JPH0335650B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an automatic focusing device (hereinafter simply referred to as an AF device) that automatically focuses a photographic lens, and an aperture shutter that also functions as an aperture shutter. The present invention relates to an autofocus camera comprising a shutter device that controls exposure by starting the shutter after setting.

[Background of conventional technology and its problems]

The well-known AF conventionally used in this type of camera
All devices are configured to be able to perform multi-step focus adjustment, requiring a large number of light-receiving elements and high-precision arithmetic circuits, making the configuration complex.Moreover, this type of camera requires only a release operation. In order to minimize the time it takes for the shutter to start and complete the exposure so that you do not miss a shot, the distance between the camera and the subject is detected and the AF electromagnet is controlled to bring the photographic lens into focus. The operation of the AF device to set the subject and the aperture setting operation of the shutter device, which detects the brightness of the subject and controls the aperture setting electromagnet to set the aperture opening amount of the aperture shutter, are performed in parallel. After that, an electromagnet for starting the shutter is activated to control exposure. For this reason, since the operating timing of the AF device and the shutter start time of the shutter device are completely different, it is possible to use the same electromagnet as the AF electromagnet and the shutter start electromagnet. However, since the aperture setting operation timing overlaps with the AF device operation timing, the aperture setting electromagnet and the AF electromagnet cannot be used for both purposes, so they have to be installed separately. This has disadvantages, such as requiring space for installation, increasing the size of the device, and requiring a power source with a large power capacity to operate the circuits of the electromagnets at the same time.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and focus adjustment is performed at two points: a near-distance area and a far-distance area.
By using the AF device, even though the AF operation timing and aperture setting operation timing overlap, the same electromagnet can be used as both the AF electromagnet and the aperture setting electromagnet, which was previously impossible, and the structure is simple. The objective is to provide a low-cost, compact autofocus camera.

[Summary of the invention]

In order to achieve the above object, the present invention selectively moves the photographing lens to a short-distance position or a long-distance position to focus, depending on the presence or absence of a distance measurement signal from a distance measurement circuit that detects the distance between the camera and the subject. Exposure control is performed by controlling the amount of movement of the aperture setting member that regulates the aperture opening amount of the shutter that also serves as an aperture depending on the timing of output of a light amount signal from the light amount detection circuit that detects the brightness of the subject. In an autofocus camera, the camera includes an actuating member that causes the photographing lens and the aperture setting member to follow the release operation and travels at a constant speed, and activates the shutter at the final stage of the travel; a switch means for activating the light amount detection circuit when the member reaches a predetermined position; and a switch means that is excited by the distance measurement signal of the distance measurement circuit and the start of operation of the light amount detection circuit, and is energized by the distance measurement signal of the distance measurement circuit and the start of operation of the light amount detection circuit; An electromagnet that is demagnetized by a signal, a control member that is attracted by the excitation of this electromagnet and released by demagnetization, and that locks the aperture setting member when the electromagnet is released, and a control member that hooks both ends of a spring to the control member so that the actuating member While reaching a predetermined position, the photographic lens is driven by the biasing force of the spring given by the displacement of the control member attracted by the electromagnet excited by the distance measurement signal of the distance measurement circuit when it is attracted, and the photographing lens is moved to a short distance position. Alternatively, it is equipped with a locking member that stops at a long-distance position, and when the subject is within a short-distance area, the electromagnet is excited by the distance measurement signal, and after the photographic lens is set at the short-distance position, the electromagnet is activated by the light intensity signal. Demagnetize and set the aperture, and if the subject is in a far distance area, excite the electromagnet at a time when the photographic lens can pass through a short distance position and move the photographic lens to a long distance position. The aperture can be set by demagnetizing the electromagnet using a signal.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings.

First, the configuration of an autofocus camera according to the present invention will be explained based on FIG. 1 showing the main parts as seen from the film side in the shutter-completed state, and FIG. 2 showing the main parts as seen from the front of the photographing lens.

In Fig. 1, A is the shutter board, which includes an exposure aperture _A1 centered on the optical axis, a photometric aperture _A2 of the photometric element M, mounting holes _A3 to _A6 , and elongated holes _A7 to A. ₉
and A ₁₉ and bent portions A ₁₀ to A ₁₂ are respectively formed, and the axes A ₁₃ to A ₁₉ are crimped, or if the substrate is made of synthetic resin, they are implanted using an insert or the like.

B is the release lever, which is attached to the shaft of the shutter board A.
A bent part B3 is formed with elongated holes _B1 and _{B2 that} fit into _A15 and _A18 , and a spring is stretched between the bent part _B3 and the bent part _A12 of the shutter board A. It is attached to the shutter board A so that it can be pressed down against _B8 , and the bent part
Formation of B ₄ , convex portion B ₅ and concave portion B ₆ , and photographic lens N
A pin B ₇ is implanted to protrude to the back side through a long hole A ₁₉ in the shutter board A, which is provided to prevent the release from being pressed by closing an opening/closing lid (not shown) that covers the camera when the camera is not in use. Further, a contact piece _B9 shown in FIG. 2, which constitutes the main switch _SW0 in the control circuit of FIG. 10, is attached to the back side of the shutter board A through the elongated hole _A9 .

C is the shutter operating member, which is attached to the shaft of the shutter board A.
Elongated holes C ₁ and C ₂ that fit into A ₁₄ and A ₁₅ , respectively;
A bent portion _C3 is formed, and a spring _C4 stretched between the bent portion _C3 and the bent portion _A11 of the shutter board A constantly applies a biasing force in the right direction, and the protrusion The parts _C5 to _C7 , the step part _C8 , and the back side of the shutter board A are formed with a bent part _C9 which is bent into a U-shape with an extended arm.

D is the aperture setting member, which is attached to the shaft _A14 of the shutter board A.
The elongated holes D ₁ and _{D 2 ,} the protrusion D ₃ , the locking teeth D ₄ of multiple teeth, and the bent portion D 5 are formed, and the tooth position of the locking teeth D ₄ is formed to fit into the holes D 1 and A ₁₅ , respectively. and an aperture regulating member _D9 having an aperture cam measuring surface _D6 , a rotation stopper _D7 , and a bent portion _D8 , which are formed in advance to correspond to the aperture cam surface D6.
is attached by the pin D ₁₀ and the screw D ₁₁ , while the protrusion C ₇ of the shutter operating member C resists the spring D ₁₃ stretched between the bent portion D ₈ and the axis A ₁₅ of the shutter board A. It is slidably mounted on the shutter board A so that it can be moved leftward. The diaphragm setting member D is made of synthetic resin and electrically suspends a metallic diaphragm regulating member ^D9 , thereby forming a synchro switch mechanism with the shutter opening/closing member described below.

E is a speed regulating mechanism, which is interposed between the upper plate E ₁ and the lower plate E ₂ , has a fan shape, and has a pin E ₅ planted in the arm E ₄ , and is constantly provided with a counterclockwise rotational habit by a spring E ₆ . Ankle through fan gear E ₃ and intermediate gears E ₇ and E ₈
E ₉ is involved, contacts the protrusion C ₅ of the shutter operating member C, and when the shutter operating member C is returned by the spring C ₄ , the return is operated at a substantially constant speed.

F is a shutter locking member, which is an arm that is pressed by the bent part _B4 of the release lever B when releasing the shutter.
The shutter board A has F ₁ and resists the biasing force of spring F ₃ .
is rotated counterclockwise _around axis A ₁₇ of They each form an arm _F2 .

G is an electromagnet used for both autofocus and exposure, consisting of a core _G1 , a coil frame _G2 , and this coil frame _G2.
It consists of a coil _{G3 which is wound around the coil G3 and} which excites the core _G1 with a current supplied by _the light quantity detection circuit ME of the control circuit shown in FIG. There is.

H is a control member that is given the habit of rotating clockwise around the axis _A17 of the shutter board A by a constant spring _H1 that attracts and separates from the electromagnet G, and meshes with the locking teeth _D4 of the aperture setting member D. The locking pawl _H2 and the protruding step
It has an armature plate _H5 which forms a protrusion H3 pressed by _{D3 and} a protrusion pin _H4 protruding to the back side through the elongated hole _A7 of the shutter board A, and is attracted to the core _G1 of the electromagnet G.

I is the shutter starting member, which is attached to the shaft of the shutter board A.
A ₁₃ is rotatably supported, and is always given a clockwise rotational habit by a spring I ₁ , and when the shutter is charged, the end C ₁₀ of the shutter operating member C is used to rotate the arm I _{2 .}
The roller I ₃ provided at the tip of is pressed and rotated counterclockwise against the spring I ₁ , and the step I ₄ is engaged by the locking pawl J ₁ of the locking member J described below to its rotational position. At the same time, an elongated hole _I5 is formed, a bent part _I7 is inserted into this elongated hole _I5 , and the bent part I7 is rotatably supported on an axis _I8 , and is constantly rotated counterclockwise by a spring _I9 . It supports a striking member I ₆ which is given a habit and forms a striking claw I ₁₀ .

J forms a locking pawl _J1 and an arm _J2 that lock the shutter actuating member I in the rotating position, and an arm _J4 that is pressed by the bending portion _C9 of the shutter actuating member C. This is a locking member which is rotatably supported on a shaft _A16 and can be rotated clockwise against a spring _J3 which always gives a counterclockwise rotational habit to release the engagement with the shutter actuating member I.

K is a shutter opening/closing member, which has a shaft _K2 implanted at the tip of one arm _K1 extending in a V-shape, and this shaft _K2 is struck by the striking member _I6 of the shutter starting member I to strike the shutter board A. It is rotatable counterclockwise about the shaft _A16 against the spring _J3 of the locking member J, and has a pin _K4 that protrudes in both directions and is implanted at the tip of the other arm _K3 . Long hole A on board A ₈
The shaft _K4 protruding through opens and closes the diaphragm shutter L shown below.

L is a shutter that also serves as an aperture, and has two shutter blades.
Consisting of L ₁ and L ₂ , forming constricted parts L ₁ ′ and L ₂ ′,
These diaphragm portions L ₁ ′ and L ₂ ′ control the diaphragm opening set by the amount of displacement of the pin K ₄ of the shutter opening/closing member K that comes into contact with the diaphragm cam side face D ₆ of the diaphragm control member D ₉ in the diaphragm setting member D. Form and expose.

M is a light receiving element, which is configured in the light amount detection circuit ME of the control circuit shown in Fig. 10, and detects the brightness of the subject and controls the timing of cutting off the current supplied to the coil _G3 of the electromagnet G according to the brightness of the subject. The control member H is separated in response to the light quantity signal, and the locking claw _H2 of the control member H locks an appropriate locking tooth _D4 of the aperture setting member D to set the amount of movement of the aperture setting member D. This is to control the aperture opening amount of the shutter C which also serves as a diaphragm.

Continuing on to FIG. 2, N is a photographing lens.

O is a lens holding ring, which is rotatably engaged with a fixed ring having a helicoid (not shown) cut therein.

P is a lens drive member that holds the photographic lens N and moves it to the focusing position when adjusting the focus. It forms a donut-shaped ring around the optical axis, and forms the distance measurement tooth P ₁ and the switch switching arm P ₂ . With,
A pin P 3 is installed at the base of the switch switching arm P ₂ , and a spring _{P 4 stretched} between this pin P ₃ and the shaft A ₁₉ of the shutter board A allows the switch to rotate counterclockwise at all times. The switch switching arm _P2 is pressed by the U-shaped bent portion _C9 of the shutter operating member C, and the spring _P4
is rotated clockwise against the

Q is the mounting plate, and attach the lens retaining ring O to the screw Q ₁
This is attached to the lens driving member P by _Q3 to drive it integrally.

R is a light shielding member, which is rotatably fitted to the above-mentioned fixed ring (not shown), and is held by a spring _R2 tensioned between the bending part _R1 and the pin _T1 on the lens holder T shown below. An arm _R3 which is always given a clockwise rotational habit and is in contact with the U-shaped bent portion _C9 of the shutter operating member C to follow the movement of the shutter operating member C; Therefore, it has a shielding part _R4 which covers the opening of the light receiving element M in a shutter-charged state, which can be retracted at a constant speed. Note that the hole _R5 in the shielding portion _R4 is provided to allow a certain amount of light to be applied to the light receiving element M in the shutter charging state to improve responsiveness.

S is a lens locking member that can lock the photographic lens N at the in-focus position, for example, a close-range position or a long-distance position set with two-point focus, in this case a short-distance position, and arms S ₁ and S ₃ A spring _S5 is formed in a U-shape and is rotatably supported on the shaft _A19 of the shutter board A, and has _a winding portion supported on the shaft _A19 of the shutter board A. S ₅ ″ arm S ₁
The bent portion S ₂ of the control member H is sandwiched in between and is provided on the protruding pin H ₄ of the control member H, and is configured to receive the biasing force of the spring given by the displacement of the protruding pin H ₄ . When the member H is attracted by the electromagnet G, it is rotated counterclockwise, and the bent claw S ₄ at the tip of the other arm S ₃ engages with the distance measuring tooth P ₁ of the lens driving member P, and it is moved to a short distance position. stop the photographing lens N, and
The engagement holds the photographing lens N in that position.

T is a lens holder that holds the photographic lens N movably back and forth, and also holds the aperture frame T ₂ of the light receiving element M.
is formed and the pin _T1 is implanted, and the distance measuring tooth _P1 of the lens driving member P and the locking claw _S4 of the locking member S can almost be engaged by the switch switching arm _P2 of the lens driving member P. When the final position is reached, the light amount detection circuit ME of the control circuit shown in Fig. 10 is turned off so that it is activated, and the photographic lens N is placed at a short distance position.
When stopping the photographing lens N, continue to excite the electromagnet G to stop the photographing lens N at a short distance position, and when extending the photographing lens N to a long distance position, excite it at this position and detect the amount of light without stopping the photographing lens N. Switch for synchronizing the operation of circuit ME
It has SW ₂ ′.

Moreover, FIG. 10 shows an embodiment of a control circuit for operating the above-mentioned autofocus camera. However, the switch provided on the lens holder T in the above-mentioned embodiment is
In place of SW ₂ ', a contact piece D ₁₃ is provided on the shutter operating member C to enable direct control of each circuit. Broadly speaking, this circuit can be divided into an autofocus distance measurement circuit AF that detects the distance between the camera and the subject and automatically moves the photographing lens to the focusing position, and an AF circuit that detects the brightness of the subject and functions as an aperture depending on the brightness. The light intensity detection circuit AE sets the aperture opening of the shutter and performs exposure control, and the sensitivity setting circuit DX detects the specific ISO sensitivity of the film loaded in the camera (in this case, ISO sensitivity 400) and automatically sets the film sensitivity.
and a low-luminance warning circuit LW that detects the brightness of the subject and issues a warning in the case of darkness outside the interlocking range, and an electromagnet G that is controlled by the light amount detection circuit ME in accordance with the distance measurement signal of the distance measurement circuit. It consists of a signal output circuit OC.

The distance measurement circuit AF has an infrared light emitting element LED ₁ that emits infrared light toward the subject for a certain period of time when the main switch SW ₀ is turned on by pressing the release lever B, and a pair of infrared light emitting elements that capture the reflected light from the subject. Light-receiving elements SPD ₁ and SPD ₂ , amplification circuits IC 1 and IC 2 that amplify the outputs of the pair of light-receiving elements SPD ₁ and SPD ₂ , respectively, and amplification circuits IC ₁ and IC _{2 ,} respectively.
A differential circuit IC ₃ captures the output difference of IC ₂ , and the output of the differential circuit IC ₃ is compared with a reference level, and transistor Tr ₁ is turned on when the subject is within a short distance range.
It consists of a comparison circuit IC ₄ that outputs a distance measurement signal and a latch circuit AFR that latches the distance measurement signal.
When the subject is within a short distance range and the photographing lens N is extended to a short distance position to perform focusing, the latch circuit AFR outputs a distance measurement signal in synchronization with the start of the return operation of the shutter operating member C, and the transistor
Turn off Tr ₁₃ , turn on transistor Tr ₈ of the light amount detection circuit ME, and turn on the coil of electromagnet G.
A current is supplied to G ₃ to excite it and attract the control member H, and the rotation of the lens driving member P is stopped by the lens locking member S, and the photographing lens N is
Stop and hold at a short distance position. In addition, if the subject is within a long distance range and the shooting lens is extended to a long distance position, the transistor of the distance measurement circuit AF
Tr ₁ becomes OFF, and the latch circuit AFR turns transistor Tr ₁₃ of the signal output circuit OC into ON state, which turns transistor Tr ₈ of the light amount detection circuit ME into an ON state.
By controlling the OFF state and maintaining the demagnetized state of the electromagnet G without supplying current to the coil _G3 of the electromagnet G, the taking lens N can be moved without blocking the rotation of the lens drive member P by the lens locking member S. It is adapted to be extended to a distant position following the shutter operating member C.

The sensitivity setting circuit DX consists of a sensitivity detection pin (not shown) provided in the film cartridge chamber of the camera and a sensitivity electrode body provided in a position facing the sensitivity detection pin of the cartridge _.
ISO of film loaded depending on ON/OFF status
The light intensity detection circuit automatically detects the sensitivity and, for example, when ISO400 film is loaded, transistor Tr ₂ is turned OFF, transistor Tr ₃ is turned ON, and variable resistor VR ₁ is set to an appropriate value in advance.
Connect to the ME reference bias circuit to set the reference level.
While setting the film sensitivity by automatically changing the level according to ISO sensitivity 400, the transistor
Turn on Tr ₄ at ISO sensitivity 400 and signal output circuit OC
The state of the transistor Tr ₁₄ can be controlled according to the return operation position of the shutter actuating member C, and the electromagnet G is controlled so that the diaphragm opening amount of the diaphragm shutter L can be adjusted according to the film sensitivity. Furthermore, the transistor Tr ₅ is controlled so that the warning conditions of the low-luminance warning circuit LW can also be adjusted.

The low brightness warning circuit LW is a shielding part of the light shielding member R.
The photoreceptor _M1 of the photoreceptor M captures the brightness of the subject by controlling _the amount _of incident light by _R4 . ) and a sensitivity setting circuit.
A second reference bias circuit whose level can be adjusted by DX, a comparator IC ₅ which compares the output levels of both circuits and outputs an L level when the brightness is low.
A light emitting element that uses this output to warn of low brightness conditions.
Consists of ₂ LEDs.

The light amount detection circuit ME is connected to the shielding portion _R4 of the light shielding member R.
a second photoresponsive bias circuit having a photoreceptor _M2 of the photoreceptor M that controls the amount of incident light and captures the brightness of the subject, and a third reference that can automatically adjust the film sensitivity level by a sensitivity setting circuit DX. Compare the bias circuit and the output level of both circuits and
When the voltage level of the photoresponsive bias circuit reaches the threshold voltage, transistor Tr ₇ is turned off.
A comparator circuit IC ₆ inverts the transistor Tr ₈ to the ON state and the transistor Tr _{8 to the OFF state, and when the transistor Tr 8} is in the OFF state, the current supply is cut off and demagnetized, the control member H is separated, and the aperture setting member D is moved to an appropriate position. It is comprised of a coil _G3 of an electromagnet G that can be stopped at 100 degrees and can set and control the aperture opening amount of the aperture shutter L in accordance with the brightness of the subject.

The signal output circuit OC controls the transistor Tr ₁₃ according to the ranging signal output from the latch circuit AFR which latches the ranging signal from the ranging circuit AF, and
The activation timing of the light amount detection circuit ME is caught by the switch SW ₂ or SW ₂ ' and its state is latched. According to the output of the latch circuit MER, current is supplied to the coil G ₃ of the electromagnet G of the light amount detection circuit ME to determine the excitation timing of the electromagnet G. It controls the Furthermore, as in this circuit, a contact piece D ₁₃ is provided on the aperture setting member D, and after turning on the FM switch SW ₅ , the switches SW ₂ , SW ₃ , and SW ₄ are sequentially switched using this contact piece D ₁₃ . By switching the ON/OFF state of the transistor Tr ₁₄ , it is possible to set the optimum FM conditions, especially considering the sensitivity of the loaded film and the distance to the subject.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 to 9.

First, in FIG. 1, seen from the film side, which shows the main parts of the autofocus camera according to this embodiment in its initial state, and FIG. By displacing it to the left against _C4 , the shutter actuating member I is rotated counterclockwise against spring _I1 , and the step part
The locking pawl _J1 of the locking member J, which is freed by the displacement of the U-shaped bent portion _C9 of the shutter starting member I and rotates by the biasing force of the spring _J3 , engages with the shutter _I4 . Hold the activation member I in that position. At this time, the striking claw I ₁₀ of the striking member I ₆ in the shutter starting member I comes into contact with the shutter opening/closing member, but the striking member I ₆ is connected to the spring I ₉
The shutter opening/closing member K is maintained in that state in order to rotate clockwise against this and escape. On the other hand, the projection _C7 of the shutter operating member C causes the aperture member D to move leftward against the spring _D3 , and the shutter operating member C
The lens driving member P is moved clockwise against the spring _P4 by the U-shaped bent portion _C9 , and the fan gear _E3 of the speed regulating mechanism E is moved by the shutter operating member C by the spring _E6 .
are rotated counterclockwise to follow the protruding portion _C5 of the shutter actuating member C, and the stepped portion _C8 of the shutter actuating member C is locked by the arm _F2 of the shutter locking member F, thereby moving to the respective positions. is maintained.
At this time, the control member H is rotated counterclockwise by the projection _D3 of the diaphragm setting member D against the spring _H1 , and the armature plate _H5 is held in a position close to the electromagnet G, and the lens The switch SW ₂ ' is turned on by the switch switching arm P ₂ of the drive member P. Further, while the arm _R3 follows the displacement of the U-shaped bent portion _C9 of the shutter operating member C, the light shielding member R is also rotated clockwise by the biasing force of the spring _R2 , and the opening frame T of the lens holder T is rotated. ₂ , the automatic focusing mechanism and shutter mechanism are in the charged state as shown in FIGS. 3 and 4.

Therefore, in connection with the release of the camera, the release lever B is pressed down against the spring _B8 , and the main switch _SW0 of the control circuit shown in FIG. 10 is activated by the contact piece _B9 .
The control circuit becomes ON and the autofocus circuit operates.
The AF light emitting element LED ₁ emits light toward the subject, and the reflected light from the subject is sent to two light receiving elements.
The distance measurement signal is received by SPD ₁ and SPD ₂ , the difference in output is captured, and if the subject is within the close range (this range is set in advance by design), the distance measurement signal is immediately output from the autofocus latch circuit AFR. The collector voltage of the transistor Tr ₇ of the light amount detection circuit ME is set to H level, the transistor Tr ₈ is turned ON, and a current is supplied to the coil G ₃ of the electromagnet G to excite the electromagnet G, attract the control member H, and close the lens locking member S. The bending claw _S4 is held in a position where it meshes with the distance measuring tooth _P1 of the lens driving member P, and the subject is in a long distance range (this range is also set in advance by design, and range), the distance measurement signal is not output from the autofocus latch circuit AFR and the electromagnet G
In order to maintain the demagnetized state, the control member H also maintains the state in which the protrusion H _{3 is in contact with the protrusion D 3 of} the aperture setting member D. On the other hand, the bent part B ₄ of the release lever B
presses the arm _F1 of the shutter locking member F against the spring _F3 , and the shutter starting member F is rotated counterclockwise, causing the stepped portion _C8 of the shutter operating member C and the arm _F2 to be rotated counterclockwise.
The shutter operating member C is released from the spring
Due to the biasing force of _C4 , the return operation is started in the right direction and at a substantially constant speed by the speed regulating mechanism E that comes into contact with the protrusion _C5 . Following this return movement of the shutter operating member C, the diaphragm setting member D, which abuts the bent portion _D5 against the protrusion _C7 of the shutter operating member C, is moved rightward by the spring _D13 , and the shutter operating member C The lens driving member P that contacts the switch switching arm _P2 with the bent portion _C9 bent into a U-shape is the spring _P4.
When the subject is within a short distance range, the bending claw _S4 of the arm _S3 of the lens locking member S engages the distance measuring tooth _P1 of the lens driving member P, as described above. The distance measuring tooth _P1 and the bending claw _S4 engage with each other to stop the counterclockwise rotation of the lens driving member P and set the photographing lens N at a short distance position. On the other hand, the arm R ₃ is bent by the U-shaped bent portion C ₉ of the shutter operating member C.
The light shielding member R, which is pressed, is rotated counterclockwise against the spring _P2 , and the shielding portion _R4 is retracted, allowing the reflected light from the subject to enter the light receiving element M.
Switch switching arm P ₂ of lens driving member P
As a result, the switch SW ₂ ' is turned OFF, and if the subject is within a short distance range, the electromagnet G is continuously excited by the operation of the light amount detection circuit ME in the control circuit shown in Fig. 10, and the operation shown in Figs. 5 and 6 is performed. The operating state shown is as shown below. On the other hand, if the subject is within a long distance range, the electromagnet G is energized at this point and the control member H is
5, and in this case, the bent claw _S4 of the lens locking member S shown in FIG. 6 and the distance measuring tooth _P1 of the lens driving member P do not mesh with each other, and the lens driving member P Continue to rotate the photographing lens N in the counterclockwise direction.
to a long distance position.

When the diaphragm setting member D, which follows the subsequent return movement of the shutter operating member C, reaches a predetermined value according to the brightness of the subject, the light amount is detected in the control circuit of FIG. The output of comparator IC ₆ of circuit ME is inverted and the transistor
Tr ₇ is turned ON and transistor Tr ₈ is turned OFF to cut off the current supply to the coil G ₃ of the electromagnet G, demagnetize the electromagnet G, and separate the control member H by the biasing force of the spring H ₁ . H locking claw
The locking teeth _D4 are engaged and stopped by _H2 , resulting in the operating state shown in FIG. On the other hand, as shown in Fig. 8, when the subject is within a short distance range, the bent claw _S4 of the lens locking member S and the distance measuring tooth _P1 of the lens driving member P are in mesh with each other at a short distance position. The control member H separates from the electromagnet G and rotates clockwise, and its protruding pin
H ₄ is displaced upward and the spring S ₅ of the lens locking member S
The arm S ₅ ' of is lifted upward to apply an urging force to rotate the lens locking member H clockwise, but the meshing state is maintained due to the meshing. Therefore, when the subject is within a long distance range, the bending claw _S4 of the lens locking member S and the distance measuring tooth _P1 of the lens driving member P are not engaged, so that the lens locking member S cannot be controlled. Part H
It moves clockwise due to the biasing force of the spring _S4 given by the displacement of the protruding pin _H4 .

