JPS6331047Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides a variable-focus camera that can be switched to at least two different focal lengths by switching the optical system, and a protective cover (barrier) that opens and closes in front of the photographic lens, which is the photographic optical system. Regarding the built-in camera.

2. Description of the Related Art Various so-called variable focus cameras that can switch between at least two types of focal lengths by switching optical systems have been proposed. On the other hand, various cameras have been proposed in which the lens cap is eliminated and a barrier that opens and closes in front of the lens is incorporated in place of the lens cap in order to make the camera more compact and to improve operability. Therefore, various proposals have been made in which such a barrier is incorporated into the variable focus camera. Among these proposals, there is a variable focus camera with a barrier (hereinafter also referred to as a camera) in which the main switch of the camera is linked to the opening and closing of the barrier. As this method,
For example, some cameras are equipped with a switch that activates the main circuit of the camera when the barrier is fully opened. However, in cameras using this type of system, the barrier can be opened even if the focus switching operation of the optical system is in progress or the switching operation has not been completed, so the optical system is ready for shooting. The barrier opens even though it is not set. For this reason, a switch is turned on to operate the main circuit of the camera, causing the main circuit to operate, resulting in the photographer taking out-of-focus photographs. In addition, if you switch the optical system with the barrier open, the barrier will remain open even if the optical system is in the middle of switching or has not yet been completed, so the focus will remain open. It was not possible to confirm whether the distance switching operation was completed by checking the open/closed state of the barrier.

The present invention was developed in view of the above circumstances, and includes a photographic optical system with a variable focal length, a protective cover that protects the photographic optical system and can be opened and closed, an operating means for opening the protective cover, and the above-mentioned. a determining means for determining whether the photographing optical system is in the process of changing the focal length; and, in response to the determining means, when the photographing optical system is in the process of changing the focal length, the above-mentioned protection takes precedence over the action of the operating means; A control means for prohibiting the release of the cover or for closing the protective cover in the open state is provided, and the control means is provided to notify the photographer that the focal length switching operation is in progress or incomplete, thereby preventing wastage of film and preventing the wastage of valuable film. The aim is to provide a camera that will not miss any important shooting situations.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a basic circuit diagram used in a variable focus camera with a barrier according to the present invention.
In the example shown in FIG. 1, 6 is a control means for closing the barrier, and is a logic circuit as described below, which has terminals 1', 2', 3', and 4' on the input side, and a terminal 5' on the output side. ，
6'. The output signal of this logic circuit 6 is applied to the motor 5 via output side terminals 5', 6' and a motor drive circuit 8. 1, 2, 3, and 4 are switches, one end of which is commonly grounded, and the other end connected to pull-up resistors 16, 17, 18, 19 and input terminals 1', 2', 3', and 4' of the logic circuit 6. are connected to each other. In addition, pull-up resistor 16,1
The other ends of 7, 18, and 19 are commonly connected to a power supply V and voltage is applied thereto. Further, the switch 1 is closed when a barrier (not shown) is fully closed, and is open at other times. Switch 2, which is a determining means for determining whether the photographic optical system is in the process of changing the focal length, is opened during or incompletely during the focal length switching operation of the optical system, and when the focal length switching operation is completed. Close. The switch 3, which is an operation means for opening the barrier (not shown), is linked with a barrier opening/closing knob (not shown) that is manually operated to open/close the barrier, and the barrier opening/closing knob is set to the opening side to open the barrier as described below. It opens when the barrier is set to the closed side, and closes when the barrier is set to the closed side. The switch 4 is closed when a barrier (not shown) is fully open, and is open at other times.

FIG. 2 is an explanatory diagram showing the principle of the mechanism of the variable focus camera with a barrier according to the present invention using the circuit shown in FIG. In this figure, components that are the same as those in FIG. 1 are designated by the same numbers. In the illustrated example in FIG. 2, 11 is a barrier, and the solid line shows the state in which the barrier 11 is placed behind and covers the main lens system 10, etc. surrounded by the dotted line, that is, the state in which the barrier 11 is closed. . Reference numeral 12 designates a gear portion that is integrally formed with the barrier 11 and is rotatably provided around a shaft 14 . 13 is a transmission gear, shaft 15
It is rotatable around , and meshes with the gear portion 12 of the barrier 11. Reference numeral 5 denotes a motor for opening and closing the barrier 11, and transmits torque to the transmission gear 13 via a gear 5' provided on a rotating shaft.
Reference numeral 7 designates a barrier opening/closing knob for opening and closing the switch 3 in FIG. 1, and when it is moved in the direction of arrow P in the figure and set, the switch 3 in FIG. 1 is opened.
Conversely, when the switch 3 is moved in the direction of the arrow Q and set, the switch 3 shown in FIG. 1 is closed. Reference numeral 6 denotes the logic circuit shown in FIG. 1, which controls the motor 5 to be energized or de-energized, and to control forward or reverse rotation of the motor 5.

1 is a switch which closes only when the barrier 11 is fully closed and opens otherwise. Reference numeral 4 denotes a switch, which is closed only when the barrier 11 is fully open, as shown by the two-dot chain line, and is otherwise open.

