JPH095850A - Camera - Google Patents

Abstract

PURPOSE: To provide a camera which never malfunctions even if static electricity is applied in a state where a photographic lens is not attached, in a photographic lens interchangeable camera. CONSTITUTION: The camera provided with a lens mount part 2 to which the photographic lens 1 is detachably attached and an image pickup means 3 for picking up the image of an object formed by the photographic lens 1 is constituted to provide a lens detecting means 4 detecting the fact that the photographic lens 1 is attached to the lens mount part, 2 or not and a first power source interrupting means 5 for stopping the supply of power to the image pickup means 3, when the attachment of the lens 1 is not detected by the lens detecting means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an interchangeable photographing lens, and particularly, depending on the mounting condition of the photographing lens,
The present invention relates to a camera that cuts off the power supply inside the camera or the communication of the lens mount section.

[0002]

2. Description of the Related Art Generally, in a camera with interchangeable lenses, the angle of view of a subject image and the depth of field can be freely changed by mounting taking lenses having different focal lengths and open F-numbers. it can. By appropriately performing such lens exchange according to the shooting intention, it is possible to shoot with rich expression.

FIG. 12 is a diagram showing a lens mount portion of this type of camera. In the figure, a camera body 21 is provided with a lens mount portion 22 having an engagement mechanism for surely and quickly attaching and detaching a taking lens. The lens mount portion 22 is provided with a contact 28 that comes into contact with a contact on the side of the taking lens, and power supply and communication to the taking lens are performed via the contact 28.

[0004]

By the way, when the photographing lens is not attached to the lens mount portion 22,
Since the lens mount portion 22 is exposed to the outside, static electricity or the like from the outside may be applied to the contact point 28. Since the contact point 28 is connected to an electronic circuit inside the camera, when static electricity is applied to the contact point 28, there is a problem that internal electronic parts are damaged by application of a high voltage or the camera itself malfunctions.

In particular, a non-volatile memory in which control data and other data peculiar to the camera are stored in advance is provided inside the camera. However, once the data in the non-volatile memory is lost due to static electricity, the data is not restored and the camera itself. However, there was a problem that the control function of could not be recovered. Further, since a voltage is generated at the contact point 28 of the lens mount portion 22 even when the lens is not mounted, there is a problem that when the contact point 28 is short-circuited, a short-circuit current flows and the battery is wasted.

Further, if the release lens of the camera is accidentally cut off in the state where the taking lens is not mounted on the lens mount section 22, the taking is performed without forming the image of the subject, resulting in a mistake in taking a picture. there were. Claim 1
In order to solve such problems, the invention described in
It is an object of the present invention to provide a camera that does not malfunction even if static electricity is applied without the taking lens being attached.

It is an object of the present invention to provide a camera in which internal electric parts are not damaged even if static electricity is applied to the camera without the taking lens attached. It is an object of the present invention to provide a camera that does not malfunction even if static electricity is applied to the film without the taking lens attached, and that allows the film to be rewound or pre-wound at any time.

According to a fourth aspect of the present invention, there is provided a camera which does not malfunction even if static electricity is applied in a state where the taking lens is not attached and in which a memory card or other recording medium can be attached and detached at any time. To aim.

[0009]

FIG. 1 is a principle block diagram corresponding to the first aspect.

According to the first aspect of the present invention, there is provided a camera including a lens mount portion 2 to which the taking lens 1 is detachably mounted, and an image pickup means 3 for picking up a subject image formed by the taking lens 1. , A lens detecting unit 4 for detecting whether or not the photographing lens 1 is mounted on the lens mount unit 2. When the mounting of the photographing lens 1 is not detected by the lens detecting unit 4, the power supply to the image pickup unit 3 is cut off. It is characterized in that it is provided with a first power cutoff means 5 for

FIG. 2 is a principle block diagram corresponding to claim 2. The invention according to claim 2 is characterized in that a lens mount portion 2 to which the taking lens 1 is detachably mounted, an image pickup means 3 for picking up a subject image formed by the taking lens 1,
In a camera including a communication unit 6 that communicates with the taking lens 1 via the lens mount unit 2, a lens detecting unit 4 for detecting whether or not the taking lens 1 is mounted on the lens mount unit 2, and a lens detecting unit. It is characterized in that it is provided with a communication cutoff means 7 for cutting off the communication by the communication means 6 when the mounting of the taking lens 1 is not detected by the means 4.

FIG. 3 is a principle block diagram corresponding to claim 3. A third aspect of the present invention includes a lens mount portion 2 to which the taking lens 1 is detachably mounted, an exposing unit 9 that exposes a subject image formed by the taking lens 1 on the film 8, and a winding of the film 8. In a camera provided with a film feeding means 10 for rewinding or pre-winding, a lens detecting means 4 for detecting whether or not the taking lens 1 is mounted on the lens mount part 2 and the taking lens 1 by the lens detecting means 4. Is not detected,
A second power cutoff means 11 for cutting off the power supply to the exposure means 9 while supplying power to the film feeding means 10 is provided.

FIG. 4 is a principle block diagram corresponding to claim 4. According to a fourth aspect of the present invention, the lens mount 2 to which the taking lens 1 is detachably mounted, and the subject image formed by the taking lens 1 are converted into image information, and the image information is recorded on the recording medium 12. Image recording means 13 for recording
And a medium attaching / detaching means 14 for attaching / detaching the recording medium 12, a lens detecting means 4 for detecting whether or not the taking lens 1 is attached to the lens mount portion 2.
And a third power cutoff means 15 for cutting off the power supply to the image recording means 13 while supplying power to the medium attaching / detaching means 14 when the lens detecting means 4 does not detect the mounting of the taking lens 1. It is characterized by having.

[0014]

In the camera of claim 1, the lens detecting means 4 is
It is detected whether or not the taking lens 1 is mounted on the lens mount section 2. Here, when it is detected that the photographing lens 1 is not attached, the first power cutoff unit 5 cuts off the power supply to the image pickup unit 3.

Therefore, even if static electricity is applied with the lens mount portion 2 exposed, the image pickup means 3 does not operate and the camera does not malfunction. Further, even if the contact point of the lens mount unit 2 is short-circuited when the photographing lens 1 is not attached, the short-circuit current does not flow because the image pickup means 3 is not supplied with power, and the battery or the like is wasted. There is no.

Further, with the taking lens 1 not attached,
Even if the operator mistakenly releases the release, the image pickup means 3 does not operate, so that no photographing error occurs. In the camera of the second aspect, the lens detection unit 4 detects that the taking lens 1 is not attached. Here, when it is detected that the taking lens 1 is not attached, the communication cutoff unit 7 cuts off the communication by the communication unit 6.

Therefore, even if static electricity is applied to the contact for communication with the lens mount portion 2 exposed, the static electricity does not enter the inside of the camera and damage and malfunction of the inside of the camera can be prevented. Further, even if the communication contact of the lens mount unit 2 is short-circuited when the photographing lens 1 is not mounted, the communication is cut off by the communication cut-off means 7, so that the short-circuit current does not flow and the battery is wasted. Never be done.

In the camera of claim 3, the lens detecting means 4
Detects that the taking lens 1 is not attached. Here, when it is detected that the photographing lens 1 is not attached, the second power cutoff unit 1
1 cuts off the power supply to the exposure means 9. Therefore, even if static electricity is applied with the lens mount unit 2 exposed, the exposure unit 9 does not operate and the camera does not malfunction.

Further, even if the operator accidentally releases the release with the photographing lens 1 not mounted, the exposure means 9 does not operate, so that a photographing mistake does not occur. On the other hand, shooting lens 1
Since the power is supplied to the film feeding means 10 even when the film is not mounted, the film 8 can be rewound or pre-wound at any time via the film feeding means 10.

In the camera of claim 4, the lens detecting means 4
Detects that the taking lens 1 is not attached. Here, when it is detected that the photographing lens 1 is not attached, the third power cutoff unit 1
5 cuts off the power supply to the image recording means 13.

Therefore, even if static electricity is applied with the lens mount section 2 exposed, the image recording means 13 does not operate and the camera does not malfunction. In addition, even if the operator accidentally releases the release with the taking lens 1 not attached,
Since the image recording means 13 does not operate, no photographing error occurs. On the other hand, even when the taking lens 1 is not attached,
Since power is supplied to the medium attaching / detaching means 14, the recording medium 12 can be attached / detached via the medium attaching / detaching means 14 at any time.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is a diagram showing a first embodiment corresponding to claim 1. In FIG. 5, a camera body 21 is provided with a lens mount portion 22 to which a taking lens 23 is detachably mounted, and the lens mount portion 22 has a taking lens 23.
The contact 28 is arranged so as to come into contact with the side contact.

On the other hand, the power source 2 is provided inside the camera body 21.
4 is housed, and the anode side of the power supply 24 is connected to the power supply line 21a in the camera body 21 via the switch 25. The power supply line 21a has a microprocessor 2
6, power supply terminals such as the non-volatile memory 27, etc. are respectively connected, and further, a power supply line 23a in the photographing lens 23 is connected via a contact 28 of the lens mount portion 22.

The lens mount section 22 is provided with a lens detection section 30 for detecting "attachment of the photographing lens 23",
The output of the lens detector 30 is connected to the control terminal of the switch 25. Further, a shutter drive unit 31, an aperture drive unit 32, a film feeding unit 33, and the like are individually connected to each input / output terminal of the microprocessor 26, and an interrupt terminal of the microprocessor 26 is arranged on the camera body 21. The startup switch 34 is connected.

On the other hand, the communication terminal of the microprocessor 26 is connected to the non-volatile memory 27 inside the camera body 21, and further, via the contact point 28 of the lens mount portion 22, the communication terminal of the microprocessor 29 inside the taking lens 23. Connected to. FIG. 6 is a diagram illustrating an example of the lens detection unit 30. In FIG. 6, the lens mount portion 22 is provided with a protrusion 35 that is pressed by the “mounting of the taking lens 23”, and a push switch 36 is disposed behind the protrusion 35. One terminal of the push switch 36 is grounded, and the other terminal is the pull-up resistance element 37.
One terminal and the control terminal of the switch 25 are connected. The other terminal of the pull-up resistance element 37 is connected to the anode side of the power supply 24.

Regarding the correspondence between the invention according to claim 1 and the first embodiment, the lens mount portion 2 corresponds to the lens mount portion 22, the image pickup means 3 is the microprocessor 26, and the shutter drive portion 31. , The diaphragm drive unit 32, the film feeding unit 33, the lens detection unit 4 corresponds to the lens detection unit 30, and the first power cutoff unit 5 corresponds to the switch 25.

The operation of the first embodiment will be described below with reference to FIGS. First, when the taking lens 23 is mounted on the lens mount 22, the projection 35 is pressed and the push switch 36 is turned on. The push switch 36 lowers the voltage of the control terminal of the switch 25 to the ground voltage, and the switch 25 becomes conductive.

When the switch 25 is turned on in this manner, the anode side of the power source 24 is connected to the power source line 21 in the camera body 21.
It is connected to a and supplies power to the microprocessor 26 and the like. On the other hand, when the taking lens 23 is not attached, the protrusion 35 of the lens mount 22 is not pressed and the push switch 36 is turned off.

Therefore, the voltage of the control terminal of the switch 25 is raised via the pull-up resistance element 37, and the switch 25 is cut off. When the switch 25 is thus cut off, the power supply by the power supply line 21a is cut off. As described above, in the first embodiment, the lens detection unit 30
Detects that the photographic lens 23 is not attached, and the power supply to the camera body 21 is cut off. Therefore, even if static electricity is applied from the outside with the lens mount portion 22 exposed, the inside of the camera body 21 does not operate at all. . Therefore, malfunction due to static electricity can be reliably prevented.

Also, with the taking lens 23 not attached,
Even if the contact point 28 of the lens mount portion 22 is short-circuited, the power supply is cut off, so that no short-circuit current flows and the power supply 24 can be prevented from being consumed. Further, even if the operator accidentally releases the release with the taking lens 23 not attached, the inside of the camera body 21 does not operate, so that it is possible to accurately prevent the taking mistake.

Next, another embodiment will be described. Figure 7
[FIG. 8] is a diagram showing a second embodiment corresponding to claim 2.
Regarding the structural features of the second embodiment, the power source 24
The anode side of is connected to the power supply line 21a, and the power supply line 2
1a is connected to a power supply line 23a in the taking lens 23 via a switch 41a and a contact 28.

The communication terminal of the microprocessor 26 has a nonvolatile memory 27 and switches 41b to 41d.
The other terminals of the switches 41b to 41d are connected to one terminal of the microprocessor 29 via the contact 28.
Connected to the communication terminal. The same components as those shown in FIG. 5 are designated by the same reference numerals,
The description here is omitted.

Regarding the correspondence between the invention according to claim 2 and the second embodiment, the lens mount portion 2 corresponds to the lens mount portion 22, the image pickup means 3 is the microprocessor 26, and the shutter drive portion 31. , The diaphragm drive unit 32, the film feeding unit 33, the lens detection unit 4 corresponds to the lens detection unit 30, the communication unit 6 corresponds to the communication function of the microprocessor 26, and the communication cutoff unit 7 corresponds to the switch 4.
1b to 41d.

The operation of the second embodiment will be described below with reference to FIG. First, the lens detection unit 30 sets the taking lens 23
When the mounting of the switch is detected, the switches 41a to 41d are made conductive. Here, when the switch 41a is turned on, power is supplied from the camera body 21 side to the power line 23a inside the taking lens 23.

When the switches 41b to 41d are turned on, a communication path is formed between the microprocessor 26 and the contact 28, and communication with the taking lens 23 is performed. On the other hand, when the taking lens 23 is not attached, the lens detection unit 30 detects that the taking lens 23 is not attached,
The switches 41a to 41d are cut off.

When the switch 41a is cut off, the power supply to the taking lens 23 is cut off. Further, by disconnecting the switches 41b to 41d, the communication path between the microprocessor 26 and the contact 28 is disconnected. As described above, in the second embodiment, it is detected that the taking lens 23 is not attached and the microprocessor 26
Since the communication path between the contact 28 and the contact 28 is blocked, even if static electricity is applied to the contact 28 with the lens mount 22 exposed, the static electricity does not enter the inside of the camera body 21 and the inside of the camera body 21 is damaged. In addition, it is possible to reliably prevent malfunction.

Further, even if the contact 28 is short-circuited when the taking lens 23 is not attached, the short-circuit current does not flow because the switches 41a to 41d are cut off, and the power supply 24 can be prevented from being consumed. Further, since the connection between the contact 28 and the non-volatile memory 27 is also cut off, even if static electricity is applied to the contact 28, the stored contents of the non-volatile memory are not erased.

Next, another embodiment will be described. FIG.
FIG. 8 is a diagram showing a third embodiment corresponding to claim 3;
Regarding the structural feature of the third embodiment, a rewinding switch 42 for activating film rewinding is provided in the camera body 21. This rewind switch 4
2 is grounded and the other terminal is switch 25
Is connected to the control terminal and the microprocessor 26.

The same components as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted here. Regarding the correspondence relationship between the invention according to claim 3 and the third embodiment, the lens mount portion 2 corresponds to the lens mount portion 22, the lens detecting means 4 corresponds to the lens detecting portion 30, and the exposing means. 9 corresponds to the microprocessor 26, the shutter drive unit 31, and the diaphragm drive unit 32,
The film feeding unit 10 corresponds to the film feeding unit 33 and the rewind switch 42, and the second power cutoff unit 11 corresponds to the switch 25.

The operation of the third embodiment will be described below with reference to FIG. First, when the photographing lens 23 is mounted on the lens mount unit 22, the switch 25 is turned on by the lens detection unit 30. Then, the anode side of the power supply 24 is connected to the power supply line 21a in the camera body 21, and power is supplied to the microprocessor 26 and the like.

On the other hand, when the taking lens 23 is not attached, the switch 25 is cut off by the lens detecting section 30,
The power supply to the power supply line 21a is cut off. Further, when the rewinding switch 42 is turned on with the taking lens 23 not attached, the voltage of the control terminal of the switch 25 is lowered and the switch 25 is turned on.

By driving the film feeding unit 33 in this state, the film can be rewound.
As described above, in the third embodiment, since the power supply in the camera body 21 is shut off by detecting the non-mounting of the taking lens 23, even if static electricity is applied from the outside with the lens mount portion 22 exposed. Since the inside of the camera body 21 does not operate at all, malfunction due to static electricity can be reliably prevented.

Further, with the taking lens 23 not attached,
Even if the operator accidentally releases the release, the camera body 21
Since does not work, it is possible to accurately prevent shooting mistakes. On the other hand, even when the taking lens 23 is not attached, the film rewinding switch 42 is turned on to supply power to the film feeding unit 33, so that the film can be rewound at any time.

Therefore, the film can be rewound at any time regardless of the mounting state of the taking lens 23. Next, another embodiment will be described. FIG. 9 is a diagram showing a fourth embodiment corresponding to the third aspect. Regarding the structural feature of the fourth embodiment, the anode side of the power supply 24 is
One of the terminals of the switch 25 and the switch 44 is connected to each other, and the other terminal of the switch 25 is connected to the switch 4
5 to the power supply line 21a. Switch 4
The other terminal of 4 is also connected to the power supply line 21a.

Further, one terminal of the starting switch 34 is grounded and the other terminal is connected to the control terminal of the switch 45. One terminal of the rewind switch 42 is grounded,
The other terminal is connected to the control terminal of the switch 44. Regarding the same components as those shown in FIG. 5,
The same reference numerals are given and the description thereof is omitted.

Regarding the correspondence relationship between the invention according to claim 3 and the fourth embodiment, the lens mount portion 2 corresponds to the lens mount portion 22, and the lens detecting means 4 corresponds to the lens detecting portion 30. The exposure unit 9 corresponds to the microprocessor 26, the shutter drive unit 31, and the aperture drive unit 32,
The film feeding unit 10 corresponds to the film feeding unit 33 and the rewinding switch 42, and the second power cutoff unit 11 corresponds to the switch 25 and the switch 44.

The operation of the fourth embodiment will be described below with reference to FIG. First, when the photographing lens 23 is mounted on the lens mount unit 22, the switch 25 is turned on by the lens detection unit 30. Here, when the operator turns on the activation switch 34, the switch 45 becomes conductive, and power is supplied to the microprocessor 26 and the like via the power supply line 21a.

On the other hand, when the taking lens 23 is not attached, the switch 25 is cut off by the lens detecting section 30,
The power supply from the power supply line 21a is cut off. Also,
When the rewind switch 42 is turned on in a state where the taking lens 23 is not attached, the switch 44 is turned on to supply power to the microprocessor 26 and the like.

In this state, the film feeding unit 33 is driven to rewind the film. As described above, in the fourth embodiment, it is possible to obtain the same effect as that of the third embodiment described above.

Next, another embodiment will be described. FIG.
0 is a diagram showing a fifth embodiment corresponding to claim 4. As for the structural features of the fifth embodiment, the power source 24
The anode side of is connected to one terminal of each of the switch 25 and the switch 44, and the other terminal of the switch 25 is connected to the power supply line 21 a via the switch 45. The other terminal of the switch 44 is also connected to the power supply line 21a.

One terminal of the starting switch 34 is grounded, and the other terminal is connected to the control terminal of the switch 45. One terminal of the medium attaching / detaching switch 54 is grounded, and the other terminal is connected to the control terminal of the switch 44. Further, each input / output terminal of the microprocessor 26 has a CC
The D drive unit 51, the image recording unit 52, the medium attaching / detaching unit 53, and the like are individually connected.

The same components as those shown in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. Regarding the correspondence relationship between the invention according to claim 4 and the fifth embodiment, the lens mount portion 2 corresponds to the lens mount portion 22, the lens detecting means 4 corresponds to the lens detecting portion 30, and the image recording is performed. The means 13 corresponds to the microprocessor 26, the CCD drive section 51, and the image recording section 52, the medium attachment / detachment section 14 corresponds to the medium attachment / detachment section 53 and the medium attachment / detachment switch 54, and the third power cutoff section 15 is the switch 25 and the switch. Corresponding to 44.

The operation of the fifth embodiment will be described below with reference to FIG. First, when the taking lens 23 is mounted on the lens mount section 22, the switch 25 is turned on by the lens detecting section 30. Here, the operator selects the start switch 3
When the switch 4 is turned on, the switch 45 is turned on, and power is supplied to the microprocessor 26 and the like via the power supply line 21a.

On the other hand, when the taking lens 23 is not attached, the switch 25 is cut off by the lens detecting section 30,
The power supply from the power supply line 21a is cut off. Also,
When the medium attachment / detachment switch 54 is turned on in a state where the taking lens 23 is not attached, the switch 44 is turned on to supply power to the microprocessor 26 and the like.

By driving the medium attaching / detaching portion 53 in this state, a memory card or other recording medium is attached / detached. As described above, in the fourth embodiment, the taking lens 23
Since the power supply to the power supply line 21a is shut off by detecting that the lens mount section 22 is not attached, even if static electricity is externally applied with the lens mount section 22 exposed, the image recording section 52 and the like do not operate, and the camera The malfunction of can be reliably prevented.

Further, with the taking lens 23 not attached,
Even if the operator mistakenly releases the release, the image recording unit 52 and the like do not operate, so that it is possible to accurately prevent a photographing error. On the other hand, even when the taking lens 23 is not attached, the power is supplied to the power supply line 21a by turning on the medium attaching / detaching switch 54, so that the recording medium can be attached / detached at any time.

In the first embodiment, the lens detector 3
Although the protrusion 35, the push switch 36, and other mechanisms shown in FIG. 6 are provided on the lens mount 22 as 0, the present invention is not limited to this configuration. For example, the mounting of the taking lens 23 may be detected from the tilted state of the diaphragm drive lever arranged on the lens mount unit 22. Also,
The mounting of the taking lens 23 may be detected from the current flowing between the taking lens 23 and the contact 28. Further, the mounting of the taking lens 23 may be detected by determining whether or not the communication with the taking lens 23 can be performed via the contact point 28.

Further, in the third and fourth embodiments, the camera body 21 is limited to the period during which the film is rewound.
Although power is supplied to the whole, the present invention is not limited to this configuration. For example, a dedicated power supply line may be separately provided for the film rewinding mechanism, and power may be constantly supplied to this power supply line. Further, although the third and fourth embodiments are applied to the camera that rewinds the film, the present invention is not limited to this and may be applied to a camera that prewinds the film.

Further, in the above-mentioned embodiment, the switch 25
Alternatively, either one of the switches 41a to 41d is provided, but as in the sixth embodiment shown in FIG. 11, both of these switches are provided and the power supply is cut off when the taking lens 23 is not attached, And the communication path may be blocked.

[0060]

As described above, according to the first aspect of the invention, the power supply to the image pickup means is cut off when the non-mounting of the photographing lens is detected, so that the lens mount portion is exposed from the outside. Even if static electricity is applied, the image pickup means does not operate, and the malfunction of the camera can be reliably prevented.

Further, even if the contact of the lens mount is short-circuited when the photographing lens is not mounted, no current flows because the image pickup means is not supplied with power, and battery consumption can be largely prevented. it can. Further, even if the operator accidentally releases the release with the photographic lens not attached, the image pickup means does not operate, so that it is possible to accurately prevent erroneous photography.

According to the second aspect of the present invention, the communication of the communication means is interrupted when the non-mounting of the photographing lens is detected. Therefore, even if static electricity is applied to the communication contact with the lens mount portion exposed, the camera Static electricity does not enter inside, and it is possible to reliably prevent damage and malfunctions inside the camera.

Further, even if the communication contact of the lens mount is short-circuited when the photographing lens is not mounted, the communication is cut off by the communication cut-off means, so that the current does not flow and the battery consumption is drastically reduced. Can be prevented. According to the third aspect of the present invention, when it is detected that the photographing lens is not attached, the power supply to the exposure means is shut off. Therefore, even when static electricity is applied from the outside with the lens mount portion exposed, the exposure means operates. The malfunction of the camera can be reliably prevented.

Further, even if the operator accidentally releases the release with the photographic lens not attached, the exposure means does not operate, so that the photographic error can be properly prevented. on the other hand,
Since the power is supplied to the film feeding means even when the taking lens is not mounted, the film can be rewound or pre-wound at any time. Therefore, the durability of the camera against static electricity and the like can be improved without impairing the operability such as film exchange.

According to the fourth aspect of the present invention, the power supply to the image recording means is cut off when it is detected that the photographing lens is not attached. Therefore, even if static electricity is applied from the outside with the lens mount portion exposed, the image The recording unit does not operate, and the malfunction of the camera can be reliably prevented. Further, even if the operator accidentally releases the release with the photographic lens not attached, the image recording means does not operate, so that it is possible to properly prevent erroneous photography.

On the other hand, even when the taking lens is not attached, the medium attaching / detaching means is supplied with power, so that the recording medium can be attached / detached at any time. As described above, in the camera to which the present invention is applied, the durability of the camera against static electricity and the like is significantly improved even when the taking lens is not attached. Therefore, the camera can be used safely and reliably even in an environment where static electricity is easily generated.

[Brief description of drawings]

1 is a principle block diagram corresponding to claim 1. FIG.

FIG. 2 is a principle block diagram corresponding to claim 2;

FIG. 3 is a principle block diagram corresponding to claim 3;

FIG. 4 is a principle block diagram corresponding to claim 4;

FIG. 5 is a diagram showing a first embodiment corresponding to claim 1;

FIG. 6 is a diagram showing an example of a lens detection unit 30.

FIG. 7 is a diagram showing a second embodiment corresponding to claim 2;

FIG. 8 is a diagram showing a third embodiment corresponding to claim 3;

FIG. 9 is a diagram showing a fourth embodiment corresponding to claim 3;

FIG. 10 is a diagram showing a fifth embodiment corresponding to claim 4;

FIG. 11 is a diagram showing a sixth embodiment corresponding to claims 1 to 3.

FIG. 12 is a diagram showing a lens mount portion of a camera.

[Explanation of symbols]

 1, 23 Photographing lens 2, 22 Lens mount section 3 Imaging means 4 Lens detecting means 5 First power cutoff means 6 Communication means 7 Communication cutoff means 8 Film 9 Exposure means 10 Film feeding means 11 Second power cutoff means 12 Recording medium 13 Image recording means 14 Medium attaching / detaching means 15 Third power cutoff means 21 Camera body 21a, 23a Power supply line 24 Power supply 25, 44, 45 Switch 26, 29 Microprocessor 27 Nonvolatile memory 28 Contact point 30 Lens detection section 31 Shutter Drive unit 32 Aperture drive unit 33 Film feeding unit 34 Start switch 35 Protrusion 36 Push switch 37 Pull-up resistance element 42 Rewind switch 51 CCD drive unit 52 Image recording unit 53 Medium attaching / detaching unit 54 Medium attaching / detaching switch

Claims (4)

[Claims] 1. A camera comprising: a lens mount part to which a taking lens is detachably attached; and an image pickup means for picking up a subject image formed by the taking lens, wherein the taking lens has the taking lens. A lens detecting unit that detects whether or not the lens is attached; and a first power cutoff unit that shuts off power supply to the image pickup unit when the lens detecting unit does not detect attachment of the photographing lens. A camera characterized by that. 2. A lens mount part to which a taking lens is detachably mounted, an image pickup means for picking up a subject image formed by the taking lens, and communication with the taking lens via the lens mount part. In a camera provided with a communication unit, a lens detection unit that detects whether or not the photographing lens is mounted on the lens mount unit; and when the lens detection unit does not detect the mounting of the photographing lens, the communication is performed. A camera, comprising: a communication cutoff means for cutting off communication by the means. 3. A lens mount part to which a taking lens is detachably mounted, an exposing means for exposing a subject image formed by the taking lens onto a film, and a film supply for rewinding or pre-winding the film. In a camera including a feeding unit, a lens detection unit that detects whether or not the photographing lens is mounted on the lens mount unit; and when the lens detection unit does not detect the mounting of the photographing lens, the film A camera, comprising: a second power cutoff unit that cuts off power supply to the exposure unit while supplying power to the feeding unit. 4. A lens mount part to which a taking lens is detachably mounted, image recording means for converting a subject image formed by the taking lens into image information, and recording the image information on a recording medium. A camera provided with a medium attaching / detaching means for attaching / detaching the recording medium, wherein a lens detecting means for detecting whether or not the taking lens is attached to the lens mount part, and an attachment of the taking lens by the lens detecting means If no is detected, the camera is provided with a third power cutoff means for cutting off the power supply to the image recording means while supplying power to the medium attaching / detaching means.