JPH0334739Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric lens camera in which a photographing lens system can be electrically driven between a plurality of positions.

2. Description of the Related Art Conventionally, a so-called collapsible camera is known as a camera in which a photographing lens system can take a plurality of positions.
In conventional collapsible cameras, the photographing lens system is housed within the camera body when it is in the retracted position, making it impossible to take pictures. For photographing, the photographic lens system is extended from the retracted position to the first extended position, and then the photographic lens system is advanced from the first extended position to the second extended position.
The focus was adjusted by moving the lens to the extended position.
However, since the driving force for moving the photographing lens system to each position was manually required, the operation was complicated.

The purpose of this invention is to improve operability by moving the photographic lens system to each position entirely electrically, and furthermore, the purpose of this invention is to improve operability by moving the photographic lens system to each position electrically. To provide an electric lens camera that can be electrically retracted to a retracting position by operation.

In order to achieve this purpose, the motorized lens camera of the present invention has a photographic lens system that includes a last lens _L1 closest to the image side and a front lens _L2 closest to the subject side.
L ₁ , L ₂ and an electric drive source (M ₁ , M ₂ , M ₃ ), the drive source drives the photographic lens system such that the front lens is closest to the image side and the distance between both lenses is the shortest. A state in which photography becomes impossible (Figure 3)
and a first extended state (FIG. 4) in which at least the foremost lens is extended a predetermined distance toward the subject from the retracted state (FIG. 4), and the distance between the two lenses is changed from the first extended state. The driving means (M ₁ , M ₂ , M ₃ , 8 to 26, 2
8), when the photographing lens system is in the extended state, the retracting detection signal (S ₈ and S ₉ are OFF) is set to the first
When in the feeding state, the first feeding detection signal ( _S10 is
OFF, S ₁₁ is ON), and when in the second feeding state, the second feeding detection signal (S ₁₀ is ON, S ₁₁ is ON).
state detection means (S ₈ , S 8 ,
S ₉ , S ₁₀ , S ₁₁ ), a retraction start signal generating means 32, S ₂ that generates a retraction start signal (S ₂ is ON) in response to manual operation, and a control means that controls the drive means. and when the first feeding detection signal and the feeding start signal are detected together, and when the second feeding detection signal and the feeding start signal are both detected, in both cases, control means (FF, INV ₂ , Q ₆ -
_Q12 ).

Hereinafter, the present invention will be explained based on examples. FIG. 1 is a perspective view of 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 (not shown) as a driving source to rotate the spool 3 and wind the film through a mechanism (not shown) prior to each photographing operation. The film rewind system 5 uses, for example, the rotation of a rewind crank (not shown) as a driving source to rewind the film after the photographing is completed via a mechanism (not shown).

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 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 _L2 has a rising portion 13 that projects from the second drive barrel 11.
Fixed.

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,
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 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 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 connects the rotating shaft of the third motor _M3 and the second drive cylinder 1.
1 through rollers 25 and 26. The relay member 28 is disposed at a portion facing the rising portion 9a of the support plate 9, and is connected to the first lens group.
When L ₁ and the second lens group L ₂ are in the closest state (focusing standby 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 2 and 3 constitute a switch that detects whether the photographing lens is in the retracted state or in the protruded state. When the electrodes P ₁ and P ₂ are in contact, it is in the retracted state, and when the electrodes P ₁ and P ₃ are in contact, it is in the protruded state. 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 touch, they are at close range, and when electrodes P ₄ and P ₅ touch, 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 focusing can be performed 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. There are also focusing operation buttons 33 and 34 on the front of the camera body.
is located. The second lens group L ₂ is extended by operating the operation button ₃₃ , and is pulled back by scanning the scan button 34. A photographic lens storage frame 36 is provided protruding from the front surface of the camera body.

FIG. 3 is a schematic cross-sectional view showing the photographic lens in a retracted state, FIG. 4 is a schematic cross-sectional view showing the photographic lens in a protruding state, and FIG. 5 is a schematic cross-sectional view showing the photographic lens in a focusing state.

In the storage state shown in FIG. 3, the front lens L ₂ of the photographing lens is closest to the image side, and the last lens L ₁ is the closest to the image side.
This is one mode of a retracted state in which the distance between the two images becomes the shortest and photographing is impossible. The protruding state shown in FIG. 4 is as follows:
This is one mode of the first extended state in which at least the foremost lens L ₂ is extended a predetermined distance toward the subject from the retracted state to enable photographing. The focusing state shown in FIG. 5 is an aspect of the second extended state in which the interval between both lenses is changed from the first extended state to change the photographic effect.

The operation will be explained below. FIG. 1 shows the focusing state after the photographic lens is in the protruding state, but when it is in the retracted state shown in FIG. 3, it 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 string 16
One side is wound around the pulley 15, and the other side is sent out from the pulley 15, and the first driving cylinder 8 is pulled back on the guide bar 7 until the electrodes _P1 and _P2 come into contact with each other. On the other hand, the second motor _M2 has finished rotating counterclockwise, and the string 21 is connected to the second motor M2.
A predetermined amount of slack is provided between the rotating shaft of M ₂ and the second drive cylinder 11 . Further, the third motor _M3 has finished rotating clockwise, and the string 24 is
It is wound around the rotating shaft by the total amount of movement of the drive barrel 11 in the optical axis direction. The mirror 2 is retracted to the rear so that it is parallel to the film surface. Now, when the projecting operation button 31 is pressed for a moment in the stored state shown in Fig. 3, the first motor shown in Fig. 1 is activated.
_M1 rotates clockwise, winds the other end of the string 16 around the pulley 15, and sends out the other end. Therefore, the first drive barrel 8 slides on the guide bar 7 so as to protrude in the optical axis direction (toward the right in FIGS. 1 and 2). Since the sliding movement of the first drive barrel 8 is also transmitted to the rising portion 13 by the relay member 28, the second drive barrel 1
1 also stands out. At this time, the third motor _M3
rotates counterclockwise to send out the string 24. Further, the slack of the string 21 decreases as the second drive cylinder 11 protrudes. As the above operations progress, the electrode
When P ₁ and P ₃ come into contact, the first and third motors M ₁ and ₃ stop rotating. This is the protruding state shown in FIG. At this time, the first and second lens groups L ₁ and L ₂ are in a focusing waiting 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 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 M ₂ ,
M ₃ K rotation 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 is the focusing state shown in FIGS. 1 and 5. At this time, the motors M ₂ and M ₃ whose electrode P ₄ contacts the electrode P ₅ or P ₆ stop rotating in the direction in which the contact was made. In other words,
A limit is applied.

Next, when the storage operation button 32 is pressed for a moment while in the focusing state or the protruding state, the photographing lens is automatically returned to the storage state in either state.

FIG. 6 is a diagram of a circuit for driving the photographing lens and lens group, and a circuit for controlling the driving circuit, which realizes the above operation. In Figure 6, the protruding switch
_S1 is turned on when the protruding operation button 31 is pressed, and turned on when the pressure is released.
Turn off. The storage switch _S2 is turned ON when the storage operation button 32 is pressed, and turned OFF when the storage operation button 32 is released. The first to fourth feed switches S ₃ a to S ₃ d are operated by pressing the operation button 33.
ON, turns OFF when 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 stability switch
S ₄ e to S ₄ g are turned OFF when the operation button 34 is pressed, and turned ON when the button is released. The first stowage detection switch _S5 is turned on when the photographing lens is in the stowed state, and turned off when it starts to protrude from the stowed state. 2nd storage detection switch S ₈
is ON in the opposite phase to the first storage detection switch _S5 ,
Turn off. The first protrusion detection switch _S6 is OFF when the protrusion state is reached, and is ON before that. 2nd, 3rd
Protrusion detection switches S ₇ and S ₉ are the first protrusion detection switches
Turns on and off in opposite phase to _S6 . Switch S ₁₀ is OFF when the photographic lens is in the focusing preparation position.
It is ON when in focusing state. Switch _S11 is a switch that turns on and off in opposite phase to switch _S10 .

Now, when the switches S ₅ and S ₆ are in the stored state,
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
Trinestor 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.

On the other hand, since switches S ₇ and S ₉ are OFF when in the retracted state and until the ejection operation is completed, the operation button 32
Even if ~34 is pressed by mistake, the second and third motors M ₂ ,
M ₃ malfunctions are prevented.

When the protruding state is reached, switch _S6 is turned off, transistors _Q1 to _Q5 are turned off, and first to third motors _M3 are stopped. In addition, when in the protruding state, switches S ₇ and S ₉ are turned on. Therefore,
When only the operation button 33 is pressed, switches S ₃ a to _{S 3}
d is ON, and the safety switches S ₄ e to S ₄ g are also ON. Therefore, the second motor _M2 is connected to the switch _S3a ,
Power is supplied via 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 M ₃ is supplied with power via switches S ₄ f, S ₃ c, resistor R ₄ , switches S ₃ d, S ₄ g, and S ₉ , it further slowly rotates forward (counterclockwise). In this way, while preventing the strings 21 and 24 from sagging, the second lens group
L ₂ is rolled out. When the operation button 33 is released from this extended state, the switches S ₃ a to S ₃ d are activated.
The second and third motors M ₂ and M ₃ stop rotating. Next, by pressing the operation button 34, the switch _S4
When 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 quick reverse rotation (clockwise rotation). ) to wind up the string 24, and the second motor _M2 is switched to the switch _S4.
Power is supplied via resistor R ₅ , switches S ₄ b and S ₉ to slowly reverse rotation (counterclockwise rotation) and send out the string 21. In this way, the second lens group _L2 is pulled back while preventing the strings 21 and 24 from sagging. still,
When the operation buttons 33 and 34 are pressed at the same time, the action of the safety switches S ₄ e to S ₄ g gives priority to the retraction operation of the second lens group L ₂ .

Next, the storing operation, which is a feature of the present invention, will be explained. When the photographing is completed, the pressing of the focusing operation buttons 33 and 34 is released. When the switch S 2 is turned on by pressing the storage operation button 32 in the first extended state of the protruding state or _{the second} extended state of the focusing state (at this time, the switch S ₇ is turned on).
The RS flip-flop FF is reset by the output of the differentiating circuit consisting of capacitor C ₂ and resistor R ₂ (since it is ON), and the output is “L” and the output is “H”.
Output. At this time, the first and second lens groups L ₁ ,
If L ₂ is ready for focusing, switch
Since _S10 is OFF and switch _S11 is ON, transistors _Q6 to _Q8 are turned ON by the "L" output of inverter _INV2 . Therefore, the first motor _M1 performs a quick reverse rotation (counterclockwise rotation) to pull back the first drive cylinder 8. At the same time, the transistor
Q ₉ and Q ₁₀ are also turned ON, and the third motor M ₃ further rapidly reverses rotation (clockwise rotation) and further pulls the second drive cylinder 11 back. At this time, the second driving cylinder 8 is integrated with the first driving cylinder 8.
Since the strut 20 is also pulled back, the string 21 becomes slack. Then, when the storage state is reached, the switches S ₈ and S ₉ are turned off, and the first and third motors M ₁ ,
_M3 stops.

On the other hand, when the first and second lens groups L ₁ and L ₂ are in the focusing state, the switch S ₁₀ is ON and the switch S ₁₁ is OFF, so the transistor Q ₁₁ is turned on by the "L" output of the inverter INV ₂ . , Q ₁₂ turns ON and the second motor M ₂ is slowly reversed (counterclockwise rotation).
and turn on transistors Q ₉ and Q ₁₀ again to turn on the third transistor.
Fast reverse rotation (clockwise rotation) of motor _M3
Pull back lens group _L2 in the same manner as described above. When the focus is ready, the switch S ₁₀ turns off.
The switch _S11 is turned on and the storage 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 to the retracted state with the smallest protrusion (in this embodiment, the retracted state) is a one-touch operation (in this embodiment, pressing the lens storage button 32). ) and
Furthermore, the same operation is required whether the photographing lens system is in the first extended position (focusing preparation state in this example) or the second extended position (focusing state in this example), making the operation extremely easy. It's 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, the focal length can be changed (zooming), etc. You can go.

[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, Fig. 3 is a schematic sectional view showing the storage state of the photographic lens, and Fig. 4 The figure is a schematic cross-sectional view showing the protruding state of the photographic lens, FIG. 5 is a schematic cross-sectional view showing the focusing state of the photographic lens, and FIG. 6 is a circuit that drives the photographic lens and lens group, and a circuit that controls the driving. FIG. Explanation of symbols of main parts, L ₁ , L ₂ ... Photographing lens system, 32, S ₂ ... Renormalization signal generation means, S ₈ , S ₉ ,
S ₁₀ , S ₁₁ ... position detection means, M ₁ , M ₂ , M ₃ , 8 ~
26, 28...driving means, FF, INV ₂ , Q ₆ to _{Q 12}
...control means.

Claims (1)

[Claims for Utility Model Registration] 1. A photographing lens system including a final lens closest to the image side and a foremost lens closest to the object side; and an electric drive source, which drives the photographic lens system to the frontmost lens. A retracted state in which the lens is closest to the image side and the distance between the two lenses is the shortest, making photography impossible; and a retracted state in which at least the foremost lens is extended a predetermined distance toward the subject from the retracted state, in which photographing is not possible. a driving means for moving between a first extended state in which the photographing lens system is enabled and a second extended state in which the distance between the two lenses is changed from the first extended state to change the photographic effect; State detection means that generates a carry-in detection signal when in the carry-in state, a first feed-out detection signal when in the first feed-out state, and a second feed-out detection signal when in the second feed-out state. and a retraction start signal generating means for generating a retraction start signal in response to manual operation, and a control means for controlling the drive means,
In both cases, when the control means detects both the first feeding detection signal and the feeding start signal, and when detecting both the second feeding detection signal and the feeding start signal, An electric lens camera characterized in that the photographing lens system is moved toward the retracted state, and the movement is stopped in response to detection of the retracting detection signal. 2. The electric lens camera according to claim 1, wherein the photographing lens system changes its focal length by moving between the first extended state and the second extended state. 3. The electric lens camera according to claim 1, wherein the photographing lens system changes focus adjustment by moving between the first extended state and the second extended state.