JPS6226743Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a camera in which the taking lens system is movable to at least three positions, and more specifically, the taking lens system is placed in a first position closest to the film side, and in the first position. The present invention relates to a camera that is movable between a second position extended toward a subject and a third position displaced from the second position. Conventionally, so-called collapsible cameras have been known as cameras whose photographic lens systems can take the above-mentioned positions. The taking lens system of a conventional collapsible camera is housed in the camera body when it is in the first position, and when shooting, the taking lens system is extended from the first position to the second position, and then the taking lens system is moved to the second position. Focus adjustment was performed by moving the lens from the center to the third position. A collapsible camera of this type was disclosed in Japanese Utility Model Application Publication No. 56-35624. The collapsible camera disclosed in the publication is equipped with a guide member that converts the motion in the optical axis direction when collapsing the photographic lens system into rotational motion, and the distance ring for focus adjustment is rotated by the action of this guide member. The focus position of the camera is set to the normal focus position, and when shooting with the camera lens system protruding, the camera lens system is focused (focusing).
This reduces the need to do this. 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 it is difficult to operate. I had a problem with my sexuality.

An object of the present invention is to provide a camera with excellent operability.

To this end, the camera of the present invention supplies the driving force for moving the photographing lens system to each of the above positions from an electric drive source, and furthermore, the camera moves from the third position to the second position and then to the first position.
a first driving means that requires only a single manual operation to move the photographing lens system to the position, and that moves the photographing lens system between the first position and the second position using an electric drive source; and second drive means for moving between the second position and the third position by an electric drive source, and the second drive means and the first drive means are sequentially operated in response to the single manual operation. by moving the photographing lens system from the third position to the first position.
It is designed to retract into position.

Therefore, the operation is extremely simple, and since both driving means are not driven at the same time, the load on the power source is reduced, and a relatively small power source is required. Furthermore, the first driving means can also be used to drive the photographic lens system between the second position and the third position during photographing, so that the first driving means can be used to drive the photographic lens system from the third position to the first position. If we compare the case where the means and the driving means for moving from the third position to the second position are arranged side by side, there is also an advantage that the structure is simple.

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

The first position (third position) closest to the film side
), a second position extended toward the subject from the first position (Fig. 4), and a third position displaced from the second position (Fig. 5). A lens system L ₂ , a retraction signal generating means 32, S ₂ that generates a retraction signal when manually operated, and a first position detection signal (S _{8 )} when the photographing lens system is in the first position. , S ₉ is OFF),
When in the second position, the second position detection signal (S ₁₀ is OFF, S ₁₁ is ON) is transmitted, and when in the third position, the third position detection signal (S ₁₀ is ON, S ₁₁ is ON) is transmitted.
position detection means S ₈ to _{S 11} that generate OFF) respectively.
and first drive means M ₁ , M ₃ , 8 including electric drive sources M ₁ , M ₃ , which move the photographic lens system between the first position and the second position.
- 19, 24 to 26, and a second drive means M2, which includes electric drive sources _M2 and _M3 , and moves the photographing lens system between the second drive means and the third position by _the drive source. _M3 ,
20 to 26), and control means (FF, _INV2 , _Q6 to
_Q12 ), the control means operates the second drive means to move the photographing lens system toward the second position when both the retraction signal and the third position detection signal are detected. and when both the loading signal and the second position detection signal are detected, the first driving means is operated instead of the second driving means to start moving the photographic lens system toward the first position. and when both the retraction signal and the first position detection signal are detected while the photographic lens system is moving, the movement of the photographic lens system is stopped.

Hereinafter, the present 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 7 is provided on a substrate 6 fixed to the camera body so as to protrude in the direction of the optical axis 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 holding frame 10 that holds L ₁ is fixed to a rising portion 9 a of the support plate 9 . The guide bar 7 and the first driving barrel 8 constitute a first sliding means for driving the lens barrel. A second drive barrel 1 is provided on the outer periphery of the first drive barrel 8.
1 is fitted and can be slid in the optical axis direction.
A holding frame 12 that holds the second lens group L ₂ is fixed to a rising portion 13 that projects from the second drive barrel 11 . Members 8 to 13 are the second parts that drive the photographic lens.
It constitutes a sliding means.

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. A pulley 15 is attached to the first motor _M1 via a speed reduction mechanism (not shown).
The string 16 is wound around the pulley 15 multiple times, and one end of the string 16 is fixed to the support plate 9 via rollers 17 and 18, and the other end is fixed to the support plate 9 via rollers 19 and the first
It is fixed to the support plate 9 via the tip of the column.
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 is stretched between the rotating shaft of the second motor M ₂ and the second driving barrel 11 via the rollers 22 and 23 and the tip 20a of the second support.
The string 24 is stretched between the rotating shaft of the third motor M ₃ and the second drive cylinder 11 via rollers 25 and 26 . The motors M ₁ to _{M 3} are power sources for driving the lens barrel and the photographic lens, and the strings 16, 21,
24 is a flexible means for transmitting driving force from this power source to the lens barrel and lens. Interruption member 28
is arranged at a portion facing the rising portion 13 of the support plate 9, and the first lens group L ₁ and the second lens group L ₂
the closest position (focus adjustment preparation position)
At this time, the movement of the support plate 9 protruding in the optical axis direction is transmitted to the rising portion 13.

The electrode P ₁ arranged on the support plate 9 and the electrodes P ₂ and P ₃ arranged on the first support 14 constitute a switch that detects whether the photographing lens barrel is in the retracted position or in the extended position. ing. 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. Electrode P ₄ placed on the second drive tube 11 and electrode placed on the second pillar 20
P ₅ and P ₆ 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.

Fig. 3 is a schematic sectional view showing that the taking lens barrel is in the retracted position and the taking lens system L is in the first position closest to the film side, and Fig. 4 is a schematic sectional view showing that the taking lens barrel is in the protruding position. Yes, shooting lens system L ₂
FIG. 5 is a schematic cross-sectional view showing a state in which the lens barrel is in the protruding position and the photographing lens system L ₂ is in the focus adjustment preparation position, which is the second position extended from the first position. FIG. 3 is a schematic cross-sectional view showing the focus adjustment operation position as a third position displaced from the second position.

The operation will be explained below. Although FIG. 1 shows a state in which the photographic lens barrel is in the protruding position and the photographing lens is in the focus adjustment operation position, when it is in the retracted position shown in FIG. 3, the situation is as follows. That is,
The first motor _M1 has finished rotating counterclockwise and is stopped due to the contact between the electrodes _P1 and _P2 . 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, and the first driving cylinder 8 moves on the guide bar 7 between the electrodes _P1 and P2 _.
is pulled back until it makes contact. On the other hand, the second motor M ₂ has finished rotating counterclockwise, and the string 21 is connected to the rotation axis of the second motor M ₂ and the second drive cylinder 1.
A predetermined amount of slack is provided between the 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 interrupted by the interruption 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 position shown in FIG. At this time, the first and second lens groups
L ₁ , L ₂ are in focus readiness, electrodes P ₄ and P ₅
is in contact with.

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 and string 2
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 operation button 33, the motor
The rotation of M ₂ and M ₃ stops. 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 operation positions shown in FIGS. 1 and 5. At this time, when the electrode P ₄ contacts the electrode P ₅ or P ₆ , the motors M ₂ and M ₃
stops rotating in the direction of the contact. In other words, a limit is applied.

Next, when the collapsing operation button 32 is pressed for a moment while in the focus adjustment operating position or the protruding position, the photographing lens is automatically returned to the collapsing position in either state.

FIG. 6 is a diagram of a circuit for driving the photographing lens barrel and lens group, and a circuit for controlling the drive 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. Collapsible barrel switch S ₂ is collapsible barrel operation button 32
Turns on when pressed, turns off when released. 1st to 4th
The feed switches S ₃ a to S ₃ d are turned on when the operation button 33 is pressed, and turned off when the pressure is released. The first to fourth pullback switches _S4a to _S4d are turned on by pressing the operation button 34,
Turns OFF when pressure is released. 1st to 3rd safety switch
S ₄ e to S ₄ g are turned OFF when the operation button 34 is pressed, and turned ON when the button 34 is released. The first collapsing detection switch _S5 consists of pins _P1 and _P2 shown in the first diagram.When the photographic lens barrel is in the collapsible position, the pins _P1 and _P2 are in contact, so it is ON, and when the lens barrel starts to protrude from the collapsing position, the pin P is turned on. ₁ and P ₂ are separated, so
It becomes OFF. The second collapsing detection switch _S8
Turns on and off in the opposite phase to collapsing detection switch _S5 .
When the first protrusion detection switch _S6 reaches the protrusion position,
OFF.Before that, it is ON. The second and third protrusion detection switches S ₇ and S ₉ consist of pins P ₁ and P ₃ shown in the first diagram, and the pins P 1 and P ₃ are in opposite phase to the first protrusion detection switch S ₆ .
Turns ON and OFF when P ₃ contacts and leaves. switch
S ₁₀ is OFF when the photographic lens is in the focus adjustment preparation position.
It is ON when in the focus adjustment operation position. The switch _S11 is composed of pins _P4 and _P5 , and is turned on and off by the contact and separation of the pins _P4 and _P5 , which are in opposite phase to the switch _S10 .

Now, when the barrel is in the retracted position, 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 flip-flop is set by the output of the differential circuit consisting of C ₁ and resistor R ₁ , and the output Q is set to “H”.
, and outputs “L” to the output. inverter
Transistor Q ₁ is turned on by the “L” output of INV ₁ . 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 position, switches S ₇ and S ₉ are in the OFF state, so the motor is not activated. M ₂ and M ₃ are not energized and the focus adjustment operation 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 projecting position is reached, switch _S6 is turned off, transistors _Q1 to _Q5 are turned off, and the first and second transistors are turned off.
The third motor _M3 stops. Furthermore, when the projecting position is present, 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 the safety switches S ₄ e ~ S ₄ g are also ON. Therefore, the second motor M ₂ switches S ₃ a,
Power is supplied via S ₄ e, S ₃ b, and S ₉ , and the third motor M 3 quickly rotates forward (clockwise) to wind up the string 21. In addition, the third motor M ₃ is connected to switches S ₄ f, S ₃ c, and a resistor. R ₄ , switch
Since power is supplied through S ₃ d, S ₄ g, and S ₉ , it rotates slowly 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 _M2 is supplied with power via the switch _S4a , the resistor _R5 , the switches _S4b and _S9 , and rotates in a slow reverse direction (counterclockwise rotation) to wind up 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 storing operation, which is a feature of the present invention, will be explained. When shooting is completed, focus adjustment operation button 33,
34 is released. When the switch S 2 is turned on by pressing the collapsible operation button ₃₂ in this protruding position or the focus adjustment operation position (since the switch S ₇ is on at this time), the capacitor C ₂ and the resistor
The RS flip-flop FF is reset by the output of the differentiating circuit consisting of _R2 , and the output Q is set to "L".
The output is "H". At this time, if the first and second lens groups L ₁ and L ₂ are in the focus adjustment preparation position, the switch S ₁₀ is OFF and the switch S ₁₁ is ON, so the output "L" of the inverter INV ₂ is turned on. As a result, transistors _Q6 to _Q8 are turned on. Therefore, the first
The motor _M1 performs a quick reverse rotation (counterclockwise rotation) to pull back the first drive cylinder 8. At the same time, transistors Q ₉ and Q ₁₀ are also turned on, and the third motor M ₃ further quickly reverses rotation (clockwise rotation) to further pull back the second drive cylinder 11 . At this time, the second support column 20 is also pulled back together with the first drive cylinder 8, so that the string 21 becomes slack. When the barrel reaches the retracted position, switches S ₈ and S ₉ are turned OFF and the first and third motors are turned off.
M ₁ and M ₃ are stopped.

On the other hand, when the first and second lens groups L ₁ and L ₂ are in the focus adjustment operation position, the switch S ₁₀ is turned on and the switch is turned on.
Since S ₁₁ is OFF, transistors Q ₁₁ and Q ₁₂ are turned ON by the output “L” of inverter INV ₂ to slowly reverse the second motor M ₂ (rotate counterclockwise), and transistor Q ₉ , _Q10 are turned on, the third motor _M3 is rapidly reversed (rotated clockwise), and the second lens group _L2 is pulled back in the same manner as described above. When the focus adjustment preparation position is reached, the switch _S10 is turned off, the switch _S11 is turned on, and the collapsing operation is performed in the same manner as described above.

As described above, according to the present invention, after the shooting is completed,
In order to improve portability, the operation required to retract the photographic lens system _L2 to the first position (retractable position) with the smallest amount of protrusion can be done with just one touch (pressing the retractable operation button 32). It is extremely simple. Further, the photographing lens system is moved between the first position and the second position.
first driving means M ₁ , M ₃ , 8 to 19, 24 to 26 for moving between the first and second positions (focus adjustment preparation position);
Second driving means M ₂ , M ₃ , 20 to move between the second position and the third position (focus adjustment operation position)
26 are operated sequentially, the load on the power supply is reduced compared to the case where both drive means are operated simultaneously, and a relatively small power supply is required. Furthermore, since the second driving means can also be used for focus adjustment, there is an advantage that the configuration can be simple.

In the above embodiments, the focus was adjusted by moving the photographic lens system from the second position to the third position, but the present invention is not limited to this, and for example, focal length switching (zooming), etc. You may also do this.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the structure of the retractable camera according to the present invention, Fig. 2 is an external view of the retractable camera according to the invention, and Fig. 3 is a schematic diagram showing the state in which the photographic lens barrel is in the retracted position. 4 is a schematic sectional view showing a state in which the photographing lens barrel is in the protruding position and the photographing lens is in the focus adjustment preparation position; FIG. FIG. 6, which is a schematic cross-sectional view showing the state in the operating position, is a diagram showing a circuit for driving the photographing lens barrel and the lens group, and a circuit for controlling the driving. Explanation of symbols of main parts, L ₂ ... photographing lens system, 32, S ₂ ... renormalization signal generation means, S ₈ to _{S 11} ...
...Position detection means, M ₁ , M ₃ , 8-19, 24-2
6...first driving means, _M2 , _M3 , 20-26...
Second driving means, FF, INV ₂ , Q ₆ to Q ₁₂ ... control means.

Claims (1)

[Claims for Utility Model Registration] 1. A first position closest to the film side, a second position extended toward the subject from the first position, and a third position displaced from the second position. a photographic lens system movable to a position; a retraction signal generating means that generates a retraction signal when manually operated; and a first position detection signal when the photographic lens system is in the first position; a position detection means that generates a second position detection signal when the second position is located, and a third position detection signal when the third position is located; a first driving means for moving the photographic lens system between the first position and the second position; and an electric driving source for moving the photographic lens system between the second position and the third position. a second drive means; and a control means for controlling the operation of the photographing lens system via both drive means, and when the control means detects both the loading signal and the third position detection signal, When the second drive means is operated to start moving the photographic lens system toward the second position, and both the retraction signal and the second position detection signal are detected, the second position detection signal is detected.
The first driving means is operated instead of the driving means to start moving the photographing lens system toward the first position, and while the photographing lens system is moving, the retraction signal and the first position are controlled. An electric lens camera characterized in that the movement of the photographing lens system is stopped when both the detection signal and the detection signal are detected. 2. The electric lens camera according to claim 1, wherein the photographing lens system adjusts focus by moving between the second position and the third position. 3. The electric lens camera according to claim 1, wherein the photographic lens system changes its focal length by moving between the second position and the third position.