JPS5872134A - Safety device for electric signal transmitting and receiving means of optical apparatus - Google Patents

Abstract

PURPOSE:To prevent a defective conduction or the like, by providing a shielding means which covers a camera-side or interchangeable lens barrel-side electric signal transmitting and receiving means while the interchangeable lens barrel is removed from an optical apparatus body such as a camera. CONSTITUTION:A safety device has a shielding means which covers an electric signal transmitting and receiving means in the camera side or that in the side of an interchangeable lens barrel 1 while the interchangeable lens barrel 1 is removed from an optical apparatus body such as the camera. That is, a shielding member 14 is formed to a shape like an arc approximately and has one end side 14A supported axially by a shaft 14' and has the other end side 14B formed to shield electric contacts 10A-10E. Thus, the lens-side or camera- side electric contact is protected from dust, water, oil, etc. to prevent trouble of the camera.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a safety device for electrical signal receiving means such as electrical contact terminals of optical equipment such as interchangeable lenses or cameras that control exposure and information display using electrical signals.

In recent years, Kt! Electromagnetic aperture control devices using air energy, and aperture devices incorporating a stepping motor or a linear motor and controlling the aperture diameter using the driving force of the motor have been proposed.

These electric aperture devices send digital or analog electric signals from the camera to the lens barrel to control the aperture aperture using an electromagnetic device or motor. Or, conversely, a digital or analog electrical signal from an aperture device within the lens barrel is sent into the camera, and the exposure mechanism within the camera is controlled by the electrical signal.

As mentioned above, the electrical signal receiving means for receiving and receiving electrical signals of the lens barrel, which has the function of receiving and receiving electrical signals into and out of the lens barrel, for example, the electrical contact is attached to the lens barrel and the camera.・Due to the separation relationship and the arrangement of the GAX optical system within the lens barrel, its location and position must be restricted, and it cannot be placed on or near the mounting means of the lens barrel. It is done a lot.

In addition, the electrical contacts on the lens barrel side mentioned above are resistant to dirt, oxidation due to moisture in the air, and oil from people's fingers when attaching and detaching the lens barrel, making them difficult to connect with the electrical contacts on the camera side. Failures due to K are most likely caused by poor conduction and poor contact. The above-mentioned problem also applies to intermediate tubes installed between the camera and lens, extenders, and accessory accessories that are attached to and detached from other photographic devices.

As mentioned above, an object of the present invention is to provide an apparatus for ensuring the safety of the receiving and receiving operation of the electric signal receiving means in an optical instrument such as a lens barrel or a camera, which is equipped with the electric signal receiving means.

Furthermore, the present invention provides means for automatically covering the electrical signal receiving and transmitting means when the lens barrel or camera is removed from the photographing device or the lens barrel, and when the lens barrel is removed, the electrical signal receiving and transmitting means is automatically covered. It is an object of the present invention to provide a lens barrel or a camera in which the means is not exposed to the outside and the electric signal receiving means is protected from the above-mentioned dust, moisture, oil, etc.

In addition to the above-mentioned objects, another object of the present invention is to automatically eliminate means for covering the electric signal receiving means when the above-mentioned camera or lens barrel is attached to the lens barrel or camera; To provide a lens barrel in which electric signal receiving means can be coupled between the lens barrel and a photographing device by a conventional operation of attaching the lens barrel to the photographing device.

The present invention will be described in detail below with reference to the drawings, but the example of the camera will be omitted since the embodiment of the safety device for the lens barrel can be directly applied to the camera.

An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

This is a lens barrel whose entire body is represented by 1, and is a fixed lens barrel whose end surface is shown in the second figure. ! lll1 The bayonet claw fitting, which is configured to be rotatable around the optical axis with respect to the fixed lens barrel 2 and not to come out from the fixed lens barrel, is a ring.
and its bayonet claw 3a1. ,.

3m and K are connected to a camera-side bayonet member to be described later, and the lens barrel 1 is attached to the camera.

4 is an aperture setting ring fitted into the fixed lens barrel 2.

Reference numeral 5 denotes a positioning pin for connecting the lens barrel and camera at a predetermined position, and is implanted in the fixed lens barrel 2 described above.

Reference numeral 6 denotes a lid member that covers the end face of the fixed lens barrel, and electrical contacts shown in FIG. 2 are arranged inside the lid member.

6a is an opening provided in the lid member 6.

FIG. 1B shows a mount section that is attached to the front of a camera body (not shown), and a holding plate that holds a bayonet mount member 8 is fixed to the camera body (not shown).

The bayonet mount member 8 has a bayonet claw 8 that connects with the bayonet of the lens side bayonet mount 3a.
a, , , are provided. 9A, 9B,,,9m
indicates an electric signal contact placed on the holding plate 7 etc. on the camera side, and the electric signal contact is connected to the notch 8a formed in a part of the bayonet mount member 8 on the camera side, with the positioning pin 6 of the lens barrel l. After engaging and inserting each bayonet claw into the bayonet notch Klfi of the other party, tightening is carried out by rotating the ring 3 so as to bring it into contact with the electric signal contact on the lens side.

Figures 2 and 3 show safety devices covering electrical signal contacts;
FIG. 2 shows the lens barrel 1 removed from the camera, and FIG. 3 shows a front view of the lens barrel when the lens barrel is attached to the camera. Figure 2.

