JPH01205133A - Camera - Google Patents

Abstract

PURPOSE:To obtain the photographed image of high quality by providing a lens holding means which allows an internal screw cylinder to pass at such an interval that the internal screw cylinder does not contact. CONSTITUTION:One arm of a blade driving lever 20 which is one member of a shutter blade driving mechanism is made to press-contact with the front end surface of the internal screw cylinder 1c with spring force and the internal screw cylinder 1c is pressed into an annular part 1b with said spring force. When the internal screw cylinder 1c advances by slipping out of the annular part 1b, the internal screw cylinder 1c inclines to an external screw shaft 2 since there is play in a screwing part of the external screw shaft 2 with the internal screw cylinder 1c in a diameter direction. The hole diameter of the ring-shaped part 1b, however, has such a size that a helicoid ring does not interfere with the ring-shaped part 1b even if the inclination of the internal screw cylinder 1c occurs, so that the action of the internal screw cylinder 1c does not influence a lens barrel 1. Therefore, the lens barrel 1 is not vibrated in exposure by receiving the effect of the play between the external screw shaft 2 and the internal screw cylinder 1c. Thus, the photographed image of high quality can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camera, and particularly to a camera that changes the photographing magnification,
This relates to a lens barrel drive mechanism for performing focus adjustment.

[Prior art]

Previously, in Japanese Patent Application No. 61-282300, the present applicant provided a female threaded tube that fits into a lens barrel that is supported movably in the direction of the optical axis while restricting its rotation, and provided a screw tube that is screwed into the female threaded tube. A camera has been proposed in which the threaded shaft is rotated by the driving force of a motor to cause the threaded barrel to protrude from the fitting part with the lens barrel, and to open the shutter blade at its tip.

As shown in a conceptual diagram in FIG. 6, the above-mentioned camera is movable in the axial direction of the annular portion 202a of the lens barrel 202, which is positioned by support bars 203 and 204 so as to be movable back and forth on the camera body 201. Female thread tube 2 with proper fitting
05 is inserted. When the male threaded shaft 207 that is screwed into the female threaded tube 205 rotates by receiving rotational force from the motor 206, the female threaded tube 205 is pressed by the force of the spring against the blade drive lever 9 that is pivotally supported by the lens barrel 202. For this purpose, lens barrel 20
2 moves forward in the optical axis direction together with the female threaded cylinder 205. Then, when the stop member 208 engages with the locking teeth 202b of the lens barrel 202 and the forward movement of the lens barrel 202 is stopped, the female threaded barrel 205
is pulled out from the lens barrel annular portion 202a, and a blade drive lever 209, which is a member of the shutter blade drive mechanism, is rotated against the spring bias to open the shutter blade via a plurality of parts.

At this time, the annular portion 202a of the lens barrel 202 and the female threaded barrel 205
The fitting play between the outer diameter of the male threaded shaft 207 and the female threaded cylinder 205 is
Because it is smaller than the fitting play of the threaded part of
Before 05 is removed from the lens barrel annular portion 202a, it is the female threaded barrel 2.
05 is regulated by the lens barrel annular portion 202a, but as the female threaded barrel 205 moves out from the lens barrel annular portion 202a, the length of the female threaded barrel 205 fitted into the lens barrel annular portion 202a decreases. (The tilt occurs when the blade drive lever 20
This is because 9 is pushing the female thread cylinder 205 with spring force)
. As a result, the fit play between the threaded portion of the male threaded shaft 207 and the female threaded barrel 205 becomes smaller, and the slight movement during rotation of the male threaded shaft 207 is directly transmitted to the lens barrel 202.
Furthermore, the lens barrel 202 is tilted due to the inclination of the female threaded tube 205. By the way, when the female threaded barrel 205 is protruding from the lens barrel annular portion 202a, the blade drive lever 20 is moved as described above.
During film exposure, the shutter blade is opened via the lens 9, and if the lens barrel holding the photographic lens moves slightly or tilts at this time, the photographed image will be blurred, which is a serious problem.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and includes a motor, a male threaded shaft that rotates by the driving force of the motor, and a shaft that is threadedly engaged with the male threaded shaft and rotated by the rotation of the male threaded shaft. an actuating member that operates a shutter blade in conjunction with the movement of the female threaded cylinder; and a lens holding means that allows the female threaded cylinder to pass through the lens at an interval such that the female threaded cylinder does not come into contact with each other,
It is an object of the present invention to provide a camera which prevents the lens holding means from vibrating during exposure due to the play between the male threaded shaft and the female threaded cylinder, and which can obtain high quality photographed images.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. The illustrated camera, which is an embodiment of the present invention, is configured so that lens barrel movement for zooming and lens barrel movement for automatic focusing are performed by a common lens barrel movement and positioning device. In addition, it is configured such that only one motor supplies power to the lens barrel moving and positioning device, the film feeding device, and the shutter drive device, and furthermore, it controls the operation of all the devices. It is configured so that control is performed using only one electromagnetic magnet. Further, the camera is configured such that after long-focus photography is completed, the lens barrel is automatically returned to the most retracted position by the lens barrel moving and positioning device, and then locked by the locking means.

FIG. 2 is a schematic diagram showing an example of the lens barrel moving/positioning device installed in the camera of this embodiment, and FIG. 3 is a schematic diagram showing the main parts of the lens barrel moving/positioning device, etc. of the camera of this embodiment. FIG.

In FIG. 2, reference numeral 1 denotes a lens barrel as a lens holding means, which is an object to be moved and positioned, and the lens barrel l has serrated locking teeth 1a that engage with a stop member to be described later. It is provided integrally with the lens barrel 1. Reference numeral 2 denotes a male threaded shaft that is screwed into a female threaded barrel (not shown) inside the lens barrel 1 and moves the lens barrel 1 forward in the direction of arrow f1.A gear 3 is fixed to the male threaded shaft 2. ing. Rotation is transmitted to the gear 3 from a differential device 4 which serves as an operation start timing control means to be described later, and rotation is transmitted to the differential device 4 from a motor 9 via a shaft 5, a reduction gear 6° 7, and a power transmission switching mechanism 8. is transmitted. The male threaded shaft 2, the gear 3, and the helicoid portion within the lens barrel 1 constitute object moving means for moving the lens barrel 1 (that is, the object).

A stop member moving and positioning means 11 is connected to the differential gear 4 via a reaction means lO. The stop member moving and positioning means 11 is a device that feeds a stop member 12 (described later) by a predetermined distance parallel to the object movement direction and positions it at a predetermined position, and has a structure, for example, which will be explained later in a specific embodiment in FIG. This is the device.

Reference numeral 12 denotes a stop member that engages with the locking teeth 1a of the lens barrel 1 to stop the movement of the lens barrel l in the direction of the arrow f1, and the stop member 12 is connected to the axis 12a in the direction perpendicular to the plane of the paper.
Mounting part 1 swings in the direction of arrow f2 with
It is supported by 3. The mounting part 13 is a mechanical connection means 14
or directly attached to the stop member moving and positioning means 11.

The stop member moving and positioning means 11 is a minute movement device for moving and positioning the stop member 12 by a predetermined minute distance in three directions indicated by arrows, and the means 11 serves as a restraint release means and a differential start timing control means. After being actuated by the differential device 4 via the response means 10, the actuation is stopped by the operation control means 15 (described later) via the transmission means.

Reference numeral 15 denotes an operation control means for controlling the timing of engaging the stop member 12 with the locking tooth 1a and the timing of stopping the movement of the stop member moving and positioning means 11 in the arrow f3 direction. It is connected to the stop member 12 and the stop member moving and positioning means 11 via means 16 and 17, respectively. In a specific embodiment described later, the actuation control means 15 is an electromagnetic actuator,
In other words, it is composed of an electromagnetic magnet.

Reference numeral 18 denotes a control circuit that calculates the amount of movement to be given to the lens barrel l, and controls the operation control means 15 based on the calculation result, as well as controls starting, stopping, reversing, etc. of the motor 9. from motor 9 to screw shaft 2
An output signal from an interlocking amount detection means 19 for detecting the amount of momentum given to the stop member moving and positioning means 11 is inputted. In the device of this embodiment, the amount of movement of the lens barrel 1 is determined by the operation start timing of the differential device 4 and the operation timing of the stop member 12 as the operation start timing control means. It is not determined by the timing of startup and shutdown.

The control circuit 18 divides the moving distance to be given to the lens barrel l into a first moving distance and a second moving distance based on the basic concept of the present invention, and generates a first signal representing the first moving distance. a second signal representing a second moving distance;
5 to control the stop member moving and positioning means 11 and the stop member 12, thereby moving the lens barrel l by a predetermined distance.

The operation start timing of the stop member moving and positioning means 11 and the male threaded shaft 2 (ie, the object moving means) is determined by the differential device 4 as an operation start timing control means.

That is, when power is transmitted from the motor 9 to the shaft 5, the differential device 4 first operates the stop member moving and positioning means 11 via the response means IO, and moves the stop member 12 in the direction of the arrow through the means 11. After making a slight movement in the direction of f3 (that is, parallel to the moving direction of the lens barrel 1), after a predetermined period of time, the male threaded shaft 2 is rotated to move the lens barrel l in the direction of the arrow f.
Move in one direction.

Object moving means constituted by the male threaded shaft 2, that is,
The minimum movement unit of the lens barrel moving means (that is, the pitch of the locking teeth 1a) is the stop member moving and positioning means 11.
Therefore, the lens barrel is moved by the screw shaft 2 over a much larger distance than the movement distance of the stop member 12. The distance that the stop member 12 moves is determined by the stop member moving and positioning means 11.
The start of operation of the means 11 is determined by the differential gear 4, and the operating path of the means 11 is determined by the operation control means 15. Therefore, the moving distance of the stop member 12 and the moving distance of the lens barrel 1 are determined by the timing of the operation of the operation control means 15.

FIG. 3 is an exploded perspective view showing an embodiment of the camera of the present invention. In addition, in FIG. 3, parts that correspond to the conceptual configuration shown in FIG. 2 are indicated by the same reference numerals as in FIG. 2.

