JPH0690385B2 - Motor drive camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a motor configured to efficiently incorporate and arrange a drive system from a motor for performing mirror-up drive, film winding, shutter charge, etc. in a camera body. Regarding improvement of drive camera.

[Conventional technology]

The recent single-lens reflex cameras are remarkably multifunctional, and it is necessary to greatly improve the quick-shooting property and the operability by automating these functions as much as possible. As a device that can satisfy such a point, a motor drive camera that automatically carries out shooting operations such as mirror-up, film winding and shutter charging by incorporating a motor in the camera body is becoming popular. The applicant of the present invention also discloses, for example, JP-A-53-141615 and JP-A-57-9963.
A device having a configuration as shown in Japanese Patent Publication No. 0 has been already proposed.

[Problems to be solved by the invention]

However, according to the above-described conventional motor drive camera, the number of constituent parts is large, the structure is complicated, and there is a problem in terms of assembling, and a space for incorporating the motor and its drive system is required to some extent. Therefore, there is a possibility that the entire camera body may be increased in size. Therefore, the motor and its drive system described above are made to have a compact structure, and some measures are taken to make it possible to efficiently assemble them into the camera body. Is needed.

That is, in the above-mentioned conventional apparatus, the output shaft of the motor is pulled out above and below the camera body, and these are used as drive sources for driving the film winding mechanism and the mirror-up mechanism arranged on the camera body and on the lower side, respectively. With such a structure, the use of the clutch mechanism etc. can be minimized and the operational reliability of each part can be secured to some extent, but the number of constituent parts increases, problems in terms of assemblability, etc. Since there are many parts involved in the transmission of the driving force of the motor, there is a problem in downsizing the motor. Further, in this type of motor drive camera, it is necessary to provide a battery storage portion for driving the motor in the lower portion of the body, and in the conventional configuration in which the output shaft is also drawn out from the lower end of the motor, it is possible to avoid increasing the overall size. It was not possible and was a serious problem in practical use.

In particular, in this type of motor drive camera, the links that make up the shutter charge mechanism and the mirror-up mechanism, and the end part of the lever system are efficiently incorporated into the side of the mirror box to make them compact and simplify the structure. It is desired to achieve the above, and this greatly affects the reduction of the load on the motor, and these points must be taken into consideration.

[Means for solving problems]

In order to meet such a demand, the motor drive camera according to the present invention has a slide lever that is driven from the lower side of the mirror box side when the motor rotates in the forward direction, and has a lower end connected to the slide lever and always rotates integrally with a spring. And a first and a second mirror up lever having a double lever structure so that the mirror can be moved up, a mirror up lever system is formed, and a first side rotated from the upper side of the side of the mirror box when the motor is rotated in reverse. Shutter, a second link lever extending downward without interfering with the second mirror up lever, and a rotatable third link lever having a shutter charge pin at the other end. A charge link system is configured, and its shutter charge pin is locked and held in the shutter charged state, and the mirror It is obtained so as to attaching a set lever to the locked state is released by engagement with the slide lever in the movement end at.

[Action]

According to the present invention, mirror up and shutter charge are required by selectively driving the slide lever on the mirror up side and the first link lever on the shutter charge side selectively by the rotational force of the motor in both the forward and reverse directions. It is possible to efficiently drive the mirror box side mechanism part and to make it compact because the lever and link structure is simple.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 to 8 show one embodiment of a motor drive camera according to the present invention. In these drawings, first, a schematic structure of a motor drive camera, which is generally designated by reference numeral 1, is shown in FIG.
Briefly explaining with reference to the drawings, reference numeral 2 is a film take-up spool arranged on the left side in the figure of the camera body 1a whose external appearance is shown by an imaginary line. A film (not shown) pulled out from the cartridge 4 loaded on the rewinding shaft 3 provided on the right side of the body 1a is sequentially wound according to the winding operation. In the figure, 1b is a battery housing integrally attached to the lower part of the camera body 1a, and 5 is a camera body.
In the mirror box arranged in the central portion of 1a, further, in this embodiment, the rewind shaft 3 described above is configured to be independently rotatable by a small motor 6 arranged above it. ing.

The shutter mechanism 7 disposed behind the mirror box 5 runs on the frame 7a as shown in FIG. 2 when the hold state by the magnet is released and the front curtain and the rear curtain (see FIG. 8) in the figure.
Is a shutter set lever that is brought into a charged state by being pushed up in a direction indicated by an arrow in the drawing by a charge pin of a shutter charge mechanism described later.

According to the motor drive camera 1 of this embodiment, as shown in FIG. 1 and further FIGS. 3 to 6, the output shaft 10a is incorporated in the film take-up spool 2 and the output shaft 10a is attached to the camera body 1a. A motor 10 protruding upward and rotatable in both the forward and reverse directions, an upper unit 12 provided on the upper side of the camera body 1a having a reduction gear train 11 for transmitting the rotational force thereof, and facing the motor. A lower unit 14 arranged below the mirror box 5 to transmit the rotational force of the motor 10 that is decelerated by the reduction gear train 11 through a rotation transmission shaft 13 that is provided so as to hang down from the upper unit 12, A side unit 15 is arranged between the upper and lower units 12 and 14 on the side of the mirror box 5. Then, in the middle of the reduction gear train 11 in the upper unit 12, the members constituting the film winding mechanism 17 and the shirt charging mechanism 18 which are selectively connected via the one-way clutch 16 are appropriately arranged. , Lower unit 14
Is provided with a member that constitutes a mirror-up mechanism 19 that raises a mirror (not shown) in the mirror box 5 against the return habit by a spring or the like according to the rotation direction of the motor 10. The unit unit 15 is appropriately provided with links and lever systems that constitute the shutter charge mechanism 18 and the mirror-up mechanism 19.

This will be described in detail with reference to FIG. 3 and subsequent figures. First, the reduction gear train 11 includes a gear 11a provided on the output shaft 10a of the motor 10 in the upper unit 12 shown in FIG. A plurality of stepped gears 11b, 11c, 11d, 11e arranged so as to surround
And the large gear 2 of the large and small gears 20a, 20b incorporating the one-way clutch 16 (for example, a ball clutch).
As is apparent from FIG. 5, the large gear 20a is constituted by 0a and meshes with the gear 13a provided on the rotation transmission shaft 13 to rotate the motor 10 in both forward and reverse directions. The configuration is such that it is transmitted to the mirror-up mechanism 19 (see FIGS. 6 and 4) on the lower unit 14 side to perform the required mirror-up operation. The arrow a shown by the solid line in FIG. 3 indicates the rotation direction of each part when the motor 10 rotates in the normal direction,
An arrow b indicated by a broken line is a rotation direction at the time of reverse rotation, and 12a and 12b in FIG.
It is a base plate.

On the other hand, the small gear 20b that is selectively connected to the reduction gear train 11 via the one-way clutch 16 is configured to be rotationally driven only when the motor 10 rotates in the reverse direction. The film winding mechanism 17 and the shutter charge mechanism 18 are appropriately driven by the gears 21 and 22 meshing with. That is, reference numerals 23 and 24 in FIG. 3 denote a sprocket gear and a spool gear for feeding the film top, which mesh with a gear 21 constituting the film winding mechanism 17, whereby the film is wound one by one onto the spool 2. Reference numeral 21a in the figure is a claw lever for preventing reverse rotation. Then, in such a configuration, it will be apparent that the film winding operation is automatically performed when the motor 10 is rotated in the reverse direction.

Further, the gear 22 meshes with a gear 26 that is integral with a charge cam 25 that constitutes the shutter charge mechanism 18, and is configured to perform shutter charge when the motor 10 rotates in the reverse direction. That is, 27 and 28 in the figure are first and second set levers which are rotated in the required direction by the charge cam 25, and the tip 28a of the second set lever 28 is the side unit shown in FIG. An engaging pin 29 projecting from one end of a first link lever 29 provided on the upper end portion side of 15
The shutter is charged by engaging with a and rotating it.

The link configuration on the side unit 15 side will be described with reference to FIG. 4. In the figure, 30 is the second link lever pivotally supported at the other end of the first link lever 29, and 31 is the other end. A third link lever having one end pivotally supported at the other end and a shutter charge pin 32 at the other end.
In FIG. 2, chatter charge is performed by pressing the shutter set lever 8. In addition,
In the figure, 33 is a main plate of the side unit 15, 34 is a spring for urging the first link lever 29 counterclockwise in the figure via a support shaft 29b, 31a is a support shaft of the third link lever 31, and 30a. , 30b are connecting pins at both ends of the second link lever 30. further,
In the figure, reference numeral 35 denotes a set lever pivotally supported on the main plate 33 via a support shaft 35a and constantly urged in a counterclockwise direction by a spring 36, and the shutter charge pin 32 is locked by a locking portion 35b of the set lever 35. The shutter charge state is maintained by locking the shutter lever, and the other end 35c of this set lever 35 is pressed by a part of the lever system on the mirror-up mechanism 18 side described later. Thus, the locked state is released in the vicinity of the mirror-up operation end portion.

In FIG. 3, reference numeral 37 is a switch lever for turning on and off a timing switch 38 for sending a stop signal of the motor 10, which is constantly urged counterclockwise by a spring 37a and also has a second set lever. An engaging pin 28b provided on a part of 28 is rotated clockwise when the mirror is raised to turn on the switch 38. Furthermore, this switch lever
The claw portion 37b formed at the tip of 37 is the charge cam 2
The disk 26a integrally formed with the gear 5 and the gear 26 is configured to mesh with a notch 26b formed in the peripheral edge of the disk 26a in a shutter charge state. Reference numeral 39 in the drawing is a lever for controlling the diaphragm mechanism (not shown) side in conjunction with the movement of the other end 27a of the first set lever 27.

On the other hand, the mirror-up mechanism 19 provided in the lower unit 14 is provided with gear trains 40a, 40b, 40c which mesh with a gear 13b provided at the lower end of the rotation transmission shaft 13 as shown in FIG. A ratchet gear 42 provided on the gear 41 to which the rotational force of the motor 10 is transmitted, and an engagement pin 43a that engages with a plurality of cam grooves 42a provided in the circumferential direction of the ratchet gear 42. A ratchet arm 43 and a mirror lever 44 provided with a support shaft 43b of the arm 43 are provided. In the figure, 42b is a support shaft of the ratchet gear 42, 44a is a support shaft of the mirror lever 44, 45 is a spring for urging the lever 44 in the clockwise direction in the figure, and 46 is the imaginary line of the arm 43 in the figure. Is a locking pin that locks in the mirror-up state, and 47a is an engaging end of the mirror-up slide lever 47 on the side unit 15 side.

According to this structure, when the motor 10 rotates in the normal direction, the ratchet gear 42 rotates in the direction a in the figure to push the mirror 43 against the biasing force by the arm 43 pushed out through the engagement pin 43a. When the lever 44 is rotated, the mirror-up described later is performed, and at the end portion thereof, as shown by an imaginary line in the drawing, the engagement pin 43 of the arm 43 is
The part a crosses over the line segment (dead point) connecting the support shaft 42b of the ratchet gear 42 and the arm support shaft 43b, and the arm 43 is locked and held in the bite state, so that the mirror-up state is maintained. is there. In addition, the motor 10
When the rotation is reversed, the engaging pin 43a portion of the arm 43 is assisted by the urging force of the spring 45 to get over the dead point in reverse, and as a result, the mirror lever 44 is returned to the original state shown by the solid line in the figure. Is.

On the other hand, the mirror-up mechanism 19 on the side unit 15 side is the fourth
As shown in the figure, the first and second mirror up levers as double levers are rotatably supported on the main plate 33 about a support shaft 48 at the center in the height direction and always rotate integrally. 49 and 50, which are biased in opposite directions by the biasing force of the spring 51. That is, the first mirror up lever 49 is on the left below the main plate 33,
By being connected to the other end of the slide lever 47, which is slidably supported to the right, one end 51
The spring 51 which is locked a is urged in the counterclockwise direction in the figure. On the other hand, the lower end portion 50a is engaged with the protruding engagement portion 49a of the first mirror up lever 49, and the upper end portion 50b is projected from the arcuate groove 52 formed on the main plate 33. The second mirror up lever 50 extending so as to face the non-mirror side pin 53 is locked at the other end 51b of the spring 51, so that the support shaft 48 is centered in the clockwise direction in the figure. Is being urged, which makes this second
The mirror up lever 50 is engaged with the engaging portion 49a and is always rotated integrally with the first mirror up lever 49.

Here, the spring 51 is mounted by being wound around a boss portion 50c protruding from a part of the second mirror up lever 50. It will be readily appreciated that the shaft 48 may be wound and mounted. Further, the lower end locking portion of the spring 51 described above is not limited to the illustrated example, and may be directly locked to the first mirror up lever 49. The upper end of the second mirror up lever 50 elastically supported by the other end 51b of the spring 51 as described above.
50b is configured to be able to move above the pin 53 on the mirror side, and when the mirror is raised, the spring 51 is bent so as to engage with the pin 53 and separate from the engaging portion 49a. The mirror is bound to be absorbed.

According to the motor drive camera 1 having the above-described configuration, the motor 10 incorporated in the spool 2 rotates in the forward direction by the release signal {see FIG. 9 (a)}, whereby the upper unit is transmitted via the rotation transmission shaft 13. Mirror up mechanism 19 arranged in lower and side units 14 and 15 connected to 12
Is operated as described above, the mirror is moved upward, and the shutter 7 which is charged in advance is interlocked with this operation.
Is to perform a shooting operation. That is, the FC signal and the SC magnet in the shutter mechanism 7 are generated by the release signal described above.
The magnets hold the front curtain and the rear curtain, respectively, and the slide lever end 47a releases the set lever 35 at the final point of the above-described mirror-up operation, so that the shutter can travel. Further, as a result, the shutter charge mechanism 18 which returns to the original state turns on the timing switch 38 incorporated therein, thereby stopping the rotation of the motor 10 and at the same time, from the signal thereof, Δt ₁ The first curtain starts at the time of delay, and then the second curtain starts after a predetermined time delay, and a series of exposure operations are performed.

Then, the motor 10 starts reverse rotation with a delay of Δt ₂ from the time when the trailing curtain starts, which causes the mirror up mechanism.
The mirror-up state in which the ratchet arm 43 is engaged and held at 19 is released, and the mirror is lowered by the recovery spring attached to itself. When the motor 10 rotates in the reverse direction, the film winding mechanism 17 and the shutter charge mechanism 18 are connected to the motor 10 via the one-way clutch 16 to perform the film winding operation and set by rotating the charge cam 25. The shutter charges are performed by the action of the levers 27, 28 and the link levers 29, 30, 31.
The shutter charge state is maintained as a release waiting state by engaging the claw portion 37b of the switch lever 37 with the notch 26b on the charge cam 25 side, and the switch 38 is turned off at this time. Then, as shown in FIG. 9 (a), the motor 10 is stopped and a series of photographing operations are performed.

In the motor drive camera 1 having the above-described structure, when the film is rewound, the sprocket gear 23 and the spool gear 24 (see FIG. 3) involved in the rotation of the film should be separated from the rotation transmission system of the motor 10. Is required. Therefore, according to this embodiment, by pressing the sprocket release button 60 shown in FIGS. 7 and 8, the spool 2 and the sprocket on the film side are pressed.
61 is a switch (not shown) which is set to a free state by disconnecting the gear 21a (see 21 in FIG. 3) connected to the motor 10 from the gear train, and is turned on in association with the pressing operation of the release button 60. Separate small motor 6 driven by signal
Thus, the supply spool side is rotationally driven to perform the film rewinding operation. Here, 21b in the figure is a gear that constantly meshes with the sprocket gear 23 and the spool gear 24, 62 is integrated with this gear 21b by caulking, and the engagement state with the gear 21a is released by pressing the button 60. Clutch plate, 63 is a spring receiver, 64 is a spring,
Also, 65 is a locking portion 60 that is recessed in a part of the release button 60 on the tip side.
A set lever 65a is a biasing spring for locking and holding the button 60 in a pressed state by engaging with a.
When the clutch plate 62 is disengaged by the release button 60, the clutch plate 62 is separated from the gear 21b on the spool 2 side by the button 60.
When the motor 10 side rotates again and the rotation is transmitted to the gear 21a side, the release button 60 also rotates to release the locked state, and as a result, the clutch plate 62 is joined. It returns to the normal state. The time chart at this time is shown in FIG. 9 (b).

Therefore, according to the motor drive camera 1 having the above-described configuration, by utilizing the rotational outputs of the motor 10 in both the forward and reverse directions, the load applied to the drive system can be appropriately and well-balanced, and the drive efficiency can be improved. In addition, a reduction gear train for performing mirror up during forward rotation, winding up during reverse rotation, and shutter charge operation
This is advantageous in that the motor 10 can be downsized because the 11 can be shared and the load is reduced. Further, as described above, when the motor 10 is assembled in the spool 2 and the output shaft 10a thereof is projected only above the body 1a, when the battery storage portion 1b or the like is attached to the lower side of the body 1a, It does not cause any hindrance, and aims to make the entire mechanism compact,
It is also possible to obtain an efficient arrangement state within the camera body 1a.

Particularly, according to the present invention, the first and second mirrors having the double lever structure which are always rotated integrally by the slide lever 47 and the spring 51 which are driven from the lower side of the mirror box 5 side when the motor 10 is normally rotated. The up levers 49 and 50 constitute a mirror up lever system, and the first link lever 2 which is rotated from the upper side of the side of the mirror box 5 when the motor is rotated in reverse
9, a second link lever 30 extending downward without interfering with the second mirror up lever 50, and a third link lever 31 having a shutter charge pin 32
Since the shutter charge link system is configured as described above, the configuration is simplified, and the overall structure is compact and efficient, and its advantages are great.

Further, in the above-described configuration according to the present invention, the set lever that holds and holds the shutter charge pin 32 in the shutter charged state and engages with the slide lever 47 at the end of movement when the mirror is up to release the locked state.
Since the shutter mechanism 7 is provided with a highly responsive shutter 35, if only one switch (38) for sending a stop signal of the motor 10 is attached to any one of the mechanism portions. It has the advantage of being good.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each portion can be freely modified or changed. For example, in the above-described embodiment, the case where the film rewinding is performed by using the small motor 6 installed in another place in the camera body 1a is shown, but the present invention is not limited to this, and the clutch etc. Of course, the rewinding operation may be performed by using the motor 10 in the spool 2 according to the present invention or by manual operation.

〔The invention's effect〕

As described above, according to the motor drive camera of the present invention, the slide lever that is driven from the lower side of the mirror box side when the motor is normally rotated and the double lever structure that is always rotated integrally by the spring are provided. And the second mirror up lever constitute a mirror up lever system, and on the other hand, the first link lever and the second mirror up lever which are rotated from the upper side of the mirror box side when the motor reverses are arranged so as not to interfere with each other. A shutter charge link system is configured by a second link lever provided and a third link lever having a shutter charge pin, and the shutter charge pin is locked and held in the shutter charge state to provide a slide lever at the end of movement when the mirror is raised. Since a set lever that engages with and releases the locked state is attached, is it easy? Despite the inexpensive structure, by selectively driving the mirror-up side slide lever and the shutter charge-side first link lever by the rotational force of the motor in both the forward and reverse directions, the mirror-up and shutter charge can be performed. Can be efficiently driven as required, and since the simple lever and link structure can be achieved, various advantageous effects such as a compact mirror box side mechanism part can be formed.

[Brief description of drawings]

FIG. 1 shows an embodiment of a motor drive camera according to the present invention. FIG. 1 is a schematic configuration diagram for explaining a positional relationship of each part in a camera body, and FIG. 2 is a schematic front view of a shutter mechanism. Fig. 3 is a schematic plan view of an upper unit having a reduction gear train, Fig. 4 is a schematic side view of a side unit, Fig. 5 is a cross-sectional view of an essential part of the upper unit, and Fig. 6 is a schematic view of a lower unit. FIG. 9 is a bottom view, FIG. 7 and FIG. 8 are cross-sectional views of a main part of the film rewinding operation button portion in the upper unit and a schematic perspective view showing the locking structure thereof, FIG.
(B) is a time chart at the time of photographing and rewinding. 1 ... Motor drive camera, 1a ... Camera body, 2
...... Take-up spool, 5 …… Mirror box, 7 …… Shutter mechanism, 10 …… Motor, 10a …… Output shaft, 11 …… Reduction gear train, 12 …… Upper unit, 13 …… Rotation transmission shaft, 14
...... Lower unit, 15 …… Side unit, 16 …… One-way clutch, 17 …… Film winding mechanism, 18 …… Shutter charge mechanism, 19 …… Mirror up mechanism, 25 …… Charge cam, 27,28… … Set lever, 29,30,31 …… Link lever, 32 …… Shutter charge pin, 35 …… Set lever, 37 …… Switch lever, 38 …… Timing switch, 42 …… Ratchet gear, 43 …… Ratchet arm ,
44 …… Mirror lever, 47 …… Slide lever, 49,50…
… Mirror up lever, 51 …… Spring.

Claims (1)

[Claims] 1. A mirror-up slide lever supported slidably in a horizontal direction below a side of a mirror box, and rotatably supported above the slide lever with a habit of turning in one direction. First with the tip connected to the slide lever side
Mirror up lever, and a lower end of which is rotatably supported coaxially with the first lever, and a lower end of which is extended to be engageable with an engaging portion provided on the side opposite to the biasing direction of the first lever and has an upper end. A second mirror up lever that is provided so as to be engaged with a mirror connecting pin projecting to the side of the mirror box and is biased in a direction opposite to that of the first lever; and the side of the mirror box. A first link lever that is rotatably supported on the upper side and is given a habit of turning in one direction, and is connected to the lower end side of the first link lever and extends downward without interfering with the second mirror up lever. A second link lever, a rotatable third link lever having one end connected to the lower end thereof and a shutter charge pin provided at the other end, and the third link lever locked and held in the shutter charged state. With the slide lever Is equipped with a set lever that is engaged and released from the locked state at the end of movement when the mirror is raised, and moves the slide lever so that the second mirror up lever rotates in the mirror up direction when the motor rotates forward. The motor drive camera is characterized in that the first link lever is rotated in the shutter charge direction when the motor is rotated in the reverse direction.