JPH05189092A - Power supply circuit for portable information processor - Google Patents

Abstract

(57) [Abstract] [Purpose] Internal independent power supply (battery) for portable information processing devices
To save space. [Structure] When it is detected that power is not supplied from the option box 2 even though the option box 2 as an external power source is mounted, a warning is displayed on the liquid crystal display 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a battery-powered portable information processing device.

[0002]

2. Description of the Related Art Due to recent technological advances, computers have become smaller and lighter, and portable information processing devices such as personal computers and word processors have been realized. With regard to workstations, miniaturization has progressed, and the size and weight suitable for carrying have been realized, and handy workstations that can be operated while being carried have appeared. This type of device is used for patrol work in stores and warehouses, and is useful for improving efficiency. As the display, a backlit liquid crystal display with good visibility is used,
A touch panel as a pointing device is attached to its front surface. These information processing devices such as a handy workstation have a built-in battery as an internal power source for carrying and using. When carried, the attached AC (AC) adapter is connected as an external power source to use a commercial AC power source. In the case of a battery, since the usage time is limited, it is devised to automatically switch to the AC power source when power is supplied from the AC adapter.

FIG. 27 shows a circuit configuration of a power supply circuit of this type of device.

The output voltage of each power supply is based on the NiCd battery 100.
1 is 4.8 (V), lithium battery 1003 is 3 (V),
The voltage of the AC adapter 1002 is 7 (V). Therefore, in the state where the portable computer is not connected to the AC adapter 1002, the voltage of the nickel cadmium battery 1001 is supplied to each circuit due to the voltage relationship, and the nickel cadmium battery 1001 and A
Lithium battery 1 when C adapter 1002 is not installed
The voltage of 003 is supplied to each circuit. Further, when the AC adapter 1002 is in the connected state, the AC adapter 100
A voltage of 2 is supplied to each circuit.

[0005]

However, when an abnormality occurs in the AC adapter, for example, the AC adapter 10
If the AC adapter 1002 is not connected to the AC outlet even if 02 is connected to the main body, or if AC power is not supplied to the AC outlet due to power failure, blown fuse, etc. even if connected to the AC outlet, the battery Since there is only a power supply, a battery is selected and the main body is driven by the battery. Therefore, the battery is consumed.

At this time, the operator is relieved that the AC adapter 1002 is connected to the main body, and does not particularly pay attention to the fact that the battery is driven, so that the battery will not run out during the work, or the user can carry it again. If it is used, the battery will be consumed unexpectedly and work will not be possible.

As described above, when a portable information processing device is driven by a battery, there is a demand for reduction of the power consumption of the device because the battery capacity is limited. Therefore, in view of the above points, an object of the present invention is to provide a power supply circuit of a portable information processing device capable of saving power consumption when driven by a battery.

[0008]

In order to achieve such an object, a first invention is to replace an internal power source with an internal power source instead of an external power source detachably connected to a portable information processing device. In a power supply circuit of a portable information processing device capable of supplying to the portable information processing device, first detecting means for detecting whether or not the external power supply is mechanically connected to the portable information processing device; A second detection means for detecting whether or not the power is supplied; and a detection result of the first detection means indicates a connection of the external power source, and the second
And a warning means for issuing a warning when the detection result of the detection means indicates that the power is not supplied.

According to a second aspect of the present invention, an attitude detecting means for detecting a tilt angle of the main body of the portable information processing device and a predetermined range of the tilt angle of the main body of the main body are set in advance. Judgment means for judging whether or not it is in an unused state by comparing the inclination angle detected by the posture detection means with the range of the predetermined inclination angle, and the result of the judgment is that the specific circuit is unused. And a control means for cutting off the power supply to the specific circuit while in the state.

[0010]

According to the first aspect of the invention, the warning is issued when the electrical connection abnormality of the external power supply in the use state (mechanically connected state) is detected, so that the operator can know the abnormality of the external power supply. You can do it and notice the consumption of internal power.

In the second invention, focusing on the fact that it is in an unused state depending on the inclination angle of the main body of the device like the display,
When the unused state of a specific circuit such as a backlight which consumes a large amount of power is detected by the tilt angle, the power supply to the specific circuit is cut off to save the power consumption.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the appearance of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a portable computer used as a handy terminal, which has a battery 4 built therein. An option box 2 receives an AC power source through the power plug 14 and supplies a DC (direct current) power source converted from AC-DC to the portable computer 1.

Numeral 5 is a chamfer for guides provided at both ends of the portable computer 1, and is mounted in the direction of arrow 7 along guides 6 provided at both ends of the option box 2. Reference numeral 8 is a female power supply connector that receives power from the option box 2, and 9 is a male power supply connector that is connected to the female power supply connector 8 and supplies power to the portable computer 1.

Reference numeral 101 designates a main body 1 in an option box 2.
The photo interrupter that detects whether the
Reference numeral 2 denotes a protrusion that turns on / off the photo interrupter 101, and the protrusion 102 is inserted into the photo interrupter 101 by mounting the main body 1 on the option box 2.

Reference numerals 10 and 11 denote optical communication ports each of which is provided in the portable computer 1 and the option box 2 and each of which includes a plurality of light-receiving and light-emitting elements. Information stored in the portable computer 1 is transferred via a communication cable 12. And transmits it to the host computer 3. Alternatively, the information from the host computer 3 is transmitted to the portable computer.

Reference numeral 13 denotes a touch panel, which is a pressure-sensitive coordinate input device that operates as an input means of the portable computer 1, and a liquid crystal display device. Reference numeral 15 is an LED (light emitting element) lamp for displaying the mounting state of the system.

(Mounting state of the portable computer 1) FIG. 2
Shows a state in which the portable computer 1 is attached to the option box 2 of FIG.

In this state, power is supplied from the male power supply connector 9 of the option box 2 to the rechargeable battery of the portable computer 1 and the power supply section, so that the rechargeable battery can be used while using the portable computer 1. 4 can be charged. Further, the optical communication ports 10 and 11 are arranged at positions facing each other, and information can be transmitted by optical communication.

FIG. 3 is a view of the portable computer 1 viewed from the direction of the arrow 16 shown in FIG. 1, and the battery 4 is attached from the direction shown by the arrow 17. Therefore, in the mounted state as shown in FIG. 2, the battery 4 cannot be removed from the portable computer 1, and an accident such as accidentally removing the battery during operation can be prevented.

(Connection of Power Supply Connector 9) FIG.
FIG. 5 is a perspective view showing details of the male power supply connector 9 of FIG. 5, and FIG. 5 is a diagram illustrating a connection process of the male power supply connector 9 and the female power supply connector 8.

In FIGS. 4 and 5, 18 is each terminal 19
A case member formed by molding for fixing B, 20B, 21B, and 22B. The case member is formed in a comb shape and is configured to fit in the groove portion of the female power supply connector 8.

As shown in FIG. 5, the case member 18 is placed on a pedestal 23 fixed to the option box 2,
By the fixing member 24, elastic members 25a, 2 such as sponge
It is fixed via 5b and is rotatable in the direction shown by arrow 27 about the pivot portion 26.

Therefore, even if the portable computer 1 is obliquely inserted into the option box 2, the comb teeth formed on the case member 18 can be fitted smoothly into the groove of the female power supply connector 8. ..

Further, by fitting the male power supply connector 9 and the female power supply connector 8, the respective light emission and light receiving elements 10a to 10h and 11a to 11 of the optical communication ports 10 and 11 are connected.
The h and h are correctly positioned at the opposite positions.

(Details of Power Supply Connectors 8 and 9) FIG.
FIG. 7 is a diagram showing details of each terminal portion of the female power supply connector 8 and the male power supply connector 9.

In FIGS. 6 and 7, 19A and 19B are
Portable computer 1 and option box 2, respectively
GND terminals, 20A and 20B are charging terminals for rechargeable batteries, 21A and 21B are power supply terminals, and 22A and 22B are output control terminals.

Further, in FIG. 7, the heights L1, L2, L3 from the bottom surface of each terminal are constructed in the relationship of L1>L2> L3, and as shown in FIG. 5, the portable computer is indicated by an arrow 28. When installed in the direction, each terminal is 19A 19
B, 20A 20B, 21A 21B, 22A 22B are connected in this order, and the charging terminals 20A, 20B and the power supply terminals 21A, 2 are controlled by signals from the control terminals 22A, 22B.
Power supply to 1B is started.

(Explanation of Circuit of Portable Computer 1) FIG.
Shows a circuit configuration of the portable computer 1.

Reference numeral 81 denotes a central processing unit (CPU) for performing overall control, for example, management of memory 82, control of liquid crystal display (LCD) / touch panel, control of optical communication port 10, option box relating to the present invention. Two
Displays the (AC adapter) error. Reference numeral 82 denotes a memory that is a storage device, and includes a 1 MB (megabyte) ROM (read only memory) and a 1.25 MB SRAM (static RAM). Further, the SRAM is backed up by a lithium battery when the NiCd battery, which is the main power source, is discharged or removed by a method described later.

Reference numeral 83 denotes a liquid crystal display device (LCD), a touch panel and a driving device. The liquid crystal display device is a backlit LCD and has a resolution of 640 × 480 dots. The touch panel, which is a pressure-sensitive image input device, is an analog type, and the positions of keys can be freely set.

Reference numeral 84 is an optical communication interface (I / F)
The RS-232C signal sent from the CPU 81 is converted into an optical communication signal by the method described later, and the optical communication port 1
Output from 0.

Reference numeral 85 denotes a power supply circuit which controls the DC voltage supplied from the power supply connector 86 and the NiCd battery charging voltage to supply power to the portable computer 1 and charge the NiCd battery by the method described later. .. Also, as described above, switching is performed between the nickel cadmium battery and the lithium battery. Then, by a method described later, it is detected that the supply voltage from the AC adapter (option box 2) is abnormal and the CPU 81 is notified.

The female power supply connector 8 sends the DC voltage and the battery charging voltage supplied from the option box 2 to the power supply circuit 85. 87 is a charger connector for charging the NiCd battery from the outside. 88 is
It is a rechargeable NiCd battery that is the main power source of a portable computer.

A voltage of 4.8 V is obtained by combining four 1.2 V batteries per cell. 89
Is a 3V lithium battery for memory backup described above. As described above, the photo interrupter 101 detects whether the main body 1 is attached to the option box 2.

(Explanation of Power Supply Circuit) FIG. 9 shows a power supply circuit 85.
3 is a diagram showing an internal equivalent circuit of FIG.

The output voltage of each power source is 4.8V for the NiCd battery 88, 3V for the Lithium battery, 6V for the NiCd battery charging voltage (CHG), and 7V for the AC adapter voltage (DCI). Therefore, when the portable computer 1 is not connected to the option box 2, the voltage of the nickel cadmium battery 88 is supplied to each circuit by the diode shown in the figure due to the voltage relationship, and when the nickel cadmium battery is not installed, the lithium battery 89 is used.
Is supplied to each circuit.

When the option box 2 is connected, the AC adapter voltage (DCI) is supplied to each circuit, and the NiCd battery is charged by the NiCd battery charging voltage (CHG). The voltage detection circuit 103 divides the voltage supplied to each circuit with the photo interrupter 101 that outputs “L” (0V) when the main body 1 is inserted in the option box 2 by a resistor so that each voltage is 7V. It is composed of a circuit that outputs H "(5V) and an OR (OR) gate. When the main body 1 is in the option box 2 and the AC adapter voltage (DCI) 7V is not supplied, the signal" L "(0V) Is output to the CPU 81.

FIG. 10 shows a power supply circuit 8 for detecting the circuit supply voltage.
5 shows an operation sequence of No. 5.

Whether the main body 1 is inserted in the option box 2 is detected by the detection signal from the photo interrupter 101 (S1). If the voltage supplied to each circuit is 7V when the option box 2 is in the inserted state, the drive by the AC adapter is started according to the voltage relationship of the above method (S2 →
S3).

On the other hand, when the option box 2 is inserted and the 7V voltage is not supplied from the option box 2, the voltage detection circuit 103 outputs an abnormal signal of "L".
The display control for warning display of "AC adapter connection error" is executed on the display screen of. Further, next, the warning display control of "currently driving the battery" (see FIG. 11) is performed (S1 → S
2 → S2A → S2B).

In this case, when the nickel-cadmium battery 88 is attached, power is supplied from the nickel-cadmium battery 88 due to the potential difference (S4 → S5), and in the opposite case, the lithium battery 89.
Power is supplied from (S4 → S6).

If the option box 2 is not installed, the CPU 81 detects the battery drive by the AC adapter presence / absence signal (output of the photo interrupter 101) (negative determination of S1 in FIG. 10) and "the battery is being driven." A warning display of only "is displayed as shown in FIG. 11 (S1 → S2
B).

As described above, in the first embodiment, when the battery is driven, a message to that effect is displayed, and when the battery is driven even though the option box 2 is only installed, the AC adapter has a malfunction. A warning is displayed. Therefore, the operator can execute power supply from the option box 2 by inspecting the option box 2 and prevent waste of the battery.

(Description of Option Box 2) FIG. 12
Shows the circuit configuration of the option box 2. In FIG. 12, reference numeral 91 is a rectifying / smoothing circuit mainly composed of a transformer and a capacitor for converting from AC100V to DC20V. Reference numeral 94 denotes a switching stabilization circuit, which is sent from the rectifying / smoothing circuit 91.
V is converted to 7V and 5V and stabilized.

Reference numeral 95 is a constant current circuit used to charge the NiCd battery, and the output is 130 regardless of load fluctuation.
It is a charging circuit with mA. 93 receives the 5V from the stabilizing circuit 94 and sends the signal from the optical communication connector to RS-23.
It is a communication circuit for mutually converting into a 2C signal (or vice versa) and outputting the same, and has an optical communication circuit, which will be described later, the same as the portable computer device.

In 97, the stabilizing circuit and the charging circuit are turned on / on.
It is a detection circuit that detects that it is turned off and informs the communication circuit 93. A control circuit 92 turns on / off the outputs of the stabilizing circuit 94 and the charging circuit 95 according to the output control signal (DET). Reference numeral 9 is a male power supply connector that is connected to the main body.

(Description of Output Control Signal DET) The output control signal (DET) placed on the male power supply connector 9 is
The control circuit 92 is turned off by fitting the output control signal (DET), which is placed on the female power supply connector 8 and connected to the GND terminal, to supply power to the stabilizing circuit 94 and the charging circuit 95. Further, by stopping the fitting, the control circuit 92 is turned off and the power supply is stopped.

(Structure of Optical Communication Circuit) FIG. 13 is a diagram showing an equivalent circuit of the optical communication ports 10 and 11 arranged at positions facing each other. The RS-232C of the portable computer 1 or the option box 2 is shown. Communication is performed by converting signals into optical signals. Optical communication port 1 in this embodiment
Phototransistors are used for 0 and 11, and the light emitting portion and the light receiving portion are arranged at positions facing each other, and the light emitting portion and the light receiving portion are alternately arranged in order to prevent interference of optical signals. Then, communication is performed at 19200 BPS by the start-stop synchronization method.

When receiving a signal from the power on / off detection circuit 97, the light emitting portions 11a, 11 of the optical communication port 11 are also received.
All of c, 11e, and 11g are turned on. Then, the portable computer 1 which has received the light by the light receiving portions 10a, 10c, 10e, 10g of the optical communication port 10 has the light emitting portions 10b, 10g.
All of d, 10f, and 10h are turned on. The option box 2 received by the light receiving portions 11b, 11d, 11f, 11h of the communication port 11 turns on the LED lamp 15 because it is determined that the option box 2 is completely attached. Thus, RS-
By performing a series of optical communication that is not in the communication protocol of 232C, it is confirmed that the mutual optical communication ports are in the communication state, and when the series of optical communication is not finished,
Incomplete mounting is shown.

<Application of First Embodiment> FIG. 14
The external appearance of another embodiment to which the present invention is applied is shown in FIG.

In FIG. 14, the main body 200 is the same as that of the above-mentioned embodiment, and is provided with a display 201 with a touch panel. Reference numeral 202 denotes an AC adapter connector into which a connection plug 204 of the AC adapter 203 is inserted. The AC adapter 203 has a power plug 2
05 is provided and used by inserting it into an AC outlet. In the state of FIG. 14, the connection plug 204 is inserted, but the power plug 205 is not plugged into the outlet and there is no power supply from the AC power source, so a warning is displayed on the display 201.

The structure for detecting the connection of the connection plug 204 of FIG. 14 will be described with reference to FIG. Note that FIG. 15 is a cross-sectional configuration diagram.

An electrode 205 and an electrode 206 are provided on the connection plug 204. Correspondingly to this, an electrode 207 and an electrode 208 are provided on the main body side, and power is supplied when these electrodes come into contact with each other.

Reference numeral 209 denotes a light-shielding plate, which is rotatably attached to the fulcrum 210 and has an arrow 2 by a spring (not shown).
It is biased in the direction of 11. Reference numeral 212 denotes a photo interrupter, which emits an AC adapter connection detection signal when shielded by the light blocking plate 209. When the connection plug 204 is not inserted, the light blocking plate 209 is at the position (a), and the photo interrupter 212 is not shielded from light.
In the insertion process, the electrode 205 moves the light blocking plate 209, and the photo interrupter 212 is shielded from light, so that the connection of the connection plug 204 is detected. In this way, the connection of the AC adapter 203 can be detected, and the power supply from the AC adapter can be detected as in the embodiment.
When 03 is connected and the power is not supplied from the AC adapter 203, a warning display "AC adapter connection error"
Is done.

(Second Embodiment) An external view of the second embodiment is shown in FIG.
Shown in.

In FIG. 16, reference numeral 501 denotes a main body case of the handy terminal, which is configured to accommodate each component and to be easily held in the hand. A display 502 displays characters and images. Reference numeral 503 denotes a power switch, which is located slightly behind the surface of the main body case 1 and is prevented from being accidentally pressed.

Reference numeral 504 denotes a strap, which is made of a material such as cloth or rubber, and is used to hang it on the shoulder when carrying the apparatus. An attitude detection sensor 505 according to the present invention emits a detection signal indicating an attitude state according to the attitude of the main body.

FIG. 17 is a sectional view of the display 2.

In FIG. 17, a touch panel 506 emits a signal indicating the coordinate position pressed by the operator's finger. Reference numeral 507 is a liquid crystal case, 508 is a liquid crystal unit, 509 is a backlight fluorescent tube, and 511 is a reflecting plate for diffusing and reflecting the light of the fluorescent tube.

Further, 512 and 513 are packings provided between the touch panel 506 and the liquid crystal case 507.

FIG. 18 shows the posture detection sensor 505 of FIG.
Shows the structure of.

In FIG. 18, 514 is a light shielding plate,
It is attached rotatably around the support shaft 515. 51
Reference numeral 6 denotes a photo interrupter in which a light emitting portion and a light receiving portion are paired, and emits an ON signal when the light shielding plate 514 shields the light and an OFF signal when the light shielding plate 514 retracts. The light interrupting plate 514 for the photo interrupter 516
Is at the position (a) shown by a solid line in the figure when the display surface is horizontal, and is shown by a two-dot chain line in the figure when the display surface is vertical with the power switch 503 side downward. In the position.

Further, the relationship between the position of the attitude detection sensor and the attitude of the apparatus will be described in detail.

FIG. 19 shows the relationship when the apparatus main body is horizontal.

The photo interrupter 516 is a light blocking plate 51.
The light is shielded by 4, and the detection signal is on.

FIG. 20 shows the relationship in the case where the main body of the apparatus is facing downward, in which the light shielding plate 514 is removed from the photo interrupter 516 and the detection signal is turned off.

FIG. 21 shows the relationship when the main body is facing upward, and the detection signal is ON.

As described above, since the shading plate 514 maintains its posture due to gravity, the shading plate 5 is changed depending on the posture of the apparatus body.
14, the positional relationship between the photo interrupter 516 and
The posture of the device body is detected. In this embodiment, the signal is O
As shown in FIG. 22, the range of N is set from 135 ° when the main body of the apparatus rotates upward from the horizontal to 45 ° downward.

FIG. 23 shows a circuit configuration of the second embodiment.

In FIG. 23, CPU 510 drives application software according to an input signal from touch panel 506 and instructs liquid crystal driver 520 to form an image on liquid crystal display 508.

The CPU 510 also controls the inverter 521 to turn on the backlight 509. ON or OF from the photo interrupter 516 to the CPU 510
The F signal is sent. The CPU 510 turns on the backlight 509 only when ON is sent.

A battery 522 is a power source. Reference numeral 523 denotes a stabilizing circuit for making the voltage supplied from the battery 522 constant and supplying the voltage to each unit. Power supply to each unit is controlled by a power switch 503.

The CPU 510 validates the input signal from the touch panel 6 only when the signal from the photo interrupter 516 is ON, and invalidates it when it is OFF.

The operation of the second embodiment constructed as above will be described.

First, when the power switch 503 is operated, power is supplied from the battery 522 to each part. As a result, C
The PU 510 interruptively executes the processing procedure of FIG. 24 at regular time intervals, determines the level of the signal of the photo interrupter 516 (S500), and controls the backlight lighting (S51).
0, S520) is started. That is, if the signal of the photo interrupter 516 is ON (YES determination in S500 of FIG. 24), the CPU 510 causes the inverter 521 to operate.
Is controlled (S510 in FIG. 24) and the backlight 509 is controlled.
Lights up and remains lit. For example, when the main body is placed on a desk, the state shown in FIG. 19 is entered, so that the signal of the photo interrupter 516 is turned on and the backlight 509 is turned on.

When the main body is used upright, that is, in FIG.
Since the state shown in 1 is reached, the signal of the photo interrupter 516 is turned on and the backlight 509 is turned on. When it is used upright, as shown in FIG. 22, it is on the opposite side of the vertical, that is, on the side where the liquid crystal display 502 is on the back side.
There is a margin of °, and the signal is not turned on or off even when the shading plate 514 is slightly shaken due to vibration or the like.

In the case of carrying around, which is a feature of the handheld device, the strap 504 is held around the neck to support the main body with one hand, and the touch panel 506 is operated with one hand while maintaining the state of FIG. At this time, the signal of the photo interrupter 516 is ON, and the backlight 509 is on.

Then, when the work is interrupted such as moving the luggage or moving it to another place, the hands supporting the main body are released and the strap 504 hangs it to an unused state as shown in FIG. .. At this time, the signal of the photo interrupter 516 is turned OFF (NO determination in S500 of FIG. 24), the inverter 521 is controlled by the CPU 510 (S520 of FIG. 24), and the backlight 509 is turned off.

Then, in order to perform the operation, the main body is again lifted by hand, and when the state shown in FIG. 19 is reached, the photo interrupter 5
16 is turned on and the backlight 509 is turned on. Since the image is formed on the liquid crystal as it is, the image is clearly displayed by the light of the backlight 509.

When the user releases the hand and does another work, that is, in the unused state of FIG. 10, the photo interrupter 516 is OFF, so the CPU 510 invalidates the input signal from the touch panel 506. Therefore, erroneous input such as touching the touch panel by mistake is prevented.

As described above, when the main body is in the posture for operating, the backlight is turned on, and when it is not in the posture, the backlight is turned off, so that efficient power saving can be automatically performed.

(Application example to the second embodiment) (1) In the description of the second embodiment, the detection angle with respect to the posture of the main body is set from 45 ° below the horizontal to 135 ° above the horizontal, but it differs depending on the application. Alternatively, if the position of the photo interrupter 516 can be moved, for example, the target angle can be set.

(2) If the device is supposed to be used with the display upside down, it is advisable to provide a mode in which the meaning of ON / OFF of the detection sensor is reversed. The mode may be automatically changed according to the upside down setting.

(3) Further, if control is made so that the detection signal becomes valid after several seconds have passed since the detection signal was received,
When the detection signal is momentarily transmitted due to vibration or the like, it is possible to invalidate the minute vibration, so that switching is not performed more than necessary and the operator does not feel uncomfortable.

Further, it is possible to prolong the life of a light emitting device such as a fluorescent tube for a backlight or an EL, which has a limited number of ON / OFF switching times.

(4) Further, when the power is turned on, if the backlight is turned on for a certain time regardless of the detection signal, that is, regardless of the posture of the main body, the power on can be indicated by the brightness of the display.

(5) In addition, by providing a mode for canceling the automatic backlight control according to the detection signal of the attitude detection sensor and instructing the cancellation mode from the keyboard, the apparatus main body can be used even in an unnatural attitude. can do.

(6) Another example of the configuration of the attitude detection sensor is shown in FIG.
5 shows. In the figure, 601 is a light-shielding plate, and the fan-shaped angle is set to 90 °. The photo interrupter 616 is
The knob 602 is attached to the knob 602, and the knob 602 is assembled so as to be movable along the rail 603. The operator can operate the knob 602 as necessary to adjust the position of the photo interrupter 616. If the fan-shaped angle of the light shielding plate 601 is narrowed, the ON range can be limited, and more positive power saving can be expected. Since the posture of the main body that is turned on can be adjusted by operating the knob 602, it is possible to respond according to the usage environment.

(7) Further, a mercury switch may be used instead of the attitude detection by the light shield plate and the photo interrupter. FIG. 26 shows an example of a mercury switch. Case 70
4 contains mercury 705, electrodes 706, 707 are provided and the mercury switch is in state A, electrode 7
06 and 707 are conducted by mercury 705, and the state B
Then there is no continuity. By keeping the mercury horizontal in this way, conduction is switched depending on the posture of the case 704. A desired detection angle can be obtained by changing the amount of mercury or the arrangement of electrodes.

[0091]

As described above, according to the first aspect of the present invention, when the external power source, for example, the AC adapter is improperly mounted, a warning is issued, so that the operator can immediately check the external power source and waste the internal power source. It is possible to prevent unnecessary waste.

According to the second aspect of the present invention, a circuit which is not in use is automatically detected and the power supply to the circuit is cut off, so that the power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a first embodiment.

FIG. 2 is a perspective view showing the appearance of the first embodiment.

FIG. 3 is a perspective view showing an appearance of the first embodiment.

FIG. 4 is a perspective view showing the structure of the male power supply connector 9 of FIG.

5 is a cross-sectional view showing a connection process of the male power supply connector 9 of FIG.

6 is a side sectional view showing details of a terminal portion of the female power supply connector 8 of FIG.

7 is a side sectional view showing details of a terminal portion of the male power supply connector 9 of FIG.

FIG. 8 is a block diagram showing a circuit configuration of the portable handy terminal according to the first embodiment.

9 is a circuit diagram showing a circuit configuration of a power supply circuit 85 of FIG.

FIG. 10 is a flowchart showing a sequence of a power supply operation of the first embodiment.

FIG. 11 is a perspective view showing display contents of the first embodiment.

FIG. 12 is a block diagram showing a circuit configuration of an option box 2 of the first embodiment.

13 is a circuit diagram showing a circuit configuration of the optical communication ports 10 and 11 of FIG.

FIG. 14 is a perspective view showing another form of the first embodiment.

15 is a cross-sectional view showing a mounted state of the connection plug 204 of FIG.

FIG. 16 is a perspective view showing the outer appearance of the second embodiment.

FIG. 17 is a cross-sectional view showing the structure of the display 20 of the second embodiment.

18 is a front view showing the structure of the posture detection sensor 505 of FIG.

FIG. 19 is an explanatory diagram showing the relationship between the tilted (posture) state of the apparatus body of the second embodiment and the detection angle of the posture detection sensor 505.

FIG. 20 is an explanatory diagram showing the relationship between the tilted (posture) state of the apparatus main body of the second embodiment and the detection angle of the posture detection sensor 505.

FIG. 21 is an explanatory diagram showing the relationship between the tilted (posture) state of the apparatus body of the second embodiment and the detection angle of the posture detection sensor 505.

FIG. 22 is an explanatory diagram showing a detection range of a posture detection sensor 505 according to the second embodiment.

FIG. 23 is a block diagram showing a circuit configuration of a second embodiment.

FIG. 24 is a flowchart showing a backlight control procedure of the CPU 510 in FIG. 23.

FIG. 25 is a cross-sectional view showing another structure of the attitude detection sensor of the second embodiment.

FIG. 26 is a cross-sectional view showing another structure of the attitude detection sensor of the second embodiment.

FIG. 27 is a block diagram showing a circuit configuration of a conventional power supply circuit.

[Explanation of symbols]

1 Portable Computer (Handy Terminal) 2 Option Box 3 Host Computer 4 Battery 8 Female Power Supply Connector 9 Male Power Supply Connector 13 Touch Panel (Liquid Crystal Display) 14 Power Plug 17 Attachment Direction of Portable Computer 1 to Option Box 2 19A Female GND terminal 19B Male GND terminal 20A Female charging terminal 20B Male charging terminal 21A Female power terminal 21B Male power terminal 22A Female output control terminal 22B Male output control terminal 101 Photo interrupter 102 Projection 501 Main body case 502 Display 504 Strap 505 Posture detection sensor 506 Touch panel 514 Light shield 516 Photo interrupter 601 Light shield 602 Knob 603 Rail

Claims (2)

[Claims] 1. A power supply circuit of a portable information processing device capable of supplying power from an external power supply detachably connected to the portable information processing device to an internal circuit instead of the internal power supply, wherein the external power supply is provided. A first detecting means for detecting whether or not the power is mechanically connected to the portable information processing device; a second detecting means for detecting whether or not the power is supplied from the external power source; 1 warning means for issuing a warning when the detection result of the detection means indicates the connection of the external power source and the detection result of the second detection means indicates that the power is not supplied. Power supply circuit for portable information processing device. 2. A posture detecting means for detecting a tilt angle of a main body of a portable information processing device, and a predetermined range of the tilt angle of the main body of the main body, wherein the specific circuit of the main body is in an unused state. A determination unit that determines whether or not there is an inclination angle detected by the attitude detection unit and a range of the determined inclination angle, and the determination result indicates that the specific circuit is in an unused state. A power supply circuit for a portable information processing device, comprising: a control means for shutting off power supply to the specific circuit while the power supply is on.