JPH0435877Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a warning device for cameras, specifically for cameras that require interchangeable lenses, such as single-lens reflex cameras, when the lens barrel is not installed in the correct position. This relates to a camera warning device that displays this as a warning.

[Prior Art] Cameras having an information transmission device that electrically transmits various photographic information such as aperture information and distance information from the photographic lens side to the camera body side are already well known. In this type of camera information transmission device, when the photographing lens barrel is attached to the camera body, the electrical contacts provided on the lens barrel side and the electrical contacts provided on the lens mount of the camera body are connected, and the The set shooting information is transmitted to the camera body. In addition, as is well known, the lens barrel of a photographic lens is attached to the lens mount of the camera body with a bayonet or screw, and in both cases, the lens barrel is rotated and the lens barrel is placed in a predetermined position relative to the camera body. When the rotation angle position is reached, the electrical contact on the lens barrel side and the electrical contact on the camera side are connected. However, the lens barrel is often attached to the camera body in a position that is slightly shifted from the predetermined rotation angle position, and even in such cases, the mechanical attachment state of the lens barrel and camera body For example, if there are several types of photographic information to be transmitted from the lens barrel side to the camera side, and the electrical contacts related to these various types of photographic information are arranged close to each other, the Electrical contacts with different shooting information on the camera side and the camera side may connect to each other. In such a case, the camera will naturally be controlled based on different types of photographic information, resulting in malfunction of photographing control. In addition, if a lens barrel without an information transmission device is attached, or if a lens barrel with an information transmission device does not transmit information because the electrical contacts do not match, the information from the lens barrel may be lost. This has the disadvantage that the photographer may take a picture without knowing that the information will not be transmitted, resulting in a failure in the picture.

[Problems to be Solved by the Invention] The purpose of the invention is to eliminate the above-mentioned problems of the conventional technology, and the purpose of the invention is to solve the above-mentioned problems with the conventional technology. It is an object of the present invention to provide a warning device for a camera which displays a warning when a failure occurs.

[Means and effects for solving the problem] A photographic information output means provided on the lens barrel of the photographic lens; When the lens barrel is attached to the camera body, the photographic information output means is used to output the photographic information of the camera body. a connection means for electrically connecting the input means and the photographic information detection means; a first switch means that operates depending on whether or not the lens barrel is properly attached to the camera body; and the photographic information input means and the photographic information. A second switch is inserted between the detection means and the connection means, and transmits the photographic information to the photographic information input means and the photographic information detecting means when the first switch means is activated, and prevents the same from being transmitted when the first switch means is not activated. a switch means; and a warning means connected to the photographic information detection means and activated when the photographic information detecting means detects a non-transfer state of the photographic information, and when the lens barrel is not properly attached to the camera body, the above-mentioned connection The present invention is characterized in that the means is electrically disconnected from the photographing information input means and the photographing information detecting means, and a warning is displayed based on the output of the photographing information detecting means.

[Example] The present invention will be described below based on an illustrated example.

FIG. 1 is an electrical circuit of the camera warning device of the present invention. The information transmission device including the mode switching device in this camera includes variable resistors 2, 3, and 4 for setting photographing information, which are photographing information output means provided in the lens barrel 1 of the photographic lens; Analog switches 6, 7, and 8 for transmitting information forming a second switch means provided on the input side of the camera 5 in order to guide various photographic information set by 4 to the photographing control circuit in the camera 5 as input information. and a lens attachment that is provided on the lens barrel 1 and forms a first switch means that closes and turns on the analog switches 6, 7, and 8 when the lens barrel is attached to a predetermined position on the camera body. A status detection switch 9 and analog switches 6, 7,
8 and electrical contacts 10 to 13 provided on the lens barrel 1 and electrical contacts 14 to 17 provided on the camera 5 for connecting the detection switch 9 to each control terminal of the analog switches 6 to 8. and lens barrel 1
Even if the analog switch 7 and 8 are attached to the camera 5,
a warning circuit 18 that operates when the camera is off, a mode changeover switch 19 that switches the camera to each shooting mode of shutter priority, aperture priority, and manual, and a shooting mode that is selected according to the switching state of this mode changeover switch 19; Mode change switch 1
9 is switched to shutter priority mode, the mode selection circuit 20 automatically selects aperture priority or manual mode when the analog switches 7 and 8 are off, and other shooting information control circuits. It is configured.

The variable resistors 2, 3, and 4 are for aperture operation detection, aperture setting, and distance setting, respectively, and one end of each is connected to the electrical contacts 10, 11 of the lens barrel 1,
12, and the other end is grounded. Also,
One end of the detection switch 9 is connected to the electrical contact 13 of the lens barrel 1, and the other end is grounded. Further, one ends of the analog switches 6, 7, 8 are electrical contacts 14, 15, 16 of the camera 5, respectively.
The control terminal is connected to the electrical contact 17 of the camera 5. Therefore, when the lens barrel 1 is attached to the camera 5, the resistors 2, 3, and 4 are
are electrically connected to the analog switches 6, 7, and 8, respectively, and the detection switch 9 is connected to control the analog switches 6, 7, and 8.

The lens mounting state detection switch 9 is attached to the lens barrel 1 of the photographic lens, for example, in the configuration shown in FIG. That is, the detection switch 9 is disposed at the rear end 22 of the lens barrel 1 facing the lens mount 21 of the main body of the camera 5. This detection switch 9 is composed of two leaf springs, one of which has a fixed side contact piece 9a fixed to the rear end portion 22 of the lens barrel with a screw 23, and the other movable side contact piece 9b has a fixed side contact piece 9a fixed to the rear end portion 22 of the lens barrel. It is fixed to a locking portion 25a of a lens attachment/detachment button 25 that protrudes from a notched groove 24 provided in the portion 22. As shown in FIG.
6 gives it the habit of protruding to the outer periphery of the lens barrel 1, and for this reason, there is an L at the lower end of the attachment/detachment button 25.
The lock portion 25a, which is formed in a letter shape and whose tip protrudes from the notch groove 24, is connected to the lens attachment/detachment button 2.
5 is in a free state, the lock portion 2 is located at the end of the lens barrel 1 near the outer periphery within the notch groove 24.
A movable side contact piece 9b, which is integral with the movable side contact piece 5a, is brought into contact with the fixed side contact piece 9a. That is, the detection switch 9 is closed while the lens attachment/detachment button 25 is free. The fixed contact piece 9a of this detection switch 9 is connected to the electrical contact 13, and the movable contact piece 9b is grounded.

On the other hand, the shape of the lens mount 21 of the main body of the camera 5 to which the lens barrel 1 is attached is as shown in FIG.
When the lens barrel 1 is rotated counterclockwise after facing and brought into close contact with each other, the lens barrel 1 is configured to be locked and attached to the lens mount 21 of the camera 5 at a predetermined rotation angle position. has been done. That is, when the lens barrel 1 is attached to the lens mount 21 by bringing them into close contact at their mutually positioned portions, the lock portion 25a allows the lens barrel to fit into the opening 27 inside the lens mount 21 without being obstructed by the lens mount 21. 1
It is arranged as shown by the chain line at a position that does not interfere with the photographic lens 28 and its support tube 29. and,
Leave lens barrel 1 as is and attach lens mount 2.
When the lens barrel 1 is rotated counterclockwise around the optical axis O relative to the lens barrel 1, the lens barrel 1 is mounted on the lens mount 21 by a bayonet mechanism (not shown). It will move in the direction shown by arrow A along the inner peripheral edge of the mount 21. The lens mount 21 is
A portion of the inner peripheral edge 21a from the first position of the lock portion 25a to the left is formed into a cam edge shape such that the distance from the optical axis O gradually becomes shorter, and furthermore, a portion of the inner peripheral edge 21a of the same portion is formed in the middle of the inner peripheral edge 21a. A recess 21b for engaging the lock portion 25a is formed at a predetermined position. Therefore, when the lens barrel 1 is rotated counterclockwise while in close contact with the lens mount 21, the lock portion 25a resists the elastic force of the spring 26 and locks the partial inner circumferential edge 2.
1a while moving in the direction of the arrow A along the inner peripheral edge 21a, at this time the elastic force of the spring 26 is further stored. When the lock portion 25a reaches the recess 21b, the lock portion 25a is fitted into the recess 21b due to the elastic force stored in the spring 26. It will be locked at the rotation angle position.

When the lens barrel 1 is attached to the lens mount 21 in this way, the lens attachment/detachment button 2
Since the lock portion 25a of the lens mount 21 moves toward the optical axis O along a part of the inner circumferential edge 21a of the lens mount 21, during that time, the lens mounting state detection switch 9 is moved from both the contact pieces 9a, 9b
The space is spaced apart and it is in an open state. Further, when the lock portion 25a is fitted into the recess 21b and is completely locked, at this time the detection switch 9
Both contact pieces 9a and 9b come into contact with each other, resulting in a closed state.
In addition, in this locked state, naturally, the electrical contacts 10 to 13 on the lens barrel 1 side and the electrical contacts 14 to 17 on the camera 5 side shown in FIG. It will be connected.

When removing the lens barrel 1 from the camera 5, press down the lens attachment/detachment button 25.
Since the lock portion 25a exits from the recess 21b, the lens barrel 1 is rotated clockwise. When the lens barrel 1 is rotated to the positioning point at which it was first mounted, the mounting by the bayonet mechanism (not shown) is removed, so that the lens barrel 1 can be separated from the lens mount 21 at this time.

Returning to FIG. 1 again, the circuit configuration on the camera 5 side will be described. The other end of the analog switch 6 is connected to the aperture control circuit 30, and the other end of the analog switch 7 is connected to the aperture information detection circuit 31 via the aperture information detection circuit 31. The analog switch 8 is connected to a warning circuit 18 and a mode selection circuit 20, and is also connected to an arithmetic circuit 33 via an aperture information input circuit 32, which is a photographing information input means, and the other end of the analog switch 8 is connected to a distance information detection circuit 34. It is connected to the above-mentioned warning circuit 18 and mode selection circuit 20 via a distance information input circuit 35, which is a photographing information input means, and to an arithmetic circuit 36. The film sensitivity setting circuit 37 is connected to the arithmetic circuit 33 and another arithmetic circuit 38, respectively. Further, the aperture information input circuit 32 is connected to the aperture control circuit 30.
and an aperture value display circuit 39, respectively. The finder photometric circuit 40 is connected to each of the arithmetic circuits 33, 38, and 36 via a memory circuit 41, respectively. The shutter time setting circuit 42 is connected to the arithmetic operation circuit 38, the shutter time display circuit 43, and the shutter control circuit 44, respectively. The arithmetic circuit 33 is connected to the shutter seconds display circuit 43, and the arithmetic circuit 38 is connected to the aperture value display circuit 39.
The arithmetic circuit 36 is connected to the aperture control circuit 30 and the aperture value display circuit 39, respectively. Further, the mode selection circuit 20 connected to the shutter priority side contact SA, the aperture priority side contact FA, and the manual side contact M of the mode changeover switch 19 includes the shutter seconds display circuit 43, the aperture control circuit 30, The aperture value display circuit 39, the shutter control circuit 44, and the light emission amount control circuit 45 are connected to each other. The film surface photometry circuit 46 is connected to the shutter control circuit 44 and the light emission amount control circuit 45, respectively.
The light emission amount control circuit 45 is connected to the flash circuit 47 of the strobe mounted on the camera 5, and the flash circuit 47 is connected to the arithmetic circuit 36, and also via the flash F synchronization time delay circuit 48. They are connected to a shutter second display circuit 43 and a shutter control circuit 44, respectively.

Next, the operation of the photographing lens information transmission device configured as described above will be described. When the lens barrel 1 is mounted on the lens mount 21 of the camera 5 and the lens barrel 1 is locked in a predetermined position on the lens mount 21 as described above, the electrical contact 1 on the lens barrel 1 side
0 to 13 are electrical contacts 14 on the camera 5 side, respectively.
17, and at the same time, the lens attachment state detection switch 9 is closed. This detection switch 9
is closed, analog switches 6 to 6 are closed.
8 are turned on, the resistance values of the variable resistors 2 to 4 on the lens barrel 1 side, that is, photographing information, are introduced to the photographing control circuit on the camera 5 side through the analog switches 6 to 8. The aperture operation information of the variable resistor 2 is sent to the aperture control circuit 30 through the analog switch 6.
The aperture setting information of the variable resistor 3 is led to the aperture information input circuit 32 and the aperture information detection circuit 31 through the analog switch 7, and the distance setting information of the variable resistor 4 is further led to the distance information detection circuit through the analog switch 8. 34 and a distance information input circuit 35.

Here, if the mode changeover switch 19 is now connected to the contact SA on the shutter priority side, the mode selection circuit 20 selects the auto mode with shutter priority. When the shutter priority mode is selected by the mode selection circuit 20, the output of the film sensitivity setting circuit 37, the output of the finder photometry circuit 40 from the memory circuit 41, and the shutter speed setting circuit 4
The aperture value display circuit 39 displays the appropriate aperture value. Then, when the shutter release causes the aperture control circuit 30 to receive aperture operation information through the analog switch 6, this aperture operation information and the output of the arithmetic circuit 38, which has been introduced to the aperture value display circuit 39, The control circuit 30 compares the information, and the aperture is controlled so that the aperture operation information matches the output of the arithmetic circuit 38. At this time, the shutter is controlled by the shutter control circuit 44 by introducing the output of the shutter time setting circuit 42 to the shutter control circuit 44.

Further, when the mode changeover switch 19 is connected to the contact FA on the aperture priority side, the mode selection circuit 20 selects the aperture priority auto mode. When the aperture priority mode is selected by the mode selection circuit 20, the output of the film sensitivity setting circuit 37 and the finder photometry circuit 40 from the memory circuit 41 are
The aperture setting information set by the variable resistor 3 obtained through the aperture information input circuit 32 is calculated by the arithmetic circuit 33, and the appropriate shutter time is displayed by the shutter time display circuit 43. Then, by the shutter release, the aperture control circuit 3
When the aperture operation information is derived to 0, this aperture operation information and the aperture setting information from the aperture information input circuit 32 are compared in the aperture control circuit 30, and the aperture is adjusted so that the aperture operation information matches the aperture setting information. is controlled. At this time, the shutter is controlled by the shutter control circuit 44 by introducing the output of the film surface photometry circuit 46 to the shutter control circuit 44 after the stop-down operation is completed.

Further, when the mode changeover switch 19 is connected to the manual side contact M, the mode selection circuit 20 selects the manual mode. When the manual mode is selected and the aperture is set, the aperture information set at this time is led to the arithmetic circuit 33 from the aperture information input circuit 32, and the appropriate shutter time is displayed in the shutter time display circuit 43. When the shutter time is set, the shutter time information set at this time is led from the shutter time setting circuit 42 to the arithmetic circuit 38, and the appropriate aperture value is displayed on the aperture value display circuit 39. Ru. Therefore, manual photography is performed by setting the shutter speed and aperture value that are respectively displayed.

Furthermore, when a strobe is attached to the camera 5, the flash circuit 47 is connected, so in the shutter priority mode, the shutter time becomes the F synchronization time, and the light emission amount control circuit 45
The strobe will fire at maximum light intensity. At this time, the aperture is set by the maximum guide number from the flash circuit 47, the output of the arithmetic circuit 36 determined by the output of the distance information input circuit 35, and the output of the finder photometry circuit 40. In addition, in the aperture priority mode, the aperture is set to a manually set value, the shutter speed is set to F-tuned speed, and the amount of emitted light is controlled by the output of the film surface photometry circuit 46. Furthermore, in the manual mode, the strobe emits light at the maximum amount depending on the set aperture or shutter speed.

The above operation occurs when the lens barrel 1 is attached to the camera 5 at a predetermined position and is completely locked.

By the way, even if the lens barrel 1 is attached to the lens mount 21 of the camera 5, the lens barrel 1 is attached to the lens mount 21.
In some cases, the device may not be rotated to a predetermined locking position relative to the device 1, resulting in incomplete installation.

In such a case, the warning circuit 18 is activated and the warning device according to the present invention is activated. That is, the electrical contacts 10 to 13 on the lens barrel 1 side are not connected to the electrical contacts 14 to 17 on the camera 5 side in an accurate manner, and the electrical contacts for the corresponding photographing information are cut off. Alternatively, two electrical contacts become connected with different photographic information. Then, the lens attachment state detection switch 9 is opened, so that when the detection switch 9 is opened, the analog switches 6 to 8 are all turned off, and the lens barrel 1 side is turned off. The photographing information of the variable resistors 2 to 4 is not transmitted to the camera 5 side. Therefore, at this time, the warning circuit 18 is activated by the outputs of the aperture information detection circuit 31 and the distance information detection circuit 34, and the lens barrel 1 of the photographic lens is moved to the camera 5.
An alarm notifies the photographer that aperture control cannot be performed because the lens is not completely attached to the camera. When the warning circuit 18 is activated, the output from the aperture information detection circuit 31 and the distance information detection circuit 34 causes the mode selection circuit 20 to
At this time, for example, if the mode changeover switch 19 is switched to the contact SA on the shutter priority mode side, an aperture priority mode other than the same mode is selected. The aperture setting information is then led to the arithmetic circuit 33 through the aperture information input circuit 32 as the minimum aperture value, so that exposure control is performed at a shutter speed corresponding to this minimum aperture value. The same applies to the case of flash photography, and the amount of light emitted at this time is controlled by the output of the film surface photometry circuit 46 or becomes the maximum amount of light emitted. In this case as well, since the aperture is not controlled, the warning circuit 18 issues a warning.

Next, a case where a lens barrel other than the lens barrel 1 is attached to the camera 5 will be described. That is, instead of transmitting aperture information etc. as an electrical signal to the camera 5 side as in the lens barrel 1 described above, the set aperture information is transmitted to, for example, an aperture stage number member linked to an aperture ring, as is generally used in the past. Therefore, when a lens barrel configured to mechanically transmit information to the camera is attached to the camera 5, a normal lens barrel is provided with a lens mounting state detection switch 9 that cooperates with the lens attachment/detachment button 25. Therefore, analog switches 6 to 8 are turned off. Therefore, in this case as well, the warning circuit 18 is activated by the outputs of the aperture information detection circuit 31 and the distance information detection circuit 34, and at the same time, the mode switching device is activated. In other words, if the mode selector switch 19 is connected to contact SA on the shutter priority side,
The mode selection circuit 20 selects the aperture priority mode. When the aperture information is mechanically transmitted to the camera 5 by the aperture stage number member that is linked to the rotation of the aperture ring of the lens barrel, this aperture information is converted into an electrical signal by the aperture information input circuit 32. Therefore, an appropriate shutter speed is displayed based on the aperture information from the aperture information input circuit 32, and at the same time, exposure control is performed using the same shutter speed.

In the above embodiment, the analog switches 6 to 8 are provided on the camera 5 side, but they may be provided on the lens barrel 1 side.

[Effect of the invention] As described above, according to the invention, if the lens barrel is not installed in the correct position, the contact point as a connection means and the camera body are electrically disconnected. It is possible to prevent an adverse effect on the input means, and also to display a warning to notify the user that the lens barrel is not properly attached.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a camera warning device showing an embodiment of the present invention, FIG. 2 is a front view showing the mounting surface of a camera and lens barrel to which the warning device of FIG. FIG. 3 is a perspective view of the lens attachment state detection switch shown in FIG. 2 above. 1... Lens barrel, 2, 3, 4... Variable resistor (shooting information output means), 5... Camera body, 6, 7, 8...
...Analog switch (second switch means), 9...
... Lens attachment state detection switch (first switch means), 10 to 17 ... Electrical contact (connection means), 1
9...Mode selection switch, 20...Mode selection circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A photographic information output means provided on the lens barrel of a photographic lens; When the lens barrel is attached to a camera body, the photographic information output means is used as a photographing information input means of the camera body and a photographing information input means of the camera body. a connecting means electrically connected to the information detecting means; a first switch means activated depending on whether the lens barrel is properly attached to the camera body; and a connecting means connected to the photographing information input means and the photographing information detecting means. a second switch means interposed between the first switch means and the second switch means for transmitting the photographing information to the photographing information input means and the photographing information detecting means when the first switch means is activated and not to transmit the photographing information when the first switch means is not activated; a warning means connected to the photographing information detection means and activated when the photographing information detection means detects a non-transfer state of the photographing information; and when the lens barrel is not properly attached to the camera body, the connecting means and the photographing information A warning device for a camera, characterized in that the input means and the photographic information detecting means are electrically disconnected, and a warning is displayed based on the output of the photographing information detecting means.