JPS638723A - Lens barrel of electronic still camera - Google Patents

Abstract

PURPOSE:To perform an operation in common to an electronic still camera and a silver salt still camera and to miniaturize the electronic still camera and to make it light-weight by providing a contact which converts the turning position of a convergence operation ring to an electric signal and transmits this output to the camera body side. CONSTITUTION:A lens barrel 20 has a mount part 30 inserted to or removed from the mount part 11 of a camera body 10 and is attached to or detached from the camera body 10. The resistance value of a aperture converging value storage medium 34 is read into the camera body 10 through a harness 36, a contact part 33, and a contact pin 14 to transmit the aperture converging value, and simultaneously, a minimum converging value is transmitted from a minimum converging value storage medium 35 through a harness 37, the contact part 33, and the contact pin 14. When the converging value of a diaphragm 24 is set by the convergency operation ring 23, the converging ring 23 is turned to move a relay member 24c, and this turning appears as the change of the resistance value of a variable resistor 26, and the resistance value of the set convergence instructing variable resistor 26 is transmitted to the camera body 10 through a harness 27, the contact part 33, and the contact pin 14.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lens barrel for an electronic still camera that records still image information on a recording medium such as a magnetic disk.

``Prior Art'' As a conventional technique, there is a technique related to a so-called silver halide still camera shown in FIG. 3, which is a conventional general system.

That is, a mechanism is provided for transmitting various photographic information between the lens barrel 1 and the camera body 2, and a mechanism for transmitting aperture value is provided to the aperture operation ring 1b linked to the aperture 1a for transmitting aperture information. A transmission projection IC is provided, a transmission projection 1d is provided for transmission of the open aperture value, and a transmission projection 1e is provided for transmission of the minimum aperture value.

On the other hand, the camera body 2 is provided with protrusions 2a to 2c that engage with the transmission protrusions IC to 1e, and are connected to electrical signal converters 2d to 2f, respectively.
d to 2f converted the transmitted information into electrical signals and sent them to the control section of the camera body.

In other words, in the lens barrel of a conventional silver halide still camera, a separate transmission mechanism was provided as necessary.

On the other hand, electronic still cameras have a small imaging area due to their structure, so it is possible to make the lens barrel smaller and the mount smaller. Based on this premise, it is desirable to make the lens barrel even smaller. There is.

On the other hand, the amount of information exchanged between the lens barrel and the camera body is increasing due to the trend toward automatic focus adjustment, various types of automation, and electrification. It is proposed to centralize and centrally communicate.

There are already a large number of existing 35111m silver halide still camera systems on the market, and their usage and operation methods are well known, so if electronic still cameras are to be popularized, it will not be very far from the 35ffim silver halide still camera system. If possible, it would be desirable to be able to share the lens barrel of the 35II1m silver halide still camera.

"Problems to be Solved by the Invention" If the structure of the lens barrel of the conventional 35a+m silver halide still camera is applied as is to the lens barrel of an electronic still camera, the transmission mechanism will become diverse as the amount of information increases. In addition, there is a problem in that the lens barrel not only becomes complicated and expensive, but also increases in size.

The present invention has been made in view of such conventional problems, and can cope with an increase in the amount of information, and
The object of the present invention is to provide a lens barrel for an electronic still camera that can be used in common with the operation mechanism of a lens barrel for a 35 mm film silver halide still camera.

"Means for Solving the Problems" The gist of the present invention for achieving the above object is to provide a lens barrel for an electronic still camera that records still image information on a recording medium such as a magnetic disk. .

a mount section, an aperture, an aperture operating ring rotatably provided on the outer periphery of the lens barrel for setting the aperture of the aperture, a conversion means for converting the rotational position of the aperture operating ring into an electrical signal; The present invention resides in a lens barrel for an electronic still camera, characterized in that the lens barrel includes a contact portion provided on a mount portion and transmitting an output of the converting means to a camera body side.

``Function'' However, the aperture information, which is one of the information to be transmitted, is handled in the same way as the lens barrel of an electronic still camera, which is equipped with a mount and an aperture control ring just like a conventional lens barrel. can be operated.

Aperture information, which is information to be transmitted between the lens barrel and the camera body, is obtained by converting the rotational position of the aperture control ring into an electrical signal by a conversion means, and the output is sent to the camera from a contact provided on the mount. It is transmitted to the main body side.

The aperture can be controlled manually using the aperture control port, or it can be controlled by the aperture control means provided on the camera body, and in cases where it is fully automated, it should be controlled only by the aperture control means provided on the camera body. This is to make it possible to do this.

"Example" Hereinafter, various embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the invention.

The mount part 11 of the camera body 10 of the electronic still camera has a locking notch 13 at the base of the insertion opening 12, and the mount part 30 of the lens barrel 20 is a cylindrical part that fits into the insertion opening 12 of the camera body 10. 31 has a locking protrusion 32 at the tip thereof. A passage groove (not shown) for a locking protrusion 32 is carved in the insertion opening 12 .

The mount portion 11 of the camera body 10 further includes a contact pin 1.
4 and a narrowing engagement lever 35 are provided.

The lens barrel 2o has an aperture operating ring 23 rotatably fitted onto a fixed barrel 22 that holds an optical system support barrel 21, and a mount portion 3o that is fixed to the fixed barrel 22. The support tube 21 has a lens 21a.

21b is retained.

A diaphragm 24 is connected to the support ring 24 in the optical path of the optical system support tube 21.
The operation ring 24b that changes the aperture value of the aperture 24 is connected to the aperture operation ring 23 by a relay member 24c, and is also engaged with the aperture engagement lever 15 of the mount section 11 of the camera body 10. The fitting transmission lever 25 is moved from the operating ring 24b to the mount portion 30.
It extends to

The relay member 24c engaged with the diaphragm operation ring 23 moves in the left-right direction in FIG. is provided on the aperture operation ring 23.

This variable resistor 26 constitutes a conversion means for converting the rotational position of the aperture operation ring 23 into an electric signal.

A contact portion 33 is provided on the end surface of the mount portion 30 of the lens barrel 20.
is installed, and the contact section 33 has a plurality of contacts that can be electrically connected to the plurality of contacts of the contact bin 14 of the mount section 11 of the camera body 10. The output of the variable resistor 26 for instructing the aperture setting is connected to some contacts of the contact section 33 of the mount section 30 through a harness 27.

The mount portion 30 of the lens barrel 20 further includes an open aperture value storage medium 34 that stores the open aperture value of the lens barrel 20 as a fixed resistance value, and a minimum aperture value storage medium that stores the minimum aperture value as a fixed resistance value. The body 35 is fixedly installed,
Open aperture value storage medium 34. The minimum aperture value storage medium 35 is connected to the contacts of the contact portion 33 by harnesses 36 and 37.

Next, the effect will be explained.

The lens barrel 20 can be attached to and removed from the camera body 10 by inserting and removing the mount portion 30 into the mount portion 11 of the camera body 10. That is, the locking protrusion 32 of the mount portion 30
is passed through the passage groove and through the insertion opening 12, and then twisted, the locking protrusion 32 is locked in the locking notch 13, and the lens barrel 20 is attached to the camera body 10, and the lens barrel 20 is removed by performing the reverse operation. be able to.

From the lens barrel 2o attached to the camera body 10, the resistance value of the open aperture value storage medium 34 is transferred to the harness 36 and the contact portion 3.
3. The maximum aperture value is transmitted by reading it to the camera body factory 0 via the contact pin 14, and is similarly transmitted from the minimum aperture value storage medium 35 to the harness 37. Contact portion 33. Contact bin 14
The minimum aperture value is transmitted via.

The aperture value of the aperture 24 is set using the aperture operation ring 23. This can be done from any of the aperture transmission levers 25. The aperture transmission lever 25 controls the aperture 2 from the camera body 10.
4, when the aperture engagement lever 15 operates on the camera body 10 side, the aperture is transmitted and the aperture 8-25 is moved, thereby operating the aperture 24 via the operating ring 24b. This mechanism constitutes a mechanical transmission mechanism that transmits information from the camera body 10 side to the lens barrel 20.

When setting the aperture value of the aperture 24 using the aperture operation ring 23, when the aperture operation ring 23 is rotated, the relay member 24c moves and the operation ring 24b connected to the support ring 24a moves.
rotates, and the aperture value of the aperture 24 changes. This change occurs as a change in the resistance value of the variable resistor 26 for indicating the aperture setting, which is linked to the movement of the relay member 24c. Contact part 3
3 to the camera body IO side via the contact pin 14 of the camera body 10, and is transmitted to the aperture operation ring 2 on the camera body 10 side.
The operating status of 3 can be monitored.

FIG. 2 shows a second embodiment. Since this embodiment has most of the configurations in common with the first embodiment, similar parts are given the same reference numerals and redundant explanation will be omitted.

In this embodiment, the relay member 24c is abolished, and the diaphragm operation ring 23
The variable resistor 26 for instructing the setting aperture outputs a resistance value according to the rotation angle of the aperture operation ring 23.

The operation of this embodiment is as follows.

The attachment and detachment of the lens barrel 20 is the same as in the first embodiment,
The mode of transmission of the open aperture value and the minimum aperture value is also the same, but the way the aperture 24 is operated is different.

That is, even if the aperture operation ring 23 is rotated, the aperture 24 is not directly operated, but the resistance value of the variable resistor 26 for instructing the aperture setting changes. This resistance value is harness 27
．． A signal is transmitted from the contact portion 33 to the camera body 10 side via the contact pin 14 of the camera body 10, and the amount of operation of the aperture engagement lever 15 corresponding to this change in resistance value is transmitted to the camera body 10.
The aperture value of the aperture operation ring 23 is set by operating the aperture engagement lever 15.

It is also possible to operate the aperture engagement lever 15 by directly setting the aperture value using a control section provided on the camera body 10 side without using the aperture operation ring 23.

In addition, in the above embodiment, the aperture 2 from the camera body 10 side
4 is shown mechanically operated by the aperture engagement lever 15, but it may be operated by a rotary shaft and a coupler, or electrically, and a motor or the like for driving the aperture 24 may be provided in the lens barrel 20. Although all information transmission may be performed electrically, it goes without saying that mechanical information transmission may also be used.

"Effects of the Invention" According to the lens barrel of an electronic still camera according to the present invention,
The structure of the mount and the aperture control ring are similar to those of the lens barrel of a silver-halide still camera, and information is transmitted electrically to avoid complexity and size, allowing for common operations. There is no confusion, and it is advantageous in terms of cost, and it is possible to achieve reduction in size and weight.

According to the second embodiment, there is no need for a mechanical mechanism for interlocking the diaphragm and the diaphragm operation ring, so costs can be reduced, and since the diaphragm and the diaphragm operation ring are not connected, the diaphragm can be adjusted easily. This has the advantage of increasing the degree of freedom in photographing without being restricted by the aperture control ring.

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a vertical cross-sectional view showing a lens barrel and a part of the camera body facing each other. FIG. The figure shows the same conventional example. 10...Camera body 11...Mount part 14.
... Contact pin 15 ... Squeezing engagement lever 20
...Lens barrel 21...Optical system support tube 23...
・Aperture operation ring 24...Aperture 25...Aperture transmission lever 26...Variable resistor 30 for instructing setting aperture...Mount part 33...Contact part 34...Open aperture value memory body 2nd move 3rd figure

Claims (3)

[Claims] (1) In the lens barrel of an electronic still camera that records still image information on a recording medium such as a magnetic disk, a mount, a diaphragm, and a diaphragm are rotatably provided on the outer periphery of the lens barrel to adjust the opening of the diaphragm. An aperture operating ring for setting the aperture, a converting means for converting the rotational position of the aperture operating ring into an electric signal, and a contact section provided on the mount section and transmitting the output of the converting means to the camera body side. A lens barrel for an electronic still camera characterized by: (2) The electronic still camera according to claim 1, wherein the aperture is controlled by an arbitrarily selected one of the aperture operation ring and an aperture control means provided on the camera body side. lens barrel. (3) The lens barrel for an electronic still camera according to claim 1, wherein the aperture is controlled only by an aperture control means provided on the camera body side.