JPH0331942Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera whose photographic lens system is movable to at least three positions.

Conventionally, this type of camera was developed in 1986.
There is something that was disclosed in Publication No. 35624. The collapsible camera disclosed in the publication includes a guide member that converts the motion in the optical axis direction when collapsing the photographing lens system to the collapsible position into a rotational motion, and the distance ring for focus adjustment is rotated by the action of this guide member. The position of the photographic lens system is set to the normal focal position (a position that focuses from infinity to close distance, which is unique to each photographic lens system), and when shooting again, the photographic lens system This reduces the need for focusing operations.

However, the collapsing operation of this camera relies on manual force, and in addition to the original collapsing operation, the setting to the normal focus position is also performed at the same time, so the required force is large, and in that sense, There was a problem with operability.

In addition, with this conventional collapsible camera, photographs are often taken with the photographic lens system set at the normal focus position, and if the collapsing operation is performed by mistake during photography, the photographic lens system will retract into the collapsible position. The drawback was that the shooting ended in failure.

An object of the present invention is to provide a camera that has excellent operability and is free from the risk of the above-mentioned photographing failure.

To this end, the camera of the present invention moves the photographic lens system electrically, and with a single manual operation, the photographic lens system can be retracted to the retracted position, and the photographic lens system can be moved from the retracted position to the desired position. This adjustment is made such that the retraction can be performed only when the lens is in the preparatory position where the lens is extended a fixed amount, and the retraction cannot be performed when the lens is displaced from the preparatory position and is in an operating position that focuses on a subject at a distance closer than infinity. This is what was done.

Therefore, the operation is extremely simple, and since the lens system does not move to the retracted position during photographing, failures in photographing as described above are prevented.

The structure of the present invention will be explained below with reference to the reference numerals of the embodiments to be described later.

(1) The feeding position closest to the film side (third
(Fig. 4), a preparation position (Fig. 4) that is extended a predetermined distance toward the subject from the retracted position, and an operation to shift from the preparation position by adjusting the focus and focus on a subject within a range closer than infinity. Position (5th
Photographic lens systems L ₁ , L ₂ (Fig.) movable to (2) feeding signal generating means 31, S ₁ that generates a feeding signal (S ₁ is ON) in response to manual operation (3) response to manual operation and focus adjustment signal (S ₃ a ~
S ₃ d is ON);
S ₃ a to S ₃ d (4) A retraction signal generating means 32, S ₂ , which generates a retraction signal (S ₂ is ON) in response to a manual operation; , the retraction position detection signal (S ₈ and S ₉ are OFF) is
position detection means S 7 which generates a preparation position detection signal (S ₇ is ON, S ₁₁ is ON) when in the preparation position and an operation position detection signal (S ₇ is OFF) when in the operation _position ; ~S ₉ , S ₁₁ ( _{6) Drive means M 1 ~ M 3 ,} 8 ~ 26 (7 ) When both the retracting position detection signal and the extending signal are detected, the driving means is actuated to advance the photographic lens system to the preparation position, and when both the preparation position detection signal and the focus adjustment signal are detected; The driving means is activated to displace the photographing lens system to the operation position, and when both the preparation position detection signal and the retracting signal are detected, the driving means is activated and the photographing lens system is moved to the retracting position. said means FF, INV ₁ , INV ₂ , Q ₁ to _{Q 8} and below, for prohibiting said driving means from operating when said operation position detection signal and said retraction signal are both detected. The invention will be explained based on examples.

FIG. 1 is a perspective view showing the structure of a retractable camera according to the present invention. In FIG. 1, a film F pulled out from a film cartridge 1 passes behind a mirror 2 and is wound around a take-up spool 3. The film winding drive system 4 uses, for example, the rotation of a winding lever as a driving source to rotate and wind the spool 3 prior to each photographing. The film rewind system 5 uses, for example, the rotation of a rewind crank as a driving source to rewind the film after photographing is completed.

A guide bar 8 is provided on a substrate 6 fixed to the camera body so as to protrude in the optical axis direction of a photographic lens (described later). A first drive barrel 8 is fitted onto the outer periphery of the guide bar 7 and is slidable in the optical axis direction. Support plate 9
is fixed to the first drive cylinder 8. 1st lens group
A support frame 10 that holds L ₁ is fixed to a rising portion 9a of a support plate 9. A second drive barrel 11 is fitted onto the outer periphery of the first drive barrel 8 and is slidable in the optical axis direction. The holding frame 12 that holds the second lens group L ₂ has a rising portion 1 that projects from the second driving barrel 11.
It is fixed at 3.

The first support 14 is provided to protrude above the substrate 6 in parallel with the guide bar 7, and has a tip 14a formed in a curved shape. The first motor _M1 has a reduction mechanism (not shown)
A pulley 15 is attached via. The string 16 is wrapped around the pulley 15 multiple times,
The end of the string 16 is connected to the support plate 9 via the rollers 17 and 18.
The other end is fixed to the support plate 9 via the roller 19 and the tip of the first support. A second support column 20 is provided on the support plate 9 to protrude in parallel with the first drive cylinder 8, and a tip 20a is formed in a curved shape. The string 21 connects the rotating shaft of the second motor _M2 and the second
It is stretched between the drive cylinder 11 and the rollers 22, 23 and the tip 20a of the second support. String 2
4 is stretched between the rotating shaft of the third motor _M3 and the second drive cylinder 11 via rollers 25 and 26. The relay member 28 is disposed at a portion of the support plate 9 facing the rising portion 13, and is connected to the first lens group _L1.
When the lens group L 2 and the second lens group L ₂ are in the closest position (focus adjustment preparation state), the movement of the support plate 9 projecting in the optical axis direction is transmitted to the rising portion 13 .

Electrode P ₁ and first pillar 14 arranged on support plate 9
The electrodes P ₂ and P ₃ arranged at 1 and 2 constitute a switch that detects whether the lens barrel is in the retracted position or in the extended position. When the electrodes P ₁ and P ₂ are in contact, it is the retracted position, and when the electrodes P ₁ and P ₃ are in contact, it is the protruding position. The electrode P ₄ disposed on the second driving barrel 11 and the electrodes P ₅ and P ₆ disposed on the second support column 20 constitute a switch that detects whether the photographic lens is adjusted to close range or infinity. When electrodes P ₄ and P ₆ are in contact, they are at close range, and when electrodes P ₄ and P ₅ are in contact, they are at infinite distance.

Here, it is assumed that the photographing lens consisting of the first lens group _L1 and the second lens group _L2 is optically designed so that the focus can be adjusted by moving the second lens group _L2 in the optical axis direction.

FIG. 2 is an external view of the retractable camera according to the present invention. A shutter release button 35, a lens ejection operation button 31, and a lens retraction operation button 32 are arranged on the upper surface of the camera body 30. Further, focus adjustment operation buttons 33 and 34 are arranged on the front surface of the camera body. The second lens group is activated by operating the operation button 33.
L ₂ is extended, and by operating the operation button 34, the second lens group L ₂ is pulled back. Shooting lens storage frame 36
is protruding from the front of the camera body.

Figure 3 is a schematic cross-sectional view showing when the taking lens barrel is in the retracted position and the taking lens is in the retracted position closest to the film side. FIG. 5 is a schematic cross-sectional view showing a state in which the lens is in a focus adjustment preparation position, and FIG.

The operation will be explained below. Although FIG. 1 shows a state in which the photographing lens barrel is in the protruding position and the photographing lens is in the operating position, when the photographic lens barrel is in the retracted position shown in FIG. 3, the situation is as follows. That is, the first motor
M ₁ has finished rotating counterclockwise and electrode P ₁
Rotation is stopped due to contact between and P ₂ . At this time, one side of the string 16 is wound around the pulley 15, and the other side is sent out from the pulley 15.
The drive cylinder 8 is pulled back on the guide bar 7 until the electrodes P ₁ and P ₂ come into contact. On the other hand, the second motor M ₂
has finished rotating counterclockwise, and the string 21 is given a predetermined amount of slack between the rotation shaft of the second motor M ₂ and the second drive cylinder 11 . Further, the third motor M ₃ has completed its clockwise rotation, and the string 24 is wound around the rotating shaft by the entire amount of movement of the second drive barrel 11 in the optical axis direction. The mirror 2 is retracted to the rear so as to be parallel to the film surface.

Now, when the projecting operation button 31 is pressed for a moment when the barrel is in the retracted position shown in Fig. 3, the first motor shown in Fig. 2 is activated.
_M1 rotates clockwise to wind the other side of the string 16 around the pulley 15 and send out the other side. Therefore, the first drive barrel 8 slides on the guide bar 7 so as to protrude in the optical axis direction (rightward in FIGS. 1 and 2). The sliding of the first drive cylinder 8 is carried out by the relay member 2.
8 to the rising portion 13, the second drive cylinder 11 also protrudes at the same time. At this time, the third
Motor _M3 rotates counterclockwise to feed out string 24. In addition, the slack of the string 21 is
It decreases according to the prominence of 1. As the above operation progresses and the electrodes P ₁ and P ₃ come into contact, the rotation of the first and third motors M ₁ and M ₃ stops. This is the protruding state of the lens barrel shown in FIG. At this time, the first and second lens groups L ₁ and L ₂ are in a focus adjustment preparation state, and the electrodes P ₄ and P ₅ are in contact with each other.

Therefore, when the operation button 33 is pressed, the second motor
M ₂ winds the string 21 and causes the second drive barrel 11 to further protrude above the first drive barrel 8 . As a result, the second lens group _L2 is extended, and the focal position approaches from infinity to close range. On the other hand, the third motor
M ₃ starts rotating further counterclockwise.
4 to avoid applying a load to the second motor _M2 . When the operator who is observing the TTL viewfinder senses that the focus position has reached the desired position and releases the pressure on the operation button 33, the motor M ₂ ,
M ₃ stops rotating. If the operation button 34 is pressed after this lens is extended, the motors M ₂ and M ₃ are rotated in reverse, and the second lens group L ₂ is pulled back.
As a result, the focal position moves back from the closest side to the infinity side. Therefore, by pressing the operation buttons 33 and 34, the focal position of the photographic lens can be arbitrarily set. The above are the focus adjustment positions of the photographic lens shown in FIGS. 1 and 5. At this time, the electrode
When P ₄ touches electrode P ₅ or P ₆ , the motor
M ₂ and M ₃ stop rotating in the direction of contact. In other words, a limit is applied.

When the lens barrel protrudes and the photographic lens is extended for focus adjustment and is in the operating position,
Even if the collapsing operation button 32 is pressed, collapsing of the photographic lens barrel is prevented. Further, when the lens barrel is protruding and the photographing lens is in the focus preparation position, pressing the collapsing operation button 32 causes the lens barrel to collapse.

FIG. 6 is a diagram of a circuit for driving the photographing lens barrel and the photographing lens group, and a circuit for controlling the driving circuit, which realizes the above operation. In FIG. 6, the protruding switch _S1 is turned ON when the protruding operation button 31 is pressed, and turned OFF when the pressing is released. The collapsible switch _S2 is turned ON when the collapsible operation button 32 is pressed, and is turned OFF when the pressure is released. 1st
~4th feed switch _S3a ~ _S3d is operation button 33
Turns on when pressed, turns off when released. 1st to 4th
The pullback switches S ₄ a to S ₄ d are turned on when the operation button 34 is pressed, and turned off when the pressure is released. The first to third safety switches _S4e to _S4g are turned off when the operation button 34 is pressed, and turned on when the pressure is released. The first collapsing detection switch _S5 consists of pins _P1 and _P2 shown in the first diagram, and the pins _P1 and _P2 come into contact when the photographic lens barrel is in the collapsible state.
When the barrel starts to protrude from the collapsed state, pins P ₁ and P ₂ separate, so it becomes OFF. Second collapsible barrel detection switch
_S5 is turned on in the opposite phase to the first barrel collapsing detection switch _S5 ,
Turn off. The first protrusion detection switch _S6 is turned OFF when the protrusion state is reached, and is ON before then. The second protrusion detection switch S ₉ connects the pins P ₁ and P ₃ shown in the first diagram.
It is turned on and off by the contact and separation of pins _P1 and _P3 in the opposite phase to the first protrusion detection switch _S6 . Switch S ₇ constitutes the collapsing control means according to the present invention,
When the lens barrel is in the protruding position and the taking lens is in the operating position, the collapsing operation switch S ₂ may be accidentally turned off.
Disable the action caused by pressing . This switch _S7 responds to the position of the photographic lens and turns ON only when it is in the focus adjustment preparation position and the lens barrel is in the protruding position. Switch S ₁₁ is a pin
It consists of P ₄ and P ₅ , and due to their contact and separation,
Turns on and off. That is, the switch _S11 is turned on when the photographic lens is in the focus adjustment preparation position, and turned off when it is in the operating position.

Now, when the barrel is retracted, switches S ₅ and S ₆ are activated.
ON, switch _S8 is OFF, so protruding operation button 3
When switch S ₁ is turned on by 1, the capacitor
The SR slip-flop is set by the output of the differentiating circuit consisting of C ₁ and resistor R ₁ , and the output Q becomes 〓H''.
, and outputs 〓L'' to the output.Inverter
Transistor Q ₁ is turned on by INV ₁ output = L''
do. In response to this, the transistors Q ₂ and Q ₃ are also turned on, so that the first motor M ₁ rapidly rotates forward (clockwise) by being supplied with power from the power source EB and causes the first drive cylinder 8 to project. At the same time, transistors Q ₄ and Q ₅ are also turned on, and the third motor M ₃ also rotates forward (counterclockwise). At this time, since the resistor R ₃ is interposed in the power supply circuit of the motor M ₃ , the rotational speed of the motor M ₃ is a slow speed that is slightly slower than that of the first motor M ₁ . This prevents the string 24 from sagging.

Therefore, even if switches S ₃ a to S ₃ d are turned ON by accidentally pressing buttons 33 and 34 when the barrel is in the retracted state, switch S ₉ remains OFF.
Motors M ₂ and M ₃ are not energized, and the focus adjustment operation of the photographic lens is blocked. In this way, accidents caused by movement of the photographic lens by motors M ₂ and M ₃ during collapsing can be prevented.

When the lens barrel reaches the protruding position, Switch S ₆
Therefore, the transistors Q ₁ to _{Q 5} are turned OFF, and the first and third motors M ₁ and M ₃ are stopped. Further, when the photographing lens is in the protruding position and the ready position, the switches S ₇ and S ₉ are turned on. Therefore, if only the operation button 33 is pressed, the switch S ₃ a
~S ₃ d is ON, and safety switches S ₄ e ~ S ₄ g are also ON. Therefore, the second motor M ₂ is connected to the switch S ₃ a,
Power is supplied through S ₄ e, S ₃ b, and S ₉ , and the string 21 is wound up by rapidly rotating forward (clockwise). Also, the third
Since the motor _M3 is supplied with power via switches _S4f , _S3c , resistor _R4 , switches _S3d , _S4g , and _S9 , it further slowly rotates forward (counterclockwise). Thus string 2
2nd lens group while preventing sagging of lenses 1 and 24.
L ₂ is rolled out. When the operation button 33 is released from this extended state, switches S ₃ a to S ₃ d are activated.
The second and third motors M ₂ and M ₃ stop rotating. Next, the switch is activated by pressing the operation button 34.
When S ₄ a to S ₄ d are turned ON and switches S ₄ e to S ₄ g are turned OFF, the third motor M ₃ is supplied with power via switches S ₄ c, S ₄ d, and S ₉ , and performs a rapid reverse rotation (clockwise rotation). The second motor M ₂ is supplied with power through the switch S ₄ a, the resistor R ₅ , the switches S ₄ b, and S ₉ to slowly reverse the direction (rotate in the counterclockwise direction) and wind the string 24. Send out string 21. In this way, the second lens group _L2 is pulled back while preventing the strings 21 and 24 from sagging. In addition, if the operation buttons 33 and 34 are pressed at the same time, the safety switch will be activated.
Due to the actions of S ₄ e to S ₄ g, the pulling back operation of the second lens group L ₂ is performed with priority.

Next, the storage operation will be explained. When photographing is completed, the focus adjustment operation buttons 33 and 34 are released from being pressed. Even if switch _S2 is turned on by pressing the collapsing operation button 32 when this photographic lens is in the focus adjustment operation position and the lens barrel is in the protruding position, switch _S7 is OFF at this time, so switch S No movement occurs due to operation ₂ , and therefore no collapsing movement occurs. When the lens barrel is in the protruding position and the first and second lens groups L ₁ and L ₂ are in the focus adjustment preparation position, switch S ₁₁ is ON and switch S ₇ is also ON, so inverter INV ₂ Output〓L″
Accordingly, transistors Q ₆ to Q ₈ are turned on. Therefore, the first motor _M1 performs a quick reverse rotation (counterclockwise rotation).
and pull back the first drive cylinder 8. When the lens barrel is in the retracted position and the photographic lenses L ₁ and L ₂ are in the retracted position,
Switches S ₈ and S ₉ are turned off, and the first and third motors M ₁ and M ₃ are stopped.

As described above, according to the camera of the present invention, the photographic lens system can be moved electrically, and the photographic lens system can be retracted to the retracted position simply by adding a single manual operation. The system is designed so that the loading can be performed only when the system is in the preparation position, and cannot be performed when the system is in the operating position, making it extremely easy to operate and preventing mistakes during shooting. Even if manual operation is performed while the lens system is in the position, the lens system will not be moved to the retracted position, so failures in photographing can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a collapsible camera according to the present invention, FIG. 2 is an external view of the collapsible camera according to the present invention, and FIG. 3 is a schematic sectional view showing the collapsible state of the photographic lens barrel. Fig. 4 is a schematic sectional view showing the protruding state of the taking lens barrel and preparation for focus adjustment of the taking lens; Fig. 5 is a schematic sectional view showing the focusing state of the taking lens; and Fig. 6 is a schematic sectional view showing the taking lens barrel and the photographing lens. FIG. 2 is a diagram showing a circuit that drives a lens group and a circuit that controls the driving. Explanation of symbols of main parts, L ₁ , L ₂ ... Photographing lens system, 31, S ₁ ... Feeding signal generating means, 33,
S ₃ a to S ₃ d... Focus adjustment signal generating means, 32, S ₂
... Retraction signal generation means, S ₇ to S ₉ , S ₁₁ ... Position detection means, M ₁ to _{M 3} , 8 to 26 ... First drive means,
FF, INV ₁ , INV ₂ , Q ₁ to _{Q 8} ...control means.

Claims (1)

[Claim for Utility Model Registration] A retracted position closest to the film side, a preparatory position extended a predetermined distance toward the subject from the retracted position, and an infinite position displaced from the preparatory position for focus adjustment. A photographing lens system that is movable between operating positions to focus on objects in a near range from far away, a feed signal generating means that generates a feed signal in response to manual operation, and a focus adjustment signal in response to manual operation. a focusing signal generating means for generating a focusing signal in response to a manual operation; and a focusing signal generating means for generating a focusing signal in response to a manual operation; a position detection means that generates a preparation position detection signal when in the preparation position and an operation position detection signal when in the operation position; and an electric drive source, and the drive source moves the photographing lens system to each of the positions. and a control means for controlling the drive means, and when the control means detects both the retracting position detection signal and the retracting signal, the control means activates the drive means to perform the photographing. When the lens system is extended to the preparation position and both the preparation position detection signal and the focus adjustment signal are detected, the driving means is activated to displace the photographic lens system to the operation position, and the preparation position detection signal and the focus adjustment signal are activated. When both the retracting signal is detected, the driving means is activated to retract the photographing lens system to the retracting position, and when both the operation position detection signal and the retracting signal are detected, the driving means is activated. An electric lens camera characterized by prohibiting operation of the camera.