JP2897901B2 - Camera optical member switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for switching an optical member of a camera, and more particularly, to an optical member of a camera such as a tele lens (T lens) and a wide lens (W lens) which is moved in and out of an optical axis of a photographing optical system. The present invention relates to a switching device for an optical member of a camera.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a conventional optical member switching device of a camera, showing a telephoto state and a wide state, respectively. As shown in these drawings, this switching device is composed of lens moving frames 3 and 4, which respectively hold a T lens 1 and a W lens 2, torsion springs 5, 6, a slide member 7, a motor pinion 8, and the like. I have.

The respective lens moving frames 3 and 4 are rotatably disposed, and are biased by torsion springs 5 and 6 in the direction in which the T lens 1 and the W lens 2 move on the optical axis I of the photographing optical system. ing. The slide member 7 is formed with a rack 7A that meshes with the motor pinion 8, and the slide member 7 moves up and down in the figure by rotation of the motor pinion 8. Further, pins 7B and 7C that can contact the lever portions 2A and 3A at one end of the lens moving frames 2 and 3 are implanted in the slide member 7, and the slide member 7 is provided with these pins 7B and 7B.
Driving force can be transmitted to the lens moving frames 2 and 3 via 7C.

In the switching device having the above structure, when the slide member 7 moves downward in the drawing, a driving force is applied to the lens moving frame 4 from the slide member 7 via the pin 7C and the lever portion 4A as shown in FIG. The transmitted lens frame 4 is rotated clockwise (CW direction) against the urging force of the torsion spring 6. On the other hand, the other lens moving frame 3 is rotated to a position where it comes into contact with the positioning pin 9A by the urging force of the torsion spring 5, whereby the T lens 1 is positioned on the optical axis I of the photographing optical system.

Similarly, when the slide member 7 moves upward in the drawing, a driving force is transmitted from the slide member 7 to the lens moving frame 3 via the pin 7B and the lever portion 3A as shown in FIG. The lens moving frame 3 is rotated counterclockwise (CCW direction) against the urging force of the torsion spring 5. On the other hand, the lens moving frame 4 is rotated by the biasing force of the torsion spring 6 to a position where it contacts the positioning pin 9B,
Thereby, the W lens 2 is positioned on the optical axis I of the photographing optical system.

[0006]

However, in the case of the above-mentioned conventional lens switching device, since the driving force of the slide member 7 is directly transmitted from the motor via the gear train, the normal operation range due to system runaway or the like. If the operation is performed beyond the range, there is a problem that the mechanism is destroyed. Therefore, it is necessary to provide a slip mechanism for slipping at the time of overload in the power transmission system, and there is a problem that the structure becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a switching device for an optical member of a camera which does not break down the mechanism even during a runaway and has a simple structure. .

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a motor, a rotating plate having a driving pin and rotated by a rotational driving force from the motor, and a length engaging with the pin. A swing lever having a hole, which is reciprocated once by one rotation of the rotary plate, and is rotatably disposed independently of the camera body; the swing lever comes into contact with the swing lever; Comprising two optical members that are put in and out on the optical axis of the optical system, and one spring that urges the two optical members in a direction to attract each other, and when one of the optical members is retracted from the optical axis, The transmission of the driving force via the spring allows the other optical member to be inserted on the optical axis.

[0009]

According to the present invention, the rotating plate to which the rotational driving force from the motor is directly transmitted and the swing lever for switching the optical member are connected by the pin slot (pin and long hole), and the rotating plate is connected to the pin. The driving force is transmitted to the swing lever via the slot. The swing lever reciprocates once by one rotation of the rotary plate. Therefore, even if the motor runs out of control, the swing lever only repeats the reciprocating motion, so that no overload is applied and the mechanism is not destroyed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an optical member switching device for a camera according to the present invention; FIG.
2 is a configuration diagram showing one embodiment of a switching device for an optical member of a camera according to the present invention, and shows a telephoto state and a wide state, respectively.

As shown in these drawings, this optical member switching device mainly includes a rotating plate 10, a swing lever 12,
T lens 14, W lens 16, lens moving frames 18, 20
And a coil spring 22. The rotary plate 10 is adapted to receive a rotational driving force from a motor (not shown) via a speed reduction mechanism.
A is planted.

The swing lever 12 is rotatably provided by a support shaft 13. One end of the swing lever 12 is formed with an elongated hole 12A which engages with the pin 10A of the rotary plate 10, and the other end thereof is provided with two pins 12A.
B and 12C are planted. The T lens 14 and the W lens 16 are held by lens moving frames 18 and 20, respectively.
And 21 so as to be rotatable. The lens moving frames 18 and 20 have the swing levers 12 respectively.
The cam surfaces 18A and 20A to which the pins 12B and 12C can contact are formed, and the positioning pins 24 and 2
6 are formed with stoppers 18B and 20B that can abut. Further, a coil spring 22 is provided between the lens moving frame 18 and the lens moving frame 20.