In FIG. 3, 1 is a lens barrel, and the lens barrel 1
Support bars 50 and 51 are inserted into holes 1j and lk provided in the flange portion IA of the camera body, respectively, so that the lens barrel 1 is positioned so as to be movable back and forth with respect to the camera body (not shown). Further, 1a is the locking tooth fixed to the flange portion IA of the lens barrel 1. The flange portion IA has an annular portion 1b.
is formed, and a female threaded cylinder 1e that is threadedly engaged with the screw shaft 2 is inserted into the annular portion lb with play in the radial direction. An axial groove (not shown) parallel to the axial direction is formed on the inner circumferential surface of the annular portion 1b, and an axial protrusion 1d protruding from the outer circumferential surface of the female threaded cylinder 1e slides into the axial groove. It is movably fitted. The female threaded cylinder 1c has a thread carved on its inner peripheral surface to be screwed into the female threaded shaft 2, and a flange portion 1e having a larger diameter than the inner diameter of the annular portion 1b is formed at the front end. . Since the flange portion 1e is formed at the front end of the female threaded barrel 1c as described above, the female threaded barrel 1c is inserted into the annular portion lb from the front. After the lens barrel 1 is stopped by the stop member 12 during the drawing-out process, only the female threaded barrel 1c is pulled out from within the annular portion lb and moves forward on the male threaded shaft 2.

One arm 20a of a blade drive lever 20, which is a part of the shutter blade drive mechanism, is attached to a spring 2 on the front end surface of the female threaded cylinder 1c.
1, and the force of this spring 21 forces the female threaded cylinder 1c into the annular portion ib. Therefore, while the lens barrel l is moving forward, the female threaded barrel 1c will not be pulled out from inside the annular portion lb, but after the lens barrel l is stopped by the stop member 12, the female threaded barrel 1c will be removed from the male threaded shaft 2. Since the axial thrust given to exceeds the force of the spring 21, the female threaded tube 1c is pulled out from the annular portion 1b and moves forward.

At this time, since there is play in the radial direction at the threaded joint between the male threaded shaft 2 and the female threaded cylinder 1c, the female threaded cylinder 1c is tilted with respect to the male threaded shaft 2 (as shown in the enlarged view in Fig. 1). As shown in the annular part 1b
The hole diameter is set so that the helicoid ring lc will not interfere with the annular portion 1b even if the female threaded tube 1c is tilted, and the behavior of the female threaded tube lc will not affect the lens barrel l. It has become.

The blade drive lever 20 is rotatably supported by a support pin If provided on the lens barrel 1, and biased counterclockwise by a spring 21 fitted to the support pin If.

The support pin 1 is also attached to the flange portion IA of the lens barrel l.
A pin 1g parallel to the screw shaft 2 is protruded near f, and a blade opening lever 38 in the shutter blade drive mechanism shown in FIG. 4 is rotatably supported on the pin Ig. Note that the shutter blade drive mechanism will be explained later.

A gear 3 is fixed to the screw shaft 2, and rotation is transmitted to the gear 3 from a differential device 4 serving as operation start timing control means.

As shown in FIG. 3, the differential device 4 includes a driven member 22 having an external gear portion that meshes with the gear 3, and a driven member 22 that transmits rotation to the driven member 22 with a predetermined time delay. 22, a drive member 23 actuates the stop member moving and positioning means 11, and a spring 2 urges the drive member 23 toward the driven member 22.
4.

The driven member 22 is a gear portion 22 that is constantly engaged with the gear 3.
a and a spiral end cam portion 22b, and the end cam portion 22b is formed with a spiral cam surface 22c and a stopper portion 22d. - The blade drive member 23 has a protrusion 23a that comes into contact with the cam surface, an engagement section 23b that engages with the gear 6, and a flat surface 23c that engages with the follower 25c that corresponds to the above-mentioned response means IO. (plane perpendicular to the axis)
It rotates together with the gear 6 and can move away from the gear 6 in the axial direction.

That is, an axial groove is formed in the peripheral wall surface of the shaft hole of the gear 6, into which the engaging portion 23b is fitted so as to be movable in the axial direction.
The gear 6 and the driving member 23 are connected by inserting the engaging portion 23b into the axial groove. Engagement part 2
The axial length of 3b is designed to be longer than the axial distance of the drive member 23, and therefore, even when the drive member 23 moves to the farthest position from the gear 6, the engaging portion 23b remains attached to the shaft of the gear 6. It won't come out of the hole. The gear 6 is a gear driven by a motor 9 (FIG. 2) via a power transmission switching mechanism 8 and a gear 7. Although the shaft supporting the driven member 22 and the driving member 23 is not shown in FIG. 3, the shaft supporting the driven member 22 and the shaft supporting the driving member 23 are separate bodies, and The member 22 is fixed to the driven member support shaft.

19 is the momentum detecting means shown in FIG.
a and a photo ink printer 19b that generates pulses in accordance with the black and white pattern on the encoding plate 19a.

Next, with reference to FIG. 3, components corresponding to the stop member moving and positioning means 11 associated with the drive member 23 of the differential device 4 and components corresponding to the response means 10 of FIG. 2 will be described. explain.

In FIG. 3, a toothed sector arm 25 is disposed near the drive member 23 and supported so as to be rotatable about an axis 25a perpendicular to the screw shaft 2. A pin 25b parallel to the shaft 25a is provided on the toothed sector arm 25 at a position apart from the shaft 25a. abutted on top. The toothed sector arm 25 also has a follower 25c projecting parallel to the pin 25b, and the follower 25c abuts against the flat surface 23c of the drive member 23, as described above.

The stop member supporting/moving member 26 is supported by a structural member such as the camera body by three supporting/sliding guide pins 26b to 26d parallel to the screw shaft 2, and is movable in a direction parallel to the pins. ing. The pins 26b to 26d
The spring 27 fitted into one of the members 26d
is compressed between the outer surface of the camera body and the surface of a structural member such as the camera body, and the spring 27 causes the member 26 to move in the direction of arrow f4 in the figure (that is, in the direction parallel to the male threaded shaft 2 and toward the front of the camera). Always energized.

Therefore, the pin 25b of the toothed sector arm 25 is also
In the figure, the follower 25c is urged upward, and the follower 25c is also pressed against the flat surface 23c of the drive member 23 by the force of the spring 27. Further, the toothed sector arm 25 is also biased counterclockwise in FIG. Since movement is blocked, the toothed sector arm 25 remains stationary unless the drive member 23 moves axially.

A stop member support pin 26e for rotatably supporting the stop member 12 is protruded from the stop member supporting and moving member 26, and the pin 26e is inserted into the hole 12 at the base end of the stop member 12.
b so as to be relatively rotatable. A spring 28 is fitted into the pin 26e and urges the stop member 12 clockwise in FIG. 3.

A claw member 29 for indexing (positioning) the toothed sector arm 25 to an arbitrary rotational angle position is arranged close to the outer periphery of the sector arm 25. The claw member 2
9 is an axis 29a parallel to the axis 25a of the sector arm 25;
It is supported by a stationary structural member so as to be rotatable about the axis, and is biased in the direction of the arrow by a spring 30. A locking pawl that engages with the teeth of the sector arm 25 is formed at the tip of the pawl member 29, and when the locking pawl enters between the teeth of the sector arm 25, the sector arm 25 pivots. Even if the sector arm 25 is able to rotate counterclockwise about the sector arm 25a, the claw member 29 prevents the sector arm 25 from rotating.

An arm 29b is provided protruding from the shaft 29a, and the arm 29b is pushed by a pin 31 of a second lever 31 (described later) by the force of a spring 30.
It is pressed against a. The second lever 31 is connected to the claw member 29
This is a member that overcomes the force of the spring 30 and operates counterclockwise (that is, in the direction of engaging the pawl member 29 with the teeth of the toothed sector arm 25).

As is clear from the above description, the stop member moving and positioning means 11 for moving the stop member 12 in a direction parallel to the screw shaft 2 and positioning the stop member 12 at an arbitrary position is a toothed sector arm. 25, a pin 25b integral therewith, a stop member supporting and moving member 26 for the follower 25c1, a spring 27, a claw member 29 for indexing the toothed sector arm 25 to an arbitrary rotation angle position, and other members. ing. In addition, the mounting part 1 shown in FIG.
3 and the mechanical connection means 14 are originally not necessary, but may be necessary if the stop member moving and positioning means 11 has an electrical configuration.

In the embodiment shown in FIG. 2, the response means 10 for interlocking the stop member moving/positioning means 11 and the differential gear 4 is a follower 25c integrated with a toothed sector arm 25.

Next, a magnet (that is, an electromagnetic actuator) as the operation control means 15 shown in FIG. 2, the operation control means 15, the stop member 12, and the stop member moving and positioning means 1
1 will be explained.

In FIG. 3, 32 is a magnet as the operation control means 15 in FIG.
) has a plunger 32a that is moved in the direction of arrow f5. When the magnet 32 is in a non-excited state (OFF), the plunger 32a is moved in the direction of an arrow f5 in the figure by a lever spring described later.

The transmission means 16 and I7 are composed of a first lever 33 that is moved by the magnet 32, and a second lever 31 and a third lever 34 that are moved by the second lever 33.

The lever 33 is supported by a structural member of the camera so as to be rotatable about a shaft 33a, and has first to fourth four levers.
It has several arms. Among these arm parts, the first arm part 33b has a pin 33. at its tip that engages with the plunger 32a. c is fixed, and a pin 33e that engages with the first pin 31b fixed to the second lever 31 is fixed to the tip of the second arm 33d.

Further, the third arm portion 33f engages with one arm portion 34a of the third lever 34, and the fourth arm portion 33g is connected to a pin 40b fixed to a blade release mold 40 which is a part of the shutter drive mechanism.
is engaged with. The fourth lever 33 is always biased clockwise around the shaft 33a by a spring 35 that is engaged with the fourth arm 33g. Therefore, when the magnet 32 is not excited, the plunger 3
2a is not moved in the direction of arrow f5 in the figure, the lever 33 is rotated clockwise about the shaft 33a by the force of the spring 35.

The second lever 31, which together with the second lever 33 constitutes the transmission means 16, has a shaft 31c orthogonal to the male threaded shaft 2, and is supported by a structural member so as to be rotatable about the shaft 31c. ing. The second lever 31 has two arm parts 31d and 31c extending outward from the shaft 31c, and a pin 3 fixed to the tips of these arm parts 31d and 31e.
Among 1a and 31b, one pin 31a is connected to the claw member 29.
The other pin 31b engages with the arm portion 29b of the lever 3.
It is engaged with the pin 33e of the second arm portion 3d of No. 3.

On the other hand, the third lever 34, which constitutes the transmission means 15 together with the third lever 33, has a boss portion 34c having a shaft hole 34b whose axis is parallel to the screw shaft 2.
By inserting a pin (not shown) of the structural member into the holder, it is rotatably supported by the structural member about the pin. The third lever 34 has two arms 34a as shown in the figure.
and 34d, one arm 34a is engaged with the third arm 33f of the third lever 33, and the other arm 34d has a pin 34e at the tip that engages with the arm 12c of the stop member 12. Fixed.

The above is the schematic configuration of the mechanical structure of the lens moving and positioning device in the camera of this embodiment.

Next, the structure of the shutter drive mechanism installed in the camera of the present invention will be explained with reference to FIG.

In FIG. 4, the IC is an internally threaded cylinder shown in FIG.
is a vane-driven lever. The blade drive lever 20 has two arms 20a and 20b, one arm 20a engages with the front end surface of the female threaded cylinder 1c, and the other arm 20b engages with one arm 38a of the blade opening lever 38. ing.

The blade opening lever 38 is a pin 1g fixed to the lens barrel 1.
It has a boss portion 38c having a shaft hole 38b into which is fitted, and is urged counterclockwise by a spring 39 around the shaft hole 38b. The other arm 3 of the blade opening lever 38
A pin 38e to be inserted into the boss hole 40a of the blade release mold 40 (see FIG. 3) is fixed to the tip of the blade release mold 8d, and a spring 41 fitted to the pin 38e causes the blade release mold 40 to be inserted into the boss hole 40a.
A clockwise force is applied to the pin 38e. As shown in FIG.
0b, and when the lever 33 is actuated by the force of the spring 35, it is rotated about the pin 40b in the direction of arrow f7 in FIG. 3, that is, counterclockwise.

A blade drive shaft 42 having an arm 42 a that engages the blade release mold 40 is provided adjacent to the blade release mold 40 . The blade drive shaft 42 has a shaft portion 42b parallel to the male threaded shaft 2, is rotatably supported by the lens barrel 1 at the shaft portion 42d, and is rotated by a spring 43 applied to an arm 42c. is biased clockwise around . Another arm 42d is formed at the other end of the shaft portion 42b, and a pin 42e that is inserted into a slot 44a formed through the shutter blade 44 projects from the tip of the arm 42d. ing. A pivot pin (not shown) is attached to the shutter blade 44.
A rotation center hole 44b is formed into which the shutter blade 44 is inserted, and the shutter blade 44 is rotated about the rotation center hole 44b.

Next, the control circuit, detector, etc. installed in the camera of this embodiment will be explained with reference to FIG. In addition, the fifth
The circuit shown in the figure includes all the circuits and detectors related to the control of the magnet 32 of FIG. 2, and the control circuit 18 shown in FIG. 2 includes only a portion of the circuit shown in FIG. Contains only

In FIG. 5, 101 is a switch that is closed when a release button (not shown) is pressed to the first stroke, 102 is a switch that is closed only when long-focus photography is performed, and 10.3 is a switch that is closed when the release button (not shown) is pressed to the second stroke. This is a switch that closes when pressed. 10
5-107 are pull-up resistors, 109-111 and 12
8, 129 and 123 are inverters, 113 to 115
is a latch circuit composed of R-S flip-flops, etc.
116 is a known distance measuring circuit, 117 and 122 are AD conversion circuits, 125 to 127 are digital comparators, 13
0 and 104 are AND gates, 121 is a known photometric circuit, 138 is an OR gate, 19 is the momentum detector shown in FIGS. 1 and 3, 139 is a transistor for turning on and off the excitation current to the magnet 32, 118 is a decoder.

The decoder 118 calculates the required lens movement amount from the binarized distance value in the AD conversion circuit 117, and divides the required lens movement amount into the upper two digits and the lower two digits.
At the same time, the AD conversion circuit 122 calculates the required movement amount of the blade aperture from the binarized photometric signal to generate an output signal for obtaining proper exposure. 1
A counter 19 counts pulse signals generated from the momentum detector 19. Further, 140 is the decoder 11
Digital comparator 1 based on the first output signal of 8
Address register 141 for storing the reference value at 25;
142 is a block register that stores the reference value in the digital comparator 126 based on the second output signal of the decoder 118, and 142 is an exposure register that stores the reference value in the digital comparator 127 based on the third output signal of the decoder 118. . Address register 146 is the upper two digits of the required lens movement amount (i.e. large movement amount)
In addition, the block register 141 is used to set the lower two digits (ie, minute movement amount) of the required lens movement amount. 143 is the latch circuit 11
This is a motor control circuit that controls the drive of the motor 9 in response to the output of the motor 5 and the output of the digital comparator 127.

Next, the operation of each part in the camera of this embodiment will be explained with reference to FIGS. 3 to 5.

Note that before starting photography (that is, when not photographing), the lens barrel 1 is held in the most retracted position by the converter lens holding frame 36, and the helicoid ring lc is attached to the lens barrel l. The flange portion 1c is inserted into the annular portion 1 with only the flange portion 1c protruding from the annular portion lb.

Further, the protrusion 23a of the drive member 23 of the differential device 4 is brought into contact with the highest position a of the cam surface 22c of the driven member 22, and the drive member 23 is stopped 7, and the toothed sector arm 2
The follower 25c of No. 5 is driven by the drive member 23 by the force of the spring 27.
It is pressed onto the flat surface 23c of.

At this time, the toothed sector arm 25 is stopped at its original position by the upward reaction force from the drive member 23, and the claw member 29 and the second lever 31 are moved by the spring 35 because the plunger 32'a is in the OFF state. The claw member 29 is held in a left-rotated state and the second lever 31 is held in a clockwise-rotated state by the force. In this case, since the driving member 23 is stopped at the highest position in FIG. 2, the follower 25c of the toothed sector arm 25 is also stationary at the highest position, and therefore the pin 25b is at the lowest position of the driving member. It is in a state where it is pushed down by 23. Therefore, the stop member supporting/moving member 26 is also stopped in the state of being pushed down to the lowest position (that is, the origin position M) by the pin 25b in FIG. 3, and the spring 27 is in the most compressed state. It's working. The stop member 12 is therefore also stationary in its home position. Further, at this time, the pin 34e of the third lever 34 that engages with the arm 12c of the stop member 12 is not given the force from the third lever 33 that urges the arm 12c rightward in FIG. The stop member 12 is held in a position away from the locking tooth 1a by the force of the spring 28.

On the other hand, since the magnet 32, which is the operation control means, is in a non-excited state, no force is applied to the plunger 32a in the direction of arrow f5 in FIG. It is in a state of being biased in the direction of the arrow.

On the other hand, in the shutter drive mechanism, since the female threaded barrel 1c does not protrude significantly forward from within the annular portion lb of the lens barrel 1, the arm 20a of the blade drive lever 20 is lowered to its lowest point in FIG. 3 by the force of the spring 21. Therefore, the other arm 20b of the lever 20 is held in its highest position in FIG. For this reason, the blade opening lever 3
The arm 38d of 8 and the blade release mold 40 integrated therewith are the spring 3
It stands still at the position where it is rotated the most in the direction of the arrow with a force of 9. Further, the blade drive shaft 42 engaged with the blade release die 40 is in a state of being rotated by the force of the spring 43 in the direction of the arrow, and the shutter blade 44 holds the shutter in a closed state. At this time, of course, the motor 9 (second
Figure) has stopped.

The operation of each part when shifting from the above-mentioned state to long focus photography will be described below.

Prior to the photographing operation, when the long focus photographing mode is selected by operating a photographing mode switching knob (not shown) for long focus photographing, the switch 102 shown in FIG. 5 is turned on.

Next, in order to start photographing, the operator focuses on the subject and presses the release button (not shown) to the first stroke, thereby turning on the switch 101 shown in FIG. For this reason,
An output is generated in inverter 109, and in response, an output is generated in latch circuit 113.

When an output is generated from the latch circuit 113, the distance measurement circuit 116 and the photometry circuit 121 are activated to perform distance measurement and photometry using a known method, and the distance measurement and photometry results are sent to the AD conversion circuits 117 and 122, respectively. It is binarized with .

The binarized distance measurement value is applied to the decoder 118 and converted into a required lens movement amount corresponding to the distance measurement result and a blade drive amount corresponding to the photometry result, and the required lens movement amount is converted in a predetermined manner. The first output signal representing the small movement amount is sent to the address register 140.
A second output signal representing the large amount of movement is input to the chome register 141.

At this time, as described above, since the switch 102 is closed, an output is generated in the inverter 110, and since an output is also generated in the latch circuit 114, the decoder 118
An input signal is also input to the decoder 118, and the decoder 118 performs calculations for long focus photography. Therefore, the decoder ttS outputs to the block register 141 a signal representing the long distance movement required for long-focus photography.

On the other hand, the address register 140 receives a signal representing the minute distance movement required for minute lens movement out of the necessary lens movement regardless of long focus photography or short focus photography, and this signal is input to the register 140. It is stored as a reference value for the minute movement distance.

Next, press the release button down to the second stroke.
Since the output is generated from the latch circuit 115, the AND gate 1
03 conducts, the digital converter 125 does not generate an output, so the inverter 128 generates an output). Therefore, the OR gate 138 generates an output, and as a result, the transistor 139 conducts and the magnet 32 Excited.

When the magnet 32 is energized, the plunger 32a is attracted in the force direction indicated by the arrow f in FIG. As a result, the pin 31a of the second lever 31 is lowered and the claw member 29 is rotated by the force of the spring 30 in a direction away from the teeth of the toothed sector arm 25, making the sector arm 25 rotatable. On the other hand, the arm portion 33f of the third lever 33 pushes the arm 34a of the third lever 34 toward the front in FIG. 12, and as a result, the stop member 12 is rotated counterclockwise in FIG. It engages with the teeth 1a to temporarily restrain the lens barrel l.

Thereafter, the motor control circuit 143 drives the motor 9 in the forward rotation direction by the output from the latch circuit 115, and rotates the gear 6 clockwise in FIG. 3 via the power transmission switching mechanism 8.

When the gear 6 rotates clockwise, the driving member 23 rotates clockwise and the protrusion 23a of the member 23 contacts the driven member 22.
The driven member 23 slides down from the position a to the position b on the cam surface 22e of the drive member 23 while rotating.
It moves in the axial direction towards 2.

At this time, as described above, the load on the driven member 22 and the restraining force of the converter lens holding frame 36 on the lens barrel l are acting, so the driven member 22 is rotationally driven during the axial movement of the driving member 23. It never gets put away.

When the driving member 23 begins to move in the axial direction toward the driven member 22, the force that was pushing the follower 25c upward in FIG. 3 (that is, the force that was pushing the spring 27 downward) is removed.
As is gradually decreased, the spring 27 begins to expand, causing the stop support and displacement member 26 to move upwardly in FIG. 3 (toward the front of the camera).

When the member 26 starts moving in the direction of arrow f4, the member 26
The pin 25b which is pressed onto the projection 26a of the pin 25b is also lifted upwards, so that the toothed sector arm 25 begins to pivot counterclockwise in FIG. 2 about its own axis 25a.

In this case, the rotation angle of the stop member supporting/moving member 26 during movement in the arrow f4 direction and the rotation angle of the toothed sector arm 25 are detected as the rotation angle of the gear 6 by the momentum detection means 19 as an electrical pulse signal. Therefore, a pulse signal corresponding to the amount of movement of the member 26 is applied from the momentum detecting means 19 in FIG. 5 to the input signal terminal of the digital comparator 125. Therefore, when the value of the pulse signal becomes equal to the reference value, the output of the digital comparator 125 is generated and the output of the comparator 125 is applied to the inverter 128. Therefore, the output of the inverter 128 disappears, and the AND gate 136 becomes non-conductive.
Therefore, the output of the OR gate 138 also disappears and the transistor 139 is turned off, so that the magnet 32 is demagnetized.

Therefore, the plunger 32a is pulled out in the direction of the arrow FS by the force of the spring 35, and the second lever 33 is moved toward the shaft 33a.
It is rotated clockwise around the center. Therefore, since the second lever 31 is rotated clockwise about the shaft 31c, the arm 29b of the claw member 29 is attached to the pin 31 of the second lever 31.
a, and as a result, the claw member 29 is pushed up by the shaft 2.
It rotates counterclockwise about 9a, and the claw at its tip engages with the teeth of the toothed sector arm 25, thereby stopping the rotation of the sector arm 25. Therefore, since the upward movement (movement in the direction of arrow f4) of the pin 25b of the sector arm 25 is also stopped, the arrow f of the stop member supporting/moving member 26 is stopped.
The movement in direction 4 is also stopped, and the stop member 12 is positioned at a position moved from the original position by a distance corresponding to the rotation angle of the toothed sector arm 25 in the direction of arrow f4.

On the other hand, in response to the fact that the first lever 33 is rotated clockwise due to the demagnetization of the magnet 32, the arm 33 of the second lever 33 is rotated clockwise.
Since f also rotates clockwise, the third lever 34 is moved by the spring 2.
The stop member 12 is rotated counterclockwise around the shaft hole 34b by the force of the spring 28, and the stop member 12 is also rotated counterclockwise around the shaft hole 34b by the force of the spring 28.
It is rotated clockwise around 2b. Therefore, the claw at the tip of the stop member 12 is disengaged from the locking teeth 1a, and preparations are made to move the lens barrel l forward.

After the above-described operations, when the protrusion 23a of the driving member 23 reaches the point on the cam surface 22c of the driven member 22, the axial movement of the driving member 23 is blocked and the driven member 22
2 begins to rotate clockwise together with the drive member 23, and as a result, the male threaded shaft 2 begins to rotate via the gear 3.
The lens barrel l is moved forward. When a forward thrust is applied to the lens barrel 1 by the screw shaft 2, the protrusion 11
(See FIG. 4) moves forward over the maximum protrusion of the engaging portion 36e of the converter lens holding frame 36, and as a result, is released from the restraint on the lens barrel 1.

In the process of moving the lens barrel 1 forward to the position required for long-focus photography, the converter lens holding frame 36 also springs 3.
It is rotated around the support shaft 36a by a force of 7, and is finally positioned in the lens barrel 1 at a position immediately behind the main lens.

During the process in which the lens barrel 1 moves forward on the male threaded shaft 2, the amount of rotation given to the male threaded shaft 2 is detected by the momentum detection means 1.
9 output pulses, which are applied to the input terminal of the digital comparator 126. Then, when the number of input pulses to the digital comparator 126 becomes equal to the reference pulse number stored in advance in the lower register 141, an output is generated in the digital comparator 126, and as a result, the AND gate 138 becomes conductive and the transistor 139 is turned on. , the magnet 32 is excited.

When the magnet 32 is excited, the plunger 32a is pulled in the direction of arrow f5, so the second lever 33 is moved by the spring 35.
This rotation of the third lever 33 causes the third lever 34 to rotate clockwise about the shaft hole 34b.

Therefore, the pin 34e pushes the arm 12c of the stop member 12,
The stop member 12 is rotated counterclockwise about the shaft hole 12b, and the claw at the tip of the stop member 12 jumps between the locking teeth 1a to stop the forward movement of the lens barrel l.

At this time, the pressure of the first lever 33 on the claw member 29 is released, but since the claw member 29 is bitten by the teeth of the sector arm 25, the spring 30 prevents the claw member 29 from rotating clockwise.

Note that, in the camera of this embodiment, the completion of the forward movement of the lens barrel 1 means the completion of the photographing magnification enlargement operation and the focusing operation.

Even after the forward movement of the lens barrel l has stopped, the motor 9 continues to rotate, and the male threaded shaft 2 also continues to rotate, so a forward thrust is applied from the threaded shaft 2 to the female threaded barrel 1c, and as a result, the female threaded barrel 1c Overcoming the force of the spring 21, it is pulled out from inside the annular portion lb and moves forward on the screw shaft 2.

On the other hand, when the female threaded tube 1c protrudes forward from the annular portion 1b, the blade drive lever 20 is rotated clockwise in FIGS. 3 and 4 about the pin if by the female threaded tube 1c. The blade opening lever 38, which is rotatably fitted, is shown in FIG.
It is rotated clockwise around the shaft hole 38b). Further, as the blade opening lever 38 rotates, the blade drive shaft 42 is rotated counterclockwise about the shaft 42b via the blade release mold 40, so that the shutter blade 44 is rotated via the pin 42c of the blade drive shaft 42 in a counterclockwise direction. is rotated about the rotation center 44b.

The amount of rotation of the shutter blade 440 is detected as an output pulse of the momentum detection means 19, and the output pulse is applied to the input terminal of the digital comparator 127. When the number of input pulses to the digital comparator 127 becomes equal to the reference pulse number stored in advance in the exposure register 142, an output is generated in the comparator 127, and as a result, the transistor 139 is turned off and the magnet 32 is demagnetized. .

When the magnet 32 is demagnetized, the second lever 33 is connected to the spring 3.
5, the tip of the arm 33g pushes the pin 40b of the blade release mold 40 to the right in the figure, and the blade release mold 40 is rotated counterclockwise. As the blade release mold 40 is rotated counterclockwise, the engagement with the shaft portion 4.2b of the blade drive shaft 42 is released (see FIG. 4).
, the blade drive shaft 42 is rotated clockwise by the force of the spring 43 and closes the blade via the pin 42e.

Thereafter, the motor control circuit 143 reverses the motor 9 based on the output of the digital comparator 127, and first, the female threaded barrel 1c retreats into the annular portion lb of the lens barrel l, and then the lens barrel 1 is returned to the most retracted position shown in FIG. In this case, the protrusion 23a of the drive member 23 of the differential device 4 initially
Since the driving member 23 is located at the upper point, when the driving member 23 is rotated counterclockwise, the driven member 22 does not rotate for the first rotation, and the driving member 23 moves in the axial direction while rotating. The follower 25c of the toothed safety arm 25 is pushed up to its original position, and the sector arm 25 is also pushed up to the shaft 25a.
It is rotated clockwise around the center and returned to the initial position. Further, the stop member supporting/moving member 26 is also returned to the initial position by the pin 25b. After the members constituting the stop member moving and positioning means 11 are returned to their initial states, the driving member 23 and the driven member 22 are combined and reversed, and the lens barrel 1 is moved backward to return to its initial state. After being returned to the position and winding up one frame of film by a known method, the motor is stopped.

In the embodiment shown above, the stop member moving and positioning means 11, the response means 10, and the transmission means 16 and 1
7 are all constituted by mechanical mechanisms, but it is not necessary that these means be constituted only by mechanical mechanisms, and it is natural that these means may be replaced with, for example, non-mechanical devices.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide a camera that can obtain high-quality photographed images, and its effectiveness is extremely high.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main parts of a camera showing an embodiment of the present invention, FIG. 2 is a conceptual diagram of a lens barrel moving and positioning device equipped in the camera of the present invention, and FIG. FIG. 4 is an exploded perspective view of a main part of a camera equipped with a device that embodies the conceptual configuration of the camera shown in FIG. Fig. 6 is a conceptual diagram of a conventional camera, 1...lens barrel, 2...male thread shaft, 3...gear,
4...differential device, 6 and 7...gear,
8... Power transmission switching mechanism, 9... Motor,
DESCRIPTION OF SYMBOLS 10... Response means, 11... Stop member moving and positioning means, 12... Stop member, 16 and 17... Transmission means, 15... Operation control means,
18... Control circuit, 19... Momentum detection means, 20
...Blade drive lever, 22...Driving member (of differential device 4), 23...Driving member (of differential device 4), 25.
... Toothed sector arm, 25b... Pin, 25c... Follower, 2
6... Stop member supporting and moving member, 29... Claw member, 31... Second lever,
32... Electromagnetic magnet, 33... Rubber, 34
...Third lever, 36...Converter lens holding frame, 36a...Engaging portion, 38...Blade opening lever, 40...Blade release type, 42...Blade drive shaft, 44... ...Shutter blade.

Claims (1)

[Claims] A motor, a male threaded shaft that rotates by the driving force of the motor, a female threaded cylinder that is threadedly engaged with the male threaded shaft and moves in the axial direction of the male threaded shaft by rotation of the male threaded shaft, and An operating member that operates a shutter blade in conjunction with movement, and an interval that holds the operating member and prevents the female threaded cylinder from coming into contact with the male threaded shaft due to play between the female threaded cylinder and the male threaded shaft. and a lens holding means for allowing the lens to pass through the female threaded tube.