JPH0633457Y2 - Connection device between shutter and control circuit of variable focus camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a method for connecting a shutter in a camera with a variable focal length and a control circuit on the camera body side.

2. Description of the Related Art Conventionally, in order to change the focal length, each lens of the front group and the rear group is moved back and forth, and at the same time, the shutter is also moved back and forth integrally with the lens of the front group or the rear group. Since the shutter moves back and forth, a mechanism for expanding and contracting was provided when the shutter was connected to the exposure control circuit on the camera body side.

Problems of Prior Art The conventional method requires a mechanism for expanding and contracting the connection between the shutter and the exposure control circuit on the camera body side, which is disadvantageous in terms of cost. Further, there is not enough space in the lens barrel portion, and it is often impossible to incorporate a complicated mechanism for expansion and contraction. There was a design problem even if it was installed by force.

Means for Solving the Problem A taking lens system consisting of two groups, a front group and a rear group, a shutter that slides together with the taking lens, a sliding ring partially having a hollow portion, and a sliding ring inside the sliding ring. A flexible printed circuit folded in an S shape, a guide member covering a part of the circuit, a fixed cylinder fixed to the camera body and having a built-in sliding ring, and a cam ring that rotates to move the sliding ring back and forth. , A flexible printed circuit having an S-shaped flexible printed circuit, which is composed of a mounting member mounted on the cam ring and partially having a gear, and a lens barrel for holding a photographing lens system, and a guide member provided in the cavity. Even if the shutter moves back and forth, it prevents it from bending and breaking irregularly and expands and contracts smoothly.

Embodiment FIG. 1 is a schematic plan view showing the structure of the present invention, FIG. 2 is a view showing the main parts thereof, and FIG. 3 is a view showing the operating state of FIG. Reference numeral 1 is a front cover attached to the camera body 27. The camera body 27 is provided with a cartridge chamber 3 and a spool chamber 4, and is also provided with a battery chamber 5. The rear lid 2 is attached by a hinge so as to be openable and closable, and a pressure plate 25 is installed on the rear lid 2 by a pressure plate spring 26. 6 is a condenser, and this portion projects to the front of the camera and acts as a grip. A cam ring 8 is fitted to the fixed barrel 7 attached to the camera body 27. A mounting member 9 is fixedly mounted on the cam ring 8, and a gear 10 is provided on the mounting member 9 and meshes with a gear 11. The gear 11 is connected to a drive source by a gear train (not shown). 12 is a gear
It is a rotating shaft of 11 and is attached to a fixed plate 13. A sliding ring 14 is slidably attached to the fixed cylinder 7. A cavity is provided in the sliding ring 14, and the connecting flexible member 20 is bent and installed in an S shape. Then, the portion of the connecting flexible member 20 on the camera body side is sandwiched by the guide member 21 and the sliding ring 14, and the fixed barrel 7 is further guided by the guide member.
It is screwed by a screw 22 while 21 is pressed. The fixed barrel 7 is provided with a long hole extending in the front-rear direction of the camera, and the cam ring 8 is provided with a plurality of long holes also serving as oblique cam surfaces, which are incorporated in the first lens frame 17. The lens system of the front group is attached to the two elongated holes provided in the fixed barrel 7 and the cam ring 8 while being fitted to the lens barrel 18. Further, the rear group lens system incorporated in the second lens frame 24 is fitted in the sliding frame 23 and is also attached to the two long holes. The shutter 15 is screwed to the cam ring 8 with screws 19.
On the other hand, a decorative member 16 is attached to the front part of the sliding ring 14.

Next, the operation of the connecting device having the above configuration will be described.

First, when an operating member (not shown) is operated to change the focal length, the drive source is driven and transmitted to the gear 11 via the gear train. The rotation of the gear 11 causes the mounting member 9 and the cam ring 8 to rotate. Since the cam ring 8 and the fixed barrel 7 are provided with elongated holes, the lens groups of the front group and the rear group are moved by the elongated holes. The shutter 15 and the sliding ring 14 move integrally with the lens system of the front group. At this time, the connecting flexible member 20 connected to the shutter 15 also expands and contracts, but the curved shape remains. The state is shown in FIGS. 2 and 3. At this time, the lens system of the rear group moves differently from the lens system of the front group. This movement is fixed cylinder 7
And the shape of the long hole provided in the cam ring 8. The lens system of the rear group is attached to the elongated hole by a pin provided on the sliding frame 23. The lens system of the front group is incorporated in the first lens frame 17, and the lens barrel 18 and the shutter are
It is installed on the sliding ring 14 together with 15, and is attached to the elongated hole by a pin (not shown) provided on the sliding ring 14. As a result, the lens systems of the front group and the rear group move, but the connection flexure expands and contracts with this movement.
Since the connecting flexible member 20 is partially pressed by the guide member 21, the connecting flexible member 20 is not bent and damaged even when the sliding ring is moved back and forth. In addition, it is flexible to connect 20
It is one of the S-shaped curves, and the amount of movement of the other curve is small.

Effects As described above, according to the present invention, a complicated device is not required to connect the slidable shutter and the exposure control circuit on the camera body side, and it is inexpensive and excellent. is there. Further, in the present invention, since the flexible printed circuit (hereinafter referred to as “flexible”) is only bent without being bent, the possibility that the flexible cable will be disconnected is low, and the flexible cable is contained in the cavity of the sliding length, and it should be protected in the optical path. No diffuse reflections will occur. Further, in the present invention, since the guide member is provided, it is possible to prevent the flexure from being bent and broken irregularly even when the sliding ring slides.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing the structure of the present invention, and FIG.
FIG. 3 and FIG. 3 are views showing the main part thereof. FIG. 2 shows a standard photographing state, and FIG. 3 shows a telephoto photographing state. 1 ... Front cover, 2 ... Rear lid 3 ... Patrone chamber, 4 ... Spool chamber, 5 ... Battery chamber, 6 ... Condenser, 7 ... Fixed cylinder, 8 ... Cam ring, 9 ... Mounting member, 12 ... … Gear rotating shaft, 13 …… fixing plate, 14 …… sliding ring 15 …… shutter, 16 …… decorative member 18 …… lens barrel, 20 …… flexible connection 21 …… guide member, 23 …… sliding Frame 25: Pressure plate, 27: Camera body

Claims (1)

[Scope of utility model registration request] 1. A taking lens system consisting of two groups, a front group and a rear group, a shutter that slides together with the taking lens, a sliding ring partially having a hollow portion, and an S in the sliding ring.
A flexible printed circuit folded in a V shape, a guide member that covers a part of the circuit, a fixed cylinder that is fixed to the camera body and has a built-in sliding ring, a cam ring that rotates to move the sliding ring back and forth, A connecting device for a shutter and a control circuit of a variable focus camera, which comprises an attaching member attached to the cam ring and partially having a gear, and a lens barrel holding a taking lens system.