FIG. 3 is a simplified diagram for explaining in detail the principle circuit diagram shown in FIG. 1 for driving the barrier of the variable focus camera with barrier of FIG. 2. FIG. Third
In the illustrated example, the top row numbers 1 to 6 and 1'
~4' are the switches shown in Figures 1 and 2,
Numbers are used to indicate the power-on output side of the motor and logic circuit, and the input side terminal of the logic circuit, and the numbers in the figures correspond to each other. In the figure, the number "1" indicates when the output from the power-on output side of the switches 1 to 4 and the logic circuit 6 is at a "high" level.
Furthermore, the number "0" indicates when these outputs are at a "low" level. Here, switch type 1~
The output signal of 4 is the input side terminal 1' of the logic circuit.
It is the same as the signal applied to 4'. Also, motor 5
When the direction of rotation is forward, it is referred to as "forward," and when it is reversed, it is referred to as "reverse." In the figure, A, B at the left end,
B', C, D, D', E, F, G, and G' indicate the above-mentioned states of the mechanism of the variable focus camera with a barrier. In FIGS. 2 and 3, state A shows a state in which the barrier 11 is fully closed in a state in which the focal length switching operation of the optical system (not shown) has been completed. At this time, the barrier opening/closing knob 7 has been moved and set to the side that closes the barrier 11, that is, the side that closes the switch 3, that is, the direction of arrow Q. (Hereafter, the barrier opening/closing knob 7 is set to the closing side. ). B is set by moving the barrier opening/closing knob 7 from the state of A to the side that opens the barrier 11, that is, the side that opens the switch 3, that is, the P direction side (hereinafter referred to as the barrier opening/closing knob 7).
The barrier 11 is set to the opening side), and also shows the state when the barrier 11 starts to open. B' shows a state where the barrier 11 is partially open after state B. Similarly, C shows a state in which the barrier 11 is fully opened in a state in which the focal length switching operation of the optical system has been completed. At this time, the barrier opening/closing knob 7 is held on the opening side. D shows the state when the barrier opening/closing knob 7 is set to the closing side from the state of C, and shows the state when the barrier 11 starts to close.
D' shows a state when the barrier 11 is partially closed after state D. E shows a state in which an attempt is made to switch the focal length of the optical system from state A, but the switching operation is stopped without being completed, or in the middle of switching. F is the state when the barrier opening/closing knob 7 is further set to the open side from state E.
As in the state E, the barrier 11 does not open when the switching of the focal length of the optical system is not completed or is in the middle of switching. G shows a state when the focal length of the optical system is switched from the state of C, but the switching operation is stopped without being completed, or when the barrier 11 starts to close while the switching is in the middle. G' indicates a state in which the barrier 11 is partially closed from state G. In the transition state column, the mark "→B'" in state B indicates that the state will transition from state B to state B'.
State B' moves to the next state C, and since no transition state is described in state C, it is stopped in state C. The state of D then moves to the state of D', the state of D' then moves to the state of A, the state of G then moves to the state of G', and the state of G' then moves to the state of F. It is shown.

From this, in state A, the motor 5 is in a state in which it rotates in the opposite direction if it is energized, but the motor 5 is in a non-energized state. The states of the motor 5 in state E and state F are the same as in state A. In states B and B', the motor 5 is energized and rotates in the forward direction, thereby starting or in the process of opening the barrier 11, respectively. In state C, the motor 5 is in a state in which it rotates in the forward direction if it is energized, but the motor 5 is in a non-energized state. D,
In each state D', G, and G', the motor 5 is energized and rotates in the opposite direction, and the barrier 1
1 or start the action of closing the barrier 11.
is in the process of closing.

Next, FIG. 4 is a circuit diagram of a more specific embodiment showing the relationship between the logic circuit of FIGS. 1 and 2, the motor drive circuit, and the motor.

6 is a logic circuit, which has terminals 1', 2', 3', and 4' on the input side as in Fig. 1, and the connection relationship between these terminals and the switch in Fig. 1 is shown in Fig. 1. That's exactly what it says. Reference numeral 8 denotes a motor drive circuit, which is connected to the logic circuit via output side terminals 5' and 6' of the logic circuit 6, and this output is connected to the motor 5.
connected as given. 20 is
In the AND circuit, the input signals of terminal 4' and terminal 3'
21 is an AND circuit, NOT
The input signal at terminal 3' and the input signal at terminal 1' are ANDed via circuit 25. 22 is the same
In an AND circuit, the input signals of terminal 1' and terminal 2'
These AND circuits 20, 2
The output signals of 1 and 22 are given as input signals to the OR circuit 23. 28 is an AND circuit which ANDs the signal applied to terminal 1', the signal inputted via NOT circuit 26, and the signal applied to terminal 2'.
Output to NOT circuit 27. 29 is an AND circuit,
The signal from the NOT circuit 27 and the signal from the OR circuit 23 are input and ANDed to provide an output signal as the output of the logic circuit 6 to the terminal 6'. 24 is
The OR circuit connects the signal applied to terminal 3' to NOT circuit 2.
The signal inputted through the logic circuit 5 and the signal applied to the terminal 2' are ORed and an output signal as an output of the logic circuit 6 is applied to the terminal 5'. 31, 32, 33,
Reference numeral 34 denotes transistors connected in a bridge type, and the motor 5 is connected between these transistors. Further, the output signal of the output side terminal 6' of the logic circuit 6 is given to the emitter side of the transistors 31 and 32, and the output signal of the output side terminal 5' is also given to the emitter side of the transistors 31 and 32.
The signals are applied as they are to the base sides of transistors 31 and 34, respectively, and via the NOT circuit 30 to the base sides of transistors 32 and 33, respectively.

FIG. 5 is a simplified diagram for explaining in detail each state of each part of the logic circuit of FIG. 4. In the example shown in FIG. 5, the numbers 1 to 4 and 1' to 4' from the top to the next stage indicate the input side terminals of the switches and logic circuits shown in FIGS. 1 to 4. The numbers in the figures correspond to each other. Also,
20, 21, 22, 28, 29 are AND in Figure 4
circuit, 23 and 24 are OR circuits, 25,
26 and 27 are the numbers to indicate the NOT circuits, and 5' and 6' are the numbers to indicate the output side terminals of the logic circuit 6.
Each number corresponds to the number in FIG. 3' x 4', 1' x 25, 1' x 2', 20 in the third row from the top
+21+22,2'×26,23×27,2'+2
5 indicates each logic, for example, 3'×
4' is the AND of the signals applied to terminal 3' and terminal 4', respectively.
20+21+22 is AND circuit 2
This shows that the output signals of 0, 21, and 22 are ORed. other 1'×25, 1'×2',
Since 2'×26, 23×27, and 2'+25 are the same as above, their explanations will be omitted for simplicity. A, B, B', C, D, D', E, F, G, and G' on the left end indicate each state of the camera in the same way as above. In addition, in the figure, switches 1 to 4, AND circuits 20 to 22, 28, 29, OR circuits 23, 24,
The number "1" indicates when the output signals of NOT circuits 25, 26, and 27 and the signals at terminals 1' to 6' are at a "high" level, and when those output signals are at a "low" level. The hour is indicated by the number "0".

FIG. 6 is a schematic cross-sectional view for understanding the completion of the switching operation of the focal length of the optical system of an embodiment of the variable focus camera according to the present invention, FIG. 6 a is a standard photographing state, and FIG. 6 b is a Each shows a telephoto shooting state. In the illustrated example in FIG. 6, reference numeral 42 denotes a lens barrel that holds the main lens system 10 with the barrier 1 closed on the front surface and is fitted and supported at two points on the constituent members of the lens barrel unit 40. A bar 44 is fixed and controlled to extend linearly together with the lens barrel bar 44. Reference numeral 48 denotes an extender which holds the sub lens system 49 and is rotatable about the extender shaft 43 fitted and supported by the constituent members of the lens barrel unit 40 on the rear side of the main lens system 10 and the shutter unit 50. It's summery. 45 is a support bar,
It is fixed to the lens barrel unit 40 parallel to the photographing optical axis,
2 of the holding part 41 fixed to the front of the camera body 54
It is slidably fitted and supported at the location. Further, the lens barrel unit 40 also fits into a guide bar 47 whose both ends are fixed to the holding part 41, and with this guide bar 47 as a guide, it integrally moves with the support bar 45 in the front and back direction of the camera.
That is, it can be slid in the direction of the photographing optical axis. In the standard photographing state shown in FIG. 1a, the sub lens system 49
is retracted from the photographing optical path, but in the telephoto shooting state shown in FIG. Ru.

Reference numeral 55 denotes a dark box which is a bellows, and each end face of which is fixed between the rear end of the lens barrel unit 40 and the light-shielding frame plate 52 on the side of the camera body 54 to block light from the surroundings. It forms part of the The light shielding frame plate 52 is provided with an L-shaped protrusion 52a, and a lower surface 52b of the protrusion 52a is configured to engage with a cam (not shown) provided on the extender 48. In addition, 51 is the patrone room, 53
is a spool chamber, and 46 is a camera exterior case.
Further, although the barrier drive mechanism having the configuration shown in FIG. 2 is incorporated in the lens barrel unit 40, parts other than the barrier 11 are not shown.

FIG. 7 is a diagram showing the relationship between the moving state of the sub-lens system and the switch 2 of FIG. 1. 7a shows a standard photographing state, FIG. 7b shows a state in which the focal length switching operation of the optical system has not been completed or is in the process of being changed, and FIG. 7c shows a telephoto photographing state. Note that the states shown in FIGS. 7a and 7c show states in which the focal length switching operation of the optical system has been completed. In the example shown in FIG. 7, 58 is a camera aperture, 49 is a sub-lens system, and 48 is an extender, which is configured to be rotatable around the extender shaft 43, and is attached by a spring 57 to rotate clockwise. Forced. The extender 48, for example, has one end on the fixed side of the spring 57 grounded, and is always grounded due to electrical conduction of the spring 57, so that it constitutes one end on the ground side of the switch 2 in FIG. 56a, 56
b is a stopper of the extender 48, which is fixed to the lens barrel unit 40 in FIG. It constitutes the other end of 2. For example, as shown in FIGS. 7a and 7c, when the operation of switching the focal length of the optical system is completed, the extender 48 and the stopper 56
Since the switch 2a and 56b are in electrical contact with each other, the switch 2 in FIG. 1 is closed and grounded. Further, as shown in FIG. 7b, when the focal length switching operation of the optical system is not completed or in the middle of switching, the extender 48 and the stopper 56
Since it is not in contact with a and 56b, stopper 5
6a and 56b are electrically connected, and switch 2 in FIG. 1 is opened. 52b is the lower surface of the L-shaped protrusion 52a fixed to the light-shielding frame plate 52 in FIG. 6, and the right end thereof is gradually cut deeply to the left side from the front to the rear of the page to form a notch. . This notch provided on the lower surface 52b of the L-shaped protrusion 52a changes from the state shown in FIG. 7c (telephotography state in FIG. 6b) to the state in FIG. 7a (standard photography state in FIG. 6a). ), by pushing the cam surface 48a provided integrally with the extender 48, this notch and the cam surface 48a engage,
The cam surface 48a along the notch is connected to the extender shaft 4.
3 as a center of rotation in a counterclockwise direction against the force of a spring 57, so as to reach the state shown in FIG. 7a.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 7. First, the camera operator performs an operation to switch the focal length of the optical system. The operation of switching the focal length of the optical system from the standard photographing state to the telephoto photographing state will be described with reference to FIGS. 1, 6, and 7. First, as the camera operator moves the lens barrel unit 40 to the front side of the camera, it is necessary to position the sub lens system 49 of the extender 48 on the photographing optical axis. That is, in the standard photographing state of only the main lens system 10 shown in FIG. The lens system 49 is retracted from the aperture 58, which is the central opening on the photographing optical axis, but as the lens barrel unit 40 moves toward the front, the extender 48 and the cam surface 48a move toward the L-shaped protrusion 52.
The lower surface 52b of a is in a state of escape, but since the extender 48 is biased with rotational force in the clockwise direction when viewed from the rear side of the camera, the cam surface 48a is in contact with the lower surface 52b. The extender shaft 43 rotates clockwise around the extender shaft 43 as shown in FIG. 7b.

Furthermore, when the lens barrel unit 40 moves forward,
The extender 48 stops rotating at the position where it contacts the stopper 56a, and as shown in FIG.
Although it is set on the photographing optical axis of lens barrel unit 4,
0 still moves slightly forward, the cam surface 48a of the extender 48 no longer contacts the lower surface 52b, and the state is switched to the telephoto shooting state. As a result, the grounded extender 48 and the stopper 56a are brought into electrical contact, and the switch 2 shown in FIG. 1 is closed and grounded.

Furthermore, when switching the focal length of the optical system from the telephoto shooting state shown in FIGS. 6b and 7c to the standard shooting state shown in FIGS. 6a and 7a, the camera operator must operate the lens barrel unit 40. As the camera is moved to the rear, the sub lens system 49 of the extender 48 must be retracted from the aperture 58 of the camera. That is, in the telephoto shooting state of the main lens system 10 and the sub lens system 49 shown in FIG. 6b, the cam surface 48a of the extender 48 is not in contact with the lower surface 52b, As it moves rearward, the notch on the lower surface 52b comes into contact with the cam surface 48a, and the cam surface 48a rotates along the notch on the lower surface 52b with the extender shaft 43 as the rotation center against the force of the spring 57. Therefore, along with this cam surface 48a, the extender 48 also rotates counterclockwise around the extender shaft 43, and together with this, the sub lens system 49 also rotates in the same direction to escape from the aperture 58 as shown in FIG. 7b. do.

Furthermore, when the lens barrel unit 40 moves to the rear,
The extender 48 stops rotating at the position where it contacts the stopper 56b, and as shown in FIG.
Evacuate from 8. At this time, the light shielding frame plate 5 is placed on the high cam soft part of the cam surface 48a of the extender 48.
The lowermost surface of the lower surface 52b of the L-shaped protrusion 52a provided at 2 abuts, and the optical system is switched to the standard photographing state. As a result, as shown in FIG. 7a, the extender 48, which is grounded, and the stopper 56b come into electrical contact, thereby closing the switch 2 in FIG. 1 and grounding it. Furthermore, when there is no need to change the focal length of the optical system and the focal length change of the optical system has been completed, the state shown in FIG. 7a or 7b is maintained, so that the extender 48 and stopper 56a Alternatively, the switch 2 is in electrical contact with the switch 56b, and the switch 2 is closed and grounded.

Next, as shown above, A, B, B', C,
The operation of each state of D and D' will be explained with reference to FIGS. 1 to 7.

In state A, the barrier 11 is closed and the focal length of the optical system is switched as described above. Since the switching operation has been completed, the switch 2 is closed and grounded, and from now on " A low" level (hereinafter referred to as "0") signal is output.
Also, since the barrier 11 is closed, the switch 1 is closed and grounded, so a "0" signal is output from now on, and since the switch 4 is open, the pull-up resistor 19 causes a "high" level (hereinafter referred to as "high" level). ,
It's called "1". ) is outputting the signal. Since the barrier opening/closing knob 7 is set to the closed side, the switch 3 is closed and grounded, and a signal of "0" is output from this. The "0" signal from switch 3 is input as a "1" signal via terminal 3' and NOT circuit 25, and the "0" signal from switch 2 is input via terminal 2'. OR circuit 2
The output signal of 4 is "1", and this signal is given to terminal 5'. switch 3 and switch 4
The respective "0" and "1" signals from terminals 3',
4', the AND circuit 20 outputs a "0" signal, and the "0" signal from switch 1 and the output signal from switch 3 are connected to terminal 3' and NOT circuit 2.
It is input as a “1” signal via 5.
The AND circuit 21 outputs a "0" signal, and
The AND circuit 22 which receives the respective "0" signals from switch 1 and switch 2 via terminals 1' and 2' outputs a "0" signal. The OR circuit 23, which receives the "0" output signals of the AND circuits 20, 21, and 22, outputs a "0" signal. The AND circuit 29 inputs the "0" signal from the switch 1 as a "1" signal via the NOT circuit 26, and also inputs the "0" signal from the switch 2.
inputs the signal through terminal 2' and outputs a "0" signal, and NOT circuit 2 inputs this signal.
7 outputs a signal of "1". The AND circuit 29 inputting the “1” output signal of the NOT circuit 27 and the “0” output signal from the OR circuit 23 is “0”.
A signal is outputted to the output terminal 6' of the logic circuit 6. Since the emitter side of the transistors 31 and 32 receives the "0" signal applied to this terminal 6', the motor 5 is not energized. However, since the signal applied to terminal 5' is "1", transistor 3 which inputs this signal to the base side
1 and 34 are in a non-conducting state, and the transistors 32 and 33 input this "1" signal to the base side as a "0" signal via the NOT circuit 30.
can be in a conductive state. That is, if the motor 5 is energized, a current will flow in the direction of arrow R and it will rotate in the opposite direction, but since it is not energized, it will not rotate, so the barrier 11 remains closed. .

Next, if the barrier opening/closing knob 7 is set to the open side from state A, the state shifts from state A to state B. As a result, the switch 3 is opened, and the pull-up resistor 18 causes its output signal to become "1". The AND circuit 20 inputs the signal from the switch 4 via the terminal 4', and
Since the "1" signal from switch 3 is being input, a "1" signal is output. Also, AND circuit 2
1 connects the "1" signal of switch 3 to terminal 3' and NOT
Since the signal is input as a "1" signal through the circuit 25 and the "0" signal from the switch 1 is also input, a "0" signal is output. AND circuit 22
Since the state of is the same as the state of A, these,
The OR circuit 23 inputs the output signals "1" and "0" of the AND circuits 20, 21, and 22, respectively.
Outputs a “1” signal. The states of switch 1 and switch 2 do not change from state A, so NOT
The output signals of the circuit 26, the AND circuit 28, and the NOT circuit 27 do not change from the state A. AND circuit 2
9 is OR with the “1” output signal from the NOT circuit 27
Since the "1" output signal from the circuit 23 is input, a "1" signal is outputted and applied to the terminal 6'. The OR circuit 24 receives "1" from the switch 3.
The signal is set to "0" via terminal 3' and NOT circuit 25.
Since it is input as a signal of "0" from switch 2 via terminal 2',
A signal of "0" is output and applied to the terminal 5'. The "0" signal at terminal 5' is transmitted through transistors 31 and 3.
4 to the base side of the transistor 31,3
4 is in a conductive state and becomes “1” through the NOT circuit 30.
is applied to the base sides of the transistors 31 and 34 as a signal to make the transistors 31 and 34 non-conductive. Since the "1" signal at terminal 6' is applied to the emitter side of transistor 31, current flows in the order of transistor 31 -> motor 5 (direction of current is in the direction of arrow L) -> transistor 34 -> ground, and motor 5 becomes positive. Rotate in the direction. This torque of the motor 5 is transmitted via the transmission gear 13 and the gear portion 12 in the direction of opening the barrier 11, and the barrier 11 starts to open.

During the opening operation of the barrier 11, the state changes from state B to state B'. That is, in state B, the barrier 11
When the switch 1 is opened, the switch 1 is opened, and the pull-up resistor 16 outputs a signal of "1". This output signal of switch 1 changes the input signals of AND circuits 28, 21, and 22, but since AND circuit 28 receives the "0" signal from switch 2, its output is the same as that of switch 1. “0” without being affected by the output signal
Furthermore, since the output states of the optical systems 3 and 4 do not change from the state B, the output of the AND circuit 20 to which these output signals are input also does not change from the state B, and the AND circuit 20 outputs a "1" signal, so the OR circuit inputting the "1" signal from the AND circuit 20 outputs a "1" signal as in the state of B, regardless of the states of the AND circuits 21 and 22. It is outputting. As a result, a signal of "1" is applied to the terminal 6' without changing from the state of B. Also, the output signals of switches 2 and 3 are NOT
The output signal of the OR circuit, which is input through the circuit, is the same as the state of B, so it is "0", and this signal is given to the terminal 5'. Therefore, terminal 6',
Since the respective "1" and "0" signals applied to the terminal 5' do not change from the state of B, the motor drive circuit 8 rotates the motor 5 in the positive direction in the same way as the state of B to rotate the barrier 11. Keep opening.

As shown by the dashed line in FIG. 2, when the opening of the barrier 11 is completed, the switch 4 is closed and grounded, so a signal of "0" is outputted, and the other switches 1 to 3 are opened/closed. Since the state does not change, the state shifts from state B' to state C.

Since the switch 3 is open in the state C, a signal of "1" is outputted by the pull-up resistor 18 and applied to the terminal 3'. The "0" output signal from switch 4 is applied to switch 4'. These terminals 3', 4'
``1'' and ``0'' signals are input from
The AND circuit 20 outputs a signal of "0".
A signal of "0" is inputted from the switch 3 via the terminal 3' and the NOT circuit 25, and a signal of "1" is inputted from the switch 1, which is open and outputs a signal of "1" by the pull-up resistor 16, via the terminal 1'. The AND circuit 21 inputting the signal outputs a "0" signal. A signal of "1" is input from switch 1 through terminal 1', and switch 2 is closed and grounded.
The AND circuit 22, which receives a "0" signal from the terminal 2' through the terminal 2', outputs a "0" signal.
“0” from these AND circuits 20, 21, 22
The OR circuit 23 inputting these three signals outputs a signal of "0". Therefore, this "0" signal is input from the OR circuit 23.
The output signal of the AND circuit 29 is "0" regardless of the other input signal, and this signal is applied to the terminal 6'. The OR circuit 24 inputs the "1" signal from the switch 3 via the terminal 3' and the NOT circuit 25 as a "0" signal, and also inputs the "0" signal from the switch 2 via the terminal 2'. Therefore, a signal of "0" is output and applied to the terminal 5'. Since the "0" signal at the terminal 5' is applied to the base sides of the transistors 31 and 34, the transistors 31 and 34 can become conductive. Further, since the signal is applied as a "1" signal to the base sides of the transistors 32 and 33 via the NOT circuit 30, the transistors 32 and 33 are in a non-conductive state. However, the signal applied to the emitter side of transistor 31 via terminal 6' is "0".
Since the signal is , no current flows in the order of transistor 31 → motor 5 (in the direction of arrow L) → transistor 34 → ground. That is, if the motor 5 is energized, a current flows in the direction of the arrow L and the motor 5 rotates in the forward direction, but since the motor 5 is not energized, it stops rotating and the opening operation of the barrier 11 is stopped.

Next, when the barrier opening/closing knob 7 is set to the closed side after the barrier 11 has been completely opened in state C, the state transitions from C to state D. In state D, the open/closed states of switches 1, 2, and 4 remain unchanged from state C, with switch 1 being open and switches 2 and 4 being closed.
Switch 1 outputs a signal of "1" through pull-up resistor 16, and switches 2 and 4 are closed, so they output a signal of "0". Switch 3 is closed by the barrier opening/closing knob 7 being set to the closed side, so it is grounded and outputs a signal of "0".
The AND circuit 20 receives both signals "0" from the switches 3 and 4 via the terminals 3' and 4', respectively, and outputs a signal "0".
The AND circuit 21 receives the "0" signal from the switch 3 via the terminal 3' and the NOT circuit 25 as a "1" signal, and also receives the "1" signal from the switch 1 via the terminal 1'.
The AND circuit 22 receives a signal "1" from the switch 1 via the terminal 1',
Also, since a signal "0" is input from the switch 2 via the terminal 2', a signal "0" is output. The signals "0", "1", and "0" of these AND circuits 20, 21, and 22 are input.
The OR circuit 23 outputs a signal of "1".
The circuit 28 receives a signal "1" from the switch 1 via the terminal 1' and the NOT circuit 26 as a signal "0", and also receives a signal "0" from the switch 2 via the terminal 2', so that its output signal is "0".
The "0" signal from the input terminal 21 is input as a "1" signal via the NOT circuit 27, and the OR circuit 23
Since the "1" signal is input from the terminal 5', the OR circuit 24 outputs a "1" signal and supplies it to the terminal 6'. The OR circuit 24 receives the "0" output signal from the switch 3 as a "1" signal via the terminal 3' and the NOT circuit 25, and since the "0" signal from the switch 2 is input, the OR circuit 24 outputs a "1" signal and supplies it to the terminal 5'.
The signal is applied to the bases of the transistors 31 and 34 to make the transistors 31 and 34 non-conductive. On the other hand, this signal is applied to the bases of the transistors 32 and 33 as a "0" signal via the NOT circuit 30.
Therefore, the signal applied to the terminal 6' is a "1" signal, and this signal is applied to the emitter side of the transistor 32, so that the signal flows from the transistor 32 to the motor 5 (arrow R
The current flows from the input terminal 31 to the transistor 33 and then to ground, energizing the motor 5 and causing it to start rotating in the reverse direction. The torque of the motor 5 starting to rotate in the reverse direction is transmitted to the transmission gear 13 gear portion 12 in FIG. 2,
The barrier 11 starts to move in the closing direction.

Next, while the barrier 11 is moving to the closed side,
The switch 4 is opened by the movement of the barrier 11, and the pull-up resistor 19 outputs a signal of "1", thereby indicating a transition from the state D to the state D'. The change in the output signal of switch 4 is
Affects only the AND circuit 20, but
The output signal from another switch is being input.
The states of the AND circuits 21 and 22 remain in the D state, and the OR circuit 23 inputting the "1" signal from the AND circuit 21 receives the "1" signal regardless of the output signal of the AND circuit 20. Output the signal and
does not change from the state of Since the other elements of the logic circuit 6 are not affected by the output signal of the switch 4, the signals output from the AND circuit 29 and the OR circuit 24 are in the same state as in state D. Therefore, the signals applied to terminals 5' and 6' are "1" signals, and D
The barrier 11 continues its closing operation in the same manner as in the state shown in FIG.

Next, in state D', the operation of closing the barrier 11 continues, and when the barrier 11 is completely closed as shown in FIG. Switch 1 is closed and grounded, and a signal of "0" is output from switch 1. Also, the open/close status of switches 2 to 4 is
Since there is no change from the state of D', signals of "0", "0", and "1" are output from these, respectively. Since each output signal of these switches 1 to 4 is exactly the same as state A, the state shifts from state D' to state A when the closing operation of barrier 11 is completed. As mentioned above, in state A, the motor 1 is not energized, so the barrier 11 stops closing.

Next, the operations in each state of E, F, G, and G' when the focal length switching operation of the optical system is in progress or not completed will be explained. First, when the opening and closing of the barrier 11 is completed, the camera operator changes from the standard photographing state shown in FIGS. 6a and 7a to the state shown in FIGS. 6b and 7c. The objective is to switch the focal length of the optical system to the telephoto shooting state, or vice versa, in exactly the same manner as described above. However, due to this switching operation, the switching of the focal length of the optical system is not completed as shown in Figures 6a and 7a, or 6b and 7c, and is not completed. Or, in the case that the switching is in progress, the operation of switching the focal length of the optical system whose movement of the sub lens system 49 in FIG. state. In this case, the extender 48, which is grounded, and the stoppers 56a, 56b are not in electrical contact with each other, so the switch 2 shown in FIG. The pull-up resistor 17 causes the switch 2 to output a signal of "1".

In state E, the barrier 11 is closed and the focal length of the optical system is being switched, and the switching operation is in progress or has not been completed, so the switch 1 is closed and grounded, and from now on ” signal is output, and switch 2 outputs a signal “1”. Since the barrier opening/closing knob 7 is set to the closed side, the switch 3 is closed and grounded, and a signal of "0" is output from this, and the switch 4 is opened, so the pull-up resistor 19 prevents the switch 3 from being connected. A signal of "1" is output. The signals of ``0'', ``1'', ``0'', and ``1'' of these switches 1, 2, 3, and 4 are respectively applied to terminals 1', 2', 3', and 4' of the logic circuit. Input to logic circuit 6. Since the AND circuit 20 receives signals of "0" and "1" from the switches 3 and 4, respectively, a signal of "0" is output from now on. The AND circuit 21 receives the "0" signal from switch 1 and the "0" signal from switch 3.
Since it is input as a "1" signal via the NOT circuit 25, a "0" signal is output.
The AND circuit 22 receives a "0" signal from switch 1 and a "1" signal from switch 2, and outputs a "0" signal. OR circuit 23 is AND circuit 2
It inputs three signals of "1" of 0, 21, and 22 and outputs a signal of "0". The AND circuit 28 inputs the "0" signal from the switch 1 as a "1" signal via the NOT circuit 26, and also inputs the "1" signal from the switch 2, so from now on the "1" signal will be input. signal is output. AND circuit 29
connects the “1” signal of the AND circuit 28 to the NOT circuit 27
input as a “0” signal via, and also OR
Since a "0" signal is input from the circuit 23, a "0" signal is output and applied to the terminal 6'.
The OR circuit 24 receives the “0” signal from the switch 3.
Since the signal is input as a "1" signal through the NOT circuit 25, and the signal "1" is also input from the switch 2, a signal of "1" is outputted and applied to the terminal 5'. The signals "1" and "0" outputted to the terminals 5' and 6' are exactly the same as the state of A, as can be seen from FIGS. 3 and 5. Therefore, since the signal input to the motor drive circuit 8 in the state E is the same as in the state A, the motor 5 can be rotated in the opposite direction in the state E as well as in the state A, but the motor 5 is in a de-energized state and the motor 5 is stopped, so the barrier 11
won't open.

As can be seen from FIG. 3, when the switching operation of the focal length of the optical system is completed from state E, switch 2 is closed and grounded, so a signal of "0" is output from switch 2. Since the output states of switches 1 to 4 are the same as the state A, the state A is set.

