 and the rotation restricting groove 1a of the camera body 1 are aligned on a straight line. .
[0068]
Therefore, in this state, when the lens barrel unit 51 is inserted into the camera body 1, the cam pins 52 b of the outer barrel 52 of the lens barrel unit 51 pass through the rotation limiting grooves 1 a of the camera body 1, and It reaches one end 8c of the spiral cam groove 8a. The rotation limiting pin 52 a of the outer cylinder 52 of the lens barrel unit 51 reaches one end 1 c of the rotation limiting groove 1 a of the camera body 1. 5 and 10 show this state. At this time, since the outer periphery of the outer cylinder 52 is held by the friction member 27, the lens barrel unit 51 does not easily fall off.
[0069]
Next, when the attachment / detachment lever 9 is slid from the “INSERT” position to the “ON” position, the attachment / detachment ring 8 is further moved rightward on the paper as shown in FIG. Accordingly, the cam pin 52b of the outer cylinder 52 of the lens barrel unit 51 moves along the slope 8d of the cam groove of the attachment / detachment ring 8, and reaches the fixed position 8e. At this time, since the rotation limiting pin 52a of the outer cylinder 52 is engaged with the rotation limiting groove 1a of the camera body 1, the outer cylinder 52 does not rotate and moves only in the optical axis direction. That is, the lens barrel unit 51 is retracted in the optical axis direction without rotating. 6 and 11 show this state.
[0070]
During this collapsing process, the barrel gear 53a of the rotating barrel 53 of the lens barrel unit 51 engages with the coupling gear 25 on the camera body side. At this time, even if the tip of the lens barrel gear 53a and the tooth tip of the coupling gear 25 interfere with each other, the coupling gear 25 escapes due to the action of the compression spring 26, and the lens barrel motor 21 rotates, so that normal engagement is obtained. Can be
[0071]
In conjunction with the completion of the collapse of the lens barrel unit 51 as described above, the light-shielding blade 13 covering the aperture 12 is retracted by a mechanism described later, as shown in FIG. .
[0072]
When the collapse of the lens barrel unit 51 is completed in this way, the communication pattern 59a provided on the decorative plate 56 of the lens barrel unit 51 comes into contact with the contact pins 11 provided on the camera body side. In response to this contact, the control circuit 40 reads the lens information such as the focal length, the F number, the extension amount, and the like from the nonvolatile storage device 58 of the lens barrel unit 51 as described above. Then, the control circuit 40 drives the lens barrel motor 21 based on the lens information and the like, and draws out the movable barrel 54 of the lens barrel unit 51, that is, the photographing lenses 81 and 83, by the above-described mechanism. By the start of the extension, the end surface 84b of the rear lens group chamber 84 that has been in contact with the lens barrel switch KYS is separated from the lens barrel switch KYS, and the lens barrel switch KYS is operated. The control circuit 40 calculates the amount of extension of the lens from the operation signal of the lens barrel switch KYS and the pulse count value of the photo interrupter 23, and stops the movable cylinder 54 at a predetermined shooting preparation position. FIG. 7 shows this state.
[0073]
When the release button 3 (FIG. 1) is half-pressed in this state, the half-press switch S1 (FIG. 3) is turned on, and the subject distance is measured by the distance measuring device 41. The control circuit 40 calculates the extension amount of the lens based on the measurement information of the subject distance from the distance measuring device 41, and controls the driving of the lens barrel motor 21 to move the movable cylinder 54 to a predetermined position corresponding to the extension amount. Let it. When the full-press switch S2 (FIG. 3) is further turned on, the brightness of the subject is measured by the photometric device 42, and the shutter 55 is operated to perform exposure. Thereafter, if necessary, the movable cylinder 54 is returned to the photographing preparation position, and the film feeding device 43 winds up the film by one frame.
[0074]
When the detachable lever 9 is slid from the “ON” position to the “OFF” position after the photographing is completed, the lens barrel motor 21 is driven, and the movable barrel 54 is collapsed. Further, the barrier 28 is closed by a mechanism described later and covers the front surface of the movable cylinder 54. 8 and 12 show this state.
[0075]
In this case, the cam pin 52b of the lens barrel unit 51 reaches the fixing position 8e of the attachment / detachment ring 8 from the fixing position 8e, but the position in the optical axis direction does not change.
