JPH05341371A - Information transmitting device for camera system - Google Patents

Abstract

PURPOSE:To provide an information transmitting device for a camera system capable of transmitting the information of an interchangeable lens a camera body side with a simple configuration. CONSTITUTION:In the information transmitting device for the camera system in which the plural interchangeable lenses (photographing lenses) 10 can be selectively attached/detached to/from a camera body 11 and in which information is transmitted between both the camera body 11 and the interchangeable lens 10, the information is transmitted between both the camera body 11 and the interchangeable lens 10 through a bar code (lens information) 10a storing the information of the lens itself on the interchangeable lens 10 and a reader part (bar code reader) 11a reading the bar code 10a to the body side when the interchangeable lens 10 is attached to the camera body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission device for a camera system in which a plurality of interchangeable lenses can be selectively attached to and detached from a camera body.

[0002]

2. Description of the Related Art Generally, in a camera system, it is necessary to transfer information between the camera body and the interchangeable lens. This is because the type of interchangeable lens is determined on the camera body side, and information such as the focal length of the interchangeable lens and the open F value is transmitted to the camera body side. Therefore, the CPU (Center-Pr
Ocesser-Unit) and memory are built in, and various information of the interchangeable lens is stored in these CPU and memory.

[0003]

However, in the above-mentioned conventional camera system, the CPU is provided in the lens.
Although it has a large amount of information stored because it has a memory, a memory, etc., there is no choice but to increase the number of electrical parts for transmitting such information between the camera body and the interchangeable lens, which increases the cost. It was a factor.

In particular, there are relatively few types of interchangeable lenses,
In a small-scale system constructed by a camera body and several types of interchangeable lenses, it is inevitable to increase the cost of the entire system by providing a memory for each lens. An object of the present invention is to provide an information transmission device of a camera system capable of transmitting information on an interchangeable lens to the camera body side with a simple structure.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a plurality of interchangeable lenses can be selectively attached to and detached from a camera body. In an information transmitting device of a camera system for transmitting information, a camera body (11); an interchangeable lens (10) having a bar code (10a) in which lens information is stored; an interchangeable lens mounted on the camera body side A reader unit (11a) capable of contacting or approaching the barcode when read, and capable of reading the lens information by the contact or approach; and processing the lens information read by the reader unit provided on the camera body side. It is composed of an information processing means (16).

[0006]

According to the information transmission device of the camera system of the present invention, when the interchangeable lens is mounted on the camera body, the lens information is read by the reader portion coming into contact with or approaching the barcode.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a perspective view of the camera system according to this embodiment, and FIG. 1B shows a state in which the interchangeable lens is removed from the camera body. 2 (a) is a view of the camera body as viewed from the front, and FIG. 2 (b) is a view of the interchangeable lens as viewed from the bayonet side.

In FIG. 1 (a), an arc-shaped bar code 1 for storing information about the interchangeable lens is provided on the outer peripheral side of the bayonet 2a of the interchangeable lens 2. This bar code 1 may be a line stamped with paint,
You may stick a plate or sticker with a barcode printed on it. Here, since the barcode is already known, detailed description thereof will be omitted. However, the barcode has a plurality of adjacent strip-shaped patterns, and the width of these strip-shaped patterns and the interval between the adjacent strips are read. Information is transmitted by. The barcode may be one that optically detects information (for example, a photo reflector or the like) or one that magnetically detects information.

In this embodiment, information about the interchangeable lens 2 itself, such as various information such as the focal length and the open F value, is transmitted to the camera body 4 side. Therefore, the width and interval of the strip pattern in the barcode 1 are different depending on the type of interchangeable lens. An arc-shaped bar code reader 3 corresponding to the bar code 1 is provided on a part of the bayonet mount portion 4a of the camera body 4. When the interchangeable lens 2 is attached to the camera body 4, the bayonet 2a and the mount portion 4a are engaged with each other and the interchangeable lens 2 is rotated by a predetermined angle, and the barcode reader 3 moves on the barcode 1. By this movement, the width and interval of the belt-shaped pattern are determined and the information of the interchangeable lens is read. Further, the barcode reader 3 has the following configuration because it only needs to operate when the lens is attached. That is,
A conductor pattern 2b is provided on a part of the lens bayonet 2a, and only when the conductor pattern 2b and the contact 5 of the camera body are in a conductive state, the bar code reader 3 is activated and the lens information can be read. It is possible. Therefore, when the conductor pattern 2b and the contact 5 of the camera body are in a non-conductive state, the operation of the bar code reader 3 is prohibited at all.

FIG. 3 is a block diagram of the camera system in this embodiment. In FIG. 3, the CPU 11b reads information from the lens data ROM (Read-Only-Memory) 11c according to the read barcode information 10a. The switch 12 corresponds to the conductor pattern 2b and the electric contact 5 in FIG. 1 (b), and operates the bar code reader 11a.
Control stop. Further, the CPU 11b uses the warning means 11d.
When the barcode reader 11a starts erroneous reading and there is no signal or an error occurs, the photographer is warned to that effect. As a result, the problem that the photographer does not notice that there is an abnormality in the transmission of lens information does not occur.

As the warning means, a means for giving a visual warning by a display unit capable of external display, a means for generating a warning sound by a sound generating means such as a buzzer, and the like are preferable.

[0012]

As described above, according to the present invention, when the interchangeable lens is mounted on the camera body, the lens information is read by the reader portion coming into contact with or approaching the bar code. It is not necessary to provide a CPU, a memory or the like, and it is possible to provide an information transmission device of a camera system capable of transmitting lens information between both the camera body and the interchangeable lens with an extremely inexpensive and simple configuration.

[Brief description of drawings]

FIG. 1A is an overall perspective view of a camera system according to an embodiment. (B) It is a figure which shows the state which removed the interchangeable lens in a present Example from the camera body.

FIG. 2A is a front view of the camera body in the present embodiment. (B) It is the figure which looked at the interchangeable lens in a present Example from the bayonet side.

FIG. 3 is a block diagram of a camera system in this embodiment.

[Explanation of symbols]

 1 Bar Code 2 Interchangeable Lens 2a Bayonet 2b Conductor Pattern 3 Bar Code Reader 4 Mount 5 Electrical Contact 10 Interchangeable Lens 10a Bar Code 11 Camera Body 11a Bar Code Reader 11b CPU 11c Lens Data ROM 11d Warning Means 12 Electric Contact Part

Claims (4)

[Claims] 1. A camera system in which a plurality of interchangeable lenses can be selectively attached to and detached from a camera body and information is transmitted between both of the camera body and the interchangeable lens. An interchangeable lens having a stored bar code; provided on the camera body side,
A reader unit that can contact or approach the barcode when the interchangeable lens is attached, and can read the lens information by the contact or approach; provided on the camera body side and read by the reader unit An information transmission device for a camera system, comprising: an information processing unit that processes the lens information. 2. An information transmission device for a camera body, wherein a plurality of interchangeable lenses are selectively attachable / detachable and information is transmitted to / from the interchangeable lenses, the interchangeable lenses being mounted when the interchangeable lenses are mounted. A reader unit capable of contacting or approaching a bar code in which its own lens information is stored and capable of reading the lens information by the contact or approach; an information processing means for processing the lens information read by the reader unit An information transmission device for a camera body, comprising: 3. An information transmission device of an interchangeable lens, which is selectively attachable to and detachable from a camera body and which transmits information to and from the camera body, having a bar code in which lens information is stored, Information of the interchangeable lens, characterized in that the lens information is transmitted to the camera body side by a reader unit provided on the camera body side coming into contact with or approaching the barcode when mounted on the camera body. Transmission device. 4. Detection means for detecting an abnormality in the reading of the lens information; warning means for issuing a warning when the detection means detects an abnormality in the reading of the lens information. The information transmission device for a camera system according to claim 1, further comprising: