JPS6281938A - Power source for electronic device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD 1 The present invention relates to a power supply device for electronic equipment, and more particularly to a power supply device for electronic equipment driven by a secondary battery. A case having almost the same shape as the case for storing the battery is provided, and the dry battery is stored in the case, and at least a constant voltage circuit is incorporated in the case to store the secondary battery. Instead of a case, a case housing this dry cell battery is attached to an electronic device, so that the electronic device can be driven by the dry cell battery.For example, a video camera with a built-in VTR is made of nickel.
Secondary batteries such as cadmium batteries and lead batteries are now being used, and these secondary batteries are made into a pack and attached to the camera to drive the camera. This is because video cameras are driven by flowing a certain amount of large current. Therefore, in such a video camera, when the secondary battery is discharged, it must be charged before use.

[Problems to be solved by the invention]

When an electronic device is driven by a secondary battery in this manner, if the secondary battery is discharged, the electronic device cannot be used immediately and must wait until charging is completed. Therefore, when using a nickel-cadmium battery, even if rapid charging is performed, a charging time of about one hour is required, and the video camera cannot be used during this time. In addition, if the battery is discharged outdoors etc.
It is not possible to charge the battery immediately, which results in the disadvantage that the video camera becomes unusable. In view of these problems, it is considered to use dry cell batteries as they are, but if a normal dry cell battery is used instead of a nickel-cadmium battery, a large load will be applied to the battery and the terminals will be damaged. The voltage drops suddenly, creating the possibility that the video camera will not operate properly. The present invention has been made in view of the above-mentioned problems. When a secondary battery such as a nickel-cadmium battery is discharged in an electronic device such as a video camera with a built-in VTR, the device can be powered up by a dry cell. An object of the present invention is to provide a power supply device for electronic equipment capable of driving a power supply device for electronic equipment.

[Means for Solving the Problems 1] The present invention provides an electronic device driven by a secondary battery, which includes a case having almost the same shape as the case housing the secondary battery, and a case inside the case. A dry battery is housed in the case, and at least a constant voltage circuit is built into the case, and the case housing the dry battery is attached to the electronic device in place of the case housing the secondary battery. This electronic device can be driven by the following. K Effect 1 Therefore, according to the present invention, when a battery pack containing a secondary battery is discharged and becomes unusable, this power supply device makes it possible to drive an electronic device with a dry battery. K\Example] The present invention will be described below with reference to an illustrated example. FIG. 2 shows a VT equipped with a power supply device according to an embodiment of the present invention.
This video camera 10 is equipped with a cassette holder 11 on the side thereof, and a tape cassette can be loaded into the cassette holder 11 and set in the built-in VTR. It looks like this. Further, an optical lens 12 is attached to the front side of the video camera 10, and a view finder 13 is provided to the back side. Also, at the bottom of this video camera 10 is a grip 14 that also serves as a battery holder.
A lid plate 15 is attached to the lower part of the grip 14 so as to be openable and closable. 17. That is, this video camera 10 can be equipped with a secondary battery pack 16.
This allows it to be driven by a nickel-cadmium battery, and the dry battery pack 17 allows it to be driven by a dry battery. Next, to explain this dry battery bag 17, as shown in FIGS. 1, 3, and 4, the pack 17
includes a case 18, and a cover plate 19 is attached to the case 18 so as to be openable and closable via a hinge 20. Note that the cover plate 19 is locked in a closed state by a lock claw 21. The inside of the cover plate 19 is configured as a dry cell storage space 22, in which, for example, four dry cell batteries 23 are housed and held, as shown in FIG. Further, the case 18 of the dry battery bag 17 has an opening 24 formed at its front end, and a slider 25 is slidably held within this opening 24. . Further, on the front side of the case 18 of the bag 17, as shown in an enlarged view in FIG. 26 is installed. Note that the positions of the opening 24 and the terminal plate 26 are the same as those of the secondary battery bag 16 that accommodates the nickel-cadmium battery. Next, to explain the internal structure of this bag 17, as shown in FIGS. 1 and 5, a partition wall 27 is formed inside the case 18, and the partition wall 27 separates the battery storage space 22 from the battery storage space 22. A circuit board 28 is arranged in a separate space. A switch 29 is mounted on this circuit board 28 along with other circuit components. The upper surface of this switch 29 is equipped with an operator 30, and this operator 30 is connected to the engaging hole 3 of the slider 25.
1 is now accepted. Further, the predetermined pattern on this circuit board 28 is formed by the lead wires 3.
The terminal board 26 is connected to the terminal board 26 through the terminal board 2. Next, the circuit on this circuit board 28 will be explained.
As shown in FIG. 8, the switch 29 is connected to the dry battery 23, and the switch 29 is connected to the dry battery 23.
is connected to a series circuit of a coil 33 and a diode 34. A transistor 35 is connected to the connection point between the coil 33 and the diode 34, and the base of the transistor 35 is connected to a pulse width modulator 36. This pulse width modulator 36 includes a resistor 38 and a variable resistor 3.
The voltage generated at the connection point 9 is detected and the pulse width is modulated according to this voltage. Furthermore, a smoothing capacitor 27 is connected in parallel to the series circuit of these resistors 38 and variable resistors 39, and this condenser 37 is connected to an output terminal 43. In the above configuration, when the battery in the secondary battery puncture 16 for driving the video camera 10 shown in FIG. 2 is discharged, the dry battery 23 in the dry battery bag 17
The camera 10 can be driven by. To explain this operation, the bag 17 containing the dry battery 23 is
As shown in the figure, the cover plate 15 may be opened and inserted into the grip 14. The grip 14 also serves as a battery holder, and when the bag 17 is inserted into it, it is introduced into the grip 14 as shown in FIG. When the case 18 is inserted against the coil spring 41 installed inside the grip 14, the protrusion 40 for preventing incorrect insertion provided inside the grip 14
As shown in FIG. 10, the slider 25 is engaged with the opening 24 of the case 18 and pushes the slider 25 which is vibably held within the opening 24. By this movement of the slider 25, two switches are switched. At the same time, when the dry battery bag 1γ is completely inserted into the grip 14, the terminal plate 26 provided on this bag 17
is the terminal board 42 provided in the inner part of the grip 14.
so that an electrical connection is achieved. When the dry battery bag 17 is inserted into the grip 14 and the switch 29 is opened, the constant voltage circuit shown in FIG. 8 is activated. This constant voltage circuit generates a voltage proportional to the output voltage generated at the output terminal 43 at the connection point between the resistor 38 and the variable resistor 39. The voltage generated at this connection point is then applied to the pulse width modulator 3.
6, the pulse width modulator 36 narrows the width of the pulse produced by the transistor 35 when the output voltage present at the output terminal 43 is low, thereby reducing the width of the pulse supplied to the output terminal 43. increase the amount of power used. If, on the other hand, the voltage present at the output terminal 43 is high, the pulse III modulator 36 increases the width of the pulse applied to the base of the transistor 35, so that the voltage applied to the output side is reduced. This produces a constant voltage at the output terminal 43. Note that the capacitor 37 is designed to absorb ripples. Therefore, according to such a video camera 10, when the camera 10 is used outdoors etc., the secondary battery pack 1
If the nickel-cadmium battery in 6 is discharged,
By removing this pack 16 and filling the dry battery pack 17 into the grip 14, the camera 1
It becomes possible to continue using 0. It has been confirmed that this video camera 10 can be operated continuously for 30 minutes with four alkaline dry batteries placed in the pack 17. Moreover, since the constant voltage circuit shown in FIG. 8 is built into this pack 17, it is possible to prevent the terminal voltage from dropping due to the load of the camera 10, and the normal battery 23 can be maintained until it is almost completely exhausted. It becomes possible to drive the video camera 10 with voltage. Therefore, without unnecessarily increasing the number of dry batteries 23,
It becomes possible to use it effectively to the maximum extent. Furthermore, a slider 25 is slidably held in the opening 24 in the case 18 of the dry battery pack 17, and only when the pack 17 is correctly installed is a protrusion 40 for preventing erroneous insertion. The active element 25 is moved and the switch 29 is closed. Therefore this pack 1
This not only prevents the battery 23 from discharging before attaching the pack 17 to the camera 10, but also prevents the switch 29 from closing if the pack 17 is attached to the grip 14 in the wrong position. At the same time, you will be notified that the insertion was incorrect. That is, if the case 18 is inserted in the wrong orientation, the protrusion 40 for preventing incorrect insertion comes into contact with the edge of the case 18, making it impossible to completely insert the case 18 and preventing the cover plate 15 from closing. . Moreover, according to such a video camera 10, since the video camera 10 can be driven by the dry battery pack 17, the secondary battery pack 17 is not necessarily required. Therefore, when purchasing the video camera 10, there is no need to purchase a secondary battery and a charging device for the secondary battery at the same time, thereby making it possible to reduce initial costs. Moreover, since the constant voltage circuit shown in FIG. 8 is incorporated into the dry battery pack 17, the cost of the video camera 10 itself is not increased.
When using only the secondary battery pack 16, there is no need to add an unnecessary constant voltage circuit to the camera 10, which increases the cost. Effects of the Invention] As described above, the present invention provides a case having almost the same shape as a case for storing a secondary battery, stores a dry battery in this case, and further includes at least a constant voltage circuit. The device is built into this case, and a case housing a dry battery is attached to an electronic device instead of a case housing a secondary battery, so that the electronic device can be driven by the dry battery. Therefore, according to the present invention, electronic devices that are normally powered by secondary batteries can be driven by dry batteries as needed, and the voltage drop can be prevented by the constant voltage circuit. It becomes possible.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing a dry battery pack for a video camera according to an embodiment of the present invention, Fig. 2 is an external perspective view of a video camera using this pack, and Fig. 3 is a dry battery pack with the door closed. Fig. 4 is a perspective view of the pack's appearance, Fig. 4 is a perspective view of the rear side, Fig. 5 is a vertical cross-sectional view of the pack, Fig. 6 is a cross-sectional view of the pack, and Fig. 7 is a diagram showing the horizontal side of the switch. Partially exploded perspective view, Figure 8 is a circuit diagram of a constant voltage circuit that works with the switch,
Figure 9 is a sectional view of the main parts showing the operation of attaching the pack, Figure 10
The figure is a sectional view showing a state in which the attachment is completed. In addition, in the symbols used in the drawings, 10...VTR built-in video camera 16...Secondary battery pack 17...Dry battery pack 18...Case 22...Dry cell storage space 23...Dry battery 28...Two circuit boards...Switches.

Claims (1)

[Claims] 1. In an electronic device driven by a secondary battery, a case having substantially the same shape as the case housing the secondary battery is provided, and the dry battery is housed within the case. In addition, at least a constant voltage circuit is built into this case, and a case containing this dry battery is attached to the electronic device instead of a case containing a secondary battery, and the electronic device is powered by the dry cell. 1. A power supply device for electronic equipment, characterized in that it is capable of driving. 2. The power supply device for electronic equipment according to claim 1, wherein the constant voltage circuit is activated only when the case containing the dry battery is attached to the electronic equipment. .