JP2022173243A - camera body and lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera body that improves operability during use with a lens barrel attached thereto, the lens barrel capable of reducing its lens barrel length for storage.

SOLUTION: A camera body 130 can communicate with a lens barrel 101 having a storage state and a photographing state, and comprises: an imaging unit 201; a display unit 202; a communication unit that communicates with the lens barrel 101 and receives information indicating the storage state or the photographing state from the lens barrel 101; and an operation unit S2 that switches between a first state where electric power is supplied and a second state where electric power is not supplied. When the camera body is switched to the first state by the operation unit S2 and receives the information indicating the photographing state from the lens barrel 101, the imaging unit 201 can pick up a subject image, and the display unit 202 can display the subject image. When the camera body is switched to the first state by the operation unit S2 and receives the information indicating the storage state from the lens barrel 101, the imaging unit 201 cannot pick up the subject image, and the display unit 202 performs display indicating the storage state.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to camera bodies and lens barrels.

Conventionally, by operating the zooming operation member out of the zooming operation range, the lens is moved along the optical axis direction toward the mount side, thereby shortening the overall length of the lens barrel (hereinafter referred to as the lens barrel length). There is known a lens barrel with a lens barrel (see, for example, Patent Document 1).

JP-A-2-25815

In a camera equipped with a lens barrel that can be stored by shortening the length of the lens barrel as described above, it is necessary to shorten the length of the lens barrel to change from the state of use when the power is on to the state of non-use. After shortening the length, the power of the camera body is turned off, which poses a problem of poor operability.

The present invention provides a camera body capable of communicating with a lens barrel having a retracted state and a photographing state, comprising an imaging unit for capturing an image of a subject, a display unit for displaying the subject image, and communication with the lens barrel. a communication unit that receives information indicating the retracted state or the photographing state from the lens barrel; a first state in which power is supplied from the power supply unit; a second state in which power is not supplied from the power supply unit; and an operation unit for switching between, when the operation unit is switched to the first state and information indicating the shooting state is received from the lens barrel, the imaging unit is capable of imaging the subject image, The display unit can display the subject image, and when the operation unit is switched to the first state and information indicating the retracted state is received from the lens barrel, the imaging unit captures the subject image. The display section relates to a camera body that displays the stored state.
The present invention also relates to a lens barrel detachable from the camera body.

According to the present invention, it is possible to provide a camera body and a lens barrel with improved operability when using a lens barrel that can be stored by shortening the length of the barrel.

1 is a schematic cross-sectional view showing a camera system of a first embodiment; FIG. 1 is a circuit diagram showing the configuration of a camera system according to a first embodiment; FIG. FIG. 4 is an explanatory diagram showing a combination of the states of two switches and the power state of the camera system according to the first embodiment; FIG. 10 is a circuit diagram showing the configuration of a camera system according to a second embodiment; FIG. 10 is a flowchart showing a processing procedure by the power supply control unit from a state in which power supply from the power supply unit is cut off to the start of power supply in the second embodiment; 10 is a flowchart showing a processing procedure by a power control unit from a state where power is being supplied by the power source until the power supply is cut off in the second embodiment.

An embodiment in which a camera body and a lens barrel according to the present invention are applied to a digital camera will be described below with reference to the drawings. In the description of FIG. 1, the object side (the left side in the drawing) is called the front side, and the liquid crystal monitor 202 side (the right side in the drawing) is called the rear side.
(First embodiment)

FIG. 1 is a schematic cross-sectional view showing the camera system of the first embodiment. The camera system 100 includes a lens barrel 101 that movably holds an optical system, and a camera body 130 as an imaging device. The camera system 100 is a lens-interchangeable digital camera, and a lens barrel 101 is detachably attached to a camera body 130 .

First, the lens barrel 101 will be described. In FIG. 1, the upper half of the optical axis A shows a cross-sectional view of the lens barrel 101 with its barrel length shortened and stored (hereinafter referred to as a stored state), and the lower half shows a cross-section of the photographing state. Figure shows. In the photographing state shown in FIG. 1, an optical system consisting of a front lens group L1 and a rear lens group L2, which will be described later, and an imaging unit 201, which will be described later, are arranged with a first gap in the direction of the optical axis A. . In the housed state shown in FIG. 1, the distance between the optical system including the front lens group L1 and the rear lens group L2 and the imaging unit 201 is a second distance narrower than the first distance. Become.

As shown in FIG. 1, the lens barrel 101 includes a mount barrel 110, a fixed barrel 106 fixed to the mount barrel 110, a cam ring 107 arranged on the outer peripheral portion of the fixed barrel 106, a lens group holding frame 105, and a zoom operation. It includes a ring 108, a front lens group chamber 103 arranged in the inner peripheral portion of the fixed cylinder 106, a rear lens group chamber 104, and the like. In FIG. 1, illustration of a diaphragm mechanism, an AF drive mechanism, a lens-side CPU, and the like in the lens barrel 101 is omitted.

In FIG. 1, when the user rotates the zoom operation ring 108, the zoom interlocking lever 109 fixed to the zoom operation ring 108 rotates, and the cam ring 107 fixed to the zoom interlocking lever 109 rotates. do. That is, the cam ring 107 rotates in conjunction with the zoom operation ring 108 . The cam ring 107 has an outer peripheral groove 107a formed around the optical axis A. As shown in FIG. In addition, the fixed cylinder 106 is provided with a claw portion 106a. The outer peripheral groove 107a of the cam ring 107 engages with the pawl portion 106a of the fixed barrel 106. As shown in FIG. Therefore, the cam ring 107 can rotate about the optical axis A while the position in the optical axis A direction is fixed with respect to the fixed cylinder 106 .

A lens group holding frame 105 holds the front group lens chamber 103 . Further, the lens group holding frame 105 has a cam pin 105a. The fixed cylinder 106 has a rectilinear groove (not shown), and the cam ring 107 has a cam groove 107b. The cam pin 105a of the lens group holding frame 105 engages with the rectilinear groove of the fixed barrel 106 and the cam groove 107b. Therefore, the cam ring 107 rotates around the optical axis A when the zoom operation ring 108 is rotated. When the cam ring 107 rotates, the cam pin 105a engaged with the cam groove 107b moves while being pushed by the cam groove 107b. The movement of the cam pin 105a around the optical axis A is restricted by the rectilinear groove of the fixed barrel 106, so that the cam pin 105a moves in the direction of the optical axis A along the rectilinear groove. Therefore, when the zoom operation ring 108 is rotated, the front lens group L1 held in the front lens chamber 103 moves in the optical axis A direction together with the lens group holding frame 105 having the cam pin 105a which moves in the optical axis A direction. move forward or backward along the In this manner, the lens barrel 101 is configured as a zoom lens that changes the focal length by rotating the zoom operation ring 108 .

The rear group lens chamber 104 holds a rear group lens L2 for focus adjustment. The rear group lens chamber 104 is driven forward or rearward in the direction of the optical axis A by an actuator (not shown). The rear lens group chamber 104 engages with a lead groove (not shown) provided in the front lens group chamber 103 . The lead groove is provided along the optical axis A direction. When the rear lens group chamber 104 is driven by the actuator, the rear lens group chamber 104 moves along the lead groove. This changes the distance of the rear lens group L2 with respect to the front lens group L1, thereby adjusting the focus of the subject image formed on the imaging unit 201, which will be described later.

The structure including the front lens group chamber 103, the rear lens group chamber 104, the lens group holding frame 105, the fixed barrel 106, the cam ring 107, the zoom operation ring 108, and the mount barrel 110 is the same as the front lens group L1 and the rear lens group. It functions as a space changing unit that changes the space between the optical system including the lens L2 and the imaging unit 201 to a second space narrower than the first space.

The fixed cylinder 106 also has a state detection switch S1. The state detection switch S1 is detection means for detecting that the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201 has reached the second distance. The state detection switch S1 is set at a position where the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201 corresponds to the first distance, as shown in the photographing state (lower half) of FIG. , the first state is assumed. That is, the state detection switch S1 is in a state in which the tip of the switch protrudes forward as indicated by the dashed line in FIG. Also, the state detection switch S1 is moved to a position where the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201 corresponds to the second distance, as shown in the upper half of FIG. When this occurs, it is displaced to a second state different from the first state. That is, the state detection switch S1 is in a state where the tip of the switch is pushed rearward by the rear end surface 105b of the lens group holding frame 105, as indicated by the solid line in FIG. The first state and second state of the state detection switch S1 will be described later.

The mount cylinder 110 has a plurality of bayonet claws 110a around the optical axis. In addition, the camera body 130 includes a plurality of bayonet claws 130a around the optical axis of the mount portion (reference numerals omitted). The lens barrel 101 can be fixed (mounted) to the camera body 130 by engaging the bayonet claw 110a on the lens barrel 101 side with the bayonet claw 130a on the camera body 130 side. The mount tube 110 also includes a plurality of lens-side electrical contacts 120 . The lens side electrical contact 120 has a lens contact 120a inserted therein. Each lens contact 120a is connected to a lens-side FPC (flexible printed circuit board) 121. FIG. The lens side FPC 121 is connected to the lens side CPU 111 which will be described later.

Next, the camera body 130 will be described. The camera body 130 has a plurality of camera-side electrical contacts 131 on the mount portion. The rear end of each camera-side electrical contact 131 is biased toward the lens barrel 101 by a conductive biasing spring 132 . The rear end of the biasing spring 132 is in contact with a conducting portion (not shown) formed on the surface of the camera-side FPC 133 . On the other hand, the back side of the camera-side FPC 133 is pressed by an FPC backing plate 134 . Therefore, the camera-side electrical contact 131 contacts the lens-side electrical contact 120 while being biased toward the lens-side electrical contact 120 . Also, the camera side FPC 133 is connected to the camera side CPU 200 . As a result, various signals and data are communicated between the lens-side CPU (not shown) and the camera-side CPU 200 . Although not shown in FIG. 1, electric power is also supplied from the camera body 130 to the lens barrel 101 via the electrical contacts described above.

The camera body 130 further includes an imaging unit 201, a liquid crystal monitor 202, a power status display lamp 203, and a power switch S2. The image capturing unit 201 includes an image sensor (not shown) that captures a subject image formed by the lens barrel 101 . A subject image captured by the imaging unit 201 is converted into an electrical image signal and then output to an image processing unit (not shown). The liquid crystal monitor 202 is display means for displaying a subject image (reproduced image, live view image, etc.) captured by the imaging unit 201, as well as information regarding shooting conditions and operations, setting information, and the like. A power status display lamp 203 is a lamp for notifying the user of the power status. The power status display lamp 203 lights when the power is on, and goes off when the power is off.

The power switch S2 is a slide switch for selectively switching power supply from a power supply unit 205 provided in the camera body 130, which will be described later. Power is supplied from the power supply unit 205 when the power switch S2 is switched to the ON position. On the other hand, when the power switch S2 is switched to the off (OFF) position, power is no longer supplied from the power supply unit 205 .

A mirror unit, a finder optical section, a photometry section, a distance measurement section, a shutter mechanism, and the like (not shown) are arranged inside the camera body 130 .

FIG. 2 is a circuit diagram showing the configuration of the camera system 100. As shown in FIG. In FIG. 2, parts equivalent to those in FIG. 1 are denoted by the same reference numerals. In FIG. 2, contacts A to D between the lens barrel 101 and the camera body 130 correspond to the contacts between the lens-side electrical contact 120 and the camera-side electrical contact 131 shown in FIG.

The state detection switch S1 of the lens barrel 101 is closed when the lens barrel 101 is in the retracted state shown in the upper half of FIG. In the photographing state shown in the lower half of FIG. 1, the switch contact is open and the switch is in a non-conducting state (hereinafter referred to as a first state). The lens-side CPU 111 is a circuit that controls an aperture mechanism (not shown) and an AF driving mechanism.

The camera main body 130 is connected to the camera side CPU 200, the DC-DC converter 204 and the power supply unit 205 via the power switch S2, the resistors R1 and R2 and the transistor Tr1.

The camera-side CPU 200 is a circuit that integrally controls the entire camera system 100, and is connected to the power supply section 205 via the DC-DC converter 204 and the transistor Tr1. In addition, the camera-side CPU 200 supplies signals necessary for the operation of the imaging unit 201 and the display control circuit 206 and also supplies power from the power supply unit 205 .

The power supply unit 205 is a power supply device that supplies power to the camera side CPU 200 and the lens side CPU 111 via the DC-DC converter 204 . While power is being supplied from the power supply unit 205 , the camera-side CPU 200 supplies an imaging control signal and power to the imaging unit 201 and supplies a lamp lighting signal and power to the display control circuit 206 . On the other hand, when the power supply unit 205 stops supplying power, the camera-side CPU 200 stops supplying signals and power necessary for the operation of the imaging unit 201 and the display control circuit 206 . That is, the power supply unit 205 functions as a power supply device that selectively supplies power to the imaging unit 201 .

The power supply unit 205 and the DC-DC converter 204 are connected by a transistor Tr1. The transistor Tr1 is a PNP transistor, and when a base current flows through the base (B), a current flows from the emitter (E) to the collector (C). That is, current from the power supply unit 205 is supplied to the DC-DC converter 204 . Further, when the base current stops flowing to the base (B), the current stops flowing from the emitter (E) to the collector (C). That is, the current supply from the power supply unit 205 to the DC-DC converter 204 is cut off. Current flow from the emitter (E) to the collector (C) of transistor Tr1 is controlled by the potential of the base (B). That is, if the potential of the base (B) is low, a base current flows through the base (B), so a current flows from the emitter (E) to the collector (C). If the potential of the base (B) is high, no base current flows through the base (B), so no current flows from the emitter (E) to the collector (C). The potential of the base (B) is controlled by the state of the state detection switch S1, as will be described later.

As described above, when the lens barrel 101 is retracted, the switch contact of the state detection switch S1 is closed and the state detection switch S1 is in a conducting state (second state). (first state). That is, the state detection switch S1 is in the second state when the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201 corresponds to the second distance narrower than the first distance. Thus, the first state is obtained when the distance between the optical system including the front lens group L1 and the rear lens group L2 and the imaging unit 201 corresponds to the first distance.

When the state detection switch S1 is in the second state, no base current flows through the base (B) of the transistor Tr1, so no current flows from the emitter (E) to the collector (C). Therefore, the supply of current from the power supply unit 205 to the DC-DC converter 204 is interrupted. On the other hand, when the state detection switch S1 is in the first state, a base current flows through the base (B) of the transistor Tr1, so a current flows from the emitter (E) to the collector (C). Therefore, current is supplied from the power supply unit 205 to the DC-DC converter 204 .

In FIG. 2, the circuit connected around the transistor Tr1 constitutes the cutoff means in this embodiment. This cut-off means is such that when the power supply unit 205 is supplying power to the imaging unit 201, the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201 is increased by the state detection switch S1. 2, that is, when the state detection switch S1 is in the second state, power supply from the power supply unit 205 is cut off. In addition, when the state detection switch S1 cuts off the power supply while the power supply unit 205 is supplying power, the state detection switch S1 is shifted from the second state to the first state. to restart power supply.

The power switch S2 of the camera body 130 is a switch that makes the base (B) of the transistor Tr1 and the power supply section 205 conductive or non-conductive. When the power switch S2 is switched to the ON position shown in FIG. 1, the switch contacts are opened to be in a non-conducting state, and when switched to the OFF position shown in FIG. 1, the switch contacts are closed to be in a conducting state.

The camera-side CPU 200 is also connected to the display control circuit 206 . The display control circuit 206 is a circuit that controls turning on/off of the power status display lamp 203 and screen display of the liquid crystal monitor 202 . The camera-side CPU 200 is turned on when power is supplied from the DC-DC converter 204 . While power is being supplied from the DC-DC converter 204 , the camera-side CPU 200 supplies a lamp lighting signal and power to the display control circuit 206 to light the power status display lamp 203 . In addition, the camera-side CPU 200 supplies the display control circuit 206 with clock signals, data signals, and the like necessary for displaying on the liquid crystal monitor 202, and also supplies power for driving the liquid crystal to cause the liquid crystal monitor 202 to perform display.
On the other hand, the camera-side CPU 200 is turned off when power is no longer supplied from the DC-DC converter 204 . At this time, since the lamp lighting signal and power supply from the camera side CPU 200 to the display control circuit 206 are stopped, the power status display lamp 203 is turned off. At the same time, the supply of signals and power necessary for displaying on the liquid crystal monitor 202 from the camera side CPU 200 to the display control circuit 206 is stopped, so the display on the liquid crystal monitor 202 is stopped.

Next, the operation of the circuit shown in FIG. 2 will be described. In FIG. 2, when both the state detection switch S1 and the power switch S2 are open, that is, when the lens barrel 101 is at the photographing position and the power switch S2 is at the ON position, the voltage V1 of the resistor R1 is Low level. Since the base current flows through the base (B) of the transistor Tr1, the current from the power supply unit 205 flows from the emitter (E) to the collector (C). This current is amplified by the DC-DC converter 204 and supplied to the camera side CPU 200 as power. Also, the current amplified by the DC-DC converter 204 is supplied to the lens side CPU 111 via the contact C as power.

As a result, the lens-side CPU 111 and the camera-side CPU 200 are activated, and communication is performed between these CPUs via the contact point B. FIG. Data signals, clock signals, control signals, and the like for performing AF and AE are transmitted and received here. As described above, when the lens barrel 101 is in the photographing state and the power switch S2 is in the ON position, photographing by the camera system 100 is possible.

In FIG. 2, when the state detection switch S1 is closed and the power switch S2 is open, that is, when the lens barrel 101 is in the retracted state and the power switch S2 is in the ON position, current flows through the resistor R2. only flows, the voltage V1 of the resistor R1 becomes High level. Therefore, the base current does not flow to the base (B) of the transistor Tr1, and the current from the power supply unit 205 also stops flowing from the emitter (E) to the collector (C). In this case, since the DC-DC converter 204 is turned off, the camera-side CPU 200 is also turned off. When the camera-side CPU 200 is turned off, the supply of the lamp lighting signal and power to the display control circuit 206 is stopped, so the power status display lamp 203 is turned off. At the same time, the display on the liquid crystal monitor 202 also stops. Thus, when the lens barrel 101 is in the retracted state, even if the power switch S2 is in the ON position, photographing by the camera system 100 is disabled.

Also, in FIG. 2, when the state detection switch S1 is open and the power switch S2 is closed, that is, when the lens barrel 101 is in the photographing state and the power switch S2 is in the OFF position, a current flows through the resistor R2. only flows, the voltage V1 of the resistor R1 becomes High level. Therefore, the base current does not flow to the base (B) of the transistor Tr1, and the current from the power supply unit 205 also stops flowing from the emitter (E) to the collector (C). In this case, as described above, the DC-DC converter 204 and the camera side CPU 200 are turned off, and the lamp lighting signal and power supply to the display control circuit 206 are also stopped, so the power status display lamp 203 is turned off. At the same time, the display on the liquid crystal monitor 202 also stops. As described above, even when the lens barrel 101 is in the photographing state, photographing by the camera system 100 is disabled when the power switch S2 is in the OFF position.

Also, in FIG. 2, when the state detection switch S1 is closed and the power switch S2 is also closed, that is, when the lens barrel 101 is in the retracted state and the power switch S2 is closed, a current flows through the resistor R2. Since it only flows, the voltage V1 of the resistor R1 becomes High level. Therefore, the base current does not flow to the base (B) of the transistor Tr1, and the current from the power supply unit 205 also stops flowing from the emitter (E) to the collector (C). In this case, as described above, the DC-DC converter 204 and the camera side CPU 200 are turned off, and the lamp lighting signal and power supply to the display control circuit 206 are also stopped, so the power status display lamp 203 is turned off. At the same time, the display on the liquid crystal monitor 202 also stops. Thus, even when the lens barrel 101 is in the retracted state and the power switch S2 is also in the off position, the camera system 100 cannot take pictures.

FIG. 3 is an explanatory diagram showing combinations of the states of the two switches described above and the power state of the camera system 100. As shown in FIG. As shown in FIG. 3, in the camera system 100 of the first embodiment, shooting is possible only when the lens barrel 101 is in the shooting state (the state detection switch S1 is in the OFF position) and the power switch S2 is in the ON position. becomes possible. Further, the power status display lamp 203 is turned on when shooting is possible, and the power status display lamp 203 is turned off when shooting is impossible.

According to 1st Embodiment mentioned above, there exist the following effects.
(1) When the state detection switch S1 detects that the lens barrel 101 is retracted while the power supply unit 205 is supplying power to the imaging unit 201, the power supply unit 205 supplies power. is cut off, the user can turn off the power of the camera system 100 simply by retracting the lens barrel 101 . Therefore, it is possible to improve operability when a lens barrel that can be stored by shortening the length of the barrel is attached. Also, by turning off the power under the above conditions, it is possible to prevent wasteful consumption of the battery due to forgetting to turn off the power after the lens barrel 101 is put into the stored state.
(2) The state detection switch S1 is a switch that is displaced between the first and second states according to the distance between the optical system consisting of the front lens group L1 and the rear lens group L2 and the imaging unit 201. Whether the camera 101 is stored or photographed can be detected with a simple configuration. Moreover, since the structure as a switch is simple, it can operate stably over a long period of time.
(3) In the above (1), when the state detection switch S1 cuts off the power supply from the power supply unit 205, the state detection switch S1 shifts from the second state to the first state to stop the power supply. Since the operation is restarted, the user can turn on the power of the camera system 100 by extending the lens barrel 101 from the retracted state to the photographing state without operating the power switch S2.
(4) The circuit including the transistor Tr1 cuts off/resumes the power supply from the power supply unit 205 according to whether the lens barrel 101 is in the retracted state or the photographing state. It is possible to realize turning on/off of the power supply according to the photographing state with a simple configuration.
(5) When the power switch S2 is in the ON position and the lens barrel 101 is extended, the power status display lamp 203 lights up. Since the status display lamp 203 is turned off, the user can easily identify whether shooting is possible or not by the lighting/extinguishing of the power supply status display lamp 203 .
(Second embodiment)

FIG. 4 is a circuit diagram showing the configuration of the camera system 100A in the second embodiment. In Figure 4. Equivalent parts to those in FIG. 2 are indicated by the same reference numerals.

A power control unit 207 is connected between the DC-DC converter 204 and the power supply unit 205 in the camera body 130A of this embodiment. The power control unit 207 is connected to the state detection switch S1, the power switch S2, and the display control circuit 206. FIG. The power control unit 207 is a circuit that selectively controls power supply from the power supply unit 205 according to the state of the state detection switch S1 and the state of the power switch S2, and is configured by a microprocessor. As will be described later, the power control unit 207 supplies a message display signal and power to the display control circuit 206 when the state detection switch S1 is in the second state when the power switch S2 is switched to the ON position. do. When the power switch S2 is in the ON position and the state detection switch S1 is in the first state, power is supplied from the power control unit 207 to the camera side CPU 200 through the DC-DC converter 204. FIG.

In a state in which power is being supplied from the power supply unit 205 to the imaging unit 201, the power control unit 207 adjusts the distance between the optical system including the front lens group L1 and the rear lens group L2 and the imaging unit 201 by the state detection switch S1. When it is detected that the second interval has been reached, that is, when the state detection switch S1 is in the second state, it functions as a cutoff unit that cuts off the power supply from the power supply unit 205 . In addition, in the function as the interrupting means, the power supply control unit 207, when the state detection switch S1 interrupts the supply of power while the power supply unit 205 is supplying power, switches the state detection switch S1 to the second state. The power supply is restarted by shifting from the state of 1 to the first state.

When the power switch S2 is switched to the ON position and the state detection switch S1 is in the second state, that is, when the lens barrel 101 is in the retracted state, the power control unit 207 controls the display control circuit A message display signal serving as a control signal and power are supplied to 206 to cause the liquid crystal monitor 202 to display a message such as "The lens is retracted." This message is for notifying the user that the power is off because the lens barrel 101 is retracted even though the power switch S2 is switched to the on position. While this message is displayed, the power of the camera system 100 remains off even if the power switch S2 is switched to the on position.

That is, the power control unit 207 (and the liquid crystal monitor 202) sets the distance between the optical system including the front lens group L1 and the rear lens group L2 and the imaging unit 201 to the second distance when the power switch S2 is switched to the ON position. , it functions as a notification means for notifying the user that the lens barrel 101 is in the retracted state.

When the state detection switch S1 is in the first state when the power switch S2 is switched to the ON position, that is, when the lens barrel 101 is in the photographing position, the power supply control unit 207 turns on the power supply unit 205. power to the DC-DC converter 204 . In this case, the camera system 100 is powered on. At the same time, the power control unit 207 stops supplying the message display signal and power to the display control circuit 206 .

Next, operation of the power control unit 207 will be described. FIG. 5 is a flowchart showing a processing procedure by the power control unit 207 from a state in which power supply by the power supply unit 205 is cut off to a state in which power supply is started.

First, the power control unit 207 determines whether the power switch S2 has been switched to the ON position (S101). If No here, the process returns to step S101, and if Yes, it is determined whether the state detection switch S1 is in the second state, that is, whether the lens barrel 101 is in the retracted state (S102). If No here, the power supply control unit 207 supplies power from the power supply unit 205 to the DC-DC converter 204 (S103). As a result, power is supplied to the camera-side CPU 200 and the lens-side CPU 111, and various signals and data are communicated between the two CPUs. In addition, the power status display lamp 203 is lit by supplying a lamp lighting signal and power from the camera side CPU 200 to the display control circuit 206 . On the other hand, if the determination in step S102 is Yes, a message display signal and power are supplied to the display control circuit 206, and the liquid crystal monitor 202 is notified that the power is off because the lens barrel 101 is in the retracted state. is displayed (S104). At this time, power is supplied to the display control circuit 206 , but the power status display lamp 203 is turned off by the display control circuit 206 . After that, the power control unit 207 shifts to the processing of the flowchart shown in FIG. 6, which will be described later.

FIG. 6 is a flowchart showing a processing procedure by the power control unit 207 from a state in which power is being supplied from the power source unit 205 to a state in which the power supply is cut off.

First, the power control unit 207 determines whether the power switch S2 has been switched to the OFF position (S201). If No here, the power control unit 207 determines whether the state detection switch S1 is in the second state (S202). Here, if No, the process returns to the determination of step S201. On the other hand, if the determination in step S202 is Yes, the power supply control unit 207 cuts off the power supply from the power supply unit 205 to the DC-DC converter 204 (S203). In this case, even if the power switch S2 is at the ON position, the power status display lamp 203 is extinguished and the display on the liquid crystal monitor 202 is also stopped. Also, if the determination in step S201 is Yes, the process proceeds to step S203, and power supply from the power supply unit 205 is cut off as described above. After that, the power control unit 207 shifts to the processing of the flowchart shown in FIG. 5 described above.

According to the above-described second embodiment, the same effects as (1) to (3) and (5) of the first embodiment are obtained. Furthermore, according to the second embodiment, the following effects are obtained.
(6) The power supply control unit 207 selectively controls the power supply from the power supply unit 205 according to the state of the state detection switch S1 and the state of the power switch S2. A simple program can be used to turn on/off the power depending on whether the camera is stored or photographed.
(7) When the state detection switch S1 is in the second state (ON position) when the power switch S2 is switched to the ON position, a message such as "the lens is retracted" is displayed on the liquid crystal monitor 202. Since the information is displayed, the user can easily understand the reason why the power is not turned on even though the power switch S2 is switched to the ON position.
(deformed form)

The present invention is not limited to the embodiments described above, and various modifications and changes as shown below are possible, and these are also within the scope of the present invention.
(1) The state detection switch S1 is not limited to the position shown in the figure, but any position that can detect that the lens barrel 101 is in the retracted state and that does not affect the optical performance. may be placed in Also, the state detection switch S1 may be configured by a sensor.
(2) As in the second embodiment, according to the state of the state detection switch S1 and the state of the power switch S2, the power supply control selectively controls the power supply by the power supply unit 205 and the power switch S2. The configuration may be such that switching between normal power supply control, which controls power ON/OFF based only on the state, can be made according to the user's selection.
(3) In the above embodiment, an example in which the present invention is applied to a lens-interchangeable digital camera has been shown, but the present invention is not limited to this, and can also be applied to a lens-integrated camera, a video camera, and the like. .

Further, the above-described embodiments and modifications can be used in combination as appropriate, but since the configuration of each embodiment is clear from the drawings and descriptions, detailed descriptions thereof will be omitted. Furthermore, the present invention is not limited by the embodiments described above.

100, 100A: camera system, 101: lens barrel, 111: lens-side CPU, 130, 130A: camera body, 200: camera-side CPU, 201: imaging unit, 202: liquid crystal monitor, 203: power status display lamp, 204 : DC-DC converter, 205: power supply unit, 206: display control circuit, 207: power supply control unit, Tr1: transistor, S1: state detection switch, S2: power switch

Claims (13)

A camera body capable of communicating with a lens barrel having a retracted state and a photographing state,
an imaging unit that captures an image of a subject;
a display unit that displays the subject image;
a communication unit that communicates with the lens barrel and receives information indicating the stored state or the shooting state from the lens barrel;
an operation unit for switching between a first state in which power is supplied from the power supply unit and a second state in which power is not supplied from the power supply unit;
When the operation unit is switched to the first state and information indicating the shooting state is received from the lens barrel, the imaging unit can capture the subject image, and the display unit displays the subject image. is possible and
When the operation unit is switched to the first state and information indicating the retracted state is received from the lens barrel, the imaging unit cannot capture the subject image and the display unit is in the retracted state. The camera body that displays the 2. The camera body according to claim 1, wherein the display section displays the display indicating the retracted state, and then stops the display when the retracted state is maintained. 3. The camera body according to claim 1, further comprising a light-emitting section that emits light when information indicating the shooting state is received from the lens barrel in the first state. 4. The camera body according to claim 3, wherein the light emitting section does not emit light when it is in the first state and receives information indicating the retracted state from the lens barrel. 2. The camera body according to claim 1, wherein when the display unit is in the first state and receives information indicating the shooting state from the lens barrel, the display unit does not display the retracted state. 6. The camera body according to any one of claims 1 to 5, wherein the display indicating the retracted state is displayed by characters. 7. The lens according to any one of claims 1 to 6, wherein the distance between the lens of the lens barrel in the housed state and the imaging unit is narrower than the distance between the lens and the imaging unit in the imaging state. camera body. 8. The camera body according to any one of claims 1 to 7, further comprising a mount section having the communication section. 9. The camera body according to claim 8, further comprising an urging portion that urges the communication portion and has conductivity. a control unit that controls the imaging unit and the display unit;
a flexible substrate that connects the biasing unit and the control unit;
10. The camera body of claim 9, comprising: 11. The camera body according to any one of claims 1 to 10, further comprising an image processing section that performs image processing on the image data output by the imaging section. 12. The camera body according to any one of claims 1 to 11, wherein the power supply section is switched between on and off depending on whether the lens barrel is in the photographing state or the retracted state. A lens barrel detachable from the camera body according to any one of claims 1 to 12.

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