JP2681916B2 - Camera auxiliary optics insertion / removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention is a device for inserting and retracting an auxiliary optical system such as a soft focus filter built in a so-called multifocal camera capable of switching focal lengths into an optical path. Regarding B. Prior Art The applicant of the present invention has previously proposed an insertion / removal device for a soft focus filter of this type in the specification of Japanese Patent Application No. 61-106222. With the insertion / removal device proposed there, when the lens barrel is set to the telephoto shooting position and the soft focus filter is inserted into the optical path of the shooting optical system, the soft focus filter is constrained in the inserted state and the soft focus filter is inserted. If the lens barrel is set to the wide-angle shooting position while keeping the state, the soft focus filter is automatically retracted from the optical path by the spring force. Also, the soft focus filter can be manually retracted from the optical path during telephoto shooting. Further, the soft focus filter can be manually inserted and constrained in the optical path against the spring force acting on the soft focus filter during wide-angle shooting. C. Problems to be solved by the invention However, when the telephoto shooting position is set, if the soft focus filter is inserted into the optical path of the shooting optical system, the retract operation is manually performed or the wide-angle shooting position is not set. As long as the soft focus filter is still inserted, there is a risk of shooting with the soft focus filter even though the subject should be shot without the soft focus filter. This kind of problem may similarly occur in other auxiliary optical systems such as a close-up lens that changes the photographing effect by being inserted in the optical path. An object of the present invention is to provide an auxiliary optical system insertion / removal device for a camera that solves the above-mentioned problems by retracting the auxiliary optical system such as a soft focus filter from the optical path of the imaging optical system after each photographing. . D. Means for Solving Problems When the present invention is described with reference to FIG. 1 and FIG. 4 showing an embodiment, the invention of claim 1 is movable to a plurality of photographing positions in the optical axis direction. It is applied to an auxiliary optical system insertion / removal device of a camera for inserting / removing the auxiliary optical system 19 in the optical path of the taking optical system 15. Then, manually operate the auxiliary optical system 19 to capture the optical system.
Inserting members 20 and 21 to be inserted into the optical path of 15 and the photographing optical system 15
And retracting mechanisms 22 and 23 for retracting the auxiliary optical system 19 in the optical path of the photographing optical system 15 when the photographing optical system 15 reaches a predetermined position different from the photographing position in association with the movement of the photographing optical system 15 in the optical axis direction. Solves the above technical problem. The invention according to claim 2 is applied to the auxiliary optical system insertion / removal device for a camera according to claim 1, and the photographing optical system 15 is used after each photographing.
Drive control means 102, 3 for retracting the auxiliary optical system 19 in the optical path of the photographing optical system 15 by moving the lens to a predetermined position. The invention of claim 3 is applied to an auxiliary optical system inserting / removing device of a camera for inserting / removing the auxiliary optical system 19 into / from the optical path of the photographing optical system 15 which is movable to a plurality of photographing positions in the optical axis direction. Then, the auxiliary optical system 19 can be manually inserted into and removed from the optical path of the photographing optical system 15, and an insertion / removal member 21, a mode selection means SW3 capable of selecting the first mode and the second mode, and the first When the mode is selected, the auxiliary optical system 19
On the other hand, when the second mode is selected, the control means 31 for controlling the insertion / removal member 21 so as not to retract the auxiliary optical system 19 even after the photographing is completed. Solves the above technical problem. The invention according to claim 4 is applied to the auxiliary optical system insertion / removal device for a camera according to claim 3, and the first or second mode selected by the mode selection means is moved in the optical axis direction of the photographing optical system 15. It is configured to be released by. E. Action In the invention of claim 1, the auxiliary optical system inserted into the optical path of the photographing optical system 15 by manual operation by the insertion members 20 and 21.
The retracting mechanism 19 is retracted from the optical path of the photographing optical system 15 by the retracting mechanisms 22 and 23 when the photographing optical system 15 moves in the optical axis direction and reaches a predetermined position different from the photographing position. According to the second aspect of the present invention, the photographing optical system 15 is moved to a predetermined position after each photographing, and the retracting mechanisms 22 and 23 retract the auxiliary optical system 19 in the optical path of the photographing optical system 15. According to the third aspect of the present invention, when the first mode is selected by the mode selecting means SW3, the auxiliary optical system 19 is automatically retracted when the photographing is completed, and when the second mode is selected, the auxiliary optical system 19 is selected. It is possible to continuously shoot with the system 19 inserted in the optical path of the shooting optical system 15. In the invention of claim 4, the first or second mode selected by the mode selecting means SW3 is the photographing optical system.
It is released by moving 15 along the optical axis. F. Embodiment An embodiment in which the present invention is applied to insertion / removal of a soft focus filter will be described with reference to FIGS. FIG. 1 is a perspective view of a main part of a soft focus filter insertion / removal device, showing a case where a lens barrel is in a telephoto shooting position, and FIG. 2 is a sectional view taken along line II-II of FIG. The case where the cylinder is in the wide-angle shooting position is shown. In both figures, the guide tube 2 is rotatably supported by the camera body 1. A helicoid 2a is engraved on the inner surface of the guide cylinder 2 almost to the tip, and a gear 2b is formed on the outer peripheral surface. A drive gear 4 rotationally driven by a motor 3 provided in the camera body is meshed with the gear 2b. Reference numeral 10 denotes a lens barrel that moves forward and backward with respect to the guide barrel 2 in the optical axis direction, and has a lens barrel outer barrel 11 having an outer peripheral surface engraved with a helicoid 11a that meshes with the helicoid 2a. This lens barrel 1
A holding plate 12 is screwed to the inner middle portion of the
The support member 13 is screwed to the front side of the camera of the
Further, a main photographing optical system 15 having a lens group L1 supported by a holding cylinder 14 is provided so as to be movable in the optical axis direction. Further, a sub-photographing optical system 17 for holding the lens group L2 by a holding member 16 is provided on the rear side of the camera of the holding plate 12 so as to be inserted into and removed from the optical path of the taking optical system. This sub-shooting lens optical system 17 is inserted into the optical path when the lens barrel 10 is set to the telephoto shooting position to set the camera to the long focus, and when the lens barrel 10 is set to the wide-angle shooting position, the optical path is set. Evacuated from and set the camera to short focus. The insertion / removal mechanism is well known and will not be described. Further, a shutter device 18 is provided on the rear side of the photographing optical system 15, and a soft focus filter 19 is provided between the shutter device 18 and the support plate 12. The soft focus filter 19 is supported by a holding portion 20, and the holding portion 20 is a support plate.
The shaft 12a is rotatably supported by a shaft 12a projecting from the optical axis 12, and the shaft 12a is used as a rotation shaft. The insertion position is inserted into the optical path as shown by the chain double-dashed line in FIG. It is rotatable with respect to the retracted position. An upper portion of the soft focus filter holding portion 20 is bent toward the front of the camera to form an arm 20a, and the arm 20a is fitted in a groove portion 21a of the filter inserting / removing operation ring 21 extending rearward of the camera. In FIG. 1, the length of the arm 20a in the optical axis direction is exaggerated. Operating ring 21
As shown in FIG. 2, the lens barrel outer cylinder 11 is rotatably and coaxially fitted to the front inner peripheral surface of the lens barrel outer cylinder 11.
It projects from the outer peripheral surface of 1. When the operation knob 21b is operated counterclockwise (FIG. 1), the soft focus filter 19 is inserted into the optical path, and when it is operated clockwise, the soft focus filter 19 is retracted from the optical path. A release ring 22 is rotatably and coaxially provided inside the operation ring 21, and a protrusion 22a thereof is a protrusion 21c of the operation ring 21.
And engageable with. The release ring 22 has an arm 22b extending from the circumferential portion to the rear of the camera, and a cam follower 22c is formed at the tip of the arm 22b. This cam follower 2
2c can be engaged with the cam surface 23a of the cam plate 23 extending from the camera body 1 to the front of the camera by the movement of the lens barrel 10 in the optical axis direction. FIG. 3 shows a release ring 22 having a cam follower 22c.
2 shows the positional relationship between the arm 22b and the cam plate 23, and the state in the drawing shows the case where the lens barrel is in the telephoto shooting position. In this case, the cam follower 22c and the cam plate 23 are separated from each other, and the release ring 22 is stopped at the position biased by the spring 24. When the lens barrel 10 is retracted and the cam follower 22c reaches the release position, the cam follower 22c moves to the cam surface 23a.
And the release ring 22 rotates clockwise against the spring force of the spring 24. As a result, the release ring projection 22a pushes the operation ring projection 21a clockwise to rotate it, so that the soft focus filter 19 rotates clockwise. A toggle spring 25 is stretched over the soft focus filter 19 as shown in FIG. It is forcibly moved to the retracted position. Even when the retracted position is rotated to the insertion position, if the neutral position is exceeded, the toggle spring 25 forces the movement to the insertion position. When the cam follower 22c passes the release position, the spring force of the spring 24 causes the release ring 22 to rotate counterclockwise on the cam surface 23a. As a result, the projection 22a of the release ring is separated from the projection 21c of the operation ring, and a gap is formed between the two so that the operation ring 21 is manually rotated counterclockwise to insert the soft focus filter 19 into the optical path. . Lens barrel 10
This state is maintained even when is set to the wide-angle shooting position. When the lens barrel 10 is retracted to the reset position when the soft focus filter 19 is inserted in the optical path at the wide-angle shooting position, the cam follower 22c rides on the cam surface 23b and reaches the reset / release position. The soft focus filter 19 is retracted from the optical path. As shown in FIG. 2, a terminal support plate 61 is fixed to a support member 6 fixedly provided on the camera body side in correspondence with the outer peripheral wall of the tip end portion of the guide tube 2, and the terminal support plate 61 is provided with terminals. 62 to 64 are supported, and these terminals 62 to 64 are provided on the peripheral wall of the tip of the guide tube 2.
The circuit board 7 which is in sliding contact with is fixed. An encoder 60 that detects the position of the lens barrel is configured by each of these components. The circuit board 7 is composed of a flexible printed circuit board, and from each terminal 62 to 64 contacting the flexible printed circuit board according to the position of the lens barrel 10, a signal Sr indicating a reset position, a signal Sw indicating a wide-angle shooting position and a telephoto shooting position. The signal St indicating is output. FIG. 4 shows the control system of this embodiment. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted. The control circuit 31 is composed of a well-known microcomputer having a ROM, a RAM, a CPU and the like. SW1 is a changeover switch for setting the photographing optical system 15, that is, the lens barrel 10 to the reset position (R), the wide-angle photographing position (W), and the telephoto photographing position (T),
SW2 is a detection switch that interlocks with the soft focus filter 19 and closes when it is inserted into the optical path to output a filter signal. SW3 is a continuous mode (C) in which the soft focus filter 19 is continuously used. This is a mode changeover switch for setting a single mode (S) for retracting from the optical path and a mode (N) for not using the soft focus filter 19, and the signals of the switches SW1 to SW3 are input to the control circuit 31. In addition, the signals of the terminals 62 to 64 forming the encoder 60 described above are also input. Control circuit 31
Executes a program to be described later based on these input signals to supply a motor drive command signal to the motor drive circuit 32. According to the command signal, a drive signal is supplied from the motor drive circuit 32 to the motor 3 to drive the motor 3. In FIG. 4, 40 is a gear, and 41 and 42 are batteries. This embodiment will be further described with reference to the flow chart shown in FIG. In step S1, when the operation control of the shutter device 18 is executed and the exposure is completed, the process proceeds to step S2. If the detection switch SW2 is open (the filter signal is not output), the soft focus filter 19 is retracted from the optical path, and the process proceeds to step S3 to execute the film winding control to end the photographing. On the other hand, when the soft focus filter 19 is inserted in the optical path, the detection switch SW2 is closed (a filter signal is output), and an affirmative decision is made in step S2 and step S4
Proceed to. In step S4, it is determined whether the soft focus filter 19 is continuously used, based on the signal input from the mode changeover switch SW3. If the mode switch SW3 has been switched to the C terminal, an affirmative decision is made in step S4, the film is wound up in step S3, and shooting ends. If the mode selector switch SW3 is switched to the S terminal or the N terminal, the process proceeds to step S5. In step S5, it is determined by the signal from the encoder 60 whether or not the lens barrel 10 is at the telephoto shooting position, and if a negative determination is made,
That is, when in the wide-angle shooting position, in step S6,
A motor drive command signal is output so as to retract the lens barrel 10. The command signal causes the motor drive circuit 32 to rotate the motor 3. Drive gear by rotation of motor 3
The guide tube 2 rotates via 40, 4 and the gear 2b. As a result, the lens barrel 10 is retracted along the optical axis via the helicoids 2a and 11a. In step S7, it is determined whether or not the lens barrel 10 has reached the reset position based on a signal from the encoder 60. That is, when the lens barrel 10 in the wide-angle shooting position is retracted to the reset position, the cam follower 22c of the release ring 22 is moved to the cam plate 23 as described with reference to FIG.
The ride-on release ring 22 pivots clockwise on the cam surface 23b to retract the soft focus filter 19 from the optical path. Next, when an affirmative decision is made in step S7, the operation proceeds to step S8, in which a motor drive command signal is output to the motor drive circuit 32 to drive the motor 3 to extend the lens barrel 10. If it is determined in step S9 that the lens barrel 10 has reached the wide-angle shooting position, the motor 3 is stopped in step S10. On the other hand, if the lens barrel 10 is at the telephoto position, an affirmative decision is made in step S5, the operation proceeds to step S11, and the lens barrel 10 is retracted in the same manner as in step S6. Release ring
When the cam follower 22c of 22 rides on the cam surface 23a and the soft focus filter 19 is retracted from the optical path, the filter signal from the detection switch SW2 disappears.
Is affirmatively determined and the process proceeds to steps S13 and S14. Step S1
3, The lens barrel 10 is reset to the telephoto shooting position by S14. When retracting the soft focus filter by retracting the lens barrel at the telephoto position, it is determined whether the soft focus filter is retracted because the filter signal from the switch SW2 interlocking with the soft focus filter disappears. However, a signal corresponding to the disappearance of the filter signal may be output from the encoder at the lens barrel position corresponding to the retracted position to determine whether the soft focus filter is retracted. When set to the telephoto position, the retracted soft focus filter is determined by detecting that the lens barrel has been retracted to the reset position or wide-angle shooting position without using the filter signal from the switch SW2 or encoder. You may. Furthermore, in the above, the soft focus filter was retracted in conjunction with the retracting of the lens barrel, but the lens barrel is retracted from the wide-angle shooting position and retracted by the cam follower 22c riding on the cam surface 23c shown in FIG. May be. In the configuration of the above embodiment, the soft focus filter 19 is the auxiliary optical system, the holding portion 20 and the operation ring 21 are the insertion members, the release ring 22 and the cam plate 23 are the retracting mechanisms, and the drive control device 102 and the motor 3 are Each of them constitutes drive control means. In this way, when the soft focus filter 19 is used, the soft focus filter 19 is
Is retracted from the optical path, so it is possible to prevent inadvertent shooting with the soft focus filter attached. The mode switch SW3 may be omitted, and in this case, step S4 in FIG. 5 is omitted. Further, although the present invention has been described above with respect to the soft focus filter, the present invention is not limited to this, and other auxiliary devices such as a polarization filter and a close-up lens which are inserted in the optical path of the photographing for optically changing the photographing effect. It can be applied to an optical system. G. Effect of the Invention According to the present invention, there is provided a retracting mechanism that retracts the auxiliary optical system manually inserted into the optical path of the photographing optical system by the insertion member in conjunction with the movement of the photographing optical system in the optical axis direction. Since it is equipped, the auxiliary optical system can be inserted into the optical path of the shooting optical system at any time according to the judgment and preference of the shooter, and the shooter moves the shooting optical system in the optical axis direction to shoot another scene. If an attempt is made, the auxiliary optical system automatically retracts.
As a result, after the photographer finishes shooting with the auxiliary optical system, he forgets to retract the auxiliary optical system and shoots the next scene, which may result in unintended shooting results. In addition, it is possible to prevent the cost and installation space by adding a dedicated actuator to these mechanisms or by not requiring a transmission mechanism from the winding motor to the lens barrel as in the case of using the driving force of the film winding motor. Can save In addition, since the auxiliary optical system in the optical path of the shooting optical system is retracted by the retracting mechanism that moves the shooting optical system to a predetermined position after each shooting, the photographer moves the shooting optical system in the optical axis direction. The auxiliary optical system is automatically retracted without any operation, and it is possible to prevent an erroneous operation of accidentally taking a picture with the auxiliary optical system inserted when shooting a subject for which the use of the auxiliary optical system is unnecessary. In addition, a mode selection unit is provided to enable selection of a mode in which the auxiliary optical system is automatically retracted at the end of shooting, or a mode in which continuous shooting is possible with the auxiliary optical system inserted in the optical path of the shooting optical system. In addition to the above-mentioned effects, operability is improved when it is desired to continuously shoot while inserting the auxiliary optical system in the optical path of the shooting optical system. Further, when the photographer performs a moving operation of the photographing optical system in the optical axis direction after any one of the above modes is set by the mode selecting means, these modes are automatically canceled. It is possible to prevent the shooting result from becoming unintended by forgetting to do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 show an embodiment, FIG. 1 is a schematic perspective view showing the entire structure, FIG. 2 is a sectional view taken along the line II-II, and FIG. FIG. 4 is a block diagram of the control system showing the positional relationship between the cam follower and the cam surface, and FIG. 5 is a flowchart showing the processing procedure. 1: camera body, 2: guide barrel 2a: helicoid, 2b: gear 3: motor, 10: lens barrel 11: lens barrel outer barrel, 11a: helicoid 12a: turning axis, 15: main shooting optical system 17: sub Shooting optical system, 18: Shutter device 19: Soft focus filter 20: Holding part, 21: Operation ring 21a: Groove, 21b: Knob 21c: Protrusion, 22: Release ring 22a: Protrusion, 22b: Arm 22c: Cam follower, 23: Cam plates 23a, 23b: cam surfaces, 31: control device 32: motor drive circuit 60: encoder, 101: insertion / removal mechanism 102: drive control device

Continuation of front page    (56) References JP-A-63-138320 (JP, A)                 JP 62-262839 (JP, A)                 JP-A-63-34526 (JP, A)                 JP 59-44032 (JP, A)                 JP 57-146232 (JP, A)

Claims (1)

(57) [Claims] In an auxiliary optical system insertion / removal device for a camera, which is used in a camera having a photographing optical system that can move to a plurality of photographing positions in the optical axis direction, and which inserts / removes the auxiliary optical system in the optical path of the photographing optical system, An insertion member that inserts the auxiliary optical system into the optical path of the photographing optical system, and operates in conjunction with movement of the photographing optical system in the optical axis direction, and the photographing optical system comes to a predetermined position different from the photographing position. An auxiliary optical system insertion / removal device for a camera, comprising: a retracting mechanism for retracting the auxiliary optical system that is in the optical path of the photographing optical system. 2. The drive control means for moving the photographing optical system to the predetermined position and retracting the auxiliary optical system in the optical path of the photographing optical system each time photographing is completed is provided. Auxiliary optical system insertion / removal device for the described camera. 3. In an auxiliary optical system insertion / removal device for a camera, which is used in a camera having a photographing optical system that can move to a plurality of photographing positions in the optical axis direction, and which inserts / removes the auxiliary optical system in the optical path of the photographing optical system, An insertion / removal member capable of inserting / removing the auxiliary optical system into / from the optical path of the photographing optical system, a mode selection unit capable of selecting a first mode and a second mode, and the first mode are selected. In this case, the auxiliary optical system is automatically retracted at the end of shooting, while the auxiliary optical system is not retracted even when the shooting is completed when the second mode is selected. An auxiliary optical system insertion / removal device for a camera, comprising: a control unit that controls the insertion / removal member. 4. The auxiliary optical system insertion / removal device for a camera according to claim 3, wherein the first and second modes are released by movement of the photographing optical system in the optical axis direction.