Next, if the switch opening/closing knob 7 is set to the open side while in state E, the switch 3 will be opened in conjunction with this, and a signal of "1" will be output from the pull-up resistor 18, which will cause the logic circuit to open. 6 terminal 1'. switch 1,
The respective output states of 2 and 4 are the same as the state of E, and the signals "0", "1", and "1" are outputted from these, respectively, and the signals are outputted to the respective terminals 1', 2', and 4' of the logic circuit 6. is given to. The AND circuit 28 inputs the "0" signal of switch 1 as a "1" signal via the NOT circuit 26, and also inputs the "1" signal from switch 2, so it receives the "1" signal. Output. AND circuit 29 is “1” from AND circuit 28
Since the signal is input as a "0" signal through the NOT circuit 27, a "0" signal is outputted and applied to the terminal 6' regardless of the state of the other input signals. The OR circuit 24 inputs the "1" signal from the switch 3 as a "0" signal via the NOT circuit 25, and also inputs the "1" signal from the switch 2, so it receives a "1" signal. is output and applied to terminal 5'. The signals "1" and "0" outputted to the terminals 5' and 6' are exactly the same as the states A and E, as can be seen from FIGS. 3 and 5. Therefore, since the signal input to the motor drive circuit 8 in the F state is the same as in the A and E states, the F state is also the same as the A and E states.
can be rotated in the opposite direction if energized, but since the motor 5 is de-energized and stopped, the barrier 11 does not open and remains closed.

As can be seen from Figure 3, once the focal length switching operation of the optical system is completed from the F state, the switch 2
is closed and grounded, so a signal of "0" is output from this switch 2, and the output status of each switch 1 to 4 is the same as the status of B, so at this time, as mentioned above, the barrier 11 starts the opening operation. As described above, the state B transitions to the state B', and then to the state C, where the barrier 11 is completely opened and the movement of the barrier 11 is stopped.

Next, with the barrier 11 completely open, perform the switching operation of the focal length of the optical system as described above, and when the switching operation is in the middle of the switching operation or in the state of G where the switching operation is not completed, the same as above. The switch 2 is opened and the pull-up resistor 17 outputs a signal of "1". Since the barrier 11 is open, the switch 1 is open and outputs a "1" signal through the pull-up resistor 16, and the switch 4 is closed and grounded, so it outputs a "0" signal. . The switch 3 remains as it was when the barrier 11 was opened, and the barrier opening/closing knob 7 is set to the open side, so the switch 3 is opened in conjunction with this, and the pull-up resistor 18 generates a "1" signal. is outputting. The signals "1", "1", "1", and "0" of these switches 1 to 4 are applied to terminals 1', 2', 3', and 4' of the logic circuit 6, respectively. AND circuit 28 is "1" from switch 1
Since the signal is input as a "0" signal through the NOT circuit 26, a "0" signal is output regardless of other input signals. AND circuit 22
inputs the signal from switch 1 and the signal "1" from switch 2, respectively, and therefore outputs the signal "1". OR circuit 23 is AND circuit 22
Since we are inputting the "1" signal of
A signal of "1" is output regardless of the input signals from the circuits 20 and 21. AND circuit 29
The "0" output signal from the AND circuit 28 is input as a "1" signal via the NOT circuit 27, and the "1" output signal is input from the OR circuit, so the "1" signal is input as a "1" signal. It is output and applied to terminal 6'. The OR circuit 24 inputs the "1" output signal from the switch 3 as a "0" signal via the NOT circuit 25, and also inputs the "1" output signal from the switch 2, so it is "1". '' signal is output and applied to terminal 5'. The signals of "1" and "1" at these terminals 5' and 6' are the same as the states of D and D' in FIG. 5, respectively. That is, in the states D and D', terminals 5' and 5' are connected to the motor drive circuit 8 in the same manner as described above.
When each "1" signal is input from 6', current flows in the order of transistor 32 → motor 5 (in the direction of arrow R) → transistor 33 → ground, and the motor 5 starts rotating in the opposite direction, and this torque is transmitted to the transmission gear 13 and gear section 12 in FIG.
1 starts the closing operation.

While the barrier 11 is closing, the switch 4 which was closed due to the barrier 11 being completely opened
Since the switch 4 is opened, a signal of "1" is output from the switch 4 by the pull-up resistor 19.
The state becomes G′. This change in the output signal of switch 4 affects AND circuit 20. but,
Since the output states of the other switches 1 to 3 have not changed from the G state, the output signal of the AND circuit 22 inputting the output signals of switches 1 and 2 is the same as the G state, and is a "1" signal. It is. Therefore, since the OR circuit 23 receives the "1" signal from the AND circuit 22, it outputs a "1" signal regardless of the input signals from the other AND circuits 20 and 21.
Therefore, the AND circuit 29 receives the signals "1" and "1" as in the state of G, and outputs the signal "1", which is applied to the terminal 6'. In addition, the OR circuit 24
The output state is the same as the state of G above, and a signal of "1" is outputted and applied to the terminal 5'. This terminal 5',
The signals of "1" applied to 6' are the same as the state of G, and the motor drive circuit 8 to which these signals are input rotates the motor 5 in the opposite direction and rotates the barrier 11.
Close further.

When the barrier 11 is completely closed, the switch 1 is closed and grounded by the contact piece being pushed by the barrier 11, and the output signal from now on will be a "0" signal, so the state of the other switches will be G. Since there is no change from the state ', if we change the "1" of the switch 1 in the state G' to "0" in Fig. 3, it will be the same as the state F, and if we write the above in the state F, the motor 5 will change. It does not rotate and the barrier 11 is in a closed state.

Although not shown in FIGS. 3 and 5, if the barrier opening/closing knob 7 is set to the closed side while the barrier 11 is open and the focal length switching operation of the optical system is in progress or incomplete. , the switch 3 is closed and grounded and outputs a "0" signal. This state is exactly the state of G in Fig. 3 when switch 3 is pressed.
It is the same as replacing "1" with "0". AND circuit 22 is "1" from switches 1 and 2
Since each signal is input, a signal of "1" is output. Since the OR circuit 23 receives this "1" signal, it outputs a "1" signal.
NOT circuit 27 is NOT circuit 26, AND circuit 28
The "1" signals of switches 1 and 2 are inputted through the switches 1 and 2, and since this input state is the same as the state of G, a "1" signal is output. The AND circuit 29 is
“1” signal from NOT circuit 27 and OR circuit 23
Since the ``1'' signal from ``1'' is inputted, the ``1'' signal is given to the output terminal 6'. OR circuit 24
Since inputting the "1" signal from the switch 2, the "1" signal is output and applied to the terminal 5'.
Therefore, the barrier 11 moves to the closing operation as in the G state. When the barrier 11 is in the closing operation, the switch 4 is closed from the above operating state, and the pull-up resistor 19 outputs a signal of "1", and the AND
Although the circuit 20 is affected, the OR circuit 23 is not affected by the change in the output state of the AND circuit 20, so the above state continues and the barrier 11 continues to close.
When the barrier 11 is completely closed, the switch 1 is closed and grounded, and a signal of "0" is output from this, and the output states of the switches 1 to 4 become the same as the state of E, so the barrier 11 stops.

Note that when the barrier 11 is open, the focal length of the optical system is switched, and when the barrier 11 is in the state of G',
If the switching operation is completed while the switch is closing, this state will be the state shown in Figure 3, with "1" of switch 2 replaced with "0", and this state will be the state shown in B'. The dovetail barrier 11 is moved in the direction of opening, and the barrier 11 is completely opened.

The present invention is not limited to this, and the switch 2 may be opened or closed according to the switching state of the focal length of the optical system, and is not necessarily limited to the switch 2 shown in FIGS. 6 and 7. It's not something you can do. For example, a switch can be constructed by attaching an electrically conductive brush to an extender and sliding it over a printed circuit board on which wiring is printed. In addition, a lens system with two contact pieces at both ends where the sub lens system moves or at both ends where the extender moves.
The switch 2 may be constructed by arranging two switches, respectively, and opening and closing the switches by pressing one side of each of the switches.

Furthermore, a sliding barrier may be provided instead of a rotating barrier. It is well known that this barrier opens and closes in conjunction with a motor, so a description thereof will be omitted.

Furthermore, although the present embodiment has been described with two steps of switching the focal length of the optical system, the present invention can be similarly easily applied to a camera with three or more steps of switching the focal length.

Furthermore, only when the barrier is completely opened, a NOT terminal is connected to the output side of switch 4 in FIG. You can connect the input side of the circuit and connect the output side to the power input side of the main circuit, and also connect the output side of the NOT circuit to the gate side of the FET that serves as the switch for turning on the power of the main circuit. Just do it. By doing this, the switch 4 is closed and grounded only when the barrier is completely opened.
A signal of "0" from the terminal turns into a signal of "1" in the NOT circuit, and power is turned on to the main circuit 71. That is, the main circuit 71 is powered on and the shutter release operation is performed only in state C when the focal length switching operation of the optical system in FIG. 3 has been completed and the barrier is completely open. The camera is now ready to take pictures. Switch 4 is opened immediately when the focal length switching operation of the optical system of other cameras is in progress or has not been completed, but since it is in the open state, the pull-up resistor 19 in Fig. 1 causes a signal of "1". is given to the NOT circuit from switch 4,
Due to the output signal of "0" from the NOT circuit 70, the power to the main circuit 71 is not turned on and photography becomes impossible.

Furthermore, although the present invention has been explained using an example in which the barrier is opened and closed by a motor, this may be done not only by a motor, but also by using an electromagnet or a mechanical structure instead of the motor. Needless to say.

As explained above, the present invention has a mechanism in which the barrier does not open or closes when the variable focal length switching operation is in progress or when the switching operation is not completed. It is possible to easily determine whether the barrier is in a state where it can be photographed by closing it, by looking at the open/closed state of the barrier, and it is very effective because it prevents failures in photographing and loss of valuable shutter opportunities.

[Brief explanation of the drawing]

Fig. 1 is a basic block diagram used in the variable focus camera with a barrier according to the present invention, and Fig. 2 is a block diagram showing the principle of the mechanism of the variable focus camera with a barrier according to the present invention using the circuit shown in Fig. 1. An explanatory diagram, FIG. 3 is a simplified diagram for explaining in detail the principle circuit diagram shown in FIG. 1 for driving the barrier of the variable focus camera with barrier in FIG. 2, and FIG. A circuit diagram of a detailed example of the principle circuit diagram excluding switches,
Fig. 5 is a simplified diagram showing the output state of each circuit part in Figs. 1 and 4, and Fig. 6 shows the state when the switching operation of the optical system of the variable focus camera with barrier according to the present invention is completed. Cross-sectional view of variable focus camera with barrier,
FIG. 7 is a simplified diagram showing each switching state of the optical system of the variable focus camera with a barrier according to the present invention. 1 to 4: Switch, 5: Motor, 6: Logic circuit, 7: Barrier opening/closing knob, 8: Motor drive circuit, 10: Main lens system, 11: Barrier, 12: Gear part, 13: Transmission gear, 14, 15 :Axis, 1'~
4': (input side) terminal, 5', 6': (output side) terminal, A, B, B', C, D, D', E, F, G,
G': Each state of the mechanism of the variable focus camera with barrier according to the present invention.

Claims (1)

[Scope of utility model registration request] A photographing optical system having a variable focal length, a protective cover that can be opened and closed to protect the photographing optical system, an operation means for opening the protective cover, and determining that the photographing optical system is in the process of changing its focal length. a determining means for determining, and a determining means for prohibiting release of the protective cover or placing the protective cover in a released state in response to the determining means, when the photographing optical system is in the process of changing the focal length, giving priority to the action of the operating means. A camera comprising a control means for closing the camera.