[0076]
When removing the lens barrel unit 51 from the camera body 1, the detachable lever 9 is slid from the "OFF" position or the "ON" position to the "INSERT" position. As a result, the lens barrel unit 51 is returned to the mounting preparation position as shown in FIGS. 5 and 10 by an operation reverse to the above-described method, and becomes detachable.
[0077]
Then, after the lens barrel unit 51 is manually removed, when the detachable lever 9 is slid from the “INSERT” position to the “CLOSE” position, the barrier 28 closes the lens barrel insertion portion opening by a mechanism described later. This state is as shown in FIGS.
[0078]
Next, the details of the drive mechanism of the barrier 28 and the light shielding blade 13 will be described corresponding to each position of the detachable lever 9 and the like. FIGS. 13 to 16 show the states of the drive mechanism of the barrier 28 and the light shielding blade 13 when the detachable lever 9 is at the “CLOSE” position, the “INSERT” position, the “ON” position, and the “OFF” position, respectively. FIG.
[0079]
That is, FIG. 13 corresponds to FIGS. 4 and 9 and shows a state where the detachable lever 9 is at the “CLOSE” position. The light-shielding blade 13 is composed of three blades 14, 15, 16 and shields the aperture 12 from light. Each of the blades 14, 15, 16 is rotatably supported by two parallel links 17 and 18 by rotating shafts 14a, 14b; 15a, 15b; 16a, 16b. The parallel links 17 and 18 are rotatably supported on shafts 17a and 18a, respectively.
[0080]
A pin 18b is implanted in one of the two parallel links 17 and 18. The parallel link 18 is urged clockwise about a shaft 18a by a spring (not shown). Therefore, the pin 18b is in contact with the cam surface 9d of the cam 9c of the detachable lever 9, and the parallel links 17, 18 are held at the positions shown in FIG. Reference numerals 14, 15, and 16 maintain the state in which the aperture 12 is shielded from light.
[0081]
On the other hand, the barrier 28 is rotatably supported about a shaft 28a, and is urged clockwise about the shaft 28a by a spring (not shown). An arm 28b extends from the barrier 28, and the arm 28b is in contact with an arm 29b that hangs vertically from a first lever 29 that is rotatably supported about a shaft 29a. The second lever 30 is rotatably supported coaxially with the rotation shaft 29a of the first lever 29.
[0082]
A torsion spring 31 is supported between the first lever 29 and the second lever 30 around the rotation shaft 29a. One end 31a of the torsion spring 31 contacts the arm 29b of the first lever 29, and The end 31b is in contact with the arm 30a rising from the second lever 30. Therefore, the arm 29c of the first lever 29 and the arm 30a of the second lever 30 are held in contact with each other. That is, the first lever 29 and the second lever 30 rotate integrally by the torsion spring 31. The second lever 30 has a pin 30b implanted therein and is engaged with the cam groove 9j of the cam portion 9h of the detachable lever 9. As described later, the cam groove 9j moves the pin 30b of the second lever 30 in the direction of the light-shielding blade 13 in response to the movement of the detachable lever 9 in the direction of arrow A, and then moves the pin 30b a certain distance from the light-shielding blade 13. , And its shape is defined so as to keep it away from the light shielding blade 13. Therefore, in the state shown in FIG. 13, the pin 30b of the second lever 30 is located at a position away from the light shielding blade 13, and the arm 29b of the first lever 29 does not press or almost presses the arm 28b of the barrier 28. The barrier 28 is located at a position where the opening of the insertion portion of the lens barrel unit is closed by a spring (not shown).
[0083]
When the barrier 28 is moved to the open side by an external force in this state, only the arm 28b of the barrier 28 is disengaged from the arm 29b of the first lever 29, and the mechanical parts are destroyed. There is no.
[0084]
A switch encoder 10 is disposed on the detachable lever 9. The switch encoder 10 includes patterns 10a, 10b, and 10c fixed on the detachable lever 9 and formed on an insulating substrate, and a brush 9b that slides on these patterns. The pattern 10a is a ground (GND) pattern, and the patterns 10b and 10c are signal patterns. The GND pattern 10a and the signal patterns 10b and 10c are made conductive by the brush 9b, and a signal corresponding to the conductive state is transmitted to the control circuit 40.
[0085]
In the state of FIG. 13, the signal pattern 10b is non-conductive to the GND pattern 10a, and the signal pattern 10c is conductive to the GND pattern 10a. Therefore, the control circuit 40 detects this conduction state and recognizes that the lens barrel unit 51 is not mounted and the barrier 28 is closed.
[0086]
Next, when the detachable lever 9 is slid from the “CLOSE” position to the “INSERT” position, that is, when the detachable lever 9 is moved in the direction of arrow A in FIG. 13, the pin 30 b of the second lever 30 moves along the cam portion 9 h of the detachable lever 9. And moves to the position 9k of the cam groove. In response, the second lever 30 rotates counterclockwise around the rotation shaft 29a, and the first lever 29 also rotates counterclockwise via the torsion spring 31. Then, since the arm 29b of the first lever 29 pushes the arm 28b of the barrier 28, the barrier 28 rotates counterclockwise around the rotation axis 28a and retreats from the insertion portion of the lens barrel unit 51.
[0087]
In this process, the pin 18b implanted in the parallel link 18 is in contact with the cam surface 9e of the cam 9c, but the height of the cam surface 9e does not change, so that the light-shielding blades 13 maintain the state where the aperture 12 is shielded from light. I do.
[0088]
Further, the brush 9b is in a conductive state with the ground pattern 10a in both the signal patterns 10b and 10c, and the control circuit 40 recognizes that the lens barrel unit 51 is in the mounting preparation position and the barrier 28 is opened. FIG. 14 shows the state at this time.
[0089]
Next, after inserting the lens barrel unit into the camera body 1 as described above, the detachable lever 9 is slid from the “INSERT” position to the “ON” position. That is, when the detachable lever 9 is moved in the direction of arrow A in FIG. 14, the pin 30b of the second lever 30 moves along the cam portion 9h of the detachable lever 9, and moves to the cam groove position 9m. At this time, since the height of the cam portion 9h does not change, the second lever 30 does not rotate, so that the first lever 29 and the barrier 28 do not rotate, and the barrier 28 maintains the open state. This state is shown in FIG.
[0090]
On the other hand, the pin 18b implanted on the parallel link 18 moves on the cam surface 9f of the cam 9c. As a result, the height of the cam surface is reduced, so that the parallel links 17, 18 rotate around the rotation shafts 17a, 18a, respectively, and the blade members 14, 15, 16 retract from the aperture 12.
[0091]
In this state, in the brush 9b, the signal pattern 10b is electrically connected to the ground pattern 10a, and the signal pattern 10c is not electrically connected to the ground pattern 10a. Thereby, the control circuit 40 recognizes that the lens barrel unit 51 is mounted and the barrier 28 is opened. Therefore, when receiving the signal corresponding to the state of the signal pattern, the control circuit 40 drives the lens barrel motor 21 to extend the movable barrel 54 of the lens barrel unit 51 to a predetermined shooting preparation position as described above. .
[0092]
Next, the detachable lever 9 is further moved in the direction of arrow A in FIG. 15, and is slid from the “ON” position to the “OFF” position. As a result, the signal patterns 10b and 10c of the switch encoder 10 are both electrically disconnected from the ground pattern 10a. Upon receiving a signal corresponding to this state, the control circuit 40 drives the lens barrel motor 21 to retract the movable barrel 54 of the lens barrel unit 51.
[0093]
Further, in response to the movement of the detachable lever 9, the pin 30b of the second lever 30 moves along the cam portion 9h of the detachable lever 9, and moves to the cam groove position 9n. Thus, the second lever 30 rotates clockwise around the rotation axis 29a, the arm 30a of the second lever 30 pushes the arm 29c of the first lever 29, and the first lever 29 also rotates clockwise. . Thus, the pressing force applied to the arm 28b of the barrier 28 by the arm 29b of the first lever 29 is released. Therefore, the barrier 28 rotates clockwise around the rotation shaft 28 a by the urging force of a spring (not shown), and closes the insertion portion of the lens barrel unit 51.
[0094]
In this process, the pin 18b implanted in the parallel link 18 is in contact with the cam surface 9f of the cam 9c, but its height does not change, so that the light shielding blade 13 keeps the state in which the aperture 12 is opened. FIG. 16 shows this state.
[0095]
When the detachable lever 9 is moved from the "OFF" position to the "CLOSE" position in the opposite direction to the above, the reverse operation is performed.
[0096]
In the above embodiment, the light-blocking blade 13 is open when the lens barrel is mounted. However, the light-blocking blade 13 is used, for example, when the movable barrel 54 of the lens barrel unit 51 is extended to prepare for photographing. If only the door is opened and the door is closed in other cases, the light shielding property is further improved.
[0097]
The movable devices such as the detachable ring 8 and the detachable lever 9 are not limited to manual operation, and may be moved using an electric drive source such as a motor.
[0098]
【The invention's effect】
As described above, according to the present invention, in the interchangeable lens camera, the barrier built into the camera body is configured to cover the opening of the insertion portion of the lens barrel unit. In addition, it is possible to prevent intrusion of dust and the like into the camera body and adverse effects due to external force, thereby realizing a highly reliable lens interchangeable camera. Further, since a separate device such as a conventional body cap or a lens cap is not used, the convenience in handling the camera is increased, and the possibility of the body cap or the like being lost is eliminated.
[0099]
Furthermore, since the operation of the barrier is configured to be performed in conjunction with the movable mechanism for fixing the lens barrel unit, the operation of opening and closing the insertion portion opening of the lens barrel unit is automatically performed, and the operability is extremely high. A camera can be realized.
[0100]
Further, since the barrier is closed except during photographing, double blocking is performed by the shutter blades and the barrier of the lens when the lens is mounted, and double blocking is performed by the light blocking blade and the barrier when the lens is not mounted.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of an interchangeable lens camera according to one embodiment of the present invention.
FIG. 2 is a plan view showing the state of the bottom surface of the interchangeable lens camera of FIG. 1;
FIG. 3 is a block circuit diagram showing an electrical configuration of the interchangeable lens camera of FIG. 1;
4 is a cross-sectional view showing a state before the lens barrel unit of the interchangeable lens camera of FIG. 1 is mounted.
FIG. 5 is a cross-sectional view showing a state where the lens barrel unit of the interchangeable lens camera of FIG. 1 is ready for mounting.
FIG. 6 is a cross-sectional view showing a state where the lens barrel unit of the interchangeable lens camera of FIG. 1 is fixed.
7 is a cross-sectional view showing a state where the lens barrel unit is fixed and photographing preparation is performed in the interchangeable lens camera of FIG. 1;
FIG. 8 is a cross-sectional view showing a state where the lens barrel unit is fixed and the barrier is closed in the interchangeable lens camera of FIG.
9 is a developed view showing a positional relationship of a detachable ring at the time of “CLOSE” of the interchangeable lens camera of FIG. 1;
10 is a developed view showing a positional relationship of a detachable ring at the time of “INSERT” in the interchangeable lens camera of FIG. 1;
FIG. 11 is a developed view showing a positional relationship of a detachable ring when the camera is “ON” in the interchangeable lens camera of FIG. 1;
12 is a development view showing a positional relationship of a detachable ring when the interchangeable lens camera of FIG. 1 is “OFF”.
FIG. 13 is a perspective view showing an operation state of the barrier and the light shielding blade at the time of “CLOSE” of the interchangeable lens camera of FIG. 1;
FIG. 14 is a perspective view showing an operation state of the barrier and the light shielding blade at the time of “INSERT” of the interchangeable lens camera of FIG. 1;
FIG. 15 is a perspective view showing an operation state of a barrier and light shielding blades when the interchangeable lens type camera of FIG. 1 is “ON”.
FIG. 16 is a perspective view showing an operation state of a barrier and light shielding blades when the interchangeable lens camera of FIG. 1 is “OFF”.
[Explanation of symbols]
1 Camera body
1a Rotation limit groove
8 Removable ring
8a Cam groove
9 Removable lever
9b brush
9c cam
9h Barrier cam
10 Switch encoder
11 Contact pin
12 Aperture
13 Shading feather
17,18 parallel link
21 Lens tube motor
23 Photo interrupter
25 Coupling gear
28 Barrier
29 1st lever
30 Second lever
51 Lens barrel unit
52 outer cylinder
53 rotating cylinder
53a lens barrel gear
54 movable cylinder
55 shutter
58 Nonvolatile storage device
81 Front group lens
83 Rear lens group
S1 Half-press switch
S2 full push switch
KYS lens barrel switch

Claims (18)

An interchangeable lens camera using a lens barrel unit having a shooting lens attached to a camera body,
A movable mechanism for fixing the lens barrel unit to a camera body,
A barrier covering a front surface of the lens barrel unit insertion portion,
Comprising, at least the movable mechanism,
A first position in which the barrier is opened and the lens barrel unit is detachably attached to a camera body;
A second position for closing the barrier when the lens barrel unit is not mounted;
An interchangeable lens type camera comprising: 2. The interchangeable lens camera according to claim 1, wherein the movable mechanism further includes a third position in which the barrier is opened when the lens barrel unit is mounted. 3. The interchangeable lens camera according to claim 2, wherein in the third position of the movable mechanism, the photographing lens of the lens barrel unit is further extended to a photographing position to prepare for photographing. . The interchangeable lens camera according to any one of claims 1 to 3, wherein the movable mechanism further has a fourth position for closing the barrier when the lens barrel unit is mounted. The interchangeable lens camera according to claim 4, wherein the barrier covers the front surface of the lens barrel unit when the movable mechanism is at the fourth position. 2. A light-shielding device for shielding an exposure opening from light, wherein the light-shielding device is opened and closed according to attachment and detachment of the lens barrel unit when the movable mechanism is at the first position. 6. The interchangeable lens camera according to any one of items 1 to 5. The movable mechanism,
A lens detachable lever,
A detachable ring that rotates in conjunction with the lens detachable lever and has a cam groove engageable with a cam pin of the lens barrel unit;
When the lens barrel unit is mounted on the camera body, the cam pins of the lens barrel unit engage with the cam grooves of the detachable ring, and the lens barrel unit is moved in accordance with the movement of the lens detachable lever. 2. The interchangeable lens camera according to claim 1, wherein the camera performs a movement defined by the cam groove. Further, the camera has a rotation restricting groove disposed on the camera body, and when the movable mechanism is at the first position, the rotation restricting groove and the cam groove of the detachable ring are aligned, The camera according to claim 7, wherein a cam pin of the lens barrel unit can be inserted into the cam groove. The interchangeable lens camera according to claim 7, wherein the barrier is opened and closed in conjunction with the movement of the lens detachable lever. An interchangeable lens camera using a lens barrel unit having a shooting lens attached to a camera body,
A movable mechanism for fixing the lens barrel unit to a camera body,
A barrier covering a front surface of the lens barrel unit insertion portion,
Comprising, at least the movable mechanism,
A first position in which the barrier is opened and the lens barrel unit is detachably attached to a camera body;
A second position for closing the barrier with the lens barrel unit mounted;
An interchangeable lens type camera comprising: 11. The interchangeable lens camera according to claim 10, wherein the movable mechanism further includes a third position in which the barrier is opened when the lens barrel unit is mounted. 12. The interchangeable lens camera according to claim 11, wherein in the third position of the movable mechanism, the photographing lens of the lens barrel unit is further extended to a photographing position to prepare for photographing. . The interchangeable lens camera according to claim 10, wherein the barrier covers the front surface of the lens barrel unit when the movable mechanism is in the second position. 11. A light-shielding device for shielding an exposure opening from light, wherein the light-shielding device is opened and closed according to attachment and detachment of the lens barrel unit when the movable mechanism is at the first position. 14. The interchangeable lens camera according to any one of items 13 to 13. The movable mechanism,
A lens detachable lever,
A detachable ring that rotates in conjunction with the lens detachable lever and has a cam groove engageable with a cam pin of the lens barrel unit;
When the lens barrel unit is mounted on the camera body, the cam pins of the lens barrel unit engage with the cam grooves of the detachable ring, and the lens barrel unit is moved in accordance with the movement of the lens detachable lever. 11. The interchangeable lens camera according to claim 10, wherein the camera performs a movement defined by the cam groove. Further, the camera has a rotation restricting groove disposed on the camera body, and when the movable mechanism is at the first position, the rotation restricting groove and the cam groove of the detachable ring are aligned, The interchangeable lens camera according to claim 15, wherein a cam pin of the lens barrel unit can be inserted into the cam groove. The cam groove of the detachable ring mounts the lens barrel unit when the movable mechanism is at the first position, and retracts and fixes the lens barrel unit when the movable mechanism is switched to the second position. 17. The camera according to claim 15, wherein the camera has a helical cam groove portion. 16. The interchangeable lens camera according to claim 15, wherein the barrier is opened and closed in conjunction with the movement of the lens detachable lever.

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