JP2009042614A - Camera battery holder - Google Patents

Abstract

Provided is a battery holder that prevents wasteful power consumption and increases the number of shots.
Switches (87, 88) for bypassing diodes (83, 84) for preventing backflow are provided. The switches (87, 88) are switched according to whether or not a battery is loaded in a battery chamber (110a, 110b). change. When two batteries are loaded, the switches 87 and 88 are turned off, and the diodes 83 and 84 operate as diodes to prevent backflow. When only one battery is loaded, either of the switches 87 and 88 is turned on, bypasses the backflow prevention diodes 83 and 84, and is supplied with power through the switches 87 and 88. There is no voltage drop.
[Selection] Figure 6

Description

The present invention relates to a battery holder for a camera, and more particularly to a detachable camera battery holder that can be loaded with a plurality of batteries and connected to a camera body to supply power.

In order to supply power to the camera body, a power supply battery is built in the camera body, but in addition to that, a removable battery holder has been conventionally used. And as a battery holder, the type which connects two batteries in parallel is also known (for example, patent documents 1). In such a battery parallel type battery holder, a backflow preventing diode is connected to prevent a backflow current from flowing between a plurality of batteries.
JP 2007-80617 A

In the battery holder disclosed in Patent Document 1, two batteries are connected in parallel, and two backflow prevention diodes D1 and D2 are connected between the positive electrodes of the two batteries. The anodes of the diodes are connected to each other. This anode connection point is connected to a power supply circuit in the camera body.

Thus, in the battery holder disclosed in Patent Document 1, the current of the battery flows backward by the action of the two diodes D1 and D2, and waste of power can be prevented. However, in the case where only one battery is loaded in the battery holder, the backflow prevention diode D1 or D2 is not necessary, but the number of shots is taken due to the voltage drop in the backflow prevention diode D1 or D2. Will fall.

The reduction in the number of shots due to this voltage drop will be described with reference to FIG. FIG. 8 is a diagram showing the relationship between the discharge capacity and the voltage drop for each temperature of the usage environment. In general, a semiconductor element of a digital camera operates if there is a voltage of 6.0 V or more, and the forward voltage in the diode varies depending on the flowing current. When the current necessary for this is passed, the voltage is 0.6V. When the backflow prevention diode is not connected, it operates at 6.0 V or more, but when the backflow prevention diode is connected, it does not operate unless it is 6.6 V.

As a result, when the ambient temperature is 0 ° C., when the backflow prevention diode is connected, the discharge capacity can only be used up to about 1600 mAh, whereas the backflow prevention diode is connected. When not, the battery can be used up to about 1950 mAh. When a backflow preventing diode is connected, the number of frames that can be photographed decreases according to the difference in discharge capacity.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a battery holder that prevents wasteful power consumption and increases the number of shots.

In order to achieve the above object, a battery holder according to a first invention is a detachable battery holder that can be loaded with a plurality of batteries and is connected to a battery chamber of a camera body to supply power from the batteries. Turns off when a battery is loaded into the chamber, turns off when no battery is loaded, and turns off when a battery is loaded into the second battery chamber and turns off when no battery is loaded A second switch that is on, a first rectifying element that rectifies so that a reverse current does not flow through the battery loaded in the first battery chamber, and a battery loaded in the second battery chamber. A second rectifying element that rectifies so that a reverse current does not flow, and bypasses the second rectifying element when the first switch is turned on, while the first rectifying element is turned on when the second switch is turned on; Bypass.

In the battery holder according to the second invention, in the first invention, the first and second rectifying elements are diodes.

In order to achieve the above object, a battery holder according to a third aspect of the present invention is a detachable battery holder that can be loaded with a plurality of batteries and connected to the battery chamber of the camera body to supply power from the batteries. A first switch that changes in accordance with a battery loading state in the chamber, a second switch that changes in accordance with a battery loading state in the second battery chamber, and a battery loaded in the first battery chamber. A first rectifying element connected to prevent reverse current and a second rectifying element connected to a battery loaded in the second battery chamber to prevent reverse current, the battery being installed in the first battery chamber; When the battery is not loaded, the first switch bypasses the second rectifying element, and when the battery in the second battery chamber is not loaded, the second switch Rectifier element To bypass.

A battery holder according to a fourth invention is the battery holder according to the third invention, wherein the first switch and the second switch are normally-on type switches, and the battery mounted in the first battery chamber or The first switch and the second switch are turned off by the battery loaded in the second battery chamber.
According to a fifth aspect of the present invention, in the battery holder according to the third aspect, the first and second rectifying elements are diodes.

In order to achieve the above object, the battery holder power supply method according to the eighth aspect of the present invention is such that the first and second batteries can be loaded in parallel connection and connected to the battery chamber of the camera body via a diode for preventing backflow. A power supply method for a removable battery holder that supplies power from the battery, and when detecting that one of the first and second batteries is loaded, at least the loaded battery The connected backflow prevention diode is bypassed, and when it is detected that both the first and second batteries are loaded, the backflow prevention diode is operated.

According to the present invention, it is possible to provide a battery holder that prevents unnecessary power consumption and increases the number of shots.

Hereinafter, a preferred embodiment will be described using a battery holder that can be loaded into a digital single-lens reflex camera to which the present invention is applied according to the drawings. Since the battery holder according to the embodiment of the present invention can be loaded with two batteries, and the two batteries are connected in parallel, the digital camera can be operated by loading only one battery.

FIG. 1 is a block diagram showing an electric circuit of a camera system including a battery holder 80, a camera body 20, and a lens barrel 10. Inside the lens barrel 10, a photographing optical system 11 for focus adjustment and focal length adjustment, and a diaphragm 12 for adjusting the aperture amount are arranged. The photographing optical system 11 is driven by a lens driving mechanism 13 and the diaphragm 12 is connected to be driven by a diaphragm driving mechanism 14.

The lens driving mechanism 13 and the aperture driving mechanism 14 are each connected to a lens control microcomputer (hereinafter referred to as Lμcom) 15, and the Lμcom 15 is connected to the camera body 20 via a communication connector 35. Lμcom 15 controls the inside of the lens barrel 10 and controls the lens driving mechanism 13 to perform focusing and zoom driving, and also controls the diaphragm driving mechanism 14 to control the aperture value.

A movable reflection mirror 40 is provided in the mirror box of the camera body 20, and a position inclined by 45 degrees with respect to the optical axis of the photographing optical system 11 to reflect the subject image to the observation optical system, and the subject image. In such a manner that it can be pivoted between the position where it jumps up to guide it to the image sensor 51 for imaging.

A finder optical system 41 including a focusing screen for forming a subject image, a Porro prism for reversing the subject image, and the like are disposed above the movable reflecting mirror 40. An eyepiece 42 for observing a subject image is disposed on the exit side (right side in FIG. 1) of the finder optical system 41.

Further, on the exit side (upper side in FIG. 1) of the finder optical system 41, a display image sensor 43 and a photometry circuit 44 including a photometry sensor are disposed at positions that do not interfere with imaging. The display image sensor 43 may be a CCD (Charge Coupled Devices) or a CMOS (Complementary Metal).
It goes without saying that a two-dimensional imaging device such as Oxide Semiconductor) can be used.

Near the center of the movable reflecting mirror 40 is a half mirror, and on the back surface of the movable reflecting mirror 40 is a sub mirror for reflecting subject light transmitted through the half mirror portion to the lower part of the mirror box of the camera body 20. 47 is provided. The sub mirror 47 is rotatable with respect to the movable reflection mirror 40. When the movable reflection mirror 40 is flipped up, the sub mirror 47 is rotated to a position covering the half mirror portion, and the movable reflection mirror 3 is at the subject image observation position. Sometimes it is in an open position with respect to the movable reflecting mirror 40 as shown. The movable reflecting mirror 40 is driven by a mirror driving mechanism 54.

An AF sensor unit 48 is disposed below the sub mirror 47. The AF sensor unit 48 is an AF unit for performing distance measurement by a known TTL pupil division method, and an AF sensor is provided inside. It has been. The AF sensor unit 48 is connected to an AF sensor drive circuit 53. The AF sensor drive circuit 53 drives the circuit system of the AF sensor unit 48 and reads signals from the AF sensor. Based on this signal output, the amount of defocus of the subject image formed by the photographing optical system 11 is obtained.

A focal plane type shutter 50 for controlling the exposure time is disposed behind the movable reflecting mirror 40. The shutter 50 is shutter-charged by a shutter charge mechanism 55. The shutter 50 is connected to a shutter control circuit 56 and controls the shutter front curtain and rear curtain. An imaging element 51 for photographing is disposed behind the shutter 50, and a subject image formed by the photographing optical system 11 is photoelectrically converted into an electric signal. As the imaging image sensor 51, a two-dimensional image sensor such as a CCD or a CMOS can be used like the display image sensor 43, and an element having a larger number of pixels than the display image sensor 43 is used.

Outputs of the image sensor 51 for photographing and the image sensor 43 for display are connected to an interface circuit 59, and the interface circuit 59 performs analog-digital conversion (AD conversion) and the like. The interface circuit 59 is connected to the image processing controller 60. The image processing controller 60 performs various kinds of image processing such as color correction, gamma (γ) correction, contrast correction, monochrome / color mode processing, and live view image processing on the AD-converted image data. In addition, the image data is compressed and decompressed by a method such as JPEG or TIFF. Note that image compression is not limited to JPEG or TIFF, and other compression methods can be applied.

The image processing controller 60 includes an SDRAM (Synchronous Dynamic Random Access) as a buffer memory.
A memory (ROM) 61, a flash ROM (Flash ROM) 62, a recording medium 63, and a liquid crystal monitor 26 are connected. The SDRAM 61 temporarily stores image data that has undergone image processing. The flash ROM 62 is an electrically rewritable non-volatile memory, and stores various parameters related to image processing that is processed in accordance with user preferences for image data.

The recording medium 63 is a memory for storing image data, and is a rewritable recording medium such as an xD picture card (registered trademark), a compact flash (registered trademark), an SD memory card (registered trademark), or a memory stick (registered trademark). Any one of these can be loaded, and is detachable from the camera body 20. In addition, the hard disk may be configured to be connectable via a communication contact. The liquid crystal monitor 26 is disposed on the back surface of the camera body 20 and performs live view display, captured image display, playback image display, and shooting information display. Note that the display device is not limited to the liquid crystal monitor.

The image processing controller 60 is connected to a body control microcomputer (Bμcom) 65 that is a controller for controlling the camera body 20. The Bμcom 65 is connected to the above-described communication connector 35, photometry circuit 44, AF sensor drive circuit 53, mirror drive mechanism 54, shutter charge mechanism 55, and shutter control circuit 56, and controls these circuits and mechanisms. The communication connector 35 can be connected to an electrical contact of the lens barrel 10 and is a connector for communicating with the Lμcom 15.

The Bμcom 65 is connected to the nonvolatile memory 67, the operation display LCD 68, the camera operation switch 69, and the power supply circuit 70. The non-volatile memory 67 is an electrically rewritable non-volatile memory such as an EEPROM, and stores camera adjustment values and the like. The operation display LCD 68 is a small liquid crystal display device disposed on the upper surface of the camera body 20 in order to display an operation state.

The camera operation switch 69 is a switch for detecting the first and second strokes of the shutter release button, a switch for instructing a playback mode, a switch for instructing an ISO setting mode, a switch for instructing white balance setting, and a screen of the liquid crystal monitor 26 The switch includes a switch for instructing the movement of the cursor, a switch for instructing a shooting mode in conjunction with the mode dial, an OK switch for determining each selected mode, and a switch for instructing display switching.

A battery (not shown) loaded in the camera body 20 and battery cells 91a and 91b built in a battery holder 80 described later are connected to a power supply circuit 70. The power supply circuit 70 sets a predetermined voltage. It is converted into a voltage and supplied to each circuit unit or the like.

A battery holder 80 can be loaded into the camera body 20, and both can be electrically connected via a contact group 75. Two battery packs of battery pack 1 90a and battery pack 2 90b can be individually loaded in this battery holder 80, and both can be electrically connected in parallel via contact groups 82a and 82b. .

The battery pack 1 90a and the battery pack 2 90b each include a battery cell 91a and a battery cell 91b, and the thermistors 92a and 92b are connected in parallel to the battery cell. The battery holder 80 into which the battery packs 90a and 90b are loaded is provided with contact groups 82a and 82b each having three contact points, and the positive electrode (+ electrode) 96 and the negative electrode (−electrode) of the battery cells 91a and 91b. A terminal 98 and detection output terminals 97 of the thermistors 92a and 92b are provided (see FIG. 3).

The positive electrode 96 of the battery cell 91 a is connected to the anode / cathode of the diode 83 through the contact group 82 a and the power supply circuit 70 through the contact group 75. A switch 87 is connected between the anode and cathode of the diode 83. The positive electrode 96 of the battery cell 91b is connected to the anode / cathode of the diode 84 through the contact group 82b and the power supply circuit 70 through the contact group 75. A switch 88 is connected between the anode and cathode of the diode 84. The diode 83 and the diode 84 are composed of a Schottky diode or a PN junction diode. The switching operation of the switches 87 and 88 will be described later with reference to FIG.

Each negative electrode terminal 98 of the battery cells 91a and 91b and one end side of the thermistors 92a and 92b are both connected to the ground level side, and are connected to the ground level of the camera body 20 via the contact group 75. The detection output terminals of the thermistor 92 a and the thermistor 92 b are connected to the Bμcom 65 in the camera body 20 via the contact group 75.

In addition, a release button (not shown) is disposed on the battery holder 80. The release button (not shown) performs the same function as the release button provided on the camera body 20, and is turned on in response to half-pressing of the release button. 85 and a 2R switch 86 that is turned on in conjunction with the full depression of the release button. One end side of the 1R switch 85 and the 2R switch 86 is connected to the Bμcom 65 of the camera body 20 via the contact group 75, and the other end side is also connected to another terminal of the Bμcom 65 via the contact group 75, respectively. Yes.

Next, the structure of the battery holder 80 in this embodiment is demonstrated using FIG. FIG. 2 is an external perspective view of the battery holder 80, and the battery holder 80 can be attached to the bottom of the camera body 20. That is, the contact support column 100 can be inserted into the internal battery storage chamber in the camera body 20, and the tripod screw 105 formed of a male screw is screwed into a female screw (not shown) at the bottom of the camera body 20. Is possible.

The horizontal cross section of the contact support column 100 is similar to the horizontal cross sectional shape of the built-in battery chamber of the camera body 20 and has a slightly smaller size. Further, contact surfaces 101, 102, and 103 are provided on the upper side of the side surface of the contact column 100, and these are plus terminals that are connected to three connection terminals of the contact group 75, that is, the power supply circuit 70. It corresponds to a pole terminal, a terminal connected to the thermistor 92a, and a minus pole terminal connected to the ground level (see FIG. 1).

The contact surface 101 provided on the contact column 100 is a plus electrode terminal (+), the contact surface 102 is a thermistor electrode terminal (T), and the contact surface 103 is a minus electrode terminal (−). These contact surfaces are slightly recessed from the side surface of the contact support column 100 and are arranged side by side on substantially the same surface.

In addition, signal lines 111, 112, 113, and 114 are disposed on the upper end surface of the contact support column 100. The signal line 111 corresponds to a line connecting the 1R switch 85 and the Bμcom 65, the signal line 112 corresponds to a line connecting the 2R switch 86 and the Bμcom 65, and the signal line 113 connects the 1R switch 85 and the 2R switch 86 to the ground level. The signal line 114 corresponds to a line connecting the thermistor 92b to the Bμcom 65.

The tripod screw 105 shown in FIG. 2 is integrally formed with the tripod screw dial 106, and the tripod screw 105 is also rotated by rotating the tripod screw dial 106, and the battery holder 80 is detachable from the camera body 20. . Further, on the bottom side of the battery holder 80, battery chambers 110a and 110b for loading the battery pack 90 along the arrow A direction are provided. When the battery packs 90a and 90b are loaded into or removed from the battery chambers 110a and 110b, the openable / closable cover 107 can open and close the openings of the battery chambers 110a and 110b.

In the battery chamber 110a, an insertion detection lever 115 is arranged. In the normal state, the insertion detection lever 115 is raised by a spring bias as shown in FIG. When 90a is inserted, the insertion detection lever 115 is pushed down. The above-described switch 88 (see FIG. 1) is a normally-on type switch and is interlocked with the insertion detection lever 115.

That is, in a state where the battery pack 90a is not loaded in the battery chamber 110a, the insertion detection lever 115 is raised, so that the switch 88 is on. Therefore, the diode 83 connected to the battery cell 91a is short-circuited (bypass State). Next, when the battery pack 90a is loaded in the battery chamber 110a, the insertion detection lever 115 is pushed down and the switch 88 is turned off, so that the diode 83 connected to the battery cell 91a operates as a diode.

Similarly, an insertion detection lever 121 is disposed in the battery chamber 110b. The insertion detection lever 121 is raised by a spring bias in a normal state, but the battery pack 90b is inserted from the opening 125. Then, the insertion detection lever 121 is pushed down. The above-described switch 87 (see FIG. 1) is also a normally-on type switch and is interlocked with the insertion detection lever 121.

That is, when the battery pack 90b is not loaded in the battery chamber 110b, the insertion detection lever 121 is raised, so that the switch 87 is on. Therefore, the diode 84 connected to the battery cell 91b is short-circuited (bypassed). State). Next, when the battery pack 90b is loaded into the battery chamber 110b, the insertion detection lever 121 is pushed down and the switch 87 is turned off, so that the diode 84 connected to the battery cell 91b operates as a diode.

The battery pack 90 has the same configuration as the battery packs 90a and 90b in FIG. 1, and has battery cells 91a and 91b and thermistors 92a and 92b inside, and the outside is sealed by a case 95 as shown in FIG. Yes. A plus (+) pole terminal 96, a thermistor terminal 97, and a minus (−) pole terminal 98 are provided on the ridge line portion of the case 95.

The operation when the battery packs 90a and 90b are loaded in the battery holder 80 according to the embodiment of the present invention configured as described above will be described with reference to FIG. First, in a state where the battery pack 90 is not loaded in any of the battery chambers 110a and 110b, since the insertion detection levers 115 and 121 are raised, the switches 88 and 87 are set as shown in FIG. It is on. For this reason, both ends of each of the diodes 83 and 84 are short-circuited (bypassed).

Subsequently, when the battery pack 90 is loaded in both the battery chambers 110a and 110b, the switches 87 and 88 connected to both ends of the diodes 83 and 84 are turned off as shown in FIG. For this reason, although a voltage drop occurs in each of the diodes 83 and 84, the power supply current of the battery pack 90a is supplied to the power supply circuit 70 of the camera body 20 via the diode 83, and the power supply current of the battery pack 90b is supplied via the diode 84. To the power supply circuit 70 of the camera body 20. At this time, the diodes 83 and 84 have an effect of preventing the backflow of the power supply current and preventing the wasteful use of power.

Next, when the battery pack 90a is loaded only in the battery chamber 110a and the battery pack 90 is not loaded in the battery chamber 110b, the switches 88 connected to both ends of the diode 83 are connected as shown in FIG. The switch 87 connected to both ends of the diode 84 is turned off. As a result, since the power supply current from the battery pack 90a is supplied to the power supply circuit 70 via the switch 88, no voltage drop occurs in the diode 83.

Conversely, when the battery pack 90a is loaded only into the battery chamber 110b and the battery pack 90 is not loaded into the battery chamber 110a, the switches 87 connected to both ends of the diode 84 are turned on and connected to both ends of the diode 83. The switch 88 is turned off. As a result, the power supply current from the battery pack 90 b is supplied to the power supply circuit 70 via the switch 87, so that no voltage drop occurs in the diode 84.

As described above, in the present embodiment, when the battery pack 90 is loaded in both the battery chambers 110a and 110b, the diodes 83 and 84 are interposed to prevent the reverse current from flowing, while the battery chamber 110a. When the battery pack 90 is loaded in either one of the battery packs 110b, both ends of the diode 83 or 84 connected to the battery pack 90 are short-circuited so that no voltage drop occurs in the diode.

Next, a modification of the switches 87 and 88 in this embodiment will be described with reference to FIG. The switches 87 and 88 in the present embodiment are normally-on type switches that interlock with the insertion detection levers 115 and 121 as shown in FIG. 4, but in the modification shown in FIG. 5, they are located behind the battery chambers 110a and 110b. Normally-on type switches 122 and 123 are arranged, respectively. Therefore, since the configuration and operation of this embodiment are the same except that the switch 87 in this embodiment is replaced with the switch 122 and the switch 88 is replaced with the switch 123, detailed description will be omitted.

In this modification of the present embodiment, when the battery pack 90 is loaded in the battery chambers 110a and 110b, the switches 122 and 123 are switched from on to off as well as the switches 87 and 88, and in parallel with these switches. The diodes 83 and 84 connected to are operated as diodes. Therefore, when the battery pack 90 is loaded in one of the battery chambers 110a and 110b, the diodes 83 and 84 are in a bypass (short circuit) state, and the battery pack 90 is loaded in both the battery chambers 110a and 110b. In such a case, the diodes 83 and 84 operate as diodes to prevent a reverse current.

As described above, the battery holder according to the present embodiment is provided with the switches 87 and 88 for bypassing the backflow preventing diodes 83 and 84, and the switches 87 and 88 have batteries in the battery chambers 110a and 110b. The switch state changes depending on whether or not the battery is loaded. Therefore, when only one battery is loaded and the backflow prevention diodes 83 and 84 are unnecessary, the backflow prevention diode can be bypassed, and the voltage drop generated in the diodes 83 and 84 is minimized. Can be.

The battery holder 80 according to the present embodiment can be loaded with two battery packs 90, but may be three or more. In this case, when only one battery pack 90 is loaded, the backflow prevention diode is bypassed, and when two or more battery packs 90 are loaded, the backflow prevention diode is operated. To cancel the bypass. Further, both ends of the diodes 83 and 84 are connected so as to be directly short-circuited by the switches 87 and 88. However, the present invention is not limited to this, and the diodes 83 and 84 may be connected so as to substantially bypass the diodes 83 and 84.

In addition, although PN junction or Schottky barrier type diodes 83 and 84 are provided for backflow prevention, the present invention is not limited to this, and any rectifying element having a backflow prevention function may be used. For example, a transistor, FET, or the like may be used. Good.

Furthermore, in the present embodiment, as shown in FIGS. 4 and 5, the loading of the battery pack 90 is detected by a mechanical mechanism such as the insertion detection levers 115 and 121 and the push switches 122 and 123. The interlocking switch is provided. However, the present invention is not limited to this, and an electrically interlocking switch may be used, and detection may be performed by an electrical switch such as a photoelectric switch.

In the description of the embodiments of the present invention, the camera is applied to a digital single-lens reflex camera. However, the digital camera may be either a single-lens reflex type or a compact type digital camera, or these digital cameras. In addition, it may be a portable electronic device such as a film camera or a video camera, or may be an imaging device incorporated in a dedicated machine. In any case, the present invention can be applied to any battery holder that is used in combination with an imaging device such as a camera, or any imaging device such as a camera that can be used in combination with a battery holder.

1 is a block diagram mainly showing an electric system of a camera and a battery holder according to an embodiment of the present invention. It is an external appearance perspective view of the battery holder concerning one Embodiment of this invention. 1 is an external perspective view of a battery pack according to an embodiment of the present invention. It is an external appearance perspective view which shows the battery chamber of the lower side of the battery holder concerning one Embodiment of this invention. It is an external appearance perspective view which shows the modification of the battery chamber of the lower side of the battery pack in one Embodiment of this invention. In the battery pack concerning one Embodiment of this invention, it is a block diagram which shows the loading state of a battery pack, and the state of a switch, (A) when a battery pack is unloaded, (B) is loading two battery packs (C) is a block diagram showing a case where one battery pack is loaded. It is a figure which shows the relationship between the voltage of the battery which can be used by one Embodiment of this invention, and discharge capacity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Lens barrel, 11 ... Imaging optical system, 12 ... Diaphragm, 13 ... Lens drive mechanism, 14 ... Diaphragm drive mechanism, 15 ... Microcomputer for lens control (L [mu] com) , 20 ... Camera body, 26 ... Liquid crystal monitor, 35 ... Communication connector, 40 ... Movable reflecting mirror, 41 ... Viewfinder optical system, 42 ... Eyepiece, 43 ... Display Image sensor 44, photometric circuit, 47 sub-mirror, 48 AF sensor unit, 50 shutter, 51 image sensor, 53 AF sensor drive circuit, 54 ... Mirror drive mechanism, 55 ... Shutter charge mechanism, 56 ... Shutter control circuit, 59 ... Interface circuit, 60 ... Image processing controller, 61 ... SDRAM, 62 ... Flash ROM, 63... Recording medium, 65... Microcomputer for body control (B.mu.com), 67... Nonvolatile memory, 68... LCD for operation display, 69. ..Power circuit, 75 ... contact group, 80 ... battery holder, 82a ... contact group, 82b ... contact group, 83 ... diode, 84 ... diode, 85 ... 1R Switch, 86 ... 2R switch,
87 ... switch, 88 ... switch, 90a ... battery pack 1, 90b ... battery pack 2, 91a ... battery cell, 91b ... battery cell, 92a ... thermistor, 92b ..Thermistor, 96... Positive electrode terminal, 97... Thermistor terminal, 98... Negative electrode terminal, 100 .. Contact column, 101. ..Contact surface 105 ... Tripod screw 106 ... Tripod screw dial 107 ... Cover 110a ... Battery chamber 110b ... Battery chamber 111 ... Signal wire 112 Signal line, 113 ... signal line, 114 ... signal line, 115 ... insertion detection lever, 121 ... insertion detection lever, 122 ... switch, 123 ... switch, 124 ... Opening, 125 ・- opening

Claims (6)

In a removable battery holder that can be loaded with multiple batteries and connected to the battery compartment of the camera body to supply power from the battery,
A first switch that is off when a battery is loaded into the first battery chamber and is on when no battery is loaded;
A second switch that is turned off when a battery is loaded into the second battery chamber and is on when no battery is inserted;
A first rectifying element that rectifies so that a reverse current does not flow through the battery loaded in the first battery chamber;
A second rectifying element for rectifying so that a reverse current does not flow in the battery loaded in the second battery chamber;
With
A battery holder, wherein the second rectifier element is bypassed when the first switch is turned on, and the first rectifier element is bypassed when the second switch is turned on.   The battery holder according to claim 1, wherein the first and second rectifying elements are diodes. In a removable battery holder that can be loaded with multiple batteries and connected to the battery compartment of the camera body to supply power from the battery,
A first switch that changes according to the state of loading of the battery in the first battery chamber;
A second switch that changes according to the state of loading of the battery in the second battery chamber;
A first rectifier for preventing reverse current connected to a battery loaded in the first battery chamber;
A second rectifier for preventing reverse current connected to a battery loaded in the second battery chamber;
With
When the battery is not loaded in the first battery chamber, the first switch bypasses the second rectifier element, while when the battery in the second battery chamber is not loaded. A battery holder, wherein the first rectifying element is bypassed by the second switch.   The first switch and the second switch are normally-on type switches, and the first switch and the second battery are loaded by the battery loaded in the first battery chamber or the battery loaded in the second battery chamber. The battery holder, wherein the switch and the second switch are turned off.   The battery holder, wherein the first and second rectifying elements are formed of diodes. A power supply method for a detachable battery holder in which first and second batteries can be loaded in parallel connection, connected to a battery chamber of a camera body via a diode for preventing backflow, and power is supplied from the battery. ,
When it is detected that one of the first and second batteries is loaded, at least the backflow prevention diode connected to the loaded battery is bypassed,
When it is detected that both the first and second batteries are loaded, the backflow prevention diode is operated.
The power supply method in the battery holder characterized by the above-mentioned.