Then, as shown in the operating state shown in FIG. 9, the bent portion _C9 , which is bent into a U-shape at the final backward movement position of the shutter operating member C, comes into contact with the arm _J4 of the locking member J, and the locking member J is held in place by a spring. By rotating the _shutter actuating member _I in the clockwise direction against the spring I1 and disengaging the stepped portion _I4 of the shutter actuating member I by the locking pawl _J1 of the locking member J, the shutter actuating member I It is rapidly rotated clockwise by the force. As a result of this rotation, the striking pawl _I10 of the striking member _I6 in the shutter starting member I strikes the shaft _K2 of the shutter opening/closing member K, causing the shutter opening/closing member K to rotate counterclockwise against the spring _J3 .
The pin _K4 implanted in _K3 opens the aperture shutter L until the pin _K3 collides with the aperture cam side face _D6 of the aperture regulating member _D9 in the aperture setting member D which is stopped. After reaching the operating state shown in the figure, due to the biasing force of spring _J3 and bounce at the time of collision, it rapidly rotates clockwise and closes to perform exposure and complete a series of camera operations. In preparation for the next photograph, the shutter actuating member C, which is in the operating state shown in FIG. 9, is charged again to the left against the spring _C4 , thereby returning to the operating state shown in FIGS. 3 and 4.

〔Effect of the invention〕

As described in detail above, the autofocus camera of the present invention combines an AF device that performs focus adjustment at two points, a near-field area and a long-distance area, and a shutter device to adjust the AF operation timing and aperture setting operation timing. Even though they overlap, the same electromagnet can be used as both the AF electromagnet and the aperture setting electromagnet, making it possible to provide a compact autofocus camera with an extremely simple structure and low cost. .

[Brief explanation of drawings]

FIGS. 1 to 9 are explanatory diagrams of operating states of essential parts of an autofocus camera according to the present invention, and FIG. 10 shows an embodiment of the control circuit thereof. In the figure, A...Shutter board, B...Release lever, C...Shutter operating member, D...Aperture setting member, E...Governing mechanism, F...Shutter locking member, G...Electromagnet, H ...Control member, I...Shutter starting member, J...Lock member, K...Shutter opening/closing member, L...Shutter that also serves as a diaphragm, M...Light receiving element, N...Photographing lens, O...Lens holding ring , P... Lens drive member, Q... Mounting plate,
R... Light shielding member, S... Lens locking member, T...
Lens cradle, AF... Distance measurement circuit, DX... Sensitivity setting circuit, LW... Low brightness warning circuit, ME... Light level detection circuit, OC... Signal output circuit.

Claims (1)

[Scope of Claims] 1. A distance measurement circuit that outputs a distance measurement signal when the distance between the camera and the subject is within a predetermined distance range, and a focus adjustment member that extends the photographing lens depending on the presence or absence of the distance measurement signal from the distance measurement circuit. The first distance position error is caused by an automatic focusing device that selectively moves the lens to a second distance position to focus the photographing lens, and an automatic focusing device that is activated at least after the focus adjustment member passes through the first distance position during the release operation. and a light amount detection circuit that outputs a light amount signal at a timing corresponding to the brightness of the subject, and controls exposure by controlling the amount of movement of an aperture setting member that regulates the aperture amount according to the light amount signal of the light amount detection circuit. In an automatic focusing camera, the focus adjustment member and the aperture setting member are moved by a release operation, and are excited by the output of a distance measurement signal of the distance measurement circuit or the operation of the light amount detection circuit. an electromagnet that is demagnetized by a light amount signal output from the light amount detection circuit; a control member that is displaced by demagnetization of the electromagnet and locks the aperture setting member; and a control member that is displaced by excitation of the electromagnet. and a lens locking member that locks the focus adjustment member at the first distance position with a displacement of , and when a distance measurement signal is output from the distance measurement circuit,
The electromagnet is excited by the distance measurement signal to lock the focus adjustment member of the photographing lens at the first distance position, and then the electromagnet is demagnetized by the light amount signal to lock the aperture setting member; When the distance measurement signal is not output from the distance circuit, the light amount detection circuit is activated to excite the electromagnet after the focus adjustment member passes the first distance position, and the electromagnet is demagnetized by the light amount signal. An autofocus camera that locks an aperture setting member.