Next, the operation of the optical member switching device of the above-described camera will be described. As shown in FIGS. 1 and 2, the rotating plate 10 and the swing lever 12 are pin-slot-coupled, whereby the swing lever 12 swings with the rotation of the rotating plate 10. Note that the swing lever 12 is connected to the rotating plate 10.
One rotation makes one reciprocation, so that even if the system runs away and the rotating plate 10 rotates continuously in one direction, the mechanism is not destroyed.

By the swing of the swing lever 12, the lens is switched between the T lens 14 and the W lens 16,
It is positioned at a predetermined position. That is, in the telephoto state, as shown in FIG. 1, the lens moving frame 20 has its cam surface 20A.
The W lens 16 is retracted from the optical axis I by being rotated by the pin 12C of the swing lever 12 which comes into contact with the lens. On the other hand, the lens moving frame 18 is urged in the CCW direction via the coil spring 22 by the retracted lens moving frame 20, and the stopper 18B contacts the positioning pin 24,
The T lens 14 is positioned on the optical axis.

Next, a case where the telephoto state is switched to the wide state shown in FIG. 2 will be described. In this case, the rotary plate 10 is rotated in the CW direction from the position shown in FIG. 1 as shown in FIG. 2, and accordingly, the swing lever 12 is rotated in the CCW direction about the support shaft 13.

At the initial stage of the rotation of the swing lever 12, only the lens moving frame 20 rotates in the CW direction, and the coil spring 22 contracts. Thereafter, the pin 12B of the swing lever 12 contacts the cam surface 18A of the lens moving frame 18, and the lens moving frames 18 and 20 are both rotated in the CW direction. When the stopper 20B of the lens moving frame 20 contacts the positioning pin 26, only the lens moving frame 18 is rotated in the CW direction, and as a result, the coil spring 22 is extended.

In this manner, the T lens 14 and the W lens 16 are alternately switched by the swing of the swing lever 12, and positioned on the optical axis I of the photographing optical system. When the lens moving frame 20 is retracted to the position shown in FIG. 1, a part of the cam surface 20A with which the pin 12C abuts is formed so as to coincide with the locus drawn by the pin 12C.
Therefore, when the pin 12C is on a part of the cam surface 20A, the lens moving frame 20 does not rotate even if the swing lever 12 rotates.

Similarly, the lens moving frame 1 is located at the position shown in FIG.
When the pin 8 is retracted, a part of the cam surface 18A with which the pin 12B comes into contact is formed so as to coincide with the locus drawn by the pin 12B. Therefore, when the pin 12B is on a part of the cam surface 18A, the lens moving frame 18 does not rotate even if the swing lever 12 rotates. In the present embodiment, the T lens / W lens is described as an optical member of the camera.
Parallel glass for focus adjustment may be used.

[0019]

As described above, according to the apparatus for switching the optical member of the camera according to the present invention, the rotating plate to which the rotational driving force from the motor is transmitted and the swing lever are connected by the pin slot. Therefore, even if the motor runs away, the swing lever only repeats the reciprocating motion, and the mechanism is not destroyed. Further, a motor that rotates only in one direction can be applied.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a telescopic state of a switching device of an optical member of a camera according to the present invention.

FIG. 2 is a configuration diagram showing a wide state of the apparatus of FIG. 1;

FIG. 3 is a configuration diagram showing a telephoto state of a conventional optical member switching device of a camera.

FIG. 4 is a configuration diagram showing a wide state of the apparatus of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotating plate 10A, 12B, 12C ... Pin 12 ... Swing lever 12A ... Long hole 14 ... T lens 16 ... W lens 18, 20 ... Lens moving frame 18A, 20A ... Cam surface 18B, 20B ... Stopper 22 ... Coil spring 24 , 26 ... Positioning pin

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naoki Takatori 3-1-146 Izumi, Asaka-shi, Saitama Fuji Photo Film Co., Ltd. (56) References JP-A-3-56946 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) G02B 7/14 G03B 17/04-17/17

Claims (2)

(57) [Claims] 1. A motor, a rotating plate having a driving pin and rotated by a rotational driving force from the motor, and a swing having a long hole engaged with the pin and reciprocating once by one rotation of the rotating plate. A moving lever, and two optical members that are independently rotatably disposed on the camera body, abut on the rocking lever , and move in and out of the optical axis of the photographing optical system by rocking the rocking lever. 1 for urging the two optical members in a direction to attract each other.
When one optical member is retracted from the optical axis,
By transmitting the driving force via the spring, the other light
A switching device for an optical member of a camera, wherein the optical member is inserted on the optical axis . Wherein said optical member switching device of the optical member of the camera according to claim 1, wherein the Tererenzu and wide lens der Turkey.