In both Figures S, the lid member shown in Figure 1 has been removed. In Figures 2 and 3, IOA and IOB
This is an electrical signal contact on the lens side attached to the fixed lens barrel 2, and the contact 10A is an electrically insulating contact at the entrance of the opening hole 2& formed in the fixed lens barrel as shown in Figure 4. A board 11 is pasted, an electrical contact 10A is fixed to the insulating board 11, and one conductor 12 is connected to a motor (not shown) or a motor control circuit or electrically! Connect to the magnetic diaphragm device.

In FIGS. 2 and 3, IN is the fixed lens barrel 2KM1.
4'jC, the shielding member 14 is formed into a substantially circular arc shape, and one end side 14A is connected to the shaft 1.
4', and the other end side 14B is the electrical contact 10A, .

Form the iolg so that it can be covered. Shielding member 14
A biasing means consisting of an am#i pin 15 and a spring member 16 is provided at one end, so that when the lens barrel 1 is detached from the camera or in a detached state, the shielding member 14 contacts the electrical contact 10.
10K, and when the lens barrel is attached to the camera and in the attached state, the shielding member 14 connects to the electrical contact 10A.
, 10 so that it can be evacuated from the front. That is,
A spring member 16 is stretched around the shaft support end 14m of the shielding member 14, and biases the shielding member 14 clockwise about the shaft 14'. The bottle member 16 is a lens barrel 2 that constitutes a part of the fixed lens barrel 2.
A through hole is provided in b, so that one end of the bottle 15 is exposed through the through hole, and the other end is engaged with the end of the shielding member so as to resist the biasing force of the spring member (6).

FIG. 4B shows a cross-sectional view of FIG. 1B in direction B, -9,
The electrical contacts on the camera side will be explained. Electrical contact 9 on the camera side
A. Parts 8b, 8 of the 91 camera side mount member 8
An opening hole is formed in the insulating part 18 and 19, a coil spring 20 is used to apply force, and a conductor 21 is attached to one end.
Connect.

Next, the operation of the safety device having the above configuration will be explained.

When the lens barrel l is removed, the brass shielding member 14i
The spring member 16 applies a force to rotate clockwise around the shaft 14', and one end 141 closes the opening 6& of the lid member 6 in front of the lens-side electrical signal contacts 10A, . . . IOE.

When the lens barrel and the camera bayonet mount are connected to each other in order to attach the lens lock barrel to the camera, the ring inner diameter part 8o of the camera side bayonet mount member 8 is used to move the head of the lens side bottle 15 in the direction of the arrow. By pressing, the shielding member 14 rotates counterclockwise about the shaft 14', and one end 14B of the shielding member 14 is retracted from the front surface of the lens-side electrical contact.

The mounting operation is performed by aligning the lens barrel and the camera bayonet mount member with each other and rotating the ring 3 to tighten the lens ridge tube side.

Then, the opening 6a of the lens-side cover member 6 is inserted into the camera-side electrical contacts 9A, . . . 9, and the lens-side electrical contacts 1
Contact is made with 0A, . . . , 10.

When the lens barrel 1 is removed from the camera, when the bayonet mount member 8 of the camera is pulled out, the spring 16 holds the bottle 15 in the state shown in FIG. 4A! Return to lK, close the opening 6&tt of the lid member 6 with the shield part 14, and close the electrical contact 10A.
, protect 101c.

As described above, the present invention enables electrical continuity with the camera side electrical contacts with high reliability by providing a shielding member that protects the electrical contacts on the lens side or the camera side from dust, water, oil, etc. This invention is a useful technology in electronically controlled vibration system lenses and cameras.

In particular, in the configuration of the lens barrel shown in the embodiment, the electrical contact 10A a@e IOE is disposed within the sealed space 22 formed by the fixed mirror 2.2o and the lid member 6 as shown in FIG. 4A, Camera, side signal terminal 9A...9
Since contact with E is made only through the aperture 11,
It has a structure suitable for preventing the intrusion of dust, water, oil, etc. from outside the sharp lens barrel, and is the most practically effective invention for body membranes of electrical contacts.

The present invention has been described with reference to an example of the relationship between a camera and an interchangeable lens, but the present invention is not limited to the above-mentioned examples, but may include an intermediate tube, an eftender, a stone-removal type filter device, a liquid crystal device, etc. It is also possible to apply it to a drive unit, a stator unit, etc.

[Brief explanation of drawings]

FIGS. 1A and 1B are perspective views showing the lens barrel and the mound of the camera. FIG. 2 shows a front view of the lens barrel 1, with the lid member 6 removed and the electrical contacts 10A, . A diagram covering 101c. FIG. 3 is a diagram showing the Fi shielding member 14 being retracted. FIG. 4A is a sectional view taken along line 1-A of FIG. 1A. FIG. 4B is a sectional view taken along line B1-B of FIG. 1B. FIG. 5 is a cross-sectional view of the main part of the mount section when the lens barrel and camera are combined, showing the movement gate of the cover member 14. 116. Lens barrel, 2, Fixed C-shape, 3,...
1. V indicates ring, 6, M member, IOA, . 101n, - air contact point, 14,... shielding member

Claims (1)

[Claims] Having a tracking means that covers the electrical signal receiving means on the camera side or the electrical signal receiving means on the interchangeable lens barrel side when the interchangeable lens barrel is removed from the main body of an optical device such as a camera. A safety device for an electric signal receiving means of an optical device such as a lens barrel or a camera